TW201142425A - Light control plate unit, area light source device, and transmissive image display device - Google Patents

Abstract

The present invention provides a light control plate unit, an area light source device, and a transmissive image display device, which are capable of adequately uniformly diffusing light from point light sources. An area light source device (10) comprises a plurality of point light sources (22), provided with a prescribed light distribution value; and a light control plate unit (20) that includes a first and second light control plate (301, 302). In the area light source device (10), a plurality of protrusion parts (331, 332) are positioned in parallel upon the upper faces (321, 322) of the two light control plates, and said protrusion parts (331, 332) extend in a single direction. The extension directions of the protrusion parts (331, 332) are approximately orthogonal. With the axis that traverses both ends of each cross-section of the protrusion parts (331, 332) designated the u-axis, and the axis that traverses the center between the ends thereof and is orthogonal to the u-axis designated the v-axis, the contour shape v(u) of the cross-section satisfies the formula 0.95v0(u) ≤ v(u) ≤ 1.05v0(u), wherein v0(u) satisfies formula (1), wherein wa is the length of the protrusions (331, 332) in the u-axis direction, 0.40wa ≤ ha ≤ 1.60wa, and -1.00 ≤ ka ≤ 0.25.

Description

201142425 VI. Description of the Invention: [Technical Field] The present invention relates to a light control panel unit, a surface light source device, and a transmissive image display device. [Prior Art] - As the direct type image display device 40 as an example of the transmissive image display device, as shown in FIG. 8, for example, a light source is widely used on the back side of the transmissive image display portion 1 The example of the transmissive image display unit 10 includes, for example, a liquid crystal display panel in which the linear polarizing plates 12 and 13 are disposed on both surfaces of the liquid crystal cell 11. As the light source 43, a linear light source such as a straight tube type cold cathode line tube or the like is disposed in parallel with each other and used. As the direct-type image display device 40, the light from the light source 43 is uniformly dispersed. The transmissive image display portion 10 can be uniformly illuminated. Therefore, the light source 43 and the transmissive image display portion are provided. One block light control panel 42 having a function of changing the light incident from the light source 43 side toward the side of the transmissive image display unit 10 on the opposite side is used (for example, refer to Patent Document 1: The light output from the light source 43 is emitted as the planar light by the light control plate 42. Therefore, the light source 43 and the light control plate 42 constitute the surface light source device 41. The prior art document patent document patent document 1: Japanese special Kaiping 7_198913 [Invention] The problem to be solved by the invention 154757.doc 201142425 In recent years, 'from the perspective of Lang Neng', the research has replaced the cold-tube tube with a straight tube type, and used the light-emitting diode as a light source. The body is usually a point light source, and the light emitting diode is used by a distributed arrangement. However, if the light control panel of the previous surface light source device is combined with a point light source such as a light emitting diode, In the case of the direct type image display device, the light from the point light source cannot be sufficiently uniform, and the image displayed by the transmissive image display unit becomes bright in the vicinity of the point light source and away from the point light source. Therefore, the object of the present invention is to provide a surface light source device, a light control panel unit, and a transmissive image display device which can sufficiently uniformly disperse light from a point light source. The surface light source device of the present invention comprises a plurality of point light sources, and the light control plate provided on the plurality of point light sources is earlier. The plurality of point light sources of the surface light source device of the present invention have the following light distribution characteristics. : When the maximum emitted light intensity is Imax, the exit angle corresponding to Imax is 7〇. or more and 8〇. In the range below, and (A) corresponds to the exit angle 〇. The outgoing light intensity is the work time ^ 1〇 satisfies 0.12xlmax^ I0^ 〇.2〇xImax (B) The exit light intensity is (I0+Imax)/2, and the exit angle is 6〇.〇 and 7〇«»c or less within the range and (C) ) The intensity of the emitted light is (i〇+imax)/4 Further, the light guide plate unit included in the surface light source device of the present invention has the first and second light control plates, and the light incident from the first surface can be located at a distance of 47.5 or more and 57.5. The second side of the opposite side of the first side exits, and 154757.doc md. 201142425

The control panel is arranged in the order of the i-th light control panel and the second light control panel as seen from the plurality of point light sources, and the i-th surface of the second light control panel faces the second surface of the light-reducing control panel, and the first light control panel The extending direction of the convex portion is substantially perpendicular to the extending direction of the convex portion of the second light control plate, and the convex portions of the first and second light control plates are orthogonal to the extending direction thereof. In the cross section, the axis passing through both ends of the convex portion is taken as the u-axis, and the axis passing through the center between the two ends and the axis orthogonal to the ^^ axis is taken as the ^^ axis, so that the length of the convex portion in the axial direction is When ^, the contour shape of the convex portion in the above cross section is represented by ¥(11) which satisfies the formula (1) in the case of .0.475, 41^〇.475~3. [number i] 〇-95v〇(u) ^ V(u) ^ 1.05v〇(u) (1) where, in equation (1), [number 2]

