[电] overall brightness transfer charac-teristic

zǒng jì liàng dù chuán dì tè xìng ㄗㄨㄥˇ ㄐㄧˋ ㄌㄧㄤˋ ㄉㄨˋ ㄔㄨㄢˊ ㄉㄧˋ ㄊㄜˋ ㄒㄧㄥˋ