WO2007049618A1 - Light diffusion plate and direct backlight device - Google Patents

Light diffusion plate and direct backlight device

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Publication number
WO2007049618A1
WO2007049618A1 PCT/JP2006/321169 JP2006321169W WO2007049618A1 WO 2007049618 A1 WO2007049618 A1 WO 2007049618A1 JP 2006321169 W JP2006321169 W JP 2006321169W WO 2007049618 A1 WO2007049618 A1 WO 2007049618A1
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WO
Grant status
Application
Patent type
Prior art keywords
light
surface
linear
sin
xj
Prior art date
Application number
PCT/JP2006/321169
Other languages
French (fr)
Japanese (ja)
Inventor
Kenji Kusano
Original Assignee
Zeon Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/02Diffusing elements; Afocal elements
    • G02B5/0205Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0226Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures having particles on the surface
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/02Diffusing elements; Afocal elements
    • G02B5/0205Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0231Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/02Diffusing elements; Afocal elements
    • G02B5/0268Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/02Diffusing elements; Afocal elements
    • G02B5/0273Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278Diffusing elements; Afocal elements characterized by the use used in transmission
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of optical devices, e.g. polarisers, reflectors or illuminating devices, with the cell
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight

Abstract

Disclosed are a light diffusion plate improved in luminance and luminance uniformity, and a direct backlight device. Specifically disclosed is a light diffusion plate for diffusing the light from a light source, which comprises a light incident surface through which the light from the light source enters and a light emitting surface through which the incident light is diffused and emitted. This light diffusion plate is characterized in that the light incident surface is a generally flat surface while the light emitting surface has a prism array having a plurality of linear prisms of a specific shape having a projected or recessed cross section. Also specifically disclosed is a direct backlight device characterized by comprising such a light diffusion plate.

Description

Specification

Light diffusing plate and the direct-type backlight device

Technical field

[0001] The present invention relates to an optical diffusing plate and the direct-type backlight device. More particularly, the present invention relates to an optical diffusing plate and the direct-type backlight device having high brightness high tool luminance uniformity ratio. BACKGROUND

[0002] The backlight device for a liquid crystal display, a cold cathode tube and the light source and the device is widely used, there is a method called a direct type and a method called edge light type. Edge-light type device becomes configured force arranged cold cathode tubes tubules end side of the light guide plate, the light incident end surface forces repeatedly reflected within the light guide plate, a device for exiting the light guide plate main surface. On the other hand, the direct type backlight device, combining juxtaposed the cold cathode tube a plurality of the (linear light source), a reflecting plate provided on the back of the cold cathode tube, a light diffuser plate forming the light-emitting surface structure force also. Direct type device, in contrast to the edge light type device, in order to be able to increase the use number of the cold cathode tube, it is possible to easily high brightness light-emitting surface.

[0003] However, in the direct type of device periodically Brightness unevenness by the luminance is high at just above the cold cathode tube is caused, there is a problem that the uniformity ratio of luminance of the light emitting surface is poor. Therefore, evil luminance uniformity ratio of the device emitting surface!, Particularly due, the display no al on the display screen of the liquid crystal display occurs, there is cormorants problem.

[0004] In the direct type of device, although it is possible to improve the brightness uniformity by reducing the distance between the cold cathode tubes, not must increase the number of cold cathode tubes Therefore, power consumption during lighting there is a problem that rises. Although it improves the even luminance uniformity ratio and large child distance of the cold cathode tubes and the light diffusion plate, in which case the device will be thicker summer, Do can realize a reduction in thickness of the liquid crystal de Isupurei referred problems was there.

[0005] Furthermore, conventionally, in the direct type of apparatus, in order to improve the brightness uniformity have been various countermeasures are such. For example, a stripe pattern or dot-shaped light amount correction pattern is printed on the light diffusion plate, a method of reducing the light flux emitted right above the cold cathode tube (Patent Document 1: JP-A-6 273 760) and wave using the mold reflector technique for focusing the reflected light from the reflecting plate to the area corresponding to the middle of the cold cathode tube and a cold cathode tube (Patent Document 2: JP 2001- 174813 JP) has been proposed .

[0006] However, as means for improving luminance uniformity ratio, when the printing of the light amount correction pattern, since the blocking part of the light beam, reduces the utilization rate of the light beam CCFL emits, sufficient luminance is obtained there is a problem that is not. Moreover, the use of corrugated reflector, there is a problem that construction of the apparatus becomes complicated.

[0007] Further, the light diffusion plate used in the direct type, although dispersed material a light diffusing agent in a transparent resin is often used, the concentration of the light diffusing agent in order to improve the luminance uniformity ratio raising the luminance is disadvantageously lowered. This was a pattern of prisms such as the light diffusion plate surface in order to solve, that to have a diffusion effect by the surface shape without decreasing the brightness has been proposed (Patent Document 3, 4, and 5 ( each Hei 5 3333 33 and JP Hei 8 297 202 and JP 2000 - 182418 Patent publication)). However, the light diffusion plate surface simply by forming a prismatic pattern, improvement in the uniformity ratio of luminance was not enough.

Disclosure of the Invention

Problems that the Invention is to you'll solve

[0008] An object of the present invention is to provide a light diffusion plate and the direct backlight device in which the luminance and the uniformity ratio of luminance is improved.

Means for Solving the Problems

[0009] The present inventors have solved the above problems surgical instrument detailed study the results of, surprisingly, the direct type back in the write apparatus, cross serrated prisms on the light emitting surface of the light diffuser plate Do only providing the ridges sufficient effect of luminance uniformity ratio improved, but by the prism array with a specific shape, and it Mii that luminance uniformity is good device can be obtained with high luminance. Pair particular, cross serrated, in other words, to some extent be configured aligned plurality of triangular cross section of the linear prism though it is possible to increase the luminance uniformity ratio, within a predetermined range, which is inclined by the same angle in opposite directions to each other the surface by providing two or more sets, see that it is possible to further enhance the luminance uniformity Hitoshido, however.

[0010] That is, according to the present invention, there is provided the following: (1) a light incident surface which light enters, and the light incident surface is formed on the opposite side, the light incident surface force an optical diffusing plate and a light emitting surface that emits the diffuse incident light, the light incident surface is substantially flat planar surface, to the light exit surface, cross-sectional concave or convex multi comprising a prism array having a plurality of triangular linear prisms, each linear prism, which has four or more faces, polygons its sectional shape, line symmetry of normal line of the light entrance surface as an axis light diffusion plate, which is a shape.

[2] and a plurality of linear light sources arranged in parallel, a reflection plate for reflecting light from the linear light source, and emits the diffused light incident from the linear light source and the reflector (1) type backlight device, characterized in that it comprises a light diffuser plate described.

[3] A direct-type backlight device according to [2], the light diffuser plate is configured to include a transparent 榭 fat, each linear prism, based on the normal line of the light incident surface, a first surface group having a plurality of surfaces which are inclined to one side, and a second surface group having a plurality of surfaces which are inclined in opposition side of the surfaces constituting the first planes , in each of the second planes and said first planes, the number of the S number, the surface and successively a first surface, respectively from those angle is small and the light incident surface of the surface, the second face, and · · · the S plane, the angle of Xj (°) between the light incident surface and any j-th surface, the linear light sources and the second in the j-th surface force closest position distance between distance W (mm), the distance a (mm) between the center and the light incident surface of the linear light source, the central light incident surface of the j-th surface between the linear light source in close A release bj (mm), the angle Y (°) between the longitudinal direction and the linear light source of the linear prisms, wherein the refractive index of the transparent resin eta, of the first planes and the second planes in at least one group, it holds the relationship of equation (1) in the case of J≥2, direct-type backlight device, wherein the equation (2) holds in the case of j = l.

[Number 1]

Wx (2 X j- 3) / (4xS) ≤

(axtan (sin- 1 (nxsin ( Xj - sin- 1 (sin (Xj) / n)))) + bjxtan (X j- sin- 1 (sin (Xj) / n))) xcos (Y) ≤WX (2 X j + l) / (4xS)

(1)

[Number 2] 0≤

(axtan (sin- 1 (nxsin ( X j- sin- 1 (sin (Xj) / n)))) + bjxtan (X j - sin 1 (sin (Xj) / n))) xcos (Y) ≤WX (2 X j + l) / (4xS)

(2)

[4] A light diffusion plate for emitting diffuse light in the linear light source power, the surface opposite to the light incident surfaces which light enters and the light incident surface from the linear light source It is formed, and a light emitting surface for emitting diffuse light incident from the light incident surface, the light incident surface is substantially flat planar surface, to the light exit surface, concave cross section or a convex comprising a prism array having a plurality of Jo polygonal linear flop rhythm, the polygon is a line symmetrical shape with the axis of the normal line of the light incident surface, the prism array is shaped together containing different types of the linear prisms, of the linear prism longitudinal direction vertical, in and a direction parallel to the light incident surface, within the width of the linear light source, the plurality of types light diffuser plate which comprises all types of linear prisms.

[5] and a plurality of linear light sources arranged in parallel, a reflection plate for reflecting light from the linear light source, and emits the diffused light incident from the linear light source and the reflector (4) type backlight device, characterized in that it comprises a light diffuser plate described.

