JPH052138U - Transmissive screen - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the change in brightness when viewing the screen of a transmissive screen from the top, bottom, left, and right. [Structure] Two lenticular sheets 12 and 54 each containing a predetermined light diffusing substance are provided on the front side of a Fresnel lens sheet 52, and each lenticular lens portion 12a,
12b, 54a, 54b are arranged so as to be orthogonal to each other. The light output from the Fresnel lens sheet 52 is vertically diffused by the lenticular sheet 12 and is horizontally diffused by the lenticular sheet 54.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to a transmissive screen, and more particularly to a rear projection type projection T The present invention relates to a transmissive screen suitable for a rear projection display device such as V.

[0002]

[Prior art]

  A rear projection type projector is one of the receivers that can display TV images on a large screen. There is an action TV. In this rear projection type projection TV, The image above is magnified and projected through the optical system on the back of a translucent transmissive screen. It is designed so that a magnified image can be viewed from the front side of the It has the feature that it can be configured into a pact.

[0003]   FIG. 3A shows a conventional transparent screen used for a rear projection type projection TV. Over-type screens are shown. In the figure, the transmissive screen 50 is a rear surface. Side Fresnel lens sheet 52 and the front side of this Fresnel lens sheet 52. It has a structure in which the scraped lenticular sheet 54 is overlapped. Transparent type As shown by the arrow FA, the clean 50 is irradiated with enlarged projection light from the rear. This light enters the transmission screen 54 vertically by the Fresnel lens sheet 52. Shoot.

[0004]   Fresnel lens sheet 52 and lenticular sheet 54 are generally PMMA ( It is formed of a transparent resin such as polymethylmethacrylate) resin. Also Ren The chicular sheet 54 is further uniformly mixed with an appropriate light diffusing substance such as fine glass powder. Has been. It should be noted that the Fresnel lens sheet 52 contains no light diffusing substance. .

[0005]   Next, the front and back surfaces of the lenticular sheet 54 may be vertically or vertically oriented. The lenticular lens parts 54a and 54b formed in the shape of a bracelet are continuously formed. The lenticular lens portions 54a and 54b prevent the disconnection of FIG. As shown in the surface, the light (arrow) incident in parallel from the rear Fresnel lens sheet 52 side. The mark FB) collects and disperses (arrow FC), and the brightness of the image is dispersed. .

[0006]   In addition, the convex portion between the lenticular lens portions 54a on the front side is coated with black paint or black. Black stripes 58 are provided by individualizing the color adhesive. This bra The back stripe 58 causes the screen to appear white or blurred due to extraneous light. Raw is prevented and contrast is improved.

[0007]

[Problems to be solved by the device]

  By the way, the viewing angle and the screen brightness in such a transmissive screen 50 are as follows. The relationship is as shown in FIG. In addition, this characteristic is The formed image is horizontally or vertically oriented with respect to its normal line 60 (see FIG. 3A). Shows the relationship between the viewing angle θ and the brightness of the image when viewed by the viewer 62 with the angle θ. This is a light diffusion directional characteristic.

[0008]   Light is dispersed left and right (horizontal direction) by the lenticular lens parts 54a and 54b. Be done. Therefore, in the horizontal direction, the characteristic becomes like the graph GA, and the angle θ is Even if it gets bigger, the brightness doesn't decrease so much.

[0009]   However, the lenticular lens parts 54a and 54b allow the light to go up and down (in the vertical direction). ) Can not be dispersed. In the vertical direction, the lenticular sheet 54 Only diffusion by the light diffusing substance acts. Therefore, in the vertical direction, The characteristics become similar to GB, and the brightness decreases significantly as the angle θ increases. become. Therefore, if you move your line of sight up and down, the brightness of the screen will change significantly. I will

[0010]   The present invention focuses on this point, and tilts the screen from either the vertical or horizontal direction. Even if you look at it, it is important to provide a transmissive screen with little change in brightness. Target

[0011]

[Means for Solving the Problems]

  This invention is a transparent lens with a lenticular sheet placed on the front side of the Fresnel lens sheet. On the over-type screen, stack the lenticular lenses so that they are orthogonal to each other. Two lenticular sheets arranged side by side and a small number of these lenticular sheets At least one side with a black stripe formed parallel to the lenticular lens part It is characterized by having.   Another idea is to provide at least one lenticular in the transmissive screen. A V-shaped groove is formed between the lenticular lens portions of the sheet.

