Title:
DIFFUSER PLATE, DISPLAY DEVICE, PROJECTION DEVICE, AND LIGHTING DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/190680
Kind Code:
A1
Abstract:
[Problem] To impart an irregular phase difference to diffused light from a plurality of lenses by using a new variable element having a microlens array structure in order to further increase an effect of suppressing unnecessary diffracted light including spectral diffracted light and zero-order diffracted light, thereby further improving the uniformity and light distribution of the diffused light. [Solution] Provided is a diffuser plate comprising: a base material; and a microlens array composed of a plurality of microlenses disposed on an X-Y plane on at least one surface of the base material, wherein each microlens has a surface shape varying randomly on the basis of a reference surface shape, the plurality of microlenses have different surface shapes from each other, each microlens is disposed at a position shifted randomly in a Z-direction which is perpendicular to the X-Y plane from a reference position in the Z-direction, and a step in the Z-direction is present at a boundary between the plurality of microlenses adjacent to each other.
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Inventors:
ARIMA MITSUO (JP)
ISHIWATA MASAYUKI (JP)
ISHIWATA MASAYUKI (JP)
Application Number:
PCT/JP2023/012794
Publication Date:
October 05, 2023
Filing Date:
March 29, 2023
Export Citation:
Assignee:
DEXERIALS CORP (JP)
International Classes:
G02B5/02; F21V3/00; F21V3/02; G02B3/00; G09F9/30; F21Y115/10; F21Y115/30
Domestic Patent References:
| WO2016051766A1 | 2016-04-07 | |||
| WO2017188225A1 | 2017-11-02 | |||
| WO2020153319A1 | 2020-07-30 | |||
| WO2019163678A1 | 2019-08-29 |
Foreign References:
| JP2004505306A | 2004-02-19 | |||
| JP2018109670A | 2018-07-12 | |||
| JP2015169804A | 2015-09-28 | |||
| JP2015034877A | 2015-02-19 |
Attorney, Agent or Firm:
AOMI PATENT (JP)
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