# Patent

## Title
Input device configuration having capacitive and pressure sensors

## Abstract

Input device configurations are described. In one or more implementations, an input device includes a sensor substrate having one or more conductors and a flexible contact layer spaced apart from the sensor substrate. The flexible contact layer is configured to flex to contact the sensor substrate to initiate an input of a computing device. The flexible contact layer includes a force concentrator pad that is configured to cause pressure to be channeled through the force concentrator pad to cause the flexible contact layer to contact the sensor substrate to initiate the input. In one or more implementations, an input device includes a capacitive sensor assembly arranged in an array that is configured to detect a location of an object that is proximal to a respective capacitive sensor of the capacitive sensor assembly and a pressure sensitive sensor assembly including a plurality of pressure sensitive sensor nodes that are configured to detect an amount of pressure applied by the object against a respective pressure sensitive sensor node of the pressure sensitive sensor assembly.

## Background
RELATED APPLICATIONS
This application claims priority as a continuation-in-part to U.S. patent application Ser. No. 13/974,749, filed Aug. 23, 2013 and titled “Input Device with Interchangeable Surface,” which claims priority as a continuation-in-part of U.S. patent application Ser. No. 13/655,065, filed Oct. 18, 2012, and titled “Media Processing Input Device,” which claims priority to U.S. Provisional Patent Application No. 61/659,364, filed Jun. 13, 2012, and titled “Music Blade,” the disclosures of each of which are hereby incorporated by reference in their entirety.


BACKGROUND
Mobile computing devices have been developed to increase the functionality that is made available to users in a mobile setting. For example, a user may interact with a mobile phone, tablet computer, or other mobile computing device to check email, surf the web, compose texts, interact with applications, and so on. Because mobile computing devices are configured to be mobile, however, the mobile devices may be ill suited for intensive data entry operations.
For example, some mobile computing devices provide a virtual keyboard that is accessible using touchscreen functionality of the device. However, it may difficult to perform some tasks using a virtual keyboard such as inputting a significant amount of text, composing a document, and so forth. Moreover, virtual keyboards consume some screen real estate that may otherwise be used to display content. Thus, use of traditional virtual keyboards may be frustrating when confronted with some input scenarios.
SUMMARY
Input device configurations are described. In one or more implementations, an input device includes a sensor substrate having one or more conductors and a flexible contact layer spaced apart from the sensor substrate. The flexible contact layer is configured to flex to contact the sensor substrate to initiate an input of a computing device. The flexible contact layer includes a force concentrator pad that is configured to cause pressure to be channeled through the force concentrator pad to cause the flexible contact layer to contact the sensor substrate to initiate the input.
In one or more implementations, an input device includes a plurality of indications that are selectable to initiate corresponding inputs and pressure sensitive sensor nodes formed in an array such that each of the indications corresponds to a plurality of the pressure-sensitive keys to initiate the corresponding inputs. The formation of the plurality of pressure sensitive sensor nodes includes a sensor substrate having one or more conductors and a flexible contact layer spaced apart from the sensor substrate that is configured to flex to contact the sensor substrate to initiate the corresponding input of a computing device.
In one or more implementations, an input device includes a sensor substrate having one or more conductors, a flexible contact layer spaced apart from the sensor substrate that is configured to flex to contact the sensor substrate to initiate an input of a computing device. The flexible contact layer includes a surface having a force sensitive ink configured to contact the one or more conductors of the sensor substrate to initiate the input and a plurality of spacers formed on the surface.
In one or more implementations, an input device includes a capacitive sensor assembly arranged in an array that is configured to detect a location of an object that is proximal to a respective capacitive sensor of the capacitive sensor assembly and a pressure sensitive sensor assembly including a plurality of pressure sensitive sensor nodes that are configured to detect an amount of pressure applied by the object against a respective pressure sensitive sensor node of the pressure sensitive sensor assembly.
In one or more implementations, an object is detected that is located proximal to one or more capacitive sensors of an input device. The input device is configured to communicate one or more inputs to a computing device. Responsive to the detection, functionality of the input device that is not related to the capacitive sensors is caused to be placed in an operational state.
In one or more implementations, an input device includes a capacitive sensor array configured to detect proximity of an object and a plurality of pressure sensitive sensor nodes embedded as nodes in the capacitive sensor array. The plurality of pressure sensitive sensor nodes are configured to initiate corresponding inputs of a computing device, each of the plurality of pressure sensitive sensor nodes formed from flexible contact layer spaced apart from a sensor substrate.
This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.



BRIEF DESCRIPTION OF THE DRAWINGS
The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The use of the same reference numbers in different instances in the description and the figures may indicate similar or identical items.
FIG. 1 is an illustration of an environment in an example implementation that is operable to employ the sensor configuration techniques described herein.
FIG. 2 depicts an example implementation of an input device of FIG. 1 as showing a flexible hinge in greater detail.
FIG. 3 depicts an example implementation showing a perspective view of a connection portion of FIG. 2 that includes mechanical coupling protrusions and a plurality of communication contacts.
FIG. 4 depicts an example implementation showing a cross section of the input device of FIG. 1.
FIG. 5 depicts an example implementation of a backlight mechanism of FIG. 1 as including a light guide of FIG. 4 and a light source.
FIG. 6 depicts an example implementation in which a layer of the sensor assembly is shown in a cross section, the layer configured to support implementation of pressure sensitive sensor nodes.
FIG. 7 depicts an example implementation in which a flexible contact layer of FIG. 6 is shown in cross section as combined with a sensor substrate to form a pressure sensitive sensor node assembly.
FIG. 8 depicts an example implementation of a pressure sensitive sensor node of FIGS. 6 and 7 as employing a force concentrator pad.
FIG. 9 an example of the pressure sensitive sensor node of FIG. 8 as having pressure applied at a plurality of different locations of the flexible contact layer to cause contact with the sensor substrate.
FIG. 10 depicts an example implementation in which a pressure sensitive sensor nodes are arranged in an array that is configured to support gesture detection and use for a plurality of different input configurations.
FIG. 11 depicts an implementation showing examples of indications of inputs of the outer layer of FIG. 4 as corresponding to a plurality of underlying pressure sensitive sensor nodes of an array of FIG. 10.
FIG. 12 depicts an example implementation of the input as including a pressure sensitive sensor assembly and a capacitive sensor assembly.
FIG. 13 depicts an example implementation in which pressure sensitive sensor nodes of a pressure sensitive sensor assembly are interspersed with capacitive sensors of a capacitive sensor assembly.
FIG. 14 depicts an example implementation in which the capacitive sensor assembly is configured as a layer and disposed proximal to a layer of a pressure sensitive sensor assembly.
FIG. 15 illustrates an example system generally at that includes an example computing device that is representative of one or more computing systems and/or devices that may implement the various techniques described herein.



