A display device

Abstract

The present disclosure provides a display device capable of achieving large-area fingerprint recognition. The display device includes: a display module having a plurality of color filters and a black matrix, wherein the black matrix has a plurality of first openings and a plurality of second openings, and the plurality of color filters are respectively disposed in the plurality of first openings; a fingerprint recognition module located on the opposite side of the display surface of the display module; the fingerprint recognition module includes a plurality of fingerprint recognition devices; the orthographic projection of each fingerprint recognition device on the plane where the display module is located at least completely covers the orthographic projection of one second opening and does not overlap with the orthographic projection of the plurality of first openings; a collimating structure located on the light incident side of the fingerprint recognition module, the collimating structure includes at least two light-shielding layers, each light-shielding layer has a plurality of light-transmitting holes, and the light-transmitting holes in each light-shielding layer correspond to each other and at least partially overlap in the orthographic projection on the plane where the display module is located; one of the light-shielding layers is reused with the black matrix.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display device. Background Art

[0002] With the rapid development of the information industry, biometric technology has been used more and more widely. In particular, since the fingerprints of different users are different, it is convenient to confirm the user's identity. Therefore, fingerprint recognition technology has been widely used in mobile terminals, smart homes and other fields to provide security for user information.

[0003] Optical fingerprint recognition is one of the means to achieve fingerprint recognition. The principle of optical fingerprint recognition is as follows: when a finger is placed above a display product, the light emitted by the light source contained in the display product illuminates the valleys and ridges of the finger, and after being reflected by the valleys and ridges of the finger, it enters the optical fingerprint recognition device contained in the display product. Since the light intensity reflected by the valleys and ridges is different, the fingerprint recognition device generates different electrical signals according to the difference in the reflected light intensity to achieve fingerprint recognition. Summary of the invention

[0004] In view of this, an embodiment of the present disclosure provides a display device that can realize large-area fingerprint recognition.

[0005] Therefore, an embodiment of the present disclosure provides a display device, including:

[0006] A display module, comprising: a plurality of color resists and a black matrix; wherein the black matrix has a plurality of first openings and a plurality of second openings, and the plurality of color resists are arranged in the plurality of first openings in a one-to-one correspondence;

[0007] A fingerprint recognition module is located on the opposite side of the display surface of the display module; the fingerprint recognition module includes a plurality of fingerprint recognition devices; the orthographic projection of each of the fingerprint recognition devices on the plane where the display module is located completely covers at least one orthographic projection of the second opening and does not overlap with the orthographic projections of the plurality of first openings;

[0008] A collimating structure is located on the light incident side of the fingerprint recognition module, and the collimating structure includes at least two light-shielding layers, each of which has a plurality of light-transmitting holes, and the light-transmitting holes in each of the light-shielding layers correspond to each other one by one and the orthographic projections on the plane where the display module is located at least partially overlap; one of the light-shielding layers is reused with the black matrix.

[0009] Optionally, in the above display device provided by the embodiment of the present disclosure, the display module further comprises: a plurality of anodes, and a flat layer located on a side of the layer where the plurality of anodes are located away from the black matrix;

[0010] The collimating structure includes: a first light-shielding layer having a plurality of first light-transmitting holes, a second light-shielding layer having a plurality of second light-transmitting holes, and a third light-shielding layer having a plurality of third light-transmitting holes; wherein the first light-shielding layer is located on a side of the fingerprint recognition module facing the display module, the second light-shielding layer is reused as the flat layer, and the third light-shielding layer is reused as the black matrix.

[0011] Optionally, in the above display device provided by the embodiment of the present disclosure, the display module further comprises: a plurality of anodes, and a pixel defining layer located at a layer where the plurality of anodes are located and facing a side of the black matrix;

[0012] The collimating structure includes: a first light-shielding layer having a plurality of first light-transmitting holes, a second light-shielding layer having a plurality of second light-transmitting holes, and a third light-shielding layer having a plurality of third light-transmitting holes; wherein the first light-shielding layer is located on a side of the fingerprint recognition module facing the display module, the second light-shielding layer is reused as the pixel defining layer, and the third light-shielding layer is reused as the black matrix.

