IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0820900
(2010-06-22)
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등록번호 |
US-8217809
(2012-07-10)
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발명자
/ 주소 |
- Westhues, Jonathan
- Dietz, Paul
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출원인 / 주소 |
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대리인 / 주소 |
Alleman Hall McCoy Russell & Tuttle LLP
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인용정보 |
피인용 횟수 :
5 인용 특허 :
6 |
초록
▼
Embodiments are disclosed that relate to input devices. In one embodiment, an input device comprises a sensor matrix having first and second pluralities of conductors, a plurality of first resistors, a voltage-applying mechanism configured to apply a selected voltage to each second conductor of the
Embodiments are disclosed that relate to input devices. In one embodiment, an input device comprises a sensor matrix having first and second pluralities of conductors, a plurality of first resistors, a voltage-applying mechanism configured to apply a selected voltage to each second conductor of the plurality of second conductors, a plurality of sensors, a scanning sensing circuit, and a wake-up sensing circuit. Each first resistor is connected in series between a first voltage and a conductor of the plurality of first conductors. Each sensor includes a switch in series with a matrix resistor, and each sensor is connected to one of the plurality of first conductors and one of the plurality of second conductors. The scanning sensing circuit is connected to each of the plurality of first conductors, and the wake-up sensing circuit is connected to each of the plurality of second conductors.
대표청구항
▼
1. An input device comprising a sensor matrix, the sensor matrix comprising: a plurality of first conductors;a plurality of first resistors, each first resistor being connected in series between a first voltage and a first conductor corresponding to the first resistor;a plurality of second conductor
1. An input device comprising a sensor matrix, the sensor matrix comprising: a plurality of first conductors;a plurality of first resistors, each first resistor being connected in series between a first voltage and a first conductor corresponding to the first resistor;a plurality of second conductors;a voltage-applying mechanism configured to apply a selected voltage to each second conductor of the plurality of second conductors;a plurality of sensors, each sensor including a switch in series with a matrix resistor, each sensor connected to a first conductor corresponding to the sensor and a second conductor corresponding to the sensor;a scanning sensing circuit operatively connected to each first conductor of the plurality of first conductors;a wake-up sensing circuit operatively connected to each second conductor of the plurality of second conductors. 2. The input device of claim 1, wherein the voltage-applying mechanism comprises a plurality of second resistors, each second resistor being connected in series between a second voltage and a second conductor corresponding to the second resistor. 3. The input device of claim 2, wherein a resistance of each second resistor is lower than a resistance of each matrix resistor. 4. The input device of claim 2, wherein each switch is actuatable to form a voltage divider comprising one second resistor of the plurality of second resistors, the matrix resistor that is in series with the switch, and one first resistor of the plurality of first resistors, and wherein the wake-up sensing circuit is configured to detect a voltage of each conductor of the plurality of second conductors. 5. The input device of claim 1, wherein the wake-up sensing circuit is configured to detect a voltage of each conductor of the plurality of second conductors. 6. The input device of claim 1, wherein the voltage-applying mechanism comprises a controller configured to apply a voltage to each second conductor and also comprises a capacitor, and wherein the controller is configured to receive an input of one or more of a rising edge and a falling edge at each second conductor after applying the voltage to each second conductor. 7. A method for detecting an active sensor on an input device via a controller, the method comprising: applying a first voltage to each conductor of a plurality of first conductors;applying a second voltage to each conductor of a second plurality of conductors when the controller is in the sleep mode;entering the controller in a sleep mode;sensing a voltage of each conductor of the plurality of second conductors while in the sleep mode;receiving a user actuation of a switch in series with a matrix resistor, the switch and the matrix resistor connected in series between a first selected conductor from the plurality of first conductors and a second selected conductor from the plurality of second conductors;detecting via the controller an edge of the voltage of the second selected conductor from the plurality of second conductors; andentering the controller into a wake mode when the edge of the voltage of the second selected conductor from the plurality of second conductors is detected. 8. The method of claim 7, further comprising: upon operating the controller in the wake mode, scanning each conductor from the plurality of second conductors, wherein scanning includes applying the second voltage to a selected conductor from the plurality of second conductors and applying the first voltage to the non-selected conductors of the plurality of second conductors; andsensing a current of each conductor of the plurality of first conductors. 9. The method of claim 7, wherein applying the second voltage to each conductor of the plurality of second conductors includes pre-charging each conductor of the plurality of second conductors by applying the second voltage. 10. The method of claim 7, wherein the first voltage is applied to each conductor of the plurality of first conductors through a first resistor in series with the first voltage, the second voltage is applied to each conductor of the plurality of second conductors through a second resistor in series with the second voltage, and a resistance of the second resistor is greater than a resistance of the first resistor. 11. The method of claim 7, wherein the second voltage is applied to each conductor of the plurality of second conductors via an input/output pin of the controller prior to operating the controller in sleep mode, and further comprising, prior to operating in sleep mode, converting the pin of the controller from an output pin to an input pin after applying the second voltage to each conductor of the plurality of second conductors. 12. The method of claim 11, further comprising periodically waking the controller from sleep mode to refresh the charge on each conductor of the plurality of second conductors and then re-entering into sleep mode. 13. The method of claim 7, further comprising: supplying current to a scanning sensing circuit during the wake mode; anddisconnecting current to the scanning sensing circuit during the sleep mode. 14. A system for detecting a key pressed on a keyboard, comprising: a plurality of first conductors and a plurality of first resistors, each conductor of the plurality of first conductors connected by a corresponding resistor of the plurality of first resistors to a first voltage;a plurality of second conductors and a plurality of second resistors, each conductor of the plurality of second conductors connected by a corresponding resistor of the plurality of second resistors to a second voltage;a plurality of keys, each key including a switch in series with a matrix resistor, each key connected to a first conductor corresponding to the switch and a second conductor corresponding to the switch;a scanning sensing circuit including a plurality of inputs connected to the plurality of first conductors;a wake-up sensing circuit including a plurality of inputs connected to the plurality of second conductors;a controller operatively connected to the scanning sensing circuit and the wake-up sensing circuit; anda computer readable medium containing instructions encoded to execute on the controller, the instructions configured to:put the controller in a sleep mode;detect an edge of the voltage of each conductor of the plurality of second conductors;put the controller in a wake mode when the edge of the voltage of a conductor of the plurality of second conductors is detected; anddetect a selected key that is pressed. 15. The system of claim 14, wherein the plurality of second conductors are connected to input/output pins of the controller. 16. The system of claim 14, wherein a resistance of each resistor of the plurality of second resistors is greater than a resistance of each resistor of the plurality of first resistors. 17. The system of claim 14, wherein one or more resistors of the plurality of first resistors and the plurality of second resistors are integrated into one or more input/output pins of the controller. 18. The system of claim 14, wherein the wake-up sensing circuit is integrated into the controller. 19. The system of claim 14, wherein the scanning sensing circuit includes a plurality of comparators, each comparator including a first input connected to one first conductor of the plurality of first conductors and a second input connected to a reference voltage. 20. The system of claim 14, wherein power for the scanning sensing circuit is controlled by an output pin of the controller and the computer readable medium further includes instructions configured to power down the scanning sensing circuit when the system enters the sleep mode and to power up the scanning sensing circuit when the system enters the wake mode.
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