Systems and methods of managing metameric effects in narrowband primary display systems

• US 9,711,096 B2
• Filed: 08/03/2015
• Issued: 07/18/2017
• Est. Priority Date: 07/11/2011
• Status: Active Grant

• Current Assignee: Dolby Laboratories Licensing Corporation (Dolby Laboratories Incorporated)
• Original Assignee: Dolby Laboratories Licensing Corporation (Dolby Laboratories Incorporated)
• Inventors: Daly, Scott, Kozak, Eric
• Primary Examiner(s): Haley, Joseph
• Application Number:
  US14/816,179
• Publication Number:
  US 20150339990A1
• Time in Patent Office: 715 Days
• Field of Search: None
• CPC Class Codes: G03B 21/2033 LED or laser light sources
• CPC Class Codes: G03B 33/06 by additive-colour projection apparatus
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2310/0235 Field-sequential colour display
• CPC Class Codes: G09G 3/001 using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background slide projectors per se G03B23/00 = 42 HP
• CPC Class Codes: G09G 3/34 by control of light from an independent source
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: H04N 9/3158 for controlling the spectrum
• CPC Class Codes: H04N 9/3164 using multiple light sources
• CPC Class Codes: H04N 9/3182 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

Abstract

Several embodiments of display systems that use narrowband emitters are disclosed herein. In one embodiment, a display system comprises, for at least one primary color, a plurality of narrowband emitters distributed around the primary color point. The plurality of narrowband emitters provides a more regular power vs. spectral distribution in a desired band of frequencies.

Claims

1. A display system comprising:

a set of narrowband emitters positioned in an optical system configured for display of images, wherein at least one subset of the plurality of emitters comprises a plurality of emitters corresponding to a primary color;

a controller configured to receive input image data,

calculate a luminance strength of at least a subset of colors corresponding to a pixel of the input image data, and

if a luminance strength of the pixel is greater than the luminance strength of the narrowband emitters, scale the narrowband emitters to match color of a triplet corresponding to the pixel;

wherein said scaling comprises sending control signals to frequency modulate light emitted by said at least one plurality of narrowband emitters.

2. The display system as recited in claim 1 wherein said display system comprises a laser projector.

3. The display system as recited in claim 2 wherein said laser projection display system comprises a direct view display.

4. The display system as recited in claim 3 wherein said direct view display further comprises:

a plurality of narrowband LED emitters; and

a diffuser.

5. The display system as recited in claim 4 wherein said direct view display further comprises:

a plurality of narrowband LED emitters; and

a plurality of tile waveguides.

6. The display according to claim 1, further comprising a modulating panel illuminated by the emitters and configured to further modulate light emitted by the emitters to produce an image.

7. The display according to claim 6, wherein point spread functions of adjacent narrowband emitters comprise a Gaussian curve PSF that merge.

8. The display according to claim 7, wherein the PSFs mixed with the aid of a diffuser.

9. The display according to claim 1, wherein the narrowband emitters comprise at least three groups of four narrowband emitters, wherein each group resides essentially in a same color at an apex of the CIE diagram.

10. The display according to claim 1, wherein the narrowband emitters comprise a first set of emitters equally spaced at a first color peak of the CIE diagram, a set emitters equally spaced at second color peak of the CIE diagram, a set of emitters equally spaced at a third color peak of the CIE diagram.

11. The display according to claim 10, wherein the sets of emitters each comprise 4 emitters.

12. The display according to claim 10, wherein the emitters comprise red, green, and blue lasers.

13. The display according to claim 1, wherein at least one plurality of narrowband emitters emit a substantially even power distribution in a desired band when said at least plurality of narrowband emitters are turned on.

14. The display according to claim 1, wherein the display comprises a laser projector.

15. The display according to claim 1, wherein the emitters are spaced apart in frequency sufficient to eliminate common metameric issues experienced by consumers when viewing displayed images.

16. The display according to claim 1, wherein the display comprises a laser projector in a large format theater.

17. A method, comprising the steps of:

Energizing a plurality of sets of narrowband emitters positioned in an optical system configured for display of images, wherein at least one subset of the plurality of emitters comprises a plurality of emitters corresponding to a primary color;

Receiving image data comprising image data pixels;

Calculating a luminance strength of at least a subset of colors corresponding to a pixel of the input image data, and

if a luminance strength of the pixel is greater than the luminance strength of the narrowband emitters, scaling the narrowband emitters to match color of a triplet corresponding to the pixel;

wherein said scaling comprises sending control signals to frequency modulate light emitted by said at least one plurality of narrowband emitters.

18. A method comprising the steps of:

energizing a first plurality of laser emitters comprising a least 3 lasers of equally spaced frequencies at a first color peak of a CIE diagram comprising a color gamut of a display;

energizing a second plurality of laser emitters comprising a least 3 lasers of equally spaced frequencies at a second color peak of a CIE diagram comprising a color gamut of a display;

energizing a third plurality of laser emitters comprising a least 3 lasers of equally spaced frequencies at a third color peak of a CIE diagram comprising a color gamut of a display;

wherein the energizations of at least one of the plurality of laser emitters comprise a scaling amongst the emitters based on the relative strengths of pixel a luminance as encoded in the image data compared to the luminance capabilities of emitters corresponding to the pixel; and

wherein the scaling comprise a frequency modulation of one or more of the emitters.

19. The method according to claim 18, wherein the method is performed in a digital cinema laser projector.