Planar Pixel Electrode PSVA LCD Panel Design
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Solution Overview
Problem
Conventional polymer stabilized vertical alignment (PSVA) liquid crystal display panels face issues with non-uniform transmittance and brightness due to patternization of the pixel electrode, leading to reduced maximum transmittance and increased backlighting brightness requirements, which in turn increase cost and power consumption.
Innovation Solution
A high transmittance PSVA liquid crystal display panel design featuring a planar pixel electrode and a patternized common electrode, with polymer projections formed through UV polymerization, allowing for uniform pre-tilt angles of liquid crystal molecules and simultaneous maximum transmittance across the entire pixel area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a patternized pixel electrode is used in PSVA liquid crystal display panels, then multi-domain vertical alignment is achieved improving wide view angle characteristics, but transmittance becomes non-uniform and maximum transmittance is reduced
Solution Approach 1:
The patent inverts the conventional design by making the common electrode patternized instead of the pixel electrode. The common electrode is divided into multiple zones with different orientations, while the pixel electrode remains planar. This inversion allows the liquid crystal molecules to be tilted in different directions through the patternized common electrode, achieving multi-domain vertical alignment and wide view angle characteristics without compromising the uniformity and maximum transmittance of the pixel electrode area.
2Stability of the object's composition
If a patternized pixel electrode is used, then liquid crystal molecules tilt in different directions, but the entire pixel area cannot simultaneously achieve maximum transmittance
Solution Approach 1:
The patent segments the common electrode into multiple zones, where each zone has a different orientation. This segmentation allows the electric field to be oriented differently in different regions, causing liquid crystal molecules to tilt in different directions for wide view angle characteristics, while the overall pixel electrode remains planar to maintain uniform transmittance across the entire pixel area.
3Device complexity
If non-uniform transmittance is accepted, then patternized pixel electrode can be used, but backlighting brightness requirements increase
Solution Approach 1:
By inverting the design and making the common electrode patternized rather than the pixel electrode, the patent achieves multi-domain alignment while maintaining uniform transmittance. This eliminates the need for increased backlighting brightness, thereby reducing power consumption of the backlight unit while preserving the wide view angle characteristics.
4Adaptability or versatility
If patternized pixel electrode is used, then MVA technology is achieved, but cost increases due to higher backlighting requirements
Solution Approach 1:
The patent inverts the conventional MVA design by patternizing the common electrode instead of the pixel electrode. This approach maintains the multi-domain vertical alignment capability while preserving uniform transmittance, thereby eliminating the need for expensive high-brightness backlighting units and reducing overall manufacturing cost.
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 achieves homogeneous brightness and reduced backlighting requirements, lowering the cost and power consumption of the PSVA liquid crystal display panel by ensuring the entire pixel area reaches maximum transmittance, overcoming the limitations of prior art.
Implementation Method 1
a mixture of liquid crystal molecules and polymerizable monomers is filled between the second common electrode and the pixel electrode; applying a voltage to the pixel electrode and the patternized common electrode; applying UV light irradiation to cause polymerization of the polymerizable monomers to form polymer projections
Implementation Method 2
a liquid crystal layer interposed between the second common electrode and the pixel electrode; polymer projections align liquid crystal molecules contained in the liquid crystal layer so as to set the liquid crystal molecules at predetermined pre-tilt angles
Implementation Method 3
applying a voltage to the pixel electrode and the patternized common electrode to cause the liquid crystal molecules to tilt in various directions along spacing slits so as to form multiple domains in each of the sub-pixels
Data Source
AI summary
A liquid crystal display panel includes an upper substrate on which a first common electrode, an insulation layer, and a second common electrode are formed, a lower substrate on which a pixel electrode is formed, and a plurality of polymer projections formed on surfaces of the second common electrode and the pixel electrode to align liquid crystal molecules. One of the first and second common electrodes is a patternized common electrode and the other is a planar common electrode. The pixel electrode is a planar electrode. In a manufacturing process, a voltage is applied to the pixel electrode and the patternized common electrode to cause the liquid crystal molecules to tilt so as to form multiple domains in each of sub-pixels. In a regular operation, a voltage is applied to the pixel electrode and the planar common electrode to make the entire pixel area to simultaneously achieve the maximum transmittance.