WO2013065116A1 - Dispositif d'éclairage par l'arrière et dispositif d'affichage à cristaux liquides l'utilisant - Google Patents

Dispositif d'éclairage par l'arrière et dispositif d'affichage à cristaux liquides l'utilisant Download PDF

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Publication number
WO2013065116A1
WO2013065116A1 PCT/JP2011/075112 JP2011075112W WO2013065116A1 WO 2013065116 A1 WO2013065116 A1 WO 2013065116A1 JP 2011075112 W JP2011075112 W JP 2011075112W WO 2013065116 A1 WO2013065116 A1 WO 2013065116A1
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Prior art keywords
led
backlight
light
backlight device
liquid crystal
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PCT/JP2011/075112
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English (en)
Japanese (ja)
Inventor
久保田　秀直
西中　祐三
直幸 鈴木
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日立コンシューマエレクトロニクス株式会社
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Priority to PCT/JP2011/075112 priority Critical patent/WO2013065116A1/fr
Publication of WO2013065116A1 publication Critical patent/WO2013065116A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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

Definitions

  • the present invention relates to a backlight device and a liquid crystal display device using the same, and more particularly, to a backlight device using a side view type LED (Light Emitting Diode) as a light source and a liquid crystal display device using the same.
  • a side view type LED Light Emitting Diode
  • a backlight device is arranged on the back of the liquid crystal display panel.
  • a backlight device used for a liquid crystal display device having a relatively large screen such as a television display device
  • a fluorescent tube has been used as a light source (see Patent Document 1).
  • Patent Document 1 discloses an edge light type (side view type) backlight device and an invention in which the backlight device is applied to a liquid crystal display device having a liquid crystal panel 10.
  • a light guide plate disposed so as to overlap the liquid crystal panel, a fluorescent tube as a light source disposed on a side portion of the light guide plate, It has a condenser that collects the light from the fluorescent tube in a relatively small angle range and enters the light toward the light guide plate.
  • the fluorescent tube has a U-shaped reflector in its cross section having an internal reflection layer.
  • the light guide plate of Patent Document 1 is made of a transparent plate such as an acrylic resin.
  • a diffusion sheet is provided on one surface (hereinafter, the liquid crystal display panel side is referred to as an upper surface), and a diffusion reflection layer (reflection) is formed on the lower surface. Sheet) is provided.
  • the diffuse reflection layer is obtained by providing diffusion dots in a predetermined pattern on the lower surface of the light guide plate.
  • the diffusion dots have different areas depending on the distance from the light source of the light guide plate, thereby making it possible to obtain uniform brightness over the entire surface of the light guide plate as is well known.
  • Patent Document 1 a light guide plate, a condenser, a reflector, and the like are used, and the number of parts is large. For this reason, in the backlight device and the liquid crystal display device using the backlight device, the component cost is high. In addition, since a fluorescent tube is used, power consumption is large. In addition, the fluorescent tube has a heavy load on the global environment because mercury vapor is sealed inside. Therefore, the use tends to be prohibited in some areas such as Europe. Thus, in recent backlight devices, LEDs (Light Emitting Diodes) are being used as light sources instead of fluorescent tubes. Further, it has been studied to eliminate the light guide plate for guiding the light emitted from the side view type LED light source to the diffuser plate by totally reflecting and scattering the light.
  • LEDs Light Emitting Diodes
  • a backlight device used in a large-screen liquid crystal display device generally has a structure in which the backlight device is divided into a plurality of backlight blocks. And it is necessary to make light emitted from each LED in each backlight block uniformly reach within the backlight block.
  • FIG. 1 is a diagram showing the result of simulating the luminance distribution of light from the emitted light to the next LED.
  • FIG. 2 is a diagram showing the result of simulating the luminance distribution observed on the diffusion plate on the front surface of the backlight device.
  • FIG. 2 is a distribution diagram in which backlight blocks are indicated by contour lines of luminance values, and regions P1 and P2 are portions having the highest luminance values.
  • Reference numeral 210 denotes an emission direction of light from the LED light source. And it shows that the luminance value is lowered as the number of contour lines increases.
  • the region P1 is a place where the light emitted from the LED 7-1 is directly applied to the diffusion plate, and the region P2 is a place where the light emitted from the LED 7-2 is directly applied to the diffusion plate.
  • the peak value P1 of the luminance value is generated by the light emitted from the LED 7-1.
  • the luminance decreases as the distance from the LED 7-1 increases, and becomes the lowest luminance value L3 near the back of the next LED 7-2.
