Display panel and display device

Abstract

The present invention discloses a display panel and a display device. The display panel includes a fingerprint recognition area and a non-fingerprint recognition area; the display panel also includes: a pixel defining layer arranged on one side of a base substrate, the pixel defining layer including a separator and a plurality of openings for accommodating sub-pixel units; an encapsulation layer arranged on the side of the pixel defining layer and the sub-pixel unit away from the base substrate; a color filter layer arranged on the side of the encapsulation layer away from the pixel defining layer and the sub-pixel unit, the color filter layer including a shading layer arranged corresponding to the separator and a color resistance arranged corresponding to the sub-pixel unit; wherein the shading layer located in the fingerprint recognition area includes at least a first shading area, the first shading area includes at least an infrared quantum dot layer; after the visible light emitted by the sub-pixel unit is reflected by the fingerprint to the infrared quantum dot layer, the infrared quantum dot layer emits infrared light to irradiate the fingerprint recognition module. This solution can realize the fingerprint recognition function while ensuring that the reflectivity of the display panel is not increased.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] With the continuous development of display technology, under-screen fingerprint, as a new technological breakthrough in touch screens, has gradually been applied to displays. Under-screen fingerprint refers to a fingerprint recognition sensor integrated under the display screen, which responds to the user's touch operation on a preset position on the display screen to collect the user's fingerprint information. This fingerprint information can be used for fingerprint recognition in scenarios such as payment or unlocking.

[0003] In order to improve the light transmittance of the display and reduce power consumption, existing displays usually use a light shielding layer + color resistance structure to replace the traditional polarizer. However, since the light shielding layer is usually made of opaque material, if the fingerprint recognition function under the display is to be realized, it is necessary to design a hole in the light shielding layer to provide a fingerprint recognition light path, which will increase the reflectivity of the display and reduce the contrast, affecting the display effect. Summary of the invention

[0004] The present invention provides a display panel and a display device, which can realize an under-screen fingerprint recognition function of the display panel while ensuring that the reflectivity of the display panel is not increased.

[0005] In a first aspect, an embodiment of the present invention provides a display panel, the display panel comprising a fingerprint recognition area and a non-fingerprint recognition area; the display panel further comprises:

[0006] A pixel defining layer is arranged on one side of the base substrate, and the pixel defining layer includes a separator and a plurality of openings for accommodating sub-pixel units;

[0007] An encapsulation layer is arranged on a side of the pixel defining layer and the sub-pixel unit away from the substrate;

[0008] A color filter layer is arranged on a side of the encapsulation layer away from the pixel defining layer and the sub-pixel unit, the color filter layer comprising a light shielding layer arranged corresponding to the separator and a color resist arranged corresponding to the sub-pixel unit;

[0009] The light shielding layer located in the fingerprint recognition area includes at least a first light shielding area, and the first light shielding area includes at least an infrared quantum dot layer;

[0010] After the visible light emitted by the sub-pixel unit is reflected by the fingerprint to the infrared quantum dot layer, the infrared quantum dot layer emits infrared light to irradiate the fingerprint recognition module.

[0011] In the display panel as above, optionally, the light shielding layer located in the fingerprint recognition area further includes a second light shielding area;

[0012] Preferably, the first light-shielding area is an area corresponding to the fingerprint recognition module, and the second light-shielding area is an area of ​​the light-shielding layer other than the first light-shielding area.

[0013] In the display panel as above, optionally, the second light-shielding area is made of black light-shielding material;

[0014] The light-shielding layer located in the non-fingerprint recognition area is made of black light-shielding material.

[0015] In the display panel as above, optionally, the light shielding layer further comprises: a light control layer, which is arranged on a side of the infrared quantum dot layer away from the encapsulation layer, or on a side of the infrared quantum dot layer close to the encapsulation layer.

[0016] In the display panel as above, optionally, the light control layer includes a plurality of meta-lenses, and one meta-lens corresponds to one fingerprint recognition sensor in the fingerprint recognition module;

[0017] Preferably, the metalens comprises a plurality of nanoantennas arranged in an array;

[0018] Preferably, the shape of the nanoantenna is at least one of a cuboid, a cylinder, a three-dimensional T-shape, and a three-dimensional V-shape;

[0019] Preferably, when the shape of the nanoantenna is a cuboid, the length, width and height of the nanoantenna are all in the range of 700-1500 nm, the placement angle of the nanoantenna is in the range of 0°-360°, and the distance between two adjacent nanoantennas is greater than or equal to 800 nm.

