A display panel, a manufacturing method thereof and a display device

Abstract

The embodiment of the present invention discloses a display panel, a preparation method thereof and a display device, wherein the display panel comprises: an array substrate, the array substrate comprises an electrode and a first reflection groove; an LED, located on one side of the array substrate, the electrode comprises a first electrode, the first electrode is electrically connected to the LED; the orthographic projection of the LED on the array substrate overlaps at least partially with the first electrode; the orthographic projection of the first reflection groove on the surface of the array substrate is adjacent to the orthographic projection of the LED and / or the electrode on the surface of the array substrate. The embodiment of the present invention solves the problem of excessively high alignment accuracy requirements in the LED transfer process of the existing display panel, and can avoid excessive invalid LEDs due to insufficient alignment accuracy during the transfer process. At the same time, the first reflection groove can also be used to reflect part of the light emitted by the LED and emit it from the front of the display panel, thereby improving the utilization rate of the LED light and ensuring the light-emitting viewing angle and light-emitting efficiency of the display panel.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technology, and in particular to a display panel, a manufacturing method thereof, and a display device. Background Art

[0002] Flat panel display devices have the advantages of high image quality, power saving, thin body and wide application range, and are widely used in various consumer electronic products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, desktop computers, etc., becoming the mainstream of display devices.

[0003] A light-emitting diode (LED) display panel is a display that uses an LED array integrated on a substrate as display pixels to display images. Each LED pixel can be addressed and driven to light up individually. Compared with OLED displays, LED displays have the advantages of better material stability, longer life, and no image burn-in, and are considered to be the biggest competitor of OLED displays. Summary of the invention

[0004] The present invention provides a display panel, a preparation method thereof and a display device, so as to solve the problem that it is difficult to align the LED on the display substrate while ensuring the light extraction efficiency of the LED.

[0005] In a first aspect, an embodiment of the present invention provides a display panel, including:

[0006] An array substrate, the array substrate comprising electrodes and a first reflective groove;

[0007] The LED is located on one side of the array substrate, and the electrode includes a first electrode, which is electrically connected to the LED; the orthographic projection of the LED on the array substrate at least partially overlaps with the first electrode;

[0008] The orthographic projection of the first reflective groove on the surface of the array substrate is adjacent to the orthographic projection of the LED and / or the electrode on the surface of the array substrate.

[0009] In a second aspect, an embodiment of the present invention further provides a method for manufacturing a display panel, the method comprising:

[0010] Providing an array substrate, wherein the array substrate is provided with electrodes, and the electrodes include a first electrode;

[0011] An LED is arranged on one side of the array substrate, and the LED is electrically connected to the first electrode, and the orthographic projection of the LED on the array substrate at least partially overlaps with the first electrode;

[0012] A first reflective groove is formed by etching on the surface of the array substrate; wherein the orthographic projection of the first reflective groove on the surface of the array substrate is adjacent to the orthographic projection of the LED and / or the electrode on the surface of the array substrate.

[0013] In a third aspect, an embodiment of the present invention further provides a display device, comprising any display panel provided by the embodiments of the present invention.

[0014] In an embodiment of the present invention, firstly, electrodes are arranged on an array substrate, wherein the electrodes include a first electrode; then, an LED is arranged on the array substrate and electrically connected to the first electrode, and the orthographic projection of the LED on the array substrate overlaps at least partially with the first electrode; finally, a first reflective groove is formed on the array substrate, and the orthographic projection of the first reflective groove on the surface of the array substrate is adjacent to the orthographic projection of the LED and / or the electrode on the surface of the array substrate, thereby realizing the preparation of the display panel. The preparation process of the display panel does not need to consider the alignment accuracy when the LED is transferred to the array substrate too much, which solves the problem of excessively high alignment accuracy requirements in the LED transfer process of the existing display panel, and can avoid generating too many invalid LEDs due to insufficient alignment accuracy during the transfer process. At the same time, the embodiment of the present invention can also use the first reflective groove to reflect part of the light emitted by the LED and emit it from the front of the display panel, thereby improving the utilization rate of the LED light and ensuring the light-emitting viewing angle and light-emitting efficiency of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of a partial structure of a display panel provided by an embodiment of the present invention;

[0016] Figure 2 yes Figure 1 The cross-sectional view of the display panel along AA' is shown;

[0017] Figure 3 yes Figure 1 The cross-sectional view of the display panel along BB' is shown;

[0018] Figure 4 is a flow chart of a method for preparing a display panel provided by an embodiment of the present invention;

[0019] Figure 5 yes Figure 4 The structural flow chart of the preparation method shown;

[0020] Figure 6 is a cross-sectional structural diagram of another display panel provided by an embodiment of the present invention;

[0021] Figure 7 is a cross-sectional structural diagram of another display panel provided by an embodiment of the present invention;

[0022] Figure 8is a schematic diagram of the shapes of two first reflection grooves provided in an embodiment of the present invention;

[0023] Fig. 9 This is a schematic diagram of an LED structure provided by an embodiment of the present invention;

[0024] Fig.10 is a structural schematic diagram of another display panel provided by an embodiment of the present invention;

[0025] Fig.11 is a structural schematic diagram of another display panel provided by an embodiment of the present invention;

[0026] Fig.12 is a structural schematic diagram of another display panel provided by an embodiment of the present invention;

[0027] Fig.13 is a structural schematic diagram of another display panel provided by an embodiment of the present invention;

[0028] Fig.14 yes Fig.13 The cross-sectional view of the display panel along CC' is shown;

[0029] Fig.15 yes Fig.13 A cross-sectional view of the display panel along DD' is shown;

[0030] Fig.16 is a schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0031] Fig.17 yes Fig.16 The cross-sectional view of the display panel along EE' is shown;

