CN117832359A

CN117832359A - Light-emitting device and display device

Info

Publication number: CN117832359A
Application number: CN202311798600.2A
Authority: CN
Inventors: 庄松涛; 时军朋; 陈清河; 林振端; 余长治; 徐宸科
Original assignee: Hubei San'an Photoelectric Co ltd
Current assignee: Hubei San'an Photoelectric Co ltd
Priority date: 2023-12-25
Filing date: 2023-12-25
Publication date: 2024-04-05

Abstract

The invention discloses a light-emitting device and a display device. Wherein, the first surface of the transparent layer is provided with a first pattern structure. The light emitting elements are arranged above the first surface of the transparent layer at intervals, the light emitting surface of each light emitting element is opposite to the first surface of the transparent layer, and the second pattern structure is arranged on the light emitting surface of each light emitting element. The wiring layer is arranged on the plurality of light-emitting elements and is electrically connected with each light-emitting element. The first pattern structure comprises first protruding portions arranged at intervals, the second pattern structure comprises second protruding portions arranged at intervals, and the ratio of the distance between every two adjacent first protruding portions to the distance between every two adjacent second protruding portions is 0.25-1.5. Thus, the present invention can make light emitted from light emitting elements having different directional angle characteristics from each other emit at a uniform directional angle by means of the pattern structure of the transparent layer, thereby reducing color difference while improving light emitting efficiency of the light emitting elements.

Description

Light-emitting device and display device

Technical Field

The present invention relates to the field of semiconductor devices, and in particular, to a light emitting diode and a light emitting device.

Background

The LED chip is widely used in various fields such as display devices, lamps for vehicles, general illumination lamps, etc. due to its characteristics of high reliability, long lifetime, and low power consumption, for example, the LED chip can be used as a backlight source for various display devices.

Micro LEDs have received great attention as the most advantageous new generation of display technology, especially in the field of high resolution, small pitch displays. At present, micro LEDs are generally packaged to form unit pixels to facilitate subsequent fabrication of display devices. However, due to the limitation of the structure of the unit pixel itself, the internal total reflection phenomenon is unavoidable. In the prior art, surface texturing is generally performed on the light emitting surface of the light emitting element in the unit pixel, so as to reduce total reflection inside the chip structure and increase light extraction efficiency. However, when the Micro LED is packaged as a unit pixel, there is still a case where the light emission intensity is lowered due to unreasonable arrangement inside the unit pixel package, and the light emission efficiency is affected.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a light emitting device and a display device, so as to improve the light emitting efficiency of the light emitting device or the display device.

To achieve the above and other related objects, the present invention provides a light emitting device comprising:

the transparent layer comprises a first surface and a second surface which are oppositely arranged, and a first graph structure is arranged on the first surface of the transparent layer;

the light emitting elements are arranged above the first surface of the transparent layer at intervals, the light emitting surface of each light emitting element is opposite to the first surface of the transparent layer, and a second pattern structure is arranged on the light emitting surface of each light emitting element;

the wiring layer is arranged on the plurality of light-emitting elements and is electrically connected with each light-emitting element;

the first pattern structure comprises first protruding portions arranged at intervals, the second pattern structure comprises second protruding portions arranged at intervals, and the ratio of the distance between every two adjacent first protruding portions to the distance between every two adjacent second protruding portions is 0.25-1.5.

According to an aspect of the present invention, there is also provided a display device including:

a display substrate;

at least one light emitting device is arranged on the surface of the display substrate, the light emitting device is electrically connected with the display substrate, and the light emitting device is the light emitting device.

Compared with the prior art, the light-emitting device and the display device have at least the following beneficial effects:

the light-emitting device includes a transparent layer, a plurality of light-emitting elements, and a wiring layer. The transparent layer comprises a first surface and a second surface which are oppositely arranged, and a first pattern structure is arranged on the first surface of the transparent layer. The light emitting elements are arranged above the first surface of the transparent layer at intervals, the light emitting surface of each light emitting element is opposite to the first surface of the transparent layer, and the second pattern structure is arranged on the light emitting surface of each light emitting element. The wiring layer is arranged on the plurality of light-emitting elements and is electrically connected with each light-emitting element. The first pattern structure comprises first protruding portions arranged at intervals, the second pattern structure comprises second protruding portions arranged at intervals, and the ratio of the distance between every two adjacent first protruding portions to the distance between every two adjacent second protruding portions is 0.25-1.5. Therefore, the light emitted from the light emitting elements with different directional angle characteristics in the light emitting device is emitted at a uniform directional angle through the pattern structure of the transparent layer, so that the color difference is reduced, and the light emitting efficiency of the light emitting element can be improved through the arrangement of the pattern structures on the light emitting element and the transparent layer, and the light emitting device has a brightening effect.

