WO2011154378A1 - A household appliance comprising capacitive touch sensors - Google Patents
A household appliance comprising capacitive touch sensors Download PDFInfo
- Publication number
- WO2011154378A1 WO2011154378A1 PCT/EP2011/059336 EP2011059336W WO2011154378A1 WO 2011154378 A1 WO2011154378 A1 WO 2011154378A1 EP 2011059336 W EP2011059336 W EP 2011059336W WO 2011154378 A1 WO2011154378 A1 WO 2011154378A1
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- WIPO (PCT)
- Prior art keywords
- household appliance
- touch sensors
- grounding
- sensing device
- control unit
- Prior art date
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- 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
Definitions
- the present invention relates to a household appliance comprising capacitive touch sensors that operate by sensing the touch of the user.
- Household appliances with touch sensors are preferred because of their esthetic appearance and ease of cleaning.
- Various methods exist for the touch sensors to detect the contact of the user and capacitive sensing is the most widely used method due to ease of adjustment (calibration). Besides the advantages of the capacitive touch sensors, they also have some disadvantages.
- the touch sensors are easily affected by environmental conditions such as humidity and temperature.
- the signals received and sent by more than one side by side touch sensors cross-talk to each other and as a result of this when the finger is moved near one touch sensor the other touch sensors are also affected.
- the most widely used method for minimizing the cross-talk effect is to ground the regions remaining between the touch sensors by means of grounding lines thus maintaining isolation of the touch sensors.
- the inducted load amount in other words the precision of the touch sensor decreases.
- the reason for this is that some amount of the load inducted from the finger of the user is drawn from the touch key region by the grounding line and transferred to the ground. Isolating the regions between the touch keys by grounding lines, although useful under conditions of high temperature and humidity that increase cross-talk and impair detection, results in the decrease of key precision in normal environmental conditions wherein the temperature and humidity are not high. For example, when the vitroceramic cookers are operated after a long waiting time period, the humidity accumulated in the cooker condenses in the touch sensor region. Since this condition affects operation of the touch sensors, the touch sensors are isolated however this time their precision decreases.
- the aim of the present invention is the realization of a household appliance comprising touch sensors and wherein cross-talk is prevented without decreasing precision of the touch sensors.
- the household appliance realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises capacitive touch sensors disposed in the control panel, a grounding shield extending to the regions remaining between the touch sensors and decreasing the cross talk problem by isolating the touch sensors, a switch connected to the grounding line and one or more condition sensing device disposed near the touch sensors, preferably between the control panel and the touch sensors and detecting the temperature and/or humidity values in the environment, and the control unit activates or deactivates the grounding shield by turning on or off the switch according to the data received from the condition sensing device.
- the condition sensing device is a humidity sensor or a temperature sensor or a temperature/humidity dual sensor used as a single unit.
- the grounding shield is activated providing to perform the grounding function, the touch sensors are isolated and cross-talk of the signals is prevented.
- the grounding shield is prevented from performing the grounding function by being changed to the passive or floating position, the touch sensors are provided to operate with high precision since the electric field generated at the touch sensors is not transferred to the ground.
- the grounding shield extends not only between the touch sensors but also between the conductive lines that deliver the signals received from the touch sensors to the control unit and decreases the cross-talk between the conductive lines.
- the grounding shield extending between the touch sensors and the conductive lines are activated only when the humidity and temperature is high and are not activated in normal environmental conditions when the humidity and temperature is not high, thus the touch sensors are provided to operate with high precision in normal environmental conditions.
- Figure 1 - is the schematic view of a household appliance comprising the touch sensors.
- Figure 2 – is the schematic view of a household appliance in another embodiment of the present invention.
