CN106960660B - A kind of liquid crystal display device and backlight lamp control method - Google Patents
A kind of liquid crystal display device and backlight lamp control method Download PDFInfo
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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
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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Abstract
本发明提供一种液晶显示装置及背光灯控制方法。液晶显示装置背光模组中的LED模块包括恒流单元、LED单元、控制单元、光强检测单元，其中LED单元包括主LED单元和副LED单元，恒流单元包括第一恒流单元和第二恒流单元，第一恒流单元与主LED单元连接，向主LED单元提供发光所需电流，第二恒流单元与副LED单元连接，向副LED单元提供发光所需电流，通过增加驱动电流的方式以及切换主、副LED的方式来提高LED的亮度，确保LED光源亮度，即使使用一段时候后，用户也能看到正常的画面。
The invention provides a liquid crystal display device and a backlight control method. The LED module in the backlight module of the liquid crystal display device includes a constant current unit, an LED unit, a control unit, and a light intensity detection unit, wherein the LED unit includes a main LED unit and a secondary LED unit, and the constant current unit includes a first constant current unit and a second constant current unit. The constant current unit, the first constant current unit is connected with the main LED unit to provide the current required for light emission to the main LED unit, and the second constant current unit is connected to the auxiliary LED unit to provide the current required for light emission to the auxiliary LED unit. By increasing the driving current The method of switching the main and auxiliary LEDs can improve the brightness of the LEDs and ensure the brightness of the LED light source. Even after using it for a period of time, the user can still see the normal picture.
Description
技术领域technical field
本发明涉及电子显示技术领域，特别是涉及一种液晶显示装置及背光灯控制方法。The invention relates to the technical field of electronic display, in particular to a liquid crystal display device and a backlight control method.
背景技术Background technique
随着产业日益发达，移动电话(mobilePhone)、数码相机(digitalcamera)、数码摄像机(digitalvideocamera)、笔记本电脑(notebook)、桌面计算机、电视机等无不朝向更便利、多功能且美观的方向发展。然而，移动电话、数码相机、数码摄像机、笔记本电脑、桌面计算机和电视机的显示屏幕是不可或缺的人机沟通界面，透过上述产品的显示屏幕将可以为使用者的操作带来更多的便利。近年来，大部分的移动电话、数码相机、数码摄像机、笔记本电脑以及桌面计算机和电视机上的显示屏幕都以液晶显示器面板为主流。With the development of the industry, mobile phones, digital cameras, digital video cameras, notebook computers, desktop computers, televisions, etc. are all developing in a more convenient, multi-functional and beautiful direction. However, the display screens of mobile phones, digital cameras, digital video cameras, notebook computers, desktop computers and televisions are indispensable human-machine communication interfaces. The display screens of the above products will bring more convenience. In recent years, most of the display screens on mobile phones, digital cameras, digital video cameras, notebook computers, desktop computers and televisions have been dominated by liquid crystal display panels.
由于液晶显示器面板中的液晶本身不发光，因而，为达到显示效果，须给液晶显示器面板提供一面光源装置，如背光模组，以实现显示功能。现有技术背光模组包括光源、导光板及框架，光源是相对导光板的入光面设置，导光板引导光源发出光线的传输方向，将线光源或点光源转发出的光线化为均匀的平面光出射以照亮液晶显示器中的液晶显示面板。框架用于固定该背光模组的各组件。Since the liquid crystal in the liquid crystal display panel does not emit light itself, in order to achieve the display effect, it is necessary to provide the liquid crystal display panel with a light source device, such as a backlight module, to realize the display function. The prior art backlight module includes a light source, a light guide plate, and a frame. The light source is set relative to the light incident surface of the light guide plate. The light guide plate guides the transmission direction of the light emitted by the light source, and converts the light emitted by the line light source or point light source into a uniform plane. The light is emitted to illuminate the liquid crystal display panel in the liquid crystal display. The frame is used to fix the various components of the backlight module.
