WO2011021737A1 - Dispositif rétroéclairé comportant une fonction de gradation locale - Google Patents

Dispositif rétroéclairé comportant une fonction de gradation locale Download PDF

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Publication number
WO2011021737A1
WO2011021737A1 PCT/KR2009/004664 KR2009004664W WO2011021737A1 WO 2011021737 A1 WO2011021737 A1 WO 2011021737A1 KR 2009004664 W KR2009004664 W KR 2009004664W WO 2011021737 A1 WO2011021737 A1 WO 2011021737A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
inclined surface
guide plate
light guide
groove
Prior art date
Application number
PCT/KR2009/004664
Other languages
English (en)
Korean (ko)
Inventor
유성일
Original Assignee
단비기술 유한회사
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 단비기술 유한회사 filed Critical 단비기술 유한회사
Priority to PCT/KR2009/004664 priority Critical patent/WO2011021737A1/fr
Publication of WO2011021737A1 publication Critical patent/WO2011021737A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0018—Redirecting means on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer

Definitions

  • the present invention relates to a backlight device such as a liquid crystal display device, a surface light source for illumination, and more particularly, to form a plurality of inclined surfaces on a light guide plate, and to install a second reflector on the plurality of inclined surfaces, and at the same time, the lower portion of the light guide plate on which the inclined surfaces are formed.
  • the local dimming function is enabled by driving the LED light source installed in several compartments.
  • a light guide panel is a plate that provides a path for uniformly scattering and diffusing light from a light source, and is applied to a light receiving type flat panel display device such as a liquid crystal display device or a backlight device used for lighting. .
  • a cold cathode fluorescent lamp (CCFL) or an LED is widely used.
  • CCFL cold cathode fluorescent lamp
  • Such a backlight device is disclosed in Korean Patent Application Nos. 195-33115, 2001-25870, 2001-53844, and the like.
  • the conventional backlight device 10 includes a light guide plate 11, a reflector 12 disposed below the light guide plate 11, a light source 13 provided on a side surface of the light guide plate 11, and a light source ( And a cover member 14 for covering 13.
  • a cold cathode fluorescent lamp or an LED may be used as the light source 13 .
  • the light guide plate 11 is formed with a plurality of light guide patterns 15 for uniformly guiding light incident into the light guide plate.
  • the backlight device 10 configured as described above, light from the light source 13 is incident on the light guide plate 11, and the incident light is guided through the light guide plate 11, as indicated by the arrow, and then the light guide pattern 15. After being refracted or scattered out of the light guide plate 11 and exiting to the outside of the light guide plate 11, it is reflected by the reflector 12 or immediately exited to the upper surface to pass through the upper diffusion material 16 or prism 17, thereby being relatively uniform. You get a surface light source.
  • the backlight device configured as described above has a problem in that it is difficult to implement a local dimming function for adjusting the brightness of light by dividing the partition because the light guide plate is integrated.
  • the LEDs In addition, in order to implement a local dimming function when not using a light guide plate, the LEDs generally have a local dimming function by arranging thousands of LED light sources in a plane, modularizing them into a predetermined section, and then lighting each section. However, this costs a large number of LED light sources. In addition, in order to obtain a uniform surface light source, an additional light diffusing lens, a diffusion plate, or the like is required, which causes a problem that the thickness of the backlight device becomes thick.
  • the present invention has been made to solve the above problems, and an object of the present invention is to provide a backlight device that can implement a local dimming function that can differently adjust the brightness of light for each section of the light guide plate. .
  • Another object of the present invention is to provide a backlight device having a thin thickness while at the same time obtaining a uniform surface light source without using a large number of LEDs.
  • a backlight device includes a light source, a light guide plate for uniformly guiding light emitted from the light source, a first reflector provided below the light guide plate, and a diffusion material provided on the light guide plate.
  • the light guide plate is divided into a plurality of compartments by at least one or more inclined surfaces, a second reflector for reflecting light from the light source into the first light inclined surface of the at least one or more inclined surfaces, At least one light source is provided below the light guide plate on which the second reflecting material is installed, so that the light guide plate emits light for each section.
  • the first inclined surface is characterized in that it has a straight or curved shape.
  • the second reflector may be a resin reflecting sheet, a metal reflector or a material having a high light reflectance.
  • a light diffusing material or a light absorbing material is installed or coated on the rear surface of the second reflecting material.
  • the inclined surface of the light guide plate adjacent to the first inclined surface is characterized in that overlapping.
  • the light diffusing material or the light absorbing material is installed or coated on the inclined surface of the light guide plate adjacent to the first inclined surface.
  • the inclined surface of the light guide plate adjacent to the first inclined surface is characterized in that the opposite direction to the first inclined surface.
  • a backlight device which includes a light source, a light guide plate for uniformly guiding light emitted from the light source, a first reflector disposed below the light guide plate, and an upper portion of the light guide plate.
  • a backlight device including a diffuser provided, wherein at least one groove having an inclined surface is formed in the light guide plate, a second reflector is installed in the groove having an inclined surface, and at least one LED light source under the light guide plate having a groove having an inclined surface. Is installed, it is characterized in that the local dimming function is implemented by driving one or more LED light sources are partitioned in a predetermined area to emit light.
  • At least one groove having the inclined surface penetrates the light guide plate.
  • the width of the groove having the inclined surface is characterized in that formed in 1 mm or less.
  • At least one groove having the inclined surface is characterized in that processed by a laser.
  • At least one groove having the inclined surface is characterized in that formed in the shape of an intermittent line.
  • the second reflective member provided in the groove having the inclined surface may be a resin reflective sheet, a metallic reflective plate, or a material having high light reflectance.
  • the light diffusing material or the light absorbing material is installed or coated on the back of the reflecting surface of the second reflecting material installed in the groove having the inclined surface.
  • the light diffusing material or the light absorbing material is installed or coated on the inclined surface opposite the reflective surface of the second reflecting material provided in the groove having the inclined surface.
  • FIG. 1 is a cross-sectional view schematically showing a conventional backlight device.
  • FIG. 2 is a side cross-sectional view of a backlight device according to a first embodiment of the present invention.
  • FIG. 3 is a plan view of the backlight device of FIG. 2.
  • FIG. 4 is a view illustrating an LED light source module arranged under the light guide plate in the backlight device of FIG. 2.
  • FIG. 5 is a side cross-sectional view of a backlight device according to a second embodiment of the present invention.
  • FIG. 6 is a side cross-sectional view of a backlight device according to a third embodiment of the present invention.
  • FIG. 2 is a side cross-sectional view of a backlight device according to a first embodiment of the present invention
  • FIG. 3 is a plan view of the backlight device of FIG. 2
  • FIG. 4 is a view showing an LED light source module arranged below the light guide plate in the backlight device of FIG. 2.
  • a plurality of light guide plates 201 are provided in the backlight device 200.
  • the light guide pattern 201a is formed on at least one side of the light guide plate 201.
  • a plurality of inclined surfaces 202 are formed in the light guide plate 201, and a second reflecting material 203 is provided in the inclined surfaces 202.
  • At least one LED light source 204 is disposed below the inclined surface 202, and the LED light source 204 is covered by the second reflector 203 provided on the inclined surface 202 when viewed from the top of the light guide plate 201. It has a losing structure.
  • the lower part of the light guide plate 201 is provided with a first reflector 205 that can reflect light emitted from the lower surface of the light guide plate 201 upward.
  • a diffuser 206 for scattering and diffusing light is provided on the light guide plate 201, and a prism 207 for condensing light is provided on the diffuser 206.
  • Light emitted from the LED light source 204 is incident on the inclined surface 202 of the light guide plate 201, and the light incident on the inclined surface 202 is inside the light guide plate 201 by the second reflector 203 provided on the inclined surface 202.
  • the path is changed and the light guide plate 201 is light guided by the total reflection effect.
  • the guided light is reflected, refracted, and scattered by the light guide pattern 201a, and the light is emitted to the outside of the light guide plate 201.
  • the light emitted to the lower surface of the light guide plate 201 is reflected through the first reflector 205, passes through the light guide plate 201, passes through the diffuser 206 on the upper surface of the light guide plate 201, and then passes through the prism 207.
  • the light guide pattern 201a is uniform by increasing the pattern density at the portion away from the LED light source 204 and the inclined surface 202 and lowering the pattern density at the portion near the LED light source 204 and the inclined surface 202.
  • One surface light source can be obtained.
  • the LED light source 204 is driven by dividing into a plurality of regions to adjust the brightness of each section of the light guide plate 201 to be different from the other sections.
  • the LED light source 204 is composed of a plurality of LED combinations, as shown in Figure 3 can be used by placing a plurality of LED light source 204 on one substrate. In this manner, local dimming may be effectively implemented in the edge light type backlight device 200 using the light guide plate 201.
  • the light guide plate 201 has a second light source on the inclined surface 202 to reflect the light from the LED light source 204 into the light guide plate 201 while preventing the LED light source 204 from being visible from the top surface.
  • Reflector 203 is formed.
  • the width of the second reflecting material 203 (toward the inside of the surface) is formed larger than the width of the LED light source 204.
  • the shape of the inclined surface 202 is illustrated in a straight line in FIG. 2, a shape having a curvature or irregularities may be possible.
  • the second reflecting member 203 provided on the inclined surface 202 may be formed by a resin reflecting sheet or a metallic reflecting plate, and may be installed by various methods such as coating of a material having high light reflectance.
  • the light diffusing member or the light absorbing member 208 may be installed or coated on the back surface of the second reflecting member 203.
  • the formation of the inclined surface 202 can be various methods such as laser processing, NC processing, injection molding, extrusion molding.
  • the boundary portion 209 exists between the divided light emitting regions. Since the boundary portion 209 may appear as a bright portion or a dark portion in the backlight device 200, it is necessary to uniformly distribute the light distribution of the boundary portion 209.
  • the inclined surface 202 is formed on the light guide plate 201, the second reflector 203 is provided on the inclined surface 202, and the LED light source 204 is disposed below the inclined surface 202. Installed. As the light is blocked by the second reflector 203 provided on the inclined surface 202, a dark portion appears.
  • the non-light emitting region on the inclined surface 202 on which the second reflector 203 is installed is adjacent to each other.
  • An inclined surface 202 is formed on the neighboring light guide plate 201 that forms the boundary portion 209 to emit light by the light guide plate 201 so that the inclined surface 202 of the light guide plate 201 overlaps.