- the household appliance (1) comprises a control panel (2), more than one capacitive type touch sensor (3) integrated to the control panel (2), providing application of functions like opening, closing or other auxiliary functions by sensing the touch of the user’s finger, a control unit (6) disposed at the underside of the control panel (2), regulating operation of the touch sensors (3), having a drive circuit (4) that produces voltage signals so as to generate a constant electric field in the touch sensors (3) and a sense circuit (5) that evaluates the signals received from the touch sensors (3), more than one conductive line (7) providing the connections between the drive circuit (4) and the sense circuit (5) with the touch sensors (3), a grounding shield (8), extending to regions remaining between the touch sensors (3), surrounding the touch sensors (3) and decreasing the cross-talk problem by isolating the touch sensors (3), a grounding line (9) providing the connection between the grounding shield (8) and the ground (G), for example the base unit of the household appliance (1).
- a control panel (2) more than one capacitive type touch sensor (3) integrated to the control panel (2), providing application
- the household appliance (1) of the present invention comprises
- condition sensing device 10 disposed near the control unit (6) and the touch sensors (3) and detecting the temperature and/or moisture conditions in the ambient environment
- control unit (6) that changes the grounding shield (8) to active (grounding) or passive (un-grounding) position by opening/closing the switch (11) according to data received from the condition sensing device (10) ( Figure 1, Figure 2).
- the control unit (6) provides the connection between the grounding shield (8) and the ground (G) by closing the switch (11) on the grounding line (9) if the temperature and/or moisture values measured by the condition sensing device (10) are above the predetermined threshold temperature and/or moisture values recorded in the memory thereof, thus activates the grounding shield (8) in high temperature and/or moisture value, the touch sensors (3) are isolated from each other and the cross-talk problem due to high amount of temperature and/or moisture is prevented.
- the control unit (6) cuts off the connection between the grounding shield (8) and the ground (G) by opening the switch (11) on the grounding line (9) if the temperature and/or humidity values measured by the condition sensing device (10) are below the predetermined threshold temperature and/or humidity values recorded in the memory thereof, thus deactivates the grounding shield (8).
- the grounding shield (8) changed to the passive position by being disconnected from the ground (G), does not perform the grounding function, the electrical field generated in the touch sensors (3) is not transferred to the ground and the precision of the touch sensors (3) increases.
- condition sensing device (10) is a humidity sensor.
- condition sensing device (10) is a temperature sensor.
- condition sensing device (10) is a temperature/humidity dual sensor used as a single unit and detects both the temperature and humidity values of the ambient environment.
- condition sensing device (10) is disposed between the control unit (6) and the touch sensors (3).
- the control unit (6) actuates the switch (11) by evaluating data received from the condition sensing device (10) and changes the grounding shield (8) to the active or passive position.
- the grounding shield (8) is changed to the active position by closing the switch (11)
- excess of the electric field generated in the touch sensors (3) by means of the drive circuit (4) is transferred to the ground (G)
- the touch sensors (3) are changed to the state of being isolated from each other.
- the touch sensors (3) can be calibrated in this state and provide the precision anticipated by the user when grounding is made.
- the grounding shield (8) is changed to the passive position by the control unit (6) by opening the switch (11), excess of the electric field generated in the touch sensors (3) by means of the drive circuit (4) is not transferred to the ground (G).
- the precision of the touch sensors (3) increase and if desired the degree of precision can be adjusted.
- the control unit (6) will change the grounding shield (8) to the active position and when to the passive position is automatically determined according to data received from the condition sensing device (10).
- the grounding shield (8) extends not only to regions remaining between the touch sensors (3) but also to regions remaining between the conductive lines (7) and the grounding shield (8), when changed to the active position by the control unit (6), decreases the problem of cross-talk between the conductive lines (7) by isolating the conductive lines (7) ( Figure 2).
- the household appliance (1) is a cooker.
- the household appliance (1) is an oven.
- the household appliance (1) is a washing machine.
- the household appliance (1) is a dishwasher.
- the household appliance (1) is a laundry dryer.
- the household appliance (1) is a refrigerator.