图1所示为现有技术的液晶显示器结构示意图。如图1所示，该液晶显示器1包括一液晶面板11、一背光模组12及一外框13，该外框13收容并固定液晶面板11及背光模组12。该背光模组12包括一胶框121、一反射片122、一导光板123、多个发光二极管光源124、一软性电路板125、一扩散片126、两增光片127及一遮光带128。该发光二极管光源124和该软性电路板125连接，该软性电路板125向该发光二极管光源124提供发光所需电流，该发光二极管光源124位于该导光板123的入光面附近，使该发光二极管光源124所发出光线经该导光板123的入光面进入该导光板123内部。该导光板123内部的光线经底面网点的散射及置于该导光板123底面的反射片122反射，由该导光板123的出光面均匀射出。该扩散片126及两增光片127依次放置在该导光板123的出光面，通过扩散及聚光作用，以改善输出光线的品质，进而提供液晶面板11显示用的面光源。该遮光带128位于液晶面板11和增光片127之间，防止漏光。该胶框121和该外框13相互卡扣配合，以此固定背光模组12的各组件。FIG. 1 is a schematic structural diagram of a liquid crystal display in the prior art. As shown in FIG. 1 , the liquid crystal display 1 includes a liquid crystal panel 11 , a backlight module 12 and a frame 13 , and the frame 13 accommodates and fixes the liquid crystal panel 11 and the backlight module 12 . The backlight module 12 includes a plastic frame 121 , a reflection sheet 122 , a light guide plate 123 , a plurality of LED light sources 124 , a flexible circuit board 125 , a diffusion sheet 126 , two brightness enhancement sheets 127 and a light shielding strip 128 . The LED light source 124 is connected to the flexible circuit board 125, and the flexible circuit board 125 provides the LED light source 124 with the required current for lighting. The LED light source 124 is located near the light incident surface of the light guide plate 123, so that the The light emitted by the LED light source 124 enters the interior of the light guide plate 123 through the light incident surface of the light guide plate 123 . The light inside the light guide plate 123 is scattered by the dots on the bottom surface and reflected by the reflective sheet 122 placed on the bottom surface of the light guide plate 123 , and is uniformly emitted from the light emitting surface of the light guide plate 123 . The diffusion sheet 126 and the two light enhancement sheets 127 are sequentially placed on the light emitting surface of the light guide plate 123 to improve the quality of the output light through diffusion and light concentrating, and further provide a surface light source for the display of the liquid crystal panel 11 . The light-shielding strip 128 is located between the liquid crystal panel 11 and the brightness enhancement sheet 127 to prevent light leakage. The plastic frame 121 and the outer frame 13 are snap-fitted with each other to fix the components of the backlight module 12 .
现有LED背光液晶面板使用寿命大概为30000小时左右，其测试基准为LED灯的亮度降到初始亮度一半的时间。到达使用寿命后LED光源亮度降低，使用户看到的画面发暗，无法达到正常观看的效果，其中液晶面板部分仍工作正常。而LED灯为一次性组装，一旦打开会造成灰尘进入液晶面板，导致液晶面板的驱动电路短路造成坏点，所以现有液晶面板组装后不能再打开。这样仅因为LED灯的亮度降低就必须更换整个LED背光液晶面板，甚至因为后期厂家停产导致无相应面板可换。这样造成非常大的浪费，并给用户造成较大损失。The service life of the existing LED-backlit liquid crystal panel is about 30,000 hours, and the test benchmark is the time when the brightness of the LED light drops to half of the initial brightness. After the service life is reached, the brightness of the LED light source decreases, making the picture seen by the user dim, and the normal viewing effect cannot be achieved, and the LCD panel still works normally. The LED lights are assembled in one go. Once opened, dust will enter the LCD panel, resulting in a short circuit in the drive circuit of the LCD panel and causing dead pixels. Therefore, the existing LCD panel cannot be opened after assembly. In this way, the entire LED-backlit liquid crystal panel must be replaced only because the brightness of the LED lamp is reduced, and even there is no corresponding panel to replace because the manufacturer stopped production in the later period. Cause very big waste like this, and cause greater loss to the user.
发明内容Contents of the invention
本发明的目的是针对现有技术中存在的技术缺陷，而提供一种长寿命的电子显示装置。The purpose of the present invention is to provide a long-life electronic display device for the technical defects in the prior art.
