EP3136374A1 - Display device for an electrical appliance, electrical appliance and method for producing this display device - Google Patents

Abstract

A display device (111) for a hob (131) with a planar component carrier and a plurality of block-like light-emitting elements, which have luminous upper sides lying in a common plane, has light sources in the luminous elements and a holding device (119) for the component carrier. The display device (111) has at least one cover (122) over the light-emitting elements of translucent and flexible flat material, which rests on the light upper sides and which is attached to the display device as part thereof and forms a structural unit with this. Thus, it can be avoided that nubs (130) on the underside (129) of an applied glass-ceramic hob plate (128) press into the luminous upper sides and damage them. On the cover (122) an opaque coating is applied with cutouts in the form of symbols for irradiation by means of the lighting elements.

Description

AREA OF APPLICATION AND PRIOR ART

The invention relates to a display device for an electrical appliance, which may also have an operating function under certain circumstances, and provided with such a display device electrical appliance, in particular a hob. Furthermore, the invention relates to methods for producing such a display device.

From the DE 102009036161 A1 It is known to arrange a display device with lighting elements on a component carrier under a hob plate of a hob. These are, for example, so-called seven-segment displays. They shine through the hob plate, which forms a display aperture, and are easy to recognize. In order to achieve the most uniform lighting possible, it is necessary to comply with the same distance to the underside of the hob plate for all lighting elements of a display device. Since it is often not easy to set this distance exactly, the lighting elements are pressed with their luminous tops to the underside of the hob plate. Thus, the luminous tops of all lighting elements are, so to speak, at the same height and equal to the bottom of the hob plate, where they can be pressed against the bottom.

TASK AND SOLUTION

The invention has for its object to provide an aforementioned display device for an electrical appliance, provided with such a display device electrical device and method for producing such a display device with which problems of the prior art can be solved and it is in particular possible, a good To achieve display of a display while ensuring a stable operation of the display device and advantageous manufacturability, in particular to avoid damage to the lighting elements.

This object is achieved by a display device having the features of claim 1, an electrical device having the features of claim 11 and methods having the features of claims 13 and 14. Advantageous and preferred embodiments of the invention are the subject of further claims and are explained in more detail below , It will be some of the features mentioned only for the display device or only for the electrical appliance or only for the methods described. However, they should be able to apply independently of both for the display device as well as for the electrical appliance and for the procedures independently and independently. The wording of the claims is incorporated herein by express reference.

It is provided that the display device has a flat component carrier and a holding device for this component carrier. With this holding device, the component carrier is to be installed in an electrical appliance or attached as a display, so that a holder of the display device takes place within the electrical appliance or on the electrical appliance via this holding device. Furthermore, at least two cuboid or block-like lighting elements are provided on the component carrier for the display. Advantageously, several, in particular most or even all, lighting elements on the component carrier or on a display device are largely identical. The light-emitting elements have luminous upper sides which point away from the component carrier and which point upwards and in particular toward a later display aperture. So these luminous tops are up and above all, the upper surfaces of a display device or a component carrier are in a common plane. In the light elements or below light sources are provided, preferably LED. Under lighting elements with luminous tops should also be understood here general display elements with corresponding display tops, these display elements, if they contain light sources such as LED just form lighting elements. Their tops are then luminous tops accordingly.

According to the invention, it is provided that the display device has at least one cover over the luminous elements, which consists of translucent and flexible or soft or elastic flat material. This cover rests on the luminous upper sides of the luminous elements, advantageously to a large extent or with more than 50% of the area of the luminous upper sides, in particular covering all luminous upper sides of all luminous elements on the component carrier. The cover is attached to the display device and thus a part of this. On this attachment will be discussed in more detail below. Finally, the cover with the display device forms a structural unit. For example, the display device or this unit can later be installed in an electrical appliance, for example a hob.

