WO2013159550A1 - 直下式背光源控制装置及控制方法 - Google Patents
直下式背光源控制装置及控制方法 Download PDFInfo
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- WO2013159550A1 WO2013159550A1 PCT/CN2012/087236 CN2012087236W WO2013159550A1 WO 2013159550 A1 WO2013159550 A1 WO 2013159550A1 CN 2012087236 W CN2012087236 W CN 2012087236W WO 2013159550 A1 WO2013159550 A1 WO 2013159550A1
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- type backlight
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
Definitions
- Embodiments of the present invention relate to the field of liquid crystal display technologies, and in particular, to a backlight control device and a control method thereof. Background technique
- Liquid crystal display is a display that realizes image display by using the principle of liquid crystal power-on and twist. Since liquid crystal molecules do not emit light by themselves, a backlight is usually provided, according to the relative position of the light source and the light guide plate. Differently divided into side-entry backlights and direct-lit backlights.
- red, green, and blue (Red Green Blue, RGB) light-emitting diodes (LEDs) As the light source, red, green, and blue light can be mixed to form a certain color.
- White light and backlight for the LCD For a direct-type backlight with red, green, and blue (Red Green Blue, RGB) light-emitting diodes (LEDs) as the light source, red, green, and blue light can be mixed to form a certain color.
- RGB Red Green Blue, RGB light-emitting diodes
- the direct type backlight can be divided into a plurality of regions, that is, a plurality of light emitting units, and the brightness and color of each area of the direct type backlight are dynamically adjusted according to the content of the display screen on the liquid crystal panel, thereby improving the contrast and color reproduction of the display screen. , to reduce the power consumption of direct backlight.
- the chromaticity of the LED will drift, but the drift of the red, green, and blue LEDs will be different, resulting in the chromaticity of the mixed red, green, and blue LED direct backlights.
- the coordinates appear to drift.
- the driving currents of the red, green, and blue LEDs can be individually adjusted to maintain the original chromaticity of each color of the LED, ensuring the stability of the color of the entire direct backlight.
- the technical problem to be solved by the embodiments of the present invention is to provide a direct-type backlight source control device and a control method thereof, which can realize a direct-lit backlight color in dynamic adjustment of various regions of a direct-lit backlight source. Degree adjustment to reduce the chromaticity drift of the display.
- an embodiment of the present invention provides a direct type backlight control device, including: a sensor connected in sequence, a backlight control circuit, and a direct type backlight driving circuit, wherein the sensor is located in four direct type backlights.
- the direct type backlight driving circuit is connected to the light emitting unit of the direct type backlight, wherein the sensor is configured to detect four light emitting units around the light emitting unit
- the initial driving current or the driving current corresponding to the digital electrical signal value corresponding to the intensity of the currently stored red, green, and blue light is driven, the obtained white light intensity converts the detected white light intensity into the intensity of red, green, and blue light.
- Corresponding signal values are sent to the backlight control circuit;
- the backlight control circuit is configured to receive a signal value corresponding to the intensity of red, green, and blue light sent by the sensor, convert the signal value to a digital electrical signal value corresponding to the intensity of red, green, and blue light, and set an initial driving current
- the digital electrical signal value corresponding to the intensity of red, green, and blue light obtained during driving is stored, and is obtained by driving current corresponding to the digital electric signal value corresponding to the intensity of the currently stored red, green, and blue light.
- the values of the digital electrical signals corresponding to the intensities of the green and blue lights are respectively compared with the values of the digital electrical signals currently stored corresponding to the intensities of red, green and blue light, and the corresponding driving of the light emitting units of the direct type backlights is determined according to the obtained difference values.
- the current is sent to the direct-type backlight driving circuit, and the digital electrical signal value corresponding to the intensity of red, green, and blue light sent by the sensor is stored as the current digital electrical signal value;
- the direct type backlight driving circuit sends a command to make the direct type backlight driving circuit to drive the initial driving Driving four light-emitting units around the sensor for a second predetermined time, and transmitting to the direct-type backlight driving circuit once every first predetermined time interval, driving the current around the sensor with a driving current corresponding to the currently stored digital electrical signal value a command that the lighting unit operates for a second predetermined time;
- the direct type backlight driving circuit is configured to drive the sensor around the sensor according to a command sent by the backlight control circuit to respectively correspond to a driving current corresponding to a digital electrical signal value of a currently stored intensity of red, green, and blue light
- the four light-emitting units operate for a second predetermined time, and adjust the corresponding operating current of the light-emitting unit of the direct-type backlight according to the amplitude of the corresponding driving current of the light-emitting unit of the direct-type backlight sent by the backlight control circuit.
- the senor is located at an upper left corner, a lower left corner, an upper right corner of the direct type backlight or Between adjacent four lighting units in the lower right corner.
- the first predetermined time is 3-30 minutes; the second predetermined time is 1-3 seconds.
- the first predetermined time is 3, 5 or 30 minutes; the second predetermined time is 1 second.
- the backlight control circuit is further configured to convert an amplitude of a corresponding driving current of the light-emitting unit of the direct-lit backlight into a digital signal value recognizable by the direct-type backlight driving circuit.
- the digital signal value recognizable by the direct type backlight driving circuit is a duty ratio of the PWM signal.
- the backlight control circuit is a single chip microcomputer.
- the embodiment of the invention further provides a direct type backlight control method for the above direct type backlight control device, comprising the steps of:
- A a backlight control circuit sends a command to the direct type backlight driving circuit such that the direct type backlight driving circuit drives the four light emitting units around the sensor with an initial driving current for a second predetermined time, and is spaced apart by a first predetermined time direction
- the direct type backlight driving circuit sends a command such that the direct type backlight driving circuit drives four light rays around the sensor with a driving current corresponding to a digital electric signal value corresponding to the intensity of the currently stored red, green, and blue light.
