KR100218913B1 - Display apparatus of multimode video signal of video display system - Google Patents

Abstract

The disclosed display device is capable of optimally displaying various types of video signals having different frequencies of horizontal sync signals and vertical sync signals input from a video card of a computer system on a cathode ray tube.

The present invention converts an image signal input from a computer system into a digital image signal according to the frequency of the horizontal synchronizing signal and the vertical synchronizing signal in the analog / digital converting unit, and the converted digital image signal is a resolution suitable for the cathode ray tube in the image converting unit. After converting into a digital video signal of an analog video signal, the analog video signal is amplified by the video signal amplifier and output to the cathode ray tube, and according to the frequency of the horizontal sync signal and the vertical sync signal input from the computer system. The deflection / high pressure control unit generates a deflection control signal and a high pressure control signal, generates a deflection signal in the deflection unit according to the generated deflection control signal, and generates a high pressure in the high pressure generator according to the generated high pressure control signal and supplies it to the cathode ray tube. Various operations input from the computer system And a video signal of a de can be suitably displayed on the resolution of the cathode ray tube, and to simplify the configuration of the circuit, and improve the productivity, the production cost is reduced.

Description

Multi-mode Video Signal Display Device of Video Display Equipment

The present invention relates to a video display device such as a multi-mode monitor connected to a computer system such as a personal computer and used as a screen display device, wherein the horizontal synchronization signal is output from the video card of the computer system for display on the screen of the video display device. And a multi-mode video signal display apparatus of a video display device displaying various kinds of video signals having different frequencies of vertical synchronization signals on a cathode ray tube.

In general, an image display device allows a user to easily monitor and confirm an operation state of a computer system, and the computer system outputs a predetermined image signal according to an operation currently performed through a built-in video card. The video display device inputs and outputs a predetermined video signal on the screen.

In order for a video display device to display a predetermined video signal output from a video card of a computer system, a vertical sync signal and a horizontal sync signal that the computer system outputs along with a predetermined video signal to be displayed on the video display device must be used. do.

The frequency of the horizontal synchronizing signal and the vertical synchronizing signal output from the computer system to the image display device varies depending on the operation mode.

For example, CGA (Color Graphic Adapter) mode has a horizontal sync signal frequency of 15.75KHz, vertical sync signal has a frequency of 60Hz, and VGA (Video Graphic Array) mode has a horizontal sync signal frequency of 31.47KHz, and is vertical. The frequency of the synchronization signal is 60 Hz, the frequency of the horizontal synchronization signal is 48.36 KHz, the frequency of the vertical synchronization signal is 60 Hz, and the frequency of the horizontal synchronization signal and the vertical synchronization signal is different according to each operation mode.

In addition to the operation modes described above, there are various modes, and the frequency of the horizontal synchronizing signal and the vertical synchronizing signal differs according to these operation modes.

Therefore, when the operation mode of the signal output from the video card of the computer system is changed, the video display device determines the operation mode corresponding to the frequency of the horizontal synchronization signal and the vertical synchronization signal, and performs the operation according to the determined operation mode. .

1 is a circuit diagram illustrating a conventional display device.

Here, reference numeral 1 denotes a computer system such as a personal computer.

Reference numeral 2 denotes an image signal amplifying unit which amplifies a predetermined image signal input from the computer system 1, that is, color signals of R, G, and B, and outputs them to the cathode ray tube 7.

Reference numeral 3 denotes an operation mode determination unit that determines an operation mode by the frequencies of the vertical synchronization signal and the horizontal synchronization signal input from the computer system 1.

Reference numeral 4 is a circuit time constant control unit for outputting a time constant of the circuit according to the operation mode determined by the operation mode determination unit 3.

Reference numeral 5 denotes a deflection portion for controlling the vertical deflection and the horizontal deflection of the cathode ray tube 7 according to the output signal of the circuit time constant controller 4, and reference numeral 6 denotes an output signal of the circuit time constant controller 4 According to the high-pressure generating unit for generating a high pressure applied to the cathode ray tube (7).

In the conventional display device having such a configuration, the video signal amplifier 2 amplifies a predetermined video signal input from the computer system 1 and applies it to the cathode ray tube 7.