[0032] Fig.18 yes Figure 1 A cross-sectional view of the display panel along FF' is shown;

[0033] Fig.19 is a cross-sectional view of another display panel provided by an embodiment of the present invention;

[0034] Fig. 20 It is a structural schematic diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0036] Figure 1is a partial structural diagram of a display panel provided by an embodiment of the present invention, Figure 2 yes Figure 1 The cross-sectional view of the display panel along AA' is shown; Figure 3 yes Figure 1 The cross-sectional view of the display panel along BB' is shown in FIG. Figure 1-Figure 3 The display panel includes: an array substrate 10, the array substrate 10 includes an electrode 11 and a first reflection groove 121; an LED 20, which is located on one side of the array substrate 10, and the electrode 11 includes a first electrode 111, and the first electrode 111 is electrically connected to the LED 20; the orthographic projection of the LED 20 on the array substrate 10 at least partially overlaps with the first electrode 111; the orthographic projection of the first reflection groove 121 on the surface of the array substrate 10 is adjacent to the orthographic projection of the LED 20 and / or the electrode 11 on the surface of the array substrate 10.

[0037] Among them, the array substrate 10 is a display substrate provided with a driving circuit array. Exemplarily, the array substrate 10 in the figure includes a substrate 13, an electrode pattern layer 110, and a driving circuit layer 14 located between the substrate 13 and the electrode pattern layer 110. The driving circuit layer 14 includes a polyimide (PI) glue layer 140, a buffer layer 141, a gate layer 142, a gate insulation layer 143, an active layer 144, an interlayer insulation layer 145, a source and drain electrode layer 146, a passivation layer 147, a light shielding layer 148, and a planarization layer 149 from bottom to top. Among them, the gate layer 142, the active layer 144, and the source and drain electrode layer 146 constitute the necessary thin film transistors in the driving circuit to realize the pixel driving function. The driving circuit can drive the connected LED 20 to light up, and the LED 20 on the array substrate 10 constitutes a display pixel to achieve the effect of picture display. In the embodiment of the present invention, the electrode 11 in the array substrate 10 includes a driving electrode, i.e., a first electrode 111, which is electrically connected to the LED 20 in the driving circuit. The first electrode 111 sends a corresponding driving signal to the LED 20 to control the lighting of the LED 20. The first reflection groove 121 is a groove structure formed on the surface of the array substrate 10, and its main function is to reflect the light emitted from the LED 20 in the lateral downward direction to the surface of the array substrate 10, so that the light emitted from the LED 20 is concentrated in the vertical upward direction away from the array substrate 10. From the macroscopic perspective of the display panel, the first reflection groove 121 is mainly responsible for making part of the light emitted by the LED 20 emit in the forward direction, improving the light extraction efficiency of the LED 20 and improving the brightness of the display panel.

[0038] Generally, LED display panels are usually formed by first forming a reflective groove on the display substrate, and then transferring the LED to the display substrate. In this process, the display substrate formed with the reflective groove will restrict the placement of the LED, so that the LED has certain alignment accuracy requirements. When the relative position of the LED and the reflective groove is unstable, it will affect the LED's light-emitting viewing angle and light-emitting efficiency.

[0039] It should be emphasized that the first reflection groove 121 in the embodiment of the present invention is adjacent to the LED 20 and the electrode 11, that is, the orthographic projection of the first reflection groove 121 on the surface of the array substrate 10 is adjacent to the orthographic projection of the LED 20 and / or the electrode 11 on the surface of the array substrate 10. Adjacent here means the concept of sharing part of the boundary of the projection. In other words, the first reflection groove 121 has a part of the boundary, which is shared with the boundary of the orthographic projection of the LED 20 or the electrode 11 on the array substrate 10, and the first reflection groove 121 is adjacent to the LED 20 or the electrode 11 on the surface of the array substrate 10. Based on the positional characteristics of the first reflection groove 121, it can be understood that, with the direction of the array substrate 10 toward the LED 20 as the top, the light emitted downward from the LED 20 side will be incident on the first reflection groove 121, so that the first reflection groove 121 can reflect this part of the light.

[0040] Correspondingly, with respect to the display panel of the present invention, an embodiment of the present invention further provides a method for manufacturing the display panel. Figure 4 is a flow chart of a method for preparing a display panel provided by an embodiment of the present invention, Figure 5 yes Figure 4 The structural flow chart of the preparation method shown in FIG. Figure 1-Figure 5 , the preparation method comprises:

[0041] S110, providing an array substrate, wherein the array substrate is provided with electrodes, and the electrodes include a first electrode.

[0042] like Figure 5 As shown in FIG. a), in this step, the array substrate 10 is pre-formed with a driving circuit and an electrode pattern layer 110, and the electrode pattern layer 110 includes an electrode 11, and further includes a first electrode 111 for connecting and driving the LED 20.

[0043] S120, disposing an LED on one side of the array substrate, and electrically connecting the LED to the first electrode, wherein the orthographic projection of the LED on the array substrate at least partially overlaps with the first electrode.

[0044] like Figure 5As shown in FIG. b), the orthographic projection of LED 20 on the array substrate 10 at least partially overlaps with the first electrode 111, which essentially means that LED 20 needs to cover the first electrode 111 on the array substrate 10 to make electrical contact with the first electrode 111 and achieve electrical connection through a conductive material such as solder.

[0045] S130, etching to form a first reflective groove on the surface of the array substrate; wherein the orthographic projection of the first reflective groove on the surface of the array substrate is adjacent to the orthographic projection of the LED and / or the electrode on the surface of the array substrate.

