Fuse Wire Isolation for Display Substrate Light Leakage

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Solution Overview

Problem

In existing display substrates, light leakage occurs due to current paths between adjacent sub-pixels, causing defects as the light emitting region of one sub-pixel emits light when another adjacent sub-pixel is activated, leading to inefficient light emission and display quality issues.

Innovation Solution

A display substrate design featuring intersecting first electrodes and fuse wires, where the fuse wires are electrically coupled to signal lines and have a fusing point higher than the light emitting layer, allowing for controlled current flow and subsequent burning of the light emitting layer to isolate sub-pixel connections, preventing light leakage by ensuring independent operation of each sub-pixel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a light emitting layer covers the entire display substrate including adjacent sub-pixels, then continuous light emission can be achieved, but light leakage occurs between adjacent sub-pixels causing display quality defects

Engineering Contradiction:

Improvelight emission continuityVSAvoidlight leakage between sub-pixels

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces fuse wires positioned between adjacent sub-pixels that can be selectively fused to segment the continuous light emitting layer into isolated regions. This segmentation prevents current flow and light leakage between adjacent sub-pixels while maintaining continuous light emission within each active sub-pixel region.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The fuse wires act as intermediary elements between adjacent sub-pixels. These wires can be selectively activated to create isolation barriers, serving as controllable mediators that prevent harmful current paths while allowing normal operation of individual sub-pixels.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If pixel defining layers are used to separate adjacent sub-pixels, then light leakage is prevented, but manufacturing complexity and process difficulty increase

Engineering Contradiction:

Improvelight leakage preventionVSAvoidpixel defining layer structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The fuse wires are designed to be selectively discarded (fused) after serving their temporary purpose during manufacturing. Once the isolation function is achieved through selective fusing, the fused wire material is removed or integrated, simplifying the final structure while having prevented light leakage during the critical isolation phase.

Inventive Principle:

Principle #34Discarding and recovering

3Strength

If fuse wires with lower fusing point than light emitting layer are used, then light emitting layer can be protected during fusing process, but light leakage cannot be effectively prevented as the light emitting layer remains intact

Engineering Contradiction:

Improvelight emitting layer integrityVSAvoidlight leakage prevention effectiveness

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

Instead of protecting the light emitting layer during fusing by using lower fusing point materials, the patent inverts the approach by using higher fusing point materials that protect the fuse wire structure itself. This allows the fuse wires to maintain structural integrity while selectively fusing to isolate the light emitting layer, effectively preventing light leakage.

Inventive Principle:

Principle #13The other way round (Inversion)

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 design effectively prevents light leakage by ensuring each sub-pixel operates independently, enhancing display quality and reducing defects by isolating current paths between adjacent sub-pixels, thereby improving the overall performance of the display substrate.

Implementation Method 1

each of the fuse wires has a fusing point higher than that of the light emitting layer, the fuse wires are located at a side of the light emitting layer proximal to the base substrate and are in contact with the light emitting layer

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS10910462B2Display substrate for avoiding light leakage defect, method for manufacturing the same and display device

Publication Date: 2021.02.02 HEFEI XINSHENG OPTOELECTRONICS TECH CO LTD

AI summary

A display substrate, a method for manufacturing the same and a display device are provided. The display substrate includes a base substrate, first electrodes above the base substrate, and a light emitting layer disposed at a side of the first electrodes distal from the base substrate, the display substrate further includes signal lines extending in a first direction and fuse wires extending in a second direction, each fuse wire has a fusing point higher than that of the light emitting layer, the fuse wires are located at a side of the light emitting layer proximal to the base substrate and in contact with the light emitting layer, each fuse wire is electrically coupled to at least two signal lines, and an orthographic projection of at least one first electrode on the base substrate is located between orthographic projections of the at least two signal lines on the base substrate.