KR20130121458A - Method of controlling display processor - Google Patents

Abstract

A method of controlling a display processor according to an embodiment of the present invention comprises a step of calculating a frame data processing time according to clock frequencies which are lower than the current clock frequency of a processor; and a step of processing frame data by driving the processor with the clock frequency when the calculated processing time is shorter than a time interval until the next screen is scanned after one screen is scanned by vertical synchronization (vsync). [Reference numerals] (AA) Start;(BB) No;(CC) Yes;(S100) Calculate frame data processing time;(S110) Frame data processing time < vsync section time?;(S120) Set CPU Clock frequency;(S130) Display frame data

Description

Display processor control method {METHOD OF CONTROLLING DISPLAY PROCESSOR}

The present invention relates to a display processor control method for operating a processor at low power.

The terminal can move And can be divided into a mobile / portable terminal and a stationary terminal depending on whether the mobile terminal is a mobile terminal or a mobile terminal. The mobile terminal can be divided into a handheld terminal and a vehicle mount terminal according to whether the user can directly carry the mobile terminal.

Such a terminal has various functions, for example, in the form of a multimedia device having multiple functions such as photographing and photographing of a moving picture, reproduction of a music or video file, reception of a game and broadcasting, etc. .

In order to support and enhance the functionality of such terminals, it may be considered to improve the structural and / or software parts of the terminal.

Processors in mobile terminals are evolving from traditional one-core processors to multi-core processors. In addition, the mobile terminal uses a limited power source, and the user often uses the mobile terminal by hand. Accordingly, there is a need for a processor that operates at a low power and generates less heat even when the number of cores of the processor of the mobile terminal is increased.

The present invention is proposed to meet the above-described needs, and an object of the present invention is to provide a display processor control method capable of reducing power consumption of a processor.

Another object of the present invention is to provide a display processor control method capable of reducing heat generation of a processor.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

According to an exemplary embodiment of the present invention, a display processor control method includes calculating frame data processing time according to at least one second clock frequency lower than a current first clock frequency of a processor, and a calculated processing time. And processing the frame data by driving the processor at a second clock frequency when the screen is shorter than the interval time from scanning one screen by the vertical synchronization (vsync) signal to scanning the next screen.

In this case, the processing of the frame data may be a step of processing the frame data by selecting the lowest clock frequency among the plurality of second clock frequencies when there are a plurality of second clock frequencies.

The method may further include calculating a frame data processing time according to the first clock frequency, and calculating the frame data processing time according to the second clock frequency, wherein the frame data processing time according to the first clock frequency is greater than the interval time. It can be done in the short case.

If the frame data processing time according to the first clock frequency is longer than the interval time, the method may further include driving the processor at a third clock frequency higher than the first clock frequency to process the frame data.

In this case, the method may further include displaying frame data processed by the driving of the processor.

Meanwhile, the method may further include recording frame data processed by the driving of the processor in a memory.

The method may further include reading and displaying the frame data recorded in the memory at the end of the interval time.

According to an embodiment of the present invention, a display processor control method includes calculating frame data output processing time when selecting and driving N processor cores of a multi-core processor including M cores, and a calculated process. If the time is shorter than the inactive interval time from scanning one screen from the vertical synchronization signal to scanning the next screen, driving the predetermined number of processor cores to process the frame data, wherein M and N are natural numbers, ( M> N).

The calculating of the frame data processing time may include calculating the frame data processing time according to the driving of each of the one or more processor cores less than the number of processor cores currently running.

The processing of the frame data may be a step of processing the frame data by selecting the smallest number of processor cores whose calculated frame data processing time is shorter than the interval time.

The effect of the display processor control method according to the present invention will be described.

According to at least one of the embodiments of the present invention, there is an advantage of reducing the heat generation of the processor.

In addition, according to at least one of the embodiments of the present invention, there is an advantage of reducing the power consumed by the processor.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

1 is a block diagram of a mobile terminal according to an embodiment of the present invention.
2 is a front perspective view of a mobile terminal according to an embodiment of the present invention.
3 is a rear perspective view of a mobile terminal according to an embodiment of the present invention.
4 is a perspective view of a rear cover removed from the rear of the mobile terminal according to an embodiment of the present invention.
5 is an exemplary view illustrating a time flow of a display processor control method according to an exemplary embodiment of the present invention.
6 is a flowchart illustrating a clock frequency changing process of the display processor control method according to an exemplary embodiment of the present invention, and FIG. 7 is a flowchart illustrating a clock frequency changing process of the display processor control method according to an exemplary embodiment of the present invention.
8 is a flowchart illustrating a display processor control method of changing the number of cores according to an exemplary embodiment of the present invention, and FIG. 9 is a flowchart illustrating a clock frequency changing process of the display processor control method according to an exemplary embodiment of the present invention.
10 is a flowchart illustrating a method of changing a clock frequency and the number of cores in a display processor control method according to an exemplary embodiment of the present invention.

Hereinafter, a mobile terminal related to the present invention will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

The mobile terminal described in this specification may include a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), and navigation. However, it will be readily apparent to those skilled in the art that the configuration according to the embodiments described herein may also be applied to fixed terminals such as digital TVs, desktop computers, etc., except when applicable only to mobile terminals.

1 is a block diagram of a mobile terminal according to an embodiment of the present invention.

