View Angle-Restricting Sheet with Scattering Microstructures
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Solution Overview
Problem
Existing view angle-restricting sheets for flat panel displays face challenges in preventing personal information leakage from oblique directions while maintaining front face luminance, as they often reduce luminance due to constant light-absorbing section intervals.
Innovation Solution
A view angle-restricting sheet with optically functional layers featuring rectangular light transmission sections and light-scattering surfaces with microstructures, allowing light to diffuse and exit at predetermined angles, while maintaining sharp images for front viewers and blurring images for oblique viewers, thus preventing information leakage and maintaining luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light-absorbing sections are arranged at constant intervals in the view angle-restricting sheet, then oblique direction viewing is restricted, but front face luminance is reduced
Solution Approach 1:
The patent applies local quality by differentiating the optical properties of different regions: the first light transmission section has a smooth surface for high luminance transmission, while the second light transmission section has a light-scattering surface with micro-protrusions for oblique light restriction. This localized differentiation allows each region to optimize its function without compromising the other.
Solution Approach 2:
The patent segments the light transmission path into multiple sections with different surface characteristics. By dividing the optical path into a first light transmission section (smooth) and a second light transmission section (scattering), the system can independently control light behavior in each section to achieve both high luminance and oblique viewing restriction.
2Illumination intensity
If a light-scattering surface with micro-protrusions is introduced, then oblique light is diffused and front face luminance is maintained, but device complexity increases
Solution Approach 1:
The patent changes the surface parameter (roughness) of the second light transmission section by introducing micro-protrusions with specific dimensional ratios (height to width between 0.2-2.0). This parameter modification enables the light-scattering function while maintaining manufacturability and avoiding excessive complexity.
Solution Approach 2:
The patent uses a simplified representation of the light-scattering surface through micro-protrusions that replicate the essential light-diffusing function without requiring complex actual scattering structures. The micro-protrusions serve as an engineered copy that achieves the desired optical effect with practical manufacturing constraints.
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 effectively prevents personal information leakage from oblique directions while maintaining front face luminance by diffusing light at the light-scattering surfaces, ensuring a sharp image for front viewers and reducing luminance loss.
Implementation Method 1
at least one of the lateral face of the first light transmission section and the lateral face of the second light transmission section that face each other being provided as a light-scattering surface having a microstructure including fine protrusions
Data Source
AI summary
The view angle-restricting sheet according to the present invention includes an optically functional layer which includes: a plurality of first light transmission sections that are rectangular in cross section and arranged in a multi-stripe fashion; and at least one second light transmission section that is/are rectangular in cross section and arranged between the first light transmission sections, at least one of the lateral face of the first light transmission section and the lateral face of the second light transmission section that face each other being provided as a light-scattering surface having a microstructure including fine protrusions. The arithmetic mean roughness (Ra) of the light-scattering surface is preferably no less than 1.5 μm and no greater than 4 μm. The ratio (Rz/Ra) of the ten-point mean roughness (Rz) to the arithmetic mean roughness (Ra) of the light-scattering surface is preferably no less than 1 and no greater than 20.