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
Variable month cross-platform photo calendar builder
Method and apparatus for executing load distributed printing
Process for the production of an acylation catalyst
Matching a usage history to a new cloud
Lens system
Modular storage system
Polymers
  Randomly Featured Patents
Optical scanning device and image forming apparatus using the same
Impatiens plant named `Imtrasa`
Ergonomic crutch
Stator core containing iron-aluminum alloy laminations and method of using
CRT focus control circuit
Composition and method to promote human hair growth
Bolt-nut fastening mechanism
Switch device and wiring structure therefor
Multiprotocol antenna structure and method for synthesizing a multiprotocol antenna pattern
Bookstand