JP2011205419A - Video display device and video display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video display device in which, when a two-screen display instruction is inputted, an input terminal to which a video signal is inputted is automatically selected and displayed on two screens.SOLUTION: When an operation for starting the two-screen display is performed by a remote control 54, a control portion 66 makes an input selector 56a and an input selector 56b sequentially select input terminals T1-T6. Moreover, the control portion 66 makes an identification portion 57a and an identification portion 57b identify whether the video signal is inputted or not for each switched input terminal. In the case that the signal is inputted to the input terminal, the control portion 66 makes the display portion display a video corresponding to the selected input terminal. The video source selection method is applied at least to one side among the two screens for the display of two screens on one display device.

Description

  The present invention relates to a video display device and a video display method.

  In a conventional video display device such as a projector, two video sources are selected from a plurality of video sources (personal computer (PC), DVD, VTR, other video equipment, the Internet, etc.) and two screens are displayed on one display device. There is something that can be displayed.

  In such a video display device, when a two-screen display start command is input by a mode switch or a remote controller, a list of video sources is displayed by the OSD. By selecting a video source to be displayed on the two screens from the list, it is possible to display two screens with any video source.

In addition, instead of displaying a list of video sources in the OSD, a specific video source is forcibly selected. Thereby, the trouble of selecting a video source can be omitted, and two-screen display can be started promptly.
Patent Document 1 discloses a display device that automatically switches between one-screen display and two-screen display in accordance with the presence / absence of image signals from two signal sources.

JP 2001-346121 A

However, the conventional video display device corresponding to the two-screen display has a problem that the two-screen display cannot be performed with the combination of the intended video sources simply by inputting the two-screen display start command.
For example, in the case of a video display device in which a list of video sources is displayed by OSD, a video source to be displayed must be selected after inputting a two-screen display start command.
In addition, in the case of a video display device in which a specific video source is forcibly selected at the start of the two-screen display, if the displayed video source is not intended, an operation for switching the video source must be performed. Don't be.

  On the other hand, in the display device disclosed in Patent Document 1, a technique for automatically switching between single-screen display and dual-screen display without giving a switching signal from the outside is shown. The screen is switched based on the presence or absence of the synchronization signal of the video signal from the system, and the intended video source combination is not automatically selected when the two-screen display start command is input.

  Furthermore, the above-described problem is the same for a video display device that can display three or more screens on one display device.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A video display device according to this application example is a video display device that displays a video represented by a video signal on a display unit, and the video signals supplied from a plurality of video sources are A plurality of input terminals for inputting each video signal, an input selector for selecting the desired input terminal from the plurality of input terminals, and whether or not the video signal is input to the selected input terminal An identification unit for identifying the video signal, a video signal processing unit for performing a multi-image synthesis process for synthesizing the video signal input from at least two input terminals selected by the input selector into one image, and the multi-image synthesis An operation unit that receives an operation for starting and ending the process, and when the operation unit starts an operation for starting the multiple image composition process, the input selector A plurality of input terminals are selected in a predetermined order, the identification unit identifies whether or not the video signal is input to the selected input terminal, and the input unit from which the input of the video signal is confirmed by the identification unit An image based on a video signal is displayed on the display unit as one of the composite images.

  According to this application example, when an operation for starting a two-screen display is received, whether or not a video signal is input is identified for each input terminal, and the input terminal to which the video signal is input is given priority. Select and display two screens. Thus, simply by inputting a two-screen display start command, an input terminal to which a video signal is input can be reliably selected, and two-screen display can be performed with a combination of intended video sources.

  Application Example 2 In the video display device according to the application example described above, the video display device further includes a storage unit that stores an input terminal selected when the multi-image synthesis process is finished, and the input selector includes the operation unit When the operation for starting the multi-image composition processing is performed, the input terminal stored in the storage unit is preferentially selected.

  According to this application example, when the operation for starting the two-screen display is accepted, the input terminal selected when the two-screen display is finished is selected from among the input terminals to which the video signal is input. have priority. As a result, it is possible to quickly reproduce the previous usage status by simply inputting a two-screen display start command.