The mobile terminal 100 includes a wireless communication unit 110, an audio / video input unit 120, a user input unit 130, a sensing unit 140, an output unit 150, a memory 160, A controller 170, a controller 180, a power supply 190, and the like. The components shown in FIG. 1 are not essential, and a mobile terminal having more or fewer components may be implemented.

Hereinafter, the components will be described in order.

The wireless communication unit 110 may include one or more modules for enabling wireless communication between the mobile terminal 100 and the wireless communication system or between the mobile terminal 100 and the network in which the mobile terminal 100 is located. For example, the wireless communication unit 110 may include a broadcast receiving module 111, a mobile communication module 112, a wireless Internet module 113, a short range communication module 114, and a location information module 115 .

The broadcast receiving module 111 receives a broadcast signal and / or broadcast related information from an external broadcast management server through a broadcast channel. The broadcast channel may include a satellite channel and a terrestrial channel. Two or more broadcast receiving modules may be provided to the mobile terminal 100 for simultaneous broadcast reception or broadcast channel switching for at least two broadcast channels.

The broadcast management server may refer to a server for generating and transmitting broadcast signals and / or broadcast related information, or a server for receiving broadcast signals and / or broadcast related information generated by the broadcast management server and transmitting the generated broadcast signals and / or broadcast related information. The broadcast signal may include a TV broadcast signal, a radio broadcast signal, a data broadcast signal, and a broadcast signal in which a data broadcast signal is combined with a TV broadcast signal or a radio broadcast signal.

The broadcast-related information means information related to a broadcast channel, a broadcast program, or a broadcast service provider. The broadcast related information may also be provided through a mobile communication network. In this case, it may be received by the mobile communication module 112.

The broadcast-related information may exist in various forms. For example, it may exist in the form of Electronic Program Guide (EPG) of Digital Multimedia Broadcasting (DMB) or Electronic Service Guide (ESG) of Digital Video Broadcast-Handheld (DVB-H).

For example, the broadcast receiving module 111 may be a Digital Multimedia Broadcasting-Terrestrial (DMB-T), a Digital Multimedia Broadcasting-Satellite (DMB-S), a Media Forward Link Only (Mobile Broadcasting Business Management System), ISDB-T (Integrated Services Digital Broadcasting (ISDB-T)), Digital Multimedia Broadcasting (MBMS) Digital Broadcast-Terrestrial) or the like. Of course, the broadcast receiving module 111 may be adapted to other broadcasting systems as well as the digital broadcasting system described above.

The broadcast signal and / or broadcast related information received through the broadcast receiving module 111 may be stored in the memory 160.

The mobile communication module 112 may be coupled to a base station, an external terminal, or a server on a mobile communication network, such as, but not limited to, Gobal System for Mobile communications (GSM), Code Division Multiple Access (CDMA), Wideband CDMA Transmits and receives wireless signals with one. The wireless signal may include various types of data depending on a voice call signal, a video call signal or a text / multimedia message transmission / reception.

The wireless Internet module 113 is a module for wireless Internet access, and may be built in or externally attached to the mobile terminal 100. Wireless Internet technologies include WLAN (Wi-Fi), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access), GSM, CDMA, WCDMA, LTE Evolution (but not limited to) may be used.

The wireless Internet module 113, which performs wireless Internet access through the mobile communication network, is connected to the mobile communication module 110 through the mobile communication network, for example, from the viewpoint that the wireless Internet access by Wibro, HSDPA, GSM, CDMA, WCDMA, LTE, (112). &Lt; / RTI &gt;

The short-range communication module 114 refers to a module for short-range communication. Bluetooth, Radio Frequency Identification (RFID), infrared data association (IrDA), Ultra Wideband (UWB), ZigBee, and the like can be used as a short range communication technology.

The position information module 115 is a module for obtaining the position of the mobile terminal, and a representative example thereof is a Global Position System (GPS) module. According to the current technology, the GPS module 115 calculates distance information and accurate time information from three or more satellites, and then applies trigonometry to the calculated information to obtain a three-dimensional string of latitude, longitude, The location information can be accurately calculated. At present, a method of calculating position and time information using three satellites and correcting an error of the calculated position and time information using another satellite is widely used. In addition, the GPS module 115 can calculate speed information by continuously calculating the current position in real time.

Referring to FIG. 1, an A / V (Audio / Video) input unit 120 is for inputting an audio signal or a video signal, and may include a camera 121 and a microphone 122. The camera 121 processes image frames such as still images or moving images obtained by the image sensor in the video call mode or the photographing mode. The processed image frame can be displayed on the display unit 151. [

The image frame processed by the camera 121 may be stored in the memory 160 or transmitted to the outside through the wireless communication unit 110. [ Two or more cameras 121 may be provided depending on the use environment.

The microphone 122 receives an external sound signal through a microphone in a communication mode, a recording mode, a voice recognition mode, or the like, and processes it as electrical voice data. The processed voice data can be converted into a form that can be transmitted to the mobile communication base station through the mobile communication module 112 when the voice data is in the call mode, and output. Various noise reduction algorithms may be implemented in the microphone 122 to remove noise generated in receiving an external sound signal.

The user input unit 130 generates input data for a user to control the operation of the terminal. The user input unit 130 may include a button 136 located on the front, rear, or side of the mobile terminal 100, and a touch sensor (static / static) 137. Although not shown, ), A dome switch, a jog wheel, a jog switch, and the like.

