WO2004053539A1 - 光偏向素子及び光源装置 - Google Patents
光偏向素子及び光源装置 Download PDFInfo
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- WO2004053539A1 WO2004053539A1 PCT/JP2003/015282 JP0315282W WO2004053539A1 WO 2004053539 A1 WO2004053539 A1 WO 2004053539A1 JP 0315282 W JP0315282 W JP 0315282W WO 2004053539 A1 WO2004053539 A1 WO 2004053539A1
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- light
- prism
- point
- deflecting element
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices 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
- G02F1/01—Devices 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
- G02F1/13—Devices 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing 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
- G02B5/0215—Diffusing 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 a regular structure
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0257—Diffusing elements; Afocal elements characterised by the diffusing properties creating an anisotropic diffusion characteristic, i.e. distributing output differently in two perpendicular axes
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
- G02B5/045—Prism arrays
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
Definitions
- the present invention relates to an edge light type light source device constituting a liquid crystal display device or the like used as a display unit in a notebook computer, a liquid crystal television, a mobile phone, a mobile information terminal, and the like, and a light deflection element used therein.
- the present invention relates to an improvement in a light deflecting element disposed on a light exit surface side of a light guide of a light source device.
- color liquid crystal display devices have been widely used in various fields as monitors for portable notebook personal computers and personal computers, or as display units for liquid crystal televisions, video-integrated liquid crystal televisions, mobile phones, portable information terminals, and the like. ing.
- liquid crystal display devices have been actively pursued with larger screens and higher definition.
- a liquid crystal display device basically includes a backlight unit and a liquid crystal display element unit.
- the edge light method is frequently used from the viewpoint of making the equipment compact.
- a display device having a relatively small screen size and a relatively narrow viewing direction range for example, a liquid crystal display device used as a display unit of a mobile phone
- an edge-lighting method is used from the viewpoint of reducing power consumption.
- a light source that minimizes the spread angle of the luminous flux emitted from the screen and emits light concentrated in a required angle range is used as the pack light unit.
- a display device in which the range of the observation method is limited in this way as a light source device that emits light in a relatively narrow range in order to increase the use efficiency of the light amount of the primary light source and reduce power consumption
- Japanese Patent Application Laid-Open No. 2000-2014 light emission from a light guide is disclosed. It has been proposed to use a prism sheet having a prism-forming surface on both sides adjacent to the surface. In this double-sided prism sheet, a plurality of prism rows parallel to each other are formed on each of a light incident surface, which is one surface, and a light exit surface, which is the other surface. The directions are matched, and the prism rows are arranged at the corresponding positions 5.
- the light having a peak of the emitted light in a direction inclined with respect to the light emitting surface from the light emitting surface of the light guide and emitting in an appropriate angle range is emitted to the light incident surface of the prism sheet.
- the light is incident from one of the prism surfaces, internally reflected by the other prism surface, and further subjected to refraction by the prism on the light exit surface, so that light can be concentrated and emitted in a relatively narrow required direction.
- a prism sheet used as a light deflecting element has a plurality of prism arrays parallel to each other on both surfaces, and the light entrance surface and the light exit surface. It is necessary to make the prism row direction coincide with the surface and to arrange the prism rows at corresponding positions, which complicates this molding.
- Japanese Patent Application Laid-Open No. H10-254371 discloses that one surface of a prism array is inclined.
- the angle ⁇ is 4.7 to 5.7 degrees, and the inclination angle 3 of the other surface is 34.2 to 35 degrees to improve the luminance in the normal direction, but the other surface is flat. Therefore, sufficient effects have not been obtained.
- Japanese Patent Publication No. 9-507584 International Publication No. WO 94/20871
- Japanese Patent Application Laid-Open No. 09-80405 discloses that one surface of a prism array is convex or concave.
- a prism sheet having a 2D curved surface is disclosed.
- Japanese Patent Application Laid-Open No. 2002-199708 discloses a prism sheet in which one surface constituting a prism array is constituted by a plurality of flat surfaces or one convex curved surface.
- these publications aim to improve the performance of a light source device using a prism sheet by setting the inclination angle of one surface and the inclination angle of the other surface constituting a prism array in a special relationship.
- An object of the present invention is to control the distribution of the emitted light to be very narrow, and to improve the utilization efficiency of the light amount of the primary light source (that is, to concentrate the light emitted from the primary light source in a required observation direction). Emission efficiency is higher) and the image is simplified
- An object of the present invention is to provide a light deflecting element and a light source device that can easily improve the quality.
- the light incident surface has a plurality of prism rows composed of two prism surfaces in parallel with each other. At least one of the two prism surfaces is formed of a non-single plane, and the apex angle ct of one of the prism surfaces constituting the prism array is 2 to 25 degrees and the apex of the other prism surface is An optical deflecting element, wherein the distribution angle 3 is 33 to 40 degrees, and a difference (
- a non-single plane refers to a plane other than a plane consisting of a single plane.
- the apex distribution angle ⁇ is 11 to 25 degrees.
- one of the two prism surfaces is formed of a non-single plane and the other is formed of a single plane.
- the non-single plane includes at least one convex curved surface.
- the non-single plane includes two or more planes having different inclination angles from each other, or includes two or more convex curved surfaces having different inclination angles from each other, or one or more planes. And one or more convex surfaces. In one embodiment of the present invention, the non-single plane has a larger inclination angle as the plane or the convex curved surface located closer to the light emitting surface.
- a difference between an inclination angle of a surface closest to the top of the prism array and an inclination angle of a surface closest to the light emitting surface is 1 to 15 degrees.
- the direction of the peak is substantially the normal direction of the plane on which the prism rows are formed.
- the convex curved surface constituting the non-single plane has a ratio (r / P) of the radius of curvature (r) and the pitch (P) of the prism rows of 2 to 50. is there.
- the non-single plane includes a top and a bottom of the prism array.
- the ratio (dZP) of the maximum distance (d) to the virtual plane connecting to the pitch (P) of the prism rows is 0.4 to 5%.
- a point 1 ( ⁇ 0.111, 1.27) , Point 2 (0.0, 0.0), Point 3 (0.159, 0.195), Point 4 (0.212, 0.260), Point 5 (0.265,0.328), Point 6 (0.319, 0.398), Point 7 (0.372, 0.470), Point 8 (0.425, 0544), Point 9 (0478, 0621), Point10 (0.531, 0.699), Point1 1 (0.584, 0.780), Point1 2 (0.637, 0.861), Point1 It consists of 16 points of 3 (0.690, 0.945), point 14 (0.743, 1.030), point 15 (0.796, 1.117), point 16 (0.889, 1.27), or its neighboring points.
- a point 1 ( ⁇ 0.206, 1.168)
- Point 2 (0.000, 0.000), point 3 (0 159, 0204), point 4 (0.212, 0.273), point 5 (0.265, 0.343), point 6 (0.319, 0.416), point 7 (0.372, 0.490), point 8 (0.425, 0.567), point 9 (0.78, 0.646), point 10 (0.531, 0.727), point 1 1 (0.584, 0.810), point 1 2 (0.637, 0.897), point 1 3 (0.794, 1.168) It consists of 13 points or their neighboring points.
- a point 1 ( ⁇ 0.284, 1.059) , Point 2 (0.000, 0.000), Point 3 (0.212, 0278), Point 4 (0.265, 0.350), Point 5 (0.319, 0.423), Point 6 (0.372, 0.501), Point ⁇ (0.425, 0.581) , point 8 (0.478, 0.663), point 9 (0.531, 0.748), point 1 0 (0.584,0.834), point 1 1 (0.637, 0.922), point 1 2 (0.71 6, 1.059) in 1 2-point or It consists of shapes that connect neighboring points.
- the prism row when the length of the pitch P of the prism row in the cross section thereof is normalized to 1, the prism row is selected from the 16 points, 13 points, or 12 points. At least five points have a shape connected by using the above-mentioned neighboring points within a circle having a radius of 0.021 around the point.
- the length of the pitch P of the prism rows when the length of the pitch P of the prism rows is normalized to 1 when the ridge formed by the two prism faces constituting the prism row is 0.018 with respect to the reference line, It is formed in an uneven shape of ⁇ 0.354.
- two prism surfaces constituting the prism array when two prism surfaces constituting the prism array normalize the length of the pitch P of the prism array to 1, 0.01 with respect to a reference plane thereof. It is formed in an uneven shape of 2 to 0.334.
