TW200835940A - Light diffusion sheet and method of manufacturing the same - Google Patents

Abstract

A light diffusion sheet is manufactured by copying a shape of an uneven mold. The sheet includes an area A and an area B. In the area A, a lens section including decreasing prisms is disposed on one end of a body of the sheet. The area B is outside the area A. In the area B, at least a portion of the sheet is a blast mat structure made by means of a surface roughening process.

Description

200835940 IX. Description of the Invention: [Technical Field] The present invention relates to a light diffusing sheet and a method of manufacturing the same. In particular, the present invention relates to a light diffusing sheet suitable for constituting a surface light source device and a manufacturing method thereof, which can be used as a backlight of a liquid crystal display device. [Prior Art] As an optical sheet for an optical device, there is an optical sheet described in, for example, Japanese Laid-Open Patent Publication No. 001-297615 (Patent Document No.). However, such an optical sheet has the following technical problems: (1) In a matrix-by-slice matrix printing, productivity is low, resulting in an increase in manufacturing cost; (2) a glare phenomenon due to high directivity light emitted by the light deflecting element; (3) If the light scattering caused by the dot matrix is enhanced due to the decrease of the bright line near the light entrance portion, the dark line adjacent to the bright line may be seen very clearly, resulting in a quality problem; (4) Straight less than 50 μm In point matrix printing, it is actually difficult to perform precise coating, and there are many clogging, which causes a significant drop in yield. (5) If the diameter of the dot exceeds 1〇〇μηι, it may be gradually gradient (taken also (10)) Areas with low pull can be printed, resulting in reduced display quality; , (6) using LED (light emitting diode), or CCFL (Cold Cathode Fluorescent Lamp) When the primary light source is used, the countermeasure against the dark line of the bright line is insufficient. In the meantime, it is an object of the present invention to solve the above-mentioned technical problems and to produce a high-yield and high-yield and inexpensive product. Light diffuser.

Further, another object of the present invention is to provide a very high quality backlight device which does not degrade the display quality while effectively eliminating the bright line/dark line' and suppresses the generation of glare. [Means for Solving the Problems] As a solution to some of the above problems, there is provided a light diffusing sheet which has a light diffusing function which is manufactured by transferring a shape of a concave-convex mold, which is characterized in that the optical sheet has a region a and region b, in the region A, the lens portion is disposed at the end of the optical sheet, and the region b is at least partially roughened except for the region A.

Patent Document 1: [Invention] In one aspect of the invention, the lens portion extends from one end of the optical sheet. In the morphism of the present invention, the lens portion includes a plurality of protrusions whose height decreases from the end to the other end. In the first aspect of the invention, the lens portion includes a plurality of protrusions which are reduced in height from the optical 2 = end to the other end and have a substantially triangular cross section. In the second aspect of the invention, the lens portion includes a plurality of protrusions, and the protrusions are protrusions having a substantially constant height from one end to the other end of the tablet, and having a substantially triangular shape, and a protrusion having a reduced height and a slightly triangular cross section. Integrated. In one aspect of the invention, the lens portion includes a plurality of protrusions of a multi-stage reduction type, and the structure of the multi-stage reduction type protrusion is substantially constant from the end of the optical sheet 6 200835940 to the other end. a protrusion having a slightly triangular profile with a reduced golden south and a slightly triangular profile, and a protrusion having a reduced height and a slightly triangular profile, with the face of the protrusions from the end of the optical sheet The other end is reduced in a way that is connected. In the aspect of the invention, the lens portion includes a plurality of sections which are slightly elliptical from the one end of the light diffusion sheet to the other end. In the aspect of the present invention, the lens portion includes a plurality of substantially trapezoidal projections having a reduced cross-section from the end of the light-diffusing sheet. In the case of the present invention, at least the postal or valley portion of the lens portion and the invention of the silk surface are below the lens portion = ff匕. In the aspect of the invention, the surface secreting portion has a flat angle of 1 to 30 degrees. In order to solve a number of problem-solving problems, a light diffusion function-providing prior art piece is provided with a light diffusing function. The silk diffusing property (four) is characterized in that the optical sheet has at least - and the surface roughness starts from the end portion. The area that changes slowly continuously, the three areas outside the area and the surface roughness is roughly defined.

