Miniature LED device and display device

Abstract

The invention provides a miniature LED device and a display device. The device comprises: a micro LED chip structure; the first partition layer is arranged on the light emitting side of the micro LED chip, and each group of first through holes included in the first partition layer comprises a first first through hole, a second first through hole and a third first through hole; the first through hole is filled with the photoluminescent material layer of the first color, the second first through hole is filled with the photoluminescent material layer of the second color, and the third first through hole is filled with the first light absorption layer of the second color; the second partition layer is arranged on the first partition layer, and each group of second through holes included in the second partition layer comprises a first second through hole aligned with the first first through hole, a second second through hole aligned with the second first through hole and a third second through hole aligned with the third first through hole; and the first filter layer is filled in the third second through hole.

Description

Technical Field

[0001] The present disclosure relates to the technical field of semiconductor Micro LEDs, and in particular, to a Micro LED device and a display apparatus. Background Art

[0002] Micro-LED is a comprehensive technology that integrates new display technology and light-emitting diode (LED) technology. It has the advantages of small size, high brightness, high resolution, and low power consumption. It is considered to be one of the most promising next-generation new display and light-emitting devices. Currently, Micro LED full-color display can be achieved in a variety of ways, one of which is the color conversion method. However, the full-color Micro LED device achieved by the color conversion method still has problems such as unsatisfactory display effects. Summary of the invention

[0003] The solution of the present disclosure provides a micro LED device and a display apparatus.

[0004] According to one aspect of an embodiment of the present disclosure, a micro LED device is provided, wherein the micro LED device comprises: a micro LED chip structure, wherein the micro LED chip structure comprises a micro LED chip, wherein the micro LED chip comprises a micro LED unit array composed of a plurality of micro LED units; a first barrier layer, wherein the first barrier layer is arranged on a light emitting side of the micro LED chip, wherein the first barrier layer comprises a first through hole array, wherein an arrangement of the first through hole array corresponds to an arrangement of the micro LED unit array, wherein the first through hole array comprises a plurality of groups of first through holes, wherein each group of first through holes comprises three first through holes, wherein the three first through holes comprise a first first through hole, a second first through hole and a third first through hole; a photoluminescent material layer of a first color, a photoluminescent material layer of a second color and a first light absorbing layer, wherein the photoluminescent material layer of the first color fills the first through hole in each group of first through holes. first through holes in each group of first through holes, the photoluminescent material layer of the second color is filled in the second first through hole in each group of first through holes, the first light absorbing layer is filled in the third first through hole in each group of first through holes, and the first light absorbing layer is used to partially absorb the light of the third color emitted by the micro LED unit; a second barrier layer, the second barrier layer is arranged on the first barrier layer and includes a second through hole array, the second through hole array is aligned with the first through hole array, wherein the second through hole array includes a plurality of groups of second through holes corresponding to the plurality of groups of first through holes, each group of second through holes includes a first second through hole aligned with the first first through hole, a second second through hole aligned with the second first through hole, and a third second through hole aligned with the third first through hole; a first filter layer, the first filter layer is filled in the third second through hole in each group of second through holes, wherein the first filter layer only allows light of the third color to pass through.

[0005] Furthermore, the micro LED device also includes at least one of a first filling part and a second filling part, wherein: the first filling part is used to fill the first second through hole in each group of second through holes, and the first filling part includes a second filter layer that only allows light of the first color to pass through, and a second light absorbing layer or a transparent material for partially absorbing light of a third color; the second filling part is used to fill the second second through hole in each group of second through holes, and the second filling part includes a third filter layer that only allows light of the second color to pass through, and a second light absorbing layer or a transparent material for partially absorbing light of the third color.

[0006] Further, the first light absorbing layer is filled in a part of the third first through hole in each group of first through holes, and the first light filtering layer is filled in the third second through hole in each group of second through holes and in the remaining part of the third first through hole in each group of first through holes.

[0007] Further, the first filter layer is filled in a part of the third second through hole in each group of second through holes, and the first light absorption layer is filled in the third first through hole in each group of first through holes and in the remaining part of the third second through hole in each group of second through holes.

[0008] Furthermore, the micro LED device also includes: a first reflective layer, which is arranged on the second barrier layer and includes a third through hole array, the third through hole array includes multiple groups of third through holes corresponding to the multiple groups of first through holes and the multiple groups of second through holes, each group of third through holes includes a third through hole, and the third through hole is aligned with the third first through hole and the third second through hole, wherein the first reflective layer is used to reflect the third color of light emitted by the micro LED unit; a third filling part, the third filling part is filled in the third through hole, and the third filling part includes a fourth filter layer that only allows light of the third color to pass through, a third light absorption layer or a transparent material for partially absorbing light of the third color.

[0009] Furthermore, the micro LED device further includes a fourth light absorption layer, which is disposed between the first barrier layer and the second barrier layer, wherein the fourth light absorption layer is used to partially absorb light of a third color emitted by the micro LED unit.

[0010] Furthermore, the micro LED device also includes: a second reflective layer, which is arranged between the first barrier layer and the second barrier layer and includes a fourth through hole array, the fourth through hole array includes multiple groups of fourth through holes corresponding to the multiple groups of first through holes and the multiple groups of second through holes, each group of fourth through holes includes a fourth through hole, and the fourth through hole is aligned with the third first through hole and the third second through hole, wherein the second reflective layer is used to reflect the third color of light emitted by the micro LED unit; a fourth filling part, the fourth filling part is filled in the fourth through hole, and the fourth filling part includes a fifth filter layer that only allows light of the third color to pass through, a fifth light absorption layer or a transparent material for partially absorbing light of the third color.

[0011] Furthermore, the micro LED device further includes a sixth light absorption layer, which is disposed between the first barrier layer and the second reflective layer, wherein the sixth light absorption layer is used to partially absorb light of a third color emitted by the micro LED unit.

