TW201022711A - Moire strip inhibiting film, prism sheet with moire strip inhibiting function, backlight unit and liquid crystal display device using the same - Google Patents

Abstract

The present invention provides a moire strip inhibiting film capable of film-thinned backlight units or liquid display devices in the prior art, and performs high front luminance and effectively inhibits the moire strip at the same time. The moire strip inhibiting film comprises photodiffusion layers having resin adhesives and porous particles on the surface of one side of transparency substrate, and pore volume of the porous particle is 1.00 to 2.00 ml/g, and contents of the porous particle is less than 30 parts by mass based on 100 parts by mass based of solid components of resin adhesives. In disposing prisms on structural backlight units of emerging surface side of the light guide plate toward the surface of prisms aspect; therefore, the prisms disposing on the surface side shows the excellent features. Besides, forming prisms on the opposite side by sandwiching the transparency substrate of photodiffusion layers is capable of producing prisms column with moire strip inhibiting functions.

Description

[Technical Field] The present invention relates to a wavy stripe suppressing film used as a constituent member of a backlight unit such as a liquid crystal display device (LCD). [Prior Art] A liquid crystal display device mounted on a computer, a mobile phone, a digital camera or the like is provided with a backlight unit as a means for illuminating the liquid crystal display surface from the back side. Fig. 1 shows an example of the general structure of a liquid crystal display device. In the case of the backlight unit 2, the light emitted from the light source 3 such as a cold cathode tube (CCFL) or a light-emitting diode (LED) is reflected by the reflection sheet 6 or the like, and is incident on the light guide plate 5 to be self-contained. The light emitted from the upper surface of the light guide plate 5 is condensed in the front direction by the light diffusion film (lower diffusion film) 7. The light emitted from the light-diffusing film (lower-diffusion film) 7 is incident on the surface (not the surface) of the cymbal 8 in which the array of the cymbal 8 is formed, and the self-formed yoke is formed. The surface (the surface of the surface) is ejected, and the light is concentrated in the front direction. As a result, the light emitted from the surface is incident on the lower surface of the liquid crystal module 1 having the liquid crystal display surface ® and is used as illumination from the back side. A light diffusing film (upper diffusing film) 9 is sometimes disposed between the cymbal 8 and the liquid crystal cell 1. Thus, the cymbal sheet 8 has the following effects: the emitted light from the light diffusing film (lower diffusing film) is refracted by the skewed surface formed on the transparent substrate surface to be more biased toward the front direction, thereby improving the liquid crystal display The brightness of the front direction as seen by the observer. At this time, as the direction in which the cymbal sheet 8 is disposed on the optical path, the non-tanning surface may be disposed toward the light-emitting surface of the light guide plate, and the corners of the enamel may be arranged in the opposite direction to the light-emitting surface of the light guide plate. In the case of the backlight unit, since the adjustment of the incident angle of the cymbal is not required, the non-faced surface is often disposed toward the exit surface of the light guide plate. The cymbal is generally formed by successive rows of lines that are equally spaced and parallel to maintain their angularity, and each 稜鏡 unit is generally an isosceles triangle. Therefore, if the division of the liquid crystal cells arranged at equal intervals overlaps, a visible pattern called a corrugated stripe is formed, and when the image is observed, a dark pattern is sometimes observed. The wavy stripe is a pattern that is thicker than the spacing between the pitches of the columns and the pixels of the liquid crystal panel. If such a wavy stripe is generated, a dark line is formed on the background of the liquid crystal display surface. It is the reason for the deterioration of the image quality of the display image. In particular, in the case of a liquid crystal display device requiring high definition display, suppression of wavy stripes is important. As means for making it difficult to generate wavy stripes, a light diffusion film (upper diffusion film) is inserted on the exit side of the cymbal sheet. Insertion of the upper diffusion film and the effect of reducing the wave streaks are not necessarily sufficient, and the brightness of the liquid crystal display surface is lowered. However, it has been conventionally used as an effective measure for reducing the waveform streaks. In order to achieve good light diffusion, the wavy stripes are also removed, and the suppression of the wavy stripes is considered as a secondary effect of the light-diffusing film, and is hardly designed independently. Further, in order to facilitate light diffusion, the film thickness is relatively thick. However, the liquid crystal display device has been intensively required to be thinner, and the backlight unit has been reduced in performance, and the components are reduced, the components, and the overall structure are reduced in thickness. For example, 201022711, in the case of a backlight unit in which an edge of a cymbal is disposed on the exit surface of the light guide plate, the light diffusing film can be disposed between the exit surface of the light guide plate and the cymbal sheet, and the light guide plate can be designed. A combination of the design of the cymbal and a sufficient concentrating effect. In the following description, when a cymbal having a cymbal array is inserted into the optical path, depending on the exit surface of the light guide plate, a difference in the condensing effect of arranging the ridges disposed on the exit surface of the light guide plate or toward the exit surface of the light guide plate. Fig. 2 and Fig. 3 show the arrangement of the respective optical elements of the general backlight unit of the non-faced surface in which the sheet is disposed toward the exit surface of the light guide plate. Fig. 2 is a perspective view showing a cymbal configuration of a general backlight unit, and Fig. 3 is an example of an optical path of a general backlight unit. The light emitted from the upper surface of the light guide plate 15 is concentrated in the front direction by the diffusion effect of the light diffusion film (lower diffusion film) 17, and becomes a non-derivative light after the output angle distribution has diffused light.稜鏡面入入. Then, the ruthenium substrate is refracted by the refractive index difference between the material constituting the 稜鏡 unit and the air through the ruthenium substrate, so that the diffused light of the exit angle distribution is biased toward the front side. Shoot out. It is assumed that the light-free diffusion film (lower diffusion film) 17 is only the refraction of the prism exit surface, and the light emitted from the light guide plate may not be sufficiently bent as shown in FIG. 3 toward the front direction, and the brightness near the light source side is not large. Since the brightness distribution in the front direction of the backlight is sufficiently increased and uniform, it is necessary to temporarily enlarge the angular distribution and to cause the light deflected in the front direction to enter the cymbal sheet, and the light diffusion film (lower diffusion film) 17 is necessary. On the other hand, in the case where the light diffusing film 17 is diffused into a wide angle at the front direction, the light collecting action of the cymbal sheet 18 is sufficiently exerted, and the 201022711 light emitted from the light guide plate is efficiently concentrated toward the front surface of the backlight. The cymbal sheet 18 is arranged such that two lamellae 18 are overlapped and the ruthenium array is substantially orthogonal. Two sheets of a light-diffusing film (lower diffusion film) and two enamel sheets are required, and at least three optical sheets are required. On the other hand, Fig. 4 shows the arrangement of the optical elements of the backlight unit in which the face of the prism is disposed toward the exit surface of the light guide plate. The light emitted from the upper surface of the light guide plate 25 enters the array through the air layer, and enters the inside of the corner from the inclined surface of the unit of the unit in the array 32, and then enters the light of the other slope at an incident angle larger than the critical angle. With this bevel, it is totally reflected, and the large square changes direction and concentrates toward the front of the backlight. Therefore, by designing the alignment of the characteristics of the direction of the light emitted from the light guide plate, the light diffusion film (lower diffusion film) can be used, and only one piece of the film can be used to achieve a high direction toward the front of the backlight. Uniform brightness distribution. Thus, by adopting the cymbal configuration as described above, there is an advantage that the number of parts can be reduced, the thickness of the backlight unit can be reduced, and the productivity can be improved. On the other hand, on the other hand, compared with the case of the conventional backlight unit using the lower diffusion film, it is easier to strongly observe the wavy stripes and to lower the image quality of the 显示 w display surface of the liquid crystal display device. In the past, in order to suppress the wavy stripe, a method of preventing streaks of an upper diffusing film using a further diffusion film on the exit side of the ruthenium of the cymbal is performed (see, for example, Patent Document 1 or Patent Document 2). However, when the above-mentioned diffusion film is applied to the backlight unit on the exit side of the light guide plate on the exit side of the light guide plate, even if the turbidity of the diffusion film is increased, the front surface brightness of the liquid crystal display surface is greatly sacrificed, the waveform stripe cannot be reduced. The possibility of reaching the level of practical use. In the method of Patent Document 1 in which the second diffusion plate having the embossed 201022711 rough surface is disposed between the cymbal sheet and the liquid crystal module, the backlight unit disposed on the exit side of the light guide plate is insufficient. The wave streaks are suppressed, and the thickness of the diffusing plate itself is not thinned, and the thickness of the entire backlight unit is greatly increased by the insertion of the diffusing plate, so that it does not meet the recent demand for thinning. In addition, in the method of Patent Document 2 in which a relatively turbid diffusion film containing a resin particle or the like as a diffusion material is disposed between the ruthenium sheet and the liquid crystal module, a commercially available diffusion film is used as it is, and it is necessary to suppress insufficient waveform streaks. In order to obtain a sufficient diffusion effect, it is necessary to use a diffusion film having a thick film thickness, and the front surface brightness of the liquid crystal display device is easily lowered, so that it is difficult to say that it is suitable for use in a high definition display of the recent film type liquid crystal display device. In the past, various types of backlight units having a configuration in which the ridge surface of the prism lens having the advantage of reducing the number of parts is used toward the exit surface of the light guide plate have been used. However, there is a problem in that the countermeasure against wave streaks is insufficient. For example, the backlight unit of the following structure may have several effects on suppressing the waveform stripe, but it is still insufficient. For example, as a means for obtaining brightness uniformity of the backlight, it is forbidden to use a non-faceted surface of the cymbal as a rough surface (for example, refer to Patent Document 3). In addition, a diffusing surface in which the light emitted from the light guide plate is incident on the surface of the cymbal sheet, and the uneven surface is disposed on the non-tank surface on the exit side or the diffusing particles are contained (see, for example, Patent Document 4). In addition, a light diffusion layer including a light-diffusing material on the exit surface and a light-diffusing layer on the light-emitting surface is provided (for example, Patent Document 5). However, in the case of the cymbal of the patent document 3 which has been subjected to the previous roughening processing only in the non-faceted manner, although the number of parts is reduced, the suppression of the waveform streaks is insufficient. Further, in the structure of Patent Document 4 in which the diffusion plate is inserted as the exit surface side of the non-稜鏡201022711 surface of the cymbal sheet, it is effective to remove the spot image formed on the reflector for the light guide plate, but for removing the wavy stripes Then did not beg. In consideration of the fact that the thickness of the diffusing plate is increased by the removal of the diffusing plate, the brightness of the liquid crystal display surface is likely to be lowered, which may hinder the overall thickness reduction of the liquid crystal display device. In addition, in the case of the cymbal of Patent Document 5 in which the previous light-diffusing layer is applied, the effect of enlarging the viewing angle is obtained, and the number of parts is reduced as in the case of the cymbal of Patent Document 1, but the number of parts is reduced. The effect of the wavy stripes is limited, and even if it can be suppressed, there is a possibility that the brightness of the liquid crystal display surface is lowered. As described above, in the enamel sheets described in Patent Document 3 to Patent Document 5, various light diffusion layers are formed on the exit surface side of the enamel sheets. However, the structure of such light-diffusing layers does not change the structure for roughening the surface, or the previously used light-diffusing material for obtaining the uniform uniform light diffusion, although the prism faces are used toward the light guide plate. The exit surface is more likely to produce a structure of wavy stripes, but it does not specifically invite new beeps to reduce the wavy stripes. In other words, in the enamel film described in the documents of Patent Document 3 to Patent Document 5, although the light collected from the exit surface of the cymbal sheet is again incident on the light diffusion layer, the brightness of the liquid crystal display surface is reduced, but on the other hand, ' It is not always possible to achieve a larger effect for reducing the waveform streaks. Further, the trend of the recent technology for further thinning the entire liquid crystal display device has not been carried out in accordance with the thin film. In short, the light-diffusing layers of such ruthenium sheets do not prevent the generation of wavy stripes as an original purpose, and their effects are limited. On the other hand, a light-diffusing film having a light-diffusing layer containing porous particles as diffusion particles having a higher diffusion efficiency than 201022711 is known (see Patent Document 6 or Patent Document 7). Patent Document 6 describes that the average primary particle diameter is 2. A light-diffusing film of a light-diffusing layer formed of spherical porous cerium oxide of 5 μχη or more and ΙΟμπι or less and a resin binder. Patent Document 7 describes a light-diffusing sheet in which porous transparent fine particles are dispersed in a transparent base material layer. However, these light-diffusing films or light-diffusing sheets have the purpose of improving the light-diffusing function by using porous particles, but the basic functions or forms of use are not different from those of the prior light-diffusing films or sheets. It is not a method of using a light stray stripe suppressing function which is inherent in the light-diffusing layer having a porous particle and which has not been previously obtained, and is not optimized for the purpose of suppressing the waveform fringe. Like other patent documents, these light-diffusing films or light-diffusing sheets have the same purpose of uniform light diffusion, and the effect of preventing the occurrence of wavy stripes is secondary, and the effect is also limited. The wavy stripes are produced between the light that undergoes periodic intensity changes with the optical material. Therefore, it is generally possible to suppress the strong light diffusion effect such that the periodic intensity change disappears. Therefore, by increasing the concentration of the diffusion particles in the light diffusion layer or by inserting the light diffusion film having a sufficiently thick film thickness of the light diffusion layer into the optical path, generation thereof can be suppressed. However, according to the method of improving only the previous light diffusion function, the light deflected toward the front direction by the cymbal sheet is deflected toward the peripheral portion, so that the amount of light in the front direction is insufficient, which easily causes the backlight unit or the liquid crystal display device. The reduction in frontal brightness. Further, there is a tendency that the light-diffusing film itself is thickened, and it is not possible to comply with the recent thinning of the backlight unit or the liquid crystal display device. There are various methods available for the method of performing light diffusion, and it is used in the most suitable method for the situation required for each light diffusion. However, the focus has not been focused on the waveform stripe, and the method has been discussed from the viewpoint of the method, and it is required to more effectively limit the adverse effect of reducing the front luminance to the minimum suppression method of the waveform stripe. [Patent Document 1] JP-A-6-102506 (Patent Document 3) Japanese Laid-Open Patent Publication No. Hei No. Hei. No. Hei. [Patent Document 5] Japanese Laid-Open Patent Publication No. JP-A No. 2004-348000 [Patent Document 7] JP-A-2004-348000 (Problem to be solved by the Invention) An object of the present invention is to provide a wavy stripe suppressing film which has a high effect of suppressing wavy stripes with a thin film thickness and can be maintained when a wavy stripe suppressing film for a backlight unit used in a liquid crystal display device is used. The high brightness of the backlight unit or the liquid crystal display surface contributes to the thinning of the previous backlight unit or the liquid crystal display element, and at the same time achieves high front luminance and effective suppression of waveform streaks. In particular, it is to provide a wavy stripe suppressing film which is applied to a backlight unit having a structure in which a ruthenium surface is disposed on an exit surface side of the light guide plate, and is applied to the exit side of the cymbal sheet to more effectively perform the backlight unit. Thin film and corrugated strips-11-. 201022711 Two sides of the pattern suppression. [Means for Solving the Problem] The inventors of the present invention have found that the porous particle is fine in the case of a wavy stripe suppressing film having a specific porous particle and a light-diffusing layer containing the porous particle as a diffusion particle. The pore volume is in a certain range, and the relationship between the volume average particle diameter of the porous particles and the film thickness of the light diffusion layer, and the content of the porous particles in the light diffusion layer are set to a specific range. Even if the film thickness of the light-diffusing layer is thin, the front side luminance is not greatly reduced, and the wavy stripe suppressing film of the wavy stripe can be effectively prevented, and the present invention is completed. In other words, the present invention provides a wavy stripe suppressing film which is disposed on the exit surface side of the ruthenium which is disposed on the exit surface of the light guide plate of the backlight unit toward the ruthenium surface, and is permeable to light. The surface of one side of the substrate has a light diffusion layer containing a resin binder and a porous particle, and the pore volume of the porous particle is 1. 00~2. 00 ml/g, ❹ The content of the porous particles is 30 parts by mass or less based on 100 parts by mass of the solid content of the resin binder. Furthermore, the present invention provides a prism sheet having a wave stripe suppressing function, which is characterized in that a light-transmitting substrate sandwiching the light-diffusing layer is formed, and prism shapes having mutually parallel edges on opposite sides are formed. . Furthermore, the present invention provides a backlight unit characterized by comprising the aforementioned wavy stripe suppressing film or a ruthenium sheet having a wavy stripe suppressing function. -12-201022711 Further, the present invention provides a backlight unit having a light source having at least one end surface side of a arranging plate and a light guide plate, and a cymbal having a side surface disposed on the side of the outgoing surface on the side of the outgoing surface The exit surface side of the prism sheet has the aforementioned wave stripe suppression film. Furthermore, the present invention provides a backlight unit having a light source having at least one end surface side of a layout plate and a light guide plate, and a front waveform having a side surface disposed on an exit surface side of the light guide plate on the light guide surface side. Bracts of the stripe suppression function. Furthermore, the present invention provides a liquid crystal display device comprising the wavy stripe suppressing film or the backlight unit with the wavy stripe suppressing function sheet. The light-diffusion layer of the wavy stripe suppressing film of the present invention contains a plurality of fine pores in the light-diffusing layer, and the pores contain a binder resin and light that enters the light-diffusing layer passes through the pores and holds the fine particles. And the most common reflection and refraction between the adhesive resin and the air in the pores. As a result, compared with the usual resin particles, the porous diffusion particles and the light diffusion layer having a relatively small film thickness are also diffused. Therefore, the incident light of the wavy stripe suppression film can be scattered to suppress the generation of the wavy stripes, and the transmission loss of the cymbal can be reduced, and the total light transmittance can be maintained at a high 値, so that the front luminance of the liquid crystal display surface can be high. The reason for suppressing the occurrence of the above-described effects of the waveform streaks is not necessarily clear, but basically these particles have a finer number of protrusions on the surface of the porous particles than the particle diameter, and these are generally ridge line pitches or liquid crystal elements. The pixel is attached to the light guide plate, and the porous air having the front side is attached to the light guide plate, and the adhesion of the hole is relatively small, and the illuminance is maintained in a good condition. The concave spacing of the porous grade is more small -13- 201022711. Therefore, it is considered that the reflection or refraction of the fine structure through the surface of such a porous particle can more effectively disturb the light path of the light passing through the regular structure of the crucible or the liquid crystal pixel or the like, even if it is a small porous particle. The amount of addition is such that the amount of addition of the wave streaks can be effectively suppressed with a very small addition amount as compared with the light-diffusing particles which do not have such fine unevenness on the surface. In the case of the resin particles used in the usual light-diffusing layer, since the difference in refractive index between the resin particles and the binder resin is small, the light diffusion which is largely deflected by the incident light is applied to the surface of the light-diffusing layer mainly composed of resin particles. The concave ® convex is carried out. However, in the case where porous particles are used as the diffusion particles, as described above, light diffusion in the interface of the porous particles containing the binder and air or in the porous particles containing air contributes to the suppression of the wavy stripes. Further, the wavy stripe suppressing film of the present invention has a streak suppressing film containing a light-diffusing layer of a resin binder and porous particles on one side of the light-transmitting substrate, and the pore volume of the porous particles is 1. 00~ 2. 0 0 m 1 / g 〇 Applicants have found that by using porous particles as diffusion particles in the light diffusion layer, the suppression of the waveform fringes can be effectively performed, but it is found that the pore volume of the porous particles used is further For a specific range, it is possible to suppress the waveform fringes more effectively with a thin film thickness of the light diffusion layer without lowering the front luminance. That is, the pore volume of the porous particles of the light-diffusing layer of the present invention is 1. 00 ~ 2. 00ml / g. The pore volume of the film is suppressed by the wavy stripe of the present invention to be 1. Above 00 ml/g, the incident light is not only on the surface of the diffusion particle, but also has a high probability of being irregularly diffused at the interface with the pores in the particle to be extremely high -14 - 201022711. Therefore, even if the content of the porous particles in the light diffusion layer is kept low, an equivalent wave streak suppressing effect can be obtained. By setting the pore volume as described above, the content of the porous particles can be kept low, so that the pot life due to the coating of the porous particles is prevented from being lowered, or because of such The resin component of the coating film formed by the coating material is relatively reduced, and the bonding strength to the substrate is lowered. On the other hand, as the pore volume of the porous particles becomes larger than 2, the front surface brightness is liable to lower. This is considered to be because if the pore volume becomes large, v forms a large number of pores which are extremely complicated and staggered in the particles. Therefore, when this is added as a diffusion particle to the light diffusion layer, a binder cannot be formed. Many of the pores of the resin have a large angle of refraction at the interface of the pores, and the amount of light toward the front direction is relatively reduced. For the same reason, the pore volume is 1. 