Display panel, preparation method thereof and display device

Abstract

The invention discloses a display panel, a preparation method thereof and a display device. The display panel comprises an array substrate, a white light emitting layer, a thin film encapsulation layer, an optical crosstalk barrier layer and a color filter layer, the light crosstalk barrier layer is located on the thin film packaging layer and away from the white light emitting layer. The optical crosstalk barrier layer comprises a microlens array and a first light transmission function layer, and the first light transmission function layer is arranged on the side, away from the thin film packaging layer, of the microlens array; the micro-lens array comprises a plurality of micro-lens structures which are arranged in an array; the color filter layer is located on one side, far away from the thin film packaging layer, of the optical crosstalk barrier layer, and the color filter layer comprises a plurality of filter units of different colors which are closely arranged; wherein the micro-lens structures and the filtering units are arranged in a one-to-one correspondence mode, and the material of the first light transmission function layer comprises a high-transmittance and high-refractive-index function material. According to the technical scheme of the embodiment of the invention, the display brightness of the silicon-based OLED micro-display can be improved, and meanwhile, the color gamut loss can be improved.

Description

Technical Field

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

[0002] Micro Organic Light-Emitting Diode (Micro OLED, also known as silicon-based OLED) is a new display technology that produces active light-emitting OLED devices on single-crystal silicon wafers. Silicon-based OLED products have the advantages of small size, light weight, ultra-high resolution and low power consumption, and the mass production technology is relatively mature, and has become the mainstream technology for near-eye display.

[0003] Silicon-based OLED technology uses a combination of white OLED devices and color filters to form a color silicon-based OLED microdisplay. However, the technology of combining white OLED devices with color filters has the following shortcomings: first, the production of large-area white OLED devices on the entire surface will cause electrical horizontal lateral crosstalk between light-emitting units and crosstalk between adjacent light-emitting sub-pixels, affecting the color gamut; second, the color filter itself and its thickness will cause light loss, which has a great impact on the display brightness. In response to the above problems, the existing technology mostly uses a method of adding a layer of microlens structure to the color filter to increase the front light output rate to increase the display brightness. However, the existing technology still cannot solve the problems of lateral electrical crosstalk and color gamut loss between light-emitting sub-pixels at the same time. Summary of the invention

[0004] The present invention provides a display panel and a method for preparing the same, and a display device, so as to solve the problem that a silicon-based OLED microdisplay cannot simultaneously increase display brightness and improve color gamut loss.

[0005] According to one aspect of the present invention, there is provided a display panel, comprising:

[0006] An array substrate;

[0007] A white light emitting layer, located on the surface of the array substrate;

[0008] A thin film encapsulation layer, located on a side of the white light emitting layer away from the array substrate;

[0009] an optical crosstalk blocking layer, located on the thin film encapsulation layer away from the white light emitting layer; the optical crosstalk blocking layer comprises a microlens array and a first light transmission functional layer, the first light transmission functional layer is arranged on a side of the microlens array away from the thin film encapsulation layer; the microlens array comprises a plurality of microlens structures arranged in an array;

[0010] A color filter layer, located on a side of the optical crosstalk blocking layer away from the thin film encapsulation layer, the color filter layer comprising a plurality of closely arranged filter units of different colors;

[0011] Wherein, each of the microlens structures is arranged in one-to-one correspondence with each of the filter units, and the material of the first light transmission functional layer includes a functional material with high transmittance and high refractive index.

[0012] Optionally, the white light emitting layer includes an anode layer, a pixel definition layer, an organic light emitting layer and a cathode layer;

[0013] The pixel definition layer is arranged on a side of the anode layer away from the array substrate, the organic light emitting layer is arranged on a side of the anode layer and the pixel definition layer away from the array substrate, and the cathode layer is arranged on a side of the organic light emitting layer away from the pixel definition layer;

[0014] Wherein, the pixel definition layer comprises a plurality of pixel spacing parts arranged at intervals, and a pixel definition area is formed between two adjacent pixel spacing parts; the pixel spacing parts are in an inverted trapezoidal shape;

[0015] The anode layer includes a plurality of anodes, each of which is disposed in each of the pixel definition areas;

[0016] The filter unit has a first orthographic projection on the array substrate, the pixel definition area has a second orthographic projection on the array substrate, and the two pixel spacing parts adjacent to the pixel definition area each have a third orthographic projection on the array substrate; the first orthographic projection covers the second orthographic projection and at least part of half of the two adjacent third orthographic projections.

