by control of light from an independent source

Introduced: January 1980

Full Title

Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes > for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix > by control of light from an independent source

CPC subdivides this area 3x more granularly than IPC with 4 additional codes.

4 codes are CPC-only extensions.

IPC defines codes here since 1980.

Child Classifications

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G09G 3/3406 +2 CPC CPC only CPC only
G09G 3/3433 +6 CPC CPC only CPC only
G09G 3/3486 CPC only CPC only
G09G 3/3493 CPC only CPC only
G09G 3/36 using liquid crystals since 1980 +3 CPC IPC+CPC Available in IPC and CPC
G09G 3/38 using electrochromic devices since 1990 IPC+CPC Available in IPC and CPC