KR100201997B1 - Apparatus for controlling horizontal raster of crt - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal raster adjusting apparatus of a television CRT apparatus, wherein the first and second horizontal raster adjusting buttons for inputting a horizontal raster adjusting signal for causing a screen displayed on the CRT apparatus to adjust raster in a horizontal direction. A remote controller 40 having 46a and 46b, a controller 42 for generating a PWM signal corresponding to the horizontal raster adjustment signal from the remote controller 40, and controlling the horizontal raster; A digital-analog converting section 44 which analog-converts a PWM signal (horizontal raster adjusting signal) of the rotor, and interposed between the horizontal output section 16 and the horizontal position adjusting section 18. A horizontal raster adjusting unit 46 is further provided to change the time constant of the horizontal output signal according to the analog raster horizontal adjusting signal at 44, for the image portion concealed on the left or right side of the CRT apparatus. table It will enable the.

Description

Horizontal Raster Control of Television CRT System

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal raster adjusting device of a television CRT device. More particularly, the horizontal deflection signal is varied by a time constant change of an automatic frequency control (AFC) signal so that an image displayed on the CRT device is displayed in a horizontal direction. A horizontal raster adjusting device of a television CRT device for displaying a hidden image portion by moving the center.

For a CRT device of a television which reproduces a video signal of a broadcast program transmitted from a broadcasting station, the R / G / B color ratio emitted from the R / G / B electron gun based on the color components of the video signal is displayed on the fluorescent panel of the CRT device. Vertical / horizontal deflection systems are provided to deflect the R / G / B color beams in the vertical and horizontal directions so that they are evenly distributed and reached.

Among them, the vertical deflection system is separated from the video signal so that the R / G / B color beams emitted from the R / G / B electron gun can reach the fluorescent panel of the CRT apparatus without pincushion (ie, distortion) in the vertical direction. The oscillation of the vertical drive signal corresponding to the vertical synchronization signal causes the vertical deflection current to flow through the vertical deflection coil by the oscillated vertical drive signal.

In addition, the horizontal deflection system oscillates the horizontal drive signal corresponding to the horizontal synchronous signal separated from the video signal, and causes the horizontal deflection current to flow in the horizontal deflection coil by the oscillated horizontal drive signal to radiate from the R / G / B electron gun. The R / G / B color beams act to reach the fluorescent panel of the CRT apparatus without the pincushion in the horizontal direction.

1 is a block diagram showing a horizontal circuit of a general television. According to the horizontal circuit, when the horizontal AFC unit 10 receives the horizontal synchronization signal separated from the video signal, the horizontal oscillation output (15.75 KHz) and the horizontal synchronization signal are obtained. Is compared to apply the AFC voltage detected according to the phase difference of the comparison result to the horizontal oscillator 12, and the horizontal oscillator 12 is the horizontal oscillation signal of the same phase as the horizontal synchronizing signal based on the AFC voltage (color The horizontal synchronous signal at the time of broadcast reception generates 15734.264 Hz) and is applied to the horizontal excitation amplifier 14, and the pulse voltage amplified by the horizontal excitation amplifier 14 is applied to the horizontal output unit 16. . The horizontal output switching element (ie, the horizontal output transistor) of the horizontal output unit 16 switches according to the amplified pulse voltage so that the horizontal deflection current flows through the horizontal deflection coil 22.

In addition, a part of the horizontal output signal of the horizontal output unit 16 is applied to the convergence circuit (not shown) and is applied to the positive voltage of the CRT apparatus through the high voltage controller 24 and the high voltage rectifier 26.

In addition, the horizontal position adjusting unit indicated by 18 in FIG. 1 acts to adjust the center of the raster to move the position of the raster appropriately in the horizontal direction by adjusting the DC current flowing in the horizontal deflection coil 22, and FIG. The horizontal pincushion correction unit, which is denoted as, serves to correct the pincushion in which the image displayed on the CRT device is immersed inward in the horizontal direction.

FIG. 2 is a circuit diagram showing an example of the configuration of the horizontal positioning unit 18. In general, the sawtooth wave current flowing through the horizontal deflection coil 22 tends to reduce the linearity of the raster while the left side of the raster increases. Therefore, since the raster shows a state in which the raster is always slightly moved to the left, the adjustment of the horizontal position is preferable when a proper DC current is applied to the horizontal deflection coil 22 in the direction of 'A'. That is, when the current flows in the horizontal output transistor 16 ′ of the horizontal output unit 16 through the horizontal deflection coil 22 in FIG. 2, the raster is moved to the right while viewing the screen.

