JPH0749680A - Digital image display system - Google Patents

Abstract

(57) [Summary] [Object] It is an object of the present invention to provide an image display system in which a display device and a computer main body are connected by a digital interface, transmission loss is suppressed, and function improvement is achieved. When a drawing command is sent from the interface circuit 16 connected to the internal bus of the computer main body 1A to the display device 2A, the drawing processing circuit 22 creates digital video data and a synchronizing signal via the interface circuit 21. Digital video data is VRAM23, LUT2
After being converted into a video signal by the DAC 25, it is amplified by the video circuit 26 and displayed on the CDT 28. [Effect] Since the video signal is transmitted as the digital drawing command signal, the transmission loss can be reduced, the function can be improved, and the location of the display device can be freely set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital image display system including a digital data output device such as a computer main body and a display device for displaying an image transmitted from the digital data output device. .

[0002]

2. Description of the Related Art At present, most display devices used in computer terminals and the like employ analog RGB video signals as an interface for their input video signals, and the display resolution has recently been high-definition display tendency. Accordingly, the horizontal deflection frequency is 90 kHz and the video signal band is about 150 MHz. As a result, problems such as loss and generation of unnecessary radiation noise occur when transmitting a video signal to a display device remote from the computer body.

Therefore, there is an attempt to solve the above problem by transmitting low-frequency digital video data as it is to a display device without converting the video signal into an analog signal on the computer main body side.

As a conventional technique of this type of display device, for example, the one described in JP-A-61-233779 can be cited. Here, the digital video data read from the image memory of the computer main body is output as a parallel signal to the display device side, digital-analog converted on the display device side, and converted back to an analog video signal to display the video. .

[0005]

In the above conventional example, for example, one screen has a standard display resolution of 640 × 480 (horizontal 6).
In the case of 40 dots and 480 vertical lines), if each RGB video signal is given 8-bit gradation (that is, 166.7 million colors can be displayed per dot of the above resolution), digital video data can be obtained. The data transfer rate required to transfer to the display device side reaches about 55 Mbytes / second. In addition, one screen has a high-definition display resolution used in the workstation class.
Approximately 280 × 1024 dots, and even if the display color per dot is 256 colors, a transfer rate of about 80 Mbytes / second is required. At present, this resolution is in the direction of being further improved, and the display color is also approaching to 16,670,000 colors which enables natural image display on a display device.

As described above, when the image to be displayed on the display device is transmitted from the computer body as digital image data, the amount of data to be transmitted becomes enormous. Therefore, in the above-mentioned conventional example, when transmitting digital video data in 8-bit parallel, a transfer clock frequency of about 55 MHz is simply required for the standard display resolution and about 80 MHz for the high definition display resolution. Therefore, as a result, the effect of reducing unnecessary radiation is not so great. Further, it is practically difficult to realize such high-speed data transfer while maintaining reliability without being affected by bit loss, noise, and the like. Furthermore,
If the data width to be transmitted is increased from 8 bits to 16 bits doubled to 32 bits doubled, the frequency of the transfer clock can be lowered, but the number of cables of the digital video data transfer cable increases and the handling becomes extremely difficult. It becomes inconvenient and it becomes impractical to increase the distance between the computer body and the display device.

Therefore, it is an object of the present invention to provide a digital image display system which requires a small amount of data to be transmitted when a video is transmitted from a computer body to a display device. Another object is to further improve the function by digital signal processing on the display device side.

[0008]

In order to solve the above problems, the computer main body is newly provided with interface means, and the display device side has interface means for receiving the drawing command signal, drawing processing means, and video memory means. Newly equipped with video digital-analog conversion means.

Further, the display device side is further provided with voice processing means, voice memory means, voice digital / analog converting means, speaker, microphone and voice analog / digital converting means.

Alternatively, the display device includes preprocessing means, clock generation means, video analog / digital conversion means and digital interface means, drawing processing means, switching control means, video memory means and video digital New analog conversion means.

Alternatively, the display device includes a digital interface means, a switching control means, a drawing processing means, a video memory means, and a video digital / display device which are different from the above.
An analog video signal input means and a video switching means other than the analog converting means are newly provided.

Further, the display device side is further provided with a sensor means, an A / D conversion means, an arithmetic control means and a characteristic memory means for holding characteristic data.

Alternatively, the computer side is provided with drawing processing means, compression processing means, and digital interface means, and the display device side is newly provided with digital interface means, decompression processing means, memory means, and video digital / analog conversion means. .

Alternatively, the computer main body side is provided with drawing processing means, video memory means, compression processing means and digital interface means, and the display device side is provided with digital interface means, decompression processing means and video digital / analog conversion means. Newly established.

Alternatively, input device interface means for the input device is further provided on the display device side.

[0016]

The above-mentioned means operate as follows. The digital interface means between the computer body and the display device outputs a drawing command and a voice command signal of the display device to the display side, and exchanges information such as control commands, operating states, audio files, and display characteristic data from the display device side. . Further, the drawing processing means creates video data for displaying a video from the drawing command. The video memory means holds the video data created by the drawing processing means for one screen. The video digital / analog conversion means converts the video data read from the video memory means into an analog video signal.

The voice processing means creates voice data from the voice command signal sent from the digital interface means, and conversely sends the voice data to the digital interface means as a voice command or a voice file.
The voice memory means temporarily holds the voice data created by the voice processing means. The audio digital / analog conversion means converts the audio data into an audio signal and produces sound from the speaker. The voice analog / digital conversion means converts the sound captured by the microphone into voice data.

Further, the pre-processing means performs clamp processing of the analog video signal input to the display device, extraction of the synchronizing signal, etc., and the clock generating means generates a sampling clock phase-synchronized with the synchronizing signal to generate a video analog signal. The digital converting means digitizes the video signal according to the sampling clock. Further, another drawing processing means creates video data from the drawing command signal, and appropriately switches the video data and the digitized video signal or performs an imposing process. The switching control means instructs switching control of such a video processing mode in another drawing processing means.

Still another drawing processing means creates video data of various resolutions, and the video switching means includes two kinds of video signals from the analog video signal input means and the video signal based on the video data created by the drawing processing means. Switch the video signal of. At this time, the switching control means controls the definition of the video data created by the drawing processing means, and also controls the video switching means via the drawing processing means.

