JP2007094299A - Light diffusing plate, lenticular lens plate having the light diffusing plate, and transmissive screen - Google Patents

Abstract

The present invention provides a high-luminance, high-resolution, high-quality image with substantially no scintillation even when a projection light source is a bright light source with a uniform direction of light, such as a liquid crystal projector. It is an object of the present invention to provide a light diffusing plate used for a transmissive screen capable of achieving the above, a lenticular lens plate including the diffusing plate, and a transmissive screen.
A light diffusing plate used in a transmissive screen composed of a combination of a lenticular lens plate and at least a Fresnel lens plate, wherein the light diffusing plate is a multilayer structure of two or more layers made of a translucent resin material. A light diffusing plate, wherein at least one of the layer interfaces forms a fine uneven surface, and a surface area ratio to the mirror surface is greater than 1, and a lenticular lens comprising the light diffusing plate A plate and a transmission screen.
[Selection] Figure 7

Description

  The present invention relates to a light diffusing plate used in a transmissive screen composed of a combination of a lenticular lens plate and at least a Fresnel lens plate, and in particular, forms an image of projection light from a liquid crystal projector in a transmissive liquid crystal projection television (and A light diffusing plate functioning by diffusing and transmitting light), substantially free of scintillation and capable of obtaining a high-brightness, high-resolution, high-quality image, a lenticular lens plate including the light diffusing plate, and The present invention relates to a transmission screen.

  As a general form of the transmissive screen, a light diffusion layer that is composed of a combination of a Fresnel lens sheet and a lenticular lens sheet, and functions by imaging (and diffusing and transmitting) the projection light from the projector, Present anywhere on the screen.

  The lenticular lens sheet can spread the projection light in a predetermined angle range that is the direction in which the convex cylindrical lenses are arranged in parallel (generally in the horizontal direction), but hardly spread the projection light in the direction perpendicular thereto. A light diffusion layer is necessary to play a role of spreading light in the vertical direction.

  The light diffusing material has a high ratio of diffused light transmittance (cloudiness value) to the total light transmittance of a transmissive screen using the light diffusing material, excellent light utilization efficiency, high color temperature, CRT and liquid crystal Performances such as see-through in which the light from a light source such as a projector is observed and a hot bar in which a partially striped bright portion is not observed are required.

  Examples of such light diffusing materials include inorganic light diffusing materials such as silica, muscovite, alumina, calcium carbonate, and glass beads described in Patent Document 1, acrylic resins, styrene resins, and the like described in Patent Document 2. These copolymers and amorphous organic light diffusing materials such as silicone resins described in Patent Document 3 are used. As shown in FIG. 8, these light diffusing materials disperse the light diffusing material 132 uniformly in the lenticular lens sheet 130, or the light diffusing material 142 is disposed inside the lenticular lens sheet 140 as shown in FIG. It is used by being unevenly distributed on the emission side.

  On the other hand, as a projection image source used in combination with a transmissive screen, a liquid crystal projector using a liquid crystal panel instead of a CRT has been developed in recent years. Since this liquid crystal projector forms an image by allowing light to pass or block for each pixel, the light from the light source is usually made parallel light and incident on the liquid crystal panel. Therefore, the light for each pixel that has passed through the liquid crystal panel is not diffused unlike the CRT that emits light for each pixel, but is more uniform in direction. In addition, since a generally used liquid crystal panel is smaller than a CRT, the direction of light for each pixel is more aligned on the screen than the CRT.

Patent literature is described below.
JP 60-46503 A JP-A 61-4762 Japanese Patent Laid-Open No. 1-172801

  When using a bright projection video source (light source) with a uniform direction of light as in such a liquid crystal projector, the transmissive screen using a light diffusing material as described above, which has been used in the past, will display the image. As shown in FIG. 5, there is a problem that a partial change in luminance due to the light diffusing material is clearly recognized, and a phenomenon called scintillation occurs in which the entire screen is glaring. In particular, when a still image such as a computer is projected, this scintillation is felt strongly, and there is a problem that the image becomes very difficult to view.

