FR3077144A1 - DISPLAY DEVICE AND METHOD - Google Patents

Abstract

The present invention relates to a display device (101) comprising a screen (1) and a projector (2) arranged to project an image (3) onto the screen, said device being characterized in that the screen comprises a alternating: - diffusion zones (4) arranged to diffuse light (6) of the projected image and - transparent areas (5) arranged to transmit through the screen of the light of the projected image.

Description

"Display device and method"

Technical area

The present invention relates to a display screen, a display device comprising a screen according to the invention and a method implemented by a device according to the invention.

Such a device allows a user to project an image on a transparent support.

State of the art

Transparent screen technologies are known which make it possible to combine the real (object behind the screen) and the virtual (image displayed on the screen).

Among them, we know for example:

- technologies of transparent LCD screen or transparent sheet composed of multiple holographic optical elements, having the problem of being often complex and expensive,

- technologies of projection on film, having the problem of having a quality of visualization of the projected image which decreases when the angle of visualization of this film by a user closes (and often also a transparency generally rather weak or blurred ).

The object of the present invention is to solve at least one of the above-mentioned problems.

Statement of the invention

This objective is achieved with a display screen comprising an alternation:

- diffusion zones (preferably separate or not contiguous) arranged to diffuse light (typically of an image projected on this screen) and

- transparent zones (preferably contiguous) arranged to transmit light across the screen (typically of the same image projected on this screen).

The diffusion zones can be arranged to diffuse light from a projected image:

- on the side of the face of the screen receiving the projected image, and

- across the screen from the side of the face opposite to the face of the screen receiving the projected image.

Each diffusion zone can be arranged to diffuse at least 70%, preferably at least 80% or even at least 90% of the light intensity received from at least one wavelength between 400 nm and 700 nm, from preferably each wavelength between 400 nm and 700 nm.

Each transparent zone can be arranged to transmit through the screen at least 70%, preferably at least 80% or even at least 90% of the light intensity received from at least one wavelength between 400 nm and 700 nm, preferably of each wavelength between 400 nm and 700 nm.

The transparent zones can be linked together so as to form a single transparent zone so that the diffusion zones are distributed in the transparent zone and separated from each other by the transparent zone.

Each diffusion zone can have a length greater than or equal to 100 μm and / or less than or equal to 3000 μm.

Each diffusion zone can have an area greater than or equal to 0.01x10 ^e pm ² and / or less than or equal to 30x10 ^e pm ² .

Each diffusion zone can have a width to length ratio greater than or equal to 0.1 and / or less than or equal to 1.

The screen can have a ratio of the area of the diffusion areas to the area of the transparent areas greater than or equal to 5% and / or less than or equal to 60%.

The broadcast areas can be evenly distributed on the screen.

Each diffusion zone may comprise printing and / or engraving and / or polishing on a transparent support, each transparent zone comprising an absence of printing and / or engraving and / or polishing on this same transparent support, the screen comprising said support. and the prints and / or engravings and / or polishes of the diffusion zones. The support may include a transparent film on which the prints and / or engravings and / or polishes are made. The support may further comprise a transparent surface on which the film is spread.

Each diffusion zone can be white.

According to yet another aspect of the invention, a display device is proposed, comprising a screen and a projector arranged to project an image on the screen, said device being characterized in that the screen comprises an alternation:

- diffusion zones (preferably separate or not contiguous) arranged to diffuse light from the projected image and

- transparent zones (preferably contiguous) arranged to transmit light across the screen of the projected image.

The diffusion zones can be arranged to diffuse light from the projected image:

- on the side of the face of the screen receiving the projected image, and

- across the screen from the side of the face opposite to the face of the screen receiving the projected image.

Each diffusion zone can be arranged to diffuse at least 70%, preferably at least 80% or even at least 90% of the light intensity received from at least one wavelength between 400 nm and 700 nm, from preferably each wavelength between 400 nm and 700 nm.

Each transparent zone can be arranged to transmit through the screen at least 70%, preferably at least 80% or even at least 90% of the light intensity received from at least one wavelength between 400 nm and 700 nm, preferably of each wavelength between 400 nm and 700 nm.

The transparent zones can be linked together so as to form a single transparent zone so that the diffusion zones are distributed in the transparent zone and separated from each other by the transparent zone.

Each diffusion zone can have a length greater than or equal to 100 μm and / or less than or equal to 3000 μm.

