EP0762367A1 - Matrixanzeigetafel - Google Patents

Matrixanzeigetafel Download PDF

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Publication number
EP0762367A1
EP0762367A1 EP96401852A EP96401852A EP0762367A1 EP 0762367 A1 EP0762367 A1 EP 0762367A1 EP 96401852 A EP96401852 A EP 96401852A EP 96401852 A EP96401852 A EP 96401852A EP 0762367 A1 EP0762367 A1 EP 0762367A1
Authority
EP
European Patent Office
Prior art keywords
mask
openings
light
display surface
angle
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.)
Granted
Application number
EP96401852A
Other languages
English (en)
French (fr)
Other versions
EP0762367B1 (de
Inventor
Philippe R. Migny
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.)
Securite et Signalisation SAS
Ses Inc
Original Assignee
Securite et Signalisation SAS
Ses Inc
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 Securite et Signalisation SAS, Ses Inc filed Critical Securite et Signalisation SAS
Publication of EP0762367A1 publication Critical patent/EP0762367A1/de
Application granted granted Critical
Publication of EP0762367B1 publication Critical patent/EP0762367B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the present invention relates to the field of the display of variable messages by means of light emitting elements arranged in a matrix on a display surface of a panel.
  • This type of display panel is used in particular for displaying alphanumeric characters or graphic elements, outdoors, on road and motorway networks for example.
  • Contrast can be defined as the ratio of the luminance emitted by the lit panel, on the luminance reflected by the panel off, for a given external illumination.
  • variable message signs intended for road signs are required to provide a contrast at least equal to 10 for an exterior illumination of 40,000 lux, applied at an incidence of 10 ° above the horizon.
  • the length of these visors is in direct relation with the dimension of the pixel and the minimal incidence of the solar rays of which one wants to avoid the reflection by the light emitting elements.
  • the visor length is at least 57mm, if we want to avoid all reflections for the solar rays having an incidence greater than or equal to 10 ° above the horizon.
  • the visors contribute to reduce notably the solar reflections on the light emitting elements, because of their geometry and arrangement, they significantly increase the total surface illuminated by the sun, and, being black in color, like the matter surrounding the pixels, they act as real solar collectors, constituting a significant contribution of calories in the vicinity of the light emitting elements.
  • a display panel exposed to direct sunlight it is possible to reach and even exceed 100 ° C on these black surfaces.
  • Such a temperature is detrimental to the operation of most of the known light emitting elements, such as light-emitting diodes, for example.
  • the purpose of the present invention is to overcome these drawbacks, by dissociating the support of the light-emitting elements and the means intended to intercept the sun's rays and by providing a chimney between the display surface and said means, which makes it possible to improve significantly the efficiency of forced air circulation if necessary.
  • the invention therefore relates to a display panel of the type comprising a plurality of light-emitting elements arranged in a matrix on a vertical display surface and means for preventing the sun's rays from directly striking said light-emitting elements of a minimum incidence given in a vertical plane, while allowing an observer to see the image formed by said light emitting elements at an observation angle less than a given maximum observation angle.
  • This display panel is characterized in that the said means consist of a mask placed in front of the display surface and at a distance from the latter, the said mask having a vertical wall parallel to the display surface, which has a plurality openings each disposed opposite a light emitting element, said openings being dimensioned and positioned with respect to the light emitting elements so that the light emitted by the latter is visible to an observer who looks at said panel from an angle observation angle less than the given maximum observation angle, and further comprising a plurality of fins directed towards the display surface and intended to at least partially intercept the solar rays passing through said openings, so that the elements light emitters are not struck by the sun's rays at an angle of incidence greater than the ang the minimum incidence.
  • the vertical wall of the mask intercepts most of the solar radiation which strikes the panel, and the fins also intercept most of the solar radiation which passes through the openings. Only a very small portion of solar radiation strikes the display surface between the light emitting elements for medium or strong incidences.
  • the free ends of the fins are distant from the display surface. This arrangement makes it possible to significantly improve the possible forced air circulation which takes place in the chimney separating the display surface and the fins and in the chimney separating the mask and the transparent protective wall forming the front face of the panel. . In any event, the accumulation of calories takes place in the mask and does not disturb the normal functioning of the light-emitting elements.
  • the apertures have a square or rectangular cross-section and the fins extend from the lower areas of the apertures to the display surface at an angle at least equal to the given maximum viewing angle.
  • the mask is produced by cutting and folding a sheet metal plate.
  • FIG. 1 shows a known display panel 1 of variable messages, which comprises a plurality of light emitting elements 2 arranged in a matrix, that is to say in rows and columns, on a display surface 3 which may for example be the visible front face of a support 4 on which the light emitting elements 2 are mounted.
  • This display panel 1 is intended to be used outdoors, for example on a road, in order to provide road users with variable information messages consisting of alphanumeric characters or graphic elements.
  • variable information to be displayed is obtained by the emission of light from elements 2 light emitters selected by a control system of known type, and not shown in the drawing.
  • a visor 5 is associated with each element 2 light emitter. This visor 5 extends towards the front of the panel 1 and is fixed to the support 4 immediately above the corresponding element 2.
  • the reference 6 represents a transparent protective plate forming the front face of the display panel 1 and located at a distance from the ends 7 of the visors 5.
  • the length L of the visors 5 is a function of the dimension of the light emitting elements 2. If the latter have a diameter of 10mm, the length L is at least equal to 57mm, so that the light rays which have an incidence greater than 10 ° cannot directly strike the elements 2.
  • each light emitting element 2 is thus subjected to strong heating, the visors 5 fixed to the support 4 forming thermal bridges.
  • the object of the present invention is to ensure that these areas are more weakly sunny for similar display surface arrangements.
  • FIG. 2 shows an embodiment of the invention.
  • the display panel 11 according to the invention comprises a plurality of light emitting elements 2 arranged in a matrix on a vertical display surface 3 which may be the visible front face of a support 4 of said elements 2.
  • a transparent plate 6 On the before the panel 11, there is also provided a transparent plate 6 forming the vertical front face of the display panel 1.
  • a mask 12 is provided, consisting of a sheet metal which has a plurality of openings 13 of rectangular or square shape, each facing a light-emitting element 2, and a plurality of fins 14, each directed from the lower edge 15 of an opening 13 towards the region 16 of the display surface 3 located immediately below the light emitting element 2 corresponding to said opening 13.
  • each opening 13 is situated in a horizontal plane 18 tangent to the upper edge of a light-emitting element 2.
  • the mask 12 is placed at least at a distance L from the display surface 3, such that the sun's rays 8 having an incidence greater than the given minimum incidence (for example 10 °, and passing through a given opening 13, do not can hit the element directly 2 light emitter located opposite said opening 13.
  • This distance L is a function of the dimension of the elements 2, and is at least equal to 57mm, if the elements 2 have, for example, a dimension of 10mm.
  • the height and width of the openings 13 is calculated as a function of the maximum angles A of observation by an observer, in a vertical and horizontal plane. This maximum angle A is for example 10 ° below the horizon. With the previous data, the height of an opening 13 is thus at least 20mm, and the fins 14 are inclined relative to the horizontal by an angle of 10 °.
  • the vertical wall 19 of the mask 12 intercepts three-quarters of the sun's rays 8 which strike the mask 12.
  • the mask 12 is produced from a flat sheet 20 in which slots 21 are made in the shape of a U to make the openings 13 and the delimited areas are folded by these slots to make the fins 14.
  • each fin 14 intercepts a large part of the solar radiation passing through the opening 13 immediately adjacent, in order to protect the light-emitting element 2 located below.
  • the fins 14 having a length of approximately 2 cm, it is found that they intercept all the solar rays 8 passing through the openings 13, when the incidence of these rays is greater than an intermediate angle of incidence M of approximately 45 °.
  • additional vertical fins 14a, 14b on each side of the openings 13, in order to intercept solar rays whose incidence has a component in the horizontal plane 18.
  • These additional fins can extend from a second sheet 21 cut and folded like the sheet 20 constituting the mask 12 described above, but with I-shaped slots, these two sheets then being judiciously juxtaposed in such a way that their openings are in correspondence.
  • a fan 25 is arranged in the lower part of the panel 11.
  • the support 4, the mask 12 and the transparent protective plate 6 are obviously mounted in a frame not shown in the drawings.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)
  • Glass Compositions (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Gas-Filled Discharge Tubes (AREA)
EP96401852A 1995-09-06 1996-08-29 Matrixanzeigetafel Expired - Lifetime EP0762367B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9510427 1995-09-06
FR9510427A FR2738375B1 (fr) 1995-09-06 1995-09-06 Panneau d'affichage a matrice

