TWI812239B - Light-emitting module - Google Patents

Abstract

A light-emitting module including a light transmissive substrate, at least one light transmissive filling unit, and at least one light-emitting device. The light transmissive substrate includes a disposition plane and a light output surface. The light transmissive substrate has at least one rod-shaped recess. The rod-shaped recess sags from the disposition plane towards the light output surface. The at least one light transmissive filling unit is correspondingly filled in the at least one rod-shaped recess. The at least one light-emitting device is disposed on the disposition plane and correspondingly disposed on the at least one light transmissive filling unit. A surface of the at least one light transmissive filling unit facing away from the at least one light-emitting device is a plane or a concave surface.

Description

Light module

The invention relates to a light emitting module.

The output light shape of micro light-emitting diodes (micro-LEDs) has a huge impact on the optical design of the entire device. When used in different devices, in order to meet special requirements, the output light shape needs to be a specific shape. For example, in a display device, in order to increase the brightness, the light from the light source needs to be shaped into collimated light. In lighting devices, in order to make the brightness uniform, the light shape is adjusted to be evenly distributed. In current optical devices, other optical elements, such as adding lenses, etc., or adding optical structures can be used to achieve the purpose of light shape modulation.

There are several main methods to achieve output light shape modulation with current technology. Applied to large optical paths, multiple moving parts can be used, such as mirrors, lenses, spatial filters, etc. Its advantage is that it is easy to adjust, and it is conducive to using the optical path as the experimental object for stage testing in the early stages of component development. However, the disadvantage is that the size is too large for LED applications, and large lights are easily affected by other environmental factors, such as dust, external light sources, etc. Alternatively, the large optical path can be miniaturized to reduce the size of the system while retaining its ability to change the light shape, or microstructures can be added to component manufacturing. However, current technology requires the use of multiple optical components, or the design is complex and the manufacturing process is cumbersome, making it difficult to adjust the light shape.

The "prior art" paragraph is only used to help understand the content of the present invention. Therefore, the content disclosed in the "prior art" paragraph may contain some conventional technologies that do not constitute common knowledge to those with ordinary knowledge in the technical field. The content disclosed in the "Prior Art" paragraph does not mean that the content or the problems to be solved by one or more embodiments of the present invention have been known or recognized by those with ordinary knowledge in the technical field before the application of the present invention.

The present invention provides a light-emitting module that can achieve modulation of various light shapes through a simple structure and has the advantage of high manufacturing yield.

Other objects and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

In order to achieve one, part or all of the above objects or other objects, embodiments of the present invention provide a light-emitting module including a light-transmitting substrate, at least one light-transmitting filling unit and at least one light-emitting element. The light-transmitting substrate includes a setting plane and a light-emitting surface, and the light-transmitting substrate has at least one columnar depression. The at least one columnar recess is recessed in a direction from the installation plane toward the light-emitting surface. The at least one light-transmitting filling unit is correspondingly filled in the at least one columnar depression. The at least one light-emitting element is disposed on the arrangement plane and is correspondingly arranged on the at least one light-transmitting filling unit, wherein the surface of the at least one light-transmitting filling unit facing away from the at least one light-emitting element is flat or concave. Each of the at least one light-emitting element has a projection range of the light-emitting element on the installation plane, and each of the at least one light-transmitting filling unit has a projection range of the light-transmitting unit on the installation plane, wherein the geometric center of the projection range of the at least one light-emitting element is consistent with the corresponding The geometric centers of the projection range of at least one light-transmitting unit overlap.

In an embodiment of the present invention, at least one columnar recess is a plurality of recesses arranged in an array, at least one light-transmitting filling unit is a plurality of light-transmitting filling units arranged in an array corresponding to the recesses, and at least one light-emitting unit is arranged in an array. The element is a plurality of light-emitting elements arranged in an array corresponding to these light-transmitting filling units.

In an embodiment of the present invention, the refractive index of the light-transmitting filling unit is smaller than the refractive index of the light-transmitting substrate.

In one embodiment of the present invention, the light-emitting module further includes a buffer layer disposed between at least one light-transmitting filling unit and at least one light-emitting element, and the refractive index of the buffer layer is greater than or equal to the refractive index of the light-transmitting substrate.

