Display device

Abstract

This application provides a display device with a fingerprint detection area. The display device includes: a substrate; a light-emitting unit disposed on the substrate for emitting visible light as excitation light for fingerprint recognition; the excitation light irradiates a finger above the fingerprint detection area to form fingerprint detection light carrying fingerprint information on the finger; an optical sensing unit disposed on the substrate for receiving the fingerprint detection light to acquire a fingerprint image of the finger; and a first focusing structure and / or a second focusing structure, wherein the first focusing structure is located on the side of the light-emitting unit away from the substrate for converging the excitation light; and the second focusing structure is located on the side of the optical sensing unit away from the substrate for converging the fingerprint detection light. This display device has high light utilization, accelerates fingerprint recognition, and improves fingerprint recognition performance.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a display device. Background Technology

[0002] Fingerprint recognition has become a feature found on most mobile phones, tablets, and other display devices. With smartphones entering the era of full-screen displays and screen-to-body ratios increasing, under-display fingerprint recognition technology has naturally become a trend.

[0003] Currently, display devices use self-emissive display units as light sources to illuminate the screen. The light emitted by the self-emissive display units in the fingerprint detection area of ​​the display screen forms a light spot that shines on the finger above the display screen to form fingerprint detection light. The fingerprint detection light returns and passes through the display screen, and is received by the optical fingerprint sensor below the display screen. The optical fingerprint sensor then captures the fingerprint image to further realize fingerprint recognition.

[0004] However, existing display devices have low light utilization and poor fingerprint recognition performance. Summary of the Invention

[0005] This application provides a display device aimed at solving the problems of low light utilization and poor fingerprint recognition performance in existing display devices.

[0006] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a display device having a fingerprint detection area, the display device comprising: a substrate, a light-emitting unit, an optical sensing unit, and a first light-concentrating structure and / or a second light-concentrating structure; wherein, the light-emitting unit is disposed on the substrate and is used to emit visible light as excitation light for fingerprint recognition; the excitation light irradiates a finger above the fingerprint detection area to form fingerprint detection light carrying fingerprint information on the finger; the optical sensing unit is disposed on the substrate and is used to receive the fingerprint detection light to acquire a fingerprint image of the finger; the first light-concentrating structure and / or the second light-concentrating structure, the first light-concentrating structure being located on the side of the light-emitting unit away from the substrate, is used to converge the excitation light; the second light-concentrating structure being located on the side of the optical sensing unit away from the substrate, is used to converge the fingerprint detection light.

[0007] In one embodiment, it also includes:

[0008] An encapsulation layer is disposed on the side of the light-emitting unit and the optical sensing unit facing away from the substrate; the first light-concentrating structure and / or the second light-concentrating structure are disposed within the encapsulation layer.

[0009] In one embodiment, the encapsulation layer includes a first inorganic layer, an organic layer, and a second inorganic layer stacked sequentially; the second inorganic layer is located on the side of the first inorganic layer facing away from the substrate.

[0010] The first light-concentrating structure and / or the second light-concentrating structure are located between the first inorganic layer and the organic layer.

[0011] In one embodiment, it also includes:

[0012] A pixel defining layer defines a pixel opening, and portions of the light-emitting unit and the optical sensing unit are formed in the pixel opening; a first inorganic layer is disposed on the side of the pixel defining layer opposite to the substrate, and a groove is formed at the position corresponding to the pixel opening;

[0013] The first light-concentrating structure is located between the first inorganic layer and the organic layer, and a portion of the first light-concentrating structure is embedded in the groove, while the remaining portion of the first light-concentrating structure covers the opening of the groove; and the orthogonal projection of the first light-concentrating structure on the substrate covers the orthogonal projection of the light-emitting unit on the substrate; and / or

[0014] The second light-concentrating structure is located between the first inorganic layer and the organic layer, and the entire second light-concentrating structure is embedded in the groove.

[0015] In one embodiment, it also includes:

[0016] A pixel-defining layer defines and forms pixel openings;

[0017] The encapsulation layer includes a first inorganic layer, a first organic layer, a second organic layer, and a second inorganic layer stacked sequentially; the first organic layer is stacked on the side surface of the first inorganic layer facing away from the substrate, for planarizing the pixel opening; the second inorganic layer is stacked on the side surface of the first inorganic layer facing away from the substrate.

