TFT Electrical Connection Structure with Interference Layer

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Solution Overview

Problem

The existing electrical connection structures in thin film transistor (TFT) LCDs suffer from suboptimal optical qualities and reliability due to light exposure affecting the insulating cover, leading to surface roughness and performance issues.

Innovation Solution

An electrical connection structure is developed that includes an interference layer with a reflectance matching the connection line, which, along with a buffer layer and an insulating cover, minimizes light irradiation on the connection line, maintaining a flat and smooth surface by interfering with reflected light.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If light exposure is applied to the electrically insulating cover to impart optical qualities, then the surface receives light treatment, but the optical qualities become suboptimal and surface roughness increases

Engineering Contradiction:

Improvelight exposureVSAvoidsurface roughness

Core Design Contradiction:

Illumination intensityVSManufacturing precision

Solution Approach 1:

The patent converts the harmful effect of light reflection from connection lines (which causes surface roughness and optical defects) into a beneficial interference pattern. By designing an interference layer with specific reflectance that matches the connection line reflectance, the reflected light from connection lines interferes constructively with the incident light, reducing the net light irradiation effect on the insulating cover surface and preventing roughness formation

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the optical parameters of the interference layer (specifically its reflectance) to match the reflectance of the connection lines. This parameter matching creates the desired light interference effect that protects the insulating cover surface from excessive light irradiation during the optical quality treatment process

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If light exposure is applied to the electrically insulating cover, then optical treatment is performed, but reliability of the TFT array substrate deteriorates

Engineering Contradiction:

Improvelight exposureVSAvoidperformance reliability

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent transforms the potentially harmful light exposure process into a beneficial treatment by utilizing light interference. The interference layer, designed with matche d reflectance to the connection lines, creates an interference pattern that modulates the light irradiation on the insulating cover, ensuring optimal optical treatment while maintaining substrate reliability

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Object-affected harmful factors

If the interference layer is designed with reflectance matching the connection line, then light irradiation on the connection line is minimized, but the device structure becomes more complex

Engineering Contradiction:

Improvelight irradiation on connection lineVSAvoidstructure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The interference layer serves multiple functions: it provides the primary optical interference effect to reduce light irradiation on connection lines, maintains a flat surface profile for the insulating cover, and contributes to the overall optical quality of the TFT array substrate. This multi-functionality justifies the additional structural element

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 enhances the optical qualities and reliability of the TFT array substrate by reducing surface roughness and maintaining a flat surface, thereby improving the overall performance of the TFT LCD.

Implementation Method 1

an interference layer with a reflectance matching the connection line, which, along with a buffer layer and an insulating cover, minimizes light irradiation on the connection line, maintaining a flat and smooth surface by interfering with reflected light

Methodology Applied

Scientific EffectLight interference: Interference

Data Source

PatentUS10096620B2Electrical connection structure and thin film transistor array substrate including electrical connection structure

Publication Date: 2018.10.09 HON HAI PRECISION INDUSTRY CO LTD

AI summary

An electrical connection structure providing better optical properties in a display includes an electrical connection unit, an interference layer, and an electrically insulating cover. The interference layer is positioned on a side of the electrical connection unit. The electrically insulating cover is positioned on the other side of the electrical connection unit and formed to cover the electrical connection unit. The electrical connection unit includes a metal layer to reflect light. The interference layer reflects light emitted from the electrically insulating cover towards a first side of the interference layer. A degree of reflectance of the first side of the interference layer is equal to the reflectance of the metal layer.