Display refresh memory apparatus utilizing one half frame updating
October 8, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesVideo processing system Video overlay system having interactive color addressing Horizontal and vertical image inversion circuit for a video display Progressive scan television receiver with adaptive memory addressing Field number conversion circuit Arrangement for processing data in digital fluorographic systems Raster display generator for hybrid display system Scanning conversion method and scan converter unit employing the conversion method Patent #: 4658293 InventorsAssigneeApplicationNo. 06/916580 filed on 10/08/1986US Classes:348/458, Changing number of lines for standard conversion345/539, Double buffered348/705SwitchingExaminersPrimary: Britton, Howard W.Attorney, Agent or FirmInternational ClassesG09G 5/36 (20060101)G09G 5/39 (20060101) AbstractRefresh memory apparatus for use in a CRT raster display system utilizes half field storage memories for ping ponging between updating and readout. In one TV mode of operation the even and odd raster lines are stored in the respective memories and in another TV mode the top and bottom halves of the frame are stored therein. The most significant bit and least significant bit of the vertical address signals are multiplexed to control the ping pong reading and writing of the memories and are multiplexed with the remainder of the address signal to provide the read and write addresses for the memories. The multiplexers are controlled in accordance with the TV mode in which the system is operating. | |
