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EP-4737791-A1 - LIGHT-EMITTING MODULE

EP4737791A1EP 4737791 A1EP4737791 A1EP 4737791A1EP-4737791-A1

Abstract

A light-emitting module (2) includes a housing and light-emitting units (25). The light-emitting units (25) are arranged along a first direction (X) and a second direction (Y) to form an array. Each of the light-emitting units (25) includes a first light-emitting element (252) and two second light-emitting elements (253). The second light-emitting elements (253) are disposed at two opposite sides of the first light-emitting element (252). A ratio of a length (253a) of any one of the second light-emitting elements (253) parallel to the first direction (X) to a length (252a) of the first light-emitting element (252) parallel to the first direction (X) ranges from 0.35 to 0.55. A sum of areas of upper surfaces of the second light-emitting elements (253) is not greater than an area of an upper surface of the first light-emitting element (252).

Inventors

  • HUANG, TZU-HUNG
  • LIN, CHIH-FENG
  • CHUEH, WAN-TING
  • CHEN, CHIEH
  • LEE, CHIN-LUN

Assignees

  • Top Victory Investments Limited

Dates

Publication Date
20260506
Application Date
20251023

Claims (15)

  1. A light-emitting module (2), comprising: a housing which includes a bottom board (21); and light-emitting units (25) which are separately disposed on said bottom board (21) and which are arranged along a first direction (X) and a second direction (Y) intersecting with the first direction (X) to form an array, each of said light-emitting units (25) including a first light-emitting element (252) and two second light-emitting elements (253) which emit lights having colors different from a color of a light emitted by said first light-emitting element (252), characterized in that , for each of said light-emitting units (25), said first light-emitting element (252) and said second light-emitting elements (253) are respectively quadrilateral prisms and respectively have upper surfaces away from said bottom board (21), said second light-emitting elements (253) being disposed at two opposite sides of said first light-emitting element (252), a ratio of a length (253a) of any one of said second light-emitting elements (253) parallel to the first direction (X) to a length (252a) of said first light-emitting element (252) parallel to the first direction (X) ranging from 0.35 to 0.55, a sum of areas of said upper surfaces of said second light-emitting elements (253) being not greater than an area of said upper surface of said first light-emitting element (252).
  2. The light-emitting module (2) as claimed in claim 1, wherein arrangements of said first light-emitting element (252) and said second light-emitting elements (253) in each of said light-emitting units (25) are the same.
  3. The light-emitting module (2) as claimed in any one of claims 1 and 2, wherein, in each of said light-emitting units (25), a ratio of a length (253b) of any one of said second light-emitting elements (253) parallel to the second direction (Y) to a length (252b) of said first light-emitting element (252) parallel to the second direction (Y) ranges from 0.9 to 1.2.
  4. The light-emitting module (2) as claimed in any one of claims 1 to 3, wherein, in each of said light-emitting units (25), a ratio of the sum of the areas of said upper surfaces of said second light-emitting elements (253) to the area of said upper surface of said first light-emitting element (252) ranges from 0.7 to 1.0.
  5. The light-emitting module (2) as claimed in any one of claims 1 to 4, wherein each of said light-emitting units (25) further includes: a substrate (251) on which said first light-emitting element (252) and said second light-emitting elements (253) are disposed; a reflection element (254) which is connected to said substrate (251) and which surrounds said first light-emitting element (252) and said second light-emitting elements (253), said reflection element (254) defining an opening that is opposite to said substrate (251); an encapsulating layer (256) which covers said first light-emitting element (252) and said second light-emitting elements (253); and a phosphor material (257) which is distributed in said encapsulating layer (256), a color of a light emitted by said phosphor material (257) being different from the color of the light emitted by said first light-emitting element (252) and the colors of the lights emitted by said second light-emitting elements (253).
  6. The light-emitting module (2) as claimed in claim 5, wherein an inner surface of said reflection element (254) facing said first light-emitting element (252) is a continuous arc surface.
  7. The light-emitting module (2) as claimed in any one of claims 5 and 6, wherein said phosphor material (257) is red phosphor powder.
  8. The light-emitting module (2) as claimed in claim 7, wherein said red phosphor powder is potassium fluorosilicate phosphor.
  9. The light-emitting module (2) as claimed in any one of claims 5 to 8, wherein said phosphor material (257) is concentrated on a surface of said substrate (251) and said upper surface of said first light-emitting element (252) and said upper surfaces of said second light-emitting elements (253) in each of said light-emitting units (25).
  10. The light-emitting module (2) as claimed in any one of claims 5 to 8, wherein said phosphor material (257) is uniformly distributed in said encapsulating layer (256).
  11. The light-emitting module (2) as claimed in any one of claims 5 to 8, wherein said encapsulating layer (256) has a first portion which is adjacent to said substrate (251) and free of said phosphor material (257), and a second portion which is disposed on said first portion away from said substrate (251) and contains said phosphor material (257) therein.
  12. The light-emitting module (2) as claimed in any one of claims 1 to 11, wherein said housing further includes: a surrounding wall (22) which extends upwardly from an outer periphery of said bottom board (21); and a protecting cover (23) which is light-transmissible, which is connected to said surrounding wall (22) and which is opposite to said bottom board (21), wherein said bottom board (21), said surrounding wall (22) and said protecting cover (23) define a chamber (24), said light-emitting units (25) being disposed in said chamber (24).
  13. The light-emitting module (2) as claimed in claim 12, wherein a distance between a surface of said protecting cover (23) facing said light-emitting units (25) and said bottom board (21) is not less than 20 mm.
  14. The light-emitting module (2) as claimed in any one of claims 1 to 13, wherein, in each of said light-emitting units (25), said second light-emitting elements (253) and said first light-emitting element (252) are arranged in the first direction (X).
  15. The light-emitting module (2) as claimed in any one of claims 1 to 13, wherein, in each of said light-emitting units (25), said second light-emitting elements (253) and said first light-emitting element (252) are arranged in the second direction (Y).

