Display substrate and display device

Abstract

The display substrate and the display device provided by the present disclosure comprise a substrate, a plurality of light emitting devices and a plurality of light sensitive devices arranged in an array on the substrate, the orthogonal projection of each light sensitive device on the substrate and the orthogonal projection of the gap of each light emitting device overlap with each other, the light sensitive device comprises a photoelectric conversion layer, the photoelectric conversion layer comprises at least one photoelectric conversion part; a black matrix is located on the side of the layer of the light emitting device away from the substrate; the orthogonal projection of the black matrix on the substrate and the orthogonal projection of the gap of each light emitting device overlap with each other, the black matrix has a plurality of openings, the orthogonal projection of the opening on the substrate and the orthogonal projection of the photoelectric conversion part overlap with each other; the collimation light collection angle θ in any direction determined by the opening and the photoelectric conversion part satisfies the following relationship: wherein P is the ridge size of the fingerprint, H is the distance from the contact surface of the fingerprint and the display substrate to the end surface of the opening away from the substrate.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a display substrate and a display device. Background Technology

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

[0003] This disclosure provides a display substrate and a display device, the specific solutions of which are as follows:

[0004] On one hand, embodiments of this disclosure provide a display substrate, including:

[0005] Substrate;

[0006] Multiple light-emitting devices are arranged in an array on the substrate.

[0007] Multiple photosensitive devices are arranged in an array on the substrate; the orthographic projection of each photosensitive device on the substrate and the orthographic projection of the gap between each light-emitting device on the substrate overlap each other; each photosensitive device includes a photoelectric conversion layer, and the photoelectric conversion layer includes at least one photoelectric conversion part.

[0008] A black matrix is ​​located on the side of the layer containing the light-emitting devices that faces away from the substrate. The orthographic projection of the black matrix onto the substrate overlaps with the orthographic projection of the gaps between the light-emitting devices onto the substrate. The black matrix has multiple openings, and the orthographic projections of these openings onto the substrate overlap with the orthographic projections of the photoelectric conversion unit onto the substrate. The collimation angle θ in any direction determined by the openings and the photoelectric conversion unit satisfies the following relationship:

[0009]

[0010] Where P is the ridge size of the fingerprint, and H is the distance from the contact surface between the fingerprint and the display substrate to the end face of the opening away from the substrate.

[0011] In some embodiments, in the display substrate provided in the present disclosure, the opening corresponds one-to-one with the photoelectric conversion unit, the orthographic projection of the photoelectric conversion unit on the substrate completely covers the orthographic projection of the corresponding opening on the substrate, and the orthographic projection of the center of the opening on the substrate substantially coincides with the orthographic projection of the center of the corresponding photoelectric conversion unit on the substrate.

[0012] In some embodiments, in the display substrate provided in the present disclosure, the ratio of the size of the opening to the size of the photoelectric conversion part in the same direction is greater than or equal to 0.8 and less than or equal to 1.

[0013] In some embodiments, in the display substrate provided in the present disclosure, the orthographic projection shape of the opening on the substrate and the orthographic projection shape of the photoelectric conversion part on the substrate are both rectangular.

[0014] The collimation angle θ1 along the long side of the rectangle, the collimation angle θ2 along the wide side, and the collimation angle θ3 along the diagonal, determined by the opening and the photoelectric conversion unit, satisfy the following relationship:

[0015]

[0016]

[0017]

[0018] Where h is the distance between the surface of the photoelectric conversion section away from the substrate and the end face of the opening away from the substrate, and d is the distance between the two surfaces. L d is the length of the photoelectric conversion unit. S D is the width of the photoelectric conversion unit. L D is the length of the opening. S The width of the opening.

[0019] In some embodiments, in the display substrate provided in the present disclosure, 1≤d L / d S ≤1.3, 1≤D L / D S ≤1.3.

[0020] In some embodiments, in the display substrate provided in the present disclosure, 200μm≤P≤500μm, 4μm≤h≤22μm, and 7μm≤d L ≤14μm, 7≤d S ≤18.2μm, 5.6μm≤D L ≤14μm, 5.6μm≤D S ≤18.2μm.

[0021] In some embodiments, in the display substrate provided in the present disclosure, the ratio of the size of the opening to the size of the photoelectric conversion section in the same direction is greater than 0 and less than 0.8.

[0022] In some embodiments, in the display substrate provided in the present disclosure, the orthographic projection shape of the opening on the substrate and the orthographic projection shape of the photoelectric conversion part on the substrate are both polygonal or circular.

[0023] In some embodiments, in the display substrate provided in the present disclosure, the photoelectric conversion layer includes a plurality of photoelectric conversion units, and each photoelectric conversion unit has the same orthographic projection shape and the same area on the substrate.

[0024] In some embodiments, in the display substrate provided in the present disclosure, each photoelectric conversion unit in the same photosensitive device is rotationally symmetrical about the center of the photosensitive device.