按照本发明的一个方面，提供一种液晶显示器，包括一液晶面板、一背光模组及一外框，该外框收容并固定液晶面板及背光模组，该背光模组包括一胶框、一反射片、一LED模块、一导光板、一扩散片、两增光片及一遮光带，该导光板内部的光线经底面网点的散射及置于该导光板底面的反射片反射，由该导光板的出光面均匀射出，所述LED模块包括恒流单元、LED单元、控制单元、光强检测单元，其中LED单元包括主LED单元和副LED单元，恒流单元包括第一恒流单元和第二恒流单元，第一恒流单元与主LED单元连接，向主LED单元提供发光所需电流，第二恒流单元与副LED单元连接，向副LED单元提供发光所需电流，主LED单元、副LED单元均位于该导光板的入光面附近，使该主LED单元、副LED单元所发出光线经导光板的入光面进入该导光板内部，光强检测单元用于检测主LED单元、副LED单元所发出光线强度，并将检测结果传递给控制单元，控制单元分别与第一恒流单元、第二恒流单元连接，其根据光强检测单元的检测结果控制第一恒流单元、第二恒流单元分别向主LED单元、副LED单元提供的电流大小，其中主LED单元、副LED单元分别位于导光板的两边侧，光强检测单元位于导光板的中间部位。According to one aspect of the present invention, a liquid crystal display is provided, including a liquid crystal panel, a backlight module and an outer frame, the outer frame accommodates and fixes the liquid crystal panel and the backlight module, and the backlight module includes a plastic frame, a A reflective sheet, an LED module, a light guide plate, a diffusion sheet, two light-enhancing sheets, and a light-shielding strip. The light inside the light guide plate is scattered by the dots on the bottom surface and reflected by the reflective sheet placed on the bottom surface of the light guide plate. The light emitting surface of the LED module is uniformly emitted, and the LED module includes a constant current unit, an LED unit, a control unit, and a light intensity detection unit, wherein the LED unit includes a main LED unit and a secondary LED unit, and the constant current unit includes a first constant current unit and a second constant current unit. The constant current unit, the first constant current unit is connected with the main LED unit, and provides the current required for lighting to the main LED unit, and the second constant current unit is connected with the auxiliary LED unit, and provides the current required for lighting to the auxiliary LED unit, the main LED unit, The secondary LED units are all located near the light incident surface of the light guide plate, so that the light emitted by the main LED unit and the secondary LED unit enters the interior of the light guide plate through the light incident surface of the light guide plate, and the light intensity detection unit is used to detect the main LED unit, The intensity of light emitted by the secondary LED unit, and the detection result is transmitted to the control unit, and the control unit is respectively connected with the first constant current unit and the second constant current unit, which controls the first constant current unit, the second constant current unit according to the detection result of the light intensity detection unit The second constant current unit supplies current to the main LED unit and the auxiliary LED unit respectively, wherein the main LED unit and the auxiliary LED unit are respectively located on both sides of the light guide plate, and the light intensity detection unit is located in the middle of the light guide plate.
进一步的，第一恒流单元、第二恒流单元、控制单元均设置在软性电路板上。Further, the first constant current unit, the second constant current unit and the control unit are all arranged on the flexible circuit board.
进一步的，控制单元分三种阶段对恒流单元进行控制，其中在第一阶段，控制恒流单元仅向主LED单元提供电流，在第二阶段，控制恒流单元仅向副LED单元提供电流，在第三阶段，控制恒流单元向主LED单元和副LED单元都提供电流。Further, the control unit controls the constant current unit in three stages, wherein in the first stage, the control constant current unit only provides current to the main LED unit, and in the second stage, the control constant current unit only provides current to the auxiliary LED unit , in the third stage, control the constant current unit to supply current to both the main LED unit and the auxiliary LED unit.
进一步的，在第一阶段，控制单元控制第一恒流单元向主LED单元提供恒定电流，光强检测单元检测主LED单元发出的光线强度，并将检测结果传递给控制单元，控制单元根据光强检测单元的检测结果来控制第一恒流单元提高向主LED单元供给的电流，通过增加流经主LED的电流的方式使得主LED单元发出的光线强度达到初始亮度值，当电流值提高至主LED可承受最大电流值时，控制单元切换至第二阶段。Further, in the first stage, the control unit controls the first constant current unit to provide a constant current to the main LED unit, the light intensity detection unit detects the light intensity emitted by the main LED unit, and transmits the detection result to the control unit, and the control unit according to the light intensity The detection result of the strong detection unit controls the first constant current unit to increase the current supplied to the main LED unit. By increasing the current flowing through the main LED, the light intensity emitted by the main LED unit reaches the initial brightness value. When the current value increases to When the main LED can withstand the maximum current value, the control unit switches to the second stage.
进一步的，当电流值提高至主LED可承受最大电流值的85％时，控制单元切换至第二阶段。Further, when the current value increases to 85% of the maximum current value that the main LED can withstand, the control unit switches to the second stage.
进一步的，在第二阶段，控制单元控制第二恒流单元向副LED单元提供恒定电流，光强检测单元检测副LED单元发出的光线强度，并将检测结果传递给控制单元，控制单元根据光强检测单元的检测结果来控制第二恒流单元提高向副LED单元供给的电流，通过增加流经副LED的电流的方式使得副LED单元发出的光线强度达到初始亮度值，当电流值提高至副LED可承受最大电流值时，控制单元切换至第三阶段。Further, in the second stage, the control unit controls the second constant current unit to provide a constant current to the auxiliary LED unit, the light intensity detection unit detects the light intensity emitted by the auxiliary LED unit, and transmits the detection result to the control unit, and the control unit according to the light intensity The detection result of the strong detection unit controls the second constant current unit to increase the current supplied to the sub-LED unit. By increasing the current flowing through the sub-LED, the light intensity emitted by the sub-LED unit reaches the initial brightness value. When the current value increases to When the secondary LED can withstand the maximum current value, the control unit switches to the third stage.
