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

Abstract

The present invention discloses a display panel, a manufacturing method thereof, and a display device. The display panel includes: a substrate, a plurality of first electrodes, a pixel definition layer, a second electrode, a light-emitting layer, and a plurality of photosensitive detection units; the pixel definition layer includes: a plurality of first openings respectively exposing the first electrodes, and a plurality of second openings respectively corresponding to the photosensitive detection units; the second electrode includes: a plurality of third openings respectively corresponding to the second openings; a positive projection of the third opening on the substrate and a positive projection of the corresponding photosensitive detection unit on the substrate have an overlapping area. By providing a plurality of second openings in the pixel definition layer and a plurality of third openings in the second electrode, the reflected light of the finger directly passes through the third opening and the second opening and is directed to the photosensitive detection unit, reducing the loss of reflected light, increasing the intensity of the light directed to the photosensitive detection unit, and improving the fingerprint recognition accuracy.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and particularly to a display panel, a manufacturing method thereof, and a display device. Background Art

[0002] With the rapid development of display technologies, in addition to the traditional function of information display, the fingerprint recognition function has gradually become a standard configuration of displays for Organic Light-Emitting Diode (OLED) displays. Moreover, the requirements for the appearance are also gradually increasing. A larger screen-to-body ratio is the trend in the future market. Therefore, the in-screen fingerprint recognition technology is highly favored by consumers.

[0003] However, for a display with in-screen fingerprint recognition, the reflected light of the finger needs to pass through film layers such as the cathode before reaching the photosensitive sensor. At least half of the light is lost when the reflected light passes through the film layers such as the cathode, resulting in less light reaching the photosensitive sensor and poor fingerprint recognition effect. Summary of the Invention

[0004] Embodiments of the present invention provide a display panel, a manufacturing method thereof, and a display device, which are used to solve the problem of poor fingerprint recognition effect in related technologies.

[0005] In a first aspect, embodiments of the present invention provide a display panel, including: a substrate, a plurality of first electrodes located on the substrate, a pixel definition layer located on a side of the first electrodes facing away from the substrate, a second electrode located on a side of the pixel definition layer facing away from the substrate, a light-emitting layer located between the first electrode and the second electrode, and a plurality of photosensitive detection units located on a side of the light-emitting layer facing away from the second electrode;

[0006] The pixel definition layer includes: a plurality of first openings respectively exposing the first electrodes, and a plurality of second openings respectively corresponding to the photosensitive detection units;

[0007] The second electrode includes: a plurality of third openings respectively corresponding to the second openings;

[0008] A positive projection of the third opening on the substrate and a positive projection of the corresponding photosensitive detection unit on the substrate have an overlapping area.

[0009] In a possible implementation manner, in the display panel provided by embodiments of the present invention, the second electrode covers a sidewall of the second opening;

[0010] In a direction from the substrate to the light-emitting layer, a cross-sectional area of the second opening gradually increases in a direction parallel to the substrate.

[0011] In a possible implementation, in the display panel provided by the embodiments of the present invention, it further includes: a plurality of support structures located between the pixel definition layer and the second electrode;

[0012] The support structure includes a fourth opening corresponding to the second opening;

[0013] The second electrode covers the sidewall of the fourth opening;

[0014] In the direction from the substrate to the light-emitting layer, the cross-sectional area of the fourth opening gradually increases in a direction parallel to the substrate.

[0015] In a possible implementation, in the display panel provided by the embodiments of the present invention, the first inclination angle is greater than or equal to the second inclination angle;

[0016] The first inclination angle is the angle between the sidewall of the second opening and the bottom surface of the pixel definition layer; the bottom surface of the pixel definition layer is the surface of the pixel definition layer close to the substrate side;

[0017] The second inclination angle is the angle between the sidewall of the fourth opening and the top surface of the pixel definition layer; the top surface of the pixel definition layer is the surface of the pixel definition layer away from the substrate side.

[0018] In a possible implementation, in the display panel provided by the embodiments of the present invention, the first inclination angle is greater than or equal to 45° and less than 90°;

[0019] The second inclination angle is greater than or equal to 15° and less than or equal to 45°.

[0020] In a possible implementation, in the display panel provided by the embodiments of the present invention, the sidewall of the second opening is a plane or a curved surface;

[0021] The sidewall of the fourth opening is a plane or a curved surface.

[0022] In a possible implementation, in the display panel provided by the embodiments of the present invention, the pixel definition layer includes an opaque material.

