Light sensitive display

1. A display comprising:

a stack of layers configured to display an image;

a memory maintaining material configured to maintain a path caused by an object in contact with the display; and

multiple elements included in the stack of layers, wherein each of the multiple elements is configured to sense light passing through or reflected off the memory maintaining material.

2. The display of claim 1 , wherein the memory maintaining material is configured to change an optical property associated with the memory maintaining material in response to an object pressing against the memory maintaining material.

3. The display of claim 2 , wherein the memory maintaining material comprises a pair of flexible layers enclosing a fluid, wherein the fluid is configured to be displaced in response to an object pressing against the memory maintaining material.

4. The display of claim 1 , wherein the memory maintaining material is configured to change an optical property associated with the memory maintaining material in response to an object emitting light at the memory maintaining material.

5. The display of claim 1 , wherein the display is configured to capture the path based on output from the multiple elements.

6. The display of claim 5 , wherein the display is configured to capture the path after receiving an indication that the path is completed.

7. The display of claim 6 , wherein the indication is based on a button press.

8. The display of claim 6 , wherein the indication is based on an input at a portion of the display other than a portion associated with the memory maintaining material.

9. The display of claim 5 , wherein the display is configured to capture the path while the object moves along the memory maintaining material.

10. The display of claim 5 , wherein the memory maintaining material is configured to provide visual feedback of the path.

11. The display of claim 5 , wherein the path corresponds to a signature.

12. A system comprising:

a stack of layers configured to display an image on a display;

a memory maintaining material configured to maintain a path caused by an object in contact with the display; and

multiple elements included in the stack of layers, wherein each of the multiple elements is configured to sense light passing through or reflected off the memory maintaining material,

wherein the system is configured to capture an image of the path based on output from the multiple elements.

13. The system of claim 12 , wherein the system is configured to capture the image of the path when operating in a first mode, and the system is configured to determine a location of an object based on output from the multiple elements when operating in a second mode.

14. The system of claim 13 , wherein the stack of layers further comprises multiple elements that are configured to sense light and are associated with a portion of the display other than a portion associated with the memory maintaining material.

15. The system of claim 13 , wherein the first mode corresponds to a signature mode and the path corresponds to a signature.

16. The system of claim 13 , wherein the system, when operating in the second mode, is configured to determine the location of the object based on output from the multiple elements captured over a single frame.

17. The system of claim 13 , wherein the system, when operating in the second mode, is configured to determine the location of the object based on averaged output from the multiple elements captured over consecutive frames.

18. The system of claim 13 , wherein the system, when operating in the first mode, is configured to capture the image of the path based on output from the multiple elements captured over several frames.

19. The system of claim 12 , wherein the system is configured to capture the image of the path based on output from the multiple elements indicating a region of sensed light intensity below a threshold level of sensed light intensity.

20. The system of claim 13 , wherein the system is configured to determine the location of the object based on output from the multiple elements indicating a region of sensed light intensity below a threshold level of sensed light intensity.

21. The system of claim 13 , wherein the system is configured to determine the location of the object based on output from the multiple elements indicating a region of sensed light intensity above a threshold level of sensed light intensity.