TW201133042A - Light control plate, light control plate unit, surface light source device, and transmission image display device - Google Patents

Abstract

Disclosed are a light control plate, a light control plate unit, a surface light source device, and a transmission image display device all enabling a higher luminance uniformity when viewed from the front. The light control plate unit (40) is provided with first and second light control plates (401, 402) arranged in order in the thickness direction. The extension directions of first projecting sections (431) and second projecting sections (432) formed on the upper surfaces of the light control plates are substantially parallel to one another. The contour shape of the second projecting sections is a right triangle. If the axis passing through both ends of the first projecting sections on a cross section of the first projecting sections is the x axis, if an axis perpendicular to the x axis is the z axis, and if the length of the first projecting sections along the x axis is wa, the contour shape of the first projecting sections is expressed by z(x) satisfying 0.95z0(x)=z(x)=1.05z0(x) when x is -0.475wa=x=0.475wa, and z0(x) satisfies the expression. With this, (In expression (1), C2k for k=1 to 8 is a prescribed constant.)

Description

201133042 VI. Description of the Invention: [Technical Field] The present invention relates to a light control panel, a light control panel unit, a surface light source device, and a transmissive image display device. [Prior Art] As a direct type image display device which is an example of a transmissive image display device such as a liquid crystal television, a light source is disposed on the back side of the transmissive image display unit. As the direct type image display device, it is preferable that the light from the light source is uniformly dispersed, whereby the transmission type image display portion can be uniformly illuminated. Therefore, between the light source and the transmissive image display unit, a light control panel that emits light that is incident from the light source side toward the transmissive image display unit is disposed (for example, see Patent Document 1: 曰本特开2004- Japanese Patent Publication No. 127680) Since the light control panel normally emits light from the light source of the light diffusing plate by the light control panel, the light source and the light control panel constitute a surface light source device. CITATION LIST Patent Literature Patent Literature 1: JP-A-2004-127680 SUMMARY OF THE INVENTION Problems to be Solved by the Invention In recent years, the distance between light sources has been reduced with the thinning or power saving of the transmission type image display device. Increase, on the other hand, the distance between the light source and the light control panel becomes closer. Therefore, even if the previous light control panel is irradiated with light diffusion 153850.doc 201133042, sufficient brightness uniformity cannot be obtained. Accordingly, it is an object of the present invention to provide a light control panel, a light control panel unit 'surface light source device, and a transmissive image display device which can achieve higher brightness uniformity on the front side. Means for Solving the Problems The present inventors conducted intensive studies to solve the above problems. The inventors have found that the surface shape of a light control panel which can achieve a higher degree of brightness uniformity in the front direction, and finally completes the present invention. That is, the light control panel of the present invention is a light control panel that emits light incident from the pupil plane from the second surface located on the opposite side to the first surface. The light control panel of the present invention includes a plurality of convex portions formed on the second surface. Each of the plurality of convex portions extends in the first direction, and the plurality of convex portions are arranged side by side in a second direction substantially orthogonal to the second direction. The axis passing through both ends of each convex portion is an χ axis at an orthogonal cross section perpendicular to a plurality of convex portions of each of the plurality of convex portions, and the X axis is passed through the center of both ends and orthogonal When the axis of the x-axis is set to 2 axes, and the length of the X-axis of each convex portion is set to %, the contour shape of each convex portion of the orthogonal scraping surface is -〇.475xwagxS〇.475><wa, satisfying the gas (1) of z(x) means: [number 1] 0.95χζ〇(χ)^ ζ(χ)^ 1.05χζ〇(χ)...(1) where, in the formula (1), z〇(x) satisfies the formula (2): [Number 2]

z Μ 153850.doc (2) 201133042 (In equation (2), C2, C4, c$, Cs, Cio, C12, Ci4, Ci6 are (i) c2=0.762469824257553 'C4=0.298075662262927 ' C6=-0.55969338153661 , C8=0.896468280253265, C10=-0.657164166213715, C12=-〇.615726418495985, C14=l.245151353938560 'C16=-0.520559083769482; (ii) C2=〇.828034790338647 'C4=0.322164108625275 'C6=-0.683409388408353, C8=l.221645232748140 ,

Ci〇=-l.204381259337210 ' C12=-0.140913871787724 , C14=l.033110858219420 , C16=-0.475388345540708 ; or (iii) C2=0.908743053413473 ' C4=〇.412136074245729 ' C6=-l.052244441109330 , C8=l .939746214284020 , CI0=-2.0133001 1523 1620 , C12=〇.074678489261357 , C14=l.376932293623570 > Ci6=-〇.680081068815946) According to this configuration, since the convex portion has the contour shape represented by the above z(x), The brightness in the front direction of the light emitted from the light control panel can be made higher. 6 The light control panel of the present invention may comprise a transparent material, and the refractive index of each convex portion may be set to 1.56 or more and 1.62 or less. Further, the light control panel unit of the present invention includes a first light control panel that emits light incident from the first surface from a second surface located on the opposite side of the first surface, and the first light control panel is formed on the second surface a plurality of first convex portions extending in the first direction and arranged in parallel in the second direction substantially perpendicular to the first direction; and light incident from the third surface from the fourth surface on the opposite side to the third surface The second light control plate that is emitted, the second light control plate is formed on the fourth surface and extends in the third direction, and the 153850.doc 201133042 column is arranged in a plurality of the fourth direction substantially orthogonal to the third direction. 2& The second light control panel is located on the third light control panel, and the third surface of the second light control panel is located at the first! On the second surface side of the light control panel, the third direction is provided so as to be substantially parallel to the first direction. The outline shape of each of the second convex portions which is substantially perpendicular to the cross section of each of the plurality of second convex portions is a triangle having a substantially right angle. The axis passing through both ends of each of the second convex portions is defined as an X-axis at an orthogonal cross section perpendicular to the extending direction of each of the plurality of first convex portions, and is passed between the ends on the x-axis. At the center and the axis orthogonal to the χ axis is the Ζ axis ', and the length of the X-axis of each of the first convex portions is set to ^, the contour shape of each of the first convex portions is at the positive parent cross section. In the case of -〇_475xwaSxS〇.475xWd, satisfying the formula (3) (ζ) means: [Number 3] 〇.95xz〇(x)^ z(x)^ 1.05xz〇(x)...(3 Where 'in equation (3), Z〇(x) satisfies equation (4): [number 4]