Rmr 触 仏, or rake roughness # 贞 长度 length ratio In one aspect of the invention, the above region, the inclination 仏 is 5 to 35 degrees (preferably! value. In one aspect of the invention, the load length ratio Rmr (50%) of the region A 乂 having a roughness curve is 4 〇 to 8 〇 % (preferably 50 to 75%, more preferably 60 to 70%). ): 7 200835940 Value. In one aspect of the present invention, the average coarse roundness of the above-mentioned area is 0.75~3 _ (the better day 'one part f has at least part of the calculation area A has 10 points of flat two f sound one/L, In the above-mentioned region 5. 〇^15 μιη , ^ 4 3·^20 μΠ1 - in the above-mentioned region, the above region Α = ^ ^. The average interval S of the hair 参 is less than or equal to 35_(;; eight = local peak flat Preferably, the spacing sm between the concavities and convexities of the crucible to the boring tool is less than Γ Γ ° ° ° ° , , , , , , , , , , , , , , , , _ _ _ _ _ _ _ _ _ 广 广 广 广 广^='The average of the local faculty is ~3〇μπ〇, or the spacing between the bumps is 1〇~= preferably 10 is 20~90 _, more preferably 2' (better in the above area B) The average dip angle is two ": in the art pattern of tomorrow, preferably 2 to 8 degrees." The good ^^.5 of the present invention is called the degree of 算术, the arithmetic mean of the domain 粗 rough = the secret of the above section ~ 1.] Teacher, the better is 03 = yang (better 0.2 2: degree = 3⁄4 ' move 0' haze value is large (preferably greater than or equal to, temple at 3G /. (better is greater than Equal to 3 outside 0 'more 8 200835940 Good is greater than or equal to 40%). The total light transmittance of the present invention - is greater than or equal to 90% (preferably, the upper region + diffuse transmittance is greater than or equal to 25% (preferably at (10) = good = is greater than or equal to 35%). / 〇, a better aspect of the invention, the wire-hardened resin shaft of the above light-diffusing sheet. The state-of-the-art, °-line-hardened resin is compared to G.CU~ please (the material has an average with the tree The particle size is 4~1G_ 疋(10)~M7) The difference in refractive index and in one aspect of the present invention, the sticking function of Shang Cheng. 31 Zhengzheng has anti-adhesive on the back. , is an end-illuminated surface light primary light source; a light guide body, the light source and the light guide light are emitted; the light deflecting element is arranged such that the light from the light guide body enters the light; and the upper diffuser is In the aspect of the present invention, the light-diffusing sheet configured by arranging the above-mentioned _ 于 on the side of the money source is disposed in such a manner that the light deflecting element (four) is cut and lighted. The above-mentioned primary light source is LED money. In the aspect of the present invention, a person who uses the primary light source light of the above-mentioned guide wire in the upper light domain A is used. The light diffusing sheet having a thickness of 2 to 3 G times is used. In the aspect of the invention, the total reflection type deflecting film and the diffusing sheet are used for the surface light. Further, the present invention solves some of the above problems. Providing a light 9

Further, the present invention provides a method for producing a light-diffusing sheet, which uses a rib having a center particle diameter of 38 μm or less (preferably 20 or less, more preferably 15 μm or less) as a solution to the above problems. The non-spherical particles are sprayed on the surface of the metal roll mold to obtain a fine concavo-convex structure, and the fine concavo-convex structure is transferred and cured on the transparent substrate using ultraviolet curing resin to obtain at least eight of the above-mentioned light diffusing sheets. Part of the area. 200835940 -----I--- The method for manufacturing the diffusion sheet, using a center particle diameter of 5 to 10 to 40 μm, more preferably 5 to Μ 乂 乂 乂 ) Π Π ) ) ) ) ) ) ) ) ) ) ) ) The roll-shaped mold j, H_aStmg) is processed to obtain a fine uneven structure, and the outer-side hardening resin is used to pass the fine irregularities thereon to obtain a further (four) B substrate. The present invention provides a light-emitting sheet as a solution to some of the above problems. The method is to use a particle having a center particle diameter of 3 () to (10) _ (better = 5 to 15 G, more preferably 63 to 125 _) to treat the surface of the metal roll core to obtain a fine uneven structure. The outer wire is made of a resin to transfer and harden the fine uneven structure to the transparent substrate to obtain a part of at least the region A of the light-diffusing sheet. In one aspect of the present invention, fine particles composed of 1 to 20% of the above-mentioned angular non-spherical particles are used. [Effect of the Invention] According to the present invention, the following effects can be obtained: (1) A light diffusion sheet having high yield and high productivity and low cost can be manufactured; 200835940 (2) This is a very high quality backlight device, and the backlight device is The gradation pattem does not degrade the display quality while effectively eliminating the bright/dark lines, and suppresses the generation of glare. [Embodiment] [Best Mode for Carrying Out the Invention] An embodiment of the present invention will be described with reference to the drawings. =^ indicates a partially enlarged cross-sectional view of a schematic grain mold of a roll-shaped mold used in the production of a light-diffusing sheet. Fig. 3 is a schematic view showing a light-diffusing sheet produced by using a roll. The shape of the concave-convex mold like a roll-shaped mold is used to manufacture a heart-shaped film. The optical sheet has a lens portion disposed on the light-emitting surface: the Ϊ region A' and having at least a row other than the person in the region. As shown in Fig. 3, in the area ,, a lens row of a shape is used as a lens portion. The formation of the rafts can also be arranged in the light. == As stated: the end of the second end extends to the other end. The lens includes a plurality of protrusions. One end of the lens portion has a height of approximately one Γ疋 from the one end of the optical sheet to a projection having an approximately angular cross section, and the height is reduced to exemplify the rib. As such a sudden reading. As shown in FIG. 4, the multi-stage reduction type 200835940, which has a multi-stage reduction type, has a structure in which the first stage protrusion and the second stage protrusion are connected, and the structure of the first stage protrusion is substantially constant. And the profile is slightly: = a decrease in the degree and a slightly triangular profile of the protrusion - the body 'reduced and the profile is slightly triangular - 4 is two: and the upper: face light; the protrusion: (the second paragraph), to these Sudden: Cheng. One end of the sheet is connected to the other end to be reduced, and the lens portion may include a plurality of protrusions having a substantially elliptical cross section as described above. Upper: The end of the two ends is reduced to the other end and the surface is: mirror, etc. The ridge average two trr portion "scatters with a high average tilt angle, so that the brightness of the portion is significantly lower; 12 200835940. Recognized. Further - an optical sheet having a light diffusing function is produced by transferring the shape of the concave-convex mold. The optical sheet has At least one region A whose surface roughness gradually changes continuously from the end portion, the region having a larger arithmetic mean angle RAa than the region B other than the region or a load length ratio Rmr (50%) of the coarse sugar curve As a measure of a quality defect such as a bright line or a dark line, a region A having a large roughness is placed. It is desirable that at least a part of the above region A has an arithmetic mean inclination angle RAa of 5 to 35 degrees (preferably 10 to 30 degrees). More preferably, if the average tilt angle is less than 5 degrees, the average tilt angle of the optical defect is greater than 3S degrees, and the brightness is significantly recognized in the part. The negative defect is visually recognized. - Part has a rough curve ^ ^ Rmr (50〇 / 〇) ^ 4〇.8〇0 / 〇 ^ ) The roughness profile of the unevenness is large.

