Display panel and electronic device

Abstract

The application provides a display panel and an electronic device. The display panel drive circuit layer comprises a plurality of pixel drive circuits and a light sensing sensor arranged between adjacent pixel drive circuits. A first electrode is electrically connected with the pixel drive circuit. A pixel definition layer is provided with a first opening at a position corresponding to the first electrode and a second opening at a position corresponding to the light sensing sensor. A second electrode layer is provided with a third opening at a position corresponding to the second opening. A metal inhibition layer is arranged corresponding to the third opening and laid in the second opening. An encapsulation layer covers the metal inhibition layer and fills into the second opening. The refractive index of the encapsulation layer is greater than the refractive index of the metal inhibition layer. The application sets the second opening on the pixel definition layer to enable the light to pass through the pixel definition layer to the light sensing sensor, thereby relieving the problem that the existing under-screen optical fingerprint is difficult to be directly applied to the OLED product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display panel and an electronic device. BACKGROUND

[0002] With the development of display technology, a variety of display devices with fingerprint identification function appear in the market, such as mobile phones, tablet computers and smart wearable devices. Common fingerprint identification methods mainly include under-screen optical fingerprint identification and under-screen ultrasonic fingerprint identification, among which under-screen optical fingerprint identification becomes the market mainstream due to price advantage. When under-screen optical fingerprint identification is applied to an organic light-emitting diode (OLED) display device, the imaging effect of under-screen optical fingerprint is affected due to the poor light transmission of the pixel definition layer, making it difficult for under-screen optical fingerprint to be directly applied in OLED products. SUMMARY

[0003] The present application provides a display panel and an electronic device to alleviate the technical problem that the current under-screen optical fingerprint is difficult to be directly applied in OLED products.

[0004] To solve the above problems, the technical scheme provided by the present application is as follows:

[0005] The present application provides a display panel, which comprises:

[0006] a substrate;

[0007] a driving circuit layer disposed on one side of the substrate, the driving circuit layer comprising a plurality of pixel driving circuits and a light sensing sensor disposed between adjacent pixel driving circuits;

[0008] a first electrode layer disposed on a side of the driving circuit layer away from the substrate, the first electrode layer comprising a plurality of first electrodes, the first electrodes being electrically connected to corresponding pixel driving circuits;

[0009] a pixel definition layer disposed on a side of the first electrode layer away from the substrate, the pixel definition layer comprising a plurality of first openings corresponding to the first electrodes and a second opening corresponding to the light sensing sensor;

[0010] a light emitting layer disposed on a side of the pixel definition layer away from the substrate;

[0011] a second electrode layer disposed on a side of the light emitting layer away from the substrate, the second electrode layer comprising a third opening corresponding to the second opening;

[0012] a metal inhibition layer disposed corresponding to the third opening and laid in the second opening;

[0013] a packaging layer disposed on a side of the second electrode layer distal from the substrate, the packaging layer also covering the metal inhibition layer and filling into the second opening;

[0014] wherein a refractive index of the packaging layer is greater than a refractive index of the metal inhibition layer.

[0015] In the display panel provided by the embodiment of the present application, an included angle between a sidewall of the second opening and a bottom surface of the second opening close to the substrate is greater than 90 degrees.

[0016] The metal inhibition layer covers at least the sidewall of the second opening.

[0017] In the display panel provided by the embodiment of the present application, the packaging layer comprises a first inorganic packaging sub-layer, an organic packaging sub-layer and a second inorganic packaging sub-layer which are sequentially stacked.

[0018] The first inorganic packaging sub-layer is in surface contact with a side of the metal inhibition layer distal from the substrate, and a refractive index of the first inorganic packaging sub-layer is greater than a refractive index of the metal inhibition layer.

[0019] In the display panel provided by the embodiment of the present application, the display panel further comprises:

[0020] a color filter layer disposed on a side of the touch layer distal from the substrate, the color filter layer comprising: a light shielding portion and a light filtering portion, the light shielding portion comprising: a fourth opening corresponding to the first opening and a fifth opening corresponding to the second opening, the light filtering portion corresponding to the fourth opening.

[0021] In the display panel provided by the embodiment of the present application, the pixel definition layer comprises black pigment, the second opening and the fifth opening have the same shape, and the second opening and the fifth opening have the same size.

[0022] In the display panel provided by the embodiment of the present application, a bottom surface of the second opening close to the substrate and a bottom surface of the fifth opening close to the substrate have the same shape, and a size of the bottom surface of the second opening close to the substrate and a size of the bottom surface of the fifth opening close to the substrate are the same.

[0023] In the display panel provided by the embodiment of the present application, the display panel further comprises:

[0024] a touch layer disposed on a side of the packaging layer distal from the substrate, the touch layer comprising a touch electrode sub-layer, the touch electrode sub-layer comprising a sixth opening corresponding to the second opening.

[0025] In the display panel provided in this application embodiment, the second opening has the same shape as the sixth opening, and the size of the second opening is less than or equal to the size of the sixth opening.

[0026] In the display panel provided in this application embodiment, a portion of the film layer of the light sensor and a portion of the film layer of the driving circuit are disposed on the same layer.

[0027] This application also provides an electronic device that includes a display panel from one of the foregoing embodiments.

