Front-Glass Reflection: The First Hurdle in Daytime EL of Double-Glass Modules

ⓘ This article is currently published in Chinese. An English version is being prepared — read the Chinese original.

Double-glass modules are now mainstream, but their front glass makes daytime field EL noticeably harder. The faint near-infrared EL signal from silicon has to compete with specular reflections of the sky and sun off a coated glass surface, and the two glass layers add refraction, ghosting and slight geometric distortion. This article explains why double-glass is harder to image than a glass-backsheet module, what actually suppresses the reflection on site — viewing angle, polarization, shading, time-gated filtering and working in the right waveband — and how to read the resulting images without mistaking a glare patch for a defect or letting reflection bury a real hidden crack. It closes on why daytime UAV EL still makes full-array double-glass inspection practical.