[0013] Optionally, in the above display device provided in the embodiment of the present disclosure, the display module further comprises: a plurality of anodes, a flat layer located on a side of the layer where the plurality of anodes are located away from the black matrix, and an encapsulation layer located between the plurality of anodes and the black matrix;

[0014] The collimating structure includes: a first light-shielding layer having a plurality of first light-transmitting holes, a second light-shielding layer having a plurality of second light-transmitting holes, and a third light-shielding layer having a plurality of third light-transmitting holes; wherein the first light-shielding layer is reused as the flat layer, the second light-shielding layer is located on a side of the encapsulation layer facing the black matrix, and the third light-shielding layer is reused as the black matrix.

[0015] Optionally, in the above display device provided by the embodiment of the present disclosure, the display module further comprises: a plurality of anodes, a pixel defining layer located at a layer where the plurality of anodes are located and facing the black matrix, and an encapsulation layer located between the pixel defining layer and the black matrix;

[0016] The collimating structure includes: a first light-shielding layer having a plurality of first light-transmitting holes, a second light-shielding layer having a plurality of second light-transmitting holes, and a third light-shielding layer having a plurality of third light-transmitting holes; wherein the first light-shielding layer is reused as the pixel defining layer, the second light-shielding layer is located on a side of the encapsulation layer facing the black matrix, and the third light-shielding layer is reused as the black matrix.

[0017] Optionally, in the above display device provided by the embodiment of the present disclosure, the display module further comprises: a plurality of anodes, a flat layer located on a side of the layer where the plurality of anodes are located away from the black matrix, and a pixel defining layer located on a side of the layer where the plurality of anodes are located facing the black matrix;

[0018] The collimating structure includes: a first light-shielding layer having a plurality of first light-transmitting holes, a second light-shielding layer having a plurality of second light-transmitting holes, and a third light-shielding layer having a plurality of third light-transmitting holes; wherein, the first light-shielding layer is multiplexed as the planarization layer, the second light-shielding layer is multiplexed as the pixel defining layer, and the third light-shielding layer is multiplexed as the black matrix.

[0019] Optionally, in the above display device provided by the embodiments of the present disclosure, the centers of the corresponding first light-transmitting holes, second light-transmitting holes, and third light-transmitting holes coincide in the plane of the display module.

[0020] Optionally, in the above display device provided by the embodiments of the present disclosure, the distance between the centers of any two adjacent first light-transmitting holes is the same.

[0021] Optionally, in the above display device provided by the embodiments of the present disclosure, the aperture of the first light-transmitting hole is equal to the aperture of the third light-transmitting hole.

[0022] Optionally, in the above display device provided by the embodiments of the present disclosure, the aperture d of the first light-transmitting hole 1 and the aperture d of the second light-transmitting hole 2 satisfy the following relationship: d 2 / d 1 = h 1 / (h 1 + h 2 ), where the h 1 is the distance between the second light-shielding layer and the third light-shielding layer, and the h 2 is the distance between the first light-shielding layer and the second light-shielding layer.

[0023] Optionally, in the above display device provided by the embodiments of the present disclosure, the distance P between the centers of any two adjacent first light-transmitting holes, the aperture D of the first opening, the d 1 , the d 2 , the h 1 , the h 2 satisfy the following relationship: (P - D - d 1 ) / (2d 1 ) ≥ (h 1 / h 2 ) ≥ (P + D + 3d 1 + d 2 ) / (P - d 1 + d 2 ).

[0024] Optionally, in the above display device provided by the embodiments of the present disclosure, the value range of P is 1 μm - 80 μm, the value range of D is 10 μm - 40 μm, and the value range of d 1 is 4 μm - 15 μm, and the value range of d 2 is 2 μm - 10 μm, the value range of h 1 is 1 μm - 30 μm, and the value range of h 2 is 2 μm - 100 μm.

[0025] Optionally, in the above display device provided by the embodiments of the present disclosure, the collimating light-receiving angle θ determined by the first light-shielding layer and the third light-shielding layer satisfies the following relationship: tanθ = d 1 / (h 1 + h 2 ).

