WO2014134843A1 - 一种led背光驱动电路、液晶显示器和驱动方法 - Google Patents

一种led背光驱动电路、液晶显示器和驱动方法 Download PDF

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Publication number
WO2014134843A1
WO2014134843A1 PCT/CN2013/072705 CN2013072705W WO2014134843A1 WO 2014134843 A1 WO2014134843 A1 WO 2014134843A1 CN 2013072705 W CN2013072705 W CN 2013072705W WO 2014134843 A1 WO2014134843 A1 WO 2014134843A1
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Prior art keywords
constant current
driving
led light
drive
chip
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PCT/CN2013/072705
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English (en)
French (fr)
Inventor
张华�
黎飞
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US13/880,077 priority Critical patent/US20140252984A1/en
Publication of WO2014134843A1 publication Critical patent/WO2014134843A1/zh
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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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • 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
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/024—Scrolling of light from the illumination source over the display in combination with the scanning of the display screen

Definitions

  • the present invention relates to the field of liquid crystal display, and more particularly to an LED backlight driving circuit, a liquid crystal display device, and a driving circuit.
  • SPI Serial Peripheral Interface
  • the SPI method sequentially encodes the current duty (duty) and the delay time (phase delay) of each LED string on the output data signal (SDA), and transmits it to the constant current driving chip, and the constant current driving chip. Then, the current duty ratio (duty) and the delay time (phase delay) data of each LED string are decoded by the chip select signal to the corresponding LED string, and the constant current driving chip completes the LED backlight driving.
  • the SPI mode the amount of data processed by the constant current driver chip is large, and a large amount of memory is required to store data, resulting in an increase in cost.
  • the technical problem to be solved by the present invention is to provide a low-cost LED backlight driving circuit, a liquid crystal display device and a driving circuit.
  • An LED backlight driving circuit comprises a timing control module, an LED light bar, and a driving module coupled with an LED light bar output end, wherein the driving module comprises at least one constant current driving chip for driving the LED light bar display, and the timing control module sequentially outputs Driving a signal to the constant current driving chip; the driving signal includes sequentially arranged data units, each data unit includes a current duty ratio and a delay time of one LED strip; the constant current driving chip directly reads according to the corresponding The data unit data drives the display of the LED strips.
  • the constant current driving chip is provided with a signal input pin and a signal output pin;
  • the sequence control module is provided with a first signal line and a second signal line;
  • the constant current driving chip has at least two, and each constant current driving chip is connected in series; the signal input pin of each constant current driving chip is the same as the previous one.
  • the signal output pin or the first signal line of the constant current driving chip is connected; the signal output pin of each constant current driving chip is connected with the signal input pin or the second signal line of the constant current driving chip of the subsequent stage.
  • SLI serial transmission interface
  • each of the constant current driving chips is connected with two LED light strips; the driving signal further includes a data packet, and each data packet includes a data unit corresponding to two adjacent LED light strips.
  • the technical scheme selects a dual-channel constant current driving chip, and the current duty ratio and the delay time of each LED string are transmitted to each LED string in a set order, and only two adjacent LED lights are placed in one data packet. According to the data of the strips, the number of LED strips can be matched with the corresponding number of dual-channel constant current driving chips to complete the LED backlight driving in 3D mode.
  • the constant current driving chip is provided with a signal input pin and a signal output pin;
  • the timing control module is provided with a first signal line and a second signal line; the first signal line and the constant current driving A signal input pin of the chip is coupled; the second signal line is coupled to a signal output pin of the constant current driving chip.
  • a liquid crystal display device comprising an LED backlight driving circuit according to the present invention.
  • a driving method of an LED backlight driving circuit according to the present invention includes the steps of:
  • the timing control module generates a driving signal, where the driving signal includes data units sequentially arranged in series, each data unit includes a current duty ratio and a delay time of one LED light bar;
  • the constant current driving chip of the driving module directly reads the current duty ratio and the delay time of the corresponding data unit. Between, then drive the LED light bar display.
  • the driving signal is divided into at least one data packet, and each data packet includes a data unit corresponding to two adjacent LED light bars;
  • each of the constant current driving chips is connected with two LED light bars.
  • the technical scheme selects a dual-channel constant current driving chip, and the current duty ratio and the delay time of each LED string are transmitted to each LED string in a set order, and only two adjacent LED lights are placed in one data packet. According to the data of the strips, the number of LED strips can be matched with the corresponding number of dual-channel constant current driving chips to complete the LED backlight driving in 3D mode.
  • the constant current driving chip has at least two, and the driving signal is sequentially transmitted from the most front-aligned constant current driving chip to the last constant current driving chip, and each constant current driving chip is driven.
