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US-20260126568-A1 - LENS WITH MICRO-STRUCTURES

US20260126568A1US 20260126568 A1US20260126568 A1US 20260126568A1US-20260126568-A1

Abstract

A lens with micro-structures include a lens body and a plurality of micro-structures. The lens body has a bottom surface and a curved surface. The micro-structures are disposed on the curved surface of the lens body. Each of the micro-structures has a circular outer edge. In view from atop of the lens body, center points of the circular outer edges of the micro-structures are located at a same position. The circular outer edges are arranged at equal intervals.

Inventors

  • Chun-Ting Lin
  • Yi-Hsiang Huang
  • Hung Tsou

Assignees

  • INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE

Dates

Publication Date
20260507
Application Date
20241225
Priority Date
20241105

Claims (16)

  1. 1 . A lens with micro-structures, comprising a lens body having a bottom surface and a curved surface; and a plurality of micro-structures disposed on the curved surface of the lens body, wherein each of the micro-structures has a circular outer edge, in view from atop of the lens body, center points of the circular outer edges of the micro-structures are located at a same position, and the circular outer edges are arranged at equal intervals.
  2. 2 . The lens with micro-structures according to claim 1 , wherein the micro-structures comprise: a central circular micro-structure; and a plurality of annular micro-structures surrounding the central circular micro-structure, wherein thicknesses of the outer annular micro-structures among the micro-structures is greater than thicknesses of the inner annular micro-structures among the annular micro-structures.
  3. 3 . The lens with micro-structures according to claim 1 , wherein each of the micro-structures has a circular inner edge and the circular outer edge, and in each of the micro-structures, the circular outer edge is higher than the circular inner edge.
  4. 4 . The lens with micro-structures according to claim 1 , wherein each of the micro-structures has a circular inner edge and the circular outer edge, and in each of the micro-structures, the circular outer edge is lower than the circular inner edge.
  5. 5 . The lens with micro-structures according to claim 1 , wherein each of the micro-structures has a circular inner edge and the circular outer edge, and in each of the micro-structures, the circular outer edge is level with the circular inner edge.
  6. 6 . The lens with micro-structures according to claim 1 , wherein each of the micro-structures has a circular inner edge and the circular outer edge, and in each of the micro-structures, a height difference between the circular outer edge and the circular inner edge is between −0.06 mm and 0.34 mm.
  7. 7 . The lens with micro-structures according to claim 1 , wherein each of the micro-structures has a circular inner edge and the circular outer edge, a height difference between the circular outer edge and the circular inner edge is h, an arrangement interval of the circular outer edges is D, and a ratio (h/D) is between −0.6 and 3.4.
  8. 8 . A lens with micro-structures, comprising a lens body having a bottom surface, a top surface, and a curved surface, wherein the curved surface extends between the top surface and the base surface; and a plurality of micro-structures disposed on the curved surface of the lens body, wherein each of the micro-structures has a circular outer edge, in view from atop of the lens body, center points of the circular outer edges of the micro-structures are located at a same position, and the circular outer edges are arranged at equal intervals.
  9. 9 . The lens with micro-structures according to claim 8 , wherein the bottom surface and the top surface are planar, and in view from atop of the lens body, the base surface and the top surface have a circular contour.
  10. 10 . The lens with micro-structures according to claim 8 , wherein the micro-structures comprise a plurality of first annular micro-structures surrounding the top surface, wherein thicknesses of the outer annular micro-structures among the first micro-structures is greater than thicknesses of the inner annular micro-structures among the first annular micro-structures.
  11. 11 . The lens with micro-structures according to claim 8 , wherein each of the micro-structures has a circular inner edge and the circular outer edge, and in each of the micro-structures, the circular outer edge is higher than the circular inner edge.
  12. 12 . The lens with micro-structures according to claim 8 , wherein each of the micro-structures has a circular inner edge and the circular outer edge, and in each of the micro-structures, the circular outer edge is lower than the circular inner edge.
  13. 13 . The lens with micro-structures according to claim 8 , wherein each of the micro-structures has a circular inner edge and the circular outer edge, and in each of the micro-structures, the circular outer edge is level with the circular inner edge.
  14. 14 . The lens with micro-structures according to claim 8 , wherein each of the micro-structures has a circular inner edge and the circular outer edge, and in each of the micro-structures, a height difference between the circular outer edge and the circular inner edge is between −0.06 mm and 0.34 mm.