[0023] In a possible implementation, in the display panel provided by the embodiments of the present invention, it further includes: a planar layer located on the side of the first electrode close to the substrate;

[0024] The photosensitive detection unit is located between the substrate and the planar layer.

[0025] In a possible implementation, in the display panel provided by the embodiments of the present invention, it further includes: an organic inhibition layer located between the light-emitting layer and the second electrode;

[0026] The organic inhibition layer includes: a plurality of organic inhibition units corresponding to the respective photosensitive detection units.

[0027] In a second aspect, an embodiment of the present invention further provides a display device, including: the above-mentioned display panel.

[0028] In a third aspect, an embodiment of the present invention further provides a manufacturing method of the above-mentioned display panel, including:

[0029] Forming a plurality of photosensitive detection units and a plurality of first electrodes on a substrate;

[0030] Forming a pixel definition layer on the film layer where the first electrode is located, and patterning the pixel definition layer to obtain a plurality of first openings and a plurality of second openings;

[0031] Forming a light-emitting layer on the pixel definition layer;

[0032] Forming a patterned second electrode on the light-emitting layer to obtain a plurality of third openings.

[0033] In a possible implementation, in the manufacturing method provided by the embodiments of the present invention, the step of forming a patterned second electrode on the light-emitting layer to obtain a plurality of third openings includes:

[0034] Using a mask to block the positions except the respective photosensitive detection units, and evaporating an organic inhibition layer on the light-emitting layer; the organic inhibition layer is used to inhibit the film formation of the second electrode;

[0035] Evaporating the second electrode on the organic inhibition layer to form the patterned second electrode.

[0036] The beneficial effects of the present invention are as follows:

[0037] The display panel, manufacturing method thereof, and display device provided by the embodiments of the present invention. The display panel includes: a substrate, a plurality of first electrodes located on the substrate, a pixel definition layer located on the side of the first electrodes facing away from the substrate, a second electrode located on the side of the pixel definition layer facing away from the substrate, a light-emitting layer located between the first electrode and the second electrode, and a plurality of photosensitive detection units located on the side of the light-emitting layer facing away from the second electrode; the pixel definition layer includes: a plurality of first openings respectively exposing the first electrodes, and a plurality of second openings respectively corresponding to the photosensitive detection units; the second electrode includes: a plurality of third openings respectively corresponding to the second openings; the orthographic projection of the third opening on the substrate and the orthographic projection of the corresponding photosensitive detection unit on the substrate have an overlapping area. By providing a plurality of second openings in the pixel definition layer and a plurality of third openings in the second electrode, the reflected light of the finger directly passes through the third opening and the second opening and irradiates onto the photosensitive detection unit, reducing the loss of reflected light, increasing the intensity of the light irradiating onto the photosensitive detection unit, and improving the fingerprint recognition accuracy. Description of the Drawings

[0038] Figure 1 It is a top view structural schematic diagram of the display panel provided by the embodiments of the present invention;

[0039] Figure 2 is Figure 1 One of the cross-sectional schematics at line AA' in

[0040] Figure 3 It is a partial schematic diagram of the condenser formed by the second electrode at the second opening;

[0041] Figures 4 to 6 It is a simplified schematic diagram of the condenser formed by the second electrode at the second opening and the fourth opening in the embodiments of the present invention;

[0042] Figure 7 is Figure 1 Another cross-sectional schematic at line AA' in

[0043] Figure 8 is Figure 1 Another cross-sectional schematic at line AA' in

[0044] Figure 9 It is a flowchart of the manufacturing method of the above display panel provided by the embodiments of the present invention;

[0045] Figures 10 to 14 It is a schematic diagram of the structure corresponding to each step in the manufacturing method provided by the embodiments of the present invention. Detailed Embodiments

[0046] Aiming at the problem of poor fingerprint recognition effect in the related art, the embodiments of the present invention provide a display panel, a manufacturing method thereof, and a display device.

[0047] The following will combine with the accompanying drawings to provide a detailed description of the specific embodiments of the display panel, its manufacturing method, and the display device provided by the embodiments of the present invention. The thickness and shape of each film layer in the drawings do not reflect the true proportion, and the purpose is only to schematically illustrate the content of the present invention.

