EP-4740201-A1 - ENHANCED COLOR GAMUT FOR ELECTRONIC DISPLAYS

Abstract

An electronic display comprises an array of pixels each comprising first, second, and third primary light-emitting elements that emit primary colors at first, second, and third physical primary color points on a chromaticity diagram, and one or more derivative light-emitting elements that each emit a derivative color at a derivative color point on the chromaticity diagram. The physical primary color points and each derivative color point are located on a boundary of a virtual color space that includes first, second, and third apexes at first, second, and third virtual primary color points on the chromaticity diagram. At least one of the first, second, and third virtual primary color points is different from the first, second, and third physical primary color points, respectively. A color gamut for the pixels is greater than a corresponding gamut for corresponding pixels that are configured to only emit the primary colors.

Inventors

• CARLSON, SHANE STEVEN
• MUELLER, MATTHEW RAY

Assignees

• Daktronics, Inc.

Dates

Publication Date

20260513

Application Date

20240705

Claims (20)

1. 1 . An electronic display comprising: an array of pixels of light-emitting elements, wherein each pixel comprises a first primary light-emitting element configured to emit a first primary color located at a first physical primary color point on a color space chromaticity diagram, a second primary light-emitting element configured to emit a second primary color located at a second physical primary color point on the color space chromaticity diagram, a third primary light-emitting element configured to emit a third primary color located at a third physical primary color point on the color space chromaticity diagram, and one or more derivative light-emitting elements each configured to emit a derivative color each located at a derivative color point on the color space chromaticity diagram; wherein the first physical primary color point, the second physical primary color point, the third physical primary color point, and each derivative color point are located on a boundary of a virtual color space on the color space chromaticity diagram, wherein the boundary of the virtual color space comprises a first apex at a first virtual primary color point on the color space chromaticity diagram, a second apex at a second virtual primary color point on the color space chromaticity diagram, and a third apex at a third virtual primary color point on the color space chromaticity diagram, wherein at least one of the first virtual primary color point, the second virtual primary color point, and the third virtual primary color point is different from the first physical primary color point, from the second physical primary color point, and from the third physical primary color point, respectively; wherein a color gamut that can be produced by the array of pixels is greater than a corresponding gamut for corresponding pixels of corresponding light-emitting elements that are configured to only emit the first primary color, the second primary color, and the third primary color.
2. 2. The electronic display of claim 1 , wherein each derivative color point is proximate to one of the first physical primary color point, the second physical primary color point, and the third physical primary color point on the color space chromaticity diagram.
3. 3. The electronic display of claim 1 or claim 2, wherein the boundary of the virtual color space comprises a first virtual boundary line extending from the first virtual primary color point at the first apex to the second virtual primary color point at the second apex, a second virtual boundary line extending from the second virtual primary color point at the second apex to the third virtual primary color point at the third apex, and a third virtual boundary line extending from the third virtual primary color point at the third apex to the first virtual primary color point at the first apex.
4. 4. The electronic display of claim 3, wherein the boundary of the virtual color space is triangular.
5. 5. The electronic display of claim 4, wherein the boundary of the virtual color space consists of the first apex at the first virtual primary color point, the second apex at the second virtual primary color point, the third apex at the third virtual primary color point, the first virtual boundary line, the second virtual boundary line, and the third virtual boundary line.
6. 6. The electronic display of any one of claims 2-5, wherein the one or more derivative light-emitting elements comprises a first derivative light-emitting element configured to emit a first derivative color located at a first derivative color point on the color space chromaticity diagram
7. 7. The electronic display of claim 6, wherein the first derivative color point is located proximate to the first physical primary color point on the color space chromaticity diagram.
8. 8. The electronic display of claim 6 or claim 7, wherein the first virtual primary color point is spaced from the first physical primary color point and the first derivative color point, the second virtual primary color point is located at the second physical primary color point, and the third virtual primary color point is located at the third physical primary color point.
9. 9. The electronic display of any one of claims 6-9, wherein the one or more derivative light-emitting elements consists of the first derivative light-emitting element configured to emit the first derivative color located at the first derivative color point.
10. 10. The electronic display of claim 6 or claim 7, wherein the one or more derivative light-emitting elements further comprises a second derivative light-emitting element configured to emit a second derivative color located at a second derivative color point on the color space chromaticity diagram.
11. 11 . The electronic display of claim 10, wherein the second derivative color point is located proximate to the second physical primary color point.
12. 12. The electronic display of claim 10 or claim 11 , wherein the first virtual primary color point is spaced from the first physical primary color point and the first derivative color point, the second virtual primary color point is spaced from the second physical primary color point and the second derivative color point, and the third virtual primary color point is located at the third physical primary color point.
13. 13. The electronic display of any one of claims 10-12, wherein the one or more derivative light-emitting elements consists of the first derivative light-emitting element configured to emit the first derivative color located at the first derivative color point and the second derivative light-emitting element configured to emit the second derivative color located at the second derivative color point.
14. 14. The electronic display of claim 11 or claim 12, wherein the one or more derivative light-emitting elements further comprises a third derivative light-emitting element configured to emit a third derivative color located at a third derivative color point on the color space chromaticity diagram.
15. 15. The electronic display of claim 14, wherein the first derivative color point is located proximate to the first physical primary color point, the second derivative color point is located proximate to the second physical primary color point, and the third derivative color point is located proximate to the third physical primary color point.
16. 16. The electronic display of claim 14 or claim 15, wherein the first virtual primary color point is spaced from the first physical primary color point and the first derivative color point, the second virtual primary color point is spaced from the second physical primary color point and the second derivative color point, and the third virtual primary color point is spaced from the third physical primary color point and the third derivative color point.
17. 17. The electronic display of any one of claims 14-16, wherein the first physical primary color point and the second derivative color point are located on the first virtual boundary line, the second physical primary color point and the third derivative color point are located on the second virtual boundary line, and the third physical primary color point and the first derivative color point are located on the third virtual boundary line.
18. 18. The electronic display of any one of claims 14-17, wherein the one or more derivative light-emitting elements consists of the first derivative light-emitting element configured to emit the first derivative color located at the first derivative color point, the second derivative light-emitting element configured to emit the second derivative color located at the second derivative color point, and the third derivative light-emitting element configured to emit the third derivative color located at the third derivative color point.
19. 19. The electronic display according to any one of claims 1-18, further comprising a computer processor configured to convert a color value defined based the first virtual primary color point, the second virtual primary color point, and the third virtual primary color point to corresponding outputs for the first primary light-emitting element, the second primary light-emitting element, the third primary light-emitting element, and each of the one or more derivative light-emitting elements.
20. 20. The electronic display according to any one of claims 1-19, wherein the color space chromaticity diagram is an XYZ chromaticity diagram adopted by International Commission on Illumination in 1931.

