JPH08202321A - Television personal computer - Google Patents

Abstract

PURPOSE: To provide a television personal computer performing a changed over display between a personal computer picture and a television video with simple constitution. CONSTITUTION: After an input television video signal S1 is demodulated into a luminance signal and a chromacity signal is a chrominance signal demodulation circuit 101, they are inputted to a matrix circuit 102 to obtain the signal of three-primary colors and the signal is made to be a digital video signal by an analog-digital conversion circuit 103 and the digital signal is inputted to a FIFO 108. In the FIFO 108, the synchronizing frequency of the input video signal is converted into a display synchronizing frequency of a personal computer picture to be inputted to a display control circuit 106 controlled by a CPU 105. On the other hand, the synchronizing signal of the television video signal obtained by using a synchronizing signal separating circuit 104 is also inputted to the display control circuit 106 to attain a synchronization with the television video. Thus, video displays such as the display of a personal computer full screen, the display of a television full screen, the superimposed display between both screens and so forth are obtained by outputting a television video signal and a personal computer picture signal while changing over them in the display control circuit 106.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television personal computer for easily displaying a television image on a single synchronized personal computer display monitor by switching the personal computer image.

[0002]

2. Description of the Related Art FIG. 6 is a schematic block diagram of a conventional example of a television personal computer which displays a video image on a personal computer monitor. The input NTSC television video signal S1 to be displayed is first demodulated into a luminance signal and a chromaticity signal by the color signal demodulation circuit 1 and then input to the matrix circuit 2 to generate the three primary color signals R.
Converted to (red) G (green) and B (blue). Then, it is input to the analog / digital conversion circuit 3 to obtain a digital video signal. This digital video signal is sent to the CPU
It is input to the display control circuit 6 controlled by 5. A sync signal obtained from the brightness signal by using the sync signal separation circuit 4 is also input to the display control circuit 6 to achieve synchronization with the television video signal. In the display control circuit 6, the digital video signal and C
Under control of the PU 5, the personal computer image signal input via the data bus S2 is switched and stored in the video RAM 7 for storing display image data, and this is used as a refresh signal to output a digital video signal. The digital video signal is converted into an analog signal by the digital / analog conversion circuit 8 and is supplied to the video monitor 9 so that a video display such as a full screen of a personal computer, a full screen of a television and superimposing of both screens can be obtained. However, with this configuration, what kind of display is performed is determined by the application software of the personal computer, and therefore it is not possible to display the television image at any time during execution of any software. Further, when the television image is reduced and displayed at an arbitrary position, there is a problem that a processing by a dedicated program is required.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and relates to a personal computer television capable of easily switching between a personal computer image and a television image.

[0004]

[Means for Solving the Problems] 2-port FIFO (Firs
t In First Out) Memory is provided to switch and display PC image signals and TV image signals.

A switching command mechanism from the outside and a switching mechanism between the personal computer image signal and the FIFO (First In First Out) output signal are provided, and the personal computer image signal and the television video signal are switched and displayed by the switching command from the outside. To do.

A video signal gate mechanism is provided to switch between a personal computer image signal and a television video signal for display at an arbitrary display position.

The read clock signal of the FIFO (First In First Out) memory is the same as the clock of the personal computer image signal.

A FIFO (First In First Out) memory is a one-line memory.

PC image display function and PIP (Pictur I
n Pictur) It has a controller and displays a reduced video signal in a computer image.

A switching command mechanism from the outside is provided, and a personal computer image signal and a television video signal are switched and displayed by the switching command from the outside.

A general-purpose PIP (Pictur In Pictur) controller is provided with a 1 / 4-screen video RAM, and displays a reduced screen or a full screen of 1/4 of the television screen at maximum.

A personal computer image signal synchronizing signal and a television image signal synchronizing signal switching mechanism are provided. When only the personal computer image is displayed, the personal computer image synchronizing signal is used, and when the television image signal is displayed, the television image signal is used. Switch to each sync signal of the signal and display.