[0046] like Figure 5 As shown in Figure c), this step indicates that the first reflection groove 121 is formed after LED 20 is set on the array substrate 10. Obviously, for LED 20, in the process of attaching it to the array substrate 10, it only needs to meet the corresponding electrical connection with the first electrode 111, and there is no need to consider too much about the shape, fine position, etc. of LED 20 on the array substrate 10, and there is no need to consider the spacing between LED 20. It is only necessary to ensure that the LED is correctly transferred to the substrate. It can be seen that the display panel and the preparation method thereof provided in the embodiment of the present invention have greatly reduced the alignment accuracy requirements of LED 20 and the alignment difficulty in the process of transferring LED 20 to the array substrate 10. At the same time, after LED 20 is transferred to the array substrate 10, the first reflection groove 121 is set to address the light emission problem of LED 20, which can also ensure the light emission efficiency of LED 20 and improve the light emission brightness of the entire display panel.

[0047] In the embodiment of the present invention, firstly, electrodes are arranged on the array substrate, wherein the electrodes include a first electrode; then, an LED is arranged on the array substrate and electrically connected to the first electrode, and the orthographic projection of the LED on the array substrate at least partially overlaps with the first electrode; finally, a first reflection groove is formed on the array substrate, and the orthographic projection of the first reflection groove on the surface of the array substrate is adjacent to the orthographic projection of the LED and / or the electrode on the surface of the array substrate, so that there is no need to consider too much the alignment accuracy when the LED is transferred to the array substrate, and the problem of excessively high alignment accuracy requirements in the LED transfer process of the existing display panel is solved, and too many invalid LEDs can be avoided due to insufficient alignment accuracy during the transfer process. At the same time, the embodiment of the present invention can also use the first reflection groove to reflect part of the light emitted by the LED and emit it from the front of the display panel, thereby improving the utilization rate of the LED light and ensuring the light-emitting viewing angle and light-emitting efficiency of the display panel.

[0048] In the above embodiment, step S130 may optionally include S131, using the LED and / or the electrode as a mask and adopting an ashing process to etch a first reflective groove on the surface of the array substrate.

[0049] The ashing process refers to an etching process for organic materials. Compared with the etching process for inorganic materials, the main difference is that an appropriate etching material needs to be selected. In the embodiment of the present invention, the first reflection groove 121 needs to be formed on the surface of the array substrate 10. Generally speaking, the surface of the array substrate 10 is a planarization layer formed by organic materials. Therefore, the ashing process needs to be used when forming the first reflection groove 121.

[0050] Furthermore, the step S131 is essentially a process of forming the first reflective groove 121 at the position adjacent to the LED 20 and the electrode 11 by using the LED 20 and the electrode 11 as a mask after the LED 20 is transferred to the array substrate 10. It can be understood that this process does not require the precise position of the LED 20 to be detected, and the position of the LED 20 does not need to be considered. The first reflective groove 121 can be automatically formed at a position adjacent to the LED 20 to ensure effective reflection of the light emitted to the side and below by the LED 20.

[0051] In other words, in order to improve the light extraction efficiency of the LED, on the basis of setting the first reflection groove on the above array substrate, the array substrate can be designed accordingly to improve the reflection efficiency of the first reflection groove. Figure 1-Figure 3 In the embodiment of the present invention, the array substrate 10 includes a planarization layer 149, a substrate 13, and an electrode pattern layer 110 formed on a side of the planarization layer 149 away from the substrate 13, and the electrode pattern layer 110 includes an electrode 11. The optional planarization layer 149 includes at least one organic film layer 1490 doped with reflective particles 1491.

[0052] Among them, the electrode pattern layer 110 is a pattern formed by preparing the electrode 11 on the surface of the planarization layer 149. Generally speaking, this process is usually a process of forming a metal electrode layer on the surface of the planarization layer 149, and patterning the metal electrode layer to form the electrode 11 through mask etching. In this embodiment, the organic film layer 1490 in the planarization layer 149 is doped with reflective particles 1491, so the reflective ability of the planarization layer 149 can be significantly improved. On the basis of the first reflective groove 121, the light emitted by the LED 20 in the side and downward direction can be effectively reflected to be emitted vertically upward, that is, forwardly, to improve the light extraction efficiency of the LED 20.

[0053] Figure 6 is a cross-sectional structural diagram of another display panel provided by an embodiment of the present invention, referring to Figure 6In another embodiment of the present invention, the optional planarization layer 149 includes at least two organic film layers 1490 stacked in sequence in a direction perpendicular to the substrate 13, and the two adjacent organic film layers 1490 include a first organic film layer 1492 and a second organic film layer 1493 located on the side of the first organic film layer 1492 away from the electrode pattern layer 110, and the refractive index of the second organic film layer 1493 is greater than the refractive index of the first organic film layer 1492.

[0054] In this embodiment, the planarization layer 149 includes at least two organic film layers 1490, which is essentially to increase reflection by using the interface between adjacent organic film layers 1490. Specifically, taking the incident light perpendicular to the interface as an example, 2, where n1 and n2 are the refractive indices of the two organic film layers. It can be seen that when there is a refractive index difference between two adjacent organic film layers 1490, the interface between the adjacent organic film layers 1490 will generate reflection, and the greater the refractive index difference, the greater the reflectivity. Figure 6 In the illustrated embodiment, at least two organic film layers 1490 are provided, and in the two adjacent organic film layers 1490, the organic film layer 1491 located at the upper layer is the first organic film layer 1492, and the organic film layer 1490 located at the lower layer is the second organic film layer 1493, and the refractive index of the second organic film layer 1493 is greater than the refractive index of the first organic film layer 1492. In essence, the refractive index of the organic film layer located at the lower layer is set to be greater than the refractive index of the organic film layer located at the upper layer. At this time, for the solution in which the planarization layer includes multiple organic film layers, the refractive index of the organic film layers increases from top to bottom, and the multiple interfaces formed will reflect the incident light from the upper layer multiple times, thereby improving the reflectivity of the planarization layer.