[0018] The first light-concentrating structure is located between the first organic layer and the second organic layer;

[0019] Preferably, the orthogonal projection of the first light-concentrating structure on the substrate covers the orthogonal projection of the light-emitting unit on the substrate;

[0020] Preferably, portions of the light-emitting unit and the optical sensing unit are formed in the pixel opening; the first inorganic layer is disposed on the side surface of the pixel defining layer facing away from the substrate, and a groove is formed at the position corresponding to the pixel opening;

[0021] The second light-concentrating structure is located between the first inorganic layer and the first organic layer, and the entire second light-concentrating structure is embedded in the groove.

[0022] In one embodiment, it also includes:

[0023] An encapsulation layer is disposed on the side of the light-emitting unit and the optical sensing unit facing away from the substrate;

[0024] A protective layer is disposed on the surface of the encapsulation layer opposite to the substrate;

[0025] The first light-concentrating structure is located within the protective layer.

[0026] In one embodiment, the protective layer includes a first protective layer, a functional layer, and a second protective layer stacked sequentially, wherein the functional layer protrudes in a direction away from the substrate corresponding to the position of the light-emitting unit to form the first light-concentrating structure; the functional layer protrudes in a direction closer to the substrate corresponding to the position of the optical sensing unit to form the second light-concentrating structure.

[0027] In one embodiment, the light-emitting unit and the optical sensing unit are arranged on the same layer.

[0028] In one embodiment, the first and second light-focusing structures are made of quantum dots; and / or

[0029] The refractive index of the first light-concentrating structure is greater than the refractive index of other structures between the light-emitting unit and the first light-concentrating structure; the refractive index of the second light-concentrating structure is greater than the refractive index of other structures between the second light-concentrating structure and the display screen.

[0030] Preferably, the light-emitting unit includes a green light-emitting unit, and the quantum dot is a green quantum dot.

[0031] In one embodiment, the first light-concentrating structure is a convex lens structure, and the second light-concentrating structure is a concave lens structure.

[0032] The beneficial effects of the embodiments of this application, which differ from the prior art, are as follows: The display device provided in the embodiments of this application, by setting a first light-concentrating structure on the side of the light-emitting unit away from the substrate, can use the first light-concentrating structure to focus the visible light emitted by the light-emitting unit, thereby increasing the amount of visible light illuminating the fingerprint detection area and improving the light extraction amount of visible light; by setting a second light-concentrating structure on the side of the optical sensing unit away from the substrate, the second light-concentrating structure can use the second light-concentrating structure to focus the fingerprint detection light reflected or refracted back by the finger, thereby increasing the amount of light received by the optical sensing unit and improving the light utilization rate of the fingerprint detection light. The display device achieves rapid fingerprint recognition and effectively improves the fingerprint recognition effect by focusing the light emitted by the light-emitting unit through the first light-concentrating structure and the second light-concentrating structure. Attached Figure Description

[0033] Figure 1 A simplified vertical cross-sectional view of a display device provided in an embodiment of this application;

[0034] Figure 2 A simplified vertical cross-sectional view of a display device provided in a specific embodiment of this application;

[0035] Figure 3 A simplified vertical cross-sectional view of a display device provided in another specific embodiment of this application;

[0036] Figure 4 A simplified vertical cross-sectional view of a display device provided in another specific embodiment of this application.

