Tempered Glass Anti-Reflection Layer for LCD Static Discharge

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Solution Overview

Problem

LCD devices, particularly IPS mode, face issues with static electricity on the glass substrate, which distorts electric fields and affects liquid crystal molecule alignment, leading to decreased view angles and reliability, and external light reflection causing damage.

Innovation Solution

Incorporating a tempered glass plate with an anti-reflection film that includes a non-conductive oxide film and a conductive oxide film, connected via a conductive tape to discharge static electricity, improving durability and preventing light reflection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional glass substrate is used in IPS mode LCD devices, then the device structure is simple, but static electricity accumulates on the glass surface causing electric field distortion and liquid crystal misalignment

Engineering Contradiction:

Improveprevention of static electricityVSAvoidstructure of glass substrate

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The glass substrate is replaced with a composite structure consisting of a plastic substrate coated with a hard coating layer. This composite material provides both the mechanical properties needed for durability and the ability to control surface electrical properties, thereby preventing static electricity accumulation while maintaining structural integrity

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The surface properties of the glass substrate are modified by applying a hard coating layer with specific electrical characteristics. This changes the surface parameters to prevent static electricity generation, transforming the substrate from a static-prone surface to one that dissipates electrical charges

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If the glass substrate surface is left untreated, then manufacturing is simple, but light reflection occurs reducing display quality

Engineering Contradiction:

Improvedisplay qualityVSAvoidmanufacturing process

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

A multi-layer composite structure is applied to the substrate including a hard coating layer and an anti-reflection coating layer. This composite approach simultaneously addresses light reflection issues while maintaining manufacturing feasibility through established coating technologies

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

An anti-reflection coating layer is introduced as an intermediary between the substrate and the external environment. This intermediate layer reduces light reflection by creating optical impedance matching, thereby improving display quality without fundamentally changing the substrate manufacturing process

Inventive Principle:

Principle #24Intermediary (Mediator)

3Strength

If a standard glass plate is used, then the device is lightweight, but it is susceptible to damage from external impacts

Engineering Contradiction:

Improvedurability against impactVSAvoidweight of substrate

Core Design Contradiction:

StrengthVSWeight of moving object

Solution Approach 1:

The traditional glass substrate is replaced with a composite structure of plastic substrate plus hard coating layer. This composite provides impact resistance comparable to or exceeding traditional glass while reducing overall weight, as the plastic base material is lighter and the hard coating is applied as a thin protective layer

Inventive Principle:

Principle #40Composite materials

4Reliability

If no anti-reflection treatment is applied, then manufacturing is easier, but light reflection lowers LCD device quality

Engineering Contradiction:

ImproveLCD device qualityVSAvoidcoating structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The anti-reflection treatment is integrated as a thin coating layer within the composite substrate structure. This approach provides effective light reflection reduction while keeping the overall device structure relatively simple and maintaining manufacturing feasibility through established coating processes

Inventive Principle:

Principle #40Composite materials

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

The solution effectively prevents static electricity and enhances the reliability and durability of LCD devices by ensuring stable electric fields and reducing damage from external impacts and light reflection.

Implementation Method 1

the anti-reflection layer having a non-conductive oxide film and a conductive oxide film

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

the anti-reflection layer having a non-conductive oxide film and a conductive oxide film

Methodology Applied

Scientific EffectOptical interference: Interference

Data Source

PatentUS8259261B2Liquid crystal display device comprising a tempered glass plate with an anti-reflection layer preventing static electricity

Publication Date: 2012.09.04 LG DISPLAY CO LTD

AI summary

A liquid crystal display device is provided. The liquid crystal display device according to an exemplary embodiment includes a backlight unit; a liquid crystal display panel located on the backlight unit; a polarization plate located on the liquid crystal display panel; and a tempered glass plate located on the polarization plate, the tempered glass plate including an anti-reflection layer having at least one of a non-conductive oxide film and a conductive oxide film, wherein a conductive tape is connected to a portion of the anti-reflection layer.