- the grounding shield (8) is used for preventing the cross-talk problem between the touch sensors (3) and the conductive lines (7), and by means of a switch (11) triggered by the control unit (6) the grounding operation is made only when the temperature and/or humidity values detected by the condition sensing device (10) are above the predetermined threshold values and loss of precision in the touch sensors (3) is prevented.
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- Switches That Are Operated By Magnetic Or Electric Fields (AREA)
Abstract
The present invention relates to a household appliance (1) comprising a control panel (2), more than one capacitive type touch sensor (3) integrated to the control panel (2), providing application of functions like opening, closing or other auxiliary functions by sensing the touch of the user, a control unit (6) disposed at the underside of the control panel (2), having a drive circuit (4) that produces voltage signals so as to generate a constant electrical field in the touch sensors (3) and a sense circuit (5) that evaluates the signals received from the touch sensors (3), more than one conductive line (7) providing the connection between the drive circuit (4) and the sense circuit (5) with the touch sensors (3), a grounding shield (8), extending to regions remaining between the touch sensors (3), that decreases the cross-talk problem by isolating the touch sensors (3) and a grounding line (9) providing the connection between the grounding shield (8) and the ground (G).
Description
The present invention relates to a household appliance comprising capacitive touch sensors that operate by sensing the touch of the user.
Household appliances with touch sensors (touch keys) are preferred because of their esthetic appearance and ease of cleaning. Various methods exist for the touch sensors to detect the contact of the user and capacitive sensing is the most widely used method due to ease of adjustment (calibration). Besides the advantages of the capacitive touch sensors, they also have some disadvantages. The touch sensors are easily affected by environmental conditions such as humidity and temperature. The signals received and sent by more than one side by side touch sensors cross-talk to each other and as a result of this when the finger is moved near one touch sensor the other touch sensors are also affected. The most widely used method for minimizing the cross-talk effect is to ground the regions remaining between the touch sensors by means of grounding lines thus maintaining isolation of the touch sensors. In this case, when the user moves his/her finger near the touch key, the inducted load amount, in other words the precision of the touch sensor decreases. The reason for this is that some amount of the load inducted from the finger of the user is drawn from the touch key region by the grounding line and transferred to the ground. Isolating the regions between the touch keys by grounding lines, although useful under conditions of high temperature and humidity that increase cross-talk and impair detection, results in the decrease of key precision in normal environmental conditions wherein the temperature and humidity are not high. For example, when the vitroceramic cookers are operated after a long waiting time period, the humidity accumulated in the cooker condenses in the touch sensor region. Since this condition affects operation of the touch sensors, the touch sensors are isolated however this time their precision decreases.
In the state of the art Great Britain Patent No. GB2435998, the structure of a capacitive touch sensor is explained.
In the International Patent Application No. WO2009132150, a touch sensor panel is explained the touch event detection capabilities of which are improved by using the ground isolation bars.
The aim of the present invention is the realization of a household appliance comprising touch sensors and wherein cross-talk is prevented without decreasing precision of the touch sensors.
The household appliance realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises capacitive touch sensors disposed in the control panel, a grounding shield extending to the regions remaining between the touch sensors and decreasing the cross talk problem by isolating the touch sensors, a switch connected to the grounding line and one or more condition sensing device disposed near the touch sensors, preferably between the control panel and the touch sensors and detecting the temperature and/or humidity values in the environment, and the control unit activates or deactivates the grounding shield by turning on or off the switch according to the data received from the condition sensing device.
The condition sensing device is a humidity sensor or a temperature sensor or a temperature/humidity dual sensor used as a single unit.
If the humidity and/or temperature data received from the condition sensing device is above the predetermined threshold values, the grounding shield is activated providing to perform the grounding function, the touch sensors are isolated and cross-talk of the signals is prevented.
If the humidity and/or temperature data received from the condition sensing device is below the predetermined threshold values, the grounding shield is prevented from performing the grounding function by being changed to the passive or floating position, the touch sensors are provided to operate with high precision since the electric field generated at the touch sensors is not transferred to the ground.
