WO2015039359A1 - 一种用于液晶显示装置的背光模组及其控制方法 - Google Patents

一种用于液晶显示装置的背光模组及其控制方法 Download PDF

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WO2015039359A1
WO2015039359A1 PCT/CN2013/084099 CN2013084099W WO2015039359A1 WO 2015039359 A1 WO2015039359 A1 WO 2015039359A1 CN 2013084099 W CN2013084099 W CN 2013084099W WO 2015039359 A1 WO2015039359 A1 WO 2015039359A1
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light source
backlight module
light
switches
light sources
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PCT/CN2013/084099
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English (en)
French (fr)
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齐明虎
吴俊豪
林昆贤
汪永强
舒志优
杨卫兵
陈增宏
杨国坤
李晨阳子
蒋运芍
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深圳市华星光电技术有限公司
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Publication of WO2015039359A1 publication Critical patent/WO2015039359A1/zh

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/58—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving end of life detection of LEDs
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines

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  • the present invention relates to the field of backlight modules for liquid crystal display devices, and more particularly to a backlight module for improving the service life of a liquid crystal display device and a control method thereof.
  • LCD TVs have entered thousands of households, and are popular among users because of their light, thin, and colorful colors.
  • life expectancy of LCD TV screens is still an important factor in determining the quality of LCD TVs.
  • How to extend the life of LCD TV displays is a major problem for TV manufacturers today.
  • There are two main influencing factors for display life one is the aging speed of the display; the other is the life of the backlight.
  • the backlight of the existing LCD TV has a life of about 50,000 hours.
  • the television has a problem of color cast due to aging of the backlight source, thereby affecting the viewing effect, reducing the actual life of the liquid crystal display, and reducing the quality of the liquid crystal television.
  • the object of the present invention is to provide a backlight module capable of extending the service life of the liquid crystal display device and a control method thereof, in view of the shortcoming of the short life of the liquid crystal television display screen in the prior art.
  • a backlight module for a liquid crystal display device includes a light emitting unit and a power source for supplying power to the light emitting unit, the light emitting unit includes a plurality of light sources arranged in parallel, and the plurality of light sources Corresponding multiple switches, and a controller for controlling the switching of each of the switches; each of the light sources is electrically connected to the power source through a corresponding switch, and the plurality of switches are The controller is electrically connected; when the backlight module is turned on, the controller selectively turns on one of the plurality of switches to turn on a light source corresponding to the turned-on switch:
  • the plurality of light sources are sequentially numbered, and the numbers of the plurality of light sources are 1, 2, ..., respectively;
  • step S3 Check whether the i+1th light source can work normally; if the i+1th light source can work normally, step S4 is performed; if the i+1th light source is not working normally, step S5 is performed;
  • step S5 adding 1 to the value of i, and then returning to step S3 to continue execution until a light source that is working properly is detected.
  • each of the light sources includes a plurality of backlights arranged in parallel.
  • the backlight module further includes a number for recording a light source used when the backlight backlight module is turned on the previous time. Logger.
  • the backlight module further includes an electric meter for detecting a current value of each of the light sources to determine whether the detected light source can work normally.
  • the backlight module further includes an alarm device for issuing an alarm prompt when the detected light source is not working normally.
  • the method for controlling a backlight module for a liquid crystal display device comprises the following steps:
  • the backlight module comprising a plurality of light sources, a plurality of switches respectively electrically connected to the light sources, and a controller for controlling the switching of the plurality of switches;
  • the plurality of light sources are sequentially numbered, and the numbers of the plurality of light sources are 1, 2, ..., respectively;
  • step S3 Check whether the i+1th light source can work normally; if the i+1th light source can work normally, step S4 is performed; if the i+1th light source is not working normally, step S5 is performed;
  • step S5 adding 1 to the value of i, and then returning to step S3 to continue execution until a light source that is working properly is detected.
  • the step S3 includes:
  • the i+1th light source When the current value of the detected i+1th light source exceeds the current threshold, the i+1th light source can work normally; when the detected current value of the i+1th light source is less than When the current threshold is used, the i+1th light source cannot work normally.
  • the beneficial effects of implementing the invention are as follows: by setting a plurality of sets of backlight sources, and then arranging the light sources used each time by the controller, the enabled light sources are different each time the backlight module is turned on. In this way, a plurality of light sources in the backlight module are used in turn, each of which can avoid accelerated aging caused by excessive use for a long time, thereby improving the service life of the backlight module and reducing the color cast caused by the aging of the backlight module. risks of.
  • FIG. 1 is a schematic structural view of a backlight module for a liquid crystal display device according to the present invention
