JP2992288B2 - Display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention
Display with a horizontal deflection circuit that can handle
Ray device. [0002] 2. Description of the Related Art Used in general televisions and displays.
Horizontal deflection circuits have good horizontal linearity.
Therefore, linearity correction is performed. Figure 2 shows the Lini
Conventional water with linearity correction by arity coil
FIG. 2 shows a circuit diagram of a flat deflection circuit. In FIG. 2, 1 is water
Flat sync signal input terminal, 2 is horizontal oscillation circuit, 3 is horizontal deflection
Drive circuit, 4 is horizontal output transistor, 5 is damper
Diode, 6 is a resonance capacitor, 7 is a horizontal deflection coil
, 8 is a linearity coil, 9 is an S-shaped capacitor, 1
0 is the choke coil (or flyback transformer)
Reference numeral 11 denotes a power supply terminal. [0003] Using the horizontal deflection circuit shown in FIG.
Keep the horizontal deflection frequency while keeping the screen size and brightness constant.
To display different numbers of image signals, the horizontal deflection frequency
The amplitude of the horizontal deflection current becomes constant in response to the number change
Current voltage E_BMay be automatically adjusted. Related to this
The conventional technology that uses a saturable reactor
It is described in JP-A-58-157260. [0004] However, this is not the case.
In such prior art, the horizontal deflection frequency changes
The problem that the horizontal linearity also changed occurred. Less than
The cause of such a phenomenon will be described below. FIG. 3 shows a horizontal deflection output circuit during a scanning period.
3 shows an equivalent circuit of a road. In FIG. 3, reference numeral 12 denotes a horizontal bias.
Directional coil, 13 is the internal resistance (horizontal deflection coil resistance,
And ON resistance of output transistor and damper diode
14 indicates a switch, and 15 indicates a power supply.
You. In the circuit shown in FIG. 3, at time t = 0, switch 1
4 is closed, the current i₀At time t
It can be represented by the following equation as a function. [0006] (Equation 1) In the equation (1), E is the power supply of the power supply 15.
, R is the resistance value of the internal resistor 13, τ is the time constant,
From the resistance R and the inductance L of the horizontal deflection coil 12, [0008] (Equation 2) Can be expressed as Therefore, the current i₀Is the dotted line in FIG.
The waveform becomes as shown by. On the other hand, when the internal resistance R = 0 (horizontal
Ideal horizontal deflection circuit without linearity degradation), Figure
Current i flowing through the circuit shown in FIG.₁Is a function of time t
hand, [0010] (Equation 3) And the waveform shown by the solid line in FIG.
Become. Therefore, the scanning period is T_HDThen
Maximum amplitude of ideal horizontal deflection current in the presence of partial resistance R
I_DY, And the ideal horizontal deflection current when the internal resistance R = 0.
Maximum amplitude I₁Can be expressed by the following equation. [0012] (Equation 4) On the other hand, horizontal linearity on the screen
Displays vertical lines on the screen, and
From the vertical line spacing. But,
Here, for convenience, an index indicating the deterioration of horizontal linearity
As LIN, [0014] (Equation 5) Is defined. This index LIN is an ideal value of the internal resistance R = 0.
For the horizontal deflection current, the water when the internal resistance R exists
This value indicates how much the flat deflection current has decreased.
When flat linearity is good, it is close to 0% and horizontal linear
The lower the degree, the higher the numerical value. Substituting equations (4) and (5) into equation (6)
Thus, the index LIN can be expressed as follows. [0016] (Equation 6) From the equation (7), the index LIN is equal to the scanning period T._HD, Horizontal deflection
Determined by the coil inductance L and internal resistance R
Recognize. Next, when the horizontal deflection frequency changes,
Calculation result of how the above-mentioned index LIN changes
Is shown in FIG. In this calculation, the resolution is 1000 × 100
Non-interlaced color display of about 0 dots
Horizontal deflection coil (inductance L = 120μH)
Target, internal resistance R = 1.0Ω, horizontal deflection frequency f_H
= 64 KHz. From the calculation results shown in FIG. 5, the same horizontal deflection is obtained.
