JPS59143244A - Deflecting and correcting circuit for color flat braun tube - Google Patents

Abstract

PURPOSE:To simplify and compact the circuit structure and also to minimize the power consumption, by putting the vertical deflection voltage capable of correcting the circular distortion, the focus correcting voltage, and the convergence correcting voltage into a common circuit configuration. CONSTITUTION:A joint bracket 14 of stainless steel, for example, is provided for the central convergence electrode 2. The joint bracket 14 has a boss to be fitted in the opening of the central cnvergence electrode 2. The vertical deflection voltage to be supplied to the vertical deflection electrode 6, the convergence correcting voltage to be supplied to the outer convergence electrode 3, and the focus correcting voltage to be supplied to the fourth grid G4 are of the same polarity and the average voltage and the amplitudes of the vertical and horizontal sawtooth voltages of each thereof are arranged to be appropriate by resistance ratios. And the voltage difference between the voltage to be supplied to the central convergence electrode 2 (the reference high voltage RHV) and the voltage to be supplied to the outer convergence electrode 3 becomes the convergence voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a deflection and correction circuit for a color flat cathode ray tube that deflects an electron beam not only horizontally and vertically but also in the depth direction.

[Background Art and its Problems] As shown in the first doujinshi, red, green, and evening electron beams (indicated by IA, IB, and IC) are statically directed [fm] by the central convergence electrode 2 and the outer convergence electrode 3, 3
Book electron beam IA, IB.

1C is made to land correctly on the corresponding phosphor on the phosphor surface 4. Reference numeral 5 indicates one of the vertical deflection electrodes made of ferrite, and the vertical deflection electrode 5 provides vertical deflection toward the upper side of the screen, and the horizontal deflection coil (
(not shown) provides horizontal deflection. Further, the deflection in the depth direction is caused by the electric field formed between the fluorescent surface and the back electrode.

Figure 1A shows that the convergence is correct at any position above the center of the fluorescent surface 4, whose width is ±495m and length is ±60m. There is. However, if convergence correction is not performed, misconvergence as shown in FIG. 1B will occur.

WJ1 FIG. 8 shows a case where the convergence is correct at the central lower position ftP. First, in the vertical direction of the screen, the higher the position, the more misconvergence occurs due to overcrossing. Also, it is clear from the misconvergence at the lower position bow on the left side that when the electron beam is deflected to the left and right, three electron beams from the output lower part of the vertical deflection electrode 5 to the point where it lands on the fluorescent surface 4. Since the flight distances of the two are equal to each other, misconvergence occurs due to the difference in the ejection position. At the same time, the horizontal deflection causes the crossing point to draw a circular locus, resulting in misconvergence in which the electron beam crosses in the front. Furthermore,
Due to the difference in the emission positions of the side beams IA and IC with respect to the center beam 1B (which is extremely small), the landing state of the three electron beams looks like a goat's footprint.
The misconvergence of the Yagiashi pattern is a real hit.

Also, as with black and white flat cathode ray tubes, correction of deflection distortion is required. As shown in FIG. 2, the deflection distortions include arcuate distortion 21 in which the horizontal scanning line curves, and keystone distortion 22 in which the upper side of the screen becomes wider than the lower side. Furthermore, since the distance from the lens position of the electron gun is different in the vertical direction of the screen, defocus occurs at the top and bottom of the screen, so a dynamic 7 orcus is required.

1.Object of the invention-1. The object of the present invention is to provide a deflection and correction circuit for a color flat cathode ray tube, which performs vertical deflection, correction of deflection distortion, convergence correction, and focus correction, and can share five circuits. be.

Furthermore, Jin's invention does not require signal waveforms of opposite polarity for deflection and correction, thereby reducing power consumption and simplifying the circuit configuration.

Embodiment J FIGS. 3A and 3B show the structure of a color flat cathode ray tube in an embodiment of the present invention.

