KR100636057B1 - Plastic optical fiber display screen and manufacturing method thereof - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber display screen and a method of manufacturing the same. More particularly, the present invention relates to an optical fiber display screen capable of minimizing the loss of the projected image and realizing high-definition, high-brightness, low power consumption precision images. In order to achieve this, the present invention, the first step of manufacturing a fiber sheet by fixed array of optical fibers at a predetermined interval; Stacking the optical fiber sheets, bonding the laminated optical fiber sheets to each other by applying an adhesive, and cutting the second optical fiber sheet; A third step of cutting the optical fiber block to a predetermined thickness so that a cross section of the optical fiber appears to form an optical fiber display plate; Polishing a cut surface of the optical fiber display plate; And a fifth step of manufacturing the optical fiber display screen by fixedly arranging the polished optical fiber display panel to be adjacent in the lateral direction.

Screen, Rear Projection, Fiber Optic, Weaving, Adhesive, Winding, Wet Grinding, Fiber Sheet, Fiber Block, Frame

Description

Optical fiber display screen and manufacturing method thereof

1 is a view showing an embodiment of a conventional display screen,

2 is a view showing another embodiment of a conventional display screen;

3A and 3B are cross-sectional and front views showing yet another embodiment of a conventional display screen;

4 is a block diagram showing an embodiment of a method of manufacturing an optical fiber display screen according to the present invention;

5A is a perspective view of an optical fiber woven sheet of the present invention;

5B is a cross-sectional view showing a single-core optical fiber and a multi-core optical fiber of the present invention;

6 is a view showing the sequence of the winding process of the present invention,

Figure 7a is a view illustrating the adhesive coating and winding process of the present invention,

7b is a perspective view of a rotating frame of the present invention,

Figure 7c is a perspective view showing a cutting process of the laminated optical fiber sheet of the present invention,

8A is a perspective view illustrating a cutting process of an optical fiber block according to the present invention;

8B is an enlarged view of the cut surface of FIG. 8A, FIG.

8C is a perspective view of an optical fiber display plate of the present invention;

9 is a perspective view showing a polishing process of the present invention,

10A is a perspective view showing one embodiment of an optical fiber display screen according to the present invention;

10B illustrates another embodiment of an optical fiber display screen according to the present invention;

10c illustrates another embodiment of an optical fiber display screen according to the present invention;

11 is a cross-sectional view illustrating the operation of the optical fiber display screen according to the present invention;

12 is a view showing another embodiment of manufacturing the optical fiber block of the present invention;

13 is a view showing another embodiment of manufacturing the optical fiber block of the present invention;

14 is a block diagram showing another embodiment of the method of manufacturing the optical fiber display screen according to the present invention;

FIG. 15 is a perspective view illustrating one step of FIG. 14.

<Description of the symbols for the main parts of the drawings>

100a: optical fiber 100b: chemical fiber (cotton yarn)

101: optical fiber core 102: optical fiber clad

110: winding machine 120: applicator

130: adhesive 140: strength reinforcing sheet

150: diamond cutter 200: optical fiber sheet

210: beam 220: rotating frame

230: press 300: optical fiber block

310: diamond cutting machine 400: optical fiber display plate

405: engraved 410: diamond polisher

420: flat panel 430: screen reinforcement frame

440: plate frame 500: optical fiber display screen

Generally, a display device is a device that visually expresses data in the form of characters or figures on a screen, and the types thereof include a CRT, a liquid crystal display panel, a plasma display panel, an EL (Electro Luminescent) panel, an LED display panel, a projection method, and the like. There is this. However, large displays such as indoor and outdoor video billboards and movie theater screens are mainly used for LED display panels and projection displays due to problems such as high price and high power consumption due to large size.

The LED signboard is a device that displays images by installing more than a million LED lamps on the panel, and blinks these lamps individually, and has the advantage of realizing a large image of high brightness, but it is expensive, has low resolution, and consumes power. Has the disadvantage of being very large.

On the other hand, the projection type display is a display method that realizes an image by projecting the image projected from the projector onto the screen. The front projection method that reflects the projected image on the screen and the projector is located behind the screen The projected image can be divided into a rear projection method that transmits through a screen, and it is advantageous in that it is inexpensive and consumes much less power than an LED display.

Among these, in the case of the front projection method, since the projector is exposed to the external environment, the image quality is easily degraded by the influence of the external environment, and there is a disadvantage that the loss of the image and the interference by the ambient light are also severe. In particular, conventional front-projection screens typically use white textile or coated fabrics. These textile screens simply serve to reflect and scatter light output from the projector. There are disadvantages.

On the other hand, in the case of the rear projection method, since the projector may be installed inside the display device, an image may be efficiently implemented without influence of an external environment, loss of an image, and interference by external light.

However, the conventional rear projection screen, as shown in Figure 1, a conventional projection screen of the acrylic or polycarbonate material of the combination of Fresnel lens 5 and the lenticular lens 6 combined form It consists of (4). Such a conventional rear projection screen realizes an image using a principle in which light 3 projected from the projector 2 from the rear is scattered in the process of passing through the translucent screen 4, so that image quality is not clear. However, due to the loss of light due to scattering, the brightness is very low, which can not be used for outdoor use during the day.

Projection screen for solving such a problem is published in Korean Utility Model Publication No. 0259941, which is shown in Figure 2, between the plurality of wefts (50a) and the warp (50b) constituting the fabric paper 50 Each of the plurality of optical fibers 10a is inserted into the fabric paper 50 into which the optical fiber 10a is inserted, or coated or coated with a transparent or translucent flexible synthetic resin body 52, and one side of the textile paper 50 The polarizing film 53 is attached to the configuration. However, in the projection screen of the above structure, it is difficult to transmit a clear image because the synthetic resin 52 is attached to one surface of the optical fiber 10a, and the coupling of the optical fiber 10a serving as the pixel is not firm, so that the pixel defect and the image are poor. There was a problem of causing distortion. In addition, due to the lack of efficiency of the process of inserting the optical fiber 10a between the weft 50a and the warp 50b, the manufacturing cost is increased, and the phase of each optical fiber is changed for a long time, which makes it difficult to accurately transfer the image. .

