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WO2014192618A1 - 配置パターンの設計方法、導光板の製造方法、面光源装置の製造方法及び透過型画像表示装置の製造方法 - Google Patents

配置パターンの設計方法、導光板の製造方法、面光源装置の製造方法及び透過型画像表示装置の製造方法 Download PDF

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Publication number
WO2014192618A1
WO2014192618A1 PCT/JP2014/063494 JP2014063494W WO2014192618A1 WO 2014192618 A1 WO2014192618 A1 WO 2014192618A1 JP 2014063494 W JP2014063494 W JP 2014063494W WO 2014192618 A1 WO2014192618 A1 WO 2014192618A1
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WO
WIPO (PCT)
Prior art keywords
guide plate
light
virtual
light guide
arrangement pattern
Prior art date
Application number
PCT/JP2014/063494
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English (en)
French (fr)
Japanese (ja)
Inventor
健太郎 百田
Original Assignee
住友化学株式会社
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
Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to KR1020157037159A priority Critical patent/KR20160016952A/ko
Priority to CN201480030329.0A priority patent/CN105247270A/zh
Publication of WO2014192618A1 publication Critical patent/WO2014192618A1/ja

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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
    • G02B6/0065—Manufacturing aspects; Material aspects
    • 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
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • 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
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity

Definitions

  • the present invention relates to a layout pattern design method, and further relates to a light guide plate manufacturing method, a surface light source device manufacturing method, and a transmissive image display device manufacturing method.
  • transmissive image display device such as a liquid crystal display device
  • a surface light source device backlight device
  • a light source is provided along the side surface of the light guide plate, and the surface light source device is called an edge light type surface light source device.
  • the edge light type surface light source device In the edge light type surface light source device, light incident from the side surface of the light guide plate propagates while repeating total reflection inside the light guide plate, and part of the light propagating in the light guide plate is It is reflected and diffused (scattered) by the action of the arrangement pattern provided on the back side.
  • the surface light source device outputs planar light when light having an angle component equal to or greater than the critical angle is emitted from the emission surface of the light guide plate.
  • a gradation in which the density of the light distribution pattern is increased from coarse to dense as the distance from the light source increases.
  • Patent Document 1 also discloses a method of forming a dot-like light distribution pattern by droplet discharge (for example, ink jet printing). For example, in an inkjet printing method, printing may be performed by arranging a plurality of inkjet heads in order to shorten the printing tact.
  • droplet discharge for example, ink jet printing
  • the main object of the present invention is to provide a light scattering dot arrangement pattern design method, a light guide plate manufacturing method, a surface light source device manufacturing method, and a transmissive image display device manufacturing, in which light scattering dot pattern unevenness is unlikely to occur. Is to provide a method.
  • An arrangement pattern designing method is a guide in which a plurality of light scattering dots for scattering light are provided on a dot formation surface which is one surface of a light guide plate substrate that propagates light.
  • This is a method for designing an arrangement pattern of the plurality of light scattering dots on the light plate.
  • a dot formation surface is virtually divided into a plurality of virtual regions, and a coverage rate setting step for setting a coverage rate for each virtual region, and a plurality of virtual cells and light scattering dots for each virtual region.
  • the initial placement pattern creation process for creating the initial placement pattern of light scattering dots, and applying the error diffusion method to the initial placement pattern, the size of the virtual light scattering dots that make up the initial placement pattern can be set to multiple size levels.
  • the light scattering dot may have a diameter of 90 ⁇ m or less.
  • the size of the virtual region may be 0.2 mm to 2 mm.
  • the virtual cell arrangement interval may be 40 ⁇ m to 260 ⁇ m.
  • the number of the plurality of size levels may be 3 or more. In this case, three or more kinds of light scattering dots having different sizes are arranged in a state in which regularity is disturbed, so that the pattern unevenness is further hardly recognized.
  • a plurality of light is applied to a dot formation surface, which is at least one surface of a light guide plate base material, using a printing apparatus including a unit in which a plurality of printing parts for performing printing are arranged.
  • the present invention relates to a method of manufacturing a light guide plate in which scattering dots are formed. In this method, while the relative movement of the unit relative to the light guide plate substrate, the arrangement pattern design step of designing the arrangement pattern of a plurality of light scattering dots by the arrangement pattern design method according to one aspect of the present invention described above, And a light scattering dot printing step of printing light scattering dots on the light guide plate substrate according to the arrangement pattern by the printing portion of the unit.