Each diffusion zone can have an area greater than or equal to 0.01x10 ^e pm ² and / or less than or equal to 30x10 ^e pm ² .

Each diffusion zone can have a width to length ratio greater than or equal to 0.1 and / or less than or equal to 1.

The screen can have a ratio of the area of the diffusion areas to the area of the transparent areas greater than or equal to 5% and / or less than or equal to 60%.

The broadcast areas can be evenly distributed on the screen.

Each diffusion zone may comprise printing and / or engraving and / or polishing on a transparent support, each transparent zone comprising an absence of printing and / or engraving and / or polishing on this same transparent support, the screen comprising said support. and the prints and / or engravings and / or polishes of the diffusion zones. The support may include a transparent film on which the prints and / or engravings and / or polishes are made. The support may further comprise a transparent surface on which the film is spread.

Each diffusion zone can be white.

The device according to the invention can comprise means for holding the screen in at least two positions:

a compact position, preferably folded and / or rolled up, for which the screen is inaccessible for the image projected by the projector, and

- a deployed position, preferably unfolded and / or unrolled, for which the screen is accessible for the image projected by the projector.

The device according to the invention may comprise a reel for keeping the screen rolled up in its rolled up position.

An output of the projector can be located at a distance from the screen less than 50 cm.

The projector can be secured to the screen.

The projector can be arranged to project the image on the screen in a direction not orthogonal to the screen so that the projector can be located between a user and the screen without the projector obstructing vision, by l user, of the image projected on the screen.

According to yet another aspect of the invention, a display method is proposed comprising a projection, by a projector, of an image on a screen, said method being characterized in that the screen comprises an alternation:

- diffusion zones (preferably separate or not contiguous) diffusing light from the projected image and

- transparent areas (preferably contiguous) transmitting across the screen light from the projected image.

Diffusion areas can diffuse light from the projected image:

- on the side of the face of the screen receiving the projected image, and

- across the screen from the side of the face opposite to the face of the screen receiving the projected image.

Each diffusion zone can diffuse at least 70%, preferably at least 80% or even at least 90% of the light intensity received from at least one wavelength between 400 nm and 700 nm, preferably from each wavelength between 400 nm and 700 nm.

Each transparent zone can transmit through the screen at least 70%, preferably at least 80% or even at least 90% of the light intensity received from at least one wavelength between 400 nm and 700 nm, preferably of each wavelength between 400 nm and 700 nm.

- 6The transparent areas can be linked together so as to form a single transparent area so that the diffusion areas are distributed in the transparent area and separated from each other by the transparent area.

Each diffusion zone preferably has a length greater than or equal to 100 μm and / or less than or equal to 3000 μm.

Each diffusion zone preferably has an area greater than or equal to 0.01x10 ^e pm ² and / or less than or equal to 30x10 ^e pm ² .

Each diffusion zone preferably has a width to length ratio greater than or equal to 0.1 and / or less than or equal to 1.

The screen preferably has a ratio of the area of the diffusion areas to the area of the transparent areas greater than or equal to 5% and / or less than or equal to 60%.

The broadcast areas are preferably distributed homogeneously on the screen.

Each diffusion zone can comprise printing and / or engraving and / or polishing on a transparent support, each transparent zone preferably comprising an absence of printing and / or engraving and / or polishing on this same transparent support, the screen comprising said support and the prints and / or engravings and / or polishes of the diffusion zones. The support may include a transparent film on which the prints and / or engravings and / or polishes are made. The support may further comprise a transparent surface on which the film is spread.

Each diffusion zone is preferably white in color.

The method according to the invention can include passing the screen between at least two positions:

a compact position, preferably folded and / or rolled up, for which the screen is inaccessible for the image projected by the projector, and

- A deployed position, preferably unfolded and / or unrolled, for which the screen is accessible for the image projected by the projector, the screen being held in each of these two positions by holding means.

The method according to the invention may comprise holding, by a reel, the screen in its rolled up position.

An output of the projector can be located at a distance from the screen less than 50 cm.

The projector can be secured to the screen.

The projector can project the image on the screen in a direction not orthogonal to the screen so that the projector is located between a user and the screen without the projector obstructing the user's view of the image projected on the screen.

