KR20160019341A - Display device and method for controlling the same - Google Patents

Abstract

Disclosed are a display device and a controlling method thereof. The display device according to an embodiment of the present invention comprises a display part and a control part, wherein the control part independently control brightness of the display part corresponding to a preset first area in a screen of the display part, and brightness of the display part corresponding to a second area except for the first area.

Description

TECHNICAL FIELD [0001] The present invention relates to a display device and a control method thereof.

The present invention relates to a display device and a control method thereof for preventing a residual image from occurring in a display portion.

Flat panel display devices such as a liquid crystal display (LCD), a plasma display panel (PDP), and an organic light emitting diode (OLED) display device are mainly used as a display device.

In particular, recently, a display device including an OLED, which has advantages of high brightness and low power consumption and does not need to have a separate backlight unit, is widely used. Particularly, in the case of a display device including such an OLED, it is a key task to prevent the appearance of sticking afterglow.

1 is a view for explaining a problem of a display device including an OLED. 1 (a) shows a TV 10 as an example of a display device, and FIG. 1 (b) shows a cellular phone 20 as an example of a display device.

Referring to FIG. 1, it can be seen that afterimages 11 and 22 appear on the screens of the display devices 10 and 20, respectively. The after-images 11 and 22 are generated due to deterioration of the OLEDs included in the display devices 10 and 20 and correspond to sticking after-images that can not be removed unless the corresponding OLED is physically replaced. Accordingly, there is a need for a method for preventing such an afterimage from occurring in advance.

The present invention is directed to solving the above-mentioned problems and other problems. Another object of the present invention is to provide a display device and a control method thereof that can prevent a residual image from occurring in an area on a screen where a logo or indicator is displayed.

Another object of the present invention is to provide a solution for preventing a user from perceiving a difference in brightness or a deterioration in image quality and at the same time preventing a residual image from being generated.

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 aspect of the present invention, there is provided a display device including a display unit for outputting video data, a memory for storing information on a detected logo area, And a control unit for controlling the brightness of at least a part of the area of the display unit including the detected logo area, wherein the control unit detects the detected logo area, Adjusts the brightness of at least a part of the area of the display part including the detected logo area when the detected logo area is continuously displayed for a predetermined time, When the stored region corresponds to the detected region of the logo, The brightness of at least a part of the region of the display portion including the detected logo region is adjusted before the passage of time.

According to an aspect of the present invention, there is provided a display apparatus including a display unit and a control unit, wherein the control unit controls the brightness of a display unit corresponding to a predetermined first area in the display unit, The luminance of the display unit corresponding to the second region except the first region is adjusted.

According to at least one of the embodiments of the present invention, it is possible to provide a display device and a control method thereof that can prevent a residual image from being generated in an area on a screen where a logo or indicator is displayed.

In addition, according to at least one embodiment of the present invention, it is possible to provide a solution for preventing a user from perceiving a difference in brightness or a deterioration in image quality, and efficiently preventing occurrence of afterimage.

Further scope of applicability of the present invention will become apparent from the following detailed description. It should be understood, however, that the detailed description and specific examples, such as the preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art.

1 is a view for explaining a problem of a display device including an OLED.
2 is a block diagram illustrating a mobile terminal as an example of a display device.
3 is a block diagram illustrating a multimedia device as another example of the display device.
FIG. 4 is a block diagram illustrating a detailed configuration of the controller of FIG. 3 according to an embodiment of the present invention.
5 is a view for explaining an example of a method for preventing afterimage in a display device according to an embodiment of the present invention.
FIG. 6 is a view for explaining an example of a method of adjusting the brightness of a display unit in a display device according to an embodiment of the present invention.
7 is a view for explaining another example of a method of adjusting the brightness of a display unit in a display device according to another embodiment of the present invention.
8 is a view for explaining an example of a method for preventing afterimage in a display device according to an embodiment of the present invention.
9 is a view for explaining an example of a method for preventing afterimage in a display device according to an embodiment of the present invention.
10 is a view for explaining an example of a method for preventing afterimage in a display device according to an embodiment of the present invention.
11 is a view for explaining an example of a logo detection algorithm used in a display device according to an embodiment of the present invention.
12 is a view for explaining another example of a logo detection algorithm used in a display device according to an embodiment of the present invention.
13 is a diagram for explaining an example of logo information stored in a display device according to an embodiment of the present invention.
14 is a view for explaining an example of a method for preventing a residual image in a display device according to an embodiment of the present invention.
15 is a view for explaining an example of indicator information stored in a display device according to an embodiment of the present invention.
16 is a flowchart for explaining an example of a method for preventing afterimage in a display device according to an embodiment of the present invention.
17 is a view for explaining an example of a method for preventing afterimage in a display device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. 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. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

The display device described in this specification can be applied to a TV, a smart TV, a network TV, a Hybrid Brodacast Broadband Television (HBBTV), an Internet TV, a Web TV, an Internet Protocol Television (IPTV) Mobile phones, smart phones, laptop computers, digital broadcasting terminals, personal digital assistants (PDAs), portable multimedia players (PMPs), navigation, slate PCs, tablet PCs a tablet PC, an ultrabook, a wearable device (e.g., a smartwatch, a glass, a head mounted display, or the like). The display device may be a PDP, an LCD, an OLED, a QD (quantum dot) display, a QD LED display, or the like.

2 is a block diagram illustrating a mobile terminal as an example of a display device.

The mobile terminal 100 includes a wireless communication unit 110, an input unit 120, a sensing unit 140, an output unit 150, an interface unit 160, a memory 170, a control unit 180, And the like. The components shown in FIG. 2 are not essential for implementing a mobile terminal, so that the mobile terminal described herein may have more or fewer components than the components listed above.

The wireless communication unit 110 may be connected between the mobile terminal 100 and the wireless communication system or between the mobile terminal 100 and another mobile terminal 100 or between the mobile terminal 100 and the external server 100. [ Lt; RTI ID = 0.0 > wireless < / RTI > In addition, the wireless communication unit 110 may include one or more modules for connecting the mobile terminal 100 to one or more networks.

The wireless communication unit 110 may include at least one of a broadcast receiving module 111, a mobile communication module 112, a wireless Internet module 113, a short distance communication module 114, and a location information module 115 .

The input unit 120 includes a camera 121 or an image input unit for inputting a video signal, a microphone 122 for inputting an audio signal, an audio input unit, a user input unit 123 for receiving information from a user A touch key, a mechanical key, and the like). The voice data or image data collected by the input unit 120 may be analyzed and processed by a user's control command.

The sensing unit 140 may include at least one sensor for sensing at least one of information in the mobile terminal, surrounding environment information surrounding the mobile terminal, and user information. For example, the sensing unit 140 may include a proximity sensor 141, an illumination sensor 142, a touch sensor, an acceleration sensor, a magnetic sensor, A G-sensor, a gyroscope sensor, a motion sensor, an RGB sensor, an infrared sensor, a finger scan sensor, an ultrasonic sensor, A microphone 226, a battery gauge, an environmental sensor (for example, a barometer, a hygrometer, a thermometer, a radiation detection sensor, A thermal sensor, a gas sensor, etc.), a chemical sensor (e.g., an electronic nose, a healthcare sensor, a biometric sensor, etc.). Meanwhile, the mobile terminal disclosed in the present specification can combine and utilize information sensed by at least two of the sensors.

The output unit 150 includes at least one of a display unit 151, an acoustic output unit 152, a haptic tip module 153, and a light output unit 154 to generate an output related to visual, auditory, can do. The display unit 151 may have a mutual layer structure with the touch sensor or may be integrally formed to realize a touch screen. The touch screen may function as a user input unit 123 that provides an input interface between the mobile terminal 100 and a user and may provide an output interface between the mobile terminal 100 and a user.

The interface unit 160 serves as a path to various types of external devices connected to the mobile terminal 100. The interface unit 160 is connected to a device having a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, And may include at least one of a port, an audio I / O port, a video I / O port, and an earphone port. In the mobile terminal 100, corresponding to the connection of the external device to the interface unit 160, it is possible to perform appropriate control related to the connected external device.

In addition, the memory 170 stores data supporting various functions of the mobile terminal 100. The memory 170 may store a plurality of application programs or applications running on the mobile terminal 100, data for operation of the mobile terminal 100, and commands. At least some of these applications may be downloaded from an external server via wireless communication. Also, at least a part of these application programs may exist on the mobile terminal 100 from the time of shipment for the basic functions (e.g., telephone call receiving function, message receiving function, and calling function) of the mobile terminal 100. Meanwhile, the application program may be stored in the memory 170, installed on the mobile terminal 100, and may be operated by the control unit 180 to perform the operation (or function) of the mobile terminal.

In addition to the operations related to the application program, the control unit 180 typically controls the overall operation of the mobile terminal 100. The control unit 180 may process or process signals, data, information, and the like input or output through the above-mentioned components, or may drive an application program stored in the memory 170 to provide or process appropriate information or functions to the user.

In addition, the controller 180 may control at least some of the components illustrated in FIG. 2 to drive an application program stored in the memory 170. In addition, the controller 180 may operate at least two of the components included in the mobile terminal 100 in combination with each other for driving the application program.

The power supply unit 190 receives external power and internal power under the control of the controller 180 and supplies power to the components included in the mobile terminal 100. The power supply unit 190 includes a battery, which may be an internal battery or a replaceable battery.

