TW200408901A - Transmissive screen and projective display device - Google Patents

Abstract

The present invention provides a transmissive screen, which includes a Fresnel-shaped refractive total-reflective plate having a saw-tooth injection face for emitting in projective light and an ejection face for emitting out projective light; and an imaging display plate for imaging the light emitted from the refractive total-reflective plate to obtain a projective image. The projective light is refracted by the refractive total-reflective plate and then plural refractive slopes advancing to the ejection face, plural transmissive slopes transmitted by the projective light, and light transmitting the transmissive slopes are reflected so that total-reflective slopes proceeding to the ejection face are formed on a concentric circle. The refractive total-reflective plate is formed by non-separated transparent material of diffusing particles.

Description

200408901 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a transmissive screen and a projection display device using the transmissive screen. [Prior technology] Developed a penetrating screen, using a Freylen lens forming a concentric circular ring as a convex lens, and imaging the light beam emitted from the Freylen lens on an imaging display board to obtain an image. For example, International Patent Publication No. W002 / 27399 describes a transmissive screen including a refracting total reflection plate (a 'no lens') having a portion that refracts projected light and a total reflection portion, and an imaging display plate. The light emitted from the self-refracting total reflection plate is imaged to obtain a projected image. One of the refracting total reflection plates disclosed in International Patent Publication No. WOO2 / 273 99 forms a plurality of inclined surfaces on the side on which the light is projected. In the part that refracts the projected light, the refracted inclined surface refracts the projected light and advances to the imaging display panel. In the part that totally reflects the projected light, the projected light enters the interior of the Fresnel lens after transmitting through the transmission bevel, and after reflecting on the total reflection bevel adjacent to the transmission bevel, it advances to the imaging display panel. The total reflection bevel reflects the light traveling inside the Freyn lens to the inside of the Frenn lens. Scattering particles exhibiting weak scattering characteristics are dispersed in a Fresnel lens, and the viewing angle for displaying image light is mainly determined by the combination of the scattering characteristics and the scattering characteristics possessed by the imaging display panel. Also, in " Shikama, S. et al., 〇ptical System 〇f Uitra-Thin Rear Projector Equipped with Refractive

200408901 V. Description of the invention (2)-Reflective Projection Optics, SI D20 0 2 Digest, 46.2, (2 0 0 2) n, a projection display device using such a penetrating screen is disclosed. The content of these documents mentioned here constitutes a part of the disclosure of this patent application. However, in the transmissive screen using the above-mentioned refracting total reflection plate, according to the inventor's experiments and ray tracing simulations, both parties found that in addition to the effective light beams that help the formal projection image display, they also saw obstructing light. High-quality image display requires improvement of these phenomena. For example, in the part that totally reflects the projected light, most of the projected light should enter the Freiner lens after transmitting through the transmission bevel, but a part of the projected light after reflecting through the transmission bevel becomes the downward ghost light through an unexpected path. , Be seen by the observer. In addition, in the part that refracts the projected light, the refracting inclined surface refracts the projected light and advances to the imaging display panel, but the light also enters the ineffective facet adjacent to the refracting inclined surface, and then turns up through an unexpected path. Or ghosting light, seen by the observer. [Summary of the Invention] The present invention is to solve the above-mentioned problem, and the object thereof is to provide a total reflection plate penetrating type screen and use the penetrating type silver twilight to reduce the obstruction of light and should be high quality: i: projection type of screen The display is equipped with a reflective total reflection plate penetrating screen of the present invention, and a mirror-shaped refractive total reflection plate having an exit surface through which the projection light enters and the projection light exits; and an imaging display panel: 2 5 surface projection The light emitted by the plate is imaged to obtain a projected shadow; at this refraction: reflection: =

V. Description of the invention (3) The incident surface refracts the projected light and makes it transmit to the 誃 ^ plane, and the projected light transmits the complex transmission = the out-of-plane reflection of the complex refracted oblique light and then moves forward to the exit surface and transmits the transmitted oblique surface. Above; the refractive total reflection plate has a surface shape. Therefore, it is formed by a transparent material in which scattering particles are not dispersed. The plate is totally reflective for refraction;: shape;: total reflection for reflection The reflected light occurs, which can reduce the intensity of obstructing light. The " anti-diffusion 4 imf type display device includes: a projection optical system that emits a projected light beam with a month ^; the aforementioned transmissive screen of the present invention; and a flat mirror, which reflects from the projection to the transmissive screen The projection beam of the optical system is disposed between and below the transmissive screen and the plane mirror. Therefore, the effect of obstructing light can be reduced by the multiplication effect with the penetrating screen of the present invention. In addition, the projection type display device can be made thin. [Embodiment] Hereinafter, in order to explain the present invention in more detail, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. Embodiment 1 FIG. 1 is a schematic diagram showing a projection type display device including a transmissive screen 100 according to Embodiment 1 of the present invention. As shown in FIG. 1, the projection type display device includes a transmissive screen 100, a plane mirror 2, and a projection optical system 4. FIG. 2 is a perspective view of the transmissive screen of the present invention as viewed from the back, and the illustration of the plane mirror 2 and the projection optical system 4 is omitted in FIG. 2. FIG. 1 shows a longitudinal section including a longitudinal centerline A-A passing through the longitudinal direction of the transmission screen 100 shown in FIG. 2.

`` 21Q3-5342-PF (Nl); Ahddub.ptd p. 9 200408901

The & two-plate-shaped plane mirror 2 of the plane 0 and the substantially flat-shaped penetrating screen 1 〇 〇 vertical plane? ^ The configuration is parallel. The projection optical system 4 is located at a position between a plane = A / transmembrane screen 100 in a plan view and is arranged below. Investment system 4P: ί 4 has a refractive optical system 4R with a light source and a convex mirror that reflects the beam of self-refracting optics ^ ^. Reflected by the surface of the convex mirror 4M = It is diffused with the forward movement due to the curvature of the 4M of the f-face mirror, so as to advance toward the flat mirror 2 22. The reflecting surface of the plane mirror 2 faces the transmissive screen 100, and the light emitted from the optical system 4 is reflected obliquely upward toward the transmissive screen 100. Right = The projected light beam advancing toward the tooth-type screen 1 00 is classified into the projected light that penetrates the upper part of the penetrating screen 100 and the projected light that enters the central part, and the projected light that enters the lower part 5 U. As shown in FIG. 1, by arranging the projection optical system 4 between and below the flat mirror 2 and the transmissive screen 100, the thickness of the projection display device (rear projector) can be reduced. As shown in Fig. 2, the "telescope type screen 1" includes a rectangular refracting total reflection plate 1. The refracting king reflective plate 1 has a rectangular imaging display panel of approximately the same size. 3 ° refracting total reflection plate 1 is a Frey lens. Shape, a concentric multiple ring body is formed on the side incident on the light advancing from the plane mirror 2 (mineral tooth shape in the cross-sectional view of FIG. 1), and the reverse side is a flat shape. A common central axis B (see FIG. 1) of the zigzag ring body formed on the refracting total reflection plate 1 is arranged near the lower side of the refracting total reflection plate 1. The refractive total reflection plate 1 having such a sawtooth-shaped incident surface may be formed of a transparent material such as glass or acrylic as a whole. However, in view of the difficulty in forming the sawtooth structure, it is suitable to use the single-sided surface of the flat first transparent substrate

? li) 3-5342-PF (Nl); Ahddub.ptd page 10 200408901 V. Description of the invention (5) Different materials from the first transparent substrate 18 to form a sawtooth structure (refractive full reflection structure) 19.

