JP2004184483A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device on which a picture excellent in contrast and good in visibility is viewed by an observer even in the environment that gets external light such as sunlight. <P>SOLUTION: In the display device provided with a screen 1 attached to a window 12 which gets the external light 11 and a projector 2 projecting video light 3 toward the screen 1 obliquely, the screen 1 is provided with a Fresnel lens element deflecting the video light 3 projected from the projector 2 to the observer side, a lenticular lens element diffusing the video light 3 in a horizontal direction and a light absorption part restraining the reflection of the external light 11. The screen preferbly has reflectivity from the observer side of 2-10% and peak gain of 2-6 . <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a display device capable of projecting an image with excellent contrast onto a screen mounted on the indoor surface of a window exposed to external light.
[0002]
[Prior art]
A typical window in a store or a showroom (hereinafter, may be abbreviated as a store, etc.) is made of a transparent glass, a transparent plastic plate, or the like. Many cases are visible. In such stores and the like, in order to further improve the advertising effect and the like, a window display system in which a transparent screen is attached to the interior surface of a window and an image is projected on the screen has been studied (for example, Patent Document 1). See.).
[0003]
[Patent Document 1]
JP-A-2002-162686 (FIG. 1)
[0004]
[Problems to be solved by the invention]
However, the above-described window display system has a problem that the contrast of an image is reduced depending on the brightness of external light, and a projected image is extremely difficult to see.
[0005]
The present invention has been made in order to solve the above problems, and an object of the present invention is to provide an observer with an image with excellent contrast and good visibility even in an environment where external light such as sunlight shines. It is to provide a display device.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 for solving the above-mentioned problem is a display device comprising: a screen mounted on a window to which external light is applied; and a projector for projecting image light obliquely toward the screen. Has a Fresnel lens element that deflects the image light projected from the projector to the observer side, a lenticular lens element that diffuses the image light in the horizontal direction, and a light absorbing unit that suppresses reflection of external light. Has features.
[0007]
According to the present invention, since the screen has a light absorbing portion that suppresses reflection of external light, the reflection of external light can be suppressed, and the contrast of an image can be improved. As a result, an image with good visibility can be provided even in an environment where external light such as sunlight shines. Further, since the screen has a Fresnel lens element that deflects the image light in the direction of the observer and a lenticular lens element that diffuses the image light in the horizontal direction, an observer outside the store or showroom is projected on the screen. An image with good contrast can be easily observed.
[0008]
According to a second aspect of the present invention, in the display device according to the first aspect, the screen has a Fresnel lens sheet provided with a Fresnel lens element, and a lenticular lens sheet provided with a lenticular lens element, and the light absorbing portion is provided. Is a colored layer formed along the lens shape of the lenticular lens element.
[0009]
According to the present invention, the external light incident on the screen from the observer is attenuated while traveling while repeating total reflection in the colored layer. As a result, most of the external light is absorbed without being reflected, so that the contrast is improved and the visibility of the image projected on the screen is improved.
[0010]
According to a third aspect of the present invention, in the display device according to the first or second aspect, the screen has a reflectance from an observer side of 2 to 10% and a peak gain of 2 to 6. Has features.
[0011]
According to the present invention, since the reflectance and the peak gain are within the above ranges, the influence of the reflected light is small, and the visibility of the image projected on the screen is improved.
[0012]
According to a fourth aspect of the present invention, in the display device according to the first or second aspect, in an environment where external light of 100 to 1000 lux is applied, the reflectance of the screen from the observer side is 7 to 10%. Which is characterized in that the peak gain is 2 to 6. According to a fifth aspect of the present invention, in the display device according to the first or second aspect, in an environment where external light of 1000 to 3000 lux is applied, the reflectance of the screen from the observer side is 2 to 7%. Which is characterized in that the peak gain is 2 to 6.
[0013]
According to these inventions, since the reflectance and the peak gain of the screen are defined according to the respective external light environments, an image with excellent contrast and excellent visibility can be projected in the external light environment. .
[0014]
According to a sixth aspect of the present invention, in the display device according to any one of the first to fifth aspects, the screen has a thickness of 0.5 to 3 mm.
[0015]
ADVANTAGE OF THE INVENTION According to this invention, a screen is thin and it becomes easy to stick a window to the indoor surface.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
The display device of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an example of the display device of the present invention. FIG. 2 and FIG. 3 are configuration diagrams showing an example of a screen constituting the display device of the present invention. FIG. 4 is a principle diagram of a light absorption mechanism in the screen of FIG.