  • the inclined surface 202 of the neighboring light guide plate 201 corresponding to the inclined surface 202 provided with the second reflector 203 is preferably widened so that the inclined surface 202 is sufficiently overlapped so that the non-light emitting area does not appear.
  • the second reflecting member 203 is provided on another adjacent inclined surface 202 overlapping the inclined surface 202 provided with the second reflecting member 203.
  • Light is supplied from the LED light source 204 in a different area from the supply.
  • the boundary portion 209 where the two inclined surfaces 202 overlap with each other is strongly emitted by the LED light source 204 of another region, and tends to be a curved portion.
  • the bent portion appearing at the boundary portion 209 needs to be adjusted to the same brightness as that of the area that is normally uniformly emitted.
  • the back surface of the second reflector 203 is reflected.
  • the light diffuser or light absorber 208 is installed on the inclined surface 202 adjacent to the inclined surface 202 on which the second reflector 203 is installed, or the light diffuser or light absorber 208 is additionally installed. There is a way.
  • FIG. 5 is a side cross-sectional view of a backlight device according to a second embodiment of the present invention.
  • the inclined surfaces 202 of the neighboring light guide plate 201 instead of the two inclined surfaces 202 of the neighboring light guide plate 201 in parallel in surface contact with each other, the inclined surfaces 202 which are spread to the left and right sides are respectively provided. It can also be arranged.
  • the light emitting plate 201 may reach the inside of the light guide plate 201 to increase light efficiency.
  • the light exits to the outside of the inclined surface 202 and emits light, thereby allowing the dark portion of the inclined surface 202 to be alleviated. In this manner, local dimming may be easily implemented in the edge light type backlight device 200 using the light guide plate 201.
  • FIG. 6 is a side cross-sectional view of a backlight device according to a third embodiment of the present invention.
  • the backlight device 200 is provided with a light guide plate 201 having a plurality of inclined grooves 208.
  • the light guide pattern 201a is formed on at least one side of the light guide plate 201.
  • a second reflecting material 203 is provided in the inclined groove 208 formed in the light guide plate 201.
  • At least one LED light source 204 is disposed below the groove 208 having the inclined surface 202. In addition, when viewed from the top, the LED light source 204 is covered by the second reflecting material 203 provided in the inclined groove 208.
  • the lower surface of the light guide plate 201 is provided with a first reflector 205 for reflecting light emitted from the lower surface of the light guide plate 201 to the upper portion, and a diffusion material for scattering and diffusing light on the upper portion of the light guide plate 201. 206 is provided.
  • the prism 207 which condenses light is provided in the upper part of the diffusing material 206.
  • Light from one or more LED light sources 204 installed under the plurality of inclined grooves 208 formed in the light guide plate 201 is incident to the inclined grooves 208, and the incident light is inclined surfaces of the inclined grooves 208.
  • the light reflected by the second reflector 203 provided at 202 to the inside of the light guide plate 201 and incident to the inside of the light guide plate 201 is guided to the inside of the light guide plate 201 by the total reflection effect.
  • the guided light is refracted or scattered by the light guide pattern 201a to be emitted to the upper surface of the light guide plate 201, and the light emitted from the light guide pattern 201a is reflected through the first reflector 205, and again, the light guide plate After passing through the 201, the light guide plate 201 passes through the diffusion material 206 and then passes through the prism 207 to exit the front surface.
  • the light guiding pattern 201a has a high density at a portion far away from the LED light source 204 and the inclined groove 208 in the light guide plate 201 and the LED light source 204 and the inclined groove 208.
  • the nearby part is formed with a relatively low density to achieve a uniform surface light source.
  • one or more LED light sources 204 may be appropriately differentially dimmed so that the brightness of each compartment is differentially controlled from the other compartments.
  • the LED light source 204 is composed of a plurality of LED combinations, and a plurality of LED light sources 204 may be installed and used on one substrate.
  • the inclination angle of the inclined groove 208 is preferably about 45 degrees, the angle of the inclination angle may vary depending on the thickness of the light guide plate 201, the length and light distribution of the light guide plate 201. It is preferable to form the width of the inclined groove 208 as narrow as possible to 1 mm or less to minimize the non-light emitting area.
  • the depth of the inclined groove 208 may be up to the thickness of the light guide plate 201 penetrating the light guide plate 201, and the formation of the inclined groove may be performed by laser processing, and may be implemented by NC processing or injection molding. Do.
  • the second reflector 203 provided in the inclined groove 208 can be installed using a resin reflective sheet, a metallic reflector, or by applying a material having a high light reflectance.
  • the second reflector 203 serves to change the path of the light so that the light emitted from the LED light source 204 is incident on the light guide plate 201, and also when viewed from the top surface of the light guide plate 201. At the same time, it blocks the light so that it is not visible.
  • a plurality of grooves 208 having an inclined surface 202 on which the second reflector 203 is installed form a plurality of grooves 208 when dividing the light emitting area for dimming the backlight device 200.
  • the area of the second reflecting material 203 provided on the inclined surface 202 of the () is blocked, and the light traveling to the upper portion of the light guide plate 201 is blocked, so that when viewed from the top surface of the light guide plate 201, it appears as a non-light emitting area.
  • a groove having an inclined surface 202 is formed in the light guide plate 201 so that the light guide plate 201 emits light to the non-light emitting region of the second reflecting material 203, and is adjacent to the inclined surface 202 provided with the second reflecting material 203.

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

Abstract

L’invention concerne un dispositif rétroéclairé qui comprend: une source lumineuse; un panneau guide de lumière qui guide uniformément la lumière émise par la source lumineuse; un premier élément réfléchissant qui est installé dans la partie inférieure du panneau guide de lumière; et un élément de diffusion qui est installé dans la partie supérieure du panneau guide de lumière. Le panneau guide de lumière est divisé en une pluralité de parties par au moins une surface inclinée, et, pour cette surface inclinée, un second élément réfléchissant servant à réfléchir la lumière émise par la source lumineuse vers l’intérieur du panneau guide de lumière est installé sur une première surface inclinée, et au moins une source lumineuse est positionnée dans la partie inférieure du panneau guide de lumière équipé du second élément réfléchissant, la lumière étant émise par chaque partie du panneau guide de lumière.
PCT/KR2009/004664 2009-08-21 2009-08-21 Dispositif rétroéclairé comportant une fonction de gradation locale WO2011021737A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2009/004664 WO2011021737A1 (fr) 2009-08-21 2009-08-21 Dispositif rétroéclairé comportant une fonction de gradation locale

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2009/004664 WO2011021737A1 (fr) 2009-08-21 2009-08-21 Dispositif rétroéclairé comportant une fonction de gradation locale

Publications (1)

Publication Number Publication Date
WO2011021737A1 true WO2011021737A1 (fr) 2011-02-24

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PCT/KR2009/004664 WO2011021737A1 (fr) 2009-08-21 2009-08-21 Dispositif rétroéclairé comportant une fonction de gradation locale

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111256094A (zh) * 2020-01-22 2020-06-09 广州市焦汇光电科技有限公司 光学装置、光学***和光学幕墙投影***

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002082622A (ja) * 2000-09-05 2002-03-22 Enplas Corp 画像表示装置及び面光源装置
JP2007149657A (ja) * 2005-11-04 2007-06-14 Showa Denko Kk 導光部材およびこの導光部材を用いた面光源装置、ならびに表示装置
JP2007180022A (ja) * 2005-11-30 2007-07-12 Showa Denko Kk 面光源装置および表示装置
JP2008192395A (ja) * 2007-02-02 2008-08-21 Seiko Instruments Inc 照明装置及び液晶表示装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002082622A (ja) * 2000-09-05 2002-03-22 Enplas Corp 画像表示装置及び面光源装置
JP2007149657A (ja) * 2005-11-04 2007-06-14 Showa Denko Kk 導光部材およびこの導光部材を用いた面光源装置、ならびに表示装置
JP2007180022A (ja) * 2005-11-30 2007-07-12 Showa Denko Kk 面光源装置および表示装置
JP2008192395A (ja) * 2007-02-02 2008-08-21 Seiko Instruments Inc 照明装置及び液晶表示装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111256094A (zh) * 2020-01-22 2020-06-09 广州市焦汇光电科技有限公司 光学装置、光学***和光学幕墙投影***
CN111256094B (zh) * 2020-01-22 2022-09-23 广州市焦汇光电科技有限公司 光学装置、光学***和光学幕墙投影***

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