Quantum Dot Pixel Structure With Inorganic Layer for Electron Injection
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Solution Overview
Problem
Existing quantum dot light-emitting elements face challenges in achieving efficient electron injection and transport, which affects light efficiency and display performance.
Innovation Solution
A display device structure is proposed, including a base layer, an insulating layer, a pixel defining film, a light-emitting element with a quantum dot light-emitting layer, and an inorganic layer that overlaps the pixel defining film, providing proton supply to enhance electron transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are used in the light-emitting layer to achieve high color purity and high light-emitting efficiency, then display quality is improved, but efficient electron injection and transport becomes more difficult to achieve
Solution Approach 1:
The patent introduces an inorganic layer as an intermediary component between the electron transport region and the light-emitting layer. This inorganic layer serves as a mediator that facilitates electron injection from the electron transport region into the quantum dot light-emitting layer, resolving the contradiction by providing a specialized interface that improves electron transfer efficiency while maintaining the high light-emitting efficiency of the quantum dot structure
Solution Approach 2:
The patent modifies the structural parameters of the light-emitting element by introducing the inorganic layer with specific material properties and positioning it at a critical interface. This parameter change (adding a new layer with different electrical and physical properties) enables improved electron injection and transport without compromising the quantum dot light-emitting efficiency
2Reliability
If the inorganic layer is disposed more inward than the pixel defining film edge to overlap the pixel defining film, then electron transport is enhanced, but device complexity increases
Solution Approach 1:
The inorganic layer serves multiple functions simultaneously: it acts as an electron injection facilitator, provides structural support at the pixel boundary, and serves as a barrier layer. By making this single layer multi-functional, the patent reduces the need for additional separate components, thereby limiting the increase in device complexity while still achieving improved electron transport
3Illumination intensity
If the inorganic layer covers the edge of the first electrode to provide proton supply, then light-emitting efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The inorganic layer is formed and positioned in advance during the manufacturing process, before the final assembly steps. By establishing the inorganic layer's position and structure early in the manufacturing sequence, the patent enables subsequent layers and components to be built upon this predetermined structure, thereby reducing the cumulative precision requirements across multiple manufacturing steps
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 proposed solution improves light-emitting efficiency and display efficiency by facilitating effective electron transport and injection, leading to enhanced performance of the quantum dot light-emitting elements.
Implementation Method 1
an inorganic layer disposed on the insulating layer and including an edge which is disposed more inward than an edge of the pixel defining film and overlaps the pixel defining film in a plan view... providing proton supply to enhance electron transport
Data Source
AI summary
A display device includes a base layer, an insulating layer disposed on the base layer, a pixel defining film disposed on the insulating layer and having a pixel opening, a light-emitting element disposed on the insulating layer, and an inorganic layer disposed on the insulating layer and including an edge disposed more inward than an edge of the pixel defining film. The light-emitting element includes a first electrode, a second electrode, a light-emitting layer including quantum dots and disposed between the first electrode and the second electrode, a hole transport region, and an electron transport region including a metal oxide, spaced apart from the hole transport region, and disposed between the first electrode and the second electrode.