Resources Contact Us Home
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
Heat dissipation module and projection apparatus
Ice bin assembly
Transactions associated with a mobile device
Zippered bed skirt
Oxidizing aqueous dispersion for treating keratin fibers comprising at least one nonionic amphiphilic hydrophobic compound
Evaporated fuel treatment apparatus
Accelerated data uploading
  Randomly Featured Patents
Ski-binding support
Optical fiber coupling connector
Toe kick end cap for cabinets
User feedback engine
Depressurized tethered tennis ball training device
Glass sheet handling apparatus
4,5-dihydro-6-(substituted)phenyl-5-methyl-3-(2H)-pyridazinones and pharmaceutical compositions containing the compounds as active components
Closure for a container
Method for assuring device access to a bus having a fixed priority arbitration scheme
Ultra-wideband detector systems for detecting moisture in building walls