[0055] It should be noted that, for the above-mentioned planarization layer materials doped with reflective particles, or the stacked planarization layer materials with a refractive index difference, those skilled in the art can independently dope suitable reflective particles according to the existing planarization layer materials and select and prepare organic film layers with suitable refractive index and thickness. Of course, they can also be replaced with other planarization layer materials with high reflectivity, such as organic materials that achieve total reflection and improve reflectivity based on the refractive index design, etc., which is not limited here.

[0056] Figure 7 is a cross-sectional structural diagram of another display panel provided by an embodiment of the present invention, referring to Figure 2 and Figure 7 In some embodiments of the present invention, the spacing D between at least some adjacent two LEDs 20 is not equal, and the larger the spacing D between two adjacent LEDs 20, the larger the opening size and / or depth of the first reflective groove 121 located between the two LEDs 20.

[0057] The opening size of the first reflecting groove 121 mainly represents the side length or diameter of the first reflecting groove 121. If the opening of the first reflecting groove 121 is a rectangle, the opening size includes the length and width of the rectangle; if the opening of the first reflecting groove 121 is a circle, the opening size includes the diameter of the circle. Figure 2 and Figure 7 As shown, the spacing D between the LEDs 20 represents the distance between the two LEDs 20 in the first direction 1 parallel to the surface of the array substrate 10. Figure 2 and Figure 7 The opening size of the first reflective groove 121 also represents the size of its opening in the first direction 1 parallel to the surface of the array substrate 10. Figure 2 The opening sizes L1 and L2 of the two first reflection grooves are shown in FIG. The depth of the first reflection groove 121 represents its size in the second direction 2 perpendicular to the surface of the array substrate 10. Figure 7 The depths H2 and H3 of the two first reflection grooves are shown in the figure. It can be understood that in the display panel of the embodiment of the present invention, since the positioning accuracy of the LEDs is not required to be high, the spacing between the LEDs may be different, and the LEDs may even be randomly arranged on the basis of being electrically connected to the first electrode. Therefore, the gap area between the LED20 and the electrode 11 at different positions may be different. In the embodiment of the present invention, since the multiple first reflection grooves 121 on the array substrate 10 are formed synchronously by etching, the etching conditions such as the etching time and etching parameters are the same. Under the same conditions, the gap area between the LED20 and the electrode 11 is different, and the shape and size of the corresponding first reflection groove 121 are different. Specifically, the larger the spacing D between the LEDs 20, such as Figure 2 and Figure 7 As shown, D1>D2, the opening corresponding to D1 will be etched more fully during etching, and the overall size of the formed first reflection groove 121 will be relatively larger. The opening corresponding to D1 will be larger in opening size and depth, and the opening width L1>L2, and the depth H2>H3.

[0058] Figure 8 is a schematic diagram of the shapes of two first reflection grooves provided in an embodiment of the present invention, with reference to Figure 8In the embodiment of the present invention, the shape of the first reflection groove 121 can be a half-cut cylindrical shape or an inverted prism shape with convex side walls. The opening size and / or depth of the first reflection groove 121 of the half-cut cylindrical shape are smaller than the opening size and / or depth of the first reflection groove 121 of the inverted prism shape with convex side walls. Among them, the first reflection groove 121 of the inverted prism shape with convex side walls is mainly formed by the larger gap between the LEDs, and its etching process is more sufficient, and a plane will be formed at the bottom of the reflection groove. The first reflection groove 121 of the half-cut cylindrical shape is formed by the smaller gap between the LEDs, and the etching process is relatively insufficient. The entire side wall and the bottom are in the state of the etching process, and the inner wall is in an arc shape as a whole.

[0059] It should be noted that the shapes of the above-mentioned first reflection groove are only two possible cases, and the shapes formed under different etching conditions may be different. For example, the first reflection groove may also be hemispherical, inverted pyramidal, etc., which is not limited here.

[0060] As in the above embodiments, the LED can specifically be a mini-LED, micro-LED, nano-LED, and combinations thereof, etc. Among them, the mini-LED is smaller than the traditional LED, and its size is within the range of 0.008 inches (200 microns), which is about 1 / 5 of the size of the traditional LED. The size of the micro-LED is as small as 50μm, with a diameter of about 0.002 inches, which is about 1 / 100 of the size of the traditional LED. The nano-LED refers to an LED with a single size of less than 1 micron. Taking nano-LED as an example, when transferring to the array substrate, nano-LED generally adopts mass transfer technology. The alignment accuracy of nano-LED is insufficient, and there is a problem of uncertain position. For micro-LED and mini-LED, when transferring the LED to the array substrate, a robot can be used to attach the LED to the corresponding position of the array substrate one by one or in batches. This process can also appropriately reduce the alignment accuracy requirements of the LED and improve the LED transfer efficiency. Obviously, the solution of forming the first reflective groove after transferring the LED in the embodiment of the present invention can effectively continue to use technologies such as mass transfer to avoid precise alignment of the LED, and at the same time can effectively improve the reflection efficiency of the LED and ensure the light output efficiency.

[0061] Considering that the first reflective groove is formed after the LED is transferred, the LED can be effectively protected before the first reflective groove is formed to prevent the LED from being etched and damaged during the etching of the first reflective groove. Specifically, an anti-etching protective layer can be optionally covered on at least one side of the LED away from the array substrate.

