TOUCH DRIVING CIRCUIT, LIQUID CRYSTAL PANEL AND ITS DRIVING METHOD

摘要

The present disclosure provides a touch driving circuit, a liquid crystal panel and its driving method, so as to prevent the occurrence of an error due to non-uniform parameters of elements in the touch driving circuit, thereby to improve the reliability of a touch screen panel. The touch driving circuit includes a photoelectricity generation unit, an amplification unit, an output control unit and an amplification control unit.

主权项

1. A touch driving circuit, comprising a photoelectricity generation unit, an amplification unit, an output control unit and an amplification control unit, wherein
the photoelectricity generation unit is connected between an initial signal line and the amplification control unit. the amplification control unit is connected between a gate scanning signal line for current-row pixels and a gate scanning signal line for previous-row pixels, and connected to the photoelectricity generation unit, the amplification unit and the output control unit, wherein the amplification control unit is configured to, when a gate scanning signal for the current-row pixels is at a first level and a gate scanning signal for the previous-row pixels is at a second level, receive a level of the initial signal line by the photoelectricity generation unit, wherein the initial signal line inputs the first level and then an initial level, so that a level at a connection point between the amplification control unit and the amplification unit is a sum of the initial level and an on-state voltage of the amplification unit, and wherein the amplification control unit is further configured to, when the gate scanning signal for the current-row pixels is at the second level, the gate scanning signal for the previous-row pixels is at the second level and the initial signal line inputs the initial level, decrease the level at the connection point between the amplification control unit and the amplification unit when a touch is not sensed by the photoelectricity generation unit, the amplification unit is connected between the initial signal line and the output control unit, and connected to the amplification control unit via the connection point, and the amplification unit is configured to output a current to the output control unit in accordance with the level at the connection point, the output control unit is connected between a data output line and the amplification unit, and connected to the gate scanning signal line for the previous-row pixels, and the output control unit is configured to, when the gate scanning signal for the current-row pixels is at the second level, the gate scanning signal for the previous-row pixels is at the first level and the initial signal line inputs the initial level, output the current outputted from the amplification unit to the data output line, and a value of the initial level is in a range between the first level and the second level.