Disclosure of Invention
In order to solve at least one of the above problems, a first aspect of the present application provides a privacy display panel comprising a light emitting unit layer and a light extraction layer sequentially stacked on a substrate, the light emitting unit layer comprising a light emitting layer and a pixel defining layer defining the light emitting layer,
The light-emitting layer comprises a normal pixel area and a peep-proof pixel area,
The light extraction layer comprises a light path limiting layer and a light emergent layer arranged on the light path limiting layer,
Wherein the light path limiting layer comprises at least one layer of black matrix, the black matrix comprises a plurality of openings, the orthographic projection of the black matrix on the substrate covers the orthographic projection of the pixel defining layer on the substrate,
The light-emitting layer comprises a lens structure and a sealing layer covering the lens structure, wherein the lens structure comprises a plurality of convex lenses, and the orthographic projection part of the normal pixel area on the substrate covers the orthographic projection of the convex lenses on the substrate, and the refractive index of the lens structure is larger than that of the sealing layer.
In some alternative embodiments, the orthographic projection of the center of curvature of the convex lens onto the substrate falls within the orthographic projection of the black matrix onto the substrate.
In some alternative embodiments, the optical path limiting layer includes a first black matrix, a dielectric layer, and a second black matrix sequentially stacked on the substrate.
In some alternative embodiments, the dielectric layer has a thickness of 10 μm or more and 20 μm or less.
In some alternative embodiments, the aperture of the orthographic projection of the opening on the substrate is larger than the aperture of the orthographic projection of the convex lens on the substrate.
In some alternative embodiments, a color film sheet is included, the color film sheet including a second black matrix and a color filter disposed in an opening of the second black matrix.
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 peep-preventing sub-pixels and at least two normal sub-pixels, the light emitting layer of the normal sub-pixel is disposed in the normal pixel region, and the light emitting layer of the peep-preventing sub-pixel is disposed in the peep-preventing pixel region.
In some alternative embodiments, in each pixel cell, the privacy sub-pixels of each of the first, second, and third sub-pixels are defined by the pixel defining layer and have a common anode, and the normal sub-pixels of each of the first, second, and third sub-pixels are defined by the pixel defining layer and have a common anode.
A second aspect of the present application provides a privacy display device comprising a privacy display panel as described above.
A third aspect of the present application provides a method of manufacturing the above-described privacy display panel, comprising:
providing the substrate base;
forming the light emitting unit layer on the substrate, the light emitting unit layer including the light emitting layer including the normal pixel region and the peep-preventing pixel region, and the pixel defining layer defining the light emitting layer
Forming the light extraction layer on the light emitting unit layer, including:
forming a light path limiting layer on the light emitting unit layer;
Forming a first material layer on the optical path limiting layer;
Patterning the first material layer with a gray-scale mask to form the lens structure, and
Forming the seal 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 optical path limiting layer;
molding the first material layer by a molding method to form the lens structure, and
And forming the sealing layer on the light path limiting layer to form the light extraction layer.
The beneficial effects of the application are as follows:
Aiming at the existing problems at present, the application designs a peep-proof display panel, a peep-proof display device and a manufacturing method, and provides a light extraction layer on a light-emitting layer, wherein the light extraction layer comprises a light path limiting layer and a light-emitting layer, the light path limiting layer comprises a black matrix, the light-emitting layer comprises a lens structure and a sealing layer, the lens structure corresponds to a normal pixel area, the light is emitted at a small angle through the light path limiting layer, the interface between the lens structure and the sealing layer diverges the light of the normal pixel area, and the whole peep-proof film has small thickness, simple structure and simple process flow and wide application prospect.
Detailed Description
In order to more clearly illustrate the present application, the present application will be further described with reference to preferred embodiments and the accompanying drawings. Like parts in the drawings are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this application is not limited to the details given herein.
It should be noted that "on", "formed on", "and" disposed on "as described herein may mean that one layer is formed directly or disposed on another layer, or that one layer is formed or disposed on another layer, i.e., that other layers are present between the two layers.
The related art has products in which the pixel units are arranged in a partitioned manner, the light-emitting layer is used for distinguishing the peep-proof pixel area and the normal pixel area, the specific form is shown in fig. 1 and 2, wherein in fig. 1, a cutting design is adopted to divide each pixel point into the peep-proof pixel area and the normal pixel area, when in the peep-proof mode, only the peep-proof pixel area is lighted, in fig. 2, the pixel is divided into the peep-proof pixel area and the normal pixel area by adopting a partitioned design, when in the peep-proof mode, only the peep-proof pixel area is lighted, anodes of the peep-proof pixel area and the normal pixel area are mutually independent, and a light-emitting control signal can be added for independent driving.
