Projection synchronization system

Projektionssynchronisationssystem

Système de synchronisation de projection

Abstract

An alternate eye 3-d projection system has a projector (2) projecting alternate eye left and right images, has alternating eye 3-d glasses (7) alternating between left and right lens transmissiveness, and has a phase delay unit (29) synchronizing the left lens trans­missiveness to left images and right lens transmissive­ness to right images. A timing shutter (17) is driven through a mechanical link to the projector primary mechanism at a frequency proportional to the frequency of the transition between images. A sensor (21) outputs pulses according to the rotational frequency of the timing shutter. The phase delay unit receives the pulses, a multiplier (31) multiplies the frequency of the pulses, a phase lock loop (33) locks on to the frequency and a counter (35) counts the pulses. After a preset delay the counter outputs a pulse. The delay is adjustable. The counter pulse enables a 60 KHz oscillator (43). The oscillations are counted by another counter (41) and passed to a transmitter (6). The 60 KHz oscillations are disabled when the other counter (41) reaches a preset amount. The other counter (41) sets the duty cycle of the transmitter. Each of the components in the unit is duplicated in a back-up section. The back-up section is enabled when the primary phase lock loop is not locked on and the back-up phase locked loop is locked on. (Fig. 5)

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Patent Citations (4)

    Publication numberPublication dateAssigneeTitle
    DE-3228238-A1February 09, 1984Mostafa NourianMethod and device for transmitting stereo colour pictures
    EP-0233636-A2August 26, 1987Sharp Kabushiki KaishaVirtual stereographic display system
    FR-2569281-A1February 21, 1986France Etat ArmementDispositif d'alimentation autonome pour dispositif d'observation, notamment a effet stereoscopique
    US-4625290-ANovember 25, 1986University Of FloridaApparatus and method for producing a three-dimensional display on a video display device

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    US-2011157329-A1June 30, 2011Acer IncorporatedMethod for switching to display three-dimensional images and digital display system
    US-8624965-B2January 07, 2014Samsung Electronics Co., Ltd.3D glasses driving method and 3D glasses and 3D image providing display apparatus using the same