  In order to solve such a scintillation problem, first, as a result of evaluating the influence of the particle shape of the light diffusing material on the scintillation, the spherical light diffusing material generated scintillation most remarkably. On the other hand, the irregular light diffusing material has a lower level of scintillation than the spherical light diffusing material, but cannot completely suppress the occurrence of scintillation. In addition, in the irregular diffusing material, a phenomenon of see-through of the light source called see-through occurs, which is not satisfactory as a light diffusing material for a transmissive screen. As a result of further investigation, in order to sufficiently suppress the occurrence of scintillation and to suppress the occurrence of see-through, the thickness of the light diffusion layer is increased or the screen gain is reduced, that is, the addition of a light diffusion material is added. It was found that it is necessary to increase the amount and to increase the diffusivity as much as possible. However, as the thickness of the light diffusing layer is increased, the resolving power decreases, and when the screen gain is decreased, the brightness of the projection television itself decreases. Yes.

  Therefore, the present invention has been made to solve the above-described conventional problems, and scintillation is substantially achieved even when a bright light source having a uniform direction of light such as a liquid crystal projector is used as a projection source. An object of the present invention is to provide a light diffusing plate used in a transmissive screen or the like that can obtain a high-luminance, high-resolution, high-quality image without generating, and a lenticular lens plate and a transmissive screen provided with the diffusing plate And

In order to achieve the above object, that is, the invention according to claim 1,
In a light diffusing plate used for a transmission type screen composed of a combination of a lenticular lens plate and at least a Fresnel lens plate,
The light diffusion plate has a multilayer structure of two or more layers made of a translucent resin material, and at least one layer interface of the layer interfaces forms a fine uneven surface, and the surface area ratio with respect to the mirror surface is 1 It is a light diffusion plate characterized by being large.

The invention according to claim 2
2. The light diffusing plate according to claim 1, wherein a light diffusing material is mixed in any layer of a multilayer structure of two or more layers made of the translucent resin material.

The invention according to claim 3
The light diffusion material of 1 or less is mixed in the layer which becomes the observation side outermost surface of the multilayer structure of two or more layers made of the translucent resin material when the total resin weight is 100. Item 3. The light diffusing plate according to Item 1 or 2.

The invention according to claim 4
A lenticular lens plate comprising the light diffusing plate according to claim 1 as a support for a lenticular lens sheet.

The invention according to claim 5
A transmission type screen comprising a combination of the lenticular lens plate according to claim 4 and at least a Fresnel lens plate.

  According to the present invention, the light diffusing plate constituting the transmissive screen has a multilayer structure of two or more layers made of a resin material, and at least one layer interface of the layer interfaces forms an uneven surface, and the surface area with respect to the mirror surface Since the ratio is larger than 1, the optical path difference per unit beam is increased, so that scintillation (speckle) can be controlled.

  In addition, since the amount of the light diffusing material contained in the light diffusing plate can be reduced, high brightness, high resolution, and high quality images can be obtained.

  Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view showing an example of the configuration of the light diffusion plate of the present invention. FIG. 2 is a schematic cross-sectional view showing another example of the configuration of the light diffusion plate of the present invention. FIG. 3 is a schematic cross-sectional view showing another example of the configuration of the light diffusion plate of the present invention. FIG. 4 is a schematic explanatory view illustrating an example of a method for manufacturing a light diffusion plate of the present invention. FIG. 5 is a schematic explanatory view for explaining another example of the method for producing a light diffusion plate of the present invention. FIG. 6 is a schematic cross-sectional view in the vertical direction showing an example of a lenticular lens plate provided with the light diffusion plate of the present invention as a support. FIG. 7 is a schematic perspective view showing an example of the transmission screen of the present invention and a schematic sectional view in the vertical direction of the transmission screen.

  The light diffusing plate of the present invention has a multilayer structure of two or more layers made of a translucent resin material, and at least one layer interface of the layer interfaces forms a fine uneven surface, and the surface area ratio to the mirror surface is It is characterized by being greater than 1. As an example of the light diffusing plate of the present invention, as shown in FIG. 1, for example, the light diffusing plate includes a first layer (1) made of a translucent resin material and a second layer (2) made of a translucent resin material. A light diffusion plate having a two-layer structure, in which the layer interface between the first layer (1) and the second layer (2) forms a fine uneven surface (3), and the surface area ratio with respect to the mirror surface is 1 It is a light diffusing plate (10) characterized by being large.

