WO2006035837A1 - 光学素子及びこれを用いた偏光面光源並びにこれを用いた表示装置 - Google Patents
光学素子及びこれを用いた偏光面光源並びにこれを用いた表示装置 Download PDFInfo
- Publication number
- WO2006035837A1 WO2006035837A1 PCT/JP2005/017886 JP2005017886W WO2006035837A1 WO 2006035837 A1 WO2006035837 A1 WO 2006035837A1 JP 2005017886 W JP2005017886 W JP 2005017886W WO 2006035837 A1 WO2006035837 A1 WO 2006035837A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- optical element
- light source
- liquid crystal
- translucent resin
- Prior art date
Links
Classifications
-
- 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
- G02B6/0041—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided in the bulk of the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0247—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of voids or pores
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0284—Diffusing elements; Afocal elements characterized by the use used in reflection
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3008—Polarising elements comprising dielectric particles, e.g. birefringent crystals embedded in a matrix
-
- 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
- G02B6/0056—Means for improving the coupling-out of light from the light guide for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements
-
- 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
- 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
- G02F1/1336—Illuminating devices
- G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
Definitions
- the present invention relates to an optical element, a polarization plane light source using the same, and a display device using the same.
- the present invention relates to an optical element capable of emitting light excited and emitted through incident light as linearly polarized light having a predetermined vibration surface from at least one of the front and back surfaces, and the use thereof.
- the present invention relates to a V, polarization plane light source, and a display device using the same.
- a reflective dot containing a high-reflectance pigment such as titanium oxide or barium sulfate is also applied to a light-transmitting resin plate. It is known that a light emitting means is provided, and transmitted light by total reflection in the resin board is emitted from one of the front and back surfaces of the resin board by scattering or the like through the light emitting means.
- the liquid crystal display converts the emitted light into linearly polarized light through a polarizing plate.
- the light use efficiency cannot exceed 50% because light absorption loss is caused by the polarizing plate.
- the inventors of the present invention to solve the above-described problems, the light excited and emitted via incident light is converted into linearly polarized light having a predetermined vibration surface from at least one of the front and back surfaces.
- An optical element that can emit light and whose polarization direction (vibration plane) can be controlled arbitrarily Developed see Patent Document 14).
- Patent Document 14 discloses an example using powder of tris (8 quinolinolato) aluminum (generally referred to as Alq3) as a light emitter.
- Alq3 tris (8 quinolinolato) aluminum
- all commercially available Alq3 used has a particle size of several tens / zm or more.
- the light power emitted by the excitation light entering the optical element and emitted to the outside of the optical element does not necessarily have a sufficient degree of polarization. It was divided that it might not have.
- a light emitter having a particle diameter larger than a predetermined value there are problems in that the appearance of the optical element is deteriorated and it is difficult to manufacture the optical element.
- Patent Document 1 Japanese Patent Laid-Open No. 6-18873
- Patent Document 2 JP-A-6-160840
- Patent Document 3 Japanese Patent Laid-Open No. 6-265892
- Patent Document 4 JP-A-7-72475
- Patent Document 5 JP-A-7-261122
- Patent Document 6 Japanese Patent Laid-Open No. 7-270792
- Patent Document 7 JP-A-9-54556
- Patent Document 8 JP-A-9-105933
- Patent Document 9 Japanese Patent Laid-Open No. 9-138406
- Patent Document 10 JP-A-9 152604
- Patent Document 11 JP-A-9 293406
- Patent Document 12 JP-A-9 326205
- Patent Document 13 Japanese Patent Laid-Open No. 10-78581
- Patent Document 14 Japanese Unexamined Patent Application Publication No. 2004-205953
- the present invention has been made to solve such problems of the prior art, and linearly polarized light having a sufficient degree of polarization of at least one of the front and back surfaces of light excited and emitted through incident light. And an optical element that can be easily manufactured without causing appearance defects and can easily increase the luminance of the emitted light, a polarization plane light source using the optical element, and a display device using the optical element The task is to do.
- the inventors of the present invention to solve the above-mentioned problems, as a result of intensive studies, have determined that the particle size of the light-transmitting resin and the light-emitting body dispersed in the Z or microregion portion is larger than the emission wavelength. If it is small, the light emitted by the illuminant by incident light can be emitted as linearly polarized light having a sufficient degree of polarization at least one of the front and back surfaces, and it is easy to produce without causing poor appearance, and the brightness of the emitted light
- the present invention has been completed by finding that an optical element capable of easily increasing the above is obtained.
- the present invention relates to a translucent resin, a microregion part that is dispersed and distributed in the translucent resin, and has a birefringence different from the translucent resin, and the translucent resin.
- an optical element having a plate-like shape having at least one type of light emitter dispersed in oil and Z or in the minute region, having a particle size smaller than the emission wavelength and having a particle size.
- the present invention it is not necessary to provide a special light emitting means for reflecting dots and the like to the translucent resin as in the prior art, and light is emitted inside the optical element (light emitter) by incident excitation light.
- the emitted light can be emitted to the outside as linearly polarized light having a predetermined vibration surface. Also
- the polarization direction (vibration plane) of linearly polarized light can be arbitrarily set according to the installation angle of the optical element (depending on which direction ⁇ described later is set).
- the selective polarization scattering as described above does not occur, and therefore, the excitation light emission is caused by the light emitter in the optical element. Due to the solid angle, about 80% of the light is trapped in the translucent resin and repeats total reflection.
- the confined light is emitted to the outside of the optical element only when the total reflection condition is broken due to scattering at the interface between the minute region portion and the translucent resin. Therefore, the emission efficiency can be controlled arbitrarily according to the size and distribution rate of the micro area.
- the light scattered at an angle larger than the total reflection angle in the scattering in the ⁇ direction, the light that does not collide with the microscopic area, and the light having a vibration surface other than the ⁇ direction are optical elements. It is confined inside and transmitted while repeating total reflection, and the polarization state is canceled by the birefringence phase difference in the optical element, etc., and satisfies the ⁇ direction condition (linear polarization with a vibration plane parallel to the ⁇ direction). And wait for the opportunity to exit.
- linearly polarized light having a predetermined vibration surface is efficiently emitted from the optical element.
- the particle size of the illuminant is larger than a predetermined value, as shown in FIG. 1 (a), it is obtained by exciting light by one illuminant in the optical element and colliding with a minute region.
- the linearly polarized light (linearly polarized light having a vibration plane parallel to the ⁇ direction) L satisfies the condition that it can be emitted to the outside of the optical element.
- the collision may cause scattering and depolarization, resulting in a decrease in the degree of polarization of the emitted light.
- linearly polarized light L Since the particle size of the light body is smaller than its emission wavelength (visible light region)! / ⁇ (and therefore smaller than the wavelength of linearly polarized light L), linearly polarized light L is It passes almost without being scattered by the illuminant 3, and there is almost no risk of depolarization. In other words, since light has the property of a wave, most of the objects that are smaller than the wavelength pass through without being affected. Therefore, it can be emitted as linearly polarized light having a sufficient degree of polarization.
- the particle size of the illuminant is smaller than the emission wavelength, the particle size of the illuminant is sufficiently small with respect to the thickness of the optical element assumed in practical use. When it protrudes from the surface of the optical element, there will be no appearance defect. In addition, when an optical element is manufactured, it is easy to manufacture without obstructing the formation of a microscopic area, and without causing the translucent resin to break when it is stretched. .
- the particle size of the light emitter is smaller than the light emission wavelength, it is possible to effectively increase the luminance of the light emitted from the optical element. As shown in FIG. 2, even if the light emitter 3 having the same total weight is dispersed in the optical element 10, if the particle diameter of the light emitter 3 to be dispersed is reduced (FIG. 2 (a)), This is because a larger number of light-emitting bodies 3 can be dispersed than in the case where the particle size is large (FIG. 2 (b)). For example, if the particle size of each light emitter 3 is 1Z2 under the same total weight, the total number of light emitters 3 is 8 times and the total surface area of light emitters 3 is 2 times.
- the excitation light emission of the light emitter 3 occurs on the surface of the light emitter 3, if the particle size of each light emitter 3 to be dispersed is reduced and the total surface area of the total number of light emitters 3 is increased, the amount of light emission is correspondingly increased. As a result, it is possible to effectively increase the luminance of the light emitted from the optical element force.
- light excited and emitted through incident light can be emitted as linearly polarized light having a sufficient degree of polarization on at least one of the front and back surfaces, and an appearance defect occurs. Therefore, the brightness of the emitted light can be easily increased.
- the luminous body is an inorganic pigment.
- the inorganic pigment has a high luminance (luminous efficiency) and can withstand long-term use with extremely high durability. Therefore, it is possible to obtain an optical element that is superior in light emission luminance, durability, and reliability as compared with the case of using a dye-based light emitter.
- the illuminant absorbs ultraviolet light or visible light and emits visible light. It is considered as a pigment.
- the luminous body may be a phosphorescent pigment that absorbs ultraviolet light or visible light and emits visible phosphorescence.
- the particle diameter of the light emitter is set to 1Z5 or less of the light emission wavelength of the light emitter.
