Pixel Electrode Layout for Uniform Light Emitting Element Alignment
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Solution Overview
Problem
Existing display devices face challenges in preventing light emitting elements from concentrating in the outer portions of the light emitting area and ensuring stable alignment between electrodes, which affects the utilization rate and light emitting characteristics of pixels.
Innovation Solution
A pixel design that includes a light emitting area with a central portion and an outer portion, surrounded by a non-light emitting area, with electrodes spaced apart at varying intervals to gradually increase from the central portion to the outer portion, preventing light emitting elements from concentrating in the outer portions and ensuring stable alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrodes are spaced at a constant interval in the light emitting area, then the structure is simple and easy to manufacture, but light emitting elements concentrate in the outer portions reducing utilization rate
Solution Approach 1:
The patent applies local quality by varying the interval between first and second electrodes across different regions of the light emitting area. Specifically, the interval is smaller in the central region and larger in the outer region, creating region-specific electrode spacing that optimizes light emitting element distribution. This non-uniform spacing prevents concentration in outer portions while maintaining manufacturability through a systematic gradient design.
2Reliability
If electrodes are spaced closer together to improve alignment stability, then alignment is more stable, but the light emitting area becomes constrained and reduces overall light output
Solution Approach 1:
The patent resolves this contradiction by implementing local quality through spatially varying electrode intervals. In the central region where alignment stability is critical, the electrode interval is kept small to ensure stable positioning of light emitting elements. In the outer region where alignment constraints are less critical, the interval is increased to expand the overall light emitting area and improve total light output. This region-specific approach optimizes both alignment stability and light emitting area simultaneously.
Data Source
AI summary
A pixel includes a light emitting area including a central portion and an outer portion, a non-light emitting area surrounding the light emitting area, a first electrode and a second electrode that are spaced apart from each other in the light emitting area, and a first light emitting element disposed between the first electrode and the second electrode. The first electrode and the second electrode are spaced apart from each other at a first interval in the central portion, and are spaced apart from each other at a second interval in the outer portion. The second interval is larger than the first interval. An interval between the first electrode and the second electrode gradually increases from the central portion to the outer portion.