eMagin, the OLED microdisplay maker, has entered into an agreement with Craig-Hallum Capital Group that will allow them to raise up to $4.5 million. The proceeds from the sale of shares will be used for "general corporate purposes, including R&D, sales and marketing, and working capital".
It's been years since eMagin raised new funds as the company has been generating cash for most of the time. The company says they are making good progress on direct-patterned OLEDs and their new microdisplay-based HMD prototype. It's likely that these projects require more cash then the company currently has. As of the end of Q2 2015, eMagin had 5.4 million in cash and equivalents.
Disclosure: the author of this post holds shares in eMagin