The display device comprises the upper light-emitting device, and has the technical effects.

Drawings

Fig. 1 is a schematic top view of a light emitting diode according to embodiment 1 of the present invention;

FIG. 2 is a schematic cross-sectional view taken along the direction A-A' in FIG. 1;

FIG. 3 is an enlarged view at B in FIG. 2;

FIG. 4 is an enlarged view of an example of embodiment 1 of the present invention at B in FIG. 2;

FIG. 5 is an enlarged view of an example of embodiment 1 of the present invention at B in FIG. 2;

FIG. 6 is an enlarged view of an example of embodiment 1 of the present invention at B in FIG. 2;

FIG. 7 is an enlarged view of an example of embodiment 1 of the present invention at B in FIG. 2;

FIG. 8 is an enlarged view of an example of embodiment 1 of the present invention at B in FIG. 2;

FIG. 9 is an enlarged view of an example of embodiment 1 of the present invention at B in FIG. 2;

FIG. 10 is an enlarged view of an example of embodiment 1 of the present invention at B in FIG. 2;

FIG. 11 is an enlarged view of an example of embodiment 1 of the present invention at B in FIG. 2;

fig. 12 is a schematic structural diagram of a display device in embodiment 2 of the present invention.

List of reference numerals:

100. transparent layer

110. A first surface

120. A second surface

101. First graphic structure

1011. A first protruding part

200. Adhesive layer

310. First light-emitting element

311. Second pattern structure

3111. Second protruding part

320. Second light-emitting element

330. Third light-emitting element

301. Light-emitting surface

400. Filling layer

500. Wiring layer

501. First layer

502. Second layer

600. Protective electrode

700. Insulating layer

001. Display substrate

002. Light emitting device

Detailed Description

Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples. The invention may be practiced or carried out in other embodiments and details within the scope and range of equivalents of the specific embodiments and ranges of equivalents, and modifications and variations may be made in the practice of the invention without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.

It should be noted that the illustrations provided in the embodiments of the invention are merely schematic illustrations of the basic concepts of the invention, and only the components related to the invention are shown in the illustrations, rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of each component in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated. The structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure, and should not be construed as limiting the scope of the invention, since any modification, variation in proportions, or adjustment of the structures, proportions, etc. which would otherwise be used by those skilled in the art, should not be construed as limiting the scope of the invention, which is otherwise, used by the claims, without affecting the efficacy of the invention or the objects obtained.

In order to further improve the light-emitting efficiency of the light-emitting device, the present embodiment provides a light-emitting device, including:

the first pattern structure comprises first protruding portions arranged at intervals, the second pattern structure comprises second protruding portions arranged at intervals, and the ratio of the distance between every two adjacent first protruding portions to the distance between every two adjacent second protruding portions is 0.25-1.5. Thus, light emitted from light emitting elements having different directional angle characteristics from each other in the light emitting device is emitted at a uniform directional angle by the pattern structure of the transparent layer, so that color difference can be reduced while light emitting efficiency of the light emitting elements can be improved.

Optionally, the first protruding portions are arranged in an array on the first surface of the transparent layer in a planar hexagonal close-packed mode, and the second protruding portions are arranged in an array on the light emitting surface of the light emitting element in a planar hexagonal close-packed mode, so that the arrangement mode is more beneficial to increasing the light emitting probability.

Alternatively, the cross-sectional area of the first protruding portion in the direction parallel to the transparent layer gradually decreases from an end of the first protruding portion away from the light emitting element toward an end close to the light emitting element.

Alternatively, the first protrusion may have a conical shape, a hemispherical shape, or a truncated cone shape, and each of the three pattern structures may scatter light emitted from the light emitting element to increase the pointing angle, and at the same time, light emitted from the light emitting elements having different pointing angle characteristics from each other may be emitted at a uniform pointing angle by the pattern structure of the transparent layer, thereby reducing chromatic aberration.

Alternatively, the width of the end face of the first protruding portion at the end far from the light emitting element is 1-5 μm, and the height of the first protruding portion in the direction perpendicular to the transparent layer is 1-4 μm.

