Self-diagnosis arrangement for a video display and method of implementing the same

Abstract

A self-diagnostic arrangement for a video display apparatus and method effectuating the same is disclosed. The apparatus according to the present invention includes a cable connector, amplifiers and a cathode ray tube and comprises a microprocessor storing information on a display status, for selectively switching signals to generate horizontal and vertical sync signals for displaying a variety of self-diagnostic displays, an on screen display IC for supplying a blanking signal and a video signal correspondingly responsive to information supplied from the microprocessor and a H / V deflection circuit for supplying on screen display video. signals to the CRT. There is also provided a method of self-diagnosis, which comprises the steps of generating internal horizontal and vertical .[.sync.signals.]. .Iadd.sync signals .Iaddend.of predetermined frequency levels and displaying self-diagnostic screens representing video component colors and a display status.

Description

CROSS REFERENCE TO RELATED APPLICATIONSThis application make reference to, incorporates the same herein, and claims all benefits acruing under 35 U.S.C .sctn.119 from an application entitled A DISPLAY APPARATUS HAVING SELF-DIAGNOSTIC FUNCTION earlier filed in the Korean Industrial Property Office on 22 Oct. 1994 and assigned Ser. No. 27039 / 1994.BACKGROUND OF THE INVENTIONThe present invention relates to an apparatus for a video display, and .[.a.]. more particularly, to a video display apparatus having a self-diagnostic circuit and method of implementing self-diagnosis by utilizing the same.Conventionally, in a video display apparatus such as a monitor for a personal computer system, there is provided a raster arrangement for preventing a user from mistakenly believing a monitor is not operating properly when no raster pattern is displayed on the monitor's screen when no video signal is input during a power-on state. An exemplary apparatus including such arrangement is disclosed in ...

AI Technical Summary

Benefits of technology

It is still another object of the present invention to provide a self-diagnosis arrangement for a video display and method thereof wherein a pictorial image in .Iadd.a .Iadden

Problems solved by technology

In the arrangement of such a conventional type display apparatus however, a raster signal for displaying a raster pattern is limited to only utilizing either a flyback pulse or a RC oscillation circuit, for example, such as one of a bridge type or of a shifted-phase type, thereby displaying a single image pattern on a screen.

A synchronizing signal employed in the apparatus for displaying an image signal on the screen causes a vibration phenomenon when displaying video text, thereby resulting in an incorrect frequency adjustment for the synchronizing signal, for example, an error of approximately 1 KHz for a horizontal synchronizing signal and of approximately more than 3 Hz for a vertical synchronizing signal.

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