TWI354122B - Lens sheet, planar light source device and liquid - Google Patents

Description

1354122 25645pifl is the Chinese version of the 96133810, and there is no book line correction. The date of this revision: 1 year's 27th. 6. Description of the Invention: The present invention relates to a liquid crystal display device, which is used as the liquid crystal. A surface light source device of a backlight module of the display device and a lens sheet constituting the surface light source device. More particularly, the present invention relates to a lens sheet, a surface light source device, and a liquid crystal display device which are intended to reduce the glare phenomenon called speckle or sparkling in image display of liquid crystal display. [Technology] In recent years, color liquid crystal display devices have been widely used in various fields as mobile personal computers, monitors for desktop personal computers, and video display devices for mobile TV or video-integrated televisions. The liquid crystal display element (liquid crystal panel) used in the liquid crystal display device does not emit light by itself, but functions as a fast function. Therefore, in order to improve the image display performance of the liquid crystal display, a surface light source device called an optical module is disposed behind the liquid (4), and light emitted from the surface light source device is used to photograph from the back. For example, as disclosed in Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. a light pipe, a light guide, a reflection sheet, and a polarizing element, a lens, etc., wherein the prism sheet is disposed on a light exit surface of the guide (4) to improve the optical efficiency of the back domain group to improve brightness, for example, On the surface of the light-transmissive sheet, a lens sheet having a cross-sectional shape of 〇 为 〜 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 256 Chinese Illustrated No-Book Marking Revision Date: July 27, 100, as described in Japanese Patent Laid-Open No. Hei 6-324205 (Patent Document 3), 曰本专利特开平1〇-16〇914 (Patent Literature) 4) and 曰本 f利特开2000- As disclosed in Japanese Patent No. 353413 (Patent Document 5), it is assumed that the ruthenium sheet should have a function of a light diffusion sheet or a light diffusion film, and a light diffusion function can be formed on the surface on the opposite side to which the matrix is formed. In the cymbal of Patent Document 3, the brightness of the surface light source device is increased and the luminance unevenness is reduced by forming a protrusion group 'having a light diffusion function and having a height equal to or greater than the wavelength of the light source light and 100 μm or less. In the ruthenium of Patent Document 4, by forming a light-diffusing layer of a coating type, a relief type, or a sandblasting type, the brightness of the surface light source device is increased and the 巾# towel of Patent Document 5 is enlarged, by coating In the case of a light-diffusing fine particle layer, such as a transparent bead, the brightness is increased, and the angle of view is increased. [Patent Document 1] Japanese Laid-Open Patent Publication No. Hei 2-84618 (Patent Document 2). Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. The function of the surface structure having the light diffusion function of the cymbal described above can be exemplified as follows: (1: > By the light diffusion of each of the protruding gorges, the desired haze is obtained by the filament, thereby adjusting (2) suppressing a phenomenon called image sticking, that is, suppressing a light diffusion sheet or a liquid crystal panel due to a surface located on the upper surface of the pellet (the side opposite to the prism forming surface) Locally intimate and interference fringes 1354122 25645pifl is No. 96133810 Chinese description No book line correction This revision date: July 27th (interference fringes); (3) The so-called defect concealment, that is, reducing the prism column The visibility of the surface structure defect 'either reduces the visibility of surface structure defects such as a matte structure or a lens array array structure formed on the light exit surface of the light guide or the back surface on the opposite side. The above-mentioned defect concealment is particularly important when a high-brightness light source is used as a primary light source. However, when a surface structure having a light diffusing function is formed on the surface on the opposite side of the tantalum forming surface of the cymbal sheet, the directivity of the inner surface of the prism sheet after the light guide is emitted is very strong. It is subject to the interference of the surface structure having a light diffusing function, and sometimes a glare phenomenon in which fine particles inside the coating film or unevenness of the surface is generated and which is called a speckle or flicker is generated. At this time, the displayed image becomes very unclear, and therefore, in recent years, there has been an urgent need to solve this glare phenomenon. In the above Patent Documents 3 to 5, there is no mention of a technical problem of eliminating or reducing such glare. On the other hand, in the liquid crystal display device, when viewing from the observation side, in the liquid crystal panel located at the forefront, the display image quality may be deteriorated in order to suppress the entrance of an external light source such as a fluorescent lamp. A surface structure having a light diffusion function similar to the above is formed on the observation side surface of the liquid crystal panel. Further, in order to suppress the image sticking phenomenon on the surface on the light incident side of the liquid crystal panel, the same surface structure having a light diffusing function as described above may be formed. Based on the same reason as the case of the surface structure having a dysfunction formed on the cymbal sheet, the above-mentioned surface and back surface have light diffusion 1354122 25645pifl • For the 96th __ _ revised version of this revision date: July 27, 100 The surface structure of the daily function sometimes causes glare. At this time, the displayed image becomes very unclear. Therefore, it is urgent to solve this glare phenomenon. In order to suppress the glare phenomenon caused by the surface structure having a light diffusing function as described above, it is considered that the light diffusibility is improved by increasing the amount of addition of the fine particles in the coating film forming the surface structure. Thereby, the glare phenomenon can be made to a certain extent _ less, but there is a difficulty in that the brightness of the surface ship device 装置 device is greatly reduced. Accordingly, an object of the present invention is to reduce glare in a liquid crystal display device without causing a large luminance of the surface light source device or the liquid crystal display device. According to the present invention, in order to solve the above problems, a lens sheet is provided in which a plurality of lens sheets are formed in parallel on the first surface of a sheet-like light transmissive member having a first surface and a second surface. In the lens row, the second surface is an uneven surface, and the local peak-to-average interval s of the uneven surface is 5 μm or less and the ten-point average roughness Rz is 4 μm or less. In one embodiment of the present invention, the sheet-like light transmissive member is formed by providing a light diffusion layer on one surface of a light-transmitting substrate, and the light diffusion layer is made of a light-transmitting resin. The light-transmitting light-diffusing material is formed to be formed, and the uneven surface is formed by projecting the light-diffusing material from the surface of the light-transmitting resin. In one embodiment of the invention, the light diffusion layer has a haze Hz of 50 to 85%. In one embodiment of the present invention, the light diffusing material has a weight average particle diameter D1 of 1 to 8 μm. In one embodiment of the present invention, the radius 7 at any position of the light-diffusing layer is 1 354122, 25645 pifl, and the number of the 9613338, which is the Chinese text, is not corrected, and the correction date is: July 27, 2007, 70 μπη. In the light-transmitting resin, the number of secondary particles having a long diameter of 30 μm or more, which is formed by aggregating the plurality of light-diffusing materials, is equal to or less than three. In one embodiment of the invention, the difference between the refractive index Ν1 of the light-transmitting resin and the refractive index Ν2 of the light-diffusing material is 0.03 to 0.10. According to the present invention, in order to solve the above problems, a surface light source device including an under-light source, a light guide, and the above-described lens sheet is provided. When the light emitted from the primary light source is introduced into the light guide, the light guide guides the light to emit the light. The lens sheet is disposed such that the emitted light from the light guide body is incident thereon. The light guide body includes a light incident end surface into which the light emitted from the primary light source is incident, and a light exit surface that emits the guided light. The primary light source is disposed adjacent to the light incident end surface of the light guide body, and the lens sheet is provided. The ith is placed facing the light exit surface of the light guide. Further, according to the present invention, in order to solve the above problems, a liquid crystal display device including the above-described surface light source device and a liquid crystal panel is provided. The liquid crystal panel is disposed such that light emitted from the second surface of the lens sheet of the surface light source device is incident on the liquid crystal panel, and the liquid crystal panel includes light emitted from the second surface of the lens sheet. The human face, and the observation surface on the opposite side. In the embodiment of the present invention, the observation surface is an anti-glare surface, and the 60-degree gloss value G1 is 25 or more. In the embodiment of the present invention, the observation surface is set to a glare surface. 6 The gloss value G1 is 90 or more. In the embodiment of the present invention, the human face is set as an anti-glare surface, and 25645 pifl is corrected. The date of July 27, the year of July 27 is the number of the 9612,338, and the oscillating stroke is corrected. The above observation (four) 60 degree gloss value G1 and The 6Q degree gloss of the above-mentioned human face, and the ratio G1/G2 of G2 is greater than or equal to i. In an embodiment of the present invention, the tenth coarseness Rz of the observation surface is less than or equal to 2 beer. In the embodiment of the present invention, the liquid crystal display bag includes a light diffusion sheet that is placed on the lens sheet such that light emitted from the second surface of the lens sheet is incident on the liquid crystal display sheet. Between the liquid crystal panels, at least one surface of the light-diffusing sheet is a concave-convex surface having an average peak-to-peak interval S of 5 小于 or less and a ten-point average roughness Rz of 4 μm or less. In one embodiment of the present invention, the light diffusing sheet II is formed by providing a light diffusing functional layer on a surface of the through substrate, and the light diffusing functional layer is provided in the light transmitting resin. The light ray is expanded, and the unevenness Φ is formed by causing the light diffusing material to protrude from the surface of the light transmitting resin. In one embodiment of the present invention, the haze Hz of the light-diffusing functional layer is 20 to 70%. In the embodiment of the present invention, the light-diffusing material of the uneven surface has a weight average particle diameter D1 of 1 to 8 μm. According to the invention as described above, since the local peak-top average interval S and the ten-point average roughness Rz of the uneven surface of the lens sheet are respectively limited within the range of the rule, the surface light source device or the liquid crystal display is not caused. The brightness of the device is greatly reduced, and the glare in the liquid crystal display device can be reduced. [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1A shows an embodiment of a prism sheet according to an embodiment of the lens sheet of the present invention, and a surface light source device of the present invention using the same, and 1354122 25645pifl is the Chinese version of the 9613338 Fig. 2 is a partial cross-sectional view of Fig. 1 showing a schematic view of an embodiment of a liquid crystal display device using the surface light source device. In the present embodiment, the surface light source device includes: the light guide 3' has at least one side end surface defined as a light incident end surface 31, and one surface substantially perpendicular to the side end surface is defined as a light exit surface 33; The light source 1' is disposed opposite to the light incident end surface 31 of the light guide 3 and covered by a light source reflector 2; the cymbal 4 is disposed on the light exit surface 33 of the light guide 3 as a polarizing element And the light reflecting element 5 disposed to face the back surface 34 on the opposite side of the light emitting surface 33 of the light guide 3. Further, in the present embodiment, the liquid crystal display device includes a liquid crystal panel (liquid crystal display element) 8 disposed on the light-emitting surface 42 of the wafer 4 of the surface light source device. The light guide body 3 is disposed in parallel with the XY plane, and has a rectangular plate shape as a whole. The light guide 3 has four side end faces, and at least one of the pair of side end faces parallel to the YZ face is defined as a light incident end face 31. The light incident end surface 31 is disposed to face the primary light source 1, and the light emitted from the primary light source 1 is incident on the light incident end surface 31, and then introduced into the light guide 3. In the present invention, for example, the light source may be disposed to face the other end surface 32 such as the side end surface 32 on the opposite side to the light incident end surface 31. The two principal faces of the light guide 3 substantially orthogonal to the light incident end face 31 are substantially parallel to the XY plane, and any one of the faces (the upper face in Fig. 1) serves as the light exit face 33. The light incident from the light incident end surface 31 is introduced into the light guide 3 by the directional light emitting means formed by the rough surface or the lens array on the light exit surface 33, and is incident on the light from the light exit surface 33. Light having directivity is emitted in a surface (XZ plane) where the end surface 31 and the light exit surface 33 are orthogonal to each other. 1354122 25645pifl Revision date: July 27, 100 is the number 9613310 Chinese description of the bookless line correction is to be distributed in the XZ plane of the exit light luminosity distribution peak direction (crest light) and light exit surface 33 The angle is set to α. The angle α is, for example, 10 to 40 degrees, and the half-peak full amplitude (FWHM) of the emitted light luminosity distribution is, for example, i 〇 4 4 〇. In the rough surface or the lens array formed on the surface of the light guide body 3, the average tilt angle is set to be in the range of 〇5 to 15 degrees as defined in IS04287/1-1984, so that the light exit surface 33 is realized. It is better in terms of brightness uniformity. The range of the average tilt angle θα is further preferably 丨12 degrees, more preferably 1.5 to 11 degrees. Preferably, the average tilt angle is set to an optimum range in accordance with the ratio (L/d) of the thickness (d) of the light guide 3 to the length (l) of the incident light propagation direction. In other words, when a light guide having an L/d of about 2 〇 2 〇〇 is used as the light guide 3, it is preferable to set the average tilt angle 0a to 0.5 to 7.5 degrees, and more preferably 1 to Within the range of 5 degrees, it is better in the range of 1.5 to 4 degrees. Further, when a light guide having L/d of about 20 or less is used as the light guide 3, it is preferable to set the average tilt angle 0a to 7 to 12 degrees, and more preferably 8 to 11 degrees. Within the scope. The average inclination angle 0a of the rough surface formed on the light guide body 3 can be measured by using a stylus type surface roughness meter according to IS04287/1 - 1984, and the coordinate of the measured square is set to x, according to The obtained tilt function f (X) is obtained using the following equations (1) and (2): Δ a = (1/L) i 〇 L | (d / dx) f (X) | dx . ..... (i) 0a=tan*1 ( Δa) ...... (2). Here, L· is the measured length and is a tangent of the average inclination angle 0a. Further, as the light guide 3', it is preferable that the light emission rate is 0.5 11 1354122. 25645pifl is the 9613338. The Chinese text is not corrected by the book. The correction date is in the range of 27 曰 to 5% in July of the following year. 'Better is in the range of 1 to 3%. By setting the light emission rate to 0.5% or more, the amount of light emitted from the light guide 3 can be increased to obtain sufficient brightness. Further, by setting the light emission rate to 5% or less, it is possible to prevent a large amount of light from being emitted in the vicinity of the primary light source 1, to reduce attenuation of the outgoing light in the X direction in the light exit surface 33, and to improve light emission. The brightness on the face 33 is uniform. By setting the light emission rate δ of the light guide 3 to 0.5 to 5%, the light having the high directivity emission characteristics described below can be emitted from the light guide 3, that is, emitted from the light exit surface. The angle of the peak light in the exit light luminosity distribution (inside the pupil plane) is in the range of 50 to 80 degrees with respect to the normal to the light exit surface, and is perpendicular to both the light incident end surface and the light exit surface. The half-peak full amplitude of the exit light luminosity distribution (inside the facet) in the facet is 10 to 40 degrees, and the exit direction of the light can be effectively deflected by the cymbal 4, thereby providing a surface light source device having high brightness. . In the present invention, the definition of the light emission rate of light from the light guide 3 is as follows. When the thickness (the dimension in the Ζ direction) of the light guide 3 is d, the light intensity (1 〇) of the light emitted from the edge on the light incident end surface 31 side of the light exit surface 33 and the light incident end surface 31 side are The relationship of the intensity (I) of the outgoing light at the position of the edge distance l satisfies the relationship of the following formula (3): Ι = Ι〇 (α / 100) [1 - (α / 100) ] L / d ... ...(1). Here, the 'constant α is the light emission rate, and the light emitted from the light guide 3 is the light per unit length (the length corresponding to the thickness d of the light guide body) in the X direction orthogonal to the light incident end surface 31 of the light exit surface 33. Proportion (percentage: %). The vertical axis is the logarithm of the light intensity of the outgoing light from the light exit surface 23, and the horizontal axis is (L/d)'. By plotting the above relationship, the above 12 1354122 25645pifl correction date can be obtained from the gradient: 100 years 7 The 27th month of the month is the number 9613310. Further, in the present invention, the light-emitting means may be formed on the light-emitting Φ 33 instead of dispersing the light-diffusing fine particles in the light guide body, or the light-emitting means may be formed as described above. The two are used together. Further, the main surface which is not provided with the directional light-emitting means, that is, the back surface 34 = ??? in order to control the light emitted from the light guide body 3 in the secondary light source ^

