US-12624821-B2 - Light-emitting module

US12624821B2US 12624821 B2US12624821 B2US 12624821B2US-12624821-B2

Abstract

The present application provides a light-emitting module, which comprises a light-emitting element and a packaging layer disposed on a substrate, the packaging layer including first and second inclined surfaces disposed on an outer side of the packaging layer from bottom to top, an upper surface of the packaging layer recessed downward corresponding to the light-emitting element, and an optical layer disposed on the upper surface of the packaging layer and extended along the upper surface of the packaging layer to form at least one first reflective surface, wherein the first angle of the first inclined surface is different from the second angle of the second inclined surface, and the at least one first reflective surface is disposed at a third angle.

Inventors

Zhi-Ting YE
Chia-Chun Hu
Po-Hsiang Tsai

Assignees

DRLIGHTEK CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20250423
Priority Date: 20240425

Claims (14)

1 . A light emitting module, comprising: a substrate; a light emitting element, disposed on the substrate; a packaging layer, disposed on the substrate, the packaging layer covering the light emitting element, the packaging layer including a first inclined surface and a second inclined surface, the first inclined surface surrounding an outer side of the packaging layer, and extending upward to form the second inclined surface, an upper surface of the packaging layer recessed downward corresponding to the light emitting element; and an optical layer, filled on the upper surface of the packaging layer, and a bottom side of the optical layer including at least a first reflective surface extended along the upper surface of the packaging layer; wherein the first inclined surface has a first angle with an X-axis, the second inclined surface has a second angle with the X-axis, the first angle of the first inclined surface is greater than the second angle of the second inclined surface while the first and second angles are greater than 90 degrees with the X-axis, and the at least one first reflective surface is disposed at a third angle less than 90 degrees with the X-axis.
2 . The light emitting module of claim 1 , wherein a bottom side of the substrate includes two electrodes, and the two electrodes are electrically connected to the light emitting element.
3 . The light emitting module of claim 1 , wherein the light emitting element emits a first light, the first light is emitted to the first inclined surface and the second inclined surface, the first inclined surface and the second inclined surface refract the first light respectively, the light emitting element emits a second light, the second light is emitted to the at least one first reflective surface, a part of the second light passes through the at least one first reflective surface, another part of the second light is reflected by the at least one first reflective surface, and the first inclined surface and the second inclined surface refract the another part of the second light respectively.
4 . The light emitting module of claim 1 , wherein the light emitting element is buried in an inner side of the substrate.
5 . The light emitting module of claim 1 , wherein the at least one first reflective surface is recessed downward corresponding to the light emitting element to form a recessed portion in a U shape, and a depth of the recessed portion is larger than a width of the recessed portion.
6 . The light emitting module of claim 1 , wherein the upper side of the substrate includes a reflective layer, including a plurality of reflective structures, which are holes or black and white ink particles respectively.
7 . The light emitting module of claim 1 , wherein the upper side of the substrate includes a reflective layer, including a plurality of reflective structures, which are holes or black and white ink particles respectively.
8 . The light emitting module of claim 1 , wherein the packaging layer includes a plurality of the first reflective surfaces, and the first reflective surfaces are disposed adjacent to each other, and the first reflective surfaces respectively recessed downward corresponding to the light emitting element along the upper surface of the packaging layer.
9 . The light emitting module of claim 1 , wherein two sides of the at least one first reflective surface extend to form at least one second reflective surface and at least one third reflective surface, the third angle of the at least one first reflective surface is larger than a fourth angle of the at least one second reflective surface, and the fourth angle is larger than a fifth angle of the at least one third reflective surface.
10 . The light emitting module of claim 9 , wherein the packaging layer includes a plurality of the first reflective surfaces, the second reflective surfaces, and the third reflective surfaces, the first reflective surfaces, the second reflective surfaces, and the third reflective surfaces disposed adjacent to each other.
11 . The light emitting module of claim 1 , further comprising a diffusion sheet, disposed on and spaced from the optical layer, a bottom side of the diffusion sheet including a plurality of diffusion dots, the density of the diffusion dots gradually decreasing from the light emitting element to outward.
12 . The light emitting module of claim 11 , further comprising an optical glue, covering an outer side of the packaging layer.
13 . The light emitting module of claim 12 , wherein the optical glue includes a spacing groove corresponding to a region having a lower density of the diffusion dots.
14 . The light emitting module of claim 12 , wherein the optical glue extends upwardly to cover the optical layer, and the upper surface of the optical glue includes a plurality of microstructures.