8 is preferably as follows. 6 or less is better. Further, although it is not necessarily clear, it is considered that total reflection is likely to occur at the interface of the pores which are not filled with the binder resin, so that it is difficult to emit incident light. Further, when the pore volume is increased, the amount of the binder resin for filling the pore volume is also increased, so that the total amount of the binder resin in the porous particles is also increased. Therefore, the porous particles will have a property similar to that of the binder resin, and it is considered that the agglomeration of the porous particles with each other is easily caused. Therefore, the coating for forming a light-diffusing layer tends to be sticky, and tends to be easily gelatinized. For the above reasons, when a light-diffusing layer is formed using a coating material for a light-diffusing layer containing a porous particle having a pore volume in the above range, the front luminance is not greatly lowered, and a thin light diffusion layer can be effectively used. Suppresses waveform streaks. Furthermore, -15-201022711 will not produce tack or gelation of the coating itself. In addition, the amount of the wavy stripe-reducing film-based porous particles of the present invention is in the range of 30 or less based on 100 parts by mass of the solid content of the resin binder. In the present invention, it is found that the amount of the porous particles in the light-diffusing layer is 30 parts by mass or less based on 100 parts by mass of the solid of the resin binder, and is not on the surface of the light-diffusing layer. If the optical path of the emitted light does not greatly deviate from the front direction, the ratio of the adhesive component in the light diffusion layer does not decrease, so the contact does not decrease. That is, the wavy stripe suppressing film of the present invention has a porous plasmid light-diffusing layer, so that light diffusion efficiency is high. Therefore, even if it is a thinner and less added amount, the incident light is effectively scattered, and the suppression of the waveform strip exhibits a high function. Further, the pore volume of the porous particles is 〜2. 0 0ml / g. Therefore, even if the amount of the porous particles in the light-diffusing layer is suppressed to be low, an equivalent wave streak suppressing effect can be obtained. Further, the content of the porous particles in the light-diffusing layer is a solid content of the resin binder. When 100 parts by mass or less is 30 parts by mass or less, a large unevenness is not formed on the surface of the light-diffusing layer, and the irregular reflection is made lower, and the joint strength is not lowered. [Effects of the Invention] The wavy stripe suppressing film of the present invention has a light-diffusing layer containing porous particles on one side of the light-transmitting substrate, and the pores of the porous particles are 1. 00~2. In the range of 00 ml/g, it can be produced in a small amount of content containing components. Reinforce the film thickness of the hadron 1. 含 含 〇 所以 所以 - - - -16 - 201022711 Effective light diffusion, and the amount of light emitted in the front direction can be ensured, and the front side brightness can be greatly reduced, and the waveform stripe can be effectively suppressed. In addition, the content of the porous particles is 30 parts by mass or less based on 100 parts by mass of the solid content of the resin binder, so that large unevenness does not occur on the surface of the light diffusion layer, and the light path of the emitted light does not largely leave the front surface. Since the direction is lowered, the front side luminance can be reduced, and the waveform fringes can be more effectively suppressed by the thin film thickness of the light diffusion layer. The wavy stripe suppressing film of the present invention has a light source disposed on at least one end surface side of the light guide plate and the light guide plate, and an edge disposed on the exit side of the light guide plate at an exit surface side of the light guide plate In the structure of the backlight unit which is easily generated by the wavy stripe of the cymbal, as shown in FIG. 5, when disposed on the exit surface side of the cymbal, the front surface luminance of the backlight unit is not greatly reduced, and the waveform is extremely effectively suppressed. stripe. Further, since the thickness of the film itself is thin, it does not hinder the thinning of the entire backlight unit which is a feature of the backlight unit. The bismuth sheet having the light diffusing function of the present invention has a 稜鏡 shape having parallel ribs interposed therebetween, so that the enamel surface is disposed toward the exit side of the light guide plate. The light incident from the pupil surface is effectively scattered by the light diffusion layer on the opposite side, and the amount of light toward the front direction is not greatly reduced, and the waveform fringes generated between the pupil surface and the liquid crystal cell can be effectively prevented. Further, not only the function of integrating the ruthenium sheet and the wavy stripe suppressing film but also the effect of reducing the number of parts of the entire backlight unit is achieved. Furthermore, the use of these wavy stripe suppression films or with wavy stripe suppression -17- . The backlight unit of the function of the 201022711 can provide a light source that maintains a high front luminance, which can suppress the reduction and can effectively suppress the waveform stripe. At the same time, by using these, the film thickness of the entire unit can be suppressed to be thin. Further, a liquid crystal display device having such a backlight unit on the back surface of the liquid crystal display surface can provide a liquid crystal display device which maintains a front luminance of the display surface and prevents wavy stripes from being formed on the display surface. Further, as described above, since the thickness of the entire backlight unit can be suppressed to be small, it is also possible to contribute to the reduction in thickness of the liquid crystal display device itself. [Embodiment] [Best Mode for Carrying Out the Invention] Hereinafter, various wavy stripe suppressing films including the best mode and a ruthenium sheet with a wavy stripe suppressing function, a backlight unit, and a liquid crystal display device for carrying out the present invention are used. Each part is explained. First, the light diffusion layer of the wavy stripe suppressing film of the present invention contains porous particles as a light diffusing material, and the pore volume of the porous particles is 1. 00~2. In the range of 00 ml/g, even if the film thickness of the light-diffusing layer is thin, 〇 does not greatly reduce the front luminance, and the wavy streaks can be effectively suppressed. If the pore volume of the porous particles is less than l. In order to effectively suppress the waveform streaks, ooml/g must increase the concentration of the diffusion particles in the light diffusion layer. In this case, there is a problem that the bonding strength between the diffusion layer and the substrate is lowered, or the pot life of the coating is lowered. On the other hand, if the pore volume of the porous particles is larger than 2. At 00 ml/g, the total amount of the binder resin in the pores of the porous particles in the coating material increases, and aggregation between the porous particles tends to occur, resulting in a problem that the pot life is lowered. Further, the pores of the porous particles -18-201022711 have a large volume, and more pore portions in the porous particles are not filled by the binder resin, and remain as pores. Therefore, the incident light is refracted between the pore walls and the pores having a large difference in refractive index, and is more likely to be emitted away from the front surface, so that the front luminance may be lowered. Further, the light which is incident on the hole portion which is not filled with the binder resin is easily totally reflected by the hole wall, so that it is easy to reduce the emitted light, which may be one of the causes. As described above, the wavy stripe having a large pore volume suppresses the light diffusing ability of the film to be high, so that the front luminance is liable to be lowered for various reasons, but the scattered light of the incident light tends to increase, so that the viewing angle can be effectively suppressed. The advantages of wavy stripes in large directions. Therefore, when a light diffusing film is used as a general light diffusing film, a light diffusing film having a smaller content of porous particles and a thinner film thickness of the light diffusing layer can be used to obtain an equivalent light diffusing effect. Further, the pore volume of the porous particles can be measured by a mercury intrusion method (porosity method), and can be obtained by measuring a pore distribution by a mercury porosimeter (for example, the automatic pore size IV95 series of Shimadzu Corporation). The porous V particles used in the light-diffusing layer of the wavy stripe suppressing film of the present invention are preferably amorphous porous particles having a polygonal shape having irregular angles and side lengths in order to more effectively disturb the passage. The optical path of the light arranged in the array or liquid crystal pixels. Since the spherical shape has a lower light diffusing function than the amorphous one, it is preferable to suppress the wavy streaks so as to contain more particles, and the front luminance tends to be lowered. Further, the spherical porous particles tend to form hemispherical irregularities on the surface of the light-diffusing layer, and these irregularities tend to scatter light rays which are deflected in the front direction toward the peripheral direction. In the arrangement of the second and third figures in which the light diffusing film is disposed on the exit surface of the light guide plate from the non-faced side of the 稜鏡-19-201022711, the light diffusing film and the cymbal are used for incidence. Since the light having a large angle is deflected toward the front direction, the large deflection of the light using the light-diffusing film increases the front luminance. However, in the arrangement of the fourth and fifth figures in which the pupil surface of the cymbal sheet faces the exit of the light guide plate, the light emitted from the light guide plate is deflected toward the front direction by the cymbal sheet, so that the cymbal sheet is deflected. After the exit, if an optical element having a strong deflecting effect exists, the light is deflected toward the peripheral direction, and the front luminance is easily lowered. As the structure of the porous particles, it is preferred that the primary particles agglomerate to form amorphous aggregated particles having a volume average particle diameter of 1 to ΙΟμηη. Volume average particle size 2 ~ 8 μ m is better, 2. 5 to 6 μ m is optimal. In particular, when the thickness is less than 3 · 5 μ m, the volume average particle diameter is small, and it is difficult to form irregularities on the surface of the light diffusion layer due to the porous particles. Regarding the reduction in frontal brightness, further, if the volume average particle diameter is 2 to 3.  The range of 1 μηι can be suppressed to a minimum. Further, as the primary particles, a particle diameter of 10 to l 〇〇 nm is preferred. If it has the range of the pore volume specified in the present invention, even a spherical porous particle can be used, and the spherical one is indefinite. In the shape, the light diffusion function is low, so that the wave streaks are well suppressed, so that it can contain more particles, and the front brightness is easily lowered. In addition, in order to more effectively generate irregular reflection and refraction, the particle size distribution is larger. Organic fine particles and inorganic fine particles can be used. Among them, inorganic materials such as porous ceria, porous alumina, porous titanium oxide, and porous glass can easily obtain a refractive index difference from the binder resin and easily increase the particle surface. The reflectance is preferred so that it is effective to obtain diffusely reflected light. Further, it is also preferable in that it is easy to increase the surface hardness of the light diffusion -20-201022711. Among them, particles of porous cerium oxide are particularly preferred. Further, in order to measure the particle diameter of the porous particles, a laser diffraction type particle size distribution measuring device such as a laser diffraction type particle size distribution measuring device SALD_200 (manufactured by Shimadzu Corporation) can be used. In the light-diffusing layer of the wavy stripe suppressing film of the present invention, since the diffusion efficiency of the porous particles is good, the film thickness can be made thinner than before, and the wavy stripe suppressing film can be made thin. To suppress the wave streaks and ensure a high front brightness, and to achieve thinning of the light diffusion layer, the light diffusion layer thickness can be 8 μm or less, and a light diffusion layer having a film thickness thinner than the previous one can be realized, and the wave stripe suppression film can be used. Greatly thinned. When the film thickness is 6 μm or less, it is more preferable at the point of film formation. However, when the film thickness is less than 2 μm, the efficiency of light diffusion is likely to be lowered even if the particle diameter or the content of the diffusion particles is adjusted. Therefore, in consideration of the film formation, the film thickness in the range of 2 to 6 μm is also preferable. In the region where the thickness of the diffusion layer is extremely thin, the porous particles protrude from the surface of the resin binder of the light-diffusing layer, and the diffused light is easily deflected by a large φ in the front direction. Therefore, it is necessary to suppress the waveform streaks more effectively, while maintaining the front luminance at a high level, and suppressing the film thickness of the entire stripe suppression film, and suppressing the diffusion layer thickness to the volume average particle diameter of the porous particles. 3 ~ 2. A 1x range is preferred. t/d is less than 1. At 3 o'clock, the porous particles easily protrude from the surface of the resin binder of the light-diffusing layer. Therefore, extremely thick irregularities are formed on the surface of the light-diffusing layer, and the light emitted from the light-diffusing layer is easily deflected from the front direction toward a direction having a large angle. Further, the surface of the fine concavities and convexities rich in the porous particles appears on the outermost layer, so that the regular reflection at the time of emission is not significant, and the tendency of the front luminance is lowered. The larger the volume average particle size of the porous particles, the more significant the volume is less than 3. In the case of 5 μm, the unevenness formed on the surface of the light-diffusing layer becomes relatively remarkable when it exceeds 6 μm. Therefore, in order to more effectively form streaks and maintain a high degree of frontal brightness, it is preferable that each of the porous layers is buried in the binder resin of the light diffusion layer. t/d is greater than 1. At 3 o'clock, the light-diffusing particles are sufficiently embedded in the binder resin. If there is a resin layer of sufficient thickness to bury the porous, the porous particles are less diffused from the light. The surface of the concavities and convexities rich in porous particles is directly exposed to the space, and the surface of many porous particles is in contact with the binder resin below the surface of the lipid layer. Therefore, the emitted light from the light-diffusing layer is subjected to extremely large irregular reflection, and the front luminance is less reduced. In addition, if t/d exceeds 2. 1. The film thickness of the light-diffusing layer is too thick, and the present invention conforms to the invention of the present invention. The diffusing particles having different particle diameters are likely to overlap each other, and the unevenness is likely to occur again on the surface of the light-diffusing layer. When the light diffusion thickness is thicker, the brightness of the porous particle surface is sufficiently buried in the binder resin, but the film thickness of the light diffusion layer is increased, and the film thickness of the wave stripe suppression film is further reduced. The tendency of the invention of the present invention is also that the larger the volume average particle diameter of the porous particles, the more the volume average particle diameter is less than 3. 5μιη, more preferably 2~3. The reduction in frontal brightness caused by the unevenness formed by 1μιη is small, and is not a problem, but exceeds 3. When 5μιη, t/d is 2. 1 is preferred below. When the specific average particle diameter exceeds 6 μm, the unevenness formed is more remarkable. Therefore, when the average particle diameter is small, the particles are suppressed, and the particles of the plasmid can be protruded from the gas, and the particles are less likely to be in the surface. The film of the thick layer is not added. With. For the time being, the big question is that the volume t/d is -22-201022711 2 · 1 or less. The ratio t/d of the volume average particle diameter (d) of the porous particles to the film thickness (t) of the light diffusion layer is 1. 3~2. In the range of 1, there is a resin layer of sufficient thickness to bury the porous particles, so that the porous particles protrude less from the light-diffusing layer and there is no thickness in which only a plurality of particles overlap each other in the light-diffusing layer, and the probability is small. Therefore, the surface of the uneven surface rich in the porous particles is directly exposed to the air, and the surface of many porous particles is buried in the binder resin, and the surface of the light diffusion layer is also smoother. Therefore, the emitted light from the light diffusing layer does not undergo extremely irregular reflection on the surface, and the front luminance is less reduced. Here, the thickness of the light-diffusing layer is measured by the height of the sheet-like substrate from the surface of the resin binder holding the light-diffusing material, instead of measuring the height from the apex of the protruding light-diffusing material. When the porous particles are protruded, the height deviation of the apex of the porous particles is extremely large, and does not necessarily indicate the actual state of the film thickness of the light-diffusing layer. On the other hand, the thickness of the adhesive resin layer is uniformized by the coating of the light-diffusing layer. Level ling) becomes certain. When the thickness is measured by a point contact type film thickness meter, the measurement is performed at a minimum of 10 points or more, and the average value of 3 points is obtained from the lowest one. Or, taking a SEM photograph of a cross section of the light-diffusing layer, measuring the film thickness at three points, and taking the average 値, it is also possible to obtain the above, and in particular, the height of the streak-reducing effect and the height of the front-side luminance are increased. Then the other party reduces the choice of one (trade - 〇 ff) relationship. The size of the wave streak suppressing effect is related to the magnitude of the light diffusing effect, that is, haze ,, but generally, the arrangement of the backlight unit of the prior structure in which the non-faceted surface and the light guide plate are exposed through the light diffusing film -23- 201022711 The surface of the light diffusing film with high turbidity acts to deflect the outgoing light from the light guide plate toward the front direction. Therefore, for example, the turbidity and front brightness of the light diffusing film are not particularly related to the selection of one, but instead It lies in the relationship. On the other hand, the front luminance and the turbidity are characterized in that the relationship between the front luminance and the turbidity is selected in the wavy strip suppressing film of the present invention disposed on the exit surface side of the prism sheet disposed on the exit surface of the light guide plate toward the pupil surface. Therefore, various adjustments are made to sufficiently suppress the waveform streaks, and it is practically important not to reduce the front luminance as much as possible. Among the parameters for adjusting these, as described above, ® has a ratio of the content of the porous particles, the volume average particle diameter (d) of the porous particles, and the film thickness (t) of the light diffusion layer (t/d) In the selection of the porous particles themselves, it is important to select a pore volume to be used within the scope of the present invention. After the selection of the porous particles, it is important to adjust them within the range specified in the present invention, so that a good streak suppressing effect coexists with a high frontal brightness. It is important that the light-diffusing layer diffuses the portion of the incident light as much as possible while transmitting it toward the side opposite to the incident direction. Therefore, the turbidity of the portion of the light-diffusing layer of the present invention depends on the waveform stabilizing effect and the front luminance to be achieved, but 50% or more is preferable, more than 55% or more, and more preferably 60% or more. Further, the total light transmittance is preferably 85% or more, more preferably 90% or more. In the aspect of the invention, the porous particles in the light-diffusing layer effectively scatter the incident light, so that the incident light is converted into diffused transmitted light in the opposite direction to the incident light, and the waveform fringe can be effectively suppressed. The production. Since the wavy stripe suppressing film of the present invention contains porous particles, the light which has not been used for the porous particles is used in groups compared to the -24-201022711 ruthenium which is disposed on the exit surface side of the light guide plate toward the edge of the ruthenium. The diffusing film achieves a wave streak suppressing effect equal to or higher than that of the prior art by a smaller amount of light diffusing particles. Therefore, when the comparison is made with the equivalent wave streak suppressing effect achieved, the amount of the light-diffusing particles contained in the case where the conventional light-diffusing film is often used is small, and as a result, the unevenness generated on the surface of the light-diffusing layer is caused. The emitted light is less biased toward the peripheral direction, and a higher front luminance can be achieved. When the wavy stripe suppression film is used, the wavy stripes are effectively suppressed while maintaining the brightness of the liquid crystal display surface, and the content of the porous particles in the light diffusion layer® is 100% by mass relative to the solid content of the resin binder. It is preferably 60% by mass, more preferably 5 to 40% by mass, and most preferably 8 to 30% by mass. When the content of the porous particles is 2% by mass or more, the excellent light diffusing effect can be effectively utilized. When the content is 60% by mass or less, since the resin binder is sufficiently contained in the light-diffusing layer, a light-diffusing layer having good adhesion to the light-transmitting substrate can be formed. Further, many porous particles are present as a result of light. The unevenness on the surface of the diffusion layer is remarkable, the probability that the emitted light is largely deflected is increased, and the front luminance is not lowered. In addition to the porous particles described above, the light-diffusing layer may contain inorganic particles, organic particles or inorganic-organic mixed material particles as needed. For example, a white pigment such as titanium oxide or zinc oxide, or a filler such as calcium carbonate or talc may be contained in a range that does not inhibit various characteristics of the light-diffusing layer. It may also contain organic particles such as acrylic particles or acrylic urethane particles. Further, a layer containing the particles may be laminated on the other light-diffusing layer. In the light diffusion layer, if necessary, it may contain a hardener, a hardening agent, a dispersant, a plasticizer, a charge inhibitor, an ultraviolet absorber, a deterioration preventive agent, etc., which is equivalent to forming a light diffusion layer. The paint is prepared during the production. However, the optimum transmitted light is not attenuated by the presence of an absorbed substance in the visible light region, and it is preferable that the light diffusing layer does not contain an absorbed substance in the visible light region. The light-diffusing layer can be formed by applying a coating material for a light-diffusing layer containing the porous resin or the like to a binder resin and a solvent onto a substrate, followed by drying, but the substrate and the light-diffusing layer can be integrated. For example, by using a porous resin-dispersed binder resin, a base sheet can be produced by a usual sheet production method such as an extrusion method, and the entire film can be made into a light-diffusion layer, and the thickness of the entire wavy stripe film can be reduced. However, when the content of the porous particles is large, the mechanical properties of the sheet itself become fragile. To ensure the strength, the waveform stripe suppression function and the support function of the stripe suppression film are optimally separated, and a transparent substrate is used. The transparent film serves as a support for the light diffusion layer. The binder resin may be obtained by uniformly dispersing the porous particles in a resin and forming the sheet, or adding a solvent to prepare a coating material, and applying the coating to a light-transmitting substrate to laminate the coating film. It is not particularly limited, and a general molding resin, a coating resin, or the like can be used. For example, an acrylic resin, a vinyl chloride resin, a polyester resin, a polyurethane resin, a styrene resin, a polycarbonate resin, a cycloolefin resin, or the like can be given. The solvent of the coating material for a light-diffusion layer when the light-diffusion layer is formed by coating can be considered in terms of solubility of a binder resin, dispersibility of porous particles, and the like, thickness of a diffusion layer formed, drying property of a coating film, etc. , usually by using -26-