  As another example of the light diffusion plate of the present invention, as shown in FIG. 2, for example, a first layer (1) made of a translucent resin material and a second layer made of a translucent resin material ( 2) a light diffusing plate having a two-layer structure, in which a light diffusing material (4-2) is mixed in the second layer (2), and the first layer (1) and the second layer ( The light diffusion plate (20) is characterized in that the layer interface of 2) forms a fine uneven surface (3) and the surface area ratio to the mirror surface is larger than 1.

  Furthermore, as another example of the light diffusion plate of the present invention, as shown in FIG. 3, for example, a first layer (1) made of a translucent resin material and a second layer made of a translucent resin material ( 2) a light diffusing plate having a two-layer structure, in which a light diffusing material (4-2) is mixed in the second layer (2), and the first layer (1) which is the outermost surface on the observation side ) Is also mixed with the light diffusing material (4-1), and the mixing amount of the light diffusing material (4-1) of the first layer (1) is defined as 100 as the total resin weight constituting the light diffusing plate. When 1 or less light diffusing material is mixed, the layer interface between the first layer (1) and the second layer (2) constituting the light diffusing plate forms a fine uneven surface (3). The light diffusing plate (30) is characterized in that the surface area ratio to the mirror surface is larger than 1.

In the above, the light diffusing plate having a two-layer structure is exemplified, but the present invention is not limited to these, and a multi-layer structure of two or more layers made of a translucent resin material, and at least one layer interface of the layer interface has fine irregularities. In other words, the surface area ratio to the mirror surface may be larger than 1.

  Examples of the light transmissive resin material constituting the light diffusion plate used in the present invention include acrylic resin, methacrylic resin, polycarbonate resin, polyester resin, styrene resin, acrylic-styrene copolymer resin, vinyl chloride resin, and ultraviolet curable resin. Ordinarily used transparent resins such as can be appropriately selected and used.

  As the light diffusing material used in the present invention, those conventionally used can be used, for example, organic fine particles or glass beads made of styrene resin, acrylic resin fine particles, silicone resin, etc. Inorganic fine particles made of silica, alumina, calcium carbonate, or the like can be used. As these fine particles, those having an average particle diameter (diameter) of 1 to 30 μm are used. The light diffusing material may have a spherical shape or an indefinite shape, or a spherical shape and an indefinite shape may be used in combination.

  The mixing amount of the light diffusing material can be appropriately set according to the screen gain required for the transmissive screen and according to the layer thickness constituting the light diffusing plate.

  The light diffusing plate manufacturing method of the present invention will be described with reference to the light diffusing plate (20) shown in FIG. As a method of manufacturing the light diffusing plate of the present invention, for example, as shown in FIG. 4, an embossing die (40) finished to a surface satisfying a fine concavo-convex surface having a surface area ratio to the mirror surface larger than 1 is prepared. Then, the mold surface shape (41) is transferred and molded by the embossing method to one side of the translucent resin sheet (1) constituting the first layer by a hot press (P, P ′) [FIG. 4 (a). reference]. A light diffusing material (4-2) having a desired average particle diameter (diameter) is mixed into the fine uneven surface (3) of the translucent resin sheet having the surface shape transferred, for example, UV curable. A diffusion coating made of resin (51) is uniformly applied and formed to a predetermined thickness by a coating device (50) such as a die coater or a blade coater [see FIG. 4 (b)]. Subsequently, after placing and pressing a transparent plastic sheet or plate (70) transparent to ultraviolet rays so as to be in contact with the coated surface, a desired ultraviolet irradiation device (60) is passed through the transparent plastic sheet or plate (70). Then, the ultraviolet curable resin (51) is cured by irradiating with ultraviolet rays, and at the same time, the light transmissive resin sheet (1) is adhered and laminated to be integrated [see FIG. 4 (c)]. Thereafter, the transparent plastic sheet or plate (70) is peeled off [see FIG. 4 (d)], and the first layer (1) made of a translucent resin material and the second layer made of the translucent resin material. A light diffusion plate having a two-layer structure comprising (2), wherein a surface area ratio to a mirror surface in which the layer interface between the first layer (1) and the second layer (2) forms a fine uneven surface (3) A light diffusing plate (20) larger than 1 is obtained [see FIG. 4 (e)].

