JP3360840B2 - Mislanding measurement system for color cathode ray tube display - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mislanding measuring device for a color receiver.

[0002]

2. Description of the Related Art In a color receiver such as a color television receiver or a color monitor receiver, a color picture tube (color CRT) is generally used. The color picture tube includes an aperture grill and a shadow mask. Because it uses a mechanical color selection grid, when the electron beam is affected by geomagnetism, it causes mislanding,
This appears as a color shift (color blur).

FIG. 5 shows a state of mislanding on the fluorescent screen of the color picture tube, and when the color receiver is facing south, as shown in FIG. Mislanding occurs in the direction and size of the difference between the broken line and the solid line (difference in the horizontal scanning direction). Further, when the color receiver faces north, east, and west, mislanding as shown in B, C, and D of FIG.

For this reason, in the past, when manufacturing a color image receiver, it was used that a red, green or blue color is produced in a single color on a picture tube, and if mislanding occurs, color shift occurs and the hue changes. The mislanding was visually judged and adjusted.

[0005]

However, when the mislanding is visually determined as described above, the determination accuracy changes depending on the color, and the accuracy is lowered. In addition, the determination accuracy changes depending on the condition of the determiner and the surrounding conditions.

The present invention is intended to solve such a problem.

[0007]

Now, for example, only a red signal is supplied as a video signal to a color receiver to be measured for mislanding, and the entire effective screen of the color receiver is imaged by a color video camera.

Then, unless mislanding has occurred in the color receiver to be measured, only the red signal can be obtained from the video camera, and the green signal and the blue signal cannot be obtained. However, if mislanding is occurring, the level of the red signal from the video camera is lowered and a green signal or a blue signal is obtained at the position where the mislanding is occurring.

At this time, in a color picture tube such as a Trinitron tube ("Trinitron" is a registered trademark), its phosphor screen has red, green and blue phosphor stripes PR, as shown in FIG. PG and PB are repeatedly arranged in the horizontal scanning direction, and these stripes PR to PB are also arranged.
The carbon stripes CS are arranged in between.

Therefore, if a green signal or a blue signal is obtained from the video camera when a red signal is supplied to the color receiver, it is understood that mislanding is occurring, and at the same time, the obtained color signal is obtained. Whether the mislanding direction is the left direction or the right direction can be determined depending on whether the green signal or the blue signal is. Further, the magnitude of the mislanding can be known from the level of the obtained color signal.

The present invention pays attention to such a point and makes it possible to measure the mislanding with high accuracy by giving an equivalent earth magnetism to the color image receiver to be measured and to automate the measurement. It was realized.

That is, according to the present invention, the predetermined pole
Current supply means for outputting a current of sex and size, the
Electric current is supplied, and it is equivalent to the geomagnetism of the specified area.
Measures the magnetic field when facing a given direction in a certain area
Multiple pairs of coils for the entire constant color receiver, and red
Color, green and blue primary color video signals
Signal to be supplied to the above-mentioned color receiver under test
Forming circuit and the above-mentioned supplied to the color receiver under test
The three primary color video signals are converted into the above primary colors of red, green and blue.
A switching circuit for switching the order among the video signal, the
Color capture that captures the entire display screen of the measured color receiver
The imaging means and the imaging output from the color imaging means are
Misrun by processing every switching of the three primary color video signals
Receiver having a processing circuit for calculating the amount of shadowing
This is a mislanding measuring device .

[0013]

With the video signal S41 from the signal forming circuit 41, an image for measurement is formed on the color receiver 10 to be measured,
This image is captured by the color video camera 42.
Then, the imaging outputs RB are analyzed and processed by the microcomputer 45, and the mislanding amount or the success or failure of the landing is output.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the arrangement of a measuring device according to the present invention and the manner of measurement. Reference numeral 10 is a color receiver to be measured in which mislanding is measured. Then, the image receivers 10 are sequentially carried one by one to a measurement position by a carrier 20 such as a belt conveyor. The transfer of the image receiver 10 is performed by the microcomputer 4 described later.
It is synchronized with the process of 5.

Further, 30 is a Helmholtz coil, and this coil 30 is composed of three pairs of coils Lx, Ly and Lz, and these three pairs of coils Lx to Lz are connected to the receiver 10 which is carried to the measurement position. , Are arranged so as to be sandwiched from the front, back, left, right, and bottom. The size of the coils Lx to Lz depends on the size of the image receiver 10, but one side is 2 to 2.
It is 3m.

