WO2012175336A2 - Dispositif de commande et d'affichage capacitif pour appareil électroménager et appareil électroménager comprenant un tel dispositif de commande et d'affichage - Google Patents

Dispositif de commande et d'affichage capacitif pour appareil électroménager et appareil électroménager comprenant un tel dispositif de commande et d'affichage Download PDF

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Publication number
WO2012175336A2
WO2012175336A2 PCT/EP2012/060706 EP2012060706W WO2012175336A2 WO 2012175336 A2 WO2012175336 A2 WO 2012175336A2 EP 2012060706 W EP2012060706 W EP 2012060706W WO 2012175336 A2 WO2012175336 A2 WO 2012175336A2
Authority
WO
WIPO (PCT)
Prior art keywords
display device
display
operating
capacitive
sensor electrode
Prior art date
Application number
PCT/EP2012/060706
Other languages
German (de)
English (en)
Other versions
WO2012175336A3 (fr
Inventor
Dietmar Bruß
Thomas Ludenia
Robert LÖBS
Peter Vogelsang
Original Assignee
BSH Bosch und Siemens Hausgeräte GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BSH Bosch und Siemens Hausgeräte GmbH filed Critical BSH Bosch und Siemens Hausgeräte GmbH
Priority to DE112012002569.5T priority Critical patent/DE112012002569A5/de
Publication of WO2012175336A2 publication Critical patent/WO2012175336A2/fr
Publication of WO2012175336A3 publication Critical patent/WO2012175336A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches
    • H03K17/9622—Capacitive touch switches using a plurality of detectors, e.g. keyboard
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/96—Touch switches
    • H03K2217/9607—Capacitive touch switches
    • H03K2217/960755—Constructional details of capacitive touch and proximity switches
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/96—Touch switches
    • H03K2217/9607—Capacitive touch switches
    • H03K2217/960785—Capacitive touch switches with illumination

