Apparatus and method for providing computer display data from a computer system to a remote display device

• US 6,175,861 B1
• Filed: 02/06/1998
• Issued: 01/16/2001
• Est. Priority Date: 02/06/1998
• Status: Expired due to Fees

• Current Assignee: David A. Ferris, Henry R. Williams, Maurice B. Richard
• Original Assignee: David A. Ferris, Henry R. Williams, Maurice B. Richard
• Inventors: Ferris, David A., Richard, Maurice B., Williams, Henry R. Jr.
• Primary Examiner(s): Flynn, Nathan
• Assistant Examiner(s): Srivastava, Vivek
• Application Number:
  US09/020,196
• Time in Patent Office: 1,075 Days
• Field of Search: H04/N.538, H04/H.100, H04/H.114, 348/6, 348/723, 348/724, 348/488, 455/3.1, 455/4.1, 455/4.2, 455/3.2, 455/103, 455/59, 370/485, 370/486, 370/487, 370/537, 375/260, 709/217
• US Class Current: 709/217
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/611 for multicast or broadcast systems for broadcast or conference H04L12/18; arrangements for broadcast or distribution combined with broadcast H04H20/00; arrangements for broadcast applications with a direct linkage to broadcast information or to broadcast space-time H04H60/00; selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS], H04W4/06
• CPC Class Codes: H04L 65/70 Media network packetisation
• CPC Class Codes: H04N 21/4402 involving reformatting operations of video signals for household redistribution, storage or real-time display details of conversion of video standards at pixel level H04N7/01; video transcoding H04N19/40; adapting incoming signals to the display format of the display terminal G09G5/005; media handling at the source in data packet switching networks H04L65/764
• CPC Class Codes: H04N 21/4433 Implementing client middleware, e.g. Multimedia Home Platform [MHP]
• CPC Class Codes: H04N 21/8166 involving executable data, e.g. software arrangements for executing specific programs G06F9/44; broadcasting computer programmes in broadcast systems H04H20/91; involving the movement of software or configuration parameters H04L67/34

Abstract

A method and apparatus are provided for enabling multiple users to concurrently access a PC-based server in a home local area network using conventional TVs as display devices. A client system includes a TV, conventional input devices, such as a keyboard and a mouse, and a set top box for interfacing the TV to the network. The server maintains a system work area and multiple processes corresponding to user applications. The system work area is partitioned in the server into multiple independent, simultaneously active desktops, one desktop for each of the client systems. Individual processes are mapped to the appropriate desktop. Multiple frame buffers are maintained in the server, such that a different frame buffer is assigned to each client system. Each desktop is rendered within the server and stored in the corresponding frame buffer. The contents of each frame buffer are transmitted over a transmission medium to the set top box of the corresponding client system. Desktop display data is provided by the set top box to the corresponding TV for display to a user.

Claims

1. In a local area network including a computer system and a display device configured to input and respond to a plurality of separate color signals concurrently, a method of enabling the display device to display information generated by the computer system, the display device coupled to the computer system by a broadband transmission medium, the method comprising:

generating each of the color signals at the computer system;

modulating each of the color signals onto a different set of video channels, each set of video channels including a plurality of video channels, said modulating including time division multiplexing each of the color signals between each of the video channels in the set corresponding to said color signal;

transmitting the modulated color signals from the computer system onto the broadband transmission medium at an end of the transmission medium corresponding to the computer system;

receiving the modulated color signals at an end of the broadband transmission medium corresponding to the display device;

demodulating each of the modulated color signals; and

separately providing each of the demodulated color signals to the display device, such that the display device generates a display responsive to the demodulated color signals, wherein the display device is configured to input and respond to a display synchronization signal; and

using the display synchronization signal to synchronize said time division multiplexing.

2. A local area network system comprising:

means for generating each of the color signals at the computer system;

means for modulating each of the color signals onto a different set of video channels, each set of video channels including a plurality of video channels, said modulating including time division multiplexing each of the color signals between each of the video channels in the set corresponding to said color signal;

means for transmitting the modulated color signals from the computer system onto the broadband transmission medium at an end of the transmission medium corresponding to the computer system;

means for receiving the modulated color signals at an end of the broadband transmission medium corresponding to the display device;

means for demodulating each of the modulated color signals; and

means for separately providing each of the demodulated color signals to the display device, such that the display device generates a display responsive to the demodulated color signals, wherein the display device is configured to input and respond to a display synchronization signal; and

means for using the display synchronization signal to synchronize said time division multiplexing.