Patent Publication Number: US-10310676-B2

Title: Image projection apparatus and operation method thereof

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is the National Stage filing under 35 U.S.C. 371 of International Application No. PCT/KR2015/008366, filed on Aug. 10, 2015, and also claims the benefit of earlier filing date and right of priority to Korean Patent Application Nos. 10-2015-0071272, filed on May 21, 2015 and 10-2015-0017547, filed on Feb. 4, 2015, the contents of which are all hereby incorporated by reference herein in their entirety. 
     TECHNICAL FIELD 
     The present invention relates to an image projection apparatus and an operating method thereof, and more particularly to an image projection apparatus and an operating method thereof, capable of determining a state of an image projection area, to which an image is projected, and of performing an operation corresponding to the determined state of the image projection area. 
     BACKGROUND ART 
     Recently, a manner of displaying an image may include not only a manner of displaying an image inside a device similarly to a display device, but also a manner of projecting an image to a predetermined area similarly to a projector. 
     According to the displaying of the image through the display device, there are a limitation in the size of a screen on which the image is displayed and a difficulty in displaying the image on an area other than the screen of the display device. 
     Meanwhile, an image projection apparatus, such as a projector, may provide a screen larger than that of the display device and may display the image on various positions depending on directions of projecting the image. 
     Meanwhile, recently, an input manner of allowing a user to directly touch a screen displayed on the display device through various touch manners has been extensively used. According to the user input manner based on the touch manner, the user may directly perform a touch motion to the displayed screen, so that the user may intuitively recognize the input manner or the user manner. 
     However, the image projection apparatus may not receive the user input through the touch manner due to the feature that there is absent a specific display in the image projection apparatus. 
     In addition, in the case of the image projection apparatus, if there is present an obstacle between a point, to which the image is projected, and the image projection apparatus, the projected image may be hidden. In addition, if the user is directly exposed to the projected image, the eyesight of the user may be damaged. 
     The above disadvantages of the image projection apparatus may need to be solved. 
     DISCLOSURE 
     Technical Problem 
     An object of the present invention is to provide an image projection apparatus capable of projecting an image to various positions, thereby increasing the utilization of a space and improving an outer appearance. 
     Another object of the present invention is to determine the state of an image projection area, to which an image is projected, and to project the image corresponding to the determined image projection area, thereby providing a pleasant viewing environment for a user. 
     Another object of the present invention is to recognize a user input to the projected screen and thus to perform a control operation for the projected image. 
     Technical Solution 
     According to an embodiment of the present invention, an operating method of an image projection apparatus includes sensing a distance to an image projection area to which an image is projected; determining, based on the sensed distance, an image projection state including a state of at least one of the image projection area and a space between the image projection apparatus and the image projection area; and projecting, based on the determined image projection state, the image on the image projection area. 
     According to an embodiment of the present invention, an image projection apparatus includes an image projection unit that projects an image; a sensing unit that senses a distance to an image projection area to which an image is projected; and a control unit that determines, based on the sensed distance, an image projection state including a state of at least one of the image projection area and a space between the image projection apparatus and the image projection area, and performs a control operation such that an image is projected to the image projection area based on the determined image projection state. 
     According to another embodiment of the present invention, an operating method of an image projection apparatus includes projecting an image including at least one menu to an image projection area; sensing a first distance for a user input corresponding to the menu; and performing, based on the sensed first distance, an operation corresponding to the menu. 
     According to another embodiment of the present invention, an image projection apparatus includes an image projection unit that projects an image including at least one menu to an image projection area; a distance sensor that senses a first distance for a user input corresponding to the menu; and a control unit that performs, based on the sensed first distance, an operation corresponding to the menu. 
     Advantageous Effects 
     According to various embodiments of the present invention, the image projection apparatus according to the present invention may project the image to various positions, thereby increasing the utilization of a space and improving an outer appearance. 
     In addition, according to the present invention, the state of an image projection area, to which an image is projected, may be determined, and the image corresponding to the determined image projection area may be projected, thereby providing a pleasant viewing environment for the user. 
     In addition, according to the present invention, the user input to the projected image may be recognized so that the operation and the function desired by the user may be easily performed. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a block diagram illustrating an image projection apparatus according to an embodiment of the present invention. 
         FIG. 2  is a conceptual view illustrating image projection, when viewed in one direction, according to an embodiment of the present invention. 
         FIG. 3  is a conceptual view illustrating image projection, when viewed in another direction, according to an embodiment of the present invention. 
         FIG. 4  is a view illustrating a case according to an embodiment of the present invention. 
         FIG. 5  is a view illustrating a case to which an image is projected according to an embodiment of the present invention. 
         FIG. 6  is a block diagram illustrating a remote controller according to an embodiment of the present invention. 
         FIG. 7  is a view illustrating an actual configuration of the remote controller according to an embodiment of the present invention. 
         FIG. 8  is a flowchart illustrating an operating method of the image projection apparatus according to an embodiment of the present invention. 
         FIG. 9  is a flowchart illustrating the detailed operation of the image projection apparatus according to an embodiment of the present invention. 
         FIG. 10  is a view illustrating distance sensing of a distance sensor according to an embodiment of the present invention. 
         FIG. 11  is a conceptual view illustrating obstacle recognition according to an embodiment of the present invention. 
         FIG. 12  is a view illustrating image projection for avoiding an obstacle according to an embodiment of the present invention. 
         FIG. 13  is a view illustrating image projection to an adjacent door according to an embodiment of the present invention. 
         FIG. 14  is a view illustrating sensing to a user input according to an embodiment of the present invention. 
         FIG. 15  is a view illustrating a UI display screen according to an embodiment of the present invention. 
         FIG. 16  is a view illustrating door open recognition according to an embodiment of the present invention. 
         FIG. 17  is a view illustrating image projection to an adjacent door according to another embodiment of the present invention. 
         FIG. 18  is a conceptual view illustrating image projection according to another embodiment of the present invention. 
         FIG. 19  is a view illustrating image projection to a door according to an embodiment of the present invention. 
         FIG. 20  is a view illustrating image projection to a wall surface according to an embodiment of the present invention. 
         FIG. 21  is a view illustrating an actual configuration of an audio output device according to an embodiment of the present invention. 
         FIG. 22  is a view illustrating the audio output device according to an embodiment of the present invention. 
         FIG. 23  is a conceptual view illustrating image projection according to an embodiment of the present invention. 
         FIG. 24  is a conceptual view illustrating image projection according to an embodiment of the present invention. 
         FIG. 25  is a flowchart illustrating an operating method of the image projection apparatus according to an embodiment of the present invention. 
         FIG. 26  is a view illustrating distance sensing to a sensing area according to an embodiment of the present invention. 
         FIG. 27  is a view illustrating a plurality of sensing areas according to an embodiment of the present invention. 
         FIG. 28  is a view illustrating a plurality of sensing areas according to another embodiment of the present invention. 
         FIG. 29  is a view illustrating a plurality of sensing areas according to still another embodiment of the present invention. 
         FIG. 30  is a view illustrating a trigger operation in an up-down direction according to an embodiment of the present invention. 
         FIG. 31  is a view illustrating a trigger operation in an up-down direction according to an embodiment of the present invention. 
         FIG. 32  is a view illustrating the displaying of an operation selection menu according to an embodiment of the present invention. 
         FIG. 33  is a view illustrating the displaying of a channel menu according to an embodiment of the present invention. 
         FIG. 34  is a view illustrating the displaying of a volume menu according to an embodiment of the present invention. 
         FIG. 35  is a view illustrating the displaying of an operation selection menu according to another embodiment of the present invention. 
         FIG. 36  is a view illustrating the displaying of an operation selection menu according to another embodiment of the present invention. 
     
    
    
     BEST MODE 
     Mode for Invention 
     Hereinafter, embodiments relating to the present invention will be described in detail with reference to the accompanying drawings. The suffixes “module” and “unit” for components used in the description below are assigned or mixed in consideration of easiness in writing the specification and do not have distinctive meanings or roles by themselves. 
     Hereinafter, an operating method of an image projection apparatus and the image projection apparatus using the same according to an embodiment of the present invention will be described in detail. 
     The image projection apparatus according to an embodiment of the present invention, which is, for example, an intelligent image projection apparatus in which a computer aid function is added to a broadcast reception function, may perform sufficiently the broadcast reception function while additionally performing the Internet function. Accordingly, the image projection apparatus may have an interface, such as voice command recognition, gesture motion recognition, a handwriting input device, a touch screen or a space remote control, which is convenient for use. In addition, the image projection apparatus allows the user to access the Internet and a computer to perform a function, such as an e-mail, web-browsing, banking, or playing a game, as a wired or wireless Internet function is supported. A general standard operating system (OS) may be used for the various functions. 
     Therefore, the image projection apparatus set forth in the present disclosure may perform various user-friendly functions since various applications may be, for example, freely added or deleted on a general OS kernel. The image projection apparatus may be an image projector in more detail. If necessary, the image projection apparatus is applicable to a smart phone. 
       FIG. 1  is a block diagram illustrating the image projection apparatus according to an embodiment of the present invention. 
     Referring to  FIG. 1 , the image projection apparatus  100  may include a sensing unit  105 , a voice acquisition unit  110 , an image acquisition unit  120 , a broadcast reception unit  130 , an external device interface unit  135 , a storage unit  140 , a user input interface unit  150 , a communication unit  160 , a control unit  170 , an image projection unit  180 , an audio output unit  185 , and a power supply unit  190 . 
     The sensing unit  105  may include at least one sensor which senses at least one of include internal information of the image projection apparatus, surrounding information of the image projection apparatus, and user in. 
