Display panel and display device

Abstract

The present application discloses a display panel and a display device. The display panel comprises: a display substrate having a light-transmitting region and a display region; a first dimming layer located in the light-transmitting region of the display substrate and comprising first light-transmitting holes; a second dimming layer continuously covering the first dimming layer and the sidewalls and bottoms of the first light-transmitting holes; and a third dimming layer covering the second dimming layer and filling the first light-transmitting holes, wherein the refractive index of the first dimming layer is greater than the refractive index of the second dimming layer and less than the refractive index of the third dimming layer.

Description

Display panel and display device TECHNICAL FIELD

[0001] The present application belongs to the technical field of display, and particularly relates to a display panel and a display device. BACKGROUND

[0002] With the increasing requirement of screen ratio of electronic equipment, the camera under panel (CUP) technology emerges as the times require. At present, in order to improve the light transmittance of the CUP area of the display panel to meet the imaging requirement of the camera, it is required to reduce the pixel density in the CUP area or reduce the pixel area in the CUP area. Although this scheme can improve the light transmittance of the CUP area, due to the reduction of the pixel density in the CUP area or the reduction of the pixel area, the brightness of the CUP area is lower than that of the normal display area under the same driving current, which affects the overall display effect of the screen. SUMMARY

[0003] The present application provides a display panel and a display device, which can reduce or eliminate the display brightness difference between the light transmission area and the display area, thereby improving the overall display effect of the display panel.

[0004] In a first aspect, the present application provides a display panel, comprising a display substrate and a light modulation functional layer located on the light exit side of the display substrate; the display substrate has a light transmission area and a display area arranged adjacently, and the light transmittance of the light transmission area is greater than that of the display area; the display substrate comprises a plurality of first sub-pixels located in the light transmission area and a plurality of second sub-pixels located in the display area.

[0005] The light modulation functional layer comprises a first light modulation layer, a second light modulation layer and a third light modulation layer stacked on the display substrate; the first light modulation layer is located at least in the light transmission area and comprises a plurality of first light transmission holes arranged one-to-one with the plurality of first sub-pixels; the first light transmission hole comprises a first side wall and a first bottom, and the included angle between the first side wall and the first bottom is greater than 90° and less than 180°; the second light modulation layer is at least continuously covered on the side of the first light modulation layer located in the light transmission area away from the display substrate, the first side wall and the first bottom; the third light modulation layer is at least covered on the second light modulation layer and filled in the first light transmission hole.

[0006] Wherein, the refractive index of the first light modulation layer is greater than the refractive index of the second light modulation layer, and the refractive index of the first light modulation layer is less than the refractive index of the third light modulation layer.

[0007] In a second aspect, the present application provides a display device, comprising an optical sensor and a display panel, the display panel comprising a display substrate and a light-adjusting functional layer located on the light-emitting side of the display substrate; the display substrate has a light-transmitting region and a display region arranged adjacently, and the light-transmitting region has a higher light transmittance than the display region; the display substrate comprises a plurality of first sub-pixels located in the light-transmitting region and a plurality of second sub-pixels located in the display region.

[0008] The light-adjusting functional layer comprises a first light-adjusting layer, a second light-adjusting layer and a third light-adjusting layer stacked on the display substrate; the first light-adjusting layer is located at least in the light-transmitting region and comprises a plurality of first light-transmitting holes arranged one-to-one with the plurality of first sub-pixels; the first light-transmitting hole comprises a first side wall and a first bottom, and the included angle between the first side wall and the first bottom is greater than 90° and less than 180°; the second light-adjusting layer is at least continuously covered on the side of the first light-adjusting layer located in the light-transmitting region, the first side wall and the first bottom away from the display substrate; the third light-adjusting layer is at least covered on the second light-adjusting layer and filled in the first light-transmitting hole;

[0009] The refractive index of the first light-adjusting layer is greater than the refractive index of the second light-adjusting layer, and the refractive index of the first light-adjusting layer is less than the refractive index of the third light-adjusting layer;

[0010] The optical sensor is located on the side of the display substrate away from the first light-adjusting layer and arranged correspondingly with the light-transmitting region. BRIEF DESCRIPTION OF DRAWINGS

[0011] The technical solutions and other beneficial effects of the present application will become apparent from the following detailed description of specific embodiments of the present application, taken in conjunction with the accompanying drawings.

[0012] FIG. 1 is a schematic diagram of the cross-sectional structure of an exemplary display panel.

[0013] FIG. 2 is a schematic diagram of the sub-pixels of the effective display region and the under-screen camera region of an exemplary display panel.

[0014] FIG. 3 is a schematic diagram of the sub-pixels of the effective display region and the under-screen camera region of another exemplary display panel.

[0015] FIG. 4 is a schematic diagram of the top view of a display panel according to an embodiment of the present application.

[0016] FIG. 5 is a schematic diagram of the cross-sectional structure at A-A' in FIG. 4.

[0017] FIG. 6 is a partial enlarged view of the P region in FIG. 5.

[0018] FIG. 7 is a schematic diagram of the partial structure of the first light-adjusting layer and the second light-adjusting layer in FIG. 6.

[0019] Fig. 8 is another sectional structure schematic view of A-A' in Fig. 4.

[0020] Fig. 9 is another sectional structure schematic view of A-A' in Fig. 4.

[0021] Fig. 10 is another sectional structure schematic view of A-A' in Fig. 4.

[0022] Fig. 11 is another sectional structure schematic view of A-A' in Fig. 4.

[0023] Fig. 12 is a structure schematic view of the second light adjusting layer in the first light transmission hole in Fig. 11.

[0024] Fig. 13 is a structure schematic view of the second light adjusting layer in the second light transmission hole in Fig. 11.

[0025] Fig. 14 is a sectional structure schematic view of a display device provided by an embodiment of the present application. Embodiments of the present application

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0027] In the description of the present application, it should be understood that the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms “first” and “second” are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by “first” and “second” can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of “multiple” is two or more, unless otherwise specifically limited.

[0028] In the description of the present application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0030] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to the same reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0031] As shown in FIG. 1, an exemplary display panel 1 includes an array substrate 2, a light-emitting layer 3, an encapsulation layer 4, a touch layer 5 and a protective layer 6 from bottom to top. Among them, the light-emitting layer 3 includes a plurality of sub-pixels 7 arranged in an array, each sub-pixel 7 includes any one of a red sub-pixel (R), a green sub-pixel (G) and a blue sub-pixel (B). As shown in FIG. 2 and FIG. 3, the display panel 1 can be divided into an effective display area (AA area) 8 and an under-screen camera area (CUP area) 9, both the AA area and the CUP area can display images, so as to realize full-screen display, at the same time, the CUP area is also used to provide light to the optical sensor (such as camera) arranged on the back or inside of the display panel 1, thereby realizing the optical sensing function.

[0032] In order to ensure the light transmittance of the CUP area while realizing the full-screen display, the sub-pixel density or the sub-pixel area in the CUP area can be reduced. For example, as shown in FIG. 2, the distance between the centers of adjacent blue sub-pixels (B) and green sub-pixels (G) in the AA area 8 is a, and the distance between the centers of adjacent blue sub-pixels (B) and green sub-pixels (G) in the CUP area 9 is b; wherein a is less than b. That is, the sub-pixel density in the CUP area 9 is less than the sub-pixel density in the AA area 8. This design makes the distance between the sub-pixels in the CUP area 9 larger, so as to ensure that the CUP area 9 can transmit a sufficient amount of light to ensure that the optical sensor can be normally used.

[0033] Alternatively, as shown in FIG. 3, the distance between the centers of adjacent blue sub-pixels (B) and green sub-pixels (G) in the AA area 8 is a, and the distance between the centers of adjacent blue sub-pixels (B) and green sub-pixels (G) in the CUP area 9 is a'; wherein a' is equal to a. That is, the sub-pixel density in the CUP area 9 is equal to the sub-pixel density in the AA area 8. However, as can be seen from the blue sub-pixels (B) in the AA area 8 and the CUP area 9 in FIG. 3, the area of the blue sub-pixel (B) in the CUP area 9 is obviously smaller than the area of the blue sub-pixel (B) in the AA area 8. This design reduces the area of at least part of the sub-pixels in the CUP area 9 on the basis of ensuring that the sub-pixel density is unchanged, so as to ensure that the CUP area 9 can transmit a sufficient amount of light to ensure that the optical sensor can be normally used.

