Method and system for generating color using a low-resolution spatial color modulator and a high-resolution modulator

• US 7,092,137 B2
• Filed: 10/07/2004
• Issued: 08/15/2006
• Est. Priority Date: 01/08/2004
• Status: Active Grant

• Current Assignee: Dolby International AB (Dolby Laboratories Incorporated)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Childers, Winthrop D.
• Primary Examiner(s): Dang, Hung Xuan
• Assistant Examiner(s): TRA, TUYEN Q
• Application Number:
  US10/962,277
• Publication Number:
  US 20050162725A1
• Time in Patent Office: 677 Days
• Field of Search: 359/245, 359/237, 359/242, 359/443, 359/453, 359/456, 359/460, 382/162, 353/31, 345/32, 345/38, 348/744
• US Class Current: 359/237
• CPC Class Codes: G09G 2300/023 Display panel composed of stacked panels
• CPC Class Codes: G09G 2310/0235 Field-sequential colour display
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 3/34 by control of light from an independent source
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: H04N 9/3126 for spatial light modulators in series

Abstract

A method and system for generating an image. The image includes an array of low-resolution pixels each including a plurality of high-resolution pixels. The display system includes a first light modulator having an array of color pixel elements wherein each of the color pixel elements is configured to independently modulate a spectral distribution of one of the low-resolution pixels and a second light modulator having an array of gray scale pixel elements each configured to independently modulate a gray scale of the high-resolution pixels. The first and second light modulators are configured to cooperatively operate such that each of the low-resolution pixels includes a number of groups of high-resolution pixels each having a different hue.

Claims

1. A display system, comprising:

a low-resolution modulator having an first array of pixel elements that independently modulate color to create a low-resolution image; and

a high-resolution modulator receiving the low-resolution image and having a second array of pixel elements each configured to further refine the low-resolution image to create a high-resolution image.

2. The display system of claim 1, further comprising:

a light source; and

wherein the high-resolution modulator modulates light from the light source before the modulated light is received by the low-resolution modulator.

3. The display system of claim 1, further comprising:

a viewing surface that receives the high-resolution image; and

wherein the viewing surface includes a plurality of display pixels which cooperatively interact to form images on the viewing surface.

4. The system of claim 1, wherein said high-resolution images includes a first group of high-resolution pixels having a first hue and a second group of high-resolution pixels having a second hue within an area bounded by a low-resolution pixel.

5. The system of claim 4, further comprising an image processing unit coupled to said low and high resolution modulators, said image processing unit configured to allow said cooperative operation of said low and high resolution modulators.

6. The system of claim 5, wherein said high-resolution image is generated during a frame period during which said image processing unit defines a first color sub-frame corresponding to each of said first group of high-resolution pixels and a second color sub-frame corresponding to each of said second group of high-resolution pixels.

7. The system of claim 6, wherein said first color sub-frame defines a time period during which said first group of high-resolution pixels are activated and said second color sub-frame defines a time period during which said second group of high-resolution pixels are activated.

8. The system of claim 6, wherein said first color sub-frame defines a first set of time slices during which said first group of high-resolution pixels are activated and said second color sub-frame defines a second set of time slices during which said second group of high-resolution pixels are activated.

9. The system of claim 6, wherein said first color sub-frame defines a black state for said second group of high-resolution pixels and said second color sub-frame defines a black state for said first group of high-resolution pixels.

10. The system of claim 1, wherein said high-resolution image is generated during a frame period and wherein for pixel element of the low resolution array, said image processing unit selects between a non-transition low-resolution pixel mode and a transition low-resolution pixel mode.

11. The system of claim 1, wherein said high-resolution modulator is selected from the group consisting of an analog based light modulator, a pulse-width modulation based light modulator, a liquid crystal display (LCD) panel, a liquid crystal on silicon (LCOS) device, and an array of micro-mirrors.

12. The system of claim 1, wherein said low-resolution modulator comprises a diffractive light device (DLD).

13. The system of claim 1, wherein said low-resolution modulator comprises a digital light filter.

14. A system for modulating a light beam to generate an image, comprising:

means for generating a spatial color distribution of an array of low-resolution pixels; and

means for receiving the spatial color distribution and refining each of the low-resolution pixels to create a number of groups of high-resolution pixels each having a different hue within each low-resolution pixel.

15. The system of claim 14, further comprising:

a means for generating light; and

wherein the means for refining each of the low-resolution pixels modulates light from the means for generating light before the modulated light is received by means for generating a spatial color distribution of an array of low-resolution pixels.

16. The system of claim 14, further comprising:

a means for viewing images that receives the groups of high-resolution pixels; and

wherein the means for viewing includes a plurality of display pixels which cooperatively interact to form images on the viewing surface.

17. The system of claim 16, wherein for each individual low-resolution pixel of said low-resolution pixels, said system further comprises:

means for selecting a non-transition low-resolution pixel mode if said individual low-resolution pixel includes high-resolution pixels that are to be of only one hue; and

means for selecting a transition low-resolution pixel mode if said individual low-resolution pixel includes high-resolution pixels that are to be of multiple hues.

18. The system of claim 14, wherein said number of groups of high-resolution pixels includes a first group of high-resolution pixels having a first hue and a second group of high-resolution pixels having a second hue.

19. The system of claim 18, further comprising means for defining a first color sub-frame defining said first hue and a second color sub-frame defining said second hue.

20. The system of claim 19, wherein said image is defined during a frame period and wherein said first color sub-frame corresponds to at least one portion of said frame period and said second color sub-frame corresponds to at least a second portion of said frame period.

21. The system of claim 20, wherein said first group of high-resolution pixels has a black state for said at least one portion of said frame period and said second group of high-resolution pixels has a black state for said second portion of said frame period.