Abstract: Method and apparatus are disclosed for interface verification for vehicle remote park-assist. An example vehicle system includes a mobile device and a vehicle autonomy unit. The mobile device includes a touchscreen and a controller. The controller is to present, via the touchscreen, an interface of a remote parking app and receive, via the touchscreen, an input responsive to the presentation of the interface. The vehicle autonomy unit receives an input signal from the mobile device and an input classifier coupled to the vehicle autonomy unit verifies the received input signal complies with an input classification.

Abstract: Aspects of the present disclosure are directed to creating and administering artificial reality collaborative working environments and providing interaction modes for them. An XR work system can provide and control such artificial reality collaborative working environments to enable, for example, A) links between real-world surfaces and XR surfaces; B) links between multiple real-world areas to XR areas with dedicated functionality; C) maintaining access, while inside the artificial reality working environment, to real-world work tools such as the user's computer screen and keyboard; D) various hand and controller modes for different interaction and collaboration modalities; E) use-based, multi-desk collaborative room configurations; and F) context-based auto population of users and content items into the artificial reality working environment.

Abstract: A voice activatable flight deck system including a voice recognition and processing system for receiving and processing input voice commands and determining machine commands for the voice activatable flight deck system. The system provides indications as to whether user interface functional elements are voice command enabled, disabled or whether voice command input is not available. The system provides directional feedback to the voice command depending on whether a pilot in command or second in command issued the voice input.

Abstract: An electronic device has an electrically adjustable shutter. The shutter may be placed in a transparent state or a nontransparent state. The shutter may overlap a portion of a display, may overlap a liquid contact indictor or a structure with text in a device, or may overlap an optical component such as an optical proximity sensor, ambient light sensor, visible light-emitting diode or laser, infrared light-emitting diode or laser, visible light image sensor, or infrared light image sensor. Control circuitry in the electronic device may place the shutter in an opaque state to hide an overlapped component from view or may place the shutter in a transparent state to allow the overlapped component to transmit or receive light. The adjustable shutter may exhibit changes in its transmission spectrum in different modes of operation and may be used as a camera filter or neutral density filter.

Abstract: Methods, systems, and techniques for keyboards for improving user keyboard input for the visually impaired are provided. Example embodiments provide a Doubletriple Keyboard System (“DKS”), which enables visually impaired users to type text by providing large or extra-large keys, and enhanced feedback mechanisms to assist in reducing user input errors. For example, the DKS provides specific sound and/or specific color for each key to assist the visually impaired when selecting a key.

Abstract: A method of making an actuator switch is disclosed. One method including: receiving a threshold amount of pressure on a top surface of a flexible film; in response to receiving the threshold amount of pressure, contacting a first electrode with a second electrode; in response to receiving the threshold amount of pressure, generating i) a first capacitive connection between a row electrode and the second electrode and ii) a second capacitive connection between a column electrode and the second electrode; in response to the first electrode contacting the second electrode, generating, by a piezoelectric actuator, haptic feedback; and in response to the generating the first capacitive connection and the second capacitive connection, providing an input detection signal.

Abstract: According to various embodiments, there is provided a user input device including: a chassis including a socket configured to releasably receive a panel; a memory storing a plurality of button maps, wherein each button map of the plurality of button maps defines functions of at least one button of a respective panel of a plurality of panels, each of which being receivable in the socket; and a processor configured to read an identity code of the received panel, and further configured to identify a matching button map from the plurality of button maps based on the identity code, wherein the matching button map defines the functions of the at least one button of the received panel.

Abstract: The disclosed system may include (1) a processor that generates an artificial environment that includes a virtual object, (2) a display that presents the artificial environment, (3) an input subsystem that detects tracks positioning of a body, and (4) a plurality of haptic actuators that are arranged to apply haptic feedback to a first plurality of locations on the body, where the processor (a) determines, based on the positioning of the body, a virtual contact of one of a second plurality of locations on the body with the virtual object, where the second plurality of locations is different from the first plurality of locations, and (b) activates, in response to the virtual contact, at least one of the plurality of haptic actuators based on a mapping of the second plurality of locations to the plurality of haptic actuators. Various other systems and methods are also disclosed.

