Multi-domain Vertical Alignment LCD Sub-pixel Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional multi-domain vertical alignment (MVA) LCDs can only compensate visual performance in four viewing directions, which is insufficient for achieving uniform display across a wider range of angles, particularly in larger displays like monitors and televisions.
Innovation Solution
The introduction of additional data lines and pixel electrodes on the second substrate, allowing each pixel region to be divided into sub-pixel units with different voltage configurations, resulting in eight domains of liquid crystal molecule alignment, thereby enhancing display uniformity across more viewing directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional MVA LCD structure with four domains is used, then device complexity is low, but display uniformity across viewing directions is insufficient
Solution Approach 1:
The patent divides each pixel into multiple sub-pixels (first sub-pixel and second sub-pixel) with different voltage configurations, creating eight distinct domains instead of four. This segmentation allows independent control of liquid crystal orientations in different regions, achieving uniform display performance across more viewing directions while managing complexity through systematic subdivision
Solution Approach 2:
The patent applies different voltage signals to different sub-pixel regions within the same pixel, creating locally optimized liquid crystal alignments. The first and second data lines provide different voltages to first and second sub-pixels respectively, enabling each local region to be optimized for specific viewing angles while maintaining overall display uniformity
2Illumination intensity
If additional data lines and pixel electrodes are introduced to create eight domains, then brightness and contrast uniformity across viewing angles is improved, but device complexity increases
Solution Approach 1:
The introduction of additional data lines (first and second data lines) and corresponding pixel electrodes divides each pixel into multiple sub-pixels, creating eight domains total. This segmentation enables independent voltage control for each sub-pixel, achieving uniform brightness and contrast across different viewing angles by optimizing liquid crystal alignment in each domain
Solution Approach 2:
The additional data lines and pixel electrodes serve multiple functions: they provide different voltage configurations to different sub-pixels, enable eight-domain alignment control, and maintain compatibility with existing LCD architecture. This multi-functionality achieves improved viewing angle performance without requiring completely new display technologies
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 achieves an 8-domain vertical alignment, providing improved brightness and contrast uniformity across a broader range of angles, addressing the limitations of conventional MVA LCDs by ensuring consistent image quality regardless of the viewing direction.
Implementation Method 1
Liquid crystal molecules of the pixel are vertically aligned when no voltage is applied
Implementation Method 2
the light beams transmit along the long axes of the liquid crystal molecules 131, after the linearly-polarized light beams pass through the liquid crystal layer 130, the polarizing directions of the linearly-polarized light beams remain unchanged
Implementation Method 3
voltage differences between the common electrode 115 and pixel electrodes 127 generate electric fields perpendicular to the first and second substrates 110, 120. Because the liquid crystal molecules 131 have negative dielectric anisotropy, they are inclined to become oriented parallel to the first substrate 110
Implementation Method 4
the protrusions 141, 142 affect the orientations of the liquid crystal molecules 131, such that the liquid crystal molecules 131 form inclined alignments perpendicular to the slopes of the protrusions 141, 142
Implementation Method 5
Because of birefringence of the liquid crystal molecules 131 and the electric fields, the polarizing directions of the linearly-polarized light beams change to align with the polarizing axis of the upper polarizer 112 after passing through the liquid crystal layer 130
Data Source
AI summary
An exemplary liquid crystal display includes a first substrate; a second substrate opposite the first substrate; a liquid crystal layer interposed between the first and second substrates; a plurality of pixel electrodes disposed at the second substrate; a plurality of parallel first data lines alternately disposed at the second substrate; a plurality of parallel second data lines alternately disposed at the second substrate. Each of the first data lines is disposed upon and insulative to a corresponding second data line, and each of the first and second data lines provides signals to a corresponding pixel electrode.