KR970001889Y1 - An equipment for controlling wide-screen - Google Patents

Abstract

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Description

Wide screen processing unit

1 is a circuit diagram showing an aspect ratio converter for conventional wide screen processing.

2 is a diagram showing the operation of each part according to the mode selection of FIG.

3 is a circuit diagram showing a wide screen processing apparatus of the present invention.

4 is a detail of the integrator of FIG.

(A)-(e) of FIG. 5 is an operation waveform diagram of each part of FIG. 3 and FIG.

6A to 6C are waveform diagrams explaining the operation principle of the wide screen processing apparatus of the present invention.

7 is a view showing a screen display state by the wide screen processing apparatus of the present invention.

* Explanation of symbols for main parts of the drawings

100: color signal processing unit 110: cathode ray tube

111: cathode 114: wide correction coil

120: deflection control unit 130: integrator

140: polarity inverter 150: switching unit

CS: control signal

The present invention is a wide screen television receiver having a wide screen having a 16: 9 aspect ratio, and is used for speed modulation when displaying an image signal having a 4: 3 aspect ratio on a wide screen in wide mode. The center of the screen is displayed in the normal state, and the outer portion of the screen is displayed in the horizontal direction stretched to display a wide screen processing apparatus to achieve a linearity in the center of the screen where a large portion of the image is displayed .

Conventionally, when displaying an image signal with a 4: 3 aspect ratio on a wide screen in wide mode, the entire screen is displayed to be uniformly stretched in the horizontal direction. There was a problem that the display is stretched in the direction and crushed.

This conventional technique will be described in detail with reference to the drawings of FIGS. 1 and 2.

FIG. 1 is a circuit diagram showing an aspect ratio converting apparatus for a conventional wide screen processing. As shown therein, a low pass for filtering out an input luminance signal Y and a color difference signal RY (VY) respectively to remove noise An output signal of the filter 1-3, an analog / digital converter 4-6 for converting the output signal of the low pass filter 1-3 into a digital signal, and an analog / digital converter 4-6 Line memory 7-9 for storing and outputting the data in line units, a digital analog converter 10-12 for converting the output signal of the line memory 7-9 into an analog signal, and the digital / analog converter ( A low pass filter 13-15 for low noise filtering the output signal of 10-12), and PIP / POP (Picture In Picturd / Picture Out Picture) to the output signal of the low pass filter 13-15; An output switching unit 16 that mixes and outputs a signal, a vertical synchronization signal VP, and a number The line outputs the sampling signals SA1 and SA2 to the analog / digital converters 4-6 and the digital / analog converters 10-12 according to the synchronization signal HP and the mode selection signal SEL. The timing generator 17 outputs the write and read clock signals WCLK RCLK to the memory 7-9.

In the conventional aspect ratio converting apparatus configured as described above, the timing generator 17 is shown in FIG. 2 by the input of the vertical synchronizing signal VP and the horizontal synchronizing signal HP and the mode selection signal SEL according to the user's mode selection. As shown in the diagram, sampling signals SA1 and SA2 are generated and applied to the analog / digital converters 4-6 and the digital / analog converters 10-12, and the write and read clock signals WCLK (RCLK) are applied. Is generated and applied to the line memory 7-9.

Then, the luminance signal (Y) and the color difference signal (RY) (BY) that are input are respectively removed from the high pass noise through the low pass filter (1-3), and then the analog / digital converter (4-6) in accordance with the sampling signal (SA1). ) Is converted into a digital signal and stored in the line memory 7-9 according to the write clock signal WCLK.

The digital signal stored in the line memory 7-9 is read and output according to the read clock signal RCLK, and is converted into an analog signal according to the sampling signal SA2 in the digital / analog converter 10-12, and has a low pass. The high frequency noise is removed and output through the filter 13-15.

As such, the luminance and color difference signals output from the low pass filter 13-15 are signals whose aspect ratio is converted according to the output signal of the timing generator 17, and the signals are mixed with the PIP / POP signals by the output switching unit 16. And output.

In the conventional aspect ratio converter, when the mode selection is set to the normal mode, the sampling signal SA2 and the read clock signal RCLK are compared to the sampling signal SA1 and the write clock signal WCLK as shown in the diagram shown in FIG. ) Is 4/3 times faster, so the input video signal with 4: 3 aspect ratio, that is, the luminance signal (Y) and the color difference signal (RY) (BY), is displayed on a wide screen in a size of 4: 3. do.

However, when the mode selection is set to the wide mode, since the sampling signals SA1 and SA2, the write clock signal WCLK and the read clock signal RCLK are all the same at 18 MHz, the video signal having the aspect ratio of 4: 3 remains unchanged. There was a problem in that the image was displayed in an elliptical shape that was stretched horizontally due to the wide screen deflection in which the ratio of horizontal to vertical was 16: 9. In the zoom mode to solve the problem in the wide mode, the sampling signal (SA1, SA2), the write clock signal (WCLK) and the read clock signal (RCLK) are all the same as 18MHZ, but the magnification of the vertical deflection is displayed to enlarge the normal screen without expanding in the horizontal direction. There was a problem that the cut is not visible.

