Pixel Electrode Repair Pattern for Defective Display Pixels
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Solution Overview
Problem
Existing display devices, particularly those that are miniaturized, lightweight, and low in power consumption, face challenges in repairing defects that occur during manufacturing, which can lead to issues like bright spots and dark spots due to defective pixels.
Innovation Solution
A display device design that includes a substrate with adjacent pixel areas, each equipped with a pixel electrode and a repair pattern made of a metal material. The repair pattern electrically connects the pixel electrodes, allowing for the repair of defective pixels by cutting a portion of the electrode and applying an additional data voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If display devices are miniaturized and integrated, then device performance and portability are improved, but repairability deteriorates due to limited space and complex structure
Solution Approach 1:
The pixel electrode is divided into multiple independent regions (first pixel electrode region, second pixel electrode region, third pixel electrode region) that can be independently repaired. The repair pattern is segmented into multiple contact regions (first contact region, second contact region, third contact region) that can be individually accessed and modified without affecting the entire pixel structure.
Solution Approach 2:
The repair pattern extends in multiple spatial dimensions (first direction and second direction) to provide multiple access paths to the pixel electrode. This multi-dimensional arrangement allows repair operations to be performed from different directions, overcoming the space constraints of miniaturized devices.
2Reliability
If repair patterns are added to enable defect repair, then reliability is improved, but device complexity increases
Solution Approach 1:
The repair pattern serves multiple functions: it provides electrical connection between different pixel electrode regions, enables repair of various types of defects (bright spots, dark spots, missing pixels), and maintains compatibility with the existing pixel structure. The same repair pattern design can be applied to different pixel types and defect scenarios.
Solution Approach 2:
The repair pattern is merged with the existing pixel electrode structure and data line layout. The first, second, and third contact regions are integrated into the overall pixel design, sharing space and electrical pathways with the functional pixel components, thereby minimizing additional complexity.
3Reliability
If pixel electrodes are cut to repair defects, then defective pixels are fixed, but electrical connection is interrupted
Solution Approach 1:
The repair pattern acts as an intermediary conductor that bridges the gap created by cutting the pixel electrode. The first contact region, second contact region, and third contact region are positioned to make electrical contact with the separated electrode segments, restoring the electrical pathway without requiring the original continuous electrode structure.
Solution Approach 2:
The repair pattern is designed and positioned in advance during the manufacturing process, with contact regions pre-configured to align with potential defect locations. This preliminary arrangement ensures that when defects occur, the electrical connection can be restored through simple contact establishment rather than complex post-manufacturing modifications.
Data Source
AI summary
A display device includes: a substrate including a first pixel area and a second pixel area adjacent to each other along a first direction; a first pixel in the first pixel area on the substrate and including a first pixel electrode; a second pixel in the second pixel area on the substrate and including a second pixel electrode; and a repair pattern on the first pixel electrode and the second pixel electrode, contacting with the first pixel electrode and the second pixel electrode, and electrically connecting the first pixel and the second pixel.