Abstract:
A smart laser phone includes a main body with a mobile communication module, a band connected to the main body, an optical member, on a side surface of the main body to which the band is not connected, for projecting a laser image, a speaker on the same side surface as the optical member but separated by a set distance therefrom, a sensor unit on the surface between the optical member and the speaker, and a microphone on the outer side of the optical member. When the smart laser phone is worn on the wrist, the microphone and the optical member, the sensor unit and the speaker are sequentially equipped on the side surface of the smart laser phone main body oriented toward the palm, and thus, as the phone is used with an enlarged image, using the phone is convenient, and communication can be carried out with clear sound.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS AND CLAIM OF PRIORITY 
     This application claims benefit under 35 U.S.C. 119(e), 120, 121, or 365(c), and is a National Stage entry from International Application No. PCT/KR2015/009810, filed Sep. 18, 2015, which claims priority to the benefit of Korean Patent Application No. 10-2014-0159923 filed in the Korean Intellectual Property Office on Nov. 17, 2014, the entire contents of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     The present invention relates, in general, to a smart phone and, more particularly, to a smart laser phone that may be operated by touching the display of a smart phone, which is projected onto the palm of the hand using a laser and a sensor, using a finger like a smart watch. 
     BACKGROUND ART 
     With the advancement of technology, the development of wearable computers has been accelerated. 
     Here, a wearable computer indicates a computer that may be naturally worn on the human body, as if clothing, a watch, glasses, an accessory or the like were being worn. Smart phones and tablet PCs may be easily used using a finger or a touch pen, but may be inconvenient because they must be carried in the hand, a pocket or a bag. 
     In contrast, a wearable computer is easy to carry compared to a smart phone or a tablet PC because it may be worn on the wrist or be worn like a pair of glasses. 
     Particularly, various smart watch products, through which various services, such as weather, messages, announcements, stock quotations and the like, may be retrieved in a wireless manner, are being released. 
     Meanwhile, a portable terminal is a portable device having one or more of a voice or video call function, a function of inputting and outputting information, a function of storing data, and the like. 
     With the diversification of functions, a portable terminal has a sophisticated function, such as capturing of a picture or video, playback of music or video files, execution of games, reception of broadcast services, or the like, and it is possible to implement a comprehensive multimedia player by installing these functions all together therein. 
     In order to implement a portable terminal having these sophisticated functions, new and various attempts involving hardware or software are being made. For example, a user interface environment through which a user may easily and conveniently search for or select a function is being provided. 
     Further, because a portable terminal is regarded as a personal device, a variety of designs are applied thereto in order to express the owner&#39;s individuality. 
     The structural form of a conventional portable terminal enables the handheld-size device to be carried in the hand or in a pocket. However, while the portable terminal is being carried, damage arising from the loss or fall thereof may occur. 
     In order to prevent such damage, the case in which a user wears the portable terminal like an article of clothing or an accessory has been proposed. In this case, if the portable terminal is worn on the wrist or aim like a normal watch, the portable terminal is required to realize good wireless network performance and good usability while having a small size in order not to adversely affect its appearance. 
     Further, when a smart phone is carried in a bag, it is inconvenient in that the owner is required to take the smart phone out of the bag in order to take or make a call or to use a message function. Also, there may be a problem in that the owner cannot receive a call or a message because he or she does not detect that the smart phone is ringing or vibrating in his/her bag. 
     As conventional technology for solving these problems, there is Korean Patent Application Publication No. 10-2009-46306, titled “Band-type portable terminal”. 
       FIG. 1  is a front perspective view of a conventional band-type portable terminal. 
     Referring to  FIG. 1 , a portable terminal  1  includes a terminal body  10  having a display unit  11  arranged on the outer surface thereof, and the opposite ends of the terminal body  10  are connected with a band  20  formed in order to enable it to be worn on the wrist. 
