摘要:
A thermal expansion coefficient of a module substrate 8 is different from that of a package substrate. There is not any place where stresses generated in Interfaces between soldering balls 5 and the substrate are released. These stresses are largely applied to soldering bond, the soldering balls are strained, deformed, or cracked, and there has been a problem in long-time reliability. Slits are disposed on opposite sides of each soldering ball in a vertical direction to a side in an outer peripheral side of the package substrate, accordingly the stresses applied to the soldering balls are weakened, and the soldering balls are prevented from being strained, deformed, or cracked. When soldering strains are reduced in this manner, there can be provided a surface mounting type semiconductor package and system module having high reliability, low cost, and satisfactory electric characteristics such as low capacitance and low inductance.
摘要:
A semiconductor unit constituting a memory device has a memory chip, a package substrate having three wiring layers. Power-supply surfaces (VDD surface) and (GND surface) are wired on the package substrate while an intra-package DQ bus is wired on an intermediate layer between both of the power-supply surfaces. The memory device has two DQ pins every one intra-package DQ bus. The intra-package DQ bus is connected to a signal terminal pad of the memory chip through a via hole. In view of the two DW pins, a via hole for connecting the intra-package DQ bus with the signal terminal pad constitutes a branch wire.
摘要:
It is an object of an invention disclosed in the present specification to provide a transistor having low contact resistance. In the transistor, a semiconductor film including an impurity element imparting P-type or N-type conductivity, an insulating film formed thereover, and an electrode or a wiring that is electrically connected to the semiconductor film through a contact hole formed at least in the insulating film are included; the semiconductor film has a first range of a concentration of the impurity element (1×1020/cm3 or less) that is included in a deeper region than predetermined depth, and a second range of a concentration of the impurity element (more than 1×1020/cm3) that is included in a shallower region than the predetermined depth; and a deeper region than a portion in contact with the electrode or the wiring in the semiconductor film is in the first range of the concentration of the impurity element.
摘要:
A golf ball provided with elliptical dimples. A golf ball provided with non-circular dimples, configured by forming the dimples in the surface of a sphere or of a pseudosphere which consists of a polyhedron. The dimples have a non-circular shape which has a major axis having a length at least 1.2 times greater than that of the minor axis of the shape, are each composed of a pair of circular arcs, and have a depth which causes the peripheral edges of the dimples to generate turbulence. The configuration reduces the separation width at the separation boundary to a level less than that of a golf ball having circular dimples, and this decreases the drag. The polyhedron can be substantially composed of triangles, pentagons, or hexagons.
摘要:
A liquid crystal display device is provided, which may reduce flicker in all display gray levels. The liquid crystal display device includes a scan line drive circuit, a signal line drive circuit and a common connection line drive circuit. The common connection line drive circuit applies a voltage, the voltage having polarity opposite to polarity of the signal line, to a common connection line corresponding to a liquid crystal element as a selection object in a write period for writing into the liquid crystal element as a selection object, and applies one or multiple voltages, each voltage having a value different from a center value between an upper limit value and a lower limit value of voltages applied to the common connection lines in the write period, to the common connection lines in a holding period after writing into the liquid crystal element as a selection object is performed.
摘要:
The present invention provides a liquid crystal display device including: a pixel array including a plurality of scanning lines arranged in rows, a plurality of signal lines arranged in columns, a plurality of liquid crystal elements arranged in a matrix corresponding to an intersection of each scanning line and each signal line, and a plurality of common connection lines arranged one by one corresponding to the liquid crystal elements of each line; a scanning line drive circuit; a signal line drive circuit; and a common connection line drive circuit electrically separating, from each other, one or a plurality of common connection lines (first common connection lines), and a plurality of common connection lines (second common connection lines), and electrically connecting the plurality of second common connection lines to each other to independently drive the first common connection line and the second connection lines from each other.
摘要:
The irregularities of characteristics of a pair of transistors, which are prepared by a pseudo single crystallizing technique, are reduced. To achieve this, semiconductor layers are formed on a substrate and have pseudo single crystal regions therein, and a plurality of thin film transistors are arranged inside the pseudo single crystal regions. Two or more of the plurality of thin film transistors, which are required to exhibit small irregularities relative to each other as characteristics thereof, have the direction of the length of the gates of the respective thin film transistors arranged at an inclination of within ±20 degree with respect to the longitudinal direction of the strip-like grown crystals, and they are arranged such that, when channel regions of respective thin film transistors are imaginarily extended in parallel to the growth direction of the strip-like grown crystals, at least portions of the channel regions are superposed on each other.
摘要:
The irregularities of characteristics of a pair of transistors, which are prepared by a pseudo single crystallizing technique, are reduced. To achieve this, semiconductor layers are formed on a substrate and have pseudo single crystal regions therein, and a plurality of thin film transistors are arranged inside of the pseudo single crystal regions. Two or more of the plurality of thin film transistors, which are required to exhibit small irregularities relative to each other as characteristics thereof, have the direction of the length of the gates of the respective thin film transistors arranged at an inclination of within ±20 degree with respect to the longitudinal direction of the strip-like grown crystals, and they are arranged such that, when channel regions of respective thin film transistors are imaginarily extended in parallel to the growth direction of the strip-like grown crystals, at least portions of the channel regions are superposed on each other.