[6] A direct-type backlight device according to [5], configuration wherein the light diffusion plate is configured to include a transparent 榭 fat, wherein each linear prism comprises at least two inclined surfaces made, the kind of slopes are included in all of the linear prisms and S species, the slope and turn each of the first inclined surface from what angle is small with the previous SL light incident surface, the second inclined surface, · · · the and S slant, the angle between the light incident surface and any j-th j slope and Xj (°), from the first j slope, the linear light source and the second which is located closer to the first the distance between the linear light source and W (mm) in the position close to the distance between the center and the light incident surface of the linear light source and a (mm), the centering of the j-th slope the distance between the light incident surface and bj (mm), the angle between the longitudinal direction of the longitudinal direction as the linear light source of the linear prisms Y ( ), And the transparent refractive index of the resin and eta, holds the relationship of Equation (1) in the case of J≥2, direct type back if the j = l, characterized in that the equation (2) is satisfied write device.

[Number 3] Wx (2 X j- 3) / (4xS) ≤

(axtan (sin- 1 (nXsin ( Xj- sin- 1 (sin (Xj) / n)))) + bjxtan (Xj- sin one 1 (sin (Xj) / n ))) Xcos (Y) ≤WX ( 2X j + l) / (4xS)

(1) picture 0≤

(axtan (sin- 1 (n sin (X j-sin one 1 (sin (Xj) / n )))) + bjxtan (Xj- sin- 1 (sin (Xj) / n))) xcos (Y) ≤ WX (2X j + l) / (4xS)

(2) Effect of the Invention

[0011] direct-type backlight device of the present invention comprising a light diffusion plate of the present invention, simple drawings luminance and luminance uniformity Hitoshido is useful as a high tool Roh backlight or the like of a display device such as a liquid crystal display described

[0012] [FIG 1] FIG 1 is a longitudinal sectional view showing an example of an optical diffusing plate and the direct-type backlight device of the present invention.

FIG. 2 is a longitudinal sectional view showing another example of the light diffusion plate of the present invention.

FIG. 3 is a longitudinal sectional view showing still another example of the light diffusion plate of the present invention.

FIG. 4 is to illustrate the significance of Equation (1) to (3), is a schematic longitudinal sectional view showing a light diffusion plate and the linear light source in the direct-type backlight device of the present invention .

FIG. 5 is a partial enlarged cross-sectional view showing an example of a region 50 in FIG. 4.

[6] FIG. 6 is a vertical sectional view shows the another example of the light diffusion plate and the direct-type backlight device of the present invention.

[7] FIG. 7 is a longitudinal sectional view showing still another example of the light diffusion plate of the present invention.

FIG. 8 is in direct-type backlight device of the present invention, it is a perspective view illustrating a light diffusion plate, the outline of the relationship between the linear light source and the anti-radiation plate.

[9] FIG. 9 is a partial enlarged cross-sectional view showing another example of a region 50 in FIG. 4.

[10] FIG 10 is a cross sectional view showing an example of the cross-sectional shape of the linear prism of the light diffusion plate of the present invention.

[11] FIG 11 is a view to a cross-sectional view of another example of the cross-sectional shape of the linear prism of the light diffusion plate of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

[0013] Light diffusion plate of the present invention includes a light source, a light diffusion plate for especially diffuse light from the linear light source. The linear light source can be used a cold cathode tube, a hot cathode tube, LED arranged in a linear combination of the LED and the light guide and the like. At this time, the cold-cathode tubes or hot cathode tubes, other than straight, as a U-shape the two tubes parallel becomes one connected with one substantially semicircular, parallel three tubes There those N-shaped became one joined by two substantially semicircular, or parallel four tubes is that you use those three substantially connected by semicircular W shape became one it can. In the case of using the light source of these three shapes, the distance between the centers of parallel portions of the tube, the distance W between the centers of adjacent linear light sources.

[0014] The linear light source is a point force of luminance uniformity LED arrayed in linear terms of preferred tool luminous efficiency cold cathode tube, a combination of LED and light guide is preferred. LED are arranged in a linear or when using a combination of LED and the light guide body, a series of LED pairs arrayed, or if the combination of the LED and the light guide body is more, linear light sources a plurality of, and it is.

[0015] Light diffusion plate of the present invention includes a light incident surface which light from the light source is incident, provided on opposition side of the light incident surface, the light emitted by diffusing light incident from the light incident surface obtain Bei an exit surface. The light incident surface is formed as a substantially flat planar surface without irregularities, in the light emission surface, a specific structure is formed. Here, the substantially flat planar surface, the center line average surface roughness (Ra) force 5 mu m or less, preferably 3 mu m or less, more preferably of 1 mu m below the surface.

[0016] Light diffusion plate of the present invention, the light emitting surface includes a prism array having a plurality of linear pre prism made polygonal force sectional concave or convex. Here, the prism array is described with reference to the light diffusing plate 301 shown in FIG. 8 as an example. As shown in FIG. 8, prism array 301B is also configured plurality of linear prisms 301 A force substantially parallel to each other, the cross section perpendicular to the longitudinal direction of the linear prisms 301 A is formed in a sawtooth shape as seen roughly it is those that have been. Note that you Itewa 8, since a very schematic illustration, prism array is expressed in a uniform serrated, but the light diffusion plate of the present invention are those having a specific shape as described below it is. Here, the polygon, for example, other triangular, as shown in FIG. 6-7, pentagon shown in FIG. 10, include heptagon or the like shown in FIG. 11. In the particular embodiment one of the linear prisms having more than one plane (described later light diffuser plate (ii)), the formation easiness, triangles are particularly preferred. Furthermore, these different types of polygons may be mixed in a single light diffusion plate. As used herein, the wording of "polygon" for convenience of explanation, corresponding to each of the recesses or protrusions of the linear prisms, the section plane (Cross-Sectional

Line segment open 7 this route in plain Roh, open path composed of line segments) a: g, to taste. As illustrated above, obtained by connecting both ends of the open path closed path (close The d

Depending on the number of sides or points of path), it referred to them (the default meanings) to correspond to a polygon.

[0017] Here, the concave cross section of the linear prisms, such as the regions U603, shown in a region U2 and 6 shown in FIG. 1, perpendicular to the longitudinal direction of the linear prisms constituting the prism array a cross section (hereinafter, simply "cross section" of. the ridges) in refers to a region between the crests T in FIG adjacent. Further, the convex cross section of the linear prisms, such regions U601 and U602 as shown in a region U1 and 6 shown in Figure 1, in the cross section of the ridges, in the figure adjacent valleys V of It refers to the area between. In the present invention, if satisfying one at least in one defined in the following conditions for the linear prisms viewed as a case viewed as a concave or convex, and the condition is satisfied. For example, the example shown in FIG. 6 satisfies the condition that defines the linear prisms below when viewed as a convex.

[0018] Light diffusion plate of the present invention, the following (i 1) or (ii 1), satisfies at least one requirement:

Requirements (i 1):

Together with a respective linear prisms force four or more sides,

Its cross-sectional shape in which polygons force the axisymmetrical shape normals as an axis of the incident surface requirements (ii 2): wherein polygon is an axisymmetric shape normal line of the light entrance surface as an axis the prism array, as well as shapes including different types of the linear prism is perpendicular to the longitudinal direction of the linear prisms and the light incident surface in a direction parallel Nio, Te

, Within the width of the linear light source, including all types of the plurality of types of linear prisms.

Hereinafter, the requirements a light diffuser plate satisfies the (i-1), as referred to as "light diffusing plate (i)", requirements fully plus a light diffusing plate (II- 1) "the light diffuser plate (ii)".

[0019] (light diffuser plate (i))

In the light diffuser plate (i), each linear prism, which has four or more faces, polygons that is a cross-sectional shape is a shape linearly symmetrical with the normal of the light incident surface as an axis. More specifically, each of the linear prisms, a first planes that having a plurality of surfaces which are inclined to one side, the opposite side of the surfaces constituting the first planes and a second planes that have a plurality of surfaces inclined, in the cross section of the ridges, the polygonal line shape drawn by a polygonal line shape and the second planes drawn by the first planes, axisymmetrical shape as an axis the normal of the light incident surface.

[0020] a first surface groups to the normal to the light incident surface are inclined in opposite directions and the second planes, specifically, for example, it surfaces 6a and 7a in the example shown in FIG. 1 sequence by the surface groups of planes and the surface 6b and 7b made of, is a surface group consisting of surfaces 8a and 9a and the surface 8b and 9b force becomes planes in the example shown in FIG.

[0021] Light diffuser (i), the number of faces composing the linear prism is preferably 4 to 10. Further, among these surfaces, the number of faces which are inclined in opposite directions with respect to the normal of the flat surface, each preferred is 2 to 5,. More to the number of faces composing the linear prism 4 to 10, can have high light diffusion plate having uniformity of luminance. Further, the and the child 2 to 5, the desired prism array at the time of molding of the mold during manufacture and resin can be obtained accurately.

