EP0192815A2
Expired / Lapsed
EP
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Tone control device in monochromatic tone display apparatus
Assignee: Toshiba Corp
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Filing: 1985-09-10
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Granted: —
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Expires: 2005-09-10
Abstract
Abstract In a tone control device in a monochromatic tone display apparatus, when an intensity signal and at least one of the R, G and B signals is active, an AND gate (17) generates a maximum tone level signal. A selector/adder having OR gates (13, 14, 15) and resistors (R13, R14, R15) receives the maximum tone level signal and the R, G and B signals. When the maximum tone level signal is inactive, the selector/adder generates a tone level signal in response to the active state of the R, G and B signals. When the maximum tone level signal is active and all the R, G and B signals are inactive, the selector/adder generates a minimum tone level voltage. However, when the maximum tone level signal and at least one of the R, G and B signals is active, the selector/adder generates a maximum tone level voltage.
Inventors
- 👤 Nobutaka C/O Patent Division Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 15:57
CPC Classifications
G; G09; G09G; G09G1/00; G09G5/00; G09G5/02; G09G5/028
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
155 words
A tone display control device, in a display apparatus, for producing a monochromatic tone display corresponding to red (R), green (G) and blue (B) signals, as well as to an intensity .(I) signal, in synchronism with a horizontal synchronizing (HSYNC) signal and a vertical sync (VSYNC) signal, upon reception of the HSYNC, VSYNC, R, G, B and I signals, characterized by comprising: first means (18, 13, 14, 15, R13, R14, R15) for generating different tone level voltages in response to combinations, given such that at least one of the R, G and B signals is active when the I signal is inactive; and ' second means (17, 13, 14, 15, VCC) for generating both a minimum tone level voltage when the I signal is active and all the R, G and B signals are inactive, and a maximum tone level voltage when one or a combination of the R, G and B signals is active.
Claim 2
Dependent Claim
155 words
A tone display control device, in a display apparatus, for producing a monochromatic tone display corresponding to red (R), green (G) and blue (B) signals, as well as to an intensity .(I) signal, in synchronism with a horizontal synchronizing (HSYNC) signal and a vertical sync (VSYNC) signal, upon reception of the HSYNC, VSYNC, R, G, B and I signals, characterized by comprising: first means (18, 13, 14, 15, R13, R14, R15) for generating different tone level voltages in response to combinations, given such that at least one of the R, G and B signals is active when the I signal is inactive; and ' second means (17, 13, 14, 15, VCC) for generating both a minimum tone level voltage when the I signal is active and all the R, G and B signals are inactive, and a maximum tone level voltage when one or a combination of the R, G and B signals is active.
Claim 3
Dependent Claim
111 words
A device according to claim 1, characterized in that said first means comprises: a first gate circuit (18) for receiving the R, G and B signals which are externally supplied thereto, and for producing a logical ORed signal of the R, G and B signals; second, third and fourth gate circuits (13, 14, 15) for ORing signals of the R, G and B signals, respectively, and an inactive I signal; and resistors (R13, R14, R15), each of which has one end connected to said second, third and fourth gate circuits (13, 14, 15), respectively, and the other end connected to the power source voltage, said resistors (R13, R14, R15).constituting an adder.
Claim 4
Dependent Claim
132 words
A device according to claim 1, characterized in that said second means comprises: a fifth gate circuit (17) for generating a maximum tone level signal when at least one of an R, G or B signal is active and the intensity signal is active; second, third and fourth gate circuits (13, 14, 15) for generating an active signal irrespective of logic states of the R, G and B signals when the maximum tone level signal is generated from said fifth gate circuit (17); and resistors (R13, R14, R15), each of which has one end connected to said second, third and fourth gate circuits (13, 14, 15), respectively, and the other end connected to the power source voltage, said resistors constituting an adder and being arranged to generate a maximum tone level voltage.
References Cited (Backward Citations)
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