In an embodiment of the present invention, the refractive index of at least one light-transmissive filling unit falls in the range of 1.0 to 1.8, the refractive index of the light-transmissive substrate falls in the range of 1.5 to 2.0, and the refractive index of the buffer layer falls in the range of 1.0 to 1.8. Within the range of 1.5 to 3.5.

In one embodiment of the present invention, the light-emitting module further includes at least one quantum dot layer, which is disposed on the light exit surface of the light-transmitting substrate and is disposed corresponding to at least one light-emitting element. The refractive index of the quantum dot layer falls between 1.2 and Within the range of 1.8.

In an embodiment of the present invention, at least one columnar depression is a cylindrical depression or a polygonal columnar depression.

In an embodiment of the present invention, the material of at least one light-transmitting filling unit is polymer.

In an embodiment of the present invention, the outer diameter of at least one light-transmitting filling unit is greater than or equal to the outer diameter of at least one light-emitting element.

In an embodiment of the present invention, the top surface of the at least one light-transmitting filling unit is coplanar with the arrangement plane, and the height of the at least one light-transmitting filling unit falls within the range of 0.1 micron to 30 micron.

In the light-emitting module according to the embodiment of the present invention, since the light-transmitting substrate has columnar recesses, and the light-transmitting filling units are correspondingly filled in the columnar recesses, the process accuracy of the light-emitting module is easier to control and has higher quality. Rate. In addition, in the light-emitting module according to the embodiment of the present invention, the refractive index or material of the light-transmitting substrate, the light-transmitting filling unit or other optical film layers can be adjusted, and by adjusting the curvature of the surface of the light-transmitting filling unit, To achieve the modulation of various light shapes.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings.

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. Directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only for reference to the directions in the attached drawings. Accordingly, the directional terms used are illustrative and not limiting of the invention.

FIG. 1A is a partial cross-sectional schematic view of a light-emitting module according to an embodiment of the present invention, and FIG. 1B is a top view of the light-emitting module of FIG. 1A . Please refer to FIGS. 1A and 1B . The light-emitting module 100 of this embodiment includes a light-transmitting substrate 110 , at least one light-transmitting filling unit 120 (in FIG. 1A , multiple light-transmitting filling units 120 are used as an example), and at least one light-emitting element. 200 (in FIG. 1A , multiple light-emitting elements 200 are taken as an example), the number of at least one light-transmitting filling unit 120 and the number of at least one light-emitting element 200 are, for example, the same. The light-transmitting substrate 110 includes a setting plane 112 and a light-emitting surface 114, and the setting plane 112 and the light-emitting surface 114 are opposite to each other. The light-transmitting substrate 110 has at least one columnar depression 116 (in FIG. 1A , multiple columnar depressions 116 are taken as an example). The columnar recess 116 is recessed in a direction from the installation plane 112 toward the light emitting surface 114 . The light-transmitting filling unit 120 is correspondingly filled in the columnar depression 116 . In this embodiment, the light-transmitting filling unit 120 fills the columnar depression 116 , which means that the projection area of the light-transmitting filling unit 120 on the setting plane 112 overlaps with the projection area of the corresponding columnar depression 116 on the setting plane 112 and has the same area. .

The light-emitting element 200 is disposed on one side of the arrangement plane 112 and is correspondingly disposed on the light-transmitting filling unit 120 . In this embodiment, the surface 122 of the light-transmitting filling unit 120 facing away from the light-emitting element 200 is a concave surface. Since the light-transmitting filling unit 120 is filled in the columnar depression 116 , the shape of the surface 122 of the light-transmitting filling unit 120 is the same as the shape of the bottom of the columnar depression 116 . In another embodiment, as shown in FIG. 2 , the surface 122b of the light-transmitting filling unit 120b of the light-emitting module 100b facing away from the light-emitting element 200 may also be a plane. In this embodiment, each light-emitting element 200 has a light-emitting element projection range A1 (i.e., orthographic projection range) on the installation plane 112 , and each light-transmitting filling unit 120 has a light-transmitting unit projection range A2 (i.e., orthographic projection range) on the installation plane 112 . range), where the geometric center C1 of the light-emitting element projection range A1 overlaps with the geometric center C2 of the corresponding light-transmitting unit projection range A2, where the overlap here refers to complete overlap (i.e. coincidence) or the difference between the two is the light-emitting element projection Within 5% of the width of range A1.

