The phase holograms are expected to be able to guide the emission straight out from the OLED device and hence the external light coupling efficiency can be improved.是什么意思_The phase holograms are expected to be able to guide the emission straight out from the OLED device and hence the external light coupling efficiency can be improved.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句