JPH03119891A - Convergence measuring device - Google Patents

Abstract

PURPOSE:To almost fix the current value of each primary color in a measuring block and to prevent measurement error caused by high voltage fluctuation by dividing the surface of a tube into a measuring area to project a luminescent line and a non-measuring area to project the other two colors not to be measured, and almost samely setting the total area of the luminescent line to be projected in the measuring area and the picture area of the respective colors to be projected in the non-measuring area. CONSTITUTION:A convergence measuring device A is arranged at a position faced to a tube surface 2 of a color CRT 1 and equipped with an optical sensor 4 with the property of directional sensitivity of uni-model property, CPU 8 and pattern generator 15. The CPU 8 executes arithmetic for comparing light intensity data for each primary color according to the detection output of an optical sensor 4' and calculates the amount of miss convergence. The pattern generator 15 divides the tube surface into the measuring area and the non-measuring area. In the measuring area, the luminescent ling for each primary color is arranged at fixed intervals and a pattern to be moved in a vertical direction is projected. In the non-measuring area, the other two colors, which are not desired to be measured, are projected. Then, a video signal is outputted to the color CRT 1 so as to almost samely set the total area of the luminescent line to be projected in the measuring area and the picture area of the respective colors to be projected in the non-measuring area.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a convergence measuring device I for measuring the convergence pattern 1 of a color CRT of a television receiver.

[Summary of the invention] The present invention projects R-rays of each primary color on the screen of a color CRT,
Misconvergence is detected by detecting the light intensity data of each primary color.
In the convergence and f7 constant device that measures
By dividing the area into a non-measuring area that reflects colors and setting the total area of bright lines reflected in the measuring area and the image area of each color reflected in the non-measuring area to be almost the same, each primary color that is energized to the color CRT can be Since the current value is approximately constant during the measurement period, measurement errors due to high voltage fluctuations due to different current values for each primary color can be prevented.

[Prior Art] The present applicant previously proposed a phase detection type convergence measurement device (see Japanese Patent Application No. 310670/1983).
.

This convergence measuring device has a pattern generator that outputs a video signal to a color CRT that is a measurement target. This pattern generator creates a video signal that gradually shifts the bright lines (vertical or horizontal) of each primary color in a part of the screen of a color CRT in the vertical direction, and projects a white pattern in other areas. do. An optical sensor is arranged at a position facing the tube surface, and this optical sensor has a single-peak directional sensitivity characteristic. The detection output of the sensor is then supplied to a calculation means, and this calculation means calculates the amount of misconvergence from the light intensity data of each primary color.

An optical sensor is placed at an arbitrary position on the screen of the color CRT, and a pattern generator projects bright lines for each primary color on the screen of the color CRT. The calculation means creates an envelope curve for each primary color from the detection output of each primary color of the optical sensor, calculates the position of the peak value of this envelope curve, and compares the position of the peak value for each primary color to prevent misconvergence m. Calculate. The amount of misconvergence is measured at a plurality of locations on the screen of the color CRT by changing the position of the optical sensor on the screen.

In the above measurement, the reason why a white area is generated on the tube surface is that when green, red, and blue bright lines are individually projected on the tube surface, the beam current of the color CRT changes and the high voltage changes. When the high voltage changes in this way, the position of the color electron peak shifts, so a white area is provided on a part of the tube surface to improve the instability of the high voltage.

[Problems to be Solved by the Invention] However, even if the white area is provided as described above, the current value of the current bright line color is larger than the current value of other colors, so the RGB color is changed every time the bright line color is switched. The current value h゛(varies).This change in current value causes fluctuations in high voltage, specifically the way the high voltage drops, which causes a positional shift in the bright line, which has the disadvantage of causing measurement errors.To prevent this. Therefore, it is generally considered to reduce the difference between the current values of each primary color by narrowing the width of the bright line, but this cannot be adopted because reducing the width of the bright line causes problems such as deterioration of S/N.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a convergence measuring device that prevents high voltage fluctuations due to differences in current values of each primary color and eliminates measurement errors caused by high voltage fluctuations.

