JP7159786B2 - Projection system and its usage - Google Patents

Description

The present invention relates to a projection system that displays an image by projecting image light onto a screen using a projector, and in particular, it is possible to reflect and transmit the projected image light and display the image on both sides thereof. a projection system and a method of using the same.

Projectors that project images are classified into front projectors and rear projectors. A front projector places a reflective screen by the wall of a room, places a projector unit that includes a liquid crystal display element and a projection lens, etc. in the room, projects image light from the projection lens toward the screen, and displays the image on the screen. indicate. The viewer sees the image reflected on the screen. On the other hand, a rear projector has a projector unit arranged inside a box-shaped space such as a room, and is further provided with a transmissive screen. The viewer sees the image transmitted through the screen from the outside of the space.

Generally, a projector has a configuration in which a light beam sent from a light source is modulated by an optical modulation element to form an optical image, and the optical image is projected onto a screen by a projection optical system. The luminous flux projected onto the reflective screen is diffused and reflected on the surface of the reflective screen. Thereby, an image can be displayed on the front side of the reflective screen. A light beam projected on a transmissive screen is diffused through the transmissive screen. Thereby, an image can be displayed on the transmissive screen.

In order to allow the projected image to be viewed from both sides of the screen, or to superimpose the projected image on an object behind the screen for viewing, the screen is replaced with a conventional screen. It is proposed to be transparent. In this screen, by projecting a light flux onto the screen, reflected light and transmitted light are generated and can be viewed from both the rear and front sides (for example, Patent Documents 1 and 2).

Patent Literature 1 proposes a screen in which image light is observed from both sides of the hologram screen by combining a transmissive hologram screen with a half mirror. However, since the hologram screen does not have polarization selectivity and cannot distinguish between ambient light and image light, it is difficult to clearly display images under bright ambient light. On the other hand, a screen using a half mirror inevitably has a structure that partially blocks the field of view, and in principle, it is difficult to increase the size of the screen.

The screen of Patent Document 2 uses cholesteric liquid crystals that selectively reflect light of a specific polarization component in order to form a reflective screen. Also, in order to form a transmissive screen, a rear-side diffraction layer that diffracts light transmitted through the reflective screen is used. Therefore, there are the following inconveniences. Since the cholesteric liquid crystal is used for the reflective screen, the directivity of the light incident on the reflective screen is restricted by the optical rotatory power of the liquid crystal. In addition, since the transmissive screen requires a diffraction layer for controlling the direction of light emission, the number of parts increases. Furthermore, the use of the diffraction layer tends to cause uneven brightness on the screen.

In addition, polarizing separation films with a cholesteric liquid crystal structure are highly dependent on the angle of incidence, and the reflection intensity and color reproducibility differ depending on the angle of incidence. When it is large), the front luminance decreases, making it difficult to display a clear image. Also, even with a transmissive screen, the image looks whitish and the definition is low. In addition, since the polarization separation film having a cholesteric liquid crystal structure, which is a circular polarizer, and the absorption polarizer, which is a linear polarizer, are combined, it is necessary to interpose a retardation plate, which increases the number of parts.

Furthermore, the screen of Patent Document 2 is intended to be visible from both the side where the projector is arranged and the side where the projector is not arranged, but ambient light such as external light and illumination light (non-image No consideration is given to the control of the transparency of light), and therefore switching between the visibility of the outside scenery and the interior is not described either.

Japanese Patent No. 3482963 JP 2006-227581 A

The present disclosure has been made in view of the above circumstances, and enables projection to both the front side and the rear side, and also changes the transmittance of non-image light according to user needs, providing diversity. It is an object of the present invention to provide a projection system and its usage method.

In order to solve the above problems, the projection system of the present invention is a projection system comprising a projection unit and a screen,
the screen includes a polarization separation element, and a light control film on one side of the polarization separation element;
the projection unit comprises a polarizer on the screen side of the projector;
The polarizer has a function of switching between a transmission axis that matches the TM polarization axis determined by the polarization separation element and a transmission axis that matches the TE polarization axis determined by the polarization separation element,
The light control film is characterized in that it has a light control layer capable of switching haze (degree of cloudiness) between two or more levels by applying voltage.

