JP2002318571A - Video display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a personal computer to surely output signals which are made adaptive to a monitor section when video output of the personal computer is transmitted to the monitor section through an AV selector and displayed. SOLUTION: When a monitor section 3 is set for a digital inputting and a personal computer 1 is set for an analog outputting, a digital replacement means 2c of an AV selector 2 reads data indicating the conditions or the like of inputted video signals from a ROM 3a of the section 3, the data are temporarily stored in a second memory section 2c2, the data are replaced by the data having a prescribed form in a replacement section 2c3 and written into a ROM 2c4. A personal computer 1 reads the effect that the resolution condition of the inputted video signals and the instruction, in which analog signals are to be outputted for the selector 2, and video signal are outputted from a video signal generating means 1b. An A/D converting section 2b of the selector 2 converts the analog format video signals into digital video signals and transmits the signals to the section 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display system, and more particularly, to a case where an image output of a personal computer is sent to a monitor unit via an AV selector and displayed, the personal computer is adapted to the monitor unit. The present invention relates to a video display system capable of reliably outputting a signal.

[0002]

2. Description of the Related Art FIG. 4 is a main block diagram showing an example of a conventional video display system for transmitting a video output of a personal computer 21 (hereinafter, a personal computer) to a monitor unit 23 via an AV selector 22 and displaying the same. . In the figure, data and the like indicating the condition of an input video signal are
It is written in the OM 23a in advance. The data indicating the video signal conditions include, for example, a resolution rate, horizontal and vertical frequency ranges, and an analog or digital type of the input video signal. In addition to the above data, data such as a model ID, a model name, and a serial number relating to the specification of the monitor unit 23 are written in the ROM 23a. In order for the personal computer 21 to read the write data in the ROM 23a, the personal computer 21 and the AV selector 22 and the monitor unit 23 are connected to the communication lines 24, 25 (through) and the
26, and read means 21a of the personal computer 21 through the communication line.
Recognizes the condition of the input video signal of the monitor unit 23.

In addition to the video signal from the video signal generating means 21b of the personal computer 21 via the signal line 27, a plurality of video signals are input to the AV selector 22, and one of the selected video signals is selected from the video signals. Is transmitted to the monitor unit 23 via the signal line 28. Here, in the AV selector 22, the personal computer 21
Is selected, it is assumed that the video output of the personal computer 21 is an analog signal and the form of the input video signal in the write data of the ROM 23a of the monitor unit 23 is a digital signal. In this case, the reading means 21a of the personal computer 21 reads that the form of the input video signal of the monitor unit 23 is a digital signal.
Since the b side is an analog output, the two do not match, and contradiction occurs. As a result, since the personal computer 21 cannot read the resolution rate or the like of the video signal, it cannot output a video. As described above, the conventional video display system has a problem that the personal computer 21 cannot output video in relation to the monitor unit 23.

[0004]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a video display system in which a personal computer 21 can read the resolution and the like of a monitor unit 23 and output a video image without being influenced by data written in the monitor unit 23. The purpose is to provide.

[0005]

In order to achieve the above object, the present invention provides a digital video signal input and displaying the input video signal, and data indicating the condition of the input video signal as data identifying itself. ROM stored in advance together with
A switching unit that switches and selects a required one from a plurality of analog input video signals;
An A / D conversion unit that converts an analog video signal from the switching unit into a digital video signal and outputs the digital video signal to the monitor unit;
An AV selector including data replacement means for reading data from the ROM of the monitor unit and replacing and storing the read data; and reading and reading data stored in the data replacement means of the AV selector. And a personal computer which outputs an analog video signal suitable for the data to the switching section of the AV selector.

[0006] Alternatively, a monitor unit provided with a ROM in which an analog video signal is input and displays the input video signal, and data indicating conditions of the input video signal is stored in advance together with data specifying itself. A switching unit for switching and selecting a required one from a plurality of analog input video signals; and a D / A for converting a digital video signal from the switching unit into an analog video signal and outputting the analog video signal to the monitor unit.
An AV selector comprising a conversion unit, data replacement means for reading data from the ROM of the monitor unit, and replacing and storing the read data; and data stored in the data replacement means of the AV selector. reading,
It is an object of the present invention to provide a video display system comprising a personal computer for outputting a digital video signal suitable for the read data to a switching section of the AV selector.

The data replacement means includes a first memory unit storing data specifying an AV selector in advance, a second memory unit storing data read from a ROM of the monitor unit, A replacement unit for performing data replacement as data held by the AV selector from data in the first memory unit and data in the second memory unit, a ROM storing the data replaced by the replacement unit, the first memory unit, It comprises a second memory unit, a replacement unit, and a control unit for controlling the ROM.

The data read by the personal computer from the data replacement means of the AV selector is
It is assumed that the resolution data and the output form of the video signal are analog or digital data.

The data writing method of the ROM in the monitor section or the ROM in the data replacing means is an EDID (Extended Display Identification Data).
a) The method shall be used.

