Display device with dynamic color gamut

• US 7,486,304 B2
• Filed: 12/21/2005
• Issued: 02/03/2009
• Est. Priority Date: 12/21/2005
• Status: Expired due to Fees

• Current Assignee: Nokia Corporation
• Original Assignee: Nokia Corporation
• Inventors: Wennstam, Carl, Bergquist, Johan
• Primary Examiner(s): Liang; Regina
• Application Number:
  US11/316,321
• Publication Number:
  US 20070139449A1
• Time in Patent Office: 1,140 Days
• Field of Search: 345/690, 345/691, 345 87- 89, 345/589, 345/590, 345/593
• US Class Current: 345/690
• CPC Class Codes: G09G 2310/0235 Field-sequential colour display
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/066 for control of contrast
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2320/106 Determination of movement vectors or equivalent parameters within the image
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources

Abstract

The specification and drawings present a new method, apparatus and software product for dynamically adjusting a color gamut of a display (e.g., a field sequential color display) and further adjusting a luminance of the display in an electronic device by adjusting and turning on field duties of primary colors. During each color field, the other primary colors of light sources supporting the display can be turned on at their respective fractions of their color field. These fractions can be continuously tunable in order to control the color coordinate of each primary color dynamically thus adjusting the color gamut and the luminance of the display.

Claims

1. A method for dynamically adjusting a display in an electronic device, comprising the steps of:

determining field duties of N primary colors in K color fields using a predefined procedure, wherein N≧

3 and K≧

N; and

determining for each color field of said K color fields further field duties of colors of said N−

1 primary colors not included in said each color field using a predetermined criterion to dynamically control each of said N primary colors, such that said colors with said further field duties can be used in said color fields for dynamically adjusting a color gamut of said display.

2. The method of claim 1, further comprising the step of:

turning on said colors with said further field duties in said each color field.

3. The method of claim 1, wherein said display is a field sequential color display.

5. The method of claim 1, wherein said primary colors are red, green and blue.

6. The method of claim 1, wherein before the step of determining the field duties of the N primary colors, the method comprises the step of:

determining color coordinates of the primary colors of light sources such that these color coordinates can be used for said determining of said further field duties.

7. The method of claim 1, wherein, if a moving image quality is given a priority, the field duties of the N primary colors are assigned a predetermined value.

8. The method of claim 1, wherein the field duties of the N primary colors are determined using a desired white point.

9. The method of claim 1, wherein said further field duties are fractions of said field duties in said each color field.

10. The method of claim 1, further comprising the steps of:

determining a coefficient between zero and one using a further predetermined criterion; and

multiplying said field duties and said further field duties by said coefficient for dynamically adjusting a luminance of said display.

11. The method of claim 1, wherein said colors with said further field duties can be used in said color fields for dynamically adjusting a luminance of said display.

12. A computer program product comprising:

a computer readable storage structure embodying computer program code thereon for execution by a computer processor with said computer program code characterized in that it includes instructions for performing the steps of the method of claim 1 indicated as being performed by any component or a combination of components of the electronic device.

13. The computer program product of claim 12, further comprising the steps of:

determining a coefficient between zero and one using a further predetermined criterion; and

multiplying said field duties and said further field duties by said coefficient for dynamically adjusting a luminance of said display.

4. The method of 1, wherein said display is at least one of:

a liquid crystal display (LCD), a micro-electro-mechanical systems (MEMS) display, a direct-view display, a near-eye display or a projection display.

14. An electronic device with a display, comprising:

a field selector, for defining K color fields for N primary colors, wherein N≧

3 and K≧

N; and

a PWM controller, for determining field duties of said N primary colors in the K color fields using a predefined procedure, for further determining for each color field of said K color fields further field duties of colors of said N primary colors not included in said each color field using a predetermined criterion to dynamically control each of said N primary colors, such that said colors with said further field duties can be used in said color fields for dynamically adjusting a color gamut of said display.

15. The electronic device of claim 14, further comprising:

means for turning on said colors with said further field duties in said each color field.

16. The electronic device of claim 14, wherein said display is a field sequential color display.

18. The electronic device of claim 14, wherein, if a moving image quality is given a priority, the field duties of the N primary colors are assigned a predetermined value.

19. The electronic device of claim 14, wherein the field duties of the N primary colors are determined using a desired white point balance.

20. The electronic device of claim 14, wherein said further field duties are fractions of said field duties in said each color field.

21. The electronic device of claim 14, further comprising:

means for determining a coefficient between zero and one using a further predetermined criterion and multiplying said field duties and said further field duties by said coefficient for dynamically adjusting a luminance of said display.

22. The electronic device of claim 14, wherein said means for determining the coefficient between zero and one is a part of the PWM controller.

23. The electronic device of claim 14, wherein said electronic device is a non-portable electronic device, a television, a computer, a monitor, a wireless communication device, a mobile phone, a camera-phone mobile device or a portable electronic device.

24. The electronic device of claim 14, wherein said colors with said further field duties can be used in said color fields for dynamically adjusting a luminance of said display.

17. The electronic device of 14, wherein said display is at least one of:

a liquid crystal display (LCD), a micro-electro-mechanical systems (MEMS) display, a direct-view display, a near-eye display or a projection display.