Display system

To display easily-seen display information on any display area regardless of an installation location, a display system (1) includes: a projection device (10) that switches and projects emitted light from a spatial light modulator element onto a plurality of display areas; and a control device (20) that controls the projection device to switch a projection direction of projected light from the projection device (10), based on a display condition of display information to be displayed on the display areas. The projection device (10) has: a reflecting mirror that is put in and out of a light path of emitted light from the spatial light modulator element; and a light path switching means that switches the projection direction of projected light by putting the reflecting mirror in and out of the light path of emitted light from the spatial light modulator element in response to control of the control device.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a National Stage of International Application No. PCT/JP2017/033412, filed on Sep. 15, 2017, which claims priority from Japanese Patent Application No. 2016-184073, filed on Sep. 21, 2016, the contents of all of which are incorporated herein by reference in their entirety.

TECHNICAL FIELD

The present invention relates to a display system for displaying display information by projected light.

BACKGROUND ART

In a public facility such as a hotel or a hall, for a user using the facility, projecting and displaying display information onto a ceiling, a wall, or the like by a projector improves convenience. For example, when display information is projected onto a passage of a facility or upward in a room, the display information is easily seen by a user.

However, since a person on a wheelchair or a child often sees below, it is not always desirable to project display information upward for them. Further, when a passage or an upper portion of a room is filled with smoke by a fire or the like, display information projected upward may be visually unrecognized due to smoke. In other words, projecting display information downward may be desired.

PTL 1 discloses a projection-type guidance device for designating a guiding direction by using laser light. The device in PTL 1 includes a light source for emitting a light beam, and a light driving unit for causing the light beam to periodically swing in a projection direction. The light driving unit swings a light beam in response to a drive signal including a first alternate-current signal of a first amplitude at a first frequency, and a second alternate-current signal of a second amplitude larger than the first amplitude at a second frequency lower than the first frequency. In the device in PTL 1, it is possible to display a guiding direction by projecting a light beam whose exit angle periodically changes, onto a projection surface.

CITATION LIST

Patent Literature

SUMMARY OF INVENTION

Technical Problem

In the device in PTL 1, it is possible to display display information in motion on a projection surface. However, the device in PTL 1 includes a problem that it is not possible to display display information of a sufficient size since a scanning area that defines a size of display information is limited by a swing range of a torsion hinge.

Further, the device in PTL 1 is needed to be disposed near a floor surface when laser light is projected onto the floor surface, and is needed to be disposed near a ceiling when laser light is projected onto the ceiling. When laser light is projected from a ceiling onto a floor surface, or from a floor surface onto a ceiling, the laser light may directly radiate a user. Thus, there is a problem that it is necessary to change an installation location of the device in PTL 1 depending on a projection surface.

In order to solve the above-described problems, an object of the present invention is to provide a display system that enables to display easily-seen display information toward any display area, without selecting an installation location.

Solution to Problem

A display system according to the present invention includes: a projection device that switches and projects emitted light from a spatial light modulator element onto a plurality of display areas; and a control device that controls the projection device to switch a projection direction of projected light, based on a display condition of display information to be displayed on the plurality of display areas. The projection device includes a reflecting mirror that is put in and out of a light path of emitted light from the spatial light modulator element, and a light path switching means that switches a projection direction of projected light by putting the reflecting mirror in and out of a light path of emitted light from the spatial light modulator element in response to control of the control device.

Advantageous Effects of Invention

According to the present invention, it is possible to provide a display system that enables to display easily-seen display information toward any display area, without selecting an installation location.

EXAMPLE EMBODIMENT

In the following, example embodiments for achieving the present invention are described using the drawings. Below-described example embodiments include technically preferred limitations for implementing the present invention. The scope of the invention, however, is not limited to the following. Note that, in all drawings for use in describing the following example embodiments, unless there is particularly a reason, similar elements are indicated with same reference numbers. Further, in the following example embodiments, repeated description on a similar configuration/operation may be omitted.

First Example Embodiment

First, a display system according to a first example embodiment of the present invention is described with reference to the drawings.

FIG. 1is a conceptual diagram illustrating a configuration of a display system1in the present example embodiment. Further,FIG. 2is a conceptual diagram illustrating another state of the configuration of the display system1in the present example embodiment. The display system1includes a projection device10and a control device20.

As illustrated inFIG. 1, the projection device10projects projected light150for displaying on a first display area in response to control of the control device20. Projected light150projected from the projection device10is displayed on the first display area as display information. The first display area is a screen where projected light150projected from the projection device10is displayed as display information.

Further, as illustrated inFIG. 2, the projection device10projects projected light300for displaying on a second display area in response to control of the control device20. Projected light300projected from the projection device10is displayed on the second display area as display information. The second display area is a screen where projected light300projected from the projection device10is displayed as display information.

The control device20emits projected light150or projected light300by controlling the projection device10. The control device20projects projected light150for displaying on the first display area by controlling the projection device10. Further, the control device20projects projected light300for displaying on the second display area by controlling the projection device10.

For example, the control device20receives a switching signal from an unillustrated host system, and switches a projection direction of light to be projected from the projection device10in response to the switching signal. When receiving the switching signal during a period when projected light150is projected onto the first display area, the control device20switches in such a way that projected light300is projected onto the second display area. Further, when receiving the switching signal during a period when projected light300is projected onto the second display area, the control device20switches in such a way that projected light150is projected onto the first display area. Note that, when the control device20is able to generate the switching signal, the control device20may switch a projection direction of light to be projected from the projection device10in response to the switching signal generated by the own device.

Subsequently, each constituent element of the display system1in the present example embodiment is described in detail.

FIG. 3is a conceptual diagram illustrating a configuration of the projection device10of the display system1.FIG. 4is a conceptual diagram illustrating another state of the configuration of the projection device10of the display system1.

As illustrated inFIG. 3, the projection device10includes a light source11, a light source driving power supply12, a spatial light modulator element13, a modulator element control circuit14, a projection optical system15, and a light path switching means30. The light path switching means30includes a reflecting mirror31and a movable part33. Note thatFIG. 3is a conceptual diagram, and does not accurately illustrate a positional relationship among constituent elements, a radiation direction of light, and the like.

The light source11emits light110of a specific wavelength. For example, a laser light source may be employed as the light source11. Light110to be emitted from the light source11is preferably coherent light in which phases are aligned. Generally, the light source11is configured to emit light in a visible light region. Note that the light source11may be configured to emit light in a range other than the visible light region, such as an infrared light region or an ultraviolet light region. Further, the light source11may be a light emitting device other than a laser light source, such as a light emitting diode, an incandescent light bulb, and a discharge tube.