[0020] In the display panel as above, optionally, the light control layer includes a plurality of micro lenses, and one micro lens corresponds to one fingerprint recognition sensor in the fingerprint recognition module;

[0021] Preferably, the microlens comprises a first lens unit and a second lens unit which are aligned with each other, and a surface where the first lens unit and the second lens unit are aligned with each other is a convex surface;

[0022] Preferably, when the convex surface of the first lens unit faces the light emitting direction, the refractive index of the second lens unit is greater than that of the first lens unit; when the convex surface of the first lens unit faces away from the light emitting direction, the refractive index of the first lens unit is greater than that of the second lens unit.

[0023] In the display panel as above, optionally, the light shielding layer further comprises: a visible light blocking layer disposed on a side of the infrared quantum dot layer close to the encapsulation layer, the visible light blocking layer being used to transmit infrared light and block visible light;

[0024] Preferably, the material of the visible light blocking layer is at least one of gallium arsenide GaAs, cadmium telluride CdTe, silicon Si, and germanium Ge.

[0025] For the display panel as above, optionally, the color filter layer further includes:

[0026] A first buffer layer disposed on the side of the light shielding layer and the color resist close to the encapsulation layer; and / or,

[0027] A second buffer layer disposed on a side of the light shielding layer and the color resist away from the encapsulation layer;

[0028] Preferably, the first buffer layer includes scattering particles.

[0029] In the display panel as above, optionally, the infrared quantum dot layer is made of infrared quantum dot material;

[0030] Preferably, the emission wavelength of the infrared quantum dot material is in the range of 800nm-2000nm;

[0031] Preferably, the emission wavelength of the infrared quantum dot material is 940nm;

[0032] Preferably, the infrared quantum dot material is at least one of lead sulfide PbS, lead selenide PbSe, lead telluride PbTe, and cadmium telluride CdTe.

[0033] In a second aspect, an embodiment of the present invention further provides a display device, which includes a display panel having any feature of the first aspect.

[0034] The present invention provides a display panel and a display device. By designing a shading layer located in a fingerprint recognition area, the shading layer does not need to have holes, thereby avoiding the problem of increased reflectivity and reduced contrast of the display panel caused by the holes. At the same time, the shading layer includes at least a first shading area, and the first shading area includes at least an infrared quantum dot layer. After the visible light emitted by the sub-pixel unit is reflected by the fingerprint to the infrared quantum dot layer, the infrared quantum dot layer emits infrared light to irradiate the fingerprint recognition module, thereby realizing the under-screen fingerprint recognition function of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of a top view structure of a display panel provided by an embodiment of the present invention;

[0036] Figure 2 is a schematic cross-sectional structure diagram of a display panel provided by an embodiment of the present invention;

[0037] Figure 3 is a working principle diagram of a display panel provided by an embodiment of the present invention;

[0038] Figure 4 is a schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention;

[0039] Figure 5is a working principle diagram of another display panel provided by an embodiment of the present invention;

[0040] Figure 6 is a schematic diagram of a top view structure of a meta-lens provided by an embodiment of the present invention;

[0041] Figure 7 is a schematic diagram of a cross-sectional structure of a microlens provided by an embodiment of the present invention;

[0042] Figure 8 It is a structural schematic diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0044] At the same time, the description of the drawings and embodiments is illustrative rather than restrictive. The same reference numerals throughout the specification represent the same elements. In addition, for the sake of understanding and ease of description, the thickness of some layers, films, panels, regions, etc. may be exaggerated in the drawings. It is also understood that when an element such as a layer, film, region or substrate is referred to as "on" another element, the element may be directly on the other element or there may be an intermediate element. In addition, "on..." refers to positioning an element on another element or below another element, but does not essentially refer to positioning on the upper side of another element according to the direction of gravity. For ease of understanding, the elements are drawn on the upper side of another element in the drawings of the present invention.

[0045] In addition, unless explicitly described to the contrary, the word “comprise” and variations such as “including” or “having” will be understood to imply the inclusion of such elements but not the exclusion of any other elements.

[0046] It should also be noted that the "and / or" mentioned in the embodiments of the present invention refers to any and all combinations including one or more related listed items. "First", "second", "third", etc. are used to describe various components in the embodiments of the present invention, but these components should not be limited by these terms. These terms are only used to distinguish one component from another component. And, unless the context clearly indicates otherwise, the singular forms "a", "a kind of" and "the ()" are also intended to include plural forms.

[0047] When a certain embodiment can be implemented differently, the specific process order can be performed differently from the described order. For example, two processes described successively can be performed substantially at the same time or in the reverse order of the described order.

[0048] The structure of the display panel and the display device and their technical effects are described in detail below.

[0049] In addition, the following embodiments are all illustrated by taking the display panel as a rectangle and the fingerprint recognition area as a circle. In actual applications, the display panel can also be a regular or irregular shape such as a circle or a polygon, and the fingerprint recognition area can also be a regular or irregular shape such as a rectangle or a teardrop. The present invention does not impose any specific limitations on this.