At least some of the components may operate in cooperation with one another to implement a method of operation, control, or control of a mobile terminal according to various embodiments described below. In addition, the operation, control, or control method of the mobile terminal may be implemented on the mobile terminal by driving at least one application program stored in the memory 170. [

Hereinafter, the components listed above will be described in more detail with reference to FIG. 2 before explaining various embodiments implemented through the mobile terminal 100 as described above.

First, referring to the wireless communication unit 110, the broadcast receiving module 111 of the wireless communication unit 110 receives broadcast signals 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 broadcasting signal may be encoded according to at least one of technical standards for transmitting and receiving a digital broadcasting signal (or a broadcasting system, for example, ISO, IEC, DVB, ATSC, etc.) It is possible to receive the digital broadcasting signal using a method conforming to the technical standard defined by the technical standards.

The broadcast-related information may be 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, an Electronic Program Guide (EPG) of Digital Multimedia Broadcasting (DMB) or an Electronic Service Guide (ESG) of Digital Video Broadcast-Handheld (DVB-H). 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 a mobile communication module or a mobile communication module such as a mobile communication module or a mobile communication module that uses technology standards or a communication method (e.g., Global System for Mobile communication (GSM), Code Division Multi Access (CDMA), Code Division Multi Access 2000 (Enhanced Voice-Data Optimized or Enhanced Voice-Data Only), Wideband CDMA (WCDMA), High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), Long Term Evolution And an external terminal, or a server on a mobile communication network established according to a long term evolution (AR), a long term evolution (AR), or the like.

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. The wireless Internet module 113 is configured to transmit and receive a wireless signal in a communication network according to wireless Internet technologies.

Wireless Internet technologies include, for example, wireless LAN (WLAN), wireless fidelity (Wi-Fi), wireless fidelity (Wi-Fi) Direct, DLNA (Digital Living Network Alliance), WiBro Interoperability for Microwave Access, High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), Long Term Evolution (LTE) and Long Term Evolution-Advanced (LTE-A) 113 transmit and receive data according to at least one wireless Internet technology, including Internet technologies not listed above.

The wireless Internet module 113 for performing a wireless Internet connection through the mobile communication network can be used for wireless Internet access by WiBro, HSDPA, HSUPA, GSM, CDMA, WCDMA, LTE or LTE- May be understood as a kind of the mobile communication module 112.

As for a local area communication module 114 is a short-range communication (Short range communication), Bluetooth (Bluetooth ^TM, RFID (Radio Frequency Identification), infrared data association (Infrared Data Association; IrDA), UWB (Ultra Wideband), ZigBee, NFC ( The near field communication module 114 may use at least one of Near Field Communication (FEM), Near Field Communication (FEM), Wi-Fi (Wireless-Fidelity) May be provided between the mobile terminal 100 and the wireless communication system via the wireless area networks or between the mobile terminal 100 and another mobile terminal 100 or between the mobile terminal 100 and other mobile terminals 100, Or an external server). The short-range wireless communication network may be a wireless personal area network (WLAN).

Here, the other mobile terminal 100 may be a wearable device (e.g., a smartwatch, a smart glass, etc.) capable of interchanging data with the mobile terminal 100 according to the present invention (smart glass), HMD (head mounted display)). The short range communication module 114 may detect (or recognize) a wearable device capable of communicating with the mobile terminal 100 around the mobile terminal 100. [ If the detected wearable device is a device authenticated to communicate with the mobile terminal 100 according to the present invention, the control unit 180 may transmit at least a part of the data processed by the mobile terminal 100 to the short- 114 to the wearable device. Therefore, the user of the wearable device can use the data processed by the mobile terminal 100 through the wearable device. For example, according to this, when a telephone is received in the mobile terminal 100, the user performs a telephone conversation via the wearable device, or when a message is received in the mobile terminal 100, It is possible to check the message.

The position information module 115 is a module for obtaining the position (or current position) of the mobile terminal, and a representative example thereof is a Global Positioning System (GPS) module or a Wireless Fidelity (WiFi) module. For example, when the mobile terminal utilizes the GPS module, it can acquire the position of the mobile terminal by using a signal transmitted from the GPS satellite. As another example, when the mobile terminal utilizes the Wi-Fi module, it can acquire the position of the mobile terminal based on information of a wireless access point (AP) that transmits or receives the wireless signal with the Wi-Fi module. Optionally, the location information module 115 may perform any of the other functions of the wireless communication unit 110 to obtain data relating to the location of the mobile terminal, in addition or alternatively. The location information module 115 is a module used to obtain the location (or current location) of the mobile terminal, and is not limited to a module that directly calculates or obtains the location of the mobile terminal.

Next, the input unit 120 is for inputting image information (or signal), audio information (or signal), data, or information input from a user. For inputting image information, Or a plurality of cameras 121 may be provided. The camera 121 processes an image frame such as a still image or moving image obtained by the image sensor in the video communication mode or the photographing mode. The processed image frame may be displayed on the display unit 151 or stored in the memory 170. [ A plurality of cameras 121 provided in the mobile terminal 100 may be arranged to have a matrix structure and various angles or foci may be provided to the mobile terminal 100 through the camera 121 having the matrix structure A plurality of pieces of image information can be input. In addition, the plurality of cameras 121 may be arranged in a stereo structure to acquire a left image and a right image for realizing a stereoscopic image.

The microphone 122 processes the external acoustic signal into electrical voice data. The processed voice data can be utilized variously according to a function (or a running application program) being executed in the mobile terminal 100. Meanwhile, the microphone 122 may be implemented with various noise reduction algorithms for eliminating noise generated in receiving an external sound signal.

The user input unit 123 is for receiving information from a user and when the information is inputted through the user input unit 123, the control unit 180 can control the operation of the mobile terminal 100 to correspond to the input information . The user input unit 123 may include a mechanical input means (or a mechanical key such as a button located on the front, rear or side of the mobile terminal 100, a dome switch, a jog wheel, Jog switches, etc.) and touch-type input means. For example, the touch-type input means may comprise a virtual key, a soft key or a visual key displayed on the touch screen through software processing, The virtual key or the visual key can be displayed on the touch screen with various forms. For example, the virtual key or the visual key can be displayed on the touch screen, ), An icon, a video, or a combination thereof.

Meanwhile, the sensing unit 140 senses at least one of information in the mobile terminal, surrounding environment information surrounding the mobile terminal, and user information, and generates a corresponding sensing signal. The control unit 180 may control the driving or operation of the mobile terminal 100 or may perform data processing, function or operation related to the application program installed in the mobile terminal 100 based on the sensing signal. Representative sensors among various sensors that may be included in the sensing unit 140 will be described in more detail.

First, the proximity sensor 141 refers to a sensor that detects the presence of an object approaching a predetermined detection surface, or the presence of an object in the vicinity of the detection surface, without mechanical contact by using electromagnetic force or infrared rays. The proximity sensor 141 may be disposed in the inner area of the mobile terminal or in proximity to the touch screen, which is covered by the touch screen.

Examples of the proximity sensor 141 include a transmission type photoelectric sensor, a direct reflection type photoelectric sensor, a mirror reflection type photoelectric sensor, a high frequency oscillation type proximity sensor, a capacitive proximity sensor, a magnetic proximity sensor, and an infrared proximity sensor. In the case where the touch screen is electrostatic, the proximity sensor 141 can be configured to detect the proximity of the object with a change of the electric field along the proximity of the object having conductivity. In this case, the touch screen (or touch sensor) itself may be classified as a proximity sensor.

On the other hand, for convenience of explanation, the act of recognizing that the object is located on the touch screen in proximity with no object touching the touch screen is referred to as "proximity touch & The act of actually touching an object on the screen is called a "contact touch. &Quot; The position at which the object is closely touched on the touch screen means a position where the object corresponds to the touch screen vertically when the object is touched. The proximity sensor 141 can detect 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, have. Meanwhile, the control unit 180 processes data (or information) corresponding to the proximity touch operation and the proximity touch pattern sensed through the proximity sensor 141 as described above, and further provides visual information corresponding to the processed data It can be output on the touch screen. Furthermore, the control unit 180 can control the mobile terminal 100 such that different operations or data (or information) are processed according to whether the touch to the same point on the touch screen is a proximity touch or a touch touch .

The touch sensor uses a touch (or touch input) applied to the touch screen (or the display unit 151) by using at least one of various touch methods such as a resistance film type, a capacitive type, an infrared type, an ultrasonic type, Detection.

For example, the touch sensor may be configured to convert a change in a pressure applied to a specific portion of the touch screen or a capacitance generated in a specific portion to an electrical input signal. The touch sensor may be configured to detect a position, an area, a pressure at the time of touch, a capacitance at the time of touch, and the like where a touch object touching the touch screen is touched on the touch sensor. Here, the touch object may be a finger, a touch pen, a stylus pen, a pointer, or the like as an object to which a touch is applied to the touch sensor.

Thus, when there is a touch input to the touch sensor, the corresponding signal (s) is sent to the touch controller. The touch controller processes the signal (s) and transmits the corresponding data to the controller 180. Thus, the control unit 180 can know which area of the display unit 151 is touched or the like. Here, the touch controller may be a separate component from the control unit 180, and may be the control unit 180 itself.

