WO2007125803A1 - バックライトに用いられるレンズシート、それを用いたバックライト及び表示装置 - Google Patents
バックライトに用いられるレンズシート、それを用いたバックライト及び表示装置 Download PDFInfo
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- WO2007125803A1 WO2007125803A1 PCT/JP2007/058454 JP2007058454W WO2007125803A1 WO 2007125803 A1 WO2007125803 A1 WO 2007125803A1 JP 2007058454 W JP2007058454 W JP 2007058454W WO 2007125803 A1 WO2007125803 A1 WO 2007125803A1
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- prism
- resin layer
- refractive index
- base film
- lens
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
- G02B5/045—Prism arrays
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0012—Arrays characterised by the manufacturing method
- G02B3/0025—Machining, e.g. grinding, polishing, diamond turning, manufacturing of mould parts
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/005—Arrays characterized by the distribution or form of lenses arranged along a single direction only, e.g. lenticular sheets
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/06—Simple or compound lenses with non-spherical faces with cylindrical or toric faces
-
- 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
-
- 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
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- 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
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
-
- 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
- G02F1/133602—Direct backlight
- G02F1/133604—Direct backlight with lamps
-
- 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
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
Definitions
- the present invention relates to a lens sheet, a backlight using the lens sheet, and a display device. More specifically, the present invention relates to a lens sheet that has a function of improving front luminance and is used for a knocklight, a V, a backlight, and a display device using the lens sheet.
- Display devices typified by liquid crystal displays are required to improve front luminance. For this reason, the backlight used in the display is laid with a lens sheet that collects the light from the surface light source in the front and improves the front brightness.
- a prism sheet as disclosed in Japanese Patent No. 3262230 is generally used.
- a conventional prism sheet 100 includes a plurality of prism strips (hereinafter simply referred to as prisms) PL arranged in parallel with each other on the surface.
- the bending rate of the prism sheet 100 is about 1.5-1.
- Diffuse light R100 from the surface light source is refracted on the PL surface of the prism, and is deflected and emitted to the front.
- the prism sheet 100 improves the front luminance of the display by condensing the diffused light in the front.
- the prism sheet 100 improves the front luminance, it also increases the luminance in the oblique front direction.
- the solid line in Fig. 20 shows the luminance angle distribution of the vertical viewing angle of the prism sheet 100 in which the prisms PL are arranged in the vertical direction (corresponding to the upper and lower directions of the display screen).
- the relative luminance is the force that shows the first peak within ⁇ 30deg of the vertical viewing angle.
- the luminance angle distribution shown by the solid line in FIG. 20 is unnatural.
- Such a side lobe gives the user who looks at the display a strange feeling. Therefore, it is preferable to suppress the emission of light that forms side lobes (hereinafter referred to as side lobe light t) and to suppress the generation of side lobes.
- side lobe light t the emission of light that forms side lobes
- the prism has a triangular cross section
- the prism is easily scratched and particularly easily damaged at the time of manufacture, transportation, and laying on the backlight.
- Such wrinkles tend to become bright spots and dark spots on the display.
- a protective film had to be laid on the prism sheet 100 before being incorporated into the display device.
- An object of the present invention is to provide a lens sheet that can further improve the front luminance with a single sheet.
- Another object of the present invention is to provide a lens sheet capable of suppressing side lobe light emitted in a front oblique direction.
- Another object of the present invention is to provide a lens sheet that does not require a protective film.
- the lens sheet according to the present invention is used for a backlight.
- the lens sheet of the present invention includes a base film, a lenticular lens resin layer, a prism resin layer, and a filling resin layer.
- the lenticular lens resin layer includes a plurality of cylindrical lenses formed on one surface of the base film and arranged in parallel with each other.
- the prism resin layer is formed on the other surface of the base film and includes a plurality of prisms arranged in parallel to each other, and has a refractive index lower than that of the base film.
- the filled resin layer is filled on the surface of the prism sheet resin layer on which the prisms are arranged, and has a refractive index higher than that of the prism resin layer.
- the base film may be a film shape, a sheet shape, or a plate shape.
- incident light rays are condensed stepwise. Since the refractive index of the filled resin layer is higher than the refractive index of the prism resin layer, the diffused light incident on the filled resin layer is refracted on the prism surface and collected on the front surface. Next, the refractive index of the base film is Since the refractive index of the prism resin layer is higher than the refractive index of the prism resin layer, the light beam incident on the base film from the prism resin layer is refracted on the surface of the base film and condensed on the front.
- the lens sheet of the present invention includes the prism and the cylindrical lens, and makes the incident light ray by making the refractive index of the prism resin layer smaller than that of the base film and the filled resin layer. Can be condensed stepwise inside the lens sheet. Therefore, the front brightness can be further improved with one sheet.
- the lens sheet according to the present invention can suppress the occurrence of side lobes.
- the following can be considered as reasons why side lobes can be suppressed.
- the side lobe in the prism sheet is formed by light emitted at a wide angle with respect to the normal line of the prism sheet (hereinafter referred to as side lobe light). Such sidelobe light is transmitted through and emitted from the other side of the light beam totally reflected on one of the surfaces (two sides) of the prism.
- the filled resin layer is filled between the prisms of the prism resin layer. That is, a plurality of prisms are also formed on the surface of the filled resin layer.