[0017]
As shown in FIG. 1, the display device of the present invention is a display device mounted on a store or a showroom, and a screen 1 mounted on an indoor surface 13 or an outdoor surface of a window 12 to which external light 11 is applied. And a projector 2 for projecting the image light 3 obliquely toward the screen 1. In this display device, as shown in FIGS. 2 and 3, the screen includes a Fresnel lens element 4 for deflecting the image light 3 projected from the projector 2 toward the observer 14, and the image light 3 in the horizontal direction. It has a lenticular lens element 6 for diffusing and a light absorbing section 8 for suppressing reflection of external light.
[0018]
(screen)
As long as the screen has the Fresnel lens element 4 and the lenticular lens element 6, even if it is an integrated screen of the Fresnel lens element 4 and the lenticular lens element 6, it is a composite in which sheets formed separately are superposed. The screen may be of a type, and is not particularly limited.
[0019]
FIG. 2 is a schematic view showing an example of an integrated screen including the Fresnel lens element 4 and the lenticular lens element 6. In the integrated screen 21, the Fresnel lens element 4 is formed on the projector side, and the lenticular lens element 6 is formed on the window side.
[0020]
FIG. 3 is a schematic diagram showing an example of a composite screen in which a Fresnel lens element 4 and a lenticular lens element 6 are provided on a Fresnel lens sheet 5 and a lenticular lens sheet 7, respectively. In the composite screen 31, the Fresnel lens element 4 is formed on the projector side of the Fresnel lens sheet 5, and the lenticular lens element 6 is formed on the projector side of the lenticular lens sheet 7, but each lens element is formed. The side is not particularly limited. For example, in FIG. 3, the Fresnel lens element 4 may be formed on the viewer side of the Fresnel lens sheet 5 (that is, on the lenticular lens sheet 7 side). Further, the lenticular lens element 6 may be formed on the viewer side. Thus, on which surface the Fresnel lens element 4 and the lenticular lens element 6 are formed is arbitrarily selected.
[0021]
Next, each function of the Fresnel lens element 4 and the lenticular lens element 6 will be described with reference to FIG.
[0022]
The Fresnel lens element 4 is a lens element for directing the image light 3 enlarged and projected from the projector 2 installed obliquely upward in the room, for example, to the direction of an observer. Acts as a bending convex lens. The screen 21 or the Fresnel lens sheet 5 provided with the Fresnel lens element 4 is usually provided with a concentric prism shape on the observer side, but in the display device of the present invention, the projector 2 is The screen 21 or the center of the Fresnel of the prism group of the Fresnel lens sheet 5 (the center of the concentric circle) does not exist in the screen or the sheet, and the screen or the sheet is installed. There is a Fresnel center above and outside. The Fresnel center is determined in relation to the position of the projector, and is located above when the position of the projector is above, below when the position of the projector is below, and on each side when there is both sides.
[0023]
At this time, it is preferable to design the deflection angle of the Fresnel lens element 4 in consideration of the height at which the screen is mounted and the height of the line of sight of the observer. For example, as shown in FIG. 1, when the projector 2 is installed on the ceiling and the height of the line of sight of the screen 1 and the observer 14 is almost the same, the image light 3 projected from the projector 2 Preferably, the Fresnel lens element 4 is designed to deflect so as to be parallel to the line. If the projector 2 is installed on the ceiling and the screen 1 is mounted at a position where the observer 14 looks up, the projector 2 It is preferable to design the Fresnel lens element 4 so as to deflect the image light 3 projected from the screen slightly below the normal line of the screen 1.
[0024]
The deflection angle and the method of designing the Fresnel lens element 4 for realizing the angle are determined by setting the position of the center of the Fresnel. For example, when the line of sight of the observer 14 is in front of the screen 1, it is preferable that the center of Fresnel be the same as the position of the projector 2 on the extended surface of the window 12. On the other hand, when the observer 14 looks up at the screen 1 slightly, it is preferable that the center of the Fresnel is located on the extended surface of the window 12 and lower than the position of the projector 2. The prism shape of the screen 21 or the Fresnel lens sheet 5 has a lower height as it approaches the center of Fresnel, and can refract the projected image light 3 smaller, and becomes steeper as the distance from the center of Fresnel increases. Thus, the projected image light 3 can be refracted more.
