KR19980061527A - Video signal switching circuit and method - Google Patents

Abstract

The present invention relates to a video signal switching circuit and a method, which detects an output of a TV video signal output from a TV tuner, a VCR video signal output from a VCR, a game machine video signal output from a game machine, and a PC video signal output from a PC. A video signal detection unit for outputting a sensed video signal, the video signal output from the video signal detection unit and the horizontal and vertical synchronization signal (H / V-SYNC) output from the PC is applied to read the applied video signal to select the video A microcomputer that outputs a signal and generates OSD data according to the selected video signal, and a TV video signal output from a TV tuner and a VCR video signal output from a VCR. Video composite signal selector to output the It is effective to display various video signals using a monitor.

Description

Video Signal Switching Circuits and Methods

The present invention relates to a video signal switching circuit and method, and more particularly, to a video signal switching circuit for detecting a video signal output from a VCR / gaming machine / PC / TV using a video signal switching circuit and selectively outputting the detected video signal. And it is about how.

In recent years, computers have tended to integrate technologies such as audio, video, TV, game consoles and communication devices into simple computers in simple arithmetic and database functions. As described above, a computer having various functions such as audio, video, TV, game machine, communication device, and the like having a hardware so as to perform the functions without difficulty is generally referred to as a multimedia computer.

With the recent expansion of such multimedia computers, computers are replacing home appliances.

As a result, compact disk ROM (CD-ROM) drivers in multimedia computers are replacing traditional VCRs.

In addition, the widespread use of digital satellite broadcasting will allow computers to perform traditional radio and satellite TV functions.

In this multi-functional multimedia computer, a sound card is installed to process sound signals as well as existing video signals.

As such, a monitor displaying data output from a multimedia computer with a built-in sound card will have a number of built-in functions to better match multimedia functions.

For example, monitors that are widely used in recent years include monitors in which speakers are integrated.

As described above with reference to the accompanying drawings, a monitor with a speaker integrated as follows.

1 is a block diagram generally illustrating an internal circuit of a monitor having a built-in speaker, and includes a central processing unit for processing a program having image and sound data and outputting a video control signal signal and a sound control signal signal; (Hereinafter referred to as a CUP) 110, a video card 120 that receives a control signal output from the CUP 110 and outputs an image signal (R, G, B), and is output from the CPU (110) A sound card 130 that receives a sound control signal and processes sound data of a program having image data and audio data and outputs a sound signal; a horizontal sync signal H-SYNC output from the video card 120; Monitor screen control signal and on-screen display according to the horizontal sync signal (H-SYNC) and the vertical sync signal (V-SYNC) applied with the vertical sync signal (V-SYNC) Display (hereinafter referred to as OSD) Microcomputer 210 for outputting an OSD gain signal according to the data, OSD unit 220 for OSD processing by receiving the OSD gain signal from the microcomputer 210 and the OSD unit ( A video preamplifier 230 that receives the OSD signal output from the 220 and the video signals R, G, and B output from the video card 120 and amplifies the signal to a predetermined level from the video preamplifier 230. A video output amplifier 240 for finally amplifying the video signal (R, G, B) and the OSD signal that is selectively output, and the video signal (R, G, B) and OSD signal output from the video output amplifier 240 A cathode ray tube (hereinafter referred to as a CRT) 250, a sound preamplifier 260 that receives a sound signal output from the sound card 130 and amplifies it to a predetermined level; Apply a sound signal output from the amplifier 260 The sound output amplifier 27 receives the final amplification and the speaker 280 receives and outputs the sound signal output from the sound output amplifier 270.

The operation according to this is as follows.

Recently, many programs having video data and audio data, such as games or moving picture programs, have been produced using a computer.

When such a program is executed, the CPU 110 in the computer main body 100 receives an execution command and receives the image signals R, G, and B through the video card 120 and the sound card 130 by the input execution command. ) And a sound signal.

The video card 120 that receives the image signal data output from the CPU 110 processes the image data and outputs the image signals R, G, and B.

The video preamplifier 210 in the monitor 200 receiving the image signals R, G, and B output from the video card 120 amplifies and outputs the image signals R, G, and B to a predetermined level. .

In this case, the video card 120 outputs a horizontal synchronizing signal H-SYNC and a vertical synchronizing signal V-SYNC for synchronizing the image signals R, G, and B.

The horizontal synchronizing signal H-SYNC and the vertical synchronizing signal V-SYNC are output from the microcomputer 210 in the monitor 200.

The microcomputer 210 receiving the horizontal synchronizing signal H-SYNC and the vertical synchronizing signal V-SYNC generates and outputs a control signal of a monitor screen according to previously stored data.

At this time, OSD data is generated according to the control signal and the OSD gain signal is output.

The OSD gain signal output from the microcomputer 210 is applied to the video preamplifier 230.

The video preamplifier 230 receiving the OSD gain signal receives the image signals R, G, and B applied from the video card 130.

The video preamplifier 230 receiving the OSD gain signal and the image signal R, G, and B signals may amplify and output the image signals R, G, and B to a predetermined level.