The degree of unevenness of the degree is high (the spatial density is high). Therefore, if the two-phase load length ratio Rmr (50%) is less than 4〇%, the upper X-rate is small, and the concealability of the optical defect is insufficient. If the roughness of the two-line Rmr (50%) is larger than _, the scattering Efficiency and the decline of the negative' make quality defects easy to be visually recognized. The head is less than 1 point, and the arithmetic average is coarse and Ka is the value of 〇·75~3 μηι (preferably ho~9 η~2.0 Mm). If the arithmetic mean roughness is as follows: two of the two 13 200835940 η effect ^ low, the optical lag hidden nucleus is insufficient, _ 抒 粗糙度 roughness = = the shooting efficiency is too high, the brightness is significantly reduced 'to make the quality lack of hope is that the above area At least a part is 拗=43.5~2〇, (preferably 5·.== ί scattering ιΓ° value. If the 10-point average roughness Rz is less than 3.5 _ i, the silk defect is not ^, if ig point The average coarse roundness is easily noticed by the target rate such as 'the brightness is significantly reduced, so that the quality lacks the hope that the above area A is, one, the interval S is less than or equal to 35 (better; the flat part is less than or equal to 25μη1) Part 2: 'More glare reduction. And then high-quality rough surface that is difficult to reach. Also, if local = can obtain a uniformity of 35 μιη, and the arithmetic mean coarseness ^ is evenly spaced S is less than or equal to First spread the heart, conceal the above. 'The hope is that the above area is the same as the & face. If it is less than or equal to called m (preferably the spacing between small bumps is less than or equal to 6〇μη〇. 27〇_'better is the average interval s _ point basic Sm, and the local peak is greater than the local sound The flatness of the s is 'bumpy_spacing. Sm. It is desirable that the above-mentioned area is β ^ interval. ~4〇μηι (better is the average interval S of 1〇科科部 is 5 μΐΏ better) 〇~ 30 μχη), 14 200835940 Or the pitch Sm between the bumps is 10~1〇〇μηι (preferably 2〇~ such as 'better 20~80 μη〇. There is a tendency to be due to local peaks = average interval s or the spacing between the bumps Sm^, so the effect of glare is reduced, and secondly, it is difficult to visually see the uneven scattering, so that the hook height is high. However, if the average interval of the local peaks s is less than 5 pm, or === is less than 1 〇 _, then the diffusion function of the diffusion sheet or the first defect is not good, so it is not good. On the other hand, if the average interval S of the local peak is greater than 4 0 _ , or the pitch s between the bumps is greater than (10) μπι 'there is a tendency to visually glare. It is desirable that the average tilt angle of the above region is Η5 degrees (better = 1.5~Η) degrees, and more preferably 2 ~8 degrees). If the average tilt angle is less than 〗 The optical concealment of the film is insufficient, if the average is greater than 15 degrees, there is excessive Scattering or _light, the tendency to cause a significant decrease in brightness. 1 to 70% (preferably 2 to -6%). Right roughness curve _ load length ratio Rim (50%) is less than !%, diffusion sheet Insufficient optical _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 2~U _, more preferably 0.3~0.91). If the average coarse sugar degree/丨, 妒^ π 7 ) is insufficient, if the 瞀1 qing, the optical concealment of the diffuser is excessively scattered or retroreflected, resulting in brightness. Significant decline in the tendency _ 15 200835940 ~ 8 points flat, roughness Yu 7 10 points average rougher R f handsome better 疋 ~ 5,). If it is insufficient, if ίο points 7 _, then the optical concealment of the diffuse moon or the retroreflective light will cause the R ^ R ^ ^ ^ ^ ^ 8 8 8 8 8 8 8 8 8 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 Well, the total light transmittance of the above area is greater than or equal to the point of 3〇%, and (4) is the view of brightness = better, the haze value is better: the rate ί causes the following: = (4) 'The above area The total light transmittance of bismuth 90% (more than 92%) 'diffusion transmittance is greater than or equal to Μ 疋 is greater than the miscellaneous, more preferably 35%). The uneven structure of the sheet is formed of, for example, an ultraviolet curable resin. The ultraviolet ray-hardened lion may be contained, and the diffusion material has a refractive index difference of _~(tetra)(^^^0~0.07) and an average particle diameter of 4 to iQ_. If the split ratio is less than 0.01, the internal scattering by the diffusing particles is small, and the concealability is not f'. If the yield difference is larger than _, the scattering of the auxiliary portion is excessively increased, resulting in a decrease in brightness, which is not preferable. Further, the back surface of the light-diffusing sheet (the surface on the side of the uneven surface of the uneven structure surface formed by transferring the shape of the concave-convex mold) can also be used for the anti-stick function. 16 200835940 In the upper: area It:::: face-illuminated surface light source device, can be used as a light diffusing sheet', the light diffusing sheet of the above invention, the light exiting the light guiding body into the body ===== sheet. The light-diffusing end portions are placed so as to face the light-emitting body on the two sides, and twelve: '' uses the region A having the both ends as the light-diffusing sheet. The above one. The human light source can also be an LED light source. The incident region A has a heterochromatic light-diffusing sheet having a thickness of 2 to 3 G times the thickness of the incident surface of the light-receiving plate. The clothing towel can also (4) the total reflection type deflecting film and the upper illuminating illuminating light for the directional high-intensity surface light source have obvious effects on the countermeasures against the quality defects of the first part. Alternatively, the surface of the metal light mold may be treated with fine particles having a center particle diameter of 5 to 45 μm (preferably 1 to ~ melon, + =^/疋15 to 35 μm) to obtain a fine concavo-convex structure. The ultraviolet light-curable resin is used to produce a light-diffusing sheet by transferring a portion of the light-diffusing sheet to at least a portion of the light-diffusing sheet. It is possible to use a fine particle having a center particle diameter of 30 to 180 μm (preferably 45 to 15 〇Mm'/more preferably 63 to 125 μm) to obtain a fine unevenness on a metal roll mold table. a structure in which the fine uneven structure is transferred and cured on a transparent substrate by using a UV-curable tree, and at least a portion of at least the A region of the light-diffusing sheet of the above-mentioned 17 200835940 is obtained, whereby if the center particle diameter is less than 30 μm, Then the spray energy is weak and it is difficult for anyone. The mouth is processed to make it difficult to form a rough surface. On the other hand, -: ^ big? At 180 μm, the concave-convex structure becomes larger. This will become a surface light: upper or brighter, and can be observed, so it is not good. ',,, light can be used with an angular diameter of 38 _ (preferably 2 〇 μιη, more preferably 15 μηη)

