Liquid Crystal Display Four-Direction Domain Structure
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Solution Overview
Problem
Conventional liquid crystal display devices with alignment division patterns, such as the 4 DRTN mode, lose uniformity in visual angle directions when subjected to external stresses like pressing forces, causing distortion in the alignment regions and affecting display quality.
Innovation Solution
A four-direction domain structure is implemented, where each unit consists of four pixels with alignment regions that maintain a constant area ratio and different visual angle directions, ensuring uniformity even under external stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an alignment division pattern is implemented to improve viewing angle, then viewing angle is improved, but uniformity of visual angle directions is lost when external stress is applied
Solution Approach 1:
Each pixel is divided into multiple alignment regions (e.g., four regions) with different alignment directions. This segmentation allows the display to maintain wide viewing angles by providing multiple orientation options, while the specific pattern of segmentation ensures that under external stress, the overall visual angle uniformity is preserved through the distributed nature of the alignment regions.
Solution Approach 2:
The alignment regions are configured with asymmetric characteristics where adjacent pixels have different alignment direction arrangements. This asymmetric design ensures that when external stress distorts the display, no single alignment direction dominates, thereby maintaining uniformity of visual angle directions across the display surface.
2Manufacturing precision
If alignment regions are divided to achieve wide viewing angle, then display quality is improved, but distortion occurs when pressing force is applied
Solution Approach 1:
Different alignment regions within and across pixels are assigned different alignment directions (local quality variations). This allows each region to respond differently to external pressing forces, distributing the distortion effects and preventing uniform distortion across the entire display, thereby maintaining overall display quality and reducing visible artifacts.
3Adaptability or versatility
If conventional alignment division is used to improve viewing angle, then viewing angle expands, but visual angle uniformity deteriorates under external stress
Solution Approach 1:
The display surface is segmented into multiple pixels, each further divided into alignment regions with specific directional arrangements. This multi-level segmentation creates a distributed structure where external stress affects individual regions differently, preserving overall visual angle uniformity while maintaining expanded viewing angles through the diverse alignment directions.
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 structure maintains the uniformity of visual angle directions and display quality by keeping the area ratio of alignment regions constant, preventing the negative effects of external forces on the display panel.
Implementation Method 1
alignment films which align liquid crystal molecules substantially vertically to the substrate surfaces when no voltage is applied
Implementation Method 2
controlling the alignment of liquid crystal molecules in response to an electric field applied thereto in such a manner to change the polarization of light passing through the liquid crystal layer
Implementation Method 3
controlling the alignment of liquid crystal molecules in response to an electric field applied thereto
Implementation Method 4
each of the alignment films on the substrates is divided into two or more alignment regions in each of which the liquid crystal molecules are slightly tilted in a different pretilt direction from the direction perpendicular to the substrate surfaces
Data Source
AI summary
The present invention provides a liquid crystal display device which is excellent in uniformity of visual angles even when divided alignment regions are distorted due to an external pressure such as pressing pressure. The present invention provides a liquid crystal display device comprising: a pair of substrates; and a liquid crystal layer between the substrates, wherein, as viewed in a plan view of a main surface of one of the substrates, the liquid crystal display device has an alignment division pattern in which each pixel is divided into four or more alignment regions, and each set of a plurality of pixels constitutes one unit, and each of the units of the alignment division pattern comprises, in at least one pixel, an alignment region whose alignment direction is different from alignment directions of alignment regions which are located at same vertical and horizontal positions in the other pixels.