     For example, the sensing unit  105  may at least one of a distance sensor  106 , a proximity sensor, an illuminance sensor, a touch sensor, an acceleration sensor, a magnetic sensor, a G-sensor, a gyroscope sensor, a motion sensor  107 , an RGB sensor, an infrared sensor (IR sensor), a finger scan sensor, an ultrasonic sensor, an optical sensor, a battery gauge, and an environmental sensor (e.g., a barometer, a hygrometer, a thermometer, a radiation sensor, a thermal sensor, a gas sensor, etc.), a chemical sensor (e.g., an electronic nose, a health care sensor, or a biometric sensor). Meanwhile, the image projection apparatus  100  disclosed in the present specification may utilize the combination of information sensed by at least two sensors of the above sensors. 
     The distance sensor  106  may include at least one sensor which is able to sense a distance. 
     According to an embodiment, the distance sensor  106  may include an IR sensor to sense a distance to various objects or a point to which an image is projected. For example, the IR sensor included in the distance sensor  106  may output an infrared light and may recognize an infrared light, which is formed as the output infrared light is reflected from an object, by an image sensor included in the distance sensor  106 . 
     The distance sensor  106  may include various sensors in addition to the IR sensor. For example, the distance sensor  106  may include an ultrasonic sensor and may output light having remaining wavelengths other than the wavelength of the infrared light. The detailed operation of the distance sensor  106  will be described below. 
     Meanwhile, the sensing unit  105  may recognize the state of an area, to which the image is projected, by sensors additionally provided in the sensing unit  105 . 
     For example, the sensing unit  105  may acquire information on the movement of the area, to which the image is projected, from a magnet type sensor or a switch type sensor provided in the area to which the image is projected. 
     The voice acquisition unit  110  may acquire voice. 
     The voice acquisition unit  110  may include at least one microphone. Accordingly, the voice acquisition unit  110  may acquire voice through the microphone. 
     The voice acquisition unit  110  may deliver the acquired voice to the control unit  170 . 
     The image acquisition unit  120  may acquire an image. 
     The image acquisition unit  120  may include at least one camera. Accordingly, the image acquisition unit  120  may acquire the image through the included camera. Accordingly, the image acquisition unit  120  may capture an image of a user. In addition, the image acquisition unit  120  may acquire images related to bio-information, such as the iris or the vein, of the user. 
     The image acquisition unit  120  may deliver the acquired image to the control unit  170 . 
     Meanwhile, the voice acquisition unit  110  and the image acquisition unit  120  may be included in the user input interface unit  150 . 
     Meanwhile, the broadcast reception unit  130  may include a tuner  131 , a demodulation unit  132 , and a network interface unit  133 . 
     The external device interface unit  135  may receive internal applications of an adjacent external device or the list of the internal applications and may deliver the internal applications or the list of the internal applications to the control unit  170  or the storage unit  140 . 
     The external device interface unit  135  may include a terminal for connection with the external device and thus may be connected with a connector of the external device. 
     The external device interface unit  135  may supply power, which is received from a power supply unit  190 , to the connected external device. 
     In addition, the external device interface unit  135  may deliver an operating signal, which is transmitted by the external device, to the control unit  170 . 
     Since the external device interface unit  135  may include a sensor which senses the connection with the external device, the external device interface unit  135  may recognize the connection with the external device. 
     The network interface unit  133  may provide an interface to connect the image projection apparatus  100  with a wired/wireless network including the Internet. The network interface unit  133  may transmit or receive data from or to another user or another electronic device through the accessed network or another network linked with the accessed network. 
     In addition, part of content stored in the image projection apparatus  100  may be transmitted to a user or an electronic device selected among other users or other electronic devices which are previously registered in the image projection apparatus. 
     The network interface unit  133  may access a predetermined web-page through the accessed network or another network linked with the accessed network. In other words, the network interface unit  133  may access the predetermined web-page through the network to transmit or receive data to or from a relevant server. 
     In addition, the network interface unit  133  may receive content or data provided by a content provider or a network operator. In other words, the network interface unit  133  may receive content, such as a movie, an advertisement, a game, a video on Demand (VOD) or a broadcasting signal, and information related to the content from the content provider or a network provider through a network. 
     In addition, the network interface unit  133  may receive update information and update file of firmware provided by the network operator and may transmit data to the Internet, the content provider, or the network operator. 
     The network interface unit  133  may select and receive a desired one of applications open to the public through the network. 
     The storage unit  140  may store a program for signal processor and controlling inside the control unit  170  and may store a video, voice, or a data signal subject signal processing. 
     In addition, the storage unit  140  may perform a function of temporarily storing the video, the voice, or the data signal input from the external device interface unit  135  or the network interface unit  133  and may store information on a predetermined image through a function of memorizing a channel. 
     The storage unit  140  may store an application or an application list input from the external device interface unit  135  or the network interface unit  133 . 
     In addition, the storage unit  140  may store bio-information of a user. In this case, the bio-information of the user may refer to intrinsic information, such as information on the fingerprint, the iris, the vein, the face, or the voice of the user, related to the body of the user. 
     The image projection apparatus  100  may reproduce a content file (e.g., a moving picture file, a still image file, a music file, a document file, an application file, or the like) stored in the storage unit  140 . 
     The storage unit  140  may store personalization service information of the user. In this case, the personalization service information on the user may include information on at least one of a function frequently used by a user, a channel and content frequently viewed by the user, and a setting value set by the user. In addition, the personalization service information on the user may include information on a personalized function or a personalized menu for each of a plurality of users. 
     The user input interface unit  150  may deliver a signal, which is input by the user, to the control unit  170  or may deliver a signal from the control unit  170  to the user. For example, the user input interface unit  150  receives and processes a control signal for power on/off signal, channel selection, or screen setting from a remote controller  200  according to various communication schemes, such as Bluetooth, Ultra Wideband (UWB), a ZigBee scheme, a Radio Frequency (RF) communication scheme, or an IR communication scheme. Alternatively, the user input interface unit  150  may perform processing to transmit a control signal from the control unit  170  to the remote controller  200 . 
     In addition, the user input interface unit  150  may transmit, to the control unit  170 , a control signal input from a power key, a channel key, a volume key, or a local key (not shown) such as a setting value. 
     The communication unit  160  may include one or more modules that enable wired communication or wireless communication between the image projection apparatus  100  and the network or between the image projection apparatus  100  and a peripheral device. 
     For example, the communication unit  160  may include an Internet module for Internet connection and may allow the image projection apparatus  100  to connect to the Internet through the Internet module via the wired or wireless communication. 
     Alternatively, the communication unit  160  may include a short-range communication module that enables wireless communication between the image projection apparatus  100  and another device. According an embodiment, the short-range communication module included in the communication unit  160  may use Bluetooth, Radio Frequency Identification (RFID), infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, Wireless LAN (WLAN) (Wi-Fi), Near Field Communication (NFC), or the like. 
     An image signal that is image-processed by the control unit  170  may be input to an image projection unit  180 , and an image corresponding to the image signal may be displayed thereon. In addition, the image signal that is image-processed by the control unit  170  may be input to an external output device through the external device interface unit  135 . 
     The voice signal that is processed by the control unit  170  may be output to the audio output unit  185 . In addition, the voice signal that is processed by the control unit  170  may be input to an external device through the external device interface unit  135 . 
     In addition, the control unit  170  may transmit the processed voice signal to an audio output device  300 , which is described later, and may control the audio output device  300  to output audio. 
     In addition, the control unit  170  may control an overall operation of the video display device  100 . 
     The control unit  170  may receive a sensing signal based on the connection with the external device from the external device interface unit  135  and may control the power supply unit  190  to deliver driving power to the external device connected through the external device interface unit  135 . 
     In addition, the control unit  170  may recognize voice acquired through the voice acquisition unit  110  and may perform a control operation corresponding to the recognized voice. 
     In addition, the control unit  170  may compare a plurality of voice signals for the voice of the user with each other, may recognize voice a voice signal representing the most excellent quality, and may perform a control operation corresponding to the recognized voice. 
     The control unit  170  may determine a position of a user by comparing a plurality of voices acquired from the voice acquisition unit  110  including a plurality of microphones. Specifically, the control unit  170  may determine a position of the user who utters a voice by comparing voices acquired by the microphones. 
     On the other hand, the control unit  170  may control the image projection apparatus  100  by a user command input through the user input interface unit  150  or an internal program and may connect to the network to download an application or an application list desired by the user into the image projection apparatus  100 . 
     The control unit  170  may output channel information selected by the user through the image projection unit  180  or the audio output unit  185  together with the processed image or voice signal. 
     In addition, the control unit  170  may output the image signal or the voice signal, which is input from the external device, for example, a camera or a camcorder, through the external device interface unit  135 , to the image projection apparatus  180  or the audio output unit  185  according to an external device image reproduction command received through the user input interface unit  150 . 
     On the other hand, the control unit  170  may control the image projection unit  180  to display an image. For example, the control unit  170  may control the image projection unit  180  to display a broadcast image input through the tuner  131 , an external input image input through the external device interface unit  135 , an image input through the network interface unit, or an image stored in the storage unit  140 . In this case, the image displayed on the image projection unit  180  may be a still image or a moving image, or may be a 2D image or a 3D image. 
     Additionally, the control unit  170  may perform control to reproduce content stored in the image projection apparatus  100 , received broadcast content, or external input content input from the outside. The content may be various types, such as a broadcast image, an external input image, an audio file, a still image, a connected web screen, a document file, and the like. 
     In addition, the control unit  170  may compare at least one of input bio-information and pattern information of the user with at least one of bio-information and pattern information which are previously stored. Accordingly, the control unit  170  may search for bio-information, which is the same as input bio-information of the user, from at least one of the bio-information and the pattern information which are previously stored. 
     In addition, the control unit  170  may acquire personalized service information of the user corresponding to at least one of the bio-information and the pattern information, which are input, based on at least one of the bio-information and the pattern information of the user, which are input. For example, the control unit  180  may recognize the user based on a fingerprint image of the received user or the information on the fingerprint. The control unit  180  may acquire personalized service information corresponding to the recognized user. 
