Liquid Crystal Display with Planar Pixel Electrode and Branch Electrodes
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Solution Overview
Problem
Liquid crystal displays face challenges in achieving a balance between wide viewing angle, quick response speed, and high transmittance, particularly due to the reduction in transmittance caused by forming micro-slits in electric field generating electrodes for initial alignment of liquid crystal molecules.
Innovation Solution
A liquid crystal display design featuring a first pixel electrode with a planar shape and a second pixel electrode with branch electrodes, where liquid crystal molecules have different pretilt directions in various domains, and prepolymers are polymerized using ultraviolet rays to align these molecules, improving response speed and transmittance while maintaining a wide viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If micro-slits are formed in the pixel electrode to provide initial alignment of liquid crystal molecules for wide viewing angle, then viewing angle is improved, but transmittance is reduced
Solution Approach 1:
The pixel electrode is divided into multiple branch electrodes extending in different directions. This segmentation creates multiple electric field regions that provide initial alignment of liquid crystal molecules in different directions, achieving wide viewing angle without requiring micro-slits that would block light and reduce transmittance.
2Speed
If liquid crystal molecules are aligned using prepolymers polymerized by ultraviolet rays, then response speed is improved, but manufacturing process complexity increases
Solution Approach 1:
Prepolymers are incorporated into the liquid crystal composition before cell assembly. During the manufacturing process, ultraviolet irradiation polymerizes these prepolymers to form alignment layers that provide initial alignment of liquid crystal molecules. This preliminary action of incorporating prepolymers simplifies the overall manufacturing process compared to forming separate alignment layers, while still achieving fast response speed through effective molecular alignment.
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 enhances the response speed and widens the viewing angle of liquid crystal displays while improving transmittance by evenly forming an electric field with a planar pixel electrode and utilizing branch electrodes to align liquid crystal molecules in different pretilt directions.
Implementation Method 1
polymerizing the prepolymers by radiating ultraviolet rays to the liquid crystal layer to align the liquid crystal molecules in pretilt angles
Implementation Method 2
A liquid crystal display generally includes two substrate panels wherein an electric field is generated by using electrodes such as a pixel electrode and a common electrode
Implementation Method 3
The liquid crystal display generates an electric field in a liquid crystal layer by applying a voltage to the field generating electrodes to align orientations of liquid crystal molecules of the liquid crystal layer and control polarization of incident light
Data Source
AI summary
An exemplary embodiment of the present invention provides a liquid crystal display, including: a first substrate including a first pixel electrode, the first pixel electrode having a planar shape; a second substrate disposed facing the first substrate, including a common electrode disposed on the second substrate; a liquid crystal layer including a plurality of liquid crystal molecules disposed between the first substrate and the second substrate; and a plurality of pixels disposed between the first substrate and the second substrate, each of the plurality of pixels including a plurality of domains, and liquid crystal molecules of the liquid crystal layer disposed in different domains have different pretilt directions.