  • FIG. 2 is a flow chart showing the operation of a method for controlling a backlight module of a liquid crystal display device according to the present invention.
  • the backlight module of the liquid crystal display device provided by the present invention is suitable for a liquid crystal display.
  • the invention adds a plurality of light sources to the backlight source, and then adjusts the use of the light source by the controller, so that different light sources that can be called each time the backlight module is turned on can reduce the frequency of use of each light source, thereby improving the light source.
  • the service life further increases the service life of the backlight module, further improving the service life of the liquid crystal display device.
  • a backlight module provided by the present invention includes a light emitting unit 10 and a power source 20 for supplying power to the light emitting unit 10 .
  • the light emitting unit 10 includes a plurality of light sources 110 disposed in parallel, a plurality of switches 30 connected between the plurality of light sources 110 and the power source 20 for controlling the plurality of light sources 110 to be turned on and off, and electrically connected to the plurality of switches 30.
  • Connected controller 40 Connected controller 40.
  • the controller 40 is used to control the on and off of each switch 30.
  • each light source 110 is electrically connected to the power source 20 through a switch 30 corresponding thereto, and each light source 110 and its corresponding switch 30 form an independent power supply loop with the power source 20, that is, each The light sources 110 are connected in parallel with each other.
  • Each light source 110 is composed of a plurality of backlights 1111 connected in parallel with each other, and the backlights are preferably backlight LED lamps.
  • the controller 40 selectively turns on a switch 30 in accordance with a predetermined step (the step provided in the control method), thereby turning on the light source 110 corresponding to the switch 30. Only two light sources 110 are drawn in Fig. 1. It will be understood that a plurality of light sources 110 may be arranged in sequence.
  • the backlight module further includes a recorder 50 for recording the number of the light source used when the backlight backlight module is turned on for the previous time, and detecting a current value of each of the light sources 110 to determine whether the detected light source can work normally.
  • the electric meter 60 and the alarm device 70 for issuing an alarm when the detected light source is not working properly.
  • the recorder 50, the meter 60, and the alarm device 70 are all electrically connected to the controller 40, and the controller 40 controls its operation. At the same time, the recorder 50 turns on the recorded light source 110, and the meter 60 reports the detected current value of the light source 110 to the controller 40.
  • a method for controlling a backlight module provided by the present invention specifically includes the following steps:
  • the controller 40 sequentially numbers the plurality of light sources 110, and marks the light sources as 1, 2, 3, ..., respectively.
  • a plurality of switches 30 corresponding to the light source 110 are also sequentially numbered, labeled 1a, 2a, 3a....na, the number of the light source 110 and the one-to-one corresponding switch 30 are stored in the controller 40; when the backlight module is used for the first time, the controller 40 will use the number of the used light source 110 and its corresponding switch The number of 30 is recorded in the recorder 50.
  • the controller 40 reads from the recorder 50 the number i of the light source 110 used when the backlight module was last turned on, i is any one of 1 to n, and the number of the corresponding switch 30 Ia, ia is any value from 1a to na;
  • the controller 40 detects the i+1th light source 110 to determine whether it can work normally. Specifically, a current threshold is preset in the controller 40; the controller 40 controls the (i+1)th switches 30 corresponding to the i+1th light source 110 to be closed to energize the i+1th light source 110. The controller 40 issues an instruction to control the electric meter 60 to detect the current value across the i+1th light source 110 and acquire the detected current value. Comparing the obtained current value with the set current threshold, if the obtained current value is greater than the set current threshold, determining that the i+1th light source 110 can work normally, if the acquired current value is less than the set current threshold When it is determined, the i+1th light source 110 is not working normally.
  • a current threshold is preset in the controller 40; the controller 40 controls the (i+1)th switches 30 corresponding to the i+1th light source 110 to be closed to energize the i+1th light source 110.
  • the controller 40 issues an instruction to control the electric meter 60 to detect the current value across the
  • the specific current detecting circuit can be various current detecting circuits, and the current detecting method can also be an existing common current detecting method.
  • step S4 is performed; when the i+1th light source 110 is not working normally, step S5 is performed.
  • the controller 40 controls the alarm device 70 to issue an alarm prompt, so that the user can find the fault early and eliminate the fault. In other embodiments, of course, it is also possible to indicate by illumination.
  • the controller 40 controls (i+1)a switches corresponding to the i+1th light source 110 to be turned on to turn on the i+1th light source 110, and the number of the turned-on light source 110 and the number of the corresponding switch 30 thereof Recorded in the recorder 50, the recorder 50 increments the value of the recorded i by one.
  • step S5 The value of i is incremented by 1, and then the process returns to step S3 to continue detecting the remaining light source 110 until the light source 110 that can operate normally is detected.
  • the controller 40 starts detecting again from the first light source, and returns to step S3 to continue the execution.

