Display system and method for displaying video signals

0001The present invention relates to a method of displaying a video signal according to the preamble of claim 1, and to a display system according to the preamble of claim 5.

0002<patcit id="pcit0001" dnum="US20050132264A"><text>US 2005/0132264</text></patcit> discloses a home network comprising: <ul id="ul0001" list-style="dash" compact="compact"><li>a cotttroller to control the flow of digital media content from one or more service providers;</li><li>a plurality of rendering devices coupled to the controller to play the digital multimedia content;</li><li>a media renderer to connect one or more of the plurality of rendering devices to the controller. The controller comprises an intelligent transcoding engine. Theintelligent transcoding comprises one or more of transcoding, transcaling, transrating, transformatting, and transcripting. The transcaling comprises changing the resolution of the digital multimedia content. The controller may comprise a personal computer. The one or more rendering devices connected to the controller are incapable of directly connecting to the controller.</li></ul>

0003<patcit id="pcit0002" dnum="US20050091344A"><text>US 2005/0091344</text></patcit> discloses a technique for serving data to a plurality of clients in a client-server environment. A plurality of versions of date are provided in which at least two versions have different overheads associated therewith. In the video clients are assigned to one of a plurality of quality-of-service classes. Requests are satisfied so that a client belonging to a high quality-of-service class is given preferential access to data versions which require higher overheads to serve.

0004Display systems can display video corresponding to video data input from external devices, and include personal computers (PCs), which display video on display means such as monitors.

0005<figref idref="f0001">FIG. 1</figref> is a view showing a related art display system. In <figref idref="f0001">FIG. 1</figref>, a PC is shown as a display system which comprises a host device 10 and a monitor 100 as a display means.

0006The host device 10 displays on the monitor 100 video corresponding to video data input via a network or video data recorded on a detachable recording medium.

0007<figref idref="f0002">FIG. 2</figref> is a flowchart explaining a process for displaying video in the related art display system. In <figref idref="f0002">FIG. 2</figref>, the host device 10 adjusts the resolution of the video data to a preset resolution (S210). The host device 10 then transmits the video data having the adjusted resolution to the monitor 100 (S220).

0008The monitor 100 decodes the video data transmitted from the host device 10 (S230). The monitor 100 determines a mode of the decoded video data, scales the video data according to the determined mode (S240), and then displays the scaled video data (S250).

0009In the display system, for example, a PC, the image quality can vary according to an occupancy level of a central processing unit (CPU). The occupancy level of the CPU refers to the number of tasks currently performed by the CPU, which may be checked by the Windows task manager.

0010Specifically, if the occupancy level of the CPU is high and if the video has a high resolution, the quality of the displayed image may be reduced. In other words, because the amount of video data transmitted to the monitor gradually increases as the resolution of video becomes higher, it is difficult to transmit video data normally when the CPU is performing other tasks.

0011Accordingly, if video with a high resolution is displayed when the occupancy level of the CPU increases due to other tasks, the image quality can be reduced. In the worst circumstances, it is impossible to transmit video data to the monitor, which causes a screen to become inactive. Furthermore, general users are unaware of the cause of such problems, which increases user inconvenience.

0012Exemplary embodiments of the present invention overcome the above disadvantages and other disadvantages not described above. Also, the present invention is not required to overcome the disadvantages described above, and an exemplary embodiment of the present invention may not overcome any of the problems described above. The method of the invention has the features of claim 1.

0013The host may comprise a computer, and the occupancy level of the control means may comprise the number of tasks performed by a central processing unit (CPU) of the computer.

0014The resolution adjustment selection menu may provide one of the outputtable resolution and a preset recommended resolution, and may comprise a field to select resolution adjustment and a field to maintain the current resolution.

0015If a resolution adjustment command is input through the resolution adjustment selection menu, the adjusting may further comprise adjusting the resolution of the video signal to be output to the outputtable resolution.

0016If it is determined that the checked occupancy level of the control means reaches the level at which it is impossible to output video, the adjusting may further comprise transmitting a warning display command to the display means.

0017The method may further comprise providing a setting menu through which a user can set an outputtable resolution according to the occupancy level of the control means. The setting menu may comprise a field to select the outputtable resolution according to the occupancy level of the control means.

0018The display system of the invention has the features of claim 5.

0019The host may comprise a computer, and the occupancy level of the control means may relates to the number of tasks performed by a central processing unit (CPU) of the computer.

0020The resolution adjustment selection menu may provide one of the outputtable resolution and a preset recommended resolution, and may comprise a field to select resolution adjustment and a field to maintain the current resolution.