By providing the translucent and flexible sheet material as a cover can thus a kind of protective layer or leveling layer or matching layer between the luminous element or Leuchtoberseite and a bottom of a display bezel or cover or the like., Which extends over the display device to be created. For example, unevenness can be compensated for and / or a protective function can be achieved.

Preferably, the cover has an upper side and a lower side. With the bottom it rests on the luminous top of the lighting elements, and with the top it can rest against the underside of a display bezel of an electrical appliance, for example, a hob plate of a hob, under which the display device is arranged.

In a first basic embodiment of the invention, the luminous top of a luminous element can be provided with an opaque coating. This coating has at least one cutout per luminous element for the illuminated display. Here, no coating is provided or light can occur in the appropriate form due to the section of the luminous element. Thus, a substantially large-area or full-surface coating of the luminous upper side can first take place, and then this coating is worked out with a specific pattern or a specific symbol shape as a cut-out or here the coating is removed. Such a removal of a coating is carried out particularly advantageously with laser. Since the coating is opaque, a light transmission is now given in the exposed areas or sections above the luminous top. The light can radiate through an overlying translucent or transparent cover. Alternatively, the coating can also be applied with a cutout in the form of a symbol, letter form or number form on the upper side of the luminous element for radiating through this section by means of an underlying luminous source.

In a second basic embodiment of the invention, the cover may be provided on the top and / or bottom with an opaque coating, the coating over at least one light element has a cutout in symbol form, letter form or number form for irradiating the section by means of the underlying luminous element. In an alternative embodiment, the opaque coating could also be applied to the luminous upper sides of the luminous elements, but this is considered less advantageous here.

On the one hand, according to the invention, it is possible here for the opaque coating to be applied to an upper side and / or a lower side of the cover, thereby releasing the cutouts immediately during production. Then the coating becomes equal in the desired shape with certain patterns or specific symbol shapes as cutouts and is then finished, so to speak.

On the other hand, according to the invention, it is possible to produce the cutout by removing a part of the coating which was originally also applied over the cutout to the cover or over a large area or over the entire surface. In particular, removal of the coating by means of laser is considered to be very advantageous. This is known in principle for individual lighting elements, see, for example, the aforementioned DE 102009036161 A1 , Thus, there is first a substantially large-area or full-surface coating of the cover, wherein it is generally subordinate whether this is done on the top or the bottom. Then this coating is processed with certain patterns or specific symbol shapes as cutouts or here the coating is removed.

In a method for the subsequent removal of regions of the coating to produce the cutouts, the coating can first be applied to the top of the cover before the cover is fastened above the luminous elements or on the display device. Then the cutouts can be produced depending on the variant in the cover by removing the coating in the desired shape, advantageously by means of laser. So you do not have to produce several different variants. And above all, it is possible to dispense with a variant-dependent production of the luminous elements, which otherwise have a coating or masking or the like. would be provided, which is variant-dependent.

Since the coating is opaque to light, there is now a light transmission above one or more light-emitting elements in the released or uncovered areas or cut-outs. These not only appear as simple mostly rectangular illuminated areas, but cause the display of illuminated or luminous patterns or symbol shapes.

In an embodiment of the invention, thin and / or elongated projections in the manner of ribs or webs can protrude downwards on the underside of the cover and engage between at least two lighting elements. They are advantageously integrally formed on the underside. You can thus avoid overshoot between individual lighting elements. In this case, the webs may extend at least to below the luminous upper sides of the luminous elements, preferably down to at least half the height of the luminous elements.

Advantageously, the display device has a single cover, so that only a single part must be attached or attached to the display device. Particularly advantageous, the cover extends consistently over the lighting elements. This means that a cover covers or passes over a plurality of lighting elements or all lighting elements of the display device. In this case, the cover can cover at least 50% of the surface area of the component carrier, wherein it expediently forms a substantially closed and simply formed surface, for example essentially a rectangle. This area then extends only so far above the component carrier, as is necessary to cover the lighting elements. Thus, it is not the entire component carrier or its holding device or the entire display device must be covered by the cover.

