JP2006113383A - Transmission type screen and rear projection type display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate distortion of a display image and to enlarge a vertical view angle while suppressing "surge", in a rear projection type display device. <P>SOLUTION: As a transmission screen for the rear projection type display device, the transmission screen where a vertical lenticular lens 11 having a vertical lenticular lens sheet 11-4 and a black stripe 11-5; a horizontal lenticular lens 12 having a horizontal lenticular lens sheet 12-2 and a black stripe 12-3; and a Fresnel lens 13 having a Fresnel lens sheet 13-1 are arranged in order from the observer side, is used. For the vertical lenticular lens 11 and the Fresnel lens 13, glasses 11-2 and 13-2 are used respectively as a substrate. For the horizontal lenticular lens 12, a surface 12-1a on the observer side is subjected to an anti-glare treatment. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a transmission screen for a rear projection display device and a rear projection display device.

  As a kind of large-screen image display device, a rear projection display device (rear projection display) is widely used. As is well known, the rear projection type display device reflects and enlarges the image light emitted from the image light source such as a CRT, LCD element or DLP (Digital Light Processing) element by a mirror and projects it from the back to the transmission type screen. The image is viewed from the front side of the transmissive screen.

  In a rear projection display device, in general, the incident angle of light from a mirror to a transmission screen is steep for the purpose of downsizing an optical system (shortening the optical path length). For this reason, the transmissive screen is provided with a Fresnel lens sheet that collimates the image light from the mirror (converts it into light in a direction perpendicular to the screen surface).

  Further, the transmissive screen is provided with a lenticular lens sheet (having a black stripe in a region where the image light does not pass) for deflecting the image light that has been collimated by the Fresnel lens for the purpose of expanding the viewing angle. Yes.

  In a transmission screen for a rear projection display device that has been put into practical use, a resin has been used as a substrate on which the Fresnel lens sheet or the lenticular lens sheet is bonded. (However, in the literature, it has also been proposed to use glass as a substrate for a horizontal lenticular lens sheet for the purpose of preventing warpage due to changes in temperature and humidity (see, for example, Patent Document 1)).

In addition, a transmissive screen for a rear projection display device that has been put to practical use in the past is provided with only a horizontal lenticular lens sheet that deflects image light in the horizontal direction (enlarges the viewing angle in the horizontal direction) as a lenticular lens sheet. It was. (However, in the literature, it has also been proposed to provide both a horizontal lenticular lens sheet and a vertical lenticular lens sheet that deflects image light in the vertical direction (see, for example, Patent Document 2)).
JP 2002-357868 (paragraph number 0014, FIG. 1) Japanese Patent Laid-Open No. 8-101459 (paragraph numbers 0021 to 22, FIG. 1)

  However, a conventional transmission screen using a resin substrate has a problem in that it is difficult to maintain the flatness of the resin, and the display image is distorted.

  In the transmissive screen described in Patent Document 1, glass is used as the substrate for the horizontal lenticular lens sheet, but resin is used as the substrate for the Fresnel lens sheet. Therefore, since it is difficult to maintain the flatness of the resin substrate for the Fresnel lens sheet, the display image is also distorted.

  Moreover, the vertical viewing angle cannot be expanded in a transmission screen provided with only a horizontal lenticular lens sheet as a lenticular lens sheet as in the prior art.

  If a vertical lenticular lens is additionally provided as described in Patent Document 2, the viewing angle in the vertical direction can be increased. However, when a vertical lenticular lens is simply added, external light that has entered the transmission screen from the observer side passes through the vertical lenticular lens, and is then reflected by the surface of the horizontal lenticular lens to return to the observer side again. It will be emitted. Then, due to the intensity of the reflected light from the portion of the surface of the horizontal lenticular lens, unevenness of the display image (“swell”) occurs.

  In view of the above-described points, the present invention has been made in the rear projection type display device to improve the distortion of the display image and to enlarge the viewing angle in the vertical direction while suppressing the “undulation”. is there.