The directionality on the face (YZ face) of the line is transverse to the light incident end face 31

More specifically, the upward direction is a prism column forming surface in which a plurality of rows extending in a row are arranged in a direction substantially perpendicular to the light incident end surface 31 (X side:). The arrangement pitch of the matrix of the back surface 34 of the light guide 3 can be, for example, in the range of 1 〇 to 100 μm, preferably in the range of 3 〇 to 6 μm. Further, the apex angle of the matrix of the back surface 34 of the light guide 3 can be, for example, in the range of ～110 degrees. The reason for this is that by setting the apex angle within the above range, the emitted light from the light guide body 3 can be appropriately concentrated.

The brightness of the surface light source device is better, and the apex angle is better in the range of 9 〇 1 to 1 〇〇. The light guide 3' is not limited to have the shape shown in Fig. 1, and a light guide body having various shapes such as a wedge-shaped thick light incident end surface may be used. The light guide 3 can be composed of a synthetic resin having a high light transmittance. The synthetic resin may be a mercapto acrylic resin, an acrylic resin, a polycarbonate resin, a polyester resin or a vinyl chloride resin. In particular, a mercapto acrylic resin having excellent permeability, heat resistance, mechanical properties, and moldability is most suitable. This methacrylic resin is mainly methacrylate methacrylate 13 25645pifl. Revision date: July 27, 2007 is No. 96133810 Chinese Description No resin for the correction of this component is better than 80 A resin of wt% mercapto phthalic acid. When a surface structure such as a rough surface of the light guide 3 or a surface structure such as a prism array or a lenticular lens array is formed, a transparent synthetic resin sheet can be formed by pressing a mold member having a desired surface structure. It is also possible to impart a shape by screen printing, extrusion molding, injection molding, or the like. Further, a heat or light curable tree or the like may be used to form the structural surface. Further, it can be a transparent substrate such as a transparent film or a transparent sheet made of a polyester resin, an acrylic resin, a polycarbonate resin, an ethylene-based resin, a polymethacrylimide resin, or the like. On the surface, a rough surface structure or a lens array structure composed of an active energy ray-curable resin is formed, and such a sheet-like structure may be separately joined and integrally formed on a transparent substrate by a method such as adhesion or welding. As the active energy ray-curable resin, a polyfunctional (fluorenyl) propylene compound, a vinyl compound, a (mercapto) acrylate, an allyl compound, a metal salt of (meth)acrylic acid, or the like can be used. The crotch panel 4 is disposed on the light exit surface 33 of the light guide body 3. The crotch panel 4 is composed of a sheet-like translucent member. The first surface 41 and the second surface 42 as the two main faces are arranged in parallel with each other as a whole, and are entirely parallel to the χγ plane. The first surface 41 (the surface facing the light-emitting surface 33 of the light guide 3) as one of the main surfaces is referred to as a light-incident surface, and the other main surface 42 is defined as a light-emitting surface. The light incident surface 41 is a tantalum forming surface in which a plurality of prism rows extending in the γ direction are arranged in parallel with each other. The light exit surface 42 is set to be a concave convex surface. Fig. 3 is a partially enlarged cross-sectional view showing the prism sheet 4 and the light guide 3. 1354122 25645pifl Revision period: July 27, 100. The cymbal sheet 4 is composed of a light-transmitting substrate 43 and a light-transmitting matrix forming layer 44 and a light-diffusing layer 45 which are layers of a light-transmitting lens array. The light-transmitting substrate 43, the matrix-forming layer 44, and the light-diffusing layer # constitute a sheet-like light-transmitting member. A prism array 41 is formed on the lower surface of the matrix formation layer 44. The lower surface is formed into the light incident surface 4, and the upper surface of the light diffusion layer 45 is formed with the light surface 42. The light-transmitting substrate 43 (four) is preferably a material which can transmit ultraviolet rays, electron beams, or the like. For example, a soft glass plate or the like can be used as the material, but polyethylene terephthalate is preferred. Glycol ester and polycaiethylene=ethylene glycol S are equivalent to poly-S resin, polymethyl methacrylate, and other cellulose-based resins such as acrylic acid and triethyl cellulose. , poly(ethyl hydrazine), acrylonitrile, stupid ethylene copolymer, etc., styrene, olefinic resin, polyethylene, ^ propylene, hydrazine or polyolefin with norbornene _ _ _ _ _ _ (4) Polyamides such as resin, money and aromatic polyester j: = vinegar resin, gas vinyl resin, polymethacrylimide = month: special transparent resin sheet or film. In view of strength, workability, etc., the thickness of the light-transmitting substrate 43 is preferably, for example, ι〇~·^!, more preferably 5 20 to 400 μηη, and particularly preferably 3Q to 3QQ. #44 The adhesiveness between the prism array forming layers constituting the tongue energy ray-hardening resin is preferably improved in adhesion treatment to the surface coating treatment of the light-transmitting substrate 43. The upper surface of the scorpion is set to be a flat surface which is joined to the lower surface of the above-mentioned light-transmitting soil #. The lower surface of the matrix formation layer 44, that is, the entrance surface 41 is set as a matrix formation surface, and is arranged in parallel with each other at 25645 pifl. The correction period: July 27, 2007 is the number 9613310. A plurality of queues 411 extending. The thickness of the matrix formation layer 44 is, for example, 10 to 500 μm, and the pitch P of the prism array 411 is, for example, two 500 μm. The prism row 411 is composed of two facets 41ia, 411b. The above two sides can be set to be optically perfectly smooth (mirror) or can be set to rough. In the present invention, it is preferable to set the prism surface as a mirror surface in consideration of maintaining the desired optical characteristics of the cymbal sheet. Preferably, the apex angle θ of the array 411 is set at 40 to 15 。. In the range. In general, in the backlight module of the liquid crystal display device, when the cymbal is arranged such that the matrix forming surface faces the liquid crystal panel, the apex angle θ of the prism array is 8 〇 1 〇〇. In the range of the left and right, it is preferably 85 to 95. In the range. On the other hand, as shown in the above embodiment, when the cymbal sheet 4 is placed such that the surface of the illuminating surface is formed to guide the light body 3, the apex angle Θ of the nucleus 411 is 40 to 75. Within the range of the left and right 'better 45 to 70. In the range. The matrix formation layer 44 is made of, for example, an active energy ray-curable resin, and it is preferable that the matrix formation layer 44 has a high refractive index in view of improving the brightness of the surface light source device and the like. Specifically, the refractive index thereof is 1.55 or more, and more preferably 16 or more. The active energy ray-curable resin which forms the yoke formation layer 44 is not particularly limited as long as it can be cured by an active energy ray such as ultraviolet rays or electron beams, and is, for example, a polyester, an epoxy resin or a poly (Meth) acrylate-based resin such as (meth) acrylate, epoxide (meth) acrylate, or urethane (meth) acrylate. Among them, from the viewpoint of optical properties and the like, the use of (fluorenyl) propaneuric acid is particularly preferable. Used as such a hardened resin 1354122 • 25645pifl Revision date: July 27, 1 year • For the 96133810 Chinese description, no book line _ 丨

The active energy ray-curable composition, in view of operability and hardenability, etc., is a polyvalent acrylate and/or a polyvalent methacrylate (the following is a polyvalent (meth) oleic acid) Vinegar), monoacrylic acid vinegar and/or monomethyl acetoacetate (hereinafter referred to as succinyl acrylate vinegar), and a composition mainly composed of a photopolymerization initiator using an active energy ray. Typical polyvalent (fluorenyl) acrylate vinegars include polyhydric alcohol poly(mercapto) acetoacetate, poly acetal poly(meth) acrylate, J mourning poly(meth) acrylate, and amine group. Poly(meth)acrylate and the like. The above various polyvalent (meth) acrylates may be used singly or as a mixture of two or more kinds. Further, examples of the mono(indenyl) acrylate include mono(indenyl)acrylate and ^(meth)acrylate of a monool. On the other hand, the light-diffusing layer 45 is formed by including a large amount of light-transmitting light-diffusing material (light-diffusing particles) 452 in the light-transmitting resin 451, and the light-diffusing material 452 is protruded from the layered layer. The surface of the light tree is such that the surface of the light diffusion layer 45 is formed as an uneven surface f. The method of forming the light diffusion layer 45 of the moon 451 is not particularly limited, and an appropriate method can be employed. For example, the light-transmitting resin 451 can be dissolved in a solvent, and a necessary amount of the light-diffusing material can be added to the two solvents to prepare a coating material ((4)). This coating material is applied to the surface of the through-substrate base material 43 and then allowed to adhere thereto to form irregularities formed by the light-diffusing material on the surface. The shape of the concavities and convexities can be easily adjusted in accordance with the content of the photo-resin in the coating material, the coating amount, and the weight average particle diameter of the optical expansion material to exhibit the necessary haze, and the height of the concavities and convexities can be appropriately adjusted. In addition, the shape of the formed concavities and convexities is determined according to the shape of the light diffusion material. For example, when a spherical light diffusing material is used, it is 17 25645 pifl. Correction date: July 27, 2007 is the number 9613310. This is a shape that is a collection of fine concave and convex lenses. Further, when the height of the concavities and convexities is too high, the angle between the concavities and convexities and the surface of the light-transmitting substrate 43 on a part of the surface of the light-diffusing layer 45 tends to exceed the critical angle of the incident light from the translucent substrate. At this time, a part of the exit surface of the light diffusion layer 45 causes total light to be reflected to cause light loss, resulting in a decrease in luminance of the surface light source device. Therefore, it is preferable that the height of the concavities and convexities of the light-diffusing layer 45 is such that a height which causes a steep inclination such as the above-described total reflection is generated on the surface. At the time of coating, it is preferable that the average thickness of the coating film after the solvent drying is set to be less than 15 times the weight average particle diameter Di of the light-diffusing material to be used. By setting the above method, it is possible to prevent the light-diffusing materials in the thickness direction of the coating film from overlapping, and it is possible to suppress glare. Examples of the solvent used in the production of the coating material include a general solvent such as toluene, mercaptoethyl group, mercaptoisobutyl ketone, ethyl acetate, butyl acetate, isopropyl alcohol or ethanol. Examples of the coating method of the coating material include a gravure coating or a lip coating, and a coating method using a comma coater. The translucent resin 451 is used as long as it is a dispersible light-diffusing material 452 and has a (four) strength. For such a light-transmitting resin, a thermoplastic resin such as a poly-based resin, a polyamine-based resin, a fat, a poly-S resin, or an acrylic resin, or a solid fat or an active energy ray-curable resin (free radiation) (Resin) It is preferable to select an appropriate material from the above various resins in consideration of adhesion to the light-transmitting substrate 43 and the light-diffusing material 452. In addition, 'can be added to the light-transmitting resin 451' containing a leveling agent, touch 1354122. 25645pifl • For the 961th time No. 0 Chinese description no book line correction This revision date: July 27, 100 variable, antistatic Agent, UV absorber, etc. Among them, by containing a leveling agent, aggregation of the light-diffusing material can be suppressed, and irregularities can be easily formed from the light-diffusing material.