进一步的，当电流值提高至副LED可承受最大电流值的85％时，控制单元切换至第三阶段。Further, when the current value increases to 85% of the maximum current value that the auxiliary LED can withstand, the control unit switches to the third stage.
进一步的，在第三阶段，光强检测单元检测副LED单元在额定功率下发出的光线强度，并将检测结果传递给控制单元，若检测结果高于副LED单元的初始亮度值的60％时，则控制单元控制第二恒流单元向副LED单元提供副LED可承受最大电流值的85％，并控制第一恒流单元向主LED单元提供补偿电流，以使得主LED单元及副LED单元共同发出的光线强度达到初始亮度值；若检测结果低于副LED单元的初始亮度值的60％时，则控制单元控制第一恒流单元向主LED单元提供主LED可承受最大电流值的85％，并控制第二恒流单元向副LED单元提供补偿电流，以使得主LED单元及副LED单元共同发出的光线强度达到初始亮度值。Further, in the third stage, the light intensity detection unit detects the light intensity emitted by the auxiliary LED unit at rated power, and transmits the detection result to the control unit, if the detection result is higher than 60% of the initial brightness value of the auxiliary LED unit , the control unit controls the second constant current unit to provide 85% of the maximum current value that the sub LED can withstand to the sub LED unit, and controls the first constant current unit to provide compensation current to the main LED unit, so that the main LED unit and the sub LED unit The light intensity emitted together reaches the initial brightness value; if the detection result is lower than 60% of the initial brightness value of the auxiliary LED unit, the control unit controls the first constant current unit to provide the main LED unit with 85% of the maximum current value that the main LED can withstand. %, and control the second constant current unit to provide compensation current to the auxiliary LED unit, so that the intensity of light emitted by the main LED unit and the auxiliary LED unit reaches the initial brightness value.
进一步的，主LED单元与副LED单元为相同的LED单元。Further, the main LED unit and the auxiliary LED unit are the same LED unit.
按照本发明的另一个方面，提供一种液晶显示装置中背光灯控制方法，包括：According to another aspect of the present invention, a method for controlling a backlight in a liquid crystal display device is provided, comprising:
SS1：控制单元控制第一恒流单元向主LED单元提供恒定电流，光强检测单元检测主LED单元发出的光线强度，并将检测结果传递给控制单元，控制单元根据光强检测单元的检测结果来控制第一恒流单元提高向主LED单元供给的电流，通过增加流经主LED的电流的方式使得主LED单元发出的光线强度达到初始亮度值，当电流值提高至主LED可承受最大电流值时，控制单元切换至SS2。SS1: The control unit controls the first constant current unit to provide constant current to the main LED unit, the light intensity detection unit detects the light intensity emitted by the main LED unit, and transmits the detection result to the control unit, and the control unit according to the detection result of the light intensity detection unit To control the first constant current unit to increase the current supplied to the main LED unit. By increasing the current flowing through the main LED, the light intensity emitted by the main LED unit reaches the initial brightness value. When the current value increases to the maximum current that the main LED can withstand value, the control unit switches to SS2.
SS2：控制单元控制第二恒流单元向副LED单元提供恒定电流，光强检测单元检测副LED单元发出的光线强度，并将检测结果传递给控制单元，控制单元根据光强检测单元的检测结果来控制第二恒流单元提高向副LED单元供给的电流，通过增加流经副LED的电流的方式使得副LED单元发出的光线强度达到初始亮度值，当电流值提高至副LED可承受最大电流值时，控制单元切换至SS3。SS2: The control unit controls the second constant current unit to provide constant current to the auxiliary LED unit, the light intensity detection unit detects the light intensity emitted by the auxiliary LED unit, and transmits the detection result to the control unit, and the control unit uses the detection result of the light intensity detection unit To control the second constant current unit to increase the current supplied to the sub-LED unit, by increasing the current flowing through the sub-LED, the light intensity emitted by the sub-LED unit reaches the initial brightness value, when the current value increases to the maximum current that the sub-LED can withstand value, the control unit switches to SS3.
