Patent Publication Number: US-2022214725-A1

Title: Posture probabilities for hinged touch display

Description:
BACKGROUND 
     Computing devices may couple a pair of touch-sensitive displays around a hinge. This configuration allows for myriad display poses and postures. A user may use the device as a single, flat-panel display, a partially-folded book-style device, or fully folded with a displays facing in opposite directions. Each display may be oriented in landscape or portrait mode individually or as a pair, allowing for customized display options for different applications. 
     SUMMARY 
     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 to limit the scope of the claimed subject matter. Furthermore, the claimed subject matter is not limited to implementations that solve any or all disadvantages noted in any part of this disclosure. 
     A computing device includes a hinge rotatably coupling a first leaf including a touch display and a second leaf. A hinge angle sensor measures a hinge angle between the first leaf and the second leaf. An inertial measurement unit measures an orientation of one or both of the leaves. A first touch heat map is received from the touch display. Based on the touch heat map, hinge angle, and orientation, a posture probability is generated indicating a likelihood that the first touch display is in a candidate display posture, and an active probability is generated indicating a likelihood that the first touch display is an active display. One or more display characteristics of the first touch display are adjusted based on the posture probability and the active probability. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  shows an example computing device with dual displays in a flat configuration with a hinge angle of 180°. 
         FIG. 1B  shows the computing device of  FIG. 1  in a folded pose with a hinge angle of 45°. 
         FIG. 1C  shows the computing device of  FIG. 1  in a back-to-back pose with a hinge angle of 360°. 
         FIG. 1D  shows the computing device of  FIG. 1  in a closed pose with a hinge angle of 0°. 
         FIG. 1E  shows the computing device of  FIG. 1  in a tent pose with a hinge angle of 270°. 
         FIG. 2  is a bottom view of the computing device of  FIG. 1 , showing two configurations of a hinge angle sensor. 
         FIG. 3  is a schematic view illustrating software and hardware components of the computing device of  FIG. 1 . 
         FIG. 4  is a method for adjusting display characteristics of a computing device. 
         FIGS. 5A-5C  schematically illustrate heat maps for a user holding a computing device in a variety of postures. 
         FIGS. 6A-6B  illustrate gestures performed by a user holding a computing device. 
         FIGS. 7A-7C  illustrate thermal management for a computing device in a variety of postures. 
         FIG. 8  is a schematic view of a system for determining posture probabilities and active display probabilities for a computing device. 
         FIG. 9  shows an example computing system according to an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Foldable computing devices may include a pair of leaves rotatably coupled around a hinge. This allows for the device to adopt numerous conformations, enabling the user to select from a plurality of options as to how the device is employed. Each leaf may include a portion of the computing device, such as a display screen, touch display screen, keyboard, trackpad, and/or other display componentry, processing componentry, communication componentry, and/or input componentry. 
     When each of the two leaves include a display, the two displays may combine to form a single, larger touch display. The device may be partially folded into a pose resembling a book or tent. The device may be completely folded into a compact pose where only one display is active. Even if one of the two displays is not presenting content, the touch sensors for the inactive display may remain active, allowing for additional user inputs and controls. 
     The computing device may thus behave differently in different postures. However, this functionality depends on the computing device being able to discern which pose or posture the device is in, effectively mimicking the ability to discern the user&#39;s intent for how the device is to be used. The device may have to determine whether each of the screens are activated, the orientation of the display (or combined display), and how to configure inputs and display objects to match the device posture. Depending on which sensors are being used to determine posture, there may be some ambiguity as to how the user presently wants to deploy the computing device. The user&#39;s preference may vary across applications. 
     To address these issues, as shown in  FIGS. 1A-E , a computing device  100  in accordance with one example embodiment of the present disclosure is disclosed. The computing device  100  comprises a first leaf  106 A and a second leaf  106 B. In this example, first leaf  106 A includes a first touch display  112 A having first display surface  114 A, and a first capacitive touch sensor  116 A. Second leaf  106 B comprises a second touch display  112 B having a second display surface  114 B and a second capacitive touch sensor  116 B. The first and second touch displays  112 A,  112 B are rotatably coupled via a hinge  118 , that may be positioned at various hinge angles θ, allowing for relative rotational movement of first touch display  112 A and second touch display  112 B. The first touch display  112 A and the second touch display  112 B are separated by the hinge angle. The hinge angle is defined as an angle between the first display surface  114 A and the second display surface  114 B. In the illustrated example, the hinge  118  is rotatable such that the hinge angle may have any value between 0° and 360°. 
     Although this disclosure is primarily described in the context of hinged computing devices having two rotatably coupled touch displays, many of the systems and methods presented herein are equally applicable to hinged computing devices having rotatably coupled leaves where one of the leaves is a touch display and the second leaf is a non-touch display, a keyboard, a trackpad, or other suitable component for displaying information, receiving user input, or otherwise interacting with the first leaf and/or providing other computing functionality. Each pair of leaves may include two identical sub-devices or may be asymmetric. When two similar sub-devices are included (e.g., two touch displays), the internal hardware may be divided asymmetrically, e.g., so as to avoid redundancy. 
     The respective display surfaces  114 A,  114 B are configured to display images, which may be formed independently of one another or in combination as a combined logical display, as will be described in detail below. While the first and second capacitive touch sensors  116 A,  116 B are illustrated in a capacitive grid configuration, it will be appreciated that other types of touch sensors and configurations may also be used, such as, for example, a capacitive diamond configuration. The capacitive touch sensors are typically at least partially transparent, being manufactured, for example, of indium tin oxide (ITO). The first and second capacitive touch sensors  116 A,  116 B are configured to detect a touch input caused by a change in capacitance between driven electrodes and read electrodes in the grid resulting from objects on or near the touch displays  112 A,  112 B, such as a user&#39;s finger, hand, stylus, etc. Touch sensing technologies that do not utilize capacitance are also compatible with this disclosure. 
       FIGS. 1A-1E  illustrate the computing device  100  in various poses.  FIG. 1A  illustrates the computing device  100  in a flat, or open pose, with the hinge angle at 180 degrees.  FIG. 1B  illustrates the computing device  100  in a folded pose with the hinge angle at 45 degrees.  FIG. 1C  illustrates the computing device  100  in a back-to-back pose, with a hinge angle of 360 degrees.  FIG. 1D  illustrates the computing device  100  in a face-to-face pose, with a hinge angle of 0 degrees.  FIG. 1E  illustrates the computing device  100  in a tent pose, with a hinge angle of 270 degrees. For each pose, computing device  100  may be held in a plurality of orientations relative to gravity. This combination of hinge angle (pose) and device orientation relative to gravity is referred to herein as a posture of computing device  100 . While this disclosure uses computing device  100  as an example, other hinged computing devices with differently-sized displays, three or more displays, panels with displays on both the front and back sides, different types of hinges, hinges with different ranges of motion, different touch detection technologies, and/or other differences relative to computing device  100  are also compatible with this disclosure. 
