Integrated Boost-Buck Power Supply Circuit for OLED Displays
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Solution Overview
Problem
The existing OLED power supply circuits are complex and costly due to the need for multiple power supply chips to provide different voltages required by OLED display devices, particularly the anode and cathode voltages for the AMOLED display, which are essential for light emission.
Innovation Solution
A power supply circuit that integrates a boost circuit and a buck circuit into a single voltage converting sub-circuit, allowing it to generate both anode and cathode voltages, simplifying the circuit structure and reducing manufacturing costs by using a single voltage converting sub-circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple power supply chips are used to provide different voltages for OLED display devices, then the required voltage functions are achieved, but the circuit structure becomes complex and manufacturing cost increases
Solution Approach 1:
The patent merges the boost circuit and buck circuit into a single integrated power supply chip. The chip includes a voltage converting sub-circuit with an inductor that can operate in both boost and buck modes, controlled by control sub-circuits that manage the switching of transistors. This integration eliminates the need for separate power supply chips, directly reducing circuit complexity while maintaining the capability to generate both anode and cathode voltages for OLED displays
Solution Approach 2:
The power supply chip is designed as a universal device that can perform multiple voltage conversion functions. The voltage converting sub-circuit can operate in boost mode to generate the anode voltage and in buck mode to generate the cathode voltage, making a single chip replace multiple specialized chips. This multi-functionality is achieved through shared components (inductor, control logic) that serve both voltage conversion modes
2Adaptability or versatility
If multiple power supply chips are used to provide different voltages for OLED display devices, then the required voltage functions are achieved, but manufacturing cost increases
Solution Approach 1:
The patent merges the boost circuit and buck circuit into a single integrated power supply chip. The chip includes a voltage converting sub-circuit with an inductor that can operate in both boost and buck modes, controlled by control sub-circuits that manage the switching of transistors. This integration eliminates the need for separate power supply chips, directly reducing circuit complexity while maintaining the capability to generate both anode and cathode voltages for OLED displays
Solution Approach 2:
The power supply chip is designed as a universal device that can perform multiple voltage conversion functions. The voltage converting sub-circuit can operate in boost mode to generate the anode voltage and in buck mode to generate the cathode voltage, making a single chip replace multiple specialized chips. This multi-functionality is achieved through shared components (inductor, control logic) that serve both voltage conversion modes
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
This integration simplifies the power supply circuit structure and reduces manufacturing costs while effectively converting input voltage into the required voltages for OLED display devices, supporting both boosting and bucking operations within a single circuit.
Implementation Method 1
the voltage converting sub-circuit comprises an inductor; a first terminal of the inductor is connected to the first node and a second terminal thereof is connected to the second node
Data Source
AI summary
Provided are a power supply circuit, a driving method for the same, and a display device. The power supply circuit comprises a first control sub-circuit, a second control sub-circuit, a voltage converting sub-circuit, a first output sub-circuit, and a second output sub-circuit; the first control sub-circuit controls the first voltage level terminal to be connected to the first node, the second control sub-circuit controls the second voltage level terminal to be connected to the second node, the voltage converting sub-circuit adjusts the voltage at the first node and the voltage at the second node, the first output sub-circuit outputs the voltage at the first node to the first output terminal, the second output sub-circuit outputs the voltage at the second node to the second output terminal. Structure of the power supply circuit can be simplified, and thereby manufacturing cost of the power supply circuit can be reduced.