Grayscale and dimming control systems and methods using variable gamma
A display control system includes: a display including a plurality of pixels; a lookup table including grayscale values and magnitudes of power corresponding to the grayscale values, respectively, where first ones of the grayscale values that are less than a predetermined grayscale value are calibrated based on the display achieving a gamma of greater than 2.2 and second ones of the grayscale values that are greater than the predetermined grayscale value are calibrated based on the display achieving a gamma of 2.2; a driver module configured to: based on a grayscale pixel map including a grayscale value for each pixel of the display, determine magnitudes of power to apply to pixels, respectively, using the lookup table; and apply power to the pixels of the display according to the determined magnitudes of power, respectively.
1. A display control system comprising:
a display including a plurality of pixels;
a lookup table including grayscale values and magnitudes of power corresponding to the grayscale values, respectively,
wherein first ones of the grayscale values that are less than a predetermined grayscale value are calibrated based on the display achieving a gamma of greater than 2.2 and second ones of the grayscale values that are greater than the predetermined grayscale value are calibrated based on the display achieving a gamma of 2.2;
a driver module configured to:
based on a grayscale pixel map including a grayscale value for each pixel of the display, determine magnitudes of power to apply to the pixels, respectively, using the lookup table; and
apply power to the pixels of the display according to the determined magnitudes of power, respectively.
2. The display control system of claim 1 further comprising a battery of a vehicle,
wherein the driver module is configured to apply power to the pixels of the display from the battery.
3. The display control system of claim 1 further comprising:
an image source configured to generate an image for display on the display; and
a grayscale module configured to generate the grayscale pixel map based on the image.
4. The display control system of claim 3 wherein the image source includes a camera of a vehicle.
5. The display control system of claim 3 wherein the image is not gamma corrected.
6. The display control system of claim 1 wherein the display is an organic light emitting diode (OLED) display.
7. The display control system of claim 1 wherein the display is a micro light emitting diode (LED) display.
8. The display control system of claim 1 wherein the first ones of the grayscale values of the lookup table decrease from achieving a first predetermined gamma value that is greater than 2.2 decrease toward achieving a gamma of 2.2 as the first ones of the grayscale values approach the predetermined grayscale value.
9. The display control system of claim 8 wherein the first predetermined gamma value is greater than or equal to 2.5.
10. The display control system of claim 8 wherein the first predetermined gamma value is greater than or equal to 2.7.
11. The display control system of claim 8 wherein the first predetermined gamma value is approximately equal to 2.8.
12. The display control system of claim 8 wherein the lookup table is calibrated such that the decrease from achieving the first predetermined gamma value that is greater than 2.2 to the gamma of 2.2 occurs such that each change in luminance between two adjacent ones of the first ones of the grayscale values is less than a predetermined luminance change.
13. The display control system of claim 8 wherein the lookup table is calibrated such that the decrease from achieving the first predetermined gamma value that is greater than 2.2 to the gamma of 2.2 follows an exponential decay function.
14. The display control system of claim 8 wherein the lookup table is calibrated such that the decrease from achieving the first predetermined gamma value that is greater than 2.2 to the gamma of 2.2 follows a natural log decay function.
15. The display control system of claim 8 wherein the lookup table is calibrated such that the decrease from achieving the first predetermined gamma value that is greater than 2.2 to the gamma of 2.2 follows a power 10 log decay function.
16. The display control system of claim 1 wherein:
the display is configured to achieve 256 different grayscale values; and
the lookup table includes less than 256 grayscale values.
17. A display control method, comprising:
based on a grayscale pixel map including a grayscale value for each pixel of a display, determining magnitudes of power to apply to the pixels, respectively, using a lookup table,
wherein the lookup table includes grayscale values and magnitudes of power corresponding to the grayscale values, respectively,
wherein first ones of the grayscale values that are less than a predetermined grayscale value are calibrated based on the display achieving a gamma of greater than 2.2 and second ones of the grayscale values that are greater than the predetermined grayscale value are calibrated based on the display achieving a gamma of 2.2; and
applying power to the pixels of the display according to the determined magnitudes of power, respectively.
18. The display control method of claim 17 wherein applying power to the pixels of the display includes applying power to the pixels of the display from a battery of a vehicle.
19. The display control method of claim 17 further comprising:
generating an image for display on the display; and
generating the grayscale pixel map based on the image.
20. The display control method of claim 17 wherein the lookup table is calibrated such that the decrease from achieving the gamma of greater than 2.2 to the gamma of 2.2 occurs such that each change in luminance between two adjacent ones of the first ones of the grayscale values is less than a predetermined luminance change.