If this is done, mass production is easy. For example, in the case where the first transparent substrate 18 is formed with a knives, a sawtooth structure 9 may be formed on one side of the first transparent substrate 8 with an ultraviolet (UV) hardening resin or other resin. The refractive indices of the first transparent substrate 18 and the hybrid structure 9 are preferably as close as possible. If the transparent substrate 18 is formed by acrylic, the acquisition or manufacture of the transparent substrate 18 can be easily and inexpensively made, and the first transparent substrate 8 can be made lighter. If the first transparent substrate 18 is formed of glass, the transparent substrate 18 can be easily obtained and manufactured, and the first transparent substrate 18 having excellent planarity can be formed. As shown in FIG. 1, the total reflection plate 1 is refracted to reduce the reflection coating layer 1 for reducing the reflectance of the incident visible light. 6 The coating is incident on the surface from the plane mirror 2 ί 2 ί w $. The anti-reflection coating layer 16 is a single layer composed of a single layer :: Yes, and a double layer composed of two layers is also acceptable. The refractive index of the material of the refracting total reflection plate 1 applied in a single layer is MgF, but the material of the yak low-reflective coating layer 16 is optional. The material of the coating layer 16 is not limited to this. Say 'the case of the main wipe, reduce the reflection coating

Specific refraction, total reflection 1 * from + 丨 ~ soil layer 16 has a refractive index 折射率 = ::; rate; = material of total reflection plate 1

MgF or Α12〇3 can be selected on the material of the first layer, but can be called on the material of the first layer, but the first layer and

4 200408901 4

That is, the surface of the refracting total reflection plate 1 that emits light is provided with a first lenticular lens portion 15 composed of an array of a plurality of cylindrical lenses. Each of the cylindrical lenses constituting the first lenticular lens portion 15 has a shape in which a cylindrical or elliptical cylinder is cut in a plane parallel to the basin axis, and the shapes and sizes of the cylindrical lenses or the elliptical cylinders are preferably the same. Each cylindrical lens is in a state where the plane and the refracting total reflection plate are in contact with each other, and the horizontal direction is extended to (in the vertical direction of the paper surface of Fig. 1). Since these cylindrical lenses are arranged periodically in the up-and-down direction, the light exit surface to the right of the first lenticular lens section 5 fluctuates periodically in the up-and-down direction. Therefore, the light emitted from the self-refracting total reflection plate is diffused in the vertical direction by the respective cylindrical lenses. The material of the second layer is not limited to these.

The first lenticular lens portion 15 is formed using a transparent material. In view of the difficulty of forming, it is suitable to form the first lenticular lens portion 5 on a single surface of the flat-shaped first transparent substrate 8 which is different from the first transparent substrate 1j. If this is done, mass production is easy. For example, in the case where the first transparent substrate 18 is formed by acrylic ', the first lenticular lens portion 15 may be formed on one side of the first transparent substrate 18 with a hardening resin or other resin. The refractive indices of the first transparent substrate 18 and the first lenticular lens portion 15 are preferably as close as possible.

The light-emitting surface of the first lenticular lens portion 15 is covered with a coating layer j 7 for reducing reflection. The reduced reflection coating layer 7 reduces the reflectance of visible light that enters the first lenticular lens portion 15 from the right side of FIG. 1, that is, the outer side of the refracting total reflection plate 1. The low-reflection paint layer 17 may be a single-layer paint composed of a single layer, or a double-layer paint composed of two layers. In the case of single-layer coating, it is better to form the reflection-reducing coating layer 17 with a material having a refractive index lower than that of the material of the first lenticular lens portion 15.纟 In case of double-layer coating, reduce the reflection coating layer 17

200408901 V. Description of the invention (7) The first layer and the first layer formed by covering the first lenticular lens portion 15 with a material having a higher refractive index than that of the material of the first lenticular lens portion 15 The second layer is preferably formed of a material having a lower refractive index than that of the material of the first lenticular lens portion 15. Further, in another embodiment of the present invention, the first lenticular lens portion 15 is not provided, and the reflection-reducing coating layer 17 may be directly provided on the plane that refracts the light emitted from the total reflection plate 1. However, as described later, in order to reduce ghost light, it is preferable to provide the first lenticular lens section 5 as in the first embodiment. The second double-cylindrical lens composed of a flat plate-shaped second transparent substrate 32 and a second transparent lens 32 has a broken shape, and the other side and the second are transparent due to the right of these cylindrical lens portions 31, therefore, the horizontal direction from the second Expanded light distribution characteristics. OK match. The planes of the first array extend in their planes. Two humps. Shape lens image light exit plane flat mirror portion 31 Shape lens mirror portion 31 Parallel downward shaped lens rows, the first periodic cylindrical display panel 3 has a second transparent substrate 32 and a second biconvex which refracts the total reflection plate 1 The transparent light incident surface is provided with a plurality of cylindrical convex lens portions 31. To form the second biconvex, it is better to have a cylindrical or elliptical cylinder with the same size as its axis. In a state where the cylindrical substrates 32 are in contact with each other, the light is emitted from the lenticular lens portion 31 in the horizontal direction, and the light emission surfaces of the lenses are periodically arranged along the horizontal direction. That is, the second lenticular lens portion 31 may be formed integrally with a transparent material such as the second transparent substrate 32 and the second lenticular. Difficulty, it is suitable to form the saw-convex lens portion 31 on a flat plate-shaped second transparent substrate 32 with a different material. The glass substrate or acrylic is used to shape the single surface of the transparent substrate 32 and the second tooth structure. It ’s easy to grow like this

200408901 V. Description of Invention (8) 畺 Production. For example, when the second transparent substrate U having a flat plate shape is formed with acrylic, the second lenticular lens portion 31 may be formed on one side of the second transparent substrate 32 with a UV-curable resin or other resin. The refractive indices of the second transparent substrate 32 and the second lenticular lens portion 31 are preferably as close as possible. Inside or near the surface of the transparent substrate 32, particles of radiating particles made of a well-known material are dispersed. Due to the scattering particles, the second transparent substrate 32 functions as a radiation plate to image the projected image. Next, the shape of the refractive total reflection plate in this embodiment will be described more specifically. The lower part of the refracting total reflection plate 1 (close to the inner part of the common middle axis ^ axis B of the zigzag ring body) is constituted by the refracting area 丨 L, the central part is composed of the refracting and total reflecting area 1M, and the upper part (away from the common central axis β side) Partly) consists of a total reflection area ιυ. The zigzag structure is continuously formed between these areas, 1M, 11}, but in the figure, for ease of understanding, parts 1L, 1M, 1U are omitted / omitted. In the refracting optics of the projection optics 4, "the projected light beam emitted is reflected by the convex mirror 4M, and is reflected by the plane mirror 2 to enter the projected light 51 into the refracting region 1L in the lower part of the refracting total reflection plate 1, and the refracting and total reflection The projection light in the area 1M ... and the total projection light 5U are incident on the transmissive screen 100. The refraction area of the inner part of the total reflection plate 1 of $ 11] has a complex refractive slope 11 and a phase with the refractive slope 11 Adjacent complex invalid facets 12. Refraction slope 11 and invalid facets 12 are alternately arranged at a period P. Refraction slope u and invalid J face 1 2 constitute a zigzag ring formed by refracting total reflection plate 1. Refraction slope 11 It has a bevel-shaped profile that is inclined with respect to the common central axis B of the ring body and converges on the injection side, while the ineffective facets 1 2 have parallel and

fW3-5342-PF (Nl); Ahddub.ptd Page 14 200408901 V. Description of the invention (9) Cylindrical outline. The projection light 5L emitted from the projection optical system 4 is refracted at a refraction angle of φ 1 1: a common method for refraction along the normal line n (which constitutes a transmissive screen 丨 〇〇 1 ^ \ imaging display panel 3 (Line) direction within the refracting total reflection plate 1 " 卩 & Therefore, the 'refraction slope 11' can refract the light from the outside and can be introduced into the inside of the refracting total reflection plate 1. The total reflection area 丨 υ of the outer side of the total refractive reflection plate 1 has a complex number of $ reflection bevels 1 3 and a plurality of transmission bevels 丨 4 adjacent to the total reflection bevel 丨 3. The king reflection bevels 13 and the transmission bevels 4 are alternately arranged at the same period p as described above. The total reflection inclined surface 13 and the transmission inclined surface 4 constitute a zigzag ring body formed on the refractive total reflection plate 1. With respect to the common central axis B of the ring body, the total reflection bevel 13 has a chamfer shape of a circular cone that is inclined and converges on the entrance side, and the transmission bevel 14 has a circular truncated cone that is inclined and converges on the exit side. Bevel-shaped outline. The projected light 5U incident from the projection optical system 4 and incident on the transmission bevel 丨 4 is refracted by the transmission bevel 14 and is reflected by the total reflection bevel 13 so that it advances inside the refracting total reflection plate 丨 along the direction of the normal line η. Therefore, the transmissive inclined surface 14 refracts the light from the outside and can be introduced into the interior of the refracting total reflection plate. The total reflective slope 13 can reflect the light from the interior of the refracting total reflection plate 1 toward the interior of the refracting total reflection plate 1. . The refraction and total reflection area 1M has a complex refracting slope, a complex invalid facet 12, a complex transmission slope 14, and a complex total reflection slope 13. A refraction slope 11, an invalid facet 1, 2, a transmission slope 丨 4, and a total reflection slope 丨 3 constitute a group of composite structures. In each composite structure, a transmission bevel 14 is formed adjacent to the inner side of the total reflection bevel 3, and a refraction bevel 11 is formed adjacent to the inner side of the transmission bevel 14, and a refraction bevel 1 is immediately adjacent to the inner side.

