Pixel Electrode Structure for Display Devices
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Solution Overview
Problem
Existing display devices face challenges in achieving high electrical conductivity and physical strength for pixel electrodes, which are crucial for reliable operation and durability.
Innovation Solution
A pixel electrode structure comprising a first electrode layer with organic matter derived from an organic layer and a second electrode layer without organic matter, both made of metal oxides like IZO or ITO, with the first layer being thinner and directly on the organic layer, and the second layer thicker and directly on the first electrode layer, formed using a sputtering method, and optionally a third electrode layer without organic matter on top, all contributing to enhanced physical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pixel electrode is made with high electrical conductivity materials, then electrical conductivity is improved, but physical strength deteriorates
Solution Approach 1:
The pixel electrode uses a composite structure with a first electrode layer containing organic matter (carbon trioxide and/or carbon) and a second electrode layer without organic matter. This composite material approach allows the first layer to provide electrical conductivity while the second layer provides physical strength, resolving the contradiction between electrical conductivity and physical strength requirements.
2Reliability
If organic matter is introduced into the pixel electrode to improve conductivity, then electrical conductivity is improved, but electrode integrity deteriorates
Solution Approach 1:
The pixel electrode is segmented into two distinct layers: a first electrode layer containing organic matter for electrical conductivity, and a second electrode layer without organic matter for structural integrity. This segmentation allows each layer to fulfill its specific function without compromising the other, resolving the contradiction between conductivity enhancement and electrode integrity.
Solution Approach 2:
The first electrode layer containing organic matter acts as an intermediary layer between the organic layer and the second electrode layer. It facilitates electrical conductivity while the second layer serves as a protective barrier that maintains electrode integrity, with the vacuum state acting as a mediator to prevent organic matter contamination during manufacturing.
3Strength
If a thicker electrode layer is used to improve physical strength, then physical strength is improved, but manufacturing complexity increases
Solution Approach 1:
Instead of manufacturing a single thick electrode layer, the structure is segmented into a thinner first electrode layer (50-100 μm) and a thicker second electrode layer. This segmentation allows the second layer to provide the required physical strength while the first layer provides conductivity, and the manufacturing process is simplified by forming layers sequentially with vacuum treatment between them.
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 structure enhances the physical strength of pixel electrodes, reducing the risk of damage and improving electrical conductivity, while the manufacturing method ensures minimal introduction of organic matter into the second electrode layer, thereby maintaining electrode integrity and performance.
Implementation Method 1
the first electrode layer and the second electrode layer may each be formed via a sputtering method
Data Source
AI summary
A display device includes: a base substrate, a transistor disposed on the base substrate, an organic layer disposed on the transistor, a display element layer disposed on the organic layer, and a pixel electrode disposed between the organic layer and the display element layer. The pixel electrode includes a first electrode layer disposed between the organic layer and the display element layer and containing an organic matter derived from the organic layer, and a second electrode layer disposed between the first electrode and the display element layer and not containing the organic matter.