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

Abstract

The application discloses a display panel, a manufacturing method of the display panel, and a display device. The display panel comprises a substrate, a light-emitting layer, and a first optical structure layer. The first optical structure layer overlaps the projection of the substrate and the projection of a light-emitting device on the substrate. The light-emitting layer comprises the light-emitting device. The side of the light-emitting device away from the substrate is a concave surface. Thus, the light-emitting device is equivalent to a concave mirror, and the light emitted by the light-emitting device is convergent light. The side of the first optical structure layer away from the substrate is a first convex surface. Thus, the first optical structure layer is equivalent to a convex lens. At this time, the first optical structure layer can adjust the convergent light emitted by the light-emitting device to be small-view-angle light. That is, through the cooperation of the light-emitting device with the concave mirror function and the first optical structure layer with the convex lens function, the display panel can reduce the emission of large-view-angle light and improve the emission of small-view-angle light, thereby realizing the anti-peeping display and protecting the information displayed by the electronic device.

Description

Technical Field

[0001] This application relates to the field of display panels, and more particularly to a display panel, a method for manufacturing a display panel, and a display device. Background Technology

[0002] Current display technology is mainly divided into liquid crystal displays (LCDs), organic light-emitting diode (OLEDs), and micro-LEDs. LCDs offer advantages such as thinness, energy efficiency, and no radiation, and are widely used in various electronic devices. OLEDs utilize the recombination of electrons and holes in organic materials to emit light and achieve different colors. OLEDs are self-emissive devices with advantages such as fast response time, high brightness, wide viewing angle, and low power consumption.

[0003] With the rapid development of display technology, higher demands are being placed on the displays of electronic devices. Especially for different application scenarios, electronic devices have different display requirements. For example, in more privacy-sensitive applications, users want to protect the information displayed on their electronic devices. Summary of the Invention

[0004] To address the aforementioned issues, this application provides a display panel, a method for manufacturing the display panel, and a display device, which can achieve privacy protection and safeguard the information displayed on electronic devices.

[0005] In a first aspect, this application provides a display panel, including:

[0006] substrate;

[0007] A light-emitting layer is located on one side of the substrate. The light-emitting layer includes a light-emitting device, and the side of the light-emitting device away from the substrate is a recessed surface.

[0008] A first optical structure layer is located on the side of the light-emitting layer away from the substrate; the projection of the first optical structure layer on the substrate and the projection of the light-emitting device on the substrate overlap, and the side of the first optical structure layer away from the substrate is a first raised surface; the first optical structure layer is used to adjust the converging light emitted by the light-emitting device into a small-angle light emission.

[0009] In one possible implementation, the distance between the focal point of the light-emitting device and the focal point of the first optical structure layer on the side closer to the substrate, along a direction perpendicular to the plane of the substrate, is less than a target threshold.

[0010] In one possible implementation, the side of the first optical structure layer closest to the substrate is a plane, and along a direction perpendicular to the plane of the substrate, the maximum thickness of the first optical structure layer ranges from [2μm, 8μm].

[0011] In one possible implementation, the focal point of the light-emitting device coincides with the focal point of the first optical structure layer on the side closer to the substrate.

[0012] In one possible implementation, the side of the first optical structure layer closest to the substrate is a second raised surface, and the raised direction of the second raised surface is opposite to the raised direction of the first raised surface.

[0013] In one possible implementation, the second protruding surface and the first protruding surface are arranged axially symmetrically.

[0014] It also includes a touch layer disposed between the first optical structure layer and the light-emitting layer. The touch layer includes a first groove, the first optical structure layer is disposed in the first groove, and the second raised surface and the first raised surface are symmetrical about the interface between the first optical structure layer and the touch layer.

[0015] In one possible implementation, a second optical structure layer is further included, which covers the first optical structure layer, wherein the refractive index of the first optical structure layer is greater than that of the second optical structure layer.

[0016] In one possible implementation, the recessed surface and the first raised surface are curved surfaces.

[0017] In one possible implementation, the side of the light-emitting device closest to the substrate has a recessed surface.

[0018] In one possible implementation, a pixel definition layer is further included, the pixel definition layer including a pixel opening corresponding to the light-emitting device, and the projection of the light-emitting device on the pixel definition layer is located within the pixel opening.

[0019] In one possible implementation, the minimum boundary distance between the projection of the first optical structure layer onto the pixel definition layer and the pixel opening is in the range of [-0.5μm, 2μm], wherein the minimum boundary distance is positive in the direction in which the light-emitting device faces the pixel definition layer and is parallel to the surface of the substrate.

[0020] In one possible implementation, a light-emitting blocking layer is also included, which includes a light-emitting opening and is used to block light rays from escaping at a wide angle.

[0021] In one possible implementation, a pixel definition layer is further included, which includes a pixel opening corresponding to the light-emitting device, wherein the projection size of the light-emitting opening on the pixel definition layer is larger than the size of the pixel opening.

[0022] In one possible implementation, a planarization layer is also included, the planarization layer comprising a plurality of second grooves, in which the light-emitting device is disposed.

