Short Ring Circuit Static Discharge LCD Seal

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Solution Overview

Problem

The manufacturing of liquid crystal display devices is hindered by static electricity, which can damage conductive and resin layers, and the narrow seal material width reduces the effectiveness of impurity blocking, potentially leading to contamination and conductivity issues in the liquid crystal layer.

Innovation Solution

A short ring circuit is integrated in the liquid crystal display device, comprising electrodes and insulating layers that manage static electricity by creating cutout or convex portions to direct electrical discharge away from sensitive areas, preventing damage and corrosion while maintaining the seal's impurity-blocking capability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of stationary object

If the width of the seal material is reduced to narrow the frame and improve outside dimension, then the device size is reduced, but the impurity-blocking function is weakened leading to contamination risk

Engineering Contradiction:

Improveframe widthVSAvoidimpurity-blocking function

Core Design Contradiction:

Length of stationary objectVSReliability

Solution Approach 1:

The seal material is divided into multiple segments: a first seal material and a second seal material arranged in different directions. This segmentation allows each segment to specialize in blocking impurities from different directions, maintaining effective impurity blocking even when the overall seal width is reduced.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The impurity-blocking function is extracted from the seal material and assigned to specific protruding portions that extend into the liquid crystal layer. These protruding portions act as dedicated impurity barriers, separating the sealing function from the framing function.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If static electricity is applied during manufacturing to test conductivity, then electrical properties are verified, but damage occurs to conductors and resin layers

Engineering Contradiction:

Improveelectrical property verificationVSAvoidstatic electricity damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A ground electrode is introduced as an intermediary element to safely discharge static electricity. The ground electrode receives static electricity from the liquid crystal layer through a discharge electrode and releases it to ground, preventing damage to the liquid crystal layer and surrounding structures.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The ground electrode and discharge electrode structure is prepared in advance during manufacturing, enabling safe static electricity discharge before the device is sealed. This preliminary setup allows conductivity testing and static electricity management without risking damage to the liquid crystal layer.

Inventive Principle:

Principle #10Preliminary action

3Speed

If the liquid crystal layer is made thin to improve response speed and viewing angle, then performance is enhanced, but susceptibility to impurity damage increases

Engineering Contradiction:

Improveresponse speedVSAvoidsusceptibility to impurity damage

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

Protruding portions of the seal material are extended into the liquid crystal layer in advance to create protective barriers against impurities. This beforehand cushioning protects the thin liquid crystal layer from potential impurity contamination that could cause short circuits or corrosion.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The seal material is designed with protruding portions that extend into the liquid crystal layer, converting the potential harm of impurity contact into a benefit by creating a protective barrier. The protruding portions act as sacrificial elements that prevent impurities from reaching the liquid crystal layer.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 solution effectively controls static electricity and prevents corrosion, ensuring the reliability and yield of liquid crystal display devices without additional manufacturing processes, while maintaining the seal's impurity-blocking function.

Implementation Method 1

function to block impurities entering into the liquid crystal layer from outside by the seal material

Methodology Applied

Scientific EffectPhysical containment: Physical Containment

Implementation Method 2

manage static electricity by creating cutout or convex portions to direct electrical discharge away from sensitive areas

Methodology Applied

Scientific EffectElectrical discharge: Electrostatic Discharge

Data Source

PatentUS9229282B2Liquid crystal display device

Publication Date: 2016.01.05 MAGNOLIA WHITE CORP

AI summary

In one embodiment, a first wiring line is pulled out from an active area, and a short ring circuit is provided in a peripheral portion of the active area. A first electrode is formed in the same layer as the first wiring line. A semiconductor layer is formed on the first electrode. A portion of a second electrode faces the first electrode through an insulating layer and arranged on the semiconductor layer. A third electrode is arranged on the semiconductor layer in the same layer as the second electrode. The first electrode includes a cutout portion arranged under an edge of the second electrode.