200408901 V. Description of Invention (ίο) Invalid facet 1 2 On the inner side of the ineffective facet 丨 2, a total reflection bevel 13 of another group of composite structures is formed. In this manner, the composite structure of the arrangement in which the refraction and total reflection area j M is connected at the same period P as described above is arranged. 1. After the projection optical system 4 is emitted, it enters the refracting and total reflection area by 1M, and the projected light 5M of the projection slope 11 is refracted by the refracting slope n, and then advances along the normal line ^ in the refracting total reflection plate. In addition, after projecting from the projection optical system 4, the projected light 5 μ entering the transmission slope 14 is refracted by the transmission slope 1-4, and advances inside the refracting total reflection plate along the direction of the normal line η. The refraction slope η and the ineffective facet 12 in the refracting and total reflection area 1M have the same shape and function as the refraction slope 11 and the ineffective facet 12 in the refraction area 11. The total reflection slope 1 and the transmission slope 14 in the refracting and total reflection area 1M have the same shape and function as the total reflection slope 3 and the transmission slope 1 in the total reflection area 1 U. In the refraction and total reflection area, M, in the lower or inner part, the ratio of the refraction slope 11 and the ineffective facet 12 is larger than that of the total reflection slope 13 and the transmission slope 14, and in the upper or outer portion, the total reflection slope 丨 3 and The ratio of the transmission inclined surface 1 4 is larger than the ratio of the refractive inclined surface 丨 丨 and the ineffective small surface 丨 2. That is, the lower or inner portion of the refracting and total reflection region 1M has a shape similar to that of the refracting region ^, and the upper or outer portion of the refracting and total reflection region 1M has a shape similar to the total reflection region 1U. In the volume of the refracting total reflection plate 1, particles causing scattering are not dispersed or are eliminated as much as possible. Therefore, the projected light 5L, 5M, 511 introduced into the inside of the refracting total reflection plate 1 (including the first transparent substrate 18) advances along the normal line 0 inside the total reflection plate 1. The light emitted from the refracting total reflection plate 1 has the first lenticular lens portion 15.-2 * 1 Q3-5 342-PF (N1); Ahddub. Ptd page 16 20040901 V. Description of the invention (li) ~ The first lenticular lens portion 15 diffuses in the vertical direction. In addition, the emitted light diffuses horizontally in the second lenticular lens portion 31 and is diffused by the scattering particles of the second transparent substrate 32, and the observer 9 sees the image light 8 as being displayed. The person-a knows the effect of the penetrating screen of Embodiment 1 of the present invention thus constituted. ~ In the comparative example, the transmission type screen 100 shown in Figs. 3 to 5 will be described. As shown in these figures, in the transmissive screen 100 of the comparative example, the reflection-reducing coating layer 6 shown in FIG. 1, the first lenticular lens portion 15, and the reflection-reducing coating are not provided on the refractive total reflection plate 1. Layer 1 7. Further, scattering particles exhibiting weak scattering characteristics in the volume of the refracting total reflection plate 1 are dispersed, and the viewing angle of the display image light 8 in the up-down direction is mainly determined by a combination of the scattering characteristics and the scattering characteristics of the transparent substrate 3 2. Referring to Fig. 4, a description will be given of a mechanism for generating a ghost light in a direction below the comparative example. Most of the projected light 5M of the refraction and total reflection area 1M in the center of the transmissive screen 100 among the light beams reflected by the plane mirror 2 after being emitted from the projection optics 4 is as described above, because it is refracted on the refractive slope 1 1 Or it is refracted on the transmission slope 1-4 and reflected on the total reflection slope 13, and after entering the imaging display panel 3 with the formal projection light 5MP parallel to the normal η, it becomes the projection image light 8 with appropriate light distribution characteristics. However, part of the light beam scattered by the scattering particles in the volume of the refracting total reflection plate 1 is reflected by the exit-side plane 1 R of the refracting total reflection plate 1. These reflected light beams travel as diagonally reflected light 5 MD and slightly obliquely upward, and then transmit through the surface of the incident side of the refracting total reflection plate 1 and are reflected by the plane mirror 2 and enter the refractive region of the lower or inner portion of the refracting total reflection plate 1 1 L, after the transmission refraction slope 11, it is reflected by the ineffective facet 1 2 and becomes a more formal image

-: ¾; Q3-5 342-PF (N1); Ahddub. P t d p. 17 200408901 V. Description of the invention (12) Ghost light 5MDS below the position of the lower part of light 8. As shown in FIG. 4, among the projected light 5M that has entered the refraction and total reflection area 1M, the light 5MR reflected by the transmission slope 14 is incident on the refraction total reflection plate 1 and is reflected by the exit-side plane 1 R. The reflection plate i exits, is reflected by the plane mirror 2 and enters the refracting total reflection plate 丨 the refraction area 1 L at the lower or inner part, the transmission refraction slope 丨 丨, is reflected by the ineffective facet 丨 2 and becomes lower than the official image light 8 Under the position of the direction Ghost Light 5MRS. The down direction ghost light 5MDS and 5MRS appear on the transmissive screen 100 in a direction more than the normal image light 8 and become obstructive light when viewing and displaying images. As shown in Figure 2, due to the zigzag structure of the incident surface of the refracting total reflection plate, the same: the axis B is located near the lower edge of the refracting total reflection plate. It is experimentally known that The position of the square light near the screen tends to increase in intensity. % Next, the structure of the comparative example will be described with reference to Fig. 5. Self-projection optics 4 shots 屮 尨 正品 genuine ^ 穿透 Transmission screen 10. Bottom two: the reflected light beam is projected into the heart's refracted area 1L, and the projected light 5LP is projected into imaging two = ': a formal projected image light 8 parallel to the normal n. ^ Cheng has the appropriate light distribution feature

But 'because of the projected light ^ I the total reflection plate 1 shot 4W east 5L shot ineffective facet 12 the light beam is reflected by the refracting king reflection plate 1 on the exit side plane 1R and separated into imaging soil c. Thousands of sawing shots are reflected by the plane mirror 2 and the second shot is heavy: 5LMD first and 5LMS after shooting backward. Ghost light in the direction above the upper part of the display and imaging, and ghost light 5LMD appearing in the upper part of light 8 and appear in

-f ^ 〇3-5342-PF (Nl); Ahddub.ptd Page 18 200408901 V. Description of the invention Presentation of the official display image Ghost light 5LMS is more obstructive light than that of the image when it is above the gravity image light. Next, a mechanism for reducing the intensity of ghost light and ghost light by using the penetrating screen of the first embodiment of the present invention will be described. One (1) down direction ghost light reduction mechanism is in a comparative example, as shown in FIG. 4, i) the refracted total reflection plate 1 containing scattering particles, the reflected light from the exit plane 1R of the refracted total reflection plate 1, and the aspect ratio method Line η diffuses the reflected light 5MD slightly upwards, and ii) both of the light 5MR reflected by the transmission slope 丨 4 become the origin, and the downward ghost light occurs. Moreover, in the first embodiment of the drawing, because the refracting total reflection plate 1 uses a material that does not contain scattering particles ", and the exit surface of the refracting total reflection plate 1 is provided with a reduced reflection coating layer 1 that reduces the reflectance of visible light. 7 'can reduce the reflection from the exit surface of the refracting total reflection plate 1, and at the same time can suppress the diffusivity of the reflected light, which can significantly reduce the light 5MD of i). At the same time, since the first lenticular lens portions 15 arranged in the up-down direction are arranged on the exit surface side of the refracting total reflection plate 1, the refracting total reflection can be compared with the refracting total reflection plate 1 of the comparative example of the simple concentric circle structure. The structure of the optical element of the plate 1 is set to be non-rotationally symmetric with respect to the common central axis B of the concentric circles. As a result, it is possible to reduce the density of light rays that enter the refraction area at the lower end or inner part of the penetrating screen 100 and enter the refraction area of the bottom surface of the transmissive screen 100, which is reflected by the surface of the refracting total reflection plate 1 (that is, the beam Diffusion) can also reduce the problem of the intensity of ghost light getting closer to the bottom of the screen. Moreover, in Embodiment 1, since the reflection-reducing coating layer 16 for reducing the reflectance of visible light is provided on the incident surface of the refracting total reflection plate 1, it is remarkable

