we've worked is Present Perfect, we have worked is Present Perfect, "we've" is a contraction of "We have". "
We had worked" is Past Perfect represents an action completed. "We have worked with a company in New York, eMagin, for a while" indicates the action is ongoing.
http://www.oled-info.com/amd-confirms-its-collaboration-oled-microdisplay-maker-emagin
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