In the first basic embodiment of the invention, the cover is advantageous overall translucent or transparent and can be virtually not perceived from above. Due to the translucency of the cover in the manufactured cutouts with patterns or symbol shapes in the second basic embodiment of the invention, it can not be perceived virtually from above or disturbs the display function of the display device here. It forms a kind of masking to represent illuminated symbols, numbers or letters. Further good optical properties of the display can be achieved in that the cover at least above the lighting elements has a flat top and / or a flat bottom. This also improves a uniform contact of the lighting elements on a lower side of a display bezel. Advantageously, the cover has a constant or constant thickness, for example, everywhere over the luminous elements. The thickness can be relatively small and not more than 5 mm. Advantageously, it is 0.2 mm to 2 mm, particularly advantageously 0.4 mm to 0.8 mm.

For attachment, the cover on at least two sides, which may be in particular opposite sides, be attached to the component carrier and / or on the holding device. Thus no complex, for example, circulating frame needs to be provided for the cover, which holds it everywhere. An attachment of the cover on the holding device or on the component carrier may advantageously be positive fit. Particularly advantageous is a positive fastening solvable or can be solved manually again, for example, for repair purposes. For example, it is possible to provide a latching or clamping connection which is produced automatically when it is put on.

In a further embodiment of the invention, it is possible that the cover along at least two sides, particularly advantageous exactly along two sides, one down has drawn edge. This can be narrow, but it can also be so wide that it occupies almost the height of the holding device. At this edge fastening means for the aforementioned locking or clamping connection of the cover are advantageously provided on the holding device.

A possible material for the production of the cover is silicone, so that the cover can be made of silicone or consists thereof. This is as transparent as possible transparent silicone, particularly advantageous just transparent except for the aforementioned cover or coating. It should be relatively soft and may more preferably have a hardness of 50 to 70 Shore (A), preferably about 60 Shore (A). It is preferably also electrically insulating and thermally insulating.

In a further embodiment of the invention, the cover can thus be designed as a kind of mat or mat-like, preferably with a rectangular base. The cover may not be particularly dimensionally stable due to the material used, especially in soft or elastic silicone. It can preferably achieve its essential dimensional stability when it is attached to the holding device or to the component carrier, that is to say to the display device. Even then, their stability is essentially necessary only in the direction of pressure on the cover or the display device from above.

In an advantageous embodiment of the invention, the component carrier has capacitive sensor elements in order to form a capacitive touch switch on the display device. By placing a finger on a panel in front of the capacitive sensor element, a switching operation can be triggered. This is for example from the aforementioned DE 102009036161 A1 and especially from the EP 2809006 A1 known. The capacitive sensor elements should lie approximately in the same plane or extend in this plane as the luminous upper sides of the luminous elements. Advantageously, the capacitive sensor elements are still slightly above the luminous upper sides. They should exceed this by at least 1 mm. However, not only the luminous top should rest against the cover or be covered by this, but also the sensor elements.

Advantageously, a capacitive sensor element is arranged on the upper side of a luminous element or on top of the luminous element. It is particularly advantageously arranged laterally next to the luminous upper side or surrounds the luminous upper side. In this case, the capacitive sensor element can have a plurality of narrow longitudinal sections or even only pin-like projections, that is to say does not have to be a coherent surface, as is the case with the aforementioned EP 2809006 A1 shows.

Thus, the capacitive sensor element or its sections can be arranged laterally next to the luminous upper side or approximately surround the luminous upper side.

In an advantageous embodiment of the invention, the luminous top is not dominated by any other component on the component carrier of the holding device, if you do not count the cover here. Advantageously, the luminous top is surmounted only by the capacitive sensor elements, if any such are provided. However, this projection can be low and at most 2 mm, advantageously 0.7 mm to 1.5 mm.

