Method and apparatus for grey level printing with amplitude and

Details Method and apparatus for grey level printing with amplitude and Method and apparatus for grey level printing with amplitude and

1989-12-18

1993-09-14

Fuller, Benjamin R.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346107R, 358298, G01D 1500, G01D 900, H04N 123

Patent

active

052453553

ABSTRACT:
An improved method and apparatus for grey level printing using linear arrays of LED's or the like are described. In one embodiment, a circuit is provided that includes a look-up table that compares for each pixel to be printed a time-changing count from a threshold counter with a multibit signal representing a grey level value. In accordance with the program in the look-up table, a two-bit signal is fed to the printhead and used to turn the LED on at an intensity level commensurate with the two-bit signal. This process is repeated many times to determine the "on" time or pulsewidth of the LED for that pixel. With each repetition, a new two-bit signal is generated to define intensity level. In another embodiment, the number of repetitions of this process are shown to be substantially reducible by using a vernier clocking scheme involving a clock signal having different frequencies.

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