Electroluminescent sensor

Abstract

An electroluminescent sensor, the electroluminescent sensor comprising: a sensor panel (10), which comprises a plurality of sensing units (11) arranged in an array; and an electroluminescent film (20), which is located on the sensor panel (10). The electroluminescent film (20) comprises: a plurality of light-emitting units (21) arranged in an array, and collimation structures (22) surrounding the light-emitting unit (21), wherein the orthographic projection of one light-emitting unit (21) on the sensor panel (10) completely covers the orthographic projection of at least one sensing unit (11) on the sensor panel (10).

Description

An electroluminescent sensor Technical Field

[0001] The present disclosure relates to the field of fingerprint recognition technology, and in particular to an electroluminescent sensor. Background Art

[0002] With the rapid development of communication, network, and financial technologies, information security has become more important than ever before, and the application of human identity recognition technology is becoming more and more widespread. Biometrics refers to the science and technology of automatically identifying individuals using physiological characteristics (such as face, fingerprints, palm prints) or behavioral characteristics. Fingerprints are one of the most widely used physiological characteristics. Due to their uniqueness and permanence, they have gained people's attention.

[0003] Fingerprint sensors can be categorized by their operating principle as photoelectric, capacitive, pressure-sensitive, thermal, and ultrasonic. Photoelectric fingerprint sensors are widely used due to their low cost and large-scale fabrication. Optical fingerprint sensors are key components for fingerprint acquisition. Electroluminescent fingerprint sensors, unlike traditional optical fingerprint sensors, do not require a backlight. Their electroluminescent film emits light when driven by an AC voltage. Improving the performance and environmental versatility of electroluminescent fingerprint sensors has become a pressing technical challenge.

[0004] Summary of the Invention

[0005] The present disclosure provides an electroluminescent sensor, the specific scheme is as follows:

[0006] The present disclosure provides an electroluminescent sensor, comprising:

[0007] A sensor panel comprising a plurality of sensing units arranged in an array;

[0008] an electroluminescent film located on the sensor panel, the electroluminescent film comprising a plurality of light-emitting units arranged in an array and a collimating structure surrounding each of the light-emitting units;

[0009] The orthographic projection of one of the light-emitting units on the sensor panel completely covers the orthographic projection of at least one of the sensing units on the sensor panel.

[0010] Optionally, in the embodiment of the present disclosure, the orthographic projection of one of the light-emitting units on the sensor panel covers the orthographic projection of one of the sensing units on the sensor panel.

[0011] Optionally, in the embodiment of the present disclosure, the orthographic projection of one light-emitting unit on the sensor panel covers the orthographic projections of multiple sensing units on the sensor panel.

[0012] Optionally, in an embodiment of the present disclosure, the electroluminescent film further includes a transparent bottom electrode located between the multiple light-emitting units and the sensor panel, the transparent bottom electrode is arranged as a whole layer, and the orthographic projections of the multiple light-emitting units on the sensor panel completely fall within the area of ​​the orthographic projection of the transparent bottom electrode on the sensor panel.

[0013] Optionally, in the embodiment of the present disclosure, the collimating structure includes a main body portion surrounding the corresponding light-emitting unit.

[0014] Optionally, in an embodiment of the present disclosure, along a direction parallel to the plane where the sensor panel is located, the cross-sectional area of ​​the main body tends to increase in a direction away from the sensor panel.

[0015] Optionally, in an embodiment of the present disclosure, along a direction parallel to the plane where the sensor panel is located, the cross-sectional area of ​​the main body tends to decrease in a direction away from the sensor panel.

[0016] Optionally, in the embodiment of the present disclosure, the electroluminescent film further includes a bottom electrode unit corresponding one-to-one to each of the light-emitting units, and the orthographic projection of the light-emitting unit on the sensor panel completely falls within the area of ​​the orthographic projection of the corresponding bottom electrode unit on the sensor panel.

[0017] Optionally, in the embodiment of the present disclosure, each of the bottom electrode units is connected via a common grid line and is connected to a peripheral signal line surrounding the corresponding light-emitting unit.

[0018] Optionally, in an embodiment of the present disclosure, the collimating structure includes a first part arranged around the bottom electrode unit, and a second part correspondingly surrounding the light-emitting unit; the orthographic projection of the first part on the sensor panel completely falls within the area of ​​the orthographic projection of the second part on the sensor panel.