[0028] The beneficial effects of this application are as follows: In the display panel and electronic device provided by this application, the driving circuit layer of the display panel includes multiple pixel driving circuits and a photosensitive sensor disposed between adjacent pixel driving circuits. A first electrode is electrically connected to the pixel driving circuit. A pixel definition layer has a first opening at the position corresponding to the first electrode and a second opening at the position corresponding to the photosensitive sensor. A second electrode layer has a third opening at the position corresponding to the second opening. A metal suppression layer is disposed corresponding to the third opening and is laid in the second opening. An encapsulation layer covers the metal suppression layer and fills the second opening. The refractive index of the encapsulation layer is greater than that of the metal suppression layer. This application solves the problem that existing under-display optical fingerprints are difficult to directly apply to OLED products by setting a second opening on the pixel definition layer so that light can pass through the pixel definition layer to reach the photosensitive sensor. At the same time, the low refractive index metal suppression layer is disposed in the second opening and cooperates with the high refractive index encapsulation layer to converge the fingerprint reflected light toward the receiving surface of the photosensitive sensor, thereby increasing the amount of light reaching the receiving surface of the photosensitive sensor, thereby improving the clarity of the formed optical fingerprint pattern and thus improving the accuracy of fingerprint recognition. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a top view of a display panel provided in an embodiment of this application.

[0031] Figure 2 This is a cross-sectional structural diagram of a display panel provided in an embodiment of this application.

[0032] Figure 3 for Figure 2 A detailed structural diagram of the second opening in the middle.

[0033] Figure 4 This is a schematic diagram of another cross-sectional structure of the display panel provided in an embodiment of this application.

[0034] Figure 5 for Figure 4 A detailed structural diagram of the second opening in the middle.

[0035] Figure 6 This is a schematic cross-sectional view of another display panel provided in an embodiment of this application.

[0036] Figure 7 This is a schematic diagram illustrating the principle of total internal reflection at the interface between the metal suppression layer and the encapsulation layer, as provided in an embodiment of this application. Detailed Implementation

[0037] The following descriptions of the embodiments are based on the accompanying illustrations, illustrating specific embodiments in which this application can be implemented. Directional terms used in this application, such as [up], [down], [front], [back], [left], [right], [inner], [outer], [side], etc., are merely for reference to the accompanying drawings. Therefore, the directional terms used are for illustration and understanding of this application, and not for limiting this application. In the figures, structurally similar units are denoted by the same reference numerals. In the figures, the thickness of some layers and regions is exaggerated for clarity and ease of description. That is, the dimensions and thicknesses of each component shown in the figures are arbitrarily shown, but this application is not limited thereto.

[0038] Please refer to the reference. Figures 1 to 3 , Figure 1 This is a top view of a display panel provided in an embodiment of this application. Figure 2 This is a cross-sectional structural diagram of a display panel provided in an embodiment of this application. Figure 3 for Figure 2 A detailed structural diagram of the second opening in the middle. (See diagram below.) Figure 1 As shown, the display panel 100 includes a plurality of sub-pixels SP arranged in an array and a light sensor 3 located between adjacent sub-pixels SP. The sub-pixels SP include a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B. The red sub-pixel R emits red light, the green sub-pixel G emits green light, and the blue sub-pixel B emits blue light. Every three adjacent sub-pixels SP of different colors constitute a pixel P.

[0039] There is a gap between each pair of adjacent sub-pixels SP. The light sensor 3 is disposed within the gap between the two adjacent sub-pixels SP, so that the light sensor 3 is integrated into the display panel 100 without affecting the normal display of the display panel 100. By integrating the light sensor 3 into the display panel 100 in this way, functions such as fingerprint recognition, palm print recognition, and distance detection can be realized. This embodiment of the application uses fingerprint recognition as an example. It can be understood that when the light sensor 3 is integrated into the entire surface of the display panel 100, large-area fingerprint recognition or full-screen fingerprint recognition can be realized.

[0040] like Figure 2 As shown, the display panel 100 further includes a substrate 10 and a driving circuit layer 20 disposed on one side of the substrate 10. The driving circuit layer 20 includes a plurality of pixel driving circuits 2 and the light sensor 3. Each sub-pixel SP includes at least one pixel driving circuit 2, and the light sensor 3 is disposed between adjacent pixel driving circuits 2. Of course, the location of the light sensor 3 in this application is not limited to this. The light sensor 3 in this application can also be disposed on the side of the substrate 10 away from the pixel driving circuit 2. However, when the light sensor 3 and the pixel driving circuit 2 are located on the same side of the substrate 10, the thickness of the display panel 100 can be reduced.

[0041] Optionally, the substrate 10 can be a rigid substrate or a flexible substrate; when the substrate 10 is a rigid substrate, it can include rigid substrates such as glass substrates; when the substrate 10 is a flexible substrate, it can include flexible substrates such as polyimide (PI) film and ultra-thin glass film. When the substrate 10 is a flexible substrate, the display panel 100 can realize functions such as bending, folding and turning.

[0042] Continue to refer to Figure 2 The pixel driving circuit 2 is disposed on the substrate 10. Optionally, a buffer layer 11 may be disposed between the pixel driving circuit 2 and the substrate 10. The buffer layer 11 may be a silicon oxide film, a silicon nitride film, or a multilayer comprising a silicon oxide film and a silicon nitride film. The buffer layer 11 can prevent unwanted impurities or contaminants (such as moisture, oxygen, etc.) from diffusing from the substrate 10 into the device that may be damaged by these impurities or contaminants, while also providing a flat top surface.

