Abstract:
Disclosed is a display apparatus comprising a video processing part that processes a video signal input from an external apparatus, the external apparatus supplying the video signal and a control signal; a video displaying part that displays the video signal processed by the video processing part; a storing part that stores an ID of the display apparatus, the ID being input by a user; and a controller that controls to supply power to the video displaying part after a delay time corresponding to the ID when the control signal is applied to the controller. With this configuration, the display apparatus can operate with its delay time calculated based on an ID of the display apparatus and a delay constant without adding a separate circuit.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims priority from Korean Patent Application No. 10-2006-0051433, filed on Jun. 8, 2006, the disclosure of which is incorporated herein by reference in its entirety. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to a display apparatus and a control method thereof, and more particularly, to a display apparatus which is capable of receiving a control signal and a video signal from the outside, and a control method thereof. 
         [0004]    2. Description of the Related Art 
         [0005]    In a conventional multi-display system using a plurality of display apparatuses, when power is supplied to all the display apparatuses to display videos, a power supply may become overloaded. This may make it difficult for the power supply to supply sufficient power to the display apparatuses, or may event cause problems in the multi-display system. 
         [0006]    As a preventive measure against such problems, the conventional multi-display system utilizes a high-capacity power supply for sufficiently supplying power to the plurality of display apparatuses or reserves a power application time for each display apparatus using a timer. 
         [0007]    When such as a timer is used, it has to be set for all of the display apparatuses to be powered on with a time difference therebetween. In addition, when the display apparatuses are powered off due to power failure or the like, a reserved time for a display apparatus having no Real Time Clock (RTC) circuit is lost. 
         [0008]    However, installing an RTC circuit for all of the display apparatuses to prevent the loss of a reserved time for any of the plurality of display apparatuses leads to an increase in product cost. 
       SUMMARY OF THE INVENTION 
       [0009]    Accordingly, it is an aspect of the present invention to provide a display apparatus which is capable of operating with a delay time through a calculation according to an identification (ID) of the display apparatus without adding a separate circuit, and a control method thereof. 
         [0010]    The foregoing and/or other aspects of the present invention can be achieved by providing a display apparatus comprising: an video processing part that processes a video signal input from an external apparatus, the external apparatus supplying the video signal and a control signal; a video displaying part that displays the video signal processed by the video processing part; a storing part that stores an ID of the display apparatus, wherein the ID is input by a user; and a controller that controls power supply to the video displaying part after a delay time corresponding to the ID, when the control signal is applied to the controller. 
         [0011]    The control signal may comprise a power application signal for applying power to the display apparatus. 
         [0012]    The controller may perform calculation for the ID based on the ID and a predetermined delay constant and sets the delay time based on a result of the calculation. 
         [0013]    When the ID of the display apparatus is not stored in the storing part, the controller may control the video processing part to display the video signal without the delay time. 
         [0014]    When the ID of the display apparatus is not stored in the storing part, the controller may control the video processing part to generate a User Interface (UI) screen to allow the user to set the ID. 
         [0015]    If the ID of the display apparatus is not stored in the storing part, the controller may control the video processing part to generate a selection screen to allow the user to choose whether to set the ID or display the video signal without the delay time. 
         [0016]    Another aspect of the present invention can be also achieved by providing a control method of a display apparatus, comprising: receiving a video signal and a control signal from an external apparatus; and supplying power to a video display part after a delay time corresponding to a pre-stored ID of the display apparatus when the control signal is received in the display apparatus. 
         [0017]    The receiving the control signal may comprise receiving a power application signal for applying power to the display apparatus. 
         [0018]    The delay time may be obtained through calculation for the ID based on the ID and a predetermined delay constant. 
         [0019]    The control method may further comprise: when there is no pre-stored ID for the display apparatus, supplying power to the video displaying part without the delay time. 
         [0020]    The control method may further comprise: when there is no pre-stored ID for the display apparatus, generating a UI (User Interface) picture to allow a user to set the ID. 
         [0021]    The control method may further comprise: when there is no pre-stored ID for the display apparatus, generating a selection screen to allow a user to choose whether to set the ID or display the video signal without the delay time. 
     