[0048] In a first aspect, an embodiment of the present invention provides a display panel. Figure 1 It is a top view structural schematic diagram of the display panel provided by the embodiment of the present invention. Figure 2 is Figure 1 a cross-sectional schematic diagram at the line AA' in Figure 1 and Figure 2 As shown, it includes: a substrate 10, a plurality of first electrodes 11 located on the substrate 10, a pixel definition layer 12 located on the side of the first electrode 11 facing away from the substrate 10, a second electrode 13 located on the side of the pixel definition layer 12 facing away from the substrate 10, a light-emitting layer 14 located between the first electrode 11 and the second electrode 13, and a plurality of photosensitive detection units 15 located on the side of the light-emitting layer 14 facing away from the second electrode 13.

[0049] The pixel definition layer 12 includes: a plurality of first openings U1 respectively exposing each first electrode 11, and a plurality of second openings U2 respectively corresponding to each photosensitive detection unit 15.

[0050] The second electrode 13 includes: a plurality of third openings U3 respectively corresponding to each second opening U2.

[0051] The orthographic projection of the third opening U3 on the substrate 10 and the orthographic projection of the corresponding photosensitive detection unit 15 on the substrate 10 have an overlapping area.

[0052] In the display panel provided by the embodiment of the present invention, by providing a plurality of second openings respectively corresponding to each photosensitive detection unit in the pixel definition layer, providing a plurality of third openings respectively corresponding to each second opening in the second electrode, and the orthographic projection of the third opening on the substrate and the orthographic projection of the corresponding photosensitive detection unit on the substrate have an overlapping area, so that the reflected light of the finger directly passes through the third opening and the second opening and shoots towards the photosensitive detection unit, reducing the loss of reflected light, increasing the intensity of the light shooting towards the photosensitive detection unit, and improving the fingerprint recognition accuracy.

[0053] Such as Figure 2As shown, the pixel definition layer 12 can define the regions of the sub-pixels. Specifically, the pixel definition layer 12 includes a plurality of first openings U1 that respectively expose the first electrodes 11, so that the light-emitting layer 14 can be in contact with the first electrodes 11, and carriers are provided to the light-emitting layer 14 through the first electrodes 11 and the second electrodes 13 respectively, so that the light-emitting layer 14 emits light. In practical applications, the light-emitting layer 14 can include a plurality of light-emitting units corresponding to the first openings U1 respectively, or the light-emitting layer 14 can also be provided as a whole layer, which is not limited herein. In addition, functional layers such as a hole injection layer, a hole transport layer, an electron injection layer, and an electron transport layer can also be provided between the first electrode 11 and the second electrode 13. The functional layers can be provided as functional units corresponding to the first openings U1 respectively, or the functional layers can also be provided as a whole layer, which is not limited herein.

[0054] In the embodiments of the present invention, the first electrode 11 is an anode and the second electrode 13 is a cathode, or the first electrode 11 is a cathode and the second electrode 13 is an anode. In the embodiments of the present invention, the case where the first electrode 11 is an anode and the second electrode 13 is a cathode is taken as an example for description. In specific implementation, the first electrode 11 can be made of a transparent conductive oxide such as indium tin oxide (ITO), and the second electrode 13 can be made of a metal material or alloy such as silver or magnesium. Combining Figure 1 , the region of the second electrode 13 except for the third openings U3 is provided as a whole surface.

[0055] As Figure 1 shown, each photosensitive detection unit 15 can be arranged in the fingerprint recognition area C, and the photosensitive detection unit 15 is located in the non-opening area between the sub-pixels. Combining Figure 2 , when a finger F touches the fingerprint recognition area C, the light emitted by the light-emitting layer 14 irradiates the finger F, and the reflected light of the finger F passes through the third openings U3 in the second electrode 13 and the second openings U2 in the pixel definition layer 12 and irradiates the photosensitive detection unit 15. Since the intensities of the reflected lights of the valleys and ridges in the finger F are different, the fingerprint pattern of the finger F can be obtained by detecting the intensities of the lights received by the photosensitive detection units 15. In the embodiments of the present invention, by providing a plurality of second openings U2 in the pixel definition layer 12 and a plurality of third openings U3 in the second electrode 13, and the positive projection of the third openings U3 on the substrate 10 overlaps with the positive projection of the corresponding photosensitive detection unit 15 on the substrate 10, the reflected light of the finger F can pass through the third openings U3 and the second openings U2 and irradiate the photosensitive detection unit 15 without passing through the second electrode 13 and the pixel definition layer 12, which can reduce the loss of the reflected light of the finger F and increase the intensity of the light irradiating the photosensitive detection unit 15, improving the fingerprint recognition effect.

