WO2008138159A1 - Ensemble d'éclairage - Google Patents

Ensemble d'éclairage Download PDF

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Publication number
WO2008138159A1
WO2008138159A1 PCT/CH2008/000214 CH2008000214W WO2008138159A1 WO 2008138159 A1 WO2008138159 A1 WO 2008138159A1 CH 2008000214 W CH2008000214 W CH 2008000214W WO 2008138159 A1 WO2008138159 A1 WO 2008138159A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
plate
led
side led
backlight device
Prior art date
Application number
PCT/CH2008/000214
Other languages
German (de)
English (en)
Inventor
Gerhard Staufert
Ernst Ottiger
Original Assignee
M & M Public Design Ag
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 M & M Public Design Ag filed Critical M & M Public Design Ag
Priority to EP08733835A priority Critical patent/EP2147424A1/fr
Publication of WO2008138159A1 publication Critical patent/WO2008138159A1/fr

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/0409—Arrangements for homogeneous illumination of the display surface, e.g. using a layer having a non-uniform transparency

Definitions

  • the invention relates to the backlighting of light emitting surfaces with LED.
  • the present invention ensures that the front scatter plate of a theoretically arbitrarily large lighting structure, as used for example for advertising or information signs, is so backlit with LED (light emitting diodes) that at a total depth of the lighting structure down to 2 cm the entire front, for example, information mediating or decoratively luminous, scattering plate radiates to its outermost edge towards homogeneous and bright light.
  • the scattering plate is preferably held so that it appears as a structure in appearance, which has no dark, non-luminous frame.
  • a corresponding lighting structure includes 3 plates arranged in parallel: an average 10 to 15 mm thick acrylic light guide plate, a back light diffusely reflecting example white acrylic plate, for example, 3 mm thickness and a front transparent, the desired inscriptions wearing acrylic plate, for example, 5 mm thickness , Between the plates, a minimum air gap must be ensured in each case for perfect functioning of the light guide plate.
  • Such Aulbauten have the disadvantage that they are complicated and the very thick light guide plate because of very heavy and therefore not only expensive but also difficult to handle and can be mounted only with great effort. Above all, however, the achievable homogeneity is obviously dependent on the optical path length, ie, for example, on the width of the structure.
  • the LED in the sense of the beam path additional, for example, lens and / or mirror-like structures downstream of the beam deflection in order to come as close as possible to an ideal radiation characteristics.
  • LEDs whose light is mainly symmetrical, for example 70 ° to 80 ° inclined to the main radiation direction of the LED lamp used. - A -
  • Lumileds “side-emitting LED Luxeon III”, whose spatial radiation characteristics are relatively close to what is needed but are far from sufficient to be used directly in a flat design, ie. without further measures, to produce a sufficient homogeneity.
  • a backlighting device for a scattering plate of a luminous structure has at least one side LED emitting at least 50% of its light in a solid angle range of 50 ° to 100 ° to the perpendicular to its mounting surface.
  • light-damping structures are now present in the beam path from the side LED to the diffusion plate. These have the effect of homogenizing the light emitted by the diffusion plate.
  • Light attenuating structures are structures that affect at least part of the light so that it can not be emitted further ("in the forward direction").
  • the light-attenuating structures are partially absorbent or possibly partially completely absorbent.
  • the absorption rate can become - what like will be discussed in more detail below, may be preferred - change in function of the position.
  • the mounting surface of a side LED is generally defined as the area of the LED intended for application to a carrier; the carrier generally has a planar structure provided for this purpose.
  • the mounting surface may optionally also form (at least) one electrical contact.
  • side LED which emit their light mainly at an angle, for example, approximately perpendicular to the normal of their mounting surface
  • LED such as the Luxeon HI LED understood, which are constructed by the manufacturer for a radiation in which at least 50% of the light, for example, is radiated symmetrically to the normal to the mounting surface of the LED in a solid angle range of 50 ° to 100 ° C.
  • this also includes LEDs which are constructed by the manufacturer such that they have at least 50%. their light in a solid angle range of ⁇ 60 ° to the normal on their mounting surface and are provided with an additional optics for angled, for example, substantially rectangular deflection of the light.
  • a power-side LED is used with a nominal power consumption of 0.5 to 5 watts or more.