  • a plurality of light scattering dots are formed using the inkjet printing method. Formed on the surface.
  • pattern unevenness of the plurality of light scattering dots is difficult to be visually recognized.
  • the printing part may be a nozzle capable of ejecting inkjet ink.
  • the light scattering dots may be formed by inkjet ink ejected from the nozzle.
  • Still another aspect of the present invention provides a process for manufacturing a light guide plate by the method for manufacturing a light guide plate according to the other aspect of the present invention, and a light source for supplying light to the end surface of the manufactured light guide plate.
  • a surface light source device incorporating a light guide plate in which pattern unevenness of a plurality of light scattering dots is hardly visible can be manufactured.
  • Still another aspect of the present invention provides a process for manufacturing a light guide plate by the method for manufacturing a light guide plate according to the other aspect of the present invention, and a light source for supplying light to the end surface of the manufactured light guide plate. And a step of disposing a transmissive image display unit for displaying an image so as to face the surface opposite to the dot forming surface of the light guide plate. Also related to the method.
  • a light scattering dot arrangement pattern design method a light guide plate manufacturing method, a surface light source device manufacturing method, and a transmissive image display device manufacturing method, in which light scattering dot pattern unevenness is unlikely to occur. obtain.
  • FIG. 1 is a schematic diagram illustrating a schematic configuration of an embodiment of a transmissive image display apparatus.
  • FIG. 2 is a plan view of the light guide plate when viewed from the dot forming surface side.
  • FIG. 3 is a flowchart illustrating an embodiment of a method for manufacturing a light guide plate.
  • FIG. 4 is a drawing for explaining the coverage rate setting step.
  • FIG. 5 is a diagram for explaining the virtual cell setting step.
  • FIG. 6 is a drawing for explaining the initial arrangement pattern creation step.
  • FIG. 7 is a diagram illustrating an application example of the error diffusion method in the case of discretizing the size of the virtual light scattering dots in the upper left virtual cell of FIG. FIG.
  • FIG. 8 is a diagram illustrating an application example of the error diffusion method in the case where integer rounding is performed on the virtual cell on the right side of the virtual cell on which integer rounding is performed in FIG.
  • FIG. 9 is a diagram illustrating an application example of the error diffusion method in the case where integer rounding is performed on a virtual cell further to the right of the virtual cell on which integer rounding is performed in FIG.
  • FIG. 10 is a drawing showing an example of a designed arrangement pattern for creating light scattering dots.
  • FIG. 11 is a schematic diagram showing a light guide plate manufacturing apparatus including a printing apparatus used for printing light scattering dots.
  • FIG. 12 is a view of the ink jet head as viewed from the ink ejection side.
  • FIG. 1 is a schematic diagram showing a schematic configuration of an embodiment of a transmissive image display apparatus.
  • the structure of the transmissive image display apparatus 10 is disassembled and shown.
  • the transmissive image display device 10 can be suitably used as a display device or a television device for various electronic devices such as mobile phones and notebook computers.
  • the transmissive image display device 10 shown in FIG. 1 mainly includes a transmissive image display unit 12 and a surface light source device 14 that outputs planar light to be supplied to the transmissive image display unit 12.
  • An optical member 16 may be disposed between the transmissive image display unit 12 and the surface light source device 14. Examples of the optical member include an optical sheet such as a reflective polarization separation sheet, a light diffusion sheet, a microlens sheet, a lenticular lens sheet, and a prism sheet, and the optical members may be used alone or in combination without departing from the gist of the present invention. Can be arranged.
  • the direction in which the transmissive image display unit 12 and the optical member 16 are arranged with respect to the surface light source device 14 is referred to as a Z-axis direction.
  • Two directions orthogonal to the Z-axis direction are referred to as an X-axis direction and a Y-axis direction.
  • the X-axis direction and the Y-axis direction are orthogonal to each other.
  • the transmissive image display unit 12 displays an image by being illuminated with planar light emitted from the surface light source device 14.
  • An example of the transmissive image display unit 12 is a liquid crystal display panel as a polarizing plate bonding body in which polarizing plates 20 and 22 are disposed on both surfaces of a liquid crystal cell 18.
  • the transmissive image display device 10 is a liquid crystal display device (or a liquid crystal television).
