Asymmetric Optical Microstructures for Privacy Display Brightness
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Solution Overview
Problem
Wide viewing angle displays can inadvertently reveal confidential information, and traditional privacy protection methods using light control films often compromise display brightness, especially in larger monitors.
Innovation Solution
A viewing angle control film with asymmetrically distributed refracting surfaces on a transparent substrate is integrated into a display apparatus, guiding light to maintain brightness uniformity while restricting viewing angles to prevent information leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a light control film is placed in front of the display panel to filter out lights of large angles for privacy protection, then privacy protection effect is improved, but viewing angle range is reduced and display brightness in outer areas is reduced
Solution Approach 1:
The patent applies asymmetry by designing optical microstructures with asymmetric cross-sections where the inclined surfaces have different angles relative to the normal direction. Specifically, the first inclined surface has a different angle than the second inclined surface, creating asymmetric light deflection that directs light preferentially in certain viewing directions while maintaining brightness in those directions even after privacy protection filtering
Solution Approach 2:
The patent implements local quality by making the optical microstructures have spatially varying properties - each microstructure has inclined surfaces with different angles tailored to its position, and the distribution of microstructure types and orientations varies across the display surface to optimize local brightness and viewing angle control
2Loss of information
If a light control film is used to restrict viewing angles for privacy protection, then privacy protection effect is improved, but viewing angle range is reduced
Solution Approach 1:
The asymmetric cross-section design with inclined surfaces at different angles creates non-uniform light deflection patterns that provide different viewing characteristics in different directions, enabling privacy protection in sensitive directions while maintaining broader viewing angles in other directions
Solution Approach 2:
The light control film is divided into multiple optical microstructures with different orientations and asymmetric profiles, allowing different regions to control light in different ways, thereby providing both privacy protection and extended viewing angle range simultaneously
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 ensures better light emission uniformity and privacy protection by deflecting light to maintain brightness across the display screen, even in privacy protection modes, without significantly reducing overall brightness.
Implementation Method 1
Each of the multiple optical microstructures has a refracting surface away from the geometric center. First refracting angles included between the respective first refracting surfaces of the first optical microstructures and the surface of the transparent substrate are asymmetrically distributed with respect to the geometric center.
Data Source
AI summary
Disclosed is a viewing angle control film including a transparent substrate and a plurality of first optical microstructures. The first optical microstructures are disposed on a surface of the transparent substrate, and a disposed range thereof has a geometric center. Each of the first optical microstructures has a first refracting surface away from the geometric center. First refracting angles included between the respective first refracting surfaces of the first optical microstructures and the surface of the transparent substrate are asymmetrically distributed with respect to the geometric center. A display apparatus adopting the viewing angle control film is also provided.