WO2021131252A1 - Dispositif d'éclairage plan - Google Patents

Dispositif d'éclairage plan Download PDF

Info

Publication number
WO2021131252A1
WO2021131252A1 PCT/JP2020/038864 JP2020038864W WO2021131252A1 WO 2021131252 A1 WO2021131252 A1 WO 2021131252A1 JP 2020038864 W JP2020038864 W JP 2020038864W WO 2021131252 A1 WO2021131252 A1 WO 2021131252A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
optical sheet
hole
sheet
shielding portion
Prior art date
Application number
PCT/JP2020/038864
Other languages
English (en)
Japanese (ja)
Inventor
菅原　聡
知子 大原
正雄 宮本
Original Assignee
ミネベアミツミ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ミネベアミツミ株式会社 filed Critical ミネベアミツミ株式会社
Priority to CN202080089264.2A priority Critical patent/CN114846272A/zh
Priority to JP2021556548A priority patent/JP7019881B2/ja
Publication of WO2021131252A1 publication Critical patent/WO2021131252A1/fr

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to a planar lighting device.
  • planar lighting device used for the backlight of a liquid crystal display device
  • a plurality of light sources such as LEDs (Light Emitting Diodes) are two-dimensionally arranged, and an optical sheet or the like is arranged on the light emitting surface side, so-called.
  • a direct type planar lighting device is known.
  • the amount of light differs between the portion directly above the light source such as an LED and the other portion, and uneven brightness is likely to occur. Therefore, the light is formed of a material that blocks, reflects, or diffuses the light. It has been proposed that a member such as a direction changing portion is arranged directly above a light source (see, for example, Patent Document 1 and the like). Further, another optical sheet may be further overlapped on the exit surface provided with the above-mentioned member for blocking light or the like.
  • the optical sheet arranged on the exit surface provided with the above-mentioned member for blocking light has also been thinned. Therefore, depending on the thickness of the member that blocks light, the optical sheet may be deformed (deformed by transferring the shape of the member that blocks light, etc.), causing uneven brightness, which may adversely affect the optical characteristics. was there.
  • the present invention has been made in view of the above, and an object of the present invention is to provide a planar lighting device capable of reducing an adverse effect on optical characteristics.
  • the planar illumination device includes a substrate, a first optical sheet, and a second optical sheet.
  • a plurality of light sources are arranged two-dimensionally on the substrate.
  • the first optical sheet is arranged on the surface side of the substrate on which the light source is provided, and a light-shielding portion is provided at a position overlapping the center of the light source in a plan view.
  • the second optical sheet is arranged on the surface side of the first optical sheet where the light-shielding portion is provided, and is provided with a through hole or a recess for accommodating the thickness of the light-shielding portion.
  • planar lighting device can reduce adverse effects on optical characteristics.
  • FIG. 1 is a plan view of the planar lighting device according to the first embodiment.
  • FIG. 2 is a cross-sectional view taken along the line AA in FIG.
  • FIG. 3 is a partial cross-sectional view of the planar lighting device of the comparative example.
  • FIG. 4 is a plan view of the planar lighting device according to the second embodiment.
  • FIG. 5 is a cross-sectional view taken along the line AA in FIG.
  • FIG. 6 is a cross-sectional view taken along the line BB in FIG.
  • FIG. 7 is a plan view of the planar lighting device according to the third embodiment.
  • FIG. 8 is a cross-sectional view taken along the line AA in FIG.
  • FIG. 9 is a diagram showing another configuration example of the optical sheet according to the fourth embodiment.
  • planar lighting device according to the embodiment will be described with reference to the drawings.
  • the present invention is not limited to this embodiment.
  • the relationship between the dimensions of each element in the drawing, the ratio of each element, and the like may differ from the reality. Even between drawings, there may be parts with different dimensional relationships and ratios. Further, in principle, the contents described in one embodiment or modification are similarly applied to other embodiments or modifications.
  • FIG. 1 is a plan view of the planar lighting device 1 according to the first embodiment
  • FIG. 2 is a cross-sectional view taken along the line AA in FIG. In FIG. 1, the housing frame of the planar lighting device 1 is not shown.
  • the planar illumination device 1 has a substantially rectangular planar shape, and has a structure in which a light guide plate 4, a base sheet 5, and an optical sheet 7 are laminated in this order on a substrate 2.
  • An arbitrary number of other optical sheets (third optical sheets) may be laminated on the outside of the optical sheet 7.
  • Light sources 3 made of a plurality of LEDs or the like are arranged two-dimensionally on the substrate 2, and electrical wiring to each light source 3 is also provided.
  • the lighting of the plurality of light sources 3 is controlled individually or in units of a plurality of groups by the control of so-called local dimming.
  • a coating such as white is applied, a reflective sheet is attached, or a reflective sheet is placed.
  • measures against reflection are not taken.
  • the light guide plate 4 is laminated on the surface of the substrate 2 on the side where the light source 3 is arranged.
