Micro LED Driving Circuit Gamma Curve Linear Region
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Solution Overview
Problem
Micro light-emitting diode driving circuits face challenges in minimizing power consumption, as existing technologies result in broad working ranges that are difficult to tune for low power operation.
Innovation Solution
A micro light-emitting diode driving circuit with a digital-to-analog converter and a driving transistor, where grayscale voltage levels are determined by a gamma curve, and at least one-sixteenth of these levels are within the linear region of the current-voltage curves, allowing for a reduced accessible working range of about 2 volts, enabling lower power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional driving circuits are used with broad working ranges, then the circuit can operate over a wide voltage range, but power consumption cannot be minimized
Solution Approach 1:
The patent applies parameter changes by carefully selecting and optimizing the driving voltage value to position it within the linear region of the transistor's current-voltage characteristics. This specific parameter selection enables the micro LED to operate with reduced power consumption while maintaining adequate brightness, directly resolving the contradiction between energy efficiency and operational flexibility
2Use of energy by moving object
If the accessible working range is reduced to about 2 volts, then power consumption is reduced, but the circuit becomes more difficult to tune
Solution Approach 1:
The patent implements preliminary action by pre-calculating and pre-positioning the driving voltage within the linear region before the circuit operates. The gamma curve is pre-determined to map grayscale values to appropriate voltage levels, ensuring that the micro LED operates within the optimal 2-volt range from the outset. This eliminates the need for complex real-time tuning while maintaining low power consumption
3Use of energy by moving object
If grayscale voltage levels are determined by gamma curve with one-sixteenth within linear region, then power consumption is minimized, but the device complexity increases
Solution Approach 1:
The patent introduces the gamma curve as an intermediary element that translates grayscale values into optimized voltage levels. This mathematical function serves as a mediator between the digital control signals and the physical LED operation, enabling low power consumption through software-based optimization rather than complex hardware modifications. The gamma curve calculation ensures that one-sixteenth of the grayscale levels operate within the linear region, achieving energy efficiency without significantly increasing physical 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
The solution achieves low power consumption by ensuring that the micro light-emitting diode operates within a narrower accessible working range, allowing for efficient driving with lower voltages compared to conventional OLEDs, thereby reducing overall power usage.
Implementation Method 1
The digital-to-analog converter is electrically coupled to a gate terminal of the driving transistor and is configured to provide grayscale voltage levels of the micro light-emitting diode to the driving circuit and the micro light-emitting diode
Implementation Method 2
a micro light-emitting diode 110
Implementation Method 3
micro light-emitting diode devices, displays, or driving circuits
Data Source
AI summary
A micro light-emitting diode driving circuit including a micro light-emitting diode, a driving circuit, and a digital-to-analog converter is provided. The driving circuit includes a driving transistor electrically coupled to the micro light-emitting diode in series. The digital-to-analog converter is electrically coupled to a gate terminal of the driving transistor and is configured to provide grayscale voltage levels of the micro light-emitting diode to the driving circuit and the micro light-emitting diode. The grayscale voltage levels are determined by a gamma curve. A driving voltage is applied to the driving transistor and the micro light-emitting diode, such that at least one-sixteenth of the whole grayscale voltage levels of the micro light-emitting diode is within a linear region of at least one of current-voltage curves of the driving transistor. An accessible working range of the micro light-emitting diode is about 2 volts.