Optionally, the first protruding part is a round table, the radius of the end surface of one end of the first protruding part far away from the light-emitting element is 1-3 μm, the radius of the cross section of one end of the first protruding part near the light-emitting element is 0.3-1.5 μm, and the height of the first protruding part along the direction vertical to the transparent layer is 1-3 μm; alternatively, the radius of the end surface of the first protruding portion at the end far from the light emitting element is 3 to 6 μm, the radius of the cross section of the end of the first protruding portion near the light emitting element is 2 to 4 μm, and the height of the first protruding portion in the direction perpendicular to the transparent layer is 2 to 4 μm.

Alternatively, the cross-sectional area of the second protruding portion in the direction parallel to the transparent layer gradually decreases from the end of the second protruding portion away from the transparent layer toward the end close to the transparent layer.

Optionally, the second protruding portion is conical, hemispherical or truncated cone, and all three graphic structures can reduce total reflection inside the light-emitting device, so that the light-emitting device has a good brightness enhancement effect, and the conical brightness enhancement effect is optimal.

Optionally, the width of the end face of the end, away from the transparent layer, of the second protruding portion is 1-3 μm, and the height of the second protruding portion in the direction perpendicular to the transparent layer is 1-3 μm.

Optionally, the second protruding part is a round table, the radius of the cross section of one end of the second protruding part far away from the transparent layer is 1-3 μm, the radius of the end surface of one end of the second protruding part near the transparent layer is 0.3-1.5 μm, and the height of the second protruding part along the direction vertical to the transparent layer is 1-3 μm; or the radius of the cross section of one end of the second protruding part far away from the transparent layer is 3-6 mu m, the radius of the end face of one end of the second protruding part near the transparent layer is 2-4 mu m, and the height of the second protruding part along the direction vertical to the transparent layer is 2-4 mu m.

Optionally, the width of the end face of the end of the first protruding portion away from the light emitting element is larger than the width of the end face of the end of the second protruding portion away from the transparent layer, and the height of the first protruding portion along the direction perpendicular to the transparent layer is larger than the height of the second protruding portion along the direction perpendicular to the transparent layer.

Optionally, the ratio of the spacing between adjacent first protrusions to the spacing between adjacent second protrusions is less than 1.

Optionally, the ratio of the space between the adjacent first protruding portions to the space between the adjacent second protruding portions is 0.25, there is a corresponding area between the first pattern structure and the second pattern structure, in the corresponding area, there is a first protruding portion corresponding to each second protruding portion, which does not correspond to the second protruding portion, the first protruding portion can scatter the vertically emergent light, the pointing angle is increased, and meanwhile, the light-emitting efficiency of the light-emitting element is higher.

Optionally, a ratio of a spacing between adjacent first protrusions to a spacing between adjacent second protrusions is 0.5, there is a corresponding region of the first pattern structure and the second pattern structure, and in the corresponding region, the first protrusions and the second protrusions are arranged in a staggered manner, and the first protrusions and the second protrusions are arranged in a staggered manner. As more first bulges and second bulges are arranged in a staggered mode, the scattering path of light is increased, and the light-emitting efficiency is improved.

Optionally, the ratio of the space between the adjacent first protruding parts to the space between the adjacent second protruding parts is 0.75, and there is a corresponding area between the first pattern structure and the second pattern structure, in the corresponding area, the first protruding parts and the second protruding parts are arranged in a staggered mode or are correspondingly arranged, and the first protruding parts and the second protruding parts are arranged in a staggered mode or are arranged in a relative mode, so that a light scattering path can be increased, and the light emitting efficiency of the light emitting element is improved.

Optionally, the spacing between adjacent first protrusions is between 2 and 4 μm, and the spacing between adjacent second protrusions is between 1 and 6 μm.

Optionally, the light emitting device further includes:

an insulating layer covering a portion of the wiring layer and exposing a portion of the wiring layer;

and a protective electrode disposed on the exposed wiring layer.

Optionally, the light emitting device further includes:

and a filling layer disposed between the adjacent light emitting elements to fill the gaps between the adjacent light emitting elements.

Optionally, the wiring layer includes:

the first layer is attached to the light-emitting elements and is electrically connected with each light-emitting element;

and a second layer electrically connected to the first layer.

Optionally, the plurality of light emitting elements includes a first light emitting element, a second light emitting element and a third light emitting element, the first light emitting element is a red light emitting element, the second light emitting element is a green light emitting element, and the third light emitting element is a blue light emitting element.

Optionally, an adhesive layer is disposed between the transparent layer and the light emitting element, and the adhesive layer is a transparent layer.

The present embodiment also provides a display device including:

a display substrate;

The present application is described in detail below with reference to specific embodiments.

Example 1

The present embodiment provides a light emitting device including a transparent layer 100, a plurality of light emitting elements, and a wiring layer 500, referring to fig. 1 and 2.

Specifically, referring to fig. 2, the transparent layer 100 can have a light transmittance of 60% or more in the visible light range. Alternatively, the transparent layer 100 may be a transparent substrate, which may be a light transmissive substrate of PET, glass, quartz, sapphire, transparent ceramic, or the like. The light emitting device needs to have a certain thickness in order to be used by clients, and thus the thickness of the transparent layer 100 is preferably greater than 10 μm, particularly preferably 30 μm to 50 μm, 50 μm to 100 μm, or 100 μm to 300 μm. A plurality of light emitting elements are provided on the surface of the transparent layer 100. The surface of the transparent layer 100 away from the light emitting element is the light emitting surface 301 of the light emitting device, that is, the light emitted from the light emitting element is emitted outwards through the transparent layer 100.

The transparent layer 100 includes a first surface 110 and a second surface 120 disposed opposite each other. The first surface 110 of the transparent layer 100 is provided with a first pattern structure 101, the first pattern structure 101 includes first protrusions 1011 disposed at intervals, the first protrusions 1011 are arranged in an array on the first surface 110 of the transparent layer 100 in a planar hexagonal close-packed manner, and the arrangement is more beneficial to the light emitting of the light emitting element.

Referring to fig. 3, the cross-sectional area of the first boss 1011 in the direction parallel to the transparent layer 100 gradually decreases from one end of the first boss 1011 away from the light emitting element to one end close to the light emitting element. Alternatively, the width of the end face of the first boss 1011 at the end remote from the light emitting element is 1 to 5 μm, and the height of the first boss 1011 in the direction perpendicular to the transparent layer 100 is 1 to 4 μm. The first protruding portion 1011 may be conical, hemispherical or truncated cone, and the three graphic structures can effectively reduce total internal reflection, and have higher brightness, and the three graphic structures are conical, truncated cone and hemispherical from high to low. Wherein the first boss 1011 is conical in shape as shown in fig. 3. The first boss 1011 is hemispherical as shown in fig. 4. The first boss 1011 has a truncated cone shape as shown in fig. 5. When the first boss 1011 is a circular table, the radius of the end face of the first boss 1011 at the end far from the light emitting element is 1 to 3 μm, the radius of the cross section of the first boss 1011 at the end near the light emitting element is 0.3 to 1.5 μm, and the height of the first boss 1011 in the direction perpendicular to the transparent layer 100 is 1 to 3 μm; alternatively, the radius of the end surface of the first boss 1011 at the end far from the light emitting element is 3 to 6 μm, the radius of the cross section of the end of the first boss 1011 near the light emitting element is 2 to 4 μm, and the height of the first boss 1011 in the direction perpendicular to the transparent layer 100 is 2 to 4 μm. The pattern structures of the two circular truncated cone sizes can scatter light emitted from the light emitting elements to increase the pointing angle, and at the same time, can emit light emitted from the light emitting elements having different pointing angle characteristics from each other at a uniform pointing angle by the pattern structure of the transparent layer 100, thereby reducing chromatic aberration.

Referring to fig. 2, a plurality of light emitting elements are spaced above the first surface 110 of the transparent layer 100. The light emitting surface 301 of each light emitting element is opposite to the first surface 110 of the transparent layer 100. Each light emitting element includes a semiconductor stacked layer, which may include a first semiconductor layer, a second semiconductor layer, and an active layer disposed therebetween, which are sequentially arranged, wherein the first semiconductor layer is an N-type semiconductor layer, the second semiconductor layer is a P-type semiconductor layer, and the active layer is a multiple quantum well layer, which may provide radiation of red light or green light or blue light. Each light emitting element further includes an N electrode and a P electrode. The semiconductor stack layer has a mesa exposing the N-type semiconductor layer, an N electrode formed on the mesa and electrically connected to the N-type semiconductor layer, and a P electrode formed on the P-type semiconductor layer and electrically connected to the P-type semiconductor layer. The N-type semiconductor layer, the multiple quantum well layer, the P-type semiconductor layer, the N-electrode and the P-electrode are only basic constituent units of the light emitting element, and on this basis, the light emitting element may further include other functional structure layers having an optimization effect on the performance of the light emitting element, which are not described herein.

