Dynamic Voltage Control for AMOLED Power Efficiency
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Solution Overview
Problem
Active matrix organic light emitting device (AMOLED) displays face challenges in power consumption due to fixed voltage supply, leading to inefficient power usage and increased heat generation, which affects display performance and longevity.
Innovation Solution
A system with an adjustable voltage supply that dynamically adjusts the supply voltage based on digital data indicative of luminance, allowing for reduced power consumption by optimizing the voltage difference across pixels, thereby minimizing power drawn and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed voltage supply is used in AMOLED displays, then the display can operate with simple power supply circuitry, but power consumption increases and heat generation occurs
Solution Approach 1:
The patent implements dynamic voltage supply by adjusting the voltage level provided to pixel circuits based on the luminance values of displayed images. The voltage supply transitions from a fixed state to a dynamic state where voltage levels are continuously adjusted according to display content requirements, thereby reducing power consumption while maintaining display performance
Solution Approach 2:
The patent changes the voltage parameter supplied to pixel circuits based on luminance data. By varying the voltage level according to the brightness requirements of different display regions, the system optimizes power consumption without compromising image quality, directly addressing the contradiction between simple circuitry and energy efficiency
2Device complexity
If a fixed voltage supply is used in AMOLED displays, then the power supply system remains simple, but heat generation increases affecting display performance
Solution Approach 1:
The dynamic voltage adjustment mechanism allows the power supply system to adapt voltage levels in real-time based on display content. This dynamic behavior reduces unnecessary power dissipation and heat generation while maintaining the simplicity of the overall power supply architecture
Solution Approach 2:
The patent converts the potentially harmful effect of fixed voltage-induced heat generation into a beneficial outcome by using luminance information to dynamically adjust voltage levels. This transforms what would be waste energy into useful, targeted power delivery that reduces heat generation while maintaining display performance
3Ease of operation
If voltage is continuously supplied to all pixel circuits, then all pixels can be driven, but power consumption increases during idle periods
Solution Approach 1:
The patent segments the display into different regions with different luminance characteristics and supplies voltage selectively to these segments based on their actual display requirements. During idle periods, only necessary segments receive voltage supply, reducing overall power consumption while maintaining the ability to drive all pixels when needed
Solution Approach 2:
The patent applies partial voltage supply to pixel circuits based on actual display needs rather than continuous full-voltage supply to all pixels. By providing voltage only where and when needed, the system reduces power consumption during idle periods while maintaining full operational capability when required
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 solution significantly reduces power consumption and heat generation in AMOLED displays, enhancing their efficiency and extending their operational lifespan while maintaining luminance levels.
Implementation Method 1
The OLEDs emit light based on current supplied through a drive transistor
Implementation Method 2
The power consumed in each pixel at any instant is related to the current through the pixel and the voltage across the pixel
Data Source
AI summary
Methods and systems to dynamically adjust a voltage supply of a display are provided. Systems are provided to receive a digital data input indicative of an amount of luminance to be emitted from the display, to determine a desired supply voltage to supply to the display based on the received digital data, and to adjust an adjustable voltage supply according to the determined desired supply voltage. Furthermore, the methods and systems disclosed herein provide for dynamically separately controlling supply voltages supplied to distinct subsections of the display. Systems and methods are also provided for operating a display device in an idle mode by turning off subsections of the display that would otherwise be shown dark and thereby save energy required to program the subsections with display information.