WO2014109026A1

WO2014109026A1 - Display device

Info

Publication number: WO2014109026A1
Application number: PCT/JP2013/050256
Authority: WO
Inventors: 橋川　広和
Original assignee: パイオニア株式会社
Priority date: 2013-01-10
Filing date: 2013-01-10
Publication date: 2014-07-17
Also published as: JPWO2014109026A1; JP6081494B2

Abstract

Provided is a display device which allows vivid observation of an exhibit and video displayed on a screen. When a synchronization control unit (31) switches a screen (21) to a scattering mode, the synchronization control unit (31): outputs, to a lighting device (41), lighting control information for causing the lighting device (41) to darken; and outputs, to a projector (11), projection cont rol information for causing video light to be projected from the projector (11) to the screen (21). When the screen (21) is switched to a transmission mode, projection control information for causing projection of video light from the projector (11) to stop is outputted to the projector (11), and lighting control information for causing the lighting device (41) to light up is outputted to the lighting device (41).

Description

Display device

The present invention relates to a display device that displays video.

Conventionally, in the display devices such as show windows, showcases, showrooms, etc., when various information such as information on exhibits is given to the observer, it has been done by installing a panel or display device separately. Information could not be displayed.

For example, Patent Document 1 describes that a hologram screen is provided on a cover glass of a show window, a showcase, etc., and information is displayed at the same time as the exhibits are displayed.

Patent Document 2 describes that a translucent screen sheet is installed on the front glass of a showcase, and information is projected and displayed on the screen sheet.

Japanese Patent Laid-Open No. 9-28530 JP 2012-32613 A

In the case of an information display exhibition apparatus using a hologram described in Patent Document 1, an image must be projected from a predetermined position on the hologram screen, and there is no degree of freedom in the projection position. In addition, the diffraction angle by the screen is also determined at the time of design, and there is a problem that the observation angle range of the observed light is narrow and the viewpoint position of the observer is limited.

Also, since the hologram screen generates a diffraction phenomenon using the refractive index distribution inside the screen, the light extraction efficiency is poor. Also, for the same reason, the clearness is lost due to the influence of light from the exhibits installed in the showcase. The hologram screen has a problem that it is very expensive.

In the case of the showcase described in Patent Document 2, the actual exhibit behind the video display area on the translucent screen becomes invisible. Also, if the viewpoint is changed, the positional relationship between the video display area on the screen and the actual exhibit changes, so that the video display area and the actual exhibit overlap or open, so that it is optimal (ie production The viewpoint position is fixed), and it is not suitable for applications in which a plurality of observers observe at the same time. In addition, the image display area on the screen is always exposed to light emitted from the actual display from behind the screen, and there is a problem that the contrast of the display image is always poor.

Therefore, in view of the above-described problems, an object of the present invention is to provide a display device that can clearly observe, for example, images displayed on a screen and exhibits.

In order to solve the above-mentioned problem, the invention described in claim 1 has a first surface and a second surface which is a back surface of the first surface, and has a transmission state and a scattering state with respect to visible light. A switchable screen; and control means for switching the transmission state and the scattering state of the screen. When the screen is switched to the scattering state, the control means controls the illumination on the second surface side. Illumination control information for reducing light intensity is output, projection control information for projecting a first image on the screen is output during any period when the screen is switched to the scattering state, and the screen is in the transmission state The projection control information for stopping projection of the first video is output, and the second surface is switched to an arbitrary period during which the screen is switched to the transmission state. The outputs illumination control data for increasing the light intensity of the lighting, it is a display device according to claim.

According to a second aspect of the present invention, there is provided a screen having a first surface and a second surface that is the back surface of the first surface and capable of switching between a transmission state and a scattering state with respect to visible light, and the screen Control means for switching the transmission state and the scattering state of the second image, and the control means, when the screen is switched to the scattering state, displays the light intensity of the second image on the display means on the second surface side. Display control information for reducing the screen, output projection control information for projecting the first image on the screen, and switch the screen to the transmission state during an arbitrary period when the screen is switched to the scattering state. If it is, the projection control information for stopping the projection of the first video is output, and the second means is displayed on the display means during an arbitrary period when the screen is switched to the transmission state. And outputs the display control information for increasing the light intensity of the image, it is a display device according to claim.

The invention described in claim 8 includes a screen having a first surface and a second surface which is the back surface of the first surface, and capable of switching between a transmissive state and a scattering state with respect to visible light. A control step of switching a scattering state, and when the screen is switched to the scattering state, the control step outputs illumination control information for reducing light intensity of illumination on the second surface side, and the screen When the screen is switched to the scattering state, projection control information for projecting the first video onto the screen is output, and when the screen is switched to the transmissive state, the projection of the first video is performed. The projection control information for stopping the illumination and the illumination control information for increasing the light intensity of the illumination on the second surface side in an arbitrary period during which the screen is switched to the transmission state. Forces, a display method wherein the.

