EP1313985A2 - Optique auxiliaire pour panneaux video a led de plein air - Google Patents

Optique auxiliaire pour panneaux video a led de plein air

Info

Publication number
EP1313985A2
EP1313985A2 EP01964714A EP01964714A EP1313985A2 EP 1313985 A2 EP1313985 A2 EP 1313985A2 EP 01964714 A EP01964714 A EP 01964714A EP 01964714 A EP01964714 A EP 01964714A EP 1313985 A2 EP1313985 A2 EP 1313985A2
Authority
EP
European Patent Office
Prior art keywords
light
light guide
guide rods
lens system
exit
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.)
Withdrawn
Application number
EP01964714A
Other languages
German (de)
English (en)
Inventor
Alexander Otto
Harald Swatek
Alexander Swatek
Alexander Swarovski
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.)
Sunamic Visualisierung und Netzwerk GmbH
Original Assignee
Sunamic Visualisierung und Netzwerk GmbH
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 Sunamic Visualisierung und Netzwerk GmbH filed Critical Sunamic Visualisierung und Netzwerk GmbH
Publication of EP1313985A2 publication Critical patent/EP1313985A2/fr
Withdrawn legal-status Critical Current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
    • G09F9/33—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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/72—Modifying the appearance of television pictures by optical filters or diffusing screens
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/30—Picture reproducers using solid-state colour display devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof

Definitions

  • sun visors in the form of horizontal slats are arranged close above the LED rows or small, curved screens above LED groups combined into pixels.
  • these can only be kept relatively short, because otherwise sufficient viewing angles cannot be realized for the audience. So there is no real improvement, especially when the sun is low.
  • LEDs have two metal feet, which are used for power supply, heat dissipation and above all for fastening and positioning.
  • the LEDs must be aligned very precisely, since positional or angular deviations are negatively noticeable due to singular light or dark spots or irregular brightness in the image.
  • the LEDs must be protected against moisture.
  • they are usually cast with a black-colored casting resin, but windscreens are also still used.
  • the object of the invention was to develop a video panel with LED, which has no sun reflection effects.
  • cheaper and more precisely processed LED designs suitable for SMD technology should be able to be used, whereby the achievement of a favorable light distribution should be taken over by suitable front optics, so that application-specific radiation characteristics can also be generated independently of the LED manufacturer.
  • a light guide rod is arranged directly in front of each LED, the light entry surface of which essentially corresponds to the usable light exit of the LED, the cross-sectional profile and orientation with respect to the LED of which is dimensioned such that, on the one hand, the entire incoming useful light according to known optical laws through total reflection is passed on to the walls and is deflected or bundled in a suitable manner and, after passing through the exit area, illuminates the observation area with a predetermined distribution characteristic, but on the other hand sun rays incident from above the observation area cannot exit through the light entry area into the light source and either after multiple total reflections in the direction of incidence or outside of the observation area, or at a steeper angle than the critical angle of total reflection hit the walls of the light guide rod and exit there, and the exit surface of which has such a vertical inclination that at any position of the sun Sun rays reflected on the surface do not fall into the observation area.
  • the critical angle of total reflection is used to separate the useful light rays from the sun's rays using the different vertical inclinations by reflecting one beam at the boundary surfaces of the light guide rod and allowing the others to pass through become.
  • the sun shines from every angle above the horizon, but the observation of such a video panel is usually more or less from below, so that the observation area extends from the horizon to about 30 or 40 degrees downwards and therefore there is no overlap. Laterally, the viewing angle is usually much larger, at least +/- 60 degrees. However, closer observation areas are also desired, for example when used in traffic engineering.
  • FIG. 1 shows an elevation and plan view of a simple embodiment
  • FIG. 2 shows another embodiment in vertical section
  • FIGS. 3a and 3b constructive embodiments of the invention in view and sectional views
  • FIG. 4 shows another embodiment in elevation and plan view
  • 5 shows another embodiment in vertical section
  • FIG. 6 shows an explanation for achieving a uniform light distribution.
  • Fig. 1 shows the invention in its simplest execution in plan and elevation.
  • LED 2 in SMD construction sit on a common circuit board 1. These usually emit their useful light approximately in a hemisphere shape.
  • a light guide rod 3 with a rectangular cross-section and a flat light entry surface 4, which is made of the LED 2 emerging light captured as completely as possible and breaks according to the optical laws to the plumb.
  • the light is then totally reflected in a known manner on the polished walls 5 practically without loss, provided that it strikes at a slower angle than the material-specific critical angle of the total reflection.
  • the walls 5 diverge conically, as a result of which the light is concentrated in the vertical direction and leaves the light guide rod 3 at the exit surface 6 with simultaneous refraction from the plumb line and shines into the observation area B.
  • the exit surface 6 is inclined downward by the angle A.
  • the light distribution within the observation area B and its vertical size and position can be influenced with the length of the light guide rod 3 and the inclination of the walls 5 and the exit surface 6.
  • the inclination A is fixed in such a way that a sunbeam 7 incident from any angle always comes under the observation area B after the surface reflection 7a at the exit surface 6.
  • the sunbeam 7 incident from a flat angle is refracted to the perpendicular at the exit surface 6 and, after the wall 5, where it is totally reflected, reaches the entrance surface 4, where total reflection takes place again. It can therefore not get into the LED and, after two total reflections, it leaves the light guide rod 3 in the original direction of incidence 7b.
  • this property of vertical retro reflection only occurs with a certain geometry of the light guide rod 3 and low position of the sun.
  • the walls 5 must be flat and have a right angle between the entrance surface 4 and the upper wall 5.
  • a sunbeam 8 already hits a wall 5 so steeply that it emerges laterally from the light guide rod as beam 7c.
  • the laterally emerging sun rays 7c strike a housing 9 made of black matt plastic and completely surround the walls 5 of the light guide rod 3 and are absorbed.
  • the housing 9 has extensions 10 which center the LED 2 or the circuit board 1 exactly with respect to the light guide rod 3.
  • the floor plan shows that the LEDs 2 are arranged in groups of three, each of which contains a red, green and blue LED and thus together form a pixel.
  • the light guide rod 3 has parallel walls 5, as a result of which the useful light experiences no change in angle due to the total reflection, it emerges from the exit surface 6 with a horizontal distribution similar to that of the LED 2 itself, as a result of which a large horizontal angle of the observation area B is achieved.
  • Inclined sun rays 7 cannot leave the light guide rod 3 from the side and are totally reflected on all sides until they hit the upper or lower wall 5 sufficiently steeply and can exit there or leave the light guide rod 3 again through the exit surface 6.
  • any other groupings as well as single LEDs for single-color displays can also be provided.
  • the printed circuit board 1 is parallel to the inclined exit surface 6. Any number of LED rows with a common printed circuit board 1 can be placed obliquely one above the other, the exit surface results in a continuous surface inclined by the angle A. This design is also particularly suitable for platform displays.
  • Fig. 2 shows LED rows arranged one above the other in steps.
  • the geometry of the light guide rod is changed so that the circuit board 1 and the entry surface 4 are substantially vertical or slightly inclined in front.
  • the exit surfaces 6 are connected by inclined steps 11, the inclination of which is selected such that surface reflections of the sun rays 7a cannot fall into the observation area B.
  • the penetrating sun rays are either passed on in the front surface 13 until they emerge at step edges 12, or they exit through the walls 5 of the light guide rods 3 and are absorbed by the housing 9.
  • 3a shows that the systems described can in principle be produced as components for individual pixels, the light guide rods 3 in each case being connected in one piece by a common front plate 13 and the housing 9 likewise forming a one-piece structure which consists of an elastic-plastic plastic and is tightly pressed into a metal matrix plate 17 with a suitable hole pattern in a known manner and design.
  • the common circuit board 1 is centered and held by extensions 10 of the housing 9. The advantage of this design is to be able to produce any grid, only the circuit board 1 having to be changed.
  • 3b shows the combination of the individual optics into arbitrarily larger units, again all light guide rods 3 being connected in one piece by a common front surface 13 and the housings 9 likewise forming a one-piece structure that can be pushed on from behind.
  • the front surface 13 can have a circumferential flange 14, which is used to seal the LED 2 and the interior by means of the printed circuit board 1.
  • the components are designed in such a way that simple demoulding and seamless stringing together are possible.
  • the advantage of this version is the greater economy with a given grid.
  • Fig. 4 shows in elevation and plan an embodiment of the invention in an endless construction.
  • the function corresponds exactly to FIG. 2 in elevation, the individual light guide rods 3 are replaced by a horizontally lying, extruded endless profile with the same vertical cross-section.
  • the height of the profile or the number of light guide cross sections can be freely selected.
  • the LED 2 therefore radiates its useful light from the side unhindered without reflections.
  • the horizontal light distribution in the observation area B therefore corresponds exactly to the light distribution of the LED 2 itself and can only be slightly influenced by structures on the exit surface 6. However, the sun's rays are reflected or absorbed in the same way as in FIG. 1 or 2.
  • the housing 9 is also an endless profile here, which is fastened in the optical profile.
  • the display panel is created here by arranging a corresponding number of horizontal profiles one above the other through a suitable design of the flange 14.
  • Fig. 6 shows this fact clearly.
  • the mirror images 4a of the entrance surface 4 adjoin one another without gaps in the case of an assumed rectangular cross section.
  • An off-center light entry 15 also occurs asymmetrically in the mirror images as 15a.
  • a light exit surface 6 with the same width of the entry surface 4 could possibly show no light entry at certain positions, and several light entries 15a at another location, which results in a considerable inhomogeneity of the appearance.
  • the exit surface 6a here extends over exactly 2 lateral and 4 vertical images 4a of the entrance surface 4.
  • the movement of the viewer can be interpreted as shifting the exit surface 6a over the arrangement of the images 4a of the entrance surface 4.
  • the geometry of the light guide rod 3 can actually be chosen such that the width and height of the exit surface 6 are an even multiple of the width and height of the entry surface 4, the light guide rod 3 then essentially forms an obtuse Cone.
  • it can also be achieved with an approximately parallel light guide rod 3, as in the plan view of FIG. 1, by means of a suitable attachment lens 16 that exactly two images 4a of the entrance surface 4 are shown in the width of the exit surface 6.
  • diverging walls 5 of the light guide rod 3 should also be provided in the plan of FIG. 1.
  • these can also be angled or curved in multiple axes or have a certain surface structure in order to adapt the light more precisely to the observation area B or to achieve a more uniform light progression.
  • Light entry and exit surfaces 4 and 6 can also have curvatures or structures to a limited extent, provided that their influence does not impair the overall function. Steps 11 between the exit surfaces 6 have the result that some of the surface reflections 7a can in turn enter the exit surfaces 6 or steps 11.
  • the exit surfaces 6 can also be inclined upwards, the steps 11 downwards.
  • any other light sources can also be provided instead of the LED, for example phosphorescent layers or organic luminescent materials.