- the particle size of the light emitter is more preferably 1Z10 or less of the light emission wavelength of the light emitter, and more preferably 1Z50 or less of the light emission wavelength of the light emitter.
- the diameter of the aggregate formed by the aggregation of the luminous body is smaller than the emission wavelength of the luminous body.
- the diameter of the aggregate formed by the aggregation of the luminous bodies is more preferably 1Z5 or less of the emission wavelength of the luminous bodies, more preferably
- the emission wavelength of the light emitter is 1Z10 or less.
- the minute region is formed of a liquid crystalline material, a glassy material in which a liquid crystal phase is cooled and fixed, or a material in which a liquid crystal phase of polymerizable liquid crystal is cross-linked and fixed by energy rays.
- the microregion portion is preferably composed of a liquid crystal polymer having a glass transition temperature of 50 ° C. or higher and exhibiting a nematic liquid crystal phase at a temperature lower than the glass transition temperature of the translucent resin. Is done.
- the difference in refractive index between the minute region portion and the translucent resin is a difference in the refractive index in the axial direction of the minute region portion where the difference in refractive index shows a maximum value.
- the translucent resin is used to absorb the excitation light.
- the light emission efficiency tends to decrease.
- material deterioration due to absorption of ultraviolet light may be caused. Therefore, by using a material that does not substantially absorb light of the excitation light wavelength as the material of the translucent resin and the minute region part, it is possible to reduce the decrease in luminous efficiency and material deterioration as much as possible. it can.
- the excitation light is ultraviolet light
- the translucent resin and the minute region portion are formed of a material force that does not substantially absorb ultraviolet light.
- the range of the wavelength band of ultraviolet light may be a range generally recognized as the wavelength band of ultraviolet light, for example, a range of about 1 to 400 nm.
- “substantially does not absorb ultraviolet light” means that it does not absorb ultraviolet light at all, and even if it absorbs, the light absorption rate at the excitation light wavelength is about 40% or less. Means that.
- the present invention is also provided as a polarization plane light source having the above-described optical element of the present invention and an excitation light source that emits light having a wavelength that can excite the light emitter dispersed in the optical element. .
- the translucent resin and the minute region are both formed of a material that does not substantially absorb ultraviolet light.
- the present invention also provides a polarization plane light source in which light having a wavelength capable of exciting the light emitter dispersed in the optical element is ultraviolet light.
- the polarization plane light source is further provided with a light guide formed with a translucent material force for guiding the light emitted from the excitation light source to the optical element.
- the excitation light source can also constitute, for example, an inorganic or organic electroluminescent device or a mercury-free fluorescent tube force.
- the present invention is also provided as a display device comprising the above-described polarization plane light source.
- light excited and emitted via incident light can be emitted as linearly polarized light having a sufficient degree of polarization from at least one of the front and back surfaces, and can be easily manufactured without causing appearance defects. It is possible to easily increase the brightness of the emitted light.
- FIG. 1 is a schematic diagram for explaining the influence of the particle size of a light emitter on light scattering.
- FIG. 2 is a schematic diagram for explaining the influence of the particle size of a light emitter on the light emission luminance.
- FIG. 3 is a longitudinal sectional view showing a schematic configuration of an optical element according to an embodiment of the present invention.
- FIG. 4 is a longitudinal sectional view showing a schematic configuration example of a polarization plane light source to which an optical element according to an embodiment of the present invention is applied.
- FIG. 5 is a longitudinal sectional view partially showing an example of a schematic configuration when another excitation light source is used in the polarization plane light source shown in FIG.
- FIG. 6 is a schematic diagram for explaining that uniform light emission can be easily obtained even if the excitation light source is a point light source if the optical element according to one embodiment of the present invention is applied.
- FIG. 3 is a longitudinal sectional view showing a schematic configuration of an optical element according to an embodiment of the present invention.
- the optical element 10 according to the present embodiment is distributed and distributed in the translucent resin 1 and the translucent resin 1, and the birefringence is different from the translucent resin 1.
- With a microscopic area 2 It is formed in a plate shape.
- the optical element 10 includes the translucent resin 1 and Z or the minute region portion.
- FIG. 2 is dispersed with at least one kind of phosphor 3 having a particle size smaller than the emission wavelength.
- 3 (a) shows an example in which the luminous body 3 is dispersed in the translucent resin 1
- FIG. 3 (b) shows an example in which the luminous body 3 is dispersed in the minute region 2.
- (c) shows an example in which the light-emitting body 3 is dispersed in both the translucent resin 1 and the minute region 2.
- the optical element 10 according to the present embodiment can have any one of the configurations shown in FIGS.
- the shape of the optical element 10 is not particularly limited as long as it is formed in a plate shape having at least two opposing flat surfaces. From the viewpoint of use as a surface light source and total reflection efficiency, As shown in FIG. 3, it is preferable that the film has a rectangular cross-section, sheet, or plate shape. In particular, it is desirable to form the film in terms of easy handling.
- the “plate shape” in the present invention is a concept including all these film shapes, sheet shapes and plate shapes.
- the thickness of the optical element 10 is preferably 20 ⁇ m to 3 mm, more preferably 30 ⁇ m to 1 mm, more preferably 40 ⁇ m to 500 ⁇ m, and particularly preferably 50 ⁇ m to 200 ⁇ m. ⁇ m.
- the thickness of the optical element 10 is less than 20 m, there is a risk that the excitation light emitted from the excitation light source may be transmitted as it is, or the unevenness of brightness may be caused by the scattering property in the minute region 2 being impaired. is there.
- the transmission path of the scattered light in the minute region 2 cannot be sufficiently secured, there is a possibility that linearly polarized light having a sufficient degree of polarization cannot be obtained.
- the thickness of the optical element 10 is thicker than 3 mm, the excitation light is not sufficiently transmitted in the thickness direction of the optical element 10, and it becomes impossible to effectively use all of the dispersed light emitters 3.
- the light emission efficiency of polarized light may be reduced. Therefore, it is preferable to set the thickness as described above.
- the two opposing surfaces 101, 102 (Fig. 3 (a)) of the optical element 10 have smoothness close to a mirror surface from the viewpoint of confinement efficiency that confines the light emitted from the light emitter 3 by total reflection. Is preferred. However, if the two facing surfaces 101 and 102 of the optical element 10 are not smooth enough, a light-transmitting film or sheet with excellent smoothness should be separately translucent with a transparent adhesive or adhesive. The same effect can be obtained by attaching the transparent surface of the translucent film or sheet to the total reflection interface.
- the luminous body 3 is uniform in one or both of the translucent resin 1 and the minute region 2. It is preferable to be dispersed in As described above, when light is scattered by the illuminant 3, there is a possibility that the polarization is eliminated. Therefore, the particle size of the illuminant 3 according to this embodiment is set to be smaller than the emission wavelength. In order to further reduce the possibility of depolarization, the particle size of the phosphor 3 is preferably 1Z5 or less of the emission wavelength of the phosphor 3, more preferably 1Z10 or less, and even more preferably 1Z50 or less. It is said.
- the particle size of the luminous body 3 By setting the particle size of the luminous body 3 to a dimension that produces a quantum effect (specifically, about 1 to about LOnm), even with the luminous body 3 having the same compositional power, the particle size can be reduced. Accordingly, light emitters 3 having different emission wavelengths can be produced. Therefore, if the phosphors 3 having different emission wavelengths according to the particle diameters are used (if the phosphors 3 having different particle diameters are appropriately combined), a single composition can be used without using a plurality of phosphors 3 having different compositions. A broad emission wavelength band can be obtained by appropriately controlling the particle size distribution of the phosphor 3.
- the particle size of the phosphor 3 can be measured using a dynamic light scattering particle size distribution measuring device manufactured by Otsuka Electronics Co., Ltd. or Horiba, Ltd., a laser zeta electrometer manufactured by Otsuka Electronics Co., Ltd. It is also possible to observe directly with, or measure by time-of-flight measurement as proposed by one Tsukuba Nanotechnology company. For example, if the phosphor 3 is obtained by pulverizing a large mass of the raw material of the illuminant 3, the pulverization conditions (time, rotational speed, pressure, temperature, etc.) are adjusted, and after pulverization, classification is performed by filtration or sedimentation.
- the phosphor 3 having a desired particle diameter. If the phosphor 3 is obtained by collecting and growing atoms and molecules, the phosphor with the desired particle size can be adjusted by adjusting the growth conditions (dispersion concentration, temperature, raw material supply rate, etc.). You can get 3. Furthermore, if the phosphor 3 is obtained by sputtering with an electron beam in a rare gas using the raw material of the phosphor 3 as a target, the power of the electron beam, the type and concentration of the rare gas, the properties of the target, etc. It is possible to obtain a light-emitting body 3 having a desired particle size by adjusting.
- the diameter of the aggregate formed by the aggregation of the luminous body 3 is smaller than the emission wavelength of the luminous body 3.
- the diameter of the aggregate formed by agglomeration of the illuminant 3 is more preferably 1Z5 or less, more preferably 1Z10 or less of the emission wavelength of the illuminant 3.