[0050] Figure 1 A schematic diagram of a top view of a display panel provided by an embodiment of the present invention is shown. Figure 1 As shown, the display panel includes a display area AA and a non-display area NAA adjacent to the display area AA. Figure 1 The non-display area NAA surrounds the display area AA. The display area AA is the area of ​​the display panel used to display the picture; the non-display area NAA usually includes peripheral driving components, peripheral wiring, and a fan-out area. Optionally, in order to achieve a narrow frame, if the display panel is a flexible display panel, the non-display area NAA may also include a bending area and a non-bending area, and the bending area is located between the non-bending area and the display area AA, and the frame area of ​​the display panel (located in the non-display area) can be folded back to the back of the display panel.

[0051] The display panel has an under-screen fingerprint recognition function, so the display area AA includes a fingerprint recognition area 10 and a non-fingerprint recognition area 11; wherein a fingerprint recognition module is provided in the fingerprint recognition area 10, and the fingerprint recognition module includes at least one fingerprint recognition sensor. In the embodiment of the present invention, the fingerprint recognition sensor is an infrared fingerprint recognition sensor. The display panel can display images and realize the fingerprint recognition function, which is conducive to realizing a full-screen design of the display panel and reducing the frame.

[0052] In a first exemplary embodiment, Figure 2 A schematic cross-sectional structure diagram of a display panel provided by an embodiment of the present invention is shown. Figure 2 As shown, the display panel includes: a base substrate 100, a pixel defining layer 200 disposed on one side of the base substrate 100, and the pixel defining layer 200 includes a separator 210 and a plurality of openings 220 ( Figure 2 The encapsulation layer 400 is arranged on the side of the pixel defining layer 200 and the sub-pixel unit 300 away from the base substrate 100; the color filter layer 500 is arranged on the side of the encapsulation layer 400 away from the pixel defining layer 200 and the sub-pixel unit 300, and the color filter layer 500 includes a shading layer 51 arranged corresponding to the separator 210 and a color resist 52 arranged corresponding to the sub-pixel unit 300.

[0053] The sub-pixel unit 300 may include, in order, in a direction away from the base substrate 100: an anode, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer, and a cathode. The sub-pixel unit 300 may emit N different colors of light, that is, the sub-pixel unit 300 is divided into N categories, and each of the N categories of sub-pixel units 300 is combined to form a pixel unit; N ≥ 3, and N is an integer. For example, the sub-pixel unit 300 may include a first color sub-pixel unit, a second color sub-pixel unit, and a third color sub-pixel unit, the first color sub-pixel unit emits blue light, the second color sub-pixel unit emits red light, and the third color sub-pixel unit emits green light.

[0054] Correspondingly, the color resist 52 is divided into N different colors, each color corresponding to the color of the light emitted by the sub-pixel unit 300. For example, the color resist 52 includes a first color resist, a second color resist and a third color resist, the first color sub-pixel unit corresponds to the first color resist, the second color sub-pixel unit corresponds to the second color resist, and the third color sub-pixel unit corresponds to the third color resist. The color filter layer 500 can replace the polarizer, avoiding the problem of reducing the light output efficiency of the display panel due to the polarization principle of the polarizer, while reducing the manufacturing cost of the display panel.

[0055] In one embodiment, in the fingerprint recognition area 10 , the fingerprint recognition module 600 is disposed corresponding to the light shielding layer 51 , that is, the orthographic projection of the light shielding layer 51 on the base substrate 100 at least covers the orthographic projection of the fingerprint recognition module 600 on the base substrate 100 .

[0056] Specifically, the light shielding layer 51 located in the fingerprint identification area 10 includes at least a first light shielding area 51a. Optionally, the light shielding layer 51 located in the fingerprint identification area 10 also includes a second light shielding area 51b. The first light shielding area 51a is an area corresponding to the fingerprint identification module 600, and the second light shielding area 51b is an area of ​​the light shielding layer 51 other than the first light shielding area 51a.

[0057] Since the fingerprint recognition module 600 is disposed in the fingerprint recognition area 10, Figure 2 As shown, for the fingerprint recognition area 10, the light shielding layer 51 mainly includes a first light shielding area 51a corresponding to the fingerprint recognition module 600. In order to ensure the accuracy of the fingerprint recognition function under the screen, the orthographic projection of the first light shielding area 51a on the base substrate 100 at least covers the orthographic projection of the fingerprint recognition module 600 on the base substrate 100. The second light shielding area 51b is located around the first light shielding area 51a, and the second light shielding area 51b is made of black light shielding material, that is, the second light shielding area 51b is a traditional black matrix (BM). The size of the second light shielding area 51b is affected by the size of the first light shielding area 51a.

