TW200821630A - Prism sheet and optical sheet - Google Patents

Abstract

To provide a prism sheet capable of securing high brightness and a wide viewing angle characteristic while being integrated with a reflective polarization functional film. In the prism sheet 7 where a plurality of lens units 7a each having a substantially triangular transverse profile, extended in a ridge direction are arranged in parallel on at least one surface, total light transmittance when an optical beam is made incident from the outside surface of the formed surface side of the prism sheet of such a structure that the prism sheet is held between a pair of polarizing sheets arranged in crossed Nicol relation so that the ridge direction accords with the transmission axis of either polarizing sheet to the structure is set to be 2% or less of the total light transmittance of such a structure having a pair of polarizing sheets arranged in parallel Nicol relation that no prism sheet is held therebetween.

Description

200821630 IX. INSTRUCTION DESCRIPTION OF THE INVENTION [Technical Field] The present invention is, for example, a sheet and an optical sheet for use in a backlight of a liquid crystal display device, and more specifically, a side-by-side arrangement A prism sheet having a structure in which a plurality of lens units having a substantially triangular shape in a transverse cross section, and an optical sheet using the sheet material. [Prior Art]

In recent years, shirt color liquid crystal display devices have been widely used in various fields such as monitors for notebook computers, desktop computers, and liquid crystals (4). Such a liquid crystal display device includes a liquid crystal cell and a backlight. As the backlight, a structure in which a light source is disposed directly under the liquid crystal cell or an end face illumination method in which a light source is disposed on a side surface of the light guide body is known. The general structure of the night crystal display device is equipped with a rod-shaped light guide plate as a light source. (In the case of the end face illumination method, a square plate-shaped light guide plate disposed along the end portion of the lamp tube is laminated thereon. a plurality of optical sheets and a liquid crystal cell on the surface side of the light guide plate. Each of the optical sheets has an optical function such as refraction or diffusion, and specifically corresponds to a light-diffusing sheet, a sheet, or the like. 'Color liquid crystal display devices and PDP, CRT or organic EL display devices are superior in terms of less power consumption. However, the front side brightness is low, and the purpose is to improve the optical efficiency by backlighting. ^ The power consumption increases the front brightness. As a lens unit for a enamel sheet, it is generally considered that the following is suitable for improving the brightness. The cross-sectional shape is the apex angle, that is, the angle formed by the oblique side is 90. . Further: the dihedron is preferably a sharp shape in which the radius of curvature of the top of the lens unit is 〇'. P ’ top