In addition, in Fig. 2, 18a represents a variable resistor of approximately 30Ω for adjusting the horizontal position, and 18b represents a choke coil for applying only a DC current to the deflection coil while preventing a deflection output loss.

However, a video signal transmitted from a broadcasting station usually has a concealed portion 30 'approximately 10% of that of the screen display area 30 of the CRT apparatus. 1 and 2 adjusts the variable resistor 18a of the horizontal position adjusting unit 18 provided in the horizontal circuit of the television shown in FIG. 2 so that an appropriate DC current flows to the horizontal deflection coil 22 so as to be displayed on the CRT apparatus. However, such horizontal raster adjustment may not be easily performed by the viewer.

In other words, when an important scene is displayed in a concealed state at the left or right end of a CRT apparatus in which a video signal of a broadcast program is displayed, the horizontal raster must be adjusted to display the concealed image part. When the television is produced, the viewer often watches only the horizontal position adjusted by the variable resistor 18a for the horizontal position adjustment of FIG. 2, and therefore, the image of the concealed portion is almost invalidated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and the display of a hidden image portion not displayed on the CRT apparatus by changing the time constant of the AFC signal according to the horizontal raster adjustment signal from the remote controller so that the horizontal raster is performed. It is an object of the present invention to provide a horizontal raster adjusting device for a television CRT apparatus to enable the.

In order to achieve the above object, according to a preferred example of the present invention, in a television having a horizontal position adjusting unit for horizontally adjusting the horizontal output signal from the horizontal output unit so that the center of the screen displayed on the CRT apparatus is moved in the horizontal direction. And a remote control having first and second horizontal raster adjustment buttons for inputting a horizontal raster adjustment signal for causing the screen displayed on the CRT apparatus to be raster adjusted in a horizontal direction, and a horizontal raster adjustment signal from the remote control. A control unit for controlling the horizontal raster by generating a corresponding PWM signal, a digital-analog conversion unit for analog-converting the PWM signal (horizontal raster adjustment signal) of the control unit rotor, the horizontal output unit and the horizontal position adjusting unit The number according to the horizontal raster adjustment signal interposed between and digitally converted by the digital-analog converter. And a horizontal raster adjusting unit for changing the time constant of the output signal, wherein the horizontal raster adjusting unit has a time constant resistor having one end connected to the horizontal output signal, a rear end of the resistance, and an input side of the horizontal position adjusting unit. Provided is a horizontal raster adjusting device for a television CRT device, which is composed of a capacitance-variable diode that is connected between and whose capacitance is changed by an analog horizontal raster adjusting signal from the digital-analog converter.

According to the horizontal raster adjusting apparatus of the television CRT apparatus according to the present invention, the control unit generates a PWM signal in accordance with an operation amount of the first or second horizontal raster adjusting button provided in the remote control unit. The horizontal raster adjustment signal, which has been analog-converted by the digital-analog converter, is applied to the capacitance-variable diode of the horizontal raster adjustment unit to determine the time constant of the horizontal output signal applied to the horizontal position adjustment unit. The horizontal scanning timing is controlled by the variable control, whereby the center of the screen displayed on the CRT apparatus is moved in the horizontal direction, thereby enabling the display of the hidden image portion.

1 is a block diagram showing a horizontal circuit of a typical television;

2 is a circuit diagram showing an example of the configuration of the horizontal position adjustment unit shown in FIG.

3 is a schematic diagram illustrating a video display state of a general television broadcast signal and a CRT apparatus;

4 is a block diagram showing a horizontal raster adjusting device of a television CRT apparatus according to the present invention;

5A is a waveform diagram illustrating the operation of the horizontal raster adjusting device of the television CRT apparatus according to the present invention;

5B and 5C are exemplary views for explaining the horizontal raster adjusting operation on the CRT apparatus executed by the horizontal raster adjusting apparatus of the television CRT apparatus according to the present invention.