0021If a resolution adjustment command is input through the resolution adjustment selection menu, the control means may adjust the resolution of the video signal to be output to the outputtable resolution.

0022If it is determined that the checked occupancy level of the control means reaches the level at which it is impossible to output video, the control means may transmit a warning display command to the display means.

0023The display means may comprise a display on which a warning message is displayed; an OSD generator which displays the warning message; and a scaler which controls the OSD generator to display the warning message if the warning display command is input.

0024The scaler may determine whether a synchronizing signal is input in order to display the warning message, and may control the OSD generator in the free-run state if it is determined that the synchronizing signal is not input.

0025The OSD generator may provide a setting menu through which a user can set the outputtable resolution according to the occupancy level of the control means. The setting menu may comprise a field to select the outputtable resolution according to the occupancy level of the control means.

0026The host may communicate with the display means via one of a universal serial bus (USB), a unified display interface (UDI) and a display port.

BRIEF DESCRIPTION OF THE DRAWINGS

0027The above and other aspects of the present invention will be more apparent by describing certain exemplary embodiments of the present invention with reference to the accompanying drawings, in which:

0028<figref idref="f0001">FIG. 1</figref> is a view showing a related art display system;

0029<figref idref="f0002">FIG. 2</figref> is a flowchart explaining a process for displaying video in the related art display system;

0030<figref idref="f0003">FIG. 3</figref> is a block diagram of a display system according to an exemplary embodiment of the present invention;

0031<figref idref="f0004">FIG. 4</figref> is a view showing a setting menu according to an exemplary embodiment of the present invention;

0032<figref idref="f0005">FIG. 5</figref> is a flowchart explaining a process for displaying a video signal in a display system according to an exemplary embodiment of the present invention;

0033<figref idref="f0006">FIG. 6</figref> is a view showing a resolution adjustment selection menu according to an exemplary embodiment of the present invention;

0034<figref idref="f0007">FIG. 7</figref> is a flowchart explaining a process for displaying a warning message in a display system, according to an exemplary embodiment of the present invention;

0035<figref idref="f0008">FIG. 8</figref> is a view showing a warning message according to an exemplary embodiment of the present invention;

0036<figref idref="f0008">FIG. 9</figref> is a flowchart comprehensively explaining a process for displaying a video signal in a display system according to an exemplary embodiment of the present invention; and

0037<figref idref="f0009">FIG. 10</figref> is another flowchart comprehensively explaining a process for displaying a video signal in a display system according to an exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS OF THE INVENTION

0038Certain exemplary embodiments of the present invention will now be described in greater detail with reference to the accompanying drawings.

0039In the following description, same drawing reference numerals are used for the same elements even in different drawings. The matters defined in the description, such as detailed construction and elements, are provided to assist in a comprehensive understanding of the invention. Thus, it is apparent that the exemplary embodiments of the present invention can be carried out without those specifically defined matters. Also, well-known functions or constructions are not described in detail since they would obscure the invention with unnecessary detail.

0040<figref idref="f0003">FIG. 3</figref> is a block diagram showing a configuration in which a personal computer (PC) is used as a display system according to an exemplary embodiment of the present invention.

0041The PC is used as a display system which adjusts a resolution of video to be output to a display means according to an occupancy level of a control means. The PC provides a setting menu through which a user can set an output resolution of video according to the occupancy level of the control means.

0042Referring to <figref idref="f0003">FIG. 3</figref>, the PC comprises a host device 300 and a monitor 350. The host device 300 may communicate with the monitor 350 through one of a universal serial bus (USB), a unified display interface (UDI) and a display port.

0043The UDI provides a universal connection method to connect display apparatuses, such as a PC, a notebook monitor, a high-definition television (HDTV) and a projector. The UDI also provides compatibility with a digital video interface (DVI), which is currently the standard connection method, while providing complete compatibility with a high-definition multimedia interface (HDMI), which is the standard connection for the HDTV. Accordingly, the UDI enables both the monitor and the HDTV to be connected via a single connector.

0044The display port is a standard capable of combining low-voltage differential signaling (LVDS), which is the original internal interface standard, with the DVI, which is the external connection standard. The display port has a bandwidth of up to 10.8Gbps, which is at least twice that of the DVI (up to 4.95Gbps), and supports multi-stream transmission using the micro-packet architecture so that six streams having a resolution of 1080i (that is, three streams with a resolution of 1080p) can be simultaneously transmitted via a single connector.

0045The host device 300 comprises a key input unit 310, a central processing unit (CPU) 320, a signal processor 330, an on-screen-display (OSD) generator 335 and a USB communication unit 340. The key input unit 310 comprises keys for setting the output resolution of video according to the occupancy level of the control means on a setting menu, and keys for selecting whether to adjust the resolution on a resolution adjustment selection menu.

