JPH1124640A - Internet information display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously display a television program and internet drawing despite of a simple constitution by using a graphic engine enabling high-speed drawing. SOLUTION: When a 2-screen display mode which simultaneously displays a general television program and an internet drawing is designated, an internet processing part 22a is supplied with a vertical synchronized signal, a horizontal synchronized signal, and a clock of 8fsc from a TV video horizontal compression part 18. A video signal is read out from a timing of an intermediate point of a scanning line and the read-out respective color signals R, G, B are supplied to a video left/right synthetic part 19 via a switch part. The video left/right synthetic part 19 horizontally synthesizes video signals supplied from the TV image horizontal compression part 18 and the internet processing part 22a, respectively, the synthesized video signals are supplied to the RGB matrix 15 so as to be outputted to the CRT 17 according to respective colors. This constitution allows to display the general television program on the left half of the display screen and the internet drawing on its right half, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Internet information display device for displaying a video signal in a video signal on a screen, capturing data from the Internet via a telephone line, converting the data into a video signal, and displaying the video signal on the screen. It is.

[0002]

2. Description of the Related Art The Internet is a network in which a large number of computers are connected on a worldwide scale, and each computer stores various information that can be read. This information includes e-mails, various programs, homepages, etc., and can be communicated in both directions. The homepage is a cover and a table of contents of one piece of information, and necessary information can be searched by selecting a picture (icon) and a word on the homepage.

FIG. 10 is an explanatory diagram for explaining an example of connection between each computer and the Internet.
In this connection example, the personal computer 7 is connected to a telephone line 2 via a modem 8 or a terminal adapter, and the telephone line 2 is connected to a modem 3 or a terminal adapter of a provider which is a connection service company. The modem 3 is connected to a server 4 which is a computer of the provider.

[0004] The server 4 is always connected to the Internet 6 via a router 5 for setting a relay route. The personal computer 7 makes a telephone call when necessary, and connects to the Internet 6 via the server 4 of the provider (dial-up connection). Recently, there has been proposed an Internet information display device capable of connecting to the Internet 6 instead of the personal computer 7 and displaying various information of the Internet on a screen thereof.

[0005] In the Internet, it may take time to connect to a desired information source depending on the degree of line congestion. In the Internet information display device, a television broadcast program and an Internet screen are displayed. At the same time, you may want to see something. Therefore, a television program and the Internet screen can be displayed simultaneously until a desired information source can be connected, or an Internet information display that can simultaneously display the television program and the Internet screen at any time, not only during the connection operation. The realization of the device has been desired.

In view of the circumstances described above, the applicant of the present invention has proposed in Japanese Patent Application No. 8-206222 a simple Internet information display device capable of simultaneously displaying a television program and an Internet screen. I have. The Internet information display device proposed by the present applicant will be described below.

The connection between the Internet information display device and the Internet is, for example, as shown in FIG. In this connection example, the remote control device 20a
Internet information display device remotely operated by
Connected to telephone line 2. The Internet information display device has a built-in modem. The telephone line 2 is connected to a modem 3 or a terminal adapter of a provider which is a connection service company, and the modem 3 is connected to a server 4 which is a computer of the provider.

[0008] The server 4 is always connected to the Internet 6 via a router 5 for setting a relay route. When the remote control device 20a is operated from the Internet information display device, a telephone call operation is automatically performed, and the Internet information display device connects to the Internet 6 via the server 4 of the provider (dial-up connection).

The configuration of the Internet information display device is as shown in the block diagram of FIG. 2 (the audio relationship is omitted). The television radio wave received by the antenna 10a is selected by the tuner 10, and the channel is selected. The video signal is detected by the video intermediate frequency / detection circuit 11 from the television wave thus obtained. The detected video signal is converted into a luminance signal Y and a color difference signal B-
Y and RY are extracted.

The extracted luminance signal Y and color difference signal B-
The video signal processor 13 converts Y, RY into red, green, and blue color signals R, G, and B, respectively. The color signals R, G, and B are supplied to an RGB matrix 15 via the switching unit 14 and output to the CRT 17 for each color. The video signal detected by the video intermediate frequency / detection circuit 11 is also supplied to a sync separation / deflection processing unit 16 to extract a vertical sync signal and a horizontal sync signal. The extracted vertical synchronizing signal and horizontal synchronizing signal are supplied to the CRT 17 and used as a screen scanning synchronizing signal.

The color signals R, G, B converted by the video signal processing unit 13 are supplied to a TV video horizontal compression unit 18 as video horizontal compression means via a switching unit 14. The TV video horizontal compression section 18 has a line memory for storing a video signal for each scanning line, and has a frequency of 4 fsc (fsc = frequency of the color subcarrier) which is a multiplication frequency of the horizontal synchronization signal supplied from the synchronization separation / deflection processing section 16. ) Is generated and the video signal is written. When reading a video signal, the frequency is 8 fsc, which is twice the frequency of the write clock.
The read clock is generated, read out by this, and given to the image left / right synthesizing unit 19 as image synthesizing means.

On the other hand, the Internet processing unit 22 connected to the communication line 24 converts red, green and blue color signals R, G, B of a video signal from data supplied via the communication line 24.
Are extracted, and these color signals R, G, and B are supplied to the RGB matrix 15 via the switching unit 23, and CR signals are output for each color.
Output to T17. When displaying only the screen of the Internet, the Internet processing unit 22 independently creates a vertical synchronization signal and a horizontal synchronization signal, and the vertical synchronization signal and the horizontal synchronization signal are supplied to the CRT 17 and used as screen synchronization signals. used.

When an instruction is received from the remote control device 20a, the Internet processing unit 22
A video signal which is a line memory to be described later
Write to IFO 29 (FIG. 11). In this case, the Internet processing unit 22 writes the video signal with a write clock having a frequency of 8 fsc, which is a multiple frequency of the horizontal synchronization signal provided from the TV video horizontal compression unit 18, reads the video signal with a read clock having a frequency of 8 fsc, and switches the switching unit. The video signal is supplied to the video left / right synthesizing unit 19 via the control unit. Each of the color signals R, G, B output by the Internet processing unit 22 is
This is provided to the video left / right synthesizing unit 19 via the switching unit 23. The video left / right synthesizing unit 19 synthesizes the video signals given from the TV video horizontal compression unit 18 and the Internet processing unit 22 in the horizontal direction, and the synthesized video signal is
The CRT 17 is provided to the RGB matrix 15 for each color.
Is output to

The tuning CPU 20 outputs a tuning instruction signal to the tuner 10 in accordance with an instruction from an optical signal, a radio signal, or the like from the remote control device 20a, transmits / receives a signal to / from the Internet processing unit 22, and outputs Internet information. Operate and control the display device. In addition, if necessary, an instruction signal is also output to the on-screen display control unit 21 so that the on-screen display control unit 2
The video signal is supplied to the RGB matrix 15 from 1.

FIG. 11 is a block diagram showing the configuration of the Internet processing unit 22. The Internet processing unit 22 is configured such that the modem 41 connected to the communication line 24
The CPU 38 is connected to the R via the bus 40
AM 37, ROM 39, clock generator 26, I / O port 3-34a, and gate array 36. The RAM 37 stores a video signal of data obtained via the modem 41 and the like, and the ROM 39 stores a processing program of the Internet processing unit 22, a video signal of a screen unique to the Internet information display device, and the like.

