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WO2012014600A1 - 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
WO2012014600A1
WO2012014600A1 PCT/JP2011/064053 JP2011064053W WO2012014600A1 WO 2012014600 A1 WO2012014600 A1 WO 2012014600A1 JP 2011064053 W JP2011064053 W JP 2011064053W WO 2012014600 A1 WO2012014600 A1 WO 2012014600A1
Authority
WO
WIPO (PCT)
Prior art keywords
light source
led light
light sources
lens
lens sheet
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2011/064053
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English (en)
Japanese (ja)
Inventor
香織 生田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Publication of WO2012014600A1 publication Critical patent/WO2012014600A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
    • 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

Definitions

  • the present invention relates to a lighting device, a display device, and a television receiver.
  • liquid crystal display device requires a backlight device as a separate illumination device because the liquid crystal panel used for this does not emit light.
  • a direct-type backlight device that directly supplies light from the back surface to a liquid crystal panel is known.
  • a reflection member may be disposed on an installation surface on which a light source such as an LED is installed.
  • Patent Document 1 discloses a reflective member that is used in a direct backlight device or the like and has a three-dimensional shape having a plurality of inclined surfaces that are inclined from the LED installation surface toward the liquid crystal panel. .
  • a reflective member that is used in a direct backlight device or the like and has a three-dimensional shape having a plurality of inclined surfaces that are inclined from the LED installation surface toward the liquid crystal panel.
  • An object of the present invention is to provide a technique capable of preventing or suppressing unevenness in luminance of a display surface without increasing the number of light sources in a direct-type illumination device including a reflective member that directs light on the display surface.
  • the technology disclosed in this specification 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 the light source is accommodated and directed toward the light emitting side. And a reflecting member that has a plurality of inclined surfaces inclined from the installation surface of the light source toward the opening side of the chassis, and directs light from the light source toward the opening side by the inclined surface.
  • a first lens member arranged on the opening side of the chassis and having a plurality of lenses arranged in parallel along a direction parallel to the light source installation surface; and a side of the first lens member facing the light source And a second lens member provided with a plurality of lenses arranged in parallel with each other in a direction parallel to the installation surface of the light source and perpendicular to the parallel direction of the lenses of the first lens member And a lighting device comprising That.
  • the light directed to the opening side of the chassis by the reflecting member is transmitted through the first lens member and the second lens member, so that the light is multiplexed in the first lens member and the second lens member. Can be reflected and scattered. Thereby, a uniform luminance distribution can be formed on the light emitting side of the light source. For this reason, in a direct illumination device including a reflective member that directs light on the display surface, luminance unevenness on the display surface can be prevented or suppressed without increasing the number of light sources.
  • the first lens member may be a diffuser plate having a lens shape
  • the second lens member may be a lens sheet. According to this configuration, it is possible to effectively form a uniform luminance distribution on the light emission side of the light source by transmitting the light through the diffusion plate and the lens sheet.
  • the lens sheet may be a prism lens sheet, a micro lens sheet, or a lenticular lens sheet. According to this configuration, a uniform luminance distribution can be effectively formed on the light emission side of the light source by transmitting the light from the light source to either the prism lens sheet, the micro lens sheet, or the lenticular lens sheet.
  • the second lens member may be laminated on the first lens member so as to cover the entire surface of the first lens member opposite to the side facing the light source. According to this configuration, since all the light transmitted through the first lens member can be transmitted through the second lens member, luminance unevenness on the display surface can be further prevented or suppressed.
  • the reflective member may be shaped to individually surround the light sources. According to this configuration, since the light from each light source can be effectively directed to the display surface side by the reflecting member, luminance unevenness on the display surface can be further prevented or suppressed.
  • the reflection member may have a constant inclination angle of the plurality of inclined surfaces. According to this configuration, the direction in which light is directed can be made constant on each inclined surface, and a uniform luminance distribution can be formed on the light emission side of the light source.
  • the interval between adjacent light sources may be constant. According to this configuration, a uniform luminance distribution can be formed on the light emission side of the light source.
