JPH03201694A - Color cathode ray tube device and color slurring correcting method for the same - Google Patents

Abstract

PURPOSE:To enable color slurring correction with simple control and high accuracy by controlling the current value of a solenoid coil and correcting color slurring so that a central beam G cannot be moved but both end elec tronic beams can be moved horizontally and vertically. CONSTITUTION:At the electronic gun part of an inlined electronic gun color cathode ray tube 1, a dynamic convergence correction magnet 100 is mounted with four pairs of the solenoid coils to generate magnetic fields so as to move the right and left electronic beams horizontally or vertically. The deviation of the respective electronic beams at both ends in the horizontal and vertical directions is corrected by a current to flow to two solenoid coils 111 and 121 and the deviation of the respective controlled both end electronic beams and the fixed central electronic beam in the horizontal and vertical directions is controlled by a current to flow to remained two solenoid coils 131 and 141. Thus, the color slurring of the inlined electronic gun arranging color cathode ray tube 1 can be easily corrected with high accuracy.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a color cathode ray tube device and a color shift correction method, and particularly relates to a color cathode ray tube device with an in-line electron gun arrangement that displays high-density images and its color shift correction method. Regarding the correction method.

[Prior Art] Generally, a color cathode ray tube display device such as a television receiver has a configuration as shown in FIG.

That is, the cathode ray tube 1 includes a static convergence magnet 2 and an auxiliary magnet 8 for correcting color shift. Horizontal deflection coil 3. The three electron guns corresponding to red, green, and blue (hereinafter abbreviated as R, G, and B) of the cathode ray tube 1 are equipped with a vertical deflection coil 4 and a vertical deflection coil 4.
The present invention is directed to inline types arranged in a straight line.

R, G, and B signals in an input video signal 9 are applied to these electron guns via a video amplifier circuit 6, and a synchronization signal separated and shaped from the input video signal 9 in a synchronization separation circuit 7 is applied to a deflection circuit. 5 as a deflection current to the horizontal and vertical deflection coils 3 and 4, respectively, to perform raster scanning.

A portion of the cathode ray tube 1 related to color shift is shown in FIG. FIG. 2 is a horizontal cross-sectional view of the cathode ray tube 1, and shows the electron gun section 1.
The three electron guns (cathode) for R, G, and B described in 1 are arranged horizontally, and the electron beam 13 emitted from them is deflected by a horizontal deflection coil 3 to form a light emitting point on the display surface 12. arise.

It is desirable that the light emitting point on the display surface 12 be a single white point when the R, G, and H electron beams coincide and each beam has the same intensity, but in reality, due to mechanical dimensions. Due to errors, distortion of the deflection magnetic field, etc., the light emitting points do not match, resulting in a color shift of several orders of magnitude. This situation is the same in the vertical direction, and the situation is schematically shown in FIG. 3 when viewed from the front of the display surface 12.

That is, in this figure, the display surface 12 is divided into nine zones.

It shows typical color misregistration conditions, and the color misregistration generally varies depending on the zone.

In order to correct such color shift, conventionally, the static convergence magnet 2 shown in FIG. 2 is attached coaxially with the first quadrupole magnet 21, as shown in FIG. Second quadrupole magnet 22. First hexapole magnet 23. It consists of a second six-pole magnet 24. As shown in FIG. 4, these magnets deflect beams R and B other than the central beam G in the directions of the solid arrows, respectively, by the lines of magnetic force H generated by these magnets. In addition, these four magnets can rotate around the beam as shown by the arcuate dotted arrow ROT, and due to their rotation, the deflection directions of the R and B beams are changed as shown by the dotted arrow in Figure 4. can be changed to Therefore, by adjusting the rotation angles of these magnets, color shift can be corrected.

[Problems to be Solved by the Invention] FIG. 5 shows how the static convergence magnet 2 corrects the color shift in the HIVI zone at the center of the display screen in FIG. 3, for example.

In the central H1 and Vl zones of the screen, the R, G, and B light emitting points coincide. However, in the upper left HO and VO zones of the display screen, if the initial deviation is as shown in Figure 3, R, G,
The light emitting points of H do not match. In order to correct the difference in color shift depending on the zone of the display screen, adjustment is made by attaching auxiliary magnets 8 around the deflection coils 3 and 4 through trial and error, but this method requires a long time for adjustment. However, the limit for correcting the brown color shift is about 0.7 mm when looking at the entire display surface (no white spot, but a portion where the color shift is felt remains), making it impossible to improve the image quality.