[0012] Furthermore, the micro LED device further includes an insulating layer, and the insulating layer is arranged between the first barrier layer and the micro LED chip.

[0013] Furthermore, the micro LED device also includes a third reflective layer, which is arranged between the first barrier layer and the micro LED chip, wherein the third reflective layer is used to reflect light of the first color and light of the second color.

[0014] Furthermore, each micro LED unit in the micro LED unit array includes a first semiconductor layer on the light emitting side, and the insulating layer is arranged between the first barrier layer and the first semiconductor layer.

[0015] Furthermore, the micro LED device also includes a transparent cover plate, and the transparent cover plate is arranged on the second barrier layer.

[0016] Further, the light corresponding to the first color, the light corresponding to the second color and the light of the third color are synthesized to obtain white light, the first color is red, the second color is green and the third color is blue.

[0017] Furthermore, the micro LED chip structure also includes a driver chip, and the side of the micro LED chip opposite to the light emitting side is arranged on the driver chip, or the micro LED chip structure also includes a driver chip and a flexible circuit board, and the side of the micro LED chip opposite to the light emitting side is arranged on the driver chip to form a micro LED module, and the micro LED module is arranged on the flexible circuit board through the driver chip.

[0018] Further, the material of the first barrier layer and the material of the second barrier layer include visible light shielding materials, the material of the first color photoluminescent material layer and the material of the second color photoluminescent material layer include at least one of II-VI group quantum dots, III-V group quantum dots, perovskite quantum dots and carbon quantum dots, the material of the first light absorption layer includes organic dyes, nano absorption particles or inorganic oxides for absorbing light of a third color, and the material of the first filter layer includes organic dyes, nano absorption particles or inorganic oxides that only allow light of the third color to pass through.

[0019] According to another aspect of the embodiments of the present disclosure, a display device is provided, comprising the micro LED device.

[0020] By applying the technical solution of the present disclosure, a first barrier layer is arranged on the light-emitting side of a micro LED chip and includes a first through-hole array, the arrangement of the first through-hole array corresponds to the arrangement of the micro LED unit array, each group of first through-holes in the multiple groups of first through-holes included in the first through-hole array includes a first first through-hole, a second first through-hole and a third first through-hole, a first color photoluminescent material layer is filled in the first first through-hole, a second color photoluminescent material layer is filled in the second first through-hole, and a first light absorbing layer is filled in the third first through-hole, a second barrier layer is arranged on the first barrier layer and includes a second through-hole array, the second through-hole array is aligned with the first through-hole array, each group of second through-holes in the multiple groups of second through-holes included in the second through-hole array includes a first second through-hole aligned with the first first through-hole, a second second through-hole aligned with the second first through-hole and a third second through-hole aligned with the third first through-hole, and a first filter layer is filled in the third second through-hole, thereby forming a micro LED device. In the micro LED device, the light of the third color emitted by the micro LED unit of the micro LED chip excites the material in the photoluminescent material layer of the first color to emit the light of the first color, and the light of the third color emitted by the micro LED unit of the micro LED chip excites the material in the photoluminescent material layer of the second color to emit the light of the second color. Due to the presence of the aligned third first through hole and the third second through hole, the first light absorption layer filled in the third first through hole aligned with the third second through hole can partially absorb the light of the third color emitted by the micro LED unit, and the first filter layer filled in the third second through hole aligned with the third first through hole can only allow the light of the third color emitted by the micro LED unit to pass through, that is, reflect light other than the light of the third color emitted by the micro LED unit. Therefore, by setting the first filter layer in the third first through hole The light absorbing layer can reduce the light overflow caused by the light of the third color emitted by the micro LED unit directly emitted from the micro LED device, thereby reducing the color deviation and poor color purity caused by the light overflow, thereby improving the balance of light of different colors emitted from the micro LED device and improving the color purity of the micro LED. By setting a first filter layer in the third second through hole, light other than the third color emitted by the micro LED unit can be prevented from passing through. In this way, after the light of the third color emitted by the micro LED unit is reduced by the first light absorbing layer as described above, other light different from the third color emitted by the micro LED unit can be prevented from being mixed and output from the micro LED device together with the light of the third color emitted by the micro LED unit passing through the first light absorbing layer, thereby improving the color purity of the micro LED and thereby improving the display effect of the micro LED device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0022] Figures 1 to 5 Schematic diagrams respectively show the structures of a micro LED device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present disclosure will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0025] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0026] Now, exemplary embodiments according to the present disclosure will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for clarity, the thickness of the layers and regions is enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0027] The present disclosure provides some embodiments of micro LED devices. Figures 1 to 5 , Figures 1 to 5 Schematic diagrams respectively show the structures of a micro LED device according to an embodiment of the present disclosure.

[0028] Reference Figure 1 , Figure 1 FIG. 1 is a schematic diagram showing the structure of a micro LED device 1 according to an embodiment of the present disclosure. Figure 1 As shown, the micro LED device 1 includes: a micro LED chip structure, the micro LED chip structure includes a micro LED chip 11, the micro LED chip 11 includes a micro LED unit array 111 composed of a plurality of micro LED units 1111; a first barrier layer 101, the first barrier layer 101 is arranged on the light emitting side of the micro LED chip 11, the first barrier layer 101 includes a first through hole array, the arrangement of the first through hole array corresponds to the arrangement of the micro LED unit array 111, wherein the The first through hole array includes a plurality of groups of first through holes, each group of first through holes includes three first through holes, the three first through holes include a first first through hole 10111, a second first through hole 10112 and a third first through hole 10113; a first color photoluminescent material layer 1011, a second color photoluminescent material layer 1012 and a first light absorbing layer 1013, the first color photoluminescent material layer 1011 is filled in the first first through hole 10111 in each group of first through holes, the second color photoluminescent material layer 1012 is filled in the first light absorbing layer 1013 The first light absorbing layer 1013 is filled in the third first through hole 10113 in each group of first through holes, and the first light absorbing layer 1013 is used to partially absorb the third color light emitted by the micro LED unit; the second barrier layer 102 is arranged on the first barrier layer 101 and includes a second through hole array, and the second through hole array is aligned with the first through hole array, wherein the second through hole array includes the plurality of groups of A plurality of groups of second through holes corresponding to the first through holes, each group of second through holes comprising a first second through hole 10211 aligned with the first first through hole 10111, a second second through hole 10212 aligned with the second first through hole 10112 and a third second through hole 10213 aligned with the third first through hole 10113; a first filter layer 1023, the first filter layer 1023 being filled in the third second through hole 10213 in each group of second through holes, wherein the first filter layer 1023 only allows light of a third color to pass through.