     The display unit  11  outputs numbers, characters, and still or moving images depending on various modes of the portable terminal  1 . 
     For example, the display unit  11  may be configured to display input numbers when the portable terminal  1  is in a calling mode, to display input text or numbers when the portable terminal is in a message-sending mode, to display a menu in order to enable searching for functions, and to display the current time when the portable terminal is in an idle mode. 
     On one side of the display unit  11 , a manipulation unit  30  for input is arranged. The manipulation unit  30  may include a wheel  31  installed therein, which may rotate in a fixed position in order to quickly move a pointer or a cursor. 
     The wheel  31  may include push-button keys  32  and  33  at the opposite ends thereof, which may perform an input operation when pushed. Further, in order to enable the wheel  31  itself to perform an input operation when pushed, the wheel may include a switch in the lower part thereof. 
     A desired menu item or function may be quickly accessed by rotating the wheel  31  forwards or backwards, the corresponding function may be executed by pushing the wheel  31 , and movement in a direction other than the direction indicated by the wheel  31  may be performed by pushing the push-button keys  32  and  33 . 
     For example, in order to enable the input of characters or numbers, the portable terminal  1  enumerates numbers and alphabet characters in a display unit  11 . 
     The enumerated numbers and alphabet characters are selected and designated by manipulating the wheel  31  or the push-button keys  32  and  33 , whereby a telephone number or text, corresponding to the numbers or alphabet characters, is output through the display unit  11 . 
     On the other side of the display unit  11 , a sound output unit  12  for outputting sound is arranged. The sound output unit  12  may output a system alarm or voice depending on various modes of the portable terminal  1 , or may output audio signals when multimedia data are reproduced. Furthermore, the sound output unit  12  may be used in a speakerphone mode while talking over the phone. 
     The band  20  is connected to the terminal body  10  in the form of a wrist watch. The band  20  may be configured such that outer covers, made of leather, rubber or plastic, are stacked, and antenna radiators  60  and  70  may be included in the interior of the band. 
     A fastener  26  may be placed at the part at which the opposite ends of the band  20  meet in order to be fastened to or unfastened from the wrist. A buckle, a snap-fit hook or the like may be applied to the fastener  26 . 
     Accordingly, the portable terminal  1  may autonomously implement a wireless mobile communication function. That is, the selection of a desired function or input operation may be performed using the manipulation unit  30 , a call may be made or taken through the manipulation, and menu items and functions may be retrieved and executed. 
     However, because this conventional smart watch is worn on the wrist, a display unit installed therein has a small size, and thus it is not easy to operate the smart watch while viewing the actual display. 
     Also, there is a problem in that while talking on the phone, the voice of the opposite side may not be clearly heard, and the phone owner is required to speak loudly. 
     SUMMARY 
     Accordingly, in order to solve the above problems, the present invention is intended to provide a smart laser phone that projects a laser image onto a wall, a desk or the palm of the hand, whereby the phone may be used through an extended display. 
     Also, another object of the present invention is to provide a smart laser phone that is operated in order to enable voice output from the phone to be clearly heard. 
     Also, a further object of the present invention is to provide a smart laser phone that enables a phone call to be made in a call standby state by distinguishing the call standby state from the usual state of the phone. 
     In order to accomplish the above objects, a smart laser phone according to an embodiment of the present invention may be configured to include a laser phone body having a mobile communication module and a display unit, a band connected to the opposite ends of the laser phone body, an optical means, formed on a side of the laser phone body to which the band is not connected, for projecting a laser image, a speaker, formed on the side on which the optical means is formed but spaced apart from the optical means by a predetermined distance, a sensor unit formed on the side between the optical means and the speaker, and a microphone formed on the outer side of the optical means, wherein when the smart laser phone is worn on the wrist, the microphone, the optical means, the sensor unit and the speaker are sequentially arranged on the side of the laser phone body in the direction that faces the palm of the hand. 
     According to the smart laser phone of the present invention, because it is possible to operate a phone using an extended laser image, the input of a key may be performed more easily. 
