Anti-peeping display panel, anti-peeping display device, and manufacturing method

Abstract

The present application discloses an anti-peeping display panel, an anti-peeping display device, and a manufacturing method. The anti-peeping display panel of one embodiment includes: a light-emitting unit layer and a light extraction layer, the light-emitting unit layer includes: a light-emitting layer and a pixel definition layer that defines the light-emitting layer, the light-emitting layer includes a normal pixel area and an anti-peeping pixel area, the light extraction layer includes: an optical path limiting layer and a light emitting layer arranged on the optical path limiting layer, wherein the optical path limiting layer includes at least one black matrix layer, the black matrix includes a plurality of openings, the orthographic projection of the black matrix on the substrate covers the orthographic projection of the pixel definition layer on the substrate, the light emitting layer includes: a lens structure and a sealing layer covering the lens structure, the lens structure includes a plurality of convex lenses, the orthographic projection of the normal pixel area on the substrate partially covers the orthographic projection of the convex lens on the substrate, and the refractive index of the lens structure is greater than the refractive index of the sealing layer. The embodiment of the present application defines the light path by the optical path limiting layer and uses the lens structure and the sealing layer to diverge the light.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to an anti-peeping display panel, an anti-peeping display device, and a manufacturing method. Background Art

[0002] As the use of display products in more and more scenarios, the switching between display sharing and privacy protection functions will gradually become a functional trend. Based on this demand, the current external anti-peep film and liquid crystal anti-peep device layer are no longer applicable. It is necessary to provide a new type of anti-peep display product with simple structure and excellent effect. Summary of the Invention

[0003] In order to solve at least one of the above problems, the first aspect of the present application provides an anti-peeping display panel, comprising: a light-emitting unit layer and a light extraction layer sequentially stacked on a base substrate, the light-emitting unit layer comprising: a light-emitting layer and a pixel defining layer defining the light-emitting layer;

[0004] The light-emitting layer includes a normal pixel area and an anti-peeping pixel area.

[0005] The light extraction layer includes: a light path limiting layer and a light extraction layer provided on the light path limiting layer.

[0006] The light path limiting layer includes at least one black matrix layer, the black matrix includes a plurality of openings, and the orthographic projection of the black matrix on the base substrate covers the orthographic projection of the pixel defining layer on the base substrate.

[0007] The light emitting layer includes: a lens structure and a sealing layer covering the lens structure. The lens structure includes multiple convex lenses. The orthographic projection of the normal pixel area on the base substrate partially covers the orthographic projection of the convex lens on the base substrate. The refractive index of the lens structure is greater than the refractive index of the sealing layer.

[0008] In some optional embodiments, the orthographic projection of the center of curvature of the convex lens on the base substrate falls within the orthographic projection of the black matrix on the base substrate.

[0009] In some optional embodiments, the light path limiting layer includes a first black matrix, a dielectric layer, and a second black matrix sequentially stacked on the base substrate.

[0010] In some optional embodiments, the thickness of the dielectric layer is greater than or equal to 10 μm and less than or equal to 20 μm.

[0011] In some optional embodiments, the aperture of the orthographic projection of the opening on the base substrate is larger than the aperture of the orthographic projection of the convex lens on the base substrate.

[0012] In some optional embodiments, a color filter sheet is included, and the color filter sheet includes a second black matrix and a color filter disposed in an opening of the second black matrix.

[0013] In some optional embodiments, the light-emitting unit layer includes a plurality of pixel units arranged in an array, each pixel unit includes a first sub-pixel having a first color, a second sub-pixel having a second color, and a third sub-pixel having a third color, each of the first sub-pixel, the second sub-pixel, and the third sub-pixel includes at least two anti-peep sub-pixels and at least two normal sub-pixels, the light-emitting layer of the normal sub-pixel is set in the normal pixel area, and the light-emitting layer of the anti-peep sub-pixel is set in the anti-peep pixel area.

[0014] In some optional embodiments, in each pixel unit, the anti-peep sub-pixel of each of the first sub-pixel, the second sub-pixel, and the third sub-pixel is defined by a pixel defining layer and has a common anode, and the normal sub-pixel of each of the first sub-pixel, the second sub-pixel, and the third sub-pixel is defined by a pixel defining layer and has a common anode.

[0015] A second aspect of the present application provides an anti-peeping display device, comprising the anti-peeping display panel described above.

