KR20060078557A - Structure for black bead screen - Google Patents

Abstract

In the present invention, a lenticular sheet structure having a black bead type capable of improving the contrast of a projection system is disclosed.

According to the present invention, in a lenticular sheet structure, a micro bead wire lens in which a plurality of micro bead wires are arranged; A black mask applied to the front side of the microbead wire lens so as not to exceed the outer circumferential surface of the microbead, to prevent light loss of an image light source and incident of a natural light source; A diffusion layer applied to the front side of the black mask to diffuse the image light source; And a lenticular lens bonded to the front surface of the diffusion layer to secure a viewing angle of the image light source. The microbead wire lens may be formed of any one of PET, polystyrene resin, acrylic resin, and polycarbonate resin, and each bead constituting the microbead wire lens has a diameter of 200 μm to 220 μm. . Therefore, when the natural light source is incident on the micro bead wire lens, the present invention does not radiate to the surrounding micro bead wire, thereby providing an effect of improving the contrast of the image light source and the resolution of the image.

Projector, Contrast, Lenticular Sheet, Micro Bead, Black Mask

Description

Lenticular sheet structure with black bead type {STRUCTURE FOR BLACK BEAD SCREEN}

1 is a block diagram showing a rear screen applied to a conventional projection system.

FIG. 2 is a partially enlarged view for explaining the lenticular sheet of FIG. 1.

3 is a perspective view showing a lenticular sheet according to the present invention.

4 is a block diagram illustrating an incident state of a natural light source and an image light source according to the present invention.

<Description of the code | symbol about a main drawing>

300: lenticular sheet 301: micro bead wire lens

303: black mask 305: diffusion layer

307 lenticular lens 401 Fresnel lens

The present invention relates to a lenticular lens applied to a projection television, and more particularly, to implement a microlens in a bead structure to minimize the projection distance, increase the application rate of the black mask to increase the A lenticular sheet structure having a black bead type capable of increasing contrast and resolution by minimizing extinction and interference.

In general, projection TV is to enlarge the projected image from projection engines such as CRT, LCD, DLP, LCOS so that the viewer can see near and far from far away. The rear type and front type Are divided into two ways. The front type condenses the image displayed from the CRT through the lens of multiple stages and reflects it through the reflection mirror, and then projects the image enlarged through the lens of the multiple stages to the front of the screen for display, and the rear type is displayed from the CRT. The projected image is projected through the lens of the multi-stage, or reflected by changing the path by the mirror to project the rear of the screen through the multi-stage lens.

The rear type uses a negative black strip lenticular lens on a screen shaped using holography technology. In this case, the lenticular lens blocks non-reflective ink so as to form a black strip inwardly to block the progress of light. The lenticular lens is combined with a Fresnel lens sheet and a horizontal lenticular sheet to form a rear projection screen. That is, as shown in FIG. 1, the screen includes a Fresnel lens sheet 140 and a lenticular lens sheet 150 from the rear side.

Here, the Fresnel lens sheet 140 has a resin substrate 141, the Fresnel lens 142 is arranged on the front side. The lenticular sheet 150 has a resin substrate 151, the lenticular portion 152 is arranged on the rear side thereof, and the surface treatment layer 158 is arranged on the front side. The lenticular portion 152 is formed by arranging a plurality of cylindrical lenses extending in the vertical direction in parallel in the horizontal direction. The lenticular unit 152 is arranged to refract-diffuse the image light source in a horizontal direction.

2 is a partially enlarged view for describing the lenticular unit 152 described above in detail. First, as shown in FIG. 2A, the lenticular portion 152 is arranged with a micro lens 201 having a predetermined refractive index on the rear side. Subsequently, the microlens 201 is bonded to the transparent film 203, and then the light shielding pattern 205 is printed on the rear surface of the transparent film 203.

The light shielding pattern 205 is a printing method using a photo mask, and is commonly referred to as a black stripe. As shown, the microlens 201 is manufactured with an arc diameter of 153 mu m and an arc thickness of 62.5 mu m. The distance between the microlens 201 and the light blocking pattern 205 is maintained at a distance of 210.5 μm, and one microlens 201 and the two light blocking patterns 205 corresponding to each other have a length of 51 μm. It is composed.

Therefore, the image light source passing through the Fresnel lens sheet 140 is projected to the transparent film 203 through the micro lens 201, and then penetrates between the light blocking patterns 205. Here, the light shielding pattern 205 should secure the distance between the patterns to a predetermined value or more, which is based on the refractive index of the microlens 201 and the thickness of the transparent film 203 corresponding thereto. Is determined.                         

For example, when the refractive index of the commonly used micro lens 201 is 1.49 degrees or less, and the thickness of the transparent film 203 is designed to be 210.5 μm, the light blocking pattern 205, that is, the black mask is 1: It has a pattern ratio of two. Therefore, after natural light is incident between the light shielding patterns 205 as shown in FIG. 2B, light source reflection is performed on the inner surface of the microlens 201.