201022711 is suitably selected and used in the well-known solvent of the coating. The support base used as the wavy stripe-suppressing film of the present invention is not particularly limited as long as it has sufficient physical strength as a support, but is preferably a transparent substrate. In terms of or mechanical strength, it can be selected from polyethylene terephthalate! Film, polyethylene naphthalate (PEN) film, acrylic film, polycarbonate, cycloolefin, acrylic or other transparent or semi-transparent film. Among them, PET film or PEN film is particularly preferred. The thickness of the substrate is preferably from 5 to 250 μm, and more preferably from 10 to 2. When it is thinner than 5 μm, it is not only difficult to handle, but also curls due to heat shrinkage, and workability is remarkably lowered, which tends to decrease. When the thickness is thicker than 250 μm, the wavy stripe suppressing film cannot be used for a thin electronic device or the like, and the overshoot of the substrate itself is liable to be lowered, and the front luminance of the backlight unit is lowered to make the full thickness of the wavy stripe film thin and backlit. In particular, when the thickness of the liquid crystal display device for mobile phones is thin, it is preferably 7 to 50 μm. In order to improve the compatibility, at least one of the surfaces of the substrate surface is coated with an easy-bonding treatment layer, or a corona treatment or the like. As a wavy stripe-preventing film of the present invention, a coating material for a light-diffusing layer and a light-diffusing layer were applied to one side of the sheet-like substrate. The coating material for a light-diffusion layer is a film of a porous porous f-bond, a solvent, a charge-preventing agent, and other translucent properties as required, and a light-transparent surface smoothing ester (PET) thin film, polypropylene resin A film or a mechanical strength surface of the range of 100 μm will cause a tendency to transmit visible light due to the low thickness of i which is low in workability. The thin part of the special unit: for the purpose of modeling: the dense layer of the diffuser is provided with corona 丨, for example, it is formed by the addition of particles _ - 201022711. The coating method can be carried out by a general coating method. For example, blade, scraper, casting, impregnation, permeator, wire mesh, spin, reverse roll, jet, concave roll, spray, curtain flow, extrusion, fountain, roller, suspension, squeeze, positive Various coating methods such as roller and roll coating. The drying of the coating film can be carried out by a general drying method, for example, a hot air such as infrared rays, microwaves, electric induction heating, ultraviolet curing, or electron radiation curing. After drying, if necessary, heat-hardening at a predetermined temperature and time. The thickness of the wavy stripe suppressing film thus produced is 20 to 300 μm, but 20 to ΙΟΟμηι is at a point where the backlight unit can be made thinner. Preferably. In particular, when the backlight unit of a liquid crystal display device for mobile phones, which is required to be thinner, is required to have a full thickness of less than 1 ΟΟμιη, more preferably 20 to 70 μm, the display unit and the mobile phone can be made thinner. It is better. The wavy stripe suppressing film produced as described above can be used as a wavy strip suppressing film of a backlight unit using a cymbal sheet, in addition to being disposed on the exit surface side of the ruthenium sheet disposed on the exit surface of the light guide plate toward the ruthenium surface. The structure of the backlight unit is used by inserting the position from the exit surface of the light guide plate to the incident surface of the liquid crystal display surface at the most effective position, and the number of structural parts is small, so that the thickness of the entire backlight unit can be reduced. It is preferable that the backlight unit of the following structure, which is easy to generate wavy stripes, can exhibit its performance most effectively. In other words, the wavy stripe suppressing film of the present invention is disposed and fixed to a light source having at least one end surface side disposed on the light guide plate and the light guide plate, and an edge of the light guide plate disposed on the light guide plate of -28-201022711. It is preferable to use a side of the exit surface side of the cymbal of the backlight unit of the cymbal on the side of the exit surface side of the light guide plate. Further, the liquid crystal display device of the present invention can be produced by arranging and fixing the exit surface of the backlight unit thus produced in a conventional manner on the back surface side of the liquid crystal display surface. Regarding the direction in which the wavy stripe suppressing film is inserted, there is no problem in particular, but the light-transmitting substrate is the incident side, and the light-diffusing layer is the exit side, and there is a possibility that various functions are given to the incident side. Sex is better. On the surface opposite to the light-diffusing layer sandwiching the light-transmitting substrate, the position of the backlight unit of the film is suppressed in accordance with the arrangement of the streaks, and the sticking prevention function, the charging prevention function, the injury prevention function, and the like are provided. Various functional layers of various functions are also available. In addition, it can be used to further form another layer having a light diffusing function, thereby enhancing the light diffusion effect and increasing the overall turbidity. For example, on the side opposite to the exit side of the light guide plate, a reflective layer for enclosing light in the light guide plate is generally formed, and the outgoing light from the light guide w-plate is oriented in the same direction away from the light source to form an orientation. A continuous or discontinuous reflection pattern such as a direction in which the light source is increased in a direction away from the light source, but such a pattern may be used to increase the turbidity of the backlight unit in order to prevent the luminance discontinuity of the backlight unit from being increased. The light diffusing layer is adjusted to replace the use of a new light diffusing film. The light-transmitting substrate sandwiching the light-diffusing layer may be formed on the opposite side as a ruthenium sheet having a function of suppressing the wavy stripes. The ruthenium sheet with the wavy stripe suppressing function of the present invention forms the light-transmitting substrate of the light-diffusing layer sandwiching the wavy stripe suppressing film of the present invention of -29-201022711, and has mutually parallel edges on opposite sides.稜鏡 shape. The structure of the slab having the wavy stripe suppression function may be a transparent substrate or a transparent film, and a three-layer structure in which a matrix and a light diffusion layer are separately formed on both sides thereof may have a rib. Any of the layers of the mirror array or the light diffusing layer is integrated with the light transmissive substrate. In other words, the layer having the matrix or the light-diffusing layer itself may be a light-transmitting substrate of the support, and a layer of the other layer may be laminated on the other surface. Alternatively, it may be a layer in which a layer having a matrix and a light diffusion layer are directly laminated. However, it is preferable to use a light-transmissive substrate such as a separate transparent substrate or a transparent film to form a matrix and a light-diffusing layer by a coating step, and the composition, shape, and the like of each layer are also easily controlled independently. In other words, the prism sheet having the wavy stripe suppressing function of the present invention preferably includes a light-transmitting substrate, a light-diffusing layer formed on one surface of the light-transmitting substrate, and a light-diffusion layer interposed therebetween. The light-transmitting substrate is formed on the opposite side of the ruthenium layer. The stomach has a layer of the enamel of the enamel having the wavy stripe suppressing function of the present invention, and preferably has 稜鏡 arranged with a apex angle and a triangular shape in cross section, and has ridges formed in parallel and equally spaced edges. Column. Preferably, the surface of the array is a linear unit of the isosceles triangle of the same profile, and is arranged in parallel without gaps. The apex angle of the isosceles triangle of the profile is preferably 50° to 80°. More preferably 60°~70°. By forming an isosceles triangle having the same shape as the cross section, the manufacture of the raft is easy, and the enamel sheet can be made thinner, and the 稜鏡 function can be surely exerted. When the apex angle of 稜鏡 is 50° or more and 80° -30-201022711 or less, the edge of the ridge of the cymbal of the present invention is disposed toward the exit surface side of the light guide plate, and the ridge array is used. The total reflection of the bevel allows for a higher concentration of light toward the front of the LCD. In addition, the interval between adjacent rows and columns may be appropriately determined in consideration of the degree of film formation of the thickness of the matrix portion, the ease of manufacture of the matrix, the ease of generation of the wave stripes, and the like, and is preferably 5 to ΙΟΟμηη, 10 ~50μιη is better. The height of the prism array also affects the interval between the prism rows. However, when the thickness of the wafer is reduced, the thickness of the backlight unit is reduced, and in particular, the thickness of the liquid crystal display device for a mobile phone is reduced. 50 μm is preferred. The formation of the ruthenium with the wavy stripe suppression function of the present invention can be formed integrally with the support, or can be formed by laminating on the support. Regarding these, a well-known formation method can be used. An example of the manufacturing method of such a cymbal will be described below. For example, as disclosed in Japanese Laid-Open Patent Publication No. Hei 11-17 1941, it is possible to apply a continuous substrate to a die roll by a pressing roll, and supply a liquid ultraviolet curing type to a contact portion between the pressed substrate and the die roll. A method in which a resin is fixed in a shape by irradiation with ultraviolet rays and peeled off from a mold roll. Alternatively, as disclosed in Japanese Laid-Open Patent Publication No. 2002-258410, a liquid ultraviolet curable resin may be adhered to a mold roll, and then contacted with a continuous substrate to irradiate ultraviolet rays to fix a shape and peel off from the mold roll. . Alternatively, a method in which the ultraviolet curable resin is applied to a transparent substrate by a known coating method, and the ultraviolet curable resin surface is pressed against the die roll in an uncured state, and then irradiated with ultraviolet rays to fix the shape and peeled off from the die roll. -31-201022711 For example, according to the above-described formation method, as a material for the tantalum sheet of the present invention having a wavy stripe suppressing function, it is transparent, has initial fluidity, and is cured by light curing such as ultraviolet rays. The material to be used, which is softened by heating to become fluid, and which is cooled and re-solidified, can be used without particular limitation. For example, an ultraviolet curable resin composition, a thermoplastic resin or the like can be used. As the ultraviolet curable resin composition, various ultraviolet curable oligomer monomers such as an unsaturated polyester type, an acrylic type, a vinyl ether type, a maleimide type, and an epoxy resin type can be used as a main component. A reactive diluent, a polymerization initiator, a polymerization accelerator, an organic solvent, or the like is mixed as needed. As the thermoplastic resin, a general-purpose thermoplastic resin which is fluidized by heating, such as polyethylene, polypropylene, polystyrene, acrylic, polyester, or polycarbonate, can be used. Among them, a UV curable resin composition is particularly preferred. The reason is that when the thermoplastic resin is heated to a temperature higher than the glass transition temperature of the substrate, the substrate is deformed by heat, there is a possibility of occurrence of defects, and the ultraviolet curable resin composition is used as compared with the use of the thermoplastic resin. In the case of the heating and cooling time in each section, the production efficiency is advantageous. As a method of producing the prism sheet of the present invention, for example, a light diffusion layer having a wave stripe suppressing function can be formed on one surface of a light-transmitting substrate, and the above-mentioned surface can be formed on the other surface. Further, for example, the sheet having the above-described array on one surface may be formed by the above method, and then a light diffusion layer may be formed on the side opposite to the surface of the sheet. The sheet having the array may be formed on the substrate from 32 to 201022711, or may be formed by integrating with the substrate, for example, a sheet having a substrate, which is different from the surface of the matrix formed on the substrate. On the surface, the coating material for a light diffusion layer is applied by the coating method described above and the drying method described, and then dried to form a light diffusion layer. The full thickness of the ruthenium sheet having the wavy stripe suppressing function thus produced is 20 to 300 μm, but 20 to ΙΟΟμηι is preferable in that the backlight unit can be made thinner. In particular, in the case of a backlight unit for a liquid crystal display device for a mobile phone which is required to be thin, it is possible to have a full thickness of less than iOOl·1111', preferably 20 to 70 μm, so that it can be used for the display unit' Thinning has contributed significantly. The backlight unit for a liquid crystal display device is produced using the slab having the wavy stripe suppression function as described above, and the ruthenium surface is adjacent to the exit surface of the light guide plate having the light source, and the ruthenium surface faces the exit surface side of the light guide plate by a known method. The slab with the waveform stripe suppression function of the present invention can be configured and fixed. In this case, the total thickness of the backlight unit can be greatly reduced as compared with the previous four structures using the lower diffusion film, the upper diffusion film, and the two sheets. Further, a liquid crystal display device of the present invention can be produced by a liquid crystal display device which is formed on the back side of the liquid crystal display surface and has a structure in which the exit surface of the backlight unit thus produced is disposed and fixed by a conventional method. [Examples] Hereinafter, the preparation procedure of the coating material for a diffusion layer (a) of the present invention will be described with reference to the examples. 270 parts by mass of 74 parts by mass of toluene cyclohexanone-33-201022711 Unshaped porous cerium oxide Sylysia 420" 35 parts by mass [average pore diameter: 17 nm, pore volume: 1.25 ml/g, volume average particle diameter (according to laser method): 3.1 μιη, Fuji Silisia Chemical Co., Ltd. Acrylic resin solution "ACRYDIC WDU-938" 290 parts by mass (solid content 50%, hydroxy hydrazine 50 of solid content, manufactured by Dainippon Ink and Chemicals Co., Ltd.) Charge inhibitor "Knop Costa de SNA-2" 2 parts by mass [Imidazoline type cationic antistatic agent, manufactured by Sunopuco] © Polyisofluoric acid ester solution "CORONATE HL" 40 parts by mass [solid content: 75%, HDI, and an effective NCO content of 17% in a solid component, manufactured by Japan Polyurethane Industry Co., Ltd.) The mixture was stirred and mixed with a dispersing mixer to obtain a coating material for a diffusion layer (a). Addition of porous cerium oxide particles With respect to the amount of the binder resin solid content is 20% (mass ratio). <<Preparation step of coating for diffusion layer (b)>> Toluene 270 parts by mass ® cyclohexanone 74 parts by mass Shaped porous ceria "Serexia 430" 35 parts by mass [average pore diameter: 17 nm, pore volume : 1.25 ml / g, volume average particle diameter (according to the laser method): 4.1 μηι, Fuji Silesia Chemical Co., Ltd.] Acrylic resin solution "Akly Dick WDU-938" 290 parts by mass of antistatic agent " Nop Costa de SNA-2" 2 parts by mass of polyisocyanate solution "Cronette HL" 40 parts by mass The above mixture is stirred and mixed with a dispersing mixer to obtain a coating for a diffusion layer (b) ° !«: -34- 201022711 The amount of the porous cerium oxide particles added was 20% by mass based on the solid content of the resin binder. <<Preparation step of coating material for diffusion layer (c)>> Toluene 270 parts by mass of cyclohexanone 74 parts by mass of porous erbium dioxide "Serexia 440" 35 parts by mass [average pore diameter: 17 nm, pore volume: 1.25ml/g,

Volume average particle size (according to the laser method): 6.2 μηη, manufactured by Fuji Silesia Chemical Co., Ltd. Acrylic resin solution "Arkidike WDU-938" 290 parts by mass of antistatic agent "Nopkosta de SN Α - 2" 2 parts by mass of the polyisocyanate solution "Colenet HL" 40 parts by mass The above mixture was stirred and mixed with a dispersing mixer to obtain a coating material (c) for a diffusion layer. In this case, the amount of the porous cerium oxide particles added is 20% by mass based on the solid content of the resin binder. <<Preparation step of coating material for diffusion layer (d) 250 parts by mass of 72 parts by mass of toluene cyclohexanone indefinite shape porous cerium oxide "Serexia 3 5 0" 27 parts by mass [average pore diameter: 21 nm, pores Volume: 1.60 ml/g, volume average particle diameter (according to the laser method): 3.9 0111, Fuji Silesia (8111 &amp; Chemical Co., Ltd.) Acrylic resin solution "Akudick WDU-938" 300 mass Part of the anti-static agent "Nop Costa De SNA-2" 2 parts by mass of polyisocyanate solution "Cronette HL" 40 parts by mass -35 - 201022711 The above dispersion mixture is stirred and mixed to obtain a coating for a diffusion layer (d) . In this case, the amount of the porous cerium oxide particles added is 15% by mass based on the solid content of the resin binder. <<Preparation step of coating material for diffusion layer (e)) Toluene 25 parts by mass of cyclohexanone 72 parts by mass of amorphous ceria "Selicia 25 0N" 27 parts by mass [average pore diameter: 24 nm, fine pores Volume: 1.80 ml / g, ® volume average particle diameter (according to the laser method): 5.7 μm, manufactured by Fuji Silesia Chemical Co., Ltd. Acrylic resin solution "Akudick WDU - 93 8" 3 00 parts by mass to prevent electricity "Noposta SNA-2" 2 parts by mass of a polyisocyanate solution "Cronette HL" 40 parts by mass The mixture was stirred and mixed with a dispersing mixer to obtain a coating material (e) for a diffusion layer. In this case, the amount of the porous cerium oxide particles added is 15% by mass based on the solid content of the resin binder. <<Preparation step of coating material for diffusing layer (f) 〇 Toluene 286 parts by mass of cyclohexanone 76 parts by mass of porous cerium oxide "Selicia 5 50" 50 parts by mass [average pore diameter: 7.0 nm, fine Pore volume: 0.80 ml/g, volume average particle diameter (according to the laser method): 3.9 μm, manufactured by Fuji Seli Chemical Co., Ltd. Acrylic resin solution "Akudick WDU-938" 274 parts by mass of antistatic agent "Nop Costa DeSN A - 2" 2 parts by mass of polyisocyanate solution "Cronette HL" 3 7 parts by mass - 36 - 201022711 The above mixture is stirred and mixed with a dispersing mixer to obtain a coating for the diffusion layer (f)» In the case, the amount of the porous ceria particles added is 30% by mass based on the solid content of the resin binder. <<Preparation step of coating material (g) for diffusion layer> Toluene 3 10 parts by mass of cyclohexanone 70 parts by mass of standard spherical acrylic urethane resin particles "BC-79" 100 parts by mass [volume average particle diameter about 6μιη, manufactured by 岐阜 胶 制造 〕 〕 丙烯酸 Acrylic resin solution "Ark Dick WDU - 93 8" 160 parts by mass antistatic agent "Noposta SN Α - 2" 5 parts by mass of polyisocyanate solution " 22 parts by mass of Ronet HL" The above mixture was stirred and mixed with a dispersing mixer to obtain a coating (g) for a diffusion layer. In this case, the amount of the resin particles added is 100% by mass based on the solid content of the resin binder. <<Preparation Step of Coating for Diffusion Layer (h)>> Toluene cyclohexanone 3 1 〇 parts by mass 70 parts by mass of non-standard spherical acrylic fine particles "Tek polymer L - XX-24BF" 1 part by mass [average particle Diameter 3~12μιη (ball-converted diameter), Sekisui Chemicals Co., Ltd.] Acrylic resin solution "Arkidike WDU-938" 160 parts by mass antistatic agent "Nuopu Costa De SNA-2" 5 mass parts 22 parts by mass of the isocyanate solution "Colenet HL" The mixture was stirred and mixed with a dispersing mixer to obtain a coating material (h) for a diffusion layer. In the case of -37-201022711, the amount of the resin particles added is 100% by mass based on the solid content of the resin binder. <<Preparation Step of Coating for Diffusion Layer (i)>> Toluene 3 10 parts by mass of cyclohexanone 70 parts by mass of non-standard spherical acrylic fine particles "HK-1 030" 100 parts by mass [volume average particle diameter 3. Ομιη , manufactured by Kyoritsu Chemical Co., Ltd.] Acrylic resin solution "Arkidike WDU - 93 8" 160 parts by mass ® Anti-static agent "Noposta SN A-2" 5 parts by mass of polyisocyanate solution "Cronette" 22 parts by mass of HL" The above mixture was stirred and mixed with a dispersing mixer to obtain a coating material (i) for a diffusion layer. In this case, the amount of the resin particles added is 100% by mass based on the solid content of the resin binder. &lt;Preparation step of coating material for diffusion layer (j)" Toluene 310 parts by mass of cyclohexanone 70 parts by mass of standard spherical acrylic fine particles "MX-500" 1 〇〇 by mass [volume average particle diameter 5.0 μπι, comprehensive chemical Company system] Acrylic resin solution "Arkidike WDU - 93 8" 160 parts by mass of anti-static agent "Nop Costa de SN A-2" 5 parts by mass of polyisocyanate solution "Cronette HL" 22 parts by mass The above mixture was stirred and mixed with a dispersing mixer to obtain a coating (j) for a diffusion layer. In this case, the amount of the resin particles added is 1% by mass (mass ratio) with respect to the solid content of the resin binder. -38- 201022711 "Preparation step of coating material for diffusion layer (k)" Toluene 270 parts by mass of cyclohexanone 74 parts by mass of spherical porous cerium oxide "Cylos Fiera C-1 504" 35 parts by mass [fine pore volume : 1.5 ml/g, volume average particle diameter (according to the laser method): 4.5 μπι, manufactured by Fuji Siricia Chemical Co., Ltd. Acrylic resin solution "Aku Dick WDU — 93 8" 2 90 parts by mass of antistatic agent " Knop Costa SN Α - 2" 2 parts by weight

Polyisocyanate solution "Colenet HL" 40 parts by mass The above mixture was stirred and mixed with a dispersing mixer to obtain a coating material (k) for a diffusion layer. In this case, the amount of the porous cerium oxide particles added is 20% by mass based on the solid content of the resin binder. <<Preparation step of coating material for diffusion layer (1) Toluene 250 parts by mass of cyclohexanone 72 parts by mass of amorphous ceria "Selicia 420" 27 parts by mass [average pore diameter: 17 nm, pore volume: 1.25 ml / g, volume average particle diameter (according to the laser method): 3.1 μιη, manufactured by Fuji Silesia Chemical Industry Co., Ltd. Acrylic resin solution "Aku Dick WDU-938" 300 parts by mass [solid content 50%, solid content Hydroxyl hydrazine 50, manufactured by DIC Corporation] Charge inhibitor "Nop Costa De SNA-2" 2 parts by mass [Imidazoline type cationic charge inhibitor, manufactured by Sanno Pico Corporation) Polyisocyanate solution "Colenet" HL" 40 parts by mass - 39 - 201022711 [75% solid content, HDI system, 17% effective NCO content in solid content, manufactured by Japan Polyurethane Industry Co., Ltd.) The mixture was stirred and mixed with a dispersing mixer to obtain a diffusion layer. In the case of the coating material (1), the amount of the porous cerium oxide particles added was 15% by mass based on the solid content of the resin binder. <<Preparation step of coating material (m) for diffusion layer> Toluene 286 parts by mass of cyclohexanone 76 parts by mass 〇Indefinite shape porous cerium oxide "Serici 420" 50 parts by mass [average pore diameter: 17 nm, pore volume : 1.25 ml/g, volume average particle diameter (according to the laser method): 3.1 μιη, manufactured by Fuji Siricia Chemical Industry Co., Ltd. Acrylic resin solution "Aku Dick WDU-93 8" 2 74 parts by mass [solid content 50%, hydroxy hydrazine 50 of solid content, manufactured by DIC Corporation] Charge inhibitor "Nop Costa SN Α 2" 2 parts by mass

[Imidazoline type cationic charge inhibitor, manufactured by Sunopuco Co., Ltd.] AV polyisocyanate solution "Colenet HL" 37 parts by mass [solid content 75%, HDI system, effective NCO content in solid content 17%, manufactured by Japan Polyurethane Industry Co., Ltd. The above dispersion and mixing machine were mixed with a dispersing mixer to obtain a coating material (m) for a diffusion layer. In this case, the amount of the porous cerium oxide particles added is 30% by mass based on the solid content of the resin binder. (Examples 1 to 7 and Comparative Examples 1 to 6) "Step of Coating, Drying, and Hardening of Substrate" - 40 - 201022711 As a substrate, a polyethylene terephthalate (PET) film having a thickness of 38 μm was used. In the first embodiment, the coating material for a diffusion layer (a) was applied to one surface of a substrate so as to have a dry film thickness of 4.1 μm, and dried by hot air to obtain a dried coating film of a diffusion layer. Similarly, the coating materials for the diffusion layers (b), (c), (d), (e), and (k) are respectively dried to have a thickness of 7·1 μm, 8.8 μm, 7.6 μm, 7.5 μm, and 6.2 μm. The coating was applied to make it dry for Examples 2 to 6. In addition, the coating materials (1) and (m) for the diffusion layer were applied so as to have a dry film thickness of 4·0 μm and 4.6 μm, respectively, and dried in Examples 7 and 2, respectively. In the same manner, the coating material for the diffusion layer (f) was applied so as to have a dry film thickness of 6·6 μm, and dried to be Comparative Example 1, and the coating material for the diffusion layer (g) to (j) was used. Any of them was applied so as to have a dry film thickness of 3.0 to 10. Ομηη, and the dried ones were Comparative Examples 3 to 6 (see Table 1 for the correspondence between the coating material for the diffusion layer and the thickness of the coating film). After the end of the coating step, it was kept in a constant temperature room at 40 ° C for 48 hours in order to promote the hardening reaction. In the above-described examples and comparative examples, as described later, each of the corrugated stripe-preventing films produced by using the light-diffusing layer containing various diffusing particles has a wave streak suppressing effect of a certain level or more and does not reduce the front luminance as much as possible. The ratio of the content of the diffusion particles and the ratio (t/d) of the film thickness (t) of the light diffusion layer to the volume average particle diameter (d) of the diffusion particles was adjusted. "Step of Making Bracts" As a substrate, a PET film having a thickness of 38 or 25 μm is used. On the surface of the substrate, the ultraviolet curable resin composition was heated to about 80 ° C to lower the viscosity, and coated to a thickness of 30 μm by a die coating method. Ultraviolet hard -41- 201022711 A chemical resin composition is used in the composition of UD27-960 (a mixture of an unsaturated polyester, an acrylate monomer, and a photoinitiator, manufactured by DIC Corporation). Next, a flat mold having a prism pitch of 12.4 μm, a height of ΙΟμηη, and an apex angle of 64 degrees was formed by heating together with the substrate on which the uncured resin layer was formed at 11 ° C for 2 minutes. . Thereafter, the uncured resin layer on the substrate is laminated on the surface of the mold, and the substrate is lightly pressed from the back surface of the substrate, and then ultraviolet rays are irradiated from the back side of the substrate to cure and fix the uncured resin. The ultraviolet lamp uses a high-pressure mercury lamp, and the irradiation energy is 6,000 mJ in total. When the laminate of the mold, the resin, and the substrate is cooled to near room temperature, and the substrate is peeled off from the mold, a predetermined flaw is formed on the surface of the substrate. · "Evaluation of Optical Characteristics" Decomposes the backlight unit of a commercially available mobile phone, and removes the four films (the light diffusing film, the two pieces of the film, and the light diffusing film for the upper side) which are to be mounted, and the film which will be produced as described above. The kneading surface was placed on the light-emitting surface side of the light guide plate, and the wavy stripe suppressing film of the present invention was laminated on the exit surface side, and then incorporated into the backlight unit, and the front surface luminance of the backlight unit was measured. The measuring device used a multi-point luminance meter EyeWin3 90c (manufactured by Vision Systems). The measurement area is a light-emitting surface of the backlight unit, and the left and right ends of the light-emitting surfaces of the backlight units are not limited by a width of 15% of the full banner, and the center portions of the light-emitting surfaces of the backlight units are not limited by a width of 15% of the full vertical width. Rectangular area. This measurement area is divided by 3 at 3x3, and the brightness of each area is measured, and these averages are taken as the front side luminance. (Reference Example 1) -42- 201022711 Using the backlight unit of a commercially available mobile phone, four optical sheets (lower light-diffusing film, two pieces of enamel, and light-diffusing film) of the standard structure are used as they are. evaluation of. (Reference Example 2) The above-described cymbal sheet was placed so that the prism surface became the light-emitting surface of the light guide plate, and the optical characteristics were evaluated. The front luminance of this Reference Example 2 in which the corrugation suppression film was not inserted was used as a reference for evaluating the front luminance when the corrugation suppression film was inserted. <<Brightness Reduction Rate>> The difference between the front luminance 値 obtained by the wavy stripe suppression film produced in each of the examples and the comparative example and the front luminance 値 of Reference Example 2 was divided by the front luminance 参考 of Reference Example 2, and the luminance reduction was calculated by the following equation. rate. ((Front brightness 値 of Reference Example 2) 1 (each front brightness 値)) xi 〇〇 / (Front brightness 値 of Reference Example 2) Regarding the evaluation of the waveform stripe, the liquid crystal cell of the mobile phone is placed on the measurement of the above brightness. The backlight unit was visually confirmed and evaluated according to the following five levels of evaluation criteria. The “Wavelet Streak Evaluation” evaluation 値 1 clearly confirms the generation of the waveform fringes and the brightness uniformity is also low. Evaluation 値 2 Brightness uniformity is improved, but the generation of waveform streaks can be clearly confirmed. Evaluate 値 3 ψΐ Π - 糊 paste, but the presence of wavy stripes can be easily confirmed. Evaluation 値 4 The waveform streak can be confirmed by the annotation. -43- 201022711 Evaluation 値 4.5 The wavy stripes can be confirmed by gaze. Evaluation 値5 Wave streaks cannot be confirmed at all. <<Measurement Method of Film Thickness of Light-Diffusion Layer>> The film thickness of the light-diffusing layer was measured by an electronic micrometer K402B (manufactured by Anritsu Co., Ltd.) at 10 points, and an average of 値 was obtained from three points of the smaller one. In the wavy stripe suppressing film of the present invention, the thinness of the film can be sufficiently achieved without lowering the front luminance of the display unit of the backlight unit or the liquid crystal display device, and the generation of wavy stripes can be prevented, but the front luminance is improved and © backlight The reduction in the waveform fringe of the unit or the liquid crystal display device is that the trade-off relationship does not change. In the state where the waveform fringes hardly occur, the waveform fringe evaluation 値 is 4 or more, so the level which is practically no problem is set to 4 or more. Regarding each of the waveform stripe suppression films of the examples and the comparative examples produced by the method of realizing the waveform fringe evaluation 値 4.5 which is considered to be substantially completely suppressed by the waveform stripe, various characteristics including the front luminance are evaluated other than the waveform fringe evaluation 値How, the evaluation results are shown in Table 1. The luminance reduction rate in Table 1 indicates the luminance reduction rate at the time of suppressing the film by using each of the waveform stripe with respect to the front surface of the structure of Reference Example 2. "Evaluation of Coating Adhesiveness" A cellophane tape (registered trademark) (width: 15 mm) made by Nikko Co., Ltd. was attached to a light-diffusing layer, and the tape was peeled back by a 5 kg-loaded rubberized roller, and the tape was peeled off. The peeling of the diffusion layer after peeling was determined as follows. The evaluation results are shown in Table 1. 〇...There is no peeling of the film at all △...The area of film peeling is less than 30% of the area of the tape. -44- 201022711 χ...The area of film peeling is more than 30% of the area of the tape. Evaluation> By visual observation of the state of the paint, a comparison is made between the pot life of the paint (the time when the paint is gelled and cannot be used). The evaluation of the pot life was based on the coating of Example 1 having a practical period in which there was no practical problem, and the following criteria were used. The evaluation results are shown in Table 1. 〇... has a pot life of standing in a room at 23 ° C for 24 hours or more and standing in a 40 ° C thermostatic chamber for 12 hours or more. Ο △... has a pot life of standing in a room at 23 ° C for 12 hours or more and 24 hours or less, and standing in a 40 ° C thermostatic chamber for 6 hours or more and 12 hours or less. X ... has a pot life of standing at 23 ° C for 12 hours or less and standing in a 40 ° C thermostatic chamber for 6 hours or less.