[0026] The beneficial effects of the present disclosure are as follows:

[0027] The display device provided by the embodiments of the present disclosure includes: a display module having a plurality of color filters and a black matrix, wherein the black matrix has a plurality of first openings and a plurality of second openings, and a plurality of color filters are correspondingly disposed in the plurality of first openings; a fingerprint recognition module located on the opposite side of the display surface of the display module; the fingerprint recognition module includes a plurality of fingerprint recognition devices; the orthographic projection of each fingerprint recognition device on the plane where the display module is located at least completely covers the orthographic projection of one second opening and does not overlap with the orthographic projections of the plurality of first openings; a collimating structure located on the light-incident side of the fingerprint recognition module, the collimating structure includes at least two light-shielding layers, each light-shielding layer has a plurality of light-transmitting holes, and the light-transmitting holes in each light-shielding layer correspond to each other and at least partially overlap in the orthographic projection on the plane where the display module is located; one of the light-shielding layers is multiplexed with the black matrix. During fingerprint recognition, when a finger touches the display surface of the display module, the corresponding light-transmitting holes of each light-shielding layer can screen out light at a small angle in a nearly collimated manner and make it reach the fingerprint recognition device below. The fingerprint recognition device can detect the intensity of the light taken out. Since the energies of the downward diffused light from the valleys and ridges are different, the light intensities detected by the plurality of fingerprint recognition devices are different, and thus fingerprint information is obtained to achieve large-area fingerprint recognition. And one of the light-shielding layers is multiplexed with the black matrix, which can save the manufacturing process of one light-shielding layer, simplify the preparation process flow, reduce the production cost, and improve the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of a display device provided by an embodiment of the present disclosure;

[0029] Figure 2 is a schematic cross-sectional structure diagram along the Figure 1 I-II line in

[0030] Figure 3 For Figure 1 Figure 3 The correspondence diagram of the light-transmitting holes of the collimation structure and the fingerprint recognition device;

[0031] Figure 4 Figure 3 A schematic structural diagram of a display device provided by an embodiment of the present disclosure;

[0032] Figure 5 Along Figure 4 Figure 3 The schematic cross-sectional structure diagram along line III-IV in Figure 3 ;

[0033] Figure 6 For Figure 4 Figure 3 The correspondence diagram of the light-transmitting holes of the collimation structure and the fingerprint recognition device;

[0034] Figure 7 Figure 3 A schematic structural diagram of a fingerprint recognition area in a fingerprint recognition module provided by an embodiment of the present disclosure;

[0035] Figure 8 Along Figure 1 Figure 3 Another schematic cross-sectional structure diagram along line I-II in Figure 3 ;

[0036] Figure 9 Along Figure 1 Figure 3 Another schematic cross-sectional structure diagram along line I-II in Figure 3 ;

[0037] Figure 10 Along Figure 1 Figure 3 Another schematic cross-sectional structure diagram along line I-II in Figure 3 ;

[0038] Figure 11 Along Figure 1 Figure 3 Another schematic cross-sectional structure diagram along line I-II in Figure 3 ;

[0039] Figure 12 Figure 3 A schematic structural diagram of the third light-shielding layer provided by an embodiment of the present disclosure;

[0040] Figure 13 Figure 3 A schematic structural diagram of the first light-shielding layer and the second light-shielding layer provided by an embodiment of the present disclosure;

[0041] Figure 14 Figure 3 The schematic diagram of fingerprint imaging and anti-crosstalk design principle provided by an embodiment of the present disclosure;

[0042] Figure 15 Figure 3 The optical property simulation evaluation diagram provided by an embodiment of the present disclosure;

[0043] Figure 16 Figure 3 The fingerprint imaging simulation evaluation diagram provided by an embodiment of the present disclosure. Specific embodiments

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. It should be noted that the sizes and shapes of the various figures in the drawings do not reflect the actual proportions, and the purpose is only to schematically illustrate the content of the present disclosure. Also, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts belong to the scope of protection of the present disclosure.

[0045] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the present disclosure pertains. The terms "first", "second", and similar terms used in the specification and claims of the present disclosure do not denote any order, quantity, or importance, but are only used to distinguish different components. The terms "including" or "comprising" and the like mean that the elements or items appearing before the term cover the elements or items listed after the term and their equivalents, without excluding other elements or items. The terms "inside", "outside", "above", "below", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0046] In the related art, a display device with a fingerprint recognition function includes a display module and a fingerprint recognition module bonded by an optical adhesive; wherein, the display module includes a substrate, a pixel driving circuit, a light-emitting device, a packaging layer, a black matrix, a color filter, a polarizer, and a protection cover plate from bottom to top. In specific implementation, after the light emitted by the light-emitting device is reflected by a finger, it sequentially passes through the display module and the optical adhesive and irradiates the fingerprint recognition module to achieve fingerprint recognition. However, with the thinning of the display module, the area of the fingerprint image obtained by the above fingerprint recognition solution becomes smaller, which not only increases the time for large-area fingerprint stitching, but also the edge part of the fingerprint is extremely vulnerable to strong light interference, resulting in blurred images and poor stitching effects. Therefore, reviewing and designing a solution for large-area fingerprint recognition is the future development trend.