(In the formula (2), the ha system satisfies a constant of 0.40 wa or more and 1.60 wa or less, and the system satisfies a constant of -1.00 or more and 〇_25 or less). According to this configuration, the light output from the dot diaphragm having the light distribution characteristics is incident on the light control panel unit from the first surface side of the first light control panel, and is controlled from the second light by the i-th and second light control panels. The second side of the board is emitted. Each of the first and second light control plates included in the light control panel 154757.doc 201142425 has a plurality of the convex portions formed on the second surface. The convex portions of the first and second light control plates have a cross-sectional shape that satisfies the above formula (1), and the first and second light control plates can be used from the point light source. Light is converted into linear light, that is, light having a substantially uniform brightness in its extending direction. Further, the first and second light control plates are arranged such that the extending directions of the convex portions of the first and second light control plates are substantially orthogonal to each other. Therefore, the surface light source device can sufficiently uniformly disperse light from the point light source and emit it as planar light. In the surface light source device of the present invention, the first surface of each of the first and second light control plates can be substantially flat. The transmissive image display device of the present invention comprises: a plurality of point light sources; a light control panel unit disposed on the plurality of point light sources; and is disposed on the light control panel unit to be illuminated by light emitted from the light control panel unit And a transmissive image display portion that displays an image. Each of the plurality of point light sources of the transmissive image display device of the present invention has the following light distribution characteristics: when the maximum emitted light intensity is Imax, the emission angle corresponding to Imax is 70 〇 or more and 8 〇〇 or less. Within the range, and (a) corresponds to the exit angle of zero. When the intensity of the emitted light is 1 ,, 1 〇 satisfies 0.12xlmax^ I〇^ ^*2〇xImax (b) The outgoing light intensity is (i〇+imax)/2, and the exit angle is 6〇〇 or more and 7〇° In the following range, the outgoing light intensity of 'c and (c) is (I 〇 + Imax) / 4 is 47.5. Above and 57.5. Within the scope below. Further, the light control panel unit included in the transmissive image display device of the present invention has the first and second light control plates 'which can make the light incident from the first surface from the second side located on the opposite side of the first surface The surface is formed, and a plurality of convex portions extending in one direction and arranged side by side in a direction substantially orthogonal to the one of 154757.doc • 6 - 201142425 are formed on the second surface, and the first light control panel and the second light guide plate are formed. The light control panel is arranged in the order of the first light control panel and the second light control panel from the plurality of point light sources, and the first surface of the second light control panel faces the second surface of the first light control panel. The extending direction of the convex portion of the plate is substantially perpendicular to the extending direction of the convex portion of the second light control plate, and the convex portions of the first and second light control plates are extended in the direction in which they extend. In the intersecting cross section, the axis passing through both ends of the convex portion is referred to as a u-axis, and the axis perpendicular to the u-axis passing through the center between the ends of the u-axis is referred to as a v-axis, and the u-axis direction of the convex portion is made. When the length is %, the contour shape of the convex portion in the above cross section satisfies the formula (3) with -0.475, you ^11^〇.475\¥3 Expressed as 11). [Equation 3] 〇-95v〇(u) ^ v(u) ^ 1.05v〇(u) (3) where, in equation (3), [4]

(in the formula (4), 'hj satisfies a constant of 〇.4〇wa or more and 1.60wa or less, and the lanthanide system satisfies a constant of -1.00 or more and 0.25 or less). According to the transmissive image display device, light output from the point light source having the light distribution characteristics is incident on the light control panel unit 'from the first surface side of the third light control panel through the first and second light control panels It exits from the second surface of the second light control panel. Each of the first and second light control plates included in the light control panel unit has a plurality of the convex portions formed on the second surface. The 154757.doc 201142425 convex portion of each of the second and second light control plates has a cross-sectional shape that satisfies the above formula (3), and thus the first and second light control plates can be derived from the above. The light of the point source is converted into linear light, that is, light having a substantially uniform brightness in the direction in which it extends. Further, the first and second light control plates are arranged such that the extending directions of the convex portions of the first and second light control plates are substantially orthogonal to each other. Therefore, in the transmissive image display device, the light from the point light source can be sufficiently uniformly dispersed into the planar light, and the uniformly scattered planar light can illuminate the transmissive image display portion. The light control panel unit of the present invention has a second and second light control panel that allows light incident from the first surface to be emitted from the second surface on the opposite side of the second surface, and the second surface is formed in the second surface. A plurality of convex portions extending in a direction and arranged in parallel in a direction substantially orthogonal to the one direction. In the light control panel unit of the present invention, the second light control panel is located on the second light control panel, and the first surface of the second light control panel faces the second surface of the first light control panel, and the first light control panel has The extending direction of the convex portion is substantially perpendicular to the extending direction of the convex portion of the second light control plate, and the convex portions of the second and second light control plates are perpendicular to the extending direction thereof. The axis passing through both ends of the convex portion is referred to as a u-axis, and the axis perpendicular to the u-axis passing through the center between the ends of the u-axis is referred to as a v-axis, and the length of the convex portion in the u-axis direction is ^ In the above cross section, the outline shape of the convex portion is expressed by -5, 75 Wag 〇 45%, which satisfies the formula (5) v (u).