[0029] It is worth noting that, for the sake of clarity, the marking lines with arrows are used to point to the positions of the first through hole and the second through hole so as to distinguish them from the fillings in the first through hole and the second through hole. And for the sake of clarity and simplicity, Figure 1Only a group of first through holes included in the first through hole array and a group of second through holes included in the second through hole array are shown, the group of first through holes includes a first first through hole 10111, a second first through hole 10112 and a third first through hole 10113, the group of second through holes includes a first second through hole 10211, a second second through hole 10212 and a third second through hole 10213, Figure 1 The number of groups of first through holes and second through holes and the number of first through holes in each group of first through holes and the number of second through holes in each group of second through holes shown in the figure are only schematic and are not limited here, as long as the corresponding relationship between the first through holes and the second through holes mentioned above is met.

[0030] According to the technical solution of this embodiment, the first barrier layer 101 is arranged on the light-emitting side of the micro LED chip 11 and includes a first through hole array. The arrangement of the first through hole array corresponds to the arrangement of the micro LED unit array 111. Each group of first through holes in the multiple groups of first through holes included in the first through hole array includes a first first through hole 10111, a second first through hole 10112 and a third first through hole 10113. The first color photoluminescent material layer 1011 is filled in the first first through hole 10111, the second color photoluminescent material layer 1012 is filled in the second first through hole 10112, and the first light absorbing layer 1011 is filled in the second first through hole 10113. 13 is filled in the third first through hole 10113, the second barrier layer 102 is arranged on the first barrier layer 101 and includes a second through hole array, the second through hole array is aligned with the first through hole array, each group of second through holes in the multiple groups of second through holes included in the second through hole array includes a first second through hole 10211 aligned with the first first through hole 10111, a second second through hole 10212 aligned with the second first through hole 10112 and a third second through hole 10213 aligned with the third first through hole 10113, and the first filter layer 1023 is filled in the third second through hole 10213, thereby forming a micro LED device 1.In the micro LED device 1, the light of the third color emitted by the micro LED unit 1111 of the micro LED chip 11 excites the material in the photoluminescent material layer 1011 of the first color to emit the light of the first color, and the light of the third color emitted by the micro LED unit 1111 of the micro LED chip 11 excites the material in the photoluminescent material layer 1012 of the second color to emit the light of the second color. Due to the presence of the aligned third first through hole 10113 and the third second through hole 10213, the first light absorption layer 1013 filled in the third first through hole 10113 aligned with the third second through hole 10213 can partially absorb the light of the third color emitted by the micro LED unit 1111, and the first filter layer 1023 filled in the third second through hole 10213 aligned with the third first through hole 10113 can only allow the light of the third color emitted by the micro LED unit 1111 to pass through, that is, reflect the light of the third color emitted by the micro LED unit to Therefore, by setting the first light absorption layer 1013 in the third first through hole 10113, the light overflow caused by the third color light emitted by the micro LED unit 1111 directly emitted from the micro LED device can be reduced, thereby reducing the color deviation and poor color purity caused by the light overflow, thereby improving the balance of light of different colors emitted from the micro LED device and improving the color purity of the micro LED, and by setting the first filter layer 1023 in the third second through hole 10213, it is possible to prevent light other than the third color light emitted by the micro LED unit 1111 from passing through. In this way, after the third color light emitted by the micro LED unit is reduced by the first light absorption layer as described above, it is possible to avoid other light different from the third color light emitted by the micro LED unit from being mixed and output from the micro LED device together with the third color light emitted by the micro LED unit passing through the first light absorption layer, thereby improving the color purity of the micro LED and thereby improving the display effect of the micro LED device. Therefore, it should be understood that the function of the first filter layer 1023 is to reflect light except for light of the corresponding color, which is different from the function of the first light absorption layer 1013 to absorb light.

[0031] According to an embodiment of the present disclosure, the first barrier layer 101 can play the role of a grid, and the inside of the grid can be filled with corresponding materials. The material of the first barrier layer 101 and the material of the second barrier layer 102 can include a visible light shielding material, which can include, for example, a matting material such as a black photoresist, a reflective material such as a metal layer. The material of the first color photoluminescent material layer 1011 and the material of the second color photoluminescent material layer 1012 include at least one of II-VI group quantum dots, III-V group quantum dots, perovskite quantum dots and carbon quantum dots. The material of the first light absorption layer 1013 includes an organic dye, nano absorption particles or inorganic oxide for partially absorbing light of a third color, such as zinc oxide nanoparticle photoresist. The material of the first filter layer 1023 includes an organic dye, nano absorption particles or inorganic oxide that only allows light of the third color to pass.

[0032] According to an embodiment of the present disclosure, the micro LED device 1 also includes at least one of a first filling part and a second filling part, wherein: the first filling part is used to fill the first second through hole in each group of second through holes, and the first filling part includes a second filter layer that only allows light of the first color to pass through, a second light absorbing layer or a transparent material for partially absorbing light of a third color; the second filling part is used to fill the second second through hole in each group of second through holes, and the second filling part includes a third filter layer that only allows light of the second color to pass through, a second light absorbing layer or a transparent material for partially absorbing light of the third color.