[0023] In this application, the display panel achieves privacy protection by using a light-emitting device with concave mirror function and a first optical structure layer with convex lens function in cooperation, and by setting a light-blocking layer to reduce the emission of light from the display panel from a wide viewing angle and increase the emission of light from a narrow viewing angle.

[0024] Secondly, this application provides a method for manufacturing a display panel, comprising:

[0025] A planarization layer is formed on the substrate;

[0026] The planarization layer is photolithographically etched using a semi-transparent mask to obtain multiple second grooves;

[0027] A light-emitting layer is formed, the light-emitting layer including a light-emitting device, the light-emitting device being disposed in the second groove, and the side of the light-emitting device away from the substrate being a recessed surface;

[0028] A first optical structure layer is formed on the side of the light-emitting layer away from the substrate using a photolithography process. The projection of the first optical structure layer on the substrate and the projection of the light-emitting device on the substrate overlap. The side of the first optical structure layer away from the substrate is a first raised surface. The first optical structure layer is used to adjust the converging light emitted by the light-emitting device into a small-angle light emission.

[0029] In one possible implementation, the method further includes:

[0030] A touch layer is formed on the side of the light-emitting layer away from the substrate;

[0031] The touch layer is photolithographically etched using a semi-transparent mask to obtain multiple first grooves;

[0032] The process of forming a first optical structure layer on the side of the light-emitting layer away from the substrate using photolithography includes:

[0033] A high-refractive-index film layer is formed, which fills the first groove and covers the touch layer. The high-refractive-index film layer is etched using a photolithography process to form a first optical structure layer on the side of the touch layer away from the substrate. The first optical structure layer is disposed in the first groove. The side of the first optical structure layer near the substrate is a second raised surface, and the raised direction of the second raised surface is opposite to the raised direction of the first raised surface.

[0034] In one possible implementation, the method further includes:

[0035] A second optical structure layer is formed, which covers the first optical structure layer, and the refractive index of the first optical structure layer is greater than that of the second optical structure layer.

[0036] In one possible implementation, the method further includes:

[0037] A light-emitting blocking layer is formed, and the light-emitting blocking layer is etched to form a light-emitting opening.

[0038] In this application, the first and second grooves are formed by using a semi-transparent mask template, which simplifies the manufacturing process.

[0039] Thirdly, this application provides a display device, which includes the display panel described above.

[0040] This application provides a display panel comprising a substrate, a light-emitting layer, and a first optical structure layer. The light-emitting layer is located on one side of the substrate, and the first optical structure layer is located on the side of the light-emitting layer away from the substrate. The projection of the first optical structure layer onto the substrate and the projection of the light-emitting device onto the substrate overlap, meaning that light emitted from the light-emitting layer passes through the first optical structure layer before exiting. The light-emitting layer includes a light-emitting device for emitting light. The side of the light-emitting device away from the substrate is a concave surface, thus the light-emitting device acts as a concave mirror. The focal point of the concave mirror is located on the side of the light-emitting layer facing the first optical structure layer, thus the light emitted by the light-emitting device is converging light. The side of the first optical structure layer away from the substrate is a first convex surface, thus the first optical structure layer acts as a convex lens. The focal point of the convex lens is located on the side of the first optical structure layer facing the light-emitting layer. In this case, the first optical structure layer can adjust the converging light emitted by the light-emitting device into a narrow-angle light emission. That is, through the cooperation of the light-emitting device with concave mirror function and the first optical structure layer with convex lens function, the emission of light with a wide angle of view from the display panel is reduced, and the emission of light with a narrow angle of view is increased, thereby achieving privacy protection and protecting the information displayed on the electronic device. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the viewing angle of a display panel;

[0042] Figure 2 This is a top view of a display panel provided in an embodiment of this application;

[0043] Figure 3 The embodiments of this application are shown along Figure 2 A schematic diagram of the cross-sectional structure along the BB direction is shown.

[0044] Figure 4 A schematic cross-sectional view of another display panel provided in an embodiment of this application is shown;

[0045] Figure 5 A cross-sectional structural schematic diagram of another display panel provided in an embodiment of this application is shown;

[0046] Figure 6 A cross-sectional structural schematic diagram of another display panel provided in an embodiment of this application is shown;

[0047] Figure 7 A schematic flowchart of a method for manufacturing a display panel according to an embodiment of this application is shown;

[0048] Figure 8 A top view of a display device provided in an embodiment of this application is shown. Detailed Implementation

[0049] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0050] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0051] Secondly, this application provides a detailed description in conjunction with schematic diagrams. When detailing the embodiments of this application, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this application. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0052] In practical applications, light emitted from a display panel includes both wide-viewing-angle light and narrow-viewing-angle light, defined based on the orthographic viewing angle. The orthographic viewing angle of a display panel refers to the angle between the user's line of sight and the display panel when the user is looking at the panel, or the angle between the user's line of sight and the direction perpendicular to the display panel does not exceed 5°. Referring to Figure 1, it can be seen that the user's line of sight is perpendicular to the display panel, or the angle between the user's line of sight and the direction perpendicular to the display panel does not exceed 5°. Narrow-viewing-angle light refers to the angle between the light emitted from the display panel and the direction perpendicular to the display panel, ranging from 0° to 50°. Wide-viewing-angle light refers to the angle between the light emitted from the display panel and the direction perpendicular to the display panel, ranging from 50° to 90°. Typically, privacy displays aim to reduce wide-viewing-angle light and increase narrow-viewing-angle light; ideally, the light emitted from the display panel should be visible only from an orthographic viewing angle, and not from any other angle.