The surface of the metal roll-shaped mold is subjected to a blasting treatment to obtain fine irregularities: a structure is used to transfer the fine uneven structure to the outer surface, and the at least the Α region of the light-diffusing sheet is obtained on the bright substrate. Hunt this to make light diffusion >1. If the diameter of the towel is greater than 38 μm, the resulting light-diffusing sheet has a strong scattering and is easy to visually recognize the glare. Fine particles of SiC or alumina are exemplified as the fine particles. It is also possible to use particles in which the above-mentioned angular non-spherical particles are mixed. EXAMPLES Hereinafter, the present invention will be more specifically described based on examples. [Examples 1 to 2] <Evaluation method> (1) Haze value (Hz), total light transmittance (Tt), and diffuse transmittance (Dfs) Using a duty meter NDH2000 (manufactured by Sakamoto Electric Co., Ltd.) And measured according to jis (Japanese Industrial Standard) K736-1, K7105, K7136; (2) surface uneven pitch (Sm), average interval of local peaks (s), average roughness of Ra), 10-point average roughness (RZ), arithmetic average 18 200835940 Inclination (RAa) using a stylus type roughness meter SURFC 〇 M14 〇〇 LCD (Tokyo Precision Manufacturing), and according to JIS B0601: '94, B0031:, 94 to determine; '" (3) for glare evaluation, using a directional surface light source, this directional surface - the light source uses a 14.1 吋 size total reflection type Μ γ γ γ Μ Μ Μ ( 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造At 17 degrees, the peak angle of the emitted light is at the normal (twist) bandage of 5 degrees and has a single peak outgoing light distribution characteristic. The diffused film produced by _ is placed on the directional light source and visually observed in the dark room. Evaluate the degree of glare; ' (4) in the cold cathode tube light source near the light entrance The visibility of the optical line defects of the bright line and the dark line is evaluated by sequentially placing the above-prepared diffusion sheet and liquid crystal panel on the surface light source of the above (3), and evaluating the surface light source from above. The optical quality defect of the oblique bright line in the LED light source or the triangular dark portion of the LED from the normal direction is arranged by arranging the wafer type LED (manufactured by Nichia Chemical Co., Ltd.) at intervals of 1 〇 and using the full anti-reflection type M268YK (1 〇4吋 directional surface light source manufactured by Mitsubishi Rayon), the diffusion sheet and the liquid crystal panel are sequentially placed on the directional surface light source, and the upper part is subjected to a target price. At this time, the _light-emitting surface to the display area The distance from the field is about 2.5 mm. <Sample preparation> A roll mold of 3 〇〇μη copper plating is applied to the outer circumference of a core having a diameter of 200 and a length of 7300 mm, and the roller is rotated every time. The blasting process is performed while rotating. The blasting process is as shown in the table, and 8 nozzles are arranged at a distance of 220 mm from the surface of the roller, and the pressure is applied to the rotation of the 19 200835940 roller die. 〇MPa (example 丨) and 〇·4 run (Example 2) The grinding material was processed. The above-mentioned grinding material used spherical glass beads of 10 to 35 μηχ, and these glass beads were sprayed onto the entire surface of the above-mentioned mold, thereby producing a roll mold having a fine concavo-convex shape (corresponding to a crucible region). Next, the end portion of the above-mentioned roll mold is disposed at a height of 60 mm from the surface of the mold, and has a width of 2 〇rnm perpendicularly transverse to the rotation axis. a spray mask (made of a resin plate) of a long-angle window of 200 mm in length, and a spray nozzle at a height of 120 mm above the mask to discharge the pressure 1. 〇^^^ Fine particles having a center particle diameter of 45 to 75]11111 were ejected, whereby a final mold having a rough uneven region corresponding to the pattern of the region A was obtained. The area A has the most rough area (the table shows the pitch Sm between the surface unevenness, the average interval s of the local peaks, the arithmetic mean roughness Ra, the 10-point average roughness Rz, the average inclination Aa, and the load length of the roughness curve. The rate Rmr) begins to gradually decrease the roughness gradually and is smoothly connected to the area B. In addition, the above-mentioned roll mold is placed adjacent to the rubber nip roller in parallel, and a pET film having a thickness of 188 μm is supplied along the roll mold (Polyethylene terephthalate 'polyethylene terephthalate) (Transparent substrate made of Toyo • Textiles Co., Ltd., trade name: A4300), and finally a pneumatic cylinder connected to a rubber roller, and a light-transmitting substrate is rolled between the rubber roller and the roll mold. On the other hand, the following ultraviolet curable composition phenoxyethyl acrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd. ^ 20 200835940 VISCOAT # 192): 50 parts by weight of double-test A_diepoxy-acrylate (Kongrong Company) Epoxy Chemical Industry Co., Ltd. manufactures epoxy ester 3000A): 50 parts by weight of 2-1 benzyl-2-mercapto-1-propenyl-propanone (Darocurell 73 manufactured by Qba-Geigy Co., Ltd.): 1.5 parts by weight, Further, 10 parts by weight of ruthenium particles (manufactured by Toshiba SILICONE) having a refractive index difference of 0.08 and a particle diameter of 3 μχη with the ultraviolet curable resin described above were mixed and adjusted to have a viscosity of 3 〇〇 mPa·s/ 25C5c. The strand was hardly shattered and supplied to the surface of the light-transmitting substrate-side of the rubber roller which was rolled to the light mold. - The surface of the roll mold is rotated, and the r-curable composition is sandwiched between the roll mold and the light-transmitting substrate, and the ultraviolet light-curable composition is made. The combination of hardening 'and transfer|concave shape of the transfer surface of the can. Thereafter, the film was released from the roll mold to obtain a light-diffusing sheet. Table 1 shows the respective characteristics of the A region and the B region of the light-diffusing sheet obtained above. An acrylic resin light guide plate having a width of 14.1 inches (a thickness of the light-receiving portion having a thickness of 〇Jmm) and a light-incident portion thereof are disposed in a light-emitting surface of the light guide plate as a primary light source ( The upper surface) is formed by forming a light-biasing film facing downward (Μ268γ: the other side and the back surface of the Mitsubishi Phillips cover, and the light-diffusing sheet of the (4) 忖 width is cut on the light deflecting film, whereby Λ A high-quality liquid crystal display device has been obtained. The liquid crystal is not placed on the device, and the device is illuminated by the cold cathode #. The crystal display surface 21 200835940 is placed on the top and observed. The visibility of the indicated bright/dark lines is greatly improved, and there is no glare. The LEDs are arranged as primary light.

