Miniature LED devices and display devices

Abstract

This disclosure provides a micro LED device and a display apparatus. The device includes: a micro LED chip structure; a first partition layer disposed on the light-emitting side of the micro LED chip, wherein each group of first through-holes in the first partition layer includes a first first through-hole, a second first through-hole, and a third first through-hole; a photoluminescent material layer of a first color filled in the first first through-hole, a photoluminescent material layer of a second color filled in the second first through-hole, and a first light-absorbing layer of a second color filled in the third first through-hole; a second partition layer disposed on the first partition layer, wherein each group of second through-holes in the second partition layer 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 filled in the third second through-hole.

Description

Technical Field

[0001] This disclosure relates to the technical field of semiconductor Micro LED, and more specifically, to a micro LED device and display device. Background Technology

[0002] Micro-LED is a comprehensive technology that integrates novel display technology with light-emitting diode (LED) technology. It boasts advantages such as small size, high brightness, high resolution, and low power consumption, and is considered one of the most promising next-generation display and light-emitting devices. Currently, full-color Micro-LED displays can be achieved in various ways, one of which is color conversion. However, full-color Micro-LED devices achieved through color conversion still suffer from unsatisfactory display effects. Summary of the Invention

[0003] The present disclosure provides a micro LED device and a display device.

[0004] According to one aspect of the present disclosure, a micro-LED device is provided, wherein the micro-LED device includes: a micro-LED chip structure, the micro-LED chip structure including a micro-LED chip, the micro-LED chip including a micro-LED unit array composed of a plurality of micro-LED units; a first partition layer disposed on the light-emitting side of the micro-LED chip, the first partition layer including a first through-hole array, the arrangement of the first through-hole array corresponding to the arrangement of the micro-LED unit array, wherein the first through-hole array includes multiple sets of first through-holes, each set of first through-holes including three first through-holes, the three first through-holes including a first first through-hole, a second first through-hole, and a third first through-hole; a first color photoluminescent material layer, a second color photoluminescent material layer, and a first light-absorbing layer, the first color photoluminescent material layer filling the first light-absorbing layer in each set of first through-holes. In each of the first through-holes, a photoluminescent material layer of the second color is filled in the second first through-hole in each group of first through-holes, and a first light-absorbing layer is filled in the third first through-hole in each group of first through-holes. The first light-absorbing layer is used to partially absorb the third color light emitted by the micro LED unit. A second barrier layer is disposed on the first barrier layer and includes a second through-hole array aligned with the first through-hole array. The second through-hole array includes multiple groups of second through-holes corresponding to the multiple 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 is filled in the third second through-hole in each group of second through-holes. The first filter layer allows only the third color light to pass through.

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

[0006] Furthermore, the first light-absorbing layer fills a portion of the third first through-hole in each group of first through-holes, and the first light-filtering layer fills the third second through-hole in each group of second through-holes and the remaining portion of the third first through-hole in each group of first through-holes.

[0007] Furthermore, the first filter layer fills a portion of the third second through-hole in each group of second through-holes, and the first light-absorbing layer fills the third first through-hole in each group of first through-holes and the remaining portion of the third second through-hole in each group of second through-holes.

[0008] Furthermore, the micro-LED device further includes: a first reflective layer disposed on the second barrier layer and including a third through-hole array, the third through-hole array including multiple sets of third through-holes corresponding to the multiple sets of first through-holes and the multiple sets of second through-holes, each set of third through-holes including 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 third color light emitted by the micro-LED unit; a third filling portion filling the third through-hole, the third filling portion including a fourth light-filtering layer that only allows the third color light to pass through, a third light-absorbing layer for partially absorbing the third color light, or a transparent material.

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

[0010] Furthermore, the micro-LED device further includes: a second reflective layer disposed between the first barrier layer and the second barrier layer and including a fourth through-hole array, the fourth through-hole array including multiple sets of fourth through-holes corresponding to the multiple sets of first through-holes and the multiple sets of second through-holes, each set of fourth through-holes including 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 third color light emitted by the micro-LED unit; a fourth filling portion filling the fourth through-hole, the fourth filling portion including a fifth light-filtering layer that only allows the third color light to pass through, a fifth light-absorbing layer for partially absorbing the third color light, or a transparent material.

