KR0150092B1 - Image input processing circuit and method of monitor - Google Patents

Abstract

The present invention relates to a video input processing circuit of a monitor, and more particularly, to reproduce an image signal through a TV reception or an MPEG card using a computer, so that a monitor can reproduce an image brighter than a conventional monitor with the same brightness as a TV.

A part that outputs a mode signal by determining a video signal or a general monitor state through TV or MPEG through a mode determining circuit 4 by using the Yin signal input from the computer 1 to the TV / VTR video processor 3. And a power supply converter 6 for changing the power voltage output from the FBT 9 for supplying power to the image output circuit 8 according to the output mode signal.

You can watch TV signal or movie screen through the monitor, and you can see the screen with higher brightness than the existing monitor screen through the monitor.

Description

Image input processing circuit and processing method of monitor

1 is a video input processing circuit diagram of a monitor according to the present invention.

2 is a waveform diagram of a typical video input signal.

3 is a waveform diagram of a video output circuit terminal of a monitor.

3A is a waveform diagram of a saturated image output circuit.

3b is a waveform diagram of a normal image output circuit.

* Explanation of symbols for main parts of the drawings

1: Computer 2: Video Output Circuit

3: TV / VTR processor 4: Mode discrimination circuit

5 amplification unit 6 power supply conversion unit

7: Video Processor 8: Image Output Circuit

9: FBT 11: R video signal amplifier

12: G video signal amplifier 13: B video signal amplifier

14a, l4b, 14c: analog switch

OP1-OP3: Op amp R1-R9: Resistance

RL1: relay C1-C3: capacitor

The present invention relates to an image input processing circuit and a processing method of a monitor, and more particularly, when a computer receives a video signal using a TV reception or an MPEG card, a monitor can reproduce a brighter image than a conventional monitor with the same brightness as a TV. The present invention relates to an image input processing circuit and a processing method of a monitor capable of image processing of a monitor.

In the conventional case, in the monitor and the TV, the monitor was developed for text display and graphics processing, and as the TV was developed for the purpose of moving image processing, the image adjustment specification was set to high.

Accordingly, the TV brightens the image by brightening the BACK screen and increasing the gain of the image.

However, since the monitor was developed for the purpose of displaying characters and graphics, it is a method of emphasizing the image part by darkening the BACK screen. Therefore, the conventional method uses a video signal from a computer or a MPEG (Moving Picture Expert Group) card. In the case of reproducing the image, because the image is dark, if the luminance and the image gain are forcibly adjusted to brighten the image, the image appearing through the CRT becomes saturated and the screen spreads.

Accordingly, the present invention is to overcome the above-mentioned problems, the object of the present invention is to output the image processing mode signal to the monitor when using a TV card or MPEG card in the computer to the gain conversion and image output circuit in the monitor By switching the power supply voltage used to prevent the saturation of the image and to increase the brightness and image gain to provide a circuit that can feel a bright image through the monitor.

As an example for achieving the object of the present invention, a computer comprising a video output circuit for outputting an RGB signal and a mode determination circuit for determining the mode using the Yin signal input to the TV / VTR video processor, and a video output circuit When the RGB signal outputted from the system is input, and the mode signal outputted from the mode discrimination circuit is applied through the switch drive, the amplifying unit changes the gain of the video signal by an analog switch that is operated, and the mode signal is applied through the switch drive. A power supply conversion unit having a relay for switching the power voltage output from the FBT (flyback transformer), a video processor receiving an output of the amplifying unit, and processing an image signal; Also, the video output circuit receives the power voltage according to the switching of the power supply converter. And, a video input processing method of the monitor, characterized in that consisting of a monitor consisting of a cathode-ray tube is operated by the video output circuit.

In addition, according to an embodiment of the present invention, the step of outputting the R, G, B signal from the video output circuit to the amplifier, and the mode determination circuit using the Yin signal input to the TV / VTR video processor TV / VTR mode And determining the two modes of the control mode and the monitor mode. When the determination result is the TV / VTR mode, a low signal is output, and the analog switches 14a, 14b, 14c of the amplifier section are turned off, and the power supply conversion section A video input processing method of a monitor, characterized in that the step of switching from Vcc2 to Vcc1 and outputting a power supply voltage to an image output circuit.

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

Referring to FIG. 1, an image input processing circuit diagram of a monitor according to the present invention is largely divided into a computer 1 and a monitor 10. FIG.