The prism sheet having the lens unit of such a shape is excellent in the function of causing the incident light from the backlight to be punctured by the refraction, on the front surface, and from the lens surface, and the function of the b and b is reflected. The reversion function can be used to make the white north stop by the refraction. The first is that the hunting light from the use of the restored light will not help to improve the front brightness = she reuses. However, there is a problem that a half-value wide household can be obtained; a brightness range of 5 〇% of the surface brightness is narrowed, and a viewing angle is particularly reduced by 0 1 , that is, a radius of curvature of the top of the lens unit of the enamel sheet When it is 0, that is, when the top is sharp, since the emitted light from the backlight at the top cannot be diffused outside the front direction, the viewing angle characteristics are liable to lower. '" Further, in the above optical system, when the light emitted from the self-twisting sheet is incident on the liquid crystal cell, the amount of transmitted light is halved by the absorption of the polarizing plate and only half of the light passing through the liquid crystal cell is The viewer's vision is useful. 'The reality is that about three-quarters of all light becomes optical loss. In order to improve the optical efficiency, the light efficiency is further improved. In the following Patent Document 1, the following configuration is disclosed: The front surface luminance is improved by integrating a prismatic lens material having a light collecting function and a reflective polarizing function film. According to the literature, the light component that is about three-quarters of the above-mentioned loss is returned to the backlight side by a redundant-type reflective polarizer (reflective polarizing function film), and H60B.doc 200821630 is in a polarized resentment machine. On the basis of the re-circulation, the amount of light is increased by about 70% by this recycling. However, in the configuration of the optical system disclosed in Patent Document 1, the positional relationship of the prism sheet with respect to the reflective polarizing function film can be used. On the upper side (the liquid crystal cell side, Fig. 10 of the document), it is also possible on the lower side (backlight side 'far document' Fig. 13). However, in the case of the lower side configuration, it is difficult to integrate with the reflective polarizing function film, and it is necessary to use a working step of laminating other parts. On the other hand, in the case of the upper side configuration, there is the advantage that The simplification of the assembly step can be achieved by integrating the non-facet of the enamel sheet with the reflective polarizing functional film. However, it is clear that there are problems as described below in the case of the upper side. In other words, the conventional enamel sheet is made of the following structure: - an ionizing radiation-curable acrylic resin is cast on a enamel mold, and further, polyethylene terephthalate as a base material is laminated, and these are integrated. Hardened, it is clear that the effect of the polyethylene terephthalate substrate that is not causing the problem in the underlying structure and the synergistic effect of the excessive concentrating function of the enamel sheet will result in P cattle under the front brightness and It means that the half value width of the field of view angle of 50% of the front shell can be obtained. In particular, due to the recent large size of the liquid crystal screen, the latter problem is exposed in the case where the visual range is away from the front of the screen. The purpose of the present invention is to provide a enamel sheet which is more integrated with the illuminating brightness and wide viewing angle characteristics than the above-mentioned prior art, and which uses the II60I3. .doc 200821630 Optical sheet of sheet metal. The cymbal sheet # of the present invention is characterized in that a plurality of lens units having a substantially triangular cross section and having a ridge line extending in a direction orthogonal to the cross section are juxtaposed on at least the surface, and are defined as follows. Τι, τ2 satisfy the formula 1, Τ1^Τ2χ〇·02·" (1) In the formula (1), ΤΙ and Τ2 have the following meanings. Τ1 is a total light transmittance when light is incident from one side of the plurality of lens units on the side of the sheet material as described below, and the laminated structure is arranged in a crossed Nicols relationship - the above-mentioned enamel sheet is sandwiched between the polarizing plates 2 such that the extending direction of the ridge line of the lens unit coincides with the transmission axis of any of the polarizing plates Τ2: including the 稜鏡 sheet not sandwiched and configured to be parallel One of the Cole relations is the total light transmittance of the laminated structure of the polarizing plate. Preferably, in a specific aspect of the sheet material of the present invention, the shaping ratio of the plurality of lens units is set to be in the range of 5 〇 to 9 〇 %, and more preferably The good is set to 60~80. / Range of 〇. In other specific aspects of the tantalum sheet of the present invention, the tantalum sheet comprises a transparent resin for photons, which is produced by a hot melt extrusion method. In still other specific aspects of the enamel sheet of the present invention, the apex angle of the lens unit is set to 7 Å. ~11〇. The scope. Further, in other specific aspects of the cymbal sheet and the material of the present invention, the distance between the adjacent tops of the lenses, i.e., the pitch, is set to be in the range of 2 〇 to 1 〇〇 ^ (f). 116013.doc 200821630 The enamel sheet of the present invention is further loaded with Yangmu &&&

A thickness of 150 μm is disposed under the reflective polarizing film, the lens unit spacing is 50 μm, and the apex angle is 90. And the standard enamel sheet having a forming ratio of 95% or more is such that the front surface brightness of the ruthenium facing the reflective polarizing functional film is set to A, and the enamel sheet is disposed above the reflective polarizing functional film.