DETAILED DESCRIPTION
Overview
Mobile computing devices may be utilized in a wide variety of different scenarios due to their mobile construction, e.g., configured to be held by one or more hands of a user. As previously described, however, conventional techniques that were utilized to interact with these mobile computing devices could be limited when restricted solely to a virtual keyboard. Although supplemental input devices have been developed (e.g., an external keyboard), these devices could be unwieldy and difficult to interact with in mobile scenarios, including limitations in inputs that are recognized by the input device, difficulty in transporting the devices, and so forth.
Input device configurations are described. In one or more implementations, an input device is configured to include a generally uniform array of pressure sensitive sensor nodes. The pressure sensitive sensor nodes may have a size and pitch that is sufficient to recognize gestures, e.g., made by a finger of a user's hand, a stylus, and so on, by detecting an input as involving motion across a plurality of the keys. Additionally, the array may also be configured such that collections of the pressure sensitive sensor nodes are mapped to particular inputs (e.g., keys of a keyboard) to also function as a keyboard, track pad, and so on. The input device may be configured in a variety of ways to implement pressure sensitive sensor nodes having this functionality. The input device may also be configured to promote a relative thin form factor for the input device overall, e.g., less than three millimeters. This may be performed through use of force concentrator pads, integrated spacers, and so on. In this way, the input device may be configured to support a variety of different types of input functionality and may do so in a manner that maintains mobility of the mobile computing device to which it may be attached.
Additionally, the input device may also be configured to incorporate a capacitive sensor assembly. For instance, the capacitive sensor assembly may be configured to detect proximity of an object, and when so detected, wake other functionality of the input device (e.g., backlighting, operation of the pressure sensitive sensor nodes, and so on) and/or a computing device communicatively coupled to the input device. The capacitive sensor assembly may also operate in conjunction with the pressure sensitive sensor nodes to expose inputs having an increased richness to a computing device. The capacitive sensor assembly, for instance, may be employed to provide a location of an object and the pressure sensitive sensor nodes may be utilized to indicate an amount of pressure (i.e., a “z” indication). These inputs may be leveraged by the computing device to recognize gestures, gaming inputs, and so on and thus may provide increased input functionality to a user. A variety of other examples are also contemplated, further discussion of which may be found in relation to the following sections.
In the following discussion, an example environment is first described that may employ the input device configuration techniques described herein. Examples of layers that are usable in the example environment (i.e., the input device) are then described which may be performed in the example environment as well as other environments. Consequently, use of the example layers is not limited to the example environment and the example environment is not limited to use of the example layers.
Example Environment
FIG. 1 is an illustration of an environment 100 in an example implementation that is operable to employ the techniques described herein. The illustrated environment 100 includes an example of a computing device 102 that is physically and communicatively coupled to an input device 104 via a flexible hinge 106. The computing device 102 may be configured in a variety of ways. For example, the computing device 102 may be configured for mobile use, such as a mobile phone, a tablet computer as illustrated, and so on that is configured to be held by one or more hands of a user. Thus, the computing device 102 may range from full resource devices with substantial memory and processor resources to a low-resource device with limited memory and/or processing resources. The computing device 102 may also relate to software that causes the computing device 102 to perform one or more operations.
The computing device 102, for instance, is illustrated as including an input/output module 108. The input/output module 108 is representative of functionality relating to processing of inputs and rendering outputs of the computing device 102. A variety of different inputs may be processed by the input/output module 108, such as inputs relating to functions that correspond to keys of the input device 104, keys of a virtual keyboard displayed by the display device 110 to identify gestures and cause operations to be performed that correspond to the gestures that may be recognized through the input device 104 and/or touchscreen functionality of the display device 110, and so forth. Thus, the input/output module 108 may support a variety of different input techniques by recognizing and leveraging a division between types of inputs including key presses, gestures, and so on.
In the illustrated example, the input device 104 is configured as having an input portion that includes a keyboard having a QWERTY arrangement of keys and track pad although other arrangements of keys are also contemplated. Further, other non-conventional configurations are also contemplated, such as a game controller, configuration to mimic a musical instrument, and so forth. Thus, the input device 104 and keys incorporated by the input device 104 may assume a variety of different configurations to support a variety of different functionality.
As previously described, the input device 104 is physically and communicatively coupled to the computing device 102 in this example through use of a flexible hinge 106. The flexible hinge 106 is flexible in that rotational movement supported by the hinge is achieved through flexing (e.g., bending) of the material forming the hinge as opposed to mechanical rotation as supported by a pin, although that embodiment is also contemplated. Further, this flexible rotation may be configured to support movement in one or more directions (e.g., vertically in the figure) yet restrict movement in other directions, such as lateral movement of the input device 104 in relation to the computing device 102. This may be used to support consistent alignment of the input device 104 in relation to the computing device 102, such as to align sensors used to change power states, application states, and so on.
The flexible hinge 106, for instance, may be formed using one or more layers of fabric and include conductors formed as flexible traces to communicatively couple the input device 104 to the computing device 102 and vice versa. This communication, for instance, may be used to communicate a result of a key press to the computing device 102, receive power from the computing device, perform authentication, provide supplemental power to the computing device 102, and so on.
FIG. 2 depicts an example implementation 200 of the input device 104 of FIG. 1 as showing the flexible hinge 106 in greater detail. In this example, a connection portion 202 of the input device is shown that is configured to provide a communicative and physical connection between the input device 104 and the computing device 102. The connection portion 202 as illustrated has a height and cross section configured to be received in a channel in the housing of the computing device 102, although this arrangement may also be reversed without departing from the spirit and scope thereof.
The connection portion 202 is flexibly connected to a portion of the input device 104 that includes the keys through use of the flexible hinge 106. Thus, when the connection portion 202 is physically connected to the computing device 102 the combination of the connection portion 202 and the flexible hinge 106 supports movement of the input device 104 in relation to the computing device 102 that is similar to a hinge of a book.
