Photo diode: A small solid-state device capable of detecting the presence or absence light; used in scanning technology. Charge coupled device (CCD) is a form of photo diode.是什么意思_Photo diode: A small solid-state device capable of detecting the presence or absence light; used in scanning technology. Charge coupled device (CCD) is a form of photo diode.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句