  • a dot-like pattern is formed by printing or the like so that the emitted light from the LEDs 7-1 and 7-2 is reduced in luminance unevenness.
  • An object of the present invention is to provide a backlight device and a liquid crystal display device with little luminance unevenness in view of the above problems.
  • a backlight device for irradiating light from an emission surface.
  • the backlight device includes a base chassis and a plurality of backlights on the base chassis.
  • Each of the backlight blocks is provided on the back side of the backlight block and on the base chassis, and is provided to face the reflection sheet.
  • a plate-like diffusion plate arranged at a predetermined distance from the reflecting member in a direction orthogonal to the light irradiation surface of the backlight, and the back arranged in a space between the diffusion plate and the reflection sheet.
  • a plurality of LEDs that emit light in the emission direction parallel to the light irradiation surface of the light unit, and the LEDs are mounted on the reflection sheet.
  • the LED board provided on the upper surface side of the reflecting sheet, and attached to the LED board, covering the upper side and both side surfaces of the LED, and configured to accommodate the LED together with the LED board
  • a backlight device characterized by comprising an LED cover.
  • the second feature of the present invention is that the LED is a side view type LED.
  • a projection for holding a predetermined distance between the base chassis and the diffusion plate is provided on the upper side in the Z direction of the LED cover.
  • a fourth feature of the present invention is that the LED cover and the protrusion are integrated.
  • a pattern having a predetermined area for shielding light emitted above the LED is provided on the diffusion plate directly above the LED. It is characterized by.
  • a sixth feature of the present invention is that the rear portion of the LED cover is an inclined surface.
  • the LED cover has a seventh feature of the present invention in which a ridge is provided on the upper side of the LED in the Z direction and in the emission direction.
  • the eighth feature of the present invention is that the bag has a shape divided for each of the accommodating portions.
  • the backlight device of the present invention is a backlight device for irradiating light from an emission surface, wherein the backlight device includes a base chassis and a backlight unit including a plurality of backlight blocks on the base chassis. Each of the backlight blocks is provided on the back side of the backlight block and on the base chassis, and is provided to face the reflection sheet.
  • a plate-like diffuser plate disposed at a predetermined interval in a direction orthogonal to the light irradiation surface of the light source, and parallel to the light irradiation surface of the backlight unit disposed in a space between the diffusion plate and the reflection sheet
  • a plurality of LEDs that emit light in a light emitting direction, and the LEDs are mounted, parallel to the reflective sheet
  • a ninth feature of the present invention includes an LED substrate provided on the upper surface side and an LED cover attached to the LED substrate and covering the upper side of the LED.
  • the liquid crystal display device of the present invention uses a liquid crystal panel and the backlight devices of the first to ninth features of the present invention as the tenth feature of the present invention. To do.
  • the present invention it is possible to provide a backlight device capable of improving the utilization efficiency of light from a light source and obtaining a high-quality image, and a liquid crystal display device using the backlight device.
  • FIG. 4 is an exploded perspective view illustrating an arrangement configuration of an example of main components in a display unit 310 of the video display device 300 illustrated in FIG. 3. It is the schematic diagram which demonstrated one Example of arrangement
  • FIG. 6 is a partial perspective view of a backlight device and a peripheral portion thereof according to a second embodiment of the present invention. It is a fragmentary sectional view of the optical axis direction of LED7 of the backlight apparatus which concerns on 3rd Example of this invention, and its peripheral part.
  • FIG. 6 is a partial perspective view of a backlight device and a peripheral portion thereof according to a third embodiment of the present invention.
  • FIG. 6 is a partial perspective view of a backlight device and a peripheral portion thereof according to a fourth embodiment of the present invention. It is a fragmentary perspective view of the modification of 4th Example of the LED cover used for the backlight apparatus of this invention. It is a fragmentary perspective view of 5th Example of the LED cover used for the backlight apparatus of this invention. It is a figure which shows the result of having simulated the luminance distribution observed with the diffusion plate of the front surface of the backlight apparatus of this invention when the LED cover of FIG. 13 is used.
  • FIG. 3 is a perspective view showing the external appearance of an embodiment of the video display device of the present invention.
  • a television receiver is cited as the video display device.
  • Reference numeral 300 denotes a video display device
  • 310 denotes a display unit of the video display device 300
  • 320 denotes a stand of the video display device 300.
  • the video display device 300 is a liquid crystal display device using a liquid crystal panel.
  • the video display device 300 includes a display unit 310 and a stand unit 320 that supports the display unit 310 from below. . Inside the display unit 310, as will be described later, a liquid crystal panel and a backlight device which are display devices are provided.
  • FIG. 4 is an exploded perspective view showing an arrangement configuration of one embodiment of main components in the display unit 310 of the video display device 300 shown in FIG.
  • Reference numeral 1 denotes a liquid crystal panel
  • 3 denotes a backlight unit
  • 4 denotes a backlight block
  • 22 denotes a diffusion plate
  • 402 denotes an optical sheet
  • 403 denotes an emission surface
  • 460 denotes a lower chassis.
  • the diffusion plate 22 is composed of one or more sheets.
  • the backlight device includes the backlight unit 3, the diffusion plate 22, and the optical sheet 402.
  • main parts constituting the display unit 310 of the video display device 300 are the liquid crystal panel 1 and the backlight unit 3 for irradiating light from the back surface of the liquid crystal panel 1.
  • the light emitted from the backlight unit 3 travels as indicated by an arrow A410, and reaches the liquid crystal panel 1 as indicated by an arrow B420 through the diffusion plate 22, the optical sheet 402, and the like.
  • a video signal is supplied to the liquid crystal panel 1 and the light transmittance of the liquid crystal elements constituting each pixel is controlled based on the video signal.
  • the light incident on the liquid crystal display panel 1 in accordance with the arrow B420 is spatially modulated by each pixel of the liquid crystal panel 1 to form an optical image, which is displayed on the exit surface 403 as an image. That is, the light incident on the liquid crystal panel 1 is emitted as image light as indicated by an arrow C430.
  • the backlight unit 3 includes a backlight block 4 or a combination of a plurality of the backlight blocks 4, and the entire backlight unit 3 is attached to and held by the lower chassis 460.
  • FIG. 5 is a schematic diagram illustrating an example of the arrangement of the LEDs 7 and the light emission direction when a part of the backlight unit 3 is viewed from the emission surface 403 (liquid crystal panel 1) side.
  • the LED 7-1, LED 7-2, LED 7-3,..., And LED 7 are arranged from the bottom to the top in the same direction as the light emission direction of the LED in parallel with the Y direction.
  • the LED 7-1, LED 7-2, LED 7-3,... are similarly arranged in the X direction.
  • the LED 7-1 is provided in the lowermost backlight block 4, the LED 7-2 is provided in the next-stage backlight block 4, and the LED 7-3 is provided in the next-stage backlight block 4. .
  • the backlight unit 3 is configured by combining a plurality of backlight blocks 4.
  • positioning of LED7 and the light emission direction although it comprised so that it might become from the bottom in FIG. 5, you may arrange
  • FIG. 6A is a partial cross-sectional view of the backlight block 4 viewed from the X direction.
  • 7 is an LED
  • 6 is an LED substrate on which the LED 7 is mounted
  • 610A is an LED cover surrounding the LED 7
  • 11 is a base chassis
  • 19 is a reflection sheet
  • 24 is an air layer
  • 22 and 23 are diffusion plates
  • 620A is a support pin. Note that one to a plurality of LEDs 7 are mounted on the LED substrate 6. 6A, in the air layer 24, a plurality of LEDs 7 (for example, LED 7-1 in FIG.
  • the LED 7 has a light emission direction parallel to the diffusion plate 22 from the air layer 24, that is, the optical axis of the light emitted from the LED 7 to the air layer 24 is the surface of the diffusion panel 22 (or the emission surface 403). It is provided so as to be parallel to the direction (Y direction) and perpendicular to the X axis.
  • the light emitted from the LED 7 travels through the air layer 24, is diffusely reflected between the reflection sheet 19 and the diffusion plate 22, is appropriately irradiated from the air layer 24 to the diffusion plate 22, and passes through the diffusion plate 23, the optical sheet 402, and the like.
  • the LED 7 is a side emission type (side view type) LED and emits white light.
  • the reflection sheet 19 is provided on the entire upper surface of the base chassis 11, the LED substrate 6 on which the LEDs 7 are mounted is provided on the upper surface side of the reflection sheet 19, and the LED cover 610A is It is provided on the LED substrate 6 so as to surround the LED 7.
  • the LED substrate 6 and the LED cover 610 ⁇ / b> A are configured so that light does not leak from the other portions of the LED 7 except for the exit portion of the LED 7.
  • a support pin 620A is provided to keep the height of the air layer 24 between the base chassis 11 and the reflection sheet 19 and the diffusion plate 22 constant.
