Logic circuit for expansion of monochrome display patterns to color form and video controller comprising such logic circuit

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(11)

EP 0 269 174 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	18.10.1989 Bulletin 1989/42

(43)	Date of publication A2:
	01.06.1988 Bulletin 1988/22

(21)	Application number: 87202226.4

(22)	Date of filing: 16.11.1987

(51)	International Patent Classification (IPC)⁴: G09G 1/28

(84)	Designated Contracting States:
	DE FR GB IT SE

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Priority:

17.11.1986 US 931760

(71)	Applicant: Philips Electronics N.V.
	5621 BA Eindhoven (NL)

(72)	Inventors:
	Mac Kenna,Craig Alden NL-5656 AA Eindhoven (NL) Li, Jan-Kwei Jack NL-5656 AA Eindhoven (NL)

(74)	Representative: Strijland, Wilfred et al
	INTERNATIONAAL OCTROOIBUREAU B.V., Prof. Holstlaan 6 5656 AA Eindhoven 5656 AA Eindhoven (NL)

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References cited: :

(54)	Logic circuit for expansion of monochrome display patterns to color form and video controller comprising such logic circuit

(57) A circuit which expands monochrome image-character patterns to color form for use in a raster scanned computer display system. Monochrome patterns are expanded from one bit per pixel to n bits per pixel. Foreground and background colors are programmable in a pattern generator which uses data from the expanded source patterns to select appropriate colors and characters for a destination pattern to be displayed. The expanded multicolor image is generated by hardware.

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