WO2013170460A1 - Led display screen constant current drive control system and output current control method therefor - Google Patents

Led display screen constant current drive control system and output current control method therefor Download PDF

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Publication number
WO2013170460A1
WO2013170460A1 PCT/CN2012/075616 CN2012075616W WO2013170460A1 WO 2013170460 A1 WO2013170460 A1 WO 2013170460A1 CN 2012075616 W CN2012075616 W CN 2012075616W WO 2013170460 A1 WO2013170460 A1 WO 2013170460A1
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Prior art keywords
constant current
led
output
pins
terminal
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PCT/CN2012/075616
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French (fr)
Chinese (zh)
Inventor
胡家同
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深圳市摩西尔电子有限公司
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Priority to PCT/CN2012/075616 priority Critical patent/WO2013170460A1/en
Publication of WO2013170460A1 publication Critical patent/WO2013170460A1/en

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery

Definitions

  • the invention relates to an LED driving control technology, in particular to a constant current LED display driving control system with a quick setting function and a control data setting method thereof.
  • the display is one of the important media for people to receive a variety of information.
  • the display has an important indicator, that is, the display's quick response capability.
  • the current control signals of the traditional LED constant current driving chip are serially transmitted by the shift register module. Since the shift register module uses words as the processing unit, the longer the word length, the longer the processing time; usually the current control signal.
  • the number of bits is less than the word length, so that the data transmitted less than the word length also needs to pass the transmission time of the entire word, which limits the transmission speed of the data information smaller than the word length, especially when multiple LED constant current driving chips are cascaded.
  • the delay is more obvious. The more the cascading, the more serious the delay, the lower the data transmission efficiency, the faster the response capability of the LED display control system, and the system function is not easy to expand.
  • a LED display constant current driving control system comprising N cascaded LED constant current driving chips, a clock CLK end, a data latch LE end, an output enable OE end, wherein the first LED
  • the data output DO pin of the constant current driving chip is connected to the data input DI pin of the second LED constant current driving chip, and the data output DO pin of the second LED constant current driving chip and the data input of the third LED constant current driving chip
  • the DI pins are connected to be connected to the Nth LED driving chip;
  • the clock CLK pins of the N LED constant current driving chips are connected to each other and connected to the clock CLK terminal;
  • the data latches LE pins of the chip are connected to each other and connected to the data latch LE end;
  • the output enable OE pins of the N LED constant current driving chips are connected to each other, and are connected to the output enable OE
  • the M output pins OUT1 -OUTM of the N LED constant current driving chips are connected to their respective controlled LED arrays; the power supply VDD
  • control state data of the output OUT1 - OUTM pins of the respective N LED constant current drive chips are input from the data input DI of the first LED constant current drive chip.
  • the current control signal includes clock and current control data.
  • the invention also provides an output current control method for a constant current drive control system of an LED display screen, wherein the LED display constant current drive control system comprises N cascaded LED constant current driving chips, a clock CLK terminal, and a data latch The LE end and the output enable OE end, wherein the data output DO pin of the first LED constant current driving chip is connected to the data input DI pin of the second LED constant current driving chip, and the data output DO of the second LED constant current driving chip The pin is connected to the data input DI pin of the third LED constant current driving chip, so as to be cascaded to the Nth LED driving chip; the clock CLK pins of the N LED constant current driving chips are connected to each other, and connected to the a clock CLK terminal; the data latch LE pins of the N LED constant current driving chips are connected to each other, and are connected to the data latch LE end; the output of the N LED constant current driving chips is enabled OE The legs are connected to each other and connected to the output enable OE terminal; the M output pins OUT1 - OUTM of the N
  • the resistor is connected to the power ground; when the current control signal is input, the current control signal is input by using any one or more of the three terminals of the output enable OE terminal, the data latch LE terminal, and the clock CLK terminal, and the N LEDs are controlled. Constant current drive chip output OUT1 - OUTM pin output current.
  • the current control signal includes clock and current control data
  • the LED display constant current drive control system operates in a non-current adjustment state and a current adjustment state; in the non-current adjustment state, if in the clock
  • the current control data is written into the LED display.
  • Each LED constant current driving chip in the flow driving control system; after completion, the LED display constant current driving control system exits the current adjustment state; the LED constant current driving control system of each LED constant current driving chip is based on The current control data realizes adjustment of an output current of N driving outputs OUT1 - OUTM pins of each LED constant current driving chip in the LED display constant current driving control system.
  • the method may also be: the current control signal includes a clock and a level; and the LED display constant current drive control system includes two states of operation: a non-current adjustment state and a current adjustment state;
  • the LED constant current driving chips in the LED display constant current drive control system pass The clock counts the level width; after completion, the LED constant current driving chip in the LED display constant current driving control system exits the current adjustment state; the LED display constant current driving control system LED constant current driving The chip realizes adjustment of the output current of the N driving outputs OUT1 - OUTM pins of the LED constant current driving chips in the LED display constant current driving control system according to the count value.
  • control data of the output current is not obtained after serial serialization by the chip, it is not limited by the word length of the control word, so that the current control speed is increased, and the more the driver chip cascades, the effect is obtained. More obvious, this improves the utilization of the hardware, makes the system's functions easy to expand, and the response performance of the LED control system is improved.
  • FIG. 1 is a schematic diagram of a constant current drive control system of an LED display screen (the chip output is taken as an example of 16 bits);
  • FIG. 2 is a timing diagram of control data data in the prior art for transmitting OUT0_OUT15 (chip output is 16 bits as an example);
  • FIG. 3 is a timing diagram of a transmission current control signal in the prior art
  • Figure 5 is a timing chart of the output current control method of the second embodiment of the present invention.