[0043] The pixel driving circuit 2 includes an active layer 21, a first gate 22, a second gate 23, a first source 24, and a first drain 25. To insulate the metal layers in the pixel driving circuit 2 from each other, the display panel 100 also includes multiple insulating layers. Specifically, the active layer 21 is disposed on the buffer layer 11, and a first gate insulating layer 12 covers the active layer 21 and the buffer layer 11. The first gate 22 is disposed on the first gate insulating layer 12, and a second gate insulating layer 13 covers the first gate 22 and the first gate insulating layer 12. The second gate 23 is disposed on the second gate insulating layer 13, and a stacked interlayer insulating layer 14, a first passivation layer 15, and a second passivation layer 16 covers the second gate 23 and the second gate insulating layer 13.

[0044] The first gate 22 and the second gate 23 are disposed corresponding to the channel of the active layer 21. The first gate 22 and the second gate 23 are formed of a metallic material, and the first gate insulating layer 12, the second gate insulating layer 13, the interlayer insulating layer 14, the first passivation layer 15 and the second passivation layer 16 are all formed of inorganic materials such as silicon oxide or silicon nitride.

[0045] The first source electrode 24 and the first drain electrode 25 are disposed on the second passivation layer 16. The first source electrode 24 is electrically connected to the source region on one side of the channel of the active layer 21, and the first drain electrode 25 is electrically connected to the drain region on the other side of the channel of the active layer 21. The source region and the drain region are located on opposite sides of the channel. A first planarization layer 17 covers the first source electrode 24, the first drain electrode 25, and the second passivation layer 16. The first source electrode 24 and the first drain electrode 25 are formed of a metallic material, and the first planarization layer 17 is formed of an organic material to better flatten the undulating terrain of the pixel driving circuit 2 and provide a better flat surface.

[0046] Optionally, a portion of the film layer of the photosensor 3 is disposed on the same layer as a portion of the film layer of the pixel driving circuit 2, so that the photosensor 3 and the pixel driving circuit 2 are formed under the same process conditions, simplifying the process flow. Specifically, the photosensor 3 includes a lower electrode 27, an upper electrode 28, and an intrinsic semiconductor layer 29 disposed between the lower electrode 27 and the upper electrode 28. The lower electrode 27 is disposed on the same layer as the second gate 23. Of course, this application is not limited to this; the lower electrode 27 of this application may also be disposed on the same layer as other metal layers of the pixel driving circuit 2, such as the first gate 22.

[0047] It should be noted that, in this application, "co-layer arrangement" refers to the process in which at least two different structures are obtained by patterning a film layer formed of the same material during the fabrication process, and the at least two different structures are arranged in the same layer. For example, in this embodiment, the lower electrode 27 and the second gate 23 are obtained by patterning the same conductive film layer, and therefore the lower electrode 27 and the second gate 23 are arranged in the same layer.

[0048] The interlayer insulating layer 14 has a first opening at a position corresponding to the lower electrode 27, exposing the lower electrode 27. The intrinsic semiconductor layer 29 fills the first opening and covers the lower electrode 27. The first passivation layer 15 has a second opening at a position corresponding to the intrinsic semiconductor layer 29, exposing the intrinsic semiconductor layer 29. The upper electrode 28 fills the second opening and covers the intrinsic semiconductor layer 29. The material of the upper electrode 28 includes transparent conductive materials such as indium tin oxide (ITO).

[0049] Furthermore, continue to refer to Figure 2 The display panel 100 further includes a light-emitting functional layer 30 located on the side of the driving circuit layer 20 away from the substrate 10. The light-emitting functional layer 30 includes a first electrode layer, a second electrode layer 32, and a light-emitting layer 33 disposed between the first electrode layer and the second electrode layer 32.

[0050] The first electrode layer is disposed on the side of the driving circuit layer 20 away from the substrate 10. The first electrode layer includes a plurality of first electrodes 31, and the first electrodes 31 are electrically connected to the corresponding pixel driving circuits 2. Specifically, the first electrodes 31 are disposed on the first planarization layer 17 and are electrically connected to the first drain 25 through vias in the first planarization layer 17 to achieve electrical connection with the pixel driving circuit 2. The pixel driving circuit 2 is used to provide driving signals to the corresponding first electrodes 31.

[0051] Furthermore, the display panel 100 also includes a pixel definition layer 40, which is disposed on the side of the first electrode 31 away from the substrate 10 and covers the first electrode 31 and the first planarization layer 17. The pixel definition layer 40 includes black pigment to enable it to block light. The pixel definition layer 40 includes a plurality of first openings 41 corresponding to the first electrode 31 and second openings 42 corresponding to the photosensor 3. The first openings 41 expose a portion of the first electrode 31. The second openings 42 allow light to pass through the pixel definition layer 40 to reach the photosensor 3, solving the problem that existing under-display optical fingerprint sensors are difficult to directly apply in OLED products.

