WO2015141304A1 - 発光装置および表示装置 - Google Patents
発光装置および表示装置 Download PDFInfo
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- WO2015141304A1 WO2015141304A1 PCT/JP2015/052944 JP2015052944W WO2015141304A1 WO 2015141304 A1 WO2015141304 A1 WO 2015141304A1 JP 2015052944 W JP2015052944 W JP 2015052944W WO 2015141304 A1 WO2015141304 A1 WO 2015141304A1
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- light
- pattern
- guide plate
- light guide
- incident surface
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
- G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
- G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0073—Light emitting diode [LED]
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0075—Arrangements of multiple light guides
- G02B6/0076—Stacked arrangements of multiple light guides of the same or different cross-sectional area
Definitions
- the present disclosure relates to a light emitting device and a display device including the light emitting device.
- a light emitting device that emits light emitted from a light source using a light guide plate.
- a light emitting device for example, as described in Patent Documents 1 and 2, a plurality of point light sources such as a light emitting diode (LED) and a laser diode (laser diode) are arranged on the side surface of the light guide plate.
- LED light emitting diode
- laser diode laser diode
- the light emitting device As described above, it is desired to reduce luminance unevenness or color unevenness in the light emitting surface.
- the directivity becomes strong, so that uneven brightness or uneven color tends to occur.
- each light guide plate is provided with an emission promoting portion, for example, a hemispherical convex portion, for emitting light from a point light source incident from the side surface direction from the surface of the light guide plate.
- the emission facilitating portion provided in each light guide plate is provided in about a half region in each light guide plate, and is provided in a pattern that does not substantially overlap each other when viewed from the surface of each light guide plate. For this reason, reduction in luminance unevenness or color unevenness is insufficient.
- a light emitting device includes a first light incident surface, a first light emitting surface that emits light in a predetermined light emitting direction, and a first pattern.
- a first light guide plate having a first light emission promoting surface, a second light incident surface, a second light emission surface for emitting light in the light emission direction, and a second pattern.
- a second light guide plate having a second light emission promoting surface and disposed opposite to the first light guide plate.
- the first pattern is a pattern composed of a plurality of first point-like portions whose arrangement pitch changes so that the density increases as the distance from the first light incident surface increases.
- the second pattern is the second pattern.
- the regions where the first pattern and the second pattern are provided partially overlap, and the directions in which the density increases between the first pattern and the second pattern are opposite to each other. It is facing.
- a display device includes a display panel and a light emitting device that illuminates the display panel, and includes the light emitting device according to the embodiment of the present disclosure as the light emitting device. .
- a pattern optimized to reduce luminance unevenness or color unevenness is provided on each of the two light guide plates arranged to face each other.
- the optimized pattern is provided to reduce the luminance unevenness or the color unevenness on each of the two light guide plates arranged to face each other. As a result, luminance unevenness or color unevenness can be reduced. Note that the effects described here are not necessarily limited, and may be any of the effects described in the present disclosure.
- FIG. 1 It is a perspective view showing an example of 1 composition of a light emitting device concerning a 1st embodiment of this indication. It is sectional drawing which shows one structural example of the light-emitting device which concerns on 1st Embodiment. It is a top view which shows one structural example of the light-guide plate and light source in the light-emitting device which concerns on 1st Embodiment. It is a top view which shows an example of a dot pattern. It is a top view which shows the 1st example of arrangement
- FIG. 10 is a characteristic diagram comparing luminance distributions in the Y direction between Comparative Example 1 and Example 1. 6 is a plan view showing an in-plane luminance distribution of Comparative Example 1.
- FIG. 3 is a plan view showing an in-plane luminance distribution of Example 1.
- FIG. 10 is a plan view showing a dot pattern of an upper light guide plate of Comparative Example 2.
- FIG. 6 is a plan view showing a dot pattern of an upper light guide plate in Example 1.
- FIG. FIG. 6 is a characteristic diagram comparing luminance distributions in the Y direction between Comparative Example 2 and Example 1.
- 10 is a plan view showing an in-plane luminance distribution of Comparative Example 2.
- FIG. 10 is a characteristic diagram illustrating a luminance distribution in the X direction according to Example 2.
- 10 is a plan view showing an in-plane luminance distribution of Example 2.
- FIG. 6 is a plan view showing a light source arrangement in an upper light guide plate of Example 2.
- FIG. 6 is a plan view showing a light source arrangement in a lower light guide plate of Example 2.
- FIG. 10 is a characteristic diagram illustrating a luminance distribution in the X direction according to Example 3.
- FIG. 6 is a plan view illustrating an in-plane luminance distribution of Example 3.
- FIG. It is a top view which shows the light source arrangement
- FIG. It is a top view which shows light source arrangement
- FIG. It is the characteristic view which compared the luminance distribution of the Y direction of Example 3,4,5. It is the characteristic view which compared the luminance distribution of the normalized Y direction of Example 3, 4, and 5.
- FIG. It is the characteristic view which compared the luminance distribution of the normalized Y direction of Example 3, 4, and 5.
- FIG. It is the characteristic view which compared the luminance distribution of the normalized Y direction of Example 3, 4, and 5.
- FIG. 10 is a characteristic diagram illustrating a luminance distribution in the X direction according to Example 4.
- FIG. 10 is a plan view showing an in-plane luminance distribution of Example 5.
- FIG. 10 is a characteristic diagram illustrating a luminance distribution in the X direction according to Example 5. It is a top view which shows the in-plane luminance distribution of the upper stage light-guide plate of Example 3.
- FIG. It is a characteristic view which shows the luminance distribution of the X direction of the upper stage light-guide plate of Example 3.
- 6 is a plan view schematically showing a luminance distribution of Example 3.
- FIG. It is a top view which shows the in-plane luminance distribution of the upper stage light-guide plate of Example 4.
- FIG. 10 is a plan view schematically showing a luminance distribution of Example 5. It is sectional drawing which shows one structural example of the light-emitting device which concerns on 2nd Embodiment. It is a top view which shows one structural example of the light-guide plate and light source in the light-emitting device which concerns on 2nd Embodiment.
- FIG. 3 is a front view, a left side view, a right side view, a top view, and a bottom view showing the appearance of the cellular phone in a closed state. It is the front view and side view showing the external appearance of the open state of a mobile telephone.
- First Embodiment> (FIGS. 1 to 42) [1.1 Basic configuration example of light emitting device] [1.2 Example of dot pattern and light source configuration] [1.3 Action and Effect (Example)] ⁇ 2.
- Second Embodiment> (Light-Emitting Device Using Only Blue Light Source) (FIGS. 43 to 46) ⁇ 3.
