WATER-BEARING HOUSEHOLD APPLIANCE AND CORRESPONDENTIAL PROCEDURE

Description

[0001] The invention relates to a water-bearing household appliance according to claims 1 and 12 and a method therefor according to claim 13.

[0002] Document DE 10 2012 103 684 A1 discloses a household appliance with a housing that incorporates a projector. The projector is located within the housing and projects an image onto an outer surface of the housing. The projector is equipped with two optics that deflect a light beam emanating from the projector in such a way that the light beam is directed into the interior of a door element of the household appliance. This projects an image onto the inner surface of a viewing window in the door element. Furthermore, a camera is located within the housing of the household appliance and is equipped with another optic. The camera captures the projected image, and two consecutive images captured are evaluated as a single user action.

[0003] A top-loading washing machine with a display unit and a touch control device is described in WO 2018 196 722 A1. The display unit and the touch control device are integrated into a top element of the washing machine. The display unit can be switched between an active mode, in which the user sees a display and can control the washing machine via the touch control device, and an inactive mode, in which the user can see inside the washing machine through the display unit.

[0004] US patent 2012 / 0327201 A1 discloses another top-loading washing machine. The washing machine includes a lid element, which incorporates a display unit. A UV projection unit is located in a spoiler-like element situated in the rear section of the washing machine's lid element, above the lid element, and projects an image onto the lid element. Furthermore, a detection unit for detecting user input is integrated into the spoiler-like element.

[0005] EP 3 543 390 A1 discloses a household appliance with a video projector, wherein the projector is mounted on an outer wall of the appliance's housing or entirely within the appliance's housing. The projector projects light onto a display area on an outer surface of the housing.

[0006] WO 2017 / 122256 A1 discloses a laundry care appliance that has a display unit and a display mounted in the top panel of the housing. The display projection unit, which is intended for outputting the projected image, is also located on the top panel.

[0007] CN 208 562 869 U discloses a water-bearing household appliance that includes a door unit. The door unit has a viewing window and a window element. A cavity is formed between the viewing window and the window element, and a projection unit is arranged in this cavity. The projection unit includes a projector and an optical unit, so that a projection image is projected onto the viewing window.

[0008] German patent DE 10 2015 220 427 A1 discloses a household appliance comprising a display device and a first operating unit, the latter being an operating unit designed as an external touchscreen, wherein the first operating unit is connected via WLAN to a control unit of the household appliance. The display device includes a screen on which, among other things, content from the external device can be displayed.

[0009] JP 2015 019866 A describes a washing machine. The washing machine comprises a door unit and a projector unit. The projector unit projects a projector image onto the door unit. A camera unit is attached to the projector unit. The projector unit and the camera unit are positioned between an outer and an inner door pane of the door unit and emit the projected image. direct to the outer door glass or to the inner door glass of the door unit.

[0010] EP 3 543 390 A1 discloses a household appliance with a video projector, wherein the projector is mounted on an outer wall of the appliance's housing or entirely within the appliance's housing. The projector projects light onto a display area on an outer surface of the housing.

[0011] WO 2017 / 122256 A1 discloses a laundry care appliance that has a display unit and a display mounted in the top panel of the housing. The display projection unit, which is intended for outputting the projected image, is also located on the top panel.

[0012] CN 208 562 869 U discloses a water-bearing household appliance that includes a door unit. The door unit has a viewing window and a window element. A cavity is formed between the viewing window and the window element, and a projection unit is arranged in this cavity. The projection unit includes a projector and an optical unit, so that a projection image is projected onto the viewing window.

[0013] German patent DE 10 2015 220 427 A1 discloses a household appliance comprising a display device and a first operating unit, the latter being an operating unit designed as an external touchscreen, wherein the first operating unit is connected via WLAN to a control unit of the household appliance. The display device includes a screen on which, among other things, content from the external device can be displayed.

