WO2011065309A1 - 光拡散偏光シート、光拡散偏光シートの製造方法、及び表示装置 - Google Patents
光拡散偏光シート、光拡散偏光シートの製造方法、及び表示装置 Download PDFInfo
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- WO2011065309A1 WO2011065309A1 PCT/JP2010/070710 JP2010070710W WO2011065309A1 WO 2011065309 A1 WO2011065309 A1 WO 2011065309A1 JP 2010070710 W JP2010070710 W JP 2010070710W WO 2011065309 A1 WO2011065309 A1 WO 2011065309A1
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- layer
- light
- polarizing
- light diffusing
- light diffusion
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- G02B1/105—
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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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
- G02B5/021—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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
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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
- G02F1/133528—Polarisers
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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
- G02F1/133504—Diffusing, scattering, diffracting elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
Definitions
- the present invention relates to a light diffusing polarizing sheet, a manufacturing method thereof, and a display device including the light diffusing polarizing sheet.
- the polarizing plate used in the liquid crystal display device is composed of a polarizing layer sandwiched between two protective layers.
- Patent Document 1 describes a retardation film integrated polarizing plate in which a TAC film is used as a protective layer and two TAC films are bonded to both surfaces of a polarizing layer via an adhesive layer. A similar polarizing plate is also described in Patent Document 2.
- a light diffusion sheet has been used in order to widen the viewing angle of a liquid crystal display device and enhance the visibility of an observer.
- the light diffusing sheet is used by being bonded onto a polarizing plate of a liquid crystal display device, and realizes a viewing angle free by refracting light from the liquid crystal display device in multiple directions using a difference in refractive index.
- Patent Document 3 discloses that light diffusion is realized in a groove having a V-shaped cross section provided in the light diffusion layer, and stray light is absorbed in the light absorption layer provided so as to close the groove.
- stray light is absorbed in the light absorption layer provided so as to close the groove.
- Similar light diffusion sheets are also described in Patent Documents 3 to 7.
- the present invention has been made in view of the above problems, and its purpose is to suppress the occurrence of image blurring and to be easily manufactured, a method for manufacturing the light diffusion polarizing sheet, and It is providing the display apparatus provided with the said light-diffusion polarizing sheet.
- a light diffusion polarizing sheet includes a polarizer including a polarizing layer having a first protective layer attached via a first adhesive layer, and an incident from the polarizer side. And a light diffusing portion for diffusing the light transmitted in the thickness direction, and a light diffusing layer provided on a surface facing the first protective layer of the polarizing layer. .
- the distance from the liquid crystal cell to the light diffusing portion is significantly shorter than that of the conventional polarizing plate and the light diffusing sheet, and the diagonal double due to the distance from the liquid crystal cell to the light diffusing portion. It is possible to suppress a decrease in visibility due to the occurrence of image blur such as an image. Further, since the number of members and man-hours are reduced, throughput and yield are improved, and cost reduction can be realized.
- the method for producing a light diffusing polarizing sheet according to the present invention includes a polarizer including a polarizing layer having a first protective layer attached thereto via a first adhesive layer, the back of the polarizing layer facing the first protective layer.
- the distance from the liquid crystal cell to the light diffusing portion is reduced by the conventional polarizing plate and the light diffusing sheet.
- Manufacturing a light diffusing polarizing sheet that is significantly shorter than those provided with the above and suppresses a decrease in visibility due to image blurring such as an oblique double image caused by the distance from the liquid crystal cell to the light diffusing portion. be able to. Further, since the number of members and man-hours are reduced, throughput and yield are improved, and cost reduction can be realized.
- a display device includes a liquid crystal panel including any one of the light diffusing polarizing sheets and a liquid crystal cell layer attached to the light diffusing polarizing sheet.
- the distance from the liquid crystal cell to the light diffusing portion is significantly shorter than that of the conventional polarizing plate and the light diffusing layer, and the diagonal double due to the distance from the liquid crystal cell to the light diffusing portion. It is possible to realize a liquid crystal panel in which deterioration in visibility due to occurrence of image blur such as an image is suppressed. Further, since the number of members and man-hours are reduced, throughput and yield are improved, and cost reduction can be realized.
- the light diffusing polarizing sheet according to the present invention includes a polarizing layer to which a first protective layer is attached via a first adhesive layer, and a light diffusing portion for diffusing light from the polarizing layer side. And a light diffusing layer provided on the surface opposite to the surface on which the first protective layer is attached, so that the image blur due to the oblique double image is achieved by shortening the distance from the liquid crystal cell to the light diffusing portion. It is possible to manufacture easily by suppressing the occurrence of this and reducing the number of members and man-hours.
- (A) And (b) is a schematic diagram explaining the optical path of light from a liquid crystal cell. It is sectional drawing which shows other embodiment of the light-diffusion polarizing sheet which concerns on this invention. It is sectional drawing which shows other embodiment of the light-diffusion polarizing sheet which concerns on this invention. It is sectional drawing which shows other embodiment of the light-diffusion polarizing sheet which concerns on this invention. It is sectional drawing which shows other embodiment of the light-diffusion polarizing sheet which concerns on this invention. It is sectional drawing which shows other embodiment of the light-diffusion polarizing sheet which concerns on this invention.
- FIG. 1 is a cross-sectional view showing a light diffusing polarizing sheet 1 according to an embodiment of the present invention
- FIGS. 2A and 2B are schematic views for explaining an optical path of light from a liquid crystal cell.
