Pixel Electrode Insulating Pattern for Display Defect Repair
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Solution Overview
Problem
During the manufacturing process of display devices, lighting defects can occur in light emitting elements due to characteristic deterioration of driving thin film transistors or internal short circuits, leading to pixel areas with lighting defects that need to be repaired.
Innovation Solution
A display device is designed with a substrate, driving transistors, an insulating layer, and light emitting elements. The insulating layer includes contact holes and an insulating pattern that can be formed in these holes to prevent defective pixel areas from emitting light, and a repair line that connects the pixel electrode to the common voltage line to stabilize the electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lighting defects occur in light emitting elements due to characteristic deterioration of driving thin film transistors or internal short circuits, then pixel areas with lighting defects need to be repaired, but this increases manufacturing complexity and reduces productivity
Solution Approach 1:
The patent forms insulating patterns in contact holes during the manufacturing process before final assembly, enabling preventive repair of lighting defects. By preparing the insulating layer and contact hole structure in advance, the system allows for selective filling of defective pixels with insulating material to prevent light emission from defective areas, thereby maintaining high manufacturing efficiency while ensuring display quality
Solution Approach 2:
The patent extracts the problematic electrical connection in defective pixels by forming insulating patterns that block current flow in specific contact holes. This selective extraction of electrical connectivity from defective pixels prevents them from emitting light while leaving functional pixels unaffected, thus repairing lighting defects without requiring complete pixel replacement or complex rework
2Reliability
If insulating patterns are formed in contact holes to prevent defective pixels from emitting light, then lighting defect repair is achieved, but device structure becomes more complex
Solution Approach 1:
The patent applies local quality by forming insulating patterns selectively in specific contact holes corresponding to defective pixels, while leaving other contact holes unchanged. This localized modification approach allows the insulating layer structure to remain simple in functional areas while providing defect prevention only where needed, thus avoiding unnecessary complexity in the overall device structure
Solution Approach 2:
The patent implements partial action by filling only the necessary contact holes with insulating material rather than modifying the entire insulating layer structure. This selective approach applies the minimum required complexity to achieve lighting defect prevention, avoiding excessive structural modifications while maintaining reliability
Data Source
AI summary
A display device includes a substrate, driving transistors, an insulating layer, and light emitting elements. The driving transistors are disposed in pixel areas on the substrate and each includes a first electrode and a second electrode. The insulating layer is disposed over the driving transistors to cover the first electrodes and the second electrodes of the driving transistors and has contact holes respectively overlapping with the first electrodes of the driving transistors. The light emitting elements are disposed on the insulating layer and include pixel electrodes respectively overlapping with the first electrodes of the driving transistors. In addition, an insulating pattern is disposed in at least one of the contact holes to prevent a corresponding pixel area from emitting light.