[0047] In view of this, an organic light-emitting display panel provided by an embodiment of the present disclosure, as Figures 1 to 7 shown, includes:

[0048] A display module 1, the display module 1 having a plurality of color filters 101 and a black matrix 102; wherein, the black matrix 102 has a plurality of first openings and a plurality of second openings, and the plurality of color filters 101 are correspondingly disposed in the plurality of first openings one by one;

[0049] The fingerprint recognition module 2 is located on the opposite side of the display surface of the display module 1; the fingerprint recognition module 2 includes a plurality of fingerprint recognition devices 201; the orthographic projection of each fingerprint recognition device 201 on the plane where the display module 1 is located at least completely covers the orthographic projection of one second opening and does not overlap with the orthographic projections of a plurality of first openings;

[0050] The collimation structure 3 is located on the light incident side of the fingerprint recognition module 2. The collimation structure 3 includes at least two light-shielding layers (for example, including a first light-shielding layer 301, a second light-shielding layer 302, and a third light-shielding layer 303). Each light-shielding layer has a plurality of light-transmitting holes. The light-transmitting holes in each light-shielding layer correspond one by one and at least partially overlap in the orthographic projection on the plane where the display module 1 is located; one of the light-shielding layers (for example, the third light-shielding layer 303) is multiplexed with the black matrix 102.

[0051] In the above display device provided by the embodiments of the present disclosure, during fingerprint recognition, when the finger F touches the display surface of the display module 1, the corresponding light-transmitting holes of each light-shielding layer (for example, the first light-shielding layer 301, the second light-shielding layer 302, and the third light-shielding layer 303) can screen out the light at a small angle and nearly collimate it, so that it reaches the lower fingerprint recognition device 201. The fingerprint recognition device 201 can detect the intensity of the extracted light. Due to the different energies of the downward diffuse reflection light of the valleys and ridges, the light intensities detected by the plurality of fingerprint recognition devices 201 are different, and thus the fingerprint information is obtained to achieve large-area fingerprint recognition. And one of the light-shielding layers (for example, the third light-shielding layer 303) is multiplexed with the black matrix 102, which can save the manufacturing process of one light-shielding layer, simplify the preparation process flow, reduce the production cost, and improve the production efficiency.

[0052] It should be noted that in the collimation structure 3 provided by the embodiments of the present disclosure, the number of light-transmitting holes in each light-shielding layer is the same and the positions are the same, forming a one-to-one correspondence relationship. During manufacturing, the orthographic projections of the light-transmitting holes at the same position of each light-shielding layer on the display module 1 overlap as completely as possible. However, due to the alignment error of the actual manufacturing process, there will be a certain offset between the light-transmitting holes at the same position of each light-shielding layer and it cannot be guaranteed that they completely overlap, that is, there may be a situation of partial overlap.

[0053] The regions where the light-transmitting holes of each light-shielding layer completely overlap in the orthographic projection on the display module 1 at the same position form a nested hole structure, which serves to collimate the light incident at various angles to this position, enabling light at an angle within a certain range (small angle) with respect to the normal line perpendicular to the surface of the collimation structure 3 to pass through this nested hole structure, and blocking light beyond this range of angles (large angles). Specifically, the light-receiving angle θ can be defined as the difference between the minimum angle and the maximum angle of the light. And when there are more than two light-shielding layers in the present disclosure, the top light-shielding layer and the bottom light-shielding layer can be used to define the light-receiving angle θ of the collimation structure 3, and the intermediate light-shielding layer can be used to block the light crosstalk between adjacent through-holes, improving the accuracy of the recognized fingerprint information.

