JP2008102472A - Composite type brightness enhancement film having light scattering particle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance transmittance of primary light, to avoid total reflection of light and to suppress a light attrition rate low by forming a plurality of curved prism units on one surface of a substrate and embedding a plurality of light scattering particles in the curved prism units to effectively scatter incident light beams. <P>SOLUTION: A first surface 11a and a second surface 11b are formed on a base material 11. The curved prism unit 12 is arranged at the first surface 11a of the base material 11 and the light scattering particles 13 are embedded at least in the curved prism unit 12. Thereby light beams incident on the second surface 11b are simultaneously scattered. Further at least one meandering extended curved surface is formed at the curved prism unit 12 and thereby proper change in surface curvature is produced to introduce and refract the light beams at least in two dimensions and to emit the light beams again from the curved prism unit 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a composite brightness enhancement film having diffusing particles, and in particular, in a brightness enhancement film used for a liquid crystal display, a plurality of curved rhomboid units are formed on one surface. In addition, the present invention relates to a composite brightness enhancement film that can provide a double effect of diffusion and light collection by mixing a plurality of diffusion particles.

  As a conventional brightness enhancement film, as shown in FIGS. 10 and 11, the brightness enhancement film 9 includes a substrate 91 and a plurality of rhomboid unit 92, and the rhomboid unit 92 is a first surface of the substrate 91. Arranged in parallel with each other. The rhomboid column unit 92 is composed of two inclined surfaces, and there is one in which the rhomboid column unit 92 refracts light rays to cause a phenomenon of condensing.

  Further, as a conventional diffusion film, “OPTICAL FILM FOR BLCKLIGHT UNIT AND BLCKLIGHT UNIT USING THE SAME” of PCT Patent Application No. 2005/006030 includes a substrate, a reflection pattern, and a plurality of diffusion particles. A reflection pattern is formed on the surface of the substrate, and light can be refracted by the substrate to cause a light collecting phenomenon. Some diffused particles are dispersed in each part of the reflection pattern and the substrate so that the light beam is formed to have a diffusion effect (for example, see Patent Document 1).

  Further, as a conventional diffusion film, a “light diffusion film” in JP-A No. 09-304607 includes a substrate and a light diffusion layer. A light diffusing layer is formed on the surface of the substrate, and light can be refracted by the substrate to cause a light condensing phenomenon. The light diffusing layer is composed of one transparent resin and a plurality of fine particles, the fine particles are dispersed in the transparent resin, and a fine rough surface is formed on the surface of the light diffusing layer, so that the light is diffused. There are some which are formed so as to provide an effect (see, for example, Patent Document 2).

  In addition, as a conventional diffusion film, US Pat. No. 6,417,831, “DIFFUSED LIGHT CONTROLLING OPTICAL SHEET, BACK LIGHT DEVICE AND LIQUID CRYSTAL DISPLAY APPARATUS” includes a substrate, a plurality of protrusions and a plurality of fine materials. included. Projections are formed on the surface of the substrate, and light can be refracted by the substrate to cause a phenomenon of light collection. There are other projections in which fine materials are dispersed and a rough surface is formed on the surface of the projection so that the light beam is formed to provide a diffusion effect. (For example, see Patent Document 3).

  In addition, as a conventional diffusion film, “OPTICAL DIFFUSION PLATE APPLIED FOR DIRECT-TYPE BACKLIGHT MODULE AND MANUFACTURING METHOD THEREOF” of US Publication No. 2005/0257363 includes a substrate, a sawtooth structure layer, and an optical diffusion agent. A sawtooth structure layer is formed on the surface of the substrate, and a light beam can be refracted by the substrate to cause a light collecting phenomenon. Some of the substrate and the sawtooth structure layer are mixed with an optical diffusing agent at the same time so that light rays are formed so as to provide a diffusion effect (see, for example, Patent Document 4). .

  In addition, as a conventional brightness enhancement film, the “Backlight module using a brightness enhancement film and a brightness enhancement film” disclosed in the Republic of China No. M277950 includes a substrate, a plurality of rod-shaped rhombus mirrors, and a plurality of scattering particles. It is. A rod-shaped rhombus mirror is formed on the surface of the substrate, and light can be refracted by the substrate to generate a light condensing phenomenon. Some scattering particles are mixed in a substrate so that light rays are formed so as to provide a diffusion effect (see, for example, Patent Document 5).

