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公开(公告)号:US20250048792A1
公开(公告)日:2025-02-06
申请号:US18927581
申请日:2024-10-25
Applicant: EPISTAR CORPORATION
Inventor: Heng-Ying CHO , Li-Yu SHEN , Yu-Yi HUNG , Chen OU , Li-Ming CHANG
Abstract: A light-emitting device including a semiconductor stack generating a first light, and a filter formed on the semiconductor stack, including a first surface facing the semiconductor stack and a second surface opposite to the first surface. The filter includes pairs of layers with different refractive indexes alternately stacked. A portion of the first light is transmitted by the filter. The light emitting device emits a second light including the portion of the first light, and the second light includes a first directional part with a first FWHM and a second directional part with a second FWHM smaller than the first FWHM. The first directional part has a first angle with a normal direction of the second surface in a range of 45-90 degrees and the second directional part having a second angle with the normal direction of the second surface in a range of 0-30 degrees.
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公开(公告)号:US20220037556A1
公开(公告)日:2022-02-03
申请号:US17389467
申请日:2021-07-30
Applicant: EPISTAR CORPORATION
Inventor: Heng-Ying CHO , Li-Yu SHEN , Yu-Yi HUNG , Chen OU , Li-Ming CHANG
Abstract: A light-emitting device, including: a semiconductor stack generating a first light; and a filter formed on the stack, including a first surface facing the stack and a second surface opposite to the first surface. The filter includes pairs of layers with different refractive indexes alternately stacked, and a portion of the first light is transmitted by the filter. The light emitting device emits a second light including the portion of the first light, and the second light includes a first directional part with a first FWHM and a second directional part with a second FWHM. The first directional part has a first angle with a normal direction of the second surface in a range of 45-90 degrees, the second directional part has a second angle with the normal direction of the second surface in a range of 0-30 degrees, and the second FWHM is smaller than the first FWHM.
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公开(公告)号:US20210408338A1
公开(公告)日:2021-12-30
申请号:US17354922
申请日:2021-06-22
Applicant: EPISTAR CORPORATION
Inventor: Heng-Ying CHO , Li-Yu SHEN , Chih-Hao CHEN , Keng-Lin CHUANG
Abstract: A light-emitting device comprises a semiconductor stack emitting a light with a peak wavelength λ; and a light field adjustment layer formed on the semiconductor stack, wherein the light field adjustment layer comprises a plurality of first layers and a plurality of second layers alternately stacked on top of each other, the plurality of first layers each comprises a first optical thickness, and the plurality of second layers each comprises a second optical thickness.
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