Resources Contact Us Home
Bit-mapped on-screen-display device for a television receiver

Image Number 4 for United States Patent #5640502.

In order to increase the speed of the transfer of control data to an OSD circuit, and to eliminate "holes" in memory caused by the use of memory mapped registers, dual use is made of the serial data port of the OSD circuit to accomplish two distinct tasks, serial transfer of graphics data and serial transfer of the control data. The on-screen display apparatus includes an OSD circuit for generating an graphics signal for display on a display screen, a controller coupled to the OSD circuit, for controlling the OSD circuit, and a VRAM including a first area for storing graphics data and a second area for storing control data for the OSD circuit. The VRAM has a parallel input/output port coupled to the controller and a serial output port coupled to the OSD circuit, the serial output port conveys the graphics data from the first area of the VRAM to the OSD circuit for processing and display. The controller writes the control data to the second area of the VRAM via the input/output port and the OSD circuit reads the control data from the VRAM via the serial output port during each vertical sync interval.

  Recently Added Patents
Network attachment for IMS systems for legacy CS UE with home node B access
Health monitoring of applications in a guest partition
Damage resistant antenna
Method and device for managing devices in device management system
Circuit design approximation
Hydrogen generation device and fuel cell system
Communication system including relay station and data frame for the communication system
  Randomly Featured Patents
Ringer circuit
Portable automated confocal microscope
Self sealing dispenser pack for pre-moistened towelettes
Post singulation die separation apparatus and method for bulk feeding operation
Resolving multiple master node conflict in a DDB
Method and apparatus for detecting surface defects in a workpiece
Automatic head for a line trimmer
System for displaying computer generated images on a television set
Priority interrupt circuit