Through this rotational movement, a variety of different orientations of the input device 104 in relation to the computing device 102 may be supported. For example, rotational movement may be supported by the flexible hinge 106 such that the input device 104 may be placed against the display device 110 of the computing device 102 and thereby act as a cover. Thus, the input device 104 may act to protect the display device 110 of the computing device 102 from harm.
The connection portion 202 may be secured to the computing device in a variety of ways, an example of which is illustrated as including magnetic coupling devices 204, 206 (e.g., flux fountains), mechanical coupling protrusions 208, 210, and a plurality of communication contacts 212. The magnetic coupling devices 204, 206 are configured to magnetically couple to complementary magnetic coupling devices of the computing device 102 through use of one or more magnets. In this way, the input device 104 may be physically secured to the computing device 102 through use of magnetic attraction.
The connection portion 202 also includes mechanical coupling protrusions 208, 210 to form a mechanical physical connection between the input device 104 and the computing device 102. The mechanical coupling protrusions 208, 210 are shown in greater detail in relation to FIG. 3, which is discussed below.
FIG. 3 depicts an example implementation 300 showing a perspective view of the connection portion 202 of FIG. 2 that includes the mechanical coupling protrusions 208, 210 and the plurality of communication contacts 212. As illustrated, the mechanical coupling protrusions 208, 210 are configured to extend away from a surface of the connection portion 202, which in this case is perpendicular although other angles are also contemplated.
The mechanical coupling protrusions 208, 210 are configured to be received within complimentary cavities within the channel of the computing device 102. When so received, the mechanical coupling protrusions 208, 210 promote a mechanical binding between the devices when forces are applied that are not aligned with an axis that is defined as correspond to the height of the protrusions and the depth of the cavity.
The connection portion 202 is also illustrated as including a plurality of communication contacts 212. The plurality of communication contacts 212 is configured to contact corresponding communication contacts of the computing device 102 to form a communicative coupling between the devices as shown. The connection portion 202 may be configured in a variety of other ways, including use of a rotational hinge, mechanical securing device, and so on. In the following, an example of a docking apparatus 112 is described and shown in a corresponding figure.
FIG. 4 depicts an example implementation 400 showing a cross section of input device 104 of FIG. 1. The outer layer 402 is configured to supply an outer surface of the input device 104 with which a user may touch and interact. The outer layer 402 may be formed in a variety of ways, such as from a fabric material, e.g., a backlight compatible polyurethane with a heat emboss for key formation, use of a laser to form indications of inputs, and so on.
Beneath the outer layer is a smoothing layer 404. The smoothing layer 404 may be configured to support a variety of different functionality. This may include use as a support to reduce wrinkling of the outer layer 402, such as through formation as a thin plastic sheet, e.g., approximately 0.125 millimeters of polyethylene terephthalate (PET), to which the outer layer 402 is secured through use of an adhesive. The smoothing layer 404 may also be configured to including masking functionality to reduce and even eliminate unwanted light transmission, e.g., “bleeding” of light through the smoothing layer 404 and through a fabric outer layer 402. The smoothing layer also provides a continuous surface under the outer layer, such that it hides any discontinuities or transitions between the inner layers.
A light guide 406 is also illustrated, which may be included as part of a backlight mechanism to support backlighting of indications (e.g., legends) of inputs of the input device 104. This may include illumination of keys of a keyboard, game controls, gesture indications, and so on. The light guide 406 may be formed in a variety of ways, such as from a 250 micron thick sheet of a plastic, e.g., a clear polycarbonate material with etched texturing. Additional discussion of the light guide 406 may be found beginning in relation to FIG. 5.
A sensor assembly 408 is also depicted. Thus, as illustrated the light guide 406 and the smoothing layer 404 are disposed between the outer layer 402 and the sensor assembly 408. The sensor assembly 408 is configured detect proximity of an object to initiate an input. The detected input may then be communicated to the computing device 102 (e.g., via the connection portion 202) to initiate one or more operations of the computing device 102. The sensor assembly 408 may be configured in a variety of ways to detect proximity of inputs, such as a capacitive sensor array, a plurality of pressure sensitive sensor nodes (e.g., membrane switches using a force sensitive ink), mechanical switches, a combination thereof, and so on.
A structure assembly 410 is also illustrated. The structure assembly 410 may be configured in a variety of ways, such as a trace board and backer that are configured to provide rigidity to the input device 104, e.g., resistance to bending and flexing. A backing layer 412 is also illustrated as providing a rear surface to the input device 104. The backing layer 412, for instance, may be formed from a fabric similar to an outer layer 402 that omits one or more sub-layers of the outer layer 402, e.g., a 0.38 millimeter thick fabric made of wet and dry layers of polyurethane. Although examples of layers have been described, it should be readily apparent that a variety of other implementations are also contemplated, including removal of one or more of the layers, addition of other layers (e.g., a dedicated force concentrator layer, mechanical switch layer), and so forth. Thus, the following discussion of examples of layers is not limited to incorporation of those layer in this example implementation 400 and vice versa.
FIG. 5 depicts an example implementation 500 of a backlight mechanism as including a light guide 406 of FIG. 4 and a light source. As previously described, the light guide 406 may be configured in a variety of ways to support transmission of light that is to act as a backlight for the input device 102. For example, the light guide 406 may be configured from a clear plastic or other material that supports transmission of light from a light source 502, which may be implemented using one or more light emitting diodes (LEDs). The light guide 406 is positioned to receive the emitted light from the light source 502 through a side of the light guide 406 and emit the light through one or more other sides and/or surface regions of the light guide 406.
The light guide 406, for instance, may be configured to output light at specific locations through use of etching, embossing, contact by another material having a different refractive index (e.g., an adhesive disposed on the plastic of the light guide 406), and so on. In another example, the light guide 406 may be configured as a universal light guide such that a majority (and even entirety) of a surface of the light guide 406 may be configured output light, e.g., through etching of a majority of a surface 504 of the light guide 406. Thus, instead of specially configuring the light guide 406 in this example, the same light guide maybe used to output different indications of inputs, which may be used to support different languages, arrangements of inputs, and so on by the input device 104.
As previously described, however, this could cause bleeding of light through adjacent surfaces to the light guide in conventional techniques, such as through an outer layer 402 of fabric to give a “galaxy” effect, pinholes, and so on. Accordingly, one or more of these adjacent layers may be configured to reduce and even prevent transmission of light in undesirable locations. For example, the outer layer may include sub-layers having progressively darker shades of a color to enable use of a light surface color yet restrict transmission of light through the fabric, a mask of ink may be printed (e.g., to the smoothing layer 404) to absorb light at particular locations (e.g., near the light source), and so on. A variety of other examples are also contemplated.