  • the information reads the current duty cycle and delay time information of the respective corresponding data unit, and then drives the LED strip display.
  • SLI Serial Lighting Interface
  • This is a technical solution in which a plurality of constant current driving chips are connected in series, and a SLI (Serial Lighting Interface) data transmission interface mode is adopted between the timing control module and the constant current driving chip, and only one-way data transmission of the cartridge is required, and each LED is The current duty cycle delay time of the light bar is transmitted to the constant current driving chip corresponding to each LED light bar according to the set order.
  • the technical solution can flexibly adjust the number of data units according to the number of LED light bars, and the data format is simple. , versatility.
  • the constant current driving chip drives the LED light bar display according to the current duty ratio and the delay time information of the respective data units.
  • the constant current driving chips After all the constant current driving chips read the driving signal, they will be unified, so that everyone will time on the same time base, and after driving the predetermined delay time, respectively drive each LED light bar, so that the delay between different LED light bars.
  • the time is not affected by the data transmission delay, the control precision is higher, and it is closer to the ideal display effect, which is beneficial to improve the quality of the 3D display picture.
  • each data unit includes a duty ratio and a delay time of one LED strip, that is, the data of the first string of LED strips is placed at the front when encoding, and subsequent
  • the duty cycle (duty) and delay time (phase delay) data of the LED strip are sequentially placed, and the constant current driving chip of the driving module can directly read the data belonging to itself from the driving signal.
  • the current duty cycle and delay time data of the unit so that the current duty cycle and the delay time data are sequentially given to the corresponding IC channel, without storing a large amount of driving signals in advance, and then performing operations such as complicated chip selection and decoding, thereby reducing
  • the data storage space, the data processing method is consolidated, which is conducive to saving hardware cost and design and development cost;
  • the constant current driving chip directly reads the driving signal, the LED light bar can be controlled, according to the string of the LED light bar.
  • the number is flexible and multiple identical constant current driving chips are used for cascade control to increase material sharing.
  • FIG. 1 is a schematic diagram of a conventional LED backlight driving circuit
  • FIG. 2 is a schematic diagram of the principle of the LED backlight driving circuit of the present invention.
  • Embodiment 1 of the present invention is a schematic circuit diagram of Embodiment 1 of the present invention.
  • FIG. 4 is a schematic diagram of a method according to Embodiment 2 of the present invention.
  • the present invention discloses a liquid crystal display device.
  • the liquid crystal display device includes an LED backlight driving circuit.
  • the LED backlight driving circuit includes a timing control module 10, an LED light bar 20, and a driving module 30 coupled to the LED light bar output end.
  • the driving module 30 includes at least one constant current driving chip 31 for driving the LED light bar display, and the timing control module sequentially outputs the driving signal to the constant current driving chip;
  • the driving signal includes data units arranged in sequence, each data unit includes a current duty ratio and a delay time of one LED strip; the constant current driving chip directly reads the display of the LED strip according to the data of the corresponding data unit.
  • each data unit includes a duty ratio and a delay time of one LED strip, that is, the data of the first string of LED strips is placed at the front when encoding, and subsequent
  • the duty cycle (duty) and delay time (phase delay) data of the LED strip are sequentially placed, and the constant current driving chip of the driving module can directly read the current duty ratio and delay of the data unit belonging to itself from the driving signal.
  • Time data such that the current duty cycle and delay time data are sequentially given
  • the corresponding IC channel does not need to store a large number of driving signals in advance, and then through complicated chip selection and decoding operations, the data storage space is reduced, and the data processing mode is compressed, which is conducive to saving hardware cost and design development cost; Since the constant current driving chip directly reads the driving signal, the LED light bar can be controlled. According to the number of LED strips, multiple identical constant current driving chips can be flexibly selected for cascade control, thereby increasing material sharing.
  • the LED backlight driving circuit of the embodiment includes a timing control module 10, an LED light bar 20, and a driving module 30 coupled to an output end of the LED light bar 20.
  • the driving module 30 includes at least one driving LED light bar 20 for display.
  • the constant current driving chip 31, the timing control module 10 sequentially outputs a driving signal to the constant current driving chip 31; the driving signal includes sequentially arranged data units, each data unit including a current duty ratio and a delay time of one LED light bar 20;
  • the constant current driving chip 31 directly reads the display of the LED strip 20 according to the data of the corresponding data unit.
  • the constant current driving chip 31 is provided with a signal input pin 32 and a signal output pin 33; the timing control module 10 is provided with a first signal line SI and a second signal line SO; and the constant current driving chip 31 has a plurality of, for example, two, Four, eight, etc., each of the constant current driving chips 31 are connected in series; the signal input pin 32 of each constant current driving chip 31 is followed by the signal output pin 33 of the constant current driving chip 31 of the previous stage or the first The signal line SI is connected; the signal output pin 33 of each constant current driving chip 31 is connected to the signal input pin 32 or the second signal line SO of the constant current driving chip 31 of the subsequent stage.
