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IR receivers target 3D-TV glasses

Posted: 06 Aug 2010     Print Version  Bookmark and Share

Keywords:infrared  receiver  LCD  3D glasses  TV 

Vishay Intertechnology Inc. rolls out two surface-mounted infrared (IR) receivers, TSOP75D25 and TSOP35D25, which are designed to be assembled into active LCD shutter glasses meant for 3D-ready TV. The receivers receive infrared signals from the TV and ensure that the glasses' LCD shutters open and close in proper synchronisation to create the 3D effect.

The receivers are designed to operate on a carrier frequency of 25kHz, which is lower than that used by standard remote control systems and thus helps avoid possible interference from TV and set-top box remote controls. Because TV remote control emitters and receivers operate at a wavelength of 940nm, the TSOP75D25 and TSOP35D25 are designed to receive the 3D synchronisation signals from an 830nm or 850nm emitter, further avoiding the possibility of interference.

The receivers also offer suppression of optical noise from compact fluorescent lights, LCD backlights, and plasma panels.

The TSOP75D25 and TSOP35D25 pack a photodiode, amplifier, automatic gain control, band pass filter, demodulator, and control IC into a single tiny package. The TSOP75D25 measures 2.3mm x 3.0mm x 6.8mm and has dual lenses, while the TSOP35D25 measures 4.0mm x 5.3mm x 7.5mm and has a single lens.

The TSOP75D25 and TSOP35D25 are surface mount devices that can be mounted in a side or top view. They both have a viewing angle of ±50°.

Samples are available now. Production orders have a lead time of six to eight weeks. Pricing for U.S. delivery in small quantities is Rs.46.97 ($1).

- EE Times

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