  • a forward-emitting (ie, at least 50% of its light in a symmetric solid angle range of up to ⁇ 60 ° radiating) power LED having a nominal power consumption of 0.5 to 5 watts or more with a suitable deflection optics as a side LED can be used.
  • the spatial light distribution generated by such side LEDs must be modified on their way to the information panel carrying the front panel of the lighting structure so that the desired homogeneity of the radiation of the diffusion plate is formed.
  • side LEDs are used whose emission characteristic is symmetrical to the normal.
  • Such have the advantage, together with the measure according to the invention, of causing a homogenized emission characteristic when they are applied to a carrier in an approximately regular grid. But it is also not symmetrical Abstrahl characterizingen conceivable, for example. In function of the azimuth angle elliptical emission characteristics. The anisotropy caused by these can be compensated for by suitable arrangements and / or orientations of the side LEDs.
  • the entire lighting structure By means of the procedure according to the invention, it is made possible for the entire lighting structure to be designed in such a way that it essentially appears as a structure that shines homogeneously to the brim without dark, no light-emitting frame.
  • the spreading plate can extend to the edge;
  • the hood-like structure can be obtained that no other structures are visible to the edge.
  • the substantially homogeneous light distribution is obtained by the inventive method.
  • the attenuating structures can be mounted directly on the side LED as described in more detail below.
  • a carrier element at a distance from the side LED surface, ie in the space between the side LED and the scatter plate, ie the light-attenuating structures can be in the vertical direction (perpendicular to the scatter plate and carrier plate plane) spaced from both the side LED and the diffusion plate.
  • a corresponding carrier element can be any component which holds one or more such damping structures at a defined distance from a carrier of the side LED or to the scatter plate.
  • a support member may be formed as a rod or hood or body which holds a disc acting as a damping structure.
  • the support element should be substantially transparent to light arriving laterally (with respect to the direction perpendicular to the mounting surface).
  • Particularly preferred is the formation of the carrier element as a carrier hat with or without hat brim, which will be discussed in more detail below.
  • a cavity is preferably formed into which the described damping structures protrude with carrier elements and the side LEDs and their function supporting means. That is, preferably, the light from the side LEDs to the scattering plate and possibly also to the light-attenuating structures through the cavity (ie through the air) passed.
  • the scattering plate is preferably substantially plate-shaped with a substantially horizontally-flat top and bottom, so that the underside of the scattering plate is spaced in the vertical direction from the top of the side LEDs and the light-attenuating structures.
  • the distance between side LED and damping structures is significantly smaller than the distance and between damping structures and the underside of the diffusion plate, so that it is ensured that the light-attenuating structures of adjacent LEDs light does not noticeably hinder its spread to the diffusion plate can.
  • a lighting arrangement according to the invention in addition to the backlighting device, also has the scattering plate and, if necessary, means for fixing the same relative to the backlighting device.
  • the scattering plate as a whole may be part of a hood-like, possibly even one-piece structure, whose side walls may be transparent, diffuse scattering or even mirrored.
  • the scattering plate is preferably at least 50%, more preferably at least 60%, possibly even at least 65% translucent. Particularly preferred is a
  • panel-type lighting assemblies according to the prior art in each case have scattering plates (which can be constructed as already described above from an absorbing plate and a light-scattering plate) with a light transmittance of at most approx.
  • FIG. 1 a curve 2
  • the spatial emission characteristic of the Luxeon III LED specified by the manufacturer Lumileds is also shown. It is easy to see that the real LED emits too much light at small solid angles to achieve a homogeneous illumination.
  • FIG. 1b in which the calculated local illuminance parallel to the mounting surface
  • the Luxeon III LED is shown in the distance h arranged plate in function of the distance from the LED.
  • Figure Ib it is apparent that the local intensity peaks map in annular lighter and darker zones on the plate. The described theoretical relationships can be confirmed with simple measurements.
  • the approach with the light emitting mainly to the side LED is useful in connection with the inventive approach.
  • Scatter plate must not be completely homogeneous in order to obtain a perceived by the viewer as homogeneous radiation of light from this scattering plate out.
  • Inhomogeneity of the illumination may be greater, the stronger the diffusion plate the
  • the term "diffusion plate” which is also used in the following refers to a plate which transmits the light with which it is illuminated by the LED used, for example to 25% to 75%, preferably 40% to 75%, diffusely scattered and then radiates with sufficient homogeneity, while the rest of the light is either absorbed or emitted uselessly against the back.
