Light-Emitting Substrate With Angled Extraction for Dense Pixel Conversion
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Solution Overview
Problem
Current light-emitting devices, such as OLEDs and quantum dot light-emitting diodes, face challenges in achieving high pixel density and efficient light conversion for high-resolution displays due to limitations in light extraction and wavelength conversion efficiency, particularly with the use of quantum dot light-emitting materials which require thick films and scattering particles to enhance luminous efficiency.
Innovation Solution
A light-emitting substrate design featuring a pixel layer with sub-pixels comprising a light-emitting element, a first light extraction layer, and two material layers where the light extraction layer deflects light into the material layers at a preset angle, allowing the light to propagate and be converted by light conversion materials within these layers, eliminating the need for scattering particles and enabling efficient light extraction and conversion without increasing film thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If quantum dot light-emitting materials are used to enhance luminous efficiency, then light conversion efficiency is improved, but film thickness must be increased and scattering particles are required
Solution Approach 1:
The patent transitions from a conventional single-layer quantum dot structure to a multi-layer stacked structure with alternating quantum dot layers and light extraction layers. This dimensional organization allows light to undergo multiple absorption and conversion cycles across different layers, enhancing luminous efficiency without requiring increased film thickness of individual quantum dot layers
Solution Approach 2:
The patent introduces light extraction layers as intermediary components between the quantum dot light-emitting elements and the external environment. These intermediate layers serve dual functions: extracting light from the high-refractive-index quantum dot layers and providing optical paths that enable repeated absorption-conversion cycles, thereby improving efficiency without thickening the quantum dot films
2Loss of energy
If scattering particles are added to quantum dot films to enhance luminous efficiency, then light conversion is improved, but device complexity increases
Solution Approach 1:
The patent extracts and separates the light extraction function from the quantum dot light-emitting layer by introducing dedicated light extraction layers. This separation eliminates the need for scattering particles within the quantum dot films, as the light extraction layers provide structured optical paths through their layered geometry and refractive index differences, thereby simplifying the quantum dot film composition while maintaining enhanced luminous efficiency
3Measurement precision
If high pixel density is achieved for high-resolution displays, then display resolution is improved, but light extraction efficiency deteriorates
Solution Approach 1:
The patent segments the light-emitting structure into multiple alternating layers (quantum dot layers and light extraction layers) within each sub-pixel. This segmentation creates multiple interfaces with different refractive indices that facilitate light extraction at each interface, compensating for the reduced extraction efficiency inherent in high pixel density configurations where sub-pixel dimensions are constrained
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
This design enhances light conversion efficiency and supports high pixel density displays by allowing repeated absorption and conversion of light within the material layers, simplifying manufacturing and reducing costs while maintaining high luminous efficacy.
Implementation Method 1
The first light extraction layer is configured to deflect the light emitted from the light-emitting element into the first material layer at a preset angle
Implementation Method 2
The first light conversion material is configured to absorb light propagating in the first material layer and the second material layer included in the first reference sub-pixel, and to convert the absorbed light into emergent light of a second color
Data Source
AI summary
A light-emitting substrate includes a pixel layer including a plurality of sub-pixels. Each sub-pixel includes a light-emitting element, a first light extraction layer, a first material layer, and a second material layer. The light-emitting element is configured to emit light of a first color. The first light extraction layer is configured to deflect the light emitted from the light-emitting element into the first material layer at a preset angle. The first material layer and the second material layer are configured to enable the light deflected at the preset angle to propagate in the first material layer and the second material layer. The plurality of sub-pixels include at least one first sub-pixel. Of a first material layer and a second material layer included in the at least one first sub-pixel, at least the second material layer includes a first light conversion material.