In FIG. 3, 4 indicates a fluorescent surface, 8 indicates a back electrode, and 9 indicates an aperture grill. - As an example, the fluorescent surface 4 and the aperture grille 9 may have Icj'8CK
A high voltage HV of VJ is applied, and a reference high voltage RHv of, for example, 4.77 (KV) is applied to the back electrode 8.

Further, numerals 5 and 6 indicate upper and lower vertical deflection electrodes made of ferrite plates, respectively. Horizontal deflection coils 12 and 13 are arranged outside the vertical deflection electrodes 5 and 6. Additionally, a cathode IOA generates red, green, and blue electron beams.
, 10B, IOC, first grid GI and second grid G
A central convergence electrode 2, an outer convergence electrode 3, and a rotation coil 11 are provided for convergence correction.

In this unipotential system, the second grid G2
constitute a prefocus lens together with the third grid G3, and the third grid G3. The fourth grid G4 and the fifth grid G5 constitute a main and in-7 orcus lens.

Further, horizontal deflection coils 12 and 13 are arranged so as to be located before and after the eccentric deflection electrodes 5 and 6.

Furthermore, a joy/dead bracket 14 made of stainless steel, for example, is provided to the central convergence electrode 2. This joint bracket 14 has a boss that fits into the opening of the central convergence electrode 2. The height of the opening formed in this joint bracket 14 through which the electron beams 1A, 1B and IC pass is slightly smaller than the height of the opening on the beam incidence side of the vertical deflection electrodes 5 and 6. . This is the upper vertical deflection electrode 6
This is to prevent the potential of the vertical deflection electrode 6 from fluctuating due to the collision of the electron beam with the electron beam, thereby preventing the landing position 14 of the electron beam from being disturbed.

FIG. 4 shows a circuit configuration of an embodiment of the present invention. Fourth
In the figure, 31 indicates a vertical periodic voltage generation circuit 5 This vertical periodic voltage generation circuit 31 generates a vertical periodic sawtooth wave from a sawtooth wave generation circuit 32, as shown in FIG.
The parabolic wave of the horizontal period from the parabolic wave generation circuit 33 is added by the adding circuit 34, and the added output is sent to the amplifier circuit 35.
The configuration is such that the output signal is taken out to the output terminal 36 via.

The sawtooth wave generation circuit 32 generates a sawtooth wave whose amplitude gradually decreases from the top to the bottom of the screen, as shown in the sixth doujinshi. Further, as shown in FIG. 6B, the parabolic wave generation circuit 33 generates a parabolic wave voltage that is modulated in a horizontal period and in a vertical period such that the amplitude increases from the top to the bottom of the screen. do. Then, from the adder circuit 34, as shown in FIG. It will be served.

As shown in FIG. 4, a series circuit of resistors 37, 38, and 39 is inserted between this output terminal 36 and ground. Further, the output terminal 36 of the vertical periodic voltage generation circuit 31 is connected to the capacitor 4.
0 as the terminal 43. Also, resistor 31
and 38 and the connection points of resistors 38 and 39 are connected to output terminals 44 and 45 via capacitors 41 and 42, respectively.
It is derived as

Further, the reference high voltage RHV is supplied from the terminal 46 to the central convergence electrode 2. Vertical deflection electrode5. The back electrode is supplied to the 8° joint bracket 14, and this reference high voltage RHv or its resistance divided voltage is supplied as the average potential of the vertical periodic voltage appearing at the terminals 43, 44° 45.

A resistor 47 is inserted between the terminal 46 and the terminal 43, and a vertical deflection voltage whose average potential is the reference high voltage R)lv is supplied to the vertical deflection electrode 6. Further, a series circuit of resistors 4B, 49.50 and variable resistor 51 is inserted between terminal 46 and ground. A connection point between the resistors 48 and 49 is connected to the terminal 45 and also to the outer convergence electrode 3. A connection point between resistors 49 and 50 is connected to terminal 44 and also to fourth grid G4.