  • FIG. 1 is a schematic diagram of the LED drive control system (the chip output is 16 bits as an example).
  • N LED constant current drive chips are cascaded, and the data output of the first LED constant current drive chip is cited.
  • the pin DO is connected to the data input pin DI of the second LED constant current driving chip, and the data output pin DO of the second LED constant current driving chip is connected to the data input pin DI of the third LED constant current driving chip, so that the cascading To the Nth LED driver chip;
  • the clocks of the N LED constant current driver chips are connected to each other and connected to the clock CLK terminal;
  • the data latches of the N LED constant current driver chips are connected to each other, and connected To the data latch LE end;
  • N LED constant current driving chip power pin VDD is connected to the power supply;
  • the output enable OE terminal, the data latch LE terminal, and the clock CLK terminal are used as the current control signal input. Terminal for inputting electricity
  • the control signal controls the output current of the output pins OUT1_OUTM of the N LED constant current driving chips; since the current control signal is no longer serially input from the data input terminal DI, the clock CLK terminal and the data latch LE end are directly used.
  • the output enables the OE terminal to transmit, so the current control signal reaches the cascading LED driver chip almost simultaneously; Figure 2 and Figure 3 show the prior art. It can be seen that if there are 4 chips connected in series, 64 CLKs are required.
  • the current setting is completed; thus, the present invention is much faster than cascading serial input from the data input terminal DI in the prior art shown in FIG. 3, which improves the system response performance and makes full use of hardware resources.
  • control state data of the respective output pins OUT1_OUTM of the N LED constant current driving chips are input from the data input terminal DI of the first LED constant current driving chip.
  • the output current is controlled by the following control method:
  • the current control signal includes clock and current control data:
  • the LED display constant current drive control system operates in a non-current adjustment state and a current adjustment state;
  • the non-current adjustment state if the current control data is high at the rising edge of the clock signal, then enter Current adjustment status. After entering the current adjustment state, the subsequent current control data is written into each LED constant current driving chip in the LED display constant current driving control system, and the LED display constant current driving control system exits the current adjustment state after completion; the LED display constant current
  • Each LED constant current driving chip in the driving control system realizes adjustment of the output current of the N driving output pins OUT1 - OUTM of each LED constant current driving chip in the LED display constant current driving control system according to the current control data.
  • the current control signal has 6 bits as an example.
  • the system includes two working states: (1) non-current adjustment state, and (2) current adjustment state.
  • the current adjustment state In the non-current adjustment state, if LE is high at the rising edge of CLK (DO is high), the current adjustment state is entered. After entering the current adjustment state, the subsequent 6 bits are written into the LED constant current driving chip, and the LED constant current driving is performed. The chip adjusts the output current of OUT1 -OUTN according to these 6 bits. This method can call up to 64 current values. After the current adjustment state has passed 7 CLKs, it returns to the non-current regulation state.
  • the current control signal includes a clock and a level
  • the LED display constant current drive control system includes two working states: a non-current adjustment state and a current adjustment state.
  • each LED constant current driving chip in the LED display constant current driving control system passes the clock to power Flat width count, after completion, LED constant current drive control system LED constant current drive chip exit current adjustment state; LED display constant current drive control system LED constant current drive chip according to the count value to achieve constant LED display
  • the output current of the N drive output pins OUT1_OUTM of each LED constant current drive chip in the flow drive control system is adjusted.
  • the system includes two operating states: (1) non-current adjustment state, and (2) current regulation state.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

Disclosed are an LED display screen constant current drive control and an output current control method therefor. The LED display screen constant current drive control system comprises an N-number of cascaded LED constant current driver chips, a clock (CLK) terminal, a data latch (LE) terminal, and an output enable (OE) terminal. Clock (CLK) pins of the N-number of LED constant current driver chips are connected with each other and are convergedly connected to the clock (CLK) terminal; data latch (LE) pins of the N-number of LED constant current driver chips are connected with each other and are convergedly connected to the data latch (LE) terminal; output enable (OE) pins of the N-number of LED constant current driver chips are connected with each other and are convergedly connected to the output enable (OE) terminal. Any two or more terminals among the three terminals, namely the output enable (OE) terminal, the data latch (LE) terminal, and the clock (CLK) terminal, serve as current control signal input terminals for input of a current control signal to control an output current of output (OUT1-OUTM) pins of the N-number of LED constant current driver chips. DRAWING: Fig. 1: AA LED array

Description

说 明 书  Description
一种 LED显示屏恒流驱动控制***及其输出电流控制方法 技术领域  Constant current driving control system for LED display screen and output current control method thereof
本发明涉及一种 LED驱动控制技术， 尤其涉及一种具有快速设置功能的恒 流 LED显示屏驱动控制***及其控制数据设置方法。  The invention relates to an LED driving control technology, in particular to a constant current LED display driving control system with a quick setting function and a control data setting method thereof.
