Patent ID: 9720330
Date: 2017-08-01
CPC Classifications: B82Y,G02F,G03F,H01L,Y02E

Claim:
1. A method for forming a conductive micro-grating or nano-grating structure comprising: passing a substrate comprising a layer of conductive material having a radiation curable photoresist material disposed thereon under a rigid patterned surface of a roller phase mask device having a transparent cushion layer comprising an elastomeric polymer disposed beneath the rigid patterned surface, wherein the roller phase mask has a modified checkerboard pattern comprising dislocated rectangular units which overlap along only one axis with a neighboring rectangular unit and having at least one gap defined between neighboring rectangular units; directing radiation from inside the roller phase mask device through one or more regions of the rigid patterned surface to the radiation curable photoresist material, so as to produce an optical phase shift to cure one or more preselected regions of the radiation curable photoresist material on the substrate, wherein the radiation is either generated from a radiation source disposed inside the roller phase mask device or the radiation is reflected by a reflector device disposed inside the roller phase mask device that reflects radiation from an external source directed at the roller phase mask device, wherein the one or more preselected regions define a first plurality of rows and a second plurality of rows distinct from the first plurality of rows; removing the uncured photoresist material and the underlying conductive material in regions outside the one or more preselected regions; and removing the cured photoresist material from the one or more preselected regions wherein a portion of the first plurality of rows intersect with and contact a portion of the second plurality of rows in one or more connected regions, so that the underlying conductive material defines the conductive micro-grating or nano-grating structure as a connected grid pattern having a transparency for visible light of greater than or equal to about 80%, wherein the one or more connected regions have a first width which is about twice a second width of the first plurality of rows and the second plurality of rows outside the one or more connected regions.