[0034] Generally, the upper layer stack structures of the CUP area 9 and the AA area 8 are consistent. Due to the reduction of the sub-pixel density or the reduction of the sub-pixel area in the CUP area 9, there is a difference in display brightness between the AA area 8 and the CUP area 9 of the display panel 1 under the same current driving, and the difference in brightness will increase after aging test, resulting in poor overall display effect of the display panel.

[0035] It can be understood that when the sub-pixel density or the sub-pixel area in the CUP area 9 is reduced, the display brightness of the AA area 8 of the display panel 1 is greater than the display brightness of the CUP area 9 under the same current driving.

[0036] In order to solve the above technical problems, the present application provides a display panel and a display device, which improve the display brightness of the CUP area by differentiating the design of the upper layer stack of the AA area and the CUP area of the display panel, so that the display brightness of the AA area and the CUP area of the display panel is consistent, thereby improving the overall display effect of the display panel. For details, please refer to the description below.

[0037] Embodiments of the present application provide a display panel, which comprises a display substrate and a light-adjusting functional layer located on the light-emitting side of the display substrate. The display substrate has a light-transmitting region and a display region arranged adjacently, and the light-transmitting region has a light transmittance greater than that of the display region. The display substrate comprises a plurality of first sub-pixels located in the light-transmitting region and a plurality of second sub-pixels located in the display region.

[0038] The light-adjusting functional layer comprises a first light-adjusting layer, a second light-adjusting layer and a third light-adjusting layer stacked on the display substrate. The first light-adjusting layer is located at least in the light-transmitting region and comprises a plurality of first light-transmitting holes arranged one-to-one with the plurality of first sub-pixels. The first light-transmitting hole comprises a first side wall and a first bottom, and the included angle between the first side wall and the first bottom is greater than 90° and less than 180°. The second light-adjusting layer is at least continuously covered on the side of the first light-adjusting layer located in the light-transmitting region, the first side wall and the first bottom away from the display substrate. The third light-adjusting layer is at least covered on the second light-adjusting layer and filled in the first light-transmitting hole.

[0039] In the present application, the refractive index of the first light-adjusting layer is greater than that of the second light-adjusting layer, and the refractive index of the first light-adjusting layer is less than that of the third light-adjusting layer.

[0040] Specifically, the present application differentiates the light-adjusting of the light-transmitting region and the display region through the light-adjusting functional layer, so as to realize the effect of reducing or eliminating the display brightness difference between the light-transmitting region and the display region.

[0041] In some embodiments, the light-adjusting functional layer has no light-adjusting function for the display region, or has a weak light-adjusting effect for the display region, so that the display brightness difference between the light-transmitting region and the display region is less than or equal to a preset value, thereby making the user unable to observe the display difference between the light-transmitting region and the display region.

[0042] In a specific embodiment, the above-mentioned preset value is 10%, that is, when the display brightness difference between the light-transmitting region and the display region is less than or equal to 10%, the user cannot observe the display difference between the light-transmitting region and the display region.

[0043] In some embodiments, the light-transmitting region is a camera under screen region (CUP region), and the display region is an active display region (AA region). The light-transmitting region of the present application can be used for display and light transmission, so as to realize the function of optical sensing (such as camera) under screen on the basis of realizing full-screen display.

[0044] In some embodiments, the density of the first sub-pixels in the light-transmitting region is less than the density of the second sub-pixels in the display region, or the area of a single first sub-pixel in the light-transmitting region is less than the area of a single second sub-pixel of the same color in the display region. By reducing the density or area of the first sub-pixel in the light-transmitting region, the light transmittance of the light-transmitting region can be improved, so as to provide more light for the optical sensor under screen, thereby improving the sensitivity of the optical sensor.

[0045] It can be understood that if the density or area of the first sub-pixel in the light transmission area is reduced and the light modulation function layer is not arranged in the light transmission area, the display brightness of the light transmission area will be less than the display brightness of the display area under the same driving condition, resulting in poor overall display effect of the display panel. In order to solve the problem of brightness difference between the light transmission area and the display area, the light modulation function layer in the embodiments of the present application is arranged at least in the light transmission area with higher light transmission rate, and the light transmission area and the display area are differentially modulated by the light modulation function layer. At least the display brightness of the light transmission area is improved, and the difference in display brightness between the light transmission area and the display area is infinitely reduced or eliminated, thereby improving the overall display effect of the display panel.

[0046] Specifically, the third light modulation layer is a high-refractive film layer, the second light modulation layer and the first light modulation layer are low-refractive film layers, and the first light modulation layer, the second light modulation layer and the third light modulation layer located in the light transmission area form a first light extraction structure.

[0047] When the first sub-pixel in the light transmission area emits light, the following several light paths are included: part of the large-angle light enters the third light modulation layer in the first light transmission hole, and total reflection occurs on the contact interface between the second light modulation layer and the third light modulation layer at the first side wall, and the light after total reflection is emitted from the direction close to the normal viewing angle; another part of the large-angle light enters the third light modulation layer in the first light transmission hole, and then is refracted on the contact interface between the third light modulation layer and the second light modulation layer at the first side wall, and then is reflected on the contact interface between the first light modulation layer and the second light modulation layer, and finally is refracted from the direction close to the normal viewing angle through the contact interface between the second light modulation layer and the third light modulation layer; another part of the large-angle light is directly emitted from the direction close to the normal viewing angle through the multiple refraction of the first light modulation layer, the second light modulation layer and the third light modulation layer at the first bottom when entering the first light transmission hole. The above several cases can improve the light extraction amount of the normal viewing angle of the light transmission area, thereby improving the display brightness of the light transmission area. Therefore, the first light extraction structure located in the light transmission area can effectively convert the large-angle light of the light transmission area into normal viewing angle light, thereby effectively improving the display brightness of the light transmission area.

[0048] Specifically, the light modulation function layer can be arranged only in the light transmission area, at this time, only the display brightness of the light transmission area is improved, so that the difference between the display brightness of the light transmission area and the display brightness of the display area is reduced or even eliminated.

[0049] Of course, the light modulation function layer can also be arranged in the light transmission area and the display area at the same time, and the light extraction effect of the light modulation function layer on the light transmission area is higher than that on the display area. This design can reduce the difference between the display brightness of the light transmission area and the display brightness of the display area on the basis of improving the overall display brightness of the display panel.

[0050] In the embodiments of the present application, the light modulation functional layer is arranged on the light-emitting side of the display substrate having the light-transmitting area and the display area with different light transmittances, the first light modulation layer, the second light modulation layer and the third light modulation layer in the light modulation functional layer are arranged at least corresponding to the light-transmitting area with relatively large light transmittance, the refractive index of the first light modulation layer is larger than that of the second light modulation layer and smaller than that of the third light modulation layer; when the light emitted by the display substrate is incident in the direction of the first side wall of the first light-transmitting hole, total reflection can occur on the contact interface between the third light modulation layer and the second light modulation layer with relatively large refractive index difference, and finally the light is emitted from the direction close to the normal viewing angle and used for display, so that the light modulation functional layer of the present application can effectively improve the display brightness of the light-transmitting area; at the same time, the light modulation functional layer has no light modulation function for the display area or has weak light modulation effect for the display area, so that the display brightness difference between the light-transmitting area and the display area is reduced, thereby being beneficial to reducing or eliminating the display brightness difference between the light-transmitting area and the display area, and further effectively improving the overall display effect of the display panel.

[0051] The present application will be described in detail through the following specific embodiments.

[0052] As shown in FIGS. 4 and 5, the embodiments of the present application provide a display panel 10a, which comprises a display substrate 11 and a light modulation functional layer 12 located on the light-emitting side of the display substrate 11.

