According to an aspect, a head-mounted display includes a front surface portion, a first side surface portion, a second side surface portion, a display unit, a display control unit, a first component unit, and a second component unit. The pivot joint adaptor includes a lower adaptor comprising a lower pivot member defining a first central wiring passage and an upper adaptor comprising an upper pivot member defining a second central wiring passage communicating with the first central wiring passage. This guide grid comprises a plurality of vanes of predetermined width in a vane space of about the same width. The comparator outputs a comparison signal by comparing voltages of the test node and the reference node. By editing, sending and reviewing the iWiTTY program clips people get to be in charge of what comes out of TV. The first pad group is arranged along a first side of the integrated circuit device, wherein the second pad group is arranged along a third side facing the first side, and wherein the third pad group is arranged along a second side which intersects with the first side and the third side.