As such, the OSD gain signal and the image signals R, G, and B output from the video preamplifier 230 are finally amplified and output through the video output amplifier 240.

In this case, the video signals R, G, and B and the OSD signal output from the video preamplifier 230 are selectively output according to the OSD selection signal.

For example, when the OSD selection signal is applied to the video preamplifier 230, the video preamplifier 230 outputs an OSD signal. As such, the OSD signal output from the video preamplifier 230 is finally amplified by the video output amplifier 240 and displayed on the CRT 250.

As the OSD signal is displayed on the CRT 250, the user views the OSD screen and controls the screen state of the monitor.

On the contrary, if the OSD selection signal is not applied, the video preamplifier 230 outputs the image signals R, G, and B.

The video output amplifier 240 receiving the image signals R, G, and B output from the video preamplifier 230 is finally amplified and displayed on the CRT 250.

On the other hand, the sound card 130 receives the sound data output from the CPU 110 is processed to output the sound data as a sound signal.

The sound signal output from the sound card 130 is amplified to a predetermined level through the sound preamplifier 260. The sound signal amplified to a predetermined level through the sound preamplifier 260 is finally amplified and output through the sound output amplifier 270.

The sound signal output through the sound output amplifier 270 outputs the sound signal through the speaker 280.

Multimedia monitors with built-in speaker functions are technologies that selectively output video signals from TVs, VCRs, game consoles, and PCs in order to effectively use many of the functions of the multimedia computers that are being multifunctional in the future. There is a problem that needs to be secured.

Accordingly, an object of the present invention is to provide a video signal switching circuit and apparatus capable of selectively outputting a video signal output from a VCR / game console / PC / TV to a monitor.

1 is a block diagram showing an internal circuit of a multimedia monitor generally used;

2 is an internal block diagram of a monitor including a video signal switching circuit according to the present invention;

3 is a block diagram showing in detail the VCR / game machine / PC / TV video signal switching circuit shown in FIG.

4 is a circuit diagram illustrating in detail a video signal detector shown in FIG. 3;

5 is a block diagram showing in detail the OSD unit shown in FIG.

6 is a front view showing the front appearance of the monitor according to the present invention;

7 is a schematic diagram schematically showing the appearance of the back of the monitor according to the present invention;

8 is a flowchart illustrating a method of switching a VCR / gaming machine / PC / TV video signal according to the present invention.

2 is an internal block diagram of a monitor including a video signal switching circuit according to the present invention.

As shown, a VCR 10 that decodes a video signal stored in a video tape to output a VCR video signal and a VCR audio signal, and a game machine that executes a game program and outputs a game video signal and a game audio signal according to the executed result. 20, a PC that executes a computer program and outputs a PC video signal and a sound signal according to the result of execution, and a TV applied from a TV receiving antenna 40-1-1 that detects a TV broadcast frequency. Video composite signal selection for selecting a TV tuner 40-1 for tuning a broadcasting frequency to output a TV video signal and a TV sound signal, and for selecting a video signal output from the TV tuner 40-1 and the VCR 10. A unit 40-5 and a chroma integrated circuit (hereinafter referred to as IC) for synthesizing a color tone by synthesizing the video signal selected and output by the video composite signal selector 40-5 (40). - 6)), a double scan means 40-7 for receiving a video signal output from the Chroma IC 40-6 and modulating the input video signal to a monitor frequency, and the double scan means 40 -7) the TV video signal and the VCR video signal adjusted in step 7 and the game video signal output from the game machine 20 and the PC video signal output from the PC 30 are applied and the respective video signals are switched. A video preamplifier 40-9 for receiving a video call output from the signal switching circuit 40-8 and the video signal switching circuit 40-8, amplifying the input video signal to a predetermined level, and outputting a video signal. ), A video main amplifier 40-11 for finally amplifying the video signal output from the video preamplifier 40-9, and a video signal output from the video main amplifier 40-11.A deflection unit 40-12 which supplies a deflection current, a CRT 40-14 which receives and displays an image signal output from the video main amplifier 40-11, the VCR 10 and the game machine ( 20) audio selection means 40-21 for receiving and selecting sound signals output from the PC 30 and the TV tuner 40-1, and sound selected through the audio selection means 40-21. An audio preamplifier 40-22 for amplifying a signal to a predetermined level, an audio main amplifier 40-23 for amplifying a sound signal output from the audio preamplifier 40-22, and the audio main amplifier 40 -23) to control the input and output of the speaker 40-24 for finally outputting the sound signal output from the TV, the TV video and sound signals, the VCR video and sound signals, the PC video and sound signals, and the game machine video and sound signals. Remote to output control signal for Remote Controller; (Hereinafter referred to as a remote controller).

The operation according to this is as follows.

The TV video signal received by the TV antenna 40-1-1 receiving the TV broadcast signal is received by the TV tuner 40-1, amplified and tuned by the received TV signal, and separated into a TV video signal and a TV sound signal. To print.