Description of the figures and embodiments

Other advantages and particularities of the invention will appear on reading the detailed description of implementations and embodiments in no way limiting, and the following appended drawings:

FIG. 1 is a schematic profile view of a first embodiment of device 101 according to the invention (which is the preferred embodiment of the invention),

FIG. 2 is a front view of part of a screen 1 of the device 101,

FIG. 3 is a profile section view of part of a screen 1 of the device 101,

FIGS. 4 and 5 are front views of different forms of diffusion zones 4 of the device 101,

FIG. 6 is a perspective view of a second embodiment of the device 102 according to the invention, for a so-called “compact” position of the screen 1,

FIG. 7 is a perspective view of the device 102, for a so-called “deployed” position of the screen 1, and

FIG. 8 is a side sectional view of the device 102 facing a user 15, for the deployed position of the screen 1.

As these embodiments are in no way limitative, it is possible in particular to consider variants of the invention comprising only a selection of characteristics described or illustrated subsequently isolated from the

- 8 other characteristics described or illustrated (even if this selection is isolated within a sentence comprising these other characteristics), if this selection of characteristics is sufficient to confer a technical advantage or to differentiate the invention from the state of the prior art. This selection comprises at least one characteristic, preferably functional, without structural details, and / or with only part of the structural details if this part only is sufficient to confer a technical advantage or to differentiate the invention from the state of the art. earlier.

We will first describe, with reference to Figures 1 to 5, an embodiment of screen 1 according to the invention and a first embodiment of display device 101 according to the invention comprising this screen 1 and putting implementing a first embodiment of the method according to the invention.

The device 101 described below makes it possible to video-project digital content on a transparent or semi-transparent screen 1.

The display device 101 comprises the screen 1.

The screen 1 is provided with two opposite faces 11, 12.

The display device 101 comprises a projector 2 arranged to project an image 3 on the screen 1, so that this image 3 is visible on the screen 1 by a user 15 located on the side of one or the other of the faces 11, 12 of the screen 1.

The device 101 is broken down into two separate blocks, the screen 1 and the video projection system 2 which are not integral.

The projector 2 is in this embodiment a video projector, that is to say a projector arranged to project successively over time several images at a frequency of at least 25Hz and preferably different from each other.

The screen 1 comprises, along lines (typically several straight lines) on the face 11 and / or 12, alternations:

- diffusion zones 4 arranged to diffuse light 6 of the projected image 3 and

- transparent zones 5 arranged to transmit light from the projected image 3 through the screen 1.

For example with reference to FIG. 2, following a line 16 along the face 11 or 12 of the screen 1, there is a succession of alternating diffusion zones 4 and transparent zones 5.

The diffusion zones 4 are separate, that is to say not contiguous with each other.

The transparent zones 5 are contiguous.

The transparent zones 5 are linked together so as to form a single transparent zone 5 so that the diffusion zones 4 are distributed in the transparent zone 5 and separated from each other by the transparent zone 5.

Each diffusion zone 4 is arranged to diffuse light 6 from the projected image 3; this light diffusion propagates:

- on the side of the face 11 receiving the projected image 3, and

- through the screen 1 on the side of the face opposite 12 to the face 11 receiving the projected image 3.

Each diffusion zone 4 is arranged to diffuse at least 70%, more exactly at least 80% and even more exactly at least 90% of the light intensity received from at least one wavelength between 400 nm and 700 nm , preferably of each wavelength between 400 nm and 700 nm.

More precisely, each broadcasting zone 4 is arranged to broadcast:

- on the side of the face 11 receiving the projected image 3: at least 35%, preferably at least 40% and even more exactly at least 45% of the light intensity received from at least one wavelength between 400 nm and 700 nm, preferably of each wavelength between 400 nm and 700 nm,

- through the screen 1 on the side of the face opposite 12 to the face 11 receiving the projected image 3: at least 35%, preferably at least 40% and even more exactly at least 45% of the light intensity received at least one wavelength between 400 nm and 700 nm, preferably each wavelength between 400 nm and 700 nm

Each transparent zone 5 is arranged to transmit (without diffusion) through the screen 1 at least 70%, more exactly at least 80% and even more exactly at least 90% of the light intensity received from at least one length d wave between 400 nm and 700 nm, preferably of each wavelength between 400 nm and 700 nm.

Thus, in the first embodiment of the method according to the invention, there is a projection, by the projector 2, of the image 3 on the screen 1, the screen 1 comprising an alternation:

- diffusion zones 4 diffusing light 6 of the projected image 3 and

- transparent zones 5 transmitting through the screen 1 light 6 of the projected image 3.