200408901 V. Description of the invention (14) Reduce the intensity of the reflected light 5MR which is the problem of i i). As a result, the intensity of the ghost light in the downward direction (lights 5 MDS, 5 MRS in FIG. 4) can be suppressed to a small level by using the structure of the transmission screen of FIG. (2) In the comparative example, the mechanism for reducing the ghost light in the upward direction is shown in FIG. 5. As the light beam incident on the ineffective facet 12 is reflected by the exit plane 1 r of the refracting total reflection plate 1, The upper teeth are projected toward the rear and reflected by the plane mirror 2 and then incident on the upper part of the imaging display panel 3, and ghost light occurs in the upward direction. In the first embodiment of FIG. 1 ′, a first lenticular lens portion 15 arranged in the up-down direction is provided on the exit surface side of the refracting total reflection plate 1, so that it enters the ineffective facet 12 and is refracted by the refracting total reflection plate 1. The light beam reflected by the exit surface is scattered. Furthermore, the first biconvex lens portion 15 is used to scatter the light beam 5LMS transmitted through the refracting total reflection plate 1 after being reflected by the plane mirror 2. The use of these two-stage scattering can reduce the beam density of the ghost light on the screen in the upward direction and make it inconspicuous. (3) In the comparative example, as shown in FIG. 5, the reduction mechanism of ghost image light is reflected by the incident plane 1 R of the total reflection plate 1 due to the light beam incident on the ineffective facet 2 and then incident on the sawtooth surface above. , Becomes a light beam 5LMD toward the imaging display panel 3, and ghosting light occurs. In the first embodiment of FIG. 1, a first lenticular lens portion 15 arranged in the up-down direction is provided on the exit surface side of the refracting total reflection plate 1 so that it is refracted by the refracting total reflection plate 1 after entering the ineffective facet 12. Unwanted light beams reflected from the exit side. In addition, the first lenticular lens portion 15 is used to cause the reflection on the exit surface side of the refracting total reflection plate 1 to enter the misaligned surface above it, and the unnecessary light beam 5LMD of the transflective total reflection plate 1 is scattered. Using the two-stage scattering effect can make

-2W3- 5342-PF (Nl); Ahddub.ptd 200408901 V. Description of the invention (15) Decrease the density of the ghost light on the screen and make it inconspicuous. Example 1 In order to confirm the above effects, the results of experiments performed by the present inventors will be described. FIG. 6A shows the measurement results of various test pieces # 1 # 4 of the refracting total reflection plate 1. FIG. For the test pieces # 丨 ~ # 4, the first transparent substrate 18 was manufactured in acrylic. Test piece # 1 is the refractive total reflection plate 1 of the comparative example of FIG. 4 in which neither of the antireflection coating layers 16, I? And the first lenticular lens portion 15 are provided. Specimen # 4 is set ^ Lower reflection coating 丨 6 ,! 7 and the first biconvex lens section 丨 5 of the jade embodiment 1 of the refractive total reflection plate 1. In test pieces # 2 and # 3, the anti-reflection coating layers 16, 17 are each composed of a single layer, and in test piece # 4, the anti-reflection coating layers 16 and 17 are each composed of a double layer. That is, the reduced reflection coating layers 丨 6, 丨 7 each have a first layer covered on the refractive total reflection plate 丨 and a second layer covered on the first. FIG. 6B shows the production of each test piece of the refracting total reflection plate; the two cases of Λ1; and 17 are in a single layer, and have a refractive index NL () lower than the refractive index 153 of the first transparent substrate 18 (acrylic). 143). In this case, the first layer of each layer constituting the reduced reflection coating layers 16 and 17 has a higher refractive index nh (167) than the refractive index 53 of the f-transparent substrate 18, and the first layer has a refractive index higher than that of the first transparent substrate 18. The low-refractive index sound with a rate of 153 is adjusted by the first transparent substrate 18 made of flat acrylic, and the L / Λ is covered with ultraviolet (uv) hardened resin to form the ore tooth structure 1. Invalid facets 12, The total reflection slope 13 and the transmission: Λ to each test piece for this experiment, the refractive index of the hardened resin is close to 155 of the refractive index of the μgram plate. Constituent No.-Double Convex 200408901 V. Description of the Invention (16) Each cylindrical lens of the mirror portion 15 has a shape in which an elliptic cylinder is cut by a plane parallel to its axis. For the test pieces # 丨 ~ # 4 prepared in this way, the brightness of the white window, the brightness of the ghost light in the downward direction, the brightness of the ghost light in the upward direction, and the degree of obstruction of the ghost light were measured. Fig. 6C shows specific measurement conditions. The transmissive screen 丨 〇〇 is a rectangle with a diagonal distance of about 60 inches (about 15 24 mm) and an aspect ratio of 4: 3. That is, the distance of the transmission screen 100 is about 914 minutes in the height direction and the distance in the width direction is about 1219 mm. The projection optical system 4 is controlled, and a square (24 cm side) white is displayed in the center of the transmission screen 100. window. Then, the measurement is based on the brightness of the white window of the formal projected light and the brightness of the ghost light in the downward direction. In this measurement, as shown in FIG. 6C, a measurement (frontal observation) in which a luminance meter is disposed in a normal direction of the screen and a measurement in which a luminance meter is disposed 20 degrees above the normal direction of the screen ( Snooping). In FIG. 6A, the ratio of the brightness of the white window and the brightness of the ghost light in the downward direction is shown. The larger the ratio is, the smaller the relative brightness of the ghost light is, which indicates a desired characteristic. The measurement of ghost light in the upward direction is controlled by the projection optical system 4 and a square (a white window with a side length) is displayed in the center of the lower end of the transmissive screen 100. Then, the projected light according to the conditions shown in FIG. 6C was measured. The brightness of the white window and the brightness of the ghost light in the upward direction. The ratio of the brightness of the white window to the brightness of the ghost light in the upper direction is entered in FIG. 6A. The larger the ratio is, the smaller the relative brightness of the ghost light is, indicating a desirable characteristic. In the measurement of ghosting light, the projection optical system 4 is controlled, as shown in FIG. 6C, and a cross-over image is displayed on the transmissive screen 100 (as shown in FIG. 8A, etc.)

21-03-5342-PF (Nl); Ahddub.ptd Page 22 200408901 V. Description of the invention (17) Image of multiple lines), using the observer's vision to evaluate ghosting light. In Fig. 6A, the symbol X indicates that the formal image is impeded by the ghost light to an unacceptable level, and the display image is bad; the symbol 0 indicates that it is permissible, that is, the display image is good. The following matters are known from FIG. 6A. (1) From the comparison between test piece # 1 and test piece # 2, it is learned that by processing a single layer of the reduced reflection coating layers 16, 17 on both the incident surface and the exit surface of the refracting total reflection plate 1, ghost light is directed downward. The brightness is greatly reduced (about 1/3). This is because the intensity of the reflected light on the flank surface of the refracting total reflection plate 1 is reduced, and the intensity of the reflected light on the exit surface is reduced, which is the reason why the reflected light intensity is reduced due to the ghost light in the downward direction. (2) Comparing self-test piece # 2 and test piece # 3, it is learned that by reducing the reflection-reflective coating layers 16 and 17 on both sides of the refracting total reflection plate 1, each of them is double-layered from a single layer, and the downward direction is ghosted. The brightness of light is greatly reduced (about 1/2). This is because the double-layer coating has a higher reflectance reduction effect than the single-layer coating, and the reflected light intensity of the misaligned surface and the exit surface on the incident side is further reduced. (3) From the comparison between test piece # 3 and test piece # 4, it is learned that by setting the exit side plane of the refractive total reflection plate 1 as a lenticular lens structure, the brightness of the ghost light in the upward direction can be relatively reduced by about 25%. , And can improve the obstruction of ghosting light to a visually acceptable level. Moreover, in addition to the results shown in FIG. 6A, visual observations have also confirmed that the problem of concentration of ghost light toward the lower end of the screen can be improved in particular. FIG. 7A and FIG. 7B are the comparison photos of the above-mentioned test piece # 1 and the direction below the burner. FIG. 7A shows a square-shaped white window (24 cm in length) displayed in the center of the screen 100 from the direction of the normal line through the teeth.

