Patent Publication Number: US-10310733-B2

Title: Method and electronic device for recognizing touch

Description:
CLAIM OF PRIORITY 
     This application claims the benefit under 35 U.S.C. § 119(a) of a Korean patent application filed on Aug. 1, 2016 in the Korean Intellectual Property Office and assigned Serial number 10-2016-0098167 and a Korean patent application filed on Jan. 19, 2017 in the Korean Intellectual Property Office and assigned Serial number 10-2017-0009445, the entire disclosure of which is hereby incorporated by reference. 
     TECHNICAL FIELD 
     The present disclosure generally relates to a method for recognizing a touch input and an electronic device performing the same. 
     BACKGROUND 
     With the development of mobile communication technologies, the latest electronic devices may freely connect to wireless/wired networks and are easily portable. For example, portable electronic devices such as smartphones, tablet personal computers (PC), and the like are able to support various functions, such as connecting to the Internet and playing back multimedia content, placing phone calls, send/receive messages, etc. 
     The display of the portable electronic device may be implemented with a touchscreen display that includes a touch sensor. The touchscreen display may perform the role of an input device that receives user manipulation or input, and also perform the role of an output device that provides visual displays to the user. 
     SUMMARY 
     The electronic device may also output information, such as time, date, and/or notifications, in the touchscreen display even when the electronic device is in an inactive state (e.g., in a sleep state). In the scenario, the electronic device implements a so-called always-on display (AOD) and outputs information even in the inactive state when power consumption is reduced. 
     The electronic device may output, for example, graphic user interface (GUI) objects such as icons of applications, widgets, and notification events, in the AOD. But because the electronic device is inactive, the user may not be allowed to directly select the GUI object displayed in the AOD. It is because while inactive, the touch sensor of the touch screen may be inoperative. In this case, the user has to first place the electronic device back in the active state (e.g. by pressing the home button of the device). Then, the user may select one of the GUI objects presented on the touchscreen display while the electronic device was in the active state. 
     Aspects of the present disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the present disclosure is to provide a method for recognizing an effective touch to a GUI object through a specific area on a touchscreen display when an electronic device is in an inactive state (e.g., a sleep state) and the electronic device performing the same. 
     In accordance with an aspect of the present disclosure, an electronic device may include a processor, a touch sensor, and a touch controller including a register. The processor may write, into the register, data associated with a partial area of the touch sensor specified to sense an effective touch. When the effective touch is sensed in the partial area of the touch sensor, the touch controller may write data associated with the effective touch into the register. And when the data associated with the effective touch is written into the register, the processor may read the data associated with the effective touch from the register. 
     In accordance with another aspect of the present disclosure, a touch recognition method may include writing, into a register included in a touch controller, data associated with a partial area of a touch sensor specified to sense an effective touch, when the effective touch is sensed in the partial area of the touch sensor, writing, by the touch controller, data associated with the effective touch into the register, and when the data associated with the effective touch is written into the register, reading the data associated with the effective touch from the register. 
     In accordance with another aspect of the present disclosure, an electronic may include a housing that includes a first surface and a second surface opposite the first surface, a display that is exposed through the first surface and is interposed between the first surface and the second surface, a touch panel that is interposed between the display and the first surface or is coupled to the display, a display driver integrated circuit (DDI) that is electrically connected to the display and including a first memory, a touch controller integrated circuit (IC) electrically connected to the touch panel and includes a second memory, a processor that is electrically connected to the DDI and the touch controller IC, a nonvolatile memory that is electrically connected to the processor. The nonvolatile memory may store instructions that, when executed, cause the processor to store, in the first memory, first data associated with a graphic user interface (GUI) to be displayed in a partial area of the display when the processor is in an inactive or sleep state, to store second data associated with the partial area of the display in the second memory, and to enter the inactive or sleep state after storing the first data and the second data in the first memory and the second memory, respectively. 
     Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the present disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features, and advantages of certain embodiments of the present disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  illustrates an electronic device in a network environment according to one embodiment; 
         FIG. 2  illustrates a block diagram of the electronic device according to one embodiment; 
         FIG. 3  illustrates a block diagram of a program module according to one embodiment; 
         FIG. 4  illustrates the electronic device according to one embodiment of the present disclosure; 
         FIG. 5A  illustrates a block diagram of the electronic device according to one embodiment; 
         FIG. 5B  illustrates a touch sensor according to one embodiment; 
         FIG. 6A  is a block diagram of a touch sensor according to one embodiment; 
         FIG. 6B  illustrates touch recognition by a touch sensor according to one embodiment; 
         FIG. 6C  illustrates movement of a touch recognition area according to one embodiment; 
         FIG. 7A  illustrates an operation of a touch controller in an inactive state (or sleep state), according to one embodiment; 
         FIG. 7B  illustrates a register of a touch controller according to one embodiment; 
         FIG. 8A  illustrates recognition of an effective double touch according to one embodiment; 
         FIG. 8B  illustrates recognition of the effective double touch according to another embodiment; 
         FIG. 8C  illustrates recognition of the effective double touch according to yet another embodiment; 
         FIG. 9A  is a flowchart illustrating a touch recognition method according to one embodiment; 
         FIG. 9B  is a flowchart illustrating the touch recognition method according to another embodiment; and 
         FIG. 10  is a flowchart illustrating the touch recognition method according to another embodiment. 
     
    
    
     Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures. 
     DETAILED DESCRIPTION 
     Hereinafter, various embodiments of present disclosure will be described with reference to accompanying drawings. Accordingly, those skilled in the art will recognize that modifications, equivalents, and/or alternatives of the various embodiments described herein can be variously made without departing from the scope and spirit of present disclosure. 
     In this disclosure, the expressions “have,” “may have,” “include,” and “comprise,” “may include,” and “may comprise” indicate existence of corresponding features (e.g., elements such as numeric values, functions, operations, or components) but do not exclude presence of additional features. 
     In this disclosure, the expressions “A or B,” “at least one of A or/and B,” or “one or more of A or/and B,” and the like may include any and all combinations of one or more of the associated listed items. For example, the term “A or B,” “at least one of A and B,” or “at least one of A or B” may refer to any or all of the cases (1) where at least one A is included, the case (2) where at least one B is included, or the case (3) where both of at least one A and at least one B are included. 
     The terms, such as “first,” “second,” and the like used in this disclosure may be used to refer to various elements regardless of the order and/or the priority and to distinguish the relevant elements from other elements, but do not limit the elements. For example, “a first user device” and “a second user device” indicate different user devices regardless of the order or the priority. For example, without departing the scope of this disclosure, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. 
     It will be understood that when an element (e.g., a first element) is referred to as being “(operatively or communicatively) coupled with/to” or “connected to” another element (e.g., a second element), it may be directly coupled with/to or connected to the other element or an intervening element (e.g., a third element) may be present. In contrast, when an element (e.g., a first element) is referred to as being “directly coupled with/to” or “directly connected to” another element (e.g., a second element), it should be understood that there are no intervening element (e.g., a third element). 
     According to the situation, the expression “configured to” used in this disclosure may be used as, for example, the expression “suitable for,” “having the capacity to,” “designed to,” “adapted to,” “made to,” or “capable of” The term “configured to” may not mean only “specifically designed to” in hardware. Instead, the expression “a device configured to” may mean that the device is “capable of” operating together with another device or other components. For example, a “processor configured to (or set to) perform A, B, and C” may mean a dedicated processor (e.g., an embedded processor) for performing a corresponding operation or a generic-purpose processor (e.g., a central processing unit (CPU) or an application processor) which performs corresponding operations by executing one or more software programs which are stored in a memory device. 
     Terms used in this disclosure are used to describe specified embodiments and are not intended to limit the scope of another embodiment. The terms of a singular form may include plural forms unless otherwise specified. All the terms used herein, which include technical or scientific terms, may have the same meaning that is generally understood by those skilled in the art. It will be further understood that terms, which are defined in a dictionary and commonly used, should also be interpreted as being customary in the relevant art unless expressly so defined in the disclosure. In some cases, even if certain terms are defined in this disclosure, they may not be interpreted to exclude embodiments of this disclosure. 
     An electronic device according to various embodiments of this disclosure may include at least one of smartphones, tablet personal computers (PCs), mobile phones, video telephones, electronic book readers, desktop PCs, laptop PCs, netbook computers, workstations, servers, personal digital assistants (PDAs), portable multimedia players (PMPs), Motion Picture Experts Group (MPEG-1 or MPEG-2) Audio Layer 3 (MP3) players, mobile medical devices, cameras, or wearable devices. According to various embodiments, the wearable device may be an accessory (e.g., watches, rings, bracelets, anklets, necklaces, glasses, contact lens, or head-mounted-devices (HMDs), a fabric or garment-integrated device (e.g., an electronic apparel), a body-attached device (e.g., a skin pad or tattoos), or a bio-implantable device (e.g., an implantable circuit). 
     According to one or more embodiments, the electronic device may be a home appliance. The home appliances may include at least one of, for example, televisions (TVs), digital versatile disc (DVD) players, audios, refrigerators, air conditioners, cleaners, ovens, microwave ovens, washing machines, air cleaners, set-top boxes, home automation control panels, security control panels, TV boxes (e.g., Samsung HomeSync™, Apple TV™, and Google TV™), game consoles (e.g., Xbox™ and PlayStation™), electronic dictionaries, electronic keys, camcorders, electronic picture frames, and the like. 
     According to other embodiments, an electronic device may be various medical devices (e.g., various portable medical measurement devices (e.g., a blood glucose monitoring device, a heartbeat measuring device, a blood pressure measuring device, a body temperature measuring device, and the like), a magnetic resonance angiography (MRA), a magnetic resonance imaging (MRI) device, a computed tomography (CT), scanners, and ultrasonic devices), navigation devices, Global Navigation Satellite System (GNSS), event data recorders (EDRs), flight data recorders (FDRs), vehicle infotainment devices, electronic equipment for vessels (e.g., navigation systems and gyrocompasses), avionics, security devices, head units for vehicles, industrial or home robots, automatic teller&#39;s machines (ATMs), points of sales (POSs) of stores, or internet of things (e.g., light bulbs, various sensors, electric or gas meters, sprinkler devices, fire alarms, thermostats, street lamps, toasters, exercise equipment, hot water tanks, heaters, boilers, and the like). 
     According to yet other embodiments, the electronic device may include parts of furniture or buildings/structures, electronic boards, electronic signature receiving devices, projectors, or various measuring instruments (e.g., water meters, electricity meters, gas meters, or wave meters, and the like). According to one or more embodiments, the electronic device may be one of the above-described devices or a combination thereof. An electronic device according to an embodiment may be a flexible electronic device. Furthermore, an electronic device according to an embodiment of this disclosure may not be limited to the above-described electronic devices and may include other electronic devices and/or new electronic devices developed in the art. 
     Hereinafter, electronic devices according to the various disclosed embodiments will be described with reference to the accompanying drawings. In this disclosure, the term “user” may refer to a person who uses an electronic device or may refer to a device (e.g., an artificial intelligence electronic device) that uses the electronic device. 
       FIG. 1  illustrates a block diagram of an electronic device in a network environment, according to one embodiment. 
     Referring to  FIG. 1 , according to one embodiment, an electronic device  101 ,  102 , or  104  or a server  106  may be connected with each other over a network  162  or local wireless communication  164 . The electronic device  101  may include a bus  110 , a processor  120 , a memory  130 , an input/output interface  150 , a display  160 , and a communication interface  170 . According to an embodiment, the electronic device  101  may not include at least one of the above-described elements or may further include other element(s). 
     For example, the bus  110  may interconnect the above-described elements  110  to  170  and may include a circuit for conveying communications (e.g., a control message and/or data) among the above-described elements. 
     The processor  120  may be a central processing unit (CPU), an application processor (AP), or a communication processor (CP). For example, the processor  120  may perform arithmetic operations or data processing associated with control and/or communication of at least one other element(s) of the electronic device  101 . 