Note that in order to distinguish between the peep-preventing pixel region and the normal pixel region herein, the normal pixel region is indicated by the pattern filling in the top view, and the peep-preventing pixel region is indicated by the white filling. However, it should be understood by those skilled in the art that in practical applications, the light emitting color of the light emitting layer of the normal pixel area of the corresponding peep-proof pixel area is the same. Therefore, in the cross-sectional view, in order to embody the feature of consistent light-emitting color, the filling patterns of the light-emitting layers of the peep-proof pixel area and the normal pixel area which are correspondingly arranged are the same, and the description thereof is omitted.
In view of one of the above problems, referring to fig. 3, an embodiment of the present application provides a privacy display panel including a light emitting unit layer 200 and a light extraction layer sequentially stacked on a substrate base 100, the light emitting unit layer 200 including a light emitting layer 201 and a pixel defining layer 202 defining the light emitting layer 201,
The light emitting layer 201 includes a normal pixel region and a peep-proof pixel region,
The light extraction layer includes a light path limiting layer 310 and a light extraction layer 320 disposed on the light path limiting layer 310,
Wherein the light path limiting layer 310 comprises at least one layer of black matrix comprising a plurality of openings, the orthographic projection of the black matrix on the substrate 100 covers the orthographic projection of the pixel defining layer 202 on the substrate 100.
The light-emitting layer 320 includes a lens structure including a plurality of convex lenses 321 and an encapsulant layer 322 covering the lens structure, and a front projection portion of the normal pixel region on the substrate 100 covers a front projection of the convex lenses 321 on the substrate 100, and a refractive index of the lens structure is greater than a refractive index of the encapsulant layer 322.
In this embodiment, a light extraction layer is provided on the light emitting layer, the light extraction layer includes a light path limiting layer and a light emitting layer, and the light path limiting layer includes a black matrix, the light emitting layer includes a lens structure and a sealing layer, the lens structure corresponds to a normal pixel region, light is emitted in a small angle through the light path limiting layer, and the interface between the lens structure and the sealing layer diverges light in the normal pixel region, so that the overall peep-proof film has a small thickness, a simple structure and a simple process flow, and has a wide application prospect.
In order to illustrate the structure and function of the present application, a specific example will be described in detail with reference to fig. 3 to 6.
Referring to fig. 3, the display panel includes a light emitting unit layer 200 and a light extraction layer sequentially stacked on a substrate base 100.
The light emitting cell layer 200 includes a light emitting layer 201, a pixel defining layer 202 defining the light emitting layer 201, and further the light emitting cell layer 200 includes an anode 203 and a cathode, not shown. As can be seen in the figure, the light-emitting layer 201 includes a peep-preventing pixel region (located on the left side in the figure) and a normal pixel region (located on the right side in the figure), and anodes 203 of the peep-preventing pixel region and the normal pixel region are independent from each other and driven by different transistors.
The light extraction layer includes a light path limiting layer 310 and a light extraction layer 320 disposed on the light path limiting layer 310. The light path limiting layer 310 is used to limit the light emitting direction of the light emitting layer 201, and emits at a small angle. The light emitting layer 320 is used for further performing light path modulation on the light emitted from the light path limiting layer 310, so as to ensure that the light emitting direction of the normal pixel area diverges.
Specifically, in this example, the optical path limiting layer 310 includes two black matrices, i.e., a first black matrix 311 and a second black matrix 313, between which a dielectric layer 312 is disposed, each black matrix including a plurality of openings, and an orthographic projection of the black matrix on the substrate 100 covers an orthographic projection of the pixel defining layer 202 on the substrate 100. The black matrix can absorb light and is opaque, and a light limiting channel can be formed in an opening area of the multi-layer black matrix by arranging the multi-layer composite layer formed by the first black matrix 311, the dielectric layer 312 and the second black matrix 313, so that the light converging effect is better compared with that of a layer of black matrix, and the light limiting effect is better. In essence, the light exit angle is limited by the size of the opening 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), and in order to satisfy both the requirements of the peep-proof pixel region for converging light and the requirements of the normal pixel region for diverging light, referring to fig. 3, in an embodiment of the present application, the front projection of the opening on the substrate 100 may be equal to the front projection of each pixel point on the substrate 100. It should be understood that the thicker the dielectric layer 312, the smaller the exit angle of the outgoing light from the light emitting layer 201, the more concentrated. In view of the low viscosity of the resin material (e.g., OC), it is difficult to form a thick film, and in particular, the material of the dielectric layer 312 may be ink-jet printing Ink (IJP). In addition, considering the thickness requirement of the display panel, it is preferable that the thickness of the dielectric layer 312 is 10 μm or more and 20 μm or less, both the product thickness and the light emitting angle requirement can be satisfied.