  • the liquid crystal cell 18 and the polarizing plates 20 and 22 may be a liquid crystal cell and a polarizing plate used in a transmissive image display device such as a conventional liquid crystal display device.
  • An example of the liquid crystal cell 18 is a thin film transistor (TFT) type liquid crystal cell.
  • TFT thin film transistor
  • liquid crystal cell 18 may include a STN (Super Twisted Nematic) type, a TN (Twisted Nematic) type, an IPS (In Plane Switching) type, a VA (Vertical Alignment) type liquid crystal cell, and the like.
  • STN Super Twisted Nematic
  • TN Transmission Nematic
  • IPS In Plane Switching
  • VA Very Alignment
  • the surface light source device 14 in FIG. 1 is an edge light type surface light source device that supplies light to the transmissive image display unit 12.
  • the surface light source device 14 includes a light guide plate 24 and a light source unit 26 disposed on the side of the light guide plate 24.
  • the light source unit 26 includes a plurality of point light sources 26a arranged in a line (in FIG. 1, arranged in the Y-axis direction).
  • An example of the point light source 26a is a light emitting diode.
  • the light source unit 26 reflects and guides the light from the light source unit 26 on the top and bottom of the light source unit 26 and, in some cases, on the side opposite to the light guide plate 24 side in order to efficiently enter the light into the light guide plate 24. You may provide the reflector as a reflection part for guide
  • the light source unit 26 having a plurality of point light sources 26a has been illustrated, but the light source unit 26 may be a linear light source such as a cold cathode tube (CCFL).
  • CCFL cold cathode tube
  • the surface light source device 14 may include a reflecting plate 28 located on the opposite side of the transmissive image display unit 12 with respect to the light guide plate 24.
  • the reflection plate 28 is for making the light emitted from the light guide plate 24 toward the reflection plate 28 enter the light guide plate 24 again.
  • the reflector 28 may be in the form of a sheet as shown in FIG.
  • the reflection plate 28 may be the bottom surface of the housing of the surface light source device 14 that houses the light guide plate 24.
  • the reflection surface of the reflection plate 28 may be a mirror reflection surface or a scattering reflection surface.
  • the light guide plate 24 is used for converting the light emitted from the light source unit 26 into planar light and emitting it to the transmissive image display unit 12.
  • Examples of the planar view shape of the light guide plate 24 include a substantially rectangular shape and a substantially square shape.
  • the light guide plate 24 includes a light guide plate base material 30 and a plurality of light scattering dots 32 provided on the light guide plate base material 30. In FIG. 1, the light scattering dots 32 are schematically shown, and the size and the number of the light scattering dots 32 do not necessarily match those of the other drawings.
  • the light guide plate 24 scatters (for example, reflects) the light that is incident from the light source unit 26 and propagates through the light guide plate base material 30 by total reflection by the light scattering dots 32, thereby causing the light source unit 26. Is converted into planar light and emitted.
  • the light guide plate substrate 30 intersects the dot formation surface 30a on which the plurality of light scattering dots 32 are formed, the emission surface 30b that functions as a surface that emits light in the light guide plate 24, and the dot formation surface 30a and the emission surface 30b. It has four end faces 30c, 30d, 30e, 30f (see FIG. 2).
  • the dot forming surface 30a can be substantially flat.
  • the dot forming surface 30a may be a surface subjected to a liquid repellent treatment.
  • the exit surface 30b is a surface opposite to the dot formation surface 30a.
  • the emission surface 30b faces the transmissive image display unit 12 (or the optical member 16).
  • the emission surface 30b may be a flat surface as in the present embodiment, but may have an uneven shape.
  • the end surface 30c and the end surface 30d are opposed to each other in the X-axis direction.
  • the end surface 30 c faces the light source unit 26. In this case, the end surface 30c is an incident surface on which light from the light source unit 26 is incident.
  • the end surface 30e and the end surface 30f are opposed to each other in the Y-axis direction.
  • the light guide plate base material 30 is mainly formed of a translucent material.
  • the translucent material is preferably a poly (meth) acrylic acid alkyl resin sheet, a polystyrene sheet or a polycarbonate resin sheet, and more preferably a polymethyl methacrylate resin sheet (PMMA resin sheet).
  • the light guide plate substrate 30 may contain diffusing particles.
  • the light guide plate base material 30 is made of a translucent resin
  • the light guide plate base material 30 is a translucent resin sheet.
