Liquid Crystal Display Panel With Four Alignment Regions
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Solution Overview
Problem
Liquid crystal display panels with multiple alignment regions suffer from irregular alignment of liquid crystal molecules at borders, leading to dark lines and reduced transmittance, which worsens with increased pixel definition.
Innovation Solution
A liquid crystal display panel design with four alignment regions providing different tilt azimuths (45°, 135°, 225°, and 315°) in a longitudinal direction, using photo-alignment films and a specific photo-alignment treatment method where the polarization axis of the polarizer forms a 45° angle with the light irradiation direction to stabilize liquid crystal molecule alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If one pixel is divided into multiple alignment regions to enhance viewing angle characteristics, then viewing angle characteristics are improved, but the number of regions with irregular alignment increases, leading to more dark lines and reduced transmittance
Solution Approach 1:
The pixel is divided into multiple alignment regions (e.g., four regions) with different tilt azimuths to enhance viewing angle characteristics. Each region has liquid crystal molecules aligned at different angles, allowing the display to maintain quality from various viewing angles. This segmentation directly addresses the technical contradiction by enabling multiple alignment states within a single pixel.
Solution Approach 2:
Different alignment regions within the same pixel are assigned different tilt azimuths (e.g., 0°, 45°, 90°, 135°) to optimize local viewing characteristics. Each region's liquid crystal molecules are aligned according to its specific spatial position, creating locally optimized alignment that contributes to overall viewing angle enhancement while managing the complexity of multiple alignment states.
2Illumination intensity
If the number of alignment regions is increased to improve viewing angle characteristics, then viewing angle characteristics are enhanced, but the proportion of dark lines increases, reducing transmittance
Solution Approach 1:
The pixel is divided into multiple alignment regions (e.g., four regions) with different tilt azimuths to enhance viewing angle characteristics. Each region has liquid crystal molecules aligned at different angles, allowing the display to maintain quality from various viewing angles. This segmentation directly addresses the technical contradiction by enabling multiple alignment states within a single pixel.
Solution Approach 2:
The tilt azimuth parameter is varied across different alignment regions (e.g., 0°, 45°, 90°, 135°) to optimize the balance between viewing angle characteristics and dark line formation. By systematically changing this geometric parameter across regions, the patent achieves enhanced viewing angles while controlling the formation of dark lines through controlled alignment variations.
3Illumination intensity
If photo-alignment treatment is performed with polarization axis perpendicular to light irradiation direction to form multiple alignment regions, then viewing angle characteristics are improved, but manufacturing complexity increases
Solution Approach 1:
The pixel is divided into multiple alignment regions (e.g., four regions) with different tilt azimuths to enhance viewing angle characteristics. Each region has liquid crystal molecules aligned at different angles, allowing the display to maintain quality from various viewing angles. This segmentation directly addresses the technical contradiction by enabling multiple alignment states within a single pixel.
Solution Approach 2:
Photo-alignment treatment is performed in advance to pre-align liquid crystal molecules in different tilt azimuths before voltage is applied. By preparing the alignment configuration beforehand through controlled light irradiation with specific polarization orientations, the patent establishes the desired multi-region alignment structure without requiring complex real-time control during operation.
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 design significantly reduces dark line generation and enhances transmittance while maintaining high productivity in manufacturing, addressing the challenges of irregular alignment and reduced viewing angle characteristics.
Implementation Method 1
the first vertical alignment film and the second vertical alignment film are photo-alignment films which, upon being subjected to photo-alignment treatment, provide a pre-tilt angle to the liquid crystal molecules
Data Source
AI summary
A liquid crystal display panel includes in the following order: a first substrate including pixel electrodes; a first vertical alignment film; a liquid crystal layer containing liquid crystal molecules; a second vertical alignment film; and a second substrate including a counter electrode. The liquid crystal display panel includes pixels each including four alignment regions which provide different tilt azimuths to the liquid crystal molecules and are arranged in a longitudinal direction of each pixel. The liquid crystal display panel includes first, second, third, and fourth alignment regions providing the respective specific alignment azimuths. The liquid crystal molecules are aligned in a direction substantially perpendicular to the first and second vertical alignment films and at a tilt in the respective tilt azimuth directions with no voltage applied to the liquid crystal layer and are to be more tilted in the respective tilt azimuth directions upon application of voltage to the liquid crystal layer. The liquid crystal molecules are at a twist angle of substantially 0° in each of the four alignment regions.