Importance

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Abstract

A method is disclosed for both making microlabels and for using these labels to provide a unique system for identifying an integrated circuit (IC) die on a wafer, in one embodiment, by applying a color bar encoded microlabel, small enough to be placed on the surface of the die, with the microlabel being on the order of 2 mm.times.2 mm in overall size. In one embodiment, the label consists of a number of colored lines or bars similar to a black/white bar code, with each bar having a distinct color or hue, the width of the bars being in the 5-120 micron range in terms of width, the bars being either contiguous or separated by a thin bar of distinct color. The microlabels, whether color bar or black/white coded, are applied preferably at the wafer probing stage of manufacture, wherein each die is labelled with the bar code best expressing the parameters the manufacturer is desirous of using for further processing and/or ultimate sales and/or use. A specialized real time photographic technique is disclosed in one embodiment for forming the ultra-small labelling lines on the microlabel's substrate, with the process enabling each microlabel to be different and manufactured on-the-fly to carry information associated with a given die. Further, each die may be labelled with additional microlabels in the subsequent stages of manufacture. Additionally, each capsule or device package containing a die may also be tagged with one or more microlables. Other techniques for producing the microlabels, whether color coded or black and white, include vapor deposition, metallic colored foil layering, each of the above requiring shaving of layered sheets and deposition of colored strips in the furrows of etched or scribed sheets. In a further embodiment, ink jet stripes are laid down on a moving web or substrate in parallel multi-colored rows. The microlabels may be utilized in any application in which product identification requires exceedingly small labels. Moreover, microlabels bearing other indicia such as letters or numerals, either with or without bar codes, offers IC manufacturers and others a unique microlabelling capability.

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First Claim