WO2019141554A1

WO2019141554A1 - Display device and method

Info

Publication number: WO2019141554A1
Application number: PCT/EP2019/050386
Authority: WO
Inventors: Juliette PEYRONNET DREMIERE; Guillaume RAFFAULT; Apolline VITSE; Cyril PANNETIER
Original assignee: Institut D'optique
Priority date: 2018-01-19
Filing date: 2019-01-09
Publication date: 2019-07-25
Also published as: FR3077144A1; FR3077144B1

Abstract

The 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 alternating: - diffusion zones (4) arranged to diffuse light (6) of the projected image, and - transparent zones (5) arranged to transmit light from the projected image through the screen.

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 medium.

State of the art

Transparent screen technologies are known that combine the real (object behind the screen) and the virtual (image displayed on the screen).

Among them, we know for example:

transparent LCD screen or transparent sheet technologies composed of multiple holographic optical elements, the problem of which is often complex and expensive,

film projection technologies, having the problem of having a viewing quality of the projected image which decreases when the viewing angle of this film by a user closes (and often also a transparency that is generally quite weak or fuzzy) ).

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

Presentation of the invention

This objective is achieved with a display screen comprising alternation:

broadcasting zones (preferably separate or non-contiguous) arranged to diffuse light (typically an image projected on this screen) and - Transparent areas (preferably contiguous) arranged to transmit through the screen of the light (typically 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 screen face receiving the projected image, and

- through the screen on the side of the face opposite to the face of the screen receiving the projected image.

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

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

The transparent areas may be interconnected 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 may have a length greater than or equal to 100 μm and / or less than or equal to 3000 μm.

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

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

The diffusion zones can be evenly distributed on the screen. Each diffusion zone may comprise printing and / or etching and / or polishing on a transparent support, each transparent zone comprising a lack of printing and / or etching and / or polishing on the same transparent support, the screen comprising said support and printing and / or etching and / or polishing diffusion areas. The support may comprise a transparent film on which prints and / or etchings and / or polishes are made. The support may further comprise a transparent surface on which the film is spread.

Each diffusion zone may be white in color.

According to yet another aspect of the invention, there is provided a display device, 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 non-contiguous) arranged to diffuse light from the projected image and

- Transparent areas (preferably contiguous) arranged to transmit through the screen of the light of the projected image.

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

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

Each broadcast area can be arranged to broadcast at least

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

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

The diffusion zones can be evenly distributed on the screen.

Each diffusion zone may comprise printing and / or etching and / or polishing on a transparent support, each transparent zone comprising a lack of printing and / or etching and / or polishing on the same transparent support, the screen comprising said support and printing and / or etching and / or polishing diffusion areas. The support may comprise a transparent film on which prints and / or etchings and / or polishes are made. The support may further comprise a transparent surface on which the film is spread.

Each diffusion zone may be white in color.

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

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

an extended 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 winder for keeping the screen wound in its wound position. An output of the projector may be located at a distance from the screen of less than 50 cm.

The projector can be attached to the screen.

The projector can be arranged to project the image on the screen in a non-orthogonal direction on the screen so that the projector can be located between a user and the screen without the projector obstructing the vision, by the projector. user, the image projected on the screen.

According to yet another aspect of the invention, there is provided a display method 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 non-contiguous) diffusing light from the projected image and

- Transparent areas (preferably contiguous) transmitting through the screen of the light of the projected image.

Diffusion zones can diffuse light from the projected image:

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

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

Each transparent zone may transmit through the screen at least 70%, preferably at least 80% or even at least 90% of the received light intensity of at least one wavelength between 400 nm and 700 nm, preferably each wavelength between 400 nm and 700 nm. The transparent areas may be interconnected 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 preferably has a length greater than or equal to 100 μm and / or less than or equal to 3000 μm.

Each diffusion zone is preferably greater than or equal to area 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 zones over the area of the transparent zones greater than or equal to 5% and / or less than or equal to 60%.

The diffusion zones are preferably distributed homogeneously on the screen.