  • the interval between the adjacent light sources may not be constant, and the inclination angles of the plurality of inclined surfaces of the reflecting member may be adjusted according to the interval between the adjacent light sources. According to this configuration, even when the interval between the light sources is not constant, a uniform luminance distribution can be formed on the light emission side of the light source. Therefore, the number of light sources can be reduced while preventing or suppressing luminance unevenness on the display surface, and the mounting cost of the light sources, the power consumption of the lighting device, and the like can be reduced.
  • the technology disclosed in this specification can also be expressed as a display device including a display panel that performs display using light from the above-described lighting device.
  • a display device in which the display panel is a liquid crystal panel using liquid crystal is also new and useful.
  • a television receiver provided with the above display device is also new and useful. According to the display device and the television set described above, the display area can be increased.
  • FIG. 1 is an exploded perspective view of a television receiver TV according to Embodiment 1.
  • FIG. An exploded perspective view of the liquid crystal display device 10 is shown.
  • the top view of the backlight apparatus 24 is shown.
  • a cross-sectional view of the backlight device 24 is shown.
  • a cross-sectional view of the backlight device 24 is shown.
  • a perspective view of the lens sheet 19 is shown.
  • a normal direct type backlight device provided with a reflecting member 26 the luminance distribution on the display surface of the liquid crystal panel when two LED light sources are arranged in parallel in the X-axis direction is shown.
  • the backlight device 24 according to Embodiment 1 the luminance distribution on the display surface of the liquid crystal panel 16 when two LED light sources 28 are arranged in parallel in the X-axis direction is shown.
  • the top view of the backlight apparatus 124 which concerns on Embodiment 2 is shown.
  • a perspective view of lens sheet 119 is shown.
  • the perspective view of the lens sheet 219 which concerns on Embodiment 3 is shown.
  • the top view of the backlight apparatus 324 which concerns on Embodiment 4 is shown.
  • the top view of the backlight apparatus 424 which concerns on Embodiment 5 is shown.
  • the top view of the backlight apparatus 524 which concerns on Embodiment 6 is shown.
  • Embodiment 1 will be described with reference to the drawings.
  • a part of each drawing shows an X-axis, a Y-axis, and a Z-axis, and each axis direction is drawn in a common direction in each drawing.
  • the Y-axis direction coincides with the vertical direction
  • the X-axis direction coincides with the horizontal direction.
  • FIG. 1 is an exploded perspective view of the television receiver TV according to the first embodiment.
  • 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. I have.
  • the liquid crystal display device 10 has a horizontally long rectangular shape as a whole and is accommodated in a vertically placed state.
  • FIG. 2 is an exploded perspective view of the liquid crystal display device 10.
  • the upper side shown in FIG. 2 is the front side, and the lower side is the back side.
  • the liquid crystal display device 10 includes a liquid crystal panel 16 that is a display panel and a backlight device 24 that is an external light source, and these are integrally held by a bezel 12 or the like having a frame shape. It is like that.
  • the liquid crystal panel 16 has a configuration in which a pair of transparent (highly translucent) glass substrates are bonded together with a predetermined gap therebetween, and a liquid crystal layer (not shown) is sealed between the glass substrates. Is done.
  • 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.
  • 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.
  • image data and various control signals necessary for displaying an image are supplied to a source wiring, a gate wiring, a counter electrode, and the like from a drive circuit board (not shown).
  • a polarizing plate (not shown) is disposed outside both glass substrates.
  • FIG. 3 shows a plan view of the backlight device 24.
  • FIG. 4 shows a cross-sectional view of a cross section of the backlight device 24 cut in the horizontal direction (X-axis direction).
  • FIG. 5 shows a cross-sectional view of a cross section of the backlight device 24 cut in the vertical direction (Y-axis direction).
  • the backlight device 24 includes a chassis 22, a shaped diffusion plate 20, a lens sheet 19, an optical member 18, and a frame 14.
  • the chassis 22 has a substantially box shape opened to the front side (light emitting side, liquid crystal panel 16 side).
  • the shaped diffusion plate 20 is arranged on the front side of the chassis 22 so as to cover the opening of the chassis 22.
  • the lens sheet 19 is disposed on the front side of the shaped diffusion plate 20.