In another embodiment of the present invention, the grounding shield extends not only between the touch sensors but also between the conductive lines that deliver the signals received from the touch sensors to the control unit and decreases the cross-talk between the conductive lines.
In the household appliance of the present invention, the grounding shield extending between the touch sensors and the conductive lines are activated only when the humidity and temperature is high and are not activated in normal environmental conditions when the humidity and temperature is not high, thus the touch sensors are provided to operate with high precision in normal environmental conditions.
The household appliance realized in order to attain the aim of the present invention is illustrated in the attached figures, where:
Figure 1 - is the schematic view of a household appliance comprising the touch sensors.
Figure 2 – is the schematic view of a household appliance in another embodiment of the present invention.
The elements illustrated in the figures are numbered as follows:
- Household appliance
- Control panel
- Touch sensor
- Drive circuit
- Sense circuit
- Control unit
- Conductive line
- Grounding shield
- Grounding line
- Condition sensing device
- Switch
The household appliance (1) comprises a control panel (2), more than one capacitive type touch sensor (3) integrated to the control panel (2), providing application of functions like opening, closing or other auxiliary functions by sensing the touch of the user’s finger, a control unit (6) disposed at the underside of the control panel (2), regulating operation of the touch sensors (3), having a drive circuit (4) that produces voltage signals so as to generate a constant electric field in the touch sensors (3) and a sense circuit (5) that evaluates the signals received from the touch sensors (3), more than one conductive line (7) providing the connections between the drive circuit (4) and the sense circuit (5) with the touch sensors (3), a grounding shield (8), extending to regions remaining between the touch sensors (3), surrounding the touch sensors (3) and decreasing the cross-talk problem by isolating the touch sensors (3), a grounding line (9) providing the connection between the grounding shield (8) and the ground (G), for example the base unit of the household appliance (1).
The household appliance (1) of the present invention comprises
- one or more than one condition sensing device (10) disposed near the control unit (6) and the touch sensors (3) and detecting the temperature and/or moisture conditions in the ambient environment,
- a switch (11) connected onto the grounding line (9) and
-the control unit (6) that changes the grounding shield (8) to active (grounding) or passive (un-grounding) position by opening/closing the switch (11) according to data received from the condition sensing device (10) (Figure 1, Figure 2).
The control unit (6) provides the connection between the grounding shield (8) and the ground (G) by closing the switch (11) on the grounding line (9) if the temperature and/or moisture values measured by the condition sensing device (10) are above the predetermined threshold temperature and/or moisture values recorded in the memory thereof, thus activates the grounding shield (8) in high temperature and/or moisture value, the touch sensors (3) are isolated from each other and the cross-talk problem due to high amount of temperature and/or moisture is prevented.
The control unit (6) cuts off the connection between the grounding shield (8) and the ground (G) by opening the switch (11) on the grounding line (9) if the temperature and/or humidity values measured by the condition sensing device (10) are below the predetermined threshold temperature and/or humidity values recorded in the memory thereof, thus deactivates the grounding shield (8). The grounding shield (8), changed to the passive position by being disconnected from the ground (G), does not perform the grounding function, the electrical field generated in the touch sensors (3) is not transferred to the ground and the precision of the touch sensors (3) increases.
In an embodiment of the present invention, the condition sensing device (10) is a humidity sensor.
In another embodiment of the present invention, the condition sensing device (10) is a temperature sensor.
In another embodiment of the present invention, the condition sensing device (10) is a temperature/humidity dual sensor used as a single unit and detects both the temperature and humidity values of the ambient environment.
In an embodiment of the present invention, the condition sensing device (10) is disposed between the control unit (6) and the touch sensors (3).
