Display device with vapor chamber housing phase-changeable working fluid

A display device comprising:

• a base having a first surface, and a second surface at an opposite side to the first surface;
• a reflective light modulator disposed on the first surface, and electrically coupled to the base;
• a drive circuit board having a third surface electrically coupled to the second surface, and a fourth surface at an opposite side to the third surface, and configured to drive the reflective light modulator;
• a vapor chamber having a heat receiver configured to receive heat transferred from an outside, a heat radiator configured to radiate heat, and a fluid housing chamber configured to house a working fluid which changes from a liquid phase to a vapor phase due to the heat received by the heat receiver, and changes from the vapor phase to the liquid phase in the heat radiator;
• and
• a heatsink coupled to the heat radiator in a thermally-transferable manner, wherein
• the heat receiver has a first area opposed to the second surface, and a second area opposed to the fourth surface, and
• the first area projects toward the base side from the second area,
• the first area has a coupling surface at the base side that is coupled to the second surface in a thermally-transferrable manner, the coupling surface being a flat surface,
• the vapor chamber has a plurality of columnar parts which are disposed in the fluid housing chamber, and which couple an inner surface corresponding to the heat receiver and an inner surface corresponding to the heat radiator to each other,
• the plurality of columnar parts are disposed in accordance with the second area, and
• the plurality of columnar parts are not disposed in accordance with the first area.