[0037] Explanation of reference numerals in the attached figures

[0038] 1-Substrate; 2-Driving layer; 3-Pixel limiting layer; 4-Light emission unit; 41-First electrode; 42-Light emission layer; 43-Second electrode; 5-Optical sensing unit; 51-Third electrode; 52-Photoelectric conversion layer; 53-Fourth electrode; 6-First light-concentrating structure; 7-Second light-concentrating structure; 8-Encapsulation layer; 81-First inorganic layer; 82-Organic layer; 821-First organic layer; 822-Second organic layer; 83-Second inorganic layer; 9-Protective layer; 91-First protective layer; 92-Functional layer; 93-Second protective layer. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0040] The terms "first," "second," and "third" in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indications also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0041] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0042] In related technologies, with the trend towards full-screen and ultra-thin designs in terminal devices, it is necessary to integrate fingerprint recognition modules under or on the screen. Currently, under-display optical and ultrasonic fingerprint modules are the mainstream in the market, offering good performance and mature technology. However, these additional modules also increase the cost of the device and occupy extra space. Therefore, it is necessary to develop a fingerprint recognition module that can be integrated on or within the screen to reduce costs and simplify the structure. Furthermore, integrating the fingerprint recognition module with the screen itself also contributes to achieving a thinner and lighter overall device.

[0043] The display device provided in this application embodiment integrates the fingerprint recognition module inside the screen, which can improve the fingerprint recognition effect and achieve fast fingerprint recognition.

[0044] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] Please see Figure 1 , Figure 1This is a simplified vertical cross-sectional view of a display device provided according to an embodiment of this application. In this embodiment, a display device is provided, having a fingerprint detection area. When a user needs to unlock the display device or perform other fingerprint verification, they only need to press their finger on the fingerprint detection area to input their fingerprint. The display device may include a display area, and a portion of the display area can be reused as the fingerprint detection area. The entire display area of ​​the display device can be used for fingerprint input. Alternatively, a portion of the display area of ​​the display device can be used for fingerprint input; that is, fingerprint input is achieved simply by pressing a finger on the display area.

[0046] In some embodiments, the display device includes a substrate 1, a light-emitting unit 4, an optical sensing unit 5, and a first light-concentrating structure 6 and / or a second light-concentrating structure 7. The substrate 1 may be a flexible substrate. The material of the substrate 1 may include any suitable insulating material with flexibility. For example, the material of the substrate 1 may include at least one of polymer materials such as polyimide (PI), polycarbonate (PC), polyethersulfone (PES), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyaryl compounds (PAR), or glass fiber reinforced plastic (FRP). The substrate 1 may be transparent, translucent, or opaque.

[0047] The light-emitting unit 4 and the optical sensing unit 5 are disposed on the substrate 1, and are located on the same side of the substrate 1. Disposing the optical sensing unit 5 on the substrate 1 helps to reduce the path of fingerprint detection light incident on the optical sensing unit 5, thereby improving light utilization and enhancing fingerprint recognition performance. The light-emitting unit 4 and the optical sensing unit 5 can be disposed on the same layer.

[0048] The light-emitting unit 4 includes a first electrode 41, a light-emitting layer 42, and a second electrode 43 stacked sequentially. The first electrode 41 can be an anode, and correspondingly, the second electrode 43 is a cathode. The optical sensing unit 5 includes a third electrode 51, a photoelectric conversion layer 52, and a fourth electrode 53 stacked sequentially. The third electrode 51 can be an anode, and correspondingly, the fourth electrode 53 is a cathode. The first electrode 41 and the third electrode 51 form an anode layer. The first electrode 41 and the third electrode 51 can be arranged in the same layer, and the materials of the first electrode 41 and the third electrode 51 can be the same. The second electrode 43 and the fourth electrode 53 form a cathode layer. The second electrode 43 and the fourth electrode 53 can be arranged in the same layer, and the materials of the second electrode 43 and the fourth electrode 53 can be the same. The first electrode 41 and the third electrode 51 can be arranged alternately, and the second electrode 43 and the fourth electrode 53 can be spaced apart or connected to each other. When forming the cathode, a whole-layer cathode can be prepared, with cathodes in different regions constituting the second electrode 43 and the fourth electrode 53, respectively. The display device may also include a driving layer 2 for driving the light-emitting unit 4 and the optical sensing unit 5. The driving layer 2 is located between the light-emitting unit 4 and the substrate 1. The optical sensing unit 5 can be an organic optical sensor, and the light-emitting unit 4 can be an organic light-emitting device.