[0033] According to an embodiment of the present disclosure, the material of the second light filter layer and the material of the third light filter layer include organic dyes, nano absorption particles or inorganic oxides. The transparent material can be any applicable material such as transparent resin. The material of the second light absorption layer includes organic dyes, nano absorption particles or inorganic oxides for partially absorbing light of a third color. The material of the second light absorption layer can be the same as the material of the first light absorption layer, such as zinc oxide nanoparticle photoresist.

[0034] like Figure 1 As shown, the first filling portion is filled in the first second through hole 10211 in each group of second through holes, and the first filling portion includes a second filter layer 1021 that only allows light of the first color to pass through; the second filling portion is filled in the second second through hole 10212 in each group of second through holes, and the second filling portion includes a third filter layer 1022 that only allows light of the second color to pass through.

[0035] According to the technical solution of this embodiment, when the second light absorption layer is filled in the first second through hole 10211 and / or in the second second through hole 10212, and when a part of the third color light emitted by the micro LED unit corresponding to the first color photoluminescent material layer 1011 and the second color photoluminescent material layer 1012 does not participate in the excitation of the photoluminescent material layer and leaks out through the photoluminescent material layer, the second light absorption layer filled in the first second through hole 10211 and / or in the second second through hole 10212 can absorb the leaked part of the third color light, thereby reducing the mixed output of the leaked part of the third color light and the first color light and the second color light emitted by exciting the photoluminescent material layer, thereby improving the color purity of the micro LED, thereby improving the display effect of the micro LED device. In addition, when the first second through hole 10211 is filled with the second filter layer 1021 and / or the second second through hole 10212 is filled with the third filter layer 1022, the second filter layer 1021 only allows the light of the first color to pass through, and the second filter layer 1021 will reflect the light of the third color toward the direction of the photoluminescent material layer 1011 of the first color. The third filter layer 1022 only allows the light of the second color to pass through, and the third filter layer 1022 will reflect the light of the third color toward the direction of the photoluminescent material layer 1012 of the second color. Therefore, the second filter layer 1021 and the third filter layer 1022 function to reflect light other than the light of the corresponding color, which is different from the function of the second light absorption layer to absorb light.

[0036] According to an embodiment of the present disclosure, the first light absorbing layer is filled in a portion of the third first through hole in each group of first through holes, and the first light filtering layer is filled in the third second through hole in each group of second through holes and in the remaining portion of the third first through hole in each group of first through holes.

[0037] According to the technical solution of this embodiment, the thickness of the first filter layer can be increased by filling the first filter layer in the third second through hole in each group of second through holes and a part of the third first through hole in each group of first through holes, thereby further preventing light other than the third color light emitted by the micro LED unit 1111 from passing through. In this way, after the third color light emitted by the micro LED unit is reduced by the first light absorption layer as described above, other light different from the third color light emitted by the micro LED unit can be prevented from being mixed and output from the micro LED device together with the third color light emitted by the micro LED unit passing through the first light absorption layer, thereby improving the color purity of the micro LED, thereby improving the display effect of the micro LED device.

[0038] According to an embodiment of the present disclosure, the first filter layer is filled in a portion of the third second through hole in each group of second through holes, and the first light absorption layer is filled in the third first through hole in each group of first through holes and in the remaining portion of the third second through hole in each group of second through holes.

[0039] According to the technical solution of this embodiment, by filling the first light absorption layer in the third first through hole in each group of first through holes and a part of the third second through hole in each group of second through holes, the thickness of the first light absorption layer can be increased, so that the light of the third color emitted by the micro LED unit 1111 can be further absorbed, thereby further reducing the light overflow caused by the third color light emitted by the micro LED unit 1111 directly from the micro LED device, thereby reducing the color deviation and poor color purity caused by the light overflow, thereby improving the balance of different colors of light emitted from the micro LED device and enhancing the color purity of the micro LED.

[0040] According to the embodiments of the present disclosure, Figure 1 As shown, the micro LED device 1 also includes an insulating layer 104, and the insulating layer 104 is arranged between the first barrier layer 101 and the micro LED chip 11. In addition, the micro LED chip can be any micro LED chip suitable for preparing a micro LED device. For example, the structure of the micro LED chip can include a face-up structure, a flip-chip structure or a vertical structure, etc., which is not limited here. Each micro LED unit in the micro LED unit array can include an exposed first semiconductor layer on its light-emitting side. Depending on the type of micro LED device, in some embodiments, the first semiconductor layer may include an N-GaN layer; in other embodiments, the first semiconductor layer may include a P-GaN layer. As Figure 1 As shown, each micro LED unit 1111 in the micro LED unit array 111 may include a first semiconductor layer 11111 on the light emitting side, so the insulating layer 104 may be disposed between the first barrier layer 101 and the first semiconductor layer 11111. Therefore, the insulating layer 104 may isolate, for example, the first semiconductor layer 11111 of the micro LED chip 11 from the first color photoluminescent material layer 1011, the second color photoluminescent material layer 1012 and the first light absorbing layer 1013 in the first through hole, thereby protecting the first color photoluminescent material layer 1011, the second color photoluminescent material layer 1012 and the first light absorbing layer 1013. The material of the insulating layer 104 may include any applicable polymer organic material and inorganic oxide such as silicon dioxide.

[0041] According to the embodiments of the present disclosure, Figure 1As shown, the micro LED device 1 further includes a third reflective layer 103, which is disposed between the first barrier layer 101 and the micro LED chip 11, wherein the third reflective layer 103 is used to reflect the light of the first color and the light of the second color. Specifically, the third reflective layer 103 included in the micro LED device 1 can be disposed between the first barrier layer 101 and the insulating layer 104. The material of the third reflective layer 103 includes a distributed Bragg reflector film for reflecting the light of the first color and the light of the second color, and the third reflective layer 103 can be, for example, a distributed Bragg reflector film formed by alternately stacking silicon dioxide layers and titanium dioxide layers.

