- 06th November 2006

OSTAR Version For Rear Projection Television

OSRAM has developed the OSTAR Projection RPTV (rear projection television) specifically for rear projection television. This efficient high-power LED light source is suitable for all projection systems, offers vibrant colours and is dimmable. It also has a long life (20,000 to 50,000 hours depending on the operating conditions) and short switching times. OSTAR Projection RPTV is suitable for all projection systems, whether they are based on DMD, LCoS or LCD technology. It has been developed specifically for imagers of 0.85 to 0.95 inches used in systems with an aperture size of 2.0 to 2.4.

Depending on the colour, the LEDs are manufactured in thin-film technology (red) or ThinGaN technology (blue, green). As pure surface emitters with optimum light injection, these light sources are extremely efficient. In combination with the appropriate imager they achieve the system output of 300 lm needed for RPTV.

For rear projection television, one red, one blue and one green OSTAR are used - each with a special lens. For an angle of 18° (green) and 25° (red and blue) the light sources achieve a brightness of 1250 lm (green), 750 lm (red) and 180 lm (blue) in 1 A DC mode. Much higher values are possible in pulsed mode and under appropriate operating conditions.

OSTAR Projection RPTV is in keeping with the trend for large-format high-definition TVs with intense colours. An RPTV with a screen diagonal of 56" equipped with these LEDs can achieve a luminance of up to 500 cd/m². This ensures that the picture has good contrast, vibrant colours and razor-sharp definition. Thanks to the short switch-on times the picture is available as soon as the TV is switched on. There is no delay at all. With their long life these light sources will last the life of the TV and will soon offset their higher acquisition costs.

Meanwhile, the Science Award from the Stifterverband (a German foundation for the promotion of science) was presented to the “Compact LED Light Sources” project team on October 18, 2006 at the annual Fraunhofer conference in Bremen. In addition to OSRAM Opto Semiconductors the team includes the Fraunhofer Institute for Applied Optics and Precision Engineering IOF, Carl Zeiss Jena and Siemens VDO Automotive.

Web: http://www.osram-os.com