The TV video signal separated and output from the TV tuner 40-1 and the VCR video signal reproduced and output from the VCR 10 are input to the video composite signal selector 40-5.

The input TV video signal and the VCR video signal are selected and output by the video composite signal selector 40-5 according to a user's selection.

For example, when the user selects the TV video signal using the remote controller 50, the video composite signal selector 40-5 outputs the TV video signal.

In addition, when the VCR video signal is selected, the VCR video signal is output through the video composite signal selector 40-5.

The TV video signal input to the video composite signal selector 40-5 is input as a composite signal in which the synchronization signal is overlapped, and the VCR video signal is input by separating the chrominance signal and the luminance signal.

In addition, the TV video signal is a signal band, horizontal, vertical deflection frequency is determined according to the specifications of the signal system (NTSC, PAL, SECAM).

Such a composite signal is limited by the horizontal and vertical synchronization signals output from the video signal and the deflection unit 40-12, and free selection of frequencies between the video band, the color carrier, and the horizontal and vertical deflection frequencies is not possible.

In addition, the VCR video signal is input by separating the chrominance signal and the luminance signal.

Accordingly, the video composite signal selector 40-5 receiving the TV video signal and the VCR video signal receives the composite signal of the TV tuner 40-1 and the VCR 10 to distinguish the TV video signal from the VCR video signal. The luminance signal is selected using a switching means, a synchronous signal separator, a combination filter, etc. (not shown) in the video composite signal selector 40-5 to select the TV video signal and the VCR video signal.

For example, if the TV video signal is selected through the switching means, the selected TV composite signal is separated through the sync signal separator, and the separated sync signal is transmitted through the microcomputer in the horizontal and vertical circuits (the monitor 40). (Not shown).

In addition, the TV composite signal except for the synchronization signal is separated into a luminance signal and a color difference signal through a combination filter.

The separated luminance signal is applied to the Chroma IC 40-6, and the remaining color difference signal is applied to the switching means.

The switching means receiving the color difference signal of the TV tuner 40-1 applies the color difference signal from which the synchronization signal is separated among the color difference signals output from the VCR 10 to the Chroma IC 40-6.

One of the color difference signal of the applied TV and the color difference signal of the VCR 10 is selected. Since the TV composite signal is currently selected, the switching means turns on the color difference signal of the TV which is applied separately from the combination filter.

Therefore, the chroma IC 40-6 receives the color difference signal and the luminance signal output from the TV tuner 40-1, and is synthesized by the chroma IC 40-6 to be R, G, B. Or it outputs as Y, RY, BY signal.

In order to display such an output signal on a wide screen, the output signal is processed through the double scan means 40-7.

That is, R, G, B signals or analog color output signals such as Y, R-Y, B-Y are converted into digital signals using an analog-to-digital converter (not shown).

The color signal converted into a digital signal is further converted into a screen signal having a ratio of 4 × 3 to a width of 16 × 9 by an aspect ratio conversion circuit (not shown).

It is then converted to an analog signal by a frequency double scanning means 40-7 and again by a D / A converter (not shown).

This results in a frequency multiplied video signal with an aspect ratio of 9:16.

In addition, when the VCR video signal is selected through the video composite signal selector 40-5, the luminance signal is selected among the VCR video signals, and the selected luminance signal is input to the chroma IC 40-6 through the combination filter. .

In addition, the color tone signal is input to the microcomputer by separating the sync signal, and the color tone signal from which the remaining sync signal is separated is applied to the switching means.

The switching means which receives the color tone signal from which the synchronization signal is separated among the VCR video signals inputs the color difference signal of the VCR to the color tone circuit by the microcomputer.

The luminance signal and the hue signal of the VCR 10 are synthesized by the chroma IC 40-6, and output as R, G, B or Y, R-Y, and B-Y signals.

This output signal is converted into an analog signal again by a D / A converter via a double scanning means 40-7. This results in a frequency multiplied video signal with an aspect ratio of 9:16. The TV and VCR video signals multiplied by the double scan means 40-7 are switched through the video signal switching circuit 40-8.

The video signal switching circuit 40-8 outputs the TV or VCR video signal when the TV or VCR video signal is selected, and selects the PC video signal when the PC video signal is selected.

When the PC video signal or the TV or VCR video signal is selected through the video signal switching circuit 40-8, the selected PC video signal or the TV or VCR video signal is applied to the video preamplifier 40-9.

The video preamplifier 40-9 receiving the PC video signal or the TV or VCR video signal amplifies the input video signal to a predetermined level and outputs an image signal.

The video signal output from the video preamplifier 40-9 is finally amplified through the video main amplifier 40-11 and applied to the CRT 40-14.

The applied image signal displays an image on the CRT 40-14 by the deflection current applied from the deflection unit 40-13.

In addition, the game video signal output from the game machine 20 is output to the CRT 40-14 through the same operation process as the PC video signal output from the PC (30).

On the other hand, sound signals output from the TV tuner 40-1, the VCR 10, the game machine 20, and the PC 30 are selected through the audio selecting means 40-21.

