Date: 04/08/2010

Vishay's new SMT Infrared receivers for LCD shutter glasses used with 3D TVs

Vishay has introduced two infrared receivers developed for LCD shutter glasses used with 3D TV sets. The surface-mount TSOP75D25 and TSOP35D25 IR receivers are designed to be assembled into active 3D glasses.

Th LCD shutter glasses turn dark on application of voltage. The function of these IR receivers is to send timing signals that alternatively darkens over one eye and then the other, in sync with the refresh rates of the screen thus creating a 3D effect.

These receivers operate at carrier frequencies of 25kHz, which is lower than the carrier frequency used in standard IR remote control systems, which is generally 32-40kHz and therefore avoiding interference with TV and set top box remote controls. These IR receivers are designed to receive signals from IR emitters with wavelength of 830nm thus avoiding interference with TV remote control emitters and receivers, which operate at a wavelength of 940 nm.

The TSOP75D25 and TSOP35D25 IR receivers enable suppression of optical noise from compact fluorescent lights, LCD backlights, and plasma panels. These IR receivers pack a photodiode, amplifier, automatic gain control, band pass filter, demodulator, and control IC into a single package. These receivers can receive transmitted signal patterns with a minimum burst length of 6 cycles and frame rates of up to 200Hz. A single emitter can be used in the TV to achieve transmit distance of over 26 meters.

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( which allows for significant head movement without signal loss. The TSOP75D25 measures 2.3 mm x 3.0 mm x 6.8 mm and has dual lenses while the TSOP35D25 measures 4.0 mm x 5.3 mm x 7.5 mm and has a single lens.

Availability: Samples of the new TSOP75D25 and TSOP35D25 are available now.