On the other hand, the control unit 180 may perform different controls or perform the same control according to the type of the touch object touching the touch screen (or a touch key provided on the touch screen). Whether to perform different controls or to perform the same control according to the type of the touch object may be determined according to the current state of the mobile terminal 100 or an application program being executed.

On the other hand, the touch sensors and the proximity sensors discussed above can be used independently or in combination to provide a short touch (touch), a long touch, a multi touch, a drag touch ), Flick touch, pinch-in touch, pinch-out touch, swipe touch, hovering touch, and the like. Touch can be sensed.

The ultrasonic sensor can recognize the position information of the object to be sensed by using ultrasonic waves. Meanwhile, the controller 180 can calculate the position of the wave generating source through the information sensed by the optical sensor and the plurality of ultrasonic sensors. The position of the wave source can be calculated using the fact that the light is much faster than the ultrasonic wave, that is, the time when the light reaches the optical sensor is much faster than the time the ultrasonic wave reaches the ultrasonic sensor. More specifically, the position of the wave generating source can be calculated using the time difference with the time when the ultrasonic wave reaches the reference signal.

The camera 121 includes at least one of a camera sensor (for example, a CCD, a CMOS, etc.), a photo sensor (or an image sensor), and a laser sensor.

The camera 121 and the laser sensor may be combined with each other to sense a touch of the sensing object with respect to the three-dimensional stereoscopic image. The photosensor can be laminated to the display element, which is adapted to scan the movement of the object to be detected proximate to the touch screen. More specifically, the photosensor mounts photo diodes and TRs (Transistors) in a row / column and scans the contents loaded on the photosensor using an electrical signal that varies according to the amount of light applied to the photo diode. That is, the photo sensor performs coordinate calculation of the object to be sensed according to the amount of change of light, and position information of the object to be sensed can be obtained through the calculation.

The display unit 151 displays (outputs) information processed by the mobile terminal 100. For example, the display unit 151 may display execution screen information of an application program driven by the mobile terminal 100 or UI (User Interface) and GUI (Graphic User Interface) information according to the execution screen information .

Also, the display unit 151 may be configured as a stereoscopic display unit for displaying a stereoscopic image.

In the stereoscopic display unit, a three-dimensional display system such as a stereoscopic system (glasses system), an autostereoscopic system (no-glasses system), and a projection system (holographic system) can be applied.

Generally, 3D stereoscopic images consist of left image (left eye image) and right image (right eye image). A top-down method of arranging a left image and a right image in one frame according to a method in which a left image and a right image are combined into a three-dimensional stereoscopic image, A checker board system in which pieces of a left image and a right image are arranged in a tile form, a left-to-right (right-side) Or an interlaced method in which rows are alternately arranged, and a time sequential (frame-by-frame) method in which right and left images are alternately displayed in time.

In addition, the 3D thumbnail image may generate a left image thumbnail and a right image thumbnail from the left image and right image of the original image frame, respectively, and may be generated as one image as they are combined. In general, a thumbnail means a reduced image or a reduced still image. The left image thumbnail and the right image thumbnail generated in this way are displayed on the screen with a difference of the left and right distance by the depth corresponding to the parallax between the left image and the right image, thereby exhibiting a stereoscopic spatial feeling.

The left and right images necessary for realizing the three-dimensional stereoscopic image can be displayed on the stereoscopic display unit by the stereoscopic processing unit. The stereoscopic processing unit receives a 3D image (an image at a reference time point and an image at an expansion point), sets a left image and a right image therefrom, or receives a 2D image and converts it into a left image and a right image.

The sound output unit 152 may output audio data received from the wireless communication unit 110 or stored in the memory 170 in a call signal reception mode, a call mode or a recording mode, a voice recognition mode, a broadcast reception mode, The sound output unit 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 unit 152 may include a receiver, a speaker, a buzzer, and the like.

The haptic module 153 generates various tactile effects that the user can feel. A typical example of the haptic effect generated by the haptic module 153 may be vibration. The intensity and pattern of the vibration generated in the haptic module 153 can be controlled by the user's selection or the setting of the control unit. For example, the haptic module 153 may synthesize and output different vibrations or sequentially output the vibrations.

In addition to vibration, the haptic module 153 may be configured to perform various functions such as 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, 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 153 can transmit the tactile effect through the direct contact, and the tactile effect can be felt by the user through the muscles of the finger or arm. The haptic module 153 may include two or more haptic modules 153 according to the configuration of the mobile terminal 100.

The light output unit 154 outputs a signal for notifying the occurrence of an event using the light of the light source of the mobile terminal 100. Examples of events that occur in the mobile terminal 100 may include message reception, call signal reception, missed call, alarm, schedule notification, email reception, information reception through an application, and the like.

The signal output from the light output unit 154 is implemented as the mobile terminal emits light of a single color or a plurality of colors to the front or rear surface. The signal output may be terminated by the mobile terminal detecting the event confirmation of the user.

The interface unit 160 serves as a path for communication with all external devices connected to the mobile terminal 100. The interface unit 160 receives data from an external device or supplies power to each component in the mobile terminal 100 or transmits data in the mobile terminal 100 to an external device. For example, a port for connecting a device equipped with a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, an audio I / O port, a video I / O port, an earphone port, and the like may be included in the interface unit 160.

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 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 interface unit 160. [

The interface unit 160 may be a path through which power from the cradle is supplied to the mobile terminal 100 when the mobile terminal 100 is connected to an external cradle, And various command signals may be transmitted to the mobile terminal 100. The various command signals or the power source input from the cradle may be operated as a signal for recognizing that the mobile terminal 100 is correctly mounted on the cradle.

The memory 170 may store a program for the operation of the controller 180 and temporarily store input / output data (e.g., a phone book, a message, a still image, a moving picture, etc.). The memory 170 may store data related to vibration and sound of various patterns outputted when a touch is input on the touch screen.

The memory 170 may be a flash memory type, a hard disk type, a solid state disk type, an SDD type (Silicon Disk Drive type), a multimedia card micro type ), Card type memory (e.g., SD or XD memory), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read memory, a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, and / or an optical disk. The mobile terminal 100 may operate in association with a web storage that performs the storage function of the memory 170 on the Internet.

Meanwhile, as described above, the control unit 180 controls the operations related to the application program and the general operation of the mobile terminal 100. [ For example, when the state of the mobile terminal meets a set condition, the control unit 180 can execute or release a lock state for restricting input of a user's control command to applications.

In addition, the control unit 180 performs control and processing related to voice communication, data communication, video call, or the like, or performs pattern recognition processing to recognize handwriting input or drawing input performed on the touch screen as characters and images, respectively . Further, the controller 180 may control any one or a plurality of the above-described components in order to implement various embodiments described below on the mobile terminal 100 according to the present invention.

The power supply unit 190 receives external power and internal power under the control of the controller 180 and supplies power necessary for operation of the respective components. The power supply unit 190 includes a battery, 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.

In addition, the power supply unit 190 may include a connection port, and the connection port may be configured as an example of an interface 160 through which an external charger for supplying power for charging the battery is electrically connected.

As another example, the power supply unit 190 may be configured to charge the battery in a wireless manner without using the connection port. In this case, the power supply unit 190 may use at least one of an inductive coupling method based on a magnetic induction phenomenon from an external wireless power transmission apparatus and a magnetic resonance coupling method based on an electromagnetic resonance phenomenon Power can be delivered.

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

3 is a block diagram illustrating a multimedia device as another example of the display device.

The multimedia device 200 includes a receiving unit 210, an external device interface unit 220, a memory 230, a display unit 240, an audio output unit 250, a power supply unit 260, a control unit 270, An interface unit 280, and the like.

The receiving unit 210 may include at least one tuner 211, a demodulating unit 212, and a network interface unit 213. However, in some cases, the receiving unit 210 may include the tuner 211 and the demodulator 212, but may not include the network interface unit 213, or vice versa. Although not shown, the receiving unit 210 includes a multiplexer, and multiplexes the signal demodulated by the demodulator 212 and the signal received through the network interface 213 via the tuner 211, You may. In addition, although not shown, the receiving unit 210 may include a demultiplexer to demultiplex the multiplexed signal or demultiplex the demodulated signal or the signal transmitted through the network interface unit 213 .

The tuner 211 tunes a channel selected by a user or all pre-stored channels among RF (Radio Frequency) broadcast signals received through an antenna and receives RF broadcast signals. Also, the tuner 211 converts the received RF broadcast signal into an intermediate frequency (IF) signal or a baseband signal.

For example, if the received RF broadcast signal is a digital broadcast signal, the signal is converted into a digital IF signal (DIF). If the received RF broadcast signal is an analog broadcast signal, the signal is converted into an analog baseband image or a voice signal (CVBS / SIF). That is, the tuner 211 can process both a digital broadcast signal and an analog broadcast signal. The analog baseband video or audio signal (CVBS / SIF) output from the tuner 211 can be directly input to the controller 270.

In addition, the tuner 211 can receive RF broadcast signals of a single carrier or a multiple carrier. On the other hand, the tuner 211 sequentially tunes and receives RF broadcast signals of all the broadcast channels stored through the channel storage function among the RF broadcast signals received through the antenna, converts the RF broadcast signals into intermediate frequency signals or baseband signals (DIF: Digital Intermediate Frequency or baseband signal).

The demodulator 212 may receive and demodulate the digital IF signal DIF converted by the tuner 211 and perform channel decoding. For this, the demodulator 212 may include a trellis decoder, a de-interleaver, a reed-solomon decoder, or a convolution decoder, a deinterleaver, - Solomon decoder and the like.