[0022] Such a linear prisms, specifically described with reference to FIGS. In shown to example example in Figure 1, in the light exit surface 4 of the light diffusion plate 1, and the first planes or surfaces 6a and 7a of the linear prisms Ranaru, a second surface groups of 6b and 7b but it is inclined so as to be opposite to each other with respect to the normal N1.

[0023] surfaces and the angle between the light incident surface of the linear prisms, surface e.g. Una by 1 and 2, illustrating aspects angle as the surface close to the light incident surface is large, or in FIG. 3, for example 10-12, such as, the light incident surface forces also may take the far surface as the angle is larger aspects like.

[0024] the linear prism, the center line of the linear prisms (i.e., a normal of the light incident surface, if the linear prism is convex ridge portions of the linear prisms, linear prisms concave around the line) passing through the valley of the linear prisms in the case of the left and right (i.e., in the cross section of the prism array, the one side and the other side) of the center line, to have the same number of surface preferable for enhancing the luminance uniformity Hitoshido.

[0025] Further, each surface constituting said linear prisms per cent to the left and right linear prisms Te, the angle of the direction inclined at opposite slope a pair of equal surface. In the example specifically illustrated in Figure 1 for example, the angle and the light incident surface light incident surface and a right side surface 6a and the left side surface 6b Togana the angle is, without a is pair of equal angles XI, and it forms a light incident surface and the right surface 7a and sumo an equal angle X2 pair formed by the angle and the light incident surface and the left surface 7b is. In the example shown in FIG. 2, without the sumo an equal angle XI pair forming an angle the light incident side and the right side surface 8a is and the light incident surface and the left side surface 8b is, and the light incident surface and the right sumo like the surface 9a and the angle and the light incident surface and the left surface 9b is formed of, form a is versus angle X2, Ru. With such a configuration, Ki out to produce a linear prism conveniently high precision, and can be efficiently enhanced luminance uniformity ratio.

[0026] The surface of the linear prisms, as in the example shown in FIGS. 1 and 3, the linear prisms and parallel is symmetrical centered on the center line thereof is substantially the same cross-sectional shape has optionally one may be, as in the example shown in FIG. 2, each of the shape of the parallel to the linear prisms may be made different. In the example shown in FIG. 2, contact each of the linear prisms area force parallel surface 8 near the apex of the linear prisms, Te is configured differently, Ru.

[0027] (light diffuser plate (ii))

In the light diffuser plate (ii), the polygons in the linear prism is a line-symmetrical shape normal to (normal as through the vertices of the polygon) as the axis of the light incident surface. Specifically, for example, the case where the cross-sectional shape of the linear prism is triangular, the triangle is an isosceles triangle. Therefore, the angle between the respective light incident surface of the two inclined surfaces of each pair of symmetric 1 or more pairs of inclined surfaces constituting the polygon to configure are equal. In this case, the the two inclined surfaces, when the cross section chose linear prism to be symmetrical polygon, the light incident reflecting surface is that of the two inclined surfaces not parallel. With such a configuration, the light diffusing plate easily designed, it is possible to manufacture, while increasing the brightness uniformity of the direct-type backlight device, a product, and can also view angle and to some extent wider . The present specification Nio Te, the angle between the respective light incident surface of the two slopes is "equal," and is the case within a difference of angle. In some cases, it may be the vertex of linear prisms are rounded, in this case, the angle is the angle between the straight portion and the light incident surface of the two inclined surfaces constituting the linear prisms show.

[0028] Te you, the light diffuser plate (ii), the prism array is different shapes, including a plurality of types of the linear prisms. Types of linear prisms is not particularly limited as long as two or more, it is preferably not more than 3 or more five. With three or more, it is possible to obtain a high uniformity ratio of luminance. Meanwhile With five or less, the light diffuser plate in manufacturing the dies, etc., the linear prisms can be arranged accurately in a desired position. Here, the linear prisms are classified into the same kind, average the sum of the angle between it Zoreto light incident surface of the two inclined surfaces constituting each pair, the sum of the angles in the whole line-like prisms is that when the Saryoku one degree within a range of the average angle was.

[0029] Light diffuser Te you, the (ii), the prism array is left in the longitudinal direction and the light incident surface parallel to the direction perpendicular to (ie FIGS of the linear prisms direction; hereinafter simply in that.) "width direction", within the width of the linear light source, including all types of the plurality of types of linear prisms. As "width" of the linear light source, the case of a cylindrical linear light source, it is possible to the diameter and width. Width of the linear light source, rather preferably is 2: can be LOMM. To include all types of the linear prisms of the plurality of types such within the width of the linear light source, Oite the most part in the width direction of the prism array, as long as it is within the range of width refers to it to contain all kinds of the plurality of types of linear prisms. With such a configuration, since the incident light Te at least one odor in the width dimension is injected into a normal direction of the light incident surface, thereby improving the luminance uniformity ratio. [0030] Te you, the light diffuser plate (ii), the linear prisms, you as long as satisfying the above requirements, Te, before Symbol be lined regularly during prism array, by irregularly arranged Although can have, as a specific embodiment, it is repeatedly arranged in the area unit force prisms conditions in a column containing all kinds of set of the plurality of linear prisms, the same as the width dimension of the repeat pitch power linear light source of the area units Does it than can be given a short ヽ aspects. Width repetition pitch of the area units, more particularly 0. 05mn! It can be a ~ 5. Omm. One number of the linear prisms or Oh the region unit is not particularly limited, includes all kinds of pixels respectively one or more of the plurality of linear prisms! /, Is I if! /,.

[0031] The aspects of such a region units are repeatedly arranged, it will be described with reference to the examples shown in FIGS. In the example shown in FIG. 6, prism array disposed on the light emitting surface 604 of the light diffusion plate 601, the area unit U611 comprising linear prisms 612 in the linear prisms 611 and regions U602 in the area U601 a. Area unit U611, in addition to linear prisms, also includes a Tan Taira portion 613. Angle X601 the slope and a light incident surface of the linear prisms 611 is a different angle than the angle X602 the slope and a light incident surface of the linear prisms 612. Realm unit U611 is repeated in the width direction to form a prism array.

[0032] In the example shown in FIG. 6, the linear light source 602a and 602b of the diameter or width dimension D1 is larger instrument whereby than the width of the area unit U611, at any position in the width direction of the prism array, the D1 in the range of dimensions, will contain both linear prisms 611 and 612, configuration including all types of multiple types of linear prisms in the range of the width of the linear light source is achieved.

[0033] On the other hand, in the example shown in FIG. 7, four types of linear prisms U21, U22, U23 and these four linear prisms regularly by the area unit U211 comprising in this order is repeatedly arranged U24 It is provided to. Width of area unit U211 is the same as the width dimension of D1, whereby at any position in the width direction of the prism array, includes all Oite the range of dimensions of D1, linear prisms U21~24 will be, configured to include all types of multiple types of linear prisms in the range of the width of the linear light source is achieved.

[0034] Although not particularly limited thickness of the light diffusion plate of the present invention, further preferably 4mm from the preferred instrument 0. 8 mm it from 0. 4mm is 5 mm. Thickness and is 0. 4 mm smaller than measure for suppressing the deflection due equal to its own weight to form a large number of pillars is required. Further, molding the thickness exceeds 5mm is difficult.

[0035] Te it, the present invention is good that the linear prisms of the light diffusing plate pitch, i.e. the distance between the crest or between valleys of adjacent linear prisms is less than 20 mu m or more 700 mu m it is preferable to have the al or less and more preferably tool 40 mu m or more 400 mu m Mashigu or less 30 m or more 500 mu m. When the pitch is less than the preferred range mentioned above, shape or given with shape summer difficult for fine, light diffusion effect is likely to be lowered. When the pitch exceeds the preferable range above, the light diffusion becomes rough, which may cause uneven luminance.

[0036] In the present invention, can be in more diverse directions for emitting a surface of the prism array of the light diffuser plate was Soi匕 within proper degree range. In that case, good that the center line average surface roughness when the surfaces of the linear prisms was measured 20 mu m in the direction perpendicular to the longitudinal Direction (Ra) is less than 0. 08 mu m or more 3 mu m it is more preferably not more than more favorable Mashigu 0. 1 m or more 1 mu m Mashigu 0.09 or less mu m or more 2 mu m. Ra can be appropriately varied the direction of emission of light by a preferred range said.

[0037] The material of the light diffusion plate of the present invention is not particularly limited, it can be a composition such as glass, a 榭脂 and 榭脂. Compositions comprising 榭脂 or 榭脂, a mixture of immiscible two or more 榭脂, or be used such as those prepared by dispersing a light diffusing agent in a transparent resin as possible. Among these, it is lightweight, light-diffusing transparent 榭脂 since molding including composition 榭脂 or 榭脂 there is preferably instrument total light transmittance and adjustment of the haze is easy because it is easy obtained by dispersing plate is particularly preferred. Further, formed by obtained by dispersing a light diffusing agent in the light diffusion plate across the transparent resin containing the prism array portion, the entire light diffusing plate to be adjusted to the same total light transmittance and haze, the light diffusing since the direction of light emitted from the plate can be varied to further, more preferred.