[0017] Optionally, the width of the microlens structure and the width of the filter unit are both smaller than or equal to the sum of the widths of the pixel definition area and one of the pixel spacing portions.

[0018] Optionally, the width of the pixel definition area is smaller than the width of the microlens structure, and the width of the microlens structure is smaller than the width of the filter unit.

[0019] Optionally, the display panel further includes a second light transmission functional layer;

[0020] The second light transmission functional layer is disposed on a side of the color filter layer away from the light crosstalk blocking layer.

[0021] Optionally, the display panel further includes a black matrix;

[0022] A groove is provided on a surface of one side of the thin film encapsulation layer away from the array substrate, and the groove is in an inverted trapezoidal shape;

[0023] The black matrix is ​​disposed in the groove.

[0024] Optionally, the lower bottom surface of the pixel spacing portion has a first width, and the upper bottom surface of the pixel spacing portion has a second width;

[0025] The width of the groove is greater than the first width, and the width of the groove is less than the second width;

[0026] The width of the groove is smaller than the width of the black matrix, and the width of the black matrix is ​​smaller than or equal to the width of the pixel spacer.

[0027] Optionally, the microlens structure is a spherical microlens, and the light-emitting surface of the microlens structure is a spherical surface convex outwards;

[0028] The thickness of the first light transmission functional layer is greater than the thickness of the microlens structure, and the thickness of the microlens structure is less than or equal to half of the width of the microlens structure.

[0029] According to another aspect of the present invention, there is provided a display device, comprising the display panel as described in any embodiment of the first aspect.

[0030] According to another aspect of the present invention, there is provided a method for preparing a display panel, comprising:

[0031] Providing an array substrate;

[0032] forming a white light emitting layer on a surface of the array substrate;

[0033] forming a thin film encapsulation layer on a side of the white light emitting layer away from the array substrate;

[0034] A light crosstalk blocking layer is formed on a side of the thin film encapsulation layer away from the white light emitting layer; the light crosstalk blocking layer comprises a microlens array and a first light transmission functional layer;

[0035] A color filter layer is formed on a side of the light crosstalk blocking layer away from the thin film encapsulation layer; the color filter layer includes a plurality of filter units of different colors that are closely arranged;

[0036] Among them, the first light transmission functional layer is arranged on a side of the microlens array away from the thin film encapsulation layer; the microlens array includes a plurality of microlens structures arranged in an array; each of the microlens structures is arranged in a one-to-one correspondence with each of the filter units, and the material of the first light transmission functional layer includes a functional material with high transmittance and high refractive index.

[0037] The display panel provided by the embodiment of the present invention has a light crosstalk blocking layer arranged on the side of the thin film encapsulation layer away from the white light emitting layer, and a color filter layer is arranged on the side of the light crosstalk blocking layer away from the thin film encapsulation layer. The light crosstalk blocking layer includes a microlens array and a first light transmission functional layer. The microlens array includes a plurality of microlens structures arranged in an array. The color filter layer includes a plurality of filter units of different colors arranged closely, and each microlens structure is arranged one by one corresponding to each filter unit. Compared with the related art that sets the microlens structure on the surface of the color filter, the embodiment of the present invention can effectively reduce the vertical distance between the microlens array and the white light emitting layer, converge more white light, and effectively utilize the large-angle light emitted by the entire white light organic light emitting layer, which is conducive to improving the display brightness of the display panel. In addition, the first light transmission functional layer adopts a functional material with high transmittance and high refractive index, does not change the deflection angle of the light emitted from the surface of the microlens structure, avoids the refractive index difference between adjacent film layers from affecting the transmission path of the white light, thereby improving the situation that the white light with a large light deflection angle is prone to lateral electrical crosstalk. The filter units in the color filter layer are closely arranged, which can also reduce the impact of crosstalk between adjacent light-emitting sub-pixels on the color gamut.