  In order to solve this problem, a transmission screen according to the present invention includes a vertical wrench having a vertical lenticular lens sheet and a black stripe, a horizontal wrench having a horizontal lenticular lens sheet and a black stripe, and a Fresnel, as viewed from the observer side. Fresnel with lens sheet is arranged in order, and this vertical wrench and Fresnel use glass as a substrate respectively, and this horizontal wrench is characterized by anti-glare treatment on the observer side surface And

  In this transmissive screen, a vertical wrench, a horizontal wrench, and a Fresnel are arranged in this order as seen from the observer side. Glass is placed on both the vertical wrench facing the observer side and the Fresnel facing the opposite side (light source side). Used as a substrate.

  Thereby, since the flatness of both surfaces of the transmissive screen can be kept good, the distortion of the display image can be greatly improved as compared with the conventional case.

  In addition, since this transmissive screen is provided with not only a horizontal lenticular lens sheet but also a vertical lenticular lens sheet, the viewing angle in the vertical direction can be increased. And since the surface on the observer side of the horizontal wrench has been anti-glare treated, the external light incident on the transmission screen from the observer side and transmitted through the vertical lenticular lens sheet is the surface on the observer side of the horizontal wrench. Diffuse and reflected. As a result, the uniformity of the intensity of the light reflected from the surface on the observer side and emitted to the observer side is increased, so that “swell” (unevenness of the display image due to the intensity of the reflected light by the part is generated). ) Can be suppressed.

  In addition, since the vertical wrench is located closest to the observer, external light from above and below, such as external light from indoor ceiling luminaires, is removed from the black stripes of the vertical wrench (black that extends horizontally). It is possible to block well with stripes.

  In addition, stray light in the Fresnel is blocked by both the black stripe of the horizontal wrench and the black stripe of the vertical wrench (the black stripe that intersects the light traveling direction in a cross shape), so stray light is emitted to the observer side. And the phenomenon that multiple images can be seen can be suppressed.

  The surface roughness of the horizontal wrench on the observer side (surface subjected to anti-glare treatment) is preferably in the range of 2 μm to 7 μm as an example. In this transmissive screen, not only the horizontal wrench but also the vertical wrench is provided, so if the surface roughness of the horizontal wrench is too large, the amount of light blocked by the black stripe will increase. The light transmittance in the screen is reduced. On the other hand, by keeping the surface roughness of the observer side of the horizontal wrench to about 2 to 7 μm, while suppressing the “swell”, the blocking light at the black stripe is reduced, and in the transmissive screen It is possible to suppress a decrease in light transmittance.

  In this transmissive screen, as an example, it is preferable that the vertical wrench is provided with a diffusion sheet closer to the observer side than the vertical lenticular lens sheet. By providing such a diffusion sheet, the viewing angle in the vertical direction can be further expanded. In addition, by providing a diffusion sheet closer to the observer side than the vertical lenticular lens sheet, the light diffused by the diffusion sheet is not blocked by the black stripe of the vertical wrench. A decrease in transmittance can also be prevented.

  As the diffusion sheet of this vertical wrench, it is more preferable to use a substrate sheet in which a diffusion layer is formed on the surface on the observer side. This ensures a certain distance between the black stripe of the vertical wrench and the diffusion layer. If the distance between the black stripe and the diffusion layer becomes too short, the light beam focused by the black stripe will vary between where it hits the particles in the diffusion layer and where it does not, so that when displaying a bright image, Glare (“scintillation”) occurs. On the other hand, by securing a certain distance as described above, this “scinlation” can also be suppressed.

  In this transmission screen, as an example, it is preferable that the vertical wrench is provided with either an antiglare sheet or an antireflection sheet on the surface on the observer side. Thereby, reflection on the surface of the transmission screen can be suppressed.

  In this transmissive screen, as an example, it is more preferable that the Fresnel is provided with an antiglare sheet on the surface opposite to the observer side (light source side). When the light incident on the transmissive screen from the image light source through the mirror in the rear projection display device is reflected by the surface of the Fresnel and returns to the mirror, the reflected light is reflected again by the mirror and enters the transmissive screen. This causes a ghost in the display image. On the other hand, this ghost can also be suppressed by providing such an anti-glare sheet in Fresnel.