(4) (In equation (4), 'C2, C4, C6, C8, C10, C12, C14, C16 are (i) C2=0.762469824257553, C4=〇.298075662262927, C6=-0.55969338153661, C8=0.896468280253265, C ,〇=-0.657164166213715 ' C12=-0.615726418495985 , CI4=1.245151353938560 ' Ci6=-〇.520559083769482 ; (ii) C2=〇.828034790338647 ' C4=〇-322164108625275 > C6=-〇.683409388408353 , C8=l .221645232748140 , 153850.doc -6- 201133042

Cj 0=-1.2043 8 125 93 3 7210 , C12 = -〇. 140913 871 787724 , C14=l.033110858219420 , C16=-0.475388345540708 ; or (iii) C2=0.908743053413473 ' C4=0.412136074245729 ' C6=-l.052244441 109330 , C8=l.939746214284020,

Ci〇=-2.0133001 15231620, C12 = 0.0746784892613 57,

Ci4=l.376932293623570 'C16=-〇.680081068815946)° In the light control panel unit, the first and second convex portions having the contour shape of the cross section described above are formed on the first and second light control plates, and The second light control panel is disposed on the second light control panel 'having that the third surface is located on the second surface side and the first and third directions are substantially uniform. Therefore, the brightness of the front side of the light emitted from the light control panel unit can be made more uniform. Further, in the light control panel unit of the present invention, the outline 各> of each of the second convex portions can be an equilateral triangle whose apex angle is substantially a right angle. Further, in the light control panel unit of the present invention, the first light control plate may include a transparent material, and the refractive index of each of the first convex portions may be 156 or more and 62 or less. The surface light source device of the present invention comprises the light control panel of the present invention, and a plurality of light sources that are disposed apart from each other and that supply light to the light control panel. Or, the surface light source device of the present invention includes the light control panel unit of the present invention, and a plurality of light sources for supplying light to the light control panel unit. Since the surface light source device of the present invention includes the light control panel or the light control panel unit of the present invention, light having a higher brightness uniformity can be emitted in the front direction. The transmissive image display device of the present invention includes the light control panel of the present invention; a light source that is disposed apart from each other and supplies light to the light control panel; and is illuminated by light from a plurality of 153850.doc 201133042 light sources and passing through the light control panel Transmitting the image display unit. Or the transmissive image display device of the present invention includes the plurality of light sources that are disposed apart from each other and that supply light to the light control panel unit, and are output from the plurality of light sources and pass through the light control panel unit A transmissive image display unit illuminated by the light. According to the transmissive image display device of the present invention, since the light control panel or the light control panel unit of the present invention is provided, the transmissive imaging display portion can be illuminated with light having a higher degree of brightness uniformity in the front surface direction. Therefore, it is possible to display an image of good quality. According to the present invention, it is possible to provide a light control panel or a light control panel unit that can achieve higher brightness uniformity in the front direction, and a light control panel or a light control panel. The surface light source device and the transmissive image display device of the unit. [Embodiment] Hereinafter, embodiments of a light control panel, a light control panel unit, a surface light source device, and a transmissive image display device according to the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and the description thereof will be omitted. The size ratio of the drawings is not necessarily consistent with the description. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing the configuration of an embodiment of a transmission type image display device of the present invention. Fig. 1 is an exploded view showing a transmission type image display device. The transmissive imaging device 丨 includes a transmissive imaging display unit 10 and a surface light source device 20 disposed on the back side of the transmissive imaging display unit 10 in Fig. 1 . As shown in FIG. 1 , in the following description, the direction in which the surface light source device 2 〇 and the through-image display portion 10 are 153850.doc 201133042 is referred to as 2 directions (plate thickness direction and the father is in the Z direction). The two directions are referred to as a 乂 direction and a y direction. The χ direction and the y direction are orthogonal to each other. The transmission type image display unit 10 is generally a liquid crystal display panel in which linear polarizing plates 12 and 13 are disposed on both surfaces of a liquid crystal cell. In this case, the transmissive image display device 丨 is a liquid crystal display