The computer 1 comprises a video output circuit 2 for outputting an RGB signal, and a mode discrimination circuit 4 for discriminating a mode using a Yin signal input to the TV / VTR video processor 3.

The mode determining circuit 4 discriminates two modes of TV / VTR mode and monitor mode, and outputs a high signal indicating the monitor mode when the Yin signal is in VGA state, and TV / VTR mode when the Yin signal is not in VGA state. Outputs a low signal indicating.

The monitor 10 receives an RGB signal output from the video output circuit 2, an amplifier 5 for changing the gain of the video signal by the mode signal output from the mode discrimination circuit 4, and a mode. A power supply conversion unit 6 having a relay RL1 for switching the power supply voltage output from the FBT 9 (full-feedback transformer) according to the signal, and an image signal received from the output of the amplification unit 5; To a video processor 7 for processing a video signal, a video output circuit 8 connected to the video processor 7, and receiving a power supply voltage depending on whether the power supply converter is switched. It consists of a CRT operated by

The amplifier 5 includes an R video signal amplifier 11, a G video signal amplifier 12, and a B video signal amplifier 13. The R, G, and B video signal amplifiers 11, 12, and 13 respectively have op amps OP1, OP2, and OP3 for receiving a corresponding input signal from a video output circuit at a positive terminal. Three resistors are connected between the negative terminal and its output to form a non-inverting amplifier with an op amp. Moreover, the analog switch 14 is provided, respectively. The amplifier 5 configured as described above changes the output gain of the op amp by turning on and off the analog switch 14 through the switch drive U1 in accordance with the mode signal output from the mode discrimination circuit 4. It is connected to the input of the video processor 7 via, C2, C3.

The image input processing circuit of the monitor of the present invention configured as described above operates as follows.

The video output circuit 2 outputs the R, G, and B signals to the amplifier 5, and the mode determination circuit 4 uses the Yin signal input to the TV / VTR video processor 3 to output the TV / VTR. Determines two modes, mode and monitor mode.

The mode discrimination circuit 4 determines the monitor mode and the TV / VTR mode by determining the input Yin signal. That is, when the Yin signal is in the VGA state, it is determined as the monitor mode and outputs a HIGH signal, and the analog switches 14a, 14b, and 14c of the amplifier 5 are turned on. In addition, the mode discrimination circuit 4 outputs a low signal by determining that the Yin signal is in the TV / VTR mode when the Yin signal is not in the VGA state, and turns off the analog switches 14a, 14b, and 14c of the amplifier 5. OFF).

In the general monitor, since the Yin signal input to the TV / VTR video processor 3 is a video signal mainly for character display and graphic display, the horizontal frequency is 31.5 KHz or 35.5 JHz, and the vertical frequency is 56 Hz or 60 Hz, 70 Hz, It shows VGA status which is 87Hz. Therefore, in the normal VGA state, the mode discrimination circuit 4 of the computer 1 outputs a high signal corresponding to the monitor mode through the switch drive U1, and the analog switches 14a, 14b, 14c of the monitor. ) To increase the gain of the R, G, B video amplifiers (OP1, 2, 3) by (R1 + R3) / R1 (R4 + R6) / R4, (R7 + R9) / R7 times, respectively. Enter 7) and operate like normal monitor output. At this time, the power supply unit 6 applies only Vcc2 to the image output circuit 8.

That is, when the mode is the monitor mode, the switch drive U1 is driven to turn on the analog switches 14a, l4b, and 14c, and Vcc1 is short-circuited through the switch drive U2.

On the other hand, if the YIN signal is not a VGA state but a video through a TV receiving card or MPEG card, the mode discrimination circuit 4 of the computer 1 outputs a LOW signal corresponding to the TV / VTR mode. Through the switch drive U1, the analog switches 14a, 14b and 14c of the monitor are turned off to obtain the gains of the R, G and B video amplifiers OP1, 2 and 3, respectively (R1 + R2 + R3). / R1, (R4 + R5 + R6) / R4, (R7 + R8 + R9) / R7 times are made and input to the video processor 7 to process the TV / VTR video signal. At this time, the power supply unit 6 applies Vcc1 to the image output circuit 8.

