<P> RealD 3D is a digital stereoscopic projection technology made and sold by RealD . It is currently the most widely used technology for watching 3D films in theatres . Worldwide, RealD 3D is installed in more than 26,500 auditoriums by approximately 1,200 exhibitors in 72 countries as of June 2015 . </P> <P> RealD 3D cinema technology is a polarized 3D system that uses circularly polarized light to produce stereoscopic image projection . The advantage of circular polarization over linear polarization is that viewers are able to tilt their head and look about the theater naturally without seeing double or darkened images . However, as with other systems, any significant head tilt will result in incorrect parallax and prevent the brain from correctly fusing the stereoscopic images . </P> <P> The high - resolution, digital cinema grade video projector alternately projects right - eye frames and left - eye frames, switching between them 144 times per second . The projector is either a Texas Instruments Digital Light Processing device or Sony's reflective LCOS (liquid crystal on silicon). A push - pull electro - optical liquid crystal modulator called a ZScreen is placed immediately in front of the projector lens to alternately polarize each frame . It circularly polarizes the frames clockwise for the right eye and counter-clockwise for the left eye . The audience wears circularly polarized glasses that have oppositely polarized lenses that ensures each eye sees only its designated frame . In RealD Cinema, each frame is projected three times to reduce flicker, a system called triple flash . The source video is usually produced at 24 frames per second per eye (total 48 frames / s), which may result in subtle ghosting and stuttering on horizontal camera movements . A silver screen is used to maintain the light polarization upon reflection and to reduce reflection loss to counter some of the significant light loss due to polarization filter absorption . The result is a 3D picture that seems to extend behind and in front of the screen itself . </P>

Do you need glasses for reald 3d movies