device (or a liquid crystal television). The liquid crystal cell 11 and the polarizing plates 12 and 13 can be used in a transmissive imaging device such as a conventional liquid crystal display device. The liquid crystal cell n is generally a well-known liquid crystal cell such as a TFT type liquid crystal cell or an STN type liquid crystal cell. The surface light source device 20 is a so-called direct type surface light source device. The surface light source device 20 has a plurality of light sources 31 arranged in parallel in the x direction. The light source unit 3 is a linear light source extending in the y direction. The light source 3 is usually a straight tubular light source such as a fluorescent lamp (cold cathode ray lamp). Usually, the light source 3 1 is The direction in which the light source 31 extends is arranged in the longitudinal direction of the screen of the transmissive image display device 1. The plurality of light sources 3 are arranged at intervals so that the central axes of the respective light sources 3 i are located in the same plane. The distance between the central axes of the adjacent two light sources 31 and 31 is Lx, and the distance Lx is, for example, 1 mm to 15 mm. Here, the light source 31 will be described as a linear light source. The light source 31 may also be a point light source such as a light emitting diode (LED). As shown in Fig. 1, a plurality of light sources 3 1 are preferably disposed in the light box 32. The inner surface 32a of the light box 32 is preferably The light from the light source 31 is output to the side of the transmissive image display unit, so that the light from each of the light sources 31 can be effectively utilized. In the present embodiment, the light source is used. 153850.doc Λ 201133042 The part 30 is described as the light box 32 having the above-described configuration. The surface light source device 20 is on the front surface side (upper side in FIG. 1) of the light source unit 30, that is, on the side of the transmission type image display unit 10. The light control panel unit 40 is disposed away from the light source The light control panel unit 40 is not used to project the image of each light source 31 to the transmission type image display unit 10, but to diffuse the light from the light source unit 30 to the transmission type image display unit. 2 is a perspective view showing a configuration example of a light control panel unit. The light control panel unit 40 according to an embodiment of the light control panel unit of the present invention includes a first light control panel 4〇1 and a second light control panel 402. The first light The control panel 40! and the second light control panel 4〇2 are sequentially disposed in the z direction. For convenience of explanation, the state in which the first light control panel 40! and the second light control panel 402 are separated is shown in Fig. 1. The second light control panel 4〇2 may be laminated on the first light control panel 4(^) so as to be connected to the first light control panel 4〇. The first and second light control plates 40, 402 constituting the light control panel unit 40 have substantially the same top view shape (the shape viewed from the z direction), and are generally rectangular. The top view shape of the first and second light control plates 4 (the shape of the top view of the light control panel unit 40) is a size of the light-transmissive image display device 1 suitable for the purpose. The size of the second and second light control plates 40, 402 is usually 250 mm x 440 mm or more, preferably 1 〇 20 mm x l 800 mm or less. The first and second light control boards 4 〇丨 ~ 〇 The shape of the top view of 2 is not limited to a rectangular shape, and may be a square. However, in the following description, the first and second light control plates 40^402 have a rectangular shape in plan view unless otherwise specified. [First Light Control Plate] 153850.doc •10· 201133042 The light control panel 4〇1 has an A flat bottom (W) 4ii, and a plurality of convex convex portions (i-th convex portions) 431 are formed on the outer side. The (second surface) is called a plate-shaped body. The i-th light control plate is a light-diffusing plate that disperses light by, for example, the difference in the light exiting position of the convex portion 43. Further, since the second control panel 4 〇1 will be based on the exit position of the light of the convex portion 43ι (4) the direction of light emission, so it can also be called to give adjustment light The shape of the deflecting structural plate is referred to as a "plate", but may be referred to as a light control sheet or a first light control film depending on the thickness. The convex portion 431 is in one direction, that is, Y1 in FIG. The direction (first direction) extends. The plurality of convex portions 43l are arranged side by side in a direction substantially orthogonal to the direction of the magic direction (the second direction). The distance between the convex portions 431 shown in FIG. The first light control plate 40 will be described as a component. The distance or the number of the plurality of convex portions 43 can be determined according to the pixel size or screen