     In addition, the control unit  170  may adjust an image to be projected based on the distance to the image projection area which is a point to which the image is projected. 
     In addition, the control unit  170  may determine an image projection state including a state of at least one of the image projection area and a space between the image projection apparatus  100  and the image projection area based on a sensing value of the distance sensor  106 . In addition, the control unit  170  may detect a user input for the image projection area based on the sensing value by the distance sensor  106 , which will be described later. 
     The image projection unit  180  may project various images. 
     The image projection unit  180  may include a light source unit  181 , a lens unit  182 , and a reflection unit  183 . 
     The light source unit  181  emits beam. 
     The lens unit  182  selectively transmits only a predetermined wavelength of the beam emitted from the light source unit  181 . The lens unit  182  may include a plurality of lenses according to designs. 
     The reflection unit  183  reflects the beam transmitted through the lens unit  182 . In addition, the reflection unit  183  is rotatable in up-down and left-right directions and may reflect the transmitted beam in various directions. 
     The image projection unit  180  may project an image to a projection point as the beam emitted from the light source unit  181  passes through the lens unit  182 . 
     In addition, the image projection unit  180  may project the image to the projection point as the beam emitted from the light emitting unit  181  passes through the lens unit  182 , and is reflected from the reflection unit  183 . 
     The details thereof will be made with reference to  FIGS. 2 and 3 . 
       FIG. 2  is a conceptual view image projection, when viewed in one direction, according to an embodiment of the present invention. 
     Referring to  FIG. 2 , the image projection apparatus  100  may be provided in the case  400  and may project an image to a door  410  of the case  400 . In detail, the image projection apparatus  100  allows the light source unit  181  included in the image projection unit  180  to emit beam and allows the emitted beam to pass through the lens unit  182  and to be reflected from the reflection unit  183  such that the image is projected to the door  410  which is the projection point. Accordingly, an image screen  500 , on which the image projected from the image projection unit  180  is displayed, may be displayed on a door  410  of the case  400 . 
     In this case, the door  410  may be a door of the case  400 . The door  410  may have a detachable structure or a structure that is open in one direction. 
     In addition, the door  410  may be a transparent structure or an opaque structure. For example, the door  410  may be formed of a glass material. In addition, a sheet may be attached to the door  410  such that the image is clearly displayed. 
     Meanwhile, the image projection apparatus  100  may be provided outside the case  400 . 
     In this case, the case  400  may be furniture. For example, the case  400  may be a storage closet or living room furniture. In addition, the case  400  may be a portion or the entire portion of furniture. 
       FIG. 3  is a conceptual view image projection, when viewed in another direction, according to an embodiment of the present invention. 
     In detail, the image projection unit  180  of the image projection apparatus  100  allows the light source unit  181  to emit beam and allows the emitted beam to pass through the lens unit  182  and to be reflected from the reflection unit  183  such that the image is projected to the door  410  which is the projection point. Accordingly, the image screen  500 , on which the image projected from the image projection unit  180  is displayed, may be displayed on a door  410  of the case  400 . 
     The detailed embodiment of displaying the image projected from the image projection unit  180  will be described with reference to  FIGS. 4 and 5 . 
       FIG. 4  is a view illustrating a case according to an embodiment of the present invention. 
     Referring to  FIG. 4 , the case  400  may be furniture including at least one receiving space or at least one decoration space. Accordingly, the case  400  may include at least one door  410 . In addition, the door  410  may be formed of a transparent material or an opaque material. Accordingly, when the image is not projected, the door  410  may have a general door form. 
       FIG. 5  is a view illustrating a case to which an image is projected according to an embodiment of the present invention. 
     Referring to  FIG. 5 , the image projected by the image projection apparatus  100  may be projected to the door  410  of the case  400 . Accordingly, the image screen  500  may be displayed depending on the image projected to the entire portion or the portion of the door  410 . 
     The image projection unit  180  may project the image to a point to the image is to be projected such that the image screen  500  may be displayed. 
     In addition, the image projection apparatus  100  may project the image to various areas or an object in addition to the door  410 . The details thereof will be described below. 
     Meanwhile, the image projection unit  180  may project the image except the reflection procedure of the reflection unit  183 . Therefore, as the beam generated from the light source unit  181  passes through the lens unit  182 , the image may be projected to the point to which the image is to be projected. 
     Since the image projection method of the image projection unit  180  is generally known, the details thereof will be omitted. 
     The image projection unit  180  may convert an image signal, a data signal, or an OSD signal, which is processed by the control unit  170 , or an image signal or a data signal, which is received from the external device interface unit  135 , into R, G, and B signals to generate a driving signal. 
     The image projection apparatus  100  illustrated in  FIG. 1  is provided for the illustrative purpose according to an embodiment of the present invention. Some of the illustrated elements may be integrated, added, or omitted depending on the specifications of the image projection apparatus  100  which is actually realized. 
     In other words, if necessary, at least two elements may be integrated into one component, or one element may be sub-divided into at least two elements. In addition, the function performed in each block is provided for the illustrative purpose according to an embodiment of the present invention, and the detailed operation or the device for the same does not limit the scope of the present invention. 
     According to another embodiment of the present invention, the image projection apparatus  100  may receive and reproduce an image through the network interface unit  133  or the external device interface unit  135  without including the tuner  131  and the demodulation unit  132 , differently from those of  FIG. 1 . 
     For example, the image projection apparatus  100  may be implemented by including an image processing device, such as a set-top box, for receiving content based on a broadcast signal or various network services and a content reproduction device for reproducing content input from the image processing device. 
     In this case, an image display method according to an embodiment of the present invention, which is to be described below, may be performed by any one of the image processing device, such as the set-top box, or the content reproduction device including the image projection unit  180  and the audio output unit  185 , as well as the image projection apparatus  100  that has been described with reference to  FIG. 1 . 
     Hereinafter, the description of the remote controller according to an embodiment of the present invention will be described with reference to  FIGS. 6 to 7 . 
       FIG. 6  is a block diagram illustrating the remote controller according to an embodiment of the present invention and  FIG. 7  is a view illustrating an actual configuration of a remote controller according to an embodiment of the present invention. 
     First, referring to  FIG. 6 , a remote controller  200  may include a fingerprint recognition unit  210 , a wireless communication unit  220 , a user input unit  230 , a sensor unit  240 , an output unit  250 , a power supply unit  260 , a storage unit  270 , a control unit  280 , and a voice acquisition unit  290 . 
     The wireless communication unit  220  transmits/receives signals to/from an arbitrary any one of image display devices according to the above-mentioned embodiments of the present invention. 
     The remote controller  200  may include a radio frequency (RF) module  221  for transmitting/receiving signals to/from the image projection apparatus  100  according to the RF communication standards and an IR module  223  for transmitting/receiving signals to/from the image projection apparatus  100  according to the IR communication standards Additionally, the remote controller  200  may include a Bluetooth module  225  for transmitting/receiving signals to/from the image projection apparatus  100  according to the Bluetooth communication standards. In addition, the remote controller  200  may include an NFC module  227  for transmitting/receiving signals to/from the image projection apparatus  100  according to the Near Field Communication (NFC) communication standards and a WLAN module  229  for transmitting/receiving signals to/from the image projection apparatus  100  according to the Wireless LAN (WLAN) communication standards. 
     In addition, the remote controller  200  may transmit signals containing information on a movement of the remote controller  200  to the image projection apparatus  100  through the wireless communication unit  220 . 
     Moreover, the remote controller  200  may receive signals transmitted from the image projection apparatus  100  through the wireless communication unit  220  and if necessary, may transmit a command on power on/off, channel change, and volume change to the image projection apparatus  100  through the wireless communication unit  220 . 
     The user input unit  230  may be configured with a keypad button, a touch pad, wheel key or a touch screen. A user may manipulate the user input unit  230  to input a command relating to the image projection apparatus  100  to the remote controller  200 . If the user input unit  230  includes a hard key button, a user may input a command relating to the image projection apparatus  100  to the remote controller  200  through the push operation of the hard key button. This will be described with reference to  FIG. 7 . 
     Referring to  FIG. 7 , the remote controller  200  may include a plurality of buttons. The plurality of buttons may include a fingerprint recognition button  212 , a power button  231 , a home button  232 , a LIVE button  233 , an external input button  234 , a volume button  235 , a voice recognition button  236 , a channel button  237 , a wheel key  238 , and a cancellation button  239 . 
     The fingerprint recognition button  212  may be a button for recognizing a user fingerprint. According to an embodiment, the fingerprint recognition button  212  may perform a push operation and may receive a push operation and a fingerprint recognition operation. 
     The power button  231  may be a button for tuning on or off the power of the image projection apparatus  100  or an external device. 
     The home button  232  may be a button for displaying a basic menu of the image projection apparatus  100 . 
     The LIVE button  233  may be a button for displaying real-time broadcast program. 
     The external input button  234  may be a button for displaying an image received from the external device. 
     The volume button  235  may be a button for adjusting an audio output of the image projection apparatus  100 . 
     The voice recognition button  236  may be a button for recognizing the voice of a user. 
     The channel button  237  may be a button for receiving a broadcast signal of a specific broadcast channel or a specific broadcast service. 
     The wheel key  238  may be a wheel-formed key for receiving a user input in at least one direction. For example, the wheel key  238  may be a wheel-formed key for receiving a user input in an up-down direction or up-down and left-right direction. In addition, the wheel key  238  may further include a directional key. In this case, the up-down directional user input to the wheel key  238  may be a user input for rotating the wheel key  238 . The left-right user input to the wheel key  238  may be a user input for tilting the wheel key  238 . In addition, the wheel key  238  may receive a push input. 
     The LIVE button  297  may be a button for displaying the real-time broadcast program. 
     Description will be made again with reference to  FIG. 6 . 