- the light diffusion polarizing sheet 1 includes a polarizer 2 and a light diffusion layer 3.
- the polarizer 2 includes a polarizing layer 4 and a first protective layer 6 attached to the polarizing layer 4 via an adhesive layer (first adhesive layer) 5.
- the light diffusion layer 3 is directly provided on the surface facing the first protective layer 6 of the polarizing layer 4 (the surface on the side where the first protective layer 6 of the polarizing layer 4 is not provided). .
- the surface of the first protective layer 6 facing away from the polarizing layer 4 (the surface on the side where the polarizing layer 4 is not provided) is connected to the liquid crystal cell (liquid crystal cell layer) 8 via the adhesive layer 7.
- the liquid crystal panel 10 is configured by being attached to.
- each layer which comprises the light-diffusion polarizing sheet 1 and the liquid crystal panel 10 is translucent.
- the polarizer 2 is formed by attaching the first protective layer 6 to the polarizing layer 4 via the adhesive layer 5.
- the polarizing layer 4 controls the passage of light from the display device by imparting a bias to the vibration direction of the light, and a conventionally known polarizing material can be used.
- the polarizing layer 4 can be formed using either an organic polarizing material or an inorganic polarizing material, and adsorbs dichroic molecules such as higher-order iodine ions as the organic polarizing material. And polyvinyl alcohol (PVA).
- the first protective layer 6 may be any layer that can protect the polarizing layer 4, and a known protective layer can be used.
- a known protective layer can be used.
- TAC triacetyl cellulose
- COP cyclic olefin polymer
- PC Polycarbonate
- the layer thickness of the first protective layer 6 is preferably 30 to 100 ⁇ m, and more preferably 30 to 50 ⁇ m from the viewpoint of thinning.
- the polarizer 2 can be manufactured by a conventionally known method.
- PVA adsorbed with iodine as the polarizing layer 4, for example, as described in Patent Document 2, after forming the polarizing layer 4 by adsorbing iodine to a stretched polyvinyl alcohol film, the adhesive layer 5 It can manufacture by sticking the 1st protective layer 6 to the polarizing layer 4 via.
- the light diffusion layer 3 includes a light diffusion portion that diffuses light from the polarizer 2. That is, in the present embodiment, the light diffusion layer 3 is a light diffusion portion.
- the light diffusion layer 3 extends the viewing angle of the display device by refracting and diffusing the light incident from the polarizer 2 side and transmitting in the thickness direction and emitting it to the outside of the light diffusion polarizing sheet 1. It is.
- the layer thickness of the light diffusion layer 3 is preferably 1 to 100 ⁇ m, and more preferably 1 to 5 ⁇ m from the viewpoint of thinning.
- a light diffusing layer 3 for example, a plurality of concave portions recessed from the observation surface (a surface facing the polarizing layer 4, a light emitting surface) of the high refractive index material layer formed of a high refractive material toward the polarizing layer 4 side. Can be used.
- This recess has a cross-sectional shape when the high refractive index material layer is cut in the thickness direction (a cross-sectional shape when cut by a surface penetrating the surface facing the polarizing layer 4 and the surface facing the polarizing layer). You may provide so that the surface side (light incident surface side) which opposes the layer 4 may become a substantially V shape which tapered.
- the shape of the recess is not particularly limited, and the groove may be formed in a line shape.
- a conical recess may be formed in a dot shape.
- the arrangement method of the plurality of recesses is not particularly limited, and may be arranged substantially in parallel or randomly as long as they are provided in the one-dimensional direction and the two-dimensional direction on the observation surface. .
- the light diffusion layer 3 manufactured in this way When the light diffusion layer 3 manufactured in this way is used, the light incident on the concave portion from the polarizer 2 side is totally reflected or transmitted at the interface, and the totally reflected light is emitted to the outside. Therefore, a wide viewing angle can be realized.
- the structure of the light-diffusion layer 3 is not limited to this, It can also comprise similarly to each embodiment mentioned later.
- the light diffusion layer 3 may be configured such that the refractive index is lower in the recess than in the light diffusion layer 3 other than the recess.
- the high refractive index material for forming the light diffusion layer 3 conventionally known materials as described in Patent Documents 3 to 7 can be used. Further, as the high refractive index material, a highly moisture permeable material used as the first protective layer 6 of the polarizer 2 may be used, and examples thereof include TAC, COP, and PC. As a result, it is possible to realize the light diffusion layer 3 that efficiently discharges moisture generated when the polarizing layer 4 is formed and functions as a protective layer for the polarizing layer 4 while maintaining the light diffusion function.
- the polarizing layer 4 can be sufficiently protected. However, it is possible to realize the light diffusion polarizing sheet 1 that maintains the function as the light diffusion layer 3 and reduces the occurrence of curling and cracking.
- the light diffusing polarizing sheet 1 can be manufactured as follows, for example.
- the polarizer 2 is formed by attaching the first protective layer 6 to the polarizing layer 4 via the adhesive layer 5.
- a high refractive index material layer is formed on the surface of the polarizer 2 facing away from the first protective layer 6 (the surface where the first protective layer 6 is not attached).
- the light-diffusion layer 3 is formed by forming a recessed part with a V-shaped cross section in a high refractive index material layer (light-diffusion layer formation process).