- a flat portion is provided between adjacent prism rows.
- the flat portion is provided at a position of 2 to 10 m from the prism valley in the length direction of the prism row.
- when the flat portion normalizes the length of the pitch P of the prism rows to 1, 0.035 to 0.35 from the prism valley in the height direction of the prism rows. It is provided at position 18.
- the flat portion when the flat portion normalizes the length L2 of an imaginary straight line connecting the prism top and the prism valley to 1 in the cross-sectional shape of the prism surface at the top distribution angle, It is provided at a position of 0.022 to 0.16 in the height direction of the prism row from the prism trough.
- the light incident surface has a plurality of prism rows composed of two prism surfaces in parallel with each other. At least one of the two prism surfaces is formed of a non-single plane, and the apex distribution angle ⁇ of one of the prism surfaces constituting the prism array is 2 to 25 degrees and the top of the other prism surface When the distribution angle is 3 to 33 degrees and the ridge formed by the two prism surfaces is normalized to the length of the pitch ⁇ of the prism array to 1, the distance is 0.018 to 0.354 with respect to the reference surface.
- a light deflecting element characterized by being formed in a concave and convex shape
- the light incident surface has a plurality of prism rows composed of two prism surfaces in parallel with each other. At least one of the two prism surfaces is formed of a non-single plane, and the apex distribution angle ⁇ of one of the prism surfaces constituting the prism array is 2 to 25 degrees and the apex of the other prism surface is (Distribution angle) 3 is 33 to 40 degrees, and when the two prism surfaces normalize the length of the pitch ⁇ of the prism array to 1, it is 0.012 to A light deflecting element characterized in that it is formed in an uneven shape of 0.33 4;
- a primary light source a light guide having a light incident surface on which light emitted from the primary light source enters, and a light exit surface for guiding the incident light and emitting the guided light;
- a light source device comprising: the light deflecting element disposed so that the light incident surface is located opposite to the light exit surface of the light body.
- the light deflecting element is arranged such that the prism surface having a top split angle ⁇ of the prism array is closer to the primary light source, and the top split angle of the prism array being / 3.
- the prism surface is arranged farther from the primary light source, the primary light source is disposed adjacent to the corner portion of the light guide, and the prism rows of the light deflection element The primary light sources are arranged substantially concentrically about the center.
- the light deflecting device further includes a light diffusing element disposed adjacent to a light exit surface of the light deflecting element, and the light diffusing element has a different full width at half maximum of an emitted light distribution when parallel light is incident. It has anisotropy.
- FIG. 1 is a schematic perspective view showing a light source device according to the present invention.
- FIG. 2 is an explanatory diagram of the shape of the prism array on the light incident surface of the light deflecting element of the present invention.
- FIG. 3 is an explanatory diagram showing distributions of various emitted lights from the light deflection element.
- FIG. 4 is an explanatory diagram showing distributions of various emitted lights from the light deflection element.
- FIG. 5 is an explanatory diagram showing distributions of various emitted lights from the light deflection element.
- FIG. 6 is an explanatory diagram showing distributions of various emitted lights from the light deflection element.
- FIG. 7 is an explanatory diagram showing distributions of various emitted lights from the light deflection element.
- FIG. 8 is an explanatory diagram showing distributions of various emitted lights from the light deflection element.
- FIG. 9 is an explanatory view showing various light distributions from the light deflecting element.
- FIG. 10 is an explanatory diagram showing distributions of various emitted lights from the light deflection element.
- FIG. 11 is an explanatory diagram showing distributions of various emitted lights from the light deflection element.
- FIG. 12 is an explanatory diagram showing distributions of various emitted lights from the light deflection element.
- FIG. 13 is an explanatory diagram showing distributions of various emitted lights from the light deflection element.
- FIG. 14 is an explanatory diagram showing distributions of various emitted lights from the light deflection element.
- FIG. 15 is an explanatory view showing the difference in the refraction of light and the length of the prism cross section due to the difference in the inclination angle of the prism surface.
- FIG. 16 is an explanatory diagram showing the difference in the length of the cross section of the prism of light refraction due to the difference in the inclination angle of the prism surface.
- FIG. 17 is an explanatory diagram of the shape of the prism array on the light incident surface of the light deflecting element of the present invention.
- FIG. 18 is a perspective view in which a substantially point light source is disposed adjacent to a corner of a light guide.
- FIG. 19 is an explanatory diagram of the full width at half maximum of the emitted light distribution.
- FIG. 20 is an explanatory diagram of the shape of the prism array on the light incident surface of the light deflecting element of the present invention.
- Figure 1 is a schematic perspective view showing one embodiment of a surface light source device according to the present invention, a surface light source device of the invention of this embodiment, one of at least A light guide 3 whose side end surface is a light incident surface 31, and one surface substantially orthogonal to this is a light exit surface 33, and is disposed to face the light incident surface 31 of the light guide 3.
- a linear or rod-shaped primary light source 1 covered with a light source reflector 2, a light deflecting element 4 disposed on a light exit surface 3 3 of a light guide 3, and a light diffusing element 6 disposed thereon;
- the light reflecting surface 5 of the light body 3 is opposed to the back surface 34 opposite to the light emitting surface 5.
- the light guide 3 is arranged in parallel with the XY plane, and has a rectangular plate shape as a whole.
- the light guide 3 has four side end surfaces, of which at least one side end surface of a pair of side end surfaces parallel to the YZ plane is a light incident surface 31.
- the light incident surface 3 1 is disposed so as to face the primary light source 1, and the light emitted from the primary light source 1
- the primary light source may be arranged on another side end surface such as the side end surface 32 opposite to the light incident surface 31.
- the two main surfaces of the light guide 3 that are substantially perpendicular to the light incident surface 3 1 are each located substantially parallel to the XY plane, and one of the surfaces (the upper surface in the figure) is the light exit surface 3 3 .
- a rough surface is formed on at least one of the light emitting surface 3 3 and the back surface 3 4 on the opposite side.
- Directional light emitting function consisting of 10 directional light emitting sections and a lens surface in which a number of lens arrays such as a prism array, lenticular lens array, and V-shaped groove are formed in parallel with the light incident surface 31 in parallel
- the light incident surface 31 is orthogonal to the light incident surface 31 and the light emitting surface 33 while the light incident from the light incident surface 31 is guided through the light guide 3 by providing the portion. Emit light with directivity in the outgoing light distribution in the plane (XZ plane).
- this angle a is preferably 10 to 40 degrees, and the half value of the emission light distribution
- the total width is preferably set to 10 to 40 degrees.
- the rough surface or lens array formed on the surface of the light guide 3 may have an average inclination angle 0a according to IS 04 287 / 1-1984 in the range of 0.5 to 15 degrees.
- the average inclination angle 0a is more preferably in the range of 1 to 12 degrees, and more preferably in the range of 1.5 to 11 degrees. It is preferable that an optimum range of the average inclination angle 0a is set by the ratio (LZt) of the thickness (t) of the sepal body 3 to the length (L) of the direction in which the incident light propagates. In other words, when the light guide 3 has an L / t of more than 20 and about 200 or less,
- the average inclination angle 0a is preferably set to 0.5 to 7.5 degrees, more preferably 1 to 5 degrees, and more preferably 1.5 to 4 degrees.
- the average inclination angle ⁇ a is preferably set to 7 to 12 degrees, and more preferably in the range of 8 to 11 degrees. It is.
- the average inclination angle 0 a of the rough surface formed on the light guide 3 is represented by IS 04 2 8 7Z 1 — 1 9 8
- ⁇ a tan " 1 ( ⁇ a) ⁇ ⁇ ⁇ (2)
- the light guide 3 preferably has a light emission rate in the range of 0.5 to 5%, more preferably 1 to 3%. This is because when the light emission rate is less than 0.5%, the amount of light emitted from the light guide 3 tends to be small, and sufficient luminance cannot be obtained. When the light emission rate is more than 5%, the primary light source 1 A large amount of light exits in the vicinity of the light exit surface 33, the attenuation of light in the X direction on the light exit surface 33 becomes significant, and the uniformity of luminance on the light exit surface 33 tends to decrease. is there.
- the angle of the peak light (peak angle) in the light distribution of the light emitted from the light emission surface is normal to the light emission surface.
- High directivity such that the full width at half maximum of the emission light distribution on the XZ plane perpendicular to both the light entrance surface and the light exit surface is 10 to 40 degrees.
