In-cell Touch Display Testing Pads and Switches
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Solution Overview
Problem
In in-cell touch display devices, detecting shorted or open touch electrodes is challenging, affecting the touch function, as existing methods lack effective solutions for identifying such issues.
Innovation Solution
The implementation of testing pads in the non-display area to determine whether touch electrodes are shorted or open, utilizing switches and voltage control to test the electrodes through specific voltage applications and image comparisons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If testing pads and switches are added to detect touch electrode abnormalities, then the detection capability is improved, but the device complexity increases
Solution Approach 1:
The display area is divided into a display region and a non-display area. Testing pads and switches are segregated into the non-display area, separating the detection function from the display function. This segmentation allows detection components to be added without interfering with the display area, thus improving detection capability while minimizing impact on device structure.
Solution Approach 2:
Switches are introduced as intermediary components between the testing pads and the touch electrodes. These switches act as controllable connectors that can isolate or connect testing components to specific touch electrodes or sensing lines, enabling precise detection while managing the complexity of connections through controlled intermediary elements.
2Measurement precision
If testing components are disposed in the non-display area, then the detection function is improved, but the available area for other components is reduced
Solution Approach 1:
Testing pads and detection components are extracted from the display area and placed in the non-display area. This extraction removes the detection function from the constrained display region, allowing testing components to be accommodated in the otherwise unused non-display area, thus improving detection capability without encroaching on the display area.
Solution Approach 2:
The layout transitions from utilizing only the display area to utilizing both display and non-display areas. By extending the functional layout into the non-display area dimension, the patent creates additional space for testing components without reducing the display area, effectively adding detection capability while preserving display real estate.
Data Source
AI summary
A in-cell touch display device includes first sensing lines, second sensing lines, first touch electrodes electrically connected to the first sensing lines respectively, second touch electrodes electrically connected to the second sensing lines respectively, first and second switches, and first and second touch testing pads. The first and second switches are disposed in a non-display area, in which the first switches have first terminals electrically connected to the first sensing lines, control terminals electrically connected to each other, and second terminals electrically connected to each other. The second switches have first terminals electrically connected to the second sensing lines, control terminals electrically connected to each other, and second terminals electrically connected to each other. The first touch testing pad is electrically connected to the second terminals of the first switches. The second touch testing pad is electrically connected to the second terminals of the second switches.