SE543448C2

SE543448C2 - Illuminated light panel

Info

Publication number: SE543448C2
Application number: SE1950466A
Authority: SE
Inventors: Anders Rensmo
Original assignee: Anders Rensmo
Priority date: 2019-04-12
Filing date: 2019-04-12
Publication date: 2021-02-23
Also published as: SE1950466A1

Abstract

The present invention relates to an illuminated light panel comprisinga front panel (3) and a rear panel (2),a frame (1) connecting the front panel (3) and rear panel (2) to each other and holding them at a distance from each other,at least one light source (6) arranged in the light panel to illuminate the front panel, anda flexible sheet (4) arranged across the front panel - at least one fastening element configured to fixate the flexible sheet (4) in relation to the front panel (3), wherein the front panel comprises a multiwall sheet.

Description

ILLUMINATED LIGHT PANELTECHNICAL FIELD The present invention relates to an illuminated light panel having a frontpanel and a rear panel connected by a frame and at least one light sourcearranged to illuminate the front panel, and further also having a ﬂeXiblesheet arranged across the front panel and at least one fastening elementarranged to fixate the ﬂexible sheet in relation to the front panel.

BACKGROUND Light panels and illuminated signs are commonly used to displayinformation or to advertise in public spaces. It is often desirable to be able tochange the images and text displayed and for this purpose fabric signs areused Where a printed fabric is exchangeably mounted on a frame. Byremoving the printed fabric and replacing it With another bearing anotherimage, teXt or logo the fabric sign instead displays another information oradvertisement, giving a versatility that is highly desirable.

One problem associated With fabric signs is that the fastening of the fabricand tensioning on the frame is difficult and requires tools and considerableskill. Especially in large signs having a diameter of 3-5 m it is important totighten the fabric evenly onto the frame to prevent Warping or deforming ofthe fabric or to secure the fabric to prevent it from coming loose Whensubjected to Wind and rain in outdoor applications. This makes replacing thefabric difficult and even dangerous if the fabric sign is mounted high aboveground on a facade or as a pylon sign.

Fabric signs generally comprise a sturdy frame inside Which at least onelight source is arranged for illuminating the fabric from behind. The fabric isapplied to the frame and is secured by tightening With ropes or Wires thatare attached to the frame. Some fabric signs alternatively have tensionelements With ratchets or clamps. During use, the fabric may be deformed orWarped so that the displayed image is distorted and the fabric Will hangloosely on the frame, requiring maintenance in the form of additionaltightening. The fabric must be thick and strong to Withstand the tensionWithout deforming, further adding to the total Weight of the fabric sign.

One type of fabric signs according to the prior art comprises a separateframe on Which the fabric is mounted and a separate light panel on Whichthe frame With the fabric is fastened. For such fabric signs, the sturdy framemakes the sign very heavy and also risks blocking the light from the lightpanel so that the fabric is unevenly illuminated.

Since the force needed to fixate the fabric is very large the frame must beable to withstand this without deforming or breaking. For this reason framesare generally made from a metal such as steel or aluminium, rendering thesign or light panel heavy and clumsy. Mounting and dismounting require atleast two persons to be able to handle the heavy components in a secureway, in order to avoid damage or injury.

There is a need for an improved fabric sign that can overcome theseproblems.

SUMMARY The object of the present invention is to eliminate or at least to minimize theproblems discussed above. This is achieved by an illuminated light panelaccording to the appended independent claim.

The light panel according to the present invention comprises a front paneland a rear panel, a frame connecting the front panel and rear panel to eachother and holding them at a distance from each other, at least one lightsource arranged in the light panel to illuminate the front panel, a ﬂeXiblesheet arranged across the front panel, at least one fastening elementconfigured to fixate the ﬂeXible sheet in relation to the front panel, whereinthe front panel comprises a multiwall sheet. By providing a front panel, theﬂeXible sheet or fabric sheet is held securely and warping is prevented. Themultiwall structure of the front panel gives a high torsional rigidity so thatthe front panel becomes self-supporting. This signif1cantly decreases theneed to use large tensioning forces when securing the ﬂeXible sheet so thatthe fastening element or elements can be smaller and less cumbersomecompared with the prior art. Mounting and dismounting of the ﬂeXible sheetcan be performed by a single person and due to the self-supporting multiwallfront panel a weight of the light panel can be kept low so that lifting andhandling the sign becomes easy and does not require eXcessive strength orspecialist tools.