Note that this example only schematically shows a configuration scheme of a two-layer black matrix, but is not limited thereto. The black matrix can also absorb stray light and limit the light path when being provided with a layer of black matrix. In addition, for products with low thickness requirements, under the condition that each dielectric layer 312 is limited, the arrangement of more layers of black matrixes can increase the whole length of the light limiting channel so as to meet the light emitting convergence requirement and improve the stray light absorption effect.
Considering that in the normal display mode, although both the peep-proof pixel region and the normal pixel region are controlled to emit light by the pixel driving circuit, the overall light emitting area of the display panel has been increased relative to the case where only the peep-proof pixel region emits light, it is still desirable to facilitate sharing of display contents in the normal display mode.
To achieve this object, particularly, in the embodiment of the present application, referring to fig. 3, the light-emitting layer 320 includes a lens structure including a plurality of convex lenses 321 and an encapsulation layer 322 covering the lens structure, and a front projection portion of the normal pixel region on the substrate 100 covers a front projection of the convex lenses 321 on the substrate 100, and a refractive index of the lens structure is greater than a refractive index of the encapsulation layer.
As shown in fig. 4, the theoretical basis of the above arrangement is that the light proceeds along the path at the interface with different refractive indexes, and assuming that the refractive index n1 is larger than the refractive index n2, there is a relationship that n1sin θ1=n2sin θ2, and thus θ1 is larger than θ2. That is, when a light ray enters the low refractive index material from the high refractive index material, the incident angle is smaller than the refraction angle, and when a light ray enters the high refractive index material from the low refractive index material, the incident angle is larger than the refraction angle.
In the embodiment of the present application, based on the above theoretical basis, as shown in fig. 5, by providing a lens structure formed by a plurality of convex lenses 321, an interface is formed 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 lenses, when the light emitted from different light emitting positions in the light emitting layer 201 enters the interface of the arc protrusion, the optical light 1-1 emitted from the first light emitting position, the optical light 1-2 emitted from the second light emitting position, and the optical light 2-1 and the optical light 2-2 emitted from the second light emitting position all emit at larger refraction angles, and form a divergent effect.
Optionally, the refractive index of the sealing layer 322 is 1.5 or less, and the refractive index of the lens structure is 1.65 or more. For example, the refractive index of the sealing layer 322 is 1.45 or more and 1.5 or less, and the refractive index of the lens structure is 1.65 or more and 1.75 or less. The present application is not intended to be limited to the materials of the seal layer 322 and the lens structure, and both materials may be acrylic or epoxy resin materials, and then the nano inorganic particles are added to make the two satisfy the required refractive index relationship.
It should be noted that, based on the convex structure of the convex lens, referring to fig. 5, for the convex lens shown in the figure, the arc-shaped interface formed by half of the area and the seal layer 322 can utilize the radian trend to generate the divergent effect on the light incident on the interface, and it can be understood that the radian trend of the other half of the area will generate the adverse effect on the light incident on the interface. Therefore, when the orthographic projection portion of the normal pixel region on the substrate 100 is arranged to cover the orthographic projection of the convex lens 321 on the substrate 100, a certain divergence effect can be generated on the whole light incident to the opening, and when the normal pixel region emits light, other users at a large angle position can share the display content, and the normal pixel region is brighter to open.
Preferably, the orthographic projection of the center of curvature of the convex lens 321 on the substrate 100 falls within the orthographic projection of the black matrix on the substrate 100. Wherein the center of curvature represents the intersection of the normals of two points on the arc of convex lens 321. By the arrangement, the light emitted by the normal pixel area is ensured to generate a divergence effect when entering the interface between the convex lens 321 and the seal layer 322. Fig. 5 shows that the orthographic projection of the center of curvature of the convex lens 321 on the substrate 100 is located at the boundary of the orthographic projection of the black matrix on the substrate 100.
Specifically, in order to ensure that the orthographic projection of the center of curvature of the convex lens 321 on the substrate 100 falls within the orthographic projection of the black matrix on the substrate 100, the caliber of the orthographic projection of the opening of the black matrix on the substrate 100 is larger than the caliber of the orthographic projection of the convex lens 321 on the substrate 100.
In addition, when the aperture of the orthographic projection of the opening of the black matrix on the substrate 100 is larger than the aperture of the orthographic projection of the convex lens 321 on the substrate 100, as shown with reference to fig. 3, the central portion area of the opening is not covered by the convex lens 321, and the light does not undergo the divergence of the convex lens 321 when the light is incident on this portion area. However, the light rays located in the central region of the opening in the second black matrix 313 have a small exit angle and the closer to the central position, the closer to 0 ° the exit angle, whereas the light rays at the edge region of the opening have a large exit angle and tend to diverge, and for more divergent light rays, the tendency to continue to diverge outwardly after passing through the interface is more pronounced and the effect is more pronounced. However, with this arrangement, the size of the convex lens 321 can be reduced, thereby reducing the thickness of the lens structure, so that the overall thickness of the light extraction layer is thinner.
With the above arrangement, referring to the comparison chart of fig. 6, it can be seen that the large-angle stray light in the light emitted from the peep-proof pixel area is absorbed by the first black matrix 311 and the second black matrix 313 in the optical path limiting layer 310, so as to realize small-angle emission, while the unabsorbed light in the light emitted from the normal pixel area is further dispersed by the interface refraction effect between the lens structure and the seal layer, so as to realize large-angle emission, although the large-angle stray light is absorbed by the optical path limiting layer 310, so as to limit the light angle. Therefore, the display panel provided by the embodiment of the application can realize peep-proof display and sharing display on the basis of partition driving.
In another alternative embodiment, referring to fig. 7, the display panel includes a color film sheet (CF) including a second black matrix 313 'and a color filter 330 disposed in an opening of the second black matrix 313'. That is, the color film replaces a single black matrix layer, so that the attachment of a subsequent polarizer can be omitted. Of course, as can be appreciated by those skilled in the art, the color of the color filter 330 is the same as the color of the corresponding light emitting layer, and will not be described herein.
On the other hand, considering the current privacy cut design, the size of the divided pixels in only one direction is reduced, and the pixel size of the privacy pixel area in the partition design is the same as that of the normal display, therefore, the pixel size of the privacy pixel area is larger, usually 25 μm-30 μm, and the larger the size is, the easier the light is transmitted from the pixel side wall, which is disadvantageous for the privacy display, whether w1 in fig. 1 or w2 in fig. 2. The higher the resolution of the display product is, the more the peep-proof pixel areas are distributed, and the poorer the peep-proof effect is.
In order to solve the problem, the application performs further optimized cutting on each pixel point. Referring to fig. 8, which is a schematic diagram illustrating a pixel region in a display panel of a cutting design after cutting optimization, it is understood that the cross-sectional view shown in fig. 1 or 6 can be taken along line AA' in the drawing.
It should be noted that the normal pixel area is not considered to deteriorate the display effect due to further dicing because of the divergent effect of the lens structure, and therefore, for the sake of simple process design, the same dicing can be performed for the peep-proof pixel area and the normal pixel area at the same time.
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 peep-preventing sub-pixels and at least two normal sub-pixels, the light emitting layer 201 of the normal sub-pixels is disposed in the normal pixel region, and the light emitting layer 201 of the peep-preventing sub-pixels is disposed in the peep-preventing pixel region.
Through this setting, on the basis of cutting apart the design, first subpixel, second subpixel and third subpixel all further cut apart into two at least peep-proof subpixel and normal subpixel to can be with every subpixel further cut in two directions, thereby reduce the subpixel size, reduce the possibility of following the lateral wall printing opacity, further improve peep-proof display effect.
It should be noted that, because the sizes of the peep-proof sub-pixel and the normal sub-pixel are cut down, any combination of the peep-proof pixel area and the normal pixel area can be realized, so that the total area of the peep-proof pixel area and the normal pixel area is not necessarily 1 to 1, if the application scene of the normal display mode of the display product is higher in use frequency, the proportion of the normal sub-pixel is increased, and if the application scene of the peep-proof display mode is higher in use frequency, the proportion of the peep-proof sub-pixel is increased. For example, referring to fig. 9, the number of normal subpixels in the normal pixel area is set to 3:1 with respect to the peep-preventing subpixels. Of course, the specific proportions are not limiting and will not be described in detail herein.
