Touch Electrode Inspection Around Display Openings Using Capacitance Ratios
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Solution Overview
Problem
Existing methods for inspecting touch sensors in display apparatuses with openings are inadequate, particularly in determining the integrity of sensing electrodes around the opening areas.
Innovation Solution
A method involving determining a reference value for sensing electrodes, measuring mutual capacitances in different areas, calculating a ratio value, and comparing it to the reference to assess electrode defects, taking into account design areas and process distributions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If sensing electrodes are located around the opening area to expand display area, then the display area is expanded, but the inspection accuracy of electrode defects deteriorates
Solution Approach 1:
The patent applies local quality by determining different reference values for sensing electrodes based on their specific locations (first area vs. second area around the opening). This allows each electrode region to be inspected with location-appropriate reference values, resolving the contradiction by enabling accurate inspection of electrodes in the previously difficult-to-inspect opening area while maintaining display area expansion.
2Area of stationary object
If the area of sensing electrodes around the opening is reduced, then the display area is maximized, but the capacitance measurement reliability deteriorates
Solution Approach 1:
The patent changes the reference parameter (reference value) based on the electrode area and location. By adjusting the reference value according to the reduced area of electrodes around the opening, the system maintains reliable capacitance measurement comparison even when electrode areas are minimized to maximize display area.
3Device complexity
If existing inspection methods are used for electrodes around openings, then the inspection process is simple, but the defect detection accuracy deteriorates
Solution Approach 1:
The patent maintains inspection process simplicity while improving defect detection accuracy by introducing location-based reference values. The inspection process remains straightforward (measure capacitance, compare to reference), but the reference values are differentiated by electrode location, thereby improving accuracy without significantly increasing process complexity.
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
Effectively identifies defects in sensing electrodes by correlating capacitance ratios, ensuring reliable touch sensitivity in display apparatuses with openings.
Implementation Method 1
measuring a first capacitance corresponding to a mutual capacitance of a first sensing electrode located in a first area from among the sensing electrodes; measuring a second capacitance corresponding to a mutual capacitance of a second sensing electrode located in a second area from among the sensing electrodes
Data Source
AI summary
An inspection method of a display apparatus, includes: determining a reference value for sensing electrodes of the display apparatus; measuring a first capacitance corresponding to a mutual capacitance of a first sensing electrode located in a first area from among the sensing electrodes; measuring a second capacitance corresponding to a mutual capacitance of a second sensing electrode located in a second area from among the sensing electrodes; calculating a ratio value of the second capacitance to the first capacitance; and comparing the ratio value with the reference value to determine whether or not the sensing electrodes are defective.