MVA Liquid Crystal Display Protrusion Alignment
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Solution Overview
Problem
Liquid crystal display devices in multi-domain vertical alignment mode face challenges in reducing response time while maintaining optical characteristics such as transmittance and contrast ratio, especially in high-definition displays for mobile terminals where motion video performance is inadequate due to protrusions causing light leaks and voltage drops.
Innovation Solution
The implementation of a liquid crystal display device configuration with a first and second alignment film, light-blocking wiring lines, and insulative protrusions or slit portions that control liquid crystal molecule alignment to form multi-domains, where the second protrusion or slit is narrower and perpendicular to the first, effectively reducing response time without compromising optical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If protrusions are provided on the counter-electrode to form multi-domain, then alignment stability is improved, but local light leak and voltage drop occur causing image quality degradation
Solution Approach 1:
The invention transitions from two-dimensional protrusions on the counter-electrode surface to three-dimensional inclined surfaces extending from the pixel electrode into the liquid crystal layer. This dimensional change allows the alignment control structure to occupy space within the liquid crystal layer rather than merely on the electrode surface, reducing interference with light transmission paths and voltage distribution.
Solution Approach 2:
The invention extracts the alignment control function from the counter-electrode and relocates it to the pixel electrode side. By forming inclined surfaces on the pixel electrode that extend into the liquid crystal layer, the alignment control is separated from the counter-electrode protrusions that cause light leak and voltage drop problems.
2Illumination intensity
If the size of protrusions and interval of pixel electrodes are reduced to improve transmittance, then optical characteristics are improved, but alignment stability deteriorates
Solution Approach 1:
The invention uses inclined surfaces that extend vertically into the liquid crystal layer from the pixel electrode, creating a three-dimensional alignment control structure. This allows effective alignment control with smaller horizontal dimensions, thereby maintaining larger pixel electrode areas and improving transmittance while still achieving stable multi-domain alignment.
Solution Approach 2:
The inclined surfaces are formed with specific inclination angles (45° or 60°) to optimize the balance between alignment control effectiveness and light transmission. The local geometry of the inclined surfaces is optimized to provide sufficient alignment stability while minimizing interference with optical characteristics.
3Stability of the object's composition
If protrusions are made larger to improve alignment stability, then alignment stability is improved, but response time increases due to reduced inclined electric field region
Solution Approach 1:
The inclined surfaces extend vertically into the liquid crystal layer, creating a three-dimensional structure that generates inclined electric fields throughout the liquid crystal thickness. This increases the volume of the inclined electric field region without requiring larger horizontal dimensions, thereby reducing response time while maintaining alignment stability.
Solution Approach 2:
The inclined surfaces are designed with asymmetric geometry (inclined at 45° or 60° angles) to create effective inclined electric fields that improve response time. The asymmetric shape allows the structure to occupy minimal space while generating sufficient electric field inclination for fast response.
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 decreases response time by ½ to ⅓ of the original, maintaining tolerable optical characteristics, enabling high-definition displays with improved motion video quality by increasing the region with an inclined electric field, thus enhancing display smoothness and reducing unnatural trailing effects.
Implementation Method 1
a first alignment film which is disposed in a manner to cover the pixel electrodes and aligns the liquid crystal molecules in a direction substantially perpendicular to the first substrate
Implementation Method 2
an insulative protrusion which controls an alignment direction of the liquid crystal molecules in a manner to form a multi-domain in each of the pixels
Implementation Method 3
a liquid crystal layer including liquid crystal molecules having negative dielectric constant anisotropy
Data Source
AI summary
An MVA mode liquid crystal display device has a liquid crystal layer including liquid crystal molecules having negative dielectric constant anisotropy held between a first substrate and a second substrate. It includes a structural body which controls an alignment direction of the liquid crystal molecules to form a multi-domain in each of pixels. The structural body includes a first structural body which overlaps a light-blocking wiring line, and a second structural body which is disposed in a direction substantially perpendicular to the first structural body and is narrower than the first structural body.