[0038] particularly limited content of the light diffusing agent of the transparent resin material obtained by dispersing a light diffusing agent may be appropriately selected depending on the linear light source spacing thickness and backlight Nag light diffuser force the content of the light diffusing agent as usually equal to or less than 100% preferably fixture more than 80% by adjusting the content of the light diffusing agent so that the total light transmittance is 100% or more and 60% or less of the dispersion more preferred, to adjust the content of the light diffusing agent so that adjustment is more preferred instrument 90% to 100% inclusive of. Haze is more preferable to adjust the content of the light diffusing agent so as not to exceed 90% preferably instrument 0% or more by adjusting the content of the light diffusing agent so that less than 95% 0%. The total light transmittance of 60% or more, haze of can further improve the luminance by 95% or less, the total light transmittance of 100% or less, more brightness uniformity by the haze to 0% or more it is possible to improve. This value measured in both smooth 2mm thick plate by total light transmittance and ¾JIS K7361-1 cases, a value measured in both smooth 2mm thick plate by haze ί Contact IS K7136.

[0039] and a transparent resin and ί Contact IS K7361- 1 by means of a double-sided flat 2mm thick plates at measuring boss was a total light transmittance that the 榭脂 of 70% or more in the present invention, for example, polyethylene, propylene Ren ethylene interpolymer polymers, polypropylene, polystyrene, an aromatic Bulle monomer and lower alkyl group a copolymer of (meth) acrylic acid alkyl ester, polyethylene terephthalate, terephthalic acid - ethylene glycol - Cyclohexanedicarboxylic methanol co cyclohexane polymerization body, polycarbonate, acrylic 榭脂, as possible out and the like 榭脂 having an alicyclic structure. Among these, polycarbonate, polystyrene, an aromatic Bulle based monomer having an aromatic vinyl monomer and a lower alkyl group containing more than 10% (meth) copolymer or fat of acrylic Sana alkyl ester榭脂 榭脂 like water absorption having a cyclic structure is 25% or less 0.1 is, the deformation due to moisture absorption is small, preferable in that it is possible to obtain a warp less large light diffusion plate.榭脂 having an alicyclic structure has good fluidity, the obtained manufactured efficiently large light diffusion plate, further preferred U ヽ in that it can form as designed the prism array of the specific shape. Con pound were mixed 榭脂 and light diffusing agent having an alicyclic structure, combines high permeability and necessary light diffusion plate and a high diffusivity, chromaticity than good, it can be suitably used. Here, the (meth) acrylic acid, is shown acrylic acid and Metatari Le acids.

榭脂 having [0040] an alicyclic structure is 榭脂 having an alicyclic structure in the main chain and Z or the side chain. In terms of mechanical strength and heat resistance, 榭脂 containing alicyclic structure in its main chain is preferred especially. Examples of the alicyclic structure include saturated cyclic hydrocarbon (cycloalkane) structure, unsaturated cyclic hydrocarbon (cycloalkene, cycloalkyne) and structure. In terms of mechanical strength and heat resistance, cycloalkane structure even cycloalkane structure Ya cycloalkene structure preferably tool in the most preferred. The number of carbon atoms constituting the alicyclic structure

Although no particular limitation, 4 to 30 pieces usually preferably 5 to 20, when more preferably 5 to 15 amino range, molding properties of mechanical strength, heat resistance and light diffuser plate a highly it is balanced, which is preferable. Ratio of repetition units having an alicyclic structure in 榭脂 having an alicyclic structure may be appropriately selected depending on the intended use, but is usually 50 wt% or more, preferably 70 wt% or more, more preferably is 90 wt% or more. When the ratio of the repeating units that have a alicyclic structure is too small, undesirably the heat resistance is lowered. Incidentally, the repeating units of other than the repeating unit having an alicyclic structure in the 榭脂 having an alicyclic structure are appropriately selected depending on the intended use.

[0041] Specific examples of 榭脂 having an alicyclic structure, (1) norbornene monomer ring-opening polymers and norbornene-based monomer and this ring-opening copolymerizable other monomer ring-opening copolymer of, as well as hydrogenated products thereof, addition polymers of norbornene monomers and Roh Ruborunen based monomer and copolymerizable therewith other addition copolymer of a monomer such as norbornene polymer; (2) monocyclic Orefin based polymers and hydrogenated products thereof; (3) cyclic conjugated diene polymers and hydrogenated products thereof; (4) vinyl alicyclic hydrocarbon based monomer polymers and vinyl alicyclic hydrocarbon based monomer and copolymerizable therewith other copolymers of monomers of the body, as well as hydrogenated products thereof, a polymer of a vinyl aromatic monomer hydrogenated products of the aromatic rings and vinyl aromatic monomers and copolymerizable therewith other Vinyl alicyclic hydrocarbon polymers such as hydrogenated products of the aromatic rings of the copolymer and the amount thereof; and the like. Among these, from the viewpoints of heat resistance and mechanical strength, preferably norbornene nen polymer and vinyl alicyclic hydrocarbon polymers, ring-opening polymer hydrogenation product of a norbornene-based monomer, norbornene single mer and this ring-opening copolymerizable opening copolymer hydrogenated product with its other monomers, hydrogenated products of the aromatic rings of the polymers of vinyl aromatic monomers and vinyl aromatic monocyclic mer and copolymerizable therewith other hydrogenated products of the aromatic ring of a copolymer of monomers are more preferred.

[0042] Light diffusing agent used in the light diffusion plate are particles having a property of diffusing light, it is broadly classified into non-aircraft FILLER one organic filler. As the inorganic filler, specifically, silica, Mizusani匕 aluminum, Sani匕 aluminum, titanium oxide, zinc oxide, barium sulfate, be used and magnesium silicate, or mixtures thereof. As a specific material of the organic filler include acrylic 榭脂, acrylonitrile, polyurethane, Porishioi匕Bi - Le, polystyrene 榭脂, polyacrylonitrile, polyamide, polysiloxane 榭脂, melamine emissions based 榭脂, and it is possible to use a base Nzoguanamin system 榭脂 like. Of these, positive polystyrene-based 榭脂, and polysiloxane 榭脂 or fine particles made even these crosslinked product force, highly disperse, high heat resistance, since the coloration during molding (yellowing) is not particularly suitable can and Mochiiruko to. Particles becomes crosslinked product force polysiloxane 榭脂 is than excellent in heat resistance, can be used more suitably.

[0043] The shape of the light diffusing agent used in the light diffusion plate is not particularly limited, for example, spherical, standing side shape, a needle shape, a rod shape, spindle shape, plate shape, flake, fibrous and the like, among them spherical beads that can be isotropic a diffusion direction of the light is preferred.

[0044] The light diffusing agent is used by being contained in a dispersed state within the transparent 榭脂.

[0045] refractive index of the material constituting the light diffusing plate of the present invention is not particularly limited, and may be in the range of 1.2 to 2.0.

[0046] In the production of the light diffusion plate of the present invention, particularly limited in method for forming the prism array of the specified shape on the surface Nag example, to form a prism array on a flat light diffusion plate surface can, or molding the light diffusing plate and may be simultaneously formed prism array. Particularly limited Hanagu example on a method of forming a prism array on a flat light diffusion plate surface, it can Rukoto to cutting using a tool capable of forming a linear prisms having a desired shape, or photocuring榭脂 is applied, it can also be hard I spoon while transferring a mold of a desired shape. A light diffusing plate prepared by extrusion molding, the prism if you form a prism array simultaneously, Ki out to profile extrusion using a profile die having a desired prism array shape, or by embossing after extrusion it is also possible to form the ridges. Prepared by casting light diffuser plate, when forming a prism array simultaneously, it is possible to use a casting mold capable of forming a desired shape of flop rhythm ridges. Produced by molding out morphism a light diffusing plate, when forming a prism array simultaneously, it is possible to use a mold capable of forming a desired shape of prism array. Type shape transfer to the photocurable resin, the extrusion force 卩E by profile die, embossing force 卩E, casting or by injection molding, the mold used in forming the prism array can form the desired linear prisms can be obtained by Den铸 machining cutting to the type of the metal member using the tool, or onto a desired shape is formed member.

[0047] direct-type backlight device of the present invention comprises a plurality of linear light sources arranged in parallel, a reflection plate for reflecting light from the linear light source and a light diffusion plate of the present invention.

[0048] reflecting plate used in the present invention is not particularly limited, white or 榭脂 colored in silver, it is possible to use a metal or the like, the color is white preferred tool material from the luminance uniformity ratio improved lightweight point force of I spoon ゝ Luo 榭脂 is preferable. Reflector can be provided on the way, the linear light source, the light diffusion plate opposite to the position of the anti-radiation plate 303 shown in reflector 603 and 8 shown in FIG.

