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A circuit is described for driving a print head which permits a limited number of constant current drivers to be shared among a large number of print electrodes.
English (United States)
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Constant Current Driver Multiplexing Scheme for Electrothermal Printing
A circuit is described for driving a print head which permits a limited number
of constant current drivers to be shared among a large number of print
In the circuit N different print groups share M constant current driver circuits 10. An M-bit data shift register 12 is provided, and each of the N groups of M bits
of data is shifted in turn into shift register 12. Each bit of the data in shift register
12 is coupled to control one of the constant current drivers 10. Each of the
constant current driver outputs is connected to the power supply terminal of a
driver circuit 14. So long as only one input to each of the driver circuit 14 chip
groups is active at any given time, essentially all the input current to the driver
chip group is directed to the one active input, thereby providing a means of
steering the constant current to any one of N outputs.
To ensure that only one input of each driver group is active at one time, the
driver group inputs 16 1-n are driven from the outputs 18 1-n of a 1 of N decoder
circuit 20, in which only one output at a time is active.
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