Furthermore, as a conventional brightness enhancement film, “BRIGHTNESS ENHANCEMENT FILM HAVING CURVED PRISM UNITS” of US Publication No. 2005/0237641, which is an application of the present applicant, has a substrate and a plurality of curved rhombus prism units. included. A curved rhombus column unit is formed on the surface of the substrate, and each curved rhombus column unit is formed with at least one curved extended curved surface. The substrate has a change in curvature and refracts light rays to collect light in two dimensions. There is one that can cause a phenomenon (see, for example, Patent Document 6).
PCT Patent Application No. 2005/006030 Specification JP 09-304607 A US Pat. No. 6,417,831 US Publication No. 2005/0257363 Republic of China Notice No. M277950 US Publication No. 2005/0237641

  In the conventional brightness enhancement film as described above, for example, when the light beam 93 is incident on the substrate 91 at a relatively large incident angle relative to the second surface of the substrate 91 (that is, the light beam 93 is incident on the second surface of the substrate 91). The light beam 93 can be smoothly refracted and emitted from the rhomboid unit 92 on the first surface of the substrate 91 (so as not to be relatively perpendicular to the surface). However, when the light beam 94 is incident on the substrate 91 at a relatively small incident angle (less than 6 ° to less than 9 °) relative to the second surface of the substrate 91 (that is, the light beam 94 is different from the second surface of the substrate 91). Since the light ray 94 is refracted and cannot be emitted from the rhomboid unit 92 and is again emitted from the second surface of the substrate 91 by total reflection, the light beam 94 is transmitted through the primary transmission. The problem is that the rate is reduced and the rate of light consumption is increased.

  In addition, in the conventional brightness enhancement films such as those disclosed in Patent Document 1 to Patent Document 5, all the diffusion particles are mixed in the substrate and / or the refraction pattern layer. Therefore, there is a problem that the refractive design layer does not have a curved structure.

  Further, in the conventional brightness enhancement film posted in Patent Document 6, the brightness enhancement film is further improved in order to obtain a relatively good light collecting effect with respect to those of Patent Document 1 to Patent Document 5. is there. The present invention is also intended to improve the problems of the conventional brightness enhancement film described above based on the curved rhomboid unit previously filed by the applicant of the present invention.

  The present invention was invented in view of such problems, and the object of the present invention is to form a plurality of curved rhomboid column units on one surface of a substrate, and the curved rhombus column unit is suitable. Used to produce a change in surface curvature, and by mixing a plurality of diffusing particles into a curved rhomboid unit, it can provide a dual effect due to two-dimensional focusing and uniform diffusion, and at a smaller angle It is intended to provide a composite brightness enhancement film having diffusing particles that can effectively increase the transmittance of the primary light and reduce the light consumption rate by reducing the probability of total reflection by the incident light. It is.

  A first object of the present invention is to form a plurality of curved rhomboid column units on one surface of a substrate, mix a plurality of diffusing particles in the curved rhomboid column unit, and effectively scatter incident light rays. Thus, it is to provide a composite brightness enhancement film having diffusion particles that can increase the transmittance of the primary light, avoid the total reflection of the light, and keep the light consumption rate low.

  A second object of the present invention is to form a plurality of curved rhomboid column units on one surface of a substrate, mix a plurality of diffusing particles in the curved rhomboid column unit, and control the emission angle of incident light rays. Another object of the present invention is to provide a composite brightness enhancement film having diffusion particles that can increase the brightness of the brightness enhancement film by concentrating scattered light rays that have already been diffused.

  A third object of the present invention is to form a plurality of curved rhomboid column units on one surface of a substrate, mix a plurality of diffusing particles in the curved rhomboid column unit, and uniformly scatter incident light rays. Thus, it is to provide a composite brightness enhancement film having diffusing particles capable of improving the uniformity of the light source and further modifying the light source.

  A fourth object of the present invention is to form a plurality of curved rhomboid column units on one surface of a substrate, mix a plurality of diffusing particles in the curved rhomboid column unit, and uniformly distribute incident light rays. Dispersion increases the uniformity of brightness, increases the angle of horizontal and vertical half-brightness, increases the viewing angle, and further provides a composite brightness enhancement film having diffusion particles that increase the brightness value of the large viewing angle That is.

