[assembling method and device thereof]

An assembling device for mounting a second plate on a first plate, comprising:

• a first carrier plate having a first carrier area, wherein the first plate is disposed on the first carrier area;
• and
• a second carrier plate having a second air channel, a plurality of second openings, and a second carrier area, wherein the second carrier plate is pivoted to the first carrier plate and stacked over the first carrier plate, the second openings are disposed on the second carrier area and linked to the second air channel, the second plate covering the second openings is disposed on the second carrier area, and the second carrier plate or the first carrier plate has a third air channel and at least a third opening linked to the third air channel such that the corresponding second plate or first plate exposes the third opening.

An alignment jig for vacuum assembly, comprising:

• an air-evacuating device;
• and
• a sealed chamber connected to the air-evacuating device, wherein the sealed chamber comprising a first carrier plate, a second carrier plate, and a sealing ring, the first and the second carrier plate produces a sealed space through the sealing ring after evacuating the air inside, and the sealed chamber is suitable for assembling a pair of plates together at a pressure below the atmospheric.