Suitably, the multiwall sheet comprises at least two sheets that are arrangedsubstantially parallel to each other and that are joined by a plurality ofinterlinking walls. The front panel is thereby given a very high torsionalrigidity while at the same time having a low weight that enables the frontpanel to support the frame and back panel so that they can be made fromsimilarly light-weight materials. When mounted with a ﬂeXible fabric sheet,the front panel supports the ﬂeXible sheet but also supports the frame of thelight panel. Fixating the ﬂeXible sheet in relation to the frame is therebyachieved without requiring ropes or wires and without the eXcessivetightening forces that are needed for a fabric sign without a front panel, giving a further advantage to the illuminated light panel according to thepresent invention.

Suitably, the front panel further comprises at least one light scatteringmedium that is arranged on a rear side of the front panel, preferably in theform of a diffusor sheet. Thereby, a diffusion of light is achieved that give aneven illumination of the fabric sheet and prevents internal Walls and thestructure of the multiWall front panel from being seen from outside the lightpanel. The light scattering medium is thus able to scatter the light to give asmooth and even illumination of the ﬂeXible sheet, thereby giving a highquality lighting to the light panel.

In some embodiments, the front panel further comprises a light scatteringmedium that is arranged on a front side of the front panel, preferably in theform of a diffusor sheet. Thereby, a further scattering of incident light on thefront panel is achieved, giving a smooth lighting Without uneven portions ordarker regions that show internal Walls of the multiWall front panel.

Suitably, the illuminated light panel comprises a holder for mounting theilluminated light panel on a structure such as a Wall. Thereby, the lightpanel is fixed in relation to a Wall or a pylon and the fastening element Whenmounted to fixate the ﬂeXible sheet on the light panel may also serve tofixate the light panel on the holder. This is achieved by the fastening elementbeing conf1gured to be mounted on the holder also conf1gured to fasten boththe ﬂeXible sheet in relation to the front panel and the light panel on theholder. This renders mounting and handling very easy and convenient andadds an additional function to the fastening element. In some embodiments,the at least one fastening element is a clamping element configured to clampthe ﬂeXible sheet to the frame or to edges of the front panel. Thereby, theﬂeXible sheet is fixated in an easy and convenient Way by applying theﬂeXible sheet and holding it in place While the clamp is applied. The clamp orclamps can be conf1gured to snap into place on the frame or on edges of thefront panel, enabling a secure holding and at the same time an easy removalWhen the ﬂexible sheet is to be replaced. In some embodiments, the at leastone fastening element is an elongated element With an L-shaped profile. Thisallows for the ﬂeXible sheet to be smoothed into place along a length of theframe covered by the elongated element so that creases and Warping of theﬂexible sheet are further prevented.

In some embodiments, the at least one fastening element is configured to bemounted on the rear panel for mounting the ﬂexible sheet on the rear panel.Thereby, the rear panel holds the at least one fastening element andprevents loads on the frame itself, preventing possible damage or fatigue ofthe material in the frame.

Suitably, the ﬂexible sheet may be configured to be folded over the frame andfixed with the fastening element to the frame or the rear panel. Thereby, teXtor images displayed on the ﬂexible sheet may be shown also on sides of theilluminated light panel to be visible to a viewer also from the side. The areaon the fabric sign available for display is increased and an onlooker canstand at an angle to the sign and still view the message displayed.

Suitably, the front panel comprises at least two front panel portions, eachfront panel portion having at least one front panel connector that isconnectable to a connectorof another front panel portion to form a modularfront panel. Thereby, very large light panels can be made by combining frontpanel portions to form a modular front panel of a desired size and shape.Manufacture and transport of the light panel is also facilitated.