[0052] The light-emitting layer 33 is disposed on the side of the pixel definition layer 40 away from the substrate 10, and covers the pixel definition layer 40 and the first electrode 31 located within the first opening 41. A second electrode layer 32 is disposed on the side of the light-emitting layer 33 away from the substrate 10. The light-emitting layer 33 emits light under the action of the second electrode layer 32. The first electrode 31 is the anode, and the second electrode layer 32 is the cathode. Of course, the light-emitting layer 33 may also include auxiliary functional layers, such as hole transport layers, electron transport layers, or other organic functional layers.

[0053] The second electrode layer 32 includes a third opening 321 corresponding to the second opening 42. The aperture of the third opening 321 is greater than or equal to the aperture of the second opening 42, such that the orthographic projection of the third opening 321 on the substrate 10 covers the orthographic projection of the second opening 42 on the substrate 10, and the orthographic projection area of ​​the third opening 321 on the substrate 10 is greater than the orthographic projection area of ​​the second opening 42 on the substrate 10, so as to avoid the second electrode layer 32 from blocking the second opening 42.

[0054] Furthermore, the display panel 100 also includes a metal suppression layer 50 disposed corresponding to the third opening 321. The metal suppression layer 50 is deposited within the second opening 42. Optionally, the material of the metal suppression layer 50 includes an organic material with oleophilic groups, and the material of the second electrode layer 32 includes a metallic material with hydrophilic groups.

[0055] Before preparing the second electrode layer 32, the metal suppression layer 50 is first deposited at the position corresponding to the photosensitive sensor 3 using processes such as vapor deposition. Then, the second electrode layer 32 is deposited on the entire surface of the light-emitting layer 33. Patterning is achieved by utilizing the mutual repulsion between the groups between the second electrode layer 32 and the metal suppression layer 50, so that the second electrode layer 32 naturally breaks at the position of the metal suppression layer 50 to form the third opening 321.

[0056] Furthermore, the display panel 100 also includes an encapsulation layer 60 disposed on the side of the light-emitting functional layer 30 away from the driving circuit layer 20. The encapsulation layer 60 is used to protect the light-emitting functional layer 30 to prevent water and oxygen from entering the light-emitting layer 33 and causing it to fail. Specifically, the encapsulation layer 60 is disposed on the side of the second electrode layer 32 away from the substrate 10. The encapsulation layer 60 also covers the second electrode layer 32 and the metal suppression layer 50, and the metal suppression layer 50 also fills the second opening 42 and the third opening 321. The refractive index of the encapsulation layer 60 is greater than the refractive index of the metal suppression layer 50.

[0057] Optionally, the encapsulation layer 60 includes a first inorganic encapsulation sublayer 61, an organic encapsulation sublayer 62, and a second inorganic encapsulation sublayer 63, which are stacked sequentially. The first inorganic encapsulation sublayer 61 is in contact with the surface of the metal suppression layer 50 away from the substrate 10. The first inorganic encapsulation sublayer 61 fills the second opening 42 and the third opening 321, and the refractive index of the first inorganic encapsulation sublayer 61 is greater than the refractive index of the metal suppression layer 50, so that light passing through the second opening 42 is converged. Optionally, the refractive index of the first inorganic encapsulation sublayer 61 is 1.7, and the refractive index of the metal suppression layer 50 is 1.4.

[0058] Specifically, refer to Figure 3 The slope angle of the second opening 42 is less than 90 degrees, so that the pixel definition layer 40 forming the second opening 42 is sloped, thereby making the angle between the sidewall of the second opening 42 and the bottom surface of the second opening 42 near the substrate 10 greater than 90 degrees. The metal suppression layer 50 at least covers the sidewall of the second opening 42 and the sidewall of the third opening 321, such that the portion of the metal suppression layer 50 covering the sidewall of the second opening 42 also has a slope angle of less than 90 degrees.

[0059] It should be noted that the slope angle α of the second opening 42 refers to the angle between the sidewall of the second opening 42 and the flat layer covered by the pixel definition layer 40, and the sidewall of the second opening 42 refers to the surface of the pixel definition layer 40 exposed by the second opening 42 after the second opening 42 is formed. The slope angle of the metal suppression layer 50 refers to the angle between the portion of the metal suppression layer 50 covering the sidewall of the second opening 42 and the flat layer covered by the pixel definition layer 40.

[0060] Furthermore, when the light reflected by the fingerprint F passes through the first inorganic encapsulation sublayer 61 and reaches the interface between the first inorganic encapsulation sublayer 61 and the metal suppression layer 50, light that is substantially perpendicular to the receiving surface of the photosensor 3 can reach the photosensor 3, such as... Figure 3 Light rays at angles X are refracted by the metal suppression layer 50, while light rays at other angles are refracted, such as... Figure 3 The light rays Y and Y' in the light are reflected in the optical fingerprint. Moreover, since the refractive index of the first inorganic encapsulation sublayer 61 is greater than that of the metal suppression layer 50, the light rays refracted by the metal suppression layer 50 will converge towards the receiving surface of the photosensitive sensor 3, thereby increasing the amount of light reaching the receiving surface of the photosensitive sensor 3, thus improving the clarity of the formed optical fingerprint pattern and improving the accuracy of fingerprint recognition.