[0053] Specifically, the display substrate 11 has a light-transmitting area 13 and a display area 14 arranged adjacently, and the light transmittance of the light-transmitting area 13 is larger than that of the display area 14. In addition, the display substrate 11 comprises a plurality of first sub-pixels 15 located in the light-transmitting area 13 and a plurality of second sub-pixels 16 located in the display area 14.

[0054] In some embodiments, as shown in FIG. 5, the display substrate 11 comprises an array substrate 17 located in the light-transmitting area 13 and the display area 14, and a light-emitting layer 18, an encapsulation layer 19 and a touch layer 20 stacked on the array substrate 17; the light modulation functional layer 12 is located on the side of the touch layer 20 away from the encapsulation layer 19, and the first sub-pixels 15 and the second sub-pixels 16 are located in the light-emitting layer 18.

[0055] It can be understood that the light-emitting layer 18 and the encapsulation layer 19 are arranged in the light-transmitting area 13 and the display area 14; the touch layer 20 can be arranged according to the situation, for example, the touch layer 20 can be arranged only in the display area 14, or can be arranged in the light-transmitting area 13 and the display area 14 at the same time, which is not limited in the present application.

[0056] Of course, in some embodiments, the display substrate 11 can not be provided with the touch layer 20, at this time, the light modulation functional layer 12 is located on the side of the encapsulation layer 19 away from the light-emitting layer 18.

[0057] Specifically, the array substrate 17 is provided with a driving circuit (not shown) for driving the first sub-pixels 15 and the second sub-pixels 16 in the light-emitting layer 18 to emit light. Each first sub-pixel 15 and each second sub-pixel 16 includes any one of a red sub-pixel (R), a green sub-pixel (G), and a blue sub-pixel (B).

[0058] In some embodiments, the first sub-pixels 15 and the second sub-pixels 16 include OLED devices, but are not limited thereto.

[0059] In some embodiments, the density of the first sub-pixels 15 in the light-transmitting area 13 is less than the density of the second sub-pixels 16 in the display area 14, and / or the area of a single first sub-pixel 15 in the light-transmitting area 13 is less than the area of a single second sub-pixel 16 of the same color in the display area 14. By reducing the density and / or area of the first sub-pixels 15 in the light-transmitting area 13, the light transmittance of the light-transmitting area 13 can be improved, thereby providing more light for the under-screen optical sensor device, and further improving the sensitivity of the optical sensor.

[0060] Specifically, the encapsulation layer 19 includes a thin film encapsulation (TFE) layer, but is not limited thereto.

[0061] Specifically, as shown in FIGS. 5 and 6, the light-adjusting functional layer 12 includes a first light-adjusting layer 12a, a second light-adjusting layer 12b, and a third light-adjusting layer 12c stacked on the display substrate 11. The first light-adjusting layer 12a and the third light-adjusting layer 12c are located in the light-transmitting area 13 and the display area 14, and the second light-adjusting layer 12b is located in the light-transmitting area 13.

[0062] Specifically, the first light-adjusting layer 12a includes a plurality of first light-transmitting holes 21 arranged in one-to-one correspondence with the plurality of first sub-pixels 15. The first light-transmitting hole 21 includes a first side wall 21a and a first bottom 21b, and the included angle θ1 between the first side wall 21a and the first bottom 21b is greater than 90° and less than 180°. The second light-adjusting layer 12b continuously covers the side of the first light-adjusting layer 12a in the light-transmitting area 13 away from the display substrate 11, the first side wall 21a, and the first bottom 21b. The third light-adjusting layer 12c covers the first light-adjusting layer 12a and the second light-adjusting layer 12b and fills in the first light-transmitting hole 21.

[0063] The refractive index of the first light-adjusting layer 12a is greater than the refractive index of the second light-adjusting layer 12b, and the refractive index of the first light-adjusting layer 12a is less than the refractive index of the third light-adjusting layer 12c.

[0064] In some embodiments, the display brightness difference between the light-transmitting area 13 and the display area 14 is less than or equal to 10%, so that the user cannot observe the display difference between the light-transmitting area 13 and the display area 14.

[0065] In some embodiments, the cross-sectional shape of the first light-transmissive hole 21 in the thickness direction of the display substrate 11 includes any one or a combination of trapezoidal, circular arc, and polygonal shapes.

[0066] It can be understood that the first bottom 21b of the first light-transmissive hole 21 is at the same position as the surface of the display substrate 11 exposed by the first light-transmissive hole 21.

[0067] Specifically, the first light extraction structure 22 is constituted by the first light modulation layer 12a, the second light modulation layer 12b, and the third light modulation layer 12c located in the light-transmissive region 13.

[0068] When the first sub-pixel 15 in the light-transmissive region 13 emits light, the following light paths are included: as shown in light path a in FIG. 6, the light rays of the normal viewing angle emitted toward the first light-transmissive hole 21 directly pass through the second light modulation layer 12b and the third light modulation layer 12c and are emitted from the direction of the normal viewing angle; as shown in light paths b and c in FIG. 6, a part of the light rays of the large viewing angle incident toward the first side wall 21a are totally reflected on the contact interface between the second light modulation layer 12b and the third light modulation layer 12c and are emitted from the direction close to the normal viewing angle; of course, another part of the light rays of the large viewing angle incident toward the first side wall 21a are refracted on the contact interface between the third light modulation layer 12c and the second light modulation layer 12b, are reflected on the contact interface between the first light modulation layer 12a and the second light modulation layer 12b first, are refracted on the contact interface between the second light modulation layer 12b and the third light modulation layer 12c second, and are finally emitted from the direction close to the normal viewing angle; meanwhile, a part of the light rays of the large viewing angle incident toward the first bottom 21b are refracted on the contact interface between the second light modulation layer 12b and the third light modulation layer 12c and are emitted from the direction close to the normal viewing angle. Therefore, the first light extraction structure 22 located in the light-transmissive region 13 can convert more light rays of the large viewing angle into light rays of the normal viewing angle, thereby effectively improving the display brightness of the light-transmissive region 13.

[0069] It can be understood that the incident angle of the light rays totally reflected on the contact interface between the second light modulation layer 12b and the third light modulation layer 12c is greater than or equal to the critical angle of total reflection, and the incident angle of the light rays refracted on the contact interface between the second light modulation layer 12b and the third light modulation layer 12c is less than the critical angle of total reflection.

[0070] Specifically, as shown in FIG. 5, although the first light-adjusting layer 12a and the third light-adjusting layer 12c in the light-adjusting function layer 12 both extend from the light-transmitting region 13 to cover the display region 14, the first light-adjusting layer 12a located in the display region 14 is not perforated to form an interface for total reflection. Since the refractive index of the first light-adjusting layer 12a is smaller than that of the third light-adjusting layer 12c, the first light-adjusting layer 12a and the third light-adjusting layer 12c stacked in the display region 14 form a second light extraction structure 24a. Part of the light emitted by the second sub-pixel 16 deviating from the normal viewing angle direction can be refracted at the interface between the first light-adjusting layer 12a and the third light-adjusting layer 12c and then emitted from a direction close to the normal viewing angle.

[0071] Compared with the second light extraction structure 24a, the first light extraction structure 22 can convert a larger range of large viewing angle light into normal viewing angle light, and thus the light extraction effect of the first light extraction structure 22 is better than that of the second light extraction structure 24a.

[0072] Since the first light extraction structure 22 can improve the display brightness of the light-transmitting region 13 and the second light extraction structure 24a can improve the display brightness of the display region 14, the embodiments of the present application can improve the display brightness of the entire display panel 10a. At the same time, since the light extraction effect of the first light extraction structure 22 is better than that of the second light extraction structure 24a, the brightness difference between the light-transmitting region 13 and the display region 14 can be reduced or eliminated, thereby improving the overall display effect of the display panel 10a.

