Micro light-emitting device display panel

Abstract

According to the micro light-emitting device display panel, a first groove, a second groove and a third groove are formed in a metal reflecting layer in an array mode, the first groove is located in the first direction of a first blue light-emitting device, and the second groove is located in the first direction of a second blue light-emitting device; the third groove is located in the first direction of the third blue light emitting device, the color conversion layer comprises a first color conversion part, a second color conversion part and a transparent filling part, the first groove is filled with the first color conversion part, the second groove is filled with the second color conversion part, and the third groove is filled with the transparent filling part; compared with a conventional scheme, the first color conversion part is filled in the first groove, and the second color conversion part is filled in the second groove, so that the problem that the first color conversion part and the second color conversion part form an undercut structure when the color conversion layer is patterned is avoided, and the manufacturing yield of the micro light-emitting device display panel is improved.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a micro-light-emitting device display panel. Background Technology

[0002] The micro-light-emitting diode (MSLED) display panel is a type of display panel that uses Si-uLED (silicon-based micro-light-emitting diode) display technology. MSLED display panels offer advantages such as high brightness and high contrast. To achieve full-color display, conventional solutions require forming a color conversion layer on the light-emitting diode layer, followed by patterning the color conversion layer. However, during the patterning process, the resulting color conversion section is prone to undercutting, leading to a decrease in the yield rate of the MSLED display panel. Utility Model Content

[0003] The embodiments of this application provide a micro-light-emitting device display panel to improve the yield of the micro-light-emitting device display panel.

[0004] Embodiments of this application provide a micro-light-emitting device display panel, comprising:

[0005] substrate;

[0006] A blue light-emitting device layer is disposed on the substrate, and the blue light-emitting device layer includes an array of first blue light-emitting devices, second blue light-emitting devices and third blue light-emitting devices;

[0007] A first encapsulation layer, the first encapsulation layer covering the blue light-emitting device layer;

[0008] A metal reflective layer is disposed on the side of the first encapsulation layer away from the substrate. A first groove, a second groove, and a third groove are arrayed on the metal reflective layer. The first groove is located in a first direction of the first blue light-emitting device, the second groove is located in a first direction of the second blue light-emitting device, and the third groove is located in a first direction of the third blue light-emitting device. The orthographic projections of the first groove, the second groove, and the third groove in the first direction respectively cover the first blue light-emitting device, the second blue light-emitting device, and the third blue light-emitting device.

[0009] A color conversion layer is disposed on the surface of the first encapsulation layer away from the substrate. The color conversion layer includes a first color conversion portion, a second color conversion portion, and a transparent filling portion. The first color conversion portion fills the first groove, the second color conversion portion fills the second groove, and the transparent filling portion fills the third groove.

[0010] A second encapsulation layer is disposed on the side of the color conversion layer away from the substrate, and the second encapsulation layer covers the color conversion layer.

[0011] Furthermore, the area of ​​the opening on the side of the first groove away from the substrate is greater than the area of ​​the opening on the side of the first groove close to the substrate, and the area of ​​the opening on the side of the second groove away from the substrate is greater than the area of ​​the opening on the side of the second groove close to the substrate.

[0012] Furthermore, in the top view of the micro-light-emitting device display panel, the edge of the surface of the first color conversion part near the substrate is located inside the first blue light-emitting device, and the edge of the surface of the first color conversion part away from the substrate extends beyond the edge of the first blue light-emitting device. The edge of the surface of the second color conversion part near the substrate is located inside the second blue light-emitting device, and the edge of the surface of the second color conversion part away from the substrate extends beyond the edge of the second blue light-emitting device.

[0013] Furthermore, in the first direction of the micro-light-emitting device display panel, the thickness of the first color conversion portion is not less than the depth of the first groove, and the thickness of the second color conversion portion is not less than the depth of the second groove.

[0014] Furthermore, the micro-light-emitting device display panel also includes a protective layer that covers the metal reflective layer, wherein the color conversion layer is located on a surface of the protective layer away from the substrate.