For example, configuring the light source11in such a way that light of a plurality of wavelengths is emitted enables to change a color of display information by changing a wavelength of light to be emitted from the light source11. Further, configuring the light source11in such a way that light of different wavelengths is simultaneously emitted enables to display display information composed of a plurality of colors.

The light source driving power supply12is a power supply for causing the light source11to emit light110by driving the light source11in response to control of the control device20.

The spatial light modulator element13displays a pattern for generating display information to be displayed on each display area on a display part of the own device in response to control of the modulator element control circuit14. In the present example embodiment, light110is radiated onto the display part of the spatial light modulator element13in a state that a predetermined pattern is displayed on the display part. The spatial light modulator element13emits modulated light130acquired by modulating light110toward the projection optical system15.

The spatial light modulator element13is implemented by a phase-modulation-type spatial light modulator element which receives incidence of coherent light110in which phases are aligned, and modulates a phase of the incident light110. Since the phase-modulation-type spatial light modulator element13is focus-free, it is not necessary to change a focal point for each distance, even when light is projected onto a display area set at a plurality of projection distances. Note that, as far as it is possible to display display information on each display area, the spatial light modulator element13may be an element of a type different from a phase modulation type. In the following, however, description is made based on a premise that the spatial light modulator element13is an element of a phase modulation type.

A phase distribution of display information to be displayed on each display area is displayed on a display part of the phase-modulation-type spatial light modulator element13. In this case, modulated light130reflected on the display part of the spatial light modulator element13becomes an image such that a sort of diffraction grating forms an aggregation, and display information is formed in such a way that light diffracted by a diffraction grating is collected.

The spatial light modulator element13is implemented by a spatial light modulator element employing a ferroelectric liquid crystal, a homogeneous liquid crystal, a vertical orientation liquid crystal, or the like, for example. Specifically, the spatial light modulator element13is implementable by a liquid crystal on silicon (LCOS). Further, the spatial light modulator element13may be implemented by a micro electro mechanical system (MEMS), for example.

Employing the phase-modulation-type spatial light modulator element13enables to concentrate energy at a portion of display information by operating the spatial light modulator element13to successively switch a display area to be projected with projected light. Therefore, a phase-modulation-type spatial light modulator element is able to display display information brightly as compared with another method, as far as an output of a light source is the same.

The modulator element control circuit14causes a display part of the spatial light modulator element13to display a pattern for generating display information to be displayed on each display area in response to control of the control device20. When a phase-modulation-type modulator element is driven, the modulator element control circuit14drives the spatial light modulator element13in such a way that a parameter that determines a difference between a phase of light110to be radiated onto a display part of the spatial light modulator element13, and a phase of modulated light130to be reflected on the display part changes.

A parameter that determines a difference between a phase of light110to be radiated onto a display part of the phase-modulation-type spatial light modulator element13, and a phase of modulated light130to be reflected on the display part is, for example, a parameter relating to an optical characteristic such as a refractive index and a light path length. For example, the modulator element control circuit14changes a refractive index of a display part by changing a voltage to be applied to a display part of the spatial light modulator element13. Consequently, light110radiated onto a display part is diffracted based on a refractive index of the display part, as necessary. Specifically, a phase distribution of light110radiated onto the phase-modulation-type spatial light modulator element13is modulated depending on an optical characteristic of a display part. Note that a method for driving the spatial light modulator element13by the modulator element control circuit14is not limited to an example described herein.

The projection optical system15projects modulated light130modulated by the spatial light modulator element13as projected light150. Modulated light130modulated by the spatial light modulator element13is projected as projected light150by the projection optical system15.

The light path switching means30is a portion for switching a light path of light to be projected from the projection device10in response to control of the control device20. Note that a configuration and a layout of the light path switching means30inFIG. 3are an example, and do not limit the scope of the present invention.

The light path switching means30in a state ofFIG. 3deforms the movable part33in response to control of the control device20, and moves the reflecting mirror31between the spatial light modulator element13and the projection optical system15. In the example ofFIG. 3, the movable part33is an expanding/contracting member that expands and contracts in response to control of the control device20. The reflecting mirror31is connected to one end of the movable part33being an expanding/contracting member, and is put in and out of a light path of modulated light130being emitted light from the spatial light modulator element13, accompanied by an expanding/contracting operation of the movable part33.

As illustrated inFIG. 4, when the reflecting mirror31is moved on a route of modulated light130, the modulated light130is reflected on a reflection surface of the reflecting mirror31, and is projected onto a second display area as projected light300. The projected light300projected from the projection device10is displayed on a second display area as display information. Note that, inFIG. 4, nothing is disposed on a light path of projected light300. Alternatively, an optical system may be disposed on a light path of projected light300.

Further, the light path switching means30in a state ofFIG. 4deforms the movable part33in response to control of the control device20, and moves the reflecting mirror31from a position between the spatial light modulator element13and the projection optical system15.

When the reflecting mirror31is deviated from a route of modulated light130, as illustrated inFIG. 3, the modulated light130is incident onto the projection optical system15, and is projected onto a first display area as projected light150. The projected light150projected from the projection device10is displayed on a first display area as display information.

Next, the control device20is described in detail.FIG. 5is a block diagram illustrating a configuration of the control device20of the display system1. As illustrated inFIG. 5, the control device20includes a communication circuit21, a control condition generation circuit22, a storage circuit23, a trigger recognition circuit24, and a light path switching circuit25.

The communication circuit21receives, from a host system (not illustrated) of the display system1, a condition (hereinafter, a display condition) for displaying appropriate display information on each display area at an appropriate timing. The communication circuit21outputs a received display condition to the control condition generation circuit22.

Further, the communication circuit21receives, from the host system, a switching signal for designating switching a display area. The communication circuit21outputs a received switching signal to the trigger recognition circuit24.

The host system analyzes data acquired by a camera or the like, which is set on a moving route of a user who is allowed to see display information. Further, when the host system recognizes the user from the analysis data, the host system transmits, to the display system1, a display condition for displaying display information to be seen by the user on an appropriate display area at an appropriate timing.

Further, the host system generates a switching signal serving as a trigger for switching a display area where display information is displayed. A switching signal may be included in a display condition, or may be generated as a signal different from a display condition.

When the host system determines that it is appropriate to switch a display area from the above-described analysis data, the host system outputs, to the display system1, a switching signal for designating switching a display area. For example, when a user is about to enter a first display area, when projected light150is projected from the display system1onto the first display area, the host system outputs a switching signal to the display system1. Further, when the host system determines that display information is allowed to be displayed on a first display area, the host system outputs, to the display system1, a switching signal for switching a display area where display information is displayed from a second display area to the first display area.

