JP3284610B2 - Color cathode ray tube receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube receiver having a moire canceling device which can reduce moire generated in a color cathode ray tube using a shadow mask or an aperture grill.

[0002]

2. Description of the Related Art In a color cathode ray tube using a shadow mask or an aperture grille, when a spatial frequency component of a video signal or a scanning line supplied thereto is very close to a repetition period of a detailed structure of the shadow mask or the aperture grille. ,
Due to the interference between the two, a specific stripe pattern (moire) may be generated on the screen of the color cathode ray tube.

As a conventional moire canceling method, there are a method of phase-modulating a horizontal synchronizing signal, a method of adding a reset in a vertical cycle according to the number of horizontal scanning lines, and the like.

The former moiré canceling device will be described below with reference to FIG. An external composite synchronization signal (C
S) is supplied to the sync separation circuit 1 and the horizontal sync signal (H
S) and the vertical synchronization signal (VS) are separated. A vertical synchronization signal (VS) from the outside or a vertical synchronization signal (VS) from the synchronization separation circuit 1 is directly supplied to the horizontal / vertical oscillation circuit 2.

A horizontal synchronizing signal (HS) from the outside or a horizontal synchronizing signal (HS) from the synchronizing separation circuit 1 is supplied to a horizontal scanning line detecting circuit 6 constituting the moiré canceling circuit 5. The horizontal synchronizing signal (HS) from the outside or the horizontal synchronizing signal (H
S) and an external vertical synchronizing signal (VS) or a vertical synchronizing signal (VS) from the sync separation circuit 1.

Then, the phase-modulated horizontal synchronizing signal (HS) from the horizontal synchronizing signal phase modulation circuit 7 of the moiré cancel circuit 5 is supplied to the horizontal / vertical oscillation circuit 2. Then, the phase-modulated horizontal oscillation output from the horizontal / vertical oscillation circuit 2 is supplied to the horizontal deflection output circuit 3, and the vertical oscillation output that is not phase-modulated is supplied to the vertical deflection main circuit 4.

Thus, since the horizontal deflection signal supplied to the deflection yoke of the color cathode ray tube is phase-modulated, the spatial frequency in the horizontal direction such as a moire on the screen of the color cathode ray tube, particularly a trinitron (registered trademark), is increased. Moire generated on the screen of a color cathode ray tube having components can be eliminated. The same applies to the method of adding the reset in the vertical cycle according to the number of horizontal scanning lines described above.

[0008]

However, the above-described conventional moiré canceling method directly modulates the horizontal synchronizing signal supplied to the horizontal / vertical oscillation circuit. Loss of synchronization occurs because no horizontal synchronization signal is supplied to the circuit. Further, when the above-described moiré canceling method is applied to a color cathode ray tube using a shadow mask having a spatial frequency component also in the vertical direction, it is not possible to reduce moire caused by the spatial frequency component in the vertical direction.

In view of the above, according to the present invention, even if the modulation circuit fails, no out-of-synchronization occurs, and moire caused by both the horizontal and vertical spatial wavenumber components of the color cathode ray tube can be reduced. Another object of the present invention is to propose a color cathode ray tube receiver having a simple circuit configuration.

[0010]

According to a first aspect of the present invention, there is provided a horizontal / vertical oscillation circuit, and a horizontal deflection output circuit and a vertical deflection output to which a horizontal oscillation signal and a vertical oscillation signal from the horizontal / vertical oscillation circuit are respectively supplied. Circuit, a horizontal deflection frequency control circuit connected to the horizontal / vertical oscillation circuit, and a vertical deflection current feedback circuit (or vertical centering circuit) connected to the vertical deflection output circuit. A set / reset signal generating circuit for alternately generating a set signal and a reset signal every vertical cycle in synchronization with a vertical synchronizing signal, and a set signal and a reset signal from the set / reset signal generating circuit are supplied; The level changes every line in synchronization with the supplied horizontal synchronizing signal, and is set each time a set signal arrives. Be provided with alternating signal generating circuit for generating an alternating signal which is reset every arrival of Tsu bets signals,
The vertical synchronization signal supplied to the set / reset signal generation circuit is supplied to the horizontal / vertical oscillation circuit, and the horizontal synchronization signal supplied to the alternating signal generation circuit is supplied to the horizontal / vertical oscillation circuit. Is supplied to a horizontal deflection frequency control circuit and a vertical deflection current feedback circuit (or a vertical centering circuit), and the horizontal and vertical deflection signals are alternately changed for each line to a predetermined positive and negative minute phase amount. This is a color cathode ray tube receiver having a moiré canceling device that performs phase modulation.