[0054] In addition, each fingerprint recognition device 201 can correspond to at least one nested hole structure, for example, corresponding to several or even hundreds of nested hole structures. Specifically, Figures 1 to 3 shows a case where one fingerprint recognition device 201 corresponds to one nested hole structure, Figures 5 to 6 shows a case where one fingerprint recognition device 201 corresponds to three nested hole structures. Optionally, the shape of the light-transmitting hole can be circular or square, which is not limited herein. In addition, the above display device provided by the embodiments of the present disclosure is not limited to the structure of two or three light-shielding layers, and the number of light-shielding layers can also be increased, such as four light-shielding layers or more light-shielding layers, which will not be elaborated herein.

[0055] Optionally, in the above display device provided by the embodiments of the present disclosure, the collimation structure 3 can have the following five possible implementation manners:

[0056] The first possible implementation manner: As Figure 2 and Figure 5 shown, the display module 1 may further include: a plurality of anodes 103, and a planarization layer 104 located on the side of the layer where the plurality of anodes 103 are located and facing away from the black matrix 102;

[0057] The collimation structure 3 may include: a first light-shielding layer 301 having a plurality of first light-transmitting holes, a second light-shielding layer 302 having a plurality of second light-transmitting holes, and a third light-shielding layer 303 having a plurality of third light-transmitting holes; wherein, the first light-shielding layer 301 may be located on the side of the fingerprint recognition module 2 facing the display module 1, the second light-shielding layer 302 may be reused as the planarization layer 104, and the third light-shielding layer 303 may be reused as the black matrix 102.

[0058] When the first light shielding layer 301 is located on the side of the fingerprint recognition module 2 facing the display module 1, the first light shielding layer 301 can be manufactured thereon after the fingerprint recognition module 2 is manufactured, so that there is no need to change the manufacturing process of the existing fingerprint recognition module 2, and the compatibility is good. In addition, the second light shielding layer 302 is reused as the flat layer 104, which not only reduces the overall thickness of the display device, but also simplifies the manufacturing process and improves production efficiency.

[0059] The second possible implementation method is: Figure 8 As shown, the display module 1 may further include: a plurality of anodes 103, and a pixel defining layer 105 located at a layer where the plurality of anodes 103 are located and facing a side of the black matrix 102;

[0060] The collimating structure 3 may include: a first light-shielding layer 301 having multiple first light-transmitting holes, a second light-shielding layer 302 having multiple second light-transmitting holes, and a third light-shielding layer 303 having multiple third light-transmitting holes; wherein the first light-shielding layer 301 is located on the side of the fingerprint recognition module 2 facing the display module 1, the second light-shielding layer can be reused as the pixel defining layer 105, and the third light-shielding layer 303 can be reused as the black matrix 102.

[0061] Based on the same reasons as the first possible implementation method, the second possible implementation method has better compatibility with the fingerprint recognition module preparation process, and can reduce the overall thickness of the display device, simplify the manufacturing process, and improve production efficiency.

[0062] The third possible implementation method is: Figure 9 As shown, the display module 1 may further include: a plurality of anodes 103, a flat layer 104 located on a side of the layer where the plurality of anodes 103 are located away from the black matrix 102, and an encapsulation layer 105 located between the plurality of anodes 103 and the black matrix 102;

[0063] The collimating structure 3 may include: a first light-shielding layer 301 having a plurality of first light-transmitting holes, a second light-shielding layer 302 having a plurality of second light-transmitting holes, and a third light-shielding layer 303 having a plurality of third light-transmitting holes; wherein the first light-shielding layer 301 may be reused as the flat layer 104, the second light-shielding layer 302 may be located on the side of the encapsulation layer 106 facing the black matrix 102, and the third light-shielding layer 303 may be reused as the black matrix 102.

[0064] Generally, the encapsulation layer 106 may include a first inorganic layer, an organic layer and a second inorganic layer stacked together, wherein the second inorganic layer is closest to the film layer of the black matrix 102. In the present disclosure, the second shading layer 302 is specifically located on the side of the second inorganic layer away from the organic layer.

[0065] The fourth possible implementation is Figure 10As shown, the display module 1 may further include: a plurality of anodes 103, a pixel defining layer 105 located at a layer where the plurality of anodes 103 are located and facing the black matrix 102, and an encapsulation layer 106 located between the pixel defining layer 105 and the black matrix 102;

[0066] The collimating structure 3 may include: a first light-shielding layer 301 having a plurality of first light-transmitting holes, a second light-shielding layer 302 having a plurality of second light-transmitting holes, and a third light-shielding layer 303 having a plurality of third light-transmitting holes; wherein the first light-shielding layer 301 may be reused as a pixel defining layer 105, the second light-shielding layer 302 may be located on a side of the encapsulation layer 106 facing the black matrix 102, and the third light-shielding layer 303 may be reused as the black matrix 102.