[Number 5J 0.95v〇(u) ^ v(u) ^ 1.05v〇(u) (5) where, in equation (5),

[Number 6J 154757.doc --V " ...(6)201142425 % (In the formula (6), the ha system satisfies the constant of 〇.4〇wa and below 1.60wa,] the system satisfies the constant greater than -0.15 and 0.25 or less) . According to this configuration, light incident from the first surface of the first light control panel is emitted from the second surface. Then, the light emitted from the second surface of the first light control panel is incident on the first surface of the second light control panel, and is emitted from the second surface of the second light control panel. Each of the first and second light control plates included in the light control panel unit has a plurality of the convex portions formed on the second surface. Each of the first and second light control plates has a convex portion having a cross-sectional shape that satisfies the above formula (5), and therefore the second and second light control plates can be used from the point light source. Light is converted into linear light, that is, light that is substantially uniform in its direction of extension. Further, the i-th and second light control plates are arranged such that the extending directions of the convex portions of the first and second light control plates are substantially orthogonal to each other. Therefore, the light control panel unit can uniformly disperse the light from the point light source uniformly and emit it as planar light. EFFECTS OF THE INVENTION A sufficient uniform light control panel unit and a transmissive image display from a point light source can be provided. According to the present invention, a surface light source device and apparatus which are dispersed one by one can be provided. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The same reference numerals are omitted to omit the description. The dimensional ratio or the equivalent ratio of the drawings may not be the same as 154757.doc 201142425. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing the configuration of an embodiment of a penetrating circular image display device of the present invention. Fig. 1 shows the display of the transmissive image display device 1 in an exploded manner. The transmissive image display device 1 includes a transmissive image display unit 1 and a surface light source device 20 disposed on the back side of the transmissive image display unit 1 in FIG. In the following description, as shown in Fig. 1, the direction in which the surface light source device 2A and the transmissive image display unit 10 are arranged is referred to as the x direction (plate thickness direction), and the two directions orthogonal to the x direction are referred to as X and y direction. The X direction and the y direction are orthogonal to each other. The example of the transmissive image display unit 1 is, for example, a liquid crystal display panel in which the linear polarizing plates 12 and 13 are disposed on both surfaces of the liquid crystal cell i i . At this time, the transmissive image display device 1 is a liquid crystal display device (or a liquid crystal television). The liquid crystal cell U and the polarizing plates 12 and 13 can be used by a user of the transmissive image display device 1 such as a liquid crystal display device. The liquid crystal cell 11 is 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-surface light source device. The surface light source device 2A includes a light diffusing plate unit (light control plate unit) 21 and a plurality of point light sources 22 disposed on the back side of the light diffusing plate unit 21 in Fig. 1 . The light diffusing plate unit 21 includes first and second light diffusing plates 30 and 302. The first and second light diffusing plates 30 and 302 are provided in the thickness direction (ζ direction) in the order of the first light diffusing plate 30 and the second light diffusing plate 302 as seen from the plurality of point light sources 22. The first and second light diffusing plates 30 and 302 constituting the light diffusing plate unit 21 have substantially the same planar viewing shape (the shape seen from the ζ direction), and are generally rectangular. The planar view shape of the first and second light diffusing plates 30!, 302, in other words, 154757.doc -10- 201142425 The planar view shape of the light diffusing plate unit 21 is sized to suit the purpose of the penetrating image display device 1 The mode size is selected. However, the size of the planar observation shape of the first and second light diffusing plates 30! and 302 is usually 250 mm x 440 mm or more, preferably 1020 mm x 800 mm or less. The shape of the first light 4 diffusing plate 30! and the second light diffusing plate 3'2 in plan view is not limited to the rectangular shape. However, as long as the following description has no special notice, the planar observation shape of the first light diffusing plate 30! and the second light diffusing plate 3〇2 will be described as a rectangular shape. The plurality of point light sources 22 can be arranged in accordance with the shape of the light diffusing plate unit 21 or the transmissive image display unit 10 in plan view. Fig. 2 is a view showing an example of the arrangement relationship of a plurality of point light sources. As shown in Fig. 2, the plurality of point light sources 22 can be arranged at equal intervals Lx in the x direction and at equal intervals Ly in the 丫 direction. In Fig. 2, as an example, a case where the interval Lx between the 乂 directions is larger than the interval Ly in the y direction is exemplified. However, the interval Ly can also be more than the interval

Lx is large, and the interval Lx and the interval Ly may be the same. As an example, the interval is. The distance between the light-emitting portions of the point light source 22 adjacent to the interval Ly is usually 1 〇 mm to 150 mm. The plurality of point light sources 22 may be arranged in a staggered lattice shape as shown in Fig. 3. Fig. 3 can be seen as a modification of the case of Fig. 2. Therefore, the interval between the X-direction and the y-direction of the point light source can be the same as in the case of Fig. 2. The interval between the point direction light source 22 and the y direction in Fig. 3 will be specifically described. The rectangular lattice shown in Fig. 2 can be regarded as a plurality of side-by-side y-directions including a plurality of point light sources 22 arranged in the 乂 direction. At this time, the zigzag staggered grid-like arrangement of Fig. 3 is such that a plurality of dots arranged in the y direction are arranged in the 154757.doc •11·201142425 adjacent light source columns in the light source row. Thus, the nn-direction shifts by half a cycle and is arranged. In the arrangement of Fig. 3, the distance between 1 and -, and the interval of y-universal is also the same as in the case of Figure 2. That is, the y-direction "Xing 2" can be regarded as being juxtaposed between the adjacent point-like light source columns in the y direction - ^ ^ ^ In Fig. 3, as an example, the display /, The above-mentioned point light in the y direction*'

Seven people _ 点 The point light source is connected in the X direction. In the case of a half cycle, but the upper and the other are interchanged. < Description of the middle direction and the y direction Fig. 4 is a view showing an example of the light distribution of the point light source of the surface light source device. The horizontal axis of Fig. 4 shows the exit angle β (.), and the vertical axis shows the normalized exit (four) degrees normalized by the maximum outgoing light intensity. In the present embodiment, θ = 0 corresponds to the ζ direction in Fig. 1 . The point light source 22 is a so-called side emission type light source. The point light source is exemplified by a light-emitting one. The point light source 22 has a light distribution characteristic (directing characteristic) satisfying the following conditions: • an exit angle Θ丨 when the maximum outgoing light intensity at which the intensity of the emitted light is maximum is Imax (hereinafter referred to as peak angle 9 丨) is in the range of 70. or more and 80 or less. • The intensity of the outgoing light from the front direction (the exit angle Θ is 〇. direction) to the peak angle θι is approximately monotonously increasing. When the intensity of the emitted light is 1 ,, 1〇 satisfies 〇.12xImax^I〇^〇.2〇xImax • The exit angle 92 of the emitted light intensity (Imax+I〇)/2 is 60. or more and 70. In the range. • The intensity of the emitted light is (Imax + IoV4, the exit angle θ3 is 47.5. Above and -12- 154757.doc