  The surface roughness of the Fresnel antiglare sheet is also preferably about 2 to 7 μm. Accordingly, it is possible to reduce the blocking light in the black stripe of the horizontal wrench and the black stripe of the vertical wrench while suppressing the ghost.

  Also, in this transmissive screen, when a resin is used as a substrate for a horizontal wrench, as an example, a vertical wrench substrate (glass) and a Fresnel substrate (glass) are assumed assuming that the resin is stretched due to changes in temperature and humidity. It is preferable that the horizontal wrench is fixed to one of the vertical wrench and the Fresnel.

  Thus, by reducing the size of the resin substrate, the influence of temperature and humidity can be eliminated. In addition, by fixing and attaching to either the vertical wrench or Fresnel in this way, it is possible to prevent the horizontal wrench with a reduced size from moving between the vertical wrench and the Fresnel ("rambling"). it can.

  In this transmission screen, as an example, it is preferable to provide a spacer between the horizontal wrench and the Fresnel. Thereby, the lens surface of the horizontal lenticular lens sheet and the lens surface of the Fresnel lens sheet are not in direct contact with each other, so that deformation of these lenses can be prevented.

  Further, it is more preferable to provide this spacer with a gap instead of providing it over the entire circumference. Thereby, moisture between the horizontal wrench and the Fresnel can be extracted outside through this gap.

  Next, the present invention is a rear projection type display device including an image light source that emits image light and a transmissive screen on which the image light is projected from the back, and the transmissive screen is viewed from the observer side. A vertical wrench having a vertical lenticular lens sheet and a black stripe, a horizontal wrench having a horizontal lenticular lens sheet and a black stripe, and a Fresnel having a Fresnel lens sheet are arranged in this order. This horizontal wrench used as a substrate is characterized in that the surface on the viewer side is subjected to anti-glare treatment.

  This rear projection display device uses the transmission screen according to the present invention described above, improves the distortion of the displayed image, and expands the vertical viewing angle while suppressing the “swell”. Can do. In addition, it can block out external light (external light from the top and bottom, such as external light from indoor lighting fixtures in the room), and suppresses the phenomenon of stray light being emitted to the viewer and the appearance of multiple images. can do.

  According to the present invention, in the rear projection type display device, an effect that the distortion of the display image can be improved, an effect that the viewing angle in the vertical direction can be expanded while suppressing “swell” (shading unevenness of the display image), It is possible to effectively block external light (external light from the vertical direction such as external light from indoor lighting fixtures), and to suppress the phenomenon that stray light is emitted to the observer side and multiple images can be seen. An effect is obtained.

  In addition, by reducing the surface roughness of the observer side of the horizontal wrench (anti-glare-treated surface) to about 2 to 7 μm, the “swell” is suppressed and the blocking light at the black stripe is reduced. Moreover, the effect that the fall of the transmittance | permeability of the light in a transmissive screen can be suppressed is also acquired.

  In addition, by providing a diffusion sheet closer to the observer side than the vertical lenticular lens sheet of the vertical wrench, the viewing angle in the vertical direction is further expanded, and the light transmittance in the transmission screen is reduced. The effect that it can prevent is also acquired.

  In addition, by using a diffusion sheet formed on the surface of the base sheet on the observer side as the diffusion sheet of the vertical wrench, an effect of suppressing “scinlation” (image glare) can be obtained. .

  Further, by providing either an anti-glare sheet or an anti-reflection sheet on the surface on the observer side of the vertical wrench, an effect of suppressing reflection on the surface of the transmission screen can be obtained.

  Moreover, the effect that a ghost can be suppressed is also acquired by providing an anti-glare sheet | seat on the surface on the opposite side to the observer side of Fresnel.

