KR100923201B1 - Monitor self test system - Google Patents

Abstract

The present invention relates to an apparatus and method for automatically diagnosing whether a monitor is defective or a PC is defective when there is no image in a monitor.

According to the present invention, when the monitor is in the state of no image, if the ABL level is higher than the reference value and there is a horizontal / vertical synchronization signal, it is determined as the DPM state. Confirm the change. If there is no change in the ABL level according to the test R, G, B signal output, it is determined that the monitor is bad. If there is a change, it recognizes that there is no video card output and displays the absence of the R, G, B signal. As described above, the present invention can easily recognize whether the monitor or the PC abnormality by notifying the user by diagnosing whether the monitor is defective or the PC defect when the monitor image is not in the state.

Monitor, Imaging, Self Diagnosis

Description

Monitor self test device and self test method {MONITOR SELF TEST SYSTEM}

1 is a flowchart showing a user action process when there is no image in a conventional monitor

2 is a block diagram of a monitor self-diagnosis apparatus of the present invention.

3 is a flowchart of a monitor self-diagnosis method of the present invention.

<Explanation of symbols for the main parts of the drawings>

21: Preamplifier 22: Main Amplifier

23: ABL control unit 24: FBT

25: microcomputer 26: test signal output unit

27: display unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-test device and a self-diagnostic method of a PC monitor, in particular, when the monitor is in an image-free state, an ABL signal level and horizontal and vertical synchronization signals. Based on the result of detecting (H / V Sync), the self-diagnosis test R, G, B signal is used to monitor the self-diagnosis system. will be.

A monitor used in connection with a personal computer (PC) is a very important user interface in a PC environment and a means of delivering various image information to a user. Monitor and PC are connected with various signal cables to transmit R, G, B video signals as well as control signals. Therefore, when the monitor is in use, the signal cable may be pulled out of the connector due to physical interference, and in such a case, the image may not be displayed on the monitor screen, that is, the image may be in a non-image state. In addition, since the monitor also has a system for power saving, when the display is not used for a certain period of time, the monitor enters the power saving mode and the image is not displayed on the monitor screen.

In the former case, when the user recognizes that the cable is missing and corrects the problem, the problem is solved. In the latter case, when the keyboard or the mouse is operated, the user exits the power saving mode and becomes a normal display. However, once the video is in a no state, it is not only difficult and difficult for the user to check whether the current state is the power saving mode or poor signal cable connection, but the monitor is still in the no state even though the above measures are taken. It is impossible to determine whether it is its own defect or PC defect.

Fig. 1 schematically shows the processing sequence of a user when the monitor is in the state of no image. Once the monitor is in the state of no image, the user checks whether the current state is the DPM state (Display Power Management Mode) (S11, S12). In this case, when the user moves the mouse or the keyboard in the DPM state, the DPM state is released, and in the normal case, the image is displayed (S13 and S14a). However, if the image is still in the state despite the release of the DPM state, the user is determined to be a monitor failure (S13, S14b, S15).

Here's a quick look at DPM. DMP is a way to shut down the monitor's high energy consumption circuitry when the display is not in use. This is determined by the period of inactivity from input devices such as modems, mice, keyboards, and the like. Many computers and monitor terminals use technologies such as screen blanking circuitry and screen saver functions. In other words, pressing a key or moving the mouse activates the previous screen again.

Such a power saving function is called a DPM mode (Display Power Management Mode). In the DPM mode, it is determined that the monitor is not used depending on the presence of a vertical or horizontal sync signal (H / V Sync). Depending on whether each input is present or not, it is divided into Suspend / Stand-By mode and off mode.If both vertical and horizontal sync signals are not input to the monitor, it is classified into off mode. It is an operation mode that supplies power only to essential components for standby of microcomputer operation and cuts off power supply to other components, especially heater, deflection IC, etc.

In general, when the DPM state is changed, the color of the display LED installed near the power switch on the front of the monitor turns red or orange, and when the DPM state is released, the color turns green to display the current monitor state to the user. Therefore, as described above, if the front LED does not change when the DPM is released and the video state is continued, it can be judged as a bad monitor, and if the video state continues even though the front LED is changed, in this case, the video card of the PC It may be determined that there is no video signal input from the (Video Card) or the monitor is defective.

Accordingly, if the monitor is in the state of no image, the user may determine whether the monitor is normal or bad according to whether the normal image is displayed after the DPM is released through the above operation.

On the other hand, when the monitor image is not in the DPM state, the user must disconnect the monitor signal cable to check whether the monitor or the PC is bad (S11, S16, S17). When the signal cable of the monitor is disconnected from the PC and still there is no image state, it is determined that the monitor is bad (S18a, S19a). However, if the monitor's signal cable is disconnected from the PC and an OSD (On Screen Display) message is displayed on the monitor screen indicating that the cable is disconnected from the PC, the user may know that the monitor is normal but the video signal from the PC is bad ( S17, S18b, S19b).