By changing the power supply voltage using a coil,
When image signals with different deflection frequencies are displayed, horizontal
The lower the deflection frequency, the lower the horizontal linearity.
I understand. On the other hand, the conventional horizontal bias shown in FIG.
When a bidirectional circuit is used, horizontal linearity adjustment is
This is performed using the arity coil 8. And this re
Correction amount of horizontal linearity by nearity coil 8
Is optimally tuned at a single frequency. But
Therefore, as described above, with the change in the horizontal deflection frequency,
The problem that horizontal linearity changes to the left and right asymmetric
Occurs. On the other hand, a conventional technique for correcting horizontal linearity
The technique is disclosed in JP-A-58-157260.
As is known, a method using a saturable reactor is known.
However, following the change in the horizontal deflection frequency, the horizontal linear
Is not taken into account for optimal adjustment
Was. An object of the present invention is to control the change in the horizontal deflection frequency.
Display devices with a horizontal deflection circuit that can follow
The horizontal deflection circuit changes when the horizontal deflection frequency changes.
The linearity of the horizontal deflection characteristic is the resistance component of the horizontal deflection circuit
To correct for left and right asymmetric deterioration due to
Keeping arity good. [0022] [MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
The present invention supports input signals with different horizontal deflection frequencies.
With a horizontal deflection circuit that can generate a horizontal deflection current
In the spray device, the horizontal deflection circuit includes a horizontal output circuit.
Force transistor 4 and parallel to the horizontal output transistor 4
Connected damper diode 5 and the damper diode
A resonance capacitor 6 connected in parallel to the
Capacitor connected in parallel with the horizontal deflection coil 7
Connected in series with coil means 8 for correcting nearness
Series circuit and inductance of the coil means 8
Control means 16, 17, 21 for variably controlling characteristics;
And the inductance characteristic of the coil means 8 is water
The flat deflection current is supplied through the horizontal output transistor 4 to the
Said damper diode 5
Through the series circuit via the
And the control means 16,
17 and 21 indicate that when the horizontal deflection frequency changes, the horizontal deflection
The current flows through the series circuit through the damper diode 5.
Value of the coil means 8 when flowing through
From the horizontal output transistor 4 through the horizontal output transistor 4.
Than the inductance value when flowing in the series circuit
Control is performed so as to greatly change. Further, according to the present invention, the control means 16, 1
Reference numerals 7 and 21 denote horizontal deflection in the display device.
As the frequency changes in the higher direction, the horizontal deflection current
When the current flows through the series circuit through the diode 5
The inductance value of the coil member 8
Current flows through the horizontal output transistor 4 to the series circuit.
The inductance value when flowing through
Control so that (Function) Inductance characteristics of the coil means 8
The control means for variably controlling the characteristics includes a correction signal generation circuit.
16 and a correction signal output circuit 17
A circuit 61 and a control winding transformer-coupled to the means 8 for obtaining
A correction signal corresponding to the horizontal deflection frequency.
Power. The correction signal generation circuit 16 is a frequency-voltage conversion circuit
26 to detect changes in the horizontal deflection frequency
A voltage corresponding to the plane deflection frequency is output as a correction signal.
The correction signal output circuit 17 is controlled based on the correction signal.
The control current of the winding 21 is controlled, and the linear deflection of the horizontal deflection current is controlled.
The tee correction amount is changed. Inductance of coil means 8
The horizontal deflection current passes through the horizontal output transistor 4
Through the damper diode 5 than when flowing
When the current is flowing, the inductance value becomes larger.