A second invention is directed to a horizontal / vertical oscillation circuit, a horizontal deflection output circuit and a vertical deflection output circuit to which horizontal and vertical oscillation signals from the horizontal / vertical oscillation circuit are respectively supplied, and a horizontal / vertical oscillation circuit. In a color cathode ray tube receiver having a horizontal deflection frequency control circuit connected to an oscillation circuit, a vertical deflection current feedback circuit and a vertical centering circuit connected to a vertical deflection output circuit, in synchronization with a supplied vertical synchronization signal. A set / reset signal generating circuit for alternately generating a set signal and a reset signal for each vertical cycle; a set signal and a reset signal from the set / reset signal generating circuit being supplied and synchronized with the supplied horizontal synchronizing signal Then, the level changes every line, and is set each time a set signal arrives, and is set every time a reset signal arrives. An alternation signal generation circuit for generating an alternation signal to be set is supplied to the horizontal / vertical oscillation circuit for supplying the vertical synchronization signal supplied to the set / reset signal generation circuit and to the alternation signal generation circuit A horizontal synchronization signal is supplied to a horizontal / vertical oscillation circuit, and an alternating signal from an alternating signal generation circuit is supplied to a horizontal deflection frequency control circuit.
A moire canceling device for supplying a vertical deflection current feedback circuit and a vertical centering circuit to phase-modulate the horizontal and vertical deflection signals alternately for each line with a predetermined positive and negative minute phase amount; It is a color cathode ray tube receiver.

[0012]

According to the first aspect of the present invention, the set / reset signal generating circuit alternately generates the set signal and the reset signal every vertical cycle in synchronization with the vertical synchronizing signal supplied thereto. Is supplied with a set signal and a reset signal from a set / reset signal generating circuit, and the level changes every line in synchronization with the supplied horizontal synchronizing signal, and is set every time the set signal arrives. In addition, it generates an alternating signal that is reset every time a reset signal arrives, supplies a vertical synchronization signal supplied to a set / reset signal generation circuit to a horizontal / vertical oscillation circuit, and supplies the same to an alternating signal generation circuit. A horizontal synchronization signal is supplied to a horizontal / vertical oscillation circuit, and an alternating signal from an alternating signal generation circuit is supplied to a horizontal deflection frequency control circuit and a vertical deflection current feedback circuit (or It is supplied to the vertical centering circuit) and, phase modulating drives out positive and negative predetermined small phase amount alternately every line the horizontal and vertical deflection signals.

[0013]

[0014]

[0015]

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIG. FIG. 2 shows the details of the moiré canceling circuit shown in FIG. 1, and FIG. 3 shows a timing chart of signals 1 to 3 of each section in FIG. An external composite synchronization signal (C
S) is supplied to the sync separation circuit 1 and the horizontal sync signal (H
S) and the vertical synchronization signal (VS) are separated. A vertical synchronization signal (VS) from the outside or a vertical synchronization signal (VS) from the synchronization separation circuit 1 is directly supplied to the horizontal / vertical oscillation circuit 2. The horizontal / vertical synchronization signal (HS) from the outside or the horizontal synchronization signal (HS) from the synchronization separation circuit 1 and the vertical synchronization signal (VS) from the outside or the vertical synchronization signal (VS) from the synchronization separation circuit 1 are horizontal / vertical. It is supplied directly to the oscillation circuit 2.
The horizontal oscillation signal and the vertical oscillation signal from the horizontal / vertical oscillation circuit 2 are supplied directly to the horizontal deflection output circuit 3 and the vertical deflection output circuit 4, respectively.