Thus, the natural light source incident between the above-described light blocking patterns 205 is reflected from the micro lens 201 and is radiated into the transparent film 203 to reduce the transmittance of the image light source. This lowers the brightness and contrast of the output image of the projection system, causing a problem of degrading the image quality of the image.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a lenticular sheet structure having a black bead type that can increase the brightness and contrast of an image light source by preventing natural light from being incident on the lenticular sheet. Is in.

Another object of the present invention is to increase the refractive index of the microlens constituting the lenticular sheet to narrow the light source projection distance by the microlens in the lenticular sheet, thereby reducing the thickness of the lenticular sheet. In providing a structure.

Still another object of the present invention is to provide a lenticular sheet structure having a black bead type that increases the masking ratio of the light shielding pattern applied to the front side of the lenticular sheet, thereby facilitating the production of the lenticular sheet.

A lenticular sheet structure having a black bead type according to an aspect of the present invention for achieving the above object, in the lenticular (Lenticular) sheet structure, a micro bead wire lens (Micro Bead Wire) is arranged; A black mask applied to the front side of the microbead wire lens so as not to exceed an outer circumferential surface of the microbead to prevent light loss of an image light source and incident of a natural light source; A diffusion layer applied to the front side of the black mask to diffuse an image light source; And a lenticular lens bonded to the front surface of the diffusion layer to secure a viewing angle of an image light source.

According to a preferred embodiment of the present invention, the lenticular lens has a thickness of 0.5mm to 3mm, 75% to 95% total light transmittance, 0% to 40% diffusion transmittance, and a haze value of 0 to 50. It is characterized by having.

In addition, the lenticular lens has a low reflection process by stacking materials having different refractive indices to suppress incident light of natural light, increase brightness of an output image, and apply tin oxide to the front side of the lenticular lens to adsorb foreign substances by static electricity. It is characterized in that the coating using a UV-curable paint to prevent traces caused by external physical contact.

In addition, the black mask is characterized in that to form a non-shielding portion corresponding to the position of the light collected from the microbead.                     

In addition, the micro-bead wire lens is any one material of PET, polystyrene resin, acrylic resin, polycarbonate resin, and each bead (Bead) constituting the microbead wire lens has a diameter of 150㎛ ~ 220㎛ It is characterized by having.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a perspective view for explaining a lenticular sheet having a black bead type according to the present invention. As shown in the drawing, a micro bead wire lens 301 is arranged with a plurality of micro bead wires, and is applied to the front side of the micro bead wire lens 301 so as not to exceed the outer peripheral surface of the micro bead And a black mask (303) for preventing light loss of the image light source and the incidence of natural light, a diffusion layer 305 for diffusing the image light source by being applied to the front side of the black mask 303, and the diffusion layer. It is composed of a lenticular lens 307 bonded to the front surface of the 305 to secure the viewing angle of the image light source.

The front side described above defines the projection side of the image light source, and the rear side defines the observation side of the image light source.

The diffusion layer 305 has a thickness of 0.05 mm to 0.3 mm, the lenticular lens 307 has a thickness of 0.5 mm to 3 mm, 75% to 95% preferably 95% total light transmittance, 0% to It is designed to have a diffusion transmittance of 40% preferably 0% and a haze value of 0-50 preferably 0. The diffusion layer 305 is bonded by a predetermined adhesive layer applied to the front side of the black mask 303.

The diffusion layer 305 includes a light diffusing agent and a dark colorant in order to refractively diffuse an image light source in a vertical direction and to increase contrast. The light diffusing agent and the colorant decrease the screen brightness in proportion to the amount of the addition, the refractive diffusion effect on the image light source in the vertical direction is insufficient, and the vertical viewing angle of the screen is narrowed, so that an appropriate amount is added to obtain the addition effect. Needs to be.

The lenticular lens 307 is made of a material having excellent rigidity and light transmittance such as styrene resin, acrylic resin, acrylic-styrene copolymer resin, polycarbonate resin, and the like. The front side of the lenticular lens 307 is a surface treatment for antireflection, antistatic, hard coat, and the like. The anti-reflection can be made of a low reflection treatment by stacking materials having different refractive indices, thereby suppressing the incident of natural light and increasing the brightness of the output image. The antistatic is applied to the front side of the lenticular lens 307 to prevent the adsorption of foreign matter by static electricity. The hard coat is a UV-curable paint to prevent the traces caused by external physical contact.

The black mask 303 forms a non-shielding portion corresponding to the position of the light collected from the microbeads. The diameter of the non-shielding portion may be reduced by increasing the refractive index of the micro bead wire lens 301. In the manufacturing process of the black mask 303, the ionizing radiation curable resin layer is formed on the front side of the microbead wire lens 301, and then the resin layer is cured corresponding to the position of light collected from each bead. That is, the ionizing radiation is projected from the rear side of the microbead wire lens 301 to cure the resin layer formed on the front side of the microbead wire lens 301, and the resin layer is as large as the light condensed by the refractive index of each bead. Harden. Thus, the resin layer is separated into an uncured portion and a cured portion.

And a black colored layer is apply | coated to the front side of the said resin layer, and a transfer sheet is affixed on this upper surface. The colored layer is adsorbed into the cured portion. The resin layer and the colored layer of the uncured portion are separated upon detachment of the transfer sheet. Through this process, the black mask 303 is formed.