- Light with emission characteristics can be emitted from the light guide 3, the emission direction can be efficiently deflected by the light deflecting element 4, and a surface light source device having high luminance can be provided.
- the light emission rate from the light guide 3 is defined as follows.
- the light intensity (1.) of the outgoing light at the edge on the light incident surface 31 side of the light emitting surface 33 and the outgoing light intensity (I) at a distance L from the edge on the light incident surface 31 side Assuming that the thickness (dimension in the Z direction) of the light guide 3 is t, the following relationship (3) is satisfied.
- the constant A is the light emission rate, and the light guide per unit length (the length corresponding to the light guide thickness t) in the X direction orthogonal to the light incident surface 31 on the light output surface 33. This is the ratio (%) of light emitted from body 3.
- the light emission rate A is obtained from the gradient by plotting the logarithm of the light intensity of the light emitted from the light emission surface 23 on the vertical axis and (L / t) on the horizontal axis. be able to.
- the other main surface to which the directional light emitting function is not provided is provided in order to control the directivity of the light emitted from the light guide 3 in a plane (YZ plane) parallel to the primary light source 1.
- a lens array of a number of lens arrays extending in a direction (X direction) substantially perpendicular to the light incident surface 31 It is preferable to form a closed surface.
- a rough surface is formed on the light exit surface 33, and an array of a large number of lens arrays extending substantially perpendicularly (X direction) to the light incident surface 31 on the back surface 34. Is formed.
- a lens surface is formed on the light emitting surface 33, and the rear surface 34 is roughened.
- the lens array when a lens array is formed on the back surface 34 or the light emitting surface 33 of the light guide 3, the lens array includes a prism array extending substantially in the X direction, a lenticular lens array, and a V-shape.
- a groove may be used, but it is preferable that the YZ cross-section be a prism line having a substantially triangular shape.
- the apex angle be in the range of 70 to 150 degrees. This is because by setting the apex angle in this range, the light emitted from the light guide 3 can be sufficiently condensed, and the luminance of the surface light source device can be sufficiently improved. That is, by setting the prism apex angle within this range, the emission light distribution on the plane perpendicular to the XZ plane including the peak light in the emission light distribution
- the apex angle is preferably in the range of 80 to 100 degrees.
- the apex angle is preferred. Is preferably in the range of 70 to 80 degrees or 100 to 150 degrees.
- light diffusing fine particles are mixed into the light guide instead of or in combination with forming the light emitting function on the light emitting surface 33 or the back surface 34 as described above. It may have a directional light emission function by being dispersed.
- the light guide 3 is not limited to the cross-sectional shape shown in FIG. 1, but may have various cross-sectional shapes such as a wedge shape and a boat shape.
- FIG. 2 is an explanatory diagram of the shape of the prism array in the light deflecting element 4.
- the light deflecting element 4 has one of the main surfaces as a light incident surface 41 and the other surface as a light emitting surface 42.
- a number of prism rows are arranged in parallel on the light incident surface 41, and each prism row includes a first prism face 44 located on the light source side and a second prism face 45 located on the far side from the light source. It is composed of two prisms.
- the first prism located on the light source side and a second prism face 45 located on the far side from the light source. It is composed of two prisms.
- the first prism In the embodiment shown in FIG. 2, the first prism
- the second prism surface 45 has three planes having different inclination angles from each other. It is a non-single plane composed of surfaces 46 to 48, and the inclination angle of these three planes is larger as the plane is closer to the light exit surface 42.
- the inclination angle of the surface of the prism array refers to the inclination angle of each surface with respect to the prism array forming plane 43.
- the light deflecting element 4 has an apex distribution angle ⁇ of the first prism surface 44 of 2 to 25 degrees, a nodal distribution angle of the second prism surface 45 of 33 to 40 degrees, and a difference between ⁇ and ⁇ .
- the apex distribution angle ⁇ is a left / right distribution angle of the apex angle of the prism array with respect to the normal direction of the prism array formation plane 43, and the prism at the apex of the first prism surface 44.
- the angle between the normal direction of the row forming plane 43 and the normal direction of the prism row forming plane 43 at the top of the second prism surface 45 is defined as a.
- the prism surface is formed by two or more surfaces having a larger inclination angle as the surface is closer to the light exit surface 42, and the light emitted from the light exit surface 42 after being totally reflected by each surface. Extremely high brightness can be obtained by matching the peak angles of all surfaces.
- the difference in the inclination angle between the surface closest to the light emitting surface and the surface farthest from the light emitting surface is in the range of 1 to 15 degrees, preferably in the range of 5 to 12 degrees, more preferably 7 degrees. It is in the range of ⁇ 10 degrees.
- FIGS. 3 to 12 show that the two prism surfaces are both formed of a single plane and have an angle ⁇ and an angle (corresponding to the top distribution angle ⁇ and ⁇ ⁇ ⁇ ⁇ in the present invention) with respect to the normal direction of the light emitting surface.
- FIGS. 3 to 12 show a state in which incident light from the first prism surface is totally reflected by the second prism surface and exits from the light exit surface 42. The distribution of light emitted from each area is shown evenly divided into these areas.
- One The 0 areas are Part 1, Part 2,...
- the peak light is emitted in the normal direction of the prism row forming plane, as shown in FIG. 13, in the outgoing light distribution of the entire light that is totally reflected and emitted by the second prism surface.
- the peak angle is about _9 degrees in Part i and Part 2 (negative angle values are 0 degrees in the normal direction and This indicates that the light is emitted in the vicinity.)
- the peak light sequentially shifts toward the 0-degree direction (the normal direction of the prism array forming plane) in Part 3 to Part 7, and further, Part 8 to Part 1 At 0, it can be seen that the peak light is sequentially shifted in the positive angle direction.
- the peak angle of the outgoing light totally reflected in the area (Part i 0) closest to the outgoing light surface 42 is 7 degrees.
- the peak angle has a spread of 16 degrees between the areas (Part 1 to Part 10) on the second prism surface.
- the intensity of the peak light from each area gradually decreases from Part 1 power to Part 10 power.
- the light totally reflected and emitted by the prism surface composed of one plane is dispersed in a considerably wide range depending on the area of the prism surface that totally reflects.
- the peak light in the distribution of light emitted from each area is adjusted so that the inclination angle of the surface of each area is adjusted, and the light is emitted so that the peak angle is almost the same in all areas. Can be concentrated and emitted in a specific direction.
- the inclination angle of the prism surface in each area is set to be larger in the order of Part i force to Part 10, that is, the inclination angle is set to be larger in the area closer to the light emitting surface 42.
- the second prism surface 45 About 1.29 times the amount of light can be received by the second prism surface 45 compared to the case of 2.7 degrees. By reducing ⁇ in this manner, the amount of light that strikes the prism surface 45 increases, but if the second prism surface 45 is a single plane, the totally reflected light is efficiently directed substantially in the normal direction. Can not. For this reason, it is necessary to make the second prism surface 45 non-planar, for example, a curved surface, and / or to constitute some surface, for example, a flat surface.
- the number of areas formed on the prism surface is preferably in the range of 3 to 20 and more preferably in the range of 4 to 15. It is preferable that the division is performed evenly if the prism surface is divided into areas. However, it is not always necessary to divide the prism surface uniformly, and adjustment can be made according to a desired emission light distribution over the entire prism surface.
- ⁇ is in the range of 2 to 25 degrees, preferably 5 to 25 degrees, particularly 11 to 25 degrees, more preferably 11 to 20 degrees, and most preferably 12 to 15 degrees.
- ⁇ is 33 to 40 degrees, preferably 33.5 to 39.5 degrees, and more preferably 3 to 40 degrees.
- the range is 3.5 to 38 degrees, most preferably 34 to 38 degrees.
- the absolute value of the difference from ⁇ (Ia- ⁇ I) is 8 to 35 degrees, preferably 8 to 34.5 degrees, more preferably 13 to 27 degrees, and most preferably 19 to 37 degrees. 23 degrees.
- the peak angle ( ⁇ +) of the prism is also reduced in order to direct the peak angle substantially in the normal direction, so that the manufacturing tends to be difficult. Optical defects such as scratches and burrs are likely to occur in the rows.
- ⁇ is most preferably 5 degrees or more, and the cross-sectional shape in which the peak angle of the emitted light distribution for each surface is substantially the normal direction is most preferable.