     The memory  130  may be a volatile and/or nonvolatile memory. For example, the memory  130  may store instructions or data associated with at least one other element(s) of the electronic device  101 . According to an embodiment, the memory  130  may store software and/or a program  140 . The program  140  may include, for example, kernel  141 , middleware  143 , application programming interface (API)  145 , and/or application program (or “application”)  147 . At least a part of the kernel  141 , the middleware  143 , or the API  145  may be referred to as an “operating system (OS)”. 
     For example, the kernel  141  may control or manage system resources (e.g., the bus  110 , the processor  120 , the memory  130 , and the like) that are used to execute operations or functions of other programs (e.g., the middleware  143 , the API  145 , and the application program  147 ). Furthermore, the kernel  141  may provide an interface that allows the middleware  143 , the API  145 , or the application program  147  to access discrete elements of the electronic device  101  so as to control or manage system resources. 
     The middleware  143  may perform, for example, a mediation role such that the API  145  or the application program  147  communicates with the kernel  141  to exchange data. 
     Furthermore, the middleware  143  may process one or more task requests received from the application program  147  according to a priority. For example, the middleware  143  may assign the priority, which makes it possible to use system resources (e.g., the bus  110 , the processor  120 , the memory  130 , or the like) of the electronic device  101 , to at least one of the application programs  147 . For example, the middleware  143  may process the one or more task requests according to the priority, which makes it possible to perform scheduling or load balancing of the one or more task requests. 
     The API  145  may be, for example, an interface through which the application program  147  controls a function provided by the kernel  141  or the middleware  143 , and may include, for example, at least one interface or function (e.g., an instruction) for a file control, a window control, image processing, a character control, or the like. 
     The input/output interface  150  may be an interface which transmits an instruction or data input from a user or another external device, to other element(s) of the electronic device  101 . Furthermore, the input/output interface  150  may output instructions or data, received from other element(s) of the electronic device  101 , to the user or another external device. 
     The display  160  may be a liquid crystal display (LCD), a light-emitting diode (LED) display, an organic LED (OLED) display, a microelectromechanical systems (MEMS) display, or an electronic paper display, etc. The display  160  may display, for example, various content (e.g., a text, an image, a video, an icon, a symbol, and the like) to the user. The display  160  may include a touch screen and may receive, for example, touch, gesture, proximity, or hovering inputs using an electronic pen or a part of the user&#39;s body. 
     The communication interface  170  may establish communication between the electronic device  101  and an external device (e.g., the first external electronic device  102 , the second external electronic device  104 , or the server  106 ). For example, the communication interface  170  may be connected to the network  162  over wireless communication or wired communication to communicate with the external device (e.g., the second external electronic device  104  or the server  106 ). 
     The wireless communication may include cellular communication employing at least one of, for example, long-term evolution (LTE), LTE Advanced (LTE-A), Code Division Multiple Access (CDMA), Wideband CDMA (WCDMA), Universal Mobile Telecommunications System (UMTS), Wireless Broadband (WiBro), Global System for Mobile Communications (GSM), or the like, as cellular communication protocol. According to an embodiment, the wireless communication may include, for example, at least one of wireless fidelity (Wi-Fi), Bluetooth, Bluetooth low energy (BLE), Zigbee, near field communication (NFC), magnetic stripe transmission (MST), radio frequency (RF), a body area network (BAN), and a global navigation satellite system (GNSS). 
     The MST may generate a pulse in response to transmission data using an electromagnetic signal, and the pulse may generate a magnetic field signal. The electronic device  101  may transfer the magnetic field signal to point of sale (POS), and the POS may detect the magnetic field signal using a MST reader. The POS may recover the data by converting the detected magnetic field signal to an electrical signal. 
     The GNSS may be, for example, a global positioning system (GPS), a global navigation satellite system (Glonass), a Beidou navigation satellite system (Beidou), or an European global satellite-based navigation system (Galileo). The GNSS may be selected based on the available region, the selected bandwidth, or the like. Hereinafter, in this disclosure, “GPS” and “GNSS” may be interchangeably used. The wired communication may employ, for example, universal serial bus (USB), high definition multimedia interface (HDMI), recommended standard-232 (RS-232), plain old telephone service (POTS), or the like. The network  162  may include a telecommunications network such as a computer network (e.g., LAN or WAN), the Internet, or a telephone network. 
     Each of the first and second external electronic devices  102  and  104  may be different from or the same as that of the electronic device  101 . According to an embodiment, the server  106  may include a group of one or more servers. According to one embodiment, all or a portion of operations performed in the electronic device  101  may be executed by another electronic device (e.g., the electronic devices  102  and  104  or the server  106 ). According to an embodiment, in the case where the electronic device  101  executes a function or service automatically or in response to a request, the electronic device  101  may not perform the function or the service internally, but, alternatively or additionally, it may request at least a portion of the function or service be performed by another device (e.g., the electronic device  102  or  104  or the server  106 ). The other electronic device (e.g., the electronic device  102  or  104  or the server  106 ) may execute the requested function and may transmit the execution result to the electronic device  101 . The electronic device  101  may provide the requested function or service using the received result or may additionally process the received result to provide the requested function or service. To this end, for example, cloud computing, distributed computing, or client-server computing may be used. 
       FIG. 2  illustrates a block diagram of an electronic device, according to one embodiment. 
     Referring to  FIG. 2 , an electronic device  201  may include, for example, an entire part or a part of the electronic device  101  illustrated in  FIG. 1 . The electronic device  201  may include one or more processors (e.g., an application processor; AP)  210 , a communication module  220 , a subscriber identification module  229 , a memory  230 , a sensor module  240 , an input device  250 , a display  260 , an interface  270 , an audio module  280 , a camera module  291 , a power management module  295 , a battery  296 , an indicator  297 , and a motor  298 . 
     The processor  210  may operate, for example, an operating system (OS) or an application to control a plurality of hardware or software elements connected to the processor  210  and may process and compute a variety of data. For example, the processor  210  may be implemented with a System on Chip (SoC). According to an embodiment, the processor  210  may further include a graphic processing unit (GPU) and/or an image signal processor. The processor  210  may include at least a part (e.g., a cellular module  221 ) of elements illustrated in  FIG. 2 . The processor  210  may load an instruction or data, which is received from at least one of other elements (e.g., a nonvolatile memory), into a volatile memory and process the loaded instruction or data. The processor  210  may store a variety of data in the nonvolatile memory. The processor  210  may include a microprocessor or any suitable type of processing circuitry, such as one or more general-purpose processors (e.g., ARM-based processors), a Digital Signal Processor (DSP), a Programmable Logic Device (PLD), an Application-Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), a Graphical Processing Unit (GPU), a video card controller, etc. In addition, it would be recognized that when a general purpose computer accesses code for implementing the processing shown herein, the execution of the code transforms the general purpose computer into a special purpose computer for executing the processing shown herein. Certain of the functions and steps provided in the Figures may be implemented in hardware, software or a combination of both and may be performed in whole or in part within the programmed instructions of a computer. No claim element herein is to be construed under the provisions of 35 U.S.C. 112, sixth paragraph, unless the element is expressly recited using the phrase “means for”. In addition, an artisan understands and appreciates that a “processor” or “microprocessor” may be hardware in the claimed disclosure. Under the broadest reasonable interpretation, the appended claims are statutory subject matter in compliance with 35 U.S.C. § 101. 
     The communication module  220  may be configured the same as or similar to the communication interface  170  of  FIG. 1 . The communication module  220  may include a cellular module  221 , a Wi-Fi module  222 , a Bluetooth (BT) module  223 , a GNSS module  224  (e.g., a GPS module, a Glonass module, a Beidou module, or a Galileo module), a near field communication (NFC) module  225 , a MST module  226 , and a radio frequency (RF) module  227 . 
     The cellular module  221  may provide, for example, voice communication, video communication, Internet service, or the like over a communication network. According to an embodiment, the cellular module  221  may perform discrimination and authentication of the electronic device  201  within the communication network by using the subscriber identification module (e.g., a SIM card)  229 . According to an embodiment, the cellular module  221  may perform at least a portion of functions that the processor  210  provides. According to an embodiment, the cellular module  221  may include a communication processor (CP). 
     Each of the Wi-Fi module  222 , the BT module  223 , the GNSS module  224 , the NFC module  225 , or the MST module  226  may include a processor for processing data exchanged through the corresponding module, for example. According to an embodiment, at least some (e.g., two or more) of the cellular module  221 , the Wi-Fi module  222 , the BT module  223 , the GNSS module  224 , the NFC module  225 , or the MST module  226  may be included within one Integrated Circuit (IC) or an IC package. 
     For example, the RF module  227  may transmit and receive communication signals (e.g., RF signals). For example, the RF module  227  may include a transceiver, a power amplifier module (PAM), a frequency filter, a low noise amplifier (LNA), an antenna, or the like. According to another embodiment, at least one of the cellular module  221 , the Wi-Fi module  222 , the BT module  223 , the GNSS module  224 , the NFC module  225 , or the MST module  226  may transmit and receive RF signals through a separate RF module. 
     The subscriber identification module  229  may be for example, a card and/or an embedded SIM that includes the subscriber identification module and may include unique identify information (e.g., integrated circuit card identifier (ICCID)) or subscriber information (e.g., international mobile subscriber identity (IMSI)). 
     The memory  230  (e.g., the memory  130 ) may include an internal memory  232  or an external memory  234 . For example, the internal memory  232  may be a volatile memory (e.g., a dynamic random access memory (DRAM), a static RAM (SRAM), a synchronous DRAM (SDRAM), or the like), a nonvolatile memory (e.g., a one-time programmable read only memory (OTPROM), a programmable ROM (PROM), an erasable and programmable ROM (EPROM), an electrically erasable and programmable ROM (EEPROM), a mask ROM, a flash ROM, a flash memory (e.g., a NAND flash memory or a NOR flash memory), or the like), a hard drive, or a solid state drive (SSD). 
     The external memory  234  may further be a flash drive such as compact flash (CF), secure digital (SD), micro secure digital (Micro-SD), mini secure digital (Mini-SD), extreme digital (xD), a multimedia card (MMC), a memory stick, or the like. The external memory  234  may be operatively and/or physically connected to the electronic device  201  through various interfaces. 
     A security module  236  may be a module that includes a storage space for which the security level is higher than that of the memory  230  and may be a circuit that guarantees safe data storage in a protected execution environment. The security module  236  may be implemented with a separate circuit and may include a separate processor. For example, the security module  236  may be in a smart chip or a secure digital (SD) card, which is removable, or may include an embedded secure element (eSE) embedded in a fixed chip of the electronic device  201 . Furthermore, the security module  236  may operate based on an operating system (OS) that is different from the OS of the electronic device  201 . For example, the security module  236  may operate based on java card open platform (JCOP) OS. 
     The sensor module  240  may measure, for example, a physical quantity or may detect an operation state of the electronic device  201 . The sensor module  240  may convert the measured or detected information to an electric signal. For example, the sensor module  240  may include at least one of a gesture sensor  240 A, a gyro sensor  240 B, a barometric pressure sensor  240 C, a magnetic sensor  240 D, an acceleration sensor  240 E, a grip sensor  240 F, the proximity sensor  240 G, a color sensor  240 H (e.g., red, green, blue (RGB) sensor), a biometric sensor  240 I, a temperature/humidity sensor  240 J, an illuminance sensor  240 K, or an UV sensor  240 M. Although not illustrated, the sensor module  240  may further include, for example, an E-nose sensor, an electromyography (EMG) sensor, an electroencephalogram (EEG) sensor, an electrocardiogram (ECG) sensor, an infrared (IR) sensor, an iris sensor, and/or a fingerprint sensor. The sensor module  240  may further include a control circuit for controlling at least one or more sensors included therein. According to an embodiment, the electronic device  201  may further include a processor that is a part of the processor  210  or independent of the processor  210  and is configured to control the sensor module  240 . The processor may control the sensor module  240  while the processor  210  remains at a sleep state. 
     The input device  250  may be, for example, a touch panel  252 , a (digital) pen sensor  254 , a key  256 , or an ultrasonic input unit  258 . For example, the touch panel  252  may use capacitive, resistive, infrared and/or ultrasonic detecting methods. Also, the touch panel  252  may further include a control circuit. The touch panel  252  may further include a tactile layer to provide tactile feedback to the user. 
