Color convergence data processing in a CRT color display station
First Claim
1. In a CRT information display system in which a CRT display station receives electrical convergence control signals from a control unit, effectively stores them and then allows the reading back of the stored convergence control signals, and in which a screen display RAM is provided for receiving and storing video character control signals which define a video character pattern to be visually displayed, the improvement comprising said display station including the combination of:
- a preconverged CRT on which a video character pattern is to be displayed,means for receiving and storing said electrical convergence control signals in predetermined storage locations in said display station while preventing said stored convergence control signals from controlling convergence of said CRT,means for receiving and storing said video character control signals in predetermined storage locations in said screen RAM, andmeans for providing a predetermined visually displayed character pattern on said CRT in accordance with said stored video character control signals in said screen RAM while effectively preventing said stored convergence control signals from controlling convergence of said CRT.
1 Assignment
0 Petitions
Accused Products
Abstract
A preconverged color display station is disclosed which is compatible with a computer controlled control unit that provides electrical convergence control signals. Compatibility is obtained by causing the control unit to transmit the electrical convergence signals to the screen storage memory RAM (random access memory) which normally stores information defining the character and character attributes to be visually provided by the display station CRT screen. The stored convergence signals are read back to the control unit from the screen RAM. After all of the convergence signals have been received by the display station and prior to the transmission of character and character attribute information signals to the screen RAM, the contents of the screen RAM is erased. Subsequently, the contents of the screen RAM, which now contains character display information signals, is read out and utilized to define a visual display on a CRT. During the time that the screen RAM contains electrical convergence signals, the video of the CRT is blanked. Selection of any of at least three basic colors is provided by the color display station whether or not electrical convergence control signals are provided thereto and whether or not a monochrome or multicolor control unit is coupled thereto.
32 Citations
16 Claims
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1. In a CRT information display system in which a CRT display station receives electrical convergence control signals from a control unit, effectively stores them and then allows the reading back of the stored convergence control signals, and in which a screen display RAM is provided for receiving and storing video character control signals which define a video character pattern to be visually displayed, the improvement comprising said display station including the combination of:
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a preconverged CRT on which a video character pattern is to be displayed, means for receiving and storing said electrical convergence control signals in predetermined storage locations in said display station while preventing said stored convergence control signals from controlling convergence of said CRT, means for receiving and storing said video character control signals in predetermined storage locations in said screen RAM, and means for providing a predetermined visually displayed character pattern on said CRT in accordance with said stored video character control signals in said screen RAM while effectively preventing said stored convergence control signals from controlling convergence of said CRT. - View Dependent Claims (2, 3)
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4. In a CRT information display system in which a CRT display station receives electrical convergence control signals from a control unit, effectively stores them and then allows the reading back of the stored convergence control signals, and in which a screen display RAM is provided for receiving and storing video character control signals which define a video character pattern to be visually displayed on a CRT, the improvement comprising the combination of:
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means for receiving and storing said electrical convergence control signals in predetermined storage locations in said screen display RAM while preventing said stored convergence control signals from effectively defining a visually displayed character pattern, means for subsequently effectively erasing said convergence control signals stored in said screen RAM and receiving and storing said video character control signals in said predetermined storage locations in said screen RAM, and means for providing a predetermined visually displayed character pattern on said CRT in accordance with said stored video character control signals. - View Dependent Claims (5, 6, 7, 8)
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9. In a method for CRT information displaying system in which a CRT display station receives electrical convergence control signals from a control unit, effectively stores them and then allows the reading back of the stored convergence control signals, and in which a screen display RAM is provided in said display station for receiving and storing video character control signals which define a video character pattern to be visually displayed, the improved method comprising the steps of:
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providing in said display station a preconverged CRT on which a video character pattern is to be displayed, receiving and storing said electrical convergence control signals in predetermined storage locations in said display station while preventing said stored convergence control signals from effectively controlling convergence of said CRT, subsequently receiving and storing said video character control signals in predetermined storage locations in said screen RAM, and providing a predetermined visually displayed character pattern on said CRT in accordance with said stored video character control signals in said screen RAM while effectively preventing said stored convergence control signals from controlling convergence of said CRT. - View Dependent Claims (10, 11)
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12. In a method for CRT information displaying in which a CRT display station receives electrical convergence control signals from a control unit, effectively stores them and then allows the reading back of the stored convergence control signals, and in which a screen display RAM is provided in said display station for receiving and storing video character control signals which define a video character pattern to be visually displayed on a CRT in said display station, the improved method comprising the steps of:
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receiving and storing said electrical convergence control signals in predetermined storage locations in said screen display RAM while preventing said stored convergence control signals from effectively defining a visually displayed character pattern, subsequently effectively erasing said convergence control signals stored in said screen RAM and receiving and storing said video character control signals in said predetermined storage locations in said screen RAM, and providing a predetermined visually displayed character pattern on said CRT in accordance with said stored video character control signals. - View Dependent Claims (13, 14, 15, 16)
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Specification