Wireless display

• US 20030017846A1
• Filed: 06/12/2002
• Published: 01/23/2003
• Est. Priority Date: 06/12/2001
• Status: Abandoned Application

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: DuVal, Mary A., Estevez, Leonardo W., Moizio, Frank J., Bommersbach, William M.
• Application Number:
  US10/167,790
• Publication Number:
  US 20030017846A1
• Time in Patent Office: Days
• US Class Current: 455/556.1
• CPC Class Codes: H04B 1/3816 Mechanical arrangements for accommodating identification devices, e.g. cards or chips; with connectors for programming identification devices
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/60 Network streaming of media packets
• CPC Class Codes: H04L 65/70 Media network packetisation
• CPC Class Codes: H04N 1/192 Simultaneously or substantially simultaneously scanning picture elements on one main scanning line
• CPC Class Codes: H04N 19/127 Prioritisation of hardware or computational resources
• CPC Class Codes: H04N 19/154 Measured or subjectively estimated visual quality after decoding, e.g. measurement of distortion use of rate-distortion criteria H04N19/147
• CPC Class Codes: H04N 19/192 the adaptation method, adaptation tool or adaptation type being iterative or recursive
• CPC Class Codes: H04N 19/59 involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution
• CPC Class Codes: H04N 21/4122 additional display device, e.g. video projector digital output for controlling a plurality of local displays G06F3/1423
• CPC Class Codes: H04N 21/43637 involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11] arrangements for wireless networking or broadcasting of information in indoor or near-field type systems H04B10/114
• CPC Class Codes: H04N 21/440263 by altering the spatial resolution, e.g. for displaying on a connected PDA
• CPC Class Codes: H04N 9/67 for matrixing camera processing pipelines for matrixing of colour signals H04N23/85
• CPC Class Codes: H04W 12/033 of the user plane, e.g. user's traffic
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A wireless link between a hand-held or portable device and a display device (projector). The highly optimized, DSP generated, graphic rendering code and JPEG decompression code provides the real-time rendering requirements necessary to offer cable-like connectivity from a remote device to a wireless projector. The projector is capable of receiving, decompressing, decoding, and displaying images in real-time. The system of the present invention incorporates digital signal processor (DSP) accelerated 802.11 compression and encryption capability, which is provided in a standard 802.11 PCMCIA card format. In one application, the hand-held device displays a low-resolution version of a particular image, such as a thumbnail, and may also provide a list of images available for display on the projector at full-resolution. Interactive Codec (coder/decoder) capability for use in remote PC video applications is also provided. The Codec iteratively compresses sub-sampled on-screen video data locally starting with less computationally complex techniques with the viewer interactively increasing the complexity until acceptable data is presented.

Claims

1. A method for wireless image transfer, the method comprising:

compressing video bit-map data in a portable device using a graphics device interface mirror driver system;

encrypting said compressed video data in said portable device using said mirror driver system;

transmitting said video data over a wireless radio frequency link for display by a wireless display device.

2. The method of claim 1, further comprising:

using digital signal processor accelerator encryption techniques for encrypting data originating in said portable device prior to transmitting over said wireless link.

3. The method of claim 1, further comprising:

using digital signal processor accelerator decoding techniques in said display device for decoding said video data prior to displaying said data.

4. The method of claim 1, wherein said portable device is a personal computer using a Codec with a remote high-refresh rate graphics terminal, said method further comprising:

iteratively compressing sub-sampled on-screen video locally at said computer using minimal computational complex techniques;

such that

if compression is acceptable, transmitting said video data over said wireless link to said remote wireless interface module;

otherwise, increasing the complexity of said compression technique until compression is acceptable; and

transmitting said video data over said wireless link to said remote wireless interface module.

5. The method of claim 4, further comprising:

using run length encoding techniques for images with wide uniform areas; and

using more complex histogram techniques for other dithered graphic images.

6. The method of claim 1, wherein said portable device is a personal computer, said method further comprising:

capturing the graphics device interface data from said computer'"'"'s operating system using a resident mirror driver;

encapsulating said graphics device interface data in a proprietary data packet format;

transmitting said data packet;

receiving said data packet at said wireless interface module;

reconstructing said image; and

displaying said image at a continuous rate by means of said display device.

7. The method of claim 1, said compressing comprising:

compressing video data sourced by at least one device from the group comprised of;

notebook computer, personal digital assistant, cellular telephone, palm-type computing device, digital camera, and camcorder.

8. The method of claim 1, comprising:

displaying a low-resolution thumbnail version of an image on said portable device.

9. The method of claim 1, comprising:

selecting an image from a list of available images to initiate the transfer of a corresponding compressed image to said display.

10. A method for wireless image transfer, the method comprising:

receiving video data in a wireless interface module with video data decoding/decompressing capability;

interpreting said graphics device interface commands in said wireless interface module;

decoding said video data in said wireless interface module;

decompressing said video data in said wireless interface module; and

displaying said video data on a display device.

11. The method of claim 10, said receiving comprising:

receiving video data sourced by at least one device from the group comprised of;

notebook computer, personal digital assistant, cellular telephone, palm-type computing device, digital camera, and camcorder.

12. The method of claim 10, further comprising:

using digital signal processor accelerator compression techniques for compressing data originating in said portable device prior to transmitting over said wireless link; and

13. The method of claim 10, further comprising:

using digital signal processor accelerator decompression techniques in said display device for decompressing said video data prior to displaying said data.

15. The system of claim 14, said digital signal processor accelerator comprised of a 802.11 PCMCIA card embedded in said portable device.

16. The system of claim 14, said portable device having a mirror driver, said mirror driver operable to capture the graphics device interface data from said portable device'"'"'s operating system, said data being encapsulated in a packet format, and said formatted video image data being transmitted over said wireless link.

17. The system of claim 14, said portable device operable as a Codec to:

iteratively compress sub-sampled on-screen video locally using minimal computational complex techniques, such that

transmit said video data over said wireless link to a remote wireless interface module if the level of compression is acceptable;

increase said compression complexity when said compression is unacceptable until compression is acceptable; and

transmitted said video data is over said wireless link to a remote wireless interface module.

14. A system for wireless video image data transfer from a portable device, comprising:

a portable device for generating video image data;

at least one digital signal processor accelerator selected from the group consisting of a digital signal processor compression accelerator and a digital signal processor encryption accelerator coupled to said portable device for processing said video image data; and

a transmitter embedded in said portable device for transmitting said processed video image data over a radio frequency wireless link.

18. A display device comprising:

a wireless interface module for receiving video image data;

at least one digital signal processor accelerator selected from the group consisting of a digital signal processor decompression accelerator and a digital signal processor decryption accelerator embedded in said wireless interface module for processing said video image data; and

a display device coupled to said wireless interface module to receive and display said processed video image data.