In addition, another type of rear projection screen is disclosed in Korean Utility Model Publication No. 0305229 to solve the problems of the conventional rear projection screen. That is, as shown in the cross-sectional view of Figure 3a, weaving the fibers to have a structure as shown in Figure 3b to diffuse the image projected from the projector in the weft and oblique direction, the fiber gap of the woven diffusion sheet 60 Is filled with a transparent thermoplastic resin, and a transmissive sheet 61 forming a transmissive layer between the weft and the warp fibers, and a light condensing sheet 62 laminated on the incident light side with respect to the diffusion sheet 60 and the transmissive sheet 61. ), The semi-permeable membrane sheet 63 stacked on the output light side to diffuse and spread the image diffused or transmitted in the weft and oblique directions to the whole screen, blocking the diffuse reflection in the direction of the viewer in the image formed on the semi-permeable membrane sheet 63 And a black mark 64 to increase the contrast ratio of the image. The screen has an advantage that the brightness of the image is higher, the viewing angle is wider, and the contrast ratio of the image is increased by the black mark 64, compared to the screen of the conventional polycarbonate or acrylic resin, Not only using the transparent properties of the optical fiber, but also using the fiber and semi-permeable membrane 63, it is difficult to deliver a clear image because of the scattered image, and the brightness is low for outdoor use during the day There was a downside.

Accordingly, an object of the present invention is to improve the problem of a conventional rear projection screen, and to efficiently transmit images projected by various types of optical imaging devices such as projectors without loss, thereby improving precision images of high definition, high brightness, and low power consumption. It is to provide an optical fiber display screen and a method of manufacturing the screen to enable the implementation.

In order to achieve the above object, in the present invention, a first step of manufacturing an optical fiber sheet by fixed array of optical fibers at a predetermined interval; Stacking the optical fiber sheets, bonding the laminated optical fiber sheets to each other by applying an adhesive, and cutting the second optical fiber sheet; A third step of cutting the optical fiber block to a predetermined thickness so that a cross section of the optical fiber appears to form an optical fiber display plate; Polishing a cut surface of the optical fiber display plate; A method of manufacturing an optical fiber display screen is provided, comprising a fifth step of manufacturing the optical fiber display screen by adhesively arranging the polished optical fiber display panel to be adjacent to each other in the lateral direction.

In addition, in order to achieve the above object, in the present invention, by applying an adhesive to a plurality of optical fibers arranged side by side, the merging step of manufacturing an optical fiber block by winding on a rotating frame (the first step and the second step Combined in steps, as follows); A third step of cutting the optical fiber block to a predetermined thickness so that a cross section of the optical fiber appears to form an optical fiber display plate; Polishing a cut surface of the optical fiber display plate; A method of manufacturing an optical fiber display screen is provided, comprising a fifth step of manufacturing the optical fiber display screen by bonding, fixing, and arranging the polished optical fiber display plate to the side in the up, down, left, and right directions.

In addition, in order to achieve the above object, in the present invention, a plurality of optical fiber display plate is formed by being fixedly arranged so as to neighbor in the vertical and horizontal directions, the optical fiber display plate, both ends of each optical fiber is A plurality of optical fibers which form the front and rear surfaces of the optical fiber display panel, and the optical fibers are stacked and arranged; It occupies the space between the plurality of optical fibers to form a front and rear surface of the optical fiber display panel together with the plurality of optical fibers, and provides an optical fiber display screen comprising an adhesive for fixing and supporting the plurality of optical fibers.

First Embodiment

According to a first embodiment of the method of manufacturing an optical fiber display screen according to the present invention, as shown in FIG. 4, a first step of manufacturing an optical fiber sheet by weaving an optical fiber, or winding and bonding and cutting the optical fiber sheet, an optical fiber A second step of manufacturing the optical fiber block by winding, bonding and cutting the sheet continuously to the rotating plate frame, and cutting the cross section of the optical fiber block to a predetermined thickness to form an optical fiber display plate having a continuous optical fiber cross section on the cut surface. A third step of polishing the cut surface of the optical fiber display plate, and a fifth step of joining the optical fiber display plate in a direction perpendicular to the optical fiber axis to produce an optical fiber display screen of a desired size.

The first step is performed by an alternative method of manufacturing the optical fiber sheet by weaving the optical fiber or manufacturing the optical fiber sheet by winding, bonding and cutting the optical fiber. Compared to the other two methods, the focused optical fibers can have a regular arrangement, and in particular, the productivity and the robustness of the manufactured sheet are excellent in converging the optical fibers to produce a large sheet. It has an advantage.