[0042] According to the technical solution of this embodiment, the third reflective layer 103 is located between the first barrier layer 101 and the micro LED chip 11 and covers the first color photoluminescent material layer 1011 and the second color photoluminescent material layer 1012. Since the third reflective layer 103 is used to reflect the first color light corresponding to the first color photoluminescent material layer 1011 and the second color light corresponding to the second color photoluminescent material layer 1012, the third color light emitted from the micro LED unit 1111 can pass through the third reflective layer 103, and when the third color light emitted by the micro LED unit 1111 excites the first color photoluminescent material layer 1011 to emit the first color light, part of the excited first color light will be emitted in the direction of the micro LED unit 1111, and the third reflective layer 103 can reflect the part of the first color light in the direction of the first color photoluminescent material layer 1011, so as to increase the light output of the color light corresponding to the photoluminescent material layer, thereby improving the micro LED chip 1111. The brightness of the micro LED can be improved, and part of the first color light emitted toward the direction of the micro LED unit can be prevented from interfering with the third color light emitted by the micro LED unit; similarly, when the third color light emitted by the micro LED unit excites the second color photoluminescent material layer 1012 to emit the second color light, part of the excited second color light will be emitted toward the direction of the micro LED unit 1111, and the third reflective layer 103 can reflect the part of the second color light toward the direction of the second color photoluminescent material layer 1012, thereby increasing the light output of the color light corresponding to the photoluminescent material layer, thereby improving the brightness of the micro LED, and preventing part of the second color light emitted toward the direction of the micro LED unit from interfering with the third color light emitted by the micro LED unit.

[0043] According to an embodiment of the present disclosure, the micro LED device 1 may further include a transparent cover plate, which is disposed on the second barrier layer 102. The transparent cover plate protects the structure covered by it. The transparent cover plate may include any applicable cover plate such as a glass cover plate, a polyimide cover plate or a sapphire cover plate.

[0044] According to an embodiment of the present disclosure, the light of the first color refers to the light of the wavelength range corresponding to the first color, the light of the second color refers to the light of the wavelength range corresponding to the second color, and the light of the third color refers to the light of the wavelength range corresponding to the third color. The light corresponding to the first color, the light corresponding to the second color, and the light of the third color can be synthesized to obtain white light, and the first color, the second color, and the third color can be three primary colors, for example, the first color is red, the second color is green, and the third color is blue.

[0045] According to an embodiment of the present disclosure, the micro LED chip structure also includes a driving chip, and the side of the micro LED chip 11 opposite to the light emitting side is arranged on the driving chip, or the micro LED chip structure also includes a driving chip and a flexible circuit board, and the side of the micro LED chip 11 opposite to the light emitting side is arranged on the driving chip to form a micro LED module, and the micro LED module is arranged on the flexible circuit board through the driving chip.

[0046] Reference Figure 2 , Figure 2 FIG. 4 is a schematic structural diagram showing a micro LED device 2 according to another embodiment of the present disclosure. Figure 2 The micro LED device 2 shown is Figure 1 The difference between the micro LED device 1 shown is that the micro LED device 2 also includes: a first reflective layer 201, the first reflective layer 201 is arranged on the second barrier layer 102 and includes a third through hole array, the third through hole array includes multiple groups of third through holes corresponding to the multiple groups of first through holes and the multiple groups of second through holes, each group of third through holes includes a third through hole 20111, the third through hole 20111 is aligned with the third first through hole 10113 and the third second through hole 10213, wherein the first reflective layer 201 is used to reflect the third color of light emitted by the micro LED unit 1111; a third filling part, the third filling part is filled in the third through hole 20111, and the third filling part includes a fourth filter layer 2011 that only allows light of the third color to pass through, a third light absorption layer or a transparent material for partially absorbing light of the third color.

[0047] According to an embodiment of the present disclosure, the material of the first reflective layer 201 includes a distributed Bragg reflective film for reflecting light of a third color, and the first reflective layer 401 may be, for example, a distributed Bragg reflective film formed by alternately stacking silicon dioxide layers and titanium dioxide layers. It is worth noting that although the first reflective layer 201 and the third reflective layer 103 are both distributed Bragg reflective films formed by alternately stacking silicon dioxide layers and titanium dioxide layers, the number of silicon dioxide layers and titanium dioxide layers in the first reflective layer 201 and the thickness of each silicon dioxide layer and each titanium dioxide layer are different from those of the third reflective layer 103. The material of the fourth filter layer 2011 includes an organic dye, nano-absorption particles or inorganic oxides, and the material of the fourth filter layer 2011 may be the same as that of the first filter layer 1023. The material of the third light absorption layer includes an organic dye, nano-absorption particles or inorganic oxides for partially absorbing light of a third color, and the material of the third light absorption layer may be the same as that of the first light absorption layer 1013 and the second light absorption layer, and may be, for example, zinc oxide nanoparticle photoresist. The transparent material may be any suitable material such as transparent resin.