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0022]    The above and/or other aspects and advantages of the present invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which: 
           [0023]      FIG. 1  is a view illustrating a multi-display system according to an exemplary embodiment of the present invention; 
           [0024]      FIG. 2  is a control block diagram of a display apparatus according to an exemplary embodiment of the present invention; 
           [0025]      FIG. 3  is a view showing an example of a UI screen for setting a delay time according to an exemplary embodiment of the present invention; 
           [0026]      FIG. 4  is a control flow chart illustrating an operation of an external apparatus according to an exemplary embodiment of the present invention; and 
           [0027]      FIG. 5  is a control flow chart illustrating an operation of a display apparatus according to an exemplary embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
       [0028]    Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. 
         [0029]      FIG. 1  is a view illustrating a multi-display system according to an exemplary embodiment of the present invention. 
         [0030]    As shown in  FIG. 1 , a multi-display system may comprise an external apparatus  200  and a plurality of display apparatuses  10 ,  20 ,  30  and  40  (sometimes, generally indicated by  100 ). 
         [0031]    The external apparatus  200  provides video signals to be displayed on the plurality of display apparatuses  100 . The external apparatus  200  generates a whole image when the plurality of display apparatuses  100  are used as a single screen, and divides a video signal into a plurality of sub video signals to be displayed on the plurality of display apparatuses  10 ,  20 ,  30  and  40 , respectively. 
         [0032]    In this embodiment, the external apparatus  200  may comprise a video display device such as a videotape recorder (VTR), a digital video disc (DVD) player or the like to output a video signal, and a computer to output a power control signal to apply power to the display apparatuses  100  and the video signal. 
         [0033]    The external apparatus  200  assigns unique IDs to the display apparatuses  10 ,  20 ,  30 , and  40 , respectively, to control the plurality of display apparatuses  100 . 
         [0034]    In this exemplary embodiment, the external apparatus  200  may assign the IDs to the display apparatuses  10 ,  20 ,  30 , and  40 , respectively, using a user input part (not shown) such as a remote controller, a keyboard, buttons or the like. Then, the external apparatus  200  may transmit the power control signal and the video signal to the display apparatuses  10 ,  20 ,  30  and  40 . 
         [0035]    For example, the external apparatus  200  may assign an ID “00” to the display apparatus  10 , an ID “01” to the display apparatus  20 , an ID “02” to the display apparatus  30 , and an ID “03” to the display apparatus  40 . 
         [0036]    In this exemplary embodiment, the IDs of the display apparatuses  10 ,  20 ,  30 , and  40  may be assigned as numerals corresponding to a predetermined time or characters corresponding to specified numerals. 
         [0037]    For example, when the IDs of the display apparatuses  10 ,  20 ,  30  and  40  are assigned as alphabets, for example, A, B, C, and D, respectively, A, B, C, and D may correspond to numerals  1 ,  2 ,  3 , and  4 , respectively. 
         [0038]      FIG. 2  is a control block diagram of a display apparatus according to an exemplary embodiment of the present invention. 
         [0039]    Hereinafter, description will be given on the basis of one of the display apparatuses  10 ,  20 ,  30 , and  40  of the multi-display system display apparatus, for example, the display apparatus  10 . 
         [0040]    As shown in  FIG. 2 , the display apparatus  10  is powered on according to a power application signal received from the external apparatus  200  for display of a video signal. The display apparatus  10  may comprise a storing part  11 , a signal processing part  12 , a display  13 , and a controller  14 . 
         [0041]    The storing part  11  stores an ID of the display apparatus  10 . In this embodiment, the storing part  11  may be embodied by a memory such as an Erasable Programmable Read-Only Memory (EPROM) for storing the ID assigned to the display apparatus by the external apparatus  200 . 
         [0042]    Alternatively, the storing part  11  may store an ID assigned to the display apparatus  10  when the display apparatus  10  is manufactured. 
         [0043]    The signal processing part  12  converts the video signal input from the external apparatus  200  into a video signal of a different format that can be processed by the display  13 , which will be described later. In this embodiment, the signal processing part  12  is controlled by the controller  14 , which will be described later, and may comprise a scaler (not shown) that adjusts a size variable and a position variable of a video signal, and a signal converter (not shown) that converts the video signal input from the external apparatus  200  into a video signal that can be processed by the scaler. 
         [0044]    The display  13  displays an image based on a video signal received from the signal processing part  12 . The display  13  comprises a display panel on which the image is displayed, and a panel driver that processes the video signal input from the signal processing part  12 , and displays the image on the display panel. 
         [0045]    In this exemplary embodiment, the display  13  may include various types of displays, which are capable of adjusting size and position of an image, such as a Digital Light Processing (DLP), a Liquid Crystal Display (LCD), a Plasma Display Panel (PDP), and so on. 
         [0046]    Upon receiving the power control signal and the video signal from the external apparatus  200 , the controller  14  controls parts of the display apparatus  10  to perform relevant functions. In this exemplary embodiment, upon receiving the power application signal to apply power to the display apparatus  10  from the external apparatus  200 , the controller  14  turns on the display apparatus  10  and controls the signal processing part  12  to display the received video signal on the display  13 . 
         [0047]    In addition, upon receiving the power application signal from the external apparatus  200 , the controller  14  checks whether or not the ID of the display apparatus  10  is stored in the storing part  11 . 
         [0048]    According to an exemplary embodiment of the present invention, the multi-display system is illustrated as a video wall comprising the plurality of display apparatuses  100  by way of example. In this exemplary embodiment, the external apparatus  200  may assign IDs to the plurality of display apparatuses  100 , respectively, and control the plurality of display apparatuses  100  according to the assigned IDs in order to divide one screen into several sub screens and display the several sub screens or in order to display different screens through the plurality of display apparatuses  100 , respectively. 
         [0049]    The controller  14  checks whether or not the IDs are stored in the storing part  11  and calculates delay times of the display apparatuses  10 ,  20 ,  30  and  40  according to the IDs. In this exemplary embodiment, a program for calculating the delay times is preset in the controller  14 . 
         [0050]    In this exemplary embodiment, a delay time calculation program is as follows: 
         [0000]    
       