[0016] A third aspect of the present application provides a method for manufacturing the above-mentioned anti-peeping display panel, comprising:

[0017] Providing the substrate;

[0018] forming the light-emitting unit layer on the base substrate, the light-emitting unit layer including: the light-emitting layer and the pixel defining layer defining the light-emitting layer, the light-emitting layer including the normal pixel area and the anti-peeping pixel area; and

[0019] Forming the light extraction layer on the light emitting unit layer includes:

[0020] forming a light path limiting layer on the light emitting unit layer;

[0021] forming a first material layer on the light path limiting layer;

[0022] patterning the first material layer using a grayscale mask to form the lens structure; and

[0023] forming the sealing layer on the light path limiting layer to form the light extraction layer, or

[0024] forming a light path limiting layer on the light emitting unit layer;

[0025] forming a first material layer on the light path limiting layer;

[0026] Using a stamping method to stamp the first material layer to form the lens structure; and

[0027] The sealing layer is formed on the light path limiting layer to form the light extraction layer.

[0028] The beneficial effects of this application are as follows:

[0029] In response to the current existing problems, the present application develops an anti-peeping display panel, an anti-peeping display device, and a manufacturing method, and provides a light extraction layer on the light-emitting layer, the light extraction layer includes a light path limiting layer and a light output layer, and the light path limiting layer includes a black matrix, and the light output layer includes a lens structure and a sealing layer. The lens structure corresponds to the normal pixel area, and the light path limiting layer ensures that the light is emitted at a small angle, while the interface between the lens structure and the sealing layer diverges the light in the normal pixel area. The overall anti-peeping film layer has a small thickness, a simple structure and a simple process flow, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 and Figure 2 A top view of pixel area division in a conventional anti-peeping display panel is shown;

[0032] Figure 3 A schematic cross-sectional view of an anti-peeping display panel according to an embodiment of the present application is shown;

[0033] Figure 4 A theoretical principle diagram showing a normal pixel area of ​​an anti-peeping display panel according to an embodiment of the present application is shown;

[0034] Figure 5 A light emitting principle diagram of a normal pixel area of ​​an anti-peeping display panel according to an embodiment of the present application is shown;

[0035] Figure 6 1. A comparison of the outgoing light paths of each pixel area in an anti-peeping display panel according to an embodiment of the present application is shown;

[0036] Figure 7 A top view of pixel division of an anti-peeping display panel according to an embodiment of the present application is shown;

[0037] Figure 8 A top view showing pixel division of an anti-peeping display panel according to another embodiment of the present application; and

[0038] Figures 9 to 13 A schematic flowchart of a method for manufacturing an anti-peeping display panel according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0039] To more clearly illustrate the present application, the present application is further described below in conjunction with preferred embodiments and accompanying drawings. Similar components in the accompanying drawings are represented by the same reference numerals. Those skilled in the art should understand that the specific description below is illustrative rather than restrictive and should not be used to limit the scope of protection of this application.

[0040] It should be noted that, the terms “on…”, “formed on…” and “disposed on…” used herein may mean that one layer is directly formed or disposed on another layer, or may mean that one layer is indirectly formed or disposed on another layer, i.e., there are other layers between the two layers.

[0041] Some products in related technologies use a zoned setting for pixel units, with the luminous layer distinguishing between anti-peeping pixel areas and normal pixel areas. Figure 1 and Figure 2 As shown, Figure 1 The cutting design is used to divide each pixel into an anti-privacy pixel area and a normal pixel area. When in anti-privacy mode, only the anti-privacy pixel area is lit; Figure 2 A partition design is adopted to divide the pixels into anti-peeping pixels and normal pixels. When in anti-peeping mode, only the anti-peeping pixels are lit. The anodes of the anti-peeping pixel area and the normal pixel area are independent of each other, and can be driven separately by increasing the light-emitting control signal.

[0042] It should be noted that in order to distinguish between the privacy-preventing pixel area and the normal pixel area, the top view is filled with a pattern to represent the normal pixel area, and the privacy-preventing pixel area is filled with white. However, those skilled in the art will understand that in actual applications, the luminous layer of the corresponding privacy-preventing pixel area and the normal pixel area emits the same color. Therefore, in the cross-sectional view, to reflect the consistent luminous color, the fill pattern of the luminous layer of the corresponding privacy-preventing pixel area and the normal pixel area is the same, which will not be further described below.

[0043] Based on one of the above questions, refer to Figure 3 As shown, one embodiment of the present application provides an anti-peeping display panel, comprising: a light-emitting unit layer 200 and a light extraction layer sequentially stacked on a base substrate 100, wherein the light-emitting unit layer 200 comprises: a light-emitting layer 201 and a pixel defining layer 202 defining the light-emitting layer 201,

[0044] The light-emitting layer 201 includes a normal pixel area and an anti-peeping pixel area.

