Abstract:
A television based on an operating system, including: a first memory storing a boot loader program, the boot loader program performing a hardware basic test and a booting; a television signal generating portion outputting a television broadcast; a second memory storing a MPEG control program and preset channel information, the MPEG control program driving the television signal processing portion to output a video signal corresponding to a received television broadcast corresponding to the stored preset channel information; and a central processing unit executing the boot loader program, executing the MPEG control program after the hardware basic test of the boot loader program and loading the operating system onto a random access memory after the MPEG control program drives the television signal processing portion to output the video signal corresponding to the received television broadcast corresponding to the stored preset channel information.

Description:
CLAIM OF PRIORITY 
     This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C § 119 from an application entitled Television Based on Operating System and Method of Displaying an Initial Screen Thereof earlier filed in the Korean Industrial Property Office on Aug. 23, 2000, and there duly assigned Ser. No. 2000-48973 by that Office. 
     BACKGROUND OF THE INVENTION 
     1. Field of the invention 
     The present invention relates to a television based on an operating system (OS) and a method of displaying an initial screen. 
     2. Description of Related Art 
     A television based on an operating system, for example, a computer-based television and a set top box, cannot be viewed by a viewer until a booting process is completed. When the power is supplied to the television, the central processing unit (CPU) executes a boot loader program stored in a ROM to perform the booting process. Then, the viewer can view the television broadcast after an application program is executed. The boot loader program is programmed to check a main memory, the ROM, the devices mounted on peripheral component interconnect (PCI) slots, a hard disk, and a floppy disk, and to load the operating system (OS) into the main memory to boot the system. Such a digital television is constructed to be based on the operating system, and thus the user cannot manipulate the television until the loading of the operating system is completed. However, since a time to execute the boot loader program is lengthy, the user could wait for a long time (about 10 to about 30 seconds) without being able to view the television broadcast. 
     An example of a computer-based television is provided by U.S. Pat. No. 6,209,044 to Mark P. Vaughan entitled Method And Apparatus For Controlling A Display Monitor In A PC/TV Convergence System. 
     Hereinafter, a configuration and an initial screen display method of a television based on an operating system being contemplated by the Assignee of the present invention are explained in detail, centering on the computer-based television. 
     FIG. 1 is a block diagram illustrating a configuration of a computer-based television. As shown in FIG. 1, the computer-based television includes a central processing unit (CPU)  10 , a ROM  20 , a random access memory (RAM)  30 , a north and south bridge  40 , a hard disk drive (HDD)  50 , a PCI bridge  60 , and a television card  70 . 
     CPU  10  executes the boot loader program stored in the ROM  20  when power is supplied to the television. RAM  30  loads the operating system and the application programs, which are stored in HDD  50 , by a control of CPU  10 . At this point, since CPU  10  has only a CPU core, CPU  10  requires a bridge that connects it with chips having different interfaces to connect external chips. A chip to connect CPU  10  with ROM  20 , RAM  30 , and a PCI bus is called the “north bridge”. Similarly, a chip to connect a PCI bridge with HDD  50 , a USB (not shown), a UART (not shown), peripheral integrated circuits (ICs: not shown), and the like is called the “south bridge”. The north and south bridge  40  is referred to as a chip that incorporate the north bridge and the south bridge. The PCI bridge  60  serves as an intermediate connection unit to connect various chips with the PCI bus. Even though not shown, a graphic card, a sound card and the like are included. 
     Television card  70  includes a tuner  71 , a channel decoder  72 , a transport stream demultiplexer  73 , a video decoder  74 , an audio decoder  75 , and first and second digital-to-analog converters  76  and  77 . Tuner  71  receives a broadcasting wave of a certain frequency from an antenna (not shown) under a control of CPU  10 . Channel decoder  72  converts the broadcasting wave from tuner  71  into a transport stream. Transport stream demultiplexer  73  converts the transport stream output from channel decoder  72  into an audio packet stream and a video packet stream. Video decoder  74  restores the video packet stream, and audio decoder  75  restores the audio packet stream. Digital-to-analog converter  76  converts a digital video signal output from video decoder  74  into an analog video signal and outputs it to be displayed on a screen (not shown). Digital-to-analog converter  77  converts a digital audio signal output from audio decoder  75  into an analog audio signal and outputs it to a speaker (not shown). 
     FIG. 2 is a flowchart illustrating an initial screen display method of the computer-based television of FIG.  1 . First, CPU  10  checks whether power is supplied on or not. When power is supplied, CPU  10  executes the boot loader program stored in ROM  20  (step  210 ). The boot loader program performs a hardware basic test. For example, it checks ROM  20 , RAM  30 , HDD  50 , and other various devices mounted therein (step  220 ). CPU  10  then loads the operating system, stored in HDD  50 , into RAM  30  (step  230 ). CPU  10  loads the application programs stored in the HDD  50  into RAM  16  (step  240 ). The CPU  10  then performs an application program (step  250 ). CPU  10  then processes an input of a user (step  260 ). In other words, in order to view a television broadcast output through television card  70 , the user waits to execute the application program until after a completion of the booting process. 
     Even though not explained, a set top box according to the related art also is operated in a similar manner to the computer-based television. 
     As described above, since the application programs cannot be executed until after the loader program performs the system booting completely, the television based on the operating system can be viewed only after a completion of the system booting process, whereupon there comes the problem in that the user waits for a long time (about 10 to about 30 seconds) without viewing the television broadcast. 
     For the foregoing reasons, there is a need for a television based on an operating system in which the viewer can view a television broadcast directly after the television is turned on. U.S. Pat. No. 5,838,383 to Hiroyuki Chimoto et al. entitled Multimedia Television Receiver And Method Of Booting The Same teaches that while the CPU is performing bootstrap processing immediately after the power switch of the television receiver is turned on, a DMA device is initialized, causing a monitor to display a television image being received, no matter whether an operating system has been activated or not. While the television image is being displayed the CPU continues to perform the bootstrap processing in order to activate the operating system. 
     SUMMARY OF THE INVENTION 
     To overcome the problems described above, preferred embodiments of the present invention provide a television based on an operating system in which a viewer can view a television broadcast before completion of a system booting process. 
     Another object of the present invention is to provide a method of displaying an initial screen of a television based on an operating system to enable a viewer to view the television broadcast before completion of the system booting process. 
     In order to achieve the above objects, the preferred embodiments of the present invention provide a television based on an operating system, including: a first memory storing a boot loader program, the boot loader program performing a hardware basic test and a booting process; a television signal generating portion outputting a television broadcast; a second memory storing a MPEG (Moving Pictures Expert Group) control program and channel information, the MPEG control program driving the television signal generating portion to output the television broadcast corresponding to the channel information; and a central processing unit executing the boot loader program and executing the MPEG control program after the hardware basic test of the boot loader program. 
     The preferred embodiment of the present invention further provides a method of displaying an initial screen of a television based on an operating system, the television including a boot loader program, a MPEG program, and a channel information, including: executing the boot loader program to perform a hardware basic test; executing the MPEG control program to output a television broadcast of a channel corresponding to the channel information; and completing a booting. 
     The first memory is a read only memory (ROM). The second memory is one of a nonvolatile memory and is one of a flash memory and an EEPROM. The first and second memories may be the same memory, and the first and second memories are one of a flash memory and an EEPROM. The second memory further stores a volume channel. The television signal generating portion is a television card including a tuner, a channel decoder, a demultiplexer, audio and video decoders, and first and second digital-to-analog converters. 
     Using the television based on the operating system according to the preferred embodiment of the present invention an initial screen can be displayed before a system booting is completely performed. Therefore, the viewer can view the television without waiting for a long time. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     A more complete appreciation of the present invention, and many of the attendant advantages thereof, will become readily apparent as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings in which like reference symbols indicate the same or similar components, wherein: 
     FIG. 1 is a block diagram illustrating a configuration of a computer-based television; 
     FIG. 2 is a flow chart illustrating an initial screen display method of the television based on the operating system of FIG. 1; 
     FIG. 3 is a block diagram illustrating a computer-based television according to a preferred embodiment of the present invention; 
     FIG. 4 is a flow chart illustrating an initial screen display method of the computer-based television according to the preferred embodiment of the present invention 
     FIG. 5 is a block diagram illustrating a set top box according to the preferred embodiment of the present invention; and 
     FIG. 6 is a flow chart illustrating an initial screen display method of the set top box according to the preferred embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     Reference will now be made in detail to a preferred embodiment of the present invention, example of which is illustrated in the accompanying drawings. 
     FIG. 3 is a schematic block diagram illustrating a computer-based television according to the preferred embodiment of the present invention. As shown in FIG. 3, the computer-based television according to the preferred embodiment of the present invention includes a central processing unit (CPU)  110 , a read only memory (ROM)  120 , a random access memory (RAM)  130 , a north and south bridge  140 , a hard disk drive (HDD)  150 , a peripheral component interconnect (PCI) bridge  160 , and a television card  170 . 
     CPU  110  executes the boot loader program stored in ROM  120  when the television is turned on. CPU  110  further detects whether data in ROM  12  indicates whether any additional ROM exists or not during a hardware basic test of the boot loader program. When the additional ROM exists, CPU  110  passes a control function over the additional ROM while stopping the booting process. The additional ROM executes a program stored therein to drive television card  170  and the television broadcast is viewed by the user. At this time the program in the additional ROM passes control back to the boot loader program which continues the booting operation. It may be set by the user in advance whether the program in the additional ROM is executed or not before completing the booting operation. 