200408901 Fifth, the description of the invention (18), Figure 7B, the picture taken from the oblique upward direction. Figures μ and 7B indicate that there is no smear on the left half (# 1), and the reflection on the right and lower sides of the smeared coating layers 16 and 17 is 7 u ^. θ 又 # Shuangyue wipe layer, the brightness of the ghost light in the lower direction is obvious; = (: 3.). It is learned that the finishing process is shown in FIG. 8A, FIG. 8B, and FIG. 8C, respectively, and # 1, # 3, and # 4 are ghost images near the lower end of the screen; From FIG. 8A, FIG. 8B, and FIG. 8C, it is learned that by providing the first lenticular lens portion 15 on the surface of the refracting total reflection plate, the reflection-reducing coating layer will be reduced in the case of no coating (# 1) and the two surfaces provided with double layers In the case of 16 and 7 (# 3), the ghosting light seen is reduced to an unrecognizable level, and the quality of the day is improved. In addition, in FIG. 6A, the experimental data of the case where a single-layer or double-layer reduced reflection coating layer is processed only on both sides of the refracting total reflection plate is described. When the reflection coating layer is processed only on the exit surface, although the effect is worse than double-sided coating, it has been confirmed that it has the effect of reducing ghost light in the downward direction. Therefore, in the case of lowering the target or restricting looseness in the downward direction, it is acceptable to form a coating layer (single layer or double layer) only on the incident surface or the outgoing surface of the refracting total reflection plate 1. In addition, in the projection optical system 4 of this embodiment, a convex mirror 4M is arranged at the last stage of the optical system, but it is not necessarily limited to this, and the projection beam is emitted obliquely upward or downward (denoted by symbols 5 L, 5 M, 5 U). It can also be used in combination with the penetrating screen 100 of this embodiment. Therefore, it is within the scope of the present invention to include a projection optical system including a refractive lens, a projection optical system composed of a concave-convex mirror, or a composite projection optical system composed of a refractive lens and a reflective mirror.

r2H) 3-5342-PF (Nl); Ahddub.ptd Page 24 20040901 V. Description of the invention (19) As shown above, according to this embodiment, a refracting total reflection plate is formed by a transparent material in which scattering particles are not dispersed. For the light beam reflected on the exit surface of the refracting total reflection plate 1, it is possible to prevent the diffuse reflection light from occurring, and to reduce the intensity of the ghost light in the downward direction. If the refracting total reflection plate 1 is used, it includes a substantially flat first transparent substrate 18 and a sawtooth structure (refractive total reflection structure) 19 ′ provided on the first transparent substrate 丨 8, and refracting is formed on the sawtooth structure 19. The inclined surface ^, the transmission inclined surface 14 and the total reflection inclined surface 13 may each be formed of a first transparent substrate 18 and a zigzag structure 9 with an appropriate material. If this matter is used, the productivity of the refracting total reflection plate 1 is improved, or the strength of the transparent substrate 18 to an impact from the outside is increased. Also, the refracting bevel of the refracting total reflection plate 1 丨 丨 refracts the projected light toward the normal direction of the transmissive screen 100, the total reflecting bevel 丨 3 redirects the projecting light of the transmissive transmitting bevel 1 4 to the transmissive screen 丨〇〇。 Approximately normal direction reflection. Therefore, it is possible to realize a transmissive screen having a viewing angle characteristic centered on the normal direction of the transmissive screen. Further, a first lenticular lens portion 15 is provided on the exit surface of the refractive total reflection plate, and a plurality of cylindrical lenses extending in the horizontal direction are arranged in the first lenticular lens portion 15 along the up-down direction. Therefore, the rotation symmetry of the light beam reflected on the surface of the refracting total reflection plate is lost, and it is possible to suppress the downward direction ghost light from being concentrated near the lower end or the inner part of the tooth-permeable screen 100. In addition, by using the second lenticular lens portion 15, unnecessary light beams on the exit surface of the refracting total reflection plate 1 are diffused, so that the ghost light and the ghost light in the upward direction can be made inconspicuous. In addition, the imaging display panel 3 includes light emitted from the self-refracting total reflection plate 1

Page 25 200408901 V. Description of the invention (20) The second lenticular lens portion 31 diffused in the horizontal direction and the second transparent substrate 32 that receives light emitted from the second lenticular lens portion 31 are along the second lenticular lens portion 31. The plurality of cylindrical lenses arranged in the horizontal direction and extending in the vertical direction are dispersed on the second transparent substrate 32 to scatter the scattered particles that are imaged by the projected light. Therefore, a transmissive screen 100 including an imaging function of a projected image and an appropriate horizontal viewing angle characteristic can be realized. If a reflection-reducing coating layer 16 for reducing the reflection of visible light is formed on the incident surface of the refracting total reflection plate 1, a refracting total reflection structure provided on the incident surface side of the refracting total reflection plate 1, especially the reflection change of the transmission inclined surface 4 Small, can reduce the intensity of the ghost light in the downward direction. On the other hand, if a reduced reflection coating layer 17 is formed on the exit surface of the total reflection plate to reduce the reflection of visible light, the reflection on the exit surface of the refracted total reflection plate 1 becomes smaller, which can reduce the intensity of the ghost light in the lower direction. = The anti-reflective coating layer 16:17 is provided on the incident surface and the exit surface of the refracting total reflection plate 1, and the effect of both sides can further reduce the intensity of the ghost light in the downward direction. cup! The / Jt low-reflection coating layer 16 or 17 is a single-layer coating made of a material having a lower refractive index than refracting total reflection ϊΛ8Λ, a low-refractive index coating, which can reduce the intensity of ghost light at a cheap price. However, Ruojiang or 17 has the first layer of the material coated on the refracting total reflection plate 1 and * refracting leather than the refracting total reflection plate 丨 and the material coated on the first layer and refracted by the refractive index. The material formed by 枓 has a low refractive index, and the intensity of the long light is reduced in the direction of the second reflection king 1 formed by the material: the twin-layer double object can make the next 糸 4 to be arranged on the transmissive screen 100 and the plane mirror Between 2 and below, page 26 0 ^ 3-5342-PF (Nl); Ahddub.ptd 200408901 V. Description of the invention (21) The multiplication effect of using and penetrating the screen 1 0 0 can reduce the ghost light in the downward direction, The effect of upward ghost light and ghost light. Further, since the projection optical system 4 is disposed between and below the transmission type screen 100 and the plane mirror 2, a thin projection type display device can be constructed. Embodiment 2 FIG. 9 is a scraped view showing a penetrating screen 100 according to a second embodiment of the present invention. Specifically, the same representation as that shown in FIG. 1 includes the penetrating screen 100 shown in FIG. 2. Vertical centerline A —A longitudinal section. In Fig. 9, the same reference numerals are used to indicate the constituent elements common to those in Fig. 1, and detailed descriptions thereof are omitted. In this embodiment, the refracting area 11 and the refracting and total reflecting area 1M in the vicinity of the common central axis B of the ring body of the refracting total reflection plate 1 form the refracting inclined surface 11, the total reflecting inclined surface 3, and the transmitting inclined surface 4 , So that the projected light advances outward in the direction of the normal line η of the transmission screen 100. Therefore, near the lower edge of the transmissive screen 100, the projected light advances slightly above the normal line η and passes through the total reflection plate 1 and the imaging display plate 3. A total reflection bevel 13 and a transmission bevel 14 are formed in the total reflection area ιυ ′ far from the common central axis B, so that the projected light advances in the direction of the approximate normal line η of the transmissive screen 100. In the refraction region 1L and the refraction and total reflection region 1M, a refraction slope 11, a total reflection slope 13, and a transmission slope 4 are formed, so that the farther away from the common central axis B (away from the lower side), the forward direction of the projected light is relative to the penetration The smaller the angle "the upward projection angle" of the normal direction of the screen 100 is. For example, as shown in FIG. 9 ′, the projected light 5L incident on a refraction region close to the common central axis B, L, is refracted by the refraction slope 11 and then is aligned with the normal of the transmissive screen 丨 〇 〇

