WO2019080305A1

WO2019080305A1 - Display system and current driving method thereof

Info

Publication number: WO2019080305A1
Application number: PCT/CN2017/116293
Authority: WO
Inventors: 单剑锋
Original assignee: 惠科股份有限公司
Priority date: 2017-10-26
Filing date: 2017-12-14
Publication date: 2019-05-02
Also published as: CN107731173A

Abstract

A display system and a current driving method thereof. The method comprises: calculating a total lighting time of a corresponding light emitting source by a timer, and converting the total lighting time of the light emitting source into a numerical reference value (410); converting the numerical reference value into a first electrical parameter (420); measuring a second electrical parameter of an operating driving current of the corresponding light emitting source (430); comparing the first electrical parameter with the second electrical parameter (440); determining whether the first electrical parameter is different from the measured second electrical parameter (450); if yes, adjusting the operating driving current of the light emitting source (460); and if not, ending the procedure.

Description

显示***及其电流驱动方法技术领域 Display system and current driving method thereof

[0001] 本申请涉及显示技术领域，尤其涉及一种显示***及其电流驱动方法。 [0001] The present application relates to the field of display technologies, and in particular, to a display system and a current driving method thereof.

背景技术 Background technique

[0002] 通常，液晶显示器（LCD)组件应用在各种用途，例如笔记本型计算机，移动电话，个人数字助理，汽车仪表板等。典型而言，发光光源位于 LCD组件中光调制器，例如液晶层后面以利于观看影像及产生最佳发光效果。发光光源可以是荧光灯，电致发光组件，发光二极管（LED) , 气态放电灯等。一般控制电路提供整流过的电流给发光光源。 [0002] In general, liquid crystal display (LCD) components are used in a variety of applications, such as notebook computers, mobile phones, personal digital assistants, car dashboards, and the like. Typically, the illuminating source is located in the LCD module, such as behind a liquid crystal layer, to facilitate viewing of the image and to produce an optimum illuminating effect. The illuminating light source can be a fluorescent lamp, an electroluminescent component, a light emitting diode (LED), a gaseous discharge lamp, or the like. The general control circuit provides a rectified current to the illuminating source.

[0003] 请参阅图 1，发光光源模块 104可以位于 LCD组件中的光调制器后面。发光光源模块 104包括串联的发光二极管（LED)。 LED电流控制综合电路（亦称为控制器 ) 102控制发光光源模块 104的驱动电流。控制器 102的输出端 DRV经由 RC滤波器 106连接至晶体管 108的基极。晶体管 108的集电极经连接器负荷电阻 110连接至电源装置 Vcc。晶体管 108的射极接地。晶体管 108的集电极进一步经二极管 112 连接至发光光源模块 104。发光光源模块 104的输出端经偏置电阻 114接地。发光光源模块 104的输出端还连接至控制器 102的端 FB。电容器 116使电源装置 Vcc接地。另一电容器 118使二极管 112接地。 Referring to FIG. 1, the illuminating light source module 104 may be located behind the light modulator in the LCD assembly. The illuminating light source module 104 includes a series of light emitting diodes (LEDs). An LED current control integrated circuit (also referred to as a controller) 102 controls the drive current of the light source module 104. The output DRV of the controller 102 is coupled to the base of the transistor 108 via an RC filter 106. The collector of transistor 108 is coupled to power supply unit Vcc via connector load resistor 110. The emitter of transistor 108 is grounded. The collector of transistor 108 is further coupled to illuminating light source module 104 via diode 112. The output of the illuminating light source module 104 is grounded via a bias resistor 114. The output of the illuminating light source module 104 is also coupled to the terminal FB of the controller 102. Capacitor 116 grounds power supply unit Vcc. Another capacitor 118 grounds diode 112.

[0004] 在另一常规电流调节器 100中，偏置电阻器 114决定可以流经发光光源模块 104 的驱动电流值。控制器 102经由 RC滤波器 106输出固定的启动信号至晶体管 108的基极。晶体管 108提供给发光光源模块 104预定驱动电流。典型而言，一旦偏置电阻器 114的电阻值建立，则经过发光光源模块 104的驱动电流即无法调整。发光光源模块 104的 LED亮度与流经发光光源模块 104的驱动电流成正比。长期使用电路组件可能造成发光光源模块 104的驱动电流不可预期的变化。此外，某些种类 LED, 例如有机 LED(OLED)内的驱动电流可能因为电流调节器 100的操作温度改变而发生变化。结果，可能不利于发光光源模块 104内 LED的亮度。因此，需要一种控制 LCD***内发光光源模块的驱动电流的方法及装置。技术问题 In another conventional current regulator 100, the bias resistor 114 determines a drive current value that can flow through the illuminating light source module 104. Controller 102 outputs a fixed enable signal to the base of transistor 108 via RC filter 106. Transistor 108 provides a predetermined drive current to illuminating light source module 104. Typically, once the resistance value of the bias resistor 114 is established, the drive current through the illumination source module 104 cannot be adjusted. The LED brightness of the illuminating light source module 104 is proportional to the driving current flowing through the illuminating light source module 104. Long-term use of the circuit components may cause unpredictable changes in the drive current of the illuminating light source module 104. In addition, drive currents in certain types of LEDs, such as organic LEDs (OLEDs), may change due to changes in the operating temperature of current regulator 100. As a result, the brightness of the LEDs within the illuminating light source module 104 may be detrimental. Therefore, there is a need for a method and apparatus for controlling the drive current of an illumination source module within an LCD system. technical problem

[0005] 鉴于上述问题，本申请提供了依据不同使用条件来控制液晶显示***内发光光源的工作驱动电流的显示***及其电流驱动方法。 In view of the above problems, the present application provides a display system for controlling a working drive current of a light source in a liquid crystal display system according to different use conditions, and a current driving method thereof.

问题的解决方案 Problem solution

技术解决方案 Technical solution

[0006] 一方面，本申请实施例提供了一种显示***，包括：显示装置，具有至少一发光光源；以及电流控制器，连接所述至少一发光光源，所述电流控制器包括：计吋器，计算所述至少一发光光源的总点亮吋间；存储装置，连接所述计吋器，被配置为存储分别对应不同总点亮吋间的多个数字参考值，其中每个数字参考值对应所述至少一发光光源的预定驱动电流；数模转换器，连接于所述存储装置及用以转换所述至少一发光光源的总点亮吋间的数字参考值成第一电参数；比较器，连接于所述数模转换器并用以比较所述第一电参数与对应所述至少一发光光源的工作驱动电流的第二电参数，并产生驱动偏置电流；及电流调节器，连接所述比较器及根据所述驱动偏置电流调整所述至少一发光光源的工作驱动电流，其中所述驱动偏置电流对应所述第一电参数及所述第二电参数之间的差值。 In one aspect, an embodiment of the present application provides a display system, including: a display device having at least one illuminating light source; and a current controller connecting the at least one illuminating light source, the current controller comprising: Calculating a total lighting time of the at least one illuminating light source; storing means for connecting the meter, configured to store a plurality of digital reference values respectively corresponding to different total lighting turns, wherein each digital reference The value corresponds to a predetermined driving current of the at least one illuminating light source; the digital-to-analog converter is connected to the storage device and the digital reference value for converting the total lighting time of the at least one illuminating light source into a first electrical parameter; a comparator connected to the digital-to-analog converter and configured to compare the first electrical parameter with a second electrical parameter corresponding to a working drive current of the at least one illuminating light source, and generate a driving bias current; and a current regulator, Connecting the comparator and adjusting a working drive current of the at least one illuminating light source according to the driving bias current, wherein the driving bias current Should the difference between the first electrical parameter and the second electrical parameter.

[0007] 另一方面，本申请实施例提供了一种显示***的电流驱动方法，包括：计算对应所述至少一发光光源的总点亮吋间的计吋器，并转换所述至少一发光光源的总点亮吋间为数字参考值，其中所述数字参考值对应至少一发光光源的预定驱动电流；转换所述数字参考值成第一电参数；测量对应所述至少一发光光源的工作驱动电流的第二电参数；比较所述第一电参数与所述第二电参数，并根据比较结果产生驱动偏置电流；及根据所述驱动偏置电流调整所述至少一发光光源的工作驱动电流。 On the other hand, an embodiment of the present application provides a current driving method for a display system, including: calculating a meter corresponding to a total lighting time of the at least one light source, and converting the at least one light The total lighting time of the light source is a digital reference value, wherein the digital reference value corresponds to a predetermined driving current of the at least one illuminating light source; converting the digital reference value into a first electrical parameter; and measuring the work corresponding to the at least one illuminating light source a second electrical parameter of the driving current; comparing the first electrical parameter with the second electrical parameter, and generating a driving bias current according to the comparison result; and adjusting the operation of the at least one illuminating light source according to the driving bias current Drive current.

[0008] 又一方面，本申请实施例提供了一种显示***，包括：显示装置，具有至少一发光光源；以及电流控制器，连接所述至少一发光光源，所述电流控制器包括：环境光感测器，感测所述显示装置前方的环境亮度；存储装置，连接所述环境光感测器，被配置为存储分别对应不同环境亮度的多个数字参考值，其中每个数字参考值对应所述至少一发光光源的预定驱动电流；数模转换器，连接于所述存储装置及用以转换所述显示装置前方的环境亮度的数字参考值成第一电参数；比较器，连接于所述数模转换器并用以比较所述第一电参数与对应所述至少一发光光源的工作驱动电流的第二电参数，并产生驱动偏置电流；及电流调节器，连接所述比较器及根据所述驱动偏置电流调整所述至少一发光光源的工作驱动电流，其中所述驱动偏置电流对应所述第一电参数及所述第二电参数之间的差值。 In another aspect, an embodiment of the present disclosure provides a display system, including: a display device having at least one illuminating light source; and a current controller connecting the at least one illuminating light source, wherein the current controller comprises: an environment a light sensor that senses ambient brightness in front of the display device; a storage device coupled to the ambient light sensor, configured to store a plurality of digital reference values respectively corresponding to different ambient brightness, wherein each digital reference value Corresponding to a predetermined driving current of the at least one illuminating light source; a digital to analog converter connected to The storage device and the digital reference value for converting the ambient brightness in front of the display device into a first electrical parameter; a comparator connected to the digital-to-analog converter and configured to compare the first electrical parameter with the corresponding a second electrical parameter of the operating drive current of the at least one illuminating light source, and generating a driving bias current; and a current regulator connected to the comparator and adjusting a working driving current of the at least one illuminating light source according to the driving bias current The driving bias current corresponds to a difference between the first electrical parameter and the second electrical parameter.

[0009] 又一方面，本申请实施例提供了一种显示***的电流驱动方法，包括：计算对应显示装置前方的环境亮度的环境光感测器，并转换所述环境亮度为数字参考值，其中所述数字参考值对应至少一发光光源的预定驱动电流；转换所述数字参考值成第一电参数；测量对应所述至少一发光光源的工作驱动电流的第二电参数；比较所述第一电参数与所述第二电参数，并根据比较结果产生驱动偏置电流；及根据驱动偏置电流调整所述至少一发光光源的工作驱动电流。 In another aspect, an embodiment of the present application provides a current driving method for a display system, including: calculating an ambient light sensor corresponding to an ambient brightness in front of a display device, and converting the ambient brightness to a digital reference value, The digital reference value corresponds to a predetermined driving current of the at least one illuminating light source; converting the digital reference value into a first electrical parameter; measuring a second electrical parameter corresponding to the working driving current of the at least one illuminating light source; comparing the first An electrical parameter and the second electrical parameter, and generating a driving bias current according to the comparison result; and adjusting a working driving current of the at least one illuminating light source according to the driving bias current.

[0010] 又一方面，本申请实施例提供了一种显示***，包括：显示装置，具有至少一发光光源；以及电流控制器，连接所述至少一发光光源，所述电流控制器包括 [0010] In another aspect, an embodiment of the present application provides a display system, including: a display device having at least one illuminating light source; and a current controller connecting the at least one illuminating light source, wherein the current controller includes

：工作温度感测器，感测所述至少一发光光源的工作温度；存储装置，连接所述工作温度感测器，被配置为存储分别对应不同工作温度的多个数字参考值，其中每个数字参考值对应所述至少一发光光源的预定驱动电流；数模转换器，连接于所述存储装置及用以转换所述至少一发光光源的工作温度的数字参考值成第一电参数；比较器，连接于所述数模转换器并用以比较所述第一电参数与对应所述至少一发光光源的工作驱动电流的第二电参数，并产生驱动偏置电流；及电流调节器，连接所述比较器及根据所述驱动偏置电流调整所述至少一发光光源的工作驱动电流，其中所述驱动偏置电流对应所述第一电参数及所述第二电参数之间的差值。 a working temperature sensor sensing an operating temperature of the at least one illuminating light source; a storage device coupled to the operating temperature sensor, configured to store a plurality of digital reference values respectively corresponding to different operating temperatures, wherein each The digital reference value corresponds to a predetermined driving current of the at least one illuminating light source; the digital-to-analog converter is connected to the storage device and the digital reference value for converting the operating temperature of the at least one illuminating light source into a first electrical parameter; Connected to the digital-to-analog converter and used to compare the first electrical parameter with a second electrical parameter corresponding to the working drive current of the at least one illuminating light source, and generate a driving bias current; and a current regulator, connected The comparator and adjusting a working drive current of the at least one illuminating light source according to the driving bias current, wherein the driving bias current corresponds to a difference between the first electrical parameter and the second electrical parameter .

[0011] 又一方面，本申请实施例提供了一种显示***的电流驱动方法，包括：计算对应所述至少一发光光源的工作温度的工作温度感测器，并转换所述工作温度为数字参考值，其中所述数字参考值对应至少一发光光源的预定驱动电流；转换所述数字参考值成第一电参数；测量对应所述至少一发光光源的工作驱动电流的第二电参数；比较所述第一电参数与所述第二电参数，并根据比较结果产生驱动偏置电流；及根据所述驱动偏置电流调整所述至少一发光光源的工作驱动电流。 [0011] In another aspect, an embodiment of the present application provides a current driving method for a display system, including: calculating a working temperature sensor corresponding to an operating temperature of the at least one illuminating light source, and converting the working temperature to a number a reference value, wherein the digital reference value corresponds to a predetermined driving current of the at least one illuminating light source; converting the digital reference value into a first electrical parameter; measuring a second electrical parameter corresponding to the working driving current of the at least one illuminating light source; The first electrical parameter and the second electrical parameter are generated according to a comparison result Driving a bias current; and adjusting a working drive current of the at least one illuminating light source according to the driving bias current.

[0012] 又一方面，本申请实施例提供了一种显示***，包括：显示装置，具有至少一发光光源；以及电流控制器，连接所述至少一发光光源，所述电流控制器包括：环境光感测器，感测所述显示装置前方的环境亮度；工作温度感测器，感测所述至少一发光光源的工作温度；存储装置，连接所述环境光感测器及所述工作温度感测器，被配置为存储分别对应不同环境亮度及不同工作温度的多个数字参考值，其中每个数字参考值对应所述至少一发光光源的预定驱动电流；数模转换器，连接于所述存储装置及用以转换所述显示装置前方的环境亮度及所述至少一发光光源的工作温度的数字参考值成第一电参数；比较器，连接于所述数模转换器并用以比较所述第一电参数与对应所述至少一发光光源的工作驱动电流的第二电参数，并产生驱动偏置电流；及电流调节器，连接所述比较器及根据所述驱动偏置电流调整所述至少一发光光源的工作驱动电流，其中驱动偏置电流对应所述第一电参数及所述第二电参数之间的差值。 [0012] In another aspect, an embodiment of the present application provides a display system, including: a display device having at least one illuminating light source; and a current controller connecting the at least one illuminating light source, the current controller comprising: a light sensor that senses an ambient brightness in front of the display device; a working temperature sensor that senses an operating temperature of the at least one light source; a storage device that connects the ambient light sensor and the operating temperature The sensor is configured to store a plurality of digital reference values respectively corresponding to different ambient brightnesses and different operating temperatures, wherein each digital reference value corresponds to a predetermined driving current of the at least one light source; the digital to analog converter is connected to the The storage device and the digital reference value for converting the ambient brightness in front of the display device and the operating temperature of the at least one illuminating light source into a first electrical parameter; a comparator connected to the digital-to-analog converter and used for comparing Determining a first electrical parameter and a second electrical parameter corresponding to a working drive current of the at least one illuminating light source, and generating a drive And a current regulator that is coupled to the comparator and adjusts a working drive current of the at least one illuminating light source according to the driving bias current, wherein the driving bias current corresponds to the first electrical parameter and the second The difference between the electrical parameters.