  • Each of the constant current driving chips 31 is connected with two LED strips 20; the driving signal further includes a data packet, and each data packet includes a data unit corresponding to two adjacent LED strips 20.
  • a dual channel constant current is selected.
  • the driving chip 31 transmits the current duty ratio and the delay time of each LED string to each LED string in a set order, and only data of two adjacent LED light strips 20 are placed in one data packet, according to the LED light.
  • the number of strings of the strip 20 is matched with the corresponding number of dual-channel constant current driving chips 31, and the LED backlight driving in the 3D mode can be completed.
  • the present invention can also select a single-channel or three-channel constant current driving chip 31.
  • a plurality of constant current driving chips 31 are connected in series, and a sequential transmission interface (SLI) data transmission interface is adopted between the timing control module 10 and the constant current driving chip 31, and only one-way data transmission of the single-segment is required.
  • the current duty cycle delay time of each LED light bar 20 is transmitted to the constant current driving chip 31 corresponding to each LED light bar 20 in the set order.
  • the technical solution can flexibly adjust the data according to the number of LED light bars 20.
  • the number of units, the data format is simple, and the versatility is strong.
  • the embodiment further discloses a driving method of the LED backlight driving circuit of the present invention, comprising the steps of:
  • the timing control module generates a driving signal, and the driving signal includes data units sequentially arranged in series, each data unit including a current duty ratio and a delay time of one LED strip;
  • the constant current driving chip of the driving module directly reads the current duty ratio and delay time of the corresponding data unit, and then drives the LED light bar display.
  • the constant current driving chip can be either single channel or multiple channels.
  • a dual channel constant current driving chip is selected, that is, each constant current driving chip is connected with two LED light bars.
  • step 1 includes: dividing the driving signal into at least one data packet, and each data packet includes a data unit corresponding to two adjacent LED light bars.
  • the dual-channel constant current driving chip is selected, and the current duty ratio and delay time of each LED string are transmitted to each LED string in a set order, and only data of two adjacent LED light bars are placed in one data packet. According to the number of LED strips and the corresponding number of dual-channel constant current driving chips, the LED backlight driving in 3D mode can be completed.
  • step 2 there may be multiple constant current driving chips, and the driving signals are sequentially transmitted from the most front-aligned constant current driving chip to the last constant current driving chip, and each constant current driving chip reads each from the driving information.
  • the current duty cycle and delay time information for the corresponding data unit is then driven to display the LED strip.
  • the technology scheme of multiple constant current driving chips is used in series, and the SLI (Serial Lighting Interface) data transmission interface mode is adopted between the timing control module and the constant current driving chip, and only the single order is required.
  • the one-way data transmission, the current duty cycle delay time of each LED light bar is transmitted to the constant current driving chip corresponding to each LED light bar according to the set order, and the technical solution can be flexibly adjusted according to the number of LED light bars.
  • step 2 after all the constant current driving chips receive the driving signals, the constant current driving chip drives the LED light bar display according to the current duty ratio and the delay time information of the respective data units. After all the constant current driving chips read the driving signal, they will be unified, so that everyone will time on the same time base, and after driving the predetermined delay time, respectively drive each LED strip, so that the delay between different LED strips The time is not affected by the data transmission delay, the control precision is higher, and it is closer to the ideal display effect, which is beneficial to improve the quality of the 3D display picture.
  • This embodiment discloses an LED backlight driving circuit using a single constant current driving chip.
  • the LED backlight driving circuit comprises a timing control module, an LED light bar, and a driving module coupled with the LED light bar output end.
  • the driving module comprises at least one constant current driving chip for driving the LED light bar display, and the timing control module sequentially outputs the driving signal to the constant current.
  • the driving chip includes a data unit arranged in sequence, each data unit includes a current duty ratio and a delay time of one LED strip; and the constant current driving chip directly reads the display of the LED strip according to the data of the corresponding data unit.
  • the constant current driving chip is provided with a signal input pin and a signal output pin;
  • the timing control module is provided with a first signal line and a second signal line;
  • the first signal line is coupled with a signal input pin of the constant current driving chip;
  • the second signal The line is coupled to the signal output pin of the constant current driver chip.