size of the transmissive image display device to which the light control panel unit 4G is applied. The rim shape of the cross section of the portion 43! (hereinafter also referred to as the cross-sectional shape) is substantially the same between the plurality of convex portions 431. The cross-sectional shape of the convex portion 43i is substantially uniform in the extending direction of the convex portion 43. Adjacent 2 The ends 43ai and 43 of the convex portions 43 and 43 are located at the same position in the direction of the 乂 1. The thickness 4 of the third light control panel 4 为 is the top 431 of the lower portion and the convex portion 43. The distance in the 2 directions. The thickness di is usually 0.5 mm to 5 mm. [Second Light Control Plate] The second light control plate 4〇2 has a substantially flat lower surface (third surface) 4丨2, and a plurality of convex convex portions (second convex portions) 432 are formed on the outer side. The plate-shaped body of the upper surface (fourth surface) 422. The convex portion 432 has a triangular cross section 153 153850.doc -11· 201133042. Therefore, the second light control panel 4〇2 is a so-called seesaw. Here, although referred to as "plate", it may be referred to as a second light control sheet or a second light control film depending on the thickness. The convex portion 432 is extended in one direction, that is, in the 丫2 direction (third direction) of Fig. 2 . The plurality of convex portions 432 are arranged side by side in the χ2 direction (fourth direction) substantially orthogonal to the γ2 direction. The distance or the number of the convex portions 432 shown in Fig. 2 is the same as that of the convex portion 43 and is convenient for explaining the constitution of the second light control plate 4〇2. The distance or the number of the plurality of convex portions 432 can be determined according to the pixel size or the kneading size of the transmissive image display device 1 to which the light control panel unit 40 is applied. The cross-sectional shape of the convex portion 432 is substantially the same between the plurality of convex portions 432. Further, the cross-sectional shape is substantially uniform in the extending direction of the convex portion 43A. The ends 43az and 43a2 of the adjacent two convex portions 43A and 432 are located at the same position in the Χ2 direction. The thickness d2 of the second light control plate 4〇2 is the distance between the lower surface 412 and the top portion 43b2iz of the convex portion 432, and is usually 〇1 mm to 5 mm. [Arrangement relationship between the first and second light control boards] As shown in Fig. 2, the second light control board 4〇2 is located on the first light control board 4〇1, and the lower side of the second light control board 4〇2 2 is located on the upper surface 42i side of the first light control plate 4〇1, and the extending direction (Y1 direction) of the convex portion 431 and the extending direction (Y2 direction) of the convex portion 432 are arranged substantially in parallel. In this case, the arrangement direction (X1 direction) of the plurality of convex portions 43 and the arrangement direction (X2 direction) of the plurality of convex portions 432 are also substantially parallel. The first and second light control plates 4 (the distance d12 between ^4 and 4〇2 are the top 43bi of the convex portion 43 of the first light control plate 40) and the lower surface of the second light control plate 402 are 153850.doc -12· 201133042 The distance in the z direction between 412. The distance from the mountain 2 is usually 5 mm or less. From the viewpoint of miniaturizing the light control panel unit 40, the mountain 2 is a clawed melon, and the second light control panel 4下面2 below the 4〇2 can also be connected to the convex portion 43 of the light control panel 4〇, and the top portion 43N is arranged. Thus, the first and second light control panels 40, 4〇2 In the case of the contact, the thickness 7 of the second light control plate 4〇2 is preferably set to be smaller than the thickness dl of the first light control plate 4. The reason is, for example, that the second light control plate 4 is used. In the case where the 〇2 is thinner than the film shape, the first light control plate 4 can be used as the support table of the second light control plate 4〇2. [The convex portion of the first light control plate] The convex portion 43 of the first light control plate 40! will be described. Fig. 3 is a view showing an example of the cross-sectional shape of the convex portion of the first light control plate. a convex portion 431. Use as shown in Figure 3. The local xz coordinate system. In Figure 3, the axis of the χζ coordinate system is parallel to the phantom direction and the ζ axis is parallel to the thickness direction. On the 乂2 sides of the xz coordinate system, the ends of the convex part % ^ ' 43^ The shape of the contour (cross-sectional shape) at the section of the convex portion of the _ death's is satisfied by the z(x) of the formula (5): [5] °-95x2〇(x)S z(x )^ 1.05xz〇(x)...(5) But in equation (5), z〇(x) satisfies equation (6): [number 6] relative to k=l~8 *弋(6) , wa is the length of the X-axis of the convex portion 43丨 153850.doc