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

[0012] Furthermore, the micro-LED device also includes an insulating layer disposed between the first barrier layer and the micro-LED chip.

[0013] Furthermore, the micro LED device also includes a third reflective layer 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.

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

[0015] Furthermore, the micro LED device also includes a transparent cover plate disposed on the second partition layer.

[0016] Furthermore, white light is obtained by combining light corresponding to the first color, light corresponding to the second color, and light corresponding to the third color, wherein 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, with the side of the micro LED chip opposite to the light-emitting side disposed on the driver chip. Alternatively, the micro LED chip structure also includes a driver chip and a flexible circuit board, with the side of the micro LED chip opposite to the light-emitting side disposed on the driver chip to form a micro LED module, and the micro LED module disposed on the flexible circuit board via the driver chip.

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

[0019] According to another aspect of the embodiments of this disclosure, a display device is also provided. The display device includes the aforementioned micro-LED device.

[0020] Using the technical solution of this disclosure, a first barrier layer is disposed 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 first through-hole array includes a first first through-hole, a second first through-hole, and a third first through-hole. A photoluminescent material layer of a first color is filled in the first first through-hole, a photoluminescent material layer of a second color 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 disposed 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 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. A first light-filtering layer is filled in the third second through-hole, thereby forming a micro LED device. In this micro-LED device, the third-color light emitted by the micro-LED unit of the micro-LED chip excites the material in the first-color photoluminescent material layer to emit the first-color light, and the third-color light emitted by the micro-LED unit of the micro-LED chip excites the material in the second-color photoluminescent material layer to emit the second-color light. Due to the presence of aligned third first vias and third second vias, the first light-absorbing layer filled in the third first via aligned with the third second via can partially absorb the third-color light emitted by the micro-LED unit, and the first light-filtering layer filled in the third second via aligned with the third first via can only allow the third-color light emitted by the micro-LED unit to pass through, i.e., reflect light other than the third-color light emitted by the micro-LED unit. Therefore, by setting a first filter layer in the third first via... The light-absorbing layer can reduce light overflow caused by the direct emission of the third color light emitted by the micro-LED unit from the micro-LED device. This reduces color deviation and poor color purity caused by light overflow, thereby improving the uniformity of different colors of light emitted from the micro-LED device and enhancing the color purity of the micro-LED. Furthermore, by setting the first light-filtering layer in the third second through-hole, light other than the third color light emitted by the micro-LED unit can be prevented from passing through. Thus, after the third color light emitted by the micro-LED unit is reduced by passing through the first light-absorbing layer as described above, other light different from the third color light emitted by the micro-LED unit can be prevented from mixing and being output from the micro-LED device together with the third color light emitted by the micro-LED unit that has passed through the first light-absorbing layer, thereby enhancing the color purity of the micro-LED and improving the display effect of the micro-LED device. Attached Figure Description

[0021] The above and other objects, features, and advantages of exemplary embodiments of the present disclosure will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the present disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0022] Figures 1 to 5 These are schematic diagrams showing the structure of a micro LED device according to one embodiment of the present disclosure. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

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

[0026] Exemplary embodiments according to this disclosure will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions has been enlarged, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0027] This disclosure provides some embodiments of miniature LED devices. (Refer to...) Figures 1 to 5 , Figures 1 to 5 These are schematic diagrams showing the structure of a micro LED device according to one embodiment of the present disclosure.

