be designed to detect these two distinct wavelengths of infrared light allowing for greater differentiation among objects encoded with infrared radiation on display 116 some objects can be encoded with infrared wavelength 1 and other objects encoded with infrared wavelength 2 infrared detectors 120 can provide feedback to data controller 122 based upon which infrared wavelength is detected alternatively the infrared radiation can be passed by a u201c long u201d red filter as depicted in fig3 b here the bandwidth of the red filter is extended so that it passes not only red wavelengths but also any infrared wavelengths for use in system 100 either of the filters depicted in fig3 or any other appropriate filter can be used as the color wheel in fig2 infrared light is a suitable choice for use in a dlp u00ae system to encode objects for a variety of reasons infrared light does not cause harm like other types of radiation for example ultraviolet light also infrared lasers are well developed and used in a variety of applications so they have become efficient and relatively inexpensive to use compared to other technologies fig4 shows an example embodiment of infrared encoded objects on a display 116 fig4 a shows an image on display 116 created by a dlp u00ae system 100 when the red green and blue wavelengths are passed through system 100 the images in fig4 a are transmitted to display 116 the red green and blue wavelengths are displayed at a rate sufficiently high so that a user.