Device, system and method for color display

• US 7,995,019 B2
• Filed: 08/02/2007
• Issued: 08/09/2011
• 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: Ben-Chorin, Moshe, Ben-David, Ilan, Roth, Shmuel
• Primary Examiner(s): Patel; Nitin
• Application Number:
  US11/882,491
• Publication Number:
  US 20080024410A1
• Time in Patent Office: 1,468 Days
• Field of Search: 345 87-102, 345/204
• US Class Current: 345/88
• CPC Class Codes: G02B 5/201 in the form of arrays
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134345 Subdivided pixels, e.g. for grey scale or redundancy
• 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

A color Liquid Crystal Display (LCD) device for displaying a color image using at least four different primary colors, the device including an array of Liquid Crystal (LC) elements, driving circuitry adapted to receive an input corresponding to the color image and to selectively activate the LC elements of the LC array to produce an attenuation pattern corresponding to a gray-level representation or the color image, and an array of color sub-pixel filter elements juxtaposed and in registry with the array of LC elements such that each color sub-pixel filter element is in registry with one of the LC elements, wherein the array of color sub-pixel filter elements comprises at least four types of color sub-pixel filter elements, which transmit light of the at least four primary colors, respectively.

Claims

1. A color Liquid Crystal Display (LCD) device for displaying a color image using at least five different colors, the device comprising:

an array of Liquid Crystal (LC) elements;

driving circuitry adapted to receive an input corresponding to said color image and to selectively activate the LC elements of said LC array to produce an attenuation pattern corresponding to a gray-level representation of said color image;

a back illumination source to generate light; and

an array of color sub-pixel filter elements to filter the light generated by said back illumination source, said array of color sub-pixel filter elements being juxtaposed and in registry with said array of LC elements such that each color sub-pixel filter element is in registry with one of said LC elements,

wherein said array of color sub-pixel filter elements comprises at least five different colored sub-pixel filter elements, which transmit light of said at least five different colors, respectively, wherein the light transmitted through each of said sub-pixel filter elements is independent of the other sub-pixel filter elements, and

wherein the color gamut of the LCD device is wider than the color gamut of a standard RGB display.

2. A device according to claim 1, wherein said at least five colors comprise red, green, blue, and yellow.

3. A device according to claim 2 wherein said at least five colors further comprise cyan.

4. A device according to claim 1 wherein said device displays said color image using at least six different colors, and wherein said types of color sub-pixel filter elements comprise at least six types of color sub-pixel filter elements, which transmit light of said at least six colors, respectively.

5. A device according to claim 4 wherein said at least six colors comprise red, green, blue, yellow and cyan.

6. A device according to claim 5 wherein said at least six colors further comprise magenta.

7. A device according to claim 1, wherein the wavelength ranges of said at least four colors are selected to provide an optimal over-all brightness.

8. A device according to claim 1, wherein the wavelength ranges of said at least four colors are selected to provide an optimal color gamut width of the displayed images.

9. A device according to claim 1, comprising a controller to receive data representing said color image in terms of three data components, and to provide said driving circuitry with said input representing said color image in terms of said at least four colors.

10. A device according to claim 1, wherein the color gamut of the LCD device includes the entire color gamut of said standard RGB display.

11. A device according to claim 1, wherein the color gamut of the LCD device is wider than NTSC standard color gamut.

12. A device according to claim 3 wherein each of said red, green and blue filter elements has narrower transmission bandwidth than each of said yellow and cyan filter elements.

13. The device according to claim 2, wherein each of the five different colored sub-pixel filter elements has a transmission bandwidth independent of the other four sub-pixel filter elements.

14. The device according to claim 1, wherein each sub-pixel element is adjacent on a first axis to two different colored sub-pixels, and wherein each sub-filter element is adjacent on a second axis orthogonal to said first axis to two sub-pixels each having the same color as said sub-pixel element.

15. The device according to claim 1, wherein each row contains repetitions of said at least four sub-pixels, and wherein each row is a shifted copy of an adjacent row.

16. The device according to claim 1, wherein each sub-pixel has aspect ratio of 1:

3, thereby resulting in three adjacent sub-pixels having an aspect ratio of substantially 1;

1.