The demodulator 212 can demodulate and decode the channel, and output the stream signal TS. At this time, the stream signal may be a signal in which a video signal, a voice signal, or a data signal is multiplexed. For example, the stream signal may be an MPEG-2 TS (Transport Stream) multiplexed with an MPEG-2 standard video signal, a Dolby AC-3 standard audio signal, or the like.

The stream signal output from the demodulation unit 212 may be input to the control unit 270. The control unit 270 controls demultiplexing, video / audio signal processing, and the like, and controls the output of audio through the display unit 270 and the audio output through the audio output unit 250.

The external device interface unit 220 provides an interface environment between the multimedia device 200 and various external devices. To this end, the external device interface unit 220 may include an A / V input / output unit (not shown) or a wireless communication unit (not shown).

The external device interface unit 220 may be a digital versatile disk (DVD), a Blu-ray, a game device, a camera, a camcorder, a computer (notebook), a tablet PC, a smart phone, device, an external device such as a cloud, or the like. The external device interface unit 220 transmits a signal including data such as image, image, and voice input through the connected external device to the controller 270 of the multimedia device 200. The control unit 270 may control the processed image, video, audio, and the like to be output to an external device to which the data signal is connected. To this end, the external device interface unit 220 may further include an A / V input / output unit (not shown) or a wireless communication unit (not shown).

The A / V input / output unit includes a USB terminal, a Composite Video Banking Sync (CVBS) terminal, a component terminal, an S-video terminal (analog), and a video signal input terminal so that video and audio signals of an external device can be input to the multimedia device 200. [ A DVI (Digital Visual Interface) terminal, an HDMI (High Definition Multimedia Interface) terminal, an RGB terminal, a D-SUB terminal, and the like.

The wireless communication unit can perform wireless communication with another digital device. The multimedia device 100 may be, for example, a wireless LAN (WLAN), a wireless fidelity (Wi-Fi), a wireless fidelity , infrared data association (UWB), Ultra Wideband (UWB), ZigBee, and DLNA (Digital Living Network Alliance).

Also, the external device interface unit 220 may be connected to the set-top box STB through at least one of the various terminals described above to perform input / output operations with the set-top box STB.

Meanwhile, the external device interface unit 220 may receive an application or application list in an adjacent external device, and may transmit the received application or application list to the controller 270 or the memory 230.

The network interface unit 213 provides an interface for connecting the multimedia device 200 to a wired / wireless network including the Internet network. The network interface unit 213 may include an Ethernet terminal or the like for connection to a wired network and may be a WLAN (Wireless LAN) (Wi- Fi, Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), and HSDPA (High Speed Downlink Packet Access) communication standards.

The network interface unit 213 can transmit or receive data to another user or another digital device via the network to which it is connected or another network linked to the connected network. Particularly, it is possible to transmit some content data stored in the multimedia device 200 to another user registered in advance in the multimedia device 200 or a selected one of the other digital devices or a selected digital device.

On the other hand, the network interface unit 213 can access a predetermined web page through the connected network or another network linked to the connected network. That is, it is possible to access a predetermined web page through a network and transmit or receive data with the server. In addition, content or data provided by a content provider or a network operator may be received. That is, it can receive content and related information of a movie, an advertisement, a game, a VOD, a broadcast signal, and the like provided from a content provider or a network provider through a network. In addition, it can receive update information and an update file of firmware provided by the network operator. It may also transmit data to the Internet or a content provider or network operator.

In addition, the network interface unit 213 can select and receive a desired application from the open applications through the network.

The memory 230 may store a program for each signal processing and control in the control unit 270, and may also store signal-processed video, audio, or data signals.

The memory 230 may also function to temporarily store video, audio, or data signals input from the external device interface 220 or the network interface 213. The memory 230 may store information on a predetermined broadcast channel through a channel memory function.

The memory 230 may store a list of applications or applications input from the external device interface unit 220 or the network interface unit 213. [

The memory 230 may also store various platforms to be described later.

The memory 230 may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, an SD or XD memory Etc.), RAM (RAM), ROM (EEPROM, etc.), and the like. The multimedia device 200 may reproduce and provide a content file (a moving image file, a still image file, a music file, a document file, an application file, etc.) stored in the memory 230 to a user. According to an embodiment, the memory 230 may be included and implemented in the controller 270. [

The user interface unit 280 transfers a signal input by the user to the control unit 270 or a signal from the control unit 270 to the user.

For example, the user interface unit 280 receives control signals such as power on / off, channel selection, and screen setting from the remote controller 300 in accordance with various communication methods such as an RF communication method and an infrared (IR) Or transmit the control signal of the control unit 270 to the remote controller 300. [

The user interface unit 280 may transmit a control signal input from a local key (not shown) such as a power key, a channel key, a volume key, and a set value to the controller 270.

The user interface unit 280 transmits a control signal input from a sensing unit (not shown) that senses a user's gesture to the control unit 270 or a signal from the control unit 270 to a sensing unit (Not shown). Here, the sensing unit (not shown) may include a touch sensor, an audio sensor, a position sensor, an operation sensor, and the like.

The control unit 270 generates a signal for video or audio output by demultiplexing or demultiplexing a stream input through the tuner 211, the demodulator 212, or the external device interface 220 And can output.

The video signal processed by the control unit 270 may be input to the display unit 240 and displayed as an image corresponding to the video signal. The video signal processed by the controller 270 may be input to the external output device through the external device interface 220. [

The control unit 270 may include a demultiplexing unit, an image processing unit, and the like.

The control unit 270 may control the overall operation of the multimedia device 200. [ For example, the control unit 270 may control the tuner 211 to control tuning of a RF broadcast corresponding to a channel selected by the user or a previously stored channel.

The control unit 270 may control the multimedia device 200 by a user command or an internal program input through the user interface unit 280. [ In particular, the user can access a network and allow a user to download a desired application or application list into the multimedia device 200.

For example, the control unit 270 controls the tuner 211 so that a signal of a selected channel is input according to a predetermined channel selection command received through the user interface unit 280. And processes video, audio or data signals of the selected channel. The control unit 270 allows the display unit 240 or the audio output unit 250 to output the video or audio signal processed by the user through the channel information selected by the user.

For example, the control unit 270 controls the operation of the external device through the external device interface unit 220 according to the external device video playback command received through the user interface unit 280. For example, , So that a video signal or a voice signal can be output through the display unit 240 or the audio output unit 250.

Meanwhile, the control unit 270 may control the display unit 240 to display an image. For example, a broadcast image input through the tuner 211, an external input image input through the external device interface unit 220, an image input through the network interface unit 213, So that the stored image can be displayed on the display unit 240. At this time, the image displayed on the display unit 240 may be a still image or a moving image, and may be a 2D image or a 3D image.

Also, the control unit 270 can control to reproduce the content. The content at this time may be content stored in the multimedia device 200, received broadcast content, or external input content input from the outside. The content may be at least one of a broadcast image, an external input image, an audio file, a still image, a connected web screen, and a document file.

On the other hand, when entering the application viewing item, the control unit 270 can control to display a list of applications or applications that can be downloaded from the multimedia device 200 or from an external network.

The control unit 270 can control, in addition to various user interfaces, to install and operate an application downloaded from an external network. In addition, by the user's selection, it is possible to control the display unit 240 to display an image related to the executed application.

The display unit 240 converts an image signal, a data signal, an OSD signal processed by the control unit 270 or a video signal and a data signal received from the external device interface unit 220 into R, G, and B signals, respectively Thereby generating a driving signal.

The display unit 240 may be a PDP, an LCD, an OLED, a flexible display, a 3D display, or the like.

Meanwhile, the display unit 240 may be configured as a touch screen and used as an input device in addition to the output device.

The audio output unit 250 receives a signal processed by the control unit 270, for example, a stereo signal, a 3.1 channel signal, or a 5.1 channel signal, and outputs the audio signal. The audio output unit 250 may be implemented by various types of speakers.

In order to detect the gesture of the user, a sensing unit (not shown) having at least one of a touch sensor, a voice sensor, a position sensor, and an operation sensor may be further included in the multimedia device 200 . A signal sensed by a sensing unit (not shown) may be transmitted to the controller 270 through the user interface unit 280.

On the other hand, a photographing unit (not shown) for photographing a user may be further provided. The image information photographed at the photographing unit (not shown) may be input to the control unit 270. [

The control unit 270 may sense a gesture of the user by combining the images captured by the photographing unit (not shown) or the signals sensed by the sensing unit (not shown).

The power supply unit 260 supplies corresponding power to the multimedia device 200.

Particularly, it is possible to supply power to a control unit 270 that can be implemented in the form of a system-on-chip (SoC), a display unit 240 for displaying an image, and an audio output unit 250 for audio output .

To this end, the power supply unit 190 may include a converter (not shown) for converting the AC power into DC power. Meanwhile, for example, when the display unit 240 is implemented as a liquid crystal panel having a plurality of backlight lamps, an inverter (not shown) that can perform a PWM (Pulse Width Modulation) operation for variable luminance or dimming driving and an inverter (not shown).

The remote controller 300 transmits the user input to the user interface unit 280. To this end, the remote controller 300 can use Bluetooth, RF (radio frequency) communication, infrared (IR) communication, UWB (Ultra Wideband), ZigBee, or the like.

