Pixel Electrode Layout With Bridge Connection for High-Resolution Displays
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Solution Overview
Problem
Existing display devices face challenges in achieving high resolution without increasing the number of alignment electrodes, which affects light output efficiency.
Innovation Solution
The introduction of an intermediate electrode (bridge electrode) between successive series stages in the pixel design, allowing for a series/parallel mixed structure without increasing the number of alignment electrodes, and utilizing insulating layers to connect contact electrodes across areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of alignment electrodes is increased to achieve high resolution, then resolution is improved, but device complexity and light output efficiency deteriorate
Solution Approach 1:
The pixel is divided into multiple emission units, each containing light emitting elements arranged in series stages. This segmentation allows high resolution to be achieved through the structured arrangement of fewer electrodes rather than increasing the total number of alignment electrodes across the entire display.
Solution Approach 2:
The patent introduces a third dimension (vertical stacking) by arranging light emitting elements in multiple series stages within each emission unit. This vertical arrangement enables high resolution without requiring proportionally more horizontal alignment electrodes, thus reducing overall electrode complexity.
2Manufacturing precision
If the number of alignment electrodes is increased to achieve high resolution, then resolution is improved, but light output efficiency deteriorates
Solution Approach 1:
By segmenting the pixel into multiple emission units with series-stage light emitting elements, the patent reduces the total number of alignment electrodes required. Fewer electrodes mean less light blocking and improved light output efficiency while maintaining high resolution through the segmented structure.
Solution Approach 2:
The patent applies different structural configurations to different parts of the pixel (multiple emission units with series stages) to optimize local light output efficiency. This local optimization allows high resolution to be achieved without the uniform increase in electrode density that would reduce overall light output efficiency.
3Reliability
If intermediate electrodes are added between series stages, then electrical connections are improved, but device complexity increases
Solution Approach 1:
The patent merges the intermediate electrode function into the existing electrode structure of each emission unit. Rather than adding completely separate intermediate electrodes, the design integrates connection functions into the series stage arrangement, improving electrical connections while minimizing additional structural complexity.
Solution Approach 2:
The electrodes in the series stages serve multiple functions: they act as both alignment electrodes for positioning light emitting elements and as intermediate connection electrodes for electrical connectivity between stages. This multi-functionality improves electrical connections without proportionally increasing device complexity.
Data Source
AI summary
According to an embodiment, a pixel may include a first area and a second area partitioned in a first direction, (1-1)-th and (2-1)-th electrodes disposed in the first area and spaced apart in a second direction different from the first direction, (1-2)-th and (2-2)-th electrodes disposed in the second area and spaced apart in the second direction, light emitting elements disposed between the (1-1)-th and (2-1)-th electrodes and between the (1-2)-th and (2-2)-th electrodes, a contact electrode disposed on the (1-1)-th and (2-1)-th electrodes and the (1-2)-th and (2-2)-th electrodes, an insulating layer disposed between each of the (1-1)-th and (2-1)-th electrodes and the (1-2)-th and (2-2)-th electrodes, and the contact electrode, and including a first opening exposing a portion of the (1-1)-th electrode; and a first intermediate electrode electrically connecting the contact electrode on the (2-1)-th electrode and the contact electrode on the (1-2)-th electrode.