[0025] In some embodiments, in the display substrate provided in the present disclosure, in the same photosensitive device, the photoelectric conversion layer includes three photoelectric conversion units, and the center line connecting the photoelectric conversion units forms an equilateral triangle.

[0026] In some embodiments, in the display substrate provided in the present disclosure, four photosensitive devices in every two adjacent rows and two columns constitute a repeating unit, and each photoelectric conversion part in the repeating unit is rotationally symmetrical about the center of the repeating unit.

[0027] In some embodiments, in the display substrate provided in the present disclosure, the photosensitive device includes a first electrode; in the same photosensitive device, the orthogonal projection of the photoelectric conversion unit on the substrate is located within the orthogonal projection of the first electrode on the substrate.

[0028] In some embodiments, the display substrate provided in this disclosure further includes a filter layer located on the side of the photosensitive device away from the substrate, wherein the orthographic projection of the filter layer on the substrate overlaps with the orthographic projection of the photoelectric conversion unit on the substrate, and the filter layer is configured to block ambient light above 600nm.

[0029] In some embodiments, in the display substrate provided in the present disclosure, the filter layer fills the opening, and the orthographic projection of the filter layer on the substrate generally coincides with the orthographic projection of the opening on the substrate.

[0030] In some embodiments, the display substrate provided in this disclosure further includes a blue light resist located on the side of the black matrix away from the substrate, and the filter layer is disposed in the same layer as the blue light resist.

[0031] In some embodiments, the display substrate provided in this disclosure further includes a pixel delimiting layer located between the bottom electrode layer of the light-emitting device and the light-emitting functional layer of the light-emitting device, wherein the pixel delimiting layer is reused as the filter layer.

[0032] In some embodiments, the display substrate provided in this disclosure further includes a pixel delimiting layer located between the bottom electrode layer of the light-emitting device and the light-emitting functional layer of the light-emitting device;

[0033] The filter layer is located between the pixel defining layer and the light-emitting functional layer of the light-emitting device, and the orthographic projection of the filter layer on the substrate is located within the orthographic projection of the pixel defining layer on the substrate.

[0034] In some embodiments, the display substrate provided in this disclosure further includes a planarization layer located between the photosensitive device layer and the light-emitting device layer, wherein the planarization layer is reused as the filter layer.

[0035] On the other hand, this disclosure also provides a display device, including the display substrate provided in the above-described embodiments. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of a display substrate provided in an embodiment of the present disclosure;

[0037] Figure 2 for Figure 1 A schematic diagram of the structure of the black matrix;

[0038] Figure 3 for Figure 1 A schematic diagram of the structure of the mid-pixel delimitation layer;

[0039] Figure 4 for Figure 1 Schematic diagram of the structure of the layer containing the bottom electrode;

[0040] Figure 5 for Figure 1 Schematic diagram of the photoelectric conversion layer;

[0041] Figure 6 This is a schematic diagram of yet another structure of the display substrate provided in an embodiment of this disclosure;

[0042] Figure 7 A schematic diagram of a first opening and a photoelectric conversion unit provided in an embodiment of this disclosure;

[0043] Figure 8 for Figure 7 Schematic diagram of the collimation angle along the middle-long side direction I-I';

[0044] Figure 9 for Figure 7 Schematic diagram of the collimation angle along the middle-wide side direction II-II';

[0045] Figure 10 for Figure 7 Schematic diagram of the collimation angle along the middle diagonal direction III-III';

[0046] Figure 11 This is a partial structural diagram of a black matrix provided in an embodiment of the present disclosure;

[0047] Figure 12 Another structural schematic diagram of the first opening and photoelectric conversion unit provided in an embodiment of this disclosure;

[0048] Figure 13 A schematic diagram of another partial structure of the black matrix provided in this embodiment of the present disclosure;

[0049] Figure 14 Another structural schematic diagram of the first opening and photoelectric conversion unit provided in an embodiment of this disclosure;

[0050] Figure 15 A schematic diagram of another partial structure of the black matrix provided in this embodiment of the present disclosure;

[0051] Figure 16 Another structural schematic diagram of the first opening and photoelectric conversion unit provided in an embodiment of this disclosure;

[0052] Figure 17 This is a schematic diagram of yet another structure of the display substrate provided in an embodiment of this disclosure;

[0053] Figure 18 This is a schematic diagram of yet another structure of the display substrate provided in an embodiment of this disclosure;

[0054] Figure 19 This is a schematic diagram of yet another structure of the display substrate provided in an embodiment of this disclosure;

[0055] Figure 20 A schematic diagram of the spectrum of the filter layer provided in the embodiments of this disclosure;

[0056] Figure 21 This is a schematic diagram of the structure of a photoelectric conversion unit contained in a photosensitive device provided in an embodiment of the present disclosure;

[0057] Figure 22 A schematic diagram of a structure of the region where the four photosensitive devices are located, provided in an embodiment of this disclosure;

[0058] Figure 23 This is yet another structural schematic diagram of the region where the four photosensitive devices are located, as provided in an embodiment of this disclosure.

[0059] Figure 24 This is yet another structural schematic diagram of the region where the four photosensitive devices are located, as provided in an embodiment of this disclosure.

[0060] Figure 25 This is yet another structural schematic diagram of the region where the four photosensitive devices are located, as provided in an embodiment of this disclosure.

[0061] Figure 26 This is yet another structural schematic diagram of the region where the four photosensitive devices are located, as provided in an embodiment of this disclosure.

[0062] Figure 27 This is yet another structural schematic diagram of the region where the four photosensitive devices are located, as provided in an embodiment of this disclosure.

[0063] Figure 28 This is a schematic diagram of the structure of a region where a photosensitive device is located, provided in an embodiment of this disclosure;

[0064] Figure 29 for Figure 28 A schematic diagram of the structure of the first electrode and the photoelectric conversion unit;

[0065] Figure 30 for Figure 28 A schematic diagram of the structure of the layer containing the first transistor. Detailed Implementation

[0066] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. It should be noted that the dimensions and shapes of the figures in the drawings do not reflect actual proportions and are only intended to illustrate the content of this disclosure. Furthermore, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout the drawings.

[0067] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of skill in the art. The terms “first,” “second,” and similar terms used in this disclosure and the claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “inner,” “outer,” “upper,” and “lower” are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0068] In the realm of ultra-thin foldable screens, ultra-thin glass (UTG), as a thinner and stronger type of glass, is not only more resilient than transparent polyimide film (CPI) but also retains many of the inherent advantages of glass. Given the potential market demand for UTG, ultra-thin foldable screens equipped with fingerprint recognition are a future trend in display products.

[0069] In related optical fingerprint recognition products, in order to enable the photosensitive device to receive the largest possible amount of signal, the area of ​​the photoelectric conversion layer PIN in the photosensitive device is usually designed to be as large as possible. However, related technologies only consider that the collimation angle (also known as collimation) of the reflected light of the fingerprint in the horizontal direction meets the fingerprint recognition requirements, while ignoring the problem that different collimation angles in different directions will cause differences in fingerprint images in different directions. Therefore, the fingerprint images recognized in related technologies are not accurate.

[0070] To address the aforementioned technical problems in related technologies, this disclosure provides a display substrate, such as... Figures 1 to 10 As shown, it includes:

[0071] Substrate 101;

[0072] Multiple light-emitting devices 102 are arranged in an array on the substrate 101;

[0073] Multiple photosensitive devices 103 are arranged in an array on a substrate 101. The orthographic projection of each photosensitive device 103 on the substrate 101 overlaps with the orthographic projection of the gap between each light-emitting device 102 (specifically, the gap between the bottom electrodes A contained in each light-emitting device 102) on the substrate 101. Each photosensitive device 103 includes a photoelectric conversion layer PIN. Each photoelectric conversion layer PIN contained in the photosensitive device 103 may include at least one photoelectric conversion part S, which is equivalent to the photoelectric conversion layer PIN constituting a photoelectric conversion part S, or the photoelectric conversion layer PIN being divided into multiple photoelectric conversion parts S. In some embodiments, the orthographic projection of the photoelectric conversion part S on the substrate 101 is located within the orthographic projection of the gap between each bottom electrode A on the substrate 101.

[0074] The black matrix 104 is located on the side of the layer containing the light-emitting device 102 that faces away from the substrate 101. The orthographic projection of the black matrix 104 on the substrate 101 overlaps with the orthographic projection of the gaps between the light-emitting devices 102 (specifically, the gaps between the effective light-emitting functional layers of each light-emitting device 102) on the substrate 101. The black matrix 104 may have multiple first openings K1. The orthographic projection of the first openings K1 on the substrate 101 overlaps with the orthographic projection of the photoelectric conversion unit S on the substrate 101, so that the first openings K1 and the photoelectric conversion unit S form a collimated optical path. The reflected light from the fingerprint shines on the photoelectric conversion unit S through the first openings K1, and the collimated light-receiving angle θ in any direction determined by the first openings K1 and the photoelectric conversion unit S must satisfy the following relationship:

[0075]

[0076] Wherein, P is the ridge size of the fingerprint (i.e., the distance between the centers of two adjacent ridges in the fingerprint, or the distance between the centers of two adjacent valleys in the fingerprint), 200μm≤P≤500μm. In this disclosure, P can be taken as 200μm to meet the recognition of the minimum fingerprint size. H is the distance from the contact surface between the fingerprint and the display substrate to the end face of the first opening K1 away from the substrate 101 (equivalent to the surface of the black matrix 104 away from the substrate 101).

[0077] Since the relationship for the angle α that satisfies the fingerprint recognition requirements is: In the display substrate provided in the embodiments of this disclosure, the collimation angle θ in any direction, determined by the first opening K1 and the photoelectric conversion unit S, satisfies... This relationship ensures that the collimation angle θ in all directions is within the range of α, thereby guaranteeing accurate fingerprint recognition in all directions and effectively improving the accuracy of fingerprint recognition.

[0078] In some embodiments, in the display substrate provided in the present disclosure, the substrate 101 can be a flexible substrate, such as a polyimide (PI) substrate; or, the substrate 101 can also be a rigid substrate, such as a glass substrate.

[0079] Optionally, the photosensitive device 103 may further include a first electrode a located between the photoelectric conversion layer PIN and the substrate 101, and a second electrode (not shown) located on the side of the photoelectric conversion layer PIN away from the substrate 101. In some embodiments, the photoelectric conversion layer PIN (i.e., the photoelectric conversion part S) may include a stacked p-type semiconductor layer, an i-type semiconductor layer (also called an intrinsic semiconductor layer), and an n-type semiconductor layer. The photoelectric conversion layer PIN and the second electrode (not shown) can be formed using a single patterning process. Optionally, to reduce leakage current, the orthographic projection of the second electrode (not shown) on the substrate 101 needs to be slightly smaller than the orthographic projection of the photoelectric conversion layer PIN on the substrate 101. For example, the distance between the boundary of the orthographic projection of the second electrode (not shown) on the substrate 101 and the boundary of the orthographic projection of the photoelectric conversion layer PIN on the substrate 101 can be 0.5 μm to 2 μm.

[0080] In some embodiments, the light-emitting device 102 may include a bottom electrode A, a light-emitting functional layer EL, and a top electrode C stacked together. The light-emitting functional layer EL may include, but is not limited to, a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting material layer, a hole blocking layer, an electron transport layer, and an electron injection layer. The light-emitting functional layer EL located within the pixel opening K of the pixel defining layer 105 is the effective light-emitting functional layer of the light-emitting device 102. The light-emitting device 102 in this disclosure may be a top-emitting type, the bottom electrode A may be a reflective electrode, the top electrode C may be a transparent electrode, and the light-emitting device 102 may include, but is not limited to, a red light-emitting device R, a green light-emitting device G, and a blue light-emitting device B.

[0081] In some embodiments, the orthographic projection of the black matrix 104 onto the substrate 101 may lie within the orthographic projection of the pixel defining layer 105 onto the substrate 101. The black matrix 104 may also have a plurality of second openings K2, and a color resist 106 is disposed within each of the second openings K2. To improve color purity, the orthographic projection of the pixel opening K onto the substrate 101 may lie within the orthographic projection of the second opening K2 onto the substrate 101. The color resist 106 may include, but is not limited to, red, green, and blue color resists, wherein a red light device R is located below the red light resist, a green light device G is located below the green light resist, and a blue light device B is located below the blue light resist.

[0082] In some embodiments, in the display substrate provided in the present disclosure, such as Figure 1 , Figure 2 and Figure 5As shown, the first opening K1 corresponds one-to-one with the photoelectric conversion unit S. To ensure that all the fingerprint reflected light transmitted through the first opening K1 illuminates the photoelectric conversion unit S and improves the fingerprint recognition quality, the orthogonal projection of the photoelectric conversion unit S on the substrate 101 can be configured to completely cover the orthogonal projection of the corresponding first opening K1 on the substrate 101. For example, the orthogonal projection of the photoelectric conversion unit S on the substrate 101 coincides with the orthogonal projection of the corresponding first opening K1 on the substrate 101, or the orthogonal projection of the first opening K1 on the substrate 101 is located within the orthogonal projection of the photoelectric conversion unit S on the substrate 101. Optionally, to improve the center transmittance of the first opening K1, the orthogonal projection of the center of the first opening K1 on the substrate 101 can be configured to approximately coincide with the orthogonal projection of the center of the corresponding photoelectric conversion unit S on the substrate 101, that is, the centers of the two coincide exactly or are within the offset range caused by factors such as manufacturing or measurement.

[0083] In some embodiments, in the display substrate provided in this disclosure, in order to obtain a better collimation effect and improve the signal-to-noise ratio, the ratio of the size of the first opening K1 to the size of the photoelectric conversion part S in the same direction can be greater than or equal to 0.8 and less than or equal to 1, for example, 0.8, 0.9, 1, etc. Optionally, as... Figures 7 to 14 As shown, taking the example where both the orthographic projection shape of the first opening K1 on the substrate 101 and the orthographic projection shape of the photoelectric conversion unit S on the substrate 101 are rectangular, the length D of the first opening K1 along the long side direction I-I' of the rectangle is... L Width d of the photoelectric conversion unit S L The ratio 0.8 ≤ D L / d L ≤1; The width D of the first opening K1 along the width direction II-II' of the rectangle. S Width d of the photoelectric conversion unit S S The ratio 0.8 ≤ D S / d S ≤1; In the diagonal direction III-III' of the rectangle, the ratio of the diagonal D of the first opening K1 to the diagonal d of the photoelectric conversion unit S is 0.8≤D / d≤1. Accordingly, the collimation angle θ1 in the long side direction I-I', the collimation angle θ2 in the wide side direction II-II', and the collimation angle θ3 in the diagonal direction III-III', determined by the first opening K1 and the photoelectric conversion unit S, satisfy the following relationship:

[0084]

[0085]

[0086]

[0087] Where h is the distance between the surface of the photoelectric conversion section S away from the substrate 101 and the end face of the first opening K1 away from the substrate 101, and d is the distance between the two surfaces. L Let d be the length of the photoelectric conversion unit S. S D is the width of the photoelectric conversion unit S. L D is the length of the first opening K1. S The width of the first opening K1.

[0088] Since a square is a rectangle, and considering the relationships between θ1, θ2, and θ3 above, we know that θ2 ≤ θ1 < θ3. Therefore, to ensure that θ1, θ2, and θ3 are all greater than or equal to 0° and less than or equal to 0°... As long as it is guaranteed That's all.

[0089] Since the collimation angle θ1 in the long side direction I-I' and the collimation angle θ2 in the wide side direction II-II' have the greatest impact on fingerprint recognition, in practical design, the collimation angle θ1 in the long side direction I-I' and the collimation angle θ2 in the wide side direction II-II' can be set to be the same or similar. Optionally, in the display substrate provided in the embodiments of this disclosure, 1≤d L / d S ≤1.3, 1≤D L / D S ≤1.3. In some embodiments, 4μm≤h≤22μm, 7μm≤d L ≤14μm, 7≤d S ≤18.2μm, 5.6μm≤D L ≤14μm, 5.6μm≤D S ≤18.2μm.

[0090] The above description only uses the example of the orthographic projection shape of the first opening K1 on the substrate 101 and the orthographic projection shape of the photoelectric conversion unit S on the substrate 101 being rectangular. In some embodiments, the orthographic projection shape of the first opening K1 on the substrate 101 and the orthographic projection shape of the photoelectric conversion unit S on the substrate 101 can both be polygonal or... Figure 15 and Figure 16 The circle shown is not limited here.

[0091] In some embodiments, in the display substrate provided in this disclosure, the ratio of the size of the first opening K1 to the size of the photoelectric conversion unit S in the same direction can be greater than 0 and less than 0.8. Compared to the above-mentioned scheme where the ratio of the size of the first opening K1 to the size of the photoelectric conversion unit S is greater than or equal to 0.8 and less than or equal to 1, when the size of the photoelectric conversion unit S is fixed, the diameter of the first opening K1 is smaller. This ensures that even if the ambient light is bright, the total amount of ambient light passing through the finger and the first opening K1 and illuminating the photosensitive device 103 will not exceed the full-well capacity of the photosensitive device 103, thereby enabling fingerprint recognition using ambient light in bright ambient light conditions. Optionally, when the ambient light is too dim to recognize the fingerprint, display light can be used for fingerprint recognition.

[0092] In the aforementioned scheme where the ratio of the size of the first opening K1 to the size of the photoelectric conversion unit S is greater than or equal to 0.8 and less than or equal to 1, due to the larger first opening K1, in cases of excessively bright ambient light, the total amount of ambient light passing through the finger and the first opening K1 and illuminating the photosensitive device 103 exceeds the full-well capacity of the photosensitive device 103, making fingerprint recognition impossible. Therefore, fingerprint recognition can be performed using display light. Correspondingly, since light rays greater than 600nm in ambient light can pass through the finger, therefore, as... Figure 6 , Figures 17 to 19 As shown, a filter layer 107 can be provided on the side of the photosensitive device 103 away from the substrate 101, such that the orthographic projection of the filter layer 107 on the substrate 101 overlaps with the orthographic projection of the photoelectric conversion unit S on the substrate 101. This allows the filter layer 107 to block ambient light above 600nm, preventing ambient light from affecting fingerprint recognition. Optionally, as... Figure 20 As shown, the overall transmittance of the filter layer 107 for light of 380nm or greater and 600nm or less can be greater than or equal to 12% and less than or equal to 40%, and the overall transmittance of the filter layer 107 for light of 600nm or greater can be less than 0.01%.

