Patent ID: 10921609

Abstract:
A diffuser plate capable of achieving excellent appearance quality when an image is projected. A transmissive diffuser plate including a microlens angle modulation distribution group provided on at least one of a light incident surface and a light emitting surface is provided. A microlens angle modulation distribution group includes a plurality of microlenses and an angle modulation part having an angle modulation distribution for angle-modulating a direction of main light emitted from each of the plurality of microlenses. When a ratio λ/P of a wavelength λ [μm] of the main light to an average arrangement period P [μm] of the microlens is denoted by θ [rad], and when the direction of the main light emitted from each of the plurality of microlenses is modulated by a modulation angle α [rad], a ratio α/θ of the modulation angle α to θ satisfies 0.1<α/θ<10.0.