The invention described in claim 9 includes a screen having a first surface and a second surface which is the back surface of the first surface, and capable of switching between a transmissive state and a scattering state with respect to visible light. Display control information including a control step of switching a scattering state, wherein the control step reduces the light intensity of the second image on the display means on the second surface side when the screen is switched to the scattering state. Output the projection control information for projecting the first video on the screen in any period when the screen is switched to the scattering state, and when the screen is switched to the transmissive state, The projection control information for stopping the projection of the first video is output, and the light intensity of the second video is increased on the display means during an arbitrary period when the screen is switched to the transmission state. And it outputs the display control information to a display wherein the.

The invention described in claim 10 is a display program characterized by causing a display method according to claim 8 to be executed by a computer.

The invention described in claim 11 is a display program characterized in that the display method according to claim 9 is executed by a computer.

The invention described in claim 12 is a computer-readable recording medium in which the display program according to claim 10 is stored.

The invention described in claim 13 is a computer-readable recording medium in which the display program according to claim 11 is stored.

It is a schematic block diagram of the exhibition apparatus provided with the display apparatus concerning the 1st Example of this invention. It is typical sectional drawing of the screen shown by FIG. FIG. 2 is a timing chart of the state of the screen shown in FIG. 1, the linear transmittance of light beams of a light control unit, and the intensity of image light projected from a projector. 2 is a flowchart illustrating an operation of the display device illustrated in FIG. 1. It is explanatory drawing which performs a cross fade by changing the duty of the scattering state of a screen shown by FIG. 1, and a permeation | transmission state. It is explanatory drawing which performs a cross fade by changing the light intensity of the projector shown in FIG. 1, and an illuminating device. It is a schematic block diagram of the display apparatus concerning the 2nd Example of this invention. FIG. 8 is a timing chart of the state of the screen shown in FIG. 7, the linear transmittance of light beams from the light control unit, and the intensity of image light projected from the projector. FIG. 8 is an explanatory diagram of transmission and display of a video source displayed on the screen and the opaque display shown in FIG. 7.

Hereinafter, a display device according to an embodiment of the present invention will be described. A display device according to an embodiment of the present invention has a first surface and a second surface that is the back surface of the first surface, and a screen that can switch between a transmission state and a scattering state for visible light, and And control means for switching the transmission state and the scattering state of the screen. And when the control unit is switching the screen to the scattering state, it outputs illumination control information for reducing the light intensity of the illumination on the second surface side, and in an arbitrary period during which the screen is switched to the scattering state, When the projection control information for projecting the first video on the screen is output and the screen is switched to the transmission state, the projection control information for stopping the projection of the first video is output, and the screen is switched to the transmission state. Illumination control information for increasing the light intensity of the illumination on the second surface side is output during an arbitrary period. In this way, when the screen is in a scattered state, the light intensity of the illumination for displaying the image and illuminating the exhibits etc. is reduced, so that the contrast of the displayed image can be made very high. When the screen is in a transmissive state, it is possible to increase the light intensity of illumination and observe an exhibit or the like. Therefore, it is possible to clearly observe the video displayed on the screen and the exhibit.

A display device according to another embodiment has a first surface and a second surface that is the back surface of the first surface, and a screen that can switch between a transmission state and a scattering state for visible light, and And control means for switching the transmission state and the scattering state of the screen. When the screen is switched to the scattering state, the control means outputs display control information for reducing the light intensity of the second image to the second surface side display means, and switches the screen to the scattering state. The projection control information for projecting the first video on the screen is output during an arbitrary period, and when the screen is switched to the transmission state, the projection control information for stopping the projection of the first video is output, and the screen The display control information for increasing the light intensity of the second video is output to the display means on the second surface side in an arbitrary period during which the screen is switched to the transmission state. In this way, when the screen is in a scattering state, the light intensity of the display means that displays the first video and displays the second video is reduced, so the first video that is displayed The contrast of the second image can be displayed very high on the display means when the screen is in a transmissive state. Therefore, it is possible to clearly observe both the first video displayed on the screen and the second video displayed on the display means.

Further, the control means may alternately switch the transmission state and the scattering state of the screen at a predetermined cycle. By doing in this way, since display of a screen and observation of an exhibit and a display means can be performed alternately, each display and observation can be performed by time division. Therefore, it is possible to simultaneously display the screen and observe the exhibits and display means.

Further, the control means may change the ratio between the transmission state and the scattering state in one cycle of the predetermined cycle of the screen. By doing so, for example, it is possible to increase the ratio of the screen display and the exhibits and display means that want to show more clearly, such as the screen display and the contents of the exhibits and display means. Each way of viewing can be changed accordingly.

In addition, the control means gradually increases the ratio of the transmission state and the ratio of the transmission state and gradually decreases the ratio of the transmission state and the ratio of the transmission state in one cycle of the predetermined period of the screen. You may make it change so that it may reduce gradually and the ratio of a scattering state may increase gradually. By doing in this way, for example, it is possible to observe the exhibits and display means gradually from the screen display state, and then it is possible to perform effects such as crossfading that changes to the display state of the exhibits and display means thereafter. .

Further, the control means may include information for changing the light intensity of the first video in the projection control information. By doing so, it is possible to increase the light intensity of the screen display and the exhibits and display means that want to show more clearly, such as the contents of the screen display and the exhibits and display means, etc. Each way of showing can be changed according to.