- the unit works for a second predetermined time
- the sensor detects the white light intensity obtained when the four light-emitting units around itself are driven by the initial driving current or the driving current corresponding to the digital electrical signal value corresponding to the intensity of the currently stored red, green, and blue light, which will be detected.
- the white light intensity is converted into a signal value corresponding to the intensity of red, green, and blue light and sent to the backlight control circuit;
- the backlight control circuit receives a signal value corresponding to the intensity of red, green, and blue light sent by the sensor, converts it into a digital electrical signal value corresponding to the intensity of red, green, and blue light, and sets an initial driving current.
- the digital electrical signal value corresponding to the intensity of red, green, and blue light obtained during driving is stored, and is obtained by driving current corresponding to the digital electric signal value corresponding to the intensity of the currently stored red, green, and blue light.
- the values of the digital electrical signals corresponding to the intensities of the green and blue lights are respectively compared with the values of the digital electrical signals currently stored corresponding to the intensities of red, green and blue light, and the corresponding driving of the light emitting units of the direct type backlights is determined according to the obtained difference values.
- the current is sent to the direct-type backlight driving circuit, and the digital electrical signal value corresponding to the intensity of red, green, and blue light sent by the sensor is stored as the current digital electrical signal value;
- the direct type backlight driving circuit is sent according to the direct type of the backlight control circuit
- the corresponding driving current of the light-emitting unit of the backlight needs to be adjusted, and the corresponding operating current of the light-emitting unit of the direct-lit backlight is adjusted.
- the step of determining the magnitude of the corresponding driving current of the light-emitting unit of the direct-lit backlight according to the obtained difference in the step C, and then transmitting the signal to the direct-type backlight driving circuit specifically: the backlight control circuit according to the backlight control circuit
- the obtained difference determines the magnitude of the corresponding driving current of the light-emitting unit of the direct-lit backlight, and the amplitude of the corresponding driving current of the direct-lit backlight needs to be converted into a digital signal that can be recognized by the direct-type backlight driving circuit.
- the value is sent to the direct type backlight driving circuit.
- the digital signal value recognizable by the direct type backlight driving circuit is a duty ratio of the PWM signal.
- the embodiment of the invention discloses a direct-type backlight control device and a control method thereof, which use the above-mentioned direct-type backlight control device to detect and store the light intensity of red, green and blue light of a direct-type backlight by a predetermined time interval, and Comparing with the light intensity of the last stored red, green and blue light, the corresponding driving current of the direct type backlight needs to be adjusted, and the corresponding driving current according to the direct type backlight needs to be adjusted to the direct type backlight.
- the corresponding working current of the source is adjusted, thereby adjusting the chromaticity of the direct type backlight without affecting the dynamic adjustment of the backlight, reducing the chromaticity drift of the display screen, and maintaining the stability of the display screen.
- FIG. 1 is a schematic structural diagram of a direct type backlight control device according to an embodiment of the present invention
- FIG. 2 is a flow chart of a direct type backlight control method according to an embodiment of the present invention.
- 10 direct type backlight
- 20 sensor
- 30 backlight control circuit
- 40 direct type backlight drive circuit
- 101, 102 illumination unit
- 301 input clock line 301
- 302 input data line.
- the direct type backlight control device includes: a sensor 20 connected in sequence, a backlight control circuit 30, and a direct type backlight driving circuit 40, wherein the sensing
- the device 20 is located between any four light-emitting units in the direct-type backlight 10, such as four adjacent light-emitting units shown by a broken line in FIG. 1, and is connected to the backlight control circuit 30, and the direct-type backlight is driven.
- the circuit 40 is connected to the light emitting unit of the direct type backlight 10;
- the direct-type backlight 10 may be an LED array, and includes a plurality of light-emitting units, each of which is composed of red, green, and blue LEDs, and each color LED operates under a respective driving current. Light of a certain brightness, so that red light, green light and blue light in one light-emitting unit are mixed to obtain white light having a certain chromaticity.
- the white light of the two light-emitting units can be obtained after the two light-emitting units are mixed.
- the entire direct-type backlight is a uniform hook light source with a certain color. .
- the sensor 20 is configured to detect, when the four driving units around themselves are driven by an initial driving current or a driving current corresponding to a digital electrical signal value corresponding to the intensity of the currently stored red, green, and blue light, the obtained white light intensity, The detected white light intensity is converted into a signal value corresponding to the intensity of red, green, and blue light and sent to the backlight control circuit 30.
- the sensor 20 may be located in the upper left corner, the lower left corner, the upper right corner or the lower right corner of the direct type backlight 10; Between the light-emitting units, the effect of dynamic adjustment on various areas of the direct-lit backlight is minimized.
- the backlight control circuit 30 is configured to receive a signal value corresponding to the intensity of red, green, and blue light sent by the sensor 20, and convert the signal value to a digital electrical signal value corresponding to the intensity of red, green, and blue light, and the initial The value of the digital electrical signal corresponding to the intensity of the red, green, and blue light obtained when the driving current is driven is stored, and is obtained by driving the driving current corresponding to the digital electrical signal value corresponding to the intensity of the currently stored red, green, and blue light.
- the digital electrical signal values corresponding to the intensities of red, green, and blue light are respectively compared with the currently stored digital electrical signal values corresponding to the intensities of red, green, and blue light, and the light emitting units of the direct type backlight are determined according to the obtained difference values.
- the signal is sent to the direct-type backlight driving circuit 40, and the digital electrical signal value corresponding to the intensity of red, green, and blue light sent by the sensor 20 is used as the current digital electrical signal value.
- the direct-type backlight driving circuit 40 performs a storage; sending a command to the direct-type backlight driving circuit to cause the direct-type backlight driving circuit to have an initial driving current
- the time for example 3-30 minutes, preferably 3, 5 or 30 minutes, is sent to the direct type backlight drive circuit 40 once to drive the four currents around the sensor 20 with a drive current corresponding to the currently stored digital electrical signal value.
