Royole raised a Series E round in August, 2018.
Chinese Rollable Display Maker Royole Raises Fresh Capital At $5B Valuation
https://www.chinamoneynetwork.com/2018/10/18/chinese-rollable-display-maker-royole-raises-fresh-capital-at-5b-valuation
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October 18, 2018
Series E - Royole Corporation - 2018-08-09 | Crunchbase
https://www.crunchbase.com/funding_round/royole-corporation-series-e--952f5ab2#section-lead-investors