[0019] Optionally, in an embodiment of the present disclosure, along a direction parallel to the plane where the sensor panel is located, the cross-sectional area of ​​the collimating structure tends to increase along a direction away from the sensor panel.

[0020] Optionally, in an embodiment of the present disclosure, along a direction parallel to the plane where the sensor panel is located, the cross-sectional area of ​​the first part is a first area, the cross-sectional area of ​​the second part is a second area greater than the first area, and along a direction away from the sensor panel, the second area tends to increase.

[0021] Optionally, in an embodiment of the present disclosure, along a direction parallel to the plane where the sensor panel is located, the collimating structure is a grid-like structure including multiple hollow areas, and the orthographic projection of each of the light-emitting units on the sensor panel completely falls within the area of ​​the orthographic projection of the corresponding hollow area on the sensor panel.

[0022] Optionally, in the embodiment of the present disclosure, the material of the collimating structure is light reflecting type or light absorbing type.

[0023] Optionally, in an embodiment of the present disclosure, the light collection angle of the collimating structure satisfies the formula: θ≤α, wherein tanθ=(2D-2h*cotβ) / 2h, α=arctan(X / 2H), θ represents the light collection angle of the collimating structure, α represents the maximum critical value that the light collection angle can reach, D represents the aperture of the light-emitting unit facing away from the sensor panel, h represents the thickness of the light-emitting unit, β represents the angle between the side wall of the collimating structure and the corresponding bottom, X represents the fingerprint valley ridge spacing, H represents the distance between the interface where the user's finger is located and the sensor panel, and the light collection angle is used to characterize the collimating ability of the collimating structure to collimate light.

[0024] Optionally, in an embodiment of the present disclosure, the spacing between the collimating structures satisfies the formula: P=H*tanγ, where P represents the spacing between the collimating structures, and γ represents the maximum angle of light emitted by the light-emitting unit.

[0025] Optionally, in the embodiment of the present disclosure, the aperture of the light emitting unit on the side facing away from the sensor panel satisfies the formula: 2*k*d≤D, where k is a positive integer and d represents the size of each of the sensing units.

[0026] Optionally, in the embodiment of the present disclosure, the size of each of the sensing units satisfies the formula: d=25400 / A, where A represents the resolution of the sensor panel.

[0027] Optionally, in the embodiment of the present disclosure, a flexible substrate located between the electroluminescent film and the sensor panel, and a glue layer located between the flexible substrate and the sensor panel are further included. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a schematic cross-sectional view of a conventional electroluminescent fingerprint sensor product structure;

[0029] FIG2 is a schematic diagram of a top view of a structure corresponding to FIG1 ;

[0030] FIG3 is a schematic diagram of a structure of an electroluminescent sensor provided in an embodiment of the present disclosure;

[0031] FIG4 is a schematic diagram of a structure of an electroluminescent sensor provided in an embodiment of the present disclosure;

[0032] FIG5 is a schematic diagram of a structure of an electroluminescent sensor provided in an embodiment of the present disclosure;

[0033] FIG6 is a schematic diagram of a structure of an electroluminescent sensor provided in an embodiment of the present disclosure;

[0034] FIG7 is a schematic diagram of a structure of an electroluminescent sensor provided in an embodiment of the present disclosure;

[0035] FIG8 is a schematic diagram of a top view of one type of structure corresponding to the electroluminescent sensor shown in FIG3 and FIG4;

[0036] FIG9 is a schematic diagram of a top view of one type of structure corresponding to the electroluminescent sensor shown in FIG5 ;

[0037] FIG10 is a schematic diagram of a top view of one structure corresponding to the electroluminescent sensor shown in FIG6 ;

[0038] FIG11 is a schematic diagram of a top view of one type of structure corresponding to the electroluminescent sensor shown in FIG7 ;

[0039] FIG12 is a schematic diagram of a top view of one type of the collimating structure in FIG4 ;

[0040] FIG13 is a schematic diagram of a structure of an electroluminescent sensor provided in an embodiment of the present disclosure;

[0041] FIG14 is a schematic diagram of related structural parameters between the collimating structure and the light-emitting unit in the electroluminescent sensor shown in FIG4 ;