     The (digital) pen sensor  254  may be, for example, a part of a touch panel or may include an additional sheet for recognition. The key  256  may include, for example, a physical button, an optical key, or a keypad. The ultrasonic input device  258  may detect (or sense) an ultrasonic signal, which is generated from an input device, through a microphone (e.g., a microphone  288 ) and may check data corresponding to the detected ultrasonic signal. 
     The display  260  (e.g., the display  160 ) may be the panel  262 , the hologram device  264 , or the projector  266 . The panel  262  may be the same as or similar to the display  160  illustrated in  FIG. 1 . The panel  262  may be implemented, for example, to be flexible, transparent or wearable. The panel  262  and the touch panel  252  may be integrated into a single module. The hologram device  264  may display a stereoscopic image into space using light interference. The projector  266  may project light onto a screen so as to display an image. For example, the screen may be arranged to be within or outside the electronic device  201 . According to an embodiment, the panel  262  may include a pressure sensor (or force sensor) that measures the intensity of touch pressure by the user. The pressure sensor may be implemented integrally with the touch panel  252 , or may be implemented as at least one sensor separately from the touch panel  252 . According to an embodiment, the display  260  may further include a control circuit for controlling the panel  262 , the hologram device  264 , or the projector  266 . 
     The interface  270  may be, for example, the high-definition multimedia interface (HDMI)  272 , the universal serial bus (USB)  274 , the optical interface  276 , or the D-subminiature (D-sub)  278 . The interface  270  may be included, for example, in the communication interface  170  illustrated in  FIG. 1 . Additionally, the interface  270  may further include, for example, a mobile high definition link (MHL) interface, a SD card/multi-media card (MMC) interface, or an infrared data association (IrDA) standard interface. 
     The audio module  280  may convert sounds to electrical signals or vice versa. At least a part of the audio module  280  may be included, for example, in the input/output interface  150  illustrated in  FIG. 1 . The audio module  280  may process, for example, sound information that is input or output through the speaker  282 , the receiver  284 , the earphone  286 , or the microphone  288 . 
     For example, the camera module  291  may shoot a still image or a video. According to an embodiment, the camera module  291  may include image sensors (e.g., a front sensor or a rear sensor), lenses, one or more image signal processors (ISP), and/or a flash (e.g., an LED or a xenon lamp). 
     The power management module  295  may manage, for example, the power of the electronic device  201 . According to an embodiment, a power management integrated circuit (PMIC), a charger IC, or a battery or fuel gauge may be included in the power management module  295 . The PMIC may employ wired or wireless charging methods. The wireless charging method may employ, for example, magnetic resonance charging, magnetic induction charging or electromagnetic charging. The PMIC may further include additional circuits such as coil loops, resonant circuits, rectifiers, or the like. The battery gauge may measure, for example, the remaining capacity of the battery  296  and the voltage, current or temperature thereof while the battery is charged. The battery  296  may be, for example, a rechargeable battery and/or a solar battery. 
     The indicator  297  may display a specified state of the electronic device  201  or a part thereof (e.g., the processor  210 ), such as states when the electronic device  201  is booting state, transmitting/receiving a message, charging state, etc. The motor  298  may convert an electrical signal into a mechanical vibration and may generate vibration, haptic feedback, etc. Although not illustrated, a processing device (e.g., a GPU) for supporting a mobile TV may be included in the electronic device  201 . The processing device for supporting the mobile TV may process media data according to the standards of digital multimedia broadcasting (DMB), digital video broadcasting (DVB), MediaFLO™, or the like. 
     Each of the above-mentioned elements of the electronic device according to various embodiments described in this disclosure may be configured with one or more components, and the names of the elements may be changed according to the type of the electronic device. In various embodiments, the electronic device may include at least one of the above-mentioned elements, and some elements may be omitted or other additional elements may be added. Furthermore, some of the elements of the electronic device according to various embodiments may be combined with each other so as to form one entity, so that the functions of the elements may be performed in the same manner as before the combination. 
       FIG. 3  illustrates a block diagram of a program module, according to one embodiment. 
     According to an embodiment, the program module  310  (e.g., the program  140 ) may include an operating system (OS) to control resources associated with the corresponding electronic device (e.g., the electronic device  101 ), and/or applications (e.g., the application program  147 ) executing on top of the OS. The OS may be, for example, Android, iOS, Windows, Symbian, Tizen, or Bada. 
     The program module  310  may include the kernel  320 , the middleware  330 , the application programming interface (API)  360 , and/or one or more applications  370 . At least a portion of the program module  310  may be preloaded on the electronic device or may be downloadable from an external electronic device (e.g., the electronic device  102  or  104 , the server  106 , or the like). 
     The kernel  320  (e.g., the kernel  141 ) may include, for example, the system resource manager  321  or the device driver  323 . The system resource manager  321  may control, allocate, or retrieve system resources. According to an embodiment, the system resource manager  321  may include a process managing unit, a memory managing unit, a file system managing unit, or the like. The device driver  323  may include, for example, a display driver, a camera driver, a Bluetooth driver, a shared memory driver, a USB driver, a keypad driver, a Wi-Fi driver, an audio driver, or an inter-process communication (IPC) driver. 
     The middleware  330  may provide, for example, functions that the applications  370  needs in common, or may provide various functions to the applications  370  through the API  360  to allow the applications  370  to efficiently use the limited system resources of the electronic device. According to an embodiment, the middleware  330  (e.g., the middleware  143 ) may include at least one of the runtime library  335 , the application manager  341 , the window manager  342 , the multimedia manager  343 , the resource manager  344 , the power manager  345 , the database manager  346 , the package manager  347 , the connectivity manager  348 , the notification manager  349 , the location manager  350 , the graphic manager  351 , the security manager  352 , or the payment manager  354 . 
     The runtime library  335  may include, for example, a library module that is used by a compiler to generate new functions while the application  370  is being executed. The runtime library  335  may perform input/output management, memory management, or arithmetic functions. 
     The application manager  341  may manage, for example, the life cycles of the applications  370 . The window manager  342  may manage the graphic user interface (GUI) resource that is used in the display. The multimedia manager  343  may identify formats necessary for playing back various media files, and may perform encoding or decoding of the media files by using codecs suitable for the formats. The resource manager  344  may manage resources such as storage space, memory, or source code of the applications  370 . 
     The power manager  345  may operate, for example, with the basic input/output system (BIOS) to manage power (e.g. battery power), and may provide power information for operations of the electronic device. The database manager  346  may generate, search for, or modify database that is to be used in at least one application of the applications  370 . The package manager  347  may install or update the application that is distributed in the package file. 
     The connectivity manager  348  may manage, for example, wireless connections such as Wi-Fi or Bluetooth. The notification manager  349  may display or notify an event such as a received message, appointment, or proximity notification. The location manager  350  may manage location information about the electronic device. The graphic manager  351  may manage graphic effects displayed on the display, or manage the user interface relevant thereto. The security manager  352  may provide security functions necessary for system security, such as user authentication or the like. According to an embodiment, in the case where the electronic device (e.g., the electronic device  101 ) can perform telephony functions, the middleware  330  may further include a telephony manager for managing voice or video calls. 
     The middleware  330  may include a middleware module that combines various functions of the above-described elements. The middleware  330  may provide modules specialized for each OS. Additionally, the middleware  330  may dynamically remove a part of existing elements or may add new elements thereto. 
     The API  360  (e.g., the API  145 ) may be, for example, a set of programming functions and may vary depending on the OS. For example, in the case where the OS is Android, it may provide one API set suitable for the Android OS. In the case where the OS is the tizen OS, it may provide two or more API sets. 
     The application(s)  370  (e.g., the application program  147 ) may include, for example, one or more applications such as the home screen  371 , the dialer  372 , the SMS/MMS application  373 , the instant message (IM) application  374 , the browser  375 , the camera  376 , the alarm  377 , the contacts  378 , the voice dial  379 , the e-mail application  380 , the calendar  381 , the media player  382 , the album application  383 , a timepiece (clock application)  384 , the payment application  385 , health care applications (e.g., measuring exercise quantity undertaken by the user, blood sugar, or the like) or environment information applications (e.g., measuring barometric pressure, humidity, temperature, or the like). 
     According to an embodiment, the application  370  may include an application (hereinafter referred to as “information exchanging application” for descriptive convenience) to support information exchange between the electronic device (e.g., the electronic device  101 ) and an external electronic device (e.g., the electronic device  102  or  104 ). The information exchanging application may include, for example, a notification relay application for transmitting specified information to the external electronic device, or a device management application for managing the external electronic device. 
     For example, the notification relay application may perform the function of transmitting notification information, which arises from other applications (e.g., applications for SMS/MMS, e-mail, health care, or environmental information), to an external electronic device (e.g., the electronic device  102  or  104 ). Additionally, the notification relay application may receive, for example, notification information from the external electronic device and provide the notification information to the user. 
     The device management application may manage (e.g., install, delete, or update), for example, at least one function (e.g., turn-on/turn-off of a portion or all of the external electronic device, adjust the brightness or resolution of the display, etc.) of the external electronic device (e.g., the electronic device  102  or  104 ), an application running in the external electronic device, or a service (e.g., call service, message service, or the like) provided by the external electronic device. 
     According to an embodiment, the application  370  may include an application (e.g., a health care application of a mobile medical device) that is assigned in accordance with an attribute of the external electronic device (e.g., the electronic device  102  or  104 ). According to an embodiment, the application  370  may include an application that is received from the external electronic device (e.g., the server  106  or the electronic device  102  or  104 ). According to an embodiment, the application  370  may include a preloaded application or a third party application that is downloadable from a server. The names of elements of the program module  310  according to the embodiment may be modifiable depending on the type of the underlying operating system. 
     According to various embodiments, at least a portion of the program module  310  may be implemented by software, firmware, hardware, or a combination of two or more thereof. At least a portion of the program module  310  may be implemented (e.g., executed), for example, by the processor (e.g., the processor  210 ). At least a portion of the program module  310  may include, for example, modules, programs, routines, sets of instructions, processes, or the like for performing one or more functions. 
       FIG. 4  is a diagram illustrating an electronic device according to one embodiment of the present disclosure. 
     An electronic device  401  according to an embodiment is illustrated in  FIG. 4 . The electronic device  401  may support an active state (or wake-up state) in which a user is able to use functions of the electronic device  401  and an inactive state (or sleep state) in which the user is not manipulating the electronic device  401 . 
     In the active state (or wake-up state), various hardware and/software modules in the electronic device  401  may be supplied with sufficient power from a battery so as to fully perform functions thereof. For example, in the active state, a touchscreen display  410  of the electronic device  401  may be supplied with sufficient power to display various contents and also be capable of detecting various touch inputs or gestures from the user with high sensitivity. 
     In the inactive state (or sleep state), various hardware and/software modules included in the electronic device  401  may be deactivated or may be supplied with minimum power so as to perform only a specified restricted function. As such, since information processing by hardware and/or software modules is suppressed, battery life may be prolonged. For example, in the inactive state, the processor of the electronic device  401  may allow the hardware modules and/or the software modules to perform only specified functions for the inactive state. 
     According to an embodiment, the electronic device  401  illustrated in  FIG. 4  may operate the touchscreen display in the inactive state (or sleep state). For example, the electronic device  401  in the inactive state may output text/images indicating a digital clock, the date, and the battery state (e.g. charge level of the battery) in the first area  411  of the touchscreen display  410 . Also, the electronic device  401  may output various types of GUI objects (or icons) in the second area  412  of the display  410 . The text, images, GUI objects, and the like included in the first area  411  and the second area  412  may be collectively referred to as “AOD content”. 
     According to an embodiment, in the electronic device  401  operating in the inactive state, pixels that form the text, the images, the GUI objects, and the like in the first area  411  and the second area  412  may be displayed in a specified color (e.g., white). According to one embodiment of the present disclosure, the remaining pixels that form the background for the AOD content may be displayed in another specified color (e.g., black). In this example, if the touchscreen display  410  is an organic light-emitting diode (OLED) panel, the pixels forming the background may be OFF. 