- Third Embodiment> (Example in which a light source is arranged on the side surface in the X direction) (FIG. 47) ⁇ 4.
- Fourth Embodiment> (Example of Application to Display Device) (FIGS. 48 to 58) ⁇ 5.
- Other Embodiments> (FIGS. 1 to 42) [1.1 Basic configuration example of light emitting device] [1.2 Example of dot pattern and light source configuration] [1.3 Action and Effect (Example)] ⁇ 2.
- Second Embodiment> (Light-Emitting Device Using Only Blue Light Source) (FIGS. 43 to 46) ⁇ 3.
- Third Embodiment> (Example
- FIG. 1 illustrates an overall configuration of a light emitting device (backlight unit 1) according to a first embodiment of the present disclosure.
- FIG. 2 shows a cross-sectional configuration of the backlight unit 1.
- the backlight unit 1 illuminates, for example, a transmissive liquid crystal panel from the back, and includes a first light source 10-1, a second light source 10-2, a lower light guide plate 11A, an upper light guide plate 11B, and a reflection sheet. 12 and the optical sheet 13.
- the “lower light guide plate 11A” corresponds to a specific example of “first light guide plate” in the present disclosure.
- the “upper light guide plate 11B” corresponds to a specific example of “second light guide plate” in the present disclosure.
- Each of the first light source 10-1 and the second light source 10-2 is a point light source, and specifically includes a laser diode (semiconductor laser).
- a laser diode for example, a laser diode that emits red, green, or blue color light is used.
- a plurality of first light sources 10-1 are provided in parallel to face the light incident surface (first light incident surface) of the lower light guide plate 11A.
- a plurality of second light sources 10-2 are provided in parallel so as to face the light incident surface (second light incident surface) of the upper light guide plate 11B.
- the first light source 10-1 and the second light source 10-2 may be light emitting diodes (LEDs), and a plurality of first light sources 10-1 and second light sources 10- In 2, a laser diode and a light emitting diode may be mixed.
- Both the lower light guide plate 11A and the upper light guide plate 11B are, for example, plate-like (flat rectangular parallelepiped) optical members.
- the lower light guide plate 11A has a first light incident surface and a first light exit surface, and guides light incident from the first light entrance surface to the first light exit surface.
- the upper light guide plate 11B has a second light incident surface and a second light emitting surface, and guides light incident from the second light incident surface to the second light emitting surface.
- the lower light guide plate 11A further has a first light emission promoting surface provided with a first dot pattern 30-1 to be described later.
- the upper light guide plate 11B further has a second light emission promoting surface provided with a second dot pattern 30-2 to be described later.
- Each of the lower light guide plate 11A and the upper light guide plate 11B mainly includes a transparent thermoplastic resin such as polycarbonate resin (PC) or acrylic resin (for example, PMMA (polymethyl methacrylate)).
- the lower light guide plate 11A and the upper light guide plate 11B are disposed to face each other in the Z direction, for example, and the light emitted from the lower light guide plate 11A and the upper light guide plate 11B is superimposed on the light emitted from the backlight unit 1.
- a luminance distribution is formed. Light is emitted from the first light emission surface and the second light emission surface in the Z direction as a predetermined light emission direction.
- the reflection sheet 12 is a plate-like or sheet-like member provided facing the back surface of the lower light guide plate 11A (the second main surface S13 facing the second light emitting surface), and the lower light guide plate 11A (or The light leaking from the upper light guide plate 11B) is returned toward the lower light guide plate 11A.
- the reflection sheet 12 has, for example, functions such as reflection, diffusion, and scattering, so that the light from the first light source 10-1 and the second light source 10-2 is efficiently used, and the front surface The brightness can be increased.
- the reflection sheet 12 is made of, for example, foamed PET (polyethylene terephthalate), a silver deposited film, a multilayer film, or white PET.
- the surface of the reflection sheet 12 is preferably subjected to a treatment such as silver vapor deposition, aluminum vapor deposition, or multilayer film reflection.
- the reflection sheet 12 may be integrally formed by a technique such as hot press molding using a thermoplastic resin or melt extrusion molding, and for example, PET It may be formed by applying an energy ray (for example, ultraviolet ray) curable resin on a substrate made of, for example, and then transferring the shape to the energy ray curable resin.
- an energy ray for example, ultraviolet ray
- thermoplastic resin examples include polycarbonate resins, acrylic resins such as PMMA (polymethyl methacrylate resin), polyester resins such as polyethylene terephthalate, and amorphous copolymers such as MS (copolymer of methyl methacrylate and styrene).
- examples thereof include a polymerized polyester resin, a polystyrene resin, and a polyvinyl chloride resin.
- the substrate when transferring the shape to an energy ray (for example, ultraviolet ray) curable resin, the substrate may be glass.
- the optical sheet 13 is provided to face the first light exit surface of the upper light guide plate 11B, and includes, for example, a diffusion plate, a diffusion sheet, a lens film, a polarization separation sheet, and the like. By providing such an optical sheet 13, it is possible to raise the light emitted in an oblique direction from the upper light guide plate 11 ⁇ / b> B in the front direction, and to further increase the front luminance.
- FIG. 3 shows an arrangement configuration in the XY plane of the lower light guide plate 11A and the upper light guide plate 11B, and the first light source 10-1 and the second light source 10-2.
- the lower light guide plate 11A has a first main surface S12 and a second main surface S13.
- the upper light guide plate 11B has a first main surface S22 and a second main surface S23.
- first side surface S1 is the first light incident surface
- main surface S12 surface facing the upper light guide plate 11B
- the other main surface S13 is a first light emission promoting surface provided with the first dot pattern 30-1.
- one side surface (second side surface S2) is the second light incident surface
- one main surface S22 (surface facing the optical sheet 13) is the second light emitting surface. It has become.
- the light emitting surface of the upper light guide plate 11B constitutes the light emitting surface of the entire light guide unit.
- Another main surface S23 is a second light emission promoting surface provided with the second dot pattern 30-2.
- the lower light guide plate 11A and the upper light guide plate 11B are stacked so that the first light incident surface and the second light incident surface do not overlap in the Z direction.
- the first light incident surface of the lower light guide plate 11A is provided on one of the two side surfaces (for example, the first side surface S1) corresponding to the long side of the XY planar shape (for example, rectangular shape).
- the second light incident surface of the upper light guide plate 11B is provided on the other of the two side surfaces corresponding to the rectangular long side (for example, the second side surface S2).
- a plurality of first light sources 10-1 are arranged facing the first light incident surface of the lower light guide plate 11A and along one direction.
- a plurality of second light sources 10-2 are arranged facing the second light incident surface of the upper light guide plate 11B and along one direction.
