WO2020100304A1 - Dispositif électroluminescent plan - Google Patents

Dispositif électroluminescent plan Download PDF

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Publication number
WO2020100304A1
WO2020100304A1 PCT/JP2018/042510 JP2018042510W WO2020100304A1 WO 2020100304 A1 WO2020100304 A1 WO 2020100304A1 JP 2018042510 W JP2018042510 W JP 2018042510W WO 2020100304 A1 WO2020100304 A1 WO 2020100304A1
Authority
WO
WIPO (PCT)
Prior art keywords
light source
emitting device
light emitting
base member
distance
Prior art date
Application number
PCT/JP2018/042510
Other languages
English (en)
Japanese (ja)
Inventor
広輔 長下
大樹 岩崎
萌 長谷川
Original Assignee
株式会社光波
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 株式会社光波 filed Critical 株式会社光波
Priority to CN201880099513.9A priority Critical patent/CN113039654A/zh
Priority to PCT/JP2018/042510 priority patent/WO2020100304A1/fr
Publication of WO2020100304A1 publication Critical patent/WO2020100304A1/fr

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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
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements

Definitions

  • the present invention relates to a planar light emitting device.
  • a planar light emitting device has been proposed in which a display section is illuminated by light emitted from a light source including a light emitting element such as a light emitting diode (see Patent Document 1).
  • the surface emitting device described in Patent Document 1 includes a diffuser plate and a light emitting plate disposed on the back side of the diffuser plate, and the light emitting plate includes a plurality of surface emitting modules having the same shape.
  • Each of the surface emitting modules includes a light emitting section including a plurality of LED light sources and a driving section that drives the light emitting section.
  • planar light emitting device described in Patent Document 1 when used for a planar light emitting device such as an advertising signboard, when the planar light emitting device is made thinner, an attempt is made to reduce the distance between the light emitting unit and the display unit. The light emitted from the LED light source may be reflected as an image directly on the display unit. Further, if an attempt is made to increase the number of LED light sources in order to suppress the light emitted from the LED light sources from being reflected as an image on the display unit, the manufacturing cost may increase and the mounting space for control parts and the like may be insufficient. is there.
  • an object of the present invention is to reduce the light emitted from the light source without increasing the number of light sources to a certain number or more even when the distance between the light emitting unit and the display unit is limited to a certain number or less. It is an object of the present invention to provide a planar light emitting device that can suppress the appearance of an image on the display unit.
  • the light source emits light without increasing the number of light sources to a certain number or more. It is possible to prevent light from being reflected as an image on the display unit.
  • FIG. 1 It is a schematic diagram which partially shows an example of a structure of the planar light-emitting device which concerns on embodiment of this invention. It is a longitudinal section showing an example of composition of an LED light source typically. It is a figure which shows an example of a diffusion sheet. Diffusion pattern It is a figure explaining an example of the shape of a diffusion pattern. It is a figure which shows an example of the positional relationship of an LED light source and a diffusion pattern. It is a longitudinal cross-sectional view which expands and shows a part of planar light emitting device shown in FIG.
  • FIGS. 1 to 5 An embodiment of the present invention will be described with reference to FIGS. 1 to 5. Note that the embodiments described below are shown as preferred specific examples for carrying out the present invention, and some parts specifically exemplify various technically preferable technical matters. The technical scope of the present invention is not limited to this specific embodiment. Further, the dimensional ratio of each constituent element in each drawing does not necessarily match the dimensional ratio of the actual planar light emitting device.
  • FIG. 1 is a schematic diagram partially showing an example of the configuration of the planar light emitting device according to the embodiment of the present invention.
  • the planar light emitting device 1 is attached to a base member 3 to which a plurality of LED light sources 2 are attached, a cover member 4 that covers the base member 3, and an upper surface 41 b of a top plate 41 of the cover member 4.
  • a support member 7 for supporting the.
  • the top plate 41 is an example of a display unit.
  • the LED light source 2 is an example of a light source.
  • the number of LED light sources 2 may be one. It should be noted that, for convenience of explanation, the seal member 5 is drawn thicker than the actual thickness.
  • the LED element 20 and the phosphor 22 may be combined.
  • the package substrate 21 is not limited to having a substantially rectangular parallelepiped shape, and has, for example, a flat plate shape or a substantially hemispherical shape (that is, a dome shape). You can use any
  • the LED light source 2 is mounted on a printed circuit board 30 fixed on the base member 3.