[0058] Similarly, since the fingerprint recognition module 600 is not disposed in the non-fingerprint recognition area 11, Figure 2 As shown, for the non-fingerprint recognition area 11, the light shielding layer 51 is made of black light shielding material, that is, the light shielding layer of the non-fingerprint recognition area 11 is a traditional black matrix. In this way, the manufacturing cost of the display panel can be reduced.

[0059] In one embodiment, the first light shielding area 51a at least includes an infrared quantum dot layer 71. After the visible light emitted by the sub-pixel unit 300 is reflected by the fingerprint to the infrared quantum dot layer 71, the infrared quantum dot layer 71 emits infrared light to irradiate the fingerprint recognition module 600. In order to ensure the optical properties, the thickness of the infrared quantum dot layer 71 is usually less than or equal to 15 μm.

[0060] Figure 3 FIG. 4 shows a working principle diagram of a display panel provided by an embodiment of the present invention. Figure 3 As shown, the visible light emitted by the sub-pixel unit 300 is reflected by the fingerprint to the infrared quantum dot layer 71, and the visible light excites the infrared quantum dot layer 71 to emit infrared light, which is then irradiated to the fingerprint recognition module 600 to facilitate the under-screen fingerprint recognition function of the display panel. In addition, the light shielding layer 51 does not need to be opened, avoiding the problem of increased reflectivity and reduced contrast of the display panel due to the opening of the hole.

[0061] In one embodiment, the infrared quantum dot layer is made of infrared quantum dot material. The luminous wavelength of the infrared quantum dot material is in the range of 800nm-2000nm. Optionally, the luminous wavelength of the infrared quantum dot material is 940nm. Optionally, the infrared quantum dot material is at least one of lead sulfide PbS, lead selenide PbSe, lead telluride PbTe, and cadmium telluride CdTe.

[0062] In one embodiment, the light shielding layer of the first light shielding region 51a may further include: a light control layer 72; the light control layer 72 is arranged on a side of the infrared quantum dot layer 71 away from the encapsulation layer 400 (eg Figure 2 or the light-controlling layer 72 is disposed on a side of the infrared quantum dot layer 71 close to the encapsulation layer 400 .

[0063] The light control layer 72 is used to focus the visible light reflected by the fingerprint and project the focus to the fingerprint recognition module 600 to improve the resolution of fingerprint recognition imaging.

[0064] Furthermore, the light shielding layer of the first light shielding region 51a may further include: a visible light blocking layer 73. Figure 2 As shown, the visible light blocking layer 73 is disposed on the side of the infrared quantum dot layer 71 close to the encapsulation layer 400 .

[0065] The visible light blocking layer 73 is used to transmit infrared light and block visible light, that is, the visible light blocking layer 73 can prevent the visible light emitted by the sub-pixel unit 300 from directly exciting the infrared quantum dot layer 71, thereby avoiding interference of visible light on fingerprint recognition and improving the sensitivity of the fingerprint recognition module 600.

[0066] The material of the visible light blocking layer is at least one of gallium arsenide GaAs, cadmium telluride CdTe, silicon Si, and germanium Ge.

[0067] It should be supplemented that when the light control layer 72 is arranged on the side of the infrared quantum dot layer 71 close to the encapsulation layer 400, the light control layer 72 can be arranged between the visible light blocking layer 73 and the infrared quantum dot layer 71, or between the visible light blocking layer 73 and the encapsulation layer. The embodiment of the present invention does not impose specific restrictions on this.

[0068] In one embodiment, continue to refer to Figure 2 The color filter layer 500 further includes: a first buffer layer 53 and / or a second buffer layer 54 .

[0069] The first buffer layer 53 is arranged on the side of the light-shielding layer 51 and the color resist 52 close to the encapsulation layer 400, and the first buffer layer 53 can improve the adhesion and film-forming properties between the encapsulation layer 400 and the light-shielding layer 51; the second buffer layer 54 is arranged on the side of the light-shielding layer 51 and the color resist 52 away from the encapsulation layer 400, and the second buffer layer 54 can play a role of flattening and protection.

[0070] Optionally, the first buffer layer 53 includes scattering particles 80, which can improve the optical properties of the display panel, evenly scatter infrared light to the fingerprint recognition module 600, and improve the accuracy of the fingerprint recognition module 600. For example, the scattering particles 80 can be made of materials such as titanium dioxide and zirconium dioxide.

