Liquid Crystal Display Electrode Micro Branches Domain Control
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Solution Overview
Problem
Liquid crystal displays using the super vertical alignment (SVA) mode face challenges in maintaining high transmittance and preventing display defects such as stains and diffraction due to multiple domains within a pixel, which affect image quality.
Innovation Solution
The implementation of a liquid crystal display design featuring a first and second pixel electrode with micro branch portions extending in different directions, along with a control electrode between them, to minimize the number of domains and improve transmittance by controlling the liquid crystal direction and preventing display defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple domains are formed within a pixel using SVA mode with micro slit electrode structure, then liquid crystal direction control is improved, but display defects such as stains and diffraction occur
Solution Approach 1:
The patent extracts the control electrode from the traditional electrode structure and positions it between the pixel electrode and common electrode. This separation allows the control electrode to specifically manage liquid crystal alignment at domain boundaries without interfering with the primary pixel operation, thereby preventing display defects while maintaining direction control capability
Solution Approach 2:
The control electrode acts as an intermediary element between the pixel electrode and common electrode. It mediates the electric field distribution to prevent liquid crystal molecules from forming harmful alignments at domain boundaries, thus eliminating stains and diffraction while preserving the multi-domain structure for viewing angle control
2Adaptability or versatility
If multiple domains are formed within a pixel, then viewing angle is improved, but transmittance decreases due to display defects
Solution Approach 1:
The control electrode is extracted as a separate functional element dedicated to preventing display defects. By positioning it between the pixel and common electrodes, it selectively addresses domain boundary issues without affecting the overall light transmission path, thus maintaining high transmittance while enabling multi-domain viewing angle control
Solution Approach 2:
The control electrode applies localized electric field control specifically at domain boundaries where liquid crystal alignment problems occur. This local intervention prevents stains and diffraction without requiring changes to the entire pixel structure, preserving overall transmittance while achieving viewing angle improvement through controlled domain formation
3Object-generated harmful factors
If control electrode is added between pixel electrode and common electrode, then display defects are prevented, but device complexity increases
Solution Approach 1:
The control electrode is designed to perform multiple functions: it prevents display defects by controlling liquid crystal alignment at domain boundaries, maintains high transmittance by being positioned in a location that doesn't block light paths, and works with existing pixel and common electrodes without requiring fundamental structural changes. This multi-functionality justifies the added complexity
4Adaptability or versatility
If micro branch portions extend in different directions, then liquid crystal alignment is improved, but manufacturing precision requirements increase
Solution Approach 1:
The micro branch portions are designed with asymmetric orientations (first direction for first pixel electrode, second direction for second pixel electrode). This asymmetric design creates complementary electric field patterns that improve liquid crystal alignment across different pixel regions. The control electrode then harmonizes these asymmetric patterns to achieve uniform alignment while reducing the stringency of manufacturing precision requirements
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 design enhances transmittance and reduces display defects by minimizing the number of domains, thereby improving image quality and maintaining a high contrast ratio and wide viewing angle.
Implementation Method 1
The liquid crystal display displays an image by generating an electric field by applying a voltage to the electric field generating electrodes
Implementation Method 2
changing the alignment of liquid crystal molecules included in the liquid crystal layer, and controlling polarization of incident light
Implementation Method 3
the long axes of liquid crystal molecules in the liquid crystal layer are arranged to be vertical relative to the display panels in a state in which an electric field is not applied
Data Source
AI summary
A liquid crystal display includes a first substrate, a first pixel and a second pixel vertically or horizontally disposed on the first substrate, a second substrate facing the first substrate, a liquid crystal layer including a plurality of liquid crystal molecules and disposed between the first and second substrates, and a first control electrode disposed between the first and second pixel electrodes. The first pixel includes a first pixel electrode, and the second pixel includes a second pixel electrode. The first pixel electrode includes a first plurality of micro branch portions extending in a first direction, and the second pixel electrode includes a second plurality of micro branch portions extending in a second direction. The first direction is different from the second direction.