EP3223265A1 - Display device for an electrical device and electrical device - Google Patents

Abstract

A display device (20) for an electrical appliance has a UV light source (37) for emitting UV light and a light housing (23) with an interior space therein, wherein the UV light source (37) in the light housing (23) and in radiates the interior. In the luminous housing (23), an opening (26) is provided towards an upper side, which is closed by a cover (29), wherein the cover (29) has a translucent cutout (31). In the luminous housing (23) or in the interior lighting material is provided flat, which is designed such that it fluoresces when illuminated with UV light and emits light for transmission through the cutout as a light indicator with a shape corresponding to the cut.

Description

The invention relates to a display device for an electrical appliance and an electrical appliance provided with such a display device.

From the DE 102015212915 A1 a display device for an electrical appliance is known with which a light display can be achieved below a hob plate. Thus, operating conditions of the hob can be displayed, alternatively it can be a marker for placing a cooking pot on the hob.

From the EP 1317164 A2 It is known to arrange a display device with LED under a hob plate of a hob. In this case, the display device is arranged directly next to an induction coil and can display their location and possible functional states.

TASK AND SOLUTION

The invention has for its object to provide an aforementioned display device and an electrical appliance provided therewith, with which problems of the prior art can be avoided and it is in particular possible to easily and advantageously arrange a display on an electrical appliance and operate, whereby the assembly process of the electrical appliance should be simplified.

This object is achieved by a display device having the features of claim 1 and provided with such a display device electrical appliance having the features of claim 14. Advantageous and preferred embodiments of the invention are the subject of further claims and are explained in more detail below. Some of the features mentioned are described only for the display device or only for the electrical appliance. However, you should be able to apply independently for both the display device and for the electrical appliance independently. The wording of the claims is incorporated herein by express reference.

The display device has a UV light source for emitting UV light. In the context of the present invention, a UV light source is intended to mean that the UV light source emits predominantly or at least 50% of its radiation intensity light in the UV range, ie light having a wavelength of less than 400 nm. Advantageously, it emits 95% or almost exclusively UV light, ie at most small proportions in the visible region, for example in the adjacent blue region. Furthermore, it has a luminous housing with an interior space therein, wherein the said UV light source radiates into or into the interior of the luminous housing into or into the interior, thus illuminating it. The light housing has an opening to an upper side. A cover in the luminous housing closes this opening, wherein the cover has a translucent cutout. This may be a translucent window, alternatively a recess or a breakthrough. This will be explained in more detail below. This cutout can be used to form or define the optical light display with its shape, because it is irradiated with light.

According to the invention, luminescent material is provided in the luminous housing or in the aforementioned interior, which is distributed or provided in a planar manner and / or occupies a proportion of at least 30% to 50% of the inner surface of the luminous housing or the interior. The luminescent material is designed such that it emits light when illuminated or illuminated with UV light, advantageously by fluorescence. Thus, the generated and emitted light can escape through said cutout from the light housing and form said light indicator. Thus, it is possible with the invention to provide a visual light indicator that is clearly visible. Due to the indirect production of the illuminated display or the light of the illuminated display by virtue of the fact that the UV light source illuminates the luminous material in the luminous housing and in turn causes it to glow and shine through the cutout as a luminous display, a homogeneous and well distributed luminous appearance or illuminated display can be created become. Since an LED is advantageously used as the UV light source, as is generally the case as a light source, and this usually has a very punctiform luminous characteristic, it is thus possible to use complicated optical devices such as lenses, mirrors or the like. be waived. Likewise, diffusion media or the like. be saved, which normally equalize the luminous appearance or a light indicator, but swallow relatively much light and are therefore detrimental.

In an embodiment of the invention, it is possible that the cutout is formed as a recess in the cover, ie as a material recess or breakthrough or opening. Such a production is the easiest possible. In an alternative embodiment, the Cutout only have a light transmission, but otherwise be closed. Thus, for example, in a light-impermeable material of the cover, a translucent viewing window may be used from appropriate plastic. Alternatively, the entire cover could be made of translucent material, but coated on at least one side with opaque material. The shape of the translucent cutout is then made by removing the material in the manner of a remote masking or the like. With a translucent closed section of the cover, a closed or encapsulated light housing can be produced, for example, for use in polluting environment.