  Further, as another manufacturing method of the light diffusing plate of the present invention, as schematically shown in FIG. 5, embossing finished to a surface satisfying a fine concavo-convex surface having a surface area ratio with respect to the mirror surface larger than 1 is performed. The translucent resin sheet (81) in a molten state is extruded from the T die (80) of the extruder between the cooling roll (82) and the pressure roll (83), and the emboss is transferred. The translucent resin sheet (84) which is cooled and solidified at the same time as the molding and peeled from the embossed cooling roll (82) to transfer and shape the surface shape is obtained by the guide rolls (a, b). A diffusion coating (86) made of, for example, an ultraviolet curable resin mixed with a light diffusing material (4-2) having a desired average particle diameter (diameter) is conveyed and subsequently applied in the same process. 85). A uniform thickness of a predetermined thickness is applied on the fine irregular surface of the sheet (84) and irradiated with ultraviolet rays by a desired ultraviolet irradiation device (87) to cure the ultraviolet curable resin and simultaneously transmit light. The light diffusing plate (88) of the present invention obtained by bonding and laminating to the resin sheet (84) is obtained. According to this manufacturing method, since it can produce continuously in the same process, the manufacturing method with very high production efficiency can be provided.

  The A portion of the translucent resin sheet (84) on which the above-mentioned surface shape is transfer-molded is enlarged and a partially enlarged sectional view thereof is shown in FIG. A translucent resin sheet (84) forming the first layer (1) made of the translucent resin material constituting the light diffusing plate of the present invention having a fine uneven surface (3) formed on one side is obtained. Moreover, the b part of said light diffusing plate (88) is expanded, and the partial expanded sectional view is shown in the figure (c). It has a two-layer structure consisting of a first layer (1) made of a translucent resin material and a second layer (2) made of a translucent resin material, and the second layer (2) has a light diffusing material. (4-2) is mixed, and the layer interface between the first layer (1) and the second layer (2) forms a fine uneven surface (3), and the surface area ratio with respect to the mirror surface is larger than 1. This is the light diffusion plate (20) of the present invention.

  The light diffusing plate obtained above can be a lenticular lens plate (90) provided with this light diffusing plate (20) used as a support of the lenticular lens sheet (100) as shown in FIG.

  As an example of the lenticular lens sheet (100), a convex cylindrical lens (101) is arranged on one side of a transparent base material (102), and a convex cylindrical lens (101 is provided on the base material side opposite to the lens. ) On the surface of the black light-shielding layer (103) of the lenticular lens sheet (100) in which black light-shielding layers (103) called black stripes (BS) are provided in stripes at positions corresponding to the non-condensing portions of As an example, a lenticular lens plate (90) having a light diffusion plate (20) is obtained.

  The method for laminating the light diffusing plate (20) on the lenticular lens sheet (100) is not particularly limited. For example, the light diffusing plate (20) can be laminated by using a light-transmitting optical adhesive or adhesive. The lenticular lens plate (90) provided with the light diffusion plate (20) can be easily manufactured as an example used for the transmission type clean of the present invention.

  The convex cylindrical lens (101) portion is made of, for example, an active energy ray-curable resin cured product such as ultraviolet rays, and an active energy ray-curable resin such as ultraviolet rays is applied to the molding surface of the embossing roll mold to be transparent. The base material (102) is supplied to an embossing roll mold, irradiated with active energy rays such as ultraviolet rays through the transparent base material (102), and the resin is cured, and at the same time, a convex cylindrical lens (resin molded product) 101) is polymerized and bonded to the transparent substrate (102), or the active energy ray-curable resin composition is applied to the transparent substrate (102) and supplied to the embossing roll mold. The transparent substrate (102) The resin is cured at the same time through irradiation with active energy rays, and at the same time, a convex cylindrical lens (101), which is a resin molding, is applied to the transparent substrate (102). While it molded by a method such as allowed to focus adhesion, is not particularly limited to these methods. The shape of the convex cylindrical lens (101) may be circular or aspherical, and the shape is not particularly limited. The shape and dimensions of these lenticular lenses can be appropriately set according to the required performance of the transmission screen.

  The transparent substrate (102) is a transparent support for supporting the convex cylindrical lens portion, and is not particularly limited as long as it is a transparent material. Polyethylene terephthalate (PET), polycarbonate (PC ) A film substrate is preferred.