The operation mode determination unit 3 determines the operation mode by the frequency of the vertical synchronization signal and the horizontal synchronization signal input from the computer system 1, and outputs a control signal corresponding to the determined operation mode.

The high pressure generator 6 generates a high pressure according to the control signal output from the operation mode determination unit 3, and supplies the generated high pressure to the cathode ray tube 6.

In addition, the deflection unit 5 generates a deflection signal in accordance with a control signal output from the operation mode determination unit 3, and the generated deflection signal is in accordance with the output signal of the image signal amplifying unit 2. The electron beam generated by the electron gun is deflected vertically and horizontally so that a predetermined image is displayed on the cathode ray tube 7.

That is, the above-described prior arts have vertical size, vertical position, horizontal size, horizontal position, side-pin cution distortion, barrel distortion, tilt, trapezoidal distortion according to each operation mode. And various values of time constants related to horizontal linearity, vertical linearity, and S-shape correction, are previously stored in the circuit time constant controller 4, and corresponding circuit time constants of the operation mode according to the frequency of the vertical synchronizing signal and the horizontal synchronizing signal Will print the value of.

Therefore, every time the operation mode of the video signal output from the computer system 1 is changed, the time constant of the circuit is changed to generate a high voltage, and the operation of the system becomes unstable due to the transient state. Under stress, it is very difficult to accurately determine the degree of stress, and the life of the product has been shortened.

And because there are various types of transient modes, it is difficult to analyze the transient state of each part, which makes it much higher than the normal operating range so that each part can withstand the transient stress sufficiently when designing the circuit. Designed as a component having an operating range has a problem that the production cost of the product rises.

In addition, when the product is manufactured, it is necessary to perform adjustments to determine the control value representing the optimal screen state for each operation mode, which is very complicated and takes a lot of time, resulting in a decrease in productivity.

And it operates in the operation mode below the maximum capacity of the cathode ray tube, the operating range is wider and the number of operation modes increases, the number of components and the printed circuit board size increases, and the analog output from the computer system There is a problem that it is very difficult to integrate using the video signal as it is.

Accordingly, an object of the present invention is to provide a multimode mode of a video display device that can optimally display various types of video signals having different frequencies of horizontal sync signals and vertical sync signals input from a video card of a computer system on a cathode ray tube. An image signal display device is provided.

1 is a circuit diagram showing a conventional display device;

2 is a circuit diagram showing an overall configuration of a display device of the present invention;

3 is a detailed circuit diagram illustrating a video signal conversion / control signal generator of FIG. 2;

4 is a detailed circuit diagram illustrating the image converter of FIG. 3;

5A to 5C are waveform diagrams for explaining the operation of the deflection control signal generator.

6A and 6B are waveform diagrams for explaining the operation of the high voltage control signal generator.

Explanation of symbols on the main parts of the drawings

10: computer system 20: video signal conversion / control signal generator

30: video signal amplifier 40: deflection unit

50: high pressure generating unit 60: cathode ray tube

210: clock generator 220: deflection / high voltage control signal generator

230: analog / digital converter 240: video converter

241: input buffer 242: horizontal expansion logic section

243: vertical expansion logic section 244: output buffer

250: digital to analog converter

The multi-mode video signal display device of the video display device of the present invention for achieving this purpose is to convert the video signal input from the computer system into a digital video signal according to the frequency of the horizontal synchronization signal and the vertical synchronization signal in the analog / digital conversion unit do.

The converted digital image signal is converted into a digital image signal having a resolution suitable for the cathode ray tube by the image conversion unit, and then converted into an analog image signal, and then amplified by the image signal amplification unit and output to the cathode ray tube.

The deflection / high pressure control unit generates a deflection control signal and a high pressure control signal according to the frequencies of the horizontal synchronization signal and the vertical synchronization signal input from the computer system.

The deflection signal is generated in the deflection unit according to the generated deflection control signal, and the high pressure is generated in the high pressure generator according to the generated high pressure control signal, and the deflection signal generated in the deflection unit and the high pressure generated in the high pressure generator are supplied to the cathode ray tube. To display a predetermined image.

