Touch Scanning Circuit for Narrow Bezel Displays
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Solution Overview
Problem
In-cell touch panels face challenges in implementing large-size and narrow-bezel designs due to the increased space occupied by wirings for transmitting touch scanning signals, limiting their application in large-size display devices.
Innovation Solution
A touch scanning circuit with a simple structure integrated on an array substrate, comprising an input sub-circuit, first and second control sub-circuits, shift output sub-circuit, and touch output sub-circuit, which controls node potentials and connections to stabilize voltage differences and ensure signal output stability, reducing the need for border area wirings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If touch scanning signals are transmitted through wirings disposed at border area, then signal transmission is achieved, but bezel width increases and large-size narrow-bezel design is limited
Solution Approach 1:
The patent merges the touch scanning circuit with the display pixel circuit by integrating the touch scanning signal generation function into the existing pixel circuit structure. Specifically, the pixel circuit is designed to simultaneously perform display function and touch scanning signal generation, eliminating the need for separate border area wirings. This integration directly reduces bezel width while maintaining signal transmission capability.
Solution Approach 2:
The patent transitions the touch scanning signal transmission from a horizontal border-area routing approach to a vertical in-cell routing approach. By utilizing the space within the display pixel structure itself (moving from 2D border routing to 3D in-pixel integration), the design achieves narrow bezel width while maintaining complete signal transmission paths for touch scanning.
2Area of stationary object
If touch scanning circuit is integrated on array substrate, then wiring space is reduced, but circuit structure complexity increases
Solution Approach 1:
The integrated circuit structure performs multiple functions: it generates touch scanning signals, transmits them to touch scanning lines, and maintains signal stability. By designing the pixel circuit to simultaneously handle display and touch scanning functions, the patent reduces the need for separate dedicated touch scanning circuitry, thereby reducing border area wiring space while keeping the integrated structure manageable through functional consolidation.
Solution Approach 2:
The patent segments the touch scanning circuit into modular sub-circuits that can be independently designed and integrated. The touch scanning circuit is divided into signal generation units, signal transmission units, and control units, each implemented within the pixel circuit structure. This segmentation allows for systematic integration that manages complexity while achieving the goal of reducing border area wiring space.
Data Source
AI summary
A touch scanning circuit and a driving method thereof, a touch driving circuit and a display panel. The touch scanning circuit includes: an input sub-circuit, a first control sub-circuit, a second control sub-circuit, a shift output sub-circuit and a touch output sub-circuit. The input sub-circuit is configured to control a potential of a first node; the first control sub-circuit is configured to control connection and disconnection between the first node and a third node; the second control sub-circuit is configured to control a potential of a second node; the shift output sub-circuit is configured to control a potential of a shift output end according to the third node and the second node; and the touch output sub-circuit is configured to control a signal outputted from a touch output end according to the second node, the shift output end and the first clock signal end.