     When the user input unit  230  includes a touch screen, a user touches to a soft key of a touch screen such that the user may input a command related to the image projection apparatus  100  by the remote controller  200 . 
     In addition, the user input unit  230  may include various types of input units, such as a scroll key, a jog key, a touch pad, or the like, that is manipulated by the user. The present embodiment is not limited to the scope of the present invention. 
     The sensor unit  240  may include a gyro sensor  241  or an acceleration sensor  243 , and the gyro sensor  241  may sense information on the movement of the remote controller  200 . 
     For example, the gyro sensor  241  may sense the information on the movement of the remote controller  200  in x, y, and z axes. The acceleration sensor  243  may sense the information on the movement speed of the remote controller  200 . Meanwhile, the remote controller  200  may further include a distance measurement sensor. Accordingly, the remote controller  200  may sense the distance from the display unit  180 . 
     The output unit  250  may output an image signal or a voice signal corresponding to the manipulation of the user input unit  235  or corresponding to the signal transmitted from the image projection apparatus  100 . The user may recognize the manipulation state of the user input unit  235  or the control state of the image projection apparatus  100  through the output unit  250 . 
     For example, the output unit  250  may include a Light Emitting Diode (LED) module  251  turned on when the user input unit  230  has been manipulated or a signal is transmitted to or received from the image projection apparatus  100  through the wireless communication unit  220 , a vibration module  253  for generating vibrations, an audio output module  255  for outputting audio, or a display module  257  for outputting a video. 
     The power supply unit  260  supplies power to the remote controller  200 . When the remote controller  200  is kept stationary for a predetermined time, the power supply unit  260  cuts off the supply of the power, thereby preventing waste of the power. When a predetermined key of the remote controller  200  is manipulated, the power supply unit  260  may resume power supply. 
     The storage unit  270  may store various types of programs or application data required for the control or the operation of the remote controller  200 . When the remote controller  200  transmits and receives signals to and from the image projection apparatus  100  wirelessly through the RF module  221 , the remote controller  200  and the image projection apparatus  100  perform signal transmission and reception in a predetermined frequency band. 
     The control unit  280  of the remote controller  200  may store information on the frequency band of wirelessly transmitting and receiving signals to and from the image projection apparatus  100  paired with the remote controller  200  in the storage unit  270  and refer to the information. 
     The control unit  280  provides overall control to the remote controller  200 . The control unit  280  may transmit a signal corresponding to predetermined key manipulation on the user input unit  230  or a signal corresponding to the movement of the remote controller  200 , which is sensed by the sensor portion  240  to the image display device  100  through the radio transceiver  220 . 
     The voice acquisition unit  290  of the remote controller  200  may acquire voice. 
     The voice acquisition unit  290  may include at least one microphone. Accordingly, the voice acquisition unit  110  may acquire voice through the microphone. 
     The voice acquisition unit  290  may deliver the acquired voice to the control unit  280 . 
     Hereinafter, the operating method of the image projection apparatus  100  will be described based on the description of the image projection apparatus  100 . 
       FIG. 8  is a flowchart illustrating an operating method of the image projection apparatus according to an embodiment of the present invention. 
     Referring to  FIG. 8 , the sensing unit  105  of the image projection apparatus  100  senses a distance to the image projection area to which an image is projected (S 110 ). 
     The sensing unit  105  may sense the distance to the image projection area to which the image is projected through various sensors. For example, the sensing unit  105  may sense the distance to the image projection area, to which the image is projected, through the distance sensor  106 . 
     The distance to the image projection area to which the image is projected may refer to the distance between the image projection apparatus  100  and the image projection area. Accordingly, the sensing unit  105  may sense the distance to an object or an area between the image projection apparatus  100  and the image projection area. 
     In addition, the sensing unit  105  may sense the distance to an area going beyond the above-described image projection area. For example, if the door  410  of the case  400  is the image projection area, the sensing unit  105  may sense the distance to the area going beyond the door  410 . Accordingly, the sensing unit  105  may sense a user input to the image projection area. In this case, the user input may include a user input which is a touch to the door  410  to which the image is projected and a user input in the proximity to the door  410  within a predetermined distance from the door  410 . The details thereof will be described below. 
     The control unit  170  of the image projection apparatus  100  determines at least one of the state of the image projection area based on the sensed distance, the state of the environment between the image projection apparatus  100  and the image projection area, and the state of the user input for the image projection area (S 130 ). 
     The control unit  170  may determine the state of the image projection area based on the sensed distance. 
     According to an embodiment, the control unit  170  may determine the state of the door  410  of the case  400  which is the image projection area, based on the sensed distance. For example, the control unit  170  may determine the door  410  to be open if the sensed distance is equal to or more than a first distance which is a distance to the door  410  to which the image is projected. Accordingly, the control unit  170  may determine the open state of the door  410 . 
     In addition, the control unit  170  may determine, based on the sensed distance, whether the image projection area is another area instead of a portion of the case  400 . For example, the control unit  170  may determine the image projection area to be another area instead of the portion of the case  400  if the sensed distance is a second distance which is equal to or greater than the first distance. 
     According to another embodiment, the control unit  170  may determine the state of the environment between the image projection apparatus  100  and the image projection area, based on the sensed distance. For example, the control unit  170  may determine a certain object to be present between the door  410  and the image projection apparatus  100  if the sensed distance is less than the first distance which is a distance to the door  410  to which the image is projected. Accordingly, the control unit  170  may determine a portion or the entire portion of an image to be projected to the determined object without arriving at the door  410  to which a portion or the entire portion of the door  410  is to be projected, depending on the positions of the determined object. Accordingly, the control unit  170  may determine the portion or the entire portion of the image not to arrive at the door  410  which serves as the image projection area. 
     According to another embodiment, the control unit  170  may determine the state of the user input to the image projection area, based on the sensed distance. For example, the control unit  170  may determine the state of the user input to the image projection area, to which the image is projected, based on the variation of the sensing value corresponding to the sensed distance. According to an embodiment, the control unit  170  may recognize the user input to the door  410  based on the variation of the sensing value to the door  410  to which the image is projected. In this case, the user input may include a user input which is a touch to the door  410  to which the image is projected and a user input in the proximity to the door  410  within a predetermined distance from the door  410 . 
     The control unit  170  of the image projection apparatus  100  operates based on the determined image projection state (S 150 ). 
     According to an embodiment, the control unit  170  may reduce the brightness of an image, which is being projected, or may project the image to another area if the control unit  170  determines the state of the door  410  of the case  400  to be open. 
     According to another embodiment, if the control unit  170  determines the distance till an area, to which the image is projected, to be changed, the control unit  170  may project the image corresponding to the changed distance. Therefore, the control unit  170  may adjust at least one of the focus, the resolution, the size, the brightness, the color, and the lightness of the image projected by the image projection apparatus  180 . 
     According to another embodiment, if the control unit  170  determines a certain object to be present between the image projection apparatus  100  and the image projection area, and if a portion or the entire portion of the image to be projected does not arrive at the image projection area due to the object, the control unit  170  may display an alarm, which notifies the presence of the obstacle related to image projection, on the image. In addition, the control unit  170  may output an alarm, which notifies the presence of the obstacle, in the form of audio through the audio output unit  185 . 
     According to another embodiment, if the control unit  170  determines the user input to the image projection area to be recognized, the control unit  170  may operate based on the determined user input. For example, the control unit  170  may recognize the user input related to the operation of the image projection apparatus  100  and may perform the operation corresponding to the recognized user input. In this case, the user input related to the operation of the image projection apparatus  100  may be a user input for various operations such as image converting for the image displayed by the image projection apparatus  100 , volume control for the output audio, and turning on and off of the image projection apparatus  100 . 
     Meanwhile, the detailed embodiment of the operation of the image projection apparatus  100  will be described in detail. 
       FIG. 9  is a flowchart illustrating the detailed operation of the image projection apparatus according to an embodiment of the present invention. 
     Referring to  FIG. 9 , the sensing unit  105  of the image projection apparatus  100  senses a distance to the image projection area to which an image is projected (S 200 ). 
     Then sensing unit  105  may include a distance sensor  106 , and the distance sensor  106  may include a plurality of distance sensors  106   a ,  106   b ,  106   c , and  106   d . In addition, each of the distance sensors may sense the distance to the image projection area to which the image is projected. 
     The details thereof will be described with reference to  FIG. 10 . 
       FIG. 10  is a view illustrating distance sensing of a distance sensor according to an embodiment of the present invention. 
     Referring to  FIG. 10 , the distance sensor  106  may include the distance sensors  106   a ,  106   b ,  106   c , and  106   d . Each of the distance sensors  106   a ,  106   b ,  106   c , and  106   d  may sense the distance to the door  410  serving as an area to which the image is projected. Meanwhile, areas sensed by the distance sensors  106   a ,  106   b ,  106   c , and  106   d  may be partially or entirely overlapped with each other. Accordingly, the distance sensors  106   a ,  106   b ,  106   c , and  106   d  may sense mutually different areas. In addition, the number of distance sensors included in the distance sensor  106  may be varied, and the distance sensors may be provided at various positions of the image projection apparatus  100 . Accordingly, the distance sensors included in the distance sensor  106  may sense distances at various angles or various directions with respect to the area to which the image is projected. 
     Since the sensing of the distance by the sensing unit  105  has been described, the details thereof will be omitted. 
     The control unit  170  determines, based on the sensed distance, whether an obstacle is present between the image projection apparatus  100  and the image projection area (S 201 ). If the control unit  170  determines that the obstacle is absent, the control unit  170  projects an image to the image projection area (S 203 ). 
     According to an embodiment, the control unit  170  may determine the state of the environment between the image projection apparatus  100  and the image projection area, based on the sensed distance. For example, the control unit  170  may determine a certain object to be present between the door  410  and the image projection apparatus  100  if the sensed distance is less than the first distance which is a distance to the door  410  to which the image is projected. Accordingly, the control unit  170  may determine, depending on the position of the determined object, a portion or the entire portion of an image to be projected to the determined object without arriving at the door  410  to which a portion or the entire portion of the image s to be projected. Accordingly, the control unit  170  may determine the portion or the entire portion of the image not to arrive at the door  410  which serves as the image projection area. 
