Beam-Indexed Monitor With Scanback Deflection System
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-28
Disclosed is a method which combines beam-index color video display with scanback deflection in a color CRT, thereby improving the function and practicality of both techniques. In scanback deflection, the beam is used to display video in both directions, and there is no flyback. As shown in the figure, the horizontal deflection is driven by a linear amplifier. The vertical deflection is driven by a digitally controlled linear amplifier, such that it is changed in steps after each line is displayed. The video signal must be presented to the display in the proper order, which is alternately left to right and right to left, on successive lines. With current video buffers this requires additional circuitry to reverse the video order on alternate lines. Alternatively, video buffers can be built to provide this function.