First, a method of manufacturing an optical fiber sheet by weaving an optical fiber as a first step is as follows. That is, as shown in Figure 5a, the optical fiber 100a having a diameter of 0.05mm ~ 1.00mm, either of the weft or warp, the chemical fiber (100b) having a fineness of 20 to 10,000 denier or 1 to 225 British cotton yarn number Using the cotton yarn (100b) having the other of the weft or inclined, by using a conventional textile weaving machine to make a high-density weave in a plain weave fabricated fiber sheet 200. At this time, the chemical fiber or cotton yarn serves as a support for fixing the optical fibers in place. Here, 1 denier is an expression showing the thickness of the fiber when the mass of the chemical fiber having a length of 9000 m 1g, 1 British cotton yarn number when the cotton yarn of 840 yards produced a cotton yarn based on 1 pound of cotton An expression representing. When the diameter of the optical fiber 100a used at this time is less than 0.05 mm, the workability is not good because the optical fiber is too thin. In addition, each optical fiber 100a serves as each pixel in the final screen product. When the diameter of the optical fiber 100a used exceeds 1.00 mm, the size of the pixel becomes too large due to the large diameter, so that Not suitable for implementation When weaving, 25 to 70% of the unit length is woven at the density filled with the optical fiber 100a so that the density of the optical fiber used as the weft or warp yarn is maximum, and the diameter and weaving of the remaining chemical fiber or cotton yarn 100b. Density is adjusted in the density range that can be woven according to the diameter and density of the optical fiber (100a). For example, when weaving a 0.10mm diameter fiber as a weft, weaving 25 to 70 wefts per cm and weaving 10 to 28 wefts per cm when weaving a 0.25mm diameter fiber as a weft. do. At this time, it is also good to weave the warp and warp by weaving two to five variations of plain weave.

At this time, the optical fiber 100a uses a plastic optical fiber composed of a core 101 made of high-purity acrylic polymer (PMMA: Polymethyl methacrylate) and a clad 102 made of F-polymer (Fluorinated Polymer). Either a single-core optical fiber having only one core per strand or a multi-core optical fiber having several cores may be used. The left figure of FIG. 5B shows a single-core optical fiber and the right figure shows a multi-core optical fiber. The multicore optical fiber consists of a plurality of optical fiber cores 101 and an optical fiber clad 102 which is a substrate surrounding the optical fiber core.

The chemical fiber 100b is selected from nylon yarn, polyethylene terephthalate yarn, polypropylene yarn and polyethylene yarn.

Weaving is preferably carried out using a Repia self-made fiber weaving machine.As the fiber has a low tensile strength and elongation unlike ordinary fibers, the weft of the weaving yarn is broken in the carrier part of the fiber weaving machine when weaving using the fiber as the weft. Is generated, the weaving speed is preferably 50 to 300 rpm, more preferably weaving is performed at a weaving speed of 100 to 200 rpm. If the weaving speed is less than 50 rpm, the productivity of the process for manufacturing the optical fiber sheet 200 is too low, which is not suitable. When the weaving speed exceeds 300 rpm, the weft yarn, which is an optical fiber, is broken due to too high pressure from the carrier. This happens. In addition, when weaving using an optical fiber as a warp, weaving is preferably performed at a weaving speed of 50 to 300 rpm, more preferably weaving at a weaving speed of 100 to 200 rpm. In this case, when the weaving speed is less than 50 rpm, the productivity of the process of manufacturing the optical fiber sheet 200 is too low, which is not suitable. When the weaving speed exceeds 300 rpm, the low tensile strength of the optical fiber as described above and Due to elongation, there is a problem that the inclination is broken due to the friction of the body needle and the stress when entering the chemical fiber yarn or cotton weft yarn.

Next, a method of manufacturing an optical fiber sheet by winding, bonding and cutting the optical fiber as the first step will be described below. That is, as shown in Figure 6, the optical fiber sheet 200 is manufactured by focusing the optical fiber 100a having a diameter of 0.05 ~ 1.00mm through a winding operation. Even at this time, when the diameter of the optical fiber 100a is less than 0.05 mm, the workability is not good because the optical fiber is too thin. In addition, each optical fiber 100a functions as a pixel in the final screen product. When the diameter of the optical fiber 100a used exceeds 1.00 mm, the size of the pixel becomes too large due to the thick diameter, so that the image of the high resolution image Not suitable for implementing

Referring to this process, first the optical fiber 100a by rotating the winding machine 110 in a state in which one end of the optical fiber 100a is fixed to one side in the width direction of the winding machine 110 while slowly reciprocating the optical fiber 100a. Winding up to 1 to 20 layers, and when the winding is completed, the other end of the optical fiber is fixed to the other side in the width direction of the winding machine 110. At this time, the winding speed is to be in the range of 1 ~ 20m / s, the optical fiber 100a to maintain a constant tension during the winding operation, and the optical fiber 100a is wound so as to be in close contact with each other without overlapping each other. At this time, if the winding speed is less than 1m / s, the productivity of the winding process is too low to be suitable, if the winding speed exceeds 20m / s due to the fast winding speed and the pressure increase on the optical fiber 100a Trimming is likely to occur. In order to increase the efficiency of the process of manufacturing the optical fiber sheet 200 in the winding of the optical fiber is to manufacture a sheet having a multi-layer structure of 1 to 20 layers, in this case if the winding 20 or more layers of the optical fiber sheet 200 It is difficult to maintain the layer structure within.

At this time, the optical fiber 100a wound on the winding machine 110 may sufficiently withstand an external impact due to being integrally extended and wound in the circumferential direction of the winding machine 110, but the width direction of the winding machine 110 may be increased. Since it consists of only a configuration that is in close contact between the optical fiber (100a), in order to improve the width direction strength of the optical fiber sheet 200 to be bonded to each other with the adhesive 130. The adhesive 130 is made of an improved epoxy-based adhesive, and when the winding machine 110 rotates, the optical fiber 100a passes through the adhesive applicator 120 that is transferred in the width direction from one end of the winding machine 110. While winding, apply the adhesive to the optical fiber. When the epoxy-based adhesive is cured, heat of curing is generated to increase the temperature of the adhesive site. At this time, if the curing temperature due to the curing heat generated during the adhesion exceeds 85 ℃ may damage the optical fiber, if the time required for curing is more than 24 hours, productivity is too low, which is not desirable, so to the general epoxy-based adhesive It is preferable to use an adhesive having a very low curing temperature and a short curing time and good shape stability after curing. In other words, the lower the curing temperature and the curing time, the better. For example, in the present embodiment, an epoxy AF (tentative name) product using a bisphenol A type epoxy and a diaminodiphenylmethane curing agent which has a lower curing temperature than a general epoxy adhesive is used as an adhesive satisfying the above conditions. use. The epoxy AF is used to mix so that the equivalent ratio between the epoxy and the curing agent is 1: 1. In addition, in the final product optical fiber display screen, the epoxy component contains a carbon component so that an adhesive portion other than the optical fiber can serve as a black mark.

