DISPLAY REFLECTANCE MODEL-BASED ON THE BRDF

Many flat panel displays (FPDs) have anti-reflection sur face treatmen ts that differ in character from those of traditional cathode-ray-tube displays. Specular reflection models (mirror-like, producing a distin ct image) combined with diffuse (Lambertian) reflection models can be entirely inadequate to characterize the reflection properties of such displays. A third reflection component, called haze, exists between sp ecular and diffuse. Display metrology should account for the haze comp onent of reflection. That is best done using the bidirectional reflect ance distribution function (BRDF). The effects of using oversimplified reflectance models are discussed in contrast with a parameterized BRD F. (C) 1998 Elsevier Science B.V.