C, C4, C6, C8, C of each of S • 13· 201133042. The C丨2, c丨4, and Cl6 groups are usually the first group shown below. [Group 1] C2=〇.762469824257553 C4=0.298075662262927 C6=-0.559629338153661 C8=0.896468280253265 C10=-〇.657164166213715 C)2 = -〇.615726418495985 C14=l.245151353938560 C16=-0.520559083769482 In Figure 3 'exemplary there is In the range satisfying the formula (5), 2 〇 (^ is stretched by a specific multiple (for example, 1 time) in the z direction. In this case, the convex portion 43 has a cross-sectional shape that is symmetrical with respect to the z-axis. The cross-sectional shape of 43 is not limited to a shape in which 2 〇 (5 伸缩 is stretched by a specific multiple (for example, 1 time) in the two directions, as long as the formula (5) is satisfied. The ζ (χ) expression satisfying the formula (5) is satisfied. The cross-sectional shape of the convex portion 43] is as shown in Fig. 4. As long as the 宽度(χ) is determined for a certain width wa, the outline is represented by 〇.95><2〇(?〇 L'〇5Xz〇(x) indicates that the outline of the area between the contour lines indicates the cross-sectional shape. Usually, the width wa of the convex portion 431 is usually 40 μm from the easy formation of the convex portion 43. The above is preferably 8 〇μπι or more, and it is difficult to visually recognize the pattern caused by the convex portion 431. Usually, it is 8 〇〇μηη or less, preferably 450 μηη or less. The specific examples of the width ' are 41〇, 4〇〇, 325 153850.doc -14·201133042 μπι, 280 μπι and 100 μιη. But the value of wa is not In the above description, the cross-sectional shape of the convex portion is expressed by z(x) of the formula (5), but the cross-sectional shape of the convex portion 43丨 is as long as it is at _ 〇.475xwaSx$〇.475&gt The reason that z(x) satisfying the formula (5) is represented by <wa. The reason is that there is a tendency that the forming error relatively increases near the pendulum (near the end) of the convex portion 431, and The shape near the hem has little effect on the diffusibility of light. [The convex portion of the second light control plate] The shape of the convex portion 433 having the light control plate 420 of the second light is explained. FIG. 5 is a side view of the second light control plate 4〇2 viewed from the extending direction of the convex portion 432. The convex portion 432 is substantially uniform in the extending direction. The shape, as shown in FIG. $, the side shape viewed from the extending direction corresponds to the direction orthogonal to the direction in which the convex portion 432 extends. Surface shape side shape (or cross-sectional shape) of the convex portion 432 is preferably a substantially right triangle apex angle α is substantially a right angle, the two sides of a length constituting an apex angle substantially equal to the right angle of substantially equilateral triangle. The apex angle α is preferably 9 〇 0, but it is only required to be in the range of 80 ° to 1 〇〇 °. The two adjacent convex portions "" and the distance ρ are usually 10 μm to 1000 μηι. The pitch Ρ is preferably 2 〇μηι 5 5 , more preferably 40 μm to 250 μηη. The width of the convex portion 432 is set. The distance between the convex portions μ is set to a specific value within the above range. [Layer configuration of the first and second light control plates] The first and second light control plates 4〇1, 4〇2 may be A single-layer board made of a single transparent material. The first and second light-control boards 4〇, may also be a multi-layered structure of a multilayer structure in which layers of transparent materials different in s 153850.doc -15·201133042 are laminated. The first and second light control plates 40 are preferably constructed as the first and second light control plates 40, and the single or double faces of the 4〇2 are generally thick. Π) μΐη~200, preferably 2〇μιη~1, which is called the skin layer. In this case, 'as a transparent resin material constituting the skin layer, preferably using an ultraviolet absorber added thereto' by using the above composition It can prevent the third and second light control boards 4 from the ultraviolet light contained in the light source 31 or the outside light (^ 4 〇 2 deterioration. Especially in the case of using a fluorescent lamp or the like as the light source 31, it is preferable to form a skin layer under the following 4 ΐ, 4 ΐ 2 from the viewpoint of preventing deterioration of ultraviolet rays from the glory lamp. In terms of cost, it is preferable that the skin layer is formed on the upper surface 42!, 422. As the transparent resin material constituting the skin layer, the case where the ultraviolet absorber is added is used as the transparent resin. The material is based on the standard 'usually 0.5% by mass to 5% by mass, and ^ is 】% by mass to 2.5% by mass. It is also possible to apply one or both sides of the first and second light control panels. The antistatic agent can prevent the adsorption of dust due to static electricity by applying a charge preventing agent, thereby preventing the light transmittance from being lowered by the adsorption of dust. To reduce the interference fringes, the surface on the side of the light source 31 can be made to have light. For example, as described above, the surface layer of the fine particles called matting agent in Chinese may be formed on the side of the light source 31, and the surface on the side of the light source 31 may be embossed or sandblasted, or Paint The cloth contains a matting agent and a coating agent 153850.doc • 16 · 201133042 The cloth liquid forms a matting layer. [Constituent material] The first and second light control plates 40丨, 4〇2 contain a transparent material. The refractive index of the transparent material is usually It is 1.55~1.62. The transparent material is usually a transparent resin material and a transparent glass material. The transparent resin material is usually polycarbonate resin (refractive index: 1.59), MS resin (methyl methacrylate styrene copolymer resin) (refraction) Rate: 1.56 to 1.59), polystyrene resin (refractive index: 丨59), as resin (acrylonitrile-styrene copolymer resin) (refractive index: 丨56 to 丨59), and the like. In view of cost and low moisture absorption rate, the transparent material is preferably a polystyrene resin. As a transparent material, it is possible to add an ultraviolet absorber, a charge inhibitor, an antioxidant, a centering agent, a flame retardant, a lubricant, and the like to the transparent resin material. These additives may be used alone or in combination of two or more. The ultraviolet absorber is usually a benzotriazole-based ultraviolet absorber, a dimerized-ketone-based ultraviolet absorber, a cyanoacrylate-based ultraviolet absorber, a malonate-based ultraviolet absorber, an oxalic acid-aniline-based ultraviolet absorber, or a triazine. It is a UV absorber or the like. The ultraviolet absorber is usually preferably a benzotriazole system external absorbent or a triazine ultraviolet absorber. The μ μ transparent resin material is usually not added with a light diffusing agent as an additive. However, if it is an amount which does not significantly impair the object of the present invention, the use of a light diffusing agent is added. As the light diffusing agent, a powder having a refractive index different from that of the first and second light control plates 40A and 4B as described above is usually used. 3 Production 153850.doc .. 