Here, the curing temperature according to the curing time during curing of the epoxy AF was measured and compared with the general adhesive. Epoxy AF used in this measurement was a product in which a curing agent of bisphenol A type epoxy and diaminodiphenylmethane was mixed in an equivalent ratio of 1: 1, and a product containing a carbon component was used to produce a black mark effect. As a general adhesive, bisphenol F type epoxy and an amine hardener were mixed and used so that an equivalence ratio might be 1: 1.

The comparative measurement results are shown in Table 1 below.

As shown in Table 1, the general adhesive is not suitable for use with optical fibers having a glass transition temperature of about 110 ℃ because the curing temperature increases to 140 ℃. In contrast, the epoxy AF used in the present invention can be found to be much more suitable for use with the optical fiber since the curing temperature does not rise only up to 56 ° C.

Strength reinforcing sheet 140 of the type surrounding the entire layer of the wound optical fiber (100a) to prevent the slip occurs by separating the interlayer of the optical fiber (100a) to which the adhesive 130 is applied in the width direction of the winding machine (110) ) May be inserted between the layers of the optical fiber 100a.

The strength reinforcing sheet 140 is a plain weave of a chemical fiber (100b) having a fineness of 20 ~ 10,000 denier or a cotton yarn (100b) having a 1 ~ 225 British cotton yarn number inclined with the weft yarn. The chemical fiber used at this time is selected from nylon yarn, polyethylene terephthalate yarn, polypropylene yarn, polyethylene yarn.

The optical fiber 100a to which the adhesive 130 is applied is vertically cut in the width direction using the diamond cutter 150, and then stretched to flatten the optical fiber 100a wound in the winding machine 110 in a flat sheet. It forms 200.

The second step is a step of manufacturing the optical fiber block by winding, bonding and cutting continuously the optical fiber sheet completed in the first step to the rotating frame. First, after the optical fiber sheet 200 is manufactured by one of the two methods, the optical fiber sheet 200 is wound on the beam 210, and then the optical fiber sheet 200 is rotated as shown in FIG. 7A. Rewinding continuously to form a square side portion in the rotating frame 220. At this time, the adhesive 130 is continuously coated during the transfer of the optical fiber sheet 200 so that the optical fiber sheet 200 wound on the frame is bonded to each other. In this case, the adhesive 130 uses an improved epoxy AF for the same reason as in the first winding process. In addition, by adjusting the tension of the optical fiber sheet 200 during winding, the optical fiber sheet 200 wound on the rotary frame 220 can be uniformly wound with high density. The rotating frame 220 may take the form of various polygons such as a flat frame 220a, a triangular frame 220b, a cross frame 220c, and the like as shown in FIG. 7B. The shape of each frame has a different number of cutouts in the course of carrying out the cutting described later. On the other hand, as shown in Figure 7a and 7b, using a process of winding and bonding the optical fiber sheet 200 continuously, the optical fiber block of high density with uniform array of optical fibers appearing on the cut surface of the optical fiber block 300 Not only can it be manufactured, there is an advantage that the productivity and efficiency can be increased by manufacturing the optical fiber block 300 in a continuous process.

Subsequently, as shown in FIG. 7C, each side portion of the four sides of the optical fiber sheet 200 wound in the frame 220 in a rectangular shape is wet-cut by the diamond cutter 310 to manufacture the optical fiber block 300. .

On the other hand, the process of manufacturing the optical fiber block 300 through the winding, bonding and cutting process as this step may be carried out continuously in connection with the process of manufacturing the optical fiber sheet, the first step described above. In particular, when using the step of manufacturing the optical fiber sheet by weaving the optical fiber as the first step, the optical fiber sheet woven from the weaving machine can be wound directly on the rotary frame (220 in Figure 7a) without sensing the beam separately. Of course, the woven fiber sheet may be wound around a specific beam and later wound around the rotary frame 220.

In the third step, as shown in FIG. 8A, the optical fiber block 300 formed through the cutting process is wet-cut in a direction perpendicular to the optical fiber axis by using the diamond cutter 310 to cut the optical fiber display plate 400. Forming. The optical fiber display plate 400 has a plurality of optical fiber layer cross sections continuous on the cut surface as shown in FIG. 8B. At this time, the cutting thickness is determined in the range of 5 to 50 mm, and these dimensions are adjusted according to the size of the optical fiber display screen manufactured from the final product. In this case, when the thickness of the optical fiber display panel 400 cut and manufactured is less than 5 mm, there is a disadvantage that it is easily broken due to the influence of the external environment, and when the thickness exceeds 50 mm, the image projected on the screen by the projector Since the length of the optical fiber to pass through is also increased, the optical loss is increased, and the economical efficiency is also lowered due to the increase in the amount of optical fibers used.

And, the cross section perpendicular to the axis of the optical fiber 100a of the optical fiber block 300 (FIG. 8A) or the optical fiber display plate 400 manufactured by cutting the optical fiber block 300 is formed into a rectangle or a square, but is shown in FIG. 8C. By processing the edge portion of the optical fiber block 300 or the optical fiber display plate 400 as described above, to have a cross section of various shapes such as rhombus, trapezoid, parallelogram, triangle, pentagon, hexagon, octagon, octagon in addition to the rectangular or square. You may.

