Four-Pixel LED Display Gamut Expansion With Lower Power Use
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Solution Overview
Problem
Existing LED systems face challenges in achieving a large color gamut while maintaining high power efficiency, particularly in mobile device applications where energy efficiency is crucial.
Innovation Solution
Incorporating a fourth pixel with higher luminous efficacy than either the red or blue pixels in an LED system, which allows for a larger gamut while enhancing power efficiency by reducing the power required for color synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a traditional RGB (red-green-blue) pixel system is used to achieve a standard color gamut, then the device structure remains simple and easy to manufacture, but power efficiency is insufficient and energy consumption is high
Solution Approach 1:
The pixel system is segmented into four distinct color channels (red, green, blue, and yellow) instead of the traditional three. Each color channel is independently controllable, allowing the system to select the most energy-efficient combination of pixels for displaying different colors, thereby improving overall power efficiency
Solution Approach 2:
The patent combines traditional RGB LED materials with additional yellow LED materials to create a composite pixel system. This composite approach enables the system to leverage the high energy efficiency of yellow LEDs while maintaining the color synthesis capabilities of the traditional RGB system
2Loss of energy
If red and blue pixels with lower luminous efficacy are used to achieve accurate color synthesis in RGB displays, then color accuracy is maintained, but power consumption increases
Solution Approach 1:
The patent changes the spectral parameters of the pixel system by introducing yellow LEDs with dominant wavelengths around 570-580nm and high luminous efficacy. This parameter change allows the system to replace less efficient red and blue LEDs in certain color synthesis scenarios, reducing energy loss while maintaining color accuracy through adaptive pixel combination
3Use of energy by stationary object
If a fourth pixel with higher luminous efficacy is added to improve power efficiency, then energy consumption is reduced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The fourth yellow pixel is designed to serve multiple functions: it can replace red pixels in warm color synthesis, replace blue pixels in cool color synthesis, and work in combination with green pixels for various color outputs. This multi-functionality justifies the added manufacturing complexity by providing versatile color synthesis capabilities with improved energy efficiency
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 addition of a high-efficacy fourth pixel enables the LED system to achieve a larger color gamut while improving power efficiency, thereby addressing the conflicting requirements of color performance and energy consumption.
Implementation Method 1
Semiconductor light-emitting devices or optical power emitting devices (such as devices that emit ultraviolet (UV) or infrared (IR) optical power), including light emitting diodes
Implementation Method 2
a fourth set of pixels configured to emit a non-white emission comprising a luminous efficacy that is higher than either of the first set of pixels or the third set of pixels to increase power efficiency of the device
Data Source
AI summary
A light-emitting diode (LED) array comprises: a plurality of pixels, each of the pixels comprising respective groups of light emitting diodes (LEDs), the plurality of pixels comprising: a first set of pixels configured to emit a first red dominant wavelength; a second set of pixels configured to emit a first green dominant wavelength; a third set of pixels configured to emit a first blue dominant wavelength; the first red dominant wavelength, the first green dominant wavelength, and the first blue dominant wavelength defining a RGB (red-green-blue) gamut; and a fourth set of pixels configured to emit a non-white emission comprising a luminous efficacy that is higher than either of the first set of pixels or the third set of pixels to increase power efficiency of the device.