SUMMARY OF THE INVENTION An object of the present invention is to provide a color cathode ray tube device and a method for correcting the color deviation, in which the color deviation of an in-line electron gun disposed color cathode ray tube is corrected with high precision, which has been difficult in the conventional method.

[Means for Solving the Problems] The present invention provides an electron gun section of an in-line electron gun color cathode ray tube, in which the left and right electron beams are moved horizontally or vertically by having a magnetic field of zero for the central electron beam. A dynamic convergence correction magnet with four sets of electromagnetic coils that generates a magnetic field is implemented. Then, the direction and magnitude of the current flowing through these electromagnetic coils are adjusted. First, the horizontal and vertical deviations of the electron beams at both ends are adjusted by currents flowing through two electromagnetic coils. is adjusted by the current flowing through the remaining two electromagnetic coils.

In the color cathode ray tube device of the present invention, the screen is divided into a plurality of zones, and each zone is provided with a memory that stores current value data obtained through such adjustment.

[Function] The center beam G is not moved, and the electron beams R and B at both ends are moved horizontally and vertically.The current value of the electromagnetic coil is adjusted to correct color shift, so adjustment is easy and highly efficient. Accurate color shift correction becomes possible. Furthermore, since the screen is divided into a plurality of zones and current value data for color shift correction is stored in the memory for each zone, highly accurate color shift correction can be performed over the entire screen.

[Example] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 6 is a block diagram schematically showing a color cathode ray tube display device to which the present invention is applied. Compared to the conventional one shown in FIG. 1, a color shift correction circuit 200 is added and a dynamic convergence correction magnet 100 is installed. The parts have characteristics.

FIG. 7(a) shows an example of the configuration of the dynamic convergence correction magnet 100 shown in FIG. 7(b).
Pole magnets 101, 102 and two six-pole magnets 1
It has been admonished since 03,104, and the 4-pole magnet 101,
102 is a conventional magnet 22.1 shown in FIG.
A magnetic field similar to that of 23 is formed. This magnetic field causes the beams R and B to move in the direction shown by the arrow in FIG. 7(a), as in the case of FIG. 4. In addition, the 6-pole magnet 103,1
04 is an electromagnetic coil 1 each consisting of six partial coils.
A magnetic field is formed by the magnets 31 and 141, and the direction of movement of the beams R and H by the magnetic field is the same as that of the magnets 24 and 25 in FIG. 4, as shown by the arrows. However, these four magnets do not rotate around the beam axis like the static convergence magnet shown in FIG. 4, and the beam movement in the diagonal direction is realized by a combination of vertical and horizontal movement.

FIGS. 8(a) and 8(b) show another example of the structure of the dynamic convergence correction magnet 100 shown in FIG. 8(0), in which two magnets are combined. That is, the magnet 105 is.

Fig. 7(b) +7) 4-pole magnet 101, 1o-2
are assembled into the same iron core, and the electromagnetic coil is 111゜1.
The magnet 106 has an 8-pole structure in which 21 partial coils are arranged alternately, and the magnet 106 has the 6-pole magnets 103 and 104 shown in FIG. 7(b) incorporated into the same iron core. , 141 has a 12-pole structure in which each partial coil is arranged alternately. Therefore, the magnet 105 provides the combined movement of the beam movement caused by the magnets 101 and 102 in FIG. 7(b), and the magnet 106 similarly provides the combined beam movement of the beam movement caused by the magnets 103 and 104 in FIG. 7(b). However, if the current applied to each of the four electromagnetic coils 111 to 141 is the same, the magnets shown in FIGS. 7 and 8 have the same beam movement effect.

FIG. 9 shows an embodiment of the color shift correction circuit 200. In the following explanation, the effective area of the cathode ray tube display surface is divided into seven parts horizontally and eight parts vertically, and dynamic convergence correction is performed for each of the 56 zones divided into 56 grid-shaped zones. .

Therefore, in FIG. 9, the voltage controlled oscillator 212 outputs a nominal frequency eight times that of the horizontal synchronizing signal 71, and this and the phase comparator 211 constitute a PLL circuit to synchronize eight times that of the horizontal synchronizing signal 71. Generate a signal. This output is the horizontal address counter 2 which is reset by the horizontal synchronization signal 71.
13, so the horizontal address HA of each zone horizontally divided into 8 on the display screen is counted by the counter 21.
3 and input to the memory 231. This operation is shown in FIG. 10. Since the portion of the address HO corresponding to the erased area E is invalid on the display screen, there are seven valid portions H1 to H7.

