Touch display control device and touch display device

Abstract

The embodiment of the invention discloses a touch display control device and a touch display device, and the touch display control device comprises a touch module which is used for carrying out touchdetection; a display control module which is used for performing display control; a common voltage input module which is used for providing a common voltage signal to a plurality of common voltage input nodes; and a selection module which is used for achieving display control and touch detection in a time-sharing mode. The touch display control device further comprises a compensation module connected between the selection module and the common voltage input nodes, the compensation module generates compensation control signals according to reference voltage and the node voltage, and the compensation control signals are used for gating a charging path or a discharging path connected with the public voltage input nodes. According to the embodiment of the invention, the voltage fluctuation atthe connection point between the touch display device and the touch display panel can be compensated, and the adjustment time is short, so that the occurrence of transverse lines or vertical lines ona display picture is avoided.

Description

technical field [0001] The present invention relates to the technical field of touch display, in particular to a touch display control device and a touch display device. Background technique [0002] Touch and Display Driver Integration (TDDI, Touch and Display Driver Integration) is a technology that integrates a touch chip and a display chip into a single chip, and has been more and more widely used in current touch displays. [0003] For a touch display device with integrated touch and display driver, the common voltage VCOM and the touch sensing channel share a node, and the display drive and touch detection are performed in time-sharing, and the touch lines of the touch display device must be connected during the display stage The common voltage VCOM will make it difficult to maintain the common voltage VCOM within an ideal voltage range, thereby affecting the display quality of the picture. [0004] figure 1 It shows an equivalent circuit diagram of the connection be...

AI Technical Summary

Problems solved by technology

The presence of lead resistance R and switch resistance R' will affect the voltage at node Q

When the node Q is connected to the common voltage VCOM during the display stage, the voltages at the various nodes Q1, Q2, ..., Qn are inconsistent, and in some extreme cases, it may even lead to failure to reach the desired common voltage VCOM within a limited charging time. As a result, there are horizontal or vertical lines on the display screen, which affects the display quality of the screen.

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