     Turning now to  FIG. 2 , computing device  100  further includes one or more sensors  119  configured to detect the orientation of leaves  106 A and  106 B, and thus of the first and second touch displays  112 A and  112 B, in three-dimensions, and to detect the hinge angle between the first and second display surfaces  114 A,  114 B of the first and second touch displays  112 A,  112 B. As a nonlimiting example, the hinge angle sensor  119 A may be a potentiometer (or variable resistor) positioned in the hinge  118  and configured to measure the angle of the hinge  118 . In the illustrated embodiment, the hinge  118  is a double hinge and a hinge angle sensor  119 A is provided in each hinge. By reading the measured value of each hinge angle sensor  119 A, a total value for the hinge angle θ may be computed. Alternatively, a single hinge with a single potentiometer may be utilized. 
     In addition to or as an alternative to the one or more hinge angle sensors  119 A, one or a pair of inertial measurement units (IMUs)  119 B may be provided within sensors  119 . In the depicted embodiment, a respective IMU  119 B is positioned in each of the first and second touch displays  112 A,  112 B. Each IMU is configured to produce a respective six degree of freedom (6DOF) vector  119 B 1 ,  119 B 2  indicating its relative acceleration around three axes including a vertical axis that points toward the earth, as well as pitch, yaw, and roll. The hinge angle θ may be computed by subtracting the two 6DOF vectors. Instead of IMUs, other types of accelerometers or gyroscopes could be utilized to obtain similar measurements and compute the hinge angle. As yet another alternative, in addition or alternatively to the hinge angle sensor  119 A and IMUs  119 B, a depth camera  119 C may be positioned in one of the first and second touch displays  112 A,  112 B and configured to measure a depth  119 C 1  to the opposite display device as an example. This depth  119 C 1  could be used to determine a hinge angle of the computing device  100  for values less than 90 degrees, for example. In other poses and postures, depth camera  119 C may be used to determine a distance to a nearest surface other than a touch display, for example to a user. 
     Sensors  119  may further include one or more of compasses, visible light cameras (optionally coupled to facial recognition software), infrared cameras, ultraviolet light camera, Hall effect sensors, proximity sensors, temperature sensors, edge floating capacitance and/or resistance sensors, peripheral squeeze sensors, and/or other suitable sensors. 
     Turning to  FIG. 3 , a nonlimiting software and hardware architecture of the computing device  100  is illustrated in schematic view. Processor  101  is illustrated as being connected via a bus  105  to a volatile memory  103 A, non-volatile memory  103 B, sensors  119 , first touch display  112 A, and second touch display  112 B. Programs (e.g., program  144 ) stored in non-volatile memory  103 B are executed by the processor  101  using portions of volatile memory  103 A. 
       FIG. 3  generally illustrates a loop between detection of touch inputs and output of graphical elements for display. Beginning with the detection of touch inputs, during operation each of the first and second capacitive touch sensors  116 A,  116 B of the first and second touch displays  112 A,  112 B are configured to continuously output their capacitances in the form of heat maps (i.e., capacitive grid maps)  120  to an associated touch handler  122 A,  122 B for each touch display  112 A,  112 B. The touch handlers  122 A,  122 B optionally pass the heat maps  120  to a touch sensor calibration module  124  of a touch processing pipeline  126 , which performs on the fly, i.e., real-time, touch sensor calibration by applying calibration maps  128  to the heat maps  120 , to thereby produce calibrated capacitance maps. The calibrated capacitance map optionally is passed to a blob detection module  130 , which determines the areas of the capacitive touch sensor  116 A,  116 B that are touched, after ignoring, i.e., rejecting, areas such as palms or forearms, which are not deemed part of the user&#39;s intended touch. The blob detection module  130  may be configured to detect and distinguish between touch and hover inputs. To achieve this, the blob detection module  130  may be configured to apply a first predetermined touch capacitance difference threshold to the adjusted capacitance map to discern where the display is being touched, and a second predetermined hover capacitance difference threshold, which is lower than the first predetermined touch capacitance difference threshold, to detect hover of a user&#39;s digit. In a typical application, a centroid of each blob detected by the blob detection module  130  is passed to a touch input tracker  132 . 
     The touch input tracker  132  is configured to track various touches over time using tracking algorithms that take into account the size, position, and motion of each blob, and organize them into one or more touch inputs  134 . On a multitouch display, for example, a first touch input  140  might be recognized as a series of contacts detected as a left index finger slides across the display and a second touch input  142  might be recognized as a series of contacts detected from a right index finger sliding across the display concurrently. A touch input typically begins with a digit down event when a blob is initially detected and ends with a digit up event when the tracked blob is detected as no longer being in contact. As will be described in detail below, the touch input tracker  132  processes the touch inputs differently depending on the detected hinge angle indicating the configuration of the first and second touch displays  112 A,  112 B. For example, when the hinge angle of the computing device  100  is around 180 degrees, a touch that extends across the hinge from the first to the second display device or from the second to the first display device is processed as a combined touch input  136 , while in other modes such as tent mode, the touch inputs  134  from each capacitive touch sensor  116 A,  116 B are processed as independent touch inputs  138 , such that the first touch input  140  and second touch input  142  are separately considered by the touch input tracker  132 . 
     Heat maps  120  includes capacitance values for each touch-sensing pixel or capacitive grid point of each capacitive touch sensor matrix. Each heat map  120  is provided to the operating system directly from capacitive touch sensors  116 A and  116 B (e.g., without firmware first distilling the raw touch data into touch points). Touch handlers  122 A and  122 B may be configured to output heat map  120  based on capacitance measurements taken across capacitive touch sensors  116 A and  116 B. The digitizer may represent the capacitance of each point of the touch sensor matrix with a binary number having a selected bit depth. 
     Depending on the touch-sensing capabilities of the computing system hardware, touch processing pipeline  126  may receive one or more of the heat maps  120 . The touch processing pipeline  126  may be configured to communicate the heat map(s)  120  to other OS components and/or programs  144 , process the raw heat map(s)  120  for downstream consumption, and/or log the heat map(s)  120  for subsequent use. The heat map(s)  120  received by touch processing pipeline  126  provide a full complement of capacitance values measured by the capacitive sensors. 
     The heat map(s)  120  may include a capacitance value for each touch-sensing pixel or capacitive grid point of each capacitive touch sensor matrix of capacitive touch sensors  116 A and  116 B. In some examples, capacitance values for the entirety of the capacitive touch sensor may be provided to touch processing pipeline  126 . In other examples, the included capacitance values may be thresholded, and capacitance values outside of such thresholds may be omitted from the heat map. The plurality of capacitance values representing detected touch input may collectively indicate a touch profile of touch input to the capacitive touch sensor. 
     Each heat map  120  thus presents a view of what is actually touching the display, rather than distilled individual touch points. The data for heat map  120  may be provided to touch processing pipeline  126  in a well-defined format; for example, the resolution, bit depth, data structure, and any compression may be consistently implemented so that touch processing pipeline  126  is able to unambiguously interpret received heat maps  120 . Heat maps  120  may thus provide an indication of how a user is holding computing device  100 . Heat maps  120  may only be updated periodically, such as when there is a threshold change in one or more detected blobs, be it a change in size, location, and/or force. 
     A model may be trained based on large sets of heat map training data, wherein each pixel or other touch sensing location is labeled (e.g., via a human annotator) to indicate what is causing that touch measurement (e.g., right index finger, left index finger, right middle finger, palm, etc.). The trained model may then receive new heat maps during use and output a likelihood that each pixel is being touched by each different possible body part. Model training may occur via machine learning, neural networks, etc. but the present disclosure is compatible with other model training and retraining techniques, such as heuristics, metaheuristics, matheuristics, recursion, etc. 
