Display Panel Crack Detection Using Demultiplexer Multiplexing
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Solution Overview
Problem
The existing methods for manufacturing display panels often result in cracks at the edges, which affect the performance and require a crack detection module in the non-display area, increasing the burden on the non-display area and reducing the screen-to-body ratio.
Innovation Solution
A display panel design that includes a crack detection line and switch in the non-display area, using demultiplexers to detect cracks by comparing brightness differences in the display area, allowing for efficient crack detection without significantly increasing the non-display area's burden.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a crack detection module is provided in the non-display area, then crack detection capability is improved, but the area of the non-display area increases
Solution Approach 1:
The demultiplexer originally designed for signal distribution in the display panel is made to serve dual purposes: its original function plus crack detection function. By connecting the crack detection line to the demultiplexer's control terminal, the existing circuit structure performs both display signal routing and crack detection without requiring separate dedicated detection circuits, thereby avoiding increase in non-display area.
Solution Approach 2:
The crack detection functionality is merged with the existing demultiplexer circuit rather than being implemented as a separate module. The crack detection line is integrated into the signal path of the demultiplexer, and the detection switch is combined with the demultiplexer's control logic, allowing both functions to share the same physical space and circuit resources.
2Reliability
If a crack detection module is provided in the non-display area, then crack detection capability is improved, but the screen-to-body ratio decreases
Solution Approach 1:
The demultiplexer is designed to perform multiple functions including crack detection, eliminating the need for separate detection modules that would reduce the screen-to-body ratio. The crack detection line and switch are integrated into the existing signal distribution architecture.
Solution Approach 2:
The crack detection components are merged with the display panel's existing circuit structures, specifically utilizing the demultiplexer and its control terminals. This integration ensures that crack detection functionality is achieved without adding separate modules that would occupy display area and reduce the screen-to-body ratio.
3Reliability
If multiple crack detection switches are provided for multiple data lines, then detection coverage is improved, but device complexity increases
Solution Approach 1:
A single demultiplexer is made to control multiple data lines simultaneously for crack detection purposes. By utilizing the demultiplexer's ability to route signals to different outputs based on control inputs, one crack detection line can monitor multiple data lines through the demultiplexer's switching function, reducing the total number of detection components needed.
Solution Approach 2:
The detection function is segmented and distributed through the demultiplexer's multiple output channels. Instead of having separate detection circuits for each data line, the single crack detection line's signal is distributed to multiple data lines through the demultiplexer's switching action, achieving comprehensive coverage with minimal components.
Data Source
AI summary
A display panel, a method for detecting the same, and a display device are provided. The display panel has a display area provided with data lines therein, and a non-display area provided with fan-out lines, a crack detection line, multiplexers, a first crack detection switch, and a crack detection control signal line therein. The crack detection line includes first and second detection sub-lines connected to each other. The first detection sub-line and the second detection sub-line are respectively connected to an input terminal of the first crack detection switch and a crack detection signal terminal. An output terminal of the demultiplexer is electrically connected to n data lines. An input terminal of the first demultiplexer is connected to an output terminal of the first crack detection switch and one fan-out line, and a control terminal of the first crack detection switch is connected to the crack detection control signal line.