Previous studies of LCD glass strength have demonstrated that it is independent of glass thickness. Instead, it depends primarily on surface defects introduced in the glass during handling, processing and assembling of the LCD panel. This paper focuses on mechanical reliability of such a panel when mounted in the LCD module and subjected to static loading.
An important aspect of mechanical reliability of LCD panels is to understand and quantify their response to impact loading. This paper studies the behavior of 17″ modules impacted by a spherical ball traveling at a speed of up to ∼1 m/sec. At this velocity, the deformation response of the module system is significantly different from that during quasi‐static loading. In view of much shorter duration of impact test, the LCD panels can sustain relatively large loads without any measurable slow crack growth. The test data show that the dynamic strength of these panels, estimated from fracture mirror, is significantly higher than their quasi‐static strength. With higher strength and immeasurable slow crack growth the LCD panels should not experience cumulative damage during multiple impact loading implying that their mechanical reliability under such loading is excellent.
A computer simulation of the pressures and deformations of LCD glass sheets was developed using the finite element analysis (FEA) method. This model was used to predict the bulging of the sheets associated with the Gravity Mura optic defect. The importance of internal hydrostatic pressure in the LC fluid, stiffness of the spacers and glass sheet thickness were examined. The behavior of the model is nearly independent of glass thickness for values between 0.635 and 1.10 mm. All show the bulging starting at essentially the same internal pressure (0.92 atm.). Increasing the elastic stiffness of the spacers by a factor of 5 did not significantly impact the behavior of this model. The model is also sensitive to thermal expansion of the fluid.
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