DE102010002884B4 - Lighting unit, its use as a display and method of making the lighting unit - Google Patents

Abstract

Lighting unit (1) comprising (a) a transparent support plate (2) made of glass with a first surface (3) and with a second surface which is at least partially coated with at least one opaque layer (4); (b) a housing (5) arranged on the first surface (3) of the transparent carrier plate (2), the inner surface (6) of which can at least partially reflect light rays (23); and (c) at least one illuminant (7) arranged in a space (16) between the housing (5) and the first surface (3) of the transparent carrier plate (2), light rays (23) generated by the illuminant (7) at least partially can get into the transparent support plate (2); characterized in that at least part of the inner surface (6) comprises a diffusely reflecting surface (8), the illuminant (7) is attached to the carrier plate (2), optionally mediated by a coating applied to the carrier plate (2), and light rays (23) emitted by the illuminant parallel to the support plate (2) are reflected between parts of the inner surface (6) of the housing (5) and are not guided into the support plate (2) without reflection, the illuminant (7) being inorganic or comprises organic LEDs and the first surface (3) of the carrier plate (2) is at least partially provided with a second reflective layer (11) which can diffusely or directly reflect light rays (23) of the illuminant (7) impinging on it, and wherein the lighting unit (1) on the second surface a second plate (17) made of glass and spacers (18) through which a desired distance between the carrier plate (2) and the second plate (17) is adjustable.

Description

• (a) eine transparente Trägerplatte aus Glas mit einer ersten Oberfläche und mit einer zweiten Oberfläche, die mindestens teilweise mit mindestens einer lichtundurchlässigen Schicht beschichtet ist;
• (b) ein auf der ersten Oberfläche der Trägerplatte angeordnetes Gehäuse, dessen innere Oberfläche mindestens teilweise Lichtstrahlen reflektieren kann; und
• (c) mindestens ein in einem Raum zwischen dem Gehäuse und der ersten Oberfläche der transparenten Trägerplatte angeordnetes Leuchtmittel, wobei vom Leuchtmittel erzeugte Lichtstrahlen mindestens teilweise in die transparente Trägerplatte gelangen können.

The invention relates to a lighting unit comprising

• (a) a transparent glass support plate having a first surface and a second surface at least partially coated with at least one opaque layer;
• (b) a housing disposed on the first surface of the carrier plate, the inner surface of which can at least partially reflect light rays; and
• (C) at least one arranged in a space between the housing and the first surface of the transparent support plate lamp, wherein light rays generated by the light source can at least partially reach the transparent support plate.

The invention also relates to the use of this lighting unit as a display and to a method for producing this lighting unit.

Lighting units of the type mentioned are known.

That's how it describes EP 0 354 468 A1 a planar radiator with a transparent mounting plate having a Leitbahnstruktur on which a plurality of luminescent semiconductor body in communication with the interconnect structure is fixed in a planar distribution and each semiconductor body is surrounded by a reflector, which emitted from the semiconductor body, the reflector occurring Light component reflected by the mounting plate. In a preferred embodiment, the mounting plate with semiconductor bodies mounted thereon is immersed in a plastic potting compound such that each semiconductor body is located at the focal point of the preferably parabolic plastic body. On the cured potting compound, a highly reflective material is then applied. In accordance with the function of a planar radiator, the entire reflected radiation is bundled in parallel due to the parabolic shape of the reflector, so that the greatest possible light intensity is obtained. The spotlight can be used, for example, as a vehicle light, signal light, marker lamp or in traffic lights.

A rear automotive brake light, in which LEDs are embedded in a plastic mass, which in turn is surrounded by a reflector, is in the US 5,241,457 A described.

In the DE 10 2007 017 335 A1 a lighting unit is described with a transparent support plate which is provided on one side with electrical conductors and a plurality of components and at least one light emitting diode through which light can be emitted parallel to the support plate. On the lighting unit sits a cover part with a reflector element, which is deflected by the light emitting diode parallel to the support plate radiated light in the transparent support plate. The light-emitting diode is a side LED, which is embedded in a plastic layer.

