WO2014187039A1 - 背光模组驱动电路和显示装置 - Google Patents

背光模组驱动电路和显示装置 Download PDF

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Publication number
WO2014187039A1
WO2014187039A1 PCT/CN2013/082080 CN2013082080W WO2014187039A1 WO 2014187039 A1 WO2014187039 A1 WO 2014187039A1 CN 2013082080 W CN2013082080 W CN 2013082080W WO 2014187039 A1 WO2014187039 A1 WO 2014187039A1
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Prior art keywords
module
signal
driving circuit
backlight module
restart
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PCT/CN2013/082080
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English (en)
French (fr)
Inventor
张斗庆
梁恒镇
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BOE Technology Group Co Ltd
Hefei BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Hefei BOE Optoelectronics Technology Co Ltd
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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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/026—Arrangements or methods related to booting a display
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a backlight module driving circuit and a display device.
  • TFT Thin film field effect transistor
  • Liquid Crysta singer LCD thin film field effect transistor liquid crystal display device
  • the TFT in conjunction with a suitable capacitor and other electronic components, drives the liquid crystal pixels to produce a rich and colorful image.
  • TFT-LCDs are widely used in display products such as televisions, notebook computers, and personal digital assistants because of their thinness, low power consumption, and no radiation.
  • the backlight module driving circuit mistakenly believes that the power supply is faulty, and the drive signal is supplied to the backlight, which causes the backlight module to stop working and affects the display effect of the liquid crystal display device.
  • the technical problem to be solved by the present invention is to provide a backlight module driving circuit and a liquid crystal display device, which can ensure the normal operation of the backlight module driving circuit when the power source signal is at a low level or a long duration.
  • a first aspect of the present invention provides a backlight module driving circuit, including:
  • a determining module when determining that the power signal changes to a predetermined value, sending an abnormal signal to the restarting module; restarting the module, when receiving the abnormal signal from the determining module, the restarting module sends a restart signal to restart the backlight module Drive circuit.
  • the determining module includes a tri-state gate, and the input end of the tri-state gate and the control enable end are connected to the input end of the judging module, and the power supply signal is connected, and the output end of the tri-state gate Connected to the input of the restart module.
  • the restart module includes an AND gate, and the first input end of the AND gate is connected to the restart The input end of the module, the second input end of the AND gate is connected to the comparison signal, and the output end of the AND gate is connected to the output end of the restart module.
  • the comparison signal is at a high level.
  • the backlight module driving circuit further includes: a capacitor, one end of the capacitor is connected to the second input end of the AND gate, and the other end is grounded.
  • the abnormal signal sent by the determining module to the restarting module is a low level signal
  • the restart signal sent by the restarting module is also a low level signal
  • a backlight module driving circuit includes a determining module and a restarting module.
  • the determining module determines that the power signal is lowered
  • the restarting module is notified to restart the backlight module driving. Circuit.
  • the backlight module driving circuit continues to provide a driving signal to the backlight after restarting, thereby ensuring that the backlight module driving circuit can work normally, and the display effect of the liquid crystal display device is ensured. , improve the user experience.
  • a second aspect of the present invention provides a display device including the above-described backlight module driving circuit.
  • FIG. 1 is a schematic structural diagram of a backlight module driving circuit according to an embodiment of the present invention.
  • FIG. 2 is another schematic structural diagram of a backlight module driving circuit according to an embodiment of the present invention.
  • FIG. 1 is a schematic structural diagram of a backlight module driving circuit according to an embodiment of the present invention. As shown in FIG. 1, the backlight module driving circuit includes:
  • the determining module 11 when determining that the power signal Vcc changes to a predetermined value, for example, the falling amplitude is greater than When the preset amplitude or the falling duration is greater than the preset duration, the abnormal signal is sent to the restart module 12; specifically, the power signal Vcc changes to a predetermined value, and the power signal Vcc decreases by more than a preset amplitude or the falling duration is greater than a preset. duration;
  • the restarting module 12 when receiving the abnormal signal from the determining module 11, the restarting module sends a restart signal to restart the backlight module driving circuit.
  • the judging module 11 sends an abnormal signal to the restarting module 12, and then restarts the module 12 to restart the backlight module driving circuit, thereby preventing the backlight module driving circuit from ignoring the power failure and stopping the operation.
  • a backlight module driving circuit includes a judging module and a restarting module.
  • the judging module judges that the falling amplitude of the power signal is greater than a preset amplitude or a falling duration More than the preset duration
  • the restart module is notified to restart the backlight module driving circuit.
  • the backlight module driving circuit continues to provide a driving signal to the backlight after restarting, thereby ensuring that the backlight module driving circuit can work normally, and the display effect of the liquid crystal display device is ensured. , improve the user experience.
  • FIG. 2 is a schematic view showing another structure of a backlight module driving circuit in an embodiment of the present invention.
  • the determining module 11 includes a three-state gate, and the input terminal b of the three-state gate and the control enable terminal c are connected to the input of the determining module 11.
  • the terminal a, the power supply signal Vcc is connected, the output terminal d of the three-state gate is connected to the output end e of the determining module 11;
  • the tri-state gate is selected.
  • the specific structure of the restart module 12 can be various.
  • the restart module 12 includes an AND gate, and the first input end g of the AND gate is connected to the input end f of the restart module 12, and the The second input h of the gate is connected to the comparison signal Vc, and the output i of the AND gate is connected to the output j of the restart module 12.
  • the abnormal signal sent by the determining module 11 to the restarting module 12 is a low level signal
  • the restart signal sent by the restarting module 12 is also a low level signal
  • the backlight module driving circuit works normally.
  • the input terminal b and the control enable terminal c of the tri-state gate are both connected to the high level signal, the tri-state gate is turned on, and the output signal of the output terminal d is consistent with the high level signal input to the input terminal b, so the module 12 is restarted.
  • the first input terminal g of the AND gate is connected to the high level signal, and since the comparison signal Vc in FIG.
  • the output terminal i outputs a high level signal, that is, the output signal of the output terminal j of the restart module 12 is a high level signal.
  • the backlight module driving circuit When the falling amplitude or falling duration of the voltage of the power signal Vcc does not exceed the preset amplitude or the preset duration of the backlight module driving circuit, the backlight module driving circuit operates as usual, and at the same time, the determining module 11 does not send to the restarting module 12 The abnormal signal, the restart module 12 outputs a high level signal as usual.
  • the input terminal b of the tri-state gate of the determination module 11 The control enable terminal c is connected to the power signal Vcc of the low level signal, and the control enable terminal c is low level and cannot open the tristate gate, and the output terminal d of the tristate gate cannot receive the signal, that is, the low level.
  • the determining module 11 sends an abnormal signal to the restart module 12 as a low level; the first input end g of the AND module of the restarting module 12 is connected to the output terminal e of the determining module 11, and receives an abnormal signal of a low level, the AND gate
  • the second input terminal h is connected to the comparison signal Vc, and the comparison signal Vc is always at a high level, that is, the abnormal signal is different from the comparison signal Vc, so the output terminal i of the AND gate outputs a low level signal, that is, a restart signal, and the restart is performed.
  • the backlight module driving circuit ensures the normal operation of the backlight module driving circuit.
  • the backlight module driving circuit may further include a capacitor C1.
  • One end of the capacitor C1 is connected to the second input end h of the AND gate, and the other end is grounded, and the comparison signal is noise-reduced before the comparison signal Vc enters the AND gate to improve the operational reliability of the AND gate restart module 12.
  • an embodiment of the present invention further provides a display device including any of the above backlight module driving circuits.
  • the display device is a liquid crystal display device.

