Sunday, January 31, 2016

ESP8266 Transmits Television on Channel 3 | Hackaday

Sent from my iPad

Saturday, January 09, 2016

This is the Darkest Material Known to Man

This is the Darkest Material Known to Man

Vantablack is a material that is so dark, our eyes can’t see any of its contours.

Thursday, January 07, 2016

Focus tunable lenses

Optotune’s focus tunable lenses are shape-changing lenses based on a combination of optical fluids and a polymer membrane. The core element consists of a container, which is filled with an optical liquid and sealed off with a thin, elastic polymer membrane. A circular ring that pushes onto the center of the membrane shapes the tunable lens. The deflection of the membrane and with that the radius of the lens can be changed by pushing the ring towards the membrane or by exerting a pressure to the outer part of the membrane or by pumping liquid into or out of the container.
Working principle of ML lenses 
Working principle of Optotune’s manual lens ML-20-35, which achieves a lens shape ranging from concave to flat to convex. The ring that forms the lens is pushed towards the container, thus filling the lens with liquid

Optotune uses electroactive polymers (EAPs) as an electrostatic actuator for its series of laser speckle reducers. These so-called "artificial muscles" can undergo a large amount of deformation while sustaining large forces. While today's piezoelectric actuators only deform by a fraction of a percent, EAPs can exhibit a strain of up to 380%. There are different types of EAPs. Optotune has specialized in dielectric electroactive polymers (DEAPs) as described below. A detailed discussion on all types of EAPs can be found here.

Monday, December 21, 2015

Matte vs Glossy Monitors

Matte vs Glossy Monitors

Great discussion of Screen Surfaces and optical coatings.

Sunday, December 20, 2015

The Electrowetting Display

Electrowetting displays are just as capable as the liquid crystal displays in tablets and notebooks, but they are three times more efficient. Johan Feenstra, who heads Samsung's electronic display research center in the Netherlands, explains how they work.

Bright, full color e paper under development by Ricoh

This e-paper is currently under development by Ricoh.

It has a unique structure, with layers of a new electrochromic material that turn magenta, yellow, and cyan from their transparent state. In this way, Ricoh's e-paper enables a bright, full-color display, like ordinary paper, which hasn't been possible with e-paper until now.

This prototype is a 3.5-inch, QVGA display, with a pixel density of 113.6 ppi. Its reflectivity is 70%. Compared with current color-filter displays, this e-paper is 2.5 times brighter. It has a color reproduction range of 35%, higher than that of a newspaper, which is 31% in Japan.

"To produce colors, CMY subtractive mixing is ideal, and that's the model used in printing. We've implemented this by coating the panel with layers of yellow, magenta, and cyan. Ordinarily, if you try to use layers like this, you need an electrode driver for each layer. But in this display we're developing, the electrodes are active TFTs. So, we can achieve all colors with a single TFT, by switching the electrodes on the display side."

The material used for the chromic layers is transparent in its oxidized state, but becomes colored when it's reduced. To achieve a color display, rewriting is done three times in the order magenta, yellow, cyan. As the spaces between the electrochromic layers are narrow, at about 2 microns, the result is an ideal color-mixing display.

"The stage we're at right now is, we're checking that this model works with an actual active panel. Regarding the color drive, we haven't refined this yet, so switching takes over a second for each color. But the reaction speed of the chromic material is, ideally, about 100 ms."

"From now on, we'd like to increase the size to 6 inches, then 10 inches. We also want to work on achieving stable driving and faster response."

Saturday, November 14, 2015



Brion Vibber has been working on ogv.js, an Ogg video player in JavaScript, supporting both audio and video. We've seen video codecs in JavaScript before, such as Broadway (H.264),Route9 (WebM/VP8), and more but mostly without audio support to go along with it. We have audio codecs in JS too, just not combined with video yet. That changes with ogv.js.