The synchronizing signal generator 25 includes a clock generator 2
A vertical synchronizing signal and a horizontal synchronizing signal unique to the Internet processing unit 22 are generated based on the clock output from the clock 6, and are provided to the gate array 36. The clock generator 26 outputs 8f
An SC clock is created and supplied to the gate array 36.
The I / O port 3-34a outputs a switching signal for switching between a mode for displaying an Internet screen on a full display screen and a mode for simultaneously displaying a television program and an Internet screen.

The gate array 36 is supplied with a video FIFO 29 as a line memory and a vertical synchronizing signal and a horizontal synchronizing signal from the TV video horizontal compression section 18 or the synchronizing signal creation section 25, and receives the TV video horizontal compression section 18 or a clock generator. 26, a write control unit 27 that performs write control of the video FIFO 29, and a vertical synchronization signal and a horizontal synchronization signal that are supplied from the TV video horizontal compression unit 18 or the synchronization signal generation unit 25. 18 or a read clock from clock generator 26,
Read control unit 2 for performing read control of video FIFO 29
8 is provided.

The gate array 36 is provided with a channel selection CPU 2.
An I / O port 1-31 for transmitting / receiving a signal to / from the
The signal from the O port 1-31 and the vertical synchronizing signal are
An interrupt control unit 30 for outputting as an interrupt signal at 38;
An I / O port 2 for exchanging signals with an EEPROM 33 for storing telephone numbers, IDs, passwords, communication histories, etc.
32.

The read control unit 28 determines whether the next field to be displayed is Odd or Even from the relationship between the applied vertical synchronizing signal and horizontal synchronizing signal.
The determination result is given to the CPU 38 by the interrupt control unit 30 at the interrupt timing of the vertical synchronization signal. Video F
Each color signal R, G, B read from the IFO 29 is finely colored by a color palette 35, respectively.
It is output to the switching unit 23.

The operation of the Internet information display device having such a configuration will be described below. When the mode for operating as a normal television is specified by the channel selection CPU 20, the Internet
a is received by the channel selection CPU 2
In response to an instruction from 0, a tuner 10 is selected. The selected television signal is transmitted to the video intermediate frequency / detection circuit 1
1, a video signal is detected, and a luminance signal Y and color difference signals BY and RY are extracted from the detected video signal by a video chroma processing unit 12.

The extracted luminance signal Y and color difference signal B-
The video signal processor 13 converts Y, RY into red, green, and blue color signals R, G, and B, respectively. The color signals R, G, and B are supplied to an RGB matrix 15 via the switching unit 14 and output to the CRT 17 for each color. From the video signal detected by the video intermediate frequency / detection circuit 11, a vertical synchronization signal and a horizontal synchronization signal are extracted by a sync separation / deflection processing unit 16. The extracted vertical synchronizing signal and horizontal synchronizing signal are supplied to the CRT 17, and are used as synchronizing signals when the respective color signals R, G, B are scanned on the screen.

[0022] The Internet information display device is a channel selection CP.
When the mode for operating as the Internet information display device is designated by U20, the CPU 38 is interrupted by the interrupt control unit 30. When the CPU 38 is interrupted, the CPU 38 reads the video signal for one screen of the initial screen from the ROM 39 and sets it in the RAM 37. Also,
The clock generator 26 outputs a clock and supplies the clock to the write control unit 27 and the read control unit 28. CPU3
8 outputs a switching signal from the I / O port 3-34a,
The output from the switching unit 14 is stopped, and the RGB matrix 1
5 is switched only from the switching unit 23 and the on-screen display control unit 21.

The interrupt control unit 30 activates the DMA controller built in the CPU 38 every time the horizontal synchronization signal is supplied from the read control unit 28,
37, the respective color signals R, G, B of the video signal for one scanning line are read out and supplied to the video FIFO 29. Video FIF
In O29, each of the color signals R, G, and B is written at the timing generated by the write control unit 27, and the read control unit 28 reads each of the color signals R, G, and B using a read clock of 4 fsc. Is supplied to the RGB matrix 15 via the section 23, and C
Output to RT17.

The synchronizing signal generator 25 supplies a vertical synchronizing signal and a horizontal synchronizing signal to the CRT 17 when displaying one screen, and these are used as synchronizing signals when the respective color signals R, G, B are scanned on the screen. . At this time, as shown in FIG. 12, the DMA controller starts the DM from one line before the display on the display screen of the CRT 17 starts (upper right in FIG. 12).
A, the color signals R, G, and B of the video signal are read from the RAM 37, and during the period of the invalid display area B that is not displayed on the display screen of the CRT 17 (horizontal retrace period), the video FIFO
During the period of the effective display area A displayed on the display screen of the CRT 17, the writing to the read control unit 28 is completed.
Performs reading from the video FIFO 29.

The read control unit 28 determines that the next field to be displayed is O at the interrupt timing of the vertical synchronization signal.
The result of the determination of dd or Even is given to the DMA controller of the CPU 38 via the interrupt control unit 30. The DMA controller sets the address in the RAM 37 of the video signal to be read according to the result.

As a result of the above operation, an initial screen as shown in FIG. 6 is displayed on the display screen of the CRT 17. The operator can change the picture (icon) of “Shop information”, “Travel / tourism”, “News”, “Learning”, “Amusement”, “Regional and corporate information”, “Original”, “Search”, and “Email” When the user operates the remote control device 20a from the inside and selects and decides, for example, a picture of “Travel / Sightseeing”, the Internet processing unit 22 executes
A “Travel / Sightseeing” selection screen as shown in FIG. 7 is displayed. Hereinafter, similarly, each time a selection is made and determined on the selection screen, a similar lower selection screen in which options are arranged in a tree shape is displayed.

The remote control device 20a is provided with a selection button (43) at the right end of the upper surface, a decision button (44) at the left end, and various types of buttons at the center, like a picture 42 displayed at the bottom of the initial screen (FIG. 6). An operation button (45) is provided. The selection button is
The position of the "pointing hand" pointer or cursor can be freely moved in eight directions, and a picture (including a button-shaped picture) or a character that overlaps the pointer or cursor when the enter button is operated Items displayed in columns are selected and determined.

When a selection is made on the selection screen and the search proceeds, a picture related to the searched item is stored in the ROM 39 and the E.
The data is read from the EPROM 33 and displayed on the display screen. The operator operates the remote control device 20a,
When a selection is made from this picture, the CPU 38
The telephone number of the server 4 of the provider is read out from the ROM 33, a telephone call operation is performed, and the server 4 of the provider and the Internet processing unit 22 are connected. When connected to the server 4 of the provider, a URL corresponding to the picture determined and determined is called and connected.

When the data of the connected URL home page is transmitted via the communication line 24 and the modem 41,
The CPU 38 converts this data into a video signal and
Set to 7. The video signal set in the RAM 37 is displayed on the display screen in the same manner as in the case of the initial screen. To call a URL that has not been registered, the user selects and determines “URL input” on the menu screen of the browser, which will be described later, and inputs the URL. During the calling operation of the telephone and the URL, "Data is being read" is displayed at the center of the basic diagram in which the menu screen of the browser as shown in FIG. 8 is displayed at the upper end.