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  • Liquid Crystal Display Device Control (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

提供了一种用于液晶显示装置的背光模组及其控制方法，其中背光模组包括发光单元（10）以及用于为发光单元（10）提供电能的电源（20），发光单元（10）包括多个并联设置的光源（110）、与多个光源（110）对应的多个开关（30）、以及用于控制每个开关（30）通断的控制器（40）；每个光源（110）均通过一个对应的开关（30）与电源（20）电性连接，多个开关（30）均与控制器（40）电性连接；开启背光模组时，控制器（40）按以下步骤选择导通多个开关（30）中的一个，以开启与导通的开关（30）对应的光源（110），读取前一次开启背光模组时所使用的光源（110）的编号i，检査第i+1个光源（110）是否能正常工作，若第i+1个光源（110）能正常工作，则启用第i+1个光源（110）并将所记录的i的值加1，若第i+1个光源（110）不能正常工作，则将i的值加1，然后返回继续执行检査，直至检测出能正常工作的光源（110），这样可以提高背光模组的使用寿命。

Description

一种用于液晶显示装置的背光模组及其控制方法 技术领域
本发明涉及一种液晶显示装置的背光模组领域，尤其涉及一种用于提高液晶显示装置使用寿命的背光模组及其控制方法。
背景技术
目前，液晶电视已进入千家万户，因其轻、薄、色彩绚丽等特点而深受用户喜爱。然而，液晶电视的显示屏的寿命依然是决定液晶电视质量的一个重要因素，如何延长液晶电视显示屏的寿命是当今电视机制造商的一大难题。显示屏寿命有两个主要的影响因素，其一是显示屏的老化速度；其二是背光灯管的寿命。现有的液晶电视的背光灯管的寿命约为5万小时。但是一般电视机在使用到6到7年后由于背光光源的老化导致出现偏色的问题，从而影响观看效果，降低了液晶显示屏的实际使用寿命，降低了液晶电视的质量。
因此，急需提供一种能延长液晶电视使用寿命的背光模组。
发明内容
本发明的目的在于，针对现有技术中液晶电视显示屏的使用寿命短的缺陷，提供一种能延长液晶显示装置的使用寿命的背光模组及其控制方法。
本发明提供的一种用于液晶显示装置的背光模组，包括发光单元以及用于为所述发光单元提供电能的电源，所述发光单元包括多个并联设置的光源、与所述多个光源对应的多个开关、以及用于控制每个所述开关通断的控制器；每个所述光源均通过一个对应的所述开关与所述电源电性连接，所述多个开关均与所述控制器电性连接；开启所述背光模组时，所述控制器按以下步骤选择导通所述多个开关中的一个，以开启与导通的所述开关对应的光源：
S1 、对所述多个光源依次进行编号，所述多个光源的编号分别为1,2…n；
S2 、读取前一次开启背光模组时所使用的光源的编号 i，其中i为1至n中的任意一个数值；
S3 、检查第i+1个光源是否能正常工作；若所述第i+1个光源能正常工作，则执行步骤S4；若所述第i+1个光源不能正常工作，则执行步骤S5；
S4 、启用所述第i+1个光源并将所记录的i的值加1；
S5 、将i的值加1，然后返回步骤S 3继续执行，直至检测出能正常工作的光源。
上述的背光模组中，所述每个光源包括多个并联设置的背光灯。
上述的背光模组中，所述背光模组还包括用于记录前一次开启背光源背光模组时所使用的光源的编号 的记录器。
上述的背光模组中，所述背光模组还包括用于检测所述每个光源的电流值以判断检测的光源是否能正常工作的电表。
上述的背光模组中，所述背光模组还包括用于在检测到的所述光源不能正常工作的情况下发出报警提示的警报装置。
本发明提供的用于液晶显示装置的背光模组的控制方法，包括以下步骤：
S1 、提供一种的液晶显示装置的背光模组，所述背光模组包括多个光源、分别与所述光源分别电连接的多个开关以及用于控制所述多个开关通断的控制器；对所述多个光源依次进行编号，所述多个光源的编号分别为1,2…n；
S2 、读取前一次开启背光模组时所使用的光源的编号i，其中i为1至n中任意一个数值；
S3 、检查第i+1个光源是否能正常工作；若所述第i+1个光源能正常工作，则执行步骤S4；若所述第i+1个光源不能正常工作，则执行步骤S5；
S4 、启用所述第i+1个光源并将所记录的i值加1；
S5 、将i的值加1，然后返回步骤S 3继续执行，直至检测出能正常工作的光源。
上述的控制方法中，所述步骤S3包括：
预先设置电流阈值；
检测所述第i+1个光源的电流值；
当所述检测到的第i+1个光源的电流值超过所述电流阈值时，所述第i+1个光源可以正常工作；当所述检测到的第i+1个光源的电流值小于所述电流阈值时，所述第i+1个光源则不能正常工作。