In an embodiment of the invention, an inventive electrical device with a display device described above on a display bezel. Under this display panel, a display is produced with a display device according to the invention, with the light elements as the light source and the cover with the opaque coating with the openwork patterns or symbol shapes therein. This display panel runs over the display device and closes it or makes it suitable for use and possibly very robust for the desired use. The display device is pressed from below to the display bezel and thus abuts on the bottom. This has the advantage of the aforementioned exact definition of the distances between the luminous elements and the underside of the display bezel.

In a further embodiment of the invention, it may be provided that the electrical appliance is a hob and has a hob plate, which then serves as a display screen. In this case, the display device is pressed against the underside of the hob plate, which is advantageously a glass ceramic hob plate. It can be provided that the cooktop panel has on its underside a structure which has elevations and depressions. This is usually formed in a glass ceramic cooktop as a kind Noppung, as the DE 4104983 C1 shows. The elevations should have a maximum height of 1 mm, advantageously only about 0.1 mm to 0.7 mm. The cover then rests in the recesses between the protrusions on the underside of the hob plate. Thus, the cover may serve as a kind of leveling or compensation for the uneven structure on the underside of the cooktop panel or, alternatively, on another display panel. In addition to a possible improvement of the visual appearance by balancing these elevations and depressions, whereby these are partially or even largely optically leveled so that they are actually no longer visible, it is possible to prevent the pressing of the structure or before all of the surveys on the aforementioned coating of the luminous top damage incurred in it. These damages could go so far that the coating at unwanted places pushed through or scratched and thus translucent and thus results in a visually not very appealing design. This is because light can then escape in an undesired way. If the cover has the opaque coating on its upper side and thus lies against the underside of the hob plate, make sure that it is as scratch-resistant as possible and that it is not moved very much.

In addition to the function of leveling or compensation, the cover in the second basic embodiment of the invention can provide for the representation of the symbols, letters or numbers by means of the masking or coating. It can therefore provide the details of the display or indicator light.

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 Schrägansicht von oben auf eine erste grundsätzliche erfindungsgemäße Anzeigeeinrichtung mit Abdeckung,

Fig. 2

die Anzeigeeinrichtung aus Fig. 1 ohne die Abdeckung,

Fig. 3

eine Leiterplatte als Bauteilträger der Anzeigeeinrichtung aus Fig. 1,

Fig. 4

eine Schrägansicht von oben auf eine zweite grundsätzliche erfindungsgemäße Anzeigeeinrichtung mit Abdeckung mit Ausschnitten in Form von Symbolen, Buchstaben und Zahlen,

Fig. 5

die Anzeigeeinrichtung aus Fig. 4 ohne die Abdeckung,

Fig. 6

eine Leiterplatte als Bauteilträger der Anzeigeeinrichtung aus Fig. 4,

Fig. 7

eine Schrägansicht eines Leuchtelements für eine Anzeigeeinrichtung entsprechend den Fig. 1 bis 6 mit auf der Oberseite angebrachten, rippenartigen kapazitiven Sensorelementen,

Fig. 8

eine Draufsicht auf eine Unterseite einer Glaskeramik-Kochfeldplatte mit Noppen,

Fig. 9

eine Seitenansicht eines erfindungsgemäßen Kochfelds mit einer Glaskeramik-Kochfeldplatte entsprechend Fig. 8, an deren Unterseite die Anzeigeeinrichtung aus Fig. 1 oder 4 angedrückt ist,

Fig. 10

eine Ausbildung eines Kochfelds entsprechend Fig. 9 gemäß dem Stand der Technik ohne Abdeckung und

Fig. 11

eine stark schematische Vergrößerung eines Ausschnitts aus Fig. 9.

An embodiment of the invention is shown schematically in the drawings and will be explained in more detail below. In the drawings show:

Fig. 1

3 is an oblique view from above of a first basic display device according to the invention with cover,

Fig. 2

the display device off Fig. 1 without the cover,

Fig. 3

a circuit board as a component carrier of the display device Fig. 1 .

