Device and method for reducing speckle in projected images

摘要

An image projector includes a light source for displaying light and a diffusing screen coupled to an in-plane vibrator. The diffusing screen is positioned to receive the display light from the light source and generate phase-modulated display light. The image projector also includes a collimating element positioned to receive the phase-modulated display light. The image projector further includes a display panel positioned to receive the phase-modulated display light after being collimated by the collimating element. The display panel is configured to generate a projectable image using the phase-modulated display light.

主权项

1. An image projector comprising:
first, second, and third light modules, each of the light modules comprising:
a light source; anda reflective diffusing screen coupled to an in-plane vibrator that includes at least one comb-drive actuator connected to move the reflective diffusing screen in-plane, the reflective diffusing screen including a homogeneous micro-lens array, wherein the reflective diffusing screen is positioned to receive light from the light source and generate phase-modulated light, and wherein the phase-modulated light from the light source of the first light module is a first color light, the phase-modulated light from the light source of the second light module is a second color light, and the phase-modulated light from the light source of the third light module is a third color light; a dichroic combiner cube coupled to receive and combine the first color light, the second color light, and the third color light into display light; a collimating element positioned between each of the light modules and the dichroic combiner cube to collimate the first color light, the second color light, and the third color light; and a display panel positioned to receive the display light, wherein the display panel is configured to generate a projectable image using the display light.