In contrast to sub-class Fulltext... Hierarchy... Expanded...H04N in which are classified display devices capable of representing continuous brightness value scales, the present sub-class is limited to devices using only a discrete number of brightness values, e.g. visible/non-visible. [3]
The visual effect may be produced by a luminescent screen scanned by an electron beam, directly by controlled light sources, by projection of light, from controlled light sources onto characters, symbols, or elements thereof drawn on a support, or by electric, magnetic, or acoustic control of the parameters of light rays from an independent source. [3]
the beam directly tracing characters, the information to be displayed controlling the deflection as a function of time in two spatial co-ordinates, e.g. according to a cartesian co-ordinate system [3]
G09G 1/10
· · ·
the deflection signals being produced by essentially digital means, e.g. incrementally [3]
G09G 1/12
· · ·
the deflection signals being produced by essentially analogue means [3]
G09G 1/14
· ·
the beam tracing a pattern independent of the information to be displayed, this latter determining the parts of the pattern rendered respectively visible and invisible [3]
G09G 1/16
· · ·
the pattern of rectangular co-ordinates extending over the whole area of the screen, i.e. television type raster [3]
G09G 1/18
· · ·
a small local pattern covering only a single character, and stepping to a position for the following character, e.g. in rectangular or polar co-ordinates, or in the form of a framed star [3]
by tracing or scanning a light beam on a screen [3]
G09G 3/04
·
for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments [3]
by control of light from an independent source [3]
G09G 3/18
· · ·
using liquid crystals [3]
G09G 3/20
·
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 [3]
G09G 3/22
· ·
using controlled light sources [3]
G09G 3/24
· · ·
using incandescent filaments [3]
G09G 3/26
· · · ·
to give the appearance of moving signs [3]
G09G 3/28
· · ·
using luminous gas-discharge panels, e.g. plasma [3]
G09G 3/30
· · ·
using electroluminescent panels [3]
G09G 3/32
· · · ·
semiconductive, e.g. diodes [3]
G09G 3/34
· ·
by control of light from an independent source [3]