[0073] In some embodiments, the thickness of the first light-adjusting layer 12a located in the light-transmitting region 13 and the display region 14 is the same, and the distance between different positions of the side of the third light-adjusting layer 12c away from the display substrate 11 and the display substrate 11 is the same. This design ensures that the overall thickness of the display panel 10a of the light-transmitting region 13 and the display region 14 is consistent, which is convenient for subsequent setting of other film layers on the third light-adjusting layer 12c. At the same time, the continuous arrangement of the first light-adjusting layer 12a and the third light-adjusting layer 12c in the light-transmitting region 13 and the display region 14 is conducive to simplifying the manufacturing process. For example, before the first light-adjusting layer 12a is subjected to patterning treatment, a full-area coating process or a full-area deposition process can be used to manufacture the first light-adjusting layer 12a with uniform thickness, and subsequently a full-area coating process can be used to manufacture the third light-adjusting layer 12c with a flat surface.

[0074] It can be understood that, since the second light-adjusting layer 12b is only located in the light-transmitting region 13, and the first light-adjusting layer 12a located in the light-transmitting region 13 is provided with the first light-transmitting hole 21, the thickness of the third light-adjusting layer 12c located in the light-transmitting region 13 is different from that of the third light-adjusting layer 12c located in the display region 14, so that the side of the third light-adjusting layer 12c away from the display substrate 11 always remains flat, which is conducive to improving the flatness of the surface of the display panel 10a.

[0075] In some embodiments, the material of at least the second light-adjusting layer 12b and the third light-adjusting layer 12c in the light-adjusting functional layer 12 is adhesive material, and the material of the second light-adjusting layer 12b and the third light-adjusting layer 12c is different. Since the material of the third light-adjusting layer 12c is an adhesive layer, the third light-adjusting layer 12c can be directly used as an adhesive layer for bonding the upper film layer, thereby saving a layer of adhesive layer.

[0076] In some embodiments, the first light-adjusting layer 12a is a passivation layer or a protective layer, which can play a role of protecting the lower structure while playing a role of light extraction. It can be understood that the material of the first light-adjusting layer 12a is not limited in the embodiments of the present application. In order to realize the thinning of the display panel 10a, the passivation layer or the protective layer located on the light-out side of the display substrate 11 can be directly used as the first light-adjusting layer 12a, for example, the first light-adjusting layer 12a is an over coating (OC) layer or a passivation (PAS) layer arranged on the light-out side of the display substrate 11.

[0077] In a specific embodiment, the second light-adjusting layer 12b and the third light-adjusting layer 12c can be pressure sensitive adhesive (PSA) with different refractive indexes and different materials; the second light-adjusting layer 12b can be a residual layer formed by the residual of the first PSA adhesive layer on other film layers (such as a protective film), and the third light-adjusting layer 12c can be a second PSA adhesive layer for bonding the upper optical film (such as a polarizing film or a polarizing functional layer in the polarizing film). Therefore, the light-adjusting functional layer 12 provided by the embodiments of the present application can not only improve the difference in display brightness between the light-transmitting area 13 and the display area 14, but also can be directly used for bonding other film layer structures, which is conducive to reducing the overall thickness of the display panel 10a.

[0078] Specifically, the thickness of the second light-adjusting layer 12b located at different positions is consistent, and the thickness of the second light-adjusting layer 12b is less than the thickness of the third light-adjusting layer 12c.

[0079] In some embodiments, the thickness of the second light-adjusting layer 12b ranges from 50 nanometers to 200 nanometers. For example, the thickness of the second light-adjusting layer 12b is 50 nanometers, 70 nanometers, 100 nanometers, 120 nanometers, 150 nanometers, 170 nanometers or 200 nanometers.

[0080] It should be noted that the thickness of the second light-adjusting layer 12b is consistent, which means that the thickness is uniform; as shown in FIG. 7, the thickness d1 and d5 of the second light-adjusting layer 12b located on the surface of the first light-adjusting layer 12a, the thickness d2 and d4 of the second light-adjusting layer 12b located on the first side wall 21a, and the thickness d3 of the second light-adjusting layer 12b located on the first bottom 21b are all equivalent, i.e., d1=d2=d3=d4=d5.

[0081] Since the first light-adjusting layer 12a forms the first light-transmitting hole 21 through the patterning process, the surface of the display substrate 11 has a plurality of convex structures. In the subsequent process, the rolling action will occur. The adhesive layer (for example, the PSA layer) on the top protective film (TPF) will be unevenly left on the surface of the display substrate 11 where the first light-adjusting layer 12a is formed after rolling, causing the appearance abnormality problem. The embodiment of the present application sets the second light-adjusting layer 12b with uniform thickness on the surface of the first light-adjusting layer 12a and the first side wall 21a and the first bottom 21b of the first light-transmitting hole 21. For example, through the selection of the adhesive layer material or the improvement of the rolling process, the adhesive layer in the TPF is evenly left on the surface of the display substrate 11 where the first light-adjusting layer 12a is formed after rolling, forming the second light-adjusting layer 12b with uniform thickness and continuous arrangement, thereby effectively improving the above-mentioned appearance abnormality problem.

[0082] In some embodiments, when the second light-adjusting layer 12b is the residual layer of the adhesive layer, in order to obtain the second light-adjusting layer 12b with continuous and uniform thickness, the adhesive layer of the TPF can be subjected to a defoaming treatment, so that the adhesive layer in the TPF can be evenly covered on the surface (including the upper surface and the position of the first side wall) of the first light-adjusting layer 12a and the surface of the exposed display substrate 11.

[0083] It can be understood that the TPF can be attached according to the distribution position of the second light-adjusting layer 12b to avoid forming a residual layer at other positions.

[0084] Of course, the second light-adjusting layer 12b in the present application can also be formed by coating and the like.

[0085] Specifically, in order to ensure the uniform thickness of the entire second light-adjusting layer 12b, a glue material with higher adhesion and lower modulus can be selected as the material of the second light-adjusting layer 12b. At this time, whether the residual method of the adhesive layer or the coating method is adopted, it is beneficial to obtain the second light-adjusting layer 12b with uniform thickness and continuous arrangement.

[0086] In a specific embodiment, the adhesion range of the second light-adjusting layer 12b is 1.5 grams force (gf) to 2.5 grams force. For example, the adhesion of the second light-adjusting layer 12b is 1.5 gf, 1.8 gf, 2.0 gf, 2.2 gf or 2.5 gf. By limiting the adhesion range, it is beneficial to obtain the second light-adjusting layer 12b with uniform thickness.

[0087] In some embodiments, the refractive index of the first light-adjustable layer 12a ranges from 1.48 to 1.54, the refractive index of the second light-adjustable layer 12b ranges from 1.48 to 1.52, and the refractive index of the third light-adjustable layer 12c ranges from 1.55 to 1.65. In some embodiments, the refractive index of the third light-adjustable layer 12c is greater than 1.59, for example, the refractive index of the third light-adjustable layer 12c ranges from 1.59 to 1.65. For example, the refractive index of the first light-adjustable layer 12a can be 1.48, 1.5, 1.52, or 1.54, the refractive index of the second light-adjustable layer 12b can be 1.48, 1.5, or 1.52, the refractive index of the third light-adjustable layer 12c can be 1.55, 1.57, 1.59, 1.6, 1.61, 1.63, or 1.65, and the refractive index of the three layers satisfies the aforementioned conditions.

[0088] In a specific embodiment, the refractive index of the first light-adjustable layer 12a is 1.52, the refractive index of the second light-adjustable layer 12b is 1.5, and the refractive index of the third light-adjustable layer 12c is 1.6.

[0089] It can be understood that the second light-adjustable layer 12b and the third light-adjustable layer 12c can be selected from existing PSA materials as long as they satisfy the refractive index, thickness, and adhesion conditions of the present application. However, the inventors have found that conventional PSA materials cannot simultaneously satisfy the material requirements of the second light-adjustable layer 12b and the third light-adjustable layer 12c, and the existing PSA materials must be improved to obtain the required adhesive material.

[0090] In some embodiments, the material of the second light-adjustable layer 12b is selected from at least one of polyurethane (PU) and thermoplastic urethane (TPU), but is not limited thereto.