The present invention was devised to solve the above-mentioned conventional problems. A correction coil is installed in the cathode ray tube, and the parabolic current is supplied to the correction coil according to the flyback pulse signal. By increasing the horizontal portion in the horizontal direction, the important parts are displayed in a large amount, and the screen with a wide-to-vertical aspect ratio of 16: 9 can be seen while maintaining the linearity of the center portion of the screen where the user's eyes are mainly focused. It is an object of the present invention to provide a wide screen processing apparatus, which will be described in detail with reference to the accompanying drawings of FIGS. 3 to 7.

FIG. 3 is a circuit diagram showing a wide screen processing apparatus of the present invention. As shown therein, the color signal is processed by the processor 101, amplified by the amplifier 102, and applied to the cathode 111 of the cathode ray tube 11. The color signal processing unit 100 and the synchronous separator 121 separate the vertical and horizontal synchronous signals from the luminance signal, respectively, through the vertical and horizontal drive units 122 and 123 and the vertical and horizontal output units 124 and 125. A deflection control unit 120 applied to the vertical and horizontal deflection coils 112 and 113 to control vertical and horizontal deflection; a wide correction coil 114 installed at the cathode ray tube 110 to correct horizontal deflection; An integrator 130 for generating a parabolic wave by integrating a flyback pulse signal output from a flyback transformer (not shown) of the deflection controller 120 and a polarity of an output signal of the integrator 130. The polarity inverter 140 for inverting the voltage and the control signal CS The switching unit 150 is configured to switch the output signal of the polarity inverter 140 and apply it to the wide correction coil 114.

FIG. 4 is a detailed view showing the integrator 130 of FIG. 3, whereby the flyback pulse signal is connected to the capacitor C1 through the coil L and the connection point thereof is connected to the resistor R. As shown in FIG. The flyback pulse signal was integrated in the third order by connecting to the condenser C2.

In the wide screen processing apparatus according to the present invention, the red, green, and blue color signals that are input are processed by the color signal processor 101 of the color signal processor 100, amplified by the amplifier 102, and then, of the cathode ray tube 110. Is applied to the cathode 111.

In addition, the synchronous separator 121 of the deflection control unit 120 separates the vertical and horizontal synchronous signals from the input luminance signal, and the separated vertical and horizontal synchronous signals are vertical and horizontal with the vertical and horizontal drive units 122 and 123. It is applied to the vertical and horizontal deflection coils 112 and 113 installed in the cathode ray tube 110 through the output units 124 and 125 to adjust the vertical and horizontal deflection of the electron beam.

In this state, the flyback pulse signal generated as shown in (a) of FIG. 5 in the flyback transformer of the deflection control unit 120 is first integrated as shown in (b) of FIG. Secondary integration as shown in (c) of FIG. 3, third-order integration as shown in (d) of FIG. 5 is output to parabolic waves, and the output parabolic waves are converted to the As shown in E), the polarity is reversed and output.

Here, the present invention configures the wide mode so that the user can select a 16: 9 wide mode and a 4: 3 wide mode. When the 16: 9 wide mode is selected, the switching unit 150 does not operate. Since the output signal of is not applied to the wide correction coil 114, the image having a 4: 3 ratio of horizontal to vertical is stretched and displayed in the horizontal direction on the wide screen of the cathode ray tube 110 as before.

When the user selects the 4: 3 wide mode, the switching unit 150 is operated by the control signal CS so that the output signal of the inverter 140 is transmitted to the wide correction coil 114 through the switching unit 150. Since the parabolic wave current flows through the wide correction coil 114 as illustrated in FIG. 5B, the wide correction coil 114 performs a wide correction operation.

Here, the principle that the wide correction coil 114 performs the wide correction operation will be described in detail.

In general, in the 4: 3 wide mode, the horizontal deflection coil 113 flows a horizontal deflection current as shown in (a) of FIG. 6. When the parabolic wave current flowing together overlaps the horizontal deflection current, the combined horizontal deflection current becomes as shown in Fig. 6C.

Therefore, as shown in FIG. 7, the composite horizontal deflection current is displayed in a normal state without distortion in the center of the wide screen, and the horizontal portion is displayed in the horizontal direction as the speed of the beam becomes faster than normal.

As described in detail above, in the present invention, when the wide mode is selected, the center portion of the wide screen in which a large portion of the image is displayed is displayed as normal, and the outer portion is gradually displayed in the horizontal direction so that the user can display the screen horizontally. The effect is that you can see the entire screen without feeling any increase.

Claims (2)

Color signal processing unit 100 for processing and amplifying the color signal to apply to the cathode 111 of the cathode ray tube 110, and the deflection control unit 120 to control the vertical and horizontal deflection by separating the vertical and horizontal synchronous signal from the attenuation signal, respectively And a wide correction coil 114 installed at the cathode ray tube 110 to correct horizontal deflection and a flyback pulse signal output from the flyback transformer of the deflection control unit 120 to generate a parabolic wave. Integrator 130, the polarity inverter 140 to invert the polarity of the output signal of the integrator 130, and the output signal of the polarity inverter 140 in accordance with the control signal CS by switching the wide correction Wide screen processing apparatus, characterized in that consisting of a switching unit 150 applied to the coil (114). The wide screen processing apparatus of claim 1, wherein the integrator is a third order integrator.