MVA Liquid Crystal Display with UV-Cured Alignment Layer
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Solution Overview
Problem
Liquid crystal display devices of the MVA mode suffer from gradation viewing angle characteristics issues, where transmittance varies significantly when viewed from different angles, leading to chromaticity deviations between front and tilted directions.
Innovation Solution
A liquid crystal display device with a structural pattern on at least one substrate, featuring regions of different threshold voltages and a second alignment control layer formed using ultraviolet-cured products, where the pre-tilted angle of liquid crystal molecules is between 86° and 90°, and the structural pattern is designed to tilt liquid crystals in specific directions when a voltage is applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a liquid crystal display device of the MVA mode is used to improve viewing angle characteristics, then the viewing angle characteristics are greatly improved, but gradation viewing angle characteristics deteriorate due to significant transmittance variation when viewed from different angles
Solution Approach 1:
The patent applies local quality by creating regions with different threshold voltages within the display panel. Specifically, a first region with a first threshold voltage and a second region with a second threshold voltage different from the first are formed. This allows different local areas to have optimized characteristics for their specific functions, thereby improving overall gradation viewing angle characteristics while maintaining the MVA mode's viewing angle advantages
Solution Approach 2:
The patent changes the threshold voltage parameter across different regions of the display panel. By forming regions with different threshold voltages (first threshold voltage in the first region, second threshold voltage in the second region), the patent optimizes the transmittance-voltage characteristics to reduce gradation inversion and improve viewing angle performance
2Manufacturing precision
If regions with different threshold voltages are formed to improve gradation viewing angle characteristics, then chromaticity deviations are reduced, but device complexity increases
Solution Approach 1:
The patent segments the display panel into distinct regions (first region and second region) with different threshold voltages. This segmentation allows for optimized performance in each region while managing the overall complexity through a structured approach to region definition and voltage differentiation
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 improves gradation viewing angle characteristics by averaging transmittance-voltage characteristics across regions, reducing chromaticity deviations and enhancing display quality, while also increasing response speed and maintaining high brightness.
Implementation Method 1
a second alignment control layer of an ultraviolet ray-cured product is formed after the liquid crystal layer is held between the pair of substrates
Implementation Method 2
a liquid crystal material having a negative dielectric anisotropy is vertically aligned and the directions of tilt of liquid crystal molecules are limited by protrusions formed on the surface of the substrate and slits formed therein when a voltage is applied
Data Source
AI summary
A vertically aligned liquid crystal display device such as of the MVA mode and a method of manufacturing the same featuring favorable viewing angle characteristics. The liquid crystal display device includes an electrode formed on at least one substrate of a pair of substrates to apply a voltage to the liquid crystal molecules, a first alignment control layer for vertically aligning the liquid crystal molecules and a liquid crystal layer that are held between the pair of substrates, and a second alignment control layer of an ultraviolet ray-cured product formed after the liquid crystal layer is held between the pair of substrates, wherein the second alignment control layer is so formed that there exist two or more regions of different threshold voltages in each display pixel, at least one region has a threshold voltage higher than a threshold voltage produced by the first alignment control layer, and a pre-tilted angle θp of not smaller than 86° but smaller than 90° is possessed by all regions.