Electronically switched field sequential color video display having parallel color inputs
First Claim
1. A video display system comprising:
- a cathode-ray tube having a light-emitting screen which is capable of emitting light representing two or more colors of the visible spectrum;
a plurality of electron guns disposed in the cathode ray tube for emitting a corresponding plurality of electron beams which impinge upon a corresponding plurality of portions of the light-emitting screen so as to cause the plurality of portions to emit light;
means for horizontally deflecting the plurality of electron beams across the entire width of the light-emitting screen for repetitively tracing a corresponding plurality of generally straight lines across the entire width of the light-emitting screen;
means for vertically deflecting the plurality of electron beams at approximately the time that the means for horizontally deflecting completes the tracing of the plurality of lines across the entire width of the light-emitting screen so as to substantially eliminate tilting of the plurality of lines on the light-emitting screen;
input means for receiving a plurality of parallel video signals each representing a different one of two or more colors of the visible spectrum; and
reformatting means, connected to the input means, for storing the video signals.
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Accused Products
Abstract
The invention uses a multiple beam cathode ray tube to write a television type raster, or frame, with the maximum data rate and writing speed reduced by a factor equal to the number of simultaneously operating beams. To overcome excessive slope in the picture, a stepped deflection is used such that the majority of vertical deflection occurs after a particular horizontal sweep is completed and before the successive sweep begins. The scanning speed is further increased by using an optical transmission filter capable of selectively transmitting separate colors emitted by the screen of the cathode ray tube wherein a portion of the filter may be set to transmit the next color in the color sequence while the remainder of the filter is transmitting the color presently displayed.
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Citations
13 Claims
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1. A video display system comprising:
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a cathode-ray tube having a light-emitting screen which is capable of emitting light representing two or more colors of the visible spectrum; a plurality of electron guns disposed in the cathode ray tube for emitting a corresponding plurality of electron beams which impinge upon a corresponding plurality of portions of the light-emitting screen so as to cause the plurality of portions to emit light; means for horizontally deflecting the plurality of electron beams across the entire width of the light-emitting screen for repetitively tracing a corresponding plurality of generally straight lines across the entire width of the light-emitting screen; means for vertically deflecting the plurality of electron beams at approximately the time that the means for horizontally deflecting completes the tracing of the plurality of lines across the entire width of the light-emitting screen so as to substantially eliminate tilting of the plurality of lines on the light-emitting screen; input means for receiving a plurality of parallel video signals each representing a different one of two or more colors of the visible spectrum; and reformatting means, connected to the input means, for storing the video signals. - View Dependent Claims (2, 3, 4, 5, 6)
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- 7. The video display system according to claim 21 wherein there are two each of the red, green and blue memories, one each of the red, green and blue memories forming a memory termed an odd field memory and storing red, green and blue video signals representing an odd field of an image, and the other red, green and blue memories forming a memory termed an even field memory and storing red, green and blue video signals representing an even field of the image.
- 9. The video display system according to claim 23 wherein the lines traced on the light-emitting screen by the electron guns in response to the portions of the video signals stored in the odd field memory are interleaved with the lines traced on the light-emitting screen by the electron guns in response to the portions of the video signals stored in the even field memory.
Specification