[0067] The sixth possible implementation method is: Figure 11 As shown, the display module 1 may further include: a plurality of anodes 103, a flat layer 104 located on a side of the layer where the plurality of anodes 103 are located away from the black matrix 102, and a pixel defining layer 105 located on a side of the layer where the plurality of anodes 103 are located facing the black matrix 102;

[0068] The collimating structure 3 may include: a first light-shielding layer 301 having a plurality of first light-transmitting holes, a second light-shielding layer 302 having a plurality of second light-transmitting holes, and a third light-shielding layer 303 having a plurality of third light-transmitting holes; wherein the first light-shielding layer 301 may be reused as a flat layer 104, the second light-shielding layer 302 may be reused as a pixel defining layer 105, and the third light-shielding layer 303 may be reused as a black matrix 102.

[0069] In the third to fifth possible implementations mentioned above, each shading layer of the collimation structure 3 is integrated inside the display module 1, avoiding the fitting and alignment between different shading layers, thereby improving the possible adverse effects of the fitting and alignment accuracy on the alignment effect and improving the accuracy of fingerprint recognition.

[0070] Optionally, in the above-mentioned display device provided by the embodiment of the present disclosure, in order to improve the collimation effect, the centers of the orthographic projections of the one-to-one first light-transmitting holes, the second light-transmitting holes, and the third light-transmitting holes on the plane where the display module 1 is located coincide with each other, and the distance P between the centers of any two adjacent first light-transmitting holes is the same (e.g. Figure 12 and Figure 13 According to the process manufacturing capability, the value range of P can be 20μm-80μm.

[0071] Optionally, in the display device provided in the embodiment of the present disclosure, the aperture d of the first light-transmitting hole is 1 Can be equal to the aperture d of the third light-transmitting hole 3 , to ensure the required collimation angle θ.

[0072] Specifically,Figure 14 As shown, the distance between the third light-shielding layer 303 and the display surface is H, and its value range can be 100μm - 1000μm, such as 100μm, 200μm, 300μm, 400μm, 500μm, 600μm, 700μm, 800μm, 900μm, 1000μm, etc.; the distance between the second light-shielding layer 302 and the third light-shielding layer 303 is h 1 , and the distance between the second light-shielding layer 302 and the first light-shielding layer 301 is h 2 . According to the process manufacturing ability and to ensure the thin and light type of the display device, the value range of h 1 can be 1μm - 30μm, such as 1μm, 5μm, 10μm, 15μm, 20μm, 25μm, 30μm, etc., and the value range of h 2 can be 2μm - 100μm, such as 1μm, 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, etc., then the collimation light-receiving angle θ satisfies the following relationship: tanθ = d 1 / (h 1 + h 2 ).

[0073] . According to the process manufacturing ability and to ensure the thin and light type of the module, the value range of d 1 can be 4μm - 15μm, such as 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, etc. In specific implementation, the value range of θ is selected to be about 10° - 30° for fingerprint reflected light to form an image.

[0074] In addition, to achieve the collimation function, the interference of stray light must be avoided, such as the interference of stray light 1 and stray light 2. This requires reasonable control of the sizes of d 1 , d 2 , d 3 , P, h 1 , h 2 . The following details how to avoid the interference of stray light:

[0075] Specifically, the aperture d 2 of the second light-transmitting hole can be changed through optical design so that stray light 1 does not reach the fingerprint recognition device 201, that is, points A, B, and C marked in the figure are in a straight line. Among them, point A is the left boundary point of the first opening of the green light color resist G - CF, point B is the right boundary point of the second light-transmitting hole, and C is the left boundary point of the first light-transmitting hole. At this time, the following relationship must be satisfied for each parameter:

[0076] d 1 = d 3 (1)

[0077] d 2 / d 3 = h 1 / (h 1 + h 2 )(2)

[0078] (P - D - d 1 ) / (2d 3 ) ≥ h 1 / h 2 (3)

[0079] Among them, D is the size of the aperture of the first opening contained in the black matrix 102, and the value range can be 10μm - 40μm, such as 10μm, 20μm, 30μm, 40μm, etc.