[0038] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 It is a structural schematic diagram of a display panel provided by the prior art;

[0041] Figure 2 is a schematic cross-sectional structural diagram of a display panel provided according to an embodiment of the present invention;

[0042] Figure 3 is a schematic diagram of various structural dimensions in a display panel provided according to an embodiment of the present invention;

[0043] Figure 4 is a schematic diagram of various structural dimensions in another display panel provided according to an embodiment of the present invention;

[0044] Figure 5 is a schematic cross-sectional structure diagram of another display panel provided according to an embodiment of the present invention;

[0045] Figure 6 is a schematic cross-sectional structure diagram of another display panel provided according to an embodiment of the present invention;

[0046] Figure 7 yes Figure 6 A schematic diagram of the enlarged cross-sectional structure of the dotted circle portion;

[0047] Figure 8 is a schematic diagram of a display device provided according to an embodiment of the present invention;

[0048] Fig. 9 is a schematic flow chart of a method for manufacturing a display panel according to an embodiment of the present invention;

[0049] Fig.10 yes Fig. 9 Schematic diagram of the structure corresponding to each step in . DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0051] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0052] As described in the background technology, a silicon-based OLED microdisplay is a microdisplay made on a CMOS chip, that is, anode pixels, white light OLED devices, encapsulation films and color filters are made on the backplane of the CMOS chip, and a colored silicon-based OLED microdisplay is realized by combining white light OLED devices with color filters. The technology of combining white light OLED devices with color filters also has its own shortcomings. Among them, one shortcoming is that the resolution of silicon-based OLED display screens is generally above 3000PPI, and the existing fine metal mask technology (Fine Metal Mask, FMM technology) cannot achieve true colorization. Therefore, only large-area white light OLED devices can be made on the entire surface, which will also cause electrical horizontal crosstalk between light-emitting units and the crosstalk of adjacent light-emitting sub-pixels affects the color gamut. Another shortcoming is that the color filter itself and its thickness factor will cause light loss, which has a greater impact on the display brightness. The industry currently mainly improves brightness by improving the metal anode reflective layer material (such as silver metal), improving the efficiency of OLED devices, and adding microlens structures to color filters. It also improves the effect of lateral cross-color on color gamut by pixel design, OLED device optimization, and light-emitting device microcavity structure. For example, Figure 1 Schematic diagram of the structure of a display panel provided by the prior art. Figure 1 , which shows the situation of improving the display brightness by adding a microlens structure 02 on the color filter 01. The white dotted arrow represents the white light emitted by the anode pixel. However, the existing technology solves the problems of brightness and color gamut from a single direction respectively, and the improvement effect is not good. Figure 1 It can be seen that, although the display brightness can be improved to a certain extent by setting the microlens structure 02, the white light with a large deflection angle emitted by the anode pixel is easy to be emitted from the gap between the two adjacent color filters 01 and the two adjacent microlens structures 02, causing electrical lateral crosstalk and resulting in a reduction in the color gamut.

[0053] Based on the above technical problems, the embodiments of the present invention propose the following technical solutions:

[0054] An embodiment of the present invention provides a display panel. Figure 2 FIG. 1 is a schematic diagram of a cross-sectional structure of a display panel provided by an embodiment of the present invention. Figure 2 As shown, the display panel includes: an array substrate 10 , a white light emitting layer 20 , a thin film encapsulation layer 30 , an optical crosstalk blocking layer 40 and a color filter layer 50 .

[0055] The white light emitting layer 20 is located on the surface of the array substrate 10; the thin film encapsulation layer 30 is located on the side of the white light emitting layer 20 away from the array substrate 10; the light crosstalk blocking layer 40 is located on the side of the thin film encapsulation layer 30 away from the white light emitting layer 20; the light crosstalk blocking layer 40 includes a microlens array 41 and a first light transmission functional layer 42, and the first light transmission functional layer 42 is arranged on the side of the microlens array 41 away from the thin film encapsulation layer 30; the microlens array 41 includes a plurality of microlens structures 411 arranged in an array; the color filter layer 50 is located on the side of the light crosstalk blocking layer 40 away from the thin film encapsulation layer 30, and the color filter layer 50 includes a plurality of closely arranged filter units 51 of different colors; wherein each microlens structure 411 is arranged one-to-one with each filter unit 51, and the material of the first light transmission functional layer 42 includes a functional material with high transmittance and high refractive index.

[0056] Specifically, the thin film encapsulation layer 30 encapsulates the array substrate 10 and the white light emitting layer 20 to protect the main light emitting devices of the display panel from external moisture and oxygen. An optical crosstalk blocking layer 40 is provided between the thin film encapsulation layer 30 and the color filter layer 50, and a microlens array 41 is provided in the optical crosstalk blocking layer 40. The microlens array 41 includes a plurality of microlens structures 411 arranged in an array, and the microlens structure 411 has a convergence effect on the light emitted by the white light emitting device in the white light emitting layer 20. Compared with the related art in which the microlens structure is arranged on the side of the color filter away from the substrate, in the display panel provided by the embodiment of the present invention, the microlens array 41 is arranged on the side of the thin film encapsulation layer 30 away from the array substrate 10, which can effectively reduce the vertical distance between the microlens array 41 and the white light emitting device, so that the light emitted by the white light emitting device can pass through the microlens array 41 more and then be emitted, that is, the microlens array 41 can collect and converge more white light, so that the large-angle white light emitted by the white light emitting device can be effectively utilized, which is conducive to improving the display brightness of the display panel.