In the present embodiment, the plurality of light emitting elements includes a first light emitting element 310, a second light emitting element, and a third light emitting element 330. The first, second and third light emitting elements 310, 330 respectively radiate light of different wavelength ranges, for example, the first light emitting element 310 radiates blue light, the second light emitting element radiates green light, and the third light emitting element 330 radiates red light. The light emitting element in this embodiment mainly refers to a micro-sized light emitting diode having a width or length in a range of 2 to 5 μm, 5 to 10 μm, 10 to 20 μm, 20 to 50 μm or 50 to 100 μm and a thickness in a range of 2 to 15 μm. Since different light emitting elements generally have different thicknesses, by providing the adhesive layer 200 between the transparent layer 100 and the light emitting elements, the material of the adhesive layer 200 may be a material having elasticity such as silicone rubber, and thus, the light emitting elements may be partially sunk into the adhesive layer 200 to maintain the electrode surfaces of the light emitting elements at the same level, and the height difference of the light emitting surfaces 301 of the respective light emitting elements may be reduced, so that light emitted from the side surfaces of the light emitting elements is absorbed by the filling layer 400 described below as much as possible to improve the contrast ratio of the light emitting device. The thickness of the adhesive layer 200 is preferably 1 μm to 15 μm or 3 μm to 10 μm. If the thickness of the adhesive layer 200 is greater than 15 μm, the alignment accuracy of the light emitting element may be affected.

Referring to fig. 3, a second pattern structure 311 is disposed on the light emitting surface 301 of each light emitting element. The second protrusions 3111 are arranged in an array on the light emitting surface 301 of the light emitting element in a planar hexagonal close-packed manner. The cross-sectional area of the second protrusion 3111 in the direction parallel to the transparent layer 100 gradually decreases from an end of the second protrusion 3111 away from the transparent layer 100 toward an end near the transparent layer 100. The second protruding portion 3111 has a conical shape, a hemispherical shape or a truncated cone shape, and all three pattern structures can effectively reduce total internal reflection and have higher brightness. The second protruding portion 3111 is a cone, as shown in fig. 3. The second protrusion 3111 is hemispherical as shown in fig. 4. The second protruding portion 3111 has a truncated cone shape as shown in fig. 5. The three graphic structures are respectively conical, round table and hemispherical from high to low in brightness. The end face of the second protrusion 3111 remote from the transparent layer 100 has a width of 1 to 3 μm, and the second protrusion 3111 has a height of 1 to 3 μm in a direction perpendicular to the transparent layer 100.

Referring to fig. 5, when the second protrusion 3111 is a circular truncated cone, a radius of a cross section of an end of the second protrusion 3111 remote from the transparent layer 100 is 1 to 3 μm, a radius of an end surface of the second protrusion 3111 near the transparent layer 100 is 0.3 to 1.5 μm, and a height of the second protrusion 3111 in a direction perpendicular to the transparent layer 100 is 1 to 3 μm. That is, the radius of the bottom of the round table is 1-3 mu m, the radius of the top of the round table is 0.3-1.5 mu m, and the height of the round table is 1-3 mu m. Alternatively, the second protrusion 3111 has a cross-sectional radius of 3 to 6 μm at an end remote from the transparent layer 100, an end surface radius of 2 to 4 μm at an end of the second protrusion 3111 near the transparent layer 100, and a height of 2 to 4 μm in a direction perpendicular to the transparent layer 100. That is, the radius of the bottom of the round table can be 3-6 mu m, the radius of the top of the round table is 2-4 mu m, and the height of the round table is 2-4 mu m. The sizes of the two circular tables can effectively reduce total internal reflection of the light-emitting device, higher brightness is obtained, and the brightness enhancement effect of the circular table with smaller size is larger than that of the circular table with larger size.

Referring to fig. 3, the relative position and the relative size between the first pattern structure 101 and the second pattern structure 311 also affect the light-emitting efficiency of the entire light-emitting device. Specifically, in the present embodiment, the ratio D1/D2 of the spacing between the adjacent first protrusions 1011 to the spacing between the adjacent second protrusions 3111 is between 0.25 and 1.5, within which the light emitting efficiency of the light emitting device can be increased. Especially, when the ratio of the space between the adjacent first protrusions 1011 to the space between the adjacent second protrusions 3111 is between 0.25 and 0.75, the light emitting effect of the light emitting device is greater than when the ratio D1/D2 of the space between the adjacent first protrusions 1011 to the space between the adjacent second protrusions 3111 is between 1 and 1.5.