S 201142425 57.5. Within the scope below. In the light distribution characteristic illustrated in Fig. 4, the vertical axis normalizes the intensity of the emitted light, so the exit angle θι corresponding to Imax = l00000' is 76. 〇 is 0.14〇. At this time, (Imax+I0)/2=0.570, and the corresponding exit angle 02 is 66.5. . Further, the exit angle 03 corresponding to (Imax + I0) / 4 = 〇.285 ' is 52.5. . Thereby, the light distribution characteristics of the point light source 22 shown in Fig. 4 satisfy the above conditions. Fig. 5 is a perspective view showing the configuration of a light diffusing plate unit (light control panel unit). Referring to Fig. 5, the i-th and second light-diffusing sheets 30^3, which constitute the light-diffusing sheet unit 21, will be described. In Fig. 5, the j-th and second light-diffusing sheets 3, 3, and 3 are separated from each other for explanation. However, as will be described later, the second light diffusing plate 3〇2 may be provided on the first light diffusing plate 30丨 so as to be in contact with the first light diffusing plate 3〇. [First light diffusing plate] The first light diffusing plate 30 has a substantially flat lower surface (the first surface of the first light control panel) 3 1丨, and a plurality of convex portions are formed on the second light diffusing plate 3〇2 side. The convex portion (the convex portion of the first light control plate) 33 (the second surface of the first light control plate) 32! The plate-shaped body "However, the first light diffusion plate 3 〇 ι may also be according to the thickness It is in the form of a thin plate and a film. The convex portion 33 extends in the ¥1 direction (the first direction of the first light control plate) substantially parallel to the y direction, and the convex portions 33丨 are arranged side by side in the XI direction substantially orthogonal to the Y1 direction (first light control) The second direction of the board). The χι direction and the Y1 direction are preferably parallel to the X direction and the y direction, respectively, but may be deviated by ±10, for example, due to manufacturing errors or the like. about. The cross-sectional shape of the plurality of convex portions 33 is substantially the same between the convex portions 33^. In the extending direction of the convex portion 33, the cross-sectional shape is substantially uniform. Adjacent to the two convex parts, the end of the 33 illusion 1 in the 154757.doc 13 201142425 xi direction in the same position. The thickness di of the first light diffusing plate 3〇1 is the distance between the lower surface 31ι and the top 33bliz direction of the convex portion 33i, and the thickness seven is usually 0.5 mm to 5 mm. [Second light diffusing plate] The second light diffusing plate 3〇2 has a substantially flat lower surface (first surface of the second light control plate) 3h, and a plurality of convex convex portions are formed on the outer side (second light control) A plate-shaped body of the upper surface of the plate (the convex portion) 332 (the second surface of the second light control plate) 322. However, the second light diffusing plate 3〇2 may have a thin plate shape or a film shape depending on the thickness. The convex portion 332 extends in the X2 direction (the first direction of the second light control plate) substantially parallel to the X direction, and is arranged in the 丫 2 direction (the second direction of the second light control plate) which is substantially orthogonal to the X2 direction. . The X2 direction and the Y2 direction are preferably parallel to the x direction and the 丫 direction, respectively, but may be the same as in the case of the first light diffusing plate 3〇1, for example, by ±10 due to manufacturing errors or the like. about. The cross-sectional shape of the plurality of convex portions 332 is substantially the same between the convex portions 332. The shape of the cross section in the extending direction of the convex portion 33z is substantially uniform. The ends 33a2, 33aS of the adjacent two convex portions 332, 332 are positioned at the same position in the Y2 direction. The thickness of the second light diffusing plate 3〇2 is the distance between the lower surface 3丨2 and the top portion 33b2 of the convex portion 332 in the z direction, and the thickness 1 is usually 0.1 mm to 5 mm ° [convex portion] The second light diffusing plates 30 and 302 have the shape of the convex portions 33 and 332. The convex portions 33! and 332 have the first and second light diffusing plates 3A and 3〇2 disposed on the point light source 22 having the light distribution characteristics described with reference to FIG. The light of 22 is converted into a cross-sectional shape of linear light having substantially uniform brightness. The cross-sectional shape of the convex portions 33A and 332 will be described with reference to Fig. 6 . 154757.doc • 14- 201142425 Here, the convex portions 33A and 33z are referred to as convex portions 33 (1) or 2) unless otherwise specified. In Fig. 6, the direction orthogonal to the extending direction of the convex portion 33i is defined as the u-axis, and the uv coordinate system "corresponds to the convex portion 33iiu axis direction corresponding to the magic direction, and the v-axis direction corresponds to the z direction. The direction of the port axis with respect to the convex portion 332 corresponds to the Y2 direction, and the direction of the x-axis corresponds to the z direction. In the above uv coordinate system, the cross-sectional shape of the convex portion 33i has two ends 33ai and 33ai on the u-axis. The outline of the convex portion 33丨 satisfies the v(u) table of the formula (7) [number 7] 〇.95v〇(u) ^ v(u) ^ 1.05v〇(u) (7) , in (7), [8]

