LED Assembly Transistor Drain Cathode Integration
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Solution Overview
Problem
Current LED assemblies face challenges in efficiently controlling the on-off state and brightness of LED cells due to the absence of a dedicated cathode terminal for the n-type LED electrode, leading to suboptimal performance and manufacturing complexities.
Innovation Solution
The LED assembly incorporates a transistor with a drain terminal acting as a cathode terminal for the LED, allowing for precise control of the LED's on-off state and brightness through a driving circuit, and a method of manufacturing that involves forming the LED and transistor layers on a substrate with specific semiconductor materials and processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate cathode terminal is added for the n-type LED electrode, then the LED control performance is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the cathode terminal function with the transistor drain terminal. The drain terminal of the transistor is electrically connected to the n-type LED electrode, eliminating the need for a separate cathode terminal structure. This integration maintains full LED control functionality while reducing overall device complexity.
Solution Approach 2:
The transistor drain terminal serves dual functions: as the output terminal of the transistor for controlling the LED, and simultaneously as the cathode terminal for the LED. This multi-functionality approach reduces the number of components while maintaining complete control capability.
2Reliability
If a separate cathode terminal is added for the n-type LED electrode, then the LED control performance is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The manufacturing process benefits from merging the cathode terminal function into the existing transistor drain terminal structure. This eliminates separate fabrication steps for an additional terminal, reducing manufacturing complexity while achieving improved LED control performance.
3Ease of manufacture
If the transistor drain terminal is used as the cathode terminal, then the manufacturing process is simplified, but the LED control precision may be compromised
Solution Approach 1:
The transistor drain terminal is designed to fulfill both transistor output and LED cathode terminal functions simultaneously. The electrical connection between the drain terminal and n-type LED electrode ensures that control precision is maintained while manufacturing is simplified.
Solution Approach 2:
The drain terminal acts as an intermediary element that bridges the transistor control circuit and the LED n-type electrode. This intermediary structure ensures proper electrical connection and signal transmission, maintaining control precision while reducing overall device complexity.
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 enables efficient control of the LED's on-off state and brightness, improving performance and simplifying the manufacturing process by eliminating the need for a separate cathode terminal, thereby enhancing the overall efficiency and reliability of the LED assembly.
Implementation Method 1
a light source configured to emit light based on an amount of voltage applied across the light source
Implementation Method 2
an optical sensor configured to detect the light emitted by the light source and to generate a sensor current, an amount of which corresponds to an amount of the light detected thereby
Data Source
AI summary
A light source assembly includes a plurality of cells and a driving circuit. Each of the cells includes a transistor and a light source. The transistor includes a drain region that serves as a cathode of the light source. The driving circuit is configured to drive the cell. An optical sensor cell and a method for manufacturing thereof are also disclosed.