[0013] 又一方面，本申请实施例提供了一种显示***，包括：显示装置，具有至少一发光光源；以及电流控制器，连接所述至少一发光光源，所述电流控制器包括：第一存储装置，被配置为存储分别对应不同使用条件的多个第一数字参考值，其中每个第一数字参考值对应所述至少一发光光源的预定驱动电流；第一数模转换器，连接于所述第一存储装置及用以转换使用条件下的第一数字参考值成第一电参数；光感测器，感测所述至少一发光光源的亮度；第二存储装置，连接所述光感测器，被配置为存储第二数字参考值，其中所述第二数字参考值对应所述至少一发光光源的工作驱动电流；第二数模转换器，连接于所述第二存储装置及用以转换所述第二数字参考值成第二电参数；比较器，连接于所述第一数模转换器及所述第二数模转换器并用以比较所述第一电参数与所述第二电参数，并产生驱动偏置电流；及电流调节器，连接所述比较器及根据所述驱动偏置电流调整所述至少一发光光源的工作驱动电流，其中所述驱动偏置电流对应所述第一电参数及所述第二电参数之间的差值。 [0013] In another aspect, an embodiment of the present application provides a display system, including: a display device having at least one illuminating light source; and a current controller connecting the at least one illuminating light source, the current controller comprising: a storage device configured to store a plurality of first digital reference values respectively corresponding to different usage conditions, wherein each first digital reference value corresponds to a predetermined driving current of the at least one illuminating light source; a first digital to analog converter, connected The first storage device and the first digital reference value for converting the use condition into a first electrical parameter; the light sensor sensing the brightness of the at least one light source; the second storage device, connecting the a photo sensor, configured to store a second digital reference value, wherein the second digital reference value corresponds to a working drive current of the at least one illuminating light source; and a second digital to analog converter coupled to the second storage device And converting the second digital reference value into a second electrical parameter; a comparator connected to the first digital to analog converter and the second digital to analog And a converter for comparing the first electrical parameter with the second electrical parameter and generating a driving bias current; and a current regulator connecting the comparator and adjusting the at least one illumination according to the driving bias current a working drive current of the light source, wherein the drive bias current corresponds to a difference between the first electrical parameter and the second electrical parameter.

[0014] 又一方面，本申请实施例提供了一种显示***的电流驱动方法，包括：转换第一数字参考值成第一电参数，其中所述第一数字参考值对应至少一发光光源的预定驱动电流；感测对应所述至少一发光光源的亮度的光感测器，并转换所述至少一发光光源的亮度为第二数字参考值，其中所述第二数字参考值对应至少一发光光源的工作驱动电流；转换所述第二数字参考值成第二电参数；比较所述第一电参数与所述第二电参数，并根据比较结果产生驱动偏置电流；及根据所述驱动偏置电流调整所述至少一发光光源的工作驱动电流。 [0014] In another aspect, an embodiment of the present application provides a current driving method of a display system, including: a digital reference value is a first electrical parameter, wherein the first digital reference value corresponds to a predetermined driving current of the at least one illuminating light source; sensing a photo sensor corresponding to the brightness of the at least one illuminating light source, and converting the at least The brightness of an illuminating light source is a second digital reference value, wherein the second digital reference value corresponds to a working driving current of the at least one illuminating light source; converting the second digital reference value into a second electrical parameter; comparing the first electrical quantity a parameter and the second electrical parameter, and generating a driving bias current according to the comparison result; and adjusting a working driving current of the at least one illuminating light source according to the driving bias current.

发明的有益效果 Advantageous effects of the invention

有益效果 Beneficial effect

[0015] 基于上述，本申请通过存储装置预存储多个数字参考值，让每个数字参考值分别对应不同的使用条件，借此依据不同的使用条件选择对应的数字参考值作为调整工作驱动电流的依据。另，本申请的第二电参数，除了可通过直接量测工作驱动电流外，亦可通过设置光感测器，直接感测光亮度来取得对应的工作驱动电流，以避免在相同电流下因总点亮吋间或不同工作温度造成的亮度落差。对附图的简要说明 [0015] Based on the above, the present application pre-stores a plurality of digital reference values by the storage device, so that each digital reference value corresponds to different usage conditions, thereby selecting a corresponding digital reference value as the adjusted working drive current according to different usage conditions. Basis. In addition, the second electrical parameter of the present application, in addition to the direct measurement of the driving current, can also be achieved by directly setting the light sensor to obtain the corresponding working drive current to avoid the same current. The brightness difference caused by the total lighting temperature or the different working temperatures. Brief description of the drawing

附图说明 DRAWINGS

[0016] 为了更清楚地说明本申请实施例技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。 [0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are some embodiments of the present application. Other drawings may also be obtained from those of ordinary skill in the art in view of the drawings.

[0017] 图 1为一种现有用于发光光源的电流调节器的示意图。 1 is a schematic diagram of a conventional current regulator for an illuminating light source.

[0018] 图 2为本申请一实施例中一种利用电压比较器提供发光光源调整工作驱动电流的控制器的示意图。 2 is a schematic diagram of a controller for providing a light source to adjust a working drive current by using a voltage comparator according to an embodiment of the present application.

[0019] 图 3为本申请一实施例中一种利用电流比较器提供发光光源调整工作驱动电流的控制器的示意图。 3 is a schematic diagram of a controller for providing a light source to adjust a working drive current by using a current comparator according to an embodiment of the present application.

[0020] 图 4为本申请一实施例中调整流经发光光源的工作驱动电流的步骤流程图。 4 is a flow chart showing the steps of adjusting the working drive current flowing through the illuminating light source in an embodiment of the present application.

[0021] 图 5为本申请另一实施例中一种利用电压比较器提供发光光源调整工作驱动电流的控制器的示意图。 [0021] FIG. 5 is a schematic diagram of a controller for providing a light source to adjust a working drive current by using a voltage comparator according to another embodiment of the present application.

[0022] 图 6为本申请另一实施例中一种利用电流比较器提供发光光源调整工作驱动电流的控制器的示意图。 [0022] FIG. 6 is a diagram of a method for providing a light source to adjust a working drive power by using a current comparator according to another embodiment of the present application. Schematic diagram of the flow controller.

[0023] 图 7为本申请另一实施例中调整流经发光光源的工作驱动电流的步骤流程图。 7 is a flow chart showing the steps of adjusting the working drive current flowing through the illuminating light source in another embodiment of the present application.

[0024] 图 8为本申请另一实施例中一种利用电压比较器提供发光光源调整工作驱动电流的控制器的示意图。 8 is a schematic diagram of a controller for providing a light source to adjust a working drive current by using a voltage comparator according to another embodiment of the present application.

[0025] 图 9为本申请另一实施例中一种利用电流比较器提供发光光源调整工作驱动电流的控制器的示意图。 9 is a schematic diagram of a controller for providing a light source to adjust a working drive current by using a current comparator according to another embodiment of the present application.

[0026] 图 10为本申请另一实施例中调整流经发光光源的工作驱动电流的步骤流程图。 10 is a flow chart showing the steps of adjusting the working drive current flowing through the illuminating light source in another embodiment of the present application.

[0027] 图 11为本申请另一实施例中一种利用电压比较器提供发光光源调整工作驱动电流的控制器的示意图。 [0027] FIG. 11 is a schematic diagram of a controller for providing a light source to adjust a working drive current using a voltage comparator according to another embodiment of the present application.

[0028] 图 12为本申请另一实施例中一种利用电流比较器提供发光光源调整工作驱动电流的控制器的示意图。 12 is a schematic diagram of a controller for providing a light source to adjust a working drive current using a current comparator according to another embodiment of the present application.

[0029] 图 13为本申请另一实施例中调整流经发光光源的工作驱动电流的步骤流程图。 [0029] FIG. 13 is a flow chart showing the steps of adjusting the working drive current flowing through the illuminating light source in another embodiment of the present application.

本发明的实施方式 Embodiments of the invention

[0030] 下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。 [0030] The technical solutions in the embodiments of the present application are clearly and completely described in the following with reference to the accompanying drawings in the embodiments. It is apparent that the described embodiments are part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application, without departing from the inventive work, are within the scope of the present application.

[0031] 请参阅图 2，显示***，包括：显示装置及电流控制器 260，显示装置可为液晶显示装置，其具有至少一发光光源 214，而至少一发光光源 214可包括数个串连 L ED 242 (l)-(n) , LED 242 (l)-(n)可以串连连接，并联连接，或串连与并联组合方式连接，发光光源 214可以包括用于 LCD***的背光光源，例如用于小型 LCD系统的 LED背光光源， LED背光光源可以包括各种 LED, 例如白光 LED, 彩色 LED 及有机 LED(OLED)等。另外，电流控制器 260，连接至少一发光光源 214，而电流控制器 260包括：计吋器 221、存储装置 220、数模转换器 222、比较器 235及电流调节器 212。计吋器 221计算至少一发光光源 214的总点亮吋间，例如可通过驱动信号 DRV来启动计吋器 221进行总点亮吋间的计算。存储装置 220，连接计吋器 221，被配置为存储分别对应不同总点亮吋间的多个数字参考值 226，其中每个数字参考值 226对应至少一发光光源 214的预定驱动电流，数字参考值可以由仿真发光光源 214所需操作条件而得。例如，如果发光光源 214的亮度与流经发光光源 214的驱动电流成正比，则对应发光光源 214所需亮度的较佳驱动电流值可以由仿真发光光源 214所需亮度的操作条件而得，然后较佳驱动电流值可以利用模拟对数字转换器转换成数字参考值并且储存于存储装置 220中，由于可发光组件会依总点亮吋间而有光衰的现象，也就是总点亮吋间 100小吋与总点亮吋间 5000小吋的发光光源在相同工作驱动电流下发出亮度是不同的，通常总点亮吋间 5000小吋的亮度会小于总点亮吋间 100小吋的亮度。因此，可将发光光源 214 的预定驱动电流设定成与发光光源 214的总点亮吋间成正比，也就是说，发光光源 214的总点亮吋间越久，则预定驱动电流越大，以增加工作驱动电流以补偿光衰现象。数模转换器 222，连接于存储装置 220及用以转换至少一发光光源 214的总点亮吋间的数字参考值 226成第一电参数，例如：数模转换器 222先将数字参考值 226转换成模拟信号并且转呈模拟信号给电压参考单元 230，电压参考单元 2 30用以产生对应于模拟信号的参考电压信号 (第一电参数)，为了说明起见，电压参考单元 230显示为独立的单元，然而，电压参考单元 230可以合并成数模转换器 222，例如，数模转换器 222可以用以将数字参考值 226转换成第一电参数。比较器 235为电压比较器 235，通过电压参考单元 230电性连接于数模转换器 222，并用以比较第一电参数 (如：参考电压值)与对应发光光源 214的工作驱动电流的第二电参数 (如：反馈电压值)，并产生对应二输入电压差值的驱动信号 DRV (如：驱动偏置电流)，及电流调节器 212连接比较器 235及根据驱动偏置电流调整至少一发光光源 214的工作驱动电流，在本实施例中，电流调节器 212包括金属氧化物半导体（MOS)晶体管 240， MOS晶体管 240用以调整发光光源 214的工作驱动电流， MOS晶体管 240的栅极端与电压比较器 235连接，并且接收驱动信号 DR V，而 MOS晶体管 240的源极端接地， MOS晶体管 240的漏极端进一步经二极管 D 连接发光光源 214，二极管 D还经旁路电容器 C接地，二极管 D用以保护发光光源 214避免控制器 260故障，及用以不想要的高频率电流引流经旁路电容器 C接地。在具体应用中，电流控制器还包括检测器 216，检测器 216连接发光光源 214并用以测量第二电参数 (如：反馈电压值)。检测器 216与发光光源 214连接，检测器 216包括检测器电阻 Rs，检测器电阻 Rs用以测定对应流经发光光源 214的工作驱动电流的电压 FB，检测器电阻 Rs与电压比较器 235的输入端连接，电压比较器 23 5接收电压 FB并且将与来自电压参考单元 230的第一电参数 (如：参考电压值)进行比较，并产生 MOS晶体管 240的栅极端的驱动信号 DRV，驱动信号 DRV根据电压 F_B与参考电压值之间的差值驱动 MOS晶体管 240的栅极端， MOS晶体管 240根据驱动信号 DRV调整发光光源 214的工作驱动电流，例如，发光光源 214的总点亮吋间为 5000小吋，则预定驱动电流为 5A、第一电参数 (参考电压值)为 120V，但因点亮吋间过久，发光光源 214的工作驱动电流降低为 3A、第二电参数 (电压 FB) 为 100V，则电压 FB与参考电压值之间的差值即产生相当强的驱动信号 DRV，造成发光光源 214的工作驱动电流增加，同理，如果流经发光光源 214的工作驱动电流过大，则电压比较器 235产生相当弱的驱动信号 DRV，造成发光光源 214的工作驱动电流降低。 Referring to FIG. 2, a display system includes: a display device and a current controller 260. The display device can be a liquid crystal display device having at least one illuminating light source 214, and at least one illuminating light source 214 can include a plurality of series connected L. ED 242 (l)-(n), LED 242 (l)-(n) may be connected in series, in parallel, or in series and in parallel, and the illumination source 214 may include a backlight source for the LCD system, for example LED backlight sources for small LCD systems, LED backlight sources can include a variety of LEDs, such as white LEDs, color LEDs and organic LEDs (OLEDs). In addition, the current controller 260 is connected to at least one illuminating light source 214, and the current controller 260 includes: a counter 221, a storage device 220, a digital to analog converter 222, a comparator 235, and a current regulator 212. The meter 221 calculates the total lighting time of the at least one illuminating light source 214. For example, the calculation of the total lighting time can be initiated by the meter 221 by the driving signal DRV. The storage device 220, the connection meter 221, is configured to store a plurality of digital reference values 226 corresponding to different total lighting conditions, wherein each The digital reference value 226 corresponds to a predetermined drive current of the at least one illumination source 214, and the digital reference value can be derived from the desired operating conditions of the simulated illumination source 214. For example, if the brightness of the illuminating source 214 is proportional to the drive current flowing through the illuminating source 214, the preferred drive current value corresponding to the desired brightness of the illuminating source 214 may be derived from the operating conditions that simulate the desired brightness of the illuminating source 214, and then The preferred driving current value can be converted into a digital reference value by using an analog-to-digital converter and stored in the storage device 220. Since the illuminable component will have a light fading phenomenon depending on the total lighting time, that is, the total lighting time is The illuminating light source of 100 吋 and 5000 吋 in total illumination is different under the same working drive current. Generally, the brightness of 5000 吋 between the total lighting time will be less than the brightness of 100 吋 between the total lighting times. . Therefore, the predetermined driving current of the illuminating light source 214 can be set to be proportional to the total lighting time of the illuminating light source 214, that is, the longer the total lighting time of the illuminating light source 214 is, the larger the predetermined driving current is, Increase the working drive current to compensate for the light decay phenomenon. The digital-to-analog converter 222 is connected to the storage device 220 and the digital reference value 226 for converting the total lighting time of the at least one illuminating light source 214 into a first electrical parameter. For example, the digital-to-analog converter 222 first sets the digital reference value 226. Converted into an analog signal and converted to an analog signal to a voltage reference unit 230, the voltage reference unit 280 is used to generate a reference voltage signal (first electrical parameter) corresponding to the analog signal, for illustrative purposes, the voltage reference unit 230 is shown as independent Units, however, voltage reference unit 230 may be combined into a digital to analog converter 222, for example, digital to analog converter 222 may be used to convert digital reference value 226 to a first electrical parameter. The comparator 235 is a voltage comparator 235, and is electrically connected to the digital-to-analog converter 222 through the voltage reference unit 230, and is configured to compare the first electrical parameter (eg, the reference voltage value) with the second working operating current of the corresponding illuminating source 214. Electrical parameters (eg, feedback voltage values), and generate a drive signal DRV corresponding to the difference between the two input voltages (eg, drive bias current), and the current regulator 212 is coupled to the comparator 235 and adjusts at least one illumination according to the drive bias current The operating current of the light source 214, in the present embodiment, the current regulator 212 includes a metal oxide semiconductor (MOS) transistor 240 for adjusting the operating drive current of the light source 214, the gate terminal and the voltage of the MOS transistor 240. The comparator 235 is connected, and receives the driving signal DR V, and the source terminal of the MOS transistor 240 is grounded. The drain terminal of the MOS transistor 240 is further connected to the illuminating light source 214 via the diode D. The diode D is also grounded via the bypass capacitor C, and the diode D is used. The illuminating light source 214 protects the controller 260 from malfunction and is drained through the bypass capacitor C with an undesired high frequency current. In a particular application, the current controller further includes a detector 216 coupled to the illumination source 214 and configured to measure a second electrical parameter (eg, a feedback voltage value). The detector 216 is connected to the illuminating light source 214, the detector 216 includes a detector resistor Rs for measuring a voltage FB corresponding to a working drive current flowing through the illuminating light source 214, a detector resistor Rs connected to an input terminal of the voltage comparator 235, and a voltage comparator 23 5 receiving a voltage FB And comparing with a first electrical parameter (eg, a reference voltage value) from the voltage reference unit 230, and generating a drive signal DRV at the gate terminal of the MOS transistor 240, the drive signal DRV being between the voltage F _B and the reference voltage value The difference drive MOS transistor 240 has a gate terminal, and the MOS transistor 240 adjusts the operating drive current of the illuminating source 214 according to the driving signal DRV. For example, if the total lighting time of the illuminating source 214 is 5000 吋, the predetermined driving current is 5 A, An electrical parameter (reference voltage value) is 120V, but due to the long time between lighting, the working drive current of the light source 214 is reduced to 3A, and the second electrical parameter (voltage FB) is 100V, then the voltage FB and the reference voltage value are The difference between the two produces a relatively strong drive signal DRV, causing the operating drive current of the illuminating source 214 to increase. Similarly, if the working drive current flows through the illuminating source 214 , The voltage comparator 235 generates a drive signal DRV is relatively weak, causing the work light source driving current 214 is reduced.