Let the non-稜鏡 face to reflect the 偬 .. shout can give ΛΑ τ _ ^ I

In still other specific aspects of the enamel sheet of the present invention, a thickness of 150 μη1, a lens unit pitch of 50 μm, and an apex angle of 90 are disposed under the reflective polarizing film. And a standard enamel sheet having a forming ratio of 95% or more, wherein the half value width of the front luminance when the ruthenium faces the reflective polarizing functional film is set to X, and the ruthenium sheet is disposed above the reflective polarizing functional film. The half value width reduction rate obtained by {(χ_γ)/Χ}χ1〇〇 is set to γ when the half value width of the front luminance when the non-稜鏡 surface is applied to the reflective polarizing function film is γ. Less than 3%. The optical sheet of the present invention comprises the enamel sheet of the present invention; and a reflective polarizing functional film which is then applied to the opposite side of the forming surface of the enamel sheet on which the lens unit is formed. [Effects of the Invention] In the enamel sheet of the present invention, the cross-section is provided on at least one side in a horizontal direction of n60I3.doc -10·200821630. The cross-section is substantially three-folded and strong, and the ridge line is orthogonal to the cross-section. In the structure of the plurality of lens units, the ratio T1/T2 of the upwardly extending total light transmittance Τ2 is set to 〇〇2 or less, so that it is clear from the above-described embodiment that even if __ is described below, P is integrated. The reflection of the polarized function is on the side of the side of the thin side. It can also be accompanied by the ancient selection of 7 Γ J 保 保 网 冗 及 及 及 及 及 及 冗 冗 冗 冗 冗 冗 冗 冗 冗 冗 冗 冗 冗 冗 冗

In the light and material towel of the present invention, a reflective polarizing film is provided on the side opposite to the shaping surface of the sheet of the present invention, so that high brightness and wideness can be ensured when using the liquid crystal display device. Perspective characteristics, and

By using - as a part to operate, it can contribute to the simplification of I. [Embodiment] Hereinafter, a specific embodiment of the present invention will be described with reference to the drawings, and before the stencil sheet of the embodiment is described, the stencil sheet using the embodiment is schematically shown in FIG. The basic structure of the liquid crystal display device. The liquid crystal display device shown in Fig. 1 includes a liquid crystal cell 1 and a direct type backlight 2. On the top and bottom of the liquid crystal cell 1, a polarizing plate la&lb is attached. The backlight 2 has a light source 3. On the upper surface of the light source 3, a diffusion plate 4 for diffusing light from the light source 3 is fixed. On the diffusion plate 4, as shown, a diffusion sheet 5 having a diffusion function, a reflective polarizing function film 6, and a enamel sheet 7 are laminated in the moonlight 2, and light from the light source 3 passes through the diffusion plate 4. And incident on the diffusion 1160I3.doc 200821630 sheet 5. The light incident on the diffusion sheet 5 is diffused and discharged from the entire upper surface of the diffusion sheet 5. The light emitted from the diffusion sheet 5 passes through the reflective polarizing film 6, and is incident on the enamel sheet 7, and is emitted from the upper surface of the enamel sheet 7 with a peak intensity distribution in a substantially upper direction, illuminating the entire The liquid crystal cell 1 sheet 7 has a configuration in which a plurality of lens units 7 &, h extending in a convex shape in one direction are arranged side by side on the sheet-like body. Hereinafter, the upper surface of the lens unit 7a is also referred to as a shaping surface. Specifically, as shown in a partial cross-sectional perspective view of Fig. 2(a), the lens unit has a substantially equilateral triangle shape in a cross section of 7a, and has a ridge line extending in a direction orthogonal to the cross section. In the present embodiment, the total light transmittance T1 is normalized by the total light transmittance 仞 having a structure in which the polarizing plate is disposed in a state in which the sheet is not sandwiched and the polarizing plate is disposed. Τ2 is set to 〇〇2 or less, and the above-mentioned total light transmittance is D! In the configuration in which the 稜鏡 sheet 7 is sandwiched between the polarizing plates and the ridge line direction of the lens unit is aligned with the transmission axis direction of any one of the polarizing plates, The total light transmittance when light is incident on the shape side. When Τ1/Τ2 exceeds 0.02, the brightness drop due to optical rotation or discrete light becomes large under the integration of the reflective polarizing film (4). For example, when it is mounted in a liquid crystal display device, sufficient brightness cannot be obtained. ...like. The above-mentioned standardized transmittance is related to the optical shape of the thickness direction of the film, that is, the thickness direction of the film, and in the present invention, the above-mentioned standardized transmissive material (4)/T2# is set to 0, which is better. It is set to _ H6013.doc 200821630 or less, so it can ensure a larger viewing angle and higher brightness. Further, in the present embodiment, the apex angle e of the equilateral triangle shown in Figs. 2 (4) and (b) is preferably 70 to 11 Å. The scope. Deviation from this paradigm ensures sufficient brightness. Further, the distance between the tops of the adjacent lens units 7a and 7a, i.e., the inter-groove Δw ' is preferably set within the range of 2 〇 to 1 〇〇 _. If it is less than μπ^', it is difficult to manufacture in reality. If it exceeds 1 〇〇 (4), the Japanese may cause interference with the pixels of the liquid crystal cell or the color filter to cause moiré: ^ ^ In the present embodiment, 'is to increase the half value width and expand the angle of view, and the range is light (four) to 9 ()%. Here, the shaping rate is a ratio of the actual height of the lens unit 〜 to the height of the lens unit ～ when the radius of curvature of the top is 〇. Further, if the shaping rate exceeds 9 G%, the front luminance becomes high, but the half value width _ becomes smaller, and the viewing angle is narrowed; when the forming ratio is less than 5 〇%, the viewing angle is:: However, the brightness may be lowered. Therefore, when the above-mentioned shaping rate is in the range of 5 〇 to 9 〇%, the front luminance is relatively high, and the half value width is large, and a sufficient viewing angle can be realized; when the above shaping rate is in the range of 6 〇 to 8 〇 % In the meantime, high brightness and wide viewing angle characteristics can be further ensured. Since i 曰 has a large half-value width and can expand the viewing angle ′, the radius of curvature of the top portion of the lens unit 7 is preferably set to a range of 2 to 1 。. Further, the half-value width and the extended angle of view of the private unit are applied, and the surface roughness is applied to the inclined surface portion of the lens unit. Preferably, the average roughness Ra value of the claw surface is used to give W~5 _ or less. Μ14Μ. 116013.doc -13· 200821630 When the surface roughness Ra is in the range of 〇1 to 5 μηη, the front surface can be sufficiently improved. If the surface roughness Ra exceeds 5 μm, the front brightness may become low. More preferably, it is set to a range of 〇β3 to 4 μm, whereby the front luminance can be further improved. Furthermore, a thickness of 15 〇 will be placed under the reflective polarizing film.