     For example, the control unit  170  may determine a certain object to be present between the door  410  and the image projection apparatus  100  if the sensed distance is less than the first distance which is a distance to the door  410  to which the image is projected. 
     If the control unit  170  determines that the obstacle is absent between the image projection apparatus  100  and the image projection area, the control unit  170  may project an image to the image projection area by the image projection unit  180 . 
     For example, the control unit  170  may project an area to the door  410  serving as the image projection area through the image projection unit  180 . Accordingly, an image screen  500 , on which the image projected from the image projection unit  180  is displayed, may be displayed on a door  410  of the case  400 . 
     Meanwhile the control unit  170  determines, based on the sensed distance, whether there is present an obstacle between the image projection apparatus  100  and the image projection area (S 201 ). If the control unit  170  determines the obstacle to be present, the control unit  170  represents an alarm to notify that the obstacle is recognized (S 213 ). 
     The control unit  170  may determine whether the obstacle is present in the whole space or a partial space between the image projection apparatus  100  and the image projection area through the distance sensor  106  included in the sensing unit  105 . 
     The details thereof will be described with reference to  FIG. 11 . 
       FIG. 11  is a conceptual view illustrating obstacle recognition according to an embodiment of the present invention. 
     Referring to  FIG. 11 , the distance sensor  106  may sense the distance to the image projection area through a plurality of sensors, and may sense an obstacle  600  between the door  410 , which is the image projection area, and the image projection apparatus  100 . In addition, if a sensed value by one distance sensor  106   a  among a plurality of distance sensors  106  is different from sensed values by remaining distance sensors  106   a ,  106   b ,  106   c , and  106   d , the control unit  170  may determine the obstacle  600  to be present between the door  410  and the image projection apparatus  100 . 
     If the control unit  170  determines to be present between the image projection area and the image projection apparatus  100 , the control unit  170  may represent an alarm to notify that the obstacle is present on the projected image screen  500 . In addition, the control unit  170  may output an alarm to notify that the obstacle is present through the audio output unit  185 . 
     The control unit  170  of the image projection apparatus  100  avoids the recognized obstacle to project the image to the image projection area (S 215 ). 
     According to an embodiment, the control unit  170  may avoid the recognized obstacle and may project the image to the partial area of the image projection area. In addition, the control unit  170  may avoid the recognized obstacle and may adjust the size of the image projected to the image projection area. 
     The details thereof will be described with reference to  FIG. 12 . 
       FIG. 12  is a view illustrating image projection for avoiding an obstacle according to an embodiment of the present invention. 
     Referring to  FIG. 12 , the control unit  170  may reduce the size of the projected image to project the entire image to the door  410 , which is the image projection area, without projecting the image to the recognized obstacle  600 . Accordingly, the control unit  170  may reduce the size of the image projected to the door  410  through the image projection unit  180 . 
     According to another embodiment, the control unit  170  may avoid the recognized obstacle and may project the image to another area instead of the area to which the image is projected. 
     The details thereof will be described with reference to  FIG. 13 . 
       FIG. 13  is a view illustrating image projection to an adjacent door according to an embodiment of the present invention. 
     Referring to  FIG. 13 , the control unit  170  may project the image to an adjacent door  420 , which is another area, instead of the door  410  to which the entire image or the partial image fails to be projected due to the recognized obstacle  600 . In detail, the control unit  170  may adjust an image projection angle of the image projection unit  180  and may project the image to the adjacent door  420  through the image projection unit  180  having the adjusted angle. Accordingly, the image screen  500 , on which the image projected from the image projection unit  180  is displayed, may be displayed on the adjacent door  420 . 
     Description will be made again with reference to  FIG. 9 . 
     The control unit  170  determines whether a user input to the image screen  500 , on which the image projection area is displayed, is recognized, based on the sensed distance (S 205 ). If the user input is recognized, the control unit  170  performs an operation corresponding to the recognized user input (S 207 ). 
     For example, the control unit  170  may determine the state of a user input to the image projection area, to which the image is projected, based on the variation of a sensing value corresponding to the sensed distance. In detail, the control unit  170  may recognize a user input to an area in which the variation of the sensed value corresponding to the sensed distance is equal to or more than a reference value. 
     The details thereof will be described with reference to  FIGS. 14 and 15 . 
       FIG. 14  is a view illustrating sensing to a user input according to an embodiment of the present invention. 
     Referring to  FIG. 14 , the distance sensors  106   a ,  106   b ,  106   c , and  106   c  included in the distance sensor  106  may sense mutually different areas of the door  410  serving as an area in which the image is projected. In addition, the control unit  170  may recognize, based on the variation of the sensed values by the distance sensors  106   a ,  106   b ,  106   c , and  106   d , user inputs to a first area  411 , a second area  412 , a third area  413 , a fourth area  414 , and a fifth area  415  included in the door  410 . In detail, the control unit  170  may recognize the user inputs to the first area  411  corresponding to the first distance sensor  106   a , the second area  412  corresponding to the first distance sensor  106   a  and the second distance sensor  106   b , the third area  413  corresponding to the second distance sensor  106   b  and the third distance sensor  106   c , the fourth area  414  corresponding to the third distance sensor  106   c  and the fourth distance sensor  106   d , and the fifth area  415  corresponding to the fourth distance sensor  106   d . In this case, the user input may include the user inputs of touching to the first area  411 , the second area  412 , the third area  413 , the fourth area  414 , and the fifth area  415  included in the door  410 , and a user input in the proximity to the door  410  within a predetermined distance from the door  410 . 
     In addition, the control unit  170  may display a function user interface (UI) which shows the functions corresponding to the first to firth areas  411 ,  412 ,  413 ,  414 , and  415 , which are a plurality of areas of the image projection area, on the image screen  500 . In addition, the control unit  170  may recognize a user input to the function UI and may perform a function corresponding to the function UI based on the recognized user input. The details thereof will be described with reference to  FIG. 15 . 
       FIG. 15  is a view illustrating a UI display screen according to an embodiment of the present invention. 
     Referring to  FIG. 15 , the control unit  170  may display function UIs, which correspond to the areas for recognizing the user inputs, on an image projected to the door  410  serving as the image projection area through the image projection unit  180 . For example, the control unit  170  may display the first UI  510  corresponding to the first area  411 , the second UI  520  corresponding to the second area  412 , the third UI  530  corresponding to the third area  413 , the fourth UI  540  corresponding to the fourth area, and the fifth UI  550  corresponding to the fifth area  415 , on the image screen  500  projected to the door  410  by the image projection unit  180 . In this case, the first UI  510  may correspond to “channel-up”, and the second UI  520  may correspond to “channel-down”. The third UI  530  may correspond to “volume-up” and the fourth UP  540  may correspond to “volume-down”. The fifth UI  550  may correspond to “power-off”. If the control unit  170  recognizes the user inputs corresponding to the first to fifth UIs  510 ,  520 ,  530 ,  540 , and  550 , the control unit  170  may perform the operation corresponding to the recognized user input. 
     Meanwhile, the details of the above function UIs and the function operations are provided for the illustrated purpose, and various functions may be implemented according to the settings of the user or a designer. 
     Description will be made again with reference to  FIG. 9 . 
     The control unit  170  determines, based on the sensed distance, the door open state of the door serving as the image projection area to which the image is projected (S 209 ). The control unit  170  adjusts an image projected by the image projection unit  180  if the control unit  410  determines the door  410  to be open (S 211 ). 
     According to an embodiment, the control unit  170  may determine the state of the door  410  of the case  400  which serves as the image projection area based on the sensed distance. For example, the control unit  170  may determine the door  410  to be open if the sensed distance is equal to or more than a first distance which is a distance to the door  410  to which the image is projected. Accordingly, the control unit  170  may determine the open state of the door  410 . 
     The details thereof will be described with reference to  FIG. 16 . 
       FIG. 16  is a view illustrating door open recognition according to an embodiment of the present invention. 
     Referring to  FIG. 16 , the distance sensor  106  may sense a distance related to a direction corresponding to the area to which the image is projected. If the door  410  to which the image is projected is open, the distance sensor  106  may sense that the value of the sensed distance is increased. Accordingly, the control unit  170  may recognize the open of the door  410  based on the sensed distance. 
     If the control unit  170  recognizes that the door  410 , to which the image is projected, is open, the control unit  170  may reduce the brightness of the image projected by the image projection unit  180 . 
     If the control unit  170  recognizes that the door  410 , to which the image is projected, is open, the control unit  170  may stop the image projection unit  180  performing the image projection. 
     In addition, if the control unit  170  recognizes that the door  410 , to which the image is projected, is open, the control unit  170  may project the image to another area. 
     The details thereof will be described with reference to  FIG. 17 . 
       FIG. 17  is a view illustrating image projection to an adjacent door according to another embodiment of the present invention. 
     Referring to  FIG. 17 , if the control unit  170  recognizes that the door  410  is open, the control unit  170  may control the image projection unit  180  to project an image to a adjacent door  420  serving as another area. In detail, the control unit  170  may adjust an image projection angle of the image projection unit  180  and may project the image to the adjacent door  420  through the image projection unit  180  having the adjusted angle. Accordingly, the image screen  500 , on which the image projected from the image projection unit  180  is displayed, may be displayed on the adjacent door  420 . 
     Meanwhile, the control unit  170  may acquire on the movement of the area, to which the image is projected, from a magnet type sensor or a switch type sensor, may adjust the brightness of the projected image based on the acquire information, and may stop the image projection operation. In addition, the control unit  170  may project the projected area to another area based on the acquired information. 