Definitions

  • Household appliance and household appliance with such a control and display device with such a control and display device
  • the invention relates to a capacitive control and display device for a household appliance, which has a display window with a touch-sensitive control surface. On the display window - for example on the control surface - a display symbol is attached. Behind the display window is a lighting element, which is used to emit light to backlight the display symbol, such as the display window.
  • the capacitive operating and display device also includes a capacitive sensor electrode, which is part of a contact capacitor - the second capacitor plate is formed by the finger of the operator when touching the operating surface. The sensor electrode is arranged at a distance from the operating surface. When touching the operating surface, a capacitance of the contact capacitor changes.
  • the invention also relates to a household appliance with such a capacitive control and display device.
  • a touch-sensitive or touch-sensitive LED display In such displays, a lighting element - such as LED - is used by means of which a display symbol or function icon can be illuminated, which is attached to the control surface - touch surface - of the display window and symbolizes a function of the household appliance. Behind the display window and a sensor electrode may be arranged, which is coupled to an evaluation. If the operating surface of the display window is touched with a finger, the capacitance of a contact capacitor formed by the sensor electrode on the one hand and the finger on the other hand changes. This change in capacity is then detected by the transmitter and evaluated as operation. Now the function of the household appliance is triggered, which can be signaled by backlighting of the display symbol.
  • a lighting element - such as LED - is used by means of which a display symbol or function icon can be illuminated, which is attached to the control surface - touch surface - of the display window and symbolizes a function of the household appliance.
  • Behind the display window and a sensor electrode may be arranged, which is coupled
  • Such an operating and display device is known for example from the document DE 102 36 718 A1.
  • This operating device includes a control panel, which a one-piece plastic injection-molded component, which is made of ABS plastic.
  • the control panel has a circular transillumination region, in which the material thickness of the diaphragm material is reduced compared to the standard material thickness in such a way that the transillumination region is translucent.
  • This transillumination area forms an optical display device - display symbols or function symbols are mounted on the surface of the transillumination area and can be illuminated by means of a luminous element, such as a light-emitting diode.
  • the light-emitting element is mounted on a printed circuit board.
  • a sensor electrode is attached to a rear side of the control panel, which is part of a capacitive switch or component of a contact capacitor.
  • the sensor electrode is electrically connected via a coupling element or contact part to the printed circuit board and thus to an evaluation unit.
  • the coupling element can be designed to be elastic, for example as a metallic helical spring or as a compressible element of conductive, elastic plastic.
  • the circuit board is thus located at a distance from the control panel.
  • a disadvantage of this prior art is the fact that the coupling element causes a certain crosstalk between the sensor electrode and any other existing sensor electrodes or other capacitive switches. The actuation of one of the capacitive switches can thus cause an unwanted triggering of a function associated with another capacitive switch.
  • the capacitive operating device comprises a first transparent and a conductive layer, an insulating layer, and a second transparent and conductive layer which are attached to the back of a cover.
  • the board is arranged at a distance from the panel.
  • the OLED device is arranged, which may also consist of three different layers. A space between the panel and the board is sealed by means of the seal.
  • An operating and display device for a washing machine is also known from the publication GB 2 262 820 A. It is an object of the invention to provide a solution as a capacitive control and display device of the type mentioned above over the prior art can be improved.
  • the capacitive operating and display device also includes a luminous element - such as an LED - for emitting light to backlight the display symbol.
  • the display window serves in particular as a light guide, via which the display symbol is illuminated.
  • the capacitive operating and display device also includes a capacitive sensor electrode as part of a contact capacitor, which is arranged at a distance from the operating surface, so that when touching the operating surface, a capacitance of the contact capacitor is changed.
  • the sensor electrode is on a printed circuit board arranged, and between the control surface on the one hand and the sensor electrode on the other hand, a member is arranged, which is formed of a resilient or elastically deformable and electrically insulating material.
  • a coupling element is dispensed with, which in the prior art connects the printed circuit board to the sensor electrode.
  • the sensor electrode is mounted directly on the circuit board, and between the sensor electrode and the control surface is an elastic and electrically non-conductive element.
  • the circuit board is also particularly easy to manufacture, because no coupling elements must be attached.
  • the control and display device is also very compact and can be made very flat.
  • the elastically deformable and electrically insulating element that mechanical tolerances between the operating surface and the sensor electrode can be compensated so that there are no air gaps between the operating surface and the sensor electrode. Namely, such air gaps could adversely affect the sensitivity of the capacitive control device.
  • the operating and display device is also particularly cost-effective, and there is a high degree of flexibility in the formation of variants - different country variants can be designed without much effort by replacing the display symbol.
  • Another advantage is the increased sensitivity of the capacitive operating device, namely on the one hand due to a relatively small distance between the sensor electrode and the operating surface and on the other hand also due to the use of the dielectric element. Thus, a relatively large change in the capacitance of the contact capacitor and therefore also an increased sensitivity of the operating device can be achieved.
  • the capacitive control and display device thus represents a touch-sensitive display, in particular an LED display, in which a function of the household appliance triggered by touching the display symbol and the triggering of this function can be signaled by illuminating the display symbol.
  • the operation of the operating device is thus effected by touching the control surface or by tapping the display symbol without having to perform a mechanical movement of a control knob.
  • the touch of the control surface is detected by an evaluation unit in that the capacitance of the contact capacitor changes.
  • a household appliance is understood to be a device which is used for household management.
  • the household appliance is thus a device which is designed for the treatment of household objects, such as items of laundry and / or dishes and / or food and the like. It may be a large household appliance, such as a washing machine, a tumble dryer, a dishwasher, a cooking appliance, an extractor hood, a refrigerator, a fridge-freezer or an air conditioner. But it can also be a small household appliance, such as a coffee machine or a food processor.
  • the operating and display device preferably has a different or separate from the display window control panel.
  • the control panel may have a continuous recess or opening into which the display window is inserted.
  • the display window can be made of a different - about transparent - material than the control panel.
  • the material for the display window can be selected independently of the material of the control panel. For example, for the control panel a material with poorer dielectric properties than for the display window can be selected. Thus, costs can be saved because the control panel does not need to be made of an expensive material with good dielectric and lighting properties.
  • the elastic and electrically insulating element can form at least a region of the display window-for example also the entire display window.
  • the elastic and electrically insulating element may also be formed for guiding the light of the luminous element.
  • the display window and the elastic and electrically insulating element are a single or common component, on whose backside preferably the sensor electrode is mounted.
  • the elastic and electrically insulating element is a different element from the display window, which rests on the one hand on a remote from the control surface back of the display window and on the other hand on the sensor electrode.
  • the elastic and electrically insulating element bridges the distance between the sensor electrode on the one hand and the display window on the other hand.
  • the elastic member may be formed for guiding light. It proves to be advantageous if the elastic and electrically insulating element under pressure between the operating surface - in particular the display window - on the one hand and the sensor electrode on the other hand is arranged. In this way, it is possible to compensate for the mechanical installation tolerances and manufacturing tolerances between the components particularly reliable.