Km, the lens unit is 5〇pm, the apex angle is 9〇〇, and the standard 稜鏡 sheet 7 is 95% or more, so that the front surface brightness when the 稜鏡 is facing the reflective polarizing film is set. A, and the enamel sheet 7 is disposed above the reflective polarizing function film so that the front 売 degree of the non-稜鏡 facing reflective polarizing function film is set to B, preferably based on {(AB) /A} XI Seto's front brightness reduction rate C is set to 5% or less, thereby ensuring a high front brightness, and a structure in which the enamel sheet is disposed on the backlight side of the reflective polarizing film can be realized. It is also inferior to the positive brightness. Further, a thickness of 15 Å is disposed under the reflective polarizing film, the lens unit spacing is 5 、, and the apex angle is 9 Å. And the standard enamel sheet 7 having a forming ratio of 95 〇/〇 or more, such that the half value width of the front luminance when the 稜鏡 faces the reflective polarizing functional film is set to χ, and is disposed above the reflective polarizing functional film. When the half sheet width of the front sheet when the sheet 7 is made to face the reflective polarizing film is γ, it is preferable to obtain it according to {(XY)/X}xl〇〇. The half value width reduction rate ζ is set within 3%. Thereby, a large half-value width can be ensured, and the front luminance which is not inferior to the structure in which the enamel sheet is disposed on the backlight side of the reflective polarizing functional film can be realized. In the present invention, the above-mentioned enamel sheet may be composed of a single resin, or may be composed of a plurality of resins, but it is preferably formed of a single layer. Further, the thickness of the sheet material of the enamel sheet is preferably 50 to 300 μm, more preferably 50 to 250 μm, and further preferably 1 to 25 〇 μη. When the thickness is less than 50 μm, curling is likely to occur on both sides of the lens unit 7& and when the thickness exceeds 300 μm, the transfer rate of the resin by the shaping is lowered, and the brightness may be lowered. As a method of producing the enamel sheet 7, for example, a melt extrusion method or a casting method may be employed. Alternatively, it may be formed by molding a pattern on the surface of a stamping die which is engraved with a pattern having a substantially inverted shape. The method, the method of forming by injection molding, and the like. As a method of roughening the bevel shape of the crucible shape, a method of imparting roughness to the surface of the press mold by sandblasting, or transferring the surface of the press mold by lithography, etching, plating, or the like is given. Roughness and transfer method. In view of the accuracy of the shape of the crucible and the viewpoint of the manufacture of the press mold, it is preferred to apply a treatment to the surface of the press mold to impart roughness. Further, in the present invention, the enamel sheet is a transparent resin for optical use, and when it is produced by a hot melt extrusion method, high brightness can be further achieved, and the hot melt extrusion method can be easily and accurately performed. Forming a shaped surface to obtain sufficient display quality. In the above-described melt extrusion method, as shown in the schematic configuration diagram of FIG. 3 or FIG. 4, the molten resin is extruded into a sheet shape by the Τ-type molds 11, 21, and the shaped pro 12, 22 and The metal is elastic, and the deforming roller 13 or the metal roller 23 is nip. After the nip, the enamel sheet blank is rapidly cooled to the glass transition temperature of the resin to be lower. Then, the enamel sheet material is cooled by the first and second annealing rolls 14, 24, 15, 25 having a mirror surface and having a temperature adjustment of 116013.doc -15-200821630, thereby preventing curling or Remove residual deformation due to thermal stress. Thereafter, the sheet bundle is wound by the winders 16, 26. Further, as the nip roller, a metal elastic deformation type t*13 was used in the apparatus shown in Fig. 3, and the metal roller 23 was used in the manufacturing apparatus shown in Fig. 4, and the other structures were all the same. —/ f ,Γ I~乱/夂网乳