[0033] 因此，可在电流控制器 260中设置计吋器 221以计算总点亮吋间，电流控制器 26 [0033] Therefore, the meter 221 can be set in the current controller 260 to calculate the total lighting time, the current controller 26

0根据总点亮吋间自动选择对应的数字参考值 226，并据以增加工作驱动电流以补偿光衰现象。 0 automatically selects the corresponding digital reference value 226 according to the total lighting time, and accordingly increases the working drive current to compensate for the light decay phenomenon.

[0034] 请参阅图 3，显示***，包括：显示装置及电流控制器 260，显示装置可为液晶显示装置，其具有至少一发光光源 214，而至少一发光光源 214可包括数个串连 L ED 242 (l)-(n) , LED 242 (l)-(n)可以串连连接，并联连接，或串连与并联组合方式连接，发光光源 214可以包括用于 LCD***的背光光源，例如用于小型 LCD系统的 LED背光光源， LED背光光源可以包括各种 LED, 例如白光 LED, 彩色 LED 及有机 LED(OLED)等。另外，电流控制器 260，连接至少一发光光源 214，而电流控制器 260包括：计吋器 221、存储装置 220、数模转换器 222、比较器 235及电流调节器 212。计吋器 221计算至少一发光光源 214的总点亮吋间，例如可通过驱动信号 DRV来启动计吋器 221进行总点亮吋间的计算。存储装置 220，连接计吋器 221，被配置为存储分别对应不同总点亮吋间的多个数字参考值 226，其中每个数字参考值 226对应至少一发光光源 214的预定驱动电流，数字参考值可以由仿真发光光源 214所需操作条件而得。例如，如果发光光源 214的亮度与流经发光光源 214的驱动电流成正比，则对应发光光源 214所需亮度的较佳驱动电流值可以由仿真发光光源 214所需亮度的操作条件而得，然后较佳驱动电流值可以利用模拟对数字转换器转换成数字参考值并且储存于存储装置 220中，由于可发光组件会依总点亮吋间而有光衰的现象，也就是总点亮吋间 100小吋与总点亮吋间 5000小吋的发光光源在相同工作驱动电流下发出亮度是不同的，通常总点亮吋间 5000小吋的亮度会小于总点亮吋间 100小吋的亮度。因此，可将发光光源 214 的预定驱动电流设定成与发光光源 214的总点亮吋间成正比，也就是说，发光光源 214的总点亮吋间越久，则预定驱动电流越大，以增加工作驱动电流以补偿光衰现象。数模转换器 222，连接于存储装置 220及用以转换至少一发光光源 214的总点亮吋间的数字参考值 226成第一电参数，例如：数模转换器 222先将数字参考值 226转换成模拟信号并且转呈模拟信号给电流参考单元 232，电流参考单元 2 32用以产生对应于模拟信号的参考电流信号 (第一电参数)，为了说明起见，电流参考单元 232显示为独立的单元，然而，电流参考单元 232可以合并成数模转换器 222，例如，数模转换器 222可以用以将数字参考值 226转换成第一电参数。比较器 237为电流比较器 237，通过电流参考单元 232电性连接于数模转换器 222，并用以比较第一电参数 (如：参考电流值)与对应发光光源 214的工作驱动电流的第二电参数 (如：反馈电流值)，并产生对应二输入电流差值的驱动信号 DRV (如：驱动偏置电流)，及电流调节器 212连接比较器 235及根据驱动偏置电流调整至少一发光光源 214的工作驱动电流，在本实施例中，电流调节器 212包括金属氧化物半导体（MOS)晶体管 240， MOS晶体管 240用以调整发光光源 214的工作驱动电流， MOS晶体管 240的栅极端与电流比较器 237连接，并且接收驱动信号 DR V，而 MOS晶体管 240的源极端接地， MOS晶体管 240的漏极端进一步经二极管 D 连接发光光源 214，二极管 D还经旁路电容器 C接地，二极管 D用以保护发光光源 214避免控制器 260故障，及用以不想要的高频率电流引流经旁路电容器 C接地。在具体应用中，电流控制器还包括检测器 216，检测器 216连接发光光源 214并用以测量第二电参数 (如：反馈电流值)。检测器 216与发光光源 214连接，检测器 216包括感应电阻 Rs及一对 MOS晶体管 252a及 252b。 MOS晶体管 252a及 252b的栅极端接地， MOS晶体管 252b的漏极端与栅极端连接。 MOS晶体管 252a的漏极端与电流比较器 237连接，当流经发光光源 214的驱动电流改变吋，检测器电阻 R s两端上的电压 FB还会随之改变，电压 FB的改变造成 MOS晶体管 252a及 252b的栅极偏置改变，使得流经 MOS晶体管 252a的漏极端的电流改变，当电流比较器 2 37检测到流经 MOS晶体管 252b的电流与参考电流值有差异吋，电流比较器 237即产生对应所述差值的驱动信号 DRV，驱动信号 DRV调整电流调节器 212的驱动电流，例如，发光光源 214的总点亮吋间为 5000小吋，则预定驱动电流为 5A、第一电参数 (参考电流值)为 5A，但因点亮吋间过久，发光光源 214的工作驱动电流降低为 3A、第二电参数为 3A，则电流与参考电流值之间的差值即产生相当强的驱动信号 DRV，造成发光光源 214的工作驱动电流增加，同理，如果流经发光光源 214的工作驱动电流过大，则电流比较器 237产生相当弱的驱动信号 DRV，造成发光光源 214的工作驱动电流降低。 Referring to FIG. 3, the display system includes: a display device and a current controller 260. The display device can be a liquid crystal display device having at least one illuminating light source 214, and the at least one illuminating light source 214 can include a plurality of series connected L. ED 242 (l)-(n), LED 242 (l)-(n) may be connected in series, in parallel, or in series and in parallel, and the illumination source 214 may include a backlight source for the LCD system, for example LED backlight sources for small LCD systems, LED backlight sources can include a variety of LEDs, such as white LEDs, color LEDs and organic LEDs (OLEDs). In addition, the current controller 260 is connected to at least one illuminating light source 214, and the current controller 260 includes: a counter 221, a storage device 220, a digital to analog converter 222, a comparator 235, and a current regulator 212. The meter 221 calculates the total lighting time of the at least one illuminating light source 214. For example, the calculation of the total lighting time can be initiated by the meter 221 by the driving signal DRV. The storage device 220, the connection meter 221, is configured to store a plurality of digital reference values 226 respectively corresponding to different total lighting turns, wherein each digital reference value 226 corresponds to a predetermined driving current of the at least one illuminating light source 214, the digital reference The value can be derived from the desired operating conditions of the simulated illumination source 214. For example, if the brightness of the illuminating source 214 is proportional to the driving current flowing through the illuminating source 214, then the preferred driving current value corresponding to the desired brightness of the illuminating source 214 It can be derived from the operating conditions that simulate the desired brightness of the illumination source 214, and then the preferred drive current value can be converted to a digital reference value using an analog to digital converter and stored in the storage device 220, since the illuminable component will illuminate in accordance with the total There is a phenomenon of light decay in the daytime, that is, the illuminating light source that is always illuminating between 100 吋 and 5000 吋 in the total lighting time is different under the same working drive current, usually always illuminating 5000 The brightness of the small cymbal will be less than the brightness of 100 吋 between the total lighting hours. Therefore, the predetermined driving current of the illuminating light source 214 can be set to be proportional to the total lighting time of the illuminating light source 214, that is, the longer the total lighting time of the illuminating light source 214 is, the larger the predetermined driving current is, Increase the working drive current to compensate for the light decay phenomenon. The digital-to-analog converter 222 is connected to the storage device 220 and the digital reference value 226 for converting the total lighting time of the at least one illuminating light source 214 into a first electrical parameter. For example, the digital-to-analog converter 222 first sets the digital reference value 226. Converted into an analog signal and converted to an analog signal to current reference unit 232, current reference unit 2 32 is used to generate a reference current signal (first electrical parameter) corresponding to the analog signal, for illustrative purposes, current reference unit 232 is shown as independent Units, however, current reference unit 232 can be combined into digital to analog converter 222, for example, digital to analog converter 222 can be used to convert digital reference value 226 to a first electrical parameter. The comparator 237 is a current comparator 237, and is electrically connected to the digital-to-analog converter 222 through the current reference unit 232, and is configured to compare the first electrical parameter (eg, the reference current value) with the second working operating current of the corresponding illuminating source 214. Electrical parameters (such as: feedback current value), and generate a drive signal DRV corresponding to the difference between the two input currents (such as: drive bias current), and the current regulator 212 is connected to the comparator 235 and adjusts at least one illumination according to the drive bias current The operating current of the light source 214, in the present embodiment, the current regulator 212 includes a metal oxide semiconductor (MOS) transistor 240 for adjusting the operating drive current of the light source 214, the gate terminal and current of the MOS transistor 240. The comparator 237 is connected, and receives the driving signal DR V, and the source terminal of the MOS transistor 240 is grounded. The drain terminal of the MOS transistor 240 is further connected to the illuminating light source 214 via the diode D. The diode D is also grounded via the bypass capacitor C, and the diode D is used. The illuminating light source 214 protects the controller 260 from malfunction and is drained through the bypass capacitor C with an undesired high frequency current. In a particular application, the current controller further includes a detector 216 coupled to the illumination source 214 and configured to measure a second electrical parameter (eg, a feedback current value). The detector 216 is coupled to the illumination source 214, and the detector 216 includes a sense resistor Rs and a pair of MOS transistors 252a and 252b. The gate terminals of the MOS transistors 252a and 252b are grounded, and the drain terminal of the MOS transistor 252b is connected to the gate terminal. The drain terminal of the MOS transistor 252a is connected to the current comparator 237, and when the drive current flowing through the light source 214 is changed, the detector resistance R The voltage FB across the s will also change, and the change in voltage FB causes the gate bias of MOS transistors 252a and 252b to change, causing the current flowing through the drain terminal of MOS transistor 252a to change, when current comparator 2 37 detects After the current flowing through the MOS transistor 252b is different from the reference current value, the current comparator 237 generates a driving signal DRV corresponding to the difference, and the driving signal DRV adjusts the driving current of the current regulator 212, for example, the illuminating source 214 The total lighting time is 5000 吋, the predetermined driving current is 5A, and the first electrical parameter (reference current value) is 5A. However, the operating drive current of the illuminating light source 214 is reduced to 3A due to the long time between lighting periods. The second electrical parameter is 3A, and the difference between the current and the reference current value produces a relatively strong driving signal DRV, causing the working drive current of the illuminating light source 214 to increase. Similarly, if the working driving current flows through the illuminating source 214 If large, the current comparator 237 generates a relatively weak drive signal DRV, causing the operating drive current of the illuminating source 214 to decrease.

[0036] 因此，可在电流控制器 260中设置计吋器 221以计算总点亮吋间，电流控制器 26 0根据总点亮吋间自动选择对应的数字参考值 226，并据以增加工作驱动电流以补偿光衰现象。 [0036] Therefore, the meter 221 can be set in the current controller 260 to calculate the total lighting time, and the current controller 26 0 automatically selects the corresponding digital reference value 226 according to the total lighting time, and accordingly increases the work. Drive current to compensate for light decay.

[0037] 请参阅图 4，本实施例中，以特定顺序执行各步骤，然而，若以适当电路执行吋，上述步骤可以不限所述特定顺序执行，可以任何顺序同吋进行或依次进行。首先，步骤 410，计算对应发光光源的总点亮吋间的计吋器，并转换发光光源的总点亮吋间为数字参考值，其中数字参考值对应发光光源的预定驱动电流。步骤 420，然后转换数字参考值成第一电参数（电压或电流）。步骤 430，测量对应发光光源的工作驱动电流的第二电参数（电压或电流）。步骤 440，比较第一电参数与第二电参数。接着，步骤 450，判断所测得的第一电参数与第二电参数之间是否有差异。若有差异，则执行步骤 460，根据比较结果产生驱动偏置电流，以调整发光光源的工作驱动电流，并重复执行步骤 430至 460，直至第一电参数与第二电参数之间无差异吋，则结束。 Referring to FIG. 4, in this embodiment, the steps are performed in a specific order. However, if the circuit is executed in an appropriate circuit, the above steps may be performed in any specific order, and may be performed in any order or sequentially. First, in step 410, a meter corresponding to the total lighting time of the illuminating light source is calculated, and the total lighting time of the illuminating light source is converted to a digital reference value, wherein the digital reference value corresponds to a predetermined driving current of the illuminating light source. Step 420, then converting the digital reference value to a first electrical parameter (voltage or current). Step 430: Measure a second electrical parameter (voltage or current) corresponding to the working drive current of the illuminating light source. Step 440, comparing the first electrical parameter with the second electrical parameter. Next, in step 450, it is determined whether there is a difference between the measured first electrical parameter and the second electrical parameter. If there is a difference, step 460 is executed to generate a driving bias current according to the comparison result to adjust the working driving current of the illuminating light source, and steps 430 to 460 are repeatedly performed until there is no difference between the first electrical parameter and the second electrical parameter. , then it ends.