The length of the convex portion 33i in the 'wj^' u-axis direction in the formula (8). Ha corresponds to the maximum height of the convex portion 33i between the both ends 33ai and 33ai of the convex portion 33i, and the 匕 system satisfies a constant of 0.40 wa or more and 丨. 60% or less. That is, the lanthanoid system satisfies a constant of 0.40 or more and 1.6 Å or less. As long as it satisfies a constant of 4 〇〇 or more and 〇·25 or less, 'ka can satisfy a constant exceeding _〇 15 and 0.25 or less. The width wa of the convex portion 33i is usually 40 μm or more, preferably 250 μm or more, from the viewpoint that the formation of the convex portion 33i is easy, and the pattern due to the convex portion 33丨 is not easily visually recognized. Usually 8 〇〇μΐΠ or less 'preferably 450 μηι or less. Specific examples of the width Wa include 154757.doc 15 201142425 wa=410 μηι, Wa=4〇〇 μίη, and Wa=325 μιη. However, the value of % is not limited to this. Fig. 6 is an example of a cross-sectional shape of the convex portion 33i, and is exemplified by a shape in which the v〇(u)mv direction is only stretched by a specific multiple in a range satisfying the formula (7). At this time, the convex portion 33i has a contour line that is symmetrical with respect to the v-axis. The cross-sectional shape shown in Fig. 6 corresponds to VQ(u) in the case of ha/Wa = 0.55 and ka = _0.25. However, the cross-sectional shape of the convex portion 33i is as shown in Fig. 7, and when it is defined with respect to a certain width, the outline is represented by 〇.95v〇(u). 〇5vq(u) is the outline of the area between the outlines. In v 〇 (u) shown in Fig. 7, ha / wa = 0.55, ka = - 0.25 » According to the above description, the cross-sectional shape of the convex portion 33i is expressed by v(u) of the formula (7). However, considering the influence on the manufacturing error and the intensity distribution in the vicinity of the both end portions of the convex portion 33, the cross-sectional shape of the convex portion 33j is satisfied by -0.475%3$11$0.475~3 ( 7) <11) means that it can be. The range of ha/wa and 1<:3 is only required to satisfy the above range, but the distance between the adjacent two point light sources 22 is L, and the point from the light-emitting portion of the point light source 22 to the light diffusing plate unit 21 is made. When the distance between the surface of the light source 22 side (the lower surface of the first light diffusing plate 30 in Fig. 1 or Fig. 5) is D, the preferred ha/wa and 1<:3 with respect to L/D The scope is as shown in Table 1 below. The line shape of the L with respect to the convex portion 33丨 and the Lx corresponding to the surface of the convex portion 332 correspond to the contour shape of the convex portion 332. [Table 1] L/D ha/wa ka 2.25 or more is less than 2.75 0.40 or more and 1.10 or less - 1.00 or more and 0.10 or less 2.75 or less is less than 3.25 0.50 or more 1.30 or less - 1.00 or more and 0.15 or less 3.25 or more and less than 3.75 0.55 or more and 1.40 or less - 1.00 or more and 0.20 or less, 3.75 or more, less than 4.25, 0.60 or more, 1.60 or less, 1.00 or more, 0.25 or less, 154757.doc -16·201142425, the convex portion 33丨 of the first light diffusing plate 30! and the convex portion of the second light diffusing plate 3〇2 The part 332, wa, ha, ka may be the same or different. In other words, the convex portion 33 of the first light diffusing plate 3〇 and the convex portion 332 of the second light diffusing plate 3〇2 may have the same cross-sectional shape in each of the cross-sectional shapes of the respective convex portions 33丨 and 332. The contour line satisfies the range of the above formula (7), and may have different cross-sectional shapes. [Layer configuration of the first and second light diffusing plates] The first and second light diffusing plates 3 (h, 3〇2 may be single-layered plates made of a single transparent material) may be laminated to be different from each other. A multilayer board having a multilayer structure of a layer made of a transparent material. In the case where the first and second light diffusing plates 3 (wherein ^, 302 are multilayer boards, one side of the first and second light diffusing plates 3〇1, 3〇2) Or the surface of the outer layer is preferably formed to have a thickness of 10 μm to 200 μm, preferably 20 μm to 1 μm. In this case, as a transparent resin material constituting the outer skin layer, an ultraviolet absorber is added. According to this configuration, it is possible to prevent deterioration of the first and second light diffusing plates 30! and 3〇2 due to a certain ultraviolet light contained in the light from the point light source 22 or the outside. In the case where the proportion of the ultraviolet light source is relatively large, the ultraviolet light is prevented from being deteriorated. Therefore, it is preferable to form the outer skin layer on the lower surface 31, 312, and the outer skin layer is not formed on the upper surfaces 321 and 32, thereby saving The cost is further improved. As a transparent resin material constituting the outer skin layer, it is used. In the case where the ultraviolet absorber is added, the content of the ultraviolet absorption amount is usually 0.5% by mass to 5% by mass based on the transparent resin material, preferably Μ% by mass to 25% by mass. 2The anti-static agent is applied to one side or both sides of the light-diffusing sheet 3〇1, 3〇2. By coating the antistatic agent, it can be prevented from being prevented by the electric power supply, such as the 154757.doc -17- 201142425 The light transmittance due to adhesion of dust is lowered. [Constituent material] The first and second light diffusing plates 3〇丨 and 3〇2 are made of a transparent material. The refractive index of the transparent material is usually i.56 to 1.62. Examples include a transparent resin material and a transparent glass material. Examples of the transparent resin material include a polycarbonate resin (refractive index·· 1.59) and an MS resin (yttrium methacrylate styrene copolymer resin) (refractive index: 1.56~) 1.59), polystyrene resin (refractive index: 1.59), AS resin (acrylonitrile-styrene copolymer resin) (refractive index: 1.56 to 1.59), etc. Preferred examples of the transparent resin material in terms of cost and moisture absorption rate The lower point is polystyrene resin. In the case of using a transparent resin material as the transparent material, an additive such as an ultraviolet absorber, an antistatic agent, an antioxidant, a processing stabilizer, a flame retardant, a lubricant, or the like may be added to the transparent resin material. These additives may be used alone or in combination. Examples of the ultraviolet absorber include a benzotriazole-based ultraviolet absorber, a benzophenone-based ultraviolet absorber, a cyanoacrylate-based ultraviolet absorber, a malonate-based ultraviolet absorber, and a grassy diphenylamine. The ultraviolet absorber, the triazine-based ultraviolet absorber, etc. Preferred examples of the ultraviolet absorber are a benzotriazole-based ultraviolet absorber and a triazine-based ultraviolet absorber. The transparent resin material is usually used without adding a light diffusing agent as an additive. However, a light diffusing agent may be added if it does not significantly impair the purpose of the present invention. As the light diffusing agent, a powder having a refractive index different from that of the above-mentioned transparent material mainly constituting the first and second light diffusing plates 30A and 3B2 is usually used. This •18· 154757.doc

