Liquid Crystal Alignment via Pretilt Angle Differentiation
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Solution Overview
Problem
Existing vertical alignment liquid crystal display (VA-LCD) panels suffer from a poor low grayscale view angle due to uniform liquid crystal pretilt angles, leading to limited display quality improvements.
Innovation Solution
A liquid crystal alignment method is introduced, where a first common electrode is applied with an alignment voltage to create a difference in pretilt angles between liquid crystal molecules corresponding to branch electrodes and those corresponding to slits within the same domain of a subpixel, and ultraviolet light is used to fix these angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a pixel is divided into a plurality of domains to improve the view angle, then the view angle is improved, but a transmittance loss occurs
Solution Approach 1:
The patent applies different pretilt angles to different regions within the same domain: liquid crystal molecules corresponding to branch electrodes are given a first pretilt angle (e.g., 2.0°), while those corresponding to slits are given a second pretilt angle (e.g., 0.5°). This local differentiation of pretilt angles improves view angle without requiring domain division, thereby avoiding transmittance loss.
2Speed
If the liquid crystal pretilt angle is increased to improve response time, then the response time is improved, but the view angle may be affected
Solution Approach 1:
Different pretilt angles are assigned to different liquid crystal molecule regions: molecules at branch electrode positions have larger pretilt angles (e.g., 2.0°) for faster response time, while molecules at slit positions have smaller pretilt angles (e.g., 0.5°) to maintain view angle performance. This local optimization achieves both improved response time and maintained view angle.
Solution Approach 2:
The liquid crystal layer is segmented into different functional regions corresponding to branch electrodes and slits, with each region having optimized pretilt angles for its specific function. This segmentation allows simultaneous optimization of response time and view angle in different regions.
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 method enhances the overall pretilt angle and differentiates pretilt angles within the same domain, thereby improving the response time and view angle features of medium and low grayscale in liquid crystal display panels.
Implementation Method 1
a direction of an electric field is directed from the common electrode 140 to a pixel layer 150
Implementation Method 2
applying an alignment voltage to the first common electrode, so that a pretilt angle formed by a liquid crystal molecule arranged corresponding to the slit is smaller than a pretilt angle formed by a liquid crystal molecule arranged corresponding to the branch electrode
Implementation Method 3
performing irradiation with ultraviolet light to fix the liquid crystal molecules at the pretilt angles
Data Source
AI summary
The present application discloses a liquid crystal alignment method, a liquid crystal display panel, and a mobile terminal. In a liquid crystal alignment process, a first common electrode receives an alignment voltage, and a pretilt angle of a liquid crystal molecule arranged corresponding to a slit is smaller than a pretilt angle of a liquid crystal molecule arranged corresponding to a branch electrode. In an actual driving process, because an overall pretilt angle of liquid crystal molecules is increased and pretilt angles in a same domain of a subpixel are differentiated, a response time and view angle features of medium and low grayscale of the liquid crystal display panel can be improved.