As the light-diffusing material 452, inorganic fine particles such as silica, alumina, and glass can be appropriately selected; polydecyl acrylate, polystyrene, polyurethane, acrylic-styrene copolymer, benzoguanamine, melamine Or cross-linking organic fine particles; or polyfluorene-based fine particles. Further, two or more kinds of light-diffusing materials may be used in combination for different purposes. The shape of the light-diffusing material is not limited, and a light-diffusing material having a spherical shape, an irregular opening ν or a rotating ellipsoid may be used. However, from the viewpoint of improving the unevenness of the irregularities, it is preferably spherical. When the light-diffusing layer 45 having the uneven surface is formed by coating, the organic-based fine particles are used as the light-diffusing material 452 because the cross-linked organic fine particles having a specific gravity close to that of the fat-soluble solvent are present in the coating. (_ The difference between the refractive index of the light-diffusing material 452 and the light-transmitting resin is suppressed, and the difference in refractive index is preferably Λ ^ 0.09, particularly preferably 0.05 to 〇. The haze of the diffusion layer 45 is 5G to 85%. Preferably, the light diffusion material in the 45th layer is first expanded.

Ml is 15 to 35 plus %. 2 2 = set relative to the light transmissive resin. , the content of loose material of the optical expansion material is less than 15, and (4) the haze of the Guangzheng layer 45 will be lower than that of the 19th 丄 revision date: the 2745 pifl m 96133810 of July 27, 100, the tendency of the angle drop, and the light diffusion The tendency to decrease. The haze of the light diffusion layer 45 is more preferably 60 to 85%. The weight average particle diameter m of the two bulk materials 452 is: ^^6μΠ1', which is good Wm. When the light diffusion diffusion 45 particle diameter D1 is less than 1 μΐΏ, the light may be colored to reduce the color temperature of the surface light source device, or the shielding property may be lowered; if the weight average particle light of the light diffusion material 452 is expanded by one ^ For the uneven surface of the light-diffusing layer 45, the average peak-to-peak interval S of the irregularities according to the _ Β _ 94 must be less than the material 5 〇 μηι, preferably 45 or less. Moreover, the average peak top is between 5 and 5 on average. Further, with respect to the uneven surface of the light-diffusing layer 45, according to JIS B 0601-1994, the ten-point flatness Rz must be formed to be 4 μηη or less, and more preferably, it is formed to be equal to or less than /m'. Formed to be less than or equal to 2 divisions. For the suppression of glare, (4) optical expansion (four) wonderful _ the above-mentioned way to form a 2:5 concave and convex surface is particularly important. The ten-point average roughness & is preferably formed to be larger than the enthalpy. 5 哗, and more preferably formed to be equal to or greater than that for obtaining good light diffusibility and defect concealability, and is formed in the above manner. The uneven surface of the light diffusion layer 45. Further, with respect to the uneven surface of the light-diffusing layer 45, according to the jisb〇6〇i-1994, the concave-closed partition is separated (the average length of the wheel-line element is 20 1354122 25645 pifl is the first job machine duck cake makeup 丨_July 27th J丄S: Good" is formed to be less than or equal to 16〇qing, more preferably less than ί120μηη, and even better than 100 handsome, especially good 疋 less than or equal to 80μπι. The fine particles such as the light-diffusing material 452 may be in the coating liquid === into the secondary particles 453. This aggregation is based on the sp value of the light-based material 452 and the light-transmitting resin 451 and the solvent (dissolved) Second, the difference in affinity caused by the difference, or the surface potential of the light-diffusing material, the viscosity of the coating during coating, or the length of the homogenization (iej = time until the start of straightening) or leveling agent = ί The viscosity is preferably in the range of 30 to 120 - 0 mPa, s. When the film is applied in the in-plane direction of the coating film, the average interval of the uneven surface becomes larger. Ten points average of the concave and convex surface: In addition, in order to suppress the glare phenomenon, it is ideal = ideal position In the circular area, === less than or equal to 2', and more preferably, the half of the heart is more than the arbitrary position of the light diffusion layer 45, and the remainder is equal to or greater than 20 _. The number 2 of the particles 453 is equal to 3, preferably 2 or less, and more preferably the 'multiple light diffusing material 452 shown in the plan view of the small problem, the planar shape of the aggregated secondary particles 453- Therefore, the size of the primary particle 453 is represented by the long diameter D. 21 1354122 25645pifl Correction date: July 27, 2007 is the number 9613310 Chinese description No book marking correction is in the above embodiment The light diffusion layer 45 is formed by applying a coating material containing the light transmissive resin 451 and the light diffusion material 452, and the haze of the light diffusion layer 45 can be easily adjusted by changing the amount of the light diffusion material 452 added, and can be easily adjusted. It is preferable that the surface light source device has properties such as brightness and viewing angle, etc. However, in the present invention, a light diffusion layer having a concave-convex surface may be formed by other methods. For example, chemical surging or sand blasting or pressing may be used in advance. Emboss roll, etc. The surface of the light-transmitting substrate is roughened to form an uneven surface. Further, it may be separately coated on a light-transmitting substrate, and a coating film containing a light-transmitting resin may be added and transferred using a mold. For example, the surface uneven structure of the light-transmitting resin film may be provided. Two or more of the above methods may be used in combination to form a composite uneven surface having a different uneven structure. Although the case of the matrix formation layer 44 of the light-transmitting substrate 43 has been described, in the present invention, the light-transmitting substrate 43 and the matrix formation layer 44 may be composed of a common member. That is, a matrix can be formed on the surface of the light-transmitting substrate 43. At this time, the light-transmitting substrate 43 can be composed of a synthetic resin having a high light transmittance. As such a synthetic resin, a mercapto acrylic resin, an acrylic resin, a polycarbonate resin, a polyfluorene-based resin, or a vinyl-based resin is used. In particular, since the fluorenyl-based acrylic resin has high light transmittance and excellent heat resistance, mechanical properties, and moldability, it is the most preferable. The methacrylic resin is a resin containing decyl methacrylate as a main component, and preferably decyl methacrylate is 8 Å by weight or more. Fig. 3 is a schematic view showing the in-plane polarized light caused by the prism sheet 4 1 1354122 • 25645pifl. For the 96th 丨 3381 中文 Chinese description, there is no book line correction. This correction period: loo year July 27曰. In Fig. 3, 'an example of the traveling direction of the peak light (light corresponding to the peak of the outgoing light distribution) from the light guide 3 in the XZ plane is shown. Most of the crest light that is obliquely emitted from the light exit surface 33 of the light guide 3 at an angle α is incident on the first meander surface 411a of the prism array 411, and is totally reflected by the substantially inner surface of the second prism surface 411b, and then substantially illuminates the light exit surface. The travel in the normal direction of 42 is diffused by the surface of the uneven portion of the main portion of the light diffusion layer 45, and is emitted. Moreover, in the YZ plane, it also has the above