[0062] Among them, the anti-etching protection layer does not chemically react with the etching material used when etching the first reflective groove, so it has the function of protecting the LED. The anti-etching protection layer needs to be selected corresponding to the etching material, and the specific material is not limited here. The anti-etching protection layer is covered on the surface of the LED away from the array substrate. It is necessary to form an anti-etching protection layer on the front of the LED before the LED is transferred to the array substrate. Of course, the anti-etching protection layer can also be directly wrapped on the entire surface of the LED. At this time, after the LED covered or wrapped with the anti-etching protection layer is transferred to the array substrate through mass transfer technology, the LED can be used as a mask to etch the first reflective groove on the surface of the array substrate to prevent the LED from being damaged by etching.

[0063] The present invention provides a specific implementation method for arranging or setting the LEDs on the array substrate. Figure 1 and Figure 3 As shown, in one embodiment of the present invention, the optional first electrode 111 includes a common electrode 1111 and an independent electrode 1112 that are insulated from each other; the two poles of LED 20 are respectively located at two ends in a direction parallel to the array substrate 10; the two poles of LED 20 are respectively electrically connected to the common electrode 1111 and the independent electrode 1112.

[0064] In this embodiment, the two poles of LED 20 are arranged on the same side, and LED 20 is substantially lying on the surface of array substrate 10, and the two poles are electrically connected to a common electrode 1111 and an independent electrode 1112 on array substrate 10 respectively. It should be noted that when the LED 20 is a nano-LED, the common electrode 1111 and the independent electrode 1112 on the array substrate 10 are generally designed in pairs, that is, one common electrode 1111 corresponds to one independent electrode 1112 and is arranged in parallel on the surface of array substrate 10, and at least one LED 20 is electrically connected to the common electrode 1111 and the independent electrode 1112 across the gap between the common electrode 1111 and the independent electrode 1112, and the at least one LED 20 is controlled by the common electrode 1111 and the independent electrode 1112 accordingly. It can be understood that when the common electrode 1111 and the independent electrode 1112 are connected to at least one LED 20 of a certain color, a sub-pixel can be formed, and a pixel unit can be formed with sub-pixels of other colors for screen display.

[0065] It should be noted that the above-mentioned common electrode 1111 and independent electrode 1112 are designed in pairs, which means that the positions of the two electrodes are set correspondingly and adjacently to ensure that LED20 is electrically connected to the two electrodes respectively. Since the driving signals provided by the common electrodes 1111 on the array substrate are the same, at least part of the common electrodes 1111 on the array substrate can be connected through connecting wires or electrodes to synchronously provide the same driving signal. The independent electrodes 1112 need to provide different driving signals corresponding to different sub-pixels, so each independent electrode 1112 needs to be set independently, that is, it is not connected to other electrodes on the array substrate.

[0066] Fig. 9 is a schematic diagram of an LED structure provided by an embodiment of the present invention, referring to Fig. 9 Furthermore, in the embodiment of the present invention, the LED 20 can be designed to be a rod-shaped structure, and the LED 20 emits light in the radial direction of the rod-shaped structure. The rod-shaped LED 20 emits light in the radial direction, which means that the light emission direction of the LED 20 is not restricted too much by itself. It can be imagined that when the LED 20 is transferred horizontally to the surface of the array substrate 10, part of the light will be emitted directly upward in the radial direction, and part of the light will be emitted downward in the radial direction. At this time, the first reflection groove provided in the embodiment of the present invention can reflect this part of the light emitted downward upward, thereby improving the light emission utilization rate of the LED 20 and ensuring the display brightness of the display panel.

[0067] Optionally, the shape and arrangement of the first electrodes on the array substrate are deformed, whereby the arrangement of the LEDs on the array substrate is also deformed synchronously. Fig.10 is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention, referring to Fig.10 , the first electrode 111 may include a common electrode 1111 and an independent electrode 1112 which are insulated from each other. The difference from the above embodiment is that in this embodiment, the gap between the common electrode 1111 and the independent electrode 1112 is annular. Fig.10 As shown, the independent electrode 1112 is circular, and the common electrode 1111 surrounds the circular independent electrode 1112. At this time, the multiple LEDs 20 electrically connected thereto need to be arranged along the circumference between the two electrodes. Based on this, the common electrode 1111 and the independent electrode 1112 and multiple LEDs 20 of the same color can form a sub-pixel, which can be combined with sub-pixels of other colors to form a pixel unit for image display.

[0068] From above Figure 1 and Fig.10 In the display panel shown, the pixel unit includes red, green and blue sub-pixels arranged in sequence along the row direction, which is only one embodiment of the present invention, and the corresponding sub-pixel arrangement in the display panel is RGB sequential arrangement. In other embodiments of the present invention, the arrangement can be optionally modified. Fig.11 is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention, referring to Fig.11 , exemplarily, the same pixel unit includes a red sub-pixel, a blue sub-pixel and two green sub-pixels, and the two green sub-pixels are arranged along the row direction and are located between the red sub-pixel and the blue sub-pixel in the column direction.

[0069] Fig.12 is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention, referring to Fig.12 In this embodiment, the first electrode 111 on the array substrate 10 may also include a common electrode 1111 or an independent electrode 1112 insulated from each other; the two poles of the LED 20 are respectively located at the two ends in a direction perpendicular to the array substrate 10; one of the poles of the LED 20 is electrically connected to the common electrode 1111 or the independent electrode 1112 on the array substrate 10.

[0070] With Figure 1 The difference of the embodiment shown is that in this embodiment, only one of the common electrode 1111 and the independent electrode 1112 is provided on the array substrate 10. Accordingly, the LED 20 is provided on the array substrate 10 in an upright manner, one end of which is electrically connected to the electrode provided on the array substrate 10, and the other end needs to be provided on another substrate and is electrically connected to another electrode provided on the other substrate. Exemplarily, the independent electrode 1112 can be provided on the array substrate 10, and the common electrode 1111 can be provided on the other substrate, and the two ends of the rod-shaped and upright LED 20 are respectively connected to the independent electrode 1112 and the common electrode 1111.