  A fifth object of the present invention is to form a plurality of curved rhomboid column units on one surface of a substrate, mix a plurality of diffusing particles in the curved rhomboid column unit, and scatter incident light. By obtaining a high fog concentration, by providing a composite brightness enhancement film with diffusing particles that can modify defects in the structure of the brightness enhancement film, increase the yield of the product, and further reduce the manufacturing cost. is there.

  A sixth object of the present invention is to form a plurality of curved rhomboid column units on one surface of a substrate, mix a plurality of diffusing particles in the curved rhomboid column unit, and uniformly scatter incident light rays. Therefore, it is not necessary to install the diffusion film together again, and thus it is to provide a composite brightness enhancement film having diffusion particles that can simplify the module of the back light and can keep the assembly cost low.

In order to achieve the above object, a composite brightness enhancement film having diffusing particles according to the present invention is as follows. That is,
It is composed of a base material, a plurality of curved rhomboid units, and a plurality of diffusion particles. A first surface and a second surface are formed on the substrate. By forming at least one curved stretched curved surface in the plurality of curved rhomboid prism units, light incident from the second surface is guided to generate at least two-dimensional refraction. Further, the plurality of diffusing particles are mixed in at least the curved rhomboid prism unit, so that the light rays incident from the second surface are simultaneously diffused and formed so as to be emitted from the curved rhomboid prism unit again. .

  In the composite brightness enhancement film having diffusion particles according to the present invention, the mixing weight ratio of the diffusion particles relative to the curved rhomboid unit may be between 1% and 35%. Further, the diffusing particles can be selected from an acrylic material or a glassy material. Further, the glassy material can be selected from silicon dioxide, dialuminum trioxide, boron oxide, calcium oxide, magnesium oxide, silicon resin, polyester resin, or styrene resin. Also, the average particle size of the diffusing particles can be between 0.5 microns and 30 microns. In addition, the shape of the diffusing particles can be selected from spherical, oval, elliptical, kanban, oval or irregular polyhedral. Further, the at least one curved extended curved surface of the curved rhomboid column unit may be selectively formed to have a plurality of side spines. The curved rhomboid unit may be composed of a first inclined surface and a second inclined surface, and at least one of the first inclined surface and the second inclined surface may be formed of the curved stretched curved surface. In addition, the first inclined surface and the second inclined surface of the curved rhomboid column unit may be formed to have a plurality of side spines selectively crossed. In addition, the angle of the wave crests of the first inclined surface and the second inclined surface of each curved rhombus column unit may be between 70 ° and 160 °. Also, each two adjacent curved rhomboid units can change surface curvature along the same regular curved path. In addition, each two adjacent curved rhomboid column units can also change the surface curvature along different regular curved paths. The curved rhomboid unit may also be formed to have substantially the same vertical height relative to the substrate. Also, the vertical height of the curved rhomboid unit can be between 10 microns and 100 microns. The horizontal width of the curved rhomboid unit can also be between 10 microns and 250 microns. The curved rhomboid unit can also be selected from UV curable adhesives. The substrate can also be selected from flexible transparent substrates. The flexible transparent substrate can also be selected from polyethylene terephthalate, polyethylene, polyethylene naphthalate, polycarbonate, polyvinyl alcohol, polyvinyl chloride, or a polymer compound. In addition, the plurality of diffusing particles simultaneously cause the light rays incident on the second surface to diffuse, and are emitted from the curved rhomboid unit again, thereby changing the transmittance of the primary light rays from 10% to 90%. It can also be increased to% during

  According to the composite brightness enhancement film having the diffusing particles of the present invention, a plurality of curved rhomboid column units are formed on one surface of the substrate, and a plurality of diffusing particles are mixed and incident on the curved rhombus column unit. By effectively scattering the light beam, there is an advantage that the transmittance of the primary light beam can be increased, total reflection of the light beam can be avoided, and the light consumption rate can be kept low.

  According to the composite brightness enhancement film having the diffusing particles of the present invention, a plurality of curved rhomboid column units are formed on one surface of the substrate, and a plurality of diffusing particles are mixed and incident on the curved rhombus column unit. There is an advantage that the brightness of the brightness enhancement film can be increased by controlling the emission angle of the reflected light and concentrating the scattered light that has already been diffused.

  According to the composite brightness enhancement film having the diffusing particles of the present invention, a plurality of curved rhomboid column units are formed on one surface of the substrate, and a plurality of diffusing particles are mixed and incident on the curved rhombus column unit. By uniformly scattering the light beam, there is an advantage that the uniformity of the light source can be increased and the light source can be further modified.

