Liquid crystal panel driving circuit

Abstract

The invention provides a liquid crystal panel driving circuit. The circuit comprises an input end, a first resistor, a second resistor, a comparator, a light emitting diode, a latch, an RC circuit anda power supply voltage; the input end is connected to a grounding end through the first resistor and the second resistor which are sequentially connected in series; a positive input end of the comparator is connected to a reference voltage, and a negative input end of the comparator is connected between the first resistor and the second resistor; a positive electrode of the light emitting diode is connected to the output of the comparator, and a negative electrode of the light emitting diode is connected to the latch; the input and output of the RC circuit are connected to the power supply voltage and the latch respectively. Compared with the prior art, the liquid crystal panel driving circuit is good in reliability and excellent in user experience effect.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a liquid crystal panel drive circuit. Background technique [0002] With the development of display technology, more and more people are pursuing the realistic experience effect of stereoscopic display for TV, movies, etc., and the liquid crystal panel is the main component to realize the stereoscopic display. The LCD panel driving circuit used to drive the LCD panel includes a pulse width modulation integrated circuit (PWM IC). For the commonly used PWM IC, it has an UnderVoltage Lock Out (UVLO) voltage, that is, the input voltage is high. When it is at this value, PWM IC starts to work, and when the input voltage is lower than this value, PWM IC is turned off and there is no output anymore. [0003] However, in the process of using the TV, we will encounter the instability of the mains power, which will cause the voltage to drop suddenly and then recover. Because the time of...

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Problems solved by technology

[0003] However, in the process of using the TV, we will encounter the instability of the mains power, which will cause the voltage to drop suddenly and then recover. Because the time of the voltage drop is too short, the PWM IC will be turned off for an instant and then restarted. At this time, the output of each output The voltage cannot be fully discharged

Especially for the screen driver board (Timing Controller, TCON), if the power supply voltage VDD3.3V and the core voltage Vcore are not fully discharged, and then restarted, it may cause timing disorder, resulting in abnormal output, abnormal picture, or even Cause irreversible damage to the LCD panel, seriously affecting the user experience

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