     When presented with a heat map, such a model, or a separate model, may output a likelihood of a user grip or contact pattern based on the heat map training data. Herein, it may be stated that a heat map input into a model or decision “indicates” that a computing device is likely to be held in a specific grip or contact pattern. Such heuristics, previously-trained machine learning models, and/or other suitable techniques may be used to generate, evaluate, assess, or otherwise vet those indications. 
     Processor  101  may be configured to execute a display mode selection module  156 , which is configured to detect certain predetermined conditions  158  for selecting active displays. The conditions  158  may include that the hinge angle is within a certain range, as discussed below. Upon detecting the conditions for a particular display mode, the display mode selection module  156  is configured to select an appropriate display mode, as described in detail below. 
     Touch inputs  134  from the touch input tracker  132  and/or heat maps  120  may be passed to a program  144  executed by processor  101 . The program  144  may be an application program, an operating system component, utility or driver program, etc. The program  144  contains program logic that processes the touch inputs  134  and generates appropriate graphical elements  146  for display. The graphical elements  146  are sent from the program  144  to a rendering pipeline  148  of the operating system of the computing device  100 . The rendering pipeline  148  prepares the graphical elements for display on one or more of the first and second touch displays  112 A,  112 B. At any given time, depending on the hinge angle and vertical orientation of the computing device  100 , along with pertinent information derived from heat maps  120 , a suitable logical display mode is selected. The logical display mode may indicate, for example, that, as shown at  150 A, only the first touch display  112 A is active, or, as shown at  150 B, only the second touch display  112 B is active, and the graphical elements  146  should displayed on one or the other, whichever is active. The logical display mode may alternatively indicate that the graphical elements should be displayed on both display devices, referred to as display mirroring, such as shown at 150 C. Finally, when a hinge angle is detected as being within a suitable range, a combined display mode  150  may be selected that extends the first and second touch display  112 A,  112 B into a single logical display. The combined display mode  150  may be oriented vertically or horizontally (so called picture or landscape) as illustrated at  150 D and  150 E. 
     Many device postures look alike from the internal perspective of the computing device. Solely using the hinge sensor and movement sensors (e.g., accelerometers, gyrometers, magnetometers) as the primary determinants of posture can lead to incorrect conclusions and result in an annoyed user. With a finite number of sensors and a mechanically complex device, the internal sensor suite has a limited number of degrees of accuracy in determining device posture. This may lead to guessing as to what the user intent is, which touch screen(s) they want to be active, and how they would like the display content to be oriented. 
     In particular, movement between postures is often misinterpreted through ambiguous signals. A user holding the computing device in a folded pose akin to a paperback book may switch from lying on their stomach to lying on their back, changing the orientation of the device but not desiring to change the display layout. A user may flip the device around itself while in a back-to-back pose. Similar flip motions may result in the first touch screen facing the user or the second touch screen facing the user. Further, similar motions may be incurred by the user showing the active display screen to another individual. 
     To disambiguate these poses and postures, touch heat maps generated while the user is holding the device may be used to inform the device posture, to more accurately determine whether each display is active, and how content is presented on each display. This improved detection may allow for a more pleasing user experience that may evolve as the user interacts with the device and with specific applications. 
       FIG. 4  shows a computer-implemented method  400  for adjusting the display characteristics of a hinged, multi-leaf device, such as computing device  100 , according to an embodiment of the present disclosure. Method  400  may be performed at a processor of the hinged, multi-leaf device, as an example. Additionally or alternatively, aspects of method  400  may be performed by one or more computing devices communicatively coupled to the hinged, multi-leaf device. While primarily described in the context of a multi-leaf device having multiple touch displays, method  400  is additionally or alternatively applicable to multi-screen devices where at least one display is a touch display and one or more displays) is not a touch display, and/or to multi-leaf devices that include one or more leaves that do not include displays, such as keyboards, trackpads, drum machines, other input devices, etc. 
     At  410 , method  400  includes receiving a first touch heat map from a first touch display. Continuing at  420 , method  400  optionally includes receiving a second touch heat map from a second touch display or any other leaf configured to receive and process touch input. In examples where the second display is a non-touch display or other device that does not sense touch input, only a first touch heat map may be received. As described with regards to  FIG. 3 , each heat map may be based on capacitive touch sensors within each touch display, and may indicate the location, size, and force of each point of contact and near contact on each touch display. In practice, such touch heat maps may be periodically received in a series, and the series of touch heat maps may collectively indicate how touch input is changing over time. As such, it is to be understood that method  400  may be continuously executed to account for changes in the manner the touch displays are being used over time. 
     At  430 , method  400  includes receiving a hinge angle from the hinge angle sensor. In some examples, the hinge angle may be a raw output from the hinge angle sensor, such as a potentiometer output. Additionally or alternatively, the hinge angle may be processed to provide an angular reading between 0 and 360 degrees, inclusive. In some implementations, at  430 , method  400  may consider inputs from two or more different time periods (e.g., from two or more consecutive hinge angle assessments). 
     At  440 , method  400  includes receiving an orientation from the IMU. As described with regard to  FIG. 3 , the orientation may be based on signals received for each touch display, non-touch display, or other leaf from one or more inertial measurement units (IMUs) including accelerometers, gyrometers, magnetometers, etc., one or more cameras, and/or other orientation discerning sensors. Each orientation may be expressed as an absolute orientation within a suitable frame of reference (e.g., an orientation vector relative to gravity) and/or may be expressed as a relative orientation based on one or more previous orientations. In some implementations, at  440 , method  400  may consider inputs from two or more different time periods (e.g., from two or more consecutive orientation assessments). 
     At  450 , method  400  includes, based at least on the received first touch heat map, hinge angle, and orientation, generating a posture probability indicating a likelihood that the first touch display is in a candidate display posture. In examples where the second leaf includes a display, posture probabilities may be generated for candidate display postures for each display individually and/or as a combined unit. In some examples, a plurality of candidate postures may be evaluated, and posture probabilities generated for each of the plurality of display postures. In some implementations, at  450 , method  400  may base the posture probabilities on inputs from two or more different time periods. In addition to and/or instead of heat maps, hinge angle, and orientation, other inputs may be considered (e.g., inputs from cameras, user profiles, or other sources) when generating the posture probabilities. In examples wherein the second leaf includes a second touch display or other touch sensitive input device, the posture probability may be generated based on touch heat maps received from the second leaf. 
     Continuing at  460 , method  400  includes, based at least on the received first touch heat map, hinge angle, and orientation (e.g., for one or more time periods), generate active probabilities indicating a likelihood that the first touch display is an active touch display. In examples wherein the second leaf includes a second display, an active probability may be generated for the second display. In some implementations, at  460 , method  400  may base the active probabilities on inputs from two or more different time periods. In addition to and/or instead of heat maps, hinge angle, and orientation, other inputs may be considered (e.g., inputs from cameras, user profiles, or other sources) when generating the active probabilities. In examples wherein the second leaf includes a second touch display or other touch sensitive input device, the active probabilities may be generated based on touch heat maps received from the second leaf. 