Alternatively, the projection system of the present invention is a projection system comprising a projection unit and a screen,
the screen includes a polarization separation element, and light control films are provided on both sides of the polarization separation element;
the projection unit comprises a polarizer on the screen side of the projector;
The polarizer has a function of switching between a transmission axis that matches the TM polarization axis determined by the polarization separation element and a transmission axis that matches the TE polarization axis determined by the polarization separation element,
The light control film is characterized in that it has a light control layer capable of switching haze (degree of cloudiness) between two or more levels by applying voltage.

The projection system and the method of using the projection system of the present invention are characterized in that the screen is provided on a window that separates the indoors from the outdoors or the indoors from the outdoors.

Alternatively, the projection system and the method of using the projection system of the present invention are characterized in that the screen is arranged on a partition that divides the room.

Alternatively, the projection system and the method for using the projection system of the present invention are characterized in that the screen is provided on a window that separates the inside of the vehicle from the outside of the vehicle.

According to the present disclosure, a projection system capable of selective projection to both the front side and the rear side is provided. In addition, the projection system provides a variety of usage methods in which it is possible to change the transparency of the interior and exterior scenes of non-image light according to the user's needs.

FIG. 4A is a conceptual diagram showing the overall configuration and function of the projection system, and FIG. 4B is a conceptual diagram showing the polarization switching plate in (a), according to the first embodiment of the present disclosure; 1 is a schematic diagram showing how the projection system according to the first embodiment of the present disclosure is used as rear projection; FIG. 1 is a schematic diagram showing how the projection system according to the first embodiment of the present disclosure is used as front projection; FIG. FIG. 5 is a schematic diagram showing a mode of using the projection system according to the second embodiment of the present disclosure as rear projection; FIG. 5 is a schematic diagram showing a mode of using the projection system according to the second embodiment of the present disclosure as front projection; FIG. 5 is a schematic diagram showing a mode of simultaneously using the projection system according to the second embodiment of the present disclosure for both rear projection and front projection; FIG. 3 is a schematic cross-sectional view showing the structure and behavior of a normal mode light control film having a PNLC type light control layer. (a) When the power is on and transparent, (b) When the power is on and translucent. FIG. 3 is a schematic cross-sectional view showing the structure and behavior of a normal mode light control film having a PNLC type light control layer. When the power is turned off and the light is shaded. It is a schematic perspective view for explaining the structure and polarization characteristics of a wire grid polarizer.

An embodiment of the projection system of the present disclosure and a method of using the same will be described below with reference to the drawings. Identical components are denoted by the same reference numerals unless there is a reason for convenience. In addition, in the drawings used in the following description, in order to make the features easier to understand, there are cases in which the characteristic parts are shown in an enlarged manner, and the dimensional ratio of each component is not the same as the actual one.

FIG. 1 is a conceptual diagram showing (a) the overall configuration and function of the projection system according to the first embodiment of the present disclosure, and (b) showing the polarization switching plate in (a). It is a conceptual diagram. A projection system 100 according to the first embodiment comprises a projection unit 60 and a screen 40. The screen 40 includes a polarization separation element 30, and one side of the polarization separation element 30 (the side facing the projection unit 60 in FIG. 1) A light control film 10 is provided. The projection unit 60 also has a polarizer 62 on the side of the projector 61 facing the screen 40 . Although not shown, an antireflection film may be provided on the incident side of the light control film 10 .

The polarizer 62 is a linear polarization switchable polarizer having a function of switching between a transmission axis matching the TM polarization axis determined by the polarization separation element 30 and a transmission axis matching the TE polarization axis determined by the polarization separation element. In the case of rear projection (FIG. 2), the image light passes through the TM portion of FIG. 1B, and in the case of front projection (FIG. 3), the TE portion of FIG. Allow light to pass through. The method of switching may be a rotation method (indicated by an arrow) as shown in FIG. 1B, a method of replacing with a dedicated polarizer, or a method of inserting a half-wave plate at the time of switching. Also, as shown by O in FIG. 1B, it may be possible to select not to pass the polarizer. The light control film 10 has a light control layer 13 capable of switching the haze (degree of cloudiness) between two or more levels by applying voltage.

The polarization splitting element 30 is an element that splits the oscillation direction of the electric field of unpolarized light into two directions to transmit light and reflect light, respectively. Brightness Enhancement Film) can be exemplified.

