Liquid Crystal Display Seal Area Protruding Connection

Solution Overview

Problem

In liquid crystal display devices, achieving a secure electrical connection between the common electrode drive circuit and the detection electrodes is challenging due to insufficient pressure between the substrates during the one drop filling process, leading to potential unevenness in the cell gap and poor connection quality.

Innovation Solution

The first substrate includes a conductive connection projecting toward the second substrate within the seal area, allowing the conductive material in the sealant to fit between the connection and the electrode, ensuring a secure electrical connection is established when the substrates are pressed together, without increasing the size of the conductive material, thus maintaining even cell gaps.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the substrates are pressed together during the one drop filling process, then the electrical connection between the drive circuit and detection electrodes is improved, but the cell gap becomes uneven

Engineering Contradiction:

Improveelectrical connectionVSAvoidcell gap uniformity

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The seal area is divided into a first area where connections protrude toward the second substrate and a second area where the alignment film is formed. This segmentation allows different functional requirements to be met in different regions: electrical connection in the first area and cell gap uniformity in the second area.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The alignment film is selectively formed only in the second area of the seal area, not in the first area. This local quality approach ensures that the alignment film maintains cell gap uniformity in regions where it is needed, while allowing connections to protrude in the first area without being covered by the alignment film.

Inventive Principle:

Principle #3Local quality

2Reliability

If the conductive material size is increased to ensure electrical connection, then the connection reliability is improved, but the device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improveelectrical connectionVSAvoidconductive material configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Protruding connections act as intermediaries between the drive circuit and the detection electrodes. These connections extend into the seal area to facilitate electrical connection through the sealant, eliminating the need for excessive conductive material while ensuring reliable electrical connection.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Manufacturing precision

If the alignment film is formed covering the entire seal area, then the cell gap uniformity is improved, but the electrical connection between drive circuit and detection electrodes deteriorates

Engineering Contradiction:

Improvecell gap uniformityVSAvoidelectrical connection

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The seal area is divided into a first area where connections protrude toward the second substrate and a second area where the alignment film is formed. This segmentation allows different functional requirements to be met in different regions: electrical connection in the first area and cell gap uniformity in the second area.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The alignment film is selectively formed only in the second area of the seal area, not in the first area. This local quality approach ensures that the alignment film maintains cell gap uniformity in regions where it is needed, while allowing connections to protrude in the first area without being covered by the alignment film.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS10101614B2Liquid crystal display device

Publication Date: 2018.10.16 MAGNOLIA WHITE CORP

AI summary

According to one embodiment, a liquid crystal display device includes a first substrate, a second substrate, a sealant which adheres the first substrate and the second substrate, a liquid crystal layer sealed between the first substrate and the second substrate, and an alignment film. The liquid crystal display device includes a drive circuit in one of the first substrate and the second substrate, a first electrode in the other of the first substrate and the second substrate, a first conductive material inside the sealant, and a first connection which is on a seal area to project toward the second substrate and is conductive, wherein the first electrode is electrically connected to the drive circuit through the first connection and the first conductive material.