Display system for localizing regions in a mixed text and picture display
First Claim
1. A system for localizing a region of a display device for displaying a mixed text-picture with two brightness levels comprising means for scanning the region to be localized, means for generating a signal representative of an open frame formed by at least two non-parallel lines, means for moving the position of said cursor in two dimensions in the picture of said display device, means for mixing said cursor signal with picture information, means including a data input for controlling the size of said cursor by controlling the length of said lines, whereby the size of said cursor can be modified by modifying said data input, and means for periodically changing the data input for progressively reducing the size of said cursor.
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Accused Products
Abstract
A system for localizing a region of a display incorporates a plurality of resettable counters for defining the position and extent of a cursor in two dimensions, such cursor comprising at least two non-parallel lines defining an open frame. Data is set into the counters periodically at the beginning of each frame, or at the beginning of each scanning line, so that the size and shape of the cursor is selectable, as well as its position on the display. When the data is modified during successive time periods, the cursor can be made to progressively reduce its size so as to indicate a point, and/or to progressively change its location.
25 Citations
17 Claims
- 1. A system for localizing a region of a display device for displaying a mixed text-picture with two brightness levels comprising means for scanning the region to be localized, means for generating a signal representative of an open frame formed by at least two non-parallel lines, means for moving the position of said cursor in two dimensions in the picture of said display device, means for mixing said cursor signal with picture information, means including a data input for controlling the size of said cursor by controlling the length of said lines, whereby the size of said cursor can be modified by modifying said data input, and means for periodically changing the data input for progressively reducing the size of said cursor.
- 11. A method of locating regions on a display screen comprising the steps of generating a cursor in the form of two or more non-parallel lines, positioning said cursor at a location anywhere on said display screen, presenting data to a data input for controlling the length of said lines, whereby the size and shape of said cursor can be modified by modifying said data input, and periodically changing the data input to progressively alter the size of said cursor.
Specification