- the light diffusing polarizing sheet 1 is formed by forming the light diffusing layer 3 directly on the polarizing layer 4 based on the polarizing layer 4 of the polarizer 2, thereby integrating the polarizer 2 and the light diffusing layer 3. It is a thing. Therefore, it is not necessary to provide protective layers on both sides of the polarizing layer, which is necessary for a conventional polarizing plate, and the light diffusion layer 3 plays the role of one protective layer. Moreover, it is not necessary to form a light diffusion sheet based on the base film required for the conventional light diffusion sheet, and the polarizer 2 plays the role.
- the distance from the liquid crystal cell 8 to the light diffusing portion is reduced by reducing one protective layer of the polarizing layer 4, the base film, and the adhesive layer that bonds the protective layer. And much shorter than those provided with a light diffusion sheet. Therefore, it is possible to suppress a reduction in visibility due to the occurrence of image blur such as an oblique double image due to the distance from the liquid crystal cell 8 to the light diffusion portion.
- the distance L from the pixel of the liquid crystal display 23a to the surface of the light diffusion layer 21a is longer due to the thickness of the polarizer and the base film 22a of the light diffusion layer.
- the distance L from the pixel of the liquid crystal display 23b to the surface of the light diffusion layer 21b is shorter due to the thickness of the polarizer and the base film 22b of the light diffusion layer.
- the double image width W of the oblique viewing angle visually recognized by the visual recognition parts 24a and 24b is proportional to the distance L. That is, the larger the width W, the more clearly the blur of the double image is visually recognized.
- the light passing through the optical path r reaches the light diffusion layers 21a and 21b, and is totally reflected and output by the concave portion having a substantially V-shaped cross section ( Total reflection light).
- the light passing through the optical path d reaches the light diffusion layers 21a and 21b and is output as it is (directly passing light).
- the emission angles ⁇ r-out and ⁇ d-out of light emitted from the same pixel and passing through the optical path r or d are constant regardless of the distance L.
- the distance D between the optical path r and the optical path d in the light diffusion layers 21a and 21b and the width W between the emitted total reflected light and the direct light are longer as the distance L is longer and shorter as the distance L is shorter.
- the width W is shorter, double blurring is less likely to be recognized in the visual recognition parts 24a and 24b. Therefore, the viewing angle characteristic is improved as the width W is shorter. For example, if W is 250 ⁇ m or less, double blur is a level that is hardly recognized, and if it is 150 ⁇ m or less, it is a level that cannot be completely distinguished.
- one protective layer usually 50 to 80 ⁇ m
- a base film usually 100 ⁇ m
- an adhesive layer thereof usually, the distance L is as short as 160 to 190 ⁇ m.
- the conventional polarizing plate and the light diffusing sheet each have a multi-layer structure, and the number of members is large, so the number of man-hours is increased, and the throughput and yield are poor. Since the light diffusion polarizing sheet 1 is reduced in one protective layer, base film, and adhesive layers thereof, the number of members and man-hours are reduced, so that the throughput and yield are improved, and the cost can be reduced.
- FIG. 3 is a cross-sectional view showing a light diffusion polarizing sheet 31 according to another embodiment of the present invention.
- the light diffusing polarizing sheet 31 includes an adhesive layer (second adhesive layer) 33 and a second protective layer 34 between the light diffusing layer 3 that is a light diffusing portion and the polarizing layer 4.
- second adhesive layer an adhesive layer
- second protective layer 34 between the light diffusing layer 3 that is a light diffusing portion and the polarizing layer 4.
- the inside of the recess provided on the observation surface of the light diffusion layer 3 (the surface facing away from the polarizer 32) has a lower refractive index than that of the light diffusion layer 3 other than the recess, and a higher refractive index than air.
- the point which is filled with the translucent material is also different from the other embodiments. In the present embodiment, only differences from the first embodiment will be described, and other details will be omitted.
- the light diffusing polarizing sheet 31 includes a second protective layer on the surface facing the first protective layer 6 in the polarizing layer 4 to which the first protective layer 6 is attached via the adhesive layer 5 via the adhesive layer 33. And a light diffusion layer 3 provided on the second protective layer 34 of the polarizer 32. Then, the surface of the polarizer 32 facing the polarizing layer 4 of the first protective layer 6 is attached to the liquid crystal cell 8 via the adhesive layer 7 to constitute the liquid crystal panel 30.
- the second protective layer 34 can be configured in the same manner as the first protective layer 6, and the adhesive layer 33 can be configured in the same manner as the adhesive layer 5.
- the polarizer 32 is formed by forming the second protective layer 34 on the surface facing the first protective layer 6 of the polarizing layer 4 via the adhesive layer 33 (second protective layer forming step).
- the polarizer 32 has a configuration in which both surfaces of the polarizing layer 4 are sandwiched between two protective layers (first protective layer 6 and second protective layer 34), and has the same configuration as a conventional polarizing plate. Therefore, the light diffusion polarizing sheet 31 may use a commercially available conventional polarizing plate as the polarizer 32, and the development cost can be suppressed.
- the light diffusion polarizing sheet 31 since the light diffusion layer 3 is formed directly on the second protective layer 34 of the polarizer 32, the base film is compared with the case where the conventional polarizing plate and the light diffusion sheet are used. Can be reduced. Therefore, the distance from the liquid crystal cell 8 to the light diffusing portion is shortened by the thickness of the base film, the occurrence of image blur such as an oblique double image is suppressed, and the visibility is improved. In addition, the light diffusing polarizing sheet 31 can be manufactured at a low cost with a small number of members.
