JP2002152633A - Projection display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform image quality adjustment and display setting in the case of overlapping and horizontally arranging projected images on the screen by using a plurality of projection display devices. SOLUTION: The subsequent stages of a digital signal processing circuit are provided with a selector 26 for selecting a signal path, an input connector 27 and an output connector 28 of a digital interface standard in the case of necessity when the projection display device 1, etc., are constructed, either digital video data D3 subjected to signal processing by the digital signal processing circuit 23 or digital video data D5 inputted from the outside via the connector 27 can be selected to be projected, and the selected digital video data can be outputted to the outside from the connector 28. Thus, the same projected images can be obtained from the whole display devices by connecting a plurality of proper types of display devices and applying digital signal processing such as image quality adjustment and display setting to one display device of the display devices.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection display apparatus for obtaining the same projection image on a screen by using a plurality of projectors.

[0002]

2. Description of the Related Art In recent years, as multimedia related equipment,
Digital image and video devices such as digital still cameras, DVDs, and LCD projectors are rapidly becoming widespread.
Among them, for a projection display device such as an LCD projector capable of viewing an image such as a television or a video on a large screen, a method of obtaining the same projection image on a single screen by using a plurality of devices is known. Japanese Patent Application Laid-Open No. Hei 5-1077639 discloses a stack projection method in which a plurality of projection display devices are used to superimpose respective projection images on a screen to obtain a bright projection image.

FIG. 8 shows the configuration and data processing of a conventional projection display device. The projection display device 21 includes an A / D converter 22, a digital signal processing circuit 23, a D / A converter 24, and a display device 25. Then, the analog video data D1 from the input source Sa is sampled and quantized by the A / D converter 22, output as digital video data D2, and the digital signal processing circuit 23 converts the resolution.
Performs digital signal processing such as image quality adjustment and display setting on the basis of the adjustment value data input in advance, and D / A converts the digital signal processed video data D3 by the D / A converter 24 and displays it as analog image data D4 The data is output to the device 25 and projected.

FIG. 9 shows a projection type display device 2 as described above.
A state in which four projectors 1 are arranged in the upper and lower stages facing each other in the vertical direction (vertical direction) to shift the projection lens so that the same projection image overlaps on the screen Sc to realize stack projection. Is shown. Here, the projection lens of each projection display device 21 is movable in the vertical direction along the screen Sc. In this case, since the projection image Im on the screen Sc is obtained by superimposing the light outputs from the four projection display devices 21, the projection image Im becomes four times brighter than the projection image from any one of them, and can be viewed even in a bright room. be able to.

In FIG. 10, two projection display devices 21 as described above are arranged at an interval along the horizontal direction so as to face the screen Sc in the vertical direction, and the same projection images Im are arranged side by side on the screen Sc. FIG. This projection method can solve the problem that the number of spectators who cannot be seen only by having one projection image on a screen in a large hall or the like increases.

[0006]

By the way, the conventional projection type display device only externally outputs analog video data input from an input source as described above.
Transmits image data that has been subjected to various image quality adjustments such as horizontal and vertical positions, display pixel phase adjustment, display image black level, brightness, contrast, and γ correction to another projection display device. No function.

Therefore, when a bright projection image is obtained as shown in FIG. 9 or when a plurality of projection images are obtained as shown in FIG. 10, the same projection image is obtained by each projection display device used. So that for all projection display devices,
Operation such as returning to the initial state at the time of shipment, or the same adjustment must be performed. The same video signal and the same projected image can be obtained with all projection display devices by returning to the initial state at the time of shipment, but the image quality desired by the user may not be obtained. In many cases, the same image quality adjustment value must be set.