The audio selecting means 40-21, which receives sound signals output from the TV tuner 40-1, the VCR 10, the game machine 20, and the PC 30, selects each sound signal by the user's selection. Will print.

The sound signal selected and output through the audio selecting means 40-21 is amplified by the audio preamplifier 40-22 and the audio main amplifier 40-23 and output through the speaker 40-24.

The operation of selecting and outputting a video signal as described above will be described with reference to the accompanying drawings.

FIG. 3 is a detailed block diagram of the VCR / gaming machine / PC / TV video signal switching circuit shown in FIG. 2.

As shown, a TV tuner 40-1 in the monitor 40 that receives a TV broadcast frequency and outputs a TV video signal according to the applied TV broadcast frequency, and an image signal recorded on an image signal recording medium such as a video tape. A VCR 10 for outputting a VCR video image signal, a game machine 20 for executing a game program and outputting a game machine video signal according to the executed game program, and executing a moving image program and a PC according to the executed result. A PC 30 for outputting a horizontal synchronizing signal H-SYNC and a vertical synchronizing signal V-SYNC for synchronizing a video signal with a PC video signal, and a TV video signal output from the TV tuner 40-1. And a VCR video signal output from the VCR 10, a game video signal output from the game machine 20, and a PC video signal output from the PC 30. A video signal detector 40-2 for outputting a video signal, a video signal output from the video signal detector 40-2, and horizontal and vertical synchronization signals H / V-SYNC output from the PC 30. The microcomputer 40-3 outputs a video selection signal by reading the applied video signal and generates OSD data according to the selected video signal, a TV video signal output from the TV 40-1, and the VCR. A video composite signal selector 40-5 which selects and applies an applied TV video signal and a VCR video signal and outputs the selected video signal, and outputs the selected video signal; 5) a chroma IC 40-6 for adjusting a color tone by receiving a video signal selected and outputted in step 5), a video signal output from the chroma IC 40-6, and the game machine 20; Output from Receiving a game machine video signal and a PC video signal output from the PC 40-1 and receiving a video selection signal output from the microcomputer 40-3 and selectively outputting a video signal according to the applied video selection signal The OSD unit 40-4 which receives the OSD signal according to the video signal selection output from the microcomputer 40-3 and the microcomputer 40-3 and outputs an OSD gain signal according to the applied OSD data. And a video preamplifier 40-9 for selectively amplifying the OSD gain signal output from the OSD unit 40-4 and the video signal output from the video signal switching circuit 40-8 to a predetermined level. A video main amplifier 40-11 which finally amplifies the video signal output from the video preamplifier 40-9 and a video signal output from the video main amplifier 40-11 are displayed. It consists of the CRT 40-14.

Referring to the operation according to the configuration as follows.

When the user mounts the video tape on the VCR 10 to view a movie or moving picture, the VCR video signal and the VCR video detection signal recorded on the video tape are output.

In addition, the game machine 20 outputs a game video signal and a game video detection signal according to the result of executing the game program.

The PC 30 outputs the PC video signal and the PC video detection signal generated by the PC 30, and the TV video signal and the TV video detection signal output from the TV tuner 40-1, respectively.

In this way, the video signal detection units 40-2 in the monitor 40 detect the respective video detection signals output from the VCR 10, the game machine 20, the PC 30, and the TV tuner 40-1. .

That is, the video detection signal output from the VCR 10, the game machine 20, the PC 30, and the TV tuner 40-1 is sensed, and a video signal is connected to the current monitor 40 according to the detected result. Will be judged.

The video detection signal detected by the video signal detection unit 40-2 is applied to the microcomputer 40-3.

As described above, the microcomputer 40-3 receiving the video detection signal outputs a video selection signal according to the applied video detection signal.

In other words, when the user presses a button for switching the video signal to the front function buttons (not shown) mounted on the monitor outer case to view the desired video screen, the button for switching the video signal is The button signal according to the video signal switching is output.

The microcomputer 40-3 receiving the output button signal outputs a video selection signal according to the detected video detection signal.

At this time, when the video signal detection unit 20 detects the TV video detection signal output from the TV tuner 40-1 receiving the TV broadcast signal, the detected TV video detection signal is applied to the microcomputer 40-3.

The microcomputer 40-3 receiving the TV video detection signal applies the video selection signal corresponding to the applied TV video signal detection signal to the video composite signal selection unit 40-5.

The video composite signal selector 40-5 receiving the video selection signal receives the TV video signal applied from the TV 40-1.

Therefore, the video composite signal selector 40-5 receives the TV video selection signal applied from the microcomputer 40-3 to output the TV video signal.

The output TV video signal is to be tinted through the chroma IC 40-7.

The TV video signal whose color tone is adjusted to the chroma IC 40-6 is applied to the video signal switching circuit 40-8.

The video signal switching circuit 40-8 receiving the TV video signal receives the video selection signal corresponding to the TV video signal from the microcomputer 40-3 and outputs the TV video signal.

