Abstract: A system having a display device and a processor connected to the display device to read data from and write data to the display device. The display device, such as a matrix addressable display, communicates directly with a processor via a bus, without the need for an intermediate display memory device such as video random access memory (VRAM) or a graphics controller circuit. Information communicated from the processor to the display device is directly presented in a visual fashion. The processor may read the visual information stored in the display device. The display device is able to retain the visual information without the need for continuous refresh operations. Individual pixels of the display may be selectively written by the processor. Since individual pixels may be selectively written, pixels may be written only when their corresponding values have changed, thereby providing better display update performance.

Abstract: An extender transmits red, blue and green signals, and vertical and horizontal sync signals over a single transmission medium. The extender generates a subcarrier reference frequency signal from the vertical and horizontal sync signals and combines the subcarrier reference frequency signal with the vertical and horizontal sync signals and the green signal to generate a green portion. The extender then quadrature amplitude modulates the blue signal and the red signal by the subcarrier reference frequency signal to generate a color portion, and combines the green portion and the color portion to generate an enhanced video signal. The enhanced video signal is transmitted over the single transmission medium.