Display Panel Pad Groups for Threshold Voltage Detection Accuracy
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Solution Overview
Problem
In high-resolution display panels, such as UHD displays, the close proximity of data lines leads to alignment issues during threshold voltage detection, reducing detection accuracy due to the need for numerous probes, which increases the likelihood of misalignment.
Innovation Solution
The display panel design includes M drive groups with N sub-pixels each, connected to N data detection terminals via data lines, and read lines that collect threshold voltages, reducing the need for direct probe connection to data lines and increasing the distance between detection terminals, thereby improving alignment and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of data lines is increased to support high-resolution display, then the display resolution is improved, but the distance between adjacent data lines decreases, making alignment during detection more difficult
Solution Approach 1:
The patent introduces pad groups as intermediary connection points between data lines and detection probes. Instead of directly probing each data line, the system uses pad groups that collect signals from multiple data lines, thereby increasing the effective distance between probe contact points and improving alignment accuracy during detection.
Solution Approach 2:
The patent merges multiple data line connections into single pad groups. Each pad group receives signals from multiple data lines and consolidates them into a single detection point, reducing the number of required probes and increasing the spacing between detection terminals, which improves alignment precision.
2Reliability
If the number of probes is increased to detect each data line individually, then the detection completeness is improved, but the likelihood of misalignment increases due to the dense arrangement of data lines
Solution Approach 1:
The patent combines multiple data line detection functions into single pad groups. Each pad group serves as a consolidated detection point that receives signals from multiple data lines, thereby reducing the total number of probes required while maintaining detection completeness. This merging approach increases the spacing between detection points and improves alignment accuracy.
Solution Approach 2:
The pad groups serve multiple functions: they act as signal collection points from multiple data lines, serve as detection terminals for probes, and provide a standardized interface for threshold voltage detection. This multi-functionality allows the system to maintain complete detection coverage while using fewer probes with better alignment characteristics.
Data Source
AI summary
A display panel includes M drive groups disposed side by side in a display area, and M pad groups disposed in a wiring area around the display area. Each pad group includes N data detection terminals. Each drive group includes a plurality of columns of pixel units, and each pixel unit includes N sub-pixels. N≥3, M≥2, and M and N are positive integers. Each data detection terminal is configured to receive a signal output from a detection device. The pad groups are in one-to-one correspondence with the drive groups. Sub-pixels having same color in a drive group of the drive groups are electrically connected to a data detection terminal of one of the pad groups corresponding to the drive group via a same one of data lines.