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  • Physics & Mathematics (AREA)
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Abstract

一种LED背光驱动电路，所述LED背光驱动电路包括时序控制模块（10）、LED灯条（20）、以及与LED灯条输出端耦合的驱动模块（30）；所述驱动模块（30）包括至少一个驱动LED灯条进行显示的恒流驱动芯片（31），所述时序控制模块（10）依次输出驱动信号到所述恒流驱动芯片（31），所述驱动信号包括依次排列的数据单元，每个数据单元包括一条LED灯条（20）的电流占空比和延迟时间，所述恒流驱动芯片（31）直接读取根据相应数据单元的数据以驱动LED灯条（20）的显示。还提供了一种包括该LED背光驱动电路的液晶显示装置以及一种LED背光驱动电路的驱动方法。

Description

一种 LED背光驱动电路、 液晶显示器和驱动方法
【技术领域】
本发明涉及液晶显示领域， 更具体的说， 涉及一种 LED背光驱动电路、 液 晶显示装置和驱动电路。
【背景技术】
目前市面上的快门式（ Shutter Glass ) 3D液晶电视， 都是使用串行外设接 口 （ Serial Peripheral Interface , 以下筒称 SPI )数据传输接口方式来控制 LED背 光驱动电路。 如图 1所示， SPI方式是将各 LED串的电流占空比（duty )和延迟 时间（ phase delay )依次编码在输出数据信号（ SDA )上， 传送给恒流驱动芯片， 恒流驱动芯片再通过片选信号解码出各 LED 串的电流占空比（duty )和延迟时 间（ phase delay )数据给对应的 LED串， 恒流驱动芯片完成 LED背光驱动。 SPI 方式中， 恒流驱动芯片处理的数据量大， 需要有大容量的内存来储存数据， 造 成成本上升。
【发明内容】
本发明所要解决的技术问题是提供一种低成本的 LED背光驱动电路、 液晶 显示装置和驱动电路。
本发明的目的是通过以下技术方案来实现的：
一种 LED背光驱动电路， 包括时序控制模块、 LED灯条、 与 LED灯条输 出端耦合的驱动模块， 驱动模块包括至少一个驱动 LED灯条显示的恒流驱动芯 片， 所述时序控制模块依次输出驱动信号到所述恒流驱动芯片； 所述驱动信号 包括依次排列的数据单元， 每个数据单元包括一条 LED灯条的电流占空比和延 迟时间； 所述恒流驱动芯片直接读取根据相应数据单元的数据驱动 LED灯条的 显示。
进一步的， 所述恒流驱动芯片设有信号输入引脚和信号输出引脚； 所述时 序控制模块设有第一信号线和第二信号线； 所述恒流驱动芯片至少有两个， 每 个恒流驱动芯片之间串联联接； 每个恒流驱动芯片的信号输入引脚跟前一级的 恒流驱动芯片的信号输出引脚或第一信号线连接； 每个恒流驱动芯片的信号输 出引脚跟后一级的恒流驱动芯片的信号输入引脚或第二信号线连接。 此为采用 多个恒流驱动芯片串联的技术方案，时序控制模块和恒流驱动芯片之间采用 SLI ( Serial lighting interface )数据传输接口方式，只需要进行筒单的单向数据传输， 将各 LED灯条的电流占空比延迟时间按照设定好的顺序，传送给各 LED灯条对 应的恒流驱动芯片， 本技术方案可根据 LED灯条的数量灵活调整数据单元的数 量， 数据格式筒单， 通用性强。
进一步的， 所述恒流驱动芯片有四个。 此为一种具体的多个恒流驱动芯片 串联的技术方案。
进一步的， 所述每个恒流驱动芯片连接有两条 LED灯条； 所述驱动信号还 包括数据包， 每个数据包包括相邻两条 LED灯条对应的数据单元。 本技术方案 选用双通道的恒流驱动芯片， 将各 LED串的电流占空比和延迟时间按照设定好 的顺序，传送给各 LED串，并且一个数据包里面只放置相邻两串 LED灯条的数 据， 根据 LED灯条的串数搭配对应数量的双通道恒流驱动芯片， 即可完成 3D 模式下的 LED背光驱动。
进一步的， 所述恒流驱动芯片设有信号输入引脚和信号输出引脚； 所述时 序控制模块设有第一信号线和第二信号线； 所述第一信号线和所述恒流驱动芯 片的信号输入引脚耦合； 所述第二信号线和所述恒流驱动芯片的信号输出引脚 耦合。 此为一种采用单个恒流驱动芯片的实施方式。