[0015] Furthermore, the thickness of the protective layer is less than the thickness of the second encapsulation layer.

[0016] Furthermore, the material of the protective layer includes aluminum oxide.

[0017] Furthermore, in the first direction of the micro-light-emitting device display panel, the cross-section of the first color conversion part is an inverted trapezoid, the cross-section of the second color conversion part is an inverted trapezoid, and the cross-section of the transparent filling part is an inverted trapezoid.

[0018] Furthermore, the sidewall of the first color conversion part is a first arc-shaped concave surface, and the center of curvature of the first arc-shaped concave surface is on the same side as the center of the first color conversion part; the sidewall of the second color conversion part is a second arc-shaped concave surface, and the center of curvature of the second arc-shaped concave surface is on the same side as the center of the second color conversion part; the sidewall of the transparent filling part is a third arc-shaped concave surface, and the center of curvature of the third arc-shaped concave surface is on the same side as the center of the transparent filling part.

[0019] Furthermore, the sidewall of the first color conversion part is an inclined surface, the sidewall of the second color conversion part is an inclined surface, and the sidewall of the transparent filling part is an inclined surface.

[0020] The beneficial effects of this application are:

[0021] This application provides a micro-light-emitting device display panel, which comprises an array of first, second, and third grooves arranged on a metal reflective layer. The first groove is located in a first direction of a first blue light-emitting device, the second groove is located in a first direction of a second blue light-emitting device, and the third groove is located in a first direction of a third blue light-emitting device. The orthographic projections of the first, second, and third grooves in the first direction respectively cover the first, second, and third blue light-emitting devices. The color conversion layer includes a first color conversion part, a second color conversion part, and a transparent filling part. The first color conversion part fills the... The second color conversion part is filled in the first groove, and the transparent filling part is filled in the third groove. Compared with the conventional solution, since the first color conversion part is filled in the first groove and the second color conversion part is filled in the second groove, the problem of the first color conversion part and the second color conversion part forming an undercut structure during the patterned color conversion layer is avoided, thereby improving the manufacturing yield of the micro-light-emitting device display panel. Furthermore, since the first groove, the second groove and the third groove are made on the metal reflective layer, crosstalk between the light of two adjacent pixels of the micro-light-emitting device display panel can be avoided on the one hand, and the display brightness of the micro-light-emitting device display panel can be improved on the other hand. Attached Figure Description

[0022] Figure 1 This is a top view of the micro-light-emitting device display panel of this application;

[0023] Figure 2 This is a schematic diagram of the first structure of the micro-light-emitting device display panel of this application;

[0024] Figure 3 yes Figure 2 The diagram shown illustrates the structure of a micro-light-emitting device display panel without a color conversion layer.

[0025] Figure 4 This is a schematic diagram of the first structure of the micro-light-emitting device display panel of this application.

[0026] 10 - Micro-light-emitting device display panel; 100 - Substrate; 200 - Blue light-emitting device layer, 210 - First blue light-emitting device, 220 - Second blue light-emitting device, 230 - Third blue light-emitting device; 300 - First encapsulation layer, 310 - First sub-layer, 320 - Second sub-layer; 400 - Metal reflective layer, 410 - First groove, 420 - Second groove, 430 - Third groove; 500 - Color conversion layer, 510 - First color conversion part, 520 - Second color conversion part, 530 - Transparent filling part; 600 - Second encapsulation layer; 700 - Protective layer. Detailed Implementation

[0027] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings. The technical solutions described below are for illustrative purposes only and should not be construed as limiting the scope of protection of this application.

[0028] Furthermore, the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different technical features. The terms "multiple" and similar words indicate two or more unless otherwise expressly specified.

[0029] Embodiments of this application provide a micro-light-emitting device display panel, see reference. Figures 1-3 The micro-light-emitting device display panel 10 includes a substrate 100, a blue light-emitting device layer 200, a first encapsulation layer 300, a metal reflective layer 400, a color conversion layer 500, and a second encapsulation layer 600.