In a further embodiment of the invention can be provided that the cover is designed as a removable lid for the light-emitting housing. This then means that, for example, easier repair or maintenance or easier replacement of the luminous material and / or the UV light source can be achieved.

Furthermore, it can thus be achieved in a generally advantageous embodiment of the invention that different covers or covers or covers with different cut-outs are produced for a standard luminous housing or for a single type of luminous housing. Depending on the desired light display, the cover can then be selected and installed with the matching light cutout. Thus, only the covers, which may be formed, for example, as a simple and rectangular plastic parts, must be made in different variants. This reduces the effort and costs. An attachment of the cover to the light housing can by pressing, snapping, clipping or the like. done, so solvable. Alternatively, such a connection can be positive and can not be solved nondestructively. In yet another alternative, a cover or a lid can be glued to the light housing.

In the invention, it is advantageously provided that the light-emitting housing is formed light-tight or shielded when the cover is placed thereon. Only the cutout of the cover should let light through or shine outwards and thus be visible.

Advantageously, the luminous material can be arranged substantially at a distance from the cutout and / or to the cover in a lower region and / or in a rear region of the luminous housing or the interior remote from the UV light source or removed. It is thus achieved that the luminous housing or the interior can be covered or provided with luminous material on a plurality of surfaces in order to achieve good light conversion and radiation through the cutout for the light display to achieve. Luminous material is particularly advantageously arranged in a lower region of the light housing, which is remote from the UV light source or removed. In this case, the luminous material can therefore reach until shortly before the UV light source, but advantageously have a distance of 10% to 30% of the length of the luminous housing. This achieves a more uniform irradiation with the UV light source and thus a more even light conversion. In a preferred embodiment of the invention can be provided that phosphor is provided in the lower region of the light housing and on the two lateral sides and advantageously also on a transversely to the lateral sides extending rear wall portion of the interior, which is then approximately cuboid.

In an advantageous embodiment of the invention, the luminous material in the luminous housing may be at least partially channel-like elongated and have a longitudinal extent along the direction of illumination of the UV light source. By this groove-like design, in particular according to the above description with laterally raised side walls, relatively much area of the interior of the light housing is covered with luminescent material, so that just a lot of light for the light display can be generated. A middle region of the luminous material may be lower in this groove-like formation along the said longitudinal extension, so that sidewall regions subsequently pull upwards on the left and right. The side wall areas may even reach up to the opening or to the cover under certain circumstances. Depending on the configuration of the display device, however, the luminous material can also end just below the cover, since light emitted from the uppermost region would no longer radiate outwards through the cutout or would be visible from the outside as a luminous display.

For an aforementioned central region of the luminous material may be provided in an embodiment of the invention that this is formed in the longitudinal direction away from the UV light source rising or its distance from the cover is lower. Thus, advantageously at the farthest end with the greatest distance to the UV light source, the luminescent material can reach towards the top or towards the opening up to this opening or to the cover. In particular, in this area, the luminous material can be pulled up as far as on the aforementioned side wall areas.

Advantageously, the cutout has a lateral distance to the side wall areas or to the luminous material. This distance can be 1 mm to 3 mm or lie between the single and five times or even ten times the thickness of the cover.

In an embodiment of the invention, it is possible to manufacture the luminescent material as an independent component or to provide the luminescent material on an independent component. This component can then be inserted into the luminous housing, in particular be permanently installed, for example glued. Thus, an easier separate production of a component with the luminous material on it or from the luminous material is possible. In particular, a complicated introduction of luminous material into the luminous housing or into the interior can then be dispensed with by a spraying or painting process or a multi-component injection molding process. The coating or painting of a separate component, for example over its entire surface, in particular down to its underside and possibly also outside, is considered to be simpler than in an interior of the light housing.