[Means for Solving the Problems] A convergence measurement device of the present invention for achieving the above object includes a light sensor arranged at opposing positions on the tube surface of a color CRT and having a single-peak directional sensitivity characteristic; A misconvergence amount calculation means that calculates the amount of misconvergence by comparing and calculating the light intensity data for each primary color from the detection output of the sensor; A pattern in which bright lines are arranged at regular intervals and moved in the vertical direction is projected, and the other two colors that are not measured are projected in the non-measurement area, and the total area of the bright lines reflected in the measurement area and the non-measurement area are and a pattern generator that outputs a video signal to the color CRT to set the image area of each color to be approximately the same.

[Function] When a red bright line pattern is projected on the measurement area of the tube surface, green and blue images are projected on the non-measurement area, and then when a green bright line pattern is projected on the measurement area, a non-measurement area is displayed. The bright line pattern is changed by projecting red and blue in the measurement area, and the light intensity data of each primary color is detected to calculate the amount of misconvergence. And when making this measurement,
Since the total area of the bright line and the image area of each of the other two colors in the non-measurement area are almost the same in the middle of the measurement section, the current value of each primary color applied to the color CRT is almost constant, and high voltage fluctuations do not occur. The emission line position does not shift due to high pressure fluctuations.

C Example] Embodiments of the present invention will be described below with reference to the drawings.

Figure 2 shows the convergence measurement bag g! The measured deafness to i is shown. In Figure 2, television receiver B
has a built-in color CRT (color cathode ray tube) 1 to be measured, and the tube surface 2 of this color CRT is exposed to the front. The signal cable 3 of the convergence measurement device A is connected to the video signal input terminal of the television receiver B, and an image is projected on the screen 2 of the color CRTI by the video signal output from the convergence measurement bag riA.

Further, the convergence measurement device A includes an optical sensor 4 connected by a cable, and the sensor 4 is disposed facing the tube surface 2 at a contact position with the tube surface 2.

FIG. 3 shows a cross-sectional view showing the positional relationship between the tube surface 2 and the optical sensor 4. In FIG. 3, the tube surface 2 is made up of a fluorescent section 2b arranged on the inner surface of a panel glass 2a, and when the fluorescent section 2b is irradiated with an electron beam, it emits light. Further, the optical sensor 4 is provided with a microswitch SW, and when the optical sensor 4 is brought into contact with the tube surface 2, the microswitch SW is turned on.

Measurement is started by the ON signal of this microswitch SW, and the flowchart shown in FIG. 11 is executed.

FIG. 4 shows a directional sensitivity characteristic diagram of the optical sensor 4. In Figure 4, the horizontal axis is color CRT! The incident angle (degrees) of light incident on the optical sensor 4 from the tube surface 2 is shown, and the vertical axis represents the intensity (in degrees) of the incident light on the optical sensor 4 at each incident angle.
Relative light intensity when the light intensity when the incident angle is Oo is taken as 100%) is shown. The directional sensitivity characteristics of the optical sensor 4 are maximum when the incident angle is 0°, and as the absolute value of the incident angle increases, the light intensity decreases and becomes 0% when the absolute value of the incident angle is approximately 20', which is a so-called simple type. exhibits peak characteristics.

FIG. 1 shows a circuit block diagram of the convergence measuring bag gIA. In FIG. 1, the detection output (light intensity data) of an optical sensor 4 is guided to an A/D converter 6 via an amplifier 5, and is digitized by the A/D converter 6.