  • the thickness of the light guide plate substrate 30 is usually 0.1 mm to 4 mm.
  • the design method according to an embodiment is suitable for designing a dot formation arrangement pattern of a so-called thin light guide plate in which the thickness of the light guide plate substrate 30 is 1 mm or less.
  • FIG. 2 is a plan view of the light guide plate as viewed from the dot forming surface side.
  • the example of the planar view shape of the light scattering dots 32 provided on the dot formation surface 30a is substantially circular. As shown in FIG. 2, the plurality of light scattering dots 32 are arranged on the dot forming surface 30a so as to be separated from each other.
  • the diameter of the light-scattering dots 32 is approximately 10 ⁇ m or more, usually 90 ⁇ m or less, preferably 80 ⁇ m or less, and more preferably 60 ⁇ m or less. It is preferable that the light scattering dots 32 are not connected to each other.
  • light scattering ink is used, for example, ultraviolet curable ink, water-based ink or solvent ink.
  • the light scattering dots 32 are formed by an ink jet method, a screen method, or the like.
  • the light scattering dots 32 may be formed by irradiating with a laser beam.
  • the plurality of light scattering dots 32 are formed in a predetermined arrangement pattern so that uniform planar light is emitted from the emission surface 30b.
  • the size of the light scattering dots 32 is small on the end face 30 c side close to the light source unit 26 (point light source 26 a), and increases as the distance from the light source unit 26 increases.
  • the plurality of light scattering dots 32 are arranged in an arrangement pattern designed by an arrangement pattern design method described later.
  • the arrangement pattern of the light scattering dots 32 shown in FIG. 2 is an example, and the arrangement pattern of the light scattering dots 32 is not limited to the pattern shown in FIG.
  • FIG. 3 is a flowchart illustrating an embodiment of a method for manufacturing a light guide plate.
  • the arrangement pattern design step S10 includes a coverage setting step S11, a virtual cell setting step S12, an initial arrangement pattern creation step S13, and a dot formation arrangement pattern creation step S14. Each step will be described.
  • FIG. 4 is a drawing for explaining the coverage rate setting step, and is a plan view of the dot formation surface 30a.
  • the dot formation surface 30a is schematically shown, and the shape and dimensional ratio of the dot formation surface 30a do not necessarily match those in the explanation and other figures. The same applies to other drawings.
  • the dot formation surface 30 a is divided into a plurality of virtual areas (hereinafter referred to as virtual areas) 34 and the coverage ratio is set in each virtual area 34.
  • the plurality of virtual regions 34 are two-dimensionally arranged and are arranged at equal intervals in the horizontal direction and the vertical direction in the drawing. The size of each virtual area 34 is the same.
  • the size of the virtual region 34 for example, the length of one side is usually about 0.2 mm to 2 mm, preferably about 0.5 to 1.5 mm, and preferably 0.5 mm to 1.0 mm for a thin light guide plate.
  • One side of the virtual area 34 is set to an integral multiple of the size of a virtual cell to be described later.
  • An example of the shape of the virtual region 34 is a quadrangle such as a rectangle and a square.
  • the coverage is the ratio of the area occupied by the light scattering dots in the virtual region 34 to the area of the virtual region 34.
  • FIG. 4 shows the coverage ratio normalized based on the coverage ratio of the virtual area 34 in the lower right where the dot area is the maximum in the screen (1 in FIG. 4).
  • the coverage is appropriately designed by performing an optical simulation or actually making a prototype so that the in-plane luminance distribution of the surface light source device satisfies the specifications of predetermined luminance and uniformity.
  • FIG. 5 is a drawing for explaining the virtual cell setting step.
  • each virtual area 34 is further divided into a plurality of virtual cells (hereinafter referred to as virtual cells) 36.
  • virtual cells hereinafter referred to as virtual cells
  • the plurality of virtual cells 36 have the same size and shape.
  • the first virtual lines L1 arranged in parallel with the first direction (vertical direction in the figure) and at equal intervals, and the second direction (horizontal direction in the figure) orthogonal to the first direction. Is surrounded by the adjacent first virtual lines L1, L1 and the adjacent second virtual lines L2, L2.
  • the area is a virtual cell 36.
  • a set of a plurality of virtual cells 36 is a virtual region 34. As shown in FIG. 5, the virtual cells 36 are arranged at equal intervals in the first direction, and are also arranged at equal intervals in the second direction.