When the adjusted analog video data is to be input to another projection type display device, the A / D converter 22 and the digital signal processing circuit 23 perform A / D conversion again in the device configuration shown in FIG. And image quality adjustment, etc., so that the two projection display devices project different images. Especially, in the digital signal processing circuit 23, γ
When the image passes through the correction circuit, the brightness of the image is different even with the same adjustment value. It is conceivable that the adjusted analog video data is directly input to the display device 25. However, this case is not preferable because image quality degradation during signal communication and timing control of a synchronization signal occur.

For these reasons, functions such as horizontal and vertical positions, display pixel phase adjustment, horizontal size, zoom, etc., and the black level of the displayed image are set for all the projection display devices to be used. At present, many image quality such as brightness, contrast, gamma correction, and display settings are unified, which is troublesome.

[0010] Therefore, when overlaying or arranging projected images on a screen using a plurality of projection display devices, it is an object to easily adjust image quality and display settings.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, when a projection type display device is configured, a digital signal processing unit in which image quality and display settings are not further changed is provided. Selector for selecting signal path, DV
By adding a connector of digital interface standard such as I and DFP, it is possible to determine which digital video signal is projected out of the signal processed by the digital signal processor and the signal input from outside through the connector. The digital video signal can be selected and output to the outside. As a result, the same projection image can be obtained from all display devices by connecting a plurality of display devices of an appropriate type to one of them and performing digital signal processing such as image quality adjustment and display setting for one of them. Becomes possible.

[0012]

According to the present invention, there is provided a projection display apparatus for projecting an input video signal into an image on a display device and projecting the image on an external screen. Digital signal processing means for performing signal processing such as image quality adjustment and display setting on an input video signal, a digital signal input section for inputting an external digital video signal, and a digital signal output section for externally outputting an internal digital video signal And a digital video signal which is connected to the output side of the digital signal processing means and the digital signal input section and the input side of the display device and the digital signal output section, and is output from either the digital signal processing means or the digital signal input section. And a selector capable of selecting an arbitrary signal path for inputting the signal to at least one of the display device and the digital signal output unit. It is obtained by the a configuration.

Thus, when a plurality of projection images of the same type are obtained on the screen, a plurality of the projection display devices are used, and one of them is subjected to signal processing such as image quality adjustment and display setting. By simply transmitting the video signal after signal processing to all the remaining projection display devices, it is possible to obtain a projection image equivalent in image quality and display, and to unify image quality adjustment and display settings. No need.

According to a second aspect of the present invention, there is provided a projection display apparatus for converting an input video signal into an image on a display device and projecting the image on an external screen. A digital signal processing unit for performing signal processing such as image quality adjustment and display setting, and a digital signal output unit connected to an output side of the digital signal processing unit and externally outputting a signal-processed digital video signal; It is what it was.

Thus, when obtaining a plurality of projection images of the same kind on a screen, the projection type display device and the projection type display device according to claim 1 having the digital signal input section are used. Then, the video signal after the signal processing in the above-mentioned projection display device is used as basic video data, and is transmitted and input to all the remaining projection display devices, so that the image quality, display, etc. are obtained by all the projection display devices. Equivalent projection images can be obtained, and it is not necessary to unify image quality adjustments and display settings.

According to a third aspect of the present invention, there is provided a projection display apparatus for converting an input video signal into an image on a display device and projecting the image on an external screen. A digital signal processing unit for performing signal processing such as image quality adjustment and display setting, a digital signal input unit to which an external digital video signal is input, an output side of the digital signal processing unit and the digital signal input unit, and a display device. A selector connected to the input side, and having a selector capable of selecting an arbitrary signal path for inputting a digital video signal output from one of the digital signal processing means and the digital signal input unit to the display device. is there.

According to the present invention, there is provided the projection display device wherein a signal path passing through a digital signal input section is selected when a plurality of and the same type of projected images are obtained on a screen, and a digital signal output section. A video signal after signal processing in the projection display device having the digital signal output unit is used as basic video data by using the projection display device according to claim 2, and the total number of the projection display devices is , It is possible to obtain a projection image having the same image quality and display, and it is not necessary to unify all image quality adjustments and display settings.

