Projector light source dimming using metadata from future frames

Patent metadata

Field	Value
Publication number	US-11632527-B2
Application number	US-201917280009-A
Country	US
Kind code	B2
Filing date	Sep 25, 2019
Priority date	Sep 26, 2018
Publication date	Apr 18, 2023
Grant date	Apr 18, 2023

Abstract

A projection display system comprises a light source configured to emit a light in response to a content data; an optical modulator configured to modulate the light; and a controller configured to adjust a light level of the projection display system based on the content data and a metadata relating to a future frame, thereby to reduce a perceptibility of a visual artifact.

First claim

What is claimed is:

1. A projection display system, comprising:
a light source configured to emit a light in response to a content data having a dynamic range;
an optical modulator configured to modulate the light, the optical modulator having a dynamic range; and
a controller configured to reduce a perceptibility of a visual artifact by compressing, based on the content data and a metadata relating to a future frame, the dynamic range of the content data to be below the dynamic range of the optical modulator.

2. The projection display system according to claim 1 , wherein the controller is further configured to obtain ambient condition data and wherein the ambient condition data includes at least one of a data corresponding to a room reflection characteristic, a data corresponding to a screen gain, or a data corresponding to an ambient light level.

3. The projection display system according to claim 1 , wherein the controller is configured to adjust the light level of the projection display system by performing a partial dimming.

4. The projection display system according to claim 1 , wherein the controller is configured to adjust the light level of the projection display system by performing a small-bright-object compensation.

5. The projection display system according to claim 1 , wherein the light source is a laser light source configured to emit the light.

6. The projection display system according to claim 5 , wherein the controller is configured to adjust the light level of the projection display system by performing at least one of a pulse skipping on the laser light source, an amplitude modulation on the laser light source, or an attenuation on the light.

7. The projection display system according to claim 1 , wherein the light source includes a first light emission device configured to emit a first color light, a second light emission device configured to emit a second color light, and a third light emission device configured to emit a third color light.

8. The projection display system according to claim 7 , wherein the controller is configured to adjust a light level for the first color light, the second color light, and the third color light independently.

9. The projection display system according to claim 7 , wherein the controller is configured to adjust a light level for the first color light, the second color light, and the third color light collectively.

10. The projection display system according to claim 1 , wherein the visual artifact is a dark pumping effect.

11. The projection display system according to claim 1 , wherein the controller is further configured to obtain ambient condition data and reduce the perceptibility of the visual artifact by adjusting the rate-of-change of the brightness of the light source based on the ambient condition data.

12. The projection display system according to claim 11 , wherein the ambient condition data includes a room reflection characteristic.

13. The projection display system according to claim 11 , wherein the ambient condition data includes a data corresponding to a screen gain.

14. The projection display system according to claim 11 , wherein the ambient condition data includes a data corresponding to an ambient light level.

15. The projection display system according to claim 1 , wherein the visual artifact is a dark pumping effect and wherein the controller is configured to reduce the perceptibility of the dark pumping effect by the compressing of the dynamic range of the content data to be below the dynamic range of the optical modulator.

16. A non-transitory computer-readable-medium storing instructions that, when executed by a processor of a projection display system comprising a light source and an optical modulator, cause the projection display system to perform operations comprising:
receiving a content data;
receiving an ambient condition data;
emitting a light, by the light source, in response to the content data;
modulating the light, by the optical modulator; and
reducing a perceptibility of a visual artifact by compressing, based on the content data and a metadata relating to a future frame, the dynamic range of the content data to be below the dynamic range of the optical modulator.

17. The non-transitory computer-readable-medium according to claim 16 , wherein the ambient condition data includes at least one of a data corresponding to a room reflection characteristic, a data corresponding to a screen gain, or a data corresponding to an ambient light level.

Assignees

• Dolby Laboratories Licensing Corp

Inventors

• Richards Martin J
• Lippey Barret
• Pertierra Juan P
• Khaydarov Dzhakhangir V
• Dewald Duane Scott
• Wainwright Nathan Shawn
• Hennigan Darren
• Jackson John David

Classifications

• H04N9/3194

  including sensor feedback · CPC title

• H04N9/3182 Primary

  Colour adjustment, e.g. white balance, shading or gamut (white balance per se H04N9/73; control of amplitude of colour signals H04N9/68; colour control circuits for displays in general G09G5/02, G09G3/2003, G09G3/3607) · CPC title

• H04N9/3164

  using multiple light sources · CPC title

• H04N9/3161

  using laser light sources (using laser beams scanning the display screen H04N9/3129) · CPC title

• H04N9/3155 Primary

  for controlling the light source (light source control per se H05B35/00 – H05B47/00; control of an illumination source for displays in general G09G3/3406) · CPC title