Method and apparatus for remote input/output in a computer system

• US 8,874,812 B1
• Filed: 10/10/2013
• Issued: 10/28/2014
• Est. Priority Date: 03/30/2005
• Status: Active Grant

• Current Assignee: Teradici Corporation (HP Inc.)
• Original Assignee: Teradici Corporation (HP Inc.)
• Inventors: Hobbs, David Victor, Main, Ian Cameron
• Primary Examiner(s): SNYDER, STEVEN G
• Application Number:
  US14/051,006
• Time in Patent Office: 383 Days
• Field of Search: None
• US Class Current: 710/58
• 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: G06F 3/1454 involving copying of the display data of a local workstation or window to a remote workstation or window so that an actual copy of the data is displayed simultaneously on two or more displays, e.g. teledisplay
• CPC Class Codes: G09G 2370/042 for monitor identification
• CPC Class Codes: G09G 2370/10 Use of a protocol of communication by packets in interfaces along the display data pipeline
• CPC Class Codes: G09G 2370/12 Use of DVI or HDMI protocol in interfaces along the display data pipeline
• CPC Class Codes: G09G 2370/16 Use of wireless transmission of display information
• 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: G09G 5/14 Display of multiple viewports
• CPC Class Codes: G09G 5/363 Graphics controllers
• CPC Class Codes: H04N 21/43635 HDMI
• CPC Class Codes: H04N 21/64322 IP

Abstract

A method for communicating media between a host and a display system. In one embodiment the method comprises acquiring, by the host and via a wireless connection between the host and the display system, display information of the display system; generating, by the host, an image sequence at a resolution and a frame rate, the resolution and the frame rate determined from the display information; communicating, from the host to the display system and via the wireless connection, an encoding of the image sequence; and displaying, by the display system, a decoding of the encoding.

Claims

1. A method for communicating media between a host and a display system, comprising:

acquiring, by the host and via a wireless connection between the host and the display system, display information of the display system;

generating, by the host, an image sequence at a resolution and a frame rate, the resolution and the frame rate determined from the display information;

communicating, from the host to the display system and via the wireless connection, an encoding of the image sequence; and

displaying, by the display system, a decoding of the encoding, wherein displaying the decoding comprises displaying frames of the decoding at a display frame rate derived from a clock of the display system, and wherein the display system adjusts a frequency of the clock to establish and maintain a phase lock between matching frames of the communicated encoding and frames of the displayed decoding; and

wherein the display system further adjusts the frequency of the clock to establish and maintain a latency, between the encoding received at the display system and a display of the decoding, at less than a defined level.

2. The method of claim 1, wherein the defined level is based on transport latency variations of communicating the encoding and an initial frequency of the clock is determined from the resolution and the frame rate.

3. The method of claim 1, wherein the defined level is less than a frame period of the image sequence.

4. The method of claim 1, wherein communicating the encoding comprises communicating a plurality of scan lines as digital data over the wireless connection.

5. The method of claim 1, wherein communicating the encoding comprises communicating a plurality of packets of digital data over the wireless connection.

6. The method of claim 1, wherein the display information comprises display capabilities of the display system, the display capabilities comprising a plurality of resolutions and frame rates supported by a display of the display system.

7. The method of claim 1, wherein generating the image sequence comprises generating a plurality of image frames of red, green and blue pixels, and wherein decoding the encoding generates a lossless reproduction of the plurality of image frames.

8. The method of claim 7, wherein the image sequence is 1920 pixels wide, and wherein communicating the encoding comprises communicating 60 image frames per second.

9. The method of claim 1, further comprising generating an audio stream, encoding the audio stream and communicating the encoded audio stream synchronous with generating the image sequence, encoding the image sequence to generate the encoding, and communicating the encoding;

wherein the display system receives the encoded audio stream and presents an audio decoding of the encoded audio stream synchronous with displaying the decoding.

10. The method of claim 1, wherein the decoding is a lossless reproduction of the image sequence.

11. The method of claim 1, wherein the decoding is a lossy reproduction of the image sequence and the host generates the encoding based on an available bandwidth of the wireless connection.

12. The method of claim 1, wherein communicating content between the host and the display system is disabled based on an authorization criteria.

13. The method of claim 1, wherein acquiring the display information comprises communicating the display information over a Display Data Channel (DDC) of the wireless connection.

14. The method of claim 1, wherein the wireless connection is a lossy communication channel and communicating the encoding comprises the display system communicating an indication of a loss of content of the encoding to the host.

15. The method of claim 1, wherein acquiring the display information and displaying the decoding operate as if a display displaying the decoding was connected directly to a resource generating the image sequence.

16. The method of claim 1, wherein the wireless connection is an Internet Protocol (IP) network and generating the image sequence comprises a computer application of the host generating both the image sequence and an audio sequence in response to an event from an input device coupled to the display system, wherein the audio sequence is played out on a speaker of the display system.

17. The method of claim 16, wherein the input device is coupled to a Universal Serial Bus (USB) controller of the display system, and wherein the event is communicated between the USB controller and the host as a transfer descriptor generated by the USB controller.

18. The method of claim 1, wherein the display system is a wireless device.