     According to an embodiment, the text, the images, the GUI objects, and the like in the first area  411  and the second area  412  may periodically or aperiodically move vertically or horizontally. This is to prevent burn-in of pixels displaying the text, the images, and the GUI objects, such as when the touchscreen display  410  is an organic light-emitting diode (OLED) panel. 
     According to one embodiment of the present disclosure, the electronic device  401  in the inactive state (e.g., sleep state) may sense a touch input to a GUI object in the second area  412  of the touchscreen display  410 . Below, a method for sensing the touch input to the GUI object and an electronic device performing the same will be described with reference to drawings. 
       FIG. 5A  illustrates a block diagram of an electronic device according to one embodiment. 
     Referring to  FIG. 5A , an electronic device  501  according to an embodiment may include a display panel  510 , a display driver integrated circuit (IC) (DDI)  515 , a touch sensor  520 , a touch controller  525 , a haptic actuator  530 , a memory  540 , a processor  550 , a pressure sensor  560 , and a pressure sensor IC  565 . According to an embodiment, the electronic device  501  may include a housing that forms the exterior of the electronic device  501 . The housing may include a first surface (e.g., front surface) and a second surface (e.g. rear surface) opposite the first surface. 
     The display panel  510  may be exposed through an opening or a transparent window of the first surface of the housing and may be interposed between the first surface and the second surface. The display panel  510  may receive an image signal from the display driver integrated circuit (DDI)  515 . The display panel  510  may display a variety of content (e.g., text, images, videos, icons, widgets, symbols, or the like) based on the image signal. In one embodiment, the display panel  510  may include the touch sensor panel  520  and/or a digitizer panel (not illustrated) for recognizing an electronic pen. In this disclosure, an assembly of the display panel  510  and the touch sensor  520  may be referred to as a “touchscreen display”. 
     The display driver integrated circuit (DDI)  515  may be electrically connected with the display panel  510  and may supply image signals corresponding to image data received from the processor  550  to the display panel  510 . Although not illustrated in  FIG. 5A , according to one or more embodiments, the display driver integrated circuit  515  may include a graphics RAM, an interface module, an image processing unit, one or more multiplexers, a display timing controller (T-con), a source driver, a gate driver, and/or one or more oscillator. 
     According to an embodiment, the display driver integrated circuit  515  may supply the image signal to the display panel  510  at a specified frame rate (e.g., 60 frames per second) in the active state (or wake-up state). In this case, the processor  550  may provide image data to the display driver integrated circuit  515  at a relatively high frequency in the active state, compared with when the processor  550  operates in the inactive state (or sleep state). 
     According to an embodiment, in the inactive state (or sleep state), based on image data stored in the embedded graphics RAM, the display driver integrated circuit  515  may provide the image signal corresponding to the image data to the display panel  510  at a relatively low frequency compared with when the electronic device  501  was operating in the active state (or wake-up state). In this case, while operating the inactive state, the processor  550  may temporarily operate in the active state (or wake-up state) to provide the image data to the display driver integrated circuit  515 . Afterwards, the processor  550  may back to the inactive state and thus would no longer affect the internal operations of the display driver integrated circuit  515 . 
     The touch sensor  520  may be interposed between the display panel  510  and the first surface of the housing of the electronic device  501  so that the touch sensor  520  is overlaid with the display panel  510 . Alternatively, the touch sensor  520  may be coupled with the display panel  510 . In the touch sensor  520 , a specified physical quantity (e.g., voltage, light intensity, resistance, amount of electrical charge, capacitance, or the like) may vary when the touch sensor  520  is touched by the user. According to various embodiments, the touch sensor  520  may be referred to using various names, such as touch panel, touch input panel, etc. 
     The touch controller  525  may be electrically connected with the touch sensor  520 , may sense the variation in physical quantity that occurs in the touch sensor  520 , and then may calculate data associated with the touch (e.g., the location (expressed in coordinate data (X, Y)) of the touch) based on the variation in physical quantity. The data associated with the touch may be provided to the processor  550 . 
     According to one embodiment of the present disclosure, if a portion (e.g., a finger) of the user or the tip of an electronic pen makes contact with the touch sensor  520 , capacitance between a transmitting terminal Tx and a receiving terminal Rx in the touch sensor  520  may vary. For example, the variation in the capacitance may be sensed by the touch controller  525 , and the touch controller  525  may provide the coordinate location of the touch to the processor  550 . The processor  550  may process the location data of the touch as an event associated with a user input. 
     According to various embodiments, the touch controller  525  may variously be referred to as a “touch IC”, a “touch screen IC”, a “touch screen controller IC”, etc. According to some embodiments, in an electronic device in which the touch controller  525  is not included, the processor  550  may perform the role of the touch controller  525 . According to another embodiment, the touch controller  525  and the processor  550  may be implemented as one element (e.g., one-chip). 
     The haptic actuator  530  may provide the user with haptic feedback (e.g., vibration) in response to control commands from the processor  550 . For example, when a touch input (e.g., a physical touch, a hovering input, or a “force touch”) is received from the user, the haptic actuator  530  may provide the user with haptic feedback. 
     An audio output module  535  may provide the user with auditory feedback (e.g., sound) in response to control commands from the processor  550 . For example, when a touch input (e.g., a physical touch, a hovering input, and a “force touch”) is received from the user, the audio output module  535  may provide the user with auditory feedback. For example, the audio output module  535  may include a speaker (e.g.,  282  of  FIG. 2 ) and/or an earphone/headset (e.g.,  286  of  FIG. 2 ). 
     The memory  540  may store commands or data associated with operations of elements included in the electronic device  501 . For example, the memory  540  may store an application program for outputting text, images, GUI object, or the like (e.g., see  411  and  412  of  FIG. 4 ) in the inactive state (e.g., sleep state). Also, for example, the memory  540  may store instructions that, when executed, cause the processor  550  and/or the touch controller  525  to perform various operations (e.g.,  FIGS. 6, 9, 10 , etc.) disclosed in this disclosure. 
     In one embodiment, the processor  550  may be electrically connected with the elements  510  to  550  included in the electronic device  501  and may execute operations or data processing associated with control and/or communication of the elements  510  to  550  included in the electronic device  501 . 
     Pressure (or force) by an external object (e.g., a finger or an electronic pen) may be sensed in the pressure sensor  560 . According to an embodiment, the pressure sensor  560  may include a plurality of electrodes (e.g., transmitting terminals Tx and receiving terminals Rx) with dielectric layers interposed therebetween. If pressure from an external object is received, a physical quantity (e.g., capacitance or the like) between the plurality of electrodes may vary. 
     The pressure sensor IC  565  may sense the variation in physical quantity (e.g., capacitance or the like) in the pressure sensor  560  and may calculate pressure based on the variation in physical quantity. The calculated pressure may be provided to the processor  550  together with the touch location detected in the touch sensor  520 . According to various embodiments, the pressure sensor IC  565  may be referred to as a “force touch controller,” a “force sensor IC,” a “pressure panel IC,” etc. Also, according to one embodiment, the pressure sensor IC  565  may be implemented with one element (e.g., one-chip) together with the touch controller  525  and/or the display driver integrated circuit  515 . 
       FIG. 5B  illustrates a touch sensor according to one embodiment. 
     Two types of touch sensors  520 - 1  and  520 - 2  are illustrated in  FIG. 5B . The first touch sensor  520 - 1  may be referred to as a mutual capacitive touch sensor, and the second touch sensor  520 - 2  may be referred to as a self-capacitive touch sensor. Each of the touch sensors  520 - 1  and  520 - 2  may correspond to the touch sensor  520  illustrated in  FIG. 5A . 
     According to an embodiment, the first touch sensor  520 - 1  may include a plurality of first electrode strips  521  and a plurality of second electrode strips  522 . The first electrode strips  521  may be disposed under the second electrode strips  522  in a horizontal direction. The second electrode strips  522  disposed in a vertical direction so that the first electrode strips  521  and the second electrode strips  522  form a lattice shape. For example, in the first touch sensor  520 - 1 , each of the first electrode strips  521  and the second electrode strips  522  may each be formed as a conductive pattern on a sheet. In this case, when assembled, the first electrode strip  521  and the second electrode strip  522  are orthogonal to each other. The touch controller (e.g.,  525  of  FIG. 5A ) may measure capacitance between the first electrode strip  521  and the second electrode strip  522  at a predetermined frequency. 
     According to another embodiment, the second touch sensor  520 - 2  may include a plurality of first electrode patches  523  and a plurality of second electrode patches  524 . Each of the first electrode patches  523  may be disposed below each of the second electrode patches  524 . Each of the first electrode patches  523  and the second electrode patches  524  may have substantially the same size. The first electrode patches  523  and the second electrode patches  524  may be shaped as an array. For example, in the second touch sensor  520 - 2 , the first electrode patches  523  and the second electrode patches  524  may each be formed as a conductive array on a sheet. In this case, when assembled, each of the first electrode patches  523  and its corresponding second electrode patches  524  may be disposed to face each other. According to an embodiment, the touch controller may measure capacitance between the first electrode patch  523  and the second electrode patch  524  at a predetermined frequency. 
     According to an embodiment, in the first touch sensor  520 - 1  and the second touch sensor  520 - 2  above described, the first electrode  521 / 523  and the second electrode  522 / 524  may be formed on separate sheets (e.g., separate flexible printed circuit boards (FPCBs)) or may be respectively formed on opposite surfaces of a single sheet. Spacers may be disposed between the first electrode  521 / 523  and the second electrode  522 / 524 , and any one of the first electrode  521 / 523  and the second electrode  522 / 524  may be connected to an internal common ground of the electronic device. 
     For example, a user touch may not exist at the area C 1 , in which an n-th first electrode strip  521 - n  and an m-th second electrode strip  522 - m  of the first touch sensor  520 - 1  cross each other, and at the area C 2  corresponding to a first electrode patch  523 ( x,y ) and a second electrode patch  524 ( x,y ) that are disposed at the x-th row and y-th column of the second touch sensor  520 - 2 . Preset (default) capacitance Ca may be formed at the area C 1  and the area C 2 . The capacitance Ca may be sensed by the touch controller at the predetermined frequency. 
     Meanwhile, user touches  51  and  52  may be made at the area D 1 , in which a q-th first electrode strip  521 - q  and a p-th second electrode strip  522 - p  of the first touch sensor  520 - 1  cross each other, and at the area D 2  corresponding to a first electrode patch  523 ( i,j ) and a second electrode patch  524 ( i,j ) that are disposed at the i-th row and j-th column of the second touch sensor  520 - 2 . In this case, in the areas D 1  and D 2 , capacitance between electrodes may vary due to the user touches  51  and  52 . Specifically, capacitance between the first electrode strip  521 - q  and the second electrode strip  522 - p  and capacitance between the first electrode patch  523 ( i,j ) and the second electrode patch  524 ( i,j ) may increase from Ca to Ct when the user touches  51  and  52  occur. The touch controller may sense the touches  51  and  52  by sensing the increase in the capacitance. 
       FIG. 6A  is a block diagram of a touch sensor according to one embodiment. 
     Referring to  FIG. 6A , an electronic device  601  according to an embodiment may include a touchscreen display  610 , a display driver integrated circuit (DDI)  620 , a touch controller  630  including a register  640  (in detail, refer to  FIG. 7B ), and a processor  650 . The register  640  may be implemented as a non-volatile memory. The electronic device  601  may correspond to the electronic device illustrated in  FIGS. 1 to 5A , and a description that is the same or similar as the description given with reference to  FIGS. 1 to 5A  may be omitted. 
     The touchscreen display  610  may include a display panel (e.g.,  510  illustrated in  FIG. 5 ) and a touch sensor (e.g.,  520  illustrated in  FIG. 5 ). Accordingly, for example, content (e.g. text, images, GUI objects, or the like) that is output to the touchscreen display  610  may be understood as content that is outputted to the display panel included in the touchscreen display  610 . Also, a detected touch to the touchscreen display  610  may be understood as a touch detected by the touch sensor included in the touchscreen display  610 . 