The DE 198 54 899 C1 describes a lighting unit consisting of a transparent support plate provided on one side with electrically conductive structures, and surface mountable light emitting diodes having terminals on either side of a light emitting side facing with their terminals in contact with the conductive structures and with the light emitting side of the support plate these are mounted.

Common to these hitherto known radiators or lighting units is that light coming from a semiconductive light source (LED), i. H. Light rays, by means of a laterally or around the bulb-oriented reflector more or less directly planar in a transparent plate, for example made of glass or transparent plastic, is passed.

The disadvantage of this is that a consuming calculated reflector technology is necessary and the light source is visible. Basically, there is always an indirect lighting. This is particularly disadvantageous if a spotlight or a lighting unit to be used as a display for displaying labels, symbols or drawings.

The US 6,076,948 A describes an electromagnetic radiation emitting or receiving arrangement, essentially an application in mirrors in the automotive field. 6 shows a lighting unit in which between a reflective housing and a substrate, for. B. glass, a light source, for. As a diode, is located, the light reflected from the housing through openings in a partially covering the substrate opaque layer and can pass through the translucent substrate.

The WO 2006/125174 A2 describes a thin internally illuminated sign comprising a housing having an interior surface at least partially provided with a highly reflective layer, a display surface, and a point light source positioned to radiate light approximately parallel to the display surface , The punctiform light source is in particular an LED. It also describes the use of diffuse reflected light.

The DE 27 57 869 A1 describes an electroluminescent semiconductor display device having a base material with an upper surface, a cavity formed in the base material with reflective surfaces on the bottom and sides, the sides of the cavity forming an opening in the upper surface, and an electroluminescent semiconductor. The semiconductor display device is configured so that virtually all the light emitted from the semiconductor is emitted to the reflecting surfaces and virtually no light emitted from the semiconductor is emitted toward the opening. The reflective surface has been shaped at the bottom to reflect the light toward the aperture and to reflect virtually all the light reaching the aperture first from the reflective surfaces.

The US 2003/0002281 A1 describes a shielded reflective light-emitting diode comprising at least one light source, a reflecting mirror opposite to this light source and a light-shielding member for limiting external light impinging on this reflecting mirror, wherein the light-shielding member has an optical opening portion and the reflecting mirror is formed as a cylindrical surface in which light emitted from the light source and reflected by the mirror is linearly concentrated, so that the linearly condensed light is radiated through the opening portion.

The US 2002/0154379 A1 describes an electrochromic rearview mirror assembly for a vehicle that includes a display or signal light. The assembly includes a mirror having a reflector having a partially transmissive, partially reflective surface; a sensor for determining light levels; a display arranged behind it for displaying information and a control loop connected to the first sensor and the display for determining whether day or night is and the contrast ratio of light coming from the display and light coming from the partially reflective surface is reflected, to regulate. Relevant embodiments are in the 9 and 14 , especially 9E and 14D shown.

The object of the invention was therefore to provide a lighting unit in which these disadvantages are eliminated. In particular, such a lighting unit should be suitable as a display with which a wide variety of labels, symbols and / or drawings can be displayed in a way that is advantageous or pleasant for a user.

The solution of this object is achieved according to this invention by a lighting unit, a method for producing this lighting unit and the use of this lighting unit as a display with the features of the corresponding independent claims. Preferred embodiments of the lighting unit according to the invention are listed in corresponding dependent claims. Preferred embodiments of the illumination unit according to the invention correspond to preferred embodiments of the method according to the invention and vice versa, as well as the use according to the invention, although this is not explicitly stated herein.

