JP2013120206A - Method for manufacturing passive type 3d projection screen and passive type 3d projection screen manufactured thereby - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of easily and inexpensively manufacturing passive type 3D projector screens that can suppress a crosstalk rate to low, have a wide view angle, retain the brightness and be appreciated by a large number of persons.SOLUTION: The surface of a screen substrate is embossed to be formed into an asperity surface, and a reflective coat is applied and formed on the asperity surface. Especially, the substrate having the asperity surface by embossing is a projection screen substrate usable as a 2D diffusion type projection screen, and the reflective coat is applied and formed on the asperity surface of the projection screen substrate. The projection screen manufactured by the manufacturing method has the surface of the coat-formed reflective coat that has undulation reflecting the asperity surface of the embossing.

Description

  The present invention relates to a projection screen for a passive 3D that can obtain a relatively large half gain angle while maintaining the 3D characteristics and can be used for a large number of viewing.

  There are roughly two types of 3D methods for providing stereoscopic images using a projector such as a projector and a projection screen: a passive method (polarization filter method) and an active method (liquid crystal shutter method). The passive method is a method in which right-eye and left-eye images are simultaneously projected from different projectors onto a projection screen, and are received by polarized glasses with a polarizing filter. The image projected on the projection screen is a state where the image for the right eye and the image for the left eye are overlapped, and the images for the right eye and the left eye are perceived through the right and left polarizing filters of the polarizing glasses. Can be recognized as a stereoscopic image.

  When a general 2D projection screen is used as such a passive projection screen, the light is diffused and reflected by the diffusion layer on the surface, and the polarization property is destroyed. A scene enters and cannot be recognized as a 3D image as a crosstalk (double image). Therefore, conventionally, 3D projection screens are generally used in which a reflective surface is formed by applying silver on the surface of a smooth white sheet such as PVC. According to such a conventional 3D projection screen, the right eye image and the left eye image projected by the two projectors are reflected on the polarized glasses without diffusing, and the crosstalk rate (quenching) Ratio) can be suppressed to about 0.4%.

  However, when the surface approaches the mirror surface, the crosstalk rate is improved, but on the other hand, the half gain angle (viewing angle) tends to be narrowed. When this half gain angle is narrowed, 3D images can only be enjoyed at the center of the screen, making it unsuitable for many viewing. On the other hand, it has been proposed that a 3D projection screen is provided with a diffusion layer in which minute light diffusing particles are dispersed or an uneven shape is provided on the surface, thereby adjusting the viewing angle (see, for example, Patent Document 1). ). However, if such a diffusion layer is separately formed on the surface of the formed reflection surface, the reflection efficiency decreases and the brightness decreases, and it is difficult to provide the diffusion layer while maintaining the quality of the reflection surface. It also causes an increase.

JP 2008-3172 A

  Therefore, in view of the above situation, the present invention intends to solve the passive system 3D that can keep the crosstalk rate low, have a wide viewing angle, can maintain brightness, and can be viewed in large numbers. It is the point which provides the technology which can manufacture the projector projection screen for homes easily and at low cost.

  In order to solve the above-mentioned problems, the present invention is a passive method 3D characterized by forming an uneven surface by embossing the surface of a screen fabric and applying a reflective film on the uneven surface. Provided is a method for manufacturing a projection screen.

  Here, the cloth having an uneven surface by the embossing is a projection screen cloth that can be used as a diffusion projection screen for 2D, and the reflective film is applied and formed on the uneven surface of the projection screen cloth. Is preferred.

  The present invention also provides a projection screen produced by the above-described manufacturing method, wherein the surface of the reflective film formed by coating has a undulation reflecting the uneven surface of the embossing. provide.

  According to the present invention, a passive 3D projection screen is manufactured which can increase the half gain angle as compared with the conventional one while keeping the crosstalk rate low and maintaining the brightness, and thus can be viewed in large numbers. be able to. And since the manufacturing method performs embossing on the surface of the screen fabric to form a concavo-convex surface, a reflective film is applied and formed on the concavo-convex surface, so that the passive film having the above-mentioned reflective film having good optical characteristics is used. The 3D projection screen can be manufactured easily and with stable quality at a lower cost.