According to a fourth aspect of the present invention, there is provided a projection display apparatus for converting an input video signal into an image on a display device and projecting the image on an external screen. And a digital signal output unit connected to the output side of the digital signal input unit on the input side and externally outputting a digital video signal.

According to the present invention, when a plurality and the same kind of projection images are obtained on a screen, the projection type display device and the digital signal output section are provided. Using a device, the video signal after signal processing in the projection display device having the digital signal output unit as the basic video data, by transmitting and input to all the projection display device, image quality, display It is possible to obtain a projection image equivalent to the above, and it is not necessary to unify all image quality adjustments and display settings.

According to a fifth aspect of the present invention, there is provided a projection display apparatus for converting an input video signal into an image on a display device and projecting the image on an external screen. Is provided with a digital signal input section for inputting.

According to the present invention, when a plurality of projection images of the same type are obtained on a screen, the projection display device and the digital signal output unit are provided. Using a device, the video signal after signal processing in the projection display device having the digital signal output unit as the basic video data, by transmitting and input to all the projection display device, image quality, display It is possible to obtain a projection image equivalent to the above, and it is not necessary to unify all image quality adjustments and display settings.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is a block diagram showing a schematic configuration of a projection display apparatus according to Embodiment 1 of the present invention. Since this projection display device has basically the same configuration as the conventional projection display device 21 described above with reference to FIG. 8, members, signals (data) having the same functions as those of the conventional projection display device 21 are provided. ) Will be described with the same reference numerals as in FIG.

In the projection display device 1, a digital signal processing circuit 23 is connected to an output side of an A / D converter 22 connected to an input source (not shown), and a D / A converter 24 and a display device are provided at a subsequent stage. 25 are connected in series.

The projection display device 1 is different from the conventional display device in that a selector 26 for selecting a signal path is interposed between a digital signal processing circuit 23 and a D / A converter 24. The point is that the input connector 27 and the output connector 28 of the digital interface standard are connected to the input side and the output side, respectively.

More specifically, the A / D converter 22 converts the analog video data D1 into a digital signal by sampling and quantizing the analog video data D1 at the cycle of a sampling clock.
The digital signal processing circuit 23 includes a frame memory, a selector, a register, and the like.
2, the compression / expansion in each horizontal scan, the compression / expansion in the vertical direction, the change of the display position on the display device 25, and the adjustment value input from the outside. Image quality adjustment such as brightness adjustment of display image, contrast adjustment, gamma correction, etc.
Performs signal processing such as a zoom function.

The D / A converter 24 converts digital video data D2 and D5 input from the digital signal processing circuit 23 or the input connector 27 into analog image data D3.
Is converted to

The display device 25 has a pixel structure.
Analog image data D4 input from the A converter 24
Is displayed as an image, and the image is projected on a screen through a lens (not shown).

The selector 26 selects which one of the digital video data D3 output from the digital signal processing unit 3 and the digital video data D5 externally transmitted and input via the input connector 27 is to be projected. , D / A converter 24 and at least one of output connectors 8.

The input connector 27 and the output connector 28 are connectors of a digital interface standard such as DVI, DFP, etc., for inputting digital video data D5 transmitted from outside of the device into the device, and for inputting digital video data in the device. Used to transmit D3 and D5 outside the device.

These members and signals are denoted by the same reference numerals in the following embodiments, and detailed description is omitted. (Embodiment 2) FIG. 2 is a block diagram showing a schematic configuration of a projection display according to Embodiment 2 of the present invention.

In the projection display device 2, a digital signal processing circuit 23 is connected to an output side of an A / D converter 22, and a D / A converter 24 and a display device 25 are connected in series at a subsequent stage. . An output connector 28 is connected to the output side of the digital signal processing circuit 23. (Embodiment 3) FIG. 3 is a block diagram showing a schematic configuration of a projection display apparatus according to Embodiment 3 of the present invention.