Further, the sensor means detects the display characteristic of the display device, the A / D conversion means digitizes the displayed value, and the arithmetic control means arithmetically generates the digital value as characteristic data of the display device to produce a characteristic memory. To control. Further, the characteristic memory means holds the characteristic data.

The compression processing means performs information compression processing on the video data created by the drawing processing means to reduce the amount of information. The expansion processing means reproduces the compressed video data into the original information.

Further, the input device interface means takes in a control command from an input device such as a keyboard, a mouse, a touch panel, a pen input tablet or the like into the display device and converts it into a format which can be transmitted to the computer main body side by the digital interface means.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of the present invention. In the figure, a portion 1A surrounded by a one-dot chain line is a computer main body, in which 10 is a bus for data, address and control signals, 11 is an arithmetic control circuit (hereinafter referred to as CPU), 12 Is main memory,
Reference numeral 13 denotes an input / output port for connecting a computer external device such as a printer or a modem to the computer main body 1A
Reference numeral 14 is an external storage device interface for exchanging data with the external storage device 3 described later, 15 is an input device interface for inputting a control command from the input device 4 described later, and 16 is a digital signal through the bus 10. A digital data interface (hereinafter referred to as a digital I / F) for transmitting a video drawing command sent as data to a display device.

Further, a portion 2A surrounded by another chain line is a display device, in which 21 is a digital I / F for receiving a video drawing command transmitted as digital data from the computer main body 1A, 22
Is a drawing processing circuit for creating digital video data for displaying an image from the video drawing command received by the digital I / F 21, 23 is an image memory for holding the digital video data created by the drawing processing circuit 22 (hereinafter, referred to as an image memory). , VRAM), 24 a lookup table (hereinafter referred to as LUT), 25 a digital-analog converter (hereinafter referred to as DAC), 26 a video circuit, 27 a deflection circuit, 28 a color display tube (hereinafter referred to as CDT). ).

Further, 3 is an external storage device using a storage medium other than the main memory 12, such as a floppy disk, hard disk, magneto-optical disk, or magnetic tape, 4 is a keyboard, mouse, pen input tablet, touch panel, or the like. Input device 5 is a digital I / F 16, 21
CD that handles digital video data that can be connected to
It is a digital video media device such as a ROM, a magneto-optical disk recording / reproducing device, a scanner, an electronic still camera, a digital VTR, and a camera-integrated VTR (generally called a movie) capable of handling digital video data.

The operation of FIG. 1 is as follows. The computer main body 1A is a computer main body having a configuration similar to that of a general personal computer or workstation, but it is usually connected to the bus 10 and has analog RGB.
A digital I / F 16 is connected instead of the video graphic circuit for creating a video signal. When a control command is read from the input device 4 such as a keyboard or the external storage device 3 such as a floppy disk drive, the control command is taken into the CPU 11 via the external storage device interface 14 or the input device interface 15, An image drawing command is issued from the CPU 11 in response to the control command. The video drawing command is transmitted to the display device 2A as digital data via the digital I / F 16.

On the other hand, the display device 2A receives the transmitted video drawing command via the digital I / F 21, and the drawing processing circuit 22 interprets the received video drawing command to create digital video data. , A synchronizing signal (Hs, for driving the deflection circuit 27,
Vs) is also generated. The created digital video data is sequentially stored in the VRAM 23 and then read out for video display. Therefore, the VRAM 23 used here is of a 2-port memory type having separate input / output ports. The LUT 24 stores a conversion table for converting the digital video data read from the VRAM 23 into digital video data having color signal amplitude information to be actually displayed, and the color obtained by the conversion is stored. Digital video data with signal amplitude information is DAC
Sent to 25. The DAC 25 converts the digital video data into an analog RGB video signal and converts it into an input video signal form of a general display device. LUT
The contents of the conversion table stored in 24 can be rewritten by the rewriting signal from the drawing processing circuit 22, and the color displayed on the screen of the CDT 28 can be freely changed. It is also possible to omit the LUT 24, and in this case, the contents of the VRAM 23 correspond one-to-one with the signal amplitude information of each color of RGB. , The converted analog RGB video signal is input to the CDT 28 via the video circuit 26, and the synchronization signal generated by the drawing processing circuit 22 is also input to the CDT 28 via the deflection circuit 27. Similar image display is performed.

As described above, in the present embodiment, the image to be displayed from the computer main body 1A is transmitted to the display device 2A as an analog image signal or digital image data obtained by digitally converting the analog image signal as in the conventional case. Instead of the above, it is transmitted to the display device 2A as a video drawing command which is digital data to reduce the amount of data to be transmitted.

Now, with reference to FIG. 2, it will be described how the amount of data to be transmitted differs depending on whether the image to be displayed is transmitted as an image drawing command or is transmitted as digital image data.

FIG. 2 is an explanatory diagram showing a comparison between a case where a video to be displayed is transmitted as a video drawing command and a case where it is transmitted as digital video data.

For example, the display resolution of the display device 2A is one screen 640 × 480 (horizontal 640 dots, vertical 4 pixels).
In the case of 80 lines) dots, as an image,
Consider the case of displaying a line on the first line.
As shown in FIG. 2 (a), when this video is transmitted as a video drawing command, the command (command) for displaying a line on the top line is "LINE (0,0)-(0,640)". The image drawing command is transmitted as digital data from the computer body 1A to the display device 2A, and digital image data for displaying an image is created in the display device 2A and displayed on the screen. Therefore, basically, a simple video drawing command "LINE (0,0)-(0,640)" needs to be transmitted from the computer body 1A to the display device 2A in the form of digital data. The amount of data is small.

On the other hand, as shown in FIG.
When transmitting as digital video data, the data "11111 ......... 11111" representing the line on the top line, that is, "1" as one line of data corresponding to the top line (indicating that screen display is performed Data) 640
After the data is transmitted from the computer main body 1A to the display device 2A, the data for the remaining number of lines (479 lines) is transmitted and displayed on the screen as it is in the display device 2A. That is, when transmitting as digital video data, the data to be transmitted has a one-to-one correspondence with the display screen.
It is necessary to transmit 640 × 480 pieces of data from the display device 2A to the display device 2A, and the amount of data to be transmitted becomes very large.

