Display Device High Refractive Index Microlens Front Luminance
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Solution Overview
Problem
Display devices with light emitting elements face reduced luminance in the front direction due to light being directed in multiple directions, including side directions, which lowers the visible image quality.
Innovation Solution
Incorporating a high refractive index member with a concave pattern and a low refractive index member with a convex pattern on the light emitting layer or color filter, where the concave and convex patterns refract light to direct it towards the normal viewing direction, enhancing light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are used to display images, then light is generated and emitted in multiple directions including front and side directions, but luminance in the front direction is reduced
Solution Approach 1:
The patent applies local quality by creating spatial variations in refractive index within the display device. Specifically, it uses a high refractive index layer with microlens patterns (different local refractive properties) embedded in a low refractive index encapsulant material. This local differentiation of optical properties enables selective redirection of light rays traveling in side directions toward the front viewing direction, thereby improving front luminance without significantly increasing overall energy consumption.
Solution Approach 2:
The patent utilizes parameter changes by varying the refractive index parameter across different layers and regions. The high refractive index layer (n>1.5) with microlens patterns is positioned between the light emitting element and the front surface, while the encapsulant material has a lower refractive index (n<1.5). This parameter variation enables controlled refraction of light rays, redirecting them toward the front direction to enhance luminance while maintaining energy efficiency.
2Illumination intensity
If high refractive index member with concave pattern and low refractive index member with convex pattern are added, then light is directed towards normal viewing direction, but device structure becomes more complex
Solution Approach 1:
The patent merges multiple functions into a single integrated optical structure. The high refractive index layer simultaneously serves as both the optical element for light redirection and part of the encapsulation structure. The microlens patterns are formed directly within this layer, combining the encapsulation function with the light guiding function. This merging approach reduces the number of separate components and simplifies the overall device structure while achieving the desired light direction control.
Solution Approach 2:
The high refractive index layer with microlens patterns performs multiple functions: it acts as an encapsulation layer protecting the light emitting element, serves as an optical element for redirecting light rays through refraction, and provides structural support. This multi-functionality reduces the need for additional separate components, thereby managing device complexity while achieving improved front luminance.
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 configuration improves light efficiency by directing more light towards the front of the display device, thereby enhancing the visible image quality and luminance.
Implementation Method 1
a high refractive index member on the light emitting layer, overlapping the light emitting layer and including a first pattern defining a concave portion recessed in a cross-section, and a low refractive index member on the high refractive index member, covering the high refractive index member and having a second refractive index smaller than a first refractive index of the high refractive index member
Data Source
AI summary
A display device includes a light emitting layer, a high refractive index member on the light emitting layer, overlapping the light emitting layer and including a first pattern defining a concave portion recessed in a cross-section, and a low refractive index member on the high refractive index member, covering the high refractive index member and having a second refractive index smaller than a first refractive index of the high refractive index member.