Adaptive Voltage Control for OLED Display Power and Image Quality
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Solution Overview
Problem
In digital driving methods of organic light emitting display devices, power consumption increases and image quality decreases due to current-resistance drops and temperature variations, which are not effectively addressed by existing technologies.
Innovation Solution
A method of adaptive voltage control is implemented by dividing input image data into sub-image data blocks, calculating sub-loads, and adjusting high and low data voltages based on average grayscales and asymmetry, using a voltage control signal to optimize voltage levels and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If digital driving method is used to simplify pixel structure, then device complexity is reduced, but power consumption increases due to IR drop and temperature variation
Solution Approach 1:
The display panel is divided into multiple blocks, and voltage compensation is performed separately for each block based on its specific load characteristics. This allows targeted voltage adjustment without affecting the entire panel, enabling simplified digital driving architecture while compensating for IR drop and temperature effects locally.
Solution Approach 2:
The patent dynamically adjusts data voltages based on calculated load values and IR drop compensation parameters. By changing voltage parameters adaptively according to actual operating conditions (load, temperature, position), the system maintains efficient operation without requiring complex pixel structures.
2Device complexity
If constant data voltage is supplied in digital driving, then pixel structure is simplified, but image quality deteriorates due to IR drop and temperature variation
Solution Approach 1:
The system calculates load values and determines compensation voltages in advance before actual pixel driving. By pre-computing the necessary voltage adjustments based on image data analysis and block load characteristics, the patent compensates for IR drop and temperature effects before they manifest as image quality issues, while maintaining simple digital pixel structures.
Solution Approach 2:
The patent introduces an intermediate voltage compensation mechanism that acts between the data source and the pixel array. This intermediary system calculates and applies block-specific voltage adjustments, serving as a mediator that corrects IR drop and temperature variations without requiring complex modifications to the pixel structures themselves.
3Use of energy by moving object
If voltage compensation is applied to reduce power consumption, then energy efficiency improves, but device complexity increases
Solution Approach 1:
The voltage control system is segmented into block-specific controllers that operate independently. Each block receives customized voltage compensation based on its load characteristics, allowing efficient power management without requiring a monolithic complex control system. This modular approach distributes the control complexity across multiple simple block controllers.
Solution Approach 2:
The patent applies voltage compensation selectively to specific blocks that require it, rather than uniformly across the entire display panel. By identifying and compensating only for blocks with significant IR drop or temperature effects, the system achieves power savings without implementing full complexity throughout the entire device.
Data Source
AI summary
A method of driving a display device includes calculating an average load and an asymmetry by analyzing an input image data, and adjusting at least one of a high data voltage and a low data voltage, which are supplied to a display panel of the display device, based on the average load and the asymmetry.