WO2011070872A1 - Dispositif d'éclairage, dispositif d'affichage, et dispositif de réception de télévision - Google Patents

Dispositif d'éclairage, dispositif d'affichage, et dispositif de réception de télévision Download PDF

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Publication number
WO2011070872A1
WO2011070872A1 PCT/JP2010/069166 JP2010069166W WO2011070872A1 WO 2011070872 A1 WO2011070872 A1 WO 2011070872A1 JP 2010069166 W JP2010069166 W JP 2010069166W WO 2011070872 A1 WO2011070872 A1 WO 2011070872A1
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WO
WIPO (PCT)
Prior art keywords
light source
source group
led
end side
disposed
Prior art date
Application number
PCT/JP2010/069166
Other languages
English (en)
Japanese (ja)
Inventor
敬治 清水
Original Assignee
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Priority to EP10835794.8A priority Critical patent/EP2511590A4/fr
Priority to JP2011545147A priority patent/JP5337883B2/ja
Priority to CN201080055722.7A priority patent/CN102667312B/zh
Priority to US13/512,353 priority patent/US20120236213A1/en
Publication of WO2011070872A1 publication Critical patent/WO2011070872A1/fr

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Classifications

    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133613—Direct backlight characterized by the sequence of light sources

Definitions

  • the present invention relates to a lighting device, a display device, and a television receiver.
  • the central portion has a high light source arrangement density and relatively high luminance, while the peripheral portion has a low light source arrangement density, The brightness becomes relatively low.
  • the corners (four corners) of the chassis have a particularly low light source arrangement density and a significant decrease in luminance. As a result, luminance unevenness may occur.
  • the present invention has been completed based on the above circumstances, and an object thereof is to provide a lighting device capable of suppressing luminance unevenness. Moreover, it aims at providing the display apparatus provided with such an illuminating device, and a television receiver.
  • an illumination device of the present invention includes a plurality of light sources and a chassis having a bottom portion that has a planar view shape and accommodates the plurality of light sources, and the plurality of light sources includes: A light source group consisting of a plurality of the light sources arranged along the row direction is arranged in a matrix so as to form a row direction and a column direction along the surface of the bottom. A central-side light source group disposed on the center side of the bottom portion, and an end-side light source group disposed on the end side further than the central-side light source group, and disposed at the extreme end on one end side in the end-side light source group.
  • the light source is characterized in that it is arranged on the outer side in the row direction at the bottom part rather than the light source arranged at the outermost end on the one end side in the central side light source group.
  • the arrangement density of the light sources is less at the corners of the bottom than at the center, and it tends to be dark.
  • a configuration in which the number of light sources at the corners of the bottom is increased can be considered.
  • an increase in the number of light sources is not preferable because it leads to an increase in component costs and power consumption.
  • the light source disposed at the outermost end on the one end side in the end side light source group is placed on the outer side in the row direction at the bottom than the light source disposed at the outermost end on the one end side in the central side light source group. It was set as the structure to distribute. That is, the light source (light source close to the bottom corner) arranged at one end side in the end side light source group is arranged closer to the bottom corner. Thereby, it can suppress that the brightness
  • the luminance reduction at the corners is suppressed by adjusting the arrangement of the light sources. For this reason, for example, compared with the structure which adds a light source to a corner part, it becomes possible to avoid a cost increase.
  • arranged to the both ends in the said edge part side light source group is each distribute
  • the light source arranged at the outermost end on the one end side is arranged on the outer side in the column direction at the bottom rather than the adjacent light sources in the end side light source group.
  • the light source disposed at the extreme end on the one end side can be disposed closer to the corresponding corner portion on the bottom portion, and the luminance reduction at the corner portion can be more effectively reduced. Can be suppressed.
  • the end side light source group is arranged in a plurality of rows in the column direction, and the first end side light source group arranged on the end side of the bottom portion in the column direction, and the bottom portion further than this
  • a second end-side light source group disposed on the center side of the first end-side light source group, the light source disposed at the outermost end on the one end side in the first end-side light source group. It may be arranged on the outer side in the row direction at the bottom part rather than the light source arranged at the outermost end on the one end side in the part side light source group.
  • the light source groups may be arranged in at least three rows in the row direction, and the light source groups at both ends in the row direction may be the end side light source groups, respectively.