In addition, when the cross section of the optical fiber block 300 or the optical fiber display plate 400 is rectangular, it is easy to manufacture a display screen having an aspect ratio of 4: 3 or 16: 9 which is generally used to represent the current image. In order that the ratio of the cross section to the cross section may be 4: 3 or 16: 9.

In the fourth step, as shown in FIG. 9, the cut surface where the cross section of the optical fiber appears is wetted with a diamond polishing machine 410 while the cut optical fiber display plate 400 is fixed on the flat plate 420 by using a vacuum pressure. Polish.

And, as shown in the lower end of Figure 9, on the surface of the wet-polishing optical fiber display plate 400 of various forms such as circles, rectangles, squares, rhombuses, trapezoids, parallelograms, triangles, pentagons, hexagons, heptagons, octagons By making the intaglio 405, it can be made to act as a shade to prevent interference by direct sunlight, such as sunlight.

The fifth step is assembling a rectangular optical fiber display screen 500 having a desired size by attaching the wet polished optical fiber display plate 400 side by side vertically and horizontally as shown in FIG. 10A. . At this time, the adhesive uses an improved epoxy AF for the same reasons as in the above-mentioned steps.

At this time, in order to improve the durability of the screen, as shown in Figure 10b to insert the optical fiber display plate 400 into the screen reinforcement frame 430 of the same type as the security window made of metal or plastics, and to use It may be. In addition, as shown in Figure 10c, for convenience in future maintenance and maintenance work, after the optical fiber display plate 400 is put in the plate frame 440 made of metal or plastics and bonded, it is again By using the method of fitting to the screen reinforcement frame 430, it is possible to enable the detachment of each optical fiber display plate 400.

An embodiment of the optical fiber display screen according to the present invention manufactured by the method for manufacturing the optical fiber display screen described above is as follows. That is, as shown in Figure 10a, a plurality of optical fiber display panel 400 is formed in such a way that they are bonded to each other by an adhesive so as to be adjacent in the vertical direction and the left and right side direction. 8B, a plurality of optical fibers 100a are stacked and arranged as shown in FIG. 8B, and an epoxy-based adhesive 130 is disposed in a space between the plurality of optical fibers 100a. Is fulfilling. The adhesive 130 is solidified to support the plurality of optical fibers 100a.

Here, the plurality of optical fiber display plate 400 further includes a support for fixing the plurality of optical fibers constituting the same in place. For example, as shown in an enlarged cross-sectional view of FIG. 13, the support may be a chemical fiber or cotton yarn 100b that supports and supports a plurality of arranged optical fibers 100a in a zigzag form.

The operation of the optical fiber display screen is as follows. That is, as shown in FIG. 11, the light 30 projected by the projector 20 is incident on the rear surface of the optical fiber display screen 10, and the incident light is internal due to the difference in refractive index between the core and the clad in the optical fiber. Total reflection allows each fiber inside the screen to pass through the screen on the opposite side of the screen. In this case, since the light loss is minimized while the light 30 projected onto the optical fiber display screen 10 is transmitted through the optical fiber inside the screen, when a projector of the same specification is used to implement an image, Unlike the projection screen made of acrylic or polycarbonate, which combines a Fresnel lens and a lenticular lens, there is no loss due to light scattering, so that a bright image with high brightness can be realized.

The optical fiber display screen is an optical fiber display screen manufactured by using an optical fiber sheet made by condensing optical fibers with high density through the manufacturing method, wherein each optical fiber block constituting the optical fiber display screen has a thickness of 5 to 50 mm, and the screen surface is Wet grinding at the micrometer level with a diamond grinder can produce sharp image quality. And, since the optical fiber display screen can be manufactured by connecting the polished optical fiber display plate in the horizontal and vertical directions perpendicular to the optical fiber axis using an adhesive, the length of the horizontal and vertical directions is the degree of joining the optical fiber display plate There is an advantage that can be produced in the desired size by adjusting the.

As shown in FIG. 8B, the optical fiber display screen has a finer detail than a conventional LED display board because the optical fiber cross section appearing at the screen cross section continuously appears at a high density of 6 to 40,000 / cm 2 depending on the optical fiber diameter and the focusing density. The image projected from the projector by the pixel can be realized in high resolution. At this time, the density of the optical fiber cross section appearing on the screen cross section increases as the diameter of the optical fiber is smaller and the focusing density of the optical fiber is higher. For example, in the case of using an optical fiber having a diameter of 1.00 mm, an optical fiber cross section of 6.25 to 100 / cm 2 may depend on the focusing density. When the optical fiber cross-section of 2 cm 2 uses an optical fiber having a diameter of 0.05 mm, the optical fiber cross-section of 2,500 to 40,000 / cm 2 appears continuously on the display screen cross-section depending on the focusing density.

In addition, since the optical fiber display screen does not implement an image by individually turning on the LED bulb, it plays a role of passing the image projected from the projector, which is superior to the conventional LED display panel in terms of price and power consumption. See Table 2).

Second Embodiment

The second embodiment of the method of manufacturing the optical fiber display screen according to the present invention replaces the second step in the first embodiment with another process. That is, a step of manufacturing an optical fiber block by laminating and pressing while applying an adhesive to the optical fiber sheet prepared in the first step (see FIG. 12), or by winding the optical fiber sheet in the form of a roll (see FIG. 13) Is replaced by. Hereinafter, a description overlapping with the first embodiment will be omitted, and only differences will be described.