The light panel may suitably also comprise at least one spacing element forholding the front panel at a distance from the rear panel, the at least onespacing element being connectable to at least one of the front panel and therear panel. Thereby, the front panel is kept ﬂat and the ﬂexible sheet issupported to also lie planar in relation to the frame. Advantageously, the atleast one spacing element may be translucent in order to allow light from theat least one light source to pass through and avoid uneven lighting of theﬂexible sheet.

Many additional benefits and advantages of the present invention will bereadily understood by the skilled person in view of the detailed descriptionbelow.

DRAWINGS The invention will now be described in more detail with reference to theappended drawings, wherein Fig. 1 discloses a perspective view of an illuminated light panelaccording to a preferred embodiment of the present invention; Fig. 2a discloses a planar view from the side of the illuminated lightpanel with a first fastening element; Fig. 2b discloses a planar view from the side of the illuminated lightpanel with a second fastening element; Fig. 2c discloses a planar view from the side of the illuminated lightpanel with a third fastening element; Fig. 3 discloses a planar view from the side of a modular light panel front according to one embodiment of the invention; Fig. 4 discloses the light panel front from the side with a first lightscattering element on a front side and a second light scatteringelement on a rear side of the light panel front; Fig. 5a discloses a first step of mounting an illuminated light panelaccording to the present invention; Fig. 5b discloses a second step of mounting the illuminated light panel ofFig. 5a; Fig. 5c discloses a third step of mounting the illuminated light panel ofFig. 5a; and Fig. 5d discloses a fourth step of mounting the illuminated light panel of Fig. 5a.DETAILED DESCRIPTION Fig. 1 discloses a preferred embodiment of an illuminated light panel 10according to the present invention, having a frame 1, a rear panel 2 mountedon a rear side R of the frame 1 and a front panel 3 mounted on a front side Fof the frame 1. At least one light source 6 is arranged in the light panel 10for illuminating the front side F, and in this preferred embodiment aplurality of light sources 6 are provided on the rear panel 2 and facing thefront panel 3. The light sources 6 are distributed across the rear panel 2 sothat an even lighting of the front panel 3 is achieved. In some embodimentsthe light sources 6 could be fewer in number and be distributed in otherways on the rear panel 2 or alternatively be distributed along an inside of theframe 1, preferably along at least one side of the frame 1. The rear panel 2 isin the preferred embodiment not translucent, allowing the light from thelight sources 6 to be transmitted out of the light panel in a direction towardsthe front F and through the front panel 3. The front side F of the frame 1 isto be understood herein as the side of the frame to which the front panel 3 isplaced. The rear side R of the frame 1 is the side of the frame 1 to which therear panel 2 is connected. In this way, the front side F of the frame 1 is theside of the frame 1 that faces outwards when the light panel 10 is mountedon a wall.

In Fig. 1, the front panel 3 is partly cut away to show the light sources 6inside the light panel 10 and also to show at least one spacing element 7provided inside the light panel 10 to hold the rear panel 2 and front panel 3on a distance from each other. The spacing element 7 may be a plurality ofspacing elements 7 and may be distributed in different ways in the lightpanel 10 but are preferably fastened to at least one of the rear panel 2 andfront panel 3. It is particularly advantageous for the spacing elements 7 to befastened to the rear panel. It is advantageous if the spacing elements 7 are translucent to prevent them from creating a shadow in the light panel 10and ascertain that light falling on the front panel 3 is evenly distributed.

It is advantageous for the spacing element 7 to be longer than the distancefrom the rear panel 2 to the front panel 3 at the inner frame 71 or frame 1.This allows the front panel 3 to be pushed outwards so that the ﬂexible sheet4 is tensioned and held in place in a more secure manner. The ﬂexible sheet4 may in such cases and others advantageously be able to stretch slightly.The same advantage may alternatively be achieved by the light panel 10being bent to a U-shape.

It is also advantageous to provide the spacing element 7 in the same area ofthe rear panel 2 that is fastened to a holder 9 (see further below). This addsadditional support for the spacing element 7 and makes it more stable.

