Abstract
AbstractThe concept of the BRDF (Bidirectional Reflectance Distribution Function) is applied to analyze, characterize and understand the reflective properties of LCDs and their components in more detail. BRDFs are measured in the plane of light incidence with a goniometric apparatus (“in‐plane BRDF”) while the full 2‐dimensional BRDF is measured with a conoscopic device. BRDF‐curves of typical reflective LCDs clearly show the individual contributions of the first surface (unwanted reflections) and the component from the reflector, which is modulated by the LC‐cell and is thus carrying the information to be displayed. The effect of anti‐glare coatings on the front polarizer surface is analyzed via BRDF measurements.Based on the acquired BRDF data we explain the function of a device for diffuse reflective illumination that can be considered as the correspondence to the “dark‐room condition” in the case of transmissive LCDs since it is designed to effectively avoid disturbing unwanted reflections from the first display to air interface and, at the same time assuring illumination over a wide solid angle (up to 70°).
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