Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Hardware portrait mode support










Image Number 5 for United States Patent #6639603.

A display subsystem supports both normal mode and portrait mode displays. In normal mode, the scan starts at the upper left comer of the display. In portrait mode, the scan starts at the lower left comer of the display. The display subsystem includes a dual mapped display memory having a normal mode display area and a portrait mode display area. The portrait mode display area is defined by X-ofst.sub.(Virtual) and Y-ofst. X-ofst.sub.(Virtual) is a power of two that is greater than the real X-ofst supported by the display in portrait mode. Address requests from the CPU or software use high order bits to specify whether the address is in the normal or portrait mode display area. In addition, address requests to the portrait mode display area use the address space defined by X-ofst.sub.(Virtual) and Y-ofst. When the address request specifies the portrait mode display area, the address of the request is translated to account for the different mode of the display. Since X-ofst.sub.(Virtual) is a power of two, the X-coordinate of the display location specified by the address can be determined without a division operation, thereby allowing for fast address translation. Logic within the display subsystem rapidly translates the address and supports a range of Y-ofst values.








 
 
  Recently Added Patents
Micro controller, driving method thereof and display device using the same
Stewpot
Organizer
Protocols for high performance computing visualization, computational steering and forward progress
System and method for optimizing garbage collection in data storage
Method and system for explicit feedback with sounding packet for wireless local area networks (WLAN)
Unique identifier per chip for digital audio/video data encryption/decryption in personal video recorders
  Randomly Featured Patents
Process and appliance for conveying liquid or gaseous fluids
Controller for soldering iron
Cephem and cepham compounds
Anthracycline glycosides, use and compositions containing same
Adapter for connection to a power outlet
Tire tread
Trigger-type liquid sprayer
Method and apparatus for encoding control data in a video data system
Developing method
Acrylate compound, preparation process thereof and fungicide using the same