[0014] JP 2015 019866 A describes a washing machine. The washing machine comprises a door unit and a projector unit. The projector unit projects a projector image onto the door unit. A camera unit is attached to the projector unit. The projector unit and the camera unit are positioned between an outer and an inner door pane of the door unit and emit the projected image. direct to the outer door glass or to the inner door glass of the door unit.

[0015] The object of the invention is to create a water-bearing household appliance with a clear, simple, modern and cost-effective operating device, while providing improved properties with regard to flexibility.

[0016] The object of the invention is achieved by the features of independent claims 1, 12 and 13. Further advantageous embodiments of the invention are specified in the dependent claims, as well as in the description and the drawings.

[0017] According to one aspect of the invention, the problem of the invention is solved by a water-bearing household appliance comprising a housing and a door unit, wherein the door unit includes a viewing window. Furthermore, the water-bearing household appliance comprises a projection surface, the projection surface being located in the area of ​​the viewing window. The water-bearing household appliance also comprises a projection unit and an operating unit, wherein the projection unit is suitable for projecting a projection image onto the projection surface and wherein the operating unit is designed for operating the water-bearing household appliance, the door unit comprising the projection unit, the projection surface, and the operating unit.Furthermore, the door unit of the water-bearing household appliance has a window element, wherein the window element is arranged opposite the viewing window and wherein the window element projects into the housing in a closed state of the door unit, wherein the viewing window is arranged substantially outside the housing in a closed state of the door unit, wherein a cavity is formed between the window element and the viewing window and at least one optical unit for guiding a light beam generated by the projection unit is arranged in the cavity.

[0018] By arranging the projection unit, projection surface, and control unit within the door unit, the entire door unit can be pre-assembled, resulting in a space-saving design. Furthermore, this design eliminates the need for a traditional display unit, which is typically located in the upper section of the water-bearing appliance. The projection unit allows for cost-effective display options on the projection surface. Additionally, the number of LEDs required can be reduced, as the projection unit only needs one LED to emit a light beam.Another advantage is that at least one optical unit directs the light beam to the projection surface, so that the projection unit can be arranged in such a way that it can be placed in an edge area of ​​the door unit, so that the projection unit can be placed in a hidden area or in an area not visible to an operator of the door unit.

[0019] Since the control unit is integrated into the door unit, it is no longer strictly necessary to provide additional operating elements, such as rotary selectors, switches, buttons, and / or display units with and without touch functionality, on the water-bearing appliance. This allows for greater flexibility in the provision of display variants, thereby simultaneously reducing costs. However, additional operating and / or display units can be installed at any time alongside the projection unit and control unit integrated into the door unit, which primarily serve to display information and data and to control the water-bearing appliance.

[0020] In addition, the projection unit, projection surface and control unit allow new concepts to be implemented easily and quickly, or to be retrofitted into a water-bearing household appliance, for example if it needs to be upgraded.

[0021] Preferably, the door unit of the water-bearing household appliance comprises a first frame element and a second frame element, with the projection unit arranged between the first and second frame elements. This ensures a stable construction of the projection unit and provides it with good protection against moisture.

[0022] Advantageously, a projection film is positioned in the area of ​​the viewing window, with the projection film encompassing at least the projection surface. The projection film is designed to ensure that the projected image is displayed sharply, clearly, and distinctly, so that the operator can see the displayed image clearly.

[0023] To ensure an unobstructed beam path between the projection unit and the optics unit, the optics unit is positioned essentially opposite the projection unit. An unobstructed beam path refers to the free propagation of light emitted by the projection unit.

[0024] Preferably, the optical unit comprises a retaining element and a mirror-like element, wherein the retaining element is arranged on at least one element, the first frame element, the second frame element, or the window element. This ensures that the optical unit and the projection unit remain permanently positioned essentially opposite each other, thereby guaranteeing the transmission or forwarding of the light beam from the projection unit to the optical unit.

