Ex parte HOFFMAN et al. - Page 2

          Appeal No. 1997-0384                                                        
          Application 08/086,498                                                      

          display circuit and display signal generator used in                        
          controlling the scrolling of characters across a display                    
          screen.  Scrolling is effected by first displaying a character              
          in a given location, followed by a "blanking" period where the              
          character is blanked at the given location for a length of                  
          time, and lastly a different character is displayed at the                  
          same given location.  In this manner a word, symbol, or number              
          can be moved across an LCD screen.  As indicated in the                     
          specification (pages 2 and 4), appellants recognized that                   
          prior art LCD’s suffered from difficulties in scrolling such                
          as interference between sequentially generated characters                   
          which are being displayed on a display device (see                          
          specification, page 4).  Appellants have recognized that such               
          "runover" or "interference" degrades image quality of scrolled              
          images on the display (see specification, page 4).  To                      
          overcome this problem, appellants provide a display signal                  
          generator to perform a blanking operation for a time interval               
          proportional to the decay rate of the display screen, thereby               
          overcoming the problem in the prior art of interference                     
          between sequential characters which are displayed in the same               
          image frame during a scrolling operation.                                   

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