In addition, the control means gradually increases the light intensity of the first image and gradually decreases the light intensity of the illumination or the second image, gradually decreases the light intensity of the first image and the illumination or the second image. The light intensity of the second image may be gradually increased. By doing so, for example, by changing the light intensity, it is possible to achieve an effect such as a crossfade.

In addition, a display method according to an embodiment of the present invention includes a first surface and a second surface that is the back surface of the first surface, and a screen capable of switching between a transmission state and a scattering state with respect to visible light. Includes a control step of switching between the transmission state and the scattering state. And when the control step is switching the screen to the scattering state, it outputs illumination control information for reducing the light intensity of the illumination on the second surface side, and in an arbitrary period during which the screen is switched to the scattering state, When the projection control information for projecting the first video on the screen is output and the screen is switched to the transmission state, the projection control information for stopping the projection of the first video is output, and the screen is switched to the transmission state. Illumination control information for increasing the light intensity of the illumination on the second surface side is output during an arbitrary period. In this way, when the screen is in a scattered state, the light intensity of the illumination for displaying the image and illuminating the exhibits etc. is reduced, so that the contrast of the displayed image can be made very high. When the screen is in a transmissive state, it is possible to increase the light intensity of illumination and observe an exhibit or the like. Therefore, it is possible to clearly observe the video displayed on the screen and the exhibit.

In addition, a display method according to another embodiment of the present invention includes a first surface and a second surface that is the back surface of the first surface, and a screen that can switch between a transmission state and a scattering state with respect to visible light. Includes a control step of switching between the transmission state and the scattering state. In the control step, when the screen is switched to the scattering state, display control information for reducing the light intensity of the second image is output to the display means on the second surface side, and the screen is switched to the scattering state. During this period, projection control information for projecting the first video on the screen is output, and when the screen is switched to the transmission state, projection control information for stopping the projection of the first video is output and transmitted through the screen. Display control information for increasing the light intensity of the second video is output to the display means on the second surface side during an arbitrary period of switching to the state. In this way, when the screen is in a scattering state, the light intensity of the display means that displays the first video and displays the second video is reduced, so the first video that is displayed The contrast of the second image can be displayed very high on the display means when the screen is in a transmissive state. Therefore, it is possible to clearly observe both the first video displayed on the screen and the second video displayed on the display means.

Further, the display method described above may be configured as a display program that is executed by a computer. By doing so, since the program is executed by a computer, dedicated hardware or the like is not necessary, and it can be installed and functioned in a general-purpose information processing apparatus.

Further, the display program described above may be stored in a computer-readable recording medium. In this way, the program can be distributed as a single unit in addition to being incorporated in the device, and version upgrades can be easily performed.

The display device 1 including the display device 2 according to the first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the exhibition apparatus 1 includes a display device 2, a projector 11, and a lighting device 41. The display device 2 and the projector 11 are transmissive projection devices that project (project) the image light (projected image) of the projector 11 and transmit and scatter it on the screen 21 (projection surface). In FIG. 1, only the screen 21 is disposed between the observer and the actual exhibit 51. For example, the actual exhibit 51 is accommodated in a show window, a showcase, and the like. At least one surface facing the observer may be configured by the screen 21 or may be attached.

The display device 2 includes a screen 21 and a synchronization control unit 31.

FIG. 2 is a schematic cross-sectional view of the screen 21 that can control the optical state. The screen 21 shown in FIG. 2 has a light control unit 25 that is an optical layer in which a composite material containing liquid crystal is sandwiched between a pair of transparent glass substrates 23 and 24. A counter electrode 26 is formed on the entire surface of one glass substrate 24 on the light control unit 25 side. A control electrode 27 is formed on the entire surface of the other glass substrate 23 on the light control section 25 side. An intermediate layer made of an insulator may be formed between the

electrodes

26 and 27 and the light control unit 25.

The screen 21 includes a light control unit 25 made of an element or a material that can change an optical state by applying a voltage. The optical state of the light control unit 25 is a state in which the scattering state displays an image, and a transparent transmission state in which the scattering of incident light is smaller and the linear transmittance of light is higher than that is a non-image display state in which no image is displayed. It is. The light control unit 25 is disposed between the counter electrode 26 and the control electrode 27. That is, the light control unit 25 is sandwiched between two electrodes and can switch an optical state between a transmission state and a scattering state by a voltage applied between the two electrodes.

As the light control unit 25, one that can switch an optical state between a scattering state and a transmission state, for example, a so-called polymer dispersed liquid crystal (PDLC) in which nematic liquid crystal domains are distributed in a polymer can be used. In addition, a better optical state can be realized by using a composite material that is associated with the orientation of liquid crystal molecules in which a polymer network forms domains in a state where no voltage is applied.

As an example using PDLC, a suitable amount of photopolymerizable monomer, nematic liquid crystal and polymerization initiating material are mixed and placed between 5 and 50 micron substrates of glass or resin constituting the light control member. The liquid crystal domain can be dispersed in the polymer by irradiating with ultraviolet rays under conditions such as phase separation temperature. In this case, the normal mode is designed so that the scattering due to the refractive index difference between the polymer and the liquid crystal is large when no voltage is applied, and the refractive index difference in the substrate normal direction is small when the liquid crystal is aligned by an electric field. Called. In addition, it is also possible to use a capsule containing a nematic liquid crystal mixed with a monomer and a polymerization initiator.