     Also, according to the smart laser phone of the present invention, because a microphone is located near the mouth and the sound output from a speaker is delivered using the palm of the hand, not only may a clearer voice call be realized, a resonance effect may also be achieved according to the shape of the palm. 
     Also, according to the smart laser phone of the present invention, a call standby state may be distinguished from the usual state of a phone, and a phone call may be made in the call standby state, whereby the phone call may be made without loss of phone conversations. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
         FIG. 1  is a perspective view of a conventional smart watch; 
         FIG. 2  is a perspective view of a smart laser phone according to an embodiment of the present invention; 
         FIG. 3  is a block diagram that shows the main components of a smart laser phone according to an embodiment of the present invention; 
         FIG. 4  is a block diagram that shows the detailed configuration of the image creation means of  FIG. 3 ; 
         FIG. 5  is a block diagram for describing the operation of the deflection means of  FIG. 4 ; 
         FIG. 6  is a reference drawing for describing the operation of a motion detection sensor; and 
         FIGS. 7 and 8  are reference drawings illustrating an example of the use of a smart laser phone of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     Terms and words used in the specification and claims should not be construed as being limited to ordinary meanings or dictionary definitions. Based on the fundamental rules whereby an inventor can appropriately define the meanings of terms in order to describe the invention using the best method, the terms and words used in the specification and claims should be construed consistently with the technical spirit of the invention. 
     Through the specification, when it is said that some part “includes” a specific element, this means that the part may further include other elements, without excluding them, unless otherwise mentioned. The terms “unit”, “part”, “module”, and “device” used herein indicate a unit that executes at least one function or operation, and may be implemented in hardware, software or a combination thereof. 
     While terms such as “first” and “second,” etc., may be used to describe various components, such components must not be understood as being limited to the above terms. The above terms are used only to distinguish one component from another. For example, a first component may be referred to as a second component, and likewise a second component may be referred to as a first component. 
     The term “and/or” should be understood as including all of combinations that can be made from one or more relevant items. For example, the expression “the first item, the second item, and/or the third item” means not only the first, the second, or the third item, but the combination of all of items that can be made from two or more of the first, second, or third items. 
     It will be understood that when an element is referred to as being “connected” to another element, it can be directly connected to the other element or intervening elements may be present. Other words used to describe the relationship between elements, that is, “between” and “directly between”, or “adjacent” and “directly adjacent”, etc. should be similarly interpreted. 
     Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 
       FIG. 2  is the perspective view of a smart laser phone according to an embodiment of the present invention. 
     As illustrated in the drawing, the laser phone  100  of the present invention includes a display unit  120  on the upper part thereof. 
     On the side of the laser phone, a microphone  140 , an optical means  151 , a sensor unit  160  and a speaker  171  are sequentially arranged. Accordingly, when a command image, projected through the optical means  151 , is touched using a finger or a pointer, the corresponding command is recognized, and the laser phone is activated, whereby the laser phone may be used like a common smart phone. 
     To this end, the laser phone  100  includes a laser phone body  110 ; a wrist band  130  connected to the opposite ends of the laser phone body; an optical means  151 , formed on the side of the laser phone body to which the wrist band  130  is not connected, for projecting a laser image; a speaker  171 , formed on the side on which the optical means  151  is formed but spaced apart from the optical means  151  by a predetermined distance; a sensor unit  160 , formed on the side between the optical means  151  and the speaker; and a microphone  140 , formed on the outer side of the optical means  151 . When the smart laser phone of the present invention is worn on the wrist, the microphone  140 , the optical means  151 , the sensor unit  160  and the speaker  171  may be sequentially arranged on the side of the laser phone body in the direction that faces the palm of the hand. 