[0028] Reference Figure 1 , Figure 1 This is a schematic diagram illustrating the structure of a microLED 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 including a micro-LED chip 11, the micro-LED chip 11 including a micro-LED unit array 111 composed of multiple micro-LED units 1111; a first partition layer 101, the first partition layer 101 being disposed on the light-emitting side of the micro-LED chip 11, the first partition layer 101 including a first through-hole array, the arrangement of the first through-hole array corresponding to the arrangement of the micro-LED unit array 111, wherein... The first via array includes multiple sets of first vias, each set including three first vias, the three first vias including a first first via 10111, a second first via 10112, and a third first via 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 filling the first first via 10111 in each set of first vias, the second color photoluminescent material layer... 1012 is filled in the second first through-hole 10112 of each group of first through-holes, and the first light-absorbing layer 1013 is filled in the third first through-hole 10113 of each group of first through-holes. The first light-absorbing layer 1013 is used to partially absorb the third color light emitted by the micro LED unit; a second barrier layer 102 is disposed on the first barrier layer 101 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 includes the plurality of groups of first through-holes. The first through-hole corresponds to multiple sets of second through-holes, each set of second through-holes including 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, which fills the third second through-hole 10213 in each set of second through-holes, wherein the first filter layer 1023 only allows light of the third color to pass through.

[0029] It is worth noting that, for clarity, arrowed marker lines are used to indicate the locations of the first and second through holes to distinguish them from the filler material within them. And for clarity and brevity, Figure 1Only a set of first through holes included in the first through hole array and a set of second through holes included in the second through hole array are shown. The set 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 set 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 and second through holes shown, as well as the number of first through holes in each group and the number of second through holes in each group, are only illustrative and are not limited here, as long as they conform to the above correspondence between the first and second through holes.

[0030] According to the technical solution of this embodiment, the first barrier layer 101 is disposed 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 first through-hole array includes a first first through-hole 10111, a second first through-hole 10112, and a third first through-hole 10113. A photoluminescent material layer 1011 of a first color fills the first first through-hole 10111, and a photoluminescent material layer 1012 of a second color fills the second first through-hole 10112. The first light-absorbing layer 10... 13 is filled in the third first through-hole 10113. The second partition layer 102 is disposed on the first partition 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 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. The first filter layer 1023 is filled in the third second through-hole 10213, thereby forming a micro LED device 1.In this micro-LED device 1, the third-color light emitted by the micro-LED unit 1111 of the micro-LED chip 11 excites the material in the first-color photoluminescent material layer 1011 to emit first-color light, and the third-color light emitted by the micro-LED unit 1111 of the micro-LED chip 11 excites the material in the second-color photoluminescent material layer 1012 to emit second-color light. Due to the presence of aligned third first through-holes 10113 and third second through-holes 10213, the first light-absorbing layer 1013 filled in the third first through-hole 10113 aligned with the third second through-hole 10213 can partially absorb the third-color light emitted by the micro-LED unit 1111, and the first light-filtering layer 1023 filled in the third second through-hole 10213 aligned with the third first through-hole 10113 can only allow the third-color light emitted by the micro-LED unit 1111 to pass through, that is, reflect the third-color light emitted by the micro-LED unit. Therefore, by providing a first light-absorbing 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 being directly emitted from the micro-LED device can be reduced. This reduces color deviation and poor color purity caused by light overflow, thereby improving the uniformity of different colors of light emitted from the micro-LED device and enhancing the color purity of the micro-LED. Furthermore, by providing a first light-filtering layer 1023 in the third second through-hole 10213, light other than the third color light emitted by the micro-LED unit 1111 can be prevented from passing through. Thus, after the third color light emitted by the micro-LED unit is reduced by passing through the first light-absorbing layer as described above, other light different from the third color light emitted by the micro-LED unit can be prevented from mixing and being output from the micro-LED device together with the third color light emitted by the micro-LED unit that has passed through the first light-absorbing layer, thereby enhancing the color purity of the micro-LED and 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 other than the corresponding color, which is different from the function of the first light-absorbing layer 1013 in absorbing light.

[0031] According to embodiments of this disclosure, the first barrier layer 101 can function as a grid, and the interior of the grid can be filled with appropriate materials. The materials of the first barrier layer 101 and the second barrier layer 102 can include visible light shielding materials, such as matte materials like black photoresist and reflective materials like metal layers. The materials of the first-color photoluminescent material layer 1011 and the second-color photoluminescent material layer 1012 include at least one of group II-VI quantum dots, group III-V quantum dots, perovskite quantum dots, and carbon quantum dots. The material of the first light-absorbing layer 1013 includes organic dyes, nano-absorbing particles, or inorganic oxides for partially absorbing third-color light, such as zinc oxide nanoparticle photoresist. The material of the first light-filtering layer 1023 includes organic dyes, nano-absorbing particles, or inorganic oxides that only allow third-color light to pass through.

