Refractive Index Layer Structure for Front-Directed Display Emission
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Solution Overview
Problem
Emissive display devices face low light emission region efficiency due to significant light loss while passing through multiple layers, with existing solutions like lenses being difficult to control and limited in improving efficiency.
Innovation Solution
A display device structure incorporating a substrate with a light-emitting element, a planarization layer, and refractive index layers with total and refraction inclination surfaces to optimize light emission, including a first refractive index layer with a ring shape surrounding the light-emitting region, a second layer with a smaller refractive index, and a third layer with a higher refractive index, to enhance light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a lens is formed to improve light emission efficiency, then light emission region efficiency is improved, but it is difficult to control the curvature of the lens and the distance between the lens and the light emitting diode is relatively long
Solution Approach 1:
The patent changes the refractive index parameter of the layers surrounding the light-emitting element. By forming a low refractive index layer (refractive index < 1.5) and a high refractive index layer (refractive index > 1.7) with specific thickness ratios, the patent achieves light emission efficiency improvement without requiring complex curvature control or long distances, thus resolving the technical contradiction.
2Adaptability or versatility
If multiple layers are used in the light-emitting element structure, then device functionality is enhanced, but significant light is lost while passing through several layers
Solution Approach 1:
The patent applies local quality by creating specific refractive index zones around the light-emitting element. The low refractive index layer is positioned adjacent to the light-emitting element, while the high refractive index layer surrounds it, forming a gradient structure that locally optimizes light extraction without compromising overall device functionality. This spatial differentiation of refractive indices reduces light loss while maintaining enhanced device functionality.
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 proposed structure improves light emission efficiency by allowing light to be emitted frontward through total reflection and refraction, extending the light emission region and enhancing the display device's performance.
Implementation Method 1
a first refractive index layer on the planarization layer and including a total reflection inclination surface totally reflecting light emitted from the light-emitting element in a front direction
Implementation Method 2
a refraction inclination surface refracting light emitted from the light-emitting element in the front direction
Data Source
AI summary
A display device includes: a substrate; a light-emitting element on the substrate; a planarization layer on the light-emitting element; a first refractive index layer on the planarization layer and including a total reflection inclination surface totally reflecting light emitted from the light-emitting element in a front direction and a refraction inclination surface refracting light emitted from the light-emitting element in the front direction; a second refractive index layer on the first refractive index layer to be in contact with the refraction inclination surface and having a smaller refractive index than a refractive index of the first refractive index layer; and a third refractive index layer on the first refractive index layer and the second refractive index layer to be in contact with the total reflection inclination surface and having a larger refractive index than the refractive index of the first refractive index layer.