背景技术 Background technique
显示屏是人们接收各种信息的重要媒介之一。 作为一种多媒体显示终端， 显示屏有一个重要指标， 即显示屏的快速响应能力。 传统的 LED恒流驱动芯片 的电流控制信号都采用移位寄存模块逐级串行传输， 由于移位寄存模块是以字 作为处理单位， 字长越长， 处理时间也越长； 通常电流控制信号位数都小于字 长， 这样传送小于字长的数据也需经过整个字的传送时间， 这样就限制了小于 字长的数据信息的传输速度， 特别是当多个 LED恒流驱动芯片级联时， 延迟更 为明显， 级联越多， 延迟就越严重， 使得数据传输效率下降， LED显示控制系 统的快速响应能力亦受到限制， ***功能不易扩展。  The display is one of the important media for people to receive a variety of information. As a multimedia display terminal, the display has an important indicator, that is, the display's quick response capability. The current control signals of the traditional LED constant current driving chip are serially transmitted by the shift register module. Since the shift register module uses words as the processing unit, the longer the word length, the longer the processing time; usually the current control signal The number of bits is less than the word length, so that the data transmitted less than the word length also needs to pass the transmission time of the entire word, which limits the transmission speed of the data information smaller than the word length, especially when multiple LED constant current driving chips are cascaded. The delay is more obvious. The more the cascading, the more serious the delay, the lower the data transmission efficiency, the faster the response capability of the LED display control system, and the system function is not easy to expand.
发明内容 Summary of the invention
有鉴于此， 有必要针对上述问题， 提供一种 LED显示屏恒流驱动控制*** 及其输出电流控制方法。  In view of this, it is necessary to provide a LED display constant current drive control system and an output current control method thereof in response to the above problems.
本发明采用以下技术方案： 一种 LED显示屏恒流驱动控制***， 包括 N 个级联的 LED恒流驱动芯片、时钟 CLK端、数据锁存 LE端、输出使能 OE端， 其中第一 LED恒流驱动芯片的数据输出 DO引脚与第二 LED恒流驱动芯片的数 据输入 DI引脚相连， 第二 LED恒流驱动芯片的数据输出 DO引脚与第三 LED 恒流驱动芯片的数据输入 DI引脚相连， 这样级联到第 N个 LED驱动芯片； 所 述 N个 LED恒流驱动芯片的时钟 CLK引脚相互连接，汇接到所述时钟 CLK端； 所述 N个 LED恒流驱动芯片的数据锁存 LE引脚相互连接， 汇接到所述数据锁 存 LE端； 所述 N个 LED恒流驱动芯片的输出使能 OE引脚相互连接， 汇接到 所述输出使能 OE端；所述 N个 LED恒流驱动芯片各自的 M个输出引脚 OUT1 -OUTM与其各自控制的 LED阵列相连； 所述 N个 LED恒流驱动芯片的电源 VDD引脚接到电源上；所述 N个 LED恒流驱动芯片的地 GND引脚接到电源地 上；所述 N个 LED恒流驱动芯片各自的外接电阻 REXT引脚经过各自的电流设 置电阻接到电源地上； 所述输出使能 OE端、 数据锁存 LE端、 时钟 CLK端三 个端子中任何两个端子以上作为电流控制信号输入端子， 用以输入电流控制信 号， 控制所述 N个 LED恒流驱动芯片的输出 OUT1— OUTM引脚的输出电流。 The invention adopts the following technical solutions: A LED display constant current driving control system, comprising N cascaded LED constant current driving chips, a clock CLK end, a data latch LE end, an output enable OE end, wherein the first LED The data output DO pin of the constant current driving chip is connected to the data input DI pin of the second LED constant current driving chip, and the data output DO pin of the second LED constant current driving chip and the data input of the third LED constant current driving chip The DI pins are connected to be connected to the Nth LED driving chip; the clock CLK pins of the N LED constant current driving chips are connected to each other and connected to the clock CLK terminal; the N LED constant current driving The data latches LE pins of the chip are connected to each other and connected to the data latch LE end; the output enable OE pins of the N LED constant current driving chips are connected to each other, and are connected to the output enable OE The M output pins OUT1 -OUTM of the N LED constant current driving chips are connected to their respective controlled LED arrays; the power supply VDD pins of the N LED constant current driving chips are connected to the power supply; The ground GND pin of the N LED constant current driving chip is connected to the power ground The external resistors REXT pins of the N LED constant current driving chips pass through respective current settings The resistor is connected to the power ground; the output enable OE terminal, the data latch LE terminal, and the clock CLK terminal are used as current control signal input terminals for inputting a current control signal to control the N LED constant current driver chip output OUT1 - OUTM pin output current.
在本发明的 LED驱动控制***中， 所述 N个 LED恒流驱动芯片各自的输 出 OUT1— OUTM引脚的控制状态数据从所述第一 LED恒流驱动芯片的数据输 入 DI端输入。  In the LED drive control system of the present invention, the control state data of the output OUT1 - OUTM pins of the respective N LED constant current drive chips are input from the data input DI of the first LED constant current drive chip.
在本发明的 LED驱动控制***中， 所述电流控制信号包括时钟和电流控制 数据。  In the LED drive control system of the present invention, the current control signal includes clock and current control data.
