Patent Publication Number: US-10309640-B2

Title: Floor covering system comprising a lighting system

Description:
FIELD OF THE INVENTION 
     The invention relates to a floor covering system comprising a floor covering having a user side and an opposite back side, and a lighting system provided at the back side of the floor covering 
     The invention also relates to a floor covering and a floor covering tile for use in the floor covering system. 
     The invention further relates to a method for providing the floor covering system, and to the use of the floor covering system for way guiding. 
     BACKGROUND OF THE INVENTION 
     Lighting on or in floors is known in the art. EP0323682 for instance describes an apparatus for guiding the occupants of a building along a path of travel within the building which comprises modular carpet tiles which are arranged to cover the floor of the structure, with some of the tiles being signal units having a light-transmissive, moulded plastics housing positioned in an opening therein, and having light-emitting diodes positioned in the housing. The light-emitting diodes are energised via an electrical cable, and thereby provide a visually discernable pathway on the floor. 
     Further, also textiles comprising optical fibres are known in the art. US20070037462 for instance describes a method for manufacturing a distributed optical fibres scrim comprising functional optical fibres, the functional optical fibres scrim thus manufactured, and composites in which an optical fibres scrim is incorporated. This document describes a variety of textile scrims, particularly adhesively bonded non-woven scrim materials, each comprising at least one optical fibre with a continuous path across at least the length or width of the fabric. Such optical fibres scrims may be useful as sensor components (for example, as a detector of breakage, strain, pressure, or torque), as illumination components (for example, in a variety of light-providing applications), or as data-distribution components, either alone or in combination with other materials, such as fabrics, films, foams, and the like. 
     U.S. Pat. No. 4,754,372 describes an illuminable covering of a textile material having a fibrous face with at least one light source connected to the back of the textile material. A plurality of light-transmissive fibers are connected to the light source and emanate therefrom, with their free end portions terminating adjacent the fibrous face of the textile material for transmitting light thereto when the light source is energized. In an embodiment, the textile material is a floor covering material such as a carpet or rug. 
     The use of electronic components in for instance carpets is known in the art. WO2007033980 for instance describes such carpet, as well as a method for equipping a carpet with electronic components. In order to create a method which ensures that the electronic components can be applied to the carpet in an efficient and accurately locatable manner, the electronic components that are fixedly joined to a support material are glued to the carpet with the aid of the supports. 
     U.S. Pat. No. 4,794,373 describes an apparatus for visually guiding the occupants of a structure in a path of travel along the floor within the structure is provided. This apparatus is comprised of a carpet overlying the floor, and a lighting strip positioned underneath the carpet. The lighting strip comprises an elongate ribbon, with a group of laterally spaced-apart electrical conductors encased in and extending longitudinally of the ribbon of sheet material. A series of light-transmissive plastic housings are connected to and arranged longitudinally along a common outer surface of the ribbon of plastic sheet material. Light-emitting means are positioned within each of the housings, and are electrically connected to predetermined ones of the group of electrical conductors encased in the ribbon of sheet material. The carpet has holes extending therethrough which are arranged in a series corresponding to the series of light-transmissive housings on the lighting strip. The housings are positioned in the holes of the carpet so that when the light-emitting means positioned within the housings are energized, a visually discernible pathway appears along the face of the carpet. 
     SUMMARY OF THE INVENTION 
     A disadvantage of many of the prior art is for instance that the light sources or their housing penetrate the carpet. This may be undesired by users for reasons of aesthetics, because there is no “real broadloom” covering and there may be no constant covering feel and sight. Additionally cleaning of the system may become more difficult, because the lighting system may need to be cleaned independent of the carpet. Another problem of prior art may be that the cost is too high, and this cost is strongly increased by the housing required for the light sources. Further, it may add to the complexity of the systems, which makes installation of the prior art light sources difficult. Another disadvantage of prior art is that the lighting pattern cannot easily be changed after the system has been installed. 
     There is a desire to provide coverings with lighting functions, but there is also a desire to be flexible when arranging the covering and the lighting on a floor. Further, there is also a desire to provide a covering that is preferably at least one or more of robust, cheap, widely usable and widely accepted. 
     It has been found that floor coverings according to the present invention, being floor coverings that have a light transmission for light generated by the lighting system in the range of 0.5% to 30%, and that are chosen from the group consisting of PVC floorings and laminate floorings, may fulfil one or more of these criteria. In the context of this invention, a flooring is a finishing material for application over a floor surface to provide a walking surface. A PVC flooring is a flooring that comprises (or is based on) polyvinyl chloride (PVC). A laminate flooring is a flooring that comprises (or is based on) laminate flooring tiles or panels, a laminate flooring tile or panel being a flooring product comprising a fused multi-layer structure. 
     Additionally, the advantage of floor covering tiles is that they may easily be replaced, which may make it also possible to replace or repair a lighting system that is installed below the tile(s). 