Also, the remote controller 300 can receive the video, audio, or data signal output from the user interface unit 280, display it on the remote controller 300, or output sound or vibration.

The multimedia device 200 may be a digital broadcasting receiver capable of processing digital broadcasting signals of fixed or mobile type ATSC or DVB.

In addition, the display device according to the present invention may further include a configuration that omits some of the configuration shown in FIG. On the other hand, the display device may not receive the tuner and the demodulator, and may receive and reproduce the content through the network interface unit or the external device interface unit, unlike the above.

FIG. 4 is a block diagram illustrating a detailed configuration of the controller of FIG. 3 according to an embodiment of the present invention.

The control unit 270 of the multimedia device 200 according to an embodiment of the present invention includes a demultiplexing unit 271, an image processing unit 272, an OSD generating unit 273, a mixer 274, A frame rate converter (FRC) 275, and a formatter 276. In addition, although not shown, the control unit 270 may further include a voice processing unit and a data processing unit.

The demultiplexer 271 demultiplexes the input stream. For example, the demultiplexer 271 can demultiplex the received MPEG-2 TS video, audio, and data signals. Here, the stream signal input to the demultiplexer 271 may be a stream signal output from a tuner, a demodulator, or an external device interface.

The image processing unit 272 performs image processing of the demultiplexed video signal. To this end, the image processing unit 272 may include a video decoder 272a and a scaler 272b.

The video decoder 272a decodes the demultiplexed video signal, and the scaler 272b scales the decoded video signal so that the resolution of the decoded video signal can be output from the display unit.

The video decoder 272a may support various standards. For example, the video decoder 272a performs the function of an MPEG-2 decoder when the video signal is encoded in the MPEG-2 standard, and the video decoder 272a encodes the video signal in the DMB (Digital Multimedia Broadcasting) It can perform the function of the H.264 decoder.

On the other hand, the video signal decoded by the video processor 272 is input to the mixer 274.

The OSD generating unit 273 generates OSD data according to a user input or by itself. For example, the OSD generation unit 155 generates data for displaying various data in graphic or text form on the screen of the display unit 240 based on the control signal of the user interface unit 280 . The generated OSD data includes various data such as a user interface screen (e.g., a GUI) of the multimedia device 100, various menu screens, a widget, an icon, and viewing rate information do. The OSD generating unit 274 may generate data for displaying broadcast information based on the caption of the broadcast image or the EPG.

The mixer 274 mixes the OSD data generated by the OSD generator 155 and the image signal processed by the image processor and provides the mixed image to the formatter 276. Since the decoded video signal and the OSD data are mixed, the OSD is overlaid on the broadcast image or the external input image.

A frame rate conversion unit (FRC) 275 converts the frame rate of an input image. For example, the frame rate conversion unit 275 may convert the frame rate of the input 60 Hz image to have a frame rate of 120 Hz or 240 Hz, for example, in accordance with the output frequency of the display unit. As described above, there are various methods for converting the frame rate. For example, when the frame rate is converted from 60 Hz to 120 Hz, the frame rate conversion unit 275 may insert the same first frame between the first frame and the second frame, Three frames can be inserted. As another example, when converting the frame rate from 60 Hz to 240 Hz, the frame rate conversion unit 275 may insert and convert three or more identical or predicted frames between existing frames. On the other hand, when the frame conversion is not performed, the frame rate conversion unit 275 may be bypassed.

The formatter 276 changes the output of the input frame rate converter 275 to match the output format of the display unit. For example, the formatter 276 may output R, G, B data signals, which may be output as low voltage differential signals (LVDS) or mini-LVDS . If the output from the input frame rate converter 275 is a 3D video signal, the formatter 276 constructs a 3D format corresponding to the output format of the display unit and outputs the 3D service through the display unit 240, It can also support.

On the other hand, the audio processing unit (not shown) in the control unit 270 can perform the audio processing of the demultiplexed audio signal. Such a voice processing unit (not shown) may support processing various audio formats. For example, even when a voice signal is coded in a format such as MPEG-2, MPEG-4, AAC, HE-AAC, AC-3, or BSAC, a corresponding decoder can be provided.

In addition, the audio processing unit (not shown) in the control unit 270 can process the base, the treble, the volume control, and the like.

A data processing unit (not shown) in the control unit 270 can perform data processing of the demultiplexed data signal. For example, the data processing unit can decode the demultiplexed data signal even when it is coded. Here, the encoded data signal may be EPG information including broadcast information such as a start time and an end time of a broadcast program broadcasted on each channel.

Meanwhile, the above-described multimedia device 200 is an example according to the present invention, and each component can be integrated, added, or omitted according to specifications of a display device actually implemented. That is, if necessary, two or more components may be combined into one component, or one component may be divided into two or more components. In addition, the functions performed in each block are intended to illustrate the embodiments of the present invention, and the specific operations and devices thereof do not limit the scope of rights of the present invention.

5 is a view for explaining an example of a method for preventing afterimage in a display device according to an embodiment of the present invention. Although FIG. 5 illustrates the multimedia device 200 of FIG. 3 as a display device, it is needless to say that the mobile terminal 100 of FIG. 2 may be a display device according to an embodiment.

The control unit 270 of the multimedia device 200 outputs the video data 310 through the display unit 240. [ The video data 310 may be video data included in a broadcast signal received through the tuner 211 or may be a video data provided through a network interface unit 213 such as a movie, Or video data included in content received from an external device connected through the external device interface unit 220. In this case,

The controller 270 controls the brightness of the display unit 240 corresponding to the first region in the screen of the display unit 240 and the brightness of the display unit 240 corresponding to the second region except for the first region Respectively. The first area may include at least one corner area of the four corner areas C ₁ , C ₂ , C ₃ , and C ₄ of the screen of the display unit 240. It is often the case that a logo that easily induces an afterimage is displayed in the corner area on the screen of the display part 240. Therefore, it is possible to prevent the afterimage from occurring by adjusting the brightness of the corner area and the area other than that. Here, the logo is designed to uniquely reveal a name associated with a specific company or product, and may be, for example, a letter, a figure, an image, and a combination thereof representing a broadcasting station or a program.

FIG. 6 is a diagram for explaining an example of a method of adjusting the brightness of a display unit in a display device according to an embodiment of the present invention.

6A is a graph for explaining a method for adjusting the brightness of the display unit 240 corresponding to a second region except for the first region and FIG. And a method for adjusting the luminance of the corresponding display unit 240 according to an embodiment of the present invention.

The control unit 270 detects an APL of an entire image and an APL of a partial image corresponding to the first area output through the display unit 240, The brightness level of the white light of the display unit 240 corresponding to the first region and the brightness level of the white light of the display unit 240 corresponding to the second region except for the first region.

6A, the x-axis of the graph is the APL (Average Picture Level) of the entire image output through the display unit 240, and the y-axis is the white color of the display unit 240 corresponding to the second area The brightness level of the light. The controller 270 controls the display unit 240 so that the brightness level of the white light of the display unit 240 decreases as the APL of the entire image output through the display unit 240 increases, The brightness level of the white light of the display unit 240 can be adjusted. If the APL of the entire image is low, the brightness level of the white light of the display unit 240 increases to improve the contrast. If the APL of the entire image is high, even if the brightness level of the white light of the display unit 240 is low, The brightness level of the white light of the display unit 240 can be lowered because the difference in contrast to be felt is not large.

Referring to FIG. 6B, the x-axis of the graph is the APL of the partial image output through the first area among the entire images output through the display unit 240, and the y- (240). The controller 270 controls the display unit 240 to display the second function whose brightness level of the white light of the display unit 240 increases as the APL of the partial image corresponding to the first area increases from the entire image output through the display unit 240 The brightness level of the white light of the display unit 240 corresponding to the first area can be adjusted. In the case where the logo is displayed on the first area and the APL of the partial image corresponding to the first area is low, the luminance difference between the logo and the surrounding area of the logo is reduced, When the APL of the partial image corresponding to the first area is high, the luminance difference between the logo and the surrounding area of the logo is not large and the probability of occurrence of the residual image is low, The brightness level of the white light of the white light can be increased.

7 is a view for explaining another example of a method of adjusting the brightness of a display unit in a display device according to another embodiment of the present invention.

7A is a graph for explaining a method for adjusting the brightness of the display unit 240 corresponding to a second region except for the first region, FIG. 7B is a graph for explaining an example of a process of deriving the graph of FIG. 7C. FIG. 7B is a graph for explaining a method for adjusting the brightness of the corresponding display unit 240. FIG.

The control unit 270 detects an APL of an entire image and an APL of a partial image corresponding to the first area output through the display unit 240, The brightness level of the white light of the display unit 240 corresponding to the first region and the brightness level of the white light of the display unit 240 corresponding to the second region that does not include the first region.

Referring to FIG. 7A, the x-axis of the graph is the APL of the entire image output through the display unit 240, and the y-axis is the brightness level of the white light of the display unit 240 corresponding to the second area. The controller 270 controls the display unit 240 so that the brightness level of the white light of the display unit 240 decreases as the APL of the entire image output through the display unit 240 increases, The brightness level of the white light of the display unit 240 can be adjusted. Since the graph of FIG. 7A is the same as the graph of FIG. 6A, detailed description thereof will be omitted.