Abstract: Electromechanical polymer (EMP) actuators are used to create haptic effects on a user interface deface, such as a keyboard. The keys of the keyboard may be embossed in a top layer to provide better key definition and to house the EMP actuator. Specifically, an EMP actuator is housed inside an embossed graphic layer that covers a key of the keyboard. Such a keyboard has a significant user interface value. For example, the embossed key provides the tactile effect of the presence of a key with edges, while allowing for the localized control of haptic vibrations. For such applications, an EMP transducer provides high strains, vibrations or both under control of an electric field. Furthermore, the EMP transducer can generate strong vibrations. When the frequency of the vibrations falls within the acoustic range, the EMP transducer can generate audible sound, thereby functioning as an audio speaker.

Abstract: An angle determining circuit and method, and a folding screen terminal are provided. The circuit is applied to the folding screen terminal which includes a first and second screens rotatably connected through a rotary shaft, a resistance ring is fixedly provided outside the rotary shaft. The circuit includes: a first power supply; a first resistor, where one terminal of the first resistor is electrically connected to the first power supply; a first conductive element fixedly disposed at the first screen, where one terminal of the first conductive element is electrically connected to the other terminal of the first resistor, and the other terminal thereof slidably abuts against the resistance ring; a second conductive element fixedly disposed at the second screen, where one terminal of the second conductive element slidably abuts against the resistance ring, and the other terminal thereof is grounded; and a processor.

Abstract: An invisible, light-transmissive display system with a light resistant material is provided. Substantially invisible, tapered, light-transmissive holes are penetrated in a light transmissive pattern through at least a portion of the light resistant material using a laser beam having a focal width less than the smallest diameter of the tapered holes.

Abstract: The present disclosure relates to the technical field of computers, and provides a method and apparatus for setting virtual keys on a user interface performed by an electronic device. The method includes: determining, in response to at least two touch operations acting on a user interface, at least two pieces of operation position information of the at least two touch operations; identifying, according to the at least two pieces of operation position information, a target virtual key on the user interface; obtaining a target vibration waveform corresponding to the target vibration key, and performing waveform similarity calculation on the target vibration waveform and other vibration waveforms adapted to at least one other virtual key on the user interface to obtain a waveform difference value; and when the waveform difference value is greater than a predefined threshold, determining that the target vibration waveform is associated with the target virtual key.

Abstract: A system and method for electronic collaboration including receiving, by a first digitizer of a first host, a mode switch notification, based on the mode switch notification, changing a mode of the first host to a collaborative mode, sending local content, by the first host, displayed on a multipurpose display screen of the first host to one or more collaboration hosts, receiving, by the first host, published content from the collaboration hosts, displaying the published content and the local content concurrently on the multipurpose display screen of the first host, and updating the multipurpose display screen with updated local content and received published content.

Abstract: A haptic keyboard of an information handling system may include a coversheet to identify a key location of the haptic keyboard; a support layer; a contact foil placed between the coversheet and support layer; a piezoelectric element placed between the contact foil and support layer to receive an applied mechanical stress at the key location of the coversheet and generate an electric actuation signal; and a controller of the information handling system operatively coupled to the contact foil to: receive an electric actuation signal from the piezoelectric element placed under the mechanical stress via the contact foil; and send an electrical response signal to the piezoelectric element to cause the piezoelectric element to generate haptic feedback at the key location.

Abstract: An input module includes a base, a keycap assembly and an identification unit. The base includes a magnetic sensor. The keycap assembly is assembled on the base, and the keycap assembly includes a magnetic element. The identification unit is electrically coupled to the magnetic sensor, and the identification unit determines the type of the keycap assembly according to the characteristics of magnetic field lines of the magnetic element sensed by the magnetic sensor. An electronic device is also disclosed.

Abstract: An image forming apparatus includes an image forming unit configured to form an image on a recording material, a controller configured to control the image forming unit, a sheet feeding tray configured to store a recording material to be supplied to the image forming unit, and a sheet feeding tray cover configured to cover an access point of the sheet feeding tray. The sheet feeding tray cover includes a user interface for inputting information into a controller unit or outputting information from the controller.

Abstract: A multilayer structure includes a first insulating layer including a first body of an anodized oxide material, a first via conductor penetrating through the first body, and a first internal wiring layer electrically connected to the first via conductor, a second insulating layer including a second body of the anodized oxide material, a second via conductor penetrating through the second body, and a second connection pad electrically connected to the second via conductor, and a solder hump provided on one of the first internal wiring layer and the second connection pad and between the first insulating layer and the second insulating layer. The first via conductor, the first internal wiring layer, the second connection pad, and the second via conductor are electrically connected to each other through the solder bump.

