Cover Window Light Path Conversion Protrusions for Display Reflectance Reduction
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Solution Overview
Problem
Existing display devices fail to effectively suppress external light reflection when light is incident from tilted directions, leading to increased reflectance and color shift, which degrades contrast and visibility.
Innovation Solution
A display device incorporating an anti-reflection polarizing film and a cover window with light path conversion protrusions, such as quadrangular pyramids or cones, that refract tilted incident light into vertical light, preventing reflection by utilizing a difference in refractive index between the protrusions and air layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarizer and linear polarizer are used to suppress reflection, then front incident light reflection is prevented, but tilted incident light reflection increases
Solution Approach 1:
The patent applies different structural characteristics to different regions of the cover window. The lower surface features light path conversion protrusions (pyramidal or conical structures) that specifically address tilted incident light, while the upper surface remains smooth for normal viewing. This local differentiation allows the cover window to handle both front and tilted incident light effectively without compromising overall performance.
Solution Approach 2:
The patent transitions from a two-dimensional flat cover window surface to a three-dimensional structured surface with light path conversion protrusions. These protrusions create additional optical paths and refraction angles, enabling the system to manage light from multiple incident angles by adding a vertical dimension to the light interaction geometry.
2Object-affected harmful factors
If light path conversion protrusions are added to the cover window, then tilted incident light is converted to vertical light, but device complexity increases
Solution Approach 1:
The patent employs pyramidal or conical protrusions on the lower surface of the cover window. These geometric shapes with curved or angled surfaces are optimized to refract tilted incident light at specific angles, converting it to vertical light that passes through the polarizers effectively. The standardized geometric forms balance optical performance with manufacturability.
Solution Approach 2:
The light path conversion protrusions act as an intermediary element between the external environment (tilted incident light) and the polarizer system. Rather than modifying the polarizers themselves or adding complex multi-layer structures, the protrusions serve as a simple geometric mediator that pre-conditions the light before it reaches the polarizing layers.
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 significantly reduces reflectance and color shift from viewing angles, improving contrast and visibility by converting tilted incident light into vertical light, which is then absorbed, thus preventing external light reflection.
Implementation Method 1
light path conversion protrusions, such as quadrangular pyramids or cones, that refract tilted incident light into vertical light
Implementation Method 2
which is then absorbed, thus preventing external light reflection
Data Source
AI summary
A display device according to the present disclosure may be provided with a light path conversion protrusion on a lower surface of a cover window to suppress external light even for light incident at a side viewing angle, thereby improving contrast and visibility.According to the present disclosure, side-view angle incident light may be converted into the same incident light as that of vertical incident light, thereby providing an effect capable of preventing the reflection of incident light from a viewing angle as well as the vertical incident light.