  • the light guide plate 4 is made of a transparent resin such as polycarbonate, and a light source through hole 4a for accommodating the light source 3 is provided in the thickness direction.
  • the light guide plate 4 receives light from the light source 3 through the inner wall surface of the light source through hole 4a, passes through the inside, and then emits light to the outside.
  • the light guide plate 4 may be provided with a through hole for a pseudo light source in addition to the through hole 4a for a light source, and the embodiment thereof will be described later. Further, although the light guide plate 4 may not be provided, the embodiment thereof will be described later.
  • the base sheet 5 is arranged on the surface of the light guide plate 4 opposite to the substrate 2.
  • the base sheet 5 is the optical sheet closest to the light source 3 side, and may be a simple transparent sheet.
  • the base sheet 5 of the present embodiment is a prism sheet in which a plurality of prisms are formed on the surface of the light guide plate 4 (or the substrate 2).
  • the surface on the exit surface side (the surface opposite to the substrate 2) at a position overlapping the center of the light source 3 in a plan view from the emission surface side (upper side of FIG. 2) of the planar illumination device 1.
  • a light-shielding portion 6 is provided.
  • the light-shielding portion 6 is sized so as to cover the light source through hole 4a of the light guide plate 4 when viewed from the exit surface side of the planar lighting device 1, for example.
  • the outer shape of the light-shielding portion 6 seen from the exit surface side of the planar lighting device 1 is, for example, circular.
  • a polygon such as an ellipse or a quadrangle may be used, or a pattern in which a plurality of straight lines such as x and * are crossed (the degree of shading in the central part is increased and the periphery is increased. A pattern in which the degree of shading of the part is lowered) may be used.
  • the light-shielding portion 6 is composed of, for example, a single or a plurality of print layers.
  • the light-shielding portion 6 reflects the light directly emitted from the light source 3 through the light source through hole 4a to the exit surface side of the planar illumination device 1 and the inner wall surface of the light source through hole 4a from the light source 3 for planar illumination. Light emitted to the exit surface side of the device 1 and light emitted to the exit surface side of the planar lighting device 1 through the inner wall surface of the light source through hole 4a are blocked to reduce uneven brightness.
  • the light-shielding portion 6 does not have to have a light-shielding degree of 100%, and can be a light-shielding degree sufficient to reduce luminance unevenness.
  • each part of the light-shielding portion 6 does not have to have a uniform light-shielding degree, and for example, the light-shielding degree of the central portion can be increased and the light-shielding degree of the peripheral portion can be lowered.
  • the printing layer having a large diameter and the printing layer having a small diameter laminated on the printing layer can increase the degree of shading in the central portion and decrease the degree of shading in the peripheral portion. ..
  • the base sheet 5 is an example of the first optical sheet.
  • the optical sheet 7 is arranged on the surface side of the base sheet 5 opposite to the substrate 2 (the exit surface side of the planar illumination device 1).
  • the optical sheet 7 may be simply laminated on the base sheet 5, or may be wholly or partially adhered to the base sheet 5 with a double-sided tape, an adhesive, or the like.
  • the optical sheet 7 may be a sheet (film) for adjusting brightness characteristics, light distribution characteristics, etc., such as a diffusion sheet, a prism sheet (including a pyramid film), and a brightness improving sheet, and does not affect the optical characteristics. It may be just a transparent sheet.
  • the optical sheet 7 is provided with a through hole 7a for accommodating the thickness of the light-shielding portion 6 on the base sheet 5.
  • the thickness of the light-shielding portion 6 is drawn to be about half the thickness of the optical sheet 7 in FIG. 2, the thickness of the light-shielding portion 6 may be larger than the thickness of the optical sheet 7, and the through hole 7a may be used. A part of the thickness of the light-shielding portion 6 may be accommodated.
  • the other optical sheet (third optical sheet) arranged on the outside of the optical sheet 7 may be flat, or the through hole or the recess (opposing the light-shielding portion 6) at a position corresponding to the through hole 7a. The side to be used) may be provided.
  • the through hole 7a is also circular.
  • the diameter of the through hole 7a is larger than the diameter of the light-shielding portion 6 by a clearance in consideration of mounting errors. For example, a clearance of about 10% is provided with respect to the diameter of the light-shielding portion 6.
  • the size of the clearance is not limited to this, and in particular, when the optical sheet 7 is a "mere transparent sheet", the clearance may be larger than 10%.
  • a recess may be provided in place of the through hole 7a, but the embodiment thereof will be described later.
  • the optical sheet 7 is an example of a second optical sheet.
  • FIG. 3 is a partial cross-sectional view of the planar lighting device 1'of the comparative example, and is a cross-sectional view at a location similar to that of FIG. The plan view is the same as that in FIG.
  • the substrate 2', the light source 3', the light source plate 4', the light source through hole 4a', the base sheet 5', and the light-shielding portion 6' are the substrate 2 of the planar illumination device 1 of FIG. 2, the light source 3, and the light source 3.
