Multi-primary display with spectrally adapted back-illumination

• US 7,714,824 B2
• Filed: 05/24/2004
• Issued: 05/11/2010
• Est. Priority Date: 06/11/2001
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Genoa Color Technologies Limited
• Inventors: Roth, Shmuel
• Primary Examiner(s): Lefkowitz; Sumati
• Assistant Examiner(s): Amadiz; Rodney
• Application Number:
  US10/555,781
• Publication Number:
  US 20070001994A1
• Time in Patent Office: 2,178 Days
• Field of Search: 345 31- 33, 345/77, 345 87- 90, 345/204, 345589-603, 345/690, 345694-699, 345/102, 345/4, 345/32, 348743-744, 353/31, 353 84- 86
• US Class Current: 345/88
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements
• 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 2340/0407 Resolution change, inclusive of the use of different resolutions for different screen areas
• CPC Class Codes: G09G 2340/0457 Improvement of perceived resolution by subpixel rendering
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• 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: G09G 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607
• CPC Class Codes: H04N 9/67 for matrixing camera processing pipelines for matrixing of colour signals H04N23/85

Abstract

Some embodiments of the invention provide a device, system and method for displaying a color image. According to some exemplary embodiments of the invention a device for displaying a color image may include an illumination source including a plurality of light-producing elements able to produce light of each of m different wavelength spectra, wherein m is equal to or greater than three. The device may also include an array of attenuating elements able to spatially selectively attenuate the light produced by the illumination source according to an attenuation pattern corresponding to a gray-level representation of the color image, and an array of color sub-pixel filter elements able to receive selectively attenuated light from the array of attenuating elements, each sub-pixel filter element able to transmit light of one of n different primary colors, wherein n is equal to or greater than four.

Claims

1. A device for displaying a color image comprising:

an illumination source comprising a plurality of color light sources, each able to produce respective light of each of m different wavelength spectra, wherein m is equal to or greater than three;

an array of attenuating elements, each able to selectively attenuate the light produced by said plurality of color light sources of said illumination source according to an attenuation pattern corresponding to a gray-level representation of said color image;

an array of color sub-pixel filter elements able to receive selectively attenuated light from said array of attenuating elements, each sub-pixel filter element able to transmit light of one of n different colors, wherein n is equal to or greater than four; and

an optics unit to combine said light of said plurality of color light sources to form a substantially uniform illumination of light of said n colors across said array of attenuating elements.

2. The device of claim 1, wherein said array of filter elements is juxtaposed and in registry with said array of attenuating elements such that each color sub-pixel filter element is able to receive light from one of said attenuating elements.

3. The device of claim 1 comprising driving circuitry adapted to receive input data representing said color image and to selectively activate said attenuating elements to produce said attenuation pattern.

4. The device of claim 1, wherein said array of attenuating elements comprises an array of Liquid Crystal (LC) elements.

5. The device of claim 1, wherein at least one of said sub-pixel filter elements is able to fully transmit substantially the entire spectrum of at least two of said m wavelength spectra.

6. The device of claim 1, wherein sub-pixel filter elements of two of said n different colors are able to fully transmit substantially the entire spectrum of at least one of said m wavelength spectra.

7. The device of claim 1, wherein sub-pixel filter elements of a first color of said n different colors are able to transmit light of a first, narrow spectrum, and wherein sub-pixel filter elements of a second color of said n different colors are able to transmit light of a second spectrum broader than and including said narrow spectrum.

8. The device of claim 1, wherein at least one of said n colors is reproducible by a combination of two or more of said m wavelength spectra.

9. The device of claim 1, wherein m equals six.

10. The device of claim 9, wherein said m wavelength spectra comprise two spectra of blue, a cyan spectrum, a green spectrum, a yellow spectrum and a red spectrum.

11. The device of claim 1, wherein said n colors comprise red, green, blue, and yellow.

12. The device of claim 1, wherein n equals five.

13. The device of claim 12, wherein said n colors comprise red, green, blue, cyan and yellow.

14. The device of claim 1, wherein each of said plurality of color light sources comprises one or more light emitting diodes.

15. The device of claim 1, wherein at least one of a number of said color light sources, an arrangement of said color light sources, and one or more of said wavelength spectra is selected based on at least one desired display attribute.

16. The device of claim 15, wherein said at least one display attribute comprises at least one attribute selected from the group consisting of a brightness level, a color gamut, and a relative intensity of said colors.

17. The device of claim 15, wherein the arrangement of said color light sources is selected to provide a substantially spatially uniform distribution of illumination of said m spectra produced by said illumination source.

18. A system for displaying a color image comprising:

an illumination source comprising a plurality of color light sources, each able to produce respective light of each of m different wavelength spectra, wherein m is equal to or greater than three;

a converter to convert three-primary-color input data representing said color image into converted image data representing said color image in terms of n colors;

an array of attenuating elements, each able to selectively attenuate the light produced by said plurality of color light sources of said illumination source according to an attenuation pattern corresponding to a gray-level representation of said converted image data;

an array of color sub-pixel filter elements able to receive selectively attenuated light from said array of attenuating elements, each sub-pixel filter element able to transmit light of one of n different colors, wherein n is equal to or greater than four; and

an optics unit to combine the light of said plurality of color light sources to form substantially uniform illumination of light of said n colors across said array of attenuating elements.

19. The system of claim 18, wherein said array of filter elements is juxtaposed and in registry with said array of attenuating elements such that each color sub-pixel filter element is able to receive light from one of said attenuating elements.

20. The system of claim 18 comprising driving circuitry adapted to receive said converted image data and to selectively activate said attenuating elements to produce said attenuation pattern.

21. The system of claim 18, wherein said array of attenuating elements comprises an array of Liquid Crystal (LC) elements.

22. The system of claim 18, wherein at least one of said sub-pixel filter elements is able to fully transmit substantially the entire spectrum of at least two of said m wavelength spectra.

23. The system of claim 18, wherein sub-pixel filter elements of two of said n different colors are able to fully transmit substantially the entire spectrum of at least one of said m wavelength spectra.

24. The system of claim 18, wherein sub-pixel filter elements of a first color of said n different colors are able to transmit light of a first, narrow spectrum, and wherein sub-pixel filter elements of a second color of said n different colors are able to transmit light of a second spectrum broader than and including said narrow spectrum.

25. The system of claim 18, wherein each of said plurality of color light sources comprises one or more light emitting diodes.

26. The system of claim 18, wherein at least one of a number of said color light sources, an arrangement of said color light sources, and one or more of said wavelength spectra is selected based on at least one desired display attribute.

27. The system of claim 26, wherein said at least one display attribute comprises at least one attribute selected from the group consisting of a brightness level, a color gamut, and a relative intensity of said colors.

28. The system of claim 26, wherein the arrangement of said color light sources is selected to provide a substantially spatially uniform distribution of illumination of said m spectra produced by said illumination source.