[0025]
The lenticular lens element 6 is provided closer to the observer than the Fresnel lens element 4 and functions to enlarge the viewing angle of the image light 3 deflected by the Fresnel lens element 4 toward the observer. In the screen 21 or the lenticular lens sheet 7 provided with the lenticular lens elements 6, the trapezoidal or semi-cylindrical lenticular lens elements 6 are usually arranged in the form of vertical stripes.
[0026]
For example, in FIG. 3, it is preferable that the lenticular lens sheet 7 contains a diffusing agent that spreads light in the vertical direction. Such a lenticular lens sheet can slightly enlarge the image light 3 also in the vertical direction.
[0027]
In the present invention, it is preferable that the light absorbing portion 8 is formed on the screen. In FIG. 2, the light absorbing portion 8 is formed along the colored layer formed in a stripe between the valleys of the adjacent lenticular lens elements 6, and is formed along the lens-shaped surface of the lenticular lens element 6 in FIG. A colored layer can be exemplified. In the case shown in FIG. 2, the light absorbing section 8 fills the valley of the lenticular lens element 6 with an ink containing a dye or a pigment that absorbs light or a UV curable resin by a wiping method or the like, and heat-drys. Or by curing by UV irradiation. In the case shown in FIG. 3, it can be formed by co-extruding a resin containing a dye or a pigment that absorbs light and a resin not containing the dye or the pigment.
[0028]
In the light absorbing portion 8 shown in FIG. 2, the width of the lenticular lens element 6 is preferably 40 to 70% of the pitch, and the thickness thereof is preferably 0.05 to 0.2 mm. On the other hand, in the light absorbing portion 8 shown in FIG. 3, it is preferable that the light absorbing portion 8 is formed with a thickness of 0.01 to 0.04 mm on the lenticular lens element.
[0029]
FIG. 4 is a principle diagram of a light absorption mechanism in the screen of FIG. The external light 11 incident on the screen travels while being totally reflected in the light absorbing portion formed on the surface of the lenticular lens sheet 7 on the projector side, so that most of the light is absorbed. On the other hand, since the image light 3 is deflected by the Fresnel lens element and is perpendicularly incident on the lenticular lens element 6, the length of light passing through the light absorbing portion 8 is short and absorption is minimized. Therefore, the image light 3 transmitted to the observer side is more remarkable than the external light 11 reflected to the observer side, so that the contrast is improved.
[0030]
The contrast of the screen is greatly affected by the ratio between the transmitted image light 3 and the reflected external light 11. Then, they can be evaluated by the peak gain and the reflectance of the screen. Note that the gain is obtained by measuring the angular distribution of the luminance of light coming in from the rear of the screen (on the projector side) and coming out of the screen, and calculating the gain G = π × luminance from the illuminance on the screen and each luminance. (Cd / m ² ) / Illuminance (lux). Note that the peak gain is the maximum gain value in the screen, and in the present application, indicates the maximum value of the gain when the center of the screen is observed from the front of the screen. In addition, the reflectivity is obtained from the ratio of reflected light (in all directions) to incident light when light is irradiated at an incident angle of 45 degrees, that is, “light amount of reflected light / light amount of incident light”. It is.
[0031]
Under an external light of 100 to 3000 lux, the peak gain of a screen exhibiting excellent contrast performance is in the range of 2 to 6, and the reflectance is in the range of 2 to 10%. If the peak gain is less than 2, the screen may be too dark and unsuitable for practical use. If the peak gain exceeds 6, the viewing angle may be too narrow and unsuitable for practical use. Further, it is quite difficult to realize the reflectance of less than 2%, and if the reflectance exceeds 10%, the contrast of the image is reduced and it becomes impossible to visually recognize the image. is there.
[0032]
The screen having such a contrast performance has a lenticular lens element 6 on the light incident surface such that the horizontal half-value angle is about 25 to 30 degrees, and a light absorbing portion 8 is provided at a portion along the lenticular lens element 6. A layer in which the thickness of the colored layer is about の of the pitch of the lenticular lens element 6 and the absorption of the colored layer is about 30% (for example, FIG. 3) See). Note that the horizontal half-value angle is a half-value angle of the peak gain in the horizontal direction, and is represented by αH.
[0033]
In the above description, the external light is set in the range of 100 to 3000 lux, but the display device of the present invention can exhibit preferable contrast performance under an external light environment within this range.