0046The CPU 320 is used as a control means to control the OSD generator 335 to provide the setting menu through which the output resolution of the video can be set according to the occupancy level of the control means, and adjusts the resolution of the video to the output resolution set according to the occupancy level. The occupancy level of the control means corresponds to the number of tasks performed by the CPU 320.

0047The CPU 320 also controls the OSD generator 335 to provide a resolution adjustment selection menu through which a user can select whether to adjust the resolution of the video to be output to a resolution suitable for the occupancy level.

0048Additionally, the CPU 320 outputs a warning display command to the monitor 350 so that a warning message may be displayed when the occupancy level reaches a level at which it is impossible to output video.

0049The signal processor 330 performs predetermined signal processing with respect to the video to be output, converts the processed video into a USB format, and outputs the adjusted video.

0050The OSD generator 335 generates and outputs a setting menu through which an output resolution of video can be set according to the occupancy level of the control means, and a resolution adjustment selection menu through which a user can select whether to adjust the resolution of the video to be output to a resolution suitable for the occupancy level.

0051The USB communication unit 340 provides a USB interface to perform communication with the monitor 350. The USB communication unit 340 outputs to the monitor 350 the warning display command output from the CPU 320, the video in the USB format output from the signal processor 330, and the setting menu and resolution adjustment selection menu output from the OSD generator 335.

0052The monitor 350 is used as a display means, and comprises a USB communication unit 360, a scaler 370, an OSD generator 380 and a display 390.

0053The USB communication unit 360 provides a USB interface to perform communication with the host device 300. The USB communication unit 360 receives the warning display command, the video in the USB format, the setting menu and the resolution adjustment selection menu, which are output from the host device 300.

0054The scaler 370 displays the video and various menus received from the host device 300 through the USB communication unit 360 on the display 390.

0055If the warning display command is input from the host device 300 through the USB communication unit 360, the scaler 370 may control the OSD generator 380 to display the warning message. Additionally, the scaler 370 may check whether a synchronizing signal is input or not in order to display the warning message, and if the synchronizing signal is not input, the scaler 370 may control the OSD generator 380 to display the warning message in the free-run state.

0056The OSD generator 380 generates a warning message stating that it is impossible to display a normal screen due to the high occupancy level of the control means, and displays the generated message on the display 390.

0057Although the host device 300 comprises the key input unit 310, CPU 320, signal processor 330, OSD generator 335 and USB communication unit 340, and the monitor 350 comprises the USB communication unit 360, scaler 370, OSD generator 380 and display 390 in the exemplary embodiment of the present invention, the present invention is not limited to the configuration described above.

0058Accordingly, the exemplary embodiment of the present invention can be implemented with only the control means, namely, the CPU 320, which functions as a master of the host device 300 and the monitor 350, namely, the display means for displaying video. The CPU 320 may check the occupancy level, and if the resolution of the video to be output is greater than the outputtable resolution set according to the checked occupancy level, the CPU 320 may adjust the resolution of the video to be output to the outputtable resolution set according to the checked occupancy level and may then output the adjusted video to the display means.

0059<figref idref="f0004">FIG. 4</figref> is a view showing a setting menu according to an exemplary embodiment of the present invention.

0060A setting menu 400 of <figref idref="f0004">FIG. 4</figref> enables a user to set the outputtable resolution of the video according to the occupancy level of the control means.

0061Specifically, the setting menu 400 includes a CPU occupancy selection item to select an appropriate output resolution according to a range of the CPU occupancy level. In other words, the CPU occupancy level can be set for each outputtable resolution.

0062For example, if the CPU occupancy level is between 80% and 90%, a user may set the output resolution of the video to 640X480, and if the CPU occupancy level is between 60% and 80%, the user may set the output resolution of the video to 1024X768. If the CPU occupancy level is between 0% and 60%, the user may set the output resolution of the video to 1280x1024, and if the CPU occupancy level is over 90%, a warning message may be output. Accordingly, higher resolution video can be output as the CPU occupancy level decreases.

0063In other words, if the CPU occupancy level is between 80% and 90%, the output resolution of the video may be 640X480, and if the CPU occupancy level is between 60% and 80%, the output resolution of the video may be 1024X768. If the CPU occupancy level is between 0% and 60%, the output resolution of the video may be 1280X1024, and if the CPU occupancy level is over 90%, video cannot be output, and so a warning message can be output.