[0042] FIG15 is a schematic diagram of relevant structural parameters of a single light-emitting unit in the electroluminescent sensor shown in FIG4 ;

[0043] FIG16 is a flow chart of one method of manufacturing an electroluminescent sensor provided in an embodiment of the present disclosure;

[0044] FIG17 is a flow chart of one of the methods for manufacturing an electroluminescent sensor provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0045] In order to make the purpose, 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 in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. And in the absence of conflict, the embodiments in the present disclosure and the features in the embodiments can be combined with each other. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0046] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by people with ordinary skills in the field to which this disclosure belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Inside", "outside", "upper", "lower" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0047] It should be noted that the sizes and shapes of the figures in the accompanying drawings do not reflect the actual scale and are only for the purpose of illustrating the present disclosure. The same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0048] In the related art, as shown in Figures 1 and 2, Figure 1 is a schematic diagram of a cross-sectional structure of a conventional electroluminescent fingerprint sensor product structure, and Figure 2 is a schematic diagram of a top-down structure corresponding to Figure 1, wherein 01 represents an electroluminescent film, 02 represents a sensor panel, and 03 represents a sensor pixel unit. Specifically, by preparing a whole layer of electroluminescent film on the sensor panel, the various film layer structures included in the electroluminescent film have no pattern design. In this case, after the light-emitting layer in the electroluminescent film is excited, the light divergence angle is relatively scattered, and light crosstalk is very likely to occur, resulting in blurred fingerprint imaging and poor imaging quality.

[0049] In view of this, an embodiment of the present disclosure provides an electroluminescent sensor for avoiding optical crosstalk and improving the imaging quality of fingerprint recognition.

[0050] As shown in FIG3 , an embodiment of the present disclosure provides an electroluminescent sensor, which includes:

[0051] The sensor panel 10 includes a plurality of sensing units 11 arranged in an array;

[0052] An electroluminescent film 20 is located on the sensor panel 10 , and includes a plurality of light-emitting units 21 arranged in an array, and a collimating structure 22 surrounding each of the light-emitting units 21 ;

[0053] The orthographic projection of one of the light-emitting units 21 on the sensor panel 10 completely covers the orthographic projection of at least one of the sensing units 11 on the sensor panel 10 .

[0054] An embodiment of the present disclosure provides an electroluminescent sensor, wherein the electroluminescent sensor includes a sensor panel 10, wherein the sensor panel 10 includes a plurality of sensing units 11 arranged in an array. Exemplarily, each sensing unit 11 may be a PIN. Furthermore, the electroluminescent sensor also includes an electroluminescent film 20 located on the sensor panel 10, wherein the electroluminescent film 20 includes a plurality of light-emitting units 21 arranged in an array, and a collimating structure 22 surrounding each light-emitting unit 21. Exemplarily, the light-emitting unit 21 may be an electroluminescent diode, and the collimating structure may be a black matrix (BM). Since the electroluminescent film 20 is isolated into multiple independent light-emitting units 21, and the collimating structure 22 is arranged around each light-emitting unit 21, in the process of bio-texture (for example, fingerprint) recognition, once the touch area stimulates the corresponding light-emitting unit 21 to emit light, the signal light generated will be collimated by the collimating structure 22, which effectively limits the light diffusion, prevents the interference of stray light on the signal light, and improves the purity and signal amount of the signal light received by the sensing unit 11, thereby ensuring the clarity of the bio-texture image and improving the accuracy of bio-texture recognition.

[0055] In a specific implementation, the electroluminescent sensor includes a sensor panel 10, which includes a plurality of sensing units 11 arranged in an array. The specific number and arrangement of the plurality of sensing units 11 can be set according to actual application requirements and are not limited herein. For example, each sensing unit 11 can be a photosensitive device, such as an a-Si PIN photodiode sensor, or an a-Si APD sensor, for example, without limitation herein. Furthermore, the electroluminescent sensor also includes an electroluminescent film 20 located on the sensor panel 10, the electroluminescent film 20 including a plurality of light-emitting units 21 arranged in an array, and a collimating structure 22 surrounding each light-emitting unit 21. For example, the light-emitting unit 21 can be an electroluminescent diode, such as an organic light-emitting diode (OLED) or a quantum dot light-emitting diode (QLED). Of course, the light-emitting unit 21 can also be arranged according to actual application requirements and is not limited herein. The specific number and arrangement of the plurality of light-emitting units 21 can be set according to actual application requirements and are not limited here.