一种液晶显示装置， 包括本发明所述的一种 LED背光驱动电路。
一种如本发明所述的 LED背光驱动电路的驱动方法， 包括步骤：
A、 时序控制模块生成驱动信号， 驱动信号包括依次串行排列的数据单元， 每个数据单元包括一条 LED灯条的电流占空比和延迟时间；
B、驱动模块的恒流驱动芯片直接读取对应数据单元的电流占空比和延迟时 间， 然后驱动 LED灯条显示。
进一步的， 所述步骤 A中： 将驱动信号分为至少一个数据包， 每个数据包 包括相邻两条 LED灯条对应的数据单元；
所述步骤 B中， 每个恒流驱动芯片连接有两条 LED灯条。 本技术方案选用 双通道的恒流驱动芯片， 将各 LED串的电流占空比和延迟时间按照设定好的顺 序， 传送给各 LED串， 并且一个数据包里面只放置相邻两串 LED灯条的数据， 根据 LED灯条的串数搭配对应数量的双通道恒流驱动芯片， 即可完成 3D模式 下的 LED背光驱动。
进一步的， 所述步骤 B 中， 恒流驱动芯片至少有两个， 驱动信号从排列最 靠前的恒流驱动芯片开始依次传递给排列最后的恒流驱动芯片， 每个恒流驱动 芯片从驱动信息中读取各自的对应的数据单元的电流占空比和延迟时间信息， 然后驱动 LED灯条显示。 此为采用多个恒流驱动芯片串联的技术方案， 时序控 制模块和恒流驱动芯片之间采用 SLI ( Serial lighting interface )数据传输接口方 式， 只需要进行筒单的单向数据传输， 将各 LED灯条的电流占空比延迟时间按 照设定好的顺序， 传送给各 LED灯条对应的恒流驱动芯片， 本技术方案可根据 LED灯条的数量灵活调整数据单元的数量， 数据格式筒单， 通用性强。
进一步的， 所述步骤 B 中， 等到所有的恒流驱动芯片都收到驱动信号后， 恒流驱动芯片根据各自数据单元的电流占空比和延迟时间信息驱动 LED灯条显 示。 等所有的恒流驱动芯片都读取到驱动信号以后再统一动作， 这样大家都在 相同的时间基准上计时， 达到预定的延迟时间后分别驱动各个 LED灯条， 这样 不同 LED灯条之间延迟时间不会受到数据传输延时的影响， 控制精度更高， 更 接近理想的显示效果， 有利于提高 3D显示画面的品质。
本发明由于将驱动信号分解成依次排列的数据单元， 每个数据单元包括一 条 LED灯条的占空比和延迟时间，即编码时将第一串 LED灯条的数据放在最前 面， 后续各 LED灯条的电流占空比（ duty )和延迟时间（ phase delay )数据依次 放置， 驱动模块的恒流驱动芯片就可以直接从驱动信号中读出属于自身的数据 单元的电流占空比和延迟时间数据， 这样电流占空比和延迟时间数据顺序给到 对应的 IC通道， 不需事先存储大量的驱动信号， 然后再通过复杂的片选、 解码 等操作， 降低了数据存储空间， 筒化了数据处理方式， 有利于节约硬件成本及 设计开发成本； 另外， 由于恒流驱动芯片直接读取驱动信号就能实现 LED灯条 的控制， 可根据 LED灯条的串数灵活选用多颗相同的恒流驱动芯片进行级联控 制， 增加物料共用性。
【附图说明】
图 1是现有的 LED背光驱动电路示意图；
图 2是本发明 LED背光驱动电路的原理示意图；
图 3是本发明实施例一的电路示意图；
图 4是本发明实施例二的方法示意图；
【具体实施方式】
如图 2所示， 本发明公开一种液晶显示装置， 液晶显示装置包括 LED背光 驱动电路， LED背光驱动电路包括时序控制模块 10、 LED灯条 20、 与 LED灯 条输出端耦合的驱动模块 30, 驱动模块 30包括至少一个驱动 LED灯条显示的 恒流驱动芯片 31 , 时序控制模块依次输出驱动信号到恒流驱动芯片；
驱动信号包括依次排列的数据单元， 每个数据单元包括一条 LED灯条的电 流占空比和延迟时间； 恒流驱动芯片直接读取根据相应数据单元的数据驱动 LED灯条的显示。
