All the components used in any wearable device or gadget must have a long life span and this is why components with shorter life spans that might require frequent replacements are usually avoided as much as possible. By extension therefore, these new dotLEDs will have to come with serious clout in the forms of long life spans before they can be taken seriously as the main illuminating components within the design of wearable technology.
When it comes to the design of wearable technology, one of the main concerns is usually how to ensure that the device or gadget stays powered up for as long as possible. A direct interpretation of this is that the designers have to ensure that all the components that they use consume the least power possible. And so comes the real question; how much power do these new dotLEDs consume?
You want small? Here is Toshiba announcing new 0.65mm x 0.65mm die at 5000K, with CCTs down to 2700K under development. Mid-power at 1/4 to 1/2 Watt and luminous efficacy of 130 lm/W claimed at 5000K, 80 CRI. They are manufactured on 8" silicon wafers in the process Toshiba licensed, then bought, from Bridgelux.
The comments on my article at All LED Lighting brought out some, er, interesting aspects I hadn't picked up from the data sheets. Plessey doesn't list a CCT for its 1005 parts. It seems they range from 8000K to 19,000K. There is one heck of a lot of blue coming out of those LEDs.
Toshiba's announcement seems a lot more "real." Also impressively smaller. We could fit over 300 of them on our pinhead.
That's a small LED! You don't see the 01005 package used much for other than hearing aids or really specialized applications. I have a feeling, we'll be seeing more and more devices of this size being used in the very near future.
Replay available now: A handful of emerging network technologies are competing to be the preferred wide-area connection for the Internet of Things. All claim lower costs and power use than cellular but none have wide deployment yet. Listen in as proponents of leading contenders make their case to be the metro or national IoT network of the future. Rick Merritt, EE Times Silicon Valley Bureau Chief, moderators this discussion. Join in and ask his guests questions.