KR100275042B1 - Method and device of auto sensing video signal in a monitor - Google Patents

Abstract

The present invention relates to a device for automatically detecting a video signal in a monitor and a method of detecting the same. In the related art, a signal condition of an input video is not included in the analog / digital conversion unit because the video signal state cannot be checked when an analog video is converted into a digital video. For example, assuming 2.0V to 3.0V, if the video signal output level of the analog signal processor becomes 3.0V or more, the digital video output of the analog / digital converter becomes high and the functions of the digital signal processor are lost. The image is saturated. On the contrary, when the input signal is less than 2.0V, the video signals are all black level, and the video signals die. Therefore, the display of the digital video is not properly performed on the monitor screen.

Accordingly, the present invention is to automatically detect the video signal level when converting the analog signal to digital to automatically process the input video signal according to the characteristics of the monitor while exhibiting a self-diagnostic function to solve the above problems By configuring the video signal automatic detection device and method, the video signal of the monitor can be optimally matched to facilitate the display of the video, and the analog video signal input can be applied to all display media implemented as digital video signals. Regardless of the video card of the computer used by the user, a simple monitor menu operation of the user is used to display a computer video signal that best matches the characteristics of the computer card.

Description

Automatic Image Signal Detection Device on Monitor and Its Detection Method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the detection of video signals in a monitor. In particular, the video signal level is automatically converted when the video signal of an analog computer is converted to digital to automatically process the input video signal according to the characteristics of the monitor while exhibiting a self-diagnosis function. The present invention relates to an automatic image signal detecting device and a method for detecting the same in a monitor for optimally adjusting the signal of the monitor.

As shown in FIG. 1, an image signal processing apparatus of a conventional monitor includes an analog signal processor 1 for adjusting image brightness and contrast of an analog video signal inputted therein, and the image signal by the analog signal processor 1. An analog / digital converter 2 for converting and outputting an analog video signal with contrast adjusted to a digital video signal, and a digital video signal converted and output by the analog digital converter 2 and displayed therein. Digital signal processing section (3) for processing and outputting the video as appropriate to the image, and outputting control signals necessary for each stage after generating adjustment data for adjustment of the analog signal processing section (1) and the digital signal processing section (3). It is composed of a microcomputer (4).

The operation of the video signal processing apparatus in the conventional monitor configured as described above will be described below.

First, when the microcomputer 4 generates the adjustment data for the adjustment of the analog signal processor 1 and the digital signal processor 3, and then outputs and controls the necessary video adjustment signals at each stage of the system, the analog signal processor 1 In this case, after adjusting the image brightness and contrast of the analog video signal input in accordance with the video adjustment signal output from the microcomputer 4, the analog / digital converter 2 outputs the image brightness and contrast.

In addition, the analog / digital converter 2 adjusts the image brightness and contrast to convert the input analog video signal into a digital video signal and outputs it to the digital signal processor 3.

In this case, the digital signal processing unit 3 processes the input digital video signal converted according to the video adjustment signal output from the microcomputer 4 into an image suitable for the display medium 5 and outputs it to the display medium 5. Thus, the display medium 5 can display a digital image.

That is, the digital signal processor 3 displays the entire image according to the input mode of the analog image signal input to the analog signal processor 1 (eg, VGA → XGA), while reducing (eg, SXGA → XGA). The digital video signal corresponding to the medium 5 is outputted.

However, the image signal processing apparatus of the conventional monitor outputs the analog image signal processed by the analog signal processing unit 1 to the analog / digital conversion unit 2 to generate the digital image signal, and then the digital signal processing unit 3 Since the signal processing process is performed, the image signal output level of the analog signal processor 1 is not sensed and is measured through the display medium 5 that is actually displayed.

That is, conventionally, when converting an analog image into a digital image, the video signal state cannot be checked. Therefore, the analog / digital converter 2 assumes that the signal condition of the input image is, for example, 2.0V to 3.0V. When the video signal output level of the analog signal processor 1 becomes 3.0 V or more, the digital video outputs of the analog / digital converter 2 are all high and the functions of the digital signal processor 3 are lost. Is saturated.

On the contrary, when the input signal is 2.0V or less, the video signals are all black level, and the video signals die. Therefore, the display of the images cannot be properly performed on the screen of the monitor.