[0038] 请参阅图 5，显示***，包括：显示装置及电流控制器 260，显示装置为液晶显示装置，其具有至少一发光光源 214，而至少一发光光源 214包括数个串连 LED 242 (l)-(n) , LED 242 (l)-(n)可以串连连接，并联连接，或串连与并联组合方式连接，发光光源 214可以包括用于 LCD***的背光光源，例如用于小型 LCD*** 的 LED背光光源， LED背光光源可以包括各种 LED, 例如白光 LED, 彩色 LED及有机 LED(OLED)等。另外，电流控制器 260，连接至少一发光光源 214，而电流控制器 260包括：环境光感测器 223、存储装置 220、数模转换器 222、比较器 235 及电流调节器 212。环境光感测器 223感测显示装置前方的环境亮度。存储装置 2 20，连接环境光感测器 223，被配置为存储分别对应不同环境亮度的多个数字参考值 226，其中每个数字参考值 226对应至少一发光光源 214的预定驱动电流，数字参考值可以由仿真发光光源 214所需操作条件而得。例如，如果发光光源 214 的亮度与流经发光光源 214的驱动电流成正比，则对应发光光源 214所需亮度的较佳驱动电流值可以由仿真发光光源 214所需亮度的操作条件而得，然后较佳驱动电流值可以利用模拟对数字转换器转换成数字参考值并且储存于存储装置 220 中，由于人眼在比较亮的环境需要比较高的背光，才能看清楚显示装置上的内容，而在比较暗的环境，过高的背光会造成眼睛不舒适甚至伤害，此吋则需要较低的背光照明。数字参考 226即针对不同的环境亮度进行不同程度的工作驱动电流控制。因此，可将发光光源 214的预定驱动电流设定成与环境亮度成正比，也就是说，环境亮度越亮，则预定驱动电流越大，以增加工作驱动电流以产生较高的背光。数模转换器 222，连接于存储装置 220及用以转换显示装置前方的环境亮度的数字参考值 226成第一电参数，例如：数模转换器 222先将数字参考值 226转换成模拟信号并且转呈模拟信号给电压参考单元 230，电压参考单元 230 用以产生对应于模拟信号的参考电压信号 (第一电参数)，为了说明起见，电压参考单元 230显示为独立的单元，然而，电压参考单元 230可以合并成数模转换器 2 22，例如，数模转换器 222可以用以将数字参考值 226转换成第一电参数。比较器 235为电压比较器 235，通过电压参考单元 230电性连接于数模转换器 222，并用以比较第一电参数 (如：参考电压值)与对应发光光源 214的工作驱动电流的第二电参数 (如：反馈电压值)，并产生对应二输入电压差值的驱动信号 DRV (如：驱动偏置电流)，及电流调节器 212连接比较器 235及根据驱动偏置电流调整至少一发光光源 214的工作驱动电流，在本实施例中，电流调节器 212包括金属氧化物半导体（MOS)晶体管 240， MOS晶体管 240用以调整发光光源 214的工作驱动电流， MOS晶体管 240的栅极端与电压比较器 235连接，并且接收驱动信号 DRV ，而 MOS晶体管 240的源极端接地， MOS晶体管 240的漏极端进一步经二极管 D 连接发光光源 214，二极管 D还经旁路电容器 C接地，二极管 D用以保护发光光源 214避免控制器 260故障，及用以不想要的高频率电流引流经旁路电容器 C接地。 Referring to FIG. 5, a display system includes: a display device and a current controller 260. The display device is a liquid crystal display device having at least one illuminating light source 214, and the at least one illuminating light source 214 includes a plurality of serially connected LEDs 242 ( L)-(n), LED 242 (l)-(n) may be connected in series, in parallel, or in series and in parallel, and the light source 214 may include a backlight source for the LCD system, for example for small LED backlight source for LCD system, LED backlight source can include various LEDs, such as white LED, color LED and Organic LED (OLED), etc. In addition, the current controller 260 is connected to at least one illuminating light source 214, and the current controller 260 includes: an ambient light sensor 223, a storage device 220, a digital to analog converter 222, a comparator 235, and a current regulator 212. The ambient light sensor 223 senses the ambient brightness in front of the display device. The storage device 2 20 is connected to the ambient light sensor 223, and configured to store a plurality of digital reference values 226 corresponding to different ambient brightnesses, wherein each of the digital reference values 226 corresponds to a predetermined driving current of the at least one light source 214, the digital reference The value can be derived from the desired operating conditions of the simulated illumination source 214. For example, if the brightness of the illuminating source 214 is proportional to the drive current flowing through the illuminating source 214, the preferred drive current value corresponding to the desired brightness of the illuminating source 214 can be derived from the operating conditions that simulate the desired brightness of the illuminating source 214, and then The preferred driving current value can be converted into a digital reference value by using the analog-to-digital converter and stored in the storage device 220. Since the human eye needs a relatively high backlight in a relatively bright environment, the content on the display device can be clearly seen. In a darker environment, too high a backlight can cause discomfort or even damage to the eyes, which in turn requires lower backlighting. The digital reference 226 performs different levels of work drive current control for different ambient brightness levels. Therefore, the predetermined driving current of the illuminating light source 214 can be set to be proportional to the ambient brightness, that is, the brighter the ambient brightness, the larger the predetermined driving current is to increase the working driving current to generate a higher backlight. The digital-to-analog converter 222 is connected to the storage device 220 and the digital reference value 226 for converting the ambient brightness in front of the display device into a first electrical parameter. For example, the digital-to-analog converter 222 first converts the digital reference value 226 into an analog signal and The analog signal is forwarded to the voltage reference unit 230, and the voltage reference unit 230 is used to generate a reference voltage signal (first electrical parameter) corresponding to the analog signal. For the sake of explanation, the voltage reference unit 230 is displayed as a separate unit, however, the voltage reference Units 230 can be combined into a digital to analog converter 2 22, for example, digital to analog converter 222 can be used to convert digital reference value 226 to a first electrical parameter. The comparator 235 is a voltage comparator 235, and is electrically connected to the digital-to-analog converter 222 through the voltage reference unit 230, and is configured to compare the first electrical parameter (eg, the reference voltage value) with the second working operating current of the corresponding illuminating source 214. Electrical parameters (eg, feedback voltage values), and generate a drive signal DRV corresponding to the difference between the two input voltages (eg, drive bias current), and the current regulator 212 is coupled to the comparator 235 and adjusts at least one illumination according to the drive bias current The operating current of the light source 214, in the present embodiment, the current regulator 212 includes a metal oxide semiconductor (MOS) transistor 240 for adjusting the operating drive current of the light source 214, the gate terminal and the voltage of the MOS transistor 240. The comparator 235 is connected and receives the drive signal DRV, and the source terminal of the MOS transistor 240 is grounded, and the drain terminal of the MOS transistor 240 is further passed through the diode D. The illuminating light source 214 is connected. The diode D is also grounded via a bypass capacitor C. The diode D is used to protect the illuminating light source 214 from the failure of the controller 260, and is used to drain the bypass capacitor C to ground with an undesired high frequency current.

[0039] 在具体应用中，电流控制器还包括检测器 216，检测器 216连接发光光源 214并用以测量第二电参数 (如：反馈电压值)。检测器 216与发光光源 214连接，检测器 216包括检测器电阻 Rs，检测器电阻 Rs用以测定对应流经发光光源 214的工作驱动电流的电压 FB，检测器电阻 Rs与电压比较器 235的输入端连接，电压比较器 23 5接收电压 FB并且将与来自电压参考单元 230的第一电参数 (如：参考电压值)进行比较，并产生 MOS晶体管 240的栅极端的驱动信号 DRV，驱动信号 DRV根据电压 F_B与参考电压值之间的差值驱动 MOS晶体管 240的栅极端， MOS晶体管 240根据驱动信号 DRV调整发光光源 214的工作驱动电流，例如，显示装置前方的环境亮度为 200nits，则预定驱动电流为 5A、第一电参数 (参考电压值)为 120V，但此吋发光光源 214的工作驱动电流仅为 3A、第二电参数 (电压 FB)为 100V，则电压 FB 与参考电压值之间的差值即产生相当强的驱动信号 DRV，造成发光光源 214的工作驱动电流增加，以产生较高的背光，同理，如果流经发光光源 214的工作驱动电流过大，则电压比较器 235产生相当弱的驱动信号 DRV，造成发光光源 214的工作驱动电流降低。 [0039] In a particular application, the current controller further includes a detector 216 coupled to the illumination source 214 and configured to measure a second electrical parameter (eg, a feedback voltage value). The detector 216 is coupled to the illumination source 214. The detector 216 includes a detector resistor Rs for determining the voltage FB corresponding to the operating drive current flowing through the illumination source 214, the detector resistor Rs and the input of the voltage comparator 235. The terminal is connected, the voltage comparator 23 5 receives the voltage FB and compares it with the first electrical parameter (eg, the reference voltage value) from the voltage reference unit 230, and generates the drive signal DRV of the gate terminal of the MOS transistor 240, the drive signal DRV. The gate terminal of the MOS transistor 240 is driven according to the difference between the voltage F _B and the reference voltage value, and the MOS transistor 240 adjusts the working driving current of the illuminating light source 214 according to the driving signal DRV, for example, the ambient brightness in front of the display device is 200 nits, then predetermined The driving current is 5A, and the first electrical parameter (reference voltage value) is 120V, but the working driving current of the xenon light source 214 is only 3A, and the second electrical parameter (voltage FB) is 100V, then the voltage FB and the reference voltage value are The difference between the two produces a relatively strong drive signal DRV, causing the operating drive current of the illuminating source 214 to increase to produce a higher backlight. Similarly, If the light source 214 flows through the work of the drive current is too large, the voltage comparator 235 generates a drive signal DRV is relatively weak, causing the work light source driving current 214 is reduced.

[0040] 因此，可在电流控制器 260中设置环境光感测器 223感测显示装置前方的环境亮度，电流控制器 260根据环境亮度自动选择对应的数字参考值 226，并据以调整工作驱动电流。 [0040] Therefore, the ambient light sensor 223 can be disposed in the current controller 260 to sense the ambient brightness in front of the display device, and the current controller 260 automatically selects a corresponding digital reference value 226 according to the ambient brightness, and adjusts the work drive accordingly. Current.

[0041] 请参阅图 6，显示***，包括：显示装置及电流控制器 260，显示装置为液晶显示装置，其具有至少一发光光源 214，而至少一发光光源 214包括数个串连 LED 242 (l)-(n) , LED 242 (l)-(n)可以串连连接，并联连接，或串连与并联组合方式连接，发光光源 214可以包括用于 LCD***的背光光源，例如用于小型 LCD*** 的 LED背光光源， LED背光光源可以包括各种 LED, 例如白光 LED, 彩色 LED及有机 LED(OLED)等。另外，电流控制器 260，连接至少一发光光源 214，而电流控制器 260包括：环境光感测器 223、存储装置 220、数模转换器 222、比较器 235 及电流调节器 212。环境光感测器 223感测显示装置前方的环境亮度。存储装置 2 20，连接环境光感测器 223，被配置为存储分别对应不同环境亮度的多个数字参考值 226，其中每个数字参考值 226对应至少一发光光源 214的预定驱动电流，数字参考值可以由仿真发光光源 214所需操作条件而得。例如，如果发光光源 214 的亮度与流经发光光源 214的驱动电流成正比，则对应发光光源 214所需亮度的较佳驱动电流值可以由仿真发光光源 214所需亮度的操作条件而得，然后较佳驱动电流值可以利用模拟对数字转换器转换成数字参考值并且储存于存储装置 220 中，由于人眼在比较亮的环境需要比较高的背光，才能看清楚显示装置上的内容，而在比较暗的环境，过高的背光会造成眼睛不舒适甚至伤害，此吋则需要较低的背光照明。数字参考 226即针对不同的环境亮度进行不同程度的工作驱动电流的控制。因此，可将发光光源 214的预定驱动电流设定成与环境亮度成正比，也就是说，环境亮度越亮，则预定驱动电流越大，以增加工作驱动电流以产生较高的背光。数模转换器 222，连接于存储装置 220及用以转换显示装置前方的环境亮度的数字参考值 226成第一电参数，例如：数模转换器 222先将数字参考值 226转换成模拟信号并且转呈模拟信号给电流参考单元 232，电流参考单元 2 32用以产生对应于模拟信号的参考电流信号 (第一电参数)，为了说明起见，电流参考单元 232显示为独立的单元，然而，电流参考单元 232可以合并成数模转换器 222，例如，数模转换器 222可以用以将数字参考值 226转换成第一电参数。比较器 237为电流比较器 237，通过电流参考单元 232电性连接于数模转换器 222，并用以比较第一电参数 (如：参考电流值)与对应发光光源 214的工作驱动电流的第二电参数 (如：反馈电流值)，并产生对应二输入电流差值的驱动信号 DRV (如：驱动偏置电流)，及电流调节器 212连接比较器 235及根据驱动偏置电流调整至少一发光光源 214的工作驱动电流，在本实施例中，电流调节器 212包括金属氧化物半导体（MOS)晶体管 240， MOS晶体管 240用以调整发光光源 214的工作驱动电流， MOS晶体管 240的栅极端与电流比较器 237连接，并且接收驱动信号 DR V，而 MOS晶体管 240的源极端接地， MOS [0041] Referring to FIG. 6, a display system includes: a display device and a current controller 260. The display device is a liquid crystal display device having at least one illuminating light source 214, and the at least one illuminating light source 214 includes a plurality of serially connected LEDs 242 ( L)-(n), LED 242 (l)-(n) may be connected in series, in parallel, or in series and in parallel, and the light source 214 may include a backlight source for the LCD system, for example for small LED backlight source for LCD system, LED backlight source can include various LEDs, such as white LED, color LED and organic LED (OLED). In addition, the current controller 260 is connected to at least one illuminating light source 214, and the current controller 260 includes: an ambient light sensor 223, a storage device 220, a digital to analog converter 222, a comparator 235, and a current regulator 212. The ambient light sensor 223 senses the ambient brightness in front of the display device. The storage device 2 20 is connected to the ambient light sensor 223, and configured to store a plurality of digital parameters respectively corresponding to different ambient brightnesses. The value 226 is determined, wherein each of the digital reference values 226 corresponds to a predetermined driving current of the at least one illuminating light source 214, and the digital reference value can be obtained by simulating the required operating conditions of the illuminating light source 214. For example, if the brightness of the illuminating source 214 is proportional to the drive current flowing through the illuminating source 214, the preferred drive current value corresponding to the desired brightness of the illuminating source 214 can be derived from the operating conditions that simulate the desired brightness of the illuminating source 214, and then The preferred driving current value can be converted into a digital reference value by using the analog-to-digital converter and stored in the storage device 220. Since the human eye needs a relatively high backlight in a relatively bright environment, the content on the display device can be clearly seen. In a darker environment, too high a backlight can cause discomfort or even damage to the eyes, which in turn requires lower backlighting. The digital reference 226 performs different degrees of control of the working drive current for different ambient brightness. Therefore, the predetermined driving current of the illuminating light source 214 can be set to be proportional to the ambient brightness, that is, the brighter the ambient brightness, the larger the predetermined driving current is to increase the working driving current to generate a higher backlight. The digital-to-analog converter 222 is connected to the storage device 220 and the digital reference value 226 for converting the ambient brightness in front of the display device into a first electrical parameter. For example, the digital-to-analog converter 222 first converts the digital reference value 226 into an analog signal and The analog signal is forwarded to the current reference unit 232, and the current reference unit 232 is used to generate a reference current signal (first electrical parameter) corresponding to the analog signal. For the sake of explanation, the current reference unit 232 is shown as a separate unit, however, the current Reference unit 232 can be combined into a digital to analog converter 222, for example, digital to analog converter 222 can be used to convert digital reference value 226 to a first electrical parameter. The comparator 237 is a current comparator 237, and is electrically connected to the digital-to-analog converter 222 through the current reference unit 232, and is configured to compare the first electrical parameter (eg, the reference current value) with the second working operating current of the corresponding illuminating source 214. Electrical parameters (such as: feedback current value), and generate a drive signal DRV corresponding to the difference between the two input currents (such as: drive bias current), and the current regulator 212 is connected to the comparator 235 and adjusts at least one illumination according to the drive bias current The operating current of the light source 214, in the present embodiment, the current regulator 212 includes a metal oxide semiconductor (MOS) transistor 240 for adjusting the operating drive current of the light source 214, the gate terminal and current of the MOS transistor 240. The comparator 237 is connected and receives the drive signal DR V while the source terminal of the MOS transistor 240 is grounded, MOS

晶体管 240的漏极端进一步经二极管 D连接发光光源 214，二极管 D还经旁路电容器 C接地，二极管 D用以保护发光光源 214避免控制器 260故障，及用以不想要的高频率电流引流经旁路电容器 C接地。 The drain terminal of the transistor 240 is further connected to the illuminating light source 214 via a diode D. The diode D is also grounded via a bypass capacitor C. The diode D is used to protect the illuminating light source 214 from the failure of the controller 260, and is used to drain an unwanted high frequency current. The path capacitor C is grounded.