In this embodiment, the light-emitting element 200 is, for example, a micro light-emitting diode, which may include a first-type semiconductor layer 210, a light-emitting layer 220, a second-type semiconductor layer 230, a transparent conductive layer 240, a first electrode 250, a second Electrode 260, insulating layer 270 and reflective layer 280. The first-type semiconductor layer 210 is disposed on the light-transmitting filling unit 120, the luminescent layer 220 is disposed on the first-type semiconductor layer 210, the second-type semiconductor layer 230 is disposed on the luminescent layer 220, and the transparent conductive layer 240 is disposed on the second-type semiconductor layer 210. On the semiconductor layer 230, the first electrode 250 is electrically connected to the first-type semiconductor layer 210, and the second electrode 260 is electrically connected to the second-type semiconductor layer 230 through the transparent conductive layer 240. The reflective layer 280 covers the side surfaces of each semiconductor layer and part of the top surface of the transparent conductive layer 240 , while the insulating layer 270 separates each semiconductor layer and the reflective layer 280 , and separates the transparent conductive layer 240 and the reflective layer 280 . In this embodiment, the light-emitting module 100 further includes a buffer layer 130 disposed between the light-transmitting filling unit 120 and the light-emitting element 200 . In this embodiment, the first type is N type, and the second type is P type. However, in other embodiments, the first type may be P type and the second type may be N type. The light-emitting layer 220 is, for example, a quantum well layer or a multiple quantum well layer. The materials of the first-type semiconductor layer 210, the light-emitting layer 220 and the second-type semiconductor layer 230 may be Group III-V semiconductors, Group II-VI semiconductors or other appropriate semiconductors. In this embodiment, the first-type semiconductor layer 210 is, for example, an N-type gallium nitride layer, and the second-type semiconductor layer 230 is, for example, a P-type gallium nitride layer, but the invention is not limited thereto. In addition, the transparent conductive layer 240 is made of, for example, indium tin oxide or other appropriate transparent conductive materials.

When a forward voltage is applied to the first electrode 250 and the second electrode 260, the light-emitting layer emits light 222. Part of the light 222 will be emitted downward in FIG. 1A , while the other part of the light 222 emitted upward or in other directions will be reflected downward by the reflective layer 280 . Therefore, the light 222 will pass through the buffer layer 130 and the light-transmitting filling unit 120 After being refracted by the light-transmitting substrate 110 , the light emitted from the light-emitting surface 114 of the light-transmitting substrate 110 .

In the light-emitting module 100 of this embodiment, since the light-transmitting substrate 110 has the columnar recess 116, and the light-transmitting filling unit 120 is correspondingly filled in the columnar recess 116, the process accuracy of the light-emitting module 100 is easier to control, and has Higher yield. For example, the columnar recess 116 can be formed by a semiconductor process (such as a photolithography process), and the semiconductor process has the advantage of high precision. After the light-transmitting filling unit 120 is filled in the columnar recess 116, it can ensure light transmission. High accuracy in the position and shape of the filling unit 120. Therefore, the light emitting module 100 can have a higher yield. Compared with the process of attaching the lens array to the micro light-emitting diode, which is risky and prone to inaccurate alignment, this embodiment uses a semiconductor process to form the columnar depression 116, and then fills the light-transmitting filling unit 120. In the columnar recess 116, the process risk of inaccurate alignment can be avoided. In addition, this embodiment is manufactured through a semiconductor process, and the process and structural design are relatively simple, making it an easier technology to implement.

In addition, in the light-emitting module 100 of this embodiment, the refractive index or material of the light-transmitting substrate 110, the light-transmitting filling unit 120 or other optical film layers (such as the buffer layer 130) can be adjusted, and the light transmission can be adjusted. The curvature of the surface 122 of the filling unit 120 is used to achieve various light shape modulations, such as adjusting a uniform light shape for lighting, or adjusting it to a collimated or relatively concentrated light shape for display.