  • the optical member 18 is disposed on the front side of the lens sheet 19.
  • the frame 14 has a frame shape and supports the liquid crystal panel 16 along the inner edge.
  • an LED substrate 30 (see FIGS. 4 and 5) on which a plurality of point-like LED (Light-Emitting-Diode) light sources 28 are arranged and a reflecting member 26 are accommodated.
  • the shaped diffusion plate 20 side is the light emitting side rather than the LED substrate 30 side, and light is directly supplied to the liquid crystal panel 16 from the back side through the shaped diffusion plate 20 and the like. This is a direct type backlight device.
  • the chassis 22 is made of, for example, a metal such as an aluminum-based material, and includes a bottom plate 22a, a side plate 22c, and a receiving plate 22d. As a whole, the chassis 22 is a shallow substantially box-shaped (substantially shallow dish) that opens toward the front side. Is made.
  • the bottom plate 22 a has a horizontally long rectangular shape as in the liquid crystal panel 16, and is disposed on the back side of the LED substrate 30, that is, on the side opposite to the light emitting side of the LED light source 28.
  • the side plate 22c rises from the outer edge of each side of the bottom plate 22a.
  • the receiving plate 22d projects outward from the rising end of each side plate 22c, and the shaped diffusion plate 20 and the frame 14 can be placed on the front side.
  • the frame 14 is fixed to the receiving plate 22d by being screwed to the receiving plate 22d.
  • the long side direction of the chassis 22 coincides with the X-axis direction (horizontal direction), and the short side direction thereof coincides with the Y-axis direction (vertical direction).
  • the LED substrate 30 and the LED light source 28 disposed on the surface of the LED substrate 30 will be described. 4 and 5, the LED substrate 30 has a horizontally long flat plate shape similar to the bottom plate 22a of the chassis 22, the long side direction coincides with the X-axis direction, and the short side direction is the Y-axis direction. Is laid on the front side of the bottom plate 22 a of the chassis 22.
  • the LED substrate 30 has a size that can cover the entire area of the bottom plate 22a, specifically, a size that can cover most of the center side excluding the outer peripheral end of the bottom plate 22a. .
  • the LED light source 28 is mounted on the surface 30 a of the LED substrate 30. As shown in FIG. 3, the LED light sources 28 are arranged in parallel on the LED substrate 30 in a plurality of planes in the X-axis direction and the Y-axis direction. The arrangement pitch of the LED light sources 28 arranged in parallel along the X-axis direction and the arrangement pitch of the LED light sources 28 arranged in parallel along the Y-axis direction are fixed. The LED light sources 28 are connected to each other by a wiring pattern (not shown) formed on the LED substrate 30. Driving power is supplied to the LED light source 28 by a power supply circuit board (not shown) attached to the back side of the bottom plate 22 a of the chassis 22.
  • the LED light source 28 emits white light.
  • three types of LED chips (not shown) of red, green, and blue may be surface-mounted, or the blue light emitting element emits light in a yellow region. It may be one that emits white light by applying a phosphor having a peak.
  • the blue light emitting element may emit white light by applying a phosphor having emission peaks in the green and red regions.
  • a phosphor having a light emission peak in a green region may be applied to a blue light emitting element, and white light may be emitted by combining a red light emitting element.
  • the LED light source 28 may emit white light by combining a blue light emitting element, a green light emitting element, and a red light emitting element.
  • a combination of an ultraviolet light emitting element and a phosphor may be used.
  • an ultraviolet light-emitting element may emit white light by applying a phosphor having emission peaks in blue, green, and red, respectively.
  • the LED light source 28 has a light distribution such that light having a peak emission intensity is directed in a direction inclined with respect to the front direction.
  • the specific unit of emission intensity can be radiant intensity (W / sr ⁇ m2), radiant flux (W), irradiance (W / m2), etc. It is also possible to do.
  • the light emission surface of each LED light source 28 has a hemispherical shape, and light whose emission intensity reaches a peak is emitted radially from the center of the LED light source 28 and travels in a direction that forms a predetermined angle with respect to the front direction. It is said that. For this reason, the light emitted from the LED light source 28 is diffused over a wide range.
  • the reflection member 26 is made of a synthetic resin material having thermoplasticity, and the surface thereof has a white color with excellent light reflectivity.
  • the reflection member 26 is laid on the front side of the LED board 30 laid on the surface of the chassis 22 and has a size that can cover the LED board 30 over almost the entire area.
  • the reflecting member 26 extends along the LED substrate 30 and includes four rising portions 26c and four extending portions 26e as shown in FIGS.
  • the rising portions 26 c rise from the outer peripheral end of the bottom portion of the reflecting member 26 and have a shape that is inclined with respect to the bottom plate 22 a of the chassis 22.
  • the extending portion 26 e extends outward from the outer end of each rising portion 26 c and is placed on the receiving plate 22 d of the chassis 22.
  • a plurality of light source insertion holes 26d through which the LED light sources 28 are individually inserted are provided on the bottom portion of the reflection member 26 at positions overlapping the LED light sources 28 in plan view.
  • the light source insertion holes 26d are arranged in parallel in the X-axis direction and the Y-axis direction corresponding to the arrangement of the LED light sources 28.
  • the reflecting member 26 is provided with a plurality of inclined surfaces 26a that are inclined from the LED substrate 30 side to the front side (side where the chassis 22 is opened).
  • the inclination angle of each inclined surface 26a is fixed.
  • the inclined surface 26 a is formed by projecting most of the light source insertion holes 26 d excluding the hole edge to the front side, and the remaining portion of the bottom of the reflecting member 26 is supported by the LED substrate 30.
  • the inclined surface 26a is made into the circular-arc-shaped curved surface about the circumferential direction, and is formed so that each LED light source 28 may be enclosed individually in an inverted cone shape.
  • the inclined surface 26a can direct light emitted from each LED light source 28 and reaching the inclined surface 26a to the front side (shaped diffusion plate 20 side).
  • each inclined surface 26 a is connected via a top surface portion 26 b parallel to the surface of the LED substrate 30.
  • the inclined surface 26a has a protruding dimension such that a predetermined gap S is retained between the protruding tip and the shaped diffusion plate 20, and is not in contact with the shaped diffusion plate 20. Yes. In the gap S, the light emitted from the LED light source 28 surrounded by the inclined surface 26a and the light emitted from the LED light source 28 adjacent to the LED light source 28 are allowed to cross each other.
  • the shaped diffusion plate 20 is placed on the chassis receiving plate 22d via the extending portion 26e of the reflecting member 26 so as to be parallel to the LED substrate 30, and covers the opening side of the chassis 22.
  • the shaped diffusion plate 20 has a structure in which a large number of diffusion particles are dispersed in a substantially transparent resin base material having a predetermined thickness, and has a function of diffusing transmitted light.
  • a lens shape is formed on the front side surface of the shaped diffusion plate 20.
  • the front side surface of the shaped diffusing plate 20 is formed with a plurality of lenses that are arranged in parallel along the X-axis direction and form a prism lens shape whose cylinder axis extends along the Y-axis direction. ing.
  • FIG. 6 shows a perspective view of the lens sheet 19.
  • the lens sheet 19 covers the entire surface of the shaped diffusion plate 20 and is laminated on the front side of the shaped diffusion plate 20 so as to be parallel to the LED substrate 30.
  • the lens sheet 30 has a lens shape on the surface, and has a function of diffusing transmitted light.
  • a plurality of lenses 19 a that are arranged in parallel on the surface of the lens sheet 19 along the Y-axis direction and have a prism lens shape whose tube axis extends along the X-axis direction. Is formed.
  • the plurality of lenses 19 a formed on the lens sheet 19 b are arranged in parallel in a direction orthogonal to the direction in which the plurality of lenses shaped on the shaped diffusion plate 20 are arranged in parallel.
  • the light transmitted through the shaped diffusion plate 20 and the lens sheet 19 has a wide light-emitting surface of the lens sheet 19. It is emitted from the range.
  • the optical member 18 covers almost the entire surface of the lens sheet 19 and is disposed on the front side of the lens sheet 19.
  • a liquid crystal panel 16 is installed on the front side of the optical member 18, and the optical member 18 is disposed between the lens sheet 19 and the liquid crystal panel 16.
  • the optical member 18 is configured by laminating two sheets, and gives a predetermined optical action to the light emitted from the LED light source 28 and transmitted through the shaped diffusion plate 20 and the lens sheet 19. It is possible to emit light to the outside on the front side. Examples of these two sheets include a diffusion sheet, a lens sheet, a reflective polarizing sheet, and the like, which can be appropriately selected and used.
  • each LED light source 28 of the backlight device 24 When each LED light source 28 of the backlight device 24 is turned on, light emitted from each LED light source 28 in a wide range is reflected directly on the shaped diffusion plate 20 or on the inclined surface 26 a of the reflecting member 26. Incident indirectly.
  • the light transmitted through the shaped diffusion plate 20 is diffused by the shaped diffusion plate 20, is emitted from the front side, and enters the lens sheet 19.
  • the light incident on the lens sheet 19 is further diffused by the lens sheet 19, is emitted from the front side, and enters the optical member 18.
  • the light transmitted through the optical member 18 is emitted toward the liquid crystal panel 16.
  • FIG. 7 shows a normal direct type backlight device including the reflecting member 26 (in other words, in the backlight device 24 according to this embodiment, the LED light source 28, the shaped diffusion plate 20, and the lens sheet 19 are not applied). ) Shows the luminance distribution on the display surface of the liquid crystal panel when two LED light sources are arranged in parallel in the X-axis direction.
  • FIG. 7 shows a normal direct type backlight device including the reflecting member 26 (in other words, in the backlight device 24 according to this embodiment, the LED light source 28, the shaped diffusion plate 20, and the lens sheet 19 are not applied).
  • the vertical axis indicates the light emission intensity (arbitrary unit)
  • the horizontal axis indicates the LED light source arrangement (arbitrary unit) in the X-axis direction.
  • the peak of the light emission intensity is substantially uniform along the X-axis direction. This is because light emitted from the LED light source 28 is diffused over a wide range, and the light is transmitted through the shaped diffusion plate 20 and the lens sheet 19 to be multiple-reflected within the shaped diffusion plate 20 and the lens sheet 19. It is shown that a substantially uniform luminance distribution is obtained on the display surface of the liquid crystal panel 16 by being scattered.
  • the backlight device 24 includes the LED light source 28 having a high diffusion light distribution, and the shaped diffusion plate 20 and the lens sheet 19 that are stacked so that the parallel directions of the lenses are orthogonal to each other.
  • luminance unevenness on the display surface of the liquid crystal panel 16 is prevented or suppressed.
  • the shaped diffuser plate is made to transmit the light directed to the opening side of the chassis 22 by the reflecting member 26 through the shaped diffuser plate 20 and the lens sheet 19. 20 and the lens sheet 19 can be scattered by multiple reflection. Thereby, a uniform luminance distribution can be formed on the light emission side of the LED light source 28. For this reason, in the direct type backlight device 24 having a reflective member for directing light on the display surface of the liquid crystal panel 16, luminance unevenness on the display surface of the liquid crystal panel 16 is prevented or suppressed without increasing the number of LED light sources 28. can do.
  • the LED light source 28 when the LED light source 28, the shaped diffusion plate 20, and the lens sheet 19 having a high diffusion light distribution are not applied, when the backlight device is thinned, the LED light source Unless the number is increased, luminance unevenness on the display surface cannot be prevented or suppressed.
  • the backlight device 24 according to the present embodiment since the luminance unevenness of the display surface can be prevented or suppressed without increasing the number of LED light sources, the mounting cost of the LED light sources is reduced as compared with the case where the number of LED light sources is increased. In addition, power consumption by the LED light source can be reduced.
  • the backlight device 24 according to the present embodiment, light is transmitted through the shaped diffusion plate 20 and the lens sheet 19. For this reason, a uniform luminance distribution can be effectively formed on the light emitting side of the LED light source 28.
  • the lens sheet 19 is a prism lens sheet. For this reason, it is possible to effectively form a uniform luminance distribution on the light emitting side of the LED light source 28 by transmitting light through the lens sheet 19.
  • the lens sheet 19 is laminated on the shaped diffusion plate 20 so as to cover the entire surface of the shaped diffusion plate 20. For this reason, all the light which permeate
  • the reflecting member 26 is shaped so as to individually surround the LED light sources 28. For this reason, the light from each LED light source 28 can be effectively directed to the display surface side of the liquid crystal panel 16 by the reflecting member 26, and luminance unevenness on the display surface of the liquid crystal panel 16 can be further prevented or suppressed. it can.
  • the inclination angle of each inclined surface 26a of the reflecting member 26 is constant. For this reason, the direction in which light is directed can be made constant on each inclined surface 26a, and a uniform luminance distribution can be formed on the light emission side of the LED light source. Further, by making the inclination angle of each inclined surface 26a constant, the reflecting member 26 can be easily designed at the time of manufacture.
  • the interval between adjacent LED light sources is constant. For this reason, a uniform luminance distribution can be formed on the light emitting side of the LED light source 28.
  • the interval between the adjacent LED light sources 28 is made constant, it is possible to easily design the mounting of the LED light sources 28 on the LED substrate 30.
  • FIG. 9 is a plan view of the backlight device 124 according to the second embodiment.
  • FIG. 10 shows a perspective view of the lens sheet 119.
  • the shape of the reflecting member 126 and the shape of the lens 119a of the lens sheet 119 are different from those of the first embodiment. Since the other configuration is the same as that of the first embodiment, the description of the structure, operation, and effect is omitted.
  • the part obtained by adding the numeral 100 to the reference numerals in FIGS. 3 and 6 is the same as the part described in the first embodiment.
  • the inclined surface 126a of the reflecting member 126 is formed so as to individually surround each LED light source 128 in an inverted quadrangular pyramid shape, and its circumferential direction is entirely As a square shape. Therefore, each LED light source 128 is surrounded by four inclined surfaces 126a inclined from the LED substrate 130 side to the front side, and the inclination angle of each inclined surface 126a is constant. As described above, when the LED light sources 128 are formed so as to surround each inclined surface 126a of the reflecting member 126 in an inverted quadrangular pyramid shape, the LED light sources 128 are formed so as to be surrounded in an inverted cone shape (Embodiment). 1), the reflective member 126 can be made excellent in shape stability.
  • a plurality of lenses 119a are formed on the surface of the lens sheet 119 so as to be arranged in parallel along the Y-axis direction, and the cylindrical axis extends in the X-axis direction. Is formed. Even when the lens sheet 119 on which the lens 119a having such a shape is formed is applied, luminance unevenness on the display surface of the liquid crystal panel can be prevented or suppressed.
  • FIG. 11 is a perspective view of the lens sheet 119 according to the third embodiment.
  • the shape of the lens 219a of the lens sheet 219 is different from that of the first embodiment. Since the other configuration is the same as that of the first embodiment, the description of the structure, operation, and effect is omitted.
  • a plurality of microlenses 219 a are formed on the surface of the lens sheet 219.
  • Each microlens 219a has a hemispherical shape protruding to the front side of the lens sheet 219, and is arranged in parallel in the Y-axis direction with a certain interval in the X-axis direction. Even when the lens sheet 219 formed with such a microlens 219a is applied, the parallel direction of the lenses formed on the shaped diffusion plate located on the back side of the lens sheet 219 is along the X-axis direction. Therefore, the parallel direction of the lens is orthogonal between the shaped diffusion plate and the lens sheet 219.
  • the lens sheet 219 can have a condensing characteristic close to that of a lenticular lens. For this reason, luminance unevenness on the display surface of the liquid crystal panel can be prevented or suppressed.
  • FIG. 12 is a plan view of the backlight device 324 according to the fourth embodiment.
  • the fourth embodiment is different from that of the first embodiment in that the distance between the LED light sources 328 and the inclination angles of the inclined surfaces 326a1, 326a2, 326a3 of the reflecting member 326 are not constant. Since the other configuration is the same as that of the first embodiment, the description of the structure, operation, and effect is omitted.
  • the part obtained by adding the numeral 200 to the reference sign in FIG. 3 is the same as the part described in the first embodiment.
