JPH0923398A - Plasma display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decide a faulty part without decomposing a device at the time when a PDP doesn't emit light. SOLUTION: A video signal S1 is received by a signal unit 1 and is displayed on a PDP 2. A synchronizing signal S2 or the like from the signal unit 1 is inputted to an integrating circuit 4 to obtain a signal unit signal S3. This signal S3 and an output signal S4 of a power unit 3 are inputted to an exclusive OR circuit 5, and a red LED 6 is lit by the output. When the signal is logical '0', the signal S3 is '0' also, and the LED 6 is not lit because the output of the exclusive OR circuit 5 is '0'. When the signal S4 is '1' and the signal S3 is '1', the LED 6 is not lit because the output of the exclusive OR circuit 5 is '0'. When the signal S4 is '1' and the signal S3 is '0', the LED 6 is lit because exclusive OR between them is '1'. Since the red LED emits light when power is supplied and the synchronizing signal is not outputted from the signal unit, the fault of the signal unit is immediately detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device for displaying a television image or the like and capable of easily determining an obstacle portion.

[0002]

2. Description of the Related Art PD in a conventional plasma display device
When P (plasma display panel) does not emit light, the power supply unit of the plasma display device, the PDP
Failure of each single unit and signal processing unit is possible,
Moreover, since the symptoms on the screen are the same, there is a problem that it is not possible to determine which of the faults has occurred unless the entire device is disassembled and each part is checked.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a technique capable of determining a faulty part without disassembling the device when the PDP does not emit light.

[0004]

A sync signal detecting means for converting a signal generated from a sync signal such as a video signal sync signal or a blanking signal into a direct current level signal to indicate whether or not a sync signal is output, A determination unit that outputs a logic 1 when there is a power supply voltage and there is no synchronization signal and the like, and a display unit that displays the determination result are provided, and the display unit displays that there is a power supply voltage and there is no synchronization signal or the like. indicate.

The means for determining the presence / absence of the output of the synchronizing signal or the like is an integrating circuit for smoothing the synchronizing signal or the blanking signal into a DC level signal.

The means for determining the presence / absence of the output of the sync signal or the like is a retriggerable monostable multivibrator which is triggered by the sync signal or the blanking signal.

The determining means for outputting a logic 1 when the power supply voltage is present and there is no synchronizing signal or the like is an exclusive logical sum circuit of the power supply voltage and the output signal for determining the presence or absence of the synchronizing signal or the like.

The determination means for outputting a logic 1 when there is a power supply voltage and there is no synchronization signal or the like is a circuit that takes the logical product of the power supply voltage and the negative signal of the determination output signal for the presence or absence of a synchronization signal or the like.

The means for displaying the determination result that there is a power supply voltage and there is no synchronizing signal is a red light emitting LED.

[0010]

A synchronizing signal detecting means for converting a signal generated from a synchronizing signal of a video signal or a synchronizing signal such as a blanking signal into a DC level signal and indicating whether or not a synchronizing signal is output, and a power supply voltage are provided. By providing a judgment means for outputting a logic 1 when there is no synchronization signal and the like and a display means for displaying the judgment result and displaying on the display means that there is a power supply voltage and no synchronization signal or the like, the device It can be seen that there is a failure in the video signal processing unit without disassembling the whole.

The means for determining the presence / absence of the output of the synchronizing signal or the like is an integrating circuit for smoothing the synchronizing signal or the blanking signal into a direct current level signal to output the presence / absence of the outputting of the synchronizing signal or the like with a simple configuration. It is possible to obtain a judgment means for doing so.

The deciding means for deciding the presence or absence of the output of the synchronizing signal or the like is a retriggerable monostable multivibrator which is triggered by the synchronizing signal or the blanking signal so as to decide the presence or absence of the outputting of the synchronizing signal or the like digitally. Is obtained.

The determination means that outputs a logic 1 when there is a power supply voltage and there is no synchronization signal, etc., is surely the same by using an exclusive logic sum circuit of the power supply voltage and the output signal for determining the presence or absence of the synchronization signal, etc. A judgment signal is obtained.

When the power supply voltage is present and there is no synchronization signal or the like, the determination means for outputting a logic 1 is a circuit that takes the logical product of the power supply voltage and the negative signal of the determination output signal for the presence or absence of the synchronization signal or the like. . Another circuit configuration of the determination means is possible.

By using a red light emitting LED as the means for displaying the result of determination that the power supply voltage is present and there is no synchronizing signal or the like, the failure of the signal unit can be easily identified.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a plasma display device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram of an embodiment of a plasma display device according to the present invention. The signal unit 1 receives the video signal S1 from the television or the like and performs signal processing so that the same video can be displayed on the PDP 2. The output signal is transmitted to PDP2 and PD
The image is displayed on the display screen of P2. A power supply voltage is supplied from the power supply unit 3 to the signal unit 1 and the PDP 2. The synchronizing signal or blanking signal S2 generated in the signal unit 1 is input to the integrating circuit 4 and smoothed to obtain a voltage level signal indicating the presence or absence of the synchronizing signal, that is, a signal unit signal S3 indicating the operation of the signal unit. . The signal unit signal S3 and the power supply unit signal S4 indicating the presence or absence of the output voltage of the power supply unit 3 are input to the exclusive logic circuit 5, and the red LED 6 is turned on by the output. Since the signal unit does not operate when the power supply unit signal is logic 0, the signal unit signal also becomes logic 0 and the output of the exclusive OR circuit 5 becomes 0.
The LED 6 does not light up. Further, even when the power is supplied and the signal unit is operating normally, both the signal unit signal S3 and the power unit signal S4 become the logical value 1, the exclusive OR output becomes 0, and the LED does not light. When the power is supplied and the power supply unit signal S4 is logic 1 and a synchronizing signal or the like is not output from the signal unit, the signal unit signal S3 becomes logic 0 and the exclusive logical sum of these is 1 and the LED 6 lights up. Therefore, the red LED emits light when the synchronizing signal or the like is not output from the signal unit although the power is supplied, so that the failure of the signal unit can be immediately recognized.