• (a) eine transparente Trägerplatte aus Glas mit einer ersten Oberfläche und mit einer zweiten Oberfläche, die mindestens teilweise mit mindestens einer lichtundurchlässigen Schicht beschichtet ist;
• (b) ein auf der ersten Oberfläche der Trägerplatte angeordnetes Gehäuse, dessen innere Oberfläche mindestens teilweise Lichtstrahlen reflektieren kann; und
• (c) mindestens ein in einem Raum zwischen dem Gehäuse und der ersten Oberfläche der transparenten Trägerplatte angeordnetes Leuchtmittel, wobei vom Leuchtmittel erzeugte Lichtstrahlen mindestens teilweise in die transparente Trägerplatte gelangen können;

wobei mindestens ein Teil der inneren Oberfläche eine diffus reflektierende Oberfläche umfasst, das Leuchtmittel auf der Trägerplatte, gegebenenfalls vermittelt durch eine auf der Trägerplatte aufgebrachte Beschichtung, angebracht ist, und vom Leuchtmittel parallel zur Trägerplatte abgestrahlten Lichtstrahlen zwischen Teilen der inneren Oberfläche des Gehäuses reflektiert werden und nicht ohne Reflektion in die Trägerplatte geleitet werden, wobei das Leuchtmittel anorganische oder organische LEDs umfasst und die erste Oberfläche der Trägerplatte mindestens teilweise mit einer zweiten reflektierenden Schicht, welche auf sie auftreffende Lichtstrahlen des Leuchtmittels diffus oder direkt reflektieren kann, versehen ist, und wobei die Beleuchtungseinheit auf der zweiten Oberfläche eine zweite Platte aus Glas sowie Abstandshalter, durch welche ein gewünschter Abstand zwischen der Trägerplatte und der zweiten Platte einstellbar ist, aufweist.The invention thus relates to a lighting unit comprising

• (a) a transparent glass support plate having a first surface and a second surface at least partially coated with at least one opaque layer;
• (b) a housing disposed on the first surface of the carrier plate, the inner surface of which can at least partially reflect light rays; and
• (C) at least one arranged in a space between the housing and the first surface of the transparent support plate light source, wherein light rays generated by the light source can at least partially reach the transparent support plate;

wherein at least a portion of the inner surface comprises a diffusely reflecting surface, the illuminant is mounted on the support plate, optionally mediated by a coating applied to the support plate, and light emitted by the illuminant parallel to the support plate is reflected between portions of the inner surface of the housing; are not conducted without reflection in the support plate, wherein the illuminant comprises inorganic or organic LEDs and the first surface of the support plate is at least partially provided with a second reflective layer, which can diffuse or directly reflect light rays of the illuminant incident thereon, and wherein the Lighting unit on the second surface of a second plate of glass and spacers, through which a desired distance between the support plate and the second plate is adjustable, has.

As used herein, the term "transparent" is to be interpreted as "translucent" in the broadest sense.

The illumination unit according to the invention contains, in addition to the carrier plate, a second plate, which may likewise be designed as a carrier plate. As a material for the second plate, the already known for the support plate materials are suitable.

According to the invention, it is not excluded that a third plate and further plates are used. Preferably, however, the highest still a second plate is used.

There may be further layers and / or foils between the carrier plate and the second plate. For example, one or more foils may be sandwiched between the carrier plate and the second plate, or fixedly connected to the carrier plate and / or the second plate.

The support plate and the second plate are made of glass, in particular of float glass.

In a particularly preferred embodiment, the lighting unit according to the invention in addition to the support plate on a second plate and spacers, being adjustable by the spacers a desired distance between the support plate and the second plate is. In this embodiment, it is advantageous if a film, which may have labels, etc., is inserted between the carrier plate and the second plate.

Both inorganic light emitting diodes and organic light emitting diodes are used. The light-emitting diodes can be present as top LEDs or as side LEDs. Because of the larger radiation angle preferably top LEDs are used.

The known inorganic light-emitting diode materials can be used.

In addition, organic light-emitting diodes can be used. Organic light emitting diodes generally use small organic molecules (SM-OLEDs) or organic polymers (PLEDs).

SM-OLEDs include, for example, organometallic chelates and conjugated dendrimers.

PLEDs include electrically conductive polymers such as. As polythiophenes, polypyrroles, polyfluorenes and poly (p-phenylenevinylene), which may optionally be suitably substituted. Preferred substituents are alkyl and alkoxy groups.