Each diffusion zone may comprise printing and / or etching and / or polishing on a transparent support, each transparent zone preferably comprising a lack 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. The support may comprise a transparent film on which prints and / or etchings 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 may comprise a passage of the screen between at least two positions:

an extended position, preferably unfolded and / or unwound, for which the screen is accessible for the image projected by the projector, the screen being maintained in each of these two positions by holding means. The method according to the invention may comprise holding, by a winder, the screen in its wound position.

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

The projector can be attached to the screen.

The projector can project the image on the screen in a non-orthogonal direction on the screen so that the projector is located between a user and the screen without the projector obstructing the user's vision 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 non-limiting embodiments, and the following appended drawings:

FIG. 1 is a schematic side view of a first device embodiment 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 sectional 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 device 102 according to the invention, for a position known as

"Compact" 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 profile sectional view of the device 102 facing a user 15, for the deployed position of the screen 1.

These embodiments being in no way limiting, it will be possible to consider variants of the invention comprising only a selection of characteristics described or illustrated subsequently isolated from the other characteristics described or illustrated (even if this selection is isolated within a sentence including 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 invention. prior art. This selection comprises at least one preferably functional characteristic without structural details, and / or with only a part of the structural details if this part alone is sufficient to confer a technical advantage or to differentiate the invention from the state of the art. earlier.

Firstly, with reference to FIGS. 1 to 5, a screen embodiment 1 according to the invention and a first embodiment of a display device 101 according to the invention comprising this screen 1 and setting implement a first embodiment of the method according to the invention.

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

The display device 101 includes 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. other faces 11, 12 of the screen 1.

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

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

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

broadcasting zones 4 arranged to diffuse light 6 of the projected image 3 and transparent areas 5 arranged to transmit through the screen 1 of the light of the projected image 3.

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

The diffusion zones 4 are separated, that is to say, not joined to each other.

The transparent areas 5 are joined.

The transparent zones 5 are interconnected 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 of the projected image 3; this scattering of light is spreading:

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

through the screen 1 on the side of the opposite face 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 received light intensity of at least one wavelength between 400 nm and 700 nm. preferably each wavelength between 400 nm and 700 nm.

More exactly, each diffusion 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 received light intensity of at least one wavelength between 400 nm and 700 nm, preferably each wavelength between 400 nm and 700 nm,

- Through the screen 1 on the side of the opposite face 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 received light intensity of at least a length of 1%. wavelength between 400 nm and 700 nm, preferably 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 of the 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 the screen 1 on the side of the face 12 opposite to the face 11 of the 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 by at least one length. wavelength between 400 nm and 700 nm, more exactly 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 the screen. at least one wavelength between 400 nm and 700 nm, more exactly each wavelength between 400 nm and 700 nm.

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

on screen 1: the projected image 3, and

through the screen 1: an object 17 located behind the screen 1 with respect to the user 15. The invention solves the problem posed by state-of-the-art solutions based on a uniformly etched film, i.e., the problem of a viewing quality of the projected image that decreases when the viewing angle of this film according to the state of the art deviates from a line orthogonal to the 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 etching and / or polishing) on a transparent support 8, 9, each transparent zone 5 comprising a lack of printing and / or etching and / or polishing on the same transparent support 8, 9, the screen 1 comprising said support 8, 9 and the surface elements 7 (printing and / or etching and / or polishing of the diffusion zones).

Thus a specific treatment is applied on the screen 1.

These surface element 7 constitute an array of surface elements on the screen 1, of size, shape, area and specific arrangement.

The surface elements 7 repeat in a pattern and then form an array 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 printing 7.

Each diffusion zone 4 is white in color.

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

Each ink printing 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 microns.

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

Each surface element 7 or diffusion zone 4 that is described here has an identifiable contour. In order to characterize them, a maximum limit length DL of a surface element 7 or a diffusion zone 4 considered as the greatest possible distance between two points located at two different locations of the contour is defined. respectively of this surface element 7 or diffusion zone 4. This distance will also be called later limit distance and denoted DL.

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

- greater than or equal to 100 μm, preferably greater than or equal to

150 pm, and / or

less than or equal to 3000 μm, preferably less than or equal to 1000 μm, preferably less than or equal to 500 μm

for example equal to 200 μm.