- ⁇ is most preferably 5 degrees or more, and the cross-sectional shape in which the peak angle of the emitted light distribution for each surface is substantially the normal direction is most preferable.
- I ⁇ —] 3 I is too small If ⁇ is increased, the light condensing effect tends to be insufficient. If it is too large, ⁇ is reduced, and optical defects are likely to occur in the prism array during molding.
- Point 1 (-0.284, 1.059), Point 2 (0.000, 0.000), Point 3 (0.212, 0.278), Point 4 (0.265, 0.350), Point 5 (0.319, 0 ⁇ 423), Point 6 (0.372, 0.501 ), Point 7 (0.425, 0.581), point 8 (0.478, 0.663), point 9 (0.531, 0.748), point 10 (0.584, 0.834), point 11 (0.637, 0.922), point 1 2 (0.716, A shape composed of 11 planes of the cross-sectional shape connecting 12 points of 1.059) is also preferable. Point 1 (-0.206,1.168), Point 2
- the prism surface having the different inclination angles as described above may be a convex curved surface, and all surfaces may be convex curved surfaces. . That is, the prism surface is made up of one or more planes and one or more
- the second prism surface 45 is divided into four areas, and is composed of two flat surfaces 49, 50 and two convex curved surfaces 51, 52.
- the number of areas is, for example, 2 to 10 and preferably 2 to 10 as compared with the case where the prism surface is formed by planes having different inclination angles. Can be reduced to five. However, if the number of areas is too small, it becomes difficult to design each convex curved surface for adjusting a desired distribution of emitted light. Therefore, the number of areas is more preferably in the range of 3 to 4.
- the shape of the convex curved surface can be not only circular but also non-circular in the XY cross section. Further, when a prism surface is constituted by a plurality of convex curved surfaces, it is preferable that the shapes of the convex curved surfaces are different, and a convex curved surface having a circular cross section and a convex curved surface having a non-circular cross section can be combined. Examples of the non-circular shape include a part of an elliptical shape and a part of a parabolic shape.
- the angle of inclination in the case of a convex curved surface refers to the angle of inclination of the surface (corresponding to the chord of the convex curved portion in the cross-sectional shape) connecting the both edges of the convex curved surface with respect to the prism row forming plane 43.
- the top distribution angle refers to the angle between the surface connecting the both ends of the convex curved surface and the normal direction of the prism array forming plane 43.
- the amount of light received by the prism surface 45 is increased to form the prism array.
- the prism row has a small cut angle at the prism valley. For this reason, burrs are likely to occur in the prism valleys during manufacturing, and the prism valleys are streaks. Defects that look like may occur.
- the flat portion 59 is preferably provided at a position of 2 to 10 m in the height direction of the prism from the prism valley where the flat portion is not formed, and more preferably 2 5 to 5; x in, more preferably 3 to 4 m. If this position is less than 2 ⁇ m, it tends to be difficult to precisely process the cutting bytes that form the pattern of the prism rows into the mold, and if it exceeds 10 ⁇ , the brightness tends to decrease. is there.
- the position of the flat portion is 0.035 to 0 in the height direction.
- the length L 2 of the virtual straight line connecting the prism top and the prism valley is normalized to 1; It may be in the range of 0.022 to 0.16 in the height direction.
- the ridge formed by the two prism surfaces that make up the prism array is normalized to the length of the pitch ⁇ of the prism array to be 1, it is 0 with respect to the ridge base line (the line located at the average height of the prism array). It can also be formed in the form of irregularities of 0.18 to 0.354.
- the degree of unevenness of the ridge line relative to the reference line is preferably from 0.01 to 0.177, more preferably from 0.01 to 0.088, and still more preferably from 0.035 to 0.035. 0.03. This is because, in the light deflecting element capable of emitting incident light in a very concentrated manner in the observation direction as in the present invention, light close to parallel light is incident on a liquid crystal display element or the like.
- the glare that is visually recognized during observation can be prevented by making the ridges uneven in the ⁇ direction, and defects in the light guide plate and the light deflector are hardly visually recognized, resulting in poor brightness. This is useful for improving quality such as reducing uniformity.
- the ridge is made uneven, a slight gap is generated between the light guide plate and the light deflecting element. For this reason, the light emitted from the light guide plate impinges on the prism array on the side opposite to the light source from the prism array to be hit when there is no gap.
- the light emitted from the light guide closer to the normal line than the peak emission light is the prism.
- the luminance can be significantly increased by compensating for the decrease in luminance due to the unevenness of the ridge line. Drop can be prevented.
- the degree of unevenness of the ridge line be within the above range.
- the method for forming the ridge line in an uneven shape is not particularly limited.
- a method of molding using a lens mold that is cut while applying a specific vibration when forming a lens pattern by cutting, or grinding the ridge of each lens unit of a conventional lens sheet using a fine sandpaper It can be formed by a processing method or the like.
- the reference surface of the prism surface (the reference line of the ridge line and the bottom side of the prism surface (side on the valley side))
- the degree of unevenness with respect to the prism reference plane is preferably 0.012 to 0.152, more preferably 0.012 to 0.0706, and even more preferably 0.022 to 0.46. .
- the light guide 3 By placing the above-described light deflecting element 4 on the light exit surface 33 of the light guide 3 so that the prism row forming surface is on the light entrance surface side, the light guide 3 The distribution of the directional light emitted from the light emitting surface 33 in the XZ plane can be narrowed, and the brightness of the light source device can be increased.
- the prism array forming surface of the light deflecting element 4 is arranged to face the light emitting surface 33 of the light guide 3, the main reflecting surface of the prism array (far from the primary light source)
- the shape of the prism surface on the side is optimized and the length is increased, and when the light emitted from the light guide 3 enters the prism row, the incident light is reflected from the light exit surface 4 2 of the light deflecting element 4.
- the angle of inclination of the light incident surface of the prism array (the prism surface closer to the primary light source) so that it can be refracted away from the light source, by suppressing the dispersion of light in unnecessary directions
- the light use efficiency can be increased, the light can be emitted in a concentrated manner in a desired direction, and the brightness as a light source device can be significantly improved.
- the prism surface when the prism surface is composed of a plurality of planes or convex curved surfaces having different inclination angles, the top and bottom of the prism array must be separated in order to secure sufficient light-collecting characteristics.
- the maximum distance (d) between the connecting virtual plane and a plurality of planes or convex curved surfaces (actual prism surfaces) is defined as the ratio (d / d) to the prism row pitch (P).
- the content of P) is preferably 0.4 to 5%. This is because if (1 / :? is less than 0.4% or exceeds 5%, the light-collecting characteristics tend to decrease, and it tends to be impossible to achieve a sufficient luminance improvement.
- the radius of curvature (r) of the prism row is preferably in the range of 2 to 50, more preferably 5 to 30, and even more preferably 6.5 to 12. If P is less than 2 or exceeds 50, sufficient light-collecting characteristics cannot be exhibited, and the brightness tends to decrease.
- the full width at half maximum of the emission light distribution of the emission light from the light deflecting element 4 in the XZ plane is preferably 5 degrees or more and 25 degrees or less, and more preferably in the range of 10 to 20 degrees. Yes, more preferably in the range of 11 to 15 degrees. This is because by setting the full width at half maximum of the emitted light distribution to 5 degrees or more, it is possible to eliminate the difficulty of viewing an image or the like due to an extremely narrow visual field, and to achieve a high brightness by setting it to 25 degrees or less. It is possible.
- the primary light source 1 is a linear light source extending in the Y direction.
- the primary light source 1 for example, a fluorescent lamp or a cold cathode tube can be used.
- the primary light source 1 is not limited to a linear light source, and a point light source such as an LED light source, a halogen lamp, a metahalo lamp and the like can be used.
- a small point light source such as an LED.
- the primary light source 1 is not only installed on one side end face of the light guide 3 but may be further installed on the opposite side end face as needed. it can.
- the prism array formed on the light deflector 4 extends in a direction substantially parallel to the primary light source 1.
- primary light sources 1 and 20 It is formed so as to extend in the direction having the following inclination, but the arrangement of the prism array formed on the light deflecting element 4 can be changed according to the propagation direction of light propagating in the light guide 3 depending on the light source used. .