  • the interval between the adjacent LED light sources 328 is not constant, and there are a portion where the interval is close and a portion where the interval is coarse. It is mixed. Further, the angles of the inclined surfaces 326a1, 326a2, and 326a3 of the reflecting member 326 are adjusted according to the interval between the adjacent LED light sources 328. Specifically, the LED light source 328 located at the center of the backlight device 324 has the roughest spacing between the adjacent LED light sources 328, and the inclined surface 326 a 3 of the reflecting member 326 that surrounds the LED light source 328. The inclination angle is the slowest.
  • the four LED light sources 328 located on both sides in the horizontal direction (X-axis direction) in the central portion of the backlight device 324 in the vertical direction (Y-axis direction) are slightly separated from the adjacent LED light sources 328, and the LEDs
  • the inclination angle of the inclined surface 326a2 of the reflecting member 326 surrounding the light source 328 is slightly gentle.
  • the eight LED light sources 328 located on both ends in the vertical direction of the backlight device 324 are closest to the adjacent LED light sources 328, and the inclined surfaces of the reflecting member 326 surrounding the LED light sources 328 are included.
  • the inclination angle of 326a1 is the steepest. In this case, as shown in FIG.
  • the number of LED light sources 328 is reduced as compared with the backlight device 24 according to the first embodiment. And even if it is a case where the space
  • a uniform luminance distribution can be formed on the light emitting side (shaped diffusing plate side) of the light source 328.
  • the number of LED light sources 328 can be reduced while preventing or suppressing luminance unevenness on the display surface of the liquid crystal panel, and the mounting cost of the LED light sources 328 and the power consumption of the backlight device 324 are reduced. Etc. can be further reduced.
  • FIG. 13 is a plan view of the backlight device 424 according to the fifth embodiment.
  • the distance between the LED light sources 428 and the inclination angles of the inclined surfaces 426a1 and 426a2 of the reflecting member 426 are different from those of the fourth embodiment. Since the other configuration is the same as that of the fourth embodiment, the description of the structure, operation, and effect is omitted.
  • the part obtained by adding the numeral 100 to the reference sign in FIG. 12 is the same as the part described in the fourth embodiment.
  • the nine LED light sources 428 located on the center side of the backlight device 424 have a close interval between adjacent LED light sources 428.
  • the inclined surface 426a1 of the reflecting member 426 surrounding the LED light source 428 is steep.
  • the interval between the adjacent LED light sources 428 is rough, and the inclined surface 426a2 of the reflecting member 426 surrounding these LED light sources 428 is provided. It is moderate.
  • the number of LED light sources 428 can be reduced while preventing or suppressing luminance unevenness on the display surface of the liquid crystal panel, and the mounting cost of the LED light sources 428 and the power consumption of the backlight device 424 can be reduced. Etc. can be further reduced.
  • FIG. 14 is a plan view of the backlight device 524 according to the sixth embodiment.
  • the sixth embodiment is different from the fourth embodiment in the distance between the LED light sources 528, the shape of the reflection member 526, and the inclination angles of the inclined surfaces 526a1 and 526a2. Since the other configuration is the same as that of the fourth embodiment, the description of the structure, operation, and effect is omitted.
  • a part obtained by adding the numeral 200 to the reference sign in FIG. 12 is the same as the part described in the fourth embodiment.
  • the inclined surface 526a of the reflecting member 526 individually surrounds each LED light source 528 in an inverted quadrangular pyramid shape, as in the reflecting member 226 of the second embodiment. As a whole, the circumferential direction forms a square shape.
  • the nine LED light sources 528 located on the center side of the backlight device 524 have a close interval between the adjacent LED light sources 528, and the reflecting member 526 surrounding the LED light sources 528.
  • the inclined surface 526a1 is steep.
  • the interval between the adjacent LED light sources 528 is rough, and the inclined surface 526a2 of the reflecting member 526 surrounding the LED light sources 528 is formed. It is moderate. Even with such a configuration, the number of LED light sources 528 can be reduced while preventing or suppressing luminance unevenness on the display surface of the liquid crystal panel, and the mounting cost of the LED light sources 528 and the power consumption of the backlight device 524 can be reduced. Etc. can be further reduced.
