Pixel Repair Pattern Layout for Misaligned Light-Emitting Elements
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Solution Overview
Problem
Display devices face issues with defective pixels where light emitting elements are misaligned, leading to reduced display quality and visible dark spots.
Innovation Solution
A display device with a substrate and electrodes, where a first pixel includes a first and second electrode, a light emitting element group, and repair patterns that reconfigure the current direction to align light emitting elements correctly, thereby repairing defective pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting elements are misaligned in a pixel, then manufacturing defects occur, but display quality deteriorates and dark spots appear
Solution Approach 1:
The patent changes the electrical connection parameters by introducing repair patterns that alter the current flow direction through the light emitting elements. By switching from a standard connection to a reversed connection configuration, the patent compensates for misaligned elements and restores proper light emission, thereby resolving the contradiction between manufacturing precision and display quality
Solution Approach 2:
The patent applies inversion by creating a repair pattern that reverses the electrical connection direction. When light emitting elements are misaligned, the repair pattern connects them in the opposite direction (first contact electrode to second electrode contact portion, and second contact electrode to first electrode contact portion), allowing current to flow correctly through misaligned elements and eliminate dark spots
2Reliability
If repair patterns are added to reconfigure current direction, then defective pixels are repaired, but device complexity increases
Solution Approach 1:
The patent introduces repair patterns as intermediary electrical connections that mediate between the contact electrodes and electrode contact portions. These intermediary patterns provide alternative current paths for defective pixels without disrupting the overall pixel structure, thereby restoring functionality while minimizing complexity increase
Solution Approach 2:
The repair patterns are applied locally only to defective pixels rather than uniformly across all pixels. This localized approach allows the patent to repair specific defective areas with additional connection patterns while leaving functional pixels unchanged, thus minimizing the overall increase in device complexity
Data Source
AI summary
A display device includes a first pixel disposed in a display area, wherein the first pixel includes first and second electrodes disposed in the display area and spaced apart from each other; a first light emitting element group including light emitting elements disposed between the first electrode and the second electrode; a first contact electrode disposed on the first electrode and connected to the light emitting elements; a second contact electrode disposed on the second electrode and connected to the light emitting elements; a first electrode contact portion disposed on the first electrode and connected to the first electrode; a second electrode contact portion disposed on the second electrode and connected to the second electrode; a first repair pattern connecting the second contact electrode and the first electrode contact portion; and a second repair pattern connecting the first contact electrode and the second electrode contact portion.