Dual-Layer LCD With Intersecting Pixel Domains
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Solution Overview
Problem
Liquid crystal displays (LCDs) using two liquid crystal layers face challenges in maintaining good transmittance and minimizing brightness deviation when viewed from different directions, particularly in vertical alignment mode LCDs, which can affect contrast ratio and overall display quality.
Innovation Solution
The implementation of an LCD structure with overlapping first and second display panels, each having pixels with distinct domain directions for their respective liquid crystal layers, allowing for controlled transmittance and reduced brightness deviation across viewing angles by intersecting the domain directions of the first and second pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two liquid crystal layers are used to improve contrast ratio, then contrast ratio is improved, but transmittance decreases
Solution Approach 1:
The patent applies different domain directions to different pixels: first pixels have a first domain direction and second pixels have a second domain direction that is different from the first. This local differentiation allows each pixel type to optimize its light transmission characteristics, thereby improving overall transmittance while maintaining the contrast ratio enhancement provided by the dual liquid crystal layer structure.
2Reliability
If two liquid crystal layers are used to improve contrast ratio, then contrast ratio is improved, but brightness deviation according to viewing direction increases
Solution Approach 1:
The patent introduces different domain directions for first and second pixels to create localized optical characteristics that compensate for viewing angle-dependent brightness variations. By having pixels with different domain orientations, the display achieves more uniform brightness perception across various viewing directions while preserving the high contrast ratio.
Solution Approach 2:
The patent employs asymmetric domain configuration where first pixels and second pixels have different domain directions rather than uniform symmetry. This asymmetry in domain arrangement helps to balance the optical properties across different viewing angles, reducing the brightness deviation that typically occurs in vertical alignment mode LCDs when viewed from oblique directions.
3Ease of manufacture
If vertical alignment mode is used, then liquid crystal alignment is simplified, but brightness recognition varies according to viewing direction
Solution Approach 1:
While maintaining the simple vertical alignment mode for manufacturing ease, the patent introduces local quality variations by assigning different domain directions to different pixels. This allows the vertically aligned liquid crystals to be manufactured simply while achieving improved brightness consistency through the differentiated pixel domain configurations.
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 configuration enhances transmittance and minimizes brightness deviation across viewing directions, thereby improving the contrast ratio and overall display quality of LCDs, even when using two liquid crystal layers.
Implementation Method 1
display images by applying a voltage to the electric field generating electrodes to form an electric field in the liquid crystal layer, thereby determining an alignment of liquid crystals included in the liquid crystal layer and controlling polarization of incident light
Implementation Method 2
applying a voltage to the electric field generating electrodes to form an electric field in the liquid crystal layer, thereby determining an alignment of liquid crystals
Data Source
AI summary
A liquid crystal display including a first substrate on which a plurality of first pixels are defined, a first pixel electrode arranged for each of the first pixels on the first substrate, a second substrate arranged opposite the first substrate, a third substrate arranged on the second substrate and on which a plurality of second pixels are defined, a second pixel electrode arranged for each of the second pixels on the third substrate, and a fourth substrate arranged opposite the third substrate. Each of the first pixels has a first domain and each of the second pixels has a second domain, and a direction of the first domain of the first pixels and a direction of the second domain of the second pixels are different from each other.