Therefore, by supplying a direct current to the coils Lx to Lz and controlling the polarity and magnitude of the direct current, a magnetic field equivalent to the earth's magnetism can be given to the receiver 10. It is possible to equivalently turn the receiver 10 to the south or north without moving it from the measurement position. Alternatively, in different regions such as Japan and the United States, the magnitude and direction of the geomagnetism also differ, but such differences can be dealt with.

FIG. 2 shows an example of the circuit of the measuring device. In the receiver 10, 11 is its color picture tube, 1
Reference numeral 2 is a deflection coil, and 13 is a landing adjusting means.

Reference numeral 41 denotes a signal forming circuit. The signal forming circuit 41 supplies a predetermined color video signal S41 to the image receiver 10, and the image receiving tube 11 thereof has a color pattern required for measurement, for example, 3 A primary color, a white dot pattern, a crosshatch pattern, etc. are displayed.

Further, reference numeral 42 denotes a color video camera, which is arranged so as to face the fluorescent screen of the receiver 10 carried to the measurement position by the carrier 20 at the time of measurement of mislanding, and for example, The imaging lens of the camera 42 is used as a zoom lens, and the entire effective screen of the picture tube 11 is imaged by the camera 42.

Then, the red signal R, the green signal G and the blue signal B are taken out from the camera 42, and the three primary color signals R to B are converted from analog signals to digital signals in the A / D converters 43R to 43B. The signals R to B which have been A / D converted and converted into the digital signals are once written in the frame memories 44R to 44B. Then, the signals R to B of the memories 44R to 44B are read by the microcomputer 45 when necessary and taken into the microcomputer 45.

In this microcomputer 45, the three primary color signals R to B fetched therein, particularly the fluorescent screen of the picture tube 11, as shown in, for example, FIG. 1, 1) to (15, 15) are set at the measurement point (V, H) [V = 1 to 15, H = 1 to 15]
Each time, the signals RB are analyzed and processed to form a color video signal indicative of the measurement result and the signal is supplied to the monitor display 50.

Further, the microcomputer 45 controls the signal forming circuit 41 according to the content of the measurement, and sets the pattern displayed on the receiver 10 according to the content of the measurement.

Further, the microcomputer 45 outputs digital signals Sx, Sy, Sz for giving a magnetic field to the receiver 10, and these signals Sx to Sz are D / A converter 47.
DC current Ix of a predetermined level supplied to X to 47Z
These currents Ix to Iz are D / A converted into Iz and supplied to the coils Lx to Lz through the power amplifiers 48X to 48Z, respectively. In this way, the geomagnetism equivalent to that when the image receiver 10 is oriented to the south or north is given to the image receiver 10 that has been transported to the measurement position.

A printer 60 for printing out the measurement result of the image receiver 10 is connected to the microcomputer 45.

The landing is measured by the microcomputer 10 as follows. 1 Move the receiver 10 to be measured to the measurement position (FIG. 1).

2 The currents Ix to Iz are controlled to control the receiver 10
Make the magnetic field to face south.

3 Degaussing (demagnetization) of the picture tube 11 is performed.

4 The video signal S41 from the forming circuit 41 is a red signal, and the color of light emitted from the picture tube 11 is red.

5 The levels of the signals R to B from the camera 42 are measured at each measurement point. In this case, as described above,
If mislanding does not occur, only the signal R is obtained and the signals G and B are not obtained at any measurement point. However, if mislanding occurs at a certain measurement point, the level of the signal R decreases at that measurement point, and the signal G or the signal B is obtained according to the direction and magnitude of the mislanding. Therefore, the levels of the signals R to B at each measurement point are set to SRr (V, H), SGr (V, H), SBr (V,
H).

6. The video signal S41 from the forming circuit 41 is a green signal, and the color of light emitted from the picture tube 11 is a single green color.

7 The levels of the signals R to B are measured at each measurement point. In addition, the signal R at each measurement point at this time
The levels of B are SRg (V, H), SGg (V, H), SBg (V,
H).

8 The video signal S41 from the forming circuit 41 is a blue signal, and the color of light emitted from the picture tube 11 is blue.