[0091] In some embodiments, the material of the third light-adjustable layer 12c includes optical glue and functional particles added to the optical glue, the refractive index of the functional particles is greater than the refractive index of the optical glue, and is greater than the refractive index of the second light-adjustable layer 12b. It can be understood that the addition of functional particles to the optical glue serves to increase the refractive index of the third light-adjustable layer 12c to meet the refractive index requirements.

[0092] In some embodiments, the functional particles include high-refractive inorganic particles, but are not limited thereto. It can be understood that the functional particles can be dispersed in the optical glue by doping or other means.

[0093] In some embodiments, the material of the third light-adjustable layer 12c includes an organic high-refractive material containing a benzene ring functional group. Specifically, the bonding of the benzene ring functional group on the molecules of the adhesive material is beneficial to increasing the refractive index of the third light-adjustable layer 12c.

[0094] In some embodiments, the material of the third light-adjusting layer 12c contains an acrylic double bond functional group, wherein the acrylic double bond functional group is conducive to improving the adhesion of the third light-adjusting layer 12c.

[0095] In some embodiments, the material of the third light-adjusting layer 12c can also contain small molecule polar functional groups that are attracted to polyurethane. By increasing the small molecule polar functional groups that are attracted to polyurethane in the material of the third light-adjusting layer 12c, the bonding force between the third light-adjusting layer 12c and the second light-adjusting layer 12b can be improved, avoiding the influence of peeling of the two on light extraction effect or the generation of water vapor intrusion channels.

[0096] In some embodiments, the material of the third light-adjusting layer 12c contains at least one of an acrylic double bond functional group, a benzene ring functional group, and a small molecule polar functional group that is attracted to polyurethane.

[0097] When the material of the third light-adjusting layer 12c contains an acrylic double bond functional group and a small molecule polar functional group that is attracted to polyurethane, the small molecule polar functional group that is attracted to polyurethane can be embedded in the acrylic double bond functional group. This design is conducive to reducing the steric effect of the functional group, thereby improving the adhesion of the third light-adjusting layer 12c.

[0098] When the material of the third light-adjusting layer 12c contains an acrylic double bond functional group and a benzene ring functional group, the benzene ring functional group can be bonded to the acrylic double bond functional group. This material is conducive to improving the adhesion of the third light-adjusting layer 12c and also conducive to improving the refractive index of the third light-adjusting layer 12c.

[0099] When the material of the third light-adjusting layer 12c contains an acrylic double bond functional group, a benzene ring functional group, and a small molecule polar functional group that is attracted to polyurethane, the three functional groups are bonded to each other. This material can more effectively improve the adhesion and refractive index of the third light-adjusting layer 12c.

[0100] In a specific embodiment, the material of the third light-adjusting layer 12c is selected from acrylate or polymethyl methacrylate, but is not limited thereto.

[0101] In some embodiments, as shown in FIG. 5, the display panel 10a further includes a polarizing functional layer 23 disposed on the light-adjusting functional layer 12, and the third light-adjusting layer 12c is adhesively attached to the polarizing functional layer 23.

[0102] It can be understood that the polarizing functional layer is a key film layer in the polarizer (POL). Generally, the PSA layer is provided in the polarizer product. When the PSA layer on the polarizer product meets the refractive index requirement of the third light modulation layer 12c in the present application, the PSA layer in the polarizer product can be directly used as the third light modulation layer 12c when the polarizer is attached, thereby saving a layer of glue layer, which is conducive to reducing the thickness of the display panel 10a and reducing the preparation cost. Of course, when the third light modulation layer 12c is formed separately, the production of the PSA glue layer can be omitted when the polarizer is produced, and the polarizing functional layer of the polarizer is directly attached and fixed with the third light modulation layer 12c when the polarizer is attached, thereby saving a layer of glue layer, which is conducive to reducing the thickness of the display panel 10a and reducing the preparation cost.

[0103] In some embodiments, the polarizing functional layer 23 includes a compensation layer and a polarizing layer stacked on the third light modulation layer 12c. The side of the polarizing functional layer 23 away from the third light modulation layer 12c can also be provided with a substrate or other optical film layer.

[0104] In the embodiments of the present application, by arranging the light modulation functional layer 12 on the light-emitting side of the display substrate 11 having the light-transmitting area 13 and the display area 14 with different light transmittances, the light modulation functional layer 12 includes the first light extraction structure 22 located in the light-transmitting area 13 and the second light extraction structure 24a located in the display area 14, and the light extraction effect of the first light extraction structure 22 on the light-transmitting area 13 with a larger light transmittance is better than that of the second light extraction structure 24a on the display area 14 with a smaller light transmittance. On the one hand, the display brightness of the light-transmitting area 13 and the display area 14 can be improved at the same time, thereby improving the overall display brightness of the display panel 10a. On the other hand, the display brightness difference between the light-transmitting area 13 and the display area 14 is effectively reduced or eliminated through the differential light extraction design. Therefore, the embodiments of the present application can effectively improve the overall display brightness and overall display effect of the display panel 10a.

[0105] As shown in FIG. 4 and FIG. 8, the embodiments of the present application also provide a display panel 10b, which is different from the foregoing embodiments in that the second light modulation layer 12b can also extend from the light-transmitting area 13 to cover the display area 14, the first light modulation layer 12a located in the display area 14 covers the display substrate 11 in its entirety, the second light modulation layer 12b continuously covers the first light modulation layer 12a located in the display area 14, and the third light modulation layer 12c covers the second light modulation layer 12b located in the display area 14. At this time, the first light modulation layer 12a, the second light modulation layer 12b, and the third light modulation layer 12c located in the display area 14 are stacked to form the second light extraction structure 24b, and the light extraction effect of the second light extraction structure 24b is still less than that of the first light extraction structure 22.

[0106] When the second light-adjusting layer 12b in the embodiment of the present application is manufactured, the second light-adjusting layer 12b with uniform thickness can be formed on the entire light-transmitting area 13 and display area 14, and the second light-adjusting layer 12b does not need to be patterned, thereby saving a mask and simplifying the manufacturing process of the display panel 10b, and thus the cost is saved. Meanwhile, the refractive index difference between the second light-adjusting layer 12b and the third light-adjusting layer 12c is larger than the refractive index difference between the first light-adjusting layer 12a and the third light-adjusting layer 12c, and thus the light extraction effect of the second light extraction structure 24b is better than that of the second light extraction structure 24a, which is conducive to further improving the overall display brightness of the display panel 10b on the basis of reducing or eliminating the display brightness difference between the light-transmitting area 13 and the display area 14, and is conducive to further improving the display effect.

[0107] As shown in FIG. 4 and FIG. 9, the embodiment of the present application further provides a display panel 10c, which is different from the foregoing embodiments in that the first light-adjusting layer 12a and the second light-adjusting layer 12b are only located in the light-transmitting area 13, the third light-adjusting layer 12c extends from the light-transmitting area 13 to the display area 14 and covers the display substrate 11 located in the display area 14, and the distances between different positions of the side of the third light-adjusting layer 12c away from the display substrate 11 and the display substrate 11 are the same. That is, the side of the third light-adjusting layer 12c away from the display substrate 11 located in the light-transmitting area 13 and the display area 14 is flat, which can play a role in flattening and protecting the display substrate 11 in the display area 14, and is conducive to the subsequent film layer manufacturing.

[0108] It can be understood that in the embodiment of the present application, the first light extraction structure 22 is only formed in the light-transmitting area 13, and the light-adjusting function layer 12 has no light-adjusting function for the display area 14, that is, the light-adjusting function layer 12 has no display brightness adjusting function for the display area 14.

[0109] The embodiment of the present application only improves the display brightness of the light-transmitting area 13 by improving the light extraction rate of the light-transmitting area 13, so that the brightness difference between the light-transmitting area 13 and the display area 14 is reduced or eliminated, which can save material cost on the one hand and improve the overall display effect of the display panel 10c on the other hand.

