Optical Touch Screen With Intersecting Channels
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Solution Overview
Problem
Conventional touch screens suffer from reduced service life due to direct contact and positioning accuracy issues, especially in public applications where large displays are used, as they require direct contact and have non-linear positioning relationships affecting accuracy.
Innovation Solution
An optical touch screen system with an optical touch panel and intersecting first and second optical transmission channels, equipped with sensors to detect light emitted by these channels, improving positioning accuracy through triangulation and using up-conversion luminescent materials for long-distance control with visible light to prevent error touches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If direct contact touch panel is used, then touch operation is simple and direct, but service life is reduced due to fingerprints and scratches
Solution Approach 1:
The patent introduces an optical transmission channel as an intermediary between the user and the display screen. Users interact with the system by touching the optical transmission channel, which transmits light signals to sensors without requiring direct contact with the display screen itself, thereby preserving the simplicity of touch operation while extending service life
Solution Approach 2:
The patent replaces the traditional mechanical direct-contact touch panel with an optical-based interaction system. Instead of mechanically sensing direct pressure on the display surface, the system uses optical transmission channels to convey touch information to sensors, substituting mechanical contact with optical signal transmission
2Area of stationary object
If conventional touch screen is used in public places, then large display size is achieved, but positioning accuracy deteriorates due to non-linear positioning relationship
Solution Approach 1:
The patent replaces the conventional mechanical touch sensing system with an optical sensing system. The optical transmission channels transmit light signals that are detected by sensors, enabling precise positioning through optical measurement rather than mechanical coordinate mapping, thus maintaining high positioning accuracy on large displays
Solution Approach 2:
The patent transitions from a two-dimensional mechanical coordinate system to a three-dimensional optical path system. By utilizing the spatial arrangement and intersection of multiple optical transmission channels in three-dimensional space, the system achieves more precise positioning capability on large display surfaces
3Length of stationary object
If infrared phosphor material is used for optical touch panel, then long-distance control is enabled, but positioning accuracy is affected by triangulation method
Solution Approach 1:
The patent segments the optical transmission into multiple independent channels with different spatial orientations. Instead of relying on a single triangulation calculation from two sensors, the system divides the optical detection into multiple discrete channels, each providing independent position information that can be more accurately integrated
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 positioning accuracy and extends the service life of touch screens by allowing long-distance interaction and reducing errors through linear coordinate determination and the use of visible light for touch detection.
Implementation Method 1
The first sensor is disposed on at least one end of the first optical transmission channel and configured to receive light emitted by the first optical transmission channel
Implementation Method 2
the luminous position is detected and positioned by triangulation
Data Source
AI summary
An optical touch screen and a display device are disclosed. The optical touch screen (200) comprises an optical touch panel (210) and a first sensor (220) and a second sensor (230). The optical touch panel (210) comprises a first optical transmission channel (211) and a second optical transmission channel (212) which are intersected with each other. The first sensor (220) is disposed on at least one end of the first optical transmission channel (211) and configured to receive light emitted by the first optical transmission channel (211). The second sensor (230) is disposed on at least one end of the second optical transmission channel (212) and configured to receive light emitted by the second optical transmission channel (212). The optical touch screen and the display device can improve the positioning accuracy of the touch position.