The sensing unit 140 senses the current state of the mobile terminal 100 such as the open / close state of the mobile terminal 100, the position of the mobile terminal 100, the presence or absence of user contact, the orientation of the mobile terminal, And generates a sensing signal for controlling the operation of the mobile terminal 100. For example, when the mobile terminal 100 is in the form of a slide phone, it may sense whether the slide phone is opened or closed. In addition, whether the power supply unit 190 is supplied with power, whether the interface unit 170 is coupled to the external device may be sensed. Meanwhile, the sensing unit 140 may include a proximity sensor 141. (The proximity sensor will be described later).

The output unit 150 is for generating output related to the visual, auditory or tactile sense and includes a display unit 151, an audio output module 152, an alarm unit 153, and a haptic module 154 .

The display unit 151 displays (outputs) information processed by the mobile terminal 100. For example, when the mobile terminal is in the call mode, a UI (User Interface) or a GUI (Graphic User Interface) associated with a call is displayed. When the mobile terminal 100 is in the video communication mode or the photographing mode, the photographed and / or received video or UI and GUI are displayed.

The display unit 151 may be a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), a flexible display display, and a 3D display.

Some of these displays may be transparent or light transmissive so that they can be seen through. This can be referred to as a transparent display, and a typical example of the transparent display is TOLED (Transparent OLED) and the like. The rear structure of the display unit 151 may also be of a light transmission type. With this structure, the user can see an object located behind the terminal body through the area occupied by the display unit 151 of the terminal body.

There may be two or more display units 151 according to the embodiment of the mobile terminal 100. For example, in the mobile terminal 100, a plurality of display portions 151 may be spaced apart from one another or may be arranged integrally with one another, or may be disposed on different surfaces.

In the case where the display unit 151 and the touch sensor 137 have a mutual layer structure or are integrally formed (hereinafter referred to as a 'touch screen'), the display unit 151 may be used as an input device . The touch sensor may be stacked on the display unit 151 to form a layer structure when the touch sensor has a form of a touch film, a touch sheet, a touch pad, or the like. &Lt; / RTI &gt;

The touch sensor may be configured to convert a change in a pressure applied to a specific portion of the display unit 151 or a capacitance generated in a specific portion of the display unit 151 into an electrical input signal. The touch sensor can be configured to detect not only the position and area to be touched but also the pressure at the time of touch.

If there is a touch input to the touch sensor, the corresponding signal (s) is sent to the touch controller (not shown). The touch controller processes the signal (s) and transmits the corresponding data to the controller 180. As a result, the controller 180 can know which area of the display unit 151 is touched.

The proximity sensor 141 may be disposed in an inner region of the mobile terminal or in the vicinity of the touch screen, which is enclosed by the touch screen. The proximity sensor refers to a sensor that detects the presence or absence of an object approaching a predetermined detection surface or a nearby object without mechanical contact using the force of an electromagnetic field or infrared rays. The proximity sensor has a longer life span than the contact sensor and its utilization is also high.

Examples of the proximity sensor include a transmission photoelectric sensor, a direct reflection photoelectric sensor, a mirror reflection photoelectric sensor, a high frequency oscillation proximity sensor, a capacitive proximity sensor, a magnetic proximity sensor, and an infrared proximity sensor. And to detect the proximity of the pointer by the change of the electric field along the proximity of the pointer when the touch screen is electrostatic. In this case, the touch screen (touch sensor) may be classified as a proximity sensor.

Hereinafter, for convenience of explanation, the act of recognizing that the pointer is positioned on the touch screen while the pointer is not in contact with the touch screen is referred to as "proximity touch" The act of actually contacting the pointer on the touch screen may be referred to as "contact touch. &Quot; The location where the pointer is proximately touched on the touch screen may refer to a position where the pointer corresponds vertically to the touch screen when the pointer is touched.

The proximity sensor detects a proximity touch and a proximity touch pattern (e.g., a proximity touch distance, a proximity touch direction, a proximity touch speed, a proximity touch time, a proximity touch position, a proximity touch movement state, and the like). Information corresponding to the detected proximity touch operation and the proximity touch pattern may be output on the touch screen.

The sound output module 152 may output audio data received from the wireless communication unit 110 or stored in the memory 160 in a call signal reception, a call mode or a recording mode, a voice recognition mode, a broadcast reception mode, and the like. The sound output module 152 also outputs sound signals related to functions (e.g., call signal reception sound, message reception sound, etc.) performed in the mobile terminal 100. [ The audio output module 152 may include a receiver, a speaker, a buzzer, and the like.

The alarm unit 153 outputs a signal for notifying the occurrence of an event of the mobile terminal 100. Examples of events that occur in the mobile terminal include call signal reception, message reception, key signal input, touch input, and the like. The alarm unit 153 may output a signal for notifying the occurrence of an event in a form other than the video signal or the audio signal, for example, vibration. In this case, the display unit 151 and the sound / voice output module 152 may be a kind of the alarm unit 153. The display unit 151 and the sound / . &Lt; / RTI &gt;

The haptic module 154 generates various tactile effects that the user can feel. Vibration is a representative example of the haptic effect generated by the haptic module 154. The intensity and pattern of vibration generated by the haptic module 154 can be controlled. For example, different vibrations may be synthesized and output or sequentially output.

In addition to the vibration, the haptic module 154 may include a pin arrangement vertically moving with respect to the contact skin surface, a spraying force or suction force of the air through the injection port or the suction port, a touch on the skin surface, contact with an electrode, And various tactile effects such as an effect of reproducing a cold sensation using an endothermic or exothermic element can be generated.

