OLED Voltage Regulator Switching Between Negative Voltage Ranges
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Solution Overview
Problem
The power consumption of voltage regulating devices for organic light emitting diodes (OLEDs) increases significantly when operating in higher negative voltage intervals due to the need for components that can withstand these voltages, leading to increased costs and power consumption, especially when not all environments require high brightness.
Innovation Solution
A voltage regulating device for OLEDs that dynamically switches between operating voltage intervals using a first and second regulator, along with a selector, to generate control voltages based on the reference voltage of the OLED, reducing power consumption by selectively enabling or disabling regulators based on the required voltage interval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage regulating device operates in a higher negative voltage interval to maintain brightness control capability, then the device can still function normally, but the power consumption increases significantly
Solution Approach 1:
The voltage regulating device dynamically switches between a first operating voltage interval (lower negative voltage) and a second operating voltage interval (higher negative voltage) based on the required brightness control range. When the reference voltage is in the first voltage interval, the device operates in the first interval with lower power consumption. When the reference voltage enters the second voltage interval, the device switches to the second interval to maintain operation capability. This dynamic adaptation resolves the contradiction by using lower voltage (lower power) when possible while maintaining high voltage capability when necessary.
Solution Approach 2:
The device changes its operating voltage parameter based on the reference voltage level. By detecting whether the reference voltage is in the first or second voltage interval, the device adjusts its own operating voltage accordingly. This parameter change allows the device to operate at lower power consumption levels when the higher voltage interval is not needed, while still being capable of operating in the higher voltage interval when required for brightness control.
2Adaptability or versatility
If a single regulator is designed to withstand higher negative voltages to ensure operation in all conditions, then the device can operate normally in higher negative voltage intervals, but the hardware cost and power consumption increase
Solution Approach 1:
The voltage regulating device is segmented into two independent regulators: a first regulator for the first operating voltage interval and a second regulator for the second operating voltage interval. Each regulator is optimized for its specific voltage range, with the first regulator designed for lower negative voltages and the second regulator designed for higher negative voltages. This segmentation allows each regulator to be simpler and more efficient for its designated range, avoiding the need for a single complex regulator that must withstand all voltage levels.
Solution Approach 2:
The voltage regulating device achieves multi-functionality by combining two specialized regulators with a selector circuit. The selector circuit directs the appropriate regulator to the output based on the reference voltage level, allowing the system to universally handle both the first and second voltage intervals. This approach provides adaptability across different operating conditions while maintaining efficiency in each specific condition through specialized regulator design.
3Device complexity
If the voltage regulating device uses a fixed operating voltage interval, then the circuit structure is simple, but the device cannot adapt to different reference voltage levels and loses efficiency
Solution Approach 1:
The device transitions from a fixed operating mode to a dynamic switching mode. A selector circuit dynamically selects between the first and second regulators based on the reference voltage level. When the reference voltage is in the first voltage interval, the first regulator is selected; when the reference voltage enters the second voltage interval, the second regulator is selected. This dynamic switching provides adaptability to different reference voltage levels while keeping each individual regulator's structure relatively simple.
Solution Approach 2:
The single fixed regulator is segmented into two specialized regulators, each with a simpler and more optimized structure for its specific voltage range. The selector circuit adds minimal complexity to enable the switching between the two segmented regulators. This segmentation allows each regulator to be simpler in design while the overall system achieves adaptability through the selector mechanism.
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 device effectively reduces power consumption while maintaining normal operation in higher negative voltage intervals by dynamically adjusting the operating voltage interval, thereby saving power and reducing hardware costs.
Implementation Method 1
an operational amplifier OP and a voltage output circuit 531. The operational amplifier OP generates an output voltage according to an input voltage VIN1
Implementation Method 2
The voltage output circuit 531 is controlled by a selection signal SEL to generate a control voltage VINITN selectively using a first operating voltage interval or a second operating voltage interval
Data Source
AI summary
Voltage regulating devices for organic light emitting diodes (OLED) are provided. The voltage regulating device includes an operational amplifier and a voltage output circuit. The operational amplifier generates an output voltage. The voltage output circuit is coupled to the operational amplifier. The voltage output circuit is controlled by a selection signal to generate a control voltage selectively using a first operating voltage interval or a second operating voltage interval. A voltage value of the control voltage is related to a reference voltage of the OLED, and the selection signal is correspondingly generated according to the reference voltage of the OLED.