Optical Element Layout for Asymmetric Display Viewing Angles
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Solution Overview
Problem
Existing display devices face challenges in achieving horizontally asymmetric luminance distribution and suppressing light transmission in specific directions, with existing viewing angle control technologies either failing to provide desired light distribution or reducing overall brightness.
Innovation Solution
An optical element comprising a first and second polarizing plate with immobilized liquid crystal films having hybrid orientation, stacked in a specific configuration to control viewing angles, reducing light transmission in desired directions while maintaining brightness in others.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a prism structure is used for viewing angle control, then light transmission in specific directions can be suppressed, but horizontally asymmetric luminance distribution cannot be achieved
Solution Approach 1:
The patent applies asymmetry by configuring the second liquid crystal film with a different orientation than the first liquid crystal film. Specifically, the second liquid crystal film is oriented at an angle of 15° to 45° relative to the first liquid crystal film, creating asymmetric optical properties that enable horizontally asymmetric luminance distribution while maintaining light transmission suppression capabilities
Solution Approach 2:
The patent implements local quality by giving different orientation characteristics to different regions of the liquid crystal films. The first and second liquid crystal films have distinct orientation angles, allowing each region to contribute differently to the overall optical effect, thereby achieving both light suppression and asymmetric luminance distribution
2Ease of operation
If a louver film is used for viewing angle control, then desirable light distribution can be provided, but overall brightness is reduced
Solution Approach 1:
The patent changes the optical parameters by precisely controlling the orientation angles of the liquid crystal films and setting the front phase difference to 200 nm or more. This parameter optimization allows the system to achieve desirable light distribution while minimizing brightness reduction, unlike conventional louver films that inherently reduce overall brightness
3Object-affected harmful factors
If different types of phase difference films are used, then light transmission suppression in specific directions can be achieved, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple phase difference films into a single liquid crystal film structure. By using one liquid crystal film with controlled orientation and sufficient front phase difference (200 nm or more), the patent achieves light transmission suppression without requiring multiple different types of phase difference films, thereby reducing device complexity
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 optical element achieves asymmetric brightness distribution, effectively reducing light transmission in specific directions while enhancing visibility in other areas, such as suppressing reflections on vehicle windows while maintaining adequate brightness for drivers.
Implementation Method 1
the first liquid crystal film and the second liquid crystal film each include a liquid crystal molecule immobilized in hybrid orientation along a normal direction
Implementation Method 2
a front phase difference of the first liquid crystal film and the second liquid crystal film is 200 nm or larger
Implementation Method 3
a first polarizing plate having a first absorption axis, a second polarizing plate facing the first polarizing plate and having a second absorption axis
Data Source
AI summary
An optical element includes a first polarizing plate having a first absorption axis, a second polarizing plate facing the first polarizing plate and having a second absorption axis, and a first liquid crystal film and a second liquid crystal film provided between the first polarizing plate and the second polarizing plate. The second polarizing plate, the second liquid crystal film, the first liquid crystal film, and the first polarizing plate are stacked in order, the first liquid crystal film and the second liquid crystal film each include a liquid crystal molecule immobilized in hybrid orientation along a normal direction, and a front phase difference of the first liquid crystal film and the second liquid crystal film is 200 nm or larger.