This will cause the monitor to detect this if the signal cable is disconnected and display a message on the monitor screen such as 'No R, G, B signal input' or 'Check signal cable connection status'. To take advantage of the functionality.

As described above, when the monitor is in the state of no image, the user must check whether the monitor is in the state of DPM, the monitor is bad, or the PC is bad. In particular, when the monitor is in the state of no image even though it is not in the state of DPM, It was very inconvenient because you had to separate the signal cable and determine whether the monitor was bad or the PC bad according to the result.

In addition, this inconvenience is a big inconvenience for users who are not familiar with the use of the PC, and how to take action is also unfamiliar, so you have to take a lot of anxiety and discomfort when the video is in a stateless state.

SUMMARY OF THE INVENTION An object of the present invention is to provide a monitor self-diagnosis system that performs self-diagnosis on a monitor when the PC monitor is in an image-free state to automatically determine whether the monitor is defective or a PC defect and inform the user of the result. have.

In particular, the present invention receives the ABL level and the horizontal / vertical synchronization signal from the microcomputer and determines whether the monitor is in the DPM state when the PC monitor is in the imageless state, and in the case of the imageless state despite the non-DPM state. The purpose of the present invention is to provide a monitor self-diagnosis system that can monitor and tell the user whether the monitor is defective or PC defective according to the result of checking the ABL level change by outputting G, B test signal.

Monitor self-diagnosis method of the present invention for achieving the above object comprises the steps of determining whether the display power management mode (DPM) in the state of no image; Generating a test signal when it is determined not to be a DPM; Determining whether the automatic beam level is changed by the test signal; And determining that the monitor is defective when there is a change in the ABL level, and outputting a corresponding result by determining that the PC is defective.

In addition, the test signal output unit for outputting the RGB test signal for diagnosing whether the monitor or the PC in a non-image state without the display power management mode (DPM) mode of the present invention; A microcomputer that determines whether there is a change in the Automatic Beam Level (ABL) level in response to the test signal, and determines whether the monitor or the PC is defective according to the change or the fixed state of the ABL level; And display means for displaying defect information according to the determination result of the microcomputer.

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The automatic determination operation of the monitor failure or the PC failure according to the monitor self-diagnosis system of the present invention made as described above will be described below with reference to the accompanying drawings.

2 is a diagram illustrating an embodiment of a monitor self-diagnosis apparatus according to the present invention, which includes a preamplifier 21 for amplifying R, G, and B input signals, and a display driver for amplifying the R, G, and B signals amplified by the preamplifier 21. Controls the main amplifier 22 for amplifying and outputting power for the display, a flyback transformer (FBT) 23 for supplying a driving voltage for the display, and an ABL level supplied to the flyback transformer 23. An ABL control unit 24, a microcomputer 25 for determining whether the monitor is defective or a PC defective by using the ABL level and the ABL level change that changes in response to the test signal, and the R for self-diagnosis in the microcomputer 25. , And a test signal output unit 26 for applying the G and B test signals to the preamplifier 21 and a display unit 27 for outputting the self-diagnosis result of the microcomputer 26. .

3 is an embodiment of the monitor self-diagnosis method of the present invention, the method comprising: detecting an ABL level (S31), comparing the detected ABL level with a reference value Ref (S32), and the detected ABL level is Checking horizontal and vertical synchronizing signals when the reference value is greater than Ref (S33), determining a current monitor state as a DPM mode when there is no horizontal and vertical synchronizing signals (S34), and having the horizontal and vertical synchronizing signals If the microcomputer outputs the R, G, B test signal (S35), checking the change of the ABL level according to the R, G, B test signal (S36), and there is no ABL level change according to the test signal. If it is determined that the current monitor state as a monitor failure (S37), if there is a change in the ABL level according to the test signal, checking the video card R, G, B output absence (S38) and the current monitor state is R, G, Display B-signal free Or less may comprise a step (S39).

2 and 3, the monitor self-diagnosis operation according to the present invention will be described. In the monitor operation, the R, G, and B input signals are amplified by the preamplifier 21 and then amplified by the main amplifier 22 and displayed on the screen as the display is driven. At this time, the microcomputer 25 checks whether the monitor image is in the state of no image which is not displayed on the display unit 27, and when the image is in the state of no image, performs the self-diagnosis operation according to the presence of the ABL level and the synchronization signal and the output of the test signal. do.

