JP2002108262A - Crt display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a CRT display device allowing a worker to adjust a beam current by a screen volume adjustment at a manufacturing process without being influenced by the quality and condition of the worker's eyes, and also to provide a CRT allowing the worker to perform the adjustment speedily and exactly even if the worker is not skilled. SOLUTION: This CRT display device 30 is a TV or a monitor comprising at least a CRT 20, a fly-back transformer 10 as a boosting circuit for applying a high voltage to this CRT 20 and a capacitor C2 connected across the positive side of secondary circuit part 12 of the fly-back transformer 10 and the ground GND, a screen adjusting circuit R4 connected across a prescribed position of the secondary circuit part 12 of the fly-back transformer 10, and a display means for detecting a beam current value flowing through the secondary circuit part 12 of the fly-back transformer 10 adjusted by a volume adjustment of the screen adjusting circuit R4, generating a data based on the beam current value, and displaying this data on the CRT 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a CRT display device using a CRT such as a television or a monitor. This CR
The T display device also includes, for example, a composite device combined with a video or the like.

[0002]

2. Description of the Related Art In a conventional CRT display device, when adjusting a beam current by a screen volume in a white balance adjustment step in a production stage, an operator stops a vertical drive and moves a beam on a CRT horizontally. In one,
The position of the screen volume was adjusted to a point where one of the horizontal lines of RGB became slightly visible to the operator's eyes.

[0003]

However, the judgment of whether or not the horizontal line is faint is made based on the subtle reflection of the horizontal line on the CRT. Greatly influenced by In addition, it is greatly affected by the condition of eyes and the degree of eye fatigue of the worker on that day. In addition, it depends greatly on the skill of the worker. That is, if the eyes of the worker are not so good, the condition of the eyes of the worker on the day is not good, or if the worker is not skilled, the beam current varies greatly.

When the variation exceeds a certain range, that is, when the adjustment of the beam current by the screen volume is incomplete, the remaining white balance adjustment performed thereafter cannot be performed.

[0005] That is, the cutoff adjustment at low luminance and the drive adjustment at high luminance by the color analyzer are in an error state in which the adjustment cannot be automatically performed. When such an error state occurs, the operator has to start over from adjusting the screen volume, so that the work time loss required for the entire white balance adjustment is extremely large.

[0006] Incidentally, there is one related to the present invention disclosed in Japanese Patent Application Laid-Open No. Hei 5-176191. However, this publication only discloses a flyback transformer for controlling the focus and the screen volume by electronic adjustment means using a low voltage to improve the efficiency of the adjustment work of the entire television.

A main object of the present invention is to provide a CRT display device capable of adjusting a beam current by adjusting a screen volume in a production stage without being affected by the quality of an operator's eyes or the condition of the eyes of the day. To provide. Another object of the present invention is to provide a CRT display device that can be quickly and accurately performed even if a worker is not skilled.

[0008]

In order to solve the above problems, a CRT display device according to a first aspect of the present invention is a CRT display device.
A booster circuit for applying a high voltage to the CRT; a screen adjustment circuit connected to the booster circuit; and a magnitude of a beam current flowing through the booster circuit adjusted by adjusting the volume of the screen adjustment circuit. And a display means for generating data based on the magnitude of the beam current and displaying the data on the CRT.

According to a second aspect of the present invention, in the CRT display device, the display means includes a voltage conversion means for converting the beam current into a voltage, and a magnitude of the beam current based on a voltage by the voltage conversion means. Is converted into a digital quantity, and a control unit that generates data based on the magnitude of the beam current from the digital quantity, and displays the data based on the magnitude of the beam current generated by the control unit on the CRT. Display means.

According to a third aspect of the present invention, there is provided a CRT display device, wherein the step-up circuit section includes a flyback transformer for generating the high voltage, a positive terminal of a secondary circuit section of the flyback transformer, and GND. And a capacitor connected between them, and configured to output a charge voltage of the capacitor to a video circuit via a resistor, and the resistor is used as the voltage conversion means.

