Stacked Light-Emitting Element Layers for High-Resolution Displays
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Solution Overview
Problem
Current light emitting devices have limited luminance and resolution due to the size of sub-pixels and the spacing between them, which restricts the number of subminiature light emitting elements that can be arranged in a unit area, making it difficult to achieve improved light quantity and high resolution.
Innovation Solution
A light emitting device with a multilayer structure is developed, featuring a substrate with stacked light emitting element layers, insulating layers, and electrodes, where each light emitting element is a rod-type diode emitting monochromatic or different colors of light, arranged in a three-dimensional configuration to increase luminance and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If subminiature light emitting elements are arranged in a unit area, then the number of elements increases, but the sub-pixel size and interval between elements limit the maximum number that can be arranged
Solution Approach 1:
The patent transitions from a two-dimensional arrangement of light emitting elements to a three-dimensional stacked structure with multiple layers. Each layer contains light emitting elements arranged in a grid pattern, and multiple layers are stacked vertically with insulating layers between them. This vertical stacking enables significantly more light emitting elements to be arranged within the same footprint area, directly resolving the limitation imposed by sub-pixel size and horizontal spacing.
2Illumination intensity
If the number of light emitting elements per unit area is increased, then luminance is improved, but the sub-pixel size and spacing restrict further increases
Solution Approach 1:
The patent divides the light emitting element array into multiple independent layers, where each layer contains a complete set of red, green, and blue light emitting elements. Each layer can be independently controlled and optimized, allowing the system to achieve high luminance through the cumulative effect of multiple layers while maintaining manageable complexity through modular design.
Solution Approach 2:
By stacking multiple layers vertically, the patent increases the total number of light emitting elements without increasing the horizontal footprint. This vertical dimension provides additional space for arranging elements, enabling higher luminance output while keeping each sub-pixel's horizontal dimensions compact and manageable.
3Measurement precision
If more light emitting elements are packed into a unit area, then resolution is improved, but the sub-pixel size and interval limit the packing density
Solution Approach 1:
The patent uses vertical stacking to increase the total number of light emitting elements within each sub-pixel without increasing the sub-pixel's horizontal dimensions. This allows more elements to contribute to the display resolution while maintaining compact sub-pixel sizes and appropriate spacing for electrical isolation and optical performance.
Data Source
AI summary
A light emitting device, a display device including a light emitting device, and a method of manufacturing a display device are provided. A light emitting device may include a substrate, and a plurality of light emitting element layers stacked on the substrate. Each of the light emitting element layers may include an insulating layer entirely disposed on the substrate, a first electrode and a second electrode disposed on the insulating layer and spaced apart from each other, and a plurality of light emitting elements disposed between the first electrode and the second electrode.