Vertical Alignment LCD Pixel Electrode Segmentation for Wide Viewing Angle
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Solution Overview
Problem
Current vertical alignment liquid crystal displays suffer from significant view angle color deviation and contrast reduction, particularly at large viewing angles, limiting their application in high-end fields where wide viewing angles are critical.
Innovation Solution
The display incorporates a unique arrangement of thin film transistors and electrode lines, where sub pixel regions have two thin film transistors to divide the driving voltage and main pixel regions have a single transistor to apply the full voltage, enhancing luminance and neutralizing brightness differences between areas to reduce color deviation and improve contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If vertical alignment mode is used to achieve high front contrast, then contrast is improved, but viewing angle is limited
Solution Approach 1:
The pixel electrode is divided into multiple regions with different electrode line arrangements. Specifically, the pixel electrode includes a first region with first electrode lines extending in a first direction and a second region with second electrode lines extending in a second direction different from the first direction. This segmentation allows different regions to control liquid crystal molecules in different orientations, enabling both high contrast and wide viewing angle simultaneously.
Solution Approach 2:
Different regions of the pixel electrode are designed with different electrode line directions to create local variations in liquid crystal alignment. The first region has electrode lines in a first direction while the second region has electrode lines in a second direction, creating locally optimized optical properties in each region that collectively improve overall display performance across different viewing angles.
2Adaptability or versatility
If multi-domain vertical alignment is used to expand viewing angle, then viewing angle is improved, but contrast is reduced
Solution Approach 1:
The pixel electrode is divided into multiple regions with different electrode line arrangements. Specifically, the pixel electrode includes a first region with first electrode lines extending in a first direction and a second region with second electrode lines extending in a second direction different from the first direction. This segmentation allows different regions to control liquid crystal molecules in different orientations, enabling both high contrast and wide viewing angle simultaneously.
Solution Approach 2:
Different regions of the pixel electrode are designed with different electrode line directions to create local variations in liquid crystal alignment. The first region has electrode lines in a first direction while the second region has electrode lines in a second direction, creating locally optimized optical properties in each region that collectively improve overall display performance across different viewing angles.
3Adaptability or versatility
If IPS mode is used to achieve wide viewing angle, then viewing angle is improved, but contrast is reduced
Solution Approach 1:
The pixel electrode is divided into multiple regions with different electrode line arrangements. Specifically, the pixel electrode includes a first region with first electrode lines extending in a first direction and a second region with second electrode lines extending in a second direction different from the first direction. This segmentation allows different regions to control liquid crystal molecules in different orientations, enabling both high contrast and wide viewing angle simultaneously.
Solution Approach 2:
Different regions of the pixel electrode are designed with different electrode line directions to create local variations in liquid crystal alignment. The first region has electrode lines in a first direction while the second region has electrode lines in a second direction, creating locally optimized optical properties in each region that collectively improve overall display performance across different viewing angles.
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 effectively reduces view angle color deviation and enhances contrast, particularly at large angles like 70 degrees, by ensuring consistent and improved luminance across the display.
Implementation Method 1
the liquid crystal layer comprises a plurality of liquid crystal molecules, and the liquid crystal molecules are rotated under action of an electric field generated by the pixel electrode and the common electrode
Implementation Method 2
the display further comprises a first polarization film and a second polarization film which are respectively arranged on the front side and the rear side of the liquid crystal layer
Data Source
AI summary
Provided is a vertical alignment liquid crystal display, comprising a plurality of data lines, a plurality of scan lines and a plurality of common electrode lines; the scan lines intersect the data lines and the common electrode lines to form a plurality of pixel regions arranged in an array; the sub pixel region comprises a first thin film transistor, a second thin film transistor and a sub pixel, and gates of the first thin film transistor and second thin film transistor are coupled to a same scan line, and drains of the first thin film transistor and second thin film transistor are respectively coupled to a data line and a common electrode line which are adjacent, and sources of the first thin film transistor and second thin film transistor are coupled to the sub pixel; the main pixel region comprises a third thin film transistor and a sub pixel.