  • the light source group at both ends in the column direction it is possible to suppress a decrease in luminance at each corner corresponding to the light source disposed at the extreme end on the one end side.
  • a diffusion lens capable of diffusing light from the light source may be disposed on the light emission side of the light source.
  • an LED can be exemplified. Thereby, it is possible to achieve high brightness and low power consumption.
  • 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.
  • 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, for example, a desktop screen of a television or a personal computer, and is particularly suitable for a large screen.
  • a television receiver includes the display device.
  • the disassembled perspective view which shows schematic structure of the television receiver which concerns on Embodiment 1 of this invention.
  • the disassembled perspective view which shows schematic structure of the liquid crystal display device with which the television receiver of FIG. 1 is provided.
  • the top view which shows the backlight apparatus with which the liquid crystal display device of FIG. 2 is provided.
  • Sectional drawing which shows the cross-sectional structure along the long side direction of the liquid crystal display device of FIG. 2 (iv-iv line sectional drawing of FIG. 3).
  • Sectional drawing which shows the cross-sectional structure along the short side direction of the liquid crystal display device of FIG. 2 (vv line sectional drawing of FIG. 3).
  • the expanded sectional view which expanded the LED periphery in FIG.
  • the top view which shows the backlight apparatus which concerns on Embodiment 2 of this invention.
  • the top view which shows the backlight apparatus which concerns on Embodiment 3 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. Part of each drawing shows an X axis, a Y axis, and a Z axis.
  • the long side direction of the liquid crystal display device 10 and the liquid crystal panel 11 (described later) is the X axis direction, and the short side direction is the Y axis direction. Yes.
  • the vertical direction in FIGS. 4 and 5 is the Z-axis direction (front and back direction), and the upper side in the figure is the front side and the lower side in the figure is the 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 10 (display device) has a horizontally long 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 12 (illumination device) that is an external light source, which are integrated by a frame-like bezel 13 or the like. Is supposed to be retained.
  • the screen size is 42 inches and the aspect ratio is 16: 9.
  • the liquid crystal panel 11 (display panel) has a horizontally long rectangular shape (rectangular shape) in a plan view, and a pair of glass substrates are bonded together with a predetermined gap therebetween, and both glass substrates. The liquid crystal is sealed between them.
  • 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 glass substrates.
  • the backlight device 12 is a so-called direct-type backlight device in which a plurality of LEDs 17 are provided immediately below the back surface of the panel surface (display surface) of the liquid crystal panel 11. As shown in FIG. 2, the backlight device 12 covers a substantially box-shaped chassis 14 having an opening 14 b on the light emitting surface side (the liquid crystal panel 11 side), and covers the opening 14 b of the chassis 14.
  • optical members arranged (diffusing plate 15a and a plurality of optical sheets 15b arranged between the diffusing plate 15a and the liquid crystal panel 11), the outer edge of the optical member 15 group arranged along the outer edge of the chassis 14 And a chassis 16 that covers the entire inner surface of the chassis 14 and reflects the light in the chassis 14 toward the optical member 15 side.
  • the chassis 14 accommodates a plurality of LED units U (light source units) each having a light source LED 17 (Light Emitting Diode), and the LED unit U with respect to the chassis 14.
  • a holding member 20 is provided.
  • the optical member 15 side (front side) from the LED unit U is the light emitting side.
  • the chassis 14 is made of metal. As shown in FIGS. 3 to 5, the chassis 14 has a horizontally long bottom (rectangular) bottom plate 14a as in the liquid crystal panel 11, and outside the sides of the bottom plate 14a. It consists of a side plate 14c rising from the end and a receiving plate 14d projecting outward from the rising end of each side plate 14c, and as a whole has a shallow substantially box shape (substantially shallow dish shape) opened toward the front side.
  • 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).
  • a frame 16 and an optical member 15 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 bottom plate 14a of the chassis 14 may not have a horizontally long shape, and may be, for example, a square shape.
  • the optical member 15 has a horizontally long rectangular shape (rectangular shape) in a plan view like the liquid crystal panel 11 and the chassis 14. As shown in FIGS. 4 and 5, 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 unit U. Arranged.
  • the optical member 15 includes a diffusion plate 15a disposed on the back side (the LED unit U side, the 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). Is done.
  • 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. 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 (FIG. 4).
  • the frame 16 can receive the outer edge of the liquid crystal panel 11 from the back side.