- FIG. 1 shows that when a linear light source is used as the primary light source 1, the prism array formed on the light deflector 4 extends in a direction substantially parallel to the primary light source 1. , Or primary light sources 1 and 20. It is formed so as to extend in the direction having the following inclination, but the arrangement of the prism array formed on the light deflecting element 4 can be changed according to the propagation direction of light propagating in the light guide 3 depending on the light source used. .
- the prism array formed on the light deflecting element 4 has a substantially arc shape so as to surround the primary light source 1. Are preferably arranged in parallel.
- the prism rows in a substantially arc shape in parallel so as to surround the primary light source 1, most of the light radially emitted from the light exit surface 33 is substantially aligned with the prism row of the light deflecting element 4. Since the light is incident perpendicularly, the emitted light can be efficiently directed to a specific direction in the entire region of the light exit surface 33 of the light guide 3, and the uniformity of the luminance can be improved.
- the substantially arc-shaped prism array formed on the light deflecting element 4 selects the degree of the arc in accordance with the distribution of light propagating in the light guide 3, and most of the light emitted radially from the light exit surface 33 is formed.
- the light be incident on the prism array of the light deflection element 4 substantially perpendicularly.
- substantially circular arcs are arranged side by side in a substantially concentric manner with a point light source such as an LED substantially at the center so that the radius of the circular arc gradually increases. It is determined by the position and size of the point light source in the surface light source system and the effective area of the surface light source corresponding to the liquid crystal display area.
- the light source reflector 2 guides the light of the primary light source 1 to the light guide 3 with less loss.
- the material c for example, a plastic film having a metal vapor deposition reflection layer on the surface can be used.
- the light source reflector 2 is wound from the outer surface of the edge of the light reflecting element 5 to the outer edge of the light diffusing element 6 via the outer surface of the primary light source 1.
- the light source reflector 2 avoids the light diffusing element 6 and the light deflecting element 4 and passes from the outer surface of the edge of the light reflecting element 5 to the light emitting surface of the light guide 3 via the outer surface of the primary light source 1. It is also possible to wrap around.
- a reflecting member similar to the light source reflector 2 can be attached to a side end surface other than the side end surface 31 of the light guide 3.
- the light reflection element 5 for example, a plastic sheet having a metal vapor deposition reflection layer on the surface can be used.
- the light reflection element 5 may be a light reflection layer or the like formed on the back surface 34 of the light guide 3 by metal evaporation or the like.
- the light guide 3 and the light deflecting element 4 of the present invention can be made of a synthetic resin having a high light transmittance.
- synthetic resins include methacrylic resins, acrylic resins, polycarbonate resins, polyester resins, and vinyl chloride resins.
- methacrylic resin is optimal because of its high light transmittance, heat resistance, mechanical properties, and moldability.
- methacrylic resin is a resin containing methyl methacrylate as a main component, and preferably contains 80% by weight or more of methyl methacrylate.
- the transparent synthetic resin plate is hot-pressed using a mold member having the desired surface structure. It may be formed by screen printing, or may be formed simultaneously with molding by screen printing, extrusion molding, or injection molding.
- the structural surface can be formed using a heat or photo-curable resin.
- a rough surface structure or a lens array structure made of active energy linear curing resin may be formed on the surface.
- the sheet may be bonded and integrated on a separate transparent substrate by a method such as adhesion or fusion.
- Active energy ray-curable resins include polyfunctional (meth) acrylic compounds, vinyl compounds, (meth) acrylic esters, aryl compounds,
- a liquid crystal display device is configured by disposing a liquid crystal display element on the surface of the light diffusing element (6).
- the liquid crystal display is a liquid crystal display
- the present invention since a sufficiently collimated light having a narrow distribution can be made to enter the liquid crystal display element from the surface light source device, the brightness and the hue are eliminated without gradation inversion in the liquid crystal display element. Image display with good uniformity of light can be obtained, and light irradiation concentrated in a desired direction can be obtained, so that the efficiency of using the amount of light emitted from the primary light source for illumination in this direction can be increased.
- the light diffusing element 6 can be arranged adjacent to the light exit surface of the light deflecting element 4. Further, in the present invention, by arranging the light diffusing element 6 in this way, it is possible to suppress glare, luminance unevenness, and the like that cause deterioration in quality.
- the light diffusing element 6 may be integrated with the light deflecting element 4 on the light emitting surface side of the light deflecting element 4, or the light diffusing elements 6 may be individually arranged on the light emitting surface side of the light deflecting element 4. Although it is preferable, it is preferable to dispose the light diffusing elements 6 individually. When the light diffusing elements 6 are individually installed, the surface of the light diffusing element 6 adjacent to the light deflecting element 4
- a light diffusing element 6 having a light diffusing property for appropriately diffusing light emitted from the light deflecting element 4 in consideration of balance of luminance characteristics, visibility, quality, and the like. is there.
- the light diffusing property of the light diffusing element 6 is low, it is difficult to sufficiently widen the viewing angle, thereby lowering visibility and improving quality.
- the effect of narrowing the visual field is impaired, and the total light transmittance tends to decrease, resulting in a decrease in luminance. Therefore, as the light diffusing element 6 of the present invention, an element in which the full width at half maximum of the emitted light distribution when parallel light is incident is in the range of 1 to 13 degrees is used.
- the full width at half maximum of the light diffusion element 6 is preferably in the range of 3 to 11 degrees, more preferably 4 degrees.
- the full width at half maximum of the emission light distribution of the light diffusion element 6 indicates, as shown in FIG. 19, how much a parallel light beam incident on the light diffusion element 6 diffuses and spreads when emitted.
- Such a light diffusion property can be provided by mixing a light diffusion agent into the light diffusion element 6 or by providing an uneven structure on at least one surface of the light diffusion element 6.
- the degree of the concave ⁇ structure formed on the surface differs between the case where it is formed on one surface of the light diffusion element 6 and the case where it is formed on one surface.
- the average inclination angle is in the range of 0.8 to 12 degrees.
- the average inclination angle of the uneven structure formed on one surface is preferably set to 0.8 to 6 degrees, more preferably 2 to 6 degrees. It is 4 degrees, more preferably 2.5-4 degrees.
- the average inclination angle on the incident surface side of the light diffusion element 6 be larger than the average inclination angle on the emission surface side.
- the haze value of the light diffusing element 6 is preferably in the range of 8 to 82% 1 from the viewpoint of improving the luminance characteristics and visibility, more preferably in the range of 30 to 70%, and more preferably. Ranges from 40 to 65%.
- the light source device of the present invention is also required to have uniform brightness in the display area when observed from the normal direction of the light emitting surface (the light emitting surface of the light diffusing element 6).
- the uniformity of the luminance also depends on the size of the display area of the light source.
- a large light source device having a large display area such as a notebook computer monitor may require a relatively wide viewing angle characteristic. It is required to further broaden the distribution of light emitted from the light emitting surface.
- a small light source device such as a mobile phone or a portable information terminal having a small display area, high luminance and improvement in display quality may be given priority, and the distribution of light emitted from the light emitting surface may be relatively narrow. .
- light emitted from the light guide 3 is emitted in a specific direction such as a normal direction using the light deflection element 4, and the emitted light is emitted using the light diffusion element 6 having anisotropic diffusion property. It can also be emitted in a desired direction.
- both functions of anisotropic diffusion and light deflection can be provided to the light diffusion element 6.
- both functions of anisotropic diffusion action and light deflection action can be provided.
- the light deflecting element 4 and the light diffusing element 6 may contain a light diffusing material for the purpose of adjusting the viewing angle as the light source device and improving the quality.
- a light diffusing material transparent fine particles having a different refractive index from the material constituting the light deflecting element 4 and the light diffusing element 6 can be used.
- the light diffusing material the content, the particle diameter, the refractive index, and the like need to be appropriately selected so as not to impair the narrow visual field effect by the light deflecting element 4 and the appropriate diffusion effect by the light diffusing element 6.
- the refractive index of the light diffusing material is too small, the diffusion effect is small, and if it is too large, excessive scattering and refraction occurs.
- the refractive index difference is preferably in the range of 0.01 to 0.1, more preferably in the range of 0.3 to 0.08, and even more preferably in the range of 0.3 to 0.05. is there. If the particle size of the light diffusing material is too large, scattering becomes strong, causing glare and a decrease in brightness.If the particle size is too small, coloring occurs, so the average particle size is 0.5 to 20. / zm, more preferably 2 to 15 ⁇ m, and still more preferably 2 to 10; im.
