Eastman-kodak Company

Carl Michael Petruzelli

Paul John Fleming

Michael William Mattern

Michael John Donahue

Tracy Fox

Edward Michael Kelly

A driver chip for use in an LED or other multi-element recording printhead includes a plurality of current driver channels. Data for determining recording durations for each of the current driver channels is provided on a data bus. A token bit is shifted through a shift register in association with image data to be latched by registers corresponding to a specific driver channel. The driver chip is operational in different recording resolution modes so that it may be connected to recording arrays of different resolutions. When operational in other than its highest or higher resolution, a by-pass signal is generated causing the token bit to by-pass certain stages of the shift register.

Driver IC configurable for recording in multiple resolutions printhead

A non-impact printhead having a plurality of driver IC chips and and a plurality of recording elements such as LEDs. Each driver IC chip includes a plurality of current-carrying channels that are operative for carrying current to respective recording elements on the printhead and a control for controlling operation of the driver. The control includes a circuit that provides a test circuit interface which includes (a) a test access port for input of update command signals and clock inputs to the test circuit; (b) a test data input terminal for inputting test data and control data into the chip; (c) a plurality of registers connected to the test data input terminal with at least one of the registers storing control data for controlling operation of the driver; (d) a test data output terminal for outputting test data and control data from the chip to an adjacent chip; and (e) a selector connected to the registers and the test data output terminal for selecting test and control data for output from the test data output terminal.

Led printhead and driver chip for use therewith having boundary scan

In an LED printhead or the like, a plurality of LED arrays are arranged in a row. Opposite the LED arrays are driver IC chips providing current in respective current driving channels to respective LEDS. Current to an LED for recording of a pixel will be provided for say a duration related to a multibit image data signal. A data bus is provided for carrying the data signals. The data signals are latched in respective data registers associated with each current driving channel. A token bit shift register is provided for identifying a respective data register for latching of the multibit image data signal presently on the data bus. A direction of shifting of the token bit is determined through automatic self-sensing of the token bit itself as the token bit is moved from a boundary scan register that forms a part of a boundary scan test architecture.

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Fairport, NY, United States of America

Carl Michael Petruzelli