Light Absorption Anisotropic Film for Viewing Angle Control
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Solution Overview
Problem
Current image display devices lack advanced control over viewing angles, particularly in applications like in-vehicle displays, where it is essential to enhance visibility of crucial information for the driver while reducing visibility for others, and existing technologies do not effectively manage visibility and controllability across different viewing angles.
Innovation Solution
A light absorption anisotropic film comprising a dichroic substance and a liquid crystal compound, with multiple regions having different transmittance central axes orientations, allowing for controlled visibility and improved viewing angle controllability by adjusting the angles between the transmittance central axes and the film's surface normal direction within a range of 0° to 70°.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a polarizer with a fixed absorption axis is used, then the structure is simple, but the viewing angle control is insufficient
Solution Approach 1:
The film is divided into multiple regions with different transmittance central axis orientations. Each region has a specific angle θ relative to the normal direction, allowing different viewing angles to be controlled independently. This segmentation enables precise viewing angle control while maintaining a relatively simple single-film structure.
Solution Approach 2:
Different regions of the film are assigned different optical properties (different transmittance central axis orientations). This allows the film to have location-specific functions, where each region controls light transmission for a particular viewing angle range, thereby achieving versatile viewing angle control.
2Adaptability or versatility
If the angle between absorption axis and normal line is limited to 0° to 45°, then the manufacturing is simple, but the viewing angle control is not strict enough
Solution Approach 1:
The film structure transitions from a fixed absorption axis to multiple dynamic orientations of transmittance central axes. By introducing multiple regions with different angles θ, the system can dynamically control light transmission for various viewing angles, achieving strict viewing angle control while keeping the manufacturing process relatively straightforward.
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 enables precise control of visibility regions, enhancing viewing angle controllability in image display devices, ensuring that critical information is readily visible for the driver while minimizing visibility for others, thereby improving the overall display performance.
Implementation Method 1
a dichroic substance
Implementation Method 2
a liquid crystal compound
Data Source
AI summary
A light absorption anisotropic film that, when being applied to an image display device, it is easy to control a region where visibility is high and a region where visibility is low and viewing angle controllability is more excellent, an optical film, and an image display device. The light absorption anisotropic film contains a dichroic substance and a liquid crystal compound, in which the light absorption anisotropic film has a plurality of regions having different directions of transmittance central axes in an in-plane direction of the light absorption anisotropic film, in the plurality of regions, all angles θ between the transmittance central axes and a normal direction of a surface of the light absorption anisotropic film are in a range of 0° to 70°, and any of a specific requirement 1, a specific requirement 2, or a specific requirement 3 is satisfied.