TurboLED® is a novel technology to reduce display power consumption and enable displays to be more colorful, brighter and true-to-life. TurboLED® has the potential to reduce display power consumption by up to 50% to extend the daily battery life of portable devices, such as smartphones, tablets and laptops by several hours each day. TurboLED® also provides a path to create the World’s most colorful displays.
The images on the right compares the design of a standard pixel used in state-of-the-art smartphone displays with the novel TurboLED pixel design.
In the standard pixel design, only deep color emitters are used – and these inefficient deep red, green and blue sub-pixels are used for all image pixels, regardless of the content of the image.
In the TurboLED design, the efficient light red, green, and blue sub-pixels are used for most image pixels, while the inefficient deep red, green and blue pixels are only used when needed. This dramatically reduces the power consumption of the display.
Note that the TurboLED design supports two architectures. A side-by-side placement of sub-pixels, or a stacked one.
Side-by-side is straightforward to implement, and maintains most of the benefits of TurboLED (but loses half the resolution density), while a stacked architecture requires changes to the backplane but delivers a dramatic performance boost.
The images below show the photopic response of the human eye. It can be seen that human eyes are far less sensitive to deeper colors than lighter colors, and in fact when reds and blues become too deep in color, we cannot see them at all. For this reason, it takes more power for displays to render deeper colors than lighter colors. This is depicted for deep and light red, green and blue, where in each case the sensitivity of the human eye is higher for the lighter color than for the deeper color.
However, the vast majority of pixels in a display image do not contain deep colors. Look around you. How many deep red, green and blue colors do you see? Studies show that approximately 90% of the pixels in an average display image, do not contain any deep red, or green colors at all.
The power savings from the novel TurboLED display design can be reinvested in the display, and the display can be made brighter or the deep colors can be made deeper. This is shown in the color gamut image. The deep colors show the Rec. 2020 color gamut depicted in the CIE 1931 (x, y) chromaticity diagram. TurboLED can enable displays to render the Rec. 2020 color gamut.
The video shows a prototype TurboLED pixel that demonstrates the concept in a larger device. The pixel alternates between light green and deep green. In a display, the light green would be used for the majority of pixel images, while the deep green would only be used where needed.