     At  470 , method  400  includes adjusting one or more display characteristics of the first touch display and/or a second display based on one or more of the posture probabilities and one or more of the active probabilities. In some examples, the display characteristics adjusted in this manner include an on/off state of each touch and non-touch display, (e.g., “active” status). As such, for multi-display devices, either display or both displays may be turned on or off. In some examples, such as when the computing device is in a back-to-back pose, a touch display facing away from the user may allow user input controls via one or more user input zones even if the display portion of the display itself is turned off. As such, an “inactive” touch display may still retain some functionality. 
     In some examples, display characteristics include an orientation of content displayed by each display. In other words, the display may be rotated between a landscape orientation and a portrait orientation, may rotate 180 degrees responsive to the device being rotated 180 degrees, may adjust from a portrait orientation across two displays to a landscape orientation across one display responsive to the device being folded at the hinge, from a landscape orientation across two displays to a portrait orientation across one display responsive to the device being folded at the hinge, etc. Orientation on the different displays may be adjusted independently. 
     Some examples of postures derived from heat maps, hinge angles, and orientations are illustrated in  FIGS. 5A-5C . Computing device  500  includes a first leaf including first touch display  502  and a second leaf including second touch display  504 . First touch display  502  and second touch display  504  are rotatably coupled by hinge  506 . Computing device  500  may be considered a simplified example of computing device  100 . Heat maps for a visible touch display are shown as darkened blobs, while heat maps for a hidden touch display are shown as dashed outlines. 
       FIG. 5A  illustrates examples of computing device  500  in a back-to-back pose. At  510 , computing device  500  is shown with hinge  506  facing to the right. First heat map  512  indicates that both the thumb and fingers are contacting first touch display  502 , while second heat map  514  indicates that the user&#39;s palm is contacting second touch display  504 . From the device pose and heat maps, it may be deduced that computing device  500  is being held in a left-hand wraparound grip, with fingers wrapped around hinge  506 . As such, first touch display  502  is likely to be active, second touch display  504  is likely to be inactive, and first touch display  502  is likely to be in a portrait orientation. 
     At  520 , computing device  500  is shown with hinge  506  facing to the left (e.g., rotated 180 degrees around the z-axis from the posture shown at  510 ). First heat map  522  indicates that the user&#39;s thumb is contacting the lower left corner of first touch display  502 , while second heat map  524  indicates that the user&#39;s knuckle and forefinger are contacting second touch display  504 . From the device pose and heat maps, it may be deduced that computing device  500  is being held in a left-hand pinch grip, with the thumb and forefinger wrapped around hinge  506 . As such, first touch display  502  is likely to be active, second touch display  504  is likely to be inactive, and first touch display  502  is likely to be in a portrait orientation. 
     At  530 , computing device  500  is shown with hinge  506  facing to the right. First heat map  532  indicates that both the thumb and fingers are contacting first touch display  502 , while second heat map  534  indicates that the user&#39;s palm contacting second touch display  504 . From the device pose and heat maps, it may be deduced that computing device  500  is being held in a right-hand wraparound grip, with thumb right thumb wrapped around hinge  506 . The thumb and finger placement in first heat map  532  distinguishes the right-handed posture shown at  530  from the left-handed posture shown at  510 . As such, first touch display  502  is likely to be active, second touch display  504  is likely to be inactive, and first touch display  502  is likely to be in a portrait orientation. 
     At  540 , computing device  500  is shown with hinge  506  facing to the left (e.g., rotated 180 degrees around the z-axis from the posture shown at  530 ). First heat map  542  indicates that the user&#39;s thumb is contacting the lower right corner of first touch display  502 , while second heat map  544  indicates that the user&#39;s knuckle and forefinger are contacting second touch display  504 . From the device pose and heat maps, it may be deduced that computing device  500  is being held in a right-hand pinch grip, with the thumb and forefinger opposite hinge  506 . The right corner grip distinguishes the posture from that shown at  520 . As such, first touch display  502  is likely to be active, second touch display  504  is likely to be inactive, and first touch display  502  is likely to be in a portrait orientation. 
       FIG. 5B  illustrates examples of computing device  500  in a tent pose with hinge  506  facing up. At  550 , first heat map  552  indicates that the user&#39;s thumb is contacting the left side of first touch display  502 , while second heat map  554  indicates that the user&#39;s middle, ring, and pinky fingers are contacting the left side of second touch display  504 . From the hinge angle, it may be deduced that the user&#39;s index finger is likely to be positioned in between first touch display  502  and second touch display  504 . From the device pose, hinge angle, and heat maps, it may be deduced that computing device  500  is likely to be held in a left-hand grip, with the forefinger under hinge  506 . As such, first touch display  502  is likely to be active, second touch display  504  is likely to be inactive, and first touch display  502  is likely to be in a landscape orientation. 
     At  560 , first heat map  562  indicates that the user&#39;s thumb is contacting the right side of first touch display  502 , while second heat map  564  indicates that the user&#39;s middle, ring, and pinky fingers are contacting the right side of second touch display  504 . From the hinge angle, it may be deduced that the user&#39;s index finger is likely to be positioned in between first touch display  502  and second touch display  504 . From the device pose, hinge angle, and heat maps, it may be deduced that computing device  500  is likely to be held in a right-hand grip, with the forefinger under hinge  506 . As such, first touch display  502  is likely to be active, second touch display  504  is likely to be inactive, and first touch display  502  is likely to be in a landscape orientation. The heat map indicating the right-hand side grip distinguishes the posture at  560  from that at  550 . 
       FIG. 5C  illustrates examples of computing device  500  in an open pose. If the user is holding the computing device with both hands in such a pose, the movement sensors alone will not discern whether the touch displays should be configured in a landscape mode or portrait mode. At  570 , first heat map  572  is empty, and second heat map  574  indicates that the user&#39;s thumbs are contacting opposite sides of second touch display  504 . As such, both first touch display  502  and second touch display  504  are likely to be active, and the combined display is likely to be in a portrait orientation. In contrast, at  580 , first heat map  582  indicates that the user&#39;s left thumb is contacting first touch display  502 , while second heat map  584  indicates that the user&#39;s right thumb is contacting second touch display  504 . As such, both first touch display  502  and second touch display  504  are likely to be active, and the combined display is likely to be in a landscape orientation. 
     At  590 , first heat map  592  indicates that a portion of the user&#39;s thumb is contacting the bottom right corner of first touch display  502 , and a portion of the same thumb is contacting the bottom left corner of second touch display  504 . As such, both first touch display  502  and second touch display  504  are likely to be active, and the combined display is likely to be in a landscape orientation, with the user holding computing device  500  with a single-handed grip (e.g., paperback book posture). Using these heat maps, the angle range and orientation of the device, and thus the posture, may be deduced. If the user changes their orientation (e.g., from lying on their stomach to lying on their back), while the device orientation changes, the heat map will change minimally, and the display characteristics can be maintained. 
     In some examples, method  400  includes determining a display-usage gesture based at least on the received hinge angle and orientation, wherein generating active probabilities and/or posture probabilities is further based on the determined display-usage gesture. A display-usage gesture may include a conformation change, a configuration change, an orientation change, and/or movement between the first leaf and second leaf relative to each other and/or to a suitable frame of reference (e.g., gravity) that is of great enough magnitude to potentially trigger a change in active status for one or more displays, and/or a posture change that may result in a change in display characteristics for one or more displays. 
