Optical Touch Display Calibration Using Coordinate Transformation
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Solution Overview
Problem
Large optical touch displays require extensive calibration, increasing time and labor, making mass production less economical due to the need for numerous calibration points for accurate detection.
Innovation Solution
A calibration method and apparatus that generate fewer representative calibration points, using image detecting sensors and a processor to transform image positions into screen positions, reducing the number of calibration steps and time through a coordinate transformation mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If more calibration points are used to ensure detection accuracy, then measurement precision is improved, but calibration time and labor increase
Solution Approach 1:
The patent segments the calibration process into two distinct phases: a first calibration phase that establishes a coordinate transformation mechanism using initial calibration points, and a second calibration phase that uses this mechanism to rapidly determine positions of additional calibration points. This segmentation allows the system to achieve high detection accuracy through the transformation mechanism while significantly reducing overall calibration time compared to traditional methods that treat all calibration points equally.
Solution Approach 2:
The patent performs preliminary calibration actions by establishing the coordinate transformation mechanism before processing all calibration points. The first calibration phase performs preliminary work to create the transformation framework, which then enables rapid processing of remaining calibration points without requiring the same level of detailed calibration for each point, thereby reducing total calibration time while maintaining accuracy.
2Measurement precision
If more calibration points are used to ensure detection accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the calibration process into two distinct phases with different levels of complexity. The first phase establishes a coordinate transformation mechanism that handles the complex mathematical relationships, while the second phase uses this pre-established mechanism to simplify subsequent calibration point processing. This segmentation reduces the apparent complexity of individual calibration steps while maintaining overall detection accuracy.
Solution Approach 2:
The coordinate transformation mechanism acts as an intermediary between the image coordinate system and the display coordinate system. This intermediary structure simplifies the calibration process by providing a standardized transformation framework that handles the complex coordinate relationships once, allowing subsequent calibration points to be processed more simply through this established mechanism, thereby reducing overall device complexity.
3Manufacturing precision
If more calibration points are used to ensure detection accuracy, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
The patent segments calibration into a first phase that establishes a coordinate transformation mechanism and a second phase that rapidly processes additional calibration points using this mechanism. This segmentation enables high manufacturing precision through the transformation framework while significantly improving productivity by reducing the time and resources required for complete calibration, making the process suitable for mass production.
Solution Approach 2:
The first calibration phase performs preliminary actions to establish the coordinate transformation mechanism, which then enables rapid processing of subsequent calibration points. This preliminary setup work, though requiring initial time investment, dramatically improves overall productivity by allowing faster processing of remaining calibration points, thereby balancing manufacturing precision with mass production efficiency.
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
The method significantly reduces calibration time and steps, enhancing the economical production of optical touch displays by maintaining detection accuracy with fewer calibration points.
Implementation Method 1
obtaining a first image position of each representative calibration point relative to the plurality of image detecting sensors via the plurality of image detecting sensors
Data Source
AI summary
An optical touch display, a calibration apparatus, and a calibration method thereof are disclosed. The calibration method is used for calibrating the optical touch display, and the optical touch display has a plurality of image detecting sensors. The calibration method includes the following steps: generating a plurality of calibration points; generating a plurality of representative calibration points from the plurality of calibration points; obtaining a first image position of each representative calibration point via the plurality of image detecting sensors; constructing a coordinate transformation mechanism for transforming the first image position into a first screen position; calculating a relative position between the representative calibration points and its neighboring calibration points; calculating a second image position of each calibration point based on the relative position; and calculating a second screen position by using the transformation mechanism and the second image position.