According to a fourth aspect of the present invention, in the CRT display device, the voltage conversion means may include a full-span voltage of a full-span voltage capable of inputting a fluctuation range of a voltage generated between one end of the resistor and GND to the control unit. Means for converting to a fluctuation range were also provided.

According to a fifth aspect of the present invention, there is provided a CRT display device including an OSD circuit, and the display means is also used as the OSD circuit.

In the CRT display device according to claim 6 of the present invention, the data based on the magnitude of the beam current is a decimal number.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A CRT display according to an embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a schematic circuit diagram showing relevant parts of a CRT display device according to an embodiment of the present invention. Note that the beam current represents only one current flow as a representative.

A CRT display device according to an embodiment of the present invention includes a CRT 20, a flyback transformer 10 as a booster circuit for applying a high voltage to the CRT 20, and a secondary circuit 12 of the flyback transformer 10. A capacitor C2 connected between the positive terminal and GND, and a screen adjustment circuit R4 (variable resistance) connected between GND and a predetermined position of the secondary circuit section 12 of the flyback transformer 10 which will be described later. ), And detects the magnitude of the beam current flowing through the secondary circuit section 12 of the flyback transformer 10 adjusted by adjusting the screen volume of the screen adjustment circuit R4, and outputs data based on the magnitude of the beam current. This is a television having at least display means 30 for generating and displaying this data on the CRT 20.

Further, the CRT display device according to the embodiment of the present invention has the
Although it has a horizontal output circuit and the like connected to the secondary circuit section 11, FIG. 1 shows only a transistor Tr1 and a capacitor C2 which are part of the horizontal output circuit. Also, this CR
The T display device has a resistor R2 and a focus circuit R3 (variable resistor) connected between a predetermined position, which will be described later, of the secondary circuit section 12 and the screen adjustment circuit R4, as in the related art. Further, this CRT display device, as in the prior art,
A resistor R1 and a diode D1 are connected in series, and are connected in parallel with the capacitor C2. The charge voltage of the capacitor C2 is supplied to an ACL (AUTO CONTRA
ST LIMITED) circuit and a deflection circuit. The voltage between the point P between the resistor R1 and the diode D1 and GND changes in a range of about -1 to -2 V corresponding to the beam current.

Further, this CRT display device has a microcomputer 50 as a control unit for controlling the whole device, and an OSD circuit 60 connected to the microcomputer 50.

The resistor R1, the microcomputer 50, and the OSD circuit 60 also function as main parts of the display means 30 as described later. Also, this CRT display device has a structure shown in FIG.
Circuits normally provided in the television, such as a tuner, a remote control system circuit, and input keys, which are not shown, are provided in the same manner as in the related art.

The flyback transformer 10 includes a coil L1 as a primary circuit section 11, coils L2, L3, L4 and diodes D2, D3, D4 connected in series as a secondary circuit section 12, as in the prior art. Consists of The cathode of the diode D2, which is the negative terminal of the secondary circuit section 12, is connected to the CRT 20. One end of the coil L4, which is the positive terminal of the secondary circuit section 12, is connected to the negative side of the capacitor C2 and one end of the resistor R1.

The predetermined position of the secondary circuit section 12 of the flyback transformer 10 is a point between the coil L3 and the diode D4.

The display means 30 includes a voltage conversion means 40 for converting the beam current into a voltage, and a voltage conversion means 40.
The microcomputer 5 converts the magnitude of the beam current into a digital quantity based on the voltage generated by the microcomputer, and generates data based on the magnitude of the beam current from the digital quantity.
0, and an OSD circuit 60 as display means for displaying data based on the magnitude of the beam current generated by the microcomputer 50 on the CRT 20.

