WO2012133118A1 - Dispositif d'éclairage et écran - Google Patents

Dispositif d'éclairage et écran Download PDF

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Publication number
WO2012133118A1
WO2012133118A1 PCT/JP2012/057368 JP2012057368W WO2012133118A1 WO 2012133118 A1 WO2012133118 A1 WO 2012133118A1 JP 2012057368 W JP2012057368 W JP 2012057368W WO 2012133118 A1 WO2012133118 A1 WO 2012133118A1
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WO
WIPO (PCT)
Prior art keywords
light
rod
light receiving
lighting device
reflecting
Prior art date
Application number
PCT/JP2012/057368
Other languages
English (en)
Japanese (ja)
Inventor
敦幸 田中
Original Assignee
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2012133118A1 publication Critical patent/WO2012133118A1/fr

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Classifications

    • 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
    • G02B6/0005—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 of the fibre type
    • G02B6/001—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 of the fibre type the light being emitted along at least a portion of the lateral surface of the fibre
    • 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
    • G02B6/0018—Redirecting means on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—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
    • G02B6/0021—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 for housing at least a part of the light source, e.g. by forming holes or recesses
    • 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
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • 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 an illumination device and a display device, and more particularly to an illumination device and a display device including a light source and a light guide that guides light from the light source.
  • a backlight device (illumination device) that irradiates light to a liquid crystal panel is also mounted on a liquid crystal display device (display device) on which a non-light emitting liquid crystal panel (illuminated member) is mounted.
  • the backlight device is preferably configured to generate planar light that spreads over the entire area of the planar liquid crystal panel.
  • the backlight device for irradiating the liquid crystal panel with light is roughly classified into a direct type and an edge light type (also referred to as a side light type).
  • the direct type backlight device has a structure in which a plurality of LEDs (Light Emitting Diodes) serving as light sources are arranged on the back side of an optical sheet such as a diffusion plate. And it is comprised so that the light from several LED may be spread
  • the dimming control for each area adjusts the brightness of each area of the backlight device in synchronization with the brightness of each area of the display image by independently controlling a plurality of LEDs. (Also called local dimming control or area active control) can be realized. As a result, the contrast of the liquid crystal display device can be improved and the power consumption can be reduced.
  • the portion of the liquid crystal panel on the light source is likely to have higher brightness than the other portions, and uneven brightness tends to occur in the liquid crystal panel. For this reason, in order to suppress the luminance unevenness of the liquid crystal panel, it is necessary to increase the distance between the LED and the diffusion plate. Therefore, there is an inconvenience that it is difficult to reduce the thickness of the backlight device.
  • the unevenness of brightness is more likely to occur because the arrangement interval of the LEDs is increased. In this case, since it is necessary to increase the distance between the LED and the diffusion plate, it is more difficult to reduce the thickness of the backlight device. Therefore, it is difficult for the conventional direct-type backlight device to realize both cost reduction and thickness reduction at the same time.
  • the edge light type backlight device has a structure in which a light source such as an LED is disposed on the side surface of the light guide plate.
  • the light emitted from the light source enters the light guide plate from the side surface of the light guide plate, and is guided inside the light guide plate to be emitted toward the liquid crystal panel.
  • the light guide plate spreads light from the light source in the surface direction and then emits it as planar light to the liquid crystal panel side, so that the backlight device can be easily thinned. Is possible.
  • the light guide plate since the light guide plate usually has the same area as the liquid crystal panel, there is a disadvantage that it is difficult to reduce the weight of the backlight device.
  • Patent Document 1 a planar light source device including a plurality of light guide bars arranged at a predetermined interval from each other and a plurality of point light sources (LEDs) arranged to face the end faces of the light guide bars.
  • a display device including a lighting device is disclosed.
  • this planar light source device a plurality of light guide rods are provided instead of the light guide plate, and the light guide plates having the same area as the liquid crystal panel are provided by arranging the plurality of light guide rods at a predetermined interval from each other. It is possible to reduce the weight as compared with the case of using.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to reduce the cost, weight, and thickness while suppressing the occurrence of uneven brightness in the illuminated member. It is providing the illuminating device and display apparatus which can aim at.