FIG. 6 depicts an example implementation 600 in which a layer of the sensor assembly 408 is shown in a cross section, the layer configured to support implementation of pressure sensitive sensor nodes. A flexible contact layer 602 (e.g., Mylar) of a pressure sensitive sensor node is illustrated in this example that is configured to flex to initiate contact and thus an input. In this example, the flexible contact layer 402 does not performed this contact absent application of pressure against the flexible contact layer 602 as further described in relation to FIG. 7.
The flexible contact layer 602 in this example includes a force sensitive ink 604 disposed on a surface of the flexible contact layer 602. The force sensitive ink 604 is configured such that an amount of resistance of the ink varies directly in relation to an amount of pressure applied. The force sensitive ink 604, for instance, may be configured with a relatively rough surface that is compressed against another surface (e.g., a conductor as shown in FIG. 7) upon an application of pressure against the flexible contact layer 602. The greater the amount of pressure, the more the force sensitive ink 604 is compressed, thereby increasing conductivity and decreasing resistance of the force sensitive ink 604. Other conductors may also be disposed on the flexible contact layer 604 without departing form the spirit and scope therefore, including other types of pressure sensitive and non-pressure sensitive conductors.
The flexible contact layer 602 is also illustrated as including spacers 606 formed on the same surface of the flexible contact layer 602 as the force sensitive ink 604. The spacers 606 define openings through which the flexible contact layer 602 is to flex to initiate inputs. The spacers 606 may be configured in a variety of ways, such as through use of a dielectric spacer material having a height of approximately 6.5 um. The flexible contact layer 602 is also illustrated as including a securing mechanism 608 (e.g., 25 um of adhesive) to secure the flexible contact layer 602 to an adjacent layer of the pressure sensitive sensor node assembly.
Force contractor pads 610 are also illustrated as disposed on an opposing side of the flexible contact layer 602 in relation to the side of flexible contact layer 602 that includes the force sensitive ink 604. The force concentrator pads 610 are illustrated as secured to and/or a part of the flexible contact layer 602, such as formed from a material to have a height of approximately 50 um. The force concentrator pads have a cross section along an axis of the flexible contact layer 602 that approximates a cross section of the force sensitive ink 604 disposed on an opposing side of the flexible contact layer 602. The force concentrator pads 610 may be configured to channel pressure applied to the input device 104 to promote consistent contact of the force sensitive ink 606, further discussion of which may be found beginning in relation to the discussion of FIG. 8.
FIG. 7 depicts an example implementation 700 in which the flexible contact layer 602 of FIG. 6 is shown in cross section as combined with a sensor substrate 702 to form a pressure sensitive sensor node assembly. The sensor substrate 702 may be configured in a variety of ways, such as a printed circuit board (PCB) having conductors 704 disposed thereon.
The conductors 704 are configured to be contacted by the force sensitive ink 604 of the flexible contact layer 602. When contacted, an analog signal may be generated for processing by the input device 104 and/or the computing device 102, e.g., to recognize whether the signal is likely intended by a user to provide an input for the computing device 102. A variety of different types of conductors 704 may be disposed on the sensor substrate 702, such as formed from a variety of conductive materials (e.g., silver, copper), disposed in a variety of different configurations as further described in relation to FIG. 10, and so on.
The sensor substrate 702 is also illustrated as including spacers 706. The spacers 706 are disposed on the same surface as the conductors 704 on the sensor substrate 702 in an area between the conductors. The spacers 706 of the sensor substrate 702 and the spacers 606 of the flexible contact layer 602 may be positioned to form a spacer assembly as shown in the figure, e.g., having a total height of 41 um. This height may thus cause the force sensitive ink 604 of the flexible contact layer 602 to be spaced apart from the conductors 604 of the sensor substrate 702.
Application of a pressure against the flexible contact layer 602 may cause the flexible contact layer 602 to flex through an opening formed by the spacer assembly to contact the conductors 704 of the sensor substrate 702. As previously described, the amount of pressure may be communicated through different resistances of the force sensitive ink 604 to provide an output that indicates an amount of pressure that was applied, e.g., with twelve bits of resolution as further described below.
The securing mechanism 608 (e.g., the adhesive described in relation to FIG. 6) may be used to secure the flexible contact layer 602 to the sensor substrate 702. This may be performed directly to a surface of the sensor substrate 702, include use of a solder mask 708 having a height approximating the force sensitive ink 604 to increase a height of a gap between the ink and the conductors 704, and so on.
The flexible contact layer 602 is also illustrated as secured to the light guide 406 through use of the previously described adhesives 612. As this may cause light to bleed from the light guide 406, the flexible contact layer 602 may be configured to promote reflectance of this light (e.g., by being colored white). Additionally, to reduce an amount of light bleed “upward” through the smoothing layer 404 and outer surface 402 of FIG. 4, a lesser surface area of adhesive 710 may be used to secure the smoothing layer 404 to the light guide 406 than is used to secure the light guide 406 to the flexible contact layer 602. Other techniques may also be utilized to reduce this light bleed, such as to include a mask 712 printed as a black ink to portions of the smoothing layer 404 that are secured to the light guide 406, e.g., that have adhesive disposed thereon.
FIG. 8 depicts an example implementation 800 of a pressure sensitive sensor node of FIGS. 6 and 7 as employing a force concentrator pad 610. In this example, the flexible contact layer 602 is spaced apart from the sensor substrate 702 through use of a space assembly 802, which may employ the spacers 606, 706 of FIGS. 6 and 7. The force concentrator pad 610 may be implemented in a variety of ways, such as part of the flexible contact layer 602 as illustrated, as a stand-alone layer, as part of a smoothing layer 404, and so on.
As previously described, the flexible contact layer 602 may be configured from a variety of materials, such as a flexible material (e.g., Mylar) that is capable of flexing to contact a sensor substrate 702. The flexible contact layer 602 in this instance includes a force concentrator pad 610 disposed thereon that is raised from a surface of the flexible contact layer 602. Thus, the force concentrator pad 610 is configured as a protrusion to contact another layer of the input device 104, such as the light guide 406, smoothing layer 404, outer surface 402, and so on. The force concentrator pad 610 may be formed in a variety of ways, such as formation as a layer (e.g., printing, deposition, forming, etc.) on a substrate of the flexible contact layer 602 (e.g., Mylar), as an integral part of the substrate itself, and so on.
FIG. 9 an example 900 of the pressure sensitive sensor node 800 of FIG. 8 as having pressure applied at a plurality of different locations of the flexible contact layer 602 to cause contact with the sensor substrate 702. The pressure is illustrated through use of arrows, which in this instance include first, second, and third locations 902, 904, 906 which are positioned at distances that are respectively closer to an edge of the sensor, e.g., an edge defined by the spacer assemblies 802.