The haptic module 154 can be implemented not only to transmit the tactile effect through the direct contact but also to allow the user to feel the tactile effect through the muscular sensation of the finger or arm. At least two haptic modules 154 may be provided according to the configuration of the mobile terminal 100.

The memory unit 160 may store a program for processing and controlling the control unit 180 and temporarily store the input / output data (e.g., telephone directory, message, audio, For example. The memory unit 160 may store the frequency of use of each of the data (for example, each telephone number, each message, and frequency of use for each multimedia).

In addition, the memory unit 160 may store data on vibration and sound of various patterns output when the touch is input on the touch screen.

The memory 160 may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or XD memory), a RAM (Random Access Memory), SRAM (Static Random Access Memory), ROM (Read Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), PROM A disk, and / or an optical disk. The mobile terminal 100 may operate in association with a web storage that performs a storage function of the memory 160 on the Internet.

The interface unit 170 serves as a path for communication with all external devices connected to the mobile terminal 100. The interface unit 170 receives data from an external device or supplies power to each component in the mobile terminal 100 or transmits data to the external device. For example, a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, a port for connecting a device having an identification module, an audio I / O port, A video input / output (I / O) port, an earphone port, and the like may be included in the interface unit 170.

The identification module is a chip for storing various information for authenticating the use right of the mobile terminal 100 and includes a user identification module (UIM), a subscriber identity module (SIM), a general user authentication module A Universal Subscriber Identity Module (USIM), and the like. Devices with identification modules (hereinafter referred to as "identification devices") can be manufactured in a smart card format. Accordingly, the identification device can be connected to the terminal 100 through the port.

When the mobile terminal 100 is connected to an external cradle, the interface unit may be a path through which power from the cradle is supplied to the mobile terminal 100, or various command signals input by the user to the cradle may be transmitted It can be a passage to be transmitted to the terminal. The various command signals or the power source input from the cradle may be operated as a signal for recognizing that the mobile terminal is correctly mounted on the cradle.

The controller 180 typically controls the overall operation of the mobile terminal. For example, voice communication, data communication, video communication, and the like. The control unit 180 may include a multimedia module 181 for multimedia playback. The multimedia module 181 may be implemented in the control unit 180 or may be implemented separately from the control unit 180. [

The controller 180 may perform a pattern recognition process for recognizing handwriting input or drawing input performed on the touch screen as characters and images, respectively.

The power supply unit 190 receives an external power source and an internal power source under the control of the controller 180 to supply power for operation of each component. The power supply unit 190 may include, for example, a battery, a connection port, a power supply control unit, and a charge monitoring unit.

The battery may be an internal battery configured to be chargeable, and may be detachably coupled to the terminal body for charging or the like. The connection port may be configured as an example of an interface 170 through which an external charger for supplying power for charging the battery is electrically connected.

The various embodiments described herein may be embodied in a recording medium readable by a computer or similar device using, for example, software, hardware, or a combination thereof.

According to a hardware implementation, the embodiments described herein include application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), and the like. It may be implemented using at least one of processors, controllers, micro-controllers, microprocessors, and electrical units for performing other functions. The described embodiments may be implemented by the controller 180 itself.

According to the software implementation, embodiments such as the procedures and functions described herein may be implemented as separate software modules. Each of the software modules may perform one or more of the functions and operations described herein. Software code can be implemented in a software application written in a suitable programming language. The software code is stored in the memory 160 and can be executed by the control unit 180. [

FIG. 2 is a perspective view of a mobile terminal or a portable terminal according to the present invention, as viewed from the front.

The disclosed mobile terminal 100 includes a bar-shaped terminal body. However, the present invention is not limited thereto, and can be applied to various structures such as a slide type, a folder type, a swing type, and a swivel type in which two or more bodies are relatively movably coupled.

The body of the mobile terminal 100 includes a casing 101, 102, In this embodiment, the case may be divided into a front case 101 and a rear case 102. [ A variety of electronic components are embedded in the space formed between the front case 101 and the rear case 102.

A part such as a USIM card and a memory card, which is required to be detached, such as an auxiliary storage medium 165, may include an opening in the case so that the part can be inserted into the case from the outside. Slots may be formed on the side of the case so that the auxiliary storage medium 165 may be inserted from the side of the mobile terminal 100 and card slots 166 and 167 may be formed on the surface of the rear case 102 It is possible.

The cases 101, 102, and 103 may be formed by injection molding synthetic resin or may be formed of a metal material such as stainless steel (STS) or titanium (Ti).

The display unit 151, the sound output unit 152, the camera 121, the user input units 130/131 and 132, the microphone 122, and the interface 170 may be disposed in the terminal cases 101 and 102.

The display unit 151 occupies most of the main surface of the front case 101. A sound output unit 152 and a camera 121 are disposed in an area adjacent to one end of both ends of the display unit 151 and a user input unit 131 and a microphone 122 are disposed in an area adjacent to the other end. The user input unit 132 and the interface 170 may be disposed on the side surfaces of the front case 101 and the rear case 102. [

The user input unit 130 is operated to receive a command for controlling the operation of the mobile terminal 100 and may include a plurality of operation units 131, 132, and 133. The operation units 131, 132, and 133 may be collectively referred to as a manipulating portion.