- the emission light distribution of the light source device using the light deflecting element as in the present invention is such that, at the peak position, as the emission light distribution on the primary light source side becomes farther from the peak light, the brightness sharply decreases,
- the emission light distribution farther from the primary light source may exhibit an asymmetric emission light distribution in which the luminance decreases relatively slowly.
- a light source device having such an emitted light distribution is used for a liquid crystal display device requiring a relatively wide viewing angle, such as a notebook personal computer having 10 inches or more
- a light diffusion device having a relatively high light diffusion property is required.
- An element is arranged on the light exit surface of the light deflecting element, and the outgoing light distribution is widened to widen the viewing angle.
- the peak angle of the emitted light distribution is deflected about 1 to 3 degrees away from the primary light source. For this reason, when the peak angle of the light distribution emitted from the light deflection element is located in the normal direction of the light exit surface, the light diffusion element causes the peak angle of the light distribution to be about 1 to 3 degrees from the normal direction from the light source. It is polarized to the far side, resulting in a drastic reduction in brightness when viewed from the normal direction.
- the part of the emitted light distribution where the luminance decreases relatively sharply is in the normal direction. Because it is located. In order to avoid such a drastic decrease in luminance, it is preferable to previously incline the peak angle of the light distribution emitted from the light deflecting element by 1 to 3 degrees from the normal direction toward the light source.
- the luminance distribution of the emitted light was measured with a luminance meter while rotating at intervals, and the peak luminance and peak angle were determined.
- the peak angle was set to 0 ° in the direction normal to the light source device, negative on the primary light source side, and positive on the opposite side.
- a light guide having a mat (an average inclination angle of 1.1 degrees) on one side was produced by injection molding using an acrylic resin (Ataripet VH5 # 0000, manufactured by Mitsubishi Rayon Co., Ltd.).
- the light guide had a wedge plate shape of 21.6 mm ⁇ 290 mm and a thickness of 2.0 mm-0.7 mm.
- the prism vertex angle of the prism row is 100 °
- pitch is made of acrylic UV curable resin so as to be parallel to the side (short side) of the light guide, which is 2 16 mm in length.
- a prism layer in which 50 incidentm prism rows were arranged in parallel was formed, and one side end face (thickness 2.
- the top distribution angle ⁇ was 15 degrees, and the top distribution angle was 37.4 degrees.
- the inclination angles of the plane 10 corresponding to points 2 to 12 are 52.6 degrees, 53.5 degrees, 54.3 degrees, 55.5 degrees, 56.3 degrees, and 57. 1 degree, 57.9 degree, 58.4 degree, 58.9 degree, 60.0 degree.
- the ratio dZP of the maximum distance d between the imaginary plane connecting the top and bottom of the prism array and the actual prism surface corresponding to points 12 to d to the prism array pitch P was 2.7%.
- the degree of irregularity of the prism ridge line with respect to the reference line was 0.053, and the degree of irregularity of the prism surface with respect to the reference surface was 0.036.
- the obtained prism sheet had almost no optical defects or the like caused by the formation of the prism rows.
- the obtained prism sheet is placed on the first prism surface (point 1 and point 1) with the prism row forming surface facing the light exit surface side of the light guide, the prism ridge line parallel to the light entrance surface of the light guide.
- the top distribution angle ⁇ was 10 degrees, and the top distribution angle i3 was 38 degrees.
- the inclination angles of the plane 1 1 corresponding to points 2 to 13 are 52.0 degrees, 52.6 degrees, 52.8 degrees, 53.7 degrees, and 54.5 degrees, respectively.
- 5 5.3 degrees, 5 6.1 degrees, 5 6.8 degrees, 5 7.5 degrees, 5 8.4 degrees, with respect to the prism row pitch P of c prism sheet was 6 0.0 °
- the ratio of the maximum distance d between the imaginary plane connecting the top and bottom of the prism array to the actual prism surface corresponding to points 13 to 13 with respect to the prism array pitch d is 3.3%.
- the degree of unevenness of the prism ridge line relative to the reference line was 0.053, and the degree of unevenness of the prism surface relative to the reference surface was 0.036.
- the obtained prism sheet had some optical defects due to the formation of the prism rows and the like.
- the prism sheet thus obtained is placed such that the prism array forming surface faces the light emitting surface side of the light guide of Example 1, the prism ridge line is parallel to the light incident surface of the light guide, and the first prism surface is the light source.
- the surface light source device was obtained.
- the outgoing light luminance distribution in a plane perpendicular to both the light incident surface and the light emitting surface of this surface light source device was obtained, and the peak luminance ratio, peak angle, and peak luminance were calculated based on Comparative Example 1.
- the angle having luminance full width at half maximum
- liquid crystal display element was arranged on the surface light source device and observed, it was of high quality without glare.
- the top distribution angle ⁇ was 10 degrees
- the top distribution angle i3 was 38 degrees
- the inclination angles of two planes corresponding to points 2 to 4 and two convex surfaces corresponding to points 4 to 6 are 52.0 degrees, 52.7 degrees, 56.1 degrees, 59.6 degrees.
- the ratio dZP of the maximum distance d between the virtual plane connecting the top and bottom of the prism array and the actual prism surface corresponding to points 2 to 6 to the prism array pitch P was 3.1%.
- the degree of irregularity of the prism ridge line with respect to the reference line is 0.053, and the prism
- the degree of irregularity of the ten surfaces relative to the reference surface was 0.036.
- the resulting prism sheet had some optical defects due to the formation of the prism rows and the like.
- the obtained prism sheet is placed such that the prism row forming surface faces the light exit surface side of the light guide of Example 1, the prism ridge line is parallel to the light incident surface of the light guide, and the first prism surface faces the light source.
- a surface light source device was obtained. The light incident surface of this surface light source device and
- liquid crystal display element was arranged on the surface light source device and observed, it was of high quality without glare.
- the cross section is point 1 (-6.292, 71.920), point 2 (0.000, 0.000), point 3 (9.000, 10.996), point 4 (12.000, 14.687), point 5 (15.000, 18.527), point 6 (18.000, 22.494), point 7 (21.000, 26.563), point 8 (24.000, 30.753), point 9 (27.000,35.070), point 10 (30.000,39.517), point 1 1 (33.000, 44 Point 1 2
- the ratio d / P of the maximum distance d between the imaginary plane connecting the top and bottom of the prism array and the actual prism surface corresponding to points 16 to 16 to the prism array pitch P is 3.7%.
- the degree of H0 convexity of the prism ridge line with respect to the reference line was 0.053, and the degree of irregularity of the prism surface with respect to the reference surface was 0.036.
- the obtained prism sheet had some optical defects due to the formation of the prism rows and the like.
- the obtained prism sheet is placed such that the prism row forming surface faces the light exit surface side of the light guide of Example 1, the prism ridge line is parallel to the light incident surface of the light guide, and the first prism surface faces the light source.
- a surface light source device was obtained.
- the luminance distribution of the emitted light in a plane perpendicular to both the light entrance surface and the light exit surface of this surface light source device was obtained, and the peak luminance ratio, peak angle, and 1/2 of the peak luminance based on Comparative Example 1 were determined.
- the angle (full width at half maximum) having the luminance of was measured, and the results are shown in Table 1.
- liquid crystal display element was arranged on the surface light source device and observed, it was of high quality without glare.
- a prism sequence is composed of three planes whose cross-sections connect the four points of point 1 (-6.322, 72.265), point 2 (0.000, 0.000), point 3 (12.000,14.687), and point 4 (15.000, 18.527), A circle with a radius of 376.827 centered on point A (-283.909, 247.987) from point 4 to point 5 (30.000, 39.517), and a point B (-376.959, 312.857) from point 5 to point 6 (50.178, 72.265)
- a prism sheet was manufactured in the same manner as in Example 4 except that the prism sheet was composed of two convex curved surfaces connected by a circle having a center and a radius of 490.235.
- the top distribution angle was 5 degrees
- the nodal distribution angle 3 was 39.3 degrees.
- the inclination angles of two planes corresponding to points 2 to 4 and two convex surfaces corresponding to points 4 to 6 are 50.7 degrees, 52.0 degrees,
- the ratio dP of the maximum distance d between the virtual plane connecting the top and bottom of the prism array and the actual prism surface corresponding to points 2 to 6 to the prism array pitch P was 3.9%.