SS3：光强检测单元检测副LED单元在额定功率下发出的光线强度，并将检测结果传递给控制单元，若检测结果高于副LED单元的初始亮度值的60％时，则控制单元控制第二恒流单元向副LED单元提供副LED可承受最大电流值的85％，并控制第一恒流单元向主LED单元提供补偿电流，以使得主LED单元及副LED单元共同发出的光线强度达到初始亮度值；若检测结果低于副LED单元的初始亮度值的60％时，则控制单元控制第一恒流单元向主LED单元提供主LED可承受最大电流值的85％，并控制第二恒流单元向副LED单元提供补偿电流，以使得主LED单元及副LED单元共同发出的光线强度达到初始亮度值。SS3: The light intensity detection unit detects the light intensity emitted by the auxiliary LED unit at rated power, and transmits the detection result to the control unit. If the detection result is higher than 60% of the initial brightness value of the auxiliary LED unit, the control unit controls the first The second constant current unit provides 85% of the maximum current value that the auxiliary LED can withstand to the auxiliary LED unit, and controls the first constant current unit to provide compensation current to the main LED unit, so that the light intensity jointly emitted by the main LED unit and the auxiliary LED unit reaches Initial brightness value; if the detection result is lower than 60% of the initial brightness value of the auxiliary LED unit, the control unit controls the first constant current unit to provide 85% of the maximum current value that the main LED can withstand to the main LED unit, and controls the second The constant current unit provides compensation current to the auxiliary LED unit, so that the intensity of light emitted by the main LED unit and the auxiliary LED unit reaches an initial brightness value.
通过增加驱动电流的方式以及切换主、副LED的方式来提高LED的亮度，确保LED光源亮度，即使使用一段时候后，用户也能看到正常的画面。By increasing the driving current and switching between the main and auxiliary LEDs, the brightness of the LEDs can be increased to ensure the brightness of the LED light source. Even after a period of use, the user can still see a normal picture.
附图说明Description of drawings
图1所示为现有技术的液晶显示器结构示意图；FIG. 1 is a schematic structural view of a liquid crystal display in the prior art;
图2示出本发明LED模块的电性连接图。Fig. 2 shows the electrical connection diagram of the LED module of the present invention.
图3示出本发明LED模块结构示意图。Fig. 3 shows a schematic structural diagram of the LED module of the present invention.
具体实施方式Detailed ways
本发明的实施方式提供了一种液晶显示装置及背光灯控制方法，通过增加驱动电流的方式以及切换主、副LED的方式来提高LED的亮度，确保LED光源亮度，即使使用一段时候后，用户也能看到正常的画面。Embodiments of the present invention provide a liquid crystal display device and a backlight control method. The brightness of the LED is increased by increasing the driving current and switching the main and auxiliary LEDs to ensure the brightness of the LED light source. Even after a period of use, the user You can also see the normal screen.
下面结合附图对本发明的实施方式提供的技术方案进行说明。The technical solutions provided by the embodiments of the present invention will be described below with reference to the accompanying drawings.
液晶显示器包括一液晶面板、一背光模组及一外框，该外框收容并固定液晶面板及背光模组。该背光模组包括一胶框、一反射片、一LED模块、一导光板、一扩散片、两增光片及一遮光带，该导光板内部的光线经底面网点的散射及置于该导光板底面的反射片反射，由该导光板的出光面均匀射出。The liquid crystal display includes a liquid crystal panel, a backlight module and an outer frame, and the outer frame accommodates and fixes the liquid crystal panel and the backlight module. The backlight module includes a plastic frame, a reflection sheet, an LED module, a light guide plate, a diffusion sheet, two light-enhancing sheets and a light-shielding tape. Reflected by the reflective sheet on the bottom surface, it is evenly emitted from the light-emitting surface of the light guide plate.
图2示出本发明LED模块的电性连接图。Fig. 2 shows the electrical connection diagram of the LED module of the present invention.
如图2所示，LED模块包括恒流单元、LED单元、控制单元、光强检测单元，其中LED单元包括主LED单元和副LED单元，恒流单元包括第一恒流单元和第二恒流单元，第一恒流单元与主LED单元连接，向主LED单元提供发光所需电流，第二恒流单元与副LED单元连接，向副LED单元提供发光所需电流，主LED单元、副LED单元均位于该导光板的入光面附近，使该主LED单元、副LED单元所发出光线经导光板的入光面进入该导光板内部，光强检测单元用于检测主LED单元、副LED单元所发出光线强度，并将检测结果传递给控制单元，控制单元分别与第一恒流单元、第二恒流单元连接，其根据光强检测单元的检测结果控制第一恒流单元、第二恒流单元分别向主LED单元、副LED单元提供的电流大小。As shown in Figure 2, the LED module includes a constant current unit, an LED unit, a control unit, and a light intensity detection unit, wherein the LED unit includes a main LED unit and a secondary LED unit, and the constant current unit includes a first constant current unit and a second constant current unit. unit, the first constant current unit is connected with the main LED unit, and provides the current required for light emission to the main LED unit, and the second constant current unit is connected with the auxiliary LED unit, and provides the current required for light emission to the auxiliary LED unit, the main LED unit, the auxiliary LED The units are located near the light incident surface of the light guide plate, so that the light emitted by the main LED unit and the auxiliary LED unit enters the interior of the light guide plate through the light incident surface of the light guide plate, and the light intensity detection unit is used to detect the light intensity of the main LED unit and the auxiliary LED unit. The intensity of the light emitted by the unit, and the detection result is transmitted to the control unit, and the control unit is respectively connected with the first constant current unit and the second constant current unit, which controls the first constant current unit and the second constant current unit according to the detection result of the light intensity detection unit. The magnitude of the current provided by the constant current unit to the main LED unit and the auxiliary LED unit respectively.