[0025] A receiving container is arranged within the housing of the water-bearing household appliance. The optical unit is designed such that, even when the door is closed, the operator of the water-bearing household appliance can see into the receiving container. The arrangement of the optical unit does not impair the operator's usual field of vision into the receiving container, allowing them to see the items being treated while the water-bearing household appliance is in operation.

[0026] Preferably, the control unit comprises a capacitive film and / or a resistive film and / or a camera and / or a photodiode. This ensures that the operator can select from a range of elements displayed on the projection surface, thus enabling simple and quick operation of the water-bearing household appliance. This results in a reduction in the number of display and control unit variants, for example, with regard to the language symbols attached to the display variants.

[0027] The camera and / or photodiode are advantageously arranged in the door unit such that they capture a projected image displayed on the projection surface. This allows one or more operator interactions to be captured and further processed or implemented.

[0028] To provide an operator with a simple and modern display, the water-bearing household appliance further preferably includes a communication unit that communicates with an internal device and / or an external device, wherein the communication unit is configured in such a way that functions of the control unit and / or the projection surface can be transferred to the internal device and / or the external device.

[0029] Advantageously, the communication unit is further configured in such a way that the communication unit receives input commands from the internal device and / or the external device and transmits the input commands to a control device.

[0030] This gives the operator the opportunity to playfully interact with input commands on the internal device and / or the external device in order to select a program that appears optimal to the operator and to transmit this input command via the communication unit of the control device.

[0031] Another aspect of the present invention is to create a water-bearing household appliance according to claim 12.

[0032] This design advantageously results in a larger projection area than is possible with the viewing window. The larger projection area allows for, for example, a larger image to be displayed and / or more information to be shown, if desired. Furthermore, it allows the projected image to be displayed at a different height compared to the height of the door of a water-bearing appliance. For example, the projected image can be displayed higher than the door of a water-bearing appliance, enabling the operator to comfortably operate the appliance while standing.

[0033] Furthermore, a method using a water-bearing household appliance is proposed, in which the projection unit, the projection surface and the control unit are included in a door unit, thereby enabling a modern concept to be realized and a variety of variants to be created while minimizing costs.

[0034] Further features and advantages of the present invention will become apparent from the following description with reference to the drawings. Fig. 1 shows a front view of a water-bearing household appliance; Fig. 2 shows an exploded view of a door unit of a water-bearing household appliance; Fig. 3 shows a sectional view of an embodiment of a door unit of the water-bearing household appliance; Fig. 4 shows a water-bearing household appliance with an internal unit and / or an external unit; Fig. 5 shows a schematic side view of an alternative water-bearing household appliance; Fig. 6 shows a schematic flowchart of a method using the water-bearing household appliance.

[0035] In Fig. 1Figure 1 shows a front view of a water-bearing household appliance 1. The exemplary water-bearing household appliance 1 is a washing machine 3. Alternatively, the water-bearing household appliance could be a washer-dryer or a clothes dryer. Furthermore, the water-bearing household appliance could be a dishwasher, a fully automatic coffee machine, and / or a steam cooker. The following describes the exemplary implementations using the washing machine 3 as an example.

[0036] The washing machine 3 comprises a housing 5. A receiving container 6 is arranged in the housing, which, in the present embodiment, can essentially hold laundry. The housing 5 has a front 7 and side walls 9. An opening 11 is formed in the front 7 of the housing 5. The opening 11 can be closed with a door unit 13. Furthermore, a detergent dispenser 15 is indicated in an upper area of ​​the front 7 of the washing machine 3. Next to the detergent dispenser 15, a switch 17 is located in an upper area of ​​the front 7 of the water-bearing household appliance 1. The switch 17 essentially serves to switch the water-bearing household appliance 1 on or off.

[0037] The door unit 13 is essentially rotatably attached to the housing 5. Fig. 2An exploded view of the door unit 13 is shown. The door unit 13 has a viewing window 19. A projection surface 20 is provided in the area of ​​the viewing window 19. The projection surface 20 can essentially comprise a projection film 21. The projection film 21 can be attached to the viewing window 19. The projection film 21 serves to better display projection images 23. Fig. 1 Projection image 23 is shown as an example. Projection image 23 shows, as an example, a washing program called 'Easy Care', displaying a wash level, a remaining time, and a rotation speed of the drum 6. Furthermore, the door unit 13 includes a control unit 25, which will be discussed in more detail below.