  According to the composite brightness enhancement film having the diffusing particles of the present invention, a plurality of curved rhomboid column units are formed on one surface of the substrate, and a plurality of diffusing particles are mixed and incident on the curved rhombus column unit. Scattering the light rays until they are uniformly distributed increases the uniformity of brightness, increases the horizontal and vertical half-brightness angles, increases the viewing angle, and further increases the brightness value of the large viewing angle.

  According to the composite brightness enhancement film having the diffusing particles of the present invention, a plurality of curved rhomboid column units are formed on one surface of the substrate, and a plurality of diffusing particles are mixed and incident on the curved rhombus column unit. Scattering light rays to obtain a relatively high fog density has the advantage that it can modify defects in the structure of the brightness enhancement film, increase product yield, and keep manufacturing costs low.

  According to the composite brightness enhancement film having the diffusing particles of the present invention, a plurality of curved rhomboid column units are formed on one surface of the substrate, and a plurality of diffusing particles are mixed and incident on the curved rhombus column unit. By uniformly scattering the light rays to be scattered, there is no need to install the diffusion film together again. Therefore, there is an advantage that the back light module can be simplified and the assembling cost can be kept low.

  Embodiments of the present invention will be described below with reference to the drawings.

  Referring to FIGS. 1 and 2, the composite brightness enhancement film 1 having diffusion particles according to the first embodiment of the present invention includes a base material 11, a plurality of curved rhomboid unit 12, and a plurality of diffusion particles 13. . The substrate 11 is formed with a first surface 11a and a second surface 11b, and the substrate 11 is used for penetrating and transmitting light rays. The first surface 11a of the substrate 11 can preferably be the light exit side of the substrate 11 and the second surface 11b can preferably be the light incident side of the substrate 11, but vice versa. . The curved rhomboid column unit 12 is composed of a microstructure unit having a curved outline, and the curved rhomboid column units 12 are arranged on the first surface 11a of the substrate 11 so as to be adjacent to each other. 12 is preferably formed so as to be located on the light emitting side of the substrate 11, but it may be formed so as to be located on the light incident side. The curved rhomboid column unit 12 is composed of a first inclined surface 12a and a second inclined surface 12b, and at least one of the first inclined surface 12a and the second inclined surface 12b is formed of a curved stretched curved surface, and is regular or irregular. By forming the wave-like curve, the surface curvature can be changed, and the light can be refracted in at least a two-dimensional direction, so that a good light collecting phenomenon can be caused.

  Referring to FIGS. 1 and 2 again, more specifically, in the first embodiment of the present invention, the angle of the wave crests of the first inclined surface 12a and the second inclined surface 12b of each curved rhomboid column unit 12 is preferably 70 °. Between 160 ° and 160 °, in particular between 85 ° and 95 °. Each two adjacent curved rhomboid column units 12 preferably have substantially the same vertical height H (the vertical height refers to a height perpendicular to the plane of the substrate 11). The vertical height formed is preferably between 10 μm and 100 μm, in particular between 20 μm and 75 μm. Each of the two adjacent curved rhomboid column units 12 is preferably selectively formed to have a horizontal width W (the horizontal width refers to a width parallel to the plane of the substrate 11). The horizontal width is preferably between 10 μm (micron) and 250 μm (micron), in particular between 25 μm and 80 μm. Further, each two adjacent curved rhomboid column units 12 are preferably formed to selectively change the surface curvature along a curved path of the same rule, for example, the change of the curved path is first 5 μm toward the right. It can be curved and then curved 5 μm to the left, but the surface curvature can be varied along different regular or irregular curved paths.

  Referring to FIG. 2a, in the composite brightness enhancement film 1 having diffusing particles of Example 2 of the present invention, the first inclined surface 12a and the second inclined surface 12b of the curved rhomboid column unit 12 (that is, at least one curved stretch). (Curved surface) can be provided so that a plurality of side spines 121 which are selectively crossed with each other protrude so that a continuous change, the same surface curvature or a different surface curvature change can be selected. .