The TV video signal selected and output from the video signal switching circuit 40-8 is applied to the video preamplifier 40-9, amplified to a predetermined level, and output.

The TV video signal amplified to a certain level through the video preamplifier 40-9 is finally amplified through the video main amplifier 40-11 and applied to the CRT 40-14.

The CRT 40-14 receiving the TV video signal displays an image signal corresponding to the applied TV video signal on a monitor screen to watch a TV program.

Meanwhile, if the TV video signal is not detected by the video signal detector 20, the microcomputer 40-3 outputs OSD data according to the TV video signal.

That is, it generates OSD data indicating that the TV video signal is not detected for a predetermined time. The OSD data generated as described above is applied to the OSD unit 40-4.

The OSD unit 40-4, which receives the OSD data indicating that the TV video signal is not detected for a predetermined time, processes the applied OSD data to generate an OSD gain signal.

The OSD gain signal generated by the OSD unit 40-4 is applied to the video preamplifier 40-9, amplified to a predetermined level, and applied to the video main amplifier 40-11. The video main amplifier 40-11 receiving the OSD signal for indicating that the TV video signal is not detected for a predetermined time is finally amplified and applied to the CRT 40-14.

The CRT 40-14 receiving the OSD gain signal displays the applied OSD screen. In other words, a TV video signal detection error message is displayed on the monitor screen for a predetermined time.

The user who sees such an OSD screen checks whether the TV tuner 40-1 operates normally.

In addition, the VCR video signal and the VCR video detection signal output from the VCR 10 are also displayed on the monitor screen through an operation process such as the TV video signal and the TV video detection signal.

On the other hand, the game video signal and the PC audio signal output from the game machine 20 and the PC 30 are applied to the video signal switching circuit 40-8.

In addition, the video signal detector 40-2 receiving the game video detection signal and the PC audio detection signal outputs a video selection signal corresponding to each of the applied video detection signals.

The microcomputer 40-3 that receives the game video detection signal and the PC video detection signal output from the video signal detection unit 40-2 outputs a video selection signal corresponding to each of the applied video detection signals.

In this way, the video signal switching circuit 40-8 receiving the video selection signal output from the microcomputer 40-3 outputs the video signal according to the applied video selection signal.

For example, when a game video selection signal is applied from the microcomputer 40-3, the video signal switching circuit 40-6 outputs a game video signal applied from the game machine 20.

In addition, when the PC video selection signal is applied from the microcomputer 40-3, the video signal switching circuit 40-8 selects and outputs the PC video signal applied from the PC 30.

As described above, the game video signal and the PC video signal output through the video signal switching circuit 40-8 are amplified by the video preamplifier 40-9 and the video main amplifier 40-11, and the CRT 40-14. To be applied.

In this way, the game machine video signal and the PC video signal applied to the CRT 40-14 are displayed through the CRT 40-14.

Also, if the VCR video detection signal, the game video detection signal, and the PC detection signal are not detected by the video signal detection unit 40-2, a detection error message is displayed through the same operation as when the PC video detection signal is not detected. The screen will be displayed.

That is, the message VCR video signal detection error (Error), game video signal detection error (Error), PC video signal detection error (Error) is displayed, so that the user VCR 10, game machine 20, PC 30 It is checked whether the jack and the connector for connecting the video signal outputted from the terminal are properly connected.

As described above, the video signal detection unit 40-2 for detecting the video signal in the video signal switching circuit 40-8 will be described in detail with reference to the accompanying drawings.

4 is a circuit diagram illustrating in detail a video signal detector illustrated in FIG. 3.

As shown, the terminal T1 receives the TV video signal and outputs the applied TV video signal, the terminal T2 receives the VCR video signal and outputs the applied VCR video signal, and the game applied with the game video signal applied. A terminal T3 for outputting a video signal, a terminal T4 for receiving a PC video signal and outputting an applied PC video signal, and a horizontal and vertical synchronizing signal applied with a horizontal and vertical synchronizing signal (H / V-SYNC) H-V-SYNC output terminal T5 and a video signal detection unit 40- that detects a video signal output from each of the terminals T1, T2, T3, T4 and T5 and outputs the detected video detection signal. 2), a button 40-3-1 for outputting a button signal for selecting a video switching function, and a video switching function outputted from the button 40-3-1. Receiving a button signal to select A microcomputer 40-3 which outputs OSD data according to a video selection signal and a video detection signal according to the video detection signal applied by the video signal detection unit 40-2, and an OSD output from the microcomputer 40-3. The OSD unit 40-4 receives the data and outputs an OSD gain signal according to the applied OSD data.

During the configuration, the video signal detector 40-2 includes a transistor Q1 for amplifying a weak TV video signal to detect a TV video signal, and a transistor Q2 for amplifying a weak VCR video signal to detect a VCR video signal. ), A plurality of resistors R1 to R4, and a plurality of capacitors C1 to C4.

Referring to the operation according to the configuration as follows.

The TV video signal applied through terminal T1 is applied to the base end of transistor Q1 through a low pass filter consisting of capacitor C1 and resistor R1.