As a particularly preferred embodiment of the direct-type backlight device of the [0049] present invention, those satisfying the following requirements (i 2), or the like satisfy the following requirements (ii 2):

[0050] a (i 2) the light diffusing plate, wherein the light diffusing plate mentioned above (i), is configured to include a transparent 榭脂, each linear prism, based on the normal line of the light incident surface a first planes having a plane number multiple inclined to one side and a second surface group having a plurality of surfaces which are inclined to the opposite side of the surfaces constituting the first planes comprising, in each of the plane group, the number of the surface and the S, the first surface in order respectively from those angle between the surface and the light incident surface is small, a second surface, and ... 'the S surface the angle between any j-th light incidence surface and the light incident surface Xj (°), the j-th surface force closest, close to the linear light sources and the second at position linear in the position the distance between the light source W (mm), the distance between the center and the light incident surface of the linear light source a (mm), the distance between the center and the light incident surface of the j-th surface bj (mm), longitudinal direction line of the linear prisms The angle between Jo source Y (°), and the refractive index of the transparent resin eta, at least one group of first planes and the second planes, in the case of j≥2 Equation (1 relationship holds a), in the case of j = 1 is established formulas (2).

[0051] (ii 2) a light diffuser plate, wherein the light diffusing plate mentioned above (ii), is configured to include a transparent 榭脂, S species type of slope contained in all of the linear prisms and then, the slope and turn each of the first inclined surface from what angle is small and the light incident surface, the second inclined surface, and ... 'the swash surface, any j-th j slope of the light incident surface the angle Nasu and Xj (°), the from the j slope, distance W (mm between the linear light source and the front Symbol linear light source is located closer to the second which is located closer to the first ), and the distance between the center and the light incident surface of the linear light source and a (mm), the distance between the center and the light incident surface of the first j slope and bj (mm), pre-Symbol linear prisms longitudinal and the angle between the longitudinal direction of the linear light source and Y (°), the refractive index of the transparent resin as eta, holds the relationship of equation (1) in the case of j≥2, j = l Equation (2) holds in the case.

[0052] [number 5]

Wx (2 X j-3) / (4xS) ≤

(axtan (sin- 1 (nxsin ( Xj - sin- 1 (sin (Xj) / n)))) + b.jxtan (Xj-sin "1 (sin (X j) / n))) xcos (Y) ≤WX (2X j + l) / (4xS)

(1)

[0053] [number 6] 0≤

(axtan (sin "1 (nxsin (Xj-sin" 1 (sin (Xj) / n)))) + bjxtan (X j - sin- 1 (sin (Xj) / n))) xcos (Y) ≤WX (2X j + l) / (4xS)

(2)

[0054] In the following, the requirements (i 2) "direct type backlights device (i)" a direct-type backlight device of the present invention satisfying the direct type back of the present invention which satisfy the, requirements (II- 2) a write device, a "direct type backlight device (ii)"!, cormorants.

[0055] type backlight device (i) and type backlight device (ii), the luminance uniformity ratio high, preferable for a direct-type backlight device. More preferably, contact, Te is the direct type backlight equipment (i) and type backlight device (ii), the following equation (3) that one elevation made Te you, the J≥ 1, further luminance uniformity preferable in increasing the degree.

[0056] [Equation 7]

Wx (jl) / (2xS) ≤

(axtan (sin -1 (nxsin ( Xj-sin -1 (sin (X j) / n)))) + b jxtan (X js in "1 (sin (Xj) / n))) cos (Y) ≤ (Wxj) / (2xS)

(3) In each of the above parameters, Xj can take a value of 0 to 90 °. The value of W is preferably Do limited especially, it is. 15 to 150 mm,. 20 to: more preferably LOOmm. The value of a is that it is preferable Ri yo is preferred instrument 5~25mm a Yogu 5~30mm be designed with particular consideration of the thickness and the uniformity ratio of luminance of limited without direct type backlight device. The value of b is preferably 0. 4 to 5 mm.

[0058] wherein each parameter Xj, W, a and b is specifically intended to be as measured as shown in FIGS. 1 and 6. In the example shown in FIG. 1, Xj is the angle XI and X2, P is the distance between the respective linear light sources 2a and 2b the center, a is the distance from the linear light sources 2a or 2b to the light incident surface 5 There also bj is the distance indicated by arrow bl and b2. In shown to example in Figure 6, Xj is the angle X601 and X 602, W is the distance between the centers of the linear light source 602a and 602b their respective, a is the linear light source 602a the light incident surface 605 or 602b a distance to, and b is the distance indicated by arrows b601 and b 602. Here, in the "the center of the j-th surface," as shown at the upper end of the arrow b601 and b6 02 in the upper end and 6 arrows bl and b2 in FIG. 1, the ridges cross refers to an intermediate point between the other end from one end of each surface.

[0059] Further, the above parameters Y, the "angle between the longitudinal direction and the linear light source of the linear prisms", longitudinal and linear linear prisms when viewed from a direction perpendicular to the light incident surface It refers to the longitudinal direction angle between the light sources. For example, the relationship shown in the longitudinal direction and the linear light source and power 8 of the linear prisms, i.e. when it is in parallel relationship is a Y = 0, the light diffusing plate 3 01 in the surface direction of the light diffusing plate by rotating, it is possible to change the value of Upsilon. The range of values ​​of Υ is may be particularly limited not 0 to 90 °, the upper limit is preferably 60 ° or less, more preferably 50 ° or less, der less even more preferably 45 ° that. The angle between the linear light source and the prism array by a 60 ° or less, it is possible to reduce brightness unevenness.

[0060] The above parameters scratch, in the direct type backlight device, for luminance uniformity ratio improved, but it is preferably constant across, not be constant, each region satisfies the above conditions, the condition You can obtain a ヽ effect favored based on.

[0061] Here, the equation (1) the significance to (3) will be described with reference to the drawings. These numbers formula (1) to (3) are, in short, when observed a light diffusion plate from the light emitting surface side, the image is reasonable intervals of a plurality of linear light sources to the linear light Minamotoma It confirmed, the direct-type backlight device, which is a condition to be able to have good luminance uniformity with high luminance.

Figure 4 is a schematic sectional view of a description to, direct backlight equipment Significance of the equation (1) to (3). 5, when the direct type backlight device is a direct-type backlight equipment (i), an enlarged view of portion 50 in FIG. 4, a cross-sectional view of one of the linear prisms are shown. While Figure 9 is when the direct type backlight device is a direct-type backlight device (ii), an enlarged view of portion 50 in FIG. 4, a cross-sectional view of one area unit is shown. As shown in FIGS. 4, 5 and 9, in the direct type backlight device, in the above equation shows a case where S = 3, Y = 0 ° and light diffuser is provided. In such a direct-type backlight device, consider the hypothetical state as follows. That is, the upper direction downward force from connexion in Figure 4, in other words, the light entrance, which is a flat surface (virtually a light incident surface. In this case) light-emitting surface of the linear prisms are formed face (the virtually light exit surface here. hereinafter referred to as "lower surface".) countercurrent force connexion, is light perpendicular to the lower surface if the incident Nitsu!, consider Te.

[0062] For example, taking a single incident light I as an example, the light incident on the j surface of the linear prisms is refracted in the first j surface and the lower surface of the linear flop rhythm, the center position of the j surface force also reaches the position of the horizontal distance component in accordance with the central terms in Oite a plane distance apart of (a + b), equation (1). Numerical central section, since W, a, b, n is a constant, is a function of Xj only. Thus, in one planes of linear flop rhythm, if there is the S plane, so that the position where the light reaches also the S. Thus, in the example shown in FIG. 4, there will be three reached position II, 12, 13.

[0063] Here, considering the case of these arrival position II, 12, 13 is such as to overlap one, there, the three normally incident light at different positions as shown by the thick arrows in FIG. 4 It will be. Where, when arranging the linear light source in such a superimposed position, the light emitted from the linear light source, following the virtual light path indicated in the previous predicate the thick line in the opposite, second of the linear prisms emitted from j surface and in a direction perpendicular to the upper. Therefore, when observing the light diffusion plate from the top in the vertical direction, so that the image of the linear light sources on the emission position in the vertical direction of the light is observed. That is, in the example shown in FIG. 4 及 beauty Figure 5, since one of the planes of the linear prisms have three faces, also in the example shown in FIG. 4 and FIG. 9, one area unit 3 since it has a surface, so that the image of the three linear light sources are observed in each of the examples. [0064] Therefore, the image of the linear light sources, by designing the Xj to be present at an appropriate distance between the distance of half between the adjacent linear light sources, can greatly improve the luminance uniformity ratio . That is, half the distance between adjacent linear light sources (WZ2) in yo immediately when this be designed so that there is the S image, it is preferable that the lined image of the linear light source at equal intervals WZ2S. However, since in this way placing the image of the linear light source at equal intervals are viewpoint et difficulty productivity of the light diffusion plate, the present inventors is a position where the image of the linear light source becomes equal intervals even without, I began to see that it has a sufficient effect if located within a range with a position force some degree of width of the arc. In other words, the range of positions to be equally spaced, when shown as a function of j ((¾ over 1) XW) / gave the width of WZ2S on both sides from the force this position can be expressed as (2X (2 XS)) can you to the. Therefore, the position, (2 preparative 1) XW) / (2X (2XS)) - from W / 2S), (2j- 1) XW) / (2X (2 XS)) + W / 2S) become possible so that is preferable. Organize the formula Then, the value of the lower limit WX (¾- 3) / (4XS), and the upper limit value becomes WX (¾ + l) / (4XS). The lower limit value of the upper limit corresponds to the left and right sides of each of the equation (2). Even more preferably, the width of a case where the WZ4S, this case corresponds to the number of formula (3). In the above formula (1), in the case of j = l, since the force distance the value of the left side is a negative value does not take a negative value, the lower limit of the value when j = l is 0 is shown in equation (2).