[0038] The door unit 13 further comprises a first frame element 27, a second frame element 29, a window ring 31, and a window element 33. The window element 33 is essentially arranged between the first frame element 27 and the second frame element 29. The window element 33 is essentially received within the second frame element 29. The viewing window 19 is arranged on the first frame element 27. The window element 33 and the viewing window 19 are arranged essentially opposite each other, with the window element 33 projecting into the housing 5, in particular into the receiving container 6 of the water-bearing household appliance 1, when the door unit 13 is closed. The viewing window 19 is arranged essentially outside the housing 5 of the water-bearing household appliance 1 when the door unit 13 is closed. A cavity 35 is formed between the viewing window 19 and the window element 33.

[0039] The cavity 35 essentially contains an optical unit 37 for guiding a light beam 38 (example shown in Fig. 3 (as shown) is arranged on the projection film 21. The light beam 38 is generated by a projection unit 39. The projection unit 39 will be discussed in more detail below. The optical unit 37 essentially comprises a holding element 41 and a mirror-like element 43. The optical unit 37 is arranged in the cavity 35 such that an operator can see into the receiving container 6 of the water-bearing household appliance 1 when the door unit 13 is closed.

[0040] The projection unit 39 is preferably arranged between the first frame element 27 and the second frame element 29. The projection unit 39 is preferably located in a lower region of the first frame element 27. The projection unit 39 can be attached to the first frame element 27 by means of a holding device 40. The projection unit 39 can be arranged on the first frame element 27 such that it is located within the cavity 35 or at least projects into it. However, the projection unit 39 can also be located outside the cavity 35. The optical unit 37 is arranged substantially opposite the projection unit 39, so that, as already mentioned above, light rays 38 generated and emitted by the projection unit 39 are directed via the optical unit 37 onto the projection surface 20.

[0041] The projection unit 39 essentially comprises a projector 45 and a processing unit 47. The processing unit 47 is designed to control the projector 45. Specifically, it is designed to calculate the projection image 23 to be emitted by the projector 45. The projection unit 39 also includes a control unit 49. The control unit 49 is designed to control the projector 45. The control unit 49 can, in particular, be an LCoS control unit. The control unit 49 is designed to display a projection image 23 calculated by the processing unit 47 in such a way that the projector 45 can output the projection image 23 by illuminating the control unit 49. To prevent overheating of the projection unit 39, a cooling unit 51 is integrated into the projection unit 39.The cooling unit 51 is intended to cool at least one other component of the projection unit 39, such as the projector 45, the computing unit 47 and / or the control unit 49.

[0042] The window ring 31 essentially serves to hold the door unit 13 together, and its design is predominantly aesthetic. For example, a handle element 32 can be formed on the window ring 31 if required or desired. Additionally, the window ring 31 serves to secure the first frame element 27 and the second frame element 29 and is essentially designed such that the first frame element 27 and the second frame element 29 are encompassed by the window ring.

[0043] In Fig. 3Figure 1 shows a sectional view of a possible embodiment of a door unit 13 of the water-bearing household appliance 1. The optical unit 37, in particular the retaining element 41 of the optical unit 37, is shown here by way of example mounted in an upper area of ​​the window element 33. This allows the operator to continue to see through the viewing window 19 and the window element 33. The projection surface 20 essentially corresponds to the projection film 21.

[0044] The water-bearing household appliance 1 can be operated via the projection surface 20. As mentioned above, the water-bearing household appliance 1 is operated via the control unit 25. The control unit 25 is equipped with a control device 26 (shown in Fig. 4The control device 26 controls the water-bearing household appliance 1. The control device 26 executes input commands transmitted by the operating unit 25 and transmits information to the projection unit 39, which displays the information in the form of images, in particular projection images 23, on the projection surface 20 or the interaction surface 57. The operating unit 25 essentially comprises a capacitive film 52 and / or a resistive film 53 and / or a camera 54 and / or a photodiode 55.

