RGBW OLED Display Voltage Control Power Efficiency
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Solution Overview
Problem
Active matrix OLED displays face inefficiencies in power consumption due to excessive voltage drop across power transistors when pixels operate at lower intensity, leading to poor power efficiency and reduced device lifetime.
Innovation Solution
The implementation of an RGBW OLED display design with a within-gamut pixel and gamut-defining pixels, where the within-gamut pixel is more efficient than the gamut-defining pixels, allowing for reduced peak current and voltage requirements, thereby improving power efficiency and extending device lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single voltage level is used to drive all pixels at maximum intensity, then all pixels can operate at full brightness, but power consumption increases and power efficiency deteriorates when pixels operate at lower intensity
Solution Approach 1:
The patent implements dynamic voltage control by providing at least two different voltage levels to different colored pixels, allowing the display to adapt voltage supply to the specific requirements of each pixel rather than using a fixed maximum voltage for all pixels at all times
Solution Approach 2:
The patent changes the voltage parameter by providing different voltage levels (at least two different voltage levels) to different colored pixels based on their specific electrical characteristics and efficiency requirements, optimizing power consumption for each pixel type
2Measurement precision
If voltage is set to drive gamut-defining pixels at maximum intensity, then color accuracy is maintained, but power consumption increases due to higher voltage requirements
Solution Approach 1:
The patent applies different voltage levels to different colored pixels based on their specific characteristics - gamut-defining pixels receive higher voltage to maintain color accuracy, while within-gamut pixels receive lower voltage since they don't require the same color precision
Solution Approach 2:
The patent changes the voltage parameter to match the specific needs of each pixel type, providing higher voltage only where necessary for color accuracy (gamut-defining pixels) and lower voltage where color precision is less critical (within-gamut pixels)
3Illumination intensity
If peak current is increased to maintain luminance, then brightness is sufficient, but device lifetime decreases due to higher stress on components
Solution Approach 1:
The patent changes the current parameter by providing different current levels to different pixel types - lower peak current to within-gamut pixels extends device lifetime while sufficient luminance is maintained through optimized voltage application and pixel configuration
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 results in lower current requirements, reduced overall power consumption, and decreased voltage needs, enhancing the power efficiency and longevity of the OLED display while maintaining color accuracy and luminance.
Implementation Method 1
The organic electroluminescent media supports recombination of holes and electrons that yields emission of light
Data Source
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AI summary
An OLED display for producing a full color image, comprising a plurality of at least four different colored pixels including three different colored addressable gamut-defining pixels and a fourth addressable within-gamut pixel, each pixel having an organic light-emitting diode with first and second electrodes and one or more organic light-emitting layers provided between the electrodes; the OLED display having a selected display white point, display peak luminance, gamut-defining pixel peak luminances and within-gamut pixel peak luminance; and drive circuitry for regulating luminance of the organic light-emitting diode of each of the colored pixels wherein the sum of the gamut-defining pixel peak luminances is less than the display peak luminance.