  • the arrangement interval (size of one side) of the virtual cells 36 is usually 40 ⁇ m to 260 ⁇ m, and is preferably 170 ⁇ m or less, more preferably 100 ⁇ m or less in a thin light guide plate.
  • each virtual cell 36 indicates the coverage in each virtual cell 36.
  • the coverage of the virtual cells 36 in one virtual region 34 is the same.
  • FIG. 6 is a drawing for explaining the initial arrangement pattern creation step.
  • virtual light scattering dots hereinafter referred to as virtual light scattering dots
  • the size of the virtual light scattering dots arranged in each virtual cell 36 is in accordance with the coverage of the corresponding virtual cell 36 and is arbitrary (including size 0).
  • virtual light scattering dots having a finite size are arranged in virtual cells 36 in which numbers greater than 0 are described. That is, in FIG. 6, virtual light scattering dots are arranged in all virtual cells 36.
  • the virtual light scattering dot is arranged at the same position with respect to each of the plurality of virtual cells 36, for example, at the center of the virtual cell 36.
  • the virtual cells 36 are arranged at equal intervals in the first direction and are arranged at equal intervals in the second direction. Therefore, in the initial arrangement pattern, the virtual light scattering dots are regularly arranged at a constant interval (pitch).
  • the maximum value of the size of the virtual light scattering dot is “4”, that is, the size of the virtual light scattering dot arranged in the virtual cell 36 having the maximum coverage is “4”.
  • the relative virtual light scattering dot size in the case is shown.
  • the maximum value of the size of the virtual light scattering dots is assumed to be “4” because the size of the light scattering dots 32 to be formed is “0”, “1”, “2” as will be described later. This is because it is discretized into five levels such as “,” “3” and “4”.
  • the size of the virtual light scattering dots 32 is digitally expressed as an integer.
  • the size of the light scattering dots 32 can be represented by the number of inks to be dropped.
  • the size of the light scattering dot 32 is discretely expressed as an integer such as “0”, “1”, “2”, “3”, “4” at the design stage, “0”, “1”, “2”, “3”, “4” indicating the size are 0 times, 1, 2, 3, 4 times, respectively.
  • the numerical value indicating the size of the light scattering dot 32 at the design stage and the number of ink drops may not be the same as long as the correspondence between the size and the number of drops is maintained.
  • the error diffusion method is one of dithering methods.
  • an error caused by discretization is diffused to surrounding virtual cells 36 according to a predetermined weight.
  • FIG. 7 is a diagram showing an application example of the error diffusion method in the case of discretizing the size of the virtual light scattering dots in the upper left virtual cell 36 of FIG.
  • FIG. 7A is an excerpt of the area A indicated by hatching in FIG.
  • the “integer rounding” of the numerical value in the virtual cell 36 indicated by a thick frame is performed. Integer rounding is usually done by rounding off.
  • FIG. 7 (b) shows the result of integer rounding by rounding off 0.36, which is the numerical value indicating the size of the virtual light scattering dot in the upper left virtual cell 36. Since the numerical value in the virtual cell 36 for performing integer rounding is 0.36, the rounded result is 0.
  • FIG. 7 (c) is a diagram showing weights for distributing an error generated when integer rounding is performed to the surroundings.
  • the weights shown in FIG. 7C are weights based on the Floyd-Steinberg error matrix.
  • a thick frame cell S0 marked with “*” as a mark corresponds to the virtual cell 36 that has been subjected to integer rounding.
  • the error generated by the integer rounding in the size of the virtual light scattering dot in each of the virtual cells 36 on the right, lower left, lower and lower right of the virtual cell 36 subjected to integer rounding is shown in FIG. Distribute according to the weights described in the corresponding cells S1, S2, S3, S4 of the matrix shown in c).
  • FIG. 7D shows a distribution value as a result of weighting the error.
  • the error to be distributed is 0.36
  • distribution values obtained by calculating in the same way are also described for the cells S2 to S4 in the lower left, lower, and lower right of the cells marked with “*” in FIG. 7 (c). Yes.
  • FIG. 7 (e) is a drawing showing the result after error distribution. Specifically, this is a result of performing an operation of adding the value of the corresponding cell in FIG. 7D to the value in the virtual cell 36 around the virtual cell 36 in which integer rounding is performed in FIG. 7B.
  • a virtual cell 36 indicated by hatching is a virtual cell 36 to which an error is distributed.