Fig. 4

3 is an oblique view from above of a second basic display device according to the invention with cover with cutouts in the form of symbols, letters and numbers,

Fig. 5

the display device off Fig. 4 without the cover,

Fig. 6

a circuit board as a component carrier of the display device Fig. 4 .

Fig. 7

an oblique view of a lighting element for a display device according to the Fig. 1 to 6 with rib-like capacitive sensor elements mounted on top,

Fig. 8

a top view of an underside of a glass ceramic hob plate with knobs,

Fig. 9

a side view of a hob according to the invention with a glass ceramic hob plate accordingly Fig. 8 , on the underside of the display device Fig. 1 or 4 is pressed

Fig. 10

a training of a hob accordingly Fig. 9 according to the prior art without cover and

Fig. 11

a strongly schematic enlargement of a detail from Fig. 9 ,

DETAILED DESCRIPTION OF THE EMBODIMENTS

In the Fig. 1 to 3 a display device 11 is shown in a first basic embodiment of the invention, in which Fig. 1 Specifically, a holding device 19 for a printed circuit board 13 with a cover 22. The circuit board 13 may be a conventional circuit board and has arranged thereon lighting elements 15 and display elements, as for example from the EP 2809006 A1 in block-like form are known. You can include the aforementioned light sources. The lighting elements 15 are here assembled, but are advantageous in itself items. Alternatively, one of the rows of luminous elements can also be regarded as a single luminous element. The lighting elements 15 each have luminous tops 16, which have an opaque coating mentioned at the outset, which is mounted on the actually translucent upper side and ensures that no light can escape from inside or below. In this luminous top 16 then at least partially symbols 17 are formed, for which the coating has been removed, for example by laser. This is known per se from the prior art, see, for example, the aforementioned DE 102009036161 A1 , The symbols 17 can be numbers, letters or any other symbols or surfaces. So that this coating can be removed on the light top 16 by means of laser, it should not be too strong or stable and resistant. Therefore, there is the problem mentioned at the outset that damage to a structure on the underside of a display panel, in particular nubs of a glass-ceramic cooktop panel, can occur. This damage can even go so far that the coating is so severely diluted or pushed through or even damaged that light can escape unintentionally.

The printed circuit board 13 is arranged in a receiving-like holding device 19, as is known per se and need not be further explained here. The holding device 19 has a circumferential wide edge on which hook-like projections 20 are provided on the opposite longitudinal sides.

As the Fig. 1 in comparison to Fig. 2 shows, a cover 22 is substantially flat and flat with a cover surface 23, approximately in the manner of a rectangle, and covers a large part of the circuit board 13. The cover 23 has a constant thickness, for example, 0.4 mm. On both longitudinal sides, the cover 22 has a downwardly depending edge 24 with each of the projections 20 matching recesses 25. Thus, the cover 22 can be pulled over the holding device 19 with the circuit board 13 therein or slipped and fastened, so to speak. This will make the in Fig. 1 shown assembly of the finished display device 11 is formed. This display device 11 can then, like the FIGS. 6 and 8th show, in an electrical appliance, advantageously a hob, to be installed.

In the 4 to 6 a display device 111 is shown in a second basic embodiment of the invention, in which Fig. 4 Specifically, a holding device 119 for a printed circuit board 113 with a cover 122. The circuit board 113 may be a conventional circuit board and has arranged thereon lighting elements 115, as for example from the aforementioned EP 2809006 A1 in block-like form are known. The lighting elements 115 are assembled here, but are advantageous in itself items. Alternatively, one of the rows of luminous elements can also be regarded as a single luminous element. The lighting elements 115 each have luminous upper sides 116. These light up in the illuminated state on their entire surface upwards and thus form a kind of luminous or radiant rectangle.

The printed circuit board 113 is arranged in a receiving-like holding device 119, as is known per se and need not be explained further here. The holding device 119 has a circumferential wide edge, on which hook-like projections 120 are provided on the opposite longitudinal sides.