- the degree of irregularity of the prism ridge line with respect to the reference line was 0.053, and the degree of irregularity of the prism surface with respect to the reference surface was 0.036.
- the resulting prism sheet had some optical defects due to the formation of the prism rows and the like.
- the obtained prism sheet is placed such that the prism row forming surface faces the light exit surface side of the light guide of Example 1, the prism ridge line is parallel to the light incident surface of the light guide, and the first prism surface faces the light source.
- a surface light source device was obtained.
- the luminance distribution of the emitted light in a plane perpendicular to both the light incident surface and the light exit surface of this surface light source device was obtained, and the peak luminance ratio, peak angle, and peak luminance were calculated based on Comparative Example 1.
- the angle (full width at half maximum) having a luminance of / 2 was measured, and the results are shown in Table 1.
- liquid crystal display element was arranged on the surface light source device and observed, it was of high quality without glare.
- the prism array is composed of a plane that connects two points, the cross-section of which is point 1 (-11.596, 65.767) and point 2 (0 ⁇ 000, 0 ⁇ 000), point 2 to point 3 (44.904, 65.767) Example except that the point A (-361.105, 294.766) and one convex surface connected by a circle of radius 466.137 centered on point A
- a prism sheet was produced in the same manner as in 1.
- the nodal distribution angle ⁇ was 10 degrees, and the top distribution angle was 34.3 degrees.
- the inclination angle of one convex surface corresponding to points 2 to 3 was 55.7 degrees.
- the ratio d / P of the maximum distance d between the imaginary plane connecting the term part and the bottom of the prism array to the actual prism surface corresponding to points 2 to 3 with respect to the prism array pitch P is 3.0%. I got it.
- the degree of irregularity of the prism ridge line with respect to the reference line was 0.053, and the degree of irregularity of the prism surface with respect to the reference surface was 0.036.
- the resulting prism sheet had some optical defects due to the formation of the prism rows and the like.
- the obtained prism sheet is placed on the light guide surface side of the light guide of Example 1, with the prism row forming surface facing the light exit surface side, the prism ridge line parallel to the light incident surface of the light guide body, and the first prism surface facing the light entrance surface.
- the surface light source device was obtained by placing the device on the 282 source side. The luminance distribution of the emitted light in a plane perpendicular to both the light entrance surface and the light exit surface of this surface light source device was obtained, and the peak luminance ratio, peak angle, and 1/2 of the peak luminance based on Comparative Example 1 were determined. The angle (full width at half maximum) having the luminance of was measured, and the results are shown in Table 1.
- the prism array is composed of a plane connecting the two points, point 1 (-16.005, 59.730) and point 2 (0.000, 0.000), and point 2 to point 3 (30.000,42.238).
- a prism sheet was produced in the same manner as in Example 1 except that the prism sheet was composed of two convex curved surfaces.
- the top distribution angle ⁇ was 15 degrees, and the top distribution angle was 35.4 degrees.
- the inclination angles of the two convex surfaces corresponding to points 2 to 4 were 54.6 degrees and 59.0 degrees, respectively.
- the ratio d / P of the maximum distance d between the virtual plane connecting the top and bottom of the prism array and the actual prism surface corresponding to points 2 to 4 to the prism array pitch P was 2.5%.
- the degree of irregularity of the prism ridge line relative to the reference line was 0.053, and the degree of irregularity of the prism surface relative to the reference surface was 0.036.
- the obtained prism sheet had almost no optical defects or the like due to the formation of the prism rows.
- the prism sheet thus obtained is placed such that the prism array forming surface faces the light emitting surface side of the light guide of Example 1, the prism ridge line is parallel to the light incident surface of the light guide, and the first prism surface is the light source.
- a surface light source device was obtained.
- the luminance distribution of the emitted light in a plane perpendicular to both the light entrance surface and the light exit surface of this surface light source device was obtained, and the peak luminance ratio, peak angle, and 1/2 of the peak luminance based on Comparative Example 1 were determined.
- the angle (full width at half maximum) having the luminance of was measured, and the results are shown in Table 1.
- the prism array is composed of a single plane connecting the two points, the cross section of which is point 1 (-14. 1776, 61.4101) and point 2 (0.000, 0.000), and a point 3 (42 3224, 61. 4101)
- the prism sheet was fabricated in the same manner as in Example 1, except that the prism sheet up to was composed of a circle with a radius of 5 04. 3237 centered at point A (-392. 9609, 3 16.1078). Produced. In this prism sheet, the nodal distribution angle ⁇ was 13 degrees, and the top distribution angle was 34.6 degrees.
- the ratio of the maximum distance d between the virtual plane connecting the top and bottom of the prism array and the actual prism surface corresponding to points 2 to 4 to the prism array pitch P d ZP is 2.4%, and its radius of curvature is
- the ratio r ZP of r to the prism row pitch P was 8.93.
- the degree of irregularity of the prism ridge line with respect to the reference line was 0.053, and the degree of irregularity of the prism surface with respect to the reference surface was 0.036.
- the obtained prism sheet had almost no optical defects or the like due to the formation of the prism rows.
- the prism sheet thus obtained is placed such that the prism array forming surface faces the light emitting surface side of the light guide of Example 1, the prism ridge line is parallel to the light incident surface of the light guide, and the first prism surface is the light source.
- a surface light source device was obtained.
- the luminance distribution of the emitted light in a plane perpendicular to both the light incident surface and the light exit surface of this surface light source device was obtained, and the peak luminance ratio, peak angle, and peak luminance were calculated based on Comparative Example 1.
- the angle (full width at half maximum) having the luminance of No. 2 was measured, and the results are shown in Table 1.
- liquid crystal display element was arranged on the surface light source device and observed, it was of high quality without glare.
- a prism sheet was produced in the same manner as in Example 8, except that the prism array was such that a flat portion was provided at a position of 3 ⁇ m from the trough of the prism in the height direction of the prism.
- the prism sheet thus obtained is placed such that the prism array forming surface faces the light emitting surface side of the light guide of Example 1, the prism ridge line is parallel to the light incident surface of the light guide, and the first prism surface is the light source.
- a surface light source device was obtained.
- the luminance distribution of the emitted light in a plane perpendicular to both the light entrance surface and the light exit surface of this surface light source device was obtained, and the comparative example 1 was used as a reference.
- the peak luminance ratio, the peak angle, and the angle having a peak luminance of 1 to 2 (full width at half maximum) were measured, and the results are shown in Table 1.
- liquid crystal display element was arranged on the surface light source device and observed, it was of high quality without glare.
- a prism sheet was produced in the same manner as in Example 8, except that the prism array was such that a flat portion was provided at a position 5 m from the trough of the prism in the height direction of the prism.
- the prism sheet thus obtained was placed on the light guide of Example 1 with the prism row forming surface facing the light exit surface, the prism ridge line parallel to the light incident surface of the light guide, and the first prism surface facing the light source.
- a surface light source device was obtained.
- the luminance distribution of the emitted light in a plane perpendicular to both the light incident surface and the light exit surface of this surface light source device was obtained, and the peak luminance ratio, peak angle, and peak luminance were calculated based on Comparative Example 1.
- the angle (full width at half maximum) having a luminance of 2 was measured, and the results are shown in Table 1.
- liquid crystal display element was arranged on the surface light source device and observed, it was of high quality without glare.
- a prism sheet was produced in the same manner as in Example 8, except that the prism array was such that a flat portion was provided at a position 7 ⁇ m from the trough of the prism in the height direction of the prism.
- the obtained prism sheet is placed on the light exit surface side of the light guide of Example 1 with the prism row formation 2D surface facing, the prism ridge line is parallel to the light entrance surface of the light guide, and the first prism surface is located at the light source. And a surface light source device was obtained.
- a prism sheet is formed on the light exit surface side of the light guide of the first embodiment.
- 2003/015282 The surface was oriented so that the prism ridge was parallel to the light incident surface of the light guide and the first prism surface was on the light source side, to obtain a surface light source device.
- the luminance distribution of the emitted light in a plane perpendicular to both the light incident surface and the light exit surface of this surface light source device was obtained, and the peak luminance ratio, peak angle, and peak luminance were calculated based on Comparative Example 1.
- An angle 5 (full width at half maximum) having a luminance of / 2 was measured, and the results are shown in Table 1.
- liquid crystal display element was arranged on the surface light source device and observed, it was of high quality without glare.