  Application Example 3 In the video display device according to the application example described above, the video display device further includes determination means for determining whether or not two screens can be displayed for a combination of at least two input terminals, and the input selector selects the plurality of input terminals. When the selection means determines whether or not multiple screen display is possible for the combination with the input terminal selected on another screen, the input selector selects the input terminal capable of multiple screen display. It is characterized by doing.

  According to this application example, when an operation for starting a two-screen display is accepted, the presence / absence of signal input is identified only for input terminals capable of two-screen projection in consideration of a combination of input terminals. . As a result, the time until the video source to be displayed is selected is shortened, and two-screen display can be quickly performed.

  Application Example 4 A video display method according to this application example is a video display method for displaying a video represented by a video signal, and a plurality of video signals supplied from a plurality of video sources are input. Select input terminals in a predetermined order, identify whether the video signal is input to the selected input terminal, and input from the at least two input terminals for which input of the video signal has been confirmed. In addition, the video based on the video signal is synthesized and displayed as one image.

  When an operation for starting the two-screen display is accepted, it is identified whether or not a video signal is input for each input terminal, and the input terminal to which the video signal is input is preferentially selected and the two-screen display is performed. . Thus, simply by inputting a two-screen display start command, an input terminal to which a video signal is input can be reliably selected, and two-screen display can be performed with a combination of intended video sources.

1 is a schematic configuration diagram of a projector according to a first embodiment. The figure which shows an example of the display screen in 1st Embodiment. The flowchart which showed the video source selection method of 1st Embodiment. The figure which shows the selection order of the input terminal in 1st Embodiment. The figure which shows an example of the display screen in 1st Embodiment. The figure which shows an example of the display screen in 1st Embodiment. The schematic block diagram of the projector of 3rd Embodiment. The table | surface which shows the combination of the video source which can be selected in 3rd Embodiment. The figure which shows the selection order of the input terminal in 3rd Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(First embodiment)
<Projector configuration>
FIG. 1 is a block diagram showing a schematic configuration of a projector as a video display apparatus according to the first embodiment of the present invention. Hereinafter, a schematic configuration of the projector 100 will be described with reference to FIG.
The projector 100 separates the white light emitted by the lamp 51 as the light source into three primary color components of red light, blue light, and green light, and a liquid crystal light valve 52R for each color light as a display unit for each color light. , 52G, and 52B, a so-called “liquid crystal three-plate projector” that projects the full-color modulated light, which is modulated again according to the video signal supplied from the video source and projected onto the screen SC by the projection lens 65.
The liquid crystal light valves 52R, 52G, and 52B are light modulation elements, which are provided for red light, green light, and blue light, respectively, and are included in the configuration of the optical unit 64.

The projector 100 includes a lamp 51, an operation unit 53, a remote controller 54, an operation reception unit 55, input terminals T1 to T6, input selectors 56a and 56b, identification units 57a and 57b, video converters 58a and 58b, a video signal processing unit 59, a frame. A memory 60, a video signal correction unit 61, an OSD memory 62, a liquid crystal panel driving unit 63, an optical unit 64, a projection lens 65, a control unit 66, a storage unit 67, a power supply unit 68, a lamp driving unit 69, and the like.
The lamp 51 is, for example, a discharge lamp capable of obtaining high brightness such as a high-pressure mercury lamp, a metal halide lamp, or a halogen lamp.

The operation unit 53 is provided on the upper surface of the main body of the projector 100 and includes a plurality of operation buttons for operating the projector 100. For a plurality of operation buttons, a “power button” for starting and shutting down the projector 100, a “video search button” for searching for a video source supplying a video signal, and a desired video source are selected. For example, a “source selection button” (not shown) for each video source is included.
A remote control 54 as an operation unit is a remote control for remotely operating the projector 100, and includes a plurality of operation buttons for operating the projector 100 similar to the operation unit 53. The plurality of operation buttons also include “two-screen setting buttons” for starting and ending two-screen display.
When an operation is performed on the operation unit 53 or the remote controller 54, the operation reception unit 55 receives the operation and sends an operation signal serving as a trigger for various operations to the control unit 66.