[0056] As Figure 1As shown, the fingerprint recognition area C is set at a lower position in the display panel as an example for illustration. In specific implementation, the fingerprint recognition area C can also be set at other positions, which is not limited herein. For example, the fingerprint recognition area C can also be set at an upper position in the display panel, or the fingerprint recognition area C can also be set to be consistent with the display area of the display panel, so as to achieve full-screen fingerprint recognition.

[0057] As Figure 2 shown, the above-mentioned photosensitive detection unit 15 can be located inside the display panel, that is, the photosensitive detection unit 15 can be located between the light-emitting layer 14 and the substrate 10, or the photosensitive detection unit 15 can also be located on the side of the substrate 10 facing away from the light-emitting layer 14. In specific implementation, multiple photosensitive detection units 15 can be fabricated on a silicon-based substrate, and then the silicon-based substrate can be attached to the side of the substrate 10 facing away from the light-emitting layer 14 by using a transparent optical adhesive.

[0058] Furthermore, in the above-mentioned display panel provided by the embodiment of the present invention, as Figure 2 shown, the second electrode 13 covers the side wall of the second opening U2;

[0059] In the direction from the substrate 10 to the light-emitting layer 14 (such as the upward direction in the figure), the cross-sectional area of the second opening U2 gradually increases in the direction parallel to the substrate 10.

[0060] That is to say, the second opening U2 is funnel-shaped. For example, Figure 2 in the cross-sectional view shown, the second opening U2 is trapezoidal in reverse. Since the second electrode 13 is generally made of metal or alloy material, the second electrode 13 has a relatively high reflectivity. Covering the side wall of the second opening U2 with the second electrode 13 enables the second electrode 13 to form a funnel-shaped condenser at the second opening U2. Therefore, the reflected light of the finger F is reflected to the photosensitive detection unit 15 through the condenser, thereby expanding the light receiving range of the photosensitive detection unit 15, improving the utilization rate of light, further improving the fingerprint recognition accuracy, and enhancing the fingerprint recognition effect.

[0061] Figure 3 is a partial schematic diagram of the condenser formed by the second electrode 13 at the second opening U2. From Figure 3 it can be clearly seen that after the reflected light of the finger F is incident on the condenser, it is reflected back and forth in the condenser and finally incident on the photosensitive detection unit, significantly expanding the light receiving range of the photosensitive detection unit.

[0062] Even further, in the above-mentioned display panel provided by the embodiment of the present invention, as Figure 2 shown, it can further include: a plurality of support structures 16 located between the pixel definition layer 12 and the second electrode 13;

[0063] The support structure 16 includes a fourth opening U4 corresponding to the second opening U2;

[0064] The second electrode 13 covers the sidewall of the fourth opening U4;

[0065] In the direction from the substrate 10 towards the light-emitting layer 14 (the upward direction in the figure), the cross-sectional area of the fourth opening U4 in the direction parallel to the substrate 10 gradually increases.

[0066] By providing the support structure 16 between the pixel defining layer 12 and the second electrode 13, and the support structure 16 includes a fourth opening U4 corresponding to the second opening U2, referring to Figure 2 , it can be understood that the support structure 16 can be an annular structure. Since in the direction from the substrate 10 towards the light-emitting layer 14, the cross-sectional area of the fourth opening U4 in the direction parallel to the substrate 10 gradually increases, and the second electrode 13 is provided to cover the sidewall of the fourth opening U4, the volume of the condenser can be further increased. That is to say, the second electrode 13 covering the second opening U2 and the fourth opening U4 can form a larger funnel-shaped condenser. Therefore, the reflected light hitting the sidewalls of the fourth opening U4 and the second opening U2 can all be reflected and finally hit the photosensitive detection unit 15, thereby further increasing the light reception range of the photosensitive detection unit 15 and further enhancing the fingerprint recognition effect.

[0067] In a specific implementation, the minimum cross-sectional area of the fourth opening U4 in the direction parallel to the substrate 10 can be greater than or equal to the maximum cross-sectional area of the second opening U2 in the direction parallel to the substrate 10, and the bottom of the sidewall of the fourth opening U4 can be connected to the top of the sidewall of the second opening U2, so that the inner wall of the formed condenser is an inclined plane, and the light condensing effect is better.

[0068] In practical applications, in the above display panel provided by the embodiment of the present invention, it may further include: a spacer 18 located between the pixel defining layer 12 and the second electrode 13. In the actual process, the support structure 16 and the spacer 18 can be fabricated by the same patterning process, thereby saving one manufacturing process and reducing the manufacturing cost.

