OLED Conductive Protection Layer Segmentation for Optical Resonance
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in achieving efficient light emission and color representation due to limitations in optical resonance distances and electrode thicknesses, which affect light efficiency and translucency.
Innovation Solution
The design includes a substrate with pixel areas, separated first and second electrodes, intermediate layers, a conductive protection layer, and a connection electrode layer, where the conductive protection layer is thicker than the second and connection electrode layers, and the intermediate and second electrode layers have island-type patterns, optimizing optical resonance distances to enhance light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductive protection layer is made thicker to improve electrical connection reliability, then electrical conductivity is improved, but light translucency deteriorates
Solution Approach 1:
The conductive protection layer is divided into multiple sub-layers with different thicknesses and conductivities. The first conductive sub-layer has greater thickness for reliable electrical connection, while the second conductive sub-layer has lesser thickness to maintain light translucency, thus resolving the contradiction between electrical reliability and optical transparency
Solution Approach 2:
Different regions of the conductive protection layer have different thicknesses and material compositions optimized for their specific functions. Areas requiring higher conductivity have thicker layers, while areas requiring higher transparency have thinner layers, allowing simultaneous optimization of both electrical and optical properties
2Reliability
If the second electrode layer is made thicker to improve electrical conductivity, then electrical connection reliability is improved, but optical resonance distance control becomes more difficult
Solution Approach 1:
The second electrode layer is segmented into multiple sub-layers with different thicknesses. This segmentation allows the overall layer to provide sufficient electrical conductivity while enabling precise control of the optical resonance distance by adjusting the thickness of individual sub-layers independently
Solution Approach 2:
The electrode structure transitions from a single-layer to a multi-layer configuration, adding a dimensional aspect to the design. This allows independent optimization of electrical properties (through total thickness) and optical properties (through individual layer thicknesses and spacing)
3Illumination intensity
If the connection electrode layer is made thinner to improve light translucency, then optical performance is improved, but electrical connection reliability deteriorates
Solution Approach 1:
The connection electrode layer is divided into multiple sub-layers where the first conductive sub-layer provides the necessary electrical connection reliability, while the second conductive sub-layer maintains light translucency with reduced thickness, thus resolving the contradiction between electrical and optical performance
Solution Approach 2:
The connection electrode layer uses composite material structures with different conductivities and optical properties in different sub-layers, allowing the overall structure to achieve both high electrical conductivity and high light translucency simultaneously
4Loss of energy
If the intermediate layers and second electrode layers have island-type patterns to optimize optical resonance, then light efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The intermediate layers and second electrode layers are patterned into island-type structures that correspond to individual pixel areas. This segmentation optimizes optical resonance for each pixel independently, improving light efficiency while the standardized island pattern facilitates systematic manufacturing processes
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 configuration improves light efficiency and translucency by allowing precise control of optical resonance distances and electrode thicknesses, leading to better color representation and overall display performance.
Implementation Method 1
a distance between the second electrode and the connection electrode layer corresponding to at least one of the pixel areas may correspond to an optical resonance distance of light emitted from the at least one of the pixel areas
Data Source
AI summary
An organic light emitting display device has a plurality of first electrodes, intermediate layers, and second electrodes that correspond to a plurality of pixel areas. The first electrodes are spaced from one another, the second electrodes are spaced from one another, and the intermediate layers are spaced from one another. A conductive protection layer is formed over the second electrodes, and a connection electrode layer is formed over the conductive protection layer and electrically connecting the second electrodes.