9 The levels of the signals R to B are measured at each measurement point. In addition, the signal R at each measurement point at this time
The levels of B are SRb (V, H), SGb (V, H), SBb (V,
H).

10 The currents Ix to Iz are controlled and the receiver 10
Turn the magnetic field toward to north.

11 Degaussing (demagnetization) of the picture tube 11 is performed.

12 The above items 4 to 9 are repeated. However,
The levels of the signals R to B in this case are NRr (V, H), NGr (V, H), and NBr (V, H), respectively.
H) NRg (V, H), NGg (V, H), NBg (V,
H) NRb (V, H), NGb (V, H), NBb (V,
H).

13 The crosstalk value (ratio of the other two colors to the emission color) when the magnetic field faces south is calculated for each measurement point. That is, the green crosstalk value SRGx (V, H) = SGr (V, H) / SRr (V,
H) Crosstalk value for blue with respect to red SRBx (V, H) = SBr (V, H) / SRr (V,
H) Crosstalk value of blue for green SGBx (V, H) = SBg (V, H) / SGg (V,
H) Crosstalk value SGRx (V, H) = SRg (V, H) / SGg (V, for red with respect to green)
H) Red crosstalk value for blue SBRx (V, H) = SRb (V, H) / SBb (V,
H) Crosstalk value of green to blue SBGx (V, H) = SGb (V, H) / SBb (V,
H) is calculated.

14 The crosstalk value when the magnetic field faces north is calculated for each measurement point. Crosstalk value of green with respect to red NRGx (V, H) = NGr (V, H) / NRr (V,
H) Crosstalk value for blue with respect to red NRBx (V, H) = NBr (V, H) / NRr (V,
H) Crosstalk value of blue for green NGBx (V, H) = NBg (V, H) / NGg (V,
H) Crosstalk value of red to green NGRx (V, H) = NRg (V, H) / NGg (V,
H) Red crosstalk value for blue NBRx (V, H) = NRb (V, H) / NBb (V,
H) Crosstalk value of green to blue NBGx (V, H) = NGb (V, H) / NBb (V,
H) is calculated.

15 The difference between the crosstalk value when facing south and the crosstalk value when facing north is calculated. As shown in FIG. 6, in the picture tube 11, the left side of the green phosphor stripe is the red phosphor stripe, and the right side is the blue phosphor stripe. That is, red hue change (mislanding to the left phosphor stripe) RBx = | SRBx (V, H) -NRBx (V, H) | red hue change (mislanding to the right phosphor stripe) RGx = | SRGx (V, H) -NRGx (V, H) | Green hue change (mislanding to the phosphor stripe on the left side) GRx = | SGRx (V, H) -NGRx (V, H) | Green Hue change (mislanding to right phosphor stripe) GBx = | SGBx (V, H) -NGBx (V, H) | Blue hue change (mislanding to left phosphor stripe) BGx = | SBGx ( V, H) -NBGx (V, H) | Blue hue change (mislanding to the phosphor stripe on the right side) BRx = | SBRx (V, H) -NBRx V, H) | is calculated.

When the 16 difference or its change rate (change amount of difference between two measurement points) is larger than the specified value, it is determined that mislanding has occurred at the corresponding measurement point. That is, if RBx> specified value, mislanding has occurred. If RGx> prescribed value, mislanding has occurred. ..... If BRx> specified value, mislanding has occurred.

17 With respect to the receiver 10 in which the mislanding has occurred, the judgment result is printed out by the printer 60. In addition, the person in charge refers to this printout to adjust the mislanding of the corresponding receiver 10.

With the above, the measurement of the mislanding of the receiver 10 is completed. FIG. 4 shows the measurement result, that is,
An example of the printout of item 17 is shown, in which the identification number of the receiver 10 and the model number are printed on the top line,
The state of mislanding when there is no magnetic field in the area
A mislanding state in the case of a north-facing magnetic field and a mislanding state in the case of a south-facing magnetic field are printed in the area 1 and 2.

In this case, the identification number and model number of the image receiver 10 are read from the bar code label attached to the image receiver 10, for example. Also, the printing of 15 characters x 15 characters on the left side of area ~ indicates mislanding to the phosphor stripe on the left side, and the printing of 15 characters x 15 characters on the right side indicates mislanding to the phosphor stripe on the right side. , “.”, “R”, and “G” indicate the state of mislanding at each measurement point, and “.” Indicates that there is no mislanding.