[0045] The light extraction layer includes: a light path limiting layer 310 and a light extraction layer 320 provided on the light path limiting layer 310.

[0046] The light path limiting layer 310 includes at least one black matrix layer. The black matrix includes a plurality of openings. The orthographic projection of the black matrix on the base substrate 100 covers the orthographic projection of the pixel defining layer 202 on the base substrate 100 .

[0047] The light-emitting layer 320 includes: a lens structure and a sealing layer 322 covering the lens structure. The lens structure includes multiple convex lenses 321. The orthographic projection of the normal pixel area on the base substrate 100 partially covers the orthographic projection of the convex lens 321 on the base substrate 100. The refractive index of the lens structure is greater than the refractive index of the sealing layer 322.

[0048] In this embodiment, a light extraction layer is provided on the light-emitting layer, and the light extraction layer includes a light path limiting layer and a light output layer, and the light path limiting layer includes a black matrix, and the light output layer includes a lens structure and a sealing layer. The lens structure corresponds to the normal pixel area, and the light path limiting layer ensures that the light is emitted at a small angle, and the interface between the lens structure and the sealing layer diverges the light in the normal pixel area. The overall anti-peep film layer has a small thickness, a simple structure and a simple process flow, and has broad application prospects.

[0049] In order to illustrate the structure and function of this application, the following Figures 3 to 6 A specific example is described in detail.

[0050] Reference Figure 3 As shown, the display panel includes a light emitting unit layer 200 and a light extraction layer sequentially stacked on a base substrate 100 .

[0051] The light-emitting unit layer 200 includes a light-emitting layer 201, a pixel-defining layer 202 that defines the light-emitting layer 201, and an anode 203 and a cathode (not shown). As can be seen in the figure, the light-emitting layer 201 includes an anti-peeping pixel region (located on the left side of the figure) and a normal pixel region (located on the right side of the figure). The anodes 203 in the anti-peeping pixel region and the normal pixel region are independent and driven by different transistors.

[0052] The light extraction layer includes an optical path limiting layer 310 and a light extraction layer 320 disposed on the optical path limiting layer 310. The optical path limiting layer 310 is used to control the light emission direction of the light emitting layer 201, emitting light at a small angle. The light extraction layer 320 is used to further modulate the light emitted from the optical path limiting layer 310 to ensure that the light emission direction of the normal pixel area is divergent.

[0053] Specifically, in this example, the light path limiting layer 310 includes two layers of black matrices, namely, a first black matrix 311 and a second black matrix 313, with a dielectric layer 312 arranged therebetween. Each layer of the black matrix includes a plurality of openings, and the orthographic projection of the black matrix on the base substrate 100 covers the orthographic projection of the pixel defining layer 202 on the base substrate 100. The black matrix can absorb light and is opaque. By providing a multi-layer composite layer formed by the first black matrix 311, the dielectric layer 312 and the second black matrix 313, a light-limiting channel can be formed with the opening area of ​​the multi-layer black matrix. Compared with a single black matrix, the light convergence effect is better, thereby having a better light path limiting effect. In essence, the light output angle is limited by the opening size and the channel length (i.e., the distance between the first black matrix 311 and the second black matrix 313, i.e., the thickness of the dielectric layer 312). In order to take into account the light convergence requirements of the anti-peep pixel area and the light divergence requirements of the normal pixel area, refer to Figure 3 As shown, in the embodiment of the present application, the orthographic projection of the opening on the base substrate 100 can be equal to the orthographic projection of each pixel on the base substrate 100. It should be understood that the thicker the dielectric layer 312 is, the smaller the light emission angle of the light emitted from the self-luminous layer 201 is, and the more convergent it is. Taking into account that the resin material (such as OC) has a low viscosity and is difficult to form a thick film, in particular, the material of the dielectric layer 312 can be inkjet printable ink (IJP). In addition, taking into account the thickness requirements of the display panel, preferably, when the thickness of the dielectric layer 312 is greater than or equal to 10μm and less than or equal to 20μm, it can take into account both the product thickness and the light emission angle requirements.

[0054] It should be noted that this example only schematically illustrates a two-layer black matrix configuration, but is not limited to this. Providing a single layer of black matrix can also absorb stray light and limit the light path. Furthermore, if necessary, more layers of black matrix are also possible. Furthermore, for products with low thickness requirements, when each dielectric layer 312 is limited, providing more layers of black matrix can increase the overall length of the light-limiting channel to meet light convergence requirements and improve stray light absorption.

