Apparatus and method for updating a remote video display from a host computer
US5136695A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1989 |
| Grant date | Aug 4, 1992 |
| Priority date | — |
| Expiry date | Nov 13, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/1415
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Apparatus and a method are disclosed for reducing the transmission power required when a host computer displays video information on a remote video display. A video memory is located in close proximity to the display so that the display can be periodically refreshed in the normal manner from the local memory. Consequently, the host computer need only transmit information regarding the portions of the local memory that have changed since the last data transmission. Since the information for the entire local memory is not transmitted each time the memory must be updated and in particular, each time the display must be refreshed, the required data transmission rate between the host and the display is greatly reduced from the rate normally required with prior art apparatus and, consequently, the power consumption is reduced. In addition, a data and command multiplexing scheme is used to minimize the number of data communication lines which must be used between the transmitting and receiving devices, thus further reducing the power consumed during data transmission.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.