     Hence, it is an aspect of the invention to provide an alternative floor covering that may allow a lighting function, as well as an alternative floor covering tile, that may also allow a light output function (especially lumination), which preferably further at least partly obviate one or more of above-described drawbacks. 
     In a first aspect, the invention provides a floor covering system comprising (a) a floor covering having a user side and an opposite back side, and (b) a lighting system (comprising one or more light sources) arranged to generate light, and provided at the back side of the floor covering, wherein the floor covering has a light transmission for light generated by the lighting system in the range of 0.5% to 30%, especially in the range of 1% to 20%, and wherein the floor covering is chosen from the group consisting of PVC floorings and laminate floorings. 
     In this way, a robust floor covering system may be provided, substantially based on state of the art floor covering producing processes. However, here the floor covering system also provides the option of providing light, while on the other hand, the transmissivity of the floor covering is chosen such that the lighting system is not visible when no light is emitted. Hence, the floor covering system may produce light, but the light sources behind the floor covering are not visible. Preferably, the transmission is in the range of 0.5% to 20%, such as 1% to 20%. Especially, the transmission is equal to or smaller than 15%, such as equal to or smaller than 10%, like for instance 1% to 10% or 1% to 5%. Hence, the indicated transmission range may on the one hand provide enough transmission through the floor covering, for instance to make the light effect even visible under typical office lighting conditions, especially assuming state of the art LEDs, preferably solid state LEDs, but on the other hand, substantially prevents visibility of elements (such as for example the light source) under the floor covering. Visibility of the floor or other elements under the floor covering may especially not be desired, because the light source (or other elements, like electric wires, reflective foil, a padding) may no longer be hidden. The principle presented here may also be indicated as “hide light”: the light sources may be hidden and not visible to a user of the floor covering system, while the light generated thereby is visible to the user. 
     The transmission or light permeability can be determined by providing light at a specific wavelength with a first intensity to the material and relating the intensity of the light at that wavelength measured after transmission through the material, to the first intensity of the light provided at that specific wavelength to the material (see also E-208 and E-406 of the CRC Handbook of Chemistry and Physics, 69 th  edition, 1088-1989). 
     Transmission is measured of light travelling through the floor covering (tile) from the back side to the user side. The back side is the part of the floor covering (tile) that is in general arranged on the floor (optionally with an adhesive such as glue). The user side is the front side, and is the side that is visible to users when the floor covering is arranged on a floor. The intensity of the light downstream of the top face or user side is related to the intensity of the light upstream of the floor covering, i.e. at the back side. The light shed on the back side for determining transmission is preferably directed on the back side under normal incidence and the total integrated light emission on the other side of the floor covering is measured. 
     An additional advantage of the present invention may be that the floor covering is protecting the lighting system that is underneath. Thus, when people are walking over the floor covering system, the floor covering may protect the lighting system from damage. Additionally, this may eliminate the need to use a protective housing for the lighting system, which may make the lighting system cheaper to produce. 
     Such floor covering system may be used in nearly any type of rooms or areas, such as living rooms, kitchens, bed rooms, play rooms, mud rooms, laundry rooms, aisles, shops, indoor training areas, garages, offices, schools, hotels, libraries, hospitals, transport vehicles (trains, boats, etc.), etc. 
     Such floor covering systems are arranged to provide floor light, i.e. light emanating from the floor covering when the lighting system is switched on. The floor light may be used to light rooms or areas, but may also be used as functional or decorative lighting. The floor light may alternatively or additionally also be used to provide information, like commercial information (trademarks, trade names, prices, etc.), other information (like time, temperature, date), and way finding information, such as directions for finding shops, rooms, entrances, exits, or areas. Especially, the floor covering system may be used to provide emergency way finding. Hence, the invention also provides the floor covering system as described herein for way guiding, especially for emergency way guiding. Therefore, such floor covering system may in an embodiment also be used to provide information by creating a lighting pattern on the floor (like an arrow, etc.). 
     The floor covering system according to the invention may comprise a wall-to-wall (or fitted) floor covering or a floor covering comprising a plurality of floor covering tiles. Hence, in an embodiment, the floor covering may comprise a plurality of PVC flooring tiles or a plurality of laminate flooring tiles (panels). The use of tiles may be advantageous, since in case a light source may need to be replaced, repaired or removed, only the relevant tile(s) may have to be removed (temporarily). In general, the tiles are arranged adjacent from each other, such that a closed floor covering is obtained. PVC and laminate floor covering tiles often have connectors, which allow plugging one tile in another tile. In this way, tiles can be “clicked” together; for instance, jigsaw-type of structures may be applied. Further, the lighting system may comprise a plurality of lighting units. This may provide freedom in where arranging light sources and may reduce use of material. 
     The lighting system in general comprises a plurality of light sources, especially LED (light emitting diode) light sources. The term “plurality of light sources” may refer to 2 or more light sources (especially LEDs), especially 2 to 100,000, for instance 2 to 10,000, like 4 to 300, such as 16 to 256. Hence, the lighting system may comprise a plurality of LEDs, such as 2 to 10,000 LEDs/m 2 , especially 25 to 2,500 LEDs/m 2 . 
