Gate driving circuit

Abstract

The invention discloses a gate drive circuit, which includes a drive circuit connected by a plurality of shift register units. The drive circuit includes a photocoupler and a photocoupler driver. The coupler is a fast type, which controls the high-frequency switching operation. The primary side of the optocoupler has a current-limiting resistor in series, and the voltage is directly applied to the input side; Step 2: Adopt a dual power supply drive structure, and integrate an optocoupler with high isolation voltage and Overcurrent protection circuit; step 3: overcurrent protection output signal terminal and input interface compatible with TTL level, the maximum delay of the driving electrical signal is 1.5u; step 4: in the gate drive circuit, located in the photocoupler The nearest shift register unit performs gate row drive scanning; step 5: in the gate drive circuit, the nearest shift register unit located in the photocoupler performs gate row drive scan; step 6: for steps 4 and 5 scan results in .

Description

technical field [0001] The invention relates to a circuit driving method, in particular to a gate driving circuit. Background technique [0002] With the increasing popularity of touch-sensitive display devices, people have higher and higher quality requirements for touch-sensitive display devices. In-cell touch technology is It is widely used due to its high advantages. [0003] A traditional GOA circuit usually includes a plurality of cascaded shift register units, wherein each shift register unit is respectively connected to an adjacent row of shift register units, and each shift register unit corresponds to a row of gate lines. When a row of shift register units outputs a gate driving signal, the next row of shift register units is precharged to ensure that the next row of shift register units realizes output in the next clock cycle. In the prior art, the shift register unit takes the simplest 4T1C structure as an example, because the N / 2+1 row shift register unit is t...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the PU point potential will leak through the connected TFT, thereby seriously affecting the pre-charging of the N / 2+1 row shift register unit, so that when the N / 2+1 row shift register unit outputs the voltage decrease, resulting in insufficient charging rate of pixels in this row, and poor dark or bright lines. The purpose is to provide a gate drive circuit to solve the problem that the PU point potential will leak through the connected TFT, which will seriously affect the N / 2+1 row shift. The pre-charging of the register unit makes the voltage drop when the shift register unit in the N / 2+1 row is output, which leads to insufficient charging rate of the pixels in this row, and the problem of dark or bright lines.