LCD Laminate Structure for Viewing Angle Privacy and Sunlight Resistance
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Solution Overview
Problem
Existing liquid crystal display devices struggle to simultaneously achieve effective light shielding properties and light resistance, particularly when used in vehicles where sunlight exposure is common, and fail to control viewing angles effectively to prevent unauthorized viewing.
Innovation Solution
A laminate structure comprising a first light absorption anisotropic layer, a first polarizer, a first liquid crystal cell, a second polarizer, a second liquid crystal cell, and a second light absorption anisotropic layer, with specific alignment angles and dichroic substances, allowing control of viewing angles and enhancing light shielding and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a liquid crystal display device uses conventional light shielding layers, then light shielding properties are improved, but light resistance deteriorates under prolonged sunlight exposure
Solution Approach 1:
The patent employs a composite laminate structure consisting of multiple layers including light absorption anisotropic layers containing dichroic substances, polarizing layers, and liquid crystal layers. This composite structure achieves both excellent light shielding properties and superior light resistance by distributing functions across different material layers, preventing degradation that would occur with single-material solutions under prolonged sunlight exposure.
Solution Approach 2:
The light absorption anisotropic layers are strategically positioned at specific locations within the laminate (front and/or rear surfaces) to provide localized light shielding where most needed, while other layers handle polarization and viewing angle control. This localized approach optimizes light shielding effectiveness without requiring the entire structure to be uniformly light-blocking, thereby maintaining overall light resistance.
2Ease of operation
If the display device allows wide viewing angles, then ease of operation is improved, but unauthorized viewing from oblique directions becomes possible
Solution Approach 1:
The patent incorporates electrically controllable liquid crystal layers that can dynamically adjust the viewing angle characteristics of the display. By applying different voltages, the liquid crystal molecules reorient to either widen the viewing angle for normal operation or narrow it to prevent unauthorized viewing from oblique directions, making the viewing angle a dynamic rather than static parameter.
Solution Approach 2:
The light absorption anisotropic layers containing dichroic substances exhibit different optical properties at different viewing angles and azimuthal angles. These layers can selectively absorb or transmit light based on the viewing direction, effectively creating angle-dependent optical characteristics that prevent unauthorized viewing while maintaining wide viewing angles for authorized users.
3Object-generated harmful factors
If the display device prevents reflected glare on windshield, then object-generated harmful factors are reduced, but viewing angle flexibility is limited
Solution Approach 1:
The electrically controllable liquid crystal layers enable the display to dynamically adjust its optical characteristics. When used as an in-vehicle display, the system can switch between modes: one that minimizes reflected glare on the windshield for driver safety, and another that provides wider viewing angles for passenger visibility or other applications, thereby achieving both glare prevention and viewing angle flexibility through dynamic control.
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 laminate structure provides excellent light shielding properties and resistance, enabling controlled viewing angles and preventing unauthorized viewing, especially in vehicle displays.
Implementation Method 1
the first light absorption anisotropic layer and the second light absorption anisotropic layer contain a dichroic substance
Implementation Method 2
a first polarizer, a first liquid crystal cell, a second polarizer
Data Source
AI summary
The present invention provides a laminate where, as a member of a liquid crystal display device, a viewing angle of the device can be controlled, and has excellent light shielding and resistance properties. The laminate includes, in the following order, a first light absorption anisotropic layer, a first polarizer, a first liquid crystal cell, a second polarizer, a second liquid crystal cell, and a second light absorption anisotropic layer, in which an absorption axis of the first polarizer to the second polarizer is orthogonal, the first and second light absorption anisotropic layer contain a dichroic substance, an angle θ1 between a transmittance central axis and a normal direction of a surface of the first light absorption anisotropic layer is 0° to 45°, and an angle θ2 between a transmittance central axis and a normal direction of a surface of the second light absorption anisotropic layer is 0° to 45°.