[0045] The projection surface 20 serves not only to display projection images 23 but also as an interaction surface 57. An operator can control the water-bearing household appliance 1 by means of the interaction surface 57. A capacitive film 52 and / or a resistive film 53 is provided for the interaction surface 57. The capacitive film 52 and / or resistive film 53 is advantageously arranged in the area of ​​the projection surface 20. The capacitive film 52 and / or the resistive film 53 is preferably arranged such that the projection surface 20 is at least partially, and preferably completely, covered by the capacitive film 52 and / or the resistive film 53. This gives an operator the possibility to view all symbols or projection images 23 displayed on the projection surface 20, which, for example, are shown in the following text: Fig. 1The operating principle and / or properties of capacitive films 52 and / or resistive films 53 are shown to be selectable. These are not explained in detail here, as they should be known and the person skilled in the art would choose the film that appears most suitable to them when implementing the present invention.

[0046] It is also conceivable that, in addition to the capacitive film 52 and / or the resistive film 53, a camera 54 and / or photodiode 55 may be provided. It is also conceivable that the capacitive film 52 and / or the resistive film 53 are provided in the water-bearing household appliance 1 together with one or both of them, the camera 54 and the photodiode 55. Alternatively, the camera 54 and / or the photodiode 55 may also be arranged in the water-bearing household appliance 1 instead of the capacitive film 52 and / or the resistive film 53.

[0047] The camera 54 and / or the photodiode 55 are in Fig. 3 For example, the camera 54 and / or the photodiode 55 are arranged in a lower area of ​​the first frame element 27 and / or the second frame element 29. It is also conceivable that the camera 54 and / or the photodiode 55 are integrated into the projection unit 39. Furthermore, it is conceivable that the camera 54 and / or the photodiode 55 are arranged in such a way that an operator's interaction on or at the projection surface 20 or the interaction surface 57 is detected. It is therefore also conceivable that the camera 54 and / or the photodiode 55 are arranged in an upper area of ​​the window element 33. It is also conceivable that the camera 54 and / or the photodiode 55 are arranged in the area of ​​the optical unit 37.

[0048] The optical unit 37 is in Fig. 3The optical unit 37 is arranged, for example, in an upper area of ​​the window element 33 and oriented such that light rays 38 emitted by the projection unit 39 are projected onto the projection surface 20 or the interaction surface 57. For example, the projection surface 20 or the interaction surface 57 is arranged in an upper area of ​​the viewing window 19. However, it is also conceivable that the projection surface 20 or the interaction surface 57 extends over essentially the entire viewing window 19. The optical unit 37 can be arranged or attached to the viewing window 19 by means of various fastening and / or bonding methods or bonding techniques.

[0049] In Fig. 4Figure 1 shows another embodiment of a water-bearing household appliance 1. The water-bearing household appliance 1 has an internal device 59 and / or an external device 61 for communication between an operator or user and the appliance. The internal device 59 and / or external device 61 can be a tablet, smartphone, or the like. Importantly, the internal device 59 and / or the external device 61 includes a touch-sensitive surface and / or a touch-sensitive display for viewing and setting operating and / or program parameters.

[0050] The water-bearing household appliance 1 has a communication unit 63. The communication unit 63 is connected to the internal device 59 and / or the external device 61 and communicates with the internal device 59 and / or the external device 61. The communication unit 63 is configured such that at least projection images 23 and / or the control unit 25 can be transmitted to the internal device 59 and / or the external device 61. This allows the interaction surface 57 and / or a user interface of the water-bearing household appliance 1 and / or the washing machine 3 to be displayed on the internal device 59 and / or the external device 61. It is also conceivable that the external device 61 can be attached to the water-bearing household appliance 1 or that an internal device 59 is formed in and / or on the water-bearing household appliance 1. The internal device 59 can have similar properties to the external device 61.The internal device 59 can include projection images 23 and / or the control unit 25.