- the lighting unit operates for a second predetermined time, for example 1-3 seconds, preferably 1 second.
- the backlight control circuit 30 can be a single chip microcomputer.
- the backlight control circuit 30 is further configured to convert an amplitude of a corresponding driving current of the light-emitting unit of the direct-lit backlight into a digital signal value recognizable by the direct-type backlight driving circuit 40, such as PWM (pulse width modulation, Pulse Width Modulation ) The duty cycle of the signal.
- PWM pulse width modulation, Pulse Width Modulation
- the backlight control circuit 30 further includes an input clock line 301 and an input data line 302.
- the input clock line 301 and the input data line 302 cooperate to receive a digital signal of the backlight dynamic adjustment, and are driven by the direct backlight.
- the interface transmission protocol agreed by the circuit 40 such as SPI (Serial Peripheral Interface) or IIC (Inter IC BUS), outputs the digital signal to the direct type backlight driving circuit 40.
- the illumination unit for driving the direct type backlight performs backlight dynamic adjustment.
- the direct-type backlight driving circuit 40 is configured to drive the driving current corresponding to the digital electrical signal value corresponding to the intensity of the currently stored red, green, and blue light according to the command sent by the backlight control circuit 30.
- the four lighting units around the sensor 20 operate for a second predetermined time, for example 1-3 seconds, preferably 1 second, and the corresponding driving current of the light-emitting unit of the direct-type backlight sent according to the backlight control circuit 30 needs to be adjusted.
- the amplitude adjusts the corresponding operating current of the light-emitting unit of the direct-lit backlight.
- the light intensity of the red, green, and blue light of the direct type backlight is detected and stored by the predetermined time interval, and compared with the light intensity of the red, green, and blue light stored last time.
- the corresponding driving current of the light-emitting unit of the backlight needs to be adjusted, and the corresponding operating current of the light-emitting unit of the direct-type backlight is adjusted according to the corresponding driving current of the light-emitting unit of the direct-type backlight, thereby
- the chromaticity of the direct type backlight is adjusted to reduce the chromaticity shift of the display screen without affecting the dynamic adjustment of the backlight.
- the embodiment of the invention further provides a control method for the above-mentioned direct type backlight control device, which comprises the steps of:
- the backlight control circuit sends a command to the direct type backlight driving circuit such that the direct type backlight driving circuit drives the four light emitting units around the sensor with an initial driving current. And transmitting a command to the direct-type backlight driving circuit at a predetermined time interval, such that the direct-type backlight driving circuit has a digital electrical signal value corresponding to the intensity of the currently stored red, green, and blue light.
- the corresponding driving current drives the four lighting units around the sensor to operate for a second predetermined time;
- the first predetermined time is 3-30 minutes, preferably 3, 5 or 30 minutes;
- the second predetermined time is 1-3 seconds, preferably 1 second;
- the sensor detects the white light intensity obtained when the four light-emitting units around itself are driven by the initial driving current or the driving current corresponding to the digital electrical signal value corresponding to the intensity of the currently stored red, green, and blue light, which will be detected.
- the white light intensity is converted into a signal value corresponding to the intensity of red, green, and blue light and sent to the backlight control circuit;
- the backlight control circuit receives a signal value corresponding to the intensity of red, green, and blue light sent by the sensor, converts it into a digital electrical signal value corresponding to the intensity of red, green, and blue light, and sets an initial driving current.
- the digital electrical signal value corresponding to the intensity of red, green, and blue light obtained during driving is stored, and is obtained by driving current corresponding to the digital electric signal value corresponding to the intensity of the currently stored red, green, and blue light.
- the values of the digital electrical signals corresponding to the intensities of the green and blue lights are respectively compared with the values of the digital electrical signals corresponding to the intensity of the currently stored red, green, and blue light, and the corresponding driving currents of the light emitting units of the direct type backlight are determined according to the obtained difference values.
- the signal is sent to the direct-type backlight driving circuit, and the digital electrical signal value corresponding to the intensity of red, green, and blue light sent by the sensor is stored as a current digital electrical signal value;
- the method further includes: determining, by the backlight control circuit, the direct difference according to the obtained difference After the corresponding driving current of the light-emitting unit of the backlight needs to be adjusted, the amplitude of the corresponding driving current of the direct-type backlight needs to be converted into a digital signal value recognizable by the direct-type backlight driving circuit, and sent to the Direct type backlight driving circuit;
- the digital signal value recognizable by the direct type backlight driving circuit is a duty ratio of the PWM signal.
- the direct-type backlight driving circuit adjusts the corresponding operating current of the light-emitting unit of the direct-lit backlight according to the amplitude of the corresponding driving current of the light-emitting unit of the direct-type backlight sent by the backlight control circuit.
- the backlight control circuit sends a command to drive the direct-type backlight driving circuit to drive all the LEDs of the four light-emitting units in the lower right corner of the backlight to operate under the initial driving current for one second, and the sensor obtains red and green.
- the intensity of the blue light corresponds to the signal value and is stored by the backlight control circuit to generate a corresponding PWM signal duty cycle, and then within three hours, every three minutes, driving the lower right corner of the four light-emitting units in the currently stored PWM
- the driving current corresponding to the duty ratio of the signal is operated for 1 second, and the signal value corresponding to the intensity of red, green, and blue light is obtained by the sensor, and the duty ratio of the corresponding PWM signal is generated by the backlight control circuit, respectively, and current Comparing the duty ratios of the stored PWM signals, determining the magnitude of the corresponding driving current of the light-emitting unit of the direct-lit backlight according to the obtained difference, and transmitting the amplitude to the direct-type backlight driving circuit to the direct-type backlight
- the driving current of the light emitting unit is adjusted, and the duty ratio of the generated PWM signal is stored as the duty ratio of the current PWM signal; After half an hour, every five minutes, the four light-emitting units in the lower
- the signal value is compared with the duty ratio of the currently stored PWM signal by the backlight control circuit to generate the duty ratio of the corresponding PWM signal, and the corresponding driving of the light emitting unit of the direct type backlight is determined according to the obtained difference value.
