Automatic brightness control for displays
An automatic brightness adjustment for devices with displays includes the capability to assess ambient light. The assessment may be made using circuitry, such as a light meter circuit, by exploiting exposure control circuitry, or using other approaches. The ambient light value is sent to a brightness adjustment driver, which may employ a look-up table to keep track of brightness adjustments for particular ambient conditions. The look-up table may include distinct adjustment values.
1. An apparatus comprising:
a display; and
a processor coupled to the display, the processor to determine a desired display brightness of the display in response to at least a predetermined eye adaptation to display brightness, a predetermined eye adaptation to environmental brightness, and an ambient light condition, the desired display brightness to avoid conflicts between direct and lateral adaptations of a user, wherein the display is to adjust a display brightness of the display based on the desired display brightness of the display.
2. The apparatus of claim 1 , wherein the eye adaptation to display brightness comprises a direct eye adaptation and the eye adaptation to environmental brightness comprises a lateral eye adaptation.
3. The apparatus of claim 1 , wherein the brightness of the display comprises an average display luminance and the environmental brightness comprises an average environmental luminance.
4. The apparatus of claim 1 , wherein to determine the desired display brightness of the display, the processor is to access a look-up table.
5. The apparatus of claim 4 , wherein the look-up table is to comprise values derived from both the eye adaptation to display brightness and the eye adaptation to environmental brightness.
6. The apparatus of claim 5 , further comprising memory to store the look-up table.
7. The apparatus of claim 1 , further comprising an ambient light sensor to sense the ambient light condition.
8. An article comprising a non-transitory medium storing instructions that, upon execution, cause a processor-based system to:
determine a desired display brightness of a display in response to at least a predetermined eye adaptation to display brightness, a predetermined eye adaptation to environmental brightness, and an ambient light condition, the desired display brightness to avoid conflicts between direct and lateral adaptations of a user; and
adjust a brightness of the display based on the desired display brightness of the display.
9. The article of claim 8 , wherein the eye adaptation to display brightness comprises a direct eye adaptation and the eye adaptation to environmental brightness comprises a lateral eye adaptation.
10. The article of claim 8 , wherein the brightness of the display comprises an average display luminance and the environmental brightness comprises an average environmental luminance.
11. The article of claim 8 , wherein to determine the desired display brightness of the display comprises accessing a look-up table.
12. The article of claim 11 , wherein the look-up table is to comprise values derived from both the eye adaptation to display brightness and the eye adaptation to environmental brightness.
13. A method comprising:
determining, by a processor, a desired display brightness of a display in response to at least a predetermined eye adaptation to display brightness, a predetermined eye adaptation to environmental brightness, and an ambient light condition sensed by an ambient light sensor, the desired display brightness to avoid conflicts between direct and lateral adaptations of a user; and
adjusting a brightness of the display based on the desired display brightness of the display.
14. The method of claim 13 , wherein the eye adaptation to display brightness comprises a direct eye adaptation and the eye adaptation to environmental brightness comprises a lateral eye adaptation.
15. The method of claim 13 , wherein the brightness of the display comprises an average display luminance and the environmental brightness comprises an average environmental luminance.
16. The method of claim 13 , wherein determining the desired display brightness of the display comprises accessing a look-up table.
17. The method of claim 16 , wherein the look-up table is to comprise values derived from both the eye adaptation to display brightness and the eye adaptation to environmental brightness.
18. The method of claim 17 , further comprising storing the look-up table in memory.
19. The method of claim 13 , further comprising sensing the ambient light condition with the ambient light sensor.
20. A system comprising:
a display;
means for determining a desired display brightness of a display in response to at least a predetermined eye adaptation to display brightness, a predetermined eye adaptation to environmental brightness, and an ambient light condition, the desired display brightness to avoid conflicts between direct and lateral adaptations of a user; and
means for adjusting a brightness of the display based on the desired display brightness of the display.
21. The system of claim 20 , wherein the eye adaptation to display brightness comprises a direct eye adaptation and the eye adaptation to environmental brightness comprises a lateral eye adaptation.
22. The system of claim 20 , wherein the brightness of the display comprises an average display luminance and the environmental brightness comprises an average environmental luminance.
23. The system of claim 20 , wherein the means for determining the desired display brightness of the display comprise means for accessing a look-up table.
24. The system of claim 23 , wherein the look-up table is to comprise values derived from both the eye adaptation to display brightness and the eye adaptation to environmental brightness.
25. The system of claim 20 , further comprising:
means for sensing the ambient light condition.