International Business Machines Corporation

Ramesh R Kodnani

Michael A Gaynes

Mark Vincent Pierson

Luis Jesus Matienzo

Allan O Johnson

Frank Daniel Egitto

Edward J Tasillo

Son K Tran

Thomas M Culnane

Charles Gerard Woychik

Konstantinos I Papathomas

David Brian Stone

William John Rudik

Richard Allen Day

Richard Lee Baker

Ronald Joseph Becker

Two surfaces are adhesively bonded together by providing on one of the surfaces a central, single point adhesive contact deposit and providing on one of the surfaces, adhesive extending from a central point deposit in a spoke-like array diagonally across substantially the entire surface. Also provided is the article obtained by the above method as well as the assembly used for bonding the two surfaces together. The surfaces are brought together, one on top of the other, with the adhesive located between the surfaces to cause the adhesive to spread out and cover the surfaces to thereby bond them together.

Bonding together surfaces

A method for bonding heat sinks to packaged electronic components comprises the steps of: (a) exposing to a plasma a surface of a molded polymer formed on a substrate; (b) allowing the plasma to at least partially convert silicon-containing residue on the surface to silica; and (c) bonding an article to the surface by applying an adherent between the article and the surface. Often, the silicon-containing residue is silicone oil, a mold release compound, which may prevent the formation of a bond when using conventional bonding methods and materials. The silica layer formed on the surface of the molded polymer assists in formation of a proper bond. The plasma may be an oxygen plasma and the adherent may be selected from either a heat cured silicone-based paste adhesive with a metal oxide filler or a heat cured porous polymer film impregnated with adhesive. In particular, the film may be polytetrafluoroethylene, the adhesive may be polybutadine, and the film may be further impregnated with a metal oxide heat transfer medium, such as zinc oxide. An alternate method comprises applying the porous polymer film without plasma treatment and heat curing the film to form a proper bond.

Method for bonding heat sinks to overmolds and device formed thereby

An electronic module having enhanced adhesion at the chip passivation and underfill interface is disclosed. The surface of the chip passivation is chemically modified to a sufficient depth such that the cured passivation is more reactive. The modified surface is treated with a polyamine preferably having a cyclic amine group extending from a preferably aliphatic backbone. During reflow of the solder joints of the electronic module by heating, the modified passivation reacts with the polyamine at the amine functionality. Following underfill of the electronic module with a polymeric material, preferably an epoxy resin, the polyamine on the surface of the passivation reacts with the underfill material during curing of the underfill material. The resulting electronic module is more robust since the amine acts as a chemical anchoring site for both the modified passivation and the underfill material. A method of assembling an electronic module utilizing the polyamine treatment at the chip and wafer level is also disclosed.

Flip-chip package with optimized encapsulant adhesion and method

A large liquid crystal display optical structure can be created by providing a transparent substrate with a dark mesh pattern disposed thereon. A means for optical scattering is over, adjacent, or surrounding the dark mesh, with a polarizer laminated to a smooth surface of the means for optical scattering.

LCD cover optical structure and method

A semiconductor chip carrier assembly which includes a flexible substrate having a metallicized path on one of its surfaces in electrical communication with a semiconductor chip. A stiffener is disposed adjacent to said flexible substrate and is bonded thereto by an adhesive composition. The adhesive composition which comprises a microporous film laden with a curable adhesive is disposed between the flexible substrate and the stiffener. A cover plate is adhesively bonded to the semiconductor chip and to the stiffener. A process of making the assembly involving disposition of the flexible substrate in a vacuum fixture upon which the adhesive composition and stiffener is placed followed by the application of heat and pressure to cure the curable adhesive is also described.

Process for making semiconductor chip assembly

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.

TFT panel alignment and attachment method and apparatus

A selectively compliant chuck for assembling tiles into larger LCD displays facilitates alignment between a cover plate and a tile. A linear clutch is positioned between the tile chuck and the tile chuck carrier. This allows each chuck to float in the axis perpendicular to the tile's mating surface. The chuck has freedom to move linearly in this axis, and allows for pitch and roll motion as well. This floating connection can be turned on or off at will. Thus, a tile attached to the chuck can be lowered to intimately contact a cover plate and the chuck will compliantly move for high mating tolerances. Thereafter, the clutch can be locked to fix the chuck in it's current position. In this manner, the tile can be raised so that an adhesive can be applied to the cover plate. The tile can then be lowered back over the adhesive with the clutch locked and alignment maintained.

Selectively compliant chuck for LCD assembly

Plates that are especially suitable for use in liquid crystal display structures comprising a transparent substrate; a dark mesh material on the substrate having a thickness of about 1 to about 30 microns; wherein the dark mesh material comprises a photocured photoimageable organic polymeric composition and a coloring agent; and wherein the dark mesh material has an optical density of about 0.5 to about 3 in the visible light range; and a polarizing layer are provided along with methods for their fabrication.

Plate for liquid crystal display, method and polymeric compositions

A system for aligning and attaching together a plurality of thin film transistor tiles for constructing a flat panel display. A coverplate loading station where a coverplate that the tiles are to be attached to is arranged on a coverplate support. A coverplate bonding material dispensing station where a bonding material for bonding the tiles to the coverplate is applied to a surface of the coverplate. A tile placement station where the tiles are arranged on the coverplate. A tile aligning and securing station where the tiles are aligned relative to each other and the coverplate by the tile aligner and where the tiles are at least partially bonded to the coverplate. A tile assembly bonding material dispensing station where a bonding material is applied to a surface of the tiles opposite the side that the coverplate is bonded to. A backplate placement station where a backplate is arranged on the tiles. A backplate aligning and securing station where the backplate is aligned with the tiles and the coverplate and at least partially secured to the tiles. A full bonding station where the tiles are fully bonded to the coverplate and the backplate.

A method for bonding heat sinks to packaged electronic components comprises the steps of: (a) exposing to a plasma a surface of a molded polymer formed on a substrate; (b) allowing the plasma to at least partially convert silicon-containing residue on the surface to silica; and (c) bonding an article to the surface by applying an adherent material between the article and the surface. Often, the silicon-containing residue is silicone oil, a mold release compound, which may prevent the formation of a bond when using conventional bonding methods and materials. The silica layer formed on the surface of the molded polymer assists in formation of a proper bond. The plasma may be an oxygen plasma and the adherent material may be selected from either a heat cured silicone-based paste adhesive with a metal oxide filler or a heat cured porous polymer film impregnated with adhesive. In particular, the film may be polytetrafluoroethylene, the adhesive may be polybutadine, and the film may be further impregnated with a metal oxide heat transfer medium, such as zinc oxide. An alternate method comprises applying the porous polymer film without plasma treatment and heat curing the film to form a proper bond.

Growing community of inventors

Binghamton, NY, United States of America

Ramesh R Kodnani