As a composite material associated with the orientation of liquid crystal molecules in which a polymer network forms domains in a state where no voltage is applied, a photopolymerizable monomer has liquid crystal properties. The substrate is subjected to an alignment process such as rubbing, and the mixed material disposed between the substrates has an arrangement based on the alignment process. By irradiating ultraviolet rays in this state, the above initial arrangement is obtained when no voltage is applied, and scattering occurs due to the difference in refractive index between the liquid crystal domain and the polymer when the voltage is applied. In addition, when the unidirectional arrangement is used, it has optical characteristics depending on this orientation. However, it is also possible to use an optical characteristic that does not depend on the polarization of incident light by adding a chiral material and twisting the initial arrangement. . In this case, the scattering due to the difference in refractive index between the polymer and the liquid crystal is small when a normal voltage is not applied, and the refractive index difference is increased when the liquid crystal is aligned by an electric field, which is called a reverse mode.

That is, in the normal mode, a transmission state is obtained when a predetermined voltage is applied between the electrodes, and a scattering state is obtained when no voltage is applied between the electrodes. In the reverse mode, a scattering state occurs when a predetermined voltage is applied between the electrodes, and a transmission state occurs when no voltage is applied between the electrodes.

The counter electrode 26 and the control electrode 27 are formed as transparent electrodes using, for example, ITO (indium tin oxide).

From the observer located on the glass substrate 24 side of the screen 21, when the light control unit 25 of the screen 21 is in a scattering state, the screen 21 appears to be clouded, for example. On the other hand, when the dimming unit 25 is in the transmissive state, the screen 21 is in the transmissive state, so that the actual exhibit 51 can be observed through the screen 21. Therefore, when the light control unit 25 is in the scattering state, the image light projected from the projector 11 can be displayed on the screen 21, and in the transmission state, the screen 21 has transparency that can recognize the actual exhibit 51.

In the present embodiment, the surface 24a of the screen 21 that does not contact the light control portion 25 of the glass substrate 24 is the first surface, and the surface 23a of the glass substrate 23 that does not contact the light control portion 25 is the second surface 23a. Are arranged such that the first surface faces the observer side and the second surface faces the entity exhibit 51 side, but the surface 24a is the second surface and the entity exhibit 51 side and the surface 23a are the first surface. You may arrange | position so that it may face to the observer side as a surface.

A voltage is applied to the screen 21 so as to generate a potential difference between the control electrode 27 and the counter electrode 26. As the drive waveform (drive voltage waveform), for example, one electrode may be in a DC state (0 volt), and an AC voltage may be applied to the other electrode, or an AC voltage whose phase is inverted to both electrodes. May be applied to generate a potential difference. That is, when a voltage is applied so as to generate a potential difference between the control electrode 27 and the counter electrode 26, the screen 21 is in a transmission state when in the normal mode, and is in a scattering state when in the reverse mode. In the following description, the screen 21 may be in either the normal mode or the reverse mode.

When the image light is projected, the synchronization control unit 31 as the control unit controls the dimming unit 25 of the screen 21 on which the image light is projected to scatter the image light, and is not projected. To control the transmission state. That is, a voltage is applied so that the light control unit 25 is in a scattering state or a transmission state. As shown in FIG. 1, the synchronization control unit 31 is connected to the projector 11, the screen 21, and the illumination device 41. The synchronization control unit 31 controls the switching of the optical state of the screen 21 (the light control unit 25) and the lighting device 41 between turning on and off in synchronization with the projection of the image light of the projector 11. Further, as the synchronization signal input from the projector 11 to the synchronization control unit 31, for example, a synchronization signal synchronized with the video frame period of the video signal input to the projector 11 can be used.

The synchronization control unit 31 may include a CPU (Central Processing Unit), a memory, and the like, and may be configured by a computer whose operation is controlled by a program, or an ASIC (Application Specific Specific Integrated Circuit) or the like. It may be hardware.

The projector 11 is disposed on the real display 51 side of the screen 21. The projector 11 may be any projector as long as it can project video light modulated by video information onto the screen 21. That is, the first video is projected on the screen 21. Note that the video information is obtained from a video signal input to the projector 11. The projector 11 may receive a video signal of a still image as well as a video signal of a moving image. Further, the projector 11 may be arranged not only on the real display 51 side of the screen 21 but also on the observer side.

The illumination device 41 is preferably arranged on the entity display 51 side of the screen 21, but can also be arranged on the viewer side of the screen 21. The lighting device 41 illuminates the actual exhibit 51. The illumination device 41 is preferably capable of switching on and off at a high speed of one video cycle or less to be described later, such as LED (Light-Emitting-Diode) light and organic EL (Electro-Luminescence) illumination.

FIG. 3 shows the state of the screen 21 configured as described above, the linear transmittance of the light beam of the light control unit 25, the intensity (light intensity) of the image light projected from the projector 11, and the illumination light intensity of the illumination device 41. It is a timing chart.

