Chiral Liquid Crystal Display With Multidomain Pretilt Angle
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Solution Overview
Problem
Conventional liquid crystal displays with multi-domain alignment structures face issues such as loss of transmission, low aperture ratio, color washout, and grayscale inversion, which are not effectively addressed by the conventional rubbing alignment method and auxiliary alignment devices.
Innovation Solution
A liquid crystal display with a substrate configuration featuring flat electrodes and alignment layers, where the liquid crystal layer has chirality and a multidomain pretilt angle is achieved through a process involving the formation of sub-pixel electrode regions with oblique field effects and controlled voltage applications, eliminating the need for auxiliary alignment devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rubbing alignment method is used, then alignment structure is formed, but transmission loss and low aperture ratio occur
Solution Approach 1:
The patent extracts and eliminates the rubbing alignment layer and auxiliary alignment devices from the display structure, replacing them with a self-aligned electrode configuration where the electrode pattern itself defines the alignment domains, thereby removing the source of transmission loss while maintaining alignment functionality
Solution Approach 2:
The patent replaces the mechanical rubbing alignment method with an electric field-based alignment mechanism, where the electrode geometry and applied voltage create oblique electric fields that directly orient the liquid crystal molecules without physical contact, eliminating the need for rubbing layers and improving transmission
2Reliability
If auxiliary alignment devices are used, then multi-domain alignment is achieved, but device complexity increases
Solution Approach 1:
The patent makes the flat electrode perform multiple functions: it serves as both the driving electrode for liquid crystal switching and the alignment structure for defining multi-domain patterns, eliminating the need for separate auxiliary alignment devices while achieving the same alignment效果
Solution Approach 2:
The electrode structure is designed to self-align the liquid crystal domains through its geometric configuration and electric field distribution, without requiring external auxiliary devices, thereby simplifying the overall device structure while maintaining multi-domain alignment capability
3Reliability
If conventional alignment method is used, then alignment is formed, but color washout and grayscale inversion occur
Solution Approach 1:
The patent creates different pretilt angles in different regions of the electrode structure, with the center region having a first pretilt angle and the peripheral region having a second pretilt angle, which locally optimizes the alignment to prevent color washout and grayscale inversion while maintaining overall alignment quality
Solution Approach 2:
The patent changes the alignment parameters (pretilt angles) in different spatial regions of the liquid crystal layer, creating a gradient from the center to the periphery, which compensates for viewing angle-dependent effects and prevents color washout and grayscale inversion across different viewing conditions
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 the viewing angle of the LCD by achieving continuous domain alignment without singular points, improving transmission and aperture ratio while preventing color washout and grayscale inversion.
Implementation Method 1
the liquid crystal layer has chirality
Implementation Method 2
the sub-pixel electrode region has a multidomain pretilt angle
Data Source
AI summary
The invention provides a liquid crystal display, including: a substrate, wherein the substrate includes a first flat electrode formed thereon; a first alignment layer formed on the first flat electrode; a second substrate disposed oppositely to the first substrate, wherein the second substrate includes a gate line, a data line and a second flat electrode, wherein the gate line intersects with the data line to define a pixel region, the pixel region includes at least one sub-pixel electrode region, and an area of the second flat electrode is smaller than that of the first flat electrode; a second alignment layer formed on the second flat electrode; and a liquid crystal layer formed between the first substrate and the second substrate, wherein the liquid crystal layer has chirality, wherein the sub-pixel electrode region has a multidomain pretilt angle.