editor's blog
Subscribe Now

Your Wall As a Touchscreen

Pico-projectors sound like an absolute dream for anyone who has to travel with a standard projector in tow. Being able to attach a small device to your phone has the potential to eliminate one heavy bag and to give your shoulder a badly-needed rest. In reality, of course, they don’t have the power that a “real” projector has, so you’re not going to thrill an audience in a big room using your phone. But when the need arises, they can allow for ad hoc display of anything on a modest patch of wall.

Microvision is in this business; they make a pico-projector that uses a single laser for each color and a movable mirror to create a workable image for a small presentation or a heads-up display.

Much of their future work will focus on the same thing everyone else is focusing on: reducing power. Right now they do that by blanking any lasers that aren’t in use at a given instant; future gains will be had by improved green and blue LED efficiency, working an efficient modulation scheme, and taking advantage of Moore’s Law improvements in the digital controller. All to get under 1 W. I know; sounds high, but this thing is all about projecting enough light to overcome the ambient. Ever wonder how much power those monster projectors in auditoriums suck down? Lots, judging by the cooling units… And that’s for use in a darkened room…

But power reduction is an evolutionary improvement. This year they’re looking to change the game by measuring reflections when the scanning laser beam is blocked by something like a finger. Since the system knows where it was shooting the beam when the unusual reflection occurred, it can provide coordinates for the obstruction. In other words, if you point, the system can figure out what you’re pointing to.

This really changes the nature of the presentation from simply a passive transmission of visual images to a – must I use the phrase? – collaborative engagement. The idea is to turn the wall where this is being projected into a temporary tablet on the scale of 2-3’ (5-8’ in a darkened room).

I’m assuming that this isn’t trivial to do. The background against which these “reflective anomalies” (I made the phrase up for lack of a better one) are detected isn’t predictable. One day the projector might be in a bright room shining on a yellow wall; another day, another café, perhaps darker, with a light blue wall. So they will presumably need to normalize the current environment as a calibration step so that they can figure out when a reflection is anomalous.

 But this seems typical of a lot of the work being done in the realm of smart systems: extract useful signals out of extraordinarily noisy environments. We actually seem to be getting pretty good at it.

This capability isn’t available yet, but they said to watch for it in 2014. And watch we will.

Leave a Reply

featured blogs
Nov 23, 2022
The current challenge in custom/mixed-signal design is to have a fast and silicon-accurate methodology. In this blog series, we are exploring the Custom IC Design Flow and Methodology stages. This methodology directly addresses the primary challenge of predictability in creat...
Nov 22, 2022
Learn how analog and mixed-signal (AMS) verification technology, which we developed as part of DARPA's POSH and ERI programs, emulates analog designs. The post What's Driving the World's First Analog and Mixed-Signal Emulation Technology? appeared first on From Silicon To So...
Nov 21, 2022
By Hossam Sarhan With the growing complexity of system-on-chip designs and technology scaling, multiple power domains are needed to optimize… ...
Nov 18, 2022
This bodacious beauty is better equipped than my car, with 360-degree collision avoidance sensors, party lights, and a backup camera, to name but a few....

featured video

Maximizing Power Savings During Chip Implementation with Dynamic Refresh of Vectors

Sponsored by Synopsys

Drive power optimization with actual workloads and continually refresh vectors at each step of chip implementation for maximum power savings.

Learn more about Energy-Efficient SoC Solutions

featured paper

How SHP in plastic packaging addresses 3 key space application design challenges

Sponsored by Texas Instruments

TI’s SHP space-qualification level provides higher thermal efficiency, a smaller footprint and increased bandwidth compared to traditional ceramic packaging. The common package and pinout between the industrial- and space-grade versions enable you to get the newest technologies into your space hardware designs as soon as the commercial-grade device is sampling, because all prototyping work on the commercial product translates directly to a drop-in space-qualified SHP product.

Click to read more

featured chalk talk

Traction Inverter

Sponsored by Infineon

Not only are traction inverters integral parts of an electric drive train and vital to the vehicle motion, but they can also make a big difference when it comes to the energy efficiency and functional safety of electric vehicles. In this episode of Chalk Talk, Amelia Dalton chats with Mathew Anil from Infineon about the variety of roles that traction inverters play battery electric vehicles, how silicon carbide technology in traction inverters can reduce the size of electric car batteries and how traction inverters can also help with cost reduction, functional safety and more.

Click here for more information about Automotive IGBT & CoolSiC™ MOSFET Modules