The transistor Q1 receiving the TV video signal at the base end amplifies the applied TV video signal and amplifies the weak TV video signal and outputs the same to the collector end.

At this time, the capacitors C2 and C3 are used for smoothing, and the DC voltage (+ V) is used as the driving voltages of the transistors Q1 and Q2. The TV video signal applied through the terminal T1 is amplified through the transistor Q1 and applied to the microcomputer 40-3.

In addition, the VCR video signal applied through terminal T2 is applied to the base end of transistor Q2 through a low pass filter consisting of capacitor C4 and resistor R3. Since the VCR video signal such as the TV video signal is weak, it is amplified and output through the transistor Q2.

As such, the VCR video signal detected and output by the video signal detector 40-2 is applied to the microcomputer 40-3. The game video signal, the PC video signal, and the horizontal and vertical synchronization signals H / V-SYNC respectively output through the terminals T3, T4, and T5 are applied to the microcomputer 40-3.

In this way, the microcomputer 40-3 receiving the video signal and the horizontal and vertical synchronizing signal H / V-SYNC applied through the respective terminals T1 to T5 is connected to the button 40-3-1. The button signal is applied, and each video signal is output.

That is, the video signal selected by the button is output.

At this time, if the video signal selected by the microcomputer 40-3 is not received, the microcomputer 40-3 generates OSD data accordingly.

In this way, the OSD data generated by the microcomputer 40-3 is applied by the OSD unit 40-4.

The OSD unit 40-4 receiving the OSD data processes the applied OSD data and outputs an OSD gain signal.

The OSD gain signal thus output is displayed on the CRT 40-14 (shown in FIG. 3) to indicate to the user that the video signal currently selected by the user is not detected.

As described above, an OSD unit generating an error message when the video signal is not detected when the video signal is detected will be described in detail with reference to the accompanying drawings.

FIG. 5 is a detailed block diagram illustrating the OSD unit of FIG. 3.

As shown, when the user uses to select the OSD function, the button 40-3-1 outputs a button signal according to the use, and is applied from the button 40-3-1. The microcomputer generates OSD data according to the applied video detection signal according to the button signal according to the selected OSD function and receives the video detection signal according to the detection to the button signal and the video signal according to the OSD selection. 40-3, a video signal switching circuit 40-8 for receiving a video signal and selectively outputting the applied video signal according to a video selection signal applied from a microcomputer 40-3, and the microcomputer 40; -3) OSD processing the OSD data output from the OSD to output the OSD gain signal, the horizontal flyback signal (H-FLB) is applied to the level of the applied horizontal flyback signal (H-FLB) OSD I outputting OSD gain signal accordingly The buffer unit 40-4-2 which receives the C 40-4-1 and the OSD gain signal output from the OSD IC 40-4-2 and temporarily stores the applied OSD gain signal to delay the output. ) And a horizontal flyback signal H− applied to the image signals R, G, and B applied to the image signals R, G, and B output from the video signal switching circuit 40-8. The video preamplifier 40 amplifies and outputs the image signals R, G, and B to a predetermined level according to the level of the FLB and the blanking signal BLK applied from the OSD IC 40-4-1. -9), the video signals R, G, and B output from the video preamplifier 40-9, and the OSD gain signals stored in the buffer unit 40-4-2 are applied to the video preamplifier ( A mixer unit 40-10 for synthesizing with the image signals R, G, and B applied from 40-9, and an image signal R, G, and B synthesized and output from the mixer unit 40-10. And video main amplifiers (40-11) for final amplification of the OSD signal And a bias circuit 40-13 that receives the image signals R, G, and B output from the video main amplifier 40-11 and an OSD signal and biases the applied OSD signal to a predetermined voltage. ) And a CRT 40-14 which receives and displays an image signal R, G, B applied through the bias circuit 40-13 and an OSD signal.

Referring to the operation according to the configuration as follows.

The user selects a button 40-3-1 having a video signal switching function to select a desired program using the monitor.

When such a button 40-3-1 is selected, a button signal corresponding to the video signal switching function is output from the button 40-3-1.

In this way, the button signal output from the button 40-3-1 is applied to the microcomputer 40-3.

The microcomputer 40-3 receiving the button signal according to the video signal switching function generates OSD data according to the video detection signal according to the applied button signal.

The generated OSD data is applied to the OSD IC 40-4-1 in the OSD unit 40-4 to process the OSD gain signal.

On the other hand, the video signal is received and the applied video signal is applied to the video selection signal applied from the microcomputer 40-3 to select the video signal according to the video selection signal.

That is, the video signal selected according to the applied video selection signal is output as the image signals R, G, and B.

In addition, a horizontal flyback signal (H-FLB) induced from a horizontal retrace pulse and a blanking gate of the OSD IC 40-4-1 in the OSD unit 40-4. The video preamplifier 40-9 controls the output of the image signals R, G, and B according to the level of the blanking signal output from the stage.

