Vishay hosts video webinar on 3DTV active glasses infrared receivers
January 07, 2011 // Julien Happich
Vishay Intertechnology recently added a video webinar on its website, detailing how infrared receivers work in 3DTV active shutter glasses. The infrared receiver is used in 3DTV glasses where it receives a synchronization signal from the 3D television set and opens and closes LCD shutters in each lens of the glasses to create the stereoscopic 3DTV effect.
Vishay's TSOP75D25 and TSOP35D25 infrared receivers were developed specifically for the LCD shutter glasses application. The receivers operate on a carrier frequency of 25 kHz, 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.
To further avoid the possibility of interference, the TSOP75D25 and TSOP35D25 are designed to receive the 3D synchronization signals from an 830nm or 850nm emitter, rather than on the 940nm wavelength used by remote control emitters for TVs and set-top boxes. The devices suppress optical noise from compact fluorescent lights, LCD backlights, and plasma panels.
They integrate a photodiode, amplifier, automatic gain control, band pass filter, demodulator, and control IC into a single tiny package, which helps minimize the weight of 3DTV active glasses, while their ultra-low current consumption maximizes the battery life. Because these new IR receivers receive modulated synchronization signals versus baseband signals, a single emitter can be used in the TV to achieve a synchronize transmit distance of more than 26 meters.
The 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 2.3x3.0x6.8mm and has dual lenses while the TSOP35D25 measures 4.0x5.3x7.5mm and has a single lens.
The 3DTV active glasses webinar can be viewed at http://www.vishay.com/landingpage/videos/opto_webinar_3d.html
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