Gate Driver Circuit Pre-Charging for Touch Display Driving Time
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Solution Overview
Problem
In-Cell touch display devices face challenges in maintaining normal touch recognition and display performance due to the compression of the blank period between frames, which affects the driving time for touch stages and display stages, leading to undercharging of pixel units and impaired display quality.
Innovation Solution
A gate driver circuit with cascaded GOA unit groups and control units that pre-charge the first stage shift register of the next GOA unit group after the last stage shift register completes driving, allowing for increased touch driving time and ensuring normal display by optimizing the driving time for both touch and display stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the blank period between frames is compressed due to increased display resolution, then the display quality is improved, but the touch driving time becomes insufficient
Solution Approach 1:
The control unit outputs a start control signal at a high level to pre-charge the first stage shift register of the next GOA unit group before the touch driving operation begins. This preliminary charging action ensures that the shift register is ready to operate during the compressed blank period, enabling sufficient touch driving time even when the blank period is reduced due to high display resolution requirements
2Duration of action of moving object
If the charging time for pixel units is reduced in the display stage, then the touch driving time is ensured, but the pixel units become undercharged affecting display quality
Solution Approach 1:
The first stage shift register is pre-charged in advance by the control unit before the display stage begins. This preliminary charging ensures that when the display stage operates with reduced charging time, the pixel units still receive adequate charge because the shift register is already prepared with the necessary charge levels, thus maintaining display quality while ensuring sufficient touch driving time
Solution Approach 2:
The gate driver circuit is divided into multiple GOA unit groups with control units between them. This segmentation allows independent control and pre-charging of different sections, enabling the first stage shift register of the next GOA unit group to be pre-charged without affecting the current display stage operation, thus resolving the conflict between touch driving time and display quality
Data Source
AI summary
Embodiments of the present invention provide a gate driver circuit, a touch display device and a touch display driving method. The gate driver circuit includes a plurality of GOA unit groups arranged successively and control units arranged between every two adjacent GOA unit groups, each of the GOA unit groups comprising a plurality of shift registers which are cascaded. The control unit is configured to output a start control signal at a high level to a signal input end of a first stage shift register of a next GOA unit group corresponding thereto, after a last stage shift register of a previous GOA unit group corresponding thereto completes driving for a corresponding gate line and a predetermined time elapses, so as to pre-charge the first stage shift register of the next GOA unit group.