FIG. 2 is a block diagram of another embodiment of the plasma display device according to the present invention. The signal unit 21 receives the video signal S21 from the television or the like, and receives the PDP.
Signal processing is performed so that the same image can be displayed on 22. The output signal is transmitted to the PDP 22 and an image is displayed on the display screen of the PDP 22. A power supply voltage is supplied from the power supply unit 23 to the signal unit 21 and the PDP 22. The sync signal or blanking signal S22 generated in the signal unit 21 is input to the trigger terminal of the retriggerable monostable multivibrator 24 having a holding time slightly longer than the cycle of the sync signal or the like, and the signal unit outputs from its negative output. The negative signal unit signal S23 indicating the negative of the signal indicating the operation of is obtained. This negative signal unit signal S2
3 and the power supply unit signal S24 indicating the presence / absence of the output voltage of the power supply unit 23 are input to the logical product circuit 25, and the red LED 26 is turned on by the output. When the power supply unit signal is logic 0, the output of the AND circuit 25 becomes 0 and the LED 26 does not light. Further, even when power is supplied and the signal unit is normally operating, the negative signal unit signal S23 becomes a logical value 0, the logical product output becomes 0, and the LED does not light. When the power is supplied and the power supply unit signal S24 is logic 1 and the synchronizing signal or the like from the signal unit is not output, the negative signal unit signal S23 becomes logic 1 and the logical product of these is 1 and the LED 26 lights up. Therefore, the red LED emits light when the synchronizing signal or the like is not output from the signal unit although the power is supplied, so that the failure of the signal unit can be immediately recognized.

[0018]

As described above, in a plasma display device for displaying an image using a PDP (plasma display panel), the synchronizing signal of the image signal is converted into a direct current level signal to output the synchronizing signal. Power is supplied by setting the signal indicating presence / absence and outputting a logical 1 from the same signal and a signal indicating the presence / absence of a power supply voltage when there is a power supply voltage and no synchronization signal, etc., and displaying this on an LED or the like. Since it is immediately known that the synchronization signal or the like is not output even if it is performed, it is possible to determine the unit in failure without disassembling the device.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a plasma display device according to the present invention.

FIG. 2 is a block diagram of another embodiment of the plasma display device according to the present invention.

[Explanation of symbols]

1 signal unit 2 PDP 3 power supply unit 4 integrating circuit 5 exclusive OR circuit 6 LED S1 video signal S2 synchronizing signal etc. S3 signal unit signal S4 power supply unit signal 21 signal unit 22 PDP 23 power supply unit 24 retriggerable monostable multivibrator 25 logic Product circuit 26 LED S21 Video signal S22 Synchronization signal, etc. S23 Negative signal Unit signal S24 Power supply unit signal

Claims (6)

[Claims] 1. PDP (Plasma Display Panel)
In a plasma display device for displaying an image by using, a synchronization signal indicating whether or not a synchronization signal of a video signal or a signal generated from the synchronization signal such as a blanking signal is converted into a DC level signal to output the synchronization signal or the like. A signal etc. detecting means, a judging means for outputting a logic 1 when there is a power supply voltage and there is no synchronizing signal etc., and a display means for displaying the judgment result are provided, and there is a power supply voltage and a synchronizing signal etc. A plasma display device characterized by displaying the absence on the display means. 2. A means for determining whether or not a synchronization signal or the like is output,
2. The plasma display device according to claim 1, wherein the integrating circuit is configured to smooth the synchronizing signal or the blanking signal into a DC level signal. 3. A means for determining whether or not a synchronization signal or the like is output,
The plasma display device according to claim 1, wherein the plasma display device is a retriggerable monostable multivibrator that is triggered by the synchronizing signal or blanking signal. 4. The determination means for outputting a logic 1 when there is a power supply voltage and there is no synchronization signal or the like is an exclusive logic sum circuit of the power supply voltage and an output signal for determining the presence or absence of the synchronization signal or the like. 4. The plasma display device according to claim 1, claim 2 or claim 3. 5. The determination means that outputs a logic 1 when there is a power supply voltage and there is no synchronization signal or the like is a circuit that takes the ethical product of the power supply voltage and the negative signal of the output signal for determining the presence or absence of the synchronization signal or the like. The plasma display device according to claim 1, 2 or 3, wherein 6. The red-light-emitting LED is used as the means for displaying the determination result indicating that there is a power supply voltage and there is no synchronization signal or the like, as claimed in claim 1, claim 2, claim 3, and claim 3. The plasma display device according to claim 4 or claim 5.