[0071] In a second exemplary embodiment, Figure 4 FIG. 4 is a schematic cross-sectional view of another display panel provided by an embodiment of the present invention. Figure 4 As shown, the display panel includes: a base substrate 100, a pixel defining layer 200 disposed on one side of the base substrate 100, and the pixel defining layer 200 includes a separator 210 and a plurality of openings 220 ( Figure 4 The encapsulation layer 400 is arranged on the side of the pixel defining layer 200 and the sub-pixel unit 300 away from the base substrate 100; the color filter layer 500 is arranged on the side of the encapsulation layer 400 away from the pixel defining layer 200 and the sub-pixel unit 300, and the color filter layer 500 includes a shading layer 51 arranged corresponding to the separator 210 and a color resist 52 arranged corresponding to the sub-pixel unit 300.

[0072] The sub-pixel unit 300 may include, in order, in a direction away from the base substrate 100: an anode, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer, and a cathode. The sub-pixel unit 300 may emit N different colors of light, that is, the sub-pixel unit 300 is divided into N categories, and each of the N categories of sub-pixel units 300 is combined to form a pixel unit; N ≥ 3, and N is an integer. For example, the sub-pixel unit 300 may include a first color sub-pixel unit, a second color sub-pixel unit, and a third color sub-pixel unit, the first color sub-pixel unit emits blue light, the second color sub-pixel unit emits red light, and the third color sub-pixel unit emits green light.

[0073] Correspondingly, the color resist 52 is divided into N different colors, each color corresponding to the color of the light emitted by the sub-pixel unit 300. For example, the color resist 52 includes a first color resist, a second color resist and a third color resist, the first color sub-pixel unit corresponds to the first color resist, the second color sub-pixel unit corresponds to the second color resist, and the third color sub-pixel unit corresponds to the third color resist. The color filter layer 500 can replace the polarizer, avoiding the problem of reducing the light output efficiency of the display panel due to the polarization principle of the polarizer, while reducing the manufacturing cost of the display panel.

[0074] In one embodiment, in the fingerprint recognition area 10 , the fingerprint recognition module 600 is disposed corresponding to the light shielding layer 51 , that is, the orthographic projection of the light shielding layer 51 on the base substrate 100 at least covers the orthographic projection of the fingerprint recognition module 600 on the base substrate 100 .

[0075] Specifically, the light shielding layer 51 located in the fingerprint identification area 10 includes a first light shielding area 51 a , wherein the first light shielding area 51 a is an area corresponding to the fingerprint identification module 600 .

[0076] Since the fingerprint recognition module 600 is disposed in the fingerprint recognition area 10, Figure 4 As shown, for the fingerprint recognition area 10, the light shielding layer 51 mainly includes a first light shielding area 51a corresponding to the fingerprint recognition module 600. In order to ensure the accuracy of the fingerprint recognition function under the screen, the orthographic projection of the first light shielding area 51a on the base substrate 100 at least covers the orthographic projection of the fingerprint recognition module 600 on the base substrate 100.

[0077] Similarly, since the fingerprint recognition module 600 is not disposed in the non-fingerprint recognition area 11, Figure 4 As shown, for the non-fingerprint recognition area 11, the light shielding layer 51 is made of black light shielding material, that is, the light shielding layer of the non-fingerprint recognition area 11 is a traditional black matrix. In this way, the manufacturing cost of the display panel can be reduced.

[0078] The light shielding layer 51 (i.e., the first light shielding area 51a) located in the fingerprint recognition area 10 includes at least an infrared quantum dot layer 71. After the visible light emitted by the sub-pixel unit 300 is reflected by the fingerprint to the infrared quantum dot layer 71, the infrared quantum dot layer 71 emits infrared light to irradiate the fingerprint recognition module 600. In order to ensure the optical properties, the thickness of the infrared quantum dot layer 71 is usually less than or equal to 15 μm.

[0079] Figure 5 FIG. 4 shows a working principle diagram of another display panel provided by an embodiment of the present invention. Figure 5 As shown, the visible light emitted by the sub-pixel unit 300 is reflected by the fingerprint to the infrared quantum dot layer 71, and the visible light excites the infrared quantum dot layer 71 to emit infrared light, which is then irradiated to the fingerprint recognition module 600 to facilitate the under-screen fingerprint recognition function of the display panel. In addition, the light shielding layer 51 does not need to be opened, avoiding the problem of increased reflectivity and reduced contrast of the display panel due to the opening of the hole.

[0080] In one embodiment, the infrared quantum dot layer is made of infrared quantum dot material. The luminous wavelength of the infrared quantum dot material is in the range of 800nm-2000nm. Optionally, the luminous wavelength of the infrared quantum dot material is 940nm. Optionally, the infrared quantum dot material is at least one of lead sulfide PbS, lead selenide PbSe, lead telluride PbTe, and cadmium telluride CdTe.

