Display Panel Crack Detection Circuit Design
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Solution Overview
Problem
Current display technologies, particularly flexible AMOLEDs, face challenges in detecting cracks within the display panel, which can affect the integrity and functionality of wearable devices due to the lack of effective crack detection methods.
Innovation Solution
A display panel design incorporating a detection circuit with detection signal lines, control signal lines, and switches that transmit detection signals along the edges of the active area, allowing for crack detection by analyzing signal transmission and light emission patterns, enabling the identification of cracks through brightness or image recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a detection circuit is added to the display panel, then crack detection capability is improved, but device complexity increases
Solution Approach 1:
The detection signal line is designed to serve dual purposes: it functions as a data line during normal display operation and as a crack detection signal line when detection is needed. This multi-functionality allows the system to perform crack detection without adding dedicated detection wiring, thereby improving reliability while minimizing the increase in device complexity.
Solution Approach 2:
The display panel uses its own existing data lines and switching circuits to perform self-diagnosis for crack detection. By reusing the built-in data transmission infrastructure for detection purposes, the system achieves crack detection capability without requiring external detection equipment or completely separate detection circuits, thus resolving the contradiction between improved reliability and increased complexity.
2Reliability
If detection signal lines are routed along the edge of the active area, then crack detection coverage is improved, but manufacturing precision requirements increase
Solution Approach 1:
The detection signal line is segmented into multiple sections, with each segment controlled by a corresponding switching circuit. This segmentation allows the detection signal to be selectively activated in different regions of the display panel, improving crack detection coverage while reducing the overall precision requirements for continuous signal line routing, as each segment can be independently managed and tested.
Data Source
AI summary
A display panel includes a plurality of sub-pixels and a plurality of data lines, and a detection circuit. The data lines include at least one first data line. The detection circuit includes a first detection signal line, a detection control signal line, and at least one first switch. The first detection signal line and the detection control signal line detour along an edge of the active area. The first detection signal line is configured to transmit a detection signal, and the detection control signal line is configured to transmit a detection control signal. The first switch is electrically connected to the first detection signal line, the detection control signal line, and the at least one first data line, and is configured to close a line between the first detection signal line and the first data line, in response to the detection control signal.