JP3353820B2 - CRT display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CRT display device and, more particularly, to minute metal particles (suspension) in a tube which cannot be completely eliminated in the production of a cathode ray tube.
Can handle the problem of CRT failure caused by user
And a CRT display device .

[0002]

2. Description of the Related Art Various unexpected minute metal particles (dust) are present in a tube of a CRT during a manufacturing process. When these dusts adhere to the electrodes in the CRT tube, various problems occur. This dust cannot be completely removed, and defects such as focus blur occur during use at a certain fixed ratio. In this case, the user cannot improve the defect and returns to the manufacturer to request repair.

[0003]

The above-mentioned conventional CRT
The first problem with cathode ray tubes is that in the manufacture of CRTs,
CRT failure is caused by the in-tube minute metal particles that cannot be completely eliminated. The reason is that the fine metal particles in the tube adhere to the electrodes in the CRT due to a large vibration / shock applied to the device, and cause a failure in the CRT that has been operating normally until then. To overcome this drawback, the CRT must be subjected to high pressure processing.

[0004] The second problem is that, even in a device which has once been subjected to high pressure treatment, if a large vibration / shock is applied to the device at the time of movement / installation or the like, fine metal particles in the CRT adhere to the electrodes inside the CRT again, That is, the same problem may recur.

[0005] The reason is that the treatment by high-pressure treatment is performed by CRT.
This is because particles adhered to the internal electrodes are burned off by high-pressure treatment by equipment of a manufacturer's factory, and not all fine metal particles existing in the CRT are removed.

An object of the present invention is to provide a CRT display device which enables a user to solve the above-mentioned CRT failure caused by minute metal particles in the CRT without requiring repair by returning to a factory. It is to be.

[0007]

In order to solve the above problems, a CRT display device according to the present invention comprises a control switch
Press to disconnect the CRT from the CRT display circuit.
To generate a high voltage for a predetermined time,
To burn off the fine metal particles, and then
Reconnect the display circuit. Achieve the above objectives
The CRT display device of the present invention
Generates high voltage to burn off minute metal particles attached to the poles
The high-voltage processing circuit that generates
High pressure generation instructing means for instructing life,
CRT display by CRT display according to high pressure generation
Disconnected from the circuit and keep the connection of the high-voltage processing circuit to the CRT.
Holding means and separation means.

[0008] A CRT display device
A high voltage is applied between the CRT electrodes by a high-pressure processing circuit to burn off and remove the fine metal particles attached to the electrodes. By doing so, the CRT defect can be eliminated by the user himself. Even if vibration / shock is applied to the device due to the movement of the device or the like and the fine metal particles adhere to the electrodes in the CRT again, the problem can be easily solved by performing the above processing again.

FIG . 3 is a flowchart of the operation of the CRT display device of the present invention. In this operation, when the user switches on, the CRT display circuit is disconnected from the CRT (step 11), a high voltage is generated for a predetermined time (step 12), and the high voltage is applied to the CRT and adheres to the internal electrodes of the CRT. Burn out the fine metal particles (step 13),
Then, reconnect the CRT display circuit to the CRT
(Step 14) This is the process. An embodiment of the present invention includes a method in which the high voltage is generated by a flyback transformer capable of generating the target voltage.

FIG . 3 is a flowchart of one embodiment of the CRT display device of the present invention. The device switches the CRT display circuit to the CRT
(Step 11) and generate a high voltage for a predetermined time.
(Step 12) The high voltage is applied to the CRT to burn off the fine metal particles attached to the internal electrodes of the CRT (Step 1).
3) Then, reconnect to the CRT display circuit (step 14). This high voltage generation is a flyback transformer capable of generating the target voltage, and is an embodiment of the present invention.

FIG. 1 is a block diagram showing an embodiment of a display device according to the present invention. Referring to FIG. 1, a CRT display device 110 of the present invention includes a CRT 111,
Normal CRT display circuit 112, high-voltage processing circuit 113, control switch 114, and disconnection circuit 115
It is equipped with.