The design of the luminous material is not a problem for the person skilled in the art. Paints or plastics which fluoresce fluorescently upon irradiation with UV light are known to the person skilled in the art. Such UV-stimulable dyes or dyes are available, for example, from the company Kremer Pigmente. Alternatively, it is also possible to provide UV-stimulable quantum dots or quantum dots in the luminous material for achieving these properties, which are offered, for example, by Messrs. CAN GmbH in Hamburg.

Alternatively, of course, a direct introduction or coating or painting of the interior of the light housing take place. For this purpose, the luminous material can be applied to a floor area and / or sidewall area of the interior. Here, spraying or spraying can be used, as well as tampon printing or dipping.

Advantageously, the cutout has a symbol shape so as to define the appearance of the illuminated display to be displayed. Under certain circumstances, a plurality of cutouts per luminous housing or per UV light source can be provided if a symbol consisting of several parts or segments is to be displayed as a luminous display. Alternatively, the luminous material may have a symbol shape and thus define the appearance of a light display to be displayed. For this purpose, it is advantageous only provided on a flat floor area to shine upwards.

In an embodiment of the invention, the luminous material may be designed differently for the presentation of a plurality of different colors, or different luminous material may be provided for a plurality of different colors, for example for two or three colors. So with little effort multi-colored symbols can be displayed or it For example, a multi-color display can be created that requires only a single light source. In this case, these different colors may be provided in separate areas, in particular, the areas adjacent to each other and should be formed adjacent to each other. The different colors can be achieved as described above by spraying or painting or a multi-component injection molding process, alternatively by so-called massive production of appropriate plastic or material.

In a further embodiment of the invention, a light deflection and / or light guide can be provided between the UV light source and the luminous material, whereby the UV light source may possibly be arranged further away from the luminous material. For example, it can be better protected against excessively high temperatures, which could lead to impairment or failure. In this case, the UV light source is advantageously arranged below a plane of the luminous material or lower than the luminous material, that is, as it were, further away from the cover than the luminous material.

It is possible that the UV light source by means of a deflection surface or reflection surface as a light deflection on the luminous material radiates or lights, so that the luminous material can continue to be aligned towards the top cover. The deflection surface or the reflection surface can cause a light deflection at an angle between 70 ° and 110 °, advantageously about 90 °, and extend obliquely to a luminous axis of the UV light source. It can be flat or slightly arched, so that it can cause in addition to a pure deflection and a focussing or fanning the light.

In an embodiment of the invention, the deflection surface or reflection surface may be arranged on the cover, in particular be made in one piece with this. This eliminates the need to manufacture and assemble another separate part. It may be or have an additional surface coating, alternatively a surface treatment, advantageously as a kind of mirror. Thus, an improved light deflection or reflection of the light of the UV light source can be achieved towards the phosphor.

As an alternative to a deflecting surface or reflection surface, an optical waveguide could also be provided in order to overcome an optionally greater distance between UV light source and luminous material. It can be an elongated light guide, for example several cm long. Thus, a UV light source can be arranged in any case in a cooler place.

It can advantageously be provided for a display on an electrical appliance or for such an electrical appliance that a plurality of such display devices or lighting housing are provided with UV light sources. Thus, symbols can be displayed at various points of the electrical appliance, possibly also different symbols. In particular, it is also possible that a display device has a plurality of UV light sources and a plurality of internal spaces, but these are provided on a single integrally formed light-emitting housing.

In an advantageous embodiment of the invention, the UV light source can be plugged into a breakthrough or an opening in the light housing. In this case, this insertion, for example with a latching or clamping connection, represent an attachment of the UV light source. Particularly advantageously, the UV light source is attached laterally or on a side wall of the light housing and below the cover on the light housing. Alternatively, advantageously, the UV light source can be inserted at the bottom at a bottom of the light housing, wherein a plug-in direction is vertical, either from bottom to top or from top to bottom. The light source should generally as well as possible irradiate the luminous material, so that this in turn radiates through the cutout and forms the illuminated display. Under certain circumstances, two or even more UV light sources can be provided for an interior.