[0055] Considering that in normal display mode, although the pixel driving circuit controls both the anti-peeping pixel area and the normal pixel area to emit light, the overall light-emitting area of ​​the display panel has been increased compared to the case where only the anti-peeping pixel area emits light, it is still hoped that the normal display mode will be more conducive to the sharing of displayed content.

[0056] In order to achieve this purpose, in particular, in the embodiments of the present application, reference is made to Figure 3As shown, the light-emitting layer 320 includes: a lens structure and a sealing layer 322 covering the lens structure, the lens structure includes a plurality of convex lenses 321, the orthographic projection of the normal pixel area on the base substrate 100 partially covers the orthographic projection of the convex lens 321 on the base substrate 100, and the refractive index of the lens structure is greater than the refractive index of the sealing layer.

[0057] Ginseng Figure 4 As shown, the theoretical basis for the above configuration is that the path of light changes at interfaces with different refractive indices. Assuming that refractive index n1 is greater than refractive index n2, the relationship holds: n1sinθ1 = n2sinθ2, so θ1 is greater than θ2. In other words, when light passes from a high-refractive-index material to a low-refractive-index material, the angle of incidence is less than the angle of refraction. When light passes from a low-refractive-index material to a high-refractive-index material, the angle of incidence is greater than the angle of refraction.

[0058] In the embodiments of the present application, further optimization is performed based on the above theoretical basis, referring to Figure 5 As shown, a lens structure composed of multiple convex lenses 321 is arranged to form an interface with the sealing layer 322. Because the refractive index n1 of the lens structure is greater than the refractive index n2 of the sealing layer and the special structural characteristics of the convex lens, when the light emitted from different light-emitting positions in the light-emitting layer 201 enters the interface of the arc convex, the optical light 1-1 and light 1-2 emitted from the first light-emitting position and the optical light 2-1 and light 2-2 emitted from the second light-emitting position are all emitted at a larger refraction angle, and a divergent effect is formed.

[0059] Optionally, the refractive index of the sealing layer 322 is less than or equal to 1.5, and the refractive index of the lens structure is greater than or equal to 1.65. For example, the refractive index of the sealing layer 322 is greater than or equal to 1.45 and less than or equal to 1.5, and the refractive index of the lens structure is greater than or equal to 1.65 and less than or equal to 1.75. This application is not intended to limit the materials of the sealing layer 322 and the lens structure; both materials may be acrylic or epoxy resin materials, and the desired refractive index relationship between the two may be achieved by adding nano-inorganic particles.

[0060] It is worth mentioning that based on the convex structure of the convex lens, Figure 5 As shown, for the convex lens shown in the figure, the arc-shaped interface formed by half of the area and the sealing layer 322 can use its curvature trend to produce a diverging effect on the light incident on the interface. It can be understood that the curvature trend of the other half of the area will have an opposite effect on the light incident on the interface. Therefore, when the orthographic projection of the normal pixel area on the base substrate 100 is set to partially cover the orthographic projection of the convex lens 321 on the base substrate 100, a certain diverging effect can be produced on the entire light incident on the opening. When the normal pixel area is illuminated, other users at a large angle can share the display content, and the normal pixel area appears brighter.

[0061] Preferably, the orthographic projection of the center of curvature of the convex lens 321 on the base substrate 100 falls within the orthographic projection of the black matrix on the base substrate 100. The center of curvature represents the intersection of the normals of two points on the arc of the convex lens 321. This arrangement ensures that light emitted from the normal pixel area produces a diverging effect when it enters the interface between the convex lens 321 and the sealing layer 322. Figure 5 , it is shown that the orthographic projection of the center of curvature of the convex lens 321 on the base substrate 100 is located at the boundary of the orthographic projection of the black matrix on the base substrate 100 .

[0062] Specifically, in order to ensure that the orthographic projection of the center of curvature of the convex lens 321 on the base substrate 100 falls within the orthographic projection of the black matrix on the base substrate 100, the aperture of the orthographic projection of the opening of the black matrix on the base substrate 100 is larger than the aperture of the orthographic projection of the convex lens 321 on the base substrate 100.

[0063] In addition, when the diameter of the orthographic projection of the opening of the black matrix on the base substrate 100 is larger than the diameter of the orthographic projection of the convex lens 321 on the base substrate 100, Figure 3 As shown, the central area of ​​the opening is not covered by the convex lens 321, and the light does not experience the divergence of the convex lens 321 when it enters this area. However, the emission angle of the light in the central area of ​​the opening in the second black matrix 313 is very small, and the closer to the center position, the closer the emission angle is to 0°. In the edge area of ​​the opening, the light has a large emission angle and tends to diverge. For more divergent light, the tendency to continue to diverge outward after passing through the interface is more obvious, and the effect is more significant. However, through this setting, the size of the convex lens 321 can be reduced, thereby reducing the thickness of the lens structure, making the overall thickness of the light extraction layer thinner.