  • this scattering plate may normally also be a carrier of information to be provided by the lighting structure, that is to say, for example, a colored film with lettering and the like.
  • the present invention makes it possible to backlight the front scattering plate theoretically arbitrarily large, light-emitting lighting structures, such as advertising or signs, with their light mainly approximately perpendicular to the normal of their mounting surface emitting LED (light emitting diodes) that at a total depth of the lighting structure down to 2 cm, the entire front, for example, information mediating or decoratively luminous, scattering plate radiates to its outermost edge towards homogeneous and bright light.
  • the scattering plate is preferably held by the lighting structure so that it appears as a structure in appearance, which has no dark, non-luminous frame.
  • the present invention makes it possible to solve the required homogeneous and bright radiation of light with the smallest possible number of LEDs, ie preferably so-called power LEDs, with a nominal power consumption of, for example, 0.5 watts to 5 watts or more, are used.
  • a lighting structure of 1 m 2 in size and, for example, a total depth of less than 5 cm, so, depending on the desired luminosity, for example, with 10 to 50 such LED operable.
  • the present invention makes it possible to ensure that the heat generated by the LED is dissipated to the environment in a very flat construction with the lowest possible thermal resistance.
  • a thermal resistance between the mounting surface of the LED and the surface which dissipates the heat to the environment of less than 20 ° C / watt or better less than 10 ° C / watt feasible.
  • the present invention in conjunction with a particularly preferred structure, makes it possible to ensure in the simplest possible way that at least the electricity-conducting and light-generating parts of the structure are protected from water and dust.
  • the present invention makes it possible to modify the spatial light distribution generated by the outlined side LED on their way to, for example, the information-carrying front panel of the lighting structure so that a sufficiently good homogeneity of the light emission of the scattering plate arises.
  • the homogeneity is sufficiently good when the differences in brightness which occur in the human eye, which occur as far as the outermost edge of the scattering plate, no longer or only very poorly. This is the case, for example, when the decrease in brightness between close, i. For example, in 5 cm distance adjacent faces not greater than at most 30%, better 20%. Between far apart, so for example, at least a few 10 cm apart faces may take place a continuous, not violating the first requirement, decrease in brightness by at most 50%, better by 40%.
  • optical attenuation structures according to the invention represent a modification of the light emission in the desired sense.
  • curve 2 is considered in FIG. 1 as an example of the emission characteristic of a side LED, it can be seen that the major part, namely about 75% of the emitted light lies in a solid angle range of about 60 ° to 100 ° emission angle. This means that those lying in the solid angle range of 0 to 60 ° radiation angle, the, from Figure Ib apparent, disturbing brightness rings on the illuminated plate-generating light components may be attenuated without significant loss of luminous efficiency so far that the disturbing light rings disappear.
  • a first very simple approach to realizing this optical attenuation, just above (i.e., in the direction normal to the mounting surface away from the substrate), of the side LED used is a small, light-opaque, non-light-reflecting, i. for example, a dull blackened metal cover b2w.
  • a small, light-opaque, non-light-reflecting i. for example, a dull blackened metal cover b2w.
  • the Luxeon III Side LED for example, such a cover must have a diameter of approx. 10 to 20 mm in order to absorb the light emitted in the solid angle range of 0 ° to approx. 60 °.
  • a significant improvement is achieved by a uniformly dark gray to black cover with defined light transmission of, for example, 1% to 20% is used.
  • the thus achieved homogeneity of the radiation from the scattered plate illuminated according to the boundary conditions described in the previous section is sufficient in many practical cases.
  • Optimal is a light-damping cover, which is the ring-like
  • the course of the damping characteristic is such that a uniform brightness results as a function of the emission angle of the side LED.
  • a light-attenuating cover which passes in a circular zone in the center with a diameter of, for example, 5 mm, for example, 10% of the light.
  • the permeability for example, from 1% to the largest diameter increases continuously to, for example, 25%.
  • the values given here are for illustration purposes only and vary from side-LED type to side-LED type.
  • cover plates according to the invention can be effected in a surprisingly simple manner, for example by printing corresponding shades of gray on paper or a suitable plastic film by means of a simple ink-jet printing or laser printer.
