Patent attributes
An optical system having an iris controlled in real time and a control method of amount of light thereof. The optical system includes a light source, a light modulator modulating a light emitted from the light source to a certain image, a driving part controlling the light modulator to produce the certain image and outputting luminance information of the certain image, a projector projecting the certain image, a screen on which the projected image is formed, a projection iris controlling an amount of light projected from the light modulator onto the screen, and a iris controller receiving the luminance information of the certain image from the driving part and controlling the projection iris corresponding to the luminance information of the certain image. Since the opening range of the iris is controlled in real time, the contrast ratio (C/R) is improved.
