Liquid Crystal Display Viewing Angle Control via Orthogonal Polarizers
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Solution Overview
Problem
Existing liquid crystal display devices struggle to freely adjust the viewing angle center and control the viewing angle in both longitudinal and lateral directions, particularly in in-vehicle applications like car navigation systems, where light reflection on windshields interferes with driving.
Innovation Solution
A liquid crystal display device configuration featuring a first polarizer and a second polarizer with orthogonal absorption axes, accompanied by first and second light absorption anisotropic layers containing organic dichroic coloring agents, allowing for adjustable transmittance central axes and enhanced alignment for improved visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a first polarizer with absorption axis in the plane and a second polarizer with dichroic substance are used in combination, then light reflection on windshield can be prevented and viewing angle can be controlled in longitudinal direction, but the viewing angle control is limited to longitudinal direction only and cannot be freely adjusted in lateral direction
Solution Approach 1:
The patent employs dynamic control of viewing angle by using liquid crystal layers that can change their optical properties in response to applied voltages. The liquid crystal layers enable the display to dynamically adjust the viewing angle center position and control range in both longitudinal and lateral directions, transforming a static viewing angle control system into a dynamic one that can adapt to different viewing requirements.
Solution Approach 2:
The patent extends viewing angle control from one dimension (longitudinal direction only) to two dimensions (both longitudinal and lateral directions) by strategically positioning and orienting multiple liquid crystal layers with different optical axes. This dimensional expansion allows the display to control light transmission in a comprehensive manner, enabling free adjustment of the viewing angle center in any direction on the viewing plane.
2Object-affected harmful factors
If the absorption axis of the first polarizer is disposed in the lateral direction, then the viewing angle in the longitudinal direction can be narrowed, but the need to narrow the viewing angle in the lateral direction cannot be satisfied
Solution Approach 1:
The patent divides the viewing angle control function into multiple independent liquid crystal layers, each responsible for controlling light transmission in specific directions. By segmenting the control mechanism, the system can independently adjust viewing angle parameters in both longitudinal and lateral directions, allowing the viewing angle center to be freely positioned without being constrained to a single orientation.
Solution Approach 2:
The patent creates a universal viewing angle control system that can handle both longitudinal and lateral direction requirements simultaneously. The multiple liquid crystal layers work together to provide multi-functional control, enabling the display to narrow viewing angles in any desired direction and position the viewing angle center anywhere on the viewing plane, rather than being limited to a fixed orientation.
3Measurement precision
If the center of the viewing angle is changed in the longitudinal direction only by inclining the absorption axis, then visual recognition is unbalanced with one side having better recognition than the other, but free adjustment of the viewing angle center in specific directions cannot be achieved
Solution Approach 1:
The patent employs asymmetric arrangement of liquid crystal layers with different optical axes and orientations to achieve balanced viewing angle control. Rather than using symmetric configurations that limit adjustment flexibility, the asymmetric design allows independent control of viewing angle center position in both longitudinal and lateral directions, enabling the system to optimize visual recognition accuracy for specific viewing directions while maintaining overall balance.
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
Enables flexible adjustment of the viewing angle center and effective control of the viewing angle in both longitudinal and lateral directions, reducing light reflection interference and enhancing visibility in in-vehicle displays.
Implementation Method 1
a first polarizer and a second polarizer with orthogonal absorption axes... the first polarizer and the second polarizer each have an absorption axis in a film surface
Implementation Method 2
first and second light absorption anisotropic layers containing organic dichroic coloring agents... an angle θ1 between a transmittance central axis of the first light absorption anisotropic layer and a normal line of the film
Data Source
AI summary
A liquid crystal display device includes a first polarizer, a liquid crystal cell, and a second polarizer in this order from a viewing side, in which a first light absorption anisotropic layer is disposed on the viewing side of the liquid crystal cell, a second light absorption anisotropic layer is disposed on a non-viewing side of the liquid crystal cell, the first and second polarizers each have an absorption axis in a film surface, the absorption axis of the first polarizer is orthogonal to the absorption axis of the second polarizer, an angle θ1 between a transmittance central axis of the first anisotropic layer and a normal line of the film is in a range of 0° to 45°, and an angle θ2 between a transmittance central axis of the second anisotropic layer and a normal line of the film is in a range of 0° to 45°.