Display Device Light-Emitting Structures Vertical Insulation
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Solution Overview
Problem
Display devices face limitations in reducing the size and area of non-emitting areas between adjacent light-emitting structures while maintaining sufficient insulation, which restricts the increase in resolution due to the need for a minimum horizontal distance between adjacent light-emitting structures.
Innovation Solution
The display device design includes light-emitting structures with a same thickness, an upper insulating layer covering the edges of lower electrodes, and an insulating layer between them, allowing for sufficient insulation even at short horizontal distances by varying the vertical positions of light-emitting structures and using reverse-tapered contact holes and over-coat layers to reduce the non-emitting area size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the horizontal distance between adjacent light-emitting structures is reduced to increase resolution, then the resolution is improved, but the insulation between lower electrodes becomes insufficient
Solution Approach 1:
The patent introduces a vertical dimension solution by forming the second light-emitting structure at a different vertical position than the first light-emitting structure. Specifically, the second lower electrode is positioned at a lower vertical position than the first lower electrode, creating vertical separation. This dimensional change allows the structures to be closer horizontally while maintaining adequate insulation through vertical positioning, thus resolving the contradiction between reducing horizontal distance for higher resolution and maintaining insulation reliability.
2Measurement precision
If the size and area of non-emitting areas are reduced to increase resolution, then the resolution is improved, but the insulation distance between light-emitting structures becomes insufficient
Solution Approach 1:
The patent resolves this contradiction by transitioning from a two-dimensional planar insulation approach to a three-dimensional spatial arrangement. By positioning the second light-emitting structure at a lower vertical position, the insulation is achieved through vertical separation rather than relying solely on horizontal distance. This allows the non-emitting area to be minimized while maintaining sufficient insulation through the vertical positioning strategy.
Solution Approach 2:
The patent applies local quality by creating different vertical positions for different light-emitting structures. The first light-emitting structure is positioned at a higher vertical position while the second is positioned at a lower vertical position. This localized variation in vertical positioning allows each structure to have optimal insulation characteristics specific to its position, enabling closer packing while maintaining adequate insulation distances.
Data Source
Figure 1~2
Figure 3~4
Figure 5A~5B
AI summary
A display device including emitting areas (BEA, REA, GEA, WEA) is provided. The emitting areas of the display device may realize a different color each other. The display device includes light-emitting structures (300B, 300R, 300G, 300W) on the emitting areas. The adjacent light-emitting structures have different heights with respect to the lower substrate, such that a size of a non-emitting area between the adjacent emitting areas is reduced.