LCD Orienting Structures Outside Pixel Area
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Solution Overview
Problem
Conventional liquid crystal display (LCD) devices with wide viewing angles suffer from singular points due to convex structures within the pixel area, leading to image flaws and reduced aperture ratio.
Innovation Solution
An LCD device design featuring a first substrate with a pixel unit and a first orienting structure outside the display area, using a liquid crystal layer with negative dielectric anisotropy and optical rotation materials, where liquid crystal molecules are inclined or rotated by the orienting structure, allowing for varied orientations and improved light transmission without singular points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If convex structures are used within the pixel area to achieve wide viewing angle, then the liquid crystal molecules can topple in different directions, but singular points are generated causing image flaws and reduced aperture ratio
Solution Approach 1:
The patent extracts the orienting structures from the pixel area and relocates them to the non-display area. The grooves are formed in the non-display area of the substrate, allowing liquid crystal molecules to be oriented without interfering with the pixel structure. This eliminates singular points within the pixel area while maintaining the multi-domain toppling effect for wide viewing angle.
Solution Approach 2:
The patent transitions from two-dimensional in-plane orientation to three-dimensional orientation by forming grooves that extend through the substrate thickness. The grooves have specific depth and width dimensions that create vertical and lateral orientation components, enabling liquid crystal molecules to topple in multiple directions without requiring convex structures within the pixel area.
2Adaptability or versatility
If convex structures are used within the pixel area to achieve wide viewing angle, then the liquid crystal molecules can topple in different directions, but the aperture ratio is reduced due to the structures occupying pixel area
Solution Approach 1:
The orienting grooves are extracted from the pixel area and relocated to the non-display area. This extraction eliminates the occupation of pixel area by orienting structures, thereby maximizing the aperture ratio while maintaining the wide viewing angle effect through proper groove geometry and orientation.
Solution Approach 2:
The substrate is segmented into display area and non-display area, with orienting structures confined to the non-display area. This segmentation allows independent optimization of the pixel area for maximum aperture ratio while the non-display area accommodates the orienting grooves needed for wide viewing angle performance.
3Reliability
If liquid crystal molecules are vertically aligned to achieve high contrast, then the viewing angle is narrow, but wide viewing angle requires multi-domain toppling
Solution Approach 1:
The patent creates a dynamic multi-domain orientation system where liquid crystal molecules can topple in different directions based on the groove orientations. The grooves are configured to induce controlled toppling in multiple domains while maintaining vertical alignment characteristics, enabling both high contrast and wide viewing angle through dynamic molecular reorientation.
Solution Approach 2:
The patent introduces asymmetric groove patterns in the non-display area that create symmetric multi-domain toppling effects. The grooves are oriented at specific angles and depths to induce liquid crystal molecules to topple in complementary directions, achieving wide viewing angle while maintaining contrast through balanced domain distribution.
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 design enhances light transmission rates and contrast, providing a wider viewing angle without singular points, combining the advantages of TN and MVA LCD devices while minimizing light leakage.
Implementation Method 1
a liquid crystal layer sealed between the first and second substrates and having negative dielectric anisotropy
Implementation Method 2
The liquid crystal layer contains an optical rotation material, and the first orienting structure forces some of the liquid crystal molecules of the liquid crystal layer to incline toward the internal part or the external part of the pixel unit
Data Source
AI summary
This object aims to provide a liquid crystal display panel with good in viewing angle characteristic, and capable of carrying out a high brightness display. The liquid crystal display device includes a first substrate having at least one pixel unit and at least one first orienting structure, a second substrate disposed opposite to the first substrate, and a liquid crystal layer sealed between the first and second substrates and having negative dielectric anisotropy. The pixel unit includes a pixel electrode that is located in the display area, while the first orienting structure is located outside the display area. In addition, the liquid crystal layer contains an optical rotation material, and some of the liquid crystal molecules in the liquid crystal layer are inclined toward the internal part or the external part of the pixel unit by the first orienting structure.