Description

The disclosure relates to a light-emitting module, and more particularly to a light-emitting module of a light-emitting device. Light-emitting diodes (LEDs) are usually used as light sources in conventional displays that are used in, for instance, phones, computers, televisions or large electronic advertising boards. In order to achieve vivid color quality, besides white LEDs that emit white light, LEDs that correspondingly emit light beams of three primary colors (red, green and blue) are used to achieve color mixing, and by adjusting proportion of the primary colors, desired colors are produced. In order to achieve great color mixing quality and high-fidelity color rendering, light-emitting sources emitting three types of colors, i.e., red light (R), green light (G) and blue light (B), are mostly used. However, the light-emitting sources that are arranged in a display are often subject to dead zones in color mixing due to limitations in spatial arrangement thereof, and thus the displayed image exhibits color breakup, resulting in uneven color rendering, which in turn affects the viewing quality for audiences. Therefore, how to reduce color breakup to attain good color mixing is one of development directions of the industry currently. According to an aspect of the disclosure, there is provided a light-emitting module according to claim 1. Other features and advantages of the disclosure will become apparent in the following detailed description of the embodiment(s) with reference to the accompanying drawings. It is noted that various features may not be drawn to scale. FIG. 1 is a top view of a first embodiment of a light-emitting module according to the disclosure.FIG. 2 is a sectional side view of the first embodiment.FIG. 3 is a top view of a light-emitting unit contained in the first embodiment of the light-emitting module.FIG. 4 to FIG. 6 are sectional side views respectively illustrating different distribution configurations of a phosphor material in the light-emitting unit of the first embodiment.FIG. 7 is a top view of a second embodiment of the light-emitting module according to the disclosure.FIG. 8 is a sectional side view of an embodiment of the light-emitting module according to the disclosure, illustrating lenses being disposed on light-emitting units of the light-emitting module. Before the disclosure is described in greater detail, it should be noted that where considered appropriate, reference numerals or terminal portions of reference numerals have been repeated among the figures to indicate corresponding or analogous elements, which may optionally have similar characteristics. It should be noted herein that for clarity of description, spatially relative terms such as "top," "bottom," "upper," "lower," "on," "above," "over," "downwardly," "upwardly" and the like may be used throughout the disclosure while making reference to the features as illustrated in the drawings. The features may be oriented differently (e.g., rotated 90 degrees or at other orientations) and the spatially relative terms used herein may be interpreted accordingly. Referring to FIGS. 1 to 4, a first embodiment of a light-emitting module 2 according to the disclosure includes a bottom board 21, a surrounding wall 22 which extends upwardly from an outer periphery of the bottom board 21, a protecting cover 23 which is connected to the surrounding wall 22 and which is opposite to the bottom board 21, and a plurality of light-emitting units 25. The bottom board 21, the surrounding wall 22 and the protecting cover 23 cooperatively define a chamber 24 which has an opening covered by the protecting cover 23. The protecting cover 23 is light-transmissible. The bottom board 21, the surrounding wall 22 and the protecting cover 23 cooperatively form a housing. The light-emitting units 25 are separately disposed on (e.g., connected to) the bottom board 21 and are received in the chamber 24. The light-emitting units 25 are arranged along a first direction (X) and a second direction (Y) which intersects with the first direction (X) to form an array, and are electrically connected in series, in parallel or through other methods. In certain embodiments, a vertical distance (D) between a surface of the protecting cover 23 which faces the light-emitting units 25 and a surface of the bottom board 21 is not less than 20 mm so as to provide enough light-mixing space, thereby reducing a color breakup phenomenon. Specifically, each of the light-emitting units 25 includes a substrate 251, two electrodes 251a which are formed on the substrate 251, a first light-emitting element 252, two second light-emitting elements 253, a reflection element 254, an encapsulating layer 256, a phosphor material 257 which is distributed in the encapsulating layer 256, and conductive wires 258. In each of the light-emitting units 25, the first light-emitting element 252 and the second light-emitting elements 253 are disposed on the substrate 251. Arrangements of