A display condition to be received by the communication circuit21is a condition to be set for displaying appropriate display information at an appropriate timing on a wall or a ceiling nearby a user, based on identification information for identifying a user, position information of a user, a point of time when these pieces of information are acquired, and the like. Identification information is information capable of identifying a user, such as a name and an identification (ID) of a user. Position information is information indicating a position of a user in terms of a two-dimensional coordinate system or a three-dimensional coordinate system. A moving direction and a speed of a user are a moving direction and a speed of a user in motion. Further, a display condition may be set based on information such as a moving direction and a speed of a user, and a destination.

The control condition generation circuit22acquires, from the storage circuit23, a basic pattern constituting a pattern to be displayed on each display area, based on a display condition acquired from the communication circuit21. The control condition generation circuit22generates a pattern to be displayed on a display part of the spatial light modulator element13by moving or combining a basic pattern stored in the storage circuit23. Note that, when the spatial light modulator element13is constituted of a phase-modulation-type element, a pattern with which desired display information is displayed on each display area is a phase distribution associated with the display information.

The control condition generation circuit22generates a control condition for projecting an acquired pattern onto an appropriate display area at an appropriate timing, and outputs the generated control condition to the projection device10. A control condition includes a light source control condition and a modulator element control condition to be described later.

The control condition generation circuit22generates a light source control condition indicating at which timing and what degree of output of light is output from the light source11. A light source control condition is a condition for controlling a timing at which the light source11emits light, and corresponds to a condition for controlling a timing at which desired display information is projected. The control condition generation circuit22outputs, to a light source driving power supply of the projection device10, a generated light source control condition.

Further, the control condition generation circuit22generates a modulator element control condition indicating at which timing and what pattern is displayed on a display part of the spatial light modulator element13. A modulator element control condition is a condition for displaying a pattern associated with desired display information on a display part of the spatial light modulator element13at an appropriate timing. A timing at which a pattern associated with desired display information is displayed on a display part of the spatial light modulator element13is synchronized with a driving timing of the light source11included in a light source control condition. The control condition generation circuit22outputs, to the modulator element control circuit14of the projection device10, a generated modulator element control condition.

A basic pattern constituting a pattern for displaying desired display information on each display area is stored in the storage circuit23. For example, a basic pattern generated by a host system may be acquired in advance, and may be stored in the storage circuit23. A number of display patterns to be stored in the storage circuit23becomes finite, when a number of pieces of information to be displayed on each display area is small. Therefore, it is possible to reduce a capacity of the storage circuit23. Note that not only a basic pattern, but also any pattern may be stored in the storage circuit23.

When a switching signal is included in a display condition received by the communication circuit21, the trigger recognition circuit24outputs a switching operation signal for operating the light path switching circuit25in response to the switching signal. Note that the trigger recognition circuit24may be omitted, and it may be configured in such a way that a switching signal is directly output from the communication circuit21to the light path switching circuit25.

The light path switching circuit25deforms the movable part33of the light path switching means30in response to an acquired switching operation signal. In the example ofFIG. 3, the light path switching circuit25expands and contracts the movable part33of the light path switching means30in response to an acquired switching operation signal. For example, the light path switching circuit25expands the movable part33as illustrated inFIG. 4, and locates the reflecting mirror31between the spatial light modulator element13and the projection optical system15. Note that the light path switching circuit25may be configured to deform the movable part33in response to a switching signal received from the communication circuit21.

Further, as illustrated inFIG. 4, when receiving a switching operation signal in a state that the reflecting mirror31is located between the spatial light modulator element13and the projection optical system15, the light path switching circuit25deforms the movable part33to contract the movable part33. In this way, as illustrated inFIG. 3, the light path switching circuit25prevents the reflecting mirror31from being located between the spatial light modulator element13and the projection optical system15.

Herein, a hardware configuration for implementing a control system of a display system according to the present example embodiment is described usingFIG. 6. Note that a control system200inFIG. 6is an example of a control system for implementing a display system of the present example embodiment, and does not limit the scope of the present invention.

As illustrated inFIG. 6, the control system200includes a processor201, a main storage device202, a sub storage device203, an input-output interface205, and a network adaptor206. The processor201, the main storage device202, the sub storage device203, the input-output interface205, and the network adaptor206are connected to one another via a bus209to enable data transmission and reception. Further, the processor201, the main storage device202, the sub storage device203, and the input-output interface205are connected to a network such as the Internet or an intranet via the network adaptor206. The control system200is connected to a server of a host system or a computer via a network, and information for projecting display information is acquired from the host system.

The processor201is a central processing unit that expands a program stored in the sub storage device203or the like within the main storage device202, and executes the expanded program. In the present example embodiment, the processor201may be configured to employ a software program installed in the control system200. The processor201performs arithmetic processing and control processing to be executed by the control device20.

The main storage device202has an area where a program is expanded. The main storage device202may be a volatile memory such as a dynamic random access memory (DRAM), for example. Further, a non-volatile memory such as a magnetoresistive random access memory (MRAM) may be configured/added as the main storage device202.

The sub storage device203is a means for storing data such as a phase distribution of display information. The sub storage device203is constituted of a local disk such as a hard disk or a flash memory. Note that the sub storage device203may be omitted by configuring in such a way that a phase distribution of display information is stored in the main storage device202.

The input-output interface205is a device for connecting between the control system200and peripheral equipment, based on a connection standard between the control system200and the peripheral equipment. The network adaptor206is an interface for connection to a network such as the Internet and an intranet, based on a standard or a specification. Note that, inFIG. 6, an interface is abbreviated as an I/F. The input-output interface205and the network adaptor206may be standardized an interface to be connected to external equipment.

The control system200may be configured to be connectable to input equipment such as a keyboard, a mouse, and a touch panel, as necessary. These pieces of input equipment are employed for input of information and settings. Note that, when a touch panel is employed as input equipment, a display screen of display equipment may also serve as an interface of the input equipment. Data transmission and reception between the processor201and input equipment may be mediated via the input-output interface205.

The network adaptor206is connected to a host system such as another computer or a server through a network. A host system transmits, to the control system200, a phase distribution of display information to be employed in each example embodiment via the network adaptor206. A host system may generate a phase distribution of display information to be employed in each example embodiment by the own device, or may be acquired from another device.