Advantageously, the display device is designed as a complete and integrated unit, so that a corresponding component consists essentially of the light housing with the UV light source, possibly with a separate cover with translucent cutout therein for the light indicator, wherein still an electrical connection for the UV light source protrudes outwards. Other parts are not particularly advantageous. An electrical connection for the UV light source may be a plug connection, either on a projecting cable or on a projecting conductor carrier, on which in turn contacts are provided, to which a connection is made, in particular via a plug.

An inventive electrical appliance has at least one above-described display device, advantageously a plurality of such display devices. The electrical appliance has a display surface, which in particular can also be or form an operating surface or a work surface. Said display device is arranged under the display surface and has a small distance therefrom, which should advantageously be a maximum of 10 mm or even a maximum of 5 mm. If the electrical appliance is an electric hob with a cooking plate which is permeable to light in principle, then several display devices can be used very advantageously.

In an advantageous embodiment of the invention, the cover of a light housing of such a display device may extend parallel to a bottom of the display surface. Preferably, the distance is relatively small, for example, a maximum of 5 mm to 10 mm, more preferably a maximum of 3 mm. Thus, the light display can be particularly well recognized by the display area.

Preferably, in an electrical appliance with a plurality of display devices, these are formed substantially identically with respect to the luminous housing and also the design of the luminous material therein. Only the cutouts in the cover can be designed differently, in order to be able to represent different symbols in each case.

The electrical appliance can, in particular in the form of an aforementioned hob, have at least one display device according to the invention close to a heating device of the electrical appliance. In an electric hob, the heaters are either induction coils or so-called radiant heaters. The display device can advantageously be directly adjacent to the heating device or touching it. Advantageously, it can be provided to attach the display device to the heater or a housing of the heater, such as without tools by clamping or snapping to special fastening devices. For each heating device, a single display device may be provided, alternatively, a plurality of display devices, for example, distributed in the circumferential direction two to six pieces. You can form a so-called hotplate mark or hot indicator.

These and other features will become apparent from the claims but also from the description and drawings, wherein the individual features each alone or more in the form of sub-combinations in an embodiment of the invention and in other fields be realized and advantageous and protectable Represent embodiments for which protection is claimed here. The subdivision of the application in individual sections as well as intermediate headings do not limit the statements made thereunder in their generality.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1

eine seitliche Schnittdarstellung durch ein Kochfeld als erfindungsgemäßes Elektrogerät mit einer erfindungsgemäßen Anzeigevorrichtung,

Fig. 2

eine schräge Draufsicht auf eine erfindungsgemäße Anzeigevorrichtung im fertigen Zustand als Baueinheit,

Fig. 3

die Anzeigevorrichtung aus Fig. 2 ohne Abdeckung,

Fig. 4

einen Längsschnitt durch die Anzeigevorrichtung aus Fig. 2,

Fig. 5

die Darstellung aus Fig. 4 mit angedeutetem Lichtkegel einer einstrahlenden UV-LED,

Fig. 6

eine alternative erfindungsgemäße Anzeigevorrichtung in einer Darstellung ähnlich Fig. 2,

Fig. 7

die Anzeigevorrichtung aus Fig. 6 ohne Abdeckung,

Fig. 8

eine Schrägansicht ähnlich Fig. 3 auf eine weitere alternative erfindungsgemäße Anzeigevorrichtung mit zwei unterschiedlichen Leuchtmaterialien,

Fig. 9

eine Draufsicht auf die Anzeigevorrichtung aus Fig. 8 mit Abdeckung,

Fig. 10

eine seitliche Schnittdarstellung einer weiteren alternativen erfindungsgemäßen Anzeigevorrichtung mit Lichtumlenkung,

Fig. 11

die Schnittdarstellung der Fig. 10 in Schrägansicht und

Fig. 12

die Schrägansicht ohne Schnitt.

