Display Panel Crack Detection Circuit Wiring Space Reduction
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Solution Overview
Problem
Existing display panels face challenges with large wiring space occupied by test circuits, which hinders narrow bezel design and results in poor detection effectiveness for cracks.
Innovation Solution
The display panel incorporates a crack detection circuit and a lighting test circuit, with separate control signals to manage their operations. This configuration allows for shared crack detection circuits across different stages, reducing wiring space and enabling independent operation of the crack detection and lighting test modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a test circuit is provided in the display panel, then detection function is achieved, but wiring space is occupied which hinders narrow bezel design
Solution Approach 1:
The patent merges the crack detection circuit and lighting test circuit into a single integrated test circuit structure. The crack detection line and lighting test signal line share common wiring paths and control logic, allowing both detection functions to coexist without requiring separate dedicated circuits. This integration significantly reduces the total wiring space occupied while maintaining both detection capabilities.
Solution Approach 2:
The test circuit is designed with multi-functionality to perform both crack detection and lighting test operations. By using the same circuit infrastructure and signal lines for multiple purposes, the patent eliminates the need for separate dedicated circuits for each function, thereby reducing overall wiring space and enabling narrower bezel design.
2Reliability
If crack detection line is always connected to data lines, then crack detection is enabled, but lighting test accuracy deteriorates due to interference
Solution Approach 1:
The patent implements dynamic switching of the crack detection line connection state through control signals. During lighting test operations, the crack detection line is dynamically disconnected from the data lines to eliminate interference. During crack detection operations, the connection is restored. This dynamic reconfiguration allows the system to optimize for the current operational mode, ensuring both crack detection capability and lighting test accuracy.
Solution Approach 2:
The system uses periodic control signals to switch between crack detection mode and lighting test mode. The crack detection line is periodically connected or disconnected based on the current test requirement. This periodic switching ensures that when lighting tests are performed, the crack detection line does not interfere with the measurement accuracy, while still maintaining crack detection functionality when needed.
Data Source
AI summary
A display panel and a test method thereof and a display device. The display panel includes a crack detection circuit, a crack detection line, a first test signal line, a first control signal line, a lighting test circuit, a second test signal line, and a second control signal line. In a crack detection mode, the crack detection circuit is turned on in response to a first control signal on the first control signal line, and the lighting test circuit is turned off in response to a second control signal on the second control signal line. In a lighting test mode, the crack detection circuit is turned off in response to the first control signal, the lighting test circuit is turned on in response to the second control signal, and a second test signal on the second test signal line is transmitted to a data line.