公开(公告)号：US4991023A

公开(公告)日：1991-02-05

申请号：US355729

申请日：1989-05-22

Applicant: Gary H. Nicols

Inventor： Gary H. Nicols

IPC: G09G1/04 ,  G09G1/16 ,  G09G1/28 ,  G09G5/00 ,  G09G5/12 ,  G09G5/18

CPC classification number: G09G1/167 ,  G09G2320/08

Abstract: A microprocessor controlled video montior is presented. The video monitor is able to automatically adjust the values of its parameters to adjust to operation on a number of different computer systems. The video monitor includes control lines, digital-to-analog converters and a control processor. The control processor, through the digital-to-analog converters, controls the values of the parameters of the video monitor. Stored in a non-volatile memory are entries which contain values of video monitor parameters. The control processor recognizes different computing systems on the basis of the frequency and polarity of horizontal and vertical synchronization signals. When either frequency or polarity of either the horizontal or vertical synchronization signals changes, the control processor will search the non-volatile memory for an entry in which values stored for both the frequency and polarity of both the horizontal and vertical synchronization signals matches the currently measured frequency and polarity of the horizontal and vertical synchonization signals. If a match is found the values for the parameters stored in the entry are applied by the control processor through the digital-to-analog converters to the control lines. A user may adjust certain parameters through the use of switches which are periodically polled by the control processor. When the control processor receives instructions from a user through manipulation of the switches the control processor makes the specified changes to the video monitor parameters and stores the new values in non-volatile memory.