The action of the array of the light guide back surface 34 can sufficiently increase the brightness in the normal direction of the light-emitting surface 42 in a wide range of regions. Further, the shape of the pupil faces 411a and 4Ub of the prism row 411 of the crotch panel 4 is not limited to a complete plane, and may be a profiled convex polygonal shape or a convex curved shape, thereby further achieving high luminance and narrow viewing angle. . For the cymbal 4, 'in order to accurately produce the desired array shape, to obtain stable optical performance, and to suppress the wear and deformation of the mirror portion when assembling and using the source device, == flat or top curved surface. In this case, it is preferable to suppress the decrease in the surface light St degree or to suppress the occurrence of the brightness due to the image sticking phenomenon, and it is preferable to set the width of the wide top surface portion of the curved portion of the 3nf portion to be less than or equal to the width of the top surface portion of the curved surface portion. Or equal to Ιμπι. ..., specializing in the 2nd division, and further preferably the formation of the matrix member having the shape transfer surface as described above, the shape of the transfer surface can be converted into the surface of the machine. The 稜鏡23 is formed by the 稜鏡23 1354122 25645pifl having the 稜鏡 411. The date of correction is: July 27, 100 is the number of the illuminating surface 41 formed by the no-line stenciling surface. Fig. 5 is a schematic view showing an embodiment of formation of a matrix of cymbals. In Fig. 5, reference numeral 7 denotes a mold member (roller mold) in which a shape transfer surface which can be transferred to the light incident surface 41 is formed on a cylindrical outer peripheral surface. This roll mold 7 can be made of a metal such as aluminum, copper or steel. Fig. 6 is a squint schematic view of the parent mold 7. A shape transfer surface 18 is formed on the outer circumferential surface of the cylindrical roller 16. Fig. 7 is an exploded perspective view showing a modification of the roll die 7. In this modification, 'the outer peripheral surface of the round-shaped roll 16 is wound (the thin-shaped mold member 15 is fixed. The shape transfer surface is formed on the outer surface of the thin-plate-shaped mold member 15 as shown in FIG. The light-transmissive substrate 9 (43) is supplied to the roll mold 7 along the outer peripheral surface thereof, that is, the shape transfer surface, and between the roll mold 7 and the light-transmitting substrate 9 'from the resin tank 12 via the nozzle 13 The active energy ray-curable composition 10 is continuously supplied. On the outer side of the light-transmitting substrate 9, a nip roll 28 for making the thickness of the supplied active energy ray-curable composition 1 均匀 uniform is provided. As the nip roller 28, a metal roll, a rubber roll, etc. can be used. Moreover, in order to make the thickness of the active energy ray-curable composition 1 均匀 uniform, it is preferable that the roundness and surface roughness of the one roll 28 pass. High-precision machining in the case of using rubber, in the case of _, it is preferable that (4) the hardness is 6 degrees or more. The nip roller 28 must accurately adjust the thickness of the active energy ray-curable group f, 10 The operation is performed by the pressure mechanism u. As the pressure mechanism 11, the hydraulic cylinder and the air pressure can be used. Cylinder, various screw mechanisms, etc., in terms of the simplicity of the mechanism, it is better that the air pressure is 24 1354122 25645pifl. The revised period: July 27, 100 曰 ' is the number 9613381 中文 Chinese description no book line correction The air pressure can be controlled by a pressure regulating valve, etc. In order to fix the thickness of the obtained prism portion, it is preferable to form an active energy ray hardening composition which is supplied to the mold 7 and the through substrate 9 . The material 10 is maintained at a fixed viscosity. In terms of the viscosity range, it is generally preferably in the range of 20 to 3000 mPa.s, and more preferably in the range of 1 to 1000 mPa's. The viscosity of the active energy ray-curable composition 1 设为 is set to 20 mPa·s or more, and it is not necessary to set the nip pressure extremely low or to set the forming speed extremely fast in order to fix the thickness of the prism portion. When the setting is extremely low, there is a tendency that the pressure mechanism u cannot maintain stable operation, and the thickness of the prism portion becomes unfixed. Moreover, if the forming speed is extremely fast to the right, there is insufficient irradiation of the active energy ray. Active energy The hardening of the wire-curable composition tends to be incomplete. The other surface can be made by setting the viscosity of the active energy ray-curable composition 1 小于 to 3000 mpa·s or less. The fine portion of the shape transfer surface structure of the roll mold is sufficiently spread, so that it is difficult to accurately transfer the lens 幵v shape, and the grain is liable to be defective due to the incorporation of bubbles, and the productivity is not deteriorated due to the extremely low molding speed. Therefore, in order to make the active energy ray hardened, and the viscosity of the product 1 保持 remains fixed, it is preferably outside the resin tank 12. 卩 or a sheath heater, a warm water jacket, etc. The heat source device controls the temperature of the hardenable composition. After the active energy ray-curable composition i 0 is supplied between the roll mold 7 and the light-transmitting substrate 9, the active energy ray-curable composition 1 is lost to the roll mold 7 and the light-transmitting substrate 9 In the state between the two, the active energy ray irradiation device 14 transmits the active energy ray through the light-transmitting substrate 9 to correct the active energy ray 25 1354122 25645 pifl: July 27, 2007 is No. 96133810 The book scribing correction is performed by polymerizing and hardening the curable composition 10, and transferring it by a shape transfer surface formed on the roll mold 7. As the active energy ray irradiation device 14, a chemical lamp for chemical reaction, a low pressure mercury lamp, a high pressure mercury lamp, a metal dentate lamp, a visible light halogen lamp, or the like can be used. As the irradiation amount of the active energy ray, it is preferred that the cumulative energy at a wavelength of 200 to 600 nm is about 01 to 5 〇 J/cm 2 . Further, the irradiation environment of the active energy ray may be in the air or in an inert gas atmosphere such as nitrogen or argon. Then, the ruthenium sheet composed of the light-transmitting substrate 9 (43) and the matrix-forming layer (44) formed of the active energy ray-curable resin is released from the roll mold 7. Referring back to Fig. 1, the primary light source 丨 is a linear light source extending in the γ direction. As the primary light source 1, for example, a fluorescent lamp or a cold cathode tube can be used. At this time, as shown in Fig. 1, the primary light source 丨 is not limited to being disposed at a position opposed to one side end surface of the light guide body 3, and may be disposed on the opposite side end surface as needed. The light source reflector 2 is means for reducing the light loss of the primary light source 1 and guiding the light of the primary light source 1 to the light guide 3. As the material of the light source reflector 2, for example, a plastic film having a metal vapor-deposited reflective layer on its surface can be used. As shown in Fig. 1, the light source reflector 2 avoids the cymbal 4, and the outer surface of the end edge portion of the light reflecting element 5 passes through the outer surface of the primary light source 1 and is wound around the edge of the light exit surface of the light guide 3. On the other hand, the light source reflector 2 may be wound from the outer surface of the end edge portion of the light reflecting member 5 through the outer surface of the primary light source 1 to the edge portion of the light exiting surface of the cymbal 4. The reflection member similar to the light source reflector 2 may be attached to the side end surface other than the light incident end surface 31 of the light guide 3. 26 1354122 25645pifl Correction period: July 27, 100 For the Chinese version of No. 96133810, there is no book marking correction. As the light reflecting element 5', for example, a plastic sheet having a metal plating plating layer on the surface can be used. In the present invention, as the light-reflecting member 5, a material such as a light-reflecting layer formed by metal deposition or the like on the back surface 34 of the light guide 3 is used instead of the reflection sheet. The transmissive type is disposed on the light-emitting surface (the filament 42 of the prism sheet 4) including the surface of the secondary light source reflector 2, the light guide 3, the crucible 4, and the light reflection member 5 as described above. Liquid crystal panel (liquid crystal display element)

8' thereby constitutes a liquid crystal display device in which the Linfa_surface light source device is used as a backlight module. The observer can observe the liquid crystal display device from above. The light emitted from the light-emitting surface 42 of the cymbal 4 of the surface light source device is incident on the liquid crystal panel, and the human-emission surface 81' is modulated by the image information signal, and then emitted from the observation surface 82. It is preferable to have an anti-glare function and suppress glare, and it is preferable to make the viewing surface 82 have a 60-degree gloss value (JIS z 8741).

G1 is 25 Å or more, more preferably 3 Å or more, and particularly preferably a face having a thief ship (a surface subjected to matting treatment or anti-glare treatment) of more than 35 Å. Further, it is preferable that the observation surface 82 is a glare surface (a surface having no matte treatment or anti-glare treatment) having a 60-degree gloss value G1 of 9 or more. Further, from the viewpoint of preventing glare, it is preferable that the incident surface 81 is an anti-glare surface, and the ratio G· of the 6-degree gloss value G1 of the observation surface 82 to the 60-degree gloss value (f) of the incident surface 81 is It is greater than or equal to i, 吏 is better than or equal to U, and particularly preferably greater than or equal to L4. Further, from the viewpoint of preventing glare, it is preferable that the ten-point average roughness Rz of the observation surface 82 is 2 μm or less. In the present embodiment, the buckstrip 4, in particular, the light diffusing layer 45 has 27 1354122 25645 pifl. The date of revision: July 27, 2007 is the number 9613310. The glare of the liquid crystal display device does not cause a significant drop in the brightness of the face-lighting dislocation display device. In the above embodiment, a cymbal having a matrix is used as the lens having the lens column> {' However, the present invention can be used with a transmissive other than the lens (for example) having a g(tetra) lens (four) lens. Wait. In the above yoke form, in particular, the unevenness of the uneven surface of the light diffusion layer 45 is observed. When the p-peak average interval S is 5 Å or less, the light diffusion layer 45 of the prism sheet can sufficiently exhibit the light diffusion function, so that it is not necessary to dispose the light diffusion sheet thereon. However, in the present invention, in particular, when the average peak-to-top interval s of the unevenness of the uneven surface of the light-diffusing layer 45 exceeds 5 Å, the glare of the liquid crystal display device can be reduced by using another light-diffusing sheet in combination. Further, the light diffusibility can be further improved, so that the brightness can be improved. The other light diffusing sheet used in combination is disposed between the cymbal sheet and the liquid crystal panel such that light emitted from the second surface of the cymbal sheet is incident thereon. At least one surface of the light-diffusing sheet is a concave-convex shape surface, and the average peak-top spacing S of the uneven-shaped surface is 50 μm or less, preferably 45 μm or less, and the ten-point average roughness rz is 4 or less. Preferably, it is less than or equal to 3 μηη, and more preferably less than or equal to 2 μηι. Forming the uneven shape surface in such a manner is particularly important for suppressing glare. The light-diffusing sheet is exemplified as a light-diffusing sheet in which a light-diffusing functional layer is provided on one surface of a light-transmitting substrate. Here, the light-diffusing functional layer is formed by including a light-transmitting light-diffusing material in the light-transmitting resin. The uneven-shaped surface is formed by projecting a light-diffusing material from the surface of the light-transmitting resin. As a light-transmitting resin and a light-diffusing material, it can be used as 28 1354122. 25645pifl. Correction date: July 27, 100 • For the case of the light-diffusion layer of the 稜鏡 961 338 Photoresist and light diffusing material. The haze Hz of the light-diffusing functional layer is preferably from 20 to 7 %, more preferably from 25 to 65%, and still more preferably from 30 to 60%. The reason is that when the haze