On the other hand, the address VA of each zone in the vertical direction is determined by the frequency division counter 222. The vertical address counter 221 performs the operation shown in FIG. 11. Input signal (video signal 9
) is 17 times the horizontal period and the number of effective rasters is 512, the vertical synchronization signal 72 is output at the time of the vertical synchronization period vS between the two equivalent periods EQ.

In the figure, the raster number at this time is shown below the horizontal synchronization signal 71, and the period between rasters S3 to S16 becomes the vertical retrace period ER. Therefore, the frequency division counter 222 is preset to the value 50 by the vertical synchronization signal 72, and at the same time, the vertical address counter 221 is reset. After this point 6
The frequency division counter 222 of the quaternary counter receives the horizontal synchronization signal 7.
It counts 1, clears itself every time it overflows, and provides one input to the vertical address counter 221.

Therefore, the vertical address counter 221 is 0 for approximately 14 horizontal periods of rasters S3 to S16 from the time it is reset until the content of the frequency division counter 222 becomes 63, and thereafter is 0.
l for each horizontal period, 2. ....

Outputs 8. This output 1. . . , 8 corresponds to the effective raster number 512 of raster numbers O to 511.

Then, the remaining raster numbers So, 81. 9 during S2
is output and reset again. These vertical address counter 221 outputs are stored in memory 2 as vertical addresses VA.
31.

When the address corresponding to the scanning position is specified as described above, the corresponding color shift correction data is read out from the memory 231 and the four digital-to-analog converters 241 to
244, it is converted into a current signal and applied to the four electromagnetic coils 111, 121, 131, and 141 for color shift correction described above, and the current is detected by resistors 251 to 254, respectively, and sent to the digital-to-analog converter. will be given feedback. An example of the configuration of one converter is shown in FIG.

When the horizontal address HA and vertical address VA obtained as described above are viewed on the display surface of the cathode ray tube 1, they appear as shown in FIG. In other words, the display surface is addressed using a matrix of horizontal addresses HO-H7 and vertical addresses VO-V9. In FIG. 13, as is clear from FIGS. 10 and 11, the addresses HO, VO, and V9 are in the erasing period including the retrace period, so they are not used for actual image display. The actual image display section is ■1H1
~V8H7 is within the matrix shown by the solid line.

An example of the data format of the color shift correction data memory 231 corresponding to this is shown in FIG. In other words, the data is composed of 16 bits for each address, and each address is divided into 4 bits and sent to each electromagnetic coil 111, 121, 131.
, 141 is stored. The first bit (sign bit SB) of each of these four bits represents the direction of the current, and the next three bits specify one of eight levels of its magnitude. The moving directions of the beams R and B corresponding to the code bit SB:0orl are shown at the bottom of the figure. Also, one unit of the size specified by the second to fourth three bits is approximately 0.1 mm when converted to the amount of movement of the light emitting point on the display surface, for example.
It is assumed that the characteristics of the digital-to-analog converters 241 to 244 and the electromagnetic coils 111, 121, 131, and 141 are determined.

In this way, the color misregistration of the color cathode ray tube with an in-line electron gun can be efficiently corrected to a high quality of about 0.1 mm using the digital data of the color misregistration correction data memory.

Next, a method of setting the above correction data in the memory 231 will be explained. For this purpose, a gate circuit 232 as shown in FIG. 15 is inserted between the horizontal address counter 213, the vertical address counter 221, and the memory 231 in the embodiment shown in FIG. Since the gate 233 in this circuit 232 outputs 1'' only when all the outputs of the counters 221 and 213 are it O'' (address VOHO), it is always it O'' on the effective display surface.
is outputting. Therefore, since the output of the AND gate 234 is "091" in the zone within the effective display surface, the gate 235
is passed through each output of each counter 221, 213, and address designation as described above is performed.

In addition, gates 235, 236 (AND), gate 23
Although the 7 (OR) set is omitted in the figure, it is assumed that each address input is provided with it.

When each counter 221, 213 specifies atLzXVOHO, the output of the gate 233 becomes "1". For example, if a write command WR, write address WA, and write data WD are output from the keyboard, when scanning reaches the VOHO zone, the gate 234 output becomes 111'', each gate 236 turns on, and the write address WA is applied to the address input of memory 231, and data WD is written to the specified address.

Since this writing operation is a period in which zone VOHO is not displayed, no disturbance is caused to the display surface.