As described above, in this embodiment, when a video image to be displayed on the display device is transmitted from the computer main body, the video image is transmitted as a video drawing command, so that the amount of data to be transmitted can be small. Therefore, the signal frequency on the transmission line is reduced, unnecessary radiation can be reduced, and there is no need to worry about the effects of bit loss, noise, etc., and it is not necessary to increase the number of cables.

An original interface can be used as the digital I / F 16 and 21, but S
The use can be expanded by using a general-purpose parallel interface such as a CSI interface or a printer interface, or a general-purpose serial interface such as a network interface. That is, for example, SCS
When the I interface is used, a multimedia image device such as a CD-ROM or an image capturing device such as a scanner is connected to the interface as the digital image media device 5, and the digital image data sent from the device 5 is displayed. It is also possible to take in the device 2A and display it directly on the display device 2A.
In this case, the drawing processing circuit 2 inside the display device 2A
2 communicates with the digital video media device 5 via the digital I / F 21, and when it determines what is connected as the digital video media device 5, the drawing process is performed according to the form of the digital video data. It has an intelligent processing function.

Therefore, in this embodiment, by directly connecting the digital video media device 5 capable of reproducing various video media, the video can be displayed on the screen of the display device 2A without the help of the computer main body 1A. .

In this embodiment, the digital I / F 1
Since 6 and 21 are connected by a bidirectional bus, the drawing processing circuit 22 and the VR are provided inside the display device 2A.
It is possible to detect the operating state of the AM 23, the LUT 24, etc., and transmit the detection result as a command to the computer main body 1A via the digital I / F 16, 21.
If such a transmission is performed, the operation can be confirmed when the power is turned on or when the factory is adjusted.

Next, FIG. 3 is a block diagram showing a second embodiment of the present invention. In the figure, a portion 2B surrounded by a one-dot chain line is a display device, in which 29 is a voice processing circuit, 210 is a voice memory circuit, 211 is a DAC for converting digital voice data into analog voice, and 2 is a voice memory circuit.
Reference numeral 12 is a speaker, 213 is an analog / digital converter (hereinafter referred to as ADC), and 214 is a microphone. Further, other reference numerals that are the same as those in FIG. 1 are the same as those in FIG.

The operation of FIG. 3 will be described below. In the present embodiment, as shown in FIG. 3, the display device 2B has a video drawing command and a voice processing command from the computer main body 1A or the digital video media device 5 shown in FIG. 1 as digital data on the same line. It is transmitted. The transmitted digital data is received through the digital I / F 21, and from the image drawing command therein, a circuit including a drawing processing circuit 22, a VRAM 23, a LUT 24, a DAC 25, etc. is used as in the display device 2A of FIG. An analog video signal is obtained. Also, the voice processing command is demodulated by the voice processing circuit 29 into an actual voice image, and is converted into digital voice data by the voice memory 210.
After being held by the D / A converter 211, it is converted into an analog audio signal. This audio signal is output as audio through the speaker 212.

As described above, in the present embodiment, video and audio can be transmitted using the same interface as the video drawing command and the audio processing command, and no additional line is required. Furthermore, when application software for handling video and audio is operated on the computer main body 1A side, by connecting the display device 2B of the present embodiment, video display and audio can be easily performed without the need for other additional circuits. Output is obtained.

Further, in this embodiment, the voice is taken in from the microphone 214, converted into digital voice data by the A / D converter 213, modulated by the voice processing circuit 29, and then the computer main body is passed through the digital I / F 21. It can be transmitted to 1A and used as voice data. As the voice input device, the speaker 2 is used instead of the microphone 214.
Twelve can also be used. In this case, the voice input from the speaker 212 is A / D as shown by the dotted line in FIG.
It is input to the conversion 213 and processed as described above.

FIG. 4 is a block diagram showing a third embodiment of the present invention. In the figure, a portion 2 surrounded by a dashed line
C is a display device, in which 33 is a drawing processing circuit different from the drawing processing circuit 22 shown in FIGS.
Is a pre-processing circuit, 35 is an ADC, 36 is a buffer circuit, 3
Reference numeral 7 is a PLL circuit, 38 is a signal switching circuit, and the same reference numerals as those in FIGS. 1 and 3 denote the same constituent elements.

The operation of FIG. 4 will be described below. In the present embodiment, as shown in FIG. 4, a video drawing command is transmitted as digital data from the computer body 1A shown in FIG. 1 to the display device 2C, and a general computer body, VTR, LD player, etc. An analog video signal (hereinafter referred to as a video signal) is transmitted from the video output device. The video drawing command transmitted as digital data is received via the digital I / F 21, and the drawing processing circuit 22 creates digital video data based on the video drawing command.

On the other hand, the transmitted video signal is input to the pre-processing circuit 34, and is subjected to image clamping processing and processing for extracting a synchronizing signal from the video signal when the video signal is a composite type. The video signal subjected to these processes is converted into digital video data by the ADC 35. Here, the sampling clock used for the ADC 35 is created by the PLL circuit 37 configured by a general phase lock circuit in order to synchronize with the synchronization signal output from the preprocessing circuit 34. The digital video data obtained by the conversion is sequentially read into the drawing processing circuit 33 via the buffer circuit 36.

The switching control circuit 38 is instructed by the user from the outside of the display device 2C as to what kind of video processing is to be performed, and the computer main body 1A also has a digital I / F 21 and a drawing processing circuit 33. A switching control command is given via. The switching control circuit 38 interprets these given instructions and commands and gives a predetermined instruction to the drawing processing circuit 33. In the drawing processing circuit 33, in accordance with an instruction from the switching control circuit 38, the digital image data created based on the image drawing command and the digital image data obtained by converting the video signal are switched and output, and at the same time, predetermined. Video processing. As a display form obtained by these switching and video processing, when either one of the video based on the video drawing command or the video based on the video signal is displayed on the CDT 28, either one is displayed on the screen of the CDT 28, There is a case where the other is displayed in a window at an appropriate place, the other is superimposed on one of the displayed images, or the image is enlarged or reduced or scrolled in each of the above cases. . The digital video data that has been switched or video-processed by the drawing processing circuit 33 in this way is then written to the VRAM 23. The subsequent circuit operation is similar to that of FIG.

