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

Image Number 5 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
Large carrying case
Multipoint photonic doppler velocimetry using optical lens elements
Mixture, especially spinning solution
Monitoring heap in real-time by a mobile agent to assess performance of virtual machine
Method and a system for registering a 3D pre-acquired image coordinates system with a medical positioning system coordinate system and with a 2D image coordinate system
Cellulose derivative and hydrogel thereof
  Randomly Featured Patents
Vertical type roller mill
Ceramic bullet-proof fabric
Method and apparatus for skin color correction and digital photographing apparatus using both
Flexure elastomer antenna isolation system
Polysulfide production in white liquor
Remote management of aircraft computer systems
Light flashing system
Signal selector and combiner system for broadband content distribution
Compositions and methods for biodetection by nucleic acid-templated chemistry
Hydraulic elevator