     First, the optical means  151  is configured to enlarge the deflection region of a projected laser beam so as to have the size of the palm or the back of the hand, in which case the laser beam incident on the optical means  151  is provided from the image creation means  150 . 
     Referring to the detailed block diagram of the image creation means in  FIG. 4 , the image creation means  150  projects an image that is the same as the image to be displayed in the display unit  120  through a laser. 
     To this end, the image creation means includes three lasers  153  for receiving an image to be displayed in the display unit  120  and emitting a laser beam, and a deflection means  154  for deflecting each of the laser beams emitted from the lasers  153  along the lines in the x and y directions. Accordingly, a deflection region formed by the laser beams, emitted from the deflection means  154 , is enlarged by the optical means  151  so as to have the size of the palm, and is then projected. 
     Here, the control apparatus  152  controls the intensity of the laser beam and the deflection means  154  by being electrically connected to the image creation means  150 . Here, the control apparatus receives the image to be displayed in the display unit  120  and controls the intensity of the laser beam in order for the optical means  151  to radiate a laser beam having an intensity that is not injurious to a person on the palm of the hand. 
     That is, the laser  153  is controlled by a signal for adjusting the intensity of the laser beam in order to enable each of the low points of the projected image to have the required brightness on the palm or back of the hand and emits laser beams in a raster scan manner through the deflection means  154 , whereby all points of the image are sequentially projected onto the image plane on the palm. 
     To this end, the deflection means  154  includes a polygonal mirror  154   a  for deflecting laser beams to the line in the direction, the polygonal mirror  154   a  having an outer circumference formed in polygonal surfaces in order to emit the laser beams radiated from the laser  153  in a raster scan manner, and a rotational mirror  154   b  for deflecting the laser beams from the polygonal mirror  154   a  in the y direction. 
     Similar to an existing television configured with a cathode-ray tube, the laser  153  functions as a single electron gun or as multiple electron guns when color display is required, and the polygonal mirror  154   a  and the rotational mirror  154   b  displace the magnetic or electrostatic deflection of a known electron beam. 
     The sensor unit  160  includes a motion detection sensor  161  and a command recognition sensor  162  in order to detect the positional movement of the laser phone and to recognize the input of a touched key. 
     When any one of the patterns projected onto the palm of the hand is touched, the command recognition sensor  162  recognizes the corresponding command and sends the control unit  190  the data that are mapped thereto in order to execute the command, whereby the control unit may determine the input command. 
     To this end, a table, in which each command matches coordinates based on a mode displayed on the palm, is stored in the memory  185 , and when coordinates related to a touched key in a predetermined mode are input from the command recognition sensor  162 , the table is searched for the command corresponding to the coordinates and the command is executed. 
     The command recognition sensor  162  is an apparatus capable of sensing one or more patterns (which are related to key commands) projected onto a palm, but because there may be four or more patterns related to commands, as shown in  FIG. 5 , a sensor capable of sensing X and Y coordinates is used. 
     As such a sensor, an IR LED sensor or a laser scanner may be used, but without limitation thereto, a sensor that may sense a specific pattern, selected using a finger or a pointer from among multiple patterns displayed in a predetermined area, is enough in the present invention. 
     For reference, when an IR LED sensor is used, a preset function is activated when the movement of an object is detected, and the position of a finger that moves for input is detected using the refraction of light. 
     In other words, if an infrared ray output from a sensor reaches an object such as the finger of a user or a pointer, the direction of the infrared ray is changed, and an IC detects the change and sends a signal corresponding thereto to the control unit  190 , whereby the input of a specific key may be recognized. 
     Also, a laser scanner may use a time difference measurement method, a triangulation method, a phase difference measurement method or the like. 
     When a measurement method using a phase difference is employed, an electric signal in which the phase and intensity of the laser are reflected is generated, and a sensor compares the phase and intensity of the emitted signal with those of the reflected signal and calculates the distance using Equation (1): 
     