In this embodiment, the at least one columnar depression 116 is a plurality of depressions arranged in an array (as shown in FIG. 1B , the number of the columnar depressions 116 is 6 and arranged in a 2×3 array). The light-transmitting filling units 120 are a plurality of light-transmitting filling units 120 arranged in an array corresponding to the recesses, and the at least one light-emitting element 200 is a plurality of light-emitting elements 200 arranged in an array corresponding to the light-transmitting filling units 120, As shown in Figure 1A and Figure 1B. In this embodiment, the cylindrical recess 116 is a cylindrical recess, the top view of which is the top view of the light-transmitting filling unit 120 as shown in FIG. 1B . However, in another embodiment, as shown in FIG. 1C , the columnar recess 116 a may be a polygonal columnar recess, for example, a square columnar recess in FIG. 1C , the top view of which is light-transmitting as shown in FIG. 1C Top view of filling unit 120a. In addition, in the embodiments of FIG. 1B and FIG. 1C , the top view of the light-emitting element 200 is a polygon (such as a square). However, in other embodiments, the top view of the light-emitting element 200 can also be circular or other shapes. Proper geometry. In addition, the top view of the columnar depression 116 may also be of other appropriate geometric shapes.

In this embodiment, the outer diameter D2 of the light-transmitting filling unit 120 is greater than or equal to the outer diameter D1 of the light-emitting element 200 . The outer diameter D2 of the light-transmitting filling unit 120 is, for example, the diameter of the light-transmitting filling unit 120 . The diameter D1 is, for example, the maximum width of the light emitting element 200 . That is to say, the light-emitting element projection range A1 of the light-emitting element 200 completely falls within the light-transmitting unit projection range A2 of the light-transmitting filling unit 120 . Therefore, the light-transmitting filling unit 120 can fully receive the light 222 from the light-emitting element 200. In other embodiments, if limited by process conditions, the light-emitting element projection range A1 of the light-emitting element 200 may partially fall within the light-transmitting unit projection range A2 of the light-transmitting filling unit 120, where the partial area where the two overlap is at least luminescent. The component projection range covers more than 90% of the A1 area. Furthermore, in this embodiment, the light-transmitting filling unit 120 has a top surface 124, and the top surface 124 and the surface 122 of the light-transmitting filling unit 120 are opposite to each other. The top surface 124 of the light-transmitting filling unit 120 is coplanar with the setting plane 112, and the height H1 of the light-transmitting filling unit 120 falls in the range of 0.1 microns to 30 microns, where the direction of the height H1 is perpendicular to the setting plane 112. H1 is, for example, smaller than the thickness of the light-transmitting substrate 110 (thickness in the direction perpendicular to the installation plane 112 ).

In this embodiment, the refractive index of the light-transmitting filling unit 120 must be smaller than the refractive index of the light-transmitting substrate 110. Therefore, when the light 222 passes through the surface 122 of the light-transmitting filling unit 120, it will be equivalent to passing through the convex surface of a convex lens, so that The light 222 is concentrated to achieve a more concentrated or collimated light shape. In one embodiment, the material of the light-transmitting filling unit 120 is a polymer, such as polymethylmethacrylate or other appropriate light-transmitting polymers. In addition, in this embodiment, the refractive index of the buffer layer 130 needs to be greater than or equal to the refractive index of the light-transmitting substrate 110 . In this embodiment, the refractive index of the light-transmitting filling unit 120 falls in the range of 1 to 1.8, the refractive index of the light-transmitting substrate 110 falls in the range of 1.5 to 2.0, and the refractive index of the buffer layer 130 falls in the range of 1.5 to 1.5. Within the range of 3.5.

In this embodiment, the light-emitting module 100 further includes at least one quantum dot layer 140 (a plurality of quantum dot layers 140 are used as an example in FIG. 1A ), which is disposed on the light-emitting surface 114 of the light-transmitting substrate 110 and is connected with the light-emitting surface 114 . Component 200 corresponds to the configuration. The quantum dot layer 140 can convert the wavelength of the light 222 emitted by the light emitting element 200 into different wavelengths. When the light-emitting module 100 is a display panel, the quantum dot layer 140 can have multiple (for example, three) different quantum dot material layers, and each light-emitting element 200 can be regarded as a sub-pixel, and multiple different quantum dot material layers Convert the light 222 of the sub-pixels into light of different wavelengths (ie, different colors). However, when the light-emitting module 100 is a lighting module, the quantum dot layer 140 can have only one quantum dot material layer, and the quantum dot layer 140 can also be continuously distributed on the light-emitting surface 114 to absorb the light emitted by the light-emitting element 200. 222 is converted into a certain color of light. In this embodiment, the refractive index of the quantum dot layer 140 falls within the range of 1.2 to 1.8.