First, the steps of manufacturing the optical fiber block by laminating and pressing while applying the adhesive to the optical fiber sheet will be described. As shown in FIG. 12, a plurality of optical fiber sheets 200 manufactured in the first step are stacked. In this case, an adhesive is applied between the plurality of stacked optical fiber sheets 200. As the adhesive, epoxy AF described in the first embodiment is used. The optical fiber block 300 is manufactured by pressing the plurality of stacked optical fiber sheets 200 using the press 230. This method can be used primarily where a continuous manufacturing process for mass production is not required.

Meanwhile, the steps of manufacturing the optical fiber block by winding the optical fiber sheet in a roll form are as follows. As shown in FIG. 13, while applying an adhesive to the optical fiber sheet 200 manufactured through the first step, the optical fiber sheet 200 is wound in a roll shape while maintaining a tension using a mechanical device or the like, and thus the optical fiber block 300. To prepare. At this time, the optical fiber yarn 100a in the optical fiber block 300 faces the roll-shaped longitudinal axis, as shown in the enlarged view of FIG. 13, so that the cross section thereof becomes the cut surface in the next step. In this case, the adhesive used in this case also uses epoxy AF as described above.

Third embodiment

According to a third embodiment of the method of manufacturing an optical fiber display screen according to the present invention, as shown in FIG. 14, the first and second steps of the first embodiment are applied in one step, that is, adhesives are applied to a plurality of optical fibers. While winding to a rotating frame at the same time to replace the step of manufacturing the optical fiber block (merging step of Figure 14). Hereinafter, descriptions overlapping with those in the first embodiment will be omitted, and only differences will be described.

In the merging step of the third embodiment of the present invention, as shown in FIG. 15, a plurality of optical fibers 100a are wound side by side on a roller at a time, and the plurality of optical fibers 100a are square in a frame 220 for rotating the optical fibers 100a. Winding continuously to form the side portion of the. At this time, the adhesive 130 is continuously coated during the transfer of the plurality of optical fiber strands 100a so that the plurality of optical fibers 100a wound on the frame are bonded to each other. As the adhesive 130, an epoxy AF improved as in the first embodiment is used. When using this method, there is no need for a separate process for manufacturing an optical fiber sheet, so the process can be simplified.

Hereinafter, a specific experimental example according to the manufacturing method of the optical fiber display screen according to the present invention will be described, which will be compared with the prior art.

Experimental Example 1

As a first step, a method of manufacturing an optical fiber sheet by weaving an optical fiber was used. To this end, weaving work was carried out using a modified weaving machine of the rapid rapier method. A plastic optical fiber having a diameter of 0.25 mm was used as the weft yarn, and a polyethylene terephthalate multifilament fiber having a slope diameter of 0.22 mm was used. At this time, the weft density was 24 pieces per 1cm, the inclination density was 12 pieces per 1cm, and weaving was performed at a weaving speed of 100 rpm to prepare an optical fiber sheet having a length of 300 m and a width of 1 m based on the inclination direction. At this time, the optical fiber axis is parallel to the width direction of the sheet.

As a second step, the prepared optical fiber sheet was wound on a beam having a width of 180 cm and a diameter of 18 cm. Then, the epoxy AF was continuously buried in the optical fiber sheet wound on the beam (130 of FIG. 7A), such that the sheets continuously wound on the cross-shaped rotary frame 220 were bonded to each other as shown in FIG. 7A. The rotating frame 220 used for winding the optical fiber sheet was manufactured and used so that the distance between the ends of each cross-shaped end was 1 m in the width direction of the optical fiber sheet. The optical fiber sheet 200 is wound at a speed of 5 cm / sec while maintaining a constant tension, while the side wound on the rotating frame 220 to form a square, wound until the wound sheet is 2.5 cm thick 24 Cured for time. After 24 hours, a diamond-coated cutter was cut to a portion corresponding to each side of the quadrangle as shown in FIG. 7C to prepare an optical fiber block 300 having a length of 1 m, a width of 1 m, and a thickness of 2.5 cm.

In a third step, the optical fiber block 300 manufactured in the second step is wet-cut to a thickness of 1 cm in a direction in which a cross section in the longitudinal direction of the optical fiber appears on the cut surface by using a diamond coating cutter, and a length of 1 cm and a width in the optical fiber axial direction. An optical fiber display plate of 1 m and a thickness of 2.5 cm was manufactured.

As a fourth step, a wide cross section in which an optical fiber cross section of the manufactured optical fiber block 300 appears is wet polished using a diamond grinding machine to manufacture an optical fiber display plate 400 (see FIG. 9), and the polished surface is 300 times. Scanning Electron Microscopy (SEM) showed no defects on the surface of the optical fiber, and it was confirmed that the micrometer-level polishing was sufficiently performed.

As a fifth step, the polished optical fiber display plate 400 was bonded and cured to be adjacent to 30 pieces in the height direction, thereby manufacturing an optical fiber display screen having a width of 1 m and a length of 0.75 m (see FIG. 10).

Epoxy AF tested in Table 1 was used for the adhesion of the optical fiber display panel 400, and the form of the screen was fixed through an adhesive curing process for 24 hours after the adhesion, which is referred to as "optical fiber screen A".

Subsequently, while illuminating an image with a projector on the rear side of the optical fiber screen A, the resolution, power consumption, brightness and optical fiber density were evaluated on the opposite front side. In this case, the rear projector uses two Sharp XG-P25X projectors. The fiber optic display screen can express the resolution of the projector projecting from the rear, so the resolution of the projector is recorded as it is. The power consumed by the fiber optic display screen is only the power to operate the projector, so the power is calculated based on the power consumption of the projector. It was. In addition, luminance measurement was performed using the Minolta CS-100A luminance meter. The optical fiber density was observed by ten times of the screen surface with an optical microscope, and the average value was recorded (see Table 2 below for data).