     Note that the plurality of LEDs may be distributed over a plurality of lighting units. Thus, a lighting system may comprise one or more lighting units. In general, the lighting system will comprise a plurality of lighting units, depending upon the area to which the floor covering system is applied. The lighting units may be adjacent, or may be arranged at non-zero distances from each other. The lighting units may be powered independently or dependently. The lighting units may for instance be electrically interconnected. A controller (see below), may control one or more lighting units individually. The controller may (also) control one or more light sources individually. 
     For example, a 10 meter corridor in an office might comprise 10 tiles corresponding with 10 lighting units, each lighting unit comprising around 20 to 80 mono-colour LEDs, for instance for outlining an arrow. 
     Therefore, the term “lighting system” may also refer to a plurality of lighting units. Further, the invention does not exclude that in a floor covering system comprising a plurality of tiles arranged on a lighting system comprising a plurality of light sources, not each tile is arranged over one or more light sources. Likewise, the invention does not exclude that in a floor covering system comprising a plurality of tiles arranged on a lighting system comprising a plurality of lighting units, not each tile is arranged over one or more lighting units. 
     The light source(s) may be any light source, such as a small incandescent lamp or a fiber tip or fiber irregularity (arranged to let light escape from the fiber, which embodiment has the advantage that it is relatively cheap), but may especially be a LED (light emitting diode). A specific advantage of using LEDs is that they are relatively small and may thereby fit better in a recess in a substrate (see also below). As mentioned before, a total thickness of the lighting system below 1 mm is preferred, and this may only be achieved with LEDs. The term LED may refer to OLEDs, but especially refers to solid state lighting. Unless indicated otherwise, the term LED herein further refers to solid state LEDs. Especially, the light source is part of a lighting system comprising a plurality of light sources. 
     Solid state LEDs as light source(s) is especially desired because of their small dimensions. Such light sources with state of the art technique may be less than 1 mm thick, even in the range of about 0.2 mm (excluding a support structure of 0.5 mm to 1 mm thickness, such as a printed circuit board (PCB), or smaller. When arranging such light source (for example having a total thickness of 1 mm including support structure) on a floor, the floor covering may be arranged over the light source without substantial influence of the (presence of the) light source on the (local) surface height of the floor covering. 
     Nevertheless, it may be preferred to take into account the presence of a light source under the floor covering and include a means that may level the lighting system. 
     In yet another embodiment, the invention provides a floor covering for use in the floor covering system, having one or more recesses at the back, in which at least part of the lighting system can fit. For instance, the recess(es) may be arranged to host at least part of a light source, or at least parts of a plurality of light sources, but the recess(es) may also be arranged to host at least part of a lighting unit, or at least parts of a plurality of lighting units, respectively. Hence, in an embodiment the lighting unit may at least partly be arranged in one or more recesses at the back side of the floor covering (wall-to-wall or tiled). 
     In a specific embodiment, the floor covering system may further comprise an auxiliary layer, such as a levelling layer and/or an adhesive layer, arranged between at least part of the lighting system and at least part of the floor covering. This auxiliary layer may be arranged between lighting units. It may also be arranged between light sources that may protrude from a substrate, such as a PCB. The auxiliary layer may also be arranged on the entire lighting unit or lighting system. Especially, the auxiliary layer may be selected from the group consisting of a levelling layer and an adhesive layer. 
     When the auxiliary layer is arranged over one or more light sources, the auxiliary layer may be chosen to be transmissive. For instance, a transmissive foil or a transmissive adhesive may be used. The levelling layer may also be chosen such that it can (plastically) deform to shape itself over the light source(s) (and/or lighting system). The auxiliary layer may also be arranged in such a way, that the light source(s) (or at least emitting surface(s) thereof) are free from the auxiliary layer. For instance, the levelling layer may comprise one or more holes, arranged to allow light from one or more light source travel through. 
     In an embodiment, the levelling layer is attached to part of the lighting system. For instance, each lighting unit may comprise such levelling layer, attached to at least part of its top side. Hence, in an embodiment, the levelling layer may be part of the lighting system. The levelling layer may comprise plastic, felt, PCB material (i.e. insulating material such as poly tetra fluoroethylene or FR-4), or other materials. 
     Alternatively or additionally, a lighting unit comprising a substrate with one or more light sources, may also comprise at its top face one or more cavities or recesses for hosting the one or more light sources. The one or more light sources may be partly or completely recessed in the one or more cavities/recesses, respectively. When the one or more light sources and/or other electrical components are hosted in one or more recesses, a substantially flat lighting system may be achieved. 
     Hence, in an embodiment, the invention also provides a lighting system that preferably comprises a printed circuit board (PCB) with one or more recesses, especially for hosting one or more light sources. The one or more recesses may be arranged to host one or more light sources and/or one or more other electrical components, such as electrical connections, resistors, transistors, power source(s), controller(s), etc. A specific embodiment is a PCB as substrate, with light sources and/or other (electronic) components of the lighting system embedded in a levelling layer on the PCB (substrate). This levelling layer may especially (also) be PCB material. The levelling layer may comprises openings or recesses, wherein at one or more parts of the lighting system may be arranged, especially the light sources. Such PCB (substrate) with (PCB) levelling layer can in an embodiment be considered as a laminate, such as a PCB laminate. The advantage of using PCB material as levelling layer is that the recessed structure may be manufactured in the manufacturing process of PCB laminates. 
     Conducting layers in PCBs are typically made of thin copper foil. Insulating layers (dielectrics) are typically laminated together with epoxy resin pre-preg. Dielectrics may for instance be chosen from the group consisting of polytetrafluoroethylene, FR-4, FR-1, CEM-1 or CEM-3. Well known pre-preg materials used in the PCB industry are FR-2 (phenolic cotton paper), FR-3 (cotton paper and epoxy), FR-4 (woven glass and epoxy), FR-5 (woven glass and epoxy), FR-6 (matte glass and polyester), G-10 (woven glass and epoxy), CEM-1 (cotton paper and epoxy), CEM-2 (cotton paper and epoxy), CEM-3 (woven glass and epoxy), CEM-4 (woven glass and epoxy), CEM-5 (woven glass and polyester). 
     Preferably, the total height of the light sources, and even more preferably the total height of the lighting system is at maximum 1 mm, preferably less, such equal to or less than about 0.7 mm, especially 0.5 mm or less, such as 0.2 mm to 0.4 mm, like 0.3 mm. 
     The lighting system is preferably made as thin as possible and is preferably very flat, because otherwise the outlines of the lighting system may be visible through the floor covering. Flatness may for instance be achieved by the herein described levelling layer. Since especially PVC- and laminate flooring tiles can be very sensitive to uneven parts of the floor (risk of breaking the tile in time), a small height and/or a flat lighting system are preferred. 
     In another embodiment, the lighting system comprises openings through the entire lighting system such that the floor or wall underneath the lighting system is exposed through these openings. The advantage of this approach is that no adhesion promoting layer may be necessary, because the floor covering may adhere directly to the floor. 
     The floor covering system may further comprise a controller, which may be arranged externally from the floor covering system but which may also be integrated in the floor covering system, arranged to control the lighting system, and especially the individual light sources of the lighting system. In embodiments wherein the floor covering system comprises a plurality of lighting units, the floor covering system may comprise one or more controllers. In general, there will be one central controller, herein further indicated as “controller”. For larger floor areas, optionally a plurality of independent or dependent controllers may be used. Hence, in an embodiment, the floor covering system further comprises a controller arranged to control the lighting system; i.e. the controller is arranged to control the light generated by the lighting system. In this way, also for instance information may be provided, like arrows indicating in a specific direction, or commercial information. One or more of colour, on/off state, intensity, pattern shape and information content of the light may be variable and may be controlled by the controller. A controller may be integrated in the lighting units. For example, by having a controller on each board (or lighting unit), the different boards may communicate with each other, for instance to determine the on/off states, etc. 
     Further, the floor covering system may comprise a sensor, wherein the controller is arranged to control the light of the lighting system in response to a sensor signal of the sensor. Hence, in an embodiment one or more of colour, on/off state, intensity, pattern shape and information content of the light may be dependent on a sensor signal of a sensor (such as a touch or approach sensor), wherein the sensor is arranged to sense an object on or in the vicinity of the floor covering, and wherein the controller is arranged to control or more of colour, on/off state, intensity, pattern shape and information content of the light in dependence of the sensor signal. Therefore, in yet another embodiment, the floor covering system further comprises a sensor, such as a touch or an approach sensor, which may be arranged externally from the floor covering system but which may also be integrated in the floor covering system. 
     In yet a further embodiment, the invention provides the floor covering system or the lighting system (designed for use in such floor covering system) in combination with a sensor and the controller, wherein the sensor is arranged to provide a sensor signal when the sensor is approached or touched, and wherein the controller is arranged to control one or more parameters selected from the group consisting of a lighting parameter (such as one or more of colour, colour distribution, light intensity, light intensity distribution, blinking frequency, etc.) of the floor covering system or the lighting system, respectively, pattern shape of the light, and information content provided by the light. Patterns or information will in general be provided by a plurality of light sources. 
     The invention also provides in a further aspect a floor covering per se, for use in the floor covering system according to the invention, having a light transmission for light in the range of 0.5% to 30%, especially in the range of 1% to 20% (see also above), wherein the floor covering is chosen from the group consisting of PVC floorings and laminate floorings. 
     According to a further aspect, the invention provides a floor covering tile chosen from the group consisting of PVC flooring tiles and laminate flooring tiles (panels), having a user side and an opposite back side, and having a light transmission for light in the range of 0.5% to 30%, especially in the range of 1% to 20% (see also above). In a specific embodiment, the floor covering tile may further comprise a lighting unit arranged at the back side of the floor covering tile, wherein the floor covering tile and the lighting unit are integrated. Such tile may be used as one unit that advantageously combines lighting properties and flooring covering properties in one unit. Such unit may be replaced in one action. 
     In another alternative embodiment the floor covering tile has a recess in which (part of) the lighting system fits, such that there may be no need for a levelling layer during installation. In this way, (part of) the lighting system may easily installed or replaced (at exactly the same location). Hence, in an embodiment of the invention, the lighting unit is at least partly arranged in one or more recesses at the back side of the floor covering tile. Further, the invention also provides floor coverings (per se) for use in the floor covering system according to the invention, having one or more recesses arranged at the back side of the floor covering and arranged to host at least part of the lighting system. 
     In a specific embodiment, the floor covering is a PVC flooring that comprises a filler material having a refractive index in the range of 1.4 to 1.65, such as 1.5 to 1.6. Such index of refraction may match relatively well with the index of refraction of the PVC. Preferably, the index of refraction of the filler material matches with the index of refraction of PVC (i.e. preferably less than about 20%, more preferably less than about 10%, even more preferably less than about 5%, difference with the index of refraction of PVC) This may improve transmission and reduce light loss. In another embodiment, the filler material may comprise one or more materials selected from the group consisting of calcium carbonate, aluminium trihydrate, polycarbonate, and glass, especially aluminium trihydrate. Optionally, zeolites may be applied. In a specific embodiment high purity calcium carbonate is applied. 
     According to yet a further aspect, the invention provides a method for providing the floor covering system of the invention, comprising arranging a lighting system on a floor, optionally arranging an auxiliary layer, such as a levelling layer on at least part of the lighting system, and arranging the floor covering, optionally in the form of a plurality of floor covering tiles, over the lighting system. 
     Terms like “below”, “above”, “top”, and “bottom” relate to positions or arrangements of items which would be obtained when the floor covering system, floor covering or floor covering tiles are arranged substantially flat on a substantially horizontal surface with the user side and back side of the floor covering (tiles) and/or top side and bottom side of the lighting system substantially parallel to the substantially horizontal surface. However, this does not exclude the use of the floor covering system in other arrangements, such as against a wall, or in other (vertical) arrangements. 
     The terms “upstream” and “downstream” relate to an arrangement of items or features relative to the propagation of the light from a light generating means (here the lighting system, especially the light source, such as the LED), wherein relative to a first position within a beam of light from the light generating means, a second position in the beam of light closer to the light generating means is “upstream”, and a third position within the beam of light further away from the light generating means is “downstream”. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Embodiments of the invention will now be described, by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, and in which: 
         FIG. 1  schematically depicts an embodiment and the floor covering system according to the invention; 
         FIGS. 2 a  to 2 f    schematically depict embodiments and variants thereof of the floor covering system according to the invention; 
         FIGS. 3 a  to 3 b    schematically depict embodiments and variants thereof of the floor covering system according to the invention; 
         FIG. 4  schematically depicts an embodiment and variants thereof of the floor covering system according to the invention; 
         FIG. 5  schematically depicts an embodiment and variants thereof of the floor covering system according to the invention; 
         FIG. 6 a    schematically depicts an embodiment of a laminate flooring tile for use in the flooring covering system of the invention; and 
         FIG. 6 b    schematically depicts a lighting system to be placed below the laminate flooring tile when used in floor covering system according to the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       FIG. 1  schematically depicts an embodiment of a floor covering system  10  according to the present invention. The floor covering system  10  comprises (a) a floor covering  100  and (b) a lighting system  200  arranged to generate light  210 . 
     The floor covering  100  has a user side  101  and an opposite back side  102 . The lighting system  200  has a top side  201  and a bottom side  202 . The lighting system  200  is arranged at the back side  102  of the floor covering  100 . As can be seen in  FIG. 1 , the top side  201  of the lighting system  200  and the back side  102  of the floor covering  100  are facing each other. The back side  102  may also be indicated as illumination side. The lighting system  200  in this embodiment comprises a plurality of light sources  205 , such as LEDs. The lighting system  200  is arranged to generate light  210  (when switched on). In this embodiment, the lighting system  200  comprises one lighting unit  250  (i.e. the lighting unit is the lighting system); in general the lighting system  200  may comprise a plurality of lighting units  250  (see below). The lighting system  200  may be powered by an external power source (indicated with “V”). 
     The floor covering  100  has a light transmission for light  210  generated by the lighting system  200  in the range of 0.5% to 30%, especially in the range of 1% to 20%. In this way, an observer/user perceiving the user side  101  of the floor covering  100  will essentially not see the lighting system  200  or other items behind the back side  102  of the floor covering  100 . The observer will observe the floor covering  100  as “normal” floor covering  100 . However, when the lighting system  200  provides light  210 , this light  210  is observed by the observer. The source of light is hidden; the light itself is perceived. 
