Organic Electroluminescent Display with Resonance Auxiliary Layers
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Solution Overview
Problem
Current organic electroluminescent display apparatuses face challenges in achieving high luminous efficiency, longevity, and display quality due to limitations in light-emitting layer structures and voltage management.
Innovation Solution
The apparatus includes a base substrate with specific pixel regions, a hole transport region, light-emitting units with multiple layers, a common layer, resonance auxiliary layers, and electron transport regions, along with electrodes, which are strategically layered and doped to optimize hole and electron injection, prevent exciton quenching, and manage driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional light-emitting layer structure is used, then the device structure is simple, but the luminous efficiency is low
Solution Approach 1:
The light-emitting layer is divided into multiple sub-layers (first light-emitting layer, second light-emitting layer, third light-emitting layer) with different functions. Each sub-layer has specific thickness and material composition optimized for its role in exciton management and light emission, enabling high luminous efficiency through functional segmentation.
Solution Approach 2:
Different regions of the light-emitting layer have different properties: the first light-emitting layer has specific thickness for hole injection, the second light-emitting layer has different thickness for electron injection, and the third light-emitting layer has specific properties for exciton recombination. This local optimization of layer properties maximizes overall luminous efficiency.
2Use of energy by moving object
If the light-emitting layer structure is optimized for high efficiency, then luminous efficiency improves, but exciton quenching occurs at pixel boundaries
Solution Approach 1:
A common layer is introduced as an intermediary between adjacent pixel regions. This common layer has specific energy level characteristics that prevent exciton quenching at pixel boundaries while maintaining efficient light emission in the pixel regions. The common layer acts as a buffer that manages exciton behavior at interfaces.
Solution Approach 2:
Instead of trying to contain excitons within pixel regions, the invention inverts the approach by creating a common layer that actively manages exciton behavior at boundaries. The common layer has properties that are opposite to the pixel region layers, creating a potential barrier that prevents exciton leakage while maintaining overall device efficiency.
3Power
If doping is applied to resonance auxiliary layers, then driving voltage is reduced, but manufacturing complexity increases
Solution Approach 1:
The resonance auxiliary layers are doped with specific materials at controlled concentrations to modify their electrical properties. By changing the doping parameters (material type, concentration, depth), the driving voltage is reduced while maintaining manufacturability through established doping techniques.
Solution Approach 2:
The doping process uses relatively simple and cost-effective dopant materials that can be deposited using standard thin-film techniques. The doping is applied only to specific resonance auxiliary layers rather than the entire device, reducing overall manufacturing complexity while achieving the voltage reduction benefit.
4Manufacturing precision
If multiple light-emitting layers are used for color accuracy, then display quality improves, but device complexity increases
Solution Approach 1:
The display is divided into multiple pixel regions (first pixel region, second pixel region, third pixel region) with each region containing light-emitting layers optimized for specific color emissions. This segmentation enables precise color control while maintaining a systematic structure that is manageable in manufacturing.
Solution Approach 2:
The common layer serves multiple functions: it prevents exciton quenching, manages electron-hole recombination, and provides a uniform base for multiple pixel regions. This multi-functionality reduces the need for additional specialized layers, thereby controlling device complexity while maintaining color accuracy.
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 enhances luminous efficiency, extends the longevity of the display, and improves display quality by preventing leakage currents and ensuring accurate color emission, thereby reducing power consumption and maintaining high gradation images.
Implementation Method 1
a first resonance auxiliary layer disposed on the first pixel region, and disposed between the common layer and the hole transport region; a second resonance auxiliary layer disposed on the second pixel region, and disposed between the second light-emitting layer and the common layer
Implementation Method 2
Holes supplied from the anode electrode and electrons supplied from the cathode electrode are combined in the light-emitting unit to form excitons, and then light corresponding to energy between the holes and the electrons is generated from the excitons
Data Source
AI summary
An organic electroluminescent display apparatus includes: a base substrate; a first electrode; a hole transport region; a light-emitting unit; a common layer; a first resonance auxiliary layer; a second resonance auxiliary layer; an electron transport region; and a second electrode. The light-emitting unit includes a first light-emitting layer disposed on the first pixel region and a second light-emitting layer disposed on the second pixel region. The first resonance auxiliary layer and the second resonance auxiliary layer may be separated from the common layer.