Specifically, since the further cutting design is implemented on the basis of the same sub-pixel, i.e. the split peep-proof sub-pixel can be controlled in the same driving manner, and the normal sub-pixel is also controlled in the same driving manner, the split can be performed by patterning the pixel defining layer. That is, in each pixel unit, the peep-proof 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 the 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 defining layer and has the common anode 203.
Patterning of the pixel defining layer may be made small in size compared to patterning the anode by metal sputtering. Preferably, the size of the peep-proof sub-pixel and the normal sub-pixel may be 5 μm or more and 10 μm or less by means of the material characteristics of the pixel defining layer.
Corresponding to the peep-proof display panel, the embodiment of the application also provides a method for manufacturing the peep-proof display panel, which comprises the following steps:
A substrate base plate is provided,
Forming a light emitting unit layer on a 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 region and a peep-proof pixel region,
A light extraction layer is formed on the light emitting cell layer,
The light extraction layer comprises a light path limiting layer and a light emergent layer arranged on the light path limiting layer,
Wherein the light path limiting layer comprises at least one layer of black matrix, the black matrix comprises a plurality of openings, the orthographic projection of the black matrix on the substrate covers the orthographic projection of the pixel defining layer on the substrate,
The light-emitting layer comprises a lens structure and a sealing layer covering the lens structure, wherein the lens structure comprises a plurality of convex lenses, and the orthographic projection part of the normal pixel area on the substrate covers the orthographic projection of the convex lenses on the substrate, and the refractive index of the lens structure is larger than that of the sealing layer.
Forming the light extraction layer on the light emitting cell layer further 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 gray mask to form a lens structure, forming a sealing layer on the light path limiting layer to form a light extraction layer,
Or alternatively
The light extraction method includes forming a light-emitting unit layer, forming a light-path limiting layer on the light-emitting unit layer, forming a first material layer on the light-path limiting layer, molding the first material layer by a molding method to form a lens structure, and forming an encapsulation layer on the light-path limiting layer to form a light extraction layer.
In this embodiment, by forming the light extraction layer on the light emitting layer, the light extraction layer includes the light path limiting layer and the light emitting layer, and the light path limiting layer includes the black matrix, the light emitting layer includes the lens structure and the seal layer, the lens structure corresponds with the normal pixel area, the light is ensured to exit at a small angle through the light path limiting layer, and the interface between the lens structure and the seal layer diverges the light of the normal pixel area, the overall peep-proof film layer is small in thickness, simple in structure and simple in process flow, and has wide application prospects.
Next, a specific manufacturing process will be described by taking the display panel shown in fig. 1 as an example with reference to fig. 10 to 13.
Referring to fig. 10, in step S1, a driving circuit layer 700 is formed on a substrate, a light emitting unit layer 200 is formed on the driving circuit layer 700, and a thin film encapsulation layer (TFE) 400 is formed on the light emitting unit layer 200.
Specifically, the substrate 100 may be a glass substrate or a flexible material. The flexible material comprises Polyimide (PI), PEN, PET and the like. The flexible substrate may be a single layer structure or a plurality of layers. In the case of a multilayer structure, a buffer layer may be added from layer to layer. The buffer layer is an inorganic thin film and can be SiNx, siOx or a composite layer thereof.
The driving circuit layer 700 is formed on the substrate 100, and the buffer layer 600 is formed before the driving circuit layer is formed.
The driving circuit layer 700 includes a thin film transistor. The thin film transistor includes an active layer 701, a gate insulating layer 702, a gate 703, a dielectric layer 704, and a source/drain electrode 705.
The active layer 701 is a Poly polysilicon layer, the material of the gate insulating layer 702 may be silicon oxide, silicon nitride, or other inorganic insulating materials such as silicon oxynitride, and the gate insulating layer 702 may have one or more layers. The material of the gate 703 may also be a multi-layer metal structure, and the film combination may be one or a stack 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). The dielectric layer 704 is then formed with a via hole, and the source/drain electrode 705 is formed by magnetron sputtering a metal layer, wherein the film layer combination of the source/drain electrode 705 may be one or a stack of Mo/Al/Mo, mo/Cu, moNb/Cu/MoTi, etc.
After forming the thin film transistor, a planarization layer 800 may be deposited, and then, a light emitting layer 300 is formed on the planarization layer 800.