- the direct-type backlight driving circuit is sent to adjust the driving current of the light-emitting unit of the direct-type backlight, and the duty ratio of the generated PWM signal is used as the duty ratio of the current PWM signal.
- Storage After one hour of operation, every 30 minutes, the four illumination units in the lower right corner are driven to operate for 1 second under the driving current corresponding to the duty ratio of the currently stored PWM signal, and the intensity of red, green and blue light is obtained by the sensor.
- Corresponding signal values are generated by the backlight control circuit to generate a duty ratio of the corresponding PWM signal, respectively, and a duty ratio of the currently stored PWM signal And determining, according to the obtained difference, an amplitude of the corresponding driving current of the light-emitting unit of the direct-type backlight, and then transmitting the driving current to the direct-type backlight driving circuit to adjust the driving current of the light-emitting unit of the direct-type backlight, and The duty ratio of the generated PWM signal is stored as the duty ratio of the current PWM signal.
- the chromaticity of the direct-type backlight is adjusted to reduce the chromaticity drift of the display screen without affecting the dynamic adjustment of the backlight.
- the selection of the first predetermined time may be arbitrarily set according to actual conditions, for example, may be 3, 5 or 30 minutes, or different intervals may be applied at different stages similar to the above setting.
- the embodiment of the present invention discloses a direct type backlight control device and a control method thereof, which are detected and stored under a predetermined interval by using the above-described direct type backlight control device.
- the light intensity of the red, green and blue light of the backlight is compared with the light intensity of the red, green and blue light stored last time, and the corresponding driving current of the direct type backlight needs to be adjusted, and then according to the direct type
- the corresponding driving current of the backlight needs to be adjusted to adjust the corresponding working current of the direct type backlight, thereby realizing the adjustment of the chromaticity of the direct type backlight without affecting the dynamic adjustment of the backlight, and reducing the display screen.
- the chromaticity drift maintains the stability of the display.
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Abstract