[0053] Currently, privacy screens can be achieved by using a louver array film (LAF) in the display panel of electronic devices. However, the louver array film consists of multiple layers, including the louver structure, protective layer, and adhesive material. The thickness of the louver array film is usually quite thick, ranging from 200um to 400um. Therefore, it cannot meet the requirements for thinness of electronic devices or display panels. In other words, the current louver array film cannot be applied to thin products, such as organic light-emitting display panels.

[0054] The venetian blind structure in the venetian blind array film mainly plays the role of controlling the viewing angle, thereby achieving privacy display. The thickness of the venetian blind structure is only 100um, but the venetian blind structure has a complex structure. Current technology cannot directly apply the venetian blind structure to thin products.

[0055] Based on this, this application provides a display panel that, through the cooperation of a light-emitting device with concave mirror function and a first optical structure layer with convex lens function, reduces the emission of light from the display panel at wide viewing angles and increases the emission of light at narrow viewing angles, thereby achieving privacy display and protecting the information displayed on electronic devices. This achieves privacy display without the need for an additional thick venetian blind array film and is adaptable to thinner products.

[0056] To better understand the technical solution and effects of this application, the specific embodiments will be described in detail below with reference to the accompanying drawings.

[0057] refer to Figure 2 The diagram shown is a top view of a display panel provided in an embodiment of this application. Figure 3 It is along Figure 2A schematic diagram of the cross-sectional structure of the display panel taken from the direction where BB is located.

[0058] The display panel 100 provided in this application embodiment can be a rigid display panel or a flexible display panel. A rigid display panel is hard and not easily bent or folded, while a flexible display panel is flexible and can be easily bent, folded, or rolled up. For example, the display panel 100 can be a foldable display panel that can be folded and unfolded, a curved display panel with a curved display surface, a curved display panel with an area other than the curved display surface, a rollable display panel that can be rolled up and / or unfolded, or a stretchable display panel that can be stretched and / or not stretched, etc.

[0059] refer to Figure 2 As shown, the display panel 100 provided in this embodiment includes a display area AA and a non-display area NA, with the non-display area NA surrounding the display area AA. The display area AA is the area used for display, and the non-display area NA is the area used to set up the circuit structure that drives the display panel 100 to display. The display area AA can occupy most of the area of ​​the display panel 100, and the display area AA can be located at the center of the display panel 100, such as the central area. The non-display area NA is the area outside the display area AA, and the non-display area NA can be defined as the edge area of ​​the display panel 100, such as the peripheral area.

[0060] In some embodiments, the non-display area NA includes a first non-display area NA1 and a second non-display area NA2, and the display area AA surrounds the first non-display area NA1. The first non-display area NA1 may be a camera area, an area used to set up a camera, and the second non-display area NA2 may be, for example, a border area.

[0061] The display panel 100 provided in this application embodiment includes a substrate 110. The substrate 110 may include an insulating material (e.g., it may be made of an insulating material), which may be glass, quartz, or polymer resin. The substrate 110 may be a flexible substrate that can be bent, folded, and / or rolled. As an example, the substrate 110 may include polyimide.

[0062] In one embodiment, substrate 110 may include a first substrate, a second substrate, and an inorganic barrier layer. Each of the first and second substrates may include a polymer resin, such as at least one selected from polyethersulfone, polyacrylate, polyetherimide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, polyimide, polycarbonate, or cellulose acetate propionate. The first and second substrates may be made of the same material or different materials. The structure of substrate 110, including the polymer resin and the inorganic barrier layer, allows the display panel to be bent, folded, and / or rolled. It also enhances the flatness and temperature stability of substrate 110, facilitating the subsequent fabrication of other film layers on its surface and enabling it to withstand subsequent processing. Furthermore, it reduces the risk of film peeling during bending of the display panel and blocks the influence of mobile charges on the thin-film transistor channels, thereby improving display quality.

[0063] The display panel 100 provided in this embodiment includes a light-emitting layer disposed on one side of a substrate 110. The light-emitting layer includes at least one light-emitting device 120, which can be a semiconductor device capable of emitting light of different colors, with different colors corresponding to different emission wavelengths. For example, the light-emitting device 120 can be a red light-emitting device capable of emitting red light, a green light-emitting device capable of emitting green light, and a blue light-emitting device capable of emitting blue light. Exemplarily, this embodiment may select an organic light-emitting diode (OLED) as the light-emitting device, or it may use a quantum light-emitting diode (QLED).

[0064] In the embodiments of this application, the side of the light-emitting device 120 away from the substrate 110 can be a recessed surface, as shown in the reference. Figure 3 As shown, the concave direction of the concave surface is towards the substrate 110. That is, the distance between the side of the light-emitting device 120 away from the substrate 110 and the substrate 110 shows a trend of decreasing and then gradually increasing. In this way, the light-emitting device 120 is equivalent to a concave mirror. The focal point of the concave mirror is located on the side of the light-emitting layer away from the substrate 110. Thus, the light emitted by the light-emitting device 120 is a converging light.