  In addition, the surface roughness of the Fresnel anti-glare sheet is reduced to about 2 to 7 μm, so that the ghost is suppressed and the blocking light at the black stripe of the horizontal wrench and the black stripe of the vertical wrench is reduced. The effect that the fall of the transmittance | permeability of the light inside can be suppressed is also acquired.

  In addition, the size of the resin used as the substrate for the horizontal wrench is smaller than that of the vertical wrench substrate (glass) and Fresnel substrate (glass), and the horizontal wrench is fixed and attached to either the vertical wrench or Fresnel. In addition, it is possible to prevent the horizontal wrench from “rambling” (the horizontal wrench moving between the vertical wrench and the Fresnel) while eliminating the influence of temperature and humidity.

  In addition, by providing a spacer between the horizontal wrench and the Fresnel, the lens surface of the horizontal lenticular lens sheet and the lens surface of the Fresnel lens sheet are not in direct contact, so that the effect of preventing deformation of those lenses is also obtained. It is done.

  By providing this spacer with a gap, an effect that moisture between the horizontal wrench and the Fresnel can be extracted to the outside is also obtained.

  Hereinafter, the present invention will be specifically described with reference to the drawings. FIG. 1 is a diagram showing an outline of an optical system of a rear projection display device to which the present invention is applied. The video light source 1 is composed of, for example, a CRT, LCD element, or DLP (Digital Light Processing) element, and is driven according to video data from a video signal processing system (not shown) to emit video light.

  The image light emitted from the image light source 1 is reflected and enlarged by the mirror 2 and projected from the back onto the transmissive screen 3 and is emitted from the transmissive screen 3 to the observer.

  FIG. 2 is a diagram showing a cross-sectional structure of the transmission screen 3. On the transmissive screen 3, a vertical wrench 11, a horizontal wrench 12, and a Fresnel 13 are arranged in this order as viewed from the observer side (left side in the figure).

  In the vertical wrench 11, a glass substrate 11-2 is used as a substrate. An anti-glare (AG) sheet 11-1 is bonded to the surface on the observer side of the glass substrate 11-2 with an adhesive 11-6. The anti-glare sheet 11-1 has an anti-glare layer (a layer in which particles having a refractive index equal to the binder are arranged on the surface of the binder) 11-1b that diffuses incident light on the surface of the base sheet 11-1a on the observer side. Formed.

  A diffusion sheet 11-3 is bonded to the surface of the glass substrate 11-2 opposite to the observer side (the light source side where the video light source 1 and the mirror 2 in FIG. 1 are present) with an adhesive 11-7. . The diffusion sheet 11-3 has a diffusion layer (a layer in which particles having a refractive index different from that of the binder are disposed in the binder) 11-3b on the surface of the base sheet 11-3a on the viewer side. Formed.

  A vertical lenticular lens sheet 11-4 is bonded to the light source side surface of the diffusion sheet 11-3 with an adhesive 11-8. The vertical lenticular lens sheet 11-4 is obtained by forming the vertical lenticular lens 11-4b on the light source side surface of the base sheet 11-4a. In the adhesive 11-8, black stripes (BS) 11-5 extending in the horizontal direction (direction perpendicular to the drawing) are mixed.

  The vertical lenticular lens sheet 11-4 plays a role of expanding the viewing angle in the vertical direction by deflecting the image light incident from the horizontal wrench 12 in the vertical direction (vertical direction in the figure). The black stripe 11-5 is located in a region where the image light deflected by the vertical lenticular lens sheet 11-4 does not pass and plays a role of blocking outside light. The diffusion sheet 11-3 serves to expand the viewing angle in the vertical direction by diffusing transmitted light.

  The horizontal wrench 12 uses a resin substrate 12-1 as a substrate. An observer-side surface 12-1a of the resin substrate 12-1 faces the vertical wrench 11, and this surface 12-1a is subjected to anti-glare treatment. A horizontal lenticular lens sheet 12-2 is bonded to the surface of the resin substrate 12-1 on the light source side with an adhesive 12-4. The horizontal lenticular lens sheet 12-2 is obtained by forming a horizontal lenticular lens 12-2b on the light source side surface of the base sheet 12-2a. Black stripes (BS) 12-3 extending in the vertical direction are mixed in the adhesive 12-4.