[0110] As shown in FIG. 4 and FIG. 10, the embodiment of the present application further provides a display panel 10d, which is different from the foregoing embodiments in that the first light-adjusting layer 12a extends from the light-transmitting area 13 to the display area 14 and includes a plurality of second light-transmitting holes 25 arranged one by one with the plurality of second sub-pixels 16; the second light-transmitting hole 25 includes a second side wall 25a and a second bottom 25b, and the included angle θ2 between the second side wall 25a and the second bottom 25b is greater than 90° and less than 180°; and the third light-adjusting layer 12c further covers the side of the first light-adjusting layer 12a away from the display substrate 11 and fills in the second light-transmitting hole 25.

[0111] It can be understood that the first light-adjusting layer 12a and the third light-adjusting layer 12c are located in the light-transmitting area 13 and the display area 14, and the second light-adjusting layer 12b is only located in the light-transmitting area 13. At this time, the third light-adjusting layer 12c also covers the first light-adjusting layer 12a away from the display substrate 11 on the second side wall 25a and the second bottom 25b in the display area 14; that is, the third light-adjusting layer 12c is arranged in the second light-transmitting hole 25 and is attached to the first light-adjusting layer 12a and the display substrate 11.

[0112] In some embodiments, the third light-adjusting layer 12c is continuously arranged in the light-transmitting area 13 and the display area 14, and the distances between the third light-adjusting layer 12c and the display substrate 11 at different positions away from the display substrate 11 are all the same. This design is beneficial to simplify the manufacturing process of the third light-adjusting layer 12c and improve the flatness of the film surface.

[0113] Specifically, the first light-adjusting layer 12a and the third light-adjusting layer 12c in the display area 14 constitute the second light-extracting structure 24c. It can be understood that the first light-extracting structure 22 has an additional second light-adjusting layer 12b with a smaller refractive index compared with the second light-extracting structure 24c.

[0114] When the second sub-pixel 16 in the display area 14 emits light, the following light paths are included: a part of the light rays with large viewing angles incident in the direction of the second side wall 25a are totally reflected on the contact interface between the first light-adjusting layer 12a and the third light-adjusting layer 12c and then emitted from the direction close to the normal viewing angle; another part of the light rays with large viewing angles incident in the direction of the second bottom 25b are refracted on the contact interface between the first light-adjusting layer 12a and the third light-adjusting layer 12c and then emitted from the direction close to the normal viewing angle. Therefore, the second light-extracting structure 24c in the display area 14 can convert the light rays with large viewing angles in the display area 14 into light rays with normal viewing angles to a certain extent, thereby improving the display brightness of the display area 14.

[0115] However, since the total reflection interface of the second light-extracting structure 24c is the contact surface between the first light-adjusting layer 12a and the third light-adjusting layer 12c, and the total reflection interface of the first light-extracting structure 22 is the contact surface between the second light-adjusting layer 12b and the third light-adjusting layer 12c, and the refractive index of the second light-adjusting layer 12b is smaller than that of the first light-adjusting layer 12a, the refractive index difference between the second light-adjusting layer 12b and the third light-adjusting layer 12c is larger, which can more effectively convert the light rays with large viewing angles into light rays with normal viewing angles. Therefore, the light extraction effect of the first light-extracting structure 22 is better than that of the second light-extracting structure 24c.

[0116] And, due to the existence of the interface between the first light modulation layer 12a and the second light modulation layer 12b in the first light extraction structure 22, the part of the large viewing angle light rays incident in the direction of the first side wall 21a is refracted at the contact interface between the third light modulation layer 12c and the second light modulation layer 12b, then is reflected at the contact interface between the first light modulation layer 12a and the second light modulation layer 12b, then is refracted at the contact interface between the second light modulation layer 12b and the third light modulation layer 12c, and finally is emitted in the direction close to the normal viewing angle, which further improves the light extraction effect of the first light extraction structure 22.

[0117] Of course, in other embodiments, the second light modulation layer 12b can also be arranged in the display area 14, at this time, the second light modulation layer 12b is arranged in the display area 14 only on the side of the first light modulation layer 12a away from the display substrate 11 and on the second bottom 25b of the second light transmission hole 25, and the third light modulation layer 12c covers the side of the second light modulation layer 12b in the display area 14 away from the display substrate 11 and the second side wall 25a of the second light transmission hole 25. That is, the second light modulation layer 12b in the display area 14 is discontinuously arranged on the upper surface of the first light modulation layer 12a and the second bottom 25b of the second light transmission hole 25, that is, the second light modulation layer 12b in the display area 14 is arranged in the area outside the second side wall 25a. The embodiments of the present application can continuously form the residual layer in the display area 14 only on the side of the first light modulation layer 12a away from the display substrate 11 and on the second bottom 25b of the second light transmission hole 25 by pasting a protective layer (TPF) with a glue layer on the entire first light modulation layer 12a and only performing defoaming treatment on the glue layer of the protective layer in the light transmission area 13, but not performing defoaming treatment on the glue layer of the protective layer in the display area 14.

[0118] In some embodiments, the included angle θ1 between the first side wall 21a and the first bottom 21b is equal to the included angle θ2 between the second side wall 25a and the second bottom 25b. That is, the first light transmission hole 21 and the second light transmission hole 25 have the same shape, that is, the taper angle of the opening of the first light modulation layer 12a is the same. This design makes the openings on the first light modulation layer 12a in the light transmission area 13 and the display area 14 can be formed in the same process, which is beneficial to simplify the manufacturing process of the first light modulation layer 12a.

[0119] Of course, in other embodiments, the included angle θ1 between the first side wall 21a and the first bottom 21b is smaller than the included angle θ2 between the second side wall 25a and the second bottom 25b, so that the Taper angle of the first light modulation layer 12a at the first light transmission hole 21 is greater than the Taper angle at the second light transmission hole 25. This design makes a larger range of large viewing angle light rays be totally reflected at the total reflection interface (i.e., the contact interface of the second light modulation layer 12b and the third light modulation layer 12c) in the area where the first side wall 21a of the first light transmission hole 21 is located, and the exit direction of the light rays after being totally reflected at the total reflection interface in the area where the first side wall 21a is located is closer to the normal viewing angle direction. Therefore, when θ1 is smaller than θ2, the display brightness of the light transmission area 13 can be more effectively improved, i.e., the difference in light extraction effect between the first light extraction structure 22 and the second light extraction structure 24c is further increased, and the difference in display brightness between the light transmission area 13 and the display area 14 can be more effectively reduced or eliminated.

[0120] In some embodiments, the included angle θ1 between the first side wall 21a and the first bottom 21b is greater than or equal to 100° and less than or equal to 110°, and the included angle θ2 between the second side wall 25a and the second bottom 25b is greater than or equal to 120° and less than 180°.

[0121] In the embodiments of the present application, by arranging the light modulation functional layer 12 on the light-emitting side of the display substrate 11 having the light transmission area 13 and the display area 14 with different light transmission rates, the light modulation functional layer 12 includes the first light extraction structure 22 located in the light transmission area 13 and the second light extraction structure 24c located in the display area 14, and the light extraction effect of the first light extraction structure 22 on the light transmission area 13 with a larger light transmission rate is better than the light extraction effect of the second light extraction structure 24c on the display area 14 with a smaller light transmission rate. On the one hand, the display brightness of the light transmission area 13 and the display area 14 can be improved at the same time, thereby improving the overall display brightness of the display panel 10d. On the other hand, the difference in display brightness between the light transmission area 13 and the display area 14 is effectively reduced or eliminated by the differential light extraction effect, which is beneficial to improving the overall display effect of the display panel 10d. Therefore, the embodiments of the present application can effectively improve the overall display brightness and the overall display effect of the display panel 10d.