3A to 3F show the light of the light-emitting module of FIG. 1A when the curvature radius of the surface of the light-transmitting filling unit facing away from the light-emitting element is 1000 microns, 100 microns, 70 microns, 60 microns, 50 microns and 40 microns respectively. A plot of intensity versus viewing angle. Please refer to Figure 1A and Figure 3A to Figure 3F. In Figure 3A to Figure 3F, 0 degrees means directly above Figure 1A, 180 degrees means directly below Figure 1A, the radius direction is the light intensity, the first type semiconductor layer The area ratio of the upper surface to the lower surface of 210 is 0.77, the refractive index of the buffer layer 130 is 3.5, the material of the light-transmitting filling unit 120 is polymethylmethacrylate, the refractive index of the light-transmitting substrate 110 is 1.5, and the quantum dots The refractive index of layer 140 is 1.5. It can be seen from Figures 3A to 3F that when the radius of curvature of the surface 122 is larger, the output energy becomes more uniform. If the radius of curvature of the surface 122 is slightly reduced, it can be found that the light energy distribution will be toward the middle (i.e., directly below Figure 1A) Slightly more concentrated. In addition, the light efficiency of the light emitting module 100 of FIG. 3A to FIG. 3F is 0.646. It can be seen that the light emitting module 100 of this embodiment does not sacrifice light efficiency when adjusting the light shape.

4A to 4B are distribution diagrams of light intensity versus viewing angle under two different parameters of the light-emitting module in FIG. 1A . Please refer to FIGS. 4A to 4B . In FIGS. 4A to 4B , 0 degrees refers to the direction directly above FIG. 1A , 180 degrees refers to the direction directly below FIG. 1A , the radius direction refers to the light intensity, and the upper surface of the first type semiconductor layer 210 The area ratio between the surface and the lower surface is 0.77, the refractive index of the buffer layer 130 is 3.5, the material of the light-transmitting filling unit 120 in Figures 4A and 4B is polymethyl methacrylate, and the radius of curvature of the surface 122 is 1000 microns. Figure The refractive index of the light-transmitting substrate 110 of FIG. 4A is 1.0, the refractive index of the light-transmitting substrate 110 of FIG. 4B is 1.5, and the refractive index of the quantum dot layer 140 of FIG. 4A and FIG. 4B is 1.5. In addition, the light efficiency of the light emitting module 100 of FIG. 4A is 0.517, and the light efficiency of the light emitting module 100 of FIG. 4B is 0.646. When the refractive index of the light-transmitting substrate 110 is low, the light energy distribution has a high concentration, and its light shape is close to a collimated light shape. Such a light shape is conducive to the light 222 leaving the light-emitting element 200 and entering the quantum dot layer 140 , thereby improving light efficiency. For different materials of the quantum dot layer 140, due to the different refractive index of the quantum dot layer 140, the shape of the surface 122 of the light-transmitting filling unit 120, the refractive index of the light-transmitting filling unit 120 and the refractive index of the light-transmitting substrate 110 may also be different. different.

5A to 5D are distribution diagrams of light intensity versus viewing angle in the buffer layer and light-transmitting filling unit of the light-emitting module of FIG. 1A under four different refractive indexes. Please refer to Figures 5A to 5D. In Figures 5A to 5D, 0 degrees refers to directly above Figure 1A, 180 degrees refers to directly below Figure 1A, the radius direction is the light intensity, the buffer layer 130 of Figure 5A and the transparent The refractive index of the light filling unit 120 is both 1.5, the refractive index of the buffer layer 130 and the light-transmitting filling unit 120 of Figure 5B is 2.0, the refractive index of the buffer layer 130 and the light-transmitting filling unit 120 of Figure 5C is both 2.5, and The refractive index of the buffer layer 130 and the light-transmitting filling unit 120 in Figure 5D is both 3.0. The design of the first-type semiconductor layer 210, the surface 122, the light-transmitting substrate 110 and the quantum dot layer 140 is the same as the embodiment of Figure 4B. The light efficiency of the light emitting module 100 of Figure 5A is 0.708, the light efficiency of the light emitting module 100 of Figure 5B is 0.786, the light efficiency of the light emitting module 100 of Figure 5C is 0.665, and the light efficiency of the light emitting module 100 of Figure 5D is 0.708. Comparing FIGS. 4A to 4B and FIGS. 5A to 5D , it can be seen that when the refractive index of the buffer layer 130 and the light-transmitting filling unit 120 are the same, the light efficiency is higher, and when the refractive index of both is 1.5, the output light shape To be uniform.