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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 Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

一种背光模组驱动电路和显示装置，能够当电源信号处于的低电平或持续时间过长时，保证背光模组驱动电路的正常工作。该背光模组驱动电路包括：判断模块（11），当判断到电源信号变化到预定值时，向重启模块（12）发送异常信号；重启模块（12，当接收到来自所述判断模块（11）的异常信号时，所述重启模块（12）发出重启信号，重启所述背光模组驱动电路。

Description

背光模组驱动电路和显示装置
技术领域
本发明涉及显示技术领域， 尤其涉及一种背光模组驱动电路和显示装置。
背景技术
薄膜场效应晶体管 （Thin Fi lm Trans i s tor , 筒称 TFT )平面显示屏幕， 特 别是薄膜场效应晶体管液晶显示装置（Liquid Crys ta l Di splay, 筒称 LCD ), 主要是利用呈矩阵状排列的 TFT, 配合适合的电容等电子组件来驱动液晶像素， 以产生色彩丰富靓丽的图像。 由于 TFT-LCD具有外形轻薄、 耗电量少以及无辐 射等特性， 被广泛地应用在电视机、 笔记本电脑、 个人数字助理等显示产品上。
发明人在实现本发明的过程中发现， 液晶显示装置在使用过程中， 电源信 号偶尔会出现抖动， 即从一个稳定的高电平下降到某一低电平； 当电源信号处 于的低电平过低或持续时间过长时， 背光模组驱动电路误以为电源故障， 中止 向背光源提供驱动信号， 导致背光模组停止工作， 影响液晶显示装置的显示效 果。
发明内容
本发明所要解决的技术问题在于提供一种背光模组驱动电路和液晶显示装 置， 能够当电源信号处于的低电平过低或持续时间过长时， 保证背光模组驱动 电路的正常工作。
为解决上述技术问题， 本发明采用如下技术方案：
本发明的第一方面提供了一种背光模组驱动电路， 包括：
判断模块， 当判断电源信号变化到预定值时， 向重启模块发送异常信号； 重启模块， 当接收到来自所述判断模块的异常信号时， 所述重启模块发出 重启信号， 重启所述背光模组驱动电路。
可替换地， 所述判断模块包括三态门， 所述三态门的输入端和控制使能端 连接所述判断模块的输入端， 接入所述电源信号， 所述三态门的输出端连接到 所述重启模块的输入端。
可替换地， 所述重启模块包括与门， 所述与门的第一输入端连接所述重启 模块的输入端， 所述与门的第二输入端接入比较信号， 所述与门的输出端连接 所述重启模块的输出端。
可选择地， 所述比较信号为高电平。
所述的背光模组驱动电路还包括： 电容， 所述电容的一端连接所述与门的 第二输入端， 另一端接地。
可选择地， 判断模块向重启模块发送的异常信号为低电平信号， 重启模块 发出的重启信号也为低电平信号。
在本发明实施例的技术方案中， 提供了一种背光模组驱动电路， 该背光模 组驱动电路包括判断模块和重启模块， 当判断模块判断电源信号降低时， 通知 重启模块重启背光模组驱动电路。 当电源信号处于的低电平过低或持续时间过 长时， 背光模组驱动电路在重启后继续向背光源提供驱动信号， 保证背光模组 驱动电路能够正常工作， 保证了液晶显示装置的显示效果， 提高了用户的使用 体验。
本发明的第二方面提供了一种显示装置， 包括上述的背光模组驱动电路。
附图说明 例描述中所需要使用的附图作筒单地介绍， 显而易见地， 下面描述中的附图仅 仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳 动的前提下， 还可以根据这些附图获得其他的附图。
图 1为本发明实施例中的背光模组驱动电路的一种结构示意图；
图 2为本发明实施例中的背光模组驱动电路的另一种结构示意图。
具体实施方式
下面将结合附图， 对本发明实施例中的技术方案进行清楚、 完整地描述， 显然， 所描述的实施例是本发明一部分实施例， 而不是全部的实施例。 基于本 发明中的实施例， 本领域普通技术人员在没有做出创造性劳动情况下所获得的 所有其他实施例， 都属于本发明保护的范围。
图 1示出本发明实施例的背光模组驱动电路的一种结构示意图。 如图 1所 示， 该背光模组驱动电路包括：
判断模块 11 , 当判断电源信号 Vcc变化到预定值时， 例如， 下降幅度大于 预设幅度或下降持续时长大于预设时长时， 向重启模块 12发送异常信号； 具体 地， 电源信号 Vcc变化到预定值， 可以是电源信号 Vcc下降幅度大于预设幅度 或下降持续时长大于预设时长；
