Systems, methods, and devices for preventing shoot-through current within and between signal line drivers of semiconductor devices
View Patent ↗An imaging device driver for transmitting a signal onto a signal line for controlling transistors of a pixel row. The device includes a controller and associated circuitry for reducing shoot-through current within and between row driver circuits for driving the signal line. The controller reduces shoot-through current by preventing concurrent transmission of high and low signal outputs to the signal line by respective high and low voltage sources of the same or different row driver circuits.
1. A method of operating an imaging device, comprising:
during a first driving state of a first signal line, supplying a first signal from a first signal output to a plurality of pixel cells via said first signal line;
during a second driving state of said first signal line, supplying a second signal from a second signal output to said plurality of pixel cells via said first signal line, said first signal having a different voltage than said second signal;
during a third driving state of said first signal line, transmitting neither said first nor said second signal to said first signal line;
transmitting a control signal from a controller, said control signal causing an isolation device to block said supplying of said second signal from said second signal output to said plurality of pixel cells for a time period starting before and ending after a time t when said supplying of said first signal from said first signal output to said first signal line is started; and
interposing said third driving state between said first and second driving states based on said control signal.
2. The method of claim 1 , wherein said first signal has a greater voltage than said second signal.
3. The method of claim 1 , further comprising:
supplying a clock signal to said controller; and
starting said time period at least one clock cycle of said clock signal before said time t.
4. The method of claim 1 , further comprising:
supplying said first signal from a third signal output to said first signal line; and
supplying said second signal from a fourth signal output to said first signal line, wherein said first isolation device is arranged in series between said second and third signal outputs.
5. The method of claim 4 , further comprising:
transmitting said control signal or another control signal from said controller, said control signal causing a second isolation device to block said supplying of said second signal from said fourth signal output to said plurality of pixel cells for said time period starting before and ending after said time t.
6. The method of claim 1 , wherein said first isolation device is arranged on said first signal line.
7. The method of claim 6 , wherein said first isolation device is arranged in series between a pair of said plurality of pixel cells.
8. The method of claim 1 , wherein said first isolation device is arranged in series between said first signal output and said first signal line.
9. The method of claim 1 , wherein said first isolation device is arranged in series between said second signal output and a common node connecting said first and second signal outputs.
10. The method of claim 1 , wherein said first isolation device is arranged in series between said plurality of pixel cells and a common node connecting said first and second signal outputs, a second isolation device is arranged in series between said plurality of pixel cells and a common node connecting a third and fourth signal outputs.
11. The method of claim 10 , wherein said controller switches on said first and second transistors at the same time and switches off said first and second transistors at the same time.
12. The method of claim 1 , wherein said first signal line is connected to a respective one of charge transfer, reset, or row select transistors for reading out pixel cell signals of said plurality of pixel cells.
13. The method of claim 12 , wherein said control signal is transmitted when switching on or off said respective one of said charge transfer, reset, or row select transistors.