[0064] Through the above settings, refer to Figure 6 As can be seen from the comparison diagram, the high-angle stray light in the light emitted by the anti-peeping pixel area is absorbed by the first black matrix 311 and the second black matrix 313 in the optical path limiting layer 310, thereby achieving a narrow-angle emission. While the high-angle stray light in the light emitted by the normal pixel area is absorbed by the optical path limiting layer 310, limiting the light angle, the unabsorbed light is further dispersed by refraction at the interface between the lens structure and the sealing layer, achieving a wide-angle emission. Therefore, the display panel provided by the embodiment of the present application can achieve both anti-peeping display and shared display based on zoned driving.

[0065] In another alternative embodiment, referring to Figure 7As shown, the display panel includes a color filter (CF), which includes a second black matrix 313' and a color filter 330 disposed in the opening of the second black matrix 313'. In other words, the color filter replaces a single black matrix layer, thereby eliminating the need for subsequent polarizer attachment. Of course, those skilled in the art will understand that the color of the color filter 330 is the same as the color of the corresponding light-emitting layer, and this will not be further described herein.

[0066] On the other hand, considering the current anti-privacy cutting design, the divided pixels are only reduced in size in one direction, while the pixel size of the anti-privacy pixel area in the partition design is the same as the pixel size of the normal display. Figure 1 w1 in Figure 2 In the example w2, the anti-privacy pixel area has a relatively large pixel size, typically 25μm-30μm. The larger the pixel size, the easier it is for light to penetrate through the sidewalls of the pixel, which is disadvantageous for anti-privacy displays. The higher the resolution of the display product, the more anti-privacy pixel areas are distributed, and the worse the anti-privacy effect will be.

[0067] In order to solve this problem, this application further optimizes and cuts each pixel. Figure 8 As shown in the figure, a schematic diagram of the pixel area in the display panel of the cutting design method is shown after cutting optimization. It can be understood that if the pixel area is cut along the line AA' in the figure, the pixel area can be cut. Figure 1 or Figure 6 Cross-sectional view shown.

[0068] It should be noted that the normal pixel area does not worry about the display effect being degraded due to further cutting due to the divergence effect of the lens structure. Therefore, in order to simplify the process design, the anti-peeping pixel area and the normal pixel area can be cut in the same way at the same time.

[0069] Specifically, the light-emitting unit layer 200 includes a plurality of pixel units arranged in an array, each pixel unit includes a first sub-pixel having a first color, a second sub-pixel having a second color, and a third sub-pixel having a third color, each of the first sub-pixel, the second sub-pixel, and the third sub-pixel includes at least two anti-peep sub-pixels and at least two normal sub-pixels, the light-emitting layer 201 of the normal sub-pixel is set in the normal pixel area, and the light-emitting layer 201 of the anti-peep sub-pixel is set in the anti-peep pixel area.

[0070] Through this arrangement, based on the segmentation design, the first sub-pixel, the second sub-pixel, and the third sub-pixel are further segmented into at least two anti-peeping sub-pixels and a normal sub-pixel, so that each sub-pixel can be further cut in two directions, thereby reducing the sub-pixel size, reducing the possibility of light transmission from the sidewall, and further improving the anti-peeping display effect.

[0071] It is worth mentioning that because the size of the anti-peeping sub-pixels and normal sub-pixels is cut down, it is possible to achieve any combination of the anti-peeping pixel area and the normal pixel area, so that the total area of ​​the anti-peeping pixel area and the normal pixel area is not necessarily 1:1. If the application scenario of the normal display mode of the display product is used more frequently, the ratio of normal sub-pixels will be increased; if the application scenario of the anti-peeping display mode is used more frequently, the ratio of anti-peeping sub-pixels will be increased. For example, refer to Figure 9 As shown, the number of normal sub-pixels in the normal pixel area is set to 3:1 relative to the anti-peeping sub-pixels. Of course, the specific ratio is not restrictive and will not be described in detail here.