As the Fig. 4 in comparison to Fig. 5 1, a cover 122 is substantially planar and flat, approximately in the manner of a rectangle, and covers a majority of the printed circuit board 113. It has a prescribed coating 123, which has approximately constant thickness, for example 0.01 mm to zero , 5 mm. The coating 123 is applied over the entire surface of the top of the actually translucent cover 122 and ensures that from the inside or down no light can escape from the light elements except at cutouts 117 in the form of specific symbols, letters or numbers. That's what the coating is for with the respective shape has been removed, for example by laser. This is known per se from the prior art, see also the aforementioned DE 102009036161 A1 , When fluoroscopy by means of the areal lighting elements 115 from below, a luminous appearance visible from above results only in the form of the symbols 117.

The symbols 117 may be numbers, letters or any other symbols or surfaces. In order for this coating 123 on the top of the cover 122 to be removed by laser, it should not be overly strong and stable. Therefore, there is the problem mentioned at the outset that damage to a structure on the underside of a display panel, in particular nubs of a glass-ceramic cooktop panel, can occur. This damage can even go so far that the coating is so much diluted or pushed through or even damaged, so that light can escape unintentionally. In the Fig. 4 Symbols 117 shown are then corresponding to a finished electrical appliance, in particular a hob 131 Fig. 9 and 11 to see from above when irradiated by means of the light-emitting elements 115, as is known per se.

The symbols 117 may have been released immediately when the coating 123 is applied to the cover, ie, so to speak, have been produced simultaneously with the coating 123. Alternatively, the coating 123 is applied over a large area or over the entire surface, the symbols 117 subsequently being produced in the form of numbers, letters or any other symbols by removal of the coating. For this, the coating 123 is advantageously applied to the top of the cover 122, because then this removal can take place even after attaching the cover on the light-emitting elements 115 and on the holding device 119. Thus, a variant-dependent production or processing of the cover 122 is really possible.

On both longitudinal sides, the cover 122 has a downwardly depending edge 124 on each of the projections 120 matching recesses 125. Thus, the cover 122 can be pulled over the holder 119 with the circuit board 113 therein or slipped and fastened, so to speak. This will make the in Fig. 4 shown assembly of the finished display device 111 formed. This display device 111 can then, like the Fig. 9 and 11 show, in an electrical appliance, advantageously a hob, to be installed.

In the Fig. 7 is a possible alternative light-emitting element 115 'is shown, which is also formed substantially block-like or cuboid, in particular according to the aforementioned EP 2809006 A1 , At the top of the luminous element 115 'are rib-like Capacitive sensor elements 118 formed of molded elastomeric material. This is electrically conductive and electrically contacted down to the circuit board 113, as is known in the prior art. Even with these capacitive sensor elements 118 there is the problem that they may not fit properly when placed against the structured underside of a panel, in particular an aforementioned glass ceramic cooktop panel, because of the mentioned knobs. Then, the operation of a capacitive touch switch formed thereby can be greatly impaired.

In the Fig. 8 In bottom view, a glass-ceramic cooktop panel 128 is shown. It has a self-level bottom 29, protrude from the round or oval knobs 130. These nubs 130 have a regular arrangement with a few millimeters distance and even a height between 0.1 mm and a maximum of 1 mm. The knobs 130 are provided by design for such glass ceramic cooktop panels 128, but at the same time prepare the aforementioned problems by the non-planar bottom of the glass ceramic cooktop plate 128. The sectioned magnification of Fig. 11 shows these pimples even more clearly.

In Fig. 9 is shown in the assembled state, a section of a hob 131. At the bottom 129 of the glass ceramic hob plate 128 is a display 111 from Fig. 4 pressed, for example, with the springs 133 underneath which press on the underside of the holding device 119 and rest on a cooktop housing, as is known from the prior art. Alternatively, a display device 11 accordingly Fig. 1 be installed in the hob 131.

