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
Partial response decision feedback equalizer with distributed control
Microporous membranes and methods for producing and using such membranes
Crowd validated internet document witnessing system
Passive charge cord release system for an electric vehicle
Methods and apparatus for adapting network characteristics in telecommunications systems
System for determining movement properties of a guided vehicle
Substrate processing apparatus and display method of substrate processing apparatus
  Randomly Featured Patents
Wall connection
Electrode wrench
Solid pharmaceutical formulation containing lovastatin and simvastatin respectively, and its preparation
Blasting charge for a blast actuated high-voltage power switch
Leg exercise device
Method for producing a coil, in particular an ignition coil for a motor vehicle
Energy harvesting power sources for detecting target impact of a munition
Egg slicer
Combined compartmentalized paint cup and selector valve for spray guns