WO2007138908A1 - 面発光体及び表示装置 - Google Patents
面発光体及び表示装置 Download PDFInfo
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- WO2007138908A1 WO2007138908A1 PCT/JP2007/060355 JP2007060355W WO2007138908A1 WO 2007138908 A1 WO2007138908 A1 WO 2007138908A1 JP 2007060355 W JP2007060355 W JP 2007060355W WO 2007138908 A1 WO2007138908 A1 WO 2007138908A1
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- WIPO (PCT)
- Prior art keywords
- light
- sheet
- prism array
- convex portion
- array sheet
- Prior art date
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- 239000012790 adhesive layer Substances 0.000 claims abstract description 13
- 238000009792 diffusion process Methods 0.000 claims description 85
- 239000000758 substrate Substances 0.000 claims description 52
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 6
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
- G02B5/045—Prism arrays
-
- G—PHYSICS
- G02—OPTICS
- 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
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/875—Arrangements for extracting light from the devices
- H10K59/879—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
Definitions
- the present invention relates to a surface light emitter including a surface light emitting element, and relates to a surface light emitter that greatly improves the amount of light emitted from the surface light emitter and front luminance, and the backlight as a backlight.
- the present invention relates to the display device used.
- an electroluminescent device hereinafter, referred to as an electroluminescent device. It is abbreviated as EL element.
- Such EL elements are roughly classified into inorganic EL elements and organic EL elements depending on the materials used.
- an inorganic EL element generally causes a high electric field to act on a light emitting portion, accelerates electrons in the high electric field and collides with a light emission center, thereby exciting the light emission center to emit light.
- an organic EL element injects electrons and holes from an electron injection electrode and a hole injection electrode, respectively, into the light emitting layer, and combines the injected electrons and holes in the light emitting layer to form an organic material.
- the organic material emits light when it returns to the ground state from the excited state, and has the advantage that it can be driven at a lower voltage than inorganic EL elements.
- a light emitting element that emits light in an appropriate color can be obtained by selecting a light emitting material, and white light can be obtained by appropriately combining the light emitting materials. It is expected to be used as a backlight for display devices such as liquid crystal display elements.
- Patent Documents 9 and 10 As another means for improving the front luminance of a surface light emitting element such as an organic EL light emitting device, a prism array sheet having a surface with unevenness is provided on the light emitting side so that the prism side faces the emitting surface.
- Patent Documents 9 and 10 have been devised (Patent Documents 9 and 10).
- the transparency of the bonded portion of the prism (the property of transmitting light without scattering) is high, the prism array reflected on the back surface of the issuing element through the bonded portion is observed.
- the prism rows are regularly arranged, the prism rows and the mirror images of the prism rows observed by the back surface reflection are overlapped and observed, so that a moiré image is observed.
- Patent Document 1 Japanese Unexamined Patent Publication No. 2000-323272
- Patent Document 2 JP 2000-231985
- Patent Document 3 Japanese Patent Laid-Open No. 7-162037
- Patent Document 4 JP-A-11-111464
- Patent Document 5 Japanese Unexamined Patent Publication No. 2005-63926
- Patent Document 6 Japanese Patent Laid-Open No. 2003-59641
- Patent Document 7 JP-A-6-265888
- Patent Document 8 Japanese Patent Laid-Open No. 2005-353431
- Patent Document 9 Japanese Patent Laid-Open No. 2000-148032
- Patent Document 10 Japanese Patent Application Laid-Open No. 2006-59543
- the present invention has been made in view of the above problems, and in a surface light emitter provided with a surface light emitting element and a display device using the surface light emitter, the light emitted from the surface light emitter.
- the issue is to improve the extraction efficiency.
- an object of the present invention is to provide a surface light emitter capable of greatly increasing the amount of light emitted from the surface light emitter and the front luminance and suppressing the generation of a moire image, and the backlight as a backlight. It is to provide a display device used.
- the first surface light emitter of the present invention has at least a surface light emitting element and a light control sheet, and the light control sheet has a plurality of convex portions on at least one surface, and the tips of the convex portions.
- the portion is in contact with the emission surface of the surface light emitting element through an adhesive layer, and the haze value of the light control sheet is 85% or more.
- the second surface light emitter of the present invention has at least a surface light emitting element, a light control sheet, and a diffusion sheet, and the light control sheet has a plurality of convex portions on at least one side.
- the leading end of the convex portion is in contact with the emission surface of the surface light emitting element via an adhesive layer, and the diffusion sheet is provided on the surface of the light control sheet opposite to the surface in contact with the surface light emitting element.
- the haze value is less than 80%.
- the third surface light emitter of the present invention includes at least a surface light emitting element and a light control sheet, and the light control sheet has a plurality of convex portions on one side and a diffusion structure on one side.
- the tip of the convex portion is in contact with the emission surface of the surface light emitting element through an adhesive layer, and the reflectance of the diffusion structure is less than 35%.
- the fourth surface light emitter of the present invention has at least a surface light emitting element and a light control sheet, and the light control sheet has a plurality of convex portions on at least one surface, and the tips of the convex portions. Part is said surface
- the light emitting element is in contact with an emission surface through an adhesive layer, and the adhesive layer has a diffusion structure.
- the fifth surface light emitter of the present invention has at least a surface light emitting element and a light control sheet, and the light control sheet has a plurality of convex portions on at least one surface, and the tips of the convex portions.
- the surface is in contact with the emission surface of the surface light emitting element through an adhesive layer, the surface light emitting element has a transparent substrate on the emission surface, and the transparent substrate has a diffusion structure. .
- the sixth surface light emitter of the present invention is characterized in that, in the first to fifth surface light emitters, the convex portion has a truncated cone shape.
- the display device is characterized in that the first to sixth surface light emitters of the present invention described above are used as a backlight.
- a surface light emitter that can greatly improve the amount of light emitted from the surface light emitter and the front luminance and suppress the formation of a mole image, and a display using the same as a backlight A device can be provided.
- FIG. 1 is an example of a prism array sheet of the present invention.
- FIG. 2 is an example of an embodiment of a surface light emitter of the present invention.
- FIG. 3 is a schematic view showing light emission by the surface light emitter according to the present invention.
- FIG. 4 is a schematic diagram showing the mechanism of moire image generation.
- FIG. 5 is an example of a surface light emitter having a frustum-shaped convex portion.
- FIG. 6 is an example of a surface light emitter having a diffusion sheet.
- FIG. 7 is an example of a surface light emitter having a diffusion structure on the surface on the viewer side.
- FIG. 8 is an example of a surface light emitter having an adhesive diffusion layer having diffusibility.
- FIG. 9 is an example of a surface light emitter using a diffusion substrate having a diffusion structure on a transparent substrate.
- FIG. 10 A surface light-emitting element that also has an organic EL element force with an organic EL layer and a counter electrode provided on the transparent substrate surface.
- the surface light emitter of the present invention is provided with a plurality of convex portions on at least one surface of the light control sheet, and a tip portion of the convex portions is in contact with the emission surface of the surface light emitting element via an adhesive layer.
- the light sheet is not provided, the light power that is totally reflected on the exit surface of the surface light emitting element is not reflected at the part where the front end surface of the convex part of the light control sheet is bonded, but is guided into the light control sheet. It ’s going to be.
- the convex portion has a frustum shape, and examples thereof include a pyramid and a cone.
- the fact that the tip of the convex portion is in contact with the light emitting element emission surface via an adhesive means that all the convex portions are buried in the adhesive layer, so that only a part of the convex portion is interposed via the adhesive.
- a gap is formed between the surface light emitting element and the light control sheet.
- Most of the light guided into the light control sheet is totally reflected at the interface between the convex part and the space part contracted toward the output surface of the surface light emitting element, and this totally reflected light is emitted from the light control sheet. It is guided to the surface and emitted.
- the extraction efficiency of light emitted through the light control sheet is improved, and the front luminance is greatly improved.
- the light control sheet convex parts arranged regularly of The force that generates a moire image By configuring the light control sheet so that the haze value is 85% or more, the moire image is observed.
- the haze value of the light control sheet was measured with a haze measuring instrument (for example, NIPPON DENSHOKU Haz eMeter NDH2000) in a state where the light control sheet was attached to a transparent glass substrate in the same configuration as the usage form. Value.
- a haze measuring instrument for example, NIPPON DENSHOKU Haz eMeter NDH2000
- the convex portion provided on one side of the light control sheet is formed in a truncated cone shape that contracts toward the tip surface, the light is emitted through the light control sheet.
- the light extraction efficiency is improved and the front luminance is further improved.
- the second surface light emitter of the present invention similarly to the first surface light emitter, the light guided into the light control sheet through the front end surface of the convex portion of the light control sheet bonded thereto is transmitted. Most of the light is totally reflected at the interface between the convex portion and the space portion, and the totally reflected light is guided to the exit surface of the light control sheet and is emitted. As a result, the light extraction efficiency is improved and the front luminance is greatly improved. At this time, since a mirror image of the light control sheet that is transmitted through the convex portion of the light control sheet and reflected by the mirror surface on the back surface of the surface light emitter is observed, a moire image is generated. By providing the diffusion sheet so as to overlap the sheet, moire fringes are not visually recognized.
- the haze value of the diffusion sheet is less than about 80%, the light extraction efficiency and front luminance are high, and the moire fringes cannot be visually recognized.
- the convex portion provided on one side of the light control sheet is formed in a truncated cone shape that contracts toward the tip surface, the light is emitted through the light control sheet.
- the light extraction efficiency is improved and the front luminance is further improved.
- the third surface light emitter of the present invention similarly to the first surface light emitter, the light guided into the light control sheet through the front end surface of the convex portion of the adhered light control sheet. Most of the light is totally reflected at the interface between the convex portion and the space portion, and the totally reflected light is guided to the exit surface of the light control sheet and is emitted. As a result, the light extraction efficiency is improved and the front luminance is greatly improved. At this time, since a mirror image of the light control sheet that is transmitted through the convex portion of the light control sheet and reflected by the mirror surface on the back surface of the surface light emitter is observed, a moire image is generated.
- the Moire fringes are not visually recognized.
- the reflectance of the diffusing structure is less than 35%, the light extraction efficiency and front luminance are high, and moire cannot be visually recognized.
- the haze value of the diffusion structure provided on the light control sheet is measured with a haze measuring instrument (for example, NIPPON DENSHOKU HazeMeter NDH2000) in a state where the diffusion structure is provided on one side of a parallel plate without a convex portion. It is the value.
- a haze measuring instrument for example, NIPPON DENSHOKU HazeMeter NDH2000
- the display element and the surface light emitter are provided and the surface light emitter is used as a backlight of the display element, the above surface is obtained. Light with high front brightness emitted from the emission surface of the light emitter is guided to the display element, and display with high luminance can be performed.
- Embodiment 1 as a light control sheet, as shown in FIGS. 1 (a) and 1 (b), a square frustum-shaped convex portion 12 whose front end side contracts on one side of a light-transmitting substrate 11 continues vertically and horizontally.
- the prism array sheet 10A formed in this way was used.
- the fact that the front end side of the convex portion 12 contracts means that the convex portion 12 is formed so as to gradually become smaller as it goes away from the prism array sheet 10A, and FIG. And in the examples of Figs. 2 to 9, which will be described later, this means that the shape of the lower dent.
- the organic EL layer 23 and the counter electrode 24 are provided on the surface of the transparent substrate 21 on which the transparent electrode 22 is provided.
- the surface light emitting element 20 having EL element power is used, and the surface light emitting element 20 has a square frustum shape in the prism array sheet 10A on the emission surface 21a of the transparent substrate 21 that emits light emitted therefrom.
- the tip surface 12a of the convex portion 12 is adhered.
- the counter electrode 24 is made of a metal such as aluminum, it has a mirror surface with a reflectance of 80% or more.
- the square in the prism array sheet 10A is formed on the emission surface 21a of the surface light emitting element 20.
- the convex portion 12 of the prism array sheet 10A is contracted toward the emission surface 21a of the surface light emitting element 20, and this prism array sheet
- the space 13 between the convex portion 12 of 10A and the emission surface 21a of the surface light emitting element 20 is filled with air lower than the refractive index of the prism array sheet 10A.
- the tip surface 12a of the convex portion 12 having a square frustum shape in the prism array sheet 10A is bonded to the emission surface 21a of the surface light emitting device 20, and the surface light emitting device 20 is emitted.
- the light control sheet when the light control sheet is not provided, the light power totally reflected on the emission surface 21a of the surface light emitting element 20 is bonded to the tip surface 12a of the convex portion 12 of the prism array sheet 10A. In this part, the light is guided into the prism array sheet 10A without being totally reflected.
- the traveling direction is slightly changed by the inclined surface 12b of the convex portion 12, the light is emitted to the front side of the prism array sheet 10A, and the convex portion of the prism array sheet 10A is emitted from the emission surface 21a.
- the light emitted in the direction orthogonal to the 12 inclined surfaces 12b is guided into the convex portion 12 from the inclined surface 12b, and is reflected by the inclined surface 12b opposite to the convex portion 12 to be a prism array sheet. It will be projected on the front side of 10A.
- the light control sheet is not provided as described above, the light power totally reflected on the emission surface 21a of the surface light emitting element 20 is reflected on the prism array sheet from the tip surface 12a of the convex portion 12.
- the difference between the refractive index of the prism array sheet 10A and the refractive index of the exit surface 21a of the surface light emitting element 20 is within 0.2. .
- the apex angle ⁇ at which the inclined surfaces 12b of the convex portion 12 intersect each other is large, If the inclination angle ⁇ of the inclined surface 12b of the convex portion 12 with respect to the emission surface 21a of the surface light emitting element 20 is too small, the light is totally reflected on the emission surface 21a of the surface light emitting element 20 when no light control sheet is provided. Even if the light is guided into the prism array sheet 10A, the light is guided to the exit surface 14 of the prism array sheet 10A without hitting the inclined surface 12b of the convex portion 12, and the exit of the prism array sheet 10A. The light is totally reflected on the surface 14 and returned, and the intensity of light emitted from the emission surface 14 of the prism array sheet 10A is reduced.
- the inclination angle oc of the inclined surface 12b of the convex portion 12 with respect to the emission surface 21a of the surface light emitting element 20 becomes too large.
- the light force guided into the prism array sheet 10A is not reflected by the inclined surface 12b of the convex part 12 but passes through the convex part 12 and is guided to the space part 13, and this space further.
- the light passes through the portion 13 and is guided again into the prism array sheet 10A, and this light is totally reflected and returned by the exit surface 14 of the prism array sheet 10A as described above.
- the intensity of light emitted from the exit surface 14 of 10A decreases.
- the apex angle ⁇ at which the inclined surfaces 12b of the convex portion 12 intersect each other is (1 / n ⁇ when the refractive index with respect to light having a wavelength of 550 nm in the prism array sheet 10A is n. O. 35) ⁇ sin 0 ⁇ (1 / ⁇ + ⁇ . 3) It is preferable to satisfy the condition of 3) and further satisfy the condition of lZn ⁇ sin 0 ⁇ (1 / ⁇ + ⁇ . 25). More preferred.
- the range of the height h of the convex portion 12 is as follows.
- the above-described apex angle at the convex portion 12 is also a force that varies depending on the pitch p of the convex portion 12.
- the height of the convex portion 12 is as follows. If h is too low, even if light totally reflected on the emission surface 21a of the surface light emitting element 20 without a light control sheet is guided into the prism array sheet 10A, the light is projected 1 Instead of hitting the second inclined surface 12b, the light is guided to the output surface 14 of the prism array sheet 10A, and is totally reflected back by the output surface 14 of the prism array sheet 10A.
- the height h of the convex portion 12 becomes too high, a portion that is not used for light reflection is generated on the inclined surface 12b of the convex portion 12, and when the pitch p of the convex portion 12 is the same, a surface emitting element is formed.
- the area of the front end surface 12a of the convex portion 12 bonded to the emission surface 21a of the child 20 is reduced, the amount of light guided into the prism array sheet 10A is reduced. For this reason, this convex part 1
- the height h of 2 preferably satisfies the condition of 0.28p ⁇ h ⁇ l.lp with respect to the pitch p of the convex portion 12.
- a part of the apex of the convex part 12 before being attached is buried in the transparent adhesive, so that the optical part of the convex part that affects the optical function is affected.
- the height h may be lower than the height of the projection before pasting.
- the height h of the convex part 12 here represents the height of the convex part that exerts an optical action after bonding.
- the mirror image of the prism array sheet 10A is formed by the counter electrode 24 having a high reflectivity, and the image of the prism array sheet and the mirror image are observed to overlap each other. An image is generated. The mechanism will be explained using Fig. 4.
- Illumination is performed by light emission from the surface light emitting element 20 of the prism sheet array 10A, and a mirror image 110A is formed. At this time, the formed mirror image is observed as the mirror image 112a partial force of the exit surface 12a of the convex portion 12a of the prism array sheet 10A is high due to the high transmittance of the emitted illumination light, and the other portions are observed to be bright. .
- the illumination that exists mainly on the viewer side separately from the force surface light emitter which is the explanation of the generation principle of the Moire fringes generated when the prism sheet is illuminated by the light emission of the surface light emitting element itself.
- moire fringes are generated.
- the ratio of the area where the exit surface 12a of the convex portion 12 of the prism array sheet 10A is optically in close contact with the exit surface 21a with respect to the area of the exit surface 21a of the surface light emitting element that is, In other words, a light control sheet with a different adhesion area ratio was created, and its haze value was measured to observe moire fringes.
- the haze value was 85% or more, the contrast of the observed moire fringes was sufficiently small.
- the contrast of the moire fringes decreases to such an extent that it is hardly visible.
- the haze value is measured by injecting measurement light from the transparent substrate side with the prism array sheet 10A adhered to the transparent substrate made of the same material as the transparent substrate 21 of the surface light emitting device. (NIPPON DENSHOKU HazeMeter NDH2000).
- the prism array sheet 10A has been described by taking the square pedestal shown in Fig. 1 as an example.
- the light control sheet as shown in Figs.
- a prism array sheet 10E is used in which the periphery of a truncated cone-shaped convex portion 12 whose front end is shrunk on one side of the optical substrate 11 is cut into a square shape and continuously formed vertically and horizontally. good.
- the prism array sheet 10E is provided with the convex portion 12 having a frustum shape
- the front luminance of the light emitted through the prism array sheet 10E is further greatly improved.
- the force that is unclear about this detailed reason According to the study by the present inventors, for example, as shown in FIG. 1, when the convex portion 12 has a square frustum shape, the top of the ridge line in the cross section in the ridge line direction is formed. Since the corner is smaller than the apex angle in the section in the direction of arrangement of the convex parts 12 that are square frustum-shaped, it cannot sufficiently contribute to the improvement of the front brightness.
- the convex part 12 having a frustum shape In the case of the convex part 12 having a frustum shape, the apex angle is constant regardless of the cross-section in any direction V. Therefore, the convex part 12 having a square frustum shape is formed. This is thought to be due to the fact that the emitted light that does not sufficiently contribute to the improvement of the normal brightness that occurs in some cases is not generated.
- the principle of generation of moire fringes can be considered the same as in the case of the quadrangular thrust table already described, in order to reduce the visibility of moire fringes. It is effective to increase the haze value of the prism array sheet 10E. If the haze value is 80% or more, the visibility of moire fringes is sufficiently small, and if the haze value is 88% or more, it is more desirable. .
- the light extraction efficiency and the front luminance are increased to increase the moire fringes.
- the shape that lowers the visibility is not limited to those, but may be a shape such as a triangular thruster or a hexagonal thruster.
- an organic EL element is used as the surface light emitting element 20.
- the surface light emitting element 20 may be any inorganic EL element that emits light in a planar shape. It is particularly effective to use organic EL elements that can be expected to greatly improve brightness.
- FIG. 1 As the light control sheet, as in the case of the first embodiment, FIG.
- a square frustum-shaped convex portion 12 having a contracted tip side is provided on one side of the translucent substrate 11.
- the tip surface 12a of the convex portion 12 in the prism frustum shape of the prism array sheet 10A is adhered to the emission surface 21a of the transparent substrate 21 that emits the light emitted from the surface light emitting element 20.
- a diffusion sheet 200 was provided on the viewer side from the prism array sheet 10A.
- the haze value is not inconvenient, but if the haze value is too high, the light extraction efficiency is improved and the front luminance is increased. It will interfere with the function of the prism array sheet 10A such as improvement of the above.
- the inventors of the present invention have conducted research and found that when the haze value of the diffusion sheet 200 is less than 80%, the light extraction efficiency and the surface brightness when the surface light emitting element 20 and the prism array sheet 10A are combined are sufficient. It found out that the effect which becomes high was acquired. Greater effects can be obtained when the haze value is less than 65%.
- the apex angle ⁇ at which the inclined surfaces 12b of the convex portions 12 of the prism array sheet 10A intersect each other is 550 nm in the wavelength of the prism array sheet 10A.
- the refractive index for light is n, it is preferable to satisfy the condition of (lZn— 0.35) sin 0 (1 / n + O. 3).
- LZn ⁇ sin 0 ⁇ (1 / n It is more preferable to satisfy the condition of + O. 25).
- the prism array sheet 10A has a convex portion 12.
- the height h preferably satisfies the condition of 0.28p ⁇ h ⁇ l.lp with respect to the pitch p of the convex part 12. When these conditions are satisfied, higher light extraction efficiency and front luminance can be obtained.
- the prism array sheet 10A has been described by taking the square pedestal shown in FIG. 1 as an example.
- the light control sheet as shown in FIGS.
- a prism array sheet 10E is used in which the periphery of a truncated cone-shaped convex portion 12 whose front end is shrunk on one side of the optical substrate 11 is cut into a square shape and continuously formed vertically and horizontally. good.
- the prism array sheet 10E is provided with the convex portion 12 having a frustum shape, the light emitted through the prism array sheet 10E for the same reason as described in the first embodiment.
- the front brightness is further improved.
- Embodiment 3 as in the case of Embodiment 1 above, the prism array sheet 10A shown in FIGS. 1 (a) and 1 (b) is used as the light control sheet, and the tip side is on one side of the translucent substrate 11. A contracted convex frustum 12 is provided.
- the emission surface 21a of the transparent substrate 21 that emits the light emitted from the surface light emitting element 20 The front end surface 12a of the convex portion 12 having a square frustum shape in the prism array sheet 10A is adhered.
- a diffusion structure 210 was provided on the surface closer to the viewer than the prism array sheet 10A.
- the light emitted from the surface light emitting element 20 is emitted.
- the light totally reflected by the surface 21a is guided to the inside of the prism array sheet 10A without being totally reflected at the portion where the tip surface 12a of the convex portion 12 of the prism array sheet 10A is bonded.
- most of the light guided into the prism array sheet 10A is reflected on the inclined surface 12b of the convex portion 12 contracted toward the emission surface 21a of the surface light emitting element 20, and this reflected light is reflected in the prism array.
- the light is guided to and emitted from the exit surface 14 of the sheet 10A.
- a visible moire fringe is generated by the configuration of the surface light emitting element 20 and the prism array sheet 10A.
- FIG. By providing, it becomes possible to make a state where a moire fringe cannot be visually recognized.
- moire fringes were not observed at all when the haze value of the diffusion structure was set to 30% or more.
- the degree of moire fringes generated by the combination of the surface light emitting element 20 and the prism array sheet 10A even if the diffusion structure 210 having a smaller haze value is used, a sufficient effect may be exhibited.
- the diffusion structure bead diffusion or diffusion due to surface irregularities can be used.
- the haze value of the diffusion structure is too high, functions such as improvement of light extraction efficiency and improvement of front luminance are hindered.
- the inventors of the present invention have conducted research and found that when the haze value of the diffusion structure 210 is less than 70%, the light extraction efficiency and front luminance of the surface light emitter can be sufficiently increased. Further, when the haze value is less than 65%, a greater effect can be obtained. It was also found that sufficient light extraction efficiency can be obtained by using the diffusion structure 210 having a reflectance of 30% or more.
- the haze value and reflectance of the diffusing structure were measured with a haze measuring device or the like by forming the diffusing structure on a sheet of the same material without prism rows.
- the apex angle ⁇ at which the inclined surfaces 12b of the convex portions 12 of the prism array sheet 10A intersect each other is 550 nm in the wavelength of the prism array sheet 10A. It is preferable to satisfy the condition of (lZn— 0. 35), sin 0, (1 Zn + O. 3), where lZn ⁇ sin 0 ⁇ (1 / n + It is more preferable to satisfy the condition of O. 25).
- the height h of the convex portion 12 of the prism array sheet 10A is 0.28p ⁇ h ⁇ l.lp with respect to the pitch p of the convex portion 12. It is preferable to satisfy the conditions. When these conditions are satisfied, higher light extraction efficiency and front luminance can be obtained.
- the prism array sheet 10A has been described by taking the square pedestal shown in FIG. 1 as an example.
- the light control sheet as shown in FIGS.
- a prism array sheet 10E is used in which the periphery of a truncated cone-shaped convex portion 12 whose front end is shrunk on one side of the optical substrate 11 is cut into a square shape and continuously formed vertically and horizontally. good.
- the prism array sheet 10E is provided with the convex portion 12 having a frustum shape, for the same reason as described in the first embodiment, the front luminance of the light emitted through the prism array sheet 10E is further greatly improved.
- the prism array sheet 1 OA is bonded to the emission diffusion surface 22 on the emission surface 21a of the transparent substrate 21 that emits the light emitted from the surface light emitting element 20.
- the tip surface 12a of the convex part 12 having a square frustum shape is bonded via 0.
- the condition for improving the visibility of moire fringes is that the amount of light that passes through the front end surface 12a of the convex portion 12 without being bent is large.
- the light extraction efficiency and the front luminance can be increased because the wall 12b of the convex portion 12 does not affect the light beam extracted in the direction or the light beam bent in the front direction.
- the transparent substrate that emits the light emitted from the surface light emitting element 20 is the diffusion substrate 230 having a diffusion structure, and the prism array sheet 10A is squared on the emission surface 21a.
- the tip surface 12a of the convex part 12 having a frustum shape is adhered.
- the condition for increasing the visibility of the moire fringes is due to the high visibility of the mirror image of the prism array sheet 10A. Therefore, the transparent that forms the light emitting element 20 is used. By providing the substrate with diffusibility to form the diffusion substrate 230, it is possible to obtain an effect of significantly reducing the visibility of moire fringes.
- the light extraction efficiency and the front luminance can be increased because the wall 12b of the convex portion 12 does not affect the light extraction direction or the light beam bent in the front direction.
- the surface light emitter of the present invention includes an organic EL display, an inorganic display, a PDP (plasma display). It is used as a backlight for various display devices such as spray.
- LCDs with reflective, transmissive, and transflective LCDs or LCDs with various drive systems such as TN, STN, OCB, HAN, VA (PVA, MVA), IPS, etc. It is also preferably used as a backlight.
- the liquid crystal display device has an effect of obtaining an image with high front luminance and high contrast.
- the surface light emitters according to the examples of the present invention and the surface light emitters of the comparative examples are compared.
- the light emitted from the surface light emitters is compared. It will be explained that the extraction efficiency and front luminance of the light source are greatly improved, and that a good luminous body in which no moire fringes are observed can be obtained.
- the surface light emitting device 20 was used as it is as a surface light emitter.
- the surface light emitting element 20 the surface of the transparent substrate 21 on which the transparent electrode 22 is provided as described above, and the surface on which the organic EL layer 23 and the counter electrode 24 are provided also has an organic EL element force.
- the light emitting element 20 was used.
- an alkali-free glass having a thickness of 0.7 mm and a size force of Omm ⁇ 52 mm is used as the transparent substrate 21, and a transparent electrode 22 is provided on one surface of the transparent substrate 21.
- ITO was deposited to a thickness of 150 nm, patterned into an electrode shape by a photolithography method, and a size of 35 X 46 mm was used.
- the resistance of the transparent electrode 22 was measured using Loresta (Mitsubishi Chemical Corporation), the resistance was 20 ⁇ Z port.
- a hole transport layer having a film thickness of lOOnm was formed on the transparent electrode 22 by vacuum deposition using a triazole derivative as a hole transport material.
- a light emitting layer made of tris (8-quinolinolato) was deposited on the hole transport layer by a vacuum deposition method to form a light emitting layer having a thickness of lOOnm.
- a hole blocking layer having a thickness of lOOnm was formed on the light emitting layer by depositing a triazine derivative by a vacuum deposition method.
- a nitro-substituted fluorene derivative is formed on the hole blocking layer by a vacuum deposition method.
- An electron transport layer having a thickness of lOOnm was formed by vapor deposition.
- a counter electrode 24 made of aluminum having a thickness of lOOnm was formed on the electron transport layer by sputtering.
- the transparent substrate 21 on the emission surface 21a side of the surface light emitting element 20 had a refractive index of 1.517 with respect to light having a wavelength of 550 nm.
- the prism-shaped convex portion 12 of the prism array sheet 10A is opposed to the emission surface 21a of the surface light-emitting element 20 of Comparative Example 1, and this prism array sheet 10A is used.
- 10A was bonded to the emission surface 21a of the surface light emitting element 20.
- An adhesive was used as the bonding method. The thickness of the adhesive was 10 m. Height of convex part before bonding
- the prism array sheet 10A has a refractive index of 1.495 for light having a wavelength of 550 nm, the apex angle ⁇ force 0 ° of the triangular prism-shaped convex portion 12 shown in FIG. 5, and a convex portion having a quadrangular pyramid shape.
- the height of 12 was 20.4 m, and the pitch of the convex portion 12 was 35 ⁇ m.
- the height of the convex part after bonding was 15.4 m.
- the experiment was conducted by changing the height of 2 to 16. 9 / ⁇ ⁇ and 9. 9 / z m.
- the height of the convex part after bonding is
- the convex portion 12 of the prism array sheet has a truncated cone shape, the apex angle ⁇ force of the convex portion 12 is 2 °, and the height of the convex portion 12 is 20.4 ⁇ ,
- the pitch of convex 12 is 3
- Example 1 As shown in Embodiment 1 above, a square frustum-shaped convex portion 12 whose tip side contracts on one side of a light-transmitting substrate 11 as a light control sheet is formed continuously in the vertical and horizontal directions.
- the prism array sheet 10A thus prepared, the front end surface 12a of the convex portion 12 having a square frustum shape in the prism array sheet 10A was adhered to the emission surface 21a of the surface light emitting element 20 of Comparative Example 1.
- This prism array sheet 10A has a refractive index of 1.495 for light having a wavelength of 550 nm, the apex angle ⁇ force of the above-mentioned quadrangular frustum-shaped convex portion 12 is 0 °, and has a quadrangular pyramid-shaped convex portion.
- the height of 12 was 30.9 / ⁇ ⁇ , and the pitch of the convex portion 12 was 35 / zm.
- the height of the convex part after bonding was 25.9 m.
- the convex portion 12 of the prism array sheet has a truncated cone shape, and the height of the convex portion 12 is 28.1 m, 24.6 m, and the pitch of the convex portion 12 is Was 35 m.
- the height of the protrusions after bonding was 23.1 m and 19.6 m, respectively.
- the surface light emitting elements in the respective surface light emitters of Comparative Examples 1 to 5 and Examples 1 to 3 are caused to emit light, and the front luminance and light extraction efficiency of the surface light emitter of Comparative Example 1 are 1
- the front luminance and light extraction efficiency of each surface light emitter were measured.
- the light extraction efficiency is the luminance in a direction that forms a predetermined angle with respect to the normal in the plane including the normal when the normal direction of the surface light emitter is set to 0 ° by an angle-luminance measuring device. Measurement was performed while changing the angle, and the value obtained by integrating the luminance for each angle was compared with the value of Comparative Example 1.
- the surface light emitting element was made to emit light, and the prism array sheet was observed with a microscope, and the adhesion area ratio was measured.
- Table 1 shows the measurement results of front luminance, light extraction efficiency, and moire fringes of Comparative Examples 1 to 5 and Examples 1 to 3.
- Comparative Example 25 As a result, in Comparative Example 25, the force at which moire fringes were observed. In Example 13 the moire fringes were observed with little or no observation.
- the haze value of the prism array sheet of Comparative Example 25 was less than 85%, whereas the haze value of the prism array sheet of Example 13 was 85% or more.
- the prism array sheet 10A shown in FIGS. 1 (a) and 1 (b) is used as the light control sheet, and the tip is placed on one side of the translucent substrate 11. Protrusions 12 with a truncated pyramid shape that is contracted on the side are provided. Then, the front end surface 12a of the convex portion 12 having a square frustum shape in the prism array sheet 10A is adhered to the emission surface 21a of the transparent substrate 21 that emits the light emitted from the surface light emitting element 20. did. At the same time, as shown in FIG. 6, a diffusion sheet 200 was provided on the viewer side from the prism array sheet 10A.
- the prism array sheet shown in Comparative Example 2 was used as the prism array sheet 10A.
- a diffusion plate D114 manufactured by Tsujiden Co., Ltd. was used in Comparative Example 6, and a diffusion plate D123 manufactured by Tsujiden Co., Ltd. was used in Comparative Example 7.
- the prism array sheet 10A shown in FIGS. 1 (a) and 1 (b) is used as the light control sheet, and the tip is placed on one side of the translucent substrate 11. Protrusions 12 with a truncated pyramid shape that is contracted on the side are provided. Then, the front end surface 12a of the convex portion 12 having a square frustum shape in the prism array sheet 10A is adhered to the emission surface 21a of the transparent substrate 21 that emits the light emitted from the surface light emitting element 20. did. At the same time, as shown in FIG. 6, a diffusion sheet 200 was provided on the viewer side from the prism array sheet 10A.
- the prism array sheet shown in Comparative Example 2 was used as the prism array sheet 10A.
- the diffusion sheet 200 the diffusion plate D120 manufactured by Tsujiden Co., Ltd. was used in Example 5, the diffusion plate D129 manufactured by Tsujiden Co., Ltd. was used in Example 6, and the diffusion plate D1 manufactured by Tsujiden Co., Ltd. was used in Example 7.
- Example 8 a diffusion plate D134 manufactured by Tsujiden Co., Ltd. was used.
- the prism array sheet 10A shown in FIGS. 1 (a) and 1 (b) is used as the light control sheet as in the case of the second embodiment, and the tip is formed on one side of the translucent substrate 11. Protrusions 12 with a truncated pyramid shape that is contracted on the side are provided.
- the surface light emitting element 20 emits light.
- the tip end surface 12a of the convex portion 12 having a square frustum shape in the prism array sheet 10A is adhered to the emission surface 21a of the transparent substrate 21 from which the emitted light is emitted.
- a diffusion sheet 200 was provided on the viewer side from the prism array sheet 10A.
- the prism array sheet shown in Comparative Example 5 was used as the prism array sheet 10A.
- As the diffusion sheet 200 a diffusion plate D114 manufactured by Tsujiden Co., Ltd. was used in Comparative Example 8, and a diffusion plate D123 manufactured by Tsujiden Co., Ltd. was used in Comparative Example 9.
- the prism array sheet 10A shown in FIGS. 1 (a) and 1 (b) is used as the light control sheet as in the case of the above-described Embodiment 2, and the tip is formed on one surface of the translucent substrate 11. Protrusions 12 with a truncated pyramid shape with a contracted side are provided. Then, the tip surface 12a of the convex portion 12 in the prism frustum shape of the prism array sheet 10A is adhered to the emission surface 21a of the transparent substrate 21 that emits the light emitted from the surface light emitting element 20. did. At the same time, as shown in FIG. 6, a diffusion sheet 200 was installed on the viewer side from the prism array sheet 10A.
- the prism array sheet shown in Comparative Example 5 was used as the prism array sheet 10A.
- the diffusion sheet 200 the diffusion plate D120 manufactured by Tsujiden Co., Ltd. was used in Example 9, the diffusion plate D129 manufactured by Tsujiden Co., Ltd. was used in Example 10, and the diffusion plate D manufactured by Tsujiden Co., Ltd. was used in Example 11.
- Example 12 a diffusion plate D134 manufactured by Tsujiden Co., Ltd. was used.
- the prism array sheet 10A shown in FIGS. 1 (a) and 1 (b) is used as the light control sheet, as in the case of Embodiment 2 above, and the tip is placed on one side of the translucent substrate 11.
- a square frustum-shaped convex part 12 having a contracted side is provided.
- the tip surface 12a of the convex portion 12 in the prism frustum shape of the prism array sheet 10A is adhered to the emission surface 21a of the transparent substrate 21 that emits the light emitted from the surface light emitting element 20.
- a diffusion sheet 200 was installed on the viewer side from the prism array sheet 10A.
- the prism array sheet shown in Comparative Example 3 was used as the prism array sheet 10A.
- a diffusion plate D114 manufactured by Tsujiden Co., Ltd. was used in Comparative Example 10
- a diffusion plate D123 manufactured by Tsujiden Co., Ltd. was used in Comparative Example 11.
- the prism array sheet 10A shown in FIGS. 1 (a) and 1 (b) is used as the light control sheet as in the case of the above-described Embodiment 2, and the tip is placed on one side of the translucent substrate 11.
- a square frustum-shaped convex part 12 having a contracted side is provided.
- the tip surface 12a of the convex portion 12 in the prism frustum shape of the prism array sheet 10A is adhered to the emission surface 21a of the transparent substrate 21 that emits the light emitted from the surface light emitting element 20.
- a diffusion sheet 200 was installed on the viewer side from the prism array sheet 10A.
- the prism array sheet shown in Comparative Example 3 was used as the prism array sheet 10A.
- the diffusion sheet 200 a diffusion plate D120 manufactured by Tsujiden Co., Ltd. was used in Example 13, a diffusion plate D129 manufactured by Tsujiden Co., Ltd. was used in Example 14, and a diffusion plate manufactured by Tsujiden Co., Ltd. was used in Example 15.
- a diffusion plate D134 manufactured by Tsujiden Co., Ltd. was used.
- Comparative Example 6 ⁇ Table 2 shows the measurement results of front luminance, light extraction efficiency, and moire fringes of L 1 and Examples 5 to 16.
- Comparative Example 12 In Comparative Example 12, as in the case of Embodiment 3 described above, the prism array sheet 10A shown in FIGS. 1 (a) and 1 (b) is used as the light control sheet, and the tip side is converged on one side of the translucent substrate 11. Convex projections 12 with a truncated square frustum shape are provided. Then, the tip surface 12a of the convex portion 12 in the prism frustum shape of the prism array sheet 10A is adhered to the emission surface 21a of the transparent substrate 21 that emits the light emitted from the surface light emitting element 20. I made it. At the same time, as shown in FIG. 7, a diffusion structure 210 is provided on the surface closer to the viewer than the prism array sheet 10A.
- the prism array sheet shown in Comparative Example 2 was used as the prism array sheet 10A.
- the diffusing structure 210 in Comparative Example 12, a bead dispersion type diffusing structure was used, and its reflectance was 40.0%.
- the reflectance was measured by creating a diffusion sheet composed of the light-transmitting substrate 11 without the prism array and the diffusion structure 210, and irradiating the measurement light from the side without the diffusion structure. .
- the prism array sheet 10A shown in FIGS. 1 (a) and 1 (b) is used as the light control sheet, and the tip is placed on one side of the translucent substrate 11. Protrusions 12 with a truncated pyramid shape with a contracted side are provided. Then, the tip surface 12a of the convex portion 12 in the prism frustum shape of the prism array sheet 10A is adhered to the emission surface 21a of the transparent substrate 21 that emits the light emitted from the surface light emitting element 20. did. At the same time, as shown in FIG. 7, a diffusion structure 210 is provided on the surface closer to the viewer than the prism array sheet 10A.
- the prism array sheet shown in Comparative Example 2 was used as the prism array sheet 10A.
- a bead diffusion type was used as the diffusion structure.
- the reflectivities of the diffusion structures in Examples 17 to 21 were as shown in Table 3.
- Table 3 shows the results of observation of moire fringes in the surface light emitters of Comparative Example 12 and Examples 17 to 21 by measuring the front luminance and light extraction efficiency by emitting light from the surface light emitting elements.
- Comparative Example 12 As a result, in Comparative Example 12 and Examples 17 to 21, no moire fringes were observed. In Comparative Example 12, the light extraction efficiency was less than 1.5 and the front luminance was less than 1.7, and it was found that sufficient performance could not be obtained. In Examples 17 to 21, the light extraction efficiency is 1. High performance was obtained with 5 or more and front brightness of 1.7 or more.
- Comparative Example 13 a surface light emitter having the same configuration as in Comparative Example 12 was used, except that a prism array sheet provided with convex portions in the shape of a truncated cone was used as the light control sheet. A prism array sheet having the same shape as in Example 3 was used as the prism array sheet. Diffusion structure 21
- Comparative Example 13 a bead dispersion type diffuser plate was used, and the haze value and reflectance were 82.4% and 40.0%.
- Example 22 to 26 the same surface light emitter as in Comparative Example 13 was used.
- the reflectivities of the diffusion structures in Examples 22 to 26 were as shown in Table 3.
- Table 3 shows the results of measuring surface brightness and light extraction efficiency and observing moire fringes.
- the surface light emitters of Examples 1 to 26 of the present invention were used as Fujitsu's VA liquid crystal display device.
- the built-in backlight of the 15-inch display VL-150SD it was found that a liquid crystal display device with excellent brightness could be obtained.
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Abstract
Description
Claims
Priority Applications (2)
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US12/302,124 US20090116221A1 (en) | 2006-05-31 | 2007-05-21 | Surface light emitter and display device |
JP2008517847A JP5309993B2 (ja) | 2006-05-31 | 2007-05-21 | 面発光体及び表示装置 |
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JP2006151381 | 2006-05-31 | ||
JP2006-151381 | 2006-05-31 |
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WO2007138908A1 true WO2007138908A1 (ja) | 2007-12-06 |
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PCT/JP2007/060355 WO2007138908A1 (ja) | 2006-05-31 | 2007-05-21 | 面発光体及び表示装置 |
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US (1) | US20090116221A1 (ja) |
JP (1) | JP5309993B2 (ja) |
WO (1) | WO2007138908A1 (ja) |
Cited By (2)
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JP2012195174A (ja) * | 2011-03-17 | 2012-10-11 | Toppan Printing Co Ltd | El素子、並びにそれを用いた照明装置、ディスプレイ装置及び液晶ディスプレイ装置 |
JP2013077412A (ja) * | 2011-09-30 | 2013-04-25 | Toppan Printing Co Ltd | El素子及びこれを用いた照明装置、ディスプレイ装置、液晶ディスプレイ装置 |
Families Citing this family (8)
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US8123391B2 (en) * | 2006-08-17 | 2012-02-28 | Konica Minolta Holdings, Inc. | Surface light emitter |
EP2658343A4 (en) * | 2010-12-24 | 2017-11-08 | Zeon Corporation | Light emitting element |
EP2693840A4 (en) * | 2011-03-29 | 2014-12-24 | Zeon Corp | LIGHT EMITTING ELEMENT AND LIGHTING APPARATUS |
JP5743681B2 (ja) * | 2011-04-26 | 2015-07-01 | ミネベア株式会社 | 照明装置 |
TWI495175B (zh) * | 2012-11-16 | 2015-08-01 | Au Optronics Corp | 有機電致發光元件 |
CN104698517B (zh) * | 2013-12-09 | 2017-02-22 | 纬创资通股份有限公司 | 光学膜片、光学膜片组件及光学膜片的制造方法 |
CN105280838B (zh) * | 2015-09-22 | 2017-08-25 | 深圳市华星光电技术有限公司 | 一种oled发光器件及显示装置 |
CN109445173B (zh) * | 2019-01-02 | 2021-01-22 | 京东方科技集团股份有限公司 | 一种防窥膜及其制作方法、显示模组 |
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- 2007-05-21 WO PCT/JP2007/060355 patent/WO2007138908A1/ja active Application Filing
- 2007-05-21 US US12/302,124 patent/US20090116221A1/en not_active Abandoned
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US20090116221A1 (en) | 2009-05-07 |
JPWO2007138908A1 (ja) | 2009-10-01 |
JP5309993B2 (ja) | 2013-10-09 |
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