WO2008020514A1 - Appareil émetteur de lumière en surface - Google Patents
Appareil émetteur de lumière en surface Download PDFInfo
- Publication number
- WO2008020514A1 WO2008020514A1 PCT/JP2007/063421 JP2007063421W WO2008020514A1 WO 2008020514 A1 WO2008020514 A1 WO 2008020514A1 JP 2007063421 W JP2007063421 W JP 2007063421W WO 2008020514 A1 WO2008020514 A1 WO 2008020514A1
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- WO
- WIPO (PCT)
- Prior art keywords
- light
- control sheet
- emitting device
- surface light
- light emitting
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
- G02B5/23—Photochromic filters
-
- 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
-
- 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 surface light emitting device including a surface light emitting element, and is characterized in that the front luminance of light emitted from the surface light emitting device is greatly improved.
- 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 also be obtained by appropriately combining the light emitting materials. It is also expected to be used as a backlight for liquid crystal display elements.
- a front luminance of about 2000 to 4000 cdZm 2 is required.
- the convex portions are arranged.
- the light reflection state varies greatly, and there is still a problem that the front luminance cannot be sufficiently improved.
- the maximum luminance is 1500 to 2000 cdZ m 2
- the front luminance only increases by about 1.5 times at maximum, and it was difficult to obtain sufficient brightness.
- An object of the present invention is to greatly improve the front luminance of light emitted from the surface light emitting device force in a surface light emitting device including a surface light emitting element.
- the surface light emitting device including the surface light emitting element and the light control sheet
- at least one side of the light control sheet is provided with a repetitive pattern of unevenness having a trapezoidal cross-sectional shape, and the protrusion side of the unevenness
- the flat surface at the tip is in close contact with the exit surface of the surface light-emitting element, and the apex angle between the opposing slopes protruding in the trapezoidal shape of the light control sheet is ⁇ , and the refractive index of the light control sheet is n, where D is the ratio of the length of the part that is in close contact with the exit surface of the surface light emitting element to the length of one period in one arrangement direction of the unevenness of the light control sheet, 0.75>D> 4 [(sin 0-1 / ⁇ ) 2 +0. 034]
- the flat portion at the tip of the protrusion on the unevenness is brought into close contact with the emission surface of the surface light emitting element.
- adhesive refers to the case of bonding with an optical adhesive or other material transparent to the wavelength used.
- the length of the portion in close contact with the emission surface of the surface light emitting element with respect to the length of one period in the arrangement direction of the unevenness of the light control sheet If the ratio D is different, the smaller value satisfies the above condition of 0.75>D> 4 [(sin 0-1 / n) 2 + 0. O 34 ].
- the cross-sectional shape of the convex portion formed on one surface of the light control sheet is an isosceles trapezoid.
- the square pyramid shape means a shape in which the top of the quadrangular pyramid is cut and the cross section becomes a trapezoid.
- the frustoconical shape means a shape in which the top of the cone is cut and the cross section becomes a trapezoid.
- the concave portion of the unevenness formed on one side of the light control sheet is an inverted quadrangular pyramid shape or an inverted quadrangular frustum shape, the above D is
- the surface light emitting device including the surface light emitting element and the light control sheet
- At least one surface is provided with a repeating pattern of unevenness, and a flat surface portion at the tip of the protrusion on the unevenness is in close contact with the emitting surface of the surface light emitting element, and the light emitting area of the surface light emitting element is S0, and the convex portion is S is the area of the surface light emitting device that is in close contact with the light exit surface
- the cross-sectional shape of the convex portion formed on one surface of the light control sheet is trapezoidal, more preferably an isosceles trapezoid. To be in shape.
- the light emitting area S0 of the surface light emitting element, the area S1 of the portion where the convex portion is in close contact with the emission surface of the surface light emitting element, The area S2 of the part where the front brightness is higher than the front brightness of the part where the convex part is closely attached is
- the flat surface at the front end on the protruding side of the light control sheet provided with a repetitive pattern of unevenness having a trapezoidal cross section on at least one surface is surface-emitting.
- the light is not reflected at the worn portion but is guided into the light control sheet. And much of the light guided into the light control sheet in this way is reflected or refracted on the inclined surface of the convex part having a trapezoidal shape, and the light thus reflected or refracted is reflected in the light control sheet.
- the light is guided to the light exit surface and emitted.
- light having a critical angle or less is emitted from the exit surface portion of the surface light emitting element where the flat portion at the tip of the convex portion is not in close contact, and the emitted light is also refracted by the light control sheet. As a result, the light is emitted from the emission surface of the light control sheet.
- the light control sheet is passed through.
- the front brightness of the light emitted from the front and in the range of 15 ° from the front is greatly improved, and the above front brightness is improved by about 1.6 times or more compared to the case where no light control sheet is provided. To do.
- the above D is 0.58>D> 4 If the condition of [(sin 0- ⁇ / n) 2 + 0. 058] is satisfied, the amount of light emitted from the exit surface of the light control sheet is further increased, and the front luminance is further improved. .
- the above D is 0.55>D> 4 If the condition of [(sin 0-1 / n) 2 + 0.0.04] is satisfied, the amount of light emitted from the exit surface of the light control sheet is further increased, and the front luminance is further improved. .
- the D is 0. 4>D> 4 [(sin 0-1 / ⁇ ) 2 +0. 034] If the condition is satisfied, the exit surface force of the light control sheet further increases the amount of light emitted, and The brightness is further improved.
