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Optoelectronics/Displays??

Inside TI's DLP LightCrafter

Posted: 05 Dec 2014 ?? ?Print Version ?Bookmark and Share

Keywords:DLP? LightCrafter? pico projectors? micromirror?

Conclusions

A new platform for developing Texas Instruments pico projectors under the LightCrafter brand use a digital light processor (DLP) based on the technology with almost half a million of micromirrors to generate an image. RGB LEDs are used as a light source, which can emit up to 20lumen of light. However, if you use active cooling and thermal management, you can obtain over 50lumens, so you can use LightCrafter in various conditions.

DLP LightCrafter can be employed as a portable projector with an HDMI input, as well as a platform for projecting structured light patterns and complex lighting with the possibility of changing the operating wavelength (from ultraviolet to almost infrared light).

The option of projecting structured light patterns makes it possible to use LightCrafter for instant characterisation and recognition of 3D objects without touching them. 3D scanning is based on projecting a moving strip of light to the objects, as well as subsequent analysis of measurement of the deformation of the reflected band using a 3D shape reconstruction algorithm.

This function can be used in contactless fingerprint scanners to identify people. Besides its use for biometric, facial, dental and medical scans, DLP can be used in various applications ranging from industrial control systems to a variety of scientific instruments. By using additional FPGA, you can increase the frequency of outputting light patterns up to 4,000 per second.

3D scanning implementation needs an external camera and software that implements the required 3D processing algorithm. The configurable platform gate input / output helps synchronise camera frame capture (for the camera and other peripherals) with projected light pattern frames.

Developers can create, store and display the projected image using a programming interface (API) via USB or a user-friendly graphical user interface (GUI).

The powerful digital processor TMS320DM365 and ARM core-based Linux make it possible to develop a fully functional embedded system. Therefore, the use of DLP LightCrafter in new developments helps cut the design cycle, as well as achieve a small form factor and a low cost of the final product.

- Julien Happich
??EE Times Europe


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