KR19980075337A - TV's horizontal deflection screen variable control device - Google Patents

Abstract

The present invention provides a variable control device for a horizontal deflection screen of a television for reproducing a sense of reality on a video screen by varying the horizontal output current value of a horizontal output stage for driving a horizontal deflection coil in a television.

Accordingly, the present invention detects the phase difference between the oscillation frequency signal and the horizontal synchronizing signal oscillated by the separated horizontal synchronizing signal, and the synchronization separating unit 10 for separating the horizontal synchronizing signal from the composite video signal of television broadcasting. Driving the horizontal deflection coil 17 and the FBT 18 while being driven by the AFC circuit 12 for performing the operation, the horizontal drive unit 14 for amplifying the deflection output waveform by the oscillation operation, and the amplified horizontal output drive signal. In a horizontal deflection device of a television comprising a horizontal output unit 16 having a drive transistor 20 for driving a horizontal deflection variable mode for horizontal scanning of the left and right screen areas 34A and 34B of a video screen. Control means 26 for generating a horizontal deflection variable control pulse having a predetermined pulse period in accordance with the setting of the function setting means 24, the horizontal deflection variable mode set by the function setting means 24, and the horizontal deflection value. By applying a control pulse, the horizontal output current value generated by the conduction of the drive transistor 20 of the horizontal output unit 16 is variably adjusted to adjust the horizontal scan position of the left / right screen regions 34A and 34B of the video screen. It is characterized in that it comprises a horizontal variable adjustment means 28 to vary, and by intermittently varying the horizontal scanning position for the left / right screen area of the video screen to reproduce a more dynamic and three-dimensional presence of the video screen have.

Description

TV's horizontal deflection screen variable control device

The present invention relates to a horizontal deflection screen variable control device of a television, and more particularly, to a horizontal deflection screen variable control device of a television for reproducing a dynamic realism of a video screen by varying a driving state for a horizontal deflection output in a television. It is about.

Nowadays, in the TV which is generally used, the video signal and the audio are processed after receiving the TV broadcasting signal according to the predetermined broadcasting channel through the tuner among the multiple broadcasting channels transmitted from the multiple television stations, and then performing the video / audio processing. The CRT (Cathode Ray Tube) and the speaker are used to reproduce the image and sound. In the case of such CRT, the luminance signal and the color signal are synthesized in the video signal processing process for the video signal of the television broadcast. The / B signals are formed by the R / G / B electron gun, respectively, and are irradiated through the shadow mask (or aperture grille) of the CRT to the R / G / B fluorescent surface to form a predetermined video screen, and the CRT For correct scanning in the vertical and horizontal directions of the scanning beam by the video signal of the television broadcast scanned in the CRT of / Is the horizontal deflection means are provided.

According to such vertical / horizontal deflection means, a vertical / horizontal deflection drive signal is obtained through an oscillation operation and a frequency control operation by a synchronization signal separated from a composite video signal of a predetermined broadcast channel tuned by a tuner. In the case of the horizontal deflection means, the scanning ratio scanned by the CRT CRT can be adjusted left and right with respect to the screen in response to the deflection drive of the vertical deflection means, and the horizontal deflection period is 60 Hz due to the vertical synchronization signal. In the case of 15.75KHz, there is a difference of about 260 times, so it is not only necessary to control the frequency phase of each scanning beam constituting the video screen, but also 25kV supplied to the heater of CRT brown tube and various high voltage circuits. High pressure generation of is possible.

On the other hand, the horizontal deflecting means controls the oscillation frequency by detecting the oscillation circuit oscillating by the horizontal synchronizing signal separated from the composite video signal of the television broadcast, and the phase difference between the oscillation frequency obtained by the horizontal synchronizing signal and the oscillating operation. AFC (Automatic Frequency Control) circuit, a horizontal drive circuit driven to amplify the output waveform obtained from the oscillation circuit to the signal size required for horizontal deflection drive, and a horizontal deflection drive signal amplified from the horizontal drive circuit A horizontal output circuit is provided so that a high voltage is induced in a flyback transformer (FBT) while supplying a horizontal output current to the horizontal deflection coil so that it can be supplied to the anode of the CRT.