FIG. 9 is a schematic perspective view for explaining the structure and polarization characteristics of a wire grid polarizer. The wire grid polarizer 90 has a structure in which a grid pattern 92 of a metal film such as aluminum is formed on a transparent base material 91 such as a film or glass that is transparent to the wavelength range used, and the grid period is sufficiently larger than the wavelength. By making it smaller, polarized light that transmits TM polarized light 94 whose vibration direction of the electric field is the periodic direction of the grid (Z direction in FIG. 9) and reflects TE polarized light 95 whose vibration direction is the longitudinal direction of the grid (X direction in FIG. 9). element. Although the incident light 93 is incident from the grid pattern 92 side in FIG. 9, the polarization characteristics are the same even if it is incident from the transparent base material side 91 . Japanese Unexamined Patent Application Publication No. 2006-201782 proposes a large-area wire grid polarizer on a plastic substrate and a manufacturing method thereof.

A DBEF is a polarizing element that utilizes the principle of birefringence and the principle of thin film interference by stacking multiple resin thin film layers with different refractive indices. Like a wire grid polarizer, it transmits TM-polarized light and reflects TE-polarized light.
Hereinafter, in the present application, a wire grid polarizer will be described as an example of the polarization separation element 30 .

As the polarizer 62, a polarizer formed by stretching a hydrophilic polymer film such as a polyvinyl alcohol (PVA)-based film by adsorbing iodine or a dichroic dye and stretching it in one direction is used. can be used. In the form of FIG. 1(b), the polarizer is configured as a circular polarizer 62 having two regions with different stretching directions, and by rotating as described above, linearly polarized light is transmitted through the polarizer 62. has a function of switching the polarization axis of the wire grid polarizer so that it coincides with the polarization axis of the TM polarized light or the TE polarized light by the wire grid polarizer.

Examples of the light control film 10 include a liquid crystal type, an electrochromic type, and an SPD (Suspended Particle Device) type. These devices have the common feature that their optical transparency changes with voltage and that the change is reversible.

For example, a liquid crystal type light control film changes the alignment state of the liquid crystal molecules according to the magnitude of the voltage applied to the liquid crystal molecules, and reversibly changes between a cloudy state that scatters light and a transparent state that transmits light. can be changed. The degree of opacity of a light control film is usually called haze, and the light control film 10 used in the projection system of the present disclosure has a light control layer 13 that can switch the haze between two or more levels depending on the applied voltage.

Therefore, the projection system of the present disclosure includes an AC power supply 16 that can apply a voltage to the light control layer 13 that constitutes the screen 40, and a switch 17 that switches whether to apply the voltage from the AC power supply 16. The AC power supply is preferably a variable power supply capable of changing its effective voltage. This is because, as will be described later, the degree of light transmission/scattering can be controlled to vary the haze.

There are several types of polymer liquid crystals used in the light control layer of liquid crystal type light control films. A type called polymer dispersed liquid crystal (PDLC) has been proposed.

There are two types of liquid crystal type light control films: normal mode and reverse mode. FIG. 7 is a schematic cross-sectional view showing the structure and behavior of normal mode light control films 10a and 10b having a PNLC type light control layer. In the PNLC type, liquid crystal molecules 15 are arranged within voids formed inside a three-dimensional network structure called a polymer network 14 . Although not shown, in the PDLC type, a liquid crystal material containing liquid crystal molecules is dispersed in a polymer matrix.

As shown in FIG. 7, the normal mode light control films 10a and 10b include a first transparent film substrate 11a and a second transparent film substrate 11a and a second transparent film substrate 11a and a second transparent film substrate 11a and a light control layer 13 on both sides via transparent electrodes 12a and 12b made of transparent conductive films. It has a structure in which it is held by the film substrate 11b. Although not shown, the reverse mode light control film further includes an alignment film between the light control layer and the transparent electrode, and the response to power on/off is opposite to that of the normal mode light control film.

Hereinafter, in the present application, a liquid crystal type normal mode light control film having a PNLC light control layer will be described as an example of the light control film 10 . The same explanation applies to the PDLC type light control layer.

FIG. 7(a) shows a transparent state with the AC power source 16 turned on, and FIG. 7(b) shows a translucent state with the AC power source 16 turned on. In the light control film 10a of FIG. 7(a), the effective voltage of the AC power supply 16 is high, the liquid crystal molecules 15 are aligned along the electric field, light scattering disappears, and a low haze state occurs, and the incident light 80 is almost unchanged and the transmitted light 81 It has become.