The contents inputted by the first or second operation unit 131 or 132 may be variously set. For example, the first operation unit 131 receives a command such as start, end, scroll, and the like, and the second operation unit 132 inputs a command such as adjustment of the sound output from the sound output unit 152 And the third operation unit 133 can receive commands such as activation / deactivation of the touch recognition mode of the display unit 151 and the like.

The operation units 131, 132, and 133 may have a button method for recognizing when a user applies pressure. In addition to the display unit 151, the operation units 131, 132, and 133 may include a touch sensor. The user's command may be input only by touching.

3 is a rear perspective view of the mobile terminal shown in FIG.

Referring to FIG. 3, a camera 121 'may be further mounted on the rear surface of the terminal body, that is, the rear case 102. The camera 121 'may have a photographing direction substantially opposite to the camera 121 (see FIG. 2), and may be a camera having the same or different pixels as the camera 121.

For example, the camera 121 may have a low pixel so that the face of the user can be photographed and transmitted to the other party in case of a video call or the like, and the camera 121 ' It is preferable to have a large number of pixels. The cameras 121 and 121 'may be installed in the terminal body such that they can be rotated or pop-up.

A flash 123 and a mirror 124 may be additionally disposed adjacent to the camera 121 '. The flash 123 illuminates the subject when the subject is photographed by the camera 121 '. The mirror 124 allows the user to illuminate the user's own face or the like when the user intends to shoot himself / herself (self-photographing) using the camera 121 '.

An acoustic output 152 'may be additionally disposed on the rear surface of the terminal body. The sound output 152 'on the rear side of the body may implement the stereo function together with the sound output 152 (see FIG. 2) of the front side of the body, and may be used for the implementation of the speakerphone mode during a call.

In addition to the antenna for talking and the like, a broadcast signal reception antenna 116 may be additionally disposed on the side of the terminal body. The antenna 116, which forms part of the broadcast receiving module 111 (see FIG. 1), can be installed to be able to be drawn out from the terminal body.

Figure 4 is a rear perspective view showing the surface of the rear case by removing the rear cover of the mobile terminal according to an embodiment of the present invention. Referring to FIG. 4, the front case 101, the rear case 102, the rear cover (or the battery cover) 103, the camera 121 ′, the interface 170, the microphone 122, the sound output unit 152. '), Battery 191, battery mount 104, USIM card mount 166, memory card mount 167 are shown.

The rear case 102 may have a space on which external components such as the battery loading unit 104, the USIM card loading unit 166, and the memory card loading unit 167 can be mounted. In general, an external component mounted on the surface of the rear case 102 is used to extend the functions of the mobile terminal 100 in order to satisfy diversified functions of the mobile terminal 100 to be.

As the performance of the mobile terminal 100 is diversified, the battery 191 may be configured as a replaceable type as illustrated in FIG. 4 to compensate for the large power consumption. In the case of the interchangeable type, a battery mounting portion 104 is formed on the surface of the rear case 102 so that a user can attach and detach the battery. The battery mounting portion 104 is provided with a connection terminal to be electrically connected to a component mounted inside the case.

4, the USIM card mounting portion 166 and the memory card mounting portion 167 may be formed on the side of the battery mounting portion 104 or on the bottom surface of the battery mounting portion 104, May be formed to be exposed to the outside. In this case, the size of the battery mounting portion 104 can be larger, and the size of the battery 191 can be increased.

4 shows a configuration in which the USIM card mounting portion 166 and the memory card mounting portion 167 are mounted on the rear surface of the rear case 102. In addition, Do.

The rear cover 103 covers the surface of the rear case, and fixes the battery 191, USIM card, memory card, etc. mounted on the surface of the rear case 102 so as not to be detached, and from external impact or foreign matter. Protect the exterior parts. A waterproof structure (not shown) for sealing the rear case 102 and the rear cover 103 when the rear case 102 and the rear cover 103 are coupled to each other to prevent water from being injected into the external components.

Hereinafter, embodiments related to an image processing method that can be implemented in the mobile terminal configured as described above will be described with reference to the accompanying drawings.

5 is an exemplary view illustrating a time flow of a display processor control method according to an exemplary embodiment of the present invention. As shown, the first, second and third sections are sections of scanning one screen by a vertical synchronization (vsync) signal and then scanning the next screen, and the vertical synchronization signal is a display refresh. It may change according to the display refresh rate. In addition, the refresh rate in FIG. 5 is demonstrated by 60 Hz (hertz / Hz), for example.

When the frame data processing of the processor 180 in the first section is finished, the frame data processing time according to the second clock frequency lower than the current first clock frequency of the processor 180 may be calculated. . In one example, for t1 hours, the processor 180 may operate at 800 megahertz, 500 megahertz or 400 megahertz lower than 1 gigahertz if the current clock frequency of the processor 180 is 1 gigahertz (GHz). The frame data processing time of the processor 180 is calculated. This may be expressed by Equation 1 below.

Where estimatedDispPrepareTime is the frame data processing time, dispPrepareTime is the frame data processing time according to the current clock frequency of the processor 180, currCPUFreq is the current clock frequency of the processor 180, and lowCPUFreq is the clock of the processor 180 lower than the current clock frequency. Frequency and F represent constant coefficients.

Thereafter, the processor 180 compares the frame data processing time when operating at the calculated clock frequencies with the second interval time by the vertical synchronization signal, and when the frame data processing time is shorter than the interval time, the plurality of clocks. Select the lowest clock frequency of the frequencies.

