KR20040060034A - Monitor self test system - Google Patents

Abstract

PURPOSE: A monitor self test apparatus and method are provided to carry out a self test when a PC monitor displays no image to judge whether the monitor has a problem or a PC has a problem. CONSTITUTION: A monitor self test apparatus includes a microcomputer(25), a test signal output unit(26), and a display(27). The microcomputer generates a test signal for monitor self test and judges whether a monitor has a problem or a PC has a problem from a variation in an automatic beam level in response to the test signal. The test signal output unit outputs the test signal for self test. The display displays a self test result of the microcomputer to a user. The microcomputer applies RGB signals to a pre-amplifier(21) included in the monitor as the test signal.

Description

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

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. (H / V Sync) A monitor self-diagnosis system that automatically determines whether it is a monitor error or a PC error by using the R, G, B signals for self-diagnosis based on the detection result. 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.

Generally, the color of the display LED installed near the power switch on the front of the monitor changes to red or orange when the DPM state is changed, and then turns green when the DPM state is released 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 should check whether the monitor is in the state of DPM, monitor or PC, especially 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.

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

The monitor self-diagnosis apparatus of the present invention for achieving the above object comprises a microcomputer for outputting a test signal for monitor self-diagnosis and determining whether the monitor is defective or PC defective from the change of the ABL level according to the test signal; And a test signal output means for outputting a test signal for self-diagnosis, and a display means for informing a user of the self-diagnosis result of the microcomputer.

In addition, in the monitor self-diagnosis apparatus of the present invention, the microcomputer checks the imageless state of the current monitor as the DPM state or executes a test mode for self-diagnosis according to the ABL level and the presence / absence of horizontal / vertical synchronization signals.

In addition, in the monitor self-diagnosis apparatus of the present invention, the microcomputer applies R, G, and B signals to a preamplifier inside the monitor as test signals.

In addition, the monitor self-diagnostic method of the present invention for achieving the above object, determining whether the current monitor state is a state of no image in the DPM mode, using the test signal when the determination is not the state of the image in the DPM mode And performing a self-diagnosis, determining whether the monitor is defective or a PC defect according to the self-diagnosis result and outputting the corresponding result.

In addition, in the monitor self-diagnosis method of the present invention, determining whether the DPM mode is the step of comparing the ABL level with a predetermined reference value, if the comparison result ABL level is greater than the reference value to determine the presence of horizontal and vertical synchronization signal, the If there is no horizontal and vertical synchronization signal, characterized in that the step of performing the determination in the DPM mode.

In the monitor self-diagnosis method of the present invention, the self-diagnosis includes the steps of: outputting a test signal, checking an ABL level that changes according to the test signal, determining that the monitor is bad when there is no change in the ABL level, In the case where there is an ABL change, a step of determining that the PC is defective is performed.

In addition, in the monitor self-diagnosis method of the present invention, applying the R, G, B signal from the microcomputer to the preamplifier inside the monitor as the test signal and determining that the monitor is defective or the PC is defective according to the changed ABL level. It features.

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 shows an embodiment of a monitor self-diagnosis apparatus of the present invention, which includes a preamplifier 21 for amplifying R, G, and B input signals, and a display drive for the R, G, and B signals amplified by the preamplifier 21. FIG. 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 the steps of: 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 the ABL level of the normal state + 30%, that is, 130% of the ABL level of the normal state, 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 if the R, G, B test signals are applied to the preamplifier 21 through the test signal output unit 26 in the microcomputer 25, and the monitor is defective, since the video circuit of the monitor is abnormal, the test signal is displayed. 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 the OSD 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 (7)

A microcomputer that outputs a test signal for monitor self-diagnosis and determines whether the monitor is defective or a PC defect from a change in the ABL level according to the test signal, and a test signal output means for outputting a test signal for self-diagnosis of the microcomputer; And a display means for informing the user of the self-diagnosis result of the microcomputer. The monitor self-diagnostic apparatus according to claim 1, wherein the microcomputer checks the image-free state of the current monitor as the DPM state or executes a test mode for self-diagnosis according to the ABL level and the presence of the horizontal / vertical synchronization signal. The monitor self-diagnosis apparatus of claim 1, wherein the microcomputer applies R, G, and B signals as test signals to a preamplifier inside the monitor. Determining whether the current monitor state is an imageless state in the DPM mode; if the determination result is not an imageless state in the DPM mode, performing self-diagnosis using a test signal; Or determining whether the PC is defective and outputting a corresponding result. The method of claim 4, wherein the determining of whether the DPM mode is performed comprises: comparing the ABL level with a predetermined reference value, and checking the presence or absence of horizontal and vertical synchronization signals when the comparison result indicates that the ABL level is equal to or greater than the reference value; If there is no, the monitor self-diagnosis method characterized in that the step of performing the determination in the DPM mode. The method of claim 4, wherein the self-diagnosis comprises: outputting a test signal, checking an ABL level changed according to the test signal, determining that the monitor is defective when there is no change in the ABL level, and when there is an ABL change. A monitor self-diagnosis method, comprising performing a step of determining that the PC is defective. [5] The monitor magnet according to claim 4, wherein the test signal is applied to the R, G and B signals from the microcomputer to the preamplifier inside the monitor and is determined as a monitor failure or a PC failure according to the ABL level which is changed accordingly. Diagnostic method.