Embodiments of the invention are shown schematically in the drawings and are explained in more detail below. In the drawings show:

Fig. 1

a side sectional view through a hob as an inventive electrical appliance with a display device according to the invention,

Fig. 2

an oblique top view of a display device according to the invention in the finished state as a unit,

Fig. 3

the display device off Fig. 2 without cover,

Fig. 4

a longitudinal section through the display device Fig. 2 .

Fig. 5

the presentation Fig. 4 with indicated light cone of a radiating UV-LED,

Fig. 6

an alternative display device according to the invention in a representation similar Fig. 2 .

Fig. 7

the display device off Fig. 6 without cover,

Fig. 8

similar to an oblique view Fig. 3 to a further alternative display device according to the invention with two different luminescent materials,

Fig. 9

a plan view of the display device Fig. 8 with cover,

Fig. 10

a side sectional view of another alternative display device according to the invention with light deflection,

Fig. 11

the sectional view of Fig. 10 in oblique view and

Fig. 12

the oblique view without cut.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In the Fig. 1 an inventive hob 11 is shown as an electrical appliance in the lateral section, in particular as an induction hob. The hob 11 has a hob plate 12 with a bottom 13 to which a heater 15 is pressed or under which the heater 15 is located. The heating device 15 has a flat induction coil 16 which rests or is supported on a flat and large-area support plate 17. Below the support plate 17, an indicated power electronics 18 may be arranged, alternatively, other parts of a supply or control.

On the left and right of the induction coil 16 display devices 20 are arranged, and placed on the support plate 17 and fixed there. An attachment is possible by gluing, alternatively solvable, for example as Verklipsen, locking, jamming or screwing. Similarly, attachment to the induction coil 16 itself is possible or to a support for it, if an additional support such as a plastic support should be present. Of the display devices 20 go each Connecting cable 21 from, and indeed to a corresponding control of the display devices 20. This is not shown here, but for the expert but very easy to imagine.

From the Fig. 2 to 4 is a display device 20 according to the invention in oblique plan view in high magnification visible. The display device 20 is formed as an independent unit or independent component, only electrical connections for the connection cable 21 go from it. A display device 20 has a luminous housing 23, whose interior, as shown in Fig. 3 and then from the partial section of Fig. 4 can be seen, is substantially rectangular or cuboid and elongated. At the front narrow end of a UV-LED 37 is disposed in an opening 40, for example, inserted and thereby possibly clamped or glued. The breakthrough 40 is how the partial section of Fig. 4 shows, into the interior 24, but does not necessarily have to be cylindrical. Alternatively, it can also expand or narrow towards the interior 24. The UV LED 37 radiates predominantly in the UV range, advantageously more than 95% or even more than 99% of the radiation intensity in the UV range, as has been explained above. However, for the scope of protection of the invention, this generally still counts as a UV range or even as a UV light.

The luminous housing 23 has a base plate 25, with which it may be integrally formed. Alternatively, this could also be attached or glued from below. It may also form the floor of the interior. The base plate 25 itself is used mainly for mounting the display device 20 accordingly Fig. 1 ,

The luminous housing 23 has an opening 26 mentioned above upwards or it is almost completely open at the top. An opening edge 27 has a circumferential shoulder. On this lies out Fig. 2 Cover to be seen, which may be glued for attachment to the light-emitting housing 23, alternatively may be latched or jammed. In turn, a cutout 31 is provided in the cover 29, here in a sickle-like shape. The cutout 31 defines, as can be easily imagined, the shape of the optical indicator produced by the display device 20. Thus, a luminous or bright sickle-like symbol is displayed as a visual light indicator.

Below the cutout 31 and in the interior 24, a lighting component 33 is arranged. It may be formed as a separate part and inserted into the luminous housing 23 or its interior 24, wherein it may be jammed, latched or glued. For this purpose, the lighting component is then made of corresponding, aforementioned luminous material with fluorescence educated. It can be formed completely or through and out of such a luminous material. Alternatively, it may be a largely arbitrary plastic, which is coated or painted with such a luminous material. As yet another alternative, it would also be possible, as is easy to imagine, to inject such luminous material into the luminous housing 23 or into the interior 24 or to introduce it as a coating or coating.

