Patent ID: 8850353

Claim:
A method for displaying a document in a viewport display area of a display screen, the viewport being smaller than the document,) the method comprising: displaying on the display screen a first portion of the document in the viewport; in a processor connected for driving the display screen, while the first portion of the document is displayed in the viewport, receiving a user command to initiate a scrolling operation on the document to display a second portion of the document within the viewport; in response to receiving the user command to initiate the scrolling operation, displaying a scrolling reference pattern superimposed on the first portion of the document; performing the scrolling operation to display the second portion of the document within the viewport; and during the scrolling operation, displaying the scrolling reference pattern in a constant position with reference to the document, whereby the scrolling reference pattern moves with the document wherein the scrolling operation is in a direction of scrolling, and the scrolling reference pattern contains only lines in the direction of scrolling.