一种直下式背光源控制装置及控制方法，所述直下式背光源控制装置包括：依次连接的传感器（20）、背光控制电路（30）和直下式背光源驱动电路（40），所述传感器（20）位于直下式背光源（10）的四个发光单元（101，102）之间，并与所述背光控制电路（30）连接，所述直下式背光源驱动电路（40）与直下式背光源（10）的发光单元（101，102）相连接。通过间隔预定时间检测并存储红、绿、蓝光的光强度，并与上一次存储的红、绿、蓝光的光强度进行比较得出相应驱动电流需要调整的幅度，再根据所述相应驱动电流需要调整的幅度对直下式背光源（10）的相应工作电流进行调整，对直下式背光源（10）的色度进行调节。本发明提供的控制装置及控制方法能够减少显示画面的色度漂移，维护了显示画面的移定性。
Description
直下式背光源控制装置及控制方法 技术领域
本发明实施例涉及液晶显示技术领域， 尤其涉及一种背光源控制装置及 控制方法。 背景技术
液晶显示器 (Liquid Crystal Display,简称 LCD)是一种利用液晶加电扭转 原理实现图像显示的显示器， 由于液晶分子本身并不发光， 因此， 通常要设 置背光源，根据光源与导光板的相对位置的不同分为侧入式背光源和直下式 背光源。
对于以红、绿、蓝（Red Green Blue,简称 RGB )三基色发光二极管 (Light Emitting Diode, 简称 LED)为光源的直下式背光源， 可以将红、 绿、 蓝光进 行均勾混合形成具有一定色度的白光， 并为 LCD提供背光。
可以将直下式背光源分成多个区域， 即多个发光单元， 根据液晶面板上 显示画面的内容， 动态调整直下式背光源各个区域的亮度和色彩， 从而达到 提高显示画面的对比度和色彩还原性， 降低直下式背光源功耗的目的。
随着工作时间的增长和工作温度的增加， LED的色度会出现漂移，但是 红、 绿、 蓝 LED的漂移量不同， 从而导致经混合的红、 绿、 蓝 LED直下式 背光源的色度坐标出现漂移。 这时可以对红、 绿、 蓝 LED 的驱动电流分别 进行调整， 使每种颜色的 LED维持原来的色度， 保证整个直下式背光源色 度的稳定性。
直下式背光源各个区域的动态调整和直下式背光源色度的调整无法同 时进行， 其原因在于， 直下式背光源的各个区域的动态调整是要根据显示画 面的内容， 实时对直下式背光源各个区域的亮度和色彩进行调整的， 而直下 式背光源色度的调整， 需要用传感器检测红、 绿、 蓝 LED在驱动电流驱动 时所混合后的光。 在存在动态调整的直下式背光源中， 无法判断传感器检测 到的信息是直下式背光源的动态调整， 还是因 LED自身衰减导致。 发明内容
(一）要解决的技术问题
本发明实施例要解决的技术问题是， 针对上述缺陷， 如何提供一种直下 式背光源控制装置及控制方法， 其能够在直下式背光源各个区域的动态调整 中， 实现对直下式背光源色度的调整， 减少显示画面的色度漂移。
(二）技术方案
为解决上述技术问题， 本发明实施例提供了一种直下式背光源控制装 置， 包括： 依次连接的传感器、 背光控制电路和直下式背光源驱动电路， 所 述传感器位于直下式背光源的四个发光单元之间， 并与所述背光控制电路连 接， 所述直下式背光源驱动电路与直下式背光源的发光单元相连接， 其中， 所述传感器， 用于检测自身周围的四个发光单元在初始驱动电流或与对 应于当前存储的红、绿、蓝光的强度的数字电信号值对应的驱动电流驱动时， 得到的白光强度， 将检测到的白光强度转换为与红、 绿、 蓝光的强度对应的 信号值并发送到背光控制电路；
所述背光控制电路， 用于接收所述传感器发送的与红、 绿、 蓝光的强度 对应的信号值， 将其转换为与红、 绿、 蓝光的强度对应的数字电信号值， 将 初始驱动电流驱动时得到的与红、 绿、 蓝光的强度对应的数字电信号值进行 存储， 将与对应于当前存储的红、 绿、 蓝光的强度的数字电信号值对应的驱 动电流驱动时得到的与红、 绿、 蓝光的强度对应的数字电信号值分别与当前 存储的与红、 绿、 蓝光的强度对应的数字电信号值进行比较， 根据所得的差 值确定直下式背光源的发光单元的对应驱动电流需要调整的幅度后，发送给 所述直下式背光源驱动电路， 并将所述传感器发送的与红、 绿、 蓝光的强度 对应的数字电信号值作为当前数字电信号值进行存储； 向所述直下式背光源 驱动电路发送命令使得所述直下式背光源驱动电路以初始驱动电流驱动传 感器周围的四个发光单元工作第二预定时间， 并间隔第一预定时间向所述直 下式背光源驱动电路发送一次以当前存储的数字电信号值对应的驱动电流 驱动所述传感器周围的四个发光单元工作第二预定时间的命令；
所述直下式背光源驱动电路， 用于根据所述背光控制电路发送来的命令 以与对应于当前存储的红、 绿、 蓝光的强度的数字电信号值对应的驱动电流 分别驱动所述传感器周围的四个发光单元工作第二预定时间， 并根据所述背 光控制电路发送的直下式背光源的发光单元的对应驱动电流需要调整的幅 度， 对直下式背光源的发光单元的对应工作电流进行调整。
其中， 所述传感器位于所述直下式背光源的左上角、 左下角、 右上角或
右下角的相邻的四个发光单元之间。
其中， 所述第一预定时间为 3-30分钟； 所述第二预定时间为 1-3秒。 其中，所述第一预定时间为 3、 5或 30分钟； 所述第二预定时间为 1秒。 其中， 所述背光控制电路还用于将直下式背光源的发光单元的对应驱动 电流需要调整的幅度转换成所述直下式背光源驱动电路能够识别的数字信 号值。
其中， 所述直下式背光源驱动电路能够识别的数字信号值为 PWM信号 的占空比。
其中， 所述背光控制电路为单片机。
本发明实施例还提供了一种上述直下式背光源控制装置的直下式背光 源控制方法， 包括步骤：
A: 背光控制电路向所述直下式背光源驱动电路发送命令使得所述直下 式背光源驱动电路以初始驱动电流驱动传感器周围的四个发光单元工作第 二预定时间， 并间隔第一预定时间向所述直下式背光源驱动电路发送一次命 令使得所述直下式背光源驱动电路以与对应于当前存储的红、 绿、 蓝光的强 度的数字电信号值对应的驱动电流驱动传感器周围的四个发光单元工作第 二预定时间；
B: 所述传感器检测自身周围四个发光单元在初始驱动电流或与对应于 当前存储的红、 绿、 蓝光的强度的数字电信号值对应的驱动电流驱动时得到 的白光强度， 将检测到的白光强度转换为与红、 绿、 蓝光的强度对应的信号 值并发送到所述背光控制电路；
