WO2011158555A1 - 照明装置、表示装置、及びテレビ受信装置 - Google Patents
照明装置、表示装置、及びテレビ受信装置 Download PDFInfo
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- WO2011158555A1 WO2011158555A1 PCT/JP2011/059796 JP2011059796W WO2011158555A1 WO 2011158555 A1 WO2011158555 A1 WO 2011158555A1 JP 2011059796 W JP2011059796 W JP 2011059796W WO 2011158555 A1 WO2011158555 A1 WO 2011158555A1
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- light
- led
- lighting device
- respect
- rising
- 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
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0091—Positioning aspects of the light source relative to the light guide
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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
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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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
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
-
- 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
- G02F1/133608—Direct backlight including particular frames or supporting means
-
- 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
- G02F1/133613—Direct backlight characterized by the sequence of light sources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers
Definitions
- the present invention relates to a lighting device, a display device, and a television receiver.
- a backlight device is separately required as a lighting device.
- the backlight device is installed on the back side of the liquid crystal panel (the side opposite to the display surface).
- the liquid crystal panel side surface is open, a light source accommodated in the chassis, a light source,
- An optical member (such as a diffusion sheet) that is disposed in the opening of the chassis so as to oppose and efficiently emits the light emitted from the light source to the liquid crystal panel side, and the optical member disposed in the chassis so as to oppose the optical member.
- a reflection sheet for reflection on the opening side of the chassis.
- an LED may be used as a light source.
- an LED substrate on which the LED is mounted is accommodated in the chassis.
- what was described in following patent document 1 is known as an example of the backlight apparatus which used LED as a light source.
- the space between adjacent LEDs is widened, so that the region where the LEDs are arranged, and There is a possibility that a difference in brightness and darkness between the area where the LEDs are not arranged becomes large and uneven brightness occurs.
- the present invention has been completed based on the above situation, and an object thereof is to suppress luminance unevenness.
- the illumination device of the present invention includes a light source having a light distribution such that light having a peak emission intensity is directed in a direction inclined with respect to the front direction, and a chassis that houses the light source and opens toward the light emitting side. And a light riser that protrudes toward the light emission side by protruding from the light source installation surface to the light emission side.
- the emission intensity has a peak.
- a light source having a light distribution in which the light with the peak emission intensity is directed in the direction inclined with respect to the front direction is used as the light source accommodated in the chassis, the emission intensity has a peak.
- the emitted light of the light source has a higher utilization efficiency as the emitted light as the angle with respect to the front direction becomes smaller, whereas the utilization efficiency as the emitted light tends to become lower as the angle with respect to the front direction becomes larger.
- the irradiation region of the light having the peak emission intensity tends to become wider, which is more preferable in suppressing luminance unevenness. Therefore, if the angle with respect to the front direction of light at which the light emission intensity reaches a peak is increased in order to suppress luminance unevenness, the light emitted from the light source has the same intensity as the angle with respect to the front direction.
- the efficiency of use as the emitted light may be significantly reduced.
- the brightness tends to be insufficient in the irradiated area of the light, and a dark portion may be generated. There was a possibility that the brightness of the whole incident light was reduced.
- a light riser is provided that projects light toward the light emission side by projecting from the light source installation surface to the light emission side.
- the light raising portion By raising the light having a large angle with respect to the direction by the light raising portion, it is possible to make the light face in the front direction, thereby improving the utilization efficiency as the emitted light.
- the light launching portion improves the utilization efficiency thereof, so that the light irradiation region is unlikely to be a dark portion. As a result, luminance unevenness is less likely to occur, and the luminance of the entire emitted light can be improved.
- the “front direction” referred to here can be defined as, for example, “a normal direction with respect to a light exit surface of the illumination device”.
- the light riser has a light riser surface that is inclined with respect to the front direction and faces the light source. In this way, it is possible to make an angle according to the inclination angle of the light rising surface with respect to the front direction with respect to the light. It is possible to efficiently start up large light and effectively use it as outgoing light. Thereby, it becomes suitable for suppression of luminance unevenness and improvement of luminance.
- the light rising surface is arranged on the side opposite to the light emitting side with respect to the light path so as not to overlap the light path of the light emitted from the light source that has a peak emission intensity. . If it does in this way, among the emitted light of a light source, the light from which light emission intensity becomes a peak will be radiate
- optical path can be defined as, for example, “a locus of light emitted from a light source and traveling without being reflected or refracted by another member”.
- the light rising surface has an angle formed with respect to the front direction that is greater than an angle formed with respect to the front direction by light having a peak emission intensity among the light emitted from the light source.
- the angles formed with respect to the front direction by the light rising surface and the light emitted from the light source having the peak emission intensity are in the range of 45 degrees to 90 degrees, respectively.
- the angle formed with respect to the front direction of the light at which the light emission intensity reaches a peak in the range of 45 to 90 degrees it is possible to secure a wider irradiation region of the light at which the light emission intensity reaches the peak. Therefore, it is more suitable for suppressing luminance unevenness.
- the angle formed by the light rising surface with respect to the front direction in the range of 45 degrees to 90 degrees and larger than the same angle of the light with the peak emission intensity, the light with the peak emission intensity is obtained. As a result, it is possible to effectively improve the use efficiency of the light having the same angle larger than that, which is more suitable for suppressing luminance unevenness and improving luminance.
- the angles formed with respect to the front direction by the light rising surface and the light emitted from the light source that has a peak emission intensity are in the range of 60 degrees to 80 degrees. In this way, in addition to securing a wider light irradiation area where the light emission intensity reaches a peak, it is possible to further improve the efficiency of use of light whose angle is larger than that of light where the light emission intensity reaches a peak. Therefore, it is more preferable to suppress luminance unevenness and improve luminance.
- the light sources are arranged in a state in which a plurality of light sources are arranged in a plane in the chassis, and the light rising portions individually surround the light sources. In this way, since the light from each light source can be raised by the light riser, it is more suitable for suppressing luminance unevenness and improving luminance. In addition, when a plurality of light sources are arranged in a plane in the chassis, the degree of freedom of the arrangement is high.
- the light sources are arranged so that a distance between the adjacent light sources is constant. In this way, the distribution density of the light sources in the chassis can be made uniform, which is more suitable for suppressing luminance unevenness.
- the light sources are arranged in a state where a plurality of light sources are arranged in a plane in the chassis, and each of the light sources can be classified as a light source group. Is configured to individually surround the light source groups. In this way, the number of light rising portions can be reduced, and the cost can be reduced. In addition, it is possible to suppress luminance unevenness and improve luminance by raising light from a light source group composed of a plurality of light sources by a light raising unit.
- the light source groups are arranged such that an interval between the adjacent light source groups is wider than an interval between the light sources included in the light source group. In this way, it is possible to sufficiently secure the size of the light raising portion that is configured to individually surround the light source group. As a result, the light rising function of the light rising portion can be sufficiently exerted, which is more suitable for suppressing luminance unevenness and improving luminance.
- the light sources are arranged in a state in which a plurality of the light sources are arranged along one side of the chassis and the other side orthogonal to the one side in the chassis, and along the one side and the other side.
- the light source group is configured by a plurality of the light sources arranged in parallel. In this way, the light from each light source that is paralleled along one side and the other side perpendicular to the one side can be efficiently launched toward the light exit side by the light launching unit. This is suitable for suppressing luminance unevenness and improving luminance.
- a plurality of the light sources are arranged linearly in parallel along one side of the chassis, and the light source group is configured by the plurality of light sources linearly arranged in parallel.
- the riser is configured to extend along a parallel direction of the light sources forming the light source group. In this way, the light from each of the light sources arranged in parallel along one side of the chassis is efficiently directed toward the light emitting side by the light rising portion extending in the parallel direction of the light sources forming the light source group. Therefore, it is suitable for suppressing luminance unevenness and improving luminance.
- the light rising portion has a circular cross-sectional shape in the circumferential direction. In this way, since it can be launched toward the light emitting side without giving a specific directivity to the light radially spreading from the light source, it is extremely excellent in suppressing luminance unevenness.
- the light rising portion has a square cross-sectional shape in the circumferential direction. If it does in this way, it is excellent in the viewpoint of the shape stability of a light raising part, for example.
- the light rising surface is configured by an inclined surface in a cross-sectional shape cut along the front direction.
- the light rising surface having a cross-sectional shape cut along the front direction as an inclined surface can be appropriately angled with respect to light, thereby suppressing luminance unevenness and improving luminance. Preferred above.
- the light rising surface is configured by a curved surface having an arcuate cross section cut along the front direction.
- the light rising surface whose cross-sectional shape cut along the front direction is an arcuate curved surface can be appropriately angled with respect to light, thereby suppressing luminance unevenness and improving luminance. This is suitable for the purpose.
- the light rising portion protrudes more toward the light emitting side than the light source. In this way, more light from the light source can be raised toward the light exit side by the light riser than when the light riser has a projection size equivalent to that of the light source. This is more suitable for suppressing unevenness and improving luminance.
- a reflecting member is provided so as to cover the light emitting side surface of the chassis, and the light rising portion is integrally formed with the reflecting member. In this way, the light in the chassis is reflected by the reflecting member, so that the light can be launched more efficiently toward the light emitting side.
- the light rising portion is formed integrally with the reflecting member, for example, it is advantageous in arranging a plurality of light rising portions in the chassis.
- the reflection member is made of a thermoplastic resin material.
- the light rising portion can be easily formed by a technique such as vacuum forming, and the shape stability of the light rising portion is excellent.
- it is effective when a plurality of light rising portions are formed on the reflecting member or when the shape of the light rising portions is complicated.
- the reflecting member has a white surface. In this way, a high light reflectivity can be obtained, so that light can be launched more efficiently toward the light exit side, which is more suitable for suppressing luminance unevenness and improving luminance.
- the light source has a light distribution such that light having a peak emission intensity is emitted in a radial shape while being point-shaped. In this way, the light irradiation region where the light emission intensity reaches a peak among the light emitted from the light source having a dot shape is formed in an annular shape, which is more preferable for suppressing luminance unevenness.
- the light source includes a light emitting unit that emits light, and a lens unit that is opposed to the light emitting surface of the light emitting unit and emits light while diffusing the light from the light emitting unit.
- the light distribution is such that the light with the peak emission intensity is directed in a direction inclined with respect to the front direction. Can be designed easily.
- a concave portion is formed on a surface of the lens portion on the light emitting side. In this way, since the light from the light emitting part can be appropriately refracted and diffused according to the shape of the concave part, the optical design in the lens part becomes easy.
- the lens unit is provided integrally with the light emitting unit. In this way, since the lens part and the light emitting part constituting the light source are made into one part, the number of parts is reduced compared with the case where the lens part is made separate from the light emitting part, and the manufacture relating to the light source is made. Cost can be reduced.
- the lens unit is a separate component from the light emitting unit. If it does in this way, the thing of the structure which does not have a lens part integrally as a light emission part can be used.
- the light emitting unit includes an LED element. In this way, high brightness and low power consumption can be achieved.