  • This disorder can be remedied so that, according to a preferred
  • the carrier in this text due to its generally plate-like shape also called "carrier plate” is also covered with corresponding - second - structures for attenuating the light.
  • the carrier in this text due to its generally plate-like shape also called "carrier plate”
  • the carrier plate is also covered with corresponding - second - structures for attenuating the light.
  • you can such structures have a Lichtdämfungsverlauf, which combines a strong light attenuation in the immediate vicinity of the side LEDs with an increasingly weaker towards the outside light attenuation - in the immediate vicinity of the side LED, the support plate is blackened, in increasing distance it is dark gray, light gray, possibly white.
  • the course of this attenuation can also be adapted to the characteristics of side LEDs used, the dimensioning of the lighting structure and the arrangement of the side LEDs.
  • a damping characteristic by the brim of one of the aforementioned hat-like structure is chosen large enough - eg. With a diameter of at least 5 cm, preferably even at least 7 cm or up to the brim of each adjacent hat - and accordingly (partially) blackened.
  • Such a backlit according to the invention up to its outermost edge homogeneously radiating light scattering plate can be integrated into a lighting structure so that it appears as a structure in appearance, which has no dark, non-luminous frame.
  • the diffusion plate is the front part of a hood-like structure which has transparent side walls which, for example, are mirrored on the outer side, or provided with a diffusely light-reflecting layer.
  • the height of said side walls corresponds to the desired distance between the diffusion plate and mounting surface of the LED or the above-mentioned support plate.
  • the support plate with the LED and the light homogenizing cover plates together with the described hood-like structure is, for example, inserted in a frame-like structure with cross-sectionally L-shaped profiles floating on the edge and fixed, for example by means of a single screw so that the entire structure holds together.
  • the height of the outside of the haubeartige structure around reaching legs of the L-shaped profiles is chosen so that it is significantly smaller than the height of the side walls of the hood-like structure. This enters the frame-like Entities completely in the background and the entire structure appears essentially frameless.
  • the present invention makes it possible to solve the required homogeneous and bright illumination with as small a number of LEDs as possible, ie preferably to use so-called power LEDs, with a nominal power consumption of, for example, 0.5 watts to 5 watts or more are. It is desirable that a luminous structure of 1 m 2 in size and, for example, a total depth of less than 5 cm depending on the desired luminous intensity, for example, with 10 to 50 such LED is operable.
  • the LED used can be operated with sufficient heat dissipation with up to 3 watts and then emit at least twice as much light, there is enough reserve for even better brightness values or a reduction in the number of LEDs available.
  • the distance of the scattering plate to be illuminated must be increased to, for example, at least 4 to 5 cm in order to obtain a sufficiently homogeneous light emission from the scattering plate.
  • the distance of the scattering plate to be illuminated can be reduced to, for example, at least 2 cm in order to obtain a sufficiently homogeneous light emission from the scattering plate.
  • the present invention makes it possible to ensure that the heat generated by the LED is dissipated in a very flat design with the lowest possible thermal resistance to the environment.
  • the aim is, for example, a thermal resistance of the mounting surface of the LED to the surface which dissipates the heat to the environment of less than 20 ° C / watt or better less than 10 ° / watt.
  • the structure has the disadvantage that the relatively thick "metal-core-print" and the electrical leads leading to it disturb the light directed against the carrier plate so much that a correction by means of the described light-damping structures no longer succeeds properly , A significant improvement is possible if the side LEDs are applied to a more suitable carrier print.
  • An outstanding solution results from the use of a so-called, at least 10x10 mm flexprints with a layer sequence of approx. 20 ⁇ m copper + approx. 25 ⁇ m polyimide + approx. 20 ⁇ m copper, which is structured in such a way that the necessary electrical connection surfaces on the Top of the print are located. There is also a connection surface for the large heat-dissipating area at the bottom of the LED.
  • This thermal contact surface is connected to the copper layer on the back of the print by means of numerous so-called plated-through good thermal conductivity. If now such a, with the LED equipped by soldering Flexprint with a thin, ie about 50 micron thick adhesive layer glued to a metal support plate, this results in a thermal resistance in the region of about 5 ° C / watt. Measurements have shown that at 21 LEDs, which are fixed in this way at regular intervals on a plate of the large 0.5 m 2 and are operated with a power of about 2 watts, at an ambient temperature of about 25 ° C, the hottest spot measurable immediately at the LED, not warmer than a maximum of 35 ° C. This result is very good and promises a long life of the LED.
