N-Type LCD Viewing Angle Control via Segmented Electrodes
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Solution Overview
Problem
Existing LCD devices face challenges in controlling viewing angles, particularly in achieving both confidentiality and wide view angle capabilities without increasing manufacturing costs, as they often suffer from light leakage and limited visibility in horizontal directions.
Innovation Solution
The implementation of an FFS mode LCD device with n-type liquid crystal molecules and a viewing-angle control pixel that inclines liquid crystal molecules in vertical and horizontal directions, using separate common electrodes for control, allowing for confidentiality and improved visibility through controlled light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a polymer dispersed liquid crystal display layer is used to achieve wide view angle mode, then the light can proceed to side directions and the displayed image can be shared by a large number of users, but the manufacturing expenses increase
Solution Approach 1:
The common electrode is divided into multiple segments extending in different directions (first common electrode segment, second common electrode segment, third common electrode segment, fourth common electrode segment) within each pixel. This segmentation allows the liquid crystal molecules to be inclined in multiple directions, achieving wide viewing angles without requiring expensive polymer dispersed liquid crystal display layers.
2Object-affected harmful factors
If vertical alignment type LCD device is used, then confidentiality can be obtained through light leakage phenomenon in horizontal direction, but the display contrast is lowered and data may not be recognizable when viewed in horizontal direction
Solution Approach 1:
Different regions of the pixel have different electrode configurations. The first and second common electrode segments extend in a first direction, while the third and fourth common electrode segments extend in a second direction perpendicular to the first direction. This local variation in electrode structure creates different liquid crystal inclinations in different regions, enabling both confidentiality and readable display.
Solution Approach 2:
The liquid crystal molecules are inclined asymmetrically in different directions within the same pixel due to the perpendicular arrangement of common electrode segments. This asymmetric inclination pattern allows the display to show different characteristics in different viewing directions, achieving confidentiality in certain angles while maintaining readability in others.
3Ease of operation
If FFS mode LCD device with conventional common electrode is used, then the liquid crystal molecules can be inclined in predetermined direction, but the viewing angle control in both vertical and horizontal directions is limited
Solution Approach 1:
The common electrode structure is extended from a single-direction arrangement to a multi-dimensional arrangement with segments extending in perpendicular directions (first direction and second direction). This dimensional expansion of the electrode structure enables the liquid crystal molecules to be inclined in multiple directions, achieving comprehensive viewing angle control in both vertical and horizontal planes.
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
This solution enables effective control of viewing angles, ensuring confidentiality by masking information from side directions while maintaining visibility from all angles without the need for additional white pixels, thus reducing manufacturing expenses.
Implementation Method 1
the birefringence of the liquid crystal molecule does not occur, no light is transmitted. When the voltage is applied to the liquid crystal display panel as shown in FIG. 7B, the liquid crystal molecule is inclined upward. The optical axis of the liquid crystal molecule is in parallel with the absorption axis of the polarizer. Also, double refraction of the liquid crystal molecule does not occur and any light is not transmitted.
Implementation Method 2
a viewing-angle control pixel which controls the n-type liquid crystal in a pixel to have the liquid crystal molecules inclined in vertical and horizontal directions
Data Source
AI summary
An LCD device includes liquid crystal molecules of n-type liquid crystal, and a viewing-angle control pixel controlling n-type liquid crystal in a pixel. The liquid crystal molecules are inclined in vertical and horizontal directions. The liquid crystal display device may control a viewing angle in vertical and horizontal directions without forming a white sub-pixel.