  The horizontal lenticular lens sheet 12-2 plays a role of expanding the horizontal viewing angle by deflecting the image light incident from the Fresnel 13 in the horizontal direction. The black stripe 12-3 is located in a region where the image light deflected by the horizontal lenticular lens sheet 12-2 does not pass and plays a role of blocking outside light.

  In the Fresnel 13, a glass substrate 13-2 is used as a substrate. A Fresnel lens sheet 13-1 is bonded to the surface on the observer side of the glass substrate 13-2 with an adhesive 13-4. The Fresnel lens sheet 13-1 is obtained by forming a Fresnel lens 13-1b on the surface on the observer side of the base sheet 13-1a.

  An anti-glare (AG) sheet 13-3 is bonded to the light source side surface of the glass substrate 13-2 with an adhesive 13-5. The antiglare sheet 13-3 is obtained by forming an antiglare layer (having a function as a diffusion layer) 13-3b on the light source side surface of the base sheet 13-3a.

  The Fresnel lens sheet 13-1 plays a role of collimating the image light from the mirror 2 in FIG. 1 (converting it into light in a direction perpendicular to the screen surface).

  The thickness of the glass substrate 11-2 of the vertical wrench 11 and the glass substrate 13-2 of Fresnel 13 are each about 3 mm. The thickness of the resin substrate 12-1 of the horizontal wrench 12 is about 1.2 mm. In the diffusion sheet 11-3 of the vertical wrench 11, the thickness of the base sheet 11-3a is about 180 to 250 μm. The thickness of each other sheet is about 100 μm.

  The image light projected from the mirror 2 of FIG. 1 onto the transmissive screen 3 is collimated by the Fresnel 13, expanded in the horizontal viewing angle by the horizontal wrench 12, and then viewed in the vertical direction by the vertical wrench 11. Is enlarged and emitted to the observer.

  In this transmissive screen 3, a vertical wrench 11, a horizontal wrench 12 and a Fresnel 13 are arranged in this order as viewed from the observer side, and the substrate is formed by both the vertical wrench 11 facing the observer side and the Fresnel 13 facing the light source side. Glass substrates 11-2 and 13-2 are used.

  Thereby, since the flatness of both surfaces of the transmissive screen 3 can be kept good, the distortion of the display image can be greatly improved as compared with the conventional case.

  In addition, since the transmissive screen 3 is provided with not only the horizontal lenticular lens sheet 12-2 but also the vertical lenticular lens sheet 11-4, the viewing angle in the vertical direction can be increased.

  Here, when the external light that has entered the transmission screen 3 from the observer side and has passed through the vertical wrench 11 is reflected by the horizontal wrench 12 and is emitted again to the observer side, a portion of the surface of the horizontal wrench 12 is obtained. Due to the intensity of the reflected light due to the light, unevenness of the display image (“swell”) occurs. On the other hand, in this transmissive screen 3, since the surface on the observer side (the surface 12-1a on the observer side of the resin substrate 12-1) of the horizontal wrench 12 is subjected to anti-glare processing, from the observer side The external light that has entered the transmissive screen 3 and has passed through the vertical wrench 11 is diffused and reflected by the surface of the horizontal wrench 12 on the observer side. As a result, the uniformity of the intensity of light reflected from the surface on the observer side and emitted to the observer side is increased, so that this “swell” can be suppressed.

  Further, in this transmissive screen 3, the vertical wrench 11 is arranged closest to the observer side, so that external light from the vertical direction, such as external light from a lighting device on the ceiling of the room, is transmitted to the vertical wrench 11. The black stripe 11-5 can block well.

  Further, stray light in the Fresnel 13 is blocked by both the black stripes 12-3 of the horizontal wrench 12 and the black stripes 11-5 of the vertical wrench 11 (black stripes that cross in a cross shape with respect to the light traveling direction). Therefore, it is possible to suppress the phenomenon in which stray light is emitted to the observer side and multiple images are visible.