In the projection display device 3, a digital signal processing circuit 23 is connected to the output side of the A / D converter 22, and a D / A converter 24 and a display device 25 are connected in series at the subsequent stage. . A selector 26 is interposed between the digital signal processing circuit 23 and the D / A converter 24. The input connector 2 is connected to the input side of the selector 26.
7 is connected. (Embodiment 4) FIG. 4 is a block diagram showing a schematic configuration of a projection display apparatus according to Embodiment 4 of the present invention.

In the projection display device 4, a D / A converter 24 and a display device 25 are connected in series to the output side of an input connector 27, and an output connector 28
Is connected. (Embodiment 5) FIG. 5 is a block diagram showing a schematic configuration of a projection display apparatus according to Embodiment 5 of the present invention.

In the projection display device 5, a D / A converter 24 and a display device 25 are connected in series on the output side of the input connector 27. FIGS. 6 and 7 show the projection type display device as described above in the vertical screen S.
A description will be given of a method of stacking and projecting four projection images Im of the same type so as to be overlapped on the screen Sc, by arranging four units in the upper and lower stages so as to face each other.

In the method shown in FIG. 6, video data output from an input source Sa such as a video or a personal computer is sequentially transmitted to the projection display devices 11, 12, 13, and 14.

The projection display device 11 performs digital signal processing such as image quality adjustment and display setting based on adjustment values on the analog video data input from the input source Sc, and displays an image to form a projection image. , And externally outputs digital video data subjected to digital signal processing. Therefore, the above-described digital signal processing circuit 23 and output connector 28 are essential, and the projection display devices 1 and 2 described with reference to FIG. 1 or FIG. 2 can be used.

The projection display devices 12 and 13 form and input a projection image equivalent to that of the projection display device 11 by transmitting and inputting digital video data output from the projection display device 11 at the preceding stage. The digital video data is externally output. Therefore, the input connector 27 and the output connector 28 described above are indispensable.
Alternatively, the projection display devices 1 and 4 described with reference to FIG. 4 can be used.

The projection display device 14 forms a projection image equivalent to that of the projection display device 11 by transmitting and inputting digital video data output from the projection display device 13 at the preceding stage. Therefore, the above-described input connector 27 is indispensable, and the projection display devices 1, 3, 4, and 5 described with reference to FIGS. 1, 3, 4, or 5 can be used.

In the method shown in FIG. 7, video data output from an input source Sa such as a video or a personal computer is fetched into the projection display device 15, and the projection display devices 16, 17, and 18 are transmitted from the projection display device 15. To each of them.

The projection display device 15 performs digital signal processing such as image quality adjustment and display setting based on adjustment values on the analog video data input from the input source Sc, and displays an image to form a projection image. , For externally outputting digital video data subjected to digital signal processing. Therefore, the above-described digital signal processing circuit 2
3. The output connector 28 is indispensable, and the projection display devices 1 and 2 described with reference to FIG. 1 or FIG. 2 can be used.

The projection display devices 16, 17, and 18 form a projection image equivalent to that of the projection display device 15 by transmitting and inputting digital video data output from the projection display device 15. Therefore, the above-described input connector 27 is indispensable, and the projection display devices 1, 3, 4, and 4 described above with reference to FIG. 1, FIG. 3, FIG. 4, or FIG.
5 can be used.

In this way, by selecting and combining an appropriate type of projection display device depending on whether signal processing, transmission input, or external output is required, one of them can be used as a signal source. Just by performing the processing, it is possible to obtain the same projected image from all the devices, to facilitate the operation, to simplify the circuit configuration, and to reduce the cost.

When a plurality of projection images of the same type are arranged side by side, an equivalent projection image can be obtained from all the projection type display devices in the same manner.