When Hz is less than or equal to 20%, the viewing angle will decrease and the glare will become stronger. When the Hz exceeds 70 〇/〇, the brightness will decrease. The weight average particle diameter D1 of the light-diffusing material having a concave-convex shape surface is preferably 1 to 8 μm, more preferably 1 to 6 μm, particularly preferably i - if the weight average particle diameter D1 of the light-diffusing material is smaller than 丨In the case of μιη, sometimes the light passing through the light diffusion functional layer is colored to cause the color of the surface light source device to be lowered, or the defect concealability is lowered; and if the light diffusion material has a weight average particle diameter D1 of more than 8 μm, There is a tendency for glare to become stronger. [Examples] Hereinafter, the present invention will be more specifically described based on examples. [Example 1] A prism sheet, a surface light source device, and a liquid crystal display device as shown in Fig. 1 to Fig. 3 were produced as follows. As the light-transmitting substrate 43, a PET film (manufactured by Toyobo Co., Ltd., trade name: A43〇〇) having a thickness of 188 μm was used. As the light-transmitting resin (adhesive resin) constituting the light-diffusing layer, a polyester (pEs) having a refractive index of 丨55 is used (manufactured by Toyobo Co., Ltd., trade name Vyl〇n#2〇〇) to make Vyl〇 n #200 was dissolved in a mixed solvent of MEK (methyl ethyl ketone) and toluene (mixing ratio of 5 Å each by weight) so as to have a concentration of 26 wt% to prepare a coating liquid. As a light diffusing material, the refractive index is 149 and the weight average particle 29 1354122 25645pifl is the 9613338. The Chinese version of the book has no correction for the revision of the book. The correction period is: PMMA cross-linking with a diameter of 3.2 μηη on July 27 The PMMA crosslinked fine particles were added to the coating liquid so as to be 19.7 wt% with respect to the light-transmitting resin, and then stirred and mixed to prepare a coating liquid containing a light-diffusing material (viscosity: 50mPa_S). Using the gravure coating method, the coating liquid was applied onto the PET film at a line speed of 15 m/min and dried to have an average residence of 5 μηι after drying the solvent, thereby using PET. A light diffusion layer having a concave-convex structure based on a light diffusion material, that is, a light diffusion layer having a concave-convex surface is formed on one surface of the film. For the obtained light-diffusing layer, a haze meter was attached using a haze meter (manufactured by Nippon Denshoku Co., Ltd., trade name: NDH2000) to mount the haze meter so that the light-diffusing layer faces the light-receiving side (JIS K 7316) Tt and haze (JISK7136) Haze. As a result, the total light transmittance was 92 6%, and the haze was 64.7%. In addition, the local peak-top average interval s, the average interval Sm, and the ten-point average thickness of the unevenness of the uneven surface of the light-diffusing layer were measured under the following conditions using a surface roughness meter (trade name: SURFCOM 1500DX-3DF). Degree RZ (HSB 0601 - 1994). Measurement category Thickness measurement Length 5.0 mm Cut-off category 2RC (phase non-compensation) Tilt correction least square straight line correction cutoff wavelength 0.8 mm Measurement magnification χ20Κ Measurement speed 0.15 mm/s Tip end radius 1 μιη 30 丄25645pifl No. 9613310 Description No book line repair ^ Correction period: scale July 27 P5 Sififi 'local peak average interval S is 27.G μπΐ, mean

Sm is 38.3 μιη, ten-point average roughness r is manufactured by the company, the trade name is condensed light to observe the light-diffusing material in the light-diffusing layer = ί is the position of the light-diffusing layer at any position in the 犠ί domain, long diameter The secondary particles y _ „ 〇, ΰ 8 of the optical diffusion phase of the light diffusion layer