[0012] high-pressure processing circuit 113 is connected to CRT111 and control switch 114. Also, the display
The Ray circuit 112 is connected to the CRT
111. The high-pressure processing on the CRT 111 is performed by a normal display circuit by the disconnection circuit 115.
After cutting 112, the high-pressure processing circuit 113 performs the processing.

When a small metal particle adheres to the internal electrode of the CRT 111 and a CRT failure occurs, a control switch 114 connected to the high-pressure processing circuit 113 is depressed. The circuit 112 is disconnected from the CRT 111, and thereafter, the high-voltage processing circuit 113 operates to apply a high voltage between the electrodes of the CRT 111. With this operation, the CRT 11
The fine metal particles adhering to the first internal electrode are burned off, and the CRT failure is eliminated. If for some reason C
When the RT failure occurs again, the above operation is performed again, so that the CRT failure can be easily eliminated.

[0014]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a block diagram of one embodiment of the CRT display device of the present invention. The CRT display circuit is a flyback transformer (hereinafter, referred to as FBT) mounted inside the CRT display device 210.
213, the CRT 211 and the control switch 214 are connected. The FBT 213 mounted on the CRT display device 210 can generate a voltage several times higher than the voltage during normal use, unlike the flyback transformer mounted on a normal display device.

When the control switch 214 is pressed, the disconnection circuit 215 causes the normal CRT display circuit 2
12 and CRT 211 are separated, and then FBT 21
3, a high voltage is generated for a predetermined time, and the high voltage is
It is applied between the electrodes 211 . With this operation, CRT
The fine metal particles adhering to the internal electrode of 211 are burned off, and thereafter, the separation circuit 215 is restored, and the CRT failure is eliminated. By providing the FBT 213 with such a function, the CRT display device 210 having the same CRT high-pressure processing function as the CRT display device 110 can be provided.

[0017]

As described above, the first effect of the present invention is that a CRT display device has a CR by fine metal particles.
This means that even if a T defect occurs, repair by returning to the factory is unnecessary. The reason is that the CRT display device had to be disassembled at the factory and CRT high-pressure processing had to be performed in the past. Because you can do it.

The second effect is that since it is not necessary to return to the factory, it is possible to expect that the CRT failure due to the attachment of the fine metal particles is unlikely to recur.

The reason is that, when the CRT display device is moved and the vibration / shock is applied to the CRT display device, the fine metal particles tend to adhere to the electrodes inside the CRT. By eliminating the need, the chances of moving the CRT display device are reduced, and as a result, the chances of CRT failure occurring are reduced.

[Brief description of the drawings]

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

FIG. 2 is a block diagram of one embodiment of a CRT display device of the present invention.

FIG. 3 is a flowchart of a CRT user repair method according to an embodiment of the present invention.

[Explanation of symbols]

 110, 210 CRT display device 111, 211 CRT 112, 212 Normal CRT display circuit 113 High voltage processing circuit 213 FBT (flyback transformer) 114, 214 Control switch 115, .215 Separation circuit

Claims (3)

(57) [Claims] In a CRT display device, a high voltage processing circuit for generating a high voltage for burning off fine metal particles attached to an electrode in a cathode ray tube; and a high voltage generation instructing means for instructing the high voltage processing circuit to generate a high voltage. The CRT and the CRT display are instructed by the high pressure generation instructing means.
Separate the spray circuit and connect the CRT with the high voltage processing circuit.
A CRT display device having a disconnection means for holding a connection . 2. The CRT display device according to claim 1, wherein said high-voltage processing circuit is a flyback transformer for generating a dedicated high voltage. 3. The high-pressure processing means includes a separating means.
After confirming the operation, generate a high voltage for a predetermined time and apply it to the CRT.
The CRT display device according to claim 1 or 2, wherein: