TW201015175A - Direct type backlight device - Google Patents

Abstract

This invention provides a direct type backlight device for a display device, which efficiently suppresses the luminance unevenness on tube and has high luminance even without utilizing an optical element subjected to special processing. The direct type backlight device of this invention is sequentially disposed with reflection material, a plurality of linear light sources and a group of optical members which satisfy the following (i) to (v) conditions. (i) The plurality of linear light sources are arranged such that each of the linear light source is parallel to one another in the length direction. (ii) The haze value of the optical member which is the closest one to the linear light sources among the optical member group, measured with incident light from the surface on the linear light source side according to JIS K 7136(2000), is less than 99.0%. (iii) In the optical member group there is a prism sheet. The prism sheet is formed of a plurality of convex shaped structures extended in one way on the surface opposite to the linear light sources side, wherein the length directions of the plurality of convex shaped structures are parallel with one another and the length directions of the plurality of convex shaped structures are parallel with the length directions of the plurality of linear light sources. (iv) The 60 DEG gloss of the reflection material measured on the surface of the linear light sources side according to JIS K 7105(1981), is less than 5. (v) Assuming that the distance between two adjacent linear light sources in the above plurality of linear light sources is L, and the distance from the center of the linear light source to the optical member, which is the closest distance to the linear light sources, is H, θ which satisfies the following formula (1) is 45 DEG ≤ θ ≤ 70 DEG. θ = tan-1((L/2)/H)...formula(1).

Description

201015175 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to various direct type backlight devices. [Prior Art] A liquid crystal display device is generally used, and includes a television set and an I use. The liquid crystal display device has a structure capable of being displayed by forming a backlight. Used as the light source that emits light throughout the picture. The backlight unit constitutes a large backlight. The main sign of this notebook computer, etc. In the case of the side-light type backlight, light is emitted from the side surface into the light guide surface to spread the surface of the surface in the entire surface, so that the front side of one of the plates is illuminated. In the side-light type backlight, a variety of optical films are used, and the light leaked from the smooth surface is reflected and then displayed, especially for the liquid crystal display device, which is applied to notebook computers, mobile phone monitors, car satellite navigation systems, and the like. Each of the central devices is provided with a backlight as a light source, and the light passes through the liquid crystal cell and is controlled, so that the characteristics required by the backlight device are not only, but also bright and uniform illumination can be divided into two types. 1. The side light is applied to, for example, a thinner and a smaller type. However, in the case where a light guide plate is used as a basic configuration, a light source and a plate are disposed on the side of the light guide plate, and the light is totally reflected inside the light guide plate. In addition to the above-mentioned configuration, the transmission film can be made to have energy in addition to the above-described configuration, while the light is transmitted from the total reflection condition of the light guide plate, and the light is used as the backlight, that is, the surface light source. a reflective film that functions as a back of the light guide plate, a diffuser that homogenizes the light emitted from the front surface of the light guide plate, a concentrating sheet represented by a diamond lens for improving the front brightness, and an improved liquid crystal panel The brightness of the brightness enhances the film and the like. The other way is called the direct type backlight. This method is suitable for applications in televisions that require large-scale and high-brightness. The basic configuration is characterized in that instead of using a light guide plate, the fluorescent tubes are arranged directly in the depth of the screen, or a plurality of point light sources are arranged. The LEDs are configured in a linear configuration. By arranging a plurality of linear or partially linear fluorescent tubes LED or LED linear light sources in parallel in the depth of the screen, it is possible to cope with a large screen and to ensure more brightness. However, because it is also a feature of the fluorescent tube or LED placed in the depth of the screen, it will produce brightness in the picture (bright spot), which makes the bright spot become the point of the fluorescent tube or LED and the line Like (later, called tube spot), it is the main reason for the deterioration of image quality. Therefore, in the direct type backlight, in order to eliminate the tube spot, a light diffusing plate having extremely high light diffusibility is disposed on the upper side of the fluorescent tube to obtain a uniform image (Patent Document 1). The light diffusing plate is a light diffusing plate composed of an acrylic resin or a polycarbonate resin in which fine particles are dispersed. By using the light diffusing plate to cancel the tube spot, the image can be uniformized, but in order to enhance the diffusion, the total light transmittance is lowered, the light utilization efficiency is deteriorated, and the light is also required to be excessively enhanced due to excessive diffusion. The direction is diffused, and as a result, the front luminance required is insufficient. Here, a diffusion sheet is disposed on the light diffusion plate, and the diffusion sheet displays one side of 201015175 to diffuse light while isotropically condensing light to the front side. This diffusion sheet is called a sheet of a bead sheet, and the diffusion of fine particles containing organic crosslinked particles or the like on the bead is different from that of the light diffusion sheet, and is an optical film which shows a certain degree of directivity toward the front surface. In addition to the above, a reflecting member that reflects light from a fluorescent tube or LED light, a condensing sheet represented by a diamond lens, and a light emitted from a fluorescent tube or an LED are provided on the liquid crystal panel. The brightness-increasing film type for brightness is used to form a direct-type backlight device. However, in recent years, attention has been paid to thin-type electric backlights, or from the viewpoint of environmental protection to reduce the amount of fluorescent tubes to be mounted. Straight-type backlights, silver, etc., which have a small amount of precious metal, have a small amount of light source, and the LEDs are likely to cause tube spots or insufficient brightness. Q The use of a plurality of the aforementioned optical elements causes an increase in cost in thinning. In addition, there is a concern that the use of the optical element component is increased, and the environmental burden is increased. In order to solve the above problems, it has also been proposed to improve the work of various sheets by a rhombic shape having a zigzag cross section (Patent Document 2), or to add a reflection member, so that it can be suitably applied. This cross section is a method of a zigzag pattern (Patent Document 3). The concentrating effect granules in the direction are attached to the base material layer, and the directivity of the direction of the bead sheet is emitted toward the rear, and the condensing property is separated by polarized light, and the direct force of each camera is combined for the purpose of cutting or It is equipped with an underwater type backlight. Therefore, it is necessary to have a difficulty, or a light-spreading of a diamond-shaped light-emitting plate that can be integrated or formed into a protrusion on the consumer's electric diffusion plate at the time of the production. [Patent Document 1] Japanese Laid-Open Patent Publication No. 2004-29091 [Patent Document 2] [Patent Document 3] Japanese Patent Laid-Open Publication No. JP-A-2006-155926 (Patent Document) [The subject matter of the invention] However, it has a very strong light diffusibility as in Patent Document 1. In the light diffusing plate, although it has the effect of eliminating tube spots and improving the uniformity of the screen, the total light transmittance is not large, which causes difficulty in high brightness. Further, in the method of applying a molding process to a light diffusing plate or a reflecting member as in Patent Documents 2 and 3, it is not only not ideal in terms of cost or productivity, and it is difficult to achieve both the uniformity and the brightness, and actually I have not been able to find an effective countermeasure. The present invention has been made in view of the background of such a prior art, and provides a direct type backlight device which can not only effectively suppress tube spots but also can be used for a display device of high brightness. That is, the present invention provides a direct type backlight device which is used for the optical member without special processing, can effectively suppress the tube spot, and can be used for a display device of high brightness. (Means for Solving the Problem) In order to solve the above problems, the present invention adopts the following configuration. In other words, the direct type backlight device of the present invention is provided with a reflective material, a plurality of linear light sources, and an optical element group in sequence, and the direct type backlight device satisfies the following conditions (i) to (V): (i) the plural The linear light sources are arranged in such a way that the length direction of each linear light source is parallel to 201015175; (ii) according to JIS K 7 136 (2000), the optical element closest to the linear light source in the optical component group The haze 测 measured by the light incident on the surface of the linear light source is 99.0% or less; (iii) having a diamond lens in the optical element group, the surface of the diamond lens on the side opposite to the linear light source side Forming a plurality of convex shapes extending in a single direction, the longitudinal directions of the plurality of convex shapes are parallel, and the longitudinal direction of the plurality of convex shapes is parallel to the longitudinal direction of the plurality of linear light sources; ❹ (iv) according to JIS K 7105 (1981), the 60° gloss measured on the side of the linear light source side of the reflective material is 5 or less; (v) the center of the adjacent linear light source among the plurality of linear light sources The distance between them is L, and from the center of the linear light source to the nearest Distance of the optical element is a linear light source Η, 0 satisfies the equation (1) of 45. S Θ S 70. . Θ = tan1 ((L/2) / H) ... Equation (1) 〇 (Effect of the Invention) According to the present invention, it is possible to provide a direct type backlight device which can be provided even without using a specially processed optical member It effectively suppresses tube spots and can be used for high brightness display devices. [Embodiment] The present invention is directed to the above-described problems, that is, a direct type backlight device for achieving suppression of tube spots, and a combination of optical members and optical characteristics of optical members, which are intentionally reviewed and have specific optical characteristics. Using 201015175 after a specific combination, we found a way to solve the above problems even if no special processing is applied to the optical member. In the direct type backlight device of the present invention, a reflective material, a plurality of linear light sources, and an optical element group are sequentially disposed, and the direct type backlight device satisfies the following conditions (1) to (V): (i) the plurality of linear light sources The longitudinal direction of each linear light source is arranged in parallel; (ii) According to JIS K 7 1 36 (2000), the optical element closest to the linear light source in the optical element group is from the linear light source side. The haze 测 measured by the incident light is 99.0% or less; (iii) having a rhombohedron in the optical element group, the rhinge lens being formed in a single direction on a surface opposite to the linear light source side a plurality of extended convex shapes, the longitudinal direction of the plurality of convex shapes being parallel, and the longitudinal direction of the plurality of convex shapes being parallel to the longitudinal direction of the plurality of linear light sources; (iv) according to JIS K 7 105 (198 1 (year), the 60° gloss measured on the side of the linear 0 source side of the reflective material is 5 or less; (v) the distance between the centers of adjacent linear light sources among the plurality of linear light sources L, and from the center of the linear light source to the closest to the linear light source When the distance from the optical element is Η, 0 which satisfies the following equation (1) is 45 ° S 0 S 70. . Θ = tan1 ((L/2) / H) ... (1) When the above-described direct type backlight device is constructed, the reason why the tube spot can be suppressed cannot be ascertained, but the reason may be derived from the following reasons. -10- 201015175 In other words, it is estimated that the light that has reached the reflective material side in the light emitted by the fluorescent tube or the LED is reflected until it is incident on the lens, and is diffused at a certain angle on the reflective material. Reflecting and diffusing the diffuse reflected light having the angle through the optical member having the haze of (ii) to diffuse again, so that when it reaches the lens, it is suitable for the angle change function of the prism The angle is diffused, and the function of suppressing the tube spot is exerted. Hereinafter, each member will be described in detail. In the direct type backlight device of the present invention, (i) the plurality of linear light sources are arranged such that the longitudinal directions of the respective linear light sources are parallel. The linear light source may be a linear light source, an OJ tube or a W tube having a straight portion in the light source, a point light source arranged in a line shape, or a linear view. The light and dark are not particularly limited. For example, it is preferable to arrange the LEDs (white type and RGB type) of the fluorescent tube or the point light source represented by the cold cathode tube in a line shape. These lines are oriented in the direction of the length of the linear light source. Q In the direct type backlight device of the present invention, (i) the linear light sources are arranged in plural in parallel. The plurality of linear light sources may be arranged substantially in parallel so as not to be closely arranged in parallel, and the acute angle formed by the longitudinal direction of each of the linear light sources may be 10 or less. Further, it is preferable that the arrangement pitch of the light sources is different in the plane of the direct type backlight device. For example, in the case where it is desired to illuminate the central portion of the direct type backlight device, this can be achieved by reducing the arrangement pitch of the light sources in the central portion of the screen. In addition, at the end of the screen, since it is darkened near the frame edge of the frame at 201015175, the portion can be illuminated by reducing the arrangement pitch. As described above, in order to adjust the brightness in the screen, it is preferable to use an arrangement in which the arrangement pitch of the light sources is not equal, and it is possible to exhibit an illumination effect. The direct type backlight device of the present invention requires (ii) a mist measured by light incident on the surface of the optical element group closest to the linear light source from the side of the linear light source according to JIS K 7136 (2000). Degrees are below 99.0%. When the haze is greater than 99.0%, it is estimated that excess diffused light will increase, and even for a direct type backlight that satisfies the conditions of (i), (iii), (iv), and (v), 管 cannot suppress the tube spot. . When the haze is 99.0% or less, the effect of suppressing the tube spot in the direct type backlight device can be obtained. Although the lower limit is not particularly limited, the substantially lower limit 値 is 〇.〇%. Although the smaller the haze is, the effect of suppressing the tube spot tends to decrease, but there is a favorable factor for obtaining high brightness. On the other hand, the larger the haze, the more the tube spot can be suppressed. Favorable factors can be selected according to the requirements and requirements. In the case of both the suppression effect and the brightness of the tube spot, there is also a combination with other members such as the reflective material φ, and it is impossible to understand the same, but the haze is 97.5 to 98.5%, and the obtained A direct type backlight device having a good performance balance is highly likely, and thus is preferable. The haze of the present invention is a turbidity meter (haze meter) NDH-2000 manufactured by Nippon Denshoku Industries Co., Ltd., and is measured in accordance with JIS K 7 1 36 (2000). First, after the standard alignment of the machine is performed, the above-mentioned members are cut into 8 cm squares to be shot at right angles (within an error of ±2°) from the side of the linear light source side provided in the direct type backlight device. It is measured by setting the parallel beam into -12-201015175. Five samples were measured for each of the four corners and the central portion of each of the five samples, and the average enthalpy at 25 points was taken as the haze. The reason why the effect of suppressing the tube spot can be obtained by disposing the optical member having a haze of 99.0% or less in the closest position to the linear light source is not provoked, but it may be caused by the following reason. In other words, it is presumed that when the light passing through the optical member disposed closest to the linear light source is incident on a diamond lens described later, the angle of incidence at the incident angle is suitable for the 〇 镜片 lens, because the haze is 99.0. When % is a boundary and exceeds this enthalpy, the suppression effect cannot be obtained. Therefore, the haze of the optical member to which the incident angle distribution is applied is 99.0% or less. An optical member having a haze of more than 99.0% and an optical member having a haze of 99.0% or less are disposed in order from the side of the linear light source, and the effects of the present invention are not obtained. When the haze of the optical member closest to the linear light source is 99.0% or less, it may be any material or form, and examples thereof include an acrylic resin, a polystyrene resin, a 0 polycarbonate resin, and a primary bond. And a resin having an alicyclic structure and the like, and an additive such as a particle or the like, which is formed into a plate shape, a film, a sheet shape, a fiber shape, or a cloth shape. Further, in a range that does not impair the effects of the present invention, a resin layer containing a configuration or a particle having a pattern shape such as a rhombus or a hemisphere may be provided on either or both sides of the surface, and may have a permeation. The layer of the polarization-separating function of light is not particularly limited, but it is preferable to use a diamond-shaped optical member in order to obtain a higher brightness and a tube spot suppressing function in a balanced manner. As such an optical member, specifically, it can be listed in the series - 1315, 2010, 175, such as the Acrimex (registered trademark) RM series (manufactured by Sumitomo Chemical Co., Ltd.), Clarex (registered trademark) DR series (the Japanese resin industry) (Platform), polycarbonate-based resin light diffusing plate, Panlite (registered trademark) series (made by Teijin Chemical Co., Ltd.), polystyrene resin light diffusing plate (lighting)

It is a Zeonor diffusion plate series (manufactured by Optes) manufactured by Unitech (manufactured by Unitech), an alicyclic resin-based light-diffusing sheet, and the like, but is not particularly limited thereto. In the direct type backlight device of the present invention, (iii) the rhombic lens has a plurality of convex shapes extending in a single direction on a surface opposite to the source side of the linear light I, and the plurality of convex shapes have parallel length directions. And the longitudinal direction of the plurality of convex shapes is parallel to the longitudinal direction of the plurality of linear light sources. If such a convex shape is not formed, even if the direct type backlight device satisfies the conditions of (i), (ii), (iv), and (v), the tube spot cannot be suppressed. Here, the convex shape may be Any shape, as viewed from a vertical cross section perpendicular to the longitudinal direction of the convex shape, may be, for example, a semicircular (or reversed shape) of a lenticular lens, a sinusoidal shape, a substantially elliptical shape, and an acute angle. · The general triangular shape of the apex angle of the straight corner (a second-sided triangle or a non-digonal triangle), or any of the angles of an acute angle, an obtuse angle, or a right angle (a square, a rectangle, a trapezoid, and a polygon other than this) The apex portion of the substantially triangular shape is a random shape in which a rounded shape, a waveform, a shape, or a size are irregularly arranged, but the shape is not particularly limited thereto, and a plurality of such shapes may be used. Combine. Further, these convex shapes are provided so as to be laid without a gap on the surface of the sheet, that is, without a flat portion, and may be provided with regular or irregular intervals, without -14- 201015175 Special limited. The method of providing such a convex shape is not particularly limited. For example, a method of forming a resin which is ultraviolet-cured or thermosetting on a base sheet, molding it with a mold or the like, and ejecting the melted resin can be suitably selected. Molding method, embossing method, and the like. The convex shape is preferably a substantially triangular shape having a vertex angle of a right angle. Specific examples thereof include a vikuiti BEF series (manufactured by 3M Company) or a mirror film HGL series (manufactured by EFUN TECHNOLOGY CO., Ltd.). Further, the material of the base material sheet for the convex shape is provided, and examples thereof include polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, and polybutylene terephthalate. a polyester resin such as a diformate, a cyclohexanedimethanol copolyester resin, an isophthalic acid copolyester resin, a spirodiol copolyester resin, or a mercapto copolyester resin, in a primary bond and/or The side bond has a resin having an alicyclic structure, a polyolefin resin such as polyethylene, polypropylene, polymethylpentene or an alicyclic olefin copolymer resin, or a propylene Q acid resin such as polymethyl methacrylate or the like. A thermoplastic resin such as carbonate, polystyrene, polyamine, polyether, polyester decylamine, polyether ester, polyvinyl chloride, or a copolymer thereof as a component, or a mixture of such resins. Among them, in terms of mechanical strength, heat resistance, dimensional stability, copolymers with other components based on biaxially stretched polyethylene terephthalate, polyethylene naphthalate or the like A polyester resin such as a mixture or the like is preferable, but is not limited thereto. Further, even if the convex shape is provided, if the longitudinal direction of the convex shape is not parallel to the longitudinal direction of the linear light source of -15-201015175, even if the (〇, (ii), (iv), (v) is satisfied Under the condition of the direct type backlight device, the tube spot cannot be suppressed. Here, the longitudinal direction of the convex shape is not required to be completely parallel with the longitudinal direction of the linear light source, as long as the longitudinal direction of the convex shape and the longitudinal direction of the linear light source are When the acute angle of the configuration is 10° or less, the suppression effect of the tube spot can be found. The direct type backlight device of the present invention requires (iv) according to JIS K 7 105 (1 98 1st), the surface of the reflective material on the linear light source side. The measured 60° gloss is 5 or less. If it is greater than 60° gloss, even if the direct type backlight device satisfies the conditions of (i), (ii), ❹ (iv), (v), the tube cannot be suppressed. Further, it is preferably 4 or less with a gloss of 60°, and more preferably 3 or less. The gloss of the present invention is a digital angular gloss meter (UGV-4D) using the SUGA test mechanism, and according to JIS K7105 (1981) ), measured in the following steps, to shoot the angle and receive light Adjusted to 60 degrees, the aperture is adjusted so that the light source side becomes 0.75±0.25° in the incident plane, 0.75±0.25° in the vertical plane, and the light receiving side becomes 4.4±0.Γ in the incident plane and 11.7±0.2° in the vertical plane. In the mode, 0 is used to set the gap attached to the machine. Secondly, the standard correction is performed using the black box attached to the machine and the primary reference surface (black glass). Then, a sample of 10 cm square is cut out from each reflective material and set on the measuring device to The sample pressing member to which the black flance cloth was attached was not pressed thereon, and the sample was pressed against the black flannel. Five samples were measured for each of the reflecting materials, and the average enthalpy was taken as 60° gloss. The material of the reflective material is not particularly limited as long as it has a 60° gloss of 5 or less. For example, a metal or alloy plate may be used, and a metal layer or a white layer may be provided on the substrate. A non-woven fibrous material is formed into a sheet, and is formed into a white film or sheet containing incompatible organic or inorganic particles in the resin, and contains a plurality of bubbles in the resin. It is a white film or sheet, etc. Among these, the ease of adjustment of gloss, the uniform reflection performance of a light source with good color reproducibility like LED, the brightness when incorporated in a direct type backlight device, and the like In addition, it is preferable that a white film or a sheet containing a plurality of bubbles in the inside of the resin is preferable. As a method of containing bubbles inside, for example, a method of generating bubbles in the interior of the resin and containing the resin incompatible with the resin may be mentioned. The organic or inorganic particles are formed by a method such as stretching to form bubbles around the particles, etc. In particular, the reflective material of the present invention has a higher reflectance of visible light, and therefore, a white film containing bubbles inside is used. Preferably. The white film is not limited, but for example, a porous unstretched or biaxially stretched polypropylene film, a porous unstretched or extended polyethylene terephthalate film is preferably used. [0034] to [0057] of JP-A-H08-262208, JP-A-2002-90515, [0007] to [0018], and JP-A-2002-1-3 [0008]~ [〇〇34] of the publication No. 8 1 50 and the like are disclosed in detail. Among them, the porous white biaxially-oriented polyethylene terephthalate film disclosed in Japanese Laid-Open Patent Publication No. 2002-90515, or from the viewpoint of heat resistance and reflectance, and polyethylene naphthalate The porous white biaxially-oriented polyethylene terephthalate film in which the ester is mixed and/or copolymerized is more suitable as a white film of the reflective material of the present invention for the reasons described above. -17- 201015175 The composition of such a white film can be appropriately selected depending on the use or characteristics required for use, and is not particularly limited, but a single layer and/or a composite film of two or more layers having at least one layer or more It is preferable that at least one or more of the bubbles, the inorganic particles, and the organic particles are contained in at least one layer or more. As an example of the single layer structure (= layer), for example, a single layer of a white film of the layer A may be used, and the layer A may contain any one or more of bubbles, inorganic particles, and organic particles. Further, as an example of the two-layer structure, for example, a white film composed of two layers of the A layer/B layer of the B layer is laminated on the layer A, and at least one of the layers A and B contains bubbles. Any one or more of inorganic particles and organic particles. Further, as an example of the three-layer structure, as described above, a white film having a three-layered three-layer structure in which an A layer/B layer/A layer or an A layer/B layer/C layer is laminated may be used, and in each layer. At least one layer contains at least one of bubbles, inorganic particles, and organic particles. In the case of a three-layer structure, it is preferable that Q is a layer containing bubbles in order from the viewpoint of productivity. The number average particle diameter of the inorganic particles and/or organic particles contained in the white film is preferably 0.3 to 2.0/zm. As the organic particles, a resin mainly composed of a crosslinked polymer component having a high melting point is preferable, and examples thereof include a polyester resin, a polyamide resin particle such as benzoguanamine, a urethane resin, an acrylic resin, and a Acrylic resin, polyamide resin, polyethylene resin, polypropylene resin, polyvinyl chloride resin, chlorinated polyvinyl chloride resin, polystyrene resin, polyvinyl acetate resin, fluorine tree-18 - 201015175 Resin particles, hollow particles, and the like. These resins may be used singly or in combination of two or more kinds of copolymers or mixtures. In terms of light resistance of the white film, it is preferred to contain an ultraviolet absorber and a light stabilizer in the spherical particles contained therein. Further, as the inorganic particles, calcium carbonate, magnesium carbonate, zinc carbonate, titanium oxide, zinc oxide, cerium oxide, magnesium oxide, barium sulfate, zinc sulfide, calcium phosphate, vermiculite, alumina, mica, mica titanium, or the like can be used. Talc, clay, kaolin, lithium fluoride, calcium fluoride, etc. As an example of such a white film, the white ray film which is a single layer is exemplified by Lumirror (registered trademark) E20 (manufactured by Toray Industries, Inc.), SY64' SY7 0 (SKC^) > White Ref Star (i£W^^) WS-220 (H-Jing Chemical Co., Ltd.), etc., as a two-layer white film, a Tetoron (registered trademark) film UXZ1, UXSP (manufactured by Teijin DuPont Films Co., Ltd.), etc. The white film of the three-layer structure is exemplified by LUmirr〇r (registered trademark) E60L, E6SL, E6SR, E6SQ, E6Z, E6Z2, E80, E80A, E80B (manufactured by Toray Co., Ltd.), Tetoron (registered trademark) film UX. UXH (manufactured by Teijin Q DuPont Filmes Co., Ltd.) and PL230 (Mitsubishi Resin Co., Ltd.). In addition, examples of the white sheet having a configuration other than the above-described configuration include Optilon ACR3000, ACR3020 (manufactured by DuPont Co., Ltd.), and MCPET (registered trademark) (manufactured by Furukawa Electric Co., Ltd.). If (iv) according to JIS K 7 105 (198 1), the 60° gloss measured on the side facing the linear light source side is 5 or less, the direct type backlight used in the present invention can be used as a single body. When the glossiness of the reflective material of the apparatus is more than 5, the glossiness can be adjusted to 5 or less by the method described later. -19- 201015175 The reflective material of the present invention is 60 on the substrate itself of the film or sheet. When the gloss is more than 5, 60 is required by applying various processing to the substrate. The gloss is adjusted to be 5 or less and then used as a reflective material. The processing method is not particularly limited, and for example, a method of forming a resin which is cured by ultraviolet curing or thermosetting, followed by molding with a mold or the like, a method of embossing, a method of sandblasting, a method of laminating, a method of coating, and a coating method can be suitably selected. Various methods, such as a method of peeling the surface layer in the structure of two or more layers. The reflective material of the present invention is preferably a resin layer having particles on the surface of the linear light source side. By containing particles, it is easy to put 60. The glossiness is adjusted to 5 or less to further suppress tube spots. The shape of the particles is not limited to one form 'for example, a flat shape such as a star shape, a leaf shape, or a disk shape, such as a rhombus, a square, a needle, a gold syrup, an amorphous non-spherical shape, and a spherical shape (not It must be only a true spherical shape, and the cross-sectional shape of the particles is surrounded by a curved surface such as a circular shape, an elliptical shape, a substantially circular shape, or a substantially elliptical shape, etc., and the particles of such shapes may be porous or non-porous. Hollow matter, no particular limitation. Further, if the particles are contained, 60 can be used. The glossiness is adjusted to 5 or less, and may be any of an organic compound, an inorganic substance, and an inorganic compound, and is not limited to one. A method of providing a resin layer containing particles on a surface of the reflective material on the linear light source side is, for example, gravure coating, roll coating, spin coating, reverse coating, rod coating, screen printing, blade coating, or the like. Various coating methods such as air knife coating and dip coating apply a coating liquid containing particles and a binder resin to a reflective material (on-line coating) or from -20 to 201015175 (off-line coating) to completion of crystal alignment. The method of forming a coating layer on the reflective material, or laminating a film or a sheet containing particles, or the like, is not particularly limited. Further, the surface on which the layer containing the particles is provided is not particularly limited, and the reflective material is a two-layer structure of A layer/B layer, A layer/B layer/A layer or A layer/B layer/C layer 3 In the case of a layer structure, it may be provided on either side. Examples of the reflective material having a layer containing such particles include Lumirror (registered trademark) E6QD, E6ZD (manufactured by Toray Industries, Ltd.), DR240T, 〇 RE240.T (manufactured by ETERNAL CHEMICAL CO., Ltd.), and the like. When used in a direct type backlight device, the reflective material of the present invention has a particle which is contained in a reflective material or a resin layer due to light emitted from a light source, particularly a cold cathode tube or the like, particularly ultraviolet rays. Deterioration (for example, optical deterioration such as yellowing or decomposition degradation of low molecular weight, etc.). Therefore, in the resin forming the resin layer containing the particles provided on the reflecting material, it is preferable to contain the ultraviolet absorber 0 and/or the light stabilizer insofar as the effect of the present invention is not impaired. In the present invention, the content of the particles in the resin layer of the reflective material is not particularly limited as long as the glossiness of 60° is 5 or less, and depending on the type and productivity of the reflective material or the particles, Therefore, it is not limited to a certain content rate, but the content of the suppression effect of the tube spot and the balance of the brightness can be selected. In view of glossiness and productivity, it is preferably 0.2% by weight or more and 75% by weight or less based on the total amount of the resin. When the content of the particles is less than 0.2% by weight, there is a case where the 60° gloss cannot be 5 or less -21-.201015175. On the other hand, when it exceeds 75% by weight, the productivity is extremely deteriorated. Therefore, it is preferable to control it to 75% by weight or less. Further, it is preferably 50% by weight or more and 75% by weight or less, and more preferably 65% by weight or more and 75% by weight or less. In the present invention, the thickness of the resin-containing resin layer provided in the reflective material is determined depending on the type and content of the reflective material or the particles, but it is preferably 5 to 50 cm. When the thickness of the resin layer is less than 0.05 //m, there is a case where the suppression effect of the tube spot is impaired. Conversely, when the thickness exceeds 50 #m, it is not desirable in terms of economy. In addition, the thickness of the resin layer herein means the total thickness of the resin layer containing particles, and when it has one or more layers, it is determined by the thickness of the entire resin layer, that is, the thickness of the entire resin layer of the complex tree layer. The direct type backlight device of the present invention requires (v) a distance L between the centers of adjacent linear light sources among the plurality of linear light sources, and the optical from the center of the linear light source to the closest to the linear light source When the distance from the element is Η, the 0 that satisfies the following equation (1) is 45°$ 0 $70°. ❹ Θ =tan '((L/2)/H) The equation (1) is configured to satisfy the equation (1) where 0 is 5 (TS0S7O° is preferred, especially configured to satisfy the equation (1) 0 is 60° S 0 $70° is particularly preferable. Here, the case where 0 is increased means that the distance between the linear light source and the optical member closest to the linear light source is minimized, or the distance between the linear light sources is increased. In the case of the direct type backlight device in which the number of the fluorescent tubes to be mounted is reduced for the purpose of reducing the power consumption from the viewpoint of environmental protection, the latter has a tendency to be the latter. In the present invention, -22-201015175 surprisingly, in the case where the increase of the numerical formula (1) is satisfied, the suppression effect of the tube spot can be further increased, that is, the number of the fluorescent tubes is reduced or reduced. In the direct type backlight device, a larger tube spot suppression effect can be exerted. Further, a direct type backlight device in which a linear light source is arranged to satisfy a numerical formula (1) of 0 to 45°$0$7 〇° and satisfy a size of 10 mm is used. Preferably, the effect of suppressing the tube spot is further increased. The direct type backlight device of the present invention is only The reflective material, the plurality of linear light sources, and the optical element group are sequentially disposed, and the direct type backlight device satisfies the following conditions (i) to (V), and may include haze in the optical member group. 99.0% or less of an optical member, a rhombohedral lens, or an optical member of a film or sheet other than the above (hereinafter referred to as another optical sheet). As a configuration of the optical member group, the haze is sequentially formed from the linear light source side. 99.0% or less of optical members/rhombus lenses/other optical sheets", "optical members with a haze of 99.0% or less, other optical sheets/red lenses", and "optical members with a haze of 99.0% or less" For example, the other optical sheets include, for example, a layer containing particles in a substrate or a hemispherical protrusion, thereby improving light diffusibility or brightness. a functional film or sheet, or a film or sheet having a polarizing separation function by controlling the polarization characteristics of transmitted light, but is not limited thereto. As such a film or sheet member, specifically, for example, Column Light-Upl00GM2, Light-UplOOGM3 (manufactured by KIMOTO Co., Ltd.), UTE I, UTE Π (manufactured by MN Tech Co., Ltd.), vikuiti DBEF series (manufactured by 3M Company), etc., but are not limited thereto. - 201015175 The optical member, the rhombohedron, the reflective material, and the resin layer containing the particles laminated on the reflective material in the present invention can be added to the optical layer having a haze of 99.0% or less in the range of the present invention. Various additives. The additive may use, for example, organic and/or inorganic particles, a luminescent material represented by a fluorescent whitening agent, a crosslinking agent, a flame retardant, a flame retardant, a heat resistant stabilizer, an oxidation resistant stabilizer, Organic slip agents, antistatic agents, nucleating agents, dyes, hydrating agents, dispersing agents, and coupling agents. (Example) Hereinafter, a measurement method and an evaluation method are shown. (1) Haze of the component 浊 A haze meter (haze meter) NDH-2000 manufactured by Nippon Denshoku Industries Co., Ltd. was used, and it was measured in accordance with JIS K 7136 (2000). The sample was cut into 8 cm squares with the member (except the reflective material) disposed closest to the linear light source of the direct type backlight. When a plurality of members are bonded by an adhesive or the like, the components are immersed in an organic solvent for a sufficient period of time, and the members are peeled off without scratching the surface, and the dryer is sufficiently dried after wiping off the adhesive or the like. . When a sample of a member disposed closest to the linear light source after being taken out is placed in the direct type backlight device as a surface on the linear light source side, a parallel angle (within an error of ±2°) is incident on the parallel light beam. It is measured after setting. Five samples were measured for each of the four corners and the central portion of each sample, and the average enthalpy at 25 points was taken as the haze. (2) The shape of the convex shape or the convex shape of the sheet - 24 - 201015175 The rotary microtome made by the Japanese Slicer Research Institute, with a blade inclination angle of 3°, perpendicular to the plane of the sheet And the sample is cut as perpendicular as possible to the length direction of the convex shape. Then, using the scanning electron microscope ABT-32 manufactured by TOPCON Co., Ltd., the obtained cross-section of the sheet was observed so that the convex shape was reflected at a viewing magnification of 2500 times in the field of view, and the contrast of the image was appropriately adjusted to observe the shape of the convex shape. . Similarly, in the longitudinal direction of the convex shape, the total of the five portions was observed at intervals of 2 to 5 cm, and it was observed whether or not the plurality of convex shapes extended substantially in one direction. In the case where the shape of the projection was confirmed by the flawless method, the observation was also observed at a magnification of 5000 times, and even when the observation magnification was not observed at 5,000 times, the observation magnification was observed at 1,000,000 times. When it can be confirmed at any observation magnification that a plurality of convex shapes extend substantially in one direction, it is judged that it has a convex shape, and it is impossible to confirm that the plurality of convex shapes extend substantially in one direction at any observation magnification. In the case, it is judged that there is no convex shape. (3) 60° gloss of the reflective material 数 The digital angular angle gloss meter (UGV-4D) using the SUGA test mechanism was used and measured according to the following procedure according to IISK7105 (1981). The entrance angle and the acceptance angle are adjusted to 60 degrees, and the aperture is adjusted so that the light source side becomes 0.75±0.25° in the incident plane, 0.75±0.25° in the vertical plane, and the light receiving side becomes 4.4±0.1° in the incident plane, vertical. Set the gap attached to the machine by 11.7±0.2° in the plane. Secondly, the standard correction is made using the black box attached to the machine and the primary reference surface (black glass). Then, a sample of l〇cm square is cut out from each of the reflective materials, and set on the measuring device so as to be pressed by the sample pressing member with the black fluff cloth on the back without the bending of the sample -25-201015175 Above it. Five samples were measured for each of the reflective materials, and the average enthalpy was taken as 60° gloss. (4) The resin layer containing the particles of the reflective material or the particle shape is a rotary microtome made by a Japanese microtome, and the sample is cut in a direction perpendicular to the plane of the reflecting material with a blade inclination angle of 3°. Broken. Then, using the scanning electron microscope ABT-32 manufactured by TOPCON Co., Ltd., the cross section of the obtained reflective material was observed so that the resin layer was reflected at a viewing magnification of 2500 times in the field of view, and the contrast of the image was appropriately adjusted to observe The resin layer on the side of the wireless light source, the presence or absence of particles, and the shape of the particles. When it was not possible to determine the presence or absence of the resin layer, the presence or absence of particles, and the shape of the particles, the observation was carried out at an observation magnification of 5000 times, and even when the observation magnification was 5,000 times, the observation was performed at an observation magnification of 10,000 times. When the resin layer or/and the particles were confirmed at any observation magnification, it was judged that the resin layer or/and the particles were present, and when the resin layer Φ or/and the particles could not be confirmed at any of the observation magnifications, it was judged as none. Resin layer or / and particles. (5) Brightness and tube spot of the direct type backlight device After the various members are placed in a direct type backlight (to be used in two types) to be described later, the fluorescent lamp is turned on. One hour after lighting, a two-dimensional luminance meter CA-2000 manufactured by Konicaminolta Sensing Co., Ltd. is used, as shown in Fig. 1, from the front direction of the direct type backlight device, that is, the direction perpendicular to the direct type backlight device. To measure brightness and tube spots. The measurement range is in the central portion of the direct type backlight device, and is 280-201015175 20 cm in length in the direction parallel to the fluorescent tube to be the distance between the centers of the fluorescent tubes adjacent to the direction perpendicular to the fluorescent tube. The 7-fold distance is horizontally long, and the vertical and horizontal squares are placed in the longitudinal direction of the seven fluorescent tubes. The brightness and uniformity of this measurement range are then determined. The brightness was evaluated as the average brightness of the range. Tube plaques were obtained in the following manner. As shown in Fig. 2, nine lines (the broken line 1 0) of the longitudinal direction of the range divided by 10 at intervals of 2 cm were taken out, and each line was used as a measurement line for the tube spot. When the brightness is measured along the measurement line of each of the tube spots, a plurality of peaks having a higher brightness than the surrounding area and a plurality of valleys having a lower brightness than the surrounding area are observed. For one of the tube spot measurement lines, the average 値 of 5 points from the order of high brightness is Lmax, the average 値 of 5 points from the order of low brightness is Lmin, and the average 値 of Lmax and Lmin is Lave The degree of uniformity of the measurement line of the tube spot is calculated using the following formula (2). The average 値 of the uniformity of the nine measurement lines of the tube spot was used as the tube spot. Moreover, the larger the average 値, the stronger the tube spot, and the smaller the tube plaque, the weaker the tube spot. The average degree of the measurement line of one of the tube spots (%) = (Lmax - Lmin) / LavexlOO (2) 〇 The configuration of the apparatus used in the examples and the comparative examples is shown below. (1) Device 1 Size: 32 吋 (725mmx413mm, diagonal 834mm) Diameter of the fluorescent tube: 3mm Number of fluorescent tubes: Distance between centers of 19 fluorescent tubes L: 20.4mm Center of the fluorescent tube and closest Distance of the optical member H: 6.5mm Distance between the center of the fluorescent tube and the reflective material: 3.0mm -27- 201015175 θ : 57.5〇 ( Θ =tan-1((L/2)/H)) (2) Device 2 Dimensions: 20 吋 (424mm x 331mm, diagonal 537mm) Diameter of the fluorescent tube: 4mm Number of fluorescent tubes: Distance between the centers of 10 fluorescent tubes L: 30mm Distance between the center of the fluorescent tube and the closest optical member H : 13 mm distance between the center of the fluorescent tube and the reflector: 6.0mm ❹ Θ - 49. Γ ( 0 = tan'1((L/2)/H)) (3) Device 3 Size: 32 吋 (725mmx413mm, right Angle 8 34mm) Diameter of the camping tube: 3mm Number of fluorescent tubes: Distance between the centers of 10 fluorescent tubes L: 40.8mm Distance between the center of the fluorescent tube and the closest optical member H: 9mm 〇 Fluorescent tube Distance between center and reflector: 3.0mm Θ 66.2° ( Θ =tan '((L/2)/H)) (4) Device 4 Size: 20 吋 (424mmx331mm, diagonal 537mm) Diameter of fluorescent tube: 4mm Number of fluorescent tubes: 10 fluorescent tubes Inter-language distance L: 30mm Distance between the center of the fluorescent tube and the nearest optical member H: 16mm -28- 201015175 Distance between the center of the fluorescent tube and the reflective material: 6.0mm Θ : 41.4β( Θ =tan '((L/ 2)/H)) (5) Device 5 Size: 32 吋 (725mmx413mm, diagonal 834mm) Diameter of the fluorescent tube: 3mm Number of fluorescent tubes: Distance between the centers of 10 fluorescent tubes L: 40.8mm Distance between the center of the light pipe and the nearest optical member H: 6.5mm Distance between the center of the fluorescent tube and the reflector: 3.0mm Θ : 72.3β( Θ =tan-'((L/2)/H)) The members A to D used in the respective examples and comparative examples, and the order of lamination of the members. A: The optical member (*) closest to the fluorescent tube has a surface having a convex shape, and the opposite surface of the surface is disposed toward the side of the fluorescent tube. Q B: Diamond lens (the positional relationship between the longitudinal direction of the convex shape on the diamond lens and the linear direction of the fluorescent tube) (*) The opposite surface of the surface on which the convex shape is provided is disposed toward the side of the fluorescent tube. C: When the optical sheet (*) other than A or B has a concave-convex surface, the opposite surface of the surface is placed toward the side of the fluorescent tube. D: Reflective material -29- 201015175 (*) The glossiness shown in Table 1-1 is the surface facing the side of the fluorescent tube. Lamination sequence: The portion other than the D (reflective material) is described. Α/Β/C means that layers are stacked in the order of A, B, and C from the side of the fluorescent tube. (First Embodiment) The configurations of the following A to D were evaluated by the apparatuses 1, 2 and 3. A : Clarex (registered trademark) DR-m CA DR-80C (manufactured by Nitto Resin Co., Ltd.) B : vikuiti BEFIE 90/50T (manufactured by 3M Company; convex shape: a triangle whose apex angle is a right angle; a convex shape Pitch: 50 from m) (set in parallel direction) C: no D: Lumirror (registered trademark) E6QD (manufactured by Toray Industries, Inc.; thickness: 188 β m) Lamination sequence: A/B (Second embodiment) The devices 1, 2, and 3 evaluated the configurations of the following A to D. A : Sumipex (registered trademark) RM804S (Sumitomo Chemical Co., Ltd.) B : vikuiti BEFIE 90/50T (made by 3M company; convex shape: triangle with a right angle at the right angle; distance between convex shapes · 50# m) (Set in parallel direction) C : No D : Lumirror (registered trademark) E6QD (manufactured by Toray Industries, Inc.; thickness: 188 β m) -30- 201015175 Sequence of lamination: A/B (3rd embodiment) First, 32 吋 LCD TV (manufactured by Hitachi, Ltd., 〇〇〇 〇〇〇 注册 UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT UT A resin plate having a thickness of 2 mm which is disposed in parallel with the linear direction of the fluorescent tube in the longitudinal direction of the shape. Regarding this resin sheet, when the light is incident from the side of the fluorescent tube at the time of mounting before the decomposition, the haze 〗 according to 〖IS K 7 1 36 (2000) is 98.3%, and then the incident surface is rotated from this state. At 90°, and the same measurement was carried out, the haze was 98.1%. The average 値98.2% was taken as the haze of the resin sheet. Next, the resin sheet is cut into a size that can be placed on the packages 1 to 5 (hereinafter, simply referred to as a concave-convex pattern resin sheet), and the following configurations of Α to D are performed by the devices 1, 2, and 3. Evaluation. A: a concave-convex resin plate (the longitudinal direction of the convex shape is set in a direction parallel to the linear direction of the fluorescent tube) φ B : vikuiti BEFffl; 90/50T (made by 3M company; convex shape: a triangle having a right-angled corner) ; the distance between the convex shapes: 50 mm) (set in the parallel direction) C: no D: Lumirror (registered trademark) E6QD (made by Toray (stock); thickness 188 β m) Stacking order: A/B (4th EXAMPLES -31-201015175 The following structures A to D were evaluated by the apparatuses 1, 2 and 3. A : Clarex (registered trademark) DR-ΠΙ C - AD R-9 0C (made by Nitto Resin Co., Ltd.) B : vikuiti BEF melon 90/50T (made by 3M company; convex shape: triangle with a right angle at right angles; The distance between the convex shapes: 50 # m) (set in the parallel direction) C : No D : Lumirror (registered trademark) E6QD (made by Toray (share); thickness 188 〇β m) Stacking order: A/B (No. 5 EXAMPLES The configurations of the following A to D were evaluated by the apparatuses 1, 2 and 3. A: concave-convex resin plate (the length direction of the convex shape is set in a direction parallel to the linear direction of the fluorescent tube) B : vikuiti BEF melon 90/5 0T (made by 3M company; convex shape: top angle ❺ is right angle Triangle; convex shape distance: 50/zm) (disposed in parallel direction) C: no D: reflective material made by the following method A (method A) Preparing HALS Hybrid (registered trademark) Uv-G720T (Acrylic copolymer, 40% solution, refractive index 1.56; manufactured by Nippon Shokubai Co., Ltd.): lO.Og, ethyl acetate: 7. 〇g, Techpolymers (Registry-32-201015175) TRX05S ( Acrylic spherical particles, refractive index 1.49; manufactured by Sekisui Chemicals Co., Ltd.): 9.2 g of a coating liquid which was added while stirring. On the side of a white film (manufactured by Toray Industries, Inc., Lumirror (registered trademark) E6QD) composed of a porous biaxially-oriented polyethylene terephthalate of 1 88, the solution was coated with a #16 coated rod. The coating layer was set at 120 ° C for 1 minute. The gloss of the reflective material is 5. The stacking order: A/B. (Sixth embodiment) ❹ The following configurations of A to D were evaluated by the apparatuses 1, 2 and 3. A: a concave-convex resin plate (the longitudinal direction of the convex shape is set in a direction parallel to the linear direction of the fluorescent tube) B : vikuiti BEFID 90/5 0T (made by 3M company; convex shape: a triangle whose apex angle is a right angle; The distance between the convex shapes is: 50//m) (set in the parallel direction) C: Light-UplOOGM2 (made by KIM〇TO); the light diffusion sheet with a layer containing particles φ on the surface layer, haze: 95.5% D: Lumirror (registered trademark) E6QD (manufactured by Toray Co., Ltd.; thickness: 188 β m) Lamination sequence: A/B/C (Seventh embodiment) Using the devices 1, 2 and 3, the following A ~! The composition of the evaluation is evaluated. A: concave-convex pattern resin plate (the length direction of the convex shape is set in a direction parallel to the linear direction of the fluorescent tube) -33- 201015175 B : vikuiti BEFDI 90/50T (made by 3M company; convex shape: the top angle is a right angle Triangle; convex shape distance: 50 / / m) (set in parallel direction) C : vikuiti DBEF (made by 3M company; sheet with polarized light separation, haze: 81.5%) D: Lumirror (registered trademark) E6QD (manufactured by Toray Industries, Inc.; thickness: 188 β m) Lamination sequence: A/B/C (Eighth Embodiment) The configurations of the following A to D were evaluated by the apparatuses 1, 2 and 3. A: a concave-convex pattern resin plate (the longitudinal direction of the convex shape is set in a direction parallel to the linear direction of the fluorescent tube) B: vikuiti BEF melon 90/50T (manufactured by 3M Company; convex shape: a triangle whose apex angle is a right angle; The distance between the convex shapes: 50/zm) (set in the parallel direction) Φ C: UTEn (manufactured by MNTech C0., Ltd.; light diffusing sheet with hemispherical protrusions on the surface layer, haze: 89.6%) D: Lumirror ( Registered trademark) E6QD (Dongli Co., Ltd.; thickness: 188 β m) Stacking sequence: A/B/C (Ninth embodiment) Using the devices 1, 2 and 3, the following configurations of A to D are performed. Evaluation. A: embossed resin plate (the length direction of the convex shape is set in a direction parallel to the linear direction of the -34-201015175 fluorescent tube) B : vikuiti BEFffl 90/50T (made by 3M company), convex shape: the apex angle is Right-angled triangle; distance between raised shapes: 50 μm) (set in parallel direction)

Cl: Light-UplOOGM2 (made by KIMOTO); light diffusing sheet with particle-containing layer on the surface layer, haze 95: 95.5%) C2: vikuitiDBEF (made by 3M company; sheet with polarized light separation function, haze: 81.5%) D: Lumirror (registered trademark) E6QD (manufactured by Toray Industries, Inc.; thickness: 188 β m) Lamination sequence: A/C1/B/C2 (10th embodiment) Using the devices 1, 2 and 3, The composition of the following A to D was evaluated. A: a concave-convex pattern resin plate (the longitudinal direction of the convex shape is set in a direction parallel to the linear direction of the fluorescent tube) φ B : vikuiti BEFm 90/50T (made by 3M company: convex shape: a triangle whose apex angle is a right angle; The distance between the convex shapes: 50/zm) (set in the parallel direction) C: Light-UplOOGM2 (made by KIMOTO); the light diffusion sheet with a particle-containing layer on the surface layer, haze: 95.5%) D: Lumirror (registered trademark) E6QD (Dongli (share) system; thickness 188 β m)

Lamination sequence: A/C/B/C/C-35-201015175 (Eleventh embodiment) The configurations of the following A to D were evaluated by the devices 1, 2 and 3. A: a concave-convex pattern resin plate (the longitudinal direction of the convex shape is set in a direction parallel to the linear direction of the fluorescent tube) B : vikuiti BEFm 90/5 0T (made by 3M company; convex shape: a triangle whose apex angle is a right angle; The distance between the convex shapes is: 50 vm) (set in the parallel direction) C: Light-UplOOGM2 (made by KIMOTO: a light-diffusing sheet with a particle-containing layer on the surface layer, haze: 95.5%) D: by The reflective material prepared by the following Process B (Process B) was prepared by HALS Hybrid (registered trademark) Uv-G720T (acrylic copolymer, 40% solution, refractive index 1.56; Nippon Catalyst). lO.Og, ethyl acetate: 7.0 g, Techpolymers (registered trademark) TRX05S (acrylic spherical particles, refractive index 1.49; synthetic product φ industrial (manufactured by the company): 9.2 g of coating liquid formed by stirring . On the side of a white film (manufactured by Toray Industries, Inc., Lumirror (registered trademark) E80A) composed of a porous biaxially-oriented polyethylene terephthalate of 188, the solution was coated with a #24-coated rod. The coating layer was set at 120 ° C for 1 minute. The gloss of the reflective material is 3. (First Comparative Example) The configurations of the following A to D were evaluated by the apparatuses 1, 2 and 3. A : Clarex (registered trademark) DR-m CA DR-90C (Nitto Resin-36-201015175 (in stock) system) B : vikuiti BEF ΠΙ 90/50T (made by 3M company; convex shape: the top angle is right angle Triangle; convex shape distance: 50/zm) (set in parallel direction) C: no D: Lumirror (registered trademark) E6Sv (made by Toray (share); thickness 225 β m) (2nd comparative example) ❹ The configurations of the following A to D were evaluated by the devices 1, 2 and 3. A : Clarex (registered trademark) DR-ΠΙ CA DR-90C (made by Nitto Resin Co., Ltd.) B : vikuiti BEFH 90/5 0T (made by 3M company; convex shape: triangular shape with right angle; convex shape Distance: 50 β m) (disposed in parallel direction) C : No φ D: Reflective material prepared by the following method C (Process C) Preparation of HALS Hybrid (registered trademark) Uv-G720T (acrylic copolymerization) Solution, concentration 40% solution, refractive index 1.56; Japan catalyst (manufactured by the company): lO.Og, acetic acid ethyl acetate: 24.1g, Techpolymers (registered trademark) TRX05S (acrylic spherical particles, refractive index 1.49; Chemical product manufacturing system (manufactured by the company): 4.0 g of a coating liquid formed by adding while stirring. On the side of a white film (made by Toray Co., Ltd., Lumirror (registered trademark) E6SR) consisting of a porous biaxially-oriented polyethylene terephthalate of 1 88/zm, using #16 This solution was applied by a coating bar, and a coating layer was set at 120 ° C for 1 minute. The gloss of the reflective material is 7. (Third Comparative Example) The configurations of the following A to D were evaluated by the apparatuses 1, 2 and 3. A: a concave-convex resin plate (the longitudinal direction of the convex shape is set in a direction parallel to the linear direction of the fluorescent tube) B: no spring C ··no D: Lumirror (registered trademark) E6QD (Toray) Thickness: 188 β m) (Fourth Comparative Example) The following configurations of A to D were evaluated by the apparatuses 1, 2 and 3. A: a concave-convex resin plate (the longitudinal direction of the convex shape is set in a direction parallel to the linear direction of the fluorescent tube) 0 B : vikuiti BEFDI 90/50T (made by 3M company; convex shape: a triangle whose apex angle is a right angle: The distance between the convex shapes: 50/zm) (set in the orthogonal direction) C: no D: Lumirror (registered trademark) E6QD (manufactured by Toray Industries, Ltd.; thickness: 188 β m) (5th comparative example) The devices 1, 2, and 3 evaluated the configurations of the following A to D. -38- 201015175 A : Clarex (registered trademark) DR-Ht C - ADR - 7 0 C (made by Nitto Resin Co., Ltd.) B : vikuiti BEFIE 90/5 0T (made by 3M company; convex shape: apex angle is Right-angled triangle; convex shape distance: 50 μm) (set in parallel direction) C : UTEH (manufactured by MNTech Co., Ltd.; light diffusion sheet with hemispherical protrusions on the surface layer, haze: 89.6%) D : Lumirror (registered trademark) E6QD (manufactured by Toray Industries, Inc.; thickness: 188 ❹ β m) Stacking order: A/C/B (sixth comparative example) With the devices 1, 2 and 3, the following A~ The composition of D was evaluated. A : Clarex (registered trademark) DR-m CA DR-70C (made by Nitto Resin Co., Ltd.) B : vikuiti BEFm 90/50T (made by 3M company; convex shape: triangular shape with apex angle φ is a right angle; convex shape Distance between: 50 μ m) (set in parallel direction)

Cl : Light-UplOOGM2 (made by KIMOTO Co., Ltd.; light diffusion sheet with particle-containing layer on the surface layer, haze 95: 95.5%) C2 : vikuiti DBEF (made by 3M company; sheet with polarized light separation function, haze 値:8 1 · 5 %) D: Lumirror (registered trademark) E6QD (manufactured by Toray Co., Ltd.; thickness: 188 β m) -39- 201015175 Sequence of lamination: A/C1/B/C2 (seventh comparative example) The devices 4 and 5 evaluated the configurations of the following A to D. A : Clarex (registered trademark) DR·Gua C - ADR - 7 0 C (made by Nitto Resin Co., Ltd.) B : vikuiti BEFM 90/50T (made by 3M company; convex shape: triangle with a right angle at right angle; convex Distance between shapes: 50// m) (set in parallel direction) ❹

Cl: Light-UplOOGM2 (KIM〇TO (share) system; light diffusion sheet with particle-containing layer on the surface layer, haze 95: 95.5%) C2: vikuitiDBEF (made by 3M company; sheet and haze with polarized light separation function)値: 81.5%) D: Lumirror (registered trademark) E6QD (manufactured by Toray Co., Ltd.; thickness: 188 β m) Lamination sequence: A/C1/B/C2 φ (8th comparative example) Using the devices 4 and 5 The evaluation of the following A to D is performed. A : Clarex (registered trademark) DR-IE C - ADR - 7 0 C (made by Nitto Resin Co., Ltd.) B : vikuiti BEFDI 90/50T (made by 3M company; convex shape: triangular shape with right angle; convex Distance between shapes: 50 vm) (set in parallel direction)

Cl: Light-UplOOGM2 (manufactured by KIMOTO Co., Ltd.; light diffusion sheet with a layer containing particles -40 - 201015175, haze: 95.5%) C2: vikuitiDBEF (manufactured by 3M Company; sheet with polarized light separation function, Haze 81·81.5%) D: Lumirror (registered trademark) E6QD (manufactured by Toray Industries, Inc.; thickness: 188 β m) Stacking order: A/C 1/B/C2 Table 1-1 to Table 2 below The characteristics of the examples and comparative examples are shown in -2.参 -41 - 201015175 [Table 1-1]

Component configuration of the direct type backlight device © Optical member (*1) (10) Rhombic lens reflector (surface on the side of the fluorescent tube) Stacking order of other optical sheet members is foggy.) Setting direction (*2) (iv) Number of sheets with or without particle-containing layer (*3) First embodiment 98.9 Parallel 4 with or without A/B 2nd embodiment 98.8 Parallel 4 with or without A/B 3rd embodiment 98.2 Parallel 4 with or without A/B 4th embodiment 97.3 Parallel 4 With or without A/B 5th embodiment 98.2 Parallel 5 with Ατι» m A/B ό Example 98.2 TO 4 with 1 A/B/C 7th embodiment 98.2 Parallel 4 with 1 A/B/C 8th implementation Example 98.2 4 Yes 1 A/B/C 9th embodiment 98.2 Parallel 4 2 A/C1/B/C2 10th embodiment 98.2 Parallel 4 3 A/C/B/C/C 11th embodiment 98.2 Parallel 3 Yes 1 A/B/C 1st comparative example 97.3 ψη 30 Yes / m· m A/B 2nd comparative example 98.9 Parallel 7 With or without A/B 3rd comparative example 98.2 JrrT m 4 With or without A 4th comparative example 98.2 Positive Cross 4 with or without A/B 5th comparative example 99.2 parallel 4 with 1 AJC/B 6th comparative example 99.2 parallel 4 with 2 A/C1/B/C2 (*1) A: optical member closest to the fluorescent tube (* 2) B: the protrusion of the lens The relationship between the longitudinal direction of the shape and the straight portion of the fluorescent tube (*3) A/B/C means that the layers are stacked in the order of A, B, and C from the side of the fluorescent tube (except for the reflective material). A: The closest to the fluorescent light. Tube optical member B: diamond lens C: other optical member -42- 201015175 [Table 1-2]

(V) Structure of the direct type backlight device (angle e) Device 1 Device 2 Device 3 (θ=57.5° H=6.5 mm) (0=49.1°, H=13 mm) (0=66.2° 'H=9mm) Average Brightness (cd/m2) Pet (average uniformity) (%) Average brightness (cd/m2) Tube spot (average uniformity) (%) Average brightness (cd/m2) Tube spot (average uniformity) (%) Implementation Example 1 6527 1.67 4914 1.94 3972 1,50 Example 2 6582 1.62 4951 1.88 4002 1.46 Example 3 6526 0.36 4955 0.42 4005 0.32 Example 4 6594 1.98 4974 2.30 4020 1.78 Example 5 6692 0,46 5304 0,53 4287 0.41 Example 6 6215 0.32 4659 0.37 3766 0.29 Example 7 4306 0.28 3083 0.33 2492 0.25 Example 8 6687 0.25 4867 0.29 3934 0.22 Example 9 4318 0.56 2982 0.65 2410 0.50 Example 10 5514 0.63 3817 0.73 3085 0,57 Example 11 6696 0.20 4867 0.23 3934 0.18 Comparative Example 1 6343 2.28 5004 2.65 4045 2.05 Comparative Example 2 6526 2.03 5127 2.36 4144 1.82 Comparative Example 3 4740 25.19 3970 29.26 3209 22.63 Comparative Example 4 6493 8.95 4923 10.40 3979 8.04 Comparative Example 5 6781 2.55 4941 2.96 3994 2.29 Comparative Example 6 4530 2.09 3082 2.43 2491 1. 88 -43- 201015175 [Table 2-1]

Component configuration of the direct type backlight device (ii) member (*1) (iii wide lens reflector (surface on the side of the fluorescent tube) laminated haze of other optical sheet members 値 W setting direction (*2) (iv 洸泽Degree of presence or absence of the particle-containing layer (*3) 7th Comparative Example 98, 2 Parallel 4 λπΤ m A/B 8th Comparative Example 98.2 Parallel 4 1 A/B/C (*1) A: Closest Optical member of the fluorescent tube (* 2) B: The length direction of the convex shape of the diamond lens and the (* 3) A/B/C of the straight portion of the fluorescent tube refer to the A, B from the side of the fluorescent tube. The sequential lamination of C and C (excluding the reflective material) A: Optical member B closest to the fluorescent tube: Rhombic lens C: Other optical members [Table 2-2] (Structure of V-under-type backlight device (angle 0) Device 1 (0=41.4·, H=16nun) 2(0 =72.3"' H=8.5mm) Average brightness (cd/m2) Tube spot (average uniformity) (%) Average brightness (cd/m2) Tube spot ( Average uniformity) (%) 7th Comparative Example 4947 2.51 3999 2.59 8th Comparative Example 6582 3.21 4951 3.31 In any of the first to eleventh embodiments, the suppression effect of the tube spot was found. The closest to the fluorescent tube in the appropriate range When the haze of the piece is combined with the glossiness of the fluorescent material side of the reflective material, the tube spot can be suppressed, and the structure of the direct type backlight device with high brightness can be obtained without the lamination of other optical members (third) Example) -44- 201015175 In addition, by controlling the haze of the optical member closest to the fluorescent tube, the balance between the suppression effect of the tube spot and the brightness can be changed, and a composition that can cope with various requirements or uses can be proposed. (First, Second, and Fourth Embodiments) Further, by using a lower-gloss reflective material, tube spots can be further suppressed (comparison of the fifth embodiment and the second embodiment, the sixth embodiment and the In addition, by stacking other optical members, the tube spots can be further suppressed, and the order of lamination can be arbitrarily selected. Therefore, various options for the configuration of the direct type backlight device can be obtained (the fifth to eleventh embodiments) Moreover, it is surprising that in almost all configurations, the direct type backlight device which is easy to appear and thinner or which further reduces the number of fluorescent tubes to be mounted is similar to the device 2, the device 2 It is possible to actively suppress the tube spot, and it is not only a direct type backlight device, but also shows that it can be applied to various uses of the machine using the module. Especially in the device 3 having a large angle of 0, the tube spot is good. On the other hand, when the glossiness of the reflective material is more than 5, the tube spot suppressing effect of the direct type backlight device is insufficient even if other members are preferable (comparison of the fourth embodiment and the first comparative example, and the first embodiment) Comparison of the example and the second comparative example). Further, even if each member is selected to have a preferable shape of a crucible or a member, when the longitudinal direction of the convex shape of the rhombic lens is not parallel to the longitudinal direction of the fluorescent tube, the tube spot is rather deteriorated (the third embodiment and the third embodiment) Comparison of the fourth comparative example). When the haze 光学 of the optical member closest to the fluorescent tube is larger than a specific range, the tube spot suppression effect is insufficient even if a plurality of layers of other optical members are laminated (comparison between the ninth embodiment and the sixth comparative example). Further, when the haze 光学 of the optical member closest to the fluorescent tube is larger than a specific range, even if -45-201015175 has a haze of 9 9.0% or less between the optical member closest to the fluorescent tube and the lens, The optical member and the tube spot suppression effect were still insufficient (the fifth and sixth comparative examples). In particular, in the case where the rhombohedron is not disposed, the tube spot is apparent (comparison between the third embodiment and the third comparative example). Further, when the distance between the centers of the adjacent linear light sources is L, and the distance from the center of the linear light source to the optical element closest to the linear light source is Η, the following equation (1) is satisfied. β, when 0 is lower than 45° or 0 is greater than 70°, even if other components are better, tube spots will obviously appear (3rd

A " comparison of the example with the seventh comparative example). 0 = tan — l((L/2)/H)... Equation (1) Again, when 0 is lower than 45° or 0 is greater than 70°, the tube spot suppression effect is still achieved even when other optical members are provided. Not enough (comparison of the fifth embodiment with the eighth comparative example). (Industrial Applicability) The direct type backlight device of the present invention can be applied not only to a liquid crystal display 0 or a liquid crystal television, but also to various surface light sources or illumination devices. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a direct type backlight device of the present invention. Fig. 2 is a schematic view showing the upper portion of the direct type backlight device for tube spot and brightness evaluation of the present invention. [Description of main component symbols] 1 Fluorescent tube (linear light source) 2 Optical member closest to the fluorescent tube (linear light source) -46 - 201015175 3 Length direction of the diamond lens 4 and the fluorescent tube (linear light source) Cross-section of the convex shape in parallel configuration 5 Reflective material 6 Other optical members laminated under the lens L. 7 Other optical members 8 laminated on the lens of the lens Lensmeter

9 Measurement range of tube spot and brightness 10 Line of measurement of tube spot

-47-

Claims (1)

.201015175 VII. Patent application scope: 1. A direct type backlight device, which is provided with a reflective material, a plurality of linear light sources and an optical component group in sequence, wherein: the direct type backlight device satisfies the following (i)~( (a) The plurality of linear light sources are arranged such that the longitudinal directions of the respective linear light sources are parallel; (Π) according to JIS K 7 1 36 (2000), the most optical component group The haze 测 measured by the light incident on the surface of the linear light source from the side of the linear light source is 99.0% or less; (iii) having a diamond lens in the optical element group, the diamond lens is a surface on a side opposite to the side of the linear light source is formed in a plurality of convex shapes extending in a single direction, and longitudinal directions of the plurality of convex shapes are parallel, and a length direction of the plurality of convex shapes and a length of the plurality of linear light sources The direction is parallel; (iv) According to JIS K 7105 (1981), the 60° gloss measured on the surface of the linear light source side of the reflective material is 5 or less: (v) in the plurality of lines The distance between the centers of adjacent linear light sources in the light source is L, and when the distance from the center of the linear light source to the optical element closest to the linear light source is Η, the following equation (1) is satisfied that 0 is 45° S 0 S 70°, 0 ... 1). 2. The direct type backlight device of claim 1, wherein the reflective material has a resin layer containing particles on a side of the linear light source side. -48- 201015175 3. The direct type backlight device of claim 1 or 2, wherein the distance Η is 10 mm. -49-