本发明由于将驱动信号分解成依次排列的数据单元， 每个数据单元包括一 条 LED灯条的占空比和延迟时间，即编码时将第一串 LED灯条的数据放在最前 面， 后续各 LED灯条的电流占空比（ duty )和延迟时间（ phase delay )数据依次 放置， 驱动模块的恒流驱动芯片就可以直接从驱动信号中读出属于自身的数据 单元的电流占空比和延迟时间数据， 这样电流占空比和延迟时间数据顺序给到 对应的 IC通道， 不需事先存储大量的驱动信号， 然后再通过复杂的片选、 解码 等操作， 降低了数据存储空间， 筒化了数据处理方式， 有利于节约硬件成本及 设计开发成本； 另外， 由于恒流驱动芯片直接读取驱动信号就能实现 LED灯条 的控制， 可根据 LED灯条的串数灵活选用多颗相同的恒流驱动芯片进行级联控 制， 增加物料共用性。
下面结合附图和较佳的实施例对本发明作进一步说明。
实施例一
如图 3所示，本实施例的 LED背光驱动电路包括时序控制模块 10、 LED灯 条 20、 与 LED灯条 20输出端耦合的驱动模块 30, 驱动模块 30包括至少一个 驱动 LED灯条 20显示的恒流驱动芯片 31 ,时序控制模块 10依次输出驱动信号 到恒流驱动芯片 31; 驱动信号包括依次排列的数据单元， 每个数据单元包括一 条 LED灯条 20的电流占空比和延迟时间； 恒流驱动芯片 31直接读取根据相应 数据单元的数据驱动 LED灯条 20的显示。
恒流驱动芯片 31设有信号输入引脚 32和信号输出引脚 33; 时序控制模块 10设有第一信号线 SI和第二信号线 SO; 恒流驱动芯片 31有多个， 如两个、 四 个、 八个等， 每个恒流驱动芯片 31之间串联联接； 每个恒流驱动芯片 31的信 号输入引脚 32跟前一级的恒流驱动芯片 31的信号输出引脚 33或第一信号线 SI 连接； 每个恒流驱动芯片 31的信号输出引脚 33跟后一级的恒流驱动芯片 31的 信号输入引脚 32或第二信号线 SO连接。
每个恒流驱动芯片 31连接有两条 LED灯条 20; 驱动信号还包括数据包， 每个数据包包括相邻两条 LED灯条 20对应的数据单元， 本实施例选用双通道 的恒流驱动芯片 31 , 将各 LED串的电流占空比和延迟时间按照设定好的顺序， 传送给各 LED串， 并且一个数据包里面只放置相邻两串 LED灯条 20的数据， 根据 LED灯条 20的串数搭配对应数量的双通道恒流驱动芯片 31 , 即可完成 3D 模式下的 LED背光驱动。 当然本发明还可以选用单通道或三通道以上的恒流驱 动芯片 31。 本实施例采用多个恒流驱动芯片 31 串联的技术方案， 时序控制模块 10和 恒流驱动芯片 31之间采用 SLI ( Serial lighting interface )数据传输接口方式， 只 需要进行筒单的单向数据传输， 将各 LED灯条 20的电流占空比延迟时间按照 设定好的顺序， 传送给各 LED灯条 20对应的恒流驱动芯片 31 , 本技术方案可 根据 LED灯条 20的数量灵活调整数据单元的数量， 数据格式筒单， 通用性强。
实施例二
如图 4所示，本实施例还公开一种本发明的 LED背光驱动电路的驱动方法， 包括步骤：
1.生成驱动信号
时序控制模块生成驱动信号， 驱动信号包括依次串行排列的数据单元， 每 个数据单元包括一条 LED灯条的电流占空比和延迟时间；
2. LED灯条显示
驱动模块的恒流驱动芯片直接读取对应数据单元的电流占空比和延迟时 间， 然后驱动 LED灯条显示。
恒流驱动芯片可以选用单通道， 也可以选用多通道， 本实施例选用双通道 的恒流驱动芯片， 即每个恒流驱动芯片连接有两条 LED灯条。 此时步骤 1中包 括： 将驱动信号分为至少一个数据包， 每个数据包包括相邻两条 LED灯条对应 的数据单元。 选用双通道的恒流驱动芯片， 将各 LED串的电流占空比和延迟时 间按照设定好的顺序， 传送给各 LED串， 并且一个数据包里面只放置相邻两串 LED灯条的数据， 根据 LED灯条的串数搭配对应数量的双通道恒流驱动芯片， 即可完成 3D模式下的 LED背光驱动。
步骤 2 中， 恒流驱动芯片可以有多个， 驱动信号从排列最靠前的恒流驱动 芯片开始依次传递给排列最后的恒流驱动芯片， 每个恒流驱动芯片从驱动信息 中读取各自的对应的数据单元的电流占空比和延迟时间信息， 然后驱动 LED灯 条显示。 采用多个恒流驱动芯片串联的技术方案， 时序控制模块和恒流驱动芯 片之间采用 SLI ( Serial lighting interface )数据传输接口方式， 只需要进行筒单 的单向数据传输， 将各 LED灯条的电流占空比延迟时间按照设定好的顺序， 传 送给各 LED灯条对应的恒流驱动芯片，本技术方案可根据 LED灯条的数量灵活 调整数据单元的数量， 数据格式筒单， 通用性强。