As shown in FIG. 3, the screen 21 changes between a scattering state and a transmission state once within one video period. That is, the transmission state and the scattering state are alternately switched at a predetermined cycle. One video cycle is one frame period of a video signal input to the projector 11 and is, for example, about 50 to 60 Hz. Therefore, the screen 21 is switched between the scattering state and the transmission state in a period shorter than one video cycle.

When the screen 21 (light control unit 25) is in a scattering state, the linear transmittance of the light beam of the light control unit 25 decreases. Since light incident on the screen during this period is scattered, an image can be displayed. Accordingly, since the projector 11 projects the image light onto the screen 21, the image light intensity increases and an image is displayed. On the other hand, during the period in which the screen 21 is in the scattering state, the illumination device 41 is switched off. This is because the contrast of the video displayed on the screen 21 is lowered by the influence of the lighting device 41 if the lighting device 41 is lit while the video is displayed.

When the screen 21 is in the transmissive state, the linear transmittance of the light beam of the light control unit 25 increases. Light incident on the screen during this period is transmitted as it is. Accordingly, the projector 11 stops projecting the image light on the screen 21. On the other hand, during the period in which the screen 21 is in the transmissive state, the lighting device 41 switches to lighting. When the lighting device 41 is turned on, the real exhibit 51 is illuminated and can be clearly observed through the screen 21.

On the screen 21, the image of the entire screen is repeatedly projected every one image period, and this repetition is not recognized as blinking by the human eye, but is projected onto the screen 21 by time averaging (integration). The image and the actual exhibit 51 can be simultaneously observed without feeling flicker.

The above operation is summarized in the flowchart of FIG. The flowchart shown in FIG. 4 is executed by the synchronization control unit 31.

First, in step S1, a synchronization signal for detecting the head of one video cycle is detected, and the process proceeds to step S2. The synchronization signal may be a synchronization signal synchronized with the video frame period of the video signal input to the projector 11 described above. Note that the projector 11 and the illumination device 41 are set to an initial state in which no image light is projected and a light-off state, respectively.

Next, in step S2, a voltage is applied to the counter electrode 26 and the control electrode 27 so that the screen 21 is in a scattering state, and the process proceeds to step S3.

Next, in step S3, image light is projected on the projector 11, and the process proceeds to step S4. That is, projection control information for causing the projector 11 to project video light as the first video is output. The projection control information may be a control signal system in which the start and stop of projection are defined at a high level and a low level of one signal line, and is composed of a combination of a high level and a low level of a plurality of signal lines. A command format in which start and stop of projection are defined in the command or the like may be used. Further, this step is performed after the transient state shown in FIG. 3 has elapsed. The period of the transient state can be calculated in advance by the material constituting the light control unit 25 and the applied voltage.

Next, in step S4, the projection of the video performed in step S3 is stopped after the elapse of a predetermined period, and the process proceeds to step S5. The projection period of this image is determined according to the period of the scattering state of the screen 21. That is, the projector 11 outputs projection control information for stopping the projection of the image light to the projector 11.

Next, in step S5, a voltage is applied to the counter electrode 26 and the control electrode 27 so that the screen 21 is in a transmissive state, and the process proceeds to step S6.

Next, in step S6, the lighting device 41 is turned on and the process proceeds to step S7. Of course, this step is performed after the transient state shown in FIG. That is, the illumination control information for lighting the illumination device 41 on the second surface side is output. The illumination control information may be a control signal system in which lighting and extinguishing are defined at a high level and a low level of one signal line, a command composed of a combination of a high level and a low level of a plurality of signal lines, etc. It may be a command format in which ON and OFF are defined.

Next, in step S7, the lighting device 41 is turned off after a predetermined period of time, and the process proceeds to step S8. The lighting period of the video illumination device 41 is determined according to the period of the transmission state of the screen 21. That is, the illumination control information for turning off the illumination device 41 on the second surface side is output.

Next, in step S8, it is determined whether or not the use of the exhibition apparatus 1 is to be ended. When it is to be ended (YES), the flowchart is ended, and when it is not to be ended (NO), the process returns to step S1. That is, this flowchart functions as a control process.

Here, the luminance of the screen 21 can be increased by increasing the ratio (hereinafter referred to as duty) of the time during which the light adjusting unit 25 is in the transmission state and the scattering state in one video cycle, and conversely the duty is reduced. Then, the actual exhibit 51 can be clearly illuminated. That is, when the duty is large, the ratio of the scattering state in one video period increases, and when the duty is small, the ratio of the transmission state in one video period increases.

The maximum brightness of the screen 21 and the actual exhibit 51 changes depending on the duty. The brightness of the video displayed on the screen 21 can be changed according to the video signal level input to the projector 11 or the intensity of the projection light. It is also possible to make the actual exhibit 51 appear darker or brighter by dimming the lighting device 41. As described above, more complex effects such as a cross-fade effect can be provided by controlling the duty and dimming on the projector 11 side and the illumination device 41 side. Of course, duty control and dimming control may be combined.

A specific operation example of the crossfade effect will be described with reference to FIGS. FIG. 5 is an example in which the crossfade effect is performed by changing the duty. FIG. 5A is basically the same as the timing chart shown in FIG. 3, but as an example, one video period is 10 milliseconds, the scattering state Ta is 5 milliseconds, the transmission state Tb is 4 milliseconds, The transient state when changing to the scattering state and the transmission state is 0.5 milliseconds. The light intensity of the projector 11 is A, and the illumination light intensity of the illumination device 41 is B.