本发明还提供了一种 LED显示屏恒流驱动控制***的输出电流控制方法， 所述 LED显示屏恒流驱动控制***包括 N个级联的 LED恒流驱动芯片、 时钟 CLK端、 数据锁存 LE端、 输出使能 OE端， 其中第一 LED恒流驱动芯片的数 据输出 DO引脚与第二 LED恒流驱动芯片的数据输入 DI引脚相连， 第二 LED 恒流驱动芯片的数据输出 DO引脚与第三 LED恒流驱动芯片的数据输入 DI引 脚相连， 这样级联到第 N个 LED驱动芯片； 所述 N个 LED恒流驱动芯片的时 钟 CLK引脚相互连接， 汇接到所述时钟 CLK端； 所述 N个 LED恒流驱动芯片 的数据锁存 LE引脚相互连接， 汇接到所述数据锁存 LE端； 所述 N个 LED恒 流驱动芯片的输出使能 OE引脚相互连接， 汇接到所述输出使能 OE端； 所述 N 个 LED恒流驱动芯片各自的 M个输出引脚 OUT1 -OUTM与其各自控制的 LED 阵列相连； 所述 N个 LED恒流驱动芯片的电源 VDD引脚接到电源上； 所述 N 个 LED恒流驱动芯片的地 GND引脚接到电源地上；所述 N个 LED恒流驱动芯 片各自的外接电阻 REXT引脚经过各自的电流设置电阻接到电源地上； 输入电 流控制信号时， 用所述输出使能 OE端、 数据锁存 LE端、 时钟 CLK端三个端 子中任何两个以上端子输入电流控制信号，控制所述 N个 LED恒流驱动芯片的 输出 OUT1— OUTM引脚的输出电流。  The invention also provides an output current control method for a constant current drive control system of an LED display screen, wherein the LED display constant current drive control system comprises N cascaded LED constant current driving chips, a clock CLK terminal, and a data latch The LE end and the output enable OE end, wherein the data output DO pin of the first LED constant current driving chip is connected to the data input DI pin of the second LED constant current driving chip, and the data output DO of the second LED constant current driving chip The pin is connected to the data input DI pin of the third LED constant current driving chip, so as to be cascaded to the Nth LED driving chip; the clock CLK pins of the N LED constant current driving chips are connected to each other, and connected to the a clock CLK terminal; the data latch LE pins of the N LED constant current driving chips are connected to each other, and are connected to the data latch LE end; the output of the N LED constant current driving chips is enabled OE The legs are connected to each other and connected to the output enable OE terminal; the M output pins OUT1 - OUTM of the N LED constant current driving chips are connected to their respective controlled LED arrays; the N LED constant current driving chip The power VDD pin is connected to the power supply; the ground GND pin of the N LED constant current driving chips is connected to the power ground; the external resistors REXT pins of the N LED constant current driving chips are respectively set by respective currents. The resistor is connected to the power ground; when the current control signal is input, the current control signal is input by using any one or more of the three terminals of the output enable OE terminal, the data latch LE terminal, and the clock CLK terminal, and the N LEDs are controlled. Constant current drive chip output OUT1 - OUTM pin output current.
在上述方法中： 电流控制信号包括时钟和电流控制数据； 所述 LED显示屏 恒流驱动控制***工作时包括非电流调整状态和电流调整状态两种工作状态； 在非电流调整状态， 如果在时钟信号上升沿时电流控制数据为高， 则进入 电流调整状态， 进入电流调整状态后， 电流控制数据被写入所述 LED显示屏恒 流驱动控制***中的各 LED恒流驱动芯片；完成后，所述 LED显示屏恒流驱动 控制***退出电流调整状态;所述 LED显示屏恒流驱动控制***中的各 LED恒 流驱动芯片根据所述电流控制数据实现对所述 LED显示屏恒流驱动控制***中 的各 LED恒流驱动芯片的 N个驱动输出 OUT1— OUTM引脚的输出电流的调节。 In the above method: the current control signal includes clock and current control data; the LED display constant current drive control system operates in a non-current adjustment state and a current adjustment state; in the non-current adjustment state, if in the clock When the current control data is high at the rising edge of the signal, it enters the current adjustment state. After entering the current adjustment state, the current control data is written into the LED display. Each LED constant current driving chip in the flow driving control system; after completion, the LED display constant current driving control system exits the current adjustment state; the LED constant current driving control system of each LED constant current driving chip is based on The current control data realizes adjustment of an output current of N driving outputs OUT1 - OUTM pins of each LED constant current driving chip in the LED display constant current driving control system.
上述方法也可以是： 电流控制信号包括时钟和电平； 所述 LED显示屏恒流 驱动控制***工作时包括非电流调整状态和电流调整状态两种工作状态；  The method may also be: the current control signal includes a clock and a level; and the LED display constant current drive control system includes two states of operation: a non-current adjustment state and a current adjustment state;
在非电流调整状态， 如果在时钟信号上升沿时， 电平为高， 则进入电流调 整状态， 进入电流调整状态后， 所述 LED显示屏恒流驱动控制***中的各 LED 恒流驱动芯片通过时钟对电平宽度计数； 完成后， 所述 LED显示屏恒流驱动控 制***中的各 LED恒流驱动芯片退出电流调整状态；所述 LED显示屏恒流驱动 控制***中的各 LED恒流驱动芯片根据计数值实现对所述 LED显示屏恒流驱动 控制***中的各 LED恒流驱动芯片的 N个驱动输出 OUT1— OUTM引脚的输出 电流的调节。  In the non-current adjustment state, if the level is high at the rising edge of the clock signal, the current adjustment state is entered, and after entering the current adjustment state, the LED constant current driving chips in the LED display constant current drive control system pass The clock counts the level width; after completion, the LED constant current driving chip in the LED display constant current driving control system exits the current adjustment state; the LED display constant current driving control system LED constant current driving The chip realizes adjustment of the output current of the N driving outputs OUT1 - OUTM pins of the LED constant current driving chips in the LED display constant current driving control system according to the count value.