[0122] As shown in FIG. 4 and FIG. 11, the embodiment of the present application further provides a display panel 10e, which is different from the foregoing embodiments in that the first light-adjusting layer 12a and the second light-adjusting layer 12b extend from the light-transmitting area 13 to the display area 14; the first light-adjusting layer 12a further comprises a plurality of second light-transmitting holes 25 arranged one-to-one with the plurality of second sub-pixels 16; the second light-transmitting hole 25 comprises a second side wall 25a and a second bottom 25b, and the included angle θ2 between the second side wall 25a and the second bottom 25b is greater than 90° and less than 180°; the second light-adjusting layer 12b further continuously covers the side of the first light-adjusting layer 12a away from the display substrate 11, the second side wall 25a and the second bottom 25b in the display area 14; the third light-adjusting layer 12c covers the side of the second light-adjusting layer 12b away from the display substrate 11 and fills in the second light-transmitting hole 25; the included angle θ1 between the first side wall 21a and the first bottom 21b is less than the included angle θ2 between the second side wall 25a and the second bottom 25b.

[0123] It can be understood that the first light-adjusting layer 12a, the second light-adjusting layer 12b and the third light-adjusting layer 12c are all located in the light-transmitting area 13 and the display area 14.

[0124] Specifically, the first light-adjusting layer 12a, the second light-adjusting layer 12b and the third light-adjusting layer 12c in the display area 14 constitute the second light extraction structure 24d.

[0125] Due to the included angle θ1 between the first side wall 21a and the first bottom 21b being less than the included angle θ2 between the second side wall 25a and the second bottom 25b, the Taper angle of the first light-adjusting layer 12a at the first light-transmitting hole 21 is greater than the Taper angle at the second light-transmitting hole 25, so that the Taper angle of the second light-adjusting layer 12b at the first light-transmitting hole 21 is greater than the Taper angle at the second light-transmitting hole 25.

[0126] As shown in FIG. 12, the Taper angle of the second light-adjusting layer 12b on the first sidewall of the first light-transmitting hole is θ3, and it is obvious that θ3 is the supplementary angle of θ1. As shown in FIG. 13, the Taper angle of the second light-adjusting layer 12b on the second sidewall of the second light-transmitting hole is θ4, and it is obvious that θ4 is the supplementary angle of θ2. In combination with FIGS. 11-13, since θ1 is less than θ2, θ3 is greater than θ4, that is, the slope of the second light-adjusting layer 12b on the first sidewall 21a of the first light-transmitting hole 21 is steeper than the slope of the second light-adjusting layer 12b on the second sidewall 25a of the second light-transmitting hole 25. This design makes a larger range of large-view-angle light rays be totally reflected at the total reflection interface (i.e., the contact interface between the second light-adjusting layer 12b and the third light-adjusting layer 12c) in the area where the first sidewall 21a is located, and the exit direction of the light rays after being totally reflected at the total reflection interface in the area where the first sidewall 21a is located is closer to the normal-view-angle direction. Therefore, when θ1 is less than θ2, the display brightness of the light-transmitting area 13 can be more effectively improved.

[0127] In some embodiments, the Taper angle θ3 of the second light-adjusting layer 12b on the first sidewall of the first light-transmitting hole is greater than or equal to 70° and less than or equal to 80°, and the Taper angle θ4 of the second light-adjusting layer 12b on the second sidewall of the second light-transmitting hole is greater than 0° and less than or equal to 60°.

[0128] Although the first light-adjusting layer 12a is provided with the second light-transmitting hole 25 in the display area 14 and the second light-adjusting layer 12b is also provided in the display area 14, since the Taper angle θ3 of the second light-adjusting layer 12b at the first light-transmitting hole 21 is greater than the Taper angle θ4 at the second light-transmitting hole 25, the light extraction effect of the first light extraction structure 22 is better than that of the second light extraction structure 24d, and the difference between the display brightness of the light-transmitting area 13 and the display brightness of the display area 14 can be effectively reduced or eliminated.

[0129] It can be understood that, since the display area 14 is further provided with the second light-adjusting layer 12b on the basis of the second light-transmitting hole 25, the display brightness of the display area 14 can be further improved, thereby further improving the overall display brightness of the display panel 10e. At the same time, by differentiating the inclination of the sidewalls of the first light-transmitting hole 21 and the second light-transmitting hole 25, the display brightness of the light-transmitting area 13 is increased more than the display brightness of the display area 14, thereby effectively reducing or eliminating the difference between the two.

[0130] Of course, in addition to differentiating the inclination of the sidewalls of the first light-transmitting hole 21 and the second light-transmitting hole 25, the refractive index of the third light-adjusting layer 12c in the light-transmitting area 13 and the display area 14 can also be differentiated.

[0131] For example, for the display panel 10e shown in FIG. 11, the refractive index of the second light-adjusting layer 12b located in the light-transmitting area 13 and the display area 14 is the same, and the refractive index of the third light-adjusting layer 12c located in the light-transmitting area 13 is greater than the refractive index of the third light-adjusting layer 12c located in the display area 14, so that the refractive index difference between the second light-adjusting layer 12b and the third light-adjusting layer 12c in the light-transmitting area 13 is greater than the refractive index difference between the second light-adjusting layer 12b and the third light-adjusting layer 12c in the display area 14, thereby making the light extraction effect of the first light extraction structure 22 located in the light-transmitting area 13 better than the light extraction effect of the second light extraction structure 24d located in the display area 14.

[0132] Specifically, the difference in the refractive index of the third light-adjusting layer 12c in the light-transmitting area 13 and the display area 14 can be realized by differentiating the material of the third light-adjusting layer 12c in the light-transmitting area 13 and the display area 14. For example, in a specific embodiment, the amount of functional particles added to the third light-adjusting layer 12c in the light-transmitting area 13 is greater than the amount of functional particles added to the third light-adjusting layer 12c in the display area 14, or the refractive index of the functional particles added to the third light-adjusting layer 12c in the light-transmitting area 13 is greater than the refractive index of the functional particles added to the third light-adjusting layer 12c in the display area 14. In the above two embodiments, the material of the optical adhesive base material in the third light-adjusting layer 12c can remain the same, which is conducive to simplifying the process.

[0133] It can be understood that the scheme of differentiating the inclination of the side wall of the first light-transmitting hole 21 and the second light-transmitting hole 25 and the scheme of differentiating the refractive index of the third light-adjusting layer 12c located in the light-transmitting area 13 and the display area 14 can be independently implemented in two embodiments respectively, or can be simultaneously implemented in the same embodiment, and the present application does not limit this.

[0134] In the embodiments of the present application, by arranging the light-adjusting functional layer 12 on the light-emitting side of the display substrate 11 having the light-transmitting area 13 and the display area 14 with different light-transmitting rates, the light-adjusting functional layer 12 includes the first light extraction structure 22 located in the light-transmitting area 13 and the second light extraction structure 24d located in the display area 14, and the light extraction effect of the first light extraction structure 22 on the light-transmitting area 13 with a larger light-transmitting rate is better than the light extraction effect of the second light extraction structure 24d on the display area 14 with a smaller light-transmitting rate; on the one hand, the display brightness of the light-transmitting area 13 and the display area 14 can be simultaneously improved, thereby improving the overall display brightness of the display panel 10e, and on the other hand, the difference in the display brightness of the light-transmitting area 13 and the display area 14 is effectively reduced or eliminated through the differentiated light extraction effect. Therefore, the embodiments of the present application can effectively improve the overall display brightness and overall display effect of the display panel 10e.

[0135] As shown in FIG. 14, the embodiment of the present application further provides a display device 26, which comprises an optical sensor 27 and a display panel 10, and the display panel 10 is the display panel described in any one of the above embodiments. The optical sensor 27 is arranged on the side of the display substrate 11 away from the light-adjusting functional layer 12 and corresponds to the light-transmitting area 13.

[0136] Specifically, the light-transmitting area 13 of the display panel 10 is a CUP area, and the display area 14 is an AA area. The CUP area can provide sufficient light for the optical sensor 27 to improve the sensitivity of the optical sensor 27, and can also be used for display to realize full-screen display.

[0137] Specifically, the optical sensor 27 includes but is not limited to a camera, an infrared sensor, an ambient light sensor or a fingerprint recognizer.

