Dual-Gate μ-LED Brightness Control With Temperature Feedback
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Solution Overview
Problem
Current technologies face challenges in controlling and efficiently managing the brightness of micro-light emitting diodes (μ-LEDs) in displays due to their small size, which limits the use of conventional control methods, and requires innovative solutions for precise brightness adjustment and temperature stabilization in augmented reality and automotive applications.
Innovation Solution
A control circuit and method that utilize a dual-gate transistor with a backgate for pulse-width modulation, allowing for space-saving and efficient control of μ-LED brightness, temperature stabilization, and current feedback, reducing the need for additional transistors and improving color accuracy and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional control methods are used for μ-LED brightness control, then the control circuit can be implemented, but the circuit complexity increases and space requirements are not met for compact displays
Solution Approach 1:
The patent combines multiple control functions (brightness control, temperature stabilization, current feedback) into a single dual-gate transistor structure. The first gate controls brightness while the second gate handles temperature stabilization, eliminating the need for separate control circuits and reducing overall device complexity.
Solution Approach 2:
The dual-gate transistor serves multiple functions simultaneously: it acts as a brightness control element, a temperature stabilization element, and a current feedback mechanism. This multi-functionality reduces the number of components needed in the control circuit while maintaining comprehensive control capabilities.
2Measurement precision
If additional transistors are used for brightness control and temperature stabilization, then control precision is improved, but the device area increases
Solution Approach 1:
The patent merges brightness control and temperature stabilization functions into a single dual-gate transistor, thereby achieving precise control of both parameters without requiring separate transistor structures. This integration maintains control precision while minimizing the device footprint.
Solution Approach 2:
The patent utilizes the second gate of the transistor to add a new control dimension for temperature stabilization without expanding the lateral device area. By exploiting the vertical stacking capability of the dual-gate transistor structure, the patent achieves enhanced control functionality within the same planar footprint.
3Ease of manufacture
If conventional LED structures are used, then manufacturing is simpler, but color accuracy and temperature stabilization are insufficient for augmented reality applications
Solution Approach 1:
The patent implements a feedback mechanism through the second gate of the dual-gate transistor that continuously monitors and stabilizes the LED operating temperature. This feedback loop maintains consistent color accuracy by compensating for temperature-induced wavelength shifts, thereby enhancing reliability without complicating the manufacturing process.
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
Enables precise and efficient control of μ-LED brightness and temperature stabilization, achieving high color accuracy and stability, and reducing the complexity of control circuits in compact displays.
Implementation Method 1
micro-light emitting diodes (μ-LEDs)
Implementation Method 2
temperature stabilization, and current feedback
Data Source
AI summary
Disclosed are various aspects of a μ-LED or a μ-LED array for augmented reality or lighting applications, in particular in the automotive field. The μ-LED is characterized by particularly small dimensions in the range of a few μm.