When the temperature at the temperature near the Tg of the glass transition degree is 4, 24, 15, and 25, the molecular alignment occurs in the flow direction of the resin, so that the optical distortion in the surface of the film becomes large. Therefore, it is desirable that the cooling temperature after the nip is set to be more than 2 rc lower than the glass transition temperature Tgfel〇t: above. Thereby, the action of the resin can suppress the molecular alignment in the flow direction. As long as the tantalum sheet is produced by the dazzling method as described above, the optical deformation in the film surface can be reduced without special manufacturing steps. However, 'the cooling after the above-mentioned clip house. Compared with the metal in the device shown in Fig. 4: It can be more effectively used when using the elastic deformation (4) of the metal shown in Fig. 3: Widely used in the use of metal elastic deformation rolls In the case of 13, the time of clamping is longer than that of the metal roll 23, so that the cooling effect on the resin is increased. If the tree is made of a metal elastic deformation roller 13 and the tree is obliquely k-shaped, the stress applied to the tree raft by shaping is slowed down in the seed (10)-* < - Curing, so that the lead lens remains in the 7G portion due to the residual, and it is generally considered that the thickness in the thickness direction becomes large. Residual deformation. Thus, the case of manufacturing the enamel sheet 6 using the apparatus shown in Fig. 4 and the case of manufacturing using the apparatus shown in Fig. 1160I3.doc 200821630 3 are advantageous in reducing the optical deformation in the thickness direction. In addition, the material of the enamel sheet of the present invention is not particularly limited, and a resin excellent in transparency and moldability is preferable, and examples thereof include a polycarbon-based resin and a thermoplastic saturated norbornene-based resin. \再再' as a case of 'polycarbonate g' (4) is obtained by interfacial polymerization or dazzling fusion & The molecular weight of the polycarbonate resin is preferably a viscosity average molecular weight _〇, 〇〇〇~100, _, more preferably 15, _~35, _. A polycarbonate resin having such a viscosity average molecular weight can obtain sufficient strength, and is preferable because it has good melt fluidity at the time of molding. The thermoplastic saturated norbornene-based resin may, for example, be: (4) if necessary, the ring-opening polymer or the ring-opening copolymer of the norbornene monomer may be added with maleic acid or cyclopentadiene. After the modification, the chlorine-containing resin yb) is added to the norbornene-based monomer to polymerize the resin; (4) the ice-reducing, the flaky monomer is added to the olefin-based monomer such as ethylene or a hydrocarbon. Tree month: (d) a resin obtained by adding a norbornene-based monomer to a cyclic hydrocarbon-derived monomer such as cyclopentene, cyclooctyl, 5,6-dihydrodicyclopentanyl, and the like A modified product of a resin or the like. As the above-mentioned thermoplastic saturated norbornene-based resin, the product name "ZE 〇", "zE 〇 」" from Sakamoto Co., Ltd., and the product name "ART (10)" from the clothing company are listed, and it is from Mitsui Chemicals Co., Ltd. The product name is "APEL". If the number average molecular weight of the plastic saturated norbornene-based resin is smaller than 116013.doc -17-200821630, the mechanical strength may be insufficient. If it is large, the film formability may be lowered. Therefore, by toluene or appropriate The gel permeation chromatography is carried out by a solvent, and it is preferably 25,000 ~looooo, more preferably 〇〇80,000. When the norbornene-based resin is used, the melt fluidity at the time of molding is also good, which is preferable. Further, in the optical sheet of the present invention, on the surface opposite to the surface on which the lens unit is formed, the reflective polarizing film is provided, but the reflective polarizing film is not provided as long as its function is achieved. For example, it may be formed by alternately laminating two transparent resins, for example, a configuration of several hundred layers. (Examples and Comparative Examples) As the resin materials used in the crucible sheets of Examples 1 to 4 and the crucible sheets of Comparative Example 3, polycarbonate resin (Teijin Chemicals Ud) can be used. ,α, ΐρΐ^ηΐΜ-1225L)] 〇• The ruthenium sheets of Examples 1 to 4 were produced using the manufacturing apparatus shown in Fig. 4. The crucible plastic 21 was set to have a face length of 700 mm, the metal roller 23 was set to have a diameter of 250 mm, and the surface was mirror-finished, and the annealing roller % and the second annealing roller 25 were set to have a diameter of 25 〇. Mm with a mirrored surface. Further, the following is used as the shaping roller 22 having a diameter of 25 mm and having a plurality of V grooves having a substantially right-angled equilateral shape on the outer peripheral surface, and is implemented by Table 1. Surface treatment by the described processing method. The size of the enamel sheet bundle wound by the winder 26 is 116013.doc 200821630 650 mm and a thickness of 150 μm. The basic conditions are as follows. After the molten resin is extruded into a sheet shape by a squeegee molding die 21 at a pressing amount of 100 kg/hr, the forming roller 22 and the metal roller 23 cooled to 1 〇 ° C are subjected to a central pressing force to make a rib. After the temperature of the lens material blank is below the glass transition temperature Tg, it passes through the first annealing light 24 at 13 5 ° C, and immediately passes through the second annealing roller 25 of 95 and is wound by the winder 26 Wrap around. At this time, the speed of the roller of the winder 26 was set to 26 m/min, and the speed ratio between the rolls was set to 1.0. Further, the nip sheets of Examples 1 to 4 were produced under the above specific conditions by changing the nip pressure. The tantalum sheets of Comparative Examples 1 to 3 were produced using the production apparatus shown in Fig. 3. The production conditions at this time are the same as in the first embodiment except that the above specific conditions are excluded. Then, the shape conditions of the tantalum sheet 6 of Examples 1 to 4 and the tantalum sheets of Comparative Examples 1 to 3, i.e., the groove pitch, the apex angle θ, and the forming ratio are as shown in the following Table i. The tantalum sheet blanks of Examples 1 to 4 and Comparative Example 1 produced as described above were cut into specific lengths, and T1/T2, forming ratio, and bevel roughness were measured. Further, on the enamel sheet obtained by the dicing, an adhesive is used, and the polarizing transmission axis of the reflective polarizing film is aligned with the ridge line direction of the enamel sheet to laminate the Minnesta Mining & Ma_facturing company. A DBEF (Dual Brightness Enhancement film having a thickness of 130 μm) was produced as a reflective polarizing functional film, and the front luminance and the half value width were evaluated in the state of the obtained laminate. The results are shown in the following Table i. 116013.doc -19- 200821630 Further, each item is measured according to the method described in the following (1) to (5). (1) T1/T2 makes the transmission axes of the two polarizing plates orthogonal (the transmission axis of the polarizing plate is horizontal and the transmission axis of the other polarizing plate is vertical), and the film is sandwiched between the polarizing plates. The material was measured such that the ridge line direction was the vertical direction, and the total light transmittance η when the light beam was incident on the self-formed surface was measured using a tachometer [Tokyo Denshoku Co., Ltd., C-HIII DpK]. . Further, the total light transmittance of the structure including a pair of polarizing plates which were arranged in a parallel Nicols (the transmission axes of the two polarizing plates were perpendicular) were measured as Τ2. In Table 1, it is indicated that there is. Indicates the value of 1/72, which is the value of (Tl/T2)xl〇〇(%). (2) The forming rate is coated with carbon on the cross section of the enamel sheet cut by the microtome, and a scanning electron microscope (S-43〇〇se/n) manufactured by 曰立株式会社有限公司 is used to observe the profile. The groove pitch a, the height h, and the vertex angle 1 shown in Fig. 2(b) are shown. Based on the equivalent value, the shaping rate is obtained by the following formula. Forming rate=h/{(AW/2)tan(9O, 0/2)} (3) Slope roughness The prism shape was measured using a scanning laser microscope (1LM21W) manufactured by LASERTEC Lasertec Corporati〇n, and used. The data analysis software calculates the surface roughness (Ra) of the bevel. (10) An average of 2 piles at intervals of μιη is calculated and calculated by an average of 5 piles at a distance of 50 μm. (4) The front brightness is in the direct type backlight of the commercially available 2G 忖 LCD TV. The group is cut into the 116013.doc -20. 200821630 The length of the male is 300 mm, the horizontal length, and the .. The layer of the object and the reflective film of the reflective polarizing film are such that the ridgeline direction of the lens becomes the left-right direction of the face (level ^