本发明的有益效果是： 由于输出电流的控制数据不用经芯片逐级串行后才 得到， 因此不受控制字的字长限制， 使得电流控制速度增快， 驱动芯片级联的 越多， 效果更为明显， 这样提高了硬件的利用率， 使***的功能容易扩展， LED 控制***的响应性能亦得到改善。  The beneficial effects of the invention are as follows: Since the control data of the output current is not obtained after serial serialization by the chip, it is not limited by the word length of the control word, so that the current control speed is increased, and the more the driver chip cascades, the effect is obtained. More obvious, this improves the utilization of the hardware, makes the system's functions easy to expand, and the response performance of the LED control system is improved.
附图说明 DRAWINGS
图 1是 LED显示屏恒流驱动控制***示意图 （芯片输出以 16位为例）； 图 2是现有技术中的传输 OUT0— OUT15 (芯片输出以 16位为例） 控制数 据数据时序图；  1 is a schematic diagram of a constant current drive control system of an LED display screen (the chip output is taken as an example of 16 bits); FIG. 2 is a timing diagram of control data data in the prior art for transmitting OUT0_OUT15 (chip output is 16 bits as an example);
图 3是现有技术中的传输电流控制信号时序图；  3 is a timing diagram of a transmission current control signal in the prior art;
图 4是本发明的第一种实施例输出电流控制方法的时序图；  4 is a timing chart of an output current control method of the first embodiment of the present invention;
图 5是本发明的第二种实施例输出电流控制方法的时序图。  Figure 5 is a timing chart of the output current control method of the second embodiment of the present invention.
具体实施方式 detailed description
下面将结合附图和具体的实施例对本发明进行进一步的说明。  The invention will now be further described with reference to the drawings and specific embodiments.
图 1是 LED驱动控制***示意图 （芯片输出以 16位为例）， 从图中可以看 出， N个 LED恒流驱动芯片级联， 其中第一 LED恒流驱动芯片的数据输出引 脚 DO与第二 LED恒流驱动芯片的数据输入引脚 DI相连， 第二 LED恒流驱动 芯片的数据输出引脚 DO与第三 LED恒流驱动芯片的数据输入引脚 DI相连， 这样级联到第 N个 LED驱动芯片； N个 LED恒流驱动芯片的时钟 CLK弓 |脚 相互连接， 汇接到时钟 CLK端； N个 LED恒流驱动芯片的数据锁存 LE引脚 相互连接， 汇接到数据锁存 LE端； N个 LED恒流驱动芯片的输出使能 OE引 脚相互连接， 汇接到输出使能 OE端； N个 LED恒流驱动芯片各自的 M个输 出引脚 OUT1— OUTM与 LED阵列相连； N个 LED恒流驱动芯片的电源引脚 VDD接到电源上； N个 LED恒流驱动芯片的地引脚 GND接到电源地上； N 个 LED恒流驱动芯片各自的外接电阻引脚 REXT经过各自的电流设置电阻接到 电源地上； 输入电流控制信号时， 用输出使能 OE端、 数据锁存 LE端、 时钟 CLK端三个端子中任何两个端子以上作为电流控制信号输入端子， 用以输入电 流控制信号，控制 N个 LED恒流驱动芯片的输出引脚 OUT1— OUTM的输出电 流； 由于电流控制信号不再从数据输入端 DI 串行输入， 而是直接用时钟 CLK 端、 数据锁存 LE端、 输出使能 OE端来传输， 所以电流控制信号几乎同时到达 各个级联 LED驱动芯片； 图 2、 图 3所示为现有技术， 可以看出如果有 4个芯 片串联则需要 64个 CLK才能完成电流设定； 这样采用本发明就比图 3所示现有 技术中电流控制信号从数据输入端 DI级联串行输入要快速得多， 提高了***响 应性能， 充分利用了硬件资源。 Figure 1 is a schematic diagram of the LED drive control system (the chip output is 16 bits as an example). As can be seen from the figure, N LED constant current drive chips are cascaded, and the data output of the first LED constant current drive chip is cited. The pin DO is connected to the data input pin DI of the second LED constant current driving chip, and the data output pin DO of the second LED constant current driving chip is connected to the data input pin DI of the third LED constant current driving chip, so that the cascading To the Nth LED driver chip; the clocks of the N LED constant current driver chips are connected to each other and connected to the clock CLK terminal; the data latches of the N LED constant current driver chips are connected to each other, and connected To the data latch LE end; N LED constant current driver chip output enable OE pin interconnection, sink to the output enable OE terminal; N LED constant current driver chip M output pin OUT1 - OUTM Connected to the LED array; N LED constant current driving chip power pin VDD is connected to the power supply; N LED constant current driving chip ground pin GND is connected to the power ground; N LED constant current driving chip respective external resistor The pin REXT is connected to the power ground through the respective current setting resistors. When the current control signal is input, the output enable OE terminal, the data latch LE terminal, and the clock CLK terminal are used as the current control signal input. Terminal for inputting electricity The control signal controls the output current of the output pins OUT1_OUTM of the N LED constant current driving chips; since the current control signal is no longer serially input from the data input terminal DI, the clock CLK terminal and the data latch LE end are directly used. The output enables the OE terminal to transmit, so the current control signal reaches the cascading LED driver chip almost simultaneously; Figure 2 and Figure 3 show the prior art. It can be seen that if there are 4 chips connected in series, 64 CLKs are required. The current setting is completed; thus, the present invention is much faster than cascading serial input from the data input terminal DI in the prior art shown in FIG. 3, which improves the system response performance and makes full use of hardware resources.
在上述方案中， N个 LED恒流驱动芯片各自的输出引脚 OUT1— OUTM的 控制状态数据从第一 LED恒流驱动芯片的数据输入端 DI输入。  In the above scheme, the control state data of the respective output pins OUT1_OUTM of the N LED constant current driving chips are input from the data input terminal DI of the first LED constant current driving chip.
