Liquid Crystal Display Sub-Pixel Alignment for Viewing Angle
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Solution Overview
Problem
Conventional liquid crystal displays with TN and MVA systems face challenges in achieving satisfactory viewing angle characteristics, leading to deviations in gradation luminance when viewed from oblique directions, resulting in reduced luminance and color accuracy.
Innovation Solution
A liquid crystal display design featuring a pixel structure with divided pixel electrodes and a unique alignment regulating structure, where the arrangement interval and height of alignment protrusions differ between sub-pixels, allowing for optimized voltage application and improved response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional vertical alignment system is used, then the liquid crystal molecules are vertically aligned on the substrate, but the optical characteristic measured from an oblique direction is largely different from the optical characteristic in the normal line direction
Solution Approach 1:
The pixel electrode is divided into two separate pixel electrodes that are electrically insulated from each other. One pixel electrode is connected to the source electrode while the other is insulated, creating separate control regions that can independently regulate liquid crystal alignment in different areas of the pixel, thereby improving optical consistency across viewing angles
Solution Approach 2:
Different regions of the pixel are provided with different electrode configurations and alignment conditions. The pixel electrode connected to the source electrode and the insulated pixel electrode create locally optimized alignment patterns that compensate for viewing angle deviations in specific directions
2Manufacturing precision
If the gradation luminance characteristic is improved in oblique directions, then the display quality is enhanced, but the response speed may be affected
Solution Approach 1:
The invention optimizes parameters such as the arrangement interval and height of the alignment protrusions to achieve a balance between gradation luminance characteristic and response speed. By carefully controlling these geometric parameters, the system achieves improved optical performance without excessive response time penalty
Data Source
AI summary
The present invention relates to a liquid crystal display, which is used for a display section of an electronic apparatus, and it is an object thereof is to provide a liquid crystal display having an excellent display characteristic. The liquid crystal display has a TFT substrate and an opposite substrate, which are provided opposite to the surface thereof and a liquid crystal layer, which is sealed between the both substrates. A pixel range, which is defined by a gate bus line and a drain bus line and is disposed on the TFT substrate, has a sub-pixel A to which a gradation voltage for driving the liquid crystal layer is applied, and a sub-pixel. B which is formed separated from the sub-pixel A and to which a voltage lower than the gradation voltage is applied. On the opposite substrate, linear protrusions are formed so as to regulate the direction of alignment of a liquid crystal molecular of the liquid crystal layer. An arrangement interval w1 (=w1a) of the linear protrusion within the sub-pixel A is formed so as to be shorter than an arrangement interval w2 (=(w2a+w2b)/2) of each of the linear protrusions within the sub-pixel B.