  • This has the advantage that no air gaps are present between the operating surface and the sensor electrode and thus the capacitive operating device is particularly sensitive. In other words, the change in capacitance when touching the operating surface is thus relatively high, so that the evaluation unit can detect this change in capacity without much effort. This prevents misdetection.
  • an area between the operating surface on the one hand and the sensor electrode on the other hand is free of air gaps, ie free of air chambers.
  • the elastic and non-electrically conductive element may for example be made entirely of silicone or else of material comprising a silicone. Such a specific material has the advantage that, on the one hand, the mechanical tolerances due to the elasticity of this material are reliably compensated can. On the other hand, silicone also has relatively good dielectric properties, which proves to be particularly advantageous with regard to the design of the contact capacitor and with regard to the sensitivity of the capacitive operating device.
  • the elastic and electrically insulating element may also be formed, at least in regions, from a transparent or a translucent material.
  • this element can also have the function of guiding the light emitted by the luminous element or serve as a light guide.
  • this has a dielectric constant which is greater than 2, in particular greater than 5, more preferably greater than 10. Namely, the following relationship holds true: the larger the dielectric constant of the element, the higher the sensitivity of the capacitive operating device.
  • the sensor electrode and the luminous element are attached to the common printed circuit board or board.
  • the operating and display device can be made very compact, and it eliminates electrical connection elements between the circuit board and the luminous element or the sensor electrode.
  • the light-emitting element can be arranged on a rear side of the printed circuit board facing away from the display window. Then, the following embodiments are provided: On the one hand, a passage opening can be formed in the printed circuit board, through which the light of the luminous element is directed towards the display window and the display symbol. On the other hand, the circuit board itself may be at least partially transparent or translucent, so that the light of the luminous element is passed over the transparent or translucent area. On the one hand, more space for the sensor electrode and possibly also for further sensor electrodes thus remains on the other side of the printed circuit board. On the other hand, a visually appealing illumination of the control surface of the display window or of the display symbol is thus made possible without the lighting element itself being perceived by the operator.
  • the arrangement of the luminous element on the back of the circuit board also has the Advantage that between the circuit board on the one hand and the elastic element or the display window on the other hand, no air gap is formed or the circuit board can be brought into abutment with the back of the elastic element. Thus, an air gap between the display window and the sensor electrode is prevented.
  • the luminous element can also be arranged on a display window facing the front of the circuit board.
  • a household appliance according to the invention comprises a capacitive operating and display device according to the invention, the preferred embodiments presented with reference to the operating and display device according to the invention and their advantages correspondingly applying to the household appliance according to the invention. Further features of the invention will become apparent from the claims, the figure and the description of the figures. All the features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figure can be used not only in the respectively indicated combination but also in other combinations or alone.
  • An operating and display device 1 of a household appliance shown in the figure has essentially two different functions in the exemplary embodiment: on the one hand the function of a capacitive operating device and on the other hand also the function of an optical display device.
  • the household appliance may for example be a device for the care of laundry items - such as a washing machine or a tumble dryer - or a device for preparing food - such as an oven - or a dishwasher.
  • the operating and display device 1 is in principle a touch-sensitive LED display, which can be operated by touch and also serves as a display device.
  • the operating and display device 1 includes a display window 2, which is a transparent part, for example made of transparent plastic.
  • the display window 2 has a curved or bulbous base body 3, which has a convex and a concave side. From the convex side are a variety of webs 4 from.
  • the concave side of the main body 3 has a control surface
  • the writing film 6 is thus attached to the concave operating surface 5 of the display window 2.
  • the writing film 6 has various display symbols 7, which are each associated with a different function of the household appliance or respectively symbolize a different function.
  • the display symbols 7 may be characters and / or numbers and / or symbols and / or combination symbols, such as word-image characters.
  • the print film 6 is, for example, a light mask in which the display symbols 7 are formed.
  • the writing film 6 may have a thickness of a few micrometers.
  • the control and display device 1 also includes a printed circuit board or board 8, which is connected to the display window 2. On the circuit board 8, a plurality of sensor electrodes 9 are attached. In the exemplary embodiment, each display symbol 7 is assigned a respective sensor electrode 9. Each sensor electrode 9 is in itself a part of a contact capacitor whose second capacitor plate is formed by the finger of the operator. The operator can use the typeface
  • the display symbols 7 can therefore be tapped directly.
  • the operator therefore touches the writing film 6 at the level of the respective sensor electrodes 9 or in the respective overlapping area with the sensor electrodes 9, wherein the display symbols 7 can be touched independently of one another.
  • the display symbols 7 are therefore arranged in overlap or in overlap with the respective sensor electrodes 9.
  • a plurality of lighting elements 1 1 are arranged, in each case a lighting element 1 1 behind each sensor electrode 9.
  • a plurality of lighting elements can be arranged behind a sensor electrode to ensure uniform illumination of larger icons or text messages.
  • LEDs - the respective display symbols 7 are backlit, namely after triggering the associated function.
  • passage openings can be provided in the printed circuit board 8 and in the sensor electrodes 9, through which the light is conducted.
  • webs 4 By protruding from the convex side of the main body 3 of the display window 2 webs 4 spaces are separated from each other, which are each formed between the display symbols 7 and the associated sensor electrodes 9.
  • the webs 4 ensure that the display symbols 7 can be illuminated independently of each other. This means that the spaces between the webs 4 are optically decoupled from each other, so that the light from one of the spaces can not get into the adjacent space.
  • an element 12 is arranged, which is provided from an elastically deformable and dielectric or electrically insulating material. With the element 12, all intermediate spaces between the webs 4 or between the display window 2 and the sensor electrodes 9 are completely filled.
  • the element 12 (shaded area between the display window 2 and the printed circuit board 8) may be formed in one piece and extend over the entire length of the printed circuit board 8. Alternatively, a separate element 12 can be used for each space between the webs 4.
  • the element 12 may be arranged between the display window 2 and the circuit board 8 under compressive stress, namely such that between the display window 2 on the one hand and the sensor electrodes 9 on the other hand, no air gaps or air chambers are formed. Thus, the spaces between the webs 4 are formed free of air chambers. Because the element 12 is an elastic component, an air gap-free design of the intermediate spaces can be achieved even with coarse mechanical tolerances.
  • the element 12 is formed for example of silicone.
  • the elastic and non-electrically conductive element 12 thus rests on the one hand on the sensor electrodes 9 and the printed circuit board 8 and on the other hand on the base body 3 of the transparent display window 2.
  • the light-emitting elements 1 1 on the back 10 of the circuit board 8 can also be arranged at a relatively small distance from each other (the third and fourth light-emitting element 1 1 from the right). In this way, a seven-segment display can be created, with which arbitrary digits can be displayed.
  • the sensor electrodes 9 on the one hand and the opposite display symbols 7 or the control surface 5 on the other hand form a capacitive switch in pairs. The capacitive switches can be operated separately from each other, namely by tapping the respective display symbols 7.
  • the capacitance of a contact capacitor which changes through the third sensor electrode 9 from the left on the one hand and through the above this sensor electrode 9 lying fingers of the operator on the other hand is formed. This is detected by the evaluation unit, and the third lighting element 1 1 from the left can be activated.
  • the third display symbol 7 is illuminated.