- the diameter of the aggregate can be measured by the same method as the particle diameter measuring method for the phosphor 3 alone.
- the light emitter 3 one or more suitable materials that absorb ultraviolet light or visible light and excite and emit light having a wavelength in the visible light region can be used.
- the light emitter is preferably an inorganic pigment.
- Inorganic pigments have high emission brightness and are extremely durable, and can withstand long-term use. Therefore, compared to when using dye-based phosphors, they are excellent in emission brightness and durability.
- the optical element 10 can be obtained. More specifically, fluorescent pigments that emit inorganic pigments that emit fluorescence with excitation singlet force, and phosphorescent pigments that emit inorganic pigments that emit phosphorescence with excitation triplet force. Etc. are preferably used.
- the refractive index of inorganic pigments is generally 2.0 or more, and is often opaque and colored.
- CdSe is colored from red to dark blue depending on the particle size and purity.
- the illuminant 3 it is a material for forming the resin 3 in which the illuminant 3 is dispersed (translucent resin 1 and minute region 2; most of which are 1.5 to 1.
- the light emitter 3 according to the present embodiment has a particle size smaller than the light emission wavelength, so that most of the excited light passes through without being affected by the light emitter 3, The above problems are unlikely to occur.
- the light emitter 3 prepared in advance in a material for forming the light-transmitting resin 1 or the minute region portion 2 when the optical element 10 is manufactured may have other additives as necessary.
- An organic metal compound for example, a reaction product of an organic acid such as acetic acid, benzoic acid, formic acid, butyric acid, tartaric acid, lactic acid, or succinic acid and a metal ion
- an organic phosphorus compound for example, phosphate esters
- the organometallic compound is thermally decomposed to form a cluster to form the phosphor 3, and the phosphor 3 thus formed in the resin (the material forming the translucent resin 1 and the microregion 2). How to distribute,
- Methods such as a method of growing the phosphor 3 by adding a surfactant to an aqueous solution in which metal ions are dissolved to form a cluster and circulating under reducing conditions can be appropriately used.
- the optical element 10 includes, for example, one or two or more suitable materials having excellent transparency, such as polymers and liquid crystals, in regions (diffractive in birefringence) by appropriate orientation treatment such as stretching treatment. It can be formed by an appropriate method such as a method of obtaining an oriented film using a combination in which the (region portion) is formed. As described above, since the illuminant 3 is dispersed in the optical element 10, it is preferable that at least one of the combined materials is miscible with the illuminant 3 to be dispersed.
- Examples of the combination of the materials include a combination of polymers and liquid crystals, a combination of isotropic polymer and anisotropic polymer, and a combination of anisotropic polymers.
- a combination that undergoes phase separation from the viewpoint of dispersion distribution of the minute region 2, it is preferable to use a combination that undergoes phase separation.
- the dispersion distribution can be controlled by the compatibility of the materials to be combined.
- phase separation can be performed by an appropriate method such as a method of dissolving an incompatible material with a solvent or a method of mixing an incompatible material with heating and melting.
- the blending ratio of the luminous body 3 is not particularly limited. However, if the blending ratio is too small, a necessary light emission amount cannot be obtained. Therefore, the blending ratio of the luminous body 3 is preferably 0.1% by weight or more, more preferably 0, 5% by weight or more, and further preferably 1.0% by weight or more. However, if the compounding ratio of the phosphor 3 is increased too much, it may affect the stretching and phase separation of the alignment substrate (the material forming the translucent resin 1 and the microregion group 2). A blending ratio in such a range that does not cause such an influence may be determined as appropriate. The upper limit of the mixing ratio of the phosphors is preferably 10% by weight or less, more preferably 5% by weight or less.
- the orientation treatment is carried out by a stretching treatment with the combination of the above materials, in the combination of polymers and liquid crystals and the combination of an isotropic polymer and an anisotropic polymer, anisotropy is caused by an arbitrary stretching temperature or stretching ratio.
- the desired optical element 10 can be formed by appropriately controlling the stretching conditions.
- the anisotropic polymer is classified as positive or negative based on the characteristics of the change in refractive index in the stretching direction, but in this embodiment, any positive or negative anisotropic polymer can be used, a combination of positive and negative, Both negative and positive / negative combinations can be used.
- polymers examples include ester polymers such as polyethylene terephthalate and polyethylene naphthalate, styrene polymers such as polystyrene and acrylonitrile / styrene copolymers (AS polymers), polyethylene, polypropylene, and cyclo polymers.
- ester polymers such as polyethylene terephthalate and polyethylene naphthalate
- styrene polymers such as polystyrene and acrylonitrile / styrene copolymers (AS polymers)
- AS polymers acrylonitrile / styrene copolymers
- Polyethylene polypropylene
- cyclo polymers Polyolefins having a norbornene structure
- olefinic polymers such as ethylene / propylene copolymers
- acrylic polymers such as polymethyl methacrylate
- cellulose polymers such as cellulose diacetate and cellulose triacetate
- carbonate-based polymers butyl chloride polymers, imide polymers, snolephone polymers, polyether sulfones, polyether ether ketones, polyphenylene norfeids, butyl alcohol polymers, vinylidene chloride polymers, butyl butyral.
- transparent polymers include mold polymers.
- examples of the liquid crystal include room temperature such as cyanobiphenol, cyanphenol cyclohexane, cyanphenol ester, benzoic acid ester, phenylpyrimidine, and mixtures thereof.
- room temperature such as cyanobiphenol, cyanphenol cyclohexane, cyanphenol ester, benzoic acid ester, phenylpyrimidine, and mixtures thereof.
- a liquid crystal polymer that exhibits a smectic phase at a room temperature or a high temperature may be used.
- the crosslinkable liquid crystal monomer is usually subjected to an alignment treatment and then subjected to a crosslinking treatment by an appropriate method using heat, light or the like to obtain a polymer.
- the upper limit of the glass transition temperature of the polymers is preferably 300 ° C. or lower, more preferably 250 ° C. or lower, and still more preferably 200 ° C. or lower.
- the liquid crystal polymer appropriate ones such as a main chain type and a side chain type can be used, and the kind thereof is not particularly limited.
- the degree of polymerization of the liquid crystal polymer is preferably 8 or more from the viewpoints of the formability of the micro-region part 2 having excellent uniformity in particle size distribution, thermal stability, film formability, and ease of alignment treatment. More preferably, it is 10 or more, particularly preferably 15 to 5000.
- the optical element 10 using a liquid crystal polymer is, for example, a liquid crystal prepared by mixing one or more kinds of polymers and one or more kinds of liquid crystal polymers for forming the microregion 2.
- the polymer film can be formed by forming a polymer film dispersed and contained in a state in which the polymer occupies a minute region, orienting it by an appropriate method, and forming a region having different birefringence.
- the liquid crystal polymer may be a glass transition. It is preferable to use one having a transition temperature of 50 ° C. or higher and exhibiting a nematic liquid crystal phase in a temperature range lower than the glass transition temperature of the combined polymer (translucent resin 1).
- the upper limit of the glass transition temperature of the liquid crystal polymer is preferably 250 ° C or lower, more preferably 200 ° C or lower, and further preferably 150 ° C or lower. Specific examples thereof include a side chain type liquid crystal polymer having a monomer unit represented by the following general formula.
- X is a skeleton group that forms the main chain of the liquid crystal polymer, and may be formed by an appropriate connecting chain such as linear, branched, or cyclic. Specific examples thereof include polyatalylates, polymetatalylates, polyhaloacrylates,
- —Cyanoaacrylates polyacrylamides, polyacrylonitriles, polyphthalarylnitriles, polyamides, polyesters, polyurethanes, polyethers, polyimides, polysiloxanes and the like.
- Y is a spacer group branched from the main chain.
- ethylene, propylene, butylene, pentylene, hexylene, octylene, decylene, undecylene, dodecylene, octadecylene, octadecylene, Ethoxyethylene, methoxybutylene and the like are preferable.
- Z is a mesogenic group that imparts liquid crystal orientation.
- the nematic alignment side chain type liquid crystal polymer may be an appropriate thermoplastic polymer such as a homopolymer having a monomer unit represented by the above general formula, or a copolymer having excellent monodomain alignment. Is preferred.
- the optical element 10 using a nematic alignment liquid crystal polymer exhibits, for example, a polymer for forming a polymer film and a nematic liquid crystal phase in a temperature range lower than the glass transition temperature of the polymer,
- the liquid crystal polymer that forms the microregion 2 is heat-treated to align it with the nematic liquid crystal phase, and the It can be formed by a method of cooling and fixing the orientation state.
- the upper limit of the glass transition temperature of the liquid crystal polymer is preferably 250 ° C or lower, more preferably 200 ° C or lower, and further preferably 150 ° C or lower.
- the polymer film (translucent resin 1) containing the microregions 2 before the orientation treatment in a dispersed manner, that is, the film subject to orientation treatment is, for example, a casting method, an extrusion molding method, an injection molding method, or the like.
- a casting method an extrusion molding method
- an injection molding method or the like.
- it is developed in a monomer state and polymerized by a heat treatment or radiation treatment such as ultraviolet rays to form a film. It can also be formed by a method or the like.