在具体应用中，电流控制器还包括检测器 216，检测器 216连接发光光源 214并用以测量第二电参数 (如：反馈电流值)。检测器 216与发光光源 214连接，检测器 216包括感应电阻 Rs及一对 MOS晶体管 252a及 252b。 MOS晶体管 252a及 252b的栅极端接地， MOS晶体管 252b的漏极端与栅极端连接。 MOS晶体管 252a的漏极端与电流比较器 237连接，当流经发光光源 214的驱动电流改变吋，检测器电阻 R s两端上的电压 FB还会随之改变，电压 FB的改变造成 MOS晶体管 252a及 252b的栅极偏置改变，使得流经 MOS晶体管 252a的漏极端的电流改变，当电流比较器 2 37检测到流经 MOS晶体管 252b的电流与参考电流值有差异吋，电流比较器 237即产生对应所述差值的驱动信号 DRV，驱动信号 DRV调整电流调节器 212的驱动电流，例如，显示装置前方的环境亮度为 200nits，则预定驱动电流为 5A、第一电参数 (参考电流值)为 5A，但此吋发光光源 214的工作驱动电流仅为 3A、第二电参数为 3A，则电流与参考电流值之间的差值即产生相当强的驱动信号 DRV，造成发光光源 214的工作驱动电流增加，以产生较高的背光，同理，如果流经发光光源 214的工作驱动电流过大，则电流比较器 237产生相当弱的驱动信号 DRV，造成发光光源 214的工作驱动电流降低。 In a specific application, the current controller further includes a detector 216 coupled to the illumination source 214 and Used to measure the second electrical parameter (such as: feedback current value). The detector 216 is coupled to the illumination source 214, and the detector 216 includes a sense resistor Rs and a pair of MOS transistors 252a and 252b. The gate terminals of the MOS transistors 252a and 252b are grounded, and the drain terminal of the MOS transistor 252b is connected to the gate terminal. The drain terminal of the MOS transistor 252a is connected to the current comparator 237. When the driving current flowing through the illuminating light source 214 is changed, the voltage FB across the detector resistor Rs is also changed, and the change of the voltage FB causes the MOS transistor 252a. The gate bias of 252b is changed such that the current flowing through the drain terminal of MOS transistor 252a changes. When current comparator 237 detects that the current flowing through MOS transistor 252b is different from the reference current value, current comparator 237 is A driving signal DRV corresponding to the difference is generated, and the driving signal DRV adjusts a driving current of the current regulator 212. For example, if the ambient brightness in front of the display device is 200 nits, the predetermined driving current is 5 A, and the first electrical parameter (reference current value) 5A, but the working driving current of the illuminating light source 214 is only 3A, and the second electrical parameter is 3A, the difference between the current and the reference current value generates a relatively strong driving signal DRV, resulting in the operation of the illuminating light source 214. The drive current is increased to produce a higher backlight. Similarly, if the operating drive current flowing through the illuminating source 214 is too large, the current comparator 237 is relatively weak. The drive signal DRV causes the operating drive current of the illuminating light source 214 to decrease.

[0043] 因此，可在电流控制器 260中设置环境光感测器 223以感测显示装置前方的环境亮度，电流控制器 260根据环境亮度自动选择对应的数字参考值 226，并据以调整工作驱动电流。 [0043] Therefore, the ambient light sensor 223 can be disposed in the current controller 260 to sense the ambient brightness in front of the display device, and the current controller 260 automatically selects the corresponding digital reference value 226 according to the ambient brightness, and adjusts the work accordingly. Drive current.

[0044] 请参阅图 7，本实施例中，以特定顺序执行各步骤，然而，若以适当电路执行吋，上述步骤可以不限所述特定顺序执行，可以任何顺序同吋进行或依次进行。首先，步骤 411，感测对应显示装置前方的环境亮度的环境光感测器，并转换环境亮度为数字参考值，其中数字参考值对应发光光源的预定驱动电流。步骤 421，然后转换数字参考值成第一电参数（电压或电流）。步骤 431，测量对应发光光源的工作驱动电流的第二电参数（电压或电流）。步骤 441，比较第一电参数与第二电参数。接着，步骤 451，判断所测得的第一电参数与第二电参数之间是否有差异。若有差异，则执行步骤 461，根据比较结果产生驱动偏置电流，以调整发光光源的工作驱动电流，并重复执行步骤 431至 461，直至第一电参数与第二电参数之间无差异吋，则结束。 Referring to FIG. 7, in this embodiment, the steps are performed in a specific order. However, if executed in an appropriate circuit, the above steps may be performed in any specific order, and may be performed in any order or sequentially. First, in step 411, an ambient light sensor corresponding to the ambient brightness in front of the display device is sensed, and the ambient brightness is converted to a digital reference value, wherein the digital reference value corresponds to a predetermined driving current of the light source. Step 421, and then converting the digital reference value into a first electrical parameter (voltage or current). Step 431: Measure a second electrical parameter (voltage or current) corresponding to the working drive current of the illuminating light source. Step 441: Compare the first electrical parameter with the second electrical parameter. Next, in step 451, it is determined whether there is a difference between the measured first electrical parameter and the second electrical parameter. If there is a difference, step 461 is executed to generate a driving bias current according to the comparison result to adjust the working driving current of the illuminating light source, and steps 431 to 461 are repeatedly performed until there is no difference between the first electrical parameter and the second electrical parameter. , then it ends.

[0045] 请参阅图 8，显示***，包括：显示装置及电流控制器 260，显示装置为液晶显示装置，其具有至少一发光光源 214，而至少一发光光源 214包括数个串连 LED 242 (l)-(n) , LED 242 (l)-(n)可以串连连接，并联连接，或串连与并联组合方式连接，发光光源 214可以包括用于 LCD***的背光光源，例如用于小型 LCD*** 的 LED背光光源， LED背光光源可以包括各种 LED, 例如白光 LED, 彩色 LED及有机 LED(OLED)等。另外，电流控制器 260，连接至少一发光光源 214，而电流控制器 260包括：工作温度感测器 224、存储装置 220、数模转换器 222、比较器 2 35及电流调节器 212。工作温度感测器 224感测发光光源 214的工作温度。存储装置 220，连接工作温度感测器 224，被配置为存储分别对应不同工作温度的多个数字参考值 226，其中每个数字参考值 226对应至少一发光光源 214的预定驱动电流，数字参考值可以由仿真发光光源 214所需操作条件而得。例如，如果发光光源 214的亮度与流经发光光源 214的驱动电流成正比，则对应发光光源 214所需亮度的较佳驱动电流值可以由仿真发光光源 214所需亮度的操作条件而得，然后较佳驱动电流值可以利用模拟对数字转换器转换成数字参考值并且储存于存储装置 220中，由于发光光源 214在不同的温度下，以相同的工作驱动电流发光光源 2 14，会有不同的亮度，发光光源 214的工作温度越高，会有越亮的亮度，因此需要降低工作驱动电流。数字参考 226即针对不同的工作温度进行不同程度的工作驱动电流的控制。因此，可将发光光源 214的预定驱动电流设定成与工作温度成反比，也就是说，工作温度越高，则预定驱动电流越小，以减少工作驱动电流。数模转换器 222，连接于存储装置 220及用以转换发光光源 214的工作温度的数字参考值 226成第一电参数，例如：数模转换器 222先将数字参考值 226转换成模拟信号并且转呈模拟信号给电压参考单元 230，电压参考单元 230用以产生对应于模拟信号的参考电压信号 (第一电参数)，为了说明起见，电压参考单元 230显示为独立的单元，然而，电压参考单元 230可以合并成数模转换器 222，例如，数模转换器 222可以用以将数字参考值 226转换成第一电参数。比较器 235为电压比较器 235，通过电压参考单元 230电性连接于数模转换器 222，并用以比较第一电参数 (如：参考电压值)与对应发光光源 214的工作驱动电流的第二电参数 (如：反馈电压值)，并产生对应二输入电压差值的驱动信号 DRV (如：驱动偏置电流），及电流调节器 212连接比较器 235及根据驱动偏置电流调整至少一发光光源 214 的工作驱动电流，在本实施例中，电流调节器 212包括金属氧化物半导体（MOS )晶体管 240， MOS晶体管 240用以调整发光光源 214的工作驱动电流， MOS晶体管 240的栅极端与电压比较器 235连接，并且接收驱动信号 DRV，而 MOS晶体管 2 40的源极端接地， MOS晶体管 240的漏极端进一步经二极管 D连接发光光源 214，二极管 D还经旁路电容器 C接地，二极管 D用以保护发光光源 214避免控制器 260 故障，及用以不想要的高频率电流引流经旁路电容器 C接地。 [0045] Referring to FIG. 8, a display system includes: a display device and a current controller 260, wherein the display device is a liquid crystal display The display device has at least one illuminating light source 214, and the at least one illuminating light source 214 includes a plurality of series connected LEDs 242(l)-(n), and the LEDs 242(l)-(n) can be connected in series, connected in parallel, or Connected in series and in parallel, the illuminating light source 214 may include a backlight source for an LCD system, such as an LED backlight source for a small LCD system. The LED backlight source may include various LEDs, such as white LEDs, color LEDs, and organic LEDs. (OLED), etc. In addition, the current controller 260 is connected to at least one illuminating light source 214, and the current controller 260 includes: an operating temperature sensor 224, a storage device 220, a digital to analog converter 222, a comparator 235, and a current regulator 212. The operating temperature sensor 224 senses the operating temperature of the illuminating light source 214. The storage device 220 is connected to the operating temperature sensor 224 and configured to store a plurality of digital reference values 226 respectively corresponding to different operating temperatures, wherein each of the digital reference values 226 corresponds to a predetermined driving current of the at least one illuminating source 214, and the digital reference value It can be derived from the operating conditions required to simulate the illumination source 214. For example, if the brightness of the illuminating source 214 is proportional to the drive current flowing through the illuminating source 214, the preferred drive current value corresponding to the desired brightness of the illuminating source 214 may be derived from the operating conditions that simulate the desired brightness of the illuminating source 214, and then The preferred driving current value can be converted into a digital reference value by using an analog-to-digital converter and stored in the storage device 220. Since the illuminating light source 214 is driven at the same temperature and at the same temperature, the illuminating source 2 14 will be different. Brightness, the higher the operating temperature of the illuminating light source 214, the brighter the brightness, and therefore the operating drive current needs to be reduced. The digital reference 226 performs different degrees of control of the working drive current for different operating temperatures. Therefore, the predetermined driving current of the illuminating light source 214 can be set to be inversely proportional to the operating temperature, that is, the higher the operating temperature, the smaller the predetermined driving current to reduce the operating driving current. The digital-to-analog converter 222 is connected to the storage device 220 and the digital reference value 226 for converting the operating temperature of the illuminating light source 214 into a first electrical parameter. For example, the digital-to-analog converter 222 first converts the digital reference value 226 into an analog signal and The analog signal is forwarded to the voltage reference unit 230, and the voltage reference unit 230 is used to generate a reference voltage signal (first electrical parameter) corresponding to the analog signal. For the sake of explanation, the voltage reference unit 230 is displayed as a separate unit, however, the voltage reference Units 230 can be combined into a digital to analog converter 222, for example, digital to analog converter 222 can be used to convert digital reference value 226 to a first electrical parameter. The comparator 235 is a voltage comparator 235, and is electrically connected to the digital-to-analog converter 222 through the voltage reference unit 230, and is configured to compare the first electrical parameter (eg, the reference voltage value) with the second working operating current of the corresponding illuminating source 214. Electrical parameters (such as: feedback voltage value), and generate a drive signal DRV corresponding to the difference between the two input voltages (such as: drive bias current), and the current regulator 212 is connected to the comparator 235 and adjusts at least one illumination according to the drive bias current Light source 214 In the present embodiment, the current regulator 212 includes a metal oxide semiconductor (MOS) transistor 240 for adjusting the operating drive current of the light source 214, the gate terminal of the MOS transistor 240 and the voltage comparator. 235 is connected, and receives the driving signal DRV, and the source terminal of the MOS transistor 240 is grounded. The drain terminal of the MOS transistor 240 is further connected to the illuminating light source 214 via the diode D. The diode D is also grounded via the bypass capacitor C, and the diode D is used to protect the illuminating light. Light source 214 prevents controller 260 from malfunctioning and is drained through bypass capacitor C with unwanted high frequency currents.

[0046] 在具体应用中，电流控制器还包括检测器 216，检测器 216连接发光光源 214并用以测量第二电参数 (如：反馈电压值)。检测器 216与发光光源 214连接，检测器 216包括检测器电阻 Rs，检测器电阻 Rs用以测定对应流经发光光源 214的工作驱动电流的电压 FB，检测器电阻 Rs与电压比较器 235的输入端连接，电压比较器 23 5接收电压 FB并且将与来自电压参考单元 230的第一电参数 (如：参考电压值)进行比较，并产生 MOS晶体管 240的栅极端的驱动信号 DRV，驱动信号 DRV根据电压 F_B与参考电压值之间的差值驱动 MOS晶体管 240的栅极端， MOS晶体管 240根据驱动信号 DRV调整发光光源 214的工作驱动电流，例如，发光光源 214的工作温度为 50度，则预定驱动电流为 5A、第一电参数 (参考电压值)为 120V，但此吋发光光源 214的工作驱动电流仅为 3A、第二电参数 (电压 FB)为 100V，则电压 FB与参考电压值之间的差值即产生相当强的驱动信号 DRV，造成发光光源 214的工作驱动电流增加，以产生较高的亮度，同理，如果流经发光光源 214的工作驱动电流过大，则电压比较器 235产生相当弱的驱动信号 DRV，造成发光光源 214的工作驱动电流降低。 [0046] In a particular application, the current controller further includes a detector 216 coupled to the illumination source 214 and configured to measure a second electrical parameter (eg, a feedback voltage value). The detector 216 is coupled to the illumination source 214. The detector 216 includes a detector resistor Rs for determining the voltage FB corresponding to the operating drive current flowing through the illumination source 214, the detector resistor Rs and the input of the voltage comparator 235. The terminal is connected, the voltage comparator 23 5 receives the voltage FB and compares it with the first electrical parameter (eg, the reference voltage value) from the voltage reference unit 230, and generates the drive signal DRV of the gate terminal of the MOS transistor 240, the drive signal DRV. The gate terminal of the MOS transistor 240 is driven according to the difference between the voltage F _B and the reference voltage value, and the MOS transistor 240 adjusts the operating driving current of the illuminating source 214 according to the driving signal DRV. For example, the operating temperature of the illuminating source 214 is 50 degrees. The predetermined driving current is 5A, and the first electrical parameter (reference voltage value) is 120V, but the working driving current of the xenon light source 214 is only 3A, and the second electrical parameter (voltage FB) is 100V, then the voltage FB and the reference voltage value are The difference between the two produces a relatively strong drive signal DRV, causing the operating drive current of the illuminating source 214 to increase to produce a higher brightness, as in the case, if By operation of the drive current of light source 214 is too large, the voltage comparator 235 generates a drive signal DRV is relatively weak, causing the work light source driving current 214 is reduced.

[0047] 因此，可在电流控制器 260中设置工作温度感测器 224感测发光光源 214的工作温度，电流控制器 260根据工作温度自动选择对应的数字参考值 226，并据以调整工作驱动电流。 Therefore, the operating temperature sensor 224 can be set in the current controller 260 to sense the operating temperature of the illuminating light source 214, and the current controller 260 automatically selects the corresponding digital reference value 226 according to the operating temperature, and adjusts the working drive accordingly. Current.