0064As described above, the output resolution of the setting menu 400 may be set to 640X480, 1024X768 and 1280X1024 only when the maximum resolution supportable by the monitor 350 is 1280X1024.

0065The output resolution of the setting menu 400 may vary according to the maximum resolution supportable by the monitor 350. If the output resolution changes, the range of the CPU occupancy level may also be set at a level appropriate for the changed output resolution. The host device 300 is initially connected to the monitor 350 to communicate with the monitor 350 in order to determine the resolution supportable by the monitor 350. Accordingly a user can check the resolution supportable by the monitor 350 using display registration information.

0066<figref idref="f0005">FIG. 5</figref> is a flowchart explaining a process for displaying a video signal in a display system according to an exemplary embodiment of the present invention.

0067In <figref idref="f0005">FIG. 5</figref>, the CPU 320 checks the occupancy level of tasks currently performed by the CPU 320 (S510).

0068The CPU 320 determines whether the checked occupancy level is greater than a predetermined value (S520). Here, the predetermined value means an occupancy level at which it is impossible to output video. For example, the CPU 320 may determine whether or not the occupancy level is 90% or more on the setting menu 400 of <figref idref="f0004">FIG. 4</figref>.

0069If it is determined that the checked occupancy level is less than the predetermined value, the CPU 320 may check the output resolution set according to the checked occupancy level (S530). Information regarding the output resolution set according to the CPU occupancy level through the setting menu 400 may be stored in a memory (not shown), and the CPU 320 may check the output resolution set according to the checked occupancy level using the above information stored in the memory.

0070The CPU 320 also determines whether the resolution of the video to be output is greater than the output resolution set according to the checked occupancy level (S540). In this situation, the output resolution set according to the CPU occupancy level may be a value set by a user through the setting menu 400, or may be a recommended default value preset when the display system is manufactured and unchanged by a user.

0071If it is determined that the resolution of the video to be output is greater than the output resolution set according to the checked occupancy level, the CPU 320 may control the OSD generator 335 to display the resolution adjustment selection menu through which a user can select whether the resolution of the video to be output is adjusted to the output resolution suitable for the checked occupancy level (S550). In other words, the resolution adjustment selection menu enables the user to select whether the resolution of the video to be output is adjusted to the output resolution set according to the checked occupancy level.

0072The CPU 320 determines whether resolution adjustment is selected on the resolution adjustment selection menu (S560). If it is determined that resolution adjustment is selected, that is, if a command to adjust the resolution is input through the key input unit 310 on the resolution adjustment selection menu, the CPU 320 may adjust the resolution of the video to be output to the output resolution set according to the checked occupancy level, and may output the adjusted video to the monitor 350 (S570).

0073If it is determined that the checked occupancy level is greater than the predetermined value in operation S520, the CPU 320 may transmit the warning display command to the monitor 350 (S580).

0074<figref idref="f0006">FIG. 6</figref> is a view showing a resolution adjustment selection menu according to an exemplary embodiment of the present invention.

0075If it is determined that the resolution of the video to be output is greater than the output resolution set based on the current occupancy level of the CPU, a resolution adjustment selection menu 600 of <figref idref="f0006">FIG. 6</figref> may be shown through which a user can select whether the resolution of the video to be output is adjusted to the output resolution suitable for the occupancy level.

0076Specifically, the resolution adjustment selection menu 600 enables a user to decide whether the resolution of the video to be output is adjusted to the output resolution suitable for the current occupancy level of the CPU. For example, if the current occupancy level of the CPU is 80% or more, the output resolution may be set to 640X480 as shown in the setting menu 400 of <figref idref="f0004">FIG. 4</figref>.

0077Accordingly, the resolution adjustment selection menu 600 comprises a message stating "A resolution of 640X480 is suitable for the current CPU occupancy level. Do you wish to adjust the resolution?" The resolution adjustment selection menu 600 further comprises a field to select resolution adjustment and a field to maintain the current resolution.

0078<figref idref="f0007">FIG. 7</figref> is a flowchart explaining a process for displaying a warning message in a display system, according to an exemplary embodiment of the present invention.

0079In <figref idref="f0007">FIG. 7</figref>, the scaler 370 of the monitor 350 determines whether a warning display command is received from the host device 300 (S710).

0080If it is determined that the warning display command is input, the scaler 370 may determine whether a synchronizing signal is input from the host device 300 (S720).

0081If it is determined that the synchronizing signal is not input, the scaler 370 may execute a free-run mode (S730). The free-run mode enables the warning message to be displayed without the input of the synchronizing signal.

0082The scaler 370 controls the OSD generator 380 to display the warning message (S740).