"R" on the left side of the "R" indicates that there was a mislanding to the left side (blue phosphor stripe side) when red light was emitted at the measurement point where the "R" is located, and Indicates that this mislanding was greater than any other mislanding. Also,
"G" on the right side of "," means that there was a mislanding to the right side (blue phosphor stripe side) when green light was emitted at the measurement point where "G" is located,
And that this mislanding was greater than the other mislandings.

In the case of such mislanding, when the magnetic field is in the opposite direction to this case, the mislanding is eliminated and only "." Is printed.

In the above description, the measurement is not performed when the magnetic field is in the east direction and the west direction, but as shown in FIG. 5, the mislanding when the magnetic field is in the east direction and the west direction indicates that the magnetic field is in the south direction or It is omitted because it is included in the mislanding when facing north.

[0047]

As described above, according to the present invention, the mislanding of the color receiver 10 can be measured. In this case, in particular, according to the present invention, the signal forming circuit 4 is used.
The three primary color signals as the video signal S41 from 1 are supplied to the color receiver 10 to be measured, and the picture tube 11 at that time is supplied.
The emission color of the image is captured by the color video camera 42, and the three primary color signals RB output from the camera 42 are analyzed and processed so that the direction and magnitude of the mislanding can be known. The mislanding can be measured or determined with much higher accuracy than the case of visually determining the mislanding.

Further, the accuracy of the judgment does not vary depending on the condition of the judge and surrounding conditions.

Further, since it is determined that there is a mislanding when there is a difference between the magnetic field facing south and the magnetic field facing north, an error component due to the measurement system is generated. However, the error component does not affect the determination result, and a highly accurate determination result can be obtained.

Further, since the Helmholtz coil 20 supplies a magnetic field equivalent to the earth's magnetism to the receiver 10 to be measured, the receiver 10 is turned to the south for each measurement content at the time of measurement. No need to face north and you can make quick measurements. Furthermore, the geomagnetism of an arbitrary area can be reproduced, which is particularly effective for receivers for export.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a measurement state in the present invention.

FIG. 2 is a system diagram showing an example of the present invention.

FIG. 3 is a diagram showing an example of measurement points for mislanding.

FIG. 4 is a diagram showing an example of measurement results of mislanding.

FIG. 5 is a diagram showing an example of mislanding.

FIG. 6 is a partial view showing an example of a fluorescent screen of a color picture tube.

[Explanation of symbols]

10 Color receiver to be measured 11 color picture tube 12 deflection coils 13 Landing adjustment means 20 career 30 Helmholtz coil 41 Signal forming circuit 42 color video camera 43R-43B A / D converter 44R-44B frame memory 45 microcomputer 47X-47Z D / A converter 50 monitor display 60 printer Lx to Lz coil

Claims (4)

(57) [Claims] 1. A signal supply means connected to a color cathode ray tube display device to be measured for mislanding, for supplying a predetermined video signal to the color cathode ray tube display device, and a display screen of the color cathode ray tube display device. A color image pickup means for picking up an image of the whole and a single color image signal of red, green or blue is supplied to the color cathode ray tube display device as the predetermined image signal by controlling the signal supply means. Among the imaging outputs obtained from the color imaging means,
A mislanding measuring device for a color cathode ray tube display device, comprising: a processing means for detecting a color component other than the color of the supplied monochromatic video signal to calculate a mislanding amount. 2. The mislanding measuring device for a color cathode ray tube display device according to claim 1, further comprising a plurality of pairs of coils for applying a magnetic field equivalent to the geomagnetism of a predetermined area to the color cathode ray tube display device. 3. The processing means supplies an electric current of a predetermined polarity to the plurality of pairs of coils, and is equivalent to the geomagnetism of the predetermined area to the color cathode ray tube display device, and a magnetic field facing south or respectively. 3. The color cathode ray tube display device according to claim 2, wherein a north-facing magnetic field is applied, mislanding amounts in the south-facing magnetic field and the north-facing magnetic field are calculated, and a difference between the mislanding amounts is calculated. Mislanding measuring device. 4. The mislanding of the color cathode ray tube display device according to claim 1, wherein the processing means determines whether or not the calculated mislanding amount or difference is within a specified value. measuring device.