Display Device Insulating Layers Prevent Crosstalk
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Solution Overview
Problem
Display devices with shared light-emitting layers often experience leakage current, leading to crosstalk between adjacent light-emitting elements, which degrades display quality and resolution.
Innovation Solution
A display device design where the light-emitting layer is divided between light-emitting elements, using a structure with a first and second organic and inorganic insulating layer, and a common electrode, with projecting portions to separate the EL layers and reduce leakage current, allowing for independent operation of each light-emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a shared light-emitting layer is used for multiple light-emitting elements, then manufacturing complexity is reduced and production efficiency is improved, but leakage current occurs between elements causing crosstalk and degrading display quality
Solution Approach 1:
The patent divides the light-emitting layer into separate independent layers for each light-emitting element by introducing insulating layers (first and second inorganic insulating layers with projecting portions) that physically separate the EL layers. This segmentation prevents leakage current between adjacent elements while maintaining manufacturing efficiency through the use of a shared common electrode and simultaneous formation process.
2Ease of manufacture
If a continuous light-emitting layer is shared between light-emitting elements, then the number of manufacturing steps is reduced, but crosstalk occurs due to leakage current between elements
Solution Approach 1:
The patent introduces insulating layers (first and second inorganic insulating layers with projecting portions) as intermediary structures between adjacent light-emitting elements. These intermediary layers physically separate the light-emitting layers, blocking leakage current and preventing crosstalk, while allowing the overall structure to be manufactured in an integrated fashion with a shared common electrode.
3Device complexity
If light-emitting elements share a common light-emitting layer, then device complexity is reduced, but display resolution is degraded due to crosstalk between adjacent elements
Solution Approach 1:
The patent achieves high display resolution by segmenting the light-emitting layers into independent units for each pixel element. The first and second inorganic insulating layers with projecting portions create physical boundaries that prevent optical crosstalk between adjacent elements, enabling sharp image definition while maintaining a relatively simple overall device structure through shared components.
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 suppresses crosstalk, enhancing display quality, resolution, and reliability by ensuring each light-emitting element operates independently, resulting in improved contrast and emission efficiency.
Implementation Method 1
a first inorganic insulating layer having a first projecting portion overlapping with the depressed portion, a second inorganic insulating layer having a second projecting portion overlapping with the depressed portion
Implementation Method 2
light-emitting elements (also referred to as EL elements or EL devices) utilizing an electroluminescence (EL) phenomenon
Data Source
AI summary
A display device with high display quality is provided. The display device includes a first organic insulating layer, a first inorganic insulating layer and a second inorganic insulating layer over the first organic insulating layer, a first light-emitting element, a second light-emitting element, and a second organic insulating layer. The first light-emitting element includes a first pixel electrode over the first inorganic insulating layer, a first EL layer over the first pixel electrode, and a common electrode over the first EL layer. The second light-emitting element includes a second pixel electrode over the second inorganic insulating layer, a second EL layer over the second pixel electrode, and the common electrode over the second EL layer. The second organic insulating layer is provided between the first EL layer and the second EL layer, and the common electrode is provided over the second organic insulating layer. The first organic insulating layer includes a depressed portion in a region overlapping with the second organic insulating layer, the first inorganic insulating layer includes a first projecting portion overlapping with the depressed portion, and the second inorganic insulating layer includes a second projecting portion overlapping with the depressed portion.