Method and system for dual stretching of wafers for isolated segmented chip scale packages
Described herein is a method and system for dual stretching of wafers to create isolated segmented chip scale packages. A wafer having an array of light-emitting diodes (LEDs) is scribed into LED segments, where each LED segment includes a predetermined number of LEDs. The scribed wafer is placed on a stretchable substrate or tape. The tape is stretched and a layer of optically material is placed in the separation gaps. The stretched wafer is scribed on a LED level. The tape is stretched and another layer of optically opaque material is placed in the separation gaps. The same or different optically opaque material can be used for the layers. The two layers of optically opaque material are formed to provide electrical connectivity between the LEDs in each LED segment. In an implementation, each segment or LED is individually addressable.
1. A method for dual stretching of a wafer, the method comprising:
scribing a wafer along multiple segment lines to form multiple segments;
separating the scribed wafer along the segment lines into the segments;
scribing the segments along multiple section lines to define multiple sections, each section having a light emitter;
separating the scribed sections along the section lines into the sections;
depositing an optically opaque material between at least one of the segments or the sections.
2. The method of claim 1 , further comprising curing the optically opaque material after filling the gap.
3. The method of claim 1 , wherein the optically opaque material comprises a metal.
4. The method of claim 3 , wherein:
the metal comprises a plurality of metal layers, and
the optically opaque material further comprises an insulation layers disposed between each pair of adjacent metal layers to provide electrical separation between the adjacent metal layers.
5. The method of claim 3 , wherein signals are able to be provided between the at least one of the segments or the sections via the metal.
6. The method of claim 1 , wherein:
the optically opaque material is deposited via flow deposition.
7. The method of claim 1 , wherein depositing optically opaque material between at least one of the segments or the sections comprises:
depositing a first optically opaque material between the segments; and
depositing a second opaque material between the sections.
8. The method of claim 7 , wherein:
the first optically opaque material and the second optically opaque material are the same optically opaque material.
9. The method of claim 7 , wherein:
the first optically opaque material and the second optically opaque material are different optically opaque materials.