Input terminals T1 to T6 are video signals supplied from personal computers PC1, PC2, PC3, digital player DV, video player VI, and Blu-ray Disc player BD, which are external electronic devices as a plurality of video sources. This is an input terminal for inputting to the projector 100 for each signal.
The input terminals T1 and T2 are mini D-sub 15-pin terminals, for example, and correspond to analog RGB signals supplied from the personal computers PC1 and PC2. In addition, component signals can also be input by changing the usage assignment of the 15-pin signal line of the mini D-sub 15-pin terminal.
The input terminal T3 is, for example, a DVI-D terminal and corresponds to a digital RGB signal supplied from the personal computer PC3.
The input terminal T4 is, for example, an S terminal and corresponds to an S signal supplied from a DVD player DV, an S video player, or the like.
The input terminal T5 is, for example, a 1RCA terminal and corresponds to a composite signal supplied from a video player VI, a TV tuner, or the like.
The input terminal T6 is, for example, an HDMI terminal and corresponds to a digital RGB signal or a digital component signal supplied from a Blu-ray disc player BD, a DVD player DV, or the like.
As an input terminal of the projector 100, in addition to the video input terminal described above, for example, an audio input terminal such as a stereo mini jack for inputting an audio signal, or various kinds of signals between an external personal computer and the projector 100 can be used. Although a USB terminal, an RS232C terminal, and the like for exchanging information are provided, illustration is omitted for the sake of simplicity.

Hereinafter, the personal computers PC1, PC2, and PC3, the digital player DV, the video player VI, and the Blu-ray disc player BD, which are external electronic devices, will be described with the expression of the video source name.
Specifically, the personal computers PC1 and PC2 are expressed as “Computer1” and “Computer2” in the video source name. Similarly, the personal computer PC3 is expressed as “DVI-D”, the DVD player DV as “S-Video”, the video player VI as “Video”, and the Blu-ray disc player BD as “HDMI”.
The input selector 56a is a selection switch for the input terminals T1 to T6, and selects any one of the six input terminals T1 to T6 according to a selection signal from the control unit 66. Thereby, when the video source corresponding to the selected input terminal supplies the video signal Vin, the projector 100 projects an image based on the video signal Vin.
The default video source at the shipment stage of the projector 100 is “Computer1”. For example, when the “video search button” of the remote controller 54 is operated after the projector 100 is activated, the input selector 56a sequentially selects the input terminals T1 to T6, thereby selecting video sources “Computer1” and “Computer2”. , “DVI-D”, “S-Video”, “Video”, “HDMI” in this order.
When the projector 100 is shut down, the video source information selected at the time of shutdown is stored in the storage unit 67 and reproduced at the next startup.

The identification unit 57a is, for example, a comparator, and confirms whether or not the video signal Vin is supplied from the video source selected by the input selector 56a, and whether or not there is a synchronization signal included in the video signal Vin. As a result, an identification signal is transmitted to the controller 66 that identifies and informs the presence / absence of input of the video signal Vin.
The video converter 58a A / D converts the analog video signal Vin and outputs it as a digital video signal Din. This is performed in order to perform various video signal processing on the video signal Vin. It also has a built-in decoder.
Specifically, when the video signal Vin is an analog RGB signal of the video sources “Computer 1” and “Computer 2”, the video converter 58a performs video signal processing including A / D conversion processing as it is. When the video signal Vin is an S signal of the video source “S-Video” or a composite signal of “Video”, the built-in decoder performs video signal processing including A / D conversion processing after conversion to a component signal. . In the case of digital signals of the video sources “DVI-D” and “HDMI”, A / D conversion processing is not performed.

  The input selector 56b, the identification unit 57b, and the video converter 58b have the same roles as the input selector 56a, the identification unit 57a, and the video converter 58a, respectively, and perform both processes independently when performing two-screen display. When the “two-screen setting button” of the remote controller 54 is operated, the input selector 56b selects a video source different from the video source selected by the input selector 56a or the same video source from the input terminals T1 to T6. The identification unit 57b identifies the presence or absence of a signal from the video source selected by the input selector 56b, and the video converter 58b performs various video signal processing on the video signal Vin.