- the size and distribution of the microregion 2 can be controlled by the type of solvent, the viscosity of the mixed liquid, the drying speed of the mixed liquid spreading layer, and the like.
- the small area 2 of the micro area 2 it is effective to reduce the viscosity of the mixed liquid or to quickly dry the drying speed of the mixed liquid spreading layer.
- the thickness of the film to be oriented may be determined as appropriate, but in general, it is preferably 10 mm or less, more preferably 30 111 to 5111111, and even more preferably 50 from the viewpoint of orientation processability. ⁇ m to 2 mm, particularly preferably 100 ⁇ m to lmm.
- appropriate additives such as a dispersant, a surfactant, a color tone regulator, a flame retardant, a mold release agent, and an antioxidant can be blended.
- the alignment treatment may be performed by, for example, uniaxial, biaxial, sequential biaxial, Z-axis, or the like, a rolling method, an electric field or a magnetic field at a temperature equal to or higher than the glass transition temperature or the liquid crystal transition temperature, and quenching.
- An appropriate method that can control the refractive index by orientation such as a method for fixing orientation, a method for fluid orientation during film formation, and a method for self-aligning liquid crystals based on a slight orientation of an isotropic polymer. This can be done using seeds or two or more. Therefore, the obtained optical element 10 may be a stretched film or a non-stretched film.
- the orientation treatment can be suitably performed by using a rolling method or the like as the stretching treatment method. wear.
- the microregion portion 2 also has a liquid crystal polymer force
- the liquid crystal polymer dispersed and distributed in the polymer film is heated to a temperature exhibiting a target liquid crystal phase such as a nematic liquid crystal phase and melted.
- the alignment treatment can also be performed by a method of aligning the alignment state under the action of the alignment regulating force, quenching, and fixing the alignment state.
- the orientation state of the minute region 2 is preferably in a monodomain state from the viewpoint of preventing variation in optical characteristics.
- a liquid crystal polymer may be aligned such as a stretching force by a method of stretching a polymer film at an appropriate magnification, a shearing force during film formation, an electric field or a magnetic field.
- Appropriate regulatory force can be applied, and the liquid crystal polymer can be subjected to alignment treatment by applying one or two or more regulatory forces.
- Portions other than the minute region portion 2 in the optical element 10, that is, the translucent resin 1, may be birefringent or isotropic.
- the entire optical element 10 exhibiting birefringence can be obtained by molecular orientation in the above-described film forming process using oriented birefringent polymers as film forming polymers. If necessary, for example, a known orientation process such as a stretching process may be performed to impart or control birefringence.
- the optical element 10 other than the microregion 2 is isotropic, for example, using an isotropic polymer as a film-forming polymer, and the film has a glass transition temperature lower than that of the polymer. It can be obtained by a method of stretching in the temperature range.
- the translucent resin 1 and the microregion 2 are different in birefringence. Specifically, as described above, with respect to the refractive index difference between the minute region 2 and the transparent resin 1, the refraction in the axial direction ( ⁇ direction) of the minute region 2 at which the refractive index difference shows the maximum value.
- the difference in refractive index is ⁇ and the refractive index difference in the axial direction ( ⁇ 2 direction, ⁇ 3 direction) perpendicular to the axial direction showing the maximum value is ⁇ 2 and ⁇ 3, from the point of total reflection described later, ⁇
- ⁇ 2 and ⁇ 3 are as small as possible. It is preferable that ⁇ 2 and ⁇ 3 are as small as possible.
- the linearly polarized light in the ⁇ direction is strongly scattered among the light excited and emitted by the excitation light incident on the optical element 10, and the critical angle (total The amount of light emitted from the optical element 10 to the outside can be increased by being scattered at an angle smaller than the reflection angle), while linearly polarized light in other directions is difficult to be scattered. Can be confined inside 10.
- the refractive index difference ( ⁇ 1, ⁇ 2, and ⁇ 3) between each axial direction of the microregion 2 and the translucent resin 1 is that the translucent resin 1 is optically isotropic. In some cases, this means the difference between the refractive index in the axial direction of the minute region 2 and the average refractive index of the translucent resin 1. In addition, when the translucent resin 1 is optically anisotropic, the main optical axis direction of the translucent resin 1 and the main optical axis direction of the minute region 2 are usually the same. Therefore, the above refractive index difference means a difference in refractive index in each axial direction.
- the ⁇ direction is parallel to the plane of vibration of the linearly polarized light emitted from the optical element 10, it is preferable that the ⁇ direction is parallel to the two opposite surfaces 101 and 102 of the optical element 10. . As long as the two surfaces 101 and 102 are parallel to each other, the ⁇ direction can be an appropriate direction according to the liquid crystal cell to which the optical element 10 is applied.
- the minute region portions 2 in the optical element 10 are distributed as evenly as possible from the viewpoint of the uniformity of the scattering effect in the minute region portion 2 and the like.
- the size of the micro area 2, especially the length in the ⁇ direction, which is the scattering direction, affects the backscattering (reflection) and wavelength dependence. Minimal in terms of light utilization efficiency, prevention of coloration due to wavelength dependence, prevention of visual impairment due to visualization of minute area 2 or prevention of clear display, and film formation properties and film strength.
- the preferred size of the region 2, particularly the length in the ⁇ direction is preferably 0.5 to 500 m, more preferably 0.1 to 250 m, and particularly preferably 1 to LOO m.
- the microregion 2 is usually present in the optical element 10 in a domain state, but there is no particular limitation on the length in the ⁇ n2 direction or the like!
- the ratio of the minute region portion 2 in the optical element 10 is a force that can be appropriately determined from the viewpoint of the scattering property in the ⁇ direction. In general, it is preferably 0. It is 1 to 70% by weight, more preferably 0.5 to 50% by weight, particularly preferably 1 to 30% by weight.
- the optical element 10 can form a polarization plane light source by combining with an excitation light source that emits light having a wavelength that can excite the light emitter 3 dispersed in the optical element 10. It is.
- the arrangement of the excitation light source and the optical element 10 is not particularly limited, but it is desirable that the excitation light is effectively incident on the optical element 10. From this point of view, as shown in FIG. 4, a configuration in which the excitation light source 9 is arranged on the side surface of the optical element 10, and as shown in FIG. 5, the excitation light source 9 is a surface light source such as an electret luminescence element. It is preferable that the optical element 10 be arranged so that the flat surfaces of the optical element 10 face each other. As shown in FIG.
- the optical element 10 may be arranged as it is, or may be integrated with the excitation light source 9 or a translucent support through a translucent adhesive layer or the like. . It is also preferable to provide a light guide for guiding light from the excitation light source into the optical element 10 more efficiently.
- the light guide is not particularly limited.
- a flat plate made of a translucent resin, a wedge-shaped light guide plate, or a light guide plate provided with a reflective dot on the resin is generally used for a backlight of a liquid crystal display. What is used can be used conveniently.
- the type of the excitation light source 9 is not particularly limited as long as it is an excitation light source that emits light having a wavelength capable of exciting the light emitter 3, but the light emitter 3 is basically used.
- an excitation light source that emits visible light is used as the excitation light source 9, if the visible light itself that is the excitation light is transmitted, color reproducibility is likely to be hindered.
- the setting when making white light, the setting must also take into account the transmission of the light of the excitation light source power, and this setting becomes complicated.
- an excitation light source that emits ultraviolet light is used as the excitation light source 9
- YAG: Ce cerium-doped yttrium / aluminum 'garnet
- the illuminant 3 such as whitening of the light emitting diode (LED).
- the pseudo-white light is created by using the emission of the yellow phosphor and the transmitted blue light of the excitation light, Although this pseudo white light lacks a red component, the color reproducibility is inferior. Therefore, to obtain true white light, it is preferable to use R (red light) / G (green light) / B (blue light)! And phosphor 3 that emits light of the three primary colors.
- the excitation light source 9 that emits light having a wavelength that can excite the light emitter 3 that emits light of the three primary colors, an excitation light source that emits ultraviolet light on the short wavelength side, which is one of the high-engineering energies, is used. Is desirable.
- the excitation light source 9 in addition to conventional ultraviolet to visible light emission light sources using mercury vapor such as hot cathode tubes and cold cathode tubes, for example, Mercury-less fluorescent tubes using materials with low environmental impact such as xenon gas manufactured and sold by Sanyo Electric and Samsung Electronics, and ultraviolet light manufactured and sold by Nichia Corporation, Toyoda Gosei, Lumilets, Courier, etc. High power LEDs having an emission band over the visible light castle, inorganic Z organic electoluminescence elements, and the like can be suitably used.
- the polarization plane light source obtained by the combination of the optical element 10 and the excitation light source 9 according to the present embodiment has the excitation light incident from the excitation light source 9 and the luminous body 3 excited. Both the generated visible light and the generated visible light are both scattered in the minute region 2 and reflected on the front and back surfaces of the optical element 10 to be transmitted in the optical element 10. For this reason, as shown in FIG. 6, even if the excitation light source 9 is a point light source, visible light is generated by colliding with the light emitter 3 and exciting the light emitter 3 at the point where the excitation light is transmitted. appear.