The digitized light intensity data is written into the measurement data memory 7 based on a write signal from the CPU 8. c.
In addition to this measurement data memory 7, pus is a calculation memory 9.
and controls reading and writing of the program memory IO. The calculation memory 9 stores calculation data necessary for processing various data. The program memory IO stores data for executing a measurement program, a modulation degree calculation program, a non-heterogeneous constant region change program, a bright line spacing automatic correction program, a misconvergence m calculation program, and a display program. The contents of each program will be explained together with the following operations. The CPU 8 has a modulation degree calculation means that is driven according to a modulation degree calculation program and a misconvergence m calculation means that is driven according to a measurement program. The modulation degree calculation means first restores the maximum value MAX and minimum value MIN of the light intensity data of the primary colors to be measured, and calculates (MAX
-MIN)/(MAX+MNN)=F to calculate the modulation degree F. The value of this modulation degree is 0.2 to 0.
If it is within the range of 6, it is determined to be appropriate, and if it is outside this range, it is determined to be inappropriate. If it is determined that it is inappropriate, the modulation degree data is sent to the # line spacing calculating section 11. Also, g-flat, 11
If the degree value is almost 0, it is the non-measurement area setting part! Sends a non-measurement area change command to 2. In this embodiment, the modulation degree calculation means discriminates the modulation degree from the difference between the maximum value and the minimum value of the light intensity data, but it also determines the modulation degree based on the difference between the maximum value and the minimum value of the light intensity data. It may also be determined based on the angle of inclination).

The misconvergence m calculating means performs interpolation processing on the discrete light intensity data (shown in FIG. 5) read from the measurement data memory to produce light intensity data (envelope curve) that changes finely as shown by the broken line in FIG. Converted,
The time point (position) at which the peak value of the light intensity data (envelope curve) for each primary color is obtained is detected, and for example, the red and blue light intensity data for the time point (position) at which the peak value of the green light intensity data is obtained. The time point at which the peak value of is obtained (position r
1), that is, the amount of misconvergence is calculated.

Further, the CPU 8 operates the bright line interval calculation unit I according to each program.
I drives and controls the non-measurement area setting section I2 and the display section 13. The bright line interval setting unit 11 outputs bright line interval data that determines the interval δ between bright lines projected on the tube surface 2.
If the value of the modulation degree outputted from U8 is a value other than 0.2 to 0.6, bright line interval data corresponding to the value of the modulation degree is output. Non-measurement area setting section! 2 is the non-measurement area S of the screen,
In this example, the right 1/1 of the tube surface 2 is specified.
The configuration is such that either one of the four spaces or the left 1/4 space is set as the non-measurement area S. CPU
When a non-measurement area change command is sent from 8, the opposite area is changed to non-measurement area S! Output the non-measurement area data.

The display unit 13 displays the amount of misconvergence, etc.
If the bright line spacing automatic correction program is not available, the value of the modulation degree is displayed in order to manually correct the bright line spacing.

Furthermore, signals from the keyboard section 14 are input to the CPU 8. By inputting data from the keyboard section 14, the calculation memory 9. Data such as program memory IO can be updated. If the bright line spacing is to be corrected manually, the correction is made by inputting data from the keyboard section I4.

Bright line interval data and non-measurement area data are input to the pattern generator 15 via the CPU 8. The pattern generator I5 generates a video signal that displays an image as shown in FIG. 7, and outputs it to the color CRTI. That is, the tube surface 2 is divided into a region specified by the non-measurement region data as a non-measurement region S, and the other region as a measurement region SL,
In the measurement area S1, a plurality of bright lines of red, green, or blue arranged at regular intervals δ are arranged in the vertical direction for each frame by I/N of the interval δ (N is an integer of 2 or more, and this In the embodiment, a bright line pattern shifted by 4) is projected, and a composite color of the other two colors that are not measured is projected solidly in the non-measurement area St. Then, the total area of the plurality of bright lines in the measurement region S is set to be approximately the same as the image area of each color in the non-measurement region S. Here, the image area of each color refers to the area to which the electron beam of the color is irradiated, and for the composite color area, the area is calculated as the image area of each color. The shift amount of the bright line is 1/H of the bright line interval δ
In this case, as shown in FIG. 7, the ratio of the measurement area SI to the non-measurement area S is N:1°, and the ratio of the bright line width to the bright line interval δ is 1/N.

With this setting, if the vertical dimension of the tube surface 2 is H1 and the horizontal dimension is L, each area is B=G=1/(N+1)・H,R
=N/(N+1)・17N-H=1/(N+1
)・H and become the same. In this example, since N=4, the ratio of the measurement area S to the non-measurement area S is 4:I, and the ratio of the bright line width to the bright line interval δ is 1/4.

