Circuit for generating a scroll window signal in digital image a

Details Circuit for generating a scroll window signal in digital image a Circuit for generating a scroll window signal in digital image a

1989-06-15

1992-05-26

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340814, G09G 106

Patent

active

051172267

ABSTRACT:
A circuit for generating a scroll screen window signal which is capable of displaying on a display device a desired scroll screen by separating vertically, the screen being displayed in a given corresponding scroll mode. The circuit also compares scroll screen mode signals for discriminating a given mode by use of (+), (-) key input signal representing a scroll type. The improved invention comprises: an OR gate for receiving a basic clock signal 3.58 MHz; a first counter CNT1 and a second counter CNT2 for receiving a synchronous signal from a synchronized-divider and receiving an output of the OR gate; a first AND gate and a second AND gate for receiving a right/left scroll window selecting signal generated by a user; a third counter CNT3 for receiving a scroll window selecting signal from a fifth input terminal and generating a scroll window setting signal; a plurality of exclusive OR gates and a NOR gate for receiving outputs counted from the second counter and third counter, comparing the outputs, performing a logical operation upon them, and generating a scroll window signal to be applied to the OR gate; and a first NAND gate and a second NAND gate for receiving the output of the second counter after inverting outputs of the second counter in a given manner.

REFERENCES:
patent: 4199790 (1980-04-01), Greenfield et al.
patent: 4605967 (1986-08-01), Pires

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