[0080] Furthermore, in order to prevent the light crosstalk influence of adjacent third light-transmitting holes (that is, to ensure Figure 14 the stray light 2 does not reach point C), the following relational expression must also be satisfied:

[0081] (P - d 3 + d 2 ) / h 2 ≥ (P + D + 3d 1 + d 2 ) / h 1 (4)

[0082] By combining formulas (1) - (4), the following relational expression can be obtained:

[0083] (h 1 / h 2 ) ≥ (P + D + 3d 1 + d 2 ) / (P - d 1 + d 2 ) (5)

[0084] (P - D - d 1 ) / (2d 1 ) ≥ (h 1 / h 2 ) (6)

[0085] Therefore, P, D, d 1 , d 2 , h 1 , h 2 satisfy the following relationship:

[0086] (P - D - d 1 ) / (2d 1 ) ≥ (h 1 / h 2 ) ≥ (P + D + 3d1 +d 2 ) / (P - d 1 +d 2 ) (7).

[0087] From Figure 15 the optical simulation diagram shown, it can be seen that the three - layer light - transmitting holes avoid the interference of stray light and only allow the light with the degree of the collimating light - collecting angle θ within the range of ±9° to pass through. Figure 16 It is a fingerprint imaging simulation evaluation diagram. It can be seen that the three - layer light - transmitting holes can screen out the light with a small angle nearly collimated, making it reach the fingerprint recognition device below. Each beam of light screened out can accurately correspond to the valleys and ridges of the fingerprint one by one, without the interference of other stray light, and accurate recognition can be achieved.

[0088] In addition, in the above - mentioned display device provided by the embodiments of the present disclosure, as Figure 2 shown, the display module 1 generally further includes: a first substrate 107, a first driving circuit layer 108, a spacer layer 109, a light - emitting layer 110, a cathode 111, a buffer layer 112, a first protective layer 113, a touch layer 114, and a cover plate 115. As Figure 2 and Figure 5 shown, the fingerprint recognition module 2 further includes: a second substrate 202, a second driving circuit layer 203, a second protective layer 204, a gate insulating layer 205, a passivation layer 206, a side - wall protective layer 207, a resin layer 208, an insulating layer 209, a bias line 210, and a third protective layer 211; the fingerprint recognition device 201 includes a first electrode 2011, a photoelectric conversion layer 2012, and a second electrode 2013 which are stacked. Optionally, the display module 1 and the fingerprint recognition module 2 are fixed by an optical adhesive 4.

[0089] The display device provided by the embodiments of the present disclosure includes: a display module having a plurality of color filters and a black matrix, wherein the black matrix has a plurality of first openings and a plurality of second openings, and the plurality of color filters are correspondingly disposed in the plurality of first openings; a fingerprint recognition module located on the opposite side of the display surface of the display module; the fingerprint recognition module includes a plurality of fingerprint recognition devices; the orthographic projection of each fingerprint recognition device on the plane where the display module is located at least completely covers the orthographic projection of one second opening and does not overlap with the orthographic projections of the plurality of first openings; a collimation structure located on the light incident side of the fingerprint recognition module, the collimation structure includes at least two light-shielding layers, each light-shielding layer has a plurality of light-transmitting holes, and the light-transmitting holes in each light-shielding layer correspond to each other and at least partially overlap in the orthographic projection on the plane where the display module is located; one of the light-shielding layers is multiplexed with the black matrix. During fingerprint recognition, when a finger touches the display surface of the display module, the corresponding light-transmitting holes of each light-shielding layer can screen out light at a small angle in a nearly collimated manner and make it reach the fingerprint recognition device below. The fingerprint recognition device can detect the intensity of the light taken out. Since the energies of the downward diffuse reflected lights from the valleys and ridges are different, the light intensities detected by the plurality of fingerprint recognition devices are different, and thus fingerprint information is obtained to achieve large-area fingerprint recognition. And one of the light-shielding layers is multiplexed with the black matrix, which can save the manufacturing process of one light-shielding layer, simplify the preparation process flow, reduce the production cost, and improve the production efficiency.

[0090] Obviously, those skilled in the art can make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalent technologies, the present disclosure is also intended to include these changes and modifications.