Further, the control system200may include display equipment for displaying information. When display equipment is included, the control system200may preferably include a display control device (not illustrated) for controlling display of the display equipment. Display equipment may be connected to the control system200via the input-output interface205.

Further, the control system200may include a reader/writer, as necessary. A reader/writer is connected to the bus209. A reader/writer mediates reading of data/program from a recording medium, writing of a processing result of the control system200in a recording medium, and the like between the processor201and an unillustrated recording medium (program recording medium). A recording medium may be implemented by, for example, a semiconductor recording medium such as a secure digital (SD) card, and a universal serial bus (USB) memory. Further, a recording medium may be implemented by a magnetic recording medium such as a flexible disk, an optical recording medium such as a compact disc (CD) and a digital versatile disc (DVD), or another recording medium.

Next, details of the projection optical system15of the projection device10are described usingFIGS. 7 and 8.

FIG. 7is a conceptual diagram of a configuration including the projection optical system15of the projection device10.FIG. 8is a conceptual diagram illustrating another state of the configuration including the projection optical system15of the projection device. InFIGS. 7 and 8, light emitted from the light source11is converted into light110in which phases are aligned by a collimator111.

As illustrated inFIGS. 7 and 8, the projection optical system15includes a Fourier transform lens151, an aperture152, and a projection lens153.

The Fourier transform lens151is an optical lens for forming, at a focal point nearby, an image to be formed when modulated light130reflected on a display part of the spatial light modulator element13is projected to infinity. InFIGS. 7 and 8, a focal point is formed at a position of the aperture152.

The aperture152has a function of blocking high-order light included in light collected by the Fourier transform lens151, and specifying a display area. Specifically, the aperture152blocks a part of light collected by the Fourier transform lens151. An opening portion of the aperture152is opened with a size smaller than an outermost periphery of a display area at a position of the aperture152, and is set in such a way as to block a peripheral area of display information at the position of the aperture152. For example, an opening portion of the aperture152is formed into a rectangular shape or a circular shape. The aperture152is preferably set at a focal point position of the Fourier transform lens151. However, as far as it is possible to exhibit a function of cancelling high-order light, the aperture152may be deviated from a focal point position.

The projection lens153is an optical lens for enlarging and projecting light that is collected by the Fourier transform lens151and passes through the aperture152. The projection lens153projects projected light150onto the reflecting mirror31in such a way that display information associated with a phase distribution input to the spatial light modulator element13is displayed on each display area.

When the display system1is employed for the purpose of projecting a line drawing such as a simple symbol, projected light150projected from the projection optical system15is not uniformly projected onto each display area, but is intensively projected onto a portion such as a character, a symbol, and a frame constituting display information. In this case, the display system1substantially reduces an emission amount of light110. Therefore, it is possible to suppress an entire output of light. Specifically, the display system1is constituted of the compact and low-electric-power light source11, it is possible to lower an output of the light source driving power supply12for driving the light source11, and possible to reduce entire electric power consumption.

In the example ofFIGS. 7 and 8, the reflecting mirror31is configured to move at a position in front of the Fourier transform lens151. The light path switching circuit25deforms the movable part33in response to control of the control device20, and locates the reflecting mirror31on a route of projected light150.

In the example ofFIGS. 7 and 8, an incident angle of light110is made non-orthogonal to a display part of the spatial light modulator element13. Specifically, in the present example embodiment, an emission axis of light110from the light source11is made oblique to a display part of the spatial light modulator element13. Setting an emission axis of light110oblique to a display part of the spatial light modulator element13enables to improve efficiency, since it is possible to cause the light110to be incident onto a display part of the spatial light modulator element13without employing a beam splitter.

Note that, in the example ofFIG. 8, it is assumed that by inserting the reflecting mirror31on a light path of modulated light130, projected light300is projected onto a display area at a position where light reaches a Fraunhofer region, and display information is displayed on the display area. As far as an area is a display area at a position where light reaches a Fraunhofer region, it is possible to project display information focus freely without the Fourier transform lens151. Also in the following, when projected light300is projected without the Fourier transform lens151, it is assumed that display information is displayed on a display area at a position where light reaches a Fraunhofer region.

Installation Example

Next, a configuration example of a device in which the display system1is installed is described usingFIGS. 9 and 10. Note that it is assumed that reference numbers omitted inFIGS. 9 and 10denote elements similar to those inFIGS. 7 and 8.

FIG. 9is an example in which an optical system and the light path switching means30of the display system1are installed in a housing indicated by a broken-line frame. Similarly toFIG. 7, light emitted from a light source is radiated onto a display part of the spatial light modulator element13by being converted into light110in which phases are aligned by the collimator111. The spatial light modulator element13emits modulated light130acquired by modulating the radiated light110toward the Fourier transform lens151. Light via the Fourier transform lens151is projected onto a first display area as projected light150by the projection lens153.

FIG. 10illustrates a state after a switching operation signal is input to the light path switching circuit25in a state ofFIG. 9, and the movable part33is operated. When the movable part33is operated, the reflecting mirror31is inserted between the spatial light modulator element13and the Fourier transform lens151. The reflecting mirror31reflects modulated light130modulated by a display part of the spatial light modulator element13toward a second display area different from a first display area. Light reflected by the reflecting mirror31is projected onto the second display area as projected light300.

In a normal condition, the display system1projects projected light150onto a first display area, as illustrated inFIG. 9. At this occasion, it is assumed that a user moves to a position (first display area) where the user is radiated with projected light150from the display system1. A host system outputs a switching signal in such a way that projected light150is not continued to be projected, when a user is located in a first display area.

When receiving a switching signal from a host system, the display system1switches in such a way that projected light300is projected onto a second display area, as illustrated inFIG. 10, while using the signal as a trigger. As far as the display system1is in a state ofFIG. 10, there is no likelihood that projected light300from the display system1is radiated onto a user.

Conversely, a user may move to a second display area in a state ofFIG. 10. In this case, the host system outputs a switching signal in such a way that projected light300is not continued to be projected, as far as a user is located in a second display area.

When receiving a switching signal from the host system, the display system1switches in such a way that projected light150is projected onto a first display area, as illustrated inFIG. 9, while using the signal as a trigger. As far as the display system1is in a state ofFIG. 9, there is no likelihood that projected light150from the display system1is radiated onto a user.

Modification Example

FIG. 11is a conceptual diagram including a configuration of a modification example of the projection device10.FIG. 12is a conceptual diagram illustrating another state of the modification example of the projection device10. The modification example is different from the configuration ofFIG. 7in a mechanism for changing a position of a reflecting mirror31.