Therefore, in the present embodiment, not only the normal video signal can be transmitted to the display device 2C in addition to the image drawing command and any one of those images can be displayed on the screen. Different types of images can be displayed simultaneously in various display modes.

Next, FIG. 5 is a block diagram showing a fourth embodiment of the present invention. Part 2D surrounded by the one-dot chain line in the figure
Is a display device, in which 41 is a drawing processing circuit different from the drawing processing circuit 22 of FIGS. 1 and 4, 42 is an analog signal switching circuit (hereinafter referred to as SW), and The same reference numerals as those in FIGS. 3 and 4 denote the same components.

The operation of FIG. 5 is as follows. In this embodiment, as shown in FIG. 5, the display device 2D includes:
Similar to FIG. 4, a video drawing command is transmitted as digital data from the computer main body 1A shown in FIG. 1, and a video signal is transmitted from a general computer main body or a video output device such as a VTR or an LD player. .
In the processing inside the display device 2D, the video signal is directly input to the SW 42 and the digital processing is not performed. On the other hand, the image drawing command is the drawing processing circuit 41, VR.
Each circuit of AM23, LUT24, and DAC25 converts into an analog video signal, and inputs into SW42.

Here, the drawing processing circuit 41 is instructed by the switching control circuit 38 similar to that shown in FIG.
It is determined whether the image based on the image drawing command or the image based on the video signal is selected as the image to be displayed on S8.
Control W42. The control method is as follows.

In the first display control mode, either one of the image based on the image drawing command transmitted to the display device 2D and the image based on the video signal is displayed on the CDT 28. At this time, if an image based on the video signal is selected, the synchronizing signals Hs and Vs that are input to the display device 2D along with the video signal are once input to the drawing processing circuit 41 and are directly applied to the deflection circuit 27. . Therefore, the synchronization signals Hs and Vs are equal to the synchronization signals Hs ′ and Vs ′ output from the drawing processing circuit 41. On the contrary, when the image based on the image drawing command is selected, the synchronization signal H
s ′ and Vs ′ are asynchronous with the synchronization signals Hs and Vs and are generated in a cycle suitable for display.

Next, in the second display control mode, the image based on the image drawing command is displayed in the window while the image based on the video signal is displayed. At this time, the input / output synchronization signals of the drawing processing circuit 41 are the same. Here, when the display resolution of the image based on the video signal is sufficiently higher than the display resolution of the image based on the image drawing command, the drawing control circuit 4
In 1, the digital video data is created in synchronization with the sync signals Hs and Vs based on the video drawing command, and thereafter, all the digital video data is read from the VRAM 23 at a predetermined timing and is analogized by the LUT 24 and the DAC 25 to be obtained. The analog video signal is switched to the video signal in the SW 42 at a predetermined timing, and the video based on the video drawing command is displayed in a window in the display area of the video based on the video signal.

This situation is shown in the timing chart of FIG. The display period of the video signal is the T1 period of FIG. 6 with respect to the horizontal synchronizing signal Hs of the video signal, and the drawing processing circuit 41
The control signal S1 of the SW42 issued from the switch selects the analog video signal output from the DAC 25 in the T2 period shorter than the T1 period, and selects the video signal in the other periods. As a result, the output from the SW 42 is switched as shown in FIG. 6, and a window can be displayed in the horizontal direction. In accordance with an instruction from the switching control circuit 38, the window display position is shifted by a control signal S issued from the drawing processing circuit 41 when the reading start time of the digital video data read from the VRAM 23 with respect to the horizontal synchronizing signal Hs is shifted.
1 can also be moved as shown by the dotted line in FIG. 6 to change the window display position. The same can be done in the vertical direction.

Next, when the display resolution of the image based on the video signal is equal to or lower than the display resolution of the image based on the image drawing command, the following processing is performed. FIG. 7 shows a timing chart in this case. Drawing processing circuit 41
If the digital video data held in the VRAM 23 is matched with the synchronization signal Hs and all of the data is read as it is, the video signal exceeds one horizontal period of the synchronization signal Hs like the output of the DAC 25 without processing shown in FIG. It will be. Therefore, the video data held in the VRAM 23 is thinned out and read out, and the drawing processing circuit 41 generates the control signal S1 so that the video signal is sufficiently contained within the horizontal period as in the post-processing DAC output shown in FIG. Control the SW 42. Similarly, processing is also performed in the vertical direction.

In this way, the display device 2 of FIG.
In D, two video signals can be switched and a window can be freely displayed on the screen of the CDT 28.

FIG. 8 is a block diagram showing the fifth embodiment of the present invention. In the figure, a portion 2 surrounded by a one-dot chain line
Reference numeral E denotes a display device, in which 71 is a drawing processing circuit different from the drawing processing circuits shown in the above figures, 72 is a writable read memory (hereinafter referred to as ROM),
Reference numeral 73 is a CPU, 74 is an ADC, 75 is a light receiving device such as a sensor or a camera, and the same reference numerals as those in FIG. 1 denote the same components.

The operation of FIG. 8 will be described below. Figure 8
In FIG. 1, the drawing process is performed in exactly the same manner as in the embodiment of FIG. 1, and the image drawing command is transmitted from the computer main body 1A shown in FIG. 1 to the display device 2E and received via the digital I / F 21. From the image drawing command to the drawing processing circuit 71, VRAM 23, LUT 24, DA
An analog video signal can be obtained by a circuit including C25 and the like.