[0048] According to the technical solution of this embodiment, on the one hand, since the first reflective layer 201 covers the photoluminescent material layer 1011 of the first color and the photoluminescent material layer 1012 of the second color, when a part of the light of the third color emitted by the micro LED unit 1111 does not participate in exciting the photoluminescent material layer and passes through the photoluminescent material layer and leaks out, the first reflective layer 201 can reflect the part of the light of the third color leaking from the photoluminescent material layer 1011 of the first color back to the photoluminescent material layer 1011 of the first color to re-participate in exciting the photoluminescent material layer, and the first reflective layer 201 can reflect the part of the light of the third color leaking from the photoluminescent material layer 1011 of the first color back to the photoluminescent material layer 1011 of the first color, and re-participate in exciting the photoluminescent material layer, and A reflective layer 201 can reflect part of the third color light leaking from the second color photoluminescent material layer 1012 back to the second color photoluminescent material layer 1012 and re-participate in exciting the photoluminescent material layer, thereby increasing the light participating in exciting the photoluminescent material layer, thereby increasing the light output of the color corresponding to the photoluminescent material layer, thereby improving the brightness of the micro-LED, and can reduce the mixed output of the leaked part of the light and the different color lights emitted by exciting the photoluminescent material layer, thereby improving the color purity of the micro-LED, thereby improving the display effect of the micro-LED device.

[0049] On the other hand, when the third through hole 20111 aligned with the third first through hole 10113 and the third second through hole 10213 is filled with the fourth filter layer 2011, light other than the light emitted by the micro LED unit can be further prevented from passing through. Thus, after the light emitted by the micro LED unit is reduced by the first light absorption layer as described above, other light other than the light emitted by the micro LED unit can be prevented from being mixed and outputted from the micro LED device together with the light emitted by the micro LED unit passing through the first light absorption layer, thereby improving the color purity of the micro LED, thereby improving the display effect of the micro LED device. When the third through hole 20111 aligned with the third first through hole 10113 and the third second through hole 10213 is filled with the third light absorption layer, the third light absorption layer can partially absorb the third color light, such as blue light, emitted by the micro LED unit 1111 corresponding to the first light absorption layer 1013, thereby further reducing the blue light overflow caused by the blue light emitted by the micro LED unit directly emitted from the micro LED device, thereby further improving the display effect of the micro LED device.

[0050] In such Figure 1 In the case where the micro LED device 1 shown includes a transparent cover plate, according to an embodiment of the present disclosure, the transparent cover plate can be disposed on the first reflective layer 201 .

[0051] Reference Figure 3 , Figure 3 is a schematic structural diagram showing a micro LED device 3 according to another embodiment of the present disclosure. Figure 3 The micro LED device 3 shown is Figure 2 The difference between the micro LED device 2 shown is that the micro LED device 3 also includes a fourth light absorption layer 301, and the fourth light absorption layer 301 is arranged between the first barrier layer 101 and the second barrier layer 102, wherein the fourth light absorption layer 301 is used to partially absorb the third color light emitted by the micro LED unit.

[0052] According to an embodiment of the present disclosure, the material of the fourth light absorption layer 301 includes an organic dye, nano-absorption particles or an inorganic oxide for absorbing a third color of light such as blue light, and the material of the fourth light absorption layer 401 can be the same as the material of the first light absorption layer 1013, the material of the second light absorption layer and the material of the third light absorption layer, for example, it can be zinc oxide nanoparticle photoresist.

[0053] According to the technical solution of this embodiment, the fourth light absorption layer 301 covers the first light absorption layer 1013, so the fourth light absorption layer 301 can partially absorb the third color light emitted by the micro LED unit 1111 corresponding to the first light absorption layer 1013, thereby further reducing the light overflow caused by the third color light emitted by the micro LED unit directly emitted from the micro LED device, thereby further improving the display effect of the micro LED device. And because the fourth light absorption layer 301 covers the first color photoluminescent material layer 1011 and the second color photoluminescent material layer 1012, when a part of the third color light emitted by the micro LED unit corresponding to the two photoluminescent material layers does not participate in the excitation of the photoluminescent material layer and passes through the photoluminescent material layer and leaks out, the fourth light absorption layer 301 can absorb the leaked part of the third color light, thereby reducing the mixing output of the leaked part of the third color light with the first color light and the second color light emitted by the exciting photoluminescent material layer, thereby improving the color purity of the micro LED, thereby improving the display effect of the micro LED device.

[0054] Reference Figure 4 , Figure 4 is a schematic structural diagram showing a micro LED device 4 according to another embodiment of the present disclosure. Figure 4 The micro LED device 4 shown is Figure 1 The difference between the micro LED device 1 shown is that the micro LED device 4 also includes: a second reflective layer 401, the second reflective layer 401 is arranged between the first barrier layer 101 and the second barrier layer 102 and includes a fourth through hole array, the fourth through hole array includes multiple groups of fourth through holes corresponding to the multiple groups of first through holes and the multiple groups of second through holes, each group of fourth through holes includes a fourth through hole 40111, the fourth through hole 40111 is aligned with the third first through hole 10113 and the third second through hole 10213, wherein the second reflective layer 401 is used to reflect the third color of light emitted by the micro LED unit 1111; a fourth filling part, the fourth filling part is filled in the fourth through hole 40111, and the fourth filling part includes a fifth filter layer 4011 that only allows light of the third color to pass through, a fifth light absorption layer or a transparent material for partially absorbing light of the third color.

[0055] According to an embodiment of the present disclosure, the material of the second reflective layer 401 includes a distributed Bragg reflector for reflecting light of a third color, and the material of the second reflective layer 401 may be the same as the material of the first reflective layer 201, and the second reflective layer 401 may be, for example, a distributed Bragg reflector formed by alternately stacking silicon dioxide layers and titanium dioxide layers. The material of the fifth filter layer 4011 includes an organic dye, nano-absorption particles or an inorganic oxide, and the material of the fifth filter layer 4011 may be the same as the material of the first filter layer 1023 and the material of the fourth filter layer 2011. The material of the fifth light absorption layer includes an organic dye, nano-absorption particles or an inorganic oxide for partially absorbing light of a third color, and the material of the fifth light absorption layer may be the same as the material of the first light absorption layer 1013, the material of the second light absorption layer, the material of the third light absorption layer and the material of the fourth light absorption layer, and may be, for example, zinc oxide nanoparticle photoresist. The transparent material may be, for example, any applicable material such as a transparent resin.

