Array Substrate Shift Registers for Narrow Frame Touch Displays
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Solution Overview
Problem
In in-cell touch display panels, integrating touch electrodes into the array substrate increases the width of the non-display region, making it difficult to narrow the frame due to the occupation of layout areas by both scan and touch driving circuits, which also requires additional scan lines and I/O ports.
Innovation Solution
The solution involves reusing shift registers used for displaying to provide trigger and termination signals for touch scanning operations, allowing touch scanning to occur between display scanning operations, thereby reducing the number of circuit elements and layout area in the non-display region and minimizing the need for additional shift registers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If touch electrodes are integrated into the array substrate, then the thickness of the display panel is reduced, but the width of the non-display region is increased
Solution Approach 1:
The shift registers are designed to perform dual functions: driving display scan signals during display periods and providing control signals for touch scanning operations during touch periods. This multi-functionality eliminates the need for separate touch driving circuits, thereby reducing the non-display region width while maintaining the thin profile achieved through in-cell touch integration
2Adaptability or versatility
If separate touch driving circuit is added to the non-display region, then the touch function can be independently controlled, but the layout area of the non-display region is increased
Solution Approach 1:
The shift registers and control circuits are configured to handle both display scanning and touch scanning operations. During touch periods, the same circuits generate control signals for touch electrode scanning, eliminating the need for dedicated touch driving circuits and reducing the overall layout area of the non-display region
Solution Approach 2:
The display driving circuit and touch driving circuit are merged into a single integrated control system. The shift registers and control circuits serve both display and touch functions by time-multiplexing their operations, combining what would traditionally be separate circuits into one unified structure
3Adaptability or versatility
If additional shift register is provided for touch period, then the touch scanning can be independently controlled, but the number of circuit elements is increased
Solution Approach 1:
The existing shift registers are configured to operate in different modes depending on the period. During display periods, they drive display scan signals; during touch periods, they provide control signals for touch scanning. This eliminates the need for additional dedicated shift registers for touch operations, reducing circuit element count while maintaining independent touch control capability
Data Source
AI summary
The disclosure provides an array substrate, a touch display panel and a driving method that employ the array substrate. A driver circuit can be disposed in a non-display region of the array substrate, and can include a first and a second shift registers. The first shift register can include a first display scan signal outputting terminal outputting a first display scan signal, and the second shift register can include a second display scan signal outputting terminal outputting a second display scan signal. The array substrate can include a touch scanning circuit having a first control terminal connected to the first display scan signal outputting terminal, and a second control terminal connected to the second display scan signal outputting terminal. During a touch period, the touch scanning circuit outputs a touch signal through the touch signal outputting terminal according to the first and second display scan signals.