For example, referring to fig. 6, the ratio of the pitch between adjacent first protrusions 1011 to the pitch between adjacent second protrusions 3111 is 0.25, and there is a corresponding region where each of the second protrusions 3111 corresponds to one of the first protrusions 1011 between the first pattern structure 101 and the second pattern structure 311. The arrangement density of the first protrusions 1011 is greater than that of the second protrusions 3111, there are no first protrusions 1011 corresponding to the second protrusions 3111, and the first protrusions 1011 can scatter light emitted vertically to increase the pointing angle, and the light emitting efficiency of the light emitting element is higher. Referring to fig. 7, the ratio of the pitch between adjacent first protrusions 1011 to the pitch between adjacent second protrusions 3111 is 0.5, and there is a corresponding region of the first pattern structure 101 and the second pattern structure 311 in which the first protrusions 1011 and the second protrusions 3111 are arranged off-peak. Since there are more first protrusions 1011 and second protrusions 3111 arranged off-peak, the scattering path of light is increased. Meanwhile, the pattern arrangement of the pattern structure on the light-emitting element is more favorable for the light-emitting of the light-emitting element, the effect of brightness enhancement is achieved, and the light-emitting efficiency of the light-emitting device is optimal compared with other spacing proportions under the spacing proportion. Referring to fig. 8, the ratio of the interval between adjacent first protrusions 1011 to the interval between adjacent second protrusions 3111 is 0.75, and there is a corresponding region of the first pattern structure 101 and the second pattern structure 311 in which the first protrusions 1011 and the second protrusions 3111 are arranged off-peak or opposite to each other, and as such, the light scattering path can be increased, and the light emitting efficiency of the light emitting element can be improved.

The brightness enhancement effect is also provided when the ratio D1/D2 of the spacing between the adjacent first protrusions 1011 to the spacing between the adjacent second protrusions 3111 is between 1 and 1.5. For example, referring to fig. 9, the ratio of the pitch between adjacent first protrusions 1011 to the pitch between adjacent second protrusions 3111 is 1, and there is a corresponding region of the first pattern structure 101 and the second pattern structure 311 in which the first protrusions 1011 and the second protrusions 3111 are in one-to-one correspondence. The one-to-one correspondence of the first protrusions 1011 and the second protrusions 3111 can improve the scattering effect to some extent. Referring to fig. 10, the ratio of the pitch between adjacent first protrusions 1011 to the pitch between adjacent second protrusions 3111 is 1.25, and there is a corresponding region of the first pattern structure 101 and the second pattern structure 311 in which the first protrusions 1011 and the second protrusions 3111 are arranged off-peak. The off-peak arrangement of the first protrusions 1011 and the second protrusions 3111 can improve the scattering effect to some extent. Referring to fig. 11, the ratio of the space between adjacent first protrusions 1011 to the space between adjacent second protrusions 3111 is 1.5, and there is a corresponding region of the first pattern structure 101 and the second pattern structure 311 in which the first protrusions 1011 and the second protrusions 3111 are arranged off-peak, so that the scattering effect can be improved to some extent.

The distance D1 between the adjacent first protrusions 1011 is 2 to 4 μm, and the distance D2 between the adjacent second protrusions 3111 is 1 to 6 μm. For example, the distance D1 between adjacent first projections 1011 is 2 μm, 2.5 μm, 3 μm, 4 μm, or the like. The distance D2 between the adjacent second protrusions 3111 is 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm. The first protruding portion 1011 and the second protruding portion 3111 may be any one or a combination of two of a conical shape, a truncated cone shape, and a hemispherical shape, which will not be described in detail herein.

Alternatively, when the size of the first boss 1011 is larger than that of the second boss 3111, the lighting effect of the light emitting device is also facilitated. For example, the end face width of the first protruding portion 1011 at the end far from the light emitting element is larger than the end face width of the second protruding portion 3111 at the end far from the transparent layer 100, and the height of the first protruding portion 1011 in the direction perpendicular to the transparent layer 100 is larger than the height of the second protruding portion 3111 in the direction perpendicular to the transparent layer 100.