In this first embodiment of the method according to the invention, the diffusion zones 4 diffuse light from the projected image 3:

- on the side of the face 11 of the screen 1 receiving the projected image 3, and

- through screen 1 on the side of face 12 opposite to face 11 of screen 1 receiving the projected image 3.

In this first embodiment of the method according to the invention, each diffusion zone 4 diffuses at least 70%, more exactly at least 80% and even more exactly at least 90% of the light intensity received from at least one length. wavelength between 400 nm and 700 nm, more precisely of each wavelength between 400 nm and 700 nm.

In this first embodiment of the method according to the invention, each transparent zone transmits through the screen 1 at least 70%, more exactly at least 80% and even more exactly at least 90% of the light intensity received from at least one wavelength between 400 nm and 700 nm, more precisely each wavelength between 400 nm and 700 nm.

Thus, the screen 1 is arranged so that a user 15 can see at the same time and in a superimposed manner:

- on screen 1: the projected image 3, and

- through the screen 1: an object 17 located behind the screen 1 relative to the user 15.

The invention makes it possible to solve the problem posed by the solutions of the state of the art based on a uniformly frosted film, that is to say the problem of a quality of visualization of the projected image which decreases when the viewing angle of this film according to the state of the art deviates from a line orthogonal to this film or screen according to the state of the art.

Each diffusion zone 4 comprises a surface element 7 (typically consisting of printing and / or engraving and / or polishing) on a transparent support 8, 9, each transparent zone 5 comprising an absence of printing and / or engraving and / or polishing on the same transparent support 8, 9, the screen 1 comprising said support 8, 9 and the surface elements 7 (prints and / or engravings and / or polishing of the diffusion zones).

Thus a specific treatment is applied on screen 1.

These surface elements 7 constitute a network of surface elements on the screen 1, of size, shape, area and specific arrangement.

The surface elements 7 are repeated in a pattern and then forms a network of surface elements 7 on the screen 1 corresponding to a network of diffusion zones 4 on the screen 1.

In the case illustrated in FIG. 3, each diffusion zone 4 comprises an ink impression 7.

Each diffusion zone 4 is white in color.

The ink 7 prints are obtained with a Canon Arizona printer with white UV-curing ink, for example reference IJC256 for Canon Arizona printer.

Each ink impression 7 typically has a thickness greater than or equal to 10 μm and / or less than or equal to 1000 μm, typically equal to a hundred micrometers.

Each surface element 7 is preferably protected by laminating a transparent thin layer (forming part of the screen 1) on the film 8.

Each surface element 7 or diffusion zone 4 which is described here has an identifiable contour. In order to characterize them, a maximum limit length DL is defined respectively of a surface element 7 or of a diffusion zone 4 considered to be the greatest possible distance between two points located at two different places on the contour.

- 12respectively of this surface element 7 or diffusion zone 4. This distance will also be called hereinafter limit distance and denoted DL.

Each diffusion zone 4 or surface element 7 has a length (DL):

- greater than or equal to 100 pm, preferably greater than or equal to 150 pm, and / or

- Less than or equal to 3000 pm, preferably less than or equal to 1000 pm, preferably less than or equal to 500 pm, for example equal to 200 pm.

The length DL respectively of a zone considered 4 or surface element 7 considered is equal to the length DU respectively of each of the other zones 4 or of each of the other elements 7 to ± 5%:

| DL-DLi | / DL <5% but larger deviations may exist in variants of the invention.

FIG. 4 illustrates the length DL in the case of a zone 4 or a surface element 7 of circular shape. However, this shape can in variants be triangular, diamond, square, rectangular, oval, elliptical, or any.

The shape of zones 4 or elements 7 is preferably the same for all zones 4 or elements 7.

Each diffusion zone 4 or surface element 7 has an area A (measured on the face 11 and / or 12):

- greater than or equal to 0.01x10 ^e pm ² , preferably greater than or equal to 0.1x10 ^e pm ² and / or

- less than or equal to 30x10 ^th pm ² , preferably less than or equal to 3x10 ^th pm ² , preferably less than or equal to 1x10 ^th pm ² for example equal to 0.125x10 ^th pm ² .

The area A respectively of a zone 4 or surface element 7 considered is equal to the area Ai respectively of each of the other zones 4 or of each of the other elements 7 to ± 5%:

| A-Ai | / A <5% but larger deviations may exist in variants of the invention.

- 13 As illustrated in FIG. 5, we define a width DLorth respectively of a surface element 7 or of a diffusion zone 4 considered as the distance between two points:

- located at two different places on the outline respectively of this surface element 7 or of this diffusion zone 4 and

- connected by a straight line perpendicular to the straight line along which the length DL respectively of this surface element 7 or of this diffusion zone 4 is measured.