Shows linearity. The control means changes the horizontal deflection frequency
And the horizontal deflection current of the coil means 8 is a damper diode
The horizontal deflection of the inductance value when flowing through
When current flows through the horizontal output transistor 4,
Control is performed so as to be larger than the conductance value. did
Therefore, in response to changes in the horizontal deflection frequency, the horizontal linear
Quality can be kept good. [0025] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Will be described. In each figure, those that perform the same function are:
Show the same numbers. FIG. 1 shows a first embodiment of the present invention.
It is a principle diagram of a horizontal deflection circuit showing an example. In this circuit,
Compared with the conventional horizontal deflection circuit shown in FIG.
A complementary circuit composed of a raw circuit 16 and a correction signal output circuit 17
The positive signal supply circuit 61, the linearity coil 8 and the transformer
In that the control winding 21 is
You. In the circuit shown in FIG.
In the generation circuit 16, in response to the change in the horizontal deflection frequency,
The generated correction signal is changed, and the correction signal output circuit 17
Is based on the correction signal generated by the correction signal generation circuit 16.
In this case, a control current is supplied to the control winding 21. And
The control current flowing through the control winding 21 causes the linear
Changing the variable range of the inductance of the tee coil 8
I have. This function can respond to changes in the horizontal deflection frequency.
Change the horizontal linearity correction amount
It tries to maintain horizontal linearity. Next, a horizontal deflection output surrounded by a dotted line in FIG.
A specific circuit of the circuit 18 will be described. FIG.
Circuit diagram of a first specific circuit of the horizontal deflection output circuit 18 in the middle
It is. In this circuit, 21 is a linearity coil
A control winding transformer-coupled to 8, a diode 22;
23 is a capacitor, 24 is a resistor, 25 is a transistor,
26 is a frequency voltage conversion circuit (hereinafter referred to as an FV converter).
). The operation of the circuit shown in FIG. 6 will now be described with reference to FIG.
A description will be given in comparison with a conventional horizontal deflection circuit. First, in FIG.
In the conventional horizontal deflection circuit, the linearity coil 8
Flat deflection current I_DYFlows through the damper diode 5
The horizontal deflection current I
_DYIs flowing through the output transistor 4,
Ductance is small. And this Induct
The variable range of the inductance is constant even if the horizontal deflection frequency changes
It is. In contrast, the circuit shown in FIG.
The variable range of the inductance of the
21 by controlling the current flowing through
You. Specifically, the current flowing through the control winding 21 is increased.
The inductance of the linearity coil 8
The variable range becomes smaller. Conversely, the current flowing through the control winding 21
Is reduced, the inductance of the linearity coil 8 is reduced.
The variable range of the source becomes wider. According to this principle, as shown in FIG.
In the circuit, the change of the horizontal deflection frequency is
26, based on the output voltage of the FV converter 26.
Controlling the collector current of the transistor 25.
You. Therefore, by the operation of the transistor 25,
The value of the control current Ia flowing through the control winding 21 is changed.
You. For example, when the horizontal deflection frequency is high, F-
Set the output voltage of the V converter 26 to be high.
If this is the case (if the horizontal deflection frequency is high), the control winding
The control current Ia flowing through 21 increases. Therefore, Lini
The variable range of the inductance of the arity coil 8 is not narrow.
Therefore, the correction amount of the horizontal linearity is small. Conversely, horizontal deviation
When the directional frequency is low, the output voltage of the FV converter 26
, The control current Ia flowing through the control winding 21 is
Less, variable inductance of linearity coil 8
The range becomes wide, and the correction amount of the horizontal linearity is large. FIG. 10 is a circuit diagram of the linear circuit shown in FIG.
FIG. 4 is a diagram showing a DC superimposition characteristic of the power coil 8. In addition,
The DC bias characteristic of the linearity coil 8 is based on horizontal deflection.
