Rear Projection Screen, Rear Projection film, Rear projection foil, Transparent Rear projection film - DeFi TECH LTD / DeFi Interactive Projection LTD / Nanjing DeFi Software Technology Co., Ltd. / DeiF Tech CO., LTD . (DeFi for short) DEFI REAR PROJECTION FILM creates a high-definition image to allow viewing audience to experience a vivid image (see through) and an unreal image (look at) through the screen.
Projection film has high light transmittance and diffusion, making excellent color reappearance. It is very useful in displaying, advertisement for outdoor which makes your normal and colorless shop window into a dynamic and fantastic experience. Projection film also can be cut into any shapes as you like to make it alive and entertainment.Projection film makes your shopping window to be attractive among many competitors. Features: Any size can be customized easily High contrast gradient Easy installation Waterproof and durable. Build Your Own Multitouch Surface Computer - Page 2. The Lights The array of infrared LEDs is what floods the acrylic with light and creates the vital FTIR effect.
The exact construction of the array can differ greatly from one table to the next: which LEDs to use, how far apart to space them, how many sides of the screen to wire were all variables we had to consider. How to create a Zero-Force Compliant Surface for FTIR Based Multi-touch on a Back Projected Table. Materials needed for zero-force: SORTA-Clear 40 Silicone Rubber - North America / Germany Mylar - Available at any art store or craft store.
Also known as 'Sketching paper' or 'Architekt Papier' in Germany See here for a photo. Steps: Mix 908 grams (one tub of Silicone) + 90.8 grams (one bottle of Rubber) together for a 0.5mm surface on a 100cm by 75 cm table. Getting the Silicone Rubber even is non-trivial. There will be gaps. When it looks good, do the same thing in an orthogonal direction until you get a nice even glass like surface. Note, this step is the 'final' step in the pouring. Note, mixing the solutions introduces air bubbles. I cannot stress this anymore: do all of this fast. Let it dry for 24 hours at least. Note, I did not peal the Silicone Rubber off the surface. Voila. Put the Mylar on top. Put some Transparent Vinyl on top, plastic, or whatever, to protect the Mylar (if you want). Some comments: it feels fantastic. Oh, pens work too! That's all for now. DIY FTIR multi-touch display – Solution: compliant surface projection material › Nuiteq.
Since the beginning of the NUIgroup community, there has been a hunt to find a good piece of material to improve the coupling between the projection screen material (mylar, tracing paper, Rosco or other) and the acrylic.
With just the acrylic and the project screen on top, it was very hard to generate clear blobs. The blobs got pretty vague because of the diffusion of the infrared light by the projection screen material. In that case you had to press pretty hard to generate a workable blob. And that’s not something you want This has to do with physics. Members within the community have tried all different types of materials, rubbers, silicone, latex etc and it seems that thanks to trial and error and alot of input of different people, the hunt is over. Rockitdontstopit (NUIgroup community member) posted the image above into our Flickr multi-touch pool He used Transparent Silicone Rubber @ 0.5 mm with Mylar on Top. Where as Rosco is a relatively expansive material. Getting Started With MultiTouch. <div style="padding:15px; background-color:#FFA26F; border:1px solid #C3C3C3; padding-top:0px"> Getting Started With MultiTouch </div> Get the most recent information on -> multitouch getting started <div style="padding:15px; background-color:#FFA26F; border:1px solid #C3C3C3; padding-top:0px"> Multitouch Techniques </div> FTIR and DI are the two main technologies used in NUIGroup (Information on alternative techniques will be posted at a later time).
Specific Parts (brands, types, etc.) and techniques for completion can be found on the rest of the forum. <div style="padding:8px; background-color:#BFD6FF; border:1px solid #C3C3C3; padding-top:8px">Frustrated Total Internal Reflection (FTIR):</div> Infrared light is shined into the side of an acrylic panel (most often by shinning IR LEDs on the sides of the acrylic).
A silicone rubber layer is often used as a “compliant surface” to help improve dragging and sensitivity of the device. Diffused Illumination comes in two main forms. Ressources - Concevoir une surface multitouch / Usages des TIC, arts numériques et culture multimédia - Public Digital Art.