A filling layer 400 is disposed between adjacent light emitting elements or around the sidewalls of the light emitting elements, and the filling layer 400 is disposed to prevent color mixing or light interference between the adjacent light emitting elements, thereby improving the contrast of the light emitting device. The filling layer 400 is provided as a black glue layer absorbing light. Specifically, the filling layer 400 may be a member formed by dispersing a black filling component having a particle diameter of not more than 1 μm in a transparent or semitransparent material such as silica gel, epoxy resin, polyimide, low temperature glass, polysiloxane, polysilazane, etc., and the black filling component in the filling layer 400 includes, but is not limited to, carbon black, titanium nitride, iron oxide, ferroferric oxide, iron powder, etc. Black dye may also be used for the filler layer 400.

The wiring layer 500 is disposed above the light emitting elements and the filling layer 400, and is electrically connected to each light emitting element through metal wires therein. The wiring layer 500 includes a plurality of wirings, and the periphery of the wiring layer 500 is filled with an insulating layer 700 to electrically isolate adjacent wirings. The wiring layer 500 may be a single layer or a plurality of layers made of at least one material of titanium, copper, chromium, nickel, gold, platinum, aluminum, titanium nitride, tantalum, or the like. In this embodiment, the wiring layer 500 includes a two-layer structure, specifically, a first layer 501 and a second layer 502, the first layer 501 is in direct contact with the light emitting element, and the second layer 502 is formed on the first layer 501. The first layer 501 is used to adhere the second layer 502 to the light emitting element and the filler layer 400, and the second layer 502 mainly plays a role in electric conduction. The material of the first layer 501 includes, but is not limited to, one or more of titanium, nickel, titanium nitride, tantalum nitride, or tantalum, and the material of the second layer 502 includes, but is not limited to, one or more of copper, aluminum, or gold. The wiring layer 500 may be prepared by sputtering, evaporation, or the like.

The light emitting device further includes an insulating layer 700, and the insulating layer 700 is formed on a portion of the wiring layer 500 to expose a portion of the wiring layer 500. The insulating layer 700 may be formed of epoxy, polysiloxane, or photoresist, and may prevent the wiring layer 500 from being oxidized, electrically isolate different wirings, and prevent the light emitting device from having leakage failure.

The light emitting device further includes a protective electrode 600, the protective electrode 600 being disposed on the exposed wiring layer 500. The material of the guard electrode 600 may be one or more of nickel, gold, platinum, etc., and may also be chromium, tin, or palladium. The thickness of the guard electrode 600 is 1 to 6 μm, and for example, the thickness of the guard electrode 600 may be 2 μm, 3 μm, 4 μm, 5 μm, or the like.

Example 2

The present embodiment also provides a display device including a display substrate 001 and at least one light emitting device 002 formed on the display substrate 001, referring to fig. 12. The light emitting device 002 may fix the wiring layer 500 to the display substrate 001 by means of solder paste or the like and form an electrical connection. When the protective electrode 600 is provided on the wiring layer 500 of the light emitting device 002, the protective electrode 600 may be fixed to the display substrate 001 by means of solder paste or the like to be electrically connected. The light-emitting device 002 is the light-emitting device in embodiment 1. The light-emitting device has the same technical effects as the above.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. A light emitting device, comprising:

the light emitting elements are arranged above the first surface of the transparent layer at intervals, the light emitting surface of each light emitting element is opposite to the first surface of the transparent layer, and a second graph structure is arranged on the light emitting surface of each light emitting element;

2. The light-emitting device according to claim 1, wherein the first protruding portions are arranged in an array on the first surface of the transparent layer in a planar hexagonal close-packed manner, and the second protruding portions are arranged in an array on the light-emitting surface of the light-emitting element in a planar hexagonal close-packed manner.

3. The light-emitting device according to claim 1, wherein a cross-sectional area of the first convex portion in a direction parallel to the transparent layer gradually decreases from an end of the first convex portion away from the light-emitting element to an end closer to the light-emitting element.

4. A light emitting device according to claim 3 wherein the first boss is conical, hemispherical or frustoconical.

5. The light-emitting device according to claim 1, wherein a width of an end face of the first protruding portion at an end away from the light-emitting element is 1 to 5 μm, and a height of the first protruding portion in a direction perpendicular to the transparent layer is 1 to 4 μm.