- the excitation light source that emits ultraviolet light or the excitation light source 9 having a light emission band from ultraviolet light as described above is used, the excitation light itself is not clearly seen with the naked eye. It doesn't look bright. Therefore, as long as the light emitter 3 is uniformly dispersed, the light emission uniformity with respect to the visible light of the polarization plane light source is relatively good.
- the excitation light source 9 is an excitation light source that emits ultraviolet light
- the translucent resin 1 and the minute region 2 do not substantially absorb ultraviolet light, and the material strength is increased. I prefer that.
- the translucent resin 1 does not substantially absorb the light of the excitation light wavelength.
- the material that does not substantially absorb the light of the excitation light wavelength is used. If so, it is possible to arbitrarily select an inorganic material, an organic material, or a mixture thereof in accordance with the emission wavelength of the excitation light source 9 which may adopt a different one.
- ultraviolet light for example, polyolefin having a cyclo or norbornene structure can be used.
- the covering material should satisfy the refractive index relationship with the translucent resin 1.
- any material such as an inorganic material that does not substantially absorb light having an excitation light wavelength, an organic material, or a mixture thereof may be used.
- an excitation light source that emits ultraviolet light for example, strontium carbonate, lithium niobium trioxide, calcium carbonate, calcium sulfate 'dihydrate, phosphoric acid lithium, diacid
- an inorganic compound crystal having anisotropy in the crystal structure such as a quackene.
- the optical element 10 according to the present embodiment can be formed as a single layer or can be formed as two or more layers overlapped. By superimposing the optical element 10, a synergistic scattering effect more than the increase in thickness can be exhibited. Such a superposed body is preferably superposed so that the ⁇ direction is in a parallel relationship in each layer from the viewpoint of increasing the scattering effect.
- the number of overlapping may be an appropriate number of two or more layers.
- the optical element 10 to be superimposed may have the same ⁇ 1, ⁇ 2 and ⁇ 3, or may be different. Further, the luminescent material 3 included in each optical element 10 may be the same material or a different material. Note that the parallel relationship in each layer with respect to the ⁇ direction and the like is preferably parallel to each other as described above, but a deviation due to an operation error is allowed. Also, there is variation in the ⁇ direction etc. within each optical element 10. In some cases, it is preferable to superimpose such that the average direction is parallel.
- the superposed body of the optical element 10 and the excitation light source, the support, the light guide plate, etc., and the superposed body of the optical elements 10 are bonded via an adhesive layer or the like so that the total reflection interface is the outermost surface. Is formed.
- an appropriate adhesive such as a hot melt system or an adhesive system can be used. It is preferable to use an adhesive layer that has a small refractive index difference with respect to the optical element 10 in terms of suppressing reflection loss. It is also possible.
- an appropriate adhesive such as an acrylic, silicone-based, polyester-based, polyurethane-based, polyether-based, or rubber-based transparent adhesive can be used, and there is no particular limitation.
- those that require a high-temperature process for curing or drying, or those that do not require long-time curing or drying treatment are preferred. Also preferred are those that do not cause peeling or peeling phenomena under heating or humidification conditions.
- an alkyl ester of (meth) acrylic acid having an alkyl group having 20 or less carbon atoms such as a methyl group, an ethyl group, or a butyl group, and (meth) acrylic acid or hydroxymethyl (meth) acrylate is an alkyl ester of (meth) acrylic acid having an alkyl group having 20 or less carbon atoms such as a methyl group, an ethyl group, or a butyl group, and (meth) acrylic acid or hydroxymethyl (meth) acrylate.
- An acrylic pressure-sensitive adhesive based on an acrylic polymer having a weight average molecular weight of 100,000 or more, copolymerized with an acrylic monomer that also has improved component power such as a glass transition temperature of 0 ° C or less, etc. Is preferably used as an adhesive.
- Acrylic adhesives also have the advantage of being excellent in transparency, weather resistance, heat resistance and the like.
- the attachment of the adhesive layer to the optical element 10 can be performed by an appropriate method. Specifically, for example, an adhesive component is dissolved or dispersed in an appropriate solvent alone or a mixture of solvents such as toluene and ethyl acetate to prepare an adhesive solution of about 10 to 40% by weight. Is attached directly on the optical element 10 by an appropriate spreading method such as a casting method or a coating method, or an adhesive layer is formed on the separator in accordance with this method, and this is applied to the optical element 10. The method of transfer is mentioned. Note that the attached adhesive layer can be an overlapping layer of different compositions and types.
- the thickness of the adhesive layer can be appropriately determined according to the adhesive strength and the like, and is generally 1 to 500 / zm.
- the adhesive layer for example, natural or synthetic oils, glass fibers, glass beads, metal powders, other inorganic powders, and other fillers, pigments, colorants, and antioxidants are used. It is also possible to mix appropriate additives such as a stopper.
- the light-transmitting sheet 4 having excellent smoothness is attached to the optical element 10 through the adhesive layer 8 as described above, and the attachment is performed.
- the smooth surface (upper surface) of translucent sheet 4 is the total reflection interface! /
- the optical element 10 Since the optical element 10 needs to be appropriately depolarized in the process of transmitting light through the optical element 10, the optical element 10 has a phase difference as a whole or in part. It is preferable to configure. Basically, the slow axis (axis in the ⁇ direction) of the optical element 10 and the polarization axis (vibration plane) of linearly polarized light that is not easily scattered are orthogonal to each other, so that polarization conversion due to the phase difference occurs. Although it is difficult, the apparent angle changes due to slight scattering and polarization conversion is considered to occur.
- the optical element 10 has an in-plane retardation of 5 nm or more from the viewpoint of causing such polarization conversion, but the value varies depending on the thickness of the optical element 10.
- the preferable upper limit value of the in-plane retardation of the optical element is also not uniquely determined because it depends on its thickness.
- Such retardation is not limited to the method of containing birefringent fine particles in the optical element 10, the method of attaching it to the surface, the method of making the translucent resin 1 birefringent, and the method of using them together. It can be applied by an appropriate method such as a method of integrally laminating a birefringent film.
- the reflective layer 5 is disposed on the back surface (lower surface) side of the optical element 10, and the polarization state of the light that is also emitted from the back surface force of the optical element 10 is changed via the reflective layer 5. It is possible to improve the brightness by inverting the light and concentrating the emitted light on the surface of the optical element 10.
- the reflective layer 5 is preferably a mirror surface from the viewpoint of maintaining the polarization state. Therefore, the reflective layer 5 is preferably a reflective surface made of a metal or a dielectric multilayer film.
- a metal for example, an appropriate metal such as aluminum, silver, chromium, gold, copper, tin, zinc, indium, no ⁇ radium, platinum, or an alloy thereof can be used.
- the reflective layer 5 is in direct contact with the optical element 10 as an attached layer of a metal thin film by vapor deposition or the like.
- complete reflection is difficult, and some absorption by the reflection layer 5 occurs. Therefore, considering the fact that total reflection is repeated in the light transmitted through the optical element 10, there is a concern about absorption loss due to the reflective layer 5 if it is directly adhered, so that an optical element that prevents this is expected. It is preferable that 10 and the reflective layer 5 are simply placed in an overlapping manner (that is, an air layer is interposed between them).
- the reflective layer 5 it is preferable to use a plate-like material such as a reflective plate in which a metal thin film is attached to a support substrate by sputtering, vapor deposition, or the like, or a metal foil or a metal rolled sheet.
- a plate-like material such as a reflective plate in which a metal thin film is attached to a support substrate by sputtering, vapor deposition, or the like, or a metal foil or a metal rolled sheet.
- the supporting substrate an appropriate material such as a glass sheet or a resin sheet can be used.
- the reflective layer 5 is preferably made by depositing silver or the like on a resin sheet from the viewpoints of reflectance, color and handling.
- the reflective layer 5 made of a dielectric multilayer film for example, a film described in JP-T-10-511322 can be used as appropriate.
- the surface and side surfaces of the optical element 10 In addition to the arrangement of the reflective layer 5 on the back surface of the optical element 10 as shown in FIG. 4, the surface and side surfaces of the optical element 10, and the front and back surfaces and side surfaces thereof when a light guide plate is disposed. If necessary, place it in an appropriate place.
- a polarization maintaining lens sheet 7 is provided on the light extraction surface side (upper surface side) of the optical element 10.
- the light diffusing layer 6 can be disposed, and a wavelength cut filter (not shown), a retardation film (not shown), and the like can be appropriately disposed.
- the lens sheet 7 controls the optical path of the light emitted from the optical element 10 (linearly polarized light) while maintaining the degree of polarization, improves the directivity in the front direction, which is advantageous for visual recognition, and has a scattering property.
- the purpose is to set the intensity peak of the emitted light in the front direction.
- the lens sheet 7 As the lens sheet 7, the light path of the scattered light incident from one surface (back surface) is controlled, and the lens sheet 7 can be appropriately emitted from the other surface (front surface) in a direction perpendicular to the sheet surface (front direction).