On the light panel 10, a ﬂexible sheet 4 is arranged and fastened on the lightpanel 10 by at least one fastening element 5. The ﬂexible sheet 4 ispreferably a fabric having at least one image, text or symbol that is to bedisplayed and illuminated by the light panel 10. In a mounted state, theﬂexible sheet 4 rests on the front panel 3 and is f1xated in relation to theframe 1 by the fastening element 5 to prevent movements of the ﬂexiblesheet 4 that could result in warping of the image or text displayed. In thispreferred embodiment, the fastening element 5 has an L-shaped profile andis attached to an edge of the frame 1 or front panel 3 to clamp the ﬂexiblesheet 4 tightly to the frame 1 and front panel 3. The ﬂexible sheet is a sheetof a material that is suitable for use in a fabric sign and may compriseplastic, fabric, cloth or a mixture of different materials. The ﬂexible sheetmay be woven or non-woven and may have a visible texture or be smooth.The image and/ or text on the fabric sheet may be applied through printing,screen printing, laminating or any other suitable method where a thin layeris applied to a fabric or plastic sheet. In the preferred embodiment, theﬂexible sheet comprises a woven plastic material on which images and/ ortext is printed or laminated.

For prior art fabric signs, a fabric with a weight of 400 g/ m2 is commonlyused, whereas the present invention can also suitably be used with a fabricor ﬂexible sheet having a lower weight, sometimes about 200 g/ m2. A lighterfabric or sheet is advantageous both since the weight on the light panel islower and since light is more easily transmitted through the lighter fabricand allows for a brighter light panel 10 without requiring additional orbrighter light sources 6.

The front panel 3 comprises a multiwall sheet that comprises a plurality ofinternal walls linking parts of the front panel 3 to each other to achieve ahigh torsional rigidity and simultaneously achieve a low-weight front panel 3 6 as compared with a front panel 3 comprising a solid sheet of a material. Inthe preferred embodiment, the front panel 3 comprises at least two sheets32, 33 that are arranged substantially parallel to each other and that arejoined by a plurality of interlinking Walls 34 (see Fig. 4a-4b). In otherembodiments, a plurality of sheets with interlinking walls may be provided tofurther increase torsional rigidity and stability of the front panel 3. The frontpanel 3 is translucent so that the light from the light sources 6 istransmitted through the front panel 3 to the ﬂeXible sheet 4.

The front panel serves to hold the frame 3 in place and prevent adeformation or caving in of the frame 3 as the ﬂeXible sheet 4 is applied andfastened. This is an advantage compared with the prior art fabric signs,since one problem associated with them is deformation of the frame due tothe large tensioning forces needed for securely attaching the fabric andsubjecting the fabric sign to forces such as wind and rain. As mentionedabove, the fabric used with most prior art fabric signs is relatively stiff andheavy in order to have suff1cient material strength to withstand thetensioning forces without deforming. The illuminated light panel according tothe present invention, however, may be used with a thin ﬂeXible material inthe ﬂexible sheet and since the ﬂeXible sheet rests on the front panel duringuse, forces from wind or rain will not cause deformation of the ﬂeXible sheet.Another disadvantage associated with the prior art is that the fabric signsare not able to use all the light produced by light sources inside the sign forilluminating the fabric. Rather, light is spent inside the sign by internalreﬂection that due to the heavy and clumsy frames and tensioning elementsis not propagated towards the fabric. In the present invention it is insteadpossible to achieve a light panel with smooth inner walls and transparentspacing elements that allow the light to illuminate the translucent frontpanel and thereby light the ﬂeXible sheet.

Using a thin ﬂeXible sheet 4 also has the advantage that a tension in thematerial of the ﬂexible sheet 4 may be generated when the ﬂeXible sheet 4 isfastened to the light panel 10 to further aid in holding the ﬂeXible sheet 4 inplace.

To provide a multiwall material in the front panel 3 has the significantadvantage that the main stability of the light panel 10 arises from the sturdyand rigid front panel 3 so that other parts of the light panel 10, mainly theframe 3 may be less strong and rigid than in the prior art fabric signs. In thepreferred embodiment, the frame 3 is made from aluminium and does not initself need to have the strength to withstand large forces either fromtightening the ﬂeXible sheet on the light panel 10 or from loads due toweather when the light panel 10 is mounted on a wall or pylon outdoor.Rather, the torsional rigidity of the multiwall material in the front panel 3 7 will carry any loads on the light panel 10 and create a stable and reliablelight panel 10 that is also very light and easy to handle when mounting,dismounting or removing and replacing the ﬂeXible sheet 4. The multiwallmaterial may advantageously be made from polycarbonate but othermaterials such as PVC, PMMA or others may also be used.

