Photosensitive Detector with Accommodation Space for Low-Light Touch
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Solution Overview
Problem
Photosensitive touch screens struggle to detect touch positions accurately in low-light environments due to insignificant variations in light detection before and after a touch, leading to incorrect detection of touch operations.
Innovation Solution
A display panel design featuring a detector with a photosensitive portion and an accommodation portion, where the distance change between substrates alters the light received by the photosensitive portion, changing its resistance value and outputting different sensing signals to accurately determine touch operations, even in low-light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional photosensitive touch screen is used, then the structure is simple, but the detection sensitivity is insufficient in low-light environments
Solution Approach 1:
The detector is divided into two functional portions: a photosensitive portion for light detection and an accommodation portion for structural support and light path management. This segmentation allows each portion to be optimized for its specific function, improving overall detection sensitivity without excessive complexity
Solution Approach 2:
The accommodation portion extends in the thickness direction of the display panel, creating a three-dimensional structure that allows the photosensitive portion to be positioned at an optimal distance from the display surface. This dimensional extension enables improved light detection capability while maintaining a planar overall structure
2Speed
If the photosensitive portion is placed close to the display surface, then the touch detection responsiveness is improved, but the light reception capability is reduced
Solution Approach 1:
The detector structure exhibits local quality variation: the photosensitive portion is positioned closer to the display surface for rapid touch detection, while the accommodation portion extends deeper to provide structural support and manage light paths. This localized differentiation optimizes both responsiveness and light reception capability
3Measurement precision
If a light-shading structure is added to improve touch detection, then the detection accuracy is improved, but the display area is reduced
Solution Approach 1:
The photosensitive portion is nested within the accommodation portion, with the accommodation portion providing a housing structure that contains and protects the photosensitive element. This nested arrangement allows the detector to function effectively without requiring additional lateral space, maintaining display area while improving detection accuracy
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
Enhances detection sensitivity and accuracy by amplifying light changes at the touch position, preventing misinformation and allowing precise touch detection without shading the display, even with weak external light or when using touch tools like fingers or pens.
Implementation Method 1
the photosensitive portion senses a change of the received light, a resistance value of the photosensitive portion changes, and the photosensitive portion outputs a different sensing signal
Data Source
AI summary
Provided is a display panel including a first substrate, a second substrate placed opposite to the first substrate, and at least one detector placed between the first substrate and the second substrate; each of the at least one detector includes a photosensitive portion located at a side of the first substrate facing the second substrate, and an accommodation portion located between the photosensitive portion and the second substrate, the accommodation portion includes an accommodation space and an opening facing the photosensitive portion; when distance between the first and second substrates changes, an proportion of the photosensitive portion accommodated in the accommodation portion changes so that light received by the photosensitive portion changes; when the photosensitive portion senses change of the light received, a resistance value of the photosensitive portion changes, and then the photosensitive portion outputs a different sensing signal. Further provided is a display device containing the display panel.