Display Device Antireflection Layer and Corrugated Light Absorber
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Solution Overview
Problem
Conventional display devices with corrugated surfaces suffer from reduced photopic contrast due to external light reflection, which is not effectively addressed by existing technologies.
Innovation Solution
A display device comprising light emitting units surrounded by a light absorbing unit with a corrugated surface and a low-reflection layer formed along the corrugated surface, which diffuses light and reduces external light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a corrugated surface is formed on the outermost surface of the display device, then light diffusion is improved, but external light reflection increases causing reduced photopic contrast
Solution Approach 1:
The patent applies different surface treatments to different regions: the light emitting units have a specific surface finish while the light absorbing portions have a corrugated surface structure. This local differentiation allows light diffusion in functional areas while controlling reflection in non-functional areas, resolving the contradiction between light diffusion and reflection reduction.
Solution Approach 2:
The patent introduces an intermediate layer or surface treatment between the corrugated surface and the external environment. This intermediary structure modifies the optical interaction, allowing the corrugated surface to diffuse light while the intermediate layer controls the reflection characteristics, thereby reducing external light reflection while maintaining light diffusion.
2Ease of manufacture
If a flat surface is used for the outermost surface, then manufacturing is simpler, but external light reflection occurs reducing contrast
Solution Approach 1:
Instead of making the entire surface corrugated, the patent applies the corrugated structure only to specific light absorbing portions while keeping other areas flat or with different surface characteristics. This localized approach maintains manufacturing simplicity for the overall device while introducing reflection-reducing features only where needed.
3Object-generated harmful factors
If the light emitting units and light absorbing portions are at different heights forming a corrugated surface, then light absorption is improved, but external light reflection increases
Solution Approach 1:
The patent differentiates the surface properties of light emitting units from light absorbing portions. The light absorbing portions have corrugated surfaces optimized for absorption, while the light emitting units have surface treatments optimized for light extraction and emission. This local optimization allows both functions to perform well without the entire surface suffering from excessive reflection.
Solution Approach 2:
The patent introduces intermediate surface layers or coatings on the light emitting units that mediate between the corrugated structure and the external environment. These intermediary layers reduce the Fresnel reflection at the interface while allowing the underlying corrugated structure to maintain its light absorption 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 solution improves contrast and reduces external light reflection, enhancing the visual appearance of display devices by diffusing light and minimizing specular reflections.
Implementation Method 1
the surface of the light absorbing unit is a corrugated surface that diffuses light
Implementation Method 2
external light reflection at the reflectance corresponding to the refractive index difference between the outermost surface and the air (Fresnel reflection) occurs
Data Source
AI summary
A display device includes: light emitting units; a light absorbing unit that surrounds each of the light emitting units; and a low-reflection layer provided on the surfaces of the light emitting units and the surface of the light absorbing unit. The surface of the light absorbing unit is a corrugated surface that diffuses light, and the low-reflection layer is formed along the corrugated surface.