Further, as shown in FIG. 8, in the bright line pattern described above, the arrangement of the bright lines changes from the position of the solid line - the position of the dashed dot line - the position of the dashed double dot line - the position of the dashed three dot line as each frame progresses, and this arrangement is repeated. When such a bright line is generated on the tube surface 2, the detection output of the optical sensor 4 is, as shown in FIG. 5, at time points A, B, C, D, a, b, c,
d, α.

The light intensity at ... becomes flujl-like light intensity data exhibiting characteristics that change in an alternating current manner. Therefore, the optical sensor 4 may be placed at any position with respect to the tube surface 2 of the color CRT 1, and the measurement period may be, in principle, a period of four frames. Further, the pattern generator 15 is configured to generate bright lines in the vertical direction shown in FIG. 7 and in the horizontal direction perpendicular to this direction.

Hereinafter, the operation of the above configuration will be explained according to the flowchart of FIG. 11.

When the optical sensor 4 is brought into contact with any part of the tube surface 2 of the color CRT 1, the microswitch SW is turned on. The CPU 8 first executes a modulation degree calculation program in response to an on signal from the microswitch SW. That is, the bright line interval data from the bright line interval calculating section 11 and the white area data from the white area setting section I2 are sent to the pattern generator 15 in response to a control signal from the CPU 8. The pattern generator 15 creates a video signal based on this data, and on the tube surface 2, for example, a red bright line is arranged in the measurement area S1 as shown in FIG. A colored image is displayed. Then, this bright line shifts every - frame, and the light intensity data for each shift (see FIG. 5) is taken into the measurement data memory 7. When the red light intensity data is imported, the modulation degree of the light intensity data is calculated by the modulation degree calculation means, and if the value of this modulation degree is almost zero, the non-measurement area change program interrupts and changes the non-measurement area. If the value of the modulation factor is changed and the value of the modulation degree is outside the range of 0.2 to 0.6, the bright line interval automatic correction program interrupts and corrects the bright line interval δ.

That is, when the optical sensor 4 is placed on the non-measurement area as shown in FIG. 12, all the data values of the light intensity data show approximately the same value as shown in FIG. 13, and the value of the modulation degree becomes Almost zero. Then, a non-measurement area change command is sent from the modulation degree calculation means to the non-measurement area setting section 12. The non-measurement area setting section 12 sends different non-measurement area data to the pattern generator 15, and the image state of the tube surface 2 is changed as shown in FIG. Further, when the optical sensor 4 is located in the measurement region S as shown in FIG. 7, when the bright line interval δ is narrower than the optimum value, the light intensity data becomes as shown in FIG. 9, and the modulation degree value becomes 0. 2 or less, and conversely, the emission line interval δ
When is wider than the optimum value, the light intensity data becomes as shown in FIG. 10, and the modulation degree value becomes 0.6 or more. Then,
The modulation degree value is sent to the brightness Ia interval calculating section 11, and the R-line interval calculating section 11 calculates an appropriate bright line interval δ based on the modulation degree value, and sends it to the pattern generator 15.

When this non-measurement area change program and bright line interval automatic correction program are finished, the modulation degree value will be 0.2 to 0.6.
If the range is within this range, these programs will proceed to the measurement program without interrupting. In this measurement program, the red
Green and blue colors 819 are sequentially projected onto the tube surface 2, and light intensity data as shown in FIG. 5 is stored in the measurement data memory 7 for each of red, green, and blue. If the value of the modulation degree in the modulation degree calculation program is within the range of 0.2 to 0.6, the red light intensity data at that time is used as is, and only green and blue measurements are performed in the measurement program.

Next, the misconvergence amount calculation program is executed, and the misconvergence nail calculation means obtains the peak values of the red and blue light intensity data for the time point (position 'i1) at which the peak value of the green light intensity data is obtained. The difference from the time point (position), that is, the misconvergence mh< is calculated.

Finally, the display program is executed and the amount of misconvergence is displayed on the display section I3. Note that the amount of misconvergence may be displayed on the color CRT 1 that is the object of measurement.

