Multi-Layer Refraction Pattern for Front-Luminance Displays
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Solution Overview
Problem
The challenge in display devices is that light emitted from the emission layer disperses in multiple directions, including the side direction, leading to reduced luminance in the front direction where the user is positioned.
Innovation Solution
A multi-layer refraction pattern structure comprising a first refraction pattern with a specific refractive index, a second refraction pattern made of inorganic material with a higher refractive index, and a third refraction pattern with a lower refractive index, strategically arranged to refract and reflect light towards the front direction, enhancing light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single refraction pattern is used to direct light, then light direction control is achieved, but light efficiency and luminance in the front direction are insufficient
Solution Approach 1:
The refraction pattern is divided into three distinct layers (first, second, and third refraction patterns) with different refractive indices. Each layer performs a specific function in the light redirection process, collectively improving front-direction luminance while minimizing light loss.
Solution Approach 2:
The invention uses a composite structure of multiple refraction patterns made from different materials with varying refractive indices. This composite approach enables more effective light manipulation compared to a single-material refraction pattern, enhancing both luminance and light efficiency.
2Ease of manufacture
If the first refraction pattern is exposed to chemical solutions during manufacturing, then subsequent layers can be formed, but the first refraction pattern loses its chemical resistance and shape
Solution Approach 1:
The second refraction pattern acts as a protective intermediary layer between the first refraction pattern and the chemical solutions used during manufacturing. This intermediate layer shields the first refraction pattern from chemical damage while allowing the manufacturing process to proceed.
Solution Approach 2:
The second refraction pattern is applied in advance to protect the first refraction pattern before it is exposed to harsh chemical environments during subsequent manufacturing steps. This pre-protection ensures the first refraction pattern maintains its shape and chemical resistance.
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 multi-layer refraction pattern structure effectively directs light towards the front, improving luminance and light efficiency by 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.