Liquid crystal screen and method for eliminating black screen of liquid crystal screen

A technology for LCD screens and LCD TVs, applied in instruments, static indicators, etc., can solve the problems of LCD screen black screen, rapid black screen, screen not bright, etc., and achieve the effect of short judgment time, easy implementation and simple method.

Inactive Publication Date: 2009-08-12
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

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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  • Liquid crystal screen and method for eliminating black screen of liquid crystal screen
  • Liquid crystal screen and method for eliminating black screen of liquid crystal screen

Examples

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Embodiment

[0017] This implementation example adopts the above inventive scheme, and aims 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 powered on and turned on, the LCD TV signal processing board continues to detect the 14PIN of the inverter according to its own cycle. The moment the backlight is turned on (the backlight switch voltage VBL is high), a large current is required, and the inverter may not be able to output too much current due to the temperature being too low, resulting in protection action without inverter switch voltage VON / OFF output, such as 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 state detection pin, if it detects three consecutive times and it is low level, the backlight will be turned on again after a delay of 500ms.

[0019] In standby or PC sleep mode, cancel the detection of...

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Abstract

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 invention relates to video display technology. Background technique [0002] With the widespread use of liquid crystal screens, more and more quality problems related to liquid crystal screens have also 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 being turned on; or the screen is not brightened, but the sound can work normally; machine operation, the whole machine may also be able to start normally. And once it is turned on normally, the display and operation functions of the whole machine can return to normal; but after turning it off and on again, there may still be a black screen phenomenon. This situation is less likely to occur and is not easy to reproduce on the production line, but it may have a greater impact on users. The lamp tube used in the LCD screen is a cold-cathode fluorescent la...

Claims

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Application Information

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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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