Frequency f_HHorizontal deflection that can handle from 32KHz to 64KHz
This is the value designed for the circuit. In this figure, the dotted line indicates horizontal deflection
If the frequency is high (f_H= 64 KHz)
And the solid line indicates the horizontal deflection frequency f_HIs low (f_H=
32 KHz). As shown in FIG.
In the circuit, as shown in FIG. 10, the horizontal deflection frequency f
_HOf the linearity coil 8 in response to the
Tance L₁Of the horizontal linearity
The correction amount is increased or decreased. Therefore, the circuit shown in FIG.
In the road, even if the horizontal deflection frequency changes,
In response, it is possible to always maintain good horizontal linearity.
Become. FIG. 7 shows a horizontal deflection output surrounded by a dotted line in FIG.
FIG. 3 is a circuit diagram of a second specific circuit of the power circuit 18. This figure
, 27 is a photocoupler, 28 is a transistor,
29 is a resistor. In the circuit shown in FIG.
Control current I flowing through line 21_aIs controlled by the photocoupler 27
I control Also in this case, similar to the circuit shown in FIG.
Compensates for horizontal linearity in response to changes in horizontal deflection frequency.
Keep the horizontal linearity good by changing the positive amount.
Can be. FIG. 8 shows a horizontal deflection output surrounded by a dotted line in FIG.
FIG. 9 is a circuit diagram of a third specific circuit of the power circuit 18. This figure
, 30 is a capacitor, 31 is a variable resistor, and 32 is
Resistance. In the circuit shown in FIG.
Instead of detecting the number directly with an FV converter
In addition, the power supply voltage E that changes according to the horizontal deflection frequency_BTo
Detected and used as a correction signal. When using this circuit
Also, as with the circuit shown in FIG.
The horizontal linearity correction amount is changed correspondingly to
The nearness can always be kept good. FIG. 9 shows a horizontal deflection output surrounded by a dotted line in FIG.
FIG. 9 is a circuit diagram of a fourth specific circuit of the power circuit 18. This figure
, 33 is an operational amplifier, 34, 35, 37, 38
Is a resistor, and 36 is a capacitor. In the circuit shown in FIG.
Causes a change in the horizontal deflection frequency in the S-shaped capacitor 9
The voltage is detected by the change. However, S-shaped conden
Since the voltage generated at the sensor 9 has a parabolic waveform,
Operational amplifier 33, resistors 34, 35, 37, 38, condensate
AC component by low-pass filter
Has been removed. The circuit shown in FIG. 6D was used.
In this case, as in the circuit shown in FIG.
Change the correction amount of horizontal linearity according to the change,
Horizontal linearity can always be kept good. FIG. 11 shows a second embodiment of the present invention.
It is a principle diagram of a flat deflection circuit. In FIG. 11, 39 is water
Flat blanking signal input terminal, 40 is a deflection yoke, 41
Is an auxiliary coil. Hereinafter, the operation of the circuit shown in FIG.
Will be described. This circuit corrects horizontal linearity.
In this case, an auxiliary coil 41 is used. Features of this circuit
Is the correction current i flowing through the auxiliary coil 41_GHorizontal deflection of waveform
Change the horizontal linearity correction amount according to the frequency
Is increasing or decreasing. Then, the above correction current i
_GIs supplied from the correction signal supply circuit 61. This correction
FIG. 12 is a circuit diagram of a specific circuit of the signal supply circuit 61.
You. In FIG. 12, 45 is an input terminal and 46 is
Output terminals, 49, 53, 54, 58 are transistors, 4
8, 56 are capacitors, 47, 50, 51, 52, 5
5 and 57 are resistors. The circuit shown in FIG.
An inverting amplifier circuit including a transistor 49 and a resistor 50;
Transistor 53, transistor 54, resistor 51, resistor 5
2, a constant current circuit including a resistor 55, a transistor 58,
A voltage-current conversion circuit comprising a resistor 57.
You. The circuit shown in FIG.
Horizontal blanking signal is inverted by the inverting amplifier circuit.
After amplification, the constant current circuit and the capacitor 56
It produces a sawtooth wave voltage. And the voltage-
After converting to sawtooth current by the current exchange circuit,
From the power terminal 46 to the auxiliary coil 41 in FIG.