* Description of the symbols for the main parts of the drawings *

10: horizontal AFC unit, 12: horizontal oscillation unit,

14: horizontal excitation amplifier, 16: horizontal output,

18: horizontal positioning unit, 40: remote control,

40a, 40b: first and second horizontal raster adjustment buttons,

42: control unit, 44: digital-to-analog conversion unit,

46: horizontal raster adjusting section, 46b: variable capacitance diode.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 4 is a block diagram showing a horizontal raster adjusting device of a television CRT apparatus according to the present invention. In Fig. 16, Fig. 16 shows a horizontal output unit (see Fig. 1) for horizontal scanning of a video signal displayed on the CRT apparatus. And 18 denotes a horizontal position adjusting section having a variable resistor (18a in FIG. 2) for controlling current and applying a horizontal output signal from the horizontal output section 16 to the horizontal deflection coil.

In Fig. 4, reference numeral 40 denotes a remote controller for selecting the overall function of the television, and the remote controller 40 includes first and second horizontal raster adjustments for adjusting the horizontal raster of the video signal displayed on the CRT apparatus. Bars 40a and 40b are provided, wherein the first horizontal raster adjustment button 40a is provided to display the concealed left image portion on the CRT device, and the second horizontal raster adjustment button 40b is provided. The concealment is provided for the right image portion to be displayed on the CRT apparatus.

42 denotes a control unit that performs a control function of the television in response to the function selection signal from the remote control unit 40, and the control unit 42 is the first or second horizontal raster adjustment button (1) of the remote control unit (40). In response to the horizontal raster adjustment signal input from 40a or 40b), a pulse width modulation (PWM) signal for horizontal raster adjustment is output.

44 denotes a digital-to-analog converter (D / A converter) for analog-converting the PWM signal for horizontal raster adjustment applied from the controller 42, and 46 denotes the horizontal raster adjustment signal converted from the analog signal. A horizontal raster adjusting unit for adjusting the time constant of the horizontal output signal applied from the horizontal output unit 16 to the horizontal position adjusting unit 18 so that the screen displayed on the CRT apparatus is moved horizontally to the left or the right. The horizontal raster adjusting section 46 is parallel to the time constant resistor 46a connected to the output side of the horizontal output section 16, the rear end of the resistor 46a, and the input side of the horizontal positioning section 16. And a capacitance-variable diode 46b connected to one end thereof to which the horizontal raster adjustment signal from the D / A converter 44 is applied.

Subsequently, the operation of the horizontal raster adjusting device of the television CRT apparatus according to the present invention having the above-described configuration will be described in detail with reference to the waveform diagram and the horizontal raster adjusting screen example shown in FIGS. 5A to 5C. Explain.

Preferably, according to the present invention, the capacitance-variable diode 46b provided in the horizontal raster adjuster 46 has a blackout proportional to the voltage level V applied to one end thereof, as shown in FIG. In view of this, the capacity C is variable, and according to the present invention, the time constant of the horizontal raster adjusting section 46 is the position 'HC' of FIG. 5 (a) (ie, the horizontal center position on the CRT apparatus). The horizontal raster adjustment amount adjustable by the first horizontal raster adjustment button 40a provided in the remote controller 40 is the position 'HL' (ie, the maximum left raster level of FIG. 5A). The horizontal raster adjustment amount adjustable by the second horizontal raster adjustment button 40b is set to the position 'HR' (ie, the maximum right raster level) of FIG. It becomes preferable.

In this state, when a selection signal of a specific function is input from the remote controller 40, the control unit 42 performs control of a function corresponding to the function selection signal, so that the video signal of a specific channel on the corresponding television CRT apparatus. Will be displayed.

In the case of display of such a video signal, the horizontal output signal for the horizontal scan motor is applied from the horizontal output section 16 to the horizontal position adjusting section 18 as described with reference to FIG. ) Is such that the DC current is applied to the horizontal deflection coil at the level adjusted by the variable resistor 18a (e.g., position 'HC' in FIG. 5 (a)) as described with reference to FIG. The image displayed on the screen is in a state where the horizontal center of the screen is held (for example, FIG. 3).

In this state, when the horizontal raster adjustment signal is input from, for example, the first horizontal raster adjustment button 40a provided in the remote controller 40, a PWM signal corresponding to the horizontal raster adjustment signal is generated to generate the D / A. The D / A converter 44 converts the horizontal raster adjustment signal (PWM signal) into analog by converting the horizontal raster adjustment signal (PWM signal). 46) to be applied to one end.

