WO2007086456A1 - 面光源装置及び表示装置 - Google Patents
面光源装置及び表示装置 Download PDFInfo
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- WO2007086456A1 WO2007086456A1 PCT/JP2007/051155 JP2007051155W WO2007086456A1 WO 2007086456 A1 WO2007086456 A1 WO 2007086456A1 JP 2007051155 W JP2007051155 W JP 2007051155W WO 2007086456 A1 WO2007086456 A1 WO 2007086456A1
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- Prior art keywords
- light
- emission
- guide plate
- light source
- light guide
- Prior art date
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Classifications
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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
- G02B6/0045—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 by shaping at least a portion of the light guide
- G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V19/00—Fastening of light sources or lamp holders
-
- 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
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
-
- 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
- G02B6/0075—Arrangements of multiple light guides
- G02B6/0076—Stacked arrangements of multiple light guides of the same or different cross-sectional area
-
- 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
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0028—Light guide, e.g. taper
-
- 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
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, sheet or layer
Definitions
- the present invention relates to a surface light source device and a display device including the surface light source device.
- the present invention relates to a car navigation device, a video camera, a digital camera, an electronic notebook, a mobile phone, a portable electronic terminal device, an electronic notebook,
- the present invention is applied to a planar illumination unit (for example, a backlighting arrangement unit of an LCD panel) in a personal computer, a liquid crystal television or the like, or a display device including the planar illumination unit.
- the present invention can also be applied to a planar illumination unit such as an advertising panel or a display device including the planar illumination unit.
- devices such as a car navigation device, a video camera, a digital camera, an electronic notebook, a mobile phone, a portable electronic terminal device, an electronic notebook, a personal computer, and a liquid crystal television are equipped with a display.
- a liquid crystal display panel as a display member, and is illuminated by a surface light source device using the liquid crystal display panel force light guide plate.
- the light guide plate is usually supplied with light from a primary light source disposed near the side surface.
- rod-shaped fluorescent lamps have been widely used as primary light sources. The light supplied to the light guide plate with the fluorescent lamp force is gradually emitted from the emission surface (major surface) in the course of internal propagation to illuminate the display member (liquid crystal display panel).
- FIG. 15 shows a surface light emitting device 100 according to this prior art (first prior art).
- the surface light emitting device 100 includes a point light source module 104 having LEDs 104r, 104g, and 104b of R, G, and B colors, a mixing light guide plate 101, a light guide plate 102, and a reflector 103.
- the mixing light guide plate 101 mixes the light of each color from the point light source module 104 to whiten and emits the light from the front end surface 106.
- the traveling direction of this light is changed by 180 degrees by the reflector 103 and guided to the end face 107 of the light guide plate 102.
- the white light guided to the end face 107 enters the light guide plate 102 from the end face 107, and then is emitted in a planar shape from the emission face 108 and supplied to the liquid crystal panel 110.
- the light guide length of the light emitted from each LED 104 is increased, and the light guide direction is changed by 180 degrees through the reflection surface of the reflector 103. Therefore, it is not possible to expect a high-intensity planar white illumination that easily reduces the light utilization efficiency.
- FIG. 16 shows its schematic structure.
- the surface light source device 200 uses two light guide plates in an overlapping manner.
- the surface light source device 200 appears to be similar to the surface light source device according to the present invention.
- the surface light source device 200 uses a fluorescent lamp 201 as a primary light source.
- a halftone dot pattern is printed on the entire back surface 204, 205 of the both light guide plates 202, 203. This is simply to make the emission luminance uniform, and by making R, G, and B sufficiently mixed in color, it can be made white and emitted. ⁇ Effects are completely different.
- Patent Document 1 Japanese Patent Laid-Open No. 10-97200
- Patent Document 2 JP 2005-276734 A
- Patent Document 3 JP-A-8-240721
- One object of the present invention is to obtain planar illumination light having no color unevenness when at least two point light sources having different emission colors are used as a primary light source. It is to improve the surface light source device. Another object of the present invention is to provide a display device that can perform high-quality display using such an improved surface light source device.
- Still another object of the present invention is to provide a surface light source device capable of obtaining white planar illumination light having no color unevenness and a high quality display using the same surface light source device by utilizing the above improvement. It is to provide a display device.
- a first light guide plate having a first side end face, a first outgoing face, and a first rear face located on the opposite side of the first outgoing face, and an emission color are provided.
- a second light guide plate having a second back surface located on the opposite side of the second emission surface, and at least two point light sources having different emission colors, and are arranged along the second side end surface
- the present invention is applied to a surface light source device including a second light source group that supplies second illumination light and a layer having a refractive index lower than that of the first light guide plate.
- the layer is interposed between the first emission surface and the second back surface,
- the first side end face and the second side end face are arranged so as to be located on opposite sides.
- the first light guide plate includes a first emission suppression region for suppressing light emission of the first illumination light with the first emission surface force, and the first illumination light from the first emission surface.
- the first emission that promotes the light emission of An acceleration region; and a first emission gradually increasing region connecting the first emission suppression region and the first emission promotion region.
- the second light guide plate includes a second emission suppression region for suppressing light emission of the second illumination light with the second emission surface force, and the second emission surface from the second emission surface.
- a second emission promotion region that promotes light emission of the illumination light; and a second emission increase region that connects the second emission suppression region and the second emission promotion region.
- the first emission suppressing area is located closer to the first side end face than the first emission gradually increasing area, and the first emission promoting area is the first emission accelerating area.
- the first side end surface force is farther than the gradually increasing region.
- the second emission suppressing area is located closer to the second side end surface than the second emission gradually increasing area, and the second emission promoting area is more than the second emission gradually increasing area. Is at a position far from the second side end face.
- the illumination output light output from the second emission surface is typically white light.
- the first light guide plate is a wedge-shaped light guide plate that gradually decreases in thickness as it moves away from the first side end surface
- the second light guide plate has a thickness that increases as the second side end surface force increases. It can be set as the wedge-shaped light-guide plate which decreases gradually.
- the first light guide plate a material that gradually decreases in thickness in the first emission promoting region as the first side end surface force is separated is used.
- the thickness may be gradually decreased as the second side end surface force is separated, and the one may be adopted.
- the first light guide plate is shielded at a terminal located on the opposite side to the first side end face, and the second light guide plate is provided on a terminal opposite to the second side end face. It may be shielded at.
- the present invention is also applied to a display device including a surface light source device and a display member that is illuminated by output light of the surface light source device force.
- a display device including a surface light source device and a display member that is illuminated by output light of the surface light source device force.
- any one of the surface light source devices described above is employed as the surface light source device.
- the first light emission control region is provided on the light incident side of the first illumination light in the first light guide plate, a large part of the first illumination light is provided. Fully mixed Then, the first exit surface force is emitted, enters the second light guide plate, and the second exit surface force is emitted.
- the second light emission control region is provided in the second light guide plate on the light incident side of the second illumination light, the second light is sufficiently mixed before the second illumination light is mixed. It is emitted from the exit surface. That is, a color mixing region in which light of a plurality of colors is mixed is formed in the first and second emission suppressing regions.
- the second emission surface force The light emission occurs uniformly throughout.
- the color and intensity of the output illumination light (emitted light from the second emission surface) of the surface light source device are uniform throughout.
- a light emission color of a point light source used in the first light source group and the second light source group is selected so that white light is generated by a mixture of emission colors, unevenness in color and brightness is obtained by the surface light source device. Light output with less light can be obtained.
- FIG. 1 is an exploded perspective view showing a display device according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view of the display device along the Y direction in FIG.
- FIG. 3 (a) is a plan view showing the display device shown in FIG. 1, in which the liquid crystal display panel (illuminated member) and the first and second light control members are removed. (B) is a partial plan view of the display device showing a mixed state of light from a plurality of LEDs.
- FIG. 4 is a diagram showing an emission luminance curve corresponding to the cross-sectional shape of the main part of the surface light source device provided in the display device shown in FIG.
- FIG. 5 (a) is a partially enlarged cross-sectional view of the surface light source device shown in FIGS. 1 to 3 (a) and 3 (b).
- FIGS. 5B to 5D are partially enlarged cross-sectional views illustrating four types of arrangements according to the first modification of the surface light source device shown in FIG.
- FIG. 6 is a partial cross-sectional view of a surface light source device according to Modification 2 of the present invention.
- FIG. 7 is a partial cross-sectional view of a surface light source device according to Modification 3 of the present invention.
- FIG. 10 (a) is a cross-sectional view of a surface light source device according to Modification 7 of the present invention.
- (B) is an enlarged view of part A in (a).
- (C) is an enlarged view of part B in (a).
- FIG. 11 is a diagram showing a luminance distribution curve of light emitted from the second light guide plate in correspondence with the schematic cross-sectional shape of the surface light source device according to Modification 7.
- FIG. 12 (a) is a plan view of a surface light source device according to Modification 8 of the present invention, assuming a case without forming a wide angle means on the incident surface (the first light guide plate side is shown) (Not shown).
- (b) is a plan view for explaining a surface light source device according to a reference example compared with Modification 8 (the first light guide plate side is not shown).
- (C) is a plan view of a surface light source device according to Modification 8 (the first light guide plate side is not shown).
- (D) is a partially enlarged view of (c).
- (E) is a diagram (a diagram corresponding to (d)) showing another form of the widening means.
- FIG. 13 (a) is an enlarged view showing the main part of FIG. 12 (d).
- (B) is a sectional view taken along line D1-D1 in (a).
- FIG. 14 (a) is a plan view schematically illustrating the surface light source device according to modification 8 with reference to the second light guide plate side force, in order to explain the results of the measurement performed in modification 8. is there.
- (B) is the same as (a)!
- the u value (coordinate value for the red-green axis in the CIE 1976 UCS chromaticity diagram) obtained from the chromaticity measurement force at multiple locations in the center of the second light guide plate.
- FIG. (C) represents the v 'value (coordinate value for the yellow-blue axis in the CIE 1976 UCS chromaticity diagram) obtained from chromaticity measurements at multiple locations in the center of the second light guide plate in Fig. 14 (a).
- FIG. (D) is the u 'value (coordinate with respect to the red-green axis in the CIE 1976 UCS chromaticity diagram) that also provides chromaticity measurement force at multiple locations on the opposite side of the entrance surface of the second light guide plate in (a).
- FIG. (E) is the chromaticity measurement force obtained at multiple locations on the opposite side of the entrance surface of the second light guide plate in (a) v 'value (coordinates on the yellow-blue axis in the CIE 1976 UCS chromaticity diagram)
- FIG. 15 is a cross-sectional view of a surface light source device according to a first prior art.
- FIG. 16 is a cross-sectional view of a surface light source device according to a second prior art.
- FIG. 1 to 3 (a) and 3 (b) show a display device 1 according to the present embodiment.
- FIG. 1 is an exploded perspective view showing the display device 1
- FIG. 2 is a cross-sectional view along the Y direction in FIG.
- FIG. 3 (a) is a plan view showing the display device 1, and is a plan view obtained by removing the liquid crystal display panel (example of illuminated member) 3, the first and second light control members 4 and 5.
- FIG. FIG. FIG. 3 (b) is a partial plan view of the display device 1 showing a mixed state of light from a plurality of LEDs.
- the display device 1 includes a liquid crystal display panel 3 that is illuminated in a planar shape by the surface light source device 2.
- the second light control member 5 is disposed on the upper side (outside) of the first light control member 4.
- the point light source units 10 and 10 are generally primary light sources having at least two point light source powers having different emission colors.
- LEDs 14a, 14b, and 14c that emit light of primary colors of R (red), G (green), and B (blue) are used.
- one LED 14a, 14b, 14c forms one set.
- Each unit 10 generally includes multiple sets of LEDs 14a, 14b, 14c.
- each incident surface 8 a plurality of sets of LEDs 14a, 14b, 14c are arranged alternately in an alternating manner.
- FIG. 3 (a) only three LEDs 14a, 14b, and 14c near both ends of each incident surface 8 are shown, and the other LEDs are not shown.
- the white light generated by the synthesis (mixing) of the three primary colors of the LEDs 14a, 14b, and 14c has a high uniformity across the light emitting surface of the surface light source device 2. Is output.
- the first light guide plate 6 includes a terminal side surface 15 at the end located on the side opposite to the incident surface (first side end surface) 8.
- the second light guide plate 7 is located on the side opposite to the incident surface (second side end surface) 8. It has a terminal side 15 at the end.
- the second light guide plate 7 has an incident surface (second side end surface) 8 of the second light guide plate 7 on the first light guide plate 6 and an end surface (first end surface) of the first light guide plate 6.
- the end surface (second end surface) 8 of the second light guide plate 7 is arranged so as to correspond to the incident surface (first side end surface) 8 of the first light guide plate 6. .
- the first light guide plate 6 and the second light guide plate 7 are made of a material having excellent light transmission properties such as polymethyl methacrylate (PMMA), polycarbonate (PC), and cycloolefin-based resin material.
- the surface opposite to the upper surface (second emission surface) 17 of the second light guide plate 7 is a rear surface (second rear surface) 11, and is mutually connected to the upper surface (first emission surface) 13 of the first light guide plate 6. Opposite each other.
- the first light guide plate 6 and the second light guide plate 7 have a rectangular planar shape, and the thickness decreases as the distance from each incident surface 8 increases.
- the first light guide plate 6 and the second light guide plate 7 are optical members having a wedge plate shape, and the thickness of the first light guide plate 6 and the second light guide plate 7 is maximized at each incident surface 8. In each end face 15, the thickness of the first light guide plate 6 and the second light guide plate 7 is minimized.
- the thickness dimension (dimension in the Z direction in FIGS. 1 and 2) of the surface light source device 2 can be made uniform and small. Therefore, it is advantageous in reducing the size of the surface light source device 2.
- the first emission surface 13 provides an inclined surface that is inclined with respect to the first back surface 16.
- the second separation surface 11 provides another inclined surface that is inclined with respect to the second exit surface 17.
- a thin air layer exists between the second back surface 11 and the first emission surface 13.
- the refractive index of the air layer is smaller than the refractive index of any other optical material equal to about 1.0, for example, smaller than the refractive index of the first light guide plate 6.
- the first light guide plate 6 and the second light guide plate 7 include means for suppressing “light emission before sufficient color mixing is performed”. That is, in the first light guide plate 6, the back surface 16 is a smooth surface within the range of a predetermined dimension (L 1) on the incident surface 8 force end surface 15. Thereby, light emission from the first emission surface 13 is suppressed. In this sense, this region of the back surface 16 provides an emission suppression region (first emission suppression region) 18 that suppresses light emission from the first emission surface 13. Similarly, in the second light guide plate 7, the back surface 11 is a smooth surface in the range of a predetermined force (L1) from the incident surface 8 to the end surface 15. Thereby, light emission from the second emission surface 17 is suppressed. In this sense, this region of the back surface 11 provides an emission suppression region (second emission suppression region) 18 that suppresses light emission from the second emission surface 17.
- each light emission suppression region 18, 18 is necessary for the R, G, B LEDs 14a to 14c to be sufficiently mixed (in this embodiment, white light is generated).
- the distance from each incident surface 8. Now, assuming that the distance from the incident surface 8 where the colors of the LEDs 14a to 14c begin to mix is L1 ', L1> L1.
- the value of the distance L1 ' can be estimated by the following formula, for example.
- 0 in the above equation means that each LED 14a, 14b, 14c ... emitted light in a direction parallel to the exit surface 13 after the incident light from the force enters from the entrance surface 8 Is the spread angle (the size of the angle range that gives an emission intensity greater than half the maximum intensity).
- P is the LED pitch of the same color.
- L1 ' is smaller than L1' if no such contrivance is made. can do.
- L1 ' is the distance at which light of the same color begins to mix (distance from the incident surface 8)
- the predetermined size L1 of the light emission suppression area 18 necessary to make white light sufficiently is L1> L1 'Is preferred.
- the first and second light guide plates 6 and 7 are adjusted to the optimum dimensions according to the thickness dimensions of the first and second light guide plates 6 and 7 and the emission characteristics of the LEDs 14a to 14c.
- the longitudinal direction (X direction) dimension of the incident surface 8 of the first light guide plate 6 and the second light guide plate 7 is L2.
- the light emission suppression regions 18 and 18 of the first light guide plate 6 and the second light guide plate 7 are regions having an area of (L1) X (L2).
- a region having an area of (Ll ′) X (L2) is a pre-light mixing region.
- an exit facilitating region (first side end surface) 8 away from the entrance surface (first side end surface) ( A first emission promoting region) 21 is formed on the back surface 16 of the first light guide plate 6, an exit facilitating region (first side end surface) 8 away from the entrance surface (first side end surface) ( A first emission promoting region) 21 is formed.
- an emission gradually increasing region (first emission gradually increasing region) 20 is formed between the first emission suppressing region 18 and the first emission promoting region 21.
- an emission promotion region (second emission promotion region) 21 apart from the incident surface (second side end surface) 8 is formed.
- an emission increasing area (second emission increasing area) 20 is formed between the second emission suppressing area 18 and the second emission promoting area 21.
- Each emission promoting region 21 is formed within a predetermined dimension (L1) from each end side surface 15. As a result, as shown in FIG. 2, the first emission suppression region 18 overlaps with the second emission promotion region 21, and the second emission suppression region 18 overlaps with the first emission promotion region 21. Further, the first and second emission gradually increasing regions 20 also have an overlapping positional relationship.
- emission promotion means for urging emission from the emission surface 13 or 17 is formed.
- the emission facilitating means include a textured surface, a bowl-shaped minute prism-shaped projection, a blast surface, a rough surface such as a minute projection such as a triangular pyramid or a cone, or a minute concave portion, and an ink printing surface having light irregular reflectivity.
- any material that promotes the emission of light from the emission surface 13 or 17 may be used.
- Each emission gradually increasing region 20 is an "intermediate region” that connects each emission suppressing region 18 and each emission suppressing region 21, and gradually increases the emission promoting capability as the distance from each incident surface 8 increases. It is an area. It is preferable that the ability of emission suppression or emission promotion does not change suddenly at the boundary between each emission gradually increasing region 20 and each emission suppressing region 18 and at the boundary between each emission gradually increasing region 20 and each emission promoting region 21.
- each emission gradually increasing region 20 gradually loses its emission suppressing capability as it moves away from each incident surface 8.
- each of the emission gradually increasing regions 20 is formed so that the formation density of the above-described emission promoting means gradually increases from a sparse to a dense and smooth.
- the formation density of the emission promoting means does not change discontinuously (that is, stepwise) at the boundary between each emission promotion region 21 and each emission gradually increasing region 20.
- the formation density of the emission promotion means in each emission gradually increasing region 20 is changed from the boundary between each emission gradually increasing region 20 and each emission promoting region 21 to the boundary between each emission gradually increasing region 20 and each emission suppressing region 18. The output gradually decreases and becomes 0 at the boundary between each emission gradually increasing region 20 and each emission suppressing region 18.
- the emission promotion means formed in each emission promotion region 21 and the emission promotion means formed in each emission gradual increase region 20 are as long as there is no sense of incongruity regarding the visibility on the surface light source device 2 and the emission luminance.
- Different types for example, a textured surface and a ridge-like microprism-like projection surface may be used.
- the first and second light control members 4 and 5 are formed in a film shape with a resin material (for example, polyethylene terephthalate (PET), PMMA, PC) excellent in light transmittance. As shown in FIGS. 1 and 2, the planar shape of each of the light control members 4 and 5 is almost the same as the emission surface 17 of the second light guide plate 7 and is a quadrangle.
- a resin material for example, polyethylene terephthalate (PET), PMMA, PC
- the first light control member 4 has a light diffusion function
- the second light control member 5 has a function of correcting the traveling direction of light.
- At least one of the inner surface (the surface facing the emission surface 17) and the outer surface (the surface facing the second light control member 5) of the first light control member 4 is a rough surface.
- the outgoing light from the outgoing surface 17 is diffused and supplied to the second light control member 5.
- the diffusion action by the rough surface makes it difficult for the emission promoting means (rough surface or the like) formed on the first light guide plate 6 and the second light guide plate 7 to be visually recognized from the outside of the liquid crystal display panel 3.
- the second light control member 5 has a prism surface on its outer surface (surface facing the liquid crystal display panel 3; upper surface). Such a light control member is called an upward prism sheet.
- a large number of prism-shaped protrusions 22 having a substantially triangular cross section extending in the longitudinal direction (X direction) of the respective incident surfaces 8 and 8 of the first light guide plate 6 and the second light guide plate 7 are continuously provided in a bowl shape on the prism surface. Is formed.
- the second light control member 5 deflects the traveling direction of the light diffused by the first light control member 4 toward the front direction of the emission surface 17 by a well-known function, and Increasing incident light at normal or near normal angles.
- luminance characteristic curves (solid line A, solid line B, and broken line C) under three lighting conditions (first lighting condition to third lighting condition) are drawn. Each curve A, B, C is obtained
- the lighting conditions are as follows.
- 'Dashed line C LEDs 14a to 14c of both point light source units 10 and 10 are lit (first illumination light and first light
- the shape drawn by the solid line B is substantially bilaterally symmetric with the solid line A with reference to the center line (C L) in the direction orthogonal to the incident surface 8 of the first light guide plate 6. That is, light emission of the first illumination light from the first emission surface 13 is suppressed in the emission suppression region (first emission suppression region) 18 of the first light guide plate 6.
- the emission gradually increasing area (first emission gradually increasing area) 20 the emission luminance gradually increases smoothly as the distance from the first emission suppressing area 18 increases.
- the emission luminance becomes substantially constant.
- the broken line C shows a slight difference in the direction from the highest emission luminance on the center line (CL) in the direction (Y direction) orthogonal to the incident surface 8 of the first light guide plate 6 to the side surface 15 at each end. As a whole, the output luminance is almost constant.
- the light utilization efficiency is higher than that of the conventional technology (surface light source device 100) described above. This is because the surface light source device 100 guides the inside of the light guide plate 101 and the light guide plate 102 for light guide length. This is because it is larger than that of the surface light source device 2 and the light use efficiency is likely to be lowered. Furthermore, as shown in FIG. 15, changing the light traveling direction by 180 degrees by the reflector 103 also reduces the light utilization efficiency. In the surface light source device 2, it is not necessary to change the light traveling direction by 180 degrees using such a reflector.
- the pair of (two) point light source units 10 can be arranged with the thickness reduced under the condition that the light emitting area of the surface light source device 2 is the same as that of the prior art. Therefore, the compactness of the surface light source device and the display device is facilitated, and the emission luminance of light (white light in the present embodiment) obtained by mixing (mixing) the emission colors of the LED groups is increased.
- first outgoing light outgoing light derived from the first illumination light
- second outgoing light outgoing light derived from the second illumination light
- the first emission light and the second emission light are emitted from the emission surface 17. Therefore, neither the first outgoing light nor the second outgoing light is likely to be light with insufficient color mixing. In the case of the present embodiment, since white light is generated in a mixed color, uniform white light with suppressed color unevenness is emitted from the emission surface 17.
- a surface light source device (second prior art) that is similar in appearance to the surface light source device 2 according to the present embodiment is known, but the configuration and action of the surface light source device 2 are as follows. The effect is quite different.
- FIG. 5 (a) is a partially enlarged cross-sectional view of the surface light source device 2 shown in FIGS. 1 to 3 (a) and 3 (b).
- FIGS. 5 (b) to 5 (d) are partial enlarged cross-sectional views illustrating four types of arrangements according to the first modification of the surface light source device 2 shown in FIG. 5 (a).
- FIGS. 5A to 5D the incident light surface 8 side of the second light guide plate 7 of the surface light source device 2 is partially enlarged.
- the frame 23 of the point light source unit 10 that supplies the second illumination light Is disposed on the lower end side of the first light guide plate 6, and a scat part 24 that shields light from the entire end face 15 of the first light guide plate 6 is formed. This prevents light leakage from the end face 15 of the first light guide plate 6 and incidence into the first light guide plate.
- the frame 23 may be made of plastic or metal.
- the entire surface of the end face (15) of the second light guide plate 7 is arranged in the same manner on the upper end side of the frame (23) of the point light source unit (10) for supplying the first illumination light.
- a skirt (24) that shields light closely is formed (see Fig. 2). This prevents light leakage from the end face 15 of the second light guide plate 6 and incidence into the second light guide plate.
- skirt portion 24 included in the frame 23 in FIG. 5 (c) is deleted, and, instead, a vertically symmetric shape is formed as shown in FIG. It is also possible to sandwich. In this case as well, light is prevented from entering the light guide plate 6 or 7 via the end face 15.
- an extra color is added to the light emitted from the emission surfaces 13 and 17 above the first and second emission promotion regions 21 (light that is sufficiently mixed; white light in this embodiment). Of light (light which is not sufficiently mixed and enters from the end face 15) is avoided. Accordingly, a more uniform mixed color light (white light in the present embodiment) is emitted from the emission surface 17.
- the upper end side where the skirt portion 24 of the frame 23 of the point light source unit 10 is not formed abuts against the upper end of the incident surface 8 of the second light guide plate 7 (FIG. 5 (b )), Or the flange 25 is closely engaged (hooked) with the exit surface 17 in the vicinity of the entrance surface 8 of the second light guide plate 7.
- FIGS. 5 (b), (c), and (d) can be modified and applied to the frame of the point light source unit (not shown) of the first light guide plate 6.
- FIG. 6 is a partial cross-sectional view according to Modification 2 of the surface light source device 2 shown in FIGS. 1 to 3 (a) and 3 (b).
- the end surface 15 of the first light guide plate 6 is positioned slightly retracted in the Y direction from the incident surface 8 of the second light guide plate 7.
- the second illumination light is prevented from entering the first light guide plate 6 directly from the end face 15 of the first light guide plate 6.
- the end surface 15 of the second light guide plate 7 is positioned in the Y direction with respect to the incident surface 8 of the first light guide plate 6. I am letting. Accordingly, the first illumination light is prevented from entering the second light guide plate 7 directly from the end face 15 of the second light guide plate 7.
- the same effect as the first modification can be expected.
- FIG. 7 is a diagram for explaining a third modification of the surface light source device 2 shown in FIGS. 1 to 3 (a) and 3 (b).
- the first light guide plate 6 and the second light guide plate 7 of the surface light source device 2 have a rectangular cross-sectional shape, and the emission surface 13 and the back surface 16 extend in parallel to each other, The back surface 11 extends in parallel. Thereby, the thickness dimension of the surface light source device 2 increases.
- the light emission in the vicinity of the incident surface 8 of the first light guide plate 6 and the second light guide plate 7 in the vicinity of the light mixture insufficient is more effectively suppressed, and the color mixture is made more uniform (this In the embodiment, it is expected to emit light that has been whitened.
- FIG. 8 is a diagram for explaining a modification 4 of the surface light source device 2 shown in FIGS. 1 to 3A and 3B.
- the emission surfaces 13 and 17 and the back surfaces 16 and 11 in the light emission suppression region 18 of the first light guide plate 6 and the second light guide plate 7 are formed in parallel.
- the thicknesses of the first light guide plate 6 and the second light guide plate 7 are gradually reduced as the distance from the incident surface 8 increases in each emission gradually increasing region 20 and each emission promoting region 21.
- the inclination angle of the back surfaces 16 and 11 forming the wedge shape of the first light guide plate 6 and the second light guide plate 7 is increased in a portion close to the end surface 15.
- the emitted light quantity at the position near the incident surface 8 and the position near the end face 15 of the first light guide plate 6 tends to be slightly insufficient. Also in the surface light source device 2 of the fourth modification, it is possible to obtain the same effect as the above-described surface light source devices 2.
- FIG. 9 is a diagram for explaining a modification 5 of the surface light source device 2 shown in FIGS. 1 to 3 (a) and 3 (b).
- the first light guide plate 6 and the second light guide plate 7 are deformed in the light emission gradually increasing regions 20.
- the outgoing light gradually increasing area of the first light guide plate (first outgoing light gradually increasing area) 20 is divided into two wedge-shaped regions (the cross-section is triangular) by a dividing line 26 that runs diagonally from the end on the entrance surface 8 side (on the back surface 16) to the end on the end surface 15 side (on the exit surface 13). It is classified. Of these two wedge-shaped regions, many light scatterers are mixed in the lower wedge-shaped region in FIG. 9, and light scatterers are mixed in the upper wedge-shaped region.
- the emission gradually increasing region (second emission gradually increasing region) 20 of the second light guide plate is an end portion on the incident surface 8 side.
- the matrix (base material) of the first light guide plate and the second light guide plate is a transparent resin.
- the light scatterer fine particles of a material having a refractive index different from that of the resin can be used.
- the light scattering ability of each of the first light guide plate 6 and the second light guide plate 7 in each of the emission gradually increasing regions 20 gradually increases from each of the emission suppression regions 18 toward each of the emission promotion regions 21, and Accordingly, the emission luminance gradually increases.
- the back surfaces 16 and 11 may be smooth surfaces similar to the emission suppression region 18 in the sections corresponding to the emission gradually increasing regions 20.
- examples of using the primary colors LEDs 14a, 14b, and 14c of R (red), G (green), and B (blue) as point light sources having different emission colors have been exemplified.
- this does not limit the invention.
- a plurality of white point light sources (white LEDs) with small variations in the color of the luminescent color may be used instead of the primary colors LEDs 14a, 14b, 14c. That is, commercially available white LEDs often have slight variations in color. For example, white light with redness, white light with blueness, white light with green power S, white light with yellowness, and so on.
- FIG. 10 (a) is a cross-sectional view of the surface light source device 2 according to Modification 7
- FIG. 10 (b) is an enlarged view of part A in FIG. 10 (a).
- Fig. 10 (c) is an enlarged view of part B in Fig. 10 (a).
- FIG. 11 is a diagram showing a luminance distribution curve of the emitted light from the second light guide plate 7 in correspondence with the schematic cross-sectional shape of the surface light source device 2 according to Modification 7.
- the point light source unit 10 constituted by a plurality of LEDs 14 is arranged along the incident surface 8 of the first light guide plate 6 and the second light guide plate 7.
- the first reflecting surfaces 30 and 31 are formed near the upper end of the incident surface 8 of each light guide plate 6 and 7, and the second reflecting surfaces 32 and 33 are formed near the lower end.
- the reflecting surfaces 30 and 32 provide inclined surfaces that each form an angle of ⁇ with respect to a virtual plane 34 parallel to the back surface 16.
- the inclination of the reflecting surface 30 and the inclination of the reflecting surface 32 are opposite to each other, and the first light guide plate 6 is formed so as to gradually increase in thickness as the distance from the incident surface 8 increases.
- the reflecting surfaces 31 and 33 also provide inclined surfaces that each form an angle of ⁇ with respect to the virtual flat surface 35 parallel to the emitting surface 17. To do.
- the inclination of the reflecting surface 31 and the inclination of the reflecting surface 33 are opposite to each other, and the second light guide plate 7 is formed so as to gradually increase in thickness as the distance from the incident surface 8 increases.
- the first light guide plate 6 has a range in which the first reflecting surface 30 and the second reflecting surface 32 are formed (from the incident surface 8).
- the plate thickness is gradually increased as the distance from the incident surface 8 in the direction of arrow XI in FIG.
- the positional force at which the first reflecting surface 30 and the second reflecting surface 32 disappear is also gradually reduced in thickness as it is directed in the direction of the arrow XI in FIG. 10 (a).
- the second light guide plate 7 has a range in which the first reflecting surface 31 and the second reflecting surface 33 are formed (from the incident surface 8 to a predetermined dimension Ml).
- the plate thickness is gradually increased as the distance from the incident surface 8 in the direction of arrow X2 in Fig. 10 (a) increases.
- the positional force at which the first reflecting surface 31 and the second reflecting surface 33 disappear is also indicated by the arrow X2 in FIG. Decrease the plate thickness gradually toward the direction.
- Ha illustrates the traveling direction of the internally reflected light when the reflecting surfaces 30 and 32 are not present, and Hb indicates the internally reflected light in the modified example 7 in which the reflecting surfaces 30 and 32 exist.
- the direction of travel is illustrated.
- Ha illustrates the traveling direction of the internally reflected light when the reflecting surfaces 31 and 33 are not present, and Hb indicates the interior in the modified example 7 where the reflecting surfaces 31 and 33 exist.
- the traveling direction of the reflected light will be exemplified.
- Hb is less likely to escape from the light guide plate 6 or 7 than Ha. Therefore, the emission from the emission surface 13 or the emission surface 17 (natural emission) in each emission suppression region 18 can be more effectively suppressed in the modified example 7.
- the modified example 7 is suitable when the light guide plates 6 and 7 have a wedge shape (see FIG. 2 (a)). Now, if the angle of inclination of the exit surface 13 of the first light guide plate 6 and the angle of inclination of the back surface 11 of the second light guide plate 7 are both oc, the advantage of the modified example 7 is exhibited especially when ex is large (steep slope). Is done.
- the internally propagated light of the light guide plates 6 and 7 is in the vicinity of the incident surface 8 and below the critical angle with respect to the exit surface 13 or the exit surface 17.
- the phenomenon of internal incidence at the incident angle is suppressed.
- each emission suppression region 18 functions better, emission before the emission colors are sufficiently mixed is suppressed, and color unevenness becomes less noticeable.
- Figures 10 (b) and 10 (c) are accompanied by numerical values. These numerical values are examples for making it easier to understand the present modification. As shown in FIGS. 10 (b) and 10 (c), the first light guide plate 6 and the second light guide plate 7 have the incident surface 8 thickness of 2.53 mm, ⁇ is 4 °, and Ml is 3 mm. Similarly, the reflective surfaces 30 to 33 are formed.
- FIG. 12 (a) is a plan view of the surface light source device 2 according to the modified example 8 assuming a case where no widening means is formed on the incident surface, and the first light guide plate 6 side is not shown. Yes.
- FIG. 12B is a plan view for explaining the surface light source device 2 according to the reference example compared with the modification example 8, and the first light guide plate 6 side is not shown.
- FIG. 12 (c) is a plan view of the surface light source device 2 according to Modification Example 8, and the illustration of the first light guide plate 6 side is omitted.
- FIG. 12 (d) is a partially enlarged view of FIG. 12 (c).
- FIG. 12 (e) is a view showing another embodiment of the widening means (corresponding to FIG. 12 (d)).
- Fig. 13 (a) is an enlarged view of the main part of Fig. 12 (d), and Fig. 13 (b) is taken along line Dl-D1 in Fig. 13 (a). It is sectional drawing.
- a surface light source device 2 is shown.
- a widening means 40 is formed on the incident surface 8 of the second light guide plate 7 so as to face the LED 14 on a one-on-one basis.
- the wide angle means 40 is arranged so as to face the LEDs 14 located at both ends of the plurality of LEDs 14 constituting the point light source unit 10.
- the widening means 40 in FIG. 12 (c) is shown enlarged.
- FIG. 12 (e) illustrates a wide-angle widening means 40 having a different structure from the wide-angle widening means 40 of FIG. 12 (d).
- the widening means 40 is disposed on the incident surface 8 of the second light guide plate 7 at portions corresponding to the LEDs 14 disposed at both ends in the longitudinal direction. .
- the light H ′ from the LED 14 spreads largely toward the longitudinal direction of the incident surface 8 after entering the second light guide plate 7 (see the light H in FIG. 13 (a)).
- the light is guided so that it does not spread in the thickness direction of the second light guide plate 7 ( ⁇ in FIG. 13 (b) does not change).
- the concave shape 41 see FIG.
- planar shape is a substantially circular arc shape, or a rough surface 42 (see FIG. 12) where a plurality of microscopic projections whose planar shape is approximately triangular is continuous. (see (e)) can be adopted.
- the side surfaces of the microprojections constituting the recess 41 and the rough surface 42 as the widening means 40 are formed so as to be orthogonal to the emission surface 17 orthogonal to the incident surface 8 (see FIG. 13B).
- the longitudinal direction of the incident surface 8 of the second light guide plate 7 depends on the emission profiles of the individual LEDs 14 constituting the point light source unit 10 and the arrangement of the LEDs 14. Light from the LEDs 14 arranged at both ends is unlikely to mix with light from other LEDs 14 inside the second light guide plate 7. As a result, the color mixture (for example, whitening) of the emitted light on both ends in the longitudinal direction of the incident surface 8 is likely to be insufficient.
- the light from the LEDs 14 arranged on both end sides of the incident surface 8 of the second light guide plate 7 is incident on the incident surface of the second light guide plate 7 by the widening means 40.
- the light is broadly spread toward the longitudinal direction of 8 (see Fig. 13 (a)). Therefore, it is possible to mix colors in a wide range with other 14 LEDs, which is advantageous in reducing variation in color distribution.
- FIG. 14 (a) schematically illustrates the surface light source device 2 according to Modification 8 as viewed from the second light guide plate side, in order to explain the results of the measurement performed in Modification 8.
- FIG. The measurement results are shown in Figures 14 (b) to 14 (e) using the UCS chromaticity diagram according to the standard CIE 1976.
- the display contents of each figure are as follows.
- u 'value CIE 1976 UCS chromaticity
- Fig. 14 (e) shows the v 'value (Fig. 14 (a)) obtained in FIG. 14 (a) for the chromaticity measurement force obtained at a plurality of positions on the opposite side of the incident surface 8 of the second light guide plate 7. It is a diagram showing the CIE 1976 UCS chromaticity diagram (coordinate values for the yellow-blue axis).
- FIGS. 14B to 14E indicates the position in the width direction of the second light guide plate 7 parallel to the incident surface 8.
- 14 (b) to 14 (e) dotted lines and wrinkles indicate u and v ′ of the surface light source device 2 (see FIG. 12 (a)) without forming the dent 41 in the incident surface 8.
- the alternate long and short dash line and country indicate u 'and V of the surface light source device 2 (see Fig. 12 (b)) in which the indentation 41 is formed on the incident surface 8 in correspondence with each LED14.
- solid lines and ⁇ indicate u and V of the surface light source device 2 (see FIG. 12 (c)) according to this modification.
- the incident surface 8 is a plane ( The difference in chromaticity on the cross section parallel to the incident surface 8 compared to the case where the depression 41 is formed on the incident surface 8 corresponding to all LEDs 10 (see Fig. 12 (a)) (see 12 (b)). Can be kept small.
- the surface light source device 2 has been described by taking the second light guide plate 7 side as an example, the surface light source device 2 may be similarly applied to the first light guide plate side. In that case, widening means 40 corresponding to the LEDs at both ends of the plurality of LEDs 14 arranged facing the incident surface 8 of the first light guide plate 6 are formed on the incident surface 8 of the first light guide plate 6.
- the second light control member 5 may be changed from an upward prism sheet to a downward prism sheet.
- the downward-facing prism sheet has a large number of prism-shaped projections on the surface (inner surface) facing the first light control member 4.
- the number of prism sheets arranged, the direction in which the prismatic protrusions extend, the prism may be changed as appropriate according to the light emission characteristics required for the surface light source device 2. In some cases, the arrangement of the prism sheet may be omitted.
- a polarization separation sheet may be disposed on the exit surface 13 side of the first light guide plate 6 as necessary. In this case, only the necessary polarization component can be used as the outgoing light by the polarization separation sheet.
- the first light guide plate 6 and the second light guide plate 7 are exemplified by a mode in which the emission promoting means is formed on the back surfaces 16 and 11 side.
- this does not limit the invention.
- an exit facilitating means for example, a rough surface
- an emission promoting means for example, a rough surface
- the point light source unit 10 is exemplified by a plurality of sets of R, G, B LEDs 14a, 14b, 14c arranged.
- R, G, B LEDs 14a, 14b, 14c this does not limit the invention.
- LEDs of colors other than R, G, and B may be used as appropriate.
- the light emission color to be combined is selected according to the desired color of the light emitted from the emission surface 17.
- the desired color of the light emitted from the emission surface 17 is white light.
- a combination of the point light sources of the first light source group and the second light source group is selected so that white light is generated with mixed colors.
- the use of R, G, and B primary color LEDs 14a-14c is a typical example.
- white light is used for backlighting color LCD panels.
- the reflection sheet 12 may be omitted.
- the inner surface of the case that houses the surface light source device 2 is excellent in light reflectivity, the inner surface of the case can be used in place of the reflective sheet 12.
- the surface light source device 2 or the display device 1 according to the present invention can be used in a posture other than the posture described in the above-described embodiments and modifications.
- the upper and lower expressions in the description of the above-described embodiments and modifications are expressions for facilitating the description.
- illumination light may be output downward from the surface light source device 2 and the liquid crystal display panel 3 disposed below the surface light source device 2 may be backlit with the illumination light.
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Abstract
Description
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JP2007555994A JPWO2007086456A1 (ja) | 2006-01-27 | 2007-01-25 | 面光源装置及び表示装置 |
US12/223,251 US20100271838A1 (en) | 2006-01-27 | 2007-01-25 | Surface Light Source Device and Display |
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JPWO2015141304A1 (ja) * | 2014-03-20 | 2017-04-06 | ソニー株式会社 | 発光装置および表示装置 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2007086456A1 (ja) | 2009-06-18 |
TW200734749A (en) | 2007-09-16 |
KR20080090961A (ko) | 2008-10-09 |
US20100271838A1 (en) | 2010-10-28 |
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