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WO2008015762A1 - Dispositif d'affichage - Google Patents

Dispositif d'affichage Download PDF

Info

Publication number
WO2008015762A1
WO2008015762A1 PCT/JP2006/315526 JP2006315526W WO2008015762A1 WO 2008015762 A1 WO2008015762 A1 WO 2008015762A1 JP 2006315526 W JP2006315526 W JP 2006315526W WO 2008015762 A1 WO2008015762 A1 WO 2008015762A1
Authority
WO
WIPO (PCT)
Prior art keywords
transparent cover
display device
downward
light emitting
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2006/315526
Other languages
English (en)
Japanese (ja)
Inventor
Hirotomo Yaegasi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Corp
Panasonic Holdings Corp
Original Assignee
Panasonic Corp
Matsushita Electric Industrial Co Ltd
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 Panasonic Corp, Matsushita Electric Industrial Co Ltd filed Critical Panasonic Corp
Priority to PCT/JP2006/315526 priority Critical patent/WO2008015762A1/fr
Publication of WO2008015762A1 publication Critical patent/WO2008015762A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • G09F9/302—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 characterised by the form or geometrical disposition of the individual elements
    • G09F9/3026—Video wall, i.e. stackable semiconductor matrix display modules
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F27/00—Combined visual and audible advertising or displaying, e.g. for public address
    • G09F27/008—Sun shades, shades, hoods or louvres on electronic displays to minimise the effect of direct sun light on the display
    • 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

