Curved LCD Pretilt Angle Compensation for Panel Misalignment
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Solution Overview
Problem
In curved liquid crystal displays, the misalignment of panels due to buckling at the center causes a deviation in pretilt directions, leading to dark textures and degraded display quality.
Innovation Solution
A liquid crystal display with a difference in pretilt angles between the TFT panel and the opposing panel, achieved by using alignment layers with reactive mesogen polymers, where one panel is exposed to UV and cured at different temperatures to create a distinct pretilt angle, reducing misalignment and texture formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the display panel is bent to create a curved shape, then immersion and realism are improved, but buckling is generated at the center portion causing panel misalignment
Solution Approach 1:
The patent applies preliminary anti-action by creating different pretilt angles in the alignment layers before the panel is assembled. The first alignment layer has a first pretilt angle and the second alignment layer has a second pretilt angle, which are designed in advance to compensate for the misalignment that will occur when the panel is bent into a curved shape. This pre-established angular difference counteracts the buckling-induced misalignment, preventing dark textures from forming.
Solution Approach 2:
The patent implements local quality by making the pretilt angles different at different locations in the alignment layers. Specifically, the first alignment layer has a pretilt angle that differs from the second alignment layer's pretilt angle, creating a localized angular difference that specifically addresses the misalignment issue in the curved region without affecting other areas of the display panel.
2Shape
If the panels are misaligned due to buckling, then the display panel can be curved, but dark textures are generated in pixels degrading display quality
Solution Approach 1:
The patent applies preliminary anti-action by pre-establishing different pretilt angles in the alignment layers to counteract the misalignment that occurs during panel bending. The first pretilt angle and second pretilt angle are designed in advance to compensate for the buckling effect, preventing the formation of dark textures and maintaining display quality in the curved configuration.
Solution Approach 2:
The patent implements parameter changes by modifying the pretilt angle parameter in the alignment layers. The first alignment layer is configured with a first pretilt angle and the second alignment layer with a second pretilt angle, creating a controlled angular parameter difference that prevents dark texture formation while maintaining overall display performance in the curved panel.
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 approach effectively prevents the generation of dark textures on the screen, maintaining high display quality even in curved LCDs by ensuring precise alignment of liquid crystal molecules.
Implementation Method 1
one panel is exposed to UV and cured at different temperatures to create a distinct pretilt angle
Data Source
AI summary
A liquid crystal display includes a thin film transistor panel including a first alignment layer, an opposing panel including a second alignment layer, and opposite to the thin film transistor panel, and a liquid crystal layer between the thin film transistor panel and the opposing panel, and including liquid crystal molecules, wherein a difference between a pretilt angle provided by the first alignment layer and a pretilt angle provided by the second alignment layer is equal to or greater than about 0.8 degree.