Storage display system

Claim 2

Storage display apparatus comprising: a cathode ray tube (CRT) display having a video signal input, horizontal and vertical sweep inputs for controlling an electron beam deflection in response to signals applied thereto and having an intensity control input for adjusting the current in the electron beam to intensify the illumination of a portion of the display in response to a signal applied thereto; raster generator means having a first raster output connected to the horizontal sweep input of said CRT display for providing a horizontal sweep signal thereto and having a second raster output connected to the vertical sweep input of said CRT display for providing a vertical sweep signal thereto; scan converter means including an electron gun and electron beam deflection means having horizontal and vertical sweep inputs for controlling the defLection of an electron beam from the gun, a storage mesh, an output for producing a video signal and an erase input for changing the voltage on said storage mesh in response to a signal applied thereto; connecting means for connecting the first and second raster outputs to the horizontal and vertical sweep inputs of said scan converter deflection means; means connecting the output of said scan converter to the video signal input of said CRT display; comparator means having first, second, third and fourth control inputs, first and second raster inputs connected respectively to the first and second raster outputs, and an output, signals on the first and second control inputs establishing a first amplitude range and signals on the third and fourth control inputs establishing a second amplitude range, said comparator means producing first output signal in response to the signal amplitude on the first raster input being within the first amplitude range and the signal amplitude on the second raster input being within the second amplitude range, and producing a second output signal otherwise; and control means having a plurality of inputs, a first of said plurality of inputs being connected to the output of said comparator means, and having an output connected to the erase input of the scan converter means for providing a signal thereto in response to either (a) a first signal at another of said plurality of inputs and said first output signal at the first input, or (b) a second signal at another of said plurality of inputs and said second output signal at the first input, said control means including a second output connected to the intensity control input of the CRT display for providing a signal thereto in response to a signal at still another of said plurality of inputs and said first output signal at the first input.

Claim 3

Storage display apparatus comprising: a cathode ray tube (CRT) display having a video signal input, horizontal and vertical sweep inputs for controlling an electron beam deflection in response to signals applied thereto and having an intensity control input for adjusting the current in the electron beam to intensify the illumination of a portion of the display in response to a signal applied thereto; raster generator means having a first raster output connected to the horizontal sweep input of said CRT display for providing a horizontal sweep signal thereto and having a second raster output connected to the vertical sweep input of said CRT display for providing a vertical sweep signal thereto; scan converter means including an electron gun and electron beam deflection means having horizontal and vertical sweep inputs for controlling the deflection of an electron beam from the gun, a storage mesh, an output for producing a video signal and an erase input for changing the voltage on said storage mesh in response to a signal applied thereto; connecting means for connecting the first and second raster outputs to the horizontal and vertical sweep inputs of said scan converter deflection means, said connecting means including adder means having a first and second input connected to the first and second raster outputs and having a first output connected to the horizontal sweep input of said scan converter means for providing a signal thereto proportional to a signal at said first input and a selected amount of a signal at said second input and having a second output connected to the vertical sweep input of said scan converter means for providing a signal thereto proportional to a signal at said second input and a selected amount of a signal at said first input; means connecting the output of said scan converter to the video signal input of said CRT display; comparator means having first, second, third and fourth control inputs, first and second raster inputs connected respectively to the first and second raster outputs, and an output, signals on the first and second control inputs establishing a first amplitude range and signals on the third and fourth control inputs establishing a second amplitude range, said comparator means producing first output signal in response to the signal amplitude on the first raster input being within the first amplitude range and the signal amplitude on the second raster input being within the second amplitude range, and producing a second output signal otherwise; and control means having a plurality of inputs, a first of said plurality of inputs being connected to the output of said comparator means, and having an output connected to the erase input of the scan converter means for providing a signal thereto in response to either (a) a first signal at another of said plurality of inputs and said first output signal at the first input, or (b) a second signal at another of said plurality of inputs and said second output signal at the first input, said control means including a second output connected to the intensity control input of the CRT display for providing a signal thereto in response to a signal at still another of said plurality of inputs and said first output signal at the first input.

Claim 4

Storage display apparatus comprising: a cathode ray tube (CRT) display having a video signal input, horizontal and vertical sweep inputs for controlling an electron beam deflection in response to signals applied thereto and having an intensity control input for adjusting the current in the electron beam to intensify the illumination of a portion of the display in response to a signal applied thereto; raster generator means having a first raster output connected to the horizontal sweep input of said CRT display for providing a horizontal sweep signal thereto and having a second raster output connected to the vertical sweep input of said CRT display for providing a vertical sweep signal thereto; scan converter means including an electron gun and electron beam deflection means having horizontal and vertical sweep inputs for controlling the deflection of an electron beam from the gun, a storage mesh, an output for producing a video signal and an erase input for changing the voltage on said storage mesh in response to a signal applied thereto; connecting means for connecting the first and second raster outputs to the horizontal and vertical sweep inputs of said scan converter deflection means, said connecting means including adder means having a first and second input connected to the first and second raster outputs and having a first output connected to the horizontal sweep input of said scan converter means for providing a signal thereto proportional to a signal at said first input and a selected amount of a signal at said second input and having a second output connected to the vertical sweep input of said scan converter means for providing a signal thereto proportional to a signal at said second input and a selected amount of a signal at said first input; means connecting the output of said scan converter to the video signal input of said CRT display; comparator means having first, second, third and fourth control inputs, first and second raster inputs connected respectively to the first and second raster outputs, and an output, signals on the first and second control inputs establishing a first amplitude range and signals on the third and fourth control inputs establishing a second amplitude range, said comparator means producing first output signal in response to the signal amplitude on the first raster input being within the first amplitude range and the signal amplitude on the second raster input being within the second amplitude range, and producing a second output signal otherwise; and control means having a plurality of inputs, a first of said plurality of inputs being connected to the output of said comparator means, and having an output connected to the erase input of the scan converter means for providing a signal thereto in response to either (a) a first signal at another of said plurality of inputs and said first output signal at the first input, or (b) a second signal at another of said plurality of inputs and said second output signal at the first input, said control means including a second output connected to the intensity control input of the CRT display for providing a signal thereto in response to a signal at still another of said plurality of inputs and said first output signal at the first input.