In the modification example, a side of the reflecting mirror31is held by a rotatable movable part35(also referred to as a rotating member). In a state ofFIG. 11, the reflecting mirror31is not located on a light path of modulated light130emitted from a spatial light modulator element13. At this occasion, a display system1projects projected light150onto a first display area.

When receiving a switching signal, a light path switching circuit25rotates the movable part35clockwise by about 45 degrees. At this occasion, as illustrated inFIG. 12, the reflecting mirror31is moved on a light path of modulated light130, and the display system1projects projected light300onto a second display area.

Specifically, in the present modification example, the movable part35is a rotating member which rotates in response to control of a control device20. The reflecting mirror31is put in and out of a light path of modulated light130being emitted light from the spatial light modulator element13, accompanied by a rotating operation of the movable part35being a rotating member.

Note that the above-described movable part is an example, and the present example embodiment is not limited to the above-described shape and structure.

Application Example

FIGS. 13 and 14are an application example in which the display system1is installed in a passage. In the example ofFIGS. 13 and 14, the display system1is installed on a wall surface at an end of a passage.

In the example ofFIG. 13, the display system1displays display information (arrow) for guiding a user to a display area150A at or about a middle of a passage. When a user is guided to display information displayed on the display area150A, the user is supposed to pass the display area150A. When the user reaches the display area150A in a state that display information is projected on the display area150A, light may be radiated onto the user.

In the present application example, an unillustrated camera or sensor grasps a position and a state of a user to be guided. Then, as illustrated inFIG. 14, the display area is switched to a display area300A on a wall surface at an end of the passage, before the user reaches the display area150A.

By controlling as described above, a user will not be radiated with light, even when the user reaches the display area150A. Further, a user can watch display information without visibility changing, even when display information is switched from the display area150A to the display area300A.

As described above, the display system of the present example embodiment is able to switch display information to be projected onto another display area, when a user enters a certain display area. Therefore, a display system of the present example embodiment enables to operate safely in various installation locations such as near a ceiling and near a floor. A display system of the present example embodiment is able to project display information onto any display area easily seen by a user. Specifically, a display system of the present example embodiment enables to provide a display system for displaying easily-seen display information toward any display area, without selecting an installation location.

Further, a display system of the present example embodiment switches to display all pieces of display information on another display area, when a display area where display information is displayed is switched. Therefore, the present example embodiment enables to display display information of higher resolution on another display area, as compared with a case where a part of a display area is switched to another display area.

Second Example Embodiment

Next, a display system according to a second example embodiment of the present invention is described with reference to the drawings. The present example embodiment is different from the first example embodiment in a point that a projection direction changing mirror40for reflecting projected light300projected onto a second display area in a different direction is included. Note that the projection direction changing mirror40may be set on a light path of projected light150projected onto a first display area.

FIG. 15is a conceptual diagram of a configuration including an optical system of a display system according to the present example embodiment.FIG. 16is a conceptual diagram illustrating another state of the configuration including the optical system of the display system according to the present example embodiment.

As illustrated inFIG. 15, a display system in the present example embodiment includes the projection direction changing mirror40. As illustrated inFIG. 16, the projection direction changing mirror40is disposed on a light path of projected light300reflected by a reflecting mirror31. Projected light400reflected by the projection direction changing mirror40is projected in a direction (third display area) different from a second display area where projected light300is displayed.

Note that the projection direction changing mirror40may have a shape and a configuration different from the example ofFIGS. 15 and 16. Combining a plurality of mirrors enables to further increase projection directions of projected light400.

FIGS. 17 and 18are a configuration example of a device in which a display system in the present example embodiment is installed. Note that reference numbers omitted inFIGS. 17 and 18denote elements similar to those inFIGS. 9 and 10.

Similarly toFIG. 9,FIG. 17is an example in which an optical system, a light path switching means30, and the projection direction changing mirror40of a display system are installed in a housing indicated by a broken-line frame. Similarly toFIG. 7, light emitted from a light source is radiated onto a display part of a spatial light modulator element13by being converted into light in which phases are aligned by a collimator111. The spatial light modulator element13emits modulated light130acquired by modulating the radiated light110toward a Fourier transform lens151. Light went through the Fourier transform lens151is projected onto a first display area as projected light150by a projection lens153.

FIG. 18illustrates a state after a switching operation signal is input to a light path switching circuit25in a state ofFIG. 17, and a movable part33is operated. When the movable part33is operated, the reflecting mirror31is inserted between the spatial light modulator element13and the Fourier transform lens151. The reflecting mirror31reflects modulated light130modulated by a display part of the spatial light modulator element13toward a second display area which is different from a first display area. Light reflected by the reflecting mirror31is projected onto the second display area as projected light300. Further, the projected light300is projected as projected light400in a direction different from the second display area by the projection direction changing mirror40.

In the example ofFIG. 18, for example, projected light400is projected onto a foot end or the like. As illustrated in the example ofFIG. 10, when the projection direction changing mirror40is not disposed, projected light300is projected downward. The example ofFIG. 10is appropriate for projecting display information onto a floor surface. Contrary to this, in the example ofFIG. 18, projected light400is projected from below to another direction. Therefore, the example ofFIG. 18is not appropriate for a floor surface itself, but is appropriate for projection onto a wall surface or the like near a floor surface.

As described above, the present example embodiment enables to project light projected onto a second display area to another different direction.

Third Example Embodiment

Next, a display system3according to a third example embodiment of the present invention is described with reference to the drawings. The present example embodiment is different from the first example embodiment in a point that an imaging device50for capturing one of display areas is included.

FIG. 19is a conceptual diagram illustrating a configuration of the display system3in the present example embodiment. Further,FIG. 20is a conceptual diagram illustrating another state of the configuration of the display system3according to the present example embodiment. The display system3includes an imaging device50, in addition to a projection device10and a control device20. Similarly to the display system1in the first example embodiment, the projection device10of the display system3projects projected light150onto a first display area in response to control of the control device20, and projects projected light300onto a second display area.

The display system3in the present example embodiment is different from the display system1in the first example embodiment in a point that the imaging device50is included. The imaging device50is configurable as a general camera.

FIG. 21is a block diagram illustrating a configuration of the imaging device50. As illustrated inFIG. 21, the imaging device50includes an imaging element51, an image processing processor53, an internal memory55, and an output circuit57.