     During the continued booting process, RAM  130  loads the operating system and the application programs, which are stored in HDD  150 , by a control of the CPU  10 . At this point, since CPU  110  has only a CPU core, CPU  110  requires a bridge that connects it with chips having different interfaces to connect external chips. A chip to connect CPU  110  with ROM  120 , RAM  130 , and a PCI bus is called a “north bridge”. Similarly, a chip to connect a PCI bridge with HDD  50 , a USB, a UART, a peripheral integrated circuit (IC: not shown), and the like is called a “south bridge”. A chip that incorporate the north bridge and the south bridge is referred to as a north and south bridge  140 . A PCI bridge  160  is one which serves as an intermediate connection unit to connect various chips with the PCI bus. Even though not shown, a graphic card, a sound card and the like are included in the system. 
     Television card  170  includes a tuner  171 , a channel decoder  172 , a transport stream demultiplexer  173 , a video decoder  174 , an audio decoder  175 , digital-to-analog converters  176  and  177 , and a nonvolatile memory  178 . Tuner  171  receives a broadcasting wave of a certain frequency from an antenna (not shown, or cable, satellite, VCR, digital disk, or other broadcast media) under a control of CPU  110 . 
     Channel decoder  172  converts the broadcasting wave from tuner  171  into a transport stream. Transport stream demultiplexer  173  converts the transport stream output from channel decoder  172  into an audio packet stream and a video packet stream. Video decoder  174  restores the video packet stream a digital video signal, and audio decoder  175  restores the audio packet stream into a digital audio signal. Digital-to-analog converter  176  converts the digital video signal into an analog video signal and outputs it to be displayed on a screen (not shown). Digital-to-analog converter  177  converts the digital audio signal into an analog audio signal and outputs it to a speaker (not shown). 
     Nonvolatile memory  178  acts as the additional ROM described above. Nonvolatile memory  178  stores channel information and volume information of a television broadcast which the user wants to view when the television is turned on. The channel information and volume information of the television broadcast may be set by the user through the application program. In other words, the user can set, in advance, a channel of the television broadcast and turn up or down a sound volume through the application program. Nonvolatile memory  178  further stores an audio program ID and a video program ID to inform demultiplexer  173  which video and audio programs are used for the television broadcast. The audio and video program IDs may be set, in advance, through the application program. 
     Also, an audio/video present flag is stored in nonvolatile memory  178  so that it is determined in advance whether or not the television broadcast is to be viewed before completion of the booting process. Such informations are not deleted even though the television is turned off. 
     Nonvolatile memory  178  further stores a MPEG control program for driving television card  170  to output the audio and video signals in order to enable the viewer to view a television broadcast before the booting process is completed. In other words, when the television is turned on, the MPEG control program first checks the audio/video present flag. When the audio/video present flag is set such that the television broadcast is to be viewed before the booting process is completed, the MPEG control program sets the channel information and the volume information in tuner  171  and initializes channel decoder  172 , demultiplexer  173 , audio decoder  174  and video decoder  175 . 
     The MPEG control program further sets the audio and video program IDs in demultiplexer  173 . Therefore, television card  170  is driven, and a television broadcast of a channel set in advance can be viewed by the viewer before completion of the booting process. Thereafter, the MPEG control program passes a control function over the boot loader program to complete a booting. 
     An EEPROM, a flash memory or the like may be used as nonvolatile memory  178 . At this point, even though nonvolatile memory  178  is mounted on television card  170 , nonvolatile memory  178  may be incorporated into HDD  150 , or nonvolatile memory  178  may be arranged independent of HDD  150  and television card  170 . 
     FIG. 4 is a flowchart illustrating a method of displaying an initial screen of the computer-based television according to the preferred embodiment of the present invention. First, when the television is turned on, CPU  110  executes the boot loader program (step  410 ). The boot loader program performs a basic hardware test (step  420 ). At the same time, CPU  110  checks whether the additional ROM (i.e., the nonvolatile memory  178 ) exists or not (step  430 ). 