C: 所述背光控制电路接收所述传感器发送来的与红、 绿、 蓝光的强度 对应的信号值， 将其转换为与红、 绿、 蓝光的强度对应的数字电信号值， 将 初始驱动电流驱动时得到的与红、 绿、 蓝光的强度对应的数字电信号值进行 存储， 将与对应于当前存储的红、 绿、 蓝光的强度的数字电信号值对应的驱 动电流驱动时得到的与红、 绿、 蓝光的强度对应的数字电信号值分别与当前 存储的与红、 绿、 蓝光的强度对应的数字电信号值进行比较， 根据所得的差 值确定直下式背光源的发光单元的对应驱动电流需要调整的幅度后，发送给 所述直下式背光源驱动电路， 并将所述传感器发送的与红、 绿、 蓝光的强度 对应的数字电信号值作为当前数字电信号值进行存储；
D: 所述直下式背光源驱动电路根据所述背光控制电路发送来的直下式
背光源的发光单元的对应驱动电流需要调整的幅度，对直下式背光源的发光 单元的对应工作电流进行调整。
其中，所述步骤 C中的根据所得的差值确定直下式背光源的发光单元的 对应驱动电流需要调整的幅度后，发送给所述直下式背光源驱动电路具体包 括： 所述背光控制电路根据所得的差值确定直下式背光源的发光单元的对应 驱动电流需要调整的幅度后，将直下式背光源的相应驱动电流需要调整的幅 度转换成所述直下式背光源驱动电路能够识别的数字信号值，发送给所述直 下式背光源驱动电路。
其中， 所述直下式背光源驱动电路能够识别的数字信号值为 PWM信号 的占空比。
(三）有益效果
本发明实施例公开了一种直下式背光源控制装置及控制方法， 利用上述 的直下式背光源控制装置， 通过间隔预定时间检测并存储直下式背光源的 红、 绿、 蓝光的光强度， 并与上一次存储的红、 绿、 蓝光的光强度进行比较 得出直下式背光源的相应驱动电流需要调整的幅度，再根据所述直下式背光 源的相应驱动电流需要调整的幅度对直下式背光源的相应工作电流进行调 整， 从而在不影响背光动态调节的情况下， 实现了对直下式背光源的色度进 行调节， 减少显示画面的色度漂移， 维持了显示画面的稳定性。 附图说明
图 1是本发明实施例所述的直下式背光源控制装置的结构示意图； 图 2是本发明实施例所述的直下式背光源控制方法的流程图。
其中， 10: 直下式背光源； 20: 传感器； 30: 背光控制电路； 40: 直下 式背光源驱动电路； 101、 102: 发光单元； 301 : 输入时钟线 301 ; 302: 输 入数据线。 具体实施方式
下面结合附图和实施例， 对本发明的具体实施方式作进一步详细说明。 以下实施例用于说明本发明， 但不用来限制本发明的范围。
如图 1所示， 本发明实施例所述的直下式背光源控制装置， 包括： 依次 连接的传感器 20、 背光控制电路 30和直下式背光源驱动电路 40 , 所述传感
器 20位于直下式背光源 10中任意四个发光单元之间， 例如图 1中虚线框所 示的四个相邻发光单元， 并与所述背光控制电路 30连接， 所述直下式背光 源驱动电路 40与直下式背光源 10的发光单元相连接；
所述直下式背光源 10可以为 LED阵列， 包括多个发光单元， 每个发光 单元由红、 绿、 蓝三种颜色的 LED组成 , 每一种颜色的 LED在各自的驱动 电流下工作， 发出一定亮度的光， 从而使得一个发光单元中的红光、 绿光和 蓝光在经过混光后， 得到具有一定色度的白光。 对于各个发光单元之间的距 离和排列形式， 例如发光单元 101 中红、 绿、 蓝 LED的正三角排列形式和 发光单元 102中红、 绿、 蓝 LED的倒三角排列形式， 如果两个发光单元中 三组同色光 LED的距离相等， 则可以在两个发光单元混光后获得均勾的白 色光， 同理， 依此类推， 使得整个直下式背光源为具有一定色度的均勾面光 源。
所述传感器 20,用于检测自身周围的四个发光单元在初始驱动电流或与 对应于当前存储的红、 绿、 蓝光的强度的数字电信号值对应的驱动电流驱动 时， 得到的白光强度， 将检测到的白光强度转换为与红、 绿、 蓝光的强度对 应的信号值并发送到背光控制电路 30。
由于进行上述检测会对直下式背光源各个区域的动态调整造成影响， 因 此所述传感器 20可以位于所述直下式背光源 10的左上角、 左下角、 右上角 或右下角的相邻的四个发光单元之间，尽量减小对直下式背光源各个区域的 动态调整的影响。
所述背光控制电路 30, 用于接收所述传感器 20发送的与红、 绿、 蓝光 的强度对应的信号值， 将其转换为与红、 绿、 蓝光的强度对应的数字电信号 值， 将初始驱动电流驱动时得到的与红、 绿、 蓝光的强度对应的数字电信号 值进行存储， 将与对应于当前存储的红、 绿、 蓝光的强度的数字电信号值对 应的驱动电流驱动时得到的与红、 绿、 蓝光的强度对应的数字电信号值分别 与当前存储的与红、 绿、 蓝光的强度对应的数字电信号值进行比较， 根据所 得的差值确定直下式背光源的发光单元的对应驱动电流需要调整的幅度后， 发送给所述直下式背光源驱动电路 40, 并将所述传感器 20发送的与红、绿、 蓝光的强度对应的数字电信号值作为当前的数字电信号值进行存储； 向所述 直下式背光源驱动电路发送命令使得所述直下式背光源驱动电路以初始驱 动电流驱动传感器周围的四个发光单元工作第二预定时间， 并间隔第一预定
时间， 例如 3-30分钟， 优选为 3、 5或 30分钟向所述直下式背光源驱动电 路 40发送一次以与当前存储的数字电信号值对应的驱动电流驱动所述传感 器 20周围的四个发光单元工作第二预定时间， 例如 1-3秒， 优选为 1秒的 命令。
所述背光控制电路 30可以为单片机。
所述背光控制电路 30还用于将直下式背光源的发光单元的对应驱动电 流需要调整的幅度转换成所述直下式背光源驱动电路 40能够识别的数字信 号值， 例如 PWM (脉冲宽度调制， Pulse Width Modulation )信号的占空比。