FIG. 5 illustrates the case of a zone 4 or of a surface element 7 having a diamond shape.

Each diffusion zone 4 or surface element 7 has a ratio R = DLorth / DL of its width (DLorth) over its length (DL):

- greater than or equal to 0.1, preferably greater than or equal to 0.4, preferably greater than or equal to 0.7, and / or

- less than or equal to 1, for example equal to 1.

This ratio R. respectively of a zone considered 4 or surface element 7 considered is equal to this same ratio Ri respectively of each of the other zones 4 or of each of the other elements 7 to ± 5%:

| R-Ri | / R <5% but larger deviations may exist in variants of the invention.

Screen 1 has a ratio (also called "density of diffusion zones") of the total area (measured on side 11 and / or 12) of diffusion zones 4 (i.e. the sum of all A and Ai) over the total area of transparent areas 5:

- greater than or equal to 5% and / or

- Less than or equal to 60%, preferably less than or equal to 40%, preferably less than or equal to 20%, for example equal to 12%.

The diffusion zones 4 are distributed and distributed homogeneously on the screen 1. However, in variants, the density of diffusion zones can vary locally, while remaining in the range of 5% to 60% previously defined.

The support comprises a transparent flexible film 8 on which the ink prints 7 are made.

Film 8 is a 120 µm thick polyester-based micro-suction film, free of polyvinyl chloride (PVC), and cut by a ZUND G3 XL3200 machine.

The support also comprises a transparent surface 9 (typically made of glass or polymer) on which the film is spread.

The surface 9 is rigid.

This transparent surface 9 is typically a glazed surface (such as a window or a shop window), for example a shop window.

The film 8 and the projector 2 are located on the same side of the surface 9.

The working distance of the projector 2, which is the length of the shortest segment connecting the screen 1 to the output 10 of the projector 2 by which the projected image 3 leaves the projector 2, can be significant, for example up to 10 meters. In this embodiment, it is possible, for example, to use a Panasonic PT-RZ970 reference video projector 2.

We will now describe, with reference to Figures 6 to 8, another embodiment of screen 1 according to the invention and a second embodiment of display device 102 according to the invention comprising this screen 1 and implementing a second embodiment of the method according to the invention. These screen 1, device 102 and method embodiments will only be described for their differences with respect to the embodiments of FIGS. 1 to 5.

In these embodiments of FIGS. 6 to 8, the support does not include the surface 9 but only includes the film 8.

In a “deployed” position of the screen 1, the support consists of the film 8 which is for example suspended or stretched.

More precisely, the device 102 comprises means 13, 14 for holding the screen 1 according to at least two positions of the screen 1:

a compact position (illustrated in FIG. 6), preferably folded and / or rolled up, for which the screen 1 is inaccessible for the image projected 3 by the projector 2, and

A deployed position (illustrated in FIGS. 7 and 8), preferably unfolded and / or unwound, for which the screen 1 is accessible for the projected image 3 by the projector 2.

Among these means for holding the screen 1, the device 102 comprises a reel 14 arranged to keep the screen rolled up 1 in its compact (or rolled up) position.

Among these means for holding the screen 1, the device 102 comprises one or more unfoldable rods 13 (for example by pivot and / or ball joint connections) arranged to keep the screen 1 stretched between the reel 14 and one end of each rod 13 in the deployed (or unwound) position.

An output 10 (through which the projected image 3 leaves the projector 2) of the projector 2 is located at a distance from the screen less than 50 cm. This distance is called the working distance, and is the length of the shortest segment connecting the screen 1 to this output 10.

The projector 2 is of the picoprojector and / or short focal length type, for example of reference Philips PPX 34 117 W or LG PH150G or LG PF1000U etc.

The projector 2 is integral with the screen 1.

More precisely, the projector 2 is integral with the reel 14.

In this embodiment of device 102, the screen 1 and the projector 2 are not fixed to the ground or to any element fixed to the ground.

In this embodiment of device 102, the screen 1 and the projector 2 necessarily move together.

The device 102 forms a kakemono.

The projector 2 is arranged to project the image 3 on the screen 1 in a direction not orthogonal to the screen 1 so that the projector 2 can be located between a user 15 and the screen 1 without the projector 2 n obstruct the vision, by the user 15, of the projected image 3 on the screen 1.