[0051] Furthermore, the communication unit 63 is configured to receive input commands from the internal device 59 and / or external device 61 and transmit these commands to the control device 26. This allows the operator to communicate with the water-bearing household appliance 1 and / or the washing machine 3 without having to directly enter an input command at the interaction surface 57 on the water-bearing household appliance 1 and / or the washing machine 3.

[0052] The external device 61 can be a smartphone or a tablet on which the projection images 23 and / or the control unit 25 and / or the interaction surface 57 can be graphically displayed. The internal device 59 can be a processor. However, it is also conceivable that the internal device 59 is a smartphone or a tablet that is detachably connected to the water-bearing household appliance 1 or permanently connected to the water-bearing household appliance 1. The properties of the internal device 59 can be identical to the properties of the external device 61.

[0053] The communication unit 63 can, for example, be located in the door unit 13. The communication unit 63 can be positioned at any location within the door unit. Advantageously, the communication unit 63 should be located in the vicinity of the projection unit 39. However, it is also conceivable that the communication unit 63 is integrated into the projection unit 39. The communication unit 63 can be connected to the projection unit 39 wirelessly or via an electrical connection.

[0054] In Fig. 5 is another embodiment and in Figure 6 A flowchart of a method of the invention is shown. The following descriptive sections are essentially limited to the differences between the exemplary embodiments, whereby with regard to unchanged components, features and functions, reference is made to the description of the exemplary embodiment of the Figures 1 to 4 and Figure 6Reference can be made to the following. To distinguish the embodiments, the reference numerals of the embodiment in the Figures 5 and 6 The additional letter 'a' is appended. With regard to identically designated components, particularly those with the same reference numerals, reference can generally also be made to the drawings and / or the description of the embodiment. Figures 1 to 4 and Figure 6 be referred.

[0055] Fig. 5Figure 1 shows an alternative water-bearing household appliance 1a, which has an alternative door unit 13a. The door unit 13a comprises a control unit 25a and a projection unit 39a with a projector 45a. The projector 45a is capable of projecting a projection image 23a onto a projection surface 20a located outside the water-bearing household appliance 1a. Depending on the orientation of the projector 45a, the projection surface 20a can be located in different positions. The projection surface 20a located outside the water-bearing household appliance 1a forms an interaction surface 57a. The projector 45a is essentially completely arranged or integrated within the door unit 13a of the water-bearing household appliance 1a.

[0056] The projector 45a is located in a lower section of the door unit 13a. In the Fig. 5In the illustrated embodiment, the operating unit 25a comprises a camera 54a and / or a photodiode 55a, which is arranged in the door unit 13a and registers the interactions of an operator and transmits them to the control device 26a. As previously described, the camera 54a and / or a photodiode 55a can be integrated into the projection unit 39a. However, it is also conceivable that the camera 54a and / or a photodiode 55a are arranged in an upper area of ​​the water-bearing household appliance 1a.

[0057] Fig. 6Figure 1 shows a schematic flowchart of some process steps of a process with the washing machine 3 or the water-bearing household appliance 1, 1a. In at least one process step 72, the projection image 23, 23a is output by the computing unit 47 and the control device 49 and by the projector 45, 45a. In at least one further process step 74, the projection image 23, 23a strikes the optical unit 37 and is deflected by the optical unit 37 in the direction of the viewing window 19, in particular onto the projection film 21, or onto the projection surface 20, 20a.

[0058] In at least one further process step 76, the projection image 23, 23a is displayed on the projection surface 20 and / or the projection surface 20a arranged outside the water-bearing household appliance 1a in such a way that it is visible to an operator from outside the water-bearing household appliance 1. In at least one further process step 78, the interaction surface 57, 57a, i.e., the projection surface 20 of the viewing window 19 covered by the projection image 23, 23a and / or the projection surface 20a arranged outside the water-bearing household appliance 1a, is touched by an operator.