[0034]
In the present invention, the reflectivity of the screen is 2 to 7% in an environment where external light of 1000 to 3000 lux shines, for example, in an environment of a window along a sidewalk where sunlight may directly hit or shade. Yes, the peak gain is preferably 2 to 6. The screen having such a contrast performance has a lenticular lens element 6 on the light incident surface so that the horizontal half-value angle is about 25 to 30 degrees, and a light absorbing portion 8 is provided at a portion along the lenticular lens element. A layer is formed, and the thickness of the coloring layer is about ４ of the pitch of the lenticular lens element, and the absorption of the light absorbing layer is about 45% (for example, FIG. 3). See). In the description corresponding to claim 5, 1000 lux at 1000 to 3000 lux means "exceeds 1000 lux", and 7% at a reflectance of 2 to 7% means "less than 7%." It means "."
[0035]
Further, in an environment where external light of 100 to 1000 lux is applied, for example, in an environment where illumination light of approximately constant brightness is applied to a window 12 such as a store in an underground shopping mall or a department store, the reflectance of the screen is 7 to 10. %, And the peak gain is preferably 2 to 6. The screen having such a contrast performance has a lenticular lens element 6 having a horizontal half-value angle of about 25 to 30 degrees on the light exit surface, and a light absorbing section 8 at a position corresponding to a valley of the lenticular lens element 6. A configuration in which the width is 40 to 70% of the lenticular lens element pitch can be given (for example, see FIG. 2).
[0036]
In the display device of the present invention, by defining the reflectance and peak gain of the screen in accordance with the respective external light environments, it is possible to project an image having excellent contrast and excellent visibility in the external light environment. it can.
[0037]
The screen is adhered to the interior surface 13 of the window 12 with a transparent or translucent adhesive material such as a double-sided tape, or attached to a frame or a rail formed of a transparent resin or the like. It is preferable that the transparent or translucent adhesive material is adhered to the interior surface 13 or the exterior surface of the window 12, preferably the interior surface 3. Since the screen 1 mounted in this manner has no portion where an image cannot be displayed on the outer peripheral portion of the screen, the visibility can be improved. The screen preferably has a thickness of 3 mm or less. The reason why the thickness is 3 mm or less is preferable because the screen can be reduced in weight and it is convenient to stick or hang it on the window 12 without fixing. Particularly, it is preferable for a screen of 40 inches or more. The lower limit of the thickness of the screen is about 0.5 mm.
[0038]
Other conventionally known configurations may be added to the screen of the present invention as long as the features of the present invention are satisfied and the intended object of the present invention can be achieved.
[0039]
(projector)
A projector having a light output of 1000 to 3000 ANSI lumens is preferably used as the projector. In the present invention, since the projector projects image light onto a screen attached to a window exposed to external light, in order to display an image with high visibility, a projector having a light output in the above range, particularly a light valve type. A projector is preferably used. If the light output is less than 1000 ANSI lumens, the screen screen on which the image light is projected is too dark to be practical, and if the light output exceeds 3000 ANSI lumens, the projector becomes too large or a 200 volt power supply is required. , It is slightly inferior in practicality. Naturally, a projector having a high light output consumes a large amount of electric power. Therefore, from the viewpoint of running cost and energy saving, a projector having a light output in the above range is preferable.
[0040]
【Example】
Hereinafter, the display device of the present invention will be described based on specific examples.
[0041]
(Example 1)
The projector used had a light output of 2000 ANSI lumens and was mounted above the room.
[0042]
The screen 1 has a screen size of 50 inches (aspect ratio 4: 3, height 762 mm × width 1062 mm). The distance from the center of the screen 1 to the projector 2 (light source) is 2000 mm. The screen 1 was mounted on the interior surface 13 of the window 12 so that the incident angle of the image light 3 with respect to the line was 14 °. The screen 1 (31) is composed of a Fresnel lens sheet 5 and a lenticular lens sheet 7, and the focal length of the Fresnel lens sheet 5 is 2000 mm and the center of the Fresnel is 119 mm above the upper knitted end of the Fresnel lens sheet 5. The Fresnel lens element 4 is formed at a thickness of 1.5 mm, and the pitch of the Fresnel lens element 4 is 0.11 mm. The lenticular lens sheet 7 has a pitch of the lenticular lens element 6 of 0.14 mm, a horizontal half width of 25 °, a vertical half width of 9 °, a peak gain of 4, a coloring layer thickness of the light absorbing portion 8 of 30 μm, and a light absorbing portion. The absorption rate was 30% and the thickness was 1 mm. The reflectance at this time was 6.8%.