  • an illuminating device of the present invention is an illuminating device disposed on the back side of a member to be illuminated, and has a plurality of light sources and a function of guiding light from the light sources, and A plurality of light guides arranged at a predetermined interval; and a reflection wall arranged between the light guides, wherein the light guide receives a light emitted from the light source; A light receiving portion disposed on the back side of the light receiving portion, and a first reflecting surface that reflects incident light toward the rod-like portion, the rod-like portion extending from the light receiving portion.
  • the side wall includes a first light emission processing unit for emitting light to the outside, and the reflection wall includes a second reflection surface that reflects light from the light guide to the illuminated member side.
  • this lighting device has a function of guiding light from the light source, and is provided with a plurality of light guides arranged at predetermined intervals.
  • the quantity of the member (light guide) which light-guides decreases.
  • the light receiving unit including the first reflecting surface that reflects the incident light toward the rod-shaped portion
  • the light incident on the light receiving unit is reflected by the first reflecting surface and is reflected on the rod-shaped portion.
  • emitting the light from a light-receiving part outside is provided in the side wall of a rod-shaped part, the light from a light-receiving part radiate
  • the light emitted from the light guides is It becomes easy to reach a portion corresponding to a portion between the light guides in the illuminated member (a portion directly above the light guides).
  • the first reflecting surface is formed by a curved surface. If comprised in this way, since it can make it easy to make the light which injected into the light-receiving part total reflection with a 1st reflective surface, light can be made hard to leak from a light-receiving part.
  • the light receiving portion is preferably formed in a shape using a part of an ellipsoid. If comprised in this way, since the light which injected into the light-receiving part can be made to make it easier to totally reflect with a 1st reflective surface, light leakage can be suppressed more. Further, the light incident on the light receiving part can be easily reflected in a predetermined direction (rod-like part side).
  • the long axis passing through the two focal points of the ellipsoid is inclined with respect to the extending direction of the rod-shaped portion.
  • the light receiving unit is formed in a shape using a part of an ellipsoid
  • the light receiving unit is formed using a part of a shape obtained by combining two ellipsoids. One focal point of each ellipsoid coincides.
  • the light receiving part is sandwiched between two bar-shaped parts, and the first reflecting surface is formed so as to disperse and reflect the light incident on the light receiving part to the two bar-shaped parts. If comprised in this way, the light from one light source can be disperse
  • the distance between the reflecting wall and the member to be illuminated is smaller than the distance between the rod-shaped portion and the member to be illuminated. If comprised in this way, since the quantity of the light reflected by the reflecting wall will increase, the quantity of the light which reaches
  • the second reflecting surface may be inclined at an angle larger than 45 degrees with respect to the normal line on the back surface of the illuminated member.
  • the second reflecting surface may include a concave curved surface or a step surface.
  • the illumination device preferably further includes a fixing member that covers the illuminated member side of the light receiving unit and fixes the light receiving unit.
  • a second light emitting processing section for changing the traveling direction of light from the light receiving section and emitting light from the front surface of the rod-shaped section is formed on the back surface of the rod-shaped section. If comprised in this way, since the light from a light-receiving part radiate
  • the front surface of the rod-shaped portion is preferably formed by a curved surface. If comprised in this way, light will radiate
  • the rod-shaped portion is formed in a tapered shape as the distance from the light receiving portion increases.
  • a recess for accommodating at least the light emitting surface of the light source is formed on the back surface of the light receiving unit. If comprised in this way, since the height from the back surface of a light source to the front surface of a light guide can be made small, an illuminating device can be made thinner. Further, the light emitted from the light source can be efficiently incident on the light receiving unit.
  • the light guides are continuously arranged so that a plurality of light guides extend in a predetermined direction and are integrally provided. If comprised in this way, a some light guide can be handled as one member, and the assembly workability
  • the display device of the present invention includes the illumination device having the above-described configuration and a display panel illuminated by the illumination device.
  • the present invention has the function of guiding the light from the light source, and by providing a plurality of light guides arranged at a predetermined interval from each other, it is approximately the same as the member to be illuminated. Compared with the case where a light guide plate having an area of 1 is used, the amount of a light guide member (light guide) is reduced. As a result, the lighting device can be reduced in weight and the material cost can be reduced.
  • the light incident on the light receiving part is reflected by the first reflecting surface and guided to the rod-like part.