, direction), the front brightness was measured by the liquid crystal cell using a KONICA MINOLTA Konica Minilta metric, left-system k light meter Light Meter LS-100. (5) Half-value width The half-value λ degree is a range of viewing angles at which 50% of the luminance of the normal direction of the affixed face is obtained. The setting ^ ^ X is the structure disclosed in the above item, and the receiving juice is installed on a platform that can be moved in the horizontal direction of the oyster ten, at -70 in the horizontal direction. Within the range of ~7〇〇, the scale of 5 is used to measure the brightness, and the printer is used to print out the gentleman's main one, eight, ·, fruit. The results of the listed prints are plotted, and the brightness of the s s is the angle of the front brightness. In order to investigate the influence of the optical enamel shape of the enamel sheet, (4) front brightness and the value of the 'value show' will be made using the manufacturing apparatus shown in Figure 4 with a distance of 50 μηι and a vertex angle of 9〇. 〇, Φ 于 员 员 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 Brightness and half value width are used as reference values. In other words, the luminance and the half-value width which are actually measured as described above are obtained with respect to the luminance and the half-value width as the reference value, and are shown in the following table. The rate of decline is equivalent to the half-value width = Ζ (%) obtained by the above-mentioned {(A Α Α χ χ 所 所 ( ( ( ( ( ( ( ( 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 Thousands 116013.doc 200821630