  • the arrangement of the LED light sources 2 in a plan view may be appropriately adjusted according to the advertisement design described on the seal member 5 described later. It is not always necessary to provide the printed circuit board 30, and the LED light source 2 may be mounted by directly forming a pattern on a resin material or a metal material.
  • p is from the tip end surface of the LED light source 2 in the thickness direction to the upper surface of the top plate 41 of the cover member 4. It is larger than the distance H 1 to 41b (see FIG. 5). This is to reduce the number of LED light sources 2.
  • the upper surface 41b of the upper surface plate 41 is an example of a display surface.
  • the base member 3 has, for example, a substantially disc shape.
  • the base member 3 is made of, for example, a metal such as aluminum or a resin such as polycarbonate.
  • a printed circuit board 30 including various wirings connected to the LED light source 2, electronic components, and the like is provided on the upper surface 3a of the base member 3.
  • the cover member 4 is a lid-type member that includes an upper surface plate 41 having a substantially disc shape, and a side surface plate 42 that is connected to the radially outer end portion 41 a of the upper surface plate 41 substantially vertically.
  • the cover member 4 is formed of, for example, a colorless or milky white transparent resin material such as polycarbonate or acrylic, or a glass material.
  • the cover member 4 has a size that engages with the base member 3. In the example shown in FIG. 1, the angle ⁇ formed by the upper surface plate 41 and the side surface plate 42 is drawn larger than 90 °, but it may be 90 ° or less. Further, the cover member 4 is not limited to the one having the above-mentioned shape, and may be appropriately adjusted according to the shape of the base member 3.
  • the seal member 5 is attached to the upper surface 41b of the upper surface plate 41 of the cover member 4.
  • a design such as an advertisement or a decoration used for a showcase or a signboard (hereinafter, also referred to as “advertisement design”) is described, and light emitted from the LED light source 2 is applied from the lower side to the cover member 4.
  • the advertisement design written on the seal member 5 is displayed so as to shine.
  • the advertisement design is an example of a display target.
  • the seal member 5 may be attached to the lower surface 41c of the upper surface plate 41 of the cover member 4. Moreover, the seal member 5 does not necessarily have to be provided, and for example, a configuration in which an advertisement design is drawn on the upper surface plate 41 of the cover member 4 may be used. That is, it suffices if the advertisement design is displayed on the display unit (top plate 41 in the specific example).
  • FIG. 3 is a diagram showing an example of the diffusion sheet 6.
  • the diffusion sheet 6 is a substantially circular sheet having a diameter smaller than the diameter of the base member 3 and the inner diameter of the cover member 4. Further, the diffusion sheet 6 has a thickness of, for example, 0.5 mm or less, and preferably has a thickness of 0.2 mm or less.
  • the shape of the diffusion sheet 6 is not limited to the above-mentioned shape, and may be appropriately adjusted according to the advertisement design, the shapes of the base member 3 and the cover member 4, and the like.
  • FIG. 4A is a diagram illustrating an example of the shape of the diffusion pattern 60
  • FIG. 4B is a diagram illustrating an example of a positional relationship between the LED light source 2 and the diffusion pattern 60.
  • the diffusion pattern 60 is for diffusing the light emitted from the LED light source 2 in the surface direction of the diffusion sheet 6 before it hits the display portion (specifically, the upper surface plate 41) of the cover member 4. Further, the diffusion pattern 60 may further have a property of diffusing the light emitted from the LED light source 2 and of blocking the light or reflecting the light.
  • the diffusion pattern 60 preferably symmetrically reduces the light blocking rate indicating the degree of light blocking in the radial direction with the point substantially directly above the LED light source 2 as the center point in the plane of the diffusion sheet 6.
  • the diffusion pattern 60 has rotational symmetry with a rotation axis that is a straight line that passes through a point substantially directly above the LED light source 2 and is perpendicular to the diffusion sheet 6.
  • the protrusion 62 has, for example, a substantially isosceles triangular shape surrounded by a base 621 that is common to the arc of the central portion 61 and two equal sides 622 that are connected at both ends of the base 621.
  • the distance a between the center point O of the central portion 61 and the apex 623 of the protruding portion 62 (hereinafter, also referred to as “apex distance a”) has a predetermined ratio with respect to the radius b of the central portion 61. There is. Preferably, the ratio between the apex distance a and the radius b is 1.5 to 3.0 times.
  • the number of protrusions 62 may be appropriately adjusted according to the desired degree of diffusion and the light blocking rate. Preferably, the number of protrusions 62 is 10 or more.
  • the adjacent protrusions 62 may be in close contact with each other or may be separated from each other.
  • the diffusion pattern 60 is printed on the front surface of the diffusion sheet 6 by using, for example, silk printing with an ink having a predetermined composition.
  • Silk printing is an example of printing.
  • the ink is composed of, for example, a mixture of white and black having a predetermined ratio with respect to white. The ratio of black to white is preferably 10% or less.
  • the diffusion pattern 60 is provided at a position corresponding to each LED light source 2 in plan view. Specifically, in plan view, the position of the center point O of the central portion 61 of the diffusion pattern 60 and the position of the central portion (see the “+” mark) of the LED light source 2 substantially match.
  • the diffusion pattern 60 is provided for each LED light source 2. That is, the number of diffusion patterns 60 is equal to the number of LED light sources 2.
  • FIG. 5 is a vertical cross-sectional view schematically showing an enlarged part of the planar light emitting device 1.
  • the diffusion sheet 6 is provided in the internal space 10 of the planar light emitting device 1 substantially parallel to the base member 3 and the top plate 41 of the cover member 4 so as not to contact the cover member 4. Further, the diffusion sheet 6 is arranged such that the front surface on which the diffusion pattern 60 is printed faces upward. The diffusion sheet 6 may be arranged such that the front surface on which the diffusion pattern 60 is printed faces downward, or both sides may be printed.
  • the distance from the front end surface of the LED light source 2 to the upper surface 41b of the top plate 41 of the cover member 4 (hereinafter, also referred to as “first distance”) is set to H 1, and the front end surface of the LED light source 2 and the diffusion sheet 6 are set.
  • the distance (hereinafter, also referred to as the “second distance”) to the lower surface of is described as H 2 .
  • the first distance H 1 is an example of the distance between the LED light source 2 and the display unit (top plate 41).
  • the second distance H 2 is an example of the distance between the LED light source 2 and the diffusion sheet 6.
  • an average value excluding those statistically regarded as exceptions May be the position of the tip surface of the LED light source 2.
  • the planar light emitting device 1 is a thin light emitting device in which the first distance H 1 is set to, for example, 20 mm or less, preferably 12 to 15 mm.
  • the second distance H 2 has a predetermined ratio with respect to the first distance H 1 . Specifically, the second distance H 2 has a ratio of not less than the first predetermined value (lower limit value) and not more than the second predetermined value (upper limit value) to the first distance H 1 .
  • the lower limit of the second ratio of the distance H 2 to the first distance H 1 is preferably about 0.45. This is because when the second distance H 2 is smaller than about 0.45 times the first distance H 1 , the image of the light emitted from the LED light source 2 is directly reflected on the seal member 5.
  • the upper limit of the second ratio of the distance H 2 to the first distance H 1 is preferably about 0.75. This is because when the second distance H 2 is set to be greater than about 0.75 times the first distance H 1 , the light emitted from the LED light source 2 appears on the seal member 5 as a shadow pattern. In other words, the second distance H 2 is 0.45 to 0.75 times the first distance H 1 . H 2 is preferably 6 to 10 mm.
  • Table 1 summarizes the main pieces of numerical information regarding the diffusion sheet 6 and the diffusion pattern 60 described above.
  • the planar light emitting device 1 According to the planar light emitting device 1 according to the embodiment of the present invention, even when the distance between the light emitting unit and the display unit is limited to a certain value or less, the number of light sources is increased to a certain number or more. Therefore, it is possible to suppress the light emitted from the light source from being reflected as an image on the display unit.
  • the diffusion sheet 6 is mainly formed only by printing the diffusion pattern 60, it is possible to further suppress an increase in manufacturing cost.
  • the shape of the diffusion pattern 60 is not limited to the above.
  • the diffusion pattern 60 may be one in which the black density decreases continuously or stepwise from the center point O toward the outside in the radial direction.
  • the black density may be adjusted by the black blending ratio of the ink used to draw the diffusion pattern 60.
  • the present invention is applied to a lighting device, an advertisement display device such as a signboard, and the like.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L'invention concerne un dispositif électroluminescent plan 1 comprenant : un élément de base 3 auquel une source de lumière 2 est montée ; un élément de couvercle 4 qui recouvre l'élément de base 3 et comprend une unité d'affichage éclairée par la lumière émise par la source de lumière 2 ; et une feuille de diffusion 6 qui est disposée dans un espace interne 10, formé par l'élément de base 3 et l'élément de couvercle 4, sensiblement parallèlement à l'élément de base 3 sans entrer en contact avec l'élément de couvercle 4, et qui a un motif de diffusion 60 pour diffuser la lumière sensiblement centrée directement au-dessus de la source de lumière 2.
PCT/JP2018/042510 2018-11-16 2018-11-16 Dispositif électroluminescent plan WO2020100304A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201880099513.9A CN113039654A (zh) 2018-11-16 2018-11-16 面状发光装置
PCT/JP2018/042510 WO2020100304A1 (fr) 2018-11-16 2018-11-16 Dispositif électroluminescent plan