  The video signal processing unit 59 writes video data to the frame memory 60 and reads the video signal Din under a predetermined condition so that the video signal Din is a signal suitable for display by the liquid crystal light valves 52R, 52G, and 52B. Perform signal processing. For video signal processing, scaling processing that matches the resolution of the liquid crystal light valves 52R, 52G, and 52B by enlarging and reducing the video represented by the video signal Din, frame rate conversion that indicates the number of drawing updates per second, etc. Is included. The video signal Din is subjected to such video signal processing and is output as a digital video signal Dsc.

  The video signal correction unit 61 converts the gradation value of the video signal Dsc into a gradation value suitable for display on the liquid crystal light valves 52R, 52G, and 52B, and the liquid crystal light valves 52R, 52G, and 52B. An analog video signal Vout subjected to color unevenness correction processing due to inherent brightness unevenness and further subjected to D / A conversion is output.

In addition, the video signal correction unit 61 manages an OSD (On-Screen Display) function that superimposes the video source name on the video represented by the video signal Vin, for example. In accordance with the OSD signal from the control unit 66, the video signal correction unit 61 reads, for example, “video source name” and “search screen” of the video source from the OSD memory 62 and superimposes them on the video signal Dsc.
When the video signal Vin is not input, the video signal correction unit 61 displays, for example, a “standby screen” in which characters “Video source name” and “Video signal is not input” are displayed on a blue solid screen. "Is read from the OSD memory 62, and a video signal Vout representing" standby screen "is generated and output.
The OSD memory 62 is a non-volatile memory, such as a “video source name”, various aspects of the “search screen” of the video source, a “standby screen”, and other screens indicating various operating states of the projector 100 used for the OSD. The character pattern etc. are memorized.

The liquid crystal panel driving unit 63 is a liquid crystal driver and supplies the liquid crystal light valves 52R, 52G, and 52B with a video signal Vout, a driving voltage, and the like, and displays the images on the liquid crystal light valves 52R, 52G, and 52B.
The optical unit 64 includes an integrator optical system that converts white light emitted from the lamp 51 into substantially parallel light having a stable luminance distribution, and red, green, and blue colors that are three primary colors of light. A separation optical system (none of which is shown) that separates the light components and supplies them to the liquid crystal light valves 52R, 52G, and 52B for each color light, and the liquid crystal light valves 52R, 52G, and 52B generates a video signal Vout for each color light A combined optical system that combines again the modulated light of each color light modulated accordingly.
The modulated light of each color light from the liquid crystal light valves 52R, 52G, and 52B includes a dichroic film 71 that reflects blue light and transmits green light, and a dichroic film 72 that reflects red light and transmits green light. It is synthesized by a cross dichroic prism 73 as an optical system, and is emitted as modulated light of substantially parallel light in a full color modulated in accordance with the video signal Vout.

The projection lens 65 is composed of a plurality of lenses such as a convex lens, and expands the modulated light from the cross dichroic prism 73 into projection light and projects an image on the screen SC. The projection lens 65 has a zoom function for adjusting the magnification of the projection light and a focus function for adjusting the focus of the projection light.
The control unit 66 is a CPU (Central Processing Unit), exchanges signals with each unit via the bus line Bus, and controls the operation of each unit in accordance with an operation signal from the operation accepting unit 55. .
The storage unit 67 is configured by a nonvolatile memory capable of rewriting data, such as a flash memory, for example. The storage unit 67 stores various control programs for instructing and controlling the operation of the projector 100, firmware, and accompanying data.
The control program includes a “video search program” as a search support program for searching for a video source that supplies a video signal. The accompanying data includes, for example, the name of the input terminal selected by the input selector before executing the “video search program”.

The power supply unit 68 is stabilized by guiding the AC power from the external power supply 80 from the plug and performing transformation, rectification, and smoothing in the built-in AC / DC conversion unit (both not shown). A DC voltage is supplied to each part of the projector 100.
The lamp driving unit 69 is supplied with power from the power supply unit 68 and generates a high voltage to turn on the lamp 51, which is a discharge lamp, to form a discharge path, and a stable lighting state after lighting. Is provided with a ballast circuit (none of which is shown).