0083<figref idref="f0008">FIG. 8</figref> is a view showing a warning message according to an exemplary embodiment of the present invention.

0084If it is determined that the current occupancy level of the CPU is greater than the set predetermined value, a warning message 800 may be displayed notifying that an abnormal screen may be displayed, as shown in <figref idref="f0008">FIG. 8</figref>.

0085For example, if the current occupancy level of the CPU is 90%, the CPU 320 may cease transmitting normal video to the monitor 350, and the warning display message may be transmitted to the monitor 350 and displayed. Accordingly, the scaler 370 may control the OSD generator 380 to display a warning message stating "Video may not be displayed normally due to the high occupancy level of the CPU".

0086<figref idref="f0008">FIG. 9</figref> is a flowchart comprehensively explaining a process for displaying a video signal in a display system according to an exemplary embodiment of the present invention.

0087In <figref idref="f0008">FIG. 9</figref>, the control means checks the occupancy level for tasks currently performed by the control means (S910).

0088If it is determined that the resolution of the video to be output is greater than the output resolution set according to the checked occupancy level of the control means, the control means may adjust the resolution of the video to be output to the output resolution set according to the checked occupancy level of the control means, and may output the video at the adjusted resolution (S920).

0089<figref idref="f0009">FIG. 10</figref> is another flowchart comprehensively explaining a process for displaying a video signal in a display system according to an exemplary embodiment of the present invention.

0090In <figref idref="f0009">FIG. 10</figref>, a display means receives a video signal having display attributes adjusted adaptively according to the conditions of a control means by a host (S 1100).

0091The display means displays the video signal received from the host according to the display attributes (S1200).

0092As described above, according to the exemplary embodiment of the present invention, the host device checks the current occupancy level of the CPU and determines whether the resolution of the video to be output is at a level suitable for the current occupancy level of the CPU. If it is determined that the resolution of the video to be output is not at a level suitable for the current occupancy level of the CPU, the host device may determine that the image quality may be reduced. Accordingly, the host device may provide a user with the resolution set by the user according to the current occupancy level of the CPU or with the recommended resolution, and may allow the user to adjust the resolution of the video to be output to the resolution set by the user or to the recommended resolution.

0093Additionally, if the current occupancy level of the CPU reaches the level at which it is impossible to output video, the host device may allow the warning message to be displayed, so that the user may know why the video is not being displayed normally.

0094Although the host device may provide a user with video displayed at the resolution set by the user according to the current occupancy level of the CPU or with the recommended resolution, and may enable the user to adjust the resolution of the video to be output to the resolution set by the user or to the recommended resolution, as described above, the exemplary embodiments of the present invention are not limited thereto.

0095The host device may provide a setting menu through which the CPU occupancy level can be selected for each outputtable resolution, may check the current occupancy level of the CPU and may determine whether the resolution of the video to be output is at a level suitable for the current occupancy level of the CPU. If it is determined that the resolution of the video to be output is not at a level suitable for the current occupancy level of the CPU, the host device may automatically adjust the resolution of the video to be output to the resolution set by the user according to the current occupancy level of the CPU or to the recommended resolution and may output the video at the adjusted resolution.

0096As described above, the host device transmits the warning display command to the monitor so that the warning message is displayed when the current occupancy level of the CPU reaches the level at which it is impossible to output video. However, the exemplary embodiments of the present invention are not limited thereto, and accordingly the host device may generate and display the warning message by itself

0097In other words, it is possible to change the display attributes of the video signal according to the control conditions of the host device and then display the video. The control conditions of the host device may comprise not only the CPU occupancy level but also the mode of the video signal. Additionally, the brightness, contrast and sharpness may be changed according to the control conditions, in addition to the resolution of the video signal.

0098According to the exemplary embodiment of the present invention described above, it is possible to always provide a user with video optimized according to the occupancy level of the CPU. Additionally, if a normal screen is not displayed, a warning message may be displayed informing a user of the reason therefor, which increases user convenience.

0099In addition, a user may adaptively adjust the display attributes of a video signal and output the video signal having the adjusted attributes through a video signal providing device, such as a PC, and thus if the user sets the display environment to minimum levels when using a display apparatus, the optimum display state can be maintained.

0100Moreover, a user can easily acquire display setting information of a video signal currently being displayed.

0101The foregoing exemplary embodiments and advantages are merely exemplary and are not to be construed as limiting the present invention. The present teaching can be readily applied to other types of apparatuses. Also, the description of the exemplary embodiments of the present invention is intended to be illustrative, and not to limit the scope of the claims, and many alternatives, modifications, and variations will be apparent to those skilled in the art.