An on-object user interface for presenting information and controls to a user in response to an automatic action performed by an application program. The heatsink module includes a first heat-conducting plate, a second heat-conducting plate, a fixing member, a heat pipe, and a pressing flat spring. The grooves are sized and arranged such that when the needle-like structures are received therein, the needle-like structures are aligned. The soft member is formed at the set cover, and closely contacted to the side of the display panel.