However, in the case of the horizontal deflection means employed to adjust the horizontal deflection of the scanning beam scanned in the CRT of the television CRT, the horizontal deflection of the scanning beam is always stable while driving the horizontal deflection coil by a horizontal output driving operation such as automatic frequency control. It is possible to reduce the shaking on the video screen, but when the program contents of the television broadcast reproduced on the video screen are needed to be more realistic and realistic, the screen dynamic is utilized by using the horizontal deflection means. There is a need to reproduce a sense of reality.

Accordingly, the present invention has been made in view of the above-described circumstances, and a horizontal deflection screen variable control apparatus for a television for reproducing the realism of a video screen by varying the horizontal output current value of a horizontal output stage for driving a horizontal deflection coil in a television. The purpose is to provide.

According to the present invention, the horizontal deflection screen variable control apparatus according to the present invention comprises: a synchronization separator for separating a horizontal synchronization signal from a composite video signal of a television broadcast, and oscillated by the separated horizontal synchronization signal; An AFC circuit that detects the phase difference between the oscillation frequency signal and the horizontal synchronization signal to perform frequency control, a horizontal driver that amplifies the deflection output waveform by the oscillation operation, and is connected by the amplified horizontal output drive signal to provide a horizontal deflection coil and FBT. A horizontal deflection apparatus for a television comprising a horizontal output section having a drive transistor for driving, comprising: function setting means for key setting a horizontal deflection variable mode for horizontal scanning of a left / right screen region of a video screen; According to the setting of the horizontal deflection variable mode by the means, a horizontal deflection variable control pulse having a predetermined pulse period is Variable horizontal output current generated by conduction of the drive transistor of the horizontal output unit by receiving the control means and the horizontal deflection variable control pulse to change the horizontal scan position of the left / right screen area of the video screen. Provided is a horizontal deflection screen variable control apparatus for a television having horizontal variable adjustment means.

According to the present invention configured as described above, when the horizontal deflection variable mode for the horizontal scan for the left / right screen area of the video screen in which the video signal of the television broadcast is reproduced on the television is set, the horizontal deflection coil in the horizontal deflection means By intermittently controlling the horizontal output current of the horizontal output circuit which is responsible for driving the camera, the deflection position of the scanning beam scanned in the left / right screen area of the video screen is intermittently changed, thereby reproducing a three-dimensional sense of reality on the video screen. I'm trying to.

1 is a circuit diagram showing a horizontal deflection screen variable control device of a television according to the present invention;

2 is a waveform diagram illustrating a circuit operation for horizontal deflection driving according to a preferred embodiment of the present invention;

3 is a schematic diagram illustrating a state in which a horizontal deflection value of a video screen is changed according to a preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: synchronous separator, 12: AFC circuit,

14: horizontal driving unit, 16: horizontal output unit,

17: horizontal deflection coil, 18: FBT,

20, 30, 32: transistor, 22: damper circuit section,

24: function setting section, 26: control section,

28: Evaluation variable adjustment department.

Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

1 is a circuit diagram showing a horizontal deflection screen variable control apparatus of a television according to the present invention. In the apparatus of the present invention, reference numeral 10 separates a horizontal synchronous signal from a composite video signal of a television broadcast reproduced on a video screen. The sync separation unit is shown.

Also, reference numeral 12 denotes an AFC circuit for detecting a phase difference between the separated horizontal synchronization signal and the oscillation frequency signal generated as a result of oscillation from the horizontal synchronization signal, and controlling the oscillation frequency, wherein the AFC circuit 12 is a reference. A phase detection circuit for receiving a horizontal synchronization signal and an oscillation frequency signal to detect a phase difference between the signals and an integrating circuit for integrating the detected voltage into a DC component, and 14 automatically controls the frequency. A horizontal drive unit for amplifying the oscillated frequency signal to a signal size capable of deflection driving.