The advantage of PLEDs is the ability to apply them as flexible films, for example by electropolymerization of the corresponding monomers, spincoats or printing (screen printing) of the polymers on a support plate, wherein the support plate may be rigid or flexible. In addition, the power requirement for the PLEDs is relatively low.

In general, these bulbs are used with other equipment required to operate the bulbs (eg, switch, ballast, ignitor, dimmer, starter, current limiting device). These are known to the person skilled in the art, so that they will not be discussed further here.

The light source is mounted on the carrier plate, possibly mediated by a coating applied to the carrier plate

The at least one light-impermeable layer generally comprises electrical conductor tracks and components which are used in particular for controlling and supplying power to the luminous means.

The diffusely reflecting surface preferably has a proportion of at least 30%, more preferably at least 50%, and most preferably a proportion of more than 90%, based on the inner surface of the housing.

The diffusely reflecting surface of the inner surface of the housing can be achieved by using a special material for the housing and / or a special treatment of the inner surface of the housing. Alternatively, a partial or complete coating of the inner surface of the housing with a diffusely reflecting material is possible. The surface may, for example, be highly reflective white, made of silver, chrome or titanium, or matt diffusely reflective.

In a preferred embodiment of the invention, the diffusely reflecting surface comprises or consists of a fluorine-containing polymer or an inorganic material. The inorganic material preferably comprises barium sulfate and / or gold. The fluorine-containing polymer is, for example, polytetrafluoroethylene (PTFE).

Diffuse reflective surfaces are generally relatively rough relative to the wavelength of the light employed, but may be polished.

As used herein, when referring to diffuse reflection, it is meant generally a diffuse reflection of light in a wavelength range of 200 to 900 nm. Preferably, the visible region of the spectrum is used. It may be useful to tune a diffuse reflecting surface used to a desired wavelength range.

In the case of the illumination unit according to the invention, the first surface of the carrier plate is at least partially provided with a reflective layer which can reflect light incident on it, ie light beams, of the illuminant diffusely or directly, preferably diffusely. This reflective layer, which differs from the diffuser herein reflective part of the inner surface of the housing, which may also be designed as a diffusely reflecting coating, also referred to as "second reflective layer" may be formed as a separate layer on the opaque layer or replace it at least partially.

In the illumination unit according to the invention, light generated by the luminous means can enter the transparent carrier plate at least partially, but preferably as much as possible. For this purpose, the coating of the first surface of the carrier plate with an opaque layer on at least one recess or a transparent part.

In this recess or this transparent part opaque symbols, numbers or letters can be attached, which can be highlighted due to the diffuse reflected light passing through the support plate, and thus shown to a viewer. The opaque symbols, numerals or letters can also be arranged on one of the first surface of the support plate opposite the second surface of the support plate or integrated into it.

In addition, the symbols, numbers or letters themselves may consist of a luminous material, for example an organic LED (OLED) or a capacitor luminescent film. In this case, the diffusely reflected light from the housing would be a backlight.

In this way, numerous different lighting effects can be achieved.

In the illumination unit according to the invention, light rays emitted by the light source parallel to the support plate are reflected by the inner surface of the housing into the interior of the housing and are not deflected into the support plate without reflection.

In a particularly preferred embodiment, the lighting unit additionally comprises a sensor system. The sensor system may include one or more sensors that may be based on different sensor principles, e.g. B. thermal sensors, light sensors and capacitive sensors.

This makes it possible that the lighting unit is then turned on when, for example, the proximity of a human is displayed by the sensor system. For example, when using a light sensor by a low incidence of light in a room just opened the lighting unit could be turned on. Or if there is a movement in this room.

This is particularly advantageous if the lighting unit is to be used to display information.

In a preferred embodiment of the invention, therefore, at least a part of an opaque layer is configured in the form of symbols, numbers and / or letters that are highlighted when irradiated with light by recesses or transparent parts in the opaque layer.

The housing used in the lighting unit is not particularly limited in size, shape and material. The housing may also be closed or opened.