Referring to FIG. 7C, the x-axis of the graph is the APL of the partial image output through the first area among the entire images output through the display unit 240, and the y- (240). When the APL of the partial image corresponding to the first area among the entire images output through the display unit 240 is less than or equal to a preset degree, the control unit 270 increases the APL of the partial image corresponding to the first area When the luminance level of the white light of the display unit 240 increases and the APL of the partial image corresponding to the first area exceeds the predetermined level, the APL of the partial image corresponding to the first area increases The brightness level of the white light of the display unit 240 corresponding to the first area can be adjusted based on the third function that the brightness level of the white light of the display unit 240 decreases. In the case where the logo is displayed on the first area and the APL of the partial image corresponding to the first area is low, the luminance difference between the logo and the surrounding area of the logo is reduced, When the APL of the partial image corresponding to the first area is high, the luminance difference between the logo and the surrounding area of the logo is not large and the probability of occurrence of the afterimage is small, but the display unit 240 The brightness level of the white light of the display unit 240 can be lowered as in the second region because the difference in contrast of the user is not so large even if the brightness level of the white light of the display unit 240 is low. For example, the graph of FIG. 7 (c) can be derived from the product of the first function corresponding to the graph of FIG. 7 (a) and the second function corresponding to the graph of FIG. 7 (b).

8 is a view for explaining an example of a method for preventing afterimage in a display device according to an embodiment of the present invention. Although FIG. 8 illustrates the multimedia device 200 of FIG. 3 as a display device, it is needless to say that the mobile terminal 100 of FIG. 2 may be a display device according to an embodiment.

The control unit 270 of the multimedia device 200 may output the first screen 400 to the display unit 240. [ For example, the first screen 400 may be a home screen, an execution screen of a specific application, a live broadcast screen, or the like.

The controller 270 controls the luminance of the display unit 240 corresponding to the first region and the luminance of the display unit 240 corresponding to the second region except for the first region, Respectively. The first area may include an image, a letter, a figure, an indicator, a graphic, or the like which is easy to cause a residual image as a predetermined area according to what the first screen 400 currently displayed on the display unit 240 is . The memory 230 may store information on the size, position, and shape of the first area corresponding to each of the screens output to the display unit 240. [

In the present embodiment, the first screen 400 may be a home screen. For example, the first screen 400 may include a broadcast screen area 410 for outputting a live broadcast signal, a first menu area 420 associated with a specific channel or application, a second menu area 430 associated with a specific content, And an app launcher area 440 in which certain applications are listed. For example, the first area in the first screen 400 is output through at least one corner area of the four corner areas 411 to 414 in the broadcasting screen area 410 through the broadcasting screen area 410 An area 421 for describing the first menu area 420, an area 431 for describing the second menu area 430, an app launcher area 440, And an area 450 corresponding to the setting menu.

The control unit 270 detects the APL of the entire image output through the display unit 240 and the APL of the partial image corresponding to the first area and displays the APL of the partial image corresponding to the first area on the display unit 240, The brightness level of the white light of the display unit 240 and the brightness level of the white light of the display unit 240 corresponding to the second region that does not include the first region. The method of controlling the brightness level of the white light of the display unit 240 corresponding to the first area and the second area of the controller 270 is the same as described above with reference to FIGS. 6 and 7, do.

9 is a view for explaining an example of a method for preventing afterimage in a display device according to an embodiment of the present invention. Although FIG. 9 illustrates the mobile terminal 100 of FIG. 2 as a display device, it is needless to say that the multimedia device 200 of FIG. 3 may be a display device according to an embodiment.

The control unit 180 of the mobile terminal 100 may output the second screen 500 to the display unit 151. [ For example, the second screen 500 may be a home screen, a lock screen, an execution screen of a specific application, a live broadcast screen, or the like.

The controller 180 controls the brightness of the display unit 151 corresponding to the predetermined first region and the brightness of the display unit 151 corresponding to the second region except for the first region, Respectively. The first area is a predetermined area according to what is currently set in the predetermined area or the second screen 500 currently displayed on the display part 151. The first area may be an image, font, figure, indicator, And the like. The memory 170 may store information on the size, position, form, etc. of the first area.

In the present embodiment, the second screen 500 may be a home screen. The first area may include at least one of the top, bottom, left end, and right end of the display unit 151. For example, the first area of the second screen 500 includes an area 510 corresponding to a notification bar for notifying the status of the mobile terminal 100 and the occurrence of an event, An area 520 including an indicator indicating a menu for returning to a previous screen, an indicator indicating a menu for returning to a previous screen, and an indicator corresponding to a menu for confirming the history of applications used within a predetermined time, And an area 530 associated with the page turning function for movement.

The controller 180 detects the APL of the entire screen output through the display unit 151 and the APL of the partial screen corresponding to the first area and displays the APL on the display unit 151 corresponding to the first area, The brightness level of the white light of the display unit 151 and the brightness level of the white light of the display unit 151 corresponding to the second region that does not include the first region. Since the control unit 180 controls the brightness level of the white light of the display unit 151 corresponding to the first area and the second area as described above with reference to FIGS. 6 and 7, a detailed description thereof will be omitted do.

10 is a view for explaining an example of a method for preventing afterimage in a display device according to an embodiment of the present invention. Although FIG. 10 illustrates the multimedia device 200 of FIG. 3 as a display device, it is needless to say that the mobile terminal 100 of FIG. 2 may be a display device according to an embodiment.

The control unit 270 of the multimedia device 200 outputs the video data 310 through the display unit 240. [ The video data 310 may be video data included in a broadcast signal received through the tuner 211 or may be a video data provided through a network interface unit 213 such as a movie, Or video data included in content received from an external device connected through the external device interface unit 220. In this case,

The control unit 270 detects a logo region included in the video data 310 output through the display unit 240 and adjusts the brightness of at least a portion of the display unit 240 including the detected logo region .

11 is a view for explaining an example of a logo detection algorithm used in a display device according to an embodiment of the present invention.

The control unit 270 may compare the pixels in the same area between the previous and next frames to detect a portion with a small difference in the pixel as the logo area.

Referring to FIG. 11, a first frame 610 and a second frame 620 are shown. The first frame 610 and the second frame 620 may be adjacent to each other and a predetermined number of frames may exist between the first frame 610 and the second frame 620. [ The first frame 610 and the second frame 620 include a first logo L ₁ indicating the program name of the specific program, a second logo L ₂ indicating the subtitle or contents of the specific program, And a third logo L ₃ indicating a channel for transmitting the third logo L ₃ .

The control unit 270 can compare the pixels of the same area between the first frame 610 and the second frame 620 and detect a portion of the pixel whose difference is less than a preset degree as a logo region. Since the portion of the same area between the first frame 610 and the second frame 620 having a small difference is a portion corresponding to a still image, this portion is detected as a logo region.

According to the embodiment, when detecting the logo area, the control unit 270 may compare the pixels of the same area only with respect to the corner areas of the first frame 610 and the second frame 620. [ Since the probability that a logo exists in the corner area of the screen of the display unit 240 is high, the speed of the logo detection is improved and the accuracy is enhanced.

12 is a view for explaining another example of a logo detection algorithm used in a display device according to an embodiment of the present invention.

The control unit 270 divides one frame 630 into a plurality of blocks B and counts pixels corresponding to the still images for each block B to determine whether or not the still image exists for each of the blocks B, It is possible to detect the logo area by comparing each frame.

According to the embodiment, the control unit 270 may detect the logo area using the logo information stored in the memory 230. [ This will be described with reference to FIG.

13 is a diagram for explaining an example of logo information stored in a display device according to an embodiment of the present invention.

The memory 230 of the multimedia device 200 may store logo information. A logo is designed to uniquely reveal a name associated with a particular company or product, for example, letters, figures, images, and combinations thereof representing a broadcast station or program.

The logo information may be stored in the memory 230 for each specific channel, in the memory 230 for each specific program, or in the memory 230 for each specific video file.

When the logo information is stored in the memory 230 for each specific channel, the logo information includes information on the type of the logo corresponding to the specific channel, information on the area where the logo corresponding to the specific channel is displayed on the screen, And information on the time when the logo corresponding to the channel is displayed on the screen. For example, the information related to the area where the logo corresponding to the specific channel is displayed on the screen may be information indicating which area the logo is located on the screen of the display unit 240, And may include accurate coordinate information for the entire region displayed as a logo on the display unit. The information about the area where the logo corresponding to the specific channel is displayed on the screen may be absolute position information rather than absolute position information because the size of the display unit 240 may be different for each multimedia device 200. [

When the logo information is stored in the memory 230 for each specific program, the logo information includes information on the type of the first logo corresponding to the specific program, the form of the second logo corresponding to the channel for transmitting the specific program Information about an area where the first logo is displayed on the screen, information about an area where the second logo is displayed on the screen, information about a time when the first logo is displayed on the screen, And information on the time when the display screen is displayed on the screen. The information about the area in which the first logo and the second logo are displayed on the screen is similar to that described above with respect to the information about the area in which the logo corresponding to the specific channel is displayed on the screen, and a detailed description thereof will be omitted.

According to an embodiment, the logo information may be stored in the memory 230 for each specific video file. For example, when the multimedia device 200 is a display device displayed on a sales floor or a signage installed on a building lobby, a moving picture outputted to the display unit 240 may include a logo of a manufacturer of the multimedia device 200 It is common for the building to contain the company's logo. Accordingly, the logo information may be mapped to the video file created according to the specific purpose and stored in the memory 230.

