Organic Electro-luminescence Display Power Management
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Solution Overview
Problem
Organic electro-luminescence displays consume high power when partially driven or in standby mode due to the inefficiency of switching regulators and continuous voltage supply to pixels, even when displaying black, which reduces battery life in portable devices.
Innovation Solution
The implementation of a dual-regulator system and a switching unit that generates and transmits lower power voltages to the pixel unit only when necessary, along with a power generating unit that generates multiple voltages for the driver unit, allowing the display to reduce power consumption by ceasing to generate high power voltages during partial driving or standby modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a switching regulator is used to generate power voltages in an organic electro-luminescence display, then the display can operate with high brightness and emission efficiency, but the power consumption increases significantly during partial driving and standby modes due to regulator inefficiency
Solution Approach 1:
The patent implements dynamic power voltage generation by switching between two different power supply paths: a switching regulator for high brightness modes and a simple voltage divider circuit for partial driving and standby modes. This dynamic adaptation allows the system to optimize power consumption based on the actual display requirements, avoiding the high power consumption of the switching regulator when full brightness is not needed.
Solution Approach 2:
The patent changes the power supply parameters by introducing a dual power supply architecture where the first power supply (switching regulator) operates at high voltage for full display modes, while the second power supply (voltage divider) provides lower voltages for partial driving and standby modes. This parameter change enables significant power reduction during low-activity states while maintaining performance during high-activity states.
2Speed
If continuous power voltage is supplied to all pixels to maintain display readiness, then the display can respond quickly to any pixel activation, but the power consumption remains high even when only portions of the display are actively used
Solution Approach 1:
The patent segments the power supply system into two independent paths: a first power supply for full-power operation and a second power supply for reduced-power operation. Additionally, the display area is segmented into active and inactive regions, with only the necessary pixels receiving full power voltage during partial driving modes. This segmentation allows the system to maintain response readiness for active pixels while reducing or eliminating power supply to inactive pixels.
Solution Approach 2:
The patent applies partial action by providing full power voltage only to the portions of the display that are actively being used, rather than supplying power to all pixels uniformly. During standby and partial driving modes, the second power supply provides reduced voltage or no voltage to pixels that are not currently in use, thereby reducing overall power consumption while maintaining the capability to quickly activate pixels when needed.
3Measurement precision
If multiple power voltages are generated and supplied to pixels for gray scale display, then the display achieves high image quality and contrast, but the complexity of the power management system increases
Solution Approach 1:
The patent implements multi-functionality by designing the dual power supply system to serve multiple purposes: the first power supply handles high-current demands during full display operation, while the second power supply handles low-current demands during partial driving and standby modes. This universal design allows a single power management architecture to efficiently handle all operating conditions without requiring completely separate power systems for each mode.
Data Source
AI summary
An organic electro-luminescence display is disclosed. The display includes a pixel unit configured to display at least a portion of an image, a first regulator configured to generate first and second power voltages and to transmit the first and second power voltages to the pixel power source line, a second regulator configured to generate a predetermined voltage and to transmit the predetermined voltage to a driver driving unit, and a power generating unit. The power generating unit is configured to generate another predetermined voltage, to transmit the other predetermined voltage to the signal generator, to generate a third power voltage, to transmit the third power voltage to the pixel unit, and to generate a fourth power voltage. The display also includes a switching unit configured to transmit the third and fourth power voltages to the pixel power source line when the first and second power voltages are off.