In this case, when the scattering state time Ta is increased to 1 to 8 milliseconds and the transmission state time Ta is decreased to 8 to 1 millisecond, as shown in FIG. The maximum light intensity (the maximum brightness value of the image on the screen 21) changes in order from 1A to 8A, and the maximum illumination light intensity (the maximum brightness value of the actual exhibit 51 (illumination device 41)) sequentially changes from 8B to 1B. Change. In the table of FIG. 5 (b), the unit of the cross fading time may be arbitrarily set as long as it is a time longer than one video cycle such as a video cycle or a second.

That is, the ratio of the transmission state and the scattering state in one image period of the screen 21 is gradually increased while the ratio of the scattering state is gradually decreased and the ratio of the transmission state is gradually decreased and the scattering is performed. The state ratio is changed to gradually increase. In this way, for example, the image gradually disappears from the state in which the image is displayed on the screen 21, and the actual exhibit 51 starts to gradually appear, and finally only the actual exhibit 51 can be seen. Crossfading effect can be realized.

Next, FIG. 6 will be described. FIG. 5 is an example in which the crossfade effect is performed by changing the light intensity. FIG. 6A is also similar to the timing chart shown in FIG. 5A, except that the scattering state Ta is 1 millisecond, the transmission state Tb is 8 milliseconds, and the transient when changing from the scattering state to the transmission state. The state is fixed at 0.5 milliseconds. The maximum light intensity of the projector 11 is Amax, and the maximum illumination light intensity of the illumination device 41 is Bmax.

In this case, when the light intensity of the projector 11 is increased by 1/8 and the illumination light intensity is decreased by 1/8, as shown in FIG. 6B, the maximum light intensity from the projector 11 ( The maximum brightness value of the image on the screen 21 changes in order from 0 to 1 Amax, and the maximum illumination light intensity (the maximum brightness value of the actual exhibit 51 (illumination device 41)) changes in order from 8Bmax to 0. This can be output by including light intensity information for changing the light intensity in addition to the start or stop of projection, lighting or extinguishing, in the projection control information or illumination control information. In this light intensity information, for example, the light intensity may be designated as an absolute value, or a relative value (such as −12.5%) from the current value may be designated.

That is, the light intensity of the image is gradually increased and the light intensity of the illumination device 41 is gradually decreased, and the light intensity of the image is gradually decreased and the light intensity of the illumination device 41 is gradually increased. Even in this way, for example, the image gradually disappears from the state in which the image is displayed on the screen 21, and the actual exhibit 51 starts to gradually appear, and finally only the actual exhibit 51 can be seen. Cross-fade effect can be realized without changing the duty.

According to the present embodiment, when the synchronization control unit 31 switches the screen 21 to the scattering state, the lighting control information for turning off the lighting device 41 is output to the lighting device 41, and the image light is output from the projector 11 to the screen 21. Is output to the projector 11. When the screen 21 is switched to the transmissive state, the projector 11 outputs projection control information for stopping projection of image light to the projector 11, and outputs illumination control information for lighting the lighting device 41 to the lighting device 41. . In this way, when the screen 21 is in a scattered state, the illumination device 41 for displaying the image and illuminating the actual exhibit 51 is turned off, so that the contrast of the displayed image is very high. When the screen 21 is in a transmissive state, the lighting device 41 can be turned on to observe the actual exhibit 51. Therefore, the image displayed on the screen 21 and the actual exhibit 51 can be clearly observed. Moreover, since the illuminating device 41 is turned off in the scattering state, the power consumption of the illuminating device 41 can be reduced.

Further, since the transmission state and the scattering state of the screen 21 are alternately switched in one video cycle, the display of the screen 21 and the observation of the actual exhibit 51 can be performed alternately. That is, each display and observation can be performed by time division. Therefore, the display on the screen 21 and the observation of the actual exhibit 51 can be performed simultaneously. Furthermore, since the time division is used, both the image and the actual exhibit 51 can be observed even if the observer moves, and there is no restriction on the observation position.

In addition, the duty of the transmission state and the scattering state in one video period of the screen 21 is gradually increased as the transmission state ratio is gradually decreased, and the scattering state ratio is gradually decreased, or conversely, the transmission state ratio is gradually decreased. And the ratio of the scattering state is changed so as to gradually increase. By doing so, for example, the actual exhibit 51 can be gradually observed from the display state of the screen 21, and then the effect of crossfade that changes to the observation state of the actual exhibit 51 afterwards, or conversely, the actual display. From the state in which only the object 51 is observable, the display of the screen 21 gradually appears, and thereafter, the effect of cross-fading that changes to the display of the screen 21 can be performed.

Further, the light intensity of the projector 11 is gradually increased and the light intensity of the illumination device 41 is gradually decreased. Conversely, the light intensity of the projector 11 is gradually decreased and the light intensity of the illumination device 41 is gradually increased. I am doing so. In this way, for example, by changing the intensity of light, it is possible to perform effects such as crossfading independently of the duty of the transmission state and the scattering state.