Here, for example, when the initial screen (FIG. 6) is displayed and the mode for simultaneously displaying the normal television program and the Internet screen is designated by the channel selection CPU 20, the Internet information is displayed. In the display device, the CPU 38 is interrupted by the interrupt control unit 30. When the CPU 38 is interrupted, the I / O
A switching signal is output from the O port 3-34a, and the switching unit 14
And the output from the switching unit 23 are respectively switched to the TV video horizontal compression unit 18.

In the Internet information display device, the video signal processing unit 13 controls the red, green and blue color signals R, G and B.
Are supplied to the TV video horizontal compression unit 18 via the switching unit 14. The TV video horizontal compression section 18 creates a write clock of 4 fsc, which is a multiple frequency of the horizontal synchronization signal given from the synchronization separation / deflection processing section 16, and writes each color signal R, G, B of the video signal. When reading each of the color signals R, G, B of the video signal, a read clock having a frequency of 8 fsc, which is twice the write clock, is generated.
Is read from the start end of the scanning line, and supplied to the video left / right synthesizing unit 19.

On the other hand, the Internet processor 22 designates a mode for simultaneously displaying a normal television program and the Internet screen, and when the CPU 38 is interrupted, the video signal for one screen of the initial screen is read from the ROM 39. Is read out, set in the RAM 37, and the clock generator 26 is stopped. Then, the Internet processing unit 22 outputs a vertical synchronization signal from the TV video horizontal compression unit 18,
A horizontal synchronization signal and a clock of 8 fsc are provided.

The interrupt control unit 30 activates the DMA controller built in the CPU 38 every time the horizontal synchronization signal is supplied from the read control unit 28, and executes the RAM control by the DMA.
37, the respective color signals R, G, B of the video signal for one scanning line are read out and supplied to the video FIFO 29. Video FIF
In O29, each of the color signals R, G, and B is written at the timing generated by the write control unit 27, and the read control unit 28 reads the video signal from the timing of the middle point of the scanning line by the read clock of 8 fsc. The read-out color signals R, G, and B are read out by the switching unit 23.
Is provided to the video left / right synthesizing unit 19 via

The video left / right synthesizing unit 19 synthesizes the video signals supplied from the TV video horizontal compression unit 18 and the Internet processing unit 22 in the horizontal direction, and the synthesized video signal is supplied to the RGB matrix 15 and Every C
Output to RT17. Thus, as shown in FIG. 9, a normal television program is displayed on the left half of the display screen, and an Internet screen is displayed on the right half. This is possible not only for the initial screen of the Internet, but also for any screen of the Internet.

When the vertical control signal and the horizontal control signal are not supplied from the read control unit 28, the interrupt control unit 30 determines that the television program has been turned off, and notifies the CPU 38 of this by an interrupt. In response to this notification, the CPU 38 activates the clock generator 26 to supply the vertical synchronizing signal, the horizontal synchronizing signal, and the clock of 8 fsc to the write control unit 27 and the read control unit 28. Then, the Internet is displayed on the right half of the display screen. Display the screen of. Other operations of the Internet information display device when the two-screen display mode for simultaneously displaying a normal television program and the Internet screen are specified include the above-described normal television operation mode and full Internet screen. Since this is the same as in the case of the single screen display mode for displaying on the display screen, the description is omitted.

[0036]

In the Internet information display apparatus described above, the video F of the video signal is
By writing to the IFO 29, the display of the Internet screen is realized. However, in this method in which the DMA is repeated for each scanning line in the effective display area for each line, the DMA occupies the bus 40 for the period, so that the CPU 38 operates in the RAM 37, R
External access such as writing / reading to / from the OM 39 and communication with the modem 41 is not possible.

Here, the time during which the bus 40 is occupied by the DMA per screen is expressed by equation (1). H (pixel) × V (line) × T (time) × P (bit) / D (bit) (1) where H; horizontal image display size V; vertical image display size T; time required per DMA cycle P ; Depth per pixel D; Data size of DMA

For example, the data size of the DMA is 32 bits, and the time required for one cycle of the DMA is 100 bits.
ns, 640 horizontal pixels and 4 vertical pixels
If an attempt is made to display an Internet screen with 80 lines and a depth of 8 bits per pixel, the time for which the bus 40 is occupied by DMA per screen is approximately 8 ms according to the equation (1). Since the frame period of the NTSC system is about 33 ms, (8 (ms) / 33 (m
s)) × 100 ≒ 24 (%), the CPU 38 cannot access the outside.

For this reason, in the example described above, the CPU 38
640 × 100 (n) every line, that is, every 63.5 μs
s) × 8 (bits) / 32 (bits) = 16 (μs) for a continuous period of time because communication cannot be performed due to DMA.
The communication function between U38 and modem 41 or terminal adapter is reduced. In the Internet, the communication procedure is TC
P / IP, which has a high data compression rate. Therefore, communication overrun errors frequently occur due to connection with a high-speed modem and a high-speed ISDN line.

Therefore, several proposals for solving this problem have been made. One is a method in which the video FIFO 29 is owned by one frame instead of one line as in the present proposal. As an example of this, "Interfac
e ", March 1997, p71-p81. In this system, since it is not necessary to perform DMA for each line according to the display as in the present proposal,
DMA in the cycle steal mode can be performed. Therefore, the CPU 38 can continue other processing even during the DMA transfer, and can reduce the communication overrun error described above.

Another method is to mount a graphic engine on the system. The graphic engine is
A CPU bus interface and a RAM interface are separately provided, and a frame memory (RAM) is
It can be provided independently of the bus. Therefore, similarly to the case where the video FIFO for one frame is provided, it is not necessary to perform DMA for each line in synchronization with the screen display timing, and it is possible to perform DMA in the cycle steal mode. Furthermore, this method has an advantage that the drawing speed can be greatly improved because much of the drawing processing can be performed by a graphic engine which is hardware, even in comparison with the above-described method.

Recently, an SVGA size of 800 pixels horizontally × 600 lines vertically is often used as a display format of a personal computer. Therefore, the designer of the homepage may insert an image and a table on the assumption that the horizontal resolution is 800. When browsing this home page in a display format with a horizontal resolution of 640, it is necessary to frequently scroll in the horizontal direction. This problem is the same in the Internet information display device, and an Internet information display device that does not need to be scrolled in the horizontal direction is desired.

To eliminate the need for horizontal scrolling,
It is necessary to set the frequency of the video display clock high. In the NTSC television, the effective display area of one horizontal period is one horizontal period excluding the horizontal blanking period and the television overscan period, and is about 47.4 μs. Therefore, in order to display 800 pixels or more horizontally in this period, 800 / 47.4 is required.
(Μs) ≒ 16.9 MHz or higher display clock is required. Further, in order to realize the simultaneous display function of a television program and an Internet screen with a simple configuration described as a conventional technique, a display clock having a frequency twice as high as that of displaying only the Internet screen is required. is there. That is, 16.9 (MHz) × 2 = 33.8 (MH
z) More display clocks are required.