  • This is the same as the light guide plate 4, the light source through hole 4a, the base sheet 5, and the light shielding portion 6.
  • the optical sheet 7' is not provided with a through hole 7a, and the optical sheet 7'is arranged directly on the base sheet 5'provided with the light-shielding portion 6'. Therefore, as shown in FIG.
  • the optical sheet 7' when the optical sheet 7'is thin, the optical sheet 7'is deformed by the thickness of the light-shielding portion 6', which may adversely affect the optical characteristics such as causing uneven brightness. is there.
  • the optical sheet 7' when the optical sheet 7'is a prism sheet in which minute prisms are formed on the surface, the surface of the optical sheet 7'is not flat due to deformation, so that the direction in which light is emitted is not planned. , Causes uneven brightness.
  • the thickness of the light-shielding portion 6 is accommodated by the through hole 7a provided in the optical sheet 7, and the optical sheet 7 is the light-shielding portion 6. Since the optical sheet 7 is not deformed, there is no possibility of adversely affecting the optical characteristics. Although the portion of the through hole 7a of the optical sheet 7 loses its function as an optical sheet, since the amount of light is suppressed by the light-shielding portion 6, there is almost no possibility of adversely affecting the optical characteristics.
  • the clearance surrounding the light-shielding portion 6 is also as small as about 10% as described above (as described above, the size of the clearance is not limited to about 10%, but it is still minute. There is almost no risk of adversely affecting the optical characteristics. In particular, when another optical sheet is provided on the outside of the optical sheet 7, the influence on the optical characteristics is further eliminated.
  • (Second embodiment) 4 is a plan view of the planar illumination device 1 according to the second embodiment
  • FIG. 5 is a sectional view taken along the line AA in FIG. 4
  • FIG. 6 is a sectional view taken along the line BB in FIG. is there.
  • This second embodiment is different from the above-described first embodiment in that the light guide plate 4 is provided with a through hole 4b for a pseudo light source in addition to the through hole 4a for a light source.
  • the through holes 7a accommodating the light-shielding portion 6 are arranged two-dimensionally in the vertical and horizontal directions, and the through points for the pseudo light source are formed at the rectangular corner points surrounding the through holes 7a and the midpoints of the rectangular sides.
  • a hole 4b is provided.
  • the arrangement of the through hole 7a and the through hole 4b for the pseudo light source is not limited to the one shown in the drawing, and the through hole for the pseudo light source can be arranged in a triangular shape around the through hole 7a.
  • a light source through hole 4a is provided in the light guide plate 4 corresponding to a portion where the light source 3 by an LED or the like is provided on the substrate 2.
  • the through hole 4b for a pseudo light source is provided in a portion where there is no light source 3.
  • Light incident from the light source 3 through the inner wall surface of the light source through hole 4a passes through the inside of the light guide plate 4 and then is emitted from the inner wall surface of the pseudo light source through hole 4b. Similar to the hole 4a, the pseudo light source through hole 4b emits light. Therefore, even if the density of the arrangement of the light sources 3 on the substrate 2 is reduced, the uneven brightness is not increased, and the manufacturing cost can be reduced by reducing the number of the light sources 3. Since the actual light source 3 does not exist in the pseudo light source through hole 4b, the light shielding portion 6 for blocking the light directly emitted from the light source 3 to the exit surface side of the planar lighting device 1 becomes unnecessary.
  • the effect of the through hole 7a of the optical sheet 7 is the same as that of the first embodiment. Since the optical sheet 7 does not come into contact with the light-shielding portion 6, the optical sheet 7 is not deformed, which adversely affects the optical characteristics. There is no risk of it.
  • FIG. 7 is a plan view of the planar lighting device 1 according to the third embodiment
  • FIG. 8 is a cross-sectional view taken along the line AA in FIG.
  • the light guide plate 4 is removed from the first embodiment of FIGS. 1 and 2.
  • the light guide plate 4 may be removed from the second embodiment of FIGS. 4 to 6.
  • the substrate 2, the light source 3, the base sheet 5, the light-shielding portion 6, the optical sheet 7, and the through hole 7a are the same as those in the first embodiment of FIGS. 1 and 2.
  • the light guide plate 4 disappears in FIG. 8, the base sheet 5 is supported on the substrate 2 at a predetermined interval by a spacer or the like (not shown). If the distance between the substrate 2 and the base sheet 5 is too short, the light from the light source 3 does not spread sufficiently and reaches the base sheet 5 to cause uneven brightness. It is an interval. Further, since the light guide plate 4 does not exist, it is not necessary to determine the diameter of the light shielding portion 6 according to the diameter of the light source through hole 4a of the light guide plate 4. In this case, it is sufficient for the light-shielding portion 6 to block the light emitted directly from the light source 3 to the exit surface side.
  • the effect of the through hole 7a of the optical sheet 7 is the same as that of the first embodiment. Since the optical sheet 7 does not come into contact with the light-shielding portion 6, the optical sheet 7 is not deformed, which adversely affects the optical characteristics. There is no risk of it.
  • FIG. 9 is a diagram showing another configuration example of the optical sheet 7 according to the fourth embodiment.
  • FIG. 9 shows only the optical sheet 7, and can be applied instead of the optical sheet 7 in the first to third embodiments.
  • the optical sheet 7 is provided with a through hole 7a, but in the fourth embodiment, the optical sheet 7 is provided with a recess for accommodating the thickness of the light-shielding portion 6. There is.
  • the optical sheet 7 is formed by laminating the sheet member 71 and the sheet member 72.
  • One sheet member 71 is provided with a through hole 71a, and the other sheet member 72 is not provided with a through hole. Then, in a state where the sheet member 71 and the sheet member 72 are stuck together, the portion of the through hole 71a becomes the recess 7b. That is, the recess 7b of the optical sheet 7 is formed by the through hole 71a of the sheet member 71 and the sheet member 72.
  • the depth of the recess 7b (equal to the thickness of the sheet member 71) is set to a size larger than the thickness of the light-shielding portion 6.
  • the seat member 71 is an example of the first seat member.
  • the seat member 72 is an example of the second seat member.
  • the effect of the recesses 7b of the optical sheet 7 is the same as that of the first to third embodiments, and since the optical sheet 7 does not come into contact with the light-shielding portion 6, the optical sheet 7 is not deformed, which adversely affects the optical characteristics. There is no risk of causing Since the portion of the sheet member 72 that overlaps the recess 7b is not a through hole, the sheet member 72 can exert its function as an optical sheet, and the influence of the recess 7b on the optical characteristics can be further reduced.
  • the light-shielding portion 6 is moved to the surface side of the base sheet 5 on the substrate 2 side, and the base sheet 5 is moved to the substrate 2 side (the first).
  • An optical sheet 7 as a second optical sheet provided with a through hole 7a or a recess 7b (FIG. 9) is arranged between the base sheet 5 and the light guide plate 4 in the first and second embodiments. It may be.
  • FIG. 5 or FIG. 8 another optical sheet (between the base sheet 5 and the light guide plate 4 in the first and second embodiments) is placed on the substrate 2 side of the base sheet 5.
  • the optical sheet of 4) may be arranged.
  • the light-shielding portion 6 is moved to the surface side of the base sheet 5 on the substrate 2 side, and the through hole 7a or the recess 7b is moved to the substrate 2 side of the base sheet 5 (FIG.
  • another optical sheet (fourth optical sheet) may be arranged on the surface of the optical sheet 7 on the substrate 2 side.
  • the planar illuminator according to the embodiment is arranged on the substrate on which a plurality of light sources are arranged two-dimensionally and on the surface side where the light sources of the substrate are provided, and is located at a position overlapping the center of the light sources in a plan view.
  • the light-shielding portion is arranged on the surface side of the first optical sheet opposite to the substrate, or on the surface side of the first optical sheet on the substrate side. This makes it possible to improve the degree of freedom in arranging the light-shielding portion.
  • the light-shielding portion is composed of a single or a plurality of printing layers. Thereby, it can be applied to a light-shielding portion having various structures.
  • the outer shape of the light-shielding portion is circular in a plan view, and the through hole or recess accommodating the thickness of the light-shielding portion is circular in size larger than the outer shape of the light-shielding portion by a predetermined clearance.
  • the optical characteristics can be arbitrarily adjusted, and the influence of the through holes or recesses of the second optical sheet on the optical characteristics can be reduced.
  • the first optical sheet or the second optical sheet includes a fourth optical sheet arranged on the surface side of the substrate side closer to the substrate. This makes it possible to arbitrarily adjust the optical characteristics.
  • a light guide plate which is arranged adjacent to the surface side where the light source of the substrate is provided and has a through hole for accommodating the light source provided in the thickness direction.
  • the light guide plate is provided with a through hole for a pseudo light source in the thickness direction around the through hole for accommodating the light source.
  • a planar lighting device including a light guide plate provided with a through hole for accommodating a light source and a through hole for a pseudo light source.
  • the second optical sheet a first sheet member provided with a through hole and a second sheet member not provided with a through hole are laminated, and the through hole and the second sheet member of the first sheet member are laminated.
  • a recess of the second optical sheet is formed by the sheet member of the above.
  • the present invention is not limited by the above-described embodiment.
  • the present invention also includes a configuration in which the above-mentioned components are appropriately combined. Further, further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspect of the present invention is not limited to the above-described embodiment, and various modifications can be made.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

Un dispositif d'éclairage plan (1) d'un mode de réalisation de la présente invention est pourvu d'un substrat (2), d'une première feuille optique (5) et d'une seconde feuille optique (7). Une pluralité de sources de lumière (3) sont disposées en deux dimensions sur le substrat (2). La première feuille optique (5) est disposée sur le côté de surface où les sources de lumière (3) sur le substrat (2) sont disposées, et est pourvue de parties de blocage de lumière (6) à des emplacements chevauchant les centres des sources de lumière (3) dans une vue en plan. La seconde feuille optique (7) est disposée sur le côté de surface où les parties de blocage de lumière (6) sur la première feuille optique (5) sont disposées, et est pourvue de trous traversants (7a) ou de parties évidées (7b) pour loger l'épaisseur des parties de blocage de lumière (6).
PCT/JP2020/038864 2019-12-26 2020-10-15 Dispositif d'éclairage plan WO2021131252A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202080089264.2A CN114846272A (zh) 2019-12-26 2020-10-15 面状照明装置
JP2021556548A JP7019881B2 (ja) 2019-12-26 2020-10-15 面状照明装置

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2019-236635 2019-12-26
JP2019236635 2019-12-26
JP2020078923 2020-04-28
JP2020-078923 2020-04-28

Publications (1)

Publication Number Publication Date
WO2021131252A1 true WO2021131252A1 (fr) 2021-07-01

Family

ID=76574280

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/038864 WO2021131252A1 (fr) 2019-12-26 2020-10-15 Dispositif d'éclairage plan

Country Status (3)

Country Link
JP (1) JP7019881B2 (fr)
CN (1) CN114846272A (fr)
WO (1) WO2021131252A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006107105A1 (fr) * 2005-04-01 2006-10-12 Sony Corporation Dispositif d’éclairage de fond, unité d’affichage à cristaux liquides et feuille de polarisation optique
US20110051412A1 (en) * 2009-08-27 2011-03-03 Chansung Jeong Backlight unit and display device
JP2011210674A (ja) * 2010-03-30 2011-10-20 Sumita Optical Glass Inc 発光装置
JP2014510387A (ja) * 2011-04-04 2014-04-24 エルジー イノテック カンパニー リミテッド 照明装置