  • emitting the light from a light-receiving part outside is provided in the side wall of a rod-shaped part, the light from a light-receiving part radiate
  • the light emitted from the light source can be irradiated into the illuminated member as planar light, so that the illumination device can be thinned and the occurrence of uneven brightness in the illuminated member can be suppressed. Can do.
  • a reflection wall including a second reflecting surface that reflects light from the light guides toward the illuminated member between the light guides
  • the light emitted from the light guides is reflected by the illuminated member. It becomes easy to reach the corresponding part (the part directly above between the light guides) between the light guides. Thereby, even if it is a case where the space
  • FIG. 1 is a cross-sectional view illustrating a schematic structure of a liquid crystal display device according to a first embodiment of the present invention. It is the top view which showed the structure of the light guide unit periphery of FIG. It is the perspective view which showed the structure of the light guide unit periphery of FIG. It is the top view which showed the structure of the light guide unit of FIG. It is the perspective view which showed the structure of the light guide unit of FIG. It is the side view which showed the structure of the light guide of FIG. 1, and a fixing member. It is the expanded sectional view which showed the structure of the light guide of FIG. It is the expanded sectional view which showed the structure of the light guide of FIG. It is the enlarged plan view which showed the structure of the light guide of FIG.
  • the display device 1 constitutes, for example, a liquid crystal television receiver (not shown).
  • the display device 1 includes a display panel 2 (illuminated member) and a lighting device 10 that is disposed on the back side of the display panel 2 and illuminates the display panel 2.
  • FIG. 1 is drawn with the display surface side of the display panel 2 facing up, and therefore the expression “upper side” in the following description means the front side of the display panel 2. Become. Further, the “rear surface (lower side in FIG. 1)” on the rear surface of the display panel 2 is an orientation concept applied to other components.
  • the display panel 2 is composed of a liquid crystal display panel, and has two glass substrates that sandwich a liquid crystal layer (not shown).
  • the display panel 2 displays an image by being illuminated by the illumination device 10.
  • the illuminating device 10 is an edge light type backlight device, and includes a plurality of light guide units 20 including a light guide 21 described later as a constituent element, and a plurality of light sources 11 that emit light toward the light guide unit 20.
  • the fixing member 12 that fixes the light guide unit 20, the reflection wall 13 (see FIG. 2) disposed between the light guide units 20, and the reflection disposed on the back side (lower side) of the light guide unit 20.
  • the sheet 14 includes a diffusion plate 15 and an optical sheet 16 that are disposed on the front side (upper side) of the light guide unit 20, and a backlight chassis 17 that houses these.
  • the light guide unit 20 (light guide 21 to be described later) has a function of guiding light from the light source 11 while totally reflecting it and emitting it from a rod-shaped portion 23 to be described later.
  • Examples of the material of the light guide unit 20 include translucent resins such as polycarbonate resin and acrylic resin. The detailed structure of the light guide unit 20 and the reflection wall 13 will be described later.
  • the light source 11 is configured to emit light toward the light guide unit 20 (upward). Moreover, the light source 11 is comprised by LED which radiate
  • the light source 11 may be composed of, for example, a red light emitting element, a green light emitting element, and a blue light emitting element, or may be composed of a blue light emitting element or an ultraviolet light emitting element and a phosphor. If the light source 11 is composed of a red light emitting element, a green light emitting element, and a blue light emitting element, the color reproduction range can be widened. If the light source 11 is composed of a blue light emitting element or an ultraviolet light emitting element and a phosphor, the cost of the light source 11 can be reduced.
  • the plurality of light sources 11 are mounted on a mounting board (not shown).
  • This mounting substrate is for supplying power to the light source 11 and is formed so that the intensity of light emitted from the light source 11 can be adjusted for each light source 11. Further, the mounting substrate may be formed so as to extend in the A direction (direction in which the light guide unit 20 extends) along the back surface of the light guide unit 20, for example.
  • a resist film serving as a protective film may be formed on the front surface (mounting surface) of the mounting substrate.
  • the resist film is not particularly limited, but is preferably white having a function of reflecting light. If comprised in this way, it is possible to suppress that the light which reached
  • the reflective sheet 14 has a function of reflecting light traveling toward the opposite side (lower side) of the display panel 2 to the display panel 2 side.
  • the diffusion plate 15 has a function of diffusing light from the light guide unit 20, the reflection wall 13, or the reflection sheet 14 and emitting it to the display panel 2 side (optical sheet 16 side).
  • the optical sheet 16 is composed of a plurality of sheets such as a prism sheet and a lens sheet, and has a function of diffusing light from the diffusion plate 15 and condensing it at a predetermined viewing angle.
  • the diffusion plate 15 is disposed at a predetermined interval (about several mm) from the light guide unit 20.
  • the diffusion plate 15 may be placed on the fixing member 12 or may be placed directly on the light guide unit 20.
  • the diffusion plate 15 and the optical sheet (such as a prism sheet or a lens sheet) 16 are provided as necessary and may be omitted.
  • the backlight chassis 17 is formed, for example, by bending a metal plate.
  • the light guide unit 20 is formed so as to extend in the longitudinal direction (A direction) (predetermined direction) of the display panel 2, and in the short direction (A direction) of the display panel 2. Are arranged at a predetermined interval in the B direction perpendicular to the direction B. In FIG. 2, three light guide units 20 are arranged, but one, two, four or more light guide units 20 may be arranged.
  • the light guide unit 20 is configured by a plurality of (for example, three) light guides 21 that are continuously arranged so as to extend in the A direction and are integrally provided. .
  • the light guide unit 20 may be configured by separately arranging a plurality of light guides 21 in the A direction.
  • Each light guide 21 includes a light receiving portion 22 and two rod-like portions 23 provided on both sides of the light receiving portion 22 in the A direction. That is, the light receiving portion 22 is sandwiched between two rod-like portions 23.
  • one light guide 21 (one light receiving portion 22, two rod-like portions 23) and one light source 11 are provided for each region where the display panel 2 is divided into the A direction and the B direction. Therefore, it is possible to control the brightness for each region of the display panel 2 by controlling the intensity of light emitted from the light source 11 in synchronization with the brightness of the display image in each region. That is, dimming control for each region (also called local dimming control or area active control) can be performed. Thereby, it is possible to increase the contrast of the display image and to reduce the power consumption of the lighting device 10.
  • the light receiving unit 22 is arranged so as to cover the light source 11 as shown in FIGS. Further, as shown in FIGS. 6 and 7, a recess 22 b that houses at least the light emitting surface (upper surface) of the light source 11 is formed in the back surface 22 a of the light receiving unit 22.
  • An upper surface 22c (see FIG. 7) of the recess 22b is a light receiving surface that receives light from the light source 11.
  • the front surface 22d (first reflection surface) of the light receiving unit 22 is formed by a reflection surface made of a curved surface.
  • the light receiving unit 22 is formed using a part of a shape obtained by combining two ellipsoids E.
  • This ellipsoid E is a spheroid obtained by using the ellipse as a rotation axis with its long axis L1 (axis passing through the focal points F1 and F2) as a rotation axis.
  • the rotation axis (long axis L1) of the ellipsoid E is inclined with respect to the direction in which the rod-like portion 23 extends (direction A). In other words, the rotation axis (long axis L1) of the ellipsoid E is inclined with respect to the light emitting direction of the light source 11 (directions perpendicular to the A direction and the B direction).
  • one focal point F1 of each of the two ellipsoids E coincides.
  • the recessed part 22b is provided in the area
  • the rod-shaped portion 23 is formed to extend in the A direction as shown in FIG. As shown in FIGS. 5 and 10, the rod-like portion 23 includes a light emitting surface (front surface) 23 a, a back surface 23 b (see FIG. 6), and a pair of side walls 23 c.
  • a processed portion 23d for emitting light from the light receiving portion 22 to the outside is formed on the side wall 23c.
  • the processing unit 23d has a function of refracting or reflecting the light guided while being totally reflected so as to be emitted in the B direction without being totally reflected. For this reason, as shown in FIG. 11, the light reaching one side wall 23c is emitted to the outside as it is, or is emitted to the outside from the other side wall 23c.
  • the processing portion 23d may be formed by a plurality of triangular prisms as shown in FIG. 11, or by a plurality of dots by a plurality of lenses or dot-type printing using white ink (white paint). It may be formed.
  • the processed portion 23d may be formed over the entire region from the upper end to the lower end of the side wall 23c, or may be formed in a partial region from the upper end to the lower end of the side wall 23c.
  • the pair of side walls 23 c are formed so as to approach each other as the distance from the light receiving unit 22 increases.
  • the rod-like portion 23 is formed in a tapered shape as the distance from the light receiving portion 22 increases.
  • the amount of light that is guided decreases as the distance from the light receiving portion 22 decreases.
  • the probability that the light reaches the processing portion 23d as the distance from the light receiving portion 22 increases. For this reason, it is possible to make uniform the quantity of the light radiate
  • the amount of light reaching the tip of the rod-shaped portion 23 is reduced, it is possible to reduce the amount of light emitted from the tip of the rod-shaped portion 23 to the outside or incident on the adjacent rod-shaped portion 23.
  • a processing portion 23e (second light emitting processing portion) that changes the traveling direction of light from the light receiving portion 22 and emits light from the light emitting surface 23a is formed on the back surface 23b.
  • the light that has reached the processed portion 23e is reflected or refracted by the processed portion 23e and does not satisfy the total reflection condition, and is emitted from the light emitting surface 23a to the display panel 2 side.
  • the processed portion 23e is formed of, for example, a hemispherical convex portion that protrudes downward.
  • the process part 23e may be formed by the dot part which consists of a triangular prism or white ink, for example.
  • the plurality of processed parts 23e are arranged at a predetermined interval in the A direction. This interval decreases as the distance from the light receiving unit 22 increases. That is, the formation density of the processed part 23e on the side opposite to the light receiving part 22 (the front end side) is higher than the formation density of the processed part 23e on the light receiving part 22 side.
  • the amount of light that is guided decreases as the distance from the light receiving portion 22 decreases, but the probability of light reaching the processed portion 23e increases by increasing the formation density of the processed portion 23e as the distance from the light receiving portion 22 increases. . For this reason, it is possible to make uniform the quantity of the light radiate
  • the formation density of the processed portion 23e on the back surface 23b is smaller than the formation density of the processed portion 23d on the side wall 23c. Therefore, the light in the rod-shaped part 23 is mainly radiate
  • the light guide unit 20 (light guide 21) is fixed by a fixing member 12 as shown in FIGS.
  • the fixing member 12 is provided so as to cover the front surface 22 d side of the light receiving unit 22. Further, the fixing member 12 may be provided with an engaging portion (not shown), and the fixing member 12 may be fixed to the mounting substrate by the engaging portion. Alternatively, the fixing member 12 may be fixed to the backlight chassis 17 together with the mounting substrate and the reflection sheet 14 by an engaging portion.
  • Examples of the material of the fixing member 12 include white polycarbonate resin and diffusible resin in which a diffusing material is contained in a transparent resin.
  • the reflection wall 13 has the same length as the light guide unit 20 and is disposed so as to extend in the same direction (A direction) as the light guide unit 20. Further, the reflection wall 13 is disposed at an intermediate position between the light guide units 20.
  • the reflection wall 13 includes a reflection surface 13 a (second reflection surface) that reflects light emitted in the B direction from the side wall 23 c of the light guide 21 toward the display panel 2.
  • the apex angle ⁇ 1 is preferably about 120 degrees.
  • the distance between the reflecting wall 13 and the diffusion plate 15 (or the display panel 2) is smaller than the distance between the rod-shaped portion 23 and the diffusion plate 15 (or the display panel 2). That is, the reflecting wall 13 is formed closer to the diffusion plate 15 (or the display panel 2) than the rod-like portion 23.
  • the reflecting wall 13 is fixed to the backlight chassis 17 through a through hole (not shown) provided in the reflecting sheet 14, for example.
  • the reflection wall 13 may be fixed to the reflection sheet 14 using an adhesive or the like.
  • the reflection wall may be formed integrally with the backlight chassis 17 and the reflection wall may protrude upward through an opening (not shown) provided in the reflection sheet 14.
  • the plurality of light guides 21 having a function of guiding light from the light source 11 are arranged at a predetermined interval in the B direction.
  • the quantity of the member (light guide 21) which light-guides decreases.
  • the lighting device 10 can be reduced in weight and the material cost can be reduced.
  • the front surface (reflection surface) 22d of the light receiving unit 22 so as to reflect the light incident on the light receiving unit 22 toward the rod-shaped unit 23, the light incident on the light receiving unit 22 is The light is reflected by the front surface (reflection surface) 22d and guided to the rod-like portion 23.
  • the processing part 23d for emitting the light from the light receiving part 22 to the outside is provided on the side wall 23c of the rod-like part 23, the light from the light receiving part 22 is emitted to the outside from the side wall 23c of the rod-like part 23.
  • the light emitted upward from the light source 11 is emitted so as to spread in the B direction from the rod-shaped portion 23 after being spread in the A direction.
  • the display panel 2 can be illuminated with the light emitted from the light source 11 as planar light, so that the illuminating device 10 can be reduced in thickness and the occurrence of uneven brightness in the display panel 2 can be suppressed. can do.
  • the reflecting wall 13 including the reflecting surface 13a that reflects the light from the light guide 21 toward the display panel 2 is provided between the light guides 21 (light guide units 20).
  • the light emitted from the light guide 21 is likely to reach the portion directly above the light guides 21 in the display panel 2.
  • interval of light guides 21 (light sources 11) is extended and arrange
  • the illuminating device 10 can be made thinner.
  • the front surface (reflective surface) 22d of the light receiving unit 22 by forming the front surface (reflective surface) 22d of the light receiving unit 22 with a curved surface, the light incident on the light receiving unit 22 can be easily totally reflected by the front surface 22d. Thereby, it is possible to prevent light from leaking from the light receiving unit 22.
  • the light incident on the light receiving part 22 can be more easily reflected by the front surface 22d. Leakage can be further suppressed. Further, the light incident on the light receiving portion 22 can be easily reflected in a predetermined direction (the rod-shaped portion 23 side).
  • the incident angle of light with respect to the back surface 23b of the rod-like portion 23 can be controlled.
  • one focal point F1 of each of the two ellipsoids E forming the light receiving unit 22 is matched, and the light source 11 is disposed in the vicinity of the focal point F1.
  • the light emitted from one light source 11 can be dispersed in the two rod-like portions 23 by the light receiving portion 22. For this reason, the number of the light sources 11 can be reduced.
  • the distance between the reflecting wall 13 and the display panel 2 is made smaller than the distance between the rod-shaped portion 23 and the display panel 2. Therefore, since the amount of light reflected by the reflecting wall 13 can be increased, the amount of light reaching the portion directly above the light guides 21 in the display panel 2 can be increased. it can. Thereby, it can suppress more that the brightness
  • a part of the light reflected by the reflecting wall 13 is adjacent. Leak into the area. That is, the light reflected by the reflecting wall 13 reaches the portion of the display panel 2 above the reflecting wall 13 in a diffused state. Thereby, since it can suppress that a dark line arises in the part directly above the reflective wall 13 of the display panel 2, it can suppress that the brightness
  • the fixing member 12 is formed so as to cover the display panel 2 side of the light receiving unit 22. Accordingly, even if a part of the light leaks from the light receiving unit 22 to the display panel 2 due to a positional deviation between the light receiving unit 22 and the light source 11, the leaked light is caused by the fixing member 12. Can be shielded or diffused. For this reason, it can suppress that a bright spot (a point-like part with high brightness
  • the fixing member 12 is formed using white resin, light can be reflected (light-shielded). Further, if the fixing member 12 is formed using a diffusible resin in which a diffusing material is contained in a transparent resin, light can be emitted to the display panel 2 side in a diffused state.
  • the fixing member 12 it is not necessary to fix the light guide 21 with, for example, an adhesive, and the assembly time of the lighting device 10 can be shortened.
  • the amount of light reaching the tip of the rod-shaped portion 23 is reduced by forming the rod-shaped portion 23 in a tapered shape as the distance from the light receiving portion 22 increases. Thereby, the quantity of the light radiate
  • the light receiving portion 22 is formed with the concave portion 22b that houses at least the light emitting surface of the light source 11 therein.
  • the illuminating device 10 can be made thinner.
  • the light emitted from the light source 11 can also be incident from the inner surface of the recess 22b, the light emitted from the light source 11 can be efficiently incident on the light receiving unit 22.