       
         
           
             
               
                 
                   L 
                   = 
                   
                     
                       ( 
                       
                         
                           1 
                           2 
                         
                         * 
                         θ 
                       
                       ) 
                     
                     / 
                     
                       ( 
                       
                         
                           f 
                           c 
                         
                         * 
                         2 
                         ⁢ 
                         π 
                       
                       ) 
                     
                   
                 
               
               
                 
                   [ 
                   
                     Equation 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     1 
                   
                   ] 
                 
               
             
           
         
       
     
     where L denotes the distance to the object, θ denotes the phase difference, f denotes a laser frequency, and c denotes the speed of light. 
     In the case of the phase difference measurement method, when a sensor is used in an actual environment, the intensity of the laser signal that returns by being reflected from an object is decreased due to external factors such as the distance to the object, the angle with the object, the optical reflectance of the object, and the like. 
     Because it is difficult to calculate the phase difference from the laser signal having the decreased intensity, the process of amplifying the signal may be performed before the signal is interpreted, but the error in the measurement may occur during this process. 
     Particularly, because the skin of a palm has a low reflectance, when the coordinates on the palm are measured using a laser scanner, it is necessary to consider the error that occurs in the measured distance depending on the reflectance. 
     The motion detection sensor  161  is configured to detect the movement of a palm, that is, the movement from the position of the palm placed in order to view the image projected from the laser phone to the position of the palm that is put to the ear in order to make a call. 
     Specifically, the motion detection sensor  161  considers the following situation. When the image, emitted from the laser phone worn on the wrist, is displayed on the palm of the hand and a call button on the palm is pushed, it takes time to move the hand to the ear after the call button is pushed. Accordingly, if a call is connected before moving the hand, a caller may not be able to talk on the phone while moving the hand. 
     In order to prevent this problem, when it is determined through the command recognition sensor  162  that a call button key is pushed, the control unit  190  does not immediately connect a call but delays the call connection for a certain time, which may correspond to the time taken to move the hand from the position at which the hand is placed in order to view the image projected onto the palm to the position near the ear to make a phone call, or it may connect a call after detecting the movement of the position of the laser phone. 
     In the present invention, a call is connected when the movement of the phone is detected using the motion detection sensor, whereby a caller may talk on the phone. 
     Accordingly, when the motion detection sensor  161  is operated after the input of a command is sensed using the command recognition sensor  162 , the control unit  190  determines the change in position and activates the microphone  140  and the speaker  171  immediately while starting to connect a call using the mobile communication module  182 . 
     The motion detection sensor  161  may use a sensor capable of merely sensing a position, and an example thereof will be described with reference to the drawing. 
     The example is illustrated in  FIG. 6 . 
       FIG. 6  is a reference drawing for describing the operation of a motion detection sensor, and the motion detection sensor is configured such that a cylindrical transparent housing  161   c , which contains a mover  161   a  therein, is arranged across the light shield area or the sensing area of a transmission photo-sensor  161   b  and  161   d.    
     Here, the shape of the transparent housing is not limited to the cylindrical shape, but has a suitable shape depending on the circumstances. 
     The mover  161   a  inside the transparent housing  161   c  may linearly travel back and forth in the housing  161   c.    
     For example, when the tilting of a position sensor causes a change in the slope or the position, the mover  161   a  linearly moves along the straight path formed in the housing due to gravity, whereby the mover  161   a  momentarily blocks the emission of light from the light emission unit  161   b  to the light reception unit  161   d  of the transmission photo-sensor  161   b  and  161   d.    
     The mover  161   a  is an iron ball or an object similar thereto, and may use any object that may block light while rolling along the path inside the housing  161   c.    
     When the light is blocked, the transmission photo-sensor outputs a sensing signal through an input/output terminal. Accordingly, the sensing signal is processed by the control unit  190 , whereby the movement of the position is recognized. 
     Therefore, using the above-mentioned method, the motion detection sensor may sense the position, or more specifically, the change in the position. 
     Also, two motion detection sensors  161  may be used together in order to respectively sense the position in the horizontal axis and the position in the vertical axis. 
     Generally, the movement of an object may be divided into a horizontal component and a vertical component. 
     Accordingly, when the two sensors are installed so as to be perpendicular to each other, the paths along which the mover  161   a  travels in the housing  161   c  of the motion detection sensor are perpendicular to each other. In this case, if the motion detection sensor moves up and down, the mover of the motion detection sensor moves along the vertical axis, whereby the change in position is detected. 
