Abstract: A backlight module is provided and includes a side wall, a cushion member, and a light guide plate. The cushion member has a base portion and a side portion extending from the base portion, and the side portion abuts against the side wall, and the light guide plate is mounted on the cushion member. A display device is provided and includes the aforementioned backlight module, using the cushion member to support the light guide plate.

Abstract: The present invention discloses a composite polarization type piezoelectric actuator comprising a ceramic element having a first polarizing region and a second polarizing region, wherein the first polarizing region has a first polarizing direction different from a second polarizing direction of the second polarizing region. When a voltage is applied to the composite polarization type piezoelectric actuator, an end face of the ceramic element is deformed. When a pulse wave voltage is applied to the composite polarization type piezoelectric actuator, the end face of the ceramic element generates an elliptical motion.