上述的控制方法中，当检测的所述光源不能正常工作时，发出报警提示。
上述的控制方法中，当i的值为n时，返回检测第1个光源是否正常工作。
实施本发明的有益效果在于：通过设置多组背光光源，然后通过控制器对每次使用的光源进行调配，使每次开启背光模组时，启用的光源均不相同。这样，背光模组中的多个光源轮流使用，每个光源都可以避免因长时间过度使用而导致的加速老化，从而提高背光模组的使用寿命，降低因背光模组老化而导致的偏色的风险。
附图说明
下面将结合附图及实施例对本发明作进一步说明，附图中：
图1为本发明提供的用于液晶显示装置的背光模组的结构示意图；
图2为本发明提供的用于液晶显示装置的背光模组的控制方法的工作流程图。
具体实施方式
本发明提供的液晶显示装置的背光模组适用于液晶显示器。本发明通过对背光光源增加多个光源，然后通过控制器对光源的使用进行调配，从而使得每次开启背光模组时可以调用的不同的光源以降低每个光源的使用频率，从而提高光源的使用寿命，进而使得背光模组的使用寿命提高，进一步提高了液晶显示装置的使用寿命。
参考图1，本发明提供的背光模组包括发光单元10、为发光单元10提供电能的电源20。所述发光单元10包括多个并联设置的光源110、连接在多个光源110和电源20之间用于控制多个光源110开启和关闭的多个开关30以及与所述多个开关30电性连接的控制器40。控制器40用于控制每个开关30的通断。在本实施例中，每个光源110都通过与其对应的开关30与电源20电性连接，且每个光源110及其对应的开关30都与电源20形成独立的供电回路，也就是说，各个光源110彼此之间是并联的。每个光源110由多个相互并联的背光灯1111组成，该背光灯较佳为背光LED灯。开启背光模组时，控制器40按预定的步骤（控制方法中提供的步骤）选择导通一个开关30，从而开启与该开关30对应的光源110。图1中只绘制了2个光源110，可以理解的是，也可以依次设置多个光源110。
该背光模组还包括用于记录前一次开启背光源背光模组时所使用的光源的编号的记录器50、用于检测所述每个光源110的电流值以判断检测的光源是否能正常工作的电表60以及用于在所述检测的光源不能正常工作的情况下发出报警提示的警报装置70。记录器50、电表60以及警报装置70均与控制器40电性连接，由控制器40控制其工作。同时，记录器50将其记录的光源110开启记录、电表60将检测到的光源110的电流值上报至控制器40。
参考图2，本发明提供的背光模组的控制方法，具体包括以下步骤：
S1 、控制器40对多个光源110依次进行编号，并将光源分别标记为1、2、3…n，同时将多个与光源110一一对应的开关30也依次编号，标记为1a,2a,3a….na，将光源110以及与其一一对应的开关30的编号均存储在控制器40中；在首次使用背光模组时，控制器40将使用过的光源110的编号以及其对应的开关30的编号记录在记录器50中。
S2 、开启背光模组时，控制器40从记录器50中读取上一次背光模组开启时使用的光源110的编号i，i为1至n中任意一个数值，以及其对应的开关30的编号ia，ia为1a至na中任意一个数值；
S3 、控制器40对第i+1个光源110进行检测，判断其是否能正常工作。具体地，在控制器40中预先设定一个电流阈值；控制器40控制第i+1个光源110对应的第（i+1）a个开关30闭合从而使第i+1个光源110通电。控制器40发出指令，控制电表60对第i+1个光源110两端的电流值进行检测，并获取检测到的电流值。将获取的电流值与设定的电流阈值进行比较，若获取的电流值大于设定的电流阈值，则确定第i+1个光源110能正常工作，若获取的电流值小于设定的电流阈值时，则判定第i+1个光源110不能正常工作。具体的电流检测电路可以为现有的各种电流检测电路，电流检测方法也可以为现有的常用的电流检测方法。当第i+1个光源110能正常工作时，执行步骤S4；当第i+1个光源110不能正常工作时，则执行步骤S5。当第i+1个光源110不能正常工作时，控制器40控制警报装置70发出报警提示，便于用户及早发现该故障并排除该故障。在其他的实施例中，当然也可以是通过发光提示。
S4 、控制器40控制第i+1个光源110对应的（i+1）a个开关导通从而开启第i+1个光源110，同时将开启的光源110的编号以及其对应的开关30的编号记录在记录器50中，即记录器50将记录的i值加1。
S5 、将i的值加1，然后返回步骤S3，继续检测剩下的光源110，直到检测出能正常工作的光源110为止。当检测的光源110为最后一个时即i=n时，则控制器40又开始从第1个光源开始检测，并返回步骤S3，继续执行。
应当理解的是，对本领域普通技术人员来说，可以根据上述说明加以改进或变换，而所有这些改进和变换都应属于本发明所附权利要求的保护范围。

