Liquid crystal screen and method for eliminating black screen of liquid crystal screen
A technology for LCD screens and LCD TVs, which is applied to instruments, static indicators, etc. It can solve the problems of black screens, black screens, and screens not being bright on LCD screens, and achieves the effects of short judgment time, high cost performance, and simple methods
Inactive Publication Date: 2012-05-30
SICHUAN CHANGHONG ELECTRIC CO LTD
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Problems solved by technology
At present, the most common problem is the black screen problem of the LCD screen: for example, after the LCD TV is turned on for the first time, the screen turns black quickly after being turned on; or the screen is not brightened, but the sound can work normally; Machine operation, maybe the whole machine can also start normally
If the starting current, matching characteristics, starting frequency and other indicators of the lamp are not well matched with the inverter, it may cause the inverter's driving ability to be insufficient and enter the protection state prematurely, resulting in a black screen
Method used
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Embodiment
[0017] This embodiment example adopts the above invention scheme, aiming at the LC420WUN-SAA1 LCD screen, to realize the automatic elimination of the black screen of the LCD screen.
[0018] After the LCD screen is turned on for lighting, the LCD TV signal processing board continuously detects the 14PIN of the inverter according to its own cycle. The moment the backlight is lit (backlight switch voltage V BL Is high), a larger current is required. The inverter may not output too much current due to the low temperature, resulting in protection action without inverter switching voltage V ON / OFF Output like figure 2 As shown, at this time, the LCD screen turns on and then goes black. The LCD TV signal processing board passes the inverter status detection pin. If it is low level for three consecutive times, the backlight will be turned on again after a delay of 500ms.
[0019] In standby or PC sleep mode, cancel the detection of the inverter status detection pin.
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The invention relates to video display technology, and provides a liquid crystal screen capable of automatically detecting and eliminating a blank screen caused by abnormal work of an inverter and a method for eliminating the blank screen. The liquid crystal screen comprises the inverter and a liquid crystal television signal processing panel, and also comprises an inverter state detecting pin. One end of the inverter state detecting pin is connected with the inverter, and the other end of the inverter state detecting pin is connected with the liquid crystal television signal processing panel; the inverter state detecting pin is used for detecting whether the inverter works normally, and when a high level output by the inverter state detecting pin is detected out, the liquid crystal television signal processing panel does not process a backlight switching signal; and when a low level output by the inverter state detecting pin is detected out, the liquid crystal television signal processing panel starts the backlight switching signal after the preset time. The technology eliminates the problem of adverse match of the inverter and a light tube of the individual liquid crystal screen, and is applicable to various liquid crystal screens.
Description
Technical field [0001] The present invention relates to video display technology. Background technique [0002] With the widespread use of LCD screens, more and more quality issues involving LCD screens have been exposed. At present, the most common problem is the black screen problem of the LCD screen: for example, after the LCD TV is turned on for the first time, the screen turns black quickly after the screen is turned on; or the screen is not bright when the screen is turned on for the first time, but the sound can work normally; sometimes the user repeatedly switches on and off If the machine is operated, the whole machine may also be able to boot normally. Moreover, once the machine is turned on normally, the display and operation functions of the whole machine can be restored to normal; however, a black screen may still appear when the machine is turned off and then turned on. This situation is less likely to occur and is not easy to reproduce on the production line, but...
Claims
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IPC IPC(8): G09G3/36
Inventor 梁敏江友才
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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