-45- 201022711 Table 1 籣 《 《 《 《 成 成 成 成 成 成 成 成 成 成 / / / / / / rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn ε) mam ft%) No. iEmm fcd/n?) mm Fresh (·/.) Really depends on 1 a *W· Porous two gasification. 3.1 US not 204.1 1.3 4.5 2009 15.9 0 0 2 b 4.1 1.25 娜娜20 ΊΑ 1.7 4.5 2036 14.8 o ο 3 c 6.2 1.25 Amorphous 20 Μ 1.4 4.5 2017 15.6 o 0 4 d Gas Jaya 3*9 1.6 Buna 15 U 1.9 4.5 1940 18.8 o 0 5 e 5.7 1.8 No trace 15 1Λ 1.3 4·5 1949 18.5 o ο 6 km 4.5 1.5 m 20 1.6 1961 17.9 o ο 7 1 Air bright sub: 3.1 1.25 No shift 15 Μ 1J 4 2355 1.5 o ο than paste 1 r S5®55 porous - Oxidation is 3.9 0.8 No trace 30 1.1 4.5 2039 14.7 厶Δ 2 m 3.1 1.25 不娜30 Μ 1.5 5 1951 1&amp;4 Δ Δ 3 g BC-79 Propylene Gamine off if 6 - mm- too 1〇- 4.5 1859 22.2 Δ Δ 4 h followed by · nmm lipid particles 3-12 -; tmmm 100 i 1.3 4.5 1901 20.5 Δ Δ 5 i HK-1030 3 - mmm. 100 1 0.6 4.5 1752 26.7 Δ Δ 6 j MX-SOO 5 - mm» 100 5 1.1 4.5 1789 25^1 Δ Δ Reference example 1 - - - - - -. • _ 5 2215 7.3 - 2 - - - - - -, _ = - ΐ 2390 0 - -

Reference Example 1: Four optical sheets which are standard structures of the backlight unit are used (the film is thinned, the two sheets are thinned, and the front side is thinned and the front side brightness is measured.) Reference Example 2: Only the enamel sheet is used as the light guide sheet exit surface. In the side mode configuration, the front luminance luminance reduction rate was measured: the luminance reduction rate with respect to the front luminance 値 of Reference Example 3 is as shown in Table 1, and the pore volume of the multi-L particle was 1.25 ml/g. ～3 suppresses the wave streaks and ensures high front luminance, and can achieve thinning of the light diffusion layer. On the other hand, in the case of Example 7 in which the content of the porous particles is reduced, the evaluation of the waveform fringe is slightly lowered. However, the front side brightness is greatly increased. Conversely, when the content of the porous particles is increased, as shown in Comparative Example 2, the evaluation of the wavy streaks is improved, but the front side brightness is lowered, and the relative amount of the resin binder is decreased, so the diffusion layer and the diffusion layer are The bonding strength of the substrate is lowered, and the pot life of the coating material is also shortened. In the fourth and fifth embodiments in which the pore volume of the porous particles is large, the front luminance tends to be slightly lowered, but the practical level is On the other hand, in Comparative Example 1 in which the pore volume of the porous particles was reduced to 0.80 ml/g, in order to suppress the wavy streaks, it was necessary to increase the mass of the diffusion material in the resin binder to 30%, and as a result, the resin was bonded. The relative amount of the agent is reduced, so the bonding force of the diffusion layer and the substrate is lowered to -46 - 201022711, and the pot life of the coating is also shortened. For example, Comparative Examples 3 to 6

When resin particles are used in the diffusion material, in order to suppress the wavy streaks, a large amount of a diffusing agent must be added, and the front luminance is greatly lowered, and the bonding strength between the diffusion layer and the substrate and the pot life of the coating are also lowered. In the case of using the spherical porous ceria as the diffusion material, as in the case of the sixth embodiment, the porous material containing 20% by mass of the porous particles is used as the diffusion material in the solid component, and the porous material having the amorphous shape is used. In the case of Examples 1 to 3 of cerium oxide, the front luminance tends to be lowered.

Furthermore, in terms of the area of the pore volume, in view of the area where the coating film adhesion or the coating pot life is not lowered, and the brightness reduction rate is also good, the wave streaks are further suppressed, and good front brightness is obtained. And begging. Further, in the production of the sample, it is considered that there is no problem in practical use if the waveform evaluation 値 is 4 or more, and the condition that the waveform fringe evaluation is reached 4 and the front luminance is as high as possible can be achieved. <<Preparation step of coating material for diffusion layer (P)>> Toluene 250 parts by mass