Accordingly, the present invention automatically detects the video signal level when converting the analog computer signal to digital to automatically process the input video signal according to the characteristics of the monitor while exhibiting a self-diagnosis function to solve such a problem. It is an object of the present invention to configure the automatic detection of the video signal in the monitor and its detection method, so that the display of the video can be made smoothly by optimizing the video signal of the monitor.

The other purpose is to apply analog video signal input to all display media implemented as digital video signal, and the user can easily operate the monitor menu regardless of the computer's video card. It is to be able to display well-matched computer video signal on the monitor.

1 is a block diagram showing the configuration of a video signal processing apparatus in a conventional monitor;

Figure 2 is a block diagram showing the configuration of a video signal automatic detection device in the monitor of the present invention.

Figure 3 is a block diagram showing the internal configuration of the analog signal processing unit in the present invention.

Figure 4 is a block diagram showing the internal configuration of the interface unit in the present invention.

5 is a configuration of the automatic image signal adjustment menu provided in the menu box of the monitor in the present invention.

6 is a flowchart illustrating a method for automatically detecting a video signal in a monitor of the present invention.

7A to 7C are signal waveform diagrams implemented by the present invention.

8A is a signal waveform diagram when a digital output video signal according to an analog input video signal is normal in the present invention.

8B is a signal waveform diagram when the digital output video signal according to the analog input video signal is low in the present invention.

8C is a signal waveform diagram when the digital output video signal according to the analog input video signal is large in the present invention.

Apparatus for automatically detecting a video signal in the monitor of the present invention for achieving the above object as shown in Figures 2 to 5 attached,

In the monitor receiving an analog video signal input from a computer and processed into a digital video signal,

Automatically after generating DC bias voltage through the gain / contrast adjusting unit 11 for adjusting the brightness and contrast of the input analog video signal and the image adjusting signal output controlled from the microcomputer 40. An analog signal processor 10 including a reference voltage output unit 12 for outputting a reference voltage as a component;

Analog / digital conversion for converting and outputting the analog video signal output by adjusting the image brightness and contrast by the analog signal processor 10 to a digital video signal based on the reference voltage output from the reference voltage output unit 11 as a reference. Section 20;

An interface unit 30 for outputting black level data of a computer image signal among the digital image signals converted and output by the analog / digital conversion unit 20;

When the automatic image detection is selected by the user, an enable signal generated through a time delay of a synchronization width or more based on a horizontal synchronization signal is output to the interface unit 30, while the interface unit A microcomputer that detects the current state of the analog video signal input to the analog signal processor 10 through the black level data of the computer video signal output by the computer 30 and outputs and controls the video adjustment signal to automatically adjust its reference level. 40); It is composed of.

In addition, the interface unit 30 is a buffer for outputting black level data of a computer video signal of the digital video signal converted and output by the analog / digital converter 20 according to the enable signal output from the microcomputer 40. Section 31;

A code conversion unit (32) for transcoding the digital black level data output by the buffer unit (31) to the microcomputer (40); The same parts as in FIG. 1 are denoted by the same reference numerals, and description thereof will not be repeated.

Here, the automatic image signal adjustment menu is provided in the menu box of the monitor so that the automatic image detection of the monitor can be made according to a user's selection.

6 is a flowchart showing a method of automatically detecting a video signal in a monitor implemented by an apparatus for automatically detecting a video signal in a monitor according to the present invention.

First, a first step of generating the enable signal through a time delay or more than the synchronization width based on the horizontal synchronization signal input when the user selects the automatic image adjustment mode;

A second step of inputting and transcoding the black level data according to the enable signal generated by the first step, and comparing and determining the magnitude of the coded black level data and the digital video signal;

As a result of the determination in the second step, if the digital signal is larger than the coded black level data, the adjustment signal of the analog signal processor 10 is adjusted downward. If the digital image signal is smaller than the coded black level data, the analog signal processor 10 A third step of upwardly adjusting the adjustment signal;

A fourth step of generating an enable signal through a time delay equal to or greater than a synchronization width based on the horizontal synchronization signal based on the adjustment state of the analog signal processor 10 adjusted by the third step;

A fifth step of inputting and transcoding the black level data according to the enable signal generated by the fourth step, and comparing and determining the magnitude of the coded black level data and the digital video signal;

If the digital signal is greater than or equal to the coded black level data as a result of the determination in step 5, the automatic data adjustment mode of the monitor is terminated by storing the adjustment data, and if the digital signal is not equal to or less than the coded black level data, the analog signal is stored. And a sixth step of continuously checking the video signal black level of the computer in accordance with the horizontal synchronization while adjusting the adjustment signal of the signal processor 10 downwardly or upwardly.