In other words, when a low level signal is applied to the blanking gate of the video preamplifier 40-9, the inside of the video preamplifier 40-9 becomes low level, that is, zero, so that the image signals R, G , Will block the output of B).

On the contrary, when a high level signal is applied to the blanking gate of the video preamplifier 40-9, the inside of the video preamplifier 40-9 is in a normal state, that is, 1, so that the image signals R, G, and B ) Will be printed.

As such, when the video preamplifier 40-9 is in the high level state, the video signals R, G, and B are normally amplified by the video main amplifier 40-11 and applied to the CRT 40-14. An image corresponding to the video signals R, G, and B is displayed on the CRT 40-14.

On the other hand, if the blanking signal and the horizontal flyback signal (H-FLB) applied from the OSD IC 40-4-1 blanking stage BLK are low level signals, then the video preamplifier The inside of the 40-40 is at the low level, that is, the zero level, so that the output of the image signals R, G, and B is cut off.

As such, when the video signals R, G, and B are cut off and muted in the video preamplifier 40-9, the R signal output terminal, the G signal output terminal, and the B signal of the OSD IC 40-4-1 are muted. The buffer unit 40-4-2 temporarily storing the OSD R, G, B gain signals respectively output from the signal output stage applies the OSD R, G, B gain signals to the mixer 40-10. .

The mixer unit 40-10 receiving the OSD R, G, B gain signals receives the first-level amplified image signal (R, G, B) level signal from the video preamplifier 40-9 and the OSD R, G, B The gain signal is synthesized and output.

The OSD R, G, B gain signals thus output are finally amplified through the video main amplifier 40-11.

The OSD signal amplified and output through the video main amplifier 40-11 is biased to a predetermined level through the bias circuit 40-13 and applied to the CRT 40-14.

The CRT 40-14 receiving the OSD signal applied from the bias circuit 40-14 displays the applied OSD signal.

When the video signal selected by the user is not displayed on the monitor screen through the OSD operation, a message indicating a video signal detection error is displayed.

As described above, a button 40-3-1 for selecting a video signal and displaying information of the video signal according to the selection, a VCR 10 (shown in FIG. 3), and a game machine 20 (FIG. 3, the external connection means for connecting the video signal applied from the PC 30 (shown in Figure 3) with reference to the accompanying drawings as follows.

6 is a front view showing the front appearance of the monitor according to the present invention.

As shown, the front part of the monitor with a built-in speaker, the speaker (1-1, 1-2), the power button (2), and a front control panel for controlling various functions of the monitor (Front Control Pannel) (3) is shown.

The front control panel 3 provides buttons for controlling contrast, brightness, horizontal / vertical size of the monitor screen size, horizontal / vertical position, and the like. Doing.

In addition, a button (4) for selecting a video switching function is provided, and when a remote control of a video signal using a remote controller 50 (shown in FIG. 2), the remote controller receives a light signal according to the control. The light receiving part 5 is shown.

A terminal for input / output of a video signal will be described with reference to the accompanying drawings.

Figure 7 is a schematic diagram schematically showing the appearance of the back of the monitor according to the present invention.

As shown, a sound input port 6 for receiving an external sound signal, and a connector for receiving a PC video signal and a horizontal and vertical sync signal (H / V-SYNC) ( 7) is shown.

In addition, when the external TV receiving tuner (not shown in E) is provided, the terminal T1 for receiving the TV video signal applied from the external TV receiving tuner is shown.

The terminal T2 8-1 for receiving the VCR video signal and the terminal T3 8-3 for receiving the game video signal applied from the game machine 30 (shown in FIG. 3) are shown.

A method for switching a video signal applied through such a terminal will be described with reference to the accompanying drawings.

8 is a flowchart illustrating a method of switching a VCR / gaming machine / PC / TV video signal according to the present invention.

As shown, a start step S61 for switching the video signal, and a video signal input step through which the video signal is connected to the monitor 40 (shown in FIG. S62, a video signal selection step S63 for selecting a video signal input in the video signal input step S62, and a video signal selected when the user selects a desired video signal through the video signal selection step S63. If a video selection signal detection determination step (S64) for determining whether a signal has been detected or a video signal selected through the video selection signal detection determination step (S64) is not detected, a video signal detection error message is displayed on the OSD screen. OSD step (S65) and the OSD step (S65) waits for a predetermined time to display a video signal detection error (Error) message and then video again The video selection signal detected when the video selection signal is detected in the predetermined time wait determination step (S66) for determining whether the selection signal has been detected, the video selection signal detection determination step (S64) and the predetermined time wait determination step (S66). A video selection signal output (S67) for outputting a video signal, a video signal output step (S68) for outputting a selected video signal when the video signal is selected in the video selection signal output step (S67), and the video signal output step (S68). In step S69, if the video signal is outputted and the video selection signal is not detected after the predetermined time wait determination step (S66), the video signal switching is terminated.

Such steps are described with reference to FIG. 3 and are as follows.

In order to view a video signal desired by a user, a remote controller 50 (shown in FIG. 2) and a button mounted on an outer case of the monitor 40 will be used.

