Kuraray Co., Ltd.

Kurarayco., Ltd.

Junji Watanabe

Masaru Karai

Atsushi Uchida

Chikafumi Kurahashi

Tomohiro Takahashi

A diffuser plate includes a plurality of fine structures having two or more types of lens functions arranged on a main surface. Intensity of diffused light within a desired diffusion angle range is substantially uniform, and the diffuser plate satisfies a relation of P&#xd7;P&#xd7;Sk&#x2264;400 [&#x3bc;m], where P is an average pitch of the plurality of fine structures, Sk is a standard deviation of relative luminance of the plurality of fine structures in their front directions, P&#x2264;200 [&#x3bc;m], and Sk&#x2265;0.005. Thus, it is possible to provide a diffuser plate having a simple structure capable of achieving optical properties with little luminance and color unevenness and excellent appearance quality when an image is projected.

Diffuser plate

The present disclosure pertains to the field of screen. It is an object of the present disclosure to provide a transmissive screen including a microlens array. The screen of the present disclosure further comprises an aperture array arranged on a surface opposite to the surface on which the microlens array is disposed. A light shielding portion of the aperture array is a metal film. The transmissive screen of the present disclosure can be used for a display.

Screen for display

A composite diffuser plate capable of inhibiting luminance unevenness from occurring locally is described. The composite diffuser plate includes a first diffuser plate and a second diffuser plate arranged in this order from an incident side. At least one of the first diffuser plate and the second diffuser plate is composed of a random microlens array including multiple microlenses. The microlenses include a plurality of parameters defining a lens shape. At least one of the plural parameters is randomly distributed. The random microlens array causes a phase difference to be generated in transmitted light.

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Kamisu, Japan

Junji Watanabe