- the concave portion of the light diffusion layer 3 is filled with a translucent material having a refractive index lower than that of the portion other than the concave portion of the light diffusion layer 3 and higher than that of air. Therefore, the light incident on the concave portion from the polarizer 2 side due to the difference in refractive index between the inside and outside of the concave portion is totally reflected at the interface, passes through the light diffusion portion, and is emitted to the outside. Therefore, a wide viewing angle can be realized.
- a translucent material conventionally known materials can be suitably used. Note that the light diffusion layer 3 according to the present embodiment can be configured in the same manner as in the other embodiments.
- FIG. 4 is a cross-sectional view showing a light diffusion polarizing sheet 41 according to another embodiment of the present invention.
- the light diffusion layer 43 includes a base film (base portion) 43b between the light diffusion portion 43a and the polarization layer 4, and the base film 43b includes the adhesive layer 44. It is different from the other embodiments in that it is affixed to the polarizing layer 4 via.
- the inside of the recess provided on the observation surface of the light diffusion portion 43a of the light diffusion layer 43 (the surface facing away from the polarizer 32) has a lower refractive index than the portion other than the recess of the light diffusion layer portion 43a. It is also different from the other embodiments in that it is filled with a light-shielding material having a higher refractive index. In the present embodiment, only differences from the other embodiments will be described, and other details will be omitted.
- the light diffusion polarizing sheet 41 is a polarizer 42 in which an adhesive layer 44 is provided on the surface facing the first protective layer 6 in the polarizing layer 4 to which the first protective layer 6 is attached via the adhesive layer 5. And a light diffusing portion 43 a and a base film 43 b, and a light diffusing layer 43 in which the base film 43 b is attached to the polarizer 42 through an adhesive layer 44. Then, the surface of the polarizer 42 facing away from the polarizing layer 4 of the first protective layer 6 is attached to the liquid crystal cell 8 via the adhesive layer 7 to constitute the liquid crystal panel 40.
- the base film 43b As the base film 43b, conventionally known ones as described in Patent Documents 3 to 7 can be used.
- the base film 43b supports the light diffusion part 43a.
- the adhesive layer 44 can be configured similarly to the adhesive layer 5.
- the light diffusing portion 43a is provided with the above-described high refractive index material layer on the base film 43b to form a recess, and the light shielding portion has a lower refractive index than the portion other than the recess in the recess and has a higher refractive index than air. It can be formed by filling a functional material.
- the light diffusion layer 43 In the light diffusion polarizing sheet 41, the light diffusion layer 43 is constituted by the light diffusion portion 43a and the base film 43b.
- the 1st protective layer 6 is first affixed on the one surface of the polarizing layer 4 via the contact bonding layer 5, and it faces back to a 1st protective layer.
- the polarizer 42 is formed by providing the adhesive layer 44 on the surface.
- the light-diffusion polarizing sheet 41 is manufactured by affixing the base film 43b of the light-diffusion layer 43 formed on the adhesion layer 44 of the polarizer 42 as mentioned above.
- the light diffusion layer 43 including the light diffusion portion 43 a and the base film 43 b is attached to the polarizing layer 4 through the adhesive layer 44, so that the light diffusion layer 43 functions as a protective layer for the polarizing layer 4.
- the thickness of the protective layer can be reduced.
- the light diffusion layer 43 is formed by forming the light diffusion portion 43a on the base film 43b, and then the light diffusion layer 43 is bonded to the polarizer 42, the light diffusion layer 43 can be easily manufactured.
- a light shielding material having a refractive index lower than that of the light diffusion layer 43 other than the concave portion and higher than that of air is filled in the concave portion of the light diffusion portion 43a of the light diffusion layer 43. Therefore, the light incident on the recess from the polarizer 42 side is totally reflected or transmitted at the interface due to the difference in refractive index between the inside and outside of the recess. Then, the totally reflected light passes through the light diffusing portion and is emitted to the outside, and the transmitted light is absorbed by the light shielding material. Therefore, the generation of stray light can be suppressed while realizing a wide viewing angle.
- a light-shielding material conventionally known materials can be suitably used. Note that the light diffusion layer 43 according to the present embodiment can be configured in the same manner as in other embodiments.
- FIG. 5 is a cross-sectional view showing a light diffusion polarizing sheet 51 according to another embodiment of the present invention.
- the light diffusion polarizing sheet 51 includes a light diffusion layer 53 having a base film 53b on the surface facing the polarization layer 4 in the light diffusion portion 53a, and the light diffusion portion 53a is an adhesive layer. It differs from the other embodiments in that it is affixed to the polarizing layer 4 via 54.
- the inside of the recessed part provided in the observation surface (surface which faces back to the polarizer 52) of the light-diffusion part 53a of the light-diffusion layer 53 also differs from other embodiment also in the point filled with gas. .
- the liquid crystal panel 50 is different from FIGS. 1, 3 and 4 in that the liquid crystal cell 8 is located in the upper part of the figure, but only in the direction shown in the figure, its function, application and use. The method and the like are the same as those of the liquid crystal panel shown in the other drawings.
- the adhesive layer 54 is formed on the surface facing the surface to which the first protective layer 6 is attached in the polarizing layer 4 to which the first protective layer 6 is attached via the adhesive layer 5.