在上述方案中， 用如下控制方法控制输出电流：  In the above scheme, the output current is controlled by the following control method:
输入电流控制信号时， 用输出使能 OE端、 数据锁存 LE、 时钟 CLK端三个 端子中任何两个以上端子作为电流控制信号输入端，控制 N个 LED恒流驱动芯 片的输出引脚 OUT1— OUTM的输出电流。  When inputting the current control signal, use any two or more terminals of the output enable OE terminal, the data latch LE, and the clock CLK terminal as the current control signal input terminal to control the output pin OUT1 of the N LED constant current driving chips. — OUTM output current.
在上述方法中， 可以是：  In the above method, it can be:
电流控制信号包括时钟和电流控制数据： LED显示屏恒流驱动控制***工 作时包括非电流调整状态和电流调整状态两种工作状态；  The current control signal includes clock and current control data: The LED display constant current drive control system operates in a non-current adjustment state and a current adjustment state;
在非电流调整状态， 如果在时钟信号上升沿时电流控制数据为高， 则进入 电流调整状态。 进入电流调整状态后， 后续的电流控制数据被写入 LED显示屏 恒流驱动控制***中各 LED恒流驱动芯片，完成后 LED显示屏恒流驱动控制系 统退出电流调整状态； LED显示屏恒流驱动控制***中各 LED恒流驱动芯片 根据电流控制数据实现对 LED显示屏恒流驱动控制***中各 LED恒流驱动芯片 的 N个驱动输出引脚 OUT1— OUTM的输出电流的调节。 In the non-current adjustment state, if the current control data is high at the rising edge of the clock signal, then enter Current adjustment status. After entering the current adjustment state, the subsequent current control data is written into each LED constant current driving chip in the LED display constant current driving control system, and the LED display constant current driving control system exits the current adjustment state after completion; the LED display constant current Each LED constant current driving chip in the driving control system realizes adjustment of the output current of the N driving output pins OUT1 - OUTM of each LED constant current driving chip in the LED display constant current driving control system according to the current control data.
如图 4所示， 以电流控制信号有 6bit为例， ***包括两种工作状态： （1 ) 非电流调整状态， （2) 电流调整状态。  As shown in Figure 4, the current control signal has 6 bits as an example. The system includes two working states: (1) non-current adjustment state, and (2) current adjustment state.
在非电流调整状态下如果在 CLK上升沿时 LE为高（DO为高）则进入电流 调整状态， 进入电流调整状态后， 后续的 6个 bit被写入 LED恒流驱动芯片， LED恒流驱动芯片根据这 6个 bit对 OUT1 -OUTN的输出电流进行调节。这种 方法最多可以调出 64种电流值。 在电流调整状态经过 7个 CLK后恢复到非电 流调整状态。  In the non-current adjustment state, if LE is high at the rising edge of CLK (DO is high), the current adjustment state is entered. After entering the current adjustment state, the subsequent 6 bits are written into the LED constant current driving chip, and the LED constant current driving is performed. The chip adjusts the output current of OUT1 -OUTN according to these 6 bits. This method can call up to 64 current values. After the current adjustment state has passed 7 CLKs, it returns to the non-current regulation state.
在上述方法中， 还可以是：  In the above method, it can also be:
电流控制信号包括时钟和电平；  The current control signal includes a clock and a level;
LED显示屏恒流驱动控制***工作时包括非电流调整状态和电流调整状态 两种工作状态；  The LED display constant current drive control system includes two working states: a non-current adjustment state and a current adjustment state.
在非电流调整状态， 如果在时钟信号上升沿时， 电平为高， 则进入电流调 整状， 进入电流调整状态后， LED显示屏恒流驱动控制***中各 LED恒流驱 动芯片通过时钟对电平宽度计数， 完成后 LED 显示屏恒流驱动控制***中各 LED恒流驱动芯片退出电流调整状态； LED显示屏恒流驱动控制***中各 LED 恒流驱动芯片根据计数值实现对 LED显示屏恒流驱动控制***中各 LED恒流驱 动芯片的 N个驱动输出引脚 OUT1— OUTM的输出电流的调节。  In the non-current adjustment state, if the level is high at the rising edge of the clock signal, the current adjustment state is entered, and after entering the current adjustment state, each LED constant current driving chip in the LED display constant current driving control system passes the clock to power Flat width count, after completion, LED constant current drive control system LED constant current drive chip exit current adjustment state; LED display constant current drive control system LED constant current drive chip according to the count value to achieve constant LED display The output current of the N drive output pins OUT1_OUTM of each LED constant current drive chip in the flow drive control system is adjusted.
如图 5所示， ***包括两种工作状态： （1 ) 非电流调整状态， （2) 电流调 整状态。  As shown in Figure 5, the system includes two operating states: (1) non-current adjustment state, and (2) current regulation state.