         
               
               
             
           
               
                   
                   
               
             
             
               
                   
                 void DelayTime(void) 
               
               
                   
                 { 
               
               
                   
                  BYTE InputID = Getstatus( ); 
               
               
                   
                  static BYTE constant = 10; 
               
               
                   
                  BYTE Delaytime = 0; 
               
               
                   
                  if (InputID == 0) 
               
               
                   
                  { 
               
               
                   
                   return Delaytime://NORMAL POWER ON SEQUENCE 
               
               
                   
                  } 
               
               
                   
                   else 
               
               
                   
                    { 
               
               
                   
                     Delaytime= InputID * constant 
               
               
                   
                      return Delaytime: //DELAY POWER ON SEQUENCE 
               
               
                   
                     } 
               
               
                   
                   
               
             
          
         
       
     
         [0051]    The controller  14  sets the delay times of the display apparatuses  10 ,  20 ,  30 , and  40  according to values calculated by the above program. 
         [0052]    If the controller  14  has no set delay constant, the controller  14  may send the external apparatus  200  a signal to request the external apparatus  200  to transmit a delay constant to the controller  14 . 
         [0053]    As shown in  FIG. 3 , the external apparatus transmits a control signal to the display apparatus  10  to generate a UI screen to allow a user to set a delay constant of the display apparatus  10  in order to calculate a delay time of the display apparatus  10 . 
         [0054]    In this case, the user sets the delay constant through the user input part, such as a remote controller or the like, in order to calculate a desired delay time. Once the delay constant is set, the external apparatus  200  stores the set delay constant in the display apparatus  10 . 
         [0055]    In this exemplary embodiment, the delay constant may be set to be ‘10’. 
         [0056]    With the delay constant of ‘10’, the display apparatuses  10 ,  20 ,  30 , and  40  may have the respective delay times calculated according to the above program as follows: 
         [0057]    Delay time of display apparatus  10 =00*10=0 seconds 
         [0058]    Delay time of display apparatus  20 =01*10=10 seconds 
         [0059]    Delay time of display apparatus  30 =02*10=20 seconds 
         [0060]    Delay time of display apparatus  40 =03*10=30 seconds 
         [0061]    In this manner, upon receiving the power application signal from the external apparatus  200 , the controller  14  calculates the delay times of the display apparatuses  10 ,  20 ,  30 , and  40  based on the IDs stored in the storing part  11  and the set delay constant, turns a power supply  15  on in accordance with the delay times calculated by the controller  14 , and then displays a video signal on the display  13 . 
         [0062]    Specifically, when the external apparatus  200  sends the power application signal to the plurality of display apparatuses  100 , the display apparatuses  10 ,  20 ,  30 , and  40  are powered on with a time difference therebetween, that is, the display apparatus  10  is immediately powered on, the display apparatus  20  is powered on 10 seconds after receiving the power application signal from the external apparatus  200 , the display apparatus  30  is powered on 20 seconds after receiving the power application signal from the external apparatus  200 , and the display apparatus  40  is powered on 30 seconds after receiving the power application signal from the external apparatus  200 . 
         [0063]    If there is no ID stored for a display apparatus in the storing part, the controller  14  may control the signal processing part  12  to display the video signal on the display  13  without any delay time according to a general power application order. 
         [0064]    As an alternative exemplary embodiment, the controller  14  may transmit an ID request signal to set the IDs to the external apparatus  200 . 
         [0065]    Upon receiving the ID request signal from the display apparatus  10 , the external apparatus  200  may display a UI screen, which allows the user to choose whether to generate an ID or display a video signal without any delay time, on the display apparatus  10 . 