[0030] Specifically, a blue light-emitting device layer 200 is disposed on the substrate 100, and the blue light-emitting device layer 200 includes an array of first blue light-emitting devices 210, second blue light-emitting devices 220, and third blue light-emitting devices 230; a first encapsulation layer 300 covers the blue light-emitting device layer 200; a metal reflective layer 400 is disposed on the side of the first encapsulation layer 300 away from the substrate 100, and a first groove 410, a second groove 420, and a third groove 430 are arrayed on the metal reflective layer 400, wherein the first groove 410 is located in a first direction M of the first blue light-emitting device 210, the second groove 420 is located in a first direction M of the second blue light-emitting device 220, and the third groove 430 is located in a first direction M of the third blue light-emitting device 230, and... The first groove, the second groove, and the third groove, projected onto the first direction M, respectively cover the first blue light-emitting device, the second blue light-emitting device, and the third blue light-emitting device. The color conversion layer 500 is disposed on the surface of the first encapsulation layer 300 away from the substrate 100. The color conversion layer 500 includes a first color conversion part 510, a second color conversion part 520, and a transparent filling part 530. The first color conversion part 510 fills the first groove 410, the second color conversion part 520 fills the second groove 420, and the transparent filling part 530 fills the third groove 430. The second encapsulation layer 600 is disposed on the side of the color conversion layer 500 away from the substrate 100, and the second encapsulation layer 600 covers the color conversion layer 500.

[0031] In conventional solutions, a color conversion layer 500 needs to be formed on the light-emitting device layer of the micro-light-emitting device display panel 10, and then the color conversion layer 500 is patterned. However, when the color conversion layer 500 is patterned, the formed color conversion part is prone to undercut structure, which leads to a decrease in the yield of the micro-light-emitting device display panel 10. By arraying a first groove 410, a second groove 420, and a third groove 430 on a metal reflective layer 400, where the first groove 410 is located in a first direction M of the first blue light-emitting device 210, the second groove 420 is located in a first direction M of the second blue light-emitting device 220, and the third groove 430 is located in a first direction M of the third blue light-emitting device 230, the color conversion layer 500 includes a first color conversion part 510, a second color conversion part 520, and a transparent filling part 530. The first color conversion part 510 fills the first groove 410, the second color conversion part 520 fills the second groove 420, and the transparent filling part 530 fills the third groove 430. Compared with conventional solutions, since the first color conversion part 510 fills the first groove 410, the color conversion part 420 fills the second groove 420, and the transparent filling part 530 fills the third groove 430, the color conversion layer 500 is more efficient. Within the groove 410, the second color conversion part 520 fills the second groove 420, avoiding the problem of the first color conversion part 510 and the second color conversion part 520 forming an undercut structure when the patterned color conversion layer 500 is applied, thereby improving the manufacturing yield of the micro-light-emitting device display panel 10. Furthermore, since the first groove 410, the second groove 420, and the third groove 430 are fabricated on the metal reflective layer, crosstalk between the light from two adjacent pixels of the micro-light-emitting device display panel can be avoided on the one hand, and the display brightness of the micro-light-emitting device display panel can be improved on the other hand. At the same time, since the transparent filling part 530 fills the third groove 430 instead of the color conversion part filled with blue quantum dot material, the original brightness of the third blue light-emitting device 230 is not reduced.

[0032] In this embodiment, the first groove 410, the second groove 420, and the third groove 430 have the same shape and the same volume.

[0033] In this embodiment, the color of the first color conversion unit 510 is red, and the color of the second color conversion unit 520 is green.

[0034] In this embodiment, the material of the first color conversion unit 510 is red quantum dot material, and the material of the second color conversion unit 520 is green quantum dot material.

[0035] In this embodiment, the material of the transparent filler portion 530 is transparent photoresist.

[0036] In this embodiment, the material of the metal reflective layer 400 includes one of aluminum, aluminum nitride, or silver.