If the Internet information display device is to be provided with a video output terminal capable of recording a display screen on a VTR and a video printer, the RGB display data is modulated into a decoded video signal at a stage subsequent to the color palette 35 (FIG. 11). There is a need. At this time, an interleaving relationship needs to be established between the RGB display data and the color subcarrier. For this reason, the frequency of the display clock needs to be an integral multiple of the frequency (= fsc) of the color subcarrier. In other words, if the display clock is selected under the condition that an image having a horizontal resolution of 800 or more is displayed on one screen in the horizontal direction, the color subcarrier frequency which is 10 times the color subcarrier frequency is 3
5.79545 MHz is most desirable.

However, the graphic engine is NTS
In the case of performing the display in the C system, it is not possible to cope with such a high-frequency display clock due to the performance of the IC. Therefore, the simultaneous display function of a television program and an Internet screen with a simple configuration, which has been described as a conventional technique, cannot be realized using a graphic engine. The present invention has been made in view of the above circumstances, and provides an Internet information display device that can simultaneously display a television program and an Internet screen with a simple configuration using a graphic engine capable of high-speed drawing. The purpose is to provide.

[0046]

An Internet information display apparatus according to a first aspect of the present invention displays a video signal in a video signal on a screen, fetches data from the Internet through a telephone line, and converts the data into a video signal. An Internet information display device for displaying on a screen by converting the data into a video signal, the graphics engine having at least one frame memory, and compressing the video signal extracted from the video signal in a horizontal direction of the screen. Horizontal compression means for compressing the video signal, the data horizontal compression means for compressing the video signal converted by the graphic engine in the horizontal direction of the screen, the video horizontal compression means and the video signal compressed by the data horizontal compression means, respectively. Video synthesizing means for horizontally synthesizing the video signal, a video signal in the video signal, and the data And a switching means for al converted video signal and the image combining unit switches to either of the synthesized picture signal, a video signal said switching means is switched, characterized in that none to be displayed on the screen.

In this Internet information display device, the video horizontal compression means compresses the video signal in the video signal in the horizontal direction of the screen, and the graphic engine converts the data fetched from the Internet into a video signal using a memory. The data horizontal compression means compresses the video signal converted from the data in the horizontal direction of the screen. Then, the video synthesizing unit synthesizes the video signals compressed by the video horizontal compression unit and the data horizontal compression unit, side by side. The switching means is a video signal in the video signal,
The video signal is switched to one of the video signal converted from the data and the video signal synthesized by the video synthesis means, and the switched video signal is displayed on the screen.

As a result, the graphic engine can make the memory independent of the CPU bus, and does not need to perform DMA for each line in synchronization with the screen display timing, and can perform DMA in the cycle steal mode. Therefore, it is possible to realize an Internet information display device having a simple configuration capable of simultaneously displaying a television program and an Internet screen at a high speed.

In the Internet information display apparatus according to a second aspect of the present invention, the video horizontal compression means and the data horizontal compression means each have a line memory for storing a video signal for each scanning line, and The means includes line memory write control means for controlling writing to the line memory and line memory read control means for controlling reading from the line memory, wherein the line memory write control means extracts from the video signal. The writing is performed to the line memory by a timing based on the horizontal synchronizing signal and the vertical synchronizing signal, and by a write clock that matches a clock frequency read by the graphic engine.

In this Internet information display device, the video horizontal compression means and the data horizontal compression means are:
Each has a line memory for storing a video signal for each scanning line. In the data horizontal compression means, the line memory write control means controls writing to the line memory, and the line memory read control means controls reading from the line memory. Then, the line memory writing control means includes:
The video signal written by the graphic engine to the memory at high speed is written to the line memory by the timing based on the horizontal synchronization signal and the vertical synchronization signal extracted from the video signal, and by the write clock that matches the clock frequency read by the graphic engine. Control.

As a result, the data horizontal compression means
A video signal obtained by compressing the video output from the graphic engine to に よ り by a line memory and a video signal obtained by compressing the video signal extracted from the video signal by ラ イ ン by a line memory are arranged side by side. They can be combined and displayed on a television screen.

According to a third aspect of the present invention, in the Internet information display device, the line memory has a capacity to display an SVGA image in one screen in a horizontal direction, and the line memory read control means is at least twice the write clock. It is characterized by controlling to read from the line memory based on a read clock having a frequency.

In this Internet information display device, the line memory has a capacity to display an SVGA image on one screen in the horizontal direction. The line memory read control means controls to read from the line memory based on a read clock having at least twice the frequency of the write clock. Thus, the SVGA image can be displayed on one screen in the horizontal direction by the NTSC system.

According to a fourth aspect of the present invention, in the Internet information display device, the line memory read control means and the line memory write control means write a video signal in the frame to the line memory from the line memory in the frame. A control is performed to start from a phase immediately before the start of reading, which is one line before the reading start line, so as to prevent overtaking between writing to the line memory and reading from the line memory. I do.

In this Internet information display device, the line memory read control means and the line memory write control means write the video signal in the frame to the line memory one line before the read start line from the line memory in the frame. Is controlled to start from the phase corresponding to immediately after the start of reading. Then, overtaking between writing to the line memory and reading from the line memory is prevented. As a result, the read control to the graphic engine, the write control to the line memory, and the write control from the line memory can be controlled by the horizontal synchronizing signal, the vertical synchronizing signal, Internet information display device having a simple configuration capable of simultaneously displaying a television program and an Internet screen because a complicated circuit for synchronizing two video signals is not required. Can be realized.

According to a fifth aspect of the present invention, in the Internet information display device, the line memory read control means includes a phase adjustment means for adjusting a read start phase from the line memory, and the line memory write control means includes a phase adjustment means. A phase changing means for changing a writing start phase to the line memory in accordance with the reading start phase adjusted by the means is provided.

In this Internet information display device, the line memory read control means adjusts the phase from which the phase adjustment means starts reading from the line memory. Then, the line memory writing control means changes the write start phase to the line memory in accordance with the read start phase adjusted by the phase adjustment means. As a result, even if the screen display position is adjusted, interference such as overtaking does not occur.
An Internet information display device with a simple configuration capable of simultaneously displaying a television program and an Internet screen can be realized.

[0058]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing an embodiment. FIG. 1 is an explanatory diagram for explaining an example of connection between the Internet information display device according to the present invention and the Internet. In this connection example, an Internet information display device 1 remotely operated by a remote control device 20a is connected to a telephone line 2. The Internet information display device 1 has a built-in modem. The telephone line 2 is connected to a modem 3 or a terminal adapter of a provider which is a connection service company, and the modem 3 is connected to a server 4 which is a computer of the provider.

The server 4 is always connected to the Internet 6 and is connected to the Internet 6 via a router 5 for setting a relay route. When the remote control device 20a is operated from the Internet information display device 1, a telephone call operation is automatically performed, and the Internet 6 is transmitted via the server 4 of the provider.
Connect to (dial-up connection).

