AMOLED Display Dynamic Voltage Control for Power Reduction
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Solution Overview
Problem
Active matrix organic light emitting device (AMOLED) displays face challenges in power consumption due to fixed supply voltage levels, which can lead to increased power usage and heat generation, especially when displaying varying luminance levels.
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 supply lines, thereby minimizing power required to drive pixels and reducing heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed supply voltage levels are used in AMOLED displays, then the display can maintain stable operation, but power consumption increases and heat generation occurs
Solution Approach 1:
The patent implements dynamic voltage adjustment by making the supply voltage variable rather than fixed. The controller dynamically changes the supply voltage level based on the luminance requirements of different display content, allowing the display to adapt its power consumption to actual needs while maintaining stable operation through controlled voltage transitions
Solution Approach 2:
The patent changes the voltage parameter from a fixed value to a variable value that adapts to different operating conditions. By adjusting the supply voltage parameter according to luminance requirements, the system achieves both stable operation and reduced power consumption when high luminance is not needed
2Reliability
If fixed supply voltage levels are used in AMOLED displays, then the display can maintain stable operation, but heat generation increases
Solution Approach 1:
The dynamic voltage adjustment mechanism allows the display to reduce heat generation by lowering supply voltage when full brightness is not required. This dynamic adaptation prevents excessive heat buildup while maintaining stable operation through controlled voltage levels
Solution Approach 2:
By changing the voltage parameter dynamically, the system reduces heat generation that occurs with fixed high voltage. The voltage parameter is adjusted to match actual luminance needs, preventing unnecessary thermal energy dissipation while maintaining operational stability
3Illumination intensity
If higher supply voltage is applied to increase luminance, then brightness is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts voltage based on actual luminance requirements rather than always applying high voltage. This allows the display to achieve necessary brightness levels while consuming less power by using higher voltage only when and where needed
Solution Approach 2:
The patent applies different voltage levels to different regions or time periods based on luminance needs. By making voltage quality variable rather than uniformly high, the system achieves required brightness while reducing overall power consumption
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 system effectively decreases power consumption and heat generation by dynamically adjusting supply voltages, ensuring sufficient luminance while minimizing power usage and extending the lifespan of the display panel.
Implementation Method 1
The OLEDs emit light based on current supplied through a drive transistor
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.