[0013]

A 2-port FIFO (First In First Out) memory is provided, and a television personal computer can be displayed with a simple configuration by switching and displaying a personal computer image signal and a television video signal.

A switching command mechanism from the outside and a switching mechanism between the personal computer image signal and the FIFO (First In First Out) output signal are provided, and the personal computer image signal and the television video signal are switched and displayed by the switching command from the outside. By doing so, it is possible to switch to the TV or video image display at any time regardless of the application software running on the personal computer.

By providing a video signal gate mechanism and switching between a personal computer image signal and a television video signal for display at an arbitrary display position, the video signal can be switched and displayed at an arbitrary location with a simple structure.

By setting the read clock signal of the FIFO (First In First Out) memory to be the same as the clock of the personal computer image signal, the disturbance of synchronization at the time of switching is eliminated.

By using a FIFO (First In First Out) memory as a one-line memory, an initial function can be achieved with a minimum scale memory.

PC image display function and general-purpose PIP (Pict
ur In Pictur) With a controller, by capturing and displaying the reduced video signal as PC display data,
With a simple configuration, it is possible to display reduced TV images.

A switching command mechanism from the outside and a switching mechanism between the personal computer image signal and the FIFO output signal are provided, and the personal computer image signal and the television video signal are switched and displayed by the switching command from the outside. The reduced screen of the TV image can be displayed on time.

A general-purpose PIP (Pictur In Pictur) controller is equipped with a 1/4 screen video RAM, and by switching and displaying a reduced screen or a full screen of a maximum of 1/4 of a TV screen, a minimum hardware configuration is provided. A practically sufficient reduced display function can be obtained.

A personal computer image synchronizing signal and a television image signal synchronizing signal are provided, and when only the personal computer image is displayed, the personal computer image synchronizing signal is used and when the television image signal is displayed. By switching to each sync signal of the TV video signal and displaying it, the refresh rate is increased when displaying on a PC to reduce flicker even for images with strong contrast such as text information, and when displaying the TV image, the TV sync Using signals, synchronization can be achieved with a simple configuration.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A television personal computer according to the present invention will be described in detail below with reference to the drawings. FIG. 1 shows an embodiment of a television personal computer according to the present invention. Input NTS to display
The C television video signal S1 is first demodulated by the color signal demodulation circuit 101 into a luminance signal and a chromaticity signal, and then the matrix circuit 1
02, and the three primary color signals R (red) G (green), B
Converted to (blue). Then, it is input to the analog / digital conversion circuit 103 to obtain a digital video signal. This digital video signal is a FIFO (FirstIn
First Out) is input to the memory 108. FIFO (Fir
In the st in first out) memory 108, the input video signal is read at the clock frequency corresponding to the horizontal frequency of 15.75 KHz of the input video signal, and is read at the clock frequency corresponding to the display horizontal frequency of 31.5 KHz of the personal computer image. It is input to the display control circuit 106 controlled by. This FIFO can be a one-line memory. On the other hand, a sync signal obtained from the brightness signal by using the sync signal separation circuit 104 is also input to the display control circuit 106 to synchronize with the television image. Display control circuit 10
6, a video R for storing display image data by switching between a digital video signal and a personal computer image signal input via the data bus S2 under the control of the CPU 105.
It is stored in the AM 107, and a digital video signal is output using this as a refresh signal. The digital video signal is converted into an analog signal by the digital / analog conversion circuit 109, and is supplied to the video monitor 110, so that a video display such as a personal computer full screen, a television full screen, and superimposing of both screens can be obtained. According to this configuration, the display control circuit 10
Since the video signal input to 6 is converted into the display clock of the personal computer image, a personal computer television can be constructed with a simple configuration.