200408901 V. Description of the invention (22) The upward shooting angle θ 1 advances (ray 5LU). The projected light 5M entering the refracting and total reflection area 1M far away from the common central axis 6 advances at an exit angle (ray 5MU) with respect to the normal ^ of the transmissive screen 丨 00 using the refracting slope n or the total reflecting slope 13. The shot angle Θ2 is smaller than the shot angle Θ1. The other structures and main features are the same as those of the first embodiment. Fig. 10 shows the relationship between the distance from the ring body of a suitable refracting total reflection plate 丨 and the common central axis B and the upward projection angle θ in the second embodiment. This refracting total reflection plate 1 is a rectangle with a distance of about 60 inches (approximately 15 gubei 4: 3 rectangle. That is, the height of refracting total reflection is 2212 mm, and the distance in the width direction is about 1219 mm. As shown in Fig. 10, at a suitable refracting total reflection plate 1, the upward emission angle slowly changes linearly, so that the closer to the lower end of the screen (equivalent to a radius of 150 mm in this example), the upward emission angle < 9 becomes larger. At a point of 1 M in the refracting and total reflection area (in the vicinity of a radius distance of 45 mm), the upward emission angle 0 becomes 0 degree. According to this embodiment, the light emitted from the lower part of the self-refracting total reflection plate 1 has a large upward emission. The angle of 0 can increase the light intensity of the image perceived by the observer 9 from the lower part of the transmissive screen 100, and as a result, the intensity of the ghost image light is relatively weakened. Moreover, as described with reference to FIG. As shown in the refracting total reflection plate 1, by slowly changing the upward projection angle 0, it is possible to avoid a drastic change in the brightness on the day. The drastic change is projecting upward to the angle of the sun guard, and it is in the picture due to the drastic change of the party degree. Half moon may appear in the lower part The island region 'but that the degree of change by up emission angles prevent such adverse appropriate. As shown in' accordance with the present embodiment 2 when, due to the total reflection refraction

--2-103-5342-PF (Nl); Ahddub.ptd j j i

200408901

V. Description of the invention (23) The area near the common central axis B of the plate 1 forms an inclined surface, so that the projected light advances outside than the normal direction of the penetrating screen 100, and forms in an area far from the common central axis B. The oblique surface advances the projected light toward the normal direction of the penetrating screen, and calls for the relative reduction of the intensity of the ghost light that occurs near the lower end of the daylight surface relative to the intensity of the formal image light. In addition, because the upward emission angle Θ is changed in the area near the common central axis β, the farther away from the common central axis B, the smaller the angle between the forward direction of the projected light and the normal direction of the transmission screen 100, the smaller the displayed image. The brightness change is not obvious, and a transmissive screen can be realized with good brightness uniformity. Embodiment 3 FIG. 11 is a perspective view showing a refractive total reflection plate 1 of a transmission screen according to Embodiment 3 of the present invention as viewed from the exit surface side. The illustration of the imaging display panel 3 is omitted. In Fig. 11, the same symbols are used for the constituent elements common to those in Fig. 1, and detailed descriptions thereof are omitted. In the third embodiment, an array of a plurality of microlenses 15 is provided on the exit surface of the refractive total reflection plate 1, instead of the first lenticular lens portion 15 of the first embodiment. Each microlens 150 is a small convex lens having a function of diffusing the light emitted from the refracting total reflection plate 1 in at least the up-down direction and the left-right direction. The shape of the microlens 150 includes a part of a spherical surface, a part of an elliptical surface, a part of a hyperboloid, a rectangular parallelepiped, and the like. These microlenses 15 are preferably the same shape and size as each other. Adjacent microlenses, as shown in Figure 丨, may be clearly separated, and continuous structures with connected borders may also be used. Tap these microlenses 1 50 periodically in the up-down and left-right directions.

200408901 V. Description of Invention (24) column. The period in the up and down direction of the array without microlens 150 is ρχ, and the period in the horizontal direction is Py. The light emitted from the self-refractive total reflection plate j is diffused in the up-down direction and the left-right direction by each micro lens 15. As with the first lenticular lens portion 15 described above, the microlens 150 is also formed of a transparent material. In view of the difficulty of molding, it is suitable to form the lens 150 on a single surface of the first to the transparent substrate 18 in a flat plate shape with a material different from that of the first transparent substrate 18. If this is done, mass production is easy. For example, in a case where the first transparent substrate 18 is formed with acrylic Λ, the microlens 15 may be formed on the first transparent substrate 18 with a UV curing resin or other resin alone. The refractive indices of the first transparent substrate 18 and the microlens 150 are as close as possible. Also, although not shown, a reflection-reducing coating layer (equivalent to the above-mentioned figure 丨 reduction-reduction coating layer 7) that reduces the reflectance of visible light from the outside is coated with a refractive total reflection plate including an array of micro lenses 150. Shoot out. The anti-reflection coating layer may be a single-layer coating composed of a single layer, or a double-layer coating composed of two layers. In the case of single-layer coating, it is better to form a low-reflection coating layer using a material having a refractive index lower than that of the material of the microlens 150 and the refractive total reflection plate 1. In the case of double-layer coating, the reduced-reflection coating layer has a first coating formed on the microlens 150 and the refracting total reflection plate and formed of a material having a higher refractive index than that of the microlens 150 and the refracting total reflection plate 1. One layer and the second layer formed of a material covering the first layer and having a refractive index lower than that of the microlens 50 and the material of the refracting total reflection plate 1 are preferable. By setting an array of microlenses 15 on the exit surface of the refracting total reflection plate 1, the penetrating screen of this embodiment can reduce the ghost light in the downward direction and the upward direction. • 21-03-5342-PF (Nl); Ahddub .ptd Page 30 200408901

V. Description of the invention (25) Ghost light and ghost light. Next, referring to FIG. 4 and FIG. 5 showing a comparative example, it is shown that the ghost screen is reduced by the transmissive screen according to the third embodiment of the present invention. The microlens 1 50 is provided on the exit surface side of the reflection plate 1 compared with the refractive total reflection plate 1 of the comparative example of the simple concentric circle structure. The structure of the optical elements of the refractive total reflection plate 1 can be made common to the concentric circles. The central axis B is not rotationally symmetric. As a result, it is possible to reduce the density of the light reflected by the surface of the "reflective total reflection plate 1" into the refraction area 1 L at the lower end or the inner part of the penetrating screen 100, which becomes a ghost light in the downward direction (i.e. Beam spreading), which can reduce the problem of the comparative example where the intensity of the ghost light is stronger as it approaches the lower end of the screen. Also, because a material containing no scattering particles is used on the refracting total reflection plate 1, a reflection-reducing coating layer for reducing the reflectance of visible light is provided on the exit surface of the refracting total reflection plate 1, which can reduce the exit surface from the refracting total reflection plate 1. At the same time, the diffusivity of the reflected light can be suppressed, and the intensity of the diffusive reflected light (5MD in FIG. 4) which causes the ghost light in the downward direction can be reduced. In addition, since the reflection-reducing coating layer 16 for reducing the reflectance of visible light is provided on the incident surface of the refractive total reflection plate 1, the intensity of the reflected light 5MR on the incident surface can be significantly reduced. As a result, the intensity of the ghost light in the downward direction (lights 5MDS and 5MRS in FIG. 4) can be suppressed to be small. (2) The mechanism for reducing ghost light in the upper direction is also 'in this embodiment, because a microlens 1 50 is provided on the exit surface side of the refracting total reflection plate 1 so that it is incident on the ineffective facet 2 and then the refracting total reflection plate 1 Of

200408901 V. Description of the invention (26) Scattering of the light beam reflected by the exit side. In addition, an array of microlenses 150 is used to cause the light beam 5LMS of the total reflection plate 1 to be transmitted and refracted after being reflected by the plane mirror 2. The use of these two stages of scattering can reduce the beam density of the ghost light on the screen in the upward direction and make it inconspicuous. (3) Reduction mechanism of ghost light

In addition, in this embodiment, since a micro lens 1 50 is provided on the exit surface side of the refracting total reflection plate 1, the unnecessary light beams reflected on the exit surface side of the refracting total reflection plate i after being incident on the ineffective facet 12 are scattered. . In addition, the first biconvex lens unit 15 is used to cause the unnecessary light beam 5L0 (see Fig. 5) of the refracting total reflection plate i to be scattered after being reflected on the exit surface side of the refracting total reflection plate 1 and then incident on the upper sawtooth surface. The use of these two stages of scattering can reduce the beam density of ghosting light on the screen and make it inconspicuous. In addition, in the third embodiment, the inclined surface of the radiation plate 1 makes the fourth embodiment of the light beam

As described above, according to the third embodiment, the same and similar effects as those of the first embodiment can be obtained. In this embodiment, instead of the array of microlenses 150 provided in the first lenticular lens portion 15, the rotation symmetry of the light beam reflected on the surface of the refracting total reflection plate 1 is lost, and the downward direction can be prevented from being concentrated on the transmissive screen 100. Near the lower or inner part. In addition, by using the micro lens 150 to diffuse an unnecessary light beam on the exit surface of the refracting total reflection plate 1, the ghost light and the ghost light in the upward direction can be made inconspicuous.

