Stroke written shadow-mask multi-color CRT display system

• US 4,200,866 A
• Filed: 03/13/1978
• Issued: 04/29/1980
• Est. Priority Date: 03/13/1978
• Status: Expired due to Term

• Current Assignee: Rockwell International Corporation
• Original Assignee: Rockwell International Corporation
• Inventors: Strathman, Lyle R.
• Primary Examiner(s): Trafton, David L.
• Application Number:
  US05/885,843
• Time in Patent Office: 778 Days
• Field of Search: 340/324 A, 340/324 AD, 340/701, 340/703, 340/704, 315/367
• US Class Current: 345/22
• CPC Class Codes: G09G 1/10 the deflection signals being produced by essentially digital means, e.g. incrementally
• CPC Class Codes: G09G 1/28 using colour tubes tubes therefor H01J31/20

Abstract

A stroke writing generator develops selectively incremented and/or decremented horizontal and vertical deflection signals which simultaneously deflect all color associated beams of a conventional shadow-mask multi-color cathode ray tube to cause the beams to trace out a selected symbology on the tube screen. A video color code generator, operating in clock-defined synchronism with the stroke writing generator, selectively effects turn-on permutations of plural video amplifiers driving associated electron beams in the cathode ray tube to facilitate preprogrammed color tinting of the displayed symbology.

Claims

1. In combination:

a multi-color, shadow-mask cathode ray tube including means for generating plural electron beams;

a plurality of video amplifier means each associated with an individual one of said plural means for generating;

a stroke-writing deflection signal generating means, means for simultaneously controlling deflection of said plural electron beams in response to the output of said deflection signal generating means, and color code means operable in synchronism with said deflection signal generating means to effect selected turn-on permutations of said plurality of video amplifier means.

2. In a display system including a shadow-mask multi-color cathode ray tube, means for generating running digital counts respectively definitive of horizontal and vertical deflection signals to trace out a predetermined symbology on said cathode ray tube, means applying said deflection signals to respective horizontal and vertical deflection coils of said cathode ray tube, each of said running digital counts being selectively incremented and/or decremented at a clock defined rate, and means operable in synchronism with said clock defined bit rate so selectively effect turn-on permutations of respective video amplifiers driving associated electron beams in said cathode ray tube.

3. A display system as defined in claim 2, wherein said means for generating said deflection signal comprises means for storing binary deflection command words, and means for addressing selected sequences of said command words to develop said selectively incremented and/or decremented horizontal and vertical deflection signals;

and with said system comprising color code generating means responsive to said means for addressing to develop selected binary color code defining outputs to said video amplifiers.

4. The display system of claim 3, with said means for storing including means for storing color code defining digital command words at discrete addressable addresses, said means for addressing comprising means to effect readout of preselected ones of said color code command words during intervals defining selected pluralities of addressed ones of said deflection command words.

5. In combination;

a shadow-mask multi-color cathode ray tube having respective red, blue and green writing beam generation means each with an associated video amplifier, a stroke writing generator means to effect predetermined horizontal and vertical deflection increments of said cathode ray tube beams,

and means operable in synchronism with said stroke writing generator means to effect selected turn-on permutations of said associated red, green and blue video amplifiers during predefined beam deflection increment sequences as effected by said stroke writing generator means.

6. The combination of claim 5, with said stroke writing generator means comprising command logic signal generation means to effect cathode ray tube beam turn-off during predetermined beam deflection increment sequences, and logic gating means responsive to command logic signals to selectively preclude said turn-on pemutations of said video amplifiers.

7. The combination of claim 6 with said stroke writing generator means comprising means for addressing to effect a predetermined sequential readout of a stored first plurality of digital command words each having m-bits effecting incrementing and/or decrementing of horizontal and vertical deflection signals applied to said cathode ray tube, said sequential readout collectively effect writing of a predefined symbology on said cathode ray tube, and said means for addressing further efficiency readout of a stored second plurality of digital command word each having n-bits defining red, green, blue video amplifier turn-on permutations for that sequential readout, and said n-bit command words being applied to said logic gating means.

8. The combination of claim 7, with said sequences of m-bit words defining contiguous writing segments of a selected symbol to be displayed, said addressing means responsive to a symbol assigned address to effect sequential read-out from siad first storage means of said m-bit words defining that symbol and a readout of a selected one of said n-bit color definitive words to define a preselected display color for said symbology defining sequence.

9. The combination of claims 7 or 8 with said n-bit words comprising at least three bits respectfully definitive of turn-on of said red, green and blue video amplifiers.

10. The combination of claims 7 or 8 with said n-bit words comprising a plurlaity of bits for each of the colors, red, green, and blue, with the plurality of bits for each color being definitive of multi-level intensity turn-on of the associated one of said video amplifiers.

11. The combination of claim 10, with said plurality of bits for each of said colors applied to an associated digital-to-analog conversion means the output of which is applied to the video amplifier associated with that color.