步骤 2中， 可以等到所有的恒流驱动芯片都收到驱动信号后， 恒流驱动芯 片再根据各自数据单元的电流占空比和延迟时间信息驱动 LED灯条显示。 等所 有的恒流驱动芯片都读取到驱动信号以后再统一动作， 这样大家都在相同的时 间基准上计时， 达到预定的延迟时间后分别驱动各个 LED灯条， 这样不同 LED 灯条之间延迟时间不会受到数据传输延时的影响， 控制精度更高， 更接近理想 的显示效果， 有利于提高 3D显示画面的品质。
实施例三
本实施例公开一种采用单个恒流驱动芯片的 LED背光驱动电路。
LED背光驱动电路包括时序控制模块、 LED灯条、与 LED灯条输出端耦合 的驱动模块， 驱动模块包括至少一个驱动 LED灯条显示的恒流驱动芯片， 时序 控制模块依次输出驱动信号到恒流驱动芯片； 驱动信号包括依次排列的数据单 元， 每个数据单元包括一条 LED灯条的电流占空比和延迟时间； 恒流驱动芯片 直接读取根据相应数据单元的数据驱动 LED灯条的显示。
恒流驱动芯片设有信号输入引脚和信号输出引脚； 时序控制模块设有第一 信号线和第二信号线； 第一信号线和恒流驱动芯片的信号输入引脚耦合； 第二 信号线和恒流驱动芯片的信号输出引脚耦合。
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明， 不 能认定本发明的具体实施只局限于这些说明。 对于本发明所属技术领域的普通 技术人员来说， 在不脱离本发明构思的前提下， 还可以做出若干筒单推演或替 换， 都应当视为属于本发明的保护范围。

Claims

权利要求
1、 一种 LED背光驱动电路， 包括时序控制模块、 LED灯条、 与 LED灯条 输出端耦合的驱动模块， 所述驱动模块包括至少一个驱动 LED灯条显示的恒流 驱动芯片， 所述时序控制模块依次输出驱动信号到所述恒流驱动芯片；
所述驱动信号包括依次排列的数据单元， 每个数据单元包括一条 LED灯条 的电流占空比和延迟时间； 所述恒流驱动芯片直接读取根据相应数据单元的数 据驱动 LED灯条的显示。
2、 如权利要求 1所述的 LED背光驱动电路， 其中， 所述每个恒流驱动芯 片连接有两条 LED灯条；
所述驱动信号还包括数据包， 每个数据包包括相邻两条 LED灯条对应的数 据单元。
3、 如权利要求 1所述的 LED背光驱动电路， 其中， 所述恒流驱动芯片设 有信号输入引脚和信号输出引脚； 所述时序控制模块设有第一信号线和第二信 号线； 所述恒流驱动芯片至少有两个， 每个恒流驱动芯片之间串联联接； 每个 恒流驱动芯片的信号输入引脚跟前一级的恒流驱动芯片的信号输出引脚或第一 信号线连接； 每个恒流驱动芯片的信号输出引脚跟后一级的恒流驱动芯片的信 号输入引脚或第二信号线连接。
4、 如权利要求 3所述的 LED背光驱动电路， 其中， 所述每个恒流驱动芯 片连接有两条 LED灯条；
所述驱动信号还包括数据包， 每个数据包包括相邻两条 LED灯条对应的数 据单元。
5、 如权利要求 3所述的一种 LED背光驱动电路， 其中， 所述恒流驱动芯 片有四个。
6、 如权利要求 5所述的 LED背光驱动电路， 其中， 所述每个恒流驱动芯 片连接有两条 LED灯条； 所述驱动信号还包括数据包， 每个数据包包括相邻两条 LED灯条对应的数 据单元。
7、 如权利要求 1所述的 LED背光驱动电路， 其中， 所述恒流驱动芯片设 有信号输入引脚和信号输出引脚； 所述时序控制模块设有第一信号线和第二信 号线； 所述第一信号线和所述恒流驱动芯片的信号输入引脚耦合； 所述第二信 号线和所述恒流驱动芯片的信号输出引脚耦合。
8、 一种液晶显示装置， 包括 LED背光驱动电路， 所述 LED背光驱动电路 包括时序控制模块、 LED灯条、 与 LED灯条输出端耦合的驱动模块， 所述驱动 模块包括至少一个驱动 LED灯条显示的恒流驱动芯片， 所述时序控制模块依次 输出驱动信号到所述恒流驱动芯片；