Thus the second embodiment of the method according to the invention comprises a maintenance, by the reel 14, of the screen 1 in its rolled up position.

This second embodiment of the method according to the invention then comprises a passage of the screen 1 between at least two positions:

a compact position, preferably corresponding to its folded and / or rolled up position, for which the screen 1 is inaccessible for the image projected 3 by the projector 2, and

a deployed position, preferably unfolded and / or unwound, for which the screen 1 is accessible for the projected image 3 by the projector 2 the screen being held in each of these two positions by holding means 14 and 13.

Then, the projector 2 projects the image 3 on the screen 1 (in its deployed position) in a direction not orthogonal to the screen 1 so that the projector 2 is located between a user 15 and the screen 1 without the projector 2 does not obstruct the vision, by the user 15, of the projected image 3 on the screen 1.

Of course, the invention is not limited to the examples which have just been described and numerous modifications can be made to these examples without departing from the scope of the invention.

Of course, the different characteristics, forms, variants and embodiments of the invention can be combined with one another in various combinations.

Claims (15)

1. Display device (101, 102), comprising a screen (1) and a projector (2) arranged to project an image (3) on the screen, said device being characterized in that the screen comprises an alternation : - diffusion zones (4) arranged to diffuse light (6) of the projected image and - transparent zones (5) arranged to transmit light across the screen of the projected image. 2. Device according to claim 1, characterized in that the diffusion zones are arranged to diffuse light from the projected image: - on the side of the face (11) of the screen receiving the projected image, and - through the screen on the side of the face opposite (12) to the face of the screen receiving the projected image. 3. Device according to claim 1 or 2, characterized in that each diffusion zone is arranged to diffuse at least 80% of the light intensity received from at least one wavelength between 400 nm and 700 nm, preferably each wavelength between 400 nm and 700 nm. 4. Device according to any one of the preceding claims, characterized in that each transparent zone is arranged to transmit through the screen at least 80% of the light intensity received from at least one wavelength between 400 nm and 700 nm, preferably of each wavelength between 400 nm and 700 nm. 5. Device according to any one of the preceding claims, characterized in that the transparent zones are interconnected so as to form a single transparent zone so that the diffusion zones are distributed in the transparent zone and separated between them through the transparent area. 6. Device according to any one of the preceding claims, characterized in that each diffusion zone has: - has a length (DL) greater than or equal to 100 pm and / or less than or equal to 3000 pm, and / or - a width (DLorth) to length (DL) ratio greater than or equal to 0.1 and / or less than or equal to 1. 7. Device according to any one of the preceding claims, characterized in that each diffusion zone has an area greater than or equal to 0.01x10 ^e pm ² and / or less than or equal to 30x10 ^e pm ² . 8. Device according to any one of the preceding claims, characterized in that the screen has a ratio of the area of the diffusion areas to the area of the transparent areas greater than or equal to 5% and / or less than or equal to 60%. 9. Device according to any one of the preceding claims, characterized in that each diffusion zone comprises printing and / or engraving and / or polishing (7) on a transparent support, each transparent zone comprising an absence of printing and / or etching and / or polishing on the same transparent support, the screen comprising said support and the printing and / or etching and / or polishing of the diffusion zones. 10. Device according to claim 9, characterized in that the support comprises a transparent film (8) on which is made the prints and / or etchings and / or polishes (7), the support further comprising a transparent surface (9) on which the film is spread. 11. Device according to any one of the preceding claims, characterized in that it comprises means (13, 14) for holding the screen in at least two positions: a compact position, preferably folded and / or rolled up, for which the screen is inaccessible for the image projected by the projector, and - a deployed position, preferably unfolded and / or unrolled, for which the screen is accessible for the image projected by the projector. 12. Device according to any one of the preceding claims, characterized in that an outlet (10) of the projector is located at a distance from the screen of less than 50 cm. 13. Device according to any one of the preceding claims, characterized in that the projector is secured to the screen. 14. Device according to any one of the preceding claims, characterized in that the projector is arranged to project the image on the screen in a direction not orthogonal to the screen so that the projector can be located between a user and the screen without the projector obstructing the user's vision of the image projected on the screen. 15. A method (101, 102) of display comprising a projection, by a projector (2), of an image (3) on a screen (1), said method being characterized in that the screen comprises an alternation: - diffusion zones (4) diffusing light (6) of the projected image and - transparent zones (5) transmitting across the screen light of the projected image.