On the other hand, ROM 72, CPU 73, ADC 7
4. The part including the light receiving device 75 measures and processes various characteristics related to the display of the display device 2E, and holds the obtained data. Here, as the characteristics to be measured,
The so-called gamma characteristics, maximum brightness, minimum brightness, color temperature, etc. of the CDT 28 are listed. As a method of measuring the characteristics,
The CPU 73 controls the drawing processing circuit 71 to cause the CDT 28 to display an all-white screen, RGB single-color screens, an intermediate brightness screen, a low brightness screen, and the like, and the light receiving device 75 measures the state on the tube surface of the CDT 28 at this time. . The measurement result is digitized by the ADC 74 and input to the CPU 73. CPU73
Then, a predetermined calculation is performed based on the level of the analog video signal output from the DAC 25 and the measurement result, and the result is used as the display characteristic data of the display device 2E in the ROM 7
Write to 2. The data thus written is transmitted to the computer main body 1A via the digital I / F 21 when the computer main body 1A makes a request or when the display device 2E is turned on. The transmitted characteristic data is read by the computer main body 1A and is used, for example, in so-called color matching, in which the color tone of the image displayed on the display device 2E is matched with the color tone of the printed matter when it is output to a printer or the like. Correction instruction data for correcting the deviation from the printed matter at this time by the display device 2E is sent from the computer main body 1A to the display device 2E, and the drawing processing circuit 71 and the CPU 73 correct the analog video signal to be output to the DAC 25. , It is possible to display an image with a color tone that matches the printed matter.

FIG. 9 is a block diagram showing a sixth embodiment of the present invention. In the figure, a portion 1B surrounded by a one-dot chain line is a computer main body, in which 81 is a drawing processing circuit,
Reference numeral 82 denotes a compression circuit, which is a portion 2 surrounded by another alternate long and short dash line.
F is a display device, of which 83 is a decompression circuit. Other reference numerals that are the same as those in FIG. 1 are the same components.

The operation of FIG. 9 is as follows. CPU 11, main memory 12, I / O port 13, external storage device I / F 14, input device I / F 15 in the computer main unit 1B
Each circuit portion of the CPU operates similarly to a general computer, and various control commands and digital video data input to the CPU 11 from the external storage device 3, the input device 15 and the like via the bus 10 are stored in the CPU 11. After being processed, a control command relating to image generation is sent to the drawing processing circuit 81. The drawing processing circuit 81 develops this control command into digital video data for actually displaying a video. Here, since the information amount of this digital video data is an enormous amount of information of several hundreds of Mbytes per second, the compression circuit 82 compresses the information amount to several tenths to hundreds of tenths. Is set to a level that can be transferred by the digital I / F 16.
The compressed digital video data is digital I /
It is output from F16 to the display device 2F.
In addition to the digital video data, the drawing processing circuit 81 also creates sync signal information of the display device 2F and display control data for controlling the display state, which is output from the digital I / F 16 to the display device 2F together with the digital video data. It

In the display device 2F, the digital I
The digital video data and display control data compressed by / F21 are received and passed to the expansion circuit 83 of the next stage. The decompression circuit 83 decompresses the compressed digital video data, reproduces it as the original digital video data, and then writes it in the VRAM 23. In addition, the expansion circuit 8
3 is the display device 2 from the display control data
The horizontal / vertical synchronizing signals (Hs, Vs) necessary for driving the F deflection circuit 27 are created, and the setting value of the LUT 24 is rewritten to change the display color and the video signal level of the display video. . After storing the digital video data in the VRAM 23 as described above, the LUT 24, DA
It is taken out as an analog video signal by each processing of C25, passes through the video circuit 26, and is driven on the CDT 28 to be displayed on the CDT 28. In this embodiment, by compressing the digital video data on the transmitting side and expanding the digital video data on the receiving side, the digital digital video data can be transmitted by a method based on general interface specifications.

In the present embodiment, as in the case shown in FIG. 5, when the switching control circuit 38, the analog signal switching circuit 42, etc. are provided and the video signal is inputted from the outside, the expansion circuit 83 is used. By controlling the analog signal switching circuit 42, the same effect as that of the embodiment of FIG. 5 can be obtained.

Next, FIG. 10 is a block diagram showing a seventh embodiment of the present invention. In the figure, a portion 1C surrounded by a one-dot chain line is a computer main body.
Is a VRAM for storing digital video data, 9
Reference numeral 2 is a compression circuit, and the same reference numerals as those in FIGS. 1 and 9 denote the same components. Further, the portion 2G surrounded by the one-dot chain line is a display device, in which 93 is an expansion circuit, and the same reference numerals as those in FIG. 1 denote the same constituent elements.

In this embodiment, C is the same as that shown in FIG.
The control command relating to the image generation created by the PU 11 is sent to the drawing processing circuit 81 to create digital image data. The digital video data created by the drawing processing circuit 81 is once stored in the VRAM 91, and the compression circuit 9 of the next stage is used.
2 reads the stored digital video data. The compression circuit 92 compresses the read digital video data, and sets the data amount to an information amount that can be transmitted by the digital I / F 16. Further, the drawing processing circuit 81 outputs control data relating to display of the display device 2G such as synchronization signal information and display color, and the digital I / F 16
Sent to. Therefore, the digital I / F 16 compresses the digital video data and the display device 2G.
The control data of is output.

In the display device 2G, the digital I
The data is sequentially sent to the decompression circuit 93 via / F21. The expansion circuit 93 expands the compressed digital video data, restores it to the original digital video data format, and outputs it to the video circuit 26 as an analog video signal by the LUT 24 and the DAC 25. In addition, the expansion circuit 93
Generates a synchronization signal (Hs, Vs) to be given to the deflection circuit 27 from the control data of the display device, and the LUT 24.
Create setting value change data. As described above,
A large amount of digital video data can be transmitted on the line based on general interface specifications, and it is possible to suppress image quality deterioration and unnecessary radiation generation on the transmission line.

Also in this embodiment, as in the case shown in FIG. 5, when the switching control circuit 38, the analog signal switching circuit 42, etc. are provided and the video signal is inputted from the outside, the expansion circuit 93 is used. By controlling the analog signal switching circuit 42, the same effect as that of the embodiment of FIG. 5 can be obtained.

FIG. 11 is a block diagram showing the eighth embodiment of the present invention. In the figure, a portion 2H surrounded by a chain line indicates a display device, in which 101
Is an input device interface circuit (hereinafter, input device I /
F) and 102 are input devices, and the same reference numerals as those in FIG. 1 have the same functions.