Also, reference numeral 16 receives a horizontal deflection drive signal amplified through the horizontal drive unit 14 to generate a horizontal output current for the deflection drive of the horizontal deflection coil 17 and the high voltage generation operation of the FBT 18. As a horizontal output unit, the horizontal output unit 16 is driven on / off by receiving a horizontal deflection drive signal (see the base voltage (a) in FIG. 2) from the horizontal drive unit 14 at its base end. The driving transistor 20 which generates a horizontal output current having a sawtooth waveform (see collector current b of FIG. 2) through the stage, and is connected in parallel between the collector stage and the ground terminal with respect to the driving transistor 20, respectively, And a damper circuit section 22 composed of a diode D1 and a capacitor C1 which acts as a damper for the output current.

Here, the horizontal deflection coil 17 is generated by a sawtooth wave-type horizontal output current from the horizontal output unit 16, the horizontal output corresponding to the turn-on period of the horizontal deflection drive signal The current forming the horizontal scanning period in the period t1 to t2 of the current (see coil current C in Fig. 2) is generated as a gradual rising current, while in the horizontal retrace period due to the horizontal synchronization signal in the period t2 to t5. Correspondingly, it is generated as a sudden falling current.

Further, reference numeral 24 is a matrix button unit provided in a predetermined portion of the remote control unit for remote control or the main body of the main body, so that horizontal scanning is changed for the left / right screen regions 34A and 34B (see FIG. 3) of the video screen. The function setting section for key setting the deflection variable mode is shown.

Further, reference numeral 26 denotes a control unit that performs execution control on the overall function operation assigned to the television according to the key operation of the function setting unit 24, and the control unit 26 controls the key operation of the function setting unit 24. When the horizontal deflection variable mode is set, the horizontal deflection variable control pulse having, for example, a predetermined pulse period corresponding to the pulse period of the horizontal synchronization signal is generated.

Also, reference numeral 28 is a horizontal variable adjustment unit for variably adjusting the current value of the horizontal output current of the horizontal output unit 16 by receiving a horizontal deflection variable control pulse having a predetermined pulse period from the control unit 26, The horizontal variable adjusting unit 28 has its collector end connected between the collector end of the drive transistor 20 constituting the horizontal output unit 16 and the horizontal deflection coil via the resistor R1 and the base end thereof. The first transistor 30, which is made of, for example, an NPN transistor, whose conduction state is turned on / off in response to the pulse period when the horizontal deflection variable control pulse is applied to the driving transistor 20 and the horizontal deflection coil ( 17) and the base end thereof is connected between the resistor R1 and the collector end of the first transistor 30 so that the conduction state is turned on in response to the on / off operation of the first transistor 30. For example on / off A second transistor 32 composed of a PNP transistor, and one end thereof is connected between the collector ends of the first and second transistors 30 and 32 and the horizontal output unit 16, and thus the first and second transistors ( And a drop capacitor C2 and a drop inductor L1 for charging or discharging the horizontal output current from the horizontal output unit 16 according to the on / off operation of 30 and 32.

Here, the horizontal deflection coil 17 is a period of t2 to t5 in the coil current of the horizontal deflection coil 17 (see Fig. 2 (c)) in accordance with the horizontal deflection variable operation of the horizontal variable adjustment unit 28. By intermittently varying the waveform width for the horizontal retrace period, the screen widths for the left / right screen regions 34A and 34B of the video screen are intermittently variable adjusted as shown in FIG.

Next, the operation of the present invention made as described above will be described in detail with reference to the accompanying drawings.