[0044]

As described above, according to the present invention, in configuring a projection display apparatus using a plurality of projection images for superposing or lining up a plurality of projection images of the same type, a projection type display for connecting to an input source. The display device is provided with digital signal processing means for performing signal processing such as image quality adjustment and display setting on the input video signal, and all projection display devices including the projection display device transmit video data to the inside and outside. A means for inputting and outputting digital data is provided. This allows
Signal processing such as image quality adjustment and display setting is performed on one device, and a video signal after signal processing is simply transmitted and input to the remaining devices, thereby obtaining a projected image equivalent in image quality, display, etc. in all devices. This makes it possible to simplify the circuit configuration and reduce the cost.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic overall configuration of a projection display apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a block diagram showing a schematic overall configuration of a projection display apparatus according to Embodiment 2 of the present invention.

FIG. 3 is a block diagram showing a schematic overall configuration of a projection display apparatus according to Embodiment 3 of the present invention.

FIG. 4 is a block diagram showing a schematic overall configuration of a projection display according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a schematic overall configuration of a projection display apparatus according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram showing a state in which four projection display apparatuses shown in FIGS. 1 to 5 are connected in series to perform stack projection.

FIG. 7 is a configuration diagram showing a state in which four projection display apparatuses shown in FIGS. 1 to 5 are connected in parallel to perform stack projection.

FIG. 8 is a block diagram showing a schematic overall configuration of a conventional projection display device.

9 is a configuration diagram showing a state where stack projection is performed using four projection display devices of FIG. 7;

10 is a configuration diagram showing a state in which the same projection image is obtained side by side using two projection display devices of FIG. 7;

[Explanation of symbols]

 1, 2, 3, 4, 5 Projection display device 22 A / D converter 23 Digital signal processing circuit 24 D / A converter 25 Display device 26 Selector 27 Input connector 28 Output connector 11, 12, 13, 14 Projection display device 15, 16, 17, 18 Projection display device Sa input source Sc screen

Claims (5)

[Claims] 1. A projection display apparatus for converting an input video signal into an image on a display device and projecting the image on an external screen, wherein image quality adjustment and display setting are performed on the digitized input video signal which is arranged in front of the display device. Digital signal processing means for performing signal processing such as: a digital signal input section to which an external digital video signal is input; a digital signal output section to externally output an internal digital video signal; and the digital signal processing means and digital signal input A digital video signal output from one of the digital signal processing means and the digital signal input unit connected to the output side of the unit and the input side of the display device and the digital signal output unit, and at least one of the display device and the digital signal output unit And a selector capable of selecting an arbitrary signal path to be input to the projector. Display device. 2. A projection display device for converting an input video signal into an image on a display device and projecting the image on an external screen, wherein image quality adjustment and display setting are performed on the digitized input video signal which is arranged in front of the display device. A digital signal processing means for performing signal processing such as the above, and a digital signal output unit connected to the output side of the digital signal processing means for externally outputting a digital video signal subjected to signal processing. apparatus. 3. A projection-type display device for converting an input video signal into an image on a display device and projecting the image on an external screen, wherein image quality adjustment and display setting are performed on the digitized input video signal which is disposed in front of the display device. Digital signal processing means for performing signal processing such as, a digital signal input section to which an external digital video signal is input, connected to the output side of the digital signal processing means and the digital signal input section and the input side of the display device, A projection display device comprising: a selector capable of selecting an arbitrary signal path for inputting a digital video signal output from one of a digital signal processing unit and a digital signal input unit to a display device. 4. A projection type display device for converting an input video signal into an image on a display device and projecting the image on an external screen, wherein the digital signal input section is connected to an input side of the display device on an output side and receives an external digital video signal. And a digital signal output unit connected to an output side of the digital signal input unit on an input side and externally outputting a digital video signal. 5. A projection type display device for converting an input video signal into an image on a display device and projecting the image on an external screen, wherein the digital signal input section is connected to an input side of the display device on an output side and receives an external digital video signal. A projection display device comprising: