Abstract: A display device including: a substrate; a first thin film transistor of polysilicon semiconductor, a second thin film transistor of oxide semiconductor; a first light shading film opposing to the polysilicon semiconductor, and a second light shading film opposing to the oxide semiconductor; a first insulating film, a second insulating film which is constituted from plural insulating films, and a third insulating film superposed in this order; a first through hole penetrating the second insulating film and not penetrating the first insulating film and the third insulating film; a second through hole penetrating the first insulating film and the third insulating film; the first light shading film connects with a first conductive component, a part of the first conductive component exists on the third insulating film, through the second through hole.

Abstract: An enclosed switchboard includes a stationary contact connected to a load, and a drawout type circuit breaker including a movable contact and movable between a connected position in which the movable contact is in engagement with the stationary contact and a disconnected position in which the movable contact is out of engagement with the stationary contact. The enclosed switchboard is provided with a test contact member which is arranged to engage with the stationary contact when the circuit breaker is drawn out. A plug socket connected to the test contact member is mounted on the switchboard at readily accessible position thereof for connecting an insulation tester.