[0056] According to the technical solution of this embodiment, on the one hand, since the second reflective layer 401 covers the photoluminescent material layer 1011 of the first color and the photoluminescent material layer 1012 of the second color, when a part of the light of the third color emitted by the micro LED unit 1111 does not participate in exciting the photoluminescent material layer and passes through the photoluminescent material layer and leaks out, the second reflective layer 401 can reflect the part of the light of the third color leaking from the photoluminescent material layer 1011 of the first color back to the photoluminescent material layer 1011 of the first color to re-participate in exciting the photoluminescent material layer, and the third color of the light emitted by the micro LED unit 1111 is not part of the photoluminescent material layer and passes through the photoluminescent material layer and leaks out. The second reflective layer 401 can reflect part of the third color light leaking from the second color photoluminescent material layer 1012 back to the second color photoluminescent material layer 1012 and re-participate in exciting the photoluminescent material layer, thereby increasing the light participating in exciting the photoluminescent material layer, thereby increasing the light output of the color corresponding to the photoluminescent material layer, thereby improving the brightness of the micro-LED, and can reduce the mixed output of the leaked part of the light and the different color lights emitted by exciting the photoluminescent material layer, thereby improving the color purity of the micro-LED, thereby improving the display effect of the micro-LED device.

[0057] On the other hand, when the fifth filter layer 4011 is filled in the fourth through hole 40111 aligned with the third first through hole 10113 and the third second through hole 10213, light other than the light emitted by the micro LED unit can be further prevented from passing through. In this way, after the light emitted by the micro LED unit is reduced by the first light absorption layer as described above, other light other than the light emitted by the micro LED unit can be prevented from being mixed and output from the micro LED device together with the light emitted by the micro LED unit passing through the first light absorption layer, thereby improving the color purity of the micro LED, thereby improving the display effect of the micro LED device. When the fifth light absorption layer is filled in the fourth through hole 40111 aligned with the third first through hole 10113 and the third second through hole 10213, the fifth light absorption layer can partially absorb the third color light, such as blue light, emitted by the micro LED unit 1111 corresponding to the first light absorption layer 1013, thereby further reducing the blue light overflow caused by the blue light emitted by the micro LED unit directly emitted from the micro LED device, thereby further improving the display effect of the micro LED device.

[0058] Reference Figure 5 , Figure 5 is a schematic structural diagram showing a micro LED device 5 according to another embodiment of the present disclosure. Figure 5 The micro LED device 5 shown is Figure 4 The difference of the micro LED device 4 shown is that the micro LED device 5 also includes a sixth light absorption layer 501, and the sixth light absorption layer 501 is arranged between the first barrier layer 101 and the second reflective layer 401, wherein the sixth light absorption layer 501 is used to partially absorb the third color light emitted by the micro LED unit.

[0059] According to an embodiment of the present disclosure, the material of the sixth light absorption layer 501 includes an organic dye, nano-absorption particles or an inorganic oxide for absorbing a third color of light such as blue light, and the material of the sixth light absorption layer 501 can be the same as the material of the first light absorption layer 1013, the material of the second light absorption layer, the material of the third light absorption layer, the material of the fourth light absorption layer 301 and the material of the fifth light absorption layer, for example, it can be zinc oxide nanoparticle photoresist.

[0060] According to the technical solution of this embodiment, the sixth light absorption layer 501 covers the first light absorption layer 1013, so the sixth light absorption layer 501 can partially absorb the third color light emitted by the micro LED unit 1111 corresponding to the first light absorption layer 1013, thereby further reducing the light overflow caused by the third color light emitted by the micro LED unit directly emitted from the micro LED device, thereby further improving the display effect of the micro LED device. And because the sixth light absorption layer 501 covers the first color photoluminescent material layer 1011 and the second color photoluminescent material layer 1012, when a part of the third color light emitted by the micro LED unit corresponding to the two photoluminescent material layers does not participate in the excitation of the photoluminescent material layer and passes through the photoluminescent material layer and leaks out, the sixth light absorption layer 501 can absorb the leaked part of the third color light, thereby reducing the mixing output of the leaked part of the third color light with the first color light and the second color light emitted by the exciting photoluminescent material layer, thereby improving the color purity of the micro LED, thereby improving the display effect of the micro LED device.

[0061] According to an embodiment of the present disclosure, the pixel size in the above-mentioned micro LED device is generally less than 50 microns.

[0062] The present disclosure also provides a display device, which includes the above-mentioned type LED device. The display device can be applied to flexible electronic devices to realize technologies such as augmented reality (AR), virtual reality (VR), extended reality (XR), and mixed reality (MR). For example, the micro LED device can be the projection part of an electronic device, such as a projector, a head-up display (HUD), etc.; for another example, the micro LED device can also be the display part of an electronic device, such as a smart phone, a smart watch, a laptop, a tablet computer, a driving recorder, a navigator, a head-mounted device, and any other device with a display screen.

[0063] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0064] It should be understood that "one embodiment" or "an embodiment" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present application, the size of the serial number of each step / process mentioned above does not mean the order of execution, and the execution order of each step / process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application. In addition, the serial numbers of the embodiments of the present application mentioned above are only for description and do not represent the advantages and disadvantages of the embodiments.

