Adaptive Bias Current Regulator for Low-Power Display Driving
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Solution Overview
Problem
Current display devices face challenges in reducing power consumption while maintaining display quality, particularly in regulating voltages and currents efficiently in regulators used within these devices.
Innovation Solution
A regulator is designed with a bias current generation circuit and a current source circuit, including operational amplifiers and switching elements, to control the magnitude of bias current based on input voltages and regulator control signals, optimizing power usage by adjusting current flow according to active and blank periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a regulator maintains a constant bias current to ensure stable voltage regulation, then voltage regulation stability is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by transitioning from a static constant bias current to a dynamic adjustable bias current. The bias current generation circuit responds to control signals and adjusts the bias current magnitude dynamically, allowing the regulator to adapt between stable regulation mode and power-saving mode based on operational requirements.
Solution Approach 2:
The patent implements parameter changes by modifying the bias current parameter from a fixed value to a variable value. Through the current source circuit and switching elements, the bias current parameter can be changed between different magnitudes (first magnitude and second magnitude) to optimize both stability and power consumption under different operating conditions.
2Use of energy by moving object
If the bias current magnitude is reduced to lower power consumption, then power consumption is improved, but voltage regulation characteristics deteriorate
Solution Approach 1:
The patent applies periodic action by switching between different bias current magnitudes based on operational periods. During active periods requiring stable regulation, a higher bias current is supplied; during blank or idle periods, a lower bias current is supplied. This periodic switching optimizes power consumption while maintaining regulation characteristics when needed.
Solution Approach 2:
The regulator dynamically adjusts the bias current magnitude based on control signals, enabling it to operate at different performance levels. This dynamic capability allows the system to reduce power consumption during periods when full regulation performance is not required, while maintaining good regulation characteristics when performance is needed.
3Device complexity
If a fixed bias current is used to simplify circuit design, then device complexity is reduced, but adaptability to different operating conditions decreases
Solution Approach 1:
The patent applies segmentation by dividing the bias current generation into multiple controllable current sources with different current driving capabilities. Each current source can be independently controlled through switching elements, allowing the circuit to select appropriate current levels for different operating conditions while maintaining a structured and manageable design.
Solution Approach 2:
The bias current generation circuit serves multiple functions: it provides stable bias current for voltage regulation, responds to control signals for power management, and adapts to different operating conditions (active and blank periods). This multi-functionality increases adaptability without proportionally increasing complexity.
Data Source
AI summary
A regulator may include a bias current generation circuit including a first input terminal and a second input terminal and configured to generate a bias current in response to at least one of a voltage applied to the first input terminal and a voltage applied to the second input terminal, and a current source circuit including a plurality of current sources connected in parallel and configured to control a magnitude of the bias current. The regulator, the display device including the same, the electronic device including the same, and the method of driving the same according to embodiments of the disclosure may reduce power consumption.