  Referring to FIGS. 1 and 2 again, the base material 11 and the curved rhomboid column unit 12 according to the first embodiment of the present invention can be manufactured from the same translucent material using an integral molding method. Alternatively, the base material 11 and the curved rhomboid unit 12 can be manufactured from different light-transmitting materials using a molding method such as adhesion, stamping, roll, or stamping, so that different characteristics or manufacturing requirements can be answered. In addition, the scope of application of the present invention and the degree of manufacturing freedom can be increased. The base material 11 can be selected from various flexible transparent base materials such as polyethylene terephthalate (PET), polyethylene (PE), polyethylene naphthalate (PEN), polycarbonate (PC), and polyvinyl. It can be selected from at least one of alcohol (PVA), polyvinyl chloride (PVC) or other polymer compound or a composition thereof. Further, the curved rhomboid column unit 12 can be preferably selected from an ultraviolet curable adhesive (UV adhesive).

Referring to FIGS. 1 and 2 again, and simultaneously referring to the 500 × micrograph of the microscope with the composite brightness enhancement film having the diffusing particles of Example 1 of the present invention shown in FIG. The diffusing particles 13 are randomly mixed in the material of the curved rhomboid column unit 12 according to a predetermined ratio, and the ratio of the weight of the diffusing particles 13 relative to the curved rhomboid column unit 12 is preferably about 1% to 35. %, Especially between about 1% and 25%. The diffusing particles 13 are preferably selected from materials different from those of the curved rhomboid unit 12, for example, an acrylic material and / or a glass material, and the glass material is silicon dioxide (SiO ₂ ), Dialuminum trioxide (Al ₂ O ₃ ), Boron oxide (B ₂ O ₃ ), Calcium oxide (CaO), Magnesium oxide (MgO), Silicone resin, Polyester resin or Styrene resin resin) or a composition thereof. Therefore, any kind of conventional mixing method can be adopted in the present invention during the manufacturing process, for example, an acrylic material or glass of suitably 1 to 35 weight units in an ultraviolet curable adhesive every 100 weight units. By mixing the material, the structure of the curved rhomboid unit 12 in which the diffusion particles 13 are mixed can be produced. The average particle diameter of the diffusion particles 13 is preferably maintained between 0.5 μm (micron) and 30 μm (micron), and in particular, the average particle diameter is between 0.5 μm (micron) and 10 μm (micron). Can help control the quality of processing. The shape of the diffusing particles 13 can be selected from at least one of a spherical shape, an oval shape, an ellipse shape, an erosion shape, an oval shape, an irregular polyhedral shape, or a mixture thereof.

  Referring to FIGS. 1, 2, and 3 again, in the brightness enhancement film 1 according to the first embodiment of the present invention, the first inclined surface 12a and the second inclined surface 12b of the curved rhomboid column unit 12 are selected to be the same or not. However, at least one of the first inclined surface 12a and the second inclined surface 12b is formed of a curved stretched curved surface, and the curved stretched curved surface forms a regular or irregular wave-like curved surface. Can be used to guide the light beam 14 or the light beam 15 incident from the second surface 11b of the substrate 11 to cause at least two-dimensional refraction. Further, the diffusion particles 13 of the present invention are irregularly or regularly mixed in the curved rhomboid column unit 12 based on the disparity of the materials, and further, the boundary surface of the intersection of each diffusion particle 13 and the curved rhomboid column unit 12 (Not shown) provides a light refraction interface, so that the light 14 or light 15 can form diversified refraction and scattering by the intersection interface, so the relative diffusion and angle The probability of change can be increased.

  Thus, referring to FIG. 3, the light beam is incident on the substrate 11 at a relatively large incident angle relative to the second surface 11 b of the substrate 11 (that is, the light beam 14 is incident on the second surface of the substrate 11). Or the light beam 15 is incident on the substrate 11 at a relatively small incident angle (less than 6 ° to less than 9 °) relative to the second surface 11b (ie, the light beam 15 is When the light beam 14 and the light beam 15 are all changed in angle by the diffusing particles 13, the effect of diffusion can be obtained. Since the diffusion particles 13 cause infinite diffusion spectroscopy, the emission angle can be corrected and the light beam can be concentrated. Therefore, the diffused particles 13 can be smoothly refracted and the second inclined surface 12a and the second inclined surface 12a of the curved rhomboid unit 12 can be concentrated. At the same time as it can be ejected from the inclined surface 12b, it is possible to relatively increase the fog concentration and to modify structural defects.

  More specifically, the diffusion particle 13 of the present invention can effectively suppress the total reflection of light rays with a low probability. In addition, since the first inclined surface 12a and the second inclined surface 12b of the curved rhomboid column unit 12 can also provide the curvature of the curved surface, the probability of total reflection of light rays is suppressed, and scattered light rays that have already been diffused can be reduced. Concentrate and further increase the brightness of the brightness enhancement film.