  Moreover, in this transmissive screen 3, since the diffusion sheet 11-3 is provided on the vertical wrench 11, the viewing angle in the vertical direction can be further expanded. The diffusion sheet 11-3 is provided closer to the observer than the vertical lenticular lens sheet 11-4 (and thus closer to the observer than the adhesive 11-7 mixed with the black stripe 11-5). Therefore, the light diffused by the diffusion sheet 11-3 is not blocked by the black stripe 11-5. Therefore, a decrease in light transmittance within the transmissive screen 3 is prevented.

  Further, as the diffusion sheet 11-3, a sheet in which the diffusion layer 11-3b is formed on the surface of the base sheet 11-3a on the observer side is used, so the black stripe 11-5 and the diffusion layer 11- A certain distance (a distance of 180 to 250 μm, which is the thickness of the base material sheet 11-3a) is ensured with respect to 3b. If the distance between the black stripe 11-5 and the diffusion layer 11-3b becomes too short, there will be variations between the places where the light beam focused by the black stripe 11-5 hits the particles in the diffusion layer 11-3b and the places where it does not hit. As a result, image glare ("scinulation") occurs when a bright image is displayed. On the other hand, by securing a certain distance as described above, this “scinlation” can also be suppressed.

  Further, in the transmissive screen 3, since the anti-glare sheet 11-1 is provided on the surface of the vertical wrench 11 on the observer side, reflection on the surface of the transmissive screen 3 can be suppressed.

  In the transmissive screen 3, an antiglare sheet 13-3 is provided on the surface of the Fresnel 13 on the light source side. When light incident on the transmission screen 3 from the image light source 1 via the mirror 2 is reflected by the surface of the Fresnel 13 and returns to the mirror 2, the return light is reflected again by the mirror 2 and enters the transmission screen 3. This causes a ghost in the display image. On the other hand, by providing such an antiglare sheet 13-3 on the Fresnel 13, light is diffused and reflected on the surface of the Fresnel 13, so that this ghost can also be suppressed.

Note that the surface roughness of the observer-side surface 12-1a (the observer-side surface of the horizontal wrench 12) on which the anti-glare treatment of the resin substrate 12-1 of the horizontal wrench 12 is within the range of 2 to 7 μm. It has become. Table 1 below shows the basis for determining this surface roughness.

  In this transmissive screen 3, since not only the horizontal wrench 12 but also the vertical wrench 11 is provided, if the surface roughness of the surface of the horizontal wrench 12 is set to a large value exceeding 8 μm, the black stripe 12-3 or Since the light blocked by 11-5 increases, the light transmittance in the transmissive screen 3 ("gain" in the lower part of Table 1) decreases.

  Conversely, when the surface roughness of the surface 12-1a on the observer side of the resin substrate 12-1 is set to a small value such as less than 1 μm, the light enters the transmission screen 3 from the observer side and passes through the vertical wrench 11. Since the outside light is not sufficiently diffused on the surface of the horizontal wrench 12 on the observer side, “undulation” cannot be suppressed (middle of Table 1).

  On the other hand, by reducing the surface roughness of the surface 12-1a on the observer side of the resin substrate 12-1 to about 2 to 7 μm, while suppressing “swell”, the black stripes 12-3 and 11-5 Therefore, it is possible to suppress a decrease in light transmittance in the transmissive screen 3.

Further, the surface roughness of the antiglare layer 13-3b (surface on the light source side of Fresnel 13) of the antiglare sheet 13-3 of Fresnel 13 is also in the range of 2 μm to 7 μm. Table 2 below shows the basis for determining this surface roughness.

  If the surface roughness of the surface of the Fresnel 13 is set to a large value exceeding 8 μm, the amount of light blocked by the black stripes 12-3 and 11-5 increases. Transmittance (“gain” in the lower part of Table 2) decreases.

