Abstract:
Preferred format parameters including timing that is contained in an extended display information data (EDID) EEPROM in a digital video display system can be dynamically established by a user. In this way, when the video display system engages a source of video in a “plug and play” context, instead of communicating to the source what formats are supported and then accepting a format selected by the source, the preferred format is sent from the EEPROM to the source so that the video display system receives video from the source in the user-desired format.

Description:
FIELD OF THE INVENTION  
       [0001]     The present invention relates generally to display systems and more particularly to establishing a preferred display format in an extended video display for requesting the preferred format from a video source.  
       BACKGROUND  
       [0002]     Many modem video display systems can display video in more than one format, e.g. high definition or standard definition, using more than one aspect ratio. When this is the case, the source of video interprets this information and sends the display a particular format, depending on how the source has interpreted the display characteristics. The restriction on present systems is that the decision by the source regarding the format chosen to display the video data is automatic and may not necessarily be the one desired by the user. The user is thereby limited to the choice made by the source itself. This presents a problem when using current technology because, with high definition displays becoming more readily accessible, the user may wish to request that the source send video in a user-selected format instead of one chosen by the source for its own convenience. Furthermore, current processes to display certain data could undesirably include multiple format changes which inevitably introduce some features that impair picture quality of the data on display.  
         [0003]     With more specificity using a non-limiting example, in an enhanced extended display identification database (E-EDID) device, formats that are supported by the device are listed and one of the listed formats can be marked as being the native timing of the display.  
         [0004]     In general, the source device is required to read the contents of the video device over a specified channel. The source then interprets this data. The source then outputs a format, but as discussed above the source is not required to output a particular format. It is only required to output a format that is within the capabilities of the display device, as described in the EDID data. There is no requirement that the source device output the content in the format which matches the user&#39;s preferred timing of the display.  
       SUMMARY OF THE INVENTION  
       [0005]     A method for establishing what format video is received from a source of video includes dynamically establishing at least one parameter that is associated with a user-preferred format in a memory of a video display system. The parameter is sent to the source to cause the source to send video to the display system in the desired format.  
         [0006]     The parameter may be established in an extended display information data (EDID) electrically erasable programmable read-only memory (EEPROM) associated with the video display system. The parameter may be timing, scan lines, or aspect ratio, and can be communicated to the source in a plug-and-play operation.  
         [0007]     In some embodiments the method may include allowing a user to select one parameter from a group of parameters stored in the EEPROM, with the EEPROM being altered as necessary to reflect the user selection. In other embodiments the method may include allowing a user to select one parameter from a group of parameters, with the EEPROM being dynamically altered as necessary to contain only the parameter selected by the user. In this latter embodiment a checksum associated with the EDID in the EEPROM is dynamically established to reflect the parameter selected by the user.  
         [0008]     In another aspect, a video display system includes a processor and a format information storage apparatus. The processor presents to a user a visual display and then permits the user to use the visual display to define a preferred video format. The processor programs the format information storage apparatus such that the format information storage apparatus can indicate to a source of video the preferred video format. Consequently, the source sends video to the display system formatted in the preferred way.  
         [0009]     In yet another aspect, a video display source includes a processor that receives information from a video display system. The information includes a parameter which is established in response to a user selecting a preferred display format. The processor of the video display source causes the source to send video data to the video display system in the preferred display format in response to the parameter.  
         [0010]     The details of the present invention, both as to its structure and operation, can best be understood in reference to the accompanying drawings, in which like reference numerals refer to like parts, and in which: 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0011]      FIG. 1  is block diagram of the present system;  
         [0012]      FIG. 2  is a flow chart of the general logic;  
         [0013]      FIG. 3  is a flow chart of one implementation of the present logic; and  
         [0014]      FIG. 4  is a flow chart of another implementation of the present logic. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0015]     Referring initially to  FIG. 1 , a system is shown, generally designated  10 , that includes a video source  12  and a digital display system  14 , sometimes colloquially referred to as a “sink”. As indicated in  FIG. 1 , the video source  12  communicates video data to the display system  14  for display of the video. Also, the source  12  can access display information at the display system  14  for purposes to be shortly disclosed.  
         [0016]     As shown, the video source  12  includes a processor  16  that can access a program memory  18  to function in accordance with present principles. The program memory  18  can be any appropriate memory including, without limitation, disk and/or solid state memory.  
         [0017]     As also shown in  FIG. 1 , the display system  14  may include a processor  20  that can access a program memory  22  to function in accordance with present principles. The program memory  22  can be any appropriate memory including, without limitation, disk and/or solid state memory.  
         [0018]     In addition to or in lieu of the program memory  22 , the display system  14  may access a format information storage apparatus, such as but not limited to an extended display information data (EDID) electrically erasable programmable read-only memory (EEPROM)  24 . In accordance with present principles, the EEPROM  24  is dynamically changeable by a user to indicate a user-preferred format and if desired other display data for communication thereof to the video source  12 . The user-definable preferred video format may be established by appropriately manipulating a remote control device  26 , such as a TV remote control, in response to a format selection prompt that may be presented, along with video, on a monitor or display device  28 .  