The imaging element51is an element for capturing a predetermined imaging area including a first display area and a second display area, and acquiring imaging data of the imaging area, for example. The imaging element51is a photoelectric conversion element formed by fabricating semiconductor components into an integrated circuit. The imaging element51is implementable by a solid-state imaging element such as a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS), for example. Generally, the imaging element51is constituted of an element for capturing light in a visible range. Alternatively, the imaging element51may be constituted of an element capable of capturing/detecting an electromagnetic wave such an infrared ray, an ultraviolet ray, an X-ray, a gamma ray, a radio wave, and a microwave.

The image processing processor53is an integrated circuit for performing image processing such as dark current correction, interpolation operation, color space conversion, gamma correction, aberration correction, noise reduction, and image compression with respect to imaging data captured by the imaging element51. Note that, when image information is output without being processed, the image processing processor53may be omitted.

The internal memory55is a storage element for temporarily storing image information that is not completely processed when image processing is performed by the image processing processor53, and processed image information. Note that image information captured by the imaging element51may be temporarily stored in the internal memory55. The internal memory55may be constituted of a general memory.

The output circuit57outputs image information processed by the image processing processor53to the control device20.

FIG. 22is a block diagram illustrating a configuration of a control device20-3in the present example embodiment. In the control device20-3, an image analysis circuit26is added to the control device20in the first example embodiment.

A communication circuit21acquires image information from the imaging device50. The communication circuit21outputs acquired image information to the image analysis circuit26.

The image analysis circuit26analyzes acquired image information, and verifies whether or not it is necessary to switch a light path depending on the image information. When detecting that a target onto which light is not supposed to be projected enters an image, the image analysis circuit26generates a switching signal. For example, when detecting a detection target such as a person within an image, the image analysis circuit26analyzes motion of the target, and calculates a point of time when the target enters a display area. The image analysis circuit26outputs a switching signal to a trigger recognition circuit24synchronously with a timing when a detection target enters the display area. Note that the image analysis circuit26preferably includes a point of time when a detection target enters a display area in a switching signal.

When receiving a switching signal from the image analysis circuit26, the trigger recognition circuit24generates a switching operation signal. The trigger recognition circuit24outputs, to a light path switching circuit25, a switching operation signal synchronously with a timing when a detection target enters a display area during light projection.

When a point of time when a detection target enters a display area is not included in a switching signal, the trigger recognition circuit24may generate a switching operation signal synchronously with receiving a switching signal, and output the switching operation signal to the light path switching circuit25. Further, when a point of time when a detection target enters a display area is included in a switching signal, the trigger recognition circuit24may adjust a timing relating to generation and output of a switching operation signal by the own circuit.

The light path switching circuit25deforms a movable part33of a light path switching means30in response to a switching operation signal, similarly to the display system1in the first example embodiment.

Application Example

FIGS. 23 and 24are an application example of the display system3. In the example ofFIGS. 23 and 24, the display system3is installed on a wall surface at an end of a passage.

In the example ofFIG. 23, the display system3displays, on a display area150B at or about a middle of a passage, display information (arrow) for guiding a user. When being guided to display information displayed on the display area150B, a user is supposed to pass the display area150B. If a user reaches the display area150B in a state that display information is projected on the display area150B, the user may be radiated with light.

In the present application example, the imaging device50grasps a position and a state of a user to be guided. Then, as illustrated inFIG. 24, a display area is switched to a display area300B on a wall surface at an end of a passage, before the user reaches the display area150B.

By controlling as described above, a user will not be radiated with light, even when the user reaches the display area150B. A user can watch display information without visibility changing, even when display information is switched from the display area150B to the display area300B.

As described above, the display system of the present example embodiment is able to switch display information to be projected onto another display area, when a user enters a certain display area. Therefore, it is possible to provide a display system for displaying easily-seen display information on any display area even in a condition that communication with a host system is disabled.

Fourth Example Embodiment

Next, an interface device according to a fourth example embodiment of the present invention is described with reference to the drawings. An interface device in the present example embodiment is a device including the display system3in the third example embodiment, and is one example embodiment of a display system of the present invention.

FIG. 25is a conceptual diagram of an interface device4in the present example embodiment.FIG. 26is a conceptual diagram of another state of the interface device4in the present example embodiment.

As illustrated inFIG. 25, a projection device10and an imaging device50are set above the interface device4. A control device20(not illustrated) is set inside the interface device4, and a projection direction changing mirror40is set below the interface device4. The projection device10, the control device20, the projection direction changing mirror40, and the imaging device50of the interface device4have a configuration/function similar to those described in the first to third example embodiments. Further, the interface device4may be connected to an external server or the like by an unillustrated communication function.

An outer side of the interface device4is covered by a housing. At least a part of a front surface (hereinafter, an operation surface60) of the housing of the interface device4is transparent, and functions as a rear-type screen. Further, a lower portion of a lateral surface of the interface device4is transparent or opened. Likewise, at least a part of an upper surface of the housing of the interface device4is transparent or opened for projecting display information onto a ceiling.

A user interface is displayed, by projected light from the projection device10, as display information in an operation area600D included in the operation surface60of the interface device4. In the operation area600D, projected light projected from a rear side is diffused and displayed. Note that, the example ofFIG. 25illustrates that projected light is projected from the projection device10onto the operation area600D. Alternatively, the operation area600D may be constituted of a transparent touch panel display.

The projection device10projects projected light onto a display area150D of a ceiling. The display area150D corresponds to a first display area.

FIG. 26illustrates a state that an area to be projected with projected light is switched to a display area400D. The display area400D corresponds to a second display area. In the example ofFIG. 26, a reflection surface of the projection direction changing mirror40is disposed in such a way that projected light to be projected from the projection device10is reflected toward the display area400D. Projected light projected from the projection device10is guided to the reflection surface of the projection direction changing mirror40, after a light path is switched by an unillustrated light path switching means. The projected light guided to the reflection surface of the projection direction changing mirror40is reflected on the reflection surface of the projection direction changing mirror40, and display information is displayed on the display area400D.

FIG. 27is a block diagram illustrating a configuration of a control device20-4in the present example embodiment. The control device20-4in the present example embodiment has a configuration in which an operation recognition circuit27is added to the control device20-3in the third example embodiment.

The operation recognition circuit27acquires image information from a communication circuit21, and recognizes an operation content by a user by analyzing the acquired image information. Then, the operation recognition circuit27selects an action associated with the operation content, and outputs, to a control condition generation circuit22, a display condition of display information associated with the action.

The control condition generation circuit22selects an associated pattern from a storage circuit23in accordance with a display condition of the operation recognition circuit27, and outputs the selected pattern to a modulator element control circuit14of the projection device10.