  • the LED light sources 28, 128, 328, 428, and 528 are examples of “light sources”.
  • the shaped diffusion plate 20 is an example of the “first lens member”.
  • the lens sheets 19, 119, 219 are examples of the “second lens member”.
  • the backlight devices 24, 124, 324, 424, and 524 are examples of “illumination devices”.
  • the shape of the lens formed on the shaped diffusion plate or the shape of the lens formed on the lens sheet can be changed as appropriate.
  • the shape of the lens member disposed on the opening side of the chassis can be changed as appropriate.
  • the shape and the like of the reflecting member can be appropriately changed.
  • a television receiver provided with a tuner has been exemplified.
  • the present invention can also be applied to a display device that does not include a tuner.
  • TV TV receiver, Ca, Cb: cabinet, T: tuner, S: stand
  • 10 liquid crystal display device, 12: bezel, 14: frame
  • 16 liquid crystal panel
  • 18 optical member, 19, 119, 219: Lens sheet
  • 20 Shaped diffusion plate, 22, 122, 322: Chassis, 24, 124, 324, 424, 524: Backlight device, 26, 126, 326, 426, 526: Reflecting member, 26a, 126a: Inclined Surface, 28, 128, 328, 428, 528: LED light source, 30: LED substrate

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

Afin de prévenir ou de supprimer la génération d'une luminosité inégale dans un dispositif d'éclairage, le dispositif de rétro-éclairage divulgué (24) est muni des éléments suivants : des sources lumineuses à LED (28), la lumière dans l'intensité d'émission de lumière maximale ayant une répartition de la lumière qui fait face à une direction qui est oblique par rapport à la direction frontale ; un châssis (22) qui abrite les sources lumineuses à LED (28), et qui est ouvert vers le côté d'émission de lumière des sources lumineuses à LED (28) ; un élément réfléchissant (26) qui comporte une pluralité de surfaces inclinées, et qui dirige la lumière des sources de lumière LED (28) vers le côté ouvert du châssis (22) par l'intermédiaire des surfaces inclinées ; une plaque de diffusion d'élargissement de taille (20), qui est agencée dans le côté ouvert du châssis (22), une pluralité de lentilles étant agencées en parallèle le long de la direction parallèle à la surface d'agencement des sources lumineuses à LED (28) ; et une feuille de lentilles (19), qui est agencée sur le côté de la plaque de diffusion d'élargissement de taille (20) opposé au côté qui fait face aux sources lumineuses à LED (28), et qui est pourvue d'une pluralité de lentilles qui sont en parallèle le long de la direction qui est orthogonale à la direction dans laquelle sont alignées les lentilles de la plaque de diffusion d'élargissement de taille (20), qui est la direction parallèle à la surface d'agencement des sources lumineuses à LED (28).
PCT/JP2011/064053 2010-07-30 2011-06-20 Dispositif d'éclairage, dispositif d'affichage et dispositif de réception de télévision Ceased WO2012014600A1 (fr)

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JP2010172386 2010-07-30
JP2010-172386 2010-07-30

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JP2021131942A (ja) * 2020-02-18 2021-09-09 シャープ株式会社 バックライト装置
CN111929948A (zh) * 2020-08-13 2020-11-13 Oppo（重庆）智能科技有限公司 背光模组、液晶显示面板及电子装置
US11526051B2 (en) 2021-04-16 2022-12-13 Apple Inc. Displays with direct-lit backlight units
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US12372828B2 (en) 2021-04-16 2025-07-29 Apple Inc. Displays with direct-lit backlight units
US11513392B1 (en) 2021-09-23 2022-11-29 Apple Inc. Direct-lit backlight units with optical films
US11719978B2 (en) 2021-09-23 2023-08-08 Apple Inc. Direct-lit backlight units with light-emitting diodes
US11874559B2 (en) 2021-09-23 2024-01-16 Apple Inc. Display modules with direct-lit backlight units
US12197078B2 (en) 2021-09-23 2025-01-14 Apple Inc. Display modules with direct-lit backlight units

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