     As described above, according to the present invention, the image projection apparatus  100  may project the image to another area if the door  410 , to which the image is projected, is open. 
     Meanwhile, the description of the image adjusting according to the open of the door is provided for the illustrative purpose. According to the settings of the user or the designer, an image projected in various manners or to various areas may be adjusted. 
     According to the present invention, the image projection apparatus  100  may project an image to various distances, and may display image screens in various sizes according to the distances to the point to which the image is projected. 
     For example, the image projection apparatus  100  may project an image to a distance farther than the distance to the door  410  of the case  400 . Accordingly, the image projection apparatus  100  may display an image screen larger than that of the image screen  500  which has been projected to the door  410 . 
     The details thereof will be described with reference to  FIGS. 18 to 20   
       FIG. 18  is a conceptual view illustrating image projection according to another embodiment of the present invention. 
     Referring to  FIG. 18 , the image projection apparatus  100  may project an image to a wall surface  700  farther than the door  410  of the case  400 . According to an embodiment, if the control unit  170  recognizes that the door  410  is open, the control unit  170  may control the image projection operation of the image projection unit  180  such that the image is projected to the wall surface  700  at a farther place. In detail, the distance sensor  106  may sense the distance to the wall surface  700 . The control unit  170  may adjust at least one of the focus, the resolution, the size, the brightness, the color, and the lightness of the image projected by the image projection unit  180 . The image projection unit  180  may project an image to the wall surface  700  based on at least one of the focus, the resolution, the size, the brightness, the color, and the lightness which are adjusted. Accordingly, the image projection apparatus  100  may project the optimal image to the wall surface  700  farther than the door  410 . 
     Meanwhile, the door  410  may include a plurality of panels. For example, the door  410  may include a screen panel  412  and a transmissive panel  415 . The screen panel  412  and the transmissive panel  415  of the door  410  may be separated from the door  410  in a sliding manner or a detaching manner. Accordingly, as the screen panel  412  or the transmissive panel  415  of the door  410  slides or is detached or attached, the area for the image projected by the image projection apparatus  100  may be adjusted. 
     The details thereof will be described in detail with reference to  FIGS. 19 and 20 . 
       FIG. 19  is a view illustrating image projection to a door according to an embodiment of the present invention. 
     Referring to  FIG. 19 , the door  410  may include the screen panel  412  and the transmissive panel  415 . Accordingly, the image projected by the image projection apparatus  100  may be projected to the door  410  instead of passing through the door  410 . Accordingly, the image screen  500 , on which the image projected from the image projection unit  180  is displayed, may be displayed on the door  410 . 
       FIG. 20  is a view illustrating image projection to a wall surface according to an embodiment of the present invention. 
     Referring to  FIG. 20 , the screen panel  412  may be separated from the door  410 , and the transmissive panel  415  may be included in the door  410 . Accordingly, the image projected by the image projection apparatus may pass through the door  410 . Accordingly, the image screen  500 , on which the image projected by the image projection unit  180  is displayed, may be displayed on the wall surface  700 . 
     Meanwhile, the door  410  may have the structure, the transparency of which may be electrically adjusted. For example, the door  410  may include a material representing electrochromism. Accordingly, a user may electrically adjust the transparency of the door  410 . Accordingly, the image projection apparatus  100  may project the image to the door  410  or the wall surface  700  as the transparency of the door  410  is adjusted. 
     Meanwhile, according to the present invention, the control unit  170  of the image projection apparatus  100  may control the audio output device  300 . For example, the control unit  170  of the image projection apparatus  100  may control the audio output device  300  to output audio corresponding to the projected image. In addition, the control unit  170  of the image projection apparatus may control a lighting operation of a lighting unit  350  included in the audio output device  300 . 
     The details thereof will be described in detail with reference to  FIGS. 21 and 22 . 
       FIG. 21  is a view illustrating an actual configuration of an audio output device according to an embodiment of the present invention. 
     Referring to  FIG. 21 , the audio output device  300  may include a manipulation unit  310 , which acquires a user input, and a speaker unit  330  which outputs audio. 
     The control unit  170  of the image projection apparatus  100  may output the audio corresponding to the projected image through the speaker unit  330  of the audio output device  300 . 
     The audio output device  330  may acquire a user input to the manipulation unit  310  and may deliver the acquire user input to the image projection apparatus  100 . The control unit  170  of the image projection apparatus  100  of the image projection apparatus may perform an operation corresponding to the delivered user input. 
     Meanwhile, the audio output device  330  may be provided at one surface or one lateral surface of the case  400  having the image projection apparatus  100 . 
     In addition, the audio output device  300  may further include a lighting unit  350  which emits light. 
     The lighting unit  350  may emit light in a specific direction. For example, the lighting unit  350  may emit light downward from the case  400  having the audio output device  300 . The details thereof will be described with reference to  FIG. 22 . 
       FIG. 22  is a view illustrating the audio output device  300  according to an embodiment of the present invention. 
     Referring to  FIG. 22 , the audio output device  300  may be provided at a lower end of the case  400 . In the audio output device  300 , the lighting unit  350  may emit light according to the user input to the manipulation unit  310  or under the control of the control unit  170  of the image projection apparatus  100 . 
     According to an embodiment, in the case that the case  400  is a closet installed in a kitchen room, the audio output device  300  may be provided at a lower end or one lateral surface of the closet. The lighting unit  350  included in the audio output device  300  may emit light downward of the closet. Accordingly, the lighting unit  350  may serve as a typical lighting device or a desk lamp. 
     Meanwhile, the lighting unit  350  may emit light in at least one color and may emit light at various light emitting pattern. 
     The lighting unit  350  may emit light in an alarming situation. 
     In this case, the alarming situation may refer to at least one of a schedule set by a user, a disastrous situation, an alarm acquired from an interworking terminal (not illustrated), and an alarm acquired from an interworking home network. 
     According to an embodiment, the control unit  170  of the image projection apparatus  100  may control the lighting unit  350  of the audio output device  300  in case of disaster, such as fire or earthquake. In this case, the control unit  170  may control the lighting unit  350  to emit light in various colors or at various light emission patterns. 
     According to another embodiment, the control unit  170  may acquire alarm information from the interworking terminal (not illustrated) and may control the lighting unit  350  of the audio output device  300  to emit light corresponding to the acquired alarm information. For example, the control unit  170  may receive a call from the interworking terminal (not illustrated), acquire the alarm information on the reception of the message, and control the lighting unit  350  of the audio output device  300  to perform a light emission operation of receiving the call or the message. Meanwhile, the above terminal may include various terminals such as a personal terminal, a home terminal, and an office terminal. 
     According to another embodiment, the control unit  170  may acquire alarm information from the interworking home network and may control the lighting unit  350  of the audio output device  300  to emit light corresponding to the acquired alarm information. For example, the control unit  170  may acquire notification information of a visitor from the interworking home network and may control the lighting unit  350  of the audio output device  300  to perform a lighting operation of notifying that there is present the visitor. 
     In addition, the control unit  170  may control the lighting unit  350  to emit light corresponding to various alarms. For example, the control unit  170  may control the lighting unit  350  to emit light if motion is detected in an area in which the image projection apparatus  100  is provided or another area. 
     Therefore, according to the present invention, the image projection apparatus  100  and the audio output device  300  may provide the alarm information through the lighting unit  350  under various environments. 
     As described above, the lighting unit  350  of the audio output device  300  may notify a user of alarm information on various alarm situations through the light emitting operation. Accordingly, even if it is difficulty for the user to recognize the alarm information due to noise, the user may recognize the alarm information through the light emitting operation of the lighting unit  350 . In addition, the user may easily recognize the alarm for the terminal in a remote place. 
     Meanwhile, the above description of the operation of the audio output device  300  is provided for the illustrative purpose, but the present invention is not limited thereto. Therefore, various operations may be set depending on the selection of the user or the designer. 
     Hereinafter, a user input of the image projection apparatus  100  according to another embodiment of the present invention will be described. 
     First, still another embodiment of the image projection of the image projection apparatus  100  will be described. 
       FIG. 23  is a conceptual view illustrating image projection according to an embodiment of the present invention 
     Referring to  FIG. 23 , the image projection unit  180  may project the image to the projection point as the beam emitted from the light emitting unit  181  passes through the lens unit  182 , and is reflected from the reflection unit  183 . Accordingly, the image screen  400 , on which the image projected by the image projection unit  180  is displayed, may be displayed on one surface to which the image is projected. 
       FIG. 24  is a conceptual view illustrating image projection according to an embodiment of the present invention. 
     Referring to  FIG. 24 , the image projection unit  180  may project the image to the projection point as the beam emitted from the light emitting unit  181  passes through the lens unit  182 . Accordingly, the image screen  400 , on which the projected image projected from the image projection unit  180  is displayed, may be displayed on one surface to which the image is projected. 
     As described above, the image projection unit  180  may project the image in various projection directions by using the reflection unit  183 . 
       FIG. 25  is a flowchart illustrating an operating method of the image projection apparatus according to an embodiment of the present invention. 
     Referring to  FIG. 25 , the sensing unit  106  of the image projection apparatus senses a distance to a sensing area corresponding to the image projection area, to which the image is projected, (S 210 ). 
     The distance sensor  106  may sense the distance to the sensing area corresponding to the image projection area, to which the image is projected, in a direction opposite to the distance sensor  106 . 
     The details thereof will be described with reference to  FIG. 26 . 
       FIG. 26  is a view illustrating distance sensing to a sensing area according to an embodiment of the present invention. 