In the light control film 10b of FIG. 7B, the effective voltage of the AC power supply 16 is lower than that of FIG. , reflected scattered light 82 and transmitted scattered light 83 are generated, and the light control film 10b is in a translucent state. In FIG. 7B, for convenience, the transmitted light 81 is shown near the center of the light control film 10b, and the reflected scattered light 82 and the transmitted scattered light 83 are shown together in the peripheral region of the light control film 10b. is not positionally distinguishable, and the transmission component and the scattering component, and the reflection component and the scattering component are evenly distributed, forming diffusely transmitted light and diffusely reflected light, respectively.

FIG. 8 is a schematic cross-sectional view showing the structure of a normal mode light control film having a PNLC type light control layer and behavior different from that shown in FIG. Since no voltage is applied to the light control film 10c in FIG. 8, the liquid crystal molecules are arranged most randomly, the incident light is scattered at the interface between the polymer and the liquid crystal, and almost all of it becomes the reflected scattered light 82, and the light control film 10c is Light is blocked. In the present application, the term "light-shielded state" means a state in which the opposite side of the screen cannot be viewed in the visible light range.

FIG. 2 is a schematic diagram showing how the projection system according to the first embodiment of the present disclosure is used as a rear projection 100-(R). In the rear projection 100-(R) of this embodiment, the transmission axis of the polarization switching plate 62-(TM) is set so as to coincide with the TM polarization axis (Z direction in FIG. 2) determined by the polarization separation element 30. FIG. As a result, non-polarized light emitted from the projector 61 using an LED or the like as a light source becomes TM-polarized light that can pass through the polarization separation element 30 after passing through the polarization switching plate 62-(TM). At this time, since it passes through the semi-transparent light control film 10b before entering the polarization separation element 30, it becomes diffused light containing many components scattered in the YZ plane after passing through the light control film 10b. Light is emitted from the polarization separation element 30, and rear projection using the light control film 10b and the polarization separation element 30 as a screen is realized.

In the rear projection described above, if the voltage of the AC power supply 16 is too low, the transparency of the translucent light control film 10b will be insufficient. Conversely, if the voltage of the AC power supply 16 is too high, the light scattering property of the translucent light control film 10b will be insufficient, and the wide-angle visibility necessary for the screen will be insufficient.

On the other hand, non-image light such as outside light and illumination light is also scattered by the light control film 10b and passes through the polarization separation element 30, but since the non-image light is originally unpolarized, only the TM polarized light that has passed through the polarization switching plate is emitted. is scattered and the ratio of the scattered light is higher than that of the transmitted image light. Therefore, the influence of the haze degree of the light control film 10b is different from that of the image light, and the visibility is also different. This situation is the same when the outside scene on the non-viewing side is seen through in front projection, which will be described later.

From the above, according to the characteristics of the light source and the purpose of use of the rear projection, the effective voltage of the AC power supply is suitably selected, the degree of transmission and scattering of the image light and non-image light is controlled, and the optimum haze degree is , to provide the best contrast between image and non-image light. After passing through the polarization switching plate 62-(TM), only the TM polarized light component remains, so even if it is scattered by the light control film 10b, the TE polarized light component is very small, and the TE reflected light from the polarization splitting element 30 is It becomes a negligible level.

In FIG. 2, the image light enters the polarization separation element 30 after entering the light control film 10b. After that, the light may enter the light control film 10b. As will be described later, when the screens are installed on various windows or the like, as long as the screens are not fixed to the windows, the replacement can be done simply by turning the screens upside down.

FIG. 3 is a schematic diagram showing how the projection system according to the first embodiment of the present disclosure is used as a front projection 100-(F). In the front projection 100-(F) in this embodiment, the transmission axis of the polarization switching plate 62-(TE) is set so as to match the TE polarization axis (X direction in FIG. 2) determined by the polarization separation element 30. FIG. As a result, non-polarized light emitted from the projector 61 using an LED or the like as a light source becomes TE-polarized light that is reflected by the polarization separation element 30 after passing through the polarization switching plate 62-(TE). At this time, since the light passes through the semi-transparent light control film 10b before entering the polarization separation element 30, it becomes diffused light containing many components scattered within the XY plane after passing through the light control film 10b. The light is reflected by the polarization separation element 30, and front projection using the light control film 10b and the polarization separation element 30 as a screen is realized.

