Character Display System for a High Resolution CRT Display
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
In a seal verification device for a banking system using a high resolution CRT for displaying an image pattern such as a seal pattern, several lines of characters, such as alphanumerics in a 5x7 dot matrix, can also be displayed simultaneously with the image pattern on a CRT screen, which is divided into a few areas, as shown in Fig. 1, one for the image pattern and the others for the characters. For displaying the characters large enough for the operator to see easily without using a high resolution character generator, the raster space is expanded only in the character area by controlling the vertical deflection signal in the conventional manner, and the bit transmission rate from a character generator to a CRT video circuit is lowered by controlling the timing clock without modifying the horizontal deflection circuit.