Display Device Touch Sensing for Non-Destructive Common-Electrode Inspection
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Solution Overview
Problem
Existing display devices lack a method to inspect the uniformity of the common electrode thickness without damaging the device.
Innovation Solution
A method is provided to inspect the common electrode thickness by inputting touch driving signals with different frequencies to first touch electrodes, converting touch sensing signals to the frequency domain, and analyzing peaks to determine the thickness, ensuring the common electrode is uniformly formed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional inspection methods are used to check common electrode thickness, then manufacturing defects can be detected, but the display device is damaged in the process
Solution Approach 1:
The patent replaces physical contact-based mechanical inspection methods with an electrical measurement method. By applying test voltages to touch electrodes and measuring capacitance values, the system detects common electrode thickness without physical contact or damage to the display device structure.
Solution Approach 2:
The patent introduces capacitance measurement as an intermediary parameter to indirectly assess common electrode thickness. Instead of directly measuring or physically contacting the electrode, the system uses capacitance values obtained through touch electrode interactions as a mediator to infer thickness uniformity.
2Ease of manufacture
If the common electrode thickness is not uniformly controlled, then manufacturing complexity is reduced, but display quality and performance deteriorate
Solution Approach 1:
The patent enables the display device to self-inspect its own quality by using its touch panel functionality to measure capacitance values that reflect common electrode thickness. This self-service inspection method allows manufacturers to verify thickness uniformity without requiring separate inspection equipment or processes.
Solution Approach 2:
The patent establishes a feedback mechanism where capacitance measurement results provide information about common electrode thickness uniformity. This feedback can be used to adjust manufacturing parameters or identify defective products, ensuring display quality while maintaining manufacturing 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
This method allows for non-destructive inspection of the common electrode thickness, ensuring uniformity and identifying potential defects without damaging the display device.
Implementation Method 1
converting at least one of the plurality of received touch sensing signals from a time domain to a frequency domain
Implementation Method 2
inputting touch driving signals having different frequencies to a plurality of first touch electrodes
Data Source
AI summary
A display device includes a touch panel and a display panel. The touch panel outputs touch sensing signals. At least one of a plurality of touch sensing signals is converted from a time domain to a frequency domain, and then information on a thickness of a common electrode is detected based on a peak of the converted touch sensing signal. As a result, it is possible to inspect whether the common electrode is formed with a uniform thickness without destroying the display device.