Abstract: A display device with favorable display quality is provided. A display portion where a plurality of pixels is arranged in a matrix is divided into Region A and Region B, i.e., regions on the upstream side and the downstream side of a scanning direction. A signal line for supplying an image signal is provided in each of Region A and Region B. Region A and Region B adjoin each other such that a boundary line showing the boundary between the regions is bent. Bending the boundary line suppresses formation of a stripe in a boundary portion. For example, in a given column, the total number of pixels electrically connected to a signal line in Region A is made different from the total number of pixels electrically connected to a signal line in Region B.

Abstract: Wearable computing apparatuses, which can be adapted to be worn on a user's hand, are provided for augmented reality, virtual reality, and artificial intelligence interactions. Generally, the wearable computing apparatus can include a first subassembly comprising one or more processors, non-transitory memory for storing instructions, at least one haptic motor, and a first set of sensors configured to measure positional characteristics associated with a user's hand. The wearable computing apparatus can further comprise a second subassembly removably coupled to the first subassembly, the second subassembly including a plurality of leads each of which is attached to a finger and comprises a distal portion that houses a haptic motor and a second set of sensors. The second set of sensors is configured to measure positional characteristics associated with the user's fingers.

Abstract: An information processing apparatus includes a first display screen, a second display screen, a detection unit, and a display controller. The detection unit detects switching between the first mode and the second mode. The first mode is a mode in which information is displayed on the first display screen. The second mode is a mode in which information is displayed on the first display screen and the second display screen. The display controller controls whether enlarged display or additional display is performed in accordance with a change in the orientation of the first display screen or an operation of specifying the information displayed on the first display screen. The change or the operation is performed in a certain time including a time point at which the detection unit detects switching from the first mode to the second mode.

Abstract: Methods and systems for predicting keystrokes using a neural network analyzing cumulative effects of a plurality of factors impacting the typing behavior of a user. The factors may include typing pattern, previous keystrokes, specifics of keyboard used for typing, and contextual parameters pertaining to a device displaying the keyboard and the user. A plurality of features may be extracted and fused to obtain a plurality of feature vectors. The plurality of feature vectors can be optimized and processed by the neural network to identify known features and learn unknown features that are impacting the typing behavior. Thereby, the neural network predicts keystrokes using the known and unknown features.

Abstract: According to various embodiments, an electronic device may include a first structure including a first plate including a first face and a second face facing away from the first face, and a second structure including a second plate, which faces the second face of the first plate and has an opening formed therein, and a first side wall extending from a first end portion of the second plate. The first structure may be movable between an open state and a closed state with respect to the second structure in a first direction with respect to the second plate. The second structure may be positioned at a first position from the first side wall when the first structure is in the closed state and positioned at a second distance, which is greater than the first distance, from the first side wall when the first structure is in the open state. The electronic device may further include a flexible touch screen display.

Abstract: Systems and methods are described for providing ways to protect client devices in communication with virtual desktops and virtual applications from keylogging attacks. A keyboard filter driver obfuscates scancodes from key presses produced on the keyboard of the client device so that malicious keylogging or keyboard hooking software is not able to observe user inputs. The obfuscated scancodes are conveyed and de-obfuscated before being applied in the virtual desktop or virtual application.

Abstract: An aspect of the present disclosure provides for determining characters inputted. In an embodiment, a key activated among one or more keys of a keyboard and a sensor activated among one or more sensors associated with one or more fingers are identified. An element or a special function corresponding to the key activated and an element or a special function corresponding to the sensor activated are determined. A character is determined based on the element or the special function corresponding to the key activated and the element or the special function corresponding to the sensor activated. A first set of elements of an Indic language and a first set of special functions are assigned to the one or more keys of the keyboard, and a second set of elements of the Indic language and a second set of special functions are assigned to the one or more sensors.

Abstract: Dual, ergonomically ideal, neutral-posture, wireless-and-programmable, joinable keys-input devices/housings (FIGS.