The vertical deflection voltage supplied to the vertical deflection electrode 6, the convergence correction voltage supplied to the outer convergence electrode 3, and the focus correction voltage supplied to the fourth grid G4 have the same polarity as shown in FIG. 6C. In this case, the average potential, the amplitude of the vertical sawtooth wave voltage, and the horizontal sawtooth wave voltage are made appropriate depending on the resistance ratio.

The correction voltage waveform appearing at the terminals 44 and 45 becomes a waveform whose protruding whiskers are rounded by the time constant circuit as shown in Fig. 7, but the roundness of this waveform is small, and the horizontal block Since this corrupted part can be contained within the ranking period TB, it is not a problem at all.

The arc distortion can be corrected by the horizontal parabolic wave of the vertical deflection voltage. Since the amount of arcuate distortion is different at the top and bottom of the screen, the amplitude of the superimposed horizontal parabolic wave is said to change in V cycles.

Keystone distortion can be corrected by modulating the amplitude of the horizontal deflection current with a vertical period.

In addition, the voltage supplied to the central convergence electrode 2 (
The voltage difference between the reference high voltage RHV) and the voltage supplied to the outer convergence electrode 3 becomes the convergence voltage.

A convergence correction voltage is generated in the outer convergence electrode 3, with the waveform shown in FIG.

Due to the vertical sawtooth wave component of the convergence correction voltage, the convergence voltage is reduced at the upper side of the screen, and the misconvergence of the null over cross is greatly corrected at #1 at the upper side of the screen. Convergence correction voltage 1) The horizontal parabolic wave component reduces the convergence voltage when the electron beam is deflected to both sides of the screen. However, the amplitude of this horizontal parabolic wave changes with a vertical period. Such horizontal parabolic waves can correct misconvergence in the horizontal direction. Misconvergence occurs on both sides of the screen due to the difference in the emission position of the electron beam,
Correction of the misconvergence of the goatee pattern at the central position is performed as described below.

Furthermore, the focus deviation that occurs due to the difference in distance from the position of the electron gun lens in the vertical direction of the screen can be corrected by supplying the focus correction voltage with the waveform of the same machine as in Figure 6C to the fourth clip G4. Corrected.

Next, the rotation coil 1 is wound around the neck part in the vicinity corresponding to the third grid G3 to the fourth grid G4.
The convergence m positive due to 1 will be explained. As described above, when the electron beam is deflected to both sides, misconvergence occurs due to a horizontal shift in the emission position of the electron beam. This Miss Convergence,
X Carrow Corrected by the chision coil 11.

The color flat plaque/tube in this example
Since the configuration is such that the three electron beams intersect in the grid G4, as shown in FIG. No electromagnetic force is generated, but upward and downward electromagnetic forces are generated for the two side beams whose trajectories are in opposite directions and different from the tube axis direction. This electromagnetic force causes the heights of the three electron beams to differ when they are incident on the vertical deflection electrodes 5 and 6.

In the case of FIG. 1B, when the electron beam is deflected to the left, a misconvergence occurs in which the landing position of the electron beam 1A is too far and the landing position of the electron beam 1C is too close.

Furthermore, when the electron beam is deflected to the right, this relationship is reversed. Therefore, as shown in FIG. 9, on the left side of the screen, the deuteron beam 1A is lowered and the electronic beam
beam 1B is raised and incident on vertical deflection electrodes 5 and 6,
On the right side of the screen, on the contrary, the position of incidence on the electron beam 1 is raised, and the position of incidence of the electron beam on the IC is lowered.

In this way, by controlling the height of the incident position of the electron beam with respect to the vertical deflection electrode, misconvergence due to the difference in the emission position can be corrected.

In the vertical direction, at the top of the screen, the flight distance of the electron beam becomes longer, and the difference in the emission position becomes relatively negligible, so there is no need to correct misconvergence by the rotation coil 11. The closer it is to the side, the larger the correction amount needs to be. With respect to the horizontal direction of the screen, on the left side of the screen, the correction current is negative, and on the right side, the correction current is positive.