The logo information may be received from the external server through the network interface unit 213. [ The logo information may be updated periodically or aperiodically. For example, the logo information may be updated together with an upgrade of the software or firmware of the multimedia device 200, or may be updated in an internet using environment through the network interface unit 213. [

The external server can obtain logo information by analyzing the content received from the content provider, and map the secured logo information with the information related to the content to construct a database of the logo information.

For example, referring to FIG. 13, the logo information may be divided into programs and stored in the memory 230. The logo information includes information on the type of the first logo corresponding to the specific program, information on the type of the second logo corresponding to the channel for transmitting the specific program, information on the area where the first logo is displayed on the screen Information about an area on which the second logo is displayed on the screen, information about a time when the first logo is displayed on the screen, and information about a time when the second logo is displayed on the screen .

According to an embodiment, the control unit 270 may utilize the logo information stored in the memory 230 when detecting the logo area as described above with reference to FIG. The control unit 270 extracts logo information corresponding to the specific program from the logo information stored in the memory 230 and displays the logo information in the first frame 610 and the second frame 620 based on the extracted logo information. 1 logo (L ₁ ), the second logo (L ₂ ), and the third logo (L ₃ ), respectively. For example, the control unit 270 may select a portion of the pixel whose difference is less than a preset degree as a logo candidate region, and determine a first logo (L ₁₎ based on the logo information corresponding to the specific program among the selected logo candidate regions ), The second logo (L ₂ ), and the third logo (L ₃ ), respectively, as the logo area. In another example, the control unit 270 determines whether or not the first logo (L ₁ ), the second logo (L ₂ ), and the third logo (L ₃ ) (L ₁ ), the second logo (L ₂ ), and the third logo (L ₃ ) are actually present in the respective positions when the difference between the pixels is smaller than the preset portion It is possible to determine an area corresponding to the first logo L ₁ , the second logo L ₂ and the third logo L ₃ as the logo area.

In addition, according to the embodiment, the controller 270 may use the logo information stored in the memory 230 even when detecting the logo area as described above with reference to Fig.

Referring again to FIG. 10, the controller 270 may adjust the brightness of at least a part of the display area 240 including the logo areas L ₁ , L ₂ , and L ₃ detected as described above. The control unit 270 detects the APL of the entire image corresponding to the video data 310 and detects the detected logo regions L ₁ , L ₂ and L ₃ and the detected logo regions L ₁ , L ₂ , L ₃ ) of the partial image corresponding to the first area including the peripheral area of the first area. In this embodiment, the first area, the display unit of four corner areas of the screen of _{(240) (C 1, C} 2, C 3, C 4) the detected logo area (L _1, of the L _2, L ₃₎ the two corner regions (C _1, C ₂₎ comprising a may be. The controller 270 controls the brightness level of the white light of the display unit 240 corresponding to the first area and the brightness level of the white light of the display unit 240 corresponding to the second area that does not include the first area, Respectively.

The method of controlling the brightness level of the white light of the display unit 240 corresponding to the first area and the second area of the controller 270 is the same as described above with reference to FIGS. 6 and 7, do.

FIG. 14 is a view for explaining an example of a method for preventing afterimage in a display device according to an embodiment of the present invention, and FIG. 15 is a flowchart illustrating an example of indicator information stored in a display device according to an embodiment of the present invention. Fig. Although FIGS. 14 and 15 illustrate the mobile terminal 100 of FIG. 2 as a display device, it is needless to say that the multimedia device 200 of FIG. 3 may be a display device according to an embodiment.

The control unit 180 of the mobile terminal 100 may output the second screen 500 to the display unit 151. [ For example, the third screen 700 may be a home screen, a screen lock screen, an execution screen of a specific application, a live broadcast screen, or the like.

The control unit 180 of the mobile terminal 100 can detect the indicator area included in the third screen 700 based on the indicator information stored in the memory 170. [ For example, the third screen 700 may be a home screen, a screen lock screen, an execution screen of a specific application, a live broadcast screen, or the like.

Here, the indicator means letters, figures, images, and combinations thereof to indicate the current state of the mobile terminal 100, the occurrence of a specific event, a specific application, a specific menu, and the like.

For example, the indicator includes an indicator for indicating the reception sensitivity of the radio signal, an indicator for indicating the capacity of the remaining battery, an indicator for indicating to which communication network the radio signal is transmitted and received with the external server, An indicator indicating a mobile communication company, an indicator indicating a menu for entering a main home screen, an indicator indicating a menu for returning to a previous screen, a history of applications used within a predetermined time, An indicator corresponding to a menu for displaying a specific application, and an indicator indicating a specific application.

The indicator information may include at least one of information about the type of indicator, information about an area where the indicator is displayed on the screen, information about a function associated with the indicator, information about an event related to the indicator, and information on when the indicator is displayed . For example, the information on the area where the indicator is displayed on the screen may be information indicating how the indicator is located on the screen of the display unit 151, or may be information indicating an area displayed as an indicator on the screen of the display unit 151 And may include accurate coordinate information for the whole.

The indicator information may be stored in the memory 170 during manufacture of the mobile terminal 100 or may be received from an external server via the wireless communication unit 110 or may be updated together with software or firmware upgrades of the mobile terminal 100. [ . The external server may be building a database of indicator information according to the manufacturer, model name, and version information of the mobile terminal 100.

For example, referring to FIG. 15, the memory 170 may store, for each indicator, information about the type of indicator, information describing the indicator, information about the area where the indicator is displayed on the screen, and information about when the indicator is displayed May be stored.

For example, in the case of the first indicator, information indicating the type of the first indicator and whether the mobile terminal 100 is currently transmitting and receiving a radio signal through the communication network and receiving sensitivity of the radio signal are described Information indicating where the first indicator is displayed on the screen of the display unit 151 and information indicating whether the first indicator is displayed when the Wi-Fi communication function among the functions of the mobile terminal 100 is activated Information may be stored in the memory 170.

Referring again to FIG. 14, the control unit 180 can detect an indicator area included in the third screen 700 based on the indicator information stored in the memory 170. FIG. For example, the control unit 180 detects the currently activated function among the functions of the mobile terminal 100, extracts indicator information related to the detected function from the indicator information stored in the memory 170, It is possible to detect the indicator region corresponding to the indicator displayed on the display section 151 based on the indicator information. In another example, the controller 180 detects the occurrence of a specific event, extracts indicator information related to the sensed event from among the indicator information stored in the memory 170, and, based on the extracted indicator information, It is possible to detect an indicator region corresponding to the indicator displayed on the display unit 151. [

For example, in the present embodiment, the indicator region detected according to the above description includes an area 710 including an indicator indicating the current state of the mobile terminal 100, an indicator indicating a menu for entering the main home screen, An area 720 including an indicator indicating a menu for returning to a screen and an indicator corresponding to a menu for confirming a history of applications used within a predetermined time, a page turning function for moving between pages constituting a home screen, An area 730 that includes an associated area 730 and an indicator for announcing the generated event.

The control unit 180 may adjust the brightness of at least a part of the display unit 151 including the detected indicator region. The controller 180 detects the APL of the entire screen output through the display unit 151 and the APL of the partial screen corresponding to the first area and displays the APL on the display unit 151 corresponding to the first area, The brightness level of the white light of the display unit 151 and the brightness level of the white light of the display unit 151 corresponding to the second region that does not include the first region. Since the control unit 180 controls the brightness level of the white light of the display unit 151 corresponding to the first area and the second area as described above with reference to FIGS. 6 and 7, a detailed description thereof will be omitted do.

16 is a flowchart for explaining an example of a method for preventing afterimage in a display device according to an embodiment of the present invention. Although FIG. 16 illustrates the multimedia device 200 of FIG. 3 as a display device, it is needless to say that the mobile terminal 100 of FIG. 2 may be a display device according to an embodiment.

The control unit 270 of the multimedia device 200 outputs the video data to the display unit 240 (S801). The video data may be video data included in the broadcast signal received through the tuner 211 or may be video data included in a movie, an advertisement, a game, a VOD, a broadcast signal provided from a content provider or a network provider through the network interface unit 213 Or may be video data included in content received from an external device connected through the external device interface unit 220. [

The control unit 270 stores information on the detected logo area (S802). The control unit 270 may detect a logo area in the video data output through the display unit 240 and store information on the detected logo area in the memory 230. [ The video data may be video data output in step S801 or video data output through the display unit 240 before step S801. The information on the detected logo region may include at least one of information on the shape of the logo region and information on the position of the logo region on the screen of the display unit 240.

The control unit 270 detects the logo area in the video data being output in step S801 (S803). The method by which the control unit 270 detects the logo region in the video data is similar to that described above with reference to Figs. 11 to 13, and thus a detailed description thereof will be omitted.

The control unit 270 determines whether the logo area detected in step S803 corresponds to the information on the previously detected logo area stored in the memory 230 (S8040). That is, the controller 270 determines whether or not there is information corresponding to the logo area detected in step S803 among the information on the detected logo area stored in the memory 230. [

If the logo area detected in step S803 does not correspond to the information on the previously detected logo area stored in the memory 230 (S804, NO), the controller 270 determines whether the detected logo area is preset It is detected whether it is continuously displayed on the display unit 240 for a predetermined time (S805).