[0037] In this embodiment, the thickness of the metal reflective layer 400 is not less than 2 μm.

[0038] In this embodiment, the material of the first encapsulation layer 300 includes silicon dioxide or silicon nitride.

[0039] In this embodiment, the material of the second encapsulation layer 600 includes silicon dioxide or silicon nitride.

[0040] In this embodiment, reference Figure 2 , Figure 4 The area of ​​the opening on the side of the first groove 410 away from the substrate 100 is larger than the area of ​​the opening on the side of the first color conversion part 510 close to the substrate 100, and the area of ​​the opening on the side of the second color conversion part 520 away from the substrate 100 is larger than the area of ​​the opening on the side of the second color conversion part 520 close to the substrate 100. By setting the area of ​​the opening on the side of the first groove 410 away from the substrate 100 to be larger than the area of ​​the opening on the side of the first color conversion part 510 close to the substrate 100, and the area of ​​the opening on the side of the second color conversion part 520 away from the substrate 100 to be larger than the area of ​​the opening on the side of the second color conversion part 520 close to the substrate 100, the surface area of ​​the first color conversion part 510 on the side away from the substrate 100 filling the first groove 410 is larger than the surface area of ​​the first color conversion part 510 on the side of the substrate 100 filling the second groove 420, and the area of ​​the second color conversion part 520 on the side of the second color conversion part 520 filling the second groove 420 is larger than the surface area of ​​the first color conversion part 510 close to the substrate 100 filling the first groove 410. The area of ​​the surface away from the substrate 100 is greater than the area of ​​the surface of the second color conversion unit 520 near the substrate 100. As a result, while the light emitted by the first blue light emitting device 210 received by the first color conversion unit 510 near the substrate 100 and the second blue light emitting device 220 received by the second color conversion unit 520 near the substrate 100 remains unchanged, the light conversion of the first color conversion unit 510 and the second color conversion unit 520 can be increased, and the risk of light leakage from the first blue light emitting device 210 and the second blue light emitting device 220 can be reduced.

[0041] In this embodiment, reference Figure 2 In the first part of the micro-light-emitting device display panel 10, the cross-section of the first color conversion part 510 is an inverted trapezoid, the cross-section of the second color conversion part 520 is an inverted trapezoid, and the cross-section of the transparent filling part 530 is an inverted trapezoid.

[0042] In this embodiment, in the top view of the micro-light-emitting device display panel 10, the edge of the surface of the first color conversion part 510 on the side near the substrate 100 is located inside the first blue light-emitting device 210, and the edge of the surface of the first color conversion part 510 on the side away from the substrate 100 exceeds the edge of the first blue light-emitting device 210. The edge of the surface of the second color conversion part 520 on the side near the substrate 100 is located inside the second blue light-emitting device 220, and the edge of the surface of the second color conversion part 520 on the side away from the substrate 100 exceeds the edge of the second blue light-emitting device 220.

[0043] In this embodiment, reference Figure 2 , Figure 4 In the first direction M of the micro-light-emitting device display panel 10, the thickness of the first color conversion part 510 is not less than the depth of the first groove 410, and the thickness of the second color conversion part 520 is not less than the depth of the second groove 420. By setting the thickness of the first color conversion part 510 to be not less than the depth of the first groove 410 and the thickness of the second color conversion part 520 to be not less than the depth of the second groove 420, it is ensured that there is enough red quantum dot material in the first groove 410 for converting light, and enough green quantum dot material in the second groove 420 for converting light, thereby further reducing the risk of light leakage from the first blue light-emitting device 210 and the second blue light-emitting device 220.

[0044] In this embodiment, in the first direction M of the micro-light-emitting device display panel 10, the thickness of the first color conversion part 510 is equal to the depth of the first groove 410, and the thickness of the second color conversion part 520 is equal to the depth of the second groove 420.

[0045] In this embodiment, in the first direction M of the micro-light-emitting device display panel 10, the thickness of the first color conversion part is greater than the depth of the first groove 410, and the thickness of the second color conversion part is greater than the depth of the second groove 420.

[0046] In this embodiment, in the first direction M of the micro-light-emitting device display panel 10, the thickness of the first color conversion part is greater than the thickness of the metal reflective layer 400, and the thickness of the second color conversion part is greater than the thickness of the metal reflective layer 400.

[0047] In this embodiment, reference Figure 2 , Figure 4 The micro-light-emitting device display panel 10 also includes a protective layer 700 covering the metal reflective layer 400, wherein the color conversion layer 500 is located on a surface of the protective layer 700 away from the substrate 100. By providing a protective layer 700 covering the metal reflective layer 400, wherein the color conversion layer 500 is located on a surface of the protective layer 700 away from the substrate 100, the protective layer 700 can isolate the metal reflective layer 400, preventing the color conversion layer 500 from corroding the metal reflective layer 400 during the fabrication of the color conversion layer 500.

[0048] In this embodiment, the thickness of the protective layer 700 is not less than Preferably, the thickness of the protective layer 700 is... or

[0049] In this embodiment, the thickness of the protective layer 700 is less than the thickness of the second encapsulation layer 600. By setting the thickness of the protective layer 700 to be less than the thickness of the second encapsulation layer 600, it is possible to avoid the protective layer 700 being too thick and occupying the volume of the first groove 410 and the second groove 420, thereby preventing a reduction in the quantum dot material filled in the first groove 410 and the second groove 420, and thus reducing the risk of light leakage from the first blue light emitting device 210 and the second blue light emitting device 220.

[0050] In this embodiment, the protective layer 700 is made of aluminum oxide. By using aluminum oxide as the material for the protective layer 700, the aluminum oxide film layer has better density, thereby ensuring that the protective layer 700 can better protect the metal reflective layer 400.

[0051] In this embodiment, reference Figure 4 The sidewall of the first color conversion part 510 is a first arc-shaped concave surface, and the center of curvature of the first arc-shaped concave surface is on the same side as the center of the first color conversion part 510. The sidewall of the second color conversion part 520 is a second arc-shaped concave surface, and the center of curvature of the second arc-shaped concave surface is on the same side as the center of the second color conversion part 520. The sidewall of the transparent filling part 530 is a third arc-shaped concave surface, and the center of curvature of the third arc-shaped concave surface is on the same side as the center of the transparent filling part 530. By setting the sidewall of the first color conversion part 510 to a first arc-shaped concave surface, and the center of curvature of the first arc-shaped concave surface to be on the same side as the center of the first color conversion part 510, the sidewall of the second color conversion part 520 to a second arc-shaped concave surface, and the center of curvature of the second arc-shaped concave surface to be on the same side as the center of the second color conversion part 520, and the sidewall of the transparent filling part 530 to a third arc-shaped concave surface, and the center of curvature of the third arc-shaped concave surface to be on the same side as the center of the transparent filling part 530, compared to the scheme where the sidewall of the first color conversion part 510 is a slope, the sidewall of the second color conversion part 520 is a slope, and the sidewall of the transparent filling part 530 is a slope, it can increase the quantum dot material filled in the first groove 410 and the second groove 420, and increase the reflective area of ​​the metal reflective layer 400, thereby improving the light emission efficiency of the micro-light-emitting device display panel 10.

[0052] In this embodiment, reference Figure 2 The sidewalls of the first color conversion part 510 are sloped, the sidewalls of the second color conversion part 520 are sloped, and the sidewalls of the transparent filling part 530 are sloped.

[0053] In this embodiment, reference Figure 2 , Figure 4The first encapsulation layer 300 includes a first sublayer 310 and a second sublayer 320. The first sublayer 310 is located between two adjacent blue light-emitting devices, and the second sublayer 320 covers the blue light-emitting device layer 200. The blue light-emitting devices include a first blue light-emitting device 210, a second blue light-emitting device 220, or a third blue light-emitting device 230.