[0093] In some embodiments, in the display substrate provided in the present disclosure, such as Figure 17 As shown, the filter layer 107 can fill the first opening K1, and the orthographic projection of the filter layer 107 on the substrate 101 approximately coincides with the orthographic projection of the first opening K1 on the substrate 101, that is, exactly coincides or is within the error range caused by factors such as manufacturing and measurement. In some embodiments, the filter layer 107 filling the first opening K1 can be disposed in the same layer as the blue light resist, and the same mask process can be used to complete the fabrication of the filter layer 107 and the blue light resist, avoiding the need for an additional mask process for the filter layer 107. In some embodiments, to avoid the need for an additional mask process for the filter layer 107, the filter layer 107 can also be reused with an existing film layer in the display substrate, for example, in... Figure 6 The intermediate filter layer 107 is reused with the pixel defining layer 105 that defines the light-emitting device 102. Figure 18 The intermediate filter layer 107 is reused with the first planarization layer 108 located between the layer containing the photosensitive device 103 and the layer containing the light-emitting device 102. Of course, in some embodiments, the filter layer 107 can also be fabricated separately, such as... Figure 19 As shown, a filter layer 107 can be disposed between the pixel defining layer 105 and the light-emitting functional layer EL of the light-emitting device 102, such that the orthographic projection of the filter layer 107 on the substrate 101 lies within the orthographic projection of the pixel defining layer 105 on the substrate 101. When the filter layer 107 is reused with existing film layers in the display substrate or disposed separately, the material of the filter layer 107 can be the same as that of the blue light resist, thereby effectively attenuating ambient light greater than 600nm and less than or equal to 780nm that passes through the finger.

[0094] In some embodiments, when fingerprint recognition is performed using display light, when finger F touches the upper surface of the display substrate, light is emitted by controlling the light-emitting device 102 to illuminate the surface light source. The light emitted from a light-emitting functional layer EL travels upwards through the various film layers between the light-emitting functional layer EL and the upper surface of the display substrate to reach the fingerprint interface (i.e., the contact surface between the finger and the upper surface of the display substrate). The reflected light is then reflected at the fingerprint interface, and the reflected light travels through the various film layers between the photoelectric conversion layer PIN and the upper surface of the display substrate to reach the photoelectric conversion layer PIN. The photoelectric conversion layer PIN converts the reflected light from the fingerprint into an electrical signal. Because the signals reflected by the fingerprint ridges are different, fingerprint recognition can be achieved. In the case of fingerprint recognition using ambient light, when finger F touches the upper surface of the display substrate, ambient light passes through finger F downwards through the various film layers between the photoelectric conversion layer PIN and the upper surface of the display substrate to reach the photoelectric conversion layer PIN. The photoelectric conversion layer PIN converts the reflected light from the fingerprint into an electrical signal. Because the signals reflected by the fingerprint ridges are different, fingerprint recognition can be achieved.

[0095] In some embodiments, in the display substrate provided in the present disclosure, such as Figures 21 to 25 As shown, the photoelectric conversion layer PIN of each photosensitive device 103 may include multiple photoelectric conversion sections S (e.g., including a first photoelectric conversion section S1, a second photoelectric conversion section S2, and a third photoelectric conversion section S3), and each photoelectric conversion section S (e.g. Figure 5 The effective photosensitive area S' of the photoelectric conversion unit S shown has the same orthographic projection shape on the substrate 101 and the area (e.g.) Figure 5 The effective photosensitive areas (S') shown are equal to ensure that the effective photosensitive area within the pixel region of each photosensitive device 103 is consistent. Of course, in some embodiments, such as Figure 26 and Figure 27As shown, each photosensitive device 103 may have only one photoelectric conversion layer PIN.

[0096] In some embodiments, in the display substrate provided in this disclosure, in order to ensure that the photosensitive areas of each photosensitive device 103 are uniformly distributed, thereby improving the uniformity of fingerprint imaging, such as... Figure 21 As shown, the plurality of photoelectric conversion units S in the same photosensitive device 103 can be rotationally symmetrical about the center of the photosensitive device 103. For example, as... Figure 21 As shown, in the same photosensitive device 103, the photoelectric conversion layer PIN includes three photoelectric conversion sections S (e.g., a first photoelectric conversion section S1, a second photoelectric conversion section S2, and a third photoelectric conversion section S3). Each photoelectric conversion section S can be rotated symmetrical about the center of the photosensitive device 103, such that the center line connecting each photoelectric conversion section S forms an equilateral triangle.

[0097] In some embodiments, in the display substrate provided in the present disclosure, such as Figure 22 As shown, four photosensitive devices 103 in every two adjacent rows and two columns form a repeating unit. Specifically, in Figure 22 The horizontal and vertical dotted lines divide the area into four regions, each containing a photosensitive device 103. Each photoelectric conversion unit S within the repeating unit can be rotated symmetrical about the center of the repeating unit, thereby making the photoelectric conversion units S evenly distributed on the display substrate, which helps to improve the fingerprint recognition effect.