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2426857B (en) * 2005-05-31 2009-10-07 Lg Philiph Lcd Co Ltd Backlight assembly for liquid crystal display device and liquid crystal display device using the same
CN100565298C (zh) * 2005-12-15 2009-12-02 三菱电机株式会社 面状光源装置以及使用其的显示装置
CN101315163B (zh) * 2007-06-01 2011-02-09 鸿富锦精密工业（深圳）有限公司 发光二极管照明装置
JP5305629B2 (ja) * 2007-10-15 2013-10-02 株式会社ジャパンディスプレイ 液晶表示装置
JP5190735B2 (ja) * 2008-03-06 2013-04-24 Ｎｌｔテクノロジー株式会社 バックライト及び液晶表示装置
KR100964466B1 (ko) * 2009-11-24 2010-06-16 엘지전자 주식회사 디스플레이 장치
JP2011060594A (ja) * 2009-09-10 2011-03-24 Fujitsu Ltd イルミネーションユニット、機器及びその製造方法
KR101399039B1 (ko) * 2011-04-04 2014-05-27 엘지이노텍 주식회사 조명장치 및 이를 포함하는 액정표시장치
JP5917940B2 (ja) * 2012-02-21 2016-05-18 ミネベア株式会社 面状照明装置
JP5532104B2 (ja) * 2012-10-18 2014-06-25 オムロン株式会社 面光源装置、液晶表示装置及びモバイル機器
US20160154172A1 (en) * 2013-09-04 2016-06-02 Sharp Kabushiki Kaisha Lighting device and display device
CN203825226U (zh) * 2014-05-21 2014-09-10 北京京东方光电科技有限公司 导光板、背光模组及显示装置
JP6321697B2 (ja) * 2016-02-12 2018-05-09 ミネベアミツミ株式会社 面状照明装置
DE202018100020U1 (de) * 2017-09-19 2018-02-12 Vital Lighting Co., Ltd Streulampenschirm und Flachlampe mit dem Lampenschirm
JP2019125519A (ja) * 2018-01-18 2019-07-25 シャープ株式会社 照明装置および表示装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006107105A1 (fr) * 2005-04-01 2006-10-12 Sony Corporation Dispositif d’éclairage de fond, unité d’affichage à cristaux liquides et feuille de polarisation optique
US20110051412A1 (en) * 2009-08-27 2011-03-03 Chansung Jeong Backlight unit and display device
JP2011210674A (ja) * 2010-03-30 2011-10-20 Sumita Optical Glass Inc 発光装置
JP2014510387A (ja) * 2011-04-04 2014-04-24 エルジー イノテック カンパニー リミテッド 照明装置

Also Published As

Publication number Publication date
JP7019881B2 (ja) 2022-02-15
JPWO2021131252A1 (fr) 2021-07-01
CN114846272A (zh) 2022-08-02

Similar Documents

Publication Publication Date Title
US10802334B2 (en) Backlight unit and liquid crystal display device including the same
US11029562B2 (en) Backlight unit and liquid crystal display device including the same
US20120218752A1 (en) Light source module and optical member
JP2021517351A (ja) 照明装置
US20200379298A1 (en) Lighting device and liquid crystal display apparatus
WO2009102066A1 (fr) Panneau lumineux
JP6133048B2 (ja) 照明ユニット及びそれを用いたディスプレイ装置
JP2019129060A (ja) 照明装置および表示装置
JP2023160861A (ja) 発光装置、表示装置および照明装置
US11333818B2 (en) Display device, illumination device, and light guiding member
JP2018181630A (ja) バックライト
JP2010102905A (ja) 面状光源及び液晶表示装置
JP2010097783A (ja) 面状光源及び液晶表示装置
WO2020054602A1 (fr) Dispositif d'éclairage de surface
WO2021131252A1 (fr) Dispositif d'éclairage plan
US10809571B2 (en) Lighting device and display device
KR20120023345A (ko) 백라이트 유닛 및 그의 제조 방법
JP2009231012A (ja) バックライトユニット
JP2010102906A (ja) 面状光源及び液晶表示装置
TW202125032A (zh) 配光控制元件
CN110609413A (zh) 照明装置和显示装置
JP2019125445A (ja) 面状ライトユニット
US11506832B2 (en) Planar illumination device with light guide plate with pseudo light sources
US11994767B2 (en) Lighting device using wavelength conversion sheet, and display device using the same
WO2021095405A1 (fr) Dispositif d'éclairage plan

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20904291

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2021556548

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20904291

Country of ref document: EP

Kind code of ref document: A1