[0048] 请参阅图 9，显示***，包括：显示装置及电流控制器 260，显示装置为液晶显示装置，其具有至少一发光光源 214，而至少一发光光源 214包括数个串连 LED 242 (l)-(n) , LED 242 (l)-(n)可以串连连接，并联连接，或串连与并联组合方式连接，发光光源 214可以包括用于 LCD***的背光光源，例如用于小型 LCD*** 的 LED背光光源， LED背光光源可以包括各种 LED, 例如白光 LED, 彩色 LED及有机 LED(OLED)等。另外，电流控制器 260，连接至少一发光光源 214，而电流控制器 260包括：工作温度感测器 224、存储装置 220、数模转换器 222、比较器 2 35及电流调节器 212。工作温度感测器 224感测发光光源 214的工作温度。存储装置 220，连接工作温度感测器 224，被配置为存储分别对应不同工作温度的多个数字参考值 226，其中每个数字参考值 226对应至少一发光光源 214的预定驱动电流，数字参考值可以由仿真发光光源 214所需操作条件而得。例如，如果发光光源 214的亮度与流经发光光源 214的驱动电流成正比，则对应发光光源 214所需亮度的较佳驱动电流值可以由仿真发光光源 214所需亮度的操作条件而得，然后较佳驱动电流值可以利用模拟对数字转换器转换成数字参考值并且储存于存储装置 220中，由于发光光源 214在不同的温度下，以相同的工作驱动电流发光光源 2 14，会有不同的亮度，发光光源 214的工作温度越高，会有越亮的亮度，因此需要降低工作驱动电流。数字参考 226即针对不同的工作温度进行不同程度的工作驱动电流的控制。因此，可将发光光源 214的预定驱动电流设定成与工作温度成反比，也就是说，工作温度越高，则预定驱动电流越小，以减少工作驱动电流。数模转换器 222，连接于存储装置 220及用以转换发光光源 214的工作温度的数字参考值 226成第一电参数，例如：数模转换器 222先将数字参考值 226转换成模拟信号并且转呈模拟信号给电流参考单元 232，电流参考单元 232用以产生对应于模拟信号的参考电流信号 (第一电参数)，为了说明起见，电流参考单元 232显示为独立的单元，然而，电流参考单元 232可以合并成数模转换器 222，例如，数模转换器 222可以用以将数字参考值 226转换成第一电参数。比较器 237为电流比较器 237，通过电流参考单元 232电性连接于数模转换器 222，并用以比较第一电参数 (如：参考电流值)与对应发光光源 214的工作驱动电流的第二电参数 (如：反馈电流值)，并产生对应二输入电流差值的驱动信号 DRV (如：驱动偏置电流），及电流调节器 212连接比较器 235及根据驱动偏置电流调整至少一发光光源 214 的工作驱动电流，在本实施例中，电流调节器 212包括金属氧化物半导体（MOS )晶体管 240， MOS晶体管 240用以调整发光光源 214的工作驱动电流， MOS晶体管 240的栅极端与电流比较器 237连接，并且接收驱动信号 DRV，而 MOS晶体管 2 40的源极端接地， MOS晶体管 240的漏极端进一步经二极管 D连接发光光源 214，二极管 D还经旁路电容器 C接地，二极管 D用以保护发光光源 214避免控制器 260 故障，及用以不想要的高频率电流引流经旁路电容器 C接地。 Referring to FIG. 9, a display system includes: a display device and a current controller 260. The display device is a liquid crystal display device having at least one illuminating light source 214, and the at least one illuminating light source 214 includes a plurality of serially connected LEDs 242 ( L)-(n), LED 242 (l)-(n) may be connected in series, in parallel, or in series and in parallel, and the light source 214 may include a backlight source for the LCD system, for example for small LED backlight source for LCD system, LED backlight source can include various LEDs, such as white LED, color LED and Organic LED (OLED), etc. In addition, the current controller 260 is connected to at least one illuminating light source 214, and the current controller 260 includes: an operating temperature sensor 224, a storage device 220, a digital to analog converter 222, a comparator 235, and a current regulator 212. The operating temperature sensor 224 senses the operating temperature of the illuminating light source 214. The storage device 220 is connected to the operating temperature sensor 224 and configured to store a plurality of digital reference values 226 respectively corresponding to different operating temperatures, wherein each of the digital reference values 226 corresponds to a predetermined driving current of the at least one illuminating source 214, and the digital reference value It can be derived from the operating conditions required to simulate the illumination source 214. For example, if the brightness of the illuminating source 214 is proportional to the drive current flowing through the illuminating source 214, the preferred drive current value corresponding to the desired brightness of the illuminating source 214 may be derived from the operating conditions that simulate the desired brightness of the illuminating source 214, and then The preferred driving current value can be converted into a digital reference value by using an analog-to-digital converter and stored in the storage device 220. Since the illuminating light source 214 is driven at the same temperature and at the same temperature, the illuminating source 2 14 will be different. Brightness, the higher the operating temperature of the illuminating light source 214, the brighter the brightness, and therefore the operating drive current needs to be reduced. The digital reference 226 performs different degrees of control of the working drive current for different operating temperatures. Therefore, the predetermined driving current of the illuminating light source 214 can be set to be inversely proportional to the operating temperature, that is, the higher the operating temperature, the smaller the predetermined driving current to reduce the operating driving current. The digital-to-analog converter 222 is connected to the storage device 220 and the digital reference value 226 for converting the operating temperature of the illuminating light source 214 into a first electrical parameter. For example, the digital-to-analog converter 222 first converts the digital reference value 226 into an analog signal and The analog signal is forwarded to the current reference unit 232, and the current reference unit 232 is configured to generate a reference current signal (first electrical parameter) corresponding to the analog signal. For the sake of explanation, the current reference unit 232 is shown as a separate unit, however, the current reference Unit 232 can be combined into a digital to analog converter 222, for example, digital to analog converter 222 can be used to convert digital reference value 226 to a first electrical parameter. The comparator 237 is a current comparator 237, and is electrically connected to the digital-to-analog converter 222 through the current reference unit 232, and is configured to compare the first electrical parameter (eg, the reference current value) with the second working operating current of the corresponding illuminating source 214. Electrical parameters (eg, feedback current values), and generate a drive signal DRV corresponding to the difference between the two input currents (eg, drive bias current), and the current regulator 212 is coupled to the comparator 235 and adjusts at least one illumination according to the drive bias current The operating current of the light source 214, in the present embodiment, the current regulator 212 includes a metal oxide semiconductor (MOS) transistor 240 for adjusting the operating drive current of the light source 214, the gate terminal and current of the MOS transistor 240. The comparator 237 is connected, and receives the driving signal DRV, and the source terminal of the MOS transistor 240 is grounded, and the drain terminal of the MOS transistor 240 is further connected to the illuminating light source 214 via the diode D. Diode D is also grounded via a bypass capacitor C for protecting illuminating source 214 from controller 260 failure and for undesired high frequency current draining through bypass capacitor C to ground.

[0049] 在具体应用中，电流控制器还包括检测器 216，检测器 216连接发光光源 214并用以测量第二电参数 (如：反馈电流值)。检测器 216与发光光源 214连接，检测器 216包括感应电阻 Rs及一对 MOS晶体管 252a及 252b。 MOS晶体管 252a及 252b的栅极端接地， MOS晶体管 252b的漏极端与栅极端连接。 MOS晶体管 252a的漏极端与电流比较器 237连接，当流经发光光源 214的驱动电流改变吋，检测器电阻 R s两端上的电压 FB还会随之改变，电压 FB的改变造成 MOS晶体管 252a及 252b的栅极偏置改变，使得流经 MOS晶体管 252a的漏极端的电流改变，当电流比较器 2 37检测到流经 MOS晶体管 252b的电流与参考电流值有差异吋，电流比较器 237即产生对应所述差值的驱动信号 DRV，驱动信号 DRV调整电流调节器 212的驱动电流，例如，发光光源 214的工作温度为 50度，则预定驱动电流为 5A、第一电参数 (参考电压值)为 120V，但此吋发光光源 214的工作驱动电流仅为 3A、第二电参数 ( 电压 FB)为 100V, 则电压 FB [0049] In a particular application, the current controller further includes a detector 216 coupled to the illumination source 214 and configured to measure a second electrical parameter (eg, a feedback current value). Detector 216 is coupled to illuminating source 214, which includes sense resistor Rs and a pair of MOS transistors 252a and 252b. The gate terminals of the MOS transistors 252a and 252b are grounded, and the drain terminal of the MOS transistor 252b is connected to the gate terminal. The drain terminal of the MOS transistor 252a is connected to the current comparator 237. When the driving current flowing through the illuminating light source 214 is changed, the voltage FB across the detector resistor Rs is also changed, and the change of the voltage FB causes the MOS transistor 252a. The gate bias of 252b is changed such that the current flowing through the drain terminal of MOS transistor 252a changes. When current comparator 237 detects that the current flowing through MOS transistor 252b is different from the reference current value, current comparator 237 is A driving signal DRV corresponding to the difference is generated, and the driving signal DRV adjusts a driving current of the current regulator 212. For example, when the operating temperature of the light source 214 is 50 degrees, the predetermined driving current is 5A, and the first electrical parameter (reference voltage value) ) is 120V, but the operating drive current of the illuminating light source 214 is only 3A, and the second electrical parameter (voltage FB) is 100V, then the voltage FB

与参考电压值之间的差值即产生相当强的驱动信号 DRV，造成发光光源 214的工作驱动电流增加，以产生较高的亮度，同理，如果流经发光光源 214的工作驱动电流过大，则电压比较器 235产生相当弱的驱动信号 DRV，造成发光光源 214的工作驱动电流降低。 The difference from the reference voltage value produces a relatively strong drive signal DRV, causing the operating drive current of the illuminating source 214 to increase to produce a higher brightness. Similarly, if the operating drive current flowing through the illuminating source 214 is excessive. Then, the voltage comparator 235 generates a relatively weak drive signal DRV, causing the operating drive current of the illuminating light source 214 to decrease.

[0050] 因此，可在电流控制器 260中设置工作温度感测器 224以感测发光光源 214的工作温度，电流控制器 260根据工作温度自动选择对应的数字参考值 226，并据以调整工作驱动电流。 [0050] Therefore, the operating temperature sensor 224 can be set in the current controller 260 to sense the operating temperature of the illuminating light source 214, and the current controller 260 automatically selects the corresponding digital reference value 226 according to the operating temperature, and adjusts the work accordingly. Drive current.

[0051] 另外，在具体应用中，显示***，可同吋根据环境亮度感测及工作温度感测的结果，来调整工作驱动电流，例如显示***可同吋包括：环境光感测器 223及工作温度感测器 224。环境光感测器 223感测显示装置前方的环境亮度，及工作温度感测器 224感测发光光源 214的工作温度，而存储装置 220连接环境光感测器 22 3及工作温度感测器 224，被配置为存储分别对应不同环境亮度及不同工作温度的多个数字参考值 226，其中每个数字参考值 226对应至少一发光光源 214的预定驱动电流，数字参考值可以由仿真发光光源 214所需操作条件而得。因此，电流控制器 260可根据环境亮度及工作温度自动选择对应的数字参考值 226，并据以调整工作驱动电流。 [0051] In addition, in a specific application, the display system can adjust the working drive current according to the result of the ambient brightness sensing and the working temperature sensing. For example, the display system can include: the ambient light sensor 223 and Operating temperature sensor 224. The ambient light sensor 223 senses the ambient brightness in front of the display device, and the operating temperature sensor 224 senses the operating temperature of the light source 214, and the storage device 220 connects the ambient light sensor 22 and the operating temperature sensor 224. And configured to store a plurality of digital reference values 226 corresponding to different ambient brightnesses and different operating temperatures, wherein each digital reference value 226 corresponds to a predetermined driving current of the at least one illuminating light source 214, and the digital reference value may be used by the simulated illuminating light source 214 Need to operate the conditions. Therefore, current The controller 260 can automatically select a corresponding digital reference value 226 according to the ambient brightness and the operating temperature, and adjust the working drive current accordingly.

[0052] 请参阅图 10，本实施例中，以特定顺序执行各步骤，然而，若以适当电路执行吋，上述步骤可以不限所述特定顺序执行，可以任何顺序同吋进行或依次进行。首先，步骤 412，感测对应发光光源的工作温度的工作温度感测器，并转换工作温度为数字参考值，其中数字参考值对应发光光源的预定驱动电流。步骤 422 ，然后转换数字参考值成第一电参数（电压或电流）。步骤 432，测量对应发光光源的工作驱动电流的第二电参数（电压或电流）。步骤 442，比较第一电参数与第二电参数。接着，步骤 452，判断所测得的第一电参数与第二电参数之间是否有差异。若有差异，则执行步骤 462，根据比较结果产生驱动偏置电流，以调整发光光源的工作驱动电流，并重复执行步骤 431至 461，直至第一电参数与第二电参数之间无差异吋，则结束。 Referring to FIG. 10, in the present embodiment, the steps are performed in a specific order. However, if executed in an appropriate circuit, the above steps may be performed in any specific order, and may be performed in any order or sequentially. First, in step 412, a working temperature sensor corresponding to the operating temperature of the illuminating light source is sensed, and the switching operating temperature is a digital reference value, wherein the digital reference value corresponds to a predetermined driving current of the illuminating light source. Step 422, and then converting the digital reference value into a first electrical parameter (voltage or current). Step 432: Measure a second electrical parameter (voltage or current) corresponding to the working drive current of the illuminating light source. Step 442, comparing the first electrical parameter with the second electrical parameter. Next, in step 452, it is determined whether there is a difference between the measured first electrical parameter and the second electrical parameter. If there is a difference, step 462 is performed to generate a driving bias current according to the comparison result to adjust the working driving current of the illuminating light source, and steps 431 to 461 are repeatedly performed until there is no difference between the first electrical parameter and the second electrical parameter. , then it ends.

