Keyboard appliance for touchscreen
First Claim
1. A keyboard that activates registration of a user input by a touchscreen, which underlies the keyboard, in response to a user applying a pressing force of a pressure source into contact with the keyboard, wherein the keyboard responds to said pressing force by forming a discharge path for an area of the touchscreen corresponding to a pressed key of the keyboard, the touchscreen being a capacitive discharge touchscreen of a type that registers user input in response to touch by discharging from a touched area of the touchscreen, the touchscreen discharging said area corresponding to said pressed key into said keyboard along the formed discharge path, the keyboard comprising:
- a plurality of keys by which the pressure source applies physical contact with the keyboard;
a corresponding plurality of non-conductive areas configured to electrically isolate the touchscreen from the pressure source at a location of said physical contact between the pressure source and the keyboard; and
a deformable diaphragm having a portion that is electrically conductive, said electrically conductive portion comprising either one of all or less than all of the diaphragm;
wherein a first key among said plurality of keys is configured to be activated in response to application of said pressing force to said first key; and
wherein in response to activation of said first key, said discharge path, which excludes said pressure source, is formed between said contacted touchscreen area corresponding to the activated first key and at least the diaphragm, the diaphragm being electrically isolated from said pressure source, which presses said activated first key, by at least said corresponding non-conductive area to exclude the pressure source from the discharge path by which the touchscreen registers said input in response to said activation of said first key.
1 Assignment
0 Petitions
Accused Products
Abstract
A keyboard activates areas of a touchscreen according to user interaction with the keyboard. A discharge circuit provides a discharge path for altering the electrostatic field of the touchscreen. Such discharge circuit excludes the user'"'"'s finger (or stylus). Instead of grounding to the user, a ground plane in varying embodiments may be contained within the keyboard, or be formed at least in part by by the case of the keyboard, the case of the host device, or the ground plane of the host device. The keyboard includes an electrical ground member to absorb the capacitive discharge and/or conduct such discharge to the ground plane.
26 Citations
38 Claims
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1. A keyboard that activates registration of a user input by a touchscreen, which underlies the keyboard, in response to a user applying a pressing force of a pressure source into contact with the keyboard, wherein the keyboard responds to said pressing force by forming a discharge path for an area of the touchscreen corresponding to a pressed key of the keyboard, the touchscreen being a capacitive discharge touchscreen of a type that registers user input in response to touch by discharging from a touched area of the touchscreen, the touchscreen discharging said area corresponding to said pressed key into said keyboard along the formed discharge path, the keyboard comprising:
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a plurality of keys by which the pressure source applies physical contact with the keyboard; a corresponding plurality of non-conductive areas configured to electrically isolate the touchscreen from the pressure source at a location of said physical contact between the pressure source and the keyboard; and a deformable diaphragm having a portion that is electrically conductive, said electrically conductive portion comprising either one of all or less than all of the diaphragm; wherein a first key among said plurality of keys is configured to be activated in response to application of said pressing force to said first key; and wherein in response to activation of said first key, said discharge path, which excludes said pressure source, is formed between said contacted touchscreen area corresponding to the activated first key and at least the diaphragm, the diaphragm being electrically isolated from said pressure source, which presses said activated first key, by at least said corresponding non-conductive area to exclude the pressure source from the discharge path by which the touchscreen registers said input in response to said activation of said first key. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method of activating an area of a touchscreen corresponding to a touchscreen key of a touchscreen key set, comprising:
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overlaying a keyboard apparatus onto an external surface of the touchscreen, whereby physical contact is made and maintained between the touchscreen and a plurality of contact surfaces of the keyboard apparatus at multiple touchscreen areas configured to receive touchscreen key inputs, the keyboard apparatus having a plurality of keys; receiving at a first key of the keyboard apparatus a pressing force of a pressure source contacting the first key, wherein said pressing force activates said first key; closing an electrical circuit path within the keyboard in response to activation of said first key, said closed electrical circuit path extending from a first contact surface among said plurality of contact surfaces corresponding to said first key to a capacitive ground structure, said first contact surface being in physical contact with a first touchscreen area among said multiple touchscreen areas corresponding to the first key, said capacitive ground structure comprising a conductive layer sandwiched between a first non-conductive layer and a second non-conductive layer, at least the conductive layer and the first non-conductive layer being part of the keyboard apparatus; and discharging said first touchscreen area corresponding to the first key when said electrical circuit path is closed, said discharging occurring through said electrical circuit path with discharge from said first touchscreen area being absorbed by said capacitive ground structure so that the touchscreen registers a touch input at said first touchscreen area; and wherein said touchscreen is electrically isolated from the pressure source at a location of physical contact between the pressure source and the first key by a non-conductive area corresponding to the first key so that the pressure source where contacting the first key does not form part of the electrical circuit path or capacitive ground structure during said receiving, closing and discharging. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38)
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Specification