6. The light-emitting device according to claim 4, wherein the first convex portion is a circular truncated cone, an end surface radius of an end of the first convex portion which is away from the light-emitting element is 1 to 3 μm, a cross-sectional radius of an end of the first convex portion which is close to the light-emitting element is 0.3 to 1.5 μm, and a height of the first convex portion in a direction perpendicular to the transparent layer is 1 to 3 μm; or the radius of the end face of the first protruding part far away from the light-emitting element is 3-6 mu m, the radius of the cross section of the end of the first protruding part near the light-emitting element is 2-4 mu m, and the height of the first protruding part along the direction vertical to the transparent layer is 2-4 mu m.

7. The light-emitting device according to claim 1, wherein a cross-sectional area of the second convex portion in a direction parallel to the transparent layer gradually decreases from an end of the second convex portion away from the transparent layer to an end closer to the transparent layer.

8. The light emitting device of claim 7, wherein the second protrusion is conical, hemispherical, or frustoconical.

9. The light-emitting device according to claim 1, wherein a width of an end face of the second protruding portion at an end away from the transparent layer is 1 to 3 μm, and a height of the second protruding portion in a direction perpendicular to the transparent layer is 1 to 3 μm.

10. The light-emitting device according to claim 8, wherein the second convex portion is a truncated cone, a radius of a cross section of an end of the second convex portion which is away from the transparent layer is 1 to 3 μm, a radius of an end surface of the second convex portion which is close to the transparent layer is 0.3 to 1.5 μm, and a height of the second convex portion in a direction perpendicular to the transparent layer is 1 to 3 μm; or the radius of the cross section of one end, far away from the transparent layer, of the second protruding part is 3-6 mu m, the radius of the end face, close to one end of the transparent layer, of the second protruding part is 2-4 mu m, and the height, perpendicular to the transparent layer, of the second protruding part is 2-4 mu m.

11. The light-emitting device according to claim 1, wherein a width of an end face of the first protruding portion at an end remote from the light-emitting element is larger than a width of an end face of the second protruding portion at an end remote from the transparent layer, and wherein a height of the first protruding portion in a direction perpendicular to the transparent layer is larger than a height of the second protruding portion in a direction perpendicular to the transparent layer.

12. The light-emitting device according to claim 1, wherein a ratio of a pitch between adjacent first protruding portions to a pitch between adjacent second protruding portions is less than 1.

13. The light-emitting device according to claim 12, wherein a ratio of a pitch between adjacent first protruding portions to a pitch between adjacent second protruding portions is 0.25, wherein the first pattern structure and the second pattern structure have corresponding regions in which each of the second protruding portions corresponds to one of the first protruding portions.

14. The light-emitting device according to claim 12, wherein a ratio of a pitch between adjacent first protruding portions to a pitch between adjacent second protruding portions is 0.5, wherein the first pattern structure and the second pattern structure have corresponding regions in which the first protruding portions and the second protruding portions are arranged in a staggered manner.

15. The light-emitting device according to claim 12, wherein a ratio of a pitch between adjacent first protruding portions to a pitch between adjacent second protruding portions is 0.75, and wherein the first pattern structure and the second pattern structure have corresponding regions in which the first protruding portions and the second protruding portions are arranged in a staggered manner or are disposed in correspondence.

16. The light-emitting device according to claim 1, wherein a pitch between adjacent first protruding portions is 2 to 4 μm and a pitch between adjacent second protruding portions is 1 to 6 μm.

17. The light-emitting device according to claim 1, further comprising:

and a protective electrode disposed on the exposed wiring layer.

18. The light-emitting device according to claim 1, further comprising:

and the filling layer is arranged between the adjacent light-emitting elements so as to fill gaps between the adjacent light-emitting elements.

19. The light-emitting device according to claim 1, wherein the wiring layer comprises:

and the second layer is electrically connected with the first layer.

20. The light-emitting device according to claim 1, wherein the plurality of light-emitting elements includes a first light-emitting element, a second light-emitting element, and a third light-emitting element, the first light-emitting element is a red light-emitting element, the second light-emitting element is a green light-emitting element, and the third light-emitting element is a blue light-emitting element.

21. The light-emitting device according to claim 1, wherein an adhesive layer is provided between the transparent layer and the light-emitting element, and wherein the adhesive layer is a transparent layer.

22. A display device, comprising:

a display substrate;

at least one light emitting device provided on the surface of the display substrate, the light emitting device being electrically connected to the display substrate, the light emitting device being as claimed in any one of claims 1 to 21.