Twinkle effect display system in which information is modulated at a rate within the flicker frequency of the human eye

Claim 2

A twinkle effect display system including in combination: a display device having video input means and having horizontal and vertical sweep inputs; first and second video signal sources having video signal outputs; timing signal generating means coupled to the horizontal and vertical sweep inputs of said display device for controlling the horizontal and vertical sweeps thereof at a cyclic rate; means coupling the video signal output of said first video signal source to the video input means of said display device; means including modulation means for coupling the video signal output of said second video signal source to the video input means of said display device, said modulation means including a frequency divider connected to said timing signal generating means to modulate the amplitude of signals coupled from the video signal output of said second video signal source to the video input means of said display device at a frequency which is a sub-multiple of said cyclic rate and which is within the useable flicker frequency band of the human eye.

Claim 3

A twinkle effect display system including in combination: a display device having a video input and having horizontal and vertical sweep inputs; first and second video signal sources having read-out control inputs and video signal outputs; means coupling the video signal output of said first video signal source to the video input means of said display device; means including modulation means for coupling the video signal output of said second video signal source to the video input means of said display device, said modulation means including an input to receive timing signals and responsive to timing signals received thereat to modulate the amplitude of signals coupled from the video signal output of said second video signal source to the video input means of said display device at a frequency within the useable flicker frequency band of the human eye; and timing signal generating means coupled to the readout control inputs of said video signal sources, to the horizontal and vertical sweep inputs of said display device, and to the timing signal input of said modulation means, thereby to synchronize The modulation of said second video signal source output and the sweep of said display device with the readout of said video signal sources.

Claim 4

A twinkle effect display system including in combination: a display device having a video input and having horizontal and vertical sweep inputs; first and second video signal sources having read-out control inputs and video signal outputs; means coupling the video signal output of said first video signal source to the video input means of said display device; means including modulation means for coupling the video signal output of said second video signal source to the video input means of said display device, said modulation means including an input to receive timing signals and responsive to timing signals received thereat to modulate the amplitude of signals coupled from the video signal output of said second video signal source to the video input means of said display device at a frequency within the useable flicker frequency band of the human eye; and timing signal generating means coupled to the readout control inputs of said video signal sources, to the horizontal and vertical sweep inputs of said display device, and to the timing signal input of said modulation means, thereby to synchronize The modulation of said second video signal source output and the sweep of said display device with the readout of said video signal sources.

Claim 5

A twinkle effect display system including in combination: a display device having video input means; first and second video signal sources having video signal outputs; means coupling the video signal output of said first video signal source to the video input means of said display device; and means including variable modulation means for coupling the video signal output of said second video signal source to the video input means of said display device and for modulating the amplitude of signals coupled from the video signal output of said second video signal source to the video input means of said display device at a frequency within the useable flicker frequency band of the human eye, said modulation means including adjustable means to vary, in accordance with the adjustment thereof, the minimum amplitude of video signals coupled from said second video signal source to the video input means of said display device, thereby to vary the index of amplitude modulation provided by said modulation means.

Claim 6

A twinkle effect display system including in combination: a display device having video input means; first and second video signal sources having video signal outputs; means coupling the video signal output of said first video signal source to the video input means of said display device; and means including variable modulation means for coupling the video signal output of said second video signal source to the video input means of said display device and for modulating the amplitude of signals coupled from the video signal output of said second video signal source to the video input means of said display device at a frequency within the useable flicker frequency band of the human eye, said modulation means including adjustable means to vary, in accordance with the adjustment thereof, the minimum amplitude of video signals coupled from said second video signal source to the video input means of said display device, thereby to vary the index of amplitude modulation provided by said modulation means.