KR19980052112A - Vertical screen size adjuster for video display with keyboard input - Google Patents

Abstract

The present invention relates to a vertical screen size adjusting device of a video display device, and more particularly, to a video display device for outputting a video signal output from a computer (video card) to a screen, by using a keyboard input device. It relates to a vertical screen resizing device that can adjust the vertical size.

The present invention provides a microcontroller for outputting a pulse width modulated (PWM) vertical scaling signal; Pulse width modulated signal demodulating means for demodulating an output signal of the microcontroller; Amplifying means for amplifying an output signal of the pulse width modulated signal demodulator; An image display apparatus having a screen vertical size adjusting means configured to include a vertical ramp generating means for varying an amplitude of a vertical ramp waveform according to an output signal of the amplifying means, the image display apparatus comprising: a signal having information about screen vertical size adjusting; A keyboard input device generated; And a central processing means for interpreting a signal generated from the keyboard input device to apply a control signal to the conventional screen vertical size adjusting circuit. By providing a, the user control device composed of the mechanical device in the conventional video display device can be omitted, thereby achieving the effect of increasing the production efficiency and reducing the production cost.

Description

Vertical screen size adjuster for video display with keyboard input

The present invention relates to a vertical screen size adjusting device of a video display device, and more particularly, to a video display device for outputting a video signal output from a computer (video card) to a screen, by using a keyboard input device. It relates to a vertical screen resizing device that can adjust the vertical size.

An image display device (usually called a monitor) that visually displays a signal output from a computer main body so that a computer user can recognize it includes a knob or a terminal for adjusting the vertical size of the screen on its front surface.

The user adjusts the vertical size of the image display apparatus by controlling the microcontroller in the image display apparatus by adjusting the knob or the terminal as necessary.

At this time, the adjustment of the vertical size of the screen of the image display apparatus is achieved by varying the amount of current flowing through the cathode ray tube vertical deflection coil of the display apparatus.

Referring to FIG. 1, the operation of the image display apparatus of the related art will be described below.

The vertical size adjusting means of the conventional image display device microcontroller 10 for outputting a vertical amplitude control signal pulse-modulated (PWM); A pulse width modulated signal demodulator (20) for demodulating the output signal of the microcontroller; An amplifier (30) for amplifying the output signal of the pulse width modulated signal demodulator (20); It includes a vertical ramp generator 40 for varying the amplitude of the vertical ramp waveform in accordance with the output signal of the amplifier 30.

The device demodulates and amplifies the waveform of the pulse width modulated signal in the microcontroller to vary the vertical width of the vertical ramp waveform, thereby adjusting the vertical size of the screen.

Operation of the vertical size adjusting means of the image display device configured as described above is as follows.

The signal input from the vertical scale terminal (not shown) is input by the microcontroller 10 to generate a pulse width modulated signal having a width (width) proportional to the size of the screen.

Since the pulse width modulated signal is composed of a 7-bit signal (1 bit is a polarity bit and 6 bits is a data bit), it has a variable range of 64 steps. FIG. 2 (a) shows the width of the pulse width modulated signal when the screen size is the smallest. FIG. 2 (c) shows the pulse width modulated signal when the screen size is the largest. It becomes the same signal as the waveform of 2 (b).

The signal output from the microcontroller 10 is demodulated by a DC component in the pulse width modulated signal demodulator 2. The DC component demodulated by the pulse width modulated signal demodulator 20 is amplified by the amplifier 30.

The vertical ramp generator 40 receives the signal recorded by the amplifier 30 as an input, and varies the amplitude of the vertical ramp waveform according to the input signal, and finally, changes the amplitude of the vertical deflection current to change the vertical size of the screen. Modulate.

Accordingly, the vertical size adjusting device of the conventional video display device requires a separate user adjusting terminal or knob on the image display device, and thus, the mechanical details of the image display device are added, thereby increasing the production cost of the device.

On the other hand, according to the trend of integrated computer main body and image display device as in the recent trend, it is not necessary to install a separate image display device vertical size adjustment terminal.

The present invention has been made to solve the above problems, it is possible to reduce the production efficiency and production cost by removing the mechanical devices used for adjusting the vertical size of the image display device, the trend of integrated computer main body, image display device It is an object of the present invention to provide an image display device having a screen vertical resizing device that is adjustable with a keyboard input device so as to meet the requirements of the present invention.