     According to an embodiment, the processor  650  may interact with the display driver integrated circuit  620 . For example, the processor  650  may provide image data of the AOD content (e.g., text, images, GUI objects, or the like) to be output in at least a partial area (e.g., the first area  611  and/or the second area  612 ) of the touchscreen display  610 . The image data of the AOD content may be stored in a graphics RAM (GRAM)  625  included in the display driver integrated circuit  620 . While operating the inactive state, the processor  650  may temporarily operate in the active state (or wake-up state) to provide the image data to the graphics RAM (GRAM)  625 . After provision of the image data, the processor  650  may enter back to the inactive state (or sleep state). 
     The processor  650  may provide the image data to the graphics RAM (GRAM)  625 , for example, periodically or aperiodically due to external events. For example, the processor  650  may periodically provide image data (e.g., including the digital clock image) to the graphics RAM (GRAM)  625 . In this case, the frequency at which the processor  650  provides image data to the graphics RAM (GRAM)  625  may be lower than the frame rate of the touchscreen display  610 . For another example, when a notification occurs, the processor  650  may provide image data (e.g., an icon image of an IM application) indicating the notification to the graphics RAM (GRAM)  625  immediately or shortly after the notification occurrence. 
     According to an embodiment, the display driver integrated circuit  620  may store the image data provided from the processor  650  in the graphics RAM (GRAM)  625 . The display driver integrated circuit  620  may convert the image data stored in the graphics RAM (GRAM)  625  into an image signal depending on internal settings or control information received from the processor  650 . Since the image signal is supplied to the touchscreen display  610  (i.e. the display panel included in the touchscreen display  610 ) by the display driver integrated circuit  620 , the AOD content (text, images, GUI objects, or the like) may be output in at least a partial area (e.g., the first area  611  and the second area  612 ) of the touchscreen display  610 . 
     For example, the display driver integrated circuit  620  may receive image data such as icons, numbers, images, or the like from the processor  650  in the active state (or wake-up state). The processor  650  may then enter the inactive state (or sleep state) after providing the image data to the display driver integrated circuit  620 . In the inactive state (or sleep state), the display driver integrated circuit  620  may combine the various icons, numbers, images, or the like included in image data to generate an image signal based on control information (e.g., control information indicating notification content) received from the processor  650 . The display driver integrated circuit  620  may then output and/or update the touchscreen display  610  with the image signal by its own operation. 
     According to an embodiment, the processor  650  may interact with the touch controller  630 . The processor  650  may write data associated with an area (hereinafter referred to as a “touch recognition area,” e.g., the second area  612 ) in the register  640  of the touch controller  630 . The touch recognition area is a partial area of the touch sensor that is configured to detect (effective) touch inputs while the electronic device is in the inactive state. The processor  650  may temporarily operate in the active state (or wake-up state) to write data associated with the touch recognition area (e.g., the second area  612 ) in the register  640 . The processor  650  may enter the inactive state (or sleep state) after writing the data in the register  640 . 
     According to an embodiment, the data associated with the touch recognition area (e.g., the second area  612 ) may include width and height data for the specified area, and include coordinate data (X offset , Y offset ) associated with one point to define a circumference of the touch recognition area. According to one embodiment, the touch recognition area may include a plurality of touch recognition areas, and data associated with the plurality of touch recognition areas may be written in the register  640  as an array or a table. 
     According to an embodiment, the processor  650  may write the data associated with the touch recognition area in the register  640  periodically or aperiodically due to external events. For example, the data associated with the touch recognition area (e.g., the second area  612 ) may be updated periodically or aperiodically to synchronize with the location of content displayed in the second area  612 . 
     According to an embodiment, the touch controller  630  may determine whether an effective touch is sensed in the touch recognition area (e.g., the second area  612 ) based on the data about touch recognition area (e.g., the second area  612 ) written in the register  640 . In contrast, in the inactive state, touches on the touch screen outside the touch recognition area (e.g., the second area  612 ) are non-effective. Further, in some embodiments, as will be described later, some touches inside of touch recognition area (e.g., the second area  612 ) may not be recognized as effective touches for avoiding recognition of unintended touches. If it is determined that the effective touch is sensed in the touch recognition area (e.g., the second area  612 ), the touch controller  630  may write data (e.g., location coordinate data of the effective touch or the like) associated with the effective touch in the register  640  and may provide an interrupt to the processor  650 . Each of the above-described operations of the touch controller  630  may be performed by a gesture engine  635  (software) embedded in an IC constituting the touch controller  630 . 
     The processor  650  may read data associated with the effective touch from the register  640  in response to the interrupt from the touch controller  630 . According to an embodiment, the processor  650  may identify the GUI object displayed at the location corresponding to the location of the effective touch. Afterwards, according to one embodiment, the processor  650  may apply a specified graphic effect to the identified GUI object and/or may execute an application program corresponding to the identified GUI object. 
     According to an embodiment, in the inactive state, the touch controller  630  may drive the touch sensor at a first frequency. But if a touch is sensed in the touch sensor, the touch controller  630  may drive the touch sensor at a second frequency higher than the first frequency, so that the touch sensor can more accurately detect an effective touch (in detail, refer to  FIG. 7A ). 
     According to an embodiment, the touch controller  630  may recognize various types of effective touches depending on settings of the register  640 . For example, the types of effective touches are initially defined in the register  640 . For another example, the processor  650  may write data indicating types of the effective touch in locations of the register  640  (e.g., refer to  743 - 1  to  743 -N of  FIG. 7B ). When a touch is recognized, the touch controller  630  may determine whether an effective touch of a specific type is sensed, with reference to data indicating the type written in the register  640 . 
     For example, when a double touch (or a double tap) is designated and enabled as the effective touch, type data corresponding to the double touch may be stored in a storage space (e.g., refer to  743 - 1  of  FIG. 7B ) of the register  640 . Thereby, the touch controller  630  may recognize a double touch (or a double tap) on the touchscreen display  610  as the effective touch. Also, for example, when a long press (i.e., a touch down made during a specified time or more) is designated and enabled as the effective touch, type data corresponding to the long press may be stored in another storage space (e.g., refer to  743 - 2  of  FIG. 7B ) of the register  640 . Thereby, the touch controller  630  may recognize a long press on the touchscreen display  610  as the effective touch. Preferably, but not limited to, a single tap may not be is designated as the effective touch for avoiding unintended touches in some situations (e.g., touching or grabbing the electronic device  601  in the user&#39;s pocket). 
     Also, as described above, the processor  650  may read data associated with the effective touch from the register  640  and may identify the GUI object corresponding to the effective touch. Afterwards, the processor  650  may execute an application program corresponding to the identified GUI object. 
     According to an embodiment, the effective touch (e.g., a double touch, a long press, or the like) may include at least one touch down and at least one touch release. Before the touch controller  630  according to an embodiment executes the application program corresponding to the identified GUI object, the touch controller  630  may write data indicating the at least one touch down or the at least one touch release in the register  640 . Upon detecting an effective touch, the touch controller  630  may provide an interrupt to the processor  650 . The processor  650  may apply a specified graphic effect (e.g., color inversion of the identified GUI object or temporary enlargement/reduction of the identified GUI object) to the identified GUI object in response to the interrupt. 
       FIG. 6B  illustrates touch recognition by a touch sensor according to one embodiment. 
     Referring to  FIG. 6B , the touchscreen display  610 - s  may include a self-capacitive touch sensor, and the touchscreen display  610 - m  may include a mutual capacitive touch sensor (refer to  FIG. 5B  with regard to a detailed description of the self-capacitive touch sensor and the mutual capacitive touch sensor). Meanwhile, data associated with a specified area (i.e., the touch recognition area)  612  for sensing an effective touch in the touchscreen displays  610 - s  and  610 - m  may be in advance stored in the register included in a touch controller (refer to  741  of  FIG. 7B ). 
     According to an embodiment, in the touchscreen display  610 - s  including the self-capacitive touch sensor, the touch controller may activate only the touch recognition area  612  and may deactivate the remaining area. For example, the touch controller may scan only the capacitance value of electrode patches corresponding to the touch recognition area  612 . The touch controller may not scan capacitance values of the electrode patches outside the touch recognition area  612 . 
     According to an embodiment, in the touchscreen display  610 - m  including the mutual capacitive touch sensor, the touch controller may activate only the touch recognition area  612 . To this end, the touch controller may scan capacitance values between longitudinal electrode strips corresponding to a width “W” of the touch recognition area  612  and transverse electrode strips corresponding to a height “H” of the touch recognition area  612 . Since the touch controller scans only the capacitance value between the transverse electrode strip corresponding to the width “W” and the longitudinal electrode strip corresponding to the height “H”, the touch controller may not scan capacitance values outside the touch recognition area  612 . 
     According to touchscreen displays  610 - s  and  610 - m  illustrated in  FIG. 6B , the touch controller may activate the hardware corresponding to the touch recognition area  612  and may deactivate the remaining area. Accordingly, it may be possible to reduce power consumption by the touch screen in the inactive state but at the same time allowing the touch screen to be capable of detecting effective touches. However, activation of the touch recognition area  612  illustrated in  FIG. 6B  is an example. The disclosed invention is not so limited. For example, the touch controller may activate the entire area of the touch sensor and may not report touches detected from the non-touch recognition area to the processor. Doing so would accomplish the same effect as the example illustrated in  FIG. 6B . 
       FIG. 6C  illustrates movement of a touch recognition area according to one embodiment. 
     According to an embodiment, when the electronic device is in the inactive state, AOD content (e.g., a digital clock, a GUI object, or the like) displayed in the first area  611  and the second area  612  may move vertically or horizontally depending on operations of a touch-display driver integrated circuit (TDDI)  660 . The TDDI  660  may comprise the corresponding component to the DDI  515  and the corresponding component to the touch controller  525 . The AOD content may be moved to prevent burn-in of pixels in touchscreen displays  610 - 1 ,  610 - 2 , and  610 - 3 . The TDDI  660  illustrated in  FIG. 6C  may refer to a single chip in which the display driver integrated circuit  620  and the touch controller  630  are integrated. 
     For example, referring to the touchscreen display  610 - 1 , the digital clock, the date, the battery state, and the like may be displayed in the first area  611  as the AOD content, and five GUI objects (e.g., icons) may be displayed in the second area  612 . To this end, the display driver integrated circuit  620  included in the TDDI  660  may automatically output and/or update content displayed in the first area  611  and/or the second area  612  based on image data stored in a graphics RAM (GRAM). 
     According to an embodiment, the second area  612  may correspond to the touch recognition area. To recognize a touch in the second area  612 , the touch controller  630  included in the TDDI  660  may obtain a display range of the second area  612  from the display driver integrated circuit  620  and may write the obtained result in a register as the touch recognition area. That is, the TDDI  660  may synchronize the AOD content output area in the second area  612  and the touch recognition area through its own processing. 
     According to an embodiment, the TDDI  660  may automatically move the AOD content displayed in the first area  611  and the second area  612  vertically or horizontally. For example, the TDDI  660  may horizontally move AOD content output in the first area  611  and/or the second area  612  at regular intervals in the daytime and may vertically move the AOD content at night, also at regular intervals. The reason is that the vision of a human is more sensitive to vertical movement than to horizontal movement. For another example, the distance that the first area  611  and/or the second area  612  moves is less in the daytime compared to at night. The reason is that the electronic device  601  is generally used more frequently in the daytime than in night. 
     For example, referring to the touchscreen display  610 - 2 , the display driver integrated circuit  620  of the TDDI  660  may display AOD content above the previous position (as shown in  610 - 1 ). As the display location of the second area  612  including AOD content moves, the touch controller  630  may obtain the display range of the second area  612  from the display driver integrated circuit  620  and may update the touch recognition area stored in the register based on the obtained display range. As such, the AOD content output area in the second area  612  and the touch recognition area may be synchronized and may overlap. As in the above description, after a predetermined interval, as illustrated in the touchscreen display  610 - 3 , the AOD content displayed in the first area  611  and the second area  612  may be moved again upward. 
     According to one embodiment, before switching into the inactive state, the processor may write data (hereinafter referred to as “time data”) specifying the regular intervals for moving the AOD content into the register. The touch controller  630  may move the touch recognition area (e.g., the second area  612 ) at a time that the time data indicates. 