- the flat surface portion provided at the tip on the protruding side of the unevenness Is in close contact with the light emitting surface of the surface light emitting element, the light emitting area S0 of the surface light emitting element, the area S1 of the portion where the convex portion is in close contact with the light emitting surface of the surface light emitting element, and the convex portion
- the light emitted through the above light control sheet The front brightness in the range of 15 ° from the front and front is greatly improved, and the above front brightness is improved by about 1.6 times or more compared to the case where no light control sheet is provided.
- the light emitting area S0 of the surface light emitting element, the area S1 of the portion where the convex portion is in close contact with the emission surface of the surface light emitting element, and the convex portion are in close contact with each other. If the area S2 of the part where the front brightness is higher than the front brightness of the part satisfies the condition of 0. O9S0 and S1 ⁇ 0.5S2, the exit surface force of the light control sheet further increases the amount of light emitted Thus, the front luminance is further improved.
- the surface light emitting device according to the present invention is not limited to those shown in the following embodiments, and can be implemented with appropriate modifications within a range not changing the gist thereof.
- the flat surface portion 12a at the tip of the convex portion 12 is square on one side of the translucent substrate 11.
- the light-modulating sheet 10A in which the square frustum-shaped convex portions 12 formed in the shape are continuously formed in the X direction and the y direction of the translucent substrate 11 is used.
- the convex portion 12 has an isosceles trapezoidal shape with the same cross-sectional shape in the X direction and the y direction of the translucent substrate 11.
- 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 light emitting surface 21a of the transparent substrate 21 that emits the light emitted from the surface light emitting element 20 has a square frustum shape in the light control sheet 10A.
- the flat surface portion 12a at the tip of the convex portion 12 was optically bonded.
- the optical adhesion means that the light emitted from the emission surface 21a of the transparent substrate 21 is guided so as to be guided to the convex portion 12 of the light control sheet 10A without being refracted at the adhesion portion.
- the ratio of the length in the X direction of the portion where the flat portion 12a at the tip of the convex portion 12 is bonded to the emission surface 21a of the surface light emitting element 20 Dx force 0 75>Dx> 4 [(sin 0-1 / n) 2 + 0. 034] and the planar portion 12a at the tip of the convex portion 12 is surface emitting in the y direction of the light control sheet 10A.
- Ratio of length in the y direction of the part bonded to the emission surface 21a of the element 20 Dy force 0.75>Dy> 4 [(sin 0-1 / ⁇ ) 2 + 0.03] .
- the value of Dx, Dy is less than 0.75 because the value of Dx, Dy is 0. If it is 75 or more, the flat surface portion 12a at the tip of the convex portion 12 that is in close contact with the emission surface 21a of the surface light emitting element 20 becomes too much, and the light emitting sheet 10A has an inner surface of the light control sheet 10A through the convex portion 12
- the force that increases the amount of light guided to the light control sheet 10A is not reflected by the inclined surface 12b of the convex portion 12 but is directly guided to the exit surface 14 of the light control sheet 10A. This is because the light is totally reflected on the light exiting surface 14 of the light control sheet 10A and returned, and the intensity of light emitted from the light output surface 14 of the light control sheet 10A is reduced.
- the emission surface of the surface light-emitting element 20 is provided.
- the light that is totally reflected is guided into the light control sheet 10A without being totally reflected at the portion where the flat portion 12a at the tip of the convex part 12 of the light control sheet 10A is bonded.
- Most of the light guided into the light control sheet 10A is an inclined surface 12b of the convex portion 12 that is the interface between the convex portion 12 and the spatial portion 13 that are condensed toward the emission surface 21a of the surface light emitting element 20.
- the deflected light is led to the exit surface 14 of the light control sheet 10A and emitted.
- the light emitted from the emission surface 21a in a direction orthogonal to the inclined surface 12b of the convex portion 12 in the light control sheet 10A is guided from the inclined surface 12b into the convex portion 12, and this convex portion.
- the light is deflected by the inclined surface 12b opposite to 12 and is emitted to the front side of the light control sheet 10A.
- the front luminance of the light emitted from the light emitting surface 14 of the light control sheet 10A and the range of ⁇ 15 ° from the front is greatly improved.
- the front brightness was improved by about 1.6 times or more.
- the front luminance of the light emitted from the emission surface 14 of the light control sheet 10A is examined, and FIG. Flat
- the part sl to which the surface part 12a is bonded is shown in gray, and the part s2 having a higher front luminance than the part si to which the flat part 12a is bonded is white, and the part s2 to which the flat part 12a is bonded is low.
- the part s3 is shown in black.
- the light emitting area S0 of the surface light emitting element 20, that is, the area of the emission surface 21a of the surface light emitting element 20, and the planar portion 12a of the convex part 12 are bonded to the emission surface 21a of the surface light emitting element 20.
- the area Sl of the portion that is, the total area of the portion sl shown in gray in FIG. 4, and the area S2 of the portion of the front luminance higher than the flat portion 12a of the convex portion 12 bonded to the emission surface 21a, that is, In other words, when the relationship with the total area of the portion s2 shown in white in FIG. 4 was examined, the condition of 0.04SO ⁇ S1 ⁇ 1.4S2 was satisfied.
- a square frustum-shaped convex portion in which the flat portion 12a at the tip is a square shape.
