Abstract: A package substrate is provided, which includes: a body having opposite first and second surfaces, each having adjacent first and second regions defined thereon; first and second circuit layers formed on the first and second surfaces of the body, respectively; a first insulating layer formed on the first surface of the body and having a plurality of first openings formed in the first insulating layer and positioned in the first and second regions; and a second insulating layer formed on the second surface of the body and having a plurality of second openings formed in the second insulating layer and positioned in the second region. Further, at least a third opening is formed in the second insulating layer and positioned in the first region to reduce the volume of the second insulating layer, thereby facilitating even distribution of thermal stresses through the first and second insulating layers during thermal cycling and hence preventing warpage of the package substrate.

Abstract: A handheld device with tract input function, which allows a user to move the whole handheld device for generating input data for the handheld device itself. The handheld device includes a sensor disposed on the handheld device for detecting the movement of the handheld device to output a displacement signal; a micro-controller coupled to the sensor to generate a tract signal in response to the displacement signal; an identifier coupled to the micro-controller to identify the tract signal for outputting at least a corresponding symbol for the user to select as the input data; a display device disposed on the handheld device; and a memory for storing the input data. The display device displays at least the corresponding symbol for the user to select as the input data corresponding to a desired symbol.

Abstract: A handheld device with tract input function, which allows a user to move the handheld device for generating an input data. The handheld device includes a sensor disposed on the handheld device for detecting the movement of the handheld device to output a displacement signal; a micro-controller coupled to the sensor to generate a tract signal in response to the displacement signal; and a identifier coupled to the micro-controller to identify the tract signal for outputting a corresponding symbol as the input data.