     When the additional ROM exists, CPU  110  checks whether the audio/video present flag is set to execute the MPEG control program or not (step  435 ). When the audio/video present flag is set to execute the MPEG control program, the boot loader program passes a control function over to the MPEG control program (step  440 ). The MPEG control program drives television card  170  to output the television broadcast (step  450 ). That is, the MPEG control program sets in tuner  171  the channel information and the volume information, which are stored in nonvolatile memory  178 , to receive the television broadcast of a channel that is set in advance by the user. The MPEG control program also initializes channel decoder  172 , demultiplexer  173 , audio decoder  174  and video decoder  175 . The MPEG control program further sets the audio and video program IDs in demultiplexer  173 . Therefore, a television broadcast of a channel that is set in advance by a user can be viewed before a completion of the booting process (step  460 ). Thereafter, the MPEG control program passes a control function over the boot loader program to complete the booting process (step  470 ). Following step  470 , or when CPU  110  determines in step  430  that additional ROM (i.e., the nonvolatile memory  178 ) does not exist, or when CPU  110  determines in step  435  that the audio/video present flag is not set to execute the MPEG control program, the process goes to step  480 . 
     Instep  480 , CPU  110  loads the operating system stored in HDD  150  into RAM  130 . Thus the booting process is completely performed. 
     CPU  110  then loads an application program stored in HDD  150  into RAM  130  (step  490 ). Thereafter, CPU  110  performs the application program (step  500 ). Then CPU  110  processes an input of the user (step  510 ). In other words, in order to view the television broadcast output through the television card, the user should execute the corresponding application program after completion of the booting process. 
     FIG. 5 is a block diagram illustrating a set top box according to the preferred embodiment of the present invention. As shown in FIG. 5, the set top box includes a central processing unit (CPU)  210 , a random access memory (RAM)  220 , a north and south bridge  230 , a nonvolatile memory (ROM, EEPROM or flash memory)  240 , a peripheral component interconnect (PCI) bridge  250 , and a television signal generating portion  260 . Note that CPU  210 , RAM  220 , north and south bridge  230 , and PCI bridge  250  can perform the same functions as those in the computer-based television of FIG.  3 . 
     Nonvolatile memory  240  is one which incorporates HDD  150  and nonvolatile memory  178  of FIG.  3  and is divided into four regions. A first region stores the boot loader program. A second region stores the operating system and the application programs. A third region stores the channel information, the volume information, the audio and video program IDs, and the audio/video present flag. A fourth region stores the MPEG control program. That is, the third and fourth regions of nonvolatile memory  240  substitute for a function of nonvolatile memory  178  of the computer-based television. 
     The television signal generating portion  260  includes a tuner  261 , a channel decoder  262 , a transport stream demultiplexer  263 , a video decoder  264 , an audio decoder  265 , and digital-to-analog converters  176  and  177 . Components of television signal generating portion  260  perform the same functions as those of television card  170  of the computer-based television. Television card  170  of FIG. 3 is removably mounted in PCI bridge  160 , but components of television signal generating portion  260  are integrally formed and thus are non-detachable. 
     FIG. 6 is a flowchart illustrating a method of displaying an initial screen of the set top box according to the preferred embodiment of the present invention. First, when the television is turned on, CPU  210  executes the boot loader program (step  610 ). The boot loader program performs a basic hardware test (step  620 ). At the same time, CPU  210  checks whether the additional ROM exists or not (step  630 ). 
     When the additional ROM exists, CPU  210  checks whether the audio/video present flag is set to execute the MPEG control program or not (step  635 ). When the audio/video present flag is set to execute the MPEG control program, the boot loader program passes a control function over to the MPEG control program (step  640 ). The MPEG control program drives television signal generating portion  260  to output the television broadcast (step  650 ). That is, the MPEG control program sets, in tuner  261 , the channel information and the volume information, which are stored in the nonvolatile memory  240 , to receive the television broadcast of a channel that is set in advance by the user. The MPEG control program also initializes channel decoder  262 , demultiplexer  263 , audio decoder  264  and video decoder  265 . The MPEG control program further sets the audio and video program IDs in demultiplexer  263  (step  660 ). Therefore, a television broadcast of a channel that is set in advance by user can be viewed before a completion of a booting. 
     Thereafter, the MPEG control program passes a control function over to the boot loader program to complete the booting process (step  670 ). 
     Following step  670 , or when CPU  210  determines in step  630  that additional ROM does not exist, or when CPU  210  determines in step  635  that the audio/video present flag is not set to execute the MPEG control program, the process goes to step  680 . 
     Subsequently, CPU  210  loads the operating system stored in nonvolatile memory  240  into RAM  220  (step  680 ), thereby completing the booting process. Then, CPU  210  load an application program stored in nonvolatile memory  240  into RAM  220  (step  690 ). 
     As described herein before, using the television based on the operating system according to the preferred embodiment of the present invention an initial screen can be displayed before a system booting is completely performed. Therefore, the viewer can view the television without waiting for a long time. 
     While the invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing and other changes in form and details may be made therein without departing from the spirit and scope of the invention.