Video display apparatus, video output apparatus, control methods thereof, and video display system

• US 8,885,100 B2
• Filed: 03/29/2012
• Issued: 11/11/2014
• 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
• Primary Examiner(s): Harold, Jefferey
• Assistant Examiner(s): TEITELBAUM, MICHAEL E
• Application Number:
  US13/433,954
• Publication Number:
  US 20120257105A1
• Time in Patent Office: 957 Days
• Field of Search: 348/441
• 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 output apparatus comprising:

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

a first determining unit configured to determine whether the video output apparatus is able to output a video signal corresponding to the second information obtained by the first obtaining unit;

a second determining unit configured to determine whether the video output apparatus is able to output a video signal corresponding to the first information obtained by the first obtaining unit;

a second obtaining unit configured to, in a case where it is determined by the first determining unit that the video output apparatus is not able to output the video signal corresponding to the second information and where it is determined by the second determining unit that the video output apparatus is able to output the video signal corresponding to the first information, select a first pixel number, that the video output apparatus is able to output, from the plurality of pixel numbers and obtain the detailed setting information for the first pixel number; and

an output unit configured to generate a video signal corresponding to the detailed setting information obtained by the second obtaining unit, and to output the generated video signal to the video display apparatus,

wherein the detailed setting information for the first pixel number is information which is not included in the first information and the second information.

2. The video output apparatus according to claim 1,

wherein, in a case where the output unit is not able to generate a video signal corresponding to the detailed setting information for the first pixel number obtained by the second obtaining unit,

the second obtaining unit selects a second pixel number that differs from the first pixel number from the plurality of pixel numbers included in the first information, makes a request for the detailed setting information for the second pixel number to the video display apparatus, and obtains the detailed setting information for the second pixel number.

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

9. The video output apparatus according to claim 1, wherein, in a case where the output unit is not able to generate a video signal corresponding to the detailed setting information for the first pixel number obtained by the second obtaining unit, the output unit generates a video signal, which is not corresponding to the detailed setting information obtained by the second obtaining unit and has the first pixel number that the video output apparatus is able to output, and outputs the generated video signal to the video display apparatus.

10. The video output apparatus according to claim 1, wherein

the first information is information according to Standard Timing and Established Timing which are defined in EDID (Extended Display Identification Data), and

the second information is information according to Detailed Timing which is defined in EDID.

4. A video display apparatus for displaying a video signal output from a video output apparatus,

wherein the video output apparatus comprises:

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

a first determining unit configured to determine whether the video output apparatus is able to output a video signal corresponding to the second information obtained by the first obtaining unit;

a second determining unit configured to determine whether the video output apparatus is able to output a video signal corresponding to the first information obtained by the first obtaining unit;

a second obtaining unit configured to, in a case where it is determined by the first determining unit that the video output apparatus is not able to output the video signal corresponding to the second information and where it is determined by the second determining unit that the video output apparatus is able to output the video signal corresponding to the first information, select a first pixel number, that the video output apparatus is able to output, from the plurality of pixel numbers and obtain the detailed setting information for the first pixel number; and

an output unit configured to generate a video signal corresponding to the detailed setting information obtained by the second obtaining unit, and to output the generated video signal to the video display apparatus,

wherein the video display apparatus comprises;

a first transmitting unit configured to transmit the first information and the second information to the video output apparatus; and

a second transmitting unit configured to, in a case where a request for the detailed setting information for a first pixel number is received from the video output apparatus after the first information and the second information are transmitted by the first transmitting unit, transmit the detailed setting information for the first pixel number to the video output apparatus, and

wherein the detailed setting information for the first pixel number is information which is not included in the first information and the second information.

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

11. The video display apparatus according to claim 4, wherein

the first information is information according to Standard Timing and Established Timing which are defined in EDID (Extended Display Identification Data), and

the second information is information according to Detailed Timing which is defined in EDID.

6. A video display system comprising:

a video output apparatus; and

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

wherein the video output apparatus comprises;

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

a first determining unit configured to determine whether the video output apparatus is able to output a video signal corresponding to the second information obtained by the first obtaining unit;

a second determining unit configured to determine whether the video output apparatus is able to output a video signal corresponding to the first information obtained by the first obtaining unit;

a second obtaining unit configured to select, in a case where it is determined by the first determining unit that the video output apparatus is not able to output the video signal corresponding to the second information and where it is determined by the second determining unit that the video output apparatus is able to output the video signal corresponding to the first information, a first pixel number, that the video output apparatus is able to output, from the plurality of pixel numbers and obtain the detailed setting information for the first pixel number; and

an output unit configured to generate a video signal corresponding to the detailed setting information obtained by the second obtaining unit, and to output the generated video signal to the video display apparatus,

wherein the video display apparatus comprises;

a first transmitting unit configured to transmit the first information and the second information to the video output apparatus; and

a second transmitting unit configured to, in a case where a request for the detailed setting information for a first pixel number is received from the video output apparatus after the first information and the second information are transmitted by the first transmitting unit, transmit the detailed setting information for the first pixel number to the video output apparatus, and

wherein the detailed setting information for the first pixel number is information which is not included in the first information or the second information.

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

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

a first determining step of determining whether the video output apparatus is able to output a video signal corresponding to the second information obtained in the first obtaining step;

a second determining step of determining whether the video output apparatus is able to output a video signal corresponding to the first information obtained by the first obtaining step;

a second obtaining step of, in a case where it is determined in the first determining step that the video output apparatus is not able to output the video signal corresponding, to the second information and where it is determined by the second determining step that the video output apparatus is able to output the video signal corresponding to the first information, selecting a first pixel number, that the video output apparatus is able to output, from the plurality of pixel numbers and obtaining the detailed setting information for the first pixel number; and

an output step of generating a video signal corresponding to the detailed setting information obtained in the second obtaining step, and outputting the generated video signal to the video display apparatus.

12. The method according to claim 7,

wherein, in a case where the output step is not able to generate a video signal corresponding to the detailed setting information for the first pixel number obtained by the second obtaining unit,

the second obtaining step selects a second pixel number that differs from the first pixel number from the plurality of pixel numbers-included in the first information, makes a request for the detailed setting information for the second pixel number to the video display apparatus, and obtains the detailed setting information for the second pixel number.

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

14. The method according to claim 7, wherein, in a case where the output step is not able to generate a video signal corresponding to the detailed setting information for the first pixel number obtained in the second obtaining step, the output step generates a video signal, which is not corresponding to the detailed setting information obtained by the second obtaining step and has the first pixel number that the video output apparatus is able to output, and outputs the generated video signal to the video display apparatus.

15. The method according to claim 7, wherein

the first information is information according to Standard Timing and Established Timing which are defined in EDID (Extended Display Identification Data), and

the second information is information according to Detailed Timing which is defined in EDID.

8. A control method of a video display apparatus for displaying a video signal output from the video output apparatus comprising:

a first obtaining step, by a video output apparatus, configured to obtain, from a video display apparatus, first info indicating a plurality of pixel numbers of video signals displayable b the video display apparatus and second information that is detailed setting information required in order for the video output apparatus to gene e video signal having one of the plurality of pixel numbers;

a first determining step, by a video output apparatus, configured to determine whether the video output apparatus is able to output a video signal corresponding to the second information obtained in the first obtaining step;

a second determining step, by a video output apparatus, configured to determine whether the video output apparatus is able to output a video signal corresponding to the first information obtained in the first obtaining step;

a second obtaining step, by a video output apparatus, configured to, in a case where it is determined in the first determining step that the video output apparatus is not able to output the video signal corresponding to the second info on and where it is determined in the second determining s op that the video output apparatus is able to output the video signal corresponding to the first information, select a first pixel number, that the video output apparatus is able to output, from the plurality of pixel numbers and obtain the detailed setting information for the first pixel number; and

an output step, by a video output apparatus, configured to generate a video signal corresponding o the detailed setting information obtained in the second obtaining step, and to output the generated video signal to the video display apparatus,

a first transmitting step of transmitting, by the video display apparatus, the first information and the second information to the video output apparatus; and

a second transmitting step of, by the video display apparatus, in a case where a request for the detailed setting information for a first pixel number is received from the video output apparatus after the first information and the second information are transmitted in the first transmitting step, transmitting the detailed setting information for the first pixel number to the video output apparatus,

wherein the detailed setting information for the first pixel number is information which is not included in the first information and the second information.

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

17. The method according to claim 8, wherein

the first information is information according to Standard Timing and Established Timing which are defined in EDID (Extended Display Identification Data), and

the second information is information according to Detailed Timing which is defined in EDID.