  • FIG. 8 is a diagram showing an application example of the error diffusion method when integer rounding is performed on the virtual cell on the right side of the virtual cell on which integer rounding is performed in FIG.
  • FIG. 8A integer rounding is performed on the virtual cell 36 indicated by a thick frame. Since the numerical value in the thick frame in FIG. 8A is 0.518, when rounding is performed and integer rounding is performed, the result of integer rounding is 1 as shown in FIG. 8B.
  • FIG. 8 (e) is a drawing showing the result after error distribution. Specifically, in FIG. 8E, the value of the corresponding cell in FIG. 8D is replaced with the value in the virtual cell 36 around the virtual cell 36 in which integer rounding is performed in FIG. 8B. The result of performing the addition operation is shown. A virtual cell 36 indicated by hatching is a virtual cell 36 to which an error is distributed.
  • FIG. 9 is a diagram illustrating an application example of the error diffusion method in the case where integer rounding is performed on the virtual cell on the right side of the virtual cell on which integer rounding is performed in FIG.
  • integer rounding is performed on the virtual cell 36 indicated by the thick frame shown in FIG. Since the numerical value in the thick frame in FIG. 9A is 0.149, when rounding is performed to round integers, the result of integer rounding is 0 as shown in FIG. 9B.
  • FIG. 9 (e) is a drawing showing the result after error distribution. Specifically, in FIG. 9E, the value of the corresponding cell in FIG. 9D is set to the value in the virtual cell 36 around the virtual cell 36 in which integer rounding is performed in FIG. 9B. The result of performing the addition operation is shown. A virtual cell 36 indicated by hatching is a virtual cell 36 to which an error is distributed.
  • light scattering dots 32 are then formed on the dot forming surface 30a of the light guide plate substrate 30 in accordance with the designed dot formation arrangement pattern. Thereby, the light guide plate 24 can be manufactured.
  • the light guide plate substrate 30 can be manufactured by, for example, an extrusion molding method. Specifically, a thermoplastic resin as an example of the raw material of the light guide plate base material 30 is extruded.
  • the light guide plate base material 30 is obtained by forming a plate having a predetermined thickness by this extrusion molding.
  • the light scattering dots 32 can be formed using an inkjet method.
  • FIG. 11 is a schematic diagram showing an apparatus for manufacturing the light guide plate 24 including the printing device used in the light scattering dot printing step S20.
  • the manufacturing apparatus 38 includes a conveyance unit 40 that conveys the light guide plate substrate 30, an inkjet head unit 42, a UV lamp 44, and an inspection device 46.
  • the inkjet head unit 42, the UV lamp 44, and the inspection device 46 are arranged in this order from the upstream side in the conveyance direction U of the light guide plate substrate 30.
  • the ink jet head unit 42 and the UV lamp 44 correspond to a printing device for the light scattering dots 32.
  • the light guide plate substrate 30 is transported continuously or intermittently along the transport direction U by the transport unit 40.
  • the light guide plate substrate 30 may be cut in advance according to the size of the target light guide plate 24.
  • the light scattering dots 32 may be formed on the light guide plate substrate 30 having a size larger than the size of the target light guide plate 24, and then the light guide plate substrate 30 may be cut to fit the target size. . In this case, it may be cut so as to obtain one light guide plate from a large-sized light guide plate base material, or may be cut so as to obtain a plurality of light guide plates.
  • the transport unit 40 in the present embodiment is a table shuttle, but the transport unit is not limited to this.
  • the conveyance unit 40 may be, for example, a belt conveyor, a roller, or air floating transfer.
  • An arrangement pattern for forming light-scattering dots in which droplet-like inkjet ink is designed on the dot formation surface 30a of the light guide plate substrate 30 by the inkjet head unit 42 supported by the support unit 48 in the arrangement pattern design step S10.
  • Pattern printing is performed in a dot shape with (dot forming arrangement pattern).
  • the number of times the ink is dropped at one position is adjusted according to the size of the light scattering dots 32 shown in the arrangement pattern. That is, in the numerical values in the virtual cell 36 shown in FIG. 10, “0”, “1”, “2”, “3”, “4” are 0 drop, 1 drop, 2 drops, 3 drops, and It means dropping 4 drops of ink.
  • the inkjet head unit 42 forms dots on the light guide plate substrate 30 over the entire width direction (direction perpendicular to the direction U) of the region where the light scattering dots 32 are formed on the dot formation surface 30a of the light guide plate substrate 30.
