Touch Driving Circuit Integration for Slim Bezel Displays
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Solution Overview
Problem
Conventional touch display devices face challenges in achieving a slim bezel design due to the complexity and space occupation of their touch driving circuits, which also increase the cost of integrated circuits and limit touch scanning efficiency.
Innovation Solution
The design incorporates a simplified touch driving circuit with a gate driving circuit and touch driving circuit arrangement that allows for staggered scanning and dual-sided signal provision, reducing the number of signal input terminals and IC costs, while enabling touch scanning in each half frame for improved report frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a conventional touch driving circuit is used, then the touch display device can achieve touch scanning function, but the circuit occupies large space in bezel area making slim bezel design difficult
Solution Approach 1:
The patent combines the gate driving circuit and touch driving circuit into a single integrated structure. The touch selective output modules share the same physical space and signal lines as the gate driving circuit, eliminating the need for separate circuit areas and enabling slim bezel design.
Solution Approach 2:
The circuit is designed to perform multiple functions: during display mode it drives gate lines for image refresh, and during touch mode it scans touch driving electrodes. The same shift registers and signal lines are reused for both gate driving and touch scanning operations, reducing overall circuit complexity.
2Ease of manufacture
If a conventional touch driving circuit is used, then touch scanning can be performed, but the number of signal input terminals increases raising IC cost
Solution Approach 1:
The patent merges the signal input requirements by having the touch selective output modules share signal lines with the gate driving circuit. The same clock signals, reset signals, and data lines are used for both gate driving and touch scanning, significantly reducing the number of required IC pins.
Solution Approach 2:
The circuit uses its own internal signal lines and resources to perform touch scanning without requiring additional dedicated input terminals. The shift registers generate their own scan signals and the same infrastructure serves both display and touch functions.
3Productivity
If touch scanning is performed once per frame, then circuit complexity is reduced, but scanning efficiency and report frequency are limited
Solution Approach 1:
The patent implements periodic touch scanning by dividing each frame into multiple half-frames, with touch scanning performed in alternating half-frames. This periodic approach allows touch scanning to occur twice per full frame cycle, doubling the report frequency while maintaining circuit simplicity through systematic timing control.
Solution Approach 2:
The circuit dynamically switches between display mode and touch scanning mode within each frame cycle. The same hardware infrastructure is flexibly allocated to different functions at different time periods, achieving higher scanning efficiency without requiring dedicated hardware for each function.
Data Source
AI summary
An array substrate, a touch display device and a driving method thereof are provided by the present disclosure. The array substrate includes a gate driving circuit and a touch driving circuit provided in a non-display area. The touch driving circuit includes multiple groups of touch selective output modules. Every group of touch selective output module includes two strobe signal input terminals for which the strobe signals are provided by secondary trigger signal output terminals of two adjacent shift registers in the gate driving circuit.