Therefore, according to the present invention, it is possible to display video signals of various operation modes input from a computer system suitably for the resolution of a cathode ray tube, simplify the circuit configuration, improve productivity, and reduce production costs.

Hereinafter, a multi-mode video signal display device of a video display device of the present invention will be described in detail with reference to the accompanying drawings of FIGS. 2 to 6.

2 is a circuit diagram showing an overall configuration of a display device of the present invention.

As shown therein, the image signal input from the computer system 10 is converted into a size according to the resolution of the cathode ray tube 60 and outputted, and the deflection control is performed according to the vertical synchronization signal and the horizontal synchronization signal input from the computer system 10. Amplifying the video signal output from the video signal conversion / control signal generator 20 and the video signal conversion / control signal generator 20 for generating a signal and a high-pressure control signal to the cathode ray tube 60 A deflection unit 40 generating a deflection signal according to a deflection control signal output from the image signal amplifying unit 30 and the image signal conversion / control signal generating unit 20 and supplying the deflection signal to the cathode ray tube 60; The high voltage generating unit 50 generates a high pressure according to the high voltage control signal generated by the image signal conversion / control signal generating unit 20 and supplies it to the cathode ray tube 60.

In the display device of the present invention configured as described above, an image signal input from the computer system 10 is converted into an image signal having a resolution suitable for the cathode ray tube 60 by the image signal conversion / control signal generation unit 20, and the computer system. The deflection control signal and the high pressure control signal are generated in accordance with the vertical synchronizing signal and the horizontal synchronizing signal inputted from (10).

The video signal converted by the video signal conversion / control signal generator 20 is amplified to a sufficient level in the video signal amplifier 30 and applied to the cathode ray tube 60, so that the electron gun provided in the cathode ray tube 60 is provided. Generates an electron beam according to the image signal.

In addition, the deflection unit 40 generates a deflection signal according to the deflection control signal output from the image signal conversion / control signal generator 20 to control the deflection of the electron beam generated by the electron gun of the cathode ray tube 60. In addition, according to the high pressure control signal output from the image signal conversion / control signal generator 20, the high pressure generator 40 generates a high pressure and applies it to the cathode ray tube 60 to the cathode ray tube 60 The predetermined image according to the video signal is displayed.

3 is a detailed circuit diagram illustrating the image signal conversion / control signal generator 20 of FIG. 2.

As shown in the drawing, the clock generator 210 generates a clock signal according to the input horizontal synchronization signal, and the deflection control signal generator 221 generates the deflection control signal according to the clock signal generated by the clock generator 210. And a deflection / high voltage control signal generator 220 for generating a high voltage control signal from the high voltage control signal generator 222 and an image signal input from the computer system 10 to a clock signal generated by the clock generator 210. The analog-to-digital converter 230 for converting the digital video signal, and the digital video signal output from the analog-to-digital converter 230 is converted into a digital video signal having a size corresponding to the resolution of the cathode ray tube 60 A converter 240 and a digital / analog converter 250 for converting the digital video signal output from the video converter 240 into an analog video signal. .

4 is a detailed circuit diagram illustrating the image converter 240 of FIG. 3.

As shown therein, the input and output buffers 241 for storing and outputting the digital video signal output from the analog-to-digital converter 230 and the magnitude of the digital video signal stored in the input buffer 241 are the cathode ray tube 60. Horizontal expansion logic unit 242 horizontally expanding in accordance with the resolution of the; and horizontally expand the size of the digital video signal horizontally extended in the horizontal expansion logic unit 242 in accordance with the resolution of the cathode ray tube 60 The vertical expansion logic unit 243 and the output buffer 244 for storing the image signal output from the vertical expansion logic unit 243 and output to the digital-to-analog converter 250.

In the video signal conversion / control signal generator 20 of the present invention configured as described above, the clock generator 210 generates an operation clock signal according to a horizontal synchronization signal input from the computer system 10, thereby generating a deflection / high voltage control signal generator ( 220) and the analog-to-digital converter 230.

The deflection / high pressure control signal generator 220 generates a deflection control signal from the deflection control signal generator 221 according to the operation clock signal, and generates and outputs a high pressure control signal from the high pressure control signal generator 222.

