Shift Register Touch Switching Module for Narrow Bezel Displays
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Solution Overview
Problem
Conventional gate driver circuits for TFT display panels are complex and inflexible, making it difficult to provide a narrow bezel and adjust touch periods within a display frame, especially when multiple touch periods are required, as they rely on cascaded shift registers with fixed control signals and lines.
Innovation Solution
A shift register with an input module, resetting module, touch switching module, node control module, and output modules that allow for dynamic adjustment of node potentials and electrical connections/disconnections based on control signals, enabling touch periods to be inserted between any display periods without compromising the display function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple gate driver circuits are connected in cascaded manner to provide multiple touch periods, then the touch control scanning rate is improved, but the circuit complexity increases and the bezel width cannot be reduced
Solution Approach 1:
The shift register is designed to perform both display scanning and touch scanning functions through a single circuit. The touch switching module enables the same shift register to output display scanning signals during display periods and touch scanning signals during touch periods, eliminating the need for separate gate driver circuits for each function and reducing overall circuit complexity while maintaining high touch control scanning rate
Solution Approach 2:
The shift register dynamically switches between display scanning mode and touch scanning mode based on timing control signals. The touch switching module responds to different clock signals (first clock signal for display, second clock signal for touch) to change the output function, allowing flexible adjustment of touch periods within display frame without adding complex fixed circuitry
2Adaptability or versatility
If multiple gate driver circuits are used to provide multiple touch periods, then the touch scanning capability is improved, but the control signals and control lines increase making the structure too complex for narrow bezel
Solution Approach 1:
A single shift register handles both display and touch scanning functions by responding to different clock signals. The same shift register outputs display scanning signals when receiving the first clock signal and touch scanning signals when receiving the second clock signal, significantly reducing the number of control lines and signals needed compared to using separate gate driver circuits for each function
Solution Approach 2:
The display scanning function and touch scanning function are merged into a single shift register circuit. The touch switching module combines the control of display clock signals and touch clock signals to enable one circuit to perform multiple scanning tasks, reducing wiring space and control line complexity for narrow bezel design
3Device complexity
If conventional shift registers are used with fixed control signals, then the circuit structure is simple, but the touch periods cannot be flexibly adjusted within display period
Solution Approach 1:
The shift register incorporates dynamic switching capability through the touch switching module, which responds to different clock signals (first clock signal for display, second clock signal for touch) to change output functions in real-time. This allows flexible adjustment of touch periods within display frame while maintaining relatively simple circuit structure, as the same hardware adapts its function based on timing control rather than requiring complex reconfigurable circuitry
Data Source
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AI summary
The present disclosure provides a shift register, its driving method, a gate driver circuit and a display device. The shift register includes an input module, a resetting module, a touch switching module, a node control module, a first output module and a second output module. In the shift register, through the cooperation of the above six modules, it is able to provide a touch stage between any two adjacent time periods of a display stage, it enables a driving signal output end of the shift register to output a DC signal at the touch stage, and enable the gate driver circuit to achieve a display function after the touch stage is ended.