201133042 & Light diffusing agent is dispersed in transparent materials. The above-mentioned light diffusing agent is usually an inorganic particle such as an organic particle such as a styrene resin particle or a methyl acrylate resin particle, a core particle, a silica dioxide particle, or a linaloyl resin particle. The particle size of such particles is usually from 0.8 μm to 50 μm. [Manufacturing Method of First and Second Light Control Panels] The light control panel 4 (^, 4〇2 can be manufactured by, for example, a method of cutting from a transparent material. Further, as a transparent material, a transparent resin material is used. It can be produced by a usual method such as injection molding, extrusion molding, photopolymerization, or press molding. [Arrangement of Light Control Panel Unit] The above-described configuration and the second light control panel 4〇 】, 4 〇 2 light control panel unit 4 以 so that the distance D from the light source 31 to the first light control panel 40, the lower surface 41 l (refer to the figure is usually 3 _ ~ 5 〇匪, relative light source ^ In the transmissive image display device 1 or the surface light source device 20, LX&D is preferably lx/D from the viewpoint of making the transmissive imaging device 1 and the surface light source device 20 thin. 2 or more, more preferably a value of 25 or more. The light control panel unit 40 is in the transmission type image display device and the surface light source device such that the convex portion 43 of the first light control plate 401 extends in the direction (γ) The 1 direction) is arranged substantially parallel to the extending direction (yl direction) of the light source 31. In this case, the XI direction The direction of Χ2 is substantially parallel to the direction shown in Fig.!, and the directions of Υ1 and Υ2 are substantially parallel to the direction of 丫. The direction of χι and γι are preferably parallel to the X direction and the y direction, respectively, but may be relative to each other, for example, due to manufacturing errors. It is offset by ±10 in the X direction and the ¥ direction, which is the same as the χ2 direction and the 丫2 direction. 153850.doc •18· 201133042=The light control panel unit shown in the financial transmission type image display device], right convex The extending direction of the phase is substantially parallel to the extending direction of the light source 31, and the direction in which the extending direction of the weir portion 431 can be arranged in the longitudinal direction of the screen can be arranged in the same manner. Second, as shown in FIG. The case where the light control panel unit 40 is applied to the transmission type display device 1 will be described as an example of the effect of the light control panel unit. Here, the XI direction and the magic direction are set to be parallel to the χ direction, and the θ direction and The Υ2 direction is parallel to the seven directions. The cross-sectional shape of the convex portion 432 is a right-angled equilateral triangle whose apex angle α is substantially a right angle. The surface light source device 2 包含 and the transmissive image display device including the light control panel unit 40 1 from the light The light output from each of the light sources 31 of the source portion 30 is directly incident on or reflected by the inner surface 32a of the light box 32 to the light control panel unit 4. The light incident on the light control panel unit 40 sequentially passes through the second and second light control panels 4 ι, 4〇2. On the upper surface 41! of the first light control plate 40!, a convex portion 43' having a cross-sectional shape indicated by the above ζ(χ) is formed on the upper surface of the second light control plate 4〇2 412 is formed with a convex portion 432 having a cross-sectional shape of a right-angled equilateral triangle. Further, the second light control plate 4〇2 is provided on the first light control plate 4, and the extending direction and convex shape of the convex portion 43! The extending directions of the portions 432 are substantially parallel to each other. Therefore, the light control panel unit 40 having the first and second light control plates 402 can emit light from the light source 31 as light having a higher brightness in the front direction, that is, a direction substantially parallel to the z direction. . Since the light emitted from the light control panel unit 40 is irradiated to the transmissive image display unit 10, the transmissive image display unit 1 can be illuminated by light having a higher brightness uniformity. 153850.doc -19·201133042 Since the surface light source device 20 has the light control panel unit 4A, the light output from the light source 31 is emitted through the light control panel unit 4(). Therefore, the surface light source device 2 can output light having a higher brightness uniformity in the front direction. In the transmissive image display device i including the light control panel unit 40, the transmissive image display unit 1 can be illuminated by light having a higher brightness uniformity, so that the display quality of the artifact can be improved. Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, in the above-described embodiment, the light control panel unit 40 is described as an example of the transmission type image display device and the surface light source device of the present invention. However, a cross-sectional view showing a configuration of another embodiment of the transmissive image display device of the present invention can be schematically employed by using the transmissive imaging device 2 and the surface light source device 50 shown in Fig. 6 . In Fig. 6, as in the case of Fig. 1, the transmissive type image display device 2, the transmissive image display device 2, and the transmissive image display device 2 have a surface light source device%. In the image display device 1 and the surface light source device 20, in place of the light control panel unit 4, the i-th light control panel 4 is used to diffuse the light from the light source 31 to the side of the transmissive image display unit. The other components are the same. In this configuration, the first light control panel 4〇1 also has a convex portion a that satisfies the cross-sectional shape represented by z(x) of the equation (5), so that the first light control panel 4〇丨 can be on the front side. The direction emits light with a higher degree of brightness. As a result, the surface light source device 50 can output a planar light having a higher brightness uniformity in the front direction. In addition, in the transmissive image display device 2, it can be illuminated in the front direction 153850.doc •20·201133042 with a more uniform degree of uniformity.

