Light Touch Panel Infrared Detection Accuracy
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Solution Overview
Problem
Long range infrared touch panels suffer from low accuracy and sensitivity due to weak light intensity received by detectors after infrared light scattering, resulting in inaccurate touch position determination and low touch resolution.
Innovation Solution
The use of hydrogenated nanometer silicon film as light sensitive elements on a substrate to convert incident infrared light directly into electric current signals, allowing for more accurate and sensitive touch position determination, and the integration of these elements in a matrix arrangement with a control unit to process these signals for precise touch control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If scattered light detection method is used, then long range touch is enabled, but touch position determination accuracy deteriorates
Solution Approach 1:
The patent replaces the optical scattering detection method with a direct infrared light detection method using photodetectors. Instead of detecting scattered visible light, the system uses infrared light that is less susceptible to scattering and directly detectable by photodetectors, thereby maintaining long-range detection capability while significantly improving touch position determination accuracy.
Solution Approach 2:
The patent changes the wavelength parameter of the detected light from visible light to infrared light. This parameter change allows the light to penetrate atmospheric conditions better and reduce scattering effects, enabling both long-range detection and high precision positioning simultaneously.
2Length of moving object
If scattered light detection is used, then long range touch is achieved, but touch sensitivity deteriorates
Solution Approach 1:
The system substitutes the scattered light detection mechanism with direct infrared light detection using photodetectors. This substitution enables the system to detect infrared light directly without relying on scattering, thereby maintaining long-range detection while significantly improving touch sensitivity and reliability through stronger and more direct light detection.
3Length of moving object
If scattered infrared light is received, then long range touch is enabled, but light intensity received deteriorates
Solution Approach 1:
The patent replaces the scattered light detection system with a direct infrared light detection system using photodetectors. This substitution eliminates the light intensity loss caused by scattering, allowing the system to maintain long-range detection capability while receiving sufficient light intensity for accurate and sensitive touch detection.
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 approach enhances the accuracy and sensitivity of touch position determination, improving the overall performance of light touch panels and display screens by directly absorbing and converting infrared light into electric signals, reducing interference from external light sources.
Implementation Method 1
the light sensitive element comprises hydrogenated nanometer silicon film for sensing touch infrared light and converting touch infrared light signals into current signals
Data Source
AI summary
A light touch panel, a light touch display screen and a light touch display device are disclosed. The light touch panel includes a substrate (1) and one or more light sensitive elements (2) disposed on the substrate, wherein the light sensitive elements (2) are configured to convert touch infrared light incident onto them into current signals to facilitate determining a touch position of the touch infrared light according to the electric current signals. The light touch panel converts touch infrared light that is incident onto it into current signals with light sensitive elements, thereby enabling the light touch panel to determine touch position of touch infrared light more accurately and sensitively, and in turn improve light touch performance of light touch panels.