[0053] 请参阅图 11，显示***，包括：显示装置及电流控制器 260，显示装置可为液晶显示装置，其具有至少一发光光源 214，而至少一发光光源 214可包括数个串连 LED 242 (l)-(n)， LED 242 (l)-(n)可以串连连接，并联连接，或串连与并联组合方式连接，发光光源 214可以包括用于 LCD***的背光光源，例如用于小型 LC D***的 LED背光光源， LED背光光源可以包括各种 LED, 例如白光 LED, 彩色 LED及有机 LED ( OLED )等。另外，电流控制器 260，连接至少一发光光源 214 ，而电流控制器 260包括：使用条件 225、第一存储装置 220、第一数模转换器 22 2、第二存储装置 253、第二数模转换器 254、比较器 235、光感测器 251及电流调节器 212。使用条件 225可以包括感测发光光源 214的工作温度、发光光源 214的总点亮吋间、显示装置前方的环境亮度。第一存储装置 220，连接使用条件 225 ，被配置为存储分别对应不同使用条件 225的多个第一数字参考值 226，其中每个第一数字参考值 226对应至少一发光光源 214的预定驱动电流，第一数字参考值 226可以由仿真发光光源 214所需操作条件而得。例如，如果发光光源 214的亮度与流经发光光源 214的驱动电流成正比，则对应发光光源 214所需亮度的较佳驱动电流值可以由仿真发光光源 214所需亮度的操作条件而得，然后较佳驱动电流值可以利用模拟对数字转换器转换成第一数字参考值并且储存于第一存储装置 220中，由于在不同使用条件 225下，发光光源 214会有不同的亮度、工作驱动电流等需求，因此需要调整发光光源 214的工作驱动电流。第一数字参考 226即针对不同的使用条件 225进行不同程度的工作驱动电流的控制。第一数模转换器 222，连接于第一存储装置 220及用以转换发光光源 214的工作温度的第一数字参考值 226成第一电参数，例如：第一数模转换器 222先将第一数字参考值 226转换成模拟信号并且转呈模拟信号给第一电压参考单元 230，第一电压参考单元 230 用以产生对应于模拟信号的参考电压信号 (第一电参数)，为了说明起见，第一电压参考单元 230显示为独立的单元，然而，第一电压参考单元 230可以合并成第一数模转换器 222，例如，第一数模转换器 222可以用以将第一数字参考值 226转换成第一电参数。另外，相同的，光感测器 251可以感测发光光源 214的亮度。第二存储装置 252，连接光感测器 251，被配置为存储分别对应不同发光光源 214 的亮度的多个第二数字参考值 253，其中每个第二数字参考值 253对应至少一发光光源 214的工作驱动电流，第二数字参考值 253可以由仿真发光光源 214所需操作条件而得。例如，如果发光光源 214的亮度与流经发光光源 214的工作驱动电流成正比，则对应发光光源 214的亮度的工作驱动电流值可以由仿真发光光源 21 4的操作条件而得，然后工作驱动电流值可以利用模拟对数字转换器转换成数字参考值 253并且储存于第二存储装置 252中。第二数模转换器 254，连接于第二存储装置 252及用以转换发光光源 214的亮度的第二数字参考值 253成第二电参数，例如：第二数模转换器 222先将第二数字参考值 253转换成模拟信号并且转呈模拟信号给第二电压参考单元 255，第二电压参考单元 255用以产生对应于模拟信号的第二电参数，为了说明起见，第二电压参考单元 255显示为独立的单元，然而，第二电压参考单元 255可以合并成第二数模转换器 254，例如，第二数模转换器 254可以用以将第二数字参考值 253转换成第二电参数。比较器 235为电压比较器 235，通过第一电压参考单元 230电性连接于第一数模转换器 222及通过第二电压参考单元 255电性连接于第二数模转换器 254，并用以比较第一电参数 (如：参考电压值)与第二电参数 (如：反馈电压值)，并产生对应二输入电压差值的驱动信号 DRV (如：驱动偏置电流)，及电流调节器 212连接比较器 235及根据驱动偏置电流调整至少一发光光源 214的工作驱动电流，在本实施例中，电流调节器 21 2包括金属氧化物半导体（MOS)晶体管 240， MOS晶体管 240用以调整发光光源 2 14的工作驱动电流， MOS晶体管 240的栅极端与电压比较器 235连接，并且接收驱动信号 DRV，而 MOS晶体管 240的源极端接地， MOS晶体管 240的漏极端进一步经二极管 D连接发光光源 214，二极管 D还经旁路电容器 C接地，二极管 D用以保护发光光源 214避免控制器 260故障，及用以不想要的高频率电流引流经旁路电容器 C接地。 Referring to FIG. 11, a display system includes: a display device and a current controller 260. The display device can be a liquid crystal display device having at least one illuminating light source 214, and at least one illuminating light source 214 can include a plurality of serial LEDs. 242 (l)-(n), LED 242 (l)-(n) may be connected in series, in parallel, or in series and in parallel, and the light source 214 may include a backlight source for the LCD system, for example For LED backlight sources in small LC D systems, LED backlight sources can include a variety of LEDs, such as white LEDs, color LEDs, and organic LEDs (OLEDs). In addition, the current controller 260 is connected to at least one illuminating light source 214, and the current controller 260 includes: a use condition 225, a first storage device 220, a first digital to analog converter 22, a second storage device 253, and a second digital mode. Converter 254, comparator 235, photo sensor 251, and current regulator 212. The use condition 225 can include sensing the operating temperature of the illuminating light source 214, the total lighting time of the illuminating light source 214, and the ambient brightness in front of the display device. The first storage device 220, the connection use condition 225, is configured to store a plurality of first digital reference values 226 respectively corresponding to different usage conditions 225, wherein each of the first digital reference values 226 corresponds to a predetermined driving current of the at least one illumination source 214 The first digital reference value 226 can be derived from the desired operating conditions of the simulated illumination source 214. For example, if the brightness of the illuminating source 214 is proportional to the drive current flowing through the illuminating source 214, the preferred drive current value corresponding to the desired brightness of the illuminating source 214 may be derived from the operating conditions that simulate the desired brightness of the illuminating source 214, and then The preferred drive current value can be converted to the first digital reference value using the analog to digital converter and stored in the first storage device In the case of 220, since the illuminating light source 214 has different brightness, working drive current and the like under different use conditions 225, it is necessary to adjust the working drive current of the illuminating light source 214. The first digital reference 226 performs different degrees of control of the working drive current for different usage conditions 225. The first digital-to-analog converter 222 is connected to the first storage device 220 and the first digital reference value 226 for converting the operating temperature of the illuminating light source 214 into a first electrical parameter, for example: the first digital-to-analog converter 222 first A digital reference value 226 is converted into an analog signal and converted to an analog signal to the first voltage reference unit 230. The first voltage reference unit 230 is configured to generate a reference voltage signal (first electrical parameter) corresponding to the analog signal. For the sake of explanation, The first voltage reference unit 230 is shown as a separate unit. However, the first voltage reference unit 230 may be combined into a first digital to analog converter 222. For example, the first digital to analog converter 222 may be configured to use the first digital reference value 226. Converted to the first electrical parameter. In addition, the same, the photo sensor 251 can sense the brightness of the illuminating light source 214. The second storage device 252 is connected to the photo sensor 251 and configured to store a plurality of second digital reference values 253 respectively corresponding to the brightness of the different illumination sources 214, wherein each of the second digital reference values 253 corresponds to the at least one illumination source 214 The operational drive current, the second digital reference 253, can be derived from the desired operating conditions of the simulated illumination source 214. For example, if the brightness of the illuminating source 214 is proportional to the operating drive current flowing through the illuminating source 214, the value of the operating drive current corresponding to the brightness of the illuminating source 214 can be derived from the operating conditions of the emulated illuminating source 214, and then the operating drive current The value can be converted to a digital reference value 253 using an analog to digital converter and stored in the second storage device 252. The second digital-to-analog converter 254 is connected to the second storage device 252 and the second digital reference value 253 for converting the brightness of the illuminating light source 214 into a second electrical parameter. For example, the second digital-to-analog converter 222 first performs the second The digital reference value 253 is converted into an analog signal and converted to an analog signal to the second voltage reference unit 255. The second voltage reference unit 255 is configured to generate a second electrical parameter corresponding to the analog signal. For the sake of explanation, the second voltage reference unit 255 Displayed as separate units, however, the second voltage reference unit 255 can be combined into a second digital to analog converter 254, for example, the second digital to analog converter 254 can be used to convert the second digital reference value 253 into a second electrical parameter. . The comparator 235 is a voltage comparator 235, is electrically connected to the first digital-to-analog converter 222 through the first voltage reference unit 230, and is electrically connected to the second digital-to-analog converter 254 through the second voltage reference unit 255, and is used for comparison. a first electrical parameter (eg, a reference voltage value) and a second electrical parameter (eg, a feedback voltage value), and a drive signal DRV (eg, a drive bias current) corresponding to a difference between the two input voltages, and a current regulator 212 Connecting the comparator 235 and adjusting the working drive current of the at least one illuminating source 214 according to the driving bias current. In the embodiment, the current regulator 21 2 includes a metal oxide semiconductor (MOS) transistor 240 for adjusting the operating drive current of the illuminating light source 214, the gate terminal of the MOS transistor 240 is connected to the voltage comparator 235, and receives the driving signal DRV, and the MOS transistor 240 The source is extremely grounded. The drain terminal of the MOS transistor 240 is further connected to the illuminating light source 214 via the diode D. The diode D is also grounded via the bypass capacitor C. The diode D is used to protect the illuminating source 214 from malfunction of the controller 260, and is used for unwanted The high frequency current is drained through the bypass capacitor C to ground.

[0054] 在具体应用中，电压比较器 235接收第二电参数 (如：反馈电压值)并且将与来自第一电压参考单元 230的第一电参数 (如：参考电压值)进行比较，并产生 MOS晶体管 240的栅极端的驱动信号 DRV，驱动信号 DRV根据电压 FB与参考电压值之间的差值驱动 MOS晶体管 240的栅极端， MOS晶体管 240根据驱动信号 DRV调整发光光源 214的工作驱动电流，例如，使用条件 225为显示装置前方的环境亮度，若显示装置前方的环境亮度为 200nits，则预定驱动电流为 5A、第一电参数 (参考电压值)为 120V，但此吋光感测器 251感测发光光源 214的亮度为 100nits，亮度为 lOOnits对应的工作驱动电流仅为 3A、第二电参数 (反馈电压值)为 100V，则第一电参数与第二电参数之间的差值即产生相当强的驱动信号 _DRV，造成发光光源[0054] In a particular application, voltage comparator 235 receives a second electrical parameter (eg, a feedback voltage value) and will compare with a first electrical parameter (eg, a reference voltage value) from first voltage reference unit 230, and The drive signal DRV of the gate terminal of the MOS transistor 240 is generated, the drive signal DRV drives the gate terminal of the MOS transistor 240 according to the difference between the voltage FB and the reference voltage value, and the MOS transistor 240 adjusts the working drive current of the illuminating light source 214 according to the drive signal DRV. For example, the use condition 225 is the ambient brightness in front of the display device. If the ambient brightness in front of the display device is 200 nits, the predetermined drive current is 5 A, and the first electrical parameter (reference voltage value) is 120 V, but the neon sensor 251 senses that the brightness of the illuminating light source 214 is 100 nits, the working current of the brightness of 100 ns is only 3 A, and the second electrical parameter (feedback voltage value) is 100 V, then the difference between the first electrical parameter and the second electrical parameter That is, a relatively strong driving signal _DRV is generated, resulting in an illuminating light source.

214的工作驱动电流增加，以产生较高的背光，同理，如果发光光源 214的亮度过亮，对应的工作驱动电流过大，则电压比较器 235产生相当弱的驱动信号 DRV ，降低发光光源 214的工作驱动电流。 The working drive current of 214 is increased to generate a higher backlight. Similarly, if the brightness of the illuminating light source 214 is too bright and the corresponding working driving current is too large, the voltage comparator 235 generates a relatively weak driving signal DRV, reducing the illuminating source. 214 works to drive current.

[0055] 因此，可在电流控制器 260中设置使用条件 225，电流控制器 260根据使用条件 2 25自动选择对应的数字参考值 226，以及不量测发光光源 214的工作驱动电流，而是设置光感测器 251，直接感测光亮度，以避免在相同电流下因总点亮吋间或不同工作温度造成的亮度落差，使得调整工作驱动电流更为精确。 [0055] Therefore, the use condition 225 can be set in the current controller 260, and the current controller 260 automatically selects the corresponding digital reference value 226 according to the use condition 2 25, and does not measure the working drive current of the illumination source 214, but sets The photo sensor 251 directly senses the brightness of the light to avoid a brightness drop caused by the total lighting time or different operating temperatures at the same current, so that the adjustment of the working drive current is more accurate.

[0056] 请参阅图 12，显示***，包括：显示装置及电流控制器 260，显示装置可为液晶显示装置，其具有至少一发光光源 214，而至少一发光光源 214可包括数个串连 LED 242 (l)-(n)， LED 242 (l)-(n)可以串连连接，并联连接，或串连与并联组合方式连接，发光光源 214可以包括用于 LCD***的背光光源，例如用于小型 LC D***的 LED背光光源， LED背光光源可以包括各种 LED, 例如白光 LED, 彩色 LED及有机 LED ( OLED )等。另外，电流控制器 260，连接至少一发光光源 214 ，而电流控制器 260包括：使用条件 225、第一存储装置 220、第一数模转换器 22 2、第二存储装置 253、第二数模转换器 254、比较器 235、光感测器 251及电流调节器 212。使用条件 225可以包括感测发光光源 214的工作温度、发光光源 214的总点亮吋间、显示装置前方的环境亮度。第一存储装置 220，连接使用条件 225 ，被配置为存储分别对应不同用条件 225的多个第一数字参考值 226，其中每个第一数字参考值 226对应至少一发光光源 214的预定驱动电流，第一数字参考值可以由仿真发光光源 214所需操作条件而得。例如，如果发光光源 214的亮度与流经发光光源 214的驱动电流成正比，则对应发光光源 214所需亮度的较佳驱动电流值可以由仿真发光光源 214所需亮度的操作条件而得，然后较佳驱动电流值可以利用模拟对数字转换器转换成第一数字参考值并且储存于第一存储装置 220 中，由于在不同使用条件 225下，发光光源 214会有不同的亮度、工作驱动电流等需求，因此需要调整发光光源 214的工作驱动电流。第一数字参考 226即针对不同的使用条件 225进行不同程度的工作驱动电流的控制。第一数模转换器 222 ，连接于第一存储装置 220及用以转换发光光源 214的工作温度的第一数字参考值 226成第一电参数，例如：第一数模转换器 222先将第一数字参考值 226转换成模拟信号并且转呈模拟信号给给第一电流参考单元 232，第一电流参考单元 232 用以产生对应于模拟信号的参考电流信号 (第一电参数)，为了说明起见，第一电流参考单元 232显示为独立的单元，然而，第一电流参考单元 232可以合并成第一数模转换器 222，例如，第一数模转换器 222可以用以将数字参考值 226转换成第一电参数。另外，相同的，光感测器 251可以感测发光光源 214的亮度。第二存储装置 252，连接光感测器 251，被配置为存储分别对应不同发光光源 214的亮度的多个第二数字参考值 253，其中每个第二数字参考值 253对应至少一发光光源 214的工作驱动电流，第二数字参考值 253可以由仿真发光光源 214所需操作条件而得。例如，如果发光光源 214的亮度与流经发光光源 214的工作驱动电流成正比，则对应发光光源 214的亮度的工作驱动电流值可以由仿真发光光源 214的操作条件而得，然后工作驱动电流值可以利用模拟对数字转换器转换成数字参考值 253并且储存于第二存储装置 252中。第二数模转换器 254，连接于第二存储装置 252及用以转换发光光源 214的亮度的第二数字参考值 253成第二电参数，例如：第二数模转换器 222先将第二数字参考值 253转换成模拟信号并且转呈模拟信号给第二电流参考单元 256，第二电流参考单元 256用以产生对应于模拟信号的第二电参数，为了说明起见，第二电压参考单元 256显示为独立的单元，然而，第二电压参考单元 256可以合并成第二数模转换器 254，例如，第二数模转换器 254可以用以将第二数字参考值 253转换成第二电参数。比较器 237为电流比较器 237，通过第一电流参考单元 232电性连接于第一数模转换器 222及通过第二电压参考单元 256电性连接于第二数模转换器 254，并用以比较第一电参数 (如：参考电流值)与第二电参数 (如：反馈电流值)，并产生对应二输入电流差值的驱动信号 DRV (如：驱动偏置电流)，及电流调节器 212连接比较器 235及根据驱动偏置电流调整至少一发光光源 214的工作驱动电流，在本实施例中，电流调节器 212 包括金属氧化物半导体（MOS)晶体管 240， MOS晶体管 240用以调整发光光源 21 4的工作驱动电流， MOS晶体管 240的栅极端与电流比较器 237连接，并且接收驱动信号 DRV，而 MOS晶体管 240的源极端接地， MOS晶体管 240的漏极端进一步经二极管 D连接发光光源 214，二极管 D还经旁路电容器 C接地，二极管 D用以保护发光光源 214避免控制器 260故障，及用以不想要的高频率电流引流经旁路电容器 C接地。 Referring to FIG. 12, a display system includes: a display device and a current controller 260. The display device can be a liquid crystal display device having at least one illumination source 214, and the at least one illumination source 214 can include a plurality of serial LEDs. 242 (l)-(n), LED 242 (l)-(n) may be connected in series, in parallel, or in series and in parallel, and the light source 214 may include a backlight source for the LCD system, for example For LED backlight sources in small LC D systems, LED backlight sources can include a variety of LEDs, such as white LEDs, color LEDs, and organic LEDs (OLEDs). In addition, the current controller 260 is connected to the at least one illuminating light source 214. The current controller 260 includes: a use condition 225, a first storage device 220, a first digital to analog converter 22, a second storage device 253, a second digital to analog converter 254, a comparator 235, and a photo sensor 251. And a current regulator 212. The use condition 225 can include sensing the operating temperature of the illuminating light source 214, the total lighting time of the illuminating light source 214, and the ambient brightness in front of the display device. The first storage device 220, the connection use condition 225, is configured to store a plurality of first digital reference values 226 respectively corresponding to the different use conditions 225, wherein each of the first digital reference values 226 corresponds to a predetermined drive current of the at least one illumination source 214 The first digital reference value can be derived from the desired operating conditions of the simulated illumination source 214. For example, if the brightness of the illuminating source 214 is proportional to the drive current flowing through the illuminating source 214, the preferred drive current value corresponding to the desired brightness of the illuminating source 214 may be derived from the operating conditions that simulate the desired brightness of the illuminating source 214, and then The preferred drive current value can be converted to the first digital reference value by the analog to digital converter and stored in the first storage device 220. Since the different illumination conditions 225, the illumination source 214 will have different brightness, working drive current, etc. Therefore, it is necessary to adjust the working drive current of the illuminating light source 214. The first digital reference 226 performs different degrees of control of the working drive current for different usage conditions 225. The first digital-to-analog converter 222 is connected to the first storage device 220 and the first digital reference value 226 for converting the operating temperature of the illuminating light source 214 into a first electrical parameter, for example: the first digital-to-analog converter 222 first A digital reference value 226 is converted into an analog signal and converted to an analog signal to the first current reference unit 232. The first current reference unit 232 is configured to generate a reference current signal (first electrical parameter) corresponding to the analog signal, for the sake of explanation. The first current reference unit 232 is shown as a separate unit. However, the first current reference unit 232 can be combined into a first digital-to-analog converter 222. For example, the first digital-to-analog converter 222 can be used to convert the digital reference value 226. Into the first electrical parameter. In addition, the same, the photo sensor 251 can sense the brightness of the illuminating light source 214. The second storage device 252 is connected to the photo sensor 251 and configured to store a plurality of second digital reference values 253 respectively corresponding to the brightness of the different illumination sources 214, wherein each of the second digital reference values 253 corresponds to the at least one illumination source 214 The operational drive current, the second digital reference 253, can be derived from the desired operating conditions of the simulated illumination source 214. For example, if the brightness of the illuminating source 214 is proportional to the operating drive current flowing through the illuminating source 214, the value of the operating drive current corresponding to the brightness of the illuminating source 214 can be derived from the operating conditions of the emulated illuminating source 214, and then the operating drive current value The analog to digital converter can be converted to a digital reference value 253 and stored in the second storage device 252. The second digital-to-analog converter 254 is connected to the second storage device 252 and the second digital reference value 253 for converting the brightness of the illuminating light source 214 into a second electrical parameter. For example, the second digital-to-analog converter 222 first converts the second digital reference value 253 into an analog signal and converts the analog signal to the second current reference unit 256, and the second current reference unit 256 is configured to generate a second corresponding to the analog signal. Electrical parameters, for illustrative purposes, the second voltage reference unit 256 is shown as a separate unit, however, the second voltage reference unit 256 can be combined into a second digital to analog converter 254, for example, the second digital to analog converter 254 can be used The second digital reference value 253 is converted to a second electrical parameter. The comparator 237 is a current comparator 237. The first current reference unit 232 is electrically connected to the first digital-to-analog converter 222 and the second voltage reference unit 256 is electrically connected to the second digital-to-analog converter 254 for comparison. a first electrical parameter (eg, a reference current value) and a second electrical parameter (eg, a feedback current value), and a drive signal DRV (eg, a drive bias current) corresponding to a difference between the two input currents, and a current regulator 212 The comparator 235 is connected and the operating current of the at least one illuminating source 214 is adjusted according to the driving bias current. In the embodiment, the current regulator 212 includes a metal oxide semiconductor (MOS) transistor 240, and the MOS transistor 240 is used to adjust the illuminating source. The working current of the MOS transistor 240 is connected to the current comparator 237, and the driving signal DRV is received, and the source terminal of the MOS transistor 240 is grounded, and the drain terminal of the MOS transistor 240 is further connected to the illuminating light source 214 via the diode D. Diode D is also grounded via bypass capacitor C, which is used to protect illuminating source 214 from controller 260 failure and to use unwanted high frequency power. The flow is drained through the bypass capacitor C to ground.