重启模块 12, 当接收到来自所述判断模块 11的异常信号时， 所述重启模块 发出重启信号， 重启所述背光模组驱动电路。
示例性地， 当电源信号 Vcc的下降幅度大于预设幅度（例如大于正常电压 的 0.3倍）或下降持续时长大于预设时长（例如大于 10毫秒）， 超出背光模组驱 动电路的承受极限时， 判断模块 11向重启模块 12发送异常信号， 继而重启模 块 12才能够重启背光模组驱动电路， 防止背光模组驱动电路误以为电源故障而 停止工作。
在本实施例的技术方案中， 提供了一种背光模组驱动电路， 该背光模组驱 动电路包括判断模块和重启模块， 当判断模块判断到电源信号的下降幅度大于 预设幅度或下降持续时长大于预设时长， 通知重启模块重启背光模组驱动电路。 当电源信号处于的低电平过低或持续时间过长时， 背光模组驱动电路在重启后 继续向背光源提供驱动信号， 保证背光模组驱动电路能够正常工作， 保证了液 晶显示装置的显示效果， 提高了用户的使用体验。
图 2示出本发明实施例中的背光模组驱动电路的另一种结构示意图。 本领 域技术人员应当理解， 判断模块 11的具体结构可以有很多种。 在本发明实施例 的一个技术方案中， 如图 2所示， 所述判断模块 11包括三态门， 所述三态门的 输入端 b和控制使能端 c连接所述判断模块 11的输入端 a, 接入所述电源信号 Vcc, 所述三态门的输出端 d连接所述判断模块 11的输出端 e;
由于三态门的控制使能端 c开启三态门所需的电压较低， 仅需要电源信号 Vcc的正常电压即可开启，且该开启电压可以与输入端 b接入的电压一致，无需 高于输入端 b接入的电压， 所以在本发明实施例中， 选择三态门。
类似地， 重启模块 12的具体结构也可以有很多种。 在本发明实施例的一个 技术方案中， 如图 2所示， 所述重启模块 12包括与门， 所述与门的第一输入端 g连接所述重启模块 12的输入端 f,所述与门的第二输入端 h接入比较信号 Vc, 所述与门的输出端 i连接所述重启模块 12的输出端 j。
在本发明实施例中， 判断模块 11向重启模块 12发送的异常信号为低电平 信号， 重启模块 12发出的重启信号也为低电平信号。
如图 2可知， 当电源信号 Vcc正常时， 背光模组驱动电路正常工作。 此时 三态门的输入端 b和控制使能端 c都接入高电平信号， 三态门被开启， 输出端 d 的输出信号与输入端 b接入的高电平信号一致， 因此重启模块 12中的与门的第 一输入端 g接入高电平信号， 由于图 2中的比较信号 Vc为高电平， 即与门的第 二输入端 h也接入高电平信号， 与门的输出端 i输出高电平信号， 即重启模块 12的输出端 j输出信号为高电平信号。
当电源信号 Vcc的电压的下降幅度或下降持续时间并未超出背光模组驱动 电路的预设幅度或预设时长时， 背光模组驱动电路照常工作， 同时， 判断模块 11不向重启模块 12发送异常信号， 重启模块 12照常输出高电平信号。
当电源信号 Vcc的电压的下降幅度大于预设幅度（例如大于正常电压的 0.3 倍）或下降持续时长大于预设时长（例如大于 10毫秒） 时， 判断模块 11的三 态门的输入端 b和控制使能端 c接入为低电平信号的电源信号 Vcc,控制使能端 c为低电平无法开启三态门， 三态门的输出端 d接收不到信号， 即为低电平， 判 断模块 11向重启模块 12发送为低电平的异常信号； 重启模块 12的与门的第一 输入端 g连接判断模块 11的输出端 e, 接收到为低电平的异常信号， 与门的第 二输入端 h接入比较信号 Vc, 该比较信号 Vc始终为高电平， 即异常信号与比 较信号 Vc不相同， 所以与门的输出端 i输出低电平信号， 即重启信号， 重启所 述背光模组驱动电路， 保证了背光模组驱动电路的正常工作。
任意一个电信号在传输的途中， 都会受到电子器件本身物理特性等因素影 响， 而带上噪音， 为了降低比较信号的噪音， 如图 2所示， 所述背光模组驱动 电路还可包括电容 C1 , 电容 C1的一端连接与门的第二输入端 h , 另一端接地， 在比较信号 Vc进入与门之前为比较信号降噪， 以提高与门即重启模块 12的工 作可靠性。
另外， 本发明实施例还提供了一种显示装置， 包括上述任一种背光模组驱 动电路。 例如， 所述显示装置为液晶显示装置。
以上所述， 仅为本发明的具体实施方式， 但本发明的保护范围并不局限于 此， 任何熟悉本技术领域的技术人员在本发明披露的技术范围内， 可轻易想到 的变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保护范围 应以所述权利要求的保护范围为准。

