OLED Power Supply Segmentation for Low Quiescent Current
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Solution Overview
Problem
Organic light emitting displays face high quiescent current consumption during low power display modes due to the need for a direct current generator to produce both high and low voltages, which increases power consumption and inefficiency.
Innovation Solution
An organic light emitting display system that uses a driver integrated circuit to supply high and low voltages during low power modes, eliminating the need for a charge pump and reducing power consumption by switching between standard and low power modes using a second power supply with a smaller voltage difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a direct current generator is used to generate both high voltage ELVDD and low voltage ELVSS, then the organic light emitting display can operate in standard display mode, but the quiescent current consumption increases significantly in low power display mode
Solution Approach 1:
The power supply system is segmented into two distinct power supplies: a first power supply (direct current generator) that provides high voltage ELVDD and low voltage ELVSS for standard display mode, and a second power supply that provides adjusted high and low voltages for low power display mode. This segmentation allows each power supply to be optimized for its specific operating mode, enabling the system to reduce quiescent current consumption in low power mode by switching off or reducing the output of the first power supply while maintaining necessary voltage levels through the second power supply.
2Use of energy by moving object
If a charge pump is added to the driver integrated circuit to generate high and low voltages, then low power display mode can be achieved, but the device complexity increases
Solution Approach 1:
The second power supply is designed to provide multiple functions: it can operate independently to provide both high and low voltages for low power display mode, and it can also work in conjunction with the first power supply for standard display mode. By making the second power supply multi-functional, the patent avoids the need for a separate charge pump circuit, thereby reducing device complexity while still achieving low power consumption in low power display mode.
Data Source
AI summary
An organic light emitting display and power supply method thereof operate an organic light emitting display panel using a high voltage EVLDD and a low voltage ELVSS supplied from a driver integrated circuit during a low power display mode. The organic light emitting display a first power supply configured to supply a first power including a first high voltage and a first low voltage, a second power supply configured to supply a second power including a second high voltage and a second low voltage, and an organic light emitting display panel configured to receive the first power from the first power supply in a standard display mode and configured to receive the second power from the second power supply in a low power display mode.