Claims (9)

  1. 一种用于液晶显示装置的背光模组，包括发光单元以及用于为所述发光单元提供电能的电源，其中，所述发光单元包括多个并联设置的光源、与所述多个光源对应的多个开关、以及用于控制每个所述开关通断的控制器；每个所述光源均通过一个对应的所述开关与所述电源电性连接，所述多个开关均与所述控制器电性连接；开启所述背光模组时，所述控制器按以下步骤选择导通所述多个开关中的一个，以开启与导通的所述开关对应的光源：
    S1 、对所述多个光源依次进行编号，所述多个光源的编号分别为1,2…n；
    S2 、读取前一次开启背光模组时所使用的光源的编号 i，其中i为1至n中的任意一个数值；
    S3 、检查第i+1个光源是否能正常工作；若所述第i+1个光源能正常工作，则执行步骤S4；若所述第i+1个光源不能正常工作，则执行步骤S5；
    S4 、启用所述第i+1个光源并将所记录的i的值加1；
    S5 、将i的值加1，然后返回步骤S3继续执行，直至检测出能正常工作的光源。
  2. 根据权利要求1所述的背光模组，其中，所述每个光源包括多个并联设置的背光灯。
  3. 根据权利要求1所述的背光模组，其中，所述背光模组还包括用于记录前一次开启背光模组时所使用的光源的编号的记录器。
  4. 根据权利要求1所述的背光模组，其中，所述背光模组还包括用于检测所述每个光源的电流值以判断所述检测的光源是否能正常工作的电表。
  5. 根据权利要求1所述的背光模组，其中，所述背光模组还包括用于在所述检测的光源不能正常工作的情况下发出报警提示的警报装置。
  6. 一种用于液晶显示装置的背光模组的控制方法，其中，包括以下步骤：
    S1 、提供一种用于液晶显示装置的背光模组，所述背光模组包括多个光源、分别与所述光源电连接的多个开关以及用于控制所述每个开关通断的控制器；对所述多个光源依次进行编号，所述多个光源的编号分别为1,2…n；
    S2 、读取前一次开启背光模组时所使用的光源的编号i，其中i为1至n中任意一个数值；
    S3 、检查第i+1个光源是否能正常工作；若所述第i+1个光源能正常工作，则执行步骤S4；若所述第i+1个光源不能正常工作，则执行步骤S5；
    S4 、启用所述第i+1个光源并将所记录的i的值加1；
    S5 、将i的值加1，然后返回步骤S3继续执行，直至检测出能正常工作的光源。
  7. 根据权利要求6所述的控制方法，其中，所述步骤S3包括：
    预先设置电流阈值；
    检测所述第i+1个光源的电流值；
    当所述检测到的第i+1个光源的电流值超过所述电流阈值时，所述第i+1个光源可以正常工作；当所述检测到的第i+1个光源的电流值小于所述电流阈值时，所述第i+1个光源则不能正常工作。
  8. 根据权利要求6所述的控制方法，其中，当所述检测的光源不能正常工作时，发出报警提示。
  9. 根据权利要求6所述的控制方法，其中，当i的值为n时，返回检测第1个光源是否正常工作。
PCT/CN2013/084099 2013-09-18 2013-09-24 一种用于液晶显示装置的背光模组及其控制方法 WO2015039359A1 (zh)

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