Claims

权 利 要 求 书
1、 一种背光模组驱动电路， 包括：
判断模块， 当判断电源信号变化到预定值时， 向重启模块发送异常信号； 重启模块， 当接收到来自所述判断模块的异常信号时， 所述重启模块发出 重启信号， 重启所述背光模组驱动电路。
2、 根据权利要求 1所述的背光模组驱动电路， 其中，
所述判断模块包括三态门， 所述三态门的输入端和控制使能端连接所述判 断模块的输入端， 接入所述电源信号， 所述三态门的输出端连接到所述重启模 块的输入端。
3、 根据权利要求 1所述的背光模组驱动电路， 其中，
所述重启模块包括与门， 所述与门的第一输入端连接所述重启模块的输入 端， 所述与门的第二输入端接入比较信号， 所述与门的输出端连接所述重启模 块的输出端。
4、 根据权利要求 3所述的背光模组驱动电路， 其中，
所述比较信号为高电平信号。
5、 根据权利要求 3或 4所述的背光模组驱动电路， 还包括：
电容， 所述电容的一端连接所述与门的第二输入端， 另一端接地。
6、 如权利要求 4所述的背光模组驱动电路， 其中， 所述异常信号为低电平 信号， 所述重启信号也为低电平信号。
7、 如权利要求 5所述的背光模组驱动电路， 其中， 所述异常信号为低电平 信号， 所述重启信号也为低电平信号。
8、 一种显示装置， 包括如权利要求 1-4、 6、 7中任一项所述的背光模组驱 动电路。
9、 一种显示装置， 包括如权利要求 5所述的背光模组驱动电路。
PCT/CN2013/082080 2013-05-20 2013-08-22 背光模组驱动电路和显示装置 Ceased WO2014187039A1 (zh)

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