[0065] The shape of the side of the light-emitting device 120 closest to the substrate 110 does not affect the fact that the light emitted by the light-emitting device 120 is a converging light.

[0066] In one embodiment, the side of the light-emitting device 120 closest to the substrate 110 can be a plane parallel to the plane on which the substrate 110 is located.

[0067] In another embodiment, the side of the light-emitting device 120 closest to the substrate 110 can also be a recessed surface. That is, both sides of the light-emitting device 120 are recessed surfaces, and the recessed direction is towards the substrate 110. The structure of the light-emitting device 120 with recessed surfaces on both sides is relatively easy to manufacture.

[0068] In some embodiments, the light-emitting device 120 may include an anode metal layer 121, an organic light-emitting layer 122, and a cathode metal layer (not shown). The organic light-emitting layer 122 is used to emit light of different colors.

[0069] It is understood that, in addition to the anode metal layer 121, the organic light-emitting layer 122, and the cathode metal layer, the light-emitting device 120 may also include a common layer of organic materials, such as a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer.

[0070] In the actual manufacturing of the multiple film layers of the light-emitting device 120, the curvature control of different film layers is specifically designed according to the actual light emission situation.

[0071] The display panel 100 provided in this application embodiment includes a first optical structure layer 130 located on the side of the light-emitting layer away from the substrate 110. The projection of the first optical structure layer 130 onto the substrate 110 overlaps with the projection of the light-emitting device 120 onto the substrate 110, so that light emitted from the light-emitting layer passes through the first optical structure layer 130 before exiting. The overlap of the projection of the first optical structure layer 130 onto the substrate 110 and the projection of the light-emitting device 120 onto the substrate 110 refers to orthographic projection overlap.

[0072] In the embodiments of this application, the side of the first optical structure layer 130 away from the substrate 110 is a first raised surface, and the raised direction of the first raised surface is away from the substrate 110. That is to say, the distance between the side of the first optical structure layer 130 away from the substrate 110 and the substrate 110 shows a trend of increasing from small to large and then gradually decreasing. In this way, the first optical structure layer 130 is equivalent to a convex lens. The focal point of the convex lens is located on the side of the first optical structure layer 130 facing the light-emitting layer. According to the characteristic of the convex lens that it can adjust the converging light rays into parallel light rays, the first optical structure layer 130 can adjust the converging light rays emitted by the light-emitting device 120 into small-angle light rays.

[0073] In other words, by the cooperation of the light-emitting device 120 with the function of a concave mirror and the first optical structure layer 130 with the function of a convex lens, the emission of light from the display panel at a wide viewing angle can be reduced, while the emission of light at a narrow viewing angle can be increased, thereby achieving privacy display and protecting the information displayed on the electronic device.

[0074] In the embodiments of this application, in order for the first optical structure layer 130 to adjust the converging light emitted by the light-emitting device 120 into a narrow-angle light emission, the focal point of the light-emitting device 120 and the focal point of the first optical structure layer 130 cannot be too far apart; otherwise, the light adjustment function may not be achieved. Since the first optical structure layer 130 has the function of a convex lens, it has two focal points. In the embodiments of this application, the focal point refers to the focal point of the first optical structure layer 130 on the side closer to the substrate 110.

[0075] In some embodiments, along a direction perpendicular to the plane of the substrate 110, the distance between the focal point of the light-emitting device 120 and the focal point of the first optical structure layer 130 near the substrate 110 is less than a target threshold. The target threshold is determined based on the curvature of the light-emitting device 120 and the first optical structure layer 130.

[0076] In one embodiment, the focal point of the light-emitting device 120 coincides with the focal point of the first optical structure layer 130 on the side near the substrate 120. In this way, the converging light emitted by the light-emitting device 120 converges at the focal point of the light-emitting device 120, and then the converging light is also at the focal point of the first optical structure layer 130. It is directly adjusted by the first optical structure layer 130 to be emitted as parallel light. In this way, all the light emitted by the light-emitting device 120 is emitted as small-angle light, which greatly improves the emission of small-angle light and reduces the emission of large-angle light, thereby achieving a better privacy protection effect.

[0077] In some embodiments, the shape of the side of the first optical structure layer 130 near the substrate 110 does not affect the characteristic of the first optical structure layer 130 having a convex lens.

[0078] In one embodiment, the side of the first optical structure layer 130 near the substrate 110 can be a plane parallel to the plane of the substrate 110, so that the first optical structure layer 130 forms a plano-convex lens, and the first optical structure layer 130 is easier to manufacture.

[0079] As an example, along the direction perpendicular to the plane of the substrate 110, the maximum thickness of the first optical structure layer 130 ranges from [2μm, 8μm]. This means the maximum distance between the first optical structure layer 130 and its underlying film layer varies between 2μm and 8μm, providing a wider range of structural design scenarios for the first optical structure layer 130. Thus, after obtaining the maximum length of the first optical structure layer 130 in the direction parallel to the plane of the substrate 110, the curvature of the first optical structure layer 130 can be obtained.

