In-Cell Touch Panel Electrode Segmentation for Sensitivity
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Solution Overview
Problem
Existing in-cell touch panels face challenges in balancing appearance and detection sensitivity, as subdividing dummy electrodes to reduce visibility can increase resistance and affect detection sensitivity, while maintaining uniform pattern distribution and narrow gaps between electrodes.
Innovation Solution
A display device with built-in touch panel featuring detection electrodes with slits and dummy electrodes arranged in specific patterns to enhance appearance and sensitivity, where the slits and dummy electrodes are aligned to maintain uniformity and reduce resistance, allowing for visual subdivision of detection electrodes without cutting them, thereby improving detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If dummy electrodes are subdivided with many cuts to reduce visibility, then appearance is improved, but detection sensitivity deteriorates due to increased resistance
Solution Approach 1:
The detection electrode is divided into multiple segments by forming slits, creating a patterned structure that reduces visibility while maintaining electrical continuity through the underlying conductive layer, thus improving appearance without sacrificing detection sensitivity
Solution Approach 2:
A light-blocking layer is introduced as an intermediary element between the detection electrode and the viewer, selectively blocking light to reduce electrode visibility while allowing the electrode to maintain its electrical function for touch detection
2Shape
If detection electrodes are subdivided into multiple portions to match dummy electrode pattern, then appearance is improved, but resistance increases proportionally reducing detection sensitivity
Solution Approach 1:
The detection electrode is segmented into multiple portions by slits to create uniform pattern distribution with dummy electrodes, improving appearance while the segments remain electrically connected through the conductive layer to maintain low resistance
Solution Approach 2:
Different regions of the detection electrode structure serve different functions: the slits provide visual segmentation for appearance, while the continuous conductive layer beneath maintains electrical conductivity for sensitivity, achieving local optimization of both appearance and function
3Shape
If gap between detection electrodes is reduced to 50 μm or less for uniform pattern, then appearance is improved, but detection sensitivity may be compromised
Solution Approach 1:
The detection electrodes and dummy electrodes are both segmented into patterns with consistent dimensions, creating uniform pattern distribution that improves appearance while the segmented structure allows for optimized gap spacing that maintains detection sensitivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances both the appearance and detection sensitivity of the touch panel by maintaining uniformity and reducing resistance, allowing for effective touch detection while minimizing visibility issues.
Implementation Method 1
an image is displayed by controlling light using electric fields generated between the plurality of pixel electrodes and the plurality of common electrodes
Implementation Method 2
the presence or absence of a touch is detected by a difference in electrostatic capacitance due to the presence or absence of a substance blocking an electric field formed between any of the detection electrodes and any of the common electrodes
Data Source
AI summary
A difference between a length Ls of a slit and a length Ld of a dummy electrode is within ±15% of the length Ld. A difference between a length Le in the first direction of a portion between the slits adjacent to each other in the first direction in a detection electrode and the length Ld of the dummy electrode is within ±15% of the length Ld. A difference between a width Ws of the slit and a gap Dde between the dummy electrode and the detection electrode adjacent to each other in the second direction is within ±15% of the gap Dde. A difference between a width We in the second direction of a portion obtained by dividing the detection electrode by the slit and a width Wd of the dummy electrode is within ±15% of the width Wd.