[0071] In the embodiment of the present invention, based on the design of the first reflective groove, another solution is provided for the problem of low luminous efficiency of the pixel unit. Fig.13 is a structural schematic diagram of another display panel provided by an embodiment of the present invention, Fig.14 yes Fig.13 The cross-sectional view of the display panel along CC' is shown. Fig.15 yes Fig.13 The cross-sectional view of the display panel along DD' is shown in FIG. Figure 13-Figure 15 Based on the above embodiment, the array substrate includes a plurality of pixel unit areas 100, the first electrode 111 is located in the pixel unit area 100, and one pixel unit area 100 includes at least one LED 20. The electrode 11 also includes a pixel partition electrode 112, and the pixel partition electrode 112 is located between at least partially adjacent two pixel unit areas 100; at least part of the first reflection groove 121 is located between the adjacent partition electrode 112 and the first electrode 111 in the pixel unit area 110, and / or, at least part of the first reflection groove 121 is located between two adjacent pixel partition electrodes 112.

[0072] The pixel units in the pixel unit area 100 represent the display units of multiple rows and columns repeatedly arranged in the display panel, which include LEDs 20 of at least two colors. The pixel unit area 100 represents the area where the display unit is located. The embodiment is essentially a scheme of setting a pixel partition electrode 112 between adjacent pixel unit areas 100. The pixel partition electrode 112 mainly functions to partition the gap between two adjacent pixel unit areas 100, so that multiple sub-gaps are formed between two adjacent pixel unit areas 100. On the one hand, the area of ​​the original gap can be reduced, and the area of ​​the first reflection groove formed by the original gap can be correspondingly reduced. On the other hand, the number of gaps can be increased, thereby forming multiple first reflection grooves. It can be understood that the first reflection grooves with relatively small areas and large numbers can make the light emitted from the LED in the pixel unit area to the side and bottom reflect more upward, provide a better reflection effect for the light output of the pixel unit area, and improve the light output efficiency of the pixel unit area.

[0073] Considering the problem of uneven luminous efficiency of different sub-pixels, the embodiment of the present invention also provides a corresponding solution. Fig.16 is a schematic structural diagram of a display panel provided by an embodiment of the present invention, Fig.17 yes Fig.16 The cross-sectional view of the display panel along EE' is shown in FIG. Fig.16 and Fig.17 In the display panel, the array substrate includes a plurality of pixel unit areas 100, the pixel unit area 100 includes at least two sub-pixel areas 101, the first electrode 111 is located in the sub-pixel area 101, the sub-pixel area 101 includes at least one LED 20, and the LED 20 is electrically connected to the first electrode 111. The electrode 11 also includes a sub-pixel partitioning electrode 113, and the sub-pixel partitioning electrode 113 at least partially surrounds at least one sub-pixel area 101. At least part of the first reflection groove 121 is located between adjacent sub-partitioning electrodes 113 and the first electrode 111 in the sub-pixel area 101, and / or, at least part of the first reflection groove 121 is located between two adjacent sub-pixel partitioning electrodes 113.

[0074] Wherein, the pixel unit is composed of sub-pixels of at least two colors, and the same sub-pixel includes at least one LED 20 of a specific color. The sub-pixel area 101 indicates the area where the sub-pixel is located. The sub-pixel partitioning electrode 113 at least partially surrounds at least one sub-pixel area 101, indicating that the adjacent area of ​​the specific sub-pixel area 101 will be provided with a sub-pixel partitioning electrode 113 to partition the gap with other sub-pixel areas 101 to form a plurality of sub-gaps. For example, a sub-pixel partitioning electrode 113 is provided on a part of the boundary area between a sub-pixel area 101 of a specific color and an adjacent sub-pixel area 101. Further, taking the sub-pixel area 101 as a rectangle as an example, the sub-pixel partitioning electrode 113 can be provided in the adjacent area of ​​at least one side of the rectangular sub-pixel area 101. Similarly, it can be known that the sub-pixel partitioning electrode 113 is provided in this embodiment for the purpose of partitioning the gap between two adjacent sub-pixel areas 101 to form a plurality of sub-gaps, thereby forming a plurality of first reflection grooves 121 between the sub-pixel areas 101. At this time, the light emitted by the LED 20 in the sub-pixel area 101 to the side and below can be reflected upward by the first reflection groove 121, providing better reflection efficiency for the light output of the sub-pixel area 101, and improving the light output efficiency of the sub-pixel area 101. It should be noted that in this embodiment, the sub-pixel isolation electrode can be optionally set only for sub-pixels of a specific color, thereby improving the luminous efficiency of the sub-pixels of the specific color and balancing the light output of each sub-pixel.

[0075] Considering that the light extraction efficiency of red LED is lower than that of green LED and blue LED, a pixel unit area including three sub-pixel areas is set on the array substrate, and the three sub-pixel areas correspond to the red LED, green LED and blue LED, respectively. The driving process needs to provide corresponding driving schemes for different light extraction efficiencies of different colors, making the driving process more complicated. Therefore, optionally, in the embodiment of the present invention, the optional pixel unit area 100 includes a first sub-pixel area 1011, the first sub-pixel area 1011 includes a red LED 21, and the sub-pixel partition electrode 113 at least partially surrounds the first sub-pixel area 1011. At this time, for the red LED 21 with low light extraction efficiency, the problem of low light extraction efficiency of the red LED 21 itself can be compensated by setting the sub-pixel partition electrode 113, and the light extraction efficiency of sub-pixels of different colors in the pixel unit can be balanced, which also helps to reduce driving differences and reduce driving difficulty. In addition, it is also possible to optionally set a sub-pixel partition electrode for each sub-pixel area in the pixel unit area, that is, the sub-pixel partition electrode at least partially surrounds each sub-pixel area, and for a sub-pixel area including a certain color LED, a larger number of sub-pixel partition electrodes can be optionally set. Here, a larger number of sub-pixel partition electrodes means that the length of the sub-pixel partition electrode surrounding the sub-pixel area is longer or the number of circles of the sub-pixel partition electrode surrounding the sub-pixel area is larger. Continuing to take the first sub-pixel area including the red light LED as an example, the first sub-pixel area can be set with more sub-pixel partition electrodes at the edge compared to the sub-pixel areas including other colors such as green light LED and blue light LED, thereby relatively increasing the number of first reflection grooves around the red light LED to compensate for the low light output efficiency of the red light LED itself.