[0065] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0066] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A micro LED device, wherein: The micro LED device comprises: A micro LED chip structure, the micro LED chip structure comprising a micro LED chip, the micro LED chip comprising a micro LED unit array consisting of a plurality of micro LED units; A first barrier layer, the first barrier layer is arranged on the light-emitting side of the micro LED chip, the first barrier layer includes a first through hole array, the arrangement of the first through hole array corresponds to the arrangement of the micro LED unit array, wherein the first through hole array includes a plurality of groups first through holes, each group of first through holes includes three first through holes, and the three first through holes include a first first through hole, a second first through hole, and a third first through hole; A photoluminescent material layer of a first color, a photoluminescent material layer of a second color, and a first light absorbing layer, wherein the photoluminescent material layer of the first color is filled in a first first through hole in each group of first through holes, the photoluminescent material layer of the second color is filled in a second first through hole in each group of first through holes, and the first light absorbing layer is filled in a third first through hole in each group of first through holes, and the first light absorbing layer is used to partially absorb light of a third color emitted by the micro LED unit; A second barrier layer is disposed on the first barrier layer and includes a second through hole array, the second through hole array being aligned with the first through hole array, wherein the second through hole array comprises a plurality of groups of second through holes corresponding to the plurality of groups of first through holes, each group of second through holes comprising a first second through hole aligned with the first first through hole, a second second through hole aligned with the second first through hole, and a third second through hole aligned with the third first through hole; A first filter layer is filled in the third second through hole in each group of second through holes, wherein the first filter layer only allows light of a third color to pass through.

2. The micro LED device according to claim 1, wherein: The micro LED device further comprises at least one of a first filling portion and a second filling portion, wherein: The first filling part is used to fill the first second through hole in each group of second through holes, and the first filling part includes a second filter layer that only allows light of the first color to pass through, a second light absorption layer that partially absorbs light of the third color, or a transparent material; The second filling part is used to fill the second second through hole in each group of second through holes, and the second filling part includes a third filter layer that only allows light of the second color to pass through, a second light absorption layer for partially absorbing light of the third color, or a transparent material.

3. The micro LED device according to claim 1 or 2, wherein: The first light absorbing layer is filled in a part of the third first through hole in each group of first through holes, and the first light filtering layer is filled in the third second through hole in each group of second through holes and in the remaining part of the third first through hole in each group of first through holes.

4. The micro LED device according to claim 1 or 2, wherein: The first filter layer is filled in a portion of the third second through hole in each group of second through holes, and the first light absorption layer is filled in the third first through hole in each group of first through holes and in the remaining portion of the third second through hole in each group of second through holes.

5. The micro LED device according to any one of claims 1 to 4, wherein: The micro LED device further comprises: a first reflective layer, the first reflective layer being disposed on the second barrier layer and comprising a third through hole array, the third through hole array comprising a plurality of groups of third through holes corresponding to the plurality of groups of first through holes and the plurality of groups of second through holes, each group of third through holes comprising one third through hole, the third through hole being aligned with the third first through hole and the third second through hole, wherein the first reflective layer is used to reflect the light of a third color emitted by the micro LED unit; A third filling part is filled in the third through hole, and the third filling part includes a transparent material.

6. The micro LED device according to claim 5, wherein: The micro LED device further includes a fourth light absorbing layer, which is disposed between the first barrier layer and the second barrier layer, wherein the fourth light absorbing layer is used to partially absorb light of a third color emitted by the micro LED unit.

7. The micro LED device according to any one of claims 1 to 4, wherein: The micro LED device further comprises: a second reflective layer, the second reflective layer being disposed between the first barrier layer and the second barrier layer and comprising a fourth through hole array, the fourth through hole array comprising a plurality of groups of fourth through holes corresponding to the plurality of groups of first through holes and the plurality of groups of second through holes, each group of fourth through holes comprising one fourth through hole, the fourth through hole being aligned with the third first through hole and the third second through hole, wherein the second reflective layer is used to reflect the light of a third color emitted by the micro LED unit; A fourth filling part is filled in the fourth through hole, and the fourth filling part includes a transparent material.

8. The micro LED device according to claim 7, wherein: The micro LED device further includes a sixth light absorption layer, which is disposed between the first barrier layer and the second reflective layer, wherein the sixth light absorption layer is used to partially absorb light of a third color emitted by the micro LED unit.

9. The micro LED device according to any one of claims 1 to 8, wherein: The micro LED device further includes an insulating layer, and the insulating layer is disposed between the first barrier layer and the micro LED chip.

10. The micro LED device according to any one of claims 1 to 8, wherein: The micro LED device further includes a third reflective layer, which is disposed between the first barrier layer and the micro LED chip, wherein the third reflective layer is used to reflect light of the first color and light of the second color.

11. The micro LED device according to claim 9, wherein: Each micro LED unit in the micro LED unit array includes a first semiconductor layer on the light emitting side, and the insulating layer is arranged between the first barrier layer and the first semiconductor layer.

12. The micro LED device according to claim 1, wherein: The micro LED device further includes a transparent cover plate, and the transparent cover plate is disposed on the second barrier layer.

13. The micro LED device according to any one of claims 1 to 12, wherein: The light corresponding to the first color, the light corresponding to the second color, and the light of the third color are synthesized to obtain white light, the first color is red, the second color is green, and the third color is blue.

14. The micro LED device according to any one of claims 1 to 13, wherein: The micro LED chip structure further includes a driving chip, and a side of the micro LED chip opposite to the light emitting side is arranged on the driving chip. Alternatively, the micro LED chip structure further includes a driving chip and a flexible circuit board, the side of the micro LED chip opposite to the light emitting side is arranged on the driving chip to form a micro LED module, and the micro LED module is arranged on the flexible circuit board through the driving chip.

15. The micro LED device according to claim 1, wherein: The material of the first barrier layer and the material of the second barrier layer include visible light shielding materials, the material of the first color photoluminescent material layer and the material of the second color photoluminescent material layer include at least one of II-VI group quantum dots, III-V group quantum dots, perovskite quantum dots and carbon quantum dots, the material of the first light absorption layer includes organic dyes, nano absorption particles or inorganic oxides for absorbing light of a third color, and the material of the first filter layer includes organic dyes, nano absorption particles or inorganic oxides that only allow light of the third color to pass through.

16. A display device, wherein: The display device comprises the micro LED device according to any one of claims 1 to 15.

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