Touch Sensor Electrode Pattern Design for Image Quality
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Solution Overview
Problem
High-resolution touch sensors with integrated fingerprint sensing capabilities face challenges in maintaining image quality due to visible sensing electrodes, which deteriorate the optical properties of display devices.
Innovation Solution
A touch sensor design featuring a base layer with distinct regions for touch sensing and fingerprint sensing electrodes, including openings and connectors, enhances pattern similarity and transmittance by using insulating layers and specific electrode arrangements to minimize visual recognition and improve optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple sensing electrodes of different shapes and sizes are included in the touch sensor, then sensing capability is improved, but image quality deteriorates due to optical deviation
Solution Approach 1:
The patent applies local quality by creating different electrode patterns in different regions of the touch sensor. The first sensing electrode has a first pattern while the second sensing electrode has a second pattern, allowing each region to be optimized for its specific sensing function while maintaining overall image quality through careful pattern design that minimizes optical deviation
Solution Approach 2:
The patent introduces a third dimension by forming a three-dimensional structure where the first and second sensing electrodes are positioned at different heights or depths. This vertical arrangement allows multiple sensing functions to coexist without their patterns being visually superimposed, thereby maintaining image quality while providing enhanced sensing capability
2Adaptability or versatility
If sensing electrodes are made visible to enable multiple sensing functions, then adaptability is improved, but optical properties deteriorate
Solution Approach 1:
The patent employs asymmetry by using non-uniform electrode patterns where the first and second sensing electrodes have different geometric configurations. This asymmetric design allows the electrodes to be functionally distinct while their visual patterns are carefully coordinated to minimize optical deviation and maintain display quality
Solution Approach 2:
By arranging sensing electrodes in a three-dimensional configuration rather than a single plane, the patent eliminates the visual conflict that would arise from superimposed patterns. The vertical separation allows multiple sensing functions to be implemented without compromising optical properties, as the electrodes are viewed from different angles or depths
Data Source
AI summary
A touch sensor according to an embodiment of the present invention includes a base layer including a first region and a second region, a touch sensing electrode layer disposed on the first region of the base layer, the touch sensing electrode layer including a plurality of touch sensing unit electrodes having openings formed therein, and a fingerprint sensing electrode layer including a plurality of fingerprint sensing unit electrodes disposed on the second region of the base layer. A space having the same shape as that of the openings is formed between neighboring fingerprint sensing unit electrodes of the plurality of fingerprint sensing unit electrodes.