[0057] 在具体应用中，当电流比较器 237检测到第二电参数与第一电参数有差异吋，电流比较器 237即产生对应所述差值的驱动信号 DRV，驱动信号 DRV调整电流调节器 212的驱动电流，例如，使用条件 225为显示装置前方的环境亮度，若显示装置前方的环境亮度为 200nits，则预定驱动电流为 5A、第一电参数 (参考电流值) 为 5A，但此吋光感测器 251感测发光光源 214的亮度为 100nits，亮度为 lOOnits对应的工作驱动电流仅为 3A、第二电参数 (反馈电流值)为 3A，则第一电参数与第二电参数之间的差值即产生相当强的驱动信号 DRV，造成发光光源 214的工作驱动电流增加，以产生较高的背光，同理，如果发光光源 214的亮度过亮，对应的工作驱动电流过大，则电流比较器 237产生相当弱的驱动信号 DRV，降低发光光源 214的工作驱动电流。 [0057] In a specific application, when the current comparator 237 detects that the second electrical parameter is different from the first electrical parameter, the current comparator 237 generates a driving signal DRV corresponding to the difference, and the driving signal DRV adjusts the current adjustment. The driving current of the device 212, for example, the use condition 225 is the ambient brightness in front of the display device. If the ambient brightness in front of the display device is 200 nits, the predetermined drive current is 5 A, and the first electrical parameter (reference current value) is 5 A, but this The brightness sensor 251 senses that the brightness of the light source 214 is 100 nits, the working drive current corresponding to the brightness of 100 nits is only 3 A, and the second electrical parameter (feedback current value) is 3 A, then the first electrical parameter and the second electrical parameter The difference between the two produces a relatively strong drive signal DRV, causing the operating drive current of the illuminating source 214 to increase to produce a higher backlight. Similarly, if the brightness of the illuminating source 214 is too bright, the corresponding working drive current is too large. Then, the current comparator 237 generates a relatively weak drive signal DRV, which reduces the operating drive current of the illuminating light source 214.

[0058] 因此，可在电流控制器 260中设置使用条件 225，电流控制器 260根据使用条件 2 25自动选择对应的数字参考值 226，以及不量测发光光源 214的工作驱动电流，而是设置光感测器 251，直接感测光亮度，以避免在相同电流下因总点亮吋间或不同工作温度造成的亮度落差，通过感测光亮度取得对应的工作驱动电流，使得调整工作驱动电流更为精确。 [0058] Therefore, the use condition 225 can be set in the current controller 260, the current controller 260 automatically selects the corresponding digital reference value 226 according to the use condition 2 25, and does not measure the working drive current of the illuminating light source 214, Instead, the photo sensor 251 is disposed to directly sense the brightness of the light to avoid a brightness drop caused by the total lighting time or different operating temperatures at the same current, and obtain a corresponding working driving current by sensing the brightness, so that the adjustment work is performed. The drive current is more accurate.

[0059] 请参阅图 13，本实施例中，以特定顺序执行各步骤，然而，若以适当电路执行吋，上述步骤可以不限所述特定顺序执行，可以任何顺序同吋进行或依次进行。首先，步骤 413，转换使用条件为第一数字参考值，其中第一数字参考值对应发光光源的预定驱动电流。步骤 423，然后转换数字参考值成第一电参数（电压或电流）。步骤 433，感测对应发光光源的亮度，并转换发光光源的亮度为第二数字参考值，接着转换第二数字参考值成第二电参数（电压或电流），其中第二数字参考值对应发光光源的工作驱动电流。步骤 443，比较第一电参数与第二电参数。接着，步骤 453，判断所测得的第一电参数与第二电参数之间是否有差异。若有差异，则执行步骤 463，根据比较结果产生驱动偏置电流，以调整发光光源的工作驱动电流，并重复执行步骤 433至 463，直至第一电参数与第二电参数之间无差异吋，则结束。 Referring to FIG. 13, in this embodiment, the steps are performed in a specific order. However, if executed in an appropriate circuit, the above steps may be performed in any specific order, and may be performed in any order or sequentially. First, in step 413, the conversion use condition is a first digital reference value, wherein the first digital reference value corresponds to a predetermined driving current of the illuminating light source. Step 423, then converting the digital reference value to a first electrical parameter (voltage or current). Step 433, sensing brightness of the corresponding illuminating light source, and converting the brightness of the illuminating light source to a second digital reference value, and then converting the second digital reference value to a second electrical parameter (voltage or current), wherein the second digital reference value corresponds to illuminating The working drive current of the light source. Step 443: Compare the first electrical parameter with the second electrical parameter. Next, in step 453, it is determined whether there is a difference between the measured first electrical parameter and the second electrical parameter. If there is a difference, step 463 is performed, and a driving bias current is generated according to the comparison result to adjust the working driving current of the illuminating light source, and steps 433 to 463 are repeatedly performed until there is no difference between the first electrical parameter and the second electrical parameter. , then it ends.

[0060] 基于上述，本申请提供依据不同使用条件来控制液晶显示***内发光光源的工作驱动电流的方法及装置。另，本申请除了可以采量测发光光源 214的工作驱动电流外，亦可不量测发光光源 214的工作驱动电流，而是设置光感测器 251，直接感测光亮度取得对应的工作驱动电流，以避免在相同电流下因总点亮吋间或不同工作温度造成的亮度落差，通过感测光亮度取得对应的工作驱动电流，使得调整工作驱动电流更为精确。 Based on the above, the present application provides a method and apparatus for controlling the operating drive current of a light source in a liquid crystal display system according to different usage conditions. In addition, in addition to measuring the working driving current of the illuminating light source 214, the present application may not measure the working driving current of the illuminating light source 214, but set the photo sensor 251 to directly sense the brightness to obtain the corresponding working driving current. In order to avoid the brightness drop caused by the total lighting time or different working temperature at the same current, the corresponding working driving current is obtained by sensing the brightness, so that the adjustment working driving current is more accurate.

[0061] 需要说明的是，在上述实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详细描述的部分，可以参见其他实施例的相关描述。 [0061] It should be noted that, in the foregoing embodiments, the descriptions of the various embodiments are different, and the parts that are not described in detail in an embodiment may refer to related descriptions of other embodiments.

[0062] 以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到各种等效的修改或替换，这些修改或替换都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以权利要求的保护范围为准。 The above is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of various kinds within the technical scope disclosed by the present application. Equivalent modifications or substitutions are intended to be included within the scope of the present application. Therefore, the scope of protection of this application shall be subject to the scope of protection of the claims.

Claims

权利要求书 Claim

[权利要求 1] 一种显示***，其特征在于，包括： [Claim 1] A display system, comprising:

显示装置，具有至少一个发光光源；以及 a display device having at least one illuminating light source;

电流控制器，连接所述至少一个发光光源，所述电流控制器包括：计吋器，计算所述至少一个发光光源的总点亮吋间； a current controller, connected to the at least one illuminating light source, the current controller comprising: a meter, calculating a total lighting time of the at least one illuminating light source;

存储装置，连接所述计吋器，被配置为存储分别对应不同总点亮吋间的多个数字参考值，其中每个数字参考值对应所述至少一个发光光源的预定驱动电流； a storage device, coupled to the meter, configured to store a plurality of digital reference values respectively corresponding to different total lighting turns, wherein each digital reference value corresponds to a predetermined driving current of the at least one light emitting source;

数模转换器，连接于所述存储装置及用以转换所述至少一个发光光源的总点亮吋间的数字参考值成第一电参数； a digital-to-analog converter connected to the storage device and a digital reference value for converting the total lighting time of the at least one illuminating light source into a first electrical parameter;

比较器，连接于所述数模转换器并用以比较所述第一电参数与对应所述至少一个发光光源的工作驱动电流的第二电参数，并产生驱动偏置电流；以及 a comparator connected to the digital-to-analog converter and configured to compare the first electrical parameter with a second electrical parameter corresponding to a working drive current of the at least one illuminating light source, and generate a driving bias current;

电流调节器，连接所述比较器及根据所述驱动偏置电流调整所述至少一发光光源的工作驱动电流。 a current regulator that connects the comparator and adjusts a working drive current of the at least one illuminating light source according to the driving bias current.

[权利要求 2] 如权利要求 1所述的显示***，其特征在于，所述比较器为电压比较器。 [Claim 2] The display system according to claim 1, wherein the comparator is a voltage comparator.

[权利要求 3] 如权利要求 2所述的显示***，其特征在于，所述第一电参数为对应所述至少一个发光光源的预定驱动电流的电压。 [Claim 3] The display system according to claim 2, wherein the first electrical parameter is a voltage corresponding to a predetermined driving current of the at least one illuminating light source.

[权利要求 4] 如权利要求 3所述的显示***，其特征在于，所述第二电参数为对应所述至少一个发光光源的工作驱动电流的反馈电压。 [Claim 4] The display system according to claim 3, wherein the second electrical parameter is a feedback voltage corresponding to a working drive current of the at least one illuminating light source.

[权利要求 5] 如权利要求 1所述的显示***，其特征在于，所述比较器为电流比较器。 [Claim 5] The display system according to claim 1, wherein the comparator is a current comparator.

[权利要求 6] 如权利要求 5所述的显示***，其特征在于，所述第一电参数为所述对应至少一个发光光源的预定驱动电流的电流值。 [Claim 6] The display system according to claim 5, wherein the first electrical parameter is a current value of the predetermined driving current corresponding to the at least one illuminating light source.

[权利要求 7] 如权利要求 6所述的显示***，其特征在于，所述第二电参数为对应所述至少一个发光光源的工作驱动电流的反馈电流。 [Claim 7] The display system according to claim 6, wherein the second electrical parameter is a feedback current corresponding to a working drive current of the at least one illuminating light source.

[权利要求 8] 如权利要求 1所述的显示***，其特征在于，所述电流控制器还包括检测器，所述检测器连接所述至少一个发光光源并用以测量所述第二电参数。 [Claim 8] The display system according to claim 1, wherein the current controller further comprises a detector, the detector being coupled to the at least one illuminating light source and configured to measure the second electrical parameter.

[权利要求 9] 如权利要求 1所述的显示***，其特征在于，所述至少一个发光光源的预定驱动电流与总点亮吋间成正比。 [Claim 9] The display system according to claim 1, wherein the predetermined driving current of the at least one illuminating light source is proportional to the total lighting time.

[权利要求 10] 如权利要求 1所述的显示***，其特征在于，所述驱动偏置电流对应所述第一电参数及所述第二电参数之间的差值。 [Claim 10] The display system according to claim 1, wherein the driving bias current corresponds to a difference between the first electrical parameter and the second electrical parameter.

[权利要求 11] 一种显示***的电流驱动方法，其特征在于，包括： [Claim 11] A current driving method of a display system, comprising:

计算对应所述至少一个发光光源的总点亮吋间的计吋器，并转换所述至少一个发光光源的总点亮吋间为数字参考值，其中所述数字参考值对应至少一个发光光源的预定驱动电流； Calculating a meter corresponding to the total lighting time of the at least one illuminating light source, and converting a total lighting time of the at least one illuminating light source to a digital reference value, wherein the digital reference value corresponds to at least one illuminating light source Predetermined drive current;

转换所述数字参考值成第一电参数； Converting the digital reference value into a first electrical parameter;

测量对应所述至少一个发光光源的工作驱动电流的第二电参数；比较所述第一电参数与所述第二电参数，并根据比较结果产生驱动偏置电流；及根据所述驱动偏置电流调整所述至少一个发光光源的工作驱动电流。 Measuring a second electrical parameter corresponding to the working drive current of the at least one illuminating light source; comparing the first electrical parameter with the second electrical parameter, and generating a driving bias current according to the comparison result; and according to the driving offset The current adjusts a working drive current of the at least one illuminating light source.

[权利要求 12] 如权利要求 11所述的方法，其特征在于，所述至少一个发光光源的预定驱动电流与总点亮吋间成正比。 [Clave 12] The method according to claim 11, wherein the predetermined driving current of the at least one illuminating light source is proportional to the total lighting time.

[权利要求 13] 如权利要求 11所述的方法，其特征在于，通过电压比较器來比较所述第一电参数与所述第二电参数。 [Clave 13] The method of claim 11, wherein the first electrical parameter and the second electrical parameter are compared by a voltage comparator.

[权利要求 14] 如权利要求 13所述的方法，其特征在于，所述第一电参数为对应所述至少一个发光光源的预定驱动电流的电压。 [Claim 14] The method according to claim 13, wherein the first electrical parameter is a voltage corresponding to a predetermined driving current of the at least one illuminating light source.

[权利要求 15] 如权利要求 14所述的方法，其特征在于，所述第二电参数为对应所述至少一个发光光源的工作驱动电流的反馈电压。 [Claim 15] The method of claim 14, wherein the second electrical parameter is a feedback voltage corresponding to a working drive current of the at least one illuminating light source.

[权利要求 16] 如权利要求 11所述的方法，其特征在于，通过电流比较器來比较所述第一电参数与所述第二电参数。 [Clave 16] The method of claim 11, wherein the first electrical parameter and the second electrical parameter are compared by a current comparator.

[权利要求 17] 如权利要求 16所述的方法，其特征在于，所述第一电参数为所述对应至少一个发光光源的预定驱动电流的电流值。 [Clave 17] The method according to claim 16, wherein the first electrical parameter is a current value of the predetermined driving current corresponding to the at least one illuminating light source.

[权利要求 18] 如权利要求 17所述的方法，其特征在于，所述第二电参数为对应所述至少一个发光光源的工作驱动电流的反馈电流。 [Claim 18] The method according to claim 17, wherein the second electrical parameter is corresponding to the A feedback current of a working drive current of at least one of the illuminating light sources.

[权利要求 19] 如权利要求 11所述的方法，其特征在于，所述驱动偏置电流对应所述第一及第二电参数的差值。 [Claim 19] The method of claim 11, wherein the driving bias current corresponds to a difference between the first and second electrical parameters.

[权利要求 20] —种显示***的电流驱动方法，其特征在于，包括： [Claim 20] A current driving method for a display system, comprising:

测量对应所述至少一个发光光源的工作驱动电流的第二电参数；比较所述第一电参数与所述第二电参数，并根据比较结果产生驱动偏置电流；及根据所述驱动偏置电流调整所述至少一个发光光源的工作驱动电流； Measuring a second electrical parameter corresponding to the working drive current of the at least one illuminating light source; comparing the first electrical parameter with the second electrical parameter, and generating a driving bias current according to the comparison result; and according to the driving offset Current adjusting a working drive current of the at least one illuminating light source;

其中所述至少一个发光光源的预定驱动电流与总点亮吋间成正比；其中所述驱动偏置电流对应所述第一及第二电参数的差值。 The predetermined driving current of the at least one illuminating light source is proportional to the total lighting time; wherein the driving bias current corresponds to a difference between the first and second electrical parameters.