Experimental Example 2

Using a polyethylene terephthalate multifilament fiber having a diameter of 0.22 mm as a weft yarn and a plastic optical fiber having a diameter of 0.25 mm as a ramp, a fiber display screen having a width of 1 m and a length of 0.75 m was manufactured by the same manufacturing process as in Example 1. It is named as fiber optic screen B ". In addition, the optical properties of the optical fiber screen B were evaluated in the same manner as in Experimental Example 1 (see Table 2 below for data).

Experimental Example 3

A plastic optical fiber having a diameter of 1.00 mm was wound in a cylindrical winding machine having a diameter of 3 m and a width of 1.1 m. At this time, the winding was wound at a speed of 3 m / sec while maintaining a constant tension of the optical fiber being wound. The optical fiber was wound while passing through the adhesive applicator conveyed in the width direction from the upper part of the winding machine so that the wound optical fibers were mutually bonded and fixed in the width direction of the winding machine. It was adjusted to be in close contact with. At this time, epoxy AF was used as the adhesive used in each of the experimental examples. Through the above process, an optical fiber sheet having a length of 9.4 m and a width of 1 m was manufactured, wherein the optical fiber axis is parallel to the length direction of the sheet. An optical fiber display block was manufactured by the same method as Experimental Example 1 with the manufactured optical fiber sheet. However, the cross-shaped rotating frame (220c of FIG. 7b) was used to produce a width of 1 m in the width direction of the optical fiber sheet and a distance of 10 cm between each end of the cross shape. As a result, 10 cm in length in the optical fiber axis direction, 1 m in width, An optical fiber block having a thickness of 2.5 cm was prepared. The prepared optical fiber blocks were cut at 1 cm intervals to produce an optical fiber display plate having a length of 1 cm, a width of 1 m, and a thickness of 2.5 cm in the direction of the optical fiber axis. An optical fiber display screen having a width of 1 m and a length of 0.75 m was manufactured from the optical fiber plate manufactured through the above process through a polishing and assembly process as described in Experimental Example 1, and named as "optical fiber screen C". Optical properties were evaluated in the same manner as in Example 1 (see Table 2 below for data).

Experimental Example 4

An experimental example in which the optical fiber display screen is manufactured by applying the third embodiment of the present invention will be described.

As shown in FIG. 15, 1000 strands of the plastic optical fiber 100a having a diameter of 1.00 mm were wound on the rotating frame 220 at once. The rotating frame 220 used for the winding of the optical fiber 100a was manufactured so that the width was 1 m in the direction perpendicular to the longitudinal direction of the optical fiber 100 a and the distance between each end of the cross shape was 1 m. The optical fiber 100a is wound at a speed of 5 cm / sec while maintaining a constant tension, while the side wound on the rotating frame 220 forms a quadrangle, until the thickness of the wound optical fiber 100a layer becomes 2.5 cm. Then cured for 24 hours. After 24 hours, a diamond-coated cutter was cut to a portion corresponding to each side of the quadrangle as shown in FIG. 7C to prepare an optical fiber block 300 having a length of 1 m, a width of 1 m, and a thickness of 2.5 cm. An optical fiber display screen having a width of 1 m and a length of 0.75 m was manufactured from the optical fiber block manufactured through the above process through the cutting, polishing, and assembly processes as described in Experimental Example 1, and named as "optical fiber screen D". , Optical properties were evaluated in the same manner as in Experimental Example 1 (see Table 2 below for data).

On the other hand, the screen using the prior art as a comparative example with Experimental Example 1, 2, 3, 4 according to the present invention is as follows.

(Comparative Example 1)

In general, the optical properties of a commercially available, rear-projection screen of a conventional polycarbonate material was evaluated in the same manner as in Experiment 1. However, since the screen of the polycarbonate material does not pass light projected from the projector as it is, it is a method of realizing the image by scattering, so it is difficult to properly implement the resolution of the projector, so the resolution item is not recorded. At this time, the polycarbonate screen used a thing 1 m wide and 0.75 m long.

(Comparative Example 2)

The optical characteristics of the LED display board were evaluated by using information of a commercially available and installed RGB system product.

Measurement data of the above Experimental Examples 1, 2, 3, 4 and Comparative Examples 1, 2 are as shown in Table 2 below.

As shown in Table 2, the screens A, B, C, and D made of optical fiber have higher brightness than conventional polycarbonate screen, and have high resolution and low power consumption compared to LED display board. In this case, the two existing products can be sufficiently replaced.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the scope of the invention provided by the following claims. I would like to make it clear that someone with knowledge can easily know.

As described above, according to the present invention, the optical fiber display screen manufactured by the method of manufacturing the optical fiber display screen is more popular than the conventional rear projection projection screen or LED display board, due to the significantly lower power consumption and production cost. It is possible to realize high-brightness, high-resolution medium-large image by efficiently displaying the light projected from the light source projection equipment such as a projector, so that outdoor video billboard, advertisement status board, display interior, various format signboard, mobile advertisement There is an effect that can be used in a wide range of applications, such as imaging vehicles.

Moreover, according to the manufacturing method of the optical fiber display screen of this invention, since a large number of optical fibers can be efficiently focused in terms of workability and productivity, there exists an effect which can manufacture a large display screen using an optical fiber easily. In addition, it is possible to increase the process efficiency by differentiating the effective manufacturing method according to the diameter of the optical fiber.