First, when a television broadcast signal according to a predetermined broadcast channel is tuned and image / audio processed, and then video / audio is reproduced through a CRT and a speaker, respectively, the synchronization separator 10 combines the reproduced television broadcast. The horizontal synchronization signal is separated from the video signal, and the AFC circuit 12 detects the phase difference by comparing the oscillation frequency signal generated as a result of the oscillation operation by the separated horizontal synchronization signal with the horizontal synchronization signal. While the frequency of the oscillation frequency signal is automatically controlled, the horizontal driving unit 14 amplifies the oscillation frequency signal through the AFC circuit 12 to a signal level capable of horizontal deflection.

Accordingly, the drive transistor 20 of the horizontal output unit 16 receives the horizontal deflection drive signal (see the base voltage (a) of FIG. 2) from the horizontal drive unit 14 at its base end and the on / off period thereof. In response to this, the conduction state is turned on / off, and in the horizontal deflection coil 17, the sawtooth wave type horizontal output current generated by the conduction operation of the drive transistor 20 through the damper circuit unit 22 (the collector current of FIG. 2). (b) is applied to form a coil current as shown in FIG. 2 (c), thereby adjusting the horizontal deflection state of the scanning beam scanned into the CRT screen of the CRT screen.

In this state, when the horizontal deflection variable mode for changing the horizontal deflection state with respect to the scanning beam of the CRT screen is set by the key operation of the function setting unit 24, the control section 26 is synchronized with the horizontal synchronous signal. As the horizontal deflection variable control pulse is generated in a predetermined pulse period unit, and the first transistor 30 of the horizontal variable adjustment unit 28 receives the horizontal deflection variable control pulse and its conduction state is turned on / off, The second transistor 32 is turned on / off in response to the on / off state of the first transistor 30.

Accordingly, the horizontal output current generated by the driving operation of the driving transistor 20 of the horizontal output unit 16 is supplied to the drop capacitor C2 and the drop inductor L1 to repeat the charging / discharging operation intermittently. As a result, t2 to t5 periods (ie, horizontal retrace periods) (see (c) of FIG. 2) of the coil current appearing in the horizontal deflection coil 17 are intermittently adjusted and left / right screen areas of the CRT screen are displayed. The horizontal scanning positions for 34A and 34B are intermittently variable.

According to the present invention made as described above, by varying the horizontal deflection current so that the horizontal scanning position for the left / right screen area of the video screen to reproduce the image of the television broadcast on the television intermittently, the video screen In response to the characteristics of the broadcast program to be reproduced has the advantage that it is possible to produce a more dynamic and dynamic screen.

Claims (2)

A synchronization separator 10 for separating the horizontal synchronization signal from the composite video signal of television broadcasting, and an AFC circuit for detecting the phase difference between the oscillation frequency signal and the horizontal synchronization signal oscillated by the separated horizontal synchronization signal to perform frequency control ( 12), a horizontal driving unit 14 for amplifying the deflection output waveform by the oscillation operation, and a driving transistor 20 for driving the horizontal deflection coil 17 and the FBT 18 while being conducted by the amplified horizontal output driving signal. In the horizontal deflection apparatus of a television consisting of a horizontal output unit 16 with Function setting means (24) for keying a horizontal deflection variable mode for horizontal scanning of the left and right screen areas (34A, 34B) of the video screen; Control means 26 for generating a horizontal deflection variable control pulse having a predetermined pulse period in accordance with the setting of the horizontal deflection variable mode by the function setting means 24; When the horizontal deflection variable control pulse is applied, the horizontal output current value generated by the conduction of the driving transistor 20 of the horizontal output unit 16 is adjusted to adjust the left / right screen regions 34A and 34B of the video screen. A horizontal deflection screen variable control device for a television, comprising a horizontal variable adjusting means for varying the horizontal scanning position. The horizontal variable adjusting means (28) of claim 1, wherein the horizontal variable adjusting means (28) of the first transistor (30) and the first transistor (30) conducting conduction by receiving a horizontal deflection variable control pulse from the control means (26). The horizontal output current applied from the horizontal output unit 16 is dropped according to the conduction state of the second transistor 32 and the first and second transistors 30 and 32 which are conducted in correspondence with the conduction state. And a capacitor (C2) and an inductor (L1).