[0061] In one embodiment, please refer to the reference. Figures 1 to 5 , Figure 4 This is a schematic diagram of another cross-sectional structure of the display panel provided in an embodiment of this application. Figure 5 for Figure 4 A detailed structural diagram of the second opening is shown. Unlike the previous embodiment, the display panel 101 further includes a color filter layer 70 disposed on the side of the encapsulation layer 60 away from the substrate 10. The color filter layer 70 includes a light-shielding portion 71 and a light-filtering portion 72. The light-shielding portion 71 includes a fourth opening 711 corresponding to the first opening 41 and a fifth opening 712 corresponding to the second opening 42. The light-filtering portion 72 is disposed corresponding to the fourth opening 711. The material of the light-shielding portion 71 includes an opaque material such as a black matrix.

[0062] Optionally, the filter unit 72 includes a red color film, a green color film, and a blue color film, wherein the red color film is configured corresponding to the red sub-pixel R, the green filter unit 72 is configured corresponding to the green sub-pixel G, and the blue filter unit 72 is configured corresponding to the blue sub-pixel B.

[0063] Optionally, the orthographic projection of the second opening 42 on the substrate 10 and the orthographic projection of the fifth opening 712 on the substrate 10 overlap in an area, and the orthographic projection of the photosensor 3 on the substrate 10 coincides with the overlapping area. This ensures that only light passing through the overlapping area can reach the photosensor 3, while other large-angle light is absorbed by the pixel definition layer 40 near the second opening 42 and the light-shielding portion 71 near the fifth opening 712.

[0064] Thus, the pixel definition layer 40, the second opening 42 of the pixel definition layer 40, the light-shielding part 71, and the fifth opening 712 of the light-shielding part 71 constitute a collimator. The collimator can collimate the light passing through it and filter out some large-angle light, so that only collimated light within a small range hits the light sensor 3, thereby achieving a high signal-to-noise ratio and improving the recognition accuracy of the light sensor 3.

[0065] Optionally, the second opening 42 has the same shape as the fifth opening 712, and the size of the second opening 42 is the same as the size of the fifth opening 712. Further, the shape of the second opening 42 near the bottom surface of the substrate 10 is the same as the shape of the fifth opening 712 near the bottom surface of the substrate 10, and the size of the second opening 42 near the bottom surface of the substrate 10 is the same as the size of the fifth opening 712 near the bottom surface of the substrate 10. That is, the orthographic projection of the bottom surface of the second opening 42 near the substrate 10 onto the substrate 10 coincides with the orthographic projection of the bottom surface of the fifth opening 712 near the substrate 10 onto the substrate 10, thereby improving the collimation effect of the collimator on light efficiency.

[0066] In one embodiment, an adjustment layer 80 is further provided between the color filter layer 70 and the encapsulation layer 60. The adjustment layer 80 is used to adjust the distance between the color filter layer 70 and the encapsulation layer 60, thereby adjusting the distance between the color filter layer 70 and the pixel definition layer 40, so as to form a collimator of a preset height, thereby improving the collimator's collimation effect on light. The material of the adjustment layer 80 includes transparent adhesives such as OC adhesive.

[0067] Specifically, refer to Figure 5 To improve the collimation effect of the collimator, the parameters of the collimator need to satisfy the following relationship:

[0068] In the above formula, "L" represents the height of the collimator, "D" represents the aperture of the collimator, "Z" represents one fingerprint cycle of the fingerprint F, and one fingerprint cycle includes the sum of the distances between an adjacent ridge and a valley in the fingerprint; "H" represents the distance from the fingerprint F to the photosensitive sensor 3.

[0069] By ensuring that the parameters of the collimator satisfy the above-mentioned relationship, when light is reflected by the fingerprint F and passes through the collimator, light that is substantially perpendicular to the receiving surface of the photosensor 3 can reach the photosensor 3, such as... Figure 3 The light rays at large angles are filtered out by the light-shielding part 71 and the pixel definition layer 40, while other large-angle light rays are blocked by the light-shielding part 71 and the pixel definition layer 40. This filters out large-angle light rays, so that more large-angle light rays are not received by the light sensor 3, thereby enabling each light sensor 3 to identify light in a smaller area, achieving a higher signal-to-noise ratio and further improving the recognition accuracy of the light sensor 3.

[0070] It should be noted that the height of the collimator includes the sum of the thickness of the light-shielding part 71, the thickness of the adjustment layer 80, the thickness of the encapsulation layer 60, and the thickness of the pixel definition layer 40, which is the distance between the upper surface of the light-shielding part 71 and the lower surface of the pixel definition layer 40. The upper surface of the light-shielding part 71 refers to the surface of the light-shielding part 71 away from the encapsulation layer 60, and the lower surface of the pixel definition layer 40 refers to the surface of the pixel definition layer 40 away from the encapsulation layer 60. Furthermore, the aperture of the collimator refers to the size of the overlapping area of ​​the second opening 42 and the fifth opening 712, that is, the size of the second opening 42 near the bottom surface of the substrate 10. For example, when the overlapping area of ​​the second opening 42 and the fifth opening 712 is circular, the aperture of the collimator is the diameter of the circle. The aperture of the collimator is less than half a fingerprint cycle, for example, less than 200 micrometers. This allows each of the three light sensors to receive only a very small range of light, resulting in a more detailed fingerprint image and further improving the accuracy of fingerprint recognition.

