Рубрика:
47
• The resolution would be tiny.
Thus, our initial plan was to develop a fabric comprising optical fibers for wefts
and silk in chain. Other natural, artificial or synthetic yarns could also have been used
to constitute the chain. Yarns were chosen for the chain with the aim of achieving
good flexibility in the fabric, fine titration and an improved capacity to diffuse and
reflect the light emitted by optical fibers for better legibility of information. Different
textile finishing methods are being tested -- either in pasting or in coating - to
guarantee grid stability and flame resistance and to enable optimal light emission
intensity and contrast.
Display matrix design
The screen for fabric displays comprises a number of surface units, or pixels;
each one can be illuminated by a light source emitted from one side of the fabric by
one or several PMMA optical fibers with discrete index variation. The pixels are
directly formed on optical fibers while transversely forming a spout of light on the
fabric. The process consists of generating micro-perforations that reach into the core
of the fiber. The remainder of the optical fiber, which did not receive any specific
processing, conveys the light without being visible on the surface.
Two processing techniques have been developed for optical fibers. The first is a
mechanical treatment by the projection of micro particles with different velocities on
the optical fiber's cladding. The second technique uses different chemical solvents to
make these micro perforations; this method seems to produce a better final result.
Finally, the chemically processed fiber obtained by a scanning electron microscope.
There are three methods that are used to light ON and OFF static patterns on
the fabric (texts, logos and scanned pictures), which we adapted to develop our own
technique. A basic fabric is used in the first method. The lighting zone to be
processed, which is composed of optical fibers, is delimited by a stencil key. The
picture remains static—with eventual color changes—but can offer quite a high
resolution.
In the second method, the zone to be lit is formed during weaving on a
Jacquard loom before being processed. The remaining, inactive fabric is composed of
the floating fibers on the back of the fabric.
A third method uses a two-layer adapted basic-velour fabric that makes optical
fibers as visible as possible, but with sufficient consistency of fabric structure. Prior
to the weaving process, the optical fibers are chemically treated, enabling the specific
dynamic lighting zones to be created.
We modified these techniques by creating specific weaving armor and an adapted
lighting control in order to generate variable information on the same fabric zone. We
developed a matrix that makes it possible to display a great deal of basic information,
such as texts, logos or other patterns, in a static or dynamic way.
Because a fabric display can only be produced by columns made of a single
optical fiber or group of fibers, we had to create lines artificially. Similar to the
process that would be used with two superimposed patterns to be lightened on the
same column, this involves alternating two consecutive weft fibers—one for the first
pattern, and the other for the second. Each is processed on a precise section in order
to re-emit light at a specific place.
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