Abstract

L'invention concerne un dispositif de commande et d'affichage capacitif (1) pour un appareil électroménager, qui comprend une fenêtre d'affichage (2) dotée d'une surface de commande tactile (5), un symbole d'affichage (7) étant fixé sur ladite fenêtre d'affichage (2), un élément lumineux (11) qui émet de la lumière destinée à éclairer le symbole d'affichage (7), et une électrode de détection capacitive (9) formant une partie d'un condensateur de contact tactile, installée à une certaine distance de la surface de commande tactile (5), la capacité du condensateur de contact tactile étant modifiable en réponse à un contact tactile de la surface de commande (5). L'électrode de détection (9) est monté sur une carte à circuit imprimé (8), et un élément (12) formé d'un matériau élastique et électriquement isolant est disposé entre le surface de commande (5) et l'électrode de détection (9).
PCT/EP2012/060706 2011-06-21 2012-06-06 Dispositif de commande et d'affichage capacitif pour appareil électroménager et appareil électroménager comprenant un tel dispositif de commande et d'affichage WO2012175336A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112012002569.5T DE112012002569A5 (de) 2011-06-21 2012-06-06 Kapazitive Bedien- und Anzeigeeinrichtung für ein Haushaltsgerät und Haushaltsgerätmit einer solchen Bedien- und Anzeigeeinrichtung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011077902.7 2011-06-21
DE102011077902A DE102011077902A1 (de) 2011-06-21 2011-06-21 Kapazitive Bedien- und Anzeigeeinrichtung für ein Haushaltsgerät und Haushaltsgerät mit einer solchen Bedien- und Anzeigeeinrichtung