     Meanwhile, if the motion detection sensor horizontally moves, the mover moves along the horizontal axis, whereby the change in position is detected. 
     That is, when the position of the laser phone changes, it may be divided into horizontal movement and vertical movement, and the horizontal movement and the vertical movement respectively cause the movement of the mover along the horizontal axis and the movement of the mover along the vertical axis, whereby the change of the position is sensed and the sensing signal is generated. 
     To this end, the average value of the output data of the motion detection sensor  161 , related to movement from a usual state, in which the palm is unfolded in order to enable key input, to a call standby state, in which the palm is put to the ear, is acquired through multiple tests and is stored in the memory  185 , whereby the data output from the motion detection sensor  161  are compared with the average value and whether the state is changed to the call standby state may be determined. 
     Although not illustrated, in another embodiment, the time taken to put the phone to the ear after a call button key is pushed in a usual state is averaged, and a call may be connected after the average time. 
     Also, the laser phone body  110  is formed so as to support various components on the frame thereof, in which case other components needed for configuring the smart laser phone of the present invention may be embedded in the body. 
     Referring to the block diagram illustrating the main components of the smart laser phone according to an embodiment of the present invention in  FIG. 3 , a mobile communication module  182 , a sound output unit  170 , an image creation means  150 , a power supply unit  181 , memory  185  and the like may be arranged so as to be electrically connected with each other in the laser phone body  110 . 
     The mobile communication module  182  serves to transmit and receive voice data, text data, image data and control data by transmitting or receiving wireless signals to or from a mobile communication base station through an antenna radiator (ANT) in order to perform functions associated with common mobile communication, and includes a transmission unit (not illustrated) for encoding a signal to be transmitted and transmitting the encoded signal and a reception unit for decoding a received signal. 
     The display unit  120  displays a User Interface (UI) or a Graphic User Interface (GUI) related to making phone calls, and may be used as an input apparatus related to the manipulation of a key, which is input by a user in order to control the operation of the terminal. Also, it may be configured such that a key may be manipulated through a separate manipulation unit  183 . 
     Also, the display unit  120  is arranged inside the transparent window of the phone body, and is configured to include a liquid crystal display (LCD) module, an Organic Light-Emitting Diode (OLED) module, and a touch screen, through which intonation may be visually represented, whereby a user may input information by touching it. 
     The sound output unit  170  is configured to output sound data received from the mobile communication module in a call signal reception and calling mode, a recording mode, a voice recognition mode, or a broadcast service reception mode, or to convert the sound data stored in the memory  185  and output the converted data to the speaker  171 . 
     The external interface  184  functions as an interface between the smart laser phone and all of external devices connected to the phone body, such as a wired or wireless headset, an external charger, a wired or wireless data port, a card socket (for example, a memory card or a SIM/UIM card) and the like. 
     The external interface  184  receives data or power from the external devices and delivers the data or power to the components inside the mobile terminal, or sends the data stored in the mobile terminal to the external devices. 
     Also, the external interface  184  may be connected to a keyboard or a keypad through which data may be input from outside the phone. 
     The external interface  184  may use a cable or a wireless manner, and may be a connection terminal for connecting an earphone or a port for near-field communication (for example, an IrDA port, a Bluetooth port, a wireless LAN port or the like). 
     The memory  185  serves to store a program for operating and controlling a terminal and temporarily store data when any one of a phonebook, a message, a still image and a moving image is input or output. The image creation means  150  operates to create a laser image by receiving an image to be displayed in the display unit  120  and send the laser image to the optical means  151 . The memory includes the concept of a common hard disk, card-type memory (for example, SD or XD memory), flash memory, RAM, ROM, and the like. 
     Depending on the control of the control unit  190 , the power supply unit  181  receives the internal power or external power and supplies power necessary for the operation of each of the components. 
     The power supply unit  181  may be embedded in the phone body  110 , and may store power that is supplied from outside through a power supply port. 
     The control unit  190  performs control and processes related to a voice call, data communication, a video call and the like using the mobile communication module  182 , executes a command in response to the key input by receiving a signal related to the sensed command and detected motion from the sensor unit  160 , and activates a call signal of the mobile communication module  182  so as to enable a user to make a phone call when it is determined that data concerning the operated key are input from the command recognition sensor  162  and that the motion detection sensor  161  operates. 
     Also, the control unit  190  outputs an image that is the same as the image to be displayed in the display unit  120  to the image creation means  150 , whereby the laser image is projected onto the palm. 
     In this case, the input of a command key may be directly manipulated while viewing the display unit  120 , which is configured with a touch screen, or a corresponding key may be manipulated using a finger or a pointer while viewing the image projected onto the palm. 
     Also, if a manipulation unit  183  for performing basic operation of the phone is formed on one side of the phone body  110 , as shown in  FIG. 2 , any one of the manipulation unit  183 , the display unit  120 , and the image projected onto the palm may be selected and manipulated as needed in the state in which the laser phone is being worn. 