  In addition, the dough having a concavo-convex surface by embossing is a projection screen dough that can be used as a diffusion projection screen for 2D, and the reflective film is applied and formed thereon, so that the manufacturing process can be partially shared and manufactured Costs and management costs can be reduced.

  In addition, the projection screen produced by the above manufacturing method has high quality with stable optical characteristics because the surface of the reflection film formed by coating has a undulation reflecting the embossed uneven surface.

(A) is an enlarged photograph of the screen fabric surface before application of the metal paint of Example 1, and (b) is an enlarged photograph of the screen surface after application. (A) is an enlarged photograph of the screen fabric surface before application of the metal paint of Example 2, and (b) is an enlarged photograph of the screen surface after application. (A) is an enlarged photograph of the screen fabric surface before application of the metal paint of Example 3, and (b) is an enlarged photograph of the screen surface after application. (A) is an enlarged photograph of the surface of the white sheet before application of the metal paint of Comparative Example 1, and (b) is an enlarged photograph of the screen surface after application.

  Next, an embodiment of the present invention will be described.

  The projection screen for the passive system 3D of the present invention is manufactured by embossing the surface of the screen fabric to form an uneven surface, and applying a reflective film on the uneven surface. As the base screen fabric, a known material conventionally used as a screen fabric, such as a polyvinyl chloride (PVC) sheet, can be appropriately used, and the surface of the screen fabric is embossed. For embossing, use a well-known processing method to pass the embossing roll engraved with the embossing machine and the rubber crimping roll with the film surface heated and softened to give a raised pattern (unevenness pattern) to the film surface. The embossed screen becomes a fabric having an uneven surface with a three-dimensional undulation pattern.

  It is preferable that the fabric on which the uneven surface is formed by this embossing is configured as a projection screen fabric that can be used as a 2D diffusion projection screen, thereby making it possible to partially share the manufacturing process, and to reduce the manufacturing cost and the management cost. Can be reduced. In this case, for example, an uneven surface is formed by embossing on the surface of the front side of the screen fabric in which a sheet layer made of white and black vinyl chloride is formed on the front side and the back side of the glass cloth, and is configured as a reflective surface for 2D However, the present invention is not limited to this.

  The reflective film applied and formed on the concavo-convex surface can be applied with a known paint similar to a conventional passive 3D projection screen, for example, a silver metal paint containing aluminum powder can be used. . Conventionally known coating methods can also be used for the coating method. According to the present invention, the undulation reflecting the embossed uneven surface is formed, the crosstalk rate can be kept lower than the direct uneven processing, the brightness can be maintained, and the optical characteristics can be stabilized. Can do.

  Next, the results of measuring the optical characteristics of the passive 3D projection screens according to the present invention (Examples 1 to 3) and the conventional passive 3D projection screen (Comparative Example 1) will be described.

  In Examples 1 and 3, the surface of the screen cloth on which the sheet layer made of white and black vinyl chloride is formed on the front side and the back side of the glass cloth, respectively, and the surface layer surface of the screen fabric is provided with an uneven surface by embossing. Silver metal paint containing a diffusion type projection screen (OSS Co., Ltd. Screen WG207 (screen fabric of Example 1), WG103 (Screen fabric of Example 3)) as projection screen fabric and aluminum powder on the uneven surface thereof Is applied to form a reflective film. FIG. 1A is an enlarged photograph of a 5.9-7.4 mm region of the screen fabric surface before application of the metal paint of Example 1, and FIG. 1B is 5.9-7.4 mm of the screen surface after application. It is an enlarged photograph of the area. 3A is an enlarged photograph of a 5.9-7.4 mm region of the screen fabric surface before application of the metal paint of Example 3, and FIG. 3B is 5.9-7. It is an enlarged photograph of a 4 mm area. It can be seen that both have undulations reflecting the embossed uneven surface on the surface of the reflective film after application of the metal paint.