Abstract: A portable information handling system integrates a keyboard having plural sensors configured at each of keyboard key positions to detect key inputs made with presses at the key positions by deflection of a glass cover having a reduced thickness at each key position. Haptic devices, such as piezo actuators, actuate at sensor sensed inputs to reinforce end user input touch feedback over the feedback provided by deflection of the glass cover. In one embodiment, the plural sensors are incorporated in a membrane having OLED illumination that identifies the key value at each key position.

Abstract: Disclosed is a laptop having dual monitors that are arranged vertically, the laptop comprising: a main monitor 210 having a vertical width of a first size; a body 220 having, on one side thereof, a first hinge unit 221 formed so as to fold the main monitor 210, and a keyboard 222 spaced from the first hinge unit 221 so as to be arranged on the lower end of an upper plate; and a folder-type sub monitor 230 which has a vertical width of a second size that is relatively smaller than the vertical width of the first size, and which is adjacent to the keyboard 222 so as to ascend at a certain inclined angle on the basis of a second hinge unit 231 formed on the upper end of the upper plate of the body 220, and thus the present invention divides a screen so that different UIs may be respectively provided through the main monitor 210 and the sub monitor 230.

Abstract: In an embodiment, a system may include one or more processors forming central processing units (CPUs) in the system, a display controller configured to display frames on a display device, a memory controller configured to control a memory, and a power management circuit. The power management circuit may be configured to establish one of a plurality of power states in the system. In a first power state, the display controller and the memory controller are powered on while the CPUs are powered off. The display controller may be configured to read a plurality of prerendered frames from the memory and display the plurality of prerendered frames at times specified for each of the plurality of prerendered frames.

Abstract: A gesture-enabled keyboard and method are defined. The gesture-enabled keyboard includes a keyboard housing including one or more keyboard keys for typing, a pair of stereo camera sensors mounted within the keyboard housing, a field of view of the pair of stereo camera sensors projecting substantially perpendicularly to the plane of the keyboard housing, and a pair of micro-electronic machines, each of the micro-electronic machines being coupled with, and adapted to adjust a position of a corresponding one of the pair of stereo cameras. A background of the field of view is updated when one or more alternative input devices are in use. A gesture region including a plurality of interaction zones and a virtual membrane defining a region of transition from one of the plurality of interaction zones to another of the plurality of interaction zones is defined within the field of view of the pair of stereo camera sensors.

Abstract: An input device comprises a depressible element with two switches including a first switch configured to generate a first signal when the depressible element is depressed by a threshold distance and a second switch configured to generate a second signal indicating when the depressible element is depressed by the threshold distance and the second switch is in an active state. One or more processors may be configured to receive the first signal from the first switch; configure the second switch to change from an inactive state to an active state in response to receiving the first signal; receive the second signal from the second switch in the active state; determine whether the second signal indicates that the depressible element is depressed by the threshold distance; and generate event data confirming that the depressible element is depressed by the threshold distance in response to receiving the second signal.

Abstract: The techniques disclosed herein utilize predictive gestures to preload and/or execute application components to provide improved responsiveness and loading times in software applications. In some configurations, a system can monitor user input gestures to determine if a user-controlled cursor moves into a detection area positioned in proximity to one or more selectable user interface (“UI”) elements. When a user input causes a cursor to move into the detection area, a computing device can preload or execute one or more application components in memory. The system can also dynamically adjust the position, size and/or shape of the detection area based on a number of factors, including the recognition of one or more predetermined input gestures. By dynamically adjusting a detection area, the system can optimize the predictive techniques for identifying the intent of a user for initiating preload or pre-execution operations for one or more application components.

Abstract: A device and method for providing recommended words for a character input by a user are provided. The method by which the device provides recommended words includes: receiving an input for inputting a character in a character input window; recommending at least one pseudo-morpheme including the input character by analyzing the input character; recommending at least one extended word including a selected pseudo-morpheme in response to receiving an input for selecting one of the at least one pseudo-morpheme; and displaying a selected extended word in response to receiving an input for selecting one of the at least one extended word.

Abstract: Apparatuses, methods, systems, and program products are disclosed for nanotechnology fabrication in a virtual reality environment. An apparatus includes a simulation module configured to generate a virtual reality environment for simulating a nanotechnology fabrication line. An apparatus includes a task module configured to provide one or more tasks associated with nanotechnology fabrication for a user to complete during a simulation within a virtual reality environment. An apparatus includes an assessment module configured to assess a user's performance while completing one or more tasks during a simulation within a virtual reality environment.

