Variable-focus projection display system applying phase-type spatial light modulator

Abstract

The invention belongs to the field of projection display, in particular relates to a variable-focus projection display system applying a phase-type spatial light modulator. The variable-focus projection display system comprises a light source, a beam expander, a computer, an amplitude-type spatial light modulator, the phase-type spatial light modulator and a display screen, the beam expander, the computer, the amplitude-type spatial light modulator, the phase-type spatial light modulator and the display screen are sequentially arranged on a light path of the light source, a light beam is incident to the beam expander after generated from the light source and then projected to the amplitude-type spatial light modulator after collimation, the computer loads a projection image to the amplitude-type spatial light modulator, the light beam loaded with image gray information is irradiated to the phase-type spatial light modulator, the computer calculates and generates a required ideal phase grayscale image of a focal lens according to a phase distribution function of the lens and loads the ideal phase grayscale image to the phase-type spatial light modulator to modulate the image, and the modulated image is projected on the display screen. By the variable-focus projection display system, a variable-focus adjustment mechanism and a projection lens group in a traditional projection display system can be omitted, all-electronic rapid focusing without mechanical motion is achieved, and meanwhile, the functions of image distortion correction, image scaling and translation are achieved.

Description

technical field [0001] The invention belongs to the field of projection display, and in particular relates to a variable-focus projection display system using a phase-type spatial light modulator. Background technique [0002] At present, projection display systems have been widely used in education, business and all aspects of life. When using a projection display system, it is often necessary to manually adjust the projection lens so that the image surface of the lens is on the same plane as the display screen to obtain a clear image. [0003] The projection display system relies on the zoom adjustment mechanism and the projection lens group to realize the zoom of the image. The zoom adjustment mechanism is composed of zoom rings, rollers, shrapnel and other mechanical parts. The projection lens group is composed of a series of lenses such as convex lenses, concave lenses, cemented lenses, and aspheric mirrors. It is often complex in structure and large in size. The asph...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the existing traditional projection display system mechanical zoom system, such as complex structure, bulky volume, slow zoom speed, easy damage, etc., the present invention provides a variable focus projection display system using a phase-type spatial light modulator, which simplifies the zoom The structure of the system reduces the volume of the system, enhances the reliability of the system, and can realize the functions of fast zooming of the projection display system, image distortion correction, image zooming and translation, etc.

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