[0071] Furthermore, when the light filtered by the collimator passes through the first inorganic encapsulation sub-layer 61 and reaches the interface between the first inorganic encapsulation sub-layer 61 and the metal suppression layer 50, light that is substantially perpendicular to the receiving surface of the photosensor 3 can reach the photosensor 3, such as... Figure 5 Light rays at angles X are refracted by the metal suppression layer 50, while light rays at other angles are refracted, such as... Figure 5The light rays Y and Y' in the light are refracted by the first inorganic encapsulation sublayer 61. Moreover, since the refractive index of the first inorganic encapsulation sublayer 61 is greater than that of the metal suppression layer 50, the light rays refracted by the metal suppression layer 50 will converge towards the receiving surface of the photosensitive sensor 3, thereby increasing the amount of light reaching the receiving surface of the photosensitive sensor 3, thus improving the clarity of the formed optical fingerprint pattern, and further improving the accuracy of fingerprint recognition.

[0072] In this embodiment, the collimator is formed by designing the film structure on the display panel 101 so that the light reflected by the fingerprint F can pass through the collimator and reach the photosensitive sensor 3, thereby realizing the fingerprint recognition function of the display panel 101. Simultaneously, the collimator also has a light collimation function to filter out some large-angle light, improving the signal-to-noise ratio of the photosensitive sensor 3 and thus improving its recognition accuracy. Furthermore, a low-refractive-index metal suppression layer 50 is disposed within the second opening 42 and cooperates with a high-refractive-index encapsulation layer 60 to converge the light filtered by the collimator toward the receiving surface of the photosensitive sensor 3, increasing the amount of light reaching the receiving surface of the photosensitive sensor 3, thereby improving the clarity of the formed optical fingerprint pattern and further improving the fingerprint recognition accuracy.

[0073] In addition, the display panel 101 of this embodiment differs from the display panel 100 of the above embodiment in the following ways: (Continuing to refer to...) Figure 4 The driving circuit layer 20 further includes a second drain 26, which is disposed on the first planarization layer 17 and electrically connected to the first drain 25 through a via in the first planarization layer 17. A second planarization layer 18 covers the second drain 26 and the first planarization layer 17. The first electrode 31 is disposed on the second planarization layer 18 and electrically connected to the second drain 26 through a via in the second planarization layer 18. The pixel definition layer 40 covers the first electrode 31 and the second planarization layer 18.

[0074] By providing the second drain 26, the display panel 101 can meet the richer wiring requirements. Simultaneously, the second drain 26 and the first drain 25 are electrically connected, which reduces the contact resistance of the first electrode 31. Furthermore, by providing the stacked first planarization layer 17 and second planarization layer 18, the undulating terrain of the driving circuit layer 20 can be better flattened, forming a flatter surface, which facilitates the formation of a flat first electrode 31. Other descriptions are provided in the above embodiments and will not be repeated here.

[0075] In one embodiment, please refer to the reference. Figures 1 to 6 , Figure 6This is another cross-sectional structural diagram of the display panel provided in this application embodiment. Unlike the above embodiment, the display panel 102 further includes a touch layer located between the encapsulation layer 60 and the color filter layer 70. The touch layer includes a touch electrode sub-layer 91, which has a sixth opening 911 at a position corresponding to the photosensor 3, and the sixth opening 911 corresponds to the second opening 42. The collimator also includes the touch electrode sub-layer 91 and its sixth opening 911.

[0076] Specifically, a DOT (Direct on-cell touch, where the touch layer is directly fabricated on the encapsulation layer 60) touch solution can be used to directly fabricate the touch layer on the encapsulation layer 60, thereby achieving better transmittance and bending resistance, while effectively reducing the thickness of the display panel 102 and lowering product costs. Optionally, a protective layer can be formed on the encapsulation layer 60 before fabricating the touch layer thereon to protect the encapsulation layer 60.

[0077] Optionally, the touch electrode sublayer 91 may include a driving electrode and a sensing electrode to realize touch functionality. To reduce the resistance of the touch electrode sublayer 91, the material of the touch electrode sublayer 91 may be an opaque metal, such as copper. However, the opaque nature of the touch electrode sublayer 91 will block light, affecting the light recognition of the photosensitive sensor 3. Therefore, the touch electrode sublayer 91 has a sixth opening 911 at the position corresponding to the photosensitive sensor 3 to allow light to pass through. The orthographic projection of the sixth opening 911 onto the substrate 10 at least covers the overlapping area of ​​the second opening 42 and the fifth opening 712, so that the touch electrode sublayer 91 and the corresponding sixth opening 911 also constitute part of the collimator, further improving the light collimation effect of the collimator.

[0078] In one embodiment, the second opening 42 has the same shape as the sixth opening 911, and the size of the second opening 42 is less than or equal to the size of the sixth opening 911. Further, the bottom surface of the second opening 42 near the substrate 10 has the same shape as the bottom surface of the sixth opening 911 near the substrate 10, and the size of the bottom surface of the second opening 42 near the substrate 10 is less than or equal to the size of the bottom surface of the sixth opening 911 near the substrate 10. That is, the orthographic projection of the bottom surface of the sixth opening 911 near the substrate 10 onto the substrate 10 overlaps with the orthographic projection of the bottom surface of the second opening 42 near the substrate 10 onto the substrate 10, thereby preventing the touch electrode sublayer 91 from obstructing the second opening 42.