  • Such sheathless strands can also for
  • the present invention makes it possible to ensure in the simplest possible way that at least the electricity-carrying and light-generating parts of the structure are protected from water and dust.
  • One of the first ways to fix the dampening cover plates above the side LED is to apply the cover plates to a transparent intermediate plate. If this intermediate plate has the same lateral dimensions as a metal support plate carrying the LED and if the intermediate plate and the support plate are connected at their edges by means of a flexible, preferably transparent, plastic film, the desired waterproof and dustproof, the LED and their electrical connections containing, inner space emerged.
  • a solution which almost completely avoids the described disadvantage is the use of a carrier element of the abovementioned type which is hat-like and transparent in a lateral surface.
  • a carrier element is referred to below as a "carrier hat.”
  • Such a carrier hat which is particularly preferred for the realization of the invention has a substantially cylindrical, closed-up protuberance made of, for example, a thermoforming or injection molding, for example, a circular or rectangular base plate
  • the diameter of the cylindrical protuberance is, for example, one third to the entire diameter of the light-attenuating cover to be mounted above the LED, for example, by gluing on the upper
  • the height of the protuberance is, for example, 0.1 to 1 mm more than the height of the side mounted on the flexprint side LED, ie also that the light-attenuating structure significantly closer to the surface the Side LED is angeorndet as the scattering plate,
  • the carrier hat does not have to be cylindrical.
  • the peripheral surface surrounding the side LED can have any shape as a function of the distance from the carrier, and can be, for example, bulged or tapered or have a different shape.
  • Also in function of the azimuth angle are diverse, even non-circular courses conceivable, for example. An elliptical, curved or otherwise regular or irregular shape.
  • the course as a function of the azimuth angle is preferably free of corners and edges (ie the mathematical derivation according to the azimuth angle is continuous), so that no disturbing optical effects arise.
  • the Thickness of the lateral surface and also other surfaces of the carrier hat does not have to be constant.
  • transition between the (transparent) lateral surface and the (the damping structures supporting) top surface need not be defined exactly and by an edge but can rather be continuous, in the manner of a melon.
  • such a carrier hat with attached cover plate (the upper structure having the damping structure) around each individual side LED - or, less preferably, groups of side LEDs with a defined common radiation characteristic - with its entire lower hat surface on the support plate glued from metal and forms so per LED a waterproof and dustproof shell.
  • the lower hat area is covered with the sketched lower light attenuating structures for visual enhancement.
  • the entire base surface with applied side LED and electrical connections covering layer of waterproof material are applied, which at the points of the LED openings with at least the largest diameter the side LED or the protuberances of the carrier hats has.
  • the light emitted by the LED light hits in such a structure either on the light-attenuating structures and behaves as intended, or it hits at a very steep angle to the approximately vertical walls of the protuberance and passes almost without loss through them.
  • a carrier hat a water and dustproof construction available, which can be made not only very inexpensive, but also holds the light-attenuating structures at exactly the desired positions.
  • FIG. 1a shows the ideal spatial light distribution and the spatial light distribution of a real side LED
  • FIG. 2 shows a perspective exploded view of the basic structure of a luminous structure 20 according to the invention.
  • the entire structure is supported by a support plate 21, as shown in FIG.
  • This support plate 21 may in principle be made of any rigid material.
  • the carrier plate is a metal plate such as a steel plate. Even better, this is a plate of a good heat conductive material such as copper or aluminum.
  • the support plate 21 is made of aluminum, its thickness is at least 1 mm for a small size of, for example, up to 20 ⁇ 20 cm; for larger plate dimensions, its thickness is, for example, 2 to 3 mm. It is advantageous if the Träge ⁇ latte 21 is protected against corrosion.
  • aluminum an anodized plate is therefore advantageous.
  • the use of anodized aluminum has the further advantage that the plate surface does not conduct electricity and thus contributes to the electrical safety of the entire structure.
  • a power LED which radiates the main portion, ie, for example, at least 60% of its light symmetrically in an angular range of ⁇ 60 ° with respect to the vertical of the printed circuit boards 23 or the carrier plate 21 and which combines with an optical device is, which diverts the main portion of the light in the angular range of for example 60 ° to 100 °.