For example, as calculated according to Equation 1, the frame data processing time when the processor 180 operates at 800 megahertz is 8 ms, and the frame data processing time when operating at 500 megahertz is 13 ms, and 400 megabytes. If the frame data processing time when operating in Hertz is 17ms, the processor 180 selects 500 megahertz from 800 MHz and 500 megahertz of a clock frequency having a frame data processing time smaller than the second interval time of 16.667 ms. To process the frame data.

In addition, the processor 180 may display the processed frame data when the interval time ends according to a subsequent vertical synchronization signal. In addition, the processor 180 may record the processed frame data in the memory when the interval time is not finished. Thereafter, when the vertical synchronization signal is input, the processor 180 may read and display frame data stored in the memory. Next, the display processor control method by changing the clock frequency will be described in detail with reference to FIGS. 6 and 7.

6 is a flowchart illustrating a clock frequency changing process of the display processor control method according to an exemplary embodiment of the present invention, and FIG. 7 is a flowchart illustrating a clock frequency changing process of the display processor control method according to an exemplary embodiment of the present invention.

As shown in FIG. 6, after the most recent vertical synchronizing signal is input and the frame data processing is completed, the processor 180 calculates the frame data processing time when processing the next frame data according to the clock frequency to be changed. (S100). The processor 180 may calculate the frame data processing time by using Equation 1 above, or may calculate it by another algorithm.

In operation S110, the processor 180 compares the frame data processing time with the section time based on the vertical synchronization signal. The vertical synchronization signal is input according to the refresh rate, and the refresh rate may be preset or may be changed.

In this case, when the refresh rate is changeable, the time for inputting the vertical synchronization signal may be estimated using the time interval value of the interval time according to the vertical synchronization signal.

Here, estimatedVSyncTime is the time when the vertical synchronization signal is input, currTime is the current time, and vSyncPeriod is the time interval value of the interval time.

For example, assuming that the vertical synchronization signal is input periodically during the initial operation of the processor, and estimates the time when the next vertical synchronization signal is input using Equation 2, the current time is 900000 ms, and the interval time When the time interval value is 16666 ms, the time when the next vertical sync signal is input is 916630 ms.

Next, when the frame data processing time according to the clock frequency to be changed is shorter than the interval time, the processor 180 sets the clock frequency of the processor 180 to the clock frequency to be changed (S120).

When the vertical synchronization signal is input, the processor 180 displays the processed frame data (S130) and processes the next frame data at the changed clock frequency.

In addition, in the comparison step S110, when the frame data processing time according to the clock frequency to be changed is greater than the interval time, the processor 180 displays the processed frame data without setting the clock frequency (S130). Hereinafter, a detailed description will be given with reference to FIG. 5.

As shown in FIG. 7, first, the processor 180 calculates a frame data processing time when processing frame data according to a current clock frequency (S200). That is, the processor 180 may calculate the time required when processing the frame data by the processor 180 according to the current clock frequency. The frame data processing time may be a time taken for displaying the last frame data by the vertical synchronization signal and processing the next frame data.

Then, it is compared whether the frame data processing time is shorter than the section time (S210). In this case, when the processing time of the last frame data is greater than the interval time, the processor 180 may set the clock frequency of the processor 180 by increasing the clock frequency.

On the other hand, when the frame data processing time is shorter than the interval time, the clock frequency lower than the current clock frequency is checked (S220). In one example, if the clock frequency of the current processor 180 is one gigahertz, the processor 180 identifies 800 megahertz, 500 megahertz, and 400 megahertz frequencies that are lower than one gigahertz.

The processor 180 calculates a frame data processing time according to the identified clock frequency (S230), and compares the calculated frame data processing time with the interval time (S240). Description of this is the same as described with reference to FIG. 5.

Next, when the calculated frame data processing time is shorter than the interval time, the processor 180 selects the lowest clock frequency that satisfies this and sets the clock frequency of the processor 180 (S250). Then, the processor 180 operates at the set clock frequency to process the next frame data. In addition, the processor 180 may display the frame data when the vertical synchronization signal is input by storing the frame data in the display (S260) or a memory.

Therefore, the display processor control method according to an embodiment of the present invention has the effect of reducing the power consumption by setting the clock frequency of the processor 180. That is, the display processor control method selects the lowest clock frequency among the clock frequencies capable of completing the frame data processing of the processor 180 within the interval time according to the refresh rate and sets the clock frequency of the processor 180 to the processor 180. ), It is possible to reduce heat generation and power consumption. Next, a display processor control method when the processor 180 is the multi-core processor 180 will be described with reference to FIGS. 6 and 7.

8 is a flowchart illustrating a display processor control method of changing the number of cores according to an exemplary embodiment of the present invention, and FIG. 9 is a flowchart illustrating a clock frequency changing process of the display processor control method according to an exemplary embodiment of the present invention. Since the display processor 180 may be a multi-core processor, the display processor 180 will be described below as a multi-core processor 180.

As shown in FIG. 8, after the most recent vertical synchronization signal is input and the frame data processing is completed, the multi-core processor 180 selects and drives a predetermined number of processor cores to process the next frame data. The frame data processing time is calculated (S300).

Here, estimatedDispPrepareTime is the frame data processing time, dispPrepareTime is the frame data processing time of the multi-core processor 180 according to the number of processor cores currently running in the multi-core processor 180, and currNumOfCPUCore is the processor in which the processor 180 is currently running. The number of cores, lowNumOfCPUCor is less than the number of processor cores currently running, and N is a constant coefficient.

