Micro LED Sealing Layer Geometry for Front Luminance Control
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Solution Overview
Problem
Micro LED display panels face challenges in achieving high front luminance and suppressing lateral light emission, which can degrade display quality.
Innovation Solution
Incorporating a sealing layer with an inclined surface that reflects light towards a light reflecting layer, enhancing front luminance by redirecting lateral light emission and suppressing mixing with adjacent elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional flat sealing layer is used, then the structure is simple, but front luminance is insufficient and lateral light emission cannot be suppressed
Solution Approach 1:
The sealing layer is designed with an inclined surface instead of a flat surface. This curvature change causes light that would otherwise emit laterally to be reflected toward the front direction, thereby increasing front luminance while maintaining a relatively simple single-layer structure
Solution Approach 2:
The inclined surface of the sealing layer converts harmful lateral light emission into beneficial front-directed light. By reflecting lateral light toward the front, the structure transforms what would be display-degrading lateral emission into contributing front luminance
2Illumination intensity
If the inclined surface extends too high, then front luminance increases, but the light emitting element height is insufficient to accommodate the structure
Solution Approach 1:
The patent specifies precise parameter ranges for the inclined surface: the upper end is positioned at 1/4 to 3/4 of the light emitting element height, and the lower end is positioned at 1/4 to 3/4 of the pixel electrode area extension. These parameter constraints optimize front luminance while ensuring adequate accommodation space
3Illumination intensity
If the upper end of the inclined surface is too close to the light emitting element, then light reflection efficiency increases, but manufacturing precision becomes difficult to achieve
Solution Approach 1:
The patent defines a practical positioning range for the upper end of the inclined surface at 1/4 to 3/4 of the light emitting element height. This range balances optical performance with manufacturing feasibility, avoiding both extreme closeness (which would improve reflection but hurt manufacturability) and excessive distance (which would improve ease of manufacture but reduce reflection efficiency)
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves front luminance and maintains display quality by effectively redirecting lateral light emission, resulting in enhanced display performance.
Implementation Method 1
an interface between the inclined surface and the coating layer being configured to reflect light traveling through the sealing layer toward the light reflecting layer
Data Source
AI summary
According to one embodiment, a display device includes an organic insulating layer, a light reflecting layer, a light emitting element, a sealing layer having an inclined surface having a lower end and an upper end, and a coating layer. An interface between the inclined surface and the coating layer is configured to reflect light traveling through the sealing layer toward the light reflecting layer. The lower end is located below a middle of the light emitting element in a height direction of the light emitting element. The upper end is located above the middle of the light emitting element in the height direction of the light emitting element.