Optical Touch System Using Wavelength Differentiation for Multi-User Interaction
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Solution Overview
Problem
Current multi-point touch control systems cannot distinguish between simultaneous touch operations performed by different users, limiting their application scope to only allow single operation purposes at a time.
Innovation Solution
An optical touch system utilizing two touch devices emitting distinguishable lights and optical sensing devices with separate wavelength filters to identify and differentiate touch positions, allowing independent operations by multiple users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-point touch control treats all touch points as a single operation base, then the system structure remains simple, but it cannot distinguish simultaneous touch operations by different users
Solution Approach 1:
The patent applies wavelength differentiation (analogous to color changes) by assigning different wavelength bands to different touch devices. Each touch device emits light at a specific wavelength, and optical filters detect these wavelengths to identify which device is being touched. This allows the system to distinguish between simultaneous touches by different users while maintaining a relatively simple system structure.
2Measurement precision
If optical filters with different wavelength bands are introduced to distinguish touch devices, then touch operation differentiation is enabled, but device complexity increases
Solution Approach 1:
The optical sensing device is segmented into multiple sensing areas, each equipped with an optical filter for a specific wavelength band. This segmentation allows each sensing area to independently detect light from a specific touch device, improving measurement precision for touch position identification while distributing the complexity across modular components rather than concentrating it in a single complex unit.
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
Enables simultaneous interactive touch operations between users by accurately determining the position of each touch device on the touch surface, expanding the application scope of multi-point touch control systems.
Implementation Method 1
The first optical filter allows light within a first wavelength band to pass; the second optical filter allows light within a second wavelength band to pass
Implementation Method 2
Each optical sensing device uses the optical sensing unit to sense the first light and the second light and generates an optical sensing signal
Data Source
AI summary
An optical touch system includes two touch devices, two optical sensing devices, and a processing module. When the optical touch system is in use according to an optical touch method, the two touch device are used to touch a touch surface and emit first light and second light with different wavelengths respectively. The two optical sensing devices are disposed at the circumference of the touch surface and individually receive the first light and the second light to generate an optical sensing signal. The processing module receives the two optical sensing signals and determines a touch position on the touch surface for each touch device according to the two optical sensing signals. Therefore, the touching by each touch device is independent, so the optical touch system and the optical touch method can allow touch operations for different purposes to be performed simultaneously.