  Conversely, if the surface roughness of the antiglare layer 13-3b is set to a small value such as less than 1 μm, the reflected light is not sufficiently diffused on the surface of the Fresnel 13, so that a ghost caused by the return light to the mirror 2 is generated. It becomes impossible to suppress.

  On the other hand, by limiting the surface roughness of the antiglare layer 13-3b to about 2 to 7 μm, the transmissive screen 3 reduces the blocking light at the black stripes 12-3 and 11-5 while suppressing ghost. It is possible to suppress a decrease in the light transmittance inside.

  The surface roughness of the antiglare sheet 11-1 of the vertical wrench 11 is larger than the above-mentioned value of 2 to 7 μm. Therefore, the diffusion density of light with the vertical wrench 11 is larger than that with the horizontal wrench 12 or Fresnel 13. As described above, each of the vertical wrench 11, the horizontal wrench 12, and the Fresnel 13 has a light diffusion function, and each diffusion density is appropriately determined, so that moire is suppressed and “undulation” is suppressed. Various problems such as suppression of a decrease in light transmittance and improvement of the viewing angle in the vertical direction can be solved in a balanced manner.

  Next, FIG. 3 is a diagram showing the relationship between the external size of the vertical wrench 11 and Fresnel 13 of the transmission screen 3 and the external size of the horizontal wrench 12. The substrate of the vertical wrench 11 (the glass substrate 11-2 in FIG. 2) and the Fresnel substrate (the glass substrate 13-2 in FIG. 2) have the same size. Therefore, the vertical wrench 11 and the Fresnel 13 have the same outer size. It has become.

  On the other hand, since the horizontal wrench 12 uses a resin (resin substrate 12-1 in FIG. 2) as a substrate, the size of the resin substrate 12-1 is assumed assuming that the resin is stretched due to changes in temperature and humidity. Is smaller than the glass substrates 11-2 and 13-2 of the vertical wrench 11 and Fresnel 13. Accordingly, the outer size of the horizontal wrench 12 is smaller than that of the vertical wrench 11 and Fresnel 13.

  4 to 6 are views showing how the transmissive screen 3 is assembled. As shown in FIG. 4, a spacer 21 is provided between the horizontal wrench 12 and the Fresnel 13. Thereby, the lens surface of the horizontal lenticular lens 12-2b of the horizontal lenticular lens sheet 12-2 shown in FIG. 2 and the lens surface of the Fresnel lens 13-1b of the Fresnel lens sheet 13-1 are not in direct contact with each other. The deformation of the lens can be prevented.

  The spacer 21 is not provided over the entire circumference, but is provided with a gap 22 at each of the vertical and horizontal positions. Thereby, moisture between the horizontal wrench 12 and the Fresnel 13 can be extracted outside through the gap 22.

  As shown in FIG. 5, the horizontal wrench 12 is fixedly attached to the vertical wrench 11 with a double-sided tape 23. As a result, the horizontal wrench 12 is reduced in size to eliminate the influence of temperature and humidity, while the horizontal wrench 12 is “running” (the horizontal wrench 12 having a reduced size moves between the vertical wrench 11 and the Fresnel 13. Can be prevented.

  As shown in FIG. 6, the vertical wrench 11, the horizontal wrench 12 and the Fresnel 13 are held together by a cushion tape 24 attached so as to surround the periphery. Thereby, it is possible to prevent the vertical wrench 11, the horizontal wrench 12, and the Fresnel 13 from being damaged when the transmissive screen 3 is mounted in the rear projection display device using the mounting tool.

  And this cushion tape 23 is not affixed over the perimeter, but is affixed with the clearance gap 25 in each position of the upper and lower sides, and right and left. As a result, moisture between the vertical wrench 11 and the horizontal wrench 12 and moisture between the horizontal wrench 12 and Fresnel 13 can be extracted to the outside through the gap 25.

  In the above example, as shown in FIG. 2, the antiglare sheet 11-1 is bonded to the surface on the observer side of the glass substrate 11-2 of the vertical wrench 11. However, as another example, an anti-reflection sheet (a sheet that removes reflected light using the light interference effect) may be bonded to the surface of the observer side of the glass substrate 11-2.