- a polarizer 52 provided, a light diffusing portion 53 a and a base film 53 b are provided, and a light diffusing portion 53 is attached to the polarizer 52 through an adhesive layer 54. Then, the surface of the polarizer 52 facing the polarizing layer 4 of the first protective layer 6 is attached to the liquid crystal cell 8 via the adhesive layer 7 to constitute the liquid crystal panel 50.
- the light diffusing layer 53a is formed by providing a concave portion that is recessed toward the polarizing layer 4 from an observation surface (a surface facing the polarizing layer 4 or a light emitting surface) of the high refractive index material layer formed of a high refractive index material. . And the base film 53b is bonded together on the light-diffusion layer 53a so that the said recessed part may be plugged, and the light-diffusion layer 53 is comprised. And when bonding the base film 53b to the light-diffusion layer 53a, the inside of a recessed part is filled with gas, such as air.
- the 1st protective layer 6 is first affixed on the one surface of the polarizing layer 4 via the contact bonding layer 5, and the 1st protective layer of the polarizing layer 4 is included.
- a polarizer 52 is formed by providing an adhesive layer 54 on the surface facing away from the surface.
- the light-diffusion polarizing sheet 51 is manufactured by affixing the light-diffusion part 53a of the light-diffusion layer 53 formed as mentioned above to the contact bonding layer 54 of the polarizer 52.
- the light diffusion layer 53 including the light diffusion portion 53 a and the base film 53 b is attached to the polarizing layer 4 via the adhesive layer 54, so that the light diffusion layer 53 functions as a protective layer for the polarizing layer 4.
- the thickness of the protective layer can be reduced.
- the base film 53b is located on the outermost surface of the display surface facing away from the liquid crystal cell 8 and does not exist on the liquid crystal cell 8 side with respect to the light diffusion portion 53a, the base film 53b The thickness of the base film can be reduced. Thereby, the generation of the oblique double image can be sufficiently suppressed, and the number of members and the number of man-hours can be reduced by reducing the protective layer. Therefore, the cost can be reduced by improving the throughput and the yield.
- the concave portion of the light diffusing portion 53a of the light diffusing layer 53 is filled with gas, the light incident on the concave portion from the polarizer 2 side at the interface due to the refractive index difference between the inside and outside of the concave portion. The light is totally reflected, passes through the light diffusion portion 53a, and is emitted to the outside.
- the refractive index difference is larger than when a low refractive index material such as resin is filled. Therefore, a wide viewing angle can be realized.
- the gas filled in the recess is not particularly limited as long as the refractive index in the recess is lower than that outside the recess. Note that the light diffusion layer 53 according to the present embodiment can be configured in the same manner as in other embodiments.
- FIG. 6 is a cross-sectional view showing a light diffusion polarizing sheet 61 according to another embodiment of the present invention.
- the light diffusing polarizing sheet 61 includes a light diffusing layer 63 having a base film 63b on the surface facing the polarizing layer 4 in the light diffusing portion 63a.
- the second protective layer 65 is provided between the part 63a and the polarizing layer 4 via the adhesive layer 64, and the light diffusion part 63a is attached to the adhesive layer 66 provided on the second protective layer 65. This is different from the other embodiments.
- the liquid crystal panel 60 is different from FIGS. 1, 3, and 4 in that the liquid crystal cell 8 is located in the upper part of the figure, but only in the direction shown in the figure, its function, application, use The method and the like are the same as those of the liquid crystal panel shown in the other drawings.
- the light diffusing polarizing sheet 61 includes a second protective layer on the surface facing the first protective layer 6 in the polarizing layer 4 to which the first protective layer 6 is attached via the adhesive layer 5 via the adhesive layer 64. 65, a polarizer 62 having an adhesive layer 66 provided on the second protective layer 65, a diffusion part 63a, and a base film 63b.
- the light diffusion part 63a is polarized through the adhesive layer 66.
- a surface of the polarizer 62 facing away from the surface of the first protective layer 6 on which the polarizing layer 4 is provided is attached to the liquid crystal cell 8 via the adhesive layer 7 to constitute the liquid crystal panel 60.
- the polarizer 62 can be formed by providing the adhesive layer 66 after being formed in the same manner as the polarizer 32 shown in FIG. 3.
- the light diffusing layer 63 is formed with a light-shielding low refractive index material on the base film 63b, for example, to form a convex portion having a substantially V-shaped cross section with a tapered polarizing layer 4 side, and is highly refracted so as to cover the convex portion. It can be formed by forming a rate material layer.
- the light-diffusion part 63 is comprised by the light-diffusion part 63a and the base film 63b.
- the light diffusion polarizing sheet 61 can be manufactured by attaching the light diffusion portion 63a of the light diffusion layer 63 to the adhesive layer 66 of the polarizer 62 formed in this way. Note that the light diffusion layer 63 according to the present embodiment can also be configured in the same manner as other embodiments.
- the base film 63b is located on the outermost surface of the display surface facing away from the liquid crystal cell 8, and does not exist on the liquid crystal cell 8 side than the light diffusion portion 63a. Therefore, the thickness of the base film can be reduced at the distance from the liquid crystal cell 8 to the light diffusion portion 63a. Thereby, it is possible to sufficiently suppress the generation of an oblique double image. Moreover, since the thing which formed the adhesive layer 66 in the conventional polarizing plate which can be obtained commercially can be used as the polarizer 62, development cost can be held down.