  15. 15 . The lens with micro-structures according to claim 8 , wherein each of the micro-structures has a circular inner edge and the circular outer edge, a height difference between the circular outer edge and the circular inner edge is h, an arrangement interval of the circular outer edges is D, and a ratio (h/D) is between −0.6 and 3.4.
  16. 16 . The lens with micro-structures according to claim 8 , wherein the top surface is a recessed region.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims the priority benefit of Taiwan application serial no. 113142256, filed on Nov. 5, 2024. The entirety of the above-mentioned patent application is hereby incorporated by reference herein. TECHNICAL FIELD The disclosure relates to a lens with micro-structures. BACKGROUND Displays have been widely used. As the demand for high brightness and high contrast of displays gradually grows, for display types that require backlight modules such as liquid crystal displays, the use of direct-lit backlight modules has gradually become the mainstream. In the direct-lit backlight modules of liquid crystal displays, most of the time, bare chip design is adopted for the light-emitting diode chips used therein, and diffuser sheets and prism sheets are usually placed above these array-arranged light-emitting diode chips. The diffuser sheets provide a light-homogenizing effect for the light emitted by the light-emitting diode chips, and the prism sheets provide a light-concentrating effect for the light emitted by the light-emitting diode chips. The combination of the diffuser sheets and the prism sheets often causes in the light to have maximum intensity in the normal direction of the liquid crystal display, so that this design will lead to overall illumination of the liquid crystal display to be uneven. Generally, it is necessary to shorten the arrangement interval between the light-emitting diode chips, and high-haze diffuser sheets are required to be used to address the aforementioned problem. However, when the arrangement interval between the light-emitting diode chips is decreased, the number of light-emitting diode chips used in the direct-lit backlight module will increase, and when the number of light-emitting diode chips used increases, the manufacturing costs of the direct-lit backlight module hike. Therefore, how to improve the overall illumination uniformity with a limited number of light-emitting diodes is a challenge that designers in this field need to face. SUMMARY An embodiment of the disclosure provides a lens with micro-structures including a lens body and a plurality of micro-structures. The lens body has a bottom surface and a curved surface. The micro-structures are disposed on the curved surface of the lens body. Each of the micro-structures has a circular outer edge. In view from atop of the lens body, center points of the circular outer edges of the micro-structures are located at a same position. The circular outer edges are arranged at equal intervals. Another embodiment of the disclosure further provides a lens with micro-structures including a lens body and a plurality of micro-structures. The lens body has a bottom surface, a top surface, and a curved surface, and the curved surface extends between the top surface and the bottom surface. The micro-structures are disposed on the curved surface of the lens body. Each of the micro-structures has a circular outer edge. In view from atop of the lens body, center points of the circular outer edges of the micro-structures are located at a same position. The circular outer edges are arranged at equal intervals. Several exemplary embodiments accompanied with figures are described below to further describe the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings are included to provide a further understanding, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments and, together with the description, serve to explain the principles of the disclosure. FIG. 1 is a cross-sectional schematic view of a lens with micro-structures and a light-emitting diode chip according to a first embodiment of the disclosure. FIG. 2 is a three-dimensional schematic view of the lens with micro-structures according to the first embodiment of the disclosure. FIG. 3A and FIG. 3B are schematic charts of intensity distribution of light emitted by a light-emitting diode after passing through different lenses with micro-structures according to the first embodiment of the disclosure. FIG. 4 is a cross-sectional schematic view of a lens with micro-structures and a light-emitting diode chip according to a second embodiment of the disclosure. FIG. 5 is a three-dimensional schematic view of the lens with micro-structures according to the second embodiment of the disclosure. FIG. 6A and FIG. 6B are schematic charts of intensity distribution of light emitted by a light-emitting diode after passing through different lenses with micro-structures according to the second embodiment of the disclosure. FIG. 7A to FIG. 7D are cross-sectional schematic views of lenses with micro-structures according to different embodiments of this disclosure. FIG. 8 is a cross-sectional schematic view of a lens with micro-structures and a light-emitting diode chip according to a third embodiment of the disclosure. FIG. 9 is a three-dimensional schematic view of the lens with mic