Each bead constituting the microbead wire lens 301 may be manufactured to have a diameter of 150 μm to 220 μm. As the micro bead wire lens 301, PET, polystyrene resin, acrylic resin, polycarbonate resin, or the like is used.

The resin described above for producing the microbead wire lens 301 is pressed using a mold in a flat press in a hot melt state. Flat press presses the front and back of the resin at the same time. Here, the mold is an emboss roll mold, and the resin is extruded by melt extrusion molding by a compressor. That is, the resin is supplied between two emboss roll molds having the same shape to generate a plurality of microbeads on the front and back of the resin.

If necessary, the micro-bead wire lens 301 may be an ultraviolet or electron beam curable resin, and at this time, by supplying a resin between the two emboss roll mold to form a lens sheet so that both sides have an embossed shape. The microbead wire lens 301 may be provided by curing the lens sheet using ultraviolet rays or electron beams.

In the lenticular sheet 300 configured as described above, as shown in FIG. 4, the image light source a provided from the projector is incident on the lenticular sheet 300 via the Fresnel lens sheet 401. The image light source a is incident to the micro bead wire lens 301. The microbead wire lens 301 has a short throw distance of the light source due to the high refractive index, and based on this, the condensing position of the image light source a is set to be close to the front side of the microbead wire lens 301. Therefore, the condensing area of the image light source a by each bead is narrow, the condensing area is unshielded with respect to the natural light source, and all parts except the condensing area are shielded with respect to the natural light source.

The non-shielding portion and the shielding portion are assumed to be the black mask 303 described above, and the image light source a is transmitted to the non-shielding portion of the black mask 303 via the micro bead wire lens 301. The image light source a penetrating the black mask 303 is radiated to the diffusion layer 305, and the diffusion layer 305 diffuses the image light source a to generate an image image.

On the other hand, the proportion of the black mask 303 with respect to the non-shielding portion is minimal compared to the shielding portion. Therefore, when the natural light source b incident from the front side of the lenticular sheet 300 is incident on the micro bead wire, the natural light bead does not radiate to the surrounding micro bead wire. As a result, the microbead wire lens 301 easily transmits the image light source (a) incident from the rear side to the observation side, while not accepting the natural light source (b) provided from the observation side. Improve contrast.

As described above, the lenticular sheet structure having the black bead type according to the present invention includes a microbead wire lens in which a plurality of beads having a high refractive index of a predetermined size are arranged, and the front of the microbead wire lens After applying the black mask to the side, and then attaching the diffusion layer and the lenticular lens to the front of the black mask sequentially to produce a lenticular sheet, when the natural light source incident from the observation side is incident on the microbead wire lens, the peripheral microbead wire As it is not radiated to, it provides an effect of improving the contrast and resolution of the image light source provided at the rear side of the micro bead wire lens.

In addition, compared to the light shielding pattern of the conventional black stripe (Black Stripe) screen, it is easy to manufacture the black mask applied in the present invention has the effect of reducing the production cost.

Claims (7)

In the lenticular sheet structure, A micro bead wire lens 301 in which a plurality of micro bead wires are arranged; A black mask (303) applied to the front side of the microbead wire lens 301 so as not to exceed an outer circumferential surface of the microbead to prevent light loss of an image light source and incident of a natural light source; A diffusion layer 305 applied to the front side of the black mask 303 to diffuse an image light source; And A lenticular sheet structure having a black bead type, comprising a lenticular lens 307 bonded to the front surface of the diffusion layer 305 to secure a viewing angle of an image light source. The lenticular lens 307 has a thickness of 0.5 mm to 3 mm, a total light transmittance of 75% to 95%, a diffusion transmittance of 0% to 40%, and a haze value of 0 to 50. A lenticular sheet structure having a black bead type, characterized in that it has a. The lenticular sheet structure of claim 2, wherein the lenticular lens (307) is made of any one of a styrene resin, an acrylic resin, an acrylic-styrene copolymer resin, and a polycarbonate resin. 2. The lenticular lens 307 according to claim 1, wherein the lenticular lens 307 is laminated with materials having different refractive indices to suppress the reflection of natural light, increase the brightness of the output image, and oxidize the front side of the lenticular lens 307. A lenticular sheet structure having a black bead type, which is coated with tin to prevent adsorption of foreign substances by static electricity and is coated so that traces due to external physical contact are not generated using an ultraviolet curable paint. The lenticular sheet structure of claim 1, wherein the diffusion layer (305) includes a light diffusing agent and a dark colorant in order to refractively diffuse an image light source in a vertical direction and to increase contrast. The lenticular sheet structure according to claim 1, wherein the black mask (303) forms a non-shielding portion corresponding to the position of the light collected from the microbeads. The method of claim 1, wherein the micro-bead wire lens 301 is made of any one material of PET, polystyrene resin, acrylic resin, polycarbonate resin, each bead (Bead) constituting the micro-bead wire lens 301 ) Is a lenticular sheet structure having a black bead type, characterized in that having a diameter of 150㎛ 220㎛.

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