     The floor covering  100  is chosen from the group consisting of PVC floorings and laminate floorings. 
     The invention is also directed to the floor covering  100  per se, having user side  101  and opposite back side  102 , and having a light transmission for light  210  in the range of 0.5% to 30%, especially in the range of 1% to 20%, wherein the floor covering  100  is chosen from the group consisting of PVC floorings and laminate floorings. The floor covering  100  may be a PVC flooring comprising a filler material. The filler material may for instance comprise one or more materials selected from the group consisting of calcium carbonate, aluminium trihydrate, polycarbonate, and glass. The invention is also directed to the lighting system  200  per se. 
     The lighting system  200  in general comprises a substrate or support, indicated with reference  203 , which substrate or support  203  comprises the light source(s)  205 . For instance, support  203  may be a PCB (printed circuit board). To such PCB, LEDs may be provided. 
       FIGS. 2 a  to 2 c    schematically depict non-limiting means/embodiments with an auxiliary layer, for instance to smooth or level the lighting system  200 . These embodiments show an auxiliary layer  500 , arranged between at least part of the lighting system  200  and the floor covering  100 . The auxiliary layer may for instance comprise an adhesive. The auxiliary layer may also be arranged as levelling layer. In  FIG. 2 a   , the auxiliary layer  500  is substantially only present between the light sources  205  and not over the light sources  205 .  FIG. 2 a    schematically depicts a cross-section. To illustrate the terms “downstream” and “upstream” in relation to  FIG. 2 a   : user side  101  is downstream of back side  102 ; back side  102  is upstream of user side  101 . 
       FIG. 2 b    schematically depicts a top view of the embodiment of  FIG. 2 a   , however without the floor covering  100 . It can be clearly seen that the levelling layer  500  has openings, indicated with reference  503 , for the light sources  205 . Hence, the lighting system  200  may provide light  210 , without substantial absorption of the levelling layer  500 , since the levelling layer  500  has openings  503  to allow light  210  travel in the direction of the floor covering  100 . 
       FIG. 2 c    schematically depicts an embodiment wherein the auxiliary layer  500  is also arranged over the light sources  205 . The auxiliary layer may be chosen to be transmissive for light  210  of the lighting system  200 . 
     The levelling layer  500  may be part of the lighting system  200 , i.e. it may be a layer attached to the lighting system  200 . For instance, it may be a laminate of support  203  (such as a PCB) and levelling layer  500 . The levelling layer may in an embodiment be made of PCB material. 
       FIG. 2 d    is used to illustrate some parameters of the lighting system  200 . The total height of the lighting system is indicated with h 2 ; the height of the support  203  is indicated with h 1  and the height of the light source(s)  205 , if protruding from the top side  201  of the lighting system  200  (or support  203 ), is indicated with h 3 ; i.e. h 2 =h 3 +h 1 . The total height h 2  may for instance be in the range of about 1 mm. 
       FIG. 2 e    schematically depicts an embodiment wherein the floor covering  100  comprises recesses  104 , also indicated as covering recess. Variants are schematically depicted, wherein the left part of the Figs. shows a plurality of recesses, arranged to host at least part of the lighting system  200 , more precisely at least part of the lighting unit  250  drawn on the left. More precisely, in this variant the recesses  104  are arranged to host the light sources  205  of the (left) lighting unit  250 . At the right, a variant of recess  104  is shown, also arranged to host at least part of the lighting system  200 , more precisely in this variant at least part of the (right) lighting unit  250 . More precisely, in this variant, the recess  104  is arranged to host the (right) lighting unit  250 . 
       FIG. 2 f    depicts a specific variant of the lighting system  200  schematically depicted in  FIG. 2 a   . The lighting system  200  comprises a substrate  203 , which is especially a PCB. Light sources  203  and/or other (electronic) components of the lighting system  200  are embedded in levelling layer (indicated as auxiliary layer  500 ), in recesses  204  (these recesses  204  may also be indicated as openings  503 ). In this way, a flat lighting system  200  may be provided. The levelling layer may also be PCB material, laminated to the PCB substrate. Hence, in this way a PCB (Printed Circuit Board) with one or more recesses  204  may be obtained, especially for hosting one or more light sources  205 . The one or more recesses  204  may be arranged to host one or more light sources  205  and/or one or more other electrical components, such as electrical connections, power source(s), controller(s), etc. The lighting unit  250  schematically depicted in  FIG. 2 f    may be considered a laminate. 
       FIG. 3 a    schematically depicts an embodiment wherein the floor covering  100  comprises a plurality of floor covering tiles  150 .  FIG. 3 b    schematically depicts an embodiment wherein the lighting system  200  comprises a plurality of lighting units  250 .  FIG. 3 b    by way of example also shows (optional) electric connections  251  between (adjacent) lighting units  250 . Note that the floor covering system  100  may also comprise a plurality of floor covering tiles  150  and a plurality of lighting units  250 . In an embodiment, the number of floor covering tiles  150  may be larger than the number of lighting units  250 . In such embodiment, when lighting units  250  may not be adjacent, (also) an auxiliary layer may be arranged between the lighting units  250 . A unit may for instance have dimensions like 5 cm to 50 cm length and width, and 0.1 mm to 1 mm height. 