Abstract: A method and device for reading, writing, and communication by deafblind users is provided to enable such exemplary functions as word processing, text messaging, Internet access, and telephonic communication. By combining a chordic keyboard for user input with a self-scrolling Braille pad for reading Braille, embodiments of the invention enable the user's hands to stay in place on a user console rather than having to constantly switch back and forth between typing messages versus reading or checking for messages. This in turn enables duplex communication because the user can read or acknowledge incoming messages even while typing. It also reduces the dynamic complexity experienced in reading Braille because a body part used for reading Braille can remain constantly available for receiving messages simply by resting in place on the self-scrolling Braille pad without any swiping, thereby eliminating swiping gestures and the problem of timing them with the receipt of messages.

Abstract: A workwear unit for detecting, documenting, analyzing, monitoring and/or teaching processes includes a portable control system, at least one functional module connected with the portable control system, and which comprises at least a sensor module and a peripheral device, and at least a glove fastening the portable control system and the functional module to a user's body. The portable control system and the sensor module form a structural unit connected with the glove. The sensor module has a barcode scanner fastened to the back of a hand. The peripheral device has an electrical release which is arranged outside on an index finger of the glove.

Abstract: In an example, a biometric sensor, includes a first communication interface to receive information associated with an enumeration of the biometric sensor from a host, a second communication interface, and input sensing circuitry to detect an input signal at the biometric sensor. The biometric sensor further includes a controller to, in response to detecting the input signal, transmit a message to wake up the host via the second communication interface, and in response to receiving an indication that a lid of the host has closed, control operation of the biometric sensor by placing the biometric sensor in a low power state.

Abstract: One variation of a system for interfacing a computer system and a user includes: a touch sensor defining a touch sensor surface and extending over an array of sense electrode and drive electrode pairs; a vibrator coupled to the touch sensor surface; and a controller configured to: detect application of an input onto the touch sensor surface and a force magnitude of the first input at a first time; execute a down-click cycle in response to the force magnitude exceeding a threshold magnitude by driving the vibrator to oscillate the touch sensor surface; map a location of the input on the touch sensor surface to a key of a keyboard represented by the touch sensor surface; and output a touch image representing the key and the force magnitude of the input on the touch sensor surface at approximately the first time.

Abstract: A system that incorporates the subject disclosure may include, for example, device may perform operations for receiving a signal from an operational space associated with an accessory device, determining hand feature information according to the signal, accessing device location information associated with the computing accessory device, generating hand-device interaction information according to the hand feature information and device location information associated with the accessory device, and transmitting the hand-device interaction information to a virtual reality system, wherein the virtual reality system generates, according to the hand-device interaction information, a virtual hand and a virtual accessory device in a virtual reality image. Additional embodiments are disclosed.

Abstract: A flexible, rollable display system includes a display and one or more cover components coupled thereto. The cover components include openings that, when the display is wound around a roller, reduce induced stresses and the likelihood of the display cracking. The roller may include a flat portion to accommodate a printed circuit board or other electronic components less flexible than the display. The cover component(s) may be formed of heat radiating material(s) to improve performance of the system.

Abstract: An electronic device is provided and includes a display including a front area and a plurality of side areas, at least one processor, and at least one memory. The at least one memory stores instructions configured to, when executed, enable the at least one processor to receive a grip input for the display, identify a grip type based on the grip input, receive a touch input to at least one of the plurality of side areas while the electronic device is gripped, and identify a function corresponding to the touch input based on the identified grip type.

Abstract: According to various embodiments, there is provided a user input device including: a chassis including a socket configured to releasably receive a panel; a memory storing a plurality of button maps, wherein each button map of the plurality of button maps defines functions of at least one button of a respective panel of a plurality of panels, each of which being receivable in the socket; and a processor configured to read an identity code of the received panel, and further configured to identify a matching button map from the plurality of button maps based on the identity code, wherein the matching button map defines the functions of the at least one button of the received panel.

Abstract: A keyboard overlay film forming a plurality of keycap accommodating cavities and a key-gap space, the key-gap space surrounding the keycap accommodating cavities, and the keycap accommodating cavities respectively including a key projection surface, wherein the keyboard overlay film includes a top protective layer; a character layer located on a side of the top protective layer forming the keycap accommodating cavities, and the character layer includes a plurality of light-transparent characters respectively corresponding to the key projection surface of the keycap accommodating cavities; a set of touch electrodes located on a side of the character layer opposite to the top protective layer; and a lower protective layer located on a side of the set of touch electrodes opposite to the character layer.