Publications (2)

Publication Number Publication Date
WO2012175336A2 true WO2012175336A2 (fr) 2012-12-27
WO2012175336A3 WO2012175336A3 (fr) 2013-02-21

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Application Number Title Priority Date Filing Date
PCT/EP2012/060706 WO2012175336A2 (fr) 2011-06-21 2012-06-06 Dispositif de commande et d'affichage capacitif pour appareil électroménager et appareil électroménager comprenant un tel dispositif de commande et d'affichage

Country Status (2)

Country Link
DE (2) DE102011077902A1 (fr)
WO (1) WO2012175336A2 (fr)

Families Citing this family (11)

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DE202013100760U1 (de) 2013-02-20 2014-05-22 Eugster/Frismag Ag Kaffeemaschine
DE102013214164A1 (de) * 2013-07-18 2015-02-19 E.G.O. Elektro-Gerätebau GmbH Bedienteil für eine Bedieneinrichtung und Bedieneinrichtung
WO2015019126A1 (fr) * 2013-08-05 2015-02-12 Diehl Ako Stiftung & Co. Kg. Écran tactile capacitif imprimé disposé sur un substrat moulé et ayant des leds à montage inversé non affleurantes
DE102015216629A1 (de) 2015-08-31 2017-03-02 BSH Hausgeräte GmbH Haushaltsgerät mit einer als externer oder interner Touchscreen ausgestalteten Bedieneinrichtung
DE102015216628A1 (de) 2015-08-31 2017-03-02 BSH Hausgeräte GmbH Haushaltsgerät mit einer verbesserten Bedienbarkeit einer als Touchscreen ausgestalteten Bedieneinrichtung
DE102016211327A1 (de) 2016-06-24 2017-12-28 BSH Hausgeräte GmbH Haushaltsgerät mit verbessertem Drehwähler und Verfahren zum Betrieb des Haushaltsgerätes
DE102016214642B4 (de) 2016-08-08 2024-02-29 BSH Hausgeräte GmbH Haushaltsgerät mit Touchdrehwähler, Verfahren zu seiner Herstellung und Verfahren zu seinem Betrieb
EP3596827B1 (fr) * 2017-03-13 2022-05-11 Captron Electronic GmbH Commutateur de capteur capacitif à affichage
DE102017204771A1 (de) 2017-03-22 2018-09-27 BSH Hausgeräte GmbH Haushaltsgerät mit gegen elektromagnetische Störungen abgeschirmtem kapazitivem Touchscreen und Verfahren zu seiner Herstellung
DE102017113662A1 (de) * 2017-06-21 2018-12-27 Trw Automotive Electronics & Components Gmbh Kraftfahrzeugbedienvorrichtung sowie Verfahren zum Herstellen einer Kraftfahrzeugbedienvorrichtung
CN108092657B (zh) * 2018-01-04 2021-09-03 无锡市瀚为科技有限公司 一种触摸电极结构化的电容式触摸开关及其触发方法

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GB2262820A (en) 1991-12-25 1993-06-30 Toshiba Kk Operation panel with a display unit for use in washing machines
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DE2824973A1 (de) 1978-06-07 1979-12-20 Euro Hausgeraete Gmbh Verfahren und vorrichtung zur steuerung der programmwahl bei elektrischen haushaltgeraeten
GB2262820A (en) 1991-12-25 1993-06-30 Toshiba Kk Operation panel with a display unit for use in washing machines
DE10236718A1 (de) 2002-08-06 2004-02-12 E.G.O. Control Systems Gmbh & Co. Kg Elektrohaushaltsgerät mit Anzeigeeinrichtung
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Also Published As

Publication number Publication date
DE102011077902A1 (de) 2012-12-27
DE112012002569A5 (de) 2014-03-27
WO2012175336A3 (fr) 2013-02-21

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