FIG. 2 is a block diagram showing the configuration of the main part of an embodiment of the Internet information display apparatus according to the present invention (sound-related elements are omitted). In the Internet information display device 1, a television signal received by an antenna 10 a is selected by a tuner 10, and a video signal of the selected television signal is detected by a video intermediate frequency / detection circuit 11. The detected video signal is converted by the video chroma processing unit 12 into a luminance signal Y and color difference signals BY, R.
-Y is extracted.

The extracted luminance signal Y and color difference signal B−
The video signal processor 13 converts Y, RY into red, green, and blue color signals R, G, and B, respectively. The color signals R, G, and B are supplied to an RGB matrix 15 via the switching unit 14 and output to the CRT 17 for each color. The video signal detected by the video intermediate frequency / detection circuit 11 is also supplied to a sync separation / deflection processing unit 16 to extract a vertical sync signal and a horizontal sync signal. The extracted vertical synchronizing signal and horizontal synchronizing signal are supplied to the CRT 17 and used as a screen scanning synchronizing signal.

Each of the color signals R, G, B converted by the video signal processing unit 13 is supplied to a TV video horizontal compression unit 18 as video horizontal compression means via a switching unit 14. The TV video horizontal compression section 18 has a line memory for storing a video signal for each scanning line, and has a frequency of 4 fsc (fsc = frequency of the color subcarrier) which is a multiplication frequency of the horizontal synchronization signal supplied from the synchronization separation / deflection processing section 16. ) Is generated and the video signal is written. When reading a video signal, the frequency is 8 fsc, which is twice the frequency of the write clock.
The read clock is generated, read out by this, and given to the image left / right synthesizing unit 19 as image synthesizing means.

On the other hand, the Internet processing section 22a connected to the communication line 24 converts the data supplied via the communication line 24 into red, green and blue color signals R, G,
B, and these color signals R, G, B are given to the RGB matrix 15 via the switching unit 23,
Output to RT17. Internet processing unit 22a
Creates only a vertical synchronizing signal and a horizontal synchronizing signal when displaying only the screen of the Internet, and the vertical synchronizing signal and the horizontal synchronizing signal are given to the CRT 17 and used as a synchronizing signal for screen scanning.

When there is an instruction from the remote control device 20a, the Internet processing unit 22a writes a video signal into a video FIFO 52 (FIG. 3) as a line memory by a graphic engine 49 (FIG. 3) described later. In this case, the Internet processing unit 22a
A video signal is written using a 分 frequency clock of a frequency of 8 fsc which is a multiple frequency of the horizontal synchronizing signal provided from the video horizontal compression unit 18 as a write clock, and is read by a read clock based on a separately generated clock of a frequency of 10 fsc. Left and right synthesizing unit 19 via the switching unit 23
Give to.

Each of the color signals R, G, B output from the Internet processing section 22 a is also supplied to the video left / right synthesizing section 19 via the switching section 23. The video left / right synthesizing unit 19 horizontally synthesizes the video signals supplied from the TV video horizontal compression unit 18 and the Internet processing unit 22a, and the synthesized video signal is supplied to the RGB matrix 15, and the CRT 17 is provided for each color. Is output to

The tuning CPU 20 outputs a tuning instruction signal to the tuner 10 in accordance with an instruction from an optical signal, a radio signal, or the like from the remote control device 20a, transmits and receives signals to and from the Internet processing unit 22a, and outputs Internet information. The operation of the display device 1 is controlled. Further, if necessary, an instruction signal is also output to the on-screen display control unit 21 so that the video signal is supplied from the on-screen display control unit 21 to the RGB matrix 15.

FIG. 3 is a block diagram showing a configuration example of the Internet processing unit 22a. The Internet processing unit 22a is configured such that the modem 41 connected to the communication line 24
The CPU 38 is connected via a bus 40 to a RAM 37, a ROM 39, a clock generator 26,
/ O port 3-34a, graphic engine 49, and gate array 36a. RAM 37 is
The ROM 39 stores a processing program of the Internet processing unit 22a, a video signal of a screen unique to the Internet information display device 1, and the like.

The clock output from the clock generator 26 is supplied to the synchronizing signal generator 25,
Is the Internet processing unit 2 based on the given clock.
2a, a unique vertical synchronizing signal and a horizontal synchronizing signal are created and supplied to the gate array 36a. The clock generator 26
A clock of fsc is created and supplied to the gate array 36a.

The horizontal synchronizing signal generated by the synchronizing signal generator 25 is supplied to a PLL 55 (phase locked loop) together with the horizontal synchronizing signal from the TV video horizontal compressor 18.
The PLL 55 creates a line lock (read clock) of 10 fsc based on any given horizontal synchronizing signal, and gives it to the gate array 36a. I / O port 3-
34a outputs a switching signal for switching between a mode for displaying the Internet screen on the full display screen and a mode for simultaneously displaying the television program and the Internet screen.

The graphic engine 49 has an interface with the bus 40 and an interface with the RAM 37 separately, and has a RAM 50 as a frame memory independently of the bus 40. The drawing on the RAM 50 is performed by the DMA transfer from the RAM 37 in the cycle steal mode.
U can continue with other processing.

The gate array 36a is supplied with a vertical synchronizing signal and a horizontal synchronizing signal from the TV video horizontal compression section 18 or the synchronizing signal creating section 25, and receives a line lock (read clock) from the TV video horizontal compression section 18 or the clock generator 26.
And a graphic engine read control unit 51 for controlling reading of a video signal from the graphic engine 49, and a video FIFO 52 as a line memory.

The gate array 36a is also supplied with a vertical synchronizing signal and a horizontal synchronizing signal from the TV video horizontal compression section 18 or the synchronizing signal creation section 25, and the TV video horizontal compression section 18
Alternatively, a line lock (write clock) is given from a clock generator 26, and a video FIFO write control unit 53 that performs write control of a video FIFO 52, and a vertical synchronization signal and a horizontal signal from a TV video horizontal compression unit 18 or a synchronization signal creation unit 25. A synchronizing signal is given, a line lock (read clock) is given from the PLL 55, and a video FIFO
Video FIFO read control unit 5 for performing read control of 52
And 4.

The gate array 36a is provided with a channel selection CPU.
I / O port 1-31 for transmitting and receiving signals to and from
The signal from the / O port 1-31 and the vertical synchronizing signal
Interrupt control unit 30 that outputs as an U38 interrupt signal
And an EEPROM 33 for storing a telephone number, an ID, a password, a communication history, and the like, and an I / O port 2-32 for transmitting and receiving signals.

The video FIFO read control unit 54 determines whether the next field to be displayed is Odd or Even from the relationship between the applied vertical synchronizing signal and horizontal synchronizing signal. The signal is given to the CPU 38 by the interrupt control unit 30 at the signal interrupt timing. The video FIFO read control unit 54 also sends a read start timing signal 56 for notifying the start of reading of each line from the video FIFO 52 to the graphic engine read control unit 51 and the video FIFO write control unit 5.
Give to 3. Each of the color signals R, G, and B read from the video FIFO 52 is finely colored by the color palette 35 and output to the switching unit 23.

