摘要:
A method for aligning a plurality of thin film transistor tiles for constructing a flat panel display. A coverplate is arranged on a coverplate support. A first layer of a bonding material is applied to at least one of a first side of each of the tiles and a surface of the coverplate on which the tiles are to be secured. The tiles are arranged on the coverplate, such that the first layer of bonding material is arranged between the tiles and the coverplate. The tiles are connected to an alignment apparatus. The tiles are aligned relative to each other and the coverplate. The tiles are at least partially secured to the coverplate.
摘要:
An integrated circuit assembly has pads of a chip electrically connected to pads of a substrate with rolling metal balls. A pliable material bonds the balls in movable contact with pads of the chip and substrate. Because the balls are relatively free to move, thermal expansion differences that would ordinarily cause enormous stresses in the attached joints of the prior art, simply cause rolling of the balls of the present invention, avoiding thermal stress altogether. Reliability of the connections is substantially improved as compared with C4 solder bumps, and chips can be safely directly mounted to such substrates as PC boards, despite substantial thermal mismatch.
摘要:
A method, and associated structure, for adhesively coupling a chip to an organic chip carrier. The chip is attached to a top surface of the organic chip carrier by interfacing a solder bump between a C4 solder structure on the chip and a pad on a top surface of the chip carrier. The melting temperature of the solder bump is less than the melting temperature of the C4 solder structure. A block of ferrous material is placed on a top surface of the chip. A temporary or permanent stiffener of ferrous material is placed on the top surface of the chip carrier. A permanent magnet is coupled to a bottom surface of the chip carrier. Alternatively, an electromagnetic could be utilized instead of the electromagnet. Due to the permanent magnet or the electromagnet, a magnetic force on the stiffener is directed toward the magnet and substantially flattens the first surface of the chip carrier. Similarly, a magnetic force on the block is directed toward the magnet such that the electronic component and the chip carrier are held in alignment. The solder bump is reflowed at a temperature between the melting temperature of the solder bump and the melting temperature of the C4 solder structure. The reflowing reconfigures the solder bump. The magnetic force on the block frictionally clamps the reflowed solder between the C4 solder structure and the pad. The chip and carrier are cooled, resulting in the C4 solder structure being adhesively and conductively coupled to the pad.
摘要:
Solder bumps on electronic components are encapsulated before attachment to a substrate or component carrier. A film of sealing material is pressed against top portions of the solder bumps by pressing with a layer of low durometer flexible material. Encapsulant is positioned between the component and the film and in contact with the bumps, and partially cured. The film and layer of flexible material are removed to expose the top portions of the encapsulated solder bumps.
摘要:
Apparatus for connecting a first area array component to a substrate with a joining material. The apparatus has a nozzle directing heat toward both the first area array component and the portion of the substrate beneath the first area array component to melt the joining material. An elastic seal contacts the substrate and prevents the heat from affecting other components adjacent the first area array component. The nozzle is pressed against the substrate to restrain warping of the substrate, which might be caused by the heating of the first area array component, and to prevent damage to the substrate. The nozzle can tilt so that it conforms to the surface of the substrate. The first area array component is allowed to move freely in the direction of a plane of the substrate under the surface tension of the molten joining material during heating to center the first area array component.
摘要:
Integrated circuit chips (18, 42, or 56) are packaged within openings formed in a substrate such as PCMCIA Card (20, 40, or 54), thus allowing compliance with overall width dimension requirements for standardized electronic components. The arrangement has the advantages that thermal coefficient of expansion of the chips and cards match, and that a sturdy, multilayer ceramic substrate is used for electrical connection to electronic devices such as laptops, palmtops, and the like. In addition, a second integrated circuit chip (68) can be connected directly to the embedded chip (56), thereby allowing two chips to be accommodated in a card (54) at the same location and allowing chip-to-chip electrical communication. A variety of electrical bonding methods joining the embedded chip to the card can be employed. In addition, a variety of thermal conduction arrangements can be used for cooling the embedded integrated circuit chip.
摘要:
A method and apparatus for testing semi-conductor chips is disclosed. The individual semiconductor chips have I/O contacts. The apparatus is provided with an interposer that has contacts corresponding to the contacts on the semiconductor chip. Both the chip and the interposer contacts can be any known type including metal ball, bumps, or tabs or may be provided with dendritic surfaces. The chip contacts are first brought into relative loose temporary contact with the contacts on the interposer and then a compressive force greater that 5 grams per chip contact is applied to the chip to force the chip contacts into good electrical contact with the interposer contacts. Testing of the chip is then performed. The tests may include heating of the chip as well as the application of signals to the chip contacts. After testing the chip is removed from the substrate.
摘要:
The present invention is an apparatus and method for maximizing light beam utilization in patterning applications by positioning a plurality of mask mirrors in the light beam path to form patterned light onto a plurality of work pieces. Each mask mirror is designed so that a portion of the light beam area needed for exposing a work piece to patterned light is reflected from the mask mirror, while the remainder is passed through the mask mirror to another mask mirror. Alternatively, each mask mirror can be designed so that a portion of the light beam area needed for exposing a work piece to patterned light is passed through the mask mirror, while the remainder is reflected to another mask mirror.
摘要:
A pin which has a compressive strength less than the tensile strength of a substrate can be fixed into a hole in the substrate when the substrate is held between a stopping block and a clamp by transporting the pin into the hole with sufficient kinetic energy that the pin is forged into a shape defined by the hole upon impacting the stopping block.The pin can be retained in the substrate by forging it into a headed and bulged shape defined by recesses in the stopping block and the clamp on either side of the hole.
摘要:
An insertion device for two or four pin dual in-line electronic insertion machines which include a radial array of transfer units associated with a picker unit which grasps a component and inserts it into a circuit board.