[0049] The display device may include only a first focusing structure 6, which is disposed on the side of the light-emitting unit 4 away from the substrate 1 to focus the excitation light; or, the display device may include only a second focusing structure 7, which is located on the side of the optical sensing unit 5 away from the substrate 1 to focus the fingerprint detection light; or, the display device may include both a first focusing structure 6 and a second focusing structure 7. The orthogonal projection of the first focusing structure 6 onto the substrate 1 at least partially covers the orthogonal projection of the light-emitting unit 4 onto the substrate 1 to focus the excitation light. The orthogonal projection of the second focusing structure 7 onto the substrate 1 at least partially covers the orthogonal projection of the optical sensing unit 5 onto the substrate 1 to focus the fingerprint detection light.

[0050] In some embodiments, a second focusing structure 7 may be provided on the side of some optical sensing units 5 away from the substrate 1; or, a second focusing structure 7 may be provided on the side of each optical sensing unit 5 away from the substrate 1. In some embodiments, a first focusing structure 6 may be provided on the side of some light-emitting units 4 away from the substrate 1; or, a first focusing structure 6 may be provided on the side of each light-emitting unit 4 away from the substrate 1.

[0051] In one embodiment, the display device further includes a pixel defining layer 3 disposed on the side of the anode layer away from the substrate 1, and defining a plurality of pixel openings. At least a portion of the anode layer is exposed through the plurality of pixel openings on the surface of the pixel defining layer 3 facing away from the substrate 1. The plurality of pixel openings may be arranged in an array. The anode layer includes a first electrode 41 and a third electrode 51.

[0052] Both the light-emitting unit 4 and the optical sensing unit 5 are disposed on the substrate 1 and are positioned corresponding to the pixel opening. The light-emitting unit 4 is used to emit visible light as the excitation light for fingerprint recognition; such as Figure 1 As shown, excitation light shines on a finger (not shown) above the fingerprint detection area to form fingerprint detection light carrying fingerprint information on the finger; the fingerprint detection light is reflected by the finger and shines through the display screen onto the optical sensing unit 5; the optical sensing unit 5 receives the fingerprint detection light to acquire a fingerprint image of the finger, thereby performing fingerprint recognition. The optical sensing unit 5 includes an organic photodetector (OPD); the optical sensing unit 5 can be a conventional fingerprint recognition module, and its specific structure and function can be found in conventional fingerprint recognition modules located below the display screen.

[0053] like Figure 1 As shown, Figure 1 The following description uses three light-emitting units 4 and one optical sensing unit 5 as an example. Each light-emitting unit 4 includes a first-color light-emitting unit, a second-color light-emitting unit, and a third-color light-emitting unit, wherein one light-emitting unit 4 corresponds to one pixel opening. The light-emitting unit 4 may be partially located within the pixel opening, with the remaining portion formed on the surface of the pixel limiting layer 3 facing away from the substrate 1. For details, please refer to existing related designs, which will not be elaborated here. The first color, second color, and third color are red, green, and blue, respectively.

[0054] In some embodiments, the light-emitting unit 4 and the optical sensing unit 5 are disposed on the same layer; thus, the light-emitting unit 4 and the optical sensing unit 5 can be fabricated simultaneously using the same process, which simplifies the process. Specifically, both the light-emitting unit 4 and the optical sensing unit 5 can be formed using a fine metal mask (FMM) vapor deposition process.

[0055] The first focusing structure 6 is located on the side of the light-emitting unit 4 away from the substrate 1, and is used to focus the light emitted by the light-emitting unit 4, thereby improving the light utilization rate. In a specific embodiment, a first focusing structure 6 is provided on the light-emitting side of each light-emitting unit 4, so as to focus the light emitted by the corresponding light-emitting unit 4 through the first focusing structure 6, thereby improving the light extraction amount of the light-emitting unit 4.

[0056] In one specific embodiment, a first focusing structure 6 can be provided on the light-emitting side of the green light-emitting unit 4 to focus the green light emitted by the green light-emitting unit 4. In this embodiment, the material of the first focusing structure 6 can be further selected as green quantum dots, so that the quantum dots at the corresponding positions can be excited to emit light again by the photons emitted by the green light-emitting unit 4, thereby effectively improving the luminous efficiency of the green light-emitting unit 4, increasing the purity of green light, and further improving the utilization rate of green light.