     Such display-usage gestures may be determined based on changes in hinge angle and device orientation as determined via multi-axis sensors (e.g., IMU signal output). However, using just these two inputs leads to ambiguous gestures where the computing device may easily make an incorrect decision as to touch display activity, orientation, or other display characteristics. By incorporating heat maps from the first touch display and, where applicable, a second touch display or other touch input device from prior to, during, and/or following the gesture, this ambiguity may be resolved. 
     As an example,  FIG. 6A  illustrates a fold gesture, wherein the hinge angle is increased from a threshold angle (e.g., open pose or folded pose, hinge angle ≤180 degrees) to within a threshold of a 360 degree angle and/or substantially a back-to-back pose (as shown, following rotation around the x-axis). At  600 , first heat map  602  indicates that the user&#39;s thumbs are contacting opposite sides of first touch display  502 , second heat map  604  is empty, and both touch displays are active. If the user performs a fold gesture, either first touch display  502  or second touch display  504  is going to be de-activated. While users may have learnable tendencies for this display-use gesture, such a tendency is not always indicative of what the user is expecting from the device at a specific incidence. 
     The touch display that is most likely to be the user&#39;s intended active display may be determined by heat maps indicating how the user is holding the device prior to, during, and/or after the gesture. If one of the touch displays outputs a heat map exhibiting substantial coverage of the display, it is likely that the user is holding that side of the device and look at the other touch display. 
     For example, at  610 , first heat map  612  indicates that the user&#39;s thumbs are contacting opposite sides of first touch display  502 , while second heat map  614  indicates that the fingers from both hands of the user are contacting the opposing sides of second touch display  504 . Thus, it is likely that the user is holding the computing device so that first touch display  502  is relatively unobstructed, and thus active. 
     At  620 , the opposite scenario is illustrated. First heat map  622  indicates that the fingers from both hands of the user are contacting the opposing sides of first touch display  502 , while second heat map  624  indicates that the user&#39;s thumbs are contacting opposite sides of second touch display  504 . Thus, it is likely that the user is holding the computing device so that second touch display  502  is relatively unobstructed, and thus active. 
     As another example,  FIG. 6B  illustrates a flip gesture, wherein the hinge angle is set to within a threshold of 360 degrees (substantially back-to-back pose), and wherein the computing device is rotated (e.g., 180 degrees around the y-axis) so that orientation of the first and second touch displays is switched relative to a suitable frame of reference (e.g., gravity). 
     At  630 , first heat map  632  indicates that the user&#39;s thumbs are contacting opposite sides of first touch display  502 , while second heat map  634  indicates that the fingers from both hands of the user are contacting the opposing sides of second touch display  504 . If the user is looking at something on first touch display  502  and wants to show it to another user, they would likely flip that touch display towards the other user while maintaining the same orientation. If the user merely wants to change the active touch display on the computing device because it is dirty, the orientation data for the gesture would be similar. If the user is just swiveling in a chair, from the IMU sensor point of view, the intended orientation may be ambiguous. 
     This disparity can be resolved by incorporating the heat maps into the probability determination. For example, at  640 , the orientation of computing device  500  has flipped 180 degrees around the y-axis, but first heat map  642  and second heat map  644  are substantially identical to first heat map  632  and second heat map  634 . This indicates that the most likely scenario is that the user has flipped computing device to present first touch display  502  to another individual. In contrast, at  650 , first heat map  652  indicates that the fingers from both hands of the user are contacting the opposing sides of first touch display  502 , and second heat map  654  indicates that the user&#39;s thumbs are contacting opposite sides of second touch display  504 . This indicates that the most likely scenario is that the user has flipped computing device  500  with the intention of viewing second touch display  504 . 
     Returning to  FIG. 4 , at  480 , method  400  optionally includes adjusting one or more performance characteristics of the logic machine based on the posture probabilities and the active probabilities. For example, performance characteristics may include power calibration, voltage scaling, frequency modulation, under/overclocking, processor throttling, core usage distribution, etc. Continuing at  490 , method  400  optionally includes adjusting one or more thermal performance characteristics of the computing device based on the posture probabilities and the active probabilities. 
     For example, the central processor or system-on-a-chip may reside within the first touch display. If that touch display is active, and the user is holding only the second leaf, the performance of the processor may be driven higher, and thus hotter, because the user&#39;s fingers will not directly experience the increased heat. If the computing device is in a tent pose and the user is determined to not be holding the computing device based on the heat maps for the first and second touch displays, the processor may be run at maximum performance, and thus maximum heat, without regard for adversely exposing the user to uncomfortable heat. Likewise, a processor may be downthrottled to run cooler if the user&#39;s grip is determined to subject the user to heat from the processor. 
     In some examples, adjusting one or more thermal performance characteristics of the computing device includes adjusting the position of one or more heat dissipation zones within the computing device. In this way, heat generated by the processor may be dissipated away from the user&#39;s hands. 
     Some examples of heat dissipation zones positioned based on heat maps, hinge angles, and orientations are illustrated in  FIGS. 7A-7C .  FIG. 7A  illustrates examples of computing device  500  in a back-to-back pose. At  700 , computing device  500  is shown with hinge  506  facing to the right. First heat map  702  indicates that both the thumb and fingers are contacting first touch display  502 , while second heat map  704  indicates that the user&#39;s palm is contacting second touch display  504 . From the device pose and heat maps, it may be deduced that computing device  500  is being held in a left-hand wraparound grip, with fingers wrapped around hinge  506 . Accordingly, heat dissipation zone  706  may be positioned so that heat dissipates from the upper left corner of the surface of first touch display  502 , opposite hinge  506 . In this way, heat dissipates away from the palm of the user in contact with second touch display  504  and away from the fingers and thumb at the edges of first touch display  502 . 
     At  710 , computing device  500  is shown with hinge  506  facing to the left. First heat map  712  indicates that the user&#39;s palm is contacting first touch display  502 , while second heat map  704  indicates that both the thumb and fingers are contacting second touch display  504 . From the device pose and heat maps, it may be deduced that computing device  500  is being held in a left-hand wraparound grip, with the thumb wrapped around hinge  506 . Accordingly, heat dissipation zone  716  may be positioned so that heat dissipates from the upper left corner of the surface of second touch display  504 , near hinge  506 . In this way, heat dissipates away from the palm of the user in contact with first touch display  502  and away from the fingers and thumb at the edges of first touch display  502 . 
     At  720 , computing device  500  is shown with hinge  506  facing to the right. First heat map  722  indicates that both the thumb and fingers are contacting first touch display  502 , while second heat map  724  indicates that the user&#39;s palm is contacting second touch display  504 . From the device pose and heat maps, it may be deduced that computing device  500  is being held in a right-hand wraparound grip, with the thumb wrapped around hinge  506 . Accordingly, heat dissipation zone  726  may be positioned so that heat dissipates from the upper right corner of the surface of first touch display  502 , near hinge  506 . 