- Force that uses 12 formed continuously in X direction and y direction As shown in Figs. 5 (A) and 5 (B), on one side of translucent substrate 11, a regular square frustum shape
- a light control sheet 10A ′ in which the convex portions 12 formed in this way are formed in the X direction and the y direction through the required intervals, respectively.
- an organic EL element is used as the surface light emitting element 20.
- the surface light emitting element 20 may be an inorganic EL element or the like as long as it emits light in a planar shape. However, it is particularly effective to use organic EL elements that are expected to greatly improve brightness.
- the flat surface portion 12a at the tip of the convex portion 12 is rectangular on one side of the translucent substrate 11.
- the light-modulating sheet 10A in which the square frustum-shaped convex portions 12 formed in the shape are continuously formed in the X direction and the y direction of the translucent substrate 11 is used.
- the convex portion 12 has an isosceles trapezoidal shape in which the cross-sectional shapes of the translucent substrate 11 in the X direction and the y direction are the same in height and different in shape.
- the emission surface 21a of the transparent substrate 21 that emits the light emitted from the surface light-emitting element 20 is used.
- the tip of the convex part 12 having a square frustum shape in the light control sheet 10B The flat surface portion 12a of this was optically bonded.
- the vertical angle of the convex part 12 having the isosceles trapezoidal shape in the X-direction cross section in the light control sheet 10B is the cross-section in the ⁇ 1, y-direction.
- the tip of the convex part 12 in the X direction of the light control sheet 10B is The ratio Dx of the length in the X direction of the portion where the flat portion 12a is bonded to the emission surface 21a of the surface light emitting element 20 and the flat portion 12a at the tip of the convex portion 12 in the y direction of the light control sheet 10B Is the ratio of the length in the y direction of the part bonded to the light emitting surface 21a of the surface light emitting element 20.At least one force with Dy 0.75>Dx> 4 [(si ⁇ ⁇ 1-1 / ⁇ ) 2 +0. 034], 0.75>Dy> 4 [(sin ⁇ 2- 1 / ⁇ ) 2 +0. 034]. Of course, both the above Dx and Dy forces may satisfy the above conditions.
- the output of the light control sheet 10B is performed.
- the front brightness of the light emitted from the light emitting surface 14 and in the range of ⁇ 15 ° from the front is greatly improved, and the front brightness is about 1.6 times or more compared to the case where the light control sheet 10B is not provided. Improved.
- the front luminance of the light emitted from the emission surface 14 of the light control sheet 10B is examined, and FIG.
- the part si to which the flat part 12a is bonded is shown in gray, and the part s2 with a higher front luminance than the part si to which the flat part 12a is bonded is white, and the part s2 to which the flat part 12a is bonded
- the part s3 is shown in black.
- the light emitting area S 0 of the surface light emitting element 20, that is, the area of the emission surface 21 a of the surface light emitting element 20, and the flat surface portion 12 a of the convex part 12 are the surface light emitting element 2.
- the light control sheet 10B used in the surface light emitting device according to the second embodiment includes the apex angle ⁇ 1 of the convex part 12 having an isosceles trapezoidal shape in the X direction and a cross section in the y direction.
- the apex angle of the convex part 12 that is an isosceles trapezoidal shape of ⁇ 2 may be the same angle or a different angle
- the light modulating sheet 10B a square frustum in which the flat surface 12a at the tip of the convex portion 12 is rectangular on one side of the light-transmitting substrate 11. It is also possible to use a ridge-shaped convex part 12 formed in the X direction and the y direction through the required intervals.
- the flat surface portion 12a at the tip of the convex portion 12 is rectangular on one side of the translucent substrate 11.
- the light-modulating sheet 10A in which the square frustum-shaped convex portions 12 thus formed were continuously formed in the X direction and the y direction of the translucent substrate 11 was used.
- the convex portion 12 has an isosceles trapezoidal shape in which the cross-sectional shape of the translucent substrate 11 in the X direction and the y direction is different in height and shape.
- the emission surface 21a of the transparent substrate 21 that emits the light emitted from the surface light-emitting element 20 is used. Further, the flat surface portion 12a at the tip of the convex portion 12 having a square frustum shape in the light control sheet 10C is optically bonded.
- the ratio of the length in the y direction of the portion where the flat portion 12a at the tip of the convex portion 12 is bonded to the emission surface 21a of the surface light emitting element 20 is at least one force with Dy 0.75>Dx> 4
- the conditions of [(sin 0 1 1 / ⁇ ) 2 +0. 034] and 0.75> D y> 4 [(sin 0 2-l / n) 2 + 0. 034] were satisfied.
- the above Dx and D It goes without saying that both y and the above conditions should be satisfied.
- the light control sheet 10B is the same as in the surface light-emitting devices of Embodiments 1 and 2.
- the front brightness of the light emitted from the light exit surface 14 and the front brightness in the range of ⁇ 15 ° from the front are greatly improved, and the front brightness is improved by about 1.6 times or more compared to the case where the light control sheet 10B is not provided. did.
- the part where the flat part 12a is adhered s
- the part where the beam also has low front luminance s3
- the light emitting area SO of the surface light emitting element 20 the area S1 of the portion where the flat surface portion 12a of the convex part 12 is bonded to the emission surface 21a of the surface light emitting element 20, and the above
- the area S2 of the portion of the front brightness higher than the flat surface portion 12a of the convex portion 12 bonded to the emission surface 21a is the same as in the case of the first and second embodiments described above. The condition was met.