This correction current in the horizontal direction is formed as a correction current 1 with a horizontal period as shown in the 10th prisoner. Correction current 1. r, t, as shown in FIG. 10B, can be obtained by combining the horizontally periodic sine wave current 12 and the sawtooth p wave 1d current I3.

FIG. 11 shows a correction current generation circuit for the rope John coil 11. In the same figure, t6-[,61
indicates a current generating circuit that generates a horizontally periodic sine wave current I2, and 62 indicates a current generating circuit that generates a horizontally periodic sawtooth wave current I3. These current generating circuits 61 and 6
2, a vertical period correction voltage is supplied from the voltage generating circuit 63 as a power supply voltage, and the amplitudes of the sine wave current I2 and the sawtooth p-wave 1-9 current I3 are modulated.

The sine wave current I2 is supplied to the coil of the orthogonal transformer 66 via the capacitor 64, and the zeta wave current I3 is supplied to the rotation coil 11 via the capacitor 65 and the coil 4 of the orthogonal transformer 66. Ru. Coils L2 and L3, which are electromagnetically coupled to coils L1 and L4 of this orthogonal transformer 66, constitute a closed circuit together with a resonance capacitor C.The resonant frequency of the resonance circuit consisting of the coils L2, L3 and capacitor C is horizontally scanned. chosen to be equal to the frequency.

The sine wave current flowing through the coil L1 of the orthogonal transformer 66 and the pulse wave current flowing through the coil L4 cause a current to flow through the coils L2 and L3, forming a resonant circuit, so the current waveform is a sine wave. becomes.

By coupling the coils L3 and L4, a combined correction current flows through the rotation coil 11 as shown in FIG. 12.

As mentioned above, the first
By supplying the correction current shown in FIG. 2, it is possible to correct misconvergence due to the difference in emission position. In addition, as a correction current, a sawtooth wave current I3 with a horizontal period is used.
Even if you use , you will be able to correct the nominal miscomparison to some extent.

The rotation coil 11 described above cannot correct the misconvergence of the goat's foot pattern in which the landing positions of the id beams shift in the same direction.

The goat's-leg pattern occurs because the emission position of the nide beam is shifted from the center beam. Therefore, as shown in FIG. This can be corrected by placing the position slightly higher than the center beam IB.

FIG. 14A shows an example of means for correcting the goatee pattern. In this example, convergence 1 [2 and 3 are formed in a V-shape, and the upward force is applied to one side
This takes advantage of the fact that A and IC are exhausted by four. ,.

Further, as shown in FIG. 14B, the magnet 61'5ce that generates the correction magnetic field, the outer convergence electrode 11 and the pole 3 are made of nickel, and the outer surface of the central convergence electrode 2 is coated with a magnetic barrier material 68 such as permalloy. Accordingly, the correction magnetic field may act only on the side beams IA and 1C, and the positions of these may be raised. Wc
The opening angle of the convergence electrodes 2 and 3 in FIG. 14A and the strength of the correction magnetic field 76 in FIG. 14B are determined according to the design of the color flat cathode ray tube.

The correction current for the rotation coil 11 described above is
Like the horizontal deflection current, it is at a large level reaching about 600 mA, so it is necessary to use a circuit that can withstand high power as a circuit for generating this correction current. In consideration of this point, a circuit that generates a correction current using a horizontal deflection current is preferable.

FIG. 15A shows the horizontal f-th direction nt current supplied to the horizontal deflection coil 12.13. The amplitude of this horizontal deflection current is increased at the bottom of the screen to correct Gieston distortion.

A rotation coil 11 is connected in series with this horizontal deflection coil 12, 13. Further, a canceling coil is provided in association with the rotation coil 11.

As shown in FIG. 16, the rotation coil 11 is wound in sections around a winding frame 16 that fits into the reference portion of the cathode ray tube, and a canceling coil 15 is wound around the center of the rotation coil 11. As shown in FIG. 17, the canceling coil 15 may be wound over the rotation coil 11. The magnetic flux generated by the key IP/cell coil 15 cancels the magnetic flux generated by the rotation coil 11.

