There’s a 3DTV webinar, 3D-TV IR Receivers and Emitters, on the Vishay Intertechnology’s website. The webcast explains how infrared receivers work in 3DTV active shutter glasses. Infrared receivers are used in 3DTV glasses where they receive a synchronization signal from the 3D television set and open and close LCD shutters in each lens of the glasses to create the stereoscopic 3DTV effect.
Vishay’s TSOP75D25 and TSOP35D25 infrared receivers were developed for the LCD shutter glasses application. The receivers operate on a carrier frequency of 25 kHz, which is the carrier frequency for 3D TV active glasses synchronization. The TSOP75D25 and TSOP35D25 are designed to receive the 3D synchronization signals from an 830nm or 850nm emitter, instead of the 940 nm wavelength used by remote control emitters for TVs and set-top boxes.
TSOP75D25 and TSOP35D25 Infrared Receivers Features
- Integrated photodiode, amplifier, automatic gain control, band pass filter, demodulator, and control IC reduce the weight of 3DTV active glasses
- Ultra-low current consumption maximizes the battery life
- Modulated synchronization signals (instead of baseband signals)
- Single emitter can be used in the TV to achieve a synchronize transmit distance of 26+ meters
- Surface mount devices that can be mounted in a side or top view
- Viewing angle of ± 50°
- TSOP75D25 measures 2.3 mm x 3.0 mm x 6.8 mm and has dual lenses
- TSOP35D25 measures 4.0 mm x 5.3 mm x 7.5 mm and has a single lens
More info: 3D-TV IR Receivers and Emitters Webinar