Liquid Crystal Display Electrode Concave Convex Structure
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Solution Overview
Problem
Liquid crystal display devices in the VA mode face challenges with uniform high transmittance and voltage responsive properties due to the disorganization of liquid crystal molecules during voltage application, particularly in fine slit structures where dark lines occur and transmittance is reduced.
Innovation Solution
The implementation of a liquid crystal display device with concave and convex portions on the electrodes, including stepped portions on the convex stem portions and branched convex portions that extend in a cross shape, along with an orientation regulating portion on the second electrode, enhances the electric field strength and defines the tilt state of liquid crystal molecules, thereby improving transmittance and responsive characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fine slit structure is used in the electrode to control liquid crystal molecule orientation, then the viewing angle is improved, but the transmittance is reduced due to the presence of non-electric field regions in slits and spaces
Solution Approach 1:
The electrode surface is divided into multiple convex portions and concave portions, creating a segmented structure that replaces the traditional fine slit design. This segmentation allows electric field application in the convex regions while eliminating the non-electric field problems associated with slits and spaces.
Solution Approach 2:
The invention transitions from a two-dimensional flat electrode surface to a three-dimensional structure with convex and concave portions. This dimensional change creates height differences that enable better electric field distribution and liquid crystal molecule orientation control without the drawbacks of planar slit structures.
2Adaptability or versatility
If liquid crystal molecules are oriented perpendicular to the substrate in VA mode, then the viewing angle is widened, but the orientation becomes disorganized during voltage application causing deterioration of responsive characteristic
Solution Approach 1:
Different regions of the electrode surface (convex portions vs. concave portions) provide different functions: convex portions apply electric field for voltage response, while concave portions and oriented films provide local orientation guidance. This local quality differentiation resolves the conflict between vertical alignment for viewing angle and organized response for reliability.
Solution Approach 2:
The oriented film is applied in advance to establish a predetermined orientation state of liquid crystal molecules before voltage application. This preliminary action ensures that when voltage is applied, the molecules transition in an organized manner from the pre-established orientation, maintaining responsive characteristics while achieving wide viewing angle.
3Stability of the object's composition
If concave and convex portions are formed on the electrode to improve orientation control, then the uniformity of transmittance is improved, but the manufacturing complexity increases
Solution Approach 1:
The convex and concave portions are integrated into a single electrode structure rather than being separate components. This merging approach achieves uniform transmittance improvement while minimizing the increase in manufacturing complexity by combining multiple functions into one element.
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 reliably suppresses dark line formation, achieves further uniform high transmittance, reduces backlight source costs and power consumption, and enhances the reliability of the TFT, while maintaining satisfactory voltage responsiveness.
Implementation Method 1
a pre-tilt is applied to the liquid crystal molecules by at least the first oriented film
Implementation Method 2
the liquid crystal molecules have negative dielectric constant anisotropy, namely, a characteristic that a dielectric constant of the liquid crystal molecules in a long axial direction is smaller than that in a short axial direction
Implementation Method 3
enhances the electric field strength and defines the tilt state of liquid crystal molecules
Data Source
AI summary
A liquid crystal display device is provided. The liquid crystal display device including a first substrate; a second substrate; a first electrode provided on a first surface of the first substrate, the first surface facing the second substrate, the first electrode including a plurality of convex and concave portions; a second electrode provided on a second surface of the second substrate; and a liquid crystal layer provided between the first substrate and the second substrate.