The liquid crystal display device according to the present invention is a thin liquid crystal display device where it is easy to position the flexible printed circuit on which light emitting diodes are mounted. The multi-port semiconductor memory device comprises a shared memory area and a plurality of mailbox areas used for inter-processor communication. The charge-blocking unit is coupled to the voltage source and provides a reverse voltage to control the voltage source to remain at a zero potential when an electrostatic voltage is being generated. The additive is selected from fluorinated surfactants, ionic surfactants, and nonionic surfactants. Of four cutting edges of the insert which extend along the long insert sides in the longitudinal direction, in each case two cutting edges delimit the top surfaces of the insert at the edge, each cutting edge extending in a curve.