[0057] Specifically, the refractive index of the first light-concentrating structure 6 can be greater than the refractive index of other structures between the first light-concentrating structure 6 and the corresponding light-emitting unit 4, so that more light is refracted to the fingerprint detection area and the light utilization rate is improved.

[0058] Those skilled in the art will understand that when the first light-emitting structure 6 is also provided on the light-emitting side corresponding to the red light-emitting unit 4, the material of the corresponding first light-emitting structure 6 is red light quantum dots, so that the quantum dots at the corresponding position can be excited to emit light again by the photons emitted by the red light-emitting unit 4, thereby effectively improving the luminous efficiency of the red light-emitting unit 4, increasing the purity of red light, and further improving the utilization rate of red light.

[0059] In some embodiments, the optical sensing unit 5 is sensitive to light within a first wavelength range, and the light-emitting unit 4 includes a first light-emitting unit and a second light-emitting unit. The wavelength of the excitation light emitted by the first light-emitting unit overlaps with at least a portion of the first wavelength range. A first light-concentrating structure 6 is disposed at least on the side of the first light-emitting unit away from the substrate 1. The first light-emitting unit may be a green light-emitting unit; the optical sensing unit 5 is a photosensitive device sensitive to green light.

[0060] In some embodiments, such as Figure 1 As shown, the first light-concentrating structure 6 can be a convex lens structure, that is, at least one convex surface is formed on the side surface of the first light-concentrating structure 6 facing away from the substrate 1; in order to further concentrate the light emitted by the light-emitting unit 4 using the principle of a convex lens, thereby further improving the utilization rate of the corresponding light, accelerating fingerprint recognition and improving the recognition effect. Specifically, the side surface of the first light-concentrating structure 6 facing away from the substrate 1 can form a continuous convex surface; or, the side surface of the first light-concentrating structure 6 facing away from the substrate 1 can also form multiple convex surfaces.

[0061] The second light-concentrating structure 7 is located on the side of the optical sensing unit 5 away from the substrate 1. It is used to converge the fingerprint detection light, thereby improving the utilization rate of the fingerprint detection light and increasing the amount of light received by the optical sensing unit 5, so as to further accelerate fingerprint recognition and improve the recognition effect.

[0062] The second light-concentrating structure 7 can be made of quantum dots, so that the fingerprint detection photons can excite the second light-concentrating structure 7 to emit light again, thereby effectively improving the luminous efficiency of the fingerprint detection light and further improving the light utilization rate.

[0063] In some embodiments, the refractive index of the second light-concentrating structure 7 may be greater than the refractive index of other structures between the display screen and the second light-concentrating structure 7, so that more fingerprint detection light is refracted to the second light-concentrating structure 7, thereby further improving light utilization.

[0064] In some embodiments, the second light-concentrating structure 7 can be a concave lens structure, that is, at least one concave surface is formed on the side surface of the second light-concentrating structure 7 facing away from the substrate 1; this utilizes the principle of a concave lens to further converge the fingerprint detection light, thereby further improving the utilization rate of the corresponding light, accelerating fingerprint recognition, and improving the recognition effect. In one specific embodiment, the second light-concentrating structure 7 forms a continuous concave surface. Of course, in other specific embodiments, the second light-concentrating structure 7 can also form multiple concave surfaces. It should be noted that the convex surfaces involved in this application all refer to the surface of the first light-concentrating structure 6 facing away from the substrate 1 protruding in the direction facing away from the substrate 1; the concave surfaces all refer to the surface of the second light-concentrating structure 7 facing away from the substrate 1 concave in the direction facing closer to the substrate 1. Those skilled in the art will understand that the first light-concentrating structure 6 and / or the second light-concentrating structure 7 can also be rectangular structures, trapezoidal structures, or other irregular shapes.

[0065] The first focusing structure 6 and / or the second focusing structure 7 can be manufactured using inkjet printing technology.