Publications (2)

Publication Number Publication Date
EP0762367A1 true EP0762367A1 (de) 1997-03-12
EP0762367B1 EP0762367B1 (de) 1999-03-10

Family

ID=9482304

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96401852A Expired - Lifetime EP0762367B1 (de) 1995-09-06 1996-08-29 Matrixanzeigetafel

Country Status (7)

Country Link
US (1) US5749647A (de)
EP (1) EP0762367B1 (de)
AT (1) ATE177552T1 (de)
DE (1) DE69601678T2 (de)
ES (1) ES2129943T3 (de)
FR (1) FR2738375B1 (de)
GR (1) GR3030205T3 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100220487A1 (en) * 2009-02-27 2010-09-02 Hong Kong Applied Science And Technology Research Institute Co. Ltd. Lighting assembly and heat exchange apparatus for uniform heat dissipation
US10966335B2 (en) * 2019-04-29 2021-03-30 Semiconductor Components Industries, Llc Fin frame assemblies

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032222A (en) * 1974-11-25 1977-06-28 Digicourse Inc. Controlled reflection readout for digital displays
EP0016272A1 (de) * 1979-03-26 1980-10-01 Stewart-Warner Corporation Glühlampenanzeigevorrichtung mit eingebauter Sonnenblende

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032222A (en) * 1974-11-25 1977-06-28 Digicourse Inc. Controlled reflection readout for digital displays
EP0016272A1 (de) * 1979-03-26 1980-10-01 Stewart-Warner Corporation Glühlampenanzeigevorrichtung mit eingebauter Sonnenblende

Also Published As

Publication number Publication date
DE69601678D1 (de) 1999-04-15
DE69601678T2 (de) 1999-07-29
GR3030205T3 (en) 1999-08-31
FR2738375A1 (fr) 1997-03-07
EP0762367B1 (de) 1999-03-10
US5749647A (en) 1998-05-12
ES2129943T3 (es) 1999-06-16
FR2738375B1 (fr) 1997-11-21
ATE177552T1 (de) 1999-03-15

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