[0057] The light crosstalk blocking layer 40 is also provided with a first light transmission functional layer 42, which is provided on the side of the microlens array 41 away from the thin film encapsulation layer 30, and completely covers the microlens array 41, and fills the gap between two adjacent microlens structures 411. Compared with the use of organic compounds such as transparent resin to form an organic compound layer (OC layer) on the side of the microlens structure away from the substrate in the related art, the first light transmission functional layer 42 in the embodiment of the present invention can use a functional material with high transmittance and high refractive index. The functional material with high transmittance and high refractive index will not change the deflection angle of the white light rays converged by the microlens structure 411, that is, after the white light rays are deflected by the microlens structure 411, the original light deflection angle is maintained and emitted from the surface of the microlens structure 411, so as to avoid the refractive index difference between adjacent film layers affecting the transmission path of the white light rays, which is conducive to improving the light gathering effect and display brightness, thereby improving the situation that the white light rays with a large light deflection angle are prone to lateral electrical crosstalk. The white light passes through the first light transmission functional layer 42 and then is emitted through the color filter layer 50 , thereby achieving a color display effect of the display panel.

[0058] In addition, the color filter layer 50 includes a plurality of filter units 51 of different colors. For example, the filter unit 51 may include a red filter unit 511, a green filter unit 512, and a blue filter unit 513. Figure 2 , each filter unit 51 in the color filter layer 50 can be arranged closely in sequence according to the red filter unit 511, the green filter unit 512 and the blue filter unit 513, that is, the two adjacent filter units 51 are arranged in close contact without any gap. And each filter unit 51 is provided with a microlens structure 411 in a one-to-one correspondence. Compared with the situation in the related art where two adjacent filter units 51 are arranged at intervals, most of the white light emitted by the microlens array 41 can be emitted through the corresponding filter unit 51, and some white light with a large light deflection angle will be filtered out when irradiated on other filter units 51 and will not be emitted, thereby reducing the stray light caused by cross-talk between adjacent light-emitting sub-pixels and effectively improving the situation of color gamut reduction.

[0059] The display panel provided by the embodiment of the present invention has a light crosstalk blocking layer arranged on the side of the thin film encapsulation layer away from the white light emitting layer, and a color filter layer is arranged on the side of the light crosstalk blocking layer away from the thin film encapsulation layer. The light crosstalk blocking layer includes a microlens array and a first light transmission functional layer. The microlens array includes a plurality of microlens structures arranged in an array. The color filter layer includes a plurality of filter units of different colors arranged closely, and each microlens structure is arranged one by one corresponding to each filter unit. Compared with the related art that sets the microlens structure on the surface of the color filter, the embodiment of the present invention can effectively reduce the vertical distance between the microlens array and the white light emitting layer, converge more white light, and effectively utilize the large-angle light emitted by the entire white light organic light emitting layer, which is conducive to improving the display brightness of the display panel. In addition, the first light transmission functional layer adopts a functional material with high transmittance and high refractive index, does not change the deflection angle of the light emitted from the surface of the microlens structure, avoids the refractive index difference between adjacent film layers from affecting the transmission path of the white light, thereby improving the situation that the white light with a large light deflection angle is prone to lateral electrical crosstalk. The filter units in the color filter layer are closely arranged, which can also reduce the impact of crosstalk between adjacent light-emitting sub-pixels on the color gamut.

[0060] Optionally, based on the above embodiment, continue to refer to Figure 2 The white light emitting layer 20 includes an anode layer 21 , a pixel definition layer 22 , an organic light emitting layer 23 and a cathode layer 24 .

[0061] The pixel definition layer 22 is arranged on the side of the anode layer 21 away from the array substrate 10, the organic light-emitting layer 23 is arranged on the side of the anode layer 21 and the pixel definition layer 22 away from the array substrate 10, and the cathode layer 24 is arranged on the side of the organic light-emitting layer 23 away from the pixel definition layer 22.