     Also, a circuit board in which components for configuring the smart laser phone of the present invention are electrically connected with each other may be included in the phone body. 
     An antenna radiator (not illustrated) for radiating or receiving a wireless signal may be installed in the band  130 . The antenna radiator may be formed so as to have a length and pattern for sending and receiving a signal with a base station or another user while moving. 
     Generally, the control unit  190  controls the overall operation of the mobile terminal. For example, it performs control and processes related to a voice call, data communication, a video call and the like through the wireless mobile communication module  182 . 
     Additionally, the control unit  190  wirelessly communicates with an earset or communicates with home appliances using the near-field communication module  182 . 
     Also, the smart laser phone  100  may include a broadcast service reception module for receiving broadcast signals transmitted through a satellite or terrestrial channel, transforming the broadcast signals to broadcast data capable of being output through the sound output unit  170  and the display unit  120 , and outputting the broadcast data to the control unit  80 . 
     The broadcast service reception module receives supplementary data related to broadcast service (for example, an Electric Program Guide (EPG), a channel list and the like). The broadcast data, transformed by the broadcast service reception module, and the supplementary data may be stored in the memory  185 . 
     A simple example of a method for making a phone call using the above-described smart laser phone is described below. 
     When it is necessary to make a phone call while the smart laser phone of the present invention is being worn on the wrist, if a phone button, displayed on the manipulation unit  183  or the display unit  120 , is pressed, the control unit  190  displays the numeric keypad, through which the phone number may be input, both in the display unit and on the palm of the hand using the image creation means  150  and the optical means  151 , whereby the state in which input of the phone number is waited for is prepared. 
     Referring to the reference drawing that shows an example of the use of the smart laser phone of the present invention in  FIG. 7 , the pattern of the numeric keypad projected from the smart laser phone  100  is displayed on the palm. 
     Then, when the corresponding phone number is sequentially input, the command recognition sensor  162  sequentially interprets the sensed number, and when a call button key (the pattern having the telephone symbol in the drawing) is touched, the control unit  190  does not immediately connect a call through the mobile communication module  182  but determines whether the palm has moved so as to touch the mouth and the ear, as shown in the reference drawing in  FIG. 8 , in order to talk on the phone using the smart laser phone  100  of the present invention by receiving the sensing signal from the motion detection sensor  161 . 
     That is, when it is determined that the state for inputting a phone number is switched to the state for preparing for a phone call, the control unit  190  connects a call using the mobile communication module  182 , and the speaker  171  and the microphone  140  operate in conjunction with the mobile communication module  182 , whereby a phone call is made. 
     Referring to the reference drawing that shows an example of the use of the smart laser phone of the present invention in  FIG. 8 , the microphone  140  is placed near the mouth of a caller, and the voice output from the speaker  171  may be delivered to the ear in such a way that the voice is transmitted along the curved shape of the palm. 
     Therefore, if the smart laser phone of the present invention is worn on the inside of the wrist, that is, on the same side as the palm, the phone may be used more conveniently. 
     Consequently, the sound output from the speaker of the phone is first reflected from the part near the cheek (a), and the reflected sound is reflected again from the part in the palm (b), whereby the sound is delivered to the ear. 
     Referring to  FIG. 8 , it looks similar to the case in which a receiver is held to the ear when receiving a phone call. The appearance may be a little different, but when making a phone call, a caller opens his or her hand, bends the palm of the hand as if scooping water with the hand, places the microphone installed in the phone near the mouth, and puts the bent palm to the ear. 
     It is desirable to put all the fingers together, and if the phone call is made while the middle finger touches the upper part of the ear, the bent palm amplifies the voice of the opposite party using resonance, whereby the voice may be clearly heard. 
     Although not illustrated, in another embodiment, the smart phone of the present invention may be used without the laser projection function for a smart phone wearable on the wrist. 
     That is, if a key is manipulated using the image displayed in the display unit without the laser projection function, when the use of a speaker and/or a microphone is required, the use of the speaker and/or the microphone is not immediately activated but the use of the speaker and/or the microphone is activated only when the motion detection sensor  161  operates. 
     In this case, the present invention is characterized in that, when a specific key related to the motion detection sensor is pressed, the related function is activated depending on whether the motion detection sensor operates. 
     As described above, although the present invention has been described with reference to a specific embodiment, it will be clearly understood by those skilled in the art that various changes and modifications are possible within the scope of the technical spirit of the present invention, and these changes and modification also fall within the scope of the accompanying claims. 
     The present invention relates to a smart laser phone, in which, while the smart laser phone is worn on the wrist, an image is created by projecting a laser beam onto the palm of the hand and the image on the palm may be touched with a finger, whereby the smart laser phone may operate like a common smart watch. Therefore, it may be used in place of a smart phone.