[0081] In one embodiment, the light shielding layer of the first light shielding region 51a may further include: a light control layer 72; the light control layer 72 is arranged on a side of the infrared quantum dot layer 71 away from the encapsulation layer 400 (eg Figure 4 or the light-controlling layer 72 is disposed on a side of the infrared quantum dot layer 71 close to the encapsulation layer 400 .

[0082] The light control layer 72 is used to focus the visible light reflected by the fingerprint and project the focus to the fingerprint recognition module 600 to improve the resolution of fingerprint recognition imaging.

[0083] Furthermore, the light shielding layer of the first light shielding region 51a may further include: a visible light blocking layer 73. Figure 4 As shown, the visible light blocking layer 73 is disposed on the side of the infrared quantum dot layer 71 close to the encapsulation layer 400 .

[0084] The visible light blocking layer 73 is used to transmit infrared light and block visible light, that is, the visible light blocking layer 73 can prevent the visible light emitted by the sub-pixel unit 300 from directly exciting the infrared quantum dot layer 71, thereby avoiding interference of visible light on fingerprint recognition and improving the sensitivity of the fingerprint recognition module 600.

[0085] The material of the visible light blocking layer is at least one of gallium arsenide GaAs, cadmium telluride CdTe, silicon Si, and germanium Ge.

[0086] It should be supplemented that when the light control layer 72 is arranged on the side of the infrared quantum dot layer 71 close to the encapsulation layer 400, the light control layer 72 can be arranged between the visible light blocking layer 73 and the infrared quantum dot layer 71, or between the visible light blocking layer 73 and the encapsulation layer. The embodiment of the present invention does not impose specific restrictions on this.

[0087] In one embodiment, continue to refer to Figure 4 The color filter layer 500 further includes: a first buffer layer 53 and / or a second buffer layer 54 .

[0088] The first buffer layer 53 is arranged on the side of the light-shielding layer 51 and the color resist 52 close to the encapsulation layer 400, and the first buffer layer 53 can improve the adhesion and film-forming properties between the encapsulation layer 400 and the light-shielding layer 51; the second buffer layer 54 is arranged on the side of the light-shielding layer 51 and the color resist 52 away from the encapsulation layer 400, and the second buffer layer 54 can play a role of flattening and protection.

[0089] Optionally, the first buffer layer 53 includes scattering particles 80, which can improve the optical properties of the display panel, evenly scatter infrared light to the fingerprint recognition module 600, and improve the accuracy of the fingerprint recognition module 600. For example, the scattering particles 80 can be made of materials such as titanium dioxide and zirconium dioxide.

[0090] For the above two exemplary embodiments, the light control layer 72 can be implemented by a meta-lens or a micro-lens.

[0091] When the light control layer 72 is implemented by a meta-lens, the light control layer 72 includes a plurality of meta-lenses, and one meta-lens corresponds to one fingerprint recognition sensor in the fingerprint recognition module 600 .

[0092] Figure 6 FIG. 2 shows a schematic diagram of a top view structure of a meta-lens provided by an embodiment of the present invention. Figure 6 As shown, a meta-lens includes a plurality of array-arranged nano-antennas A; the shape of the nano-antenna A is at least one of a rectangular parallelepiped, a cylinder, a three-dimensional T-shape, and a three-dimensional V-shape.

[0093] When the shape of the nanoantenna A is a rectangular parallelepiped, the length, width and height of the nanoantenna A are all within the range of 700-1500nm, the placement angle of the nanoantenna A is within the range of 0°-360°, and the distance between two adjacent nanoantennas A is greater than or equal to 800nm.

[0094] It can be understood that the placement angle of the nanoantenna A is the angle between the orthographic projection of the nanoantenna A on the substrate 100 and any side edge of the substrate 100; the distance between two adjacent nanoantennas A refers to the distance between the center points of two adjacent nanoantennas A.

[0095] The material of the nano-antenna A is selected from a material that can transmit infrared light and absorb visible light. For example, the material of the nano-antenna A is any one of gallium arsenide GaAs, cadmium telluride CdTe, silicon Si, and germanium Ge.

[0096] When the light control layer 72 is implemented by a microlens, the light control layer 72 includes a plurality of microlenses, and one microlens corresponds to one fingerprint recognition sensor in the fingerprint recognition module 600 .

[0097] Figure 7 FIG. 2 shows a schematic cross-sectional structure diagram of a microlens provided by an embodiment of the present invention. Figure 7 As shown, the microlens includes a first lens unit B1 and a second lens unit B2 that are aligned with each other, and a surface where the first lens unit B1 and the second lens unit B2 are aligned is a convex surface.