[0066] The above configuration, by setting a first light-concentrating structure 6 on the side of the light-emitting unit 4 away from the substrate 1, can concentrate the visible light emitted by the light-emitting unit 4, increasing the amount of visible light illuminating the fingerprint detection area and improving the light extraction rate, resulting in high light utilization. Simultaneously, by setting a second light-concentrating structure 7 on the side of the optical sensing unit 5 away from the substrate 1, can concentrate the fingerprint detection light reflected back from the finger, increasing the amount of fingerprint detection light received by the optical sensing unit 5. This application utilizes the first light-concentrating structure 6 and the second light-concentrating structure 7 to concentrate the light emitted by the light-emitting unit 4 twice, effectively improving the light utilization rate of the fingerprint detection light. This display device, by concentrating the light emitted by the light-emitting unit 4 through the first light-concentrating structure 6 and the second light-concentrating structure 7, achieves rapid fingerprint recognition and effectively improves the fingerprint recognition effect.

[0067] The encapsulation layer 8 is located on the side of the light-emitting unit 4 and the optical sensing unit 5 away from the substrate 1. It serves to prevent water, oxygen, and other external elements from entering the display device and corroding the structures such as the light-emitting unit 4 and the optical sensing unit 5, thereby extending the lifespan of the display device. The first light-concentrating structure 6 and / or the second light-concentrating structure 7 can be specifically located within the encapsulation layer 8. Compared to other structural layers on the side of the encapsulation layer 8 away from the substrate 1 where the first light-concentrating structure 6 and / or the second light-concentrating structure 7 are located, the first light-concentrating structure 6 can be closer to the light-emitting unit 4, allowing it to gather more visible light emitted by the light-emitting unit 4, thus improving light utilization. Simultaneously, the second light-concentrating structure 7 can be closer to the optical sensing unit 5, enabling more of the fingerprint detection light gathered by the second light-concentrating structure 7 to be transmitted to the optical sensing unit 5, thereby improving the utilization rate of the fingerprint detection light.

[0068] In some specific embodiments, see Figure 2 , Figure 2 This is a simplified vertical cross-sectional view of a display device provided in a specific embodiment of this application. The encapsulation layer 8 includes a first inorganic layer 81, an organic layer 82, and a second inorganic layer 83 stacked sequentially. The first inorganic layer 81 is disposed on the surface of the pixel defining layer 3 facing away from the substrate 1, and encapsulates and covers the light-emitting unit 4 and the optical sensing unit 5; and forms grooves at the positions corresponding to the pixel openings; the second inorganic layer 83 is located on the side of the first inorganic layer 81 facing away from the substrate 1. The first inorganic layer 81 and / or the second inorganic layer 83 may be made of silicon nitride. The organic layer 82 can be fabricated by inkjet printing.

[0069] In this specific embodiment, the first light-concentrating structure 6 and / or the second light-concentrating structure 7 may be specifically located between the first inorganic layer 81 and the organic layer 82, so that the first light-concentrating structure 6 is closer to the light-emitting unit 4 and the second light-concentrating structure 7 is closer to the optical sensing unit 5.

[0070] Specifically, in combination Figure 2 The first light-concentrating structure 6 is located between the first inorganic layer 81 and the organic layer 82, and part of the first light-concentrating structure 6 is embedded in the groove, while the remaining part of the first light-concentrating structure 6 covers the groove opening. The orthographic projection of the first light-concentrating structure 6 on the substrate 1 covers the orthographic projection of the light-emitting unit 4 on the substrate 1. In this way, the first light-concentrating structure 6 can concentrate all the visible light emitted by the light-emitting unit 4, reduce the dispersion of visible light, and improve the light utilization rate.

[0071] Furthermore, the second light-concentrating structure 7 is also located between the first inorganic layer 81 and the organic layer 82, and the entire second light-concentrating structure 7 is embedded within the pixel opening. Thus, during the fabrication of the second light-concentrating structure 7, the second light-concentrating structure 7 can be obtained directly by spraying, utilizing the limiting effect of the pixel opening, without requiring any other special processing, simplifying the process. Simultaneously, the sidewalls of the pixel opening can block the fingerprint detection light converged by the second light-concentrating structure 7, preventing further dispersion of the converged fingerprint detection light and further improving the utilization rate of the fingerprint detection light.

[0072] Of course, the second light-concentrating structure 7 can also be located between the organic layer 82 and the second inorganic layer 83, or on the side of the second inorganic layer 83 away from the organic layer 82.

