Transflective LCD Polymer Network Confinement for Liquid Crystal Bruising

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Solution Overview

Problem

Conventional transflective liquid crystal display devices experience issues with bruising and pooling of liquid crystal molecules due to pressure and stress, leading to undesirable orientation and slow restoration of liquid crystal molecules.

Innovation Solution

A liquid crystal display device with a first liquid crystal layer in the reflective region and a second liquid crystal layer in the transmissive region, where the first liquid crystal layer includes a polymer network or droplet to control movement and confinement of the second liquid crystal layer, using an isolation wall to prevent pooling and bruising, and ensuring enhanced reflectivity without additional processes like embossing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If pressure is applied to the liquid crystal device when a user touches a substrate, then the liquid crystal display device can be operated, but liquid crystal molecules are undesirably orientated causing strains or spots

Engineering Contradiction:

Improvetouch operationVSAvoidliquid crystal molecule orientation

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The liquid crystal layer is divided into multiple domains with different orientation directions. When pressure is applied, only certain domains are affected while others maintain their original orientation, preventing overall distortion and spots in the display.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the liquid crystal layer are given different initial orientation characteristics. This local differentiation allows the display to withstand pressure in specific areas without causing uniform distortion across the entire display region.

Inventive Principle:

Principle #3Local quality

2Ease of operation

If pressure is applied to the liquid crystal device, then the liquid crystal display device can be operated, but liquid crystal molecules do not rapidly restore to initial orientation state causing bruising

Engineering Contradiction:

Improvetouch operationVSAvoidrestoration speed of liquid crystal molecules

Core Design Contradiction:

Ease of operationVSSpeed

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The liquid crystal molecules are designed to periodically switch between different orientation states. This periodic reorientation capability allows rapid restoration after pressure is released, preventing bruising effects.

Inventive Principle:

Principle #19Periodic action

3Ease of operation

If pressure is applied to the liquid crystal device, then the liquid crystal display device can be operated, but adjacent portions of the liquid crystal layer are continuously slopped causing pooling

Engineering Contradiction:

Improvetouch operationVSAvoidliquid crystal layer distribution

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The orientation parameters of liquid crystal molecules are changed in different regions to create stable configurations that resist pressure-induced slopping and pooling effects.

Inventive Principle:

Principle #35Parameter changes

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

Effectively reduces or prevents bruising and pooling phenomena, enhances reflectivity, and simplifies the manufacturing process by eliminating the need for complex embossing steps, while ensuring rapid restoration of liquid crystal molecules to their initial orientation.

Implementation Method 1

The first liquid crystal layer may include a polymer network and first liquid crystal molecules partially and/or totally dispersed in the polymer network

Methodology Applied

Scientific EffectPolymer network confinement:

Implementation Method 2

The liquid crystal display device displays an image by controlling transmittance of light according to orientation of liquid crystal molecules in the liquid crystal layer by varying an electric field generated between the substrates

Methodology Applied

Scientific EffectElectric field orientation: Electric Field

Implementation Method 3

The liquid crystal display device displays an image by controlling transmittance of light according to orientation of liquid crystal molecules

Methodology Applied

Scientific EffectLiquid crystal optical modulation: Liquid Crystals

Data Source

PatentUS8610851B2Liquid crystal display devices and methods of manufacturing liquid crystal display devices

Publication Date: 2013.12.17 SAMSUNG DISPLAY CO LTD

AI summary

A liquid crystal display device includes a first substrate having a reflective region and a transmissive region, a second substrate corresponding to the first substrate, and a liquid crystal structure located between the first substrate and the second substrate, the liquid crystal structure including a first liquid crystal layer located in the reflective region and a second liquid crystal layer located in the transmissive region, wherein the first liquid crystal layer is configured to control movement of the second liquid crystal layer.