The separate luminous component 33 present here has a left side wall region 34a and a right sidewall region 34b, between which a bottom region 35 rising to the rear is provided. Overall, this lighting component 33 is thus trough-shaped and formed in the longitudinal path away from the UV LED rising. From the partial section of Fig. 4 it can be seen why this rising floor area 35 is provided. As a result, a better emission angle between the incident light of the UV LED 37 and the cutout 31 arranged above it can be achieved.

In the Fig. 5 a light cone 39 of the UV LED 37 is indicated by dashed lines. It can be seen that under certain circumstances a part of the upward-going light cone 39 could emerge from the display device 20 through the cutout 31. However, since the UV light is not visible to the human eye, this does not disturb the optical appearance. Furthermore, it can be assumed that a common glass ceramic hob plate 12 does not transmit the UV light because of the material and the dark coloration. Thus, there are no health concerns.

Based on Fig. 2 to 5 It is easily conceivable how the luminous material of the luminous component 33 illuminated by the UV light of the UV LED 37 in accordance with the cone of light 39 in turn emits light upwards in a visible wavelength range by fluorescence, for example red light or yellow light. This light then exits through the cutout 31 and with the cutout 31 upwards. It is then from above accordingly Fig. 1 visible through the hob plate 12 as a visual light indicator. The shape of this optical light indicator is then determined by the cutout 31 as a kind of mask or stencil, as it is known per se, so here sickle-like. The advantage of the invention lies precisely in the fact that by the light conversion due to the fluorescence of the lighting component 33 a very uniform light generation is possible upwards and no complex light redirection including homogenization of the light from an incident light source, such as an LED, is necessary.

From a comparison of Fig. 2 to 4 is also easily seen, as by inserting each standard dimensions having covers 29, each with different cutouts therein, which also several sections can be provided in a cover, in a light and production-friendly way, a variation of the optical indicator is possible. Thus, only different covers must be produced or, depending on the type of production of the cutouts 31 in the covers 29, also full-coverage covers 29 can be produced. In these can then by punching or the like. a cutout 31 are generated.

Alternatively, a cover 29 may be made of translucent material, such as acrylic, and be coated opaque. Then either a correspondingly desired recess corresponding to the illuminated display to be displayed can be provided individually in the opaque coating or the coating can be produced equal to the recess. Alternatively, the shape of the desired optical light display can be worked out again from the coating applied over the entire surface, that is to say the coating is partially removed so that a transparent window is present in the cover.

In the 6 and 7 a second embodiment of a display device 120 according to the invention is shown. This display device 120 also has a luminous housing 123 with an inner space 124 and a base plate 125 for attachment. Upwardly to an opening 126 is provided in the inner space 124 with a circumferential, so to speak graduated opening edge 127. In the opening 126 and the opening edge 127 accordingly Fig. 7 is a cover 129 accordingly Fig. 6 attached, for example glued or clamped. In the cover 129, a cutout 131 is provided. For details, refer to the above description of the Fig. 2 to 5 directed.

In the interior 124, a lighting component 133 is provided which, unlike the lighting component 33 accordingly Fig. 3 , is not elongated in the direction away from a arranged in an opening 140 UV LED 137 as a light source, but very wide and rather short. The side wall portions 134a and 134b are thus relatively short, but the bottom portion 135 is very wide. As a result, a light indicator in the form of the cutout 131 may be closer to an induction coil 16 accordingly Fig. 1 be arranged. The UV LED 137 may be located farther away from the induction coil or other heater. Thus, it is further away from areas of higher or critically high temperatures.

Also with the 6 and 7 For example, the luminous component 133 may be formed as a separate component and inserted into the luminous housing 123. Alternatively, corresponding luminous material with fluorescence properties can be introduced into the luminous housing 123 as a coating or as a coating, possibly also as a multi-component injection molding.

