JPS58105682A - Convergence circuit - Google Patents

Abstract

PURPOSE:To eliminate the necessity of trackings in various lateral adjustments and to simply and accurately compensate lateral dynamic convergences of the horizontal cycle and the vertical cycle, by independently performing the compensation to a prescribed position in each picture. CONSTITUTION:The 1st, 2nd, and 3rd voltages VO, VT and BB from a common voltage generating circuit 10 are added to the 1st, 2nd, and 3rd voltage combining circuits 20L, 20R and 20V, respectively, and the 1st, 2nd and 3rd combined voltages EL, ER and EV of the same horizontal cycle are outputted to the outputs of the combining circuits. The voltages EL and ER are added to voltage generating circuits 30L and 30R which add a horizontal synchronizing signal HS, and the 1st and 2nd correcting voltages HL and HB clamped on the earthing potential are outputted at the mid-point of each horizontal scanning period. Then, the voltages HL and HB are added to a switch 40 and switched in the horizontal scanning period and a lateral dynamic convergence voltage of the horizontal cycle is outputted. Moreover, a lateral dynamic convergence voltage of the vertical cycle is outputted by the voltage EV.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a convergence circuit for a display device using a color cathode ray tube, especially a display device that requires high-quality images such as a graphic display or a data display. ) This allows dynamic misconvergence to be precisely corrected by simple naconvergence adjustment.

Conventionally, the convergence circuit used to correct lateral dynamic misconvergence in monitors such as m-TVs that use in-line color cathode ray tubes has been
It is constructed as shown in FIG.

That is, for correction of lateral dynamic misconvergence in the horizontal period, the horizontal period parabola voltage and sawtooth wave voltage are combined in a combiner/H, and the combined voltage is applied to the convergence coil 3H via the amplifier 2H. By adjusting the amplitude of the parabolic voltage, the left red beam in Figure A can be moved to the left on the screen, and the right red beam can be moved to the right on the screen. , by changing the amplitude and polarity of the sawtooth voltage, between the state in which the left red beam in FIG. 2B is moved inward and the state in which the right red beam is moved outward. Can be adjusted.

On the other hand, for correction of horizontal dynamic misconvergence in the vertical period, the vertical period parabola voltage and sawtooth wave voltage are combined by a combiner/V, and the combined voltage is applied to the convergence coil 3V via the amplifier 2V. By adjusting the amplitude of the parabolic voltage, it can be adjusted between the left and right sides of Figure 2C, and by changing the amplitude and polarity of the sawtooth voltage, it can be adjusted between the left and right sides of Figure 2C. It can be adjusted with

However, in this conventional convergence circuit, as is clear from Figure 2, when correcting the lateral dynamic misconvergence of the horizontal period, one adjustment moves the beam on both the left and right sides of the screen. Tracking is required between the λ adjustments to correct both sides, and for correction of vertical period lateral dynamic misconvergence, one adjustment moves the beam both above and below the screen, so Tracking is required between the two adjustments to correct both sides, making the adjustment significantly more complicated. Moreover, some corners of the screen where two adjustments affect each other cannot actually be corrected.

In view of this point, the present invention provides various types of lateral dynamic
Misconvergence can be precisely corrected in each part of the screen by simple adjustment.

That is, in the present invention, correction of horizontal dynamic misconvergence in the horizontal period can be performed independently at the upper left, center, lower left, upper right, center right, and lower right of the screen, and Horizontal dynamic of the period
Misconvergence correction can be performed independently at the top, center, and bottom of the screen, and both can be used to correct misconvergence at the top left, center, bottom left, top center, bottom center, top right, and center right of the screen. The correction of lateral dynamic misconvergence at point g in the lower right corner can be easily and accurately performed without the need for tracking.
It has been made possible to do so.

FIG. 3 shows an example of the convergence circuit of the present invention, in which the 1st, second and third voltages Vo, VT and VB of the vertical period are obtained from a common voltage generating circuit IO, respectively. That is, the first voltage vO is a negative polarity parabola of the vertical period, which is formed based on the vertical synchronizing signal Vs and clamped to the ground potential from the beginning to the end of the vertical scanning period, as shown in FIG. It is a waveform voltage.

After this seventh voltage Vo is inverted by an inverting circuit //, it is clamped to the ground potential in the middle of the vertical scanning period by a clamp pulse pvc by a clamp circuit /2, and a voltage Vl as shown in Fig. μ is obtained. It will be done. And this voltage V! is supplied to switches /3 and /4', and switches /3 and /4'
1 is switched to the state shown in the figure in the first half of the vertical scanning period and to the state opposite to the state shown in the figure in the second half of the vertical scanning period by the switching pulse Pvs. As a result, as shown in FIG. The voltage is obtained by inverting the waveform in the first half of the vertical scanning period, and the voltage becomes the ground potential in the second half of the vertical scanning period. Also, switch /≠
Therefore, the third J voltage Va becomes the ground potential in the first half of the vertical scanning period, and in the second half of the vertical scanning period, it is the same as the voltage in the second half of the vertical scanning period of the voltage Vr and the voltage of the first voltage Vo in the vertical scanning period. A voltage obtained by inverting the waveform in the latter half and a voltage corresponding to the voltage obtained by inverting the waveform in the latter half are obtained.