In the front projection described above, if the voltage of the AC power supply 16 is too high, the transparency of the translucent light control film 10b will be insufficient. Conversely, if the voltage of the AC power supply 16 is too low, the translucent light control film 10b will be insufficient in scattering properties, and the wide-angle visibility necessary for the screen will be insufficient. Therefore, the effective voltage of the AC power source is suitably selected according to the characteristics of the light source and the intended use of the front projection, and the degree of light transmission/scattering is controlled to obtain the optimum haze degree. After passing through the polarization switching plate 62-(TE), only the TE polarized component is present, so even if the light control film 10b scatters the TM polarized component, the TM polarized component is slight, and the TM transmitted light through the polarization splitter 30 is Very little.

In addition, in the form of FIG. 3, non-image light such as external light and illumination light is also reflected by the polarization separation element 30 and scattered by the light control film. The ratio of scattered light is higher than that of the image light in which only the TE-polarized light that has passed through is reflected and scattered. For this reason, the screen used in the projection system of the present disclosure has a low specularity, and it is possible to reduce reflection of the background on the viewing side, which is often a problem in conventional rear projection.

FIG. 4 is a schematic diagram showing how the projection system according to the second embodiment of the present disclosure is used as a rear projection 200-(R). The screen 50 according to the projection system of the second embodiment differs from the structure of the screen 40 (FIG. 1) according to the projection system of the first embodiment. and an optical film 20 . Also, they are provided with AC power sources 16a and 16b and switches 17a and 17b, respectively.

Therefore, in the rear projection 200-(R) using the projection system according to the second embodiment, in FIG. The diffused light containing many TM polarized components emitted from is further transmitted and scattered by the second light control film 20 . At this time, if the voltage applied to the second light control film 20 is increased to make it transparent like the light control film 10a in FIG. Almost the same diffuse transmitted light 63 in rear projection 100-(R) using such a projection system is obtained.

Conversely, if the voltage applied to the first light control film 10 is increased to make it transparent like the light control film 10a in FIG. 7A, the rear projection 100 using the projection system according to the first embodiment Unlike −(R), the TM polarized light is transmitted and scattered by the second light control film 20 after being incident on and transmitted through the polarization separating element 30 . As described above, by varying the voltage applied to the first light control film 10 and the second light control film 20, various rear projections can be achieved according to the purpose of use.

In addition, in the rear projection of the second embodiment shown in FIG. 4, since the light control film is provided on both sides of the polarization separation element 30, the specularity on the viewing side is also lowered, the reflection of the outside scenery on the viewing side is reduced, and the contrast of the image is reduced. can increase

FIG. 5 is a schematic diagram showing how the projection system according to the second embodiment of the present disclosure is used as a front projection 200-(F). In this example, the switch 17b of the second light control film 20 is turned off to turn off the power, and the second light control film 20 is in a light blocking state like the light control film 10c in FIG. Therefore, the external scene is not visible from the viewing side of the image light, and the image light is not visible from the external scene side.

By placing the second light control film 20 in the light shielding state in the form of FIG. 5, the second light control film 20 can be provided with an infrared cut function to improve cooling efficiency and an ultraviolet cut function.

Furthermore, in the front projection 200-(F) of FIG. 5, the second light control film 20 is in a light blocking state, so even if the TM polarized light is transmitted through the polarization separation element 30, it is blocked by the second light control film 20. , the projection unit does not require a polarization switching plate (62-(TM) in FIG. 4) (or the polarization switching plate is rotated so that the emitted light from the projector passes through the O part in FIG. 1(b). can also be used). Not passing through a polarizer is advantageous in terms of increasing the amount of light.

FIG. 6 is a schematic diagram showing how the projection system according to the second embodiment of the present disclosure is used simultaneously for both rear projection and front projection 200-(RF). In this example, the polarization switching plate (62-(TM) in FIG. 4) is not used in the projection unit (or the polarization switching plate is rotated so that the light emitted from the projector passes through the O part in FIG. 1(b). may be used). Therefore, the TM polarized light that has passed through the polarization separation element 30 becomes diffusely transmitted light 73 , and the TE polarized light reflected by the polarization separation element 30 becomes diffusely reflected light 74 . As a result, it is possible to use the projector simultaneously for both rear projection and front projection.

In the above explanation, the light control film and the polarization separation element are both laminated with a transparent adhesive or the like. It may be arranged.