     At  730 , computing device  500  is shown with hinge  506  facing to the left. First heat map  732  indicates that the user&#39;s palm is contacting first touch display  502 , while second heat map  734  indicates that both the thumb and fingers are contacting second touch display  504 . From the device pose and heat maps, it may be deduced that computing device  500  is being held in a right-hand wraparound grip, with the fingers wrapped around hinge  506 . Accordingly, heat dissipation zone  736  may be positioned so that heat dissipates from the upper right corner of the surface of second touch display  504 , opposite hinge  506 . 
       FIG. 7B  illustrates examples of computing device  500  in a tent pose with hinge  506  facing up. At  740 , first heat map  742  indicates that the user&#39;s thumb is contacting the left side of first touch display  502 , while second heat map  744  indicates that the user&#39;s middle, ring, and pinky fingers are contacting the left side of second touch display  504 . From the device pose, hinge angle, and heat maps, it may be deduced that computing device  500  is likely to be held in a left-hand grip, with the forefinger under hinge  506 . Accordingly, heat dissipation zone  746  may be positioned so that heat dissipates from the right-hand side of the surface of first touch display  502 . 
     At  750 , first heat map  752  indicates that the user&#39;s thumb is contacting the right side of first touch display  502 , while second heat map  754  indicates that the user&#39;s middle, ring, and pinky fingers are contacting the right side of second touch display  504 . From the device pose, hinge angle, and heat maps, it may be deduced that computing device  500  is likely to be held in a right-hand grip, with the forefinger under hinge  506 . Accordingly, heat dissipation zone  756  may be positioned so that heat dissipates from the left-hand side of the surface of first touch display  502 . 
       FIG. 7C  illustrates examples of computing device  500  in an open pose. At  760 , first heat map  762  indicates that the user&#39;s thumb is contacting the left-hand side of first touch display  502 , and second heat map  764  is empty. As such, it may be deduced that the user is holding computing device  500  with the left-hand. Accordingly, heat dissipation zones  766  and  768  may be positioned on the right-hand sides of first touch display  502  and second touch display  504 , respectively. 
     At  770 , first heat map  772  indicates that the user&#39;s thumb is contacting the right-hand side of first touch display  502 , and second heat map  774  is empty. As such, it may be deduced that the user is holding computing device  500  with the right-hand. Accordingly, heat dissipation zones  776  and  778  may be positioned on the left-hand sides of first touch display  502  and second touch display  504 , respectively. 
     In some examples, the display characteristics include display positions of display objects on each touch and/or non-touch display. For example, objects may be repositioned on one touch display to avoid being obscured by a user&#39;s finger as determined by one or more heat map. 
     Additionally or alternatively, display characteristics may include positions of user input zones on each touch display. In this context, user input zones may refer to portions of either touch display that are designated for specific user input, such as buttons, icons, keyboards, other touch sensitive commands and controls, etc. As described herein, user input zones may be located on an otherwise inactive touch display, and thus may not be accompanied by a graphic representation on a display. Rather, the user input zone may include a portion of a capacitive touch sensor that triggers a specific response responsive to touch input. As an example, if the computing device is in an open pose, where both touch displays are active, a keyboard may be centered on one display or the other, based at least on the heat maps, and in some examples, based on user handedness or other preferences. If the computing device is in a back-to-back pose being held with one hand, such as shown at  520  in  FIG. 5A , certain user input zones may be positioned towards the thumb of the user for easy access, while other user input zones may be positioned away from the thumb of the user, to facilitate touch input with the opposite hand. 
     In these, and other examples, the active probabilities and the posture probabilities may be further based on device usage parameters and/or further based on stored user parameters indicating a handedness of the user. These examples are described further herein and with regard to  FIG. 8 . 
       FIG. 8  schematically shows an example system  800  that may be used to generate active probabilities and posture probabilities for a hinged, multi-display computing device, such as computing device  100 . System  800  may further be used to set parameters for a computing device based on the generated probabilities. Additionally, system  800  may be used to both train and retrain a model for probability generation based on user habits over time. 
     System  800  comprises a decision engine  805  that operates a predictive model  807 . Decision engine  805  may output one or more probabilities  810 , such as active probabilities and posture probabilities, indicating a likelihood of a touch display device being active and a likelihood of each active touch display device or combined display device being in a particular orientation, as described herein. Model  807  may be configured to evaluate dynamic data based on at least static user data. Model  807  may employ one or more neural networks, such as recurrent neural networks or other neural networks configured to analyze sequential input data. Model  807  may employ a fusion of dynamic data with static data that has been learned from user behavior and user patterns in order to determine what is most likely to be happening at the device, akin to dynamically building a distributed neural network. 
     Decision engine  805  may receive dynamic data inputs from dynamic sensors  815 . Dynamic sensors  815  may include, but are not limited to, IMU  816 , hinge angle sensor  817 , and touch displays  818 . As described with regard to  FIG. 3 , dynamic sensors may further include a compass, cameras, time-of-flight sensors, hall and/or other proximity sensors, ambient light sensors, UV sensors, temperature sensors, edge capacitance/resistance sensors, etc. As an example, a capacitive touch input may be used to generate heat maps for the touch displays as described herein. In some examples, heat maps may only be updated when a significant change in the heat map occurs. Decision engine  805  may also receive dynamic input from active device parameters  820 , which may include active application parameters  822 . For example, active device parameters may include battery charge, brightness level, audio settings, network settings, etc., while active application parameters may include any settings or parameters for applications that are currently open and/or being used, particularly if the parameters for one application conflict or override device parameters or parameters for other applications. 
     In some examples, dynamic sensors  815  and active device parameters  820  may provide dynamic input to gesture recognition engine  825 . Gesture recognition engine  825  may be configured to evaluate output from dynamic sensors  815  in the context of active device parameters  820  to determine whether the user has performed one or more display-usage gestures, as described with regard to  FIG. 6 . If a display-usage gesture has been performed, gesture recognition engine may provide the nature of the display-usage gesture to decision engine  805 . 
     Decision engine  805  may receive static user data from user profile  830 . User profile  830  may include user preferences  832 , such as device preferences  833  and application preferences  834 . Device preferences  833  and application preferences  834  may include preferences set by the computing device, preferences actively indicated by the user, and/or preferences learned based on user activity over time. User profile  830  may further include historic data  835 , including handedness model  837  and heat map history  838 . 
     Handedness model  837  may indicate whether the user is predominantly right-handed or left-handed. This indication may be based on a user selected preference, learned tendencies for the user, heat maps, and/or a combination thereof. Handedness model  837  may model which hand(s) the user tends to use to hold the computing device in certain situations, and which hand(s) the users tends to use for input to the computing device in certain situations. 
     Generally, computing devices that use heat maps do so from the perspective of palm rejection or for improving touch input accuracy or stylus pen accuracy. However, handedness model  837  may extend the model of handedness beyond simple heat maps to include looking at the which of the touch displays are predominantly active in certain scenarios, irrespective of what the handedness guess is. For example, handedness model  837  may determine whether the user predominantly uses the right touch display or the left touch display as an input for determining active probabilities for whether each display screen is going to be active. Heat map history  838  may thus include context aware heat maps that indicate corresponding usage tendencies, for example, which app was being used, what the device posture was when the heat map was recorded, etc. In this way, a newly received heat map may be compared to stored heat maps from similar postures and use scenarios. 