<< First video source selection method >>
In the first embodiment, when a two-screen display start command is input, an image represented by input signals input from two different or the same image sources is simultaneously projected and displayed on one screen SC. .
FIG. 2 is a diagram illustrating an example of a screen layout during two-screen display. As shown in FIG. 2, two images are displayed, for example, in a side-by-side arrangement. Hereinafter, one screen is referred to as screen A, and the other screen is referred to as screen B.
FIG. 3 is a flowchart illustrating a video source selection method when a two-screen display start command is input according to the first embodiment.
FIG. 4 is a diagram illustrating a selection order when switching input terminals. 5 and 6 are diagrams illustrating an example of a display screen in the first embodiment.
Here, with reference to FIGS. 1, 2, and FIGS. 4 to 6, focusing on FIG. 3, an aspect of the video source selection method in the projector 100 will be described.

The video source selection method according to the first embodiment is a video source selection method performed when a two-screen display start command is input by the “two-screen setting button” of the remote controller 54 after the projector 100 is activated.
When the “two-screen setting button” of the remote controller 54 is operated, an operation signal is sent from the operation receiving unit 55 to the control unit 66. The control unit 66 that has received the operation signal causes the input selector 56a and the input selector 56b to select one of the input terminals T1 to T6 by the video source selection method according to the first embodiment, and displays the corresponding video signal. The projected image is projected as two screens. At this time, for example, when the video corresponding to the input terminal selected by the input selector 56a is displayed on the screen A, the video corresponding to the input terminal selected by the input selector 56b is displayed on the screen B.

The video source selection method according to the first embodiment is executed in steps as shown in FIG.
In step S11, the control unit 66 causes the input selector 56a to select an input terminal corresponding to the video source selected immediately before the two-screen display is started. Thereby, the image projected on the screen A becomes the same image as the image displayed immediately before the two-screen display is started.

A series of steps represented by step S20 is to select a video source of a video projected on the screen B, and includes steps S21 to S23.
In step S21, the control unit 66 causes the input terminal in the selection order next to the input terminal selected by the input selector 56b to be selected. At this time, when step S21 is executed for the first time after the video source selection process is started, the terminal next to the input terminal selected immediately before the two-screen display is started is selected as the input terminal. The selection order of the input terminals is as shown in FIG. For example, when the input terminal T2 is first selected, “input terminal T3” → “input terminal T4” → “input terminal T5” → “input terminal T6” → “input terminal T1” → “ It circulates as “input terminal T2”.

In step S22, the control unit 66 causes the identification unit 57b to check whether there is a video signal from the video source corresponding to the input terminal selected in step S21. If a video signal has been input, the process proceeds to step S31. If no video signal is input, the process proceeds to step S23.
In step S23, the control unit 66 confirms whether or not the video signal has been searched for all of the input terminals S1 to S6. When the search for all input terminals is completed, the process proceeds to step S31 with the input terminal selected by the input selector 56b selected immediately before the two-screen display is started. If there is an input terminal that has not been searched yet, the process returns to step S21.

In step S31, the control unit 66 projects an image on two screens based on the image signal input to the input terminal currently selected by the input selector 56a and the input selector 56b. For example, FIG. 5 shows a screen when the video source “Computer 1” is selected on the screen A and the video source “Computer 2” is selected on the screen B.
At this time, if no video signal is input to the input terminal currently selected by the input selector 56a and the input selector 56b, a message indicating no signal is displayed on the screen. For example, FIG. 6 shows a screen when the video source “Computer 1” is selected on the screen A, the video source “Computer 2” is selected on the screen B, and no signal is input to the video source “Computer 1”.

As described above, according to the present embodiment, the following effects can be obtained.
(1) When the two-screen setting button is operated by the remote controller 54, the control unit 66 displays a video represented by two different video sources or input signals input from the same two video sources. Display on two display devices simultaneously. At this time, as the video source selected on the screen A, the video source selected immediately before the two-screen display is started is taken over as it is, and the video is automatically displayed.
Therefore, when starting the two-screen display in the projector 100, the user can save the trouble of selecting the video source to be displayed on the screen A.