韵· ο -3.6 inch v〇Os Ο 12.8 10.6 VD rn U-) νο ο Γ^ inch 00 vd CO 〇〇o ο ο Ο ο o in 〇t < g Η rn τ*·Η. VD rH τTM ^ g Τ""*^ ui On 病04曰(Ν Ο) ^Η in OS rn Os SS ON 00 § r4 〇\ s 〇ΓΠ inch inch Γ〇ΓΠ r〇 inch# Μ B =L 4 lacquer inch Ο CN ^n CN wn CN ir^ r4 inch ο % Η PP , ♦ ♦c Μ Φ shaping rate Ο O) o inch CN ι—Η 00 ν· < 卜 (N |〇JQ oi C\ SS (Ν fc: ON ON 1 2.48 1 - 1 卜 S < - Ο 〇 · · 梦 梦 〇 〇 OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS Table ♦ ♦ ♦ iC - g jl3 - D 1160I3.doc -22- 200821630 As shown in Table 1, it can be seen that the sheet 7 of Example 丨4 can be compared with the sheet of Comparative Examples 1-3. Make T1/T2 smaller to ensure higher The surface brightness is improved by setting the forming ratio to 5 〇 to 9 〇 % to ensure a wide half-value width. It is also known that Τ 1 / Τ 2 is 2% or less, and it is preferable to make The shaping rate is 50 to 90%. Thus, the brightness reduction rate c can be controlled within 5%, and the half value width reduction rate Ζ can be controlled within 3%, even if the structure of the previous sheet is disposed on the lower side. In contrast, the sheet material 7 of the embodiment 丨4 can obtain display performance which is not inferior to the color. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exploded perspective view schematically showing a liquid crystal display device using the enamel sheet of the present invention. Fig. 2 (a) and (b) are a partially cutaway perspective view and a partial cross-sectional front view showing a part of a enamel sheet according to an embodiment of the present invention. Fig. 3 is a schematic block diagram showing a manufacturing apparatus for manufacturing a crepe sheet as a comparative example of the present invention. Fig. 4 is a schematic structural view showing the arrangement of the enamel sheet of the embodiment shown in Fig. 2, which is not used for the garment. [Main component symbol description] 1 Liquid crystal cell la, ik b Polarizing plate 2 Backlight 3 Light source 4 Diffusion plate 116013.doc -23- 200821630

