Cable with Video Processing Capability

• US 20130222698A1
• Filed: 06/12/2012
• Published: 08/29/2013
• Est. Priority Date: 02/29/2012
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Sharma, Anup K., Hollabaugh, James M., Yepez, Roberto G., Terlizzi, Jeffrey J., Krueger, Scott P., Tripathi, Brijesh
• Granted Patent: US 9,652,194 B2
• Time in Patent Office: Days
• US Class Current: 348/581
• CPC Class Codes: G06F 13/385 for adaptation of a particular data processing system to different peripheral devices
• CPC Class Codes: G06F 13/4013 with data re-ordering, e.g. Endian conversion
• CPC Class Codes: G06F 13/4018 with data-width conversion
• 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 3/1431 using a single graphics controller
• CPC Class Codes: G06T 1/60 Memory management
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

In an embodiment, a host computing device includes an internal display and also includes a connector to connect to an external display. A cable is provided to connect to the connector and to connect to the external display. The cable includes video processing capabilities. For example, the cable may include a memory configured to store a frame buffer. The frame buffer may store a frame of video data for further processing by the video processing device in the cable. The video processing device may manipulate the frame in a variety of ways, e.g. scaling, rotating, gamma correction, dither correction, etc.

Claims

1. A cable comprising:

a host connector configured to connect to a host computing device;

an external display connector configured to connect to an external display;

a transmission medium coupled between the host connector and the external display connector; and

a video processing system embedded in the cable, wherein the video processing system is configured to perform one or more video processing operations on frames transmitted over the cable by the host computing device for display on the external display, wherein the video processing operations comprise rotation.

2. The cable as recited in claim 1 wherein the video processing system comprises a frame buffer configured to store a first frame prior to performing the one or more video processing operations on the first frame.

3. The cable as recited in claim 1 wherein the video processing system is powered over the cable by the host computing device.

4. The cable as recited in claim 1 wherein the video processing operations further comprise scaling.

5. A cable comprising:

a host connector configured to connect to a host computing device;

an external display connector configured to connect to an external display;

a transmission medium coupled between the host connector and the external display connector; and

a video processing system integrated into the cable, wherein the video processing system is configured to perform one or more video processing operations on frames transmitted over the cable by the host computing device for display on the external display, wherein the video processing operations comprise a dither operation.

6. The cable as recited in claim 5 wherein the dither operation reverses dithering performed on the host computing device.

7. The cable as recited in claim 6 wherein the video processing system is configured to store a de-dither table to control the reversal of the dithering performed on the host computing device.

8. The cable as recited in claim 7 wherein the de-dither table is downloaded to the video processing system from the host computing device.

9. The cable as recited in claim 5 wherein the dither operation comprises dithering the frames responsive to one or more properties of the external display.

10. A cable comprising:

a host connector configured to connect to a host computing device;

an external display connector configured to connect to an external display;

a transmission medium coupled between the host connector and the external display connector; and

a video processing system in the cable, wherein the video processing system is configured to perform one or more video processing operations on frames transmitted over the cable by the host computing device for display on the external display, wherein the video processing operations comprise a gamma operation.

11. The cable as recited in claim 10 wherein the gamma operation is a standard gamma correction.

12. The cable as recited in claim 10 wherein the gamma operation is a gamma correction that is specific to the external display.

13. The cable as recited in claim 10 wherein the gamma operation reverses a gamma correction applied by the host computing device.

14. A method comprising:

receiving one or more frames in a video processing system embedded within a cable coupled between a host computing device and an external display, the one or more frames transmitted over the cable from the host computing device; and

the video processing system performing one or more of a dither operation and a gamma operation on the one or more frames to generate one or more output frames; and

the video processing system transmitting the output frames for display on the external display.

15. The method as recited in claim 14 wherein the dither operation comprises reversing a dither applied by the host computing device.

16. The method as recited in claim 14 wherein the gamma operation comprises reversing a gamma correction applied by the host computing device.

17. The method as recited in claim 14 wherein the gamma operation comprises a standard gamma correction that is independent of properties of the external display.

18. The method as recited in claim 14 further comprising applying a rotation to the one or more frames.

19. A system comprising:

a host computing device comprising a host display, wherein the host computing device is configured to generate one or more first frames to be displayed on the host display and on an external display, wherein the host computing device is configured to perform a horizontal scaling on the one or more first frames to generate one or more second frames be transmitted to the external display;

the external display; and

a cable coupled between the host computing device and the external display, wherein the host computing device is configured to transmit he one or more second frames over the cable comprising an embedded video processing system configured to vertically scale the one or more second frames received on the cable to produce one or more third frames, wherein the vertical scaling recovers an original aspect ratio of the one or more first frames, and wherein the embedded video processing system is configured to transmit the one or more third frames to the external display.

20. The system as recited in claim 19 wherein the video processing system is powered by the host computing device over the cable.

21. The system as recited in claim 19 wherein the video processing system is configured to perform one or more additional video processing operations on the one or more second frames to produce the one or more third frames.

22. The system as recited in claim 21 wherein the one or more additional video processing operations comprise a dither operation.

23. The system as recited in claim 21 wherein the one or more additional video processing operations comprise a gamma correction operation.

24. The system as recited in claim 21 wherein the one or more additional video processing operations comprise a rotation operation.