EP0889457B1 - "Panneau d'affichage lumineux" - Google Patents
"Panneau d'affichage lumineux" Download PDFInfo
- Publication number
- EP0889457B1 EP0889457B1 EP98401636A EP98401636A EP0889457B1 EP 0889457 B1 EP0889457 B1 EP 0889457B1 EP 98401636 A EP98401636 A EP 98401636A EP 98401636 A EP98401636 A EP 98401636A EP 0889457 B1 EP0889457 B1 EP 0889457B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- display panel
- light
- optical filter
- emitting elements
- panel according
- 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.)
- Expired - Lifetime
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Images
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
- G09F9/33—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 panels luminous display, and in particular to those of these panels comprising an opaque bottom having a front face dark in color with a plurality of light elements, this front face as well as the light elements being covered by a front optical filter.
- Document FR-A-2 638 271 describes an example of a such a luminous display panel, in which the filter front optic is roughly the same color as the light elements.
- an additional optical filter is interposed between the front optical filter and the opaque background, this filter additional optics having a complementary color of the color of the front optical filter and being pierced with holes in correspondence with the light elements.
- This known display panel gives all satisfaction, since it is very readable, even when it is in full sun, thanks to the high contrast obtained between the light elements and the opaque background.
- the object of the present invention is in particular to alleviate these disadvantages.
- a display panel of the genre in question is essentially characterized in that the front optical filter is an absorbent filter substantially neutral, which has a coefficient of transmission between 10 and 60% on substantially the whole visible spectrum of light, the display panel having no other optical filter interposed between the bottom of the display panel and said optical filter frontal.
- a panel is obtained display which always has excellent visibility, by allowing a significant contrast between the elements bright and opaque background, and moreover, this panel display may lend itself to display if necessary in color, and it is less expensive than the panels aforementioned known display panels.
- Figure 1 shows an example of a display panel luminous 1 according to the invention, which in this case can be implemented in urban areas to disseminate information with road users.
- the invention is not limited to this special type of light display, but includes otherwise all types of illuminated display panels intended to be installed in particular in the open air and / or in public places (public roads in urban areas, road or motorway, airports, stations, etc ...), to disseminate information for example or advertising messages.
- the display panel 1 includes a front face 2 transparent, which is constituted in this case by a brown optical filter which covers sets 3 of light elements arranged on the face before an opaque background 4.
- the sets 3 light elements each consist of a plurality light elements 5, for example light-emitting diodes, which can be carried by the bottom 4, which bottom 4 is then advantageously constituted by a printed circuit board 6 which is adapted to supply electrically each of the light-emitting diodes 5.
- the front face of the plate 6, that is to say the face of this plate which is oriented towards filter 2, is dark color, advantageously black.
- the bottom 4 could include not only plate 6 of printed circuit, but still a cover 7 pierced with holes 8 in correspondence with the light-emitting diodes 5, or in correspondence with the sets 3 of light-emitting diodes.
- the front face of the cover 7, that is to say the face of this cover which is oriented towards the filter 2 is dark in color, advantageously black, and the printed circuit board 6 can optionally be any color.
- the light-emitting diodes 5 emit light mainly at a peak in length wave located for example between 500 and 650 nm, and advantageously located at approximately 590 nm (yellow light).
- light emitting diodes 5 may be AlInGaP technology diodes, commercially available in particular by the company TOSHIBA under the reference S4E38XX.
- the optical filter 2 is a filter substantially neutral absorbent, i.e. absorbing light over the entire visible spectrum, and more particularly which transmits from 10 to 60%% of the light that it receives over substantially the entire visible spectrum of light (400 nm-800 nm).
- the optical filter 2 could be that marketed under the reference PLEXIGLAS GS UMBRA 806 by the company ROHM.
- the coefficient of transmission ⁇ of this particular filter is between about 12 and 40% for wavelengths ⁇ of light ranging from 400 to 800 nm.
- the contrast is not more than 3.5, and the display panel is unreadable.
Description
- il est bien adapté pour des éléments lumineux monochromes, mais se prête mal à un affichage en plusieurs couleurs,
- et le filtre optique supplémentaire est relativement coûteux, dans la mesure où il doit être percé de trous.
- le coefficient de transmission du filtre frontal est compris entre 12 et 40 % % sur sensiblement tout le spectre visible de la lumière ;
- le filtre optique frontal est de couleur marron;
- les éléments lumineux sont adaptés pour émettre de la lumière principalement à une longueur d'onde comprise entre 500 et 650 nm ;
- la face avant du fond opaque est noire ;
- le fond est constitué par une plaque qui porte les éléments lumineux et qui forme un circuit électrique d'alimentation de ces éléments lumineux ;
- le fond comporte un cache percé de trous qui sont disposés en correspondance avec les éléments lumineux, ce cache formant la face avant du fond.
- la figure 1 est une vue schématique montrant un exemple de panneau d'affichage lumineux selon l'invention,
- la figure 2 est une vue partielle en coupe montrant l'intérieur du panneau d'affichage de la figure 1, selon une première forme de réalisation de l'invention,
- la figure 3 est une vue similaire à la figure 2, pour une deuxième forme de réalisation de l'invention,
- et la figure 4 représente un exemple de spectre d'absorption du filtre optique frontal appartenant au panneau d'affichage de la figure 1.
