Infrared Sensor Auto Angle Setting for Touch Coordinate Accuracy
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Solution Overview
Problem
Infrared type touch screens face issues with coordinate determination errors due to deviations in the position of infrared sensors during transportation or fabrication, which cannot be corrected after shipment, leading to user inconvenience and unreliable compensation values for angular deviations.
Innovation Solution
A method for auto angle setting of infrared sensor modules, where peak detection and slope detection modes are used to set effective angles of view by identifying reference points and slope points on the sensor units, allowing for automatic touch detection without physical correction and accounting for sensor deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If infrared sensors are positioned outside the display module, then the touch screen enables interface interaction, but the sensor position is liable to deviate during transportation or fabrication, causing coordinate determination errors
Solution Approach 1:
The system performs self-calibration by automatically detecting the positions of infrared light sources and calculating correction values for sensor deviations, eliminating the need for manual physical correction and enabling the system to compensate for its own positioning errors
Solution Approach 2:
The system changes the effective angle of view parameters of the infrared sensors based on detected light source positions and calculated correction values, dynamically adjusting the sensing parameters to compensate for physical deviations in sensor placement
2Measurement precision
If manual correction of sensor deviation is performed before shipment, then coordinate determination accuracy is improved, but additional work and time are required, and correction is not possible after shipment
Solution Approach 1:
The system performs self-calibration automatically by detecting infrared light sources and calculating correction values, eliminating the need for manual physical correction and enabling the system to compensate for its own positioning errors
Solution Approach 2:
The system performs calibration automatically during initial use or before shipment, establishing correction values in advance that can be stored and applied, eliminating the need for repeated manual correction operations
3Measurement precision
If a look-up table compensation algorithm is used, then some deviation compensation is achieved, but the compensation is limited to initial state and particular region, failing to correct errors occurring during use
Solution Approach 1:
The system dynamically recalibrates the effective angle of view parameters based on real-time detection of infrared light source positions, allowing continuous adaptation to deviations that occur during transportation, fabrication, or use, rather than relying on static pre-programmed compensation values
Solution Approach 2:
The system detects the actual positions of infrared light sources, compares them with expected positions, calculates correction values based on the detected deviations, and applies these corrections to the effective angle of view parameters, creating a closed-loop feedback system that continuously maintains accuracy
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 method enables accurate touch detection by automatically setting effective angles of view, reducing the need for physical correction and eliminating errors caused by sensor deviations, thereby improving the reliability and efficiency of touch coordinate determination.
Implementation Method 1
sensing the light shielded at the time of the touch to calculate an angle to perceive the touch
Data Source
AI summary
The present invention relates to a method for auto angle setting of an infrared sensor module having a light emitting unit and a sensor unit arranged at least two corners of a display panel, includes the steps of selecting a peak detection mode or a slope detection mode; in the peak detection mode, setting a pixel of in the sensor unit which senses a light quantity as a reference point corresponding to a corner other infrared sensor module is arranged at; in the slope detection mode, analyzing the light quantities of a start pixel block and an end pixel block in the sensor unit and setting a pixel which forms a greatest slope as a start point or an end point; and setting an effective angle of view in the sensor unit with reference to the reference point, the start point, and the end point.