FIG. 6A is a distribution diagram of the light intensity of the control group of the light-emitting module with respect to the viewing angle, and FIG. 6B is a distribution diagram of the light-emitting module of FIG. 1A with respect to the viewing angle. The light-transmitting substrate of the control group in Figure 6A does not have the columnar recess 116 of Figure 1A, and the control group does not have the light-transmitting filling unit 120 of Figure 1A. That is, the control group uses a flat light-transmitting substrate, and the remaining film layers and parameters are the same as the light-emitting module 100 of FIG. 1A . In the control group and the light-emitting module 100 of FIGS. 6A and 6B , 0 degrees refers to directly above in FIG. 1A , 180 degrees refers to directly below in FIG. 1A , the radius direction is the light intensity, and the upper surface of the first-type semiconductor layer 210 The area ratio between the surface and the lower surface is 0.77, the refractive index of the buffer layer 130 is 3.5, the material of the light-transmitting filling unit 120 is polymethylmethacrylate, the refractive index of the light-transmitting substrate 110 is 1.5, and the quantum dot layer 140 The refractive index is 1.5. Comparing FIG. 6A and FIG. 6B , it can be seen that the use of columnar recesses 116 and light-transmitting filling units 120 can indeed improve the output light shape.

To sum up, in the light-emitting module according to the embodiment of the present invention, since the light-transmitting substrate has columnar depressions, and the light-transmitting filling units are correspondingly filled in the columnar depressions, the process accuracy of the light-emitting module is easier to control. Has a higher yield. In addition, in the light-emitting module according to the embodiment of the present invention, the refractive index or material of the light-transmitting substrate, the light-transmitting filling unit or other optical film layers can be adjusted, and by adjusting the curvature of the surface of the light-transmitting filling unit, To achieve the modulation of various light shapes.

However, the above are only preferred embodiments of the present invention, and should not be used to limit the scope of the present invention. That is, any simple equivalent changes and modifications made in accordance with the patent scope of the present invention and the description of the invention, All are still within the scope of the patent of this invention. In addition, any embodiment or patentable scope of the present invention does not need to achieve all the purposes, advantages or features disclosed in the present invention. In addition, the abstract section and title are only used to assist in searching patent documents and are not intended to limit the scope of the invention. In addition, terms such as “first” and “second” mentioned in this specification or the scope of the patent application are only used to name elements or to distinguish different embodiments or scopes, and are not used to limit the number of elements. upper or lower limit.

100, 100b: Light emitting module 110: Translucent substrate 112:Set plane 114: Shiny surface 116, 116a: columnar depression 120, 120a: Translucent filling unit 122, 122b: Surface 124:Top surface 130:Buffer layer 140:Quantum dot layer 200:Light-emitting components 210: First type semiconductor layer 220: Luminous layer 222:Light 230: Second type semiconductor layer 240:Transparent conductive layer 250: first electrode 260: Second electrode 270:Insulation layer 280: Reflective layer A1: Projection range of light-emitting elements A2: Projection range of light-transmitting unit C1, C2: geometric center D1, D2: outer diameter H1: height