[0062] Among them, the pixel definition layer 22 includes a plurality of pixel spacers 221 arranged at intervals, and a pixel definition area is formed between two adjacent pixel spacers 221; the pixel spacers 221 are inverted trapezoidal; the anode layer 21 includes a plurality of anodes 211, and each anode 211 is arranged in each pixel definition area; the filter unit 51 has a first orthographic projection on the array substrate 10, the pixel definition area has a second orthographic projection on the array substrate 10, and the two pixel spacers 221 adjacent to the pixel definition area each have a third orthographic projection on the array substrate 10; the first orthographic projection covers the second orthographic projection and at least part of half of the two adjacent third orthographic projections.

[0063] Specifically, a plurality of anodes 211 in the anode layer 21 are arranged in a pixel definition area formed by two adjacent pixel spacing parts 221 in the pixel definition layer 22, and each pixel spacing part 221 separates two adjacent anodes 211, and each anode 211 corresponds to a light-emitting sub-pixel. An entire organic light-emitting layer 23 is arranged on the side of the anode layer 21 away from the array substrate 10, and an entire cathode layer 24 is arranged on the side of the organic light-emitting layer 23 away from the pixel definition layer 22. By adjusting the voltage between each anode 211 and the entire cathode layer 24, the organic light-emitting layer 23 corresponding to the corresponding anode 211 is controlled to emit light. After the light passes through the microlens structure 411, it is emitted by the corresponding filter unit 51 through the first light transmission functional layer 42, thereby realizing color display of the display panel. The first orthographic projection of each filter unit 51 on the array substrate 10 can cover at least part of the sum of the second orthographic projection and half of the two adjacent third orthographic projections, that is, the first orthographic projection can cover at most the sum of the second orthographic projection and half of the two adjacent third orthographic projections, that is, the width of the filter unit 51 is less than or equal to the sum of the width of the pixel definition area and half of the width of the two adjacent pixel spacing parts 221, so that the width dimension of each luminous sub-pixel is strictly controlled within the spacing dimension range of an anode pixel point, and the white light emitted by the anode pixel point can be effectively controlled to be emitted by the corresponding filter unit 51 to form a luminous sub-pixel of the corresponding luminous color, while avoiding the white light emitted by other adjacent filter units 51, causing the cross-light between adjacent luminous sub-pixels to affect the color gamut.

[0064] Optionally, Figure 3 Schematic diagram of various structural dimensions in a display panel provided by an embodiment of the present invention. Figure 3 , the width of the microlens structure 411 and the width of the filter unit 51 are both less than or equal to the sum of the widths of the pixel definition area and one pixel spacing portion 221 .

[0065] Specifically, the width of a pixel definition area and a pixel spacing portion 221 is equivalent to the sum of the width of a pixel definition area and half of the width of two adjacent pixel spacing portions 221, which is also the spacing size of an anode pixel. The width of the microlens structure 411 and the width of the filter unit 51 are both set to be less than or equal to the spacing size of an anode pixel, so that as much white light emitted by a light-emitting sub-pixel as possible can be gathered, which is beneficial to improving the display brightness, and is beneficial to improving the situation that white light with a large light deflection angle is prone to lateral electrical crosstalk, and can also reduce the impact of crosstalk between adjacent light-emitting sub-pixels on the color gamut.

[0066] Optionally, based on the above embodiments, continue to refer to Figure 3 , the width of the pixel definition area is smaller than the width of the microlens structure 411 , and the width of the microlens structure 411 is smaller than the width of the filter unit 51 .

[0067] Exemplarily, the width of the pixel definition area can be recorded as D1, the width of the microlens structure 411 can be recorded as D2, and the width of the filter unit 51 can be recorded as D3. Setting the width D2 of the microlens structure 411 to be greater than the width D1 of the pixel definition area is equivalent to wrapping the corresponding light-emitting sub-pixel in the microlens structure 411, so that most of the white light emitted by the light-emitting sub-pixel in the pixel definition area can be emitted through the microlens structure 411, changing the deflection angle of the white light, gathering more white light, and reducing the electrical lateral crosstalk between two adjacent light-emitting sub-pixels. And setting the width D3 of the filter unit 51 to be greater than the width D2 of the microlens structure 411, so that as much white light gathered by the microlens structure 411 as possible is emitted by the corresponding filter unit 51, realizing color display of the corresponding color, which can effectively improve the display brightness, and can improve the color gamut loss caused by lateral crosstalk.

[0068] Optionally, based on the above embodiments, the microlens structure 411 is a spherical microlens, and the light-emitting surface of the microlens structure 411 is a spherical surface convex outward;

[0069] The thickness of the first light transmission functional layer 42 is greater than the thickness of the microlens structure 411 , and the thickness of the microlens structure 411 is less than or equal to half of the width of the microlens structure 411 .

[0070] Specifically, the microlens structure 411 provided in the embodiment of the present invention adopts a spherical microlens, and the convex spherical surface of the microlens structure 411 is set on the side close to the color filter layer 50 to serve as a light-emitting surface to converge the white light. Exemplarily, the maximum thickness of the microlens structure 411 can be recorded as H1, and the maximum thickness of the first light transmission functional layer 42 can be recorded as H2. The first light transmission functional layer 42 covers the microlens array 41 and flattens the surface of the microlens array 41, that is, the maximum thickness H2 of the first light transmission functional layer 42 is greater than the maximum thickness H1 of the microlens structure 411, so that the surface of the first light transmission functional layer 42 is a flat surface, which is convenient for subsequent processes on the first light transmission functional layer 42. Figure 4 4 is a schematic diagram of the dimensions of each structure in another display panel provided by an embodiment of the present invention. The microlens structure 411 will affect the transmission path of the white light, see Figure 4 , which shows the case where the thickness H1 of the microlens structure 411 is smaller than the width D2 of the microlens structure 411; see Figure 3, which shows the case where the thickness H1 of the microlens structure 411 is equal to the width D2 of the microlens structure 411. The microlens structures 411 of the above two sizes both have a good convergence effect on white light. Preferably, the thickness H1 of the microlens structure 411 is set to be equal to the width D2 of the microlens structure 411, which has a better convergence effect on white light and can effectively improve the display brightness of the display panel.

[0071] Optionally, Figure 5 FIG. 1 is a schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention. Figure 5 As shown, the display panel further includes a second light transmission functional layer 60 .

[0072] The second light transmission functional layer 60 is disposed on a side of the color filter layer 50 away from the light crosstalk blocking layer 40 .

[0073] Specifically, a second light transmission functional layer 60 is disposed on the surface of the color filter layer 50 away from the light crosstalk blocking layer 40. For example, the second light transmission functional layer 60 can also be prepared by using a functional material with high transmittance and high refractive index, and the material used in the second light transmission functional layer 60 can be the same as the material used in the first light transmission functional layer 42. In this way, the light emitted from the color filter layer 50 will not be deflected, and the refractive index difference between adjacent film layers will be avoided to affect the optical path of light transmission, which can further improve the light convergence effect and enhance the display brightness of the display panel.

[0074] Optionally, Figure 6 FIG. 1 is a schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention. Figure 6 As shown, the display panel further includes a black matrix 70 .

[0075] A groove is disposed on a surface of the thin film encapsulation layer 30 which is away from the array substrate 10 . The groove is in an inverted trapezoidal shape. The black matrix 70 is disposed in the groove.

[0076] Specifically, grooves are provided on the surface of the thin film encapsulation layer 30 at positions corresponding to two adjacent microlens structures 411, and the grooves do not penetrate the thin film encapsulation layer 30. The cross-sectional shape of the grooves is an inverted trapezoid, and the black matrix 70 is provided in the grooves. It should be noted that the grooves provided on the surface of the thin film encapsulation layer 30 are intermediate structures in the process of preparing the black matrix 70. Figure 6 It is not convenient to express in , so Figure 6 In this way, it is possible to further prevent light with a large deflection angle from being emitted from the gap between two adjacent microlens structures 411, causing electrical lateral crosstalk and resulting in a reduction in the display color gamut of the display panel.

[0077] Optionally, Figure 7yes Figure 6 FIG. 1 is a schematic diagram of an enlarged cross-sectional structure of the dotted circle portion. Figure 6 and Figure 7 , the lower bottom surface of the pixel spacing portion 221 has a first width D4, and the upper bottom surface of the pixel spacing portion 221 has a second width D5.

[0078] The width D6 of the groove is greater than the first width D4 and less than the second width D5 ; the width D6 of the groove is less than the width D7 of the black matrix 70 , and the width D7 of the black matrix 70 is less than or equal to the width of the pixel spacer 221 .