  • a plurality of nozzles 50 in one row or two or more rows are arranged and fixed so as to face the surface 30a.
  • Droplet-like ink ejected from a predetermined nozzle 50 by the inkjet method among the plurality of nozzles 50 is simultaneously printed all over the entire width direction of the light guide plate substrate 30.
  • the ink is printed while continuously moving the light guide plate substrate 30 at a constant speed.
  • printing is performed in a state where the light guide plate base material 30 is stopped, and the light guide plate base material 30 is moved to the next printing position and then stopped, and is configured from a plurality of rows of dots. Ink can also be efficiently printed with a pattern.
  • the inkjet head unit 42 includes a plurality of inkjet heads (units) 42 a to 42 c each having a plurality of nozzles 50.
  • FIG. 12 is an ink jet drawing when the ink jet head is viewed from the ink ejection side.
  • FIG. 12 illustrates the inkjet head 42a, the same applies to the inkjet heads 42b and 42c.
  • the plurality of inkjet heads 42a to 42c are arranged, for example, in a direction orthogonal to the transport direction U, and are connected via a fixing member 52 (see FIG. 6) so that their ends overlap in the transport direction U. .
  • the nozzle 50 of the inkjet head unit 42 is connected to an ink supply unit 56 through a conduit 54.
  • the ink supply unit 56 includes, for example, an ink tank in which ink is stored and a pump for sending out ink.
  • a plurality of conduits 54 may be connected to a single ink tank, or may be connected to a plurality of ink tanks.
  • the ink-jet ink used in the ink-jet printing method to form the light scattering dots 32 is, for example, an ultraviolet curable ink containing a pigment, a photopolymerizable component, and a photopolymerization initiator.
  • the inkjet ink does not necessarily contain a pigment.
  • the printed ink is photocured in the region 60 by the UV lamp 44 supported by the support portion 58.
  • light scattering dots 32 made of cured ink are formed. That is, the light scattering dots 32 are printed on the dot formation surface 30a.
  • the light guide plate 24 is obtained through a process of inspecting the state of the formed light scattering dots 32 by the inspection device 46 supported by the support portion 62.
  • the light guide plate 24 does not necessarily have to be continuously inspected by the inspection device 46 provided on the downstream side of the inkjet head unit 42, and the light guide plate is inspected offline by a separately prepared inspection device. You can also Alternatively, the inspection of the light guide plate 24 by the inspection device may be omitted.
  • the ink has been described as an ultraviolet curable ink, but the ink may be a water-based ink, a solvent-based ink, or the like. In this case, instead of the UV lamp 44, light scattering dots are formed by drying water or a solvent with an appropriate drying facility.
  • the light source unit 26 may be disposed on the side of the end surface 30c of the light guide plate 24 as shown in FIG. . What is necessary is just to fix the light-guide plate 24 and the light source part 26 suitably to the housing
  • the transmissive image display device 10 when the transmissive image display device 10 is manufactured based on the light guide plate 24 manufactured by the above method, the light source unit 26 is provided on the side of the end face 30c of the light guide plate 24 as shown in FIG.
  • the transmissive image display unit 12 may be arranged on the light exit surface 30 b side of the light guide plate 24.
  • the optical member 16 may be disposed between the transmissive image display unit 12 and the light guide plate 24 as necessary.
  • the light guide plate 24, the light source unit 26, and the transmissive image display unit 12 may be appropriately fixed to a housing that accommodates them.
  • the arrangement of the light scattering dots is difficult to be visually recognized as pattern unevenness. This point will be described in comparison with the case where the error diffusion method is not used.
  • the light scattering dots are likely to be periodically arranged. Is easily visible.
  • information devices such as notebook personal computers tend to be thinned in recent years.
  • the light guide plate and the optical member incorporated in the image display device together with the light guide plate are becoming thinner.
  • the pattern unevenness is easily visible from the exit surface side.
  • a method of intentionally changing the pitch of the adjacent light scattering dots is also conceivable. For example, when forming the light scattering dots by the ink jet printing method, the nozzle pitch is changed. It is not easy.
  • the error diffusion method is applied to the initial arrangement pattern to discretize the size of the virtual light scattering dots.
  • This discretization disturbs the regular arrangement of virtual light scattering dots.
