Liquid Crystal Viewing-Angle Panel With Dichroic Louver Control
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Solution Overview
Problem
Existing video display devices face challenges in effectively controlling viewing angles with existing technologies, leading to issues such as insufficient louver function and light transmission without absorption, particularly due to the polarization direction of incident light, which affects the absorption and transmission functions of the liquid crystal layer.
Innovation Solution
A video display device incorporating a liquid crystal panel with a guest-host liquid crystal layer containing dichroic dye, where electrodes are arranged in a stripe shape, and the alignment direction of liquid crystal molecules is orthogonal to the polarizer's transmission axis, allowing for regions to switch between transmission and absorption states, thereby enhancing viewing angle control with minimal thickness increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a liquid crystal layer with dichroic dye is used to control viewing angle, then viewing angle control is improved, but light transmission loss increases because light orthogonal to the alignment direction is not absorbed
Solution Approach 1:
The liquid crystal layer is divided into multiple regions with different alignment directions. First liquid crystal regions have their alignment directions substantially perpendicular to the transmission axis of the polarizer, while second liquid crystal regions have alignment directions substantially parallel to the transmission axis. This segmentation allows selective absorption of light in different regions, improving viewing angle control while reducing overall light transmission loss.
Solution Approach 2:
Different regions of the liquid crystal layer are assigned different functional properties. The first liquid crystal regions provide light absorption for viewing angle control, while the second liquid crystal regions maintain high light transmission. This local differentiation of quality allows the system to achieve both viewing angle control and high luminance simultaneously.
2Adaptability or versatility
If multiple liquid crystal layers with different alignment directions are introduced to improve light absorption, then viewing angle control is enhanced, but device complexity increases
Solution Approach 1:
Multiple liquid crystal layers with different alignment directions are combined into a single integrated liquid crystal layer. The first and second liquid crystal regions are formed within the same layer structure, eliminating the need for separate layers and reducing overall device complexity while maintaining enhanced viewing angle control capabilities.
Solution Approach 2:
The single liquid crystal layer performs multiple functions by containing both first liquid crystal regions for light absorption and second liquid crystal regions for light transmission. This multi-functional design eliminates the need for separate dedicated layers for each function, simplifying the overall device structure.
3Illumination intensity
If the polarizer transmission axis is aligned parallel to the initial alignment direction of liquid crystal molecules, then light transmission is maximized, but viewing angle control effectiveness is reduced
Solution Approach 1:
The relationship between the polarizer transmission axis and liquid crystal alignment directions is made asymmetric. The first liquid crystal regions have alignment directions substantially perpendicular to the transmission axis, creating maximum absorption, while the second regions have alignment directions substantially parallel to the transmission axis, creating maximum transmission. This asymmetric arrangement enables effective viewing angle control while maintaining high luminance.
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 provides effective viewing angle control and louver functionality, reducing thickness and manufacturing costs while maintaining high display luminance and image quality, without the need for additional louver layers.
Implementation Method 1
a liquid crystal layer, and an electrode B arranged opposite to the electrodes A with the liquid crystal layer between the electrodes A and the electrode B... the liquid crystal layer being a guest-host liquid crystal layer containing a dichroic dye and liquid crystal molecules
Implementation Method 2
controls the light transmission amount by applying a voltage to the liquid crystal layer to change the alignment state of liquid crystal molecules according to the applied voltage
Implementation Method 3
a polarizer with a transmission axis orthogonal to the initial alignment direction of liquid crystal molecules
Data Source
AI summary
Provided are a liquid crystal panel capable of controlling the viewing angle with less increase in thickness and a video display device including the liquid crystal panel. The video display device includes: a display panel displaying an image; and a liquid crystal panel. The display panel includes at least a polarizer. The polarizer in the display panel is opposite to the liquid crystal panel on the display panel side of the liquid crystal panel. The liquid crystal panel includes, between a pair of transparent substrates, electrodes A arranged at intervals in plan view, a liquid crystal layer, and an electrode B opposite to the electrodes A with the liquid crystal layer interposed therebetween, and includes a voltage application unit which applies voltage between the electrodes A and the electrode B.