[0059] In at least one further process step 80, a control command is transmitted by the computing unit 47 to a control device 26 of the water-bearing household appliance 1, 1a by touching the interaction surface 57 and / or the interaction surface 57a, and an operating mode of the water-bearing household appliance 1, 1a is started or displayed. The operator can set their desired operating program and / or their desired operating parameters of the water-bearing household appliance 1, 1a via the interaction surface 57, 57a and start and / or stop and / or change the operating mode.

[0060] In at least one further process step 82, device information or a new program level, in particular information about the previously started operating mode, is output via the projection unit 39, 39a as a projection image 23, 23a. Here, "program level" means that, for example, when a program is selected, a further program level opens in which further settings can be made.

[0061] This provides the operator with a method by which the operator can conveniently control and operate the water-bearing household appliance 1, 1a via the interaction surfaces 57, 57a. Reference symbol list

[0062] 1. Water-bearing household appliance 3. Washing machine 5. Housing 6. Collection container 7. Front 9. Side panel 11. Opening 13. Door unit 15. Detergent dispenser 17. Switch 19. Viewing window 20. Projection surface 21. Projection film 23. Projected image 25. Control unit 26. Control device 27. First frame element 29. Second frame element 31. Window ring 33. Window element 35. Cavity 37. Optical unit 39. Projection unit 40. Holding device 41. Holding element 43. Mirror-like element 45. Projector 47. Computing unit 49. Control unit 51. Cooling unit 52. Capacitive film 53. Resistive film 54. Camera 55. Photodiode 57. Interaction surface 59. Internal 61. External device 63. Communication unit 72. Procedure step 74. Procedure step 76. Procedure step 78. Procedure step 80. Procedure step 82. Procedure step

Claims

1. Water-bearing household appliance (1, 1a) with a housing (5) and a door unit (13, 13a), wherein the door unit (13, 13a) comprises a viewing window (19), a projection area (20, 20a), wherein the projection area (20, 20a) is provided in the region of the viewing window (19), a projection unit (39, 39a), wherein the projection unit (39, 39a) is suitable for projecting a projection image (23, 23a) onto the projection area (20, 20a), an operating unit (25, 25a), wherein the operating unit (25, 25a) is embodied for operating the water-guiding household appliance (1, 1a), the door unit (13, 13a) comprises the projection unit (39, 39a), the projection area (20, 20a) and the operating unit (25, 25a), characterised in that the door unit (13, 13a) has a window element (33), wherein the window element (33) is arranged opposite the viewing window (19) and wherein the window element (33) protrudes into the housing (5) in a closed state of the door unit (13, 13a), wherein the viewing window (19) is arranged substantially outside the housing (5) in a closed state of the door unit (13, 13a), wherein a cavity (35) is embodied between the window element (33) and the viewing window (19) and at least one optical unit (37) for conducting a beam of light (38) that is generated by the projection unit (39, 39a) is arranged in the cavity (35).

2. Water-bearing household appliance (1, 1a) according to claim 1, characterised in that the door unit (13, 13a) comprises a first frame element (27) and a second frame element (29), wherein the projection unit (39, 39a) is arranged between the first frame element (27) and the second frame element (29).

3. Water-bearing household appliance (1, 1a) according to claim 1 or 2, characterised in that a projection film (21) is arranged in the region of the viewing window (19), wherein the projection film (21) comprises at least the projection area (20, 20a).

4. Water-bearing household appliance (1, 1a) according to one of the preceding claims, characterised in that optical unit (37) is arranged substantially opposite the projection unit (39, 39a), so that the beam of light (38) is conducted from the optical unit (37) onto the projection area (20, 20a).

5. Water-bearing household appliance (1, 1a) according to one of the preceding claims, characterised in that the optical unit (37) comprises a retaining element (41) and a mirror-like element (43), wherein the retaining element (41) is arranged at least on one element, the first frame element (27) or the second frame element (29) or the window element (33).

