Polarizing Coating Layers for Narrow Bezel Displays

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Solution Overview

Problem

Liquid crystal display devices face challenges in minimizing dead space and preventing viewing angle light leakage, which affects the narrow bezel design and display quality.

Innovation Solution

The implementation of polarizing coating layers between substrates and polarizing plates, along with a light blocking layer, to control light leakage and minimize dead space by aligning polarizing coating layers with the display area and overlapping them with color filters and light blocking layers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If the non-display area is narrowed to implement narrow bezel design, then the display area ratio is improved, but viewing angle light leakage occurs and dead space increases

Engineering Contradiction:

Improvedisplay area ratioVSAvoidviewing angle light leakage

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

A polarizing coating layer is introduced as an intermediary component between the polarizing plate and the liquid crystal layer. This coating layer acts as a mediator to control and block leakage light in the viewing angle direction, preventing harmful light from reaching the display area while maintaining the narrow bezel design.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The solution addresses the two-dimensional display area expansion by extending control into the third dimension (depth/layering). By adding the polarizing coating layer at a specific position between substrates, the patent controls light leakage in the viewing angle direction without increasing the lateral bezel width, thus resolving the contradiction through dimensional addition.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Area of stationary object

If the non-display area is narrowed to implement narrow bezel design, then the display area ratio is improved, but dead space increases

Engineering Contradiction:

Improvedisplay area ratioVSAvoiddead space

Core Design Contradiction:

Area of stationary objectVSDevice complexity

Solution Approach 1:

The polarizing coating layer serves as an intermediary that fills and controls the dead space region. By positioning this functional layer in the non-display area, the patent converts previously wasted dead space into an active light control zone, thereby reducing the harmful effects of dead space while maintaining narrow bezel design.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If polarizing coating layers are added to control light leakage, then viewing angle light leakage is reduced, but device complexity increases

Engineering Contradiction:

Improveviewing angle light leakageVSAvoidstructure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The polarizing coating layer is designed to perform multiple functions simultaneously: it blocks leakage light in the viewing angle direction, maintains polarization functionality, and can be integrated with existing polarizing plate structures. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving light leakage control.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Object-affected harmful factors

If polarizing coating layers are positioned to overlap color filters and light blocking layers, then light leakage control is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improvelight leakage controlVSAvoidalignment precision

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The polarizing coating layer is applied with specific local characteristics - it is positioned to overlap only in the non-display area and extends into the display area only where needed for light control. This localized application reduces the overall alignment precision requirements compared to full-coverage layers, as critical alignment is needed only in specific regions rather than across the entire display surface.

Inventive Principle:

Principle #3Local quality

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 effectively reduces viewing angle light leakage and minimizes dead space, enabling the design of display devices with narrower bezels without compromising display quality.

Implementation Method 1

a first polarizing coating layer overlapping one end of the first polarizing plate... a second polarizing coating layer overlapping one end of the second polarizing plate... effectively reduces viewing angle light leakage

Methodology Applied

Scientific EffectPolarisation: Polarisation

Data Source

PatentUS11448919B2Display device

Publication Date: 2022.09.20 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a first substrate including a display area and a non-display area, a second substrate disposed on the first substrate, a liquid crystal layer disposed between one surface of the first substrate and one surface of the second substrate, a first polarizing plate disposed on the other surface of the first substrate and having one end disposed inside one end of the first substrate, a second polarizing plate disposed on the other surface of the second substrate and having one end disposed inside one end of the second substrate, a first polarizing coating layer overlapping the one end of the first polarizing plate, and a second polarizing coating layer overlapping the one end of the second polarizing plate.