The source-inhibited light source device can also be in the same situation as described above. [Embodiment 3 to I6J use the same light mode as the light mode in the above embodiment 2, in the direction of the first rotation direction, into the mirror, and the core is substantially the same as the structure of the above embodiment. Roller mold (: "Method" is made with fine concavities and convexities corresponding to the β-region or as shown in Table 1, at a distance of #1 from the distance of #1, the nozzle is 8 mm0 with a discharge pressure 〇3 π r Am 7 % of the square 疋 疋 早 用 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心 中心It is made into a fine concavo-convex shape (corresponding to the use of the roll mold, the average particle diameter of the purple color is 73 ^ / 5% by weight in the fine day, and the standard deviation of the granules from the distribution is 27 " The refraction of m /, 溥臈's adhesive n # Λ ^ ' . The material is supplied to the surface of the light diffusing material with a difference of 0.04 by the zander, _^==_ two sides of the light-transmitting substrate Formula, _ bit = size _ ^ ^ A _ diffuser of the square mirror at the end. D ♦ 13 pieces made of the final part of the ribs 1 recorded in the light diffusion (four) A_#B area of each special 22 200835940 The liquid crystal display device is similar to the liquid crystal display device. The liquid crystal display device is visually observed in the same manner as the case of the B. Hers. It is found that there is almost no sub-well H-day m dark line' and no glare. In the arrangement of led as the case - situation: 10.4 In the kneading surface light source device, the same [Comparative Example 1 to 2] as described above was also observed. The light diffusing film of the specific structure in which the film was formed by applying the coating method containing the fine particle coating material was observed. It is recorded that the obtained light expansion field is visually observed in the same manner as the above-described embodiment, and it is found that k has obtained Table 1. The results shown.