If the detected logo region is continuously displayed on the display unit 240 for a predetermined time period (S805, YES), the control unit 270 determines whether the logo region is displayed on the display unit 240 The brightness of some areas is adjusted (S806). In the case where an area estimated as a logo is detected, only when the detection of the logo area lasts for a predetermined time or longer, the area is regarded as a true logo area so as to control the brightness of the display part 240 to prevent afterimage.

On the other hand, when the logo area detected in step S803 corresponds to the information on the previously detected logo area stored in the memory 230 (YES in step S804), the controller 270 determines whether the detected logo area corresponds to The brightness of at least a part of the area of the display unit 240 including the detected logo area is adjusted irrespective of whether the information is continuously displayed on the display unit 240 for a predetermined time (S806). The logo area detected in step S803 may not be displayed in the memory 230 because the logo may be temporarily or temporarily disappeared and displayed again depending on the kind of the broadcast program or the content. It is possible to promptly cope with a logo which temporarily or temporarily disappears for a moment and repeats to be displayed again by applying a brightness control method for preventing afterimage directly to the detected logo area.

The method of controlling the brightness of the display unit 240 by the control unit 270 in step S806 is similar to that described above with reference to FIGs. 6 and 7, so a detailed description thereof will be omitted.

17 is a view for explaining an example of a method for preventing afterimage in a display device according to an embodiment of the present invention. Although FIG. 16 illustrates the multimedia device 200 of FIG. 3 as a display device, it is needless to say that the mobile terminal 100 of FIG. 2 may be a display device according to an embodiment. Hereinafter, the method described above with reference to FIG. 16 will be described in detail with reference to FIG.

The control unit 270 of the multimedia device 200 outputs the video data 810 to the display unit 240. Since the video data 810 corresponds to a moving picture, a screen displayed on the display unit 240 according to time may vary.

Referring to FIG. 17A, the controller 270 detects the logo areas L ₁ and L ₂ included in the video data 810 output through the display unit 240. The method of detecting the logo region is similar to that described above with reference to FIGS. 10 to 13, and thus a detailed description thereof will be omitted. The control unit 270 may store information on the detected logo regions L ₁ and L ₂ in the memory 230 as information on the detected logo region. The information on the detected logo region may include at least one of information on the shape of the logo region and information on the position of the logo region on the screen of the display unit 240.

The control unit 270 adjusts the brightness of at least a partial area of the display unit 240 including the detected logo regions L ₁ and L ₂ . For example, when the detected logo regions L ₁ and L ₂ are continuously displayed on the display unit 240 for a predetermined period of time, the controller 270 determines that the detected logo regions L ₁ and L ₂ , The brightness of at least a part of the area of the display unit 240 may be adjusted.

Referring to FIG. 17B, the controller 270 detects a logo area L ₂ included in the video data 810 output through the display unit 240. The control unit 270 determines whether the detected logo region L ₂ corresponds to the information on the previously detected logo region stored in the memory 230. Control unit 270, since the correspondence with the information on the logo area (L _1, L ₂₎ detecting the pre-stored in the detected logo area (L _2), the memory 230, the detected logo area (L ₂ The brightness of at least a part of the area of the display unit 240 may be adjusted. That is, the display unit 240 that includes the detected logo area (L _2), a group without determining whether the displayed continuously on for a set time display part 240, the detected logo area (L ₂₎ The brightness of at least a part of the region can be adjusted.

According to the embodiment, when the detected logo region L ₂ does not correspond to the information about the previously detected logo region L ₁ , L ₂ stored in the memory 230, Information on the detected logo area L ₂ may be stored in the memory 230. Only when a detected logo region L ₂ is continuously displayed on the display unit 240 for a predetermined time, the logo region L ₂ is displayed on at least a portion of the display region 240 including the detected logo region L ₂ The brightness can be adjusted.

Referring to FIG. 17C, the logo area L ₁ and L ₂ included in the video data 810 output through the display unit 240 are detected. The control unit 270 determines whether the detected logo regions L ₁ and L ₂ correspond to the information about the previously detected logo region stored in the memory 230. The controller 270 determines that the detected logo area L ₁ and L ₂ correspond to the information on the previously detected logo area L ₁ and L ₂ stored in the memory 230, (L ₁ , L ₂ ) of the display unit 240 including the detected logo regions (L ₁ , L ₂ ) without determining whether or not the displayed logo regions L ₁ , L ₂ are continuously displayed on the display unit 240 for a predetermined time The luminance of at least some regions can be adjusted.

As described above, according to at least one of the embodiments of the present invention, it is possible to prevent a residual image from occurring in an area on the screen where the logo or indicator is displayed.

In addition, according to at least one of the embodiments of the present invention, it is possible to prevent the user from recognizing the difference in brightness or the deterioration of the image quality, and at the same time, the occurrence of the afterimage effectively.

The present invention described above can be implemented 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 a hard disk drive (HDD), a solid state disk (SSD), a silicon disk drive (SDD), a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, , And may also be implemented in the form of a carrier wave (e.g., transmission over the Internet). Also, the computer may include a control unit of the terminal. Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

100: mobile terminal
200: Multimedia device

Claims (14)

A display unit for outputting video data;
A memory for storing information on the detected logo area; And
And a controller for detecting a logo area included in the output video data and adjusting a brightness of at least a part of the display area including the detected logo area,
Wherein,
When the detected logo area is not corresponding to the previously detected logo area stored in the memory, when the detected logo area is continuously displayed for a predetermined time, at least a part of the area of the display part including the detected logo area Lt; / RTI >
And adjusts the brightness of at least a part of the area of the display part including the detected logo area before the predetermined time elapses if the detected logo area corresponds to the previously detected logo area stored in the memory, . The method according to claim 1,
Wherein the information on the detected logo area includes at least one of information on the shape of the logo area and information on the position of the logo area on the screen of the display part. The method according to claim 1,
When controlling the brightness of at least a partial area of the display unit including the detected logo area,
Detects an APL (Average Picture Level) of the entire image corresponding to the video data,
Detecting an APL of a partial image corresponding to a first region including the detected logo region and a peripheral region of the detected logo region,
And adjusts the brightness level of white light of the display unit corresponding to the first area and the brightness level of white light of the display unit corresponding to the second area that does not include the first area. The method of claim 3,
The brightness level of the white light of the display unit corresponding to the second area is adjusted based on a first function that the brightness level of the white light of the display unit decreases as the APL of the whole image increases,
Wherein the brightness level of the white light of the display unit corresponding to the first area is adjusted based on a second function that the brightness level of the white light of the display unit increases as the APL of the partial image corresponding to the first area increases, . The method of claim 3,
The brightness level of the white light of the display unit corresponding to the second area is adjusted based on a first function that the brightness level of the white light of the display unit decreases as the APL of the whole image increases,
When the APL of the partial image corresponding to the first area is equal to or less than a preset level, the brightness level of the white light of the display unit corresponding to the first area is determined such that the APL of the partial image corresponding to the first area increases, When the brightness level of the light increases and the APL of the partial image corresponding to the first region exceeds the predetermined level, the brightness level of the white light of the display unit decreases as the APL of the partial image corresponding to the first region increases And is adjusted based on a third function. The method of claim 3,
When the APL of the partial image corresponding to the first area is equal to or less than a predetermined level, the brightness level of the white light of the display unit corresponding to the first area is lower than the brightness level of the white light of the display unit corresponding to the second area, . The method of claim 3,
Wherein the first area includes at least one corner area of the four corner areas of the screen of the display part. A display unit; And
And a control unit,
Wherein,
And adjusts the brightness of the display unit corresponding to the first area set in the screen of the display unit and the brightness of the display unit corresponding to the second area except for the first area. 9. The method of claim 8,
Wherein the first area includes at least one corner area of the four corner areas of the screen of the display part. 9. The method of claim 8,
Wherein the first area includes at least one of an upper end, a lower end, a left end, and a right end of a screen of the display unit. 9. The method of claim 8,
Wherein,
An APL of an entire image output through the display unit and an APL of a partial image corresponding to the first area,
And adjusts the brightness level of the white light of the display unit corresponding to the first area and the brightness level of the white light of the display unit corresponding to the second area that does not include the first area according to the sensed APL. 12. The method of claim 11,
The brightness level of the white light of the display unit corresponding to the second area is adjusted based on a first function that the brightness level of the white light of the display unit decreases as the APL of the whole image increases,
Wherein the brightness level of the white light of the display unit corresponding to the first area is adjusted based on a second function that the brightness level of the white light of the display unit increases as the APL of the partial image corresponding to the first area increases, . 12. The method of claim 11,
The brightness level of the white light of the display unit corresponding to the second area is adjusted based on a first function that the brightness level of the white light of the display unit decreases as the APL of the whole image increases,
When the APL of the partial image corresponding to the first area is equal to or less than a preset level, the brightness level of the white light of the display unit corresponding to the first area is determined such that the APL of the partial image corresponding to the first area increases, When the brightness level of the light increases and the APL of the partial image corresponding to the first area exceeds the predetermined level, the brightness level of the white light of the display unit decreases as the APL of the partial image corresponding to the first area increases And is adjusted based on a third function. 12. The method of claim 11,
When the APL of the partial image corresponding to the first area is equal to or less than a predetermined level, the brightness level of the white light of the display unit corresponding to the first area is lower than the brightness level of the white light of the display unit corresponding to the second area, .

Images