201142425 / Light diffusing agent is used in dispersion in transparent materials. Examples of the light diffusing agent are inorganic particles such as stupid vinyl resin particles and methacrylic resin particles, stone anti-slag particles, silica dioxide particles, and iron oxide ketone resin particles. The particle size of the light diffusing agent is usually from 0.8 μm to 50 μm. In order to reduce the effect of the unknown light 1, the surface on the side of the point light source 22 may be a surface having light diffusibility. For example, the outer layer of the fine particles called the atomizing agent may be formed on the side of the point light source 22, and the surface of the point light source 22 may be embossed or embossed, or may be coated with an atomizing agent and a drill. The coating liquid of the mixture forms an atomized layer. [Method of Manufacturing First and Second Light-Diffusing Plates] The first and second light-diffusing sheets 3 〇 i and 3 〇 2 can be produced by, for example, a method of cutting out a transparent material. In the case where a transparent resin material is used as the transparent material, the first and second light diffusing plates 3 〇, 3 〇 2 can be, for example, a general method such as an injection molding method, an extrusion molding method, a photopolymer method, or a press molding method. Manufacturing 0 [Arrangement relationship between the first and second light diffusing plates] The first and second light diffusing plates 3〇, 3〇2 are sequentially provided in the z direction. The lower surface 3丨2 of the second light control panel 3 〇2 faces the upper surface 32 of the first light control panel 30. The second and second light diffusing plates 30 and 3 are arranged such that the extending direction (γι direction) of the convex portion 33 is substantially orthogonal to the extending direction (Χ2 direction) of the convex portion 332. An example of an angle formed between the extending direction of the convex portion 33 and the extending direction of the convex portion 332 is 80. ~100. Preferably, it is 90. . The distance between the first and second light diffusing plates 30! and 3〇2 is the top 33b of the convex portion 33丨 of the first light diffusing plate 30丨 and the lower 3h of the second light diffusing plate 3〇2 154757 .doc -19· 201142425 The distance in the Z direction. The distance d, 2 is less than 5 mm. From the viewpoint of making the light diffusing plate unit 21 small, the first light diffusing plate 3〇 convex portion 33! can be placed in contact with the lower surface 312 of the second light diffusing plate 3〇2. 2 light diffusing plates 30丨, 3〇2. At this time, d12 is 0 mm. In the case where the second light diffusing plate 3〇2 is placed in contact with the first light diffusing plate 3〇1, the thickness 1 of the second light diffusing plate 3〇2 is larger than that of the first light diffusing plate 3〇. Thickness of 1 is thin. * For example, in the case where the second light diffusing plate 3〇2 is thinner than the film shape, the first light diffusing plate 30丨 can be used as a support for the second light diffusing plate 3〇2. [Arrangement of Light-Diffusing Plate Units] The light-diffusing sheet unit 21 having the first and second light-diffusing sheets 3 and 302 having the above-described configuration is disposed on the point light source 22 so as to be from the point light source 22 to the j-th light The distance D of the lower surface 31 l of the diffuser plate 30 is generally 3 mm to 5 mm. In the transmissive image display device 1 or the surface light source device 2, Lx, Ly, and the Lx/D and Ly/D are respectively 2 or more. Further, a value of 2.5 or more is preferable in that the surface light source device 20 can be made thin. In the transmissive image display device 1, the light diffusing plate unit 21 may be disposed such that the extending direction of the convex portion 33 is in the longitudinal direction of the screen, or may be arranged in the lateral direction. In the case where the light diffusing plate unit 21 is disposed such that the extending direction (γ1 direction) of the convex portion 33 of the first light diffusing plate 30 is in the lateral direction of the screen, the convex portion of the second light diffusing plate 3〇2 The extending direction of 332 (χ2 direction) corresponds to the longitudinal direction of the screen. In such a configuration, from the viewpoint of suppressing unevenness in luminance when viewed from the oblique lateral direction, the equation (8) with respect to the convex portion 332 is compared with I54757.doc • 20· 201142425