[0080] In another embodiment, the side of the first optical structure layer 130 closest to the substrate 110 is a second raised surface. The raised direction of the second raised surface is opposite to that of the first raised surface. That is, the raised direction of the second raised surface is closer to the substrate 110, so that the first optical structure layer 130 constitutes a biconvex lens.

[0081] It should be noted that the first and second convex surfaces can be arranged symmetrically or asymmetrically. The first optical structure 130 obtained by symmetrical arrangement has the best privacy protection effect. Compared with the first optical structure layer 130 of a plano-convex lens, the first optical structure layer 130 of a biconvex lens can reduce imaging aberrations and has a shorter focal length. At the same focal length, the first optical structure layer 130 of the biconvex lens has a larger radius of curvature. Correspondingly, the first optical structure layer 130 of the biconvex lens is larger in size, has greater light throughput, and higher image quality.

[0082] In some embodiments, the concave surface, the first convex surface, and the second convex surface are curved surfaces, which can achieve a clearer focus and thus improve the control of the direction of light.

[0083] The display panel 100 provided in this application embodiment may further include a driving circuit layer (not shown), a planarization layer 140, a pixel definition layer 150, an encapsulation layer 160, a touch layer 170, and a second optical structure layer 180, wherein the planarization layer 140, the light-emitting layer, the pixel definition layer 150, the encapsulation layer 160, the touch layer 170, the first optical structure layer 130, and the second optical structure layer 180 are stacked sequentially.

[0084] Multiple driving transistors can be disposed in the driving circuit layer. The driving circuit layer includes an active layer, a first metal layer, a second metal layer, and an insulating layer between adjacent conductive layers, such as a buffer layer, a gate insulating layer, a first inter-layer insulating layer, and a second inter-layer insulating layer. The driving circuit layer may also include a third metal layer and a fourth metal layer, and an insulating layer between them, which are not shown in the figure. Specifically, the channel of the driving transistor is located in the active layer, the gate of the driving transistor is located in the first metal layer, and the source and drain electrodes of the driving transistor are located in the second metal layer.

[0085] A planarization layer 140 covers the driving circuit layer to provide a flat surface for mounting the light-emitting device 120. The planarization layer 140 may be an organic material, such as acrylic, benzocyclobutene, hexamethyldisiloxane, or a combination thereof. The planarization layer 140 includes a plurality of second grooves in which the light-emitting device 120 is disposed. The shape of the second grooves is determined based on the shape of the side of the light-emitting device 120 closest to the substrate 110.

[0086] In one embodiment, the side of the light-emitting device 120 closest to the substrate 110 is a plane parallel to the plane on which the substrate 110 is located. In this case, the bottom of the second groove can be set as a plane parallel to the plane on which the substrate 110 is located, so that the light-emitting device 120 can be disposed in the second groove.

[0087] In another embodiment, the side of the light-emitting device 120 closest to the substrate 110 is a recessed surface. In this case, the bottom of the second groove can also be configured as a recessed surface facing the substrate 110, so that the light-emitting device 120 can be disposed in the second groove. The second groove with the recessed surface can be obtained by photolithography using a half-tone mask. Photolithography using a half-tone mask reduces the light transmittance of the opening portion of the mask, thereby reducing the exposure received by the photoresist and achieving etching at different heights.

[0088] The planarization layer 140 can be relatively thick, for example, 2.8 μm. This can reduce the coupling capacitance between the data traces and the anode metal layer 121 or the cathode metal layer, and also provide enough space to form a second groove.

[0089] It should be noted that, in Figure 3 The planarization layer 140 is illustrated as a single layer, but in other embodiments, the planarization layer 140 may have a multi-layer structure.

[0090] A pixel definition layer 150 is disposed on the surface of the planarization layer 140. The pixel definition layer 150 has multiple pixel openings. Each pixel opening exposes a corresponding light-emitting device 120, meaning that there is a one-to-one correspondence between the light-emitting device 120 and the pixel opening, and the projection of the light-emitting device 120 onto the pixel definition layer 150 is located within the pixel opening.

[0091] In some embodiments, the length of the pixel aperture and the length of the first optical structure layer 130 are related. The positive direction is defined as the direction from the light-emitting device 120 toward the pixel definition layer 150 and parallel to the surface of the substrate 110; that is, the positive direction is the direction from the display area AA toward the non-display area NA, and the negative direction is the direction from the non-display area NA toward the display area AA. The minimum boundary distance between the projection of the first optical structure layer 130 onto the pixel definition layer 150 and the same side of the pixel aperture is S, where S ranges from -0.5 μm to 2 μm. In other words, the length of the first optical structure layer 130 can be greater than the length of the pixel aperture, with the length difference being the sum of the minimum boundary distances on both sides. Therefore, the length of the first optical structure layer 130 can be greater than the length of the pixel aperture by a maximum of 4 μm. Conversely, the length of the first optical structure layer 130 can be less than the length of the pixel aperture, with the length difference being the sum of the minimum boundary distances on both sides. Therefore, the length of the first optical structure layer 130 can be less than the length of the pixel aperture by a maximum of 1 μm.