       FIG. 7A  illustrates an operation of a touch controller in an inactive state (e.g., sleep state), according to one embodiment. 
     How the touch controller  630  recognizes a touch while being in the inactive state (e.g., sleep state) is illustrated in  FIG. 7A . According to an embodiment, in the inactive state (or sleep state), the touch controller  630  may operate in a low power mode (LPM). The low power mode LPM of the touch controller  630  may include a low power idle (LPI) mode (hereinafter referred to as an “LPI mode”) and a low power active (LPA) mode (hereinafter referred to as an “LPA mode”). Below, reference numerals of  FIG. 6A  will be used to describe  FIG. 7A . 
     According to an embodiment, before a first touch  71  is recognized (t&lt;t 0 ), the touch controller  630  may operate in the LPI mode. In the LPI mode, the touch controller  630  may drive the touch sensor of the touchscreen display  610  at a scan rate of a first frequency (e.g., 40 Hz). For example, in the LPI mode, the touch controller  630  may measure self-capacitance or mutual-capacitance of the touch sensor at the first frequency. In this case, to reduce current consumption, the touch controller  630  may deactivate various filters (e.g., noise prevention filters, etc.) for calculating a touch input. 
     If the first touch  71  is made at a time point t 0 , the touch controller  630  may additionally have an additional LPI frame t 1  to t 2  of 25 ms, as “debounce”, after the LPI frame t 0  to t 1  of 25 ms. The debounce frame t 1  to t 2  may refer to a time interval that is set to determine whether the first touch  71  is made by the user or by noise. According to another embodiments, the debounce frame t 1  to t 2  may be omitted, meaning the debounce frame may be optional. 
     After the debounce frame t 1  to t 2 , the touch controller  630  may have a change time t 2  to t 3  of about 2 to 3 ms to switch into the LPA mode. 
     The touch controller  630  may operate in the LPA mode from the time point t 3 . In the LPA mode, the touch controller  630  may drive the touch sensor at a scan rate of a second frequency higher than the first frequency. In this case, the touch controller  630  may activate various filters included in the touch controller  630  in order to more exactly calculate the touch location of a touch. 
     For example, the touch controller  630  operating in the LPA mode may determine whether the first touch  71  is a touch from the user, during the LPA frame t 3  to t 4  of 16.66 ms. The LPA frame t 3  to t 4  may be referred to as an “island detect frame.” If it is determined at the LPA frame t 3  to t 4  that the first touch  71  is not made in the touch recognition area (e.g., the second area  612  of  FIG. 6 ), the first touch  71  is not considered for determining an effective touch and touch controller  630  may enter the LPI mode again. 
     However, when it is determined that the first touch  71  is an effective touch by the user (i.e. when the first touch  71  is in the touch recognition area), the touch controller  630  operating in the LPA mode may calculate the location coordinate of the first touch  71  during a time period t 4  to t 5  by using the appropriate algorithm. 
     A single touch (e.g., the first touch  71 ) is used as an example in  FIG. 7A . However, embodiments of the present disclosure may not be limited thereto. According to various embodiments, the effective touch may include a double touch or a long press. For example, when the effective touch is specified to have to be a double touch, only when a second touch is additionally sensed within a specified time (e.g., about 500 ms) from t 5  of  FIG. 7A , the touch controller  630  may determine that the effective touch is recognized. Also, for example, when the effective touch is specified to have to be a long press, only when the first touch  71  is consecutively sensed until a specified time elapses from t 5  of  FIG. 7A , the touch controller  630  may determine that the effective touch is recognized. Meanwhile, according to one embodiment, if it is determined that the effective touch is not recognized, the touch controller  630  may immediately enter the LPI mode or may enter the LPI mode after a predetermined time period (e.g. 3 seconds). 
       FIG. 7B  illustrates a register of a touch controller according to one embodiment. 
     A register  740  according to an embodiment is illustrated in  FIG. 7B . For example, the register  740  may correspond to the register  640  of  FIG. 6A . For example, the register  740  may be implemented with a volatile memory, a nonvolatile memory, or a combination thereof. According to various embodiments, the register  740  may be simply referred to as a “memory.” 
     The register  740  may provide storage space where data are written or read by a processor ( 650  of  FIG. 6 ) or a touch controller ( 630  of  FIG. 6 ). For convenience of description, reference numerals of  FIG. 6  will be used to describe  FIG. 7B . Also, various storage spaces are illustrated in  FIG. 7B  as examples. 
     According to an embodiment, data associated with the touch recognition area may be written in the storage space  741  by the processor  650 . For example, the data may include width data “W” and height data “H” of the touch recognition area, or coordinate data (X offset , Y offset ) associated with one point to define a circumference of the touch recognition area. The coordinate data (X offset , Y offset ), the width data “W”, and height data “H” may be expressed with several bytes and identify certain the pixels in the touchscreen display  610 . 
     According to an embodiment, data associated with an effective touch may be written in the storage space  742  by the touch controller  630 . The data about the effective touch written in the storage space  742  may be read by the processor  650 . For example, the data associated with the effective touch may include coordinate data (Xt, Yt) of the location where the effective touch was made (in detail, refer to  FIG. 8A ). The coordinate data (Xt, Yt) may be expressed with several bytes and identify certain pixels included in the touchscreen display  610 . As another example, the data associated with the effective touch may include identification information ICON_ID of a division area within the touch recognition area where the effective touch was made (in detail, refer to  FIG. 8B ). 
     According to an embodiment, data indicating types of the effective touch may be written in the storage spaces  743 - 1 ,  743 - 2 , . . . , and  743 -N by the processor  650 . For example, the types of the effective touch may include a double touch including a first touch and a second touch, a touch down (i.e., a long press) made for at least a specified time duration, etc. The types of the effective touch may not be limited to the double touch and the long press. For example, the types of the effective touch may also include a touch (a so-called “force touch”) of specified pressure or higher and a proximity touch (e.g., a hovering input or the like). 
     For example, the storage space  743 - 1  may be a storage space for enabling a double touch as an effective touch. In this case, the processor  650  may write specific data in the storage space  743 - 1  such that a double touch can be recognized as an effective touch. As such, if the double touch is recognized with reference to the storage space  743 - 1 , the touch controller  630  may determine that an effective touch is sensed. 
     As in the above description, the storage space  743 - 2  may be a storage space for enabling a long press as an effective touch. In this case, the processor  650  may write specific data in the storage space  743 - 2  such that a long press can be recognized as an effective touch. As such, if the long press is recognized with reference to the storage space  743 - 2 , the touch controller  630  may determine that an effective touch is sensed. 
     According to an embodiment, data indicating a touch down and data indicating a touch release may be respectively written in a storage space  744 - 1  and a storage space  744 - 2  by the touch controller  630 . For example, the touch controller  630  may recognize at least one touch down and at least one touch release included in an effective touch (e.g., a double touch or a long press), may store the recognized results in the storage space  744 - 1  and the storage space  744 - 2 , and may provide an interrupt to the processor  650 . The processor  650  may read the storage space  744 - 1  and the storage space  744 - 2  in response to the interrupt. The processor  650  may determine a touch down and/or a touch release based on the read result and may apply a specified graphic effect (e.g., color inversion) to a GUI object corresponding to the effective touch. 
       FIG. 8A  illustrates recognition of an effective double touch according to an embodiment. 
     A specified area  801   a  for sensing an effective double touch while the electronic device is in the inactive state (e.g., sleep state) is illustrated in  FIG. 8A . The specified area  801   a  may correspond to the second area  412  illustrated in  FIG. 4  or the second area  612  illustrated in  FIG. 6 . To recognize a double touch as the effective touch, data for enabling the double touch may have been written in the storage space  743 - 1  illustrated in  FIG. 7B . 
     According to an embodiment, a touch controller may determine the specified area  801   a  based on data stored in a specified storage space (e.g., the storage space  741  of  FIG. 7B ) of the register of the touch controller. For example, top-left coordinate data (Xa, Ya) of the specific area  801   a , width Wa of the specified area  801   a , and height Ha of the specified area  801   a  may be included in the specified storage space (e.g., the storage space  741  of  FIG. 7B ) of the register. 
     Also, according to an embodiment, GUI objects  811   a ,  812   a ,  813   a ,  814   a , and  815   a  may be displayed in the specified area  801   a . Each of the GUI objects  811   a  to  815   a  may be an application icon. 
     For example, the user may perform a double touch  8   a  on the GUI object  811   a  to execute the application corresponding to the GUI object  811   a . The double touch  8   a  may have a first touch  81   a  and second touch  82   a . If the distance D 1  between the location of the first touch  81   a  and the location of the second touch  82   a  is not greater than a specified distance D 0 , the touch controller may determine that the double touch  8   a  is an effective touch. 
     If the touch controller determines the double touch  8   a  as an effective touch, the touch controller may write location coordinate data (Xt, Yt) corresponding to the first touch  81   a  in a specified storage space (e.g., the storage space  742  of  FIG. 7B ) as data associated with the effective touch. The touch controller may then transmit an interrupt to a processor. 
     In response to the interrupt, the processor may read the location coordinate data (Xt, Yt) corresponding to the first touch  81   a  from the specified storage space (e.g., the storage space  742  of  FIG. 7B ) of the register. Next, the processor may identify that the GUI object  811   a  corresponds to the coordinate data (Xt, Yt) and may execute an application corresponding to the GUI object  811   a.    
     In contrast, if the distance D 1  between the location of the first touch  81   a  and the location of the second touch  82   a  is greater than the specified distance D 0 , if the second touch  82   a  is not sensed within a preset time interval after the detection of the first touch  81   a , or if the second touch  82   a  is not detected within the specified area  801   a , the touch controller may determine that the double touch  8   a  is a non-effective touch. 
       FIG. 8B  illustrates recognition of an effective double touch according to another embodiment. 
     A specified area  801   b  for sensing an effective double touch while the electronic device is in the inactive state (e.g., sleep state) is illustrated in  FIG. 8B . The specified area  801   b  may correspond to the second area  412  illustrated in  FIG. 4  or the second area  612  illustrated in  FIG. 6 . To recognize a double touch as the effective touch, data for enabling the double touch may have been written in the storage space  743 - 1  illustrated in  FIG. 7B . 
     According to an embodiment, a touch controller may determine the specified area  801   b  based on data stored in a specified storage space (e.g., the storage space  741  of  FIG. 7B ) of the register of the touch controller. For example, top-left coordinate data (Xb, Yb) of the specified area  801   b , width Wb of the specified area  801   b , and height Hb of the specified area  801   b  may be included in the specified storage space (e.g., the storage space  741  of  FIG. 7B ) of the register. 
     According to an embodiment, the specified area  801   b  may include a plurality of division areas. For example, the specified area  801   b  may be divided into a first division area including the GUI object  811   b , a second division area including the GUI object  812   b , a third division area including the GUI object  813   b , a fourth division area including the GUI object  814   b , and a fifth division area including the GUI object  815   b.    
     According to an embodiment, the specified area  801   b  may be divided into the first division area to the fifth division area based on the number (e.g., 5) of GUI objects included in the specified area  801   b . For example, a processor may specify the number (e.g., 5) of GUI objects in a register, and the touch controller may distinguish the first division area to the fifth division area by dividing the width Wb (or the height Hb) of the specified area  801   b  by the number (e.g., 5) of GUI objects. 
     For example, the user may perform a double touch ( 8   b ) on the GUI object  812   b  to execute an application corresponding to the GUI object  812   b . If the location of the first touch  81   b  of the double touch  8   b  and the location of the second touch  82   b  are in the same division area, the touch controller may determine that the double touch  8   b  is an effective touch. 
     If the touch controller determines the double touch  8   b  as an effective touch, the touch controller may write location coordinate data corresponding to the first touch  81   b  in a specified storage space (e.g., the storage space  742  of  FIG. 7B ) as data associated with the effective touch. If the touch controller may then transmit an interrupt to a processor. 