The operation of the Internet information display device 1 having such a configuration will be described below. When the mode of operating as a normal television is specified by the channel selection CPU 20, the Internet information display device 1 transmits the television signal received by the antenna 10 a to the channel selection CP.
In response to an instruction from U20, a tuner 10 is selected.
From the selected television wave, a video signal is detected by a video intermediate frequency / detection circuit 11, and from the detected video signal, a luminance signal Y is detected by a video chroma processing unit 12.
And the color difference signals BY and RY are extracted.

The extracted luminance signal Y and color difference signal B−
The video signal processor 13 converts Y, RY into red, green, and blue color signals R, G, and B, respectively. The color signals R, G, and B are supplied to an RGB matrix 15 via the switching unit 14 and output to the CRT 17 for each color. From the video signal detected by the video intermediate frequency / detection circuit 11, a vertical synchronization signal and a horizontal synchronization signal are extracted by a sync separation / deflection processing unit 16. The extracted vertical synchronizing signal and horizontal synchronizing signal are supplied to the CRT 17, and are used as synchronizing signals when the respective color signals R, G, B are scanned on the screen.

The Internet information display device 1 selects the channel C
When a mode for operating as an Internet information display device is designated by the PU 20, the CPU 38 is interrupted by the interrupt control unit 30. When the CPU 38 is interrupted, the CPU 38 reads the video signal for one screen of the initial screen from the ROM 39 and sets it in the RAM 37. Further, the CPU 38 outputs a switching signal from the I / O port 3-34a, stops the output from the switching unit 14, and outputs RGB signals.
The input to the matrix 15 is switched only from the switching unit 23 and the on-screen display control unit 21. The graphic engine 49 draws a video signal from the RAM 37 to the RAM 50 (frame memory) by DMA transfer in the cycle steal mode. During this DMA transfer, the CPU can continue other processing.

If the Internet information display device 1 is in a mode in which it operates as an Internet information display device, and a single-screen display mode for displaying only an Internet screen is specified, the graphic engine read control unit 51 performs synchronization. Using the vertical synchronizing signal and the horizontal synchronizing signal supplied from the signal generator 25 as a reference, the 1/2 fs clock of 8 fsc supplied from the clock generator 26 is used as a read clock, and one scanning line is read from the RAM 50 via the graphic engine 49. Are read out for each of the color signals R, G, B of the video signal.

In the mode in which the Internet information display device 1 operates as an Internet information display device, and when the two-screen display mode for simultaneously displaying a normal television program and the Internet screen is designated, the graphic engine The read control unit 51 uses the vertical synchronizing signal and the horizontal synchronizing signal supplied from the TV video horizontal compression unit 18 as a reference, and uses the 8 fsc 1/2 frequency-divided clock supplied from the TV video horizontal compression unit 18 as a read clock, as a graphic engine. RAM 50 via 49
, The respective color signals R, G, B of the video signal for one scanning line are read out.

In both the one-screen display mode and the two-screen display mode, the ｆ frequency-divided clock of 8 fsc is used as the read clock, as described above, when the graphic engine 49 performs the read by the NTSC system.
This is because it is not possible to cope with a high-frequency read clock due to the performance of the IC. Graphic engine read control unit 51
Supplies the video signal read from the graphic engine 49 to the video FIFO 52.

The video FIFO 52 is a conventional video FIFO.
The capacity is larger than that of the FO29 (FIG. 11). In a conventional Internet information display device, the horizontal resolution is 6
While about 40 is sufficient, the Internet information display device 1 according to the present invention has a horizontal resolution of 800.
The above SVGA image is displayed on one screen in the horizontal direction. Therefore, the capacity of the video FIFO 52 needs to be 800 bytes or more, for example, when the depth per pixel is 8 bits.

The writing to the video FIFO 52 is performed in the video FIFO writing control unit 53 in the one-screen display mode.
Are based on the vertical synchronizing signal and the horizontal synchronizing signal supplied from the synchronizing signal generator 25, and use the 1/2 fs clock of 8 fsc supplied from the clock generator 26 as a write clock to write each color of the video signal for one scanning line. Signals R, G, B
Perform each time. On the other hand, in the two-screen display mode, the video FI
The writing to the FO 52 is performed by the video FIFO writing control unit 5
Reference numeral 3 designates a vertical synchronizing signal and a horizontal synchronizing signal supplied from the TV video horizontal compressing section 18 as a reference, and a 1/2 frequency clock of 8 fsc which is a frequency multiplied by the horizontal synchronizing signal is used as a writing clock, and one scanning line is used. This is performed for each color signal R, G, B of the video signal.

Reading from the video FIFO 52 is performed by a reading clock based on a clock having a frequency of 10 fsc, which is a multiple frequency of the horizontal synchronizing signal. The clock having a frequency of 10 fsc is generated by the PLL 55 based on the horizontal synchronization signal supplied from the synchronization signal generation unit 25 in the one-screen display mode, and supplied from the TV video horizontal compression unit 18 in the two-screen display mode. It is created by the PLL 55 based on the horizontal synchronization signal.

Reading from the video FIFO 52 is performed in the video FIFO reading control unit 54 in the one-screen display mode.
Is based on the vertical synchronization signal and the horizontal synchronization signal supplied from the synchronization signal generation unit 25, and uses the ｆ frequency-divided clock of 10 fsc supplied from the PLL 55 as a read clock to read out each color signal R, This is performed for each of G and B.

On the other hand, in the two-screen display mode, the video F
Reading from the IFO 52 is performed by the video FIFO reading control unit 54 for one scanning line using the 10 fsc clock supplied from the PLL 55 as a read clock with reference to the vertical synchronization signal and the horizontal synchronization signal supplied from the TV video horizontal compression unit 18. Is performed for each of the color signals R, G, and B of the video signal. Each color signal R, read from the video FIFO 52,
G and B are finely colored by a color palette 35, respectively, and the RGB matrix 1
5 and output to the CRT 17 for each color.

The synchronizing signal generator 25 supplies a vertical synchronizing signal and a horizontal synchronizing signal to the CRT 17 when displaying one screen, and these are used as synchronizing signals when the respective color signals R, G, B are scanned on the screen. . Also, the video FIFO read control unit 54 sets the interrupt timing of the vertical synchronizing signal
The determination result as to whether the next field to be displayed is Odd or Even is sent to the CPU via the interrupt control unit 30.
38 DMA controllers. According to the result, the DMA controller reads the video signal from the RAM 37
Set the address in.

As described above, the graphic engine read control unit 51, the video FIFO write control unit 53, the video FIFO read control unit 54, and the PLL 55 are supplied from the clock generator 26 which oscillates in a free-run mode in the one-screen display mode. The operation is performed based on the received clock and the vertical synchronization signal and the horizontal synchronization signal supplied from the synchronization signal generation unit 25 based on the clock. On the other hand, in the two-screen display mode, the TV video horizontal compression section 18 operates based on the vertical synchronization signal and the horizontal synchronization signal extracted from the TV video signal, and a clock which is a multiple frequency of the horizontal synchronization signal.

FIG. 4 shows a graphic engine read control unit 51, a video FIFO write control unit 53, and a video F
5 is a timing chart showing each horizontal control timing of the IFO read control unit 54. In single screen display mode,
Reading by graphic engine read control unit 51 (b)
The writing (c) of the video FIFO writing control unit 53 starts from the phase immediately after the reading (d) of the video FIFO reading control unit 54 starts. The video FIFO read control unit 54 reads the line (c) written by the video FIFO write control unit 53 in the horizontal synchronization signal (a) one cycle before (d), and reads the line (d).
The write control unit 53 sequentially writes the video signal of the next line (c).

Also in the two-screen display mode, the reading (f) of the graphic engine reading control unit 51 and the video FI
The writing (g) of the FO writing control unit 53 is a video FI
The phase starts immediately after the reading (h) of the FO reading control unit 54 starts, but the reading (h) of the video FIFO reading control unit 54 starts at the left half of the screen in the horizontally compressed TV.
Delay by the time to insert the video. Also in this case, the video FIFO read control unit 54 reads the line (g) written by the video FIFO write control unit 53 in the horizontal synchronization signal (e) one cycle earlier (e) (h), and the video is read immediately after the read. The FIFO write control unit 53 sequentially writes the video signal of the next line (g).

FIG. 5 shows a graphic engine read control unit 51, a video FIFO write control unit 53, and a video F
FIG. 3 is an explanatory diagram for explaining each vertical control timing of an IFO read control unit 54. Read of graphic engine read control unit 51 and video FIFO write control unit 53
(A) is performed in the order of the first field of the scanning line 1 to the scanning line 240 and the second field of the scanning line 241 to the scanning line 480. Video FIFO read control unit 54
Reading (b) and displaying on the screen (c) are performed by the video FI
From the writing (a) of the FO writing control unit 53, the scanning line 1
The first field of the scanning line 240 from the scanning line 240 and the second field of the scanning line 480 from the scanning line 241 are performed in order of the delay, and the screen includes the scanning line 1 and the scanning line 2 from the top.
41, the scanning line 2, and the scanning line 242 # are displayed in order (c).

The above-mentioned control timing is used to prevent the overtaking between the writing and reading of the video FIFO 52 from occurring. The reading (b) (f) of the graphic engine reading control unit 51 and the writing (c) (g) of the video FIFO writing control unit 53 are
Regardless of the screen display mode, a frequency of 8 fsc / 2 that can be displayed by the graphic engine 49 by the NTSC system is used as a clock. On the other hand, the video FIFO read control unit 5
4 is 10 fsc / in the one-screen display mode.
A clock having a frequency of 2 is used as a read clock, and a clock having a frequency of 10 fsc is used as a read clock in the two-screen display mode.

Therefore, regardless of the screen display mode, reading from the graphic engine 49 and the video FIFO 5
2 is longer than the time required to read from the video FIFO 52. Therefore, by starting reading from the graphic engine 49 and writing to the video FIFO 52 from the phase immediately after the start of reading, which is one line before the timing of reading from the video FIFO 52, the writing between the writing and reading of the video FIFO 52 is started. Overtaking does not occur.

The horizontal position actually displayed on the CRT 17 differs depending on the individual deflection characteristics of the CRT 17.
In order to absorb this difference, video FI
The read timing from the FO 52 needs to be adjustable, but in the Internet information display device 1 according to the present invention, the read timing from the graphic engine 49 and the write timing to the video FIFO 52 are the same as the read timing from the video FIFO 52. In order to start from immediately before, it is necessary to change the phase of the read timing from the graphic engine 49 and the write timing to the video FIFO 52 in accordance with the adjustment of the read timing from the video FIFO 52. Therefore, in FIG.
The video FIFO read control unit 54 controls the video FIFO 5
A read start timing signal 56 for notifying the start of readout of each line from the control unit 2 is supplied to the graphic engine read control unit 51 and the video FIFO write control unit 53.

As a result of the above-described operation, in the one-screen display mode, an initial screen as shown in FIG. 6 is displayed on the display screen of the CRT 17. The operator can use this initial screen to display "Store information", "Travel and sightseeing", "News", "Learning" and "Amusement".
By operating the remote control device 20a from among the pictures (icons) of "area and company information", "original", "search", and "e-mail", for example, selecting and determining a picture of "travel / sightseeing" The Internet processing unit 22a
As in the case of the initial screen, a selection screen of “travel / sightseeing” as shown in FIG. 7 is displayed. Hereinafter, similarly, each time a selection is made and determined on the selection screen, a similar lower selection screen in which options are arranged in a tree shape is displayed.

The remote control device 20a is provided with a selection button (43) at the right end of the upper surface, a decision button (44) at the left end, and various types of buttons at the center, as shown in a picture 42 displayed at the bottom of the initial screen (FIG. 6). An operation button (45) is provided. The selection button is
The position of the "pointing hand" pointer or cursor can be freely moved in eight directions, and a picture (including a button-shaped picture) or a character that overlaps the pointer or cursor when the enter button is operated Items displayed in columns are selected and determined.

When the selection is determined on the selection screen and the search proceeds, the picture related to the searched item is stored in the ROM 39 and the E.
The data is read from the EPROM 33 and displayed on the display screen. The operator operates the remote control device 20a,
When a selection is made from this picture, the CPU 38
The telephone number of the server 4 of the provider is read from the ROM 33, and a telephone call operation is performed, so that the server 4 of the provider and the Internet processing unit 22a are connected. When connected to the server 4 of the provider, a URL corresponding to the picture determined and determined is called and connected.

When the data of the connected URL home page is transmitted via the communication line 24 and the modem 41,
The CPU 38 converts this data into a video signal and
Set to 7. The video signal set in the RAM 37 is displayed on the display screen in the same manner as in the case of the initial screen. To call a URL that has not been registered, the user selects and determines “URL input” on the menu screen of the browser, which will be described later, and inputs the URL. During the calling operation of the telephone and the URL, "Data is being read" is displayed at the center of the basic diagram in which the menu screen of the browser as shown in FIG. 8 is displayed at the upper end.

Here, for example, when the initial screen (FIG. 6) is displayed and the channel selection CPU 20 designates a two-screen display mode for simultaneously displaying a normal television program and an Internet screen. In the Internet information display device 1, the CPU 38 can be interrupted by the interrupt control unit 30. When interrupted, the CPU 38 outputs a switching signal from the I / O port 3-34a, and switches the output from the switching unit 14 and the output from the switching unit 23 to the TV video horizontal compression unit 18, respectively.

The Internet information display device 1 uses the video signal processing unit 13 to output red, green and blue color signals R, G,
The color signals R, G, and B converted to B are supplied to the TV video horizontal compression unit 18 via the switching unit 14. The TV video horizontal compression section 18 creates a write clock of 4 fsc, which is a frequency multiplied by the horizontal synchronization signal supplied from the synchronization separation / deflection processing section 16, and thereby generates the respective color signals R, G, B of the video signal.
Write each. When reading each of the color signals R, G, B of the video signal, a read clock having a frequency of 8 fsc, which is twice the write clock, is generated.
B is read from the start end of the scanning line, and is supplied to the video left / right synthesizing unit 19.