[0092] The encapsulation layer 160 includes at least one inorganic encapsulation layer and at least one organic encapsulation layer. Figure 3 The encapsulation layer 160 shown includes a first inorganic encapsulation layer 161, a second inorganic encapsulation layer 163, and an organic encapsulation layer 162 disposed between the first inorganic encapsulation layer 161 and the second inorganic encapsulation layer 163. The first inorganic encapsulation layer 161 and the second inorganic encapsulation layer 163 may include at least one inorganic material, such as alumina, titanium oxide, tantalum oxide, hafnium oxide, zinc oxide, silicon oxide, silicon nitride, and silicon oxynitride. The organic encapsulation layer 162 may include monomeric organic materials or polymeric materials (i.e., organic encapsulation materials). Examples of polymeric materials may include acrylic resins, epoxy resins, polyimide, and polyethylene. The encapsulation layer 160 is used to protect the underlying light-emitting device 120 or driving transistor from moisture or oxygen in the air.

[0093] The touch layer 170 is located on the side of the encapsulation layer 160 away from the substrate 110. The touch layer 170 includes a touch insulating layer and touch electrodes. The touch electrodes can be disposed in the touch insulating layer for receiving user touch signals. The touch electrodes include a first touch electrode and a second touch electrode. When the first touch electrode is a sensing electrode, the second touch electrode is a driving electrode; when the first touch electrode is a driving electrode, the second touch electrode is a sensing electrode. Touch detection based on the mutual capacitance principle is achieved through the first and second touch electrodes. The touch electrodes can be made of materials with good conductivity, including any one or more of the following metallic materials: molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and their alloys (e.g., made from any one or more of these materials) in single or multiple layers.

[0094] In some embodiments, the shape of the touch layer 170 on the side away from the substrate 110 is determined according to the shape of the first optical structure layer 130 on the side close to the substrate 110.

[0095] In one embodiment, the side of the first optical structure layer 130 closest to the substrate 110 is a plane parallel to the plane of the substrate 110, and the side of the touch layer 170 furthest from the substrate 110 is also a plane parallel to the plane of the substrate 110. (Refer to...) Figure 3 As shown.

[0096] In another embodiment, if the side of the first optical structure layer 130 near the substrate 110 is a second raised surface, then the touch layer 170 includes at least one first groove, and the first optical structure layer 130 is disposed in the first groove. The shape of the first groove is determined according to the shape of the side of the first optical structure layer 130 near the substrate 110. That is, the bottom of the first groove is a recessed surface, and the recessed direction of the recessed surface is the same as the raised direction of the second raised surface, so that the first optical structure layer 130 can be disposed in the first groove. The first groove with the recessed surface can be obtained by photolithography using a half-tone mask.

[0097] As an example, if the second raised surface and the first raised surface are arranged axially symmetrically, then the axis of symmetry between the second raised surface and the first raised surface is the interface between the first optical structure layer 130 and the touch layer 170, as shown in the reference. Figure 4 As shown.

[0098] The second optical structure layer 180 covers the first optical structure layer 130. The refractive index of the first optical structure layer 130 is greater than that of the second optical structure layer 180. Thus, light emitted from the light-emitting device 120, after being refracted by the first optical structure layer 130, continues to exit through the second optical structure layer 180. This means that small-angle light emission can be achieved by utilizing the refraction between the first and second optical structure layers 130 and 180. The thickness of the second optical structure layer 180 is in the range of [8μm, 20μm]. The second optical structure layer 180 can be formed using inkjet printing.

[0099] As an example, the refractive index of the first optical structural layer 130 can be in the range of 1.56-1.8, and the refractive index of the second optical structural layer 180 can be in the range of 1.4-1.55.

[0100] The display panel 100 provided in this embodiment may further include a light-emitting barrier layer 190, see reference. Figure 5 and Figure 6 As shown. The light-emitting blocking layer 190 includes a light-emitting opening for light to escape from a small viewing angle, and the light-emitting blocking layer 190 is used to block light to escape from a large viewing angle. The light-emitting blocking layer 190 can be a black matrix.

[0101] As an example, the thickness of the light-emitting blocking layer 190 can be in the range of [0.5 μm, 5 μm]. The slope angle of the light-emitting blocking layer 190 is in the range of [30°, 85°], where the slope angle refers to the angle between the sidewall of the light-emitting blocking layer 190 and the surface of the second optical structure layer 180.

[0102] In some embodiments, the projection size of the light-emitting opening on the pixel definition layer 150 is greater than or equal to the size of the pixel opening, thereby preventing light from being blocked by the light-emitting blocking layer 190 at small viewing angles.

[0103] The display panel 100 provided in this embodiment may further include an optical adhesive layer 191, see reference. Figure 5 As shown, the optical adhesive layer 191 is used to cover the light-emitting blocking layer 190 to achieve planarization. The thickness of the optical adhesive layer 191 can be in the range of [2μm, 6μm].

[0104] The display panel 100 provided in this application embodiment may also include other film layers, such as polarizers or glass covers.

[0105] Therefore, the display panel provided in this application embodiment achieves privacy display and protects the information displayed by the electronic device by the cooperation of the light-emitting device with concave mirror function and the first optical structure layer with convex lens function, and by setting a light-blocking layer to reduce the emission of light from the display panel from a wide viewing angle and increase the emission of light from a narrow viewing angle.