The multi-core processor 180 may calculate the frame data processing time by using Equation 3 above, or may calculate it by another algorithm.

Then, the multi-core processor 180 compares the calculated frame data processing time with the section time by the vertical synchronization signal (S310). The vertical synchronization signal is input according to the refresh rate, and the refresh rate may be preset or may be changed. The interval time estimation when the refresh rate is changeable will be described later.

Next, the multi-core processor 180 selects and drives a predetermined number of processor cores, and when the frame data processing time when processing the next frame data is shorter than the interval time, the clock frequency of the processor 180 at the clock frequency to be changed. Set (S320).

When the vertical synchronization signal is input, the multi-core processor 180 displays the processed frame data (S330), selects and drives a predetermined number of processor cores, and processes the next frame data.

In addition, in the comparison step S310, if the frame data processing time according to the driving of the selected predetermined number of processor cores is greater than the interval time, the processor 180 does not change the number of processor cores or more cores than the current number of processor cores. The number is selected and driven, and the processed frame data is displayed (S330). Hereinafter, a detailed description will be given with reference to FIG. 7.

As shown in FIG. 9, first, the multiprocessor 180 calculates a frame data processing time of the multicore processor 180 according to the number of processor cores that are currently driven (S400). That is, the multi-core processor 180 may calculate the time required when processing the frame data by the multi-core processor 180 according to the number of processor cores currently running. The frame data processing time may be a time taken for displaying the last frame data by the vertical synchronization signal and processing the next frame data.

Then, it is compared whether the frame data processing time is shorter than the section time (S410). In this case, when the processing time of the last frame data is greater than the interval time, the processor 180 may select and drive more cores than the number of current processor cores.

On the other hand, if the frame data processing time is shorter than the interval time, the multi-core processor 180 checks the number of processor cores less than the number of processor cores currently driven (S420). For example, when the number of cores currently driven by the multi-core processor 180 is four, the multi-core processor 180 checks the number of three, two, or one cores less than four.

The multi-core processor 180 calculates the frame data processing time when the multi-core processor 180 is driven according to the identified number of cores (S430), and calculates the calculated frame data processing time and the interval time. Compare (S440).

Next, when the calculated frame data processing time is shorter than the interval time, the multi-core processor 180 selects the smallest number of cores satisfying the driving time and drives the multi-core processor 180 (S450).

For example, in the case of the quad core processor 180, if the frame data processing time is 6ms when driving four cores, the frame data processing time when driving three cores is 8ms and 2 cores according to Equation (3). The frame data processing time when driving a dog may be 13 ms, and the frame data processing time when driving one core may be 17 ms. At this time, the processor 180 is driven by selecting two cores, which is the number of cores having three or less of cores having a frame data processing time smaller than the second interval time of 16.667 ms, to process the frame data. do. That is, the multi-core processor 180 drives only two cores and does not drive the other two cores.

Then, the multi-core processor 180 drives the number of selected cores to process the next frame data. In addition, the processor 180 may display the frame data when the vertical synchronization signal is input by displaying the frame data in S460 or memory.

Therefore, the display processor control method according to an embodiment of the present invention has the effect of reducing the power consumption by selecting and driving the number of cores of the multi-core processor 180. That is, the display processor control method drives the multi-core processor 180 by selecting the smallest number of cores among the number of cores that can complete the frame data processing of the multi-core processor 180 within the interval time according to the refresh rate. There is an effect that can reduce the heat generation and power consumption of the multi-core processor 180. Next, a method of changing the clock frequency and the number of cores of the multi-core processor 180 of the display processor control method according to an exemplary embodiment of the present invention will be described with reference to FIG. 8.

10 is a flowchart illustrating a method of changing a clock frequency and the number of cores in a display processor control method according to an exemplary embodiment of the present invention. As shown, the multi-core processor 180 calculates the frame data processing time according to the number of cores currently driven and the clock frequency (S500).

Next, the calculated frame data processing time is compared with the interval time according to the vertical synchronization signal (S510). In this case, when the calculated frame data processing time and the short time according to the vertical synchronization signal are shorter, the multi-core processor 180 checks the number of processor cores smaller than the number of cores currently driven (S520). Apart from this, when the calculated frame data processing time and the short time according to the vertical synchronization signal, the multi-core processor 180 checks the clock frequency lower than the current clock frequency (S530).

Thereafter, the multi-core processor 180 calculates the frame data processing time when the multi-core processor 180 is driven according to the identified number of cores (S522), and calculates the calculated frame data processing time and the interval time. Compare (S524). In addition, the multi-core processor 180 calculates a frame data processing time according to the identified clock frequencies (S532), and compares the calculated frame data processing time with the section time (S534).

And, if the calculated frame data processing time is shorter than the interval time, the multi-core processor according to the power consumption value when driving the multi-core processor 180 and the identified clock frequency according to the number of each core identified ( In operation S540, the power consumption values at the time of driving 180 are compared.

Where PRclock is the power saving factor when changing the clock frequency, PRcore is the power saving factor when the number of cores is changed, P is a constant factor, lowerCPUFreq is the confirmed clock frequency, currCPUFreq is the current clock frequency, and lowerNumOfCPUCore is the identified core The number of and currNumOfCPUCore represents the number of cores currently running.