The operation of FIG. 11 will be described below. In this embodiment, a computer main body 1A as shown in FIG. 1 and a display device 2H are connected, and digital digital video data sent from the computer main body 1A includes a digital I / F 21, a drawing processing circuit 22, and a VRAM.
23, LUT 24, and DAC 25 generate an analog video signal in the same manner as in FIG. 1, and the video circuit 26 and the deflection circuit 27 display an image on the CDT 28. Further, in the display device 2H shown in FIG. 11, input devices such as a keyboard, a mouse, a touch panel, and a pen tablet are connected, and the input device I / F 101 is the input device 102.
Capture information from. The input device I / F 101 converts the captured information into a predetermined format, and digital I / F 101
It is sent as a control command to the computer main body 1A via 21. The computer main body 1A side processes the control command and creates information to be displayed on the display device 2H. The information created in this manner is used as digital video data in the digital I / F 16 of the computer main unit 1A.
The display device 2H displays a new image.

As described above, in this embodiment, the display device 2H is used.
By adding the input means 102 to the computer main body 1
Even if the installation distance from A is large, information can be input in the immediate vicinity of the display device 2H, and a high-quality image can be displayed without loss of the video signal due to transmission.

FIG. 12 is a block diagram showing the ninth embodiment of the present invention. In the figure, 1A is a computer main body, 2a,
2b and 2c are display devices, and IF is a digital interface. The computer main body 1A is shown in FIG.
, And each display device has the same structure as that shown in FIG. 1, FIG. 3, FIG. 4, FIG. 5, FIG. In this embodiment, the image drawing command output from the computer main body 1A to the digital interface IF is the digital interface IF.
Is input to each of the display devices 2a, 2b, 2c connected to, and video images are individually displayed. Here, when a selection command for instructing which display device is output is output prior to the video drawing command, the interface circuit of each display device judges this and the video drawing command sent to the corresponding display device next. Is captured. In this way, the display device 2a, 2b, 2c in which the selection command is connected to the digital interface IF
If you select all, the same image is displayed at the same time. Further, when the selection command selects the display device 2a, only the image display of the display device 2a is switched to a new one. As described above, it is possible to connect a plurality of display devices to the digital interface IF and display the images individually, or all of them at the same time with the same display content, and the usability can be expanded.

[0070]

According to the present invention, information capable of realizing digital video data for displaying a high-resolution video from the computer side to the display device side by using a digital interface generally used based on the standard. It is possible to perform transmission at a transmission rate, and it is possible to reduce line loss, the influence of noise, unnecessary radiation due to high-frequency components of the signal to be transmitted, etc. as compared with the case of transmitting with a conventional analog video signal. In addition, since the computer main body and the display device can be installed separately, the installable range is expanded compared to the conventional system. Further, since the signals are transmitted in the form of digital signals, not only video signals but also audio signals and display control information can be transmitted from the computer side to the display device side on the same line. Conversely, the internal information of the display can be recognized from the display device side to the computer main body side. Furthermore, since the drawing process is performed on the display device side, it is possible to display an image combined with another input image signal, and it is possible to easily improve further functions and usability. As described above, the present invention exhibits various effects.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment according to the present invention.

FIG. 2 is an explanatory diagram showing a comparison between a case where a video to be displayed is transmitted as a video drawing command and a case where it is transmitted as digital video data.

FIG. 3 is a block diagram showing a second embodiment according to the present invention.

FIG. 4 is a block diagram showing a third embodiment according to the present invention.

FIG. 5 is a block diagram showing a fourth embodiment according to the present invention.

FIG. 6 is a timing chart illustrating the operation of FIG.

FIG. 7 is a timing chart illustrating the operation of FIG.

FIG. 8 is a block diagram showing a fifth embodiment according to the present invention.

FIG. 9 is a block diagram showing a sixth embodiment according to the present invention.

FIG. 10 is a block diagram showing a seventh embodiment according to the present invention.

FIG. 11 is a block diagram showing an eighth embodiment according to the present invention.

FIG. 12 is a block diagram showing a ninth embodiment according to the present invention.

[Explanation of symbols]

1A, 1B, 1C ... Computer main body, 11 ... CPU,
16, 21 ... Digital interface circuit, 2A, 2
B, 2C, 2D, 2E, 2F, 2G, 2H ... Display device, 22, 41, 71, 81 ... Drawing processing circuit, 2
3, 91 ... Memory circuit for holding digital video data, 2
4 ... Look-up table, 25 ... Digital / analog conversion circuit, 29 ... Voice processing circuit, 210 ... Voice memory circuit, 101 ... Second input device interface circuit

Claims (14)