[0098] The bottom shape of the microlens is designed according to the opening shape of the infrared quantum dot layer 71. Usually, the bottom shape of the microlens is circular. Figure 7 It can be seen that when the bottom of the microlens is circular, the ratio of the bottom diameter d of the microlens to the height h of the first lens unit B1 is in the range of 2 to 40. The overall height h1 of the microlens>the height h of the first lens unit B1.

[0099] When the convex surface of the first lens unit B1 faces the light emitting direction, the refractive index of the second lens unit B2 is greater than the refractive index of the first lens unit B1; when the convex surface of the first lens unit B1 faces away from the light emitting direction, the refractive index of the first lens unit B1 is greater than the refractive index of the second lens unit B2.

[0100] It should also be noted that the above embodiments of the present invention are described by taking the fingerprint recognition module 600 integrated in the display panel as an example (usually the fingerprint recognition module 600 is integrated in the driving layer of the display panel); the fingerprint recognition module 600 can also be set in an external manner under the display panel.

[0101] When the fingerprint recognition module 600 is externally mounted under the display panel and the shading area includes the light control layer 72, the light control layer 72 can replace the geometric lens structure in the external fingerprint recognition module 600, thereby further reducing the overall thickness and production cost of the display panel.

[0102] In addition, the driving layer (i.e., thin film transistor) of the display panel is usually arranged between the base substrate 100, the pixel defining layer 200, and the sub-pixel unit 300, and is used to drive the sub-pixel unit 300 to emit light. Specifically, the thin film transistor includes: a buffer film layer located on the base substrate, an active layer located on the buffer film layer, a gate insulating layer located on the active layer, a gate located on the gate insulating layer, an interlayer insulating layer located on the gate, a source electrode and a drain electrode located on the interlayer insulating layer; a passivation layer located on the source electrode and the drain electrode; wherein the source electrode and the drain electrode can be located on the same layer and obtained by a single patterning process, and therefore, the source electrode and the drain electrode can also be referred to as a source-drain metal layer.

[0103] The encapsulation layer 400 may include at least one inorganic encapsulation layer and at least one organic encapsulation layer, wherein the inorganic encapsulation layer and the organic encapsulation layer are sequentially overlapped.

[0104] An embodiment of the present invention provides a display panel, including a fingerprint recognition area and a non-fingerprint recognition area; the display panel also includes: a pixel defining layer arranged on one side of a base substrate, the pixel defining layer including a separator and a plurality of openings for accommodating sub-pixel units; an encapsulation layer arranged on a side of the pixel defining layer and the sub-pixel unit away from the base substrate; a color filter layer arranged on a side of the encapsulation layer away from the pixel defining layer and the sub-pixel unit, the color filter layer including a shading layer arranged corresponding to the separator and a color resist arranged corresponding to the sub-pixel unit; wherein the shading layer located in the fingerprint recognition area includes at least a first shading area, the first shading area includes at least an infrared quantum dot layer; after the visible light emitted by the sub-pixel unit is reflected by the fingerprint to the infrared quantum dot layer, the infrared quantum dot layer emits infrared light to irradiate the fingerprint recognition module. By designing the shading layer located in the fingerprint recognition area, the shading layer does not need to have holes, thereby avoiding the problem of increased reflectivity and reduced contrast of the display panel caused by the holes; at the same time, the shading layer includes at least a first shading area, and the first shading area includes at least an infrared quantum dot layer. After the visible light emitted by the sub-pixel unit is reflected by the fingerprint to the infrared quantum dot layer, the infrared quantum dot layer emits infrared light to irradiate the fingerprint recognition module, thereby realizing the under-screen fingerprint recognition function of the display panel.

[0105] An embodiment of the present invention further provides a display device, Figure 8 FIG. 1 is a schematic diagram showing the structure of a display device provided by an embodiment of the present invention. Figure 8 As shown, the display device 90 includes a display panel 91 provided by any embodiment of the present invention.

[0106] The display device 90 may further include a front camera and a sensor. The front camera and the sensor are correspondingly arranged below the display area of ​​the display panel 91. Optionally, in addition to the front camera and the sensor, other devices such as a gyroscope or an earpiece may be arranged below the display area.

[0107] Among them, the display panel 91 can be any one of the display panels such as an organic light-emitting diode (OLED) display panel, an in-plane switching (IPS) display panel, a twisted nematic (TN) display panel, a vertical alignment technology (VA) display panel, an electronic paper, a QLED (Quantum Dot Light Emitting Diodes, quantum dot luminescence) display panel or a micro LED (micro light-emitting diode, μLED) display panel, and the present invention does not specifically limit this. The light emission mode of the display panel 91 can be top emission, bottom emission or double-sided emission.

