Patent ID: 6034669
Filing Date: 2000-03-07
Classification: G05G,G06F

Abstract:
A joystick control device having cursor correcting function, comprising:a photoelectric transducer, connecting to the joystick for transforming the light signal corresponding to the movement of the joystick into an one-byte electric digital signal;a counter, connecting to said photoelectric transducer for transforming said digital signal coming from said photoelectric transducer into a bit sequence, wherein said bit sequence represents the movement of said joystick;a latch, having an initial value therein and connecting to a feedback signal and a control signal, and determining whether or not said feedback signal is inputted to replace the prior value in accordance with said control signal;an adder, receiving the output signals from said counter and said latch, adding said output signals, and outputting the result signal, said result signal being sent back to said latch; anda cursor position indicator, receiving said result signal from said adder, and adjusting the parameter which is used for determining the position of the cursor in accordance with said result signal,said initial value of said latch being used for centering the cursor on the screen when said joystick control device is first turned on, which is determined as follow: said cursor position indicator controlling the cursor to sit at the center of a screen when said initial value is directly inputted into said cursor position indicator; when proceeding the correcting function, said control signal of said latch controlling said feedback signal from said adder to be inputted into said latch for replacing the prior value therein; the value stored within said latch being replaced properly or being conserved till said joystick control device being turned off; the parameter drift of IC caused by manufacturing variation being corrected by shift correction of said joystick whenever said joystick control device is turned on, thereby ensures that the cursor sits at the center of a screen when said joystick is centered.