[0073] In another specific embodiment, see Figure 3 , Figure 3 A simplified vertical cross-sectional view of a display device provided in another specific embodiment of this application; and the above... Figure 2The specific embodiment shown differs in that the organic layer 82 includes a first organic layer 821 and a second organic layer 822 stacked together. The first organic layer 821 is stacked on the surface of the first inorganic layer 81 facing away from the substrate 1, and is used to planarize the pixel aperture; the second inorganic layer 83 is stacked on the surface of the first inorganic layer 81 facing away from the substrate 1. In this specific embodiment, the first light-concentrating structure 6 may be located between the first organic layer 821 and the second organic layer 822.

[0074] In this specific embodiment, the second light-concentrating structure 7 is located between the first inorganic layer 81 and the first organic layer 821, and the entire second light-concentrating structure 7 is embedded within the pixel opening. Of course, the second light-concentrating structure 7 can also be located between the first organic layer 821 and the second organic layer 822; or between the second organic layer 822 and the second inorganic layer 83.

[0075] In yet another specific embodiment, see Figure 4 , Figure 4 This is a simplified vertical cross-sectional view of a display device provided in another specific embodiment of this application. The display device further includes a protective layer 9, which is disposed on the surface of the encapsulation layer 8 facing away from the substrate 1. In this specific embodiment, the first light-concentrating structure 6 is specifically disposed within the protective layer 9.

[0076] In some embodiments, the protective layer 9 includes a first protective layer 91, a functional layer 92, and a second protective layer 93 stacked sequentially. The first protective layer 91 is disposed on the surface of the encapsulation layer 8 facing away from the substrate 1. The functional layer 92 is stacked between the first protective layer 91 and the second protective layer 93. The functional layer 92 protrudes in the direction away from the substrate 1 corresponding to the position of the light-emitting unit 4 to form a first light-concentrating structure 6. The functional layer 92 also protrudes in the direction closer to the substrate 1 corresponding to the position of the optical sensing unit 5 to form a second light-concentrating structure 7.

[0077] The first protective layer 91 and the second protective layer 93 are made of the same material, specifically optical adhesive (OC adhesive), which provides a certain degree of buffering and protection. The functional layer 92 can be made of quantum dots, such as green quantum dots. The refractive index of the functional layer 92 is greater than that of other structures between the light-emitting unit 4 and the functional layer 92; and greater than that of other structures between the functional layer 92 and the display screen. In a specific embodiment, the functional layer 92 can be fabricated using spin coating, slot coating, inkjet printing, or other processes.

[0078] Specifically, the thickness of the functional layer 92 may be less than the thickness of the first protective layer 91 and / or the second protective layer 93, so as to minimize the impact of the functional layer 92 on the overall thickness of the display device and meet the requirements for a thinner and lighter display device.

[0079] Of course, the display device also includes a filter layer, a light guide layer or light path guiding structure, and other optical components. The filter layer can be used to filter out ambient light or other interfering light that penetrates the finger. The light guide layer or light path guiding structure is mainly used to guide the fingerprint detection light formed by the finger above the display screen and returning through the display screen to the second light-focusing structure 7 for optical detection to realize fingerprint image acquisition. The fingerprint detection light can be the excitation light emitted by the fingerprint excitation light source that shines on the finger above the display screen and forms a light signal carrying the fingerprint information by being reflected, scattered, or transmitted by the finger.

[0080] The display device provided in this embodiment, by providing a first light-concentrating structure 6 on the side of the light-emitting unit 4 away from the substrate 1, can use the first light-concentrating structure 6 to focus the visible light emitted by the light-emitting unit 4, thereby increasing the amount of visible light illuminating the fingerprint detection area and improving the light extraction rate of visible light; at the same time, by providing a second light-concentrating structure 7 on the side of the optical sensing unit 5 away from the substrate 1, can use the second light-concentrating structure 7 to focus the fingerprint detection light reflected back from the finger, thereby increasing the amount of light received by the optical sensing unit 5 and improving the light utilization rate of the fingerprint detection light. The display device achieves rapid fingerprint recognition and effectively improves the fingerprint recognition effect by focusing the light emitted by the light-emitting unit 4 through the first light-concentrating structure 6 and the second light-concentrating structure 7.