  • the bezel 13 is screwed to the front side of the frame 16 with screws (not shown). Thereby, the outer edge portion of the liquid crystal panel 11 can be sandwiched between the bezel 13 and the frame 16.
  • the LED unit U As shown in FIG. 3, the LED units U have a shape that is long in the X-axis direction, and a plurality of sets (9 sets in the present embodiment) are arranged along the Y-axis direction. As shown in FIGS. 3 and 4, the LED unit U is mainly composed of an LED 17 (light source) and an LED substrate 18 on which the LED 17 is mounted. Further, the LED unit U is provided with a diffusing lens 19 attached to a position corresponding to the LED 17 on the LED substrate 18 and a substrate reflection sheet 23. Next, components of the LED unit U will be described.
  • the LEDs 17 are a kind of point light source that has a point shape when seen in a plan view, and a plurality of LEDs 17 are arranged along the long side direction (X-axis direction) of the LED substrate 18.
  • the LED 17 is configured by sealing an LED chip with a resin material.
  • This LED chip has, for example, one main emission wavelength, and specifically, one that emits blue light in a single color is used.
  • a phosphor that converts blue light emitted from the LED chip into white light is dispersed and blended in the resin material for sealing the LED chip. As a result, the LED 17 can emit white light.
  • the LED 17 is a so-called top type in which the surface opposite to the mounting surface with respect to the LED substrate 18 (surface facing the front side) is the light emitting surface 17a (light emitting surface).
  • the optical axis E1 of the LED 17 is set to substantially coincide with the Z-axis direction (direction orthogonal to the main plate surfaces of the liquid crystal panel 11 and the optical member 15).
  • the light emitted from the LED 17 spreads radially to some extent within a predetermined angle range around the optical axis E1, but its directivity is higher than that of a cold cathode tube or the like. . That is, the light emission intensity of the LED 17 shows an angular distribution in which the direction along the optical axis E1 is conspicuously high and decreases rapidly as the tilt angle with respect to the optical axis E1 increases.
  • the LED substrate 18 has a rectangular shape that is long in the X-axis direction in plan view, the long-side direction matches the X-axis direction, and the short-side direction is the Y-axis direction.
  • the chassis 14 is accommodated while extending along the bottom plate 14a. That is, the LED 17 is disposed on the bottom plate 14 a of the chassis 14.
  • the connector part 18a is provided in the both ends of the long side direction in the LED board 18. As shown in FIG.
  • the diffusing lens 19 is made of a synthetic resin material (for example, polycarbonate or acrylic) that is almost transparent (having high translucency) and has a refractive index higher than that of air. As shown in FIG. 6, the diffusing lens 19 has a lens body 19 a that has a predetermined thickness and has a substantially circular shape when seen in a plan view. Are attached individually so as to cover each of the LEDs 17 in a plan view.
  • a synthetic resin material for example, polycarbonate or acrylic
  • a leg portion 19e is projected from the periphery of the lower surface 19b of the diffusing lens 19.
  • the leg portions 19e are arranged at three substantially equal intervals (approximately 120 ° intervals) along the peripheral edge of the diffusion lens 19 in a plan view.
  • the surface of the LED substrate 18 with an adhesive or a thermosetting resin. It is fixed to.
  • the lower surface of the diffusing lens 19 the surface facing the LED 17 and the LED substrate 18
  • a portion that overlaps with the LED 17 in plan view is formed with a substantially conical incident recess 19d that is recessed upward. Light from the LED 17 is incident on 19d.
  • the lower surface of the diffusing lens 19 is subjected to a surface roughening process such as a graining process.
  • the upper surface of the diffusing lens 19 (the surface facing the diffusing plate 15a) is formed with a concave portion 19f that is recessed downward in the center (a portion that overlaps the LED 17 in plan view).
  • a light exit surface 19c having a continuous arc is formed.
  • the light emitted from the LED 17 is diffused in a planar shape by being refracted between the air layer and the incident concave portion 19d and between the light emitting surface 19c and the air layer, and is diffused from the light emitting surface 19c over a wide angle range. Irradiated to the plate 15a side. In this way, the diffuser lens 19 can emit light having a strong directivity emitted from the light emitting surface 17a of the LED 17 while diffusing.
  • the region of the light emitting surface 19c that overlaps with the LED 17 when viewed in a plane is a region where the amount of light from the LED 17 is extremely larger than other regions, and the brightness is locally increased. Therefore, by forming the concave portion 19f described above at the center of the upper surface of the diffusing lens 19, most of the light from the LED 17 is emitted while being refracted at a wide angle, or part of the light from the LED 17 is on the LED substrate 18 side. Can be reflected. Thereby, it can suppress that the brightness
  • each LED board 18 is provided with a board reflection sheet 23 having a size that individually covers them.
  • the board reflection sheet 23 is made of, for example, a synthetic resin, and has a white surface with excellent light reflectivity.
  • the board reflection sheet 23 extends along the LED board 18 and is formed in a rectangular shape as viewed in a plan view, which is substantially the same outer shape as the LED board 18.
  • the board reflection sheet 23 is arranged so as to overlap the front side surface of the LED board 18, that is, the mounting surface of the LED 17, and covers almost the entire area from the front side.
  • the board reflection sheet 23 is interposed between the diffusion lens 19 and the LED board 18. Specifically, the board reflection sheet 23 is arranged so as to overlap with a lens insertion hole 22b (described later) formed in the chassis reflection sheet 22 in a plan view, and in the lens insertion hole 22b. Light incident in the corresponding region can be reflected to the diffusion lens 19 side. As a result, the light utilization efficiency can be increased, and the luminance can be improved. In other words, sufficient brightness can be obtained even when the number of LEDs 17 is reduced to reduce the cost.
  • LED insertion holes 23 a through which the LEDs 17 are passed are formed at positions of the board reflection sheet 23 that overlap with the LEDs 17 on the LED board 18 in a plan view.
  • the diameter dimension of the LED insertion hole 23 a is larger than that of the LED 17, it is smaller than the lens insertion hole 22 b and the diffusion lens 19 of the chassis reflection sheet 22.
  • leg reflection holes 23 are formed with leg insertion holes 23b through which the respective leg portions 19e of the respective diffusion lenses 19 can be inserted.
  • the leg insertion hole 23b has a substantially circular shape that follows the outer shape of the leg 19e when viewed in a plan view, and its diameter is slightly larger than that of the leg 19e.
  • the LED units U composed of the above-described components are arranged in parallel in the chassis 14 in a state where the long side direction and the short side direction are aligned with each other in the X-axis direction and the Y-axis direction.
  • the LED unit U (LED board 18) has a row direction in the X-axis direction (the long side direction of the chassis 14 and the LED board 18) in the chassis 14, and the Y-axis direction (the short side of the chassis 14 and the LED board 18).
  • (Direction) is the column direction (arranged in a matrix).
  • the plurality of LEDs 17 are arranged in a matrix along the surface of the bottom plate 14a of the chassis 14 so as to form a row direction (X-axis direction) and a column direction (Y-axis direction).
  • form the row direction herein means a state in which a plurality of LEDs 17 are arranged along one direction (X-axis direction).
  • “form the column direction” is a state in which a plurality of LEDs 17 are arranged along a direction (Y-axis direction) intersecting one direction (X-axis direction) described above.
  • “a plurality of LEDs 17 are arranged along one direction” is not limited to a state in which all the LEDs 17 are on the same straight line, and a line connecting the arranged LEDs 17 forms a non-linear shape. Also included are configurations. The arrangement of the LEDs 17 will be described in detail later.
  • a total of 27 LED units U are arranged in parallel in the chassis 14, three in the X-axis direction and nine in the Y-axis direction.
  • the LED boards 18 arranged along the X-axis direction are electrically connected to each other by fitting and connecting adjacent connector portions 18a to each other at both ends of the chassis 14 in the X-axis direction.
  • the corresponding connector portion 18a is electrically connected to an external control circuit (not shown).
  • the LEDs 17 arranged on the LED boards 18 in one row are connected in series, and the lighting / extinction of a large number of LEDs 17 included in the row is collectively controlled by a single control circuit. Therefore, it is possible to reduce the cost.
  • Each LED board 18 described above is fixed to the bottom plate 14a of the chassis 14 by a holding member 20, as shown in FIG.
  • the holding member 20 includes a disc-shaped presser portion 20a and a locking portion 20b that protrudes downward from the presser portion 20a.
  • the LED board 18 is provided with an insertion hole 18c for inserting the locking portion 20b, and the bottom plate 14a of the chassis 14 is provided with an attachment hole communicating with the insertion hole 18c.
  • the distal end portion of the locking portion 20b of the holding member 20 is a wide portion that can be elastically deformed, and can be locked to the back side of the bottom plate 14a of the chassis 14 after being inserted through the insertion hole 18c and the mounting hole of the bottom plate 14a. It has become. Thereby, the holding member 20 can fix the LED substrate 18 to the bottom plate 14a while pressing the LED substrate 18 with the holding portion 20a.
  • a support pin 27 protrudes from the surface of the holding member 20 ⁇ / b> B located near the center of the bottom plate 14 a of the chassis 14 in the holding member 20.
  • the support pin 27 is tapered toward the front side and has a conical shape with a rounded tip.
  • the diffuser plate 15a is bent downward, the diffuser plate 15a and the tip of the support pin 27 come into point contact so that the diffuser plate 15a can be supported from below. Therefore, it is possible to suppress luminance unevenness due to the bending of the lens.
  • symbol 20A is attached
  • the chassis reflection sheet 22 is set to a size that covers the entire inner surface of the chassis 14.
  • the chassis reflection sheet 22 is made of, for example, a synthetic resin, and has a white surface with excellent light reflectivity. As shown in FIG. 3, the chassis reflection sheet 22 extends along the inner surface of the chassis 14, and most of the center reflection sheet 22 extends along the bottom plate 14 a of the chassis 14. It is said.
  • the sheet bottom 31 has a substantially rectangular shape in plan view.
  • the sheet bottom 31 is formed with a lens insertion hole 22b through which the above-described diffusion lens 19 can be passed.
  • a plurality of lens insertion holes 22b are arranged in parallel at positions corresponding to the diffusion lens 19 (that is, arranged in a matrix).
  • the lens insertion hole 22 b has a circular shape in plan view corresponding to the shape of the diffusion lens 19, and the diameter dimension R ⁇ b> 1 is set larger than the diameter dimension R ⁇ b> 2 of the diffusion lens 19.
  • each diffusion lens 19 can be surely passed through each lens insertion hole 22 b regardless of the presence or absence of dimensional errors.
  • the chassis reflection sheet 22 covers the area between the adjacent diffusion lenses 19 and the outer peripheral area in the chassis 14, so that light directed to these areas is directed to the optical member 15 side. Can be reflected.
  • an inclined seat inclined portion 32 is extended from the peripheral edge (around four sides) of the seat bottom 31.
  • Each sheet inclined portion 32 rises so as to cover the side plate 14c of the chassis 14 (FIGS. 4 and 5).
  • the mounting part 33 is extended along the receiving plate 14d, and this mounting part 33 is mounted in the receiving plate 14d.
  • the optical member 15 is supported by the placement portion 33. That is, the mounting portion 33 is sandwiched between the chassis 14 and the optical member 15.
  • the LEDs 17 are arranged in a substantially matrix form in plan view (FIG. 3).
  • the LED 17 is arranged at the center of the diffusion lens 19 in plan view as described above.
  • the LED 17 is schematically illustrated in that it is arranged at the center of the diffusion lens 19.
  • a group of LEDs 17 (hereinafter referred to as light source group 50) arranged along the X-axis direction (row direction) has a plurality of columns (in this embodiment, in the Y-axis direction (column direction)). 9 columns) are arranged in parallel.
  • the light source group 50 includes a central light source group 51 disposed on the center side of the bottom plate 14a in the Y-axis direction (column direction), and an end side (upper and lower sides in FIG. 3) than the central light source group 51. And an end-side light source group 52 disposed on either one of the two sides.
  • the light source groups 50 at both ends in the Y-axis direction are illustrated.
  • the center side light source group 51 the light source group 50 arrange
  • the LED 17 (indicated by reference numeral 17A) arranged at the extreme right side (one end side) in FIG. 3 in the end side light source group 52 is the extreme end on the right side (one end side) in FIG. Is arranged on the outer side (right side in FIG. 3) of the bottom plate 14a in the X-axis direction (row direction) than the LED 17 (indicated by reference numeral 17B).
  • the LED 17A is arranged so as to be closer to the corner of the bottom plate 14a (more specifically, one corresponding corner of the four corners) in the X-axis direction than the LED 17B. Has been.
  • the LED 17 (denoted by reference numeral 17D) arranged at the extreme end on the left side (one end side) in FIG. 3 in the end side light source group 52 is the extreme end on the left side (one end side) in FIG. Is arranged on the outer side (left side in FIG. 3) of the bottom plate 14a in the X-axis direction (row direction) than the LED 17 (indicated by reference numeral 17E).
  • the LEDs 17A and 17D disposed at both ends of the end-side light source group 52 are more in the X-axis direction (row direction) of the bottom plate 14a than the LEDs 17B and 17E disposed at both ends of the center-side light source group 51. ) Are arranged on the outside. Such a configuration may be applied to only one of the LEDs 17A and 17D arranged at both ends.
  • the LED 17 at both ends is the same as the LED 17 at both ends in the center-side light source group 51 in the X-axis direction.
  • Each is located in the same position.
  • only the end-side light source group 52 is set so that the total length in the X-axis direction (the length from the LED 17 at one end to the LED 17 at the other end) is longer than the other light source groups 50.
  • the backlight device 12 of the present embodiment includes the plurality of LEDs 17 and the chassis 14 having the bottom plate 14a (bottom portion) having a planar view shape and accommodating the plurality of LEDs 17.
  • the plurality of LEDs 17 are arranged in a matrix form so as to form a row direction (X-axis direction) and a column direction (Y-axis direction) along the surface of the bottom plate 14a, and the plurality of LEDs 17 arranged along the X-axis direction.
  • the light source group 50 composed of the LEDs 17 includes a center side light source group 51 disposed on the center side of the bottom plate 14a and an end side light source group 52 disposed on the end side further than the bottom plate 14a in the Y-axis direction.
  • the LED 17 (for example, LED 17A) disposed at the end on one end side in the end side light source group 52 is more than the LED 17 (for example, LED 17B) disposed at the end on one end side in the central light source group 51.
  • bottom plate 14a Characterized in that it is arranged outside the X-axis direction (the row direction).
  • the arrangement density of the LEDs 17 is reduced at the corners of the bottom plate 14a compared to the central portion, and a dark portion is likely to occur.
  • a configuration in which the number of LEDs 17 at the corner of the bottom plate 14a is increased can be considered.
  • an increase in the number of LEDs 17 is not preferable because it increases component costs and power consumption.
  • the LED 17 disposed at the outermost end on the one end side in the end side light source group 52 is replaced with the LED 17 disposed at the outermost end on the one end side in the central light source group 51.
  • the bottom plate 14a is arranged outside the X axis direction (row direction). That is, the LEDs 17 ⁇ / b> A and 17 ⁇ / b> D (the LEDs 17 closer to the corners of the bottom plate 14 a) disposed at one end side in the end-side light source group 52 are disposed at the outermost end on one end side in the center-side light source group 51.
  • the LEDs 17B and 17E are arranged closer to each corner of the bottom plate 14a in the X-axis direction than the LEDs 17B and 17E. Thereby, it can suppress that the brightness
  • luminance fall of a corner is suppressed by adjusting arrangement
  • the LEDs 17A and 17D disposed at both ends of the end side light source group 52 are respectively disposed on the outer side in the X-axis direction of the bottom plate 14a than the LEDs 17B and 17E disposed at both ends of the center side light source group 51. Yes. With such a configuration, it is possible to suppress a decrease in luminance at each corner (the corner closest to each LED 17A, 17D) corresponding to the LEDs 17A, 17D at both ends in the end-side light source group 52.
  • the light source groups 50 are arranged in at least three rows (9 rows in the present embodiment) in the Y-axis direction, and the light source groups 50 at both ends in the Y-axis direction are the end-side light source groups 52, respectively. With such a configuration, in the light source group 50 at both ends in the Y-axis direction, it is possible to suppress a decrease in luminance at each corner corresponding to the LEDs 17A and 17D arranged at the extreme ends on the one end side.
  • a diffusion lens 19 capable of diffusing light from the LED 17 is disposed on the light emitting side (front side) of the LED 17.
  • the luminance can be made uniform while increasing the arrangement interval between the LEDs 17 (that is, while reducing the number of LEDs).
  • the number of LEDs 17 and light source units U can be reduced and costs can be reduced as compared with the case where the diffusion lens 19 is not used.
  • an LED 17 (light emitting diode) is used as the light source. By using the LED 17, high brightness and low power consumption can be achieved.
  • Embodiment 2 of the present invention will be described with reference to FIG.
  • the same parts as those of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
  • the arrangement of the LEDs 17 is different from that of the above embodiment.
  • the LED 17 (indicated by reference numeral 217A) disposed at the extreme right side (one end side) of FIG. 7 in the end side light source group 252 is the right side (one end side) of FIG.
  • the LED 17 ⁇ / b> B disposed at the extreme end of the bottom plate 14 a is disposed outside the X-axis direction (row direction) in the bottom plate 14 a.
  • the LEDs 217A are arranged on the outer side (upper side or lower side in FIG. 7) of the bottom plate 14a in the Y-axis direction than the adjacent LEDs 17 (labeled with 17F) in the end side light source group 252.
  • the LED 17 (denoted by reference numeral 217D) disposed at the extreme end on the left side (one end side) in FIG. 7 in the end side light source group 252 is the extreme end on the left side (one end side) in FIG.
  • the LED 17E is arranged on the outer side in the X-axis direction (row direction) of the bottom plate 14a.
  • the LED 217D is arranged on the outer side in the Y-axis direction (upper side or lower side in FIG. 7) of the bottom plate 14a than the adjacent LEDs 17 (labeled 17G) in the end side light source group 252.
  • the edge part side light source group 252 is a group of LED17 distribute
  • LED substrates 218 set with a shorter length than the other LED substrates 18 are arranged as substrates for mounting the above-described LEDs 217A and 217D, respectively.
  • LED board 218 it is not limited to the structure provided with LED board 218, For example, it is good also as a structure which extends a part of LED board 18 and mounts LED217A, 217D in the extension part, respectively.
  • the LEDs 217A and 217D arranged at both ends of the end-side light source group 252 are compared with the LEDs 17A and 17D of the first embodiment at the corresponding corners of the bottom plate 14a. They can be arranged close to each other, and the luminance reduction at the corners can be more effectively suppressed.
  • Embodiment 3 of the present invention will be described with reference to FIG.
  • the same parts as those in each of the above embodiments are given the same reference numerals and redundant description is omitted.
  • the arrangement of the LEDs 17 is different from those of the above embodiments.
  • the LED 17 arranged at the outermost end on one end side in the X-axis direction in each light source group 50 is configured to be arranged on the outer side in the X-axis direction toward the end in the Y-axis direction (outside of the bottom plate 14a). Yes.
  • an end side light source group 352 (first end side light source group) arranged on the end side in the Y axis direction of the bottom plate 14a
  • An end-side light source group 353 (second end-side light source group) arranged on the center side of the bottom plate 14a by one row from the end-side light source group 352 will be described as an example.
  • the LED 17 (denoted by reference numeral 317A) arranged at the right end (one end side) in FIG. 8 in the end side light source group 352 is at the right end (one end side) in FIG. It is arranged on the outer side (right side in FIG. 8) of the bottom plate 14a in the X-axis direction (row direction) than the arranged LED 17 (denoted by reference numeral 317C).
  • the LED 17 (denoted by reference numeral 317D) disposed at the outermost end on the left side (one end side) in FIG. 8 in the end side light source group 352 is the outermost LED on the left side (one end side) in FIG. It is arranged on the outer side (left side in FIG. 8) of the bottom plate 14a in the X-axis direction (row direction) than the LED 17 (reference numeral 317F) arranged at the end.
  • the LEDs 17 can be arranged close to the corners of the bottom plate 14a as in the above embodiments.
  • the end-side light source groups 52, 252, 352, and 353 and the center-side light source group 51 exemplified in the above embodiment are merely examples, and are not limited thereto.
  • all of the light source groups 50 disposed relatively on the end side can be applied as the end side light source group, and the light sources disposed on the center side of the end side light source group. All the groups 50 can be applied as a central light source group.
  • the light source groups 50 on both ends in the Y-axis direction are the end-side light sources 52, 252, 352, and 353, respectively, but only the light source group 50 on one end in the Y-axis direction. May be used as the end side light source group.
  • the LED 17 is exemplified as the light source, but the present invention is not limited to this, and a light source other than the LED can be applied.
  • the LED substrate 18 has a configuration in which the long side direction is arranged along the X-axis direction, but is not limited thereto.