FIG. 2 shows another embodiment of the television personal computer according to the present invention. The input NTSC video signal S1 to be displayed is first demodulated into a luminance signal and a chromaticity signal by the color signal demodulation circuit 201 and then input to the matrix circuit 202, and the three primary color signals R (red) G (green) and B (blue). Is converted to. Then, it is input to the analog / digital conversion circuit 203 to obtain a digital video signal. This digital video signal is input to a FIFO (First In First Out) memory 208 at a clock frequency corresponding to a horizontal frequency of 15.75 KHz of a television video signal, and read out at a clock frequency corresponding to a display horizontal frequency of a personal computer image of 31.5 KHz. Then, it is input to one input terminal of the digital video switch 209. This FIFO can be a one-line memory. Display control circuit 2 controlled by CPU 205
A personal computer image signal is output from 06 and input to the other side of the digital video switching unit 209. The digital video switching device 209 is a switching signal from a switching signal generator 212 controlled by a remote controller 213, and a television video signal or a personal computer image signal is selected.
By supplying to 11, the full screen of the personal computer, the full screen of the TV, and the video display such as superimposing of both screens can be obtained. A sync signal obtained from the brightness signal by using the sync signal separation circuit 204 is input to the display control circuit 206 to synchronize with the television image. According to this configuration, the remote controller 2
A video signal or a personal computer image can be switched and displayed from the outside at an arbitrary time by means of 13.

FIG. 3 shows another embodiment of the television personal computer according to the present invention. The input NTSC television video signal S1 to be displayed is first demodulated into a luminance signal and a chromaticity signal by the color signal demodulation circuit 301 and then input to the matrix circuit 302,
The three primary color signals R (red), G (green), and B (blue) are converted.
Then, it is input to the analog / digital conversion circuit 303 to obtain a digital video signal. This digital video signal is transferred to a FIFO (First In First Out) memory 30.
8 is input at the clock frequency corresponding to the horizontal frequency of 15.75 KHz of the input video signal, is read at the clock frequency corresponding to the display horizontal frequency of 31.5 KHz of the personal computer image, and is controlled by the external remote controller to be controlled by the digital video signal gate 310. Only the video signal to be actually displayed is cut out and input to one input terminal of the OR circuit 311 for the same signal. This FIFO can be a one-line memory. On the other hand, a display control circuit 306 controlled by the CPU 305
A personal computer image signal is output from the computer, is controlled by the external remote controller, and only the display personal computer image signal is cut out by the digital video signal gate circuit 308, and is input to the other input terminal of the OR circuit 311 of the same signal. The digital video signal date circuits 310 and 308 are switching signals from a switching signal generator 314 controlled by an external remote controller 315, and a TV video signal or a personal computer image signal is cut out, and after being synthesized by the OR circuit 311, a digital / analog signal is generated. The conversion circuit 312 converts it into an analog signal and supplies it to the video monitor 313, whereby a video display such as a full screen of a personal computer, a full screen of a television, superimposing of both screens, and the like can be obtained. The synchronization signal obtained from the luminance signal by using the synchronization signal separation circuit 304 is a switching signal controlled by the external remote control signal and is controlled by the gate circuit 316. When only the personal computer image is displayed, the synchronization signal generated by the display controller 306 is used. When the video signal is displayed by using the signal, the synchronization signal of the input video signal is used to synchronize with the input video signal. With this configuration, the remote controller 315 can switch and display the video signal or the personal computer image from the outside at any time.