[0065] Note that, in the middle part of equation (1) ~ (3), 1 ^ & ^ _ | 'portion up over mosquito et 3 (/ 11))), the light perpendicular to the prism side force light diffuser plate when but considering the original opposite state of incident light is a distance in the horizontal direction to reach the up prism surface forces inherent light incident surface, (sin (Xj / n) from sin- 1) aX tan) portion up) is the horizontal distance that light reaches up to the same plane as the center of the original light incident surface power source when considering similar conditions.

[0066] By forming the light diffusing plate that satisfies such formulas, to become like images of a plurality of linear light sources are observed between the linear light source, the luminance uniformity ratio as compared with the conventional it is possible to increase. At this time, the present inventors, in addition to the case where the light diffusing plate does not contain a light diffusing agent, a light diffusing agent is contained in the light diffusion plate, if considered light does not go straight in the light diffuser plate However, we found that it is possible to achieve the same effect.

[0067] If necessary, more increasing the area of ​​the surfaces involved in the formation of the image of the linear light source, thereby improving the brightness at the portion where the image is observed.

[0068] direct-type backlight device of the present invention, the linear light source, reflector and Yogu The structure of these essential be modified within the scope of the force evenly including the light diffusing plate as the essential components in addition to the elements can comprise any of the components. For example, for the luminance and the uniformity ratio of luminance increase, the light source power of the light diffusion plate be farther may comprise a diffusion sheet and a prism sheet. Further improve luminance, the following (A) and Z or (B) a far source power of the two kinds of sheets, Yo be provided on the side ヽ:

An optical laminate having a cholesteric liquid crystal layer in which the helical pitch of the liquid crystal molecules varies continuously on (A) a transparent substrate, wherein Rth = {(nx + ny) Z2- nz} X d (wherein, nx, ny represents 2 the refractive index in the direction orthogonal to the perpendicular to one another in the direction a thickness direction is nx> ny. nz represents a refractive index in the thickness direction, Rth is the d is defined by a thickness of the sample) a phase difference element 20nm~ an LOOOnm, laminate including a 1Z4 wave plate.

(B) Japanese Patent 3,448,626: reflective polarizer utilizing the birefringence is proposed (corresponding publication EP 0573905A Pat).

[0069] Examples of yet another example of a reflective polarizer, the reflective polarizer utilizing the difference in the reflectivity of the polarized light component by the Brewster angle (e.g., Kohyo 6-508449 JP (corresponding publication: International Publication pamphlet No. W092 / twenty-two thousand eight hundred and thirty-eight) those described in); reflective polarizer utilizing selected reflection characteristics of the cholesteric liquid crystal; Specifically, a laminate of a fill arm and 1Z4 wave plate made of cholesteric liquid crystal (e.g. , JP-a-3 45906: to those described (corresponding U.S. fifth, 235, 443 patent specification)); and applying a fine metal wire pattern reflective polarizer (e.g., JP-2- 308106 No. those described in Japanese); stacking at least two high partial child films, reflective polarizer that utilizes anisotropy of the reflectance due to refractive index anisotropy (e.g., Kohyo 9- 506837 No. Publication: those described in (corresponding to International Publication pamphlet W095Z173 No. 03) ; It has a sea-island structure formed of at least two polymers in a polymer film, a reflective polarizer that utilizes anisotropy of the reflectance due to refractive index anisotropy (e.g., U.S. Patent No. 5, 825 , those described in 543 Pat); to dispersed particles min in a polymer film, a reflective polarizer that utilizes anisotropy of the reflectance due to refractive index anisotropy (e.g., JP-T flat 11-509014 JP: those described in (corresponding Japanese International Patent Publication pamphlet W097Z41484)); polymeric film inorganic particles are dispersed in a reflective polarizer that utilizes anisotropy of the reflectivity based on scattering power difference due to size (e.g., JP-a-9-297204 discloses (corresponding Gazette: 5, 995, 183 No.) those described in US patent); and the like.

[0070] application of the direct-type backlight device of the present invention is not particularly limited, can be preferably used as a backlight in a display device such as a liquid crystal Display I. Example

[0071] Hereinafter, the present invention will be described with reference to Examples and Comparative Examples in more detail, the present invention is not limited to these.

[0072] (Example 1)

榭脂 having an alicyclic structure as a clear 榭脂 (Nippon Zeon Co., Zeonoa 1060 R, the refractive index 1.53) and 99.85 parts by weight, particles of the polysiloxane-based polymer of the crosslinked polymer as a light diffusing agent (GE Toshiba silicone Co., Tospearl 120) from the pellet of 0.15 parts by weight is mixed composition, using a mold having a predetermined prism shape, a prism shape is transferred to the surface by injection molding contour 310 mm X 280 mm, to prepare a light diffusion plate 1 having a thickness of about 2. Omm. This on one surface of the light diffusion plate 1 is parallel to the long sides, and prism array of shows to shape in Table 1 is formed, the other was flat. The light diffusion plate has a total light transmittance was 93%, ^ ^ Ichizu is Atsuta 93%.

[0073] Next, the inside dimension width 300 mm, and depth 200 mm, depth 18mm reflection sheet on the bottom and side surfaces of the housing having an opening (Co. Jjiden Ltd., product name RF188) reflector paste the diameter 4 mm, the cold cathode tubes eight length 360 mm, away 2mm from the bottom, as 25mm the distance between the centers, parallel to the opening the longitudinal direction of the parallel arranged uniformly in the depth direction, by connecting the inverter to the Re this on the lighting device manufactured, the light diffusion plate 1, the prism array is disposed so as to be located on the light emitting surface side parallel to the cold cathode tube. On this, a light diffusing sheet (Co. Kimoto Co., product name 188GM- 2), the reflective polarizing element that uses birefringence (Sumitomo Suriemu Co., product name DBEF-D), and place the polarizer in this order, the direct-type backlight device was produced. Shows the direct-type backlight device, a in prism array each surface, bj, n, j, W, the values ​​of S and Xj in Table 3.

[0074] Then, to light the cold cathode tube to be a tube current 6. 5 mA, the two-dimensional color distribution meter (co - Power Minolta, model name CA 1500 W) and Te use V ヽ in the lateral direction center line equal intervals to measure the luminance of 100 points, calculation of average luminance La and the uniformity ratio of luminance Lu according to equation (5) and the following equation (4), the average luminance in 3536CdZm 2, the luminance uniformity ratio 0.9 Met.

[0075] The average brightness La = (Ll + L2) Z2 Equation (4)

Brightness uniformity Lu = ((Ll- L2) ZLa) X 100 Equation (5)

(L1: in the vertical fluctuation of the luminance, the average luminance maximum value)

(L2: in the vertical fluctuation of the luminance, the average luminance minimum value)

Uniformity ratio of luminance is an indicator of the uniformity of brightness, as this number is less, uniform one of the brightness is high.

[0076] (Example 2)

As the mold, except that had use those having a different predetermined prism shape as that used in Example 1 was operated in the same manner as in Example 1 to prepare a light diffusion plate 2. On one surface of this light diffusing plate 2 is formed with prism array having a shape shown in Table 1 in parallel with the long sides and the other flat surface (? Atsu 7 this.

[0077] Instead of the light diffusion plate 1 except for using the light diffuser plate 2, as in Example 1, to produce a direct-type backlight device was evaluated. The average luminance 3540cd / m 2, the luminance uniformity ratio was 0.7. Also shows the direct-type backlight device, a in prism array surfaces, bj, n, j, W, the values ​​of S and Xj in Table 3.

[0078] (Example 3)

As the mold, except that had use those having a different predetermined prism shape as that used in Example 1 was operated in the same manner as in Example 1 to prepare a light diffusion plate 3. On one surface of this light diffusing plate 3 is formed with prism array having a shape shown in Table 1 in parallel with the long sides and the other flat surface (? Atsu 7 this.

[0079] except for using the light diffusing plate 3 in place of the light diffusion plate 1 in the same manner as in Example 1, to produce a direct-type backlight device was evaluated. The average luminance 3572cdZm 2, the luminance uniformity ratio was 0.7. Also shows the direct-type backlight device, a in prism array surfaces, bj, n, j, W, the values ​​of S and Xj in Table 3.

[0080] (Example 4) by the same procedure as different from that had use those having a predetermined prism shape Example 1 as that used as the mold in Example 1, to prepare a light diffusion plate 4 . On one surface of the light diffuser plate 4 is formed with prism array having a shape shown in Table 1 in parallel with the long sides and the other flat surface (? Atsu 7 this.

[0081] except for using the light diffuser plate 4 in place of the light diffusion plate 1 in the same manner as in Example 1, to produce a direct-type backlight device was evaluated. The average luminance 3497cdZm 2, the luminance uniformity ratio was 0.6. Also shows the direct-type backlight device, a in prism array surfaces, bj, n, j, W, the values ​​of S and Xj in Table 3.