Data written in this way is read out during subsequent scanning and affects the display screen as a correction amount for the corresponding zone, so by repeatedly writing data while looking at the screen of the corresponding zone. Optimal correction data can be easily set.

Furthermore, once the optimum value of the color shift correction data is determined for all addresses, the optimum value data can be transferred to FROM and used as the color shift correction data memory of the CRT. It never happens.

In the above embodiment, the effective portion of the display surface is divided into 7 x 8 zones, but the number of divisions can be arbitrarily determined depending on the required accuracy of color matching and the performance of the cathode ray tube device. That's easy.

As is clear from the above embodiments, according to the present invention, the convergence adjustment of a color cathode ray tube with an in-line electron gun arrangement can be easily and accurately performed over the entire display surface, and a clear display image can be obtained. It will be done.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a cathode ray tube image display device to which a conventional technique is applied, Fig. 2 is a diagram showing the structure of a conventional cathode ray tube section, Figs. 3 and 5 are explanatory diagrams of convergence according to the conventional technique, and Fig. 4 is a diagram showing a static convergence magnet, FIG. 6 is a block diagram of a cathode ray tube image display device to which the present invention is applied, FIGS. 7(a), (b), and FIG. 8(a)
,(b). (c) is a diagram showing an example of the configuration of a dynamic convergence correction magnet used in the present invention, FIG. 9 is a diagram showing an embodiment of a color shift correction circuit for realizing the method of the present invention, and FIG.
0 and 11 are explanatory diagrams of the operation of the color shift correction circuit in FIG. 9, FIG. 12 is a diagram showing an example of the configuration of a digital-to-analog converter used in the color shift correction circuit in FIG. 9, and FIG. An explanatory diagram of zone division as a unit of correction on a cathode ray tube display screen. Figure 14 is a diagram showing an example of a data format in memory corresponding to the zone division of Figure 13. Figure 15 is a diagram of a circuit for writing correction data into memory. It is a figure showing an example of composition. 1... Braun tube, 100... Dynamic convergence correction magnet, 200... Color shift correction circuit, 11...
・Electron gun, 12... Display surface, 13... Electron beam,
111.121, 131.141... Electromagnetic coil, 7
1...Horizontal synchronization signal, 72...Vertical synchronization signal, 21
1... Phase comparator, 212... Voltage controlled oscillator, 2
13... Horizontal address counter, 221... Vertical address counter, 222... Frequency division counter, 231.
...Correction data memory, 232...Gate circuit, 24
1,242.243,244...Digital-to-analog converter, HA...Horizontal address, VA...Vertical address.

Claims (1)

[Scope of Claims] 1. In a color shift correction device for a color cathode ray tube of a display device configured to scan a color cathode ray tube in which three electron guns are arranged in-line using a raster scan method, both ends of the electron guns are provided. a first electromagnetic coil for deflecting the two double-ended electron beams outputted from the electron gun in mutually opposite directions in the horizontal direction; and a first electromagnetic coil for deflecting the two double-ended electron beams in mutually opposite directions in the vertical direction. a second electromagnetic coil for deflecting the two electron beams at both ends horizontally in the same direction; and a third electromagnetic coil for deflecting the two electron beams at both ends in the same direction in the vertical direction. A color cathode ray tube device comprising: a fourth electronic coil for dividing a screen into a plurality of zones; and a memory storing current value data of each electromagnetic coil for correcting color shift for each zone. 2. In a color shift correction device for a color cathode ray tube of a display device configured to scan a color cathode ray tube in which three electron guns are arranged in-line using a raster scan method, the output from the electron guns at both ends of the electron guns is a first electromagnetic coil for deflecting the two double-ended electron beams in opposite directions in the horizontal direction; and a second electromagnetic coil for deflecting the two double-ended electron beams in mutually opposite directions in the vertical direction. an electromagnetic coil, a third electromagnetic coil for horizontally deflecting the two double-ended electron beams in the same direction, and a fourth electromagnetic coil for vertically deflecting the two double-ended electron beams in the same direction. An electronic coil is provided, and the color shift is adjusted by first adjusting the horizontal and vertical shifts of the electron beams at both ends by applying current to the first and second electromagnetic coils, and then adjusting the horizontal and vertical shifts of the electron beams at each end. A color shift correction method for a color cathode ray tube device, characterized in that horizontal and vertical shifts between an electron beam and a fixed central electron beam are adjusted by currents flowing through the third and fourth electromagnetic coils.