The black light-shielding layer (103) has adhesiveness on the flat surface of the transparent substrate (102) on the opposite side of the convex cylindrical lens (101). An ultraviolet curable resin layer having disappearance characteristics is applied or formed by laminating a film-like ultraviolet curable resin. Next, ultraviolet rays are irradiated through the convex cylindrical lens (101), and the viscosity of the resin is used for the uncured portion of the ultraviolet curable resin layer other than the portion that has been condensed and cured by the lens action, so that the black The powder toner is adhered only to the uncured portion to form a black light shielding layer (103). Examples of the black powder toner include black pigments, pigments, carbon, metal salts, or black-colored acrylic resins, organic silicone resins, polystyrene, urea resins, and formaldehyde condensates, but are not particularly limited. . If necessary, two or more kinds of black powder toners may be used in combination.

  Alternatively, ultraviolet rays are irradiated through the convex cylindrical lens (101), and the viscosity of the resin is used for the uncured portion of the ultraviolet curable resin layer other than the portion which is condensed and cured by the lens action, A transfer sheet having a colored layer is overlapped on the colored layer side, and the colored layer is attached only to the uncured portion by utilizing the viscosity of the resin in the uncured portion, and then the cured layer is coated with the lenticular lens sheet. The black light-shielding layer (103) may be formed by peeling from the film. The transfer sheet is not particularly limited to the material and configuration of the transfer sheet as long as it is a transfer sheet having a black colored layer, and a general-purpose transfer sheet can be used.

  Also, if necessary, the lenticular lens plate can be colored, and the image quality can be reduced by preventing the reflection of external light on the observation side outermost surface of the light diffusing plate (10, 20, 30) of the lenticular lens plate. An antireflection film can be formed, or the surface can be used as a matte surface, or a hard coat layer can be formed for the purpose of imparting scratch resistance to prevent scratches on the exit side surface. Furthermore, if necessary, a low reflection layer, a polarizing filter layer, an antistatic layer, an antiglare layer, and the like can be formed.

  The lenticular lens plate is colored by mixing and dispersing in a plastic material constituting the lenticular lens sheet using a dye or a fine pigment. As the color to be colored, an achromatic color such as gray or a color that selectively absorbs or transmits a specific color that controls the balance of the three primary colors (red, green, and blue) in the spectral characteristics of the light source is used. be able to. For example, by coloring the light diffusing plate (10, 20, 30) of the lenticular lens plate, the external light is absorbed more than the projection light from the light source, so that the contrast of the image can be improved.

The antireflection film can be formed, for example, on the observation-side outermost surface of the light diffusion plate (10, 20, 30) of the lenticular lens plate by vapor deposition or coating. In the case of vapor deposition, a dielectric such as MgF ₂ or SiO ₂ can be used, and in the case of coating, a fluorine resin or the like can be used.

  The hard coat layer can be formed of, for example, an ultraviolet curable paint on the observation-side outermost surface of the light diffusing plate (10, 20, 30) of the lenticular lens plate. UV curable coatings are generally composed mainly of polymers, oligomers, monomers, etc. that have radically polymerizable double bonds or epoxy groups in their structure as film-forming components. Contains sensitizers and sensitizers. What is preferable for the present invention is that the film-forming component uses a polyfunctional (meth) acrylate-based ultraviolet curable coating having an acrylate functional group, so that surface hardness, transparency, abrasion resistance, scratch resistance, etc. It is possible to form an excellent hard coat layer.

It can be applied by any coating method such as blade coating, rod coating, knife coating, reverse roll coating, spray coating, offset gravure coating, etc. A gravure coating, a gravure reverse coating, a reverse roll coating, an offset gravure coating method and the like excellent in properties and the like are suitable. Moreover, it can also form by transfer using the transfer sheet which used the hard-coat layer as the transfer layer The whole thickness of a lenticular lens board can be suitably selected according to the product size to apply, for example, 1-5 mm, Preferably it is 2 It can be set to -4 mm. When a higher resolution is required, the thickness is preferably 3 mm or less.

  As an example of a support for the lenticular lens sheet (100) obtained above, a lenticular lens plate (90) provided with a light diffusion plate (20) using the light diffusion plate (20) of the present invention is shown in FIG. As shown, a transmissive screen (110) can be combined with a Fresnel lens plate (120) having a concentric Fresnel lens (121). A longitudinal sectional view of this transmission screen is shown in FIG.