Further, since a transmission type projection apparatus including the projector 11 and the screen 21 is used, the degree of freedom of the projection position of the projector 11 is increased. Further, since the screen 21 supports the entire visible light range, the wavelength of the image light projected from the projector is not limited. Further, the light transmission and light diffusion efficiency of the screen 21 can be increased by time-sharing control, and light loss hardly occurs.

Next, a display device according to a second embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

In this embodiment, an opaque display 61 as a display means is provided instead of the lighting device 41 and the actual exhibit 51.

The opaque display 61 is arranged on the second surface side of the screen 21 like the entity display 51 of the first embodiment, and receives a video signal such as a moving image, a still image, or character information as a second image. It is displayed towards the observer. As the opaque display 61, a flat panel display such as an LED-backlit liquid crystal display or an EL display that can be turned on and off at high speed in the same manner as the lighting device 41 can be used. The opaque display 61 in this embodiment needs to have a luminance that allows an observer to observe the displayed image. Therefore, the opaque display 61 is preferably composed of a self-light emitting element or provided with light emitting means such as a backlight. .

FIG. 8 shows the state of the screen 21 of this embodiment, the linear transmittance of the light beam of the light control unit 25, the intensity (light intensity) of the image light projected from the projector 11, and the illumination light intensity of the illumination device 41. A timing chart is shown. As shown in FIG. 8, when the screen 21 is in the scattering state, the image light from the projector 11 is projected as in FIG. When the screen 21 is in the transmissive state, an image is displayed on the opaque display 61. That is, since an image is displayed on the opaque display 61, the emission intensity is increased.

That is, when the screen 21 is switched to the scattering state, the display control information for stopping the video display is output to the opaque display 61 on the second surface side, and the projection control information for projecting the video to the projector 11 is output. When the screen 21 is switched to the transmissive state, projection control information for stopping the projection of the image is output to the projector 11 and display control information for displaying the image on the opaque display 61 on the second surface side is output. As with the projection control information, the display control information may be started and stopped by a control signal method or a command method.

As described above, in this embodiment, the screen 21 and the opaque display 61 repeatedly project the image of the entire screen every one image period, and this repetition is not recognized as blinking by the human eye. By averaging (integrating), the image projected on the screen 21 and the image displayed on the opaque display 61 can be observed simultaneously without feeling flicker. Effective production is possible.

Here, when the images of the projector 11 and the opaque display 61 are individually transmitted, there is a case where the transmission timing is deviated and the production effect is counterproductive. Each display timing and time distribution must be allocated within one video cycle as described above. However, if the displayed contents have independent time courses, timing control satisfying both can be sufficiently performed. The problem of not occurring.

Therefore, the two video sources are collectively transmitted as one video source, and each of the projectors 11 and the opaque display 61 that receives them extracts each video signal from one video source. As an example of such a video signal, an L-ch (left-eye) video used for 3D (three-dimensional) television broadcasting or the like and a side-by-side signal in which an R-ch (right-eye) video is superimposed are used. it can.

FIG. 9 shows an example in which the above-mentioned two video sources are sent together and received, and the respective projectors 11 and opaque display 61 that receive and extract the respective video signals from one video source are displayed. As shown in FIG. 9, first, an image for the screen 21 and an image for the opaque display 61 are prepared (FIG. 9A). Next, a video transmission device (not shown) or the like sends the screen 21 video and the opaque display 61 video together into a single video source (video signal) using a side-by-side signal or the like (FIG. 9B). Next, in the projector 11, the video signal of the screen video is extracted from the video signals combined into one, and projected onto the screen 21. In the opaque display 61, the video signal of the video for the opaque display 61 is extracted from the combined video signals and displayed (FIG. 9C). Then, it appears that the image for the opaque display 61 is displayed at the back of the screen image positioned in front of the observer (FIG. 9D).

Also in the present embodiment, the cross fade described with reference to FIGS. 5 and 6 can be performed in the same manner.

According to the present embodiment, when the synchronization control unit 31 switches the screen 21 to the scattering state, the display control information for stopping the display of the image is output to the opaque display 61, and the image light from the projector 11 is output to the screen 21. Projection control information for projecting is output. When the screen 21 is switched to the transmission state, projection control information for stopping projection of image light is output from the projector 11, and display control information for displaying an image on the opaque display 61 is output. By doing so, when the screen 21 is in the scattering state, the image from the projector 11 is displayed and the display of the opaque display 61 is stopped. Therefore, the contrast of the image displayed on the screen 21 is very high. When the screen 21 is in the transmissive state, the image on the opaque display 61 can be displayed. Therefore, the display image on the screen 21 and the image displayed on the opaque display 61 can be clearly observed.

Further, since the transmission state and the scattering state of the screen 21 are alternately switched in one video cycle, the display of the screen 21 and the display of the opaque display 61 can be performed alternately. Therefore, each display can be performed in a time division manner. Therefore, the display on the screen 21 and the display on the opaque display 61 can be observed simultaneously.

In addition, the video source of the video light projected from the projector 11 and the video source displayed on the opaque display 61 are collectively sent to each video source, and each video source is extracted by the projector 11 and the opaque display 61. Since both are projected or displayed, the timing of both images can be synchronized.