10', it can display good quality images. - like "No." P. The cross-sectional shape of the convex portion 431 of the first light control plate 401 is the same as that of the light control panel unit 4G in the case of the ===, and the same shape as that shown in Fig. 4 can be used. (5) Different shapes within the scope. Further, the first light control panel 4 () 1 is a uniform optical component that is adjusted to be substantially parallel to the luminance in a plane in which a plane of a plurality of lights (4) is arranged.

can. For example, the first light control plate 4〇1 may be formed on the exit side of the light including the plate of the transparent material, and has a plurality of optical portions 431 which are optically thin. In addition, the end 43a of the cross-sectional shape of the adjacent two convex parts 43i is referred to as being overlapped in the arrangement direction of the convex portions 43l. Further, the end 43a of the adjacent convex portion 43l may have a slightly flat portion (for example, a degree due to a manufacturing error). This is the same as the configuration of the convex portion %. Further, the light control panel unit 4 shown in FIG. 1 may further have a diffusion film, a microlens film, a twist-up film, or a reflective polarizing film on the side of the transmission-type image display unit 10 (for example, on the liquid crystal panel side). Optical film. Further, the transmissive image display device i may be further provided between the light control panel unit 40 and the transmissive imaging display portion H) with the above-described diffusion film, microlens film, brightness rising film or reflective polarizing film. The composition of optical films. Similarly, the transmissive image display device 2 can be further provided with a 153850.doc •21 · 201133042 diffusion film and a microlens film between the first light control plate 43l and the transmission type image display unit 1A shown in FIG. The composition of an optical film such as a brightness rising film or a reflective polarizing film. In the description so far, the plurality of light sources 3A included in the light source unit 30 are arranged at substantially equal intervals at intervals Lx, but the distance between the adjacent two light sources 3丨 and 3丨 may be different. In this case, the ratio of the distance between the light source 3 与 and the distance between the light source 3 丨 and the ith light control panel 40 定义 can be defined by using the average distance between the adjacent two light sources 3 丨 and 3 。. In the description so far, the C2k (k = 1 to 8) group in the formula (6) is set to the first group described above. However, the C2k (k=l~8) group may also be the second group as shown below. [Group 2] C2=0.828034790338647 〇4=〇.322164108625275 C6=-0.683409388408353 C8=l.221645232748140 Ci〇=-l.204381259337210 Ci 2=-0.140913 87 178 7724 Ci4=l.033110858219420 Cj6=-0.475388345540708 For ease of explanation The case where the group is the second group is called z2(x), and z〇(x) is called ζ2〇(χ). In this case, ζ(χ) and z〇(x) in the equation (7) correspond to Ζ2(8) and ζ2〇(χ). Fig. 7 shows a case where "(Η, an example of the cross-sectional shape of the convex portion 43l in the case of the second group, the Η) group is the case of the second group, the convex portion 43, and the cross-sectional shape is not limited to Z2. (8) The shape of the telescopic Μ times (for example, 倍) in the z direction is only (four) feet ^ (4) Table I53850.doc • 22- 201133042 It can be expressed as the formula (5) of z2(x). To satisfy the formula (5) The cross-sectional shape of the convex portion 43 ι as shown in FIG. 8 is as shown in FIG. 8 , and is expressed by 〇 95 >< z20 (x) as long as it is a certain width w 疋 z20 (x) The outline of the area between the rim line and the contour line indicated by 1.05xz2〇(x) is sufficient. The cross-sectional shape of the convex portion 43丨 is only -0.475xWaSx$ 0.475xWa. To satisfy the formula (5: ^ ζ 2 (χ) means that this point 'C2k (k = l ~ 8) group is the same as the case of the first group. Furthermore, C2k in equation (6) (k = l ~ 8) The group can also be group 3 as shown below. [Group 3] C2 = 0.908743053413473 C4=0.412136074245729 C6=-l .0522444411093 3 0 C8= 1.939746214284020 C10=-2.013300115231620 Ci2=0.074678489261357 Ci4=l.376932293623570 C16=- 0 .680081068815946 For convenience of explanation, z(x) in the case where the C2k (k=l~8) group is the third group is referred to as z3(x), and z〇(x) is referred to as z3q(x). In the formula (5), ζ(χ) and z〇(x) correspond to ζ3(χ) and ζ3〇(χ). Figure 9 shows the convexity of the case where the C2k (k=l~8) group is the third group. An example of the cross-sectional shape of the shape 43]. When the group of CMhl~8) is the third group, the cross-sectional shape of the convex portion 431 is not limited to stretching the z3〇(x) to the z direction by a specific multiple (for example, 1)) 153850.doc -23- 201133042 The opening/shape 'only the formula (5) is sufficient. The cross-sectional shape of the convex portion 431 represented by (4) of the formula (5) is as shown in Fig. 1A, as long as When z3g(x) is determined for a certain width wa, it is represented by a rim line passing through the area between the wheel temple line indicated by 〇95χζ3〇(χ) and the rim line indicated by 1.G5XZ3.(8). The cross-sectional shape is 彳. The cross-sectional shape of the convex portion 43丨 is as long as it is -〇.475xWasxg〇475><WaI^, to satisfy the expression (7) of &(8), C2k(k=l~8) The group is the same as in the first group. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a configuration of an embodiment of a transmissive image display device of the present invention. Fig. 2 is a perspective view showing a light control panel 7G used in the transmissive image display device shown in Fig. 1. Fig. 3 is a view showing an example of a contour shape of a convex portion of the first light control plate. (4) ^ contour shape satisfaction example = one of the rim shapes of the a-shaped portion of the second light control plate is shown in Fig. 6 is a nuclear type showing the embodiment of the transmission type image of the present invention A cross-sectional view of the composition. Others of the Ding Crack Figure 7 is a view showing another example of the convex portion of the light control panel. Fig. 8 is a view showing conditions in which the shape of the first light control plate shown in Fig. 7 is satisfied. Μ 之 wheel 153850.doc -24· 201133042 Fig. 9 is a view showing another example of the convex portion of the third light control panel. Fig. 10 is a view showing a condition that the shape of the temple of the convex portion of the third light control panel shown in Fig. 9 is satisfied. [Description of main component symbols] 1. 2 transmission type image display device 10 transmission type image display unit 20, 50 surface light source device 30 light source unit 31 light source 40 light control panel unit 40, first light control panel (light control panel) 402 second light control plate 41, lower surface (first surface) 412 lower surface (third surface) 42, upper surface (second surface) 422 upper surface (fourth surface) 43, convex portion (first convex portion) 432 convex End (2nd convex part) 43a], 43a] End of the first convex part 43a2 ' 43a2 End of the second convex part 153850.doc • 25·