That is, the deflection control signal generator 221 of the deflection / high pressure control signal generator 220 includes a horizontal pulse generator for driving a horizontal output circuit for generating a vertical triangular wave according to the vertical synchronization signal input from the computer system 10; It consists of a vertical triangular wave generation part, a vertical S-shape correcting part, and a high pressure drive pulse generating part for correcting right and left deflection.

If the horizontal interval of the video signal is N and the horizontal retrace interval is R, one horizontal period of the video signal is N + R.

Therefore, the horizontal pulse generator may generate a low potential during the following Equation 1, and generate a high potential during the Equation 2 to output a horizontal pulse signal.

(N + R) / 2 + α

(N + R) / 2-α

At this time, the duty ratio of the horizontal pulse signal may be adjusted by adjusting the value of the constant α.

And the vertical triangular wave generator generates a vertical triangular wave Y (n) as shown in equation (3).

Y (n) = Y (n-1) + K * A / M

Here, Y (n) is a vertical triangle pie to output,

n is 0, 1, 2,, M-1,

K is a constant,

A is the amplitude of the vertical triangle wave,

M is the number of vertical lines.

The amplitude of the vertical triangular wave may be adjusted by adjusting the value of the constant K.

The vertical S-shaped correction unit includes a look-up table to store data according to frequencies of the vertical synchronization signal and the horizontal synchronization signal, and to store data corresponding to the frequencies of the vertical synchronization signal and the horizontal synchronization signal input from the computer system 10. The vertical S-shaped correction signal S (n) is output as shown in Equation 4 by looking in the lookup table.

S (n) = β × data in lookup table

In Equation 4, β is a constant to adjust the S-shape correction amount to the value of β.

Then, the output vertical waveform is output as shown in FIG. 5C by adding the vertical S-wave correction signal S (n) shown in FIG. 5B to the vertical triangular wave Y (n) shown in FIG. 5A.

As described above, the deflection unit 40 controls the deflection in accordance with the signal output from the deflection control signal generator 221.

The high voltage control signal generator 222 generates a triangular wave SAW (X) and a parabolic wave P (x) as shown in Equation 5 as shown in FIG. 6A.

P (x) = A * (x-B) + C

The magnitude of the triangular wave SAW (X) and the parabolic wave P (x) is compared to generate low potential when SAW (X)> P (x) as shown in FIG. 6B, and SAW (X) <P In the case of (x), a high potential is generated to output a pulse signal.

In the parabolic wave P (x), A is a constant for adjusting the strength of the warp, B is a constant for adjusting the keystone, and C is a constant for adjusting the horizontal width.

As described above, the high pressure generator 50 generates a high pressure according to the signal output from the high pressure control signal generator 222, and supplies the high voltage to the cathode ray tube 60.

Meanwhile, the image signal input from the computer system 10 is converted into a digital image signal by the analog / digital converter 230 according to the clock signal generated by the clock generator 210 and input to the image converter 240.

The image converter 240 stores the digital video signal input from the analog-to-digital converter 230 in the input buffer 241 and expands the horizontal image in a size suitable for the resolution of the cathode ray tube horizontally in the horizontal expansion logic unit 242. do.

The digital video signal horizontally extended by the horizontal expansion logic unit 242 extends vertically in the vertical expansion logic unit 243 to a size suitable for the resolution of the cathode ray tube.

For example, assuming that the size of the digital video signal stored in the input buffer 241 is E * F and the size of the digital video signal to be output is O * P, the horizontal expansion logic unit 242 may (O * E). * Perform (E * F) to output a digital video signal of (O * F) size horizontally extended.

The vertical expansion logic unit 243 performs (O * F) * (F * P) to output a digital image signal of (O * P) size vertically extended.

The extended digital video signal is stored in the output buffer 244, is converted into an analog signal by the digital-to-analog converter 250, and then output to the cathode ray tube 60 through the video signal amplifier 30. .

As described above, the present invention expands and displays the size of the video signal input from the computer system to a size suitable for the resolution of the cathode ray tube, so that the operation of the system is very stabilized, the service life is extended, and parts having a rated standard may be used. Production cost is reduced.