[0069] Specifically, in the above display panel provided by the embodiment of the present invention, referring to Figure 2 , the first inclination angle α is greater than or equal to the second inclination angle β;

[0070] The first inclination angle α is the angle between the sidewall of the second opening U2 and the bottom surface of the pixel defining layer 12; the bottom surface of the pixel defining layer 12 is the surface of the pixel defining layer 12 close to the substrate 10;

[0071] The second inclination angle β is the angle between the side wall of the fourth opening U4 and the top surface of the pixel defining layer 12; the top surface of the pixel defining layer 12 is the surface of the pixel defining layer 12 away from the substrate 10.

[0072] Therefore, in the direction from the substrate 10 to the light-emitting layer 14, the aperture diameters of the condensers formed by the second electrode 13 at the second opening U2 and the fourth opening U4 gradually increase, so that the light-condensing effect of the condenser is relatively high. When the process conditions permit, the larger the angle of the first inclination angle α, the better the light-condensing effect of the condenser, and the smaller the second inclination angle β is under the premise of ensuring the light-condensing effect, the better.

[0073] More specifically, in the above display panel provided by the embodiment of the present invention, as Figure 2 shown, the first inclination angle α is greater than or equal to 45° and less than 90°; the second inclination angle β is greater than or equal to 15° and less than or equal to 45°. In this way, it can be ensured that the first inclination angle α is greater than or equal to the second inclination angle β, so as to ensure a better light-condensing effect of the condenser, and it can be ensured that in the process of manufacturing, it is relatively easy to form the second opening U2 and the fourth opening U4. If the first inclination angle is small, it will cause the second inclination angle to be too small, and it is not easy to form in the process. In specific implementation, a photosensitive material can be used to make the pixel defining layer 12 and the support structure 16, and each first opening U1, each second opening U2 and each fourth opening U4 can be obtained through a photolithography process. The sizes of the first inclination angle α and the second inclination angle β can be adjusted by adjusting the parameters in the photolithography process. For example, parameters such as the light intensity or exposure time in the exposure process can be adjusted.

[0074] In specific implementation, in the above display panel provided by the embodiment of the present invention, referring to Figure 2 , the side wall of the second opening U2 is a plane or a curved surface;

[0075] The side wall of the fourth opening U4 is a plane or a curved surface.

[0076] Figures 4 to 6 is a simplified schematic diagram of the condenser formed by the second electrode at the second opening and the fourth opening in the embodiment of the present invention. In the figure, W1 represents the part corresponding to the second opening U2, and W2 represents the part corresponding to the fourth opening U4. As Figure 4 shown, the side walls of the second opening U2 and the fourth opening U4 corresponding to this condenser are both planes. As Figure 5 shown, the side walls of the second opening U2 and the fourth opening U4 corresponding to this condenser are both planes, and the first inclination angle is equal to the second inclination angle. As Figure 6 shown, the side wall of the second opening U2 corresponding to this condenser is a plane, and the side wall of the fourth opening U4 corresponding to this condenser is a concave surface. In the embodiment of the present invention, Figures 4 to 6Taking the shape of the concentrator shown as an example for illustration, in specific implementation, the side walls of the second opening U2 and the fourth opening U4 can also be of other shapes, which are not limited herein.

[0077] In specific implementation, with reference to Figure 2 , on the side of the second electrode 13 facing away from the substrate 10, film layers such as a packaging layer and a color film layer can also be provided. Among the light rays emitted by the light-emitting layer, a part can be emitted from the display surface of the display panel, and another part will return to the inside of the display panel after being reflected by the film layer, forming interfering light, which will ultimately be transmitted to the photosensitive detection unit 15 and affect the fingerprint recognition effect. In the above display panel provided by the embodiment of the present invention, the above pixel defining layer 12 can include light-blocking materials. For example, a black photosensitive polymer material can be used to make the pixel defining layer 12. Thus, the interfering light reflected back to the inside of the display panel can be filtered out, avoiding the influence of the interfering light on the fingerprint recognition effect, improving the signal-to-noise ratio of fingerprint detection, and, during the process of process manufacturing, only by changing the manufacturing material of the pixel defining layer 12, without adding process steps, thus not increasing the process cost.