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

[0033] According to embodiments of this disclosure, the materials of the second and third light-absorbing layers include organic dyes, nano-absorbing particles, or inorganic oxides. The transparent material can be, for example, any suitable material such as a transparent resin. The material of the second light-absorbing layer includes organic dyes, nano-absorbing particles, or inorganic oxides for partially absorbing a third color of light. The material of the second light-absorbing layer can be the same as the material of the first light-absorbing layer, such as zinc oxide nanoparticle photoresist.

[0034] like Figure 1 As shown, the first filling portion fills 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 allows only light of the first color to pass through; the second filling portion fills 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 allows only light of the second color to pass through.

[0035] According to the technical solution of this embodiment, when a second light-absorbing layer is filled in the first second through-hole 10211 and / or in the second second through-hole 10212, and when a portion 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 exciting the photoluminescent material layer and leaks through the photoluminescent material layer, the second light-absorbing layer filled in the first second through-hole 10211 and / or in the second second through-hole 10212 can absorb the leaked portion of the third-color light. This reduces the mixing and output of the leaked portion of the third-color light with 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 and thus improving the display effect of the micro-LED device. Furthermore, when the first second through-hole 10211 is filled with a second filter layer 1021 and / or the second second through-hole 10212 is filled with a third filter layer 1022, the second filter layer 1021 only allows light of the first color to pass through, and reflects light of the third color towards the photoluminescent material layer 1011 of the first color. The third filter layer 1022 only allows light of the second color to pass through, and reflects light of, for example, the third color towards the photoluminescent material layer 1012 of the second color. Therefore, the function of the second filter layer 1021 and the third filter layer 1022 is to reflect light other than light of the corresponding color, which is different from the function of the second light-absorbing layer in absorbing light.

[0036] According to embodiments of the present disclosure, the first light-absorbing layer fills a portion of the third first through-hole in each group of first through-holes, and the first light-filtering layer fills the third second through-hole in each group of second through-holes and 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, by filling the third second through hole in each group of second through holes and a portion of the third first through hole in each group of first through holes with the first filter layer, the thickness of the first filter layer can be increased. Therefore, it can further prevent light other than the third color light emitted by the micro LED unit 1111 from passing through. Thus, after the third color light emitted by the micro LED unit is reduced by passing through the first light-absorbing layer as described above, other light different from the third color light emitted by the micro LED unit can be prevented from mixing and being output from the micro LED device together with the third color light emitted by the micro LED unit that has passed through the first light-absorbing layer, thereby improving the color purity of the micro LED and thus improving the display effect of the micro LED device.

[0038] According to embodiments of the present disclosure, the first filter layer fills a portion of the third second through-hole in each group of second through-holes, and the first absorbent layer fills the third first through-hole in each group of first through-holes and 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-absorbing layer into the third first through hole in each group of first through holes and a portion of the third second through hole in each group of second through holes, the thickness of the first light-absorbing layer can be increased, thereby further absorbing the third color light emitted by the micro LED unit 1111. Therefore, the light overflow caused by the third color light emitted by the micro LED unit 1111 directly emanating from the micro LED device can be further reduced, thus reducing the color deviation and poor color purity caused by 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 embodiments of this disclosure, such as Figure 1 As shown, the microLED device 1 further includes an insulating layer 104, which is disposed between the first insulating layer 101 and the microLED chip 11. Furthermore, the microLED chip can be any microLED chip suitable for fabricating the microLED device; for example, the structure of the microLED chip can include a right-mounted structure, a flip-chip structure, or a vertical structure, etc., without limitation. Each microLED unit in the microLED unit array may include an exposed first semiconductor layer on its light-emitting side. Depending on the type of microLED 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. 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. Therefore, the insulating layer 104 can be disposed between the first barrier layer 101 and the first semiconductor layer 11111. Thus, the insulating layer 104 can 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 via, 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 suitable polymeric organic material and inorganic oxide, such as silicon dioxide.

