Curved VA Display Panel with Single-Side Alignment
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Solution Overview
Problem
Current curved displays using vertical alignment (VA) type liquid crystal display panels suffer from 'black clusters' issues due to uneven brightness caused by abnormal liquid crystal molecule alignment when bent, leading to poor display quality.
Innovation Solution
A liquid crystal display panel design featuring a self-alignment liquid crystal material with distinct pretilt angles for molecules near the array and opposing substrates, where the alignment layer is only on the array substrate, utilizing a fast responsive photo-alignment material and slow angular velocity liquid crystal molecules to create a significant difference in pretilt angles, mitigating the 'black clusters' problem.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional VA type liquid crystal display panels are bent to create curved displays, then curved display appearance and viewing angles are improved, but black clusters appear on both sides of bending areas causing uneven brightness
Solution Approach 1:
The patent applies different pretilt angles to different regions of the liquid crystal layer. The first pretilt angle (2.4°-4°) is applied to the region near the array substrate, while the second pretilt angle (0°-0.6°) is applied to the region near the opposing substrate. This local differentiation compensates for the abnormal alignment that occurs when the display is bent, thereby eliminating black clusters while maintaining the curved appearance.
2Manufacturing precision
If alignment layer is disposed on both array substrate and opposing substrate, then liquid crystal molecule alignment is controlled, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent removes the alignment layer from the opposing substrate, keeping it only on the array substrate. This extraction simplifies the device structure and manufacturing process while still achieving effective liquid crystal molecule alignment through the combination of the remaining alignment layer and the self-alignment liquid crystal material properties.
3Speed
If fast responsive photo-alignment material is used, then alignment speed is improved, but pretilt angle control precision may be reduced
Solution Approach 1:
The patent utilizes the different angular velocities of the liquid crystal molecules in response to photo-alignment. By controlling the photo-alignment process parameters, the first pretilt angle region achieves faster alignment speed while the second pretilt angle region maintains precise angle control, achieving both fast response and precise control through parameter optimization.
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 solution effectively compensates for abnormal liquid crystal molecule alignment during bending, reducing 'black clusters' and improving display quality, especially in high-end curved displays with curvatures of 1500 R and 1800 R, by ensuring a faster response time and ideal performance.
Implementation Method 1
utilizing a fast responsive photo-alignment material and slow angular velocity liquid crystal molecules to create a significant difference in pretilt angles
Implementation Method 2
a liquid crystal layer made of a self-alignment liquid crystal material... the first liquid crystal molecules are located on a side of the liquid crystal layer near the array substrate, and the second liquid crystal molecules are located on a side of the liquid crystal layer near the opposing substrate
Data Source
AI summary
The present application discloses a liquid crystal display panel, a method for manufacturing the liquid crystal display panel, and a curved display. The liquid crystal display panel is configured with an alignment layer only on an array substrate, but not on an opposing substrate opposite to the array substrate. After photo-alignment, a pretilt angle of liquid crystal molecules near the array substrate is greater than a pretilt angle of liquid crystal molecules near the opposing substrate to effectively mitigate a problem of “black clusters.”