Curved Pixel Electrodes for Higher Light-Emitting Element Density
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Solution Overview
Problem
Existing display devices face challenges in maximizing the area occupancy and number of light-emitting elements per pixel, which affects the overall light emission efficiency.
Innovation Solution
The display apparatus features electrodes with curved side surfaces facing each other, arranged around the pixel's peripheral portion, increasing the ratio of electrode area per pixel and enhancing the number of light-emitting elements per unit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If electrodes are arranged in conventional straight configurations, then the electrode structure is simple and easy to manufacture, but the area occupancy and number of light-emitting elements per pixel are reduced
Solution Approach 1:
The patent applies curvature to the electrode side surfaces, transforming them from straight planar surfaces to curved surfaces with specific radii of curvature. This curvature allows the electrodes to better conform to the spherical arrangement of light-emitting elements, increasing the effective area occupancy and enabling more light-emitting elements to be accommodated within each pixel region while maintaining manufacturing feasibility through standardized curved profiles.
Solution Approach 2:
The patent introduces curvature in the radial dimension by specifying different radii of curvature for different portions of the electrode side surfaces. This dimensional change allows the electrodes to optimize their spatial arrangement around the light-emitting elements, maximizing area occupancy without significantly increasing structural complexity, as the curvature is applied systematically rather than arbitrarily.
2Productivity
If electrodes with curved side surfaces are used, then the area occupancy and light emission per unit area are increased, but the manufacturing precision requirements are higher
Solution Approach 1:
The patent specifies precise parameters for the curved side surfaces, including radii of curvature (e.g., first radius R1 and second radius R2 where R1 > R2) and angular ranges (e.g., 45° to 135°). By defining these parameters within specific ranges rather than requiring exact values, the patent achieves high light emission efficiency while providing manufacturing tolerance, thus balancing productivity improvement with manufacturability.
Solution Approach 2:
The patent applies different radii of curvature to different portions of the electrode side surfaces, with the first portion having a larger radius R1 and the second portion having a smaller radius R2. This local differentiation optimizes the light emission characteristics in different regions while distributing the manufacturing precision requirements across multiple standardized curved sections rather than requiring uniform high precision throughout.
3Productivity
If more light-emitting elements are packed per pixel, then the light emission efficiency is improved, but the electrode area per pixel is reduced
Solution Approach 1:
The curved side surfaces of the electrodes, with specifically controlled radii of curvature, enable the electrodes to more efficiently occupy the available space within each pixel. This curvature allows the electrodes to maintain adequate area while accommodating a higher density of light-emitting elements, as the curved geometry optimizes the spatial arrangement and reduces wasted space compared to straight electrode configurations.
Data Source
AI summary
A display apparatus includes: a substrate including a plurality of pixels; an electrode unit in each of the pixels of the substrate and including: a first electrode having a first outer side having a center of curvature and a curved shape; and a second electrode having a second outer side having a curved shape corresponding to the first outer side and spaced apart from and facing the first electrode; and a plurality of light-emitting elements between the first electrode and the second electrode. The center of curvature of the first electrode is on a peripheral portion of the pixel, and the first outer side of the first electrode faces a center of the pixel.