- the first light source 10-1 and the second light source 10-2 emit light in opposite directions as viewed from the light emission direction (Z direction), and the lower light guide plate 11A And the light of mutually opposite direction injects into the upper stage light-guide plate 11B.
- the first dot pattern 30-1 is provided so as to cover a region exceeding half of the first light emission promoting surface of the lower light guide plate 11A.
- the second dot pattern 30-2 is provided so as to cover a region exceeding half of the second light emission promoting surface of the upper light guide plate 11B.
- FIG. 4 schematically shows the second dot pattern 30-2 of the upper light guide plate 11B, but the direction in which the pattern density increases is also reversed for the first dot pattern 30-1 of the lower light guide plate 11A. Except for this, the configuration is substantially the same.
- the lower light guide plate 11A has a first dot pattern 30-1 in which fine dots 31 as first dot-like portions are provided on the first light emission promoting surface.
- the upper light guide plate 11B is substantially the same, and has a second dot pattern 30-2 in which dots 31 as second dot-like portions are provided on the second light emission promoting surface.
- the first dot pattern 30-1 and the second dot pattern 30-2 are formed of white dot patterns that are silk-screen printed using, for example, white ink.
- a convex or concave pattern corresponding to the dot 31 may be formed by laser processing.
- the lower light guide plate 11A is configured such that the density of the dots 31 in the first dot pattern 30-1 changes according to the distance from the light incident surface.
- the upper light guide plate 11B is configured such that the density of the dots 31 in the second dot pattern 30-2 changes according to the distance from the light incident surface.
- the density of the dots 31 increases as the distance from the light incident surface increases (decreases as the distance from the light incident surface decreases).
- the density of the dots 31 increases as the distance from the light incident surface increases (decreases as the distance from the light incident surface decreases).
- the first dot pattern 30-1 and the second dot pattern 30-2 have opposite density directions as viewed from the light emission direction. .
- the dot density can be changed stepwise by changing the number, pitch, size, and the like of the dots 31 for each region.
- the first dot pattern 30-1 and the second dot pattern 30-2 are preferably changed in density by changing both the arrangement pitch (dot pitch) and size (dot size) of the dots 31. .
- the dot pitch Xp1 in the X direction and the dot pitch Yp1 in the Y direction in the portion having a relatively low density the dot pitch Xp2 in the X direction and the dot pitch Yp2 in the Y direction in the portion having a relatively high density. It is good to make it smaller.
- FIG. 5 shows a first example of the arrangement of the light sources 10.
- Each of the first light source 10-1 and the second light source 10-2 includes a red light source 10R that emits red light, a green light source 10G that emits blue light, and a blue light source 10B that emits green light. You may go out. White light may be generated by mixing these color lights.
- each of the first light source 10-1 and the second light source 10-2 may constitute one light source unit 10U for each predetermined number.
- one red light source 10R, one green light source 10G, and one blue light source 10B constitute one light source unit 10U.
- FIG. 5 shows a first example of the arrangement of the light sources 10.
- Each of the first light source 10-1 and the second light source 10-2 includes a red light source 10R that emits red light, a green light source 10G that emits blue light, and a blue light source 10B that emits green light. You may go out. White light may be generated by mixing these color lights.
- the optical axis position of the first light source 10-1 and the optical axis position of the second light source 10-2 are the same as seen from the light emitting direction. That is, the optical axis position in the X direction of each light source is the same in the lower light guide plate 11A and the upper light guide plate 11B.
- FIG. 6 shows a second example of the arrangement of the light sources 10.
- the first light source 10-1 and the second light source plate 11B are different from each other in the X-direction optical axis position between the first light source 10-1 and the second light source 10-2.
- the relative position with respect to the light source 10-2 may be offset.
- the optical axis positions of the first light source 10-1 and the second light source 10-2 are different for each light source unit 10U when viewed from the light emitting direction.
- the light emitted from the first light source 10-1 and incident on the light incident surface of the lower light guide plate 11A travels inside the lower light guide plate 11A and is emitted from the first light output surface.
- the light emitted from the second light source 10-2 and incident on the second light incident surface of the upper light guide plate 11B travels inside the upper light guide plate 11B and is emitted from the second light output surface.
- the light emitted from each of the lower light guide plate 11A and the upper light guide plate 11B is combined, passes through the optical sheet 13, and is observed as light emission.
- each of the two light guide plates arranged opposite to each other is provided with a dot pattern optimized to reduce luminance unevenness or color unevenness. Unevenness can be reduced. Further, by optimizing the arrangement of the light sources arranged to face the light incident surfaces of the light guide plates, the luminance unevenness or the color unevenness can be further reduced.
- the first light source 10-1 and the second light source 10-2 are each composed of three red light sources 10R and one green light, as in the configuration examples of FIGS.
- FIG. 7 compares the dot pattern coverages of Comparative Example 1 and Example 1.
- FIG. 7 shows the coverage of the second dot pattern 30-2 on the upper light guide plate 11B, but the coverage of the first dot pattern 30-1 on the lower light guide plate 11A is substantially the same. May be.
- the vertical axis represents the coverage of the second dot pattern 30-2, and the horizontal axis represents the distance in the Y direction. The distance in the Y direction is 0 in the center in the Y direction and the minus direction on the light incident surface side (side on which the light source is arranged). The same applies to other characteristic diagrams thereafter.
- the second light incident surface side (the side on which the second light source 10-2 is disposed) is the minus direction.
- the side on which the first light incident surface side (first light source 10-1) is disposed is the minus direction.
- dot patterns 30-1 and 30-2 are provided only in the plus direction from the center in the Y direction.
- the first dot pattern 30-1 is provided so as to cover a half region of the first light emission promoting surface of the lower light guide plate 11A
- the second dot pattern 30-2 is provided on the upper light guide plate 11B. Is provided so as to cover a half region of the second light emission promoting surface. That is, as Comparative Example 1, a configuration in the case where the overlapping area (see FIG. 3) of the dot patterns 30-1 and 30-2 is not provided is shown.
- dot patterns 30-1 and 30-2 are also provided on the minus side in the Y direction, and overlapping areas of dot patterns 30-1 and 30-2 (FIG. 3). Reference) is provided.
- FIG. 8 shows the dimensions of each part of the upper light guide plate 11B in Comparative Example 1 and Example 1.
- FIG. 9 shows the dimensions of each part of the lower light guide plate 11A in the first comparative example and the first example.
- FIG. 9 also shows the dimensions of the arrangement of the first light source 10-1, but the dimensions of the arrangement of the second light source 10-2 are basically the same.
- the optical axis positions in the X direction of the first light source 10-1 and the second light source 10-2 are the same.