Preferably, the housing includes materials that do not absorb the reflected light but reflect, e.g. B. housing of a highly reflective plastic or highly reflective metal, or consists of this.

The interior of the housing can with a gas such. B. be filled with air, or with a plastic mass. In general, an LED is already partially in a plastic compound, so that, for example, between a located in a plastic mass LED and the housing, a gas atmosphere.

The shape of the housing can be very diverse. Possible, for example, rectangular shapes such as cuboid or pyramid or round shapes such. B. hemisphere or housing with an elliptical or parabolic cross-section.

Since the shape of the housing has an influence on the diffuse reflection, the shape of the housing will be selected taking into account the diffusely reflecting inner surface, in particular its size and arrangement, and vice versa.

In the space between the housing and the first surface of the transparent support plate one or more light sources can be arranged.

Against this background, another aspect of the present invention is the use of the illumination unit described above as a display.

• (a) eine transparente Trägerplatte aus Glas mit einer ersten Oberfläche und mit einer zweiten Oberfläche, die mindestens teilweise mit mindestens einer lichtundurchlässigen Schicht beschichtet ist;
• (b) ein auf der ersten Oberfläche der Trägerplatte angeordnetes Gehäuse, dessen innere Oberfläche mindestens teilweise Licht reflektieren kann; und
• (c) mindestens ein in einem Raum zwischen dem Gehäuse und der ersten Oberfläche der transparenten Trägerplatte angeordnetes Leuchtmittel, wobei vom Leuchtmittel erzeugte Lichtstrahlen mindestens teilweise in die transparente Trägerplatte gelangen können,

wobei mindestens ein Teil der inneren Oberfläche eine diffus reflektierende Oberfläche umfasst, das Leuchtmittel auf der Trägerplatte, gegebenenfalls vermittelt durch eine auf der Trägerplatte aufgebrachte Beschichtung, angebracht ist, und vom Leuchtmittel parallel zur Trägerplatte abgestrahlten Lichtstrahlen zwischen Teilen der inneren Oberfläche des Gehäuses reflektiert werden und nicht ohne Reflektion in die Trägerplatte geleitet werden, wobei das Leuchtmittel anorganische oder organische LEDs umfasst und die erste Oberfläche der Trägerplatte mindestens teilweise mit einer zweiten reflektierenden Schicht, welche auf sie auftreffende Lichtstrahlen des Leuchtmittels diffus oder direkt reflektieren kann, versehen ist, und wobei die Beleuchtungseinheit auf der zweiten Oberfläche eine zweite Platte aus Glas sowie Abstandshalter, durch welche ein gewünschter Abstand zwischen der Trägerplatte und der zweiten Platte einstellbar ist, aufweist, und wobei

• (i) eine transparente Trägerplatte mit einer ersten Oberfläche mindestens teilweise mit mindestens einer lichtundurchlässigen Schicht beschichtet wird;
• (ii) auf der ersten Oberfläche der transparenten Trägerplatte ein Gehäuse angebracht wird, dessen innere Oberfläche mindestens teilweise Lichtstrahlen reflektieren kann und mindestens ein Teil der inneren Oberfläche eine diffus reflektierende Oberfläche umfasst;
• (iii) in einem Raum zwischen dem Gehäuse und der ersten Oberfläche der transparenten Trägerplatte ein Leuchtmittel angebracht wird, und
• (iv) mindestens ein Teil der ersten Oberfläche nicht beschichtet oder mit einem transparenten Material beschichtet wird, so dass vom Leuchtmittel erzeugte Lichtstrahlen mindestens teilweise in die transparente Trägerplatte gelangen können.