As in the second embodiment, the refraction total reflection Θ may be formed in different directions. A ~ a of Beshi Form 4 is a schematic view of a penetrating wide projection display device. In Figure 12, the

?: 2: 103-5342-PF (Nl); Ahddub.ptd Page 32 200408901 V. Description of Invention (27) ^ The longitudinal section of the longitudinal centerline A-A of the penetrating screen 100 shown in ^. In FIG. 12, the same symbols are used to represent the constituent elements common to FIG. 1, and the detailed description is omitted for n. ~ In the fourth embodiment, in order to reduce the image shift caused by the bending of the refracting total reflection plate 1, a flat plate-shaped first transparent substrate 8 made of glass is used as the core member of the refracting total reflection plate 1. In addition, the refracting total reflection plate 1 having the same shape as that of the other embodiments described above is manufactured by bonding incinerators made of other materials on both sides of the first transparent substrate 18 made of glass with an adhesive. As can be seen from the enlarged view in Fig. 12, the refractive total reflection plate 1 of the fourth embodiment includes a first transparent substrate 18, a refractive total reflection sheet (transparent total reflection structure) 1FLS, and a lenticular lens sheet 1LCS. The refracting total reflection sheet 1FLS has a polyethylene terephthalate sheet 1PET1, a refracting total reflection film iFL formed on one side of polyethylene terephthalate = sheet 1PET1, and a refracting total reflection film 1 The reflection reducing coating 16 provided on the surface of the FL is a reflection reducing coating. 1 pair of monoethylene glycol formate film 1 P E T 1 is a flat transparent film made of polyethylene terephthalate and used as the bottom layer (support layer) for forming a refracting total reflection film 1FL. The refracting total reflection film ifl is formed of a transparent UV-curable resin. Here, a ring-shaped body with the same tooth shape as the other embodiments described above is formed, that is, the refractive inclined surface 11, the ineffective facet 丨 2, the total reflection inclined surface 13 and the transmission inclined surface. 14. A UV-curable resin was placed on the polyethylene terephthalate sheet ipET1, and the resin was cured by irradiating ultraviolet rays to form a refracting total reflection film 1 FL. The refractive indices of the first transparent substrate 18, the polyethylene terephthalate sheet 1PET1, and the refracting total reflection film 1FL are as close as possible. Also, reduce reaction

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The spray application layer 16 may be a single-layer application composed of a single layer, or a double-layer application composed of two layers. In the case of single-layer coating, it is better to form a reflection-reducing coating layer 16 using a material having a lower refractive index than the refractive index of the material of the refracting total reflection plate 1. In the case of double-layer coating, the reduced reflection coating layer 6 has a first layer coated on the refractive total reflection film 1 FL and formed of a material having a refractive index higher than that of the refractive total reflection film FL and a coating layer The second layer formed of a material having a refractive index lower than that of the refractive total reflection film 1 FL on one layer is preferable. The same, the lenticular lens sheet 1LCS has a polyethylene terephthalate sheet 1PET2, a lenticular lens film 1LC formed on one side of a polyethylene terephthalate sheet ipet2, and a surface of the lenticular lens film ilc The anti-reflection coating 17 is provided to reduce the reflection. Polyethylene terephthalate sheet 丨 pET 2 is a plate-shaped transparent film made of polyethylene terephthalate and used as the bottom layer (support layer) for forming a lenticular film 1LC. The lenticular lens film 1LC is formed of a transparent UV-curable resin. Here, the first lenticular lens portion 15 (FIG. 1 and FIG. 9) or the array of microlenses 150 of the other embodiments described above is formed. Ethylene glycol vinegar tablets are placed on top of each other, and the resin is hardened by irradiating ultraviolet rays to form a lenticular film 1LC. The refractive indexes of the first transparent substrate 18, the polyethylene terephthalate sheet 1PET1, and the lenticular lens film 1LC are preferably as close as possible. In addition, the reflection-reducing coating layer 17 may be a single-layer coating composed of a single layer. The refractive total reflection sheet 1FLS composed of two layers may be made of a transparent adhesive.

200408901 V. Description of the invention (29) It is connected to one surface of the first transparent substrate 18, and the lenticular lens sheet 1LCS is made of an adhesive layer 1GLU2 composed of an adhesive, which is fixed to one surface of the first transparent substrate 18. An effect of the fourth embodiment will be described three times with reference to FIG. 13. In this 4P U-type screen, the image displayed by the transmissive type due to the slight bending of the refracting total reflection plate 1 may also be greatly shifted. For example, because the transmission type ^ uses a device casing not shown in the figure to surround its surroundings, the refracting total reflection plate is stretched due to temperature changes and other reasons. As shown by the imaginary line in Figure 13 , Becomes a bend bent to position 1 d: the displacement of the restricted central portion is large. When this occurs, such as θ η 22, the display position on the transmissive screen 100 is shifted to the display image light 8 as an example until the position 8d is shifted. Because the penetration type 2 \ 's position is not dependent on the amount of bending and bending,

Point of the hole.卩 7 knife, the display position offset is large, and the offset is small in Mangu-A. In $ 曲 小 之 片 '显 不 位 片 1 flI ί: ΐ: shu 4' can be suitable for the difficult-to-form refracting and total reflection flat plate: Xi Di Yi ΐ 1 LCS material independent selection molding is easier to cause Second expansion I, bright substrate 18 material. 1 ^, by using the first transparent substrate 18 made of glass made of temperature-based material, the following steps are taken: Ϊ Ϊ: the core member 'can reduce the bending of the total reflection plate 1' and reduce the display position of the image. The expansion ratio is about 100 (1 / κ: κ is absolute. For example, the linear rate of acrylic is about 9 (1 / κ), which is acrylic ::: ': Linear expansion of glass For the pressure from the outside than acrylic :, about 1/10. It is also reported more because of the strength of the brother, and it can be easily

Page 35 200408901 V. Description of the invention (30) The manufacture of high flatness plate can be said to be suitable for suppressing the position shift of the image caused by bending. In addition, Embodiments 1 to 4 of the present invention can also be applied to a projection type display device having the arrangement shown in Fig. 14. In the projection type display device shown in FIG. 14, the plane mirror 2 and the transmission screen 100 face each other, but are inclined so as to approach the transmission screen 100 as they move upward. The projection optical system 4 is located between the plane mirror 2 and the transmembrane screen 100 in a plan view and is arranged below, but emits a projection light beam approximately upward. The projection type display device configured as shown in FIG. 14 undergoes elongation at the refracting total reflection plate 1 and, as shown by the imaginary line in FIG. 14, is also bent to a position of 1 d and becomes worn. The display position on the translucent screen is shifted until the display image light 8 shown in FIG. 14 is shifted to the position 8d. In the arrangement of Fig. 14, compared with the arrangement of Fig. 13, although the shift of the display position for the same bend is small, there may be cases where the shift of the display position is displayed due to the amount of bend. If the refractive total reflection plate i is formed as in Embodiment 4, for the same reason as above, the first transparent substrate 18 made of glass made of a material with small expansion and contraction due to temperature is used as the core member. 'Can be curved', thereby reducing the display position shift of the image ϊ ° As shown above, the effect of this embodiment is the small expansion and contraction caused by the first film 1FLS or the double convex transparent plate shape. According to this embodiment 4, In addition, the material of the transparent substrate 18 can be independent of the material suitable for forming the lens 1 LCS. The material made of glass is more difficult to select and form than the above-mentioned refracting and total refraction. If the temperature is used, the first transparent substrate 18 is used.

