Patent ID: 8310756
Filing Date: 2012-11-13
Classification: G03B

Abstract:
1. An image projection screen comprising: a transparent screen comprising a transparent front element and a transparent rear element; a thin inner space between the transparent front element and the transparent rear element, wherein said thin inner space has a thickness of 0.1-50 mm; a water reservoir including water, said water reservoir arranged to communicate fine water drops of the water to the thin inner space; and a vibration unit including an ultrasonic vibrator, said vibration unit configured to inject ultrasonic vibrations into the water of the reservoir to create said fine water drops, wherein, when the vibration unit is operated, the communication between the water reservoir and inner space allows the fine water drops to flow into the thin inner space so that the image projection screen is configured to serve as an image screen for a projector, and wherein, when the vibration unit is not operated, the fine water drops are not formed so that the image projection screen is transparent to enable viewing from inside or outside the image projection screen.