Claims

1. A display device, It is characterized in that include: A display module, comprising: a plurality of color resists and a black matrix; wherein the black matrix has a plurality of first openings and a plurality of second openings, the plurality of color resists are arranged in the plurality of first openings in a one-to-one correspondence, a plurality of anodes, and a pixel defining layer located at a layer where the plurality of anodes are located and facing a side of the black matrix; A fingerprint recognition module is located on the opposite side of the display surface of the display module; the fingerprint recognition module includes a plurality of fingerprint recognition devices; the orthographic projection of each of the fingerprint recognition devices on the plane where the display module is located completely covers at least one orthographic projection of the second opening and does not overlap with the orthographic projections of the plurality of first openings; A collimating structure is located on the light incident side of the fingerprint recognition module, and the collimating structure includes at least two light-shielding layers, each of which has a plurality of light-transmitting holes, and the light-transmitting holes in each of the light-shielding layers correspond to each other one by one and their orthographic projections on the plane where the display module is located at least partially overlap; one of the light-shielding layers is reused with the black matrix, and the other light-shielding layer is reused with the pixel defining layer.

2. The display device according to claim 1, It is characterized in that The display module also includes: the collimating structure includes: a first light-shielding layer having a plurality of first light-transmitting holes, a second light-shielding layer having a plurality of second light-transmitting holes, and a third light-shielding layer having a plurality of third light-transmitting holes; wherein the first light-shielding layer is located on the side of the fingerprint recognition module facing the display module, the second light-shielding layer is reused as the pixel defining layer, and the third light-shielding layer is reused as the black matrix.

3. The display device according to claim 1, It is characterized in that The display module further includes: an encapsulation layer located between the pixel definition layer and the black matrix; The collimating structure includes: a first light-shielding layer having a plurality of first light-transmitting holes, a second light-shielding layer having a plurality of second light-transmitting holes, and a third light-shielding layer having a plurality of third light-transmitting holes; wherein the first light-shielding layer is reused as the pixel defining layer, the second light-shielding layer is located on a side of the encapsulation layer facing the black matrix, and the third light-shielding layer is reused as the black matrix.

4. The display device according to claim 1, It is characterized in that The display module further comprises: a flat layer located on a side of the layer where the plurality of anodes are located away from the black matrix; The collimating structure includes: a first light-shielding layer having a plurality of first light-transmitting holes, a second light-shielding layer having a plurality of second light-transmitting holes, and a third light-shielding layer having a plurality of third light-transmitting holes; wherein the first light-shielding layer is multiplexed as the flat layer, the second light-shielding layer is multiplexed as the pixel defining layer, and the third light-shielding layer is multiplexed as the black matrix.

5. The display device according to any one of claims 2 to 4, It is characterized in that Centers of the orthographic projections of the first light-transmitting holes, the second light-transmitting holes, and the third light-transmitting holes, which correspond to each other one by one, on the plane where the display module is located coincide with each other.

6. The display device according to claim 5, It is characterized in that The distance between the centers of any two adjacent first light-transmitting holes is the same.

7. The display device according to claim 6, It is characterized in that The aperture diameter of the first light-transmitting hole is equal to the aperture diameter of the third light-transmitting hole.

8. The display device according to claim 7, wherein, The aperture diameter d of the first light-transmitting hole 1 and the aperture diameter d of the second light-transmitting hole 2 satisfy the following relationship: d 2 / d 1 = h 1 / (h 1 + h 2 ), where the h 1 is the distance between the second light-shielding layer and the third light-shielding layer, and the h 2 is the distance between the first light-shielding layer and the second light-shielding layer.

9. The display device according to claim 8, wherein, The distance P between the centers of any two adjacent first light-transmitting holes, the aperture D of the first opening, the d 1 the d 2 the h 1 the h 2 satisfy the following relationship: (P - D - d 1 ) / (2d 1 ) ≥ (h 1 / h 2 ) ≥ (P + D + 3d 1 + d 2 ) / (P - d 1 + d 2 ).

10. The display device according to claim 9, wherein, The value range of P is 1 μm - 80 μm, the value range of D is 10 μm - 40 μm, and the value range of d 1 is 4 μm - 15 μm, and the value range of d 2 is 2 μm - 10 μm, and the value range of h 1 is 1 μm - 30 μm, and the value range of h 2 is 2 μm - 100 μm.

11. The display device according to claim 8, wherein, The collimated light-receiving angle θ determined by the first light-shielding layer and the third light-shielding layer satisfies the following relationship: tanθ = d 1 / (h 1 +h 2 ).

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