Liquid Crystal Display Pixel Electrode Micro Branches
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Solution Overview
Problem
Liquid crystal display devices, particularly in VA and SVA modes, suffer from reduced contrast ratio and visibility issues at side viewing angles, along with the occurrence of rainbow stains when exposed to external light, which degrades image quality.
Innovation Solution
A liquid crystal display panel design featuring a pixel electrode structure with subpixels having micro branches and slits arranged at specific angles relative to the polarization axis, and varying widths, which inhibits rainbow stains and improves front and side visibilities by optimizing the arrangement of liquid crystal molecules and light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If slits are formed in electric field generating electrodes to achieve wider viewing angle, then viewing angle is improved, but aperture ratio is reduced
Solution Approach 1:
The pixel electrode is divided into multiple micro branches instead of using a continuous electrode structure. This segmentation allows the electrode to function effectively while maintaining a higher aperture ratio, as the micro branches occupy less total area than traditional slit structures while still achieving the desired viewing angle improvement through optimized light transmission characteristics.
Solution Approach 2:
The micro branches are strategically positioned and dimensioned to create specific local optical properties. By controlling the width, spacing, and orientation of individual micro branches, the design optimizes light transmission in specific directions to improve viewing angle while minimizing the overall electrode area to maintain high aperture ratio.
2Stability of the object's composition
If micro slits are formed to adjust alignment and directionality of liquid crystal molecules, then alignment control is improved, but contrast ratio is reduced at side viewing angles
Solution Approach 1:
The design optimizes parameters such as micro branch width, spacing, and orientation angles to achieve the desired liquid crystal alignment while maintaining contrast ratio. By carefully selecting these parameters, the micro branch structure provides sufficient alignment control without creating the light leakage issues that reduce contrast at side viewing angles.
Solution Approach 2:
The micro branches are designed with asymmetric dimensions and orientations that are optimized for specific viewing directions. This asymmetric design allows the structure to provide strong alignment control for vertical alignment mode while minimizing the impact on contrast ratio at side viewing angles through directional light transmission optimization.
3Ease of manufacture
If traditional pixel electrode structure is used, then manufacturing is simple, but rainbow stains occur when fluorescent light is incident
Solution Approach 1:
The pixel electrode is segmented into multiple micro branches, which disrupts the continuous structure that causes rainbow stains. This segmentation prevents the formation of large-scale interference patterns when fluorescent light passes through, thereby eliminating the rainbow stain effect while maintaining manufacturing feasibility through standard photolithography processes.
Solution Approach 2:
The design converts the potential harm of having any electrode structure (which can cause rainbow stains) into a benefit by using a micro branch configuration that inherently prevents rainbow stain formation. The segmented structure that might seem to complicate manufacturing actually simplifies the optical performance by eliminating the need for additional anti-rainbow stain measures.
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
Enhances image quality by maintaining consistent visibility across viewing angles and reducing rainbow stains, thereby improving the overall display performance of liquid crystal display devices.
Implementation Method 1
alignment and directionality of liquid crystal molecules are adjusted by micro slits formed only in either one of electric field generating electrodes facing each other
Implementation Method 2
a first subpixel electrode, wherein the first subpixel electrode includes a plurality of first micro branches, which are arranged at a first angle with respect to a polarization axis of a polarizer
Implementation Method 3
If voltages are supplied to the electric field generating electrodes, an electric field is formed in the liquid crystal layer. This electric field changes an arrangement of liquid crystal molecules in the liquid crystal layer.
Implementation Method 4
Incident lights, which have passed through the liquid crystal layer with the liquid crystal molecules having different arrangements, have various phase differences.
Data Source
AI summary
A liquid crystal display panel, including: a first substrate including a common electrode; a second substrate including a plurality of pixels which are arranged in a matrix form and face the common electrode, wherein at least one of the pixels includes first and second subpixels; the first subpixel including a first subpixel electrode, wherein the first subpixel electrode includes a plurality of first micro branches, which are arranged at a first angle with respect to a polarization axis of a polarizer disposed adjacent to the first or second substrate; the second subpixel including a second subpixel electrode, wherein the second subpixel electrode includes a plurality of second micro branches, which are arranged at a second angle with respect to the polarization axis of the polarizer, wherein the first angle is different from the second angle by about 20° or less; and a liquid crystal layer interposed between the first and second substrates.