Display Device Crack Detection Line Circuit Design
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Solution Overview
Problem
Display devices, such as LCDs and OLEDs, are prone to cracks in their substrates or layered structures due to impacts, which can lead to defects like non-emission or erroneous light emission of pixels, reducing reliability and causing signal line disconnections or increased resistance.
Innovation Solution
A display device with a crack detection line system that includes a first part on the substrate extending to a bending area and a second part surrounding a hole area, connected to a printed circuit board and transistors, allowing for inspection mode operation to detect cracks by applying specific voltage levels to the crack detection line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a crack detection line system is added to the display device, then crack detection capability is improved, but device complexity increases
Solution Approach 1:
The crack detection line is merged with the existing hole area structure and substrate, sharing the same physical space and manufacturing process. The detection line is formed as an integrated part of the display device structure rather than as a separate component, thereby improving crack detection capability while minimizing the increase in device complexity.
2Reliability
If the crack detection line extends to the bending area and peripheral area, then crack detection coverage is improved, but manufacturing precision requirements increase
Solution Approach 1:
The crack detection line is divided into multiple segments: a first part extending to the bending area and peripheral area, and a second part surrounding the hole area. These segments are connected to form a complete detection path. The segmentation allows each part to be optimized independently for its specific function while maintaining overall detection coverage, thereby improving crack detection coverage while managing manufacturing precision requirements.
3Measurement precision
If transistors are added to control the crack detection line voltage, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The transistors added to control the crack detection line voltage are designed to serve multiple functions: they control the voltage applied to the detection line for accurate crack detection, and they are integrated with the existing pixel circuit structure. This multi-functionality approach improves detection accuracy while minimizing the increase in overall device complexity by reusing existing circuit elements and structures.
Data Source
AI summary
A display device includes: a substrate including a display area, a peripheral area surrounding the display area, a hole area positioned inside the display area, and a pad area; a crack detection line including a first part in the pad area and extending to the peripheral area and a second part connected to the first part, disposed to surround the hole area, and extending to the pad area; a printed circuit board in the pad area; first transistors in the pad area and connected in series between the printed circuit board and the first part, where each of gate electrodes of the first transistors is connected to a first signal line; and second transistors in the pad area and connected in series between a constant voltage line and the first part, where each of gate electrodes of the second transistors is connected to a second signal line.