Liquid Crystal Display Panel Slit Electrode Domain Alignment
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Solution Overview
Problem
Vertical alignment type liquid crystal displays suffer from misalignments in liquid crystal molecules between alignment films, leading to reduced side viewing angle and pixel response speed.
Innovation Solution
A liquid crystal display panel design featuring sub-pixels with different voltage levels and alignment directions, including slits in the sub-pixel electrodes to align liquid crystals, forming domains that enhance side visibility and response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If liquid crystal molecules are aligned using alignment films with rubbing or light alignment method, then the liquid crystal display can be manufactured, but misalignments occur in no electric field state reducing side viewing angle and pixel response speed
Solution Approach 1:
The pixel electrode is divided into multiple domains (first domain and second domain) with different alignment directions. Each domain has liquid crystal molecules aligned in specific directions (e.g., first direction and second direction that are not parallel), creating a multi-domain structure that compensates for misalignment effects and improves side viewing angle and response speed.
Solution Approach 2:
Different regions (domains) of the pixel electrode are given different alignment characteristics. The first domain has liquid crystal molecules aligned in a first direction while the second domain has molecules aligned in a second direction, allowing each local region to optimize performance for different viewing angles and eliminate misalignment issues.
2Reliability
If sub-pixels are charged with different voltage levels, then gamma value differences between color pixels are reduced, but the device complexity increases
Solution Approach 1:
Different voltage levels are applied to different sub-pixels (first sub-pixel receives first voltage level, second sub-pixel receives second voltage level). This parameter change compensates for the different light emission characteristics of different color pixels (Red, Green, Blue), reducing gamma value differences and achieving more uniform display performance across all colors.
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 design improves side visibility and pixel response speed by aligning liquid crystals effectively across domains, reducing differences in gamma values between color pixels and enhancing overall display performance.
Implementation Method 1
a first alignment layer disposed on the first substrate and aligned in a first direction and a second direction in each of the first and second sub-pixels
Implementation Method 2
a liquid crystal layer disposed between the first alignment layer and the second alignment layer
Data Source
AI summary
A liquid crystal display panel including pixels, wherein at least one of the pixels includes a first sub-pixel charged with a first voltage and a second sub-pixel charged with a second voltage lower than the first voltage, a first substrate including a first sub-pixel electrode of the first sub-pixel and a second sub-pixel electrode of the second sub-pixel, a first alignment layer aligned in first and second directions in each of the first and second sub-pixels, a second alignment layer aligned in third and fourth directions in each of the first and second sub-pixels to form a plurality of domains in each of the first and second sub-pixels, and a liquid crystal layer disposed between the first and second alignment layers, wherein the first sub-pixel electrode includes a plurality of slits formed substantially parallel to a liquid crystal alignment direction in each of the domains of the first sub-pixel electrode.