[0041] According to embodiments of this disclosure, such as 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. The third reflective layer 103 is used to reflect light of a first color and light of a 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 light of the first and second colors. For example, the third reflective layer 103 can be a distributed Bragg reflector film formed by alternating stacks of 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 partition 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. 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, a portion of the excited first color light will be emitted towards the micro-LED unit 1111. The third reflective layer 103 can reflect this portion of the first color light towards the first color photoluminescent material layer 1011, thereby increasing the light output of the color corresponding to the photoluminescent material layer, and thus improving the micro-LED chip's performance. The third reflective layer 103 increases the brightness of the LED and prevents the first color light emitted towards the micro-LED unit 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 towards the micro-LED unit 1111. The third reflective layer 103 can reflect this part of the second color light towards the second color photoluminescent material layer 1012, thereby increasing the light output of the color corresponding to the photoluminescent material layer, thus improving the brightness of the micro-LED and preventing the second color light emitted towards the micro-LED unit from interfering with the third color light emitted by the micro-LED unit.

[0043] According to embodiments of this disclosure, the micro-LED device 1 may further include a transparent cover plate disposed on the second partition layer 102. The transparent cover plate serves to protect the structure it covers. The transparent cover plate may include any suitable cover plate such as a glass cover plate, a polyimide cover plate, or a sapphire cover plate.

[0044] According to embodiments of this disclosure, the first color of light refers to light within the wavelength range corresponding to the first color, the second color of light refers to light within the wavelength range corresponding to the second color, and the third color of light refers to light within the wavelength range corresponding to the third color. White light can be synthesized from the light corresponding to the first color, the light corresponding to the second color, and the light corresponding to the third color. 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 embodiments of this disclosure, the micro LED chip structure further includes a driver chip, with one side of the micro LED chip 11 opposite to the light-emitting side disposed on the driver chip. Alternatively, the micro LED chip structure further includes a driver chip and a flexible circuit board, with one side of the micro LED chip 11 opposite to the light-emitting side disposed on the driver chip to form a micro LED module, and the micro LED module disposed on the flexible circuit board via the driver chip.

[0046] Reference Figure 2 , Figure 2 This is a schematic diagram showing the structure of 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 and the micro-LED device 2 is that the micro-LED device 2 further includes: a first reflective layer 201, which is disposed on the second barrier layer 102 and includes a third through-hole array. The third through-hole array includes multiple sets of third through-holes corresponding to the multiple sets of first through-holes and the multiple sets of second through-holes. Each set of third through-holes includes a third through-hole 20111, which is aligned with the third first through-hole 10113 and the third second through-hole 10213. The first reflective layer 201 is used to reflect the third color light emitted by the micro-LED unit 1111. A third filling portion is filled in the third through-hole 20111. The third filling portion includes a fourth filter layer 2011 that only allows the third color light to pass through, a third light-absorbing layer for partially absorbing the third color light, or a transparent material.