         [0066]    In addition, the external apparatus  200  may check whether or not the plurality of display apparatuses  100  has a duplicated ID in order to avoid ID duplication. For example, the external apparatus  200  may determine whether or not an ID of the display apparatus  10 , which is newly input, coincides with any of the IDs of the plurality of display apparatuses  100 , and, if there is a duplicated ID, generate a UI screen or a warning sound to inform the user of such ID duplication. 
         [0067]      FIG. 4  is a control flow chart illustrating an operation of the external apparatus  200  according to an exemplary embodiment of the present invention. 
         [0068]    Referring to  FIG. 4 , a user assigns IDs to the plurality of display apparatuses  100  through the external apparatus  200  at operation SI. The IDs of the display apparatuses  10 ,  20 ,  30 , and  40  may be set to be numerals or characters corresponding to the numerals. 
         [0069]    In addition, preset separate IDs of the display apparatuses  10 ,  20 ,  30 , and  40  may be stored in the display apparatuses  10 ,  20 ,  30 , and  40 . 
         [0070]    The user sets a delay constant to calculate delay times of the display apparatuses  10 ,  20 ,  30 , and  40  so that the display apparatuses  10 ,  20 ,  30 , and  40  can be powered on at different times at operation S 3 . The set delay constant is stored in the display apparatuses  10 ,  20 ,  30 , and  40  at operation S 5 . In this case, the delay constant may be stored in the storing part  11  in which a program for calculating the delay times is stored. 
         [0071]    The external apparatus  200  transmits a power application signal to the plurality of display apparatuses  100  having the respective IDs at operation S 7 . At this time, the power application signal is simultaneously applied to the plurality of display apparatuses  100 . 
         [0072]      FIG. 5  is a control flow chart illustrating an operation of the display apparatus  10  according to an exemplary embodiment of the present invention. 
         [0073]    Hereinafter, description will be given on the basis of one of the display apparatuses  10 ,  20 ,  30 , and  40  of the multi-display system display apparatus, for example, the display apparatus  10 . 
         [0074]    First, upon receiving the power application signal from the external apparatus  200  at operation S 8 , the controller  14  checks whether or not an ID of the display apparatus  10  is stored in the storing part  11  at operation S 9 . 
         [0075]    If it is checked at the operation S 9  that the ID is stored in the storing part  11 , the controller  14  calculates a delay time according to a preset program at operation S 11 . 
         [0076]    If there is no stored delay constant, the controller  14  may send the external apparatus  200  a signal to request the external apparatus  200  to transmit a delay constant to the controller  14 . 
         [0077]    After the delay time calculated at the operation S 11  elapses at operation S 13 , the controller  14  turns on the display apparatus  10  and causes a video signal to be displayed on the display  13  at operation S 15 . 
         [0078]    On the other hand, if it is checked at the operation S 9  that the ID is not stored in the storing part  11 , the controller  14  turns on the display apparatus  10  without any delay time and controls a video signal to be displayed on the display  13  at the operation S 15 . 
         [0079]    As an alternative embodiment, if it is checked at the operation S 9  that the ID is not stored in the storing part  11 , the controller  14  may transmit an ID request signal to the external apparatus  200 . 
         [0080]    Upon receiving the ID request signal from the display apparatus  10 , the external apparatus  200  may transmit a control signal to the display apparatus  10  so that the display apparatus  10  can display a selection screen, which allows the user to choose whether to set an ID or display a video signal without any delay time. 
         [0081]    Although it has been illustrated in this exemplary embodiment that the ID stored in the storing part  11  is a numerical value, the ID may be set to be a character if only the character may correspond to a specified numerical for calculation of a delay time. 
         [0082]    In addition, for re-setting of an ID, the external apparatus  200  may check whether or not the plurality of display apparatuses  100  constituting the video wall has a duplicated ID, and inform the user of ID duplication in order to avoid the ID duplication. 
         [0083]    As apparent from the above description, the present invention provides a display apparatus, which is capable of being powered on with a delay time calculated based on an ID assigned to the display apparatus and a predetermined delay constant, and a control method thereof. 
         [0084]    Although a few embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.