[0010] The reading of data of the AV selector from the monitor section or the reading of data of the personal computer from the AV selector is performed by a DDC (Display Data).
Channel) standard communication line.

[0011]

Embodiments of the present invention will be described below with reference to the drawings based on embodiments. FIG. 1 is a main block diagram showing one embodiment of a video display system according to the present invention.
FIG. 2 is a main block diagram showing another embodiment of the video display system according to the present invention, and FIG. 3 is an explanatory diagram of data replacement.
In FIG. 1, reference numeral 1 denotes a personal computer, which includes a reading unit 1a for reading a condition of a video signal to be output and a video signal generating unit 1b for generating and outputting a video signal meeting the read condition. Note that the output form of the video signal is an analog signal output. Reference numeral 2 denotes an AV selector, which is a switching unit 2a for switching and selecting a required one from a plurality of analog input video signals including the personal computer 1, and converting an analog video signal from the switching unit 2a into a digital video signal. A / D converter
2b, and data replacement means 2c for reading data indicating the condition of the video signal from the monitor unit 3, replacing the data, and storing the data.

Reference numeral 3 denotes a monitor unit, and A of the AV selector 2
While displaying the digital video signal from the / D conversion unit 2b, it has a ROM 3a for storing data indicating conditions of the input video signal in advance. 4 is a signal line between the personal computer 1 (video signal generating means 1b) and the AV selector 2 (switching unit 2a), and 5 is a signal line between the AV selector 2 (A / D converter 2b) and the monitor unit 3. , 6 are the personal computer 1 (reading means 1a) and the AV
Communication line with selector 2 (data replacement means 2c), 7 is A
V selector 2 (data replacement means 2c) and monitor section 3 (RO
M3a). FIG. 3A shows an example of write data in the ROM 3a held by the monitor unit 3. As shown in the figure, the ROM 3a stores, as data indicating the conditions of the input video signal, a resolution ID, horizontal and vertical frequency ranges, an analog or digital type of the input video signal, and a model ID relating to the specification of the monitor unit 3. , Model name and serial number are also written.

Next, the operation of the present invention will be described. As described above, the personal computer 1 (video signal generating means 1b)
Is an analog output, and the video input of the monitor unit 3 is a digital input. In this case, if the personal computer 1 directly reads the data in the ROM 3a of the monitor 3, a contradiction occurs, and as a result, the personal computer 1 cannot output video as described above. Therefore, the data is replaced by the data replacing means 2c of the AV selector 2. Hereinafter, data replacement in the data replacement means 2c will be described. Data such as a model ID, a model name, and a serial number for specifying the AV selector 2 is stored in the first memory unit 2c1 in advance. Further, the control unit 2c5 reads data from the ROM 3a of the monitor unit 3 via the communication line 7, and temporarily stores the data in the second memory unit 2c2. The stored data is the data shown in FIG.

The data in the first memory unit 2c1 is read, and a part of the data in the second memory unit 2c2 that has been read is replaced with the data in the first memory unit 2c1 that has been read. This data replacement is processed by the replacement unit 2c3. FIG. 3B shows the partially converted data. The items marked with * in the figure, ie, the model ID, the model name, and the serial number are replaced from the data in the monitor unit 3 to the data in the AV selector 2, and the data indicating the type of analog or digital is changed from digital to analog. Is done. In contrast,
The resolution rate and the data in each of the horizontal and vertical frequency ranges must be the same data, so that no change is required. The data replaced by the replacement unit 2c3 and the unmodified data are written to the ROM 2c4. That is, ROM
2c4 has the data shown in FIG. 3 (B).
Note that the first memory unit 2c1 and the second memory unit
Each function of 2c2, replacement unit 2c3 and ROM 2c4 is controlled by control unit 2c5.
Is controlled by

In the above state, the reading means of the personal computer 1
1a reads the write data from the ROM 2c4 of the AV selector 2 via the communication line 6. The target of the signal output is the AV selector 2 by this reading, and the output form thereof is analog output and coincides with its own output form, and the data in the resolution rate, horizontal and vertical frequency ranges can be read. Becomes As a result, the personal computer 1 can output an analog video signal without causing inconsistency as in the related art (FIG. 4) when outputting a video signal (video signal generating means 1b). Although not shown, the actual video output from the video signal generating means 1b of the personal computer 1 is a signal output in the form specified in the read resolution rate or the display screen in each of the horizontal and vertical frequency ranges. The output signal is supplied to the switching section 2a of the AV selector 2 and the A / D
It is digitally output to the monitor unit 3 via the conversion unit 2b. FIG. 1 described above shows a case where the personal computer 1 has an analog output and the monitor section 3 has a digital input. However, the opposite case, that is, the personal computer 1 has a digital output and the monitor section 3 has an analog input. Also in this case, the personal computer 1 can output video. FIG. 2 shows an embodiment for this purpose.