[0078] In addition, a light-blocking layer can also be provided between the pixel defining layer 12 and the substrate 10, and openings corresponding to the respective second openings U2 are provided in the light-blocking layer. Thus, the reflected light of the finger F can be directed to the photosensitive detection unit 15, while the interfering light reflected back to the inside of the display panel by other film layers cannot pass through the light-blocking layer, thus avoiding the influence of the interfering light on the fingerprint recognition effect.

[0079] In practical applications, in the above display panel provided by the embodiment of the present invention, as Figure 7 shown, it can also include: a planar layer 17 located on the side of the first electrode 11 close to the substrate 10;

[0080] The photosensitive detection unit 15 is located between the substrate 10 and the planar layer 17.

[0081] In this way, the photosensitive detection unit 15 can be isolated from the second electrode 13 through the planar layer 17, ensuring the insulation between the photosensitive detection unit 15 and the second electrode 13, and avoiding the contact between the second electrode 13 and the photosensitive detection unit 15, which may cause abnormalities in the display signal and the fingerprint recognition signal.

[0082] In specific implementation, with reference to Figure 2 , when the photosensitive detection unit 15 is located on the side of the planar layer 17 facing away from the substrate 10, it is necessary to keep the photosensitive detection unit 15 insulated from the second electrode 13. For example, during the process, the pattern of the second electrode 13 can be controlled so that the second electrode 13 does not cover the bottom of the second opening U2.

[0083] Specifically, the above-mentioned photosensitive detection unit 15 can be a photosensitive diode, that is, the photosensitive detection unit 15 can include an N-type semiconductor layer 151, an intrinsic semiconductor layer 152, and a P-type semiconductor layer 153. In addition, the above-mentioned display panel can also include: a plurality of transparent electrodes 19 corresponding to each photosensitive detection unit 15, a plurality of signal lines L corresponding to each photosensitive detection unit 15, and a control circuit; wherein the transparent electrode 19 is located on the side of the photosensitive detection unit 15 away from the base substrate 10, and the P-type semiconductor layer 153 in the photosensitive detection unit 15 is electrically connected to the corresponding signal line L through the transparent electrode 19; the N-type semiconductor layer 151 in the photosensitive detection unit 15 is electrically connected to the control circuit. The above-mentioned transparent electrode 19 can be made of transparent conductive materials such as indium tin oxide, so as not to affect the reflected light of the finger F from being emitted to the fingerprint recognition unit 15.

[0084] like Figure 2 As shown, the control circuit may include a first transistor TFT1 and a second transistor TFT2, wherein the first transistor TFT1 may include a first active layer T1, a first gate G1, a first source S1, and a first drain D1, and the first electrode 11 is electrically connected to the first drain D1, so that the light emitting layer 14 may be controlled to emit light through the first transistor TFT1. The second transistor TFT2 may include a second active layer T2, a second gate G2, a second source S2, and a second drain D2, and the N-type semiconductor layer 151 in the photosensitive detection unit 15 is electrically connected to the second source S2, so that the fingerprint recognition process may be controlled through the second transistor TFT2.

[0085] In a specific implementation, in the above display panel provided by the embodiment of the present invention, if Figure 8 As shown, it may also include: an organic inhibition layer located between the light-emitting layer 14 and the second electrode 13;

[0086] The organic suppression layer includes: a plurality of organic suppression units 201 corresponding to the photosensitive detection units 15 respectively.

[0087] In the actual process, an evaporation process is generally adopted and an open mask is used to fabricate the second electrode 13. However, since it is impossible to set shielding portions corresponding to the respective third openings U3 in the open mask, it is impossible to directly form the patterned second electrode 13 using the open mask. In the implementation of the present invention, by using a mask to shield the positions other than the respective photosensitive detection units 15, an organic inhibition layer is formed by an evaporation process. The organic inhibition layer includes a plurality of organic inhibition units 201 respectively corresponding to the respective photosensitive detection units 15. Then, the second electrode is evaporated on the organic inhibition layer using the open mask. Since the organic inhibition layer can inhibit the film formation of the second electrode, the second electrode cannot form a film at the positions of the respective organic inhibition units 201, thereby forming the second electrode 13 having a plurality of third openings U3. Since the organic inhibition layer is a transparent film layer, the organic inhibition units 201 will not affect the reflected light of the finger F from passing through. Therefore, the organic inhibition units 201 do not need to be removed. In addition, the organic inhibition units 201 can also play a role in isolating the second electrode 13 from the photosensitive detection units 15.

