Programmable LED driver
AssigneeInternational Business Machines Corporation
InventorRupert Ho
Life of this patent
Estimating the term…
Abstract
The present invention discloses a high speed programmable electronic current driver circuit for supplying a controlled modulated current to an LED comprising: a current driver operable over a selectable range of current levels for connection to an LED for supplying operating current to an LED; control means connected to the current driver to select the current level for operation of the current driver; transmission gating means connected to the current driver to gate high speed data signal pulses to the current driver to modulate the current of the current driver by the data signal pulses by gating the current of the current driver with the data signal pulses; whereby light output by the LED will be modulated by the data signal pulses at selectable current levels.
Claims17
A high speed programmable electronic current driver circuit for supplying a controlled modulated current to a LED comprising:
- a current driver operable over a selectable range of current levels for connection to an LED for supplying operating current to a LED;
- control means connected to said current driver to select the current level for operation of said current driver;
- transmission gating means connected to said current driver to gate high speed data signal pulses to said current driver to modulate the current of said current driver by said data signal pulses by gating the current of said current driver with said data signal pulses;
- whereby light output by said LED will be modulated by said data signal pulses at selectable current levels.
A high speed switchable electronic current driver comprising:
- a plurality of current mirrors connected in a series of stages with the output driver of one stage providing the input to the next;
- high speed switching means connected to the input of the first stage of said current mirrors to switch said first stage at high speed;
- whereby said current driver will be switched at high speed.
Dependencies are inferred from the claim text.