Claims (7)
- Panneau d'affichage lumineux, comprenant un fond opaque (4) qui présente une face avant de couleur sombre dotée d'une pluralité d'éléments lumineux (5), cette face avant ainsi que les éléments lumineux étant recouverts par un filtre optique frontal (2),
caractérisé en ce que le filtre optique frontal (2) est un filtre absorbant sensiblement neutre, qui présente un coefficient de transmission compris entre 10 et 60 % sur sensiblement tout le spectre visible de la lumière, le panneau d'affichage ne comportant pas d'autre filtre optique interposé entre le fond et ledit filtre optique frontal. - Panneau d'affichage selon la revendication 1, dans lequel le coefficient de transmission du filtre frontal (2) est compris entre 12 et 40 % sur sensiblement tout le spectre visible de la lumière.
- Panneau d'affichage selon l'une quelconque des revendications 1 et 2, dans lequel le filtre optique frontal (2) est de couleur marron.
- Panneau d'affichage selon l'une quelconque des revendications précédentes, dans lequel les éléments lumineux (5) sont adaptés pour émettre de la lumière principalement à une longueur d'onde comprise entre 500 et 650 nm.
- Panneau d'affichage selon l'une quelconque des revendications précédentes, dans lequel la face avant du fond opaque (4) est noire.
- Panneau d'affichage selon l'une quelconque des revendications précédentes, dans lequel le fond (4) est constitué par une plaque (6) qui porte les éléments lumineux (5), et qui forme un circuit électrique d'alimentation de ces éléments lumineux.
- Panneau d'affichage selon l'une quelconque des revendications 1 à 6, dans lequel le fond comporte un cache (7) percé de trous (8) qui sont disposés en correspondance avec les éléments lumineux (5), ce cache formant la face avant du fond (4).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9708505 | 1997-07-04 | ||
FR9708505A FR2765712B1 (fr) | 1997-07-04 | 1997-07-04 | Panneau d'affichage lumineux |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0889457A1 EP0889457A1 (fr) | 1999-01-07 |
EP0889457B1 true EP0889457B1 (fr) | 2001-04-11 |
Family
ID=9508875
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98401636A Expired - Lifetime EP0889457B1 (fr) | 1997-07-04 | 1998-07-01 | "Panneau d'affichage lumineux" |
Country Status (6)
Country | Link |
---|---|
US (1) | US6118210A (fr) |
EP (1) | EP0889457B1 (fr) |
DE (1) | DE69800682T2 (fr) |
ES (1) | ES2157646T3 (fr) |
FR (1) | FR2765712B1 (fr) |
PT (1) | PT889457E (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3576859B2 (ja) * | 1999-03-19 | 2004-10-13 | 株式会社東芝 | 発光装置及びそれを用いたシステム |
GB2359580B (en) * | 2000-02-26 | 2003-12-10 | Agd Systems Ltd | Traffic signal |
EP2597634B1 (fr) * | 2011-11-25 | 2014-02-26 | SkiData AG | Dispositif d'affichage |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3736050A (en) * | 1970-07-27 | 1973-05-29 | Ato Inc | High contrast filter for visual displays down-converting otherwise blocked radiation |
US4142126A (en) * | 1978-03-06 | 1979-02-27 | Wagner Electric Corporation | Vacuum fluorescent display having uniform character brightness |
CH640966A5 (en) * | 1979-10-06 | 1984-01-31 | Zettler Elektro Apparate Ag | LED arrangement for large-scale display of information |
FR2638271B1 (fr) * | 1988-10-21 | 1990-12-28 | Soc Et Dev Prod Electron | Tableau d'affichage a elements lumineux |
DE4225140A1 (de) * | 1992-07-30 | 1994-02-03 | Pintsch Bamag Ag | Phantomlichtminderung von Leuchtdioden |
-
1997
- 1997-07-04 FR FR9708505A patent/FR2765712B1/fr not_active Expired - Fee Related
-
1998
- 1998-07-01 EP EP98401636A patent/EP0889457B1/fr not_active Expired - Lifetime
- 1998-07-01 ES ES98401636T patent/ES2157646T3/es not_active Expired - Lifetime
- 1998-07-01 DE DE69800682T patent/DE69800682T2/de not_active Expired - Fee Related
- 1998-07-01 PT PT98401636T patent/PT889457E/pt unknown
- 1998-07-01 US US09/114,237 patent/US6118210A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US6118210A (en) | 2000-09-12 |
FR2765712A1 (fr) | 1999-01-08 |
PT889457E (pt) | 2001-09-28 |
EP0889457A1 (fr) | 1999-01-07 |
DE69800682D1 (de) | 2001-05-17 |
FR2765712B1 (fr) | 1999-09-17 |
ES2157646T3 (es) | 2001-08-16 |
DE69800682T2 (de) | 2001-11-22 |
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