An external vertical synchronizing signal (VS) is applied to a set / reset circuit 9 constituting the moiré cancel circuit 8.
Alternatively, an external horizontal synchronizing signal (HS) is supplied to an alternating voltage generating circuit 10 to which the vertical synchronizing signal (VS) from the synchronizing separation circuit 1 is supplied and the output of the set / reset circuit 9 is supplied.
Alternatively, a horizontal synchronization signal (HS) from the synchronization separation circuit 1 is supplied.

The alternating voltage from the alternating voltage generating circuit 10 is supplied to a horizontal deflection frequency control circuit (AFC circuit) 11 and / or
The horizontal centering circuit 12 and / or the vertical centering circuit 13 and / or the vertical deflection current feedback circuit 14 are provided. Horizontal deflection frequency control circuit (A
The output of the FC circuit 11 is supplied to the horizontal / vertical oscillation circuit 2. The output of the horizontal Centers ring circuit 12 is supplied to a horizontal deflection output circuit 3. The output of the vertical centering circuit 13 is supplied to the vertical deflection output circuit 4. The vertical deflection current feedback circuit 14 exchanges signals with the vertical deflection output circuit 4.

Referring to FIG. 2, moiré cancel circuit 8
Will be described with reference to the timing chart of FIG. The vertical synchronizing signal (VS) is a resistor (1 kΩ) 2
3, the clock input terminal CK of the first JK flip-flop circuit 24 constituting the set / reset circuit 9
Supplied to Further, a horizontal synchronizing signal (HS) is supplied to a clock input terminal CK of a second JK flip-flop circuit 17 constituting the alternating voltage generating circuit 10 through a resistor (1 kΩ) 16.

First, the configuration of the set / reset circuit 9 will be described. The set input terminal S and the reset input terminal R of the JK flip-flop circuit 24 are grounded. The non-inverting output terminal Q of the flip-flop circuit 24 is a K input terminal K
, And the inverted output terminal Q (bar) is directly connected to the J input terminal J. The non-inverting output terminal Q of the flip-flop circuit 24 is connected to one end of a resistor (10 kΩ) 26 and the cathode of a small-signal diode 27 through a capacitor (1000 pF) 25, and the other end of the resistor 26 and the anode of the diode 27 are connected. Grounded. The inverted output terminal Q (bar) of the flip-flop circuit 24 is connected to one end of a resistor 29 and the cathode of a small signal diode 30 through a capacitor (1000 pF) 28, and the other end of the resistor 29 and the anode of the diode 30 are grounded. Is done. The capacitor 25 and the resistor 26 and the capacitor 28 and the resistor 29 each constitute a differentiating circuit.

Thus, the vertical synchronizing signal (VS) is applied to the cathode of the diode 27 and the cathode of the diode 30.
, A set pulse and a reset pulse are generated alternately and supplied to the set input terminal S and the reset input terminal R of the second JK flip-flop circuit 17, respectively.

Next, the alternating voltage generating circuit 10 will be described. The non-inverted output terminal Q of the JK flip-flop circuit 17 is directly connected to the K input terminal K, and the inverted output terminal Q (bar) is directly connected to the J input terminal J. The non-inverting output terminal Q of the flip-flop circuit 17 is grounded through a DC blocking capacitor (4.7 μF) 18 and potentiometers (10 kΩ) 19 and 20 connected in parallel. The outputs of the movable terminals of the potentiometers 19 and 20 are passed through amplifiers 21 and 22, respectively, to the horizontal deflection frequency control circuit (AFC circuit) 11 and
(Or) a horizontal centering circuit 12 and (or) vertical <br/> Centers ring circuit 13, and (or) is supplied to the vertical deflection current feedback circuit 14.