Then, a collection of these voltages/second and third voltages Vo.

On the other hand, in the first voltage combining circuit 20L, VT and TB are connected to the first . Second and third amplitude adjusters 2/L, 22
After the amplitudes are adjusted separately in the synthesizer 2 and 23L, they are synthesized by the synthesizer 2 to obtain the first composite voltage EL with the vertical period. , j-th and sixth amplitude adjuster 2/R, u, 2R
and 23R, after which the synthesizer -? 4t
A second composite voltage ER with a vertical period is obtained. Furthermore, 7th. The second and third voltages VO, VT and TB are applied to the seventh voltage in the third voltage synthesis circuit 20V.
After the amplitude is adjusted separately by the g-th and third amplitude regulators 2/V, 22V and 23V, the synthesizer 2≠V synthesizes the
A third composite voltage Ev of vertical period is obtained.

Here, in the first voltage synthesis circuit 2OL, the first. When the second and third amplitude regulators 2/L, 22L, and 23L are set at their midpoints, the first composite voltage EL is a
The voltage becomes a constant potential DC voltage as shown by ll and bl+. First amplitude regulator 2/'l.

If the second amplitude adjuster 22L is moved up and down with respect to the midpoint position while keeping it at the midpoint position, the voltage EL becomes as shown by a12 to a13 in the first half of the vertical scanning period, and the third amplitude adjustment If the voltage sensor 23L is shifted vertically with respect to the midpoint position, the voltage EL becomes as indicated by b1□ to b13 in the second half of the vertical scanning period. There are still 2 second and third amplitude adjusters L.
And while keeping 23L at the midpoint position, shift the first amplitude regulator 2/L above the midpoint position, and the UIX voltage EL is
In the first half of the vertical scanning period, it becomes indicated by 821, and in the second half of the vertical scanning period, it becomes indicated by b21, and conversely, the first
If the amplitude adjuster 2/L is shifted below the midpoint position, the voltage EL becomes as indicated by a3+ in the first half of the vertical scanning period, and becomes indicated as b31 in the second half of the vertical scanning period. The same applies to the second and third combined voltages ER and Ev obtained from the second and third voltage combining circuits 2θR and 2θV.

That is, 1st. For each of the second and third combined voltages Et, ER, and Ev, determine the magnitude at the beginning, middle, and end of the vertical scanning period corresponding to the top, center, and bottom of the screen. Second. The j-th and t-th amplitude regulators 2L, 22R and 2-2 and the 1st. ≠ and the seventh amplitude regulator, 2/L, , 2/R and 2/V and the third . It can be adjusted independently by the fifth and second amplitude adjusters 23L, 23R and 23V. Moreover, the first. The second and third synthetic polymers can be adjusted separately.

The first combined voltage EL obtained from the first voltage combining circuit 2OL is then supplied to the voltage generating circuit 30L, and the amplitude is modulated by the seventh combined voltage Et of the vertical period in a parabolic waveform with a horizontal period. A first correction voltage HL is obtained which is clamped to the ground potential in the middle of the horizontal scanning period. That is, for example, if the composite voltage EL is the current converter circuit 3/
It is converted into a current IL at L, and the current IL is maintained as an integrated current in the three integrating circuits. Here, integrating circuit 3.
2L is constructed by connecting the collector and emitter of a transistor in parallel to a capacitor, and a horizontal synchronizing signal or a flyback pulse is applied to the transistor as a discharge pulse Hs as shown in FIG. Therefore, a horizontally periodic sawtooth voltage CL is obtained across the capacitor, but the amplitude of the sawtooth voltage CL is changed by the current IL from the current conversion circuit J/L as shown in FIG.

That is, the integrating circuit 3.2L has a horizontal period W toothed wave,
A voltage CL whose amplitude is modulated by the first composite voltage EL having a vertical period is obtained. After this voltage Ct is integrated by the next-stage integration circuit 33 and converted from a horizontally periodic sawtooth wave to a parabolic waveform, the voltage Ct is transferred to a clamp circuit 3t and clamped to the ground potential in the middle of the horizontal scanning period by a clamp pulse PHC. As shown in FIG. A correction voltage Ht is obtained.