At this time, the user connects the video reproducing apparatus such as the VCR 10, the game machine 20, the PC 30, and the like to the video signal input terminal connected to the monitor 40 through the start step S61.

In this way, when the video image reproducing apparatuses such as the VCR 10, the game machine 20, the PC 30, and the like are connected through the start step S61, the video signal detection unit 40-2 receives a video signal applied thereto.

In other words, the video signal input step S62 is executed.

When the video signal input step S62 is executed, the VCR video signal, the TV video signal, the game video signal, and the PC video signal are applied to the video signal switching circuit 40-8.

As such, when each video signal is input, the user selects a desired video signal through the video signal selection step S63.

For example, when the PC video signal currently executed and applied to the PC 30 is displayed on the monitor 40, the TV video signal can be selected for watching a TV program.

At this time, if the PC video signal is not selected, the video signal input step S62 is moved.

When the TV video signal is selected through the video signal selection step S63, the selected TV video signal is detected.

That is, it is determined whether the TV video signal selected through the video selection signal detection step S64 is normally applied through the TV tuner 40-1.

Therefore, when the TV video signal is normally detected, the TV video selection signal for selecting the TV video signal is output through the video selection signal output step S67.

According to the output video selection signal, the microcomputer 40-3 outputs the TV video selection signal.

The TV video selection signal outputs the selected TV video signal through the video signal output step S68.

At this time, if the TV video signal is not detected, the OSD video detection error (Error) message is displayed on the OSD screen of the monitor 40 through the OSD step (S65).

If a TV video signal detection error message is displayed, the user may determine whether the TV tuner 40-1 is operating properly.

In addition, if a failure occurs in the TV tuner 40-1 or the connection terminal is not properly connected, the repair or connection terminal is correctly connected to the monitor 40.

This OSD step (S65) is displayed for a predetermined time through the predetermined time wait determination step (S66).

If a TV video signal is detected while being displayed for a predetermined time, it is reselected through the video selection signal output step S67 to output the TV video selection signal.

The TV video signal is output through the video signal output step S68 in accordance with the TV video selection signal thus output.

When the TV video signal output is terminated, the process is terminated through an end step S68 of terminating the video signal switching.

In addition, if the video selection signal is not detected in the wait time determination step S66, the video signal switching is terminated through the termination step S69.

The VCR video signals, game video signals, and PC video signals other than the TV video signals are selected and output in the same manner.

As described above, the present invention provides a means and a method for converting video signals in a monitor, thereby displaying various video signals using the monitor.

Claims (4)

A video signal detector for detecting an output of a TV video signal output from a TV tuner and a VCR video signal output from a VCR, a game video signal output from a game machine, and a PC video signal output from a PC, and outputting the detected video signal; The video signal output from the video signal detection unit and the horizontal and vertical sync signal (H / V-SYNC) output from the PC are applied to read the applied video signal to output a video selection signal, and to display OSD data according to the selected video signal. A video composite signal selector configured to select a generated microcomputer, a TV video signal output from a TV tuner, a VCR video signal output from a VCR, and to receive the applied TV video signal and a VCR video signal and output the selected video signal; In the composite signal selector, A chroma IC for receiving color adjustments, a video selection signal output from the chroma IC, a video signal output from the game machine, and a video signal output from the PC, and a video selection signal output from the micom; And a video signal switching circuit for selectively outputting a video signal according to the applied video selection signal, and receiving OSD data according to the video signal selection output from the microcomputer and outputting an OSD gain signal according to the applied OSD data. An OSD unit, a video preamplifier for selectively amplifying an OSD gain signal output from the OSD unit and a video signal output from the video signal switching circuit to a predetermined level, and finally amplifying the video signal output from the video preamplifier A video main amplifier, the video main amplifier And a CRT that receives and displays a video signal output from the program. The method of claim 1, The video signal detector may include a terminal T1 receiving a TV video signal and outputting an applied TV video signal, a terminal T2 receiving a VCR video signal and outputting an applied VCR video signal, and a game video signal. And a terminal T3 that is applied and outputs the applied game video signal, and a terminal T4 that is applied to the PC video signal and outputs the applied PC video signal. The method of claim 1, And the video signal detector comprises a transistor (Q1) for detecting a TV video signal and a transistor (Q2) for detecting a VCR video signal. A video signal input step of inputting a video signal, a video signal selection step of selecting a video signal input in the video signal input step, and the selected video signal is selected when the user selects a desired video signal through the video signal selection step. A video selection signal detection determining step of determining whether a video signal is detected; an OSD step of displaying a video signal detection error message on an OSD screen if a video signal selected through the video selection signal detection determining step is not detected; and the OSD step Waits for a predetermined time to display a video signal detection error message in the predetermined time wait determination step of determining whether a video selection signal is detected again, in the video selection signal detection determination step and the predetermined time wait determination step The video select signal is detected And a video signal output step of outputting a surface detected video selection signal and a video signal output step of outputting a selected video signal when a video signal is selected in the video selection signal output step.