You. The advantage of the circuit shown in FIG.
Generated by the frequency of the horizontal blanking signal
That is, the amplitude of the generated sawtooth wave changes. FIG. 13 shows the voltage V in FIG.₄₅,Voltage
V₄₉, Current i_GThe waveform is shown. In this FIG.
(A), (b) and (c) are for a horizontal deflection frequency of 6 KHz.
(D), (e) and (f) are horizontal deflection circumferences.
The case where the wave number is 32 KHz is shown. In FIG.
Correction current i when horizontal deflection frequency is 64KHz_GThe amplitude of I
_G1Current i when the horizontal deflection frequency is 32 KHz_GAmplitude
To I_G2Then I_G2$ 2I _G1Holds. This is the figure
In step 12, when generating a sawtooth wave, a capacitor
This is because 56 is charged with a constant current. Therefore,
By using the circuit shown in FIG.
When the number changes from 64KHz to 32KHz, the horizontal linear
The correction amount of the tee increases about twice. On the other hand, from FIG. 5, the horizontal deflection frequency f_H= 3
The horizontal linearity at 2 KHz is the horizontal deflection frequency f_H
= About 2 times worse than horizontal linearity at 64KHz
You can see that Therefore, using the circuit shown in FIG.
And the horizontal linearity is determined by the horizontal deflection frequency f_H= 32KH
z, or horizontal deflection frequency f_H= Either 64KHz
If the horizontal deflection frequency f
_H= 32 KHz, the horizontal deflection frequency f_H= 64KHz
Even if the horizontal linearity can always be kept good
Wear. FIG. 14 shows a third embodiment of the present invention.
It is a principle diagram of a flat deflection circuit. Hereinafter, the circuit shown in FIG.
Explain the function of. This circuit compensates for horizontal linearity.
In order to perform the correction, the correction signal is superimposed on the capacitor 9 at S time.
I have. The feature of this circuit is that
The positive signal waveform is changed according to the horizontal deflection frequency,
That is, the correction amount of the linearity is increased or decreased. Soshi
The correction signal is supplied from the correction signal supply circuit 61.
It is. The specific circuit of the correction signal supply circuit 61
FIG. 15 shows a circuit diagram. In FIG. 15, it is surrounded by a dotted line.
The correction signal generation circuit 16 is the circuit described in the second embodiment.
The same one (see FIG. 12) was used. Also, the correction signal output
The power circuit 17 includes transistors 62, 66, 68, 69,
Resistors 63, 64, 65, 70, 71, capacitors 67,
An amplifying circuit composed of 72 is used. And this
In the amplifying circuit of FIG.
Amplify the signal and drive the S-shaped capacitor 9 in FIG.
Working. By using the circuit shown in FIG.
In response to changes in the horizontal deflection frequency, the horizontal linearity
Increase or decrease the amount of correction to keep horizontal linearity always good
be able to. FIG. 16 shows a fourth embodiment of the present invention.
It is a principle diagram of a flat deflection circuit. The circuit shown in FIG.
Compared to the embodiment (FIG. 11), the correction signal generation circuit 16
It is configured by a sawtooth wave generation circuit 43 and an integration circuit 74.
Is different. The correction signal shown in FIG.
FIG. 17 is a circuit diagram of a specific circuit of the supply circuit 61. FIG.
7, the sawtooth wave generation circuit 43
Compared with the Gili wave generation circuit (correction signal generation circuit 16),
FV converter 26, transistor 75, resistor 76,
The difference is that 77 is added. Integration circuit 74
Are transistors 78, 82, resistors 79, 80, 83,
Composed of a capacitor 81 and a diode 80 '
I have. This integrating circuit 74 is basically connected to the resistor 80
This is a circuit that performs integration by the capacitor 81.
The transistors 78 and 82 and the resistor 7
9, 83 are used for impedance conversion. Ma
The correction signal output circuit 17 is the same as the circuit shown in FIG.