- the light diffusing layer is preferably provided directly on the polarizing layer.
- a polarizing layer and a light-diffusion layer are integrated by forming a light-diffusion layer directly on a polarizing layer on the basis of a polarizing layer. Therefore, it is not necessary to provide protective layers on both sides of the polarizing layer, which is necessary for a conventional polarizing plate, and the light diffusing layer plays the role of one protective layer. Moreover, it is not necessary to form a light diffusion layer based on the base film required for the conventional light diffusion layer, and the polarizing layer plays the role.
- the distance from the liquid crystal cell to the light diffusing portion is more than that provided with the conventional polarizing plate and the light diffusing layer. It will be much shorter. Therefore, it is possible to suppress a decrease in visibility due to the occurrence of image blur such as an oblique double image due to the distance from the liquid crystal cell to the light diffusion portion. Further, since the number of members and man-hours are reduced, throughput and yield are improved, and cost reduction can be realized.
- the polarizer may include a second protective layer attached to the polarizing layer via a second adhesive layer between the polarizing layer and the light diffusion layer. Furthermore, it is preferable to provide.
- the light-diffusion layer is directly formed on the 2nd protective layer provided in the polarizing layer of the polarizer, compared with the case where the conventional polarizing plate and a light-diffusion sheet are used,
- the base film can be reduced. Therefore, the distance from the liquid crystal cell to the light diffusing portion is shortened by the thickness of the base film, the occurrence of image blur such as an oblique double image is suppressed, and the visibility is improved. Moreover, it can be manufactured at a low cost with a small number of members. Furthermore, a commercially available conventional polarizing plate provided with protective layers on both sides of the polarizing layer may be used as a polarizer, thereby reducing development costs.
- the light diffusion layer further includes a base portion that supports the light diffusion portion between the polarization layer and the light diffusion portion.
- the light diffusing layer provided with the light diffusing portion and the base portion is attached to the polarizing layer, so that the light diffusing layer functions as a protective layer for the polarizing layer, and the thickness of the protective layer is reduced. can do.
- the light diffusing layer can be bonded to the polarizing layer after the light diffusion layer is formed on the base portion, the light diffusion layer can be easily manufactured.
- the light diffusing layer further includes a base portion supporting the light diffusing portion on a surface facing the surface where the polarizing layer is provided in the light diffusing portion. It is preferable.
- a light-diffusion layer functions as a protective layer of a polarizing layer by sticking the light-diffusion layer provided with the light-diffusion part and the base part to a polarizing layer, and reduces the thickness for a protective layer be able to.
- the base portion is located on the outermost surface of the display surface facing the liquid crystal cell and does not exist on the liquid crystal cell side with respect to the light diffusion portion, the thickness of the base portion is set at the distance from the liquid crystal cell to the light diffusion portion. Can be reduced.
- the light diffusion layer can be bonded to the polarizing layer after forming the light diffusion layer by forming the light diffusion portion on the base portion, it is easy to manufacture the light diffusion layer.
- the light diffusing portion is provided with a plurality of concave portions recessed from the surface facing the polarizing layer toward the polarizing layer.
- the cross-sectional shape when the concave portion is cut by a surface penetrating the surface facing the polarizing layer and the surface facing the polarizing layer is substantially V-shaped with the surface facing the polarizing layer tapered. Is preferred.
- the light incident on the light diffusion portion from the polarizing layer side is totally reflected at the interface of the concave portion.
- the light diffusing part can be transmitted to the outside. This realizes a wide viewing angle.
- the concave portion is filled with a translucent material having a refractive index lower than that of the light diffusing portion other than the concave portion and having a higher refractive index than air. It is preferable.
- the light incident on the light diffusion portion from the polarizing layer side is totally reflected at the interface of the concave portion.
- the light diffusing part can be transmitted to the outside. This realizes a wide viewing angle.
- the concave portion is filled with a light-shielding material having a refractive index lower than that of the light diffusion portion other than the concave portion and a refractive index higher than that of air. Is preferred.
- the light incident on the light diffusing portion from the polarizing layer side is totally reflected or transmitted at the interface of the concave portion. To do. Then, the totally reflected light is transmitted through the light diffusing portion and emitted to the outside, and the transmitted light is absorbed by the light shielding material. Therefore, the generation of stray light can be suppressed while realizing a wide viewing angle.
- the recess is filled with gas.
- the second adhesive layer is provided on the surface of the polarizer facing the first protective layer in the polarizing layer before the light diffusing layer forming step. It is preferable that a second protective layer forming step of forming a second protective layer is further included, and in the light diffusion layer forming step, the light diffusion layer is formed on the second protective layer.
- the base film is compared with the case where the conventional polarizing plate and the light diffusion sheet are used. Can be reduced. Therefore, the distance from the liquid crystal cell to the light diffusing portion is shortened by the thickness of the base film, and it is possible to manufacture a light diffusing polarizing sheet with improved visibility by suppressing the occurrence of image blur such as an oblique double image. Moreover, it can be manufactured at a low cost with a small number of members.
- a high refractive index material layer is formed on the polarizing layer, and the high refractive index material layer has a back to the polarizing layer. It is preferable that the light diffusion layer is formed by forming a plurality of concave portions recessed on the polarizing layer side on the facing surface and filling the concave portions with a low refractive index material.