Definitions

  • the present invention relates to a display device in which light emitting elements are arranged.
  • FIG. 7 shows a local configuration of a conventional display device.
  • the LED element 103 is provided on the LED substrate 105.
  • the LED element 103 is a shell type.
  • a terminal force LED substrate 105 behind the LED element 103 is attached.
  • a plate-shaped light shielding louver 107 protrudes above the LED element 103.
  • the light blocking louver 107 prevents the LED element 103 from being irradiated with external light such as sunlight.
  • the periphery of the LED element 103 is filled with black silicon 109. This silicone 109 ensures waterproofness.
  • the configuration shown in FIG. 7 continues in the vertical direction and the horizontal direction, thereby forming a large display panel (see Japanese Patent Laid-Open No. 2000-181363).
  • a conventional general display device has been configured with a bullet-type LED element.
  • display devices having surface-mounted (SMD) LED elements have been proposed.
  • SMD surface-mounted
  • Such a display device is advantageous in terms of reduction in thickness.
  • the surface side of the light emitting part has a waterproof structure like a bullet-type LED, the use location is restricted to the interior.
  • the present invention has been made under the above background, and an object thereof is to provide a display device capable of improving image quality when a transparent cover is provided in front of a light emitting element.
  • the display device of the present invention includes a plurality of light emitting elements arranged in a vertical direction and a horizontal direction, and at least one transparent cover positioned on the front side of the plurality of light emitting elements, and the transparent cover has a downward direction. It has a surface shape in which a downward surface facing upward and an upward surface facing upward appear alternately in the vertical direction.
  • the upward surface may be a horizontal surface or a surface facing diagonally upward.
  • the display device includes a plurality of light emitting elements arranged in the vertical direction and the horizontal direction, and at least one transparent cover positioned on the front side of the plurality of light emitting elements, and is transparent.
  • the cover is divided into a plurality of surfaces, and each of the plurality of surfaces reflects incident light in a direction different from the viewing direction.
  • the direction or angle of each divided surface may be changed sequentially so that each surface reflects incident light in a direction different from the viewing direction.
  • the direction of the adjacent dividing planes may be set differently.
  • FIG. 1 is a cross-sectional view of a display device according to an embodiment of the present invention.
  • FIG. 2 is a perspective view of a display device according to an embodiment of the present invention.
  • FIG. 3 is a front view of a display device according to an embodiment of the present invention.
  • Figure 4 shows the front view of the transparent cover.
  • Fig. 5 is a diagram showing how external light is reflected by the transparent cover.
  • Fig. 6 is a diagram showing the amount of external light reflection in the viewing direction on the transparent cover.
  • Fig. 7 is a sectional view of a conventional display device.
  • the display device of the present invention includes a plurality of light emitting elements arranged in the vertical direction and the horizontal direction, and at least one transparent cover positioned on the front side of the plurality of light emitting elements, and the transparent cover has a downward direction. It has a surface shape in which a downward surface facing upward and an upward surface facing upward appear alternately in the vertical direction.
  • the upward surface may be a horizontal surface or a surface facing diagonally upward.
  • the transparent cover has a surface shape in which a downward surface and an upward surface appear alternately, so that the external light reflected in the visual recognition direction by the transparent cover can be reduced, and black is displayed even in a bright environment.
  • a high-contrast display can be performed, and the image quality can be improved.
  • the downward surface is inclined downward with respect to the horizontal plane, and may be formed of a curved surface.
  • the downward surface may be a concave curved surface.
  • an antireflection layer may be provided on the surface of the transparent cover.
  • the display device includes a plurality of light emitting elements arranged in the vertical direction and the horizontal direction, and at least one transparent cover positioned on the front side of the plurality of light emitting elements, and is transparent.
  • the cover is divided into a plurality of surfaces, and each of the plurality of surfaces reflects incident light in a direction different from the viewing direction.
  • the direction or angle of each divided surface may be changed sequentially so that each surface reflects incident light in a direction different from the viewing direction.
  • the direction of the adjacent dividing planes may be set differently. Even with this configuration, it is possible to reduce the external light reflected in the viewing direction by the transparent cover, display a high contrast with the black sinking even in a bright environment, and improve the image quality.
  • Fig. 1 and 3 show a display device according to an embodiment of the present invention.
  • Fig. 1 shows the configuration of the main part
  • Fig. 2 shows the overall configuration.
  • the display device 1 has a plurality of display panels 3.
  • the plurality of display panels 3 are attached to the attachment frame 5 and united to form a large display device 1.
  • Each display panel 3 has a plurality of light emitting elements arranged in a matrix in the vertical direction and the horizontal direction. In the entire display device, a plurality of light emitting elements are arranged in the vertical direction and the horizontal direction.
  • the light emitting element is an LED element.
  • the display device 1 is installed, for example, on an exercise facility or a building wall.
  • FIG. 1 is a longitudinal sectional view of the display panel 3.
  • FIG. 1 shows a part of the display panel 3. More specifically, FIG. 1 shows the upper two LED elements 11 in one display panel 3.
  • the LED element 11 is a surface mount type (SMD) LED element and is mounted on the LED substrate 13.
  • a plate-shaped light shielding louver 15 protrudes forward slightly above each LED element 11.
  • the light shielding louver 15 blocks outside light from above such as sunlight.
  • a transparent cover 17 is disposed on the front side of the LED element 11.
  • the transparent cover 17 is held by cover holding walls 19 and 21 provided on the light shielding louver 15. As shown in the figure, the cover holding walls 19 and 21 protrude upward and downward from the respective light shielding louvers 15.
  • the upper light shielding louver 15 of each LED element 11 has a cover holding wall 21 protruding downward, and the lower light shielding louver 15 of each LED element 11 is covered upwardly. have.
  • These cover holding walls 19 and 21 hold the transparent cover 17 with vertical force.
  • the LED element 11 is covered with the transparent cover 17, the upper and lower cover holding walls 19, 21 and the upper and lower light shielding louvers 15, thereby ensuring the waterproofness of the LED element 11 and the LED substrate 13.
  • FIG. 3 is a view of a part of the display device 1 as seen from the front force.
  • the plurality of LED elements 11 are arranged in the horizontal direction at regular intervals.
  • the light shielding louver 15 has an elongated shape extending in the lateral direction.
  • a plurality of parallel light shielding louvers 15 are arranged in the vertical direction.
  • the light shielding louvers 15 are positioned on the horizontal rows of the LED elements 11.
  • the transparent cover 17 also has an elongated shape extending in the lateral direction.
  • the transparent cover 17 is a strip-shaped or bar-shaped member.
  • a plurality of parallel transparent covers 17 are arranged in the vertical direction. And the transparent cover 17 is located so that each row
  • FIG. 4 shows the transparent cover 17 alone.
  • the plurality of parallel transparent covers 17 are connected to each other at the connection portion 23 to form an aggregate.
  • the transparent cover 17 is made of transparent resin.
  • each single band-like member in FIG. 4 is called the transparent cover 17.
  • the plurality of belt-like members in FIG. 4 may be collectively referred to as a transparent cover.
  • one strip member covers a plurality of LED elements 11 arranged in the horizontal direction.
  • one strip member functions as a cover for the plurality of LED elements 11. Therefore, the front area of each LED element 11 may be called a transparent cover.
  • one belt-like member is a member in which a plurality of transparent covers are combined.