[0076] Furthermore, in order to improve the overall light extraction efficiency of the display panel, the embodiment of the present invention also provides other optional solutions. Fig.18 yes Figure 1 The cross-sectional view of the display panel along FF' is shown in FIG. Figure 1 and Fig.18 Based on the above embodiment, a second reflective groove 122 may be optionally provided on the electrode 11, and the depth of the second reflective groove 122 is less than the thickness of the electrode 11; the orthographic projection of the second reflective groove 122 on the electrode 11 is adjacent to the orthographic projection of the LED 20 electrically connected to the electrode on the electrode 11.

[0077] For this embodiment, the embodiment of the present invention also provides a corresponding preparation method. Specifically, based on the preparation method provided in the above embodiment, it can optionally further include S140, using the LED as a mask, and using an etching process to form a second reflection groove on the electrode, the depth of the second reflection groove is less than the thickness of the electrode; the orthographic projection of the second reflection groove on the electrode is adjacent to the orthographic projection of the LED electrically connected to the electrode on the electrode.

[0078] Therefore, the difference between the second reflective groove 122 and the first reflective groove 121 is that the second reflective groove 122 is a reflective groove formed on the electrode 11, and its function is the same as that of the first reflective groove 121, which is used to reflect the light emitted from the LED 20 to the side and below upward, thereby ensuring the reflection of the light from the different side and below directions of the LED 20, and further improving the light extraction efficiency of the LED. It can be understood that the second reflective groove 122 formed by using the LED as a mask also shares part of the boundary with the LED 20 in terms of position, that is, it is in a state of being adjacent to the orthographic projection.

[0079] Fig.19 is a cross-sectional view of another display panel provided by an embodiment of the present invention, referring to Fig.19 Furthermore, the array substrate 10 may optionally further include a retaining wall structure 15, the array substrate 10 includes a plurality of pixel unit areas 100; the vertical projection of the retaining wall structure 15 on the surface of the array substrate 10 surrounds at least a portion of the pixel unit area 100; the retaining wall structure 15 includes a reflective side wall 151, and the reflective side wall 151 is inclined in a direction away from the surrounded pixel unit area 100.

[0080] The retaining wall structure 15 is essentially a retaining wall structure with a thickness that gradually decreases from bottom to top. The reflective side wall 151 is inclined away from the surrounding pixel unit area 100, indicating that it is inclined away from the surrounding LED 20. At this time, the light-emitting side wall 151 can reflect the light emitted laterally from the surrounded LED 20 upward. By using the retaining wall structure 15 and the reflective groove on the array substrate 10, the light emitted by the LED 20 can be fully utilized to improve the light emission efficiency. In addition, the retaining wall structure 15 can block the light emitted by the LED 20 from entering the adjacent pixel unit area 100, thereby avoiding crosstalk between adjacent pixel units.

[0081] Based on the same inventive concept, an embodiment of the present invention further provides a display device. Fig. 20 is a schematic diagram of a display device provided by an embodiment of the present invention, with reference to Fig. 20 , the display device includes any one of the display panels 200 provided in the above embodiments. Therefore, the display device provided in the embodiment of the present invention has the corresponding beneficial effects of the display panel provided in the embodiment of the present invention, which will not be described in detail here. Exemplarily, the display device can be an electronic device such as a mobile phone, a computer, a smart wearable device (for example, a smart watch), and a vehicle-mounted display device, which is not limited in the embodiment of the present invention.

[0082] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that: include: An array substrate, the array substrate comprising electrodes and a first reflective groove; An LED is located at one side of the array substrate, and the electrode includes a first electrode, and the first electrode is electrically connected to the LED; The orthographic projection of the LED on the array substrate at least partially overlaps with the first electrode; The orthographic projection of the first reflecting groove on the surface of the array substrate is adjacent to the orthographic projection of the LED on the surface of the array substrate, and the width of the first reflecting groove between two adjacent LEDs is equal to the spacing between the two corresponding LEDs; The first reflection groove is located at a side of the LED close to the array substrate, perpendicular to the direction of the array substrate.

2. The display panel according to claim 1, characterized in that: The array substrate comprises a plurality of pixel unit areas, the first electrode is located in the pixel unit area, and one of the pixel unit areas comprises at least one LED; The electrode also includes a pixel partition electrode, which is located between at least partially adjacent two pixel unit areas; at least part of the first reflection groove is located between the adjacent partition electrode and the first electrode in the pixel unit area, and / or at least part of the first reflection groove is located between two adjacent pixel partition electrodes.

3. The display panel according to claim 1, characterized in that: The array substrate includes a plurality of pixel unit areas, each pixel unit area includes at least two sub-pixel areas, the first electrode is located in the sub-pixel area, the sub-pixel area includes at least one LED, and the LED is electrically connected to the first electrode; The electrode further includes a sub-pixel partitioning electrode, and the sub-pixel partitioning electrode at least partially surrounds at least one of the sub-pixel regions.