Cyclohexanone 72 parts by mass of porous cerium oxide "Selicia 420" 27 parts by mass [average pore diameter: 17 nm, pore volume: 1.25 ml/g, volume average particle diameter (according to laser method): 3.1 Pm, manufactured by Fuji Silesia Chemical Co., Ltd.] Acrylic resin solution "Arkidike WDU - 93 8" 300 parts by mass [50% solid content, hydroxyhydrazine 50 of solid content, manufactured by Dainippon Ink Chemical Industry Co., Ltd.) Antistatic agent "Noposta SNA-2" 2 parts by mass -47- 201022711 [Imidazoline type cationic antistatic agent, Sanoppoco public polyisocyanate solution "Cronette HL" [solid content 75% In the HDI system, the solid content is 17%, and it is made by Japan Polyurethane Co., Ltd.. When the above is stirred and mixed with a dispersing mixer to obtain a diffusion layer, the amount of porous ceria particles added is relative to the resin. The body composition is 15% (mass ratio). <<Preparation Step of Coating for Diffusion Layer (q)>> Toluene Cyclohexanone Indefinite Shape Porous Ceria "Sessia 430" [Average pore diameter: 17 nm, pore volume: 1.25 ml / volume average particle diameter ( According to the laser method): 4·1 μιη, made by Fuji Xi Lisi] Acrylic resin solution "Arkidike WDU-938" Charge inhibitor "Nop Costa De SNA-2" Polyisocyanate solution "Crone In the case of obtaining a diffusion layer, the amount of the porous cerium oxide particles added is 15% by mass based on the resin component. The preparation step of the coating material for the diffusion layer (r) Toluene cyclohexanone indefinite shape porous ceria "Selicia 440" system] 40 parts by mass of NCO content coating (P). 250 parts by mass of the binder, 72 parts by mass, 27 parts by mass, g, 30 parts by mass, 2 parts by mass, 40 parts by mass of the coating material (q) β, 250 parts by mass of the binder, 72 parts by mass, 27 parts by mass - 48 - 201022711 [Average pore diameter: 17 nm, pore volume: 1.25 ml/g, volume average particle diameter (according to laser method): 6·2 μm, manufactured by Fuji Siricia Chemical Co., Ltd.) Acrylic resin solution "Acre Dick WDU- 938" 300 parts by mass of antistatic agent "Noposta SNA-2" 2 parts by mass of polyisocyanate solution "Cronette HL" 40 parts by mass. The above is stirred and mixed with a dispersing mixer to obtain a diffusion layer. Coating (〇. In this case, the amount of the porous cerium oxide particles added is 15% by mass relative to the solid content of the resin binder. (Examples 7 to 16) "Coating, drying, and hardening of the substrate" Step: As a substrate, a polyethylene terephthalate (PET) film having a thickness of 38 μm was used, and the coating material for diffusion layer (P) was applied to the substrate at a dry film thickness of 5.8 μm and 9.8 μm. On the surface, The dried coating film obtained by the hot air drying to obtain the diffusion layer was the same as Examples 7 and 8. Similarly, the coating material for the diffusion layer (q) was applied in a square shape of a dry film thickness of 6.0 μm and 8.2 μm. The dry coating film obtained by the hot air drying to obtain the diffusion layer is the same as Examples 9 and 10. In the same manner, any of the coating materials for the diffusion layer (q) to (Γ) has a dry film thickness of 4.0 to 10.3 μm. The coating method was applied to a dry coating film which was dried by hot air to obtain a diffusion layer, and Examples 11 to 16 (see Table 2 for the correspondence between the coating material for the diffusion layer and the coating film thickness) were used. The curing reaction was carried out for 48 hours in a 40 ° C constant temperature chamber. In the examples and comparative examples, each of the wavy stripe-preventing films prepared by using a light-diffusion layer containing various diffusion-49-201022711 particles was used as described later. Adjusting the film thickness (t) and diffusion of the light diffusion layer by adjusting the content of the diffusion particles by evaluating the wave stripe suppression effect of 値4 with M waveform streaks and adjusting the front surface brightness as much as possible. The ratio of the volume average particle diameter (d) of the sub-particles (t/d) is produced by the manufacturer. "Production step of the ruthenium sheet" A PET film having a thickness of 38 or 25 μm is used, and the ultraviolet curable resin is composed on one side of the substrate. The material is heated to about 80 ° C to lower the viscosity, and is applied by a die coating method to a thickness of 30 μm. The ultraviolet curable resin composition is used with the United States RC27-9 60 (unsaturated polyester, acrylate). a mixture of a monomer and a photoinitiator, manufactured by DIC Corporation.) Next, a flat mold having a ruthenium pitch of 12.4 μm, a 稜鏡 height: ΙΟμηη, and a vertex angle of 64 degrees is formed and formed The substrates of the uncured resin layer were collectively heated at 110 ° C for 2 minutes. Thereafter, the uncured resin layer on the substrate is laminated on the surface of the mold, and the substrate is lightly pressed from the back surface of the substrate, and then ultraviolet rays are irradiated from the back side of the substrate to cure and fix the uncured resin. The ultraviolet lamp uses a high-pressure mercury lamp, and the irradiation energy is 600 mJ in total. The laminate of the mold, the resin, and the substrate is cooled to near room temperature, and the substrate is peeled off from the mold, and as a result, a predetermined crucible is formed on the surface of the substrate. The ruthenium sheet thus produced is used as a substrate, and the diffusion coating material is applied and dried so as to have a predetermined film thickness on the side opposite to the ruthenium surface, whereby wavy stripe suppression corresponding to Examples 7 to 16 can be produced. The picture of the function. The optical stripe suppression film and the ruthenium sheet thus produced were evaluated in the same manner as in Examples 1 to 7 and Comparative Examples 1 to 6, and various optical characteristics were evaluated. -50-201022711 In the wavy stripe suppressing film of the present invention, the thinness of the film can be sufficiently achieved without lowering the front luminance of the display unit of the backlight unit or the liquid crystal display device, thereby preventing the generation of wavy stripes, but the front luminance Increasing the waveform fringe reduction with the backlight unit or the liquid crystal display device is that the trade-off relationship does not change. In the following embodiments, the waveform fringe evaluation 状态 of the state in which the waveform stripe hardly occurs is 4 or more, so the level which is practically no problem is set to 4 or more, and when the evaluation of the waveform fringe is 4, a higher level is achieved. Frontal brightness, the evaluation results are shown in Table 2 (Table 2) 坛 ff ff ff 钡 钡 扩散 扩散 扩散 扩散 mM mM mM mM mM mM mM mM 用 用 用 用 用 用 用 RK RK RK RK RK RK RK RK RK RK RK RK RK RK RK RK RK RK RK RK RK RK Mpm (jt/m) pores (ml/g) shape average puller diameter waveform mt gryphon front (cd/m2) brightness drop m (·/.) Example 7 P Celesia 420 porous silica sand a 1 1. 25 Amorphous 15 5. 8 1.9 4 2183 8.7 Suitable for example 8 P Selicia 420 Porous gasification chopping 3. 1 1. 25 Amorphous 15 9.8 3.2 4 2170 9.2 Lion case 9 q Stuffed 430 Porous Dioxide More than 4. 1 1, 25 Unshaped 15 6. Ο 1.5 4 2176 9.0 10 P 430 Porous Silica: 4, 1 1. 25 Unshaped 15 8. 2 2.0 4 2164 9.4 . Example 11 Peri 420 porous dioxane a 1 1. 25 amorphous 15 4. 0 1.3 4 2151 10.0 1212 q 塞立酿430 Hole * Dioxide is more than 4,1 1. 25 Unshaped 15 9. 7 2.4 4 2138 10.5 Example 13 r , Meromorphic gasified sand, 6. Ξ 1. 25 Unshaped 15 10, 3 1.7 4 2131 10.8 Example 14 r abundance V e. s 1. 25 indefinite 铋 15 9. 2 1.5 4 2130 10.9 shed example 15 q 镰 镰 多孔 porous two gasification chopping. 4. 1 1. 25 amorphous 15 4_ 3 1.0 4 2118 11.4 Example 16 r Seleia porous silica sand 6. 2 1, 25 Amorphous 15 6.6 1.1 4 2103 12.0 (t/d ratio to frontal brightness) Used by "Serexia 42 0" The relationship between the film thickness/average particle diameter (t/d) and the front luminance is shown in Fig. 6 as a result of the porous cerium oxide (diffusion layer coating material (P)). As can be understood from the figure, it is found that a high front luminance can be maintained in the range of t/d of 1.3 to 2.1. On the other hand, when t/d is 1.3 or less and 2.1 or more, the front luminance tends to be lowered. It was found that especially when t/d was 1.3 or less, the decrease in front luminance was large. Further, in the case of -51 to 201022711, the decrease in the front luminance when the above range is exceeded is larger as the volume average particle diameter of the porous particles used is larger. On the other hand, when the volume average particle diameter is 3. Ιμηη or less, the unevenness formed on the surface of the light-diffusing layer is small, the front luminance is improved, and the reduction width when t/d exceeds the above range is also small. As is apparent from Table 2, Examples 7, 8, 9, and 10 showed higher positive brightness, but were particularly preferable in the case where the thinning of the light diffusion layer was achieved in Examples 7 and 9. The film thickness of the pupil diffusion layer (υμιη and the volume average particle diameter of the foregoing porous particles (&lt;&lt;&gt;&gt;&lt;&gt;&gt; 1) The ratio t/d of μιη is preferably 1.3 or more. In the case of Example 15 and Example 16, although the thinning of the diffusion layer and the suppression of the wavy stripes are sufficiently achieved, the volume average particle diameter of the porous particles is sufficient. The film thickness of the light diffusion layer cannot be sufficiently obtained, and it is not necessarily sufficient at a point of high front luminance. Further, by comparison of Examples 13 and 14 with other examples, the volume average of the porous particles is obtained. When the particle diameter is 2 to 6 μm, it is difficult to produce irregularities in which porous particles are added to the surface of the light-diffusing layer, and it is difficult to cause scattering with a large distance from the surface of the positive surface, so that higher front luminance can be obtained. Examples 7 and 8 are obtained. It is understood that the volume average particle diameter is 2.0 to 3.1 μπι at a point where the front brightness is maintained at a high height. When a porous particle having a large volume average particle diameter is used as a diffusion material, When the light-diffusing layer is formed into a thin film, the film thickness of the light-diffusing layer cannot be sufficiently obtained for the volume average particle diameter of the porous particles, so that a high front luminance cannot be obtained, and even if t/d is in the range of 1.3 to 2.1 The thickness of the diffusion layer also becomes thicker, and the front luminance tends to decrease. Further, 'if the film thickness of the light diffusion layer (μ) μη is equal to the volume of the porous particles described above - 52 - 201022711, the ratio of the average particle diameter (ά) μιη When /d exceeds 2.1, the tendency of the front luminance to decrease is also understood from Fig. 6. Especially in the case of porous particles having a volume average particle diameter of more than 3.5 μm, the film thickness of the light diffusion layer itself becomes thick, so the wavy stripes It is difficult to reduce the thickness of the entire backlight unit, and it is difficult to reduce the thickness of the entire backlight unit. In the case of Example 12, the film thickness (1) of the light diffusion layer becomes thicker than the volume average particle diameter (d) of the porous particles. When t/d exceeds 2.1, the front luminance starts to become low. On the other hand, in the case of the eleventh embodiment, t / d is low and is 1.3, so the front luminance starts to decrease. [Simple description of the drawing] Fig. 1 Display liquid crystal display An exploded view of an example of a general configuration of the device. Fig. 2 is a perspective view showing a configuration of a backlight unit on the side of the exit surface of the light guide plate on which the cymbal is disposed. Fig. 3 is a view showing the backlight from Fig. 2 The light path of the light source of the unit - a part of the memory diagram. Fig. 4 is a view showing the structure of the backlight unit on the exit surface side of the light guide plate and the part of the light path from the light source. A perspective view showing a structure of a backlight unit having a wavy stripe suppressing film of the present invention. Fig. 6 is a view showing a light diffusing layer of a wavy stripe suppressing film in a liquid crystal display device having a backlight unit using the wavy stripe suppressing film of the present invention. A graph showing the change in the front side luminance when the ratio t/d of the film thickness (the volume average particle diameter (μΐ) μιη of the porous particles is changed. [Main component symbol description] 1 LCD module-53- 201022711 Ο ❹ 2 Backlight unit 3 Light source 4 Reflective film 5 Light guide plate 6 Reflecting sheet 7 Light diffusing film (lower diffusing film) 8 Septum 9 Light diffusing film (upper diffusing film) 12 Previously general backlight unit 1 3, 23 Light source 1 5, 25 Light guide plate 17 Light diffusing film (lower diffusing film) 18 Previously conventional cymbal 19 Base 20 Array 22 has an exit surface 3 0 3 toward the light guide plate 1 32 33 34 35 36 The backlight unit of the cymbal of the cymbal is disposed toward the exit surface side of the light guide plate, and the ruthenium substrate of the cymbal array is arranged. The light diffusion layer of the ruthenium substrate is transparent. The light diffusion layer of the present invention is a waveform of the present invention. Stripe suppression film • 54-

Claims (1)

201022711 VII. Patent application scope: 1. A wavy stripe suppressing film which is disposed on a side of an exit surface of a ruthenium which is disposed on an exit surface of a light guide plate of a backlight unit toward a ruthenium surface, Further, the surface of the light-transmitting substrate has a light-diffusing layer containing a resin binder and a porous particle, and the pore volume of the porous particle is 1.00 to 2.00 ml/g, and the content of the porous particle is bonded to the resin. The solid content of the agent is 100 parts by mass or less. © 2. The corrugated stripe pattern of claim 1, wherein the porous plasmid is amorphous. 3. The wavy stripe suppressing film according to claim 1 or 2, wherein the porous particle is porous ceria. 4. The wavy stripe suppressing film according to claim 1 or 2, wherein the porous particle has a pore volume of 1.8 ml/g or less. 5. The wavy stripe suppressing film according to claim 1 or 2, wherein a ratio of a film thickness of the light diffusing layer to a volume average particle diameter (&lt;1) μιη of the porous particle t/ d is 1.3 or more. 6. The wavy stripe-suppressing film according to claim 1 or 2, wherein the porous particles have a volume average particle diameter of from 2 μm to 6 μm. 7. The wavy stripe suppressing film according to claim 1 or 2, wherein a ratio of a film thickness of the light diffusing layer to a volume average particle diameter (&lt;1) μηι of the porous particle t/d It is 2.1 or less. 8. The wavy stripe suppressing film according to claim 1 or 2, wherein the porous particles have a volume average particle diameter of 2 to 3.1 μη. The wave stripe suppression film according to claim 1 or 2, wherein the light diffusion layer has a film thickness of 8 μm or less. A corrugated stripe suppressing film according to claim 1 or 2, wherein the full thickness of the stripe suppressing film is 20 μm to 300 μm. 11. A ruthenium sheet having a wavy stripe suppressing function, characterized in that it is formed with a light-transmitting substrate sandwiching a wavy stripe suppressing film according to claim 1 or 2, and having mutually opposite sides on the opposite side. The shape of the parallel corners. ® 12. A backlight unit characterized by having a wavy stripe suppressing film as claimed in claim 1 or 2. 13. A backlight unit characterized in that it has a light source disposed on at least one end surface side of the light guide plate and the light guide plate, and an exit surface on one side of the light guide plate has an attachment as in claim 11 A chip with a waveform stripe suppression function. A liquid crystal display device characterized by having a backlight unit as in claim 13 of the patent application. ❹ -56-