  • the cover assembly in FIG. 4 is molded in advance with a mold for manufacturing a cover. Then, it is set in a mold that forms the cover aggregate power shielding louver 15 of FIG. Then black fat is poured into the mold. As a result, the shading louver 15 and the transparent cover 17 ( And a front panel with cover retaining walls 19, 21) is formed. This front panel is located in front of the LED element 11 and the LED element 13 and performs a light shielding function and a waterproof function.
  • the black portion (the light shielding louver 15 and the cover holding walls 19 and 21) may be formed in advance with a mold. Then, the black member is set in another mold and transparent resin is injected.
  • the transparent cover 17 has a surface shape in which a downward surface 31 facing downward and an upward surface 33 facing upward appear alternately in the vertical direction.
  • the downward surface 31 is an inclined surface and has a downward angle with respect to the horizontal direction.
  • the upward surface 33 is a horizontal plane.
  • the upward surface 33 connects the lower end of the downward surface 31 positioned on the upper side to the upper end of the downward surface 31 positioned on the lower side.
  • the surface shape is jagged and saw-shaped.
  • the transparent cover 17 has a shape in which a plurality of crests (saw teeth) are arranged in the vertical direction.
  • Each mountain has a downward surface 31 and an upward surface 33.
  • the shape of each peak is a triangle, which makes the surface shape serrated.
  • each transparent cover 17 three ridges are shown in each transparent cover 17 so that the drawing can be easily divided.
  • the distance between the upper and lower light shielding louvers 15 is 8 mm.
  • the LED element 11 has a diameter force of 2 mm.
  • the vertical dimension (width) of the transparent cover 17 is 4 mm. In this case, eight peaks are suitably provided on the transparent cover 17.
  • the downward surface 31 is formed of a concave curved surface. As will be described later, this configuration contributes to reduction of reflection unevenness.
  • the surface of the transparent cover 17 has an antireflection layer (Anti Reflection).
  • the configuration of the display device 1 according to the present embodiment has been described above.
  • the above-described configuration is repeated in the horizontal direction and the vertical direction, whereby the entire display device 1 is configured. It is made.
  • sunlight is assumed as outside light L. Sunlight is incident obliquely upward.
  • the viewing direction V is assumed to be obliquely downward.
  • the external light L passes under the light shielding louver 15 and is irradiated on the surface of the transparent cover 17. A part of the external light L is reflected by the upward surface 33 and becomes the upward reflected light L1. A part of the external light L is reflected by the downward surface 31 and becomes reflected light L2 directed downward from the viewing direction V. In this way, the external light L is reflected in a direction that does not affect the viewer. Therefore, the external light reflected toward the viewer is reduced and the black level is high! ⁇ Contrast images can be obtained.
  • the light blocking louver blocks the LED itself with external light power.
  • a light shielding louver 15 is provided.
  • a waterproof transparent cover 17 is disposed in front of the LED element 11.
  • the height of the light shielding louver 15 is not sufficient to block outside light to the transparent cover 17. As a result, outside light hits the transparent cover 17.
  • the height of the light blocking LUN 15 is limited. For this reason, it is difficult to prevent the light shielding louver 15 from irradiating the transparent cover 17 with external light.
  • the transparent cover 17 has the saw-shaped surface shape as described above. Thereby, the influence of reflection of external light on the transparent cover 17 can be reduced, and the image quality can be effectively improved.
  • the configuration having the saw shape of this embodiment is also applicable to the display device 1.
  • the surface shape of the transparent cover 17 may be configured by one downward inclined surface. However, in this case, the forward projecting amount of the cover becomes large. Then, the viewing angle when viewing the display device 1 from an oblique lateral direction is narrowed. On the other hand, this embodiment is advantageous in that a wider viewing angle can be secured.
  • the downward surface 31 of the transparent cover 17 is a concave curved surface. As described below, the effect of reducing reflection unevenness can be obtained.
  • FIG. 6 shows a plurality of transparent covers 17 arranged in the vertical direction, along with the amount of reflection of the external light from the lower side in the visual recognition direction.
  • the angle of the transparent cover 17 in the longitudinal sectional view is the cover installation angle.
  • the plurality of transparent covers 17 are designed to have the same cover installation angle. However, the cover installation angle may be slightly different between the transparent covers 17 due to the warp of the entire cover (see Fig. 4).
  • the downward surface 31 of the transparent cover 17 is flat.
  • the amount of reflection of external light from below in the visual recognition direction varies depending on the cover installation angle.
  • the amount of reflected light of some of the transparent covers 17 is greater than that of the surrounding transparent covers 17, and uneven reflection may occur.
  • the amount of reflected light of one transparent cover 17 is higher than the upper and lower transparent covers 17 (dotted line).
  • Such unevenness of reflection is conspicuous even if the amount of reflected light is not large! In particular, unevenness in dark parts tends to be noticeable.
  • the transparent cover 17 has a strip shape that is long in the lateral direction. As a result, uneven reflection appears as a horizontal stripe, and the image quality deteriorates.
  • the downward surface 31 is formed of a concave curved surface. That is, the angle of the downward surface 31 gradually changes.
  • the strong reflection that becomes a problem occurs in a part of the concave curved surface.
  • This strong reflection appears in the same way in a plurality of transparent covers 17 adjacent to each other up and down. That is, it is possible to avoid an increase in the amount of reflection in the viewing direction only with some transparent covers 17. Therefore, reflection unevenness can be reduced.
  • the appearance of horizontal stripes can be avoided, the brightness can be made uniform, and the image quality can be improved.
  • the downward surface 31 and the upward surface 33 are repeatedly provided on the transparent cover 17, thereby reducing the influence of the external light from the upward force and reducing the surface shape downward.
  • the uneven reflection of external light due to the downward force caused by the provision of the cut surface 31 is also reduced by the curved surface configuration provided on the downward surface 31.
  • the downward surface 31 is a concave curved surface. Therefore, even if it compares with a convex curved surface, reflection of external light can be reduced to a visual recognition direction.
  • an antireflection layer is provided on the surface of the transparent cover 17.
  • the antireflection layer may have a conventional configuration. By providing the antireflection layer, the influence of external light reflection can be further reduced.
  • the display device 1 according to the embodiment of the present invention has been described above. According to the present embodiment, since the transparent cover 17 has a surface shape in which the downward surface 31 and the upward surface 33 appear alternately, the external light reflected in the viewing direction by the transparent cover 17 can be reduced, and the bright environment Even underneath, high-contrast display with black sinking can be performed, improving image quality.
  • the downward surface 31 faces obliquely downward (is an inclined surface inclined downward with respect to the horizontal plane) and is formed of a curved surface.
  • the display device 1 is provided with the downward surface 31 and the upward surface 33 repeatedly provided on the transparent cover 17, thereby reducing the influence of the external light from the upward force and providing the surface 31 with the downward surface 31.
  • the reflection unevenness of the external light caused by the downward force is also reduced by the curved surface configuration.
  • the downward surface 31 is a concave curved surface.
  • an antireflection layer is provided on the surface of the transparent cover 17, so that reflection of external light can be further reduced and image quality can be improved.
  • the transparent cover 17 is divided into a plurality of surfaces, and each of the plurality of surfaces reflects incident light in a direction different from the viewing direction.
  • the direction or angle of each divided surface is changed sequentially, and the directions of adjacent divided surfaces are alternately changed.
  • the display device according to the present invention has the effect that the external light reflected in the viewing direction by the transparent cover in front of the light emitting element can be reduced, and the image quality can be improved. It is useful as a display device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

