Quantum Dot Display Electrode Layout With Integrated Reflective Bank
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Solution Overview
Problem
Current display device manufacturing processes are complex and costly due to the need for multiple steps and masks in forming the reflective electrode layer and transistor electrodes, which complicates the integration with the color conversion layer.
Innovation Solution
The display device incorporates a reflective electrode layer and transistor electrodes formed on the same layer as the bank, simplifying the process by integrating these components with the color conversion layer, reducing the number of masks required and thus lowering production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the reflective electrode layer and transistor electrodes are formed separately using multiple masks, then the manufacturing precision can be maintained, but the device complexity and production cost increase
Solution Approach 1:
The patent combines the formation of the reflective electrode layer and transistor electrodes into a single simultaneous deposition process. The reflective electrode layer is formed on the bank while the transistor electrodes are formed on the interlayer insulating layer in the same process step, eliminating the need for separate masking operations and reducing overall process complexity while maintaining manufacturing precision through unified process control
Solution Approach 2:
The single deposition process serves multiple functions: it creates both the reflective electrode layer for light extraction enhancement and the transistor electrodes for electrical connection simultaneously. This multi-functional approach reduces the number of process steps and masks required, directly addressing the contradiction between precision and complexity
2Manufacturing precision
If multiple masks are used for forming electrode layers, then the manufacturing precision can be maintained, but the productivity decreases due to increased process steps
Solution Approach 1:
The patent merges multiple electrode formation operations into a single deposition process. By forming both the reflective electrode layer and transistor electrodes simultaneously in one step, the number of process cycles is reduced, directly improving manufacturing efficiency and productivity while maintaining the required pattern precision through unified process design
Solution Approach 2:
The reflective electrode layer is formed preliminarily on the bank structure before final electrode patterning is completed. This preliminary formation allows subsequent processes to build upon an already-established reflective layer, reducing the total number of deposition steps required and improving overall manufacturing throughput
3Illumination intensity
If the reflective electrode layer is formed separately, then the light output efficiency can be optimized, but the manufacturing cost increases
Solution Approach 1:
The patent combines the formation of the reflective electrode layer with transistor electrode formation in a single process step. This integration maintains the optical performance benefits of a dedicated reflective layer by ensuring proper material composition and thickness, while simultaneously reducing material waste and process costs associated with separate formation operations
Solution Approach 2:
The deposition process is designed to create both optically-functional reflective layers and electrically-functional transistor electrodes with a single material deposition. This multi-functionality ensures that the reflective layer achieves optimal light extraction properties while the same process step creates necessary electrical connections, eliminating the need for additional costly processing 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
This approach simplifies the manufacturing process, reduces costs, and enhances light output efficiency by allowing for a more integrated reflective structure, while maintaining the functionality of the color conversion layer.
Implementation Method 1
a color conversion layer disposed between banks and including quantum dots that change a color of light
Implementation Method 2
A reflective electrode layer may be disposed on the bank
Data Source
AI summary
A display device includes a transistor on a base layer, the transistor including an active layer, a gate electrode, a first transistor electrode electrically connected to a first contact region of the active layer, and a second transistor electrode electrically connected to a second contact region of the active layer; an interlayer insulating layer on the gate electrode; a bank on the interlayer insulating layer and protruding in a thickness direction of the base layer; a color conversion layer between banks and including quantum dots that change a color of light; and a light emitting element on the color conversion layer, and a reflective electrode layer is on the bank.