Abstract:
A screen saving method of an image apparatus is provided. The screen saving method includes playing back an audio signal, and displaying a screen saving image that includes audio playback data, according to the played back audio signal. The image apparatus includes a media playback unit, a display unit, and a control unit. The media playback unit plays back the audio signal. The display unit displays the audio playback data. The control unit controls the displaying of the screen saving image, and varies the position of the screen saving image over time.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an image apparatus, and more particularly, to a method of preventing damage to a screen caused by overheating during prolonged music playback and to an image apparatus using said method. 
     2. Description of the Related Art 
     The trend for modern image apparatuses is for high integration and multi-function capability that can play back recorded material, photographs, music, etc. This trend is particularly applicable to digital TVs and set top boxes coupled to personal video recorders (PVR) and digital TVs and set top boxes with memory card slots. 
     Digital TVs and set top boxes with built-in memory slots or equipment with digital versatile disc (DVD) trays allow users to play back music on MP3 files or audio compact discs (CDs). 
     However, in order to listen to music and play back a list of songs, the visual data that is shown on a display is limited to the title of a song, its playback time, etc. 
     That is, during music playback, an image apparatus displays a fixed amount of data on a still screen. When music is played back with a continuously unchanging screen on a CRT, PDP, or LCD device, the image apparatus overheats after an extended period of time elapses. With prolonged music playback, the degree of overheating becomes severe. When such an overheated image apparatus is employed to display a television program or DVD movie after the playing back of music, an afterimage on the overheated device may remain. 
     Generally, when playing back music on an image apparatus, a user first inserts a CD, memory card, or other medium (on which the music is stored) into the image apparatus. The image apparatus in which the music has been inserted then displays a list of music for playback. This list includes song titles, track numbers, etc., from which the user selects desired songs for playback. Here, the image apparatus remains for the most part in an unaltered state for the duration of music playback, with only the playback times and song information changing. 
     When music is played back on an image apparatus over a prolonged period without changing the entire layout of the displayed screen, the fluorescent material in the CRT, PDP, or LCD device connected to the video apparatus can be damaged, so that the damaged portion can no longer emit light. Alternately, after the list of songs on the screen is turned off for another application (such as viewing television), a ghost image of the song list can remain on the display. 
     To save a screen, a user may turn it off during music playback. In this case, however, not only is a user unable to obtain information on the songs being played back, but also the screen cannot be visually appreciated. 
     SUMMARY OF THE INVENTION 
     Accordingly, the present invention is directed to a screen saving method and an image apparatus using the same that substantially obviates one or more problems due to limitations and disadvantages of the related art. 
     An object of the present invention is to provide a screen saving method capable of preventing a screen from being damaged during extended playback of music while displaying information on the current song being played back to a user, and an image apparatus using said method. 
     Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. 
     To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, there is provided a screen saving method of an image apparatus, including: playing back an audio signal; and displaying a screen saving image including audio playback data, according to playing back of the audio signal. 
     In another aspect of the present invention, there is provided a screen saving method of an image apparatus, including: playing back an audio signal; and varying a position of and displaying an image including audio playback data over time, according to the playing back of the audio signal. 
     In a further aspect of the present invention, there is provided an image apparatus including: a media playback unit for playing back an audio signal; a display unit for displaying an image including audio playback data that allows a user to select an audio signal for playback; and a control unit for controlling a varying of a position of and the displaying of the image over time according to the audio signal played back by the media playback unit. 
     It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings: 
         FIG. 1  is a schematic block diagram showing the components of an image apparatus employing a screen saving method according to the present invention; 
         FIG. 2  is a diagram showing a screen saver mode displayed on a screen of the image apparatus in  FIG. 1 ; 
         FIG. 3  is a flowchart showing a screen saving method of an image apparatus according to the present invention; and 
         FIG. 4  is a flowchart showing the screen saving method in  FIG. 3  under different circumstances. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. 
       FIG. 1  is a schematic block diagram showing the components of an image apparatus employing a screen saving method according to the present invention. Referring to  FIG. 1 , the image apparatus includes a user interface  300  for enabling a user to input commands using command keys, a media playback unit  100  for playing back music or video media specified by the user through the user interface  300 , a timer  200  for activating the screen saver when the media playback unit  100  operates, a speaker  500  for outputting the music played back through the media playback unit  100 , a display  600  for operating in a screen saver mode during the media playback, and a screen saver  700  for allowing the display  600  to operate in the screen saver mode, a storage unit  800  with a main memory and a hard disk drive (HDD) for storing data, and a receiver  900  for receiving and processing outside broadcast data. 
     The image apparatus having the above construction accesses a list of songs according to a user&#39;s command when a user inserts a medium (CD, memory card, etc.) containing desired music in the media playback unit  100 . 
     Then, the user selects the music from the list. When the selected music is played back, the control unit  400  activates the timer  200 . The timer  200  determines when to activate the screen saver  700 , and is reset by the control unit  400  when the user presses the control buttons during music playback. When a preset time for the timer  200  to activate the screen saver  700  elapses, the song list displayed by the display  600  is erased and the screen saver mode is activated. 
     When the screen saver mode is activated and appears on the display  600 , the control unit  400  resets and reactivates the timer  200 . Here, the timer  200  checks the time in order to renew the screen saving screen. 
     Subsequently, when a preset time elapses, the timer  200  renews the screen saver. If the user presses a control key, the screen saver is terminated, and the list of songs is re-displayed. If the music from the list continues to be played back, the timer is activated again in order to check the time for activating the screen saver  700 . 
       FIG. 2  is a diagram showing a screen saver mode of the display  600 , provided by the screen saver  700  of the image apparatus of  FIG. 1 . 