The modulator element control circuit14controls a spatial light modulator element13, based on an input pattern, and changes display information to be displayed in the operation area600D, the display area150D, or the display area400D from the spatial light modulator element13.

For example, the operation recognition circuit27determines an operation position designated on the operation area600D by a user at a certain point of time, and generates operation position information in which the point of time is associated with the determined operation position. Specifically, the operation recognition circuit27analyzes image information captured by the imaging device50, and determines an operation position designated by a user in the operation area600D. Then, the operation recognition circuit27generates operation position information in which the point of time when the user designates the operation position, and the operation position are associated. For example, setting an orthogonal coordinate system in the operation area600D allows for the operation recognition circuit27to convert a determined operation position into coordinates of the orthogonal coordinate system.

An action associated with an operation on an interface displayed in the operation area600D may be stored in the storage circuit23in the form of a table. For example, an identification (ID) of an interface, an operation position on the interface, and an action associated with the operation position may be stored in the storage circuit23in the form of a table. Processing of determining an operation position on an interface corresponds to determining an operation content performed with respect to the interface. Further, processing of selecting an action associated with an operation position on an interface corresponds to reacting from a device side with respect to an operation content performed with respect to an interface. For example, it may be sufficient that displaying specific display information in the operation area600D with respect to a certain operation content is selected as an action.

Herein, the foregoing description is summarized. The interface device4includes the transparent operation surface60on which display information acquired by diffusing projected light is displayed. The projection device10displays, in the operation area600D of the operation surface60, a user interface by projecting projected light onto the operation surface60. The imaging device50captures the operation area600D where a user interface is displayed. The control device20-4recognizes an operation content with respect to a user interface by associating an operation content with respect to a user interface captured by the imaging device50, and an operation key set in the user interface. The control device20-4controls the projection device10in such a way that display information according to an operation content is displayed on one of display areas.

In this way, the interface device4enables an interactive operation by displaying associated display information in response to an operation content of a user.

Herein, an application example of the interface device4in the present example embodiment is described usingFIGS. 28 to 30.FIGS. 28 to 30illustrate an example in which a user using the interface device4is guided to the interface device4(FIG. 28), operates the interface device4(FIG. 29), and is guided in accordance with display information indicated by the interface device4(FIG. 30).

InFIG. 28, the interface device4displays display information “WELCOME” on the display area150D (corresponding to a first display area) of a ceiling. Further, the interface device4displays display information “Please touch” in the operation area600D of the operation surface60. In the example ofFIG. 28, a user is guided to the interface device4, while being guided by information “WELCOME” displayed on the display area150D.

The interface device4switches a projection direction of projected light in response to a position and an operation of a user. For example, the interface device4is set in such a way as to switch a projection direction, when a user enters a position where the user can see the operation area600D, when the user waves his/her hand toward the interface device4, or when the user touches the operation area600D.

FIG. 29is a conceptual diagram illustrating a state that a user is operating the interface device4. The interface device4displays a specific interface screen during a period when a user is operating. For example, in a hotel, the interface device4may display, in the operation area600D, an interface screen relating to a room, a restaurant, a shop, a spa, a play facility, a sightseeing spot nearby, and the like.

At this occasion, since it is not necessary to display display information on the display area150D of a ceiling, the interface device4may switch a projection direction of projected light to a display area400D (corresponding to a second display area). InFIG. 29, the interface device4displays, on the display area400D, display information “In Operation”. When a user acquires information by operating the interface device4, the user may act based on the acquired information. For example,FIG. 29assumes that a user is searching for a room where the user would like to stay or a facility that the user would like to use.

The interface device4is able to recognize an operation content of a user by analyzing imaging data of the imaging device50or motion of the user by a touch panel function of the operation surface60. For example, the interface device4recognizes an operation content of a user by associating a content being projected at a certain position on the operation area600D, and an operation position and motion of a user.

FIG. 30is a conceptual diagram illustrating a state that a user who finishes using the interface device4is moving to a destination, while being guided by display information (arrow) displayed on the display area400D. InFIG. 30, the interface device4displays, in the operation area600D, display information “Good-bye”. When a user leaves, the interface device4may switch a projection direction of display information, as illustrated inFIG. 28.

In the application example ofFIGS. 28 to 30, a switching timing of a projection direction of light may differ from the above-described description.

For example, display information may not be displayed on the operation surface60in the condition ofFIG. 28, and display information may be displayed on the operation surface in accordance with the condition ofFIG. 29. Further, in a condition in which a user is approaching the interface device4, display information may be displayed on a display area in front of the interface device4, and display information may be switched to the operation area600D synchronously with a timing when the user enters the display area. Further, display information may not be displayed on the display area150D of a ceiling, and an area where display information is displayed may be switched between the operation area600D and the display area400D.

FIG. 31is an example (interface device4-2) in which a width of the interface device4is narrowed. The interface device4-2inFIG. 31is a configuration example having a function of switching between projection onto a ceiling, and projection onto a foot end wall, without forming an operation area600D. Note that, since an internal configuration of the interface device4-2inFIG. 31is similar to the interface device4except that projected light is not projected onto the operation area600D, detailed description of the interface device4-2is omitted. Since the interface device4-2inFIG. 31does not include a conspicuous configuration like the operation area600D, and a width of the interface device4-2is narrow, it is possible to implement a less noticeable appearance as compared with the interface device4inFIGS. 28 to 30.

As described above, the interface device of the present example embodiment is able to switch a direction of projecting display information depending on a user's condition. Therefore, the interface device of the present example embodiment is able to display easily-seen display information on a desired display area. Further, the interface device of the present example embodiment enables an interactive operation by a user.

Fifth Example Embodiment

Next, a display system according to a fifth example embodiment of the present invention is described with reference to the drawings. A display system in the present example embodiment includes a mechanism for removing zero-order light included in modulated light130in the first to fourth example embodiments.

FIG. 32is an example in which a mechanism for removing zero-order light is added in the example ofFIG. 7. The example ofFIG. 32is an example in which a light absorbing material154(also referred to as a light absorbing member) for absorbing zero-order light is disposed on a light path of zero-order light. InFIG. 32, a transparent window member155is disposed in an opening portion of an aperture152, and the light absorbing material154is disposed on an outer surface or inside the window member155. Configuring as illustrated inFIG. 32enables to remove zero-order light by the light absorbing material154.