[0079] Optionally, the second opening 42, the fifth opening 712, and the sixth opening 911 are projected onto the substrate 10 in a way that minimizes the size of each opening constituting the collimator, thereby reducing the risk of light leakage from the collimator.

[0080] Furthermore, the display panel 102 of this embodiment differs from the display panel 101 of the above embodiment in the following ways: (Continuing to refer to...) Figure 6 The display panel 102 further includes a first power line 36, which is disposed on the same layer as the second drain 26. The first power line 36 is electrically connected to the upper electrode plate through a via in the first planarization layer 17, and is used to provide a constant bias voltage to the photosensor 3. Other descriptions are as described in the above embodiments and will not be repeated here.

[0081] In one embodiment, please refer to the reference. Figures 1 to 7 , Figure 7 This is a schematic diagram illustrating the principle of total internal reflection at the interface between the metal suppression layer and the encapsulation layer, as provided in this embodiment. Unlike the previous embodiment, when the light filtered by the collimator passes through the first inorganic encapsulation sub-layer 61 and reaches the first interface between the first inorganic encapsulation sub-layer 61 and the metal suppression layer 50, the light undergoes total internal reflection at the first interface between the encapsulation layer 60 and the metal suppression layer 50. This causes the light emitted through the metal suppression layer 50 to deviate from the photosensor 3, further filtering large-angle light passing through the collimator, thereby further improving the signal-to-noise ratio of the photosensor 3 and increasing recognition accuracy.

[0082] Specifically, refer to Figure 7 When the light reflected by the fingerprint F passes through the collimator, due to the collimating effect of the collimator, the light rays passing through the collimator are basically perpendicular to the receiving surface of the photosensor 3. However, among these light rays that are basically perpendicular to the receiving surface of the photosensor 3, there will inevitably be some light rays with large angles, such as... Figure 7 The large-angle rays Y and Y' shown schematically also affect the signal-to-noise ratio of the light sensor 3.

[0083] To this end, a high-refractive-index encapsulation layer 60 and a low-refractive-index metal suppression layer 50 are provided at a position on the collimator near the photosensor 3 to filter out these large-angle rays Y and Y'. Optionally, to filter out these large-angle rays Y and Y', the metal suppression layer 50 can be provided with a preset slope so that these large-angle rays Y and Y' emit total internal reflection when they hit the first interface between the encapsulation layer 60 and the metal suppression layer 50.

[0084] Specifically, by adjusting the shape of the second opening 42 of the pixel definition layer 40, the portion of the pixel definition layer 40 forming the second opening 42 is made to have a slope, thereby causing the metal suppression layer 50, after covering the sidewall of the second opening 42, to also form a certain slope. Optionally, the longitudinal cross-sectional shape of the second opening 42 includes an inverted trapezoid, such that the second opening 42 has a slope angle α, which is greater than or equal to 55 degrees. Thus, the portion of the metal suppression layer 50 covering the sidewall of the second opening 42 also has a slope angle greater than or equal to 55 degrees, to achieve total internal reflection of large-angle rays Y and Y' at the interface between the encapsulation layer 60 and the metal suppression layer 50.

[0085] It should be noted that the slope angle α of the second opening 42 refers to the angle between the sidewall of the second opening 42 and the flat layer covered by the pixel definition layer 40, and the sidewall of the second opening 42 refers to the surface of the pixel definition layer 40 exposed by the second opening 42 after the second opening 42 is formed. The slope angle of the metal suppression layer 50 refers to the angle between the portion of the metal suppression layer 50 covering the sidewall of the second opening 42 and the flat layer covered by the pixel definition layer 40.

[0086] Furthermore, continue to refer to Figure 7 When large-angle rays Y and Y' are totally internally reflected at the first interface between the encapsulation layer 60 and the metal suppression layer 50, the totally internalized rays will again strike the second interface between the encapsulation layer 60 and the metal suppression layer 50, and be refracted at the second interface. The refracted rays deviate from the photosensor 3, thereby filtering out the large-angle rays Y and Y', further filtering the light passing through the collimator, and further improving the signal-to-noise ratio and recognition accuracy of the photosensor 3. The first interface and the second interface are two different surfaces of the metal suppression layer 50. The first interface is formed by the metal suppression layer 50 covering the sidewall of the second opening 42, and the second interface is formed by the metal suppression layer 50 covering the planarization layer below the pixel definition layer 40.

[0087] In this embodiment, the light reflected by the fingerprint F can pass through the collimator to reach the photosensitive sensor 3. The collimator also has a light collimation function to filter out some large-angle light, thereby improving the signal-to-noise ratio of the photosensitive sensor 3 and thus improving the recognition accuracy of the photosensitive sensor 3. Moreover, the low-refractive-index metal suppression layer 50 is disposed in the second opening 42 and cooperates with the high-refractive-index encapsulation layer 60, so that the light filtered by the collimator passes through the first inorganic encapsulation sub-layer 61 and reaches the first interface between the first inorganic encapsulation sub-layer 61 and the metal suppression layer 50 and undergoes total internal reflection. This causes the light emitted from the metal suppression layer 50 to deviate from the photosensitive sensor 3, further filtering the large-angle light passing through the collimator, thereby further improving the signal-to-noise ratio of the photosensitive sensor 3 and further improving the recognition accuracy.

