Organic Passivation Film Water Absorption Layer for LCD Black Unevenness

Solution Overview

Problem

Conventional liquid crystal display devices face issues with black unevenness due to water ingress, which is often addressed using non-essential materials and processes that increase manufacturing costs and affect long-term display performance.

Innovation Solution

A liquid crystal display device with a water absorption layer formed from the same material and process as the organic passivation film, integrated within groove-shaped through-holes in the seal portion, not covered by an inorganic insulating film, to effectively absorb water and prevent it from reaching the liquid crystal layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an adsorbent layer made of non-essential material is arranged in the seal portion or between display area and seal portion, then water absorption capability is improved, but manufacturing cost increases and device complexity increases

Engineering Contradiction:

Improvewater absorption capabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The organic passivation film is designed to serve dual functions: its primary function of protecting the TFT substrate is enhanced by its secondary function of absorbing water through the groove-shaped through-holes. This eliminates the need for separate adsorbent layers made of non-essential materials, thereby reducing device complexity while maintaining water absorption capability

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention merges the protective function and water absorption function into a single integrated structure - the organic passivation film with groove-shaped through-holes. This consolidation eliminates the need for separate components, reducing both device complexity and manufacturing costs while achieving effective water absorption

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If an adsorbent layer made of non-essential material is arranged in the seal portion or between display area and seal portion, then water absorption capability is improved, but manufacturing cost increases

Engineering Contradiction:

Improvewater absorption capabilityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The organic passivation film is designed to serve dual functions: its primary function of protecting the TFT substrate is enhanced by its secondary function of absorbing water through the groove-shaped through-holes. This eliminates the need for separate adsorbent layers made of non-essential materials, thereby reducing device complexity while maintaining water absorption capability

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention merges the protective function and water absorption function into a single integrated structure - the organic passivation film with groove-shaped through-holes. This consolidation eliminates the need for separate components, reducing both device complexity and manufacturing costs while achieving effective water absorption

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If non-essential material is used for water absorption, then water absorption function is added, but long-term display performance reliability deteriorates

Engineering Contradiction:

Improvewater absorption functionVSAvoiddisplay performance reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The organic passivation film is designed to serve dual functions: its primary function of protecting the TFT substrate is enhanced by its secondary function of absorbing water through the groove-shaped through-holes. This eliminates the need for separate adsorbent layers made of non-essential materials, thereby reducing device complexity while maintaining water absorption capability

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 prolongs the lifetime of the liquid crystal display device by efficiently absorbing water without increasing manufacturing costs and maintaining reliability, thereby avoiding black unevenness.

Implementation Method 1

a groove-shaped through-hole is formed in the organic passivation film to surround the display area, a water absorption layer formed of the same material in the same process as that of the organic passivation film is formed within the groove-shaped through-hole

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Implementation Method 2

the water absorption layer is not covered with the inorganic insulating film... efficiently absorbing water entered into a liquid crystal display panel

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentUS12164198B2Liquid crystal display device

Publication Date: 2024.12.10 MAGNOLIA WHITE CORP

AI summary

In order to avoid generation of black unevenness caused by the water intrusion into a liquid crystal display device, there is to provide a liquid crystal display device including a display area and a terminal portion, in which a TFT substrate with an organic passivation film formed and an opposite substrate are adhered to each other by a seal portion and a liquid crystal is enclosed there, wherein in the seal portion of the TFT substrate, a groove-shaped through-hole is formed in the organic passivation film to surround the display area, a water absorption layer formed of the same material in the same process as that of the organic passivation film is formed within the groove-shaped through-hole, and the water absorption layer is not covered with the inorganic insulating film.