MVA-LCD Pixel Structure with Mirror-Image Sub-Pixel Domains
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Solution Overview
Problem
Conventional multi-domain vertical alignment liquid crystal displays suffer from uneven display quality, color shift, and issues like image retention and low response speed due to unequal azimuthal angle domains and alignment errors.
Innovation Solution
A mirror-image arrangement of adjacent sub-pixels with equal azimuthal and polar angle domains, controlled by protrusions and slits on substrates, ensures equal area ratios and self-compensation, using capacitive coupling and charge releasing devices to maintain uniform display quality across viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the protrusion and slit are staggered arranged to create multiple azimuthal angle domains, then the viewing angle is increased, but the azimuthal angle domains become unequal in area causing color washout and gray scale inversion
Solution Approach 1:
The patent introduces a compensation domain with asymmetric area relative to the protrusion, specifically designed to balance the total area of azimuthal angle domains on opposite sides. The compensation domain is positioned adjacent to the protrusion and has an area that compensates for the unequal distribution caused by the staggered arrangement, ensuring that the sum of areas in symmetric domains equals the sum of areas in opposite domains.
2Manufacturing precision
If the protrusion position is altered to equalize azimuthal angle domain areas in a single sub-pixel, then color washout is reduced, but image retention and low response speed occur due to unstable disconnection lines
Solution Approach 1:
The patent combines the compensation domain with adjacent functional domains to form an integrated structure. The compensation domain is merged with the protrusion and surrounding domains to create a unified electrode configuration that maintains both area equality and stable disconnection lines, preventing image retention while achieving uniform domain distribution.
3Manufacturing precision
If the azimuthal angle domains are made equal in area by altering protrusion position, then color washout is ameliorated, but gray scale inversion occurs due to alignment errors
Solution Approach 1:
The patent applies different geometric characteristics to different regions: the compensation domain has specific area properties to balance overall domain distribution, while the protrusion maintains optimized dimensions and positioning to ensure proper alignment. This localized optimization of geometric parameters in different regions simultaneously achieves area equality and minimizes alignment errors that cause gray scale inversion.
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 approach achieves uniform display quality and reduces issues like gray scale inversion and image retention, ensuring excellent viewing angle performance with equal domain areas and improved optical characteristics.
Implementation Method 1
dividing liquid crystal into multi-domains where liquid molecules are in various declination directions
Implementation Method 2
The protruding portion and conductive electrode with a slit are disposed respectively on upper and lower substrates, opposing a liquid crystal layer between the substrates, thus the liquid crystal molecules have a pre-tilt angle
Data Source
AI summary
A pixel structure for a multi-domain vertical alignment liquid crystal display (MVA-LCD) is disclosed. The pixel structure includes a pixel array having a plurality of adjacently arranged sub-pixels; and a first substrate and a second substrate having, respectively, first and second means for controlling tilt angles of liquid crystal molecules between the first and second substrates. The first and second means are alternately disposed to define each of the sub-pixels into a plurality of different azimuthal angle domains. Moreover, each of the sub-pixels also is further defined into at least two different polar angle domains. The azimuthal angle domains and polar angle domains of two adjacent sub-pixels have a mirror-image arrangement.