MVA LCD Pixel Segmentation for Viewing Angle Optimization
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Solution Overview
Problem
MVA liquid crystal displays suffer from degraded viewing angle characteristics, leading to images appearing whitish in oblique directions due to significant differences in transmittance between square and oblique directions, which affects display quality.
Innovation Solution
A liquid crystal display design featuring substrates with alignment regulating structures having different threshold voltages by varying the intervals between protrusions and slits, allowing for areas with distinct threshold voltages within a single pixel, thereby improving viewing angle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alignment regulating structures with uniform intervals are used in MVA-LCD, then the liquid crystal molecules can be tilted in four directions to achieve multi-domain vertical alignment, but transmittance in oblique direction increases significantly when voltage slightly exceeds threshold voltage, causing images to appear whitish and degrading viewing angle characteristics
Solution Approach 1:
The patent divides each pixel into multiple regions with different alignment regulating structure intervals. Specifically, the pixel is divided into a first region with a first interval between protrusions and a second region with a second interval different from the first interval. This creates local variations in threshold voltage across the pixel, allowing different regions to have different transmittance characteristics that compensate for each other when viewed from oblique directions, thereby improving overall viewing angle characteristics while suppressing excessive transmittance increases
2Reliability
If a single threshold voltage is used for the entire pixel, then the structure is simple and easy to manufacture, but transmittance characteristics differ significantly between square direction and oblique direction, leading to poor viewing angle performance
Solution Approach 1:
The patent segments each pixel into multiple regions with different alignment regulating structure intervals. Each region has its own threshold voltage characteristic, creating a multi-threshold voltage pixel structure. This segmentation allows the pixel to exhibit different transmittance behaviors in different viewing directions, improving viewing angle characteristics while maintaining compatibility with existing manufacturing processes
Solution Approach 2:
Different regions within the pixel are assigned different local properties through varying the intervals between protrusions. The first region has a first interval and the second region has a second interval, creating local quality variations that result in different threshold voltages and transmittance characteristics for each region, thereby improving overall viewing angle performance
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 effectively suppresses transmittance increases in oblique directions, enhancing display quality by maintaining consistent gradation and reducing the whitish appearance when viewed from different angles.
Implementation Method 1
alignment regulating structures formed on a substrate surface for regulating the alignment of the liquid crystal
Implementation Method 2
When a voltage is applied, the liquid crystal molecules are aligned in a predetermined direction that is regulated by alignment regulating structures
Data Source
AI summary
A liquid crystal display including a pair of substrates, with a liquid crystal sealed therebetween. A plurality of gate bus lines and a plurality of drain bus lines are provided on one of the substrates, along with a pixel electrode, which includes first and second sub-pixel electrodes. A common electrode is provided on the other substrate. The first sub-pixel electrode is electrically connected to a first of the drain bus lines via a TFT. There is also a storage capacitor bus line that overlaps the first sub-pixel electrode, but does not overlap the second sub-pixel electrode, and an electrode that overlaps the storage capacitor bus line and the first sub-pixel electrode at a location where the storage capacitor bus line overlaps the first sub-pixel electrode, as well as a connection line that connects the electrode to the second sub-pixel electrode and has a portion overlapping the first sub-pixel electrode.