As illustrated, the force concentrator pad 610 is sized so as to permit the flexible contact layer 602 to flex between the spacer assemblies 802. The force concentrator pad 610 is configured to provide increased mechanical stiffness and thus improved resistance to localized bending and flexing around a single sensor, e.g., as in comparison with a substrate (e.g., Mylar) of the flexible contact layer 602 alone. Therefore, when the force concentrator pad 610 receives pressures (e.g., is “pressed”), the flexible contact layer 602 has a decreased bend radius than would otherwise be the case.
Thus, the bending of a substrate of the flexible contact layer 602 around the force concentrator pad 610 may promote a relatively consistent contact area between the force sensitive ink 604 and the conductors 704 of the sensor substrate 702. This may promote normalization of a signal produced by the key, e.g., to address “off center” contact.
The force concentrator pad 610 may also act to spread a contact area of a source of the pressure. The flexible contact layer 602, for instance, may receive a pressure caused by a fingernail, a tip of a stylus, pen, or other object that has a relatively small contact area. This could result in correspondingly small contact area of the flexible contact layer 602 that contacts the sensor substrate 702, and thus a corresponding decrease in signal strength.
However, due to the mechanical stiffness of the force concentrator pad 610, this pressure may be spread across an area of the force concentrator pad 610, which is then spread across an area of the flexible contact layer 602 that correspondingly bends around the spacer assemblies 802 to contact the sensor substrate 702. In this way, the force concentrator pad 610 may be used to distribute and normalize a contact area between the flexible contact layer 602 and the sensor substrate 702 that is used to generate a signal by the pressure sensitive sensor node.
The force concentrator pad 610 may also act to channel pressure, even if this pressure is applied “off center.” For example, the flexibility of the flexible contact layer 602 may depend at least partially on a distance from an edge of the pressure sensitive sensor node, e.g., an edge defined by the spacer assembly 802 in this instance.
The force concentrator pad 610, however, may be used to channel pressure to the flexible contact layer 602 to promote relatively consistent contact. For example, pressure applied at a first location 902 that is positioned at a general center region of the flexible contact layer 602 may cause contact that is similar to contact achieved when pressure applied at a second location 904 that is positioned at an edge of the force concentrator pad 610. Pressures applied outside of a region defined by the force concentrator pad 610 may also be channeled through use of the force concentrator pad 610, such as a third position 906 that is located outside of the region defined by the force concentrator pad 610 but within an edge of the key. A position that is located outside of a region of the flexible contact layer 602 defined by the spacer assembly 802 may also be channeled to cause the flexible contact layer 602 to contact the sensor substrate 702 as illustrated. A variety of different configurations of pressure sensitive sensor assemblies may leverage the pressures sensitive keys previously described, an example of which is described as follows and shown in a corresponding figure.
FIG. 10 depicts an example implementation 1000 in which a pressure sensitive sensor nodes are arranged in an array (e.g., a pool) that is configured to support gesture detection and use for a plurality of different input configurations. In this example, a pressure sensitive sensor assembly 1002 of the input device 104 includes a plurality of pressure sensitive sensor nodes, which are illustrated as having a generally uniform size and spacing in a square shape, although other sizes, spacings, and arrangements are also contemplated without departing from the spirit and scope thereof.
An enlarged example of a conductor 704 of the pressure sensitive sensor assembly 1002 is also shown. In this example, conductors 704 of the sensor substrate 702 are configured in first and second portions of inter-digitated trace fingers. Thus, a pressure applied to the flexible contact layer 602 may cause the force sensitive ink 604 to contact the conductors 804 and act as a shunt to permit a flow of electricity between the first and second portions of inter-digitated trace fingers. Other examples are also contemplated, such as to the first portion on the flexible contact layer 602 and the second portion on the sensor substrate 702 with the force sensitive ink being disposed between the layers having the portions.
In the illustrated example, the input device 104 includes an array of sensors spaced in a generally uniform manner, e.g., individual sensors placed approximately five millimeters apart on center in a grid arrangement. The sensors are illustrated as squares in the example although other sizes and arrangements are also contemplated, such as staggered generally circular sensors and so on. Further, the sensors may be configured in a variety of ways, such as pressure sensitive sensors, include a capacitive grid as described in relation to FIG. 13, and so on.
The size and spacing of the sensors may be configured in a variety of ways. For example, a surface area of the sensor may be configured to have a surface area of approximately 25 millimeters (e.g., a 5×5 square or less), may be configured to have a surface area of approximately nine millimeters (e.g., a 3×3 square), may be configured to have a surface area of approximately 2.25 millimeters (e.g., a 1.5×1.5 square configured to detect a fingernail, stylus, and so on), have a pitch of approximately five millimeters or less, and so on. Additionally, a variety of different detection and sampling rates may be supported, such as a one kilohertz sampling rate with twelve bits of resolution (e.g., to indicate pressure) and may be responsive to twenty five grams of pressure. In this way, the array may be configured to detect gestures across a sequence of the sensors, may support dynamic mapping of key presses to corresponding indications as described in relation to FIG. 11, and so on. It should be readily apparent that a wide variety of other examples are also contemplated. Regardless of how implemented, sensors of the array may thus correspond to indications of inputs of the outer surface 402 of the input device 104, further discussion of which is described as follows and shown in a corresponding figure.
FIG. 11 depicts an implementation 1100 showing examples of indications 1102, 1104 of inputs of the outer layer 402 of FIG. 4 as corresponding to a plurality of underlying pressure sensitive sensor nodes of an array of FIG. 10. The first indication 402 is taken from the outer layer 402 and shows the letter “A” of a QWERTY keyboard that, once selected (e.g., pressed) is to cause a corresponding input to be provided by the input device 104 to the computing device 102.
The indication 1102 is disposed over four sensors of the array of the pressure sensitive sensor assembly 1002 of FIG. 10, which are illustrated in phantom. Accordingly, a mapping may be employed such that an output from any, all, or a combination thereof of these sensors is recognized by the computing device 102 as the indicated input, e.g., a key press of the letter “A.”
Likewise, indication 1104 is taken from a game controller is of an input for a rocker control, such as to provide inputs to control direction of an object in a game. The indication 1104 is also disposed over a plurality of sensors (e.g., the pressure sensitive sensor nodes of the array of FIG. 10), which are also illustrated in phantom. Accordingly, a mapping may be employed such that an output from any, all, or a combination thereof of these sensors is recognized by the computing device 102 as the indicated input, e.g., different directions dependent on which part of the rocker control receives contact.
Additionally, techniques may be employed to detect a centroid of a contact to determine a likely intent of a contact received by a user. For the indication 1104 of the rocker control, for instance, a centroid of a user's finger may be detected to determine a likely direction. This technique may also be employed to determine which of a plurality of indications likely correspond to an input, such as when a user contacts a border between multiple indications the centroid may be used to determine which indication and corresponding sensor is likely intended as an input by a user. Capacitive sensors may also be incorporated to aid this detection as further described beginning in relation to FIG. 13. Although a generally uniform array of sensors was described, other arrangements may also be employed that are not uniform, e.g., to follow a configuration of a QWERTY keyboard and map other functionality such as a game controller over this configuration.