[0106] Based on the display panel provided in the above embodiments, this application also provides a method for manufacturing the display panel, which will be described in detail below with reference to the accompanying drawings.

[0107] refer to Figure 7 As shown, the manufacturing method of the display panel provided in this application embodiment includes the following steps:

[0108] S101, a planarization layer is formed on the substrate.

[0109] In the embodiments of this application, a driving circuit layer and a planarization layer can be sequentially formed on the substrate, and the material of the planarization layer can be...

[0110] S102, the planarization layer is photolithographically lithographically processed using a semi-transparent mask to obtain multiple second grooves.

[0111] In the embodiments of this application, multiple second grooves are obtained by photolithography on the planarization layer. The bottom of the second groove can be a recessed surface. To achieve the recessed surface, a semi-transparent mask can be used to perform photolithography on the planarization layer. The photolithography process for obtaining multiple second grooves using a semi-transparent mask is relatively simple.

[0112] Using a semi-transparent mask for etching eliminates the need for additional processing steps. The original process can be replaced with a semi-transparent mask etching process, thus enabling the manufacture of display panels in a simpler and cost-free way.

[0113] S103 forms the light-emitting layer.

[0114] In embodiments of this application, after obtaining a second groove with a recessed surface, a light-emitting layer can be formed. The light-emitting layer includes a light-emitting device disposed in the second groove, wherein the side of the light-emitting device away from the substrate is the recessed surface. The light-emitting layer can be formed using a vapor deposition process.

[0115] S104, using photolithography, forms the first optical structure layer on the side of the light-emitting layer away from the substrate.

[0116] In the embodiments of this application, a pixel definition layer, an encapsulation layer, and a touch layer are sequentially formed on the light-emitting layer, and then a first optical structure layer is formed on the touch layer. Specifically, the first optical structure layer can be formed using a photolithography process. The pixel definition layer has multiple pixel openings. The pixel openings expose the light-emitting devices corresponding to the pixel openings, that is, the light-emitting devices and pixel openings can correspond one-to-one, and the projection of the light-emitting devices on the pixel definition layer is located within the pixel openings.

[0117] The projection of the first optical structure layer onto the substrate and the projection of the light-emitting device onto the substrate overlap, so that the converging light emitted by the light-emitting device can be adjusted into a narrow-angle light emission by using the first optical structure layer.

[0118] In one embodiment, the side of the first optical structure layer closest to the substrate is a plane parallel to the plane of the substrate. In this case, a high refractive index film layer is directly formed on the touch layer, and then the high refractive index film layer is etched using a photolithography process to obtain the first optical structure layer.

[0119] In another embodiment, the side of the first optical structure layer closest to the substrate is a second raised surface. A semi-transparent mask can be used to perform photolithography on the touch layer to obtain multiple first grooves. A high-refractive-index film layer is formed on the surface of the first grooves and the touch layer, i.e., the high-refractive-index film layer fills the first grooves and covers the touch layer. The high-refractive-index film layer is then etched using photolithography, thus forming the first optical structure layer on the side of the touch layer away from the substrate. At this point, the first optical structure layer is disposed in the first groove. Since the bottom of the first groove is a recessed surface, the side of the first optical structure layer closest to the substrate is a second raised surface. The protrusion direction of the second raised surface is the same as the concave direction of the recessed surface of the first groove. The first optical structure layer also includes a first raised surface on the side away from the substrate, and the protrusion direction of the second raised surface is opposite to the protrusion direction of the first raised surface.

[0120] In embodiments of this application, a second optical structure layer may also be formed on the surface of the first optical structure layer, the second optical structure layer covering the first optical structure layer, and the refractive index of the first optical structure layer being greater than the refractive index of the second optical structure layer.

[0121] In the embodiments of this application, a light-emitting blocking layer may also be formed, and the light-emitting blocking layer may be etched to form a light-emitting opening so that light rays with a small viewing angle can be emitted, while the light-emitting blocking layer is used to block light rays with a large viewing angle from being emitted.

[0122] This application also provides a display device, including the display panel described in the above embodiments.

[0123] refer to Figure 8 This is a schematic diagram of the planar structure of a display device provided in an embodiment of this application. As shown in the figure, the display device 1000 includes a display panel 100, which is the display panel 100 described in any of the above embodiments. The display device 1000 provided in this application embodiment can be other display devices with display functions, such as mobile phones, computers, televisions, and vehicle-mounted display devices; this application embodiment does not specifically limit its capabilities. The display device 1000 provided in this application embodiment has the beneficial effects of the display panel 100 provided in this application embodiment. For details, please refer to the specific description of the display panel in the above embodiments; this application embodiment will not repeat the description here.

[0124] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0125] The term "comprising" and its variations as used herein are open-ended inclusion, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; and the term "some embodiments" means "at least some embodiments".