Claims (1)

201133042 VII. Patent Application Range: 1. A light control panel that emits light from a second surface that is incident on the opposite side of the first surface from the first surface, and the light is formed from the second surface of the second surface. a plurality of convex portions; each of the plurality of convex portions extending in the second direction, and the plurality of convex portions are arranged side by side in a second direction substantially orthogonal to the second direction; substantially orthogonal to An orthogonal cross section of each of the plurality of convex portions in the second direction, wherein the axis passing through both ends of each of the convex portions is a χ axis, and the X axis is passed through a center of the both ends and orthogonal to the above When the axis of the X-axis is the ζ axis ' and the length of the 乂 axial direction of the convex portion is set to ^, the cross-sectional shape of each of the convex portions of the orthogonal cross-section is _ 0.475xwaSx$〇.475xwa , satisfying the formula (1) (ζ) means: [number 1] 〇.95><ζ〇(χ)^ ζ(χ)^ 1.05χζ〇(χ)...(1) where, in the formula (1) ), ζ〇(χ) satisfies the formula (2): [Number 2] (In equation (2), C2, C4, C6, C8, C10, C12, C14, C16 are C2 = 0.762469824257553 'C4=〇.298075662262927 > C6=-0.55969338153661, C8=〇.896468280253265, Ci〇=-〇 .657164166213715 'C,2=-〇.615726418495985 > C14=1.245151353938560, C16=-〇.520559083769482; or 153850.doc 201133042 C2=〇.828034790338647 'C4=〇.322164108625275 ' C6=-0.683409388408353 , C8=l . 221645232748140, C10=-l.204381259337210, C12=-0.140913871787724, C14=1.0331 10858219420, C16=-0.475388345540708; or C2=0.908743053413473, C4=0.412136074245729, C6=-l.052244441109330, C8= 1.939746214284020, C10=-2.013300115231620, C12 = 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 the following. 3. A surface light source device comprising: a light control panel according to claim 1 or claim 2; and a plurality of light sources configured to supply light to said light control panel. A transmissive imaging display device comprising: a light control panel according to claim 1 or claim 2; a plurality of light sources that are disposed apart from each other to supply light to said light control panel; and output from said plurality of light sources And a transmissive image display unit β illuminating the light of the light control panel, wherein the light control panel unit includes: light incident from the first surface from a second surface located on a side opposite to the first surface The first light control panel that is emitted, the first light control panel has a plurality of planes extending in the first direction and arranged in parallel in the second direction substantially perpendicular to the first direction in the second surface shape 153850.doc 201133042 a first convex portion; a second light control plate that emits light incident from the third surface from a fourth surface on a side opposite to the third surface, wherein the second light control plate is formed on the fourth surface a plurality of second convex portions extending in the third direction and arranged in a direction substantially perpendicular to the fourth direction of the third direction, wherein the second light control plate is located on the first light control plate, and the The third surface of the light control panel is located at the third light control The second surface side of the plate is provided such that the third direction is substantially parallel to the second direction; and the contour of the second convex portion having a cross section substantially perpendicular to the extending direction of the second convex portion is a triangle And an axis 6 passing through both ends of each of the second convex portions is an X-axis at an orthogonal cross-section substantially perpendicular to a direction in which each of the plurality of first convex portions extends, and the x-axis is The upper portion passes through the center between the two ends and is orthogonal; the axis of the upper through-axis is not two axes, and the length of the X-axis of each of the first convex portions is set to ^, at the orthogonal section The outline shape of each of the above-mentioned convex portions is expressed in _〇475xWa$ 〇475χ', and satisfies the equation (3) 2Z(X): [Number 3] °·95χζ〇(χ)^ζ(χ ) ^ 1.〇5 χζ〇(χ)...(3) where 'in equation (3), z〇(x) satisfies the formula (4): [number 4] 153850.doc •(4) 201133042 2χ *> JNI (in equation (4), C2, C4, C6, C8, C10, CI2, C14, C16 are C2=0.762469824257553 > C4=0.298075662262927 'C6=-〇.559629338153661 'C8=0.896468280253265 ' Ci〇= -0.6 57164166213715 > C12=-〇.61 5 72641 8495985 ' Ci4=l.24515 1353938560, Ci6=-0.520559083769482; or C2=〇.828034790338647 > C4=〇.322164108625275 ' C6=-0.683409388408353 ' C8=l .221645232748140 ' C10=-l.204381259337210, C12=-0.140913871787724, C14=1.033110858219420, C16=-0.475388345540708; or C2=〇.908743053413473, C4=0.412136074245729, C6=-l.052244441109330 'C8=l.939746214284020 ' Ci〇=- 2.013300115231620 ' CI2=〇.074678489261357 ' C14=l.376932293623570 ' CI6=-0.680081068815946) » 6. The light control panel unit of claim 5, wherein the contour shape of each of the plurality of the second convex portions is An equilateral triangle with a roughly right angle. 7. The light control panel unit of claim 5 or 6, wherein the first light control panel comprises a transparent material, and each of the convex portions has a refractive index of 1.56 or more and 1.62 or less. 8. A surface light source device comprising: The light control panel unit according to any one of claims 5 to 7, wherein a plurality of light sources are disposed apart from each other and the light is supplied to the light control panel unit. 153850.doc -4- 201133042 - A transmissive type image display device comprising: a light control panel unit of any one of items 5 to 7; a configuration of leaving the configuration and transmitting light to the light control panel unit And a transmissive imaging display portion illuminated by light output from the plurality of light sources and passing through the light control panel unit. s 153850.doc