Out-cell Optical Touch Device Automatic Calibration
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Solution Overview
Problem
Conventional out-cell touch devices require manual calibration, which is prone to artificial errors due to inaccurate positioning, leading to deviations in touch coordinates and affecting the precision of touch control on display panels.
Innovation Solution
An out-cell optical touch device with at least one signal sensor and multiple position sensors that automatically calculates and applies linear and rotary offsets to transform touch coordinates into screen coordinates, eliminating the need for manual calibration points and reducing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manual calibration is used to transform coordinates, then the touch device can be installed on the display, but coordinate deviation occurs due to positioning inaccuracies
Solution Approach 1:
The system performs self-calibration by automatically detecting the display panel's dimensions and calculating transformation parameters without requiring manual intervention. The processor autonomously acquires calibration data from sensors and computes coordinate transformation formulas, eliminating human error in the calibration process.
Solution Approach 2:
The patent replaces manual mechanical calibration operations with an automated optical sensing and computational system. Position sensors and image processing algorithms substitute for manual measurement tools, automatically determining the relationship between touch coordinates and display coordinates through mathematical transformation.
2Ease of operation
If user manually touches calibration points, then coordinate transformation can be calculated, but artificial errors cause obvious deviation in transformed coordinates
Solution Approach 1:
The calibration process is fully automated through self-service mechanisms. The system automatically captures images of the display panel, extracts dimensional information through image processing, calculates transformation parameters, and applies coordinate transformation without requiring user interaction with calibration points.
Solution Approach 2:
The patent introduces an intermediary computational system that mediates between the touch input and display output. The processor acts as an intermediary that automatically processes calibration data, calculates transformation formulas, and applies coordinate conversion, eliminating the need for direct manual intervention and reducing human error.
3Measurement precision
If automatic coordinate amendment is implemented, then artificial errors are prevented, but the device requires multiple sensors and processing capabilities
Solution Approach 1:
The processor serves multiple functions: it controls the signal sensors, processes images from the display panel, calculates transformation parameters, and applies coordinate transformation. This multi-functionality reduces the need for separate dedicated components, managing system complexity while achieving automatic calibration.
Solution Approach 2:
The patent combines multiple functions into integrated components. The position sensors are integrated with the frame structure, and the calibration process merges image capture, dimensional analysis, and transformation calculation into a unified automated workflow, reducing overall system complexity despite enhanced capabilities.
Data Source
AI summary
A calibrating method applied to an out-cell optical touch device relative to a display panel is disclosed. The calibrating method is suitable for the out-cell optical touch device that includes at least one signal sensor and at least two position sensors. The position sensors are respectively disposed on two adjacent sides of a frame of the out-cell optical touch device. The calibrating method includes acquiring a first value according to dimensions of the display panel, detecting a distance between the frame and sides of the display panel to acquire a second value, utilizing the first value and the second value to obtain an offset, and transforming touch coordinates detected by the signal sensor into screen coordinates applied for the display panel according to the offset.