Method and circuit for generating gray scale in gaseous discharg

Details Method and circuit for generating gray scale in gaseous discharg Method and circuit for generating gray scale in gaseous discharg

1975-11-28

1977-01-11

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

315169TV, 340324M, H04N 566, H04N 310

Patent

active

040028283

ABSTRACT:
A method and circuit for obtaining gray scale in gas discharge display panels which uses only one discharge site per resolution element, does not require extensive electronic memory and provides a continuous, broad intensity range. A maintain voltage is applied to all elements of the matrix display panel which has a magnitude somewhat less than the lower limit of the bistable region in which gas discharge panels are normally operated. Thus, a site cannot be turned "on" in the normal sense of initiating a sequence of discharges which continues indefinitely. However, the application of a trigger voltage can initiate a sequence of discharges which continues for a substantial number of cycles before dying out. The number of cycles for which the discharge sequence persists depends on the magnitude and duration of the addressing trigger voltage. If the panel is operated in a refresh mode (the addressing pulses are applied repetitively), the average brightness of the light emitted may be controlled by varing the magnitude of the trigger pulse voltage to obtain a luminance range of more than 30 to one. This gray scale method may be used to address a matrix display panel with video information using a line-at-a-time addressing with red, green and blue phosphors.

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