Methods and devices for display color compensation
Disclosed are methods and devices for color compensation of a display having a translucent display cover applied to an outside surface of the display. A method may include characterizing a color shift due to the translucent display cover for when there is rendering of an image on the display and compensating for the color shift when rendering an image on the display. The method further may include measuring the color shift induced by the color of the finish, and as described below compensating the red, green, and blue (RGB) levels of the display so that the display image may be presented to the user as originally intended. In this way, the image quality may be substantially optimized for viewing regardless of the lens/cover surface color.
1. A method for color compensation of a display having a translucent display cover applied to an outside surface of the display, the method comprising:
characterizing a color shift due to a translucent display cover for when there is rendering of an image on a display, by determining the color shift due to the translucent display cover from predetermined optical properties of a display cover material, the translucent display cover comprises a display cover material; and
compensating for the color shift when rendering an image on the display.
2. The method of claim 1 , wherein compensating for the color shift when rendering an image on the display comprises:
generating a transformation for color signals to correct for color shift;
analyzing the image into color signals for a plurality of pixels;
applying the transformation to the color signals to generate a color transformed image; and
rendering the color transformed image on the display.
3. The method of claim 2 , wherein the color signals are generated with at least three primary color signals.
4. The method of claim 2 , wherein the transformation comprises:
calculating Gamma curves from measured display output in a plurality of colors;
calculating a color matrix from measured display output in the plurality of colors and from eye response curves in the plurality of colors;
generating a weight factor from an inverse of the color matrix; and
determining, from the weight factor and from the Gamma curves, a Gamma setting profile to correct a white point of the display.
5. The method of claim 2 , wherein the transformation is adjustable via a user interface.
6. The method of claim 1 , wherein characterizing the color shift due to the translucent display cover comprises:
determining the color shift due to the translucent display cover by measurements taken with a color sensor.
7. The method of claim 1 , wherein characterizing the color shift due to the translucent display cover comprises:
loading a precalculated color compensation preset into a display driver.
8. The method of claim 1 , wherein characterizing the color shift due to the translucent display cover comprises:
saving a color compensation preset in a user profile.
9. A method of an electronic device having a display, the method comprising:
characterizing a color shift due to a translucent display cover for when there is rendering of an image on a display, the translucent display cover comprises a display cover material over the display; and
generating a transformation for color signals to correct for color shift;
analyzing the image into color signals for a plurality of pixels;
applying the transformation to the color signals to generate a color transformed image; and
rendering the color transformed image on the display.
10. The method of claim 9 , wherein characterizing the color shift due to the translucent display cover comprises:
downloading a plurality of predetermined color compensation presets into the device; and
selecting from a menu one of the downloaded presets to load into a display driver.
11. The method of claim 9 , wherein characterizing the color shift due to the translucent display cover comprises:
sensing color by a color sensor of the device;
determining the color shift due to the translucent display cover by measurements taken with the color sensor.
12. The method of claim 9 , the display having a front surface, wherein characterizing a color shift due to the translucent display cover comprises:
characterizing a color shift due to a color altering layer adjacent the front surface of the display.
13. The method of claim 12 , further comprising:
downloading a profile including a predetermined color compensation preset; and
compensating a color shift due to the color altering layer, according to the downloadable profile.
14. An electronic device, comprising:
a display having a front surface;
a color altering layer adjacent the front surface of the display;
a display driver coupled to the display; and
a controller coupled to the display driver and configured to:
analyze signals corresponding to an image to be displayed;
compensate for a color shift due to the color altering layer;
generate color compensated signals; and
communicate the color compensated signals to the display driver, wherein a color compensation preset is settable in a profile.
15. The electronic device of claim 14 , wherein the color altering layer is user postponeable.
16. The electronic device of claim 14 , further comprising:
a color sensor coupled to the controller and configured to measure a color shift due to the color altering layer.