A canceling current as shown in FIG. 15B is supplied to the canceling coil 15. Furthermore, since the horizontal deflection current (FIG. 15A) is supplied to the rotation coil 11, the effect is substantially the same as that of supplying the correction current shown in FIG. 15C to the rotation coil 11. given to the electron beam. Therefore, convergence correction can be performed in the same manner as described above. Also,
The large amplitude current is generated by the horizontal deflection circuit.
Since it is sufficient to form a canceling current with a small amplitude to be supplied to the canceling coil 15, circuit design becomes easier.

[Effects of the Invention] According to the present invention, a vertical deflection voltage capable of correcting circular distortion, a focus correction voltage, and a convergence correction voltage can be formed by a common circuit configuration. Therefore, the circuit configuration can be simplified and downsized, and power consumption can also be reduced.

[Brief explanation of the drawing]

Fig. 1 is a route diagram used to explain misconvergence of color flat cathode ray tubes, Fig. 2 is a route diagram used to explain deflection distortion, and Fig. 3 is a plan view showing the configuration of a color flat cathode ray tube to which this invention is applied. and a sectional view, FIG. 4 is a connection diagram showing the configuration of an embodiment of the present invention, FIG. 5 is a block diagram showing the configuration of a vertical periodic voltage generating circuit according to an embodiment of the invention, and FIG. 7 is a waveform diagram used to explain the vertical periodic voltage, FIGS. 8 and 9 are route diagrams used to explain the miscomparison caused by the difference in the emission position of the electron beam, and FIGS. 10, 11, and Fig. 12 shows the correction current supplied to the rotation coil, a waveform diagram used to explain the formation of the current, a connection diagram of its generation circuit, and a waveform diagram of the correction current, and Figs. 13 and 14 show the miscompurge of the goat pattern. A route map used to explain the 1st correction, an example of this correction means, a configuration diagram showing another example, Figs. 15 and 16
17 are a waveform diagram used to explain another example of formation of the correction current supplied to the rotation coil, an example of its configuration, and a sectional view showing the configuration of another example. IA, IB, IC・・・・・・・・・Electron beam, 2・・・・・・・・・・・・Central convergence 11
[, 3......Outer convergence' depolarization, 4...... Fluorescent surface, 5, 6...
・・・・・・・・・Vertical deflection electrode, 8・・・・・・・・・
・・Back electrode, 11・・・・・・・・・・Rotation coil, 12.13・・・・・・・・・・Horizontal f
fi muko, il, 14......jo f
mount bracket, 31... Vertical periodic voltage generation circuit, 40, 41.42...
... Capacitor, 48.49, 50.51...
·····resistance. Agent Tadashi Sugiura Figure 1 A B Figure 3 Figure 2 21 Figure 4

Claims (1)

[Scope of Claims] An electron gun located substantially on an extension of the color fluorescent surface, a back electrode facing the color fluorescent surface, and an opposing arrangement located between the color fluorescent surface and the electron gun. In a color flat cathode ray tube having a vertical deflection means consisting of two vertical deflection electrodes, and a horizontal deflection coil provided outside the vertical deflection means, the vertical deflection electrodes include -10,000 convergence electrodes. A resistor circuit supplies the DC voltage supplied to the back electrode with a predetermined level relationship to the other convergence electrode and focus electrode, and a horizontally periodic parabolic wave voltage is superimposed on the vertically periodic sawtooth wave voltage. A vertical periodic voltage generating circuit generates a first vertical periodic voltage having a predetermined level relationship. A resistor circuit for converting into a second and third vertical periodic voltage, one of the vertical deflection electrodes, one of the convergence electrodes, and the focus electrode is connected to the first. Second. A deflection and correction circuit for a color flat cathode ray tube, comprising a capacitor that supplies a third vertical periodic voltage in an AC-coupled manner.