5 Diffusion sheet 6 Reflective polarizing function film 7 稜鏡 Sheet 7 a Lens unit II6013.doc -24-

Claims (1)

200821630 X. Patent application scope: 1 . A enamel sheet characterized in that a plurality of lens units having a substantially triangular cross section and having a ridge line extending in a direction orthogonal to the cross section are juxtaposed on at least one side. , Τι, T2, which is defined below, satisfies the formula 1: T1ST2X 0.02 (1) where T1 is a laminated structure in which light is incident from one side of the prism sheet on which one of the plurality of lens units is provided The total light transmittance is such that the laminated structure is sandwiched between the pair of polarizing plates arranged in a crossed Nicols relationship such that the ridge line of the lens unit extends in any direction and any polarized light The transmission axis of the plate is uniform; T2: the total light transmittance of the laminated structure of the polarizing plate, which is not sandwiched by the above-mentioned enamel sheet and arranged in parallel Nicols. 2. The sheet of claim 1, wherein T1 and T2 satisfy the following formula 2: ΤΙ $Τ2χ〇·〇ρ" (7). 3. The sheet of the requester, wherein the shaping ratio of the plurality of lens units is set in the range of 50 to 90%. 4. If requested! In the sheet material, the above-mentioned forming ratio is set to 6 〇 to 8 〇%. The prism sheet of the ruthenium sheet is made of optical transparent yttrium and is produced by a hot melt extrusion method. The prism sheet of Shiming 1 is set to 70 in the cross section of the cross section of the mirror. ~110. The scope. The sheet of item 1 is sought, wherein the distance between the top 116013.doc 200821630 of the adjacent lens unit, that is, the pitch is set to be in the range of 20 to 100 μπ12. 8', wherein the surface roughness of the bevel portion of each of the lens units is set to be in the range of 0·1 to 5 μm, based on the surface roughness Ra value in the JIS standard. 9 · The sheet according to item 1, wherein a standard rib having a thickness of 150 μm, a lens unit pitch of 5 〇 μηη, an apex angle of 90, and a forming ratio of 95% or more is disposed under the reflective polarizing film. The lens material is such that the front surface brightness when the enamel faces the reflective polarizing function film is A, and the enamel sheet is placed above the reflective polarizing function film so that the non-稜鏡 surface faces the reflective polarizing function film. When the front brightness is set to B, by {( △ ^ " △ ^ ^ (^ 求 求 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面 正面A standard enamel sheet having a thickness of 150 μm, a lens unit pitch of 5 〇μηη, an apex angle of 90, and a forming ratio of 95% or more is disposed under the film so that the 稜鏡 faces the reflective polarizing film. The half-value width of the front luminance is set to X, and when the half-value width of the front luminance is set to γ when the 稜鏡 sheet is disposed above the reflective polarizing function thin film so that the non-稜鏡 surface faces the reflective polarizing function film, By {(Χ_Υ)/Χ}χ100 The obtained half value width reduction rate B is 3% or less. 11. An optical sheet comprising: a sheet material according to any one of the claims; and a reflective polarizing function film, which is followed by the edge The lens material is formed on the opposite side of the shaping surface of the lens unit. 116013.doc