Display Insulating Layer Layout for Low Leakage and Higher Storage

Solution Overview

Problem

Display devices, such as LCD and OLED, face challenges in reducing resistance, current leakage, and improving storage capacity to meet customer demands for enhanced display quality.

Innovation Solution

A display device structure featuring a first substrate with a first and second insulating layer, where the second insulating layer under the metal layer is thicker than that exposed, with the metal layer comprising conductive lines and an opening region, optimizing the thickness ratio to decrease resistance and increase storage capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the thickness of the second insulating layer under the metal layer is increased, then resistance decreases and current leakage reduces, but storage capacity in pixels decreases

Engineering Contradiction:

Improvecurrent leakageVSAvoidstorage capacity

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent applies local quality by creating a thickness gradient in the second insulating layer, where the thickness varies depending on the location: thicker under the metal layer (for low resistance and current leakage) and thinner in the opening region (for high storage capacity). This spatial variation in thickness optimizes both contradictory requirements in different regions of the same structure.

Inventive Principle:

Principle #3Local quality

2Reliability

If the thickness of the second insulating layer under the metal layer is increased, then resistance decreases, but device complexity increases

Engineering Contradiction:

ImproveresistanceVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the physical parameter of the second insulating layer thickness to resolve the contradiction. By adjusting the thickness parameter spatially (thicker under metal, thinner in openings), the patent achieves lower resistance without adding complex multi-layer structures or additional components, thus maintaining structural simplicity while improving electrical performance.

Inventive Principle:

Principle #35Parameter changes

3Quantity of substance

If the thickness of the second insulating layer in the opening region is decreased, then storage capacity increases, but current leakage increases

Engineering Contradiction:

Improvestorage capacityVSAvoidcurrent leakage

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent applies local quality by creating a thickness gradient in the second insulating layer, where the thickness varies depending on the location: thicker under the metal layer (for low resistance and current leakage) and thinner in the opening region (for high storage capacity). This spatial variation in thickness optimizes both contradictory requirements in different regions of the same structure.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12156436B2Electronic device comprising a light emitting layer and a second metal layer that covers a part of a second insulating layer

Publication Date: 2024.11.26 RED OAK INNOVATIONS LTD

AI summary

An electronic device includes: a substrate, a poly-silicon layer disposed on the substrate, a first metal layer disposed on the substrate, a first insulating layer disposed on the first metal layer, a second insulating layer disposed on the first insulating layer; and a second metal layer covering a part of the second insulating layer and electrically connected to the first metal layer. Wherein a thickness of the second insulating layer under the second metal layer is larger than a thickness of the second insulating layer uncovered with the second metal layer.