1 is a configuration diagram of a vertical screen size adjusting means of the image display apparatus of the prior art,

FIG. 2 is an output waveform diagram of a microcontroller of a vertical screen size adjusting unit of a conventional image display apparatus.

2 (a) is a waveform diagram showing an output waveform of the microcontroller when the vertical size of the screen is minimum;

2 (b) is a waveform diagram of the output waveform of the microcontroller as the vertical size of the screen changes;

2 (c) is a waveform diagram showing an output waveform of the microcontroller when the vertical size of the screen is the maximum;

3 is a block diagram of an apparatus for vertical screen size adjustment of an image display device controlled by a keyboard input device according to the present invention;

4 is a block diagram illustrating an embodiment of a screen vertical size adjusting device of an image display device controlled by a keyboard input device according to the present invention.

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

10: microcontroller 20: pulse width modulated signal (PWM) demodulator

30: Amplifier 40: Vertical ramp generator

100: keyboard input device 200: central processing unit

A: Computer body C: Video display device

B: Vertical size adjusting means of image display device

The present invention to achieve the above object is a microcontroller for outputting a pulse width modulated (PWM) vertical scaling signal; Pulse width modulated signal demodulating means for demodulating an output signal of the microcontroller; Amplifying means for amplifying an output signal of the pulse width modulated signal demodulator; An image display apparatus having a screen vertical size adjusting means comprising a vertical ramp generating means for varying an amplitude of a vertical ramp waveform in accordance with an output signal of the amplifying means, wherein the image display apparatus has a screen having vertical size adjusting information. A keyboard input device; And a central processing means for interpreting a signal generated from the keyboard input device to apply a control signal to the conventional screen vertical size adjusting circuit. To provide.

In this case, the central processing unit outputs a vertical size control signal according to a specific key combination input signal among signals input from the keyboard input device and an input signal of up and down arrow keys simultaneously input.

In this case, the screen vertical size control signal from the keyboard input device may be configured by using an auxiliary input device such as a mouse.

Operation of the vertical size adjusting device of the image display device, which is adjustable by the keyboard input device configured as described above, is as follows.

When the user needs to adjust the vertical size of the image display device, the user presses a specific key combination of the keyboard input device to inform the central processing unit that the image display device is in the vertical size adjustment mode.

The central processing means determines whether to enlarge or reduce the vertical size of the image display device according to the up and down arrow keys pressed in the vertical size adjusting mode, and applies a signal to the microcontroller in the vertical size adjusting means.

The central processing means is usually set to enlarge the screen in the case of an up arrow signal and reduce the screen in the downward direction. However, this setting can be changed according to the user's preference.

The signal output to the central processing means is applied to the microcontroller in the image display device. The microcontroller applies a pulse width modulation (PWM) signal whose width of the signal is changed in accordance with the signal applied from the central processing means to the demodulation means.

The pulse width modulated signal demodulation means demodulates a signal input from the microcontroller into a DC component.

The DC component demodulated by the pulse width modulated signal demodulating means is input to the amplifying means.

The amplifying means amplifies the input signal and applies it to vertical ramp generation. The vertical ramp generating means adjusts the vertical magnitude of the image display apparatus by controlling the vertical deflection current of the cathode ray tube of the image display apparatus by varying the amplitude of the vertical ramp waveform according to the applied signal.

EXAMPLE

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

3 is a block diagram of a screen vertical size adjusting device of an image display device controlled by a keyboard input device according to the present invention.

The user inputs data to the central processing unit 200 of the computer main body A through the keyboard input device 100 to adjust the vertical size of the image display device.

At this time, the central processing unit 200 interprets a signal input from the keyboard input device and inputs a signal (SC: serial clock, SD: serial data) corresponding thereto to the image display device (C).

4 is a block diagram illustrating an embodiment of a screen vertical size adjusting device of an image display device controlled by a keyboard input device according to the present invention.