Description

ENHANCED COLOR GAMUT FOR ELECTRONIC DISPLAYS CROSS-REFERENCE TO RELATED APPLICTIONS [0001] This application claims the benefit of priority to U.S. Provisional Patent Application Serial No. 63/512,516, filed on July 7, 2023, entitled “ENHANCED COLOR GAMUT FOR ELECTRONIC DISPLAYS,” the disclosure of which is incorporated herein by reference in its entirety. BACKGROUND [0002] Full color electronic information displays have many uses, such as dynamic billboards or scoreboards. Typically, these types of displays use pixels comprising a plurality of “primary” colored light-emitting elements that are combined in various combinations of intensity to produce a variety of colors beyond the primary colors themselves. The combined range of color that the display is capable of producing is typically referred to as the display’s “color gamut,” or simply the “gamut.” [0003] One of the most common primary color combinations used for lightemitting displays comprises a combination of red, green, and blue light-emitting elements, which is typically referred to as an “RGB display.” While RGB displays have a color gamut that includes a large percentage of naturally-occurring colors, the potential color gamut is still limited, with the full gamut available to the display being determined by the specific technology used for the light-emitting elements (with the most common being light-emitting diodes “LEDs”). [0004] It has been found that if the display is included with at least one additional color source, the possible color gamut is increased. For example, in 2010, Sharp introduced its Quattron technology, which added an amber-colored subpixel to the conventional red, green, and blue subpixels to enhance the total color gamut. SUMMARY [0005] The present disclosure describes an electronic display with a color gamut that is enhanced compared to the gamut available from a similarly-situated conventional RGB display. The electronic display comprises pixels that emit three or more primary colors of light, i.e., a first primary color (e.g., red), a second primary color (e.g., blue), and a third primary color (e.g., green). The pixels of the electronic display may also be configured to emit one or more additional colors of light (referred to herein as “derivative colors”) that may each vary from a corresponding primary color by a specified amount (e.g., a red derivative can vary slightly from the red primary, and/or a green derivative can vary slightly from the green primary, and/or a blue derivative can vary slightly from the blue primary). A set of theoretical or virtual primary colors are then determined that correspond to the first, second, and third primary colors, and to the one or more derivative colors. The virtual primary colors can then be used by content providers, which typically define color data in terms of what is to be displayed from a standard RGB pixel. In this way, the electronic display can provide for a color gamut that is larger than that which would be available with only the first, second, and third primary colors alone (e.g., by a conventional RGB display), but that does not complicate the content creation process beyond traditional three-primary color definition, such as RGB. [0006] In an example described herein, an electronic display comprises an array of pixels of light-emitting elements, wherein each pixel comprises a first primary light-emitting element configured to emit a first primary color located at a first physical primary color point on a color space chromaticity diagram, a second primary lightemitting element configured to emit a second primary color located at a second physical primary color point on the color space chromaticity diagram, a third primary lightemitting element configured to emit a third primary color located at a third physical primary color point on the color space chromaticity diagram, and one or more derivative light-emitting elements each configured to emit a derivative color each located at a derivative color point on the color space chromaticity diagram. The first physical primary color point, the second physical primary color point, the third physical primary color point, and each derivative color point are located on a boundary of a virtual color space on the color space chromaticity diagram, wherein the boundary of the virtual color space comprises a first apex at a first virtual primary color point on the color space chromaticity diagram, a second apex at a second virtual primary color point on the color space chromaticity diagram, and a third apex at a third virtual primary color point on the color space chromaticity diagram. At least one of the first virtual primary color point, the second virtual primary color point, and the third virtual primary color point is different from the first physical primary color point, from the second physical primary color point, and from the third physical primary color point, respectively. A color gamut that can be produced by the ar