Coating Film Protects Conductive Films During Developer Contact

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Solution Overview

Problem

In the manufacturing of liquid crystal display devices, the photosensitive film is often removed more than necessary, and conductive films are damaged due to cell reactions with developers or etchants, leading to issues with the size and resistance of reflective electrodes and gate terminals.

Innovation Solution

A method is introduced where a coating film is formed on the substrate before the photosensitive film, preventing the conductive portions from contacting the developer and reducing cell reactions, and a sacrificial electrode is used to distribute the cell reaction area, minimizing damage and excessive removal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the photosensitive film is exposed to light and then developed, then the pattern is formed, but the conductive films covered with the photosensitive film appear and the developer contacts them causing excessive removal and damage

Engineering Contradiction:

Improvepattern formation accuracyVSAvoiddeveloper contact damage

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

A coating film is introduced as an intermediary layer between the conductive films and the developer. This coating film prevents direct contact between the developer and conductive films during the development process, thereby eliminating the harmful cell reactions that cause excessive photosensitive film removal and conductive film damage, while still allowing the pattern formation to proceed accurately.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The coating film is formed on the conductive films before the photosensitive film is applied and processed. This preliminary protective action ensures that when the photosensitive film is later developed, the conductive films are already protected from developer contact, preventing the harmful effects before they can occur.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If the developer contacts the various conductive films, then the development process completes, but the photosensitive film is removed more than necessary

Engineering Contradiction:

Improvedevelopment process completionVSAvoidphotosensitive film removal

Core Design Contradiction:

ProductivityVSLoss of substance

Solution Approach 1:

The coating film serves as a protective intermediary that allows the development process to complete normally while preventing the developer from contacting the conductive films. This eliminates the cell reactions that cause excessive photosensitive film removal, ensuring that only the intended pattern areas are removed with minimal loss.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If the conductive film makes contact with the developer, then the development proceeds, but the conductive film is damaged

Engineering Contradiction:

Improvedevelopment processVSAvoidconductive film integrity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The coating film acts as a protective intermediary layer that permits the development process to proceed to completion while preventing direct contact between the developer and conductive films. This maintains conductive film integrity and reliability without impeding the development process.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The coating film is applied to the conductive films in advance, before the photosensitive film processing begins. This preliminary protective measure ensures that when development occurs, the conductive films are already shielded, maintaining their integrity throughout the process.

Inventive Principle:

Principle #10Preliminary action

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 method effectively prevents unnecessary removal of the photosensitive film and damage to conductive films, ensuring accurate formation of reflective electrodes and gate terminals with improved size and resistance.

Implementation Method 1

the conductive portions covered with the coating film do not contact the developer. As a result of this, the conductive portions covered with the coating film do not act as an anode or a cathode, and thus a cell reaction will not occur

Methodology Applied

Scientific EffectCell reaction: Redox Reactions

Implementation Method 2

exposing the photosensitive film to light and then developing it

Methodology Applied

Scientific EffectPhotoexposure: Photopolymerisation

Data Source

PatentUS8134162B2Method for manufacturing electronic device and electronic device

Publication Date: 2012.03.13 INNOLUX CORP

AI summary

A method for manufacturing an electronic device comprises a step for forming a coating film (100) on a surface of a conductor portion-containing body (500), a step for forming a photosensitive film (110) on the conductor (500) on which the coating film (100) has been formed, a step for exposing the photosensitive film (110) to a pattern corresponding to a patterned recessed or protruded portion, a step for developing the exposed photosensitive film (110), and a step for baking the developed photosensitive film (110). With this method, an excessive removal of a metal film can be prevented or suppressed.