[0043]
The outer periphery of the Fresnel lens sheet 5 and the lenticular lens sheet 7 were adhered to each other with a double-sided tape, and mounted on the indoor surface 13 of the window 12.
[0044]
An image was projected on the display device of Example 1 thus configured, and the contrast of the image was observed from outside the room. As a result of observation from a position horizontal to the screen 1, an image could be clearly seen even under sunlight having a brightness of 1500 lux.
[0045]
(Example 2)
The projector used had a light output of 3000 ANSI lumens and was mounted above the room.
[0046]
The screen 1 has a screen size of 40 inches (aspect ratio 4: 3, 610 mm long × 813 mm wide), the distance from the center of the screen 1 to the projector 2 (light source) is 1500 mm, The screen 1 was mounted on the interior surface 13 of the window 12 so that the incident angle of the image light 3 with respect to the line was 20 °. The screen 1 (31) is composed of a Fresnel lens sheet 5 and a lenticular lens sheet 7, such that the focal length of the Fresnel lens sheet 5 is 1500 mm and the center of the Fresnel is located at the end of the upper long side of the Fresnel lens sheet 5. The Fresnel lens element 4 is formed, the thickness is 1 mm, and the pitch of the Fresnel lens element 4 is 0.068 mm. In the lenticular lens sheet 7, the pitch of the lenticular lens elements 6 is 0.087 mm, the horizontal half width is 30 °, the vertical half width is 12 °, the peak gain is 2.5, the thickness of the colored layer which is the light absorbing portion 8 is 20 μm, and the light absorption is The absorption rate of the portion 8 was 45% and the thickness was 1 mm. The reflectance at this time was 5.5%.
[0047]
The Fresnel lens sheet 5 and the lenticular lens sheet 7 were mounted on a transparent rail having a width of 5 mm, and mounted on the indoor surface 13 of the window 12 with double-sided tape.
[0048]
An image was projected on the display device of Example 2 configured in this manner, and the contrast of the image was observed from outside the room. As a result of observing the screen 1 upward at 5 °, the image could be clearly seen even under sunlight having a brightness of 3000 lux.
[0049]
(Example 3)
The projector used had a light output of 1000 ANSI lumens and was mounted above the room.
[0050]
The screen 1 has a screen size of 50 inches (aspect ratio 4: 3, height 762 mm × width 1062 mm). The distance from the center of the screen 1 to the projector 2 (light source) is 2000 mm. The screen 1 was mounted on a glass surface provided indoors so that the incident angle of the image light 3 with respect to the line was 14 °. The screen 1 (21) is an integrated screen including a Fresnel lens element 4 and a lenticular lens element 6. The Fresnel lens element 4 has a focal length of 200 mm, and the center of the Fresnel is on the upper long side end of the screen 21. The Fresnel lens element 4 is formed so as to be 119 mm above, and the pitch of the Fresnel lens element 4 is 0.11 mm. In this screen, the pitch of the lenticular lens element 6 is 0.14 mm, the horizontal half-value angle is 25 °, the vertical half-value angle is 9 °, the peak gain is 5, the width of the light absorbing portion is 0.084 mm at 60% of the pitch. Has a thickness of 1 mm. The reflectance at this time was 9%.
[0051]
The peripheral portion of the screen 21 was attached to a glass surface installed in a room with a double-sided tape and attached.
[0052]
An image was projected on the display device of Example 3 thus configured, and the image was observed indoors. As a result of observation from a position horizontal to the screen 1, an image could be clearly seen in a room of 1000 lux.
[0053]
(Comparative Example 1)
A display device of Comparative Example 1 was constructed in the same manner as in Example 1 except that the screen 1 was a diffusion sheet having a thickness of 5 mm. This diffusion sheet is obtained by dispersing minute beads (average particle diameter: 12 microns) having different refractive indexes in a transparent acrylic plate. This screen has a peak gain of 1, a reflectance of 20%, a horizontal half-value angle of 25 degrees, and a vertical half-value angle of 25 degrees.
[0054]
An image was projected on the display device of Comparative Example 1 thus configured, and the contrast of the image was observed from outside the room. As a result of observation from a position horizontal to the screen 1, there was no contrast of the screen under sunlight of a brightness of 1500 lux, and almost no image could be visually recognized.