- the light control sheet 10C used in the surface light emitting device of the third embodiment also has a cross section in the X direction, similar to the light control sheet 10B used in the surface light emitting device of the second embodiment. Even if the apex angle ⁇ 1 of the convex part 12 having the isosceles trapezoidal shape and the apex angle ⁇ 2 of the convex part 12 having the isosceles trapezoidal shape in the cross section in the y direction are the same angle, they are different. It may be of an angle.
- the surface light-emitting device of Embodiment 4 as a light control sheet, as shown in FIGS. 9 (A) and 9 (B), on one side of the light-transmitting substrate 11, isosceles with the same cross-sectional shape in the X and y directions.
- the trapezoidal convex part 12 having a trapezoidal shape and the flat part 12a at the tip of the convex part 12 having a circular shape is continuous so as to be in contact with each other in the X direction and the y direction of the translucent substrate 11.
- the light control sheet 10D formed in this way was used.
- the emission surface 21a of the transparent substrate 21 that emits the light emitted from the surface light-emitting element 20 is used.
- the tip of the convex part 12 having the frustum shape in the light control sheet 10D described above The flat portion 12a is optically bonded.
- the light control sheet 10D is the same as in the case of the surface light-emitting devices of Embodiments 1 to 3.
- the front brightness of the light emitted from the light exit surface 14 and within the range of ⁇ 15 ° from the front is greatly improved, and the front brightness is increased by about 1.6 times or more compared to the case where the light control sheet 10D is not provided. did.
- the front luminance of the light emitted from the emission surface 14 of the light control sheet 10D is examined, and FIG.
- the part where the flat part 12a is bonded is shown in gray, and the part where the flat part 12a is bonded s
- the part where the front brightness is high s2
- the part where the flat part 12a is bonded and the part s2 is white
- the brightness is low
- the part s3 is shown in black.
- the light emitting area S0 of the surface light emitting element 20, that is, the area of the emission surface 21a of the surface light emitting element 20, and the flat surface portion 12a of the convex part 12 are the surface light emitting element 2.
- the condition of 0.04SO ⁇ S1 ⁇ 1.4S2 was met.
- the frustum-shaped convex portions 12 each having a circular flat surface portion 12a are formed on each side. Will touch As shown in FIGS. 11 (A) and 11 (B), the flat portion 12a is circular on one side of the translucent substrate 11, as shown in FIGS. 11 (A) and 11 (B). It is also possible to use a light control sheet 10D ′ in which the frustum-shaped convex portion 12 having a shape is formed in the X direction and the y direction through the required intervals.
- one surface of the light-transmitting substrate 11 has the same cross section in the X direction and the Y direction.
- a trapezoidal shape in which the peripheral part of the truncated cone-shaped convex part 12 in which the flat part 12a at the tip of the convex part 12 is circular is cut into a square shape is the X of the translucent substrate 11
- the light control sheet 10E formed continuously in the direction and the y direction was used.
- the emission surface 21a of the transparent substrate 21 that emits the light emitted from the surface light emitting element 20 is used.
- the flat surface portion 12a at the tip of the convex portion 12 having a truncated cone shape in the light control sheet 10E is optically bonded.
- the light control sheet 10E is the same as in the surface light emitting devices of the first to fourth embodiments.
- the front brightness of the light emitted from the light exit surface 14 and within ⁇ 15 ° from the front is greatly improved, and the front brightness is improved by about 1.6 times or more compared to the case where the light control sheet 10E is not provided. did.
- the light control sheet 10E The front luminance of the light emitted from the light exit surface 14 is examined, and in FIG. 13, the portion si where the flat portion 12a at the tip of the convex portion 12 is bonded is shown in gray, and the portion s where the flat portion 12a is bonded s The part s2 where the front luminance of the beam is high is shown in white. Note that when this light control sheet 10E was used, the portion where the flat surface portion 12a was adhered to the s beam had no portion where the front luminance was low.
- the light emitting area S 0 of the surface light emitting element 20, that is, the area of the emission surface 21 a of the surface light emitting element 20 and the planar portion 12 a of the convex part 12 are the surface light emitting elements 2.
- the area S 1 of the portion bonded to the output surface 2 la of 0, that is, the total area of the portion si shown in gray in FIG. 13, and the flat portion 12a of the convex portion 12 bonded to the output surface 21a described above When the relationship between the area S2 of the portion with higher front luminance, that is, the total area of the portion s2 shown in white in FIG. 13 is examined, as in the case of Embodiments 1 to 4 above, 0.04SO ⁇ S1 ⁇ 1. 4S2 was satisfied.
- the cross-sectional shape in the X direction and the y direction is an isosceles table on one side of the translucent substrate 11.
- the flat part 12a at the tip of the convex part 12 has a circular shape, and the peripheral part of the frustum-shaped convex part 12 is cut into a hexagonal shape.
- the light control sheet 10F arranged in a shape was used.
- the emission surface 21a of the transparent substrate 21 that emits the light emitted from the surface light-emitting element 20 is used.
- the flat surface portion 12a at the tip of the convex portion 12 having a frustum shape in the light control sheet 10F is optically bonded.
- the light control sheet 10F described above is used.
- the front brightness of the light emitted from the light exit surface 14 and within the range of ⁇ 15 ° from the front is greatly improved, and the front brightness is improved by about 1.6 times or more compared to the case where the light control sheet 10F is not provided. did.
- FIG. 15 shows the tip of the projection 12
- the part where the flat part 12a is bonded is shown in gray, and the part where the flat part 12a is bonded s
- the part where the front brightness is high s2
- the part where the flat part 12a is bonded and the part s2 is white
- the brightness is low
- the part s3 is shown in black.
- the light emitting area S0 of the surface light emitting element 20, that is, the area of the emission surface 21a of the surface light emitting element 20, and the flat surface portion 12a of the convex part 12 are the surface light emitting element 2.
- the area S 1 of the portion bonded to the output surface 2 la of 0, that is, the total area of the portion si shown in gray in FIG. 15, and the flat portion 12a of the convex portion 12 bonded to the output surface 21a described above When the relationship between the area S2 of the portion with higher front luminance, that is, the total area of the portion s2 shown in white in FIG. 15 is investigated, as in the case of Embodiments 1 to 5 above, 0.04SO ⁇ S1 ⁇ 1. 4S2 was satisfied.
- the inverted quadrangular concavity 15 is formed in one side of the translucent substrate 11 in the X direction and the y direction.
- the dimming sheet 10G is provided with a convex portion 12 provided in the X direction and the y direction, with the cross-sectional shapes in the X direction and the y direction being isosceles trapezoidal shapes. I made it.
- the emission surface 21a of the transparent substrate 21 that emits the light emitted from the surface light emitting element 20 is used.
- the flat portion 12a on the tip side of the convex portion 12 of the translucent substrate 11 in which the concave portion 15 in the light control sheet 10G is not formed is optically bonded.
- the surface light emitting device 20 of the seventh embodiment causes the surface light emitting element 20 to emit light
- the above adjustment is performed.
- the front brightness of the light emitted from the light exit surface 14 of the light sheet 10G is greatly improved in the range of ⁇ 15 ° from the front and front, and the front brightness is about 1.6 compared to when the light control sheet 10G is not provided. More than doubled.
- FIG. A portion si where the flat surface portion 12a on the front end side of the convex portion 12 is bonded is shown in gray, and a portion s2 where the flat surface portion 12a is bonded is also shown in white.
- this light control sheet 10G was used, the portion s beam to which the flat portion 12a was bonded did not have a portion with low front luminance.
- the light emitting area S0 of the surface light emitting element 20, that is, the area of the emission surface 21a of the surface light emitting element 20, and the flat surface portion 12a of the convex part 12 are the surface light emitting element 2.
- the area S2 of this portion that is, the total area of the portion s2 shown in white in FIG. 17 is examined, as in the case of Embodiments 1 to 6 described above, 0.04SO ⁇ S1 ⁇ 1. Meet 4S2 requirements.
- the surface light emitting device according to the example of the present invention and the surface light emitting device of the comparative example were compared, and In the surface light emitting device according to the embodiment of the present invention, it is clarified that the front luminance of the light emitted from the surface light emitting device is greatly improved.
- the surface light-emitting element 20 was used as it was without providing a light control sheet for the surface light-emitting element 20.
- 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 that also has the organic EL element power produced was used.
- the transparent substrate 21 in the surface light emitting element 20 had a refractive index of 1.517 with respect to light having a wavelength of 550 nm.
- the surface light emitting element 20 is caused to emit light, and the light distribution characteristic of the light emitted from the emission surface 21a of the transparent substrate 21 is examined. The result is shown in FIG.
- the maximum front luminance in the range of ⁇ 15 ° from the front in the emitted light is shown as 1.
- the light control sheet 10A had a thickness of 120 / zm and a refractive index of 1.495 for light having a wavelength of 550 nm.
- the surface light emitting element 20 is caused to emit light, and light emitted from the emission surface 14 of each light control sheet 10A.
- the results of Example 1 are shown in FIG. 19, the results of Example 2 are shown in FIG. 20, the results of Example 3 are shown in FIG. 21, the results of Example 4 are shown in FIG. Fig. 23 shows the results of Fig. 23, Fig. 24 shows the results of Example 6, Fig. 25 shows the results of Comparative Example 2, Fig. 26 shows the results of Comparative Example 3, and outputs from the exit surface 14 of each light control sheet 10A.
- the maximum front luminance in the range of ⁇ 15 ° from the front in the measured light is obtained as the relative luminance when the maximum front luminance in Comparative Example 1 is 1, and the results are shown in FIGS. It is shown in Table 1 below.
- the same surface light-emitting element 20 as in Comparative Example 1 was used, and the light control sheet 10B shown in Embodiment 2 was used.
- the light control sheet 10B had a thickness of 120 m and a refractive index of 1.495 for light having a wavelength of 550 nm.
- the vertical angle ⁇ of the convex portion 12 having an isosceles trapezoidal shape in the cross section in the X direction in each light control sheet 10B. 1 and the y-direction isosceles trapezoidal convex part 12 apex angle ⁇ 2 is set to the same angle of 50 °, while the above-mentioned dimming sheet 10B has convex part 12 in the X direction, y
- the pitch in the direction the ratio of the length of the portion where the projection 12 is in close contact with the emission surface 21a of the surface light emitting element 20 in the X direction and the y direction of the arrangement of the projections 12 (Dx, Dy) and the ratio S1ZS0 of the area S1 of the convex portion 12 in close contact with the emission surface la of the surface light emitting element 20 to the light emitting area SO of the surface light emitting element 20 were changed as shown in the table.
- the surface light emitting element 20 is caused to emit light, and the light distribution characteristics of the light emitted from the emission surface 14 of each light control sheet 10B are determined.
- the result of Example 7 is shown in FIG. 27
- the result of Example 8 is shown in FIG. 28, and the maximum positive in the range ⁇ 15 ° from the front in the light emitted from the exit surface 14 of each light control sheet 10B.
- the surface luminance was determined as the relative luminance when the maximum front luminance of Comparative Example 1 was 1, and the results are shown in FIGS. 27 and 28 and Table 2 below.
- the light distribution characteristic in the X direction is indicated by a solid line
- the light distribution characteristic in the y direction is indicated by a broken line.
- Example 10B 87.2 40.0 50. 0.683 0.310 0.1738 0.212 57.0 0.37 1.93
- Example 8 18.4 40.0 50 ° 0.311 0.683 0.1738 0.212 56.9 0.37 1.85
- Z 4 [(sin 0-1 / n) 2 + 0. 034]
- each of the surface light emitting devices of Examples 7 and 8 described above also has a 0.75 in the present invention.
- the same surface light-emitting element 20 as in Comparative Example 1 was used, and the light control sheet 10C shown in Embodiment 3 was used.
- the light control sheet 10C had a thickness of 120 m and a refractive index of 1.495 for light having a wavelength of 550 nm.
- the pitches in the X direction and the y direction of the convex portions 12 in each light control sheet 10C are 40.
- O / zm and the vertical angle ⁇ 1 of the convex part 12 with the isosceles trapezoidal shape in the cross section in the X direction is the same as the vertical angle ⁇ 2 of the convex part 12 with the isosceles trapezoidal shape in the cross section in the y direction.
- the surface light emitting element 20 is caused to emit light, and the light emitted from the light emitting surface 14 of each light control sheet 10C is emitted.
- the light distribution characteristics were examined.
- the results of Example 9 are shown in FIG. 29, the results of Example 10 are shown in FIG. 31 shows the results of Example 12, FIG. 32 shows the results of Example 12, FIG. 33 shows the results of Example 13, and FIG. 34 shows the results of Comparative Example 4.
- the light is emitted from the exit surface 14 of each light control sheet 10C.
- the maximum front brightness in the range of ⁇ 15 ° from the front in the measured light is obtained as the relative brightness when the maximum front brightness in Comparative Example 1 is set to 1, and the results are shown in FIGS. 29 to 34 and above. It is shown in Table 3 below.
- the light distribution characteristics in the X direction are indicated by solid lines and the light distribution characteristics in the y direction are indicated by broken lines.
- each of the surface light emitting devices of Examples 9 to 13 described above also has a 0.
- the maximum front luminance was higher than that of the surface light emitting device of Comparative Example 1, but when compared to the surface light emitting devices of Examples 9 to 13, The increase in maximum front brightness was decreasing.
- Example 14 In the surface light-emitting device of Example 14, the same surface light-emitting element 20 as that of Comparative Example 1 was used, and the light control sheet 10D shown in Embodiment 4 was used. This light control sheet 10D has a thickness of 120 ⁇ and a refractive index of 1.495 for light with a wavelength of 550 nm.
- Example 14 As shown in Table 4 below, the apex angle ⁇ of the convex portion 12 in the light control sheet 10D is 50 °, and the X direction and y direction of the convex portion 12 are D (Dx, Dy) is the ratio of the length of the portion where the convex portion 12 is in close contact with the emission surface 2 la of the surface light emitting element 20 in the X direction and the y direction in the arrangement direction of the convex portion 12 with a pitch of 40.0 m.
- the surface light-emitting element 20 is caused to emit light, and the light distribution characteristics of the light emitted from the emission surface 14 of the light control sheet 10D are examined.
- the results are shown in FIG. 35, and when the maximum front luminance in the range of ⁇ 15 ° from the front in the light emitted from the emission surface 14 of the light control sheet 10D is set to 1, the maximum front luminance in the above Comparative Example 1 is 1.
- the relative luminance was calculated as shown in FIG. 35 and Table 4 below.
- the same surface light-emitting element 20 as that in Comparative Example 1 was used, and the light control sheet 10E shown in Embodiment 5 was used.
- the light control sheet 10E had a thickness of 120 m and a refractive index of 1.495 for light having a wavelength of 550 nm.
- the pitches of the convex portions 12 in each light control sheet 10E are 40. O / zm. Then, while setting the apex angle ⁇ of the convex portion 12 to 50 °, the height of the convex portion 12 in each light control sheet 10E is changed, and the X direction of the arrangement direction of the convex portions 12 and In the y-direction, the surface light emitting element 20 with respect to the ratio D (Dx, Dy) of the length of the portion where the convex portion 12 is in close contact with the emission surface 21a of the surface light emitting element 20 and the light emitting area SO of the surface light emitting element 20
- the ratio S1ZS0 of the area S1 of the convex portion 12 in close contact with the emission surface la was changed as shown in the table.
- the value of 4 [(sin 0-1 / ⁇ ) 2 +0.0.34] Z in each light control sheet 10E was 0.1738.
- Example 15 the surface light emitting element 20 is caused to emit light, and the light distribution characteristics of the light emitted from the emission surface 14 of each light control sheet 10E are examined.
- the results of Example 15 are shown in FIG. 36
- the results of Example 16 are shown in FIG. 37
- the results of Example 17 are shown in FIG. 38
- the front surface of the light emitted from the exit surface 14 of each light control sheet 10E is shown.
- the maximum front luminance in the range of ⁇ 15 ° from the above is obtained as the relative luminance when the maximum front luminance in Comparative Example 1 is 1, and the results are shown in FIGS. 36 to 38 and Table 5 below. .
- the same surface light-emitting element 20 as that in Comparative Example 1 was used, and the light control sheet 10F shown in Embodiment 6 was used.
- the light control sheet 10F had a thickness of 120 ⁇ and a refractive index of 1.495 for light having a wavelength of 550 nm.
- the ratio S1ZS0 of S1 was changed as shown in the table.
- the value of 4 [(sin0-l / n) 2 +0.03] Z in each light control sheet 10F was 0.1738.
- Example 18 the surface light-emitting element 20 is caused to emit light, and the light distribution characteristics of the light emitted from the emission surface 14 of each light control sheet 10F are examined.
- FIG. 39 the result of Example 18 is shown in FIG. 39
- the result of Example 19 is shown in FIG. 40
- the result of Example 20 is shown in FIG. 41
- the result of Example 21 is shown in FIG.
- the maximum front luminance in the range of ⁇ 15 ° from the front in the light emitted from 14 is obtained as the relative luminance when the maximum front luminance of Comparative Example 1 is 1, and the result is shown in FIGS. And in Table 6 below.
- the same surface light-emitting element 20 as in Comparative Example 1 was used, and the light control sheet 10G shown in Embodiment 6 was used.
- the light control sheet 10G had a thickness of 120 m and a refractive index of 1.495 for light having a wavelength of 550 nm.
- Example 22 in the light control sheet 10G, the apex angle ⁇ of the convex portion 12 is 45 °, and the pitch of the convex portion 12 in the X direction and the y direction is 40.
- convex In the x direction and y direction of the arrangement direction of the portion 12 D (Dx, Dy) of the length ratio of the portion where the convex portion 12 is in close contact with the emission surface 2 la of the surface light emitting element 20 is 0.354
- surface emission The ratio of the area S1 of the convex portion 12 that is in close contact with the emission surface la of the surface light emitting element 20 with respect to the light emitting area SO of the element 20 is set to 0.582, and in Example 23, the light control sheet 10G
- the apex angle ⁇ of the convex part 12 is 50 °
- the pitch of the convex part 12 in the X direction and y direction is 40.O ⁇ m
- the convex part 12 is the surface in the X
- D (Dx, Dy) of the ratio of the length of the portion closely attached to the emission surface 21a of the light emitting element 20 is 0.179, and the emission area SO of the surface light emitting device 20 is in close contact with the emission surface la of the surface light emitting device 20.
- the ratio S1ZS0 of the area S1 of the projected portion 12 was set to 0.326.
- Example 22 is shown in FIG. 44
- the result of Example 23 is shown in FIG. 45
- the result of Example 24 is shown in FIG. 46
- the result of Example 25 is shown in FIG.
- the maximum front brightness in the range of ⁇ 15 ° from the front of the light emitted from the exit surface 14 of 10G and 10G ' is obtained as the relative brightness when the maximum front brightness in the above Comparative Example 1 is set to 1. Up These are shown in FIGS. 44 to 47 and Table 7 below.
- FIG. 1 In the light control sheet used in the surface light emitting device of Embodiment 1 of the present invention, a schematic plan view of the surface provided with the convex portions and the arrangement state of the convex portions in the X direction of the light control sheet FIG.
- FIG. 2 is a schematic side view showing the surface light emitting device according to Embodiment 1 described above.
- FIG. 3 is a partially enlarged explanatory view of the surface light emitting device according to Embodiment 1 described above.
- FIG. 4 is a schematic explanatory diagram showing a front luminance distribution state of light emitted from the light-emitting surface of the light control sheet when the surface light emitting device according to the first embodiment emits light.
- FIG. 5 is a schematic plan view of a surface provided with a convex portion in the modification of the light control sheet used in the surface light emitting device of Embodiment 1 described above, and the X direction of the convex portion provided on the light control sheet. It is a schematic explanatory diagram showing the arrangement state.
- FIG. 2 is a schematic plan view of a provided surface, a schematic explanatory diagram showing an arrangement state of convex portions in the X direction of the light control sheet, and a schematic explanatory diagram showing an arrangement state of convex portions in the y direction of the light control sheet. .
- FIG. 7 is a schematic explanatory view showing a front luminance distribution state of light emitted from the light-emitting surface force of the light control sheet when the surface light emitting device according to the second embodiment emits light.
- FIG. 8 In the light control sheet used in the surface light emitting device of Embodiment 3 of the present invention, a schematic plan view of the surface provided with the convex portions, and a schematic diagram showing the arrangement state of the convex portions in the X direction of the light control sheet It is explanatory drawing and the schematic explanatory drawing which showed the arrangement
- FIG. 10 is a schematic explanatory view showing a front luminance distribution state of light emitted from the light-emitting surface of the light control sheet when the surface light emitting device according to Embodiment 4 is caused to emit light.
- FIG. 11 In the modification of the light control sheet used in the surface light emitting device of Embodiment 4, the schematic plan view of the surface provided with the convex portion and the arrangement of the convex portion provided on the light control sheet in the X direction It is the schematic explanatory drawing which showed the column state.
- FIG. 13 is a schematic explanatory diagram showing a front luminance distribution state of light emitted from the light-emitting surface force of the light control sheet when the surface light emitting device according to Embodiment 5 is caused to emit light.
- a schematic plan view of the surface provided with the convex portions and a schematic diagram showing the arrangement state of the convex portions in the X direction of the light control sheet Schematic showing explanatory state and arrangement state of convex parts in y direction of this light control sheet It is explanatory drawing.
- FIG. 15 is a schematic explanatory diagram showing a front luminance distribution state of light emitted from the light-emitting surface force of the light control sheet when the surface light emitting device according to Embodiment 6 is caused to emit light.
- a schematic plan view of the surface provided with the convex portions and a schematic diagram showing the arrangement state of the convex portions in the X direction of the light control sheet It is sectional drawing.
- FIG. 17 is a schematic explanatory view showing a front luminance distribution state of light emitted from the light-emitting surface force of the light control sheet when the surface light emitting device according to Embodiment 7 is caused to emit light.
- FIG. 18 is a view showing the light distribution characteristics of the surface light emitting device of Comparative Example 1.
- FIG. 19 is a view showing the light distribution characteristics of the surface light emitting device of Example 1.
- FIG. 20 is a view showing the light distribution characteristics of the surface light emitting device of Example 2.
- FIG. 22 is a view showing the light distribution characteristics of the surface light emitting device of Example 4.
- FIG. 23 is a view showing the light distribution characteristics of the surface emitting device of Example 5.
- FIG. 27 A graph showing the light distribution characteristics of the surface emitting device of Example 7.
- FIG. 29 A graph showing the light distribution characteristics of the surface light emitting device of Example 9.
- FIG. 30 is a view showing the light distribution characteristics of the surface emitting device of Example 10.
- FIG. 32 is a diagram showing the light distribution characteristics of the surface light emitting device of Example 12.
- FIG. 33 A graph showing light distribution characteristics of the surface emitting device of Example 13.
- ⁇ 35 A graph showing the light distribution characteristics of the surface emitting device of Example 14.
- ⁇ 36 A graph showing the light distribution characteristics of the surface emitting device of Example 15.
- FIG. 37 A graph showing the light distribution characteristics of the surface emitting device of Example 16.
- FIG. 39 A graph showing the light distribution characteristics of the surface emitting device of Example 18.
- FIG. 40 A graph showing the light distribution characteristics of the surface emitting device of Example 19.
- FIG. 41 A graph showing the light distribution characteristics of the surface emitting device of Example 20.
- FIG. 42 shows the light distribution characteristics of the surface emitting device of Example 21.
- FIG. 3 is a schematic cross-sectional view showing an arrangement state of protrusions provided in the light control sheet in the X direction.
- FIG. 44 is a view showing the light distribution characteristics of the surface emitting device of Example 22.
- FIG. 47 A graph showing the light distribution characteristics of the surface emitting device of Example 25.
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Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US12/294,513 US8123391B2 (en) | 2006-08-17 | 2007-07-05 | Surface light emitter |
JP2008529831A JP4803258B2 (ja) | 2006-08-17 | 2007-07-05 | 面発光装置 |
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JP2006222527 | 2006-08-17 | ||
JP2006-222527 | 2006-08-17 |
Publications (1)
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WO2008020514A1 true WO2008020514A1 (fr) | 2008-02-21 |
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PCT/JP2007/063421 WO2008020514A1 (fr) | 2006-08-17 | 2007-07-05 | Appareil émetteur de lumière en surface |
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US (1) | US8123391B2 (ja) |
JP (1) | JP4803258B2 (ja) |
WO (1) | WO2008020514A1 (ja) |
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JP2020515867A (ja) * | 2017-04-06 | 2020-05-28 | ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツングRobert Bosch Gmbh | 光伝送素子、受光ユニット、光アクチュエータユニット、lidarシステム、作業装置および車両 |
US11480663B2 (en) | 2017-04-06 | 2022-10-25 | Robert Bosch Gmbh | Light transmission element, optical receiving unit, optical actuator unit, LIDAR system, working device and vehicle |
CN107748468A (zh) * | 2017-11-30 | 2018-03-02 | 青岛海信电器股份有限公司 | 液晶显示装置 |
WO2021241148A1 (ja) * | 2020-05-23 | 2021-12-02 | ソニーセミコンダクタソリューションズ株式会社 | 表示装置及び電子機器 |
JP7389296B1 (ja) | 2022-05-27 | 2023-11-29 | 恵和株式会社 | 光拡散シート、バックライトユニット、液晶表示装置、情報機器、及び光拡散シートの製造方法 |
WO2023228983A1 (ja) * | 2022-05-27 | 2023-11-30 | 恵和株式会社 | 光拡散シート、バックライトユニット、液晶表示装置、情報機器、及び光拡散シートの製造方法 |
JP2023174578A (ja) * | 2022-05-27 | 2023-12-07 | 恵和株式会社 | 光拡散シート、バックライトユニット、液晶表示装置、情報機器、及び光拡散シートの製造方法 |
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US8123391B2 (en) | 2012-02-28 |
US20110019426A1 (en) | 2011-01-27 |
JP4803258B2 (ja) | 2011-10-26 |
JPWO2008020514A1 (ja) | 2010-01-07 |
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