- any lens sheet having various lens forms used in a conventional so-called sidelight type light guide plate as described in, for example, Japanese Patent Application Laid-Open No. 5-169015 is used except for the polarization maintaining property. be able to.
- the lens sheet 7 is, for example, preferably 80% or more, more preferably 85% or more. Preferably, it exhibits a total light transmittance of 90% or more, and when arranged between cross-cols, the transmittance power of leakage light due to depolarization is preferably 5% or less, more preferably 2% or less, particularly preferably It is preferable to use one that is excellent in light transmittance, such as 1% or less, and that does not cancel the polarization characteristics of the emitted light.
- the lens sheet 7 exhibiting polarization maintaining properties can reduce, for example, birefringence or average reflection of light transmitted inside ( This can be achieved by reducing the number of scattering).
- a cellulose triacetate-based resin, a polymethyl methacrylate methyl ester, a polycarbonate, a norbornene-based resin exemplified as the polymer used in the optical element 10 described above a resin having a small birefringence ( A lens sheet 7 exhibiting polarization maintaining property can be prepared by using one or two or more types of resins having good optical isotropy.
- Examples of the lens sheet 7 include a convex lens type in which a refractive index is controlled via a photopolymer or the like on the surface or inside of a transparent resin base material that may contain a resin having a different refractive index.
- Refractive index distribution type (GI type) lens regions (especially minute lens regions) formed in large numbers, and many through-holes provided in a transparent resin base material filled with polymers having different refractive indexes. It is possible to have an appropriate lens configuration, such as a lens having a spherical region, or a single spherical layer in which a large number of spherical lenses are arranged and fixed with a thin film.
- the lens sheet 7 has a lens form 71 having an uneven structure force as shown in FIG.
- the concavo-convex structure forming such a lens form 71 may be any structure that exhibits a function of controlling the optical path of light transmitted through the lens sheet 7 and condensing the transmitted light in the front direction.
- the linear or dotted uneven structure may be a spherical lens, an aspheric lens, a semi-cylindrical lens, or the like.
- the lens sheet 7 having a linear or dotted concavo-convex structure is necessary, for example, by filling a mold formed so as to form a predetermined concavo-convex structure with a monomer for forming a resin solution or a resin.
- a suitable method such as a method of transferring the concavo-convex structure of the mold by polymerization treatment or a method of transferring the concavo-convex structure by heat-pressing a resin sheet to the mold.
- the lens sheet 7 may be formed as a superposed layer of two or more of the same or different types of resin layers, like a support sheet with a lens shape attached.
- the lens sheet 7 can be arranged in one layer or two or more layers on the light emitting side of the optical element 10. When two or more layers are arranged, each lens sheet 7 may be the same or different, but it is preferable to maintain the polarization maintaining property as a whole.
- the lens sheet 7 is disposed adjacent to the optical element 10, as in the case of the reflection layer 5 described above, an air layer is interposed between the optical element 10 and the optical element 10, so that an air layer is interposed therebetween. It is preferable to arrange them. Further, the gap is preferably sufficiently larger than the wavelength of incident light from the point of total reflection.
- the line direction is the optical axis direction of the optical element 10 (vibration of outgoing polarization) from the viewpoint of optical path control in the front direction. It is preferable to arrange so as to be in a parallel state or an orthogonal state to the (plane direction). When two or more lens sheets 7 are arranged, it is preferable to arrange them so that the line directions intersect at the upper and lower layers from the viewpoint of the efficiency of optical path control.
- the light diffusing layer 6 diffuses while maintaining the degree of polarization of the light emitted from the optical element 10 to make the light emission uniform, or relieves the uneven structure of the lens sheet 7 from being visualized.
- the purpose is to improve visibility.
- the light diffusing layer 6 it is preferable to use a layer that is excellent in light transmittance and maintains the polarization characteristics of the emitted light, as with the lens sheet 7 described above. Therefore, it is preferable to form the light diffusion layer 6 using a low birefringence! / Wax such as exemplified in the lens sheet 7. For example, transparent particles are dispersed in the sebum.
- the light diffusing layer 6 exhibiting polarization maintaining property can be formed by, for example, containing it or forming a resin layer having a fine concavo-convex structure on the surface.
- the transparent particles to be dispersed and contained in the above-mentioned resin include, for example, silica, glass, anolemina, titanium, zirconium oxide, tin oxide, indium oxide, acid cadmium, antimony oxide and the like.
- Inorganic fine particles or acrylic polymers that may have conductivity 1.Polyacrylonitrile, polyester, epoxy resin, melamine resin, urethane resin, polycarbonate, polystyrene, silicone resin, benzoguanamine, melamine, benzoguanamine condensate, benzoguanamine / formaldehyde condensate Examples include uncrosslinked polymer isotonic organic fine particles.
- the transparent particles one kind or two or more kinds can be used, and the particle diameter thereof is 1 to 20 / ⁇ ⁇ in view of light diffusibility and uniformity of diffusion. It is preferable to do this.
- the particle shape is arbitrary, (true) spherical shape and its secondary aggregate are generally used.
- transparent particles having a refractive index ratio of 0.9 to 1.1 with rosin.
- the transparent particle-containing light diffusion layer 6 described above includes, for example, a method in which transparent particles are mixed with a molten resin resin and extruded into a sheet or the like, and transparent particles are disposed in a resin solution or monomer. It is formed by a known appropriate method such as a method of casting on a combination sheet and performing a polymerization treatment if necessary, or a method of coating a resin solution containing transparent particles on a predetermined surface or a polarization maintaining support film. Can do.
- the light diffusing layer 6 having a fine concavo-convex structure on the surface is a method for roughening the surface of a sheet made of resin, for example, by puffing using sandblasting or embossing, etc. It can be formed by an appropriate method such as a method of forming a layer of a light-transmitting material having protrusions on the surface.
- a method of forming irregularities (protrusions) having a large refractive index difference from a resin such as air bubbles or acid titanium fine particles is not preferable because polarization can be easily eliminated.
- the fine concavo-convex structure on the surface of the light diffusing layer 6 has a surface roughness not less than the wavelength of incident light and not more than 100 m in terms of periodicity due to light diffusivity and uniformity of diffusion. None What consists of unevenness is preferred.
- the light diffusing layer 6 can be arranged as an independent layer made of a plate-like material or the like, and can also be arranged as a subordinate layer in close contact with the lens sheet 7. Position of light diffusion layer 6 When the device is adjacent to the optical element 10, it is preferable to dispose it so that a gap is formed between the optical element 10 and the lens sheet 7. When two or more light diffusing layers 6 are arranged, each light diffusing layer 6 may be the same or different. It is preferable to maintain the polarization maintaining property as a whole.
- the wavelength cut filter 1 described above is used for the purpose of preventing direct light from the excitation light source 9 from entering a liquid crystal display element or the like illuminated by the polarization plane light source according to the present embodiment.
- the excitation light is ultraviolet light
- a wavelength cut filter is preferably used because it is necessary to prevent deterioration of the liquid crystal and the polarizing plate due to the ultraviolet light.
- the wavelength cut filter 1 can also be used for the purpose of eliminating visible light having an unnecessary wavelength.
- Examples of the wavelength cut filter include, for example, a material that absorbs a target wavelength in a resin having translucency to visible light (a salicylic acid ester compound, a benzophenol compound, a benzotriazole compound).
- a film in which a UV absorber such as a cyanoacrylate compound or nickel complex compound is dispersed or coated a film in which a cholesteric liquid crystal is laid on a translucent film, or a reflection of a dielectric multilayer film Depending on the case, it may be one that reflects light of the desired wavelength.
- an ultraviolet absorber may be added to the optical element 10 or other optical member to provide a wavelength cut function.
- the retardation film described above is used for the purpose of converting linearly polarized light emitted from the optical element 10 into an arbitrary polarization state.
- a 1Z4 wave plate as a retardation film is arranged at an angle of 45 ° with the linearly polarized light emitted in the slow axis direction and converted into circularly polarized light, or a 1Z2 wave plate as a retardation film.
- the retardation film is made of a polymer film that is generally used for compensation of a liquid crystal cell, or a film in which a liquid crystal polymer is oriented and laid on a translucent film. Things can be used.
- the lens sheet 7, the light diffusing layer 6, the wavelength cut filter, and the like described above can be used as a single layer or stacked layers. Further, it can be adhered to an upper liquid crystal display element or the like via an adhesive layer or the like. However, it has the uneven structure described above In the case of the lens sheet 7 and the light diffusing layer 6 having a fine surface irregularity, an arrangement with a gap between the liquid crystal display element is preferred.
- the lens sheet 7, the light diffusion layer 6, the wavelength cut filter, and the like should not interfere with the control of the critical angle condition in the optical element 10 from the viewpoint of efficiently extracting polarized light. It is preferable that the optical element 10 is disposed with a gap.
- the optical element 10 according to the present embodiment described above and the polarization plane light source to which the element is applied can emit light from the optical element 10 as linearly polarized light using light incident from the excitation light source 9. Since the polarization direction (vibration plane) can be controlled, it can be suitably used for various devices and applications that use linearly polarized light such as a liquid crystal display device.