[Claims] 1. An image display system comprising a digital data output device and a display device for displaying an image transmitted from the digital data output device, wherein the digital data output device is for displaying an image. A CPU that creates and outputs a video drawing command, and the CPU
First digital interface means for transmitting the image drawing command output from the display device to the display device, wherein the display device receives the transmitted image drawing command, and second digital interface means for receiving the image drawing command. Drawing processing means for respectively creating digital video data and a synchronizing signal based on a video drawing command received by the second digital interface means, and digital video data created by the drawing processing means are once held and then output. Image memory means, digital / analog conversion means for converting the digital video data output from the image memory means into an analog video signal and outputting the analog video signal, and the analog video signal output from the digital / analog conversion means and the drawing Sync signal created by the processing means And a display means for displaying an image based on the above. 2. An image display system comprising a digital data output device and a display device for displaying an image transmitted from the digital data output device, wherein the digital data output device is for displaying an image. A CPU that creates and outputs a video drawing command and a voice processing command for performing audio reproduction, and a first digital interface unit that transmits the video drawing command and the voice processing command output from the CPU to the display device. And a second digital interface unit for receiving the transmitted video drawing command and audio processing command, and the display device based on the video drawing command received by the second digital interface unit. Drawing for creating digital video data and sync signal respectively A processing means, an image memory means for temporarily holding the digital video data created by the drawing processing means, and then outputting the digital video data; and a digital video data output from the image memory means for converting into an analog video signal and outputting the analog video signal. One digital-analog converting means, display means for displaying an image based on the analog video signal output from the first digital-analog converting means and the synchronization signal created by the drawing processing means, and the second Based on the voice processing instructions received by the digital interface means of
Voice processing means for producing digital voice data, voice memory means for temporarily holding the digital voice data produced by the voice processing means, and then outputting the voice data, and digital voice data output from the voice memory means for analog voice signals. A second digital-analog converting means for converting and outputting to a voice, and a voice output means for outputting a voice based on the analog voice signal output from the second digital-analog converting means. Characteristic digital image display system. 3. An image display system comprising a digital data output device and a display device for displaying an image transmitted from the digital data output device, wherein the digital data output device is for displaying an image. A CPU that creates and outputs a video drawing command and a switching control command for performing switching control, and the CPU
First digital interface means for transmitting the video drawing command and the switching control command output from the display device to the display device, the display device receiving the transmitted video drawing command and the switching control command. Second digital interface means, pre-processing means for clamping and outputting an analog video signal input from outside in addition to the video drawing command, and extracting and outputting a synchronization signal from the analog video signal; A clock generating means for generating and outputting a clock signal phase-synchronized with the synchronizing signal from the synchronizing signal output from the pre-processing means, and a clock signal output from the clock generating means as a sampling clock. Convert the analog video signal output from the preprocessing means to digital video data Analog-to-digital converting means for outputting and temporarily outputting the digital video data output from the analog-to-digital converting means, and temporarily holding and outputting the digital video data, and a switching control command received by the second digital interface means. Alternatively, in addition to the switching control command, a digital video image is output based on a switching control unit that outputs a switching instruction based on an externally input image processing instruction and an image drawing command received by the second digital interface unit. Data and a sync signal are respectively created, and one of the created digital video data and the digital video data output from the temporary holding means is selected in accordance with a switching instruction output from the switching control means. Drawing processing means for outputting and the drawing Image memory means for temporarily holding the digital video data output from the processing means, and outputting the digital video data; and digital-analog conversion means for converting the digital video data output from the image memory means into an analog video signal and outputting the analog video signal. A digital image display system comprising: an analog video signal output from the digital-analog conversion means and a display means for displaying a video based on the synchronization signal created by the drawing processing means. 4. An image display system comprising a digital data output device and a display device for displaying an image transmitted from the digital data output device, wherein the digital data output device is for displaying an image. A CPU that creates and outputs a video drawing command and a switching control command for performing switching control, and the CPU
First digital interface means for transmitting the video drawing command and the switching control command output from the display device to the display device, the display device receiving the transmitted video drawing command and the switching control command. Switching control for outputting a switching instruction based on the second digital interface means and the switching control command received by the second digital interface means or an instruction concerning video processing input from outside separately from the switching control command. Means and the switching instruction output from the switching control means, the image drawing received by the second digital interface means in synchronism or asynchronously with a synchronizing signal input from outside separately from the image drawing command. Based on the instruction, digital projection The image data and the synchronizing signal are respectively created, and the drawing processing means for outputting the selection signal in accordance with the switching instruction output from the switching control means, and the digital video data created by the drawing processing means are temporarily held and then output. Image memory means, digital / analog conversion means for converting the digital video data output from the image memory means to an analog video signal and outputting the analog video signal, and externally input according to the selection signal output from the drawing processing means. Selection means for selecting and outputting any one of an analog video signal externally input together with the synchronization signal and an analog video signal output from the digital-analog conversion means, and an analog output from the selection means Video based on the video signal and the synchronization signal created by the drawing processing means Digital image display system characterized in that it comprises an, and display means for displaying. 5. An image display system comprising a digital data output device and a display device for displaying an image transmitted from the digital data output device, wherein the digital data output device is for displaying an image. A CPU that creates and outputs a video drawing command, and the CPU
First digital interface means for transmitting the image drawing command output from the display device to the display device, wherein the display device receives the transmitted image drawing command, and second digital interface means for receiving the image drawing command. Drawing processing means for respectively creating digital video data and a synchronizing signal based on a video drawing command received by the second digital interface means, and digital video data created by the drawing processing means are once held and then output. Image memory means, digital / analog conversion means for converting the digital video data output from the image memory means into an analog video signal and outputting the analog video signal, and the analog video signal output from the digital / analog conversion means and the drawing Sync signal created by the processing means Based on the display means and an external sensor connected to an external sensor for detecting and outputting a display state on the display means, and an analog signal for converting a detection signal output from the external sensor into digital detection data and outputting the digital detection data. Digital converting means, calculating means for creating characteristic data of the display device by calculation based on digital detection data output from the analog / digital converting means, and temporarily holding the characteristic data created by the arithmetic processing means After that, it comprises a memory means for outputting,
