Dransk University has introduced a display that can change the shape of its surface very quickly. I can help with difficult operations and the blind in everyday life.
He then had a plate (4 x 5.5 cm) with a density of 297 dots per centimeter hard to change its surface beyond recognition within a few hundred milliseconds. This allows tactile perception of doctors during operations or black reading, where they use robots and miniature cameras. The inventors secretly use the display as an aid for the blind.
In recent years, many companies have tried to reduce the size of the display, but the projects have not been able to overcome the various rocks or have not been able to continue due to a lack of pensions. The display presented by Dr. Andreas Richter and George Paschew from the Technical University of Drany is perceived in several respects.
On the one hand, there is a functional specimen in the world, and not just an idea; then it is so finely spilled and so far it can be transformed very quickly. The pattern on the surface is created in pl seconds.
How does it work
The display is composed of those thousands of small drops of hydrogel, which form individual pixels. Hydrogel is a precious material from which, for example, contact eyelets are made.
Scientists drank that some mixtures of hydrogels can respond to various stimuli and change their properties. The type of hydrogel used “dries out” during heating, ie the loss of water content and thus the volume. At temperatures up to 29 ° C it is relatively stable, at a temperature of 35 ° C loss and 90% by volume. If you stop warming it, it quickly absorbs water from the bottom layer and increases again. The bottom layer is actively cooled with water so that it does not start to heat up over time.
According to vdc, the points not only change after hardening, but also harden due to water loss. Bn is a hydrogel very soft and pliable material, so the contours must be displayed to the touch, especially as a tool for blind eyes.
The dot on the display is relatively small, only 0.5 mm. Minimum point height after 0.28 mm. If you (and more voluminous) the points would be, the longer it would take them to load, the display would not be able to change so quickly. As a result, the surgeon perceives the tactile sensation together with the visual image from the cameras, the blind, relying only on the tactile, needs a bag of large shapes not high resolution.
“It is finely spaced for the blind to make the tactile impression pleasant. However, the stated maximum point height of 0.5 mm is, in my opinion, insufficient, ”for the blind Patrik Pospil, the development of a special communication program for the blind designed for smartphones with the Windows Mobile operating system.
The height of only half a millimeter is very limiting. If a large enough pattern is not available to the blind, the high resolution of an otherwise small display is over. On the other hand, the doctor can display a high-resolution throw, or even when reading, even small details can be displayed.
“Such a display could show you the relief of a car, a house, a new mobile phone, a map drawing, but in such a case it would be very appropriate for its size to be comparable to the size of standard monitors. I would see this technology as an alternative to a braille display that uses piezoelectric elements. The maximum point height will have to be in t, ”adds Pospil.
How does the display turn on?
The display needs a beam of light accurate enough to find a 300 x 300 micrometer dot. However, they used a halogen scale with precise optics from a standard projector for this purpose. Operate it in such a way that the beam overdraws the individual pixels and, with the power of the equation, reflects each drop of hydrogel separately. The advantage is that it works, the disadvantage is the high consumption of system cells.
For the following example of a dolphin with given times, a power of 4 W per cm is required2what others got from a projector with a xenon plane with a power of 3,000 W and a luminous flux of 20,000 lumens. The press first states that a similar performance can be achieved with a projector with a halogen equation of 1,200 W / 27,600 lumens. For such a small plate, it’s like a jt with a cannon on a sparrow.
The sign from the thermal camera shows how the pixel of the hydrogel rotates with respect to time. Obrzek d) After 40 milliseconds from the plug, the pixels to be formed into a dolphin shape are projected to a temperature of about 30 ° C. Therefore, they should travel a maximum height of about 500 micrometers (0.5 mm); Sword e) after 200 milliseconds, the points swelled to 33 ° C. At this point, the hydrogel changes and the dolphin is clear when looking at the display; Obrzek f) after 400 milliseconds, the contour is practically complete. The temperature approached 34 ° C and the height of the heated pixels was limited to 280 micrometers; Ring g) the temperature reaches 35 ° C after 65 seconds. In this figure, the display shows the maximum when the point of the closed point is at 280 micrometers. Delfn m total length 1.45 cm.
While it should not be a problem to ensure a stable temperature and energy source in a busy workplace, the use of displays in smaller traffic lights seems to be limited. But Dr. Andreas Richter mentions in an e-mail that it’s just a trifle. “Optoelectrothermal heat can easily be replaced by a thin layer of small heat sources for portable devices.” It is not clear which response the subsequent display should have and how it would result in consumption.
Would there be any interest among the blind in the blind, which should display first with the possibility of plastic display? “For PDAs and mobile phones, this is happening according to my accidents, because with the touch of a millimeter, only 0.5 mm of feathers rose, not enough time,” explains Patrik Pospil.
“Perhaps you would be interested in the curve of the route from GPS, but I still do not consider it meaningful in the design of the display with a depth below 4 ″ (10 cm). If it were displayed in this way on a mobile, tactile display, Braille, even then it would not be intelligible to most blind people with a point height of 0.5 mm. Regardless of the fact that there should be very little text displayed on this screen, ”adds the programmer Pospil.
Another pirovnvaj feeling from touching the screen to shave on the snail (hydrogel is moist) and ki snake (which can be gently clamped). If the “hlemdho” display is ever used, for example, in a mobile phone for the blind, then it remains in the stars. It is definitely one of the most interesting projects of recent times.
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