Methods and systems for adjusting color gamut in response to ambient conditions

• US 9,019,253 B2
• Filed: 08/30/2012
• Issued: 04/28/2015
• Est. Priority Date: 08/30/2012
• Status: Expired due to Fees

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Drzaic, Paul Stephen
• Primary Examiner(s): Boddie, William
• Assistant Examiner(s): Gyawali, Bipin
• Application Number:
  US13/599,832
• Publication Number:
  US 20140063039A1
• Time in Patent Office: 971 Days
• Field of Search: None
• US Class Current: 345/207
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 2360/144 the light being ambient light
• 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

Abstract

Systems and methods for adjusting a color space of a display. In one embodiment, the method for adjusting the color space of the display may include receiving image data to be rendered on the display and receiving an indication of an amount of ambient light impinging on the display. The method may then include rendering the image data in a first color space when the amount of ambient light is less than a threshold. Alternatively, the method may include rendering the image data in an expanded color space when the amount of ambient light is not less than the threshold. As such, the expanded color space may compensate for one or more color shifts in the image data caused by the ambient light.

Claims

1. An electronic device, comprising:

a display configured to display one or more images;

a controller configured to adjust a color gamut of the display by;

receiving image data to be rendered on the display, wherein the image data comprises International Commission on Illumination (CIE) Yxy coordinates for each pixel in the image data;

receiving an ambient light measurement that indicates an amount of ambient light impinging on the display;

rendering the image data in a first color space when the ambient light measurement is less than a threshold; and

rendering the image data in an expanded color space when the amount of ambient light is not less than the threshold by;

determining a shift in the Yxy coordinates for each pixel due to the amount of ambient light, wherein the shift in the Yxy variables for each pixel is determined according to;

2. The electronic device of claim 1, wherein the image data rendered in the expanded color space are configured to compensate for a white color component added to the image data by the ambient light.

3. The electronic device of claim 1, wherein the controller is configured to render the image data in the expanded color space by increasing the color saturation levels of each color in the image data.

4. An organic light emitting diode (OLED) display device, comprising:

a controller configured to adjust a color space of the OLED display device based at least in part on an amount of light impinging on the OLED display device by;

receiving International Commission on Illumination (CIE) Yxy variables for each pixel in image data configured to be depicted on the OLED display device;

determining reflected Yxy variables for each pixel in the image data based at least in part on the amount of light impinging on the OLED display device;

determining a shift in the Yxy variables for each pixel due to the respective reflected Yxy variables for each pixel;

determining Yxy compensation variables for each pixel based at least in part on the shift in the Yxy variables for each pixel due to the respective reflected Yxy variables for each pixel, wherein the Yxy compensation variables are determined according to;

5. The OLED display device of claim 4, wherein the shift in the Yxy variables for each pixel is determined according to: