WO2010004994A1 - Module de source lumineuse, dispositif d'affichage à cristaux liquides, et dispositif d'éclairage - Google Patents

Module de source lumineuse, dispositif d'affichage à cristaux liquides, et dispositif d'éclairage Download PDF

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Publication number
WO2010004994A1
WO2010004994A1 PCT/JP2009/062373 JP2009062373W WO2010004994A1 WO 2010004994 A1 WO2010004994 A1 WO 2010004994A1 JP 2009062373 W JP2009062373 W JP 2009062373W WO 2010004994 A1 WO2010004994 A1 WO 2010004994A1
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WIPO (PCT)
Prior art keywords
light
light source
source module
light guide
liquid crystal
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PCT/JP2009/062373
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English (en)
Japanese (ja)
Inventor
澄人 西岡
秀明 名倉
透 花岡
啓至 酒井
雅昭 花野
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シャープ株式会社
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Publication of WO2010004994A1 publication Critical patent/WO2010004994A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the present invention relates to a light source module, a liquid crystal display device, and an illumination device that are used, for example, as a light source for general illumination and a backlight light source of a liquid crystal display device.
  • FPD Full Panel Display
  • a liquid crystal display device can be applied as a display device having various sizes from a small size to a large size, and can realize a display device with low power consumption, light weight, and high contrast.
  • the liquid crystal display device is not a self-luminous element having a light emitter inside, but a passive element that displays an image by introducing light from the outside. For this reason, an illumination device such as a front light or a backlight is usually attached to a liquid crystal display device which is a passive element.
  • the illumination device of the liquid crystal display device can be roughly classified into a direct type (direct) type and an edge light (side light) type.
  • the direct illumination device has advantages such as high brightness, high light irradiation efficiency, and applicability to a large display device.
  • an edge light type lighting device has advantages such as small size, thinness, and low power consumption.
  • the direct method realizes a surface light source with high luminance and high light irradiation efficiency by using direct light from the light sources arranged on the back of the liquid crystal panel. For this reason, a direct illumination system is usually used for a large liquid crystal display device.
  • a planar illumination device using a cold cathode tube is generally used for a liquid crystal display device.
  • Mercury enclosed in this cold cathode tube is a harmful substance to the human body and the environment, and its use is being restricted in recent years from the viewpoint of environmental protection.
  • a backlight unit (planar illumination device) using a light emitting diode (hereinafter referred to as “LED”) has been proposed as a planar illumination device that substantially does not contain harmful substances such as mercury.
  • Patent Documents 1 and 2 have been proposed as methods for enabling a uniform surface light source even with a small number of LEDs.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2008-154478 describes the brightness and darkness of the portion between the LEDs, which is generated when the number of LEDs is reduced, and V-grooves in a predetermined region between the LEDs. By providing, the light emitting surface is made uniform without any difference in brightness.
  • Patent Document 2 Japanese Patent Application Laid-Open No. 2007-259396 discloses that a cylindrical light guide is formed with a plurality of recesses at predetermined locations in the circumferential direction over the longitudinal direction, and from a region facing the surface on which the recesses are formed.
  • a uniform surface light source is realized by arranging a plurality of linear light sources to be emitted.
  • Patent Document 1 can be manufactured at a low cost by molding or the like for a small backlight.
  • a large-sized liquid crystal television cannot be manufactured by a method such as molding and is inexpensive. Can not be provided.
  • the mass production effect is small and it is difficult to reduce the cost.
  • a planar light guide is employed as in Patent Document 1, but with this configuration, there is a problem that the cost of the light guide increases and the weight also increases. In addition, a large number of LEDs are required, which increases the overall cost.
  • the above conventional example has a big problem that it is impossible to manufacture a large-sized liquid crystal television or a thinner backlight.
  • an object of the present invention is to provide an inexpensive light source module having uniform luminance, a liquid crystal display device having the light source module, and an illumination device having the light source module.
  • the light source module of the present invention is: A light incident part where light from a light source enters at least one end, a light guide part that guides light incident from the light incident part in the major axis direction, and light guided to the light guide part A light guide having a diffusing light diffusing portion; A reflection part that reflects the light diffused by the light diffusion part of the light guide, The light diffusing portion is provided on a surface of the light guide that does not face the reflecting portion.
  • the light diffusing portion is provided on a surface of the light guide that does not face the reflecting portion, the light diffusing portion is connected to the reflecting portion of the light guide. Compared with the case where it exists on the opposite surface, the light emitted from the light diffusion part and the light emitted from the light diffusion part and reflected by the reflection part can be expanded in the minor axis direction. Thus, both sides of the light guide can be illuminated.
  • the light diffusing portion is located on a surface of the light guide opposite to the facing surface facing the reflecting portion.
  • the light diffusing portion is located on the surface of the light guide opposite to the facing surface, the light emitted in the direction of the reflecting portion hits the light diffusing portion.
  • the thickness of the light guide is also diffused around the light guide, and as a result, the light reflected by the light diffusing portion can further illuminate the space between the adjacent light guides. .
  • the light diffusing portion is located on both side surfaces in the minor axis direction of the light guide.
  • the light diffusing unit is located on both side surfaces in the minor axis direction of the light guide, so that the light emitted from the light diffusing unit is further expanded in the minor axis direction. It is possible to further illuminate the space between the adjacent light guides.
  • the light diffusing portion is located on one side of both side surfaces in the minor axis direction of the light guide.
  • the light diffusing unit is located on one side of both side surfaces of the light guide in the short axis direction, the light emitted from the light diffusing unit is converted into the short axis. It can be spread in the direction and can illuminate between the adjacent light guides. Moreover, since the said light-diffusion part is provided only in the said single side
  • the light source module of one embodiment there are a plurality of the light guides, and the plurality of light guides are arranged at intervals in the minor axis direction.
  • the plurality of light guides are arranged with a space therebetween in the minor axis direction. Therefore, even if the interval between the adjacent light guides is increased, the adjacent light guides are arranged.
  • An inexpensive light source module with uniform brightness can be realized without darkening between the light bodies.
  • the plurality of light guides are arranged so that the major axis direction of each light guide coincides with the direction of gravity.
  • the plurality of light guides are arranged so that the major axis direction of each light guide coincides with the direction of gravity, warpage due to the weight of the light guides is generated. Can be suppressed, and the occurrence of uneven brightness can be suppressed.
  • the light guide has a polygonal column shape.
  • the light diffusing portion is formed by printing a diffusing material.
  • the liquid crystal display device of the present invention is LCD panel,
  • the light source module that irradiates light on the back of the liquid crystal panel,
  • the light guide of the light source module is located between the back surface of the liquid crystal panel and the reflection portion of the light source module.
  • the light source module since the light source module is provided, it is possible to illuminate the portion of the liquid crystal panel located between the adjacent light guides, and between the adjacent light guides. Will not darken.
  • a liquid crystal display device having a large screen size, even if the number of the light sources and the light guides is reduced, a liquid crystal display device that is inexpensive and uniform in brightness is obtained without darkening between the adjacent light guides. be able to. In addition, even if the space between the liquid crystal panel and the reflection portion of the light source module is narrowed, a space between the adjacent light guides is not darkened, and a thin liquid crystal display device can be obtained.
  • the liquid crystal display device has a stand for standing the liquid crystal panel and the light source module with respect to an installation surface, and the stand has a mounting surface mounted on the installation surface.
  • the mounting surface is formed so that the major axis direction of the light guide of the light source module coincides with the direction of gravity when the mounting surface is mounted on the installation surface.
  • the long axis direction of the light guide of the light source module matches the direction of gravity.
  • the occurrence of warpage due to the weight of the light guide can be suppressed, and the occurrence of luminance unevenness can be suppressed.
  • the display device of the present invention is characterized in that the light source module is used as backlighting.
  • the light source module since the light source module is provided, it is possible to illuminate the upper part between the adjacent light guides, and the adjacent light guides are not darkened.
  • the lighting device of the present invention is Comprising the light source module, This light source module is characterized by irradiating light to the light guide body side in the reflection section.
  • the illumination device of the present invention since the light source module is provided, it is possible to illuminate the upper part between the adjacent light guides, and the adjacent light guides are not darkened.
  • each of the light guides guides light incident on the light guide from the light source to at least one other surface of the light guide excluding the facing surface. Since the light diffusing unit that emits light to the outside of the light body is provided, a light source module that is inexpensive and uniform in luminance can be realized.
  • liquid crystal display device of the present invention since the light source module is provided, an inexpensive liquid crystal display device with uniform luminance can be realized.
  • the lighting device of the present invention since the light source module is provided, an inexpensive lighting device with uniform brightness can be realized.
  • FIG. 1A It is sectional drawing which shows 1st Embodiment of the liquid crystal display device of this invention. It is AA sectional drawing of FIG. 1A. It is sectional drawing explaining the case where the width
  • FIG. 1A is a sectional view showing a first embodiment of the liquid crystal display device of the present invention.
  • FIG. 1B shows an AA cross-sectional view of FIG. 1A.
  • the liquid crystal display device includes a liquid crystal panel 7 and a light source module 10 that irradiates light on the back surface of the liquid crystal panel 7.
  • the light source module 10 includes a reflection unit 4, a plurality of light guides 2, and a plurality of light sources 1.
  • the reflection unit 4 has a reflection surface 41 that reflects light.
  • the plurality of light guides 2 are disposed on the reflecting surface 41 side of the reflecting portion 4, extend in the major axis direction (X direction), and are arranged at intervals from each other in the minor axis direction (Y direction).
  • the major axis direction and the minor axis direction are orthogonal to each other.
  • the light guide 2 is located between the back surface of the liquid crystal panel 7 and the reflection unit 4.
  • a plurality of light sources 1 are provided corresponding to the respective light guides 2 and make light incident on the respective light guides 2.
  • the light guide 2 includes a light incident portion 2a where light from the light source 1 enters at least one end, a light guide portion 2b that guides light incident from the light incident portion 2a in the major axis direction, and It has a light diffusion part 2c for diffusing the light guided to the light guide part 2b.
  • the light diffusing unit 2 c emits the light incident from the light source 1 into the light guide 2 to the outside of the light guide 2.
  • the light diffusion part 2c is provided on the surface of the light guide 2 that does not face the reflection part. That is, the light diffusing unit 2 c is located on the surface (outgoing surface 22) opposite to the facing surface 23 facing the reflecting surface 41 of the reflecting unit 4 in the light guide 2.
  • the light source 1 is, for example, a white LED.
  • the light source 1 may be configured by at least one combination of a blue LED, a green LED, and a red LED.
  • the light guide 2 is made of, for example, a transparent material such as acrylic, polycarbonate, or glass.
  • the light guide 2 has a polygonal column shape. Since the light guide 2 occupies most of the components constituting the light source module 10, it is required to be inexpensive and lightweight.
  • the light incident surface 21, which is a surface on one end side of the light guide 2, is provided adjacent to the light source 1, and is a portion that allows the light emitted from the light source 1 to enter the light guide 2.
  • all the light rays of the light source 1 are coupled to the light guide 2 and the light rays propagating through the light guide 2 are totally reflected inside the light guide 2.
  • the cross-sectional area of the light guide 2 is preferably about the same as or slightly larger than the area of the light emitting surface of the light source 1. Specifically, it is preferably 1 to 10 times the light emitting area of the light source 1. More preferably, 1.5 times or more and 5 times or less are desirable.
  • the cross-sectional area of the light guide 2 is smaller than the light emitting surface of the light source 1. It doesn't matter.
  • the cross-sectional area of the light guide 2 is too larger than the cross-sectional area of the light-emitting surface of the light source 1, the dark portion D becomes large as described above, so it is preferable to make it 10 times or less.
  • the smaller the cross-sectional area of the light guide 2 the smaller the total weight of the light guide 2, which is advantageous in terms of cost and lightness.
  • the light diffusion part 2c is formed by printing ink containing diffusion particles (diffusion material) such as urethane beads. As long as the light that has entered the light guide 2 does not strike the light diffusion portion 2 c, the incident light from the light source 1 repeats total reflection within the light guide 2 and is hardly emitted from the emission surface 22.
  • diffusion particles diffusion material
  • the traveling light hits the light diffusing portion 2c
  • the traveling direction of the light is changed and the total reflection condition is deviated, and the light exiting surface 22 provided with the light diffusing portion 2c of the light guide 2 and its surroundings.
  • the light is emitted from the surface.
  • the light diffusing portion 2c has been described with ink containing diffusing particles.
  • the present invention is not limited to this, and for example, a similar effect such as a concave portion, a convex portion, or a textured surface may be obtained.
  • the number of light diffusion portions 2c near the light source 1 is reduced, and the number of light diffusion portions 2c increases as the distance from the light source 1 increases.
  • emitted in the longitudinal direction (X direction) of the light guide 2 can be equalize
  • the luminance of the surface light source in which a plurality of light guides 2 are arranged can be made uniform.
  • the reflection unit 4 has a sheet shape, and reflects the light diffused by the light diffusion unit 2 c of the light guide 2.
  • the reflector 4 reflects light emitted from the light guide 2 to the side opposite to the liquid crystal panel 7 toward the liquid crystal panel 7.
  • a reflecting plate 5 is provided at a position facing the other end surface of the light guide 2, and the reflecting plate 5 is the other end surface where the light guided through the light guide 2 is the facing surface of the light incident surface 21.
  • the light emitted from the light has a function of entering the light guide 2 again. Thereby, the light emitted from the light source 1 can efficiently reach the liquid crystal panel 7.
  • the reflection plate 5 When the reflection plate 5 is provided, it is necessary to optimize the light diffusion portion 2c in consideration of the reflected light beam.
  • the light source 1 may be provided in place of the reflecting plate 5 and light may be incident from both ends of the light guide 2. If the light source 1 is provided at both ends of the light guide 2, luminance uniformity can be easily performed as a surface light source by combining light sources having different light amounts.
  • An optical sheet 6 is provided on the back surface of the liquid crystal panel 7, and the optical sheet 6 diffuses light emitted from the light guide 2. That is, the optical sheet 6 is provided to make the luminance of the surface light source more uniform, and the light beam passes through the optical sheet 6 before entering the liquid crystal panel 7.
  • the movement of light within the light guide 2 will be described.
  • the movement of the light beam is indicated by an arrow.
  • the light beam guided in the light guide 2 hits the light diffusing unit 2c, the light beam is out of the total reflection condition.
  • the light beam is emitted around the liquid crystal panel 7 (upper surface) side or the reflective unit 4 (lower surface) side. .
  • the light diffusing unit 2c is positioned away from the reflecting unit 4, that is, the light diffusing unit 2c and the reflecting unit 4 are opposed to each other with the light guide 2 interposed therebetween.
  • the light beam emitted in the direction of the lower surface by the light diffusing portion 2c is diffused around the light guide 2 by the thickness of the light guide 2.
  • the light beam reflected by the reflecting portion 4 can illuminate the portion of the liquid crystal panel 7 positioned between the adjacent light guides 2, and the space between the adjacent light guides 2 becomes dark. And a surface light source with uniform brightness can be realized.
  • the light guide 2 may be thickened or the light diffusion portion 2 c may be optimized. As a result, the interval between the adjacent light guides 2 is increased. Therefore, a light source module with high luminance uniformity can be obtained at a lower cost.
  • FIG. 3A shows a configuration in which the light diffusing portion 2 c is provided on a surface close to the reflecting portion 4 of the light guide 2.
  • FIG. 3B shows a configuration in which the light diffusing portion 2 c is provided on a surface away from the reflecting portion 4 of the light guide 2.
  • the angle at which the light diffuser 2c deviates from the total reflection condition and the light beam exits from the light guide 2 is the same.
  • FIG. 3A and FIG. 3B only the main largest angles were described and the light guide of this invention and the conventional light guide were compared.
  • FIG. 3A the thickness of the light guide 2 and the upper part thereof are compared with those in FIG. 3B.
  • the distance from the light guide 2 to the optical sheet 6 can be shortened because the thickness of the light guide 2 can be additionally passed through the reflection portion 4.
  • FIG. 4 shows the angle dependency of the light beam emitted from the light guide 2.
  • a case where the light diffusion portion 2c is on the lower surface of the light guide 2 as shown in FIG. 3A (below the light diffusion portion) is indicated by a dotted line, and a case where the light diffusion portion 2c is on the upper surface of the light guide 2 as shown in FIG.
  • the light diffusing section is indicated by a solid line.
  • the vertical axis represents relative luminance (light flux amount)
  • the horizontal axis represents the angle at which light rays are emitted from the light guide 2. That is, the horizontal axis indicates the angular distribution on the XY plane, 0 ° indicates the direction perpendicular to the optical sheet 6 (that is, directly above), and 90 ° indicates the direction parallel to the optical sheet 6 (y direction: horizontal direction). ing.
  • FIG. 5 shows the relationship between the interval between the light guides 2 and the thickness required for uniform luminance.
  • the solid line in FIG. 5 is a case where the arrangement shown in FIG. 3B has the emission characteristic as shown by the solid line in FIG. 4, and the dotted line in FIG. 5 has the emission characteristic as shown by the dotted line in FIG. Is the case.
  • the light guide 2 uses ten rectangular shapes having a thickness (direction perpendicular to the optical sheet 6) of 6 mm, a width (Y direction) of 10 mm, and a length (X direction) of 560 mm.
  • the thickness (distance between the reflecting portion 4 and the optical sheet 6) necessary for uniforming the luminance was measured by simulation while changing the distance between the centers (light guide interval).
  • the thickness when the luminance distribution is ⁇ 10% was defined as the thickness required for uniform luminance.
  • the vertical axis indicates the thickness of the liquid crystal display device (distance between the reflecting portion 4 and the optical sheet 6) necessary for uniform luminance
  • the horizontal axis indicates the interval between the light guides 2.
  • the light diffusing portion 2c is collectively printed on any surface of the large area light guide plate 20 produced by extrusion or molding. At this time, by checking the propagation state of the light beam inside the light guide 2 by simulation or the like in advance, the optimized pattern of the light diffusion portion is printed on the light guide plate 20.
  • the light guide 2 can be produced in a large amount at a low cost.
  • a plurality of the same light guides 2 are produced by cutting the light guide plate 20 having a large area, but an elongated light guide bar is formed by extrusion or the like, and a print pattern is formed on the light guide bar. Also good. Further, after the light guide plate 20 is cut, a printing pattern may be printed and formed. Whichever method is used, the light guide 2 can be produced in a large amount at a low cost.
  • each light guide 2 has the light diffusion portion 2 c on the exit surface 22 that is not the facing surface 23 of the light guide 2.
  • the light emitted from the light diffusion portion 2c and the light emitted from the light diffusion portion 2c and reflected by the reflection portion 4 can be expanded in the minor axis direction.
  • the space between adjacent light guides 2 can be illuminated.
  • the light source module 10 having a low luminance and uniform brightness does not darken between the adjacent light guides 2. Can be realized.
  • the light diffusing portion 2c is located on the emission surface 22 opposite to the facing surface 23 of the light guide 2, the light emitted in the direction of the reflection portion 4 upon hitting the light diffusing portion 2c The thickness of the light guide 2 is also diffused around the light guide 2 and as a result, the light reflected by the light diffusion portion 2c can be further illuminated between the adjacent light guides 2.
  • the portion of the liquid crystal panel 7 positioned above between the adjacent light guides 2 can be illuminated, and between the adjacent light guides 2. Will not darken.
  • FIG. 7A shows a second embodiment of the liquid crystal display device of the present invention. The difference from the first embodiment will be described. In the second embodiment, the position of the light diffusion portion of the light source module is different. Note that the same reference numerals as those in the first embodiment have the same configurations as those in the first embodiment, and thus description thereof is omitted.
  • the light diffusion portions 2c of the light source module 10A are located on both side surfaces of the light guide 2 in the minor axis direction (Y direction).
  • FIG. 7B shows the light distribution on the optical sheet 6 in the light emitted from the light guide 2.
  • the horizontal axis indicates the position of the light guide 2 in the minor axis direction
  • the vertical axis indicates the relative light quantity.
  • 7B shows the light distribution on the optical sheet 6 when the light diffusion part 2c shown in FIG. 7A is arranged on both sides in the short axis direction
  • the thin line in FIG. 7B shows the light diffusion part 2c shown in FIG. Shows the light distribution on the optical sheet 6 when it is disposed on the surface of the light guide 2 close to the reflecting portion 4.
  • the light distribution is spread in the minor axis direction when the light diffusion portions 2c are arranged on both sides in the minor axis direction.
  • the space between the adjacent light guides 2 is not darkened.
  • a uniform surface light source can be obtained. That is, the light emitted from the light diffusing portion 2c can be further expanded in the minor axis direction, and the light guides 2 adjacent to each other can be further illuminated.
  • FIG. 8 shows a third embodiment of the liquid crystal display device of the present invention. The difference from the first embodiment will be described. In the third embodiment, the position of the light diffusion portion of the light source module is different. Note that the same reference numerals as those in the first embodiment have the same configurations as those in the first embodiment, and thus description thereof is omitted.
  • the light diffusion portion 2 c of the light source module 10 ⁇ / b> B is located on one side of both side surfaces in the minor axis direction (Y direction) of the light guide 2.
  • the space between the adjacent light guides 2 is not darkened.
  • a uniform surface light source can be obtained. That is, the light emitted from the light diffusing portion 2c can be further expanded in the minor axis direction, and the light guides 2 adjacent to each other can be further illuminated. Further, as compared with the second embodiment, since the light diffusing portion 2c only needs to be provided on one side, the manufacturing cost can be further reduced.
  • the light source modules of the first to third embodiments may be used for a lighting device. That is, for example, the illumination device has a configuration in which the liquid crystal panel 7 (optical sheet 6) is not provided in the liquid crystal display devices of the first to third embodiments, and the light source modules 10, 10A, 10B 4 is irradiated with light on the light guide 2 side (the direction facing the reflection surface 41 of the reflection portion 4).
  • the light source modules 10, 10A, and 10B are provided, the upper portion between the adjacent light guides 2 can be illuminated, and the space between the adjacent light guides 2 is not darkened.
  • FIG. 9A, 9B and 9C show a fifth embodiment of the liquid crystal display device of the present invention.
  • 9A is an exploded perspective view
  • FIG. 9B is an enlarged cross-sectional view
  • FIG. 9C is a front view.
  • the liquid crystal display device 100 includes a liquid crystal panel 107, a bezel 112 that holds the liquid crystal panel 107, a sheet body 106a for improving the front luminance of the screen, and the like. It has a diffusing plate 106b, a reflecting portion 104, and a chassis 111 that holds the entire apparatus.
  • the liquid crystal panel 107 and the reflection unit 104 have the same configuration as the liquid crystal panel 7 and the reflection unit 4 of the first embodiment.
  • the sheet body 106a and the diffusion plate 106b have the same configuration as that of the optical sheet 6 of the first embodiment.
  • a light source module 10C is disposed between the reflection unit 104 and the diffusion plate 106b.
  • the light source module 10C includes a light source 101 (such as an LED), a substrate 113 on which the light source 101 is mounted, a light guide 102, and a reflector 114 that efficiently couples light from the light source 101 to the light guide 102.
  • a light source 101 such as an LED
  • a substrate 113 on which the light source 101 is mounted such as an LED
  • a light guide 102 such as a light guide 102
  • a reflector 114 that efficiently couples light from the light source 101 to the light guide 102.
  • the light source 101 has the same configuration as the light source 1 of the first embodiment.
  • the light guide 102 has the same configuration as that of the light guide 2 of the first embodiment, and has a light diffusion portion similar to the light diffusion portion 2c of the first embodiment. Causes the light inside the light guide 102 to be emitted outside the light guide 102.
  • this light diffusing section is intended to emit the light inside the light guide 102 to the outside, so that the light diffusing section may be composed of a prism, a textured body, or the like as long as the total reflection condition is broken.
  • the plurality of light guides 102 are arranged so that the major axis direction (X direction) of each light guide 102 matches the direction of gravity.
  • the liquid crystal display device 100 is erected by the stand 120 so that the plurality of light guides 102 are arranged vertically.
  • the liquid crystal display device 100 includes a stand 120 for standing the liquid crystal panel 107 and the light source module 10C with respect to a horizontal installation surface S.
  • the stand 120 has a placement surface 120 a that is placed on the installation surface S.
  • the placement surface 120a is formed so that the major axis direction of the light guide 102 coincides with the direction of gravity when placed on the installation surface S.
  • the size of the light guide 102 is desirably about the size of the light source 101.
  • the LED made by Cree XP-E: size 3.2 ⁇ 3.2 mm square
  • the light guide 102 The cross section is desirably about 5 mm ⁇ 5 mm. Therefore, the volume of the light guide 102 can be reduced, which is advantageous in terms of weight and cost.
  • the light guide 102 When the light guide 102 is arranged in such a thin state, the light guide 102 is arranged so that the major axis direction (X direction) of the light guide 102 coincides with the horizontal direction orthogonal to the gravity direction.
  • the light body 102 is warped in the direction of gravity due to its own weight. At this time, if the amount of warpage varies for each light guide 102, the interval between the adjacent light guides 102, 102 varies, causing uneven brightness.
  • the plurality of light guides 102 are arranged so that the major axis direction (X direction) of each light guide 102 matches the direction of gravity.
  • the warp due to its own weight does not occur, and the interval between the adjacent light guides 102 can be kept constant. That is, the occurrence of uneven brightness can be suppressed.
  • the light guide 102 is formed thin and thin in order to reduce the thickness of the liquid crystal display device 100, the light guide 102 is placed vertically, so that the deflection of the light guide 102 due to gravity does not occur. Uneven brightness can be reliably suppressed.
  • the fluorescent tube when the fluorescent tube is placed vertically, mercury in the fluorescent tube is accumulated below, resulting in a biased luminance distribution, so the fluorescent tubes are generally arranged side by side, With the light guide 102 of the present invention, since the light source 101 such as an LED is used, there is no problem with the fluorescent tube.
  • both ends of the light guide body 102 may be simply fixed. However, the light guide body 102 is fixed as necessary and the light guide body 102 is bent or warped. It is preferable to suppress the deformation.
  • a fixing member that is sandwiched by point contact with both sides of the light guide 102 in the thickness direction of the light guide 102 may be used.
  • the light guide 102 can be easily installed at a fixed position by attaching the fixing member to the back surface of the light source module.
  • the fixing member is made of a metal wire, transparent resin, or the like, so that the light beam propagating through the light guide 102 is not hindered, and the light emitted from the light guide 102 is further prevented.
  • the light source module can be made uniform without obstructing the passage of the light source.
  • the light guides may be arranged so that the major axis direction of the light guides coincides with the horizontal direction, that is, the light guides may be arranged side by side and at the timing of applying the video signal to the liquid crystal panel.
  • backlight blinking which is a technique for inserting a black display between image displays, can be performed.
  • pseudo-impulse display can be realized, afterimage feeling can be suppressed, and power consumption can be reduced.
  • the present invention is not limited to the above-described embodiment.
  • you may provide the light-diffusion part 2c in at least one surface other than the output surface 22 and side surface of the light guide 2 except the opposing surface 23 in the light guide 2.
  • the extending direction (major axis direction) of the light guide 2 and the arrangement direction (short axis direction) of the light guides 2 do not have to be orthogonal to each other, and may be different from each other.
  • the light source module may have at least one light guide 2.
  • the light source modules of the first to third and fifth embodiments may be used as backlighting in a display device other than the liquid crystal display device.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Liquid Crystal (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention concerne un dispositif peu coûteux de source lumineuse de zone de luminance uniforme. Un dispositif de source lumineuse de zone (10) comprend un réflecteur (4), plusieurs conducteurs de lumière (2), et plusieurs sources lumineuses (1). Le réflecteur (4) comprend une surface réfléchissante (41) qui reflète la lumière. Les conducteurs de lumière (2) sont disposés sur le côté de la surface réfléchissante (41) du réflecteur (4) et, en plus de s'étendre dans la direction X, ils sont disposés dans la direction Y à des intervalles. Les sources lumineuses (1) sont prévues, respectivement, pour chaque conducteur de lumière (2) et font entrer la lumière dans les conducteurs de lumière (2) respectifs. Chaque conducteur de lumière (2) comprend des parties de diffusion de lumière (2c). Les parties de diffusion de lumière (2c) émettent de la lumière qui est émise depuis la source lumineuse (1) et entre dans le conducteur de lumière (2), à l'extérieur du conducteur de lumière (2). Les parties de diffusion de lumière (2c) sont positionnées sur une surface d'émission (22) du conducteur de lumière (2) sur le côté opposé depuis la surface (23) face à la surface réfléchissante (41) du réflecteur (4).
PCT/JP2009/062373 2008-07-08 2009-07-07 Module de source lumineuse, dispositif d'affichage à cristaux liquides, et dispositif d'éclairage WO2010004994A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2008-177966 2008-07-08
JP2008177966 2008-07-08
JP2009158546A JP4607225B2 (ja) 2008-07-08 2009-07-03 光源モジュール、液晶表示装置および照明装置
JP2009-158546 2009-07-03

Publications (1)

Publication Number Publication Date
WO2010004994A1 true WO2010004994A1 (fr) 2010-01-14

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JP (1) JP4607225B2 (fr)
WO (1) WO2010004994A1 (fr)

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WO2014095921A2 (fr) * 2012-12-20 2014-06-26 Osram Opto Semiconductors Gmbh Dispositif lumineux

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JP2011174579A (ja) 2010-02-25 2011-09-08 Jatco Ltd 自動変速機の油温補正装置
WO2011118563A1 (fr) * 2010-03-26 2011-09-29 日本電気株式会社 Plaque de guidage de lumière à déviation, appareil d'éclairage et appareil d'affichage du type projection
JP2013122852A (ja) * 2011-12-12 2013-06-20 Konica Minolta Advanced Layers Inc 光学機能素子、導光板、照明装置、及び光学機能素子の製造方法
JP2014127335A (ja) * 2012-12-26 2014-07-07 Sumitomo Chemical Co Ltd 面光源装置
TWI548918B (zh) 2015-04-13 2016-09-11 揚昇照明股份有限公司 光源模組
JP2017050276A (ja) * 2015-08-19 2017-03-09 Jsr株式会社 導光板用組成物、導光板及びその製造方法、エッジライト型面発光装置
JP6682834B2 (ja) * 2015-12-04 2020-04-15 オムロン株式会社 導光板、面光源装置、表示装置、及び電子機器

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JP2001236809A (ja) * 2000-02-24 2001-08-31 Matsushita Electric Works Ltd エッジライトパネル

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JPH11167808A (ja) * 1997-12-04 1999-06-22 Hitachi Ltd 照明装置およびバックライトを有する液晶表示装置
JP2001236809A (ja) * 2000-02-24 2001-08-31 Matsushita Electric Works Ltd エッジライトパネル

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014095921A2 (fr) * 2012-12-20 2014-06-26 Osram Opto Semiconductors Gmbh Dispositif lumineux
WO2014095921A3 (fr) * 2012-12-20 2014-11-27 Osram Opto Semiconductors Gmbh Dispositif lumineux

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JP4607225B2 (ja) 2011-01-05

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