  • the position of the support pin 620A is not limited to the position of the LED cover 610A or the rear part of the LED substrate 6 (lower side in the Y direction) as shown in FIG. 6A. In FIG. For convenience, they are only shown in individual positions.
  • the optical sheet 420 is present on the upper surface (front side in the Z direction) of the diffusion plate 23 (in the case of a liquid crystal display device, the liquid crystal panel 1 is present). Not shown.
  • One or more optical sheets 420 are stacked, and are, for example, brightness enhancement films such as BEF (Brightness Enhancement Film). Further, the positional relationship between the optical sheet 420 and the diffusion plate 23 may be arbitrary.
  • the luminance distribution shown by the solid line in FIG. 1 can be corrected to achieve a luminance distribution that does not cause uneven luminance.
  • the light emitted from the LED can be emitted from the backlight device to the diffusion plate with less loss than in the past by the LED cover.
  • FIG. 6B is a partial cross-sectional view of the backlight block 4 viewed from the X direction
  • FIG. 7 is a partial perspective view.
  • 610B is an LED cover surrounding the LED 7
  • 620B is a support pin.
  • FIG. 6B shows a configuration in which the instruction pin 620A between the base chassis 11 and the diffusion plate 22 in FIG. 6A is removed, and instead, a support pin 620B having a convex shape or the like is attached to the LED cover 610B.
  • the support pins 620 ⁇ / b> B cooperate with the LED cover 610 ⁇ / b> B and the LED substrate 6 to keep the height of the air layer 24 between the base chassis 11, the reflection sheet 19, and the diffusion plate 22 constant. Further, the support pins 620B are randomly arranged on the XY plane, and even when viewed from the emission surface 403 of the backlight device or the front surface side of the liquid crystal panel 1, there is a luminance boundary estimated to be generated due to the presence of the support pins 620B. It is preferable that it is not noticeable.
  • the optical sheet 420 is present on the upper surface (front side in the Z direction) of the diffusion plate 23 (in the case of a liquid crystal display device, the liquid crystal panel 1 is present). And it is not illustrated in FIG. As in the first embodiment, one or more optical sheets 420 are stacked, and are, for example, a brightness enhancement film such as BEF (Brightness Enhancement Film). Further, the positional relationship between the optical sheet 420 and the diffusion plate 23 may be arbitrary.
  • BEF Brightness Enhancement Film
  • FIG. 8 is a partial cross-sectional view of the backlight block 4 viewed from the X direction
  • FIG. 9 is a partial perspective view.
  • Reference numeral 824 denotes a print pattern.
  • FIGS. 8 and 9 are the same as FIGS. 6B and 7 of the second embodiment, in which a printed pattern 824 is provided around the portion corresponding to the direction directly above the LED 7 (arrow 410 in FIG. 4) on the upper surface of the diffusion plate 22. It is.
  • the color of the print pattern 824 is, for example, white, but may be transparent. If the refractive index is different from that of the diffuser plate 22, it functions sufficiently.
  • the print pattern 824 is arranged so that the emission port of the LED 7 extends obliquely forward (upward in the Y direction) from directly above the LED 7 (upward in the Z direction).
  • the shape is determined theoretically or experimentally, such as a rectangular shape, an elliptical shape, or a composite shape thereof. Further, it is not necessary to form the pattern by printing, and it is needless to say that a well-known technique may be used as the pattern forming method.
  • the printed pattern 824 reflects the incident light almost totally when light leaking directly above the LED 7 enters the diffusion plate 22. As a result, the light leaking directly above the LED 7 returns to the air layer 24.
  • the luminance peaks (regions P1 and P2) described with reference to FIGS. 1 and 2 can be further suppressed, and the solid line L1 in FIG.
  • the luminance distribution shown by the dotted line L2 in FIG. 1 can be obtained from the luminance distribution in FIG. Therefore, a luminance distribution with little luminance unevenness can be realized.
  • FIG. 10 is a partial cross-sectional view of the backlight block 4 viewed from the X direction
  • FIG. 11 is a partial perspective view.
  • Reference numeral 1010 denotes an LED cover. 10 and FIG. 11 are obtained by replacing the LED cover 610B with the LED cover 1010 in FIGS. 8 and 9 of the third embodiment.
  • the LED cover 1010 has an LED cover 610A of Example 1 and an LED 610B of Example 2 or Example 3 with an inclined surface at the rear (lower side in the Y direction) of the LED cover.
  • the light emitted from the LED 7-1 in FIG. 5 reaches the next LED 7-2, the light is incident on the diffusion plate 22 obliquely when it is irradiated and reflected on the slope of the LED cover 1010. To do.
  • the obliquely incident light is substantially totally reflected by the diffusion plate 22. Therefore, light leakage (for example, looks like a horizontal line) just above the rear portion of the LED 7 is reduced, and a luminance distribution with less luminance unevenness can be realized.
  • FIG. 12 is a partial perspective view of an embodiment of an LED cover used in the backlight device of the present invention, and shows a modification of the embodiment 4.
  • the support pins 620B are not shown.
  • the LED cover 1210 in FIG. 12 has a curved surface at the rear of the LED cover.
  • any surface shape may be used as long as the light irradiated on the rear surface is diffusely reflected and does not enter the surface of the diffusion plate 22 at a right angle. For example, fine irregularities may be provided on the rear surface.
  • one or a plurality of LEDs 7 mounted on the LED substrate 6 are provided in the storage portion 1201 partitioned by the partition 1202 of the LED cover 1210.
  • the LED cover 1210 is, for example, a structure integrally formed for each backlight block 4 and is fixed to the base chassis 11 by screwing or the like at portions of mounting holes 1203 provided in various places.
  • the luminance distribution shown by the solid line in FIG. 1 can be corrected to achieve a luminance distribution that does not cause uneven luminance.
  • the light emitted from the LED can be emitted from the backlight device to the diffusion plate with less loss than in the past by the LED cover.
  • Embodiment 5 of the backlight device of the present invention will be described with reference to FIGS.
  • the LED cover 1010 in FIG. 13 is different from the LED cover 1210 in FIG. 12 described in the fourth embodiment in that a collar 1301 is provided in the vicinity of the upper surface of the emission port of each LED 7 of the LED cover 1310.
  • FIG. 14 is a schematic diagram in which the LED cover 1310 according to the fifth embodiment is drawn on the simulation result diagram of the luminance distribution shown in FIG.
  • FIG. 15 is a schematic diagram illustrating the LED cover 1210 according to the fourth embodiment shown in FIG.
  • FIG. 16 shows the luminance distribution L4 improved by the fifth embodiment in addition to FIG.
  • the eaves 1301 on the LED cover 1310 As is apparent from FIG. 16 as compared with FIG. 15, by providing the eaves 1301 on the LED cover 1310, the amount of light traveling directly above the LED 7 is reflected by the amount of the first to fourth embodiments or more. Return to 24. For this reason, it is possible to suppress leakage to the diffusion plate 22 directly above (in the direction of the emission surface 403). As shown in FIG. 16, since the luminance distribution L1 is corrected to the luminance distribution L4, a backlight device and a liquid crystal display device with little luminance unevenness can be realized. Note that the collar 1301 has a shape divided for each housing portion 1201 of the LED 7.
  • the divided shapes are random shapes when viewed from the emission surface 403 or the front side of the liquid crystal panel 1, respectively, and also depending on the shape of the notch when viewed from the emission surface 403 of the backlight device or the front side of the liquid crystal panel 1. It is preferable that the luminance boundary estimated to be generated is not conspicuous.
  • the luminance distribution shown by the solid line in FIG. 1 can be corrected to achieve a luminance distribution with less luminance unevenness.
  • the LED cover and the print pattern allow light emitted from the LED to be emitted from the backlight device to the diffusion plate with less loss than in the past.
  • FIG. 17 is a side view of a sixth embodiment of the LED cover according to the present invention
  • FIG. 18 is a perspective view of the sixth embodiment of the LED cover.
  • this embodiment removes the wall surface (hereinafter referred to as “rear wall surface”) of the LED cover that faces the rear and rear surfaces of the LED 7, and the upper surface side of the LED 7. It is constructed so as to cover only. Therefore, as shown in FIG. 16, the LED cover 1016 according to the present embodiment is substantially T-shaped when viewed from the side, and the base chassis 11, the reflection sheet 19, or the diffusion plate 22, above the LED 7, 23, a roof portion 1017 parallel to the surface 23, and an indicator portion 1018 attached to the LED substrate or base chassis 11 and supporting the roof portion 1017.
  • a print pattern 824 similar to that of the above-described embodiment is formed at a position corresponding to the LED 7 of the roof portion 1017 and the front side thereof, and further support pins 620B are provided.
