Pixel Electrode Layout for Lower Off Failures and Higher Light Output
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Solution Overview
Problem
Existing display devices face challenges in minimizing off failures and enhancing light output efficiency of light emitting elements.
Innovation Solution
A pixel design with a specific arrangement of electrodes and conductive patterns, along with a serial-parallel combination structure of light emitting elements, is proposed to address off failures and improve light output efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light emitting elements are arranged in a simple grid pattern with uniform electrodes, then device complexity is reduced, but off failures increase and light output efficiency decreases
Solution Approach 1:
The pixel is divided into first and second areas with distinct electrode arrangements. The first area contains electrodes (1-1 to 4-1) arranged in a first direction, while the second area contains electrodes (1-2 to 4-2) arranged in a second direction. This segmentation allows different regions to have optimized electrode configurations that reduce off failures while maintaining manageable device complexity through systematic organization.
Solution Approach 2:
Different electrode arrangements are applied to different local areas of the pixel. The first area uses a first directional arrangement while the second area uses a second directional arrangement. This local quality approach optimizes light output efficiency in each area by tailoring the electrode configuration to specific performance requirements, thereby reducing off failures without requiring complete redesign of the entire device.
2Reliability
If light emitting elements are connected in series only, then device complexity is minimized, but light output efficiency and reliability decrease
Solution Approach 1:
The patent combines series and parallel connection structures to form a hybrid configuration. Light emitting elements within each area are connected in series, while areas are connected in parallel through conductive patterns. This merging of connection approaches enhances reliability by providing multiple current paths, reducing the impact of individual element failures, while maintaining reasonable device complexity through systematic integration.
Solution Approach 2:
The connection structure provides dynamic current distribution capabilities. When certain light emitting elements fail, the conductive patterns enable current to dynamically reroute through alternative paths in parallel-connected areas. This dynamic adaptability improves pixel failure resistance without requiring complex active control mechanisms, achieving enhanced reliability with moderate structural complexity.
Data Source
AI summary
A pixel may include first and second areas sectioned from each other in a first direction; 1-1-th to 4-1-th electrodes successively arranged in the first area in a second direction intersecting the first direction; 1-2-th to 4-2-th electrodes successively arranged in the second area in the second direction; light emitting elements disposed between two adjacent electrodes of the 1-1-th to 4-1-th electrodes of the first area; light emitting elements disposed between two adjacent electrodes of the 1-2-th to 4-2-th electrodes of the second area; a first conductive pattern disposed in the first area, and electrically connecting the 2-1-th and 3-1-th electrodes; a second conductive pattern disposed over the first and second areas, and electrically connecting the 4-1-th electrode of the first area with the 1-2-th electrode of the second area; and a third conductive pattern disposed in the second area and electrically connecting the 2-2-th and 3-2-th electrodes.