At this time, the power consumption value when the multi-core processor 180 is driven according to the identified number of cores is less than the power consumption value when the multi-core processor 180 is driven according to the identified clock frequency. If the number of cores of the multi-core processor 180 is selected to drive the multi-core processor 180 (S542), the power consumption value when driving the multi-core processor 180 according to the number of the identified cores If the power consumption is greater than the power consumption value when the multi-core processor 180 is driven according to each of the checked clock frequencies, the clock frequency of the multi-core processor 180 is set at the checked clock frequency (S544).

According to Equation 4, a lower case may be selected by calculating PRclock and PRcore and then comparing them. For example, if two cores are driven and one gigahertz is operating, if only one core is driven or if the clock frequency is 500 megahertz, then the calculated frame data processing time is shorter than the edge time, If the P value is defined as 0.75, according to equation (4), PRclock = 700/1000 * P = 0.525, PRcore = 1/2 = 0.5 is calculated. At this time, since PRclock is 0.525 and PRcore is 0.5, it is determined that lowering the clock frequency is more effective, so the clock frequency is set to 500 megahertz.

Next, when the vertical synchronization signal is input, the multi-core processor 180 displays frame data (S550).

If the calculated frame data processing time is greater than the interval time according to the vertical synchronization signal, the multi-core processor 180 determines whether the clock frequency can be set to a third clock frequency higher than the current clock frequency (S512). At this time, if the clock frequency can be set higher, the multi-core processor 180 sets the lowest clock frequency among the third clock frequencies higher than the current clock frequency as the clock frequency of the multi-core processor 180 (S514).

Next, when the clock frequency cannot be increased, it is determined whether the number of cores of the multi-core processor 180 can be increased and driven (S516). For example, when processing the frame data using two cores, the quad core processor 180 determines whether three or four cores can be used.

At this time, the multi-core processor 180 selects and drives if more cores are available than the number of cores currently driven. Meanwhile, if the number of cores currently driven is the maximum number of cores of the multi-core processor 180, the multi-core processor 180 displays frame data (S550).

Accordingly, the display processor control method according to an embodiment of the present invention, when using the multi-core processor 180, in processing the frame data within the interval time by the vertical synchronization signal, reducing the number of cores or lower the clock frequency As a result, power consumption is reduced and frame data is easily processed.

In addition, the display processor control method reduces the heat generation of the multi-core processor 180 because the method of using a lower power is more selected by comparing the method of reducing the number of cores to drive and the method of lowering the clock frequency.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

The present invention described above can be embodied as computer-readable codes on a medium on which a program is recorded. The computer readable medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of the computer-readable medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like, and also implemented in the form of a carrier wave (for example, transmission over the Internet) . Also, the computer may include a control unit 180 of the terminal.

Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

100: mobile terminal 110: wireless communication unit
120: A / V input / output unit 130: user input unit
140: sensing unit 150: output unit
160: memory 170: interface section
180: control unit 190: power supply unit

Claims (15)

Calculating frame data processing time according to at least one second clock frequency lower than a current first clock frequency of the processor; And
If the calculated processing time is shorter than an interval time from scanning one screen by a vertical synchronization (vsync, vertical synchronization) signal to scanning the next screen, the processor is driven at the second clock frequency to process frame data. Doing;
Display processor control method comprising a. The method according to claim 1,
The processing of the frame data may include processing the frame data by selecting the lowest clock frequency among the plurality of second clock frequencies when the second clock frequencies are plural. The method according to claim 1,
Calculating a frame data processing time according to the first clock frequency;
And calculating the frame data processing time according to the second clock frequency when the frame data processing time according to the first clock frequency is shorter than the interval time. The method of claim 3,
And processing the frame data by driving the processor at a third clock frequency higher than the first clock frequency when the frame data processing time according to the first clock frequency is longer than the interval time. The method according to claim 1,
And displaying the frame data processed by the driving of the processor. The method according to claim 1,
And writing the frame data processed by the driving of the processor to a memory. The method of claim 6,
And reading out and displaying the frame data recorded in the memory when the interval time ends. Calculating frame data output processing time when selecting and driving N processor cores of a multi-core processor including M cores; And
Processing the frame data by driving the predetermined number of processor cores when the calculated processing time is shorter than an inactive section time after scanning one screen from a vertical synchronization signal and scanning the next screen;
Including, M, N is a natural number, (M> N) is a display processor control method. The method of claim 8,
The calculating of the frame data processing time may include calculating frame data processing time according to driving of one or more processor cores less than the number of processor cores currently running. 10. The method of claim 9,
And processing the frame data by selecting the number of the processor cores having the calculated frame data processing time shorter than the interval time and processing the frame data. The method of claim 8,
Calculating frame data processing time of the multi-core processor according to the number of processor cores currently running;
And calculating a frame data output processing time when the N processor cores are selected and driven, when the frame data processing time according to the number of processor cores currently driven is shorter than the interval time. 12. The method of claim 11,
If the frame data processing time according to the number of processor cores currently driven is longer than the interval time, the step of processing the frame data by driving the multi-core processor with the number of processor cores more than the number of processor cores currently driven Display processor control method comprising a. The method of claim 8,
And displaying the frame data processed by the driving of the processor. The method of claim 8,
And writing the frame data processed by the driving of the processor to a memory. 15. The method of claim 14,
And reading out and displaying the frame data recorded in the memory when the interval time ends.

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