[0012]

[Action]

  According to the present invention, the two lenticular sheets have the lenticular lens portions orthogonal to each other. It is arranged so as to overlap. Therefore, the light can be emitted in either the left or right direction Are diffused, and the light diffusion directional characteristic becomes good in any direction. Also, the lenticular When a V-shaped groove is formed between the lenticular lens portions of the lath sheet, the incident light is reflected by the V-shaped groove. Then, the light is totally reflected and is output to the front side of the screen.

[0013]

【Example】

  Hereinafter, an embodiment of a transmissive screen according to the present invention will be described with reference to the drawings. It In addition, the same reference numerals are used for the same or corresponding components as those of the conventional example described above. It

[0014] <Example 1>   First, a first embodiment of the present invention will be described with reference to FIG. In the figure The transmissive screen 10 is a Fresnel lens provided on the back side of the viewer. Window 52, lenticular sheet 54 provided on the front side, and between them The lenticular sheet 12 provided on the.

[0015]   Of these, the Fresnel lens sheet 52 and the lenticular sheet 54 are It has the same configuration as the above-mentioned conventional technique. Next, the lenticular sheet 12 Like the lenticular sheet 54, it is made of transparent resin such as PMMA resin and fine glass powder. The light-diffusing substance is uniformly mixed to form Fresnellen. The light incident from the sheet 52 in a substantially vertical direction is diffused.

[0016]   The structure of this lenticular sheet 12 is similar to that of the lenticular sheet 54. ing. That is, the front and back surfaces of the lenticular sheet 12 are lenticular. The lens portions 12a and 12b are continuously formed, and the lenticular Black stripes 14 are provided on the convex portions between the lens portions 12a.

[0017]   The black stripe 14 is formed, for example, by applying a black adhesive and singulation. Is made. That is, the lenticular sheets 12 and 54 are black strike The upper and lower parts 14 and 58 are overlapped so as to be orthogonal to each other. Then black stripes 14 black adhesive on the back of lenticular sheet 54 lenticular sheet 12 is adhered and both are integrated. The black stripe 14 is painted black. Of the black stripe 14 using a transparent adhesive. It is also possible to adhere the duller sheets 12 and 54.

[0018]   The lenticular sheets 12 and 54 adhered to each other are used for the Fresnel lens sheet. It is superposed on the base 52 and is entirely fixed integrally with a proper jig or the like.   Next, the operation of the transmissive screen 10 configured as described above will be described. . Enlarged projection light enters the transmissive screen 10 from the rear (see arrow FA in FIG. 3). Shoot. This light is refracted by the Fresnel lens sheet 52 and becomes lenticular. The light is incident on the port 12 almost vertically.

[0019]   In this case, the lenticular sheet 12 is lenticular as described above. The lenticular lens portions 12a and 12b are arranged orthogonally to the seat 54. It extends horizontally (left and right). Therefore, the incident light from the Fresnel lens sheet 52 The light will be diffused vertically (up and down). This diffused light is lenticular It is incident on the sheet 54. This lenticular sheet 54 is a lenticular lens part. 54a and 54b extend vertically (up and down). Therefore, the incident light is horizontal (left It will be diffused in the right direction.

[0020]   Thus, according to the present embodiment, the action of the lenticular sheets 12 and 54 causes Thus, the incident light is diffused vertically and horizontally. Therefore, horizontal and vertical The light diffusion directional characteristics in both directions are as shown in the graph GA of FIG. Even if θ becomes large, the brightness does not decrease so much. Therefore, the viewer 62 (see FIG. 3) (Light) moves your gaze to the left or right, or when you look at the screen diagonally from above and below, The change in Rusa is small.