[0055]
(Comparative Example 2)
A display device of Comparative Example 2 was configured in the same manner as in Example 2 except that the screen 1 was a diffusion sheet having a thickness of 3 mm. The diffusion sheet is the same as that of Comparative Example 1 except for the thickness. This screen has a peak gain of 1.5, a reflectance of 18%, a horizontal half-value angle of 20 degrees, and a vertical half-value angle of 20 degrees.
[0056]
An image was projected on the display device of Comparative Example 2 thus configured, and the contrast of the image was observed from outside the room. As a result of observing the screen 1 upward at 5 °, there was no image contrast and almost no image could be visually recognized under sunlight having a brightness of 3000 lux.
[0057]
(Comparative Example 3)
A display device of Comparative Example 3 was configured in the same manner as in Example 3 except that the screen 1 was a diffusion sheet having a thickness of 3 mm. The diffusion sheet is the same as that of Comparative Example 1 except for the thickness. This screen has a peak gain of 1.5, a reflectance of 18%, a horizontal half-value angle of 20 degrees, and a vertical half-value angle of 20 degrees.
[0058]
An image was projected on the display device of Comparative Example 3 configured as described above, and the contrast of the image was observed from outside the room. As a result of observation from a position horizontal to the screen 1, in a room having a brightness of 1000 lux, the contrast of the image was poor, so that a slightly whitish image could be visually recognized.
[0059]
【The invention's effect】
As described above, according to the display device of the present invention, since the screen has the light absorbing portion that suppresses reflection of external light, the reflection of external light can be suppressed, and the contrast of an image can be improved. be able to. As a result, an image with good visibility can be provided even in an environment where external light such as sunlight shines. Further, since the screen has a Fresnel lens element that deflects the image light in the direction of the observer and a lenticular lens element that diffuses the image light in the horizontal direction, an observer outside the store or showroom is projected on the screen. An image with good contrast can be easily observed.
[0060]
Further, according to the display device of the present invention, since external light incident on the screen from the viewer side attenuates while traveling while repeating total reflection in the colored layer, most of the external light is absorbed without being reflected. Is done. As a result, the contrast is further improved, and the visibility of the image projected on the screen can be improved.
[0061]
Further, according to the display device of the present invention, since the reflectance and the peak gain are defined within the specific ranges, the influence of the reflected light can be reduced, and the visibility of the image projected on the screen can be improved. .
[0062]
Further, according to the display device of the present invention, since the reflectance and the peak gain of the screen are defined according to the respective external light environments, an image with excellent contrast and excellent visibility is projected in the external light environment. be able to.
[0063]
Further, according to the display device of the present invention, since the screen is thin, it is easy to attach the window to the indoor surface.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an example of a display device of the present invention.
FIG. 2 is a configuration diagram showing an example of a screen constituting the display device of the present invention.
FIG. 3 is a configuration diagram showing another example of a screen constituting the display device of the present invention.
FIG. 4 is a principle view of a light absorption mechanism in the screen of FIG.
[Explanation of symbols]
1, 21, 31 screen
2 Projector
3 Video light
4 Fresnel lens elements
5 Fresnel lens sheet
6 Lenticular lens elements
7 Lenticular lens sheet
8 Light absorbing part
11 Outside light
12 windows
13 Indoors
14 Observer

Claims (6)

A display device having a screen mounted on a window exposed to external light and a projector that projects video light obliquely toward the screen,
The screen has a Fresnel lens element that deflects the image light projected from the projector toward the observer, a lenticular lens element that diffuses the image light in the horizontal direction, and a light absorbing unit that suppresses reflection of external light. A display device characterized by the above-mentioned. The screen includes a Fresnel lens sheet having a Fresnel lens element, and a lenticular lens sheet having a lenticular lens element, and the light absorbing portion is formed so as to conform to the lens shape of the lenticular lens element. The display device according to claim 1, wherein the display device is a layer. 3. The display device according to claim 1, wherein the screen has a reflectance from an observer side of 2 to 10% and a peak gain of 2 to 6. 4. The environment according to claim 1, wherein the screen has a reflectance of 7 to 10% from the observer side and a peak gain of 2 to 6 in an environment where external light of 100 to 1000 lux is applied. Item 3. The display device according to Item 2. The environment according to claim 1, wherein the screen has a reflectivity from the observer side of 2 to 7% and a peak gain of 2 to 6 in an environment where external light of 1000 to 3000 lux is applied. Item 3. The display device according to Item 2. The display device according to claim 1, wherein the screen has a thickness of 0.5 to 3 mm.

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