The operation of the automatic image signal detection device and the detection method of the present invention configured as described above will be described with reference to the accompanying FIGS.

First, as shown in FIG. 5, when an analog image signal of a computer is input to the analog signal processor 10 while the user selects the automatic image adjustment mode through the automatic image signal adjustment menu included in the menu box of the monitor, The gain / contrast adjuster 11 included in the analog signal processor 10 adjusts the image brightness and contrast of the input analog video signal and outputs the same to the analog / digital converter 20.

In addition, the reference voltage output unit 12 included in the analog signal processing unit 10 generates a DC bias voltage through an image control signal output from the microcomputer 40 and automatically converts the reference voltage to analog / digital conversion. The analog / digital converter 20 adjusts the image brightness and contrast based on the input reference voltage, thereby converting the output analog video signal into a digital video signal, thereby converting the digital signal into a digital signal processor. While outputting to (3), it is output to the interface unit 30.

Here, when the reference voltage required by the analog / digital converter 20 and the reference voltage output from the reference voltage output unit 12 of the analog signal processor 10 are different, as shown in b and c of FIG. 8. The signal can be lost.

In this case, the interface unit 30 outputs the black level data of the computer image signal of the digital video signal converted and output by the analog / digital conversion unit 20 to the microcomputer 40, wherein the interface unit 30 The buffer unit 31 included in the buffers a computer image signal to be used by the user among the digital image signals converted and output by the analog / digital converter 20 according to the enable signal output from the microcomputer 40. This is output to the code conversion unit 32.

That is, as shown in FIG. 4, the microcomputer 40 generates an enable signal through a time delay greater than or equal to the synchronization width based on a horizontal synchronization signal when the automatic image detection is selected by the user, and then generates the enable signal. 31), the buffer unit 31 buffers the black level data of the computer image signal to be used by the user among the digital image signals according to the enable signal input to the code conversion unit 32. Will be.

After that, the code conversion unit 32 outputs the digital black level data output by the buffer unit 31 to the microcomputer 40 after the code conversion, so that the digital black input by the microcomputer 40 is input. While comparing and analyzing the level data and the digital video signal, the analog signal processor detects the current state of the analog video signal input to the analog signal processor 10 and automatically adjusts the analog video signal to a reference level. Output control is performed at 10).

In other words, the microcomputer 40 adjusts the adjustment signal of the analog signal processor 10 downward when the digital video signal is larger than the coded black level data, and analog signal when the digital video signal is smaller than the coded black level data. The image signal is output to the analog signal processor 10 to adjust the adjustment signal of the processor 10 upward.

On the other hand, according to the adjustment state of the analog signal processing unit 10 adjusted by the above process, when the microcomputer 40 generates the enable signal through a time delay of more than the synchronization width based on the horizontal synchronization signal, the generated enable In response to the signal, the code conversion unit 32 of the interface unit 30 converts the input black level data again and outputs the black level data to the microcomputer 40, so that the microcomputer 40 is code converted and input. The level data and the magnitude of the digital video signal are compared again.

If the digital video signal is equal to or larger than the coded black level data according to the comparison determination result, the microcomputer 40 recognizes that the digital data of the monitor maintains an optimal state and stores the adjustment data to monitor the ruler. The video adjustment mode will be exited.

In addition, if the digital image signal is not equal to or smaller than the coded black level data according to the comparison determination result, the microcomputer 40 adjusts the adjustment signal of the analog signal processor 10 downwardly or upwardly and then adjusts the horizontal synchronization. By continuously checking the video signal black level of the computer in accordance with, the video adjustment signal is continuously output control to the analog signal processor 10 so that the optimum digital data can be produced on the monitor.

For example, if the video signal converted into digital data is black level data (0000 0000), the code converter 32 converts the black level data into an octal code ($ 00) and then outputs it to the microcomputer 40. In addition, the microcomputer 40 recognizes that the analog video signal output from the analog signal processor 10 is the minimum value based on the octal code input.