     Referring to  FIG. 26 , the image projection apparatus  100  may project an image to one surface in the proximity of the image projection apparatus  100 . Accordingly, an area to which the image is projected is referred to as an image projection area  500 . The distance sensor  106  of the image projection apparatus  100  may sense the distance to a sensing area  700  corresponding to the image projection area  500  to which the image is projected. In this case, the sensing area  700  may be an area in the proximity of the image projection area  500  or may be an area close to the image projection area  500 . The state that the image projection apparatus  100  senses the distance may be a state that the image is projected to the image projection area  500  or may be a state that the image is not projected on the image projection area  500 . Meanwhile, the sensing area  700  may include a plurality of sensing areas which are divided into each other. For example, as illustrated in  FIG. 26 , the sensing area  700  may include an upper sensing area  710  and a lower sensing area  730 . 
     The details of the sensing areas will be described in detail with reference to  FIGS. 27 to 29 . 
     One embodiment of the sensing areas will be described with reference to  FIG. 8 . 
       FIG. 27  is a view illustrating a plurality of sensing areas according to an embodiment of the present invention. 
     Referring to  FIG. 27 , the distance sensor  106  of the image projection apparatus  100  may sense distances to a first sensing area  711  and a second sensing area  731  corresponding to the image projection area  500  to which the image is projected. In this case, the first sensing area  711  may be an area at less than a first distance d 1  downward from the upper end of the image projection area  500 , and the second sensing area  731  may be an area at less than a second distance d 2  upward from the lower end of the image projection area  500 . Accordingly, the control unit  170  may recognize, based on a distance value sensed by the distance sensor  106 , whether a specific object is positioned at the first sensing area  711  or the second sensing area  731 . 
     Another embodiment of the sensing areas will be described with reference to  FIG. 28 . 
       FIG. 28  is a view illustrating a plurality of sensing areas according to another embodiment of the present invention. 
     Referring to  FIG. 28 , the image projection apparatus  100  may include the first distance sensor  106   a  and the second distance sensor  106   b  which are a plurality of distance sensors  106 . Each of the first distance sensor  106   a  and the second distance sensor  106   b  may sense the distance to a sensing area corresponding to the image projection area  500 . The first distance sensor  106   a  may sense distances to a third sensing area  713 , which is an area at less than the first distance d 1  downward from the upper end of the image projection apparatus  500 , and a fourth sensing area  733  which is an area at less than the second distance d 2  upward from the lower end of the image projection apparatus  500 , at one area in the left of the image projection apparatus  500 . The second distance sensor  106   b  may sense distances to a fifth sensing area  714 , which is an area at less than the first distance d 1  downward from the upper end of the image projection apparatus  500 , and a sixth sensing area  734  which is an area at less than the second distance d 2  upward from the lower end of the image projection apparatus  500 , at one area in the right of the image projection apparatus  500 . Accordingly, the control unit  170  may recognize, based on a distance value sensed by each of the first distance sensor  106   a  and the second distance sensor  106   b , whether a specific object is located in at least one of the third sensing area  713 , the fourth sensing area  733 , the fifth sensing area  714 , and the sixth sensing area  733 . 
     Another embodiment of the sensing areas will be described with reference to  FIG. 29 . 
       FIG. 29  is a view illustrating a plurality of sensing areas according to still another embodiment of the present invention. 
     Referring to  FIG. 29 , the image projection apparatus  100  may include the first distance sensor  106   a  and the second distance sensor  106   b  which are a plurality of distance sensors  106 . Each of the first distance sensor  106   a  and the second distance sensor  106   b  may sense the distance to a sensing area corresponding to the image projection area  500 . The first distance sensor  106   a  may sense distances to a seventh sensing area  715 , which is an area at less than the third distance d 3  downward from the upper end of the image projection apparatus  500 , and an eighth sensing area  725  which is an area at less than the fourth distance d 5  toward of the lower end of the image projection apparatus  500  from the lower end of the seventh sensing area  715 , and a ninth sensing area  735  at less than the fifth distance d 5  upward from the lower end of the image projection apparatus  500 , at one area in the left of the image projection apparatus  500 . The second distance sensor  106   b  may sense distances to a tenth sensing area  717 , which is an area at less than the third distance d 3  downward from the upper end of the image projection apparatus  500 , and an eleventh sensing area  727  which is an area at less than the fourth distance d 5  toward of the lower end of the image projection apparatus  500  from the lower end of the tenth sensing area  717 , and a twelfth sensing area  737  at less than the fifth distance d 5  upward from the lower end of the image projection apparatus  500 , at one area in the right of the image projection apparatus  500 . Accordingly, the control unit  170  may recognize, based on a distance value sensed by each of the first distance sensor  106   a  and the second distance sensor  106   b , whether a specific object is located in at least one of the seventh sensing area  715 , the eight sensing area  725 , the ninth sensing area  735 , the tenth sensing area  717 , the eleventh sensing area  727 , and the twelfth sensing area  737 . 
     The above description of the distance sensor and the sensing area is provided for the illustrative purpose, but the present invention is not limited thereto. Accordingly, the arrangement of the distance sensors and the number of the distance sensors may be varied depending on the selection of the user or the designer. In addition, the sensing areas may be set with various distances and in various directions depending on the selection of the user or the designer. 
     Description will be made again with reference to  FIG. 25 . 
     Referring to  FIG. 25 , the control unit  170  of the image projection apparatus  100  recognizes, based on the sensed distance, a trigger operation for displaying at least one menu (S 230 ). 
     The control unit  170  may acquire the sensed distance to the sensing area  700  by at least one distance sensor  106  and may recognize, based on the acquired distance, a trigger operation for displaying at least one menu. 
     According to an embodiment, the trigger operation for displaying a menu may be a user input of swiping in one direction from the sensing area  700  corresponding to the image projection apparatus  500 . 
     The details thereof will be described with reference to  FIGS. 30 to 31   
       FIG. 30  is a view illustrating a trigger operation in an up-down direction according to an embodiment of the present invention. 
     Referring to  FIG. 30 , the distance sensor  106  of the image projection apparatus  100  may sense distances to a first sensing area  711  and a second sensing area  731  corresponding to the image projection area  500  to which the image is projected. In this case, the first sensing area  711  may be an area at less than the first distance d 1  downward from the upper end of the image projection area  500 , and the second sensing area  731  may be an area at less than the second distance d 2  upward from the lower end of the image projection area  500 . The control unit  170  may recognize, based on the distance sensed by the distance sensor  106 , a swipe operation in which the hand of a user moves from the first area  711  to the second area  731 . In addition, the control unit  170  may recognize the recognized swipe operation as the trigger operation for displaying the menu. 
     Meanwhile, the control unit  170  of the image projection apparatus  100  may recognize an operation of swiping in an up-down direction within the same sensing area as the trigger operation. 
     In addition, the trigger operation for displaying the menu may be an operation of swiping upward, or an operation of swiping downward. 
       FIG. 31  is a view illustrating a trigger operation in a left-right direction according to an embodiment of the present invention. 
     Referring to  FIG. 31 , the image projection apparatus  100  may include the first distance sensor  106   a  and the second distance sensor  106   b  which are a plurality of distance sensors  106 . Each of the first distance sensor  106   a  and the second distance sensor  106   b  may sense the distance to a sensing area corresponding to the image projection area  500 . The first distance sensor  106   a  may sense distances to a third sensing area  713 , which is an area at less than the first distance d 1  downward from the upper end of the image projection apparatus  500 , and a fourth sensing area  733  which is an area at less than the second distance d 2  upward from the lower end of the image projection apparatus  500 , at one area in the left of the image projection apparatus  500 . The second distance sensor  106   b  may sense distances to a fifth sensing area  714 , which is an area at less than the first distance d 1  downward from the upper end of the image projection apparatus  500 , and a sixth sensing area  734  which is an area at less than the second distance d 2  upward from the lower end of the image projection apparatus  500 , at one area in the right of the image projection apparatus  500 . Accordingly, the control unit  170  may recognize, based on a distance sensed by at least one of the first distance sensor  106   a  and the second distance sensor  106   b , a swipe operation in which the hand of a user moves from a sensing area corresponding to the first distance sensor  106   a  to a sensing area corresponding to the second distance sensor  106   b . For example, the control unit  170  may recognize, based on distances sensed by the first distance sensor  106   a  and the second distance sensor  106   b , a swipe operation in which the hand of a user moves from a sixth sensing area  733  to an eighth sensing area  734 . In addition, the control unit  170  may recognize the recognized swipe operation as the trigger operation for displaying the menu. 
     In addition, the trigger operation for displaying the menu may be an operation of swiping rightward, or an operation of swiping leftward. 
     Meanwhile, the control unit  170  of the image projection apparatus  100  may recognize a tap operation, in which the hand of a user moves in the up-down direction with respect to the image projection area  500 , as the trigger operation for displaying the menu. 
     For example, the control unit  170  may recognize the tap operation, in which the hand of the user moves in the up-down direction with respect to the image projection apparatus  500 , based on the variation of the distance value sensed by the distance sensor  106 , which is made by the tap operation in which the hand of the user moves in the up-down direction with respect to the image projection apparatus  500 . In addition, the control unit  170  may recognize the recognized tap operation as the trigger operation for displaying the menu. 
     The above description of the trigger operation is provided for the illustrative purpose, but the present invention is not limited thereto. Therefore, various operations may be recognized as the trigger operation for displaying the menu, depending on the selection of the user or the designer. 
     Description will be made again with reference to  FIG. 25 . 
     Referring to  FIG. 25 , the control unit  170  of the image projection apparatus  100  displays a menu for at least one operation on the image projection area  500  (S 250 ). The control unit  170  senses the distance for a user input corresponding to the displayed menu (S 270 ) and performs the operation corresponding to the sensed distance (S 290 ). 
     The control unit  170  may control the image projection unit  180  to project the image to the image projection area  500 . In addition, the control unit  170  may control, based on the recognized trigger operation, the image projection unit  180  to display a menu related to at least one operation of the image projection apparatus  100  on the image projection area  500 . Accordingly, the image projection unit  180  may display the menu related to at least one operation on an image projected on the image projection area  500 . The distance sensor  106  may sense the distance to an object according to a user input corresponding to at least one menu displayed on the image projection area  500 . In this case, the object may be the hand of the user. In addition, the control unit  170  may perform the operation corresponding to the displayed menu and the sensed distance. For example, the control unit may perform an operation corresponding to the selected menu, corresponding to one menu in which the sensed distance is displayed. 