Fig. 2a-2c disclose the illuminated light panel 10 from the side and showinternal structure of the light panel 10 as well as three different fasteningelements 5. Thus, the light panel 10 is shown with the rear panel 2 and thefront panel 3 held at a distance from each other and connected by the frame1. In these Figures the rear panel 2 is also made from a multiwall sheet butin other embodiments other materials could alternatively be used instead.

The frame 1 eXtends in a directional perpendicular to the front panel 3 andrear panel 2 and also eXtends a shorter distance in parallel with the frontpanel 3 and rear panel 2 so that they are held by the frame 1. In someembodiments frame fastening elements may be used to fasten the frame 1 tothe front panel 3 and rear panel 2, but in other embodiments dimensions ofthe frame 1 may enable the frame 1 to fit around the front panel 3 and rearpanel 2 without additional fastening. In some embodiments, the frame 1 maynot be U-shaped but can instead have any other suitable shape forconnecting the rear panel 2 and front panel 3 to each other.

Spacing elements 7 may be provided at a distance from edges of the frontpanel 3 and rear panel 2 as shown in Fig. 2b-2c but may also be provided atthe edges to provide an inner frame 71 or connection between the front panel3 and rear panel 2. In some embodiments, the inner frame 71 may beidentical with the frame 1 so that no other frame but the inner frame 71 isincluded in the light panel 10.

In Fig. 2a the ﬂeXible sheet 4 extends across the front panel 3 and isfastened in relation to the frame 1 by first fastening elements 51 that areprovided at edges of the ﬂeXible sheet 4 and that can be attached to a wall orsimilar structure on which the light panel 10 is mounted. Thus, by fiXing thelight panel 10 to the wall and also fixing the first fastening elements 51 tothe same wall, the ﬂeXible sheet 4 is held immobile on the light panel 10.

Fig. 2b discloses second fastening elements 52 that are provided as clampsor L-profiles on edges of the frame 1 or alternatively on edges of the frontpanel 3 underneath the frame as desired. The ﬂeXible sheet 4 is in Fig. 2bfixed in relation to the frame 1 by the second fastening elements 52 beingapplied on the front side F of the light panel 10, thereby trapping edges ofthe ﬂeXible sheet 4 and holding them firmly to the frame 1.

In Fig. 2c, third fastening elements 53 are mounted on the rear side R of theframe 1 and fixate edges 41 of the ﬂexible sheet 4 that has been applied tothe front side F and held or folded down towards the rear side R.Alternatively, the third fastening elements 53 may be applied to the rearpanel 2 so that the frame 1 is applied after the ﬂeXible sheet 4 has alreadybeen mounted on the front panel 3 and rear panel 2.

Edges 41 of the ﬂexible sheet 4 may extend further along the frame 1towards the rear R and the third fastening elements 53 may be shorter sothat sides of the frame 1 are also covered with the ﬂexible sheet 4. This isadvantageous in displaying the ﬂexible sheet 4 also in a direction sidewaysfrom the light panel 10 and increases an area where the light panel 10 isvisible to an observer to include not only the area immediately in front of thelight panel 10 but also areas located at an angle to a direction of a normal tothe front panel 3 so that an observer can stand to one side of the light panel10 and still view the ﬂexible sheet 4 and the image or text displayed thereon.

The third fastening elements 53 are in this embodiment also in the form ofclamps or L-profiles but may in other embodiments provide fastening inother ways that serve to securely fasten the ﬂexible sheet 4 to the rear panel2 or rear parts of the frame 1.

In some embodiments, the fastening elements 5 may comprise hook-and-loop fasteners (commonly referred to by the brand name Velcro tape) orstrips of double-stick tape that are applied to fasten the ﬂexible sheet 4 tothe light panel 10, preferably by lining the edges of the ﬂexible sheet 4 andfastening them to a corresponding perimeter on the front panel 3, frame 1 orrear panel 2.