Dispositif d'affichage (1) comportant des éléments (11) émetteurs de lumière disposés dans des directions verticale et latérale et des caches transparents (17) placés devant les éléments (11) émetteurs de lumière. Chaque cache transparent (17) présente une structure de surface comportant des surfaces orientées vers le bas (31) et des surfaces orientées vers le haut (33) disposées en alternance dans la direction verticale. Les caches transparents (17) placés devant les éléments (11) émetteurs de lumière permettent de réduire les réflexions de la lumière extérieure dans une direction d'observation et d'améliorer ainsi la qualité d'image. Les surfaces orientées vers le bas (31) sont inclinées par rapport au plan horizontal et prennent la forme de surfaces incurvées susceptibles de réduire les réflexions irrégulières.
PCT/JP2006/315526 2006-08-04 2006-08-04 Dispositif d'affichage Ceased WO2008015762A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2006/315526 WO2008015762A1 (fr) 2006-08-04 2006-08-04 Dispositif d'affichage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2006/315526 WO2008015762A1 (fr) 2006-08-04 2006-08-04 Dispositif d'affichage

Publications (1)

Publication Number Publication Date
WO2008015762A1 true WO2008015762A1 (fr) 2008-02-07

Family

ID=38996950

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2006/315526 Ceased WO2008015762A1 (fr) 2006-08-04 2006-08-04 Dispositif d'affichage

Country Status (1)

