Liquid Crystal Display Pixel Electrode Fringing Field Control

Solution Overview

Problem

Conventional liquid crystal display devices, such as FFS mode, face limitations in response speed and alignment stability due to uniform rotation of liquid crystal molecules, which affects display performance.

Innovation Solution

The liquid crystal display device employs a high-speed response mode with a unique electrode configuration, including sub-pixel areas with distinct rotation directions for liquid crystal molecules near the edges and center, utilizing a pixel electrode and common electrode arrangement to generate a fringing electric field, enhancing response speed and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If uniform rotation of liquid crystal molecules is used in FFS mode, then alignment is simplified, but response speed and alignment stability deteriorate

Engineering Contradiction:

Improvealignment controlVSAvoidresponse speed

Core Design Contradiction:

Device complexityVSSpeed

Solution Approach 1:

The pixel electrode is divided into multiple regions (first region and second region) with different electrode potentials, creating distinct electric field zones that induce different rotation directions in liquid crystal molecules of each region, thereby achieving segmented control of molecular alignment

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the pixel electrode are assigned different potentials to create localized electric field characteristics, causing liquid crystal molecules in different areas to rotate in different directions, which optimizes response speed and alignment stability in each specific region

Inventive Principle:

Principle #3Local quality

2Device complexity

If uniform rotation of liquid crystal molecules is used in FFS mode, then alignment control is simplified, but alignment stability deteriorates

Engineering Contradiction:

Improvealignment controlVSAvoidalignment stability

Core Design Contradiction:

Device complexityVSStability of the object's composition

Solution Approach 1:

The pixel electrode is divided into multiple regions (first region and second region) with different electrode potentials, creating distinct electric field zones that induce different rotation directions in liquid crystal molecules of each region, thereby achieving segmented control of molecular alignment

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the pixel electrode are assigned different potentials to create localized electric field characteristics, causing liquid crystal molecules in different areas to rotate in different directions, which optimizes response speed and alignment stability in each specific region

Inventive Principle:

Principle #3Local quality

3Speed

If high-speed response mode with different rotation directions is used, then response speed and alignment stability improve, but device complexity increases

Engineering Contradiction:

Improveresponse speedVSAvoidelectrode configuration

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The pixel electrode serves multiple functions: it acts as both a common electrode and a segmented control electrode, generating both uniform and non-uniform electric fields depending on the potential distribution, thereby achieving multiple alignment modes without adding separate electrode structures

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The first and second regions of the pixel electrode are merged into a single electrode structure that can be independently controlled through different potential applications, combining the functions of multiple electrodes into one integrated component

Inventive Principle:

Principle #5Merging (Combining)

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 increases response speed and improves alignment stability by allowing antagonistic rotational directions of liquid crystal molecules, optimizing display performance with adjustable response speed and luminance across different areas.

Implementation Method 1

a fringe field switching (FFS) mode liquid crystal display device comprising a pixel electrode and a common electrode disposed in different layers to control the alignment of the liquid crystal molecules by using a fringing field generated between these electrodes

Methodology Applied

Scientific EffectFringing field: Electric Field

Implementation Method 2

controls the alignment of the liquid crystal molecules in the liquid crystal layer by using a lateral electric field generated between these electrodes

Methodology Applied

Scientific EffectDielectric anisotropy: Dielectric

Data Source

PatentUS10007162B2Liquid crystal display device

Publication Date: 2018.06.26 MAGNOLIA WHITE CORP

AI summary

A liquid crystal display device comprises a first substrate and a liquid crystal layer. The substrate includes a pixel electrode and sub-pixel areas including a first area and a second area. The first area is an area where the pixel electrode exists, the second area is an area where the pixel electrode does not exist. The first area includes first and second main areas. The second area includes a first gap area extending in a second direction, between the first and second main areas. The first gap area includes first and second end parts in the second direction, and a central part between the first and second end parts. A width of the first gap area in the first direction is greater at the central part than at any one of the first end part and the second end part.