     First, as shown in  FIG. 2 , the data displayed in the screen saver mode includes a device for playing back the music (i.e., an HDD, memory card, CD/DVD), the total playback time of the song being played and its current time played back, the playback mode (i.e., a sequential playback, a random playback, a loop track, and a loop entire list), the sound mode (i.e., stereo, left mono, right mono), the total number of songs, the number of the current song of the total number of songs (i.e., 12/120), and the title of the current song. 
     An example of using the screen saver is to black out the entire screen to protect the entire screen, as in  FIG. 2 . Because the music continues to be played back, the current time of playback continues to change during the screen saving mode. 
     During the operation of the screen saver, the timer re-activates the screen saving mode when a preset time elapses. 
     Methods of re-activating the screen saver mode includes a method of randomly changing the position of an image on the screen and a method of creating a soft, imaginary line on-screen and moving the image along that line. That is, an image for the screen saver mode can be a still image unmoving or a moving image for a predetermined reset duration, both of which can be displayed in various ways according to the genre of music being played back. 
     Also, during operation of the screen saver, when a song ends, necessary information such as the playback time, the current number of the song being played, and other data is all renewed simultaneously. 
       FIG. 3  is a flowchart showing a screen saving method of an image apparatus according to the present invention. 
     After a user inserts a medium (CD, memory card, etc.) which contains music desired for playback into the media playback unit  150  of the image apparatus, the image apparatus in which the medium has been inserted displays a list of music for playing back in an operation S 110 . The user then selects music for playback in an operation S 120 . 
     Here, the timer is activated for T 1  in an operation S 130  while the selected music is played back. Here, that music has been played back means that a still image is displayed on the display  600 , and the timer begins to measure a predetermined duration from the start of music playback, which is the initializing point at which the still image is displayed. During this measuring of the predetermined duration, it is determined whether there is a user&#39;s manipulation (operation S 140 ). Such user&#39;s manipulation can include stopping the currently played song to begin another song, or restarting the playback of the current song being played. If there is the user&#39;s manipulation as a result of the determination, the timer is reset for T 1 . If there is no user&#39;s manipulation and the activated duration of the timer is greater than a predetermined time t 1  that is preset for activating the screen saver, the control unit  400  commands the screen saver  700  to operate in a screen saver mode on the display  600 . That is, the screen saver  700  is activated (operations S 150 -S 160 ). 
     During the activation of the screen saver  700 , the timer is re-activated for a predetermined time T 2 . T 2  is for measuring the time for renewing an image displayed on the display in screen saver mode. Moreover, after activation of the timer for T 2 , it is determined whether there is a user&#39;s manipulation (operation S 180 ). If there is the user&#39;s manipulation of selecting a new setting during the currently played music as a result of the determination, the operation S 130  is performed again, where the timer is activated for the predetermined duration T 1 . If there is no user&#39;s manipulation, it is determined whether the playback data contained in the medium has changed (operation S 190 ). A change in the playback data includes a case in which the currently playing song is continuously transformed to another song, a change in playback time, etc. 
     If the playback data contained in the medium has changed as a result of the determination (operation S 190 ), the playback data (playback time, song title, etc.) is changed on the screen (operation S 220 ), and the timer is reset to be activated for the time T 2 . 
     If the playback data contained the medium has not changed as a result of the determination (operation S 190 ), it is determined whether the activated time T 2  of the timer exceeds a predetermined time that is preset for renewing the position of the screen saver (operation S 200 ). 
     If the activated time T 2  of the timer does not exceed the predetermined time preset for renewing the position of the screen saver as a result of the determination (operation S 200 ), the operation S 190  is repeated. 
     On the other hand, if the activated time T 2  of the timer exceeds the predetermined time preset for renewing the position of the screen saver as a result of the determination (operation S 200 ), an image displayed in the screen saver mode is renewed on the display (operation S 210 ), and the timer is reset at the same time to be activated for the time T 2  (operation S 170 ). 
     Through the above processes, the screen saving method according to the present invention can be realized in detail. 
     Although  FIG. 4  shows the substantially same method as that of  FIG. 3 ,  FIG. 3  shows an exemplary screen saving method with a still image displayed during the playback of music, and  FIG. 4  shows an example of operating when a general still image is displayed. The principle of the screen saving methods in the two diagrams is the same. 
     Descriptions have been for a method and apparatus according to preferred embodiments of the present invention; however, these descriptions are for illustrative purposes only, so that the present invention is not limited thereto. That is, although the focus of the above embodiments is to prevent damage from being generated to an image apparatus due to displaying of a still screen for a long time during the playback of music, the present invention can be equally applied to a case where a still screen is required for a relatively long duration, as shown in the embodiment depicted in  FIG. 4 . 
     As described above, the present invention relates to a method of preventing damage from being generated to an image apparatus due to overheating caused by an unchanging screen when music is played back for a long time. As image apparatuses are combined and complex, MP3 music playback capability is provided as a basic specification. However, when music is played back for extended periods using an image apparatus with an expensive display, and the display is left unchanged, damage to the displays is inevitable. However, the present invention protects the expensive display mounted in the image apparatus during extended playback of music, while providing a user with information on the music being played back. 
     Furthermore, the present invention can be applied to all types of image apparatuses including PDPs with slots for memory cards, LCD digital TVs, and digital devices for DVD/CD (DVD players and recorders, DVD-VCR combos, HD type set top boxes with built-in DVD players and recorders, and all apparatuses supporting HDRs, MP3s, and WMAs), so that the image apparatus is protected during playback of music and information on the music being played back can be provided to a user. 
     It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.