- Poval PVA124 polymerization degree 2400 made from Kurarene as translucent resin, liquid crystal monomer UCL008 made by Dainippon Ink & Chemicals, Ltd. A dispersion (20% by weight or equivalent) of ZnS nanoparticles (particle size 2 to 4 nm) manufactured by KK was used. Furthermore, MegaFac, which is a fluorine leveling agent manufactured by Dainippon Ink and Chemicals, was used as the leveling agent.
- the above polybulal alcohol was dissolved in hot water to prepare a 13% by weight aqueous solution.
- PVA aqueous solution polyvinyl alcohol aqueous solution
- 15% by weight of glycerin was added to the solid content.
- 2.9 g of the above liquid crystal monomer, 0.014 g of the above leveling agent, and 2.9 g of the above phosphor (solid content) were mixed and stirred until heated to an isotropic phase. did.
- 450 g of the above PVA aqueous solution was heated to 90 ° C., added, and mixed. Mixing was performed at 6000 rpm ⁇ 20 minutes using a homomixer. The resulting mixture was kept at 35 ° C for 24 hours, free of air bubbles! A nyl alcohol solution was obtained.
- the polybulal alcohol solution was applied with a wet thickness of 1 mm using an applicator, and a dry substrate was obtained under drying conditions of 110 ° C. for 20 minutes and annealing conditions of 140 ° C. for 4 minutes.
- the dried substrate was stretched 4 times in an aqueous boric acid solution (4 wt%, 60 ° C) to produce an optical element.
- the optical element had a refractive index difference ⁇ of 0.15 and ⁇ 2 and ⁇ 3 forces of 0.01 respectively.
- ⁇ refractive index difference
- polyvinyl alcohol alone was subjected to a stretching treatment under the same conditions as above, and the liquid crystal monomer alone was applied onto the alignment film and aligned and fixed.
- the refractive index was measured with an Abbe refractometer, and the difference between them was calculated as ⁇ 1, ⁇ 2, and ⁇ 3.
- the luminescent material was mainly dispersed in polyvinyl alcohol.
- the length in the major axis direction was about 5 ⁇ m and the length in the minor axis direction was about 1. It was 5 ⁇ m.
- An optical element was produced according to Example 1 except that the polyvinyl alcohol solution was applied with a wet thickness of 2 mm and the dried substrate was stretched 5 times.
- Norbornene-based resin as translucent resin CFSR, Arton, glass transition temperature 182 ° C) 94 parts (parts by weight, the same shall apply hereinafter), 5 parts of strontium carbonate as a material for producing microregions, phosphor ZnS nanoparticles as a product (manufactured by Sumitomo Osaka Cement Co., Ltd., excitation wavelength: 345 nm, emission wavelength: 580 nm)
- After forming a film by casting with a 25 wt% toluene solution in which 1 part was dissolved, from 50 ° C to 120 ° C The temperature was raised with a constant gradient and dried for 1-2 hours. Thereafter, the optical element having a thickness of 80 m was produced by stretching twice at 170 ° C.
- Example 3 An optical element was fabricated in accordance with Example 3 except that zirconia dioxide was used instead of strontium carbonate.
- Table 1 shows the light absorption wavelengths of the respective materials used for manufacturing the optical elements according to Examples 3 and 4.
- the numerical values described in the columns of translucent resin and minute region mean the light absorption wavelength band.
- the numerical value described in the column of a light-emitting body means an excitation wavelength.
- the numerical value described in the column of the excitation light source means the center wavelength of the emitted light.
- Example 3 instead of the strontium carbonate used in Example 3, as a material for producing the microscopic area, a material that absorbs a relatively large amount of light having an excitation light wavelength (specifically, a liquid crystal polymer (glass An optical element was produced according to Example 3 except that the transition temperature was 70 ° C and the nematic liquid crystal formation temperature was 190 ° C). Table 1 shows the light absorption wavelength of each material used for the production of the optical element according to this reference example.
- a liquid crystal polymer glass
- Table 1 shows the light absorption wavelength of each material used for the production of the optical element according to this reference example.
- An optical element was prepared according to Example 1 except that ZnS manufactured by Wako Pure Chemical Industries, Ltd. was pulverized with a homogenizer as the illuminant and the average particle size was 1 ⁇ m and the maximum particle size was 10 m. It was.
- Norbornene-based resin JSR, Arton, glass transition temperature 182 ° C 950 parts (parts by weight, the same shall apply hereinafter), liquid crystal polymer represented by the following chemical formula (glass transition temperature 80 ° C, nematic liquid crystal temperature 100 to 290 ° C) 50 parts of 3- (2-benzothiazolyl) 7 Jechiruamino (coumarin 540) forming a film having a thickness of 100 mu m by a casting method using a 20 weight were dissolved 2 parts 0/0 dichloromethane solution Then, it was stretched 3 times at 180 ° C and then rapidly cooled to produce an optical element.
- liquid crystal polymer represented by the following chemical formula (glass transition temperature 80 ° C, nematic liquid crystal temperature 100 to 290 ° C) 50 parts of 3- (2-benzothiazolyl) 7 Jechiruamino (coumarin 540) forming a film having a thickness of 100 mu m by a casting method using a 20 weight were dissolved 2 parts 0
- a liquid crystal polymer is dispersed in a domain shape having almost the same shape in the state of being elongated in the extending direction in a transparent film made of norbornene-based resin, and the refractive index difference ⁇ nl force. 23, ⁇ 2 and ⁇ 3 forces were 0.029 respectively.
- norbornene-based resin alone was stretched under the same conditions as described above, and the liquid crystal polymer was applied alone on the alignment film and aligned and fixed.
- Refractive indices were measured by Abbe refractometers, respectively, and the difference between them was calculated as ⁇ 1, ⁇ 2, and ⁇ 3.
- a silver terephthalate sheet and a silver terephthalate sheet are formed on the surface opposite to the bonding surface of the glass plate.
- a mirror-reflective sheet subjected to vapor deposition was arranged, and a polarized light source was formed by fixing a black light fluorescent lamp cold-cathode tube on one side of the laminated body with a lamp reflector made of the specular reflection sheet.
- Example 2 and Comparative Example 2 were strong enough to cause breakage or poor appearance during the production.
- the optical element of Comparative Example 1 had a poor appearance such that large phosphor particles protruded from the surface during the film formation to form fine irregularities. Furthermore, cracks were generated starting from the large phosphor particles that protruded from the surface during stretching.
- Example 2 and Comparative Example 1 As an excitation light source for making excitation light incident on the optical element of Example 2 and Comparative Example 1, a UV light-emitting LED (NSHU590A) manufactured by Nichia Kagaku Kogyo Co., Ltd., which is a point light source, was used and ultraviolet light was emitted at 15 mA. Light was emitted and made incident on each optical element.
- NSU590A UV light-emitting LED
- the polarization plane light source of Comparative Example 2 has a component that the linearly polarized light in the ⁇ direction of the optical element emits light in a planar shape.
- the polarization plane light source of Comparative Example 2 has a heating reliability test. At 90 ° CX for 24 hours, coumarin deteriorated and the emission luminance decreased significantly.
- optical elements of Examples 3 and 4 were evaluated for visual color reproducibility, material deterioration due to ultraviolet light absorption, and luminous efficiency.
- the optical elements according to Examples 3 and 4 and the reference example were emitted using the ultraviolet LED described above, the optical elements according to Examples 3 and 4 emitted light compared to the optical element according to the reference example. It was confirmed that the efficiency was about 40% higher.
- the ultraviolet LED was used as an excitation light source.
- the emission intensity of each linearly polarized light component in the ⁇ nl direction and ⁇ n2 direction of the emitted light was measured, for the optical elements according to Examples 3 and 4, linearly polarized light with a ratio of 5: 1 was emitted.
- the optical element according to the reference example emitted linearly polarized light at a ratio of approximately 1: 1. In the case of the optical element according to the reference example, this is considered to be because the liquid crystal which is the minute region portion deteriorates and the anisotropy of the liquid crystal disappears in the ultraviolet irradiation test.
- light excited and emitted through incident light can be emitted as linearly polarized light having a sufficient degree of polarization at least one of the front and back surfaces, and can be easily manufactured without causing appearance defects.