[0098] In some embodiments, in the display substrate provided in the present disclosure, such as Figures 22 to 28 As shown, in the same photosensitive device 103, the orthogonal projections of all photoelectric conversion units S on the substrate 101 are located within the orthogonal projection of the first electrode a on the substrate 101, so as to facilitate the output of the electrical signal converted by all photoelectric conversion units S contained in the same photosensitive device 103 through the first electrode a. Optionally, the first electrode a is electrically connected to the first transistor TFT1, and is... Figures 28 to 30 It is evident that the orthographic projection of the first electrode a onto the substrate 101 overlaps to some extent with the orthographic projections of the first transistor TFT1, readout line 109, gate line 110, etc., onto the substrate 101. This causes coupling capacitance to form between the first electrode a and the first transistor TFT1, readout line 109, gate line 110, etc., resulting in mutual interference. Therefore, in practical implementation, the overlap area between the first electrode a and the first transistor TFT1, readout line 109, gate line 110, etc., should be minimized as much as possible. Obviously, compared to the case where the photosensitive device 103 contains multiple photoelectric conversion units S, it is more beneficial to avoid overlap between the first electrode a and the first transistor TFT1, readout line 109, gate line 110, etc., when the photosensitive device 103 contains only one photoelectric conversion unit S.

[0099] In some embodiments, such as Figures 22 to 28 As shown, it may also include a bias line 111 electrically connected to the top electrode (not shown) of each photosensitive device 103, optionally, as... Figure 6 , Figures 17 to 19 As shown, the bias line 111 can be disposed on the same layer as the bottom electrode A of the light-emitting device 102, so that the bias line 111 and the bottom electrode A can be fabricated using the same mask process, avoiding the need for an additional mask process for the bias line 111. The bias line 111 needs to be electrically connected to the second electrode of the photosensitive device 103, and the orthographic projection of the second electrode is located within the orthographic projection of the photoelectric conversion section S. Therefore, the bias line 111 will block part of the area of ​​the photoelectric conversion section S. The area of ​​the photoelectric conversion section S not blocked by the bias line 111 constitutes the effective photosensitive area S' of the photoelectric conversion section S (e.g., ...). Figure 5 (as shown); In this case, the size of the photoelectric conversion unit S in this disclosure can be specifically equivalent to the size of the effective photosensitive area S' in the photoelectric conversion unit S. Of course, in some embodiments, the entire area of ​​the photoelectric conversion unit S can also be used as the effective photosensitive area S', and the photoelectric conversion layer PIN outside the photoelectric conversion unit S can be used as a support for carrying the through hole connecting the second electrode and the bias line 111; in this case, the size of the photoelectric conversion unit S in this disclosure is its actual size.

[0100] Additionally, in some embodiments, such as Figure 6 , Figures 17 to 19 As shown, the substrate may also include a second transistor TFT2 electrically connected to the light-emitting device 102, a back film 112, a buffer layer 113, a first gate insulating layer 114, a second gate insulating layer 115, a second gate metal layer 116, an interlayer dielectric layer 117, a first insulating layer 118, a second planarization layer 119, a second insulating layer 120, a protective layer 121, a support layer 122, a first inorganic encapsulation layer 123, an organic encapsulation layer 124, a second inorganic encapsulation layer 125, a third planarization layer 126, a fourth planarization layer 127, a first adhesive layer 128, an ultrathin glass layer 129, a second adhesive layer 130, and a polyester film layer 131. Other essential components of the display substrate are those that should be understood by those skilled in the art and are not described in detail here, nor should they be construed as limiting the scope of this disclosure.

[0101] Based on the same inventive concept, this disclosure provides a display device including the display substrate described above. Since the principle by which this display device solves the problem is similar to that of the display substrate, the implementation of the display device provided in this disclosure can refer to the implementation of the display substrate described above, and repeated details will not be described again.

[0102] In some embodiments, the display device provided in this disclosure can be any product or component with display functionality, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, navigator, smartwatch, fitness wristband, or personal digital assistant. This display device includes, but is not limited to, components such as a radio frequency unit, network module, audio output & input unit, sensor, display unit, user input unit, interface unit, memory, processor, and power supply. Furthermore, those skilled in the art will understand that the above structure does not constitute a limitation on the display device provided in this disclosure. In other words, the display device provided in this disclosure may include more or fewer of the aforementioned components, or combine certain components, or have different component arrangements.

[0103] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this disclosure without departing from the spirit and scope of the embodiments of this disclosure. Therefore, if these modifications and variations to the embodiments of this disclosure fall within the scope of the claims of this disclosure and their equivalents, this disclosure is also intended to include these modifications and variations.

