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
Buried object detection in GPR images
Method and apparatus for providing auto-completion of information
Preparation process of transition metal boride and uses thereof
Sliding-type portable communication device
Flexible quantization
Data-conditioned encryption method
System and method for advertising messages on distributed document processing devices
  Randomly Featured Patents
Sustained release preparations
Plug-in rechargeable battery and socket therefor
System and method for storing performance-enhancing data in memory space freed by data compression
Tool transport container apparatus
Motor vehicle instrument panel having a trim strip extending horizontally over it
Diving fishing lures
Device for quantitative analysis of micro-volume solution
Soft magnetic film, and thin film magnetic head, planer magnetic element, and filter using the soft magnetic film
Apparatus for backfilling and tamping a trench
Lubricating oil supply device for transmission mechanism