所述背光控制电路 30还包括输入时钟线 301和输入数据线 302,所述输 入时钟线 301和输入数据线 302配合用于接收背光动态调节的数字信号， 并 以与所述直下式背光源驱动电路 40约定的接口传输协议， 例如 SPI (串行外 设接口， Serial Peripheral Interface )或 IIC ( IC之间总线， Inter IC BUS ), 将 该数字信号输出给所述直下式背光源驱动电路 40以用于驱动直下式背光源 的发光单元进行背光动态调节。
所述直下式背光源驱动电路 40, 用于根据所述背光控制电路 30发送来 的命令， 以与对应于当前存储的红、 绿、 蓝光的强度的数字电信号值对应的 驱动电流分别驱动所述传感器 20周围的四个发光单元工作第二预定时间， 例如 1-3秒， 优选为 1秒， 并根据所述背光控制电路 30发送的直下式背光 源的发光单元的对应驱动电流需要调整的幅度，对直下式背光源的发光单元 的对应工作电流进行调整。
利用上述的直下式背光源控制装置，通过间隔预定时间检测并存储直下 式背光源的红、 绿、 蓝光的光强度， 并与上一次存储的红、 绿、 蓝光的光强 度进行比较得出直下式背光源的发光单元的相应驱动电流需要调整的幅度， 再根据所述直下式背光源的发光单元的相应驱动电流需要调整的幅度对直 下式背光源的发光单元的对应工作电流进行调整，从而在不影响背光动态调 节的情况下， 实现了对直下式背光源的色度进行调节， 减少显示画面的色度 漂移。
本发明实施例还提供了一种上述直下式背光源控制装置的控制方法， 包 括步骤：
A: 背光控制电路向所述直下式背光源驱动电路发送命令使得所述直下 式背光源驱动电路以初始驱动电流驱动传感器周围的四个发光单元工作第
二预定时间， 并间隔第一预定时间向所述直下式背光源驱动电路发送一次命 令使得所述直下式背光源驱动电路以与对应于当前存储的红、 绿、 蓝光的强 度的数字电信号值对应的驱动电流驱动传感器周围的四个发光单元工作第 二预定时间；
所述第一预定时间为 3-30分钟， 优选为 3、 5或 30分钟；
所述第二预定时间为 1-3秒， 优选为 1秒；
B: 所述传感器检测自身周围四个发光单元在初始驱动电流或与对应于 当前存储的红、 绿、 蓝光的强度的数字电信号值对应的驱动电流驱动时得到 的白光强度， 将检测到的白光强度转换为与红、 绿、 蓝光的强度对应的信号 值并发送到所述背光控制电路；
C: 所述背光控制电路接收所述传感器发送来的与红、 绿、 蓝光的强度 对应的信号值， 将其转换为与红、 绿、 蓝光的强度对应的数字电信号值， 将 初始驱动电流驱动时得到的与红、 绿、 蓝光的强度对应的数字电信号值进行 存储， 将与对应于当前存储的红、 绿、 蓝光的强度的数字电信号值对应的驱 动电流驱动时得到的与红、 绿、 蓝光的强度对应的数字电信号值分别与当前 存储的红、 绿、 蓝光的强度对应的数字电信号值进行比较， 根据所得的差值 确定直下式背光源的发光单元的对应驱动电流需要调整的幅度后，发送给所 述直下式背光源驱动电路， 并将所述传感器发送的与红、 绿、 蓝光的强度对 应的数字电信号值作为当前的数字电信号值进行存储；
所述根据所得的差值确定直下式背光源的发光单元的对应驱动电流需 要调整的幅度后， 发送给所述直下式背光源驱动电路具体包括： 所述背光控 制电路根据所得的差值确定直下式背光源的发光单元的对应驱动电流需要 调整的幅度后，将直下式背光源的相应驱动电流需要调整的幅度转换成所述 直下式背光源驱动电路能够识别的数字信号值，发送给所述直下式背光源驱 动电路；
所述直下式背光源驱动电路能够识别的数字信号值为 PWM信号的占空 比。
D: 所述直下式背光源驱动电路根据所述背光控制电路发送来的直下式 背光源的发光单元的对应驱动电流需要调整的幅度，对直下式背光源的发光 单元的对应工作电流进行调整。
上述直下式背光源控制方法的一个实施例如下：
首先， 所述背光控制电路向所述直下式背光源驱动电路发送命令驱动直 下式背光源右下角四个发光单元的所有 LED都在初始驱动电流下工作 1秒 钟， 由传感器得到与红、 绿、 蓝光的强度对应的信号值并由所述背光控制电 路生成相应的 PWM信号的占空比进行存储，然后在半小时内，每隔 3分钟， 驱动右下角四个发光单元在当前存储的 PWM信号的占空比对应的驱动电流 下工作 1秒钟， 由传感器得到与红、 绿、 蓝光的强度对应的信号值并由所述 背光控制电路生成相应的 PWM信号的占空比后分别与当前存储的 PWM信 号的占空比进行比较，根据所得的差值确定直下式背光源的发光单元的对应 驱动电流需要调整的幅度后，发送给所述直下式背光源驱动电路对直下式背 光源的发光单元的驱动电流进行调整， 并将生成的 PWM信号的占空比作为 当前 PWM信号的占空比进行存储； 工作半小时后， 每隔 5分钟， 驱动右下 角四个发光单元在与当前存储的 PWM信号的占空比对应的驱动电流下工作 1秒钟， 由传感器得到与红、 绿、 蓝光的强度对应的信号值并由所述背光控 制电路生成相应的 PWM信号的占空比后分别与当前存储的 PWM信号的占 空比进行比较，根据所得的差值确定直下式背光源的发光单元的对应驱动电 流需要调整的幅度后，发送给所述直下式背光源驱动电路对直下式背光源的 发光单元的驱动电流进行调整， 并将生成的 PWM信号的占空比作为当前 PWM信号的占空比进行存储； 工作一个小时后， 每隔 30分钟， 驱动右下角 四个发光单元在当前存储的 PWM信号的占空比对应的驱动电流下工作 1秒 钟， 由传感器得到与红、 绿、 蓝光的强度对应的信号值并由所述背光控制电 路生成相应的 PWM信号的占空比后分别与当前存储的 PWM信号的占空比 进行比较，根据所得的差值确定直下式背光源的发光单元的对应驱动电流需 要调整的幅度后，发送给所述直下式背光源驱动电路对直下式背光源的发光 单元的驱动电流进行调整， 并将生成的 PWM信号的占空比作为当前 PWM 信号的占空比进行存储。
如此不断进行下去， 在不影响背光动态调节的情况下， 实现了对直下式 背光源的色度进行调节， 减少显示画面的色度漂移。
上述第一预定时间的选择可以根据实际情况任意设置，例如可以均为 3、 5或 30分钟， 也可以类似于上述设置的在不同阶段应用不同间隔时间。
综上所述， 本发明实施例公开了一种直下式背光源控制装置及控制方 法， 利用上述的直下式背光源控制装置， 通过间隔预定时间检测并存储直下