[0056] Furthermore, since the collimating structure 22 is disposed around each light-emitting unit 21, the collimating structure 22 accordingly isolates the electroluminescent film 20 into a plurality of independent light-emitting units 21. Thus, during fingerprint recognition using an electroluminescent sensor, the collimating structure 22 surrounding each light-emitting unit 21 can collimate the signal light generated by the electroluminescent film 20, effectively limiting light diffusion and preventing stray light from interfering with the signal light. This ensures the clarity of the acquired fingerprint image and thereby improves the accuracy of fingerprint recognition.

[0057] Furthermore, in a specific implementation, the orthographic projection of one light-emitting unit 21 on the sensor panel 10 completely covers the orthographic projection of at least one sensor unit 11 on the sensor panel 10. This allows for the fingerprint recognition process to be performed so that once the light-emitting unit at the corresponding fingerprint location is excited, it generates a greater amount of signal light, ensuring sufficient signal reception by the corresponding sensor unit 11. Exemplarily, the orthographic projection of one light-emitting unit 21 on the sensor panel 10 completely covers the orthographic projection of one sensor unit 11 on the sensor panel 10. For example, in this exemplary embodiment, one light-emitting unit 21 is provided in a one-to-one correspondence with one sensor unit 11. In another exemplary embodiment, the orthographic projection of one light-emitting unit 21 on the sensor panel 10 completely covers the orthographic projections of multiple sensor units 11 on the sensor panel 10. For example, one light-emitting unit 21 is provided in a one-to-one correspondence with multiple sensor units 11. Of course, the correspondence between light-emitting units 21 and sensor units 11 can also be configured based on actual application needs, and this is not a limitation here. This ensures that the multiple sensing units 11 effectively absorb the signal light from the light-emitting units 21. In this exemplary embodiment, the collimating structures 22 surrounding each light-emitting unit 21 can still collimate and limit the light generated by the light-emitting unit 21, thereby preventing stray light from affecting the corresponding sensing unit 11 and improving the accuracy of fingerprint recognition.

[0058] It should be noted that the luminescent materials of each light-emitting unit 21 include, but are not limited to, polymer glue doped with nano-luminescent materials, quantum dots (QDs), etc. In practical applications, the light-emitting units 21 can be manufactured using a film-forming process, including but not limited to printing, evaporation, screen printing, spin coating, spraying, hydrophobic treatment, etc.

[0059] In the embodiment of the present disclosure, the configuration of the light emitting unit 21 and the sensor unit 11 may be as follows, but is not limited to the following.

[0060] In one of the exemplary embodiments, as shown in FIG4 , the orthographic projection of one of the light-emitting units 21 on the sensor panel 10 covers the orthographic projection of one of the sensing units 11 on the sensor panel 10. For example, in the exemplary embodiment shown in FIG5 , one light-emitting unit 21 is provided in a one-to-one correspondence with one sensing unit 11. In this way, the orthographic projection of the collimating structure 22 on the sensor panel 10 and the orthographic projection of the sensing unit 11 on the sensor panel 10 do not overlap with each other. During the fingerprint recognition process, the light-emitting unit 21 at the position touched by the user's finger emits light, and the relevant light is collimated and limited by the collimating structure 22 to prevent light diffusion, avoid crosstalk of stray light on effective light, and increase the amount of effective light received by the corresponding sensing unit 11.

[0061] In one of the exemplary embodiments, as shown in FIG5 , the orthographic projection of one of the light-emitting units 21 on the sensor panel 10 covers the orthographic projections of multiple sensing units 11 on the sensor panel 10. Accordingly, in the exemplary embodiment shown in FIG5 , one light-emitting unit 21 is provided corresponding to multiple sensing units 11. In this way, the orthographic projection of the collimating structure 22 on the sensor panel 10 still does not overlap with the orthographic projections of multiple sensing units 11 on the sensor panel 10. During the fingerprint recognition process, the light-emitting unit 21 at the position touched by the user's finger emits light, and the relevant light is collimated and limited by the collimating structure 22 to prevent light diffusion, avoid