Liquid Crystal Display Panel with Segmented Alignment Layers
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Solution Overview
Problem
Liquid crystal display apparatuses face issues with side visibility, particularly in the horizontal direction, and are prone to black afterimages due to residual DC in the alignment layer, which affects display quality.
Innovation Solution
A display panel design with a lower substrate and upper substrate, including a liquid crystal layer with domains and texture areas, where the pretilted angles of the alignment layers are strategically controlled to enhance side visibility and reduce afterimages, using a method involving specific masks to align the liquid crystal, forming horizontal and vertical domain boundary texture areas with varying inclinations and widths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pretilted angle of the alignment layer is increased to improve liquid crystal alignment, then the alignment quality is improved, but black afterimages occur due to residual DC in the alignment layer
Solution Approach 1:
The patent divides the alignment layer into multiple domains with different pretilted angles. Specifically, it creates a first domain with a first pretilted angle and a second domain with a second pretilted angle that is smaller than the first. This segmentation allows the system to achieve good alignment quality in the first domain while reducing residual DC and black afterimages in the second domain, thus resolving the contradiction between alignment quality and afterimage prevention.
2Manufacturing precision
If the liquid crystal alignment is optimized for vertical direction, then vertical display quality is improved, but horizontal side visibility deteriorates
Solution Approach 1:
The patent applies different pretilted angles to different spatial regions of the alignment layer. The first domain has a larger pretilted angle optimized for vertical display quality, while the second domain has a smaller pretilted angle that improves horizontal side visibility. This local differentiation of alignment properties allows the display to achieve good performance in both vertical and horizontal directions simultaneously, resolving the contradiction between vertical display quality and horizontal side visibility.
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 improves side visibility and reduces black afterimages, thereby enhancing the display quality of the liquid crystal display apparatus by optimizing the alignment of the liquid crystal domains and texture areas.
Implementation Method 1
A light alignment technique in which the liquid crystal is aligned by emitting a polarized ultraviolet ray to the alignment layer has been developing. When the polarized ultraviolet ray is incident into the alignment layer, a light reactor of the alignment layer forms a pretilted angle.
Implementation Method 2
An alignment of a liquid crystal in the liquid crystal layer is controlled so that the display apparatus displays an image.
Data Source
AI summary
A display panel includes a lower substrate, an upper substrate and a liquid crystal layer. The liquid crystal layer includes a plurality of domains, a horizontal domain boundary texture area and a vertical domain boundary texture area. The domains are disposed in a matrix shape. The horizontal domain boundary texture area extends in a first direction in a boundary between the domains adjacent to each other in a second direction and has a slope of a liquid crystal slowly (e.g., less) inclined compared to that of the domains. The vertical domain boundary texture area extends in the second direction in a boundary between the domains adjacent to each other in the first direction and has a width larger than that of the horizontal domain boundary texture area.