Specifically, the anode 202, the pixel defining layer 203, the light emitting layer 201, the cathode, and the like are fabricated. The light emitting layer 201 including not only a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and the like, and a cathode (not shown) may be formed using a vacuum evaporation process. In addition, although not shown, support column structures, retaining wall structures, etc. may be fabricated. The pixel defining layer 203, the supporting columns, and the retaining walls are made of the same material as the planarization layer 800, and are all organic insulating materials, and can be made of polyimide photoresist. The isolation column is mainly arranged in the display area, and the retaining wall structure is located in the unrealistic area. The barrier wall may be formed of one or more of the planarization layer 800, the pixel defining layer 203, and the isolation pillar layer.
Thereafter, a thin film encapsulation layer 400 is formed on the light emitting cell layer 200, the thin film encapsulation layer 400 including an inorganic thin film layer blocking water and oxygen and an organic layer functioning as stress release and planarization. The inorganic layer is prepared by chemical vapor deposition or atomic layer deposition, and the material may be silicon nitride, silicon oxide, silicon oxynitride, aluminum oxide, titanium oxide, etc., but is not limited thereto. The organic layer is prepared by using methods of ink-jet printing, screen printing, dispensing and the like. First a first inorganic layer is deposited over the sub-pixels (i.e. the light emitting device), which may be one or a plurality of overlapping combinations of the aforementioned materials. The protection area of the inorganic layer is larger than the display area of the display area, and generally, the vertical projection of the coverage area is outside the retaining wall. The first organic layer is prepared on the first inorganic layer, the coverage area of the first organic layer is smaller than that of the inorganic layer, and the vertical projection of the coverage area is at least larger than that of the cathode. And manufacturing a second inorganic layer on the first organic layer, wherein the manufacturing method and the materials of the second inorganic layer are the same as those of the first inorganic layer, and the coverage area of the second inorganic layer can be the same as that of the first inorganic layer or larger than that of the first inorganic layer. Likewise, the composition may be one inorganic material or a combination of the aforementioned inorganic layers.
In step S2, referring to fig. 11, if the display panel is an integrated touch display panel, the touch layer 500 is formed on the thin film encapsulation layer 400, and the first black matrix 311 is formed on the touch layer 500. The specific process may be to deposit a black matrix material layer after the touch layer 500 is formed on the thin film encapsulation layer 400, and pattern the black matrix material layer through exposure, development, and baking curing processes to form the first black matrix 311.
In step S3, referring to fig. 12, a dielectric layer 312 is formed on the first black matrix 311 by an inkjet printing process, and a second black matrix 313 is formed on the dielectric layer 312 to form the optical path limiting layer 310. The specific process is similar to the process of forming the first black matrix 311, and will not be described herein.
In step S4, as shown with reference to fig. 13, a lens structure is formed on the second black matrix 313. The method specifically comprises the steps of forming a first material layer on the second black matrix 313, patterning the first material layer by using a gray mask plate to form the lens structure, or forming the first material layer on the second black matrix 313, and stamping the first material layer by using a stamping method to form the lens structure.
By the arrangement, the lens structure with a plurality of convex lenses can be formed by using the process characteristics of patterning by using a gray scale mask or the process characteristics of patterning by using a stamping method, so that the structure of the embodiment of the application is realized by simple process steps.
An encapsulant layer 322 is then formed over 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 film, a polarizer may be attached later, which is not described herein.
Based on the same inventive concept, the embodiment of the application also provides a peep-proof display device, which comprises the peep-proof display panel described in the above embodiment. Since the peep-proof display panel included in the peep-proof display device provided by the embodiment of the present application corresponds to the peep-proof display panel provided by the above embodiment, the foregoing embodiment is also applicable to the peep-proof display device provided by the embodiment, and will not be described in detail in the embodiment.
In this embodiment, the peep-proof display device may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, or a navigator.
Aiming at the existing problems at present, the application designs a peep-proof display panel, a peep-proof display device and a manufacturing method, and provides a light extraction layer on a light-emitting layer, wherein the light extraction layer comprises a light path limiting layer and a light-emitting layer, the light path limiting layer comprises a black matrix, the light-emitting layer comprises a lens structure and a sealing layer, the lens structure corresponds to a normal pixel area, the light is emitted at a small angle through the light path limiting layer, the interface between the lens structure and the sealing layer diverges the light of the normal pixel area, and the whole peep-proof film has small thickness, simple structure and simple process flow and wide application prospect.
It should be understood that the foregoing examples of the present application are provided merely for clearly illustrating the present application and are not intended to limit the embodiments of the present application, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present application as defined by the appended claims.