Abstract: An image processing system and an image processing method for localising recognised characters in an image. An estimation unit is configured to estimate a first location of a recognised character that has been obtained by performing character recognition of the image. A determination unit is configured to determine second locations of a plurality of connected components in the image. A comparison unit is configured to compare the first location and the second locations, to identify a connected component associated with the recognised character. An association unit is configured to associate the recognised character, the identified connected component, and the second location of the identified connected component.

Abstract: An input recognition method carried out by an electronic device implemented by a computer comprises the steps of generating a virtual grid of which the distance between lines is variable, in correspondence with at least a partial region of a display included in or connected to the electronic device; and recognizing, by using an index of the virtual grid, a position selected by a user of the electronic device in the region of the display corresponding to the virtual grid.

Abstract: Systems and methods for adjusting a user interface presented in a mobile device display. A method for adjusting a user interface presented on a mobile device display includes receiving sensor data from one or more sensors of a mobile device, determining a hand of a user that is holding the mobile device based on the received sensor data, and adjusting the user interface presented on the mobile device display based on the determination.

Abstract: An information transmission system is formed by a plurality of input devices for the transmission of an information data, wherein each input device is signally connected to an electronic device. An information transmission method includes the following steps: one of the plurality of input devices receives a connection request from another input device; the input device receiving the connection request creates a wireless communication with the input device that issues the connection request according to the connection request; the input device receiving the connection request receives an information data transmitted by the input device that issues the connection request and transmits the information data to the electronic device connected to the input device that receives the connection request.

Abstract: A computing device, such as a wearable device, may include a gesture sensor that generates a gesture signal in response to a gesture of a user performed while the computing device is being worn or held by the user. A calibration sensor may generate a calibration signal characterizing a degree of tightness with which the computing device is being worn or held by the user. The gesture signal may be calibrated using the calibration signal, to obtain a calibrated gesture signal that is calibrated with respect to the degree of tightness. At least one function of the at least one computing device may be implemented, based on the calibrated gesture signal.

Abstract: The invention describes an infrared imaging assembly (1) for capturing an infrared image (M0, M1) of a scene (S), comprising an infrared-sensitive image sensor (14); an irradiator (10) comprising an array of individually addressable infrared-emitting LEDs, wherein each infrared-emitting LED is arranged to illuminate a scene region (S1, . . . , S9); a driver (11) configured to actuate the infrared irradiator (10) by applying a switching pulse train (T1, . . . , T9) to each infrared-emitting LED; an image analysis module (13) configured to analyse a preliminary infrared image (M0) to determine the required exposure levels (130) for each of a plurality of image regions (R1, . . . , R9); and a pulse train adjusting unit (12) configured to adjust the duration (L1, . . . , L9) of a switching pulse train (T1, . . . , T9) according to the required exposure levels (130).

Abstract: Systems and methods provide haptic feedback within areas of keyboard using a single haptic device, while isolating the feedback to keys that are being pressed. A keyboard may include multiple key areas. Each key area includes a mechanical actuator. Each key area also includes a sensor layer located below a plurality of haptic key plates and located above the mechanical actuator. Each key area also includes a flexible membrane that dampens haptic feedback and separates each of the haptic key plates from neighboring key plates. Each key area also includes haptic key plates that each include one or more protrusions. When a key plate is pressed, protrusions of the pressed key plate contact the sensor layer to trigger activation of the mechanical actuator to generate haptic feedback. The protrusions of the pressed key plate transmit the generated haptic feedback from the mechanical actuator to the key plate.

Abstract: A convertible electronic device includes a display module including a first region and a second region surrounding the first region and having a lower light transmittance than the first region; a camera module disposed on the display module to overlap the first region; a first housing which accommodates the display module therein, and includes a camera module accommodating portion protruding outwardly to overlap the camera module; a keyboard; a second housing which accommodates the keyboard therein; and a hinge member connecting the first housing to the second housing rotatably to each other with respect to a rotation shaft. The first and second housings are in a first folded state where the first and second housings overlap each other to allow front surfaces to face each other or in a second folded state where the first and second housings overlap each other to allow rear surfaces to face each other.