Liquid Crystal Display Electrode Convex Concave Branch Structure
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Solution Overview
Problem
Liquid crystal display apparatuses with vertical alignment modes face challenges in achieving uniform and high light transmittance due to alignment issues of liquid crystal molecules, particularly with the fine slit structure, which results in dark lines and reduced response characteristics to voltage.
Innovation Solution
A liquid crystal display panel with a specific electrode configuration featuring convex and concave branch electrode portions that apply a pre-tilt to liquid crystal molecules, allowing for faster stabilization of alignment and reduced manufacturing time, thereby enhancing light transmittance and response characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fine slit structure is used in the electrode, then the alignment control of liquid crystal molecules is improved, but dark lines occur and light transmittance is reduced
Solution Approach 1:
The electrode is divided into multiple convex portions and concave portions arranged in a segmented pattern. The convex portions generate electric fields that control liquid crystal molecule alignment, while the concave portions create dark lines that prevent unwanted alignment. This segmentation allows precise control of liquid crystal orientation while maintaining light transmittance through the strategic arrangement of conductive and non-conductive regions.
Solution Approach 2:
Different regions of the electrode are given different properties: convex portions are conductive and generate electric fields for alignment control, while concave portions are non-conductive and create dark lines. This local differentiation of electrical properties allows the same electrode structure to simultaneously achieve precise alignment control and maintain light transmittance by preventing unwanted molecular alignment in specific areas.
2Reliability
If voltage is applied to regulate liquid crystal molecule alignment, then the response characteristic is improved, but the alignment state is disturbed and manufacturing time increases
Solution Approach 1:
The convex and concave portions are formed in advance during electrode fabrication, creating a pre-structured electric field distribution. This preliminary structural preparation eliminates the need for time-consuming post-manufacturing voltage application to regulate alignment, as the electrode geometry itself inherently controls liquid crystal molecule orientation during assembly.
Solution Approach 2:
The patent replaces the temporal process of applying voltage during manufacturing with a spatial solution through electrode geometry. Instead of using time-based voltage application to control alignment, the convex and concave portions create spatial electric field distributions that passively regulate molecule orientation, thereby eliminating the time loss associated with voltage application during assembly.
3Manufacturing precision
If a stem convex portion with branch convex portions is used, then alignment regulation is improved, but dark lines are easily generated in the stem convex portion
Solution Approach 1:
The electrode structure employs asymmetric arrangement of convex and concave portions, where the stem convex portion has a specific geometry that generates controlled electric fields for alignment regulation. The asymmetric design allows the stem region to maintain proper alignment control while the branch convex portions create corresponding dark lines in complementary regions, balancing the overall light transmittance and alignment performance.
Solution Approach 2:
Instead of making the stem convex portion entirely conductive to maximize alignment control, the patent inverts the approach by creating a pattern of convex and concave portions. The concave portions in the stem region act as non-conductive elements that prevent excessive electric field concentration, thereby reducing dark line formation while maintaining sufficient alignment regulation through the remaining convex portions.
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 configuration effectively regulates the alignment of liquid crystal molecules, reducing dark lines and improving light transmittance while maintaining excellent voltage response characteristics, leading to lower power consumption and cost reduction in backlighting and improved TFT reliability.
Implementation Method 1
In the VA mode, the liquid crystal molecules have a negative dielectric anisotropy, that is, a characteristic that a dielectric constant in a long axis direction of the liquid crystal molecules is smaller than that in a short axis direction thereof
Implementation Method 2
if voltage is applied, the liquid crystal molecules that are aligned in the vertical direction with respect to a substrate react to fall down in a direction that is parallel to the substrate due to the negative dielectric anisotropy
Data Source
AI summary
According to some aspects, a liquid crystal display panel comprising an electrode is provided. The electrode comprises a plurality of convex branch electrode portions arranged in a plane, the convex branch electrode portions being convex when viewed from a first direction perpendicular to the plane and extending from a central region of the electrode to a periphery of the electrode, and a plurality of concave branch electrode portions, the concave branch electrode portions being concave when viewed from the first direction, extending from the central region to the periphery and adjacent to convex branch electrode portions. According to some aspects, a method of applying a pretilt to molecules in a liquid crystal layer of a liquid crystal display panel by applying a voltage to the liquid crystal layer via first and second electrodes is provided.