[0021]   In addition, in the present embodiment, the black strap is provided on both of the lenticular sheets 12 and 54. Ips 14, 58 are provided. For this reason, only the lenticular sheet 54 is blocked. Compared with the case where the rack stripe 58 is provided, the screen contrast is The layer is improved, and a screen strong against external light is obtained.

[0022]   Further, according to this embodiment, the black stripes 14 of the lenticular sheet 12 are In this part, since the lenticular sheets 12 and 54 are integrated by adhesion, The rigidity of the entire structure is increased. Therefore, in order to project high resolution images , Lenticular lens portions 12a, 12b, 54 of the lenticular sheets 12, 54 Even if the pitch of a and 54b is made small or the sheet thickness is made thin, the rigidity is insufficient. Deformation such as bending does not occur, and a good image without distortion can be obtained. Wear. Also, due to the integral formation by such adhesion, environmental changes such as temperature and humidity can be reduced. The two lenticular sheets 12, 54 are separated due to environmental changes. However, there is no fear that the projected image becomes a double image and the image quality is deteriorated.

[0023] <Example 2>   Next, a second embodiment of the present invention will be described with reference to FIG. This example Then, the structure of the transmissive screen is the same as that of Example 1, but the cross-sectional shape is different. It The cross section is a direction orthogonal to the black stripes 14 and 58.   In the figure, the back side of the lenticular sheet 20 is formed flat. The front side is provided with lenticular lens portions 20a continuously at an appropriate pitch. There is. A V-shaped groove 22 is formed between these lenticular lens portions 20a. Is made. First, the surface of the V-shaped groove 22 has a low refractive index such as a fluorine compound. The substance is applied. After that, black paint is applied on it and black stripes 24 is formed.

[0024]   According to the lenticular sheet 20 configured as above, the lens portion is provided on the back side. Since it is not formed, the incident light goes straight on. Of these, the V-shaped groove 22 The light incident on is totally reflected by the slope of the V-shaped groove 22 as shown by the arrow FD in the figure. The light is obliquely emitted from the front lenticular lens portion 20a. Therefore, The light diffusion directional characteristics can be further improved.

[0025] <Other Examples>   The present invention is not limited to the above embodiment. For example, above In the embodiment, both the lenticular sheets 12 and 54 have black stripes 14, Although 58 is provided, it may be provided on only one of them. In addition, two records If the sheet thickness of the antistatic sheets 12, 54 has sufficient rigidity for holding, The two do not necessarily have to be integrated by bonding. Further, in the above embodiment, the lens The layout is such that the lens parts of the chicular sheets 12 and 54 are in the horizontal and vertical directions, respectively. However, the same effect can be obtained by arranging them so that they are substantially orthogonal to each other.

[0026]

[Effect of device]

  As described above, according to the transmissive screen according to the present invention, two wrenches are used. Since we decided to stack the curular sheets so that the lens parts are orthogonal to each other, Light is diffused in any of the top, bottom, left, and right directions of the screen. Also, the change in screen brightness with respect to the viewing angle is reduced and good light diffusion directional characteristics are obtained. There is an effect that is.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a transmissive screen according to the present invention.

FIG. 2 is a sectional view of a main part showing a second embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a conventional transmissive screen.

FIG. 4 is a graph showing a light diffusion directional characteristic of a conventional transmission screen.

[Explanation of symbols]

10 ... Transmission type screen, 12, 20, 54 ... Lenticular sheet, 12a, 12b, 20a, 54a, 54b
... Lenticular lens portion, 14, 24, 58 ... Black stripe, 22 ... V-shaped groove, 52 ... Fresnel lens sheet, 62 ... Viewer, FA, FB, FC, FD ... Arrow, G
A, GB ... Graph.

Claims (2)

[Scope of utility model registration request] 1. A transmissive screen in which a lenticular sheet is arranged on the front side of a Fresnel lens sheet, wherein two lenticular sheets are arranged so that the lenticular lens portions are orthogonal to each other, and at least one of these lenticular sheets is arranged. A transmissive screen comprising a lenticular lens portion and a black stripe formed in parallel therewith. 2. The transmission screen according to claim 1, wherein a V-shaped groove is formed between the lenticular lens portions of at least one of the lenticular sheets.