FIG. 4 shows another embodiment of the television personal computer according to the present invention. The input NTSC television video signal S1 to be displayed is first demodulated into a luminance signal and a chromaticity signal by the color signal demodulation circuit 401 and then input to the matrix circuit 402, where the three primary color signals R (red) G (green) and B (blue) are obtained. ) Is converted to. Subsequently, after being converted into a digital video signal by the analog / digital conversion circuit 403, the PIP (Picture In P
icture) input to the controller 408. The PIP controller 408 is placed on the personal computer image signal line generated by the display control circuit 406 under the control of the CPU 405, thins the input television image signal according to the setting of the CPU 405 to generate a reduced signal, and outputs it from the designated start position. The PIP controller 408 is equipped with a video RAM 409 that stores television video signals for a maximum of 1/4 screen, and can generate a reduced television video signal of a maximum of 1/4 screen that is practically necessary. In full-screen TV display, this video R
With a PIP controller without using AM, the display horizontal frequency of the PC image is 31.5K from the clock frequency corresponding to the horizontal frequency of 15.75KHz of the input TV video signal.
Converted to Hz and used as a display signal. In the case of full-screen display of a television video signal, a synchronization signal obtained by using the synchronization signal separation circuit 404 from the luminance signal is input to the display control circuit 406,
Synchronization with the TV image is achieved. The output of the PIP 408 is converted into an analog signal by the digital / analog conversion circuit 410, and is supplied to the video monitor 411, so that a video display such as a personal computer full screen, TV full screen, TV reduced screen, and superimpose of both screens can be obtained. . According to this configuration, the PIP controller 408 reduces the television image signal in advance and controls the display position, so that the display can be easily obtained.

FIG. 5 shows another embodiment of the television personal computer according to the present invention. The input NTSC television video signal S1 to be displayed is first demodulated by the color signal demodulation circuit 501 into a luminance signal and a chromaticity signal, and then input to the matrix circuit 502, where the three primary color signals R (red) G (green), B (blue). ) Is converted to. Then, the analog / digital conversion circuit 503
After converting it to a digital video signal in PIP (Picture
In Picture) Input to the controller 508. The PIP controller 508 is placed on the personal computer image signal line generated by the display control circuit 506 under the control of the CPU 505, and is operated by the external remote controller 514.
According to the setting of 13, the input television video signal is thinned out to create a reduced signal and output from the designated start position. The PIP controller 508 is connected with a video RAM 509 that stores a television image signal for a maximum of 1/4 screen, and can display a reduced television image of a maximum of 1/4 screen that is practically necessary.
When displaying on a full-screen TV, the PIP controller does not use this video RAM and uses the clock frequency corresponding to the horizontal frequency of 15.75 KHz of the input TV video signal,
The display horizontal frequency of a personal computer image is converted to 31.5 KHz and used as a display signal. When the video signal is displayed on the full screen, a sync signal obtained by using the sync signal separation circuit 504 from the luminance signal is also input to the display control circuit 506 to synchronize with the television image. With this configuration, the remote controller 514 can externally switch and display a television image or a personal computer image when an arbitrary size is desired at an arbitrary position.

[0027]

As described above, the television personal computer according to the present invention can display the television personal computer with a simple structure by using the FIFO or PIP. By controlling from the outside with a remote control, etc., with a simple configuration, regardless of the application software running on the personal computer,
The display can be switched to a TV or video image display at any place and at any time. By synchronizing the synchronizing signal of the personal computer image signal with the synchronizing signal of the television video signal, the synchronization disorder at the time of switching is eliminated. By using the FIFO as a one-line memory, the initial function can be obtained with the smallest scale memory. The video memory equipped in the PIP has a capacity of ¼ of the screen, so that a practically sufficient reduced display function can be obtained with the minimum hardware configuration. When only the PC image is displayed, the sync signal of the PC image signal is used, and when the TV image is displayed, the sync signal of the TV image signal is used. Even when an image with high contrast such as flicker is reduced and a television image is displayed, the television synchronization signal can be used to synchronize with the television image signal by using a television synchronization signal.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of an embodiment of a personal computer television according to the present invention.

FIG. 2 is a block diagram of a main part of another embodiment of a personal computer television according to the present invention.

FIG. 3 is a block diagram of a main part of another embodiment of a personal computer television according to the present invention.

FIG. 4 is a block diagram of a main part of another embodiment of the personal computer television according to the present invention.

FIG. 5 is a block diagram of a main part of another embodiment of the personal computer television according to the present invention.

FIG. 6 is a block diagram of a main part of an embodiment of a conventional personal computer television.

