In-Cell Touch Screen Gate Layer Signal Conversion
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Solution Overview
Problem
In-Cell touch screens using a time-division scanning method face limitations in detecting frequency due to alternating periods for display and touch operations, which affects the overall performance of the touch screen.
Innovation Solution
The touch screen design incorporates a gate layer with a touch driving electrode, a source-drain electrode layer with a touch sensing electrode line, and a second Indium Tin Oxide (ITO) layer with a touch sensing electrode pattern, allowing for improved detecting frequency by converting gate scanning signals into touch driving pulse signals and determining touch positions through a point-to-point design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a time-division scanning method is used for In-Cell touch screens, then the touch function can be realized, but the detecting frequency is limited due to alternating display and touch operation periods
Solution Approach 1:
The patent combines touch sensing and display operations into a single integrated process. The gate scanning signals are simultaneously used for both display driving and touch sensing, eliminating the need for separate time periods for each function. This merging of operations allows the touch detecting frequency to reach twice the display frequency while maintaining simple operation.
Solution Approach 2:
The gate scanning signals serve multiple functions: they drive the display operation and simultaneously perform touch sensing operation. This multi-functionality allows the same signal to accomplish both display updating and touch detection, thereby achieving high touch detecting frequency without adding separate dedicated touch driving signals.
2Ease of operation
If separate touch driving signals are used, then touch operation can be performed, but power consumption increases
Solution Approach 1:
The gate scanning signals are designed to perform dual functions: driving the display operation and enabling touch sensing operation. By making these signals multi-functional, the patent eliminates the need for separate touch driving signals, thereby reducing power consumption while maintaining full touch operation capability.
Solution Approach 2:
The gate scanning signals serve themselves by simultaneously performing both display driving and touch sensing functions. The same signal structure and transmission path are used for both purposes, making the system self-sufficient and eliminating redundant signal generation and transmission that would consume additional power.
Data Source
AI summary
A touch screen, a display device and a fabrication method of a touch screen are provided. The touch screen includes a gate layer, an insulating layer, a source-drain electrode layer, a first Indium Tin Oxide (ITO) layer, a protective layer and a second ITO layer. The insulating layer is overlaid on the gate layer, the source-drain electrode layer is overlaid on the insulating layer, the first ITO layer is overlaid on the source-drain electrode layer, the protective layer is overlaid on the first ITO layer, and the second ITO layer is overlaid on the protective layer; the gate layer includes a touch driving electrode, the source-drain electrode layer includes a touch sensing electrode line, and the second ITO layer includes a touch sensing electrode pattern.