National Semiconductor Corporation

Boonmi Mekdhanasarn

Randy Hsiao-Yu Lo

Abdul R Ahmed

Daniel P Tracy

Steven Ichikawa

Ranjan J Mathew

Randy H Y Lo

Steve M Ichikawa

An ESD structure is created on an integrated circuit by providing a conductive polymer material between a signal line and a supply node or ground reference. The conductive polymer material becomes conductive when an electric field of sufficient intensity is applied. In one embodiment, the concentration of conductive particles of the conductive polymer material is empirically determined so that the resulting film becomes conducting at a predetermined threshold voltage. The conductive polymer is applied in liquid form on the wafer surface using a silk-screen printing process or a spin-on process and then cured. The conductive polymer layer can be adapted for use in multilevel metallization systems.

Integrated ESD protection method and system

A method and structure for attaching a lead frame to a heat sink are provided. In one embodiment, a layer of thermally conductive, electrically insulating epoxy is formed on a heat sink and the epoxy layer is fully cured. A thermoplastic adhesive layer is formed on the epoxy layer, and the heat sink is clamped to the lead frame such that the thermoplastic layer contacts the lead frame. The thermoplastic layer is heated to its melting point and then cooled, thereby joining the heat sink and the lead frame. In a variation, a partially cured B-stage epoxy layer is used to replace the thermoplastic layer. The B-stage epoxy layer is fully cured to connect the lead frame to the heat sink.

Method for attaching a lead frame to a heat spreader/heat slug structure

The present invention provides an improved seal for sealing a liquid crystal display (LCD) device. An improved seal is formed between a transparent plate and a die having a pixel array. The improved seal is configured to encircle the pixel array of the die when the die and the transparent plate are joined. The die and the transparent plate are joined together such that the improved seal is disposed between the transparent plate and the die. In one embodiment, the improved seal is a hybrid seal. The hybrid seal includes a first seal encircling the pixel array of the die and adhesively coupling the transparent plate and the die. The hybrid seal further includes a second seal encircling the second seal. In another embodiment, the first seal lacks a characteristic necessary for an effective seal. The second seal possesses the characteristic, such that the hybrid seal possesses the necessary characteristic.

Seal for LCD devices and methods for making same

A lead frame having protection against electrostatic discharge is disclosed. The lead frame having protection against electrostatic discharge includes a multiplicity of leads and an electrostatic discharge protection device. The electrostatic discharge protection device includes a conductive layer and a protection layer. The protection layer is arranged to contact a plurality of leads and is formed from an electrostatic discharge protection material, which insulates the leads from the conductive layer at voltages below a predefined threshold voltage and establishes an electrical connection between the leads and the conductive layer at voltages above the threshold voltage.

Lead frame with electrostatic discharge protection

Described is a circuit board having protection against electrostatic discharge. The board includes a plurality of interconnect traces and an electrically conductive ground plane formed on a substrate such that a gap is created between the interconnect traces and the ground plane. A resistive electrostatic discharge protection material is positioned to bridge the gaps between the ground plane and the interconnect traces, such that the electrostatic discharge protection material electrically insulates the interconnect traces from the ground plane at voltages below a predefined threshold voltage and establishes an electrical connection between the interconnect traces and the conductive plane at voltages above the threshold voltage. A process of manufacturing the circuit board includes forming interconnect traces and a ground plane such that there is a gap between the ground plane and the interconnect traces. A resistive electrostatic discharge protection material is placed in the gap between the ground plane and the traces for protection against electrostatic discharge. A package including the above described circuit board and a process of manufacturing such a package are also disclosed herein.

Growing community of inventors

Sunnyvale, CA, United States of America

Boonmi Mekdhanasarn