[0047] According to embodiments of this disclosure, the material of the first reflective layer 201 includes a distributed Bragg reflector for reflecting a third color of light. The first reflective layer 201 may, for example, be a distributed Bragg reflector formed by alternating stacks of silicon dioxide and titanium dioxide layers. It is noteworthy that although both the first reflective layer 201 and the third reflective layer 103 are distributed Bragg reflectors formed by alternating stacks of silicon dioxide and titanium dioxide layers, the number of silicon dioxide and titanium dioxide layers in the first reflective layer 201 and the thickness of each silicon dioxide and titanium dioxide layer are different from those in the third reflective layer 103. The material of the fourth filter layer 2011 includes organic dyes, nano-absorbing 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-absorbing layer includes organic dyes, nano-absorbing particles, or inorganic oxides for partially absorbing a third color of light, and the material of the third light-absorbing layer may be the same as that of the first light-absorbing layer 1013 and the second light-absorbing layer, for example, it may be zinc oxide nanoparticle photoresist. The transparent material can be, for example, 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 first color photoluminescent material layer 1011 and the second color photoluminescent material layer 1012, when a portion of the third color light emitted by the micro LED unit 1111 does not participate in exciting the photoluminescent material layer and leaks through the photoluminescent material layer, the first reflective layer 201 can reflect the portion of the third color light leaking from the first color photoluminescent material layer 1011 back to the first color photoluminescent material layer 1011 so that it can re-participate in exciting the photoluminescent material layer, and the third color light... A reflective layer 201 can reflect a portion 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-excite the photoluminescent material layer. This increases the amount of light participating in the excitation of the photoluminescent material layer, thereby increasing the amount of light emitted by the corresponding color of the photoluminescent material layer, thus improving the brightness of the micro-LED. It can also reduce the mixing output of the leaked light and the different colors of light emitted by the excitation of the photoluminescent material layer, thereby improving the color purity of the micro-LED and thus 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 a fourth light-filtering layer 2011, light other than that 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-absorbing layer as described above, other light different from that emitted by the micro-LED unit can be prevented from mixing and being output from the micro-LED device along with the light emitted by the micro-LED unit that has passed through the first light-absorbing layer, thereby improving the color purity of the micro-LED and thus enhancing 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 a third light-absorbing layer, this third light-absorbing layer can partially absorb light of a third color, such as blue light, emitted by the micro-LED unit 1111 corresponding to the first light-absorbing layer 1013. This further reduces blue light over-emission caused by the direct emission of blue light 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 may be disposed on the first reflective layer 201.

[0051] Reference Figure 3 , Figure 3 This is a schematic diagram showing the structure of a microLED 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 further includes a fourth light-absorbing layer 301, which is disposed between the first barrier layer 101 and the second barrier layer 102, wherein the fourth light-absorbing layer 301 is used to partially absorb the third color light emitted by the micro LED unit.

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

[0053] According to the technical solution of this embodiment, the fourth light-absorbing layer 301 covers the first light-absorbing layer 1013. Therefore, the fourth light-absorbing layer 301 can partially absorb the third color light emitted by the micro-LED unit 1111 corresponding to the first light-absorbing layer 1013, thereby further reducing the light overflow caused by the third color light emitted directly from the micro-LED device, thus further improving the display effect of the micro-LED device. Furthermore, since the fourth light-absorbing layer 301 covers the first color photoluminescent material layer 1011 and the second color photoluminescent material layer 1012, when a portion of the third color light emitted by the micro-LED unit corresponding to these two photoluminescent material layers does not participate in exciting the photoluminescent material layer and leaks through the photoluminescent material layer, the fourth light-absorbing layer 301 can absorb the leaked portion of the third color light. This reduces the mixing and output of the leaked third color light with the first and second color light emitted by exciting the photoluminescent material layer, thereby improving the color purity of the micro-LED and thus improving the display effect of the micro-LED device.

[0054] Reference Figure 4 , Figure 4 This is a schematic diagram showing the structure of 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 and the micro-LED device 4 is that the micro-LED device 4 further includes: a second reflective layer 401, which is disposed 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 sets of fourth through-holes corresponding to the multiple sets of first through-holes and the multiple sets of second through-holes. Each set of fourth through-holes includes a fourth through-hole 40111, which is aligned with the third first through-hole 10113 and the third second through-hole 10213. The second reflective layer 401 is used to reflect the third color light emitted by the micro-LED unit 1111. A fourth filling portion is filled in the fourth through-hole 40111. The fourth filling portion includes a fifth filter layer 4011 that only allows the third color light to pass through, a fifth light-absorbing layer for partially absorbing the third color light, or a transparent material.

[0055] According to embodiments of this disclosure, the material of the second reflective layer 401 includes a distributed Bragg reflector for reflecting a third color of light, and the material of the second reflective layer 401 can be the same as the material of the first reflective layer 201. For example, the second reflective layer 401 can be a distributed Bragg reflector formed by alternating stacks of silicon dioxide and titanium dioxide layers. The material of the fifth filter layer 4011 includes organic dyes, nano-absorbing particles, or inorganic oxides, and the material of the fifth filter layer 4011 can be the same as the material of the first filter layer 1023 and the fourth filter layer 2011. The material of the fifth light-absorbing layer includes organic dyes, nano-absorbing particles, or inorganic oxides for partially absorbing a third color of light, and the material of the fifth light-absorbing layer can be the same as the material of the first light-absorbing layer 1013, the second light-absorbing layer, the third light-absorbing layer, and the fourth light-absorbing layer, for example, zinc oxide nanoparticle photoresist. The transparent material can be any suitable material, such as transparent resin.