  • the LED cover 1016 according to the present embodiment does not have a rear wall surface, the function of reflecting the light from the LED 7 on the rear wall surface is lost, and the amount of light to the front side of the LED 7 is reduced.
  • the light from the LED located on the rear side of the LED at a certain position can be reduced by reflecting the light on the rear wall surface and going upward, when the diffusion plates 22 and 23 are viewed from above, Luminance unevenness such that the back of the LED cover 1016 shines locally is eliminated.
  • the width of the roof portion 1017 in this embodiment is, as shown in the drawing, the longitudinal direction (LED 7) of the roof portion 1017 when viewed from the diffusion plates 22 and 23 side. (The direction of arrangement).
  • the width of the portion corresponding to the LED 7 in the roof portion 1017 may be made larger than the width of the portion corresponding to the position between the LEDs 7.
  • the print pattern 824 is a continuous belt-like shape that is long in the longitudinal direction of the roof portion 1017 (the arrangement direction of the LEDs 7), but is not limited thereto, and is provided individually corresponding to the position of each LED 7. It may be oval or oval.
  • the elliptical or oval printed pattern 824 may further include a plurality of radial protrusions extending in the light emission direction of the LED 7. As described above, according to the present embodiment, it is possible to realize a backlight device and a liquid crystal display device that can obtain high luminance with little luminance unevenness.

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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

La présente invention concerne un dispositif d'éclairage par l'arrière qui possède un châssis de base et une unité d'éclairage par l'arrière installée sur le châssis de base et comportant de multiples blocs d'éclairage par l'arrière, chaque dispositif d'éclairage par l'arrière étant équipé de multiples DEL destinées à émettre de la lumière dans une direction d'émission parallèle au plan d'émission lumineuse de l'unité d'éclairage par l'arrière, d'un substrat de DEL pour le montage des DEL, qui est disposé parallèlement à un film réfléchissant et sur la surface supérieure de celui-ci, et d'un couvercle de DEL qui est fixé sur le substrat de DEL et qui recouvre les DEL dans la direction Z à partir du sommet et dans la direction X à partir des deux côtés afin de former des sections de boîtier qui abritent les DEL conjointement avec le substrat de DEL. Ledit dispositif d'éclairage par l'arrière est caractérisé en ce qu'il est configuré de telle sorte que la lumière de chacune des sources lumineuses est conduite vers un plan de sortie de la lumière en amenant la lumière à passer au travers d'un composant optique pendant que la lumière est réfléchie de manière répétée à l'intérieur d'un espace qui est formé entre le composant optique et l'élément réfléchissant.
PCT/JP2011/075112 2011-10-31 2011-10-31 Dispositif d'éclairage par l'arrière et dispositif d'affichage à cristaux liquides l'utilisant WO2013065116A1 (fr)

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PCT/JP2011/075112 WO2013065116A1 (fr) 2011-10-31 2011-10-31 Dispositif d'éclairage par l'arrière et dispositif d'affichage à cristaux liquides l'utilisant

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PCT/JP2011/075112 WO2013065116A1 (fr) 2011-10-31 2011-10-31 Dispositif d'éclairage par l'arrière et dispositif d'affichage à cristaux liquides l'utilisant

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004265697A (ja) * 2003-02-28 2004-09-24 Toyota Industries Corp 信号灯具及び信号灯具の反射構造
JP2005100837A (ja) * 2003-09-25 2005-04-14 Advanced Display Inc 面状光源装置及び表示装置
JP2006140131A (ja) * 2004-11-10 2006-06-01 Ctx Opto Electronics Corp 直下式バックライトモジュール
US20110075398A1 (en) * 2008-06-13 2011-03-31 Wheatley John A Collimating light engine
JP2011523194A (ja) * 2008-06-13 2011-08-04 スリーエム イノベイティブ プロパティズ カンパニー 漸進的注入を有する照明装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004265697A (ja) * 2003-02-28 2004-09-24 Toyota Industries Corp 信号灯具及び信号灯具の反射構造
JP2005100837A (ja) * 2003-09-25 2005-04-14 Advanced Display Inc 面状光源装置及び表示装置
JP2006140131A (ja) * 2004-11-10 2006-06-01 Ctx Opto Electronics Corp 直下式バックライトモジュール
US20110075398A1 (en) * 2008-06-13 2011-03-31 Wheatley John A Collimating light engine
JP2011523194A (ja) * 2008-06-13 2011-08-04 スリーエム イノベイティブ プロパティズ カンパニー 漸進的注入を有する照明装置

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