Optical Touch Positioning Without Side Bars Using Depth Sensors
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Solution Overview
Problem
Current optical touch systems require side bars for determining object positions, which increase costs and complexity and are prone to shedding or distortion, affecting accuracy.
Innovation Solution
An optical touch system utilizing a depth image sensor and a touch plane without side bars, where the depth image sensor provides angle and depth information to determine if an object is within or outside the touch plane, allowing for position determination using image information and processing circuit analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If side bars are used for determining object positions in optical touch systems, then position detection capability is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and removes the side bar components from the optical touch system. Instead of using side bars for position detection, the invention uses the existing touch plane surface itself, eliminating the need for separate side bar structures while maintaining position detection capability through optical sensors positioned at the corners of the touch plane.
Solution Approach 2:
The invention merges the position detection function directly into the touch plane surface. The touch plane serves dual purposes: as the touch interface and as the reference surface for position detection, eliminating the need for separate side bar components by integrating detection functionality into the main touch surface structure.
2Measurement precision
If side bars are used for determining object positions, then position detection is enabled, but manufacturing cost increases
Solution Approach 1:
The patent extracts and removes the side bar components from the optical touch system. Instead of using side bars for position detection, the invention uses the existing touch plane surface itself, eliminating the need for separate side bar structures while maintaining position detection capability through optical sensors positioned at the corners of the touch plane.
Solution Approach 2:
The invention replaces expensive side bar components with simpler, less costly corner-mounted optical sensors. By using the existing touch plane structure and positioning sensors at the corners, the system achieves position detection with lower-cost components, reducing overall manufacturing expenses.
3Measurement precision
If side bars are used for determining object positions, then position detection capability is achieved, but assembly complexity increases
Solution Approach 1:
The patent extracts and removes the side bar components from the optical touch system. Instead of using side bars for position detection, the invention uses the existing touch plane surface itself, eliminating the need for separate side bar structures while maintaining position detection capability through optical sensors positioned at the corners of the touch plane.
4Measurement precision
If side bars are used for determining object positions, then position detection is enabled, but reliability decreases due to shedding or distortion
Solution Approach 1:
The patent extracts and removes the side bar components from the optical touch system. Instead of using side bars for position detection, the invention uses the existing touch plane surface itself, eliminating the need for separate side bar structures while maintaining position detection capability through optical sensors positioned at the corners of the touch plane.
Solution Approach 2:
The invention uses the touch plane surface itself as the reference for position detection, rather than relying on separate side bar components. By detecting object positions relative to the touch plane boundaries through corner-mounted sensors, the system achieves reliable position determination without the shedding or distortion problems associated with physical side bars.
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 eliminates the need for side bars, reducing costs and assembly complexity while maintaining accurate object position detection, and preventing issues like shedding or distortion.
Implementation Method 1
when light emitted, reflections from side bars can be used to distribute light on entire touch screen
Data Source
AI summary
Methods for determining positions of objects for use in an optical touch system are provided. The optical touch system at least includes a depth image sensor and a touch plane, the depth image sensor having a sensing area covering the touch plane. First, when an object is detected by the depth image sensor, image information is obtained by using the depth image sensor, wherein the image information includes angle information and depth information related to the depth image sensor for the object. Thereafter, it is determined whether a position of the object is located at the inside or the outside of the touch plane according to the angle information and the depth information.