[0108] The display device 90 provided in the embodiment of the present invention can be applied to smart wearable devices (such as smart bracelets, smart watches), and can also be applied to smart phones, tablet computers, monitors and other devices.

[0109] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that: The display panel includes a fingerprint recognition area and a non-fingerprint recognition area; the display panel also includes: A pixel defining layer disposed on one side of the base substrate, the pixel defining layer comprising a separator and a plurality of openings for accommodating sub-pixel units; An encapsulation layer is disposed on a side of the pixel defining layer and the sub-pixel unit away from the substrate; A color filter layer is arranged on a side of the encapsulation layer away from the pixel defining layer and the sub-pixel unit, wherein the color filter layer includes a light shielding layer arranged corresponding to the separator and a color resist arranged corresponding to the sub-pixel unit; Wherein, the light shielding layer located in the fingerprint identification area includes at least a first light shielding area, and the first light shielding area includes at least an infrared quantum dot layer; After the visible light emitted by the sub-pixel unit is reflected by the fingerprint to the infrared quantum dot layer, the infrared quantum dot layer emits infrared light to irradiate the fingerprint recognition module; The light shielding layer further includes: a light control layer, which is arranged on a side of the infrared quantum dot layer away from the encapsulation layer, or on a side of the infrared quantum dot layer close to the encapsulation layer.

2. The display panel according to claim 1, characterized in that: The light shielding layer located in the fingerprint identification area further includes a second light shielding area; The first light-shielding area is an area corresponding to the fingerprint recognition module, and the second light-shielding area is an area of ​​the light-shielding layer excluding the first light-shielding area.

3. The display panel according to claim 2, characterized in that: The second light-shielding area is made of black light-shielding material; The light shielding layer located in the non-fingerprint recognition area is made of black light shielding material.

4. The display panel according to claim 1, characterized in that: The light control layer includes a plurality of meta-lenses, and one meta-lens corresponds to one fingerprint recognition sensor in the fingerprint recognition module.

5. The display panel according to claim 4, characterized in that: The meta-lens includes a plurality of nano-antennas arranged in an array.

6. The display panel according to claim 5, characterized in that: The shape of the nano-antenna is at least one of a cuboid, a cylinder, a three-dimensional T-shape, and a three-dimensional V-shape.

7. The display panel according to claim 6, characterized in that: When the shape of the nanoantenna is a rectangular parallelepiped, the length, width and height of the nanoantenna are all in the range of 700-1500nm, the placement angle of the nanoantenna is in the range of 0°-360°, and the distance between two adjacent nanoantennas is greater than or equal to 800nm.

8. The display panel according to claim 1, characterized in that: The light control layer includes a plurality of micro lenses, and one micro lens corresponds to one fingerprint recognition sensor in the fingerprint recognition module.

9. The display panel according to claim 8, characterized in that: The microlens comprises a first lens unit and a second lens unit which are aligned with each other, and a surface where the first lens unit and the second lens unit are aligned with each other is a convex surface.

10. The display panel according to claim 9, characterized in that: When the convex surface of the first lens unit faces the light emitting direction, the refractive index of the second lens unit is greater than the refractive index of the first lens unit; when the convex surface of the first lens unit faces away from the light emitting direction, the refractive index of the first lens unit is greater than the refractive index of the second lens unit.

11. The display panel according to any one of claims 1 to 3, characterized in that: The light shielding layer further includes: a visible light blocking layer disposed on a side of the infrared quantum dot layer close to the encapsulation layer, wherein the visible light blocking layer is used for transmitting infrared light and blocking visible light.

12. The display panel according to claim 11, characterized in that: The material of the visible light blocking layer is at least one of gallium arsenide GaAs, cadmium telluride CdTe, silicon Si, and germanium Ge.

13. The display panel according to claim 1, characterized in that: The color filter layer further comprises: A first buffer layer disposed on the light shielding layer and the color resist on a side close to the encapsulation layer; and / or, A second buffer layer is disposed on a side of the light shielding layer and the color resist away from the encapsulation layer.

14. The display panel according to claim 13, characterized in that: The first buffer layer includes scattering particles.

15. The display panel according to claim 1, characterized in that: The infrared quantum dot layer is made of infrared quantum dot material.

16. The display panel according to claim 15, characterized in that: The luminescent wavelength of the infrared quantum dot material is in the range of 800nm-2000nm.

17. The display panel according to claim 16, characterized in that: The luminous wavelength of the infrared quantum dot material is 940nm.

18. The display panel according to claim 15, characterized in that: The infrared quantum dot material is at least one of lead sulfide PbS, lead selenide PbSe, lead telluride PbTe, and cadmium telluride CdTe.

19. A display device, characterized in that: Comprising a display panel as described in any one of claims 1-18.

Images