200408901

As the core component a of the refracting total reflection plate 1, push it down, and reduce the bending of the refracting total reflection plate 1 at noon τ. In addition, the substrate 18 can be obtained or manufactured easily and inexpensively by forming a glass substrate. A transparent substrate 18, which is formed on the first transparent and first glass which is excellent in planarity, is hardly cracked by punching the surface of the transparent substrate 18 with refraction. So good. The transparent substrate 18 is susceptible to cracking when it is alone, but the structure in which the reflection sheet 1FLS and the lenticular lens sheet 1LCS sandwich the first and the back has become a significant improvement in the yield of externally-manufactured k-day guards and assembly talents. One day ^ velvet 4 Q implements form 4, can also be made with materials other than glass. First: anti. For example, a synthetic resin plate 18 such as a projection-type display device, a display device, and a display device having a linear expansion ratio larger than that of glass is used under conditions where the temperature change is small. If the transparent substrate 18 is formed of acrylic, the plate 18. It is easy and cheap to obtain or manufacture, and can make Embodiments 1 to 4 above the first transparent base f. The refractive total reflection plate 1 has a refractive region, a refractive and total reflection region 1M, and a total reflection region ... The total reflection plate may have only the refraction and total reflection areas 1M and the total reflection area, and may have only the refraction area 1L and the refraction and total reflection areas 1M. According to various parameters such as the angle of the projected beam from the projection optics 4, the desired exit angle from the refracting total reflection plate, and the required efficiency, the specific structure of the refracting total reflection plate is determined using, for example, computer simulation. The present invention has been described in detail above with reference to a preferred embodiment.

200408901 V. Description of Invention (32), but within the spirit and scope of the invention described in the scope of patent application, various changes in form and details can be made, as long as it is understood by the practitioner. Such changes, substitutions, and corrections are also included in the scope of the present invention. Industrial Applicability As described above, according to the present invention, it is possible to provide a high-quality projection image with reduced interference light.

21J03-5342-PF (N1); Ahddub.ptd page 38 200408901 Brief description of the drawing Figure 1 shows the outline of the embodiment 1 of the present invention including a transmissive screen projection display device. ° Figure 2 is from Back view of a perspective view of the penetrating screen of the present invention. Fig. 3 is a longitudinal sectional view of a penetration type screen of a comparative example. Fig. 4 is a diagram showing a mechanism of directional ghost light when the transmissive screen of Fig. 3 occurs. Fig. 5 is a diagram showing the mechanism of ghost light and ghost light in the direction of the transmissive screen in Fig. 3; Fig. 6A is a graph showing an experimental result for confirming the effect of the penetration type report of the first embodiment of the present invention. Fig. 6B is a graph showing the production of a refractive total reflection plate used in this experiment. FIG. 6C is a graph showing measurement conditions in this experiment. 7A and 7B are photographs showing the effect of a transparent screen according to Embodiment 1 of the present invention. Fig. 8A is a photograph of the image of a square ^ ^ | shadow ^ ^, p n? Fig. 8B is a photograph taken in accordance with a photograph of the wearer. After the improvement shown by the master and Qin, Figure 8C is a picture taken according to the picture taken by the gray screen. The penetration of x through the shape of the penetrating silver of Form 1 Γ :. The transmissive screen 1 according to the second embodiment of the present invention is shown. . Figure 10 shows the design of a suitable refracting total reflection plate of the second embodiment.

200408901

The diagram simply illustrates the value graph. Fig. 11 is a perspective view showing a refracting total reflection plate of the present invention when viewed from the side of the exit surface of light; FIG. 12 is a schematic diagram showing a projection type display including a # in Embodiment 4 of the present invention. A penetrating screen is shown in Fig. 13. Fig. 13 is a diagram for explaining the effect of the fourth embodiment. Fig. 14 is a schematic diagram showing another arrangement to which the present invention is applied, and is a diagram for explaining the effect of the fourth embodiment. Type display clothes symbol description 1 refraction total reflection plate, 3 imaging display plate, 5L, 5M, 5U projected light, 9 observers, 1 2 invalid facets, 1 4 transmission bevel, 16 reduced reflection coating, 1 8 first Transparent substrate, 1 L refraction area, 1 U total reflection area, 4M convex mirror, 2 plane mirror, 4 projection optical system, 8 display image light, 11 refraction slope, 1 3 total reflection slope, 1 5 first lenticular lens portion, 1 7 Anti-reflection coating, 19 zigzag structure, 1M refraction and total reflection area, 4R refraction optical system, 100-percent screen

Claims (1)

200408901 VI. Application Patent Scope 1. A kind of penetrathine penetrating tooth-shaped incident surface is imaged and displayed on the projected image; it is characterized by moving forward on the refraction exit surface and forming the transmission oblique surface on the refraction surface 2. If applied The total reflection plate includes a body arranged on the substrate to form a refractive oblique 3 · If an oblique surface is applied, the projected light oblique surface will be transmitted through and reflected. 4. If the lens portion of the application total reflection plate is along the upper lens 0-transmission screen, it includes: a mirror-shaped refractive total reflection plate having a projection light incident mine and a projection light exiting exit surface; and the plate The light emitted by the refracting total reflection plate is obtained by imaging: the total reflection number refracting inclined surface concentric circular reflecting plate patent fan is substantially flat refracting surface, the transparent patent direction penetrates the transmitting inclined patent surface and the incident surface of the direction plate below the emitting surface is After the projected light is refracted, the light is reflected toward the emitting inclined surface and the plural transmitting inclined surfaces through which the projected light is transmitted, and then the light is reflected toward the outgoing surface, which is totally reflected; formed by a transparent material without scattering particles. The transmissive screen according to item 1, wherein the first transparent substrate in the form of a refracting plate and the first transparent total reflection structure, the inclined surface and the total reflection slope in the refractive total reflection structure. The transmissive screen surrounding item 1 includes the refracting screen refracting in the approximate normal direction, and the total reflection of the projected light toward the transmissive screen. Fold up the first double-convex pleated shirt T 心 cat heart gauge, extend in the first double-convex arrangement in the horizontal direction & 1 set of cylindrical penetrating 5. Such as the penetrating type of the scope of the patent application ♦ Among them, the first 200408901 VI. Scope of patent application '1 2 The lenticular lens part is formed of a material different from the refractive total reflection plate, and is arranged on the exit surface of the flat reflection refracting total reflection plate. 6. The transmissive screen according to item 1 of the patent application, wherein the exit surface of the refracting total reflection plate is provided with an array of microlenses that diffuse light in multiple directions. 7. The transmissive screen according to item 1 of the scope of patent application, wherein the imaging display panel includes a second lenticular lens portion that diffuses light emitted from the self-reflecting total reflection plate in a horizontal direction and receives the light emitted from the second lenticular lens portion. The second transparent substrate of the light is a second transparent substrate in which a plurality of cylindrical lenses extending in the horizontal direction are arranged in the second lenticular lens portion in a horizontal direction and project upward and downward. 8. For the penetrating screen of item i in the scope of patent application, a reflection-reducing coating layer is formed on the incident surface of the refracting total reflection plate to reduce the reflection of visible light. 9. If the penetrating screen of item 1 of the scope of the patent application, in which the exit surface of the total reflection plate is opened), Hyun ya K ^ ^ is a penetrating screen that reduces the reflection of visible light, Among them, a penetrating screen is formed on the folding surface to reduce the reduction of visible light reflection. Among them, the refractive index of the material of the refracting total reflection plate is reduced. 12. As the penetrating screen of item 8 of the patent application scope, among which, Page 42 1 0 · As in the scope of patent application, the incident surface of the first total reflection plate and the low reflection coating layer. 2 · As in the patent application No. 8, the reflective coating layer is a single-layer coating using a material with a low refractive index ratio. 200408901 1 3 · If the refracted inclined surface of the total reflection plate of the patent application scope, the first area near the central axis passes through the normal direction of the screen. The second area of the central axis forms an oblique forward direction. In the penetrating screen of the item, in which the inclined plane is formed by the refraction slope and the total reflection slope, the projected light is transmitted in a specific direction, and the projection light is farther away from the common surface in the first region, so that the projected light is directed to the transmission screen 4 · As for the penetrating screen of item 3 of the patent application scope, the smaller the angle between the forward direction and the normal direction of the penetrating screen before the light is projected farther away from the common center axis, the smaller the included angle changes The angle. 1 5 · A projection-type display device including: a projection optical system that emits a projection beam that expands as it progresses; a penetrating screen such as the one in the scope of patent application; and a flat mirror that reflects from the penetrating screen The projection light beam of the projection optical system is characterized in that: the projection optical system is arranged between the transmission screen and the plane mirror and below. W ^ >-5342-PF(N1); Ahddub. P t d p. 43