- the high refractive index material layer diffusing portion for diffusing the light incident on the light diffusing layer is formed of the high refractive index material, and the recess formed in the high refractive index material layer is filled with the low refractive index material.
- viewing angle free due to the difference in refractive index is realized.
- achieved the wide viewing angle can be manufactured easily and accurately.
- a high refractive index material layer is formed on the polarizing layer, and the high refractive index material layer has a back to the polarizing layer.
- the light diffusion layer is formed by forming a plurality of recesses recessed on the polarizing layer side on the surface facing and covering the recesses with a base film in a state in which the recesses are filled with gas. .
- the difference in refractive index between the material forming the light diffusion layer and the recess having a substantially V-shaped cross section is larger than filling with resin. Therefore, a light diffusing polarizing sheet that allows light incident on the light diffusing part from the polarizing layer side to efficiently be totally reflected at the interface, and the totally reflected light can pass through the light diffusing part and be emitted to the outside easily. And it can manufacture with sufficient precision.
- the method of manufacturing a light diffusion polarizing sheet according to the present invention includes a step of forming a convex portion using a low refractive index material on a base film, and a high refractive index material on the base film so as to cover the convex portion.
- a step of forming a layer, and in the light diffusion layer formation step, the light diffusion layer is preferably formed by attaching the high refractive index material layer to the polarizing layer.
- a convex part is formed on a base film using a low refractive index material, a high refractive index material layer is formed by covering the said convex part with a high refractive index material, and a light-diffusion layer is formed.
- the light-diffusion polarizing sheet which suppresses generation
- the present invention can be suitably used for various display devices such as a liquid crystal display device.
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Abstract
Description
本発明に係る光拡散偏光シート1の一実施形態について、図1及び図2の(a)及び(b)を参照して以下に説明する。図1は、本発明の一実施形態に係る光拡散偏光シート1を示す断面図であり、図2の(a)及び(b)は、液晶セルから光の光路を説明する模式図である。図1に示すように、光拡散偏光シート1は、偏光子2及び光拡散層3を備えている。偏光子2は、偏光層4と、接着層(第1接着層)5を介して偏光層4に貼り付けられた第1保護層6とを備えている。偏光子2において、偏光層4の第1保護層6に背向する面(偏光層4の第1保護層6が設けられていない側の面)に、光拡散層3が直接設けられている。そして、偏光子2において、第1保護層6の偏光層4に背向する面(偏光層4が設けられていない側の面)を、接着層7を介して液晶セル(液晶セル層)8に貼り付けることによって、液晶パネル10を構成する。なお、光拡散偏光シート1及び液晶パネル10を構成する各層は、透光性である。
本発明の他の実施形態に係る光拡散偏光シート31について、図3を参照して以下に説明する。図3は、本発明の他の実施形態に係る光拡散偏光シート31を示す断面図である。図3に示すように、光拡散偏光シート31は、光拡散部である光拡散層3と偏光層4との間に接着層(第2接着層)33及び第2保護層34を備えた点において、他の実施形態と異なっている。また、光拡散層3の観察面(偏光子32に背向する面)に設けられた凹部内は、光拡散層3の凹部以外の部分よりも屈折率が低く、空気よりも屈折率の高い透光性材料が充填されている点においても、他の実施形態と異なっている。本実施形態においては、第1実施形態と異なる点についてのみ説明し、他の詳細については省略する。
本発明の他の実施形態に係る光拡散偏光シート41について、図4を参照して以下に説明する。図4は、本発明の他の実施形態に係る光拡散偏光シート41を示す断面図である。図4に示すように、光拡散偏光シート41は、光拡散層43が、光拡散部43aと偏光層4との間にベースフィルム(ベース部)43bを備え、ベースフィルム43bが接着層44を介して偏光層4に貼り付けられている点において、他の実施形態と異なっている。また、光拡散層43の光拡散部43aの観察面(偏光子32に背向する面)に設けられた凹部内は、光拡散層部43aの凹部以外の部分よりも屈折率が低く、空気よりも屈折率の高い遮光性材料が充填されている点においても、他の実施形態と異なっている。本実施形態においては、他の実施形態と異なる点についてのみ説明し、他の詳細については省略する。
