Display Device Dummy Pixel Repair Mechanism
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Solution Overview
Problem
Defective pixels in display devices can lead to low display quality and high manufacturing costs due to their visibility as bright or dark spots, affecting the entire display even if only some pixels are defective.
Innovation Solution
A display device design that incorporates dummy pixels to repair and detect defective pixels, using a matrix arrangement of active and dummy pixels with repair lines and switching elements to connect dummy pixels to active pixels, allowing for improved display quality and easy defect detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dummy pixels are added to repair defective pixels, then display quality is improved, but device complexity increases
Solution Approach 1:
Dummy pixels serve as intermediary elements that can be selectively activated to replace defective active pixels. The repair lines act as mediators connecting dummy pixels to active pixel locations, enabling defect compensation without permanently altering the display structure. This intermediary approach allows the system to maintain high display quality while managing complexity through controlled activation rather than permanent structural changes.
Solution Approach 2:
The patent applies local quality by making only the necessary portions of the display structure different from the standard active pixel array. Dummy pixels are positioned in non-display areas and selectively connected to specific defective active pixels through repair lines. This localized modification approach improves display quality at defective locations without requiring comprehensive structural changes across the entire display device, thereby limiting the increase in overall device complexity.
2Ease of repair
If repair lines and switching elements are added to connect dummy pixels to active pixels, then defective pixels can be repaired, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements preliminary action by pre-positioning dummy pixels in the non-display area and establishing repair line pathways before final assembly. The switching elements are pre-configured to control connections between dummy pixels and active pixels. This preliminary arrangement allows for easier post-manufacturing repair operations while the manufacturing process itself follows standard procedures, thereby reducing the burden on manufacturing precision while maintaining ease of repair capability.
3Reliability
If dummy pixels are used to replace defective pixels, then display quality improves, but the ability to detect remaining defects becomes more difficult
Solution Approach 1:
The patent employs color changes as a detection mechanism by applying different voltage levels to dummy pixels versus active pixels. Dummy pixels can be driven to display distinct colors or brightness levels that differ from active pixels, creating visual contrast that makes them easily identifiable. This color/brightness differentiation allows inspection systems to distinguish between repaired and original pixels, maintaining the ability to detect remaining defects while improving overall display quality through pixel replacement.
Data Source
AI summary
A display device is disclosed. In one aspect, the display device includes a display panel including a display area and a non-display area surrounding the display area. The display device also includes a plurality of active pixels formed in the display area extending in first and second directions as a matrix, a plurality of dummy pixels formed in the non-display area and extending in the second direction, a repair test line and one or more active pixel test lines formed in the non-display area and extending in the first direction, a plurality of scan lines electrically connected to the active pixels and the dummy pixels and extending in the first direction, a plurality of data lines electrically connected to the active pixels and extending in the second direction, and at least one dummy data line electrically connected to the dummy pixels and extending in the second direction.