The voltage converting means 40 has a full-span capable of inputting to the microcomputer 50 the resistor R1 and -1 to -2V, which is a voltage variation range between a point P which is one end of the resistor R1 and GND. There is provided a 0-5V voltage converter 45 as a means for converting the voltage into a voltage range of 0-5V. 0 to
The 5V voltage converter 45 is, for example, an inverting amplification type operational amplifier. The 0 to 5 V voltage converter 45 is connected to the point P and GND.
And amplifies it to a voltage range of 5 to 5 V, which is 0 to 5 V. Since the change state of the beam current is input to the microcomputer 50 in full span,
The microcomputer 50 can detect a subtle change in beam current due to subtle adjustment of the screen volume. That is, the operator can finely adjust the beam current by the screen volume.

The microcomputer 50 has an A / D converter 51, a CPU 52, and a memory 53. The A / D converter 51 converts the voltage from the 0 to 5 V voltage converter 45 into a digital amount. The CPU 52 generates data based on the magnitude of the beam current from the digital amount. The memory 53 stores, in addition to the control program for the entire apparatus, data and the like based on the magnitude of the beam current as needed. Of course, an instruction from an input key (not shown) or a remote controller is input to the microcomputer 50.

When the operator adjusts the screen volume, the output of the 0 to 5 V voltage converter 45 changes in the range of 0 to 5 V corresponding to the beam current. Steps (ie, 0,
(1, 2, 3, 4,..., 254, 255). However, of course, the microcomputer 50
OSD handles and stores data in binary, so OSD
When instructing the circuit 60, the OSD circuit 60 instructs the CRT 20 to display a decimal number.

The OSD circuit 60 has a function of, on the CRT 20, displaying numbers for channel display and display dots such as luminance on the CRT 20 in accordance with an instruction from the microcomputer 50, as in the prior art. The decimal numbers "0" to "255", which are the digital quantities, are on-screened at the channel display positions on the CRT 20 using the function of on-screen displaying the numbers for channel display on the CRT 20.

It is needless to say that the function of displaying data based on the magnitude of the beam current on the CRT 20 works only when the mode is switched to the production adjustment mode as in the conventional case. That is, this function functions only when the service switch or the service chip is switched to the service side, or when a predetermined instruction is given to the microcomputer 50 using an input key or a remote controller.

The CRT display device according to the embodiment of the present invention configured as described above functions as follows in the white balance adjustment step in the production stage. The reference value when the beam current is appropriately adjusted is “0” to “255”.
For example, “128”, “127” or “12”
9 ”is also within the allowable range. Also, “0” to “1”
When "26", the beam current is smaller than the reference value, and when "130" to "255", the beam current is larger than the reference value.

On the CRT display device, when the operator stops the vertical drive and adjusts the screen volume, a number based on the magnitude of the beam current is displayed on the CRT 20. For example, “0” is displayed. Since the value is smaller than the reference value, the operator turns the screen volume toward the direction in which the beam current increases. When the reference value becomes "128", the user stops turning the screen volume. If "130" or more is displayed due to excessive rotation, the screen volume is, of course, turned so as to reduce the beam current so as to be "128". Since the beam current has an appropriate value in the state of "128", the remaining white balance adjustment to be performed thereafter, that is, the cut OF at a low luminance by the color analyzer, is performed.
An error state in which F adjustment and drive adjustment at high luminance cannot be automatically adjusted cannot occur. That is, the beam current adjustment by adjusting the screen volume does not fail, so that the adjustment work is efficient, the production efficiency is improved, and the C
The cost of the RT display device can be reduced.

Further, as in the conventional case, the beam is made a single horizontal line on the CRT, and the position of the screen volume is adjusted to a point where one of the horizontal lines of RGB becomes slightly visible to the operator's eyes. The adjustment can be performed while looking at the numbers "0" to "255" clearly displayed on the CRT 20, so that the adjustment work can be performed without being affected by the quality of the eyes of the worker or the condition of the eyes. I can do it. Further, even if a worker is not skilled, the adjustment work can be performed quickly and accurately.

Note that the CRT display device according to the embodiment of the present invention may be configured as follows instead of the above-described configuration.