Under the glass ceramic cooktop plate 128 also more functional units such as especially heaters are arranged, which are not shown here, because they also play no role. It can be seen that the display device 11 or 111 rests with the full surface or coating 123 of the cover 122 on the underside 129 of the glass-ceramic hob plate 128. Naturally, like the Fig. 11 in enlargement shows the knobs 130 in the coating 123.

The illustration of a conventional hob 231 'of Fig. 10 shows how a display device 211 'with light elements 215 is normally pressed against a lower side 229' of a glass-ceramic cooktop panel 228 'provided with nubs 230'. The lighting elements 215 may correspond to those of the invention and also have luminous tops. The lighting elements 215 are pressed with their luminous tops directly from below to the bottom 229 'of the glass ceramic hob plate 228'. Thus, therefore, their nubs 230 ' partly directly on the luminous tops and can push through, scratch or damage them. Thus, the aforementioned unwanted light phenomena or candling or blurring may occur in a generated illuminated symbolism. This should just be avoided with the invention.

In the Fig. 11 is an enlarged section corresponding to the Fig. 9 shown. On the circuit board 113 is on the left a normal light-emitting element 115 accordingly Fig. 5 and 6 shown. On its overhead light side 116, the cover 122 is pressed. This is evident from the fact that the luminous element 115 with its luminous upper side 116 is pressed into the cover 122 a bit. Due to the flexibility or softness of the material of the cover 122, this is not a problem. Furthermore, it can be seen here that in the luminous element 115 an LED 114 is mounted on the printed circuit board 113 in order to irradiate the luminous element 115 upwards. In this case, the translucent or transparent cover 122 with the symbol 117 above in the actually opaque coating 123 and the glass ceramic hob plate 128 are irradiated, so that a lit symbol 117 on the top of the glass ceramic hob plate 128 and the hob 131 to see is.

To the right of the luminous element 115, a modified luminous element 115 'is corresponding Fig. 7 shown. It has on the upper side the upward capacitive elastic sensor elements 118. They are slightly exaggerated here, because of their narrow dimension stronger pressed into cover 122.

First of all is from the Fig. 11 also to recognize how the cover 122 adapts at its top to the knobs 130 on the bottom 129 of the glass ceramic hob plate 128. Namely, it lays itself largely on the underside 129, which forms recesses between the knobs 130, as it were. This is important, so that no possible air pockets are present or no air boundary layer transitions of the light take place, but this can enter, so to speak, directly from the light elements 115 through the cover 122 and the symbols 117 in the coating 123 in the material of the glass ceramic cooktop plate 128 , Another point as to why the least possible air bubbles and the best possible and full-surface system should be present, is that otherwise the function of the capacitive sensor elements 118 would be functionally limited at the light-emitting element 115 '. By a suitable choice of the material for the cover 122 but a sufficiently good adaptability can be achieved. For this purpose, as the material for the cover 122, a naturally transparent, electrically insulating and as flexible as possible plastic is selected, advantageously containing silicone or silicone. Because of this, namely, an advantageous heat resistance for use in the hob 131 can be achieved. Especially if a hot pot is placed on the area above the display device 111, where, so to speak, the glass-ceramic cooking plate 128 forms a display pot, the temperature radiation downwards and the heat conduction may cause possible damage to the lighting elements 115. Through the cover 122, this problem can be greatly reduced.

Claims (15)