Accordingly, the capacitance-variable diode 46 has its capacitance gradually changed to the position 'HL' side of FIG. 5 (a) according to the operation amount of the first horizontal raster adjustment button 40a, and thus the horizontal The time constant of the stur adjusting section 46 is shortened so that the period of the horizontal output signal applied from the horizontal output section 16 to the horizontal position adjusting section 18 changes in response to the time constant. When the horizontal output signal of the changed time constant is applied to the horizontal position adjusting unit 18, the period of the horizontal deflection current flowing through the horizontal deflection coil corresponding to the time constant is also shortened, so that the horizontal scan is performed in advance as a whole. In the apparatus, as shown in FIG. 5B, the hidden image portion on the left side can be displayed.

On the other hand, when the horizontal raster adjustment signal is input from the second horizontal raster adjustment button 40b of the remote controller 40, the control section 42 generates a PWM signal corresponding to the horizontal raster adjustment signal to generate the D signal. Is applied to the / A conversion section 44, and the D / A conversion section 44 converts the PWM signal (horizontal raster adjustment signal) into analog and converts the capacitance-variable diode of the horizontal raster adjustment section 46 ( To one end of 46b). Accordingly, the capacitance of the variable capacitance diode 46a is varied to the position 'HR' side of FIG. 5 (a) according to the adjustment amount of the second horizontal raster adjustment button 40b of the remote controller 40. Accordingly, the time constant of the horizontal raster adjustment unit 46 is gradually increased.

According to the increased time constant, the horizontal scanning timing due to the horizontal output signal applied from the horizontal output section 46 to the horizontal position adjusting section 18 is set later, so that on the CRT apparatus, FIG. The hidden image portion on the right side is displayed in the form shown in FIG.

Accordingly, the horizontal raster of the image displayed on the CRT apparatus is changed to the left or the right by the adjustment of the first and second horizontal raster adjustment buttons 40a and 40b provided in the remote controller 40, thereby hiding. The part of the image which is displayed can be displayed to the viewer.

On the other hand, the present invention is not limited to the above examples and various changes and modifications can be made within the scope not departing from the gist of the invention.

As described above, according to the horizontal raster adjusting apparatus of the television CRT apparatus according to the present invention, the horizontal output signal is changed in time constant according to the horizontal raster adjusting signal from the remote control to adjust the horizontal scanning timing for the CRT apparatus. The horizontal center of the screen displayed on the device is shifted to the left or right to allow selective display of the hidden video portion not displayed on the CRT device. Viewing becomes possible.

Claims (3)

In a television equipped with a horizontal position adjusting unit 18 for horizontally adjusting a horizontal output signal from the horizontal output unit 16 so that the center of the screen displayed on the CRT apparatus is moved in the horizontal direction. A remote controller 40 for inputting a horizontal raster adjustment signal for causing the screen displayed on the CRT apparatus to be raster adjusted in a horizontal direction; A controller 42 for generating a PWM signal corresponding to the horizontal raster adjustment signal from the remote controller 40 to control the horizontal raster; A digital-to-analog converter 44 for analog-converting the PWM signal (horizontal raster adjustment signal) of the controller 42; Interposed between the horizontal output unit 16 and the horizontal position adjusting unit 18 to change the time constant of the horizontal output signal according to the horizontal raster adjustment signal analog-converted by the digital-analog converter 44. A horizontal raster adjusting device for a television CRT apparatus, characterized by further comprising a horizontal raster adjusting unit (46). The first remote raster adjustment button 46a for causing the horizontal raster of the CRT apparatus to be performed to the left, and the horizontal raster of the CRT apparatus to the right. A horizontal raster adjusting device for a television CRT apparatus, comprising: two horizontal raster adjusting buttons (46b). 2. The horizontal raster adjusting section (46) according to claim 1, wherein the horizontal raster adjusting section (46) includes a time constant resistor (46a) having one end connected to the horizontal output signal, a rear end of the resistor (46a), and an input side of the horizontal position adjusting section (18). The horizontal raster adjusting device of the television CRT apparatus, which is constituted by a capacitance-variable diode 46b connected therebetween and whose capacitance is changed by an analog horizontal raster adjusting signal from the digital-analog converting section 44. .

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