(1) Although the voltage at the point P is detected, the voltage between the other end of the resistor R1 and GND may be detected. However, since the potential at the other end is a larger potential on the minus side than the potential at point P, the circuit tends to be more expensive than when the potential at point P is detected.
It is preferable to detect the potential at a point.

(2) The means for converting the voltage into a full-span voltage fluctuation range is used. However, if it is not necessary to capture a subtle change in the beam current at the time of adjusting the beam current by adjusting the screen volume, the voltage can be made smaller than the full-span voltage range. Means for converting into a narrow range may be used. This means may be, for example, an inverting amplification type operational amplifier.

(3) The digital values "0" to "2"
The decimal number “55” is obtained by using the function of on-screen displaying the number for channel display on the CRT 20.
Although the screen is displayed on the channel display position on the RT 20, it is needless to say that the image may be displayed at a position different from the channel display position.

(4) The number displayed is "255"
However, if necessary, it may be "254" or less or "256" or more. Of course, the lower part may be a number other than “0”. Further, the appropriate value (that is, the reference value) may be set to “0”, a negative number may be set when the value is smaller than the reference value, and a positive number may be set when the value is larger than the reference value. .

(5) It is preferable that the data based on the magnitude of the beam current be a decimal number, since it is more familiar from day-to-day use. May be used.

(6) The data based on the magnitude of the beam current may be other than numbers and letters. For example, if a match is found, the word “match” is displayed, but if not, nothing is displayed, or “mismatch”
May be displayed.

Alternatively, only characters such as "OK", "Large", "Large", "Small", and "Very small" may be displayed on the CRT 20.

In this case, the reference value, for example, "128" is stored in advance in the memory 53 of the microcomputer 50, and is compared with the input data from the 0-5V voltage converter 45. Will be displayed according to. As the OSD circuit 60, one in which the above-mentioned characters can be made on-screen is used.

(7) The data based on the magnitude of the beam current may be displayed together with the following characters.
On the CRT 20, characters “beam current level” and data based on the magnitude of the beam current are displayed side by side. Further, in addition to displaying the current value, the target value to be adjusted (that is, the reference value “128”) is also displayed together with the text “target value”.
It may be displayed together with the characters “current value”. In this case, the reference value is stored in the memory 53 of the microcomputer 50.

(8) For example, it may be displayed together with the symbol “↑” for the purpose of raising for adjustment, or the symbol “↓” for the purpose of lowering for adjustment. Also, when trying to raise or lower a lot, the number of “↑” and “↓” may be increased.

(9) The display is preferably digital, but may be analog. For example, a dot type display in which, for example, a rectangular dot displayed for brightness adjustment increases or decreases, or a bar graph or the like increases or decreases is displayed.

(10) CRT according to an embodiment of the present invention
The display device is a television, but it goes without saying that the same applies to a monitor or the like. Note that an OSD circuit is generally provided in a monitor or the like, but if it is not provided, it may be additionally provided as a display means.

[0043]

As described above, according to the first aspect of the present invention,
Is a CRT, a booster circuit for applying a high voltage to the CRT, a screen adjusting circuit connected to the booster circuit, and the booster circuit adjusted by adjusting the volume of the screen adjusting circuit. Display means for detecting the magnitude of the beam current flowing through the section, generating data based on the magnitude of the beam current, and displaying the data on the CRT.

Therefore, in the case of the CRT display device according to the first aspect of the present invention, a display for detecting the magnitude of the beam current, generating data based on the magnitude of the beam current, and displaying the data on the CRT. Since the adjusting means is provided, the adjusting operation can be performed without being affected by the quality of the eyes of the worker or the condition of the eyes. Further, even if a worker is not skilled, the adjustment work can be performed quickly and accurately. Therefore, it is possible to eliminate an error in white balance adjustment. Therefore, the production efficiency is increased, and the cost of the CRT display device is reduced.