FIG. 12 depicts an example implementation 1200 of the input device 104 as including a pressure sensitive sensor assembly 1202 and a capacitive sensor assembly 1204. The pressure sensitive sensor assembly 1202 may be configured in a variety of ways, such as an array as described in relation to FIG. 10, one to one correspondence between indications of keys of FIG. 1 and underlying sensors, and so on. In the illustrated example, the pressure sensitive sensor assembly 1202 is illustrated in phantom as disposed underneath indications of keys of a keyboard of FIG. 1.
The input device 104 also includes capacitive sensor assemblies 1204 which are illustrated as disposed beneath palm rests of the input device 104 although other configurations as also contemplated as further described below. The capacitive sensor assemblies 1204 are configured to detect proximity of an object, such as a finger of a user's hand 1206 as illustrated, a stylus, or other object. This detection may be leveraged to support a wide variety of different functionality. For example, the capacitive sensor assemblies 1204 may remain operational (e.g., awake) while other functionality of the input device 104 (e.g., the pressure sensitive sensor node assembly 1202, backlighting, and so on), computing device 102, and so on are in a non-operational state, e.g., a sleep state, hibernation state, “off,” and so on. This may be performed to reduce power consumption by these devices.
Responsive to detection of an object (e.g., the finger of the user's hand 1206), the input device 104 may cause this other functionality of the input device 104 and/or computing device 102 to “wake.” For example, this may cause examination of an output of a camera of the computing device 102 and/or input device 104 to determine whether to turn the backlighting of the input device 104 “on” based on an amount of light detected in the surroundings of the device, place the pressure sensitive sensor assembly 1202 in an operational state to detect pressure, and so on. In this way, the capacitive sensor assembly 1204 may be utilized to conserve power consumed by the input device 104 and/or the computing device 102 as well as increase responsiveness of these devices, e.g., by waking before contact is even received by the pressure sensitive sensor node assembly. Additionally, this may be utilized to protect against inadvertent presses of the keys of the input device 104, such as in combination with detection of a location of the input device 104 in relation to the computing device 102, e.g., positioned at a rear of the computing device 102 through use of a Hall Effect sensor, accelerometers, magnetometers, and so forth.
The capacitive sensor assembly 1204 may be configured in a variety of ways to perform this object detection. For example, the capacitive sensor assembly 1204 may be configured in a portion of the input device 104 that is separate and non-overlapping from a portion including the pressure sensitive sensor assembly 1202 as shown in FIG. 12. In this example, the capacitive sensor assembly 1204 may be configured to detect presence of an object but not a specific location of the object beyond the presence of the object in a sensing range of capacitive sensors of the capacitive sensor assembly 1204. The capacitive sensor assembly 1204 may also be configured to be interspersed between the pressure sensitive sensor nodes of the pressure sensitive sensor node assembly, an example of which is described in relation to FIG. 13. In yet another example, the capacitive sensor assembly 1204 may be formed as a layer that is disposed proximal to a layer of the pressure sensitive sensor node assembly, an example of which is described in relation to FIG. 14.
FIG. 13 depicts an example implementation 1300 in which pressure sensitive sensor nodes of a pressure sensitive sensor assembly 1202 are interspersed with capacitive sensors of a capacitive sensor assembly 1204. In this example, the conductors 704 of the pressure sensitive sensor nodes are formed on the sensor substrate 702 as inter-digitated trace fingers as described above. Capacitive trace lines of the capacitive sensor assembly 1204 are also illustrated.
Thus, in this example the pressure sensitive sensor nodes (e.g., sensor nodes) are embedded into a capacitive sensor array to support both capacitive location and pressure input to be reported by the input device 104. Accuracy and linearity of the capacitive sensor assembly 1204 may support a high degree of positional accuracy at virtually non-contact use inputs to support gesturing, mousing movements, and so on.
Additionally, integration of the pressure sensitive sensor nodes of the pressure sensitive sensor assembly 1202 supports pressure readings at each discrete location of capacitive touch events detected by the capacitive sensor assembly 1204. This may also be utilized to support a thin form factor of the input device 104 as a whole that is configured to detect position and pressure at multiple, discrete user inputs. In one or more implementations, conductors of the capacitive sensors and the conductors 704 of the pressure sensitive sensor nodes may be incorporated at the same layer of the input device 104, e.g., the sensor substrate 702 of FIG. 7. Other examples are also contemplated, one such example is described as follows and shown in a corresponding figure.
FIG. 14 depicts an example implementation 1400 in which the capacitive sensor assembly 1204 is configured as a layer and disposed proximal to a layer of a pressure sensitive sensor assembly 1202. In this example, the layers are disposed adjacent to each other and are incorporated as part of a track pad, although other configurations are also contemplated. For instance, the capacitive sensor assembly 1204 may be leveraged to detect location as before whereas the pressure sensitive sensor assembly 1202 may be utilized to detect pressure, e.g., a “z” axis input in addition to the “x” and “y” location inputs of the capacitive sensor assembly 1204. In another example, this may be utilized to implement a plurality of keys as part of the track pad that are usable to initiate different inputs in addition to the moussing input supported by the track pad. A variety of other examples are also contemplated without departing from the spirit and scope thereof.
Example System and Device
FIG. 15 illustrates an example system generally at 1500 that includes an example computing device 1502 that is representative of one or more computing systems and/or devices that may implement the various techniques described herein. The computing device 1502 may be, for example, be configured to assume a mobile configuration through use of a housing formed and size to be grasped and carried by one or more hands of a user, illustrated examples of which include a mobile phone, mobile game and music device, and tablet computer although other examples are also contemplated. The input device 1514 may also be configured to incorporate a pressure sensitive sensor assembly 1202 and a capacitive sensor assembly 1204 as previously described.
The example computing device 1502 as illustrated includes a processing system 1504, one or more computer-readable media 1506, and one or more I/O interface 1508 that are communicatively coupled, one to another. Although not shown, the computing device 1502 may further include a system bus or other data and command transfer system that couples the various components, one to another. A system bus can include any one or combination of different bus structures, such as a memory bus or memory controller, a peripheral bus, a universal serial bus, and/or a processor or local bus that utilizes any of a variety of bus architectures. A variety of other examples are also contemplated, such as control and data lines.
