Common Hole Transport Layer in OLED Subpixels
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Solution Overview
Problem
The complexity of the light-emitting element structure and manufacturing process is increased when forming separate hole transport and electron transport layers for each subpixel, while forming these layers common to all subpixels reduces recombination efficiency in the light-emitting layer.
Innovation Solution
A light-emitting element configuration with a common hole transport layer and separate electron transport and light-emitting layers for each subpixel, where the electron transport layer is optimized for each subpixel to maintain efficiency, and the hole transport layer is shared across all subpixels to simplify the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate hole transport layer and electron transport layer are formed for each subpixel, then transport efficiency of holes and electrons is maintained, but structure complexity and manufacturing complexity increase
Solution Approach 1:
The patent segments the transport layers by function and subpixel: electron transport layers are divided into separate layers for each subpixel (red, green, blue) to optimize electron injection efficiency for each color, while the hole transport layer is kept common across all subpixels. This segmentation strategy maintains transport efficiency where needed while avoiding unnecessary complexity elsewhere.
Solution Approach 2:
The hole transport layer serves as a universal layer for all subpixels (red, green, and blue), performing the same hole transport function across different color regions. This multi-functionality approach eliminates the need for separate hole transport layers for each subpixel, thereby simplifying the overall device structure and manufacturing process while maintaining reliable hole transport efficiency.
2Reliability
If separate hole transport layer and electron transport layer are formed for each subpixel, then transport efficiency is maintained, but manufacturing time increases
Solution Approach 1:
The patent segments the transport layers by function and subpixel: electron transport layers are divided into separate layers for each subpixel (red, green, blue) to optimize electron injection efficiency for each color, while the hole transport layer is kept common across all subpixels. This segmentation strategy maintains transport efficiency where needed while avoiding unnecessary complexity elsewhere.
Solution Approach 2:
The hole transport layer serves as a universal layer for all subpixels (red, green, and blue), performing the same hole transport function across different color regions. This multi-functionality approach eliminates the need for separate hole transport layers for each subpixel, thereby simplifying the overall device structure and manufacturing process.
3Device complexity
If hole transport layer and electron transport layer are formed common to all subpixels, then manufacturing process is simplified, but recombination efficiency in light-emitting layer decreases
Solution Approach 1:
The patent segments the transport layers by function and subpixel: electron transport layers are divided into separate layers for each subpixel (red, green, blue) to optimize electron injection efficiency for each color, while the hole transport layer is kept common across all subpixels. This segmentation strategy maintains transport efficiency where needed while avoiding unnecessary complexity elsewhere.
Solution Approach 2:
The patent applies different structural configurations to different parts of the device: electron transport layers are customized for each subpixel type (red, green, blue) to match the specific electron injection requirements of each color, while the hole transport layer uses a uniform structure suitable for all subpixels. This local quality approach ensures optimal performance in each region without requiring full customization throughout the entire device.
4Ease of manufacture
If hole transport layer and electron transport layer are formed common to all subpixels, then manufacturing process is simplified, but luminous efficiency decreases
Solution Approach 1:
The patent segments the transport layers by function and subpixel: electron transport layers are divided into separate layers for each subpixel (red, green, blue) to optimize electron injection efficiency for each color, while the hole transport layer is kept common across all subpixels. This segmentation strategy maintains transport efficiency where needed while avoiding unnecessary complexity elsewhere.
Solution Approach 2:
The patent applies different structural configurations to different parts of the device: electron transport layers are customized for each subpixel type (red, green, blue) to match the specific electron injection requirements of each color, while the hole transport layer uses a uniform structure suitable for all subpixels. This local quality approach ensures optimal performance in each region without requiring full customization throughout the entire device.
Data Source
AI summary
For a purpose of simplifying a structure of a light-emitting element while maintaining luminous efficiency of the light-emitting element, the present invention provides a light-emitting element including: a cathode electrode; an anode electrode; a light-emitting layer between the cathode electrode and the anode electrode; an electron transport layer between the light-emitting layer and the cathode electrode; and a hole transport layer between the light-emitting layer and the anode electrode. The light-emitting element further includes a plurality of subpixels for each light emission wavelength of the light-emitting layer, the light-emitting layer and the electron transport layer for each of the plurality of subpixels, and the hole transport layer common to at least the plurality of subpixels.