  • the light guide 21 is continuously arranged so that a plurality of light guides 21 extend in the A direction and is provided integrally. Thereby, the some light guide 21 can be handled as one member (light guide unit 20), and the assembly workability
  • the light emitting surface 23 a of the rod-like portion 23 is formed by a curved surface.
  • the light emitting surface 23a is formed by a lens surface that diffuses and emits light. Thereby, the light emitted from the light emitting surface 23a is diffused (spread) in the B direction as shown in FIG.
  • the remaining structure of the second embodiment is the same as that of the first embodiment.
  • the light emission surface 23a of the rod-shaped portion 23 is formed by a curved surface, so that light is emitted from the light emission surface 23a of the rod-shaped portion 23 in a diffused state.
  • the light emitted from the light emitting surface 23a of the rod-shaped portion 23 is uniformly irradiated (arrived) on the region of the display panel 2 above the rod-shaped portion 23, so that uneven brightness occurs in the display panel 2. It can be suppressed more.
  • the light emission surface 23a of the rod-shaped part 23 is formed flat, as shown in FIG. 16, there may be a portion where the light is insufficiently diffused and the display panel 2 has high luminance. For this reason, it is more effective to form the light emission surface 23a with a curved surface as in this embodiment.
  • the backlight apparatus which illuminates a display panel was demonstrated as an example of an illuminating device, this invention is applicable not only to this but the illuminating device which illuminates to-be-illuminated members other than a display panel. is there.
  • the present invention is not limited to this, and the light source may be configured to obtain light other than white light.
  • the rod-shaped part was provided in the both sides of the A direction of a light-receiving part, and the light-receiving part was formed so that light might be disperse
  • a bar-shaped part may be provided on one side of the light-receiving part, and the light-receiving part may be formed so as to reflect light to one bar-shaped part.
  • the reflecting wall 113 according to the first modification of the present invention shown in FIG. 17 or the reflecting wall 213 according to the second modification of the present invention shown in FIG. 18 may be formed.
  • the reflection surface 113a (second reflection surface) of the reflection wall 113 may be formed of a concave curved surface.
  • the reflection surface 213a (second reflection surface) of the reflection wall 213 may be formed by a step surface. In this case, it is preferable to incline the inclined surface of the reflecting surface 213a at an angle larger than 45 degrees with respect to the perpendicular L2 as in the above embodiment.
  • one mounting substrate may be provided for one light source, or all light sources included in the lighting device may be mounted on one mounting substrate.
  • Display device 2 Display panel (illuminated member) DESCRIPTION OF SYMBOLS 10 Illuminating device 11
  • Light source 12 Fixing member 13, 113, 213 Reflecting wall 13a, 113a, 213a Reflecting surface (2nd reflecting surface) 21
  • Light guide 22 Light-receiving part 22a Back surface 22b Recessed part 22c Upper surface (light-receiving surface) 22d Front surface (first reflective surface) 23 Bar-shaped part 23a Light exit surface (front) 23b Back surface 23c Side wall 23d Processing part (first light emitting processing part) 23e Processing part (second light emitting processing part)
  • E Ellipsoid F1, F2 Focus L1 Long axis L2 Perpendicular

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

La présente invention a trait à un dispositif d'éclairage qui est en mesure de supprimer la luminance irrégulière sur un élément qui est éclairé, de réduire le coût de production et d'avoir un poids réduit et une épaisseur réduite. Ledit dispositif d'éclairage (10) est équipé : de multiples sources lumineuses (11) ; de multiples éléments de guide d'ondes optique (21) qui ont pour fonction de guider la lumière à partir des sources lumineuses et qui sont placés à certains intervalles les uns des autres ; et d'une paroi réfléchissante (13) qui est placée entre chaque élément de guide d'ondes optique. Les éléments de guide d'ondes optique incluent une unité de réception de la lumière (22) qui reçoit la lumière projetée à partir de la source lumineuse, et une unité en forme de tige (23) qui est connectée à l'unité de réception de la lumière. La paroi réfléchissante inclut une surface réfléchissante (13a) qui réfléchit la lumière provenant des éléments de guide d'ondes optique vers un écran d'affichage (2).
