Abstract
By way of experiments and ray tracing simulations, we investigate
the angular dependence of moiré fringes induced by metal grids
of various shapes (e.g., rectangular, square, hexagonal, and random
metal grids) for touch screen panels (TSPs). To quantify the moiré
phenomenon, we have utilized the standard deviation (SD) calculated
from the simulated ray distribution. The SD value is significantly
decreased (i.e., the moiré phenomenon is substantially suppressed)
with the rectangular and square metal grids when the crossing angle
between the metal grid and a black matrix (BM) of display panels lies
within the range between 20
$^{\circ}$
and 60
$^{\circ}$
.
For the hexagonal metal grid, there appears a sharp dip corresponding
to the minimum SD value every 30
$^{\circ}$
rotation angle. However,
the SD value is observed to be very high near the crossing angles
at which a sharp dip occurs. Though no angular dependence arises and
no moiré patterns appear with the random metal grid, yet the
SD value is even higher due to point defects, compared with the rectangular
and square metal grids. These results are in qualitatively good agreement
with the experiment results observed with the naked eye.
© 2014 IEEE
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