[0088] Based on the same inventive concept, this application also provides an electronic device, which includes a display panel from one of the foregoing embodiments. The electronic device includes electronic display products such as mobile phones, tablets, televisions, and wearable devices.

[0089] As can be seen from the above embodiments:

[0090] This application provides a display panel and an electronic device in which the driving circuit layer of the display panel includes multiple pixel driving circuits and a photosensitive sensor disposed between adjacent pixel driving circuits. A first electrode is electrically connected to the pixel driving circuit. A pixel definition layer has a first opening at a position corresponding to the first electrode and a second opening at a position corresponding to the photosensitive sensor. A second electrode layer has a third opening at a position corresponding to the second opening. A metal suppression layer is disposed corresponding to the third opening and is laid within the second opening. An encapsulation layer covers the metal suppression layer and fills the second opening. The refractive index of the encapsulation layer is greater than that of the metal suppression layer. This application solves the problem that existing under-display optical fingerprints are difficult to directly apply to OLED products by providing a second opening on the pixel definition layer, allowing light to pass through the pixel definition layer and reach the photosensitive sensor. At the same time, the low-refractive-index metal suppression layer is disposed within the second opening and cooperates with the high-refractive-index encapsulation layer to converge the fingerprint reflected light toward the receiving surface of the photosensitive sensor, thereby increasing the amount of light reaching the receiving surface of the photosensitive sensor, thereby improving the clarity of the formed optical fingerprint pattern and thus improving the accuracy of fingerprint recognition.

[0091] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0092] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A display panel, characterized in that, include: Substrate; A driving circuit layer is disposed on one side of the substrate, and the driving circuit layer includes: a plurality of pixel driving circuits and a light sensor disposed between adjacent pixel driving circuits; A first electrode layer is disposed on the side of the driving circuit layer away from the substrate. The first electrode layer includes a plurality of first electrodes, and the first electrodes are electrically connected to the corresponding pixel driving circuit. A pixel definition layer is disposed on the side of the first electrode layer away from the substrate. The pixel definition layer includes: a plurality of first openings corresponding to the first electrode and a second opening corresponding to the photosensor. A light-emitting layer is disposed on the side of the pixel definition layer away from the substrate; A second electrode layer is disposed on the side of the light-emitting layer away from the substrate, and the second electrode layer includes a third opening corresponding to the second opening; A metal suppression layer is provided corresponding to the third opening and is laid inside the second opening; An encapsulation layer is disposed on the side of the second electrode layer away from the substrate, and the encapsulation layer also covers the metal suppression layer and fills the second opening; Wherein, the refractive index of the encapsulation layer is greater than the refractive index of the metal suppression layer; Wherein, the aperture of the third opening is larger than the aperture of the second opening, such that the orthographic projection of the third opening on the substrate covers the orthographic projection of the second opening on the substrate, and the orthographic projection area of ​​the third opening on the substrate is larger than the orthographic projection area of ​​the second opening on the substrate. The display panel further includes a color filter layer disposed on the side of the encapsulation layer away from the substrate; the color filter layer includes a light-shielding portion and a light-filtering portion; the light-shielding portion includes a fourth opening corresponding to the first opening and a fifth opening corresponding to the second opening; the light-filtering portion is disposed corresponding to the fourth opening; Wherein, the orthographic projection of the second opening on the substrate and the orthographic projection of the fifth opening on the substrate have an overlapping area, and the orthographic projection of the photosensor on the substrate coincides with the overlapping area.

2. The display panel according to claim 1, characterized in that, The angle between the sidewall of the second opening and the bottom surface of the second opening near the substrate is greater than 90 degrees; The metal suppression layer at least covers the sidewall of the second opening.

3. The display panel according to claim 2, characterized in that, The encapsulation layer includes a first inorganic encapsulation sublayer, an organic encapsulation sublayer, and a second inorganic encapsulation sublayer stacked sequentially. The first inorganic encapsulation sublayer is in contact with the surface of the metal suppression layer away from the substrate, and the refractive index of the first inorganic encapsulation sublayer is greater than the refractive index of the metal suppression layer.

4. The display panel according to claim 1, characterized in that, The pixel definition layer includes black pigment, and the second opening has the same shape as the fifth opening, and the size of the second opening is the same as the size of the fifth opening.

5. The display panel according to claim 4, characterized in that, The second opening near the bottom surface of the substrate has the same shape as the fifth opening near the bottom surface of the substrate, and the size of the second opening near the bottom surface of the substrate is the same as the size of the fifth opening near the bottom surface of the substrate.

6. The display panel according to any one of claims 1 to 5, characterized in that, Also includes: A touch layer is disposed on the side of the encapsulation layer away from the substrate. The touch layer includes a touch electrode sublayer, and the touch electrode sublayer includes a sixth opening corresponding to the second opening.

7. The display panel according to claim 6, characterized in that, The second opening has the same shape as the sixth opening, and the size of the second opening is less than or equal to the size of the sixth opening.

8. The display panel according to claim 1, characterized in that, A portion of the film layer of the light sensor is disposed on the same layer as a portion of the film layer of the pixel driving circuit.

9. An electronic device, characterized in that, Includes the display panel as described in any one of claims 1 to 8.

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