  Example 2 is a 2D diffusion projection screen (OS Co., Ltd.) in which the surface of the front side sheet layer of the screen fabric in which the sheet layer made of white vinyl chloride is formed only on the front side of the glass cloth is provided with an uneven surface by embossing. A screen WG201) is used as a projection screen fabric, and a reflective metal film is formed by applying a silver metal paint containing aluminum powder to the uneven surface. FIG. 2A is an enlarged photograph of a 5.9-7.4 mm region of the screen fabric surface before application of the metal paint of Example 2, and FIG. 2B is a 5.9-7.4 mm vertical and horizontal surface of the screen after application. It is an enlarged photograph of the area. It can be seen that the reflective film surface after the coating of the metal paint has undulations that are finer than those of Examples 1 and 3 but reflect the embossed uneven surface.

  Comparative Example 1 is a conventional conventional passive 3D projection screen in which a reflective film is formed on a smooth white sheet surface of PVC by applying a silver metal paint containing aluminum powder. The reflective films of Examples 1 to 3 and Comparative Example 1 were formed by applying the same amount of the same silver metal paint. 4A is an enlarged photograph of a 5.9-7.4 mm region on the surface of the white sheet before application of the metal paint of Comparative Example 1, and FIG. 4B is 5.9-7.4 mm of the screen surface after application. It is an enlarged photograph of the area. There is no undulation on the surface of the reflective film after the metal paint is applied.

  The brightness is 5 ° gain, a polarizing plate is inserted only into the projector, and light is applied to the screen gain (a perfect diffuser plate (pure white plate on which magnesium oxide is baked) called standard white plate) at a position shifted 5 ° left and right from the front of the screen. The ratio of the brightness of the screen fabric under the same condition when the brightness when the brightness is 1 is measured using a brightness meter. The half gain angle was also measured by measuring the angular position of the luminance meter when the luminance was half (half gain) with respect to the 5 ° gain with the polarizing plate inserted only in the projector.

  The crosstalk ratio (extinction ratio) is determined by fixing the luminance meter at a position shifted by 5 ° to the left and right from the front of the screen, inserting the polarizing plate into the projector, and attaching the polarizing plate to the luminance meter. First, set the polarizing plate so that the transmission axis is parallel to the polarizing plate of the projector, then rotate the polarizing plate to the left and right to measure the luminance at the brightest position, and then the polarizing plate on the luminance meter side Rotate left and right after setting the projector's polarizing plate and the transmission axis to be orthogonal to each other, measure the brightness at the darkest position, and calculate the ratio (%) of the brightness at the dark position to the brightness at the bright position. Calculated.

  As can be seen from the above results, in Examples 1 to 3, the brightness is slightly inferior to that of Comparative Example 1, but 2.2 or more can be secured, and in Example 1, the result of 3.11 is not inferior. Also, the crosstalk rate is suppressed to 1.1 or less, and both the brightness and the crosstalk rate maintain sufficient optical quality as a projection screen for the passive 3D system. The half gain angle has achieved a large value of 18 or more, and it can be seen that a passive 3D projection screen that can be viewed in large numbers can be provided.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various forms without departing from the gist of the present invention.

Claims (3)

  A method for producing a passive 3D projection screen, comprising: embossing a surface of a screen fabric to form an uneven surface, and applying a reflective film on the uneven surface.   The cloth having a concavo-convex surface by the embossing is a projection screen cloth usable as a diffusion projection screen for 2D, and the reflective film is applied and formed on the concavo-convex surface of the projection screen cloth. A method for producing a projection screen for passive 3D.   3. A projection screen for a passive 3D produced by the manufacturing method according to claim 1 or 2, wherein the surface of the reflection film formed by coating has a undulation reflecting the uneven surface of the embossing.