1A is a partial cross-sectional schematic diagram of a light-emitting module according to an embodiment of the present invention. Figure 1B is a schematic top view of the light emitting module of Figure 1A. FIG. 1C is a schematic top view of a light-emitting module according to another embodiment. Figure 2 is a partial cross-sectional schematic view of a light-emitting module according to another embodiment of the present invention. 3A to 3F show the light-emitting module of FIG. 1A when the curvature radius of the surface 122 of the light-transmitting filling unit facing away from the light-emitting element is 1000 microns, 100 microns, 70 microns, 60 microns, 50 microns and 40 microns respectively. A plot of light intensity versus viewing angle. 4A to 4B are distribution diagrams of light intensity versus viewing angle under three different parameters of the light-emitting module in FIG. 1A . 5A to 5D are distribution diagrams of light intensity versus viewing angle in the buffer layer and light-transmitting filling unit of the light-emitting module of FIG. 1A under four different refractive indexes. FIG. 6A is a distribution diagram of light intensity versus viewing angle of the control group of the light-emitting module. FIG. 6B is a distribution diagram of the light-emitting module of FIG. 1A with respect to the viewing angle.

100:Light-emitting module

110: Translucent substrate

112:Set plane

114: Shiny surface

116: Columnar depression

120: Translucent filling unit

122:Surface

124:Top surface

130:Buffer layer

140:Quantum dot layer

200:Light-emitting components

210: First type semiconductor layer

220: Luminous layer

222:Light

230: Second type semiconductor layer

240:Transparent conductive layer

250: first electrode

260: Second electrode

270:Insulation layer

280: Reflective layer

A1: Projection range of light-emitting elements

A2: Projection range of light-transmitting unit

C1, C2: geometric center

D1, D2: outer diameter

H1: height

Claims (10)

A light-emitting module includes: a light-transmitting substrate, including a setting plane and a light-emitting surface; the light-transmitting substrate has at least one columnar depression; the at least one columnar depression is recessed from the setting plane toward the light-emitting surface. ; At least one light-transmitting filling unit, correspondingly filled in the at least one columnar depression; and at least one light-emitting element, arranged on one side of the arrangement plane, and correspondingly arranged on the at least one light-transmitting filling unit, wherein the at least one light-transmitting filling unit The surface of a light-transmitting filling unit facing away from the at least one light-emitting element is a plane or a concave surface. Each of the at least one light-emitting element has a light-emitting element projection range on the arrangement plane. Each of the at least one light-transmitting filling unit has a projection range on the arrangement plane. The plane has a projection range of the light-transmitting unit, wherein the geometric center of the projection range of the at least one light-emitting element overlaps with the corresponding geometric center of the projection range of the at least one light-transmitting unit. The light-emitting module of claim 1, wherein the at least one columnar recess is a plurality of recesses arranged in an array, and the at least one light-transmitting filling unit is a plurality of light-transmitting filling units arranged in an array corresponding to the recesses. unit, and the at least one light-emitting element is a plurality of light-emitting elements arranged in an array corresponding to the light-transmitting filling units. The light-emitting module of claim 1, wherein the refractive index of the at least one light-transmitting filling unit is smaller than the refractive index of the light-transmitting substrate. The light-emitting module as claimed in claim 1, wherein the light-emitting module further includes: A buffer layer is disposed between the at least one light-transmitting filling unit and the at least one light-emitting element, and the refractive index of the buffer layer is greater than or equal to the refractive index of the light-transmitting substrate. The light-emitting module of claim 4, wherein the refractive index of the at least one light-transmitting filling unit falls in the range of 1.0 to 1.8, the refractive index of the light-transmitting substrate falls in the range of 1.5 to 2.0, and the buffer The refractive index of the layer falls in the range of 1.5 to 3.5. The light-emitting module of claim 1, further comprising at least one quantum dot layer disposed on the light-emitting surface of the light-transmitting substrate and corresponding to the at least one light-emitting element, the refractive index of the quantum dot layer falling In the range of 1.2 to 1.8. The light-emitting module of claim 1, wherein the at least one columnar depression is a cylindrical depression or a polygonal columnar depression. The light-emitting module of claim 1, wherein the at least one light-transmitting filling unit is made of polymer. The light-emitting module of claim 1, wherein the outer diameter of the at least one light-transmitting filling unit is greater than or equal to the outer diameter of the at least one light-emitting element. The light-emitting module of claim 1, wherein a top surface of the at least one light-transmitting filling unit is coplanar with the arrangement plane, and the height of the at least one light-transmitting filling unit falls between 0.1 micron and 30 micron. within the range.

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