"," shows the short side is handsome and the long side is the same as the 15th division. /. 匡, the inspection size reference (the following microscope photo is also in the thickness of 1.0mm, 400mmx690mm based on the JIS standard The surface of the sheet of the three types of brass forms a shape transfer surface having a shape corresponding to the shape of Wei Qing's face, and obtains a mold member. Here, the target shape of the prism column forming surface is arranged in parallel with a pitch ρ = 5 〇 μπι A plurality of prism rows 411 having a apex angle of θ = 65. Then, a stainless steel circular Φ cylindrical roller having a diameter of 220 mm and a length of 450 mm is prepared, and a mold member is wound around the outer peripheral surface thereof, and fixed by a screw to obtain a roller mold. Between the roll die 7 and the rubber roller, a light-transmitting substrate provided with the light-diffusing layer is supplied along a roll die, and the light-transmitting substrate is sandwiched between the rubber roller by an air-pressure cylinder connected to the rubber roller On the other hand, the viscosity of the following ultraviolet curable composition was adjusted to 3 〇〇mPa'S/25 ° C: 50 parts by weight of phenoxyethyl acrylate (VISCOAT, manufactured by Osaka Organic Chemical Industry Co., Ltd.) #192) ; 50 parts by weight of double hope A - Diepoxy-Acrylate (Ling 31, manufactured by Gongrong Company, Oil and Fat Chemical Industry Co., Ltd.) 25 1 135 126 25645 Pifl No. 96133810 Chinese Description No book line correction This revision period: Η»年27月27日氧酯3000A); 1.5 Parts by weight of 2-hydroxy-2-methyl-1-phenyl-propan-1-one (Darocure 1173, manufactured by Ciba Geigy Co., Ltd.): The ultraviolet curable composition was supplied to the rubber mold and lost to the mold. a surface of the light-transmitting substrate that is opposite to the surface on which the light-diffusing layer is provided. The ultraviolet curable composition is sandwiched between the roll mold and the light-transmitting substrate while rotating the roll mold. In this state, ultraviolet rays are emitted from the ultraviolet irradiation device to polymerize and cure the ultraviolet curable composition, and the prism array pattern of the shape transfer surface of the roll mold is transferred. Thereafter, the prism sheet is separated from the roll mold to obtain the prism sheet. The cymbal obtained by the method is cut into a size of 14.iw (wide), as shown in FIG. 1 and FIG. 2, and the cut cymbal is placed on the side so that the cymbal is formed face down. The size of the cold cathode tube is 14.1 W (width) A surface light source device is obtained by covering the other side surface and the back surface with a reflection sheet on the light exit surface of the acrylic resin light guide. In the surface light source device, the cold cathode tube is illuminated, and a luminance meter is used (T〇pc〇n The company manufactures the trade name BJV [—7] to determine the normal brightness and half value angle. The result is 'normal line exemption is 3160 Cd/m2, and the half value angle is 18.7. The surface light source device obtained in the above manner The transmissive liquid crystal panel is placed on the cymbal sheet. The characteristics of the liquid crystal panel are as follows: an observation surface (anti-glare surface) which is produced by a gloss meter (manufactured by Nippon Denshoku Industries Co., Ltd., trade name VGS-3GGA) The 60-degree gloss value 〇1 is 48. The 60-degree gloss value of the incident surface (anti-glare surface) is 31.2, the ratio of G1/G2 is 1.6, and the 10-point average roughness Rz of the observation surface is 0.8 handsome, and the number of pixels XGA ( She (10) Graphs Array) 14.1W (wide) LCD panel. The liquid crystal display device 1354122 25645pifl Correction date: 100 years July 27曰 is the 961333810 Chinese description No book scribing correction This device makes the surface light source device emit light 'Using the liquid crystal panel to display the white image at this time to observe the glare, and found Almost no glare, and (4) a striking enamel with a very smooth texture. Example 2 The light-diffusing material of Example 2 was used in the light-diffusing material used in Example 1 to be doped with a weight ratio of 3 (%), a refractive index of 149, and a weight average particle diameter of 5.3. Μιη & pMMA crosslinked microparticle material 'This light diffusing material is added to the coating liquid so that it is 20.0 wt 〇 / 〇 ' with respect to the light transmissive resin, thereby adjusting the viscosity of the coating liquid to 55 (10), in addition to this A light diffusion layer was formed in the same manner as in Example 1 except for the same. With respect to the obtained light-diffusing layer, total light transmittance and haze were measured in the same manner as in Example 。. As a result, the total light transmittance was 93.3%, and the haze was 70.4%. Further, in the same manner as in the example i, the local peak-top average interval s, the average interval Sm, and the ten-point average roughness Rz of the unevenness of the uneven surface of the light-diffusing layer were measured. As a result, the local peak-top average interval S was 27.6 μηη, the average interval Sm was 53.9 μηη, and the ten-point average roughness Rz was 3·2 μιη. Further, the state of aggregation of the light-diffusing material in the light-diffusing layer was observed in the same manner as in Example i. As a result, the number of secondary particles having a major axis longer than 30 μm in a circular region having a radius of 7 μm at any position on the surface of the light diffusion layer is at most one. Fig. 9 shows an optical microscope photograph of the light-diffusing layer. Further, a matrix formation layer was formed in the same manner as in Example 1 to obtain a prism sheet, and the pellet was used in the same manner as in Example 1 to prepare a 33 1354122 25645pifl correction period··100 July 27 No. 96133810 Chinese description of the book without a line correction, light source device. The surface light source m is measured in the same manner as in the embodiment 秘 and half (four). The result was 3058 Cd/m2 and the half value angle was 19.4°. Further, a liquid crystal display device was produced in the same manner as in Example i using this surface light source device. In the silk crystal display device: When the glare was observed in the same manner, it was found that almost the reduction of the appearance of the image was obtained with a very smooth texture. Further, in Example 3, a wei wafer panel was placed on a ruthenium of a surface light source device fabricated in the same manner as in Example 1. The liquid crystal panel (4) has a 6-degree gloss value G1 of 96.9 as measured surface (glare surface) measured in the same manner as in the embodiment i, and a 6 (degree) gloss value G2 of the incident surface (anti-glare surface) is 31.3, the ratio of G1/G2 is that the ten-point average roughness Rz of the observation surface is 0.02 μηη, and the liquid crystal panel is a 14%% crystal panel of the pixel number XGA. In the liquid crystal display device, when the glare of the glare was observed in the same manner as in the example, the glare was unobtrusive, and the texture was smooth and sturdy. Eight Comparative Example 1 As a light diffusing material, a PMMA crosslinked fine particle having a refractive index of L49 and a weight average particle size of 7.8 μη was used, and the PMMA crosslinked fine particles were added to a coating liquid (viscosity of 71 mPa·s). It is made to be 25 wt% ' with respect to the light-transmitting resin and coated at a line speed of 1 〇 m/min. 34 1354122 25645 pifl -. For the 96133810 Chinese description, no book line correction. Revision date: 100 years July 27th. Other than this, a light diffusion layer was formed in the same manner as in Example 1. With respect to the obtained light-diffusing layer, total light transmittance and haze were measured in the same manner as in Example 1. As a result, the total light transmittance was 94.4%, and the haze was 79.6%. Further, in the same manner as in the first embodiment, the local peak-top average interval s, the average interval Sm, and the ten-point average roughness RZ of the unevenness of the uneven surface of the light-diffusing layer were measured. As a result, the local peak-top average interval S was 57.4 μπι', the average interval Sm was 102·1 μηι, and the ten-point average roughness Rz was 7·2 μιη. Further, the state of aggregation of the light-diffusing material in the light-diffusing layer was observed in the same manner as in the example i. As a result, the number of secondary particles having a long diameter of 30 μm or more in a circular region having a radius of 70 μm at any position on the surface of the light diffusion layer is at most 5. Fig. 1A shows an optical micrograph of the light diffusion layer. Further, a prism array forming layer was formed in the same manner as in Example 稜鏡, and a ruthenium sheet was obtained, and the enamel sheet was used and a surface light source device was fabricated in the same manner as in Example 。. In the surface light source device, normal brightness and half value angle were measured in the same manner as in Example 。. As a result, the normal brightness is • 2621 Cd/m2 ′ and the half value angle is 22 2 . . Further, a liquid crystal display device was produced in the same manner as in the first embodiment using this surface light source device. In the liquid crystal display device, when the glare was observed in the same manner as in Example 1, it was found that there was a very strong glare phenomenon, and only the enamel which could not be obtained was obtained. Comparative Example 2 As a light diffusing material, a refractive index of 149 and a weight average particle of 35 1354122 25645 pifl were used. Correction date: July 27, 100, No. 96133810 Chinese Description No book marking correction from PMMA crosslinked material of 8.0 μηι The working time is sub-six ^ w , the micro-particles are added to the coating liquid (viscosity is 53mpa.s), and the inert resin is coated with L to make the solvent dry after the rTM " Relative to the light diffusion layer of (4), the actual light transmittance and haze are obtained. The unevenness of the uneven surface of the light-diffusing layer is determined as follows: the same method measures the average interval Sm and the ten-point average roughness interval S is 41.5 μm, and the average interval Sm is 63 f i and the top average degree Rz is 9.9 μη. Further, the condensed state of the light diffusing material in the water diffusion layer was turned over by the same method as in Example 1. The circular expansion layer with a radius of 7 〇 μη at any position on the surface of the material has a maximum number of secondary particles of 3 〇 4. Figure Optical micrograph of the diffusion layer. Further, in the same manner as in the embodiment i, the rib was obtained to obtain the cymbal sheet. The cymbal sheet was used and the same as that of the embodiment W = green in the surface light source device, in the same manner as in the first embodiment. The way of the line is pure and half-valued. The material was 2373 Cd/m2 and the half value angle was 22 4. . In the case of %, the surface light source device was used to produce a liquid crystal display mixture in the same manner as in the examples. When observing the glare in the same way as the recording device 36 1 , it was found to be very strong = 1354122 . 