German Institute of research and development of smart phones dedicated micro LED projector

Researchers at Fraunhofer, a German research firm, said it had developed an array of hundreds of tiny projectors that would allow images of smartphones and other similar devices to be projected onto the IOF. The array can achieve ultra-thin LED projection system design, even on the curved screen, still can provide a bright image.

Smart phones to some extent, has replaced some of the desktop and pen features, but also began to use smart phones to display information. However, due to the limitations of the screen size, it is difficult to clearly show the smartphone image details. And now, through a LED based projector, as long as the smart phone on the coffee table will stand up, you can shoot a clear, bright A4 size image on the desktop. If the user wants to enlarge some of the image, as long as the touch screen to zoom in, the projected image will make the same response.

The special feature of the LED projector is that even in the reflective angle, with the use of the desktop is not smooth, it can still show very clear image. In general, this can lead to distorted and blurred images. German Fraunhof Applied Optics and Precision Engineering Research Institute is responsible for research and development of this projector (Fraunhofer Institute for Applied Optics and Precision Engineering IOF) technology has solved these problems, "our projector is composed of hundreds of tiny micro projector components in an array, each micro projector can produce a complete the image of" IOF scientist MarcEL Sieler said. "This technique is known as an array of projection technology, it is mainly imitation of a natural mechanism, such as some insect compound eyes, LED projection system and this is also the first time we can develop the ultra-thin, ultra bright, with powerful imaging performance. "

In the simplest application scenario, where the projector is placed vertically and projected onto the horizontal plane, these tiny projection opportunities project the same image onto the user's viewing surface. Hundreds of separate images will overlap and show the overall image sharp and bright. However, if the device is oriented towards a single screen, the image projected by each small projector will be slightly different. In order to project a sharp overall image, these individual images must also seek the most suitable projection angles and the geometric dimensions of the screen. This is due to the array of each projector in the overall scene perspective is slightly different. The greater depth of field of the micro lens means that there will be almost no screen size restrictions, or even the use of curved surface screen. Experts say this can be viewed as a focal point for the projector. Each of the independent images using the software operation, researchers have developed a special camera mobile phone positioning sensor and wisdom, the device can provide the geometric information necessary, let the software to calculate every single image, and the focus of the image set.

The optical device is fabricated using a wafer, comprising about 300 chips, each of which contains 200 lenses for a micro projector. "This process is suitable for mass production, which makes the new device more cost-effective," said Sieler. It can be used to convey whether the user or how to use these projectors and other information to the smart phone sensor, is a very advanced technology. Sieler explained, "these images are not visible to the human eye to the infrared to overlap. If the user's finger breaks one of these images, the sensor will temporarily hold the image and move it to the next image. "However, the advent of the real distance projector may also need three to four years, because the need to construct a new projection technology with high pixel density in the components of digital imaging systems. The researchers plan to show a new LED projector prototype at the Optatec traders show in Frankfurt in May this year, which is ideal for playback of static images. It is said that the device size is only 2cm x 2cm.