Liquid Crystal Display Panel Nibble Defect Prevention

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Solution Overview

Problem

In liquid crystal display panels with the Fringe Field Switching (FFS) mode, minute bright point defects occur due to the invasion of nibbles from the inorganic insulating film formed at low temperature, which reduces adhesion strength and leads to thermal deterioration and characteristic changes in the resin film, causing foreign matter to enter the display area.

Innovation Solution

A liquid crystal display panel design where the area without the inorganic insulating film is formed around the liquid crystal inlet, preventing the invasion of nibbles from the inorganic insulating film during the cutting-off process, and the resin film is not formed on the side corresponding to the liquid crystal inlet to enhance adhesiveness, thus reducing the generation of minute bright point defects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If the inorganic insulating film is formed at low temperature on the resin film, then the resin film is protected from thermal deterioration, but the adhesion strength between the inorganic insulating film and resin film decreases, causing nibbles to invade into the display area

Engineering Contradiction:

Improveformation temperature of inorganic insulating filmVSAvoidadhesion strength of inorganic insulating film

Core Design Contradiction:

TemperatureVSStrength

Solution Approach 1:

The patent removes the inorganic insulating film from the liquid crystal inlet area where nibbles are generated during cutting-off, extracting the harmful portion while retaining the protective film in the display area. This resolves the contradiction by eliminating the adhesion problem at the inlet while maintaining thermal protection in the display region.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies different structural configurations to different areas: the inorganic insulating film is formed only in the display area while being removed from the liquid crystal inlet area. This local differentiation allows thermal protection where needed while avoiding adhesion-related nibble generation at the inlet.

Inventive Principle:

Principle #3Local quality

2Reliability

If the resin film is formed to protect underlying structures, then thermal protection is improved, but the resin film undergoes thermal deterioration and characteristic changes when the inorganic insulating film is formed at low temperature

Engineering Contradiction:

Improveprotection of underlying structuresVSAvoidchemical stability of resin film

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent extracts the inorganic insulating film from the liquid crystal inlet area, removing the source of thermal deterioration effects on the resin film while maintaining the protective function in the display area where the film structure remains intact.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If the inorganic insulating film is formed on the resin film to prevent thermal deterioration, then the resin film is protected, but nibbles from the inorganic insulating film invade the display area causing minute bright point defects

Engineering Contradiction:

Improvethermal protection of resin filmVSAvoidminute bright point defects in display area

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the inorganic insulating film formation into two distinct regions: formed in the display area for thermal protection, and removed from the liquid crystal inlet area to prevent nibble generation. This spatial segmentation resolves the contradiction between protection and defect prevention.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different structural configurations are applied locally: the inorganic insulating film is present in the display area to provide thermal protection while being absent from the liquid crystal inlet area to eliminate nibble-related defects.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS8823915B2Liquid crystal display panel

Publication Date: 2014.09.02 MAGNOLIA WHITE CORP

AI summary

Disclosed herein is a liquid crystal display panel in which circumferences of a pair of substrates disposed so as to face each other are stuck at a given distance to each other by a seal material, a liquid crystal inlet is formed in a part of the seal material, and a liquid crystal is sealed in an inner space defined between the substrates paired with each other, the liquid crystal display panel including a resin film being formed on the inner space side of one of the pair of substrates, and an inorganic insulating film being formed on a surface side of the resin film. An area not having the inorganic insulating film being present therein is formed in the liquid crystal panel.