23 200835940

[I <] JUS99<N 寒 宕 铋 铋 铋 玫 玫 玫 玫 ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ 载 载 载Glare If back completely glare, no glare, no glare, no glare, no glare, no glare, no glare, no glare, no glare, no glare, no glare, no glare. Less than glare, no glare, no glare, no glare, no glare, no glare, no glare, no glare, no glare, no glare, no glare, no glare, no glare, no glare, no glare, no glare, no glare Rate Rmr (50%) (%) 20.33 | 35.95 1 32.86 1 38.46 1 32.85 | σ\ *r> 45.98 1 40.98 1 I 47,51 |1 〇〇50.53 1 1 61.99 1 48.44 1 1 64.19 1 37.83 1 1 15.09 ι 28.98 I ίΓ w ^ <3 2.392 v〇〇〇(N 3.223 ΓΟ ΓΟ | 3.873 1 3.773 3.843 4.576 2.692 3.131 3.684 4.039 3.852 4.766 4.858 4.105 1 3.985 1 1 6.447 is " Ξ ^ 0.798 1 1.052 1 1.336 cn Mm 1.777 卜 (Ν 00 5 | 1.197 | 1.598 2.034 (Ν cn rs 1 2. 751 1 2.854 2.971 〇〇VO (Ν 3.516 4.143 1 arithmetic mean roughness Ra ( μπι) 2 c> 0.175 0.214 0.245 οϊ ο 0.323 0.326 | 0.415 0.215 0,289 | 0.408 1 0447 0.863 | 0,686 1 0.729 0.539 0.738 0.703 Partial peak Average interval S(μπι) 16.91 〇6 〇〇22.17 21.17 24.17 23,95 26.32 | 22.46 1 25.33 Os fN [29.63 38.03 33.93 mm 37.88 52.802 "42.097 Spacing between surface irregularities Sm (μπι) 38.98 1 47.16 1 49.16 1 54.71 | 1 56.78 1 74.51 I 64.36 1 67.93 On !〇1 72.62 88.48 81.76 1 132.6 j 1 117.81 1 105.97 1 90.14 1 150.51 | 110.64 1 Diffusion transmittance Dfs (%) 31.61 36.63 1 Γ42.98 1 46.04 1 43.32 47.34 1 52.05 | VO 33.38 1 38.94 1 丨43.95丨47.54 1 Η 49.21 1 54.51 1 "57.41 1 36.43 1 60.58 | Total light transmittance It (%) 92.01 92.24 | 92.47 | "92.81 92.63 92.79 92.63 I 93.67 1 92.07 | 92.26 00 ( N 〇\ 93.03 92.78 I 93.15 93.73 94.08 90.39 | 93.45 | Haze value Hz | 34.66 | 39.71 | 46.48 | | 49.61 1 1 46.76 1 51.02 | 56.19 i 1 36.25 (N | 47.36 | 1 45.92 | 52.82 1 58.15 61.0 2 d inch | 64.83 -n> ^ cd ΓΟ inch 〇to 〇VD 〇Ο inch Ο 〇v〇o rn inch inch «η 〇so om ο inch〇yn ο SO Ο coating method spray distance (mm) ( N 〇<Μ (Ν CS s § S CM (Ν (Ν N N Ν N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N Center particle size (μιη) m ι ο to ml O m 1 〇1—( ΓΟ 1 〇ι ο m m ι ο in m ι ο 10 ～ 35 T Τ τ jn T 妄? 46 ～ 75 TT area Β r- ^ Example 2 ΓΟ Example 4 Example 5 实施 Example 6 Example 7 Example 8 Os 〇W Example 11 1 Example 13 1 Example 14 Example 15 Example 16 Comparative Example ι I Comparative Example 2