(2) When the two-screen display is started by the two-screen setting button operation of the remote controller 54, the control unit 66 displays the video based on the video signal from the input terminal on which the video signal input is confirmed on the screen B. Project with priority.
Therefore, when starting the two-screen display in the projector 100, the user can save the trouble of selecting the video source to be displayed on the screen B, and efficiently search for the video source outputting the video signal. Can do.

  As described above, the user simply inputs the two-screen display setting, and the input terminal to which the video signal is input is surely selected, and the two-screen display is performed with the intended combination of the video sources. Thereby, the projector 100 with good operability can be provided.

(Second Embodiment)
<< Second video source selection method >>
Similar to the first embodiment, the video source selection method according to the second embodiment is performed when a two-screen display start command is input by the “two-screen setting button” of the remote controller 54 after the projector 100 is activated. This is a video source selection method.
The configuration of the projector is the same as that of the projector 100 of the first embodiment shown in FIG. The video source selection method when a two-screen display start command is input according to the second embodiment is also represented by the flowchart shown in FIG. 3 as in the first embodiment. However, the contents of processing differ in some steps of FIG.
Here, only differences from the description in the first embodiment will be described with reference to FIGS. 1, 2, and 4 as appropriate, centering on FIG.

When the projector 100 is projecting two screens, when the “two screen setting button” operation is performed with the remote controller 54, the control unit 66 applies the video signal input from the input terminal selected by the input selector 56a. Only the video displayed is displayed on one screen. As a result, only the video displayed on the screen A at the time of the two-screen display remains, and the video displayed on the screen B is erased.
At this time, the control unit 66 causes the storage unit 67 to store the input terminal corresponding to the video source selected on the screen B immediately before the end of the two-screen display.

In step S21, the control unit 66 causes the input terminal in the selection order next to the input terminal selected by the input selector 56b to be selected. The selection order of the input terminals is as shown in FIG.
At this time, when step S21 is executed for the first time after the start of the video source selection process, the input selector 56b selects the input terminal selected at the end of the previous two-screen display stored in the storage unit 67. Let For example, if the input terminal selected at the end of the previous two-screen display is “input terminal T4”, regardless of the initial state of the input selector 56a, “input terminal T4” → “input terminal T5” → “ Selection is made in the order of “input terminal T6” → “input terminal T1” → “input terminal T2” → “input terminal T3”.

  The video source selection method according to the second embodiment is the same as that of the video source selection method according to the first embodiment except for the points described above.

As described above, according to the present embodiment, the following effects can be obtained in addition to the effects of the first embodiment.
(1) When the two-screen setting button is operated with the remote controller 54, the control unit 66 selects the screen B from the video source corresponding to the input terminal to which the video signal is input, particularly the last two screens. The video source selected on the screen B when the display is finished is preferentially selected, and the video is projected.
Therefore, in the projector 100, the user can promptly reproduce the previous use state only by inputting a two-screen display start command.

  (2) Further, since the storage unit 67 is a non-volatile memory, even when the power of the projector 100 is once turned off, the previous use state can be quickly reproduced in the same manner.

(Third embodiment)
<< 3rd video source selection method >>
FIG. 7 is a block diagram showing a part of a schematic configuration of a projector as a video display apparatus according to the third embodiment. The projector 200 is the same as the projector 100 of the first embodiment except that the input selector 156a and the input selector 156b are replaced with the input selector 56a and the input selector 56b of FIG. 1, respectively.
The input selector 156a is a selection switch for the input terminals T1, T2, T4, T5, and selects any one of the four input terminals T1, T2, T4, T5 in accordance with a selection signal from the control unit 66. . The input selector 156b is a selection switch for the input terminals T3 and T6, and selects one of them according to a selection signal from the control unit 66.
With these configurations, combinations of video sources that can be selected on screen A and screen B are limited when performing two-screen display. That is, when the video source that can be selected by the input selector 156a is selected as the video source of the screen A, the input terminals that can be selected as the video source of the screen B are the input terminals T3 and T6 that can be selected by the input selector 156b. Limited. The correspondence between the input selectors 156a and 156b and the screens A and B is not limited.
FIG. 8 is a table showing selectable video source combinations in the projector 200 of the third embodiment.
The selectable video source combinations are stored in advance in the storage unit 67 as data or programs.

