Flexible Display Crack Detection Circuit
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Solution Overview
Problem
The rapid development of AMOLED display technology faces challenges in yield improvement due to the formation of tiny cracks in flexible panels, which provide paths for water and oxygen, leading to material failure and reduced service life, especially when using Flexible Multi-Layer On Cell (FMLOC) technology that integrates screens and touch control.
Innovation Solution
A display panel design incorporating a crack detection circuit structure with first and second crack detection lines in different function layers, connected to detection switch circuits and data lines, allowing for independent crack detection and positioning, thereby improving detection efficiency and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Flexible Multi-Layer On Cell (FMLOC) technology is used to integrate screen and touch control, then the integration level of display device is improved, but cracks may occur in both substrate and FMLOC, providing paths for water and oxygen
Solution Approach 1:
The patent divides the crack detection function into separate detection lines for different layers (substrate layer and FMLOC layer). By segmenting the detection system, each layer can be independently monitored, allowing precise identification of which layer contains cracks without requiring a completely integrated detection approach.
2Measurement precision
If crack detection circuit structure is added to detect cracks in flexible panels, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines the crack detection circuit with the existing data line structure of the display panel. The detection lines are integrated into the peripheral region and share routing with data lines, merging detection functionality with existing circuitry rather than adding completely separate detection pathways.
Solution Approach 2:
The detection switch circuit serves multiple functions: it can detect cracks in different layers, control the connection state of detection lines, and work with both substrate and FMLOC layers. This multi-functional design reduces the need for separate dedicated circuits for each detection task.
3Productivity
If multiple detection lines are arranged in different function layers to detect crack positions, then detection efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent arranges detection lines in different vertical layers (substrate layer and FMLOC layer) rather than only in the same plane. This three-dimensional arrangement allows simultaneous detection of cracks in different layers, improving detection efficiency by adding a vertical dimension to the detection architecture.
Data Source
AI summary
A display panel, crack detection method therefor, and display device. The display panel comprises a display area (100) provided with at least one first data line (101) and at least one second data line (102), and peripheral area (200) surrounding the display area and provided with a first crack detection line, second crack detection line, first detection switch circuit (51), and second detection switch circuit (52); the first crack detection line and second crack detection line are in different functional layers; the first crack detection line has a first end (A) electrically connected to a first test end and a second end (C) electrically connected to first detection switch circuit; the second crack detection line has a first end (B1) electrically connected to a third node (B) that is different from the first end (A) and second end (C), and a second end (A1) electrically connected to second detection switch circuit.