     According to another embodiment, if the touch controller determines the double touch  8   b  as an effective touch, the touch controller may write identification information ICON_ID_ 2  of the second division area including the GUI object  812   b  in a specified storage space (e.g., the storage space  742  of  FIG. 7B ) of the register as data associated with an effective touch. Afterwards, the touch controller may transmit an interrupt to the processor. 
     In response to the interrupt, the processor may read the coordinate data of the location corresponding to the first touch  81   b  or the identification information ICON_ID_ 2  of the second division area from the specified storage space (e.g., the storage space  742  of  FIG. 7B ). Next, the processor may identify the GUI object  812   b  corresponds to the coordinate data of the first touch  81   b  or the identification information ICON_ID_ 2 . Accordingly, the processor may execute an application corresponding to the GUI object  812   b.    
     In contrast, if the location of the first touch  81   b  and the location of the second touch  82   b  is not within the same division area, if the second touch  82   b  is not sensed within a preset time interval after the detection of the first touch  81   b , or if the second touch  82   b  is not detected within than the specified area  801   b , the touch controller may determine that the double touch  8   b  is a non-effective touch. 
       FIG. 8C  illustrates recognition of an effective double touch according to yet another embodiment. 
     Referring to  FIG. 8C , while the electronic device is in the inactive state (e.g., sleep state), GUI objects  811   c ,  812   c ,  813   c ,  814   c , and  815   c  may be displayed in an area  801   c . Also, to allow for the touch controller to recognize a double touch to the GUI objects  811   c  to  815   c  as an effective touch, for example, data for enabling the double touch may have been written in the storage space  743 - 1  illustrated in  FIG. 7B . 
     According to an embodiment, a touch controller may determine a specified touch recognition area  801   c _touch based on data stored in a specified storage space (e.g., the storage space  741  of  FIG. 7B ) of the register of the touch controller. For example, top-left coordinate data (Xc_touch, Yc_touch) of the specific touch recognition area  801   c _touch, width Wc_touch of the specified touch recognition area  801   c _touch, and height Hc_touch of the specified touch recognition area  801   c _touch may be included in the specified storage space (e.g., the storage space  741  of  FIG. 7B ) of the register. The touch recognition area  801   c _touch may be larger than the area  801   c  in which the GUI objects  811   c  to  815   c  are displayed by distance W e  at the right and at the left and by distance H e  at the top and at the bottom. According to an embodiment, the distances W e  and H e  may be determined, for example, depending on the geometries of the electrode strips or electrode patches included in a touch sensor. For example, H e  may represent one to five rows of electrode strips or electrode patches. 
     As described with reference to  FIG. 8A , when the area  801   c  including the GUI objects  811   c  to  815   c  coincides with the touch recognition area  801   c _touch (i.e.,  801   c = 801   c _touch), touch detection errors may occur. For example, the user may perform a touch down at point  81   c  on the GUI object  815   c . Within a specific time interval (e.g., 500 ms), the user may move his finger to point  82   c  while maintaining the touch. Thereafter, the user may move his finger back to point  81   c . In this case, because the area  801   c  overlaps with area  801   c _touch, and no touches are detected beyond the boundaries of  801   c , the electronic device may perceive this gesture as two distinct touch down events, and thus recognize it as a double touch. That is, due to the restricted range of the touch recognition area  801   c , the electronic device may erroneously detect an invalid touch gesture as a valid effective touch. 
     However, as illustrated in  FIG. 8C , as the touch recognition area  801   c _touch is expanded, the electronic device may recognize the entirety of the user&#39;s finger movements. That is, since the touch recognition area  801   c _touch is expanded, erroneous touch detection may be avoided. 
       FIG. 9A  is a flowchart illustrating a touch recognition method according to one embodiment. 
     Referring to  FIG. 9A , the touch recognition method according to an embodiment may include operation  901  to operation  909 . Operation  901  to operation  909  may be performed by, for example, the electronic device illustrated in  FIGS. 1 to 6A . For example, operation  901  to operation  909  may be implemented as instructions (commands) stored in a computer-readable recording medium or a memory. Hereinafter, the reference numerals of  FIG. 6A  will be used to describe operation  901  to operation  909 , and a description that is the same or similar as described with reference to  FIG. 6A  may not be repeated here. 
     In operation  901 , the electronic device  601  may enter the inactive state (e.g., sleep state). In the inactive state (or sleep state), various hardware and/software modules included in the electronic device  601  may be deactivated or may perform only specified restricted functions. For example, the camera module in the electronic device  601  may be deactivated in the inactive state (e.g., sleep state), and the display driver integrated circuit  620 , the touch controller  630 , and the processor  650  may perform only specified restricted AOD functions in the inactive state (e.g., sleep state). 
     For example, in the inactive state (or sleep state), the display driver integrated circuit  620  may output a digital clock, a date, and a battery state in the first area  611  and may output a plurality of GUI objects in the second area  612  in the AOD mode. The display driver integrated circuit  620  that operates in the inactive state (or sleep state) may supply an image signal to the touchscreen display  610  at a driving frequency that is lower than that in the active state (or wake-up state). 
     For another example, in the inactive state (or sleep state), the touch controller  630  may sense a touch on the touchscreen display  610  at a touch scan rate of a frequency that is lower than in the active state (or wake-up state). In the inactive state (or sleep state), the touch controller  630  may provide data (e.g., coordinate data of a location at which a touch is made) associated with a sensed touch to the processor  650  at a frequency (report rate) that is lower than in the active state (or wake-up state). 
     In operation  903 , the processor  650  of the electronic device  601  may temporarily operate in the active state (or wake-up state) and may write data associated with a specified area (e.g., the second area  612 ) for sensing an effective touch in the register  640 . The data associated with the specified area (e.g., the second area  612 ) may include, for example, width data “W” and height data “H” of the specified area (e.g., the second area  612 ), or coordinate data (X offset , Y offset ) associated with one point to define a circumference of the specified area (e.g., the second area  612 ). According to another embodiment, the specified area for sensing the effective touch may include a plurality of areas. The processor  650  may switch into the inactive state (or sleep state) after writing the data in the register  640 . 
     In operation  905 , while in the inactive state (e.g., sleep state), the touch controller  630  may determine whether an effective touch is sensed in the specified area (e.g., the second area  612 ) of the touchscreen display  610 . If it is determined that the effective touch is sensed in the specified area (e.g., the second area  612 ), the touch controller  630  may perform operation  907 ; otherwise, the touch controller  630  may again perform operation  905 . 
     According to an embodiment, in operation  905 , the touch controller  630  may drive a touch sensor included in the touchscreen display  610  at a first frequency. If a touch is sensed in the touch sensor, the touch controller  630  may drive the touch sensor at a second frequency higher than the first frequency and may determine whether the effective touch is sensed. 
     According to an embodiment, in operation  905 , the touch controller  630  may recognize various types of effective touches depending on data stored in the register  640  (e.g.,  743 - 1 ,  743 - 2  as shown  FIG. 7B ). The touch controller  630  may determine whether a received touch is an effective touch based on data indicating types of effective touches written into the register. For example, the type of the effective touch may include a double touch, a long press, and the like. 
     Since it is determined that the effective touch is sensed in the specified area (e.g., the second area  612 ), in operation  907 , the touch controller  630  may write data associated with the effective touch in the register  640 . For example, the data associated with the effective touch may correspond to location coordinate data (refer to  FIG. 8A ) of the effective touch is made or identification information (refer to  FIG. 8B ) of a division area where the effective touch occurred. 
     In operation  909 , the processor  650  may read data about the effective touch written in operation  907  from the register  640 . Afterwards, the processor  650  may identify a GUI object in the specified area (e.g., the second area  612 ) based on the data associated with the effective touch. The processor  650  may apply a specified graphic effect to the identified GUI object and/or may execute an application program corresponding to the identified GUI object. 
       FIG. 9B  is a flowchart illustrating a touch recognition method according to another embodiment. 
     Referring to  FIG. 9B , the touch recognition method according to an embodiment may include operation  902  to operation  906 . Operation  902  to operation  906  may be executed by, for example, the electronic devices illustrated in  FIGS. 1 to 6 . For example, operation  902  to operation  906  may be implemented as instructions (commands) stored in a computer-readable recording medium or a memory. Hereinafter, the reference numerals of  FIG. 6A  will be used to describe operation  902  to operation  906 , and a description that is the same or similar as described with reference to  FIG. 6A  may not be repeated here. 
     In operation  902 , when the processor  650  of the electronic device  601  may store first data (e.g., image data) in a first memory (e.g., the graphics RAM  625 ) included in the display driver integrated circuit  620  for later use in the inactive state or sleep state. The first data may be associated with a graphic user interface (GUI) to be displayed in a partial area of the display  610 . For example, the GUI may include GUI elements (e.g., icons or the like) of an application program. For another example, when the processor  650  is in the inactive state or sleep state, the remaining area of the display  610  other than the area in which the GUI is displayed may be turned off or be displayed as a black background. 
     In operation  904 , the processor  650  may store second data (e.g., data associated with an area for recognizing an effective touch) in a second memory (e.g., the register  640 ) of the touch controller  630 . The second data may be associated with the partial area of the display  610 . 
     In operation  906 , the processor  650  may store the first data (e.g., image data) and the second data (e.g., data associated with an area for recognizing an effective touch) in the first memory (e.g., the graphics RAM  625 ) and the second memory (e.g., the register  640 ), respectively. Afterwards, the processor  650  may switch into the inactive or sleep state. 
     According to an embodiment, when the processor  650  is in the inactive or sleep state, the touch controller  630  may detect a touch input and may compare the detection result of the touch input with the second data. In the case where the comparison result indicates that the location of the detected touch input coincides with the partial area, for example, the touch controller  630  may activate the processor  650  by providing an interrupt. 
     According to an embodiment, in the case where a touch input for selecting the GUI (e.g., an icon or the like) of the application program is received when the processor  650  is in the inactive or sleep state, the processor  650  may be activated. The activated processor  650  may drive (or execute) at least part of the application program. 
       FIG. 10  is a flowchart illustrating a touch recognition method according to another embodiment. 
     Referring to  FIG. 10 , the touch recognition method according to an embodiment may include operation  1001  to operation  1021 . Operation  1001  to operation  1021  may be performed by, for example, the electronic device illustrated in  FIGS. 1 to 6A . For example, operation  1001  to operation  1021  may be implemented as instructions (commands) stored in a computer-readable recording medium or a memory. Hereinafter, the reference numerals of  FIG. 6A  will be used to describe operation  1001  to operation  1021 , and a description that is the same or similar as described with reference to  FIG. 6A  may not be repeated here. 
     In operation  1001 , the electronic device  601  may enter the inactive state (e.g., sleep state). The display driver integrated circuit  620 , the touch controller  630 , and the processor  650  may enter the inactive state (or sleep state) and may perform only specified restricted functions. The inactive state (e.g., sleep state) may be referred to as a “low power mode” or “standby mode.” For example, the user may push a specified button (e.g., a power button) of the electronic device  601  once so as to switch from the active state (or wake-up state) to the inactive state (or sleep state). 
     In operation  1003 , the electronic device  601  may output one or more GUI objects (e.g., icons) in at least a partial area of the touchscreen display  610 . For example, in the inactive state (or sleep state), the display driver integrated circuit  620  of the electronic device  601  may output a digital clock, a date, and a battery state in the first area  611  and may output one or more GUI objects in the second area  612 . This is often called the AOD mode. After the processor  650  supplies image data indicating the digital clock, the date, and the battery state to the display driver integrated circuit  620 , the display driver integrated circuit  620  may operate independent of the processor  650 . 
     In operation  1005 , the processor  650  may temporarily operate in the active state (or wake-up state) and may write data associated with a specified area (e.g., the second area  612 ) for sensing an effective touch and data indicating types of the effective touches in the register  640 . 
     For example, the data associated with the specified area (e.g., the second area  612 ) may include width data “W” and height data “H” of the specified area (e.g., the second area  612 ), or coordinate data (Xoffset, Yoffset) associated with one point defining a circumference of the specified area (e.g., the second area  612 )(refer to  FIGS. 8A and 8B ). 