  • circuit board 23 It could also be a circuit board 23 come to use, which 2, 3 or 4, or more, preferably independently of each other carries electrically controllable side LED 22 carries. This can always be useful if, for example, differently colored light with possibly changing color shading is to be generated.
  • the circuit board 23 may in principle consist of any printed circuit board material. However, it preferably consists of a composite material with metal core, so it is a good heat conductive so-called "metal core print".
  • the printed circuit board 23 is made on the basis of Flexprint material.
  • a Flexprint material consists for example, and for the present invention preferably, of a composite of about 20 microns copper + about 25 microns polyimides + about 20 microns copper.
  • the flexprint should be totally 50 ⁇ m to 150 ⁇ m thick and have a 15 ⁇ m to 50 ⁇ m thick insulation layer.
  • the upper copper layer of the flexprint 23 is structured such that there are two electrical connections 23a, 23b for the side LED 22 and against the outside.
  • a thermal pad 23c for the so-called "thermal slug" i. the area for heat dissipation of the side LED 22 is present.
  • numerous through-holes filled with as much copper as possible to the lower side of the printed circuit board 23 can be present to improve the thermal conductivity.
  • the lower side of the circuit board 23 is completely covered with copper. All copper surfaces at the top and at the bottom are covered with an additional copper layer of at least 20 ⁇ m thickness after the process of filling the plated-through holes, which improves the heat conduction in the lateral direction.
  • the one or a plurality of side LEDs 22 may be fixed and electrically contacted by means of a bond with an electrically conductive adhesive on the printed circuit board 23.
  • this is done by means of a soldering, insbesondre is to pay attention to a good soldering the surfaces required for thermal conduction.
  • the size of the printed circuit board 23 is at least 10 ⁇ 10 mm, but preferably up to 20 ⁇ 20 mm, and is fastened to the carrier plate 21 with a very thin but very reliable adhesive layer.
  • transfer adhesive layers of about 50 microns thickness are available, which have a very high adhesive strength, are resistant to chemicals and water and at continuous temperatures between -40 ° C to 120 ° C can be used.
  • the required thermal resistance of less than 10 ° C / watt not only reached, but significantly undercut.
  • the mounted on the support plate 21 printed circuit boards 23 are connected in a suitable manner by means of electrical conductors 24 with each other and against the outside.
  • electrical conductors 24 are such that 3 groups of 3 electrically serially connected side LEDs are connected in parallel with one another.
  • completely different serial-parallel or pure serial or pure parallel interconnections are possible.
  • the electrical conductors 24 do not cause any optical interference, they must be as flat as possible or thin. This can be ensured, for example, that they are designed as, at most self-adhesive, copper strips whose thickness is for example 20 to 200 .mu.m, preferably 50 to 100 .mu.m and the for example, 5 to 20 mm wide.
  • the electrical conductors can also be designed as so-called enameled wire strands, which are available, for example, for the production of windings of small electric motors in a wide variety on the market.
  • Such a strand consists of a multiplicity of thin copper wires coated with a temperature and abrasion resistant plastic, such as PA6.6, which wrap around each other.
  • the diameter of a single copper wire is for example 40 to 100 .mu.m and, for example, 20 to 50 such copper wires per strand are used.
  • a strand with 25 enameled wires each 71 microns in diameter an electrical resistance of only about 0.18 ohms / m and has a total diameter of about 500 .mu.m and can by slight pressure on a structure with an oval cross section of maximum height of 200 to 300 microns are formed.
  • optically damping structures 25a and 25b are present.
  • the corresponding film-like elements 25a and 25b are applied to hat-shaped, transparent carrier elements, referred to hereinafter as carrier hats 25.
  • carrier hats 25 hat-shaped, transparent carrier elements
  • ring-like, possibly additionally continuously extending greyscale structures are shown both on the upper hat surface 25a and on the lower hat brim 25b, which, for example, leave 1% to 20% of the light impinging on them in the direction of the scatter plate 26, depending on location, and Keep the remainder away from it by absorption or reflection.
  • gray to black light-damping elements 25a, 25b can be used.