[0088] In a second aspect, based on the same inventive concept, an embodiment of the present invention further provides a display device, including: the above-mentioned display panel. The display device can be applied to any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, etc. Since the principle of solving the problem of this display device is similar to that of the above-mentioned display panel, the implementation of this display device can refer to the implementation of the above-mentioned display panel, and the repeated parts will not be described again.

[0089] In a third aspect, based on the same inventive concept, an embodiment of the present invention further provides a manufacturing method of the above-mentioned display panel. Since the principle of solving the problem of this manufacturing method is similar to that of the above-mentioned display panel, the implementation of this manufacturing method can refer to the implementation of the above-mentioned display panel, and the repeated parts will not be described again.

[0090] The manufacturing method of the above-mentioned display panel provided by the embodiment of the present invention, as Figure 9 shown, includes:

[0091] S301. Referring to Figure 10 , a plurality of photosensitive detection units 15 and a plurality of first electrodes 11 are formed on the substrate 10.

[0092] S302. Referring to Figure 11 , a pixel definition layer 12 is formed on the film layer where the first electrode 11 is located, and the pixel definition layer 12 is patterned to obtain a plurality of first openings U1 and a plurality of second openings U2. For example, the pixel definition layer 12 can be formed using a photosensitive material, and a plurality of first openings U1 and a plurality of second openings U2 can be formed using a photolithography process.

[0093] S303. Refer to Figure 12 , and form a light-emitting layer 14 on top of the pixel definition layer 12; in a specific implementation, the light-emitting layer 14 can be formed by an evaporation process;

[0094] S304. Form a patterned second electrode 13 on top of the light-emitting layer 14 to obtain a plurality of third openings U3, and obtain the Figure 2 structure shown.

[0095] In the manufacturing method of the display panel provided by the embodiments of the present invention, by patterning the pixel definition layer, a plurality of second openings corresponding to each photosensitive detection unit are obtained, and a patterned second electrode is formed, and a plurality of third openings corresponding to each second opening are obtained, so that the reflected light of the finger directly passes through the third opening and the second opening and shoots towards the photosensitive detection unit, reducing the loss of reflected light, increasing the intensity of the light shooting towards the photosensitive detection unit, and improving the fingerprint recognition accuracy.

[0096] In a specific implementation, before the above step S301, it may further include: forming a control circuit on the substrate 10, specifically, forming each film layer of the first transistor TFT1 and the second transistor TFT2, and forming a planarization layer 17. After the above step S301 and before the above step S302, it may further include: forming a plurality of transparent electrodes 19 and a plurality of signal lines L corresponding to the photosensitive detection units 15 respectively.

[0097] After the above step S302 and before the above step S303, it may further include: forming the spacer 18 and the support structure 16 by using the same patterning process. In the above step S303, it may further include: forming functional layers such as a hole injection layer, a hole transport layer, an electron injection layer, and an electron transport layer.

[0098] Specifically, in the manufacturing method provided by the embodiments of the present invention, the above step S304 may include:

[0099] As Figure 13 shown, use a mask plate M to block the positions except for each photosensitive detection unit 15, and evaporate an organic inhibition layer on top of the light-emitting layer 14, Figure 13 where the downward arrow in represents the evaporation process; the organic inhibition layer is used to inhibit the formation of the second electrode film; as Figure 14 shown, the formed organic inhibition layer includes: a plurality of organic inhibition units 201 corresponding to each photosensitive detection unit 15 respectively;

[0100] Evaporate the second electrode 13 on top of the organic inhibition layer to form a patterned second electrode 13, and obtain the Figure 2 structure shown.

[0101] In the actual process, the evaporation process is generally adopted and an open mask is used to fabricate the second electrode 13. However, since the shielding portions corresponding to the respective third openings U3 cannot be provided in the open mask, the patterned second electrode 13 cannot be directly formed by using the open mask. In the implementation of the present invention, the positions except for the respective photosensitive detection units 15 are shielded by using a mask, and an organic inhibition layer is formed by using the evaporation process. The organic inhibition layer includes a plurality of organic inhibition units 201 corresponding to the respective photosensitive detection units 15. Then, the second electrode is evaporated on the organic inhibition layer by using the open mask. Since the organic inhibition layer can inhibit the film formation of the second electrode, the second electrode cannot form a film at the positions of the respective organic inhibition units 201, thereby forming the second electrode 13 having a plurality of third openings U3. Since the organic inhibition layer is a transparent film layer, the organic inhibition units 201 do not affect the reflected light of the finger F from passing through. Therefore, the organic inhibition units 201 do not need to be removed.