  In general, the transmission screen (110) can be used by combining a front plate (not shown) or the like with the observation surface closest to the emission surface. As the front plate, a durable transparent resin plate is used for the purpose of preventing dust or dirt from adhering to the surface of the screen or scratching. Of course, an antistatic layer, an antireflection film, a hard coat layer, and an antiglare treatment layer can be formed on the transparent resin plate. When such a front plate is disposed and used, the above-described antistatic layer, antireflection film, hard coat layer, antiglare treatment layer and the like formed on the emission surface of the above lenticular lens plate can be excluded.

  In the transmissive screen of the present invention, the light diffusion plate constituting the transmissive screen has a multilayer structure of two or more layers made of a resin material, and at least one of the layer interfaces forms an uneven surface. Since the surface area ratio with respect to the mirror surface is larger than 1 and the optical path difference per unit beam is large due to the multilayer structure, scintillation (speckle) can be controlled.

  In addition, since the amount of the light diffusing material contained in the light diffusing plate can be reduced, high brightness, high resolution, and high quality images can be obtained. This is particularly suitable when using a projected image with the same direction of light, such as a liquid crystal projector that tends to generate scintillation.

It is a schematic cross section which shows an example of a structure of the light diffusing plate of this invention. It is a schematic cross section which shows the other example of a structure of the light diffusing plate of this invention. It is a schematic cross section which shows another example of a structure of the light diffusing plate of this invention. It is a schematic explanatory drawing explaining an example of the manufacturing method of the light diffusing plate of this invention. It is a schematic explanatory drawing explaining the other example of the manufacturing method of the light diffusing plate of this invention. It is a schematic cross section of the vertical direction which shows an example of the lenticular lens board provided with the light diffusing plate of this invention as a support body. It is the model perspective view which shows an example of a structure of the transmission type screen of this invention, and its longitudinal cross-sectional view. It is a schematic cross section showing an example of a conventional lenticular lens sheet. It is a schematic cross section which shows the other example of the conventional lenticular lens sheet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... 1st layer which consists of translucent resin material 2 ... 2nd layer which consists of translucent resin material 3 ... Fine uneven surface in the interface of 2 layer structure 4, 132, 142 ... -Light diffusing material 4-1 ... Light diffusing material contained in first layer 4-2-Light diffusing material contained in second layer 10, 20, 30, 88 ... Light diffusing plate 40 ... Embossing die 41 ... Fine rugged mold on the surface of embossing die 50, 95 ... Coating device 60, 87 ... Ultraviolet irradiation device 70 ... Ultraviolet transparent plastic film (sheet)
DESCRIPTION OF SYMBOLS 80 ... Extruder T die 81 ... Translucent molten resin sheet 82 ... Cooling roll which has a fine uneven | corrugated type 83 ... Pressure roll 84 ... Translucent resin sheet which has a fine uneven surface 86 ... Light diffusion coating liquid 90 ... Lenticular lens plate provided with light diffusion plate 100 ... Lenticular lens sheet 101, 131, 141 ... Convex cylindrical lens 102 ... Transparent substrate 103 ... -Black light shielding layer 110 ... Transmission type screen 120 ... Fresnel lens plate 121 ... Concentric circular Fresnel lens

Claims (5)

In a light diffusing plate used for a transmission type screen composed of a combination of a lenticular lens plate and at least a Fresnel lens plate,
The light diffusion plate has a multilayer structure of two or more layers made of a translucent resin material, and at least one layer interface of the layer interfaces forms a fine uneven surface, and the surface area ratio with respect to the mirror surface is 1 A light diffusing plate that is large.   2. The light diffusing plate according to claim 1, wherein a light diffusing material is mixed in any layer of a multilayer structure of two or more layers made of the translucent resin material.   The light diffusion material of 1 or less is mixed in the layer which becomes the observation side outermost surface of the multilayer structure of two or more layers made of the translucent resin material when the total resin weight is 100. Item 3. The light diffusing plate according to Item 1 or 2.   A lenticular lens plate comprising the light diffusing plate according to claim 1 as a support for a lenticular lens sheet.   A transmission type screen comprising a combination of the lenticular lens plate according to claim 4 and at least a Fresnel lens plate.

Images