The invention also provides a method for producing a lighting unit, comprising

• (a) a transparent glass support plate having a first surface and a second surface at least partially coated with at least one opaque layer;
• (b) a housing disposed on the first surface of the support plate, the inner surface of which can at least partially reflect light; and
• (c) at least one illuminant arranged in a space between the housing and the first surface of the transparent support plate, wherein light rays generated by the illuminant can at least partially enter the transparent support plate,

wherein at least a portion of the inner surface comprises a diffusely reflecting surface, the illuminant is mounted on the support plate, optionally mediated by a coating applied to the support plate, and light emitted by the illuminant parallel to the support plate is reflected between portions of the inner surface of the housing; are not conducted without reflection in the support plate, wherein the illuminant comprises inorganic or organic LEDs and the first surface of the support plate is at least partially provided with a second reflective layer, which can diffuse or directly reflect light rays of the illuminant incident thereon, and wherein the Lighting unit on the second surface of a second plate made of glass and spacers, through which a desired distance between the support plate and the second plate is adjustable, and wherein

• (i) a transparent support plate having a first surface at least partially coated with at least one opaque layer;
• (ii) mounting on the first surface of the transparent support plate a housing, the inner surface of which may at least partially reflect light rays, and at least a portion of the inner surface comprises a diffusely reflecting surface;
• (iii) a lamp is mounted in a space between the housing and the first surface of the transparent support plate, and
• (iv) at least a part of the first surface is not coated or coated with a transparent material, so that light rays generated by the light source can at least partially pass into the transparent support plate.

The various opaque or transparent layers, including conductive tracks and reflective layers, can be advantageously applied by screen printing.

The invention has numerous advantages. The lighting unit according to the invention allows a low construction height, low installation costs, in addition, no special lighting is required. In addition, it is environmentally friendly and advantageously allows a modern product design. In embodiments of the invention, the illuminant is in the non-visible region. A shadow effect by other components such. B. resistors or capacitors can be avoided. Moreover, the realization of disappearance effects in "Black in Black" or "White in White" is also possible. There are no restrictions on the possible colors. Finally, function-dependent colors and device states can be displayed in the illumination unit according to the invention via RGB.

The invention is explained in more detail below with reference to non-limiting embodiments, wherein the 1 to 5 Reference is made. Here are the in the 1 to 4 shown lighting units (first, second, third) not claimed.

1 shows a sectional view through a first lighting unit.

2 shows a sectional view through a second lighting unit.

three shows a sectional view through a third lighting unit.

4 shows a display containing a lighting unit.

5 shows a sectional view through a fourth lighting unit, which is according to the invention.

1 shows a sectional view through a first lighting unit 1 , The lighting unit 1 includes a transparent support plate 2 , here made of glass, with a first surface three partially coated with at least one opaque layer 4 is coated. On the first surface three the transparent support plate 2 , in particular on a light-impermeable layer applied thereto 4 is a housing 5 arranged, at least part of its inner surface 6 a diffuse reflecting surface 8th having.

At the in 1 shown lighting unit is a light source 7 so in a room 16 between the case 5 and the first surface three the transparent support plate 2 arranged that it is on the first surface three the transparent plate 2 located. In addition, the housing forms 5 a closed structure, leaving housing 5 and transparent carrier plate 2 to form a closed space.

From the bulb 7 generated light can through recesses or a transparent coating on the transparent support plate 2 at least partially in the transparent support plate 2 reach. The space between the bulb 7 and the housing three is filled with air.

The housing 5 has a hemispherical shape, wherein at least a part of the inner surface 6 of housing 5 as a first reflective surface, a diffusely reflecting surface 8th includes, referring to the inner surface here 6 of the housing 5 has a share of at least 90%. The diffusely reflecting surface 8th consists here of a highly diffusely reflecting polytetrafluoroethylene.

The at least one opaque layer 4 includes electrical conductors 9 and components 10 ,

Moreover, at the in 1 shown illumination unit, the first surface three the carrier plate 2 at least partially with a second reflective layer 11 , Which light incident on the bulb 7 diffuse or reflect directly.

From the bulb parallel to the carrier plate 2 radiated light is in the embodiment shown here between parts of the inner surface 6 of the housing 5 reflected and not immediately in the carrier plate 2 directed.

The lighting unit 1 additionally includes a sensor system 12 , The light source 7 here includes inorganic LEDs.

The lighting unit of the 1 is suitable for a display, because at least a part 13 the opaque layer 4 is in the form of symbols, numbers and / or letters 13 designed.