According to the prior art, the microcontroller 10 for outputting a pulse width modulated (PWM) vertical scaling signal; Pulse width modulated signal demodulating means (20) for demodulating the output signal of the microcontroller; Amplifying means (30) for amplifying the output signal of the pulse width modulated signal demodulator; In addition to the screen vertical size adjusting means (B) configured to include a vertical ramp generating means 40 for varying the amplitude of the vertical lamp waveform in accordance with the output signal of the amplifying means 30, according to the user's selection A keyboard 100 for generating a signal having information for adjusting the size; And a central processing unit 200 which analyzes a signal having information of screen size adjustment generated from the keyboard and controls the microcontroller of the vertical size adjusting unit B of the conventional image display apparatus.

The operation of the optimum embodiment of the vertical size adjusting device of the image display device adjusted by the keyboard input device configured as described above is as follows.

The user presses a specific selection key of the keyboard input device 100 to inform the central processing unit 200 that the screen size adjustment mode. This process is performed by generating a serial clock (SC) and a serial data (SD) corresponding to a specific selection key of the keyboard input device and applying the same to the central processing unit.

The specific key may be arbitrarily changed by the user, and the central processing unit 200 may recognize the screen size control mode for a signal of pressing Alt and Ctrl keys simultaneously.

A user presses a specific key of the keyboard input device 100 to press the up or down arrow key of the keyboard input device 100 in a state in which the central processing unit 200 recognizes that the screen size is adjusted. You can choose to increase or decrease the size.

The central processing unit 200 monitors the signals SC and SD input from the keyboard input device 100, and enters a screen size control mode when a signal corresponding to a specific key is input.

In this screen resizing mode, the central processing unit 200 interprets the signal input from the keyboard input device 100 to determine whether the up arrow key or the down arrow key is applied, and sets a predetermined reference (usually the up arrow key). Is applied to the microcontroller of the vertical size adjusting means (B) of the image display device.

As an example of the present invention, as the reference, the down arrow key is preferably configured to generate a signal corresponding to the reduction of the screen and the up arrow key to the enlargement of the screen.

The signal application from the central processing unit 200 to the microcontroller of the vertical size adjusting means B is performed through a signal cable. The signal cable is formed of a 15-pin cable, where the 15th pin can be used as a spare to apply a signal.

The signal applied in this way is the same as the signal applied to the microcontroller by the user adjusts the terminal or knob as in the prior art. Therefore, the applied signal is processed according to the signal processing method of the prior art as described above to adjust the vertical size of the screen of the image display device.

In addition, in one embodiment of the present invention, the signal input device for adjusting the vertical size of the screen of the image display device is not limited to the keyboard input device 100, but is a mouse (MOUSE) or a remote control sensor attached to another auxiliary input means. In the case of remote control, it can be configured by using a remote controller.

As described above, the vertical size control device of the image display device controlled by the keyboard input device of the present invention can omit the user control device configured as a mechanical device in the conventional image display device, thereby increasing the production efficiency and reducing the production cost. To achieve.

In addition, the vertical size adjusting device of the image display device, which is adjustable by the keyboard input device of the present invention, also provides an effect in response to the trend of computer main body and monitor integration, such as the recent trend.

While the invention has been shown and described with respect to certain preferred embodiments, it will be appreciated that the invention can be modified and modified in various ways without departing from the spirit or scope of the invention as set forth in the claims below. One of ordinary skill in the art will readily know.

Claims (3)

A microcontroller 10 for outputting a pulse width modulated (PWM) vertical scaling signal; Pulse width modulated signal demodulating means (20) for demodulating the output signal of the microcontroller; Amplifying means (30) for amplifying the output signal of the pulse width modulated signal demodulator; In the image display apparatus having the vertical screen size adjusting means (B) configured to include a vertical ramp generating means 40 for varying the amplitude of the vertical ramp waveform in accordance with the output signal of the amplifying means (30), A keyboard input device 100 generating a screen vertical scaling signal; And a central processing means (200) for analyzing a signal generated from the keyboard input device (100) and applying a control signal to the conventional screen vertical size adjusting means (B). Video display device that can be controlled by a keyboard input device. The method according to claim 1, wherein the central processing unit 200 outputs a vertical size control signal according to a specific key combination input signal among signals input from the keyboard input device and an input signal of up and down arrow keys simultaneously input. A video display device, characterized in that the vertical screen size can be adjusted by the keyboard input device. The image display device of claim 1, wherein the vertical screen size adjustment signal from the keyboard input device is formed by using an auxiliary input device such as a mouse.