Back to results
US 9,753,298 B2Granted
Reducing speckle in projected images
AssigneeOmniVision Technologies, Inc.
InventorYi-Wei Liu
Life of this patent
Estimating the term…
Abstract
A despeckle optical system for an image projector includes a diffuser, an in-plane vibrator, a microlens array, and a vibrator driver. The in-plane vibrator is coupled to vibrate the diffuser along a vibration plane. The vibrator driver is coupled to drive the in-plane vibrator and configured to drive the in-plane vibrator at different vibration amplitudes for averaging the intensity of speckle in display light that propagates through the diffuser via the microlens array.
Claims7
An image projector comprising:
- at least one light source for generating display light;
- a despeckle module including:
- a diffuser;
- a first microlens array disposed between the at least one light source and the diffuser, wherein the diffuser is positioned next to the first microlens array to receive the display light from the at least one light source through the first microlens array;
- an in-plane vibrator coupled to vibrate the diffuser along a vibration plane;
- and
- a vibrator driver coupled to drive the in-plane vibrator, wherein the vibrator driver is configured to drive the in-plane vibrator at different vibration amplitudes for averaging the intensity of speckle in the display light;
- a collimation lens positioned between the at least one light source and the first microlens array;
- a display panel positioned to receive the display light from the despeckle module, wherein the display panel is configured to generate a projectable image using the display light;
- and
- a second microlens array positioned between the display panel and the diffuser, wherein the second microlens array is positioned next to the diffuser, wherein illumination microlenses in the second microlens array have negative optical power, and wherein the display light encounters the second microlens array after the diffuser.
8 more elements
A despeckle optical system for an image projector, the despeckle optical system comprising:
- a diffuser;
- an in-plane vibrator coupled to vibrate the diffuser along a vibration plane;
- a first microlens array positioned adjacent to the diffuser;
- a vibrator driver coupled to drive the in-plane vibrator, wherein the vibrator driver is configured to drive the in-plane vibrator at different vibration amplitudes for averaging the intensity of speckle in display light that propagates through the diffuser via the first microlens array;
- a second microlens array positioned next to the diffuser, wherein the diffuser is positioned between the second microlens array and the first microlens array, and wherein illumination microlenses in the second microlens array have negative optical power;
- and
- a collimation lens, wherein the first microlens array is positioned between the diffuser and the collimation lens.
4 more elements
Dependencies are inferred from the claim text.