Circuit and method for indicating image adjustment pattern using OSD

A method for indicating an image adjustment pattern using an on-screen display (OSD), comprising the steps of:

• (a) inputting a key signal for frequency mode conversion;
• (b) generating a free running frequency if there is no external input signal;
• (c) converting the free running frequency generated in step (b) into a standard mode frequency according to the key signal input in step (a);
• (d) controlling steps (b) and (c) according to the presence and absence of the key signal input in step (a) as to selectively output the free running frequency and the standard mode frequency;
• (e) generating an OSD gain signal in accordance with a signal cable check request according to a free running frequency output from step (d);
• (f) generating an OSD gain signal in accordance with an image adjustment pattern according to a standard mode frequency output from step (d);
• and
• (g) receiving the frequency output from step (d), controlling steps (e) and (f), and selectively generating the OSD gain signal according to the cable check request and the OSD gain signal in accordance with image adjustment pattern.

A circuit for indicating an image adjustment pattern using an on-screen display (OSD) comprising:

• microcomputer means for generating a free running frequency in the absence of an externally input signal, and for converting the free running frequency into a standard mode frequency and response to a key signal input, said microcomputer means generating a frequency output and video data;
• OSD control circuit means for receiving frequency output from the microcomputer means and generating an OSD gain signal;
• signal process circuit means for receiving and processing the video data from the microcomputer means, and outputting an video signal;
• and
• video mixer means for mixing the video signal from the signal processing circuit means and OSD gain signal generated by the OSD control circuit means, and outputting a signal for driving a cathode ray tube (CRT).

A circuit for indicating an image adjustment pattern using an on-screen display (OSD) comprising:

• microcomputer means for generating a frequency output and video data;
• OSD control circuit means for receiving the frequency output from the microcomputer means and generating an OSD gain signal in accordance with a signal cable check request, and generating an image adjustment pattern OSD gain signal for indicating the image adjustment pattern according to frequency output;
• signal processing circuit means for receiving and processing the video data according to the frequency output from the microcomputer means, and output a video signal;
• and
• video mixer means for mixing the video signal from the signal processing circuit means and OSD gain signal generating by the OSD control circuit means, and outputting a signal cable check request video signal and an image adjustment pattern video signal.

A method for indicating an image adjustment pattern using an on-screen display (OSD) comprising the steps of:

• inputting a key signal;
• generating a free running frequency if there is no external input signal;
• converting the free running frequency into a standard mode frequency in accordance with the key signal input;
• selectively outputting the free running frequency and the standard mode frequency in accordance with the absence and presence, respectively, of the key signal input.