  Referring to FIG. 4, FIG. 4 is a curve diagram of the primary light transmittance and reflectance of the composite brightness enhancement film having the diffusion particles of Example 1 of the present invention. According to the composite type brightness enhancement film having the diffusing particles of the present invention, the transmittance of the primary light beam 14 and the light beam 15 can be significantly increased, and the light consumption rate can be kept low. That is, by mixing diffusing particles in the existing UV-curing adhesive, the original small-angle incident light beam is scattered through the diffusing particles, and then the angle correction and concentration of the light beam in the curved rhomboid prism unit. After passing through, the emission from the first surface again reaches an increase in the “primary ray transmittance” and reduces the “total reflection” of incident light at a small angle, reducing the “light consumption rate”. In addition, it is possible to obtain a condensing effect by at least two dimensions that is optimal.

  Referring to FIG. 5, FIG. 5 shows a composite brightness enhancement film 1 (curved rhomboid unit 12 including diffusion particles 13) having diffusion particles of Example 1 of the present invention and a conventional brightness enhancement film 9 shown in FIG. It is a curve comparison figure of the transmittance | permeability of a primary ray with (the curved rhombus prism unit which does not contain a diffusion particle). Compared with the conventional brightness enhancement film 9 shown in FIG. 11, the increase in the primary transmittance of the brightness enhancement film 1 of the present invention is between about 10% and 90%. In addition, the uniformity of the light source can be improved, the light source can be modified, the luminance uniformity is increased, the horizontal and vertical half-brightness angle is increased, the viewing angle is increased, and the luminance value of the large viewing angle is increased. There is an advantage, and by obtaining a relatively high fog density, it is possible to modify defects in the structure of the brightness enhancement film 1, increase the yield of the product, and keep the manufacturing cost low. In particular, since the incident light beam can be uniformly scattered by using the brightness enhancement film 1 alone, if the brightness enhancement film 1 of the present invention is used in the back light module (not shown), any diffusion film can be used again. Since it is not necessary to install them together or the demand for the diffusion film can be reduced, the back light module can be simplified in the present invention, and the cost of assembly in the subsequent assembly operation can be kept low.

  Referring to FIGS. 6 and 7, FIGS. 6 and 7 show a composite brightness enhancement film (the present plan shown in FIGS. 6 and 7) having diffusion particles of Example 1 of the present invention and a brightness enhancement without conventional diffusion particles. It is a comparison figure of the luminance value of a horizontal and a vertical viewing angle in the state which uses a film (the plan shown in FIG. 6, 7) by overlapping two times. As shown in FIGS. 6 and 7, the results of the test are as follows. In the state of “lower diffusion film only”, the luminance value is the lowest value. In addition, through the mixing with different proportions of diffusing particles, the state of the “plan 2 lantern” has a better optical luminance expression and diffusion ability than the state of the “plan 2 lantern + bottom diffusion film”, and the present plan. Since the brightness enhancement film of this example has the advantage that the “mist density” is relatively high, it can reach the effect of modifying the “structural defects”. Similarly, when mixing the ratios of diffusion particles in different ratios, comparing the state of the “planned ditension + upper diffusion film” and the “prior plan bitension + upper diffusion film and lower diffusion film”, The curve of the brightness value of the “upper diffusion film” has a further increasing tendency. In addition, the luminance value reaches the highest value in the state of “main plan one stretch + previous plan one stretch”. In other words, when using “this plan one stretch + previous plan one stretch”, compared to each of the other states, they all have a more excellent optical surface, and there is no need to use a lower diffusion film. In addition, it can reach the effect of the conventional brightness enhancement film, and the bi-layer structure of the present invention does not need to use the upper diffusion film and the lower diffusion film, and can reach the effect of the conventional brightness enhancement film, Moreover, it includes the effects of modifying the defects of the rhombus mirror and making the light source uniform.