在非电流调整状态下如果在 CLK上升沿时 LE为高则进入电流调整状态， 进入电流调整状态后， 通过 CLK对 LE的高电平进行计数， LED恒流驱动芯片 根据计数值对 OUT1— OUTN 的输出电流进行调节。 这种方法最多可以调出 6 种电流值。 在电流调整状态经过 7个 CLK后恢复到非电流调整状态。 以上所述实施例仅表达了本发明的几种实施方式， 但并不能因此而理解为 对本发明专利范围的限制。 应当指出的是， 对于本领域的普通技术人员来说， 在不脱离本发明构思的前提下， 还可以做出若干变形和改进， 这些都属于本发 明的保护范围。 因此， 本发明专利的保护范围应以所附权利要求为准。 In the non-current adjustment state, if LE is high at the rising edge of CLK, the current adjustment state is entered. After entering the current adjustment state, the high level of LE is counted by CLK, and the LED constant current driving chip drives OUT1_OUTN according to the count value. The output current is adjusted. This method can call up to 6 current values. After the current adjustment state passes 7 CLKs, it returns to the non-current adjustment state. The above-described embodiments are merely illustrative of several embodiments of the invention, but are not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

权 利 要 求 书 claims
1、 一种 LED显示屏恒流驱动控制***， 包括 N个级联的 LED恒流驱动芯 片、 时钟 CLK端、 数据锁存 LE端、 输出使能 OE端， 其特征在于： 其中第一 LED恒流驱动芯片的数据输出 DO引脚与第二 LED恒流驱动芯片的数据输入 DI引脚相连， 第二 LED恒流驱动芯片的数据输出 DO引脚与第三 LED恒流驱 动芯片的数据输入 DI引脚相连， 这样级联到第 N个 LED驱动芯片； 所述 N个 LED恒流驱动芯片的时钟 CLK引脚相互连接， 汇接到所述时钟 CLK端； 所述 个 LED恒流驱动芯片的数据锁存 LE引脚相互连接，汇接到所述数据锁存 LE 端; 所述 N个 LED恒流驱动芯片的输出使能 OE引脚相互连接， 汇接到所述输 出使能 OE端;所述 N个 LED恒流驱动芯片各自的 M个输出引脚 OUT1 - OUTM 与其各自控制的 LED阵列相连；所述 N个 LED恒流驱动芯片的电源 VDD引脚 接到电源上； 所述 N个 LED恒流驱动芯片的地 GND引脚接到电源地上； 所述 个 LED恒流驱动芯片各自的外接电阻 REXT引脚经过各自的电流设置电阻接 到电源地上； 所述输出使能 OE端、 数据锁存 LE端、 时钟 CLK端三个端子中 任何两个端子以上作为电流控制信号输入端子， 用以输入电流控制信号， 控制 所述 N个 LED恒流驱动芯片的输出 OUT1— OUTM引脚的输出电流。 1. An LED display constant current drive control system, including N cascaded LED constant current drive chips, a clock CLK terminal, a data latch LE terminal, and an output enable OE terminal. It is characterized by: The first LED constant current driver chip The data output DO pin of the current driver chip is connected to the data input DI pin of the second LED constant current driver chip, and the data output DO pin of the second LED constant current driver chip is connected to the data input DI of the third LED constant current driver chip. The pins are connected, thus cascading to the Nth LED driver chip; The clock CLK pins of the N LED constant current driver chips are connected to each other and connected to the clock CLK terminal; The clock CLK pins of the N LED constant current driver chips The data latch LE pins are connected to each other and connected to the data latch LE terminal; the output enable OE pins of the N LED constant current driver chips are connected to each other and connected to the output enable OE terminal; The M output pins OUT1 - OUTM of each of the N LED constant current drive chips are connected to the LED arrays they control respectively; the power supply VDD pins of the N LED constant current drive chips are connected to the power supply; the N The GND pin of the LED constant current driver chip is connected to the power supply ground; the external resistor REXT pins of each of the LED constant current driver chips are connected to the power supply ground through their respective current setting resistors; the output enable OE terminal, data Any two or more of the three terminals of the latch LE terminal and the clock CLK terminal are used as current control signal input terminals to input the current control signal to control the output of the N LED constant current driver chips OUT1-OUTM pins. current.
2、 根据权利要求 1所述的 LED显示屏恒流驱动控制***， 其特征在于， 所述 N个 LED恒流驱动芯片各自的输出 OUT1— OUTM引脚的控制状态数据从 所述第一 LED恒流驱动芯片的数据输入 DI端输入。 2. The LED display screen constant current drive control system according to claim 1, characterized in that, the control status data of the output OUT1-OUTM pins of each of the N LED constant current drive chips is obtained from the first LED constant current drive chip. The data input DI terminal of the stream driver chip is input.
3、 根据权利要求 1或 2所述的 LED显示屏恒流驱动控制***， 其特征在 于， 所述电流控制信号包括时钟和电流控制数据。 3. The LED display screen constant current drive control system according to claim 1 or 2, characterized in that the current control signal includes a clock and current control data.