[0138] In the embodiment of the present application, since the light transmittance of the light-transmitting area 13 of the display panel 10 is greater than that of the display area 14, it is beneficial to improve the light transmitted through the light-transmitting area 13, so that the optical sensor 27 can receive more light, thereby improving the sensitivity of the optical sensor 27; at the same time, due to the arrangement of the light-adjusting functional layer 12, the difference in display brightness between the light-transmitting area 13 and the display area 14 is effectively reduced or eliminated, thereby improving the overall display effect of the display panel 10. Therefore, the embodiment of the present application can improve the sensitivity of the optical sensor 27 while improving the display effect of the display device 26.

[0139] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0140] The above describes in detail the display panel and the display device provided by the embodiment of the present application, and the principle and implementation manner of the present application are described by applying specific examples; the above embodiment is only used to help understand the technical solution and the core idea of the present application; those skilled in the art should understand that the technical solution recorded in the above embodiments can be modified or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A display panel comprising a display substrate and a light-adjusting functional layer located on the light-emitting side of the display substrate; the display substrate has a light-transmitting region and a display region arranged adjacently, and the light-transmitting region has a higher light transmittance than the display region; the display substrate comprises a plurality of first sub-pixels located in the light-transmitting region and a plurality of second sub-pixels located in the display region; the light-adjusting functional layer comprises a first light-adjusting layer, a second light-adjusting layer and a third light-adjusting layer stacked on the display substrate; the first light-adjusting layer is located at least in the light-transmitting region and comprises a plurality of first light-transmitting holes arranged one-to-one with the plurality of first sub-pixels; the first light-transmitting hole comprises a first side wall and a first bottom, and the included angle between the first side wall and the first bottom is greater than 90° and less than 180°; the second light-adjusting layer is at least continuously covered on the side of the first light-adjusting layer located in the light-transmitting region away from the display substrate, the first side wall and the first bottom; the third light-adjusting layer is at least covered on the second light-adjusting layer and filled in the first light-transmitting hole; wherein the refractive index of the first light-adjusting layer is greater than that of the second light-adjusting layer, and the refractive index of the first light-adjusting layer is less than that of the third light-adjusting layer.

2. The display panel of claim 1, wherein, The first light-adjusting layer and the third light-adjusting layer both extend from the light-transmitting region to cover the display region, and the distance between different positions of the side of the third light-adjusting layer away from the display substrate and the display substrate is the same.

3. The display panel of claim 2, wherein, The second light-adjusting layer extends from the light-transmitting region to cover the display region; the first light-adjusting layer located in the display region is entirely covered on the display substrate, the second light-adjusting layer is also continuously covered on the first light-adjusting layer located in the display region, and the third light-adjusting layer is also covered on the second light-adjusting layer located in the display region.

4. The display panel of claim 1, wherein, The first light-adjusting layer extends from the light-transmitting region to the display region and comprises a plurality of second light-transmitting holes arranged one-to-one with the plurality of second sub-pixels; the second light-transmitting hole comprises a second side wall and a second bottom, and the included angle between the second side wall and the second bottom is greater than 90° and less than 180°; the third light-adjusting layer is also covered on the side of the first light-adjusting layer located in the display region away from the display substrate and filled in the second light-transmitting hole.

5. The display panel of claim 4, wherein, The included angle between the first side wall and the first bottom is less than or equal to the included angle between the second side wall and the second bottom.

6. The display panel of claim 4, wherein, The second light-adjusting layer is located only in the light-transmitting region; the third light-adjusting layer is also covered on the side of the first light-adjusting layer located in the display region away from the display substrate, the second side wall and the second bottom.

7. The display panel of claim 4, wherein, The second light-adjusting layer is also located in the display region, and the second light-adjusting layer is also arranged on the side of the first light-adjusting layer located in the display region away from the display substrate and the second bottom; the third light-adjusting layer is also covered on the side of the second light-adjusting layer located in the display region away from the display substrate and the second side wall.

8. The display panel of claim 4, wherein, The second light-adjusting layer extends from the light-transmitting area to the display area; the second light-adjusting layer also continuously covers the side of the first light-adjusting layer in the display area, the second side wall and the second bottom away from the display substrate; the third light-adjusting layer covers the side of the second light-adjusting layer away from the display substrate. The included angle between the first side wall and the first bottom is smaller than the included angle between the second side wall and the second bottom.

9. The display panel of claim 4, wherein, The second light-adjusting layer extends from the light-transmitting area to the display area; the second light-adjusting layer also continuously covers the side of the first light-adjusting layer in the display area, the second side wall and the second bottom away from the display substrate; the third light-adjusting layer covers the side of the second light-adjusting layer away from the display substrate. The refractive index of the second light-adjusting layer in the light-transmitting area and the display area is the same, and the refractive index of the third light-adjusting layer in the light-transmitting area is greater than the refractive index of the third light-adjusting layer in the display area.

10. The display panel of claim 1, wherein, The thickness of the second light-adjusting layer in different positions is consistent, and the thickness of the second light-adjusting layer ranges from 50 nanometers to 200 nanometers.

11. The display panel of claim 1, wherein, The refractive index of the first light-adjusting layer ranges from 1.48 to 1.54, the refractive index of the second light-adjusting layer ranges from 1.48 to 1.52, and the refractive index of the third light-adjusting layer ranges from 1.55 to 1.

65.

12. The display panel of claim 1 or 11, wherein, In the light-adjusting functional layer, at least the materials of the second light-adjusting layer and the third light-adjusting layer are glue materials, and the materials of the second light-adjusting layer and the third light-adjusting layer are different.

13. The display panel of claim 12, wherein, The material of the second light-adjusting layer includes polyurethane or thermoplastic polyurethane rubber.

14. The display panel of claim 12, wherein, The material of the third light-adjusting layer includes optical glue and functional particles added in the optical glue, the refractive index of the functional particles is greater than the refractive index of the optical glue, and is greater than the refractive index of the second light-adjusting layer.

15. The display panel of claim 12, wherein, The material of the third light-adjusting layer contains an acrylic double bond functional group and a benzene ring functional group.

16. The display panel of claim 13, wherein, The material of the third light-adjusting layer contains a small molecule polar functional group which is attracted to the polyurethane.

17. The display panel of claim 12, wherein, The display panel further includes a polarizing functional layer on the side of the third light-adjusting layer away from the display substrate, and the third light-adjusting layer is attached to the polarizing functional layer.

18. The display panel of claim 1, wherein, The display substrate includes an array substrate, a light-emitting layer, an encapsulation layer and a touch layer which are stacked on the array substrate, the light-adjusting functional layer is located on the side of the touch layer away from the encapsulation layer; the first sub-pixel and the second sub-pixel are located in the light-emitting layer.

19. A display device comprising an optical sensor and a display panel, the display panel comprising a display substrate and a light-adjusting functional layer on the light-emitting side of the display substrate; the display substrate has a light-transmitting area and a display area arranged adjacent to each other, and the light-transmitting area has a light transmittance greater than that of the display area; the display substrate comprises a plurality of first sub-pixels in the light-transmitting area and a plurality of second sub-pixels in the display area. The light-adjusting function layer comprises a first light-adjusting layer, a second light-adjusting layer and a third light-adjusting layer which are stacked on the display substrate; the first light-adjusting layer is located at least in the light-transmitting area and comprises a plurality of first light-transmitting holes which are arranged one by one with the plurality of first sub-pixels; the first light-transmitting hole comprises a first side wall and a first bottom, and an included angle between the first side wall and the first bottom is greater than 90° and less than 180°; the second light-adjusting layer is at least continuously covered on the side of the first light-adjusting layer located in the light-transmitting area and away from the display substrate, the first side wall and the first bottom; the third light-adjusting layer is at least covered on the second light-adjusting layer and filled in the first light-transmitting hole; The refractive index of the first light-adjusting layer is greater than the refractive index of the second light-adjusting layer, and the refractive index of the first light-adjusting layer is less than the refractive index of the third light-adjusting layer; The optical sensor is located on the side of the display substrate away from the first light-adjusting layer and is arranged corresponding to the light-transmitting area.

20. The display device of claim 19, wherein, The optical sensor comprises any one of a camera, an infrared sensor, an ambient light sensor and a fingerprint recognizer.

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