Hereinafter, FIG. 2 will be described focusing on differences from FIG. In the write data of the ROM 13a of the monitor unit 13, the analog or digital type of the input video signal of FIG. 3A is analog (not shown). The A / V selector requires a D / A converter 12b to output a digital signal as an analog signal. Further, data in which the analog or digital type of the input video signal shown in FIG. 3B is digital is written into the ROM 12c of the data replacing means 12c (not shown). The video signal generating means 11b of the personal computer 11 outputs digital signals. The functional operation of each of the other reference numerals is basically the same as that of FIG. 1, and a description thereof will be omitted.

Next, as a matter common to both FIGS. 1 and 2, the ROM 3a (or 13) in the monitor 3 (or 13) is used.
a) or the ROM 2c4 (or 12
The data writing method of C4) may be an EDID method that defines a method of writing information. By unifying the writing method, the personal computer 1 (or 11) can output video even when another monitor is connected to the AV selector 2 (or 12). Further, A from the monitor unit 3 (or 13)
The data reading of the V selector 2 (or 12) or the data reading of the personal computer 1 (or 11) from the AV selector 2 (or 12) may be performed via a communication line conforming to the DDC standard. Thereby, the ROM 3a (or 13a) or the RO
Data reading of M2c4 (or 12C4) can be automatically performed.

[0018]

As described above, according to the present invention, when the video output of the personal computer is sent to the monitor unit via the AV selector and displayed, the personal computer surely outputs the video signal suitable for the monitor unit. It will be able to output.

[Brief description of the drawings]

FIG. 1 is a main block diagram showing one embodiment of a video display system according to the present invention.

FIG. 2 is a main block diagram showing another embodiment of the video display system according to the present invention.

FIG. 3 is an explanatory diagram of data replacement.

FIG. 4 is a main block diagram showing an example of a conventional video display system.

[Explanation of symbols]

 1, 11 Personal computer 1a, 11a Reading means 1b, 11b Video signal generating means 2, 12 AV selector 2a, 12a Switching unit 2b A / D converter 2c, 12c Data replacing means 2c1, 12c1 First memory unit 2c2, 12c2 Second memory unit 2c3, 12c3 Replacement unit 2c4, 12c4 ROM 2c5, 12c5 Control unit 3, 13 Monitor unit 3a, 13a ROM 4, 5, 14, 15 Signal line 6, 7, 16, 17 Communication line 12b D / A Conversion unit 21 Personal computer 21a Reading unit 21b Video signal generation unit 22 AV selector 23 Monitor unit 23a ROM 24, 25, 26 Communication line 27, 28 Signal line

Claims (6)

[Claims] 1. A monitor unit having a ROM which receives a digital video signal and displays the input video signal, and which stores in advance data indicating conditions of the input video signal together with data specifying itself. A switching unit for switching and selecting a required one from a plurality of analog input video signals; and an A / D conversion unit for converting an analog video signal from the switching unit into a digital video signal and outputting the digital video signal to the monitor unit. And an AV selector comprising data replacement means for reading data from the ROM of the monitor unit and replacing and storing the read data, and reading data stored in the data replacement means of the AV selector. A personal computer for outputting an analog video signal suitable for the read data to a switching section of the AV selector. Characteristic video display system. 2. An analog video signal is input, and the input video signal is displayed. On the other hand, data indicating conditions of the input video signal is stored in advance together with data specifying itself.
A monitor unit having an OM, a switching unit for switching and selecting a required one from a plurality of analog input video signals, and converting the digital video signal from the switching unit into an analog video signal; An AV selector comprising: a D / A converter for outputting data to the ROM; data replacement means for reading data from the ROM of the monitor unit; and replacing and storing the read data; and a data replacement means for the AV selector. A video display system comprising: a personal computer which reads stored data and outputs a digital video signal adapted to the read data to a switching unit of the AV selector. 3. A data replacement means, comprising: a first memory unit preliminarily storing data specifying an AV selector;
A second memory unit that stores data read from the ROM of the monitor unit, and a second memory unit that stores data read from the first memory unit.
A replacement unit for replacing data as data held by the AV selector from data in the memory unit, a ROM storing the data replaced by the replacement unit, the first memory unit, the second memory unit, the replacement unit, and the ROM 3. The video display system according to claim 1, wherein the video display system comprises a control unit for controlling the image display. 4. The personal computer according to claim 1, wherein
2. The data read from the data replacement means of the selector is data of a resolution and data of an output form of a video signal of an analog or digital type.
Or the video display system according to claim 2. 5. The method according to claim 1, wherein a method of writing data to the ROM in the monitor unit or the ROM in the data replacement unit is an Extended Display Identification Data (EDID) method. The video display system as described. 6. Reading data of an AV selector from the monitor section or reading data of a personal computer from the AV selector by a DDC (Display Data Chan- nel).
The image display system according to any one of claims 1 to 3, wherein the image display is performed via a communication line conforming to a (nel) standard.