In this way, the state of the vertical and horizontal bright lines can be determined from the tube surface 2 of the optical sensor 4.
By measuring while changing the top position, it is possible to measure the amount of vertical and horizontal misconvergence.

In the above measurement, since the total area of the bright line and the image area of each of the other two colors in the non-measurement area S are the same in the measurement section, the current value of each primary color applied to the color CRT l is constant. Therefore, high pressure fluctuations do not occur. Therefore, displacement of the IJI due to high pressure fluctuations does not occur, and highly accurate measurement results can be obtained.

In this example, in the non-measurement area S, the composite color of the two colors that are not measured is projected solidly, or if the area of each primary color is the same, each primary color is projected in separate parts or partially overlaid. You can also wrap it and show it. Further, in this embodiment, the image area of each primary color is set to be completely the same, but each area may be set to be different as long as high voltage fluctuations do not occur.

[Effects of the Invention] As described above, according to the present invention, a convergence measurement device that measures the amount of misconvergence by projecting the bright lines of each primary color on the screen of a color CRT and detecting the light intensity data of each primary color. dividing the tube surface into a measurement area in which the bright line is reflected and a non-measurement area in which the other two colors that are not measured are not reflected;
Since the total area of the bright lines reflected in the measurement area and the image area of each color reflected in the non-measurement area were set to be almost the same, the current value of each primary color applied to the color CRT is approximately constant during the measurement period. This has the effect of preventing measurement errors caused by high voltage fluctuations due to different current values for each primary color.

In addition, since the red, green, and blue current values are approximately constant during measurement, the frequency characteristics of the color CRT's red, green, and blue drive circuits, and the rise characteristics of the color CRT's cathode (
This has the effect of eliminating the negative effects of low-frequency f-characteristics.

[Brief explanation of drawings]

1 to 13 show embodiments of the present invention, FIG. 1 is a circuit block diagram of the convergence measuring device, FIG. 2 is a perspective view showing the measurement state, and FIG. 3 is the position of the tube surface and the optical sensor. Figure 4 is a directional sensitivity characteristic diagram of the optical sensor; Figure 5 is a diagram showing light intensity data; Figure 6 is a diagram showing light intensity data with appropriate modulation degree; Figure 7 is a diagram showing the relationship. Figure 8 shows the bright line generation state, Figure 8 shows the arrangement of the bright lines, Figure 9 shows the light intensity data when the modulation value is small, and Figure 1O shows the light intensity data when the modulation value is large. FIG. 11 is a flowchart diagram, FIG. 12 is a front view of the television receiver, and FIG. 13 is a diagram showing light intensity data when the optical sensor is placed on a non-measurement area. be. A...Convergence measuring device, I...Color CR
T, 2...tube surface, 4...light sensor, 8...CPU
(Misconvergence amount calculation means), 15... pattern generator. Floor 1, cane frame, 1 x hand view, 2nd figure, A8CDabcdα, 9th grade, 9th grade, upper level, 5th floor, 5th floor, 6th drawing, 4th floor house! Fig. 3-15-10-5051015 Angle - Maruden τ's f1 direction skin 1 to punching figure Fig. 4 Fig. 8 Light intensity of Fig. Figure 10 shows the front view of Rayon Ukei Elephant ABCDabcda Water Sensor Scale White Figure 13: Strongly forged data 27f of the pigeon coop that was blown away by a tilter.

Claims (1)

[Claims] (1) Optical sensors are placed opposite to each other on the screen surface of a color CRT and have a single-peak directional sensitivity characteristic, and the light intensity data for each primary color is compared and computed from the detection output of this optical sensor to determine the amount of misconvergence. a misconvergence amount calculation means for calculating the amount of misconvergence, dividing the tube surface into a measurement area and a non-measurement area, projecting a pattern in which emission lines of each primary color are arranged at regular intervals and moved in the vertical direction in the measurement area, The color CRT displays a video signal that projects the other two colors that are not measured in the non-measurement area, and sets the total area of the bright lines reflected in the measurement area to be approximately the same as the image area of each color reflected in the non-measurement area. A convergence measurement device characterized by comprising: a pattern generator that outputs a pattern generator.