     The details thereof will be described with reference to  FIGS. 32 to 34   
     First, the case that one distance sensor  106  is provided will be described with reference to  FIGS. 32 to 34 . 
       FIG. 32  is a view illustrating the displaying of an operation selection menu according to an embodiment of the present invention. 
       FIG. 33  is a view illustrating the displaying of a channel menu according to an embodiment of the present invention. 
       FIG. 34  is a view illustrating the displaying of a volume menu according to an embodiment of the present invention. 
     Referring to  FIG. 32 , the control unit  170  may display a channel menu  561  and a volume menu  571  on one area of the image projection area  500 , corresponding to the recognized trigger operation. In this case, the channel menu  561  may be a menu for displaying a channel change menu, and the volume menu  571  may be a menu for displaying a volume change menu. In addition, the control unit  170  may display the channel menu  561  on a position corresponding to the first sensing area  711  of the image projection area  500  and may display the volume menu  571  on a position corresponding to the second sensing area  731  of the image projection area  500 . Accordingly, the control unit  170  may recognize that the user selects the channel menu  561  if recognizing a user input to the first sensing area  711 , based on the distance sensed by the distance sensor  106 . Accordingly, the control unit  170  may recognize that the user selects the volume menu  571  if recognizing a user input to the second sensing area  731 , based on the distance sensed by the distance sensor  106 . 
     Meanwhile, the control unit  170  may display the channel change menu on the image projection area  500  in the case that the user selects the channel menu  561 . Referring to  FIG. 33 , the control unit  170  may display a channel up menu  562  and a channel down menu  572  on one area of the image projection area  500 . The channel up menu  562  and the channel down menu  572  may be menus for changing a channel displayed on the image projection area  500 . In addition, the control unit  170  may display the channel up menu  562  on a position corresponding to the first sensing area  711  of the image projection area  500  and may display the channel down menu  563  on a position corresponding to the second sensing area  731  of the image projection area  500 . Accordingly, the control unit  170  may recognize that the user selects the channel up menu  562  if recognizing a user input to the first sensing area  711 , based on the distance sensed by the distance sensor  106 . Therefore, the control unit  170  may change the channel displayed on the image projection area  500  to a next channel. Accordingly, the control unit  170  may recognize that the user selects the channel down menu  572  if recognizing a user input to the second sensing area  731 , based on the distance sensed by the distance sensor  106 . Therefore, the control unit  170  may change the channel displayed on the image projection area  500  to a previous channel. 
     Meanwhile, the control unit  170  may display the volume change menu on the image projection area  500  in the case that the user selects the volume menu  571 . Referring to  FIG. 34 , the control unit  170  may display a volume up menu  563  and a volume down menu  573  on one area of the image projection area  500 . In this case, the volume up menu  563  may be a menu for increasing the volume of audio output from the audio output unit  185 , and the volume down menu  573  may be a menu for decreasing the volume of the audio output from the audio output unit  185 . In addition, the control unit  170  may display the volume up menu  563  on a position corresponding to the first sensing area  711  of the image projection area  500  and may display the volume down menu  573  on a position corresponding to the second sensing area  731  of the image projection area  500 . Accordingly, the control unit  170  may recognize that the user selects the volume up menu  563  if recognizing a user input to the first sensing area  711 , based on the distance sensed by the distance sensor  106 . Therefore, the control unit  170  may increase the volume of the audio output from the audio output unit  185 . Accordingly, the control unit  170  may recognize that the user selects the volume down menu  573  if recognizing a user input to the second sensing area  731 , based on the distance sensed by the distance sensor  106 . Therefore, the control unit  170  may decrease the volume of the audio output from the audio output unit  185 . 
     The case that a plurality of distance sensors  106   a  and  106   b  are provided will be described with reference  FIG. 35 . 
       FIG. 35  is a view illustrating the displaying of an operation selection menu according to another embodiment of the present invention. 
     Referring to  FIG. 35 , the control unit  170  may display the channel up menu  562  and the channel down menu  563  on one area of the image projection area  500  corresponding to the first distance sensor  106   a , in response to the recognized trigger operation. In addition, the control unit  170  may display the channel up menu  562  on a position corresponding to the third sensing area  713  of the image projection area  500  and may display the channel down menu  563  on a position corresponding to the fourth sensing area  733  of the image projection area  500 . Accordingly, the control unit  170  may recognize that the user selects the channel menu  562  if recognizing a user input to the third sensing area  713 , based on the distance sensed by the distance sensor  106 . Therefore, the control unit  170  may change the channel displayed on the image projection area  500  to a next channel. Accordingly, the control unit  170  may recognize that the user selects the channel down menu  563  if recognizing a user input to the fourth sensing area  733 , based on the distance sensed by the distance sensor  106 . Therefore, the control unit  170  may change the channel displayed on the image projection area  500  to a previous channel Referring to  FIG. 35 , the control unit  180  may display the volume up menu  572  and the volume down menu  573  on one area of the image projection area  500  corresponding to the second distance sensor  106   b , in response to the recognized trigger operation. In addition, the control unit  170  may display the volume up menu  572  on a position corresponding to the fifth sensing area  714  of the image projection area  500  and may display the volume down menu  573  on a position corresponding to the sixth sensing area  734  of the image projection area  500 . Accordingly, the control unit  170  may recognize that the user selects the volume up menu  572  if recognizing a user input to the fifth sensing area  714 , based on the distance sensed by the distance sensor  106 . Therefore, the control unit  170  may increase the volume of the audio output from the audio output unit  185 . Accordingly, the control unit  170  may recognize that the user selects the volume down menu  573  if recognizing a user input to the second sensing area  734 , based on the distance sensed by the distance sensor  106 . Therefore, the control unit  170  may decrease the volume of the audio output from the audio output unit  185 . 
     Another embodiment of the case that a plurality of distance sensors  106   a  and  106   b  will be described with reference to  FIG. 36 . 
       FIG. 36  is a view illustrating the displaying of an operation selection menu according to another embodiment of the present invention. 
     Referring to  FIG. 36 , the control unit  170  may display the channel up menu  562 , a channel list menu  564 , and the channel down menu  563  on one area of the image projection area  500  corresponding to the first distance sensor  106   a , in response to the recognized trigger operation. In this case, the channel list menu  564  may be a menu for displaying at least one channel. In addition, the control unit  170  may display the channel up menu  562  on a position corresponding to the seventh sensing area  715  of the image projection area  500 , may display the channel list menu  564  on a position corresponding to the eighth sensing area  725 , and may display the channel down menu  563  on a position corresponding to the ninth sensing area  735 . Accordingly, the control unit  170  may recognize that the user selects the channel up menu  562  if recognizing a user input to the seventh sensing area  715 , based on the distance sensed by the first distance sensor  106   a . Therefore, the control unit  170  may change the channel displayed on the image projection area  500  to a next channel. Accordingly, the control unit  170  may recognize that the user selects the channel list menu  564  if recognizing a user input to the eighth sensing area  725 , based on the distance sensed by the first distance sensor  106   a . Therefore, the control unit  170  may display a channel list on the image projection area through the image projection unit  180 . Accordingly, the control unit  170  may recognize that the user selects the channel down menu  563  if recognizing a user input to the ninth sensing area  735 , based on the distance sensed by the first distance sensor  106   a . Therefore, the control unit  170  may change the channel displayed on the image projection area  500  to a previous channel. 
     The control unit  180  may display the volume up menu  572 , a mute menu  574 , and the volume down menu  573  on one area of the image projection area  500  corresponding to the second distance sensor  106   b , in response to the recognized trigger operation. In this case, the mute menu  574  may be a menu for stopping the output of audio from the audio output unit  185 . In addition, the control unit  170  may display the volume up menu  572  on a position corresponding to the tenth sensing area  717  of the image projection area  500 , may display the mute menu  574  on a position corresponding to the eleventh sensing area  727  of the image projection area  500 , and may display the volume down menu  573  on a position corresponding to the twelfth sensing area  737  of the image projection area  500 . Accordingly, the control unit  170  may recognize, based on the distance sensed by the second distance sensor  106   b , that the user selects the volume up menu  572  if recognizing a user input to the tenth sensing area  717 . Therefore, the control unit  170  may increase the volume of the audio output from the audio output unit  185 . Accordingly, the control unit  170  may recognize, based on the distance sensed by the second distance sensor  106   b , that the user selects the mute menu  574  if recognizing a user input to the eleventh sensing area  727 . Accordingly, the control unit  170  may stop the output of the audio. Accordingly, the control unit  170  may recognize that the user selects the mute menu  573  if recognizing a user input to the eleventh sensing area  737 , based on the distance sensed by the second distance sensor  106   b . Therefore, the control unit  170  may decrease the volume of the audio output from the audio output unit  185 . 
     Meanwhile, the above description of the operation performed corresponding to the sensed distance is provided for the illustrative purpose, but the present invention is not limited thereto. Accordingly, various menus may be displayed depending on the selection of the user or the designer, and various operations corresponding to various menus may be performed by the image projection apparatus  100 . 
     According to an embodiment of the present invention, the above method may be implemented in the form of a computer-readable code in a media having a program. For example, the computer-readable recording medium may be a read-only memory (ROM), a random-access memory (RAM), a compact disk read-only memory (CD-ROM), a magnetic tape, a floppy disk, an optical data storage device, and the like. Also, the recording medium may be implemented in the form of carrier waves, (e.g., transmission over the Internet). 
     Accordingly, the above-described image projection apparatus should not be limitedly interpreted, but be considered only for the illustrative purpose It is intended that the present disclosure covers all such modifications provided they come within the scope of the appended claims and their equivalents.