       FIG. 4  schematically depicts some variants of the invention. Here, the floor covering tile  150  is a PVC floor covering tile that comprises connectors  103 . These may be used to connect multiple tiles  150  and form a “closed” tile area, i.e. a PVC flooring. Further, by way of illustration, light  210 , emanating from the user side  101 , in the form of a symbol is depicted. 
       FIG. 5  schematically depicts an embodiment of the floor covering system  10  further comprising a controller  300  arranged to control the lighting system  200 , more precisely the light  210  that may be generated by the lighting system  200 . The controller  300  may be arranged external from the lighting system, but may also be integrated in the lighting system  200 . The controller  300  controls the one or more light sources  205 . Optionally, the floor covering system  10  may further comprise a sensor  400 . The controller  300  may then be arranged to control the light  210  of the lighting system  200  in response to a sensor signal of the sensor  400 . The term “sensor” may also relate to a plurality of sensors. Such plurality of sensors may for instance be arranged to sense the same parameter (like touch of a user) at different locations, or to sense different parameters (like touch of a user and smoke, respectively). 
       FIG. 6 a    schematically depicts an embodiment of a laminate flooring tile for use in the floor covering system of the invention. The laminate flooring tile  700  comprises recess  701 , which penetrates through the inner core layer  702  and the sound inhibitor layer  703  (which is an example of an optional backing layer). The recess  701  does not penetrate through the photographic layer  704  and protective layer  705 . This allows the lighting system  706 , comprising the light source  708 , to be placed below the laminate flooring tile  700  when used in a floor covering system according to the invention, as shown in  FIG. 6 b   , so that light  707  can penetrate through the laminate flooring tile  700 . When the lighting system  706  is placed below the laminate flooring tile  700 , the part of the laminate flooring tile  700  that remains on top of the recess  701  is preferably separated from the top of the light source  708  by a distance of at least 1 mm, more preferably at least 3 mm, to prevent direct contact between the laminate flooring tile  700  and the light source  708 , which could damage the light source  708 , when pressure is exerted on the laminate flooring tile  700 , for example by people standing or walking on the floor covering system. 
     The recess  701  may be filled with a transparent or at least light transmissive material. The advantage of this approach is that the robustness of the laminate flooring tile  700  is improved. For example, a suitable material may be a polymer material, such as PVC, PMMA, PE, PP, or a silicone rubber. When the lighting system  706  is placed below the laminate flooring tile  700  wherein the recess  701  is filled with a transparent or at least light transmissive material, the transparent or at least light transmissive material is preferably separated from the top of the light source  708  by a distance of at least 0.5 mm, to prevent direct contact between the transparent or at least light transmissive material and the light source  708 , which could damage the light source  708 , when pressure is exerted on the laminate flooring tile  700 , for example by people standing or walking on the floor covering system. 
     The recess  701  may also not fully penetrate through the inner core layer  702  (in other words, a thin layer of inner core material remains) in order to improve the robustness of the laminate flooring tile  700 . This remaining layer of inner corer material has to have a thickness that allows light  707  to be transmitted, preferably a thickness of less than 1 mm, more preferably less than 0.5 mm. A laminate flooring tile with such a recess may be manufactured by providing a laminate flooring tile, providing a recess at the back side of the laminate flooring tile, having a depth so that a thin layer of inner core material remains, the thin layer having being light transmissive, and optionally filling the recess with a light transmissive material. 
     The recess  701  may be used as a mixing cavity to mix the colors of a plurality of LEDs with different colors. Preferably the colors are generated by an RGB LED. The advantage of this approach is that the recess  701  not only provides ease of installation, but also provides the optical function of mixing light. 
     In case the recess  701  is used as a color mixing cavity, it may have a pre-determined shape so that this pre-determined shape is visible on the front side of the laminate flooring tile  700  when the lighting system  706  is turned on. The recess  701  may for example have a rectangular shape. 
     The recess  701  may contain a plurality of LEDs. In one example, the recess  701  has the shape of an arrow, and contains 80 LEDs in various places within the recess  701 . In this way, a uniformly illuminated arrow will be visible on the front side of the laminate flooring panel  700  when the LEDs are turned on. 
     The laminate flooring tile  700  may be provided with a plurality of recesses  701  in order to allow flexibility in placement of a lighting system. This means that light sources are not installed at every recess, but instead only a few recesses are used. This embodiment may for example be used to provide a line of light sources near the walls of a room. 
     Alternatively, instead of having the recess  701 , the entire inner core layer  702  may be made from a light transmissive material. 