     For example, the types of the effective touches may include a double touch or a long press. According to an embodiment, the processor  650  may write data for enabling double touch (or long press) in storage spaces (e.g.,  743 - 1  or  743 - 2  of  FIG. 7B ) of the register  640 . 
     After supplying image data indicating the digital clock, the date, and the battery state to the display driver integrated circuit  620  in operation  1003  and writing data associated with the specified area (e.g., the second area  612 ) for sensing an effective touch in the register  640  in operation  1005 , in operation  1007 , the processor  650  may again enter the inactive state (or sleep state). 
     In operation  1009 , while in the inactive state, the touch controller  630  may determine whether an effective touch is sensed based on the data written in the register  640  in operation  1005 . For example, the touch controller  630  may determine whether an effective touch is sensed in the specified area (e.g., the second area  612 ) based on the data associated with the specified area (e.g., the second area  612 ). Also, for example, the touch controller  630  may determine whether the type of the detected touch corresponds to one of the effective touch types, based on data indicating the types of effective touches (e.g., a double touch, a long press, or the like). If it is determined that the effective touch is detected or sensed in the specified area (e.g., the second area  612 ), the touch controller  630  may perform operation  1011 ; otherwise, the touch controller  630  may again perform operation  1009 . 
     Since it is determined that the effective touch is sensed in the specified area (e.g., the second area  612 ), in operation  1011 , the touch controller  630  may write the data associated with the effective touch in the register  640 . For example, the data associated with the effective touch may correspond to location coordinate data of the effective touch or identification information of a division area corresponding to the effective touch. 
     In operation  1012 , a pressure sensor IC may activate a pressure sensor in response to the touch controller  630  writing the data associated with the effective touch in the register  640 . For example, the pressure sensor IC may receive a signal from the touch controller  630  and may be activated by using the received signal as a trigger. 
     According to one embodiment, operation  1012  may be omitted in an electronic device that is not equipped with the pressure sensor. Also, according to another embodiment, operation  1012  may be performed after operation  1015 . For example, the processor  650  may provide the signal to the pressure sensor IC after obtaining data (e.g., coordinate data) associated with the effective touch in operation  1015 . The pressure sensor IC may activate the pressure sensor in response to the signal from the processor  650 . 
     In operation  1013 , the touch controller  630  may provide an interrupt to the processor  650 . The processor  650  may switch into the active or wake-up state by the interrupt. 
     In operation  1015 , the processor  650  may read data about an effective touch written in operation  1011  from the register  640  in response to the interrupt from the touch controller  630 . 
     In operation  1017 , the processor  650  may select or determine the GUI object corresponding to data (e.g., location coordinate data of an effective touch or identification information of the division area corresponding to effective touch) associated with the effective touch (refer to  FIGS. 8A and 8B ). 
     In operation  1019 , the processor  650  may apply a specified graphic effect (e.g., color inversion of the identified GUI object or temporary enlargement/reduction of the identified GUI object) to the GUI object selected in operation  1017 . According to an embodiment, the graphic effect may be applied in response to a touch down/touch release of the effective touch. 
     In operation  1021 , the processor  650  may execute a function that is allocated to the selected GUI object. For example, the allocated function may be to execute the application corresponding to the GUI object. 
     According to various embodiments of the present disclosure, even though an electronic device operates in an inactive state where power consumption is low, the electronic device may display various information and GUI objects in the display and may recognize a touch input to one of the GUI objects. Accordingly, both an always-on display (AOD) and an always-on touch function (AOT) may be implemented. 
     As described above, an electronic device according to an embodiment may include a processor, a touch sensor, and a touch controller including a register. The processor may write, into the register, data associated with a partial area of the touch sensor specified to sense an effective touch. When the effective touch is sensed in the partial area of the touch sensor, the touch controller may write data associated with the effective touch into the register, and the processor may then read the data associated with the effective touch from the register if the data associated with the effective touch is written in the register. 
     According to another embodiment, the touch controller may provide an interrupt to the processor, and the processor may read the data associated with the effective touch in response to the interrupt. 
     According to another embodiment, the data associated with the partial area of the touch sensor may include width data and height data of the partial area or coordinate data associated with one point defining a circumference of the partial area. 
     According to another embodiment, the processor may write the data associated with the partial area of the touch sensor into the register periodically or aperiodically. 
     According to another embodiment, the processor may be configured to enter an inactive state (e.g., sleep state) after writing the data associated with the partial area of the touch sensor into the register. 
     According to another embodiment, the data associated with the effective touch may include location coordinate data of the effective touch. 
     According to another embodiment, the touch controller may activate the partial area of the touch sensor and may deactivate the remaining area of the touch sensor other than the partial area. 
     According to another embodiment, the touch controller may drive the touch sensor at a first frequency, and if a touch is sensed in the touch sensor, the touch controller may drive the touch sensor at a second frequency higher than the first frequency and may determine whether the effective touch is sensed. 
     According to another embodiment, the processor may further write data indicating one or more types of the effective touch into the register, and the touch controller may determine whether the effective touch is sensed, based on the data indicating the one or more types. 
     According to another embodiment, the one or more types of the effective touch may include a double touch including a first touch and a second touch or a long press. 
     According to another embodiment, the touch controller may drive the touch sensor at a first frequency, and the touch controller may drive the touch sensor at a second frequency higher than the first frequency if a first touch is sensed in the partial area of the touch sensor, and may determine the effective touch to be a double touch if a second touch is sensed during a specified time interval after the first touch is sensed. 
     According to another embodiment, the touch controller may determine the double touch as the effective touch if a distance between a location of the first touch and a location of the second touch is not greater than a specified distance. 
     According to another embodiment, the partial area of the touch sensor may include a plurality of division areas, and the touch controller may determine the double touch as the effective touch if a location of the first touch and a location of the second touch are within the same division area. 
     According to another embodiment, if the touch controller determines the double touch as the effective touch, the touch controller may write coordinate data of a location of the first touch as the data associated with the effective touch. 
     According to another embodiment, if the touch controller determines the double touch as the effective touch, the touch controller may write identification information of the same division area where the first and second touches are located as the data associated with the effective touch. 
     According to another embodiment, the touch controller may drive the touch sensor at a first frequency, and the touch controller may drive the touch sensor at a second frequency higher than the first frequency if the first touch is sensed in the touch sensor, and may determine the touch as a non-effective touch if the second touch is not sensed in the specified area during a specified time or if the second touch is not sensed in the remaining area of the touch sensor other than the specified area. 
     According to another embodiment, the electronic device may further include a display coupled to the processor. The display may be overlaid with the touch sensor or including the touch sensor. The processor may output at least one graphic user interface (GUI) object in a partial area of the display corresponding to the partial area of the touch sensor, may identify a GUI object at a location corresponding to the read data associated with the effective touch, and may execute a function allocated to the identified GUI object. 
     According to another embodiment, the partial area of the display may at least partially overlap with the partial area of the touch sensor. 
     According to another embodiment, the processor may apply a specified graphic effect to the identified GUI object before execution of the function allocated to the identified GUI object. 
     According to another embodiment, the effective touch may include at least one touch down and at least one touch release. The touch controller may provide an interrupt to the processor after writing data indicating the at least one touch down and the at least one touch release in the register. The processor may apply a specified graphic effect to the identified GUI object in response to the interrupt. 
     A touch recognition method according to an embodiment may include writing, into a register included in a touch controller, data associated with a partial area of a touch sensor, when the effective touch is sensed in the partial area of the touch sensor, writing, into the register by the touch controller, data associated with the effective touch, and when the data associated with the effective touch is written into the register, reading the data associated with the effective touch from the register. 
     According to another embodiment, the touch recognition method may further include outputting at least one graphic user interface (GUI) object in a partial area of a display, wherein the partial area of the display at least partially overlaps with the partial area of the touch sensor, determining a GUI object at a location corresponding to the read data associated with the effective touch, and executing a function allocated to the determined GUI object. 
     An electronic device according to an embodiment may include a housing that includes a first surface and a second surface opposite the first surface, a display that is exposed through the first surface and is interposed between the first surface and the second surface, a touch panel that is interposed between the display and the first surface or is coupled to the display, a display driver integrated circuit (DDI) that is electrically connected to the display and including a first memory, a touch controller integrated circuit (IC) that is electrically connected to the touch panel and includes a second memory, a processor that is electrically connected to the DDI and the touch controller IC, and a nonvolatile memory that is electrically connected to the processor. The nonvolatile memory stores instructions that, when executed, cause the processor to store, in the first memory, first data related to a graphic user interface (GUI) to be displayed in a portion of the display while the processor is deactivated or in a sleep state, to store second data associated with the partial area of the display in the second memory, and to enter the sleep state after storing the first data and the second data in the first memory and the second memory, respectively. 
     According to another embodiment, when the processor is in the sleep state, the touch controller IC may compare a location of a detected touch input with the second data. 
     According to another embodiment, the touch controller IC may be configured to activate the processor if the comparison result indicates the location of the detected touch input coincides with at least part of the portion of the display. 
     According to another embodiment, the GUI may include a GUI of an application program. The instructions may cause the processor to be activated and to drive at least part of the application program if the detected touch input selects the GUI of the application program. 
     According to another embodiment, the DDI may display the remaining area of the display other than the portion of the display displaying the GUI as a black background when the processor is in the sleep state. 
     The term “module” used in this disclosure may represent, for example, a unit including one or more combinations of hardware, software and firmware. The term “module” may be interchangeably used with the terms “unit,” “logic,” “logical block,” “component” and “circuit”. The “module” may be implemented mechanically or electronically. For example, the “module” may include at least one of an application-specific IC (ASIC) chip, a field-programmable gate array (FPGA), and a programmable-logic device for performing some operations, which are known or will be developed. 
     At least a part of an apparatus (e.g., modules or functions thereof) or a method (e.g., operations) according to various embodiments may be, for example, implemented by instructions stored in computer-readable storage media in the form of a program module. The instruction, when executed by a processor (e.g., the processor  120 ), may cause the one or more processors to perform a function corresponding to the instruction. The computer-readable storage media, for example, may be the memory  130 . 
     A computer-readable recording medium may include a hard disk, a floppy disk, a magnetic media (e.g., a magnetic tape), an optical media (e.g., a compact disc read only memory (CD-ROM) and a digital versatile disc (DVD), a magneto-optical media (e.g., a floptical disk)), and hardware devices (e.g., a read only memory (ROM), a random access memory (RAM), or a flash memory). Also, a program instruction may include not only a mechanical code such as things generated by a compiler but also a high-level language code executable on a computer using an interpreter. The above hardware unit may be configured to operate via one or more software modules for performing an operation according to various embodiments, and vice versa. 
     A module or a program module according to various embodiments may include at least one of the above elements, or a part of the above elements may be omitted, or additional other elements may be further included. Operations performed by a module, a program module, or other elements according to various embodiments may be executed sequentially, in parallel, repeatedly, or in a heuristic method. In addition, some operations may be executed in different sequences or may be omitted. Alternatively, other operations may be added. 
     According to various embodiments of the present disclosure, in an inactive state where power consumption is low, an electronic device may display various information and GUI objects in a display and may recognize a touch input to one of the GUI object. Accordingly, both an always-on display (AOD) and an always-on touch functions (AOT) may be implemented. Additionally, a variety of features directly or indirectly understood through this disclosure may be provided. 
     The above-described embodiments of the present disclosure can be implemented in hardware, firmware or via the execution of software or computer code that can be stored in a recording medium such as a CD ROM, a Digital Versatile Disc (DVD), a magnetic tape, a RAM, a floppy disk, a hard disk, or a magneto-optical disk or computer code downloaded over a network originally stored on a remote recording medium or a non-transitory machine readable medium and to be stored on a local recording medium, so that the methods described herein can be rendered via such software that is stored on the recording medium using a general purpose computer, or a special processor or in programmable or dedicated hardware, such as an ASIC or FPGA. As would be understood in the art, the computer, the processor, microprocessor controller or the programmable hardware include memory components, e.g., RAM, ROM, Flash, etc. that may store or receive software or computer code that when accessed and executed by the computer, processor or hardware implement the processing methods described herein. 
     While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.