The length DL respectively of a considered zone 4 or surface element 7 considered is equal to the length DLi 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.

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

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

Each diffusion zone 4 or surface element 7 has an area A (measured on 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 ^e pm ² , preferably less than or equal to 3x10 ^e pm ² , preferably less than or equal to 1x10 ^e pm ²

for example equal to 0.125x10 ^e pm ² .

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

| A-Ai | / A <5%

but larger deviations may exist in variants of the invention. As illustrated in FIG. 5, a width DLorth respectively of a surface element 7 or of a diffusion zone 4 considered (e) is defined as the distance between two points:

located at two different locations of the contour respectively of this surface element 7 or of this diffusion zone 4 and

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

Figure 5 illustrates the case of a zone 4 or 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) along 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 considered zone 4 or surface element 7 considered is equal to this same ratio Ri respectively of each of the other zones 4 or 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 "diffusion area density") of the total area (measured on face 11 and / or 12) of diffusion areas 4 (i.e., the sum of all A and Ai) over the total area of the 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 evenly distributed and distributed on the screen 1. However, in variants, the density of diffusion zones may vary locally, while remaining within the range of 5% to 60% previously defined. The support comprises a transparent flexible film 8 on which ink impressions 7 are produced.

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

The support further comprises a transparent surface 9 (typically 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 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 through which the projected image 3 leaves the projector 2, can be important, for example up to 10 meters. In this embodiment, it is possible, for example, to use a Panasonic PT-RZ970 reference projector 2.

Reference will now be made to FIGS. 6 to 8 of another screen embodiment 1 according to the invention and a second embodiment of a 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 from the embodiments of FIGS. 1 to 5.

In these embodiments of FIGS. 6 to 8, the support does not include the surface 9 but includes only 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 exactly, the device 102 comprises means 13, 14 for maintaining the screen 1 according to at least two positions of the screen 1:

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

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

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 type, for example Philips PPX 34 117 W or LG PH150G or LG PF1000U etc.

The projector 2 is secured to the screen 1.

More exactly, the projector 2 is secured to the winder 14.

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

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

The device 102 forms a kakemono.

The projector 2 is arranged to project the image 3 on the screen 1 in a non-orthogonal direction 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 obstructs the view, 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 holding, by the reel 14, the screen 1 in its wound position. This second method embodiment of 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 wound position, for which the screen 1 is inaccessible for the projected image 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 maintained in each of these two positions by holding means respectively 14 and 13.

Then, the projector 2 projects the image 3 on the screen 1 (in its deployed position) in a non-orthogonal direction to the screen 1 so that the projector 2 is located between a user 15 and the screen 1 without the projector 2 obstructs 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 that have just been described and many adjustments can be made to these examples without departing from the scope of the invention.

Of course, the various features, shapes, variants and embodiments of the invention can be associated with each other in various combinations.

Claims

Display device (101, 102), 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 an alternation :

diffusion zones (4) arranged to diffuse light (6) from the projected image and

- Transparent areas (5) arranged to transmit through the screen of the light 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 of the side of the opposite face (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 received light intensity of at least one wavelength between 400 nm and 700 nm, of 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 received light intensity of at least one wavelength between 400 nm and 700 nm, preferably each wavelength between 400 nm and 700 nm.

5. Device according to any one of the preceding claims, characterized in that the transparent areas are interconnected 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.

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 μm and / or less than or equal to 3000 μm, and / or

a ratio width (DLorth) over length (DL) 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 zones in 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 a printing and / or etching and / or polishing (7) on a transparent support, each transparent zone comprising a lack 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 prints and / or etchings and / or polishes (7) are produced, the support further comprising a transparent surface (9). on which is spread the film.

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:

12. Device according to any one of the preceding claims, characterized in that an output (10) of the projector is located at a distance from the screen 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 non-orthogonal direction to the screen so that the projector can be located between a user and the screen without the projector obstructing the user's view of the projected image on the screen.

A method (101, 102) for displaying comprising projecting, by a projector (2), 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 areas (5) transmitting through the screen of the light of the projected image.