When the image of the monitor is not displayed, since the beam level of the monitor CRT does not flow, in this case, the ABL level is increased. Therefore, the microcomputer 25 receives the ABL level from the ABL control unit 24 and compares the level with a predetermined reference value Ref. Here, the reference value Ref may be set to a normal state ABL level + 30%, that is, 130% of the normal state ABL level, and the reference value Ref may be stored inside the microcomputer or with a separate external memory. have.

As a result of comparing the ABL level in the microcomputer 25, when the currently detected ABL level is more than 130% (Ref) of the ABL level in the normal state, the microcomputer 25 recognizes that there is no image and the horizontal and vertical synchronization signals (H / V Sync) Check for the presence of If there is no horizontal and vertical synchronization signal, the microcomputer 25 ignores the abnormal state of the ABL level in this case.

However, when there are horizontal and vertical synchronization signals (H / V Sync), the microcomputer 25 outputs R, G, and B test signals through the test signal output unit 26. The test signal output unit 26 may be configured using a diode to prevent interference between the R, G, B input terminals and the test signal output terminal of the microcomputer 25. That is, the test signal of the microcomputer 25 outputs the test signal while preventing the signal applied from the PC to the R, G, and B input terminals of the monitor being applied only to the preamplifier 21 and not to the test signal output terminal of the microcomputer 25. The diode is connected to the preamplifier 21 through the unit 26.

As described above, when the R, G, and B test signals are applied to the preamplifier 21 through the test signal output unit 26 in the microcomputer 25, when the monitor is normal, the video signal of the monitor is normal. As the display is driven through the amplifier 22, the image is displayed on the screen as R, G, and B images, and thus a change in the ABL level occurs.

However, even when the R, G, B test signals are applied to the preamplifier 21 through the test signal output unit 26 in the microcomputer 25, if the monitor is defective, the test signal is displayed because the video circuit of the monitor is abnormal. In this case, a change in the ABL level does not occur.

That is, the microcomputer 25 outputs R, G, and B test signals, and determines the change of the ABL level accordingly, and if there is no change in the ABL level, the microcomputer 25 determines that the monitor is bad. It is determined to be defective and the user is notified of the absence of the R, G, and B signals (video card failure) through the display unit 27 through the OSD.

In summary, in the present invention, if there is a horizontal or vertical synchronization signal when the ABL level exceeds the reference value, the monitor or the PC is bad, the microcomputer outputs R, G, and B test signals to detect a change in the ABL level accordingly. If there is a change in the ABL level according to the test signal, it knows that the video signal of the PC is bad and displays the video card of the PC by the OSD.If there is no change in the ABL level according to the test signal, the monitor's video amplification circuit is bad, in this case Is not displayed so that the user can easily determine that the monitor is defective.

When the monitor image is not displayed, the monitor self-diagnosis system of the present invention may diagnose the cause of the device and notify a user.

Therefore, if the monitor self-diagnosis system of the present invention is applied, the signal cable between the monitor and the PC can be separated every day to eliminate the trouble of checking whether the monitor is defective or the PC.                     

In addition, the monitor self-diagnosis system of the present invention checks the presence of the ABL level and the synchronization signal, and also diagnoses and determines whether the current monitor or PC is defective or simply DPM. It is convenient because it saves you the trouble of moving your back.

In particular, since the monitor self-diagnosis system of the present invention can tell the user whether the monitor itself is a defective monitor or a PC defect, it is more convenient for users who are unfamiliar with the PC environment, and provides stability and high quality satisfaction in using the device. can do.

Claims (11)

delete delete delete delete delete delete delete Determining whether the display power management mode (DPM) is in the state of no image; Generating a test signal when it is determined not to be a DPM; Determining whether the automatic beam level is changed by the test signal; And determining that the monitor is defective if there is a change in the ABL level, and outputting a corresponding result by determining that the PC is defective. The method of claim 8, wherein the determining of the DPM comprises: comparing an ABL level with a predetermined reference value; Confirming the presence or absence of horizontal and vertical synchronization signals when ABL is greater than or equal to the reference result; If there is no horizontal and vertical synchronization signal, it is determined by the DPM monitor self-diagnostic method. A test signal output unit configured to output an RGB test signal for diagnosing a defect of a monitor or a PC in an imageless state other than a display power management mode (DPM) mode; A microcomputer that determines whether there is a change in the Automatic Beam Level (ABL) level in response to the test signal, and determines that the monitor is defective when the ABL level is changed, or the PC is defective when the ABL level is fixed; And display means for displaying defect information according to the determination result of the microcomputer. The monitor self-diagnosis according to claim 10, wherein the microcomputer determines whether the ABL level is greater than or equal to a reference value, and determines that the microcomputer is in the DPM mode or performs a test mode according to the presence or absence of horizontal and vertical synchronization signals. Device.

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