     To improve alignment between the lighting system  706  and the laminate flooring tile  700 , the lighting system  706  may be attached to the laminate flooring tile  700 , for example by using an adhesive, but preferably by using a ‘click’ connection. In this way the lighting system  706  may still be moved and placed freely, but the lighting system  706  is easier to align to the laminate flooring tile  700 . 
     Electric power may be distributed through the laminate flooring tile  700 . To achieve this, the laminate flooring tile  700  may be provided with a conductor arrangement on or through the laminate flooring tile  700 . Electric connections are made between this conductor arrangement and the lighting system  706  during installation, for example by clicking the lighting system  706  onto the laminate flooring tile  700 . The advantage of this approach is that no additional electric wires are required and no soldering is required, because this is handled by clicking the lighting system  706  onto the conductor arrangement in the laminate flooring tile  700 . 
     Preferably, the laminate flooring tile  700  comprises connectors that allow multiple tiles to be connected together, in order to connect the power lines between a plurality of laminate flooring tiles. In order to supply power to the lighting system  706 , an installer now only needs to make a power connection to one of the laminate flooring tiles, in order to power all laminate flooring tiles in a network. The conductor arrangement may also comprise an additional conductor line which may be used as a data connection to the lighting system  706 . The lighting system  706  may comprise a controller for controlling the light output in response to a data signal on the data connection. 
     The recess  701  may be filled with a light guide, such that the light  707  can be spread even further than a mixing chamber would be able to achieve. The light guide may be a lossy light guide to give a uniform light output, but the light guide may also have light out-coupling sites, in order to make for example a dotted light output pattern. 
     The floor covering system  10  may be used to show decorative patterns, but may also be used to provide information, such as by providing a light pattern containing information like arrows, commercial information, etc. (see also above). 
     A person standing or walking on the floor covering system  10 , more precisely on the user side  101  of the floor covering  100 , is preferably not able to see the lighting system  200  (when in an off state) from above. This may especially be achieved through the relatively low transmission of not more than about 15%, preferably not more than about 10%, such as 5% or lower. 
     In a further embodiment the floor covering system  10  is used to make an emergency escape route lighting system that may be activated in case of an emergency. The embodiment comprises the floor covering system  10  located on the floor. The floor covering system  10  may comprise a plurality of light sources  205 , which may optionally be connected with each other. The light transmissive floor covering (tiles) is (are) used to cover the lighting system  200 . The lighting system  200  may for example be arranged to generate light  210  in the shape of light spots, but may also be in the shape of arrows, to point into the right direction for escape. This arrow may also be made variable, such that the direction of the arrow may be changed depending on the location of the emergency. For example, the arrow may point away from a fire hazard. Instead of an arrow, also blinking lights may be used to point into a direction. In this way, also information may be provided, like arrows indicating in a specific direction, commercial information. One or more of colour, pattern shape, on/off state, output intensity, and information content of the light  210  may be variable and may be controlled by the controller. 
     Further, one or more of colour, pattern shape and information content of the light  210  may be dependent on a sensor signal of a sensor (such as a touch or approach sensor or fire sensor or smoke sensor or thermal sensor, etc.) (not depicted), wherein the sensor is arranged to sense an object on or in the vicinity of the floor covering system  10  or is arranged to sense a feature selected from the group consisting of smoke and heat, and wherein the controller  300  is arranged to control one or more of colour, on/off state, intensity, pattern shape and information content of the light  210  in dependence of the sensor signal. 
     Optionally, the controller  300  may also control other apparatus, indicated with reference  600 , such as other lighting sources. The light  210  may for instance be controlled in response to a sensor signal of one or more sensors  400 . One or more of such sensors  400  may for instance be arranged to measure the light level (in a space or room), which light level may for instance at least partly receive a contribution of other light sources, including day light. 
     The term “substantially” herein, such as in “substantially flat” or in “substantially consists”, etc., will be understood by the person skilled in the art. In embodiments the adjective substantially may be removed. Where applicable, the term “substantially” may also include embodiments with “entirely”, “completely”, “all”, etc. Where applicable, the term “substantially” may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%. The term “comprise” includes also embodiments wherein the term “comprises” means “consists of”. Likewise, the term about may, where applicable, indicate a deviation of 10% or less, or 5% or less, or 1% or less, or 0.5% or less, or even 0.1% or less, and also in an embodiment no (measurable) deviation. As will be clear to the person skilled in the art, small deviations from numerical values may, where applicable, in general be allowed. Hence, except for the values in the definition of about above, numerical values may, where applicable deviate a 10% or less, or 5% or less, or 1% or less, or 0.5% or less, or even 0.1% or less from the given value. To stress this, herein sometimes the word “about” is used before numerical values. 
     Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein. 
     The devices herein are amongst others described during operation. As will be clear to the person skilled in the art, the invention is not limited to methods of operation or devices in operation. 
     It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. Use of the verb “to comprise” and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. The article “a” or “an” preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the device claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.