图3示出本发明LED模块结构示意图。Fig. 3 shows a schematic structural diagram of the LED module of the present invention.
如图3所示，主LED单元、副LED单元分别位于导光板的两边侧，光强检测单元位于导光板的中间部位。As shown in FIG. 3 , the main LED unit and the auxiliary LED unit are respectively located on both sides of the light guide plate, and the light intensity detection unit is located in the middle of the light guide plate.
根据本发明的一实施例，第一恒流单元、第二恒流单元、控制单元均设置在软性电路板上。According to an embodiment of the present invention, the first constant current unit, the second constant current unit and the control unit are all arranged on the flexible circuit board.
根据本发明的一实施例，控制单元分三种阶段对恒流单元进行控制，其中在第一阶段，控制恒流单元仅向主LED单元提供电流，在第二阶段，控制恒流单元仅向副LED单元提供电流，在第三阶段，控制恒流单元向主LED单元和副LED单元都提供电流。According to an embodiment of the present invention, the control unit controls the constant current unit in three stages, wherein in the first stage, the control constant current unit only supplies current to the main LED unit, and in the second stage, the control constant current unit only supplies current to the main LED unit. The auxiliary LED unit supplies current, and in the third stage, the control constant current unit supplies current to both the main LED unit and the auxiliary LED unit.
根据本发明的一实施例，在第一阶段，控制单元控制第一恒流单元向主LED单元提供恒定电流，光强检测单元检测主LED单元发出的光线强度，并将检测结果传递给控制单元，控制单元根据光强检测单元的检测结果来控制第一恒流单元提高向主LED单元供给的电流，通过增加流经主LED的电流的方式使得主LED单元发出的光线强度达到初始亮度值，当电流值提高至主LED可承受最大电流值时，控制单元切换至第二阶段。According to an embodiment of the present invention, in the first stage, the control unit controls the first constant current unit to provide a constant current to the main LED unit, and the light intensity detection unit detects the light intensity emitted by the main LED unit, and transmits the detection result to the control unit , the control unit controls the first constant current unit to increase the current supplied to the main LED unit according to the detection result of the light intensity detection unit, and makes the light intensity emitted by the main LED unit reach the initial brightness value by increasing the current flowing through the main LED, When the current value increases to the maximum current value that the main LED can withstand, the control unit switches to the second stage.
优选的，当电流值提高至主LED可承受最大电流值的85％时，控制单元切换至第二阶段。这样可以避免主LED单元长时间工作于LED极限电流状态，提高主LED单元的寿命。Preferably, when the current value increases to 85% of the maximum current value that the main LED can withstand, the control unit switches to the second stage. In this way, the main LED unit can be prevented from working in the LED limit current state for a long time, and the service life of the main LED unit can be improved.
根据本发明的一实施例，在第二阶段，控制单元控制第二恒流单元向副LED单元提供恒定电流，光强检测单元检测副LED单元发出的光线强度，并将检测结果传递给控制单元，控制单元根据光强检测单元的检测结果来控制第二恒流单元提高向副LED单元供给的电流，通过增加流经副LED的电流的方式使得副LED单元发出的光线强度达到初始亮度值，当电流值提高至副LED可承受最大电流值时，控制单元切换至第三阶段。According to an embodiment of the present invention, in the second stage, the control unit controls the second constant current unit to provide a constant current to the auxiliary LED unit, and the light intensity detection unit detects the light intensity emitted by the auxiliary LED unit, and transmits the detection result to the control unit , the control unit controls the second constant current unit to increase the current supplied to the sub-LED unit according to the detection result of the light intensity detection unit, and makes the light intensity emitted by the sub-LED unit reach the initial brightness value by increasing the current flowing through the sub-LED, When the current value increases to the maximum current value that the secondary LED can withstand, the control unit switches to the third stage.
优选的，当电流值提高至副LED可承受最大电流值的85％时，控制单元切换至第三阶段。这样可以避免副LED单元长时间工作于LED极限电流状态，提高副LED单元的寿命。Preferably, when the current value increases to 85% of the maximum current value that the auxiliary LED can withstand, the control unit switches to the third stage. In this way, the auxiliary LED unit can be prevented from working in the LED limit current state for a long time, and the service life of the auxiliary LED unit can be improved.