[Explanation of symbols]

 S1 Input TV video signal S2 Personal computer bus signal 101 Luminance signal / chromaticity signal separation circuit 102 Matrix circuit 103 Analog / digital conversion circuit 104 Synchronous signal separation circuit 105 CPU 106 Display control circuit 107 Video RAM 108 FIFO (First In First Out) memory 109 Digital / Analog Converter 110 Video Monitor 201 Luminance Signal / Chromaticity Signal Separation Circuit 202 Matrix Circuit 203 Analog / Digital Conversion Circuit 204 Synchronous Signal Separation Circuit 205 CPU 206 Display Control Circuit 207 Video RAM 208 FIFO (First In First Out) Memory 209 Digital Video Signal Switching Circuit 210 Digital / Analog Converter 210 Video Monitor 212 Switching Control Circuit 213 Remote Control 301 Luminance Signal / Chromaticity Signal Separation Circuit 302 Mat Cux circuit 303 Analog / digital conversion circuit 304 Synchronous signal separation circuit 305 CPU 306 Display control circuit 307 Video RAM 308 Gate circuit 309 FIFO (First In First Out) memory 310 Gate circuit 310 OR circuit 312 Digital / analog converter 313 Video monitor 314 Switching control circuit 315 Remote control 315 Switching circuit 401 Luminance signal / chromaticity signal separation circuit 402 Matrix circuit 403 Analog / digital conversion circuit 404 Synchronous signal separation circuit 405 CPU 406 Display control circuit 407 Video RAM 408 PIP (Picture In Picture) controller 409 Video RAM 410 Digital / analog converter 411 Video monitor 501 Luminance signal / chromaticity signal separation circuit 502 Matrix circuit 503 Analog / digital Switching circuit 504 Synchronous signal separation circuit 505 CPU 506 Display control circuit 507 Video RAM 508 Gate circuit 508 PIP (Picture In Picture) controller 509 Video RAM 510 Switching circuit 511 Digital / analog converter 512 Video monitor 513 Switching control circuit 514 Remote control 1 Luminance Signal / chromaticity signal separation circuit 2 Matrix circuit 3 Analog / digital conversion circuit 4 Synchronous signal separation circuit 5 CPU 6 Display control circuit 7 Video RAM 8 Digital / analog converter 9 Video monitor

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area H04N 5/268 5/44 Z

Claims (9)

[Claims] 1. A personal computer having a video signal capturing function, a personal computer image display function and a two-port FIFO.
(First In First Out) A TV personal computer that has a memory and switches between the PC image signal and the TV video signal for display. 2. A switching command mechanism from the outside and a switching mechanism between a personal computer image signal and a FIFO (First In First Out) output signal, and the personal computer image signal and the television video signal are switched by the switching command from the outside. The television personal computer according to claim 1, wherein the television personal computer is displayed. 3. The television personal computer according to claim 1 or 2, further comprising a video signal gate mechanism for switching between a personal computer image signal and a television video signal for displaying at an arbitrary display position. 4. The television personal computer according to claim 1, 2 or 3, wherein the read clock signal of the FIFO (First In First Out) memory is the same as the clock of the personal computer image signal. 5. A FIFO (First In First Out) memory is a one-line memory.
The TV personal computer described in 2, 3 or 4. 6. A personal computer having a television image signal capturing function, a personal computer image display function and a PIP (Pict)
ur In Pictur) A TV personal computer equipped with a controller that displays a reduced video signal in a personal computer image. 7. The television personal computer according to claim 6, further comprising a switching instruction mechanism from the outside, wherein the personal computer image signal and the television video signal are switched and displayed by the switching instruction from the outside. 8. A PIP (Picture In Picture) controller is provided with a 1/4 screen video RAM, and a reduced screen or a full screen of a maximum of 1/4 of a television image screen is switched and displayed. TV personal computer described in 6 or 7. 9. A personal computer image signal synchronizing signal and a television image signal synchronizing signal switching mechanism are provided. When only the personal computer image is displayed, the personal computer image synchronizing signal is used, and when the television image signal is displayed, 9. The television personal computer according to claim 1, wherein the television personal computer is switched and displayed for each synchronizing signal of the television video signal.