Liquid Crystal Display Electrode Configuration for Viewing Angle and Alignment Stability
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in achieving optimal alignment and rotation of liquid crystal molecules for improved display quality and viewing angles, particularly in maintaining alignment under external stress and preventing disclination.
Innovation Solution
The liquid crystal display device incorporates a configuration with auxiliary electrodes and alignment layers on both substrates, forming a lateral or oblique electric field that enhances the alignment and rotation of liquid crystal molecules, ensuring continuity and preventing undesired alignment, using a specific arrangement of electrodes and alignment directions to maintain uniform rotation and reduce disclination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a lateral electric field is used for switching liquid crystal molecules, then the viewing angle is improved, but the alignment stability under external stress deteriorates
Solution Approach 1:
The pixel electrode is divided into multiple electrode regions (first electrode region, second electrode region, third electrode region) with different extending directions. This segmentation allows different regions to contribute to different aspects of liquid crystal alignment, achieving both wide viewing angle and stable alignment under external stress.
Solution Approach 2:
Different electrode regions are assigned different orientations and functions. The first electrode region extends in a first direction, the second in a second direction, and the third in a third direction. This local differentiation of electrode properties enables optimized performance in different areas of the pixel, resolving the contradiction between viewing angle and alignment stability.
2Manufacturing precision
If auxiliary electrodes are added to improve alignment continuity, then the display quality is improved, but the device complexity increases
Solution Approach 1:
The auxiliary electrode is merged with the pixel electrode to form an integrated electrode structure. The auxiliary electrode extends from one end of the pixel electrode in a direction different from the main extending direction, creating a unified conductive element that provides both switching function and alignment guidance without requiring separate auxiliary electrode structures.
Solution Approach 2:
The pixel electrode serves multiple functions: it acts as the main switching electrode for liquid crystal control and simultaneously functions as an auxiliary electrode for guiding liquid crystal alignment at the pixel boundaries. This multi-functionality reduces the need for additional dedicated auxiliary electrodes, simplifying the overall device structure while maintaining alignment continuity.
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 configuration achieves stable domain formation within pixels, enhancing viewing angles and maintaining display quality even under external stress, by ensuring continuous alignment and rotation of liquid crystal molecules, thus providing a wider viewing angle and improved display performance.
Implementation Method 1
noteworthy configurations for an active matrix type liquid crystal display device incorporating a switching element in each pixel are those using a lateral electric field (including a fringe electric field) such as an IPS (In-Plane Switching) mode and FFS (Fringe Field Switching) mode
Implementation Method 2
a first alignment layer covering the pixel electrode; a second alignment layer covering the counter electrode
Data Source
AI summary
In one embodiment, a liquid crystal display device comprises a pixel electrode including a first main electrode disposed between a first line and a second line and extending like a belt in a first extending direction. A first counter electrode includes a second main electrode extending like a belt in the first extending direction, a second counter electrode having a third main electrode extending like a belt in the first extending direction. The second and third main electrodes are disposed on both sides of the first main electrode, and an initial alignment direction of the liquid crystal molecules is parallel with a direction passing through an interstice between the first end side of the first main electrode and the second line, and through an interstice between the second end side of the first main electrode and the first line.