SWCNT Control Circuits for Crystalline LED Displays
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Solution Overview
Problem
Active matrix liquid crystal display (AMLCD) panels face issues with false off-state pixels due to backlight requirements and low field effect mobilities of amorphous silicon thin film transistors, which limit the performance and durability of emissive organic light emitting diode (OLED) displays.
Innovation Solution
Integration of single-walled carbon nanotubes (SWCNT) control circuits with light-emitting diode pixels made of crystalline semiconductors, featuring N and P electrodes, SWCNT switching transistors, driving transistors, and charge storage capacitors, to enhance current delivery and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If amorphous silicon thin film transistors are used in control circuits, then device complexity is reduced and ease of manufacture is improved, but field effect mobility is insufficient to provide adequate current for LED pixels
Solution Approach 1:
The patent changes the material parameter of the transistor from amorphous silicon to single-walled carbon nanotubes, which fundamentally alters the field effect mobility characteristic while maintaining the thin-film transistor structure and fabrication compatibility
Solution Approach 2:
The patent employs composite material structure by integrating single-walled carbon nanotubes within a thin-film transistor architecture, combining the high mobility of carbon nanotubes with the manufacturing advantages of thin-film processing techniques
2Device complexity
If organic light emitting diodes are used, then device complexity is reduced compared to LCD with backlight, but lifetime and stability are limited due to inherent instability of organic materials
Solution Approach 1:
The patent changes the emitter material from organic compounds to inorganic crystalline semiconductors, fundamentally improving the lifetime and stability parameters while maintaining the direct-emissive display architecture that eliminates the need for backlight layers
3Duration of action of stationary object
If inorganic crystalline semiconductor LEDs are used, then lifetime and efficiency are improved, but control circuit integration becomes more challenging
Solution Approach 1:
The patent changes the transistor material to carbon nanotubes, which can be deposited at lower temperatures compatible with inorganic LED structures, and enables solution-based processing that simplifies integration with crystalline semiconductor LEDs
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 SWCNT control circuits provide high field effect mobility and low power consumption, enabling bright and durable active matrix LED displays suitable for indoor and outdoor applications with improved reliability and efficiency.
Implementation Method 1
single-walled carbon nanotubes transistor (SWCNT) circuits that have light emitting diode pixels made of crystalline semiconductors with individual N and P electrodes, single-walled carbon nanotubes switching transistors (Ts); single-walled carbon nanotubes driving transistors (Td)
Implementation Method 2
light emitting diode pixels made of crystalline semiconductors with individual N and P electrodes
Implementation Method 3
application of a voltage greater than 2.5 V to the light emitting diode pixels results in light emission
Implementation Method 4
charge storage capacitors (Cs)
Data Source
AI summary
An active matrix light emitting diodes display module integrated with single-walled carbon nanotubes control circuits includes a light emitting diode pixel having a crystalline semiconductor light emitting diode, single-walled carbon nanotubes switching transistors and a charge storage capacitor.