Quantum Dot Light-Emitting Transistor Pixel Circuit
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Solution Overview
Problem
Increasing pixel definition in display devices using quantum dots makes it difficult to form multiple circuit elements within each pixel, requiring a reduction in the number of circuit elements while maintaining effective light emission.
Innovation Solution
A display device design that includes a selection transistor and a light-emitting transistor with a channel layer containing quantum dots, where the light-emitting transistor controls light emission by carriers flowing through the channel layer, reducing the number of circuit elements per pixel by integrating functions and using a core-shell quantum dot structure for efficient light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of one pixel is reduced to increase definition, then higher pixel definition is achieved, but forming multiple circuit elements in each pixel becomes more difficult
Solution Approach 1:
The patent combines multiple circuit element functions into fewer transistors by using multi-functional transistor designs where single transistors perform both switching and storage functions, and by integrating the light-emitting function directly into the transistor structure, thereby reducing the total number of circuit elements needed per pixel
Solution Approach 2:
The patent implements multi-functional transistors that simultaneously serve as switching elements, storage elements, and light-emitting elements. The light-emitting transistor's channel layer acts as both the active channel for carrier transport and the light-emitting medium, eliminating the need for separate light-emitting components
2Measurement precision
If the number of circuit elements is reduced, then pixel area is reduced for higher definition, but maintaining effective light emission becomes more difficult
Solution Approach 1:
The patent optimizes the quantum dot parameters including size, composition, and shell structure to enhance light emission efficiency. By controlling quantum dot size distribution and using core-shell structures with appropriate band alignment, the system achieves high quantum efficiency and stable light emission with reduced circuit complexity
Solution Approach 2:
The patent uses composite quantum dot structures with core and shell layers made of different semiconductor materials. The core quantum dots provide light emission while the shell layers passivate surface states and improve quantum efficiency, enabling effective light emission with fewer circuit elements
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 solution allows for a compact pixel design with reduced circuit elements, enabling higher pixel definition and efficient light emission by controlling carrier flow and recombination probability through the quantum dots, thus enhancing display device performance.
Implementation Method 1
a channel layer including quantum dots, and controls the quantum dots to emit light by carriers flowing through the channel layer
Data Source
AI summary
A selection transistor and a light-emitting transistor are formed in a pixel. The selection transistor includes a gate electrode connected to a scan line, a first source/drain electrode connected to a signal line, and a second source/drain electrode. The light-emitting transistor includes a gate electrode connected to the second source/drain electrode of the selection transistor, a first electrode connected to a first line, a second electrode connected to a second line, and a channel layer including quantum dots. The light-emitting transistor controls the quantum dots to emit light by a carrier flowing through the channel layer.