Abstract: A hard disk includes a first cover member including a first cover plate and a pair of first lateral walls extended from edges of thereof, each of the first lateral wall is formed with a support piece and a latch hook respectively protruded towards inward, the support piece and the latch hook are not arranged at same horizontal level in a direction perpendicular to the first cover plate; a second cover member, disposed at the outer side of the first cover member and engaged with the first cover member; and a storage module, accommodated inside the first cover member and including a circuit board having edges thereof clamped between distal ends of the latch hooks and the support pieces. Accordingly, the assembly can be easily achieved through fastening the storage module in the first cover member then sleeving the first cover member and the second cover member.

Abstract: A display apparatus includes a liquid crystal display (LCD) panel, a source driver, a gate driver and a timing controller. The LCD panel includes a main scan line, a sub scan line, a first pixel and a second pixel. The timing controller controls the gate driver to alternately output a main scan signal and a sub scan signal within every frame time. A time difference between the main scan signal and adjacent the sub scan signal is a delay time value. The main scan signal controls the first pixel to be written with a first polarity data and the second pixel to be written with a second polarity data. The frame times include at least two different delay time values.