Description

FIELD OF THE INVENTION The present application relates to a light-emitting module, and more particularly to a light-emitting module with uniform light emission. BACKGROUND OF THE INVENTION A light-emitting diode (LED) is a semiconductor element that generates light by using a p-n junction structure of a semiconductor structure. The generated light is generated by the recombination of minority carriers (electrons or holes) injected into the semiconductor. In the past technologies, LEDs could only emit red and green light, which limited their use to display elements. However, with the development of technology, LEDs may emit light in a variety of wavelength ranges in addition to red and green light. This makes it be possible to use LEDs in a variety of different fields. In particular, when white light emission is achieved, the fields of applications of LEDs are expanded to include lighting elements and backlights for liquid crystal displays. This technological advancement has led to LEDs of a variety of colors, which not only provide a wider range of choices, but also change the standards of many industries. LEDs are now widely used in a variety of fields, including home lighting, commercial lighting, automotive lighting, and display technology and so on. LEDs provide high efficiency, durability, and energy-saving characteristics to make LEDs be one of the mainstreams in today's lighting and display technologies. In the applications of displays, indirect lighting, and advertising boards, LEDs are arranged to form a surface light source, which is used as a backlight. However, in the conventional surface light source, the light generated by a single LED chip is usually emitted upward more than outward, and when the LED chips are combined into an array, a plurality of bright and dark areas are generated, resulting in uneven light distribution. Continued with the above, the uneven light distribution has a negative impact on the display effect or the lighting effect. If the upward emitted light is not properly controlled, the LED array cannot be applied to the case having a requirement of a uniform surface light source. Therefore, in order to overcome the aforementioned problems, the industry needs a structure that may efficiently homogenize the light emitted by a single LED. In view of the above problems of the conventional technology, the present application provides a light-emitting module, which adjusts the distribution of a central light by a reflective surface of a packaging layer and an optical layer and adjusts the distribution of peripheral light by an inclined surface around the packaging layer, so that the light-emitting module has a homogeneous light distribution. SUMMARY An objective according to the present application is to provide a light-emitting module, which includes a packaging layer covering a light-emitting element, an upper surface of the packaging layer has a reflective surface recessed downward, an outer side of the packaging layer includes two inclined surfaces, and an optical layer filled on the upper surface of the packaging layer. The reflective surface and the optical layer adjust the distribution of central lights, and the two inclined surfaces adjust the distribution of peripheral lights, so that the light-emitting module has a homogeneous light distribution and further improves the uniformity of the light source. In order to overcoming aforementioned problem and achieving aforementioned objective, the present application provides a light-emitting module, which comprises a substrate, a light-emitting element, a packaging layer, and an optical layer. The light-emitting element is disposed on the substrate. The packaging layer is also disposed on the substrate, and covers the light-emitting element. An outer side of the packaging layer includes a first inclined surface and a second inclined surface from bottom to top. the first inclined surface is extended upward to form the second inclined surface while an upper portion of the first inclined surface is connected with a bottom portion of the second inclined surface. An upper surface of the packaging layer is recessed downwardly corresponding to the light-emitting element. The optical layer is disposed on the upper surface of the packaging layer and extended along the upper surface of the packaging layer to form at least one first reflective surface. A first angle of the first inclined surface is different from a second angle of the second inclined surface. The at least one first reflective surface is disposed at a third angle. Thereby, this structure of the present application provides a light-emitting module with a homogeneous light distribution. In an embodiment of the present application, wherein a bottom of the substrate includes two electrodes electrically connected to the light-emitting element. In an embodiment of the application, wherein the light emitting element emits a first light, the first light is emitted to the first in