[0056] According to the technical solution of this embodiment, on the one hand, since the second reflective layer 401 covers the first color photoluminescent material layer 1011 and the second color photoluminescent material layer 1012, when a portion of the third color light emitted by the micro LED unit 1111 does not participate in exciting the photoluminescent material layer and leaks through the photoluminescent material layer, the second reflective layer 401 can reflect the portion of the third color light leaking from the first color photoluminescent material layer 1011 back to the first color photoluminescent material layer 1011 and re-participate in exciting the photoluminescent material layer, and the third color light... The second reflective layer 401 can reflect a portion of the third-color light leaking from the second-color photoluminescent material layer 1012 back to the second-color photoluminescent material layer 1012, allowing it to re-excite the photoluminescent material layer. This increases the amount of light participating in the excitation of the photoluminescent material layer, thereby increasing the amount of light emitted by the corresponding color of the photoluminescent material layer and improving the brightness of the micro-LED. Furthermore, it can reduce the mixing output of the leaked light and the different colors emitted by the excitation of the photoluminescent material layer, thereby improving the color purity of the micro-LED and thus enhancing the display effect of the micro-LED device.

[0057] On the other hand, when the fourth through-hole 40111, aligned with the third first through-hole 10113 and the third second through-hole 10213, is filled with a fifth light-absorbing layer 4011, light other than that 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-absorbing layer as described above, other light different from that emitted by the micro-LED unit can be prevented from mixing and being output from the micro-LED device along with the light emitted by the micro-LED unit that has passed through the first light-absorbing layer, thereby improving the color purity of the micro-LED and thus enhancing the display effect of the micro-LED device. When the fourth through-hole 40111, aligned with the third first through-hole 10113 and the third second through-hole 10213, is filled with a fifth light-absorbing layer, this fifth light-absorbing layer can partially absorb light of a third color, such as blue light, emitted by the micro-LED unit 1111 corresponding to the first light-absorbing layer 1013. This further reduces blue light overflow caused by the direct emission of blue light from the micro-LED device, thereby further improving the display effect of the micro-LED device.

[0058] Reference Figure 5 , Figure 5 This is a schematic diagram showing the structure of 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 between the micro LED device 4 shown is that the micro LED device 5 further includes a sixth light-absorbing layer 501, which is disposed between the first barrier layer 101 and the second reflective layer 401, wherein the sixth light-absorbing layer 501 is used to partially absorb the third color light emitted by the micro LED unit.

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

[0060] According to the technical solution of this embodiment, the sixth light-absorbing layer 501 covers the first light-absorbing layer 1013. Therefore, the sixth light-absorbing layer 501 can partially absorb the third color light emitted by the micro-LED unit 1111 corresponding to the first light-absorbing layer 1013, thereby further reducing the light overflow caused by the third color light emitted directly from the micro-LED device, thus further improving the display effect of the micro-LED device. Furthermore, since the sixth light-absorbing layer 501 covers the first color photoluminescent material layer 1011 and the second color photoluminescent material layer 1012, when a portion of the third color light emitted by the micro-LED unit corresponding to these two photoluminescent material layers does not participate in exciting the photoluminescent material layer and leaks through the photoluminescent material layer, the sixth light-absorbing layer 501 can absorb the leaked portion of the third color light. This reduces the mixing and output of the leaked third color light with the first and second color light emitted by exciting the photoluminescent material layer, thereby improving the color purity of the micro-LED and thus improving the display effect of the micro-LED device.

[0061] According to embodiments of this disclosure, the pixel size in the aforementioned micro-LED device is typically less than 50 micrometers.

[0062] This disclosure also provides a display device including the aforementioned LED device. This 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 a projection part of an electronic device, such as a projector or head-up display (HUD); or, for example, the micro-LED device can be a display part of an electronic device, such as a smartphone, smartwatch, laptop, tablet, dashcam, navigator, head-mounted device, or any device with a display screen.