PCT/JP2012/057368 2011-03-25 2012-03-22 Dispositif d'éclairage et écran WO2012133118A1 (fr)

Applications Claiming Priority (2)

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JP2011067140 2011-03-25
JP2011-067140 2011-03-25

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WO2012133118A1 true WO2012133118A1 (fr) 2012-10-04

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016045994A (ja) * 2014-08-20 2016-04-04 三菱電機株式会社 面光源装置および液晶表示装置
JP2016045993A (ja) * 2014-08-20 2016-04-04 三菱電機株式会社 面光源装置および液晶表示装置
JP2016045995A (ja) * 2014-08-20 2016-04-04 三菱電機株式会社 面光源装置および液晶表示装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001210122A (ja) * 2000-01-28 2001-08-03 Matsushita Electric Ind Co Ltd 照明装置、映像表示装置、映像表示装置の駆動方法、液晶表示パネル、液晶表示パネルの製造方法、液晶表示パネルの駆動方法、アレイ基板、表示装置、ビューファインダおよびビデオカメラ
JP2004319164A (ja) * 2003-04-14 2004-11-11 Kawaguchiko Seimitsu Co Ltd バックライトユニット
JP2005005275A (ja) * 2004-08-30 2005-01-06 Rohm Co Ltd 線状光源装置、これに用いる導光部材、およびこの導光部材を用いた線状光源を備える画像読み取り装置
WO2006104203A1 (fr) * 2005-03-29 2006-10-05 Fujifilm Corporation Element conducteur de lumiere, illuminateur planaire l’utilisant et illuminateur a barres
JP2009016246A (ja) * 2007-07-06 2009-01-22 Citizen Finetech Miyota Co Ltd 棒状導光体、及びそれを用いた線状光源ならびに面状光源
US20090273946A1 (en) * 2008-02-05 2009-11-05 Hong Kong Applied Science And Technology Research Institute Co., Ltd. Illumination module, and a display and general lighting apparatus using the same
JP2010045029A (ja) * 2008-08-09 2010-02-25 Qinghua Univ 導光板及びバックライトモジュール
JP2010251122A (ja) * 2009-04-15 2010-11-04 Sharp Corp バックライトおよび液晶表示装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001210122A (ja) * 2000-01-28 2001-08-03 Matsushita Electric Ind Co Ltd 照明装置、映像表示装置、映像表示装置の駆動方法、液晶表示パネル、液晶表示パネルの製造方法、液晶表示パネルの駆動方法、アレイ基板、表示装置、ビューファインダおよびビデオカメラ
JP2004319164A (ja) * 2003-04-14 2004-11-11 Kawaguchiko Seimitsu Co Ltd バックライトユニット
JP2005005275A (ja) * 2004-08-30 2005-01-06 Rohm Co Ltd 線状光源装置、これに用いる導光部材、およびこの導光部材を用いた線状光源を備える画像読み取り装置
WO2006104203A1 (fr) * 2005-03-29 2006-10-05 Fujifilm Corporation Element conducteur de lumiere, illuminateur planaire l’utilisant et illuminateur a barres
JP2009016246A (ja) * 2007-07-06 2009-01-22 Citizen Finetech Miyota Co Ltd 棒状導光体、及びそれを用いた線状光源ならびに面状光源
US20090273946A1 (en) * 2008-02-05 2009-11-05 Hong Kong Applied Science And Technology Research Institute Co., Ltd. Illumination module, and a display and general lighting apparatus using the same
JP2010045029A (ja) * 2008-08-09 2010-02-25 Qinghua Univ 導光板及びバックライトモジュール
JP2010251122A (ja) * 2009-04-15 2010-11-04 Sharp Corp バックライトおよび液晶表示装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016045994A (ja) * 2014-08-20 2016-04-04 三菱電機株式会社 面光源装置および液晶表示装置
JP2016045993A (ja) * 2014-08-20 2016-04-04 三菱電機株式会社 面光源装置および液晶表示装置
JP2016045995A (ja) * 2014-08-20 2016-04-04 三菱電機株式会社 面光源装置および液晶表示装置
US10088706B2 (en) 2014-08-20 2018-10-02 Mitsubishi Electric Corporation Surface light source device and liquid crystal display device

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