     For example, a gaming app may employ predetermined joystick controls, irrespective of whether the user is left-handed or right-handed. In such an example, the user&#39;s heat map will be roughly identical whatever the user&#39;s handedness is. Conversely, a game with customizable joystick controls where the user can deliberately position user input zones may provide information that can be used to determine user handedness. Decision engine  805  may thus evolve along with model  807  as the user gains experience with the computing device, and as use cases for postures accumulate. Initially, decision engine  805  may provide equal weights to device preferences  833 , application preferences  834 , handedness model  837 , and heat map history  838  when evaluating dynamic sensor data. The output probabilities  810  may then be evaluated by posture engine  840  to determine device parameters. As more data is collected over time, the user profile entries may accumulate metadata indicating a time of day, a day of the week, a physical location, types of task, frequently used apps, etc. Cross-referencing these user preferences with handedness model  837 , heat map history  838 , device postures for an application, etc. allow for refining model  807  and for more accurately ascribing a probability. Over a larger data set, weights for each of the inputs may be generated based on the usage patterns to increase the reliability of model  807  through local refinement based on user profile  830 . 
     Probabilities  810  output by decision engine  805  may be provided to posture engine  840 . Posture engine  840  may evaluate probabilities  810  and output control signals that indicate parameters for the computing device, such as 1st touch display parameters  842 , 2nd touch display parameters  844  performance parameters  846 , and thermal parameters  848 . 
     Heat maps are complex data forms. As such, refining model  807  to adjust for handedness, hand size, and personal preference in holding the device may be a gradual process. This refinement of model  807  may be aided through the user of corrective signals  850 . Corrective signals  850  may include at least direct user correction and corrective user input errors. For example, system  800  may enable the user to correct an incorrect prediction for the active display (e.g., by double-tapping on the inactive display). Additionally, the user may make correctable errors if a user input zone is positioned non-ergonomically for the user&#39;s grip (e.g., the user makes typing errors that would be corrected if the input keyboard was shifted towards their right-hand). 
     Model  807  can then make use of the models and parameters it was comparing when the original determination was made, and the corrective signal may provide a label that indicates what determination should have been made. The model algorithms may thus be trained and retrained via machine learning to determine how a particular user prefers to hold the computing device and what the user expectation is in that particular case. Model  807  may provide a continuous refinement path to synchronize with what a particular user would like the computing device to behave. 
     For example, posture engine  840  may receive user feedback in the form of corrective signals  850 , indicating to change the active touch display. Posture engine  840  may then adjust which of the first and second display devices is active. Device preferences  833  may be updated based on the user feedback. Future active display probabilities may be adjusted via model  807  based on the updated device preferences. 
     Computing device  800  may be coupled to one or more cloud computing devices  860 . Cloud computing device  860  may be used to store user profiles  862  and model parameters  864  for a plurality of users. User profile  830  and/or model  807  may be periodically stored in at cloud computing device  860  and may follow the user if the user moves from one computing device to another one. If the new computing device is not identical to the original computing device where model  807  was trained, additional retraining may be necessary to correct for differences. Corrective signals and other retraining inputs may also be sent to the cloud, and in some examples, may retrain model  807  at cloud computing device  860 . The retraining may be based on user profiles  862  and model parameters  864  received for multiple users. A retrained version of model  807  may then be downloaded for use at decision engine  805 . 
     In some embodiments, the methods and processes described herein may be tied to a computing system of one or more computing devices. In particular, such methods and processes may be implemented as a computer-application program or service, an application-programming interface (API), a library, and/or other computer-program product. 
       FIG. 9  schematically shows a non-limiting embodiment of a computing system  900  that can enact one or more of the methods and processes described above. Computing system  900  is shown in simplified form. Computing system  900  may take the form of one or more personal computers, server computers, tablet computers, home-entertainment computers, network computing devices, gaming devices, mobile computing devices, mobile communication devices (e.g., smart phone), and/or other computing devices. 
     Computing system  900  includes a logic machine  910  and a storage machine  920 . Computing system  900  may optionally include a display subsystem  930 , input subsystem  940 , communication subsystem  950 , and/or other components not shown in  FIG. 9 . 
     Logic machine  910  includes one or more physical devices configured to execute instructions. For example, the logic machine may be configured to execute instructions that are part of one or more applications, services, programs, routines, libraries, objects, components, data structures, or other logical constructs. Such instructions may be implemented to perform a task, implement a data type, transform the state of one or more components, achieve a technical effect, or otherwise arrive at a desired result. 
     The logic machine may include one or more processors configured to execute software instructions. Additionally or alternatively, the logic machine may include one or more hardware or firmware logic machines configured to execute hardware or firmware instructions. Processors of the logic machine may be single-core or multi-core, and the instructions executed thereon may be configured for sequential, parallel, and/or distributed processing. Individual components of the logic machine optionally may be distributed among two or more separate devices, which may be remotely located and/or configured for coordinated processing. Aspects of the logic machine may be virtualized and executed by remotely accessible, networked computing devices configured in a cloud-computing configuration. 
     Storage machine  920  includes one or more physical devices configured to hold instructions executable by the logic machine to implement the methods and processes described herein. When such methods and processes are implemented, the state of storage machine  920  may be transformed—e.g., to hold different data. 
     Storage machine  920  may include removable and/or built-in devices. Storage machine  920  may include optical memory (e.g., CD, DVD, HD-DVD, Blu-Ray Disc, etc.), semiconductor memory (e.g., RAM, EPROM, EEPROM, etc.), and/or magnetic memory (e.g., hard-disk drive, floppy-disk drive, tape drive, MRAM, etc.), among others. Storage machine  920  may include volatile, nonvolatile, dynamic, static, read/write, read-only, random-access, sequential-access, location-addressable, file-addressable, and/or content-addressable devices. 
     It will be appreciated that storage machine  920  includes one or more physical devices. However, aspects of the instructions described herein alternatively may be propagated by a communication medium (e.g., an electromagnetic signal, an optical signal, etc.) that is not held by a physical device for a finite duration. 
     Aspects of logic machine  910  and storage machine  920  may be integrated together into one or more hardware-logic components. Such hardware-logic components may include field-programmable gate arrays (FPGAs), program- and application-specific integrated circuits (PASIC/ASICs), program- and application-specific standard products (PSSP/ASSPs), system-on-a-chip (SOC), and complex programmable logic devices (CPLDs), for example. 
     The terms “module,” “program,” and “engine” may be used to describe an aspect of computing system  900  implemented to perform a particular function. In some cases, a module, program, or engine may be instantiated via logic machine  910  executing instructions held by storage machine  920 . It will be understood that different modules, programs, and/or engines may be instantiated from the same application, service, code block, object, library, routine, API, function, etc. Likewise, the same module, program, and/or engine may be instantiated by different applications, services, code blocks, objects, routines, APIs, functions, etc. The terms “module,” “program,” and “engine” may encompass individual or groups of executable files, data files, libraries, drivers, scripts, database records, etc. 
     It will be appreciated that a “service”, as used herein, is an application program executable across multiple user sessions. A service may be available to one or more system components, programs, and/or other services. In some implementations, a service may run on one or more server-computing devices. 