[0072] Specifically, because the further segmentation design is implemented based on the same seed pixel, that is, the segmented anti-peeping sub-pixels can be controlled according to the same driving method, and the normal sub-pixels can also be controlled according to the same driving method, the segmentation can be achieved by patterning the pixel definition layer. That is, in each pixel unit, the anti-peeping sub-pixel of each of the first sub-pixel, the second sub-pixel, and the third sub-pixel is defined by the pixel definition layer and has a common anode 203, and the normal sub-pixel of each of the first sub-pixel, the second sub-pixel, and the third sub-pixel is defined by the pixel definition layer and has a common anode 203.

[0073] Compared to patterning the anode by metal sputtering, patterning the pixel definition layer can make the size very small. Preferably, by leveraging the material characteristics of the pixel definition layer, the size of the anti-peeping sub-pixel and the normal sub-pixel can be greater than or equal to 5μm and less than or equal to 10μm.

[0074] Corresponding to the anti-peeping display panel, an embodiment of the present application further provides a method for manufacturing the anti-peeping display panel, including:

[0075] providing a substrate substrate,

[0076] A light-emitting unit layer is formed on the base substrate, the light-emitting unit layer including: a light-emitting layer and a pixel defining layer defining the light-emitting layer, the light-emitting layer including a normal pixel area and an anti-peeping pixel area,

[0077] forming a light extraction layer on the light emitting unit layer,

[0078] The light extraction layer includes: a light path limiting layer and a light extraction layer provided on the light path limiting layer.

[0079] The light path limiting layer includes at least one black matrix layer, the black matrix includes a plurality of openings, and the orthographic projection of the black matrix on the base substrate covers the orthographic projection of the pixel defining layer on the base substrate.

[0080] The light emitting layer includes: a lens structure and a sealing layer covering the lens structure. The lens structure includes multiple convex lenses. The orthographic projection of the normal pixel area on the base substrate partially covers the orthographic projection of the convex lens on the base substrate. The refractive index of the lens structure is greater than the refractive index of the sealing layer.

[0081] Forming a light extraction layer on the light emitting unit layer further includes:

[0082] A light path limiting layer is formed on the light emitting unit layer; a first material layer is formed on the light path limiting layer; the first material layer is patterned using a grayscale mask to form a lens structure; a sealing layer is formed on the light path limiting layer to form a light extraction layer.

[0083] or

[0084] A light path limiting layer is formed on the light emitting unit layer; a first material layer is formed on the light path limiting layer; the first material layer is stamped to form a lens structure using a stamping method; and a sealing layer is formed on the light path limiting layer to form a light extraction layer.

[0085] In this embodiment, a light extraction layer is formed on the light-emitting layer, the light extraction layer includes a light path limiting layer and a light output layer, and the light path limiting layer includes a black matrix, and the light output layer includes a lens structure and a sealing layer. The lens structure corresponds to the normal pixel area, and the light path limiting layer is used to ensure that the light is emitted at a small angle, while the interface between the lens structure and the sealing layer diverges the light in the normal pixel area. The overall anti-peep film layer has a small thickness, a simple structure and a simple process flow, and has broad application prospects.

[0086] The following combination Figures 10 to 13 ,by Figure 1 The specific manufacturing process is described by taking the display panel shown as an example.

[0087] Reference Figure 10 As shown, in step S1 , a driving circuit layer 700 is formed on a base substrate, a light emitting unit layer 200 is formed on the driving circuit layer 700 , and then a thin film encapsulation layer (TFE) 400 is formed on the light emitting unit layer 200 .

[0088] Specifically, the base substrate 100 can be a glass substrate or a flexible material. Flexible materials include polyimide (PI), PEN, PET, etc. The flexible substrate can be a single-layer structure or a multi-layer structure. If it is a multi-layer structure, a buffer layer can be added between the layers. The buffer layer is an inorganic thin film and can be SiNx, SiOx, or a composite layer thereof.

[0089] A driving circuit layer 700 is formed on the base substrate 100 . Before forming the driving circuit layer, a buffer layer 600 is formed first.

[0090] The driving circuit layer 700 includes a thin film transistor, which includes an active layer 701 , a gate insulating layer 702 , a gate 703 , a dielectric layer 704 , and a source and drain electrode 705 .

[0091] The active layer 701 is a polycrystalline silicon layer, and the material of the gate insulating layer 702 can be other inorganic insulating materials such as silicon oxide, silicon nitride or silicon oxynitride. The gate insulating layer 702 can be a single layer or a multilayer structure. The material of the gate 703 can also be a multilayer metal structure, and the film layer combination can be selected from one of molybdenum / aluminum / molybdenum (Mo / Al / Mo), molybdenum / copper (Mo / Cu), molybdenum-niobium alloy / copper (MoNb / Cu), molybdenum-niobium alloy / copper / molybdenum-titanium alloy (MoNb / Cu / MoTi) or a stack thereof. Through holes are formed after the dielectric layer 704, and the source and drain electrodes 705 are formed by magnetron sputtering a metal layer. The film layer combination of the source and drain electrodes 705 can be selected from one of Mo / Al / Mo, Mo / Cu, MoNb / Cu, MoNb / Cu / MoTi or a stack thereof.

