OLED Subpixel Variable Power Supply for Voltage Matching
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Solution Overview
Problem
Current OLED displays waste power due to using the same driving voltage for red, green, and blue subpixels, despite their different electro-optical characteristics, leading to inefficient power usage.
Innovation Solution
Implementing a variable power supply system where red subpixels are driven by an independently adjustable voltage, and green and blue subpixels by a separate, independently adjustable voltage, based on their respective voltage-to-current characteristic curves, to optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the same power supply voltage is applied to red, green, and blue subpixels, then the circuit design is simple and easy to manufacture, but power consumption increases due to voltage wastage on low-voltage OLEDs
Solution Approach 1:
The patent segments the power supply system into multiple independent voltage sources (first power supply voltage for red subpixels, second power supply voltage for green subpixels, third power supply voltage for blue subpixels). Each voltage source is independently controllable and optimized for its corresponding OLED type, allowing voltage matching to minimize power wastage while maintaining manageable circuit complexity through modular design
Solution Approach 2:
The patent applies different voltage levels to different subpixel groups based on their specific electro-optical characteristics. Red subpixels receive a first voltage optimized for their lower operating requirements, while green and blue subpixels receive higher voltages matched to their characteristics. This local optimization ensures each subpixel operates at its optimal voltage point, reducing overall power consumption
2Adaptability or versatility
If higher power supply voltage is used to accommodate all subpixels, then all subpixels can be driven with the same voltage, but power wastage occurs on low-voltage OLEDs
Solution Approach 1:
The power supply is segmented into multiple independent voltage sources, each optimized for specific OLED types. This allows red subpixels to operate at their optimal lower voltage while green and blue subpixels operate at their required higher voltages, eliminating the need to over-voltage all subpixels and thereby reducing power wastage
Solution Approach 2:
The patent changes the voltage parameter for different subpixel groups based on their electro-optical characteristics. By adjusting the power supply voltage to match each OLED type's requirements (lower voltage for red, higher voltage for green and blue), the system achieves optimal power efficiency while maintaining compatibility across all subpixels
3Loss of energy
If separately controllable voltage power supplies are implemented for different subpixels, then power consumption is reduced through optimized voltage matching, but device complexity increases
Solution Approach 1:
The power supply system is segmented into multiple independent but coordinated voltage sources. Each voltage source is independently controllable and optimized for its corresponding OLED type, allowing voltage matching to minimize power wastage while the modular segmented architecture keeps the overall system complexity manageable
Solution Approach 2:
The power supply unit is designed with multi-functionality, capable of independently controlling multiple voltage levels for different subpixel groups. This universal power supply design reduces the need for separate dedicated power circuits for each subpixel type, thereby reducing overall device complexity while maintaining the benefits of separate voltage control
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
This approach reduces power consumption by ensuring each subpixel operates at the optimal voltage, minimizing unnecessary power wastage and improving overall display efficiency.
Implementation Method 1
a photons emitting layer (EML) disposed between a cathode electrode and an anode electrode
Data Source
AI summary
An organic light emitting diodes (OLED's) display has differently composed OLED's with respective different voltage-to-current characteristic curves. Variable power voltages are applied to the subpixels of these differently composed OLED's based on their respective voltage-to-current characteristic curves. In one embodiment, a display unit includes first subpixels emitting respective lights according to first image data representing a first color, second subpixels emitting respective lights according to second image data representing a second color, and third subpixels emitting respective lights according to third image data representing a third color, wherein the first, and second subpixels are powered by a first variable voltage power supply and the third subpixels are powered by a second and independently variable voltage power supply.