The video source selection method when a two-screen display start command is input according to the third embodiment is represented by the flowchart shown in FIG. 3 as in the first embodiment. However, the contents of processing differ in some steps of FIG.
FIG. 9 is a diagram illustrating a selection order when switching input terminals.
Here, only differences from the description in the first embodiment will be described with reference to FIGS. 1, 2, 4, and 7 to 9 as appropriate centering on FIG. 3.

In step S21, the control unit 66 causes the input terminal in the selection order next to the input terminal selected by the input selector 156a to be selected. The selection order of the input terminals is as shown in FIG.
However, at this time, the “selectable video source combinations” are read from the storage unit 67, and for the video sources that cannot be selected simultaneously with the video source already selected on the screen A, the selection of the input terminal is skipped. For example, when the video source “Computer1” is selected on the screen A, the input source is selected in the order of “input terminal T3 (DVI-D)” → “input terminal T6 (HDMI)” as shown in FIG. .

  The video source selection method according to the third embodiment is the same as that of the video source selection method according to the first embodiment except for the points described above.

As described above, according to the present embodiment, the following effects can be obtained in addition to the effects of the first embodiment.
When the two-screen setting button operation is performed on the remote controller 54, the control unit 66 considers the combination of the two-screen video sources, and performs signal input only for an input terminal capable of two-screen projection on the screen B. Identify presence or absence.
Therefore, in the projector 200, the time until the video source to be displayed is selected is shortened, and two-screen display can be quickly performed.

  Note that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be added to the above-described embodiment. A modification will be described below.

(Modification 1)
This will be described with reference to FIG. In each of the above embodiments, the video source selection method represented in step S20 has been described as being performed only on the screen B. However, the present invention is not limited to this and can be applied to any screen.
That is, the method for selecting the screen A may be the method represented by step S20 as in the method for selecting the screen B in the embodiment. As a result, it is possible to preferentially project the video by the video signal from the input terminal where the input of the video signal is confirmed on both screens.
Further, in the case where the present modification is applied in the second embodiment, when the two-screen display is finished, all the input terminals corresponding to the video source selected on each screen are stored in the storage unit 67. good.

(Modification 2)
This will be described with reference to FIG. In each of the embodiments and the modifications described above, the projector 100 and the projector 200 have been described as projectors that can select two video sources from a plurality of video sources and display them on a single display device on two screens. It is not limited.
For example, the present invention can also be applied to a projector that includes a plurality (three or more) of input selectors 56, identification units 57, and video converters 58 and can display videos from a plurality of video sources on a plurality of screens. In this case, the video source selection method can be applied to any screen among a plurality of screens to be projected.

(Modification 3)
This will be described with reference to FIG. In each of the above embodiments and modifications, the projector 100 and the projector 200 have been described as a configuration using the video signal processing unit 59, the frame memory 60, and the video signal correction unit 61 one by one. However, the present invention is not limited to this. .
For example, as a means for displaying on a plurality of screens, the video signal processing unit 59, the frame memory 60, and the video signal correction unit 61 are configured using the same number of screens, and video signal processing and video signal correction are performed independently for each screen. Even if the projector is used in the same manner, it is possible to obtain the same operations and effects as those of the embodiment and the modification.

(Modification 4)
This will be described with reference to FIG. In each of the above-described embodiments and modifications, the video source has been described by taking as an example six types of “Computer 1”, “Computer 2”, “DVI-D”, “S-Video”, “Video”, and “HDMI”. However, the present invention is not limited to this.
For example, a configuration in which “component video” and “BNC” are further added as video sources, and corresponding input terminals, a mini D-sub 15-pin terminal and a BNC terminal are additionally provided.
Further, even when a video source by a serial communication terminal such as a USB or a communication means such as a LAN is used, the same operations and effects as those of the embodiment and the modification can be obtained.