A digital image display system characterized in that characteristic data output from the memory means is transmitted to the digital data output device via the drawing processing means and second digital interface means. 6. An image display system comprising a digital data output device and a display device for displaying an image transmitted from the digital data output device, wherein the digital data output device is for displaying an image. A CPU that creates and outputs a command, a drawing processing unit that creates digital video data and sync signal data based on the command output from the CPU, and data compression of the digital video data created by the drawing processing unit. Then, the data compression means for outputting as compressed video data, and the first digital interface means for transmitting the compressed video data output from the data compression means and the synchronization signal data created by the drawing processing means to the display device, respectively. And, the display device is Second digital interface means for receiving the compressed video data and sync signal data thus received, and decompressing the compressed video data received by the second digital interface means to output the original digital video data, and A data decompression means for creating a sync signal from the sync signal data received by the second digital interface means, and an image memory means for temporarily holding the digital video data output from the data decompression means and outputting the digital video data. A digital / analog conversion means for converting the digital video data output from the image memory means into an analog video signal and outputting the analog video signal, an analog video signal output from the digital / analog conversion means and the data decompression means. Video based on sync signal Digital image display system characterized in that it comprises an, and display means for displaying. 7. An image display system comprising a digital data output device and a display device for displaying an image transmitted from the digital data output device, wherein the digital data output device is for displaying an image. A CPU that creates and outputs a command, a drawing processing unit that creates digital video data and sync signal data based on the command output from the CPU, and a digital video data created by the drawing processing unit as a digital video An image memory unit for holding data once and outputting it, a data compression unit for compressing the digital video data output from the image memory unit and outputting it as compressed video data, and a compression unit for outputting the data. The video data and the sync signal data created by the drawing processing means First digital interface means for respectively transmitting to the display device, wherein the display device receives second digital interface means for receiving the transmitted compressed video data and sync signal data, and the second digital interface means. Data decompression means for decompressing the compressed video data received by the digital interface means to output the original digital video data and outputting the same, and for generating a synchronization signal from the synchronization signal data received by the second digital interface means. And a digital / analog conversion means for converting the digital video data output from the data expansion means into an analog video signal and outputting the analog video signal, and an analog video signal output from the digital / analog conversion means and the data expansion means Was done Digital image display system characterized in that it comprises an, and display means for displaying an image based on the period signal. 8. An image display system comprising a digital data output device and a display device for displaying an image transmitted from the digital data output device, wherein the digital data output device is for displaying an image. A CPU for creating and outputting a command and a switching control command for performing switching control, a drawing processing unit for creating digital video data and sync signal data, respectively, based on the command output from the CPU, and the drawing process. Data compression means for compressing the digital video data created by the means and outputting it as compressed video data, compressed video data output from the data compression means, synchronization signal data created by the drawing processing means, and the CPU The switching control command output from the display device to the display device. A first digital interface unit for transmitting the compressed image data, the synchronizing signal data, and a switching control command, the second digital interface unit for receiving the compressed video data, the synchronization signal data, and the switching control command. Switching control command that is output from the switching control command based on the switching control command received by the digital interface device 2 or a command related to video processing that is externally input separately from the switching control command. In accordance with the switching instruction, the compressed video data received by the second digital interface means is decompressed in synchronization with or asynchronously with a synchronization signal input from outside separately from the compressed video data and the synchronization signal data. , To the original digital video data And a data decompression means for outputting a selection signal in accordance with the switching instruction output from the switching control means, and generating a synchronization signal from the synchronization signal data received by the second digital interface means. Image memory means for temporarily holding the digital video data output from the digital video data, digital-analog conversion means for converting the digital video data output from the image memory means to an analog video signal and outputting the analog video signal, and the data. According to the selection signal output from the decompression means, either one of an analog video signal input from the outside together with the synchronization signal input from the outside and an analog video signal output from the digital-analog conversion means is selected. Selecting means for outputting the output and the output of the selecting means. A digital image display system, comprising: a display means for displaying an image on the basis of the analog video signal and the synchronization signal generated by the data expansion means. 9. An image display system comprising a digital data output device and a display device for displaying an image transmitted from the digital data output device, wherein the digital data output device is for displaying an image. A CPU for creating and outputting a command and a switching control command for performing switching control, a drawing processing unit for creating digital video data and sync signal data, respectively, based on the command output from the CPU, and the drawing process. Image memory means for temporarily holding the digital video data created by the means and then outputting the digital video data, and data compression means for compressing the digital video data output from the image memory means and outputting it as compressed video data. And compressed video data output from the data compression means And a first digital interface unit for transmitting the synchronization signal data created by the drawing processing unit and the switching control command output from the CPU to the display unit, respectively. The second digital interface means for receiving the compressed video data, the synchronization signal data, and the switching control instruction, and the switching control instruction received by the second digital interface means or the switching control instruction is input from the outside. A switching control unit that outputs a switching instruction based on an instruction related to video processing, and a synchronization signal that is externally input separately from the compressed video data and the synchronization signal data according to the switching instruction output from the switching control unit. Then or asynchronously The compressed video data received by the second digital interface means is decompressed to output the original digital video data and output, and a sync signal is created from the sync signal data received by the second digital interface means. At the same time, data decompression means for outputting a selection signal according to the switching instruction outputted from the switching control means, and digital-analog conversion means for converting the digital video data outputted from the data decompression means into an analog video signal and outputting the analog video signal. In accordance with the selection signal output from the data decompression means, one of an analog video signal externally input together with the synchronization signal externally input and an analog video signal output from the digital / analog conversion means is output. Selecting means for selecting and outputting, and the selecting means A digital image display system comprising: an analog video signal output from the selection means and a display means for displaying a video based on the synchronization signal created by the data expansion means. 10. An image display system comprising a digital data output device and a display device for displaying an image transmitted from the digital data output device, wherein the digital data output device is for displaying an image. A CPU that creates and outputs a video drawing command, and the CPU
First digital interface means for transmitting the image drawing command output from the display device to the display device, wherein the display device receives the transmitted image drawing command, and second digital interface means for receiving the image drawing command. Drawing processing means for respectively creating digital video data and a synchronizing signal based on a video drawing command received by the second digital interface means, and digital video data created by the drawing processing means are once held and then output. Image memory means, digital / analog conversion means for converting the digital video data output from the image memory means into an analog video signal and outputting the analog video signal, and the analog video signal output from the digital / analog conversion means and the drawing Sync signal created by the processing means Is connected to an input device for inputting a command from the outside and outputting it as a command signal, and the command signal output from the input device is connected to the second means.
Input device interface means for sending the command signal to the digital data device, when the command signal is sent from the input device interface means. A digital image display system characterized in that it is transmitted to. 11. The digital image display system according to any one of claims 1 to 10, wherein the first and second digital interface means comprise general-purpose interface means based on general-purpose interface specifications. A digital image display system, wherein a computer peripheral device having the general-purpose interface means can be connected between the first and second digital interface means. 12. The digital image display system according to claim 1, wherein the digital image display system comprises one digital data output device and a plurality of display devices. Digital image display system. 13. The digital image display system according to any one of claims 1 to 10, wherein the second digital interface means sets the operating state of the drawing processing means or the image memory means to the digital data. A digital image display system, which is capable of being transmitted to an output device. 14. The digital image display system according to any one of claims 1 to 10, wherein the digital data output device is a computer main body or a CD-ROM.
A ROM device, a hard disk device, a magneto-optical disk device, a digital VTR, a digital camera, a scanner device, a modulation / demodulation device connected to a communication line, or a demodulation device that receives broadcast radio waves and reproduces video data. Digital image display system.