[0092] After forming the thin film transistor, a planarization layer 800 may be deposited, and then the light emitting layer 300 may be formed on the planarization layer 800 .

[0093] Specifically, it includes making an anode 202, a pixel defining layer 203, a light-emitting layer 201, a cathode, etc. The light-emitting layer 201 and the cathode (not shown) can be formed by a vacuum evaporation process. The light-emitting layer includes but is not limited to a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, etc. In addition, although not shown, a support column structure, a retaining wall structure, etc. can also be made. The materials of the pixel defining layer 203, the support column, the retaining wall and the planarization layer 800 are the same, all of which are organic insulating materials and can be made of polyimide photoresist. The isolation column is mainly arranged in the display area, while the retaining wall structure is located in the non-realistic area. The retaining wall can be formed by one or more layers of the planarization layer 800, the pixel definition layer 203 and the isolation column layer.

[0094] Afterwards, a thin film encapsulation layer 400 is formed on the light-emitting unit layer 200. The thin film encapsulation layer 400 includes an inorganic thin film layer that blocks water and oxygen and an organic layer that has stress release and flattening effects. The inorganic layer is prepared by chemical vapor deposition or atomic layer deposition. The material can be silicon nitride, silicon oxide, silicon oxynitride, aluminum oxide, titanium oxide, etc., but is not limited thereto. The organic layer is prepared by inkjet printing, screen printing, dispensing, etc. First, a first inorganic layer is deposited on the sub-pixel (i.e., the light-emitting device). The first inorganic layer can be one of the aforementioned materials or a combination of multiple overlapping materials. The protection area of ​​the inorganic layer must be larger than the display area of ​​the display area. Generally speaking, the vertical projection of the coverage area is outside the retaining wall. A first organic layer is prepared on the first inorganic layer. The coverage area of ​​the first organic layer is smaller than the inorganic layer, and the vertical projection of its coverage area is at least larger than the cathode. A second inorganic layer is made on the first organic layer. The production method and materials of the second inorganic layer are the same as those of the first inorganic layer. Its coverage area can be the same as that of the first inorganic layer or larger than that of the first inorganic layer. Likewise, it can be composed of a single inorganic material or a combination of multiple inorganic layers.

[0095] In step S2, refer to Figure 11 As shown, if the display panel is an integrated touch display panel, a touch layer 500 is formed on the thin film encapsulation layer 400, and then a first black matrix 311 is formed on the touch layer 500. The specific process is to deposit a black matrix material layer after forming the touch layer 500 on the thin film encapsulation layer 400, and then pattern the black matrix material layer through exposure, development, baking and curing processes to form the first black matrix 311.

[0096] In step S3, refer to Figure 12 As shown, a dielectric layer 312 is formed on the first black matrix 311 by inkjet printing, and then a second black matrix 313 is formed on the dielectric layer 312 to form the light path limiting layer 310. The specific process is similar to the process of forming the first black matrix 311 and will not be repeated here.

[0097] In step S4, refer to Figure 13 As shown, a lens structure is formed on the second black matrix 313. Specifically, the process includes forming a first material layer on the second black matrix 313; patterning the first material layer using a grayscale mask to form the lens structure, or forming a first material layer on the second black matrix 313 and stamping the first material layer using a stamping method to form the lens structure.

[0098] Through this setting, the process characteristics of patterning using a grayscale mask or the process characteristics of patterning using a stamping method can be used to form a lens structure with multiple convex lenses, thereby realizing the structure of the embodiment of the present application through simple process steps.

[0099] Then, a sealing layer 322 is formed on the lens structure by a deposition process to form a light extraction layer. In addition, since the second black matrix 313 in this example is not the second black matrix in the color filter sheet, a polarizer can be attached later, which will not be described in detail here.

[0100] Based on the same inventive concept, embodiments of the present application further provide an anti-peeping display device, including the anti-peeping display panel described in the above embodiments. Since the anti-peeping display panel included in the anti-peeping display device provided in the embodiments of the present application corresponds to the anti-peeping display panel provided in the above embodiments, the above embodiments also apply to the anti-peeping display device provided in the present embodiment and will not be described in detail in this embodiment.