- a plurality of the light sources are mounted and a light source board disposed in the chassis is provided. In this way, by disposing the light source substrate in the chassis, a plurality of light sources can be collectively disposed in the chassis, so that the assembly workability is excellent.
- a display device of the present invention includes the above-described illumination device and a display panel that performs display using light from the illumination device.
- the illumination device that supplies light to the display panel can suppress luminance unevenness, it is possible to realize display with excellent display quality.
- a liquid crystal panel can be exemplified as the display panel.
- Such a display device can be applied as a liquid crystal display device to various uses such as a display of a television or a personal computer, and is particularly suitable for a large screen.
- FIG. 1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention.
- the exploded perspective view which shows schematic structure of the liquid crystal display device with which a television receiver is equipped
- the top view which shows the arrangement structure of the LED board in a chassis with which a liquid crystal display device is equipped, and a reflective sheet Sectional drawing which shows the cross-sectional structure along the short side direction of a liquid crystal display device Sectional drawing which shows the cross-sectional structure along the long side direction of a liquid crystal display device
- the principal part expanded sectional view which shows the cross-sectional structure of the light rising part of LED and a reflective sheet Graph showing light distribution in LED
- the principal part enlarged plan view which shows the arrangement
- the principal part expanded sectional view which shows the cross-sectional structure of LED group and a light raising part The principal part enlarged plan view which shows the arrangement structure of the LED group which concerns on the modification 2 of Embodiment 1, and a light raising part.
- the principal part expanded sectional view which shows the cross-sectional structure of LED group and a light raising part The principal part enlarged plan view which shows arrangement structure of LED which concerns on the modification 3 of Embodiment 1, and a light raising part
- the principal part expanded sectional view which shows the cross-sectional structure of LED which concerns on the modification 4 of Embodiment 1, and the light riser part The principal part expanded sectional view which shows the cross-sectional structure of LED which concerns on the modification 5 of Embodiment 1, and a light riser part
- the principal part expanded sectional view which shows the cross-sectional structure of LED which concerns on the modification 6 of Embodiment 1, and a light riser part The principal part expanded sectional view which shows sectional structure of LED which concerns on the modification 7 of Embodiment 1, and
- Main part enlarged plan view showing arrangement configuration of LED and light rising part The principal part enlarged plan view which shows the arrangement structure of the LED group which concerns on the modification 1 of Embodiment 2, and a light raising part.
- the principal part enlarged plan view which shows the arrangement configuration of the LED group which concerns on the modification 2 of Embodiment 2, and a light raising part.
- the principal part enlarged plan view which shows arrangement structure of LED which concerns on the modification 3 of Embodiment 2, and a light raising part
- the top view which shows the arrangement configuration of the light starting part of LED and a reflective sheet in the chassis which concerns on Embodiment 3 of this invention.
- Sectional drawing which shows the cross-sectional structure along the short side direction of a liquid crystal display device
- Sectional drawing which shows the cross-sectional structure along the long side direction of a liquid crystal display device
- the principal part expanded sectional view which shows the cross-sectional structure of the light source and light starting part which concerns on Embodiment 4 of this invention.
- the principal part expanded sectional view which shows sectional structure of LED which concerns on Embodiment 5 of this invention, and a light riser part
- the top view which shows the arrangement configuration of LED and the light raising part of a reflection sheet in the chassis which concerns on other embodiment (1) of this invention.
- FIGS. 1 A first embodiment of the present invention will be described with reference to FIGS.
- the liquid crystal display device 10 is illustrated.
- a part of each drawing shows an X axis, a Y axis, and a Z axis, and each axis direction is drawn to be a direction shown in each drawing.
- the upper side shown in FIG.4 and FIG.5 be a front side, and let the lower side of the figure be a back side.
- the television receiver TV includes a liquid crystal display device 10, front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, a power source P, a tuner T, And a stand S.
- the liquid crystal display device (display device) 10 has a horizontally long (longitudinal) rectangular shape (rectangular shape) as a whole and is accommodated in a vertically placed state.
- the liquid crystal display device 10 includes a liquid crystal panel 11 that is a display panel and a backlight device (illumination device) 12 that is an external light source, which are integrated by a frame-like bezel 13 or the like. Is supposed to be retained.
- the liquid crystal panel 11 and the backlight device 12 constituting the liquid crystal display device 10 will be described sequentially.
- the liquid crystal panel (display panel) 11 has a horizontally long rectangular shape when seen in a plan view, and a pair of glass substrates are bonded together with a predetermined gap therebetween, and a liquid crystal is formed between both glass substrates. It is set as the enclosed structure.
- One glass substrate is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like.
- a switching element for example, TFT
- the substrate is provided with a color filter and counter electrodes in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement, and an alignment film.
- a polarizing plate is disposed on the outside of both substrates.
- the backlight device 12 is arranged so as to cover the chassis 14 having a substantially box shape having an opening 14 b on the light emitting side (the liquid crystal panel 11 side), and the opening 14 b of the chassis 14.
- a frame 16 that holds the outer edge of the group between the chassis 14 and the frame 16.
- an LED (Light Emitting Diode) 17 having a lens unit 21 integrally as a light source, an LED board 18 on which the LED 17 is mounted, and the light in the chassis 14 to the optical member 15 side.
- a reflection sheet 19 for reflection is provided.
- the backlight device 12 according to the present embodiment is a so-called direct type in which the optical member 15 is arranged opposite to the LED 17 on the light emission side (front side). Below, each component of the backlight apparatus 12 is demonstrated in detail.
- the chassis 14 is made of metal. As shown in FIGS. 3 to 5, the chassis 14 has a horizontally long bottom (rectangular, rectangular) as in the liquid crystal panel 11, and each side (a pair of bottom plates 14a). It consists of a side plate 14c rising from the outer end of the long side and a pair of short sides toward the front side (light emitting side), and a receiving plate 14d projecting outward from the rising end of each side plate 14c. It has a shallow box shape (substantially a shallow dish) that opens toward the top.
- the long side direction of the chassis 14 coincides with the X-axis direction (horizontal direction), and the short side direction coincides with the Y-axis direction (vertical direction).
- the bottom plate 14 a in the chassis 14 is disposed on the back side of the LED substrate 18, that is, on the side opposite to the light emitting side of the LED 17.
- a frame 16 and an optical member 15 to be described below can be placed on each receiving plate 14d in the chassis 14 from the front side.
- a frame 16 is screwed to each receiving plate 14d.
- the optical member 15 has a horizontally long rectangular shape when seen in a plan view like the liquid crystal panel 11 and the chassis 14, and its main plate surface is along the X-axis direction and the Y-axis direction (the chassis 14 In parallel with the bottom plate 14a) and perpendicular to the Z-axis direction.
- the optical member 15 has its outer edge portion placed on the receiving plate 14 d so as to cover the opening 14 b of the chassis 14 and be interposed between the liquid crystal panel 11 and the LED 17. Arranged.
- the optical member 15 is opposed to the LED 17 with a predetermined interval on the front side, that is, on the light emitting side.
- the optical member 15 can emit light emitted from the LED 17 disposed on the back side to the outside of the front side while giving a predetermined optical action, and the main plate surface of the optical member 15 is the main plate surface. It can be said that the light emission surface of the entire backlight device 12 according to the embodiment is configured.
- the optical member 15 includes a diffusion plate 15a disposed on the back side (the LED 17 side, opposite to the light emitting side) and an optical sheet 15b disposed on the front side (the liquid crystal panel 11 side, the light emitting side). Composed.
- the diffusing plate 15a has a structure in which a large number of diffusing particles are dispersed in a substantially transparent resin base material having a predetermined thickness, and has a function of diffusing transmitted light.
- the optical sheet 15b has a sheet shape that is thinner than the diffusion plate 15a, and two optical sheets 15b are laminated.
- Specific types of the optical sheet 15b include, for example, a diffusion sheet, a lens sheet, a reflective polarizing sheet, and the like, which can be appropriately selected and used.
- the frame 16 has a frame shape along the outer peripheral edge portions of the liquid crystal panel 11 and the optical member 15. An outer edge portion of the optical member 15 can be sandwiched between the frame 16 and each receiving plate 14d (FIGS. 4 and 5).
- the frame 16 can receive the outer edge portion of the liquid crystal panel 11 from the back side, and can sandwich the outer edge portion of the liquid crystal panel 11 with the bezel 13 disposed on the front side (FIGS. 4 and 5). ).
- the LED 17 is a so-called point light source that forms a dot shape in the plane of the light emission surface of the entire backlight device 12.
- the LED 17 is mounted on the front surface of the LED substrate 18, and the surface opposite to the mounting surface with respect to the LED substrate 18 (the surface facing the optical member 15) is the light emitting surface.
- the detailed configuration of the LED 17 will be described in detail later.
- the LED substrate 18 has a horizontally long rectangular shape (rectangular shape, rectangular shape) like the bottom plate 14a of the chassis 14, and the long side direction coincides with the X-axis direction.
- the chassis 14 is accommodated while extending along the bottom plate 14a.
- the LED board 18 has a flat plate shape along the bottom plate 14a and is disposed so as to overlap the front side of the bottom plate 14a.
- the LED substrate 18 is large enough to cover the entire area of the bottom plate 14a, specifically, an outer peripheral end portion of the bottom plate 14a. It has a size that can cover most of the center side excluding.
- the LED 17 having the above-described configuration is surface-mounted on a surface facing the front side (a surface on the light emitting side, a surface facing the optical member 15 side). It is a mounting surface (installation surface) 18a.
- the LEDs 17 are two or more planar in the LED board 18 in the X-axis direction (the longer side direction of the chassis 14 and the LED board 18) and the Y-axis direction (the shorter side direction of the chassis 14 and the LED board 18). Are arranged in parallel (two-dimensionally).
- a plurality of LEDs 18 are arranged in a matrix (arranged in a matrix) with the X-axis direction as the row direction and the Y-axis direction as the column direction on the LED substrate 18. Specifically, nine LEDs 17 in the X-axis direction and five LEDs 17 in the Y-axis direction are arranged in parallel on the LED substrate 18. A large number of LEDs 17 are connected to each other by a wiring pattern (not shown) formed on the LED substrate 18. The arrangement pitch (interval between adjacent LEDs 17) of the LEDs 17 arranged in parallel along the X-axis direction is constant. Similarly, the arrangement pitch of the LEDs 17 arranged in parallel along the Y-axis direction is constant.
- the arrangement pitch in the X-axis direction and the arrangement pitch in the Y-axis direction are substantially equal.
- the LEDs 17 are arranged on the LED substrate 18 at substantially equal intervals in the X-axis direction and the Y-axis direction.
