Household appliance and method for operating a household appliance

1. A household appliance, comprising:

an operating display unit having at least one visual display and/or acoustic indicator, configured to be activated on or after completion of a treatment cycle at least to display and/or signal completion of the treatment cycle;

a main supply line, wherein a switching element and a power supply unit are connected in series on the main supply line, said power supply unit being configured to supply low voltage power to at least the operating display unit, and said switching element being configured to isolate the power supply unit from an external power supply network; and

a delay element configured to:

1) cause the at least one visual display and/or acoustic indicator to be activated for a predefined time period, and

2) upon completion of the predefined time period, cause a supply of power from the external power supply network to the operating display unit to be interrupted by isolating the power supply unit from the external power supply network via the switching element,

wherein the delay element is configured to receive a deactivation signal and forward the deactivation signal to an actuating device to cause the appliance to be decoupled from the external power supply network by the switching element, and wherein the delay element forwards the deactivation signal after the predefined time period, and

wherein the actuating device is a bistable relay having a relay contact arranged to be connected as the switching element on the main supply line.

2. The household appliance of claim 1 , constructed in the form of a household dishwasher.

3. The household appliance of claim 1 , further comprising an input member connected to the delay element for signal transmission and configured to enable a user to set the time period.

4. The household appliance of claim 3 , wherein the input member is configured for setting to a setting value, at which deactivation of the display is prevented.

5. The household appliance of claim 3 , wherein the input member is configured for setting a further setting value, at which the time period is set to 0.

6. The household appliance of claim 1 , further comprising a controller to generate the deactivation signal in response to the completion of the treatment cycle to deactivate the display and/or indicator with a time delay.

7. The household appliance of claim 6 , wherein the controller is configured to deactivate the operating display unit and the household appliance.

8. The household appliance of claim 1 , further comprising a microswitch which when actuated is configured to bridge the switching element when the switching element is positioned to isolate the power supply unit from the external power supply network.

9. A method for operating a household appliance, comprising:

displaying and/or signaling at least a completion of a treatment cycle using an operating display unit with at least one visual display and/or acoustic indicator;

maintaining the display and/or indicator in an activated state for a predefined time period after completion of the treatment cycle, wherein a switching element and a power supply unit are connected in series on a main supply line, said power supply unit being configured to supply low voltage power to at least the operating display unit, and said switching element being configured to isolate the power supply unit from an external power supply network;

upon completion of the predefined time period, causing a supply of power from the external power supply network to the operating display unit to be interrupted by isolating the power supply unit from the external power supply network via the switching element;

setting the time period by a delay element; and

receiving a deactivation signal with the delay element and forwarding the deactivation signal to an actuating device after the predefined time period, said deactivation signal for decoupling the appliance from the external power supply network by causing the switching element to open,

wherein the actuating device is a bistable relay having a relay contact arranged to be connected as the switching element on the main supply line.

10. The method of claim 9 for operating a household dishwasher.

11. The method of claim 9 , wherein the time period is set by a user by actuating an input member connected to the delay element for signal transmission.

12. The method of claim 11 , further comprising setting the input member to a setting value, at which the display remains activated.

13. The method of claim 11 , further comprising setting the input member to a further setting value, at which the time period is set to 0.

14. The method of claim 9 , further comprising generating the deactivation signal by a controller in response to the completion of a treatment cycle to deactivate the display and/or indicator with a time delay.

15. The method of claim 14 , wherein the controller deactivates the operating display unit or the household appliance.

16. The method of claim 9 , further comprising actuating a microswitch to bridge the switching element when the switching element is positioned to isolate the power supply unit from the external power supply network.