The same voltage-current conversion is used. Hereinafter, the horizontal deflection circuit shown in FIG.
In the case where the horizontal deflection circuit shown in FIG.
Description will be made in comparison with the case. Second embodiment shown in FIG.
The correction coil to correct the horizontal linearity
Current i_GThe waveform is approximately a sawtooth wave
Was used. However, the ideal correction current i_G0Waveform is complete
It has a slightly different waveform from that of the normal sawtooth wave. Where
Imaginary correction current i_G0From the equivalent circuit shown in FIG.
And the difference between Equations (3) and (1), [0044] (Equation 7) Becomes This ideal correction current i_G0The waveform is the point in FIG.
The waveform becomes as shown by the line. The above-described ideal correction current i_G0The auxiliary coil
41, the correction signal supply circuit shown in FIG.
61 may be used. Hereinafter, the correction signal supply shown in FIG.
The operation of the supply circuit 61 will be described. In the circuit shown in FIG.
In the sawtooth wave generation circuit 43, the transistor 53,
Constant current I flowing through resistor 55₀, Capacitor 56 (capacity
C₀) And the slope (I₀/ C₀) Is defined by sawtooth wave
Creating pressure. Then, in the subsequent integration circuit 74,
The sawtooth wave voltage generated by the sawtooth wave generation circuit 43 is
Anti-8 (resistance value R₁), Capacitor 81 (capacitance C₁)
Time constant τ '= C₁R₁Is integrated based on However,
High speed is required when the sawtooth wave voltage falls
Capacitor C using diode 80 '₁Faster charging
ing. The correction signal is supplied by the correction signal supply circuit 61.
Correction current i_G'Can be represented by the following equation. [0046] (Equation 8) Therefore, in equations (8) and (9), i_G0= I_G
By selecting each constant so that
A corrected current waveform can be obtained. [0047] (Equation 9)When the horizontal deflection frequency changes, water
To keep the flat deflection current constant, the current voltage E is
It must be changed in proportion to the wave number. Correction shown in FIG.
In the signal supply circuit 61, even in this case, the expression (10) must be satisfied.
The current I₀Value corresponds to horizontal deflection frequency
And then automatically adjust. This corresponds to the FV converter in FIG.
The inverter 26, the transistor 75, and the resistors 76 and 77
The base voltage V of the transistor 53₀To control
By doing. Based on the above operation, the correction shown in FIG.
When the signal supply circuit 61 is used, the horizontal deflection frequency
Regardless of the change, the ideal correction signal waveform is always
For optimum horizontal linearity
It is possible to keep. Further, in the embodiment of FIG. 3 (FIG. 11),
Integrates the positive signal generation circuit 16 with the sawtooth wave generation circuit 43
The circuit 74 can also be used. The fourth embodiment of the present invention (FIG. 13)
Instead of the integration circuit 74 described in the fifth embodiment (FIG. 16)
A similar effect can be obtained by using a multiplying circuit. [0052] The display device of the present invention has a horizontal frequency.
Equipped with a horizontal deflection circuit that can handle different numbers of input signals
At the same time, the horizontal deflection circuit compensates according to the horizontal deflection frequency.
Correction signal supply means for outputting a positive signal and horizontal deflection current
Linearity correction means for changing the nearness correction amount
And the correction amount of the horizontal linearity correction means is
Since it is changed according to the change of the directional frequency,
When the horizontal deflection frequency changes, the resistance of the horizontal deflection circuit
Of linearity of horizontal deflection characteristics caused by minute
Can be corrected. Further, the linearity correction means is provided with a correction signal
The output current of the supply means is input as the base current,
With transistor that controls the amount of correction
When the horizontal deflection frequency is high, the linearity
A correction signal is output to reduce the correction range,
When the directional frequency is low, increase the linearity correction range.
