Light Emitting Device Cross Talk Suppression via Edge Coverage
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Solution Overview
Problem
Light emitting devices with organic or inorganic materials face issues of cross talk and initial failure due to equipotential surfaces, leading to reduced display quality and shortened lifetimes, especially when multiple light emitting elements are laminated.
Innovation Solution
A light emitting device design where each light emitting element has a conductive layer between multiple light emitting bodies, with the edge portion of the conductive layer covered by the light emitting bodies to prevent cross talk and initial failure, ensuring high current efficiency and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light emitting elements are laminated to increase luminance, then luminance is improved, but cross talk between adjacent pixels is caused due to equipotential surfaces
Solution Approach 1:
The patent extracts and removes the harmful equipotential surface (conductive layer) from the structure. By eliminating the ITO conductive layer that causes cross talk between adjacent pixels, the invention prevents the harmful electrical interaction while maintaining the light emitting function through alternative electrode designs.
Solution Approach 2:
The patent introduces an insulating layer as an intermediary between adjacent light emitting elements. This insulating layer acts as a mediator that prevents direct electrical contact and cross talk between pixels, while still allowing the structure to support multiple laminated light emitting elements for high luminance.
2Reliability
If equipotential surface is formed to correspond to light emitting region, then electrical connection is improved, but misalignment causes difference in brightness or non-light emitting regions
Solution Approach 1:
The patent segments the conductive and insulating layers into distinct, separately formed structures. By creating the insulating layer pattern first and then forming conductive layers in specific regions, the invention allows independent alignment adjustment of each layer, eliminating misalignment issues between the equipotential surface and light emitting region.
Solution Approach 2:
The patent performs preliminary formation of the insulating layer structure before adding conductive layers. This preliminary action establishes a precise reference framework that guides subsequent conductive layer deposition, ensuring accurate alignment between the equipotential surface and light emitting regions without requiring perfect simultaneous alignment.
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
The solution effectively inhibits cross talk and initial failure, enhancing display quality and extending the lifetime of light emitting devices by maintaining high current efficiency and precise light emission.
Implementation Method 1
By applying current to the light emitting element, a light emitting material is excited and so on so as to obtain a predetermined emission color
Data Source
AI summary
To provide a light emitting device in which generation of cross talk between adjacent light emitting elements is suppressed, even when the light emitting device uses a light emitting element having high current efficiency. Also, to provide a light emitting device having high display quality even when the light emitting device uses a light emitting element having high current efficiency. The light emitting device has a pixel portion including a plurality of light emitting elements, wherein each of the plurality of light emitting elements includes a plurality of light emitting bodies provided between a first electrode and a second electrode and a conductive layer formed between the plurality of light emitting bodies, wherein the conductive layer is provided for each light emitting element, and wherein an edge portion of the conductive layer is covered with the plurality of light emitting bodies.