Fig. 3 discloses a light panel 10 according to a second embodiment of thepresent invention where the light panel front 3 is modular and comprises atleast two elements that are combined to form the light panel 10. As shown inthe Figure, the light panel 10 comprises front panel portions 11,12 in theform of a first module 11 and a second module 12 that each has a frontpanel 3, rear panel 2, inner frame 71 and spacing elements 7. Also providedare light sources 6 on each of the first and second module 11, 12.

The front panel 3 comprises front panel connections 31 on edges of frontpanel portions on each of the modules 11, 12 that are able to mate with eachother and form a secure join. In some embodiments, the front panelconnections 31 may comprise one male and one female element, but in otherembodiments the connections may be similar and able to be combined witha snap connection or similar, and there may also be additional fasteningelements that aid in creating the connection between the front panel connections 31. The rear panel 2 similarly has rear panel connections 21that are able to mate or engage to form a secure join.

In some embodiments, the front panel portions 11, 12 or modules 11, 12may be divided into smaller components and be combined by mountingtogether either before modules 11, 12 are combined to form the light panel10 or after the light panel 10 has already been formed. It is howeveradvantageous to provide the modules 11, 12 with as few connections neededto form the light panel 10 as possible, since this increases the speed ofmounting and also increases stability of the finished light panel 10.

When forming the light panel 10 from the modules 11, 12 of Fig. 3, themodules are joined by connecting the front panel connections 31 to eachother and optionally by connecting the rear panel connections 21 to eachother. Once the joins are made and are stable, the light panel 10 is mountedas will be described later with reference to Fig. 5a-5d. The ﬂeXible sheet 4will be applied across the front panel 3 and will cover the joins so that thelight panel 10 gives a smooth appearance. When the ﬂeXible sheet 4 is fixedto the light panel 10 this may also aid in preventing the front panelconnections 31 from releasing each other during use of the light panel 10.

The front panel connections 31 and rear panel connections 21 may comprisegrooves on one that fit into corresponding protrusions on the other in orderto achieve a completely smooth front side on the front panel 3 or rear panel2. Especially on the front panel 3 it is advantageous from a light distributionperspective to have a smooth front side. In some embodiments connectionsmay alternatively comprise a dovetailing edge that extends over a matingedge or a snap connection. A dovetailing edge is especially beneficial in thatit provides a secure mounting and is able to provide the appearance of asmooth front side even though some material from one of the front panelconnections 31 or rear panel connections 21 will actually extend over anedge of the mating connection.

When applying a ﬂeXible sheet 4 onto a light panel 10 comprising modules11, 12 joins between the modules 11, 12 will become less visible and will insome embodiments be completely hidden from view so that a smooth lightpanel 10 is achieved. Of course, any number of modules 11, 12 may be usedand they can be connected side by side in a row or column or alternatively inboth rows and columns so that a larger matrix is achieved. By using theﬂexible sheet 4 to mask the joins between modules, a very large light panel10 can be made and still be easy to handle and give a smooth appearance indistributing light evenly on the ﬂeXible sheet 4 so that an onlooker gets animpression of a homogenous light panel 10 without visible patterns ordarker areas or lines.

In some embodiments, the frame may be mounted on the light panel 10 byplacing around the light panel 10 and connecting frame edges to each other,preferably by the fastening element 5 also serving to fixate the frame 1 onthe light panel 10 as well as fixating the ﬂeXible sheet 4 on the light panel10. The frame 1 may be made from an aluminium strip that is folded or bentto form an outline of the light panel 10 and may be used to form the frame 1on the light panel by the strip being placed along a circumference of the lightpanel 10, especially where there is an inner frame 71 already in placebetween the front panel 3 and rear panel 2 but other modes of placing theframe on the light panel may also be used. The fastening element 5 could inthis embodiment be used to clamp frame edges to each other at the sametime that the ﬂeXible sheet is clamped to the light panel 10. Several of thefastening elements 5 described herein in connection with differentembodiments could be used for this purpose.