That is, when the mode is a TV / VTR mode, the switch drive U1 is driven to turn off the analog switches 14a, 14b, and 14c to obtain the gains of the respective video amplifiers OP1, 2, 3 (R1 + R2). + R3) / R1, (R4 + R5 + R6) / R4, (R7 + R8 + R9) / R7 times amplified and output to CRT through video processor (7) and video output circuit (8) In this case, as the video gain is made too large, the screen may be saturated as shown in FIG. 3a.

Therefore, to compensate for this saturation phenomenon, when the relay signal RL1 is driven through the switch drive U2 to convert the power supply voltage of the image output circuit as shown in FIG. By supplying power to the video output circuit 8 by changing the power supply voltage from Vcc2 to Vccl, the video signal is output higher than that of the general monitor state, thereby improving the brightness of the screen.

As described above, the image input processing circuit of the monitor according to the present invention has the following effects.

When a TV card or MPEG card is used in a computer and the TV / VTR mode signal is output to the monitor, the monitor receives this mode signal and switches the gain in the amplifier circuit configured in the video input circuit and the power supply voltage used in the video output circuit. This prevents the saturation of the image and increases the brightness and image gain so that the user can feel the bright image even on the monitor. You can see the screen in brightness.

Claims (9)

A computer (1) comprising a video output circuit (2) for outputting an RGB signal, and a mode discrimination circuit (4) for discriminating a mode by using a Yin signal input to the TV / VTR video processor (3); When the RGB signal outputted from the circuit 2 is inputted, and the mode signal outputted from the mode discrimination circuit 4 is applied through the switch drive U1, the analog signal 14a, 14b, 14c which is activated operates the image signal. An amplifier 5 for varying the gain, and a relay RL1 for switching the power supply voltage output from the FBT 9 (flyback transformer) when the mode signal is applied through the switch drive U2. A power supply converting unit 6, a video processor 7 which receives an output of the amplifying unit 5 and processes an image signal, and is connected to the video processor 7 and whether or not the power supply converting unit is switched Image output circuit receiving power supply voltage (8) and a monitor (10) comprising a cathode ray tube operated by said image output circuit (8). 2. The mode discrimination circuit (4) according to claim 1, characterized in that the mode discriminating circuit (4) discriminates two modes of a monitor mode and a TV / VTR mode, and outputs a high signal indicating a monitor mode when the Yin signal is in a VGA state and the Yin signal is VGA. And outputting a low signal indicating a TV / VTR mode if the status is not set. The image input of the monitor according to claim 1, wherein the amplifier 5 comprises an R video signal amplifier 11, a G video signal amplifier 12, and a B video signal amplifier 13. Processing circuit. The R, G, and B video signal amplifiers 11, 12, and 13 respectively operate op amps OP1, OP2, and OP3 that receive corresponding input signals from the video output circuits at the positive terminals. And a non-inverting amplifier together with the op amp by connecting three resistors between the negative terminal of the op amp and its output. Outputting the R, G, and B signals from the video output circuit 2 to the amplifier 5, and using the Yin signal input from the mode determination circuit 4 to the TV / VTR video processor 3 Determining two modes of the / VTR mode and the monitor mode; when the determination result is the TV / VTR mode, a low signal is output, and the analog switches 14a, 14b, and 14c of the amplifier 5 are turned off. And converting from Vcc2 to Vcc1 and outputting the power supply voltage to the video output circuit in the power supply conversion section (6). 6. The switch drive U1 according to claim 5, wherein when the low signal indicating the TV / VTR mode is output from the mode determination circuit 4, the switch drive U1 drives to turn off the analog switches 14a, 14b and 14c, U2) is driven to operate the relay (RL1) image input processing method of the monitor. The output gains of the op amps OP1, 2, and 3 are respectively (R1 + R2) because the resistors R2, R5, and R8 are connected when the analog switch 14 is turned off. + R3) / R1 (R4 + R5 + R6) / R4, (R7 + R8 + R9) / R7 times The image input processing method of a monitor characterized by the above-mentioned. 6. The switch drive (U2) according to claim 5, wherein when the high signal indicating the monitor mode is output from the mode determination circuit (4), the switch drive (U1) is driven to turn on the analog switches (14a, 14b, 14c) and the switch drive (U2). Is driven so that the image output circuit is connected to the Vcc2 terminal. 9. The output gains of the op amps OP1, 2, 3 are respectively (R1 + R3) / R1, (R4 + R6) / R4, (R7 + R9) when the analog switch 14 is turned on. ) / R7 times the image input processing method of the monitor characterized by the above-mentioned.