[0063] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0064] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above steps / processes do not imply a sequential order of execution; 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 embodiments of this application. Moreover, the above embodiment numbers are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0065] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0066] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A miniature LED device, wherein, The micro LED device includes: A micro LED chip structure, wherein the micro LED chip structure includes a micro LED chip, and the micro LED chip includes a micro LED unit array composed of multiple micro LED units; A first barrier layer is disposed on the light-emitting side of the micro LED chip. The first barrier layer includes a first through-hole array, the arrangement of which corresponds to the arrangement of the micro LED unit array. The first through-hole array includes multiple sets of first through-holes, each set of which includes three first through-holes, the three first through-holes including a first first through-hole, a second first through-hole, and a third first through-hole. The microLED unit comprises a first-color photoluminescent material layer, a second-color photoluminescent material layer, and a first light-absorbing layer. The first-color photoluminescent material layer fills the first through-hole in each group of first through-holes, the second-color photoluminescent material layer fills the second through-hole in each group of first through-holes, and the first light-absorbing layer fills the third through-hole in each group of first through-holes. The first light-absorbing layer is used to partially absorb the third-color light emitted by the microLED unit. A second partition layer is disposed on the first partition layer and includes a second through-hole array. The second through-hole array is aligned with the first through-hole array. The second through-hole array includes multiple sets of second through-holes corresponding to the multiple sets of first through-holes. Each set 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 is filled in the third second through-hole of each group of second through-holes, wherein the first filter layer allows only light of the third color to pass through.

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

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

5. The micro LED device according to claim 1 or 2, wherein, The micro LED device also includes: A first reflective layer is disposed on the second partition layer and includes a third through-hole array. The third through-hole array includes multiple sets of third through-holes corresponding to the multiple sets of first through-holes and the multiple sets of second through-holes. Each set of third through-holes includes one third through-hole. The third through-hole is aligned with the third first through-hole and the third second through-hole. The first reflective layer is used to reflect a third color of light emitted by the micro LED unit. The third filling portion fills the third through hole, and the third filling portion 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 disposed between the first barrier layer and the second barrier layer, wherein the fourth light-absorbing layer is used to partially absorb the third color light emitted by the micro-LED unit.

7. The micro LED device according to claim 1 or 2, wherein, The micro LED device also includes: A second reflective layer is disposed between the first partition layer and the second partition layer and includes a fourth through-hole array. The fourth through-hole array includes multiple sets of fourth through-holes corresponding to the multiple sets of first through-holes and the multiple sets of second through-holes. Each set of fourth through-holes includes one fourth through-hole. The fourth through-hole is aligned with the third first through-hole and the third second through-hole. The second reflective layer is used to reflect a third color of light emitted by the micro LED unit. A fourth filling portion, which fills the fourth through hole, and the fourth filling portion includes a transparent material.

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

9. The micro LED device according to claim 1 or 2, wherein, The micro-LED device further includes an insulating layer disposed between the first barrier layer and the micro-LED chip.

10. The micro LED device according to claim 1 or 2, 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 microLED unit in the microLED unit array includes a first semiconductor layer on the light-emitting side, and the insulating layer is disposed between the first barrier layer and the first semiconductor layer.

12. The micro LED device according to claim 1, wherein, The micro LED device also includes a transparent cover plate, which is disposed on the second partition layer.

13. The micro LED device according to claim 1 or 2, wherein, White light is obtained by combining light corresponding to the first color, light corresponding to the second color, and light corresponding to the third color, wherein the first color is red, the second color is green, and the third color is blue.

14. The micro LED device according to claim 1 or 2, wherein, The micro LED chip structure also includes a driver chip, with one side of the micro LED chip opposite to the light-emitting side disposed on the driver chip. Alternatively, the micro LED chip structure may further include a driver chip and a flexible circuit board. The side of the micro LED chip opposite to the light-emitting side is disposed on the driver chip to form a micro LED module, and the micro LED module is disposed on the flexible circuit board through the driver chip.

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

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

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