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2018/042510 WO2020100304A1 (fr) 2018-11-16 2018-11-16 Dispositif électroluminescent plan

Publications (1)

Publication Number Publication Date
WO2020100304A1 true WO2020100304A1 (fr) 2020-05-22

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ID=70731120

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/042510 WO2020100304A1 (fr) 2018-11-16 2018-11-16 Dispositif électroluminescent plan

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CN (1) CN113039654A (fr)
WO (1) WO2020100304A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62126856U (fr) * 1986-02-04 1987-08-12
JP2009301738A (ja) * 2008-06-10 2009-12-24 Furukawa Electric Co Ltd:The ライトボックス
JP2010508544A (ja) * 2006-10-30 2010-03-18 ジーエル コリア カンパニー リミテッド 照明装置用カバープレート
JP2012234729A (ja) * 2011-05-02 2012-11-29 Asahi Kasei Corp 照明装置
WO2013111338A1 (fr) * 2012-01-27 2013-08-01 日立コンシューマエレクトロニクス株式会社 Dispositif de rétroéclairage et dispositif d'affichage d'image utilisant le dispositif de rétroéclairage
JP2014143113A (ja) * 2013-01-24 2014-08-07 Skg:Kk 照明装置
US20170317243A1 (en) * 2016-04-29 2017-11-02 Lg Display Co., Ltd. Light emitting diode package module and display device having the same

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004311353A (ja) * 2003-04-10 2004-11-04 Advanced Display Inc 面状光源装置および該装置を用いた液晶表示装置
JP2013211245A (ja) * 2012-02-29 2013-10-10 Hitachi Consumer Electronics Co Ltd 照明装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62126856U (fr) * 1986-02-04 1987-08-12
JP2010508544A (ja) * 2006-10-30 2010-03-18 ジーエル コリア カンパニー リミテッド 照明装置用カバープレート
JP2009301738A (ja) * 2008-06-10 2009-12-24 Furukawa Electric Co Ltd:The ライトボックス
JP2012234729A (ja) * 2011-05-02 2012-11-29 Asahi Kasei Corp 照明装置
WO2013111338A1 (fr) * 2012-01-27 2013-08-01 日立コンシューマエレクトロニクス株式会社 Dispositif de rétroéclairage et dispositif d'affichage d'image utilisant le dispositif de rétroéclairage
JP2014143113A (ja) * 2013-01-24 2014-08-07 Skg:Kk 照明装置
US20170317243A1 (en) * 2016-04-29 2017-11-02 Lg Display Co., Ltd. Light emitting diode package module and display device having the same

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