     When included, display subsystem  930  may be used to present a visual representation of data held by storage machine  920 . This visual representation may take the form of a graphical user interface (GUI). As the herein described methods and processes change the data held by the storage machine, and thus transform the state of the storage machine, the state of display subsystem  930  may likewise be transformed to visually represent changes in the underlying data. Display subsystem  930  may include one or more display devices utilizing virtually any type of technology. Such display devices may be combined with logic machine  910  and/or storage machine  920  in a shared enclosure, or such display devices may be peripheral display devices. 
     When included, input subsystem  940  may comprise or interface with one or more user-input devices such as a keyboard, mouse, touch screen, or game controller. In some embodiments, the input subsystem may comprise or interface with selected natural user input (NUI) componentry. Such componentry may be integrated or peripheral, and the transduction and/or processing of input actions may be handled on- or off-board. Example NUI componentry may include a microphone for speech and/or voice recognition; an infrared, color, stereoscopic, and/or depth camera for machine vision and/or gesture recognition; a head tracker, eye tracker, accelerometer, and/or gyroscope for motion detection and/or intent recognition; as well as electric-field sensing componentry for assessing brain activity. 
     When included, communication subsystem  950  may be configured to communicatively couple computing system  900  with one or more other computing devices. Communication subsystem  950  may include wired and/or wireless communication devices compatible with one or more different communication protocols. As non-limiting examples, the communication subsystem may be configured for communication via a wireless telephone network, or a wired or wireless local- or wide-area network. In some embodiments, the communication subsystem may allow computing system  900  to send and/or receive messages to and/or from other devices via a network such as the Internet. 
     In one example, a computing device comprises a first leaf including a first touch display; a second leaf, a hinge rotatably coupling the first leaf and the second leaf, a hinge angle sensor to measure a hinge angle between the first leaf and the second leaf; an inertial measurement unit (IMU) to measure an orientation of one or both of the first leaf and the second leaf, and a storage machine holding instructions executable by a logic machine to: receive a first touch heat map from the first touch display; receive the hinge angle from the hinge angle sensor; receive the orientation from the IMU; based at least on the received first touch heat map, hinge angle, and orientation, generate a posture probability indicating a likelihood that the first touch display is in a candidate display posture; based at least on the received first touch heat map, hinge angle, and orientation, generate an active probability indicating a likelihood that the first touch display is an active display; and adjust one or more display characteristics of the first touch display based on the posture probability and the active probability. In such an example, or any other example, the display characteristics additionally or alternatively include an orientation of content displayed by the first touch display. In any of the preceding examples, or any other example, the display characteristics additionally or alternatively include display positions of display objects on the first touch display. In any of the preceding examples, or any other example, the display characteristics additionally or alternatively include positions of user input zones on the first touch display. In any of the preceding examples, or any other example, the display characteristics additionally or alternatively include an on/off state of the first touch display. In any of the preceding examples, or any other example, the storage machine additionally or alternatively holds instructions executable by the logic machine to: determine a display-usage gesture based at least on the received hinge angle and orientation, and wherein generating the active probability is additionally or alternatively based on the determined display-usage gesture. In any of the preceding examples, or any other example, the determined display-usage gesture is additionally or alternatively a flip gesture wherein the computing device is in a substantially back-to-back pose, and wherein the computing device is rotated so that an orientation of the first and second leaves is switched relative to gravity. In any of the preceding examples, or any other example, the determined display-usage gesture is additionally or alternatively a fold gesture, wherein a device pose is adjusted from a flat or folded pose to a back-to-back pose. In any of the preceding examples, or any other example, the active probability and the posture probability are additionally or alternatively based on a stored user parameter indicating a handedness of the user. 
     In any of the preceding examples, or any other example, the second leaf additionally or alternatively includes a second touch display, and wherein the storage machine additionally or alternatively holds instructions executable by a logic machine to; receive a second touch heat map from the second touch display; generate the posture probability based further at least on the second touch heat map; and generate the active probability based further at least on the second touch heat map. In any of the preceding examples, or any other example, the active probability and the posture probability are additionally or alternatively based on device preferences. In any of the preceding examples, or any other example, the storage machine additionally or alternatively holds instructions executable by the logic machine to: receive user feedback indicating to change the active touch display; adjust which of the first touch display and second touch display is active; update the device preferences based on the user feedback; and adjust how future active display probabilities are generated based on the updated device preferences. In any of the preceding examples, or any other example, the storage machine additionally or alternatively holds instructions executable by the logic machine to: adjust performance characteristics of the logic machine based on the active probability and the posture probability. In any of the preceding examples, or any other example, the storage machine additionally or alternatively holds instructions executable by the logic machine to: adjust thermal performance characteristics of the computing device based on the first touch heat map, the active probability, and the posture probability. 
     In another example, a computing device comprises a first leaf including a display; a second leaf; and a hinge rotatably coupling the first leaf and the second leaf; at least one processor; and a posture engine configured to: based at least on a relative posture of the first leaf and the second leaf, adjust performance characteristics of the processor. In such an example, or any other example, the display included in the first leaf is additionally or alternatively a first touch display configured to output a first touch heat map, the second leaf additionally or alternatively includes a second touch display configured to output a second touch heat map, and wherein the posture engine is additionally or alternatively further configured to: adjust performance characteristics of the processor based on the first and second touch heat maps. In any of the preceding examples, or any other example, the posture engine is additionally or alternatively configured to: based at least on the first and second touch heat maps for the first and second touch displays, adjust thermal performance characteristics of the processor. In any of the preceding examples, or any other example, adjusting thermal performance characteristics of the processor additionally or alternatively includes adjusting a position of one or more heat dissipation zones. In any of the preceding examples, or any other example, the posture engine is additionally or alternatively configured to: receive one or more posture probabilities indicating a likelihood that each touch display is in one of a plurality of display postures, the posture probabilities based on at least the first and second touch heat maps, a handedness model for a user, and a heat map history for the user. 
     In yet another example, a method for a hinged, multi-screen display comprises receiving a first touch heat map from a first touch display; receiving a second touch heat map from a second touch display rotatably coupled to the first touch display via a hinge; receiving a hinge angle indicative of an angle between the first touch display and the second touch display; receiving an orientation of one or more of the first touch display and the second touch display; based at least on the received first touch heat map, second touch heat map, hinge angle, and orientation, generating a posture probability indicating a likelihood that each of the first touch display and second touch display is in a candidate display posture; based at least on the received first touch heat map, second touch heat map, hinge angle, and orientation, generating active probabilities indicating a likelihood that each of the first touch display and the second touch display is an active touch display; and adjusting one or more display characteristics of the first and second touch displays based on the posture probability and the active probabilities. 
     It will be understood that the configurations and/or approaches described herein are exemplary in nature, and that these specific embodiments or examples are not to be considered in a limiting sense, because numerous variations are possible. The specific routines or methods described herein may represent one or more of any number of processing strategies. As such, various acts illustrated and/or described may be performed in the sequence illustrated and/or described, in other sequences, in parallel, or omitted. Likewise, the order of the above-described processes may be changed. 
     The subject matter of the present disclosure includes all novel and non-obvious combinations and sub-combinations of the various processes, systems and configurations, and other features, functions, acts, and/or properties disclosed herein, as well as any and all equivalents thereof.