The control unit (6) actuates the switch (11) by evaluating data received from the condition sensing device (10) and changes the grounding shield (8) to the active or passive position. When the grounding shield (8) is changed to the active position by closing the switch (11), excess of the electric field generated in the touch sensors (3) by means of the drive circuit (4), is transferred to the ground (G), the touch sensors (3) are changed to the state of being isolated from each other. The touch sensors (3) can be calibrated in this state and provide the precision anticipated by the user when grounding is made. When the grounding shield (8) is changed to the passive position by the control unit (6) by opening the switch (11), excess of the electric field generated in the touch sensors (3) by means of the drive circuit (4) is not transferred to the ground (G). In this state, the precision of the touch sensors (3) increase and if desired the degree of precision can be adjusted. In the embodiment of the present invention, when the control unit (6) will change the grounding shield (8) to the active position and when to the passive position is automatically determined according to data received from the condition sensing device (10).
In another embodiment of the present invention, the grounding shield (8) extends not only to regions remaining between the touch sensors (3) but also to regions remaining between the conductive lines (7) and the grounding shield (8), when changed to the active position by the control unit (6), decreases the problem of cross-talk between the conductive lines (7) by isolating the conductive lines (7) (Figure 2).
In another embodiment of the present invention, the household appliance (1) is a cooker.
In another embodiment of the present invention, the household appliance (1) is an oven.
In another embodiment of the present invention, the household appliance (1) is a washing machine.
In another embodiment of the present invention, the household appliance (1) is a dishwasher.
In another embodiment of the present invention, the household appliance (1) is a laundry dryer.
In another embodiment of the present invention, the household appliance (1) is a refrigerator.
In the household appliance (1) of the present invention, the grounding shield (8) is used for preventing the cross-talk problem between the touch sensors (3) and the conductive lines (7), and by means of a switch (11) triggered by the control unit (6) the grounding operation is made only when the temperature and/or humidity values detected by the condition sensing device (10) are above the predetermined threshold values and loss of precision in the touch sensors (3) is prevented.
It is to be understood that the present invention is not limited by the embodiments disclosed above and a person skilled in the art can easily introduce different embodiments. These should be considered within the scope of the protection postulated by the claims of the present invention.
Claims (14)
- A household appliance (1) comprising a control panel (2), more than one capacitive type touch sensor (3) integrated to the control panel (2), providing application of functions like opening, closing and other auxiliary functions by sensing the touch of the user, a control unit (6) disposed at the underside of the control panel (2), having a drive circuit (4) that produces voltage signals so as to generate a constant electrical field in the touch sensors (3) and a sense circuit (5) that evaluates the signals received from the touch sensors (3), more than one conductive line (7) providing the connection between the drive circuit (4) and the sense circuit (5) with the touch sensors (3), a grounding shield (8), extending to regions remaining between the touch sensors (3), surrounding the touch sensors (3) and decreasing the cross-talk problem by isolating the touch sensors (3) and a grounding line (9) providing the connection between the grounding shield (8) and the ground (G), characterized by - one or more condition sensing device (10) disposed near the control unit (6) and the touch sensors (3) and that detects the temperature and/or humidity conditions in the ambient environment, - a switch (11) connected onto the grounding line (9) and - the control unit (6) that changes the grounding shield (8) to active (grounding) or passive (un-grounding) position by opening/closing the switch (11) according to data received from the condition sensing device (10).
- A household appliance (1) as in Claim 1, characterized by the condition sensing device (10) which is a humidity sensor.
- A household appliance (1) as in Claim 1, characterized by the condition sensing device (10) which is a temperature sensor.
- A household appliance (1) as in Claim 1, characterized by the condition sensing device (10) which is a temperature/humidity dual sensor used as a single unit that detects both the temperature and humidity values of the ambient environment.
- A household appliance (1) as in any one of the above Claims, characterized by the condition sensing device (10) that is disposed between the control unit (6) and the touch sensors (3).
- A household appliance (1) as in any one of the above Claims, characterized by the control unit (6) that provides the connection between the grounding shield (8) and the ground (G) by closing the switch (11) on the grounding line (9) thus activating the grounding shield (8) if the temperature and/or humidity values measured by the condition sensing device (10) are above the predetermined threshold temperature and/or humidity values recorded in the memory thereof.