According to a second aspect of the present invention, in the CRT display device, the display means includes a voltage converting means for converting the beam current into a voltage, and a magnitude of the beam current based on the voltage by the voltage converting means. Is converted into a digital quantity, and a control unit that generates data based on the magnitude of the beam current from the digital quantity, and displays the data based on the magnitude of the beam current generated by the control unit on the CRT. Display means.

Therefore, in the case of the CRT display device according to the second aspect of the present invention, since the display means has a relatively simple configuration, the cost is hardly increased, the production efficiency is increased, and the total cost is reduced. Cost reduction is possible.

According to a third aspect of the present invention, there is provided a CRT display device, wherein the step-up circuit section includes a flyback transformer for generating the high voltage; And a capacitor connected between them, and configured to output a charge voltage of the capacitor to a video circuit via a resistor, and the resistor is used as the voltage converting means.

Therefore, in the case of the CRT display device according to claim 3 of the present invention, the cost can be reduced because the existing resistor is used.

According to a fourth aspect of the present invention, in the CRT display device, the voltage conversion means may include a full-span voltage of a full-span voltage capable of inputting a fluctuation range of a voltage generated between one end of the resistor and GND to the controller. Means for converting to a fluctuation range were also provided.

Therefore, in the case of the CRT display device according to claim 4 of the present invention, strange adjustment is possible.

According to a fifth aspect of the present invention, there is provided a CRT display device including an OSD circuit, wherein the OSD circuit is used as the display means.

Therefore, in the case of the CRT display device according to claim 5 of the present invention, it can be realized at a relatively low cost by diverting the existing OSD circuit.

In the CRT display device according to claim 6 of the present invention, the data based on the magnitude of the beam current is a decimal number.

Therefore, in the case of the CRT display device according to the sixth aspect of the present invention, since the data based on the magnitude of the beam current is displayed by the decimal numbers which are used to everyday, the user is not skilled. It is possible for an operator to make a judgment at a glance and quickly perform an adjustment operation.

[Brief description of the drawings]

FIG. 1 is a schematic circuit diagram showing relevant parts of a CRT display device according to an embodiment of the present invention.

[Explanation of symbols]

 R1 resistance (part of voltage conversion means) R4 screen adjustment circuit 10 flyback transformer (main part of booster circuit section) 20 CRT 30 display means 40 voltage conversion means 50 microcomputer (control section) 51 A / D converter 52 CPU 53 Memory 60 OSD circuit (display means)

Claims (6)

[Claims] 1. A CRT, a booster circuit unit for applying a high voltage to the CRT, a screen adjustment circuit connected to the booster circuit unit, and a booster circuit unit adjusted by volume adjustment of the screen adjustment circuit. A CRT display device comprising: a display means for detecting the magnitude of a flowing beam current, generating data based on the magnitude of the beam current, and displaying the data on the CRT. 2. A display device comprising: a voltage converter for converting the beam current into a voltage; and a voltage converter for converting the magnitude of the beam current into a digital value based on the voltage by the voltage converter. A control unit for generating data based on the magnitude of the beam current; and display means for displaying data based on the magnitude of the beam current generated by the control unit on the CRT. The CRT display device according to claim 1. 3. The CRT display device according to claim 2, wherein the booster circuit unit includes a flyback transformer that generates the high voltage, and a flyback transformer having a secondary terminal connected to a positive terminal of the secondary circuit unit. A CRT connected between the CRTs and outputting a charge voltage of the capacitors to a video circuit via a resistor, wherein the resistor is used as the voltage conversion means. Display device. 4. The full-span voltage fluctuation range in which the voltage conversion means of the CRT display device according to claim 3 is capable of inputting a fluctuation range of a voltage generated between one end of the resistor and GND to the control unit. A CRT display device characterized by further comprising means for converting to a CRT. 5. The CRT display device according to claim 2, wherein the CRT display device includes an OSD circuit, and wherein the display means also functions as the OSD circuit. 6. The method according to claim 1, wherein the data based on the magnitude of the beam current is a decimal number.
6. The CRT display device according to 2, 3, 4, or 5.