- the comparative example 2 mentioned later also has the same dimension as FIG. 8 and FIG.
- FIG. 10 is a comparison of luminance distribution in the Y direction between Comparative Example 1 and Example 1.
- FIG. 11 shows the in-plane luminance distribution of Comparative Example 1.
- FIG. 12 shows the in-plane luminance distribution of Example 1.
- the vertical axis represents luminance
- the horizontal axis represents distance in the Y direction.
- FIG. 10 shows characteristics when both the lower light guide plate 11A and the upper light guide plate 11B are turned on, and characteristics when only the upper light guide plate 11B is turned on.
- Y 0
- FIG. 13 is a comparison of the dot pattern coverages of Comparative Example 2 and Example 1.
- FIG. 13 shows the coverage of the second dot pattern 30-2 on the upper light guide plate 11B, but the coverage of the first dot pattern 30-1 on the lower light guide plate 11A is substantially the same. May be.
- the vertical axis represents the coverage of the second dot pattern 30-2, and the horizontal axis represents the distance in the Y direction.
- FIG. 14 shows the configuration of the second dot pattern 30-2 of the upper light guide plate 11B of Comparative Example 2, but the configuration of the first dot pattern 30-1 in the lower light guide plate 11A is substantially the same. It may be.
- FIG. 15 shows the configuration of the second dot pattern 30-2 of the upper light guide plate 11B of Example 1, but the configuration of the first dot pattern 30-1 in the lower light guide plate 11A is substantially the same. It may be.
- the boundary 40 of the effective area that can be used as illumination light is shown for reference.
- the second dot pattern 30-2 of the upper light guide plate 11B (and the first dot pattern 30-1 in the lower light guide plate 11A) is a dot corresponding to the position in the Y direction.
- the pattern density is changed by changing the dot pitch (and dot size) of 31.
- Comparative Example 1 As shown in FIG. 14, the pattern density is changed by changing only the dot size without changing the dot pitch.
- FIG. 16 is a comparison of luminance distribution in the Y direction between Comparative Example 2 and Example 1.
- FIG. 17 shows the in-plane luminance distribution of Comparative Example 2.
- the vertical axis represents luminance
- the horizontal axis represents distance in the Y direction.
- FIG. 16 shows characteristics when both the lower light guide plate 11A and the upper light guide plate 11B are turned on, and characteristics when only the upper light guide plate 11B is turned on.
- Example 2 In production, there is a limit to minimizing the dot size, and when trying to form a dot pattern at an equal dot pitch as in Comparative Example 2, the minimum coverage is gradually reduced to zero as shown in FIG. It becomes difficult. For this reason, in Comparative Example 2, a singular point of coverage change occurs at the start point of the dot pattern, and is recognized as luminance unevenness as shown at positions Ya, Yb, and Yc in FIGS. On the other hand, in Example 1, it is possible to obtain a surface light source that does not cause singularity unevenness by making the dot pitch variable.
- FIG. 18 shows a luminance distribution in the X direction of the second embodiment.
- the vertical axis represents luminance
- the horizontal axis represents distance in the X direction.
- the distance in the X direction is 0 in the center in the X direction, and the negative direction on the left side when viewed from the light emitting side.
- FIG. 19 shows an in-plane luminance distribution of Example 2.
- FIG. 20 shows the dimensions of the arrangement of the second light source 10-2 in the upper light guide plate 11B of the second embodiment.
- FIG. 21 shows the dimensions of the arrangement of the first light source 10-1 in the lower light guide plate 11A of the second embodiment.
- FIG. 22 shows the luminance distribution in the X direction of the third embodiment.
- the vertical axis represents luminance
- the horizontal axis represents distance in the X direction.
- FIG. 23 shows the in-plane luminance distribution of Example 3.
- FIG. 24 shows the dimensions of the arrangement of the second light source 10-2 in the upper light guide plate 11B of the third embodiment.
- FIG. 25 shows the dimensions of the arrangement of the first light source 10-1 in the lower light guide plate 11A of the third embodiment. Note that Examples 4 and 5 described later have the same dimensions as those in FIGS.
- the optical axis positions in the X direction of the first light source 10-1 and the second light source 10-2 are the same as in the configuration example of FIG. No offset).
- the optical axis positions in the X direction of the first light source 10-1 and the second light source 10-2 are different from each other as in the configuration example of FIG. Let (offset).
- the arrangement pitch between the first light source 10-1 and the second light source 10-2 is large, if the first light source 10-1 and the second light source 10-2 are arranged coaxially, the axis thereof As shown in FIGS. 18 and 19, the luminance unevenness occurs in the X direction.
- FIG. 26 compares the coverage of the dot patterns of Examples 3, 4, and 5.
- FIG. 26 shows the coverage of the second dot pattern 30-2 on the upper light guide plate 11B, but the coverage of the first dot pattern 30-1 on the lower light guide plate 11A is substantially the same. May be.
- the vertical axis represents the coverage of the second dot pattern 30-2, and the horizontal axis represents the distance in the Y direction.
- FIG. 27 is a comparison of luminance distributions in the Y direction of Examples 3, 4, and 5.
- the vertical axis represents luminance
- the horizontal axis represents distance in the Y direction.
- FIG. 27 shows characteristics when both the lower light guide plate 11A and the upper light guide plate 11B are turned on, and characteristics when only the upper light guide plate 11B is turned on.
- FIG. 28 and FIG. 29 compare the normalized luminance distributions in the Y direction of Examples 3, 4 and 5.
- FIG. 28 and FIG. 29 show characteristics when both the lower light guide plate 11A and the upper light guide plate 11B are turned on, and characteristics when only the upper light guide plate 11B is turned on.
- FIG. 30 shows the in-plane luminance distribution of Example 4.
- FIG. 31 shows the luminance distribution in the X direction of the fourth embodiment. In FIG. 31, the vertical axis represents luminance, and the horizontal axis represents distance in the X direction.
- FIG. 32 shows the in-plane luminance distribution of Example 5.
- FIG. 33 shows the luminance distribution in the X direction of the fifth embodiment. In FIG. 33, the vertical axis represents luminance and the horizontal axis represents distance in the X direction.
- FIG. 34 shows the in-plane luminance distribution of the upper light guide plate of Example 3.
- FIG. 35 shows the luminance distribution in the X direction of the upper light guide plate of Example 3.
- the vertical axis represents luminance and the horizontal axis represents distance in the X direction.
- FIG. 36 schematically shows the luminance distribution of the third embodiment.
- FIG. 36 schematically shows a luminance distribution in the case where the emission luminances of the lower light guide plate 11A and the upper light guide plate 11B are combined in the third embodiment.
- FIG. 37 shows the in-plane luminance distribution of the upper light guide plate of Example 4.
- FIG. 38 shows the luminance distribution in the X direction of the upper light guide plate of Example 4.
- the vertical axis represents luminance
- the horizontal axis represents distance in the X direction.
- FIG. 39 schematically shows the luminance distribution of the fourth embodiment.
- FIG. 39 schematically shows a luminance distribution in the case where the emission luminances of the lower light guide plate 11A and the upper light guide plate 11B are combined in the fourth embodiment.
- FIG. 40 shows the in-plane luminance distribution of the upper light guide plate of Example 5.
- FIG. 41 shows the luminance distribution in the X direction of the upper light guide plate of Example 5.
- the vertical axis represents luminance
- the horizontal axis represents distance in the X direction.
- FIG. 42 schematically shows the luminance distribution of the fifth embodiment.
- FIG. 42 schematically shows a luminance distribution in the case where the emission luminances of the lower light guide plate 11A and the upper light guide plate 11B are combined in the fourth embodiment.
- the dot pattern coverage is different depending on the distance in the Y direction.
- the luminance distribution in the Y direction in which only one of the upper light guide plate 11B and the lower light guide plate 11A is lit is different in each embodiment as shown in FIG. Even in such a case, the luminance distribution in the Y direction in which both the upper light guide plate 11B and the lower light guide plate 11A are lit can be made substantially the same in each embodiment as shown in FIG.
- the luminance distribution in the X direction is different in each embodiment, and the luminance distribution when viewed as a whole surface is different. Further, when considered as a superposition of the respective outgoing luminance distributions of the lower light guide plate 11A and the upper light guide plate 11B, there is an optimum distribution regarding the luminance change in the Y direction. As shown in FIG. 27, there is a region where the luminance distribution is not meshed between the upper and lower light guide plates as shown in FIG. In addition, in the case of the Y-direction luminance change that is too gentle as in the fifth embodiment shown in FIG. 27, the luminance on the light source side tends to increase as shown in FIG. For this reason, it is preferable that the luminance change is between those in the Y direction.
- the luminance at an arbitrary position in the observation plane orthogonal to the light emission direction satisfies the following condition.
- y ⁇ 0 0.025 + 1.05 ⁇ sin 2 ⁇ (y + 1) ⁇ ⁇ / 4) ⁇ >L> (0.45 + 1.6 ⁇ y) (1)
- y position of each light guide plate in the light guide direction viewed from the light exit direction (in the light guide direction of each light guide plate, the position of each light incident surface is ⁇ 1, the center is 0, Position is 1)
- the following conditions (1) ′ and (2) ′ may be satisfied.
- Second Embodiment> (Light-Emitting Device Using Only B Light Source)
- a light emitting device (backlight unit 1A) according to a second embodiment of the present disclosure will be described.
- substantially the same components as those in the backlight unit 1 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted as appropriate.
- FIG. 43 illustrates an example of a cross-sectional configuration of the backlight unit 1A according to the present embodiment.
- FIG. 44 shows an arrangement configuration in the XY plane of the lower light guide plate 11A and the upper light guide plate 11B, the first light source 10-1, and the second light source 10-2 in the present embodiment.
- the backlight unit 1 ⁇ / b> A according to the present embodiment further includes a wavelength conversion sheet 14.
- the configuration example in which the red light source 10R, the green light source 10G, and the blue light source 10B are combined as the first light source 10-1 and the second light source 10-2 has been described. By combining with the sheet 14, it is possible to use only the blue light source 10B.
- the wavelength conversion sheet 14 is provided between the second light exit surface of the upper light guide plate 11 ⁇ / b> B and the optical sheet 13.
- the wavelength conversion sheet 14 includes, for example, a fluorescent material that converts part of blue light as predetermined color light into another wavelength such as red light, green light, or yellow light.
- white light emission is obtained by mixing the blue light as the predetermined color light from the blue light source 10 ⁇ / b> B and the light after wavelength conversion by the wavelength conversion sheet 14.
- FIG. 45 shows a specific example of the arrangement of the blue light source 10B with respect to the upper light guide plate 11B in the present embodiment.
- FIG. 46 shows a specific example of the arrangement of the blue light source 10B with respect to the lower light guide plate 11A.
- the X-direction optical axis positions of the blue light source 10B constituting the first light source 10-1 and the blue light source 10B constituting the second light source 10-2 are different.
- the relative position of each blue light source 10B may be offset.
- FIG. 47 shows a configuration example of the light guide plate and the light source in the light emitting device according to the present embodiment.
- the lower light guide plate 11A and the upper light guide plate 11B have the first light source 10-1 and the second light source 10-2 opposed to the side surfaces in the Y direction.
- it may be arranged to face the side surface in the X direction.
- the first light source 10-1 may be disposed to face the third side surface S3 of the lower light guide plate 11A as the first light incident surface.
- the second light source 10-2 may be disposed to face the fourth side surface S4 of the upper light guide plate 11B as the second light incident surface.
- the pattern density of the first dot pattern 30-1 and the second dot pattern 30-2 may be changed in the X direction.
- the backlight units 1 and 1A as described above are incorporated in the display device 2 shown in FIG. 48, for example, and can be applied to the following electronic devices.
- the display device 2 is, for example, a liquid crystal display.
- polarizing plates 21a and 21b are stacked on the light incident side and the light emitting side of the liquid crystal panel 20, and the backlight units 1 and 1A illuminate the liquid crystal panel 20 from the back side.
- Examples of the electronic apparatus include a television device, an electronic book, a smartphone, a digital camera, a notebook personal computer, a video camera, and a mobile phone as described below.
- the display device 2 using the backlight units 1 and 1A can be applied to electronic devices in various fields that display an externally input video signal or an internally generated video signal as an image or video. Is possible.
- FIG. 49 is used as a television apparatus, and has a configuration in which a flat main body 102 for image display is supported by a stand 103.
- the illustrated television apparatus is used as a stationary type with the stand 103 attached to the main body 102 and placed on a horizontal surface such as a floor, a shelf, or a stand, but the stand 103 is removed from the main body 102. It can also be used as a wall-hanging type.
- the main body 102 is configured to include the display device 2 described above.
- FIG. 50 shows the appearance of an electronic book.
- FIG. 51 shows the appearance of another electronic book.
- Each of these electronic books has, for example, a display unit 210 and a non-display unit 220, and the display unit 210 is configured by the display device 2 described above.
- FIG. 52 shows the appearance of a smartphone.
- the smartphone includes a display unit 230 and a non-display unit 240, and the display unit 230 is configured by the display device 2 described above.
- FIG. 53 and 54 show the appearance of the digital camera.
- FIG. 53 shows the appearance of the digital camera viewed from the front (subject side)
- FIG. 54 shows the appearance of the digital camera viewed from the rear (image side).
- the digital camera includes, for example, a flash light emitting unit 410, a display unit 420, a menu switch 430, and a shutter button 440
- the display unit 420 includes the display device 2 described above.
- FIG. 55 shows the appearance of a notebook personal computer.
- the notebook personal computer has, for example, a main body 510, a keyboard 520 for inputting characters and the like, and a display unit 530 for displaying an image.
- the display unit 530 is configured by the display device 2 described above. .
- FIG. 56 shows the appearance of the video camera.
- This video camera includes, for example, a main body 610, a subject photographing lens 620 provided on the front side surface of the main body 610, a start / stop switch 630 at the time of photographing, and a display 640.
- the display unit 640 is configured by the display device 2 described above.
- the mobile phone is obtained by connecting an upper housing 710 and a lower housing 720 with a connecting portion (hinge portion) 730, and includes a display 740, a sub-display 750, a picture light 760, and a camera 770. Yes.
- the display 740 or the sub-display 750 is configured by the display device 2 described above.
- the numerical values exemplified in the above embodiments are not limited, and may be other numerical values.
- a first light guide having a first light incident surface, a first light emitting surface that emits light in a predetermined light emitting direction, and a first light emission promoting surface provided with a first pattern.
- the first pattern is a pattern composed of a plurality of first point-like portions whose arrangement pitch changes so that the density increases as the distance from the first light incident surface increases.
- the second pattern is a pattern composed of a plurality of second point-like portions whose arrangement pitch changes as the distance from the second light incident surface increases, and the density increases. As viewed from the light emitting direction, the areas where the first pattern and the second pattern are provided partially overlap, and the first pattern and the second pattern have a high density.
- a light emitting device comprising: the directions are opposite to each other.
- Each light guide plate further includes a side surface facing each light incident surface, The light emitting device according to any one of (1) to (5), wherein a luminance at an arbitrary position in an observation plane orthogonal to the light emission direction satisfies the following condition.
- Each of the plurality of first light sources and the plurality of second light sources includes a laser diode that emits red light, a laser diode that emits green light, and a laser diode that emits blue light. Thru
- Each of the plurality of first light sources and the plurality of second light sources is a laser diode that emits light of a predetermined color.
- the light-emitting device according to any one of (1) to (7), further including a wavelength conversion sheet that is disposed opposite to the second light guide plate and converts the predetermined color light into another color light.
- the light emitting device A first light guide having a first light incident surface, a first light emitting surface that emits light in a predetermined light emitting direction, and a first light emission promoting surface provided with a first pattern.
- a light plate A second light incident surface; a second light emitting surface that emits light in the light emitting direction; and a second light emission promoting surface provided with a second pattern.
- a second light guide plate disposed opposite to the light guide plate,
- the first pattern is a pattern composed of a plurality of first point-like portions whose arrangement pitch changes such that the density increases as the distance from the first light incident surface increases.
- the second pattern is a pattern composed of a plurality of second point-like portions in which the arrangement pitch changes and the density increases as the distance from the second light incident surface increases. As viewed from the light emitting direction, the areas where the first pattern and the second pattern are provided partially overlap, and the first pattern and the second pattern have a high density. Display devices in which the directions are opposite to each other.
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Abstract
Description
第1のパターンは、第1の光入射面から離れるにしたがって密度が大きくなるように配置ピッチが変化する複数の第1の点状部からなるパターンであり、第2のパターンは、第2の光入射面から離れるにしたがって配置ピッチが変化して密度が大きくなる複数の第2の点状部からなるパターンである。光出射方向から見て、第1のパターンと第2のパターンとが設けられた領域が部分的に重複し、かつ、第1のパターンと第2のパターンとで密度が大きくなる方向が互いに逆向きとなっている。
なお、ここに記載された効果は必ずしも限定されるものではなく、本開示中に記載されたいずれかの効果であってもよい。
<1.第1の実施の形態>(図1~図42)
[1.1 発光装置の基本構成例]
[1.2 ドットパターンおよび光源の構成例]
[1.3 作用および効果(実施例)]
<2.第2の実施の形態>(青色光源のみを用いた発光装置)(図43~図46)
<3.第3の実施の形態>(X方向の側面に光源を配置した例)(図47)
<4.第4の実施の形態>(表示装置への適用例)(図48~図58)
<5.その他の実施の形態>
[1.1 発光装置の基本構成例]
図1は、本開示の第1の実施の形態に係る発光装置(バックライトユニット1)の全体構成を表したものである。図2は、バックライトユニット1の断面構成を表すものである。バックライトユニット1は、例えば、透過型の液晶パネルを背後から照明するものであり、第1の光源10-1、第2の光源10-2、下段導光板11A、上段導光板11B、反射シート12および光学シート13を有している。
なお、本実施の形態において、「下段導光板11A」が本開示における「第1の導光板」の一具体例に相当する。また、「上段導光板11B」が本開示における「第2の導光板」の一具体例に相当する。
さらに、図3~図6を参照してドットパターンおよび光源の構成例をより具体的に説明する。
このバックライトユニット1では、第1の光源10-1から出射され、下段導光板11Aの光入射面に入射した光は、下段導光板11Aの内部を進行して、第1の光出射面から出射する。一方、第2の光源10-2から出射され、上段導光板11Bの第2の光入射面に入射した光は、上段導光板11Bの内部を進行して、第2の光出射面から出射する。これらの下段導光板11Aと上段導光板11Bとのそれぞれから出射された光が合成され、光学シート13を通過して発光として観測される。
なお、本明細書に記載された効果はあくまでも例示であって限定されるものではなく、また他の効果があってもよい。以降の他の実施の形態についても同様である。
y<0のとき、
0.025+1.05・sin2{(y+1)・π/4)}>L>(0.45+1.6・y) ……(1)
y≧0のとき、
-0.075+1.05・sin2{(y+1)・π/4)}<L<(0.55+1.6・y) ……(2)
Lmax=1、Lmin=0
ただし、
y:光出射方向から見た各導光板における導光方向の位置(各導光板の導光方向において、各光入射面の位置を-1、中央を0、各光入射面に対向する側面の位置を1とする)
L:輝度比率(第1および第2の光源10-1,10-2の双方を点灯したときの観察面内の任意の位置での輝度を1としたときに、第1および第2の光源10-1,10-2のうち一方のみを点灯した場合における任意の位置での輝度比率)
Lmax:Lの最大値
Lmin:Lの最小値
とする。
y<0のとき、
0.025+0.95・sin2{(y+1)・π/4)}≧L≧(0.5+1.8・y) ……(1)’
y≧0のとき、
0.025+0.95・sin2{(y+1)・π/4)}≦L≦(0.5+1.8・y) ……(2)’
Lmax=1、Lmin=0
次に、本開示の第2の実施の形態に係る発光装置(バックライトユニット1A)について説明する。なお、以下では上記第1の実施の形態に係るバックライトユニット1における構成要素と略同じ部分については、同一符号を付し、適宜説明を省略する。
次に、本開示の第3の実施の形態に係る発光装置(バックライトユニット)について説明する。なお、以下では上記第1および第2の実施の形態に係るバックライトユニット1,1Aにおける構成要素と略同じ部分については、同一符号を付し、適宜説明を省略する。
上記のようなバックライトユニット1,1Aは、例えば図48に示した表示装置2に組み込まれ、以下の電子機器に適用することができる。表示装置2は、例えば液晶ディスプレイである。この表示装置1では、例えば液晶パネル20の光入射側および光出射側に偏光板21a,21bが積層されると共に、バックライトユニット1,1Aがその液晶パネル20を背面側から照明するように構成されている。電子機器としては、例えば以下に挙げるようなテレビジョン装置,電子ブック、スマートフォン、デジタルカメラ,ノート型パーソナルコンピュータ、ビデオカメラおよび携帯電話機等が挙げられる。言い換えると、上記バックライトユニット1,1Aを用いた表示装置2は、外部から入力された映像信号あるいは内部で生成した映像信号を、画像あるいは映像として表示するあらゆる分野の電子機器に適用することが可能である。
図49は、テレビジョン装置として用いられるものであり、画像表示のための平板状の本体部102をスタンド103により支持した構成を有している。なお、図示したテレビジョン装置は、スタンド103を本体部102に取り付けた状態で、床,棚または台などの水平面に載置して据置型として用いられるが、スタンド103を本体部102から取り外した状態で壁掛型として用いることも可能である。本体部102が、上記の表示装置2を含んで構成されている。
図50は、電子ブックの外観を表したものである。図51は、他の電子ブックの外観を表したものである。これらの電子ブックは、いずれも、例えば表示部210および非表示部220を有しており、表示部210が上記の表示装置2により構成されている。
図52は、スマートフォンの外観を表したものである。このスマートフォンは、例えば、表示部230および非表示部240を有しており、表示部230が上記の表示装置2により構成されている。
図53および図54は、デジタルカメラの外観を表したものである。図53は、そのデジタルカメラをその前方(被写体側)から眺めた外観を表し、図54は、そのデジタルカメラをその後方(像側)から眺めた外観を表す。このデジタルカメラは、例えば、フラッシュ用の発光部410、表示部420、メニュースイッチ430およびシャッターボタン440を有しており、表示部420が上記の表示装置2により構成されている。
図55は、ノート型パーソナルコンピュータの外観を表したものである。このノート型パーソナルコンピュータは、例えば、本体510,文字等の入力操作のためのキーボード520および画像を表示する表示部530を有しており、表示部530が上記の表示装置2により構成されている。
図56は、ビデオカメラの外観を表したものである。このビデオカメラは、例えば、本体部610,この本体部610の前方側面に設けられた被写体撮影用のレンズ620,撮影時のスタート/ストップスイッチ630および表示部640を有している。表示部640が上記の表示装置2により構成されている。
図57および図58は、携帯電話機の外観を表したものである。この携帯電話機は、例えば、上側筐体710と下側筐体720とを連結部(ヒンジ部)730で連結したものであり、ディスプレイ740,サブディスプレイ750,ピクチャーライト760およびカメラ770を有している。これらのうちのディスプレイ740またはサブディスプレイ750が、上記の表示装置2により構成されている。
本開示による技術は、上記各実施の形態および実施例の説明に限定されず種々の変形実施が可能である。
(1)
第1の光入射面と、所定の光出射方向に向けて光を出射する第1の光出射面と、第1のパターンが設けられた第1の光出射促進面とを有する第1の導光板と、
第2の光入射面と、光出射方向に向けて光を出射する第2の光出射面と、第2のパターンが設けられた第2の光出射促進面とを有し、第1の導光板に対向配置された第2の導光板と
を備え、
第1のパターンは、第1の光入射面から離れるにしたがって密度が大きくなるように配置ピッチが変化する複数の第1の点状部からなるパターンであり、
第2のパターンは、第2の光入射面から離れるにしたがって配置ピッチが変化して密度が大きくなる複数の第2の点状部からなるパターンであり、
前記光出射方向から見て、前記第1のパターンと前記第2のパターンとが設けられた領域が部分的に重複し、かつ、前記第1のパターンと前記第2のパターンとで密度が大きくなる方向が互いに逆向きとなっている
を備える発光装置。
(2)
前記第1の光入射面に対向配置された複数の第1の光源と、
前記第2の光入射面に対向配置された複数の第2の光源と
をさらに備える上記(1)に記載の発光装置。
(3)
前記光出射方向から見て、前記第1の光源の光軸位置と前記第2の光源の光軸位置とが、互いに異なる
上記(2)に記載の発光装置。
(4)
前記第1および第2の光源はそれぞれ、所定数ごとに1つの光源ユニットを構成し、
前記光出射方向から見て、前記光源ユニットごとに、前記第1の光源の光軸位置と前記第2の光源の光軸位置とが、互いに異なる
上記(2)に記載の発光装置。
(5)
複数の前記第1の点状部は、前記第1の光入射面から離れるにしたがって密度が大きくなるように配置ピッチおよび大きさが変化し、
複数の前記第2の点状部は、前記第2の光入射面から離れるにしたがって密度が大きくなるように配置ピッチおよび大きさが変化する
上記(1)ないし(4)のいずれか1つに記載の発光装置。
(6)
前記各導光板は、前記各光入射面に対向する側面をさらに有し、
前記光出射方向に直交する観察面内の任意の位置での輝度が、以下の条件を満たす
上記(1)ないし(5)のいずれか1つに記載の発光装置。
y<0のとき、
0.025+1.05・sin2{(y+1)・π/4)}>L>(0.45+1.6・y) ……(1)
y≧0のとき、
-0.075+1.05・sin2{(y+1)・π/4)}<L<(0.55+1.6・y) ……(2)
Lmax=1、Lmin=0
ただし、
y:前記光出射方向から見た前記各導光板における導光方向の位置(前記各導光板の導光方向において、前記各光入射面の位置を-1、中央を0、前記各光入射面に対向する側面の位置を1とする)
L:輝度比率(前記第1および第2の光源の双方を点灯したときの前記観察面内の任意の位置での輝度を1としたときに、前記第1および第2の光源のうち一方のみを点灯した場合における前記任意の位置での輝度比率)
Lmax:Lの最大値
Lmin:Lの最小値
とする。
(7)
前記光出射方向から見て、前記第1の光源と前記第2の光源とが互いに逆方向に向けて光を出射する
上記(2)ないし(6)のいずれか1つに記載の発光装置。
(8)
前記複数の第1の光源および前記複数の第2の光源はそれぞれ、赤色光を出射するレーザダイオードと、緑色光を出射するレーザダイオードと、青色光を出射するレーザダイオードとを含む
上記(2)ないし(7)のいずれか1つに記載の発光装置。
(9)
前記複数の第1の光源および前記複数の第2の光源はそれぞれ、所定の色光を出射するレーザダイオードであり、
前記第2の導光板に対向配置され、前記所定の色光を他の色光に変換する波長変換シートをさらに備えた
上記(1)ないし(7)のいずれか1つに記載の発光装置。
(10)
表示パネルと、前記表示パネルを照明する発光装置とを含み、
前記発光装置は、
第1の光入射面と、所定の光出射方向に向けて光を出射する第1の光出射面と、第1のパターンが設けられた第1の光出射促進面とを有する第1の導光板と、
第2の光入射面と、前記光出射方向に向けて光を出射する第2の光出射面と、第2のパターンが設けられた第2の光出射促進面とを有し、前記第1の導光板に対向配置された第2の導光板と
を備え、
前記第1のパターンは、前記第1の光入射面から離れるにしたがって密度が大きくなるように配置ピッチが変化する複数の第1の点状部からなるパターンであり、
前記第2のパターンは、前記第2の光入射面から離れるにしたがって配置ピッチが変化して密度が大きくなる複数の第2の点状部からなるパターンであり、
前記光出射方向から見て、前記第1のパターンと前記第2のパターンとが設けられた領域が部分的に重複し、かつ、前記第1のパターンと前記第2のパターンとで密度が大きくなる方向が互いに逆向きとなっている
表示装置。
Claims (10)
- 第1の光入射面と、所定の光出射方向に向けて光を出射する第1の光出射面と、第1のパターンが設けられた第1の光出射促進面とを有する第1の導光板と、
第2の光入射面と、前記光出射方向に向けて光を出射する第2の光出射面と、第2のパターンが設けられた第2の光出射促進面とを有し、前記第1の導光板に対向配置された第2の導光板と
を備え、
前記第1のパターンは、前記第1の光入射面から離れるにしたがって密度が大きくなるように配置ピッチが変化する複数の第1の点状部からなるパターンであり、
前記第2のパターンは、前記第2の光入射面から離れるにしたがって配置ピッチが変化して密度が大きくなる複数の第2の点状部からなるパターンであり、
前記光出射方向から見て、前記第1のパターンと前記第2のパターンとが設けられた領域が部分的に重複し、かつ、前記第1のパターンと前記第2のパターンとで密度が大きくなる方向が互いに逆向きとなっている
発光装置。 - 前記第1の光入射面に対向配置された複数の第1の光源と、
前記第2の光入射面に対向配置された複数の第2の光源と
をさらに備える請求項1に記載の発光装置。 - 前記光出射方向から見て、前記第1の光源の光軸位置と前記第2の光源の光軸位置とが、互いに異なる
請求項2に記載の発光装置。 - 前記第1および第2の光源はそれぞれ、所定数ごとに1つの光源ユニットを構成し、
前記光出射方向から見て、前記光源ユニットごとに、前記第1の光源の光軸位置と前記第2の光源の光軸位置とが、互いに異なる
請求項2に記載の発光装置。 - 複数の前記第1の点状部は、前記第1の光入射面から離れるにしたがって密度が大きくなるように配置ピッチおよび大きさが変化し、
複数の前記第2の点状部は、前記第2の光入射面から離れるにしたがって密度が大きくなるように配置ピッチおよび大きさが変化する
請求項1に記載の発光装置。 - 前記各導光板は、前記各光入射面に対向する側面をさらに有し、
前記光出射方向に直交する観察面内の任意の位置での輝度が、以下の条件を満たす
請求項1に記載の発光装置。
y<0のとき、
0.025+1.05・sin2{(y+1)・π/4)}>L>(0.45+1.6・y) ……(1)
y≧0のとき、
-0.075+1.05・sin2{(y+1)・π/4)}<L<(0.55+1.6・y) ……(2)
Lmax=1、Lmin=0
ただし、
y:前記光出射方向から見た前記各導光板における導光方向の位置(前記各導光板の導光方向において、前記各光入射面の位置を-1、中央を0、前記各光入射面に対向する側面の位置を1とする)
L:輝度比率(前記第1および第2の光源の双方を点灯したときの前記観察面内の任意の位置での輝度を1としたときに、前記第1および第2の光源のうち一方のみを点灯した場合における前記任意の位置での輝度比率)
Lmax:Lの最大値
Lmin:Lの最小値
とする。 - 前記光出射方向から見て、前記第1の光源と前記第2の光源とが互いに逆方向に向けて光を出射する
請求項2に記載の発光装置。 - 前記複数の第1の光源および前記複数の第2の光源はそれぞれ、赤色光を出射するレーザダイオードと、緑色光を出射するレーザダイオードと、青色光を出射するレーザダイオードとを含む
請求項2に記載の発光装置。 - 前記複数の第1の光源および前記複数の第2の光源はそれぞれ、所定の色光を出射するレーザダイオードであり、
前記第2の導光板に対向配置され、前記所定の色光を他の色光に変換する波長変換シートをさらに備えた
請求項2に記載の発光装置。 - 表示パネルと、前記表示パネルを照明する発光装置とを含み、
前記発光装置は、
第1の光入射面と、所定の光出射方向に向けて光を出射する第1の光出射面と、第1のパターンが設けられた第1の光出射促進面とを有する第1の導光板と、
第2の光入射面と、前記光出射方向に向けて光を出射する第2の光出射面と、第2のパターンが設けられた第2の光出射促進面とを有し、前記第1の導光板に対向配置された第2の導光板と
を備え、
前記第1のパターンは、前記第1の光入射面から離れるにしたがって密度が大きくなるように配置ピッチが変化する複数の第1の点状部からなるパターンであり、
前記第2のパターンは、前記第2の光入射面から離れるにしたがって配置ピッチが変化して密度が大きくなる複数の第2の点状部からなるパターンであり、
前記光出射方向から見て、前記第1のパターンと前記第2のパターンとが設けられた領域が部分的に重複し、かつ、前記第1のパターンと前記第2のパターンとで密度が大きくなる方向が互いに逆向きとなっている
表示装置。
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