The structure of flat
resistive touch screen is illuminated as the following : on the top is polyester
film with hardcoat protection and ITO conductive coating below; on the medium
are separation dots; rounded by adhesive; on the lower is glass with ITO conductive
coating. Lead-out pins can be drawn from glass or film.
 I. Design of
Digital Matrix Touch Screen:
1. choosing number
of lines and columns;
2. determining the
resistance of the largest circuit; such value is mainly subjected to bar shape
structure; 3. determining the
viewing area and outline size;
4. choosing the mode
of drawing lead-out pin. The working principle
of digital matrix touch panel, namely transparent switch screen, is that when
touch point is pressured, the film will be deformed consequently so that the upper
and lower ITO conductive coating will be contacted to give off display signals.
II. Scheme of Analog
Resistive Touch Screen
Generally small size
one is four-wire resistive type. The working principle is that when contact point
is pressured, the upper and lower ITO circuits will connected consequently so
that voltage analogue signals coming from two terminals can be converted into
digital signals. According to the features of linear resistance on touch point,
the reverent location can be got by calculation and press the point to give a
display.
Digital matrex
panels are mainly applied to those displays operated by various buttons while
analog screens are applied to those displays operated by handwriting. Display
can be liquid crystal etc.
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