[0126] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A display panel, characterized by, Comprise: a substrate; a light-emitting layer on one side of the substrate, the light-emitting layer comprising a light-emitting device, the light-emitting device being a concave surface away from the substrate; a first optical structure layer on the side of the light-emitting layer away from the substrate; the first optical structure layer overlaps the projection of the light-emitting device on the substrate, and the first optical structure layer is a first convex surface away from the substrate; the first optical structure layer is used to adjust the converging light rays emitted by the light-emitting device to small viewing angle light rays; wherein the distance between the focal point of the light-emitting device and the focal point of the first optical structure layer close to the substrate is less than a target threshold along the direction perpendicular to the plane where the substrate is located.

2. The display panel of claim 1, wherein, The side of the first optical structure layer close to the substrate is a plane, and the maximum thickness of the first optical structure layer ranges from [2μm, 8μm] along the direction perpendicular to the plane where the substrate is located.

3. The display panel of claim 1, wherein, The focal point of the light-emitting device coincides with the focal point of the first optical structure layer close to the substrate.

4. The display panel of claim 1, wherein, The side of the first optical structure layer close to the substrate is a second convex surface, and the convex direction of the second convex surface is opposite to that of the first convex surface.

5. The display panel of claim 4, wherein, The second convex surface and the first convex surface are arranged in axial symmetry.

6. The display panel of claim 5, wherein, Further comprising a touch layer, the touch layer is arranged between the first optical structure layer and the light-emitting layer, the touch layer comprises a first groove, the first optical structure layer is arranged in the first groove, and the second convex surface and the first convex surface take the interface between the first optical structure layer and the touch layer as the axis of symmetry.

7. The display panel according to any one of claims 1-6, wherein, Further comprising a second optical structure layer, the second optical structure layer covers the first optical structure layer, and the refractive index of the first optical structure layer is greater than that of the second optical structure layer.

8. The display panel according to any one of claims 1-6, wherein, The concave surface and the first convex surface are arc surfaces.

9. The display panel according to any one of claims 1-6, wherein, The side of the light-emitting device close to the substrate is a concave surface.

10. The display panel according to any one of claims 1-6, wherein, Further comprising a pixel definition layer, the pixel definition layer comprises a pixel opening corresponding to the light-emitting device, and the projection of the light-emitting device on the pixel definition layer is located in the pixel opening.

11. The display panel of claim 10, wherein, The minimum boundary distance between the projection of the first optical structure layer on the pixel definition layer and the pixel opening ranges from [-0.5μm, 2μm], and the minimum boundary distance takes the direction of the light-emitting device towards the pixel definition layer and parallel to the plane where the substrate is located as the positive direction.

12. The display panel according to any one of claims 1-6, wherein, Further comprising a light-blocking layer, the light-blocking layer comprises a light-emitting opening, and the light-blocking layer is used to block the emission of large viewing angle light rays.

13. The display panel of claim 12, wherein, Further comprising a pixel definition layer, the pixel definition layer comprises a pixel opening corresponding to the light-emitting device, and the projection size of the light-emitting opening on the pixel definition layer is greater than the size of the pixel opening.

14. The display panel according to any one of claims 1-6, wherein, Further comprising a planarization layer, the planarization layer comprises a plurality of second grooves, and the light-emitting device is arranged in the second groove.

15. A manufacturing method of a display panel, characterized by, Comprise: forming a planarization layer on a substrate; using a semi-transparent mask to perform photolithography on the planarization layer to obtain a plurality of second grooves; forming a light-emitting layer, the light-emitting layer comprising a light-emitting device, the light-emitting device being disposed in the second recess, a side of the light-emitting device away from the substrate being a concave surface; forming a first optical structure layer on a side of the light-emitting layer away from the substrate by using a photolithography process, the first optical structure layer overlapping a projection of the substrate and a projection of the light-emitting device on the substrate, a side of the first optical structure layer away from the substrate being a first convex surface; the first optical structure layer is configured to adjust convergent light rays emitted by the light-emitting device to be small-view-angle light rays; and wherein, along a direction perpendicular to a plane on which the substrate lies, a distance between a focal point of the light-emitting device and a focal point of the first optical structure layer close to the substrate is less than a target threshold value.

16. The method of claim 15, wherein, The method further comprises: forming a touch layer on a side of the light-emitting layer away from the substrate; performing photolithography on the touch layer by using a semi-transparent mask to obtain a plurality of first recesses; the forming of the first optical structure layer on the side of the light-emitting layer away from the substrate by using a photolithography process comprises: forming a high-refraction film layer, the high-refraction film layer filling the first recesses and covering the touch layer, and performing etching on the high-refraction film layer by using a photolithography process to form a first optical structure layer on a side of the touch layer away from the substrate, the first optical structure layer being disposed in the first recesses, a side of the first optical structure layer close to the substrate being a second convex surface, a convex direction of the second convex surface being opposite to a convex direction of the first convex surface.

17. The method according to claim 15 or 16, characterized in that, The method further comprises: forming a second optical structure layer, the second optical structure layer covering the first optical structure layer, a refractive index of the first optical structure layer being greater than a refractive index of the second optical structure layer.

18. The method of claim 17, wherein, The method further comprises: forming a light-emitting blocking layer, and etching the light-emitting blocking layer to form a light-emitting opening.

19. A display device comprising: The display device comprises the display panel of any one of claims 1-14.

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