  • the above-described pattern unevenness is difficult to be visually recognized.
  • the arrangement pattern of the light guide plate 24 can be designed rather than finding an optimum pattern by trial and error based on experience and the like. The required time can be shortened.
  • the print target position is the same pitch, but the arrangement pattern of the light scattering dots 32 is realized by the number of ink drops to the print target position. There is no need to adjust the nozzle position. As a result, even if the ink jet printing method is used, the light scattering dots 32 can be easily formed, and high productivity can be ensured.
  • a PMMA resin sheet of 298 mm ⁇ 173 mm was prepared as the light guide plate base material 30, and a light guide plate 24 was manufactured using an ultraviolet curable inkjet ink containing calcium carbonate as a pigment.
  • the arrangement pattern of the light scattering dots 32 was designed according to the arrangement pattern design step S10 shown in FIG.
  • the dot formation surface 30a is divided into a plurality of square virtual regions 34 each having a side of 0.507 mm, and the luminance of the planar light from the exit surface 30b is uniform.
  • the coverage was set so that In the virtual cell setting step S ⁇ b> 12, 6 ⁇ 6 virtual cells 36 are set in each virtual region 34.
  • a plurality of virtual cells 36 are two-dimensionally and regularly arranged as shown in FIG.
  • the dot formation arrangement pattern was created by applying the error diffusion method to the initial arrangement pattern.
  • the masking film was peeled off from the PMMA resin sheet prepared as the light guide plate substrate 30.
  • a surface of the PMMA resin sheet from which the masking film was peeled was defined as a dot formation surface 30a.
  • the light guide plate 24 was obtained by forming the light scattering dots 32 on the dot formation surface 30a based on the created arrangement pattern (dot formation arrangement pattern).
  • the light scattering dots 32 were formed using an ink jet printing method. At that time, an inkjet head having a nozzle-to-nozzle distance of about 84.5 ⁇ m was used. The ink was cured by irradiating with ultraviolet rays.
  • the virtual light scattering dots are arranged in all the set virtual cells 36.
  • the virtual light scattering dots may be alternately arranged with respect to the adjacent virtual cells 36, that is, staggered.
  • Virtual light scattering dots may be arranged in a lattice shape. In the arrangement pattern of the light scattering dots 32 shown in FIGS.
  • the size level is set to five levels of 0, 1, 2, 3, and 4, but the size level should be 2 or more. What is necessary is just 3 or more. If the size level is 3 or more, it is easy to design an arrangement pattern in which pattern unevenness is less visible even if the coverage set for each virtual region 34 is set with a finer gradation. The quality of the luminance distribution of the light source device 14 can be improved.
  • SYMBOLS 10 Transmission type image display apparatus, 12 ... Transmission type image display part, 14 ... Surface light source device, 24 ... Light guide plate, 26 ... Light source part, 30 ... Light guide plate base material, 30a ... Dot formation surface, 30b ... Output surface, 32: Light scattering dots, 34: Virtual region, 36: Virtual cell.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Liquid Crystal (AREA)
PCT/JP2014/063494 2013-05-31 2014-05-21 配置パターンの設計方法、導光板の製造方法、面光源装置の製造方法及び透過型画像表示装置の製造方法 WO2014192618A1 (ja)

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KR1020157037159A KR20160016952A (ko) 2013-05-31 2014-05-21 배치 패턴의 설계 방법, 도광판의 제조 방법, 면광원 장치의 제조 방법 및 투과형 화상 표시 장치의 제조 방법
CN201480030329.0A CN105247270A (zh) 2013-05-31 2014-05-21 配置图案的设计方法、导光板的制造方法、面光源装置的制造方法以及透射式图像显示装置的制造方法

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JP2003066208A (ja) * 2001-04-19 2003-03-05 Internatl Business Mach Corp <Ibm> 離散パターン、該離散パターンを用いた光学部材、導光板、サイドライト装置、透過型液晶表示装置、該離散パターンの生成方法および該離散パターンを生成するためのプログラム、該離散パターンを生成するためのコンピュータ可読なプログラムが記録されたコンピュータ可読な記録媒体並びに離散パターン生成システム
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JP2012151100A (ja) * 2010-12-28 2012-08-09 Sumitomo Chemical Co Ltd 導光板、面光源装置、及び、透過型画像表示装置
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JP2014235831A (ja) 2014-12-15
TW201502610A (zh) 2015-01-16

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