[0101] In this embodiment, the anti-peeping display device can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, or a navigator.

[0102] In response to the current existing problems, the present application develops an anti-peeping display panel, an anti-peeping display device, and a manufacturing method, and provides a light extraction layer on the light-emitting layer, the light extraction layer includes a light path limiting layer and a light output layer, and the light path limiting layer includes a black matrix, and the light output layer includes a lens structure and a sealing layer. The lens structure corresponds to the normal pixel area, and the light path limiting layer ensures that the light is emitted at a small angle, while the interface between the lens structure and the sealing layer diverges the light in the normal pixel area. The overall anti-peeping film layer has a small thickness, a simple structure and a simple process flow, and has broad application prospects.

[0103] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation methods of the present application. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all implementation methods here. All obvious changes or modifications derived from the technical solution of the present application are still within the scope of protection of the present application.

Claims

1. An anti-peeping display panel, characterized in that: include: A light emitting unit layer and a light extraction layer are sequentially stacked on a base substrate, wherein the light emitting unit layer includes: a light emitting layer and a pixel defining layer defining the light emitting layer. The light-emitting layer includes a normal pixel area and an anti-peeping pixel area. The light extraction layer includes: a light path limiting layer and a light extraction layer provided on the light path limiting layer. The light path limiting layer includes at least one black matrix, the black matrix includes a plurality of openings, and the orthographic projection of the black matrix on the base substrate covers the orthographic projection of the pixel defining layer on the base substrate. The light-emitting layer includes: a lens structure and a sealing layer covering the lens structure, the lens structure includes a plurality of convex lenses, the orthographic projection of the normal pixel area on the base substrate partially covers the orthographic projection of the convex lenses on the base substrate, and the refractive index of the lens structure is greater than the refractive index of the sealing layer. The orthographic projection of the center of curvature of the convex lens on the base substrate falls within the orthographic projection of the black matrix on the base substrate.

2. The anti-peeping display panel according to claim 1, wherein: The light path limiting layer includes a first black matrix, a dielectric layer, and a second black matrix which are sequentially stacked on the base substrate.

3. The anti-peeping display panel according to claim 2, wherein: The thickness of the dielectric layer is greater than or equal to 10 μm and less than or equal to 20 μm.

4. The anti-peeping display panel according to claim 1, wherein: The aperture of the orthographic projection of the opening on the base substrate is larger than the aperture of the orthographic projection of the convex lens on the base substrate.

5. The anti-peeping display panel according to claim 2, wherein: The color filter sheet includes the second black matrix and color filters arranged in the openings of the second black matrix.

6. The anti-peeping display panel according to claim 1, wherein: The light-emitting unit layer includes a plurality of pixel units arranged in an array, each pixel unit includes a first sub-pixel having a first color, a second sub-pixel having a second color, and a third sub-pixel having a third color, each of the first sub-pixel, the second sub-pixel, and the third sub-pixel includes at least two anti-peeping sub-pixels and at least two normal sub-pixels, the light-emitting layer of the normal sub-pixel is arranged in the normal pixel area, and the light-emitting layer of the anti-peeping sub-pixel is arranged in the anti-peeping pixel area.

7. The anti-peeping display panel according to claim 6, wherein: In each of the pixel units, the anti-peep sub-pixel of each of the first sub-pixel, the second sub-pixel, and the third sub-pixel is defined by the pixel defining layer and has a common anode, and the normal sub-pixel of each of the first sub-pixel, the second sub-pixel, and the third sub-pixel is defined by the pixel defining layer and has a common anode.

8. An anti-peeping display device, characterized in that: The anti-peeping display panel comprises the anti-peeping display panel according to any one of claims 1 to 7.

9. A method for manufacturing the anti-peeping display panel according to any one of claims 1 to 7, characterized in that: include: Providing the substrate; forming the light-emitting unit layer on the base substrate, the light-emitting unit layer including: the light-emitting layer and the pixel defining layer defining the light-emitting layer, the light-emitting layer including the normal pixel area and the anti-peeping pixel area; and Forming the light extraction layer on the light emitting unit layer includes: forming a light path limiting layer on the light emitting unit layer; forming a first material layer on the light path limiting layer; patterning the first material layer using a grayscale mask to form the lens structure; and forming the sealing layer on the light path limiting layer to form the light extraction layer, or forming a light path limiting layer on the light emitting unit layer; forming a first material layer on the light path limiting layer; Using a stamping method to stamp the first material layer to form the lens structure; and The sealing layer is formed on the light path limiting layer to form the light extraction layer.

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