A Low-Power Fractional-Order Synchronizer for Syncless Time-Sequential Synchronization of 3-D TV Active Shutter Glasses

The 3-D TV active shutter glasses (SGs) technology requires the communication of the sync timing for time-sequential frame synchronization, in contrast to the syncless film-type patterned retarder approach. To advance our previous work based on the fractional-order timer, this paper proposes a fractional-order synchronizer, including an adaptive sync reconstructor (ASR) based on FRT for syncless frame synchronization. The FRT enables accurate synchronization regardless of sync-clock speed. The hybrid cooperation of FRT and ASR reduces the required frequency of communication of the sync packets and turns off the emitter on the TV side for perfect syncless operation. The implemented one-chip solution uses less than roughly 11% of the operating current of major commercial SG. The syncless SG technique also minimizes synchronization failure and 3-D vision crosstalk from interruption in sync packets.