Output the correction signal so that
When the direction frequency changes, the resistance component of the horizontal deflection circuit
Correction of linearity degradation of horizontal deflection characteristics caused by
can do. Therefore, it is possible to cope with a change in the horizontal deflection frequency.
The effect of maintaining good horizontal linearity
is there.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a principle diagram of a circuit showing a first embodiment of the present invention. FIG. 2 is a circuit diagram of a conventional horizontal deflection circuit. FIG. 3 is a circuit diagram showing an equivalent circuit of a horizontal deflection polarization output circuit. FIG. 4 is a waveform diagram of a horizontal deflection current. FIG. 5 is a characteristic diagram showing a relationship between horizontal deflection frequency and horizontal linearity. FIG. 6 is a circuit diagram of a specific circuit according to the first embodiment of the present invention. FIG. 7 is a circuit diagram of a specific circuit according to the first embodiment of the present invention. FIG. 8 is a circuit diagram of a specific circuit according to the first embodiment of the present invention. FIG. 9 is a circuit diagram of a specific circuit according to the first embodiment of the present invention. FIG. 10 is a characteristic diagram showing a DC superposition characteristic of a linearity coil. FIG. 11 is a principle diagram of a circuit showing a second embodiment of the present invention. 12 is a circuit diagram of a specific circuit of the correction signal supply circuit 61 in FIG. FIG. 13 is a waveform chart showing signal waveforms at various parts of the circuit shown in FIG. 12; FIG. 14 is a principle diagram of a circuit showing a third embodiment of the present invention. 15 is a circuit diagram of a specific circuit of the correction signal supply circuit 61 in FIG. FIG. 16 is a principle diagram of a circuit showing a fourth embodiment of the present invention. 17 is a circuit diagram of a specific circuit of the correction signal supply circuit 61 in FIG. FIG. 18 is a waveform chart showing a correction current waveform. [Description of Signs] 8 Linearity 16 Correction signal generation circuit 17 Correction signal output circuit 21 Control winding 26 FV converter 41 Auxiliary coil 43 Sawtooth wave generation circuit 61 Correction signal supply circuit 74 Integration circuit

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hitoshi Maekawa 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Hitachi, Ltd. Consumer Electronics Laboratory (72) Inventor Koji Kito 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa (56) References JP-A-57-166778 (JP, A) JP-A-58-157260 (JP, A) JP-A-61-206371 (JP, A) Jpn. JP, U) JP-B-59-48593 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04N 3/23 G09G 1/00 G09G 1/04 G09G 1/16 H04N 3 / 27

Claims (1)

(57) [Claims] In a display device including a horizontal deflection circuit capable of generating a horizontal deflection current corresponding to an input signal having a different horizontal deflection frequency, the horizontal deflection circuit includes a horizontal output transistor, and a damper diode connected in parallel to the horizontal output transistor. A resonance capacitor connected in parallel to the damper diode, a series circuit connected in parallel to the resonance capacitor, and a series connection of a horizontal deflection coil and coil means for correcting horizontal linearity; and an inductance characteristic of the coil means. And a control means for variably controlling the coil circuit, wherein the inductance characteristic of the coil means flows through the series circuit through the damper diode than when a horizontal deflection current flows through the series circuit through the horizontal output transistor. When the inductance value becomes larger, Shows the line resistance, the control means, when the horizontal deflection frequency changes, the inductance value of said coil means when the horizontal deflection current flowing in said series circuit through the damper diodes,
A display device, wherein a control is performed so as to change the inductance value more than an inductance value when a horizontal deflection current flows through the series circuit through the horizontal output transistor. 2. When the horizontal deflection frequency changes in a higher direction, the control means determines an inductance value of the coil means when a horizontal deflection current flows through the series circuit through the damper diode, and a horizontal deflection current is transmitted through the horizontal output transistor. 2. The display device according to claim 1, wherein the control is performed such that the inductance value is reduced to be greater than an inductance value when the current flows through the series circuit.