式背光源的红、 绿、 蓝光的光强度， 并与上一次存储的红、 绿、 蓝光的光强 度进行比较得出直下式背光源的相应驱动电流需要调整的幅度，再根据所述 直下式背光源的相应驱动电流需要调整的幅度对直下式背光源的相应工作 电流进行调整， 从而在不影响背光动态调节的情况下， 实现了对直下式背光 源的色度进行调节， 减少显示画面的色度漂移， 维持了显示画面的稳定性。
以上实施方式仅用于说明本发明， 而并非对本发明的限制， 有关技术领 域的普通技术人员， 在不脱离本发明的精神和范围的情况下， 还可以做出各 种变化和变型， 因此所有等同的技术方案也属于本发明的范畴， 本发明的专 利保护范围应由权利要求限定。
Claims
1、 一种直下式背光源控制装置， 包括： 依次连接的传感器、 背光控制 电路和直下式背光源驱动电路， 所述传感器位于直下式背光源的四个发光单 元之间， 并与所述背光控制电路连接， 所述直下式背光源驱动电路与直下式 背光源的发光单元相连接， 其中，
所述传感器， 用于检测自身周围的四个发光单元在初始驱动电流或与对 应于当前存储的红、绿、蓝光的强度的数字电信号值对应的驱动电流驱动时， 得到的白光强度， 将检测到的白光强度转换为与红、 绿、 蓝光的强度对应的 信号值并发送到背光控制电路；
所述背光控制电路， 用于接收所述传感器发送的与红、 绿、 蓝光的强度 对应的信号值， 将其转换为与红、 绿、 蓝光的强度对应的数字电信号值， 将 初始驱动电流驱动时得到的与红、 绿、 蓝光的强度对应的数字电信号值进行 存储， 将与对应于当前存储的红、 绿、 蓝光的强度的数字电信号值对应的驱 动电流驱动时得到的与红、 绿、 蓝光的强度对应的数字电信号值分别与当前 存储的与红、 绿、 蓝光的强度对应的数字电信号值进行比较， 根据所得的差 值确定直下式背光源的发光单元的对应驱动电流需要调整的幅度后，发送给 所述直下式背光源驱动电路， 并将所述传感器发送的与红、 绿、 蓝光的强度 对应的数字电信号值作为当前数字电信号值进行存储； 向所述直下式背光源 驱动电路发送命令使得所述直下式背光源驱动电路以初始驱动电流驱动传 感器周围的四个发光单元工作第二预定时间， 并间隔第一预定时间向所述直 下式背光源驱动电路发送一次以当前存储的数字电信号值对应的驱动电流 驱动所述传感器周围的四个发光单元工作第二预定时间的命令；
所述直下式背光源驱动电路， 用于根据所述背光控制电路发送来的命令 以与对应于当前存储的红、 绿、 蓝光的强度的数字电信号值对应的驱动电流 分别驱动所述传感器周围的四个发光单元工作第二预定时间， 并根据所述背 光控制电路发送的直下式背光源的发光单元的对应驱动电流需要调整的幅 度， 对直下式背光源的发光单元的对应工作电流进行调整。
2、 根据权利要求 1 所述的直下式背光源控制装置， 其中， 所述传感器 位于所述直下式背光源的左上角、 左下角、 右上角或右下角的相邻的四个发 光单元之间。
3、 根据权利要求 1 所述的直下式背光源控制装置， 其中， 所述第一预 定时间为 3-30分钟； 所述第二预定时间为 1-3秒。
4、 根据权利要求 3所述的直下式背光源控制装置， 其中， 所述第一预 定时间为 3、 5或 30分钟； 所述第二预定时间为 1秒。
5、 根据权利要求 1 所述的直下式背光源控制装置， 其中， 所述背光控 制电路还用于将直下式背光源的发光单元的对应驱动电流需要调整的幅度 转换成所述直下式背光源驱动电路能够识别的数字信号值。
6、 根据权利要求 5所述的直下式背光源控制装置， 其中， 所述直下式 背光源驱动电路能够识别的数字信号值为 PWM信号的占空比。
7、 根据权利要求 1-6 中任一项所述的直下式背光源控制装置， 其中， 所述背光控制电路为单片机。
8、 一种根据权利要求 1-7 中任一项所述直下式背光源控制装置的直下 式背光源控制方法， 包括步骤：
A: 背光控制电路向所述直下式背光源驱动电路发送命令使得所述直下 式背光源驱动电路以初始驱动电流驱动传感器周围的四个发光单元工作第 二预定时间， 并间隔第一预定时间向所述直下式背光源驱动电路发送一次命 令使得所述直下式背光源驱动电路以与对应于当前存储的红、 绿、 蓝光的强 度的数字电信号值对应的驱动电流驱动传感器周围的四个发光单元工作第 二预定时间；
B: 所述传感器检测自身周围四个发光单元在初始驱动电流或与对应于 当前存储的红、 绿、 蓝光的强度的数字电信号值对应的驱动电流驱动时得到 的白光强度， 将检测到的白光强度转换为与红、 绿、 蓝光的强度对应的信号 值并发送到所述背光控制电路；
C: 所述背光控制电路接收所述传感器发送来的与红、 绿、 蓝光的强度 对应的信号值， 将其转换为与红、 绿、 蓝光的强度对应的数字电信号值， 将 初始驱动电流驱动时得到的与红、 绿、 蓝光的强度对应的数字电信号值进行 存储， 将与对应于当前存储的红、 绿、 蓝光的强度的数字电信号值对应的驱 动电流驱动时得到的与红、 绿、 蓝光的强度对应的数字电信号值分别与当前 存储的与红、 绿、 蓝光的强度对应的数字电信号值进行比较， 根据所得的差 值确定直下式背光源的发光单元的对应驱动电流需要调整的幅度后，发送给 所述直下式背光源驱动电路， 并将所述传感器发送的红、 绿、 蓝光的强度对 应的数字电信号值作为当前数字电信号值进行存储；
D: 所述直下式背光源驱动电路根据所述背光控制电路发送来的直下式 背光源的发光单元的对应驱动电流需要调整的幅度，对直下式背光源的发光 单元的对应工作电流进行调整。
9、 根据权利要求 8所述的直下式背光源控制方法， 其中， 所述步骤 C 中的根据所得的差值确定直下式背光源的发光单元的对应驱动电流需要调 整的幅度后， 发送给所述直下式背光源驱动电路具体包括： 所述背光控制电 路根据所得的差值确定直下式背光源的发光单元的对应驱动电流需要调整 的幅度后，将直下式背光源的相应驱动电流需要调整的幅度转换成所述直下 式背光源驱动电路能够识别的数字信号值，发送给所述直下式背光源驱动电 路。
10、 根据权利要求 9所述的直下式背光源控制方法， 其中， 所述直下式 背光源驱动电路能够识别的数字信号值为 PWM信号的占空比。
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