Touch Panel Corner Detection via Non-Uniform Optical Spacing
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Solution Overview
Problem
Conventional touch panels face challenges in accurately detecting touch positions due to limitations in the arrangement of light emitting and receiving devices, leading to reduced accuracy and increased manufacturing costs, as well as longer response times.
Innovation Solution
A touch panel design featuring a substrate with light emitting and receiving devices arranged such that the distance between adjacent devices decreases towards the corner, with a higher density of light receiving devices than light emitting devices, and varying radiation angles to enhance detection accuracy and reduce dead zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light emitting and receiving devices are arranged with uniform distance, then manufacturing is simpler, but touch position detection accuracy decreases near corners
Solution Approach 1:
The patent applies local quality by varying the spacing between optical devices based on their position on the substrate. Specifically, the distance between adjacent optical devices decreases as the devices approach the corner regions, creating non-uniform spacing that optimizes detection accuracy in different areas. This local adaptation resolves the contradiction by making the device arrangement complex only where necessary (near corners) while maintaining simpler spacing in central regions.
2Measurement precision
If more light receiving devices are added to improve detection accuracy, then manufacturing cost increases
Solution Approach 1:
The patent implements local quality by strategically placing light receiving devices only in regions where they are most needed - specifically near corner regions where uniform spacing fails to provide adequate detection accuracy. The non-uniform spacing pattern concentrates more receiving devices in corner areas while maintaining appropriate spacing in central regions, thereby improving overall detection accuracy without proportionally increasing manufacturing costs across the entire substrate.
3Reliability
If optical devices are arranged to cover corner areas, then dead zones are reduced, but device density increases
Solution Approach 1:
The patent applies local quality by adjusting the spacing of optical devices according to position, with tighter spacing specifically in corner regions to eliminate dead zones and improve coverage completeness. The non-uniform distribution pattern ensures that corner areas receive enhanced device density only where necessary, rather than uniformly increasing device density across the entire substrate, thus improving reliability without excessive increase in total device quantity.
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
This design improves touch position detection accuracy, reduces manufacturing costs, and enhances response time by optimizing the arrangement of light emitting and receiving devices, ensuring efficient and reliable touch panel operation.
Implementation Method 1
The optical devices may include one or more light emitting devices for emitting light and one or more light receiving devices for receiving the light emitted by the light emitting devices.
Data Source
AI summary
Provided are a touch panel and a display apparatus having the touch panel. The touch panel includes a substrate, and a plurality of optical devices arranged on the substrate, in which a distance between two adjacent optical devices of the plurality of optical devices may gradually decrease toward a corner of the substrate.