On the other hand, the second combined voltage ER obtained from the second voltage combining circuit 20R is supplied to the voltage generating circuit 30R, and in exactly the same way, a second combined voltage ER is generated which has a parabolic waveform with a horizontal period and an amplitude with this vertical period. A second correction voltage HR modulated by & clamped to the ground potential in the middle of the horizontal scanning period.
is obtained. The state is as shown in FIG.

And these voltage generation circuits 3θL and ! The first and second correction voltages HL and Ha obtained from the OR are supplied to the input terminals of the switching O and R, and the switching pulse PH8
Therefore, in the first half of the horizontal scanning period, the switch O is switched to the terminal side and the first correction voltage Ht is taken out from its output, and in the second half of the horizontal scanning period, the switch IIO is switched to the terminal R side and the first correction voltage Ht is taken out. The second correction voltage HR is applied to the output.
is taken out.

The voltage El obtained from this switch to is applied to the convergence coil 1. Given to OH.

On the other hand, the third composite voltage Ev obtained from the third voltage composite circuit 20J described above is
The amplifier jOV is used as a misconvergence correction voltage.
to the convergence coil tov.

Note that an electrostatic deflection plate may be used instead of the convergence coil as the horizontal deflection means for convergence, and in that case, the two correction voltages Eo and Ev can be combined and applied to the same deflection plate. can.

In the above circuit, the voltage EH for correcting the lateral dynamic misconvergence of the horizontal period, which is obtained from the switch tO, is obtained from the voltage generating circuit 30L in the first half of the horizontal scanning period, as is clear from FIG. , a horizontally periodic parabolic waveform whose amplitude is the first composite voltage Et of the input to the voltage generating circuit 30L.

The voltage HL modulated by HL is extracted in the first half of the horizontal scanning period from the middle of the horizontal scanning period clamped to the ground potential, and in the second half of the horizontal scanning period, the voltage HL is obtained from the voltage generation circuit 30R. , a parabolic waveform with a horizontal period whose amplitude corresponds to the second composite voltage E of the input of the voltage generation circuit 30R.
The voltage HR modulated by R is extracted at the latter half of the horizontal scanning period with the middle of the horizontal scanning period clamped to the ground potential. That is, the amplitude of the parabolic waveform of the horizontal period of the correction voltage Eo is modulated separately by the first composite voltage EL in the first half of the horizontal scanning period and by the second composite voltage ER in the second half of the horizontal scanning period. It is something that Moreover, as described above, the first and second combined voltage EL
and ER can be adjusted individually. Therefore, by separating the left and right halves of the screen, the horizontal dynamic misconvergence of the horizontal period can be corrected independently on the left and right sides of the screen.

Furthermore, as described above, for each of the first and second combined voltages EL and ER, the period at the beginning of the vertical scanning period corresponding to the top, center, and bottom of the screen.

Since the size of the middle and end periods can be adjusted independently, the horizontal dynamic misconvergence of the horizontal period can be corrected independently at the top, center, and bottom of the screen, respectively, on the left and right sides of the screen. be able to.

That is, in the end, the horizontal dynamic misconvergence of the horizontal period can be corrected independently at six locations: the upper left, the center, the lower left, the upper right, the center right, and the lower right of the screen. FIG. 7 and FIG. g show the state of the adjustment, and as is clearer from FIG. , the beam can be moved at the upper left of the screen as shown in Figure 7A, and by adjusting the first amplitude adjuster K/L, the beam can be moved at the center left of the screen as shown in Figure 7B. The third amplitude adjuster 23L can be moved.
By adjusting , you can move the beam at the bottom left of the screen as shown in Figure C. It's a trench, second voltage synthesis circuit 2
At 0R, if the j-th amplitude adjuster 22R is adjusted,
The beam can be moved at the upper right of the screen as shown in Figure A, and by adjusting the μth amplitude adjuster -2/R, the beam can be moved at the center right of the screen as shown in Figure B. If the t-th amplitude adjuster 23R is adjusted, C
You can move the beam at the bottom right of the screen as shown.

On the other hand, the voltage Ev for correcting the horizontal dynamic misconvergence of the vertical period, which is obtained from the third voltage synthesis circuit 20V, is applied to the upper part of the screen as described above.

a period at the beginning of the vertical scanning period corresponding to the center and bottom;
Since the size of the middle and end periods can be adjusted independently, the horizontal dynamic misconvergence of the vertical period can be corrected independently at the top, center, and bottom of the screen. The figure below shows the adjustment state. In the third voltage synthesis circuit, 20V,
By adjusting the g-th amplitude adjuster 22V, the beam can be moved at the top of the screen as shown in A of the same figure, and by adjusting the seventh amplitude adjuster 2/■, as shown in B of the same figure. The beam can be moved at the center of the screen, and by adjusting the first amplitude adjuster 23V, the beam can be moved at the bottom of the screen as shown in C of the same figure.

