Embedded Source Electrodes in OLED Transistor Arrays
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Solution Overview
Problem
The complex fabrication process and high production cost of active driving type organic electroluminescent displays, particularly due to uncontrolled carriers at the edge of source electrode units in the vertical structure, necessitate an integrated solution for organic thin film transistors and light emitting diodes.
Innovation Solution
An organic electroluminescent transistor array substrate is developed with a substrate, gate layer, gate insulating layer, semiconductor layer, source layer, pixel defining layer, and drain layer, where source electrode units are embedded within pixel defining units, allowing for controlled carrier recombination and uniform electric fields across sub-pixel units, utilizing materials like amorphous silicon and indium gallium zinc oxide for enhanced carrier transport and luminance adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If active driving type organic electroluminescent display is used, then low driving voltage and high definition are achieved, but fabrication process becomes complicated and production cost increases
Solution Approach 1:
The patent combines the transistor and light-emitting diode into a single integrated structure where the source layer serves dual functions as both the transistor source electrode and the LED anode. The pixel defining layer is integrated into the same fabrication sequence, merging multiple device functions into one unified structure that simplifies the overall fabrication process while maintaining active driving capabilities
Solution Approach 2:
The source layer is designed to perform multiple functions: it acts as the source electrode for the transistor, the anode for the light-emitting diode, and provides carrier injection for both functions. This multi-functional design reduces the number of separate components and fabrication steps required, directly addressing the complexity issue
2Reliability
If vertical structure with source layer and pixel defining layer is used, then carrier control is improved, but fabrication complexity increases due to multiple layers
Solution Approach 1:
The pixel defining layer is merged with the transistor source/drain structure in a way that it simultaneously defines the pixel boundaries and serves as part of the electrical structure. This integration allows carrier control functionality to be achieved without adding independent complex layers, as the pixel defining layer fulfills multiple roles
3Reliability
If source electrode units are embedded within pixel defining units, then uniform electric fields and controlled carrier transport are achieved, but fabrication precision requirements increase
Solution Approach 1:
The pixel defining layer is formed first to establish the pixel boundaries and structural framework, and then the source electrode units are formed within these pre-defined regions. This preliminary action of creating the pixel defining structure first provides clear boundaries and alignment references that guide subsequent source electrode formation, making the embedding process more controllable and precise
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 ensures uniform electric fields and controlled carrier transport, reducing production costs and simplifying the fabrication process while improving luminance and light emitting efficiency by embedding source electrode units within pixel defining units, thus addressing the uncontrolled carrier issue at the edge of source electrode units.
Implementation Method 1
an organic electroluminescent material as a light emitting body
Data Source
AI summary
An embodiment of the present disclosure provides an organic electroluminescent transistor array substrate, including a substrate, and a gate layer, a gate insulating layer, a semiconductor layer, a source layer, a pixel defining layer, an electroluminescent layer and a drain layer formed on the substrate, wherein, the source layer and the drain layer are located in different levels, the source layer includes plural source electrode units corresponding to sub-pixel units respectively, the pixel defining layer includes plural pixel defining units corresponding to the source electrode units respectively, and the respective source electrode units are embedded within the pixel defining units corresponding thereto.