  • the distance between the individual circuit boards 23 with soldered side LED 22 and slipped-over carrier hats 25 is theoretically arbitrary. The meaningful distance depends on the distance between the support plate 21 and illuminated scatter plate 26, the desired luminous intensity of this illuminated diffusion plate 26 and the desired homogeneity of the light emitted by this light.
  • a distance of 3 cm between the support plate 21 and the diffusion plate 26 is assumed. If in this case a brightness is required which at least equal to that of a conventional, for example, backlit with fluorescent tubes scattering plate, so are about 6x6 side LED 22 with corresponding attenuation structures 25a and 25b per m 2 necessary to a sufficiently bright and homogeneous radiation of To ensure light from the diffusion plate 26. This results in a distance of about 16 cm between the individual
  • mirrored acrylic glass walls present, which must have the height of 3 cm in the example discussed.
  • damping structures 25a, 25b carrying carrier hut 25 with the hat brim for example by means of bonding to the support plate 21st are applied.
  • a passpartout-like film 27 for example by gluing, can be applied before or after gluing the carrier hats in the area of the side LED
  • the passpartout-like film 27 may not be applied over the entire surface, but may be divided into individual, possibly overlapping a few millimeters zones.
  • the second light-attenuating structures (the structures on the carrier plate) to be formed instead of the hat brims also formed as directly applied to the conductor / carrier plate dyeings, in which case the hat brims are at least partially transparent, or of a paspartoutähnlichen film are formed.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Planar Illumination Modules (AREA)
  • Led Device Packages (AREA)

Abstract

La présente invention permet d'éclairer par l'arrière la plaque avant de dispersion (26) d'un ensemble d'éclairage (20) de taille théoriquement quelconque avec un petit nombre de LED (22) de telle sorte que pour une profondeur totale de l'ensemble d'éclairage qui peut descendre à moins de 2 cm, la totalité de la plaque de dispersion avant, qui transmet par exemple des informations, rayonne de la lumière de manière homogène et lumineuse. Ce résultat est garanti par le fait que les LED (22) du côté alimentation, dont la puissance consommée est de 0,5 à 5 Watt ou davantage et qui rayonnent symétriquement au moins 50 % de leur lumière dans une plage d'angle solide de 50° à 100°, sont combinées avec la lumière des LED (22) à petit angle solide dans la masse souhaitée de structures d'amortissement (23a, 23b).
PCT/CH2008/000214 2007-05-14 2008-05-09 Ensemble d'éclairage WO2008138159A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08733835A EP2147424A1 (fr) 2007-05-14 2008-05-09 Ensemble d'éclairage

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH774/07 2007-05-14
CH7742007 2007-05-14

Publications (1)

Publication Number Publication Date
WO2008138159A1 true WO2008138159A1 (fr) 2008-11-20

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EP (1) EP2147424A1 (fr)
WO (1) WO2008138159A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1640756A1 (fr) * 2004-09-27 2006-03-29 Barco N.V. Méthode et système pour illuminer
US20060087866A1 (en) * 2004-10-22 2006-04-27 Ng Kee Y LED backlight
US20060092348A1 (en) * 2004-10-30 2006-05-04 Lg, Philips Lcd Co., Ltd. Backlight unit and liquid crystal display with the same
EP1742522A2 (fr) * 2005-07-08 2007-01-10 Samsung Electronics Co., Ltd. Module diode d'ensemble de lumière, ensemble de rétroéclairage et dispositif d'affichage muni de celui-ci
US20070030694A1 (en) * 2005-08-08 2007-02-08 Lg Philips Lcd Co., Ltd. Backlight assembly and liquid crystal display having the same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1640756A1 (fr) * 2004-09-27 2006-03-29 Barco N.V. Méthode et système pour illuminer
US20060087866A1 (en) * 2004-10-22 2006-04-27 Ng Kee Y LED backlight
US20060092348A1 (en) * 2004-10-30 2006-05-04 Lg, Philips Lcd Co., Ltd. Backlight unit and liquid crystal display with the same
EP1742522A2 (fr) * 2005-07-08 2007-01-10 Samsung Electronics Co., Ltd. Module diode d'ensemble de lumière, ensemble de rétroéclairage et dispositif d'affichage muni de celui-ci
US20070030694A1 (en) * 2005-08-08 2007-02-08 Lg Philips Lcd Co., Ltd. Backlight assembly and liquid crystal display having the same

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