所述驱动信号包括依次排列的数据单元， 每个数据单元包括一条 LED灯条 的电流占空比和延迟时间； 所述恒流驱动芯片直接读取根据相应数据单元的数 据驱动 LED灯条的显示。
9、 如权利要求 8所述的一种液晶显示装置， 其中， 所述每个恒流驱动芯片 连接有两条 LED灯条；
所述驱动信号还包括数据包， 每个数据包包括相邻两条 LED灯条对应的数 据单元。
10、 如权利要求 8所述的一种液晶显示装置， 其中， 所述恒流驱动芯片设 有信号输入引脚和信号输出引脚； 所述时序控制模块设有第一信号线和第二信 号线； 所述恒流驱动芯片至少有两个， 每个恒流驱动芯片之间串联联接； 每个 恒流驱动芯片的信号输入引脚跟前一级的恒流驱动芯片的信号输出引脚或第一 信号线连接； 每个恒流驱动芯片的信号输出引脚跟后一级的恒流驱动芯片的信 号输入引脚或第二信号线连接。
11、 如权利要求 10所述的一种液晶显示装置， 其中， 所述每个恒流驱动芯 片连接有两条 LED灯条；
所述驱动信号还包括数据包， 每个数据包包括相邻两条 LED灯条对应的数 据单元。
12、 如权利要求 10所述的一种液晶显示装置， 其中， 所述恒流驱动芯片有 四个。
13、 如权利要求 12所述的一种液晶显示装置， 其中， 所述每个恒流驱动芯 片连接有两条 LED灯条；
所述驱动信号还包括数据包， 每个数据包包括相邻两条 LED灯条对应的数 据单元。
14、 如权利要求 8所述的一种液晶显示装置， 其中， 所述恒流驱动芯片设 有信号输入引脚和信号输出引脚； 所述时序控制模块设有第一信号线和第二信 号线； 所述第一信号线和所述恒流驱动芯片的信号输入引脚耦合； 所述第二信 号线和所述恒流驱动芯片的信号输出引脚耦合。
15、一种 LED背光驱动电路的驱动方法，所述 LED背光驱动电路包括时序 控制模块、 LED灯条、 与 LED灯条输出端耦合的驱动模块， 所述驱动模块包括 至少一个驱动 LED灯条显示的恒流驱动芯片， 所述时序控制模块依次输出驱动 信号到所述恒流驱动芯片；
所述驱动信号包括依次排列的数据单元， 每个数据单元包括一条 LED灯条 的电流占空比和延迟时间； 所述恒流驱动芯片直接读取根据相应数据单元的数 据驱动 LED灯条的显示
所述驱动方法包括步骤：
A、 时序控制模块生成驱动信号， 驱动信号包括依次串行排列的数据单元， 每个数据单元包括一条 LED灯条的电流占空比和延迟时间；
B、驱动模块的恒流驱动芯片直接读取对应数据单元的电流占空比和延迟时 间， 然后驱动 LED灯条显示。
16、 如权利要求 15所述的 LED背光驱动电路的驱动方法， 其中， 所述步 骤 B 中， 恒流驱动芯片至少有两个， 驱动信号从排列最靠前的恒流驱动芯片开 始依次传递给排列最后的恒流驱动芯片， 每个恒流驱动芯片从驱动信息中读取 各自的对应的数据单元的电流占空比和延迟时间信息，然后驱动 LED灯条显示。
17、 如权利要求 16所述的 LED背光驱动电路的驱动方法， 其中， 所述步 骤 B 中， 等到所有的恒流驱动芯片都收到驱动信号后， 恒流驱动芯片根据各自 数据单元的电流占空比和延迟时间信息驱动 LED灯条显示。
18、 如权利要求 15所述的 LED背光驱动电路的驱动方法， 其中， 所述步 骤 A中： 将驱动信号分为至少一个数据包， 每个数据包包括相邻两条 LED灯条 对应的数据单元；
所述步骤 B中， 每个恒流驱动芯片连接有两条 LED灯条。
19、 如权利要求 18所述的 LED背光驱动电路的驱动方法， 其中， 所述步 骤 B 中， 恒流驱动芯片至少有两个， 驱动信号从排列最靠前的恒流驱动芯片开 始依次传递给排列最后的恒流驱动芯片， 每个恒流驱动芯片从驱动信息中读取 各自的对应的数据单元的电流占空比和延迟时间信息，然后驱动 LED灯条显示。
20、 如权利要求 19所述的 LED背光驱动电路的驱动方法， 其中， 所述步 骤 B 中， 等到所有的恒流驱动芯片都收到驱动信号后， 恒流驱动芯片根据各自 数据单元的电流占空比和延迟时间信息驱动 LED灯条显示。
PCT/CN2013/072705 2013-03-07 2013-03-15 一种led背光驱动电路、液晶显示器和驱动方法 Ceased WO2014134843A1 (zh)

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