摘要:
A solder joint comprising a solder capture pad on a substrate having a circuit; and a lead free solder selected from the group comprising Sn—Ag—Cu solder and Sn—Ag solder adhered to the solder capture pad; the solder selected from the group comprising between 0.1 to 2.0% by weight Sb or Bi, and 0.5 to 3.0% Ag. Formation of voids at an interface between the solder and the solder capture pad is suppressed, by including Zn. Interlayer dielectric delamination is suppressed, and electromigration characteristics are greatly improved. Methods for forming solder joints using the solders.
摘要:
Conducting liquid crystal polymer matrix comprising carbon nanotubes aligned in the matrix is provided, along with use thereof and method of fabrication.
摘要:
A structure. The structure includes a substrate and an interposer. The substrate includes a heat source and N continuous substrate channels on a first side of the substrate (N≧2). The interposer includes N continuous interposer channels coupled to the N substrate channels to form M continuous loops (1≦M≦N). Each loop independently consists of K substrate channels and K interposer channels in an alternating sequence. For each loop, K is at least 1 and is subject to an upper limit consistent with a constraint of the M loops collectively consisting of the N interposer channels and the N substrate channels. Each loop is independently open ended or closed. The first side of the substrate is connected to the interposer. The interposer is adapted to be thermally coupled to a heat sink such that the interposer is interposed between the substrate and the heat sink.
摘要:
In a liquid crystal display device, a method for creating desirable pretilt angle by means of topography of the substrates, such as a surface that is sloped with respect to the surface of the electrodes. In combination with a low pretilt but highly photo-stable alignment layer, which may be very resistant to high levels of ultraviolet radiation, a high pretilt and photo-stable alignment structure is generated, by essentially combining two incompatible technical approaches. The ever more stringent requirements for projection displays are met. The methods for producing such sloped surfaces and the considerations related to design of the sloped surfaces are disclosed.
摘要:
A method of producing a metal-graphite foam composite, and particularly, the utilization thereof in connection with a cooling apparatus. Also provided is a cooling apparatus, such as a liquid cooler or alternatively, a heat sink for electronic heat-generating components, which employ the metal-graphite foam composite.
摘要:
A thermal interposer is provided for attachment to a surface of a semiconductor device. In one embodiment, the thermal interposer includes an upper plate having a bottom surface with a plurality of grooves and made of a material having high thermal conductivity, and a lower plate having a top surface with a plurality of grooves and made of a material having a coefficient of thermal expansion that is substantially the same as the coefficient of thermal expansion of the material of a semiconductor device that is bonded to the bottom surface of the lower plate. The bottom surface of the upper plate is hermetically bonded to the top surface of the lower plate so that a vapor chamber is formed by the upper and lower plates, and walls of the grooves on the top surface of the lower plate extend to within less than 250 microns from walls of the grooves on the bottom surface of the upper plate comprise a plurality of second walls the first walls.
摘要:
A process for measuring a property of a sample is provided. The sample has an external surface enclosing an inner portion, and firstly, the sample is deformed by applying a predetermined non-contact pressure to deform a portion of the sample. Then a signal, which is at least suitable for transmission over the air, is directed towards the deformed portion of the sample, and further propagates through the external surface and the inner portion of the sample. Then an echoed signal generated by the inner portion of the sample in response to the propagation of the signal is detected; wherein the echoed signal incorporates information relating to a deformation of the inner portion of the sample. The property of the sample is determined from the deformation of the inner portion of the sample.
摘要:
Multi-domain liquid crystal cells having twist angles less than 90 degrees, and LCDs containing such liquid crystal cells, are provided. Such liquid crystal cells are stable, particularly at zero and high fields, and provide wide viewing angles. Also provided are methods of using an adjustable particle beam in combination with a mask to generate multi-domains alignments. Such methods are useful for producing liquid crystal cells in general, and for producing the novel multi-domain low twist angle liquid crystal cells of the present invention in particular.
摘要:
A liquid crystal display device includes cell wall structure and a chiral nematic liquid crystal material. The cell wall structure and the liquid crystal cooperate to form focal conic and twisted planar textures that are stable in the absence of a field. A device applies an electric field to the liquid crystal for transforming at least a portion of the material to at least one of the focal conic and twisted planar textures. The liquid crystal material has a pitch length effective to reflect radiation having a wavelength in both the visible and the infrared ranges of the electromagnetic spectrum at intensity that is sufficient for viewing by an observer. One liquid crystal material may be disposed in a single region or two or more liquid crystal materials may be used, each in separate regions even without the infrared reflecting layer. One aspect of the invention is directed to a photolithography method for patterning a substrate of the display. The display may also have multicolor capabilities by including separate layers of at least two or three liquid crystal materials that reflect visible light. A full color stacked display may be produced with grey scale capabilities.
摘要:
A liquid crystal display device includes cell wall structure and a chiral nematic liquid crystal material. The cell wall structure and the liquid crystal cooperate to form focal conic and twisted planar textures that are stable in the absence of a field. A device applies an electric field to the liquid crystal for transforming at least a portion of the material to at least one of the focal conic and twisted planar textures. The liquid crystal material has a pitch length effective to reflect radiation having a wavelength in both the visible and the infrared ranges of the electromagnetic spectrum at intensity that is sufficient for viewing by an observer. One liquid crystal material may be disposed in a single region or two or more liquid crystal materials may be used, each in separate regions even without the infrared reflecting layer. One aspect of the invention is directed to a photolithography method for patterning a substrate of the display. The display may also have multicolor capabilities by including separate layers of at least two or three liquid crystal materials that reflect visible light. A full color stacked display may be produced with grey scale capabilities.