Discotic Liquid Crystal Layer for PVA LCD Phase Retardation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Patterned vertical alignment mode (PVA) LCDs face a reduced aperture ratio due to the patterned transparent electrode, which affects display quality and viewing angle.
Innovation Solution
A display apparatus with a pixel electrode having a plurality of branches and alignment sections, featuring an auxiliary liquid crystal layer made of discotic liquid crystals that compensates for phase retardation, and a main liquid crystal layer with vertical alignment, along with a common electrode to apply an electric field, improving light transmission and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a patterned transparent electrode is used in PVA LCD to improve viewing angle, then viewing angle is improved, but aperture ratio is reduced
Solution Approach 1:
The pixel electrode is divided into multiple branches instead of using a continuous patterned electrode. This segmentation allows light to pass through the gaps between branches, maintaining aperture ratio while still creating the necessary alignment sections for improved viewing angle in PVA LCDs.
2Manufacturing precision
If additional retardation films are added to compensate for phase retardation, then display quality is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The pixel electrode branches themselves serve dual functions: they create alignment sections for viewing angle improvement and simultaneously compensate for phase retardation effects. This self-service approach eliminates the need for additional retardation films, reducing device complexity while maintaining display quality.
3Manufacturing precision
If additional retardation films are added to compensate for phase retardation, then display quality is improved, but manufacturing cost increases
Solution Approach 1:
The pixel electrode branches serve dual functions including phase retardation compensation, eliminating the need for additional retardation films and reducing manufacturing steps. This self-service mechanism lowers material costs and simplifies the manufacturing process while maintaining display quality.
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 display quality by effectively compensating for phase retardation and reducing light leakage, thereby improving the contrast ratio and viewing angle without the need for additional retardation films, thus simplifying manufacturing and reducing costs.
Implementation Method 1
An auxiliary liquid crystal layer is formed on the pixel electrode and the alignment sections and includes discotic liquid crystals
Implementation Method 2
A main liquid crystal layer having a vertical alignment mode is formed on the auxiliary liquid crystal layer
Implementation Method 3
A common electrode is formed on the main liquid crystal layer to apply an electric field to the main liquid crystal layer together with the pixel electrode
Data Source
AI summary
A method of manufacturing a display apparatus. The liquid crystal display includes a first substrate and a pixel electrode formed on the first substrate and having a plurality of branches. A plurality of alignment sections are interposed among the branches. An auxiliary liquid crystal layer having discotic liquid crystals is formed on the pixel electrode and the alignment sections. A main liquid crystal layer having a vertical alignment mode is formed on the auxiliary liquid crystal layer. A common electrode is formed on the main liquid crystal layer to apply an electric field to the main liquid crystal layer together with the pixel electrode. A second substrate is formed on the common electrode.