根据本发明的一实施例，在第三阶段，光强检测单元检测副LED单元在额定功率下发出的光线强度，并将检测结果传递给控制单元，若检测结果高于副LED单元的初始亮度值的60％时，则控制单元控制第二恒流单元向副LED单元提供副LED可承受最大电流值的85％，并控制第一恒流单元向主LED单元提供补偿电流，以使得主LED单元及副LED单元共同发出的光线强度达到初始亮度值；若检测结果低于副LED单元的初始亮度值的60％时，则控制单元控制第一恒流单元向主LED单元提供主LED可承受最大电流值的85％，并控制第二恒流单元向副LED单元提供补偿电流，以使得主LED单元及副LED单元共同发出的光线强度达到初始亮度值。According to an embodiment of the present invention, in the third stage, the light intensity detection unit detects the light intensity emitted by the auxiliary LED unit at rated power, and transmits the detection result to the control unit, if the detection result is higher than the initial brightness of the auxiliary LED unit When the value is 60%, the control unit controls the second constant current unit to provide 85% of the maximum current value that the auxiliary LED can withstand to the auxiliary LED unit, and controls the first constant current unit to provide compensation current to the main LED unit, so that the main LED The light intensity jointly emitted by the unit and the auxiliary LED unit reaches the initial brightness value; if the detection result is lower than 60% of the initial brightness value of the auxiliary LED unit, the control unit controls the first constant current unit to provide the main LED unit with the main LED. 85% of the maximum current value, and control the second constant current unit to provide compensation current to the auxiliary LED unit, so that the light intensity jointly emitted by the main LED unit and the auxiliary LED unit reaches the initial brightness value.
根据本发明的一实施例，主LED单元与副LED单元为相同的LED单元。According to an embodiment of the present invention, the main LED unit and the auxiliary LED unit are the same LED unit.
此外本发明提供一种液晶显示装置中背光灯控制方法，包括：In addition, the present invention provides a method for controlling a backlight in a liquid crystal display device, comprising:
SS1：控制单元控制第一恒流单元向主LED单元提供恒定电流，光强检测单元检测主LED单元发出的光线强度，并将检测结果传递给控制单元，控制单元根据光强检测单元的检测结果来控制第一恒流单元提高向主LED单元供给的电流，通过增加流经主LED的电流的方式使得主LED单元发出的光线强度达到初始亮度值，当电流值提高至主LED可承受最大电流值时，控制单元切换至SS2。SS1: The control unit controls the first constant current unit to provide constant current to the main LED unit, the light intensity detection unit detects the light intensity emitted by the main LED unit, and transmits the detection result to the control unit, and the control unit according to the detection result of the light intensity detection unit To control the first constant current unit to increase the current supplied to the main LED unit. By increasing the current flowing through the main LED, the light intensity emitted by the main LED unit reaches the initial brightness value. When the current value increases to the maximum current that the main LED can withstand value, the control unit switches to SS2.
SS2：控制单元控制第二恒流单元向副LED单元提供恒定电流，光强检测单元检测副LED单元发出的光线强度，并将检测结果传递给控制单元，控制单元根据光强检测单元的检测结果来控制第二恒流单元提高向副LED单元供给的电流，通过增加流经副LED的电流的方式使得副LED单元发出的光线强度达到初始亮度值，当电流值提高至副LED可承受最大电流值时，控制单元切换至SS3。SS2: The control unit controls the second constant current unit to provide constant current to the auxiliary LED unit, the light intensity detection unit detects the light intensity emitted by the auxiliary LED unit, and transmits the detection result to the control unit, and the control unit uses the detection result of the light intensity detection unit To control the second constant current unit to increase the current supplied to the sub-LED unit, by increasing the current flowing through the sub-LED, the light intensity emitted by the sub-LED unit reaches the initial brightness value, when the current value increases to the maximum current that the sub-LED can withstand value, the control unit switches to SS3.
SS3：光强检测单元检测副LED单元在额定功率下发出的光线强度，并将检测结果传递给控制单元，若检测结果高于副LED单元的初始亮度值的60％时，则控制单元控制第二恒流单元向副LED单元提供副LED可承受最大电流值的85％，并控制第一恒流单元向主LED单元提供补偿电流，以使得主LED单元及副LED单元共同发出的光线强度达到初始亮度值；若检测结果低于副LED单元的初始亮度值的60％时，则控制单元控制第一恒流单元向主LED单元提供主LED可承受最大电流值的85％，并控制第二恒流单元向副LED单元提供补偿电流，以使得主LED单元及副LED单元共同发出的光线强度达到初始亮度值。SS3: The light intensity detection unit detects the light intensity emitted by the auxiliary LED unit at rated power, and transmits the detection result to the control unit. If the detection result is higher than 60% of the initial brightness value of the auxiliary LED unit, the control unit controls the first The second constant current unit provides 85% of the maximum current value that the auxiliary LED can withstand to the auxiliary LED unit, and controls the first constant current unit to provide compensation current to the main LED unit, so that the light intensity jointly emitted by the main LED unit and the auxiliary LED unit reaches Initial brightness value; if the detection result is lower than 60% of the initial brightness value of the auxiliary LED unit, the control unit controls the first constant current unit to provide 85% of the maximum current value that the main LED can withstand to the main LED unit, and controls the second The constant current unit provides compensation current to the auxiliary LED unit, so that the intensity of light emitted by the main LED unit and the auxiliary LED unit reaches an initial brightness value.
