Patent ID: 6166712
Filing Date: 2000-12-26
Classification: G09G

Abstract:
A display circuit for scrolling information image frames across a display area having a first end and a second end such that message images move across the display area, the first and second ends on opposite ends of the display area, the display circuit comprising:a liquid crystal display element having a persistent display screen including the display area to display the information image frames thereupon, the persistent display screen having an associated image decay rate;a display signal generator coupled to the display element to generate display signals which cause the display element to sequentially display in the display area a plurality of information image frames which are periodically moved a predetermined distance from the first end toward the second end during blank intervals, the display signal generator generating display signals which do not control the display element to display an information image during the blank interval, the blank interval being proportional to the decay rate of the display screen such that each information image fades substantially from the display area before the information image is moved to reduce interference between information image frames; anda liquid crystal display device controller coupled to the display signal generator to receive the display signal generated by the display signal generator and to generate control signals to power at least selected portions of the liquid crystal display element responsive to the display signal.