Country Link
WO (1) WO2008015762A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT13474U1 (de) * 2012-05-15 2014-01-15 Forster Verkehrs Und Werbetechnik Gmbh Videopaneel
US8929083B2 (en) 2013-03-16 2015-01-06 ADIT Media, LLC Compound structural frame and method of using same for efficient retrofitting
JP2015118120A (ja) * 2013-12-16 2015-06-25 日亜化学工業株式会社 表示装置の製造方法
JP2016095464A (ja) * 2014-11-17 2016-05-26 三菱電機株式会社 映像表示装置及び映像表示装置の製造方法
US9761157B2 (en) 2013-03-16 2017-09-12 Adti Media Llc Customized sectional sign assembly kit and method of using kit for construction and installation of same
US9852666B2 (en) 2013-03-16 2017-12-26 Adti Media Llc Full height sectional sign assembly and installation kit and method of using same
WO2018116101A1 (fr) * 2016-12-23 2018-06-28 Bematrix Bvba Module d'affichage pour un kiosque d'exposition temporaire
US10210778B2 (en) 2013-03-16 2019-02-19 Adti Media Llc Sign construction with sectional sign assemblies and installation kit and method of using same
US10741107B2 (en) 2013-12-31 2020-08-11 Ultravision Technologies, Llc Modular display panel
US10891881B2 (en) 2012-07-30 2021-01-12 Ultravision Technologies, Llc Lighting assembly with LEDs and optical elements

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0588621A (ja) * 1991-09-30 1993-04-09 Toshiba Lighting & Technol Corp 表示装置
JPH0588623A (ja) * 1991-09-30 1993-04-09 Toshiba Lighting & Technol Corp 表示装置
JPH11305685A (ja) * 1998-04-23 1999-11-05 Nec Eng Ltd Ｌｅｄ表示盤
JP2000112388A (ja) * 1998-10-02 2000-04-21 Stanley Electric Co Ltd 屋外用ｌｅｄ表示素子
JP2001083893A (ja) * 1999-09-10 2001-03-30 Matsushita Electric Ind Co Ltd Ｌｅｄ集合体表示装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0588621A (ja) * 1991-09-30 1993-04-09 Toshiba Lighting & Technol Corp 表示装置
JPH0588623A (ja) * 1991-09-30 1993-04-09 Toshiba Lighting & Technol Corp 表示装置
JPH11305685A (ja) * 1998-04-23 1999-11-05 Nec Eng Ltd Ｌｅｄ表示盤
JP2000112388A (ja) * 1998-10-02 2000-04-21 Stanley Electric Co Ltd 屋外用ｌｅｄ表示素子
JP2001083893A (ja) * 1999-09-10 2001-03-30 Matsushita Electric Ind Co Ltd Ｌｅｄ集合体表示装置

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT13474U1 (de) * 2012-05-15 2014-01-15 Forster Verkehrs Und Werbetechnik Gmbh Videopaneel
US10891881B2 (en) 2012-07-30 2021-01-12 Ultravision Technologies, Llc Lighting assembly with LEDs and optical elements
US10210778B2 (en) 2013-03-16 2019-02-19 Adti Media Llc Sign construction with sectional sign assemblies and installation kit and method of using same
US8929083B2 (en) 2013-03-16 2015-01-06 ADIT Media, LLC Compound structural frame and method of using same for efficient retrofitting
US9761157B2 (en) 2013-03-16 2017-09-12 Adti Media Llc Customized sectional sign assembly kit and method of using kit for construction and installation of same
US9852666B2 (en) 2013-03-16 2017-12-26 Adti Media Llc Full height sectional sign assembly and installation kit and method of using same
JP2015118120A (ja) * 2013-12-16 2015-06-25 日亜化学工業株式会社 表示装置の製造方法
US10741107B2 (en) 2013-12-31 2020-08-11 Ultravision Technologies, Llc Modular display panel
JP2016095464A (ja) * 2014-11-17 2016-05-26 三菱電機株式会社 映像表示装置及び映像表示装置の製造方法
BE1025102B1 (nl) * 2016-12-23 2018-10-30 Bematrix Bvba Weergavemodule voor een tijdelijke tentoonstellingsstand
EP3757442A1 (fr) * 2016-12-23 2020-12-30 Bematrix BVBA Module d'affichage pour un kiosque d'exposition temporaire
WO2018116101A1 (fr) * 2016-12-23 2018-06-28 Bematrix Bvba Module d'affichage pour un kiosque d'exposition temporaire
US11158216B2 (en) 2016-12-23 2021-10-26 Bematrix Bvba Display module for a temporary exhibition stand

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