In addition, if the video signal converted into digital data is the back level data 1111 1111, the code converter 32 converts the back level data into an octal code ($ FF) and outputs it to the microcomputer 40. In this case, the microcomputer 40 recognizes that the analog video signal output from the analog signal processor 10 has a maximum value.

That is, as shown in FIG. 8B, when the input level of the analog video signal is low, the video signal around the black level disappears without being converted to digital. 0000 ".

In addition, as shown in FIG. 8C, when the input level of the analog video signal is high, the video signal around the back level disappears without being converted to digital. 1111 1111 ".

Therefore, according to the analog video signal output of the analog signal processor 10, the microcomputer 40 has a change range from "0000 0000" to "1111 1111" from minimum to maximum based on the reference level as shown in FIG. 8A when the signal is normal. Outputs the video adjustment signal to the analog signal processing unit 10 so that the optimal video signal can be displayed on the monitor screen, which detects when the analog signal is low or high regardless of the output signal state of the video card. The signal adjustment level of the analog signal processor 10 is increased or decreased to create optimal digital data.

As described above, the present invention provides a self-diagnostic function in a monitor that automatically detects an image signal level when converting an analog computer signal to digital to automatically process an input image signal according to the characteristics of the monitor. By configuring the video signal automatic detection device and its detection method, it is possible to smoothly display the video by optimally matching the video signal of the monitor, and can be applied to all display media implemented as digital video signals by receiving analog video signals. At the same time, regardless of the video card of the computer used by the user, the user simply operates the monitor menu to display the computer video signal that best matches the characteristics of the computer card on the monitor.

Claims (4)

In the monitor receiving an analog video signal input from a computer and processed into a digital video signal, The gain / contrast adjustment unit adjusts the brightness and contrast of the input analog video signal, and the reference voltage output unit automatically generates a reference voltage after generating a DC bias voltage through the video control signal output controlled from the microcomputer. An analog signal processor comprising; An analog / digital converter configured to convert an analog image signal output by adjusting the image brightness and contrast by an analog signal processor, and convert the analog image signal into a digital image signal based on the reference voltage output from the reference voltage output unit; An interface unit for outputting black level data of a computer video signal among the digital video signals converted and output by the analog / digital converter; When the automatic image detection is selected by the user, black level data of the computer image signal output from the interface unit is outputted to the interface unit while outputting an enable signal generated through a time delay of a synchronization width or more based on a horizontal synchronization signal. A microcomputer that detects the current state of the analog video signal inputted to the analog signal processor through an output control signal and controls the video adjustment signal to automatically adjust its reference level; Automatic detection of image signal in the monitor, characterized in that consisting of. The digital display device of claim 1, wherein the interface unit comprises: a buffer unit configured to output black level data of a computer image signal among digital image signals converted and output by an analog / digital converter according to an enable signal output from a microcomputer; A code conversion unit for transcoding the digital black level data output by the buffer unit and outputting the digital black level data to a microcomputer; Automatic detection of the image signal in the monitor, characterized in that comprising a. The apparatus of claim 1, wherein an automatic image signal adjustment menu is provided in a menu box of the monitor so that the automatic image detection of the monitor can be performed according to a user's selection. A first step of generating an enable signal through a time delay of a synchronization width or more based on a horizontal synchronization signal input when a user selects an automatic image adjustment mode; A second step of inputting and transcoding the black level data according to the enable signal generated by the first step, and comparing and determining the magnitude of the coded black level data and the digital video signal; If the digital signal is larger than the coded black level data as a result of the determination in the second step, the control signal of the analog signal processor is adjusted downward. If the digital image signal is smaller than the coded black level data, the analog signal processor adjusts the adjustment signal upward. A third step of adjusting; A fourth step of generating an enable signal through a time delay equal to or greater than a synchronization width based on a horizontal synchronization signal based on the adjustment state of the analog signal processor adjusted by the third step; A fifth step of inputting and transcoding the black level data according to the enable signal generated by the fourth step, and comparing and determining the magnitude of the coded black level data and the digital video signal; If the digital signal is greater than or equal to the coded black level data as a result of the determination in step 5, the automatic data adjustment mode of the monitor is terminated by storing the adjustment data, and if the digital signal is not equal to or less than the coded black level data, the analog signal is stored. And a sixth step of continuously checking the black level of the video signal of the computer in accordance with the horizontal synchronization while adjusting the adjustment signal of the signal processor downwardly or upwardly.