(Modification 5)
This will be described with reference to FIG. In each of the above-described embodiments and modifications, the projector 100 and the projector 200 have been described as a liquid crystal three-plate projection projector using three liquid crystal light valves 52R, 52G, and 52B as light modulation elements, but the present invention is not limited thereto. It is not a thing.
For example, a projector may have a configuration using a single-plate liquid crystal light valve in which red, green, and blue color filters are regularly arranged in a lattice pattern and a single sheet can emit full-color modulated light. good. Further, a configuration using a reflective liquid crystal display device or a tilt mirror device may be used.
Even if it is these structures, the effect similar to the said embodiment and modification can be acquired.

(Modification 6)
This will be described with reference to FIG. In each of the above embodiments and modifications, the projector 100 and the projector 200 use a discharge lamp as a light source. However, the present invention is not limited to this, and a solid light source such as an LED or a laser may be used as a light source.

(Modification 7)
This will be described with reference to FIG. In each of the above-described embodiments and modifications, the example in which the video source selection method of the present invention is applied to the front type projector 100 and the projector 200 has been described, but the present invention is not limited to this. For example, the present invention can be applied to rear projection televisions, liquid crystal televisions, plasma televisions, CRT televisions, personal computer monitors, organic EL displays, and other various video display devices.

  DESCRIPTION OF SYMBOLS 51 ... Lamp as a light source part, 52R, 52G, 52B ... Liquid crystal light valve as a display part and a light modulation element, 53 ... Operation part, 54 ... Remote control as an operation part, 55 ... Operation reception part, 56a, 56b ... Input Selector, 57a, 57b ... identification unit, 58a, 58b ... video converter, 59 ... video signal processing unit, 60 ... frame memory, 61 ... video signal correction unit, 62 ... OSD memory, 63 ... liquid crystal panel drive unit, 64 ... optical 65, projection lens, 66 ... control unit, 67 ... storage unit, 68 ... power supply unit, 69 ... lamp drive unit, 71, 72 ... dichroic film, 73 ... cross dichroic prism, 80 ... external power supply, 100 ... projector, T1 to T6: Input terminals.

Claims (4)

A video display device for displaying a video represented by a video signal on a display unit,
A plurality of input terminals for inputting the video signals supplied from a plurality of video sources for each of the video signals;
An input selector for selecting a desired input terminal from the plurality of input terminals;
An identification unit for identifying whether or not the video signal is input to the selected input terminal;
A video signal processing unit that performs a multiple image synthesis process for synthesizing the video signal input from at least two input terminals selected by the input selector into one image;
An operation unit for accepting an operation for starting and ending the multiple image composition processing;
With
When an operation for starting the multiple image composition processing is performed by the operation unit, the input selector selects the plurality of input terminals in a predetermined order, and the identification unit selects the video signal at the selected input terminal. The video image is displayed on the display unit as one of the composite images, by identifying whether or not the video signal is input, and displaying the video signal from the input terminal for which the video signal is input by the identifying unit. Display device. The video display device according to claim 1, further comprising a storage unit that stores an input terminal selected when the multi-image synthesis process is completed,
The input selector preferentially selects the input terminal stored in the storage unit when an operation for starting the multi-image composition processing is performed by the operation unit. . The video display device according to claim 1, further comprising a determining unit that determines whether or not two screens can be displayed for a combination of at least two input terminals.
When the plurality of input terminals are selected by the input selector, the determination unit determines whether or not a plurality of input terminals can be displayed on a combination with the input terminal selected on another screen. An image display device, wherein an input terminal capable of screen display is selected. A video display method for displaying video represented by a video signal,
Selecting a plurality of input terminals to which the video signals supplied from a plurality of video sources are input in a predetermined order;
Identifying whether the video signal is input to the selected input terminal;
A video display method characterized in that video based on the video signal input from at least two input terminals for which input of the video signal has been confirmed is combined and displayed as one image.

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