[0079] Specifically, the width D6 of the groove is set between the second width D5 of the upper bottom surface of the pixel spacer 221 and the first width D4 of the lower bottom surface of the pixel spacer 221, and the width D7 of the black matrix 70 filled in the groove is set between the width D6 of the groove and the second width D5 of the upper bottom surface of the pixel spacer 221, that is, the thickness of the black matrix 70 is greater than the depth of the groove, and the black matrix 70 is protruded from the surface of the thin film encapsulation layer 30. In this way, the side of the black matrix 70 can be partially in contact with the microlens structure 411, so that the electrical lateral crosstalk of the light with a large deflection angle can be effectively avoided, and the problem of reduced display color gamut can be effectively improved.

[0080] An embodiment of the present invention further provides a display device. Figure 8 Schematic diagram of a display device provided by an embodiment of the present invention. Figure 8 As shown, the display device may be a mobile phone, a tablet computer, etc. The display device includes a display panel as provided in any embodiment of the present invention, and its technical principle and effects are similar and will not be described in detail.

[0081] An embodiment of the present invention further provides a method for manufacturing a display panel, and the method can be applied to the display panel provided by any embodiment of the present invention. Fig. 9 is a schematic flow chart of a method for manufacturing a display panel provided by an embodiment of the present invention, Fig.10 yes Fig. 9 The structural diagram corresponding to each step in the Fig. 9 and Fig.10 The display panel preparation method specifically includes the following steps:

[0082] S110 , providing an array substrate 10 .

[0083] The array substrate may adopt a CMOS backplane.

[0084] S120 , forming a white light emitting layer 20 on a surface of the array substrate 10 .

[0085] Specifically, the anode layer 21, the pixel definition layer 22, the organic light emitting layer 23 and the cathode layer 24 are prepared layer by layer on the CMOS backplane, thereby forming a white light emitting layer.

[0086] S130 , forming a thin film encapsulation layer 30 on a side of the white light emitting layer 20 away from the array substrate 10 .

[0087] Specifically, a thin film encapsulation layer, namely a TFE (Thin Film Encapsulation) layer, is prepared on the surface of the white light emitting layer.

[0088] S140 , forming an optical crosstalk blocking layer 40 on a side of the thin film encapsulation layer 30 away from the white light emitting layer 20 ; the optical crosstalk blocking layer 40 includes a microlens array 41 and a first light transmission functional layer 42 .

[0089] Specifically, a photolithography process or a process combining photolithography with etching and degumming is used on the surface of the TFE layer to prepare a microlens array with high dimensional accuracy, so that the size and position accuracy of the prepared microlens array are strictly controlled within the range of the size of an anode pixel point spacing. It should be noted that the production of the microlens array is not limited to one or more photolithography processes, or is not limited to one or more photolithography processes combined with etching and degumming. A first light transmission functional layer is prepared on the surface of the microlens array using a functional material with high transmittance and high refractive index to fill the height difference in the structure caused by the microlens array, which is convenient for subsequent photolithography process production; and the refractive index of the microlens structure is matched so that the light emitted by the microlens array maintains the deflection angle. It should be noted that the first light transmission functional layer can be made into a single layer or a multi-layer thin film, which is not limited here.

[0090] S150 , forming a color filter layer 50 on a side of the light crosstalk blocking layer 40 away from the thin film encapsulation layer 30 ; the color filter layer 50 includes a plurality of closely arranged filter units 51 of different colors.

[0091] Among them, the first light transmission functional layer 42 is arranged on the side of the microlens array 41 away from the thin film encapsulation layer 30; the microlens array 41 includes a plurality of microlens structures 411 arranged in an array; each microlens structure 411 is arranged one-to-one with each filter unit 51, and the material of the first light transmission functional layer 42 includes a functional material with high transmittance and high refractive index.

[0092] Specifically, a color filter layer is formed on the surface of the first light transmission functional layer, and a plurality of filter units of different colors included in the color filter layer are closely arranged, that is, there is no gap between two adjacent filter units, thereby completing the production of the light-emitting sub-pixel in the display panel. Each microlens structure in the microlens array is arranged in a one-to-one correspondence with each filter unit, so that the size and position accuracy of each light-emitting sub-pixel is strictly controlled within the range of the size of an anode pixel point spacing.

[0093] The display panel manufacturing method provided by the embodiment of the present invention sets the light crosstalk blocking layer between the thin film encapsulation layer and the color filter layer, which can effectively reduce the vertical distance between the microlens array and the white light emitting layer, converge more white light, and help improve the display brightness of the display panel. The use of high-transmittance and high-refractive index functional materials to prepare the first light transmission functional layer can avoid the refractive index difference between adjacent film layers affecting the transmission path of the white light, and improve the situation where white light with a large light deflection angle is prone to lateral electrical crosstalk. The closely arranged filter units can also reduce the impact of the crosstalk between adjacent light-emitting sub-pixels on the color gamut.