In practice, first, the seventh to third amplitude regulators j/V to 23
V to correct the horizontal dynamic misconvergence of the vertical period at the center in the left-right direction of the screen, and then adjust the amplitudes of the first to third amplitude regulators, 2/L-, -23L, and t-th to B-th amplitudes. Adjusters 2/R to 23R can be used to correct horizontal dynamic misconvergence on the left and right sides of the screen. , lateral dynamic misconvergence at locations t in the center right and lower right can be easily and accurately corrected without requiring tracking.

FIG. 1O is a mere illustration of another example of the convergence circuit of the present invention, in which a common voltage generating circuit is connected to the above-mentioned 7.
In addition to the second and third voltages Vo + VT and Va,
In the first half of the vertical scanning period, the voltage is in the form of a half-cycle of a vertical sine wave, and in the second half of the vertical scanning period, the voltage Vs↑ becomes the ground potential, and in the first half of the vertical scanning period, it becomes the ground potential, and the vertical scanning In the second half of the period, a j-th voltage VSB is obtained which is a voltage in the form of the remaining half cycle of the sine wave, and these j voltages Vo + VT + V
This is a case where a + Vst and Vsa are individually amplitude-adjusted by j amplitude adjusters in the first to third voltage synthesis circuits, and then synthesized. According to this, more precise correction becomes possible.

[Brief explanation of drawings]

Fig. 1 is a system diagram of an example of a conventional convergence circuit, Fig. 2 is a diagram for explaining the movement of the beam at various parts on the screen due to this, and Fig. 3 is a connection diagram of an example of the convergence circuit of the present invention. , μ, J, and 3 are diagrams showing the waveforms of each part, and Figures 7, R, and D are diagrams for explaining the movement of the beam at each part on the screen. , FIG. 1O is a diagram showing waveforms of voltages to be synthesized in another example of the convergence circuit of the present invention. In the figure, IO is a common voltage generation circuit, Vol'T and VB are the first, second and third voltages, OL is the first voltage synthesis circuit, -2/L-, 23L are the first, second and third voltages. 1 to 3rd amplitude regulators, EL is the first composite voltage, 2OR is the second voltage composite circuit, j/R-23R is the μth to 6th amplitude regulators, ER is the second composite voltage , 20V is the third voltage synthesis circuit, 2/V-23V is the seventh to third amplitude regulators, E
v is the third composite voltage, 30L and 30R are voltage generation circuits, L and HR are the first and second correction voltages, μO is a switch, 1. OH and 60V are Compazenos Coil Teal. Figure 1 RGE3 RGB E3GRE3GRR
G B BGR BGRRGB RGB BGR Figure 4 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] A first voltage of a parabolic waveform with negative polarity in a vertical period that is clamped to the ground potential at the beginning or end of the vertical scanning period, and a vertical period that is clamped to the ground potential in the middle of the vertical scanning period in the first half of the vertical scanning period. The voltage in the first half of the vertical scanning period is extracted from the voltage of the parabolic waveform of the other polarity, and the second voltage becomes the ground potential in the second half of the vertical scanning period, and the second voltage becomes the ground potential in the first half of the vertical scanning period, In the second half of the vertical scanning period, a third voltage is obtained by extracting the voltage in the second half of the vertical scanning period from the voltage of the parabolic waveform of the other polarity in the vertical period, which is clamped to the ground potential in the middle of the vertical scanning period. A common voltage generation circuit that can obtain the voltage, and the first to 36th voltages are individually amplitude-adjusted by the first to third amplitude regulators, and then combined to obtain a seventh composite voltage with a vertical period. a first voltage synthesis circuit; and a second voltage synthesis circuit in which the first to third voltages are individually amplitude-adjusted by μth to sixth amplitude regulators and then synthesized to obtain a second composite voltage having a vertical period. and a third voltage combining circuit in which the first to third voltages are amplitude-adjusted separately by seventh to third amplitude regulators and then combined to obtain a third combined voltage having a vertical period. and a first correction voltage clamped to the reference potential in the middle of the horizontal scanning period, in which the amplitude of the voltage of the horizontally periodic parabolic waveform is modulated by the first composite voltage. The resulting voltage generation circuit and a second correction voltage clamped to the reference potential in the middle of the horizontal scanning period, in which the amplitude of the voltage of the horizontally periodic parabolic waveform is modulated by the second composite voltage. a voltage generating circuit that outputs the first correction voltage in the first half of the horizontal scanning period, and a switch that outputs the second correction voltage in the second half of the horizontal scanning period, the switch The voltage obtained from the third composite voltage is used as a voltage for correcting horizontal dynamic misconvergence in a horizontal period, and the third composite voltage is used as a voltage for correcting horizontal dynamic misconvergence in a vertical period, respectively. a convergence circuit provided to the horizontal deflection means;