Bidirectional Gate Driving Circuit for Stable In-Cell Touch Scanning
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Solution Overview
Problem
Existing thin film transistor liquid crystal displays (TFT-LCD) with in-cell touch technology for active pens suffer from reduced stability and increased power consumption due to single-direction scanning, necessitating improved gate driving circuits.
Innovation Solution
A gate driving circuit with multiple scanning modes, including forward and reverse scanning, achieved through a cascade configuration of gate driving circuit units with pull-up and pull-down modules, utilizing transistors and clock signals to manage potential levels, thereby enhancing flexibility and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-direction scanning is used in gate driving circuits, then the circuit structure is simple, but the stability of gate driving circuits is reduced and power consumption is increased
Solution Approach 1:
The gate driving circuit implements dynamic scanning direction switching between forward and reverse directions. The circuit can adaptively change scanning direction based on touch input requirements, with control signals switching the conduction states of transistors to enable bidirectional operation. This dynamic adaptability improves stability and reduces power consumption while maintaining reasonable circuit complexity through systematic design.
2Device complexity
If single-direction scanning is used in gate driving circuits, then the circuit design is simple, but the power consumption is increased
Solution Approach 1:
The gate driving circuit employs periodic scanning cycles that can alternate between forward and reverse directions. By implementing periodic bidirectional scanning, the circuit distributes power consumption more evenly across different transistor groups, allowing certain transistors to rest during opposite-direction scanning phases. This periodic action reduces average power consumption while maintaining a structured circuit design.
3Device complexity
If single-direction scanning is used, then the scanning mechanism is simple, but the freedom of use of the display panel is reduced
Solution Approach 1:
The gate driving circuit is designed with multi-functionality to support both forward and reverse scanning modes within a single circuit structure. The same transistor array and control logic can operate in either direction depending on touch input requirements, making the display panel adaptable to different usage scenarios such as active pen input from different directions. This universality increases freedom of use without significantly increasing overall circuit complexity.
Data Source
AI summary
A gate driving circuit and a display panel are provided by the present application. An Nth stage gate driving circuit unit includes a first pull-up controlling module, a second pull-up controlling module, and a pull-up module. During a forward scanning, the first pull-up controlling module is configured to render the pull-up module to be turned on at the beginning of a scanning, and is further configured to pulled down a potential of the output terminal of the Nth stage gate driving circuit unit to a low potential at the end of the scanning. During a reverse scanning, the second pull-up controlling module is further configured to render the pull-up module to be turned on at the beginning of a scanning, and is configured to pull down a potential of the output terminal of the Nth stage gate driving circuit unit to a low potential at the end of the scanning.