The projection system of the present disclosure can achieve rear projection or front projection in the first embodiment by simply switching the polarization direction of the polarization switching plate of the projection unit or controlling the voltage of one or two light control films. In addition, the second embodiment can be used for various purposes as described below as rear projection, front projection, or dual-use simultaneous projection.

The screen used in the projection system of the second embodiment of the present disclosure is arranged on the window of the conference room, and is used in the form of front projection in FIG. By using it, it will be an open meeting.

A screen used in the projection system of the present disclosure is arranged in the window for the store, and outside the business hours, advertisements are projected outside the store as rear projection in FIG. 2 of the first embodiment or FIG. 4 of the second embodiment. I do. During business hours, the front projection shown in FIG. 3 of the first embodiment or FIG. 5 of the second embodiment is used as a presentation tool for customers in the store.

A screen used in the projection system of the present disclosure is arranged on a partition that separates the room, and as a rear projection in FIG. 2 of the first embodiment or FIG. 4 of the second embodiment, the interior of the partition and the outside of the partition Public announcement projection.

A screen used in the projection system of the present disclosure is arranged on the window that separates the inside and outside of the vehicle, and as the rear projection of FIG. 2 of the first embodiment or FIG. In addition, in the event of an emergency such as illness, projection is performed outside the vehicle to call attention. Also, as the front projection of FIG. 3 of the first embodiment or FIG. 5 of the second embodiment, a virtual reality space is created in the vehicle to enhance the convenience of the driver and the enjoyment of the fellow passengers.

100 Projection system of the first embodiment 100-(R) Rear projection by the system of the first embodiment 100-(F) Front projection 200- by the system of the first embodiment (R) Rear projection 200-(F) by the system of the second embodiment Front projection 200-(RF) by the system of the second embodiment System-based rear/front dual-use projection 10: light control film or first light control film 10a: light control film (when transparent)
10b... Light control film (when translucent)
10c... Light control film (when light is shielded)
11a First transparent film substrate 11b Second transparent film substrate 12a, 12b Transparent electrode 13 Light control layer (PNLC type)
14 Polymer network 15 Liquid crystal molecules 16, 16a, 16b AC power supply 17, 17a, 17b Switch 20 Second light control film 30 . . . Polarization separation element 40 .. Screen 50 according to the projection system of the first embodiment .. Screen 60 according to the projection system of the second embodiment .. Projection unit 61. Projector 62 Polarization switching plate (polarizer capable of switching linear polarization)
62-(TM): Switching plate for TM polarization 62-(TE): Switching plates for TE polarization 63, 73: Diffuse transmitted light 64, 74: Diffusion Reflected light 80 Incident light 81 Transmitted light 82 Reflected scattered light 83 Transmitted scattered light 90 Wire grid polarizer 91 ..transparent substrate 92........grid pattern 93 of metal film ..incident light 94..TM polarized light 95..TE polarized light P..viewer

Claims (5)

A projection system consisting of a projection unit and a screen,
the screen includes a polarization separation element, and a light control film on one side of the polarization separation element;
the projection unit comprises a polarizer on the screen side of the projector;
The polarizer has a function of switching between a transmission axis that matches the TM polarization axis determined by the polarization separation element and a transmission axis that matches the TE polarization axis determined by the polarization separation element,
The light control film has a light control layer that reversibly changes between a cloudy state and a transparent state, and can switch the haze (degree of cloudiness) in the cloudy state between two or more stages by applying a voltage.
A projection system characterized by: A projection system consisting of a projection unit and a screen,
the screen includes a polarization separation element, and light control films are provided on both sides of the polarization separation element;
the projection unit comprises a polarizer on the screen side of the projector;
The polarizer has a function of switching between a transmission axis that matches the TM polarization axis determined by the polarization separation element and a transmission axis that matches the TE polarization axis determined by the polarization separation element,
The light control film has a light control layer that reversibly changes between a cloudy state and a transparent state, and can switch the haze (degree of cloudiness) in the cloudy state between two or more stages by applying a voltage.
A projection system characterized by: The screen is arranged on a window that separates the indoors from the outdoors or the indoors from the outdoors,
3. A method of using the projection system according to claim 1 or 2, characterized by: The screen is arranged on a partition that divides the room,
3. A method of using the projection system according to claim 1 or 2, characterized by: The screen is arranged on the window that separates the inside and outside of the vehicle,
3. A method of using the projection system according to claim 1 or 2, characterized by:

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