- A household appliance (1) as in any one of the above Claims, characterized by the control unit (6) that cuts off the connection between the grounding shield (8) and the ground (G) by opening the switch (11) on the grounding line (9) thus deactivating the grounding shield (8) if the temperature and/or humidity values measured by the condition sensing device (10) are below the predetermined threshold temperature and/or humidity values recorded in the memory thereof.
- A household appliance (1) as in any one of the above Claims, characterized by the grounding shield (8) that extends to regions remaining between the conductive lines (7) and decreases the cross-talk problem between the conductive lines (7) by isolating the conductive lines (7) when changed to the active position by the control unit (6) and the switch (11).
- A household appliance (1) as in one of the above claims characterized by being a cooker.
- A household appliance (1) as in one of the above claims characterized by being an oven.
- A household appliance (1) as in one of the Claims 1 to 8, characterized by being a washing machine.
- A household appliance (1) as in one of the Claims 1 to 8 or in Claim 11, characterized by being a laundry dryer.
- A household appliance (1) as in one of the Claims 1 to 8, characterized by being a dishwasher.
- A household appliance (1) as in one of the Claims 1 to 8, characterized by being a refrigerator.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TRA2010/04570 | 2010-06-07 | ||
| TR201004570 | 2010-06-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2011154378A1 true WO2011154378A1 (en) | 2011-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2011/059336 WO2011154378A1 (en) | 2010-06-07 | 2011-06-07 | A household appliance comprising capacitive touch sensors |
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| Country | Link |
|---|---|
| WO (1) | WO2011154378A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014154275A1 (en) | 2013-03-28 | 2014-10-02 | Arcelik Anonim Sirketi | Capacitive touch sensors interface implementation |
| WO2024023591A1 (en) * | 2022-07-26 | 2024-02-01 | Centitvc - Centro De Nanotecnologia E Materiais Técnicos Funcionais E Inteligentes | Natural stone panel with an integrated touch sensing system and manufacturing method thereof |
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|---|---|---|---|---|
| EP1253717A2 (en) * | 2001-04-28 | 2002-10-30 | RAWE ELECTRONIC GmbH | Capacitive keyboard with evaluation circuit |
| GB2435998A (en) | 2005-09-20 | 2007-09-12 | Harald Philipp | Capacitive touch sensor for preventing walk by interference |
| US20090177429A1 (en) * | 2008-01-08 | 2009-07-09 | Mitsubishi Electric Corporation | Digital controller |
| WO2009132150A1 (en) | 2008-04-25 | 2009-10-29 | Apple Inc. | Ground guard for capacitive sensing |
| EP2187241A1 (en) * | 2007-10-04 | 2010-05-19 | Fujikura Ltd. | Capacitive proximity sensor and proximity detection method |
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2011
- 2011-06-07 WO PCT/EP2011/059336 patent/WO2011154378A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1253717A2 (en) * | 2001-04-28 | 2002-10-30 | RAWE ELECTRONIC GmbH | Capacitive keyboard with evaluation circuit |
| GB2435998A (en) | 2005-09-20 | 2007-09-12 | Harald Philipp | Capacitive touch sensor for preventing walk by interference |
| EP2187241A1 (en) * | 2007-10-04 | 2010-05-19 | Fujikura Ltd. | Capacitive proximity sensor and proximity detection method |
| US20090177429A1 (en) * | 2008-01-08 | 2009-07-09 | Mitsubishi Electric Corporation | Digital controller |
| WO2009132150A1 (en) | 2008-04-25 | 2009-10-29 | Apple Inc. | Ground guard for capacitive sensing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014154275A1 (en) | 2013-03-28 | 2014-10-02 | Arcelik Anonim Sirketi | Capacitive touch sensors interface implementation |
| WO2024023591A1 (en) * | 2022-07-26 | 2024-02-01 | Centitvc - Centro De Nanotecnologia E Materiais Técnicos Funcionais E Inteligentes | Natural stone panel with an integrated touch sensing system and manufacturing method thereof |
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