瓊邊廣翅蠟蟬 Ricanoides flabellum
Reference :
http://www.nature.edu.hk/species_database/species/ricaniidae
Old ID :
Ricania apicalis 端點廣翅蠟蟬
Reference :
A Photographic Guide to Hong Kong Insects 香港昆蟲圖典 1st Edition 2014 P.105 - Hong Kong Entomological Society
Bird seemed dazed from hitting a window. Flew off a minute or so later.