Touch Panel Sensing Electrode Segmentation for Aperture Ratio
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Solution Overview
Problem
Inner type touch panels face issues with reduced aperture ratio and instability due to the formation of sensing electrodes and spacers, leading to inaccurate stimulus sensing and panel shifting when external stimuli are applied.
Innovation Solution
The design includes separate sensing electrodes for X and Y position detection, positioned in different areas from the thin film transistors, with a sensing spacer that contacts both electrodes, maintaining a stable structure and aperture ratio by avoiding stepped parts and ensuring accurate signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two sensing electrodes to sense X and Y positions are formed in one pixel, then the sensing function is improved, but the aperture ratio of the pixel decreases
Solution Approach 1:
The sensing function is divided into two separate electrodes: a first sensing electrode for X-position sensing and a second sensing electrode for Y-position sensing. These electrodes are disposed in different spatial locations rather than both being confined to a single pixel, thereby enabling position detection while preserving pixel aperture ratio.
Solution Approach 2:
The sensing electrodes are arranged in different spatial dimensions and locations across the display panel. The first sensing electrode is positioned in a first region while the second sensing electrode is positioned in a second region, utilizing spatial distribution to achieve both sensing accuracy and maintain aperture ratio.
2Ease of manufacture
If the spacer is provided over a thin film transistor, then the sensing structure is formed, but the display panel is shifted because of a stepped part formed below the spacer
Solution Approach 1:
The sensing electrodes are extracted from the pixel area and disposed in separate regions (first region and second region) where they do not create stepped parts over thin film transistors. This separation eliminates the structural instability caused by spacers positioned over TFTs while maintaining the sensing function.
3Device complexity
If sensing electrodes are formed in the same region as thin film transistors, then the sensing function is integrated, but the structure becomes unstable when external stimulus is applied to the stepped part
Solution Approach 1:
The display panel is segmented into different functional regions: pixel regions containing thin film transistors and separate sensing regions containing sensing electrodes. This spatial segmentation prevents the formation of stepped parts at the interface between sensing and transistor regions, eliminating the instability issue while maintaining integrated sensing functionality.
Data Source
AI summary
A display device that is capable of reliably sensing a contact with a touch panel is presented. The device includes: a first insulating substrate; a first sensing line disposed on the first insulating substrate in a predetermined direction; a first pixel disposed on the left side of the first sensing line; a second pixel disposed on the right side of the first sensing line; a first data line disposed on the left side of the first pixel; and a second data line disposed on the right side of the second pixel. The first pixel is connected with the first data line and the second pixel is connected with the second data line.