In some embodiments, the fastening element 5 could be conf1gured to beconnected to the holder 9 and could also be used to fixate the frame 1 on thelight panel 10 as well as fixate the ﬂeXible sheet 4 on the light panel 10 andthe light panel 10 on the holder 9. This could for instance be achieved by thefastening element being in the form of a clamp or clamps on the holder 9 orby being in the form of an elongated fastening element with an L-profile thatattaches both to the front panel 3 and to the holder 9 and ﬂeXible sheet 4.

Fig. 4 discloses an enlarged view of the front panel 3 showing the multiwallsheet with a front sheet 32 and a rear sheet 33 that are connected by theinterlinking walls 34. Propagation of light is shown with arrows 6' from therear side R and continues through the interlinking walls 34. A first lightscattering medium 81, preferably in the form of a diffusor sheet, is providedon the front side F of the light panel front 3 and will serve to diffuse the lightso that a uniform light distribution on the ﬂeXible sheet 4 that is to beplaced on the front side F is achieved. A second light scattering medium 82,preferably also in the form of a diffusor sheet, is provided on the rear side Rand diffuses the light 6' that is transmitted from the light sources 6 so thatthe light is already evenly distributed when it reaches the front panel 3.When using a light scattering medium 81, 82 it is advantageous to use boththe first and second light scattering medium 81, 82 but it is to be noted thatan even distribution of incident light can be achieved using only one of thelight scattering media 81, 82. Surprisingly, it has been shown in light panels10 according to the present invention that the second light scatteringmedium 82 is very efficient in diffusing the light incident on the front panel 3so that a uniform distribution is achieved. Thus, in embodiments where it isnot desirable to use two separate light scattering media 81, 82 a very goodresult may be achieved using only the second light scattering medium 82. 11 Mounting the light panel 10 in a holder 9 and mounting the ﬂeXible sheet 4on the light panel 10 Will now be described with reference to Fig. 5a-5d.

In a first mounting step, the light panel 10 is provided with the rear panel 2,front panel 3, frame 1 and light sources 6 already in place. At least oneholder 9 is provided and may be mounted on a wall or pylon before mountingof the light panel 10 takes place. Alternatively, the light panel 10 may bemounted in the holder 9 first and the holder later fixed to the wall or pylon.

In a second mounting step, the light panel 10 is mounted in the holder orholders 9. In this embodiment, two holders 9 are provided and are arrangedto clamp the light panel 10 from the rear side.

In a third mounting step, the ﬂeXible sheet 4 is applied to the light panel 10and covers the front panel 3, and in a fourth step the fastening element 5 isapplied to the frame 1, front panel 3 or edges of the front panel 3 in order tofixate the ﬂeXible sheet 4 on the light panel 10.

In another embodiment, the fastening element 5 may act to both the ﬂeXiblesheet 4 on the light panel and to fixate the light panel 10 itself on the holderor holders 9. This is achieved by the fastening element 5 being configured tohold the ﬂeXible sheet 4 in place on the light panel 10 in any of the waysdescribed above, while also being configured to connect to the holder 9 sothat the frame 1 or front panel 3 of the light panel 10 is fastened onto theholder 9. The fastening element 5 may in this embodiment suitably have anL-shaped profile and extend along the entire edge of the front panel 3 asshown in Fig. 5d, but other types of fastening elements 5 described hereinmay also be suitable for this purpose. In some embodiments, the rear panel2 could alternatively also be translucent and a second ﬂeXible sheet could beapplied to the rear R of the light panel 10. The light sources 6 would then beprovided on the inside of the frame 1 in order to illuminate both the frontpanel 3 and the rear panel 2.

In some embodiments, the fastening element 5 may be integrally formed withthe frame 1. In some embodiments, the fastening element 5 may beintegrally formed with the holder 9.

In some embodiments, the ﬂeXible sheet 4 may extend across the front panel3 but not over front edges of the frame 1 and may be fixed to the light panel10 by the fastening elements 5 extending from the front edges of the frame 1inwards across the front panel 3 to hold the ﬂeXible sheet 4 against the frontpanel 3 itself. In such embodiments, the fastening elements 5 mayadvantageously have L-shaped profiles as shown in Fig. 2b or Fig. 5d.