- the reflection sheet 19 is made of a synthetic resin material having thermoplasticity, and has a white surface with excellent light reflectivity. As shown in FIGS. 3 to 5, the reflection sheet 19 has a size that is laid over almost the entire inner surface (surface on the light emission side) of the chassis 14. It is possible to cover the substrate 18 from the front side (light emission side, optical member 15 side) over almost the entire area. The reflection sheet 19 can reflect the light in the chassis 14 toward the front side (light emission side, optical member 15 side). The reflection sheet 19 extends along the LED board 18 (bottom plate 14 a) and covers a substantially entire area of the LED board 18, and rises from the outer ends of the bottom part 19 a to the front side and the bottom plate 14 a of the chassis 14.
- the four rising portions 19b are inclined to each other, and the extending portion 19c extends outward from the outer end of each rising portion 19b and is placed on the receiving plate 14d of the chassis 14.
- the bottom portion 19 a of the reflection sheet 19 is disposed so as to overlap the front side of the LED substrate 18, that is, the mounting surface of the LED 17.
- a light source insertion hole 19 d through which each LED 17 is individually inserted is provided in the bottom portion 19 a of the reflection sheet 19 at a position overlapping with each LED 17 in plan view.
- a plurality of light source insertion holes 19d are arranged in parallel in a matrix (matrix shape) in the X-axis direction and the Y-axis direction corresponding to the arrangement of the LEDs 17.
- the LED 17 has an LED chip as a light emitting source and emits light, and is opposed to the light emitting surface 20 a of the light emitting unit 20 and diffuses light from the light emitting unit 20.
- the lens unit 21 that emits light while being integrated is integrated.
- the light emitting unit 20 is configured such that the LED chip is sealed with a resin material (both the substrate unit and the LED chip are not shown) on the substrate unit fixed to the LED substrate 18.
- the LED chip mounted on the substrate unit has one main emission wavelength, and specifically, one that emits blue light in a single color is used.
- the resin material for sealing the LED chip is dispersed and blended with a phosphor for converting blue light emitted from the LED chip into substantially white light. As a result, the LED 17 can emit substantially white light.
- the lens portion 21 is made of a synthetic resin material (for example, polycarbonate, acrylic, etc.) that is almost transparent (having high translucency) and has a refractive index higher than that of air.
- the lens unit 21 is integrated with the light emitting unit 20 by being mounted on the light emitting surface 20 a of the light emitting unit 20.
- the lens unit 21 has a light emitting surface 21a that is flat and substantially hemispherical (dome-shaped) and emits light. With this light emitting surface 21a, the light from the light emitting unit 20 can be emitted while being diffused in the radiation direction with the center of the LED 17 as a reference. Furthermore, a concave portion 21b is formed on the light emitting surface 21a.
- the concave portion 21a is disposed substantially at the center position in the lens portion 21, and can refract light at a wider angle and diffuse and emit the light in the radial direction. As described above, the light emitted from the light emitting unit 20 is emitted through the lens unit 21 while diffusing in the radiation direction with the center of the LED 17 as a reference, so that directivity is relaxed.
- a specific optical design of the lens unit 21 will be described.
- the relationship between the emission angle and the light emission intensity of the light emitted from the lens unit 21 (the light emitted from the LED 17), that is, the light distribution (light distribution characteristic) of the LED 17 according to this embodiment is as shown in FIG.
- the horizontal axis is an angle with respect to the front direction (unit is “degree”)
- the vertical axis is emission intensity (arbitrary unit).
- the above-mentioned “front direction” is directed to the front side, for example, through the center of the LED 17 and along the Z-axis direction, that is, the direction orthogonal to the main plate surface of the optical member 15 (light emission surface of the entire backlight device 12). It can be defined as a direction.
- the LED 17 does not have an angle ⁇ 1 ( ⁇ 1) of 0 ° with respect to the front direction of the light with the highest emission intensity, that is, the light with the peak emission intensity. It has a light distribution that goes in a direction inclined with respect to the front direction. Specifically, the LED 17 has the lowest light emission intensity toward the front direction (the direction in which the angle shown in FIG.
- the light distribution of the LED 17 is designed to have a substantially symmetrical shape except for the influence of manufacturing errors and the like. More specifically, from the angle of 0 degrees with respect to the front direction to the angle ⁇ 1 ( ⁇ 1) at which the emission intensity reaches a peak, the change in emission intensity is relatively gradual, whereas the angle ⁇ 1 at which the emission intensity reaches a peak. From exceeding ( ⁇ 1) to 90 degrees ( ⁇ 90 degrees), the change in emission intensity is relatively steep.
- the light with the peak emission intensity is emitted radially from the center of the LED 17 and travels in a direction having a predetermined angle ⁇ 1 ( ⁇ 1) with respect to the front direction.
- the irradiation area A of the optical member 15 by the light whose emission intensity reaches a peak has a donut shape (annular shape) having a predetermined width as shown in FIG.
- the irradiation area A is shown as a range surrounded by two circular two-dot chain lines and shaded.
- the irradiation area A is reduced toward the arrow Sh direction, that is, toward the center as the absolute value of the angle ⁇ 1 ( ⁇ 1) with respect to the front direction of the light whose emission intensity reaches a peak decreases.
- the absolute value of the same angle ⁇ 1 ( ⁇ 1) is increased, it tends to be enlarged in the direction of the arrow line Ex in FIG.
- the “absolute value of the angle” is used as a reference for the magnitude of the angle. That is, as the angle ⁇ 1 ( ⁇ 1) formed by the light having the peak emission intensity with respect to the front direction is increased, the irradiation area A by the peak light is expanded and the area thereof is increased.
- the absolute value of the angle ⁇ 1 ( ⁇ 1) formed by the light with the peak emission intensity with respect to the front direction is in the range of 45 to 90 degrees, more preferably in the range of 60 to 80 degrees. Further, as shown in FIG. 8, it is most preferable that the angle is about 70 degrees.
- the light emitted from the LED 17 and applied to the optical member 15 is perpendicular to the main plate surface of the optical member 15 as the angle with respect to the front direction (normal direction to the main plate surface of the optical member 15) decreases. Since the incident light is incident at a deep angle close to, the utilization efficiency as the emitted light based on the amount of light traveling in the front direction is increased, which contributes to the improvement of the luminance. On the other hand, as the angle increases, the optical member 15 increases. Since the light is incident at a shallow angle close to 0 degrees with respect to the main plate surface, the utilization efficiency as emitted light tends to be lowered, leading to a decrease in luminance.
- the absolute value of the angle ⁇ 1 ( ⁇ 1) formed by the light having the peak emission intensity in the emitted light of the LED 17 with respect to the front direction is set to a considerably large value, for example, about 70 degrees.
- the angle is extremely shallow with respect to the main plate surface of the optical member 15.
- the incident light is incident at an angle (for example, an angle whose absolute value is less than 20 degrees), and there is a concern that the utilization efficiency as the emitted light is significantly reduced.
- the emission region and the emission intensity have a peak.
- the difference between brightness and darkness increases with the irradiation area A by the light (area A where the luminance is maximum in the irradiation area of the optical member 15 by the LED 17), and this is viewed as luminance unevenness.
- the reflection sheet 19 is provided with a light raising portion 22 that raises the light to be directed toward the front side.
- the light rising portion 22 is integrally formed with the reflection sheet 19, and is provided on the bottom portion 19 a having the same size as the bottom plate 14 a of the chassis 14 in the reflection sheet 19.
- the reflection sheet 19 is vacuum-formed, and the bottom portion 19a of the reflection sheet 19 is bent into a predetermined shape, so that the light rising portion 22 is integrally formed.
- the light riser 22 is provided for each LED 17 arranged in parallel on the LED substrate 18, and surrounds each LED 17 individually, that is, in a ring shape when viewed in plan. There is no.
- a plurality of light rising portions 22 are arranged in parallel in a matrix in a matrix form corresponding to the arrangement of the LEDs 17 at the bottom portion 19a.
- the light rising portion 22 protrudes toward the front side from the installation surface 18 a of the LED 17, that is, the mounting surface 18 a of the LED 17 on the LED substrate 18, and further protrudes to the front side from the LED 17.
- the light launching portion 22 is a large portion of the bottom portion 19 a excluding a portion having a hole edge of each light source insertion hole 19 d (supported portion 23 described later). It is formed by projecting toward the front side, and the remaining part of the bottom part 19 a is a supported part 23 that is received by the LED substrate 18.
- the light rising portion 22 has a protruding proximal end portion (rising proximal end portion, bending point) at the outer end position of the supported portion 23.
- a plurality of light rising portions 22 are arranged in parallel along the mounting surface 18a of the LED substrate 18 in a matrix (FIG. 3), and each light rising portion 22 is adjacent to each other in the X axis direction and the Y axis direction.
- the protruding tip portions (rising tip portions) of the raised portion 22 are connected to each other. Specifically, the projecting tip portions of each light rising portion 22 are connected to each other via a flat portion 24 parallel to the mounting surface 18 a of the LED substrate 18.
- the light rising portion 22 has a protruding dimension such that a predetermined gap C is held between the protruding tip portion and the optical member 15, and the specific protruding dimension is the bottom portion 19 a of the reflection sheet 19 and the optical portion.
- the distance between the member 15 and the member 15 is about 1/3 to 1/2. Therefore, the light rising portion 22 is in a non-contact state with respect to the diffusion plate 15a disposed on the back side of the optical member 15, and even if the diffusion plate 15a is slightly bent and deformed on the back side, the non-contact state. Is to be maintained.
- each light rising part 22 located in the outermost periphery end in the bottom part 19a is continuously connected without a level
- each light rising portion 22 has a bowl shape (inverted conical shape) as a whole so as to surround the LED 17 disposed on the center side in a plan view.
- the LED 17 is concentrically arranged.
- 7 shows a cross-sectional shape of the LED 17 and the light riser 22 cut along the Z-axis direction and the X-axis direction. This drawing intersects the Z-axis direction and the Z-axis direction.
- disconnected along the arbitrary directions (for example, the direction which cross
- the light rising portion 22 has a cross-sectional shape cut along a direction (surface along the X-axis direction and the Y-axis direction) orthogonal to the front direction (Z-axis direction), that is, the cross-sectional shape in the circumferential direction is circular. (Fig. 6).
- disconnected along the front direction (Z-axis direction) has comprised inclined form (FIG. 7).
- the inner peripheral surface in the light raising part 22 inclines with respect to the front direction (Z-axis direction) so that it may face LED17 distribute
- the light rising surface 22a is raised toward the front side.
- the light rising surface 22a is an arcuate curved surface in the circumferential direction.
- the light rising surface 22a has a constant gradient from the projecting proximal position to the projecting distal position, as the cross-sectional shape cut along the Z-axis direction that is the front direction and an arbitrary direction that intersects the Z-axis direction. It becomes the inclined surface which has.
- the light rising surface 22a is behind the light path, that is, the light emission so as not to overlap the light path (arrow line shown in FIG. 7) of the light emitted from the LED 17 having the peak light emission intensity. Retracted (withdrawn) from the side opposite the side.
- the light rising surface 22a has an absolute value of an angle ⁇ 2 ( ⁇ 2) formed with respect to the front direction, and an angle ⁇ 1 formed by light having a peak emission intensity of the light emitted from the LED 17 with respect to the front direction. It is assumed to be larger than the absolute value of ( ⁇ 1).
- the angle ⁇ 2 ( ⁇ 2) formed by the light raising portion 22 with respect to the front direction is illustrated, and in addition, the light emission direction in which the light emission intensity reaches a peak among the light emitted from the LED 17 is illustrated. Is indicated by an arrow line and an angle ⁇ 1 ( ⁇ 1) with respect to the front direction is illustrated. Accordingly, the light rising surface 22a has light that has an angle that exceeds the angle ⁇ 1 ( ⁇ 1) that the light emitted from the LED 17 has a peak emission intensity with respect to the front direction (the graph shown in FIG. 8). In this case, light that is 90 degrees ( ⁇ 90 degrees) more than ⁇ 1 ( ⁇ 1) in FIG.
- the angle ⁇ 2 ( ⁇ 2) is set to have an absolute value larger than the angle ⁇ 1 ( ⁇ 1), the light rising surface is compared with the case where the magnitude relation between these angles is reversed. Since the area of 22a can be secured relatively large and the light rising surface 22a can raise the light at a wider angle, it is more useful in suppressing luminance unevenness.
- the absolute value of the angle ⁇ 2 ( ⁇ 2) formed by the light rising portion 22 (light rising surface 22a) with respect to the front direction is in the range of 45 degrees to 90 degrees, more preferably 60 degrees to 80 degrees.
- the angle ⁇ 1 ( ⁇ 1) is larger than the absolute value, and more specifically, an angle slightly larger than 70 degrees is most preferable.
- the gap C held between the rising portion 22 and the diffusion plate 15a light from the LED 17 surrounded by the light rising portion 22 and light from each LED 17 arranged adjacent to the LED 17 are provided. Are allowed to go to and from each other.
- This embodiment has the structure as described above, and its operation will be described next.
- the light emitted from each LED 17 is directly applied to the optical member 15 as shown in FIGS. After being reflected by the reflection sheet 19 or the like, it enters indirectly, passes through the optical member 15, and then exits toward the liquid crystal panel 11.
- the light emitted from the light emitting surface 20a of the light emitting unit 20 in the LED 17 enters the lens unit 21 and is emitted from the light emitting surface 21a as shown in FIG. Since the light emission surface 21a is substantially hemispherical and has a recess 21b at the center thereof, the light is refracted at a wide angle and emitted while diffusing radially.
- the light distribution of the LED 17 is as shown in FIG. 8, and light having an absolute value of an angle of about 70 degrees with respect to the front direction has a peak emission intensity.
- the light launching portion 22a has an angle ⁇ 2 ( ⁇ 2) formed with respect to the front direction larger in absolute value than an angle ⁇ 1 ( ⁇ 1) formed with respect to the front direction with light having a peak emission intensity. It is set to become. For this reason, the light having the peak emission intensity is incident on the diffusion plate 15a while radiating as it is without hitting the light rising portion 22. Therefore, it is possible to secure a wide irradiation area A of the optical member 15 with the light having the peak emission intensity as compared with the case where the light having the peak emission intensity is set to the front side by the light rising portion. it can.
- the absolute value of the angle ⁇ 1 ( ⁇ 1) formed by the light with the peak emission intensity with respect to the front direction is about 70 degrees exceeding 45 degrees and 60 degrees.
- the irradiation area A can be secured sufficiently wide, so that the in-plane distribution of luminance in the emitted light of the optical member 15 is less likely to be uneven.
- the light reflected by the light rising surface 22a is directly irradiated to the diffusion plate 15a without hitting the light rising portion 22 with light having an angle larger than the angle ⁇ 1 ( ⁇ 1) formed with respect to the front direction.
- the angle with respect to the front direction is relatively small, and the light is incident at a deep angle close to perpendicular to the main plate surface of the diffusion plate 15a. Since the luminance of the light emitted from the optical member 15 is calculated with reference to the amount of light traveling in the front direction, the angle ⁇ 1 ( ⁇ 1) formed by the light launching unit 22 with respect to the front direction among the light emitted from the LED 17. ) Can be effectively used as the emitted light, thereby contributing to an improvement in the brightness of the entire emitted light.
- the light riser 22 raises light in the front direction that is larger than the angle ⁇ 1 ( ⁇ 1) of the light emitted from the LED 17 with respect to the front direction, so that the optical member 15 is irradiated by the light.
- the difference in brightness (brightness difference) that may occur between the region and the irradiation region A of the optical member 15 due to the light having the peak emission intensity can be reduced, and thus the in-plane distribution of the brightness of the emitted light can be further increased. It can be made uniform, and is more suitable for suppressing luminance unevenness.
- the light launching portions 22 are arranged so as to individually surround the plurality of LEDs 17 arranged in parallel in a plane, the light emitting portions of the individual LEDs 17 are raised by the dedicated light launching portions 22 respectively. Therefore, it is more suitable for suppressing luminance unevenness and improving luminance.
- the light riser 22 surrounds each LED 17 individually, the distance from the center of the LED 17 to the outer end of the light riser 22 is all constant, thereby The arrangement pitch of the LEDs 17 in the X-axis direction and the Y-axis direction can be made constant (same). As a result, the distribution density of the LEDs 17 in the chassis 14 becomes uniform, which is useful for suppressing luminance unevenness.
- the light from the LEDs 17 arranged adjacent to each other can go to and from each other.
- the light rising part 22 becomes difficult to visually recognize as a dark part, and is suitable for suppression of a brightness nonuniformity also in this point.
- the luminance unevenness of the emitted light in the backlight device 12 can be suppressed, the following effects can be obtained.
- the distance between the LED 17 and the optical member 15 in the Z-axis direction is reduced, the light from the LED 17 is incident on the optical member 15 without spreading. Since the luminance unevenness can be suppressed by the light riser 22 according to the embodiment, the distance in the Z-axis direction between the LED 17 and the optical member 15 can be further reduced, and thus the backlight device 12 and the liquid crystal display device 10 can be reduced. Can be made thinner.
- the number of LEDs 17 when the number of LEDs 17 is reduced, bright portions and dark portions are likely to be generated in the in-plane distribution in the luminance of emitted light, but luminance unevenness is caused by the light rising portion 22 according to the present embodiment. Since the number of LEDs 17 can be reduced, the power consumption and manufacturing cost of the backlight device 12 and the liquid crystal display device 10 can be reduced.
- the backlight device 12 accommodates the LED 17 that is a light source having a light distribution such that light having a peak emission intensity is directed in a direction inclined with respect to the front direction, and the LED 17.
- a chassis 14 that opens toward the light emission side, and a light riser 22 that raises light toward the light emission side by protruding from the installation surface of the LED 17 to the light emission side are provided.
- the emission intensity has the peak.
- the emission efficiency of the LED 17 tends to be lower as the angle with respect to the front direction becomes smaller, and the utilization efficiency as the emitted light becomes higher, whereas as the angle with respect to the front direction becomes larger, the utilization efficiency as the emitted light tends to decrease.
- the irradiation area A of the light at which the light emission intensity reaches a peak tends to become wider, which is more suitable for suppressing luminance unevenness.
- the light intensity of the light emitted from the LED 17 is the same as the angle formed with respect to the front direction.
- the efficiency of use as the emitted light may be significantly reduced. In such a case, the brightness tends to be insufficient in the irradiated area of the light, and a dark portion may be generated. There was a possibility that the brightness of the whole incident light was reduced.
- the light rising portion 22 is provided that protrudes toward the light emitting side by projecting from the installation surface of the LED 17 to the light emitting side.
- the light rising portion 22 raises light having a large angle with respect to the front direction, so that the light can be directed to the front direction, and the utilization efficiency as emitted light can be improved.
- the light launching unit 22 improves the utilization efficiency thereof, so that the light irradiation region becomes a dark part. As a result, it becomes difficult to cause uneven brightness, and the brightness of the entire emitted light can be improved.
- the backlight device 12 can be thinned. For example, the number of LEDs 17 can be reduced. Therefore, it is possible to reduce power consumption and manufacturing cost of the backlight device 12.
- the “front direction” referred to here can be defined as, for example, “the normal direction with respect to the light emitting surface of the backlight device 12”.
- the light launching portion 22 has a light launching surface 22a that is inclined with respect to the front direction and that faces the LED 17. If it does in this way, since the angle according to the inclination angle which the light rising surface 22a makes with respect to the front direction with respect to light can be given, the angle made with respect to the front direction among the emitted light of LED17. However, it is possible to efficiently start up large light and effectively use it as outgoing light. Thereby, it becomes suitable for suppression of luminance unevenness and improvement of luminance.
- the light rising surface 22a is arranged on the side opposite to the light emitting side with respect to the light path so as not to overlap with the light path of the light emitted from the LED 17 having the peak emission intensity. If it does in this way, about the light emission intensity
- the irradiation area by the light having the peak emission intensity becomes narrow, which may promote luminance unevenness. In this respect, according to the present embodiment, such a problem does not occur, and the irradiation area A by light having a peak emission intensity can be secured sufficiently wide.
- the “optical path” mentioned here can be defined as, for example, “the locus of light emitted from the LED 17 and traveling without being reflected or refracted by another member (for example, the optical member 15 or the like)”.
- the angle of the light rising surface 22a formed with respect to the front direction is larger than the angle formed with respect to the front direction of light emitted from the LED 17 having a peak emission intensity.
- the light rising surface 22a is compared with the case where the angle formed by the light rising surface with respect to the front direction is smaller than the angle formed by the light having the peak emission intensity with respect to the front direction.
- the light can be raised to a wider angle, which is more useful for suppressing luminance unevenness.
- the angles formed by the light rising surface 22a and the light emitted from the LED 17 having the peak emission intensity with respect to the front direction are in the range of 45 to 90 degrees, respectively.
- the light emission surface 22a has an emission intensity peak by making the angle formed by the light rising surface 22a with respect to the front direction in a range of 45 to 90 degrees and larger than the same angle of light at which the emission intensity reaches a peak. Since it is possible to effectively improve the use efficiency of light having the same angle larger than that of light, it is more suitable for suppressing luminance unevenness and improving luminance.
- angles formed by the light rising surface 22a and the light emitted from the LED 17 having the peak emission intensity with respect to the front direction are in the range of 60 degrees to 80 degrees, respectively.
- the light irradiation area A where the light emission intensity reaches a peak can be ensured more widely, and in addition, the use efficiency of the light having the same angle larger than the light where the light emission intensity reaches a peak can be increased. Since it can improve effectively, it becomes more suitable by suppression of brightness nonuniformity and improvement of brightness.
- the LEDs 17 are arranged in a state in which a plurality of LEDs 17 are arranged in a plane in the chassis 14, and the light launching portion 22 is configured to individually surround the LEDs 17. In this way, since the light from each LED 17 can be raised by the light raising portion 22, it is more suitable for suppressing luminance unevenness and improving luminance. In addition, when the plurality of LEDs 17 are arranged in a plane in the chassis 14, the degree of freedom in the arrangement is high.
- the LEDs 17 are arranged so that the distance between the adjacent LEDs 17 is constant. In this way, the distribution density of the LEDs 17 in the chassis 14 can be made uniform, which is more suitable for suppressing luminance unevenness.
- the light rising portion 22 has a circular cross-sectional shape in the circumferential direction. In this way, the light that radiates from the LED 17 can be raised toward the light emitting side without giving a specific directivity, which is extremely excellent in suppressing luminance unevenness.
- the light rising surface 22a is configured by an inclined surface having a cross-sectional shape cut along the front direction.
- the light rising surface 22a in which the cross-sectional shape cut along the front direction is an inclined surface makes it possible to appropriately angle the light, thereby suppressing luminance unevenness and improving luminance. It is suitable for planning.
- the light raising part 22 protrudes to the light emitting side from the LED 17. In this way, compared to the case where the light rising portion has a projection size equivalent to that of the LED 17, it is possible to raise more light from the LED 17 toward the light emitting side by the light rising portion 22, This is more suitable for suppressing luminance unevenness and improving luminance.
- a reflection sheet 19 is provided so as to cover the light emitting side surface of the chassis 14, and the light rising portion 22 is integrally formed with the reflection sheet 19. In this way, the light in the chassis 14 is reflected by the reflection sheet 19, so that the light can be launched more efficiently toward the light emitting side.
- the light rising portions 22 are formed integrally with the reflection sheet 19, for example, it is advantageous in arranging a plurality of light rising portions 22 in the chassis 14.
- the reflection sheet 19 is made of a thermoplastic resin material. If it does in this way, the light riser part 22 can be easily shape
- the reflection sheet 19 has a white surface. In this way, a high light reflectivity can be obtained, so that light can be launched more efficiently toward the light exit side, which is more suitable for suppressing luminance unevenness and improving luminance.
- the LED 17 has a light distribution such that the light having a peak emission intensity is emitted in a radial shape while being point-shaped.
- the light irradiation area A in which the light emission intensity reaches a peak among the light emitted from the LED 17 having a dot shape is formed in an annular shape, which is more suitable for suppressing luminance unevenness.
- the LED 17 includes a light emitting unit 20 that emits light, and a lens unit 21 that is opposed to the light emitting surface 20a of the light emitting unit 20 and emits the light from the light emitting unit 20 while diffusing. In this way, the light emitted from the light emitting unit 20 can be emitted while being diffused by the lens unit 21, so that the light with the peak emission intensity is directed in a direction inclined with respect to the front direction. Light distribution can be easily designed.
- a concave portion 21b is formed on the light emitting surface (light emitting surface 21a) of the lens unit 21. In this way, the light from the light emitting unit 20 can be appropriately refracted and diffused according to the shape of the recess 21b, so that the optical design of the lens unit 21 is facilitated.
- the lens unit 21 is provided integrally with the light emitting unit 20. In this way, since the lens unit 21 and the light emitting unit 20 constituting the LED 17 are made into one component, the number of components is reduced as compared with the case where the lens unit is made a separate component from the light emitting unit 20, and the LED 17 The manufacturing cost which concerns on can be reduced.
- the light emitting unit 20 has an LED chip (LED element). In this way, high brightness and low power consumption can be achieved.
- an optical member 15 facing the light emission side with respect to the LED 17 is provided, and the light raising portion 22 is arranged in a form having a gap C between the optical member 15 and the optical member 15.
- the gap C is held between the light rising portion 22 and the optical member 15, the light rising portion 22 is difficult to be visually recognized as a dark portion. Therefore, it is suitable for suppressing luminance unevenness.
- a plurality of LEDs 17 are mounted, and an LED substrate 18 disposed in the chassis 14 is provided.
- the plurality of LEDs 17 can be collectively disposed in the chassis 14, so that assembly workability is excellent.
- Embodiment 1 of this invention was shown, this invention is not restricted to the said embodiment, For example, the following modifications can also be included.
- members similar to those in the above embodiment are denoted by the same reference numerals as those in the above embodiment, and illustration and description thereof may be omitted.
- the LED 17-1 (four LEDs 17-1 in total) is divided into one LED group 25, and the light riser 22-1 surrounds each LED group 25 individually.
- the LED group 25 is composed of four LEDs 17-1 that are arranged at almost equal intervals in the X-axis direction and the Y-axis direction.
- the X-axis direction A plurality of Y-axis directions are arranged in parallel on a plane.
- the intervals between the LED groups 25 adjacent to each other in the X-axis direction and the Y-axis direction are both substantially constant and substantially the same size, and are wider than the intervals between the LEDs 17-1 included in the LED group 25. It is made a size.
- the supported portion 23-1 in the reflection sheet 19-1 is formed in a range extending over the four LEDs 17-1 constituting the LED group 25, and has a circular shape concentric with the center between the four LEDs 17-1. There is no.
- the light rising portion 22-1 rises from the outer end of the supported portion 23-1 to the front side, and surrounds the four LEDs 17-1 constituting the LED group 25 at a time. It has a bowl shape.
- the light riser 22-1 is configured to individually surround a plurality of LED groups 25 arranged in parallel in the X-axis direction and the Y-axis direction.
- the total number of LEDs 17-1 mounted on the LED board 18-1 is preferably an integer multiple of the number of LEDs 17-1 constituting the LED group 25 (“4” in this modification).
- the LEDs 17-1 are arranged in a state in which a plurality of LEDs 17-1 are arranged in a plane in the chassis 14, and each of the plurality of LEDs 17-1 can be divided into LED groups 25.
- the light riser 22-1 is configured to individually surround the LED group 25. In this way, the number of light risers 22-1 can be reduced, and the cost can be reduced.
- the LED group 25 is arranged so that the interval between the adjacent LED groups 25 is wider than the interval between the LEDs 17-1 included in the LED group 25. By doing so, it is possible to sufficiently ensure the size of the light rising portion 22-1 that is configured to individually surround the LED group 25. As a result, the light rising function of the light rising portion 22-1 can be sufficiently exhibited, which is more suitable for suppressing luminance unevenness and improving luminance.
- the LEDs 17-1 are arranged in a state in which a plurality of LEDs 17-1 are arranged along one side (short side) of the chassis 14 and the other side (long side) perpendicular thereto.
- LED group 25 is comprised by LED17-1 arranged in parallel along the other side. In this way, the light from each LED 17-1 that is arranged in parallel along one side and the other side orthogonal thereto is efficiently raised toward the light emitting side by the light raising unit 22-1. Therefore, it is suitable for suppressing luminance unevenness and improving luminance.
- three LEDs 17-2 adjacent to each other in the X-axis direction are connected to one LED 17-2 arranged in parallel on the LED board 18-2.
- the LED group 25-2 is divided and the light riser 22-2 surrounds each LED group 25-2 individually.
- the LED group 25-2 is configured by three LEDs 17-2 linearly arranged at substantially equal intervals in the X-axis direction.
- the X-axis A plurality of each of the direction and the Y-axis direction are arranged in parallel in a plane.
- the intervals between the LED groups 25-2 adjacent to each other in the X-axis direction and the Y-axis direction are both substantially constant and substantially the same, and further, the intervals between the LEDs 17-2 included in the LED group 25-2. It is the size which becomes wider than.
- the supported portion 23-2 in the reflection sheet 19-2 is formed in a range extending over the three LEDs 17-2 constituting the LED group 25-2, and is concentric with the center of the LED 17-2 located in the center. And it has a horizontally long oval shape (elliptical shape).
- the light rising portion 22-2 rises from the outer end of the supported portion 23-2 to the front side and surrounds the three LEDs 17-2 constituting the LED group 25-2 at once. .
- the light rising portion 22-2 has an elliptical bowl shape extending in the X-axis direction as viewed in a plane, that is, along the parallel direction of the LEDs 17-2 constituting the LED group 25-2.
- a plurality of LEDs 17-2 are arranged in a straight line along one side (short side) of the chassis 14, and the plurality of LEDs 17-2 arranged in a straight line are arranged.
- the LED group 25-2 is configured, and the light rising portion 22-2 is configured to extend along the parallel direction of the LEDs 17-2 forming the LED group 25-2.
- the light riser 22 is configured to extend the light from the LEDs 17-2 arranged in parallel along one side of the chassis 14 along the parallel direction of the LEDs 17-2 forming the LED group 25-2. Since it can be efficiently launched toward the light emitting side by -2, it is suitable for suppressing luminance unevenness and improving luminance.
- the LEDs 17-3 and the light risers 22-3 are arranged in a zigzag shape (zigzag shape) as viewed in a plan view, as shown in FIG.
- the LED 17-3 and the light launching portion 22-3 form a single row by being arranged in parallel along the Y-axis direction, and the rows are arranged in the X-axis direction and the X-axis direction.
- the LEDs 17-3 and the light risers 22-3 in adjacent rows are displaced in the Y-axis direction.
- the arrangement density of the light rising portions 22-3 in the bottom portion 19a-3 of the reflection sheet 19-3 (the total area of the light rising portions 22-3 in the total area of the bottom portion 19a-3) The ratio) is higher than that described in the first embodiment, so that the emitted light of the LED 17-3 can be more efficiently activated and effectively used as outgoing light.
- the light rising portion 22-4 has a substantially arc-shaped cross section cut along the Z-axis direction (front direction), and the light rising surface 22 a. -4 is constituted by a substantially arc-shaped curved surface.
- the light rising portion 22-4 is retracted toward the LED substrate 18 side, that is, the side opposite to the light emitting side, thereby forming a bowl shape as a whole. Therefore, the cross-sectional shape obtained by cutting the light rising portion 22-4 along the Z-axis direction is a substantially arc shape, and the light rising surface 22a-4 is a surface curved in a substantially arc shape. .
- the light rising surface 22a-4 having a substantially arc shape can be efficiently raised from the LEDs 17 toward the front side.
- the angle ⁇ 2 ( ⁇ 2) formed by the light rising portion 22-4 (light rising surface 22a-4) according to the present modification with respect to the front direction (Z-axis direction) is, for example, the light rising portion 22 ⁇ 4 can be defined as an angle ⁇ 2 ( ⁇ 2) formed by a line L1 connecting the rising base end position and the rising tip position with respect to the front direction, and the angle ⁇ 2 ( ⁇ 2) The absolute value is larger than the angle ⁇ 1 ( ⁇ 1) formed by the peak light with respect to the front direction.
- the entire surface of the light rising surface 22a-4 is retracted (withdrawn) from the back side, that is, the side opposite to the light emitting side, with respect to the optical path of the light having the peak of the line L1 and the emission intensity.
- the light rising surface 22a-4 is configured by a curved surface having an arc-shaped cross section cut along the front direction.
- the light rising surface 22a-4 whose cross-sectional shape cut along the front direction is an arcuate curved surface can appropriately angle the light, and suppress uneven brightness. And it is suitable for improving luminance.
- the light rising portion 22-5 bulges toward the optical member 15 side, that is, the light emitting side, thereby narrowing the space between the light rising portion 22-5 and the optical member 15.
- disconnected along the Z-axis direction (front direction) has comprised the substantially circular arc shape by it.
- the light rising surface 22a-5 is a substantially arc-shaped curved surface that warps toward the optical member 15 side. Also in the light rising part 22-5 of such a form, it can be efficiently raised from each LED 17 toward the front side by the substantially arc-shaped light rising surface 22a-5.
- the angle ⁇ 2 ( ⁇ 2) formed by the light rising portion 22-5 (light rising surface 22a-5) according to this modification with respect to the front direction (Z-axis direction) is, for example, the light rising portion 22 ⁇ 5 can be defined as an angle ⁇ 2 ( ⁇ 2) formed by a tangent TL with the intermediate position between the rising base end position and the rising tip position as a contact point with respect to the front direction, and the same angle ⁇ 2 ( ⁇ 2) is It is assumed that the absolute value is larger than the angle ⁇ 1 ( ⁇ 1) formed by the light having the peak emission intensity in the LED 17 with respect to the front direction.
- the entire surface of the light rising surface 22a-5 is retracted (withdrawn) from the back side, that is, the side opposite to the light emitting side, with respect to the optical path of the light having the tangential line TL and the emission intensity peaking.
- the light riser 22-6 according to the present modification is inclined with respect to the front direction (Z-axis direction), and the light riser surface 22a-6 is in the front direction.
- the absolute value of the angle ⁇ 3 ( ⁇ 3) is smaller than the absolute value of the angle ⁇ 1 ( ⁇ 1) formed by the light emitted from the LED 17 having a peak emission intensity with respect to the front direction.
- the magnitude relationship of the angles is opposite to that of the first embodiment.
- the light rising portion 22-6 according to the present modification rises from the supported portion 23-6 so as not to overlap the optical path of light (the arrow line shown in FIG. 17) at which the emission intensity reaches a peak. Height (protruding dimension to the front side) is set.
- the light launching portion 22-6 has an absolute value of the angle ⁇ 3 ( ⁇ 3) formed with respect to the front direction, and an angle ⁇ 1 ( ⁇ 1) formed with respect to the front direction of light having a peak emission intensity. Although it is relatively smaller than the absolute value, it is arranged so as to be retracted (withdrawn) on the back side, that is, on the side opposite to the light emitting side with respect to the optical path of light having a peak emission intensity.
- the light rising portion 22-7 has a zigzag cross-sectional shape cut in the front direction (Z-axis direction) and an arbitrary direction intersecting the front direction. That is, the light rising portion 22-7 has a plurality of bending points between the rising base end position and the rising tip position. For this reason, the light rising surface 22a-7 is divided into a plurality of divided light rising surfaces 22a-7S across each bending point. The angles formed by the divided light rising surfaces 22a-7S with respect to the front direction are different from each other.
- the angle ⁇ 2 ( ⁇ 2) formed by the entire light rising surface 22a-7 with respect to the front direction is the front side of the plurality of bending points.
- the angle L2 ( ⁇ 2) formed by the line L2 connecting the protruding vertices with respect to the front direction can be defined, and the same angle ⁇ 2 ( ⁇ 2) indicates that the light whose emission intensity at the LED 17 reaches the peak is the front direction.
- the absolute value is larger than the angle ⁇ 1 ( ⁇ 1) formed with respect to.
- the entire surface of the light rising surface 22a-5 is retracted (retracted) from the back side, that is, the side opposite to the light emitting side, with respect to the light path of the light having the line L2 and the emission intensity peaking.
- the plurality of split light rising surfaces 22a-7S may include those having an angle of 90 degrees with respect to the front direction, those having 90 degrees or more, and those having 0 degrees. I do not care. Further, the plurality of split light rising surfaces 22a-7S may include the same angle formed with respect to the front direction. Furthermore, the angles formed with respect to the front direction of the plurality of split light rising surfaces 22a-7S may be the same. Further, it is not necessary that all of the plurality of bending points of the light rising portion 22-7 exist on the line L2, and a bending point arranged on the back side of the line L2 may exist.
- the light riser 122 individually surrounds each LED 117 and has an inverted quadrangular pyramid shape as a whole.
- the light rising portion 122 is a cross-sectional shape cut along a direction (plane along the X-axis direction and the Y-axis direction) orthogonal to the front direction (Z-axis direction), that is, a cross-sectional shape in the circumferential direction.
- four light rising surfaces 122a are provided corresponding to the four sides of the square in the light rising portion 122, and each of the light rising surfaces 122a faces the LED 117 disposed on the center side (Z direction).
- the inclined surface is inclined with respect to the axial direction.
- Valley portions 26 are formed between the light rising surfaces 122a adjacent to each other in the circumferential direction in the light rising portion 122 (boundary position).
- the trough 26 extends radially from the center of the LED 117 and is formed over the entire area of the light rising portion 122.
- the light rising portion 122 is excellent in shape stability by the valley portion 26. If the shape of the light riser 122 is stable, the angle applied to the light from the LED 117 by the light riser surface 122a becomes stable, so that the optical performance of the backlight device 112 is stable. Can be demonstrated.
- the supported portion 123 has a quadrangular shape in a plan view according to the shape of the light rising portion 122 in the circumferential direction.
- the light rising portion 122 has a square cross-sectional shape in the circumferential direction. In this way, for example, it is excellent in terms of shape stability of the light rising portion 122.
- Embodiment 2 of this invention was shown, this invention is not restricted to the said embodiment, For example, the following modifications can also be included.
- members similar to those in the above embodiment are denoted by the same reference numerals as those in the above embodiment, and illustration and description thereof may be omitted.
- a large number of LEDs 117-1 arranged in parallel on the LED board 18-1 are adjacent to each other in the X-axis direction and the Y-axis direction.
- Two LEDs 117-1 (a total of four LEDs 117-1) are divided into one LED group 125, and the light riser 122-1 surrounds each LED group 125 individually.
- the LED group 125 is composed of four LEDs 117-1 arranged at almost equal intervals in the X-axis direction and the Y-axis direction, and the mounting surface 18a-1 of the LED substrate 18-1 (see FIG. 11).
- a plurality of X-axis direction and Y-axis direction are arranged in parallel in a plane.
- the intervals between the LED groups 125 adjacent to each other in the X-axis direction and the Y-axis direction are both substantially constant and substantially the same size, and further wider than the interval between the LEDs 117-1 included in the LED group 125. It is made a size.
- the supported portion 123-1 in the reflection sheet 119-1 is formed in a range straddling the four LEDs 117-1 constituting the LED group 125, and has a quadrangular shape in which the four LEDs 117-1 are positioned at the four corners. .
- the light rising portion 122-1 rises from the outer end of the above-mentioned supported portion 123-1 toward the front side, and surrounds the four LEDs 117-1 constituting the LED group 125, and has an inverted quadrangular pyramid shape.
- the light riser 122-1 is configured to individually surround a plurality of LED groups 125 arranged in parallel in the X-axis direction and the Y-axis direction.
- the total number of LEDs 117-1 mounted on the LED board 18-1 is preferably an integer multiple of the number of LEDs 117-1 constituting the LED group 125 ("4" in this modification).
- three LEDs 117-2 adjacent to each other in the X-axis direction are arranged for a large number of LEDs 117-2 arranged in parallel on the LED board 18-2 (see FIG. 13).
- the LED group 125-2 is composed of three LEDs 117-2 that are linearly arranged at almost equal intervals in the X-axis direction, and the mounting surface 18a-2 of the LED substrate 18-2 (see FIG. 13).
- a plurality of X-axis direction and Y-axis direction are arranged in parallel on a plane.
- the distance between the LED groups 125-2 adjacent to each other in the X-axis direction and the Y-axis direction is substantially constant and substantially the same size, and further, the distance between the LEDs 117-2 included in the LED group 125-2. It is the size which becomes wider than.
- the supported portion 123-2 in the reflection sheet 119-2 is formed in a range straddling the three LEDs 117-2 constituting the LED group 125-2, and has an elongated (laterally long) rectangular shape along the X-axis direction. There is no.
- the light rising portion 122-2 rises from the outer end of the above-mentioned supported portion 123-2 toward the front side, and surrounds the three LEDs 117-2 constituting the LED group 125-2 at a time. .
- the light rising portion 122-2 has a horizontally-inverted inverted quadrangular pyramid shape extending in the X-axis direction, that is, along the parallel direction of the LEDs 117-2 constituting the LED group 125-2 when viewed in plan.
- the light rising portion 122-3 individually surrounds each LED 117-3 and is formed in an inverted triangular pyramid shape.
- the light rising portion 122-3 has a cross-sectional shape cut along a direction (surface along the X-axis direction and the Y-axis direction) orthogonal to the front direction (Z-axis direction), that is, a cross-sectional shape in the circumferential direction. It is a triangle. Accordingly, three light rising surfaces 122a-3 are provided corresponding to the three sides of the triangle in the light rising portion 122-3, and each point toward the LED 117-3 disposed on the center side. Thus, the inclined surface is inclined with respect to the front direction (Z-axis direction).
- Valley portions 26-3 are formed between the respective light rising surfaces 122a-3 adjacent to each other in the circumferential direction in the light rising portion 122-3 (boundary position).
- a triangle formed by connecting the vertices at the outer end is substantially a regular triangle.
- the light riser 122-3 is arranged so that one of the three sides coincides with the X-axis direction, and the adjacent sides are parallel to each other in the adjacent light risers 122-3. .
- the LEDs 117-3 are arranged in a substantially zigzag shape (substantially zigzag shape).
- the supported portion 123-3 in the reflection sheet 119-3 has a triangular shape in plan view with the LED 117-3 as the center.
- the LED 217 according to the present embodiment is arranged in a matrix in the LED substrate 218 with the X-axis direction as the row direction and the Y-axis direction as the column direction.
- the arrangement pitch in the Y-axis direction is smaller than the arrangement pitch in the direction (interval between adjacent LED groups 225 described below).
- a plurality (12) of LEDs 217 arranged in a straight line along the Y-axis direction and having a relatively small arrangement pitch are divided as one LED group 225.
- the LED board 218 includes an LED group 225 composed of a plurality of LEDs 217 arranged in parallel along the Y-axis direction, and an X-axis direction, that is, a Y-axis direction that is a parallel direction of the LEDs 217 constituting the LED group 225. It can be said that a plurality (eight) are arranged intermittently in the orthogonal direction.
- Each LED 217 constituting the LED group 225 is arranged so as to cross the bottom plate 214a of the chassis 214 over the entire length in the short side direction.
- the arrangement pitch of the LEDs 217 constituting the LED group 225 that is, the interval between the LEDs 217 adjacent in the Y-axis direction is substantially equal.
- the interval between the LEDs 217 adjacent in the Y-axis direction is sufficiently narrower than the interval between the LED groups 225 adjacent in the X-axis direction.
- the interval between the LED groups 225 (LEDs 217) adjacent in the X-axis direction is substantially equal.
- the light riser 222 is configured to individually surround each LED group 225. Specifically, the light riser 222 is configured to extend along the Y-axis direction, that is, along the parallel direction of the LEDs 217 constituting the LED group 225, and is almost in the short side direction at the bottom 219a of the reflection sheet 219. It has a length that spans the entire length. As a result, the light riser 222 can surround all of the plurality (12) of LEDs 217 included in the LED group 225 in a lump.
- the light riser 222 has an elongated, vertically long quadrangular pyramid shape along the Y-axis direction, and a direction (surface along the X-axis direction and the Y-axis direction) orthogonal to the front direction (Z-axis direction).
- the cross-sectional shape cut along the line, that is, the cross-sectional shape in the circumferential direction is a vertically long rectangle.
- two sides facing the LED group 225 in the Y-axis direction are continuously connected to the rising portion 219b in the reflection sheet 219 without any step.
- the inclination angle with respect to the front direction is substantially the same.
- the supported portion 223 in the reflection sheet 219 is formed in a range extending over all the LEDs 217 constituting the LED group 225, and has an elongated rectangular shape along the Y-axis direction. Note that the detailed cross-sectional shape of the light riser 222 other than the above is substantially the same as that of the second embodiment described above, and a duplicate description is omitted.
- a plurality of LEDs 217 are arranged linearly in parallel along one side (short side) of the chassis 214, and the LED group 225 is composed of the plurality of LEDs 217 arranged in parallel.
- the light riser 222 is configured to extend along the parallel direction of the LEDs 217 forming the LED group 225. In this way, the light from the LEDs 217 arranged in parallel along one side of the chassis 214 is efficiently emitted by the light riser 222 configured to extend along the parallel direction of the LEDs 217 forming the LED group 225. Since it can be raised toward the side, it is suitable for suppressing luminance unevenness and improving luminance.
- Embodiment 4 A fourth embodiment of the present invention will be described with reference to FIG. In this Embodiment 4, what changed the structure of LED317 is shown. In addition, the overlapping description about the same structure, effect
- the LED 317 is configured by only the light emitting unit 320, and the lens unit 321 is a separate component from the LED 317. That is, it can be said that the light source 27 according to the present embodiment includes the LED 317 having only the light emitting unit 320 and the lens unit 321. Specifically, an LED 317 including a light emitting unit 320 having an LED chip as a light emitting source is surface-mounted on the LED substrate 318, and a lens unit 321 is attached to face the light emitting surface 320a of the LED 317.
- the lens portion 321 has a substantially disk shape having a diameter larger than that of the LED 317 and is concentrically arranged with respect to the LED 317.
- the light emitting surface 321a in the lens portion 321 is formed in a flat and substantially hemispherical shape, and a concave portion 321b is formed in the center thereof.
- the lens portion 321 is formed with a plurality of attachment leg portions 321 c that protrude toward the back side, and these attachment leg portions 321 c are attached to the LED substrate 318.
- the light incident surface 321d of the lens portion 321 is opposed to the light emitting surface 320a of the LED 317 with a predetermined interval by the mounting leg portion 321c, and the center (the portion facing the LED 317) is the first.
- Two concave portions 321e are formed.
- the reflection sheet 319 is formed with a light source insertion hole 319d having a size allowing the lens portion 321 to pass through with the LED 317.
- the lens unit 321 is a separate component from the light emitting unit 320. In this way, a configuration that does not have the lens unit 321 as the light emitting unit 320 can be used. Thereby, the manufacturing cost regarding the light emission part 320 can be reduced. In addition, the degree of freedom in optical design of the lens unit 321 is high, which is suitable for suppressing luminance unevenness.
- Embodiment 5 of the present invention will be described with reference to FIG.
- the light rising portion 422 is separated from the reflection sheet 419.
- action, and effect as above-mentioned Embodiment 1 is abbreviate
- the bottom portion 419a of the reflection sheet 419 has a flat shape extending along the LED substrate 418 over the entire area, whereas another component is provided for the bottom portion 419a.
- the light riser 422 is made of a synthetic resin and has a white surface with excellent light reflectivity.
- the light rising portion 422 has a size so as to cover the bottom portion 419a over almost the entire area, and a light rising concave portion 28 having an inverted conical shape is formed in a portion corresponding to each LED 417.
- a light rising surface 422 a is configured by the peripheral surface of the light rising recess 28.
- the present invention is not limited to the embodiments described with reference to the above description and drawings.
- the following embodiments are also included in the technical scope of the present invention.
- the following configuration may be adopted. That is, regarding the arrangement of the LEDs 217 ′, as shown in FIG. 29, the arrangement pitch in the X-axis direction is made smaller than the arrangement pitch in the Y-axis direction, and a plurality (26) arranged in parallel in the X-axis direction.
- One LED group 225 ' is constituted by the LEDs 217'.
- the light rising portion 222 ' extends along the X-axis direction so as to collectively surround all the LEDs 217' constituting the LED group 225 '.
- the specific numerical value of the angle formed by the light with the peak emission intensity in the emitted light of the LED with respect to the front direction is appropriately changed from the value shown in FIG. Is possible.
- the angle is preferably in the range of 20 degrees to 85 degrees, more preferably in the range of 45 degrees to 85 degrees, and even more preferably in the range of 60 degrees to 80 degrees. Even more preferred.
- the angle may be in the range of 0 to 20 degrees.
- the light distribution distribution of the LEDs is shown to be almost symmetric.
- the light distribution may be a light distribution (a light distribution in which a plurality of peaks having different emission intensities exist) which is strictly asymmetrical due to a slight deviation in the light distribution.
- the angle formed by the light rising surface with respect to the front direction is set to be larger than the angle formed by the peak light with the maximum light emission intensity with respect to the front direction, or the light emission intensity of the second and subsequent magnitudes. It is possible to set larger than the angle formed by the peak light to be the front direction.
- the light distribution of the light emitted from the LED and having a light distribution that minimizes the light emission intensity of the light toward the front (the light having an angle of 0 degrees in FIG. 8) is shown. It is also possible to have a light distribution in which light traveling in the front direction becomes one of the peaks of emission intensity. Even in that case, it is preferable that the peak due to the light toward the front direction is set to have a light emission intensity smaller than the peak due to the light toward the direction inclined with respect to the front direction.
- the angle formed by the light rising surface with respect to the front direction and the light with the peak emission intensity among the light emitted from the LEDs is the front.
- the absolute value of the angle formed with respect to the direction has a magnitude relationship
- the angle formed by the light rising surface with respect to the front direction and the light whose emission intensity peaks among the emitted light of the LED do not have a magnitude relationship, and can be set to be substantially the same.
- the cross-sectional shape cut along the front direction and any direction intersecting with the light rising portion is appropriately It can be changed.
- the cross-sectional shape may be a curved shape (for example, a wave shape) other than an arc shape.
- the angle formed by the light rising portion with respect to the front direction is, for example, “the light rising portion passes through the apex protruding toward the light emitting side and light It can be defined as “the angle formed by the reference line arranged on the light emitting side with respect to the rising portion with respect to the front direction”.
- one LED group is configured by three LEDs arranged along the X-axis direction.
- the LEDs are arranged along the Y-axis direction.
- One LED group may be constituted by three LEDs.
- the light riser is configured to extend along the Y-axis direction.
- the specific number of LEDs constituting the LED group can be changed as appropriate.
- two or more types of LEDs forming the LED group may be mixed. Specifically, for example, an LED group including four LEDs and an LED group including three LEDs are included in one chassis. It does not matter if they are mixed.
- Modifications 1 and 2 of Embodiments 1 and 2, Embodiment 3 above, and (1) described above exemplify a case where a plurality of LEDs constituting an LED group are arranged at equal intervals.
- a configuration in which a plurality of LEDs constituting the LED group are arranged at unequal intervals is also included in the present invention.
- the light rising portion is exemplified as an inverted quadrangular pyramid or an inverted triangular pyramid, but other inverted polygonal pyramids, such as an inverted pentagonal pyramid, An inverted hexagonal pyramid shape or the like is also possible.
- the cross-sectional shape obtained by cutting the light rising portion along the direction orthogonal to the front direction may be a rhombus or a parallelogram.
- a so-called collective light of a form that surrounds a single LED that is, a so-called individual light riser and a plurality of LEDs (LED groups) collectively. You may make it mix a starting part.
- the reflection sheet is shown as a single component.
- the reflection sheet may be composed of a plurality of divided components. In that case, it is preferable that the light rising portion is provided integrally with each of the plurality of divided parts.
- the reflection sheet can be omitted. In that case, it is preferable to form a light reflecting portion having excellent light reflectivity on the surface of the LED substrate.
- liquid crystal panel and the chassis are illustrated in a vertically placed state in which the short side direction coincides with the vertical direction.
- the liquid crystal panel and the chassis have the long side direction in the vertical direction.
- Those that are in a vertically placed state matched with are also included in the present invention.
- a TFT is used as a switching element of a liquid crystal display device.
- the present invention can also be applied to a liquid crystal display device using a switching element other than TFT (for example, a thin film diode (TFD)).
- a switching element other than TFT for example, a thin film diode (TFD)
- the present invention can also be applied to a liquid crystal display device for monochrome display.
- liquid crystal display device using the liquid crystal panel as the display panel has been exemplified, but the present invention can also be applied to a display device using another type of display panel.
- the television receiver provided with the tuner is exemplified, but the present invention is also applicable to a display device that does not include the tuner.
- SYMBOLS 10 Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12, 112 ... Backlight device (illumination device), 14, 214 ... Chassis, 15 ... Optical member, 17, 117, 217, 317, 417 ... LED (light source), 18, 218, 318, 418 ... LED substrate (light source substrate), 19, 219, 319, 419 ... reflective sheet (reflective member), 20, 320 ... light emitting unit, 21, 321 ... lens unit , 21a, 321a ... light emitting surface (surface on the light emitting side), 21b, 321b ... concave, 22, 122, 222, 422 ...
