Touch Panel Test Method for Time Difference Parameter Optimization
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Solution Overview
Problem
Manufacturing process variations in touch systems, including touch panels and processing apparatus, lead to errors in electrode performance and analog front-end components, resulting in failures of touch sensitive functionality and costly recalls.
Innovation Solution
An integrated test method is developed to detect combinations of touch sensitive processing apparatus and touch panels, selecting the best parameter records for touch sensitive detection. This method involves testing with multiple candidate time difference values, determining qualified results based on normal and absolute ranges, and recording qualified results and corresponding time difference values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional touch sensitive processing is used without integrated detection, then manufacturing process variations cause errors in electrode performance and analog front-end components, but implementing recall processes to identify failed combinations increases costs dramatically
Solution Approach 1:
The patent implements preliminary detection during the manufacturing process by testing touch panel combinations with multiple candidate time difference values before final assembly. This preliminary action identifies qualified combinations early, preventing costly recalls later by ensuring only reliable touch-sensitive apparatus combinations are produced.
Solution Approach 2:
The patent changes the time difference parameter during testing by evaluating multiple candidate time difference values (first, second, third, etc. candidate values). This parameter variation allows the system to find optimal settings that compensate for manufacturing variations in electrodes and analog front-end components, improving reliability without increasing manufacturing cost.
2Measurement precision
If multiple candidate time difference values are tested to find best parameters, then detection accuracy improves, but testing time and process complexity increase
Solution Approach 1:
The patent applies partial action by testing multiple candidate time difference values but stopping as soon as a qualified combination is found. It does not require exhaustive testing of all possible parameters, achieving sufficient detection accuracy without unnecessary time consumption. The process balances precision with efficiency by performing just enough testing to ensure reliability.
3Reliability
If strict quality control is applied to reject combinations with errors, then product reliability improves, but manufacturing yield decreases and recall costs increase
Solution Approach 1:
The patent improves reliability while maintaining productivity by changing time difference parameters during testing. Instead of rejecting all combinations with manufacturing variations, it adjusts the time difference parameter to find qualified combinations that work correctly despite physical variations. This approach maintains high manufacturing yield while ensuring product reliability.
Data Source
AI summary
A test method for a combination of touch sensitive processing apparatus and touch panel. The test method is configured to find out whether a stored time difference value with regard to driving signals is appropriate for the combination. If not, the test method is further configured to test several candidate time difference values for finding out one or a best one, which can be stored in a non-firmware of a non-volatile memory as a parameter for further touch sensitive processing. When none of the candidate time difference values is appropriate, the combination is determined as disqualified.