Abstract

L'invention concerne un panneau vidéo équipé de LED de type SMD et présentant une optique auxiliaire pour présentation en plein air, laquelle optique améliore la visibilité et le contraste des présentations dans toute condition de rayonnement solaire. Cette optique empêche également toute réverbération et réflexion de la lumière du soleil au niveau de la zone observée et permet simultanément une bonne distribution de la lumière. Un guide de lumière (3) est agencé directement devant chaque LED (2). Le déplacement transversal et l'orientation du guide par rapport aux LED (2) sont déterminés de sorte que, d'un côté, la lumière incidente utile totale est redirigée par réflexion totale vers les parois (5) puis diffractée vers la zone observée et, de l'autre côté, le rayonnement solaire incident (7) n'atteint pas les LED (2), car soit il est redirigé après réflexion totale multiple dans la direction d'incidence ou en dehors de la zone observée (B), soit il atteint les parois (5) du guide de lumière (3) à un angle plus accentué que l'angle limite de la réflexion totale, s'échappe desdites parois puis est absorbé par un logement périphérique (9). De plus, des réflexions surfaciques gênantes sont évitées par l'inclinaison appropriée (A) des surfaces émettrices de lumière (6).
EP01964714A 2000-08-24 2001-08-24 Optique auxiliaire pour panneaux video a led de plein air Withdrawn EP1313985A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT14602000 2000-08-24
AT14602000 2000-08-24
PCT/AT2001/000275 WO2002017628A2 (fr) 2000-08-24 2001-08-24 Optique auxiliaire pour panneaux video a led de plein air

Publications (1)

Publication Number Publication Date
EP1313985A2 true EP1313985A2 (fr) 2003-05-28

Family

ID=3688255

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01964714A Withdrawn EP1313985A2 (fr) 2000-08-24 2001-08-24 Optique auxiliaire pour panneaux video a led de plein air

Country Status (3)

Country Link
EP (1) EP1313985A2 (fr)
AU (1) AU2001285561A1 (fr)
WO (1) WO2002017628A2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT500013B1 (de) * 2003-01-31 2006-10-15 Swarco Futurit Verkehrssysteme Optikelement für wechselverkehrszeichen
EP2226780A1 (fr) * 2009-03-02 2010-09-08 Textmate Limited Affichage électronique d'autoroute
US9171488B2 (en) 2010-03-24 2015-10-27 Siemens Aktiengesellschaft Optical display element and display device
CN104575308A (zh) * 2015-01-06 2015-04-29 刘涵 一种高清晰p5LED户外全彩显示屏
CZ306085B6 (cs) * 2015-07-28 2016-07-27 Eltodo, A.S. Optický prvek

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE142763T1 (de) * 1991-01-16 1996-09-15 Lumitex Inc Dünne plattenleuchte
US5410453A (en) * 1993-12-01 1995-04-25 General Signal Corporation Lighting device used in an exit sign
US6134092A (en) * 1998-04-08 2000-10-17 Teledyne Lighting And Display Products, Inc. Illumination device for non-emissive displays

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0217628A3 *

Also Published As

Publication number Publication date
AU2001285561A1 (en) 2002-03-04
WO2002017628A2 (fr) 2002-02-28
WO2002017628A3 (fr) 2002-07-25

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