公开(公告)号：US11719862B2

公开(公告)日：2023-08-08

申请号：US17135137

申请日：2020-12-28

Applicant: Optivision Technology Inc.

Inventor： Li-Jen Hsu ,  Nan-Hung Kuo ,  Tsung-Hsien Wu ,  Young-Cheng Chou

IPC: G02B3/08 ,  G02B1/04 ,  B29D11/00 ,  G02B1/14 ,  B29K33/00

CPC classification number: G02B3/08 ,  B29D11/00269 ,  G02B1/041 ,  G02B1/14 ,  B29K2033/12

Abstract: An optical lens device for a head-mounted display includes a transparent support substrate and a Fresnel lens disposed thereon. The Fresnel lens includes a central lens element and a plurality of prismatic elements arranged relative to the central lens element in a proximal-to-distal manner. Each of the prismatic elements has a base facing toward the support substrate, and a draft facet and a sloped facet extending from the base away from the support substrate to intersect with each other to form an apex. Each of the prismatic elements has a height measured from the base to the apex and not greater than 75 μm. The base has a width not greater than 250 μm. A method and a mold for producing the optical lens device are also disclosed.

公开(公告)号：US11360257B1

公开(公告)日：2022-06-14

申请号：US17243222

申请日：2021-04-28

Applicant: Optivision Technology Inc.

Inventor： Nan-Hung Kuo ,  Li-Jen Hsu ,  Tsung-Hsien Wu ,  Young-Cheng Chou

IPC: F21V8/00 ,  F21V33/00

Abstract: A light guide substrate includes first and second triangular prisms juxtaposed to each other on a light exit face thereof. Each of the first and second triangular prisms has a rounded vertex. The number of the first triangular prisms is smaller than the number of the second triangular prisms. Each first triangular prism has a first height from the light exit face. Each second triangular prisms has a second height from the light exit face. The second height is between 20 and 90 percent of the first height. A backlight module includes the aforesaid light guide substrate, a reverse prism sheet disposed on the light guide substrate, and a light emitting unit to emit light rays into the light substrate.