On the other hand, the Internet processing unit 22a is set to a two-screen display mode in which a normal television program and an Internet screen are displayed at the same time.
Is interrupted, the video signal for one screen of the initial screen is read from the ROM 39 and set in the RAM 37,
Further, the clock generator 26 is stopped. Then, the Internet processing unit 22a is supplied with a vertical synchronization signal, a horizontal synchronization signal, and a clock of 8 fsc from the TV video horizontal compression unit 18. In the video FIFO 52, the video signal is read from the timing of the intermediate point of the scanning line by the above-described operation, and the read color signals R, G, and B are supplied to the video left / right combining unit 19 via the switching unit 23.

The video left / right synthesizing unit 19 synthesizes the video signals supplied from the TV video horizontal compression unit 18 and the Internet processing unit 22a in the horizontal direction, and the synthesized video signal is supplied to the RGB matrix 15, and It is output to the CRT 17 every time. Thus, as shown in FIG. 9, a normal television program is displayed on the left half of the display screen, and an Internet screen is displayed on the right half. This is possible not only for the initial screen of the Internet, but also for any screen of the Internet.

When the vertical synchronizing signal and the horizontal synchronizing signal are not supplied from the video FIFO read control unit 54, the interrupt control unit 30 determines that the television program has been turned off, and notifies the CPU 38 of this by an interrupt. C
In response to this notification, the PU 38 operates the clock generator 26 to supply the vertical synchronizing signal, the horizontal synchronizing signal, and the clock of 8 fsc to the video FIFO writing control unit 53 and the video FIFO reading control unit 54. Display the Internet screen in the right half. The other operations of the Internet information display device 1 are the same as those in the above-described mode of operating as a normal television and in the mode of displaying the Internet screen on the full display screen, and a description thereof will be omitted.

[0103]

According to the Internet information display device of the first aspect, the graphic engine stores the memory in the CP.
It can be made independent of the U bus, and it is not necessary to perform DMA for each line in accordance with the timing of screen display, and it is possible to perform DMA in cycle steal mode. At the same time, it is possible to realize an Internet information display device having a simple configuration capable of displaying at high speed.

According to the Internet information display device of the second invention, the data horizontal direction compression means compresses the video output from the graphic engine into half by the line memory and the video horizontal direction compression means. The video signal extracted from the video signal is divided into 1 /
2 can be combined side by side with the video signal compressed to 2 and displayed on a television screen.

According to the Internet information display device of the third aspect, an SVGA image can be displayed in one screen in the horizontal direction by the NTSC system.

According to the Internet information display device of the fourth aspect, the interference such as overtaking does not occur.
The read control to the graphic engine, the write control to the line memory, and the write control from the line memory can be synchronized with the horizontal synchronization signal, the vertical synchronization signal, and the line-locked clock on the television screen side. Since a complicated circuit for synchronizing video signals is not required, an Internet information display device having a simple configuration capable of simultaneously displaying a television program and an Internet screen can be realized.

According to the Internet information display apparatus of the fifth invention, even if the screen display position is adjusted, no obstacle such as overtaking occurs, and the Internet information display apparatus has a simple configuration capable of simultaneously displaying a television program and an Internet screen. An information display device can be realized.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating an example of connection between an Internet information display device according to the present invention and the Internet.

FIG. 2 is a block diagram showing a main configuration of an embodiment of the Internet information display device according to the present invention.

FIG. 3 is a block diagram illustrating a configuration example of an Internet processing unit of the Internet information display device according to the present invention.

FIG. 4 is a graphic engine read control unit, video F
6 is a timing chart showing control timings of an IFO write control unit and a video FIFO read control unit.

FIG. 5 is a graphic engine read control unit, video F.
FIG. 4 is an explanatory diagram for describing control timings of an IFO write control unit and a video FIFO read control unit.

FIG. 6 is an explanatory diagram for describing an initial screen of the Internet information display device.

FIG. 7 is an explanatory diagram illustrating a selection screen of “travel / sightseeing”.

FIG. 8 is an explanatory diagram for explaining a menu screen of a browser.

FIG. 9 is an explanatory diagram for explaining a state in which a normal television program is displayed in the left half of the display screen and an Internet screen is displayed in the right half.

FIG. 10 is an explanatory diagram for describing a connection example between a computer and the Internet.

FIG. 11 is a block diagram illustrating a configuration example of a conventional Internet processing unit.

FIG. 12 is an explanatory diagram for explaining an operation in which a DMA controller transfers a video signal.

[Explanation of symbols]

Reference Signs List 1 Internet information display device 14, 23 Switching unit (switching unit) 15 RGB matrix 17 CRT 18 TV video horizontal compression unit (video horizontal compression unit) 19 Video left / right combining unit (video combining unit) 20 Tuning CPU 20a Remote control device 22a Internet processing unit (data horizontal compression means) 24 communication line (telephone line) 25 synchronization signal creation unit 26 clock generator 30 interrupt control unit 36a gate array 37, 50 RAM 38 CPU 41 modem 49 graphic engine 51 graphic engine read control Unit 52 video FIFO 53 video FIFO write control unit 54 video FIFO read control unit 55 PLL 56 read start timing signal

Claims (5)

[Claims] 1. An Internet information display device for displaying a video signal in a video signal on a screen, capturing data from the Internet via a telephone line, converting the data into a video signal, and displaying the video signal on a screen, comprising at least one frame. A graphic engine having a memory for converting the data into a video signal, video horizontal compression means for compressing the video signal extracted from the video signal in the horizontal direction of the screen, and a video engine for converting the video signal converted by the graphic engine to a screen A video horizontal compression means for compressing in the horizontal direction, a video synthesis means for horizontally synthesizing video signals compressed by the video horizontal compression means and the data horizontal compression means, and a video signal in the video signal, Either a video signal converted from the data or a video signal synthesized by the video synthesis means Internet information display device characterized by a switching means, and no order to display a video signal switching said switching means on the screen to switch. 2. The video horizontal compression means and the data horizontal compression means each have a line memory for storing a video signal for each scanning line, and the data horizontal compression means writes data to the line memory. And a line memory read control means for controlling reading from the line memory, wherein the line memory write control means outputs a horizontal synchronization signal and a vertical synchronization signal extracted from the video signal. 2. The Internet information display apparatus according to claim 1, wherein control is performed such that writing to said line memory is performed based on a timing based on the clock and a write clock that matches a clock frequency read by said graphic engine. 3. The line memory has a capacity to display an SVGA image in one screen in a horizontal direction, and the line memory read control means is configured to output the SVGA image based on a read clock having at least twice the frequency of the write clock. 3. The Internet information display device according to claim 2, wherein the Internet information display device is controlled to read from the line memory. 4. The line memory read control means and the line memory write control means write a video signal in the frame to the line memory by setting one of read start lines from the line memory in the frame.
4. The Internet according to claim 2, wherein the Internet is controlled so as to start from a phase corresponding to a phase immediately before the start of reading, and prevents overtaking between writing to the line memory and reading from the line memory. Information display device. 5. The line memory read control means includes phase adjustment means for adjusting a read start phase from the line memory, and the line memory write control means adjusts the read start phase adjusted by the phase adjustment means. 5. The Internet information display device according to claim 4, further comprising a phase changing means for changing a writing start phase to said line memory.