Inch (N 200835940

j!^899(n 璲-M ^ < Gong 4' 璐鲮 Grandpa G η丨 General Puyun Q茗岭Helmet J 〇®i «-宕ππ 斗ω „芩nr> Photo 4*1 ^ m J ®ί 说墙#轺〇^ ΠΠ ΠΠ 夺 夺 夺 本 本 。 蛛 蛛 蛛 蛛 蛛 ff ff ff ff ff ff ff ff ff ff ff 孽 孽 孽 孽 孽 孽 孽 您 您 您 您 您 您 您 您 您 您 您 您 您 您 您 您 您 您 您Φ 孽 孽 现 现 : 杂 杂 杂 杂 杂 杂 杂 杂 杂 杂 杂 杂 杂 杂 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘 忘Κ 袭 袭 杈 杈 杈 杈 骅 琮 琮 琮 琮 琮 琮 琮 琮 琮 琮 琮 琮 琮 ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ The mourning 唬鹚 唬鹚 碳 碳 。 。 请 请 请 请 请 请 请 请 请 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 1 16.603 1 22.46 1 2Special 4.773 8.527 1 Arithmetic mean roughness Ra (μπι) 0.792 1.448 1 Average interval of local peaks S(pm) 13.49 18.75 1 1 Spacing between surface irregularities Sm (μηι) 36.18 47.79 i Diffusion transmission Rate Dfs (%) 1 1 1 1 1 ^ wt 1 瞧Haze value Hz 1 1 1 Shape mode of area A Spray processing rough surface mold spray processing rough surface 90 degree 稜鏡 shape (mixed into diffusion material) Area A Example 1 Example 2 1 m 200835940 [Simplified illustration of the drawing] Fig. 1 shows the use of the light diffusing sheet for manufacturing Fig. 2 is a partially enlarged cross-sectional view showing the roll mold of Fig. 1. Fig. 3 is a schematic view showing a light diffusing sheet manufactured using a roll mold. Fig. 4 is a view showing a light diffusing sheet manufactured using a roll mold. Fig. 5 is a schematic view showing a light diffusion sheet manufactured using a roll mold.

26

Claims (1)