4、 一种 LED显示屏恒流驱动控制***的输出电流控制方法， 所述 LED显 示屏恒流驱动控制***包括 N个级联的 LED恒流驱动芯片、 时钟 CLK端、 数 据锁存 LE端、 输出使能 OE端， 其中第一 LED恒流驱动芯片的数据输出 DO 引脚与第二 LED恒流驱动芯片的数据输入 DI引脚相连， 第二 LED恒流驱动芯 片的数据输出 DO引脚与第三 LED恒流驱动芯片的数据输入 DI引脚相连， 这 样级联到第 N个 LED驱动芯片；所述 N个 LED恒流驱动芯片的时钟 CLK引脚 相互连接， 汇接到所述时钟 CLK端； 所述 N个 LED恒流驱动芯片的数据锁存 LE引脚相互连接，汇接到所述数据锁存 LE端；所述 N个 LED恒流驱动芯片的 输出使能 OE引脚相互连接， 汇接到所述输出使能 OE端； 所述 N个 LED恒流 驱动芯片各自的 M个输出引脚 OUT1— OUTM与其各自控制的 LED阵列相连； 所述 N个 LED恒流驱动芯片的电源 VDD引脚接到电源上； 所述 N个 LED恒 流驱动芯片的地 GND引脚接到电源地上； 所述 N个 LED恒流驱动芯片各自的 外接电阻 REXT引脚经过各自的电流设置电阻接到电源地上； 4. An output current control method of an LED display constant current drive control system. The LED display constant current drive control system includes N cascaded LED constant current drive chips, a clock CLK terminal, a data latch LE terminal, The output enable OE terminal, where the data output DO pin of the first LED constant current driver chip is connected to the data input DI pin of the second LED constant current driver chip, and the data output DO pin of the second LED constant current driver chip is connected to The data input DI pin of the third LED constant current driver chip is connected to the Nth LED driver chip; the clock CLK pins of the N LED constant current driver chips are connected to each other and concatenated to the clock CLK. terminal; the data latch LE pins of the N LED constant current driver chips are connected to each other and connected to the data latch LE terminal; the data latch LE pins of the N LED constant current driver chips are The output enable OE pins are connected to each other and connected to the output enable OE terminal; the M output pins OUT1 to OUTM of each of the N LED constant current driver chips are connected to the LED arrays they control respectively; the N The power supply VDD pins of the N LED constant current drive chips are connected to the power supply; the ground GND pins of the N LED constant current drive chips are connected to the power supply ground; the external resistor REXT pins of the N LED constant current drive chips are connected to the power supply ground. The pins are connected to the power ground through their respective current setting resistors;
其特征在于： 输入电流控制信号时， 用所述输出使能 OE端、 数据锁存 LE 端、 时钟 CLK端三个端子中任何两个以上端子输入电流控制信号， 控制所述 N 个 LED恒流驱动芯片的输出 OUT1— OUTM引脚的输出电流。 It is characterized in that: when the current control signal is input, any two or more terminals among the three terminals of the output enable OE terminal, the data latch LE terminal, and the clock CLK terminal are used to input the current control signal to control the constant current of the N LEDs. The output OUT1 of the driver chip is the output current of the OUTM pin.
5、 根据权利要求 4所述 LED显示屏恒流驱动控制***的输出电流控制方 法， 其特征在于： 5. The output current control method of the LED display constant current drive control system according to claim 4, characterized by:
电流控制信号包括时钟和电流控制数据； Current control signals include clock and current control data;
所述 LED显示屏恒流驱动控制***工作时包括非电流调整状态和电流调整 状态两种工作状态； The LED display constant current drive control system includes two working states: non-current adjustment state and current adjustment state;
在非电流调整状态， 如果在时钟信号上升沿时电流控制信号为高， 则进入 电流调整状态， 进入电流调整状态后， 电流控制信号被写入所述 LED显示屏恒 流驱动控制***中的各 LED恒流驱动芯片；完成后，所述 LED显示屏恒流驱动 控制***退出电流调整状态;所述 LED显示屏恒流驱动控制***中的各 LED恒 流驱动芯片根据所述电流控制信号实现对所述 LED显示屏恒流驱动控制***中 的各 LED恒流驱动芯片的 N个驱动输出 OUT1— OUTM引脚的输出电流的调节。 In the non-current adjustment state, if the current control signal is high at the rising edge of the clock signal, it enters the current adjustment state. After entering the current adjustment state, the current control signal is written into each of the LED display constant current drive control systems. LED constant current drive chip; after completion, the LED display constant current drive control system exits the current adjustment state; each LED constant current drive chip in the LED display constant current drive control system implements control according to the current control signal. Adjustment of the output currents of the N drive output OUT1-OUTM pins of each LED constant current drive chip in the LED display constant current drive control system.
6、 根据权利要求 4所述 LED显示屏恒流驱动控制***的输出电流控制方 法， 其特征在于： 6. The output current control method of the LED display constant current drive control system according to claim 4, characterized by:
所述电流控制信号包括时钟和电平； The current control signal includes clock and level;
所述 LED显示屏恒流驱动控制***工作时包括非电流调整状态和电流调整 状态两种工作状态； The LED display constant current drive control system includes two working states: non-current adjustment state and current adjustment state;
在非电流调整状态， 如果在时钟信号上升沿时， 电平为高， 则进入电流调 整状，进入电流调整状态后，所述 LED显示屏恒流驱动控制***中的各 LED恒 流驱动芯片通过时钟对电平宽度计数； 完成后， 所述 LED显示屏恒流驱动控制 ***中的各 LED恒流驱动芯片退出电流调整状态;所述 LED显示屏恒流驱动控 制***中的各 LED恒流驱动芯片根据计数值实现对所述 LED显示屏恒流驱动控 制***中的各 LED恒流驱动芯片的 N个驱动输出 OUT1 -OUTM引脚的输出电 流的调节。 In the non-current adjustment state, if the level is high at the rising edge of the clock signal, it enters the current adjustment state. After entering the current adjustment state, each LED constant current drive chip in the LED display constant current drive control system passes The clock counts the level width; after completion, each LED constant current drive chip in the LED display constant current drive control system exits the current adjustment state; the LED display constant current drive control system Each LED constant current drive chip in the control system realizes adjustment of the output current of the N drive output OUT1-OUTM pins of each LED constant current drive chip in the LED display constant current drive control system according to the count value.
PCT/CN2012/075616 2012-05-16 2012-05-16 Led display screen constant current drive control system and output current control method therefor WO2013170460A1 (en)

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US9781800B2 (en) 2015-05-21 2017-10-03 Infineon Technologies Ag Driving several light sources
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