The layers 4 and 11 as well as the symbols, numbers and / or letters 13 are applied here in the form of a paste by means of screen printing.

2 shows a sectional view through a second lighting unit 1 , The lighting unit shown here differs from the one in 1 shown lighting unit characterized in that the housing 5 has the shape of a hemisphere. Otherwise, the same reference numerals have the same meaning here as for 1 ,

three shows a sectional view through a third lighting unit. The lighting unit shown here differs from the one in 2 shown illumination unit in that the light source 7 not here on the support plate but not shown here supports on the housing 5 is attached. Otherwise, the same reference numerals have the same meaning here as for 1 ,

4 shows a display containing a lighting unit. In the form of opaque symbols, numbers and / or letters 13 Here, the indication "ON" is shown, which is located in a recess or a transparent coating on the transparent support plate 2 located. 4 means an opaque layer. 12 here means a sensor system, which allows that in the presence of a user - automatically or after a measure of the user - the display is turned on with the lighting unit. For this still necessary components and conductors are in 4 Not shown.

5 shows a fourth illumination unit according to the invention, in which in addition to the transparent support plate, a second plate is present. Transparent carrier plate and second plate consist of glass here.

At the in 5 shown embodiment of a lighting unit according to the invention is located between the transparent support plate 2 and the second plate 17 a through spacer 18 realized gap 22 , In the gap 22 there is a slide 19 which has, for example, labels for explaining symbols in a display. A thickness of the film and a width of the gap 22 are chosen so that a secure attachment of the film 19 is ensured in the gap. On the transparent support plate 2 facing side of the second plate 17 is a second opaque layer 20 applied. The second opaque layer 20 was prepared by applying a black paste by screen printing and then baking the paste. The second opaque layer 20 has second transparent recesses 21 on. The arrangement of the transparent recesses 21 is matched to the film, in particular a label of the film, so that the film or a label located thereon in the region of these recesses for a left of the lighting unit 1 located - not shown here - viewer is recognizable.

The transparent carrier plate 2 is on a first surface three at least partially with an opaque layer 4 Coated by recesses or transparent coatings 14 is interrupted. In the embodiment shown here are in the region of the recesses or transparent coatings 14 Symbols, numbers and / or letters 13 arranged from an opaque material, the one - not shown here - viewer with the help of diffused light through the support plate 2 is blasted, made visible. 12 means a capacitive sensor.

LIST OF REFERENCE NUMBERS

1

lighting unit

2

Transparent carrier plate

3

First surface

4

Opaque layer

5

casing

6

Inner surface

7

Lamp

8th

Diffuse reflective surface

9

Electrical tracks

10

Electrical components

11

Second reflective layer

12

sensor system

13

Symbols, numbers and / or letters

14

Recess or transparent coating

15

display

16

Space between housing and first surface

17

Second plate

18

spacer

19

(Labeled) foil

20

Second opaque layer

21

Second transparent recesses in the opaque layer

22

gap

23

Light rays (light)

Claims (10)