[0082] (Example 5)

Other than the one used in Example 1 as a mold had use those having a different predetermined prism shape by the same procedure as in Example 1 to prepare a light diffusion plate 5. On one surface of the light diffuser plate 5, the direction forming an angle of the long side and 30 degrees, and prism array having a shape shown in Table 2 are formed, the other was flat.

[0083] Instead of the light diffusion plate 1 using the light diffuser plate 5, as the other ridge line of the prism array and a cold-cathode tube was positioned at an angle of 30 degrees as in Example 1, immediately below to create a type backlight device was evaluated. The average luminance 3588cdZm 2, the luminance uniformity ratio was 0.6. Also, shown in the direct-type backlight device, a in prism array surfaces, bj, n, j, W, the values ​​of S and Xj in Table 3.

[0084] (Comparative Example 1)

As the mold, except that had use those having a different predetermined prism shape as that used in Example 1 was operated in the same manner as in Example 1 to prepare a light diffusion plate 6. This on one surface of the light diffuser plate 6 is formed with prism array shape shown in Table 2 parallel to the long sides, and the other flat surface (? Atsu 7 this.

[0085] except for using the light diffusion plate 6 in place of the light diffusion plate 1 in the same manner as in Example 1, to produce a direct-type backlight device was evaluated. The average luminance 3484CdZm 2, the luminance uniformity ratio 2. was 2.

[0086] (Comparative Example 2)

As the mold, except that had use those having a different predetermined prism shape as that used in Example 1 was operated in the same manner as in Example 1 to prepare a light diffusion plate 7. This on one surface of the light diffusion plate 7 is formed with prism array shape shown in Table 2 parallel to the long sides, and the other flat surface (? Atsu 7 this.

[0087] except for using the light diffuser plate 7 instead of the light diffusing plate 1 as in Example 1, to produce a direct-type backlight device was evaluated. The average luminance 3379cdZm 2, the dark in luminance uniformity ratio 3.1.

[0088] The measurement results of the examples and comparative examples, are summarized in Table 3.

[0089] [Table 1]

table 1

2] Table 2

In [0091] Table 1 and Table 2, the "first surface closest to the light source," one light diffusing plate, the first surface from the side closer to the side or light incidence surface close to the light source, the second surface, the third surface, placing the surfaces in the order as that fourth surface.

[0092] [Table 3] Table 3

Table 4

In [0094] Table 3, "a minimum (Equation 1, 2)", "lower (Formula 3)", column "limit (Formula 3)", "upper limit (Equation 1, 2)," and "medium side" is , respectively, 1 \ ^ (2 Bok 3) -1) / (4 3), or 0, WX (jl) / ( 2 XS), (WX j) / (2 XS), WX (2 X j + l) / It shows the calculated values ​​of (4 XS).

From [0095] the results of Table 3, in the embodiment of the direct type backlight device Nitsu stomach of the present invention having a light diffusion plate of the present invention (Examples 1-5), good formation in luminance and luminance uniformity ratio results were obtained.

[0096] (Example 6)

榭脂 having an alicyclic structure as a clear 榭脂 (Nippon Zeon Co., Zeonoa 1060 R, the refractive index 1.53) and 99.85 parts by weight, particles of the polysiloxane-based polymer of the crosslinked polymer as a light diffusing agent (GE Toshiba silicone Co., Tospearl 120) from the pellet of 0.15 parts by weight is mixed composition, using a mold having a predetermined prism shape, a prism shape is transferred to the surface by injection molding contour 310 mm X 280 mm, to prepare a light diffusion plate 8 having a thickness of about 2. Omm. This on one surface of the light diffusing plate 8, parallel to the long sides, and prism array of shows to shape in Table 5 is formed, the other was flat. The light diffusion plate has a total light transmittance was 93%, ^ ^ Ichizu is Atsuta 93%.

[0097] Next, the inside dimension width 300 mm, and depth 200 mm, depth 19mm reflection sheet on the bottom and side surfaces of the housing having an opening (Co. Jjiden Ltd., product name RF188) reflector paste the diameter 3 mm, cold cathode tubes eight length 360 mm, away 2. 5 mm from the bottom, the center-to-center distance as 25 mm, parallel to the opening the longitudinal direction of the parallel arranged uniformly in the depth direction, which in connecting the inverter on the lighting device manufactured Te, the light diffusing plate 8, the prism array is disposed so as to be located on the light emitting surface side parallel to the cold cathode tube. On this, a light diffusing sheet (Co. Kimoto Co., product name 188GM- 2), the reflective polarizing element that uses birefringence (Sumitomo Suriemu Co., product name DBEF-D), and place the polarizer in this order, the direct-type backlight device was produced. Shows the direct-type backlight device, a in prism array each surface, b, n, j, W, the values ​​of S and Xj in Table 8.

[0098] Next, in, to light the cold cathode tube to be a tube current 6 mA, the two-dimensional color distribution meter (co - Kami Norutane earth made, model name CA1500W) at regular intervals Te use ヽ in the lateral direction center line the brightness of 100 points were measured, calculation of the average luminance La and the uniformity ratio of luminance Lu according to equation (5) and equation (4) described in example 1, the average luminance 3233CdZm 2, the luminance uniformity ratio 1. It has been filed by three.

[0099] (Example 7)

As the mold, the same procedure as different from that had use those having a predetermined prism shape Example 6 as used in Example 6, to prepare a light diffusion plate 9. On one surface of the light diffuser plate 9 is formed with prism array having a shape shown in Table 5 in parallel with the long sides and the other flat surface (? Atsu 7 this.

[0100] Instead of the light diffusion plate 8 except for using the light diffuser plate 9, in the same manner as in Example 6, to produce a direct-type backlight device was evaluated. The average luminance 3355cd / m 2, the luminance uniformity ratio was 0.9. Also shows the direct-type backlight device, a in prism array surfaces, b, n, j, W, the values ​​of S and Xj in Table 8. [0101] (Example 8)

As the mold, the same procedure as in Example 6 except that had use is the one provided with different predetermined prism shape as that used in Example 6, to prepare a light diffusion plate 10. On one surface of the light diffusion plate 10, in a direction forming an angle of the long side and 40 °, and prism array having a shape shown in Table 5 were made form, the other was flat.

[0102] Instead of the light diffusion plate 8 except for using the light diffusion plate 10 in the same manner as in Example 6, to produce a direct-type backlight device was evaluated. The average luminance 3268cdZm 2, the luminance uniformity ratio was 1. Zero. Also shows the direct-type backlight device, a in prism array surfaces, b, n, j, W, the values ​​of S and Xj to 8.

[0103] (Example 9)

Other than the one used in Example 6 as a mold had use those having a different predetermined prism shape by the same procedure as in Example 6, to prepare a light diffusion plate 11. This on one surface of the light diffusion plate 11 is prism array having a shape shown in Table 5 in parallel with the long sides is formed, the other was flat.

[0104] except for using the light diffusion plate 11 in place of the light diffusion plate 8 in the same manner as in Example 6, to produce a direct-type backlight device was evaluated. The average luminance 3372cdZm 2, the luminance uniformity ratio was 0.7. Also shows the direct-type backlight device, a in prism array surfaces, b, n, j, W, the values ​​of S and Xj in Table 8.

[0105] (Example 10)

Different from that used in Example 6 as a mold, except for using the one provided in one of the linear prisms of the predetermined prism shape provided with two slopes the same procedure as in Example 6, light diffusion the diffusion plate 12 was fabricated. This on one surface of the light diffusion plate 12 is prism array having a shape shown in Table 5 in parallel with the long sides is formed, the other was flat.

[0106] Instead of the light diffusion plate 8 except for using the light diffusion plate 12 in the same manner as in Example 6, to produce a direct-type backlight device was evaluated. The average luminance 3390cdZm 2, the luminance uniformity ratio was 0.6. Also shows the direct-type backlight device, a in prism array surfaces, b, n, j, W, the values ​​of S and Xj in Table 8.

[0107] (Comparative Example 3) mold, the same procedure as in Example 6 except that had use is the one provided with different predetermined prism shape as that used in Example 6, producing a light diffusing plate 13 did. On one surface of the light diffusion plate 13, parallel to the long sides, and a single type of linear prisms force becomes prism array shown in Table 6 is formed, the other was flat.

[0108] except for using the light diffusion plate 13 in place of the light diffusion plate 8 in the same manner as in Example 6, to produce a direct-type backlight device was evaluated. The average luminance 3279cdZm 2, the luminance uniformity ratio was 2.3.

[0109] (Comparative Example 4)

As the mold, the same procedure as different from that had use those having a predetermined prism shape Example 6 as used in Example 6, to prepare a light diffusion plate 14. This on one surface of the light diffusion plate 14, the long sides parallel to a single type of linear prisms force becomes prism array shown in Table 6 are the form and the other was flat.

[0110] except for using the light diffuser plate 14 in place of the light diffusion plate 8 in the same manner as in Example 6, to produce a direct-type backlight device was evaluated. The average luminance 3180cdZm 2, were luminance uniformity ratio 3.7.