Claims (28)

delete A first step of weaving an optical fiber sheet using a fiber weaving machine to weave the optical fiber in a plain weave using a weft or warp yarn and a chemical fiber or cotton yarn as a warp or weft yarn; Stacking the optical fiber sheets, bonding the laminated optical fiber sheets to each other by applying an adhesive, and cutting the second optical fiber sheet; A third step of cutting the optical fiber block to a predetermined thickness so that a cross section of the optical fiber appears to form an optical fiber display plate; Polishing a cut surface of the optical fiber display plate; And a fifth step of manufacturing the optical fiber display screen by fixing and arranging the polished optical fiber display panel with an adhesive so as to neighbor in the lateral direction. In the second step, the optical fiber sheet is continuously wound on a rotary frame, and the optical fiber sheets are wound by applying an adhesive to the wound optical fiber sheets, and then cut to prepare an optical fiber block or applying the adhesive to the optical fiber sheet. A method of manufacturing an optical fiber display screen, wherein the optical fiber blocks are manufactured by winding them in a roll to bond the optical fiber sheets to each other. The optical fiber sheet of claim 2, 25 to 70% of the unit length on the optical fiber sheet is woven at a density that is filled with the optical fiber. According to claim 2, wherein the textile weaving machine, A method for producing an optical fiber display screen, wherein the weeping speed is 50 to 300 rpm. A first step of manufacturing an optical fiber sheet by laminating an optical fiber on a winding machine and adhering the optical fibers to each other with an adhesive, and then cutting one side of the wound optical fiber and separating it from the winding machine; Stacking the optical fiber sheets, bonding the laminated optical fiber sheets to each other by applying an adhesive, and cutting the second optical fiber sheet; A third step of cutting the optical fiber block to a predetermined thickness so that a cross section of the optical fiber appears to form an optical fiber display plate; Polishing a cut surface of the optical fiber display plate; And a fifth step of manufacturing the optical fiber display screen by adhesively arranging the polished optical fiber display panel to be adjacent to each other in a lateral direction and manufacturing the optical fiber display screen. The method of claim 5, wherein Method of manufacturing an optical fiber display screen, characterized in that for inserting the strength reinforcing sheet between the laminated optical fiber layer. The method of claim 5, wherein the second step, The method of manufacturing an optical fiber display screen, characterized in that the step of winding the optical fiber sheet continuously to the rotating frame, but the optical fiber sheet to be wound by applying an adhesive to each other and then cut to produce an optical fiber block. delete The method of claim 5, wherein the second step, Manufacturing an optical fiber block by winding the optical fiber sheet in a roll form while adhering an adhesive to the optical fiber sheet and adhering the optical fiber sheets to each other. A merging step of manufacturing an optical fiber block by applying and adhering an adhesive to a plurality of optical fibers arranged side by side and winding the rotary frame; A third step of cutting the optical fiber block to a predetermined thickness so that a cross section of the optical fiber appears to form an optical fiber display plate; Polishing a cut surface of the optical fiber display plate; And a fifth step of manufacturing the optical fiber display screen by adhesively arranging the polished optical fiber display plate to the side in the vertical, vertical, horizontal directions. The method of claim 2, 5 or 10, wherein the third step comprises: And manufacturing the optical fiber display plate by wet cutting the optical fiber block in a direction perpendicular to the optical fiber axis with a diamond cutter at intervals of 5 to 50 mm thickness. The method according to any one of claims 2, 5 and 10, The optical fiber display plate, A method for manufacturing an optical fiber display screen, characterized in that the side ends are cut into predetermined portions to form a polygonal plate shape. The method of claim 2, 5 or 10, wherein the fourth step, And wet grinding the cut surface of the optical fiber display plate using a diamond polishing machine. delete The method according to any one of claims 2, 5 and 10, The optical fiber, A method of manufacturing an optical fiber display screen, the diameter of which is in the range of 0.05mm to 1.00mm. The method according to any one of claims 2, 5 and 10, The adhesive, A method of manufacturing an optical fiber display screen, characterized in that the carbon component is contained in an epoxy-based adhesive or an epoxy-based adhesive. In the optical fiber display screen is formed by a plurality of optical fiber display plate is fixedly arranged so as to neighbor in the vertical and horizontal directions, The optical fiber display plate, A plurality of optical fibers in which both end surfaces of each optical fiber form the front and rear surfaces of the optical fiber display panel, and the optical fibers are stacked and arranged; Occupies the space between the plurality of optical fibers to form the front and rear surfaces of the optical fiber display panel with the plurality of optical fibers, and comprises a substrate made of an adhesive for fixing and supporting the plurality of optical fibers, And a strength reinforcing sheet is inserted between the plurality of optical fiber layers. The method of claim 17, wherein the optical fiber, And the diameter thereof is in the range of 0.05mm to 1.00mm. The method of claim 17, wherein the optical fiber, And a density of 6 to 40,000 pcs / cm 2 on the surface of the optical fiber display plate. The method of claim 17, wherein the substrate, An optical fiber display screen comprising a carbon component. The method of claim 20, wherein the optical fiber display plate, Further comprising a support for supporting the plurality of optical fibers to be fixed in place, And the substrate fixes and supports the plurality of optical fibers and the support together. delete The method of claim 17, wherein the optical fiber display plate, And a surface having a polygonal shape. delete The optical fiber display screen of claim 17, wherein And a plurality of said optical fiber display plates are mutually bonded with a fixed arrangement and an adhesive such that the plurality of said optical fiber display plates are laterally adjacent. The optical fiber display screen of claim 17, wherein It is further provided with a screen reinforcement frame having a plurality of arranged spaced portion inside, And the optical fiber display plate is inserted into the space part and adhered to the screen reinforcement frame with an adhesive. The optical fiber display screen of claim 17, wherein It is further provided with a plate frame in which one space part is formed inside, It is further provided with a screen reinforcement frame having a plurality of arranged spaced portion inside, And the optical fiber display plate is fitted to the space part of the plate frame and adhered to the plate frame, and the plate frame is inserted to be detachable from the space part of the screen reinforcement frame. The method according to any one of claims 17 and 25 to 27, wherein the adhesive, An optical fiber display screen comprising a carbon component.

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