Transparent Micro-LED Pixel Circuit with Single-Transistor RGB Drive
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Solution Overview
Problem
Existing transparent display devices face limitations in increasing the area size of the transmissive area due to the need for multiple transistors to drive red, green, and blue micro-LED elements, which restricts transparency and aesthetic functionality.
Innovation Solution
A pixel circuit design that utilizes one driving transistor to control multiple micro-LED elements, incorporating a storage capacitor and additional transistors to manage data voltage, allowing for increased transmissive area size and improved transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If one driving transistor drives one light-emitting element, then the device complexity is low, but the transmissive area size cannot be increased
Solution Approach 1:
One driving transistor is designed to control multiple light-emitting elements (red, green, and blue micro-LEDs) by time-division multiplexing. The transistor alternates between driving different micro-LEDs based on scan signals, allowing a single transistor to serve multiple functions and thereby increasing the transmissive area without proportionally increasing device complexity
Solution Approach 2:
The driving transistor operates in a periodic manner, switching between different light-emitting elements according to scan signals. This time-division multiplexing approach allows the same transistor to drive different micro-LEDs at different time periods, effectively enabling one transistor to control multiple elements and expand the transmissive area
2Reliability
If multiple transistors are used to drive red, green, and blue micro-LED elements, then each element can be driven independently, but the transmissive area size is limited
Solution Approach 1:
A single driving transistor is designed with multi-functionality to control multiple light-emitting elements (red, green, and blue micro-LEDs) through time-division multiplexing. The transistor alternates between driving different micro-LEDs based on scan signals, allowing one transistor to perform the work of multiple transistors and thereby increase the transmissive area while maintaining driving control capability
Solution Approach 2:
The driving transistor operates periodically, switching between different light-emitting elements according to scan signals. This time-division multiplexing approach maintains reliable driving control for each element at its designated time period while using fewer transistors overall, thus expanding the transmissive area
Data Source
AI summary
Disclosed is a transparent micro-LED unit pixel circuit capable of driving red, green, and blue micro-LED elements with one driving transistor to increase an area size of a transmissive area, and a transparent micro-LED display device including the same. The transparent micro-LED unit pixel circuit includes first to third micro-LEDs emitting light based on a driving current; a driving transistor configured to control the driving current, wherein the driving transistor is disposed between and connected to an anode electrode of each of the first micro-LED, the second micro-LED, and the third micro-LED and a high-potential power line; a storage capacitor disposed between and connected to a gate electrode and a source electrode of the driving transistor; and a first transistor configured to apply a data voltage to the gate electrode of the driving transistor.