[0111] The measurement results of the examples and comparative examples, are summarized in Table 7.

[0112] [Table 5]

Table 5

In the light diffusion plate 8-1 1, first to fourth slope is equivalent to the slope of the first to fourth prisms, respectively. 6 Table 6

[0114] [Table 7]

Table 7

[0115] [Table 8 Table 8

In [0116] Table 7, "a minimum (Equation 1, 2)", "lower (Formula 3)", column "limit (Formula 3)", "upper limit (Equation 1, 2)," and "medium side" is , respectively, WX (2 X WINCH 3) / (4 XS) or 0, WX (Bok 1) / (2 XS), (WX j) / (2 XS), WX (2 X j + 1) / (4 XS ), and (a X tan (sin _1 ( n X sin (Xj-sin -1 (sin (Xj) / n)))) + bj X tan (Xj- sin- ^ sh Xfi / n);)) X It shows the calculated values ​​of cos (Y).

[0117] From the results shown in Table 7, in the embodiment of the direct type backlight device Nitsu stomach of the present invention having a light diffusion plate of the present invention (Examples 6-10), good formation in luminance and luminance uniformity ratio it can be seen that the results can be obtained. On the other hand, in Comparative Examples 3 and 4, you both average luminance and luminance uniformity ratio, and satisfactory results are obtained Te, Do, can be seen.

Claims

The scope of the claims
[1] and the light incident surface which light enters, the light incident surface and is formed on the opposite side, a light diffusing plate and a light emitting surface that emits the diffuse incident light the light incident surface force there are, the light incident surface is substantially flat planar surface,
The said light emitting surface, provided with a pre-prism ridges having a plurality of cross-sectional concave or convex polygonal linear prisms,
Each linear prism, which has four or more faces, the light diffusing plate polygon is its sectional shape, characterized in that the normal of the light incident surface is a line-symmetrical shape as an axis.
[2] and a plurality of linear light sources arranged in parallel,
A reflector for reflecting light from the linear light source,
A light diffusing plate which is placing serial to claim 1 for emitting diffuse the linear light source and the light incident reflector force,
Type backlight device, characterized in that it comprises a.
[3] A direct-type backlight device according to claim 2,
The light diffuser plate is configured to include a transparent 榭脂,
Each linear prism, based on the normal line of the light incident surface, a first surface group having a plurality of surfaces which are inclined to one side, the opposite side of the surfaces constituting the first planes and a second planes having an inclined multiple faces have,
In each of the second planes and said first planes, the number of the S number, those said surface to the first surface in order respectively from those angle is small and the light incident surface of the surface, the second face, ... - to the third surface, the angle of the Xj (°) between the light incident surface and any j-th surface, the linear light sources and the second in the j-th surface force closest position the distance between the linear light source in close W (mm), the distance between the distance between the center and the light incident surface of the linear light source a (mm), the center and the light incident surface of the j-th surface the bj (mm), the angle between the longitudinal direction and the linear light source of the linear prisms Y (°), the the refractive index of the transparent resin eta, small among the first planes and the second planes in no even 1 group, it holds the relationship of equation (1) in the case of J≥2, direct-type backlight device, wherein the equation (2) holds in the case of j = l.
[Number 1] Wx (2 Xj-3) / (4xS) ≤
(axtan (sin one 1 (nxsin (Xj-sin " 1 (sin (Xj) / n)))) + b.jxtan (X j - sin - 1 (sin (X j) / n))) xcos (Y ) ≤WX (2X j + l) / (4xS)
(1)
[Number 2] 0≤
(axtan (sin "1 (nxsin (Xj-sin" 1 (sin (Xj) / n)))) + bjxtan (Xj-sin "1 (sin (Xj) / n))) xcos (Y) ≤WX ( 2X j + l) / (4xS)
(2)
[4] linear light source power of diffuse light to an optical diffusing plate for emitting,
A light incident surface of the linear light source power ゝ et of light is incident, and the light incident surface and is made form the surface opposite the light emitting surface for emitting diffuse light incident from the light incident surface wherein the light incident surface is substantially flat planar surface,
The said light emitting surface, provided with a pre-prism ridges having a plurality of cross-sectional concave or convex polygonal linear prisms,
The polygon is a line-symmetrical shape to normal line of the light entrance surface as an axis, the prism array, as well as shapes including different types of the linear prisms in the longitudinal direction of the linear prisms vertical, and the light incident surface in a direction parallel Nio, Te
, Within the width of the linear light source, a light diffusing plate to all kinds of said free Mukoto of the plurality of types of linear prisms.
[5] and a plurality of linear light sources arranged in parallel,
A reflector for reflecting light from the linear light source,
A light diffusing plate which is placing serial to claim 4 for emitting diffuse light incident from the linear light source and the reflector,
Type backlight device, characterized in that it comprises a.
[6] A direct-type backlight device according to claim 5,
The light diffuser plate is configured to include a transparent 榭脂,
Wherein each linear prism is configured to include at least two slopes, the kind of slopes are included in all of the linear prisms are s species, from those angle between the inclined surface and the light incident surface is small in turn the first slope, respectively, the second slope, and ... the S slope,
Any j-th j slope an angle between the light incident surface and Xj (°),
From the j-th slope, the distance between the linear light sources in the linear light source is located closer to the first position closer to the second and W (mm),
The distance between the center and the light incident surface of the linear light source and a (mm),
The distance between the center and the light incident surface of the first j slope and bj (mm),
The angle between the longitudinal direction of the longitudinal direction as the linear light source of the linear prisms and Y (°),
The refractive index of the transparent resin as eta,
j≥ holds the relationship of Equation (1) in the case of 2, the direct-type backlight device comprising that you Equation (2) holds in the case of j = 1.
[Number 3]
Wx (2 X j-3) / (4xS) ≤
(axtan (sin "1 (nXsin (Xj- sin one 1 (sin (Xj) / n )))) + bjxtan (X j - sin- 1 (sin (Xj) / n))) cos (Y) ≤WX (2X j + l) / (4xS)
(1) picture 0≤
(axtan (sin- 1 (n sin (X j - sin- 1 (sin (Xj) / n)))) + bjxtan (Xj- sin - 1 (sin (Xj) / n))) xcos (Y) ≤ WX (2X j + l) / (4xS)
(2)
PCT/JP2006/321169 2005-10-28 2006-10-24 Light diffusion plate and direct backlight device WO2007049618A1 (en)

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Cited By (8)

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Publication number Priority date Publication date Assignee Title
JP2009036892A (en) * 2007-07-31 2009-02-19 Tomoegawa Paper Co Ltd Directional film and directive diffusion film
JP2009117194A (en) * 2007-11-07 2009-05-28 Puratekku:Kk Light cover and light apparatus
WO2009078439A1 (en) * 2007-12-18 2009-06-25 Takiron Co., Ltd. Optical sheet and backlight unit using the same
NL1036337C (en) * 2007-12-25 2010-06-22 Sumitomo Chemical Co Surface light source device and liquid crystal display.
JP2010204518A (en) * 2009-03-05 2010-09-16 Toppan Printing Co Ltd Optical sheet arranged with unit lens having a plurality of inflection points
WO2013015250A1 (en) * 2011-07-25 2013-01-31 株式会社小糸製作所 Vehicle lighting device
JP2014103129A (en) * 2014-03-11 2014-06-05 Dainippon Printing Co Ltd Light guide plate, surface light source device and display apparatus
US9217821B2 (en) 2011-10-18 2015-12-22 Dai Nippon Printing Co., Ltd. Light guide plate, surface light source device, and display device

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JP2000231103A (en) * 1999-02-09 2000-08-22 Mitsubishi Rayon Co Ltd Lens sheet and back light and liquid crystal display device using the same

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Publication number Priority date Publication date Assignee Title
JP2000231103A (en) * 1999-02-09 2000-08-22 Mitsubishi Rayon Co Ltd Lens sheet and back light and liquid crystal display device using the same

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009036892A (en) * 2007-07-31 2009-02-19 Tomoegawa Paper Co Ltd Directional film and directive diffusion film
JP2009117194A (en) * 2007-11-07 2009-05-28 Puratekku:Kk Light cover and light apparatus
WO2009078439A1 (en) * 2007-12-18 2009-06-25 Takiron Co., Ltd. Optical sheet and backlight unit using the same
NL1036337C (en) * 2007-12-25 2010-06-22 Sumitomo Chemical Co Surface light source device and liquid crystal display.
JP2010204518A (en) * 2009-03-05 2010-09-16 Toppan Printing Co Ltd Optical sheet arranged with unit lens having a plurality of inflection points
WO2013015250A1 (en) * 2011-07-25 2013-01-31 株式会社小糸製作所 Vehicle lighting device
JP2013026146A (en) * 2011-07-25 2013-02-04 Koito Mfg Co Ltd Lamp for vehicle
US9217821B2 (en) 2011-10-18 2015-12-22 Dai Nippon Printing Co., Ltd. Light guide plate, surface light source device, and display device
JP2014103129A (en) * 2014-03-11 2014-06-05 Dainippon Printing Co Ltd Light guide plate, surface light source device and display apparatus

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