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
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[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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