[0102] The display panel, a manufacturing method thereof and a display device provided by the embodiments of the present invention are provided. By providing a plurality of second openings corresponding to the respective photosensitive detection units in the pixel definition layer, and providing a plurality of third openings corresponding to the respective second openings in the second electrode, and the orthographic projection of the third opening on the substrate has an overlapping area with the orthographic projection of the corresponding photosensitive detection unit on the substrate, so that the reflected light of the finger directly passes through the third opening and the second opening and irradiates the photosensitive detection unit, reducing the loss of the reflected light, increasing the intensity of the light irradiating the photosensitive detection unit, and improving the fingerprint recognition accuracy.

[0103] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A display panel, characterized in that, Comprising: A substrate, a plurality of first electrodes located on the substrate, a pixel definition layer located on a side of the first electrodes facing away from the substrate, a second electrode located on a side of the pixel definition layer facing away from the substrate, a light-emitting layer located between the first electrode and the second electrode, and a plurality of photosensitive detection units located on a side of the light-emitting layer facing away from the second electrode; The pixel definition layer includes: a plurality of first openings respectively exposing the first electrodes, and a plurality of second openings respectively corresponding to the photosensitive detection units; The second electrode includes: a plurality of third openings respectively corresponding to the second openings; A positive projection of the third opening on the substrate and a positive projection of the corresponding photosensitive detection unit on the substrate have an overlapping area; The photosensitive detection units are located in a non-opening area between sub-pixels, and a positive projection of the photosensitive detection unit on the substrate and a positive projection of the first opening on the substrate do not overlap.

2. The display panel according to claim 1, characterized in that, The second electrode covers sidewalls of the second openings; In a direction from the substrate towards the light-emitting layer, a cross-sectional area of the second opening in a direction parallel to the substrate gradually increases.

3. The display panel according to claim 2, characterized in that, Further comprising: A plurality of support structures located between the pixel definition layer and the second electrode; The support structure includes a fourth opening corresponding to the second opening; The second electrode covers sidewalls of the fourth opening; In a direction from the substrate towards the light-emitting layer, a cross-sectional area of the fourth opening in a direction parallel to the substrate gradually increases.

4. The display panel according to claim 3, characterized in that, A first inclination angle is greater than or equal to a second inclination angle; The first inclination angle is an angle between a sidewall of the second opening and a bottom surface of the pixel definition layer; the bottom surface of the pixel definition layer is a surface of the pixel definition layer close to the substrate side; The second inclination angle is an angle between a sidewall of the fourth opening and a top surface of the pixel definition layer; the top surface of the pixel definition layer is a surface of the pixel definition layer away from the substrate side.

5. The display panel according to claim 4, characterized in that, The first inclination angle is greater than or equal to 45° and less than 90°; The second inclination angle is greater than or equal to 15° and less than or equal to 45°.

6. The display panel according to claim 3, characterized in that, The sidewall of the second opening is a plane or a curved surface; The sidewall of the fourth opening is a plane or a curved surface.

7. The display panel according to claim 1, characterized in that, The pixel definition layer includes an opaque material.

8. The display panel according to claim 1, characterized in that, Further comprising: A planar layer located on a side of the first electrode close to the substrate; The photosensitive detection units are located between the substrate and the planar layer.

9. The display panel according to any one of claims 1 to 8, characterized in that, Further comprising: An organic suppression layer located between the light-emitting layer and the second electrode; The organic suppression layer includes: a plurality of organic suppression units respectively corresponding to the photosensitive detection units.

10. A display device, characterized in that, Comprising: A display panel according to any one of claims 1 to 9.

11. A method for manufacturing a display panel according to any one of claims 1 to 9, characterized in that, Comprising: Forming a plurality of photosensitive detection units and a plurality of first electrodes on a substrate; Forming a pixel definition layer on a film layer where the first electrode is located, and patterning the pixel definition layer to obtain a plurality of first openings and a plurality of second openings; Forming a light-emitting layer on the pixel definition layer; A patterned second electrode is formed over the light-emitting layer to obtain a plurality of third openings.

12. The manufacturing method according to claim 11, characterized in that, The forming of the patterned second electrode over the light-emitting layer to obtain a plurality of third openings includes: Using a mask plate to block positions except each photosensitive detection unit, and evaporating an organic inhibition layer over the light-emitting layer; the organic inhibition layer is used to inhibit the film formation of the second electrode; Evaporating the second electrode over the organic inhibition layer to form the patterned second electrode.

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