Touch Sensing Device Electrode Defect Correction
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Solution Overview
Problem
The increasing proximity of electrodes in touch panels leads to higher manufacturing defects, such as short circuits and open failures, resulting in reduced touch sensitivity and increased panel disposal, especially when integrated with display panels, causing significant losses.
Innovation Solution
A touch sensing device that identifies defective electrodes and corrects their sensed values using adjacent electrodes' values, allowing for the reuse of panels by averaging or using B-spline/bicubic equations to generate corrected values, thereby minimizing quality deterioration and disposal costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between electrodes is shortened to achieve high-resolution panel, then the resolution is improved, but the probability of manufacturing defects (short circuit and open failure) increases
Solution Approach 1:
The patent applies preliminary action by identifying defective electrodes during the manufacturing process before the panel is shipped to customers. The defect identification unit detects short circuits and open failures in electrodes, and the correction unit pre-corrects the sensed values of defective electrodes using adjacent electrodes' data. This allows defective panels to be salvaged and reused, converting what would be waste into usable products.
2Reliability
If defective panels are discarded to maintain quality, then product reliability is preserved, but manufacturing loss and waste increase
Solution Approach 1:
The patent implements discarding and recovering by recovering value from panels that would otherwise be discarded due to electrode defects. The system identifies defective electrodes, corrects their sensed values using mathematical operations (averaging or B-spline equations) based on adjacent electrodes' data, and enables these panels to continue being used. This converts waste into usable products, significantly reducing manufacturing losses.
3Reliability
If defective panels are replaced during use, then touch sensitivity is maintained, but disposal costs and resource waste increase
Solution Approach 1:
The patent applies self-service by enabling the touch panel to automatically detect and correct its own defects without external intervention. The defect identification unit continuously monitors electrode status, and when a defective electrode is detected, the correction unit automatically corrects the sensed value using data from adjacent electrodes. This self-diagnosis and self-correction capability allows panels to maintain functionality throughout their lifecycle without replacement.
4Device complexity
If the sensed value of defective electrode is not corrected, then device complexity is reduced, but touch detection accuracy deteriorates
Solution Approach 1:
The patent uses an intermediary approach by introducing a correction unit that acts as a mediator between defective electrodes and the touch detection system. When a defective electrode is identified, the correction unit interpolates its sensed value using mathematical operations (averaging adjacent electrodes' values or applying B-spline equations) based on data from neighboring healthy electrodes. This intermediary correction process maintains touch detection accuracy without requiring complex hardware modifications.
Data Source
AI summary
One exemplary embodiment provides a touch sensing device including: a first processor configured to identify a defective sensed value that satisfies a defect determination condition among the first sensed values of a plurality of electrodes disposed on a panel in a state where there is no touch or proximity of an external object to the panel; a storage unit configured to store information indicating a defective electrode corresponding to the defective sensed value among the plurality of electrodes; and a second processor configured to correct a sensed value corresponding to the defective electrode among the second sensed values of the plurality of electrodes using the sensed value of at least one electrode adjacent to the defective electrode.