- An optical element capable of easily increasing the luminance of emitted light, a polarization plane light source using the optical element, and a display device using the optical element can be provided.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal (AREA)
- Polarising Elements (AREA)
- Planar Illumination Modules (AREA)
- Optical Elements Other Than Lenses (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/664,216 US20080049317A1 (en) | 2004-09-30 | 2005-09-28 | Optical Element, Polarization Plane Light Source Using the Optical Element, and Display Device Using the Polarization Plane Light Source |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004288122 | 2004-09-30 | ||
JP2004-288122 | 2004-09-30 | ||
JP2005-122721 | 2005-04-20 | ||
JP2005122721A JP4618721B2 (ja) | 2004-09-30 | 2005-04-20 | 光学素子及びこれを用いた偏光面光源並びにこれを用いた表示装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006035837A1 true WO2006035837A1 (ja) | 2006-04-06 |
Family
ID=36118983
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/017886 WO2006035837A1 (ja) | 2004-09-30 | 2005-09-28 | 光学素子及びこれを用いた偏光面光源並びにこれを用いた表示装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20080049317A1 (ja) |
JP (1) | JP4618721B2 (ja) |
TW (1) | TWI292493B (ja) |
WO (1) | WO2006035837A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008112154A (ja) * | 2006-10-04 | 2008-05-15 | Sharp Corp | ディスプレイ |
JP2010509735A (ja) * | 2006-11-13 | 2010-03-25 | リサーチ・トライアングル・インスティチュート | 発光デバイス |
WO2023100946A1 (ja) * | 2021-11-30 | 2023-06-08 | 国立大学法人京都大学 | 円偏光素子及びそれを用いた照明装置 |
Families Citing this family (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080192458A1 (en) * | 2007-02-12 | 2008-08-14 | Intematix Corporation | Light emitting diode lighting system |
TWI412792B (zh) * | 2007-04-30 | 2013-10-21 | Taiwan Tft Lcd Ass | 液晶顯示裝置 |
WO2009060978A1 (ja) * | 2007-11-08 | 2009-05-14 | Teijin Dupont Films Japan Limited | 積層フィルム |
WO2009080741A2 (en) | 2007-12-21 | 2009-07-02 | Agc Flat Glass Europe Sa | Solar energy reflector |
US8807799B2 (en) | 2010-06-11 | 2014-08-19 | Intematix Corporation | LED-based lamps |
JP5275305B2 (ja) * | 2010-09-06 | 2013-08-28 | 株式会社東芝 | 発光体および発光装置 |
EP2678736B1 (en) * | 2011-02-25 | 2015-01-21 | 3M Innovative Properties Company | Variable index light extraction layer for use in a front-lit reflective display device |
JP6261858B2 (ja) * | 2012-06-28 | 2018-01-17 | 日東電工株式会社 | 画像表示装置、防眩性フィルムおよび防眩性フィルムの製造方法 |
KR101930960B1 (ko) * | 2012-08-09 | 2018-12-19 | 도레이케미칼 주식회사 | 일체형 광학필름 |
KR101930550B1 (ko) * | 2012-08-09 | 2018-12-18 | 도레이케미칼 주식회사 | 중합체가 분산된 반사형 편광자 |
KR101930553B1 (ko) * | 2012-08-09 | 2019-03-11 | 도레이케미칼 주식회사 | 일체형 고휘도 편광필름 |
KR101940321B1 (ko) * | 2012-08-09 | 2019-01-18 | 도레이케미칼 주식회사 | 다층 반사형 편광자 |
KR101930551B1 (ko) * | 2012-08-09 | 2018-12-18 | 도레이케미칼 주식회사 | 중합체가 분산된 반사형 편광자 |
ITMI20130921A1 (it) * | 2013-06-05 | 2014-12-06 | Itaca Nova S R L | Dispositivo di illuminazione avente forma di lastra con fosfori e diffusori. |
ITMI20130922A1 (it) * | 2013-06-05 | 2014-12-06 | Itaca Nova S R L | Dispositivo di lancio della luce in dispositivo di illuminazione avente forma di lastra. |
CN103941321B (zh) * | 2013-06-20 | 2017-08-01 | 厦门天马微电子有限公司 | 光学膜及液晶显示器 |
CN106133591A (zh) | 2014-04-02 | 2016-11-16 | 耶路撒冷希伯来大学伊森姆研究发展公司 | 偏振光源器件 |
JP6339053B2 (ja) * | 2014-09-30 | 2018-06-06 | 富士フイルム株式会社 | 波長変換部材及びそれを備えたバックライトユニット、液晶表示装置 |
WO2016051760A1 (ja) * | 2014-09-30 | 2016-04-07 | 富士フイルム株式会社 | 波長変換部材及びそれを備えたバックライトユニット、液晶表示装置 |
US20170052404A1 (en) * | 2015-08-18 | 2017-02-23 | Samsung Electronics Co., Ltd. | Display panel and display apparatus using the same |
CN105891936B (zh) * | 2016-05-20 | 2019-11-01 | 京东方科技集团股份有限公司 | 导光元件及其制作方法以及背光模组 |
US10411222B2 (en) * | 2017-05-23 | 2019-09-10 | University Of Maryland, College Park | Transparent hybrid substrates, devices employing such substrates, and methods for fabrication and use thereof |
KR101854439B1 (ko) * | 2017-11-30 | 2018-06-08 | 유한회사 드림티앤아이 | 축광성 야간 안전 유도 장치 및 이의 제조방법 |
CN108803126B (zh) * | 2018-06-29 | 2021-01-15 | 京东方科技集团股份有限公司 | 显示面板及其制造方法、显示装置 |
CN109581579B (zh) * | 2019-01-31 | 2021-03-05 | 京东方科技集团股份有限公司 | 一种导光板及其制作方法,以及背光模组和显示面板 |
EP4349921A1 (en) * | 2021-05-31 | 2024-04-10 | Zeon Corporation | Resin composition and optical element |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004205953A (ja) * | 2002-12-26 | 2004-07-22 | Nitto Denko Corp | 光学素子及びこれを用いた偏光面光源並びにこれを用いた表示装置 |
JP2004207136A (ja) * | 2002-12-26 | 2004-07-22 | Nitto Denko Corp | 面光源及びこれを用いた表示装置 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW595012B (en) * | 2001-09-03 | 2004-06-21 | Matsushita Electric Ind Co Ltd | Semiconductor light-emitting device, light-emitting apparatus and manufacturing method of semiconductor light-emitting device |
JP3724801B2 (ja) * | 2002-10-08 | 2005-12-07 | 日東電工株式会社 | 偏光子、光学フィルムおよび画像表示装置 |
TW200531315A (en) * | 2004-01-26 | 2005-09-16 | Kyocera Corp | Wavelength converter, light-emitting device, method of producing wavelength converter and method of producing light-emitting device |
-
2005
- 2005-04-20 JP JP2005122721A patent/JP4618721B2/ja not_active Expired - Fee Related
- 2005-09-28 US US11/664,216 patent/US20080049317A1/en not_active Abandoned
- 2005-09-28 WO PCT/JP2005/017886 patent/WO2006035837A1/ja active Application Filing
- 2005-09-30 TW TW094134180A patent/TWI292493B/zh active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004205953A (ja) * | 2002-12-26 | 2004-07-22 | Nitto Denko Corp | 光学素子及びこれを用いた偏光面光源並びにこれを用いた表示装置 |
JP2004207136A (ja) * | 2002-12-26 | 2004-07-22 | Nitto Denko Corp | 面光源及びこれを用いた表示装置 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008112154A (ja) * | 2006-10-04 | 2008-05-15 | Sharp Corp | ディスプレイ |
JP2010509735A (ja) * | 2006-11-13 | 2010-03-25 | リサーチ・トライアングル・インスティチュート | 発光デバイス |
WO2023100946A1 (ja) * | 2021-11-30 | 2023-06-08 | 国立大学法人京都大学 | 円偏光素子及びそれを用いた照明装置 |
Also Published As
Publication number | Publication date |
---|---|
TWI292493B (en) | 2008-01-11 |
TW200617449A (en) | 2006-06-01 |
US20080049317A1 (en) | 2008-02-28 |
JP2006126774A (ja) | 2006-05-18 |
JP4618721B2 (ja) | 2011-01-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4618721B2 (ja) | 光学素子及びこれを用いた偏光面光源並びにこれを用いた表示装置 | |
JP3983166B2 (ja) | 光学素子及びこれを用いた偏光面光源並びにこれを用いた表示装置 | |
JP7323564B2 (ja) | 液晶表示装置及び偏光板 | |
JP4350996B2 (ja) | 有機エレクトロルミネッセンス素子、面光源および表示装置 | |
JP2004207136A (ja) | 面光源及びこれを用いた表示装置 | |
JP6950731B2 (ja) | 液晶表示装置及び偏光板 | |
TWI790203B (zh) | 液晶顯示裝置 | |
JP2023153884A (ja) | 液晶表示装置及び偏光板 | |
JP2021056519A (ja) | 液晶表示装置 | |
JP7347615B2 (ja) | 液晶表示装置及び偏光板 | |
JP6032385B1 (ja) | 液晶表示装置 | |
JP2006251589A (ja) | 光学素子及びこれを用いた偏光面光源並びにこれを用いた表示装置 | |
JP2002243938A (ja) | 光学素子、偏光面光源及び液晶表示装置 | |
JP3422475B2 (ja) | 偏光導光板及び偏光面光源 | |
JP2006267892A (ja) | 光学素子及びこれを用いた偏光面光源並びにこれを用いた表示装置 | |
JP4610356B2 (ja) | 光学素子の製造方法 | |
JP3422474B2 (ja) | 偏光導光板及び偏光面光源 | |
JP3422476B2 (ja) | 偏光導光板及び偏光面光源 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KM KP KR KZ LC LK LR LS LT LU LV LY MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 11664216 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase | ||
WWP | Wipo information: published in national office |
Ref document number: 11664216 Country of ref document: US |