[0094] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A display panel, characterized in that: include: An array substrate; A white light emitting layer, located on the surface of the array substrate; A thin film encapsulation layer, located on a side of the white light emitting layer away from the array substrate; an optical crosstalk blocking layer, located on the thin film encapsulation layer away from the white light emitting layer; the optical crosstalk blocking layer comprises a microlens array and a first light transmission functional layer, the first light transmission functional layer is arranged on a side of the microlens array away from the thin film encapsulation layer; the microlens array comprises a plurality of microlens structures arranged in an array; A color filter layer, located on a side of the optical crosstalk blocking layer away from the thin film encapsulation layer, the color filter layer comprising a plurality of closely arranged filter units of different colors; Wherein, each of the microlens structures is arranged in one-to-one correspondence with each of the filter units, and the material of the first light transmission functional layer includes a functional material with high transmittance and high refractive index.

2. The display panel according to claim 1, characterized in that: The white light emitting layer comprises an anode layer, a pixel definition layer, an organic light emitting layer and a cathode layer; The pixel definition layer is arranged on a side of the anode layer away from the array substrate, the organic light emitting layer is arranged on a side of the anode layer and the pixel definition layer away from the array substrate, and the cathode layer is arranged on a side of the organic light emitting layer away from the pixel definition layer; Wherein, the pixel definition layer comprises a plurality of pixel spacing parts arranged at intervals, and a pixel definition area is formed between two adjacent pixel spacing parts; the pixel spacing parts are in an inverted trapezoidal shape; The anode layer includes a plurality of anodes, each of which is disposed in each of the pixel definition areas; The filter unit has a first orthographic projection on the array substrate, the pixel definition area has a second orthographic projection on the array substrate, and the two pixel spacing parts adjacent to the pixel definition area each have a third orthographic projection on the array substrate; the first orthographic projection covers the second orthographic projection and at least part of half of the two adjacent third orthographic projections.

3. The display panel according to claim 2, characterized in that: The width of the microlens structure and the width of the filter unit are both smaller than or equal to the sum of the widths of the pixel definition area and one of the pixel spacing parts.

4. The display panel according to claim 2, characterized in that: The width of the pixel definition area is smaller than the width of the microlens structure, and the width of the microlens structure is smaller than the width of the filter unit.

5. The display panel according to claim 2, characterized in that: Also includes a second light transmission functional layer; The second light transmission functional layer is disposed on a side of the color filter layer away from the light crosstalk blocking layer.

6. The display panel according to claim 2, characterized in that: Also included is the black matrix; A groove is provided on a surface of one side of the thin film encapsulation layer away from the array substrate, and the groove is in an inverted trapezoidal shape; The black matrix is ​​disposed in the groove.

7. The display panel according to claim 6, characterized in that: The lower bottom surface of the pixel spacing portion has a first width, and the upper bottom surface of the pixel spacing portion has a second width; The width of the groove is greater than the first width, and the width of the groove is less than the second width; The width of the groove is smaller than the width of the black matrix, and the width of the black matrix is ​​smaller than or equal to the width of the pixel spacer.

8. The display panel according to claim 1, characterized in that: The microlens structure is a spherical microlens, and the light-emitting surface of the microlens structure is a spherical surface convex outward; The thickness of the first light transmission functional layer is greater than the thickness of the microlens structure, and the thickness of the microlens structure is less than or equal to half of the width of the microlens structure.

9. A display device, characterized in that: Comprising the display panel as described in any one of claims 1-8.

10. A method for preparing a display panel, characterized in that: include: Providing an array substrate; forming a white light emitting layer on a surface of the array substrate; forming a thin film encapsulation layer on a side of the white light emitting layer away from the array substrate; A light crosstalk blocking layer is formed on a side of the thin film encapsulation layer away from the white light emitting layer; the light crosstalk blocking layer comprises a microlens array and a first light transmission functional layer; A color filter layer is formed on a side of the light crosstalk blocking layer away from the thin film encapsulation layer; the color filter layer includes a plurality of filter units of different colors that are closely arranged; Among them, the first light transmission functional layer is arranged on a side of the microlens array away from the thin film encapsulation layer; the microlens array includes a plurality of microlens structures arranged in an array; each of the microlens structures is arranged in a one-to-one correspondence with each of the filter units, and the material of the first light transmission functional layer includes a functional material with high transmittance and high refractive index.

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