根据本发明的方案，通过增加驱动电流的方式以及切换主、副LED的方式来提高LED的亮度，确保LED光源亮度，即使使用一段时候后，用户也能看到正常的画面。According to the solution of the present invention, the brightness of the LED is increased by increasing the driving current and switching the main and auxiliary LEDs to ensure the brightness of the LED light source. Even after a period of use, the user can see a normal picture.
尽管在装置的上下文中已描述了一些方面，但明显的是这些方面也表示对应方法的描述，其中块或设备与方法步骤或方法步骤的特征相对应。类似地，在方法步骤的上下文中所描述的各方面也表示对应的块或项目或者对应装置的特征的描述。可以通过(或使用)如微液晶显示控制器、可编程计算机、或电子电路之类的硬件装置来执行方法步骤中的一些或所有。可以通过此类装置来执行最重要的方法步骤中的某一个或多个。Although some aspects have been described in the context of an apparatus, it is obvious that these aspects also represent a description of the corresponding method, where a block or device corresponds to a method step or a feature of a method step. Similarly, aspects described in the context of a method step also represent a description of the corresponding block or item or feature of the corresponding apparatus. Some or all of the method steps may be performed by (or using) hardware devices such as liquid crystal display controllers, programmable computers, or electronic circuits. One or more of the most important method steps can be carried out by means of such means.
所述实现可以采用硬件或采用软件或可以使用例如软盘、DVD、蓝光、CD、ROM、PROM、EPROM、EEPROM、或闪存之类的具有被存储在其上的电子可读控制信号的数字存储介质，所述电子可读控制信号与可编程计算机系统配合(或能够与其配合)以使得执行相应的方法。可以提供具有电子可读控制信号的数据载体，所述电子可读控制信号能够与可编程计算机系统配合以使得执行本文所描述的方法。The implementation may be in hardware or in software or may use a digital storage medium such as a floppy disk, DVD, Blu-ray, CD, ROM, PROM, EPROM, EEPROM, or flash memory having electronically readable control signals stored thereon. , the electronically readable control signals cooperate (or are capable of cooperating) with a programmable computer system to cause the corresponding method to be performed. A data carrier may be provided having electronically readable control signals capable of cooperating with a programmable computer system such that the methods described herein are carried out.
所述实现还可以采用具有程序代码的计算机程序产品的形式，当计算机程序产品在计算机上运行时，程序代码进行操作以执行该方法。可以在机器可读载体上存储程序代码。The implementation may also take the form of a computer program product having a program code operable to carry out the method when the computer program product is run on a computer. The program code can be stored on a machine readable carrier.
以上所描述的仅是说明性，并且要理解的是，本文所描述的布置和细节的修改和变化对于本领域技术人员而言将是明显的。因此，意在仅由所附权利要求的范围而不是由通过以上描述和解释的方式所呈现的特定细节来限制。What has been described above is illustrative only, and it is to be understood that modifications and variations in the arrangements and details described herein will be apparent to those skilled in the art. It is therefore the intention to be limited only by the scope of the appended claims rather than by the specific details presented by way of the foregoing description and explanation.
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| CN205487281U (en) * | 2016-01-11 | 2016-08-17 | 马鞍山瑞祥软件有限公司 | Computer LCD display display system |
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| CN101943357A (en) * | 2010-07-14 | 2011-01-12 | 深圳市华星光电技术有限公司 | Backlight module capable of dynamically adjusting brightness and method thereof |
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| CN1874631A (en) * | 2005-05-31 | 2006-12-06 | 台达电子工业股份有限公司 | Light source system and control method thereof |
| CN1979307A (en) * | 2005-12-06 | 2007-06-13 | 群康科技(深圳)有限公司 | Liquid crystal display |
| CN101165567A (en) * | 2006-10-18 | 2008-04-23 | 群康科技(深圳)有限公司 | Backlight system and liquid crystal display |
| CN101261388A (en) * | 2007-03-06 | 2008-09-10 | 中强光电股份有限公司 | Backlight device and control method thereof |
| CN205487281U (en) * | 2016-01-11 | 2016-08-17 | 马鞍山瑞祥软件有限公司 | Computer LCD display display system |
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