FIG. 33is an example in which a mechanism for removing zero-order light330is added to the example ofFIG. 8. The example ofFIG. 33is a configuration example in which the light absorbing material154for absorbing zero-order light330is disposed on a light path of the zero-order light330, and a reflecting mirror310including an opening portion311(also referred to as a through-hole) is disposed on a light path of the zero-order light330.FIG. 33is an example in which the reflecting mirror310is located on a light path of modulated light130. In the example ofFIG. 33, zero-order light330passes through the opening portion311, and is absorbed by the light absorbing material154. Therefore, zero-order light330will be removed from projected light300.

FIG. 34is an example in which a mechanism for removing zero-order light330is added in the example ofFIG. 16. The example ofFIG. 34is a configuration in which a gap is formed in a part of a projection direction changing mirror40, and zero-order light330is allowed to pass through the gap. The configuration ofFIG. 34is an example in which zero-order light330passes through a gap of the projection direction changing mirror40, and is absorbed by a light absorbing member41.

As described above, the display system according to the present example embodiment enables to remove zero-order light which may be included in projected light. Note that the above-described configurations ofFIGS. 32 to 34may be combined as necessary.

Herein, a use scene of display systems according to the first to fifth example embodiments of the present invention is described by employing the interface device4-2inFIG. 31, as an example.

FIG. 35is an example in which display information is projected onto a wall surface by a projector1000installed within a building such as hotel. A portion on a left side of the arrow illustrates an example in which display information is projected onto a foot end in a normal condition. A user of a hotel and the like recognizes display information displayed on a wall surface, and easily reaches a destination.

A portion on a right side of the arrow illustrates a state that display information cannot be displayed on a desired wall surface from the projector1000, when a fire breaks out. When a fire breaks out, display information for guiding a user to evacuate outdoors is desired to be displayed on a wall surface. However, when the projector1000is employed, it is not possible to display display information at a desired position due to smoke.

FIG. 36is an example in which the interface device4-2inFIG. 31is employed. Employing the interface device4-2enables to display display information on the display area150D of a ceiling in a normal condition (left side), and switch to display display information on the display area400D at a foot end in an emergency situation such as a fire (right side). In this way, in a method of example embodiments of the present invention, even in a condition that smoke is generated indoors by a fire, it is possible to guide a user to an appropriate destination.

In the foregoing, the present invention is described by using the above-described example embodiments as an exemplary example. The present invention, however, is not limited to the above-described example embodiments. Specifically, the present invention is applicable to various aspects comprehensible to a person skilled in the art within the scope of the present invention.

A part or the entirety of the above-described example embodiments may be described as follows, but is not limited to the following configuration.

A display system including:

a projection device that switches and projects emitted light from a spatial light modulator element onto a plurality of display areas; and

a control device that controls the projection device to switch a projection direction of projected light, based on a display condition of display information to be displayed on the plurality of display areas, wherein

the projection device includes

a reflecting mirror that is put in and out of a light path of emitted light from the spatial light modulator element, and

a light path switching means that switches a projection direction of projected light by putting the reflecting mirror in and out of a light path of emitted light from the spatial light modulator element in response to control of the control device.

The display system according to supplementary note 1, wherein

the projection device includes

a light source that emits light toward a display part of the spatial light modulator element, and

a projection optical system that projects emitted light from the spatial light modulator element toward a first display area, and

the reflecting mirror reflects emitted light from the spatial light modulator element toward a second display area, when the reflecting mirror is put in a light path of emitted light from the spatial light modulator element.

The display system according to supplementary note 2, wherein

the light path switching means includes a movable part that deforms in response to control of the control device, and

the reflecting mirror is connected to the movable part, and is put in and out of a light path of emitted light from the spatial light modulator element, accompanied by deformation of the movable part.

The display system according to supplementary note 3, wherein

the movable part is an expanding/contracting member that expands and contracts in response to control of the control device, and

the reflecting mirror is connected to one end of the expanding/contracting member, and is put in and out of a light path of emitted light from the spatial light modulator element, accompanied by an expanding/contracting operation of the expanding/contracting member.

The display system according to supplementary note 3, wherein

the movable part is a rotating member that is rotated in response to control of the control means, and

the reflecting mirror is connected to the rotating member, and is put in and out of a light path of emitted light from the spatial light modulator element, accompanied by a rotating operation of the rotating member.

The display system according to any one of supplementary notes 2 to 5, wherein

the reflecting mirror is put in and out between the spatial light modulator element and the projection optical system.

The display system according to any one of supplementary notes 2 to 5, wherein

the projection optical system includes

a Fourier transform lens that collects emitted light from the spatial light modulator element,

an aperture disposed at a post stage of the Fourier transform lens, and configured to block a part of light included in light collected by the Fourier transform lens, and

a projection lens disposed at a post stage of the aperture, and configured to enlarge and project light that passes through the aperture, and

the reflecting mirror is put in and out between the spatial light modulator element and the Fourier transform lens.

The display system according to any one of supplementary notes 1 to 7, wherein

the control device includes a communication circuit that receives, from a host system, a switching signal for switching a display area where projected light is projected, and

the control device controls the light path switching means in response to the switching signal.

The display system according to any one of supplementary notes 1 to 8, wherein

the spatial light modulator element is of a phase modulation type.

The display system according to any one of supplementary notes 2 to 9, further including

a projection direction changing mirror disposed on a light path of light reflected by the reflecting mirror, and configured to reflect light reflected by the reflecting mirror toward a third display area.

The display system according to any one of supplementary notes 1 to 10, further including

an imaging device that captures a region including at least one of display areas.

The display system according to supplementary note 11, wherein

the control device analyzes imaging data captured by the imaging device, and when a detection target is detected in a display area where display information is being displayed, the control device controls the light path switching means in such a way as to switch a projection direction of projected light.

The display system according to supplementary note 11 or 12, further including

a transparent operation surface on which projected light projected from the projection device is diffused and displayed, wherein

the projection device displays a user interface by projecting projected light onto an operation area of the operation surface,

the imaging device captures an operation area where the user interface is displayed, and

the control device recognizes an operation content with respect to the user interface by associating an operation position with respect to the user interface captured by the imaging device, with an operation key set on the user interface, and controls the projection device in such a way as to display display information according to the operation content on one of the display areas.

The display system according to any one of supplementary notes 1 to 13, wherein

a light absorbing member is disposed on a light path of zero-order light included in emitted light from the spatial light modulator unit.

The display system according to supplementary note 14, wherein

a through-hole is formed in the reflecting mirror on a light path of zero-order light included in emitted light from the spatial light modulator element.

The display system according to supplementary note 10, wherein

a through hole is formed in the projection direction changing mirror on a light path of zero-order light included in emitted light from the spatial light modulator element reflected by the reflecting mirror.

REFERENCE SIGNS LIST