25645pifl • For the 9613 兕 1 中文 Chinese description no book line correction This revision date: July 27, 1 Japanese elephants can only obtain enamel that cannot be used. Moreover, since the total light transmittance is lowered, the normal brightness is lowered to 2373 Cd/m2, so that only a very dark surface can be obtained. Comparative Example 3 A light-diffusing material was added to a coating liquid (viscosity: 41 mPa·s) so as to be 15 wt% with respect to the light-transmitting resin, and coated so that the average thickness after drying the solvent was A light diffusion layer was formed in the same manner as in Example 1 except that 15 μm was used. For the obtained light-diffusing layer, the total light transmittance and haze were measured in the same manner as in Example i. As a result, the total light transmittance was = .5%, and the haze was 73.9%. Further, in the same manner as in the example j, the local peak top average S of the unevenness of the uneven surface of the light diffusion layer, the average interval Sm, and the ten point average thickness rule 2 were measured. As a result, the local peak-top average interval S was 61.0 μm, the average interval 8111 was 1491 μm, and the ten-point average roughness Rz was 3.4 μm. Further, in the same manner as in the first embodiment, the correction of the light diffusion layer (4) of the light diffusion layer was observed. As a result, the number of secondary particles having a long diameter of 30 大于 or more in a circular region having a radius of 7 〇 μη at an arbitrary position on the surface of the light diffusion layer is one. Fig. 12 shows an optical micrograph of the light-diffusing layer. Further, a matrix formation layer was formed in the same manner as in Example 1 to obtain a prism sheet. The wafer was used as a surface light source device in the same manner as in Example 使用. In the face money device, the line brightness and the half value are measured in the same manner as in the embodiment i. As a result, 37 1354122 25645pifl is No. 96133810 Chinese description No book line correction This revision date: July 27, 1978 2987 Cd/m2, half value angle is 20.4. . Further, a liquid crystal display device was produced in the same manner as in Example 使用 using this surface light source device. In the liquid crystal display device, when the glare was observed in the same manner as in the first embodiment, it was found that there was a very strong glare phenomenon, and only the image quality which could not be obtained was obtained. Comparative Example 4 A transmissive liquid crystal panel was placed on a prism sheet of a surface light source device fabricated in the same manner as in Comparative Example 1. The characteristics of the liquid crystal panel are as follows: The 6-degree gloss value G1 of the observation surface (anti-glare surface) measured in the same manner as in the first embodiment is a 6-degree gloss value of the incident surface (anti-glare surface) of 22_3 ' G2 is 29.8, G1/G2 ratio is 0.75, and the ten-point average roughness Rz of the observation surface is 2·29 μιη '14.1 W (wide) liquid crystal panel of pixel number XGA. In the liquid crystal display device, when and with the embodiment! When the glare was observed in the same manner, a stronger glare phenomenon than that of Comparative Example i was observed, and only the image quality that could not be obtained was obtained. Example 4 As a light-transmitting resin constituting the light-diffusing layer, a propylene resin having a refractive index of 1.49 (manufactured by Mitsubishi Rayon Co., Ltd., trade name TF-8) was used to dissolve TF-8 at a concentration of 20 wt%. A light-diffusion was formed in the same manner as in Example j except that a coating liquid having a viscosity of 60 mPa·s was prepared in a mixed solvent of MEK (methylethyl _) and toluene (50 wt% of each of the mixing ratios). Floor. 38 25645pifl _ 9613· Chinese description No book line correction This correction date: July 27, 1 (8). For the obtained light diffusion layer, the total light transmittance and haze were measured in the same manner as in Example 1. . As a result, the total light transmittance was 95.6%, and the haze was 8 〇·4. /❶. Since the translucent resin and the light diffusing material have the same refractive index, a very high total light transmittance can be obtained. Further, the peak-to-peak average interval S, the average interval Sm, and the ten-point average roughness Rz of the unevenness of the uneven surface of the light-diffusing layer were measured in the same manner as in the first embodiment. As a result, the local peak-top average interval S was 43.5 μηη, the average interval Sm was 53.3 μηι, and the ten-point average roughness Rz was 3 9 . Further, the aggregation state of the light-diffusing material in the light-diffusing layer was observed in the same manner as in the practice of =1. As a result, the maximum number of secondary particles having a long diameter of 3 or more in a circular region having a radius of 7 〇 at any position on the surface of the light-diffusing layer is one. Further, a matrix formation layer was formed in the same manner as in Example ,, and a crepe sheet was obtained, and the enamel sheet was used and a surface light source device was fabricated in the same manner as the embodiment. In the surface light source device, normal brightness and half value are measured in the same manner as in the embodiment i. As a result, the normal brightness was 2772 Cd/m2' and the half value angle was 218. . Further, a liquid crystal display device was produced in the same manner as in Example 使用 using this surface light source device. In the liquid crystal display device, when the glare was observed in the same manner as in the example, it was found that there was almost no glare, and a conspicuous enamel having a very smooth texture was obtained. Table 1 below shows the results of the above respective examples and comparative examples. 39 1354122 25645pifl is the 96133810 Chinese description no book line correction This revision date: July 27, 100 glare phenomenon 〇〇〇〇 XXXX Half-value angle 1 18.7 19.4 Same as Example 1 CO CS 22.2 1 22.4 1 20.4 Comparative Example 1 Same 3 3160 3058 2772 2621 2373 2987 Number of secondary particles rH r~i •λ ο (2 1 oo ψ-^ <N 〇\ to (Ν 〇\ 〇% 5 & ifl 1日1 38.3 53.9 53.3 102.1 c<5 so 149.1 in τ λ. 27.0 27.6 43.5 57.4 41.5 1 61,0 Ε 64.7 70.4 80.4 79.6 73.4 73.9 Ε 92.6 93.3 95.6 94.4 85.5 95.5 Light diffusing material cultivating 19.7 1 total 20 | 19.7 «η (Ν « ή r^· 5* 4g C'l CO 3.2 (70%) ' 5.3 (30%) CN CO 00 ο οό ΓΊ CO Adhesive resin PEs Same as acrylic PEs ρΐ-ί- 1 Same as above 1 Example 11 1 Appreciation 2 1 1 Example 3 I Example 4 Comparative Example 1 丨 Comparative Example 2 1 1 Comparative Example 3 1 Comparative Example 4 40 25645pifl Revision date: July 27, 2007 is No. 96133810 Chinese description No book secant correction [Pattern BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a cymbal sheet as an embodiment of a lens sheet of the present invention, using the same Figure 2 is a partial cross-sectional view of Figure 1. Figure 3 is a partial cross-sectional view of the prism sheet and the light guide body. Fig. 4 is a schematic plan view showing a secondary particle, Fig. 5 is a schematic view showing a method of manufacturing a cymbal sheet, Fig. 6 is a schematic perspective view showing a roller die for manufacturing a cymbal sheet. Fig. 8 is an optical micrograph of a light diffusing layer, Fig. 9 is an optical micrograph of a light diffusing layer, Fig. 10 is an optical micrograph of a light diffusing layer. Fig. 11 is an exploded perspective view of a light diffusing layer. It is an optical micrograph of the light diffusion layer. Fig. 12 is an optical micrograph of the light diffusion layer. [Main component symbol description] 1 : Primary light source 2: Light source reflector 3: Light guide 4: Prism sheet 5: Light reflection element 7 : Mold member (roller mold) 1354122 25645pifl Correction date: July 27, 2007 is No. 96133810 Chinese description No book marking correction Ben 8: Liquid crystal panel 9, 43: Translucent substrate 10: Active energy Wire hardening composition 11 : Pressure mechanism 12 : Resin tank 13 : Nozzle 14 : Active energy ray irradiation device 15 : Thin plate-shaped mold member 16 : Cylindrical shape Kun Kun 18 : Shape transfer surface 28 : Pinch 31 : Light incident end face 32: side end surface 33: light exit surface 34: back surface 41: light incident surface 42: light exit surface 44: prism array forming layer 45: light diffusion layer 81: incident surface 82: observation surface 411: array 411a, 411b: edge Mirror 451: Translucent resin 1354122 25645pifl Revision date: July 27, 2007 is No. 96133810 Chinese description No book marking correction 452: Light diffusing material 453: Secondary particles

