VIDEO DISPLAY APPARATUS, VIDEO OUTPUT APPARATUS, CONTROL METHODS THEREOF, AND VIDEO DISPLAY SYSTEM

• US 20120257105A1
• Filed: 03/29/2012
• Published: 10/11/2012
• Est. Priority Date: 04/08/2011
• Status: Active Grant

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Kimoto, Tatsuya
• Granted Patent: US 8,885,100 B2
• Time in Patent Office: Days
• US Class Current: 348/441
• CPC Class Codes: G06F 3/14 Digital output to display device ; Cooperation and interconnection of the display device with other functional units
• CPC Class Codes: G09G 2330/026 Arrangements or methods related to booting a display
• CPC Class Codes: G09G 2330/12 Test circuits or failure detection circuits included in a display system, as permanent part thereof
• CPC Class Codes: G09G 2340/0407 Resolution change, inclusive of the use of different resolutions for different screen areas
• CPC Class Codes: G09G 2360/02 Graphics controller able to handle multiple formats, e.g. input or output formats
• CPC Class Codes: G09G 2370/047 using display data channel standard [DDC] communication
• CPC Class Codes: G09G 2370/12 Use of DVI or HDMI protocol in interfaces along the display data pipeline
• CPC Class Codes: G09G 2370/22 Detection of presence or absence of input display information or of connection or disconnection of a corresponding information source
• CPC Class Codes: G09G 5/003 Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto specific for a CRT G09G1/165; for a flat panel G09G3/2092
• CPC Class Codes: G09G 5/006 Details of the interface to the display terminal specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04
• CPC Class Codes: H04N 21/4621 Controlling the complexity of the content stream or additional data, e.g. lowering the resolution or bit-rate of the video stream for a mobile client with a small screen arrangements for using the results of monitoring on user's side in broadcast systems H04H60/65; flow control in packet networks H04L47/10

Abstract

Compatible video signal information having first information indicating a pixel number of a video signal displayable by a video display apparatus and second information that is setting information required in order for the video display apparatus to display a video signal having the pixel number is transmitted to a video output apparatus. In the case where a video signal received from the video output apparatus after the compatible video signal information is transmitted is a video signal having a pixel number displayable by the video display apparatus but not being displayable, the compatible video signal information is updated so that setting information for the pixel number of that video signal is included in the second information.

Claims

1. A video display apparatus provided with a notifying unit configured to transmit, to a video output apparatus, compatible video signal information having first information indicating a plurality of pixel numbers of video signal displayable by the video display apparatus and second information that is setting information required in order for the video output apparatus to generate video signals having at least a portion of the plurality of pixel numbers and being displayable by the video display apparatus, comprising:

a determining unit configured to determine whether a video signal received from the video output apparatus after the compatible video signal information is transmitted to the video output apparatus by the notifying unit is a video signal having a pixel number displayable by the video display apparatus and being displayable by the video display apparatus; and

an updating unit configured to update the second information of the compatible video signal information, in a case where it is determined by the determining unit that the video signal received from the video output apparatus is a video signal having a pixel number displayable by the video display apparatus and not being displayable by the video display apparatus, such that the setting information for the pixel number of the video signal received from the video output apparatus is included in the second information,

wherein the notifying unit transmits the compatible video signal information updated by the updating unit to the video output apparatus.

2. The video display apparatus according to claim 1, wherein the updating unit updates the second information, in a case where the pixel number of the video signal received from video output apparatus is included in the first information of the compatible video signal information transmitted to the video output apparatus before the video signal is received.

3. The video display apparatus according to claim 1, wherein the updating unit does not update the second information, in a case where the setting information for the pixel number of the video signal received from video output apparatus is included in the second information of the compatible video signal information transmitted to the video output apparatus before the video signal is received.

4. The video display apparatus according to claim 1, wherein the setting information includes at least one of video signal pixel clock, effective pixels, blanking, front porch, sync width, image size and interlacing.

5. A video output apparatus comprising:

a first obtaining unit configured to obtain, from a video display apparatus, compatible video signal information having first information indicating a plurality of pixel numbers of video signals displayable by the video display apparatus and second information that is setting information required in order for the video output apparatus to generate video signals having at least a portion of the plurality of pixel numbers and being displayable by the video display apparatus;

a determining unit configured to determine whether output of a video signal displayable by the video display apparatus is possible, based on the first information and the second information of the compatible video signal information obtained by the first obtaining unit;

a selecting unit configured to select one pixel number scheduled for output included in the first information that is outputtable by the video output apparatus, in a case where it is determined by the determining unit that a video signal displayable by the video display apparatus cannot be generated since a pixel number outputtable by the video output apparatus is included in the first information but setting information required in order to generate a video signal having the pixel number outputtable by the video output apparatus is not included in the second information;

a second obtaining unit configured to obtain the setting information for the pixel number scheduled for output selected by the selecting unit from the video display apparatus; and

an output unit configured to generate a video signal having the pixel number scheduled for output, based on the setting information for the pixel number scheduled for output obtained by the second obtaining unit, and to output the generated video signal to the video display apparatus.

