Patterned Electrode LCD for Viewing Angle and Transmittance

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Solution Overview

Problem

Conventional Multi-Domain Vertical Alignment (MVA) LCDs suffer from poor transmittance and inability of liquid crystal molecules to recover after being pressed, limiting their performance in achieving wide viewing angles and high contrast ratios.

Innovation Solution

The LCD design incorporates a patterned electrode layer with complete coverage regions and slit distribution regions, along with domain formation means on the substrates, to stabilize the slanting directions of liquid crystal molecules, enhancing transmittance and allowing easy recovery after pressure is applied.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If silts or protrusions are formed on electrodes to achieve wide viewing angles in conventional MVA LCDs, then the viewing angle is improved, but transmittance deteriorates and LC molecules cannot recover after pressing

Engineering Contradiction:

Improveviewing angleVSAvoidtransmittance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The electrode is segmented into multiple complete coverage regions separated by slit distribution regions. This segmentation allows different areas of the electrode to serve different functions: complete coverage regions maintain transmittance while slit distribution regions stabilize LC molecule orientation, resolving the contradiction between viewing angle and transmittance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the electrode are given different properties: complete coverage regions have high transmittance for optimal display quality, while slit distribution regions have structural features that stabilize LC molecule slanting directions. This local differentiation allows simultaneous optimization of both transmittance and viewing angle.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If silts or protrusions are formed on electrodes to achieve wide viewing angles, then the viewing angle is improved, but LC molecule recovery after pressing deteriorates

Engineering Contradiction:

Improveviewing angleVSAvoidLC molecule recovery

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The slit distribution region acts as an intermediary structure between the electrode and LC molecules. It provides a stable framework that guides LC molecule orientation without physically blocking their movement, enabling both wide viewing angles and successful recovery after pressing.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The electrode structure is designed to be dynamic in function: complete coverage regions maintain LC molecule orientation for viewing angle, while slit distribution regions allow LC molecules to move and recover after pressing. This dynamic functionality resolves the contradiction between stability for viewing angle and mobility for recovery.

Inventive Principle:

Principle #15Dynamics

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 design achieves high transmittance and transmittance contrast, stabilizes liquid crystal molecule directions, and allows for wide viewing angles, improving the overall display performance by effectively controlling the orientation of liquid crystals.

Implementation Method 1

The liquid crystal layer is disposed between the first substrate and the second substrate. A plurality of LC molecules of the LC layer have various slanting directions, and each of the complete coverage regions is located at a slanting center of the slanting directions of the LC molecules.

Methodology Applied

Scientific EffectLiquid crystal orientation: Liquid Crystals

Implementation Method 2

The patterned electrode layer has a plurality of complete coverage regions and at least one slit distribution region. The slit distribution region is used for stabilizing the slanting directions of the LC molecules.

Methodology Applied

Scientific EffectGeometric confinement effect:

Implementation Method 3

The first substrate of the LCD has a domain formation means. The domain formation means comprises a plurality of first domain formation means. A shape of each of the first domain formation means is point symmetric, and each of the first domain formation means is disposed in the corresponding pixel region.

Methodology Applied

Scientific EffectDomain formation:

Data Source

PatentUS8269935B2Liquid crystal display

Publication Date: 2012.09.18 RED OAK INNOVATIONS LTD

AI summary

A liquid crystal display is provided. The liquid crystal display having a plurality of pixel regions includes a first substrate, a second substrate and a liquid crystal layer. The second substrate has a patterned electrode layer having a plurality of complete coverage regions and at least one slit distribution region. Each of the complete coverage regions is located in a corresponding pixel region. The liquid crystal layer is disposed between the first substrate and the second substrate. Liquid crystal molecules of the liquid crystal layer have various slanting directions, and each of the complete coverage regions is located at a slanting center of the slanting directions of the liquid crystal molecules. The slit distribution region is used for stabilizing the slanting directions of liquid crystal molecules within the liquid crystal layer.