Liquid Crystal Display Seal Material Air Intake Opening

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Solution Overview

Problem

Liquid crystal display devices face display unevenness due to non-uniform cell gaps, primarily caused by excessive crushing of seal materials, particularly in the peripheral areas of large-sized mother substrates, leading to suboptimal gray display and reduced display quality.

Innovation Solution

A method of manufacturing liquid crystal display devices involving the formation of seal and peripheral seal materials in specific closed loop shapes with air intake openings, allowing controlled pressure application in a vacuum chamber to maintain a uniform cell gap, preventing excessive crushing and ensuring consistent display quality across the panel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If pressure is applied to attach substrates, then substrate attachment is achieved, but seal materials are excessively crushed causing non-uniform cell gaps

Engineering Contradiction:

Improvesubstrate attachmentVSAvoidcell gap uniformity

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

Air intake openings are formed in the peripheral seal material before substrate attachment, enabling controlled pressure equalization during the attachment process to prevent excessive crushing of seal materials

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The peripheral seal material is designed with air intake openings creating a porous structure that allows air passage, enabling pressure control to maintain uniform cell gaps while achieving substrate attachment

Inventive Principle:

Principle #31Porous materials

2Reliability

If seal materials are formed in closed loop shapes, then liquid crystal containment is achieved, but excessive crushing occurs in peripheral areas

Engineering Contradiction:

Improveliquid crystal containmentVSAvoidcell gap uniformity in peripheral areas

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The peripheral seal material is differentiated from the seal material by incorporating air intake openings only in the peripheral seal material, creating local structural variation that prevents excessive crushing in peripheral areas while maintaining liquid crystal containment

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The seal structure is segmented into two distinct parts: seal material forming closed loops for liquid crystal containment, and peripheral seal material with air intake openings for pressure control, allowing each part to perform its specific function

Inventive Principle:

Principle #1Segmentation

3Productivity

If vacuum chamber pressure difference is used for attachment, then attachment efficiency is improved, but control of pressure distribution becomes difficult

Engineering Contradiction:

Improveattachment efficiencyVSAvoidpressure distribution control

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

Air intake openings serve as intermediaries that allow controlled air passage from the vacuum chamber into the seal material interior, enabling gradual pressure equalization and easier control of pressure distribution during attachment

Inventive Principle:

Principle #24Intermediary (Mediator)

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 approach ensures uniform cell gaps are maintained, preventing display unevenness and enhancing the manufacturing yield of high-quality liquid crystal display devices by controlling the pressure difference between the seal materials and the atmospheric pressure, thus improving the overall display quality.

Implementation Method 1

applying a pressure to the first and second substrates by pressure difference between the atmospheric pressure of circumference which surrounds the first substrate and second substrate and the atmospheric pressure of a space between the first and second seal materials

Methodology Applied

Scientific EffectPressure difference: Pressure Gradient

Implementation Method 2

arranging a second substrate on a surface of the first substrate in which the first and second seal materials and the peripheral seal material are formed in a vacuum chamber under vacuum state

Methodology Applied

Scientific EffectVacuum: Vacuum

Data Source

PatentUS8524096B2Method of manufacturing liquid crystal display device

Publication Date: 2013.09.03 MAGNOLIA WHITE CORP

AI summary

In one embodiment, a first substrate including first and second array regions are prepared. The first and second array regions respectively include first and second active areas. A peripheral seal material having an air intake opening is arranged outside the first and second array regions. A second substrate is arranged on the surface of the first substrate in which the first and second seal materials and peripheral seal material are formed in a vacuum chamber under vacuum state. Atmosphere is introduced into the vacuum chamber and a space between the first and second seal materials from the air intake opening. Then, a pressure is applied to the first and second substrates by pressure difference between the atmospheric pressure of circumference which surrounds the first substrate and second substrate, and the atmospheric pressure of the space between the first substrate and second substrate.