In the two embodiments described above, the period for projecting image light from the projector 11, the period for lighting the illumination device 41, and the period for displaying the opaque display 61 need to be completely matched with the periods for the scattering state and the transmission state. There is no. In other words, the image light may be projected from the projector 11 in an arbitrary period between the scattering state periods, and the illumination device 41 is turned on or the opaque display 61 is turned on in an arbitrary period between the transmission state periods. You may make it display.

The present invention is not limited to the case where the illumination (or another display device) is completely turned off. For example, when the screen 21 is in a scattering state, the illumination (or another display device) is not completely turned off. Also included are those that reduce the light intensity, such as time-division modulation to be relatively weak. In other words, the image displayed on the screen by controlling to reduce or increase the light intensity (luminance, illuminance, etc.) is not limited to turning off or turning on the lighting, displaying or stopping another display device other than the cross fade. If the light intensity is such that it can clearly observe a physical display and another display device.

Further, the present invention is not limited to the above embodiment. That is, those skilled in the art can implement various modifications in accordance with conventionally known knowledge without departing from the scope of the present invention. Of course, such modifications are included in the scope of the present invention as long as the configuration of the display device of the present invention is provided.

2 Display device 11 Projector 21 Screen 23a Second surface 24a First surface 31 Synchronization control unit (control means)
41 Illumination device 51 Entity display 61 Opaque display

Claims

A screen having a first surface and a second surface that is the back surface of the first surface, and capable of switching between a transmission state and a scattering state for visible light;
Control means for switching the transmission state and the scattering state of the screen, and
The control means includes
When the screen is switched to the scattering state, it outputs illumination control information for reducing the light intensity of the illumination on the second surface side, and in any period during which the screen is switched to the scattering state, Outputting projection control information for projecting the first image on the screen;
When the screen is switched to the transmissive state, the projection control information for stopping the projection of the first video is output, and the second screen is output during an arbitrary period during which the screen is switched to the transmissive state. Outputting the illumination control information for increasing the light intensity of the illumination on the surface side,
A display device characterized by that.
A screen having a first surface and a second surface that is the back surface of the first surface, and capable of switching between a transmission state and a scattering state for visible light;
Control means for switching the transmission state and the scattering state of the screen, and
The control means includes
When the screen is switched to the scattering state, display control information for reducing the light intensity of the second image is output to the display unit on the second surface side, and the screen is switched to the scattering state. Output projection control information for projecting the first video on the screen at an arbitrary period,
When the screen is switched to the transmissive state, the projection control information for stopping the projection of the first video is output, and the display means is displayed in an arbitrary period during which the screen is switched to the transmissive state. Outputting the display control information for increasing the light intensity of the second image;
A display device characterized by that.
3. The display device according to claim 1, wherein the control unit alternately switches the transmission state and the scattering state of the screen at a predetermined cycle.
4. The display device according to claim 3, wherein the control unit changes a ratio of the transmission state and the scattering state in one cycle of the predetermined cycle of the screen.
The control means gradually increases the ratio of the transmission state and the ratio of the scattering state and gradually decreases the ratio of the scattering state in one cycle of the predetermined period of the screen, The display device according to claim 4, wherein the ratio is changed so that the ratio of the transmission state is gradually decreased and the ratio of the scattering state is gradually increased.
6. The display device according to claim 1, wherein the control unit includes information for changing a light intensity of the first video in the projection control information.
The control means gradually increases the light intensity of the first image, gradually decreases the light intensity of the illumination or the second image, and gradually decreases the light intensity of the first image. The display device according to claim 6, wherein the light intensity of the illumination or the second image is gradually increased.
A control step of switching a transmission state and a scattering state of a screen having a first surface and a second surface which is a back surface of the first surface and capable of switching between a transmission state and a scattering state with respect to visible light,
The control step includes
When the screen is switched to the scattering state, it outputs illumination control information for reducing the light intensity of the illumination on the second surface side, and in any period during which the screen is switched to the scattering state, Outputting projection control information for projecting the first image on the screen;
When the screen is switched to the transmissive state, the projection control information for stopping the projection of the first video is output, and the second screen is output during an arbitrary period during which the screen is switched to the transmissive state. Outputting the illumination control information for increasing the light intensity of the illumination on the surface side,
A display method characterized by that.
A control step of switching a transmission state and a scattering state of a screen having a first surface and a second surface which is a back surface of the first surface and capable of switching between a transmission state and a scattering state with respect to visible light,
The control step includes
When the screen is switched to the scattering state, display control information for reducing the light intensity of the second image is output to the display unit on the second surface side, and the screen is switched to the scattering state. Output projection control information for projecting the first video on the screen at an arbitrary period,
When the screen is switched to the transmissive state, the projection control information for stopping the projection of the first video is output, and the display means is displayed in an arbitrary period during which the screen is switched to the transmissive state. Outputting the display control information for increasing the light intensity of the second image;
A display method characterized by that.
A display program that causes a computer to execute the display method according to claim 8.
A display program that causes a computer to execute the display method according to claim 9.
A computer-readable recording medium in which the display program according to claim 10 is stored.
A computer-readable recording medium storing the display program according to claim 11.