Static speckle removal device based on lens array and laser projector

Abstract

The invention provides a static speckle removal device based on a lens array. The static speckle removal device is arranged between a laser source and a projection lens of a laser projector. The lens array is located behind the laser source and comprises a plurality of sub-lenses arranged in an array mode, the plane where the sub-lenses are located is perpendicular to an optical axis, and the sub-lenses are used for dividing light emitted by the laser source to generate sub-light beams. A static phase modulator is located behind a light path of the lens array and matched with the lens array in position, and the static phase modulator is used for enabling the sub-light beams to carry independent patterns. An integral lens is located at the position, confocal with the lens array, behind a light path of a phase plate array, a picture generator is located on the focal plane of the integral lens, the projection lens is arranged behind a light path of the picture generator, the sub-light beams carrying the independent patterns are converged and superposed to the picture generator on the focal plane of the integral lens by the integral lens, and the picture generator generates a picture formed by superposition of the sub-light beams carrying the independent patterns according to the independent patterns carried by the sub-light beams.

Description

technical field [0001] The invention relates to the technical field of laser display, in particular to a lens array-based static speckle elimination device and a laser projector. Background technique [0002] Compared with traditional displays, laser projection displays have the advantages of high brightness, good saturation, and wide color gamut. However, due to the high coherence of the laser light source, speckle phenomenon will occur during projection, which seriously affects the quality of the image. There are many ways to eliminate speckle, which can be roughly divided into dynamic and static. Dynamic dispersive speckles will bring mechanical vibrations, resulting in an increase in the volume and energy consumption of the instrument. For example, by vibrating the Hadamard (Hadamard) matrix phase plate, the resolution points corresponding to each detection point of each detector can be within the integration time Superimpose multiple independent patterns with differen...

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Problems solved by technology

However, this method brings mechanical vibration and additional energy loss, which increases the size and complexity of the system. Due to the existence of vibration, some phase plates cannot be used within a certain period of time, reducing the efficiency of the phase plate. Utilization of

The static dispersive speckle method of phase modulation is achieved by applying different voltages to each sub-lens of the liquid lens array. Loading voltage, complex drive circuit

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