- the refractive index of the prism resin layer is smaller than that of the filled resin layer, but larger than the refractive index of air. Therefore, the critical angle is larger on the prism surface on the filled resin layer than on the conventional prism sheet. Therefore, the ratio of total reflection of light rays on the side surface of the prism on the filled resin layer is reduced, and the generation of side lobes is suppressed.
- the lens formed on the surface of the lens sheet of the present invention is only a cylindrical lens. Since the convex surface of the cylindrical lens has a curvature, it is hard to be damaged. Therefore, no protective film is required.
- the parallel direction of the cylindrical lenses intersects with the parallel direction of the prisms, and Preferably, the parallel direction of the cylindrical lenses is orthogonal to the parallel direction of the prisms.
- each of the lenticular lens resin layer and the filled resin layer collects light in different axial directions. Therefore, the front luminance is further improved. Also, the viewing angle in the biaxial direction can be controlled with a single camera. Specifically, with one lens sheet of the present invention, each of the luminance angle distributions in the biaxial direction has a natural orientation distribution in which the luminance decreases gradually as the angle increases with a peak at the front. Can do.
- the lenticular lens resin layer is formed by the following method.
- the surface of the first roll plate having cylindrical lens transfer grooves arranged in the axial direction is filled with ionizing radiation curing resin.
- the filled ionizing radiation cured resin is transferred to one surface of the base film.
- the lenticular lens resin layer is formed by curing by irradiating with ionizing radiation.
- the prism resin layer is formed by the following method.
- the surface of the second roll plate which is arranged in the circumferential direction and has a plurality of prism transfer grooves on the surface having the same cross-sectional shape as the prism, is filled with ionizing radiation curing resin. Then, the filled ionizing radiation cured resin is transferred to the other surface of the base film. After the transfer, a prism resin layer is formed by curing by irradiating with ionizing radiation.
- the filled resin layer is formed by applying a resin to the surface of the formed prism resin layer.
- ionizing radiation is, for example, ultraviolet rays or electron beams.
- the ionizing radiation-cured resin is a resin that cures when irradiated with ionizing radiation.
- the cylindrical lens transfer grooves of the first roll plate are arranged in the circumferential direction, the edges (flange portions) of each transfer groove have an acute angle, so that they were transferred during manufacture. There is a possibility that the ionizing radiation resin is scraped off by these edges. Therefore, the cylindrical lens transfer grooves are arranged in the axial direction, and the prism transfer grooves of the second roll plate are circumferentially arranged. By arranging in the direction, the transferred resin is prevented from being scraped off by the roll plate. [0024] Preferably, the apex angle of the prism is 90 ° or more.
- the apex angle of the prism is less than 90 °
- the apex angle of the prism transfer groove bottom of the second roll plate is also less than 90 °.
- the second ionizing radiation curable resin transferred to the surface of the base resin layer may be scraped off by the edge (flange) of the prism transfer groove. Therefore, the apex angle of the prism is preferably 90 ° or more.
- the parallel arrangement direction of the cylindrical lenses may be the same as the parallel arrangement direction of the prisms. In this case, it is preferable that at least one of the cylindrical lens and the prism extends in a wavy shape in the longitudinal direction.
- a backlight according to the present invention includes the above-described lens sheet for a knocklight.
- the display device according to the present invention includes the backlight.
- a liquid crystal display device according to the present invention includes the above backlight and a liquid crystal panel laid on the knock light.
- FIG. 1 is a perspective view of a display device provided with a lens sheet according to an embodiment of the present invention.
- FIG. 2 is a sectional view taken along line II II in FIG.
- FIG. 3 is a perspective view of a lens sheet according to an embodiment of the present invention.
- FIG. 4 is a cross-sectional view taken along line IV-IV in FIG.
- FIG. 5 is a sectional view taken along line VV in FIG.
- FIG. 6A is a cross-sectional view of another lenticular lens layer different from the lenticular lens layer in FIG.
- FIG. 6B is a cross-sectional view of another lenticular lens layer different from the lenticular lens layer of FIGS. 3 and 6A.
- FIG. 7A is a schematic diagram for explaining a locus of light rays incident on a prism sheet.
- FIG. 7B is a schematic diagram for explaining the locus of light rays incident on the collimating layer in FIG.
- FIG. 7C Model for explaining the locus of light incident on the lenticular lens layer in FIG.
- FIG. 8A is a perspective view of a prism roll plate for manufacturing the lens sheet shown in FIGS. 3 to 5.
- FIG. 8A is a perspective view of a prism roll plate for manufacturing the lens sheet shown in FIGS. 3 to 5.
- FIG. 8B is an enlarged view of a region 51 in FIG. 8A.
- FIG. 9A is a perspective view of a roll plate for a lenticular lens for manufacturing the lens sheet shown in FIGS. 3 to 5.
- FIG. 9B is an enlarged view of region 61 in FIG. 9A.
- FIG. 10 is a cross-sectional view of another lens sheet having a configuration different from that of the lens sheet of FIG.
- FIG. 11 is a top view of another lens sheet having a configuration different from that of FIGS. 3 and 8.
- FIG. 12 is a luminance angle distribution diagram of the lens sheet of Invention Example 1 in the present example.
- FIG. 13 is a luminance angle distribution diagram of the lens sheet of Example 2 of the present invention in the present Example.
- FIG. 14 is a luminance angle distribution diagram of the lens sheet of Invention Example 3 in the present Example.
- FIG. 15 is a luminance angle distribution diagram of the lens sheet of Invention Example 4 in the present Example.
- FIG. 16 is a luminance angle distribution diagram of the lens sheet of Invention Example 5 in the present Example.
