Cable with fade and hot plug features

• US 8,725,918 B2
• Filed: 06/12/2012
• Issued: 05/13/2014
• Est. Priority Date: 02/29/2012
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Sharma, Anup K., Krueger, Scott P., Hollabaugh, James M., Yepez, Roberto G., Adler, Mitchell D., Tripathi, Brijesh, Terlizzi, Jeffrey J.
• Primary Examiner(s): SHIN, CHRISTOPHER B
• Application Number:
  US13/494,179
• Publication Number:
  US 20130227631A1
• Time in Patent Office: 700 Days
• Field of Search: 710 62- 72, 710/305, 345/156, 345/204, 386/231, 386/232
• US Class Current: 710/72
• 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, in response to a communication by the host computing device that a source video stream is changing in a fashion that is not to be displayed on the external display, is configured to invoke a fade feature.

2. The cable as recited in claim 1 wherein, in response to a second communication by the host computing device that the source video stream has stabilized, the video processing system is configured to de-invoke the fade feature.

3. The cable as recited in claim 2 wherein the second communication is a symbol embedded in a source video stream.

4. The cable as recited in claim 2 wherein, in response to de-invoking the fade, the video processing system is configured to transmit frames from the host computing device for display on the external display.

5. The cable as recited in claim 1 wherein the fade feature comprises fading the external display to black.

6. The cable as recited in claim 1 wherein the fade feature comprises retaining a most recent frame from the host processing system and displaying the retained frame.

7. The cable as recited in claim 1 wherein a change in the source video stream that is not to be displayed is a rotation of the image in response to a change in orientation of the host processing device.

8. The cable as recited in claim 1 wherein the communication is a symbol embedded in a source video stream.

9. The cable as recited in claim 1 wherein the video processing system comprises a plurality of banks of configuration registers, and wherein the video processing system is configured to switch between one of the plurality of banks and another one of the plurality of banks responsive to a second communication from the host computing device.

10. The cable as recited in claim 9 wherein the second communication is a symbol embedded in a source video stream.

11. The cable as recited in claim 1 wherein the cable is configured to carry audio data in addition to the frames, and wherein the video processing system comprises a programmable delay for the audio data, wherein the delay is programmable to match a video delay through the video processing system.

12. The cable as recited in claim 1 wherein the cable is configured to carry audio data in addition to the frames, and wherein the video processing system comprises a white noise block configured to insert low frequency white noise on the audio data.

13. The cable as recited in claim 1 wherein the video processing system comprises a memory configured to store the frames being manipulated, and wherein the memory is further configured to store a second image, and wherein the video processing system is configured to display the second image on the external display responsive to a lack of frames received from the host computing device.