Claims

1. A display substrate, wherein, include: Substrate; Multiple light-emitting devices are arranged in an array on the substrate. Multiple photosensitive devices are arranged in an array on the substrate. The orthographic projection of each photosensitive device on the substrate overlaps with the orthographic projection of the gap between each light-emitting device on the substrate. Each photosensitive device includes a photoelectric conversion layer, which includes multiple photoelectric conversion sections. The orthographic projections of each photoelectric conversion section on the substrate have the same shape and equal area. In the same photosensitive device, each photoelectric conversion section is rotationally symmetrical about the center of the photosensitive device. In the same photosensitive device, the photoelectric conversion layer includes three photoelectric conversion sections, and the center lines connecting the photoelectric conversion sections form an equilateral triangle. Four photosensitive devices in every two adjacent rows and two columns form a repeating unit, and the photoelectric conversion sections in the repeating unit are rotationally symmetrical about the center of the repeating unit. A black matrix is ​​located on the side of the layer containing the light-emitting devices that faces away from the substrate. The orthographic projection of the black matrix onto the substrate overlaps with the orthographic projection of the gaps between the light-emitting devices onto the substrate. The black matrix has multiple openings, and the orthographic projections of these openings onto the substrate overlap with the orthographic projections of the photoelectric conversion unit onto the substrate. The collimation angle θ in any direction determined by the openings and the photoelectric conversion unit satisfies the following relationship: 0°≤θ≤arctan ; Where P is the ridge size of the fingerprint, and H is the distance from the contact surface between the fingerprint and the display substrate to the end face of the opening away from the substrate.

2. The display substrate as claimed in claim 1, wherein, The opening corresponds one-to-one with the photoelectric conversion unit. The orthographic projection of the photoelectric conversion unit on the substrate completely covers the orthographic projection of the corresponding opening on the substrate. Furthermore, the orthographic projection of the center of the opening on the substrate roughly coincides with the orthographic projection of the center of the corresponding photoelectric conversion unit on the substrate.

3. The display substrate as described in claim 1 or 2, wherein, In the same direction, the ratio of the size of the opening to the size of the photoelectric conversion unit is greater than or equal to 0.8 and less than or equal to 1.

4. The display substrate as described in claim 3, wherein, The orthographic projection shape of the opening on the substrate and the orthographic projection shape of the photoelectric conversion part on the substrate are both rectangular; The collimation angle θ1 along the long side of the rectangle, the collimation angle θ2 along the wide side, and the collimation angle θ3 along the diagonal, determined by the opening and the photoelectric conversion unit, satisfy the following relationship: θ1=arctan ; θ2=arctan ; θ3=arctan ; Where h is the distance between the surface of the photoelectric conversion section away from the substrate and the end face of the opening away from the substrate, and d is the distance between the two surfaces. L d is the length of the photoelectric conversion unit. S D is the width of the photoelectric conversion unit. L D is the length of the opening. S The width of the opening.

5. The display substrate as claimed in claim 4, wherein, 1≤d L / d S ≤1.3,1≤D L / D S ≤1.3。 6. The display substrate as claimed in claim 4 or 5, wherein, 200μm≤P≤500μm,4μm≤ h≤22μm,7μm≤d L ≤14μm,7≤d S ≤18.2μm,5.6μm≤D L ≤14μm,5.6μm≤D S ≤18.2μm。 7. The display substrate as described in claim 1 or 2, wherein, In the same direction, the ratio of the size of the opening to the size of the photoelectric conversion unit is greater than 0 and less than 0.

8.

8. The display substrate as claimed in claim 3, wherein, The orthographic projection shape of the opening on the substrate and the orthographic projection shape of the photoelectric conversion part on the substrate are both polygonal or circular.

9. The display substrate according to any one of claims 1, 2, 4, 5, and 8, wherein, The photosensitive device includes a first electrode; in the same photosensitive device, the orthogonal projection of the photoelectric conversion unit on the substrate is located within the orthogonal projection of the first electrode on the substrate.

10. The display substrate according to any one of claims 1, 2, 4, 5, and 8, wherein, It also includes a filter layer located on the side of the photosensitive device away from the substrate, wherein the orthographic projection of the filter layer on the substrate overlaps with the orthographic projection of the photoelectric conversion unit on the substrate, and the filter layer is configured to block ambient light above 600nm.

11. The display substrate as claimed in claim 10, wherein, The filter layer fills the opening, and the orthographic projection of the filter layer on the substrate roughly coincides with the orthographic projection of the opening on the substrate.

12. The display substrate as claimed in claim 11, wherein, It also includes a blue light resist located on the side of the black matrix away from the substrate, and the filter layer is disposed in the same layer as the blue light resist.

13. The display substrate as claimed in claim 12, wherein, It also includes a pixel delimiting layer located between the bottom electrode layer of the light-emitting device and the light-emitting functional layer of the light-emitting device, wherein the pixel delimiting layer is reused as the filter layer.

14. The display substrate as claimed in claim 10, wherein, It also includes a pixel delimiting layer located between the bottom electrode layer of the light-emitting device and the light-emitting functional layer of the light-emitting device; The filter layer is located between the pixel defining layer and the light-emitting functional layer of the light-emitting device, and the orthographic projection of the filter layer on the substrate is located within the orthographic projection of the pixel defining layer on the substrate.

15. The display substrate as claimed in claim 10, wherein, It also includes a planarization layer located between the layer containing the photosensitive device and the layer containing the light-emitting device, the planarization layer being reused as the filter layer.

16. A display device, wherein, Includes the display substrate as described in any one of claims 1 to 15.

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