Lighting unit ( 1 ) comprising (a) a transparent support plate ( 2 ) made of glass with a first surface ( three ) and having a second surface which is at least partially coated with at least one opaque layer ( 4 ) is coated; (b) one on the first surface ( three ) of the transparent support plate ( 2 ) arranged housing ( 5 ), whose inner surface ( 6 ) at least partially light rays ( 23 ) can reflect; and (c) at least one in a room ( 16 ) between the housing ( 5 ) and the first surface ( three ) of the transparent support plate ( 2 ) arranged bulbs ( 7 ), whereby the light source ( 7 ) generated light beams ( 23 ) at least partially into the transparent support plate ( 2 ) can get; characterized in that at least a part of the inner surface ( 6 ) a diffusely reflecting surface ( 8th ), the lighting means ( 7 ) on the carrier plate ( 2 ), optionally mediated by a on the support plate ( 2 ) applied coating, and from the light source parallel to the carrier plate ( 2 ) radiated light beams ( 23 ) between parts of the inner surface ( 6 ) of the housing ( 5 ) are reflected and not without reflection in the support plate ( 2 ), whereby the illuminant ( 7 ) comprises inorganic or organic LEDs and the first surface ( three ) of the carrier plate ( 2 ) at least partially with a second reflective layer ( 11 ), which light rays ( 23 ) of the illuminant ( 7 ) can diffuse or reflect directly, is provided, and wherein the lighting unit ( 1 ) on the second surface a second plate ( 17 ) made of glass and spacers ( 18 ), by which a desired distance between the support plate ( 2 ) and the second plate ( 17 ) is adjustable. Lighting unit ( 1 ) according to claim 1, characterized in that the at least one opaque layer ( 4 ) electrical conductors ( 9 ) and components ( 10 ). Lighting unit ( 1 ) according to claim 1 or 2, characterized in that the diffusely reflecting surface ( 8th ), relative to the inner surface ( 6 ) of the housing ( 5 ), has a share of at least 30%. Lighting unit ( 1 ) according to one of claims 1 to 3, characterized in that the diffusely reflecting surface ( 8th ) comprises or consists of a fluorine-containing polymer or an inorganic material. Lighting unit ( 1 ) according to claim 4, characterized in that the inorganic material comprises barium sulfate and / or gold. Lighting unit ( 1 ) according to one of claims 1 to 5, characterized in that it additionally comprises a sensor system ( 12 ). Lighting unit ( 1 ) according to one of claims 1 to 6, characterized in that at least one part ( 13 ) an opaque layer ( 4 ) in the form of symbols, numbers and / or letters ( 13 ) is configured. Lighting unit ( 1 ) according to one of claims 1 to 7, characterized in that the housing ( 5 ) comprises or consists of a highly reflective plastic or a highly reflective metal. Use of the lighting unit according to one of Claims 1 to 8 as a display ( 15 ). Method for producing a lighting unit ( 1 ) comprising (a) a transparent support plate ( 2 ) made of glass with a first surface ( three ) and having a second surface which is at least partially coated with at least one opaque layer ( 4 ) is coated; (b) one on the first surface ( three ) of the transparent support plate ( 2 ) arranged housing ( 5 ), whose inner surface ( 6 ) can at least partially reflect light; and (c) at least one in a room ( 16 ) between the housing ( 5 ) and the first surface ( three ) of the transparent support plate ( 2 ) arranged bulbs ( 7 ), whereby the light source ( 7 ) generated light beams ( 23 ) at least partially into the transparent support plate ( 2 ) can get; wherein at least a part of the inner surface ( 6 ) a diffusely reflecting surface ( 8th ), the lighting means ( 7 ) on the carrier plate ( 2 ), optionally mediated by a on the support plate ( 2 ) applied coating, and from the light source parallel to the carrier plate ( 2 ) radiated light beams ( 23 ) between parts of the inner surface ( 6 ) of the housing are reflected and not without reflection in the support plate ( 2 ), wherein the illuminant comprises inorganic or organic LEDs and the first surface ( three ) of the carrier plate ( 2 ) at least partially with a second reflective layer ( 11 ), which light rays ( 23 ) of the illuminant ( 7 ) can diffuse or reflect directly, is provided, and wherein the lighting unit ( 1 ) on the second surface a second plate ( 17 ) made of glass and spacers ( 18 ), by which a desired distance between the support plate ( 2 ) and the second plate ( 17 ), characterized in that (ii) a transparent carrier plate ( 2 ) with a first surface ( three ) at least partially with at least one opaque layer ( 4 ) is coated; (iii) on the first surface ( three ) of the transparent support plate ( 2 ) a housing ( 5 ) whose inner surface ( 6 ) at least partially light rays ( 23 ) can reflect; (iv) in a room ( 16 ) between the housing ( 5 ) and the first surface ( three ) of the transparent support plate ( 2 ) a light source ( 7 ) is attached; and (v) at least a portion of the first surface ( three ) is not coated or coated with a transparent material, so that the light source ( 7 ) generated light beams ( 23 ) at least partially into the transparent support plate ( 2 ) can get.

Images