[0081] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between apparatuses or units, and may be electrical, mechanical, or other forms.

[0082] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0083] The above are merely embodiments of this application and do not limit the scope of this patent application. Any equivalent structural or procedural changes made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A display device having a fingerprint detection area, characterized by comprising: The display device comprises: a substrate, a light-emitting unit arranged on the substrate and configured to emit visible light as excitation light for fingerprint recognition; the excitation light irradiates on a finger above the fingerprint detection area to form fingerprint detection light carrying fingerprint information on the finger; an optical sensing unit arranged on the substrate and located on the same side of the substrate as the light-emitting unit, and configured to receive the fingerprint detection light to collect a fingerprint image of the finger; a first light-concentrating structure located on a side of the light-emitting unit away from the substrate and covering a projection of the light-emitting unit on the substrate, and configured to concentrate the excitation light; and / or a second light-concentrating structure located on a side of the optical sensing unit away from the substrate and covering at least part of a projection of the optical sensing unit on the substrate, and configured to concentrate the fingerprint detection light; an encapsulation layer arranged on a side of the light-emitting unit and the optical sensing unit away from the substrate; and the first light-concentrating structure and / or the second light-concentrating structure are arranged in the encapsulation layer; the encapsulation layer comprises a first inorganic layer, an organic layer and a second inorganic layer stacked in sequence; the second inorganic layer is located on a side of the first inorganic layer away from the substrate; the first light-concentrating structure is located on a side of the first inorganic layer away from the substrate; a pixel definition layer defining a pixel opening, part of the light-emitting unit and the optical sensing unit being formed in the pixel opening; the first inorganic layer is arranged on a side of the pixel definition layer away from the substrate and forms a groove at a position corresponding to the pixel opening; the second light-concentrating structure is located between the first inorganic layer and the organic layer, and the entire second light-concentrating structure is embedded in the groove.

2. The display device according to claim 1, wherein the first light-concentrating structure is located between the first inorganic layer and the organic layer.

3. The display device according to claim 2, wherein Further comprising: part of the first light-concentrating structure is embedded in the groove, and the remaining part of the first light-concentrating structure covers a slot of the groove.

4. The display device according to claim 1, wherein Further comprising: the organic layer comprises a first organic layer and a second organic layer stacked in sequence; the first organic layer is stacked on a side surface of the first inorganic layer away from the substrate, and is configured to planarize the pixel opening; and the second inorganic layer is stacked on a side surface of the first inorganic layer away from the substrate; the first light-concentrating structure is located between the first organic layer and the second organic layer.

5. The display device according to claim 4, wherein the second light-concentrating structure is located between the first inorganic layer and the first organic layer.

6. The display device according to claim 1, wherein Further comprising: a protective layer arranged on a side surface of the encapsulation layer away from the substrate; the first light-concentrating structure is arranged in the protective layer.

7. The display device according to claim 6, wherein The protective layer comprises a first protective layer, a functional layer and a second protective layer which are stacked in sequence, wherein the functional layer is protruded towards the direction away from the substrate corresponding to the position of the light emitting unit to form the first light condensing structure; the functional layer is protruded towards the direction close to the substrate corresponding to the position of the optical sensing unit to form the second light condensing structure. 8.The display device of any one of claims 1-7, characterized in that, the light emitting unit and the optical sensing unit are arranged in the same layer. 9.The display device of any one of claims 1-7, characterized in that, the material of the first light condensing structure and the second light condensing structure is quantum dots; and / or the refractive index of the first light condensing structure is greater than the refractive index of other structures between the light emitting unit and the first light condensing structure; the refractive index of the second light condensing structure is greater than the refractive index of other structures between the second light condensing structure and the display screen. 10.The display device of claim 9, characterized in that, the light emitting unit comprises a green light emitting unit, and the quantum dots are green light quantum dots. 11.The display device of any one of claims 1-7, characterized in that, the first light condensing structure is a convex lens structure, and the second light condensing structure is a concave lens structure. ​

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