In the alternative display device 220 according to the invention Fig. 8 is similar to the representation of Fig. 3 an independent structural unit according to the invention to see with a luminous housing 223 together with interior 224 on a base plate 225. In the interior 224 a luminous component 233 is arranged, advantageously as a separate inserted part. In a left-hand region, it has a first bottom region 235a made of a first luminous material and in the right-hand region a right-hand bottom region 235b of a second luminous material. The two areas can be the same size, but that is variable. The two luminescent materials of the bottom regions 235a and 235b are different or generate differently colored light upon irradiation with UV light from a UV LED 237 together with connections 238 in an opening 240. The two luminous materials may be glued together or be formed in a two-component injection molding as a lighting component 233, alternatively be painted accordingly.

In the plan view of Fig. 9 to the display device 220 accordingly Fig. 8 a cover 229 is inserted into the opening 226 and advantageously fixed or glued therein. The cover 229 has a cutout 231, which is formed as an elongated wide strip, so to speak as an alternative to the previously shown bent cutouts 31 and 131. The cutout 231 is located exactly above the dividing line between the two bottom portions 235a and 235b, so that from above on the display device 220 in particular after installation in a hob 11 as an electrical appliance accordingly Fig. 1 , a luminous appearance has an outer contour of the cutout 231. However, this outer contour as an elongated luminous stroke is bicoloured, namely just with the two colors of the two bottom regions 235a and 235b. A division with the various luminescent materials of the luminous component 233 may be arbitrary, it does not have to be symmetrical between left and right, so to speak. The subdivision can also be along the longitudinal direction of the luminous component 233 or as desired. In principle, even more differently colored fluorescent materials can be used.

In the presentation of the Fig. 10 With the still further alternative display device 320 according to the invention in a lateral section, it can be seen that here a UV LED 337 is inserted into the display device 320 at a different location and with a different direction of illumination, namely from underneath. It pierces the base plate 325 and lights up in the opening 340 with a substantially vertical direction of illumination. In the upper region of the opening 340 'is bevelled as a funnel-like widening in an interior 324 of the light-emitting housing 323 inside. This interior 324 is closed at the top with a cover 329, similar to the Fig. 4 a cutout 331 is arranged in semicircular form, see also the Figures 11 and 12 , Under this cutout 331, a lighting component 333 is arranged in the interior 324 with a bottom region 335 and a left side wall 324a. This can be just like in the 3 and 4 be formed, alternatively, for a two-color luminous appearance according to the Fig. 8 ,

In order to bring the light from the UV-LED 337 to the luminous material of the luminous component 333, a deflection surface 342 is provided on the underside of the cover 331 above the UV-LED 337. The vertical direction of illumination of the UV-LED 337 is here rotated by about 90 ° to that of Fig. 1 to 9 , Thus, the deflection surface 342 forms an angle of approximately 45 ° with this direction of illumination, and the UV light is in principle irradiated on the illuminating component 333 in exactly the same way as in the previous exemplary embodiments. The light losses by irradiation of the UV-LED 337 on the deflection surface 342 or other deflection surfaces or elongated light guide or the like. are not so large that this would lead to a significant reduction in luminosity.

The cover 329 should be an opaque component except for the cutout 331. The deflection surface 342 can be generated either by the fact that the material, advantageously a plastic, the cover 329 is very smooth and thus reflective. Alternatively, a layer with a particularly good reflection for UV light can be provided here, for example as metallic vapor deposition or as a separately glued metal foil or as a metal platelet, that is to say as a mirror. Alternatively, a good reflective plastic can also be applied.

The advantage of the arrangement of the UV LED 337 in the display device 320 according to the 10 to 12 is that the temperature-sensitive UV LED 337 is further away from an upper side of the display device 320 and thus further away from heat sources corresponding to the hob 11 Fig. 1 available. Such a heat source may be, for example, a hot cooktop plate 12, because a cooking vessel has been heated thereon for a very long time and at high temperatures, so that it causes, so to speak, a downward heating. Alternatively, even in the area of the display device 320, a very hot cooking vessel can be placed, even if on a heating device adjacent to the display device 320 or hotplate has not been cooked at all or no heating process has taken place.