  • the long side direction of the LED substrate 18 may be arranged along the Y-axis direction.
  • the TFT is used as the switching element of the 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)), and color display.
  • a switching element other than TFT for example, a thin film diode (TFD)
  • color display for example, a liquid crystal display device.
  • the present invention can be applied to a liquid crystal display device that displays black and white.
  • the 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 has been exemplified.
  • the present invention can also be applied 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, 212, 312 ... Backlight device (illumination device), 14 ... Chassis, 14a ... Bottom plate (bottom part), 17 ... LED (light source) , 17A, 17D, 217A, 217D... LED (light source arranged at the outermost end of one end (or both ends) in the end side light source group), 17B... LED (one end side (or both ends) in the central light source group) 17F, 17G... LED (light source adjacent to the end side light source group), 19... Diffuser lens, 50... Light source group, 51 .. center side light source group, 52, 252.

Abstract

L'invention concerne un dispositif d'éclairage qui permet de minimiser les irrégularités de luminosité. Ledit dispositif d'éclairage comprend une pluralité de DEL (17) et un châssis (14) contenant les DEL (17). Le châssis comprend une plaque inférieure (14a) qui forme un rectangle dans une vue en plan. Les DEL (17) sont disposées en réseau sur la surface de la plaque inférieure (14a) en rangées et en colonnes. Des groupes de sources de lumière (50) comprenant des rangées de DEL (17) comprennent un groupe de sources de lumière central (51) qui est disposé au centre de la plaque inférieure (14a) dans le sens des colonnes, et des groupes de sources de lumière latéraux (52) qui sont disposés sur les côtés du groupe de sources de lumière central. Des DEL (17A) disposées tout au long d'une extrémité des groupes de sources de lumière latéraux (52) sont disposées plus vers l'extérieur sur la plaque inférieure (14a) dans le sens des rangées qu'une DEL (17B) disposée tout au long d'une extrémité du groupe de sources de lumière central (51).
PCT/JP2010/069166 2009-12-08 2010-10-28 Dispositif d'éclairage, dispositif d'affichage, et dispositif de réception de télévision WO2011070872A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP10835794.8A EP2511590A4 (fr) 2009-12-08 2010-10-28 Dispositif d'éclairage, dispositif d'affichage, et dispositif de réception de télévision
JP2011545147A JP5337883B2 (ja) 2009-12-08 2010-10-28 照明装置、表示装置、及びテレビ受信装置
CN201080055722.7A CN102667312B (zh) 2009-12-08 2010-10-28 照明装置、显示装置以及电视接收装置
US13/512,353 US20120236213A1 (en) 2009-12-08 2010-10-28 Lighting device, display device and television receiver

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009278612 2009-12-08
JP2009-278612 2009-12-08

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WO2011070872A1 true WO2011070872A1 (fr) 2011-06-16

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US (1) US20120236213A1 (fr)
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JP2015118812A (ja) * 2013-12-18 2015-06-25 岩崎電気株式会社 発光素子モジュール及び照明器具
JP2015181133A (ja) * 2015-07-07 2015-10-15 岩崎電気株式会社 発光素子モジュール及び照明器具
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JP2022031370A (ja) * 2017-12-25 2022-02-18 日亜化学工業株式会社 発光装置及び発光モジュール

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JP2013152865A (ja) * 2012-01-25 2013-08-08 Sharp Corp 照明装置およびそれを備えた表示装置
JP2014219649A (ja) * 2013-04-09 2014-11-20 船井電機株式会社 表示装置
CN106504695B (zh) * 2016-12-15 2019-03-01 深圳市奥拓立翔光电科技有限公司 一种可弯曲的led显示屏局部亮度调整的控制方法
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JP2013152863A (ja) * 2012-01-25 2013-08-08 Sharp Corp 照明装置およびそれを備えた表示装置
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JP7227531B2 (ja) 2017-12-25 2023-02-22 日亜化学工業株式会社 発光装置及び発光モジュール

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CN102667312B (zh) 2014-10-15
EP2511590A1 (fr) 2012-10-17
US20120236213A1 (en) 2012-09-20
JPWO2011070872A1 (ja) 2013-04-22
EP2511590A4 (fr) 2014-03-26
JP5337883B2 (ja) 2013-11-06
CN102667312A (zh) 2012-09-12

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