Gps device and method for reducing light emitted by display

Abstract

The present invention provides a method for converting display of information on a GPS device between a first display mode and a second display mode by “negativizing” pixels or other image elements, wherein negativizing entails converting lighter image elements to darker image elements and converting darker image elements to lighter image elements so as to result in reduced total emission of light.

1 . A method of reducing light emitted by a GPS device, the method comprising:
 a) receiving an input corresponding to a user's selection of a second display mode;   b) converting display information to the second display mode, wherein the second display mode emits less light than a first display mode; and   c) displaying the display information.   
   
   
       2 . The method according to  claim 1 , further comprising providing a dedicated selection device, a single actuation of which generates the input corresponding to the user's selection. 
   
   
       3 . The method according to  claim 1 , wherein the display information is converted to the second display mode by negativizing a plurality of image elements corresponding to the display information. 
   
   
       4 . The method according to  claim 1 , wherein the display information is converted to the second display mode by converting at least a portion of a plurality of image elements to a darker color. 
   
   
       5 . The method according to  claim 1 , wherein the display information is converted to the second display mode by converting at least a portion of a plurality of image elements to a darker shade. 
   
   
       6 . The method according to  claim 1 , wherein the display information is displayed in gray scale and wherein the display information is converted to the second display mode by converting any white image elements to black image elements, any black image elements to white image elements, any lighter gray image elements to darker gray image elements, and any darker gray image elements to lighter gray image elements. 
   
   
       7 . A method of reducing emitted light associated with displaying information on a GPS device, the method comprising:
 a) receiving an input corresponding to a user's selected of a second display mode, wherein the second display mode emits less light than a first display mode;   b) converting display information to the second display mode by converting at least a portion of any lighter image elements to darker image elements and at least a portion of any darker image elements to lighter image elements; and   c) displaying the display information in the selected second display mode.   
   
   
       8 . The method according to  claim 7 , further comprising providing a dedicated selection device, a single actuation of which generates the input corresponding to the user's selection.