[0054] In this embodiment, the thickness of the second sub-layer 320 is not less than Preferably, the thickness of the second sublayer 320 is or

[0055] The specific embodiments of this application have been described in detail above. The embodiments disclosed above are merely preferred embodiments of this application. Those skilled in the art can make many modifications and improvements without departing from the concept of this application. All such modifications and improvements fall within the scope of protection defined by the claims of this application.

Claims

1. A micro light emitting diode display panel, characterized in that, The micro light emitting diode display panel comprises: a substrate; a blue light emitting device layer disposed on the substrate, the blue light emitting device layer comprising a first blue light emitting device, a second blue light emitting device and a third blue light emitting device arranged in an array; a first encapsulation layer covering the blue light emitting device layer; a metal reflective layer disposed on a side of the first encapsulation layer distal from the substrate, the metal reflective layer having first, second, and third recesses arranged in an array, the first recess being located in a first direction of the first blue light emitting device the second recess being located in a first direction of the second blue light emitting device, the third recess being located in a first direction of the third blue light emitting device, and the first, second, and third recesses having orthographic projections in the first direction that cover the first, second, and third blue light emitting devices, respectively; a color conversion layer disposed on a surface of the first encapsulation layer away from the substrate, the color conversion layer comprising a first color conversion part, a second color conversion part and a transparent filling part, the first color conversion part being filled in the first groove, the second color conversion part being filled in the second groove, and the transparent filling part being filled in the third groove; a second encapsulation layer disposed on a side of the color conversion layer away from the substrate, and the second encapsulation layer covering the color conversion layer. 2.The micro light emitting diode display panel of claim 1, wherein, An area of an opening of the first groove away from the substrate is greater than an area of an opening of the first groove close to the substrate, and an area of an opening of the second groove away from the substrate is greater than an area of an opening of the second groove close to the substrate. 3.The micro light emitting diode display panel of claim 1, wherein, In a top view of the micro light emitting diode display panel, an edge of a surface of the first color conversion part close to the substrate is located within the first blue light emitting device, an edge of a surface of the first color conversion part away from the substrate exceeds an edge of the first blue light emitting device, an edge of a surface of the second color conversion part close to the substrate is located within the second blue light emitting device, and an edge of a surface of the second color conversion part away from the substrate exceeds an edge of the second blue light emitting device. 4.The micro light emitting diode display panel of claim 1, wherein, In a first direction of the micro light emitting diode display panel, a thickness of the first color conversion part is not less than a depth of the first groove, and a thickness of the second color conversion part is not less than a depth of the second groove. 5.The micro light emitting diode display panel of claim 1, wherein, The micro light emitting diode display panel further comprises a protective layer covering the metal reflection layer, wherein the color conversion layer is located on a surface of the protective layer away from the substrate. 6.The micro light emitting diode display panel of claim 5, wherein, A thickness of the protective layer is less than a thickness of the second encapsulation layer.

7. The micro light emitting device display panel of claim 5 or 6, wherein, A material of the protective layer comprises aluminum oxide. 8.The micro light emitting diode display panel of claim 1, wherein, In the first direction of the micro light emitting diode display panel, a cross section of the first color conversion part is in an inverted trapezoidal shape, a cross section of the second color conversion part is in an inverted trapezoidal shape, and a cross section of the transparent filling part is in an inverted trapezoidal shape. 9.The micro light emitting diode display panel of claim 1, wherein, A side wall of the first color conversion part is a first arc-shaped concave surface, a center of curvature of the first arc-shaped concave surface and a center of the first color conversion part are located on the same side, a side wall of the second color conversion part is a second arc-shaped concave surface, a center of curvature of the second arc-shaped concave surface and a center of the second color conversion part are located on the same side, and a side wall of the transparent filling part is a third arc-shaped concave surface, a center of curvature of the third arc-shaped concave surface and a center of the transparent filling part are located on the same side. 10.The micro light emitting diode display panel of claim 1, wherein, The side wall of the first color conversion part is a slope, the side wall of the second color conversion part is a slope, and the side wall of the transparent filling part is a slope.

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