  Referring to FIGS. 8 and 9, FIGS. 8 and 9 show that the composite brightness enhancement film having the diffusing particles of Example 1 of the present invention is mixed with a relatively low ratio of diffusing particles (see FIGS. 8 and 9). Zhang A), a relatively high proportion of diffusing particles are mixed (the present monotonic B shown in FIGS. 8 and 9), and a conventional brightness enhancement film containing no diffusing particles (the previous plan shown in FIGS. 8 and 9) alone It is a comparison figure of the luminance value of the horizontal and vertical viewing angle in the state of use. As shown in FIGS. 8 and 9, the results of the test are as follows. In the state of “lower diffusion film only”, the luminance value is the lowest value. “Proposed monotonic A” or “Proposed monotonic B” has a more uniform distribution of luminance values than “lower diffusion film + previous plan”. Further, “the present monotonic A” or “the present monotonic B” is combined with the diffusion effect, and the horizontal half-luminance angle and the vertical half-luminance angle are all increased (for example, the horizontal half-luminance angle is changed from 42 °). The horizontal viewing angle increases, and at the same time the energy of the central viewing angle diffuses to a relatively large viewing angle, so the vertical viewing angle also increases. . Furthermore, in the situation of a large viewing angle, “the present monotonic A” or “the present monotonic B” has higher brightness uniformity than “the lower diffusion film + the former”, for example, the vertical survey angle is 40 °. In this case, the luminance values of “the present monotonic A” or “the present monotonic B” are all higher than the luminance values of “the lower diffusion film + the former”. Moreover, since it is not necessary to use an upper diffusion film again by already having fog density in this invention, use of a diffusion film can be saved effectively.

  As described above, according to the conventional brightness enhancement film 9 shown in FIG. 11, the brightness enhancement film 9 is likely to be emitted again from the second surface of the substrate 91 due to the total reflection of the light beam 94, and thus the efficiency of the primary transmittance of the light beam 94. However, according to the composite brightness enhancement film having the diffusing particles of the present invention shown in FIG. 3, the first surface 11a of the substrate 11 is reduced. By forming the curved rhomboid column unit 12 and mixing the diffusing particles 13 in the curved rhomboid column unit 12, it is possible to reliably provide at least a two-dimensional light collecting effect and a uniform diffusion effect, It is possible to reduce the probability that the incident light of a small angle is totally reflected, effectively increase the primary transmittance, and keep the light consumption rate low.

  The present invention may be implemented in other ways without departing from the spirit and essential characteristics thereof. Accordingly, the preferred embodiments described herein are illustrative and not limiting.

It is a perspective view by the composite type brightness enhancement film which has the diffusion particle of Example 1 of this invention. It is a perspective side view of the local by the composite type brightness enhancement film which has the diffusion particle of Example 1 of this invention. It is a perspective side view of the local by the composite type brightness enhancement film which has a diffusion particle of Example 2 of this invention. It is explanatory drawing at the time of use by the composite type brightness enhancement film which has the diffusion particle of Example 1 of this invention. It is a curve figure of the transmittance | permeability and the reflectance of a primary ray by the composite type brightness enhancement film which has a diffusion particle of Example 1 of this invention. Transmission of primary light of the composite type brightness enhancement film (curved rhomboid column unit including diffusion particles) having diffusion particles of Example 1 of the present invention and the conventional luminance enhancement film (curved rhomboid column unit including no diffusion particles) It is a curve comparison figure of a rate. It is a comparison figure of the luminance value of a horizontal viewing angle in the state where the composite type brightness enhancement film having the diffusion particles of Example 1 of the present invention and the conventional brightness enhancement film not including the diffusion particles overlap each other. It is a comparison figure of the brightness | luminance value of a vertical viewing angle in the state where the composite type brightness enhancement film which has the diffusion particle of Example 1 of this invention and the brightness enhancement film which does not contain the conventional diffusion particle overlapped twice. It is a comparison figure of the brightness | luminance value of a horizontal viewing angle in the state of single use of the composite type brightness enhancement film which has a diffusion particle of Example 1 of this invention, and the brightness enhancement film which does not contain the conventional diffusion particle. It is a comparison figure of the brightness | luminance value of a vertical viewing angle in the state of single use of the composite type brightness enhancement film which has the diffusion particle of Example 1 of this invention, and the brightness enhancement film which does not contain the conventional diffusion particle. It is a perspective view by the conventional brightness enhancement film. It is explanatory drawing at the time of use by the conventional brightness enhancement film. It is a 500-times microscopic photograph of the microscope by the composite type brightness enhancement film which has a diffusion particle of Example 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brightness enhancement film 11 Base material 11a 1st surface 11b 2nd surface 12 Curved rhombus prism unit 12a 1st inclined surface 12b 2nd inclined surface 121 Side spine 13 Diffusing particle 14 Light beam 15 Light beam 9 Brightness enhancing film 91 Substrate 92 Rhombus column Unit 93 rays 94 rays

