Layered Refraction Pattern for Front-Luminance Display Optics
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Solution Overview
Problem
Light emitted from a light emitting diode in a display device disperses in multiple directions, reducing luminance in the front direction where the user is located.
Innovation Solution
A display device with a layered refraction pattern system comprising a first refraction pattern, a second refraction pattern made of inorganic material, and a third refraction pattern with a lower refractive index, designed to refract light towards the front direction, enhancing light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single refraction pattern is used, then the structure is simple, but light direction control is insufficient
Solution Approach 1:
The refraction pattern is divided into three distinct layers (first, second, and third refraction patterns) with different refractive indices, where each layer contributes to directing light in specific directions. This segmentation allows precise control of light propagation paths while maintaining reasonable structural complexity
Solution Approach 2:
Each refraction pattern layer is positioned at specific locations with tailored refractive indices: the first refraction pattern (n=1.6-1.7) is closest to the emission layer, the second refraction pattern (n>1.7) is in the middle, and the third refraction pattern (n=1.4-1.6) is on the outer side. This local differentiation of optical properties enables optimized light direction control at each interface
2Ease of manufacture
If the first refraction pattern is exposed to etching solution, then manufacturing is simplified, but chemical resistance deteriorates
Solution Approach 1:
The second refraction pattern is constructed from an inorganic material layer that serves as a protective barrier against etching solutions. This inorganic layer is combined with organic material layers (first and third refraction patterns) to create a composite structure that simultaneously provides chemical resistance and enables precise refractive index control for light direction management
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 layered refraction pattern system effectively directs light towards the front, improving luminance and maintaining the trapezoidal shape and chemical resistance of the first refraction pattern.
Implementation Method 1
a first refraction pattern disposed on the emission structure, a second refraction pattern disposed on the first refraction pattern and covering the first refraction pattern, where the second refraction pattern includes an inorganic material, and a third refraction pattern disposed on the second refraction pattern and having a refractive index less than a refractive index of the first refraction pattern
Data Source
AI summary
A display device includes a substrate, an emission structure disposed on the substrate, a first refraction pattern disposed on the emission structure, a second refraction pattern disposed on the first refraction pattern and covering the first refraction pattern, where the second refraction pattern includes an inorganic material, and a third refraction pattern disposed on the second refraction pattern and having a refractive index less than a refractive index of the first refraction pattern.