本発明の他の実施形態に係る光拡散偏光シート51について、図5を参照して以下に説明する。図5は、本発明の他の実施形態に係る光拡散偏光シート51を示す断面図である。図5に示すように、光拡散偏光シート51は、光拡散層53が、光拡散部53aにおいて、偏光層4に背向する面にベースフィルム53bを備えており、光拡散部53aが接着層54を介して偏光層4に貼り付けられている点において、他の実施形態と異なっている。また、光拡散層53の光拡散部53aの観察面(偏光子52に背向する面)に設けられた凹部内は、気体が充填されている点においても、他の実施形態と異なっている。本実施形態においては、他の実施形態と異なる点についてのみ説明し、他の詳細については省略する。なお、図5において、液晶パネル50は、液晶セル8が図中上部に位置する点において、図1、3及び4と異なっているが、図示する方向が異なるのみで、その機能、用途、使用方法等は他の図に示された液晶パネルと同様である。
本発明の他の実施形態に係る光拡散偏光シート61について、図6を参照して以下に説明する。図6は、本発明の他の実施形態に係る光拡散偏光シート61を示す断面図である。図6に示すように、光拡散偏光シート61は、光拡散層63が、光拡散部63aにおいて、偏光層4に背向する面にベースフィルム63bを備えており、偏光子62において、光拡散部63aと偏光層4との間に接着層64を介して第2保護層65が設けられ、第2保護層65上に設けられた接着層66に光拡散部63aが貼り付けられた点において、他の実施形態と異なっている。本実施形態においては、他の実施形態と異なる点についてのみ説明し、他の詳細については省略する。なお、図6において、液晶パネル60は、液晶セル8が図中上部に位置する点において、図1、3及び4と異なっているが、図示する方向が異なるのみで、その機能、用途、使用方法等は他の図に示された液晶パネルと同様である。
2 偏光子
3 光拡散層
4 偏光層
5 接着層(第1接着層)
6 第1保護層
7 接着層
8 液晶セル
10 液晶パネル
Claims (15)
- 第1接着層を介して第1保護層が貼り付けられた偏光層を備えた偏光子と、
上記偏光子側から入射し、その厚さ方向に透過する光を拡散する光拡散部を備え、上記偏光層の上記第1保護層に背向する面に設けられた光拡散層と
を備えていることを特徴とする光拡散偏光シート。 - 上記光拡散層は上記偏光層上に直接設けられていることを特徴とする請求項1に記載の光拡散偏光シート。
- 上記偏光子は、上記偏光層と上記光拡散層との間において、第2接着層を介して上記偏光層に貼り付けられた第2保護層をさらに備えていることを特徴とする請求項1に記載の光拡散偏光シート。
- 上記光拡散層は、上記偏光層と上記光拡散部との間に、上記光拡散部を支持するベース部をさらに備えていることを特徴とする請求項1に記載の光拡散偏光シート。
- 上記光拡散層は、上記光拡散部において上記偏光層が設けられた面に背向する面に、上記光拡散部を支持するベース部をさらに備えていることを特徴とする請求項1に記載の光拡散偏光シート。
- 上記光拡散部には、上記偏光層に背向する面から上記偏光層側に窪んだ複数の凹部が設けられており、当該凹部を上記偏光層に背向する面と上記偏光層に対向する面とを貫く面により切断したときの断面形状は、上記偏光層に対向する面側が先細った略V字形状であることを特徴とする請求項1~5のいずれか1項に記載の光拡散偏光シート。
- 上記凹部内は、上記光拡散部の上記凹部以外の部分よりも屈折率が低く、空気よりも屈折率の高い透光性材料が充填されていることを特徴とする請求項6に記載の光拡散偏光シート。
- 上記凹部内は、上記光拡散部の上記凹部以外の部分よりも屈折率が低く、空気よりも屈折率の高い遮光性材料が充填されていることを特徴とする請求項6に記載の光拡散偏光シート。
- 上記凹部内は、気体が充填されていることを特徴とする請求項6に記載の光拡散偏光シート。
- 第1接着層を介して第1保護層が貼り付けられた偏光層を備えた偏光子において、上記偏光層の上記第1保護層に背向する面に、上記偏光子側から入射し、その厚さ方向に透過する光を拡散する光拡散部を備えた光拡散層を形成する光拡散層形成工程を包含することを特徴とする光拡散偏光シートの製造方法。
- 上記光拡散層形成工程の前に、上記偏光子の上記偏光層において上記第1保護層に背向する面に、第2接着層を介して第2保護層を形成する第2保護層形成工程をさらに包含し、
上記光拡散層形成工程において、上記第2保護層上に光拡散層を形成することを特徴とする請求項10に記載の光拡散偏光シートの製造方法。 - 上記光拡散層形成工程において、上記偏光層上に高屈折率材料層を形成し、当該高屈折率材料層において、上記偏光層に背向する面に、上記偏光層側に窪んだ複数の凹部を形成し、当該凹部内に低屈折率材料を充填することによって、上記光拡散層を形成することを特徴とする請求項10に記載の光拡散偏光シートの製造方法。
- 上記光拡散層形成工程において、上記偏光層上に高屈折率材料層を形成し、当該高屈折率材料層において、上記偏光層に背向する面に、上記偏光層側に窪んだ複数の凹部を形成し、当該凹部内に気体を充填した状態で、当該凹部をベースフィルムで覆うことによって、上記光拡散層を形成することを特徴とする請求項10に記載の光拡散偏光シートの製造方法。
- ベースフィルム上に低屈折率材料を用いて凸部を形成する工程と、
上記凸部を覆うように上記ベースフィルム上に高屈折率材料層を形成する工程とをさらに包含し、
上記光拡散層形成工程において、上記高屈折率材料層を上記偏光層に貼り付けることによって、上記光拡散層を形成することを特徴とする請求項10に記載の光拡散偏光シートの製造方法。 - 請求項1~9のいずれか1項に記載の光拡散偏光シートと、
上記光拡散偏光シートに貼り付けられた液晶セル層とを備えた液晶パネルを備えていることを特徴とする表示装置。
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- 2010-11-19 WO PCT/JP2010/070710 patent/WO2011065309A1/ja active Application Filing
- 2010-11-19 CN CN201080038840.7A patent/CN102483474B/zh not_active Expired - Fee Related
- 2010-11-19 US US13/391,922 patent/US20120154719A1/en not_active Abandoned
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Also Published As
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US20120154719A1 (en) | 2012-06-21 |
CN102483474A (zh) | 2012-05-30 |
CN102483474B (zh) | 2014-04-23 |
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