  In the above example, the horizontal wrench 12 is fixedly attached to the vertical wrench 11 as shown in FIG. However, the present invention is not limited to this, and the horizontal wrench 12 may be fixedly attached to the Fresnel 13, and in this case, the “wrack” of the horizontal wrench 12 can also be prevented.

It is a figure which shows the outline | summary of the optical system of the rear projection type display apparatus to which this invention is applied. It is a figure which shows the cross-section of the transmissive screen of FIG. It is a figure which shows the relationship between the external size of the vertical wrench and Fresnel of FIG. 2, and the external size of a horizontal wrench. It is a figure which shows the mode of an assembly of a transmissive screen. It is a figure which shows the mode of an assembly of a transmissive screen. It is a figure which shows the mode of an assembly of a transmissive screen.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Image light source, 2 Mirror, 3 Transmission type screen, 11 Vertical wrench, 11-1 Anti-glare sheet, 11-2 Glass substrate, 11-3 Diffusion sheet, 11-3b Diffusion layer of diffusion sheet, 11-4 Vertical lenticular lens sheet 11-5 Black stripe, 12 Horizontal wrench, 12-1 Resin substrate, 12-1a Observer side surface (surface subjected to anti-glare treatment), 12-2 Horizontal lenticular lens sheet, 12-3 Black Stripe, 13 Fresnel, 13-1 Fresnel lens sheet, 13-2 glass substrate, 13-3 anti-glare sheet, 21 spacer, 23 double-sided tape, 24 cushion tape

Claims (11)

Viewed from the observer side, a vertical wrench having a vertical lenticular lens sheet and a black stripe, a horizontal wrench having a horizontal lenticular lens sheet and a black stripe, and a Fresnel having a Fresnel lens sheet are sequentially arranged.
The vertical wrench and the Fresnel each use glass as a substrate,
The horizontal wrench is a transmission screen characterized in that an anti-glare treatment is applied to the surface on the observer side. The transmissive screen according to claim 1,
The transmission screen according to claim 1, wherein the anti-glare surface has a surface roughness in a range of 2 to 7 μm. The transmissive screen according to claim 1,
The transmission type screen, wherein the vertical wrench is provided with a diffusion sheet closer to the observer side than the vertical lenticular lens sheet. The transmissive screen according to claim 3,
The transmission screen according to claim 1, wherein the diffusion sheet of the vertical wrench has a diffusion layer formed on the surface of the base sheet on the observer side. The transmissive screen according to claim 1,
The vertical screen wrench is provided with either an anti-glare sheet or an anti-reflection sheet on the surface on the observer side. The transmissive screen according to claim 1,
The transmissive screen is characterized in that the Fresnel is provided with an anti-glare sheet on the surface opposite to the observer side. The transmissive screen according to claim 6,
The transmission type screen, wherein the anti-glare sheet has a surface roughness in the range of 2 to 7 μm. The transmissive screen according to claim 1,
The horizontal wrench uses a resin smaller in size than the vertical wrench substrate and the Fresnel substrate, and is fixedly attached to either the vertical wrench or the Fresnel. Transmission type screen. The transmissive screen according to claim 1,
A transmission type screen, wherein a spacer is provided between the horizontal wrench and the Fresnel. The transmission screen according to claim 9,
The transmission type screen, wherein the spacer is provided with a gap. In a rear projection display device including an image light source that emits image light, and a transmissive screen on which the image light is projected from the back,
The transmission screen is
Viewed from the observer side, a vertical wrench having a vertical lenticular lens sheet and a black stripe, a horizontal wrench having a horizontal lenticular lens sheet and a black stripe, and a Fresnel having a Fresnel lens sheet are sequentially arranged.
The vertical wrench and the Fresnel each use glass as a substrate,
The rear projection display device, wherein the horizontal wrench has an anti-glare treatment on the surface on the observer side.

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