- a prism sheet was fabricated in the same manner as in Example 1 except that the circle up to was composed of a circle with a radius of 468.9511, centered at point A (-368.9514, 289.4066). did.
- the top distribution angle ⁇ was 20 degrees
- the top distribution angle 3 was 33.8 degrees.
- the ratio d / P of the maximum distance d between the virtual plane connecting the top and bottom of the prism array to the actual prism surface corresponding to points 2 to 4 with respect to the prism array pitch P is 2.3%, and its curvature is
- the ratio r / P of the radius r to the prism row pitch P was 8.30.
- the degree of irregularity of the prism ridge line with respect to the reference line was 0.053, and the degree of ⁇ 2D convexity of the prism surface with respect to the reference plane was 0.036.
- the obtained prism sheet had almost no optical defects or the like due to the formation of the prism rows.
- the obtained prism sheet is placed such that the prism row forming surface faces the light exit surface side of the light guide of Example 1, the prism ridge line is parallel to the light incident surface of the light guide, and the first prism surface faces the light source.
- a surface light source device was obtained. The light incident surface of this surface light source device and
- liquid crystal display element was arranged on the surface light source device and observed, it was of high quality without glare.
- a surface light source device was obtained in the same manner as in Example 1. The luminance distribution of the emitted light in a plane perpendicular to both the light incident surface and the light exit surface of this surface light source device is determined, the peak luminance is set to 1.0, the peak angle, and the luminance of 1 ⁇ 2 of the peak luminance. Was measured (full width at half maximum), and the results are shown in Table 1.
- Example 1 except that the prism array of the prism sheet was such that the two prism surfaces were both flat, the top distribution angle ⁇ of one surface was 5 degrees, and the term distribution angle J3 of the other surface was 38 degrees.
- a surface light source device was obtained in the same manner as in 1. The luminance distribution of the emitted light in a plane perpendicular to both the light incident surface and the light exit surface of this surface light source device was obtained, and the peak luminance ratio, peak angle, and peak luminance were calculated based on Comparative Example 1. The angle (full width at half maximum) having a luminance of / 2 was measured, and the results are shown in Table 1.
- Example 1 except that the prism array of the prism sheet was such that the two prism surfaces were both flat, the top distribution angle ⁇ of one surface was 5 degrees, and the top distribution angle 3 of the other surface was 35 degrees.
- a surface light source device was obtained.
- the luminance distribution of the emitted light in a plane perpendicular to both the light incident surface and the light exit surface of this surface light source device was obtained, and the peak luminance ratio, peak angle, and peak luminance were calculated based on Comparative Example 1.
- the angle (full width at half maximum) having a luminance of 2 was measured, and the results are shown in Table 1.
- the pre-forming device formed on the light incident surface of the light deflecting element As described above, according to the present invention, the pre-forming device formed on the light incident surface of the light deflecting element
- At least one of the prism surfaces constituting the 2D prism array is a non-single plane, the top distribution angle ⁇ of one prism surface is 2 to 25 degrees, and the top distribution angle of the other prism surface is 3
- ⁇ - 1 ⁇ I) between the top distribution angle ⁇ and the term distribution angle; 3 to 8 to 35 degrees the light emitted from the primary light source can be used as a required observation method.
Abstract
Description
Claims
Priority Applications (1)
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US10/538,008 US7578607B2 (en) | 2002-12-06 | 2003-11-28 | Light deflector and light source device |
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JP2002-355275 | 2002-12-06 | ||
JP2002355275 | 2002-12-06 | ||
JP2003028387A JP2004233938A (ja) | 2002-08-02 | 2003-02-05 | 光偏向素子及び光源装置 |
JP2003-28387 | 2003-02-05 |
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KR (1) | KR100977941B1 (ja) |
WO (1) | WO2004053539A1 (ja) |
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JP5011676B2 (ja) * | 2005-08-12 | 2012-08-29 | 株式会社日立製作所 | 表示装置を備える機器 |
JP4962884B2 (ja) * | 2006-06-06 | 2012-06-27 | 三国電子有限会社 | 面光源装置ならびにプリズムシートと液晶表示装置 |
US8049689B2 (en) * | 2007-05-31 | 2011-11-01 | Motorola Mobility, Inc. | Devices and methods for synchronized illumination |
US7957082B2 (en) * | 2007-10-03 | 2011-06-07 | Skc Haas Display Films Co., Ltd. | Turning film having multiple slopes |
US8087793B2 (en) * | 2007-10-30 | 2012-01-03 | Edward Pakhchyan | Back-light assembly |
RU2454689C2 (ru) * | 2008-02-15 | 2012-06-27 | Шарп Кабусики Кайся | Модуль задней подсветки и жидкокристаллическое дисплейное устройство |
US8248554B2 (en) | 2009-06-19 | 2012-08-21 | Apple Inc. | Edge-lit backlight unit with thin profile |
USD749774S1 (en) * | 2014-12-03 | 2016-02-16 | Anthony I. Provitola | Reflector for hidden light strip |
WO2018129034A1 (en) * | 2017-01-04 | 2018-07-12 | 3M Innovative Properties Company | Asymmetric turning film with top-hat light output distributions |
JP7017473B2 (ja) * | 2018-05-31 | 2022-02-08 | スタンレー電気株式会社 | 面光源装置 |
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JPH078804U (ja) * | 1993-06-29 | 1995-02-07 | 恵和商工株式会社 | 光拡散シート材 |
JPH07230002A (ja) * | 1994-02-17 | 1995-08-29 | Mitsubishi Rayon Co Ltd | 輝度向上透明シート |
JPH08304607A (ja) * | 1995-05-09 | 1996-11-22 | Toshiba Corp | バックライト |
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US5303322A (en) | 1992-03-23 | 1994-04-12 | Nioptics Corporation | Tapered multilayer luminaire devices |
CA2099067C (en) * | 1993-06-23 | 2001-02-13 | Makoto Oe | Plane light source unit |
JP3272106B2 (ja) | 1993-06-25 | 2002-04-08 | 株式会社キャタラー | ガス浄化装置 |
JPH09105804A (ja) * | 1995-10-13 | 1997-04-22 | Konica Corp | 光制御シート、面光源装置及び液晶表示装置 |
EP1306610B1 (en) * | 1995-11-06 | 2006-05-03 | Seiko Epson Corporation | Lighting apparatus, liquid crystal display system using it and electronic equipment using the liquid crystal display system |
JP4053626B2 (ja) | 1997-03-11 | 2008-02-27 | 株式会社エンプラス | 面光源装置並びに非対称プリズムシート |
JP3422917B2 (ja) * | 1997-11-05 | 2003-07-07 | 株式会社エンプラス | サイドライト型面光源装置及び液晶表示装置 |
JPH11142622A (ja) * | 1997-11-13 | 1999-05-28 | Dainippon Printing Co Ltd | レンズフィルム、面光源装置、液晶表示装置 |
JP2001143515A (ja) | 1999-09-03 | 2001-05-25 | Mitsubishi Rayon Co Ltd | プリズムシートおよび面光源素子 |
JP4242090B2 (ja) * | 2000-11-08 | 2009-03-18 | 三菱レイヨン株式会社 | 面光源装置 |
JP4266551B2 (ja) * | 2000-12-14 | 2009-05-20 | 三菱レイヨン株式会社 | 面光源システムおよびそれに用いる光偏向素子 |
JP4011287B2 (ja) * | 2000-12-25 | 2007-11-21 | 株式会社エンプラス | 光制御シート、面光源装置及び液晶ディスプレイ |
-
2003
- 2003-11-28 US US10/538,008 patent/US7578607B2/en active Active
- 2003-11-28 WO PCT/JP2003/015282 patent/WO2004053539A1/ja active Application Filing
- 2003-11-28 KR KR1020057010084A patent/KR100977941B1/ko active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH078804U (ja) * | 1993-06-29 | 1995-02-07 | 恵和商工株式会社 | 光拡散シート材 |
JPH07230002A (ja) * | 1994-02-17 | 1995-08-29 | Mitsubishi Rayon Co Ltd | 輝度向上透明シート |
JPH08304607A (ja) * | 1995-05-09 | 1996-11-22 | Toshiba Corp | バックライト |
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US7578607B2 (en) | 2009-08-25 |
US20080055926A1 (en) | 2008-03-06 |
KR20050085345A (ko) | 2005-08-29 |
KR100977941B1 (ko) | 2010-08-24 |
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