Los Angeles - RealD, a provider of digital 3D movie theater projection systems, announced on Tuesday that movie exhibitor Cinemark Holdings will add up to 1,500 RealD 3D screens to its circuit. Cinemark operates 408 theaters and over 4,600 screen in 38 states and 12 countries including Mexico. RealD said the deal will put it past the 5,000 screen installation mark worldwide.