Claims (19)

  A composite-type brightness enhancement film having diffusion particles composed of a substrate (11), a plurality of curved rhomboid units (12), and a plurality of diffusion particles (13), The first surface (11a) and the second surface (11b) are formed, and at least one curved extended curved surface is formed on the plurality of curved rhomboid column units (12), so that the light enters from the second surface (11b). At least two-dimensional refraction is caused by guiding the light beam to be generated, and the plurality of diffusing particles (13) are mixed in at least the curved rhomboid unit (12), whereby the second surface (11b) A composite brightness enhancement film having diffusing particles, characterized in that the light rays incident from the light are simultaneously diffused and formed again to exit from the curved rhomboid unit (12).   2. The composite brightness enhancement film having diffusion particles according to claim 1, wherein the diffusion particles (13) have a mixing weight ratio relative to the curved rhomboid unit (12) of between 1% and 35%.   The composite brightness enhancement film having diffusion particles according to claim 1, wherein the diffusion particles (13) are selected from an acrylic material or a glassy material.   4. The composite type having diffusing particles according to claim 3, wherein the glassy material is selected from silicon dioxide, dialuminum trioxide, boron oxide, calcium oxide, magnesium oxide, silicon resin, polyester resin or styrene resin. Brightness enhancement film.   The composite brightness enhancement film with diffusion particles according to claim 1, wherein the average particle size of the diffusion particles (13) is between 0.5 microns and 30 microns.   2. The composite luminance having diffusing particles according to claim 1, wherein the shape of the diffusing particles is selected from a spherical shape, an oval shape, an ellipse shape, an erosion shape, an oval shape or an irregular polyhedral shape. Enhancement film.   The composite with diffusion particles according to claim 1, wherein the at least one curved stretched curved surface of the curved rhomboid column unit (12) is selectively formed to have a plurality of side spines (121). Brightness enhancement film of the formula.   The curved rhomboid column unit (12) is composed of a first inclined surface (12a) and a second inclined surface (12b), and at least one of the first inclined surface (12a) and the second inclined surface (12b) is curved. The composite brightness enhancement film having diffusing particles according to claim 1, comprising a stretched curved surface.   The first inclined surface (12a) and the second inclined surface (12b) of the curved rhomboid column unit (12) are formed so as to have a plurality of side spines (121) selectively crossed. A composite brightness enhancement film comprising the diffusing particles according to claim 8.   The angle of the wave crests of the first inclined surface (12a) and the second inclined surface (12b) of each curved rhombus column unit (12) is between 70 ° and 160 °. A composite brightness enhancement film having diffusing particles.   2. A composite brightness enhancement film with diffusing particles according to claim 1, wherein each two adjacent curved rhomboid units (12) vary in surface curvature along a curved path of the same rule.   2. A composite brightness enhancement film with diffusing particles according to claim 1, wherein each two adjacent curved rhomboid units (12) vary in surface curvature along different regular curved paths.   The composite luminance with diffusing particles according to claim 1, wherein the curved rhomboid unit (12) is formed to have substantially the same vertical height relative to the substrate (11). Enhancement film.   14. A composite brightness enhancement film with diffusing particles as claimed in claim 13, wherein the vertical height of the curved rhomboid unit (12) is between 10 microns and 100 microns.   The composite brightness enhancement film with diffused particles according to claim 1, characterized in that the horizontal width of the curved rhomboid unit (12) is between 10 microns and 250 microns.   2. The composite brightness enhancement film with diffusing particles according to claim 1, wherein the curved rhomboid unit (12) is selected from UV-curing adhesives.   2. The composite brightness enhancement film having diffusing particles according to claim 1, wherein the substrate (11) is selected from flexible transparent substrates.   The composite transparent substrate having diffusion particles according to claim 17, wherein the flexible transparent substrate is selected from polyethylene terephthalate, polyethylene, polyethylene naphthalate, polycarbonate, polyvinyl alcohol, polyvinyl chloride, or a polymer compound. Brightness enhancement film.   The plurality of diffusing particles (13) simultaneously diffuse the light incident on the second surface (11b), and again emerge from the curved rhomboid unit (12), so that the primary light of the incident light The composite brightness enhancement film having diffusing particles according to claim 1, wherein the transmittance is increased from 10% to 90%.