200835940 X. Shen Qing patent scope: manufactured by German and Indian four-convex mold shape and right; the light diffusing film is composed of two: the optical film has a hidden area, and the #= part is disposed in the above optical I: "", in the area 〇 表面 表面 表面 · · · · · · · · · · · · · · · · · · · · · · · · · · , , , , , , , , , , , , , , , , , , , , The end of the optical sheet from the end of the optical sheet::: 俨 above, 3, as described in the scope of the patent, the i-moving portion of the film 2 includes a plurality of protrusions from the end of the optical sheet The height of the 11 end is reduced. The light diffusing sheet as described in claim 3, wherein the upper L lens portion includes a plurality of protrusions which are reduced in height from the end to the other end of the optical sheet, and have a substantially triangular cross section. The light-diffusing sheet according to claim 3, wherein the migrating portion includes a plurality of protrusions, and the protrusions are protrusions extending from one end of the optical sheet to a further constant height and having a slightly triangular cross section. It is integrated with a protrusion with reduced twist and a slightly triangular profile. The light-diffusing sheet according to claim 3, wherein the migrating portion includes a plurality of stages of a multi-stage reduction type, and the multi-stage reduction type is formed from one end of the optical sheet. a protrusion having a height substantially equal to the other end and having a substantially triangular cross section, a protrusion having a reduced height and a slightly triangular cross section, and a protrusion having a reduced height and a slightly double-sided cross section. The height of the protrusion is reduced from the end of the above-mentioned optical sheet 27 200835940 to the other end. The light-diffusing sheet according to claim 1, wherein at least a side surface or a valley portion of the lens portion is roughened by a surface. 8. The light-diffusing sheet of claim 1, wherein at least the back surface located below the lens portion is roughened by a surface. 9. The light-diffusing sheet of claim 8, wherein the average roughness of the surface roughened portion is a degree. The light diffusing sheet according to the first aspect of the invention, wherein the average interval S of the partial peaks in the region B is 5 to 40 μm, or the pitch Smm 10 to 1 〇〇 μηη between the concave and convex portions. 11. The light diffusing sheet of claim 1, wherein the average tilt angle of the region 为 is a degree. The light-diffusing sheet according to claim 1, wherein the load length ratio Rm < 50%) of the roughness curve of the region B is 1 to 7 Å/. . The light-diffusing sheet according to claim 1, wherein the arithmetic mean roughness Ra of the region B is 0.1 to 1·3 μm. The light-diffusing sheet according to claim 1, wherein the one-point average roughness Rz of the region Β is 〇·7 to 8 μmη. The light-diffusing sheet according to claim 1, wherein the uneven structure of the light-diffusing sheet is formed of an ultraviolet-curable resin containing 1 to 2% by weight of a diffusion material, the diffusion material having The refractive index difference of 〇·〇1 to 〇1〇 is compared with the tree, and the average particle diameter is 4 to 1 〇μπι 16. A light-diffusing sheet is a member manufactured by transferring a shape of a concave-convex mold. 200835940 -----jr - an optical sheet having a light diffusing function, characterized in that the optical sheet has at least one region A which gradually changes in thickness continuously from the end portion, and the region has a ratio A larger average arithmetic mean angle RAa of the area B and a surface roughness is substantially constant, or a load length ratio of the roughness curve Rmr (50%) 〇17. The light diffusion sheet of claim 16, wherein At least a part of the above region A has an arithmetic mean inclination angle RAa of 5 to 35 degrees. The light-diffusing sheet according to claim 16, wherein a load length ratio 111111·(50%) of at least a part of the region A having a roughness curve is a value of 40 to 80%. The light-diffusing sheet according to claim 16, wherein at least a part of the region A has a value of an arithmetic mean roughness Ra of from 0.75 to 3 μm. The light-diffusing sheet of claim 16, wherein at least a part of the above region has a value of 1 〇 point average roughness Rz of 3·5 to 20 μηη. The light-diffusing sheet of claim 16, wherein the average interval S of the partial peaks of at least a part of the region 小于 is less than or equal to 35 μηη 22 · The light diffusion as described in the item μ of the patent application a sheet in which a pitch Sm between at least a portion of the above-mentioned regions 小于 is less than or equal to 80 μπι ° 23 · The average of the partial peaks of the region B of the light diffusing sheet described in the second item of the application of the patent No. 29 200835940df The interval s is 5 to 々ο μιη, or the pitch Sm between the concavities and convexities is 1〇1 to 1〇〇_. The light diffusing sheet of claim 16, wherein the average inclination angle of the upper region B is 丨 15 15 degrees. The light-diffusing sheet according to claim 16, wherein the load length ratio Rmr (5〇%) of the roughness curve of the region B is 1 to 70% 〇26·If the patent application is the 16th item In the light diffusion sheet, the arithmetic mean roughness Ra of the region B is 0·1 to 1·3 μπι. The light-diffusing sheet according to claim 16, wherein the 10-point average roughness Rz of the above region 0.7 is 0.7 to 8 μm. The light-diffusing sheet according to claim 16, wherein the concave-convex structure of the light-fracture sheet is formed of an ultraviolet-curable resin, and the ultraviolet-ray-reducing tree-shaped enamel contains 1 to 2% by weight of a diffusion material. The diffusing material is a surface light source device having a refractive index difference of 0·01 〇·1 相比 compared with the resin and an average particle size of 4 to 10 μπι 10 10 29 , and is an end face illumination type surface light source device, and At least: a primary light source; a j body 'the light emitted by the secondary light source is guided, and then guided to emit; the light deflecting element is arranged to allow the outgoing light from the light guiding body to enter; and the heart is as good as The light-diffusing sheet according to the first aspect is arranged such that light emitted from the light is deflected toward the element, and the surface light source 30 200835940 is placed on the primary light source side by using the region Α. The above light diffusing sheet. The surface light source device according to claim 29, wherein the surface light source is vibrated by using a distance of 2 to 30 times the thickness of the incident end surface of the primary light source having the light guide plate in the region A. The light diffuser is formed. 31. A surface light source device is an end face illumination type surface light source device, and includes at least: a primary light source; a light guide body, after the light emitted by the primary light source is introduced, and then guided to emit; the light deflecting element is caused to And the light diffusing sheet according to claim 16 is disposed such that the light emitted from the light deflecting element is incident, and the surface light source device is used. The light diffusion sheet is configured by disposing the region A on the primary light source side. The surface light source device according to claim 31, wherein the surface light source device is a light diffusion sheet having a distance of 2 to 30 times the thickness of an incident end surface of the primary light source of the light guide plate. Composition. 33. A method for producing a light-diffusing sheet, which is a method for producing a light-diffusing sheet according to claim 1, wherein the surface of the metal roll-shaped mold is sprayed using particles having a center particle diameter of 5 to 45 μm The fine concavo-convex structure is obtained by the treatment, and the fine concavo-convex structure is transferred to the transparent substrate by using an ultraviolet curable resin to obtain a part of at least the B region of the light diffusion sheet. 34. A method for producing a light-diffusing sheet, which is a method for producing a light-diffusing sheet according to the above-mentioned patent application, wherein the surface of the metal roll-shaped mold is made of particles having a center particle diameter of 30 to 180 μm. The fine concavo-convex structure is obtained by the blasting treatment. The fine concavo-convex structure is transferred and cured on the transparent substrate by using an ultraviolet curable resin to obtain at least a part of the ruthenium region of the light-diffusing sheet. 35. A method for producing a light-diffusing sheet, which is a method for producing a light-diffusing sheet according to claim 1, wherein the metal roll-shaped mold is used with angular non-spherical particles having a center particle diameter of 38 μη or less The surface is subjected to a blasting treatment to obtain a fine uneven structure, and the fine uneven structure is transferred and cured on the transparent substrate using an ultraviolet curable resin to obtain at least a portion of the light-diffusing sheet. 36. A method for producing a light-diffusing sheet, which is a method for producing a light-diffusing sheet according to claim 16, wherein the surface of the metal roll-shaped mold is sprayed using particles having a center particle diameter of 5 to 45 μm The fine concavo-convex structure is obtained by the treatment, and the fine concavo-convex structure is transferred and hardened on the transparent substrate by using an ultraviolet curable resin to obtain an adjacent portion of at least the crotch region of the light-diffusing sheet. 37. A method for producing a light-diffusing sheet, which is a method for producing a light-diffusing sheet according to item 6 of the patent application, using a granule having a center particle diameter of 3 〇 18 〇 to a metal roll-shaped right holder The surface is subjected to a blasting treatment to obtain a fine, opaque structure. The ultraviolet ray-curable resin is used to bond the fine embossed structure to a transparent substrate to obtain a part of at least the A region of the light-diffusing sheet. 38. A method for producing a light-diffusing sheet, which is a method for producing a light-diffusing sheet according to claim 16, wherein the metal roll is used with angular non-spherical particles having a center particle diameter of less than or equal to '38 μm The surface of the mold is subjected to a blasting treatment to obtain a fine uneven structure, and the fine embossed structure is transferred and cured on the transparent substrate by using an ultraviolet curable resin to obtain at least a part of the ruthenium region of the light-diffusing sheet. ❿ 33