6. Water-bearing household appliance (1, 1a) according to one of the preceding claims, characterised in that an accommodating container (6) is arranged in the housing (5) of the water-bearing household appliance (1, 1a) and the optical unit (37) is embodied in such a manner that, in a closed state of the door unit (13, 13a), an operator of the water-bearing household appliance (1, 1a) is able to look into the accommodating container (6) of the water-bearing household appliance (1, 1a).

7. Water-bearing household appliance (1, 1a) according to one of the preceding claims, characterised in that the operating unit (25, 25a) comprises a capacitive film (52) and / or a resistive film (53) and / or a camera (54, 54a) and / or a photodiode (55, 55a).

8. Water-bearing household appliance (1, 1a) according to claim 7, characterised in that a capacitive film (52) and / or a resistive film (53) is arranged in the region of the projection area (20, 20a).

9. Water-bearing household appliance (1, 1a) according to claim 7, characterised in that the camera (54, 54a) and / or the photodiode (55, 55a) is arranged in the door unit (13, 13a) in such a manner that the camera (54, 54a) and / or the photodiode (55, 55a) records a projection image (23, 23a), which is displayed on the projection area (20, 20a).

10. Water-bearing household appliance (1, 1a) according to one of the preceding claims, characterised in that the water-bearing household appliance (1, 1a) furthermore comprises a communication unit (63), which communicates with an internal device (59) and / or an external device (61) and wherein the communication unit (63) is configured in such a manner that functions of the operating unit (25, 25a) and / or the projection area (20, 20a) can be transferred to the internal device (59) and / or the external device (61).

11. Water-bearing household appliance (1, 1a) according to claim 10, characterised in that the communication unit (63) is furthermore configured in such a manner that the communication unit (63) receives input commands from the internal device (59) and / or the external device (61) and transmits the input commands to a control apparatus (26) that is provided for actuating the water-bearing household appliance (1, 1a).

12. Water-bearing household appliance (1, 1a) with a housing (5) and a door unit (13, 13a), wherein the door unit (13, 13a) comprises a viewing window (19), a projection unit (39, 39a) with a projector (45a), wherein the projector (45a) is designed so as to project a projection image (23, 23a) onto a projection area (20, 20a), an operating unit (25, 25a), wherein the operating unit (25, 25a) is embodied for operating the water-guiding household appliance (1, 1a), characterised in that the door unit (13, 13a) comprises the projection unit (39, 39a) and the operating unit (25, 25a), wherein the projection area (20, 20a) is provided for displaying a projection image (23, 23a) outside of the water-bearing household appliance (1, 1a) and wherein the door unit (13, 13a) has a window element (33), wherein the window element (33) is arranged opposite the viewing window (19) and wherein the window element (33) protrudes into the housing (5) in a closed state of the door unit (13, 13a), wherein the viewing window (19) is arranged substantially outside the housing (5) in a closed state of the door unit (13, 13a), wherein a cavity (35) is embodied between the window element (33) and the viewing window (19) and at least one optical unit (37) for conducting a beam of light (38) that is generated by the projection unit (39, 39a) is arranged in the cavity (35).

13. Method for operating a water-bearing household appliance (1, 1a) according to one of claims 1 to 12, wherein a projection image (23, 23a) is output by the computing unit (47), the control apparatus (49) and the projector (45, 45a), the projection image (23, 23a) strikes the optical unit (37) and is deflected by the optical unit (37) in the direction of the projection area (20, 20a), so that the projection image (23, 23a) can be seen by a user, by touching an interaction area (57a) that is embodied in the region of the projection area (20, 20a), the user outputs a control command to the control apparatus (49) via the computing unit (47), so that an operating program and / or operating parameters are set, wherein the projection unit (39, 39a) represents an operating mode of the water-bearing household appliance (1, 1a) as a projection image (23, 23a) during operation of the water-bearing household appliance (1, 1a).