Abstract
The ring-on-ring test is one of the most popular surface strength testing
methods used to test LCD panels. This paper uses finite element analysis to
show that a panel behaves like two independent pieces of glass during a ring-on-ring
test. The epoxy region where the color filter and thin-film transistor (TFT)
glasses are glued together does not affect the stress at the center. As LCD
panels get thinner, the contribution of membrane stress increases significantly.
Because the color filter and TFT glasses act independently, they experience
maximum principal stresses within 15% of each other. For deflections greater
than one-half (sometimes one-fourth) the glass thickness, the stresses are
not uniform inside the load ring, requiring finite element analysis to obtain
an accurate stress distribution.
© 2013 IEEE
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