Organic EL Display Unit Common Light-Emitting Layer
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Solution Overview
Problem
Current organic EL display units face challenges in achieving high light emission efficiency and display performance while minimizing power consumption, particularly due to limitations in light extraction and color separation.
Innovation Solution
The proposed organic EL display unit incorporates a laminated configuration with a common light-emitting layer shared among all devices and individual light-emitting layers for specific colors, along with a transparent conductive layer between the first electrode layer and the organic layer in some devices, to enhance light emission efficiency and reduce the thickness of the light-emitting layer, thereby improving chromaticity and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common light-emitting layer is used for all organic light-emitting devices, then device complexity is reduced and manufacturing is simplified, but light emission efficiency and chromaticity are compromised
Solution Approach 1:
The light-emitting layer is segmented into a common light-emitting layer shared by all devices and individual light-emitting layers specific to each color. This segmentation allows the common layer to provide base functionality while individual layers optimize light emission efficiency and chromaticity for each specific color, resolving the contradiction between structural simplicity and performance.
Solution Approach 2:
The patent merges the common light-emitting layer with individual light-emitting layers to create a composite light-emitting structure. The common layer provides shared functionality across all devices while individual layers add color-specific optimization, achieving both manufacturing simplicity and high light emission efficiency through combination rather than separation.
2Illumination intensity
If the thickness of the light-emitting layer is increased to improve light extraction, then more light can be extracted to outside, but power consumption increases
Solution Approach 1:
The patent optimizes the thickness parameter of the light-emitting layer to achieve the optimal balance between light extraction and power consumption. By carefully controlling the thickness within a specific range, the device extracts sufficient light without requiring excessive layer thickness that would increase power consumption, thus resolving the contradiction through parameter optimization.
3Manufacturing precision
If individual light-emitting layers are added for color separation, then chromaticity is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The light-emitting layer is divided into common and individual components, where individual light-emitting layers are added only where needed for specific colors. This selective segmentation improves chromaticity for colors requiring it while maintaining the simple common layer structure for all devices, thus improving manufacturing precision without uniformly increasing device complexity across all pixels.
Solution Approach 2:
The common light-emitting layer serves as a universal base structure for all organic light-emitting devices regardless of color. This multi-functional layer provides shared functionality while individual layers are added only when needed for color-specific performance, achieving chromaticity improvement without requiring complete restructuring of all device layers.
4Illumination intensity
If a highly reflective metal electrode is used as the first electrode layer, then light extraction from the second electrode layer is improved, but the overall light emission efficiency is limited
Solution Approach 1:
Instead of using a highly reflective metal electrode throughout, the patent applies different properties to different locations: the first electrode layer uses a transparent conductive oxide with appropriate reflectivity for the common light-emitting layer, while individual light-emitting layers have optimized electrode configurations. This local quality differentiation improves overall light emission efficiency by matching electrode properties to specific layer requirements rather than using a uniform highly reflective metal electrode.
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 leads to improved light emission efficiency, chromaticity, and reduced power consumption by allowing for color separation and optimized light extraction, while maintaining a simple and effective display performance.
Implementation Method 1
an organic light-emitting device includes a first electrode layer, an organic layer including a light-emitting layer, and a second electrode layer in order on a base, and is configured to emit light by recombination of electrons and holes that occurs in the light-emitting layer in response to the application of a direct-current voltage between the first electrode layer and the second electrode layer
Data Source
AI summary
There is provided an organic EL display unit having superior light emission efficiency and superior display performance. This display unit includes two or more kinds of organic light-emitting devices, each of the organic light-emitting devices having a laminated configuration in which a first electrode layer, an organic layer, and a second electrode layer are laminated in order on a base, and the organic light-emitting devices configured to emit light of different colors. The organic layer includes a common light-emitting layer and an individual light-emitting layer, the common light-emitting layer shared by all of the kinds of organic light-emitting devices, and the individual light-emitting layer provided in only a kind configured to emit specific color light of the kinds of organic light-emitting devices. Some of the kinds of organic light-emitting devices each include a transparent conductive layer between the first electrode layer and the organic layer.