In some embodiments, the frame 1 itself may serve as fastening element 5and be applied to the light panel 10 after the ﬂeXible sheet 4 has been placed 12 across the front panel 3. It is then advantageous to have an inner frame asdescribed above so that the front panel 3 and rear panel 2 are alreadymounted in relation to each other before the frame 1 is applied.

Generally, the ﬂexible sheet 4 Will be replaced as desired either becauseanother image, pattern or text should be displayed on the light panel 10instead or because the present ﬂexible sheet 4 has become damaged or dirty.When replacing the ﬂexible sheet 4, the present ﬂexible sheet 4 Will beremoved by loosening the fastening elements 5 so that the ﬂexible sheet 4 isseparated from the light panel 10. A new ﬂexible sheet may then be placedon the light panel 10 and be attached by the same fastening elements 5 oralternatively be attached With new fastening elements 5 that may or may notbe of the same type as previous fastening elements 5 used on that lightpanel 10.

The light panel 10 may have a quadratic or rectangular shape, but mayalternatively be circular, oval or in the form of a letter or symbol or any othershape.

It is to be noted that features from the various embodiments describedherein may freely be combined, unless it is explicitly stated that such acombination Would be unsuitable. 13

Claims

1. Illuminated light panel, the light panel comprisinga front panel (3) and a rear panel (2),a frame (1) connecting the front panel (3) and rear panel(2) to each other and holding them at a distance fromeach other,at least one light source (6) arranged in the light panel toilluminate the front panel,a ﬂeXible sheet (4) arranged across the front panel, andat least one fastening element configured to fixate theﬂeXible sheet (4) in relation to the front panel (3),Wherein the front panel comprises a multiWall sheet_ f- Illuminated light panel according to claim 1, Wherein themultiwall sheet comprises at least two sheets (32, 33) that arearranged substantially parallel to each other and that arejoined by a plurality of interlinking Walls (34). Illuminated light panel according to claim 1 or 2, Wherein thefront panel (3) further comprises at least one light scatteringmedium (82) that is arranged on a rear side (R) of the frontpanel (3), preferably in the form of a diffusor sheet. Illuminated light panel according to any of claims 1-3, Whereinthe front panel (3) further comprises at least one lightscattering medium (81) that is arranged on a front side (F) ofthe front panel (3), preferably in the form of a diffusor sheet. Illuminated light panel according to any previous claim,further comprising a holder (9) for mounting the illuminatedlight panel on a structure such as a Wall. Illuminated light panel according to claim 5, Wherein thefastening element (5) is configured to be mounted on theholder (9) and is also configured to fasten both the ﬂeXiblesheet (4) in relation to the front panel (3) and the light panel(10) on the holder (9). 10. 11. 1

2. 1

3. 1

4. Illuminated light panel according to any previous claim,Wherein the at least one fastening element (5) is a clampingelement configured to clamp the ﬂexible sheet (4) to the frame(1) or to edges of the front panel (3). Illuminated light panel according to any of claims 1-6, Whereinthe at least one fastening element (5) is an elongated elementWith an L-shaped profile. Illuminated light panel according to any of claims 1-6, Whereinthe at least one fastening element (5) is configured to bemounted on the rear panel (2) for mounting the ﬂexible sheet(4) on the rear panel (2). Illuminated light panel according to any of claims 1-6, Whereinthe ﬂexible sheet (4) is configured to be folded over the frame(1) and fixed With the fastening element (5) to the frame (1) orthe rear panel (2). Illuminated light panel according to any previous claim,Wherein the light panel (10) comprises at least two modules(11, 12) that each comprises a front panel portion, each frontpanel portion having at least one front panel connection (31)that is connectable to a front panel connection (31) of anotherfront panel portion to form a modular front panel (3). Illuminated light panel according to any previous claim,Wherein the at least one fastening element (5) also connectsthe frame (1) to the light panel (10). Illuminated light panel according to any previous claim,further comprising at least one spacing element (7) for holdingthe front panel (3) at a distance from the rear panel (2), the atleast one spacing element (7) being connectable to at least oneof the front panel (3) and the rear panel (2). Illuminated light panel according to claim 13, Wherein the atleast one spacing element (7) is translucent.