Optical Coordinate Input Device Overexposure Resolution
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Solution Overview
Problem
Existing optical coordinate input devices face challenges in large size applications due to limitations in resolution and overexposure issues when using resistive-type or capacitance-type touch panels, leading to increased manufacturing costs and inaccurate coordinate detection.
Innovation Solution
The optical coordinate input device comprises a frame with multiple touch detection areas and modules, where each module is located on different surfaces of the frame, allowing for simultaneous detection and calculation of touch coordinates to avoid overexposure and enhance resolution, with overlapping areas used to manage overexposed signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lens size of camera modules is increased to improve resolution ability, then the measurement precision is improved, but the device complexity and manufacturing cost increase hugely
Solution Approach 1:
The touch detection system is divided into multiple detection modules (first detection module and second detection module) positioned at different locations on the frame. Each module independently detects touch coordinates in its respective field of view, allowing the system to achieve high resolution across large touch surfaces without requiring excessively large lenses in single camera modules.
2Reliability
If the emitting strength of camera modules is enhanced to amplify corner signals, then the signal strength is improved, but the signals of touch-points near camera modules become overexposed causing incorrect coordinates
Solution Approach 1:
Different detection modules are positioned at different locations on the frame to create locally optimized detection zones. The first detection module detects the first touch detection area while the second detection module detects the second touch detection area, allowing each module to operate within its optimal signal range without overexposure issues.
3Ease of manufacture
If resistive-type or capacitance-type touch control panels are used for small size devices, then the ease of manufacture is improved, but the manufacturing cost increases dramatically when applied to huge size devices
Solution Approach 1:
The patent replaces traditional mechanical touch detection methods (resistive or capacitance-type touch panels) with an optical detection system using camera modules. This substitution eliminates the need for complex large-scale touch panel manufacturing while enabling huge size touch surfaces, as the optical system only requires standard camera modules and frame structures.
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 solution enables precise coordinate detection across large touch control areas without the limitations of resolution and overexposure, reducing manufacturing costs and improving accuracy in huge size devices.
Implementation Method 1
The first camera module 92 and the second camera module 93 would emit invisible light toward the reflective frame 94, and capture the signal reflected by the reflective frame 94
Data Source
AI summary
An optical coordinate input device is disclosed. The optical coordinate input device includes a frame, a first touch detection area, a second touch detection area, a first detection module, a second detection module, and a processing module. The second touch detection area overlap the first touch detection area. The first detection module is disposed on the frame and adjacent to the second touch detection area for detecting the first touch detection area to generate a first touch coordinate signal. The second detection module is disposed on the frame and adjacent to the first touch detection area for detecting the second touch detection area to generate a second touch coordinate signal, wherein the first and second detection module are disposed on different surface of the frame. The processing is used for executing a coordinate calculation procedure base on the first and the second touch coordinate signal.