By comparing the Fig. 4 with the 10 and 11 It will be appreciated that the UV LED 337 is significantly further away from an upper surface of the light housing 323, for example, twice or three times the distance. Furthermore, the UV-LED 337 is mainly surrounded by the material of the base plate 325, which in turn is far further away from the top of the light housing 323 and thus of a hot cooktop plate 12 accordingly Fig. 1 ,

In a possible yet further embodiment of the invention, the UV LED 337 could also be placed further down or further away from the deflection surface 342. In addition, separately provided light guide could be provided, whereby the UV LED 337 further away and thus could be arranged in even colder areas.

Claims (15)

Display device for an electrical appliance with: a UV light source for emitting UV light, a light housing having an interior therein, the UV light source radiating into the light housing or into the interior, an opening in the luminous housing towards an upper side, a cover for the light housing for closing the opening with a transparent cutout on the cover, - Luminous material in the light housing or in the interior, which is distributed flat and is designed such that it fluoresces when illuminated with UV light and emits light for transmission through the cutout as a light indicator in the form corresponding to the cut. Display device according to claim 1, characterized in that the cutout is formed as a recess in the cover. Display device according to claim 1 or 2, characterized in that the light housing is light-tight or shielded formed with the cover except for the cutout. Display device according to one of the preceding claims, characterized in that the luminous material is arranged substantially at a distance from the cutout and / or to the cover in the lower region and / or in a remote from the UV light source rear portion of the light housing or the interior , Preferably in a lower portion of the light housing, which faces away from the UV light source. Display device according to claim 4, characterized in that the luminous material is at least partially groove-like with a longitudinal extent along the direction of illumination of the UV light source, wherein a central region of the luminous material along this longitudinal extent is lower and left and right subsequently raised side wall portions are provided Preferably, the side wall portions extend to the opening or to the cover. Display device according to claim 4 or 5, characterized in that the luminous material is formed with increasing longitudinal extent away from the UV light source or the distance to the cover is smaller, especially at the rearmost end with the greatest distance to the UV light source to the top extends to the opening or to the cover. Display device according to one of the preceding claims, characterized in that the luminous material is an independent component, which is installed in the luminous housing, in particular permanently installed. Display device according to one of claims 1 to 6, characterized in that the luminous material is introduced as a coating or as a paint in the luminous housing, in particular on a bottom portion and / or side wall portions of the interior. Display device according to one of the preceding claims, characterized in that the luminous material is designed differently for displaying a plurality of different colors or for different colors different light material is provided, wherein preferably the different colors are provided in separate areas, in particular the areas side by side and are formed adjacent to each other. Display device according to one of the preceding claims, characterized in that a light deflection and / or light guide are provided between the UV light source and the luminous material, wherein preferably the UV light source is arranged below a plane of the luminous material or lower than the luminous material. Display device according to claim 10, characterized in that the UV light source by means of a deflection surface or reflecting surface as a light deflection on the phosphor shines or lights, preferably the deflection or reflection surface causes a light deflection at an angle between 70 ° and 110 ° and obliquely to a light axis of the UV light source runs. Display device according to claim 10 or 11, characterized in that the deflection surface or reflection surface is arranged on the cover, in particular is produced in one piece with this, preferably with an additional surface coating or surface treatment for improved light deflection or reflection of the light of the UV light source towards the luminous material. Display device according to one of the preceding claims, characterized in that the UV light source is inserted into a breakthrough in the light housing, in particular laterally or on a side wall of the light housing below the cover or at the bottom of a bottom with plug-in direction from bottom to top. Electric appliance with at least one display device according to one of the preceding claims, characterized in that the electrical appliance has a display surface, which in particular also forms a control surface or a work surface, wherein the display device is arranged below the display surface and has a small distance thereto, preferably a maximum of 10 mm or 5 mm, wherein preferably the cover of the light housing is parallel to a bottom of the display surface. Electric appliance according to claim 14, characterized in that the electrical appliance has the display device close to the heating device, wherein preferably the heating device is an induction coil, wherein in particular the display device directly adjacent to the heating device or touches them.

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