- FIG. 17 is a luminance angle distribution diagram of the lens sheet of Invention Example 6 in the present Example.
- FIG. 18 is a perspective view of a conventional prism sheet.
- FIG. 19 is a sectional view taken along line XIX—XIX in FIG.
- FIG. 20 is a luminance angle distribution diagram of the prism sheet shown in FIG.
- display device 1 includes a knocklight 10 and a liquid crystal panel 20 laid in front of knocklight 10.
- the knocklight 10 includes a surface light source 16 that emits diffused light, and a lens sheet 17 laid on the surface light source 16.
- the surface light source 16 includes a housing 11, a plurality of cold cathode tubes 12, and a light diffusing plate 13.
- No The winging 11 is a housing having an opening 110 in the front, and houses the cold cathode tube 12 therein.
- the inner surface of the housing 11 is covered with a reflective film 111.
- the reflection film 111 diffuses and reflects the light emitted from the cold cathode tube 12 to the opening 110.
- the reflective film 111 is, for example, Toray Lumirror (registered trademark) E60L or E60V, and preferably has a diffuse reflectance of 95% or more.
- the plurality of cold cathode fluorescent lamps 12 are arranged in parallel in the vertical direction (y direction in FIG. 1) in front of the rear surface of the housing 11.
- the cold cathode tube 12 is a so-called linear light source extending in the left-right direction (X direction in FIG. 1), for example, a fluorescent tube.
- a plurality of point light sources such as LEDs (Light Emitting Device) may be housed in the browsing 11.
- a linear light source such as a hot cathode tube or an external electrode fluorescent tube may be housed in the housing 11.
- the light diffusing plate 13 is fitted into the opening 110 and is disposed in parallel with the back surface of the housing 11. By fitting the light diffusing plate 13 into the opening 110, the inside of the housing 11 is sealed, so that light from the cold cathode tube 12 can be prevented from leaking out of the housing 11 from places other than the light diffusing plate 13, The light utilization efficiency is improved.
- the light diffusing plate 13 diffuses the light from the cold cathode tube 12 and the light reflected by the reflective film 111 and emits it to the front.
- the light diffusion plate 13 is composed of a transparent base material and a plurality of particles dispersed in the base material. Since the particles dispersed in the base material have a refractive index different from that of the base material in the visible light wavelength range, the light incident on the light diffusion plate 13 is diffusely transmitted.
- the base material of the light diffusing plate 13 is, for example, glass, polyester-based resin, polycarbonate-based resin, polyacrylate-based resin, alicyclic polyolefin-based resin, polystyrene-based resin, or polysalt resin. And other types of resin, such as polyethylene resin, polyvinyl acetate resin, polyether sulfonic acid resin, and triacetyl cellulose resin.
- the light diffusing plate 13 also functions as a support for the lens sheet 17.
- a lens sheet 17 includes a base film 21, a lenticular lens resin layer (hereinafter simply referred to as a lenticular lens layer) 22 formed on one surface 211 of the base film 21, and And a collimate layer 25 formed on the other surface 212 of the base film 21. These are integrally formed.
- the base film 21 is transparent to wavelengths in the visible light region.
- the base film 21 is made of, for example, glass, polyester-based resin, polycarbonate-based resin, polyacrylate-based resin, alicyclic polyolefin-based resin, polystyrene-based resin, polyvinyl chloride-based resin, Consists of resins such as polyvinyl acetate-based resin, polyether sulfonic acid-based resin, and triacetyl cell port-based resin. Both the surfaces 211 and 212 of the base film 21 are flat. Further, the base film 21 may be a film shape, a sheet shape, or a plate shape.
- the lenticular lens layer 22 is formed on the surface 211.
- the lenticular lens layer 22 includes a plurality of cylindrical lenses 220 arranged side by side.
- the cylindrical lens 220 is arranged in parallel in the vertical direction of the screen of the display device 1 (y direction in FIG. 1).
- the cross-sectional shape of the convex surface 221 of the cylindrical lens 220 shown in FIGS. 3 to 5 is an arc, it may be an elliptical arc as shown in FIG. 6A !, and near the edge as shown in FIG. 6B.
- the arc may be a straight line.
- the collimating layer 25 includes a filling resin layer 24 (hereinafter simply referred to as the filling layer 24) and a prism resin layer 23 (hereinafter simply referred to as the prism layer 23).
- the prism layer 23 includes a plurality of prism strips (Liner Prism: hereinafter simply referred to as prisms) 230 formed on the surface 212 of the base film 21 and arranged in parallel with each other.
- Liner Prism hereinafter simply referred to as prisms
- the filling layer 24 is filled on the surface of the prism layer 23 on which the prisms 230 are arranged.
- the portion of the filling layer 24 that is filled between the plurality of prisms 230 constitutes the prism 240. Since the prisms 230 are arranged side by side, the plurality of prisms 240 are also arranged side by side.
- the surface 243 opposite to the surface on which the prisms 240 are arranged is flat.
- the prisms 230 and 240 are juxtaposed in the left-right direction of the screen of the display device 1 (x direction in FIG. 1). Accordingly, the parallel direction of the cylindrical lenses 220 is orthogonal to the parallel direction of the prisms 230 and 240.
- the single lens sheet 17 can adjust the luminance angle distribution in the biaxial directions (vertical direction and horizontal direction in the present embodiment).
- the collimating layer 25 controls the left and right viewing angles, and the luminance decreases as the angle increases from the front to the peak.
- the lenticular lens layer 22 controls the vertical viewing angle to form a natural light distribution in which the luminance decreases as the angle increases with the front as a peak.
- the lenticular lens layer 22, the prism layer 23, and the filling layer 24 are made of resin. More specifically, the lenticular lens layer 22 and the prism layer 23 are made of an ionizing radiation curable resin.
- An ionizing radiation curable resin is a resin that is cured by ionizing radiation such as ultraviolet rays or electron beams.
- the filling layer 24 may be made of an ionizing radiation curable resin, or may be made of another resin such as polycarbonate or polystyrene.
- the refractive index n23 of the prism layer 23 has a relationship of the following formula (1) with the refractive index n24 of the filling layer 24, and has the relationship of the following formula (2) with the refractive index n21 of the base film 21.
- the collimating layer 25 collimates the light incident on the filling layer 24 in the front and emits it to the base film 21. . If the refractive index n24 is increased, the refraction angle of the light beam on the lower surface 243 of the filling layer 24 is increased. The light beam collimated at the lower surface 243 reaches the surface of the prism 240 and collimates further to the front surface. Therefore, the higher the refractive index n24, the more the front luminance is improved.
- a preferable refractive index n24 of the filling layer 24 is 1.5 ⁇ n24 ⁇ l.8. However, even if the refractive index n24 is 1.5 or less, the effect of the present invention can be achieved to some extent if the refractive index n24 is larger than the refractive index n23.
- a preferable refractive index n23 of the prism layer 23 is 1.3 ⁇ ⁇ 23 ⁇ 1.5. However, even if the refractive index n23 is outside the above range, the effects of the present invention can be achieved to some extent if the refractive index n23 satisfies the expressions (1) and (2).
- the refractive index n21 of the base film 21 is larger than the refractive index n23. Therefore, the light condensed in the front by the collimating layer 25 is further collimated in the front when entering the surface 212 of the base film 21. Therefore, the base film 21 contributes to improving the front luminance.
- the lens sheet 17 having the above configuration can suppress the occurrence of side lobes and can further improve the front luminance with a single sheet.
- these effects will be described in detail.
- the lens sheet 17 suppresses the generation of side lobes at the left and right viewing angles by the collimating layer 25, and suppresses the generation of side lobes at the upper and lower viewing angles by the lenticular lens layer 22.
- the collimating layer 25 in the lens sheet 17 can suppress the occurrence of side lobes at the left and right viewing angles.
- the reason why the collimating layer 25 suppresses the side lobes is not necessarily clear. It is presumed that the following matters are mainly caused.
- FIG. 7A among the light rays incident on the prism PL on the conventional prism sheet 100, the light ray R2 is totally reflected by one side BP1 of the prism PL and then transmitted through the other side BP2 and emitted to the outside. This ray R2 forms a side lobe.
- the incident angle ⁇ il of the ray RO is larger than the critical angle ⁇ cl
- the ray RO is totally reflected and propagates in the prism PL as the ray R1.
- ray R1 reaches side BP2
- the collimating layer 25 suppresses the generation of sidelobe light.
- the collimating layer 25 includes a prism layer 23 and a filling layer 24 that satisfy the relationship of the formula (1), and a prism 240 is filled between the plurality of prisms 230.
- the refractive index n24 of the filling layer 24 is the same as the refractive index nlOO of the prism sheet 100.
- the relative refractive index when the light beam enters the prism layer 23 from the filling layer 24 is smaller than the relative refractive index when the light beam enters the air from the prism sheet 100.
- the critical angle ⁇ cO at the surfaces 241 and 2 42 of the prism 240 in the collimating layer 25 is greater than the critical angle ⁇ cl at the surfaces BP1 and BP2 of the prism PL of the prism sheet 100. Also grows. As a result, on the surface of the prism 240, it is considered that the ratio of the light beam RO that is totally reflected decreases, and the emission of the sidelobe light R2 can be suppressed.
- the ray RO incident at the same angle ⁇ 0 as in FIG. 7A reaches the boundary surface BP3 on the convex surface 221 of the cylindrical lens 220.
- the incident angle ⁇ il of the ray RO is larger than the critical angle ⁇ c2
- the ray RO is totally reflected and reaches the boundary surface BP4 on the convex surface.
- the incident angle ⁇ i2 of the light beam RO is often larger than the critical angle ⁇ c2. Therefore, the light beam RO is totally reflected again and returns to the surface light source 16.
- the cylindrical lens 220 In short, in the cylindrical lens 220, the light that has been totally reflected once is more likely to be totally reflected again and return to the surface light source than to be transmitted and then emitted to the outside. Therefore, emission of the side lobe light R2 can be suppressed, and generation of side lobes in the luminance angle distribution can be suppressed.
- the lens sheet 17 the light incident from the lower surface is condensed on the front surface by each of the collimating layer 25, the base film 21, and the lenticular lens layer 22. Therefore, front brightness with one piece Can be improved more.
- the refractive index n24 of the filler layer 24 in the collimating layer 25 is larger than the refractive index n23 of the prism layer 23. Therefore, the collimating layer 25 collects diffused light from the surface light source in the front and emits it to the base film 21.
- the refractive index n21 of the base film 21 is larger than the refractive index n23 of the prism layer 23. Therefore, the light beam incident on the base film 21 from the collimating layer 25 is refracted on the lower surface of the base film 21, further condensed on the front surface, and emitted to the lenticular lens layer 22.
- the lenticular lens layer 22 condenses incident light on the front and emits it to the outside.
- the lens sheet 17 the light beams incident on the collimating layer 25, the base film 21, and the lenticular lens layer 22 are collimated to the front. Therefore, one lens sheet 17 can further improve the front luminance.
- the collimating layer 25 a lenticular lens layer (corresponding to the filling layer 24) having a plurality of cylindrical lenses arranged in parallel with each other, and formed on the lenticular lens layer, the lenticular lens layer
- the collimate layer is composed of a layer having a low refractive index (corresponding to the prism layer 23)
- the light condensing effect in the collimator layer is reduced.
- the lenticular lens sheet has a lower light collecting effect than the prism sheet.
- the condenser lens and the prism array have a lower light collection effect than the prism sheet.
- the prism sheet has the highest light collection effect. Therefore, the collimating layer 25 of the lens sheet 17 is composed of the filling layer 24 in which the prisms 240 are arranged in parallel.
- the collimating layer 25 is formed on the surface 212 of the base film 21.
- a cylindrical first roll having a film-like base film 21 wound on its surface, and a prism roll plate 50 having a transfer groove 52 of the prism 230 on its surface as shown in FIGS. Prepared as a narrative version 50).
- the cross-sectional shape of the transfer groove 52 is the same as the cross-sectional shape of the prism 230, and the cross-section of the ridge 53 corresponding to the edge (flange portion) of the transfer groove 52
- the shape is the same as the cross-sectional shape of the prism 240.
- the transfer grooves 52 are arranged in the circumferential direction.
- the first roll and the roll plate 50 are arranged so that the axial direction of the first roll is parallel to the axial direction of the roll plate 50.
- the surface of the roll plate 50 is filled with ionizing radiation-cured resin having a refractive index n2 3 lower than the refractive index n21 of the base film 21.
- the filled ionizing radiation-cured resin is transferred onto the base film 21 delivered from the first roll.
- the transfer is performed while the base film 21 is sandwiched between the backup roll disposed opposite to the base plate 50 and the roll plate 50 with the base film 21 interposed therebetween.
- the transferred ionizing radiation curable resin is irradiated with ionizing radiation to cure the ionizing radiation curable resin, thereby forming the prism layer 23.
- the filling layer 24 is formed on the prism layer 23.
- a paint is prepared by dissolving a resin having a refractive index n24 higher than the refractive index n23 of the prism layer 23 in a solvent. Apply the prepared paint uniformly on the prism layer 23 using a gravure coater or the like. The applied paint is dried to form a filling layer 24.
- the collimating layer 25 is formed on the surface 212 of the base film 21.
- the base film 21 film on which the collimating layer 25 is formed is wound on the second roll.
- the prisms 230 and 240 are juxtaposed in the circumferential direction of the second roll.
- the lenticular lens layer 22 is formed on the surface 211 of the base film 21.
- transfer grooves 62 of cylindrical lenses 220 arranged in the axial direction are formed on the surface of the roll plate 60.
- the transfer groove 62 of the roll plate 60 is filled with ionizing radiation-cured resin. While the second roll and the stencil plate 60 are rotated, the filled ionizing radiation-cured resin is transferred to the surface 211 of the base film 21 fed from the second roll force. At this time, transfer is performed while the film is sandwiched between backup rolls.
- the transferred ionizing radiation curable resin is irradiated with ionizing radiation and cured to form a lenticular lens layer 22.
- the lens sheet 17 is formed by the above process. In the manufacturing method described above, the collimating layer 25 may be formed first, then the lenticular lens layer 22 may be formed first, the lenticular lens layer 22 may be formed first, and then the collimating layer 25 may be formed.
- the collimating layer 25 it is preferable to form the collimating layer 25 first. If the lenticular lens layer 22 is formed first, the backup roll is pressed against the convex surface of the cylindrical lens 220 of the lenticular lens layer 22 when the prism layer 23 in the collimating layer 25 is formed. For this reason, the cylindrical lens 220 may be deformed in shape.
- the prism transfer grooves 52 may be arranged in directions other than the circumferential direction. They may be arranged in directions other than.
- the manufacturing yield becomes the highest.
- the cylindrical lens transfer grooves 62 are arranged in the axial direction, and the prism transfer grooves 52 are preferably arranged in the circumferential direction. This is because if the cylindrical lens transfer grooves 62 are arranged in the circumferential direction, the roll printing force may cause the grease transferred onto the base film 21 to be scraped off by the edge 621 of the cylindrical lens transfer grooves. .
- the cross-sectional shape of the prism transfer groove 52 is equal to the cross-sectional shape of the prism 230, but the apex angle of the groove bottom of the prism transfer groove 52 (that is, the apex angle of the prism 230) is 90 °. The above is preferable. If the apex angle of the groove bottom is less than 90 °, there is also a force that may cause the grease transferred to the surface 212 of the base film 21 to be scraped off by the ridges 53.
- the filling layer 24 is formed by drying the paint, but the ionizing radiation-cured resin having a refractive index n24 higher than the refractive index n23 is cured by irradiation with ionizing radiation.
- the filling layer 24 may be formed.
- ionizing radiation-cured resin is uniformly coated on the prism layer 23 using a die coater or the like, and the applied ionizing radiation hardened resin is coated. What is necessary is just to irradiate chemical conversion resin with ionizing radiation.
- the manufacturing method by the roll toe roll method using the roll plate has been described as an example of the manufacturing method, but the lens sheet 17 can be manufactured by other manufacturing methods.
- the collimating layer 25 and the lenticular lens layer 22 may be formed using a plate-shaped plate. Further, the lenticular lens layer 22 may be formed by an extrusion method, a heat press method, or a projection formation method.
- the angle (crossing angle) between the parallel arrangement direction of the prisms 230 and 240 and the parallel alignment direction of the cylindrical lens 220 is 90 °, but the crossing angle is not 90 °. May be. If they intersect, the viewing angle in the biaxial direction can be controlled, and a certain degree of light collection effect can be obtained.
- the preferred crossing angle is 45 ° to 135 °, and the most preferred crossing angle is 90 °.
- the direction in which the prisms 230 and 240 are arranged in parallel may be parallel to the direction in which the cylindrical lens 220 is arranged.
- the controlled viewing angle is only in one axial direction, but the front luminance can be improved over the conventional prism sheet, and the generation of sidelobe light can be suppressed.
- the longitudinal direction of the prisms 230 and 240 is not a straight line but an irregular wavy line as shown in FIG.
- the prisms 230 and 240 may be linear and the cylindrical lens 220 may be irregularly wavy in the longitudinal direction, or both the cylindrical lens 220 and the prisms 230 and 240 may be irregularly wavy.
- Moire fringes occur when regular patterns are superimposed. Therefore, the generation of moire fringes can be suppressed by making at least one of the prisms 230 and 240 and the cylindrical lens 220 irregular wavy lines.
- lens sheets can also be manufactured by the same manufacturing method as the lens sheet 17.
- the refractive index n23 of the prism layer 23, the refractive index n24 of the filling layer 24, and the refractive index n21 of the base film 21 satisfy the expressions (1) and (2). Seki By using this, it is possible to improve the front luminance with a single sheet and to suppress the occurrence of side lobes in the luminance angle distribution.
- the top portions thereof are not exposed on the surface.
- the top surface of the cylindrical lens 220 constituting the lenticular lens layer 22 is a curved surface. Therefore, there is no need for a protective sheet for protecting the top of the prism sheet, which is difficult to be damaged during manufacturing and transportation, like the top of the conventional prism sheet.
- the viewing angles in the vertical and horizontal directions on the screen in the liquid crystal display device can be controlled, and
- the luminance angle distribution in each axial direction can be a natural orientation distribution with the front as a peak.
- the two-axis light can be collected in the front by being orthogonal, the front luminance is further improved.
- the term “orthogonal” here does not need to be strictly 90 °, as long as the viewing angle in the vertical and horizontal directions can be controlled and the light collecting effect can be obtained.
- the knocklight 10 may be a direct edge type edge light type.
- each of the plurality of cylindrical lenses 220 is disposed in contact with each other, but a gap may be provided between adjacent cylindrical lenses 220. Similarly, a gap may be provided between adjacent prisms 240. Moreover, although the cross-sectional shape of the prisms 230 and 240 is a triangle, it may be a trapezoid.
- Lens sheets of Invention Examples 1 to 6 having the shapes and refractive indexes n21 to n24 shown in Table 1 were manufactured.
- a prism sheet was manufactured as a comparative example. The luminance angle distributions of the lens sheets and prism sheets of Invention Examples 1 to 6 were examined.
- Example 1 of the present invention having the shape shown in FIGS. 3 to 5 and the prism sheet as a comparative example were manufactured, and the luminance angle distribution was investigated.
- the lens sheet of Invention Example 1 was produced by the following method.
- a prism roll plate having a surface with prism transfer grooves arranged in the circumferential direction was prepared.
- the cross-sectional shape of the prism transfer groove was an isosceles triangle.
- the ultraviolet curable resin transferred by irradiating with ultraviolet rays was cured to form a prism layer 23.
- the cross-sectional shape of the prism 230 on the surface of the prism layer 23 is an isosceles triangle, the apex angle is 90 °, the base is 50 m, and the distance between the apexes of adjacent prisms, that is, the pitch is 50 m.
- the prepared paint was uniformly applied onto the prism layer 23 using a gravure coat.
- the applied paint was dried to form a packed layer 24 with a layer thickness of 30 m.
- the lenticular lens layer 22 was formed on the surface 211 of the base film 21 opposite to the surface on which the collimating layer 25 was formed.
- a roll plate for a lenticular lens having a surface with cylindrical lens transfer grooves arranged in the axial direction was prepared. The cross-sectional shape of the transfer groove was an arc.
- An ultraviolet curable resin having a refractive index of 1.54 was filled in a transfer groove of a roll plate for a lenticular lens, and transferred onto the surface of the PET film.
- the transferred ultraviolet curable resin was cured by irradiating ultraviolet rays to form a lenticular lens layer 22.
- each cylindrical lens 220 on the lenticular lens layer 22 is an arc with a radius of curvature of 20 ⁇ m, the height from the lens edge to the top of the convex surface is 20 ⁇ m, and the surface including the convex surface and the lens edge is The angle formed (hereinafter referred to as the contact angle) was 75 °, and the pitch force of the cylindrical lens 220 adjacent to each other was 0 ⁇ m.
- the prism sheet of the comparative example was prepared by the following method. An ultraviolet curable resin was uniformly coated on a 250 ⁇ m thick PET film with a die coater to form a 30 m thick UV curable resin layer.
- a prism sheet having a shape shown in FIGS. 18 and 19 was produced by irradiating ultraviolet rays while pressing the prism roll plate against the ultraviolet curable resin layer.
- the prism pitch was 50 m and the apex angle was 90 degrees.
- the refractive index of the PET film was 1.6, and the refractive index of the UV curable resin was 1.54.
- Example 1 of the present invention Using the produced lens sheet of Example 1 of the present invention and the prism sheet of the comparative example, the luminance angle distribution was investigated.
- a lens sheet was laid in a housing that accommodated the cold cathode tube, a reflective film was laid on the inner surface, and a light diffusion plate was fitted in the opening. At this time, the lens sheet was laid so that the cylindrical lenses were juxtaposed in the vertical direction and the prisms were juxtaposed in the horizontal direction.
- the luminance angle distribution was examined.
- the viewing angle is defined by taking the normal direction (front) of the lens sheet as the 0 degree axis, the 0 degree axial force as the vertical viewing angle as the vertical tilt angle, and the horizontal tilt angle from the 0 degree axis as the horizontal viewing angle. .
- the luminance at each vertical viewing angle and left / right viewing angle was measured with a luminance meter. The measurement location was the center of the lens sheet.
- FIG. 12 shows the luminance angle distribution of the lens sheet of Example 1 of the present invention
- FIG. 20 shows the luminance angle distribution of the prism sheet as a comparative example.
- the horizontal axis in FIGS. 12 and 20 is the viewing angle (deg)
- the vertical axis is the relative luminance (a.u.) with the luminance of the nosing light diffusing plate as the reference (1.0).
- the solid line in the figure is the luminance angle distribution at the vertical viewing angle
- the dotted line in the figure is the luminance angle distribution at the left and right viewing angles.
- both the vertical viewing angle and the left and right viewing angles have a distribution in which the relative luminance gradually decreases as the viewing angle increases with the viewing angle Odeg as a peak.
- ⁇ s light distribution
- the front luminance of the lens sheet of Example 1 of the present invention was 1.12 times the front luminance of the conventional prism sheet.
- a lens sheet of Invention Example 2 was manufactured, and the luminance angle dependency was investigated in the same manner as in Invention Example 1.
- the cylindrical lens of the lenticular lens layer 22 has a different shape compared to Example 1 of the present invention.
- the cross-sectional shape of each cylindrical lens is an elliptical arc
- the height is 23.7 / ⁇ ⁇
- the apex radius of curvature is 17.3 m
- the contact angle is 70 °
- the pitch between adjacent cylindrical lenses is Was 50 ⁇ m.
- Other configurations were the same as those of the lens sheet of Example 1 of the present invention.
- a lens sheet according to Invention Example 2 was laid on a housing as a surface light source in the same manner as the lens sheet according to Invention Example 1. Specifically, it was laid so that the cylindrical lenses were juxtaposed in the vertical direction and the prisms were juxtaposed in the horizontal direction. After laying, the angular distribution of luminance was investigated as in Example 1.
- Example 2 of the present invention generation of side lobes could be suppressed.
- both the vertical and horizontal viewing angles had a luminance distribution with a peak viewing angle Odeg, resulting in a natural light distribution.
- the front luminance of the lens sheet of Invention Example 2 was 1.15 times that of the conventional prism sheet, which was higher than that of the conventional prism sheet and Invention Example 1. This is probably because the condensing effect in the lenticular lens layer 22 was improved compared to the lens sheet of Example 1 of the present invention in which the cross-sectional shape of the cylindrical lens is an elliptical arc.
- a lens sheet of Invention Example 3 was manufactured, and the luminance angle dependency was examined in the same manner as in Invention Example 1.
- the lens sheet of Inventive Example 3 has different refractive index n23 and refractive index n24 compared to Inventive Example 1. Specifically, the refractive index n23 was made smaller than Example 1 of the present invention (1.3), and the refractive index n24 was made larger than Example 1 of the present invention (1.8). The rest of the configuration was the same as Example 1 of the present invention.
- the front luminance of the lens sheet of Invention Example 3 was 1.30 times the front luminance of the conventional prism sheet, which was higher than that of the conventional prism sheet and Invention Example 1.
- the relative refractive index when light is incident on the prism layer 23 from the filler layer 24 is lower than Example 1 of the present invention, and the relative refractive index when light is incident on the base film 21 from the prism layer 23 is high! Therefore, it is considered that the front luminance was improved over the first invention example.
- a lens sheet of Invention Example 4 was produced, and the luminance angle distribution was adjusted in the same manner as in Invention Example 1.
- the lens sheet of Invention Example 4 had a refractive index n24 lower than that of Invention Example 1.
- Other configurations were the same as those of Example 1 of the present invention.
- Example 4 of the present invention generation of side lobes could be suppressed for both the vertical and horizontal viewing angles.
- both the vertical and horizontal viewing angles provided a natural light distribution with the viewing angle Odeg as a peak.
- the front luminance of the lens sheet of Invention Example 4 was 1.07 times the front luminance of the conventional prism sheet, which was higher than that of the conventional prism sheet. However, it was lower than the front luminance of Invention Example 1. This is presumably because the light condensing effect was lowered in the collimating layer 25 in which the refractive index n24 of the filling layer 24 was lower than that of Example 1 of the present invention.
- the lens sheet of Invention Example 5 was produced by the same production method as that of Invention Example 4. As shown in Table 1, the lens sheet of Invention Example 5 has a refractive index ⁇ 23 higher than that of Invention Example 1 to 1.5. Other configurations were the same as those of Example 1 of the present invention.
- Figure 16 shows the survey results.