Display device (11, 111) for an electrical appliance with a flat component carrier, at least two cuboidal or block-like lighting elements on the component carrier for a display,
wherein the luminous elements have luminous upper sides which point away from the component carrier and lie in a common plane, - light sources in the lighting elements, a holding device for the component carrier, characterized in that - The display device (11, 111) has at least one cover over the light-emitting elements, wherein the cover consists of translucent and flexible sheet material, - The cover rests on the luminous top, - The cover is attached to the display device as part of the same, - The cover with the display device forms a structural unit. Display device (11) according to claim 1, characterized in that the luminous upper sides are provided with an opaque coating which has at least one section without a coating per luminous element, wherein preferably the luminous upper side or the coating of neither another component on the component carrier of the Holding device is surmounted, in particular only by the capacitive sensor element. Display device (111) according to claim 1, characterized in that the cover has an upper side and a lower side and rests with the underside on the luminous upper sides of the luminous elements, wherein the cover is provided on the upper side and / or the underside with an opaque coating, wherein the coating on at least one luminous element has a cutout in symbol form, letter form or number form for irradiation of the cutout by means of the underlying luminous element, wherein preferably the cutout has been prepared by removing a portion of the coating, which was originally also applied to the cover over the cutout , in particular by removing the coating by means of laser. Display device according to claim 3, characterized in that project on the underside of the cover thin projections in the manner of ribs or webs down and engage between at least two light elements, wherein the webs at least extend to below the luminous top of the light elements, preferably down to at least half height of the lighting elements. Display device according to one of the preceding claims, characterized in that the display device (11, 111) has a single cover, wherein the cover preferably extends continuously over the lighting elements and in particular covers at least 50% of the surface of the component carrier. Display device according to one of the preceding claims, characterized in that the cover has a flat upper side and / or a planar underside above the luminous elements, preferably of constant thickness. Display device according to one of the preceding claims, characterized in that the cover at at least two sides, preferably opposite sides, is fastened on the component carrier and / or on the holding device for the component carrier, in particular form-fitting manner, where it is preferably releasably secured form fit by means of a when placing automatically produced locking or clamping connection. Display device according to claim 7, characterized in that the cover has along at least two sides extending downwardly drawn edge, in particular to below the component carrier, preferably with fastening means for the latching or clamping connection. Display device according to one of the preceding claims, characterized in that the cover comprises silicone or consists of silicone, preferably with a hardness of 50 to 70 Shore (A), in particular 60 Shore (A). Display device according to one of the preceding claims, characterized in that the component carrier has capacitive sensor elements for forming a capacitive touch switch on the display device, wherein preferably the capacitive sensor elements lie approximately in the same plane as the luminous upper sides of the luminous elements or slightly above, in particular a capacitive sensor element the upper side of a luminous element or is arranged at the top thereof, wherein preferably the capacitive sensor element is arranged laterally adjacent to the luminous upper side or surrounds the luminous upper side. An electrical appliance (131) having a display device (11, 111) according to one of the preceding claims, wherein the electrical appliance has a display end (128) under which the display device (11, 111) is arranged, the display device thereby engaging with the cover (22, 122) is pressed against the underside (129) of the display panel (128) and thus abuts against this underside (129). Electric appliance according to claim 11, characterized in that it is a hob (131) with a hob plate (128) as a display bezel, wherein the display device (11, 111) is pressed against the underside (129) of the hob plate, wherein preferably the hob plate (128 ) has on the underside (129) a structure with elevations (130) and depressions, in particular at most 1 mm in height, and the cover (22, 122) in the recesses between the elevations (130) on the underside (129) of the cooktop plate ( 128) is applied. A method of producing a display device (11, 111) according to claim 2 or 3, characterized in that the opaque coating (23, 123) on a luminous top (16) of the luminous element (15) or on an upper side and / or a lower side of the cover (122) is applied, wherein upon application of the opaque coating (23, 123) on the luminous top (16) or on the cover (122) the cutouts (17, 117) are released. Method for producing a display device according to claim 2 or 3, characterized in that the opaque coating (23, 123) is applied to a luminous upper side (16) of the luminous element (15) or to an upper side and / or a lower side of the cover (122) , wherein the cutouts (17, 117) are produced only after application by removing the coating (23, 123). A method according to claim 14, characterized in that the coating (23, 123) for producing the cutouts (17, 117) is removed by means of laser irradiation, wherein preferably the coating (117) is applied to the top of the cover (122) and after attaching the cover (122) over the light elements (115) or on the display device (111), the cutouts (117) are produced by removing the coating (123).

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