43

Claims (1)

1354122 25645pifl Revision date: July 27, 100 is the Chinese description of the number 9613381 # # VII, the scope of application for patent: A lens sheet in which a plurality of lens rows are formed in parallel on the first surface of a sheet-like light transmissive member having a second surface and a second surface, and the second surface is an uneven surface, and the uneven surface is partially The average peak interval s is 5 μm or less and the ten-point average roughness Rz is 4 μm or less, and the sheet-like light transmissive member is formed by providing a light diffusion layer on one surface of the light-transmitting substrate. The light-diffusing layer is formed by including a light-transmitting light-diffusing material in the light-transmitting resin, and the uneven surface is formed by projecting the light-diffusing material from the surface of the light-transmitting resin. In the circular region in which the radius of the light-diffusing layer is 7 μm, the number of secondary particles having a long diameter of 30 μm or more in which the plurality of light-diffusing materials are aggregated in the light-transmitting resin is Less than or equal to 3. 2. The lens sheet according to claim 1, wherein the light diffusion layer has a haze Hz of 50 to 85%. , The lens sheet according to claim 1, wherein the light-diffusing material has a weight average particle diameter Di of 丨 8 8 μη. The lens sheet according to the first aspect of the invention, wherein the difference between the refractive index Ν1 of the light-transmitting resin and the refractive index Ν2 of the upper light-diffusing material is 0.03 to 〇.1〇. A surface light source device comprising: a primary light source; a light guide body that guides light after the light emitted by the primary light source is introduced, and directs the light; and 44 1354122 . 25645pifl ' is No. 9613310 In Chinese, there is no book scribing correction. The date of the correction is as follows: The lens sheet described in claim 1 of July 27, 2011, is arranged such that the light emitted from the light guide body is incident thereon. Further, the light guide body includes a light incident end surface into which light emitted from the primary light source is incident, and a light exit surface from which the guided light is emitted, wherein the primary light source is disposed adjacent to a light incident end surface of the light guide body. The lens sheet is disposed such that the first surface faces the light emitting surface of the light guide. Φ 6. A liquid crystal display device comprising the surface light source device according to claim 5, and a liquid crystal panel that injects light emitted from a second surface of the lens sheet of the surface light source device In the above formula, the liquid crystal panel includes an incident surface on which light emitted from the second surface of the lens sheet is incident, and an observation surface on the opposite side. 7. The liquid crystal display device according to claim 6, wherein the observation surface is an anti-glare surface, and the 60-degree gloss value G1 is 25 or more. 8. The liquid crystal display device according to claim 6, wherein the observation surface is a glare surface, and the 60-degree gloss value G1 is 9 大于 or more. 9. The liquid crystal display device according to claim 6, wherein the incident surface is an anti-glare surface, and a ratio of a 60-degree gloss value gi of the observation surface to a 60-degree gloss value G2 of the incident surface G1/G2 10. The liquid crystal display device according to claim 6, wherein the ten-point average roughness Rz of the observation surface is 2 μm or less. 11. The liquid crystal display device of claim 6, further comprising a light diffusing sheet, wherein the light diffusing sheet is such that the second 45 1354122 25645pifl from the lens sheet is No. 96133810 The line correction is corrected between the lens sheet and the liquid crystal panel, and at least one surface of the light diffusion sheet is a concave-convex shape surface. The local peak-to-average interval S of the uneven shape surface is 50 μm or less and the ten-point average roughness Rz is 4 μm or less. 46 1354122 25645pifl Revision date: July 27, 100 For the Chinese version of No. 96133810, there is no book line correction. IV. Designation of representative drawings: (1) The representative representative of the case is: Figure 1. (2) The symbol of the symbol of the representative figure is briefly described: 1 : Primary light source 2: Light source reflector 3: Light guide 4: Septum 5: Light reflecting element 8. Liquid crystal panel 31: Light incident end face 32: Side end face 33: Light exit surface 34: Back surface 41: Light-incident surface 42: Light-emitting surface 81: Incident surface 82: Observation surface 5. If there is a chemical formula in this case, please disclose the chemical formula that best shows the characteristics of the invention: None 3