- Invention Example 5 both vertical and horizontal viewing angles are The generation of id lobes could be suppressed.
- the luminance distribution with the viewing angle Odeg as the peak was obtained for both the vertical and horizontal viewing angles, resulting in a natural light distribution.
- the front luminance of the lens sheet of Invention Example 5 was 1.05 times the front luminance of the conventional prism sheet, which was higher than that of the conventional prism sheet. However, it was lower than the front luminance of Invention Example 1. This is presumably because the light condensing effect was lowered in the collimating layer 25 having a refractive index n23 higher than that of Invention Example 1.
- the lens sheet of Invention Example 6 was produced by the same production method as that of Invention Example 4. As shown in Table 1, the lens sheet of Invention Example 6 has a refractive index n23 of 1.5, which is higher than that of Invention Example 1. Further, the refractive index n24 was set to 1.6, which was lower than Example 1 of the present invention. Other configurations were the same as those of Example 1 of the present invention. In addition, the cross-sectional shape of the cylindrical lens on the lenticular lens layer 22 was the same elliptical arc shape as in Example 2 of the present invention.
- Figure 17 shows the survey results.
- Example 6 of the present invention generation of side lobes could be suppressed in both the vertical and horizontal viewing angles.
- the luminance distribution with the viewing angle Odeg as the peak was obtained for both the vertical and horizontal viewing angles, resulting in a natural light distribution.
- the front luminance of the lens sheet of Example 6 of the present invention was slightly higher than the front luminance of the conventional prism sheet. However, it was lower than the front luminance of Example 1 of the present invention.
- the refractive index n23 is higher than Example 1 of the present invention, and the refractive index n24 is lower than Example 1 of the present invention.
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- Crystallography & Structural Chemistry (AREA)
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Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/067,281 US7804650B2 (en) | 2006-04-28 | 2007-04-18 | Lens sheet for use in backlight, backlight and display device using the same |
Applications Claiming Priority (2)
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JP2006-126839 | 2006-04-28 | ||
JP2006126839A JP4105736B2 (ja) | 2006-04-28 | 2006-04-28 | レンズシート、それを用いたバックライト及び表示装置 |
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PCT/JP2007/058454 WO2007125803A1 (ja) | 2006-04-28 | 2007-04-18 | バックライトに用いられるレンズシート、それを用いたバックライト及び表示装置 |
Country Status (6)
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US (1) | US7804650B2 (ja) |
JP (1) | JP4105736B2 (ja) |
KR (1) | KR20080111435A (ja) |
CN (1) | CN101346645A (ja) |
TW (1) | TWI434076B (ja) |
WO (1) | WO2007125803A1 (ja) |
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-
2007
- 2007-04-16 TW TW096113367A patent/TWI434076B/zh active
- 2007-04-18 US US12/067,281 patent/US7804650B2/en active Active
- 2007-04-18 WO PCT/JP2007/058454 patent/WO2007125803A1/ja active Application Filing
- 2007-04-18 CN CNA2007800009593A patent/CN101346645A/zh active Pending
- 2007-04-18 KR KR1020087006470A patent/KR20080111435A/ko not_active Application Discontinuation
Patent Citations (3)
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JP3262230B2 (ja) * | 1985-11-21 | 2002-03-04 | ミネソタ マイニング アンド マニュファクチュアリング コンパニー | 光線導管 |
JP2004046076A (ja) * | 2002-03-15 | 2004-02-12 | Mitsubishi Rayon Co Ltd | 光偏向素子及び面光源装置 |
JP2005208600A (ja) * | 2003-12-26 | 2005-08-04 | Nec Corp | 液晶表示装置、その駆動方法及び駆動回路 |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7859612B2 (en) | 2007-11-13 | 2010-12-28 | Lg Display Co., Ltd. | Light concentrating sheet, backlight unit including the light concentrating sheet and liquid crystal display module including the backlight unit |
CN101435955B (zh) * | 2007-11-13 | 2012-01-18 | 乐金显示有限公司 | 集光片、包括集光片的背光单元和包括背光单元的液晶显示模块 |
US11276795B2 (en) | 2010-07-13 | 2022-03-15 | S.V.V. Technology Innovations, Inc. | Light converting systems employing thin light absorbing and light trapping structures with lens arrays |
US11616157B2 (en) | 2010-07-13 | 2023-03-28 | S.V.V. Technology Innovations, Inc. | Method of making light converting systems using thin light absorbing and light trapping structures |
US11923475B2 (en) | 2010-07-13 | 2024-03-05 | S.V.V. Technology Innovations, Inc. | Method of making light converting systems using thin light trapping structures and photoabsorptive films |
USRE49630E1 (en) | 2011-10-08 | 2023-08-29 | S.V.V. Technology Innovations, Inc. | Collimating illumination systems employing a waveguide |
JP2015200832A (ja) * | 2014-04-09 | 2015-11-12 | 富士フイルム株式会社 | 輝度向上膜、偏光板、および画像表示装置 |
Also Published As
Publication number | Publication date |
---|---|
KR20080111435A (ko) | 2008-12-23 |
US20090180191A1 (en) | 2009-07-16 |
US7804650B2 (en) | 2010-09-28 |
CN101346645A (zh) | 2009-01-14 |
JP4105736B2 (ja) | 2008-06-25 |
TW200745623A (en) | 2007-12-16 |
TWI434076B (zh) | 2014-04-11 |
JP2007298757A (ja) | 2007-11-15 |
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