ANGULARLY DEPENDENT DISPLAY OPTIMIZED FOR MULTIPLE VIEWING ANGLES

• US 20100060667A1
• Filed: 09/10/2008
• Published: 03/11/2010
• Est. Priority Date: 09/10/2008
• Status: Abandoned Application

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: CHEN, Cheng, Yin, Victor Hao-En, Zhong, John Z., Chen, Wei
• Application Number:
  US12/208,290
• Publication Number:
  US 20100060667A1
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G09G 2300/0486 Cholesteric liquid crystals, including chiral-nematic liquid crystals, with transitions between focal conic, planar, and homeotropic states
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• 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 2320/028 by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/068 for control of viewing angle adjustment
• CPC Class Codes: G09G 5/10 Intensity circuits

Abstract

Methods and apparatus for providing optimized gamma settings for each of a plurality of viewing angles and/or device orientations. In certain types of display devices, off-axis viewing leads to contrast degradation and/or color aberrations in a perceived image, as luminance values depend on the angle at which the output is viewed. By remapping grayscale and/or color values to new output voltages, an image can be presented at an optimized luminance level when viewed from any specific angle. In some embodiments, the display device comprises an inclination sensor adapted to sense device rotation about at least one axis. Display parameter optimization logic reads data from the inclination sensor and automatically adjusts the display to an optimized gamma setting.

Claims

1. A method comprising:

determining a plurality of orientation profiles for a display device; and

determining at least one set of parameters adapted to achieve an optimized gamma setting for each orientation profile of the plurality.

2. The method of claim 1, wherein said determining at least one set of parameters comprises mapping grayscale values to driving voltages.

3. The method of claim 2, wherein said mapping grayscale values to driving voltages comprises mapping grayscale values to driving voltages in order to obtain a target luminance function.

4. The method of claim 3, wherein the target luminance function comprises a luminance function that is selectable by a user of the device.

5. The method of claim 2 further comprising detecting the orientation of the device.

6. The method of claim 5, wherein said detecting the orientation of the device comprises detecting the orientation of the device via an inclination sensor.

7. The method of claim 5, wherein said detecting the orientation of the device comprises detecting the orientation of the device via an accelerometer.

8. The method of claim 1, wherein the display device comprises a liquid crystal display.

9. An apparatus comprising:

a first module adapted to determine a set of parameters for obtaining a target gamma setting for each of a plurality of display orientations;

a second module adapted to determine a current display orientation; and

a third module adapted to apply the set of parameters corresponding to the current display orientation.

10. The apparatus of claim 9, wherein the first module is adapted to determine a set of parameters for obtaining a target gamma setting for each of a plurality of display orientations by mapping a set of grayscale values to a set of driving voltages.

11. The apparatus of claim 10, wherein each grayscale value in the set uniquely maps to a driving voltage.

12. The apparatus of claim 9, wherein the first module is further adapted to determine a set of parameters for obtaining a target gamma setting for each of a plurality of display orientations by mapping a set of grayscale values to a set of driving voltages in order to obtain a set of luminance values.

13. The apparatus of claim 12, wherein the set of luminance values is selected based at least in part upon a display orientation and a type of display.

14. The apparatus of claim 13, wherein the type of display is selected from the group consisting of:

twisted nematic, super-twisted nematic, and electrically controlled birefringence.

15. The apparatus of claim 9, wherein the second module comprises an inclination sensor.

16. The apparatus of claim 9, wherein the second module comprises an accelerometer.

17. The apparatus of claim 9, wherein the second module comprises a user interface.

18. The apparatus of claim 17, wherein the user interface is adapted to receive a signal from a user for setting a default display parameter.

19. A computer readable medium storing computer executable instructions which, when executed by a computer, perform a process comprising:

receiving positional data associated with a device comprising a display;

determining an optimized display parameter based at least in part upon the positional data; and

driving the display according to the optimized display parameter.

20. The computer readable medium of claim 19, wherein the positional data comprises an amount of device rotation about at least one axis.

21. The computer readable medium of claim 19, wherein the positional data comprises an angle of view.

22. The computer readable medium of claim 19, wherein the positional data comprises at least one coordinate offset.

23. The computer readable medium of claim 19, wherein said determining an optimized display parameter comprises retrieving data from a lookup table.

24. The computer readable medium of claim 19, wherein said determining an optimized display parameter comprises determining a voltage necessary to yield a target luminance from an input grayscale parameter.

25. The computer readable medium of claim 24, wherein the voltage is adapted to drive at least one liquid crystal molecule disposed within the display.

26. A method comprising:

receiving data comprising a bit value and an orientation of a display; and

determining a voltage based at least in part upon the bit value and the orientation of the display.

27. The method of claim 26, wherein the bit value comprises a grayscale value.

28. The method of claim 26, wherein the bit value comprises a color value.

29. The method of claim 26, wherein the voltage is based at least in part upon a target luminance associated with the orientation of the display.

30. The method of claim 29, wherein a function associated with the orientation of the display comprises the target luminance.

31. The method of claim 30, wherein the function comprises a luminance curve that is optimized for viewing the display from an angle.

32. The method of claim 30, wherein the function is based at least in part upon a luminance curve that is optimized for viewing the display from a normal axis.