4. The display panel according to claim 3, characterized in that: The pixel unit region includes a first sub-pixel region, the first sub-pixel region includes a red LED, and the sub-pixel partition electrode at least partially surrounds the first sub-pixel region.

5. The display panel according to claim 1, characterized in that: The spacing between at least some of the two adjacent LEDs is not equal, and the larger the spacing between the two adjacent LEDs, the larger the opening size and / or depth of the first reflecting groove located between the two LEDs.

6. The display panel according to claim 5, characterized in that: The shape of the first reflection groove is a half-cut cylindrical shape or an inverted prism shape with convex side walls. The opening size and / or depth of the first reflection groove in the shape of a half-cut cylindrical shape are smaller than the opening size and / or depth of the first reflection groove in the shape of an inverted prism shape with convex side walls.

7. The display panel according to claim 1, characterized in that: The array substrate includes a plurality of pixel unit areas; the array substrate also includes a retaining wall structure, the vertical projection of the retaining wall structure on the surface of the array substrate surrounds at least part of the pixel unit area; the retaining wall structure includes a reflective side wall, and the reflective side wall is inclined in a direction away from the surrounded pixel unit area.

8. The display panel according to claim 1, characterized in that: The array substrate comprises a planarization layer, a substrate, and an electrode pattern layer formed on a side of the planarization layer away from the substrate, wherein the electrode pattern layer comprises the electrode; The planarization layer includes at least one organic film layer doped with reflective particles; or, the planarization layer includes at least two organic film layers stacked in sequence in a direction perpendicular to the substrate, and the two adjacent organic film layers include a first organic film layer and a second organic film layer located on the side of the first organic film layer away from the electrode pattern layer, and the refractive index of the second organic film layer is greater than the refractive index of the first organic film layer.

9. The display panel according to claim 1, characterized in that: The first electrodes include common electrodes and / or independent electrodes insulated from each other; The two poles of the LED are respectively located at two ends in a direction parallel to the array substrate; the two poles of the LED are respectively electrically connected to the common electrode and the independent electrode; Alternatively, the two poles of the LED are respectively located at two ends in a direction perpendicular to the array substrate; and one of the poles of the LED is electrically connected to the common electrode or the independent electrode on the array substrate.

10. The display panel according to claim 1, characterized in that: The LED is in a rod-shaped structure, and emits light along the radial direction of the rod-shaped structure.

11. The display panel according to claim 1, characterized in that: The LED includes at least one of a mini-LED, a micro-LED and a nano-LED.

12. A display panel, characterized in that: include: An array substrate, the array substrate comprising electrodes and a first reflective groove; An LED is located at one side of the array substrate, and the electrode includes a first electrode, and the first electrode is electrically connected to the LED; The orthographic projection of the LED on the array substrate at least partially overlaps with the first electrode; The orthographic projection of the first reflecting groove on the surface of the array substrate is adjacent to the orthographic projection of the LED on the surface of the array substrate, and the width of the first reflecting groove between two adjacent LEDs is equal to the spacing between the two corresponding LEDs; The first reflective groove is located on a side of the LED close to the array substrate, perpendicular to the direction of the array substrate; and / or, the orthographic projection of the first reflecting groove on the surface of the array substrate is adjacent to the orthographic projection of the electrode on the surface of the array substrate, and the width of the first reflecting groove between two adjacent electrodes is equal to the spacing between the corresponding two electrodes; The first reflective groove is located on a side of the electrode close to the array substrate in a direction perpendicular to the array substrate; The electrode is provided with a second reflection groove, the depth of which is less than the thickness of the electrode; the orthographic projection of the second reflection groove on the electrode is adjacent to the orthographic projection of the LED electrically connected to the electrode on the electrode.

13. A display panel, characterized in that: include: An array substrate, the array substrate comprising electrodes and a first reflective groove; An LED is located at one side of the array substrate, and the electrode includes a first electrode, and the first electrode is electrically connected to the LED; The orthographic projection of the LED on the array substrate at least partially overlaps with the first electrode; The orthographic projection of the first reflecting groove on the surface of the array substrate is adjacent to the orthographic projection of the LED on the surface of the array substrate, and the width of the first reflecting groove between two adjacent LEDs is equal to the spacing between the two corresponding LEDs; The first reflective groove is located on a side of the LED close to the array substrate, perpendicular to the direction of the array substrate; and / or, the orthographic projection of the first reflecting groove on the surface of the array substrate is adjacent to the orthographic projection of the electrode on the surface of the array substrate, and the width of the first reflecting groove between two adjacent electrodes is equal to the spacing between the corresponding two electrodes; The first reflective groove is located on a side of the electrode close to the array substrate in a direction perpendicular to the array substrate; At least one surface of the LED facing away from the array substrate is covered with an anti-etching protection layer.

14. A method for preparing a display panel, characterized in that: include: Providing an array substrate, wherein the array substrate is provided with electrodes, and the electrodes include a first electrode; An LED is arranged on one side of the array substrate, and the LED is electrically connected to the first electrode, and the orthographic projection of the LED on the array substrate at least partially overlaps with the first electrode; A first reflective groove is formed by etching on the surface of the array substrate; wherein the orthographic projection of the first reflective groove on the surface of the array substrate is adjacent to the orthographic projection of the LED and / or the electrode on the surface of the array substrate; Etching a first reflective groove on the surface of the array substrate comprises: Using the LED and / or the electrode as a mask and adopting an ashing process, etching the first reflective groove on the surface of the array substrate; The first reflection groove is located on a side of the LED close to the array substrate perpendicular to the direction of the array substrate, and / or the first reflection groove is located on a side of the electrode close to the array substrate perpendicular to the direction of the array substrate.

15. A display device, characterized in that: Comprising a display panel as described in any one of claims 1-13.

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