The ratio of Wa [R, ha/Wa] is smaller than that of the convex portion 33, and the ha and w乂 ratio [R] = ha / wa of the formula (8) is relatively small, and the formula (8) with respect to the convex portion 332 is preferable. It is preferable that the formula (8) is smaller than the convex portion 33. Further preferably, it is a transmissive image display device! In the arrangement of the point light sources 22, the dot-like light sources 22 in the longitudinal direction of the screen are equally spaced or larger than the dot-like surfaces and 22 in the lateral direction. When the money dispersing unit 21 is disposed such that the direction in which the convex portion 331 of the first light diffusing plate 3〇1 extends in the longitudinal direction of the screen, the extension of the convex portion 332 of the second light diffusing plate 3〇2 The direction (χ2 direction) corresponds to the horizontal direction of the screen. In such a configuration, the ratio of ha to ^ [Ri=ha/Wa] of the equation (8) with respect to the convex portion 33 is compared with respect to the luminance unevenness when viewed from the oblique lateral direction. The formula (8) of the convex portion 332 and the second [R2=ha/wa] are small (four), and the formula (8) with respect to the convex portion 33 is preferably smaller than the formula (8) ua of the convex portion 332. Further, in the arrangement of the point light sources 22 of the transmissive image display device i, the interval Lx of the spot light sources 22 in the longitudinal direction of the screen is equal to or larger than the interval Ly of the point light sources 22 in the lateral direction. Next, the effect of the 'light diffusing plate unit 21, the surface light source device 2', and the transmissive image display device 10 is as shown in Fig. i, and the surface light source device 20 including the light diffusing plate unit 21 is applied to the penetrating type. The case of the image display device i will be described as an example. Here, the X1 direction and the X2 direction are parallel to the χ direction, and the γι direction and the Y2 direction are parallel to the y direction. The first and second light diffusing plates 3〇1 and 3〇2 included in the light diffusing plate unit 21 are formed with convex portions 33 and 332 on the upper surfaces 321 and 322, and thus the first and second 154757.doc 21 201142425 The light diffusing plates 30! and 3〇2 can respectively convert the light from the point light source 22 into linear light having a substantially uniform luminance distribution. In the light diffusing plate unit 21, the first and second light diffusing plates 30, 3〇2 are arranged such that the convex portions 33 are substantially orthogonal to each other. As a result, the light from the plurality of point light sources 22 is converted into planar light by the light diffusing plate unit 21. The first and second light diffusing plates 30 and 302 are configured to convert light from the point light source 22 into linear light, that is, light having a substantially uniform brightness in the extending direction. Therefore, the light of the point light source 22 from the complex number is uniformly dispersed by the light diffusing plate unit 21, so that the light diffusing plate unit 21 can generate the planar light having higher uniformity of brightness on the plane orthogonal to the z direction. . Since the surface light source device 20 includes the light diffusing plate unit 21, the surface light source device 20 can uniformly disperse light from the plurality of point light sources 22, and emit planar light having a higher uniformity of brightness on the plane orthogonal to the z direction. . The transmissive image display device 1 includes the above-described light diffusing plate unit 21. Therefore, in the transmissive image display device 1, the light of the point light source 22 from the complex number is uniformly dispersed, and the surface light having a uniform brightness uniformity on the plane orthogonal to the z direction is irradiated. Transmissive image display unit 10. As a result, the transmissive image display device 1 can display a higher quality image. The embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments. According to the above embodiment, the arrangement example of the plurality of point light sources 22 is shown in Figs. 3 and 4, but may be, for example, a square lattice, i.e., the interval between the point light sources 22 adjacent in the χ direction and the y direction is the same. . The end 33ai of the cross-sectional shape of the adjacent convex portion 33i (i system 1 or 2) is overlapped in the direction in which the convex portions 33ai are arranged, and the end of the convex portion 33i (i system 1 or 2) adjacent to the ❻ is described. A small flat portion can also be produced between 33^ (for example, I54757.doc •22·201142425 by manufacturing error). The light diffusing plate unit 21 may have an optical film such as a diffusion film or a microlens film on the side of the transmissive liquid crystal display unit 1 (for example, on the liquid crystal panel side). The transmissive image display device may be configured as a light diffusing plate. The unit 21 and the transmissive liquid crystal display portion 10 further have an optical film such as the above-described diffusion film or microlens film. Surface light source device 20 or transmissive image display device! A reflection mechanism for reflecting the light output from the point light source 22 to the reflection plate on the side of the light control panel unit 2 may be provided. In the schematic diagram shown in FIG. ,, as long as the point light source 22 is disposed on the opposite side of the light diffusing plate unit (light control panel unit) 21, the example of the reflecting mechanism can be used to maintain the point light source. The light source mounting surface of the holding member of 22 serves as a reflecting surface. As an example, the first and second light control plates have described the first and second light diffusing plates 30! and 3〇2'. However, the first and second light control plates may be formed such that light is deflected toward the exit surface side. The convex portion 33 or the convex portion 332 of the light is dispersed in various directions to the structural plate. The first and second light control plates are formed such that the light output from the plurality of point light sources is more uniformly dispersed to generate linear light, and the convex portion 33 or the convex portion 332 is formed on the light emitting side. Optical components are all right. In this case, the light control panel unit may be arranged such that the two optical elements are substantially orthogonal to each other in the direction in which the convex portions 33! or the convex portions 332 extend. Further, although the light control plate has been described as a plate shape, it also includes a film-shaped light control film and a thin plate-shaped light control sheet corresponding to the thickness. 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; I54757.doc -23- 201142425 FIG. 2 is a view showing an example of arrangement of a point light source. FIG. 3 is a view showing another example of the arrangement of the point light source; FIG. 4 is a view showing an example of the light distribution of the point light source used in the transmissive image display device shown in FIG. 5 is a perspective view showing an example of the light control panel unit shown in FIG. 1. FIG. 6 is a view showing a sectional shape of a convex portion of the second and second light control panels of the light control panel unit shown in FIG. FIG. 7 is a view showing a condition that the cross-sectional shape of the convex portion satisfies; and FIG. 8 is a cross-sectional view schematically showing the configuration of the previous transmissive image display device. [Main component symbol description]

S 1 transmissive image display device 10 transmissive image display unit 20 surface light source device 21 light diffusing plate unit (light control panel unit) 22 point light source 33al end of convex portion (convex of first light control plate) End of the portion) 33a2 End of the convex portion (end of the convex portion of the second light control plate) 33al End of the convex portion (end of the convex portion of the first and second light control plates) 33, convex Part (the convex part of the first and second light control plates) 3〇, the first light diffusing plate (first light control plate) 3〇2 The second light diffusing plate (second light controlling plate) 31ι The first light diffusing The lower surface of the plate (the first surface of the first light control plate) 312 The lower surface of the second light diffusion plate (the first surface of the second light control plate) I54757.doc • 24· 201142425 32, the top of the first light diffusing plate ( The second surface of the first light control plate 322 The upper surface of the second light diffusion plate (the second surface of the second light control plate) 33 ι The convex portion of the first light diffusion plate (the convex portion of the first light control plate) 332 The convex portion of the second light diffusing plate (the convex portion of the second light control plate) ' XI and the direction substantially orthogonal to the Y1 direction - X2 The extending direction of the convex portion of the second light control plate Y1 1 The direction in which the convex portion of the light control plate extends Y2 is substantially orthogonal to the direction of X2 154757.doc •25-