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Abstract
Description
なお、光源としてLEDを用いたバックライト装置の一例として下記特許文献1に記載されたものが知られている。
ところで、上記のようにLED基板を備えた液晶表示装置において、例えば薄型化を図る場合には、光学部材とLEDとの間の距離を短くする必要がある。しかしながら、そうするとLEDからの光が十分に拡散されることなく光学部材に照射されるため、LEDが配置された領域と、LEDが配置されていない領域とで明暗の差が大きくなり、光学部材からの出射光に輝度ムラが生じることが懸念される。それ以外にも、例えば低消費電力化や製造コストの低減を図るべく、LEDの設置個数を削減した場合には、隣り合うLED間の間隔が広くなるため、やはりLEDが配置された領域と、LEDが配置されていない領域とで明暗の差が大きくなり、輝度ムラが生じるおそれがあった。
本発明の照明装置は、発光強度がピークとなる光が正面方向に対して傾いた方向へ向かうような配光分布を有する光源と、前記光源を収容しその光出射側に向けて開口するシャーシと、前記光源の設置面から前記光出射側に突出することで光を前記光出射側に向けて立ち上げる光立ち上げ部とを備える。
なお、ここで言う「正面方向」は、例えば「当該照明装置における光出射面に対する法線方向」として定義することができる。
(1)前記光立ち上げ部は、前記正面方向に対して傾くとともに前記光源を指向する光立ち上げ面を有する。このようにすれば、光に対して光立ち上げ面が正面方向に対してなす傾き角度に応じた角度付けをすることができるので、光源の発光光のうち、正面方向に対してなす角度が大きな光を効率的に立ち上げて出射光として有効利用することが可能となる。これにより、輝度ムラの抑制及び輝度の向上により好適となる。
なお、ここで言う「光路」は、例えば「光源から発せられて他の部材により反射または屈折されることなく進行する光の軌跡」として定義することができる。
本発明によれば、輝度ムラを抑制することができる。
本発明の実施形態1を図1から図9によって説明する。本実施形態では、液晶表示装置10について例示する。なお、各図面の一部にはX軸、Y軸及びZ軸を示しており、各軸方向が各図面で示した方向となるように描かれている。また、図4及び図5に示す上側を表側とし、同図下側を裏側とする。
なお、ここで言う「正面方向」は、例えば「当該バックライト装置12における光出射面に対する法線方向」として定義することができる。
なお、ここで言う「光路」は、例えば「LED17から発せられて他の部材(例えば光学部材15など)により反射または屈折されることなく進行する光の軌跡」として定義することができる。
実施形態1の変形例1について図10または図11を用いて説明する。ここでは、光立ち上げ部22‐1の形成範囲などを変更したものを示す。
実施形態1の変形例2について図12または図13を用いて説明する。ここでは、上記した変形例1から光立ち上げ部22‐2の形成範囲などを変更したものを示す。
実施形態1の変形例3について図14を用いて説明する。ここでは、LED17‐3及び光立ち上げ部22‐3の配置を変更したものを示す。
実施形態1の変形例4について図15を用いて説明する。ここでは、光立ち上げ部22‐4におけるZ軸方向に沿って切断した断面形状を変更したものを示す。
実施形態1の変形例5について図16を用いて説明する。ここでは、上記した変形例4からさらに光立ち上げ部22‐5の断面形状を変更したものを示す。
実施形態1の変形例6について図17を用いて説明する。ここでは、正面方向に対する光立ち上げ部22‐6の傾斜角度を変更したものを示す。
実施形態1の変形例7について図18を用いて説明する。ここでは、光立ち上げ部22‐7の形状を変更したものを示す。
本発明の実施形態2を図19または図20によって説明する。この実施形態2では、光立ち上げ部122におけるX軸方向及びY軸方向に沿って切断した断面形状を変更したものを示す。なお、上記した実施形態1と同様の構造、作用及び効果について重複する説明は省略する。また、本実施形態に係る光立ち上げ部122の断面形状は、上記した実施形態1に係る図4,図5及び図7に示した光立ち上げ部22と同様であるため、本実施形態では、これらの図面を援用するものとし、重複する図面の記載を省略している。
実施形態2の変形例1について図21を用いて説明する。ここでは、光立ち上げ部122‐1の形成範囲などを変更したものを示す。なお、本変形例に係る光立ち上げ部122‐1の断面形状は、上記した実施形態1の変形例1に係る図11に示した光立ち上げ部22‐1と同様であるため、本変形例では、この図面を援用するものとし、重複する図面の記載を省略している。
実施形態2の変形例2について図22を用いて説明する。ここでは、上記した実施形態2の変形例1から光立ち上げ部122‐2の形成範囲などを変更したものを示す。なお、本変形例に係る光立ち上げ部122‐2の断面形状は、上記した実施形態1の変形例2に係る図13に示した光立ち上げ部22‐2と同様であるため、本変形例では、この図面を援用するものとし、重複する図面の記載を省略している。
実施形態2の変形例3について図23を用いて説明する。ここでは、光立ち上げ部122‐3の形状などを変更したものを示す。
本発明の実施形態3を図24から図26によって説明する。この実施形態3では、上記した実施形態2からLED217の配置、及び光立ち上げ部222の形状を変更したものを示す。なお、上記した実施形態2と同様の構造、作用及び効果について重複する説明は省略する。
本発明の実施形態4を図27によって説明する。この実施形態4では、LED317の構成を変更したものを示す。なお、上記した実施形態1と同様の構造、作用及び効果について重複する説明は省略する。
本発明の実施形態5を図28によって説明する。この実施形態5では、光立ち上げ部422を反射シート419とは別体としたものを示す。なお、上記した実施形態1と同様の構造、作用及び効果について重複する説明は省略する。
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。
(1)上記した実施形態3の変形例として、下記のような構成とすることも可能である。すなわち、LED217′の配置について、図29に示すように、Y軸方向についての配列ピッチよりもX軸方向についての配列ピッチの方が小さくなるようにし、X軸方向について並列する複数(26個)のLED217′により1つのLED群225′を構成する。そして、光立ち上げ部222′は、LED群225′を構成するLED217′を全て一括して取り囲むよう、X軸方向に沿って延在する形態とする。
Claims (31)
- 発光強度がピークとなる光が正面方向に対して傾いた方向へ向かうような配光分布を有する光源と、
前記光源を収容しその光出射側に向けて開口するシャーシと、
前記光源の設置面から前記光出射側に突出することで光を前記光出射側に向けて立ち上げる光立ち上げ部とを備える照明装置。 - 前記光立ち上げ部は、前記正面方向に対して傾くとともに前記光源を指向する光立ち上げ面を有する請求項1記載の照明装置。
- 前記光立ち上げ面は、前記光源の発光光のうち発光強度がピークとなる光の光路とは重ならないよう、その光路に対して前記光出射側とは反対側に配されている請求項2記載の照明装置。
- 前記光立ち上げ面は、前記正面方向に対してなす角度が、前記光源の発光光のうち発光強度がピークとなる光が前記正面方向に対してなす角度よりも大きくなるものとされる請求項3記載の照明装置。
- 前記光立ち上げ面、及び前記光源の発光光のうち発光強度がピークとなる光が、前記正面方向に対してなす角度は、それぞれ45度~90度の範囲とされる請求項4記載の照明装置。
- 前記光立ち上げ面、及び前記光源の発光光のうち発光強度がピークとなる光が、前記正面方向に対してなす角度は、それぞれ60度~80度の範囲とされる請求項5記載の照明装置。
- 前記光源は、前記シャーシ内に複数が平面的に並んだ状態で配されており、
前記光立ち上げ部は、前記光源を個別に取り囲む形態とされる請求項1から請求項6のいずれか1項に記載の照明装置。 - 前記光源は、隣り合う前記光源との間の間隔が一定となるよう配されている請求項7記載の照明装置。
- 前記光源は、前記シャーシ内に複数が平面的に並んだ状態で配されるとともに、そのうちの複数ずつをそれぞれ光源群として区分することができるものとされており、
前記光立ち上げ部は、前記光源群を個別に取り囲む形態とされる請求項1から請求項6のいずれか1項に記載の照明装置。 - 前記光源群は、隣り合う前記光源群との間の間隔が、前記光源群に含まれる前記光源間の間隔よりも広くなるよう配されている請求項9記載の照明装置。
- 前記光源は、前記シャーシ内において前記シャーシにおける一方の辺及びそれと直交する他方の辺に沿ってそれぞれ複数ずつ並んだ状態で配されており、
前記一方の辺及び前記他方の辺に沿ってそれぞれ複数ずつ並列する前記光源により前記光源群が構成されている請求項9または請求項10記載の照明装置。 - 前記光源は、複数が前記シャーシにおける一辺に沿って直線的に並列して配され、これら直線的に並列した複数の前記光源により前記光源群が構成されているのに対し、前記光立ち上げ部は、前記光源群をなす前記光源の並列方向に沿って延在する形態とされる請求項9または請求項10記載の照明装置。
- 前記光立ち上げ部は、周方向についての断面形状が円形をなしている請求項7から請求項12のいずれか1項に記載の照明装置。
- 前記光立ち上げ部は、周方向についての断面形状が角形をなしている請求項7から請求項12のいずれか1項に記載の照明装置。
- 前記光立ち上げ面は、前記正面方向に沿って切断した断面形状が傾斜面により構成されている請求項2から請求項14のいずれか1項に記載の照明装置。
- 前記光立ち上げ面は、前記正面方向に沿って切断した断面形状が円弧状の曲面により構成されている請求項2から請求項14のいずれか1項に記載の照明装置。
- 前記光立ち上げ部は、前記光源よりも前記光出射側に突出している請求項1から請求項16のいずれか1項に記載の照明装置。
- 前記シャーシにおける前記光出射側の面を覆うようにして配される反射部材が備えられており、
前記光立ち上げ部は、前記反射部材に一体形成されている請求項1から請求項17のいずれか1項に記載の照明装置。 - 前記反射部材は、熱可塑性樹脂材料からなる請求項18記載の照明装置。
- 前記反射部材は、表面が白色を呈するものとされる請求項18または請求項19記載の照明装置。
- 前記光源は、点状をなすとともに、発光強度がピークとなる光が放射状に発せられるような配光分布を有するものとされる請求項1から請求項20のいずれか1項に記載の照明装置。
- 前記光源は、光を発する発光部と、前記発光部の発光面に対して対向状をなすとともに前記発光部からの光を拡散させつつ出射させるレンズ部とから構成される請求項1から請求項21のいずれか1項に記載の照明装置。
- 前記レンズ部における前記光出射側の面には、凹部が形成されている請求項22記載の照明装置。
- 前記レンズ部は、前記発光部に一体に設けられている請求項22または請求項23記載の照明装置。
- 前記レンズ部は、前記発光部とは別部品とされる請求項22または請求項23記載の照明装置。
- 前記発光部は、LED素子を有する請求項22から請求項25のいずれか1項に記載の照明装置。
- 前記光源に対して前記光出射側に対向する光学部材が備えられており、
前記光立ち上げ部は、前記光学部材との間に空隙を保有する形で配されている請求項1から請求項26のいずれか1項に記載の照明装置。 - 前記光源が複数実装されるとともに前記シャーシ内に配される光源基板が備えられている請求項1から請求項27のいずれか1項に記載の照明装置。
- 請求項1から請求項28のいずれか1項に記載の照明装置と、前記照明装置からの光を利用して表示を行う表示パネルとを備える表示装置。
- 前記表示パネルは、一対の基板間に液晶を封入してなる液晶パネルとされる請求項29記載の表示装置。
- 請求項29または請求項30に記載された表示装置を備えるテレビ受信装置。
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Also Published As
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US9341766B2 (en) | 2016-05-17 |
CN102933893B (zh) | 2015-06-03 |
CN102933893A (zh) | 2013-02-13 |
JP5357334B2 (ja) | 2013-12-04 |
JPWO2011158555A1 (ja) | 2013-08-19 |
US20130070165A1 (en) | 2013-03-21 |
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