Thus, the JK flip-flop circuit 17
A non-inverted output terminal Q of the above, a rectangular wave signal having a frequency twice as high as the horizontal frequency, which is set every set pulse and reset every time a reset pulse arrives, is obtained. These are used as modulation signals as horizontal deflection frequency control circuits (AFC circuits) 11 and 11, respectively.
(Or) horizontal centering circuit 12 ｛circuit 11 and (or
Is supplied to the) 12} and (or) perpendicular Centers ring circuit 13 and vertical deflection current feedback circuit 14 (circuit 13 or 14). As a result, A of the horizontal deflection frequency control circuit (AFC circuit) 11 is
The FC voltage and / or the horizontal centering voltage are phase-modulated alternately by a predetermined positive and negative minute phase amount, and the display position of the color video signal supplied to the color cathode ray tube is 1
By slightly shifting left and right for each line (the amount can be varied by adjusting the potentiometer 19), moire due to horizontal spatial frequency components is reduced, and the modulation signal allows the vertical centering voltage and / or (or 2.) The vertical deflection current is alternately phase-modulated with a predetermined positive and negative minute phase amount, and the display position of the color video signal supplied to the color cathode ray tube is slightly shifted up and down line by line. The amount can be varied by adjusting the potentiometer 20), thereby reducing moire due to vertical spatial frequency components.

[0024]

According to the first aspect of the invention, the horizontal / vertical oscillation circuit, the horizontal deflection output circuit and the vertical deflection output circuit to which the horizontal oscillation signal and the vertical oscillation signal from the horizontal / vertical oscillation circuit are respectively supplied are provided. A color cathode ray tube receiver having a horizontal deflection frequency control circuit connected to a horizontal / vertical oscillation circuit and a vertical deflection current feedback circuit (or a vertical centering circuit) connected to a vertical deflection output circuit. A set / reset signal generation circuit for alternately generating a set signal and a reset signal for each vertical cycle in synchronization with a synchronization signal; and a set signal and a reset signal from the set / reset signal generation circuit are supplied and supplied. The level changes line by line in synchronization with the horizontal synchronizing signal, and is set each time a set signal arrives, and the reset signal is set. Of it provided the alternating signal generating circuit for generating an alternating signal which is reset every incoming set /
The vertical synchronization signal supplied to the reset signal generation circuit is supplied to the horizontal / vertical oscillation circuit, and the horizontal synchronization signal supplied to the alternating signal generation circuit is supplied to the horizontal / vertical oscillation circuit. The signals are supplied to a horizontal deflection frequency control circuit and a vertical deflection current feedback circuit (or a vertical centering circuit) so that the horizontal and vertical deflection signals alternately have a predetermined positive and negative minute phase amount for each line. A moiré canceling device that performs phase modulation by using the same, even if the modulation circuit breaks down, synchronization does not occur, and moire caused by both the horizontal and vertical spatial wavenumber components of the color cathode ray tube is reduced. And a color cathode ray tube receiver having a simple circuit configuration can be obtained.

According to the second aspect of the present invention, a horizontal / vertical oscillation circuit, a horizontal deflection output circuit and a vertical deflection output circuit to which a horizontal oscillation signal and a vertical oscillation signal from the horizontal / vertical oscillation circuit are respectively supplied, In a color cathode ray tube receiver having a horizontal deflection frequency control circuit connected to a horizontal / vertical oscillation circuit, a vertical deflection current feedback circuit and a vertical centering circuit connected to a vertical deflection output circuit,
A set / reset signal generating circuit for alternately generating a set signal and a reset signal every vertical cycle in synchronization with the supplied vertical synchronizing signal, and a set signal and a reset signal from the set / reset signal generating circuit are supplied. In addition, an alternating signal generating circuit for changing the level for each line in synchronization with the supplied horizontal synchronizing signal, generating an alternating signal which is set each time a set signal arrives and is reset each time a reset signal arrives And a vertical / synchronous signal supplied to the set / reset signal generation circuit.
In addition to supplying to the vertical oscillation circuit, the horizontal synchronization signal supplied to the alternating signal generation circuit is supplied to the horizontal / vertical oscillation circuit,
An alternation signal from the alternation signal generation circuit is supplied to a horizontal deflection frequency control circuit, a vertical deflection current feedback circuit and a vertical centering circuit, and the horizontal and vertical deflection signals are alternately positive and negative predetermined minutely for each line. Since there is a moiré canceling device that modulates the phase with a phase amount, even if the modulation circuit fails, no synchronization loss occurs, and both are caused by both the horizontal and vertical spatial wavenumber components of the color cathode ray tube. A moiré can be reduced, and a color cathode ray tube receiver having a simple circuit configuration can be obtained.

