Patent ID: 6233033
Filing Date: 2001-05-15
Classification: G02F

Abstract:
A process for forming a pixel array comprising the steps of:forming an intermetal dielectric layer over an interconnect metallization layer;forming a first dielectric layer over the intermetal dielectric layer, the first dielectric layer different than the intermetal dielectric layer;forming a second dielectric layer over the first dielectric layer, the second dielectric layer different than the first intermetal dielectric layer;patterning a trench photoresist mask over the second dielectric layer, the trench photoresist mask masking pixel regions and exposing inter-pixel regions;creating a trench by etching the second dielectric layer and the first dielectric layer in inter-pixel regions to stop on the intermetal dielectric layer;removing the trench photoresist mask;forming a reflective metal layer over the second dielectric layer and within the trench;patterning a pixel photoresist mask over the reflective metal layer, the pixel photoresist mask masking first alternative pixel regions and exposing second alternative pixel regions;etching the reflective metal layer and the second dielectric layer in second alternative pixel regions to stop on the first dielectric layer;forming a third dielectric layer over the reflective metal layer in first alternative pixel regions and over the first dielectric layer in second alternative pixel regions;forming a second reflective metal layer over the third dielectric layer, the second reflective metal layer having a raised portion in first alternative pixel regions and a lower portion in second alternative pixel regions;forming a fourth dielectric layer over the second reflective metal layer; andchemical mechanical polishing through the fourth dielectric layer, the raised portion of the second reflective metal layer, and the third dielectric layer to stop on the first reflective metal layer and the lower portion of the second reflective metal layer, such that first pixels are formed in first alternate pixel regions from the first reflective metal layer and second pixels are formed in the second alternate pixel regions from the lower portion of the second reflective metal layer, the first and second pixels separated and electrically isolated from one another by the third dielectric layer.