         [0019]     In accordance with present principles, the video source  12  may be, without limitation, a DVD player, a satellite receiver, a set-top box, and so on. On the other hand, the display system  14  may be, without limitation, a television display system including a cathode ray tube (CRT) display, a liquid crystal display (LCD) or other flat-panel display, etc. The display system  14  is capable of displaying video in a user-selectable one of plural formats on the display device  28 . These formats include various timings and related aspect ratios, e. and without limitation, 480 scans lines either progressive scan (480p) or interlaced output scan (480i), and 720 lines progressive scan, and 1,080 lines interlaced output scans, in conventional 16:9 aspect ratios or in high definition (HD) 4:3 aspect ratios. As is well known in the art, these format parameters are associated with respective “timings”, i.e., the scan timing depends on, among other things, the number of scan lines and the aspect ratio.  
         [0020]     Now referring to  FIG. 2 , the general logic for dynamically establishing the display format is shown. Starting at block  30 , the logic dynamically establishes the preferred display format at the display system. In one non-limiting embodiment, this may be done by allowing the user to appropriately enter information representing the user-preferred display format into the E-EDID data, e.g., information representing the user&#39;s preferred format in terms of timing and/or scan lines and/or aspect ratio. Upon plug and play connection, e.g. hot plug detect, a DO loop occurs at block  32 , moving the logic to block  34 . At block  34 , the display device requests the video source to send data in the preferred format to be shown to the user. The preferred format may be established based on one of two of the specific implementation processes outlined in  FIGS. 3 and 4 .  
         [0021]     In one exemplary non-limiting implementation, the logic at block  30  in  FIG. 2  may be executed by setting a flag in block  0  of the EDID data which points to the first descriptor block in block  1 . The first descriptor block can have a so-called “CEA” header having a table of short video format descriptors, and a bit in the descriptor that is preferred by the user may be set in accordance with the logic at block  30  of  FIG. 2  to indicate that it is the preferred format.  
         [0022]      FIG. 3  shows one specific implementation for allowing the user to define a preferred video format. At block  36 , the user manipulates the button or menu entry on the video display (using the remote control  26  shown in  FIG. 1  or other control device). Available format timing descriptions then cycle on the display screen as the “preferred” format as indicated at block  38 . In one non-limiting implementation, the “preferred” format is reflected in block  0  of the E-EDID data. At block  40  the user selects, e.g., by pushing the “enter” button on the remote control device  26 , the format timing preferred by the user. Block  42  shows that the EEPROM configurations are changed as necessary to reflect the preferred format requested. Video sent from the video source to the video display will then be in the user-specified format. In the particular implementation shown in  FIG. 3 , the EEPROM EDID data contains all the possible formats used by the display device, and identifies, for subsequent access by the source, the preferred format; accordingly, since all possible formats are always present in the EDID data in the EEPROM, the check sum of the EDID does not change.  
         [0023]     An example of how to implement this method would be for the user to decide which format is desired before the beginning of the data display. This can be done upon display system startup at a formatting screen presented to the user before the “normal” viewing screen appears, where all the formatting options are presented to the user. The format chosen by the user&#39;is then entered into the EEPROM for subsequent access by a video source in determining which video format to use.  
         [0024]     A second method of specific implementation for establishing a preferred video format is shown in  FIG. 4 . Commencing at block  44 , the user manipulates a button to select a menu entry on the display using, e.g., a remote control device to display different format options/choices. As the user cycles through the format choices, the EDID in the EEPROM is modified to list only the choice of format that is currently displayed on the video display screen, as indicated in block  46 . As indicated at block  48 , the check sum of the EDID is modified as necessary to reflect the user&#39;s format choice, since at the end of the selection process EDID data representing some non-preferred formats is eliminated from the EEPROM. In other words, this method outlines a procedure for “flipping” through the different format choices until one that is most acceptable to the user is displayed on the screen and exclusively entered into the EEPROM EDID data.  
         [0025]     While the particular SYSTEM AND METHOD FOR DYNAMICALLY ESTABLISHING EXTENDED DISPLAY IDENTIFICATION DATA as herein shown and described in detail is fully capable of attaining the above-described objects of the invention, it is to be understood that it is the presently preferred embodiment of the present invention and is thus representative of the subject matter which is broadly contemplated by the present invention, that the scope of the present invention fully encompasses other embodiments which may become obvious to those skilled in the art, and that the scope of the present invention is accordingly to be limited by nothing other than the appended claims, in which reference to an element in the singular is not intended to mean “one and only one” unless explicitly so stated, but rather “one or more”. It is not necessary for a device or method to address each and every problem sought to be solved by the present invention, for it to be encompassed by the present claims. Furthermore, no element, component, or method step in the present disclosure is intended to be dedicated to the public regardless of whether the element, component, or method step is explicitly recited in the claims. Absent express definitions herein, claim terms are to be given all ordinary and accustomed meanings that are not irreconcilable with the present specification and file history.