Touch Sensor Inspection Pad Segmentation for Display Panel Testing
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Solution Overview
Problem
Existing display panels with touch sensors face challenges in accurate inspection due to the need for applying a common voltage for touch sensor block inspection, which degrades pixel array image inspection accuracy and makes it difficult to determine open-short conditions in touch sensor blocks.
Innovation Solution
The display panel includes a touch inspection pad part that divides touch sensor blocks into odd-numbered and even-numbered blocks, applying different inspection voltages to each set, and an image inspection pad part that applies a common voltage to all touch sensor blocks for simultaneous inspection, ensuring accurate determination of open or short conditions and enhancing image inspection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common voltage is applied to all touch sensor blocks for open-short inspection, then the touch sensor inspection can be performed, but the image inspection accuracy of pixel arrays is degraded
Solution Approach 1:
The touch sensor blocks are divided into odd-numbered blocks and even-numbered blocks. The touch inspection pad part applies different inspection voltages to odd-numbered blocks while the even-numbered blocks maintain common voltage, enabling separate inspection of touch sensor blocks without affecting overall image inspection accuracy.
Solution Approach 2:
Different voltage conditions are applied to different regions: odd-numbered touch sensor blocks receive inspection voltages for open-short detection, while even-numbered blocks maintain common voltage for image display. This local differentiation allows simultaneous optimization of both touch sensor inspection and image inspection accuracy.
2Reliability
If different voltage values are applied to each common electrode for touch sensor inspection, then open-short conditions can be determined, but the accuracy of image inspection of pixels is degraded
Solution Approach 1:
The common electrodes are segmented into two groups: odd-numbered common electrodes connected to the touch inspection pad part for applying inspection voltages, and even-numbered common electrodes connected to the image inspection pad part for maintaining common voltage. This segmentation enables simultaneous open-short detection and accurate image inspection.
Solution Approach 2:
The touch inspection pad part acts as an intermediary that applies inspection voltages to odd-numbered common electrodes through inspection lines, while the image inspection pad part serves as another intermediary that maintains common voltage to even-numbered common electrodes. These intermediaries enable independent voltage control for different inspection purposes.
3Device complexity
If a related art lighting inspection method is used for pixel arrays, then the inspection process can be simplified, but it is not appropriate for inspecting touch sensor blocks with common voltage application
Solution Approach 1:
The inspection system is designed with multi-functionality: the touch inspection pad part handles open-short inspection of touch sensor blocks by applying inspection voltages to odd-numbered blocks, while the image inspection pad part handles image quality inspection by maintaining common voltage to even-numbered blocks. This universal design allows a single inspection system to perform multiple inspection functions appropriately.
Data Source
AI summary
A display panel having a touch sensor includes a pixel array, touch sensor blocks, a touch inspection pad unit, and an image inspection pad unit. In the pixel array, a plurality of pixels is disposed in a matrix form. The touch sensor blocks are connected to respective pluralities of the pixels in the pixel array. The touch inspection pad unit divides the touch sensor blocks into odd-numbered touch sensor blocks and even-numbered touch sensor blocks and a first touch inspection pad is coupled to the odd-numbered touch sensor blocks, while a second touch inspection pad is coupled to the odd-numbered touch sensor blocks. The image inspection pad part is commonly coupled to the odd-numbered touch sensor blocks and the even-numbered touch sensor blocks.