Second Substrate Refractive Index Gradient for Light Extraction
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Solution Overview
Problem
Current display devices face challenges in enhancing light extraction efficiency, particularly with the integration of light conversion layers that convert light into different wavelengths, which affects the overall image display quality.
Innovation Solution
A display device design featuring a first base substrate with pixels, a second base substrate overlapping the pixels, and a refractive index difference between two parts of the second base substrate, along with a black matrix and color filters, to improve light extraction efficiency by guiding and extracting light generated from light conversion layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light conversion layers are integrated to improve color purity, then color display quality is improved, but light extraction efficiency deteriorates
Solution Approach 1:
The patent applies local quality by creating a first part and a second part in the base substrate with different refractive indices. The first part (with higher refractive index) is positioned at specific locations to enhance light extraction, while the second part maintains the original substrate properties. This localized modification allows the system to improve light extraction efficiency in critical areas without altering the entire substrate, thereby resolving the contradiction between maintaining color purity and improving light extraction.
Solution Approach 2:
The patent changes the refractive index parameter of the base substrate by forming a first part with a different refractive index than the second part. This parameter change enables better light extraction from the light conversion layers by optimizing the optical properties at the interface, thus improving light extraction efficiency while preserving the color conversion function of the light conversion layers.
2Loss of energy
If the base substrate is modified to improve light extraction, then light extraction efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the base substrate into a first part and a second part with different refractive indices. This segmentation allows the complex optical function to be divided into distinct regions, making the manufacturing process more manageable. The first part can be formed using targeted techniques (such as laser processing or selective deposition) while the second part remains as the standard substrate material, thus reducing overall manufacturing complexity compared to modifying the entire substrate.
Solution Approach 2:
The first part of the base substrate acts as an intermediary element between the light conversion layers and the external environment. By introducing this intermediate layer with a specific refractive index, the patent facilitates light extraction without requiring complex modifications to either the light conversion layers or the entire substrate, thereby simplifying the overall manufacturing process.
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
The solution effectively enhances light extraction efficiency by guiding and extracting light from light conversion layers, improving the display quality by ensuring better light distribution and image clarity.
Implementation Method 1
the second base substrate includes a first part overlapping the non-pixel area; and a second part around the first part, wherein a refractive index of the first part is different from a refractive index of the second part
Data Source
AI summary
Provided is a display device including a first base substrate, a plurality of pixels disposed on the first base substrate and each of which including a pixel area and a non-pixel area around the pixel area, a second base substrate facing the first base substrate with the pixels therebetween, and a plurality of light conversion layers disposed under the second base substrate and overlapping the pixel areas of the pixels, wherein the second base substrate includes a first part overlapping the non-pixel area, and a second part around the first part, wherein a refractive index of the first part is different from a refractive index of the second part.