In addition, the single adjustment mode makes it easy to make adjustments to determine the optimal value for the best screen conditions, improving product productivity, displaying video signals according to the maximum capabilities of the cathode ray tube, and wide operating range. Even when the number of operating modes is increased, the number of components and the size of the printed circuit board required have a certain effect.

Claims (8)

Image signal conversion / control signal that outputs video signal inputted from computer system by converting its size according to the resolution of cathode ray tube and generates deflection control signal and high voltage control signal according to vertical synchronization signal and horizontal synchronization signal input from computer system Generator; An image signal amplifier for amplifying the image signal output from the image signal conversion / control signal generator and applying the same to the cathode ray tube; A deflection unit configured to generate a deflection signal according to a deflection control signal output from the image signal conversion / control signal generation unit and supply the deflection signal to the cathode ray tube; And And a high pressure generator for generating a high pressure in accordance with the high voltage control signal generated by the video signal conversion / control signal generator and supplying the cathode ray tube to the cathode ray tube. 2. The apparatus of claim 1, wherein the video signal conversion / control signal generator; A clock generator for generating a clock signal in accordance with a horizontal synchronization signal input from the computer system; A deflection control signal generator for generating a deflection control signal according to the clock signal generated by the clock generator; A high voltage control signal generator for generating a high voltage control signal according to a clock signal generated by the clock generator; An analog / digital converter for converting a video signal input from the computer system into a digital video signal according to a clock signal generated by the clock generator; An image converter for converting the digital image signal output from the analog / digital converter into a digital image signal having a size corresponding to the resolution of the cathode ray tube; And And a digital / analog converter for converting the digital video signal output from the video converter into an analog video signal. The method of claim 2, A deflection control signal generator; A horizontal pulse generator for driving the horizontal output circuit; A vertical triangular wave generator for generating a vertical triangular wave in accordance with a vertical synchronization signal input from a computer system; Vertical S-shaped correction unit; And A multi-mode video signal display device of a video display device, characterized by comprising a high-pressure driving pulse generator for correcting the left and right warpage. The apparatus of claim 3, wherein the horizontal pulse generator comprises: a horizontal pulse generator; And a low potential during the period of Equation 1 and a high potential during the period of Equation 2 to output a horizontal pulse signal. (N + R) / 2 + α (N + R) / 2-α Where N is the horizontal interval of the video signal, R is the horizontal retrace interval α is a constant for adjusting the duty ratio of the horizontal pulse signal. According to claim 3, Vertical triangular wave generating unit; A multi-mode video signal display device of a video display device, characterized in that to generate a triangular wave as shown in equation (3). Y (n) = Y (n-1) + K * A / M Here, Y (n) is a vertical triangle pie to output, n is 0, 1, 2,, M-1, K is a constant that controls the amplitude of the vertical triangle wave, A is the amplitude of the vertical triangle wave, M is the number of vertical lines. The method of claim 3, wherein the vertical S-shaped correction unit; A lookup table of data according to the frequency of the vertical synchronization signal and the horizontal synchronization signal, and the data corresponding to the frequency of the vertical synchronization signal and the horizontal synchronization signal input from the computer system in the lookup table to find the vertical A multi-mode video signal display device of a video display device, characterized by outputting an S-shaped correction signal S (n). S (n) = β * (data from lookup table) Here, β is a constant for adjusting the S-shape correction amount. The method of claim 2, wherein the high pressure control signal generator; Generates a triangular wave SAW (X) and parabolic wave P (x) of a certain period and generates low potential when SAW (X)> P (x), and generates high potential when SAW (X) <P (x). Multi-mode video signal display device of a video display device, characterized in that for generating a pulse signal by generating the above. The apparatus of claim 2, wherein the image converter comprises: a; An input buffer for storing and outputting a digital video signal output from the analog / digital converter; A horizontal expansion logic unit for horizontally expanding the size of the digital video signal stored in the input buffer according to the resolution of the cathode ray tube; A vertical expansion logic unit vertically extending the size of the digital video signal horizontally extended from the horizontal expansion logic unit according to the resolution of the cathode ray tube; And And an output buffer for storing the video signal output from the vertical expansion logic unit and outputting the video signal to the digital / analog converter.

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