[0026]

[0027]

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a specific configuration of a moiré cancel circuit according to the embodiment;

FIG. 3 is a timing chart for explaining the operation of the embodiment;

FIG. 4 is a block diagram showing a conventional moiré canceling device.

[Explanation of symbols]

 Reference Signs List 1 synchronization separation circuit 2 horizontal / vertical oscillation circuit 3 horizontal deflection output circuit 4 vertical deflection output circuit 8 moire cancel circuit 9 set / reset circuit 10 alternating voltage generation circuit 11 horizontal deflection frequency control circuit (AFC circuit) 12 horizontal centering circuit 13 vertical Centering circuit 14 Vertical deflection current feedback circuit

Claims (2)

(57) [Claims] 1. A horizontal / vertical oscillation circuit, a horizontal deflection output circuit and a vertical deflection output circuit to which a horizontal oscillation signal and a vertical oscillation signal from the horizontal / vertical oscillation circuit are respectively supplied,
A horizontal deflection frequency control circuit connected to the horizontal / vertical oscillation circuit; and a vertical deflection current feedback circuit (or vertical centering circuit) connected to the vertical deflection output circuit.
And a set / reset signal generating circuit for alternately generating a set signal and a reset signal for each vertical cycle in synchronization with the supplied vertical synchronizing signal, and the set / reset signal generating circuit. And the reset signal is supplied, and the level changes every line in synchronization with the supplied horizontal synchronizing signal. The level is set every time the set signal arrives, and every time the reset signal arrives. An alternating signal generating circuit for generating an alternating signal to be reset; supplying a vertical synchronizing signal supplied to the set / reset signal generating circuit to the horizontal / vertical oscillating circuit; The supplied horizontal synchronizing signal is supplied to the horizontal / vertical oscillation circuit, and the alternating signal from the alternating signal generating circuit is supplied to the horizontal deflection frequency. The vertical and horizontal deflection signals are supplied to a control circuit and the vertical deflection current feedback circuit (or the vertical centering circuit) so that the horizontal and vertical deflection signals are alternately phase-modulated for each line with a predetermined positive and negative minute phase amount. A color cathode ray tube receiver comprising the moiré cancel device described above. 2. A horizontal / vertical oscillation circuit, a horizontal deflection output circuit and a vertical deflection output circuit to which horizontal and vertical oscillation signals from the horizontal / vertical oscillation circuit are supplied, respectively.
In a color cathode ray tube receiver having a horizontal deflection frequency control circuit connected to the horizontal / vertical oscillation circuit, a vertical deflection current feedback circuit and a vertical centering circuit connected to the vertical deflection output circuit, the vertical synchronization supplied A set / reset signal generating circuit for alternately generating a set signal and a reset signal every vertical cycle in synchronization with the signal; and a set signal and a reset signal from the set / reset signal generating circuit are supplied and supplied. An alternating signal generation circuit for changing the level for each line in synchronization with the horizontal synchronizing signal and setting an alternating signal which is set each time the set signal arrives and which is reset each time the reset signal arrives The vertical synchronization signal supplied to the set / reset signal generation circuit is supplied to the horizontal / vertical oscillation circuit. In addition, a horizontal synchronization signal supplied to the alternating signal generating circuit is supplied to the horizontal / vertical oscillation circuit, and an alternating signal from the alternating signal generating circuit is supplied to the horizontal deflection frequency control circuit and the vertical deflection current feedback. A moiré canceling device which supplies the horizontal and vertical deflection signals to the circuit and the vertical centering circuit so as to alternately modulate the horizontal and vertical deflection signals line by line with predetermined positive and negative minute phase amounts. Color cathode ray tube receiver.