6. The video output apparatus according to claim 5,

wherein in a case where the output unit is not able to generate a video signal that is based on the setting information for the pixel number scheduled for output that is obtained by the second obtaining unit,

the selecting unit selects a pixel number that differs from the pixel number scheduled for output, as a new pixel number scheduled for output, from pixel numbers outputtable by the video output apparatus that are included in the first information, and

the second obtaining unit obtains the setting information for the new pixel number scheduled for output from video display apparatus.

7. The video output apparatus according to claim 5, wherein the setting information includes at least one of video signal pixel clock, effective pixels, blanking, front porch, sync width, image size, and interlacing.

8. A video display apparatus for displaying a video signal output from the video output apparatus according to claim 5, comprising:

a notifying unit configured to transmit, to the video output apparatus, compatible video signal information having first information indicating a plurality of pixel numbers of video signals displayable by the video display apparatus and second information that is setting information required in order for the video output apparatus to generate video signals having at least a portion of the plurality of pixel numbers and being displayable by the video display apparatus; and

a transmitting unit configured to, in a case where a request for the setting information for a pixel number scheduled for output by the video output apparatus is received from the video output apparatus after the compatible video signal information is transmitted to the video output apparatus by the notifying unit, transmit the setting information for the pixel number scheduled for output to the video output apparatus.

9. The video display apparatus according to claim 8, wherein the setting information includes at least one of video signal pixel clock, effective pixels, blanking, front porch, sync width, image size, and interlacing.

10. A video display system comprising:

the video output apparatus according to claim 5; and

a video display apparatus for displaying a video signal output from the video output apparatus, comprising;

a notifying unit configured to transmit, to the video output apparatus, compatible video signal information having first information indicating a plurality of pixel numbers of video signals displayable by the video display apparatus and second information that is setting information required in order for the video output apparatus to generate video signals having at least a portion of the plurality of pixel numbers and being displayable by the video display apparatus; and

a transmitting unit configured to, in a case where a request for the setting information for a pixel number scheduled for output by the video output apparatus is received from the video output apparatus after the compatible video signal information is transmitted to the video output apparatus by the notifying unit, transmit the setting information for the pixel number scheduled for output to the video output apparatus.

13. A control method of a video display apparatus for displaying a video signal output from the video output apparatus according to claim 5, comprising:

a notifying step of transmitting, to the video output apparatus, compatible video signal information having first information indicating a plurality of pixel numbers of video signals displayable by the video display apparatus and second information that is setting information required in order for the video output apparatus to generate video signals having at least a portion of the plurality of pixel numbers and being displayable by the video display apparatus; and

a transmitting step of, in a case where a request for the setting information for a pixel number scheduled for output by the video output apparatus is received from the video output apparatus after the compatible video signal information is transmitted to the video output apparatus in the notifying step, transmitting the setting information for the pixel number scheduled for output to the video output apparatus.

11. A control method of a video display apparatus provided with a notifying unit configured to transmit, to a video output apparatus, compatible video signal information having first information indicating a plurality of pixel numbers of video signals displayable by the video display apparatus and second information that is setting information required in order for the video output apparatus to generate video signals having at least a portion of the plurality of pixel numbers and being displayable by the video display apparatus, comprising:

a determining step of determining whether a video signal received from the video output apparatus after the compatible video signal information is transmitted to the video output apparatus by the notifying unit is a video signal having a pixel number displayable by the video display apparatus and being displayable by the video display apparatus; and

an updating step of updating the second information of the compatible video signal information, in a case where it is determined in the determining step that the video signal received from the video output apparatus is a video signal having a pixel number displayable by the video display apparatus and not being displayable by the video display apparatus, such that the setting information for the pixel number of the video signal received from the video output apparatus is included in the second information, wherein the compatible video signal information updated in the updating step is transmitted to the video output apparatus.

12. A control method of a video output apparatus, comprising:

a first obtaining step of obtaining, from a video display apparatus, compatible video signal information having first information indicating a plurality of pixel numbers of video signals displayable by the video display apparatus and second information that is setting information required in order for the video output apparatus to generate video signals having at least a portion of the plurality of pixel numbers and being displayable by the video display apparatus;

a determining step of determining whether output of a video signal displayable by the video display apparatus is possible, based on the first information and the second information of the compatible video signal information obtained in the first obtaining step;

a selecting step of selecting one pixel number scheduled for output included in the first information that is outputtable by the video output apparatus, in a case where it is determined in the determining step that a video signal displayable by the video display apparatus cannot be generated since a pixel number outputtable by the video output apparatus is included in the first information but setting information required in order to generate a video signal having the pixel number outputtable by the video output apparatus is not included in the second information;

a second obtaining step of obtaining the setting information for the pixel number scheduled for output selected in the selecting step from the video display apparatus; and

an output step of generating a video signal having the pixel number scheduled for output, based on the setting information for the pixel number scheduled for output obtained in the second obtaining step, and outputting the generated video signal to the video display apparatus.