Claims (1)

201142425 VII. Patent application scope: 1. A surface light source device, comprising: a plurality of point light sources; and a light control panel unit disposed on the plurality of point light sources; • a plurality of the above point light sources having the following Light characteristics: - When the maximum outgoing light intensity is Imax, the exit angle corresponding to the aforementioned Imax is 70. Above and 80. In the following range, when the intensity of the outgoing light corresponding to the exit angle of 0° is 1 ,, the above 1〇 satisfies the emission of 〇-12xImax^I〇^0.2〇xImax (I〇+Imax)/2 The angle is at 6 inches. Above and 70. In the following range, and the outgoing light intensity (I 〇 + Imax) / 4, the exit angle is 47.5. Above and 57.5. In the following range, the light control panel unit has first and second light control plates that allow light incident from the first surface to be emitted from the second surface located on the opposite side of the first surface, and The second surface is formed with a plurality of convex portions extending in one direction and arranged in parallel in a direction substantially orthogonal to the one direction; the first light control plate and the second light control plate are plural from the aforementioned point. The first light control panel and the second light control panel are arranged in the order of the first light control panel; the first surface of the second light control panel faces the second surface of the first light control panel; and the first light control panel The extending direction of the convex portion is orthogonal to the extending direction of the convex portion of the second light control plate, which is substantially 154757.doc 201142425; and each of the first and second light control plates In the cross section orthogonal to the extending direction of the convex portion, the axis passing through both ends of the convex portion is referred to as a u-axis, and the axis on the u-axis passing through the center between the both ends and the u-axis is defined as the V-axis. , setting the aforementioned u-axis direction of the convex portion 2 When the length is wa, the contour shape of the convex portion in the cross section is represented by v(u) of -0.475waS us 〇.475waf which satisfies the formula (1); [Number 1] 〇.95v〇(u) ^ V(u ^ ^ 1.05v 〇 (u) ... (1) where, in the above formula (1), [number 2] f \3 abuse _ BAfl — VM: K--. - /.. (2) 2) The middle 'ha system satisfies the constant of 〇·4〇Wa and 1.60 wa or less, and 1^ is a constant of -1.00 or more and 0.25 or less). 2. The surface light source device of claim 1, wherein the first surface of each of the first and second light control plates is substantially flat. 3. A transmissive image display device comprising: a plurality of point light sources; a light control panel unit disposed on the plurality of point light sources; and a light control panel unit disposed on the light The penetrating image display portion that displays the image by the light emitted from the control panel unit; 154757.doc -2· S 201142425 The above-mentioned respective point light sources have the following light distribution characteristics: » When the maximum emitted light intensity is Imax The exit angle corresponding to the aforementioned Ια is 70. Above and 80. Within the following range, and corresponding to the exit angle 〇. When the intensity of the emitted light is 1 ,, the above 1〇 satisfies 0.12><ImaxS 〇2〇ximax, and the outgoing light intensity of (I〇+Imax)/2 is in the range of 6〇〇 or more and 7〇0 or less. The exit angle of the inside and the outgoing light intensity (I0+Imax)/4 is 47 5 . Above and 57.5. In the following range, the light control panel unit has a second and second light control panel that allows light incident from the first surface to be emitted from the second surface located on the opposite side of the second surface, and is in the second The surface is formed with a plurality of convex portions extending in one direction and arranged in parallel with the substantially positive direction of the one direction; the first light control plate and the second light control plate are seen from a plurality of the point light sources. Arranged in the order of the light control panel and the second light control panel; the second surface of the second light control panel faces the second surface of the third light control panel; and the first light control panel The extending direction of the convex portion is substantially perpendicular to the extending direction of the convex portion of the second light control plate, and the convex portions of the first and second light control plates are a section perpendicular to the extending direction thereof, wherein the axis passing through both ends of the convex portion is a u-axis, and the u-axis is orthogonal to the u-axis by a center 154757.doc 201142425 between the both ends The shaft is a V-axis, and the convex portion is provided When the length of the u-axis direction is wa, the contour shape m'475Wa$ M75wa of the convex portion in the section of #, +, _月1J is expressed by V(u) satisfying the formula (3); [Number 3] 0.95 V〇(u)^v(u)^1.〇5v〇(u) (3) where, in the above formula (3), [number 4] vM-ha^ II (In the formula (4), the ha system satisfies the constant of 〇·4〇 Wa or more and 丨6〇 Wa or less, and the ka system satisfies the constant of -1.00 or more and 〇25 or less). A light control panel unit having a second and second light control panel that allows light incident from the first surface to be emitted from a second surface located on the opposite side of the second surface, and formed on the second surface a plurality of convex portions extending in one direction and arranged side by side in a direction substantially orthogonal to the _ direction; the second light control plate is located on the first light control plate; and the second light control plate is not described above The first surface faces the second surface of the first light control plate; the extending direction of the convex portion of the first light control plate is substantially the same as the extending direction of the convex portion of the second light control plate In the cross section orthogonal to the extending direction of each of the convex portions of the first and second light control plates, the axis 154757.doc S 201142425 passing through both ends of the convex portion is referred to as a U-axis. The above-mentioned U-axis passes through < , 剐 between the two ends, and the axis orthogonal to the axis as the v-wheel, and the phase * and the length of the convex portion toward the u π are Wa. The U-axis can be returned to the contour of the convex portion to -0.475waS G 〇.475w v(8) satisfying the formula (7) in a; '[Number 5] 0.95v〇(u) ^v(u) S 1.05v〇(u) (5) where, in the above formula (5), [6] v 〇(«) = \ — 8A, (V »· · · (6) (In the formula (6), the 'ha line satisfies 0_40 wa or more and the constant below l6〇wa' 1 ^ system satisfies greater than -0.1 5 and 0.25 or less Constant) ° 154757.doc