Organic Light Emitting Display with Oxide Semiconductor Light Conversion Layer
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Solution Overview
Problem
Organic light emitting display apparatuses face limitations in luminescent efficiency due to light being extinguished while passing through electrodes and other members, resulting in reduced brightness and contrast.
Innovation Solution
Incorporating a light conversion layer with an oxide semiconductor between the substrate and the intermediate layer, which has a higher refractive index than the passivation layer, to create a microcavity effect that resonates and amplifies light, improving luminescent efficiency without increasing the overall thickness of the display apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional organic light emitting display apparatus structure is used, then the device can be manufactured with standard processes, but light is extinguished while passing through electrodes and other members, resulting in poor luminescent efficiency
Solution Approach 1:
The patent introduces a light conversion layer with higher refractive index positioned between the substrate and the organic emission layer, creating a microcavity structure that resonates light in the vertical dimension. This dimensional arrangement allows light to be trapped and resonated within the cavity formed by the light conversion layer and the organic emission layer, improving luminescent efficiency without disrupting standard manufacturing processes
Solution Approach 2:
The patent changes the refractive index parameter by introducing a light conversion layer with a higher refractive index than the surrounding layers. This parameter change creates the microcavity effect that resonates light, thereby improving luminescent efficiency while maintaining compatibility with existing manufacturing processes
2Loss of energy
If the thickness of the display apparatus is increased to improve light efficiency, then luminescent efficiency may improve, but the overall thickness of the apparatus increases
Solution Approach 1:
The patent utilizes the vertical dimension within the existing thickness constraints by positioning the light conversion layer at a specific depth between the substrate and the organic emission layer. This creates a microcavity that resonates light vertically, improving luminescent efficiency without requiring increased overall device thickness
Solution Approach 2:
The patent applies local quality by introducing a specific layer (light conversion layer) with distinct optical properties (higher refractive index) at a localized position within the device structure. This localized modification creates the microcavity effect that enhances light efficiency without affecting the overall device thickness
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 enhances light efficiency by resonating light between the intermediate layer and the light conversion layer, and between the intermediate layer and the buffer layer, resulting in improved brightness and contrast without increasing the thickness of the organic light emitting display apparatus.
Implementation Method 1
Incorporating a light conversion layer with an oxide semiconductor between the substrate and the intermediate layer, which has a higher refractive index than the passivation layer, to create a microcavity effect that resonates and amplifies light
Implementation Method 2
The solution enhances light efficiency by resonating light between the intermediate layer and the light conversion layer, and between the intermediate layer and the buffer layer
Data Source
AI summary
An organic light emitting display apparatus includes a substrate, a light conversion layer on the substrate, the light conversion layer including an oxide semiconductor, a passivation layer covering the light conversion layer, a first electrode on the passivation layer, an intermediate layer on the first electrode, the intermediate layer including an organic emission layer, and a second electrode on the intermediate layer.