The processing system 1504 is representative of functionality to perform one or more operations using hardware. Accordingly, the processing system 1504 is illustrated as including hardware element 1510 that may be configured as processors, functional blocks, and so forth. This may include implementation in hardware as an application specific integrated circuit or other logic device formed using one or more semiconductors. The hardware elements 1510 are not limited by the materials from which they are formed or the processing mechanisms employed therein. For example, processors may be comprised of semiconductor(s) and/or transistors (e.g., electronic integrated circuits (ICs)). In such a context, processor-executable instructions may be electronically-executable instructions.
The computer-readable storage media 1506 is illustrated as including memory/storage 1512. The memory/storage 1512 represents memory/storage capacity associated with one or more computer-readable media. The memory/storage component 1512 may include volatile media (such as random access memory (RAM)) and/or nonvolatile media (such as read only memory (ROM), Flash memory, optical disks, magnetic disks, and so forth). The memory/storage component 1512 may include fixed media (e.g., RAM, ROM, a fixed hard drive, and so on) as well as removable media (e.g., Flash memory, a removable hard drive, an optical disc, and so forth). The computer-readable media 1506 may be configured in a variety of other ways as further described below.
Input/output interface(s) 1508 are representative of functionality to allow a user to enter commands and information to computing device 1502, and also allow information to be presented to the user and/or other components or devices using various input/output devices. Examples of input devices include a keyboard, a cursor control device (e.g., a mouse), a microphone, a scanner, touch functionality (e.g., capacitive or other sensors that are configured to detect physical touch), a camera (e.g., which may employ visible or non-visible wavelengths such as infrared frequencies to recognize movement as gestures that do not involve touch), and so forth. Examples of output devices include a display device (e.g., a monitor or projector), speakers, a printer, a network card, tactile-response device, and so forth. Thus, the computing device 1502 may be configured in a variety of ways to support user interaction.
The computing device 1502 is further illustrated as being communicatively and physically coupled to an input device 1514 that is physically and communicatively removable from the computing device 1502. In this way, a variety of different input devices may be coupled to the computing device 1502 having a wide variety of configurations to support a wide variety of functionality. In this example, the input device 1514 includes one or more keys 1516, which may be configured as pressure sensitive sensor nodes, mechanically switched keys, and so forth.
The input device 1514 is further illustrated as include one or more modules 1518 that may be configured to support a variety of functionality. The one or more modules 1518, for instance, may be configured to process analog and/or digital signals received from the keys 1516 to determine whether a keystroke was intended, determine whether an input is indicative of resting pressure, support authentication of the input device 1514 for operation with the computing device 1502, and so on.
Various techniques may be described herein in the general context of software, hardware elements, or program modules. Generally, such modules include routines, programs, objects, elements, components, data structures, and so forth that perform particular tasks or implement particular abstract data types. The terms “module,” “functionality,” and “component” as used herein generally represent software, firmware, hardware, or a combination thereof. The features of the techniques described herein are platform-independent, meaning that the techniques may be implemented on a variety of commercial computing platforms having a variety of processors.
An implementation of the described modules and techniques may be stored on or transmitted across some form of computer-readable media. The computer-readable media may include a variety of media that may be accessed by the computing device 1502. By way of example, and not limitation, computer-readable media may include “computer-readable storage media” and “computer-readable signal media.”
“Computer-readable storage media” may refer to media and/or devices that enable persistent and/or non-transitory storage of information in contrast to mere signal transmission, carrier waves, or signals per se. Thus, computer-readable storage media refers to non-signal bearing media. The computer-readable storage media includes hardware such as volatile and non-volatile, removable and non-removable media and/or storage devices implemented in a method or technology suitable for storage of information such as computer readable instructions, data structures, program modules, logic elements/circuits, or other data. Examples of computer-readable storage media may include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical storage, hard disks, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or other storage device, tangible media, or article of manufacture suitable to store the desired information and which may be accessed by a computer.
“Computer-readable signal media” may refer to a signal-bearing medium that is configured to transmit instructions to the hardware of the computing device 1502, such as via a network. Signal media typically may embody computer readable instructions, data structures, program modules, or other data in a modulated data signal, such as carrier waves, data signals, or other transport mechanism. Signal media also include any information delivery media. The term “modulated data signal” means a signal that has one or more of its characteristics set or changed in such a manner as to encode information in the signal. By way of example, and not limitation, communication media include wired media such as a wired network or direct-wired connection, and wireless media such as acoustic, RF, infrared, and other wireless media.
As previously described, hardware elements 1510 and computer-readable media 1506 are representative of modules, programmable device logic and/or fixed device logic implemented in a hardware form that may be employed in some embodiments to implement at least some aspects of the techniques described herein, such as to perform one or more instructions. Hardware may include components of an integrated circuit or on-chip system, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), a complex programmable logic device (CPLD), and other implementations in silicon or other hardware. In this context, hardware may operate as a processing device that performs program tasks defined by instructions and/or logic embodied by the hardware as well as a hardware utilized to store instructions for execution, e.g., the computer-readable storage media described previously.
Combinations of the foregoing may also be employed to implement various techniques described herein. Accordingly, software, hardware, or executable modules may be implemented as one or more instructions and/or logic embodied on some form of computer-readable storage media and/or by one or more hardware elements 1510. The computing device 1502 may be configured to implement particular instructions and/or functions corresponding to the software and/or hardware modules. Accordingly, implementation of a module that is executable by the computing device 1502 as software may be achieved at least partially in hardware, e.g., through use of computer-readable storage media and/or hardware elements 1510 of the processing system 1504. The instructions and/or functions may be executable/operable by one or more articles of manufacture (for example, one or more computing devices 1502 and/or processing systems 1504) to implement techniques, modules, and examples described herein.
CONCLUSION
Although the example implementations have been described in language specific to structural features and/or methodological acts, it is to be understood that the implementations defined in the appended claims is not necessarily limited to the specific features or acts described. Rather, the specific features and acts are disclosed as example forms of implementing the claimed features.

## Claims

1. An input device comprising:
a capacitive sensor assembly arranged on a sensor substrate, the capacitive sensor assembly configured to detect a contact of an object that is proximal to a respective capacitive sensor of the capacitive sensor assembly and, responsive to the detection, cause functionality of the input device that is not related to the capacitive sensor assembly to be placed in an operational state, the functionality being in a non-operational state prior to the detection of the contact; and
a pressure sensitive sensor assembly arranged on the sensor substrate, the pressure sensitive sensor assembly configured to detect varying amounts of pressure applied to respective pressure sensitive sensor nodes of the pressure sensitive sensor assembly.

2. An input device as described in claim 1, wherein the sensor substrate is part of the pressure sensitive sensor assembly.

3. An input device as described in claim 1, wherein the pressure sensitive sensor nodes are associated with keys of a keyboard and the capacitive sensor assembly is associated with a palm rest of the input device.

4. An input device as described in claim 1, wherein a location and the varying amounts of pressure are configured to be communicated as an input to a computing device.

5. An input device as described in claim 4, wherein the input is usable to detect a gesture by the computing device.

6. An input device as described in claim 1, wherein the pressure sensitive sensor assembly includes:
a sensor substrate having one or more conductors;
a flexible contact layer spaced apart from the sensor substrate that is configured to flex to contact the sensor substrate to initiate a corresponding input.

7. An input device as described in claim 6, wherein the sensor substrate includes:
one or more conductors that when contacted by the flexible contact layer initiate the corresponding input; and
conductors used to form the capacitive sensor assembly.

8. An input device as described in claim 1, wherein the detection of the object as proximal is configured to place the pressure sensitive sensor assembly in the operational state.

9. An input device as described in claim 1, wherein the plurality of pressure sensitive sensor nodes are formed using a force sensitive ink.

10. A method comprising:
causing functionality of an input device that is not related to one or more capacitive sensors of the input device to be placed in a non-operational state, the input device configured to communicate one or more inputs to a computing device;
detecting that an object is located proximal to one or more of the capacitive sensors; and
responsive to the detection, causing the functionality of the input device that is not related to the capacitive sensors to be placed in an operational state while still detecting the object as proximal to the one or more capacitive sensors.

11. A method as described in claim 10, wherein the functionality includes placing a pressure sensitive sensor assembly of the input device in the operational state such that one or more pressure sensitive sensor nodes of the pressure sensitive sensor assembly are configured to detect an amount of pressure applied by the object or another object to respective areas of the input device and provide the detected amount of pressure as a respective said input to the computing device.

12. A method as described in claim 11, wherein the pressure sensitive sensor nodes are interspersed throughout the capacitive sensors.

13. A method as described in claim 11, wherein the pressure sensitive sensor nodes and the capacitive sensors are disposed on separate non-overlapping portions of a sensor substrate of the pressure sensitive sensor assembly.

14. A method as described in claim 11, wherein the capacitive sensors are part of a capacitive sensor assembly that is disposed over the pressure sensitive assembly as layers that are proximal to each other.

15. A method as described in claim 10, wherein the functionality includes placing a backlight of the input device in the operational state to illuminate one or more indications of inputs of the input device.

16. A method as described in claim 10, wherein the input device includes a keyboard.

17. A system comprising:
a capacitive sensor array embedded on a sensor substrate configured to detect proximity of an object; and
a plurality of pressure sensitive sensor nodes configured to be:
embedded as nodes interspersed within the capacitive sensor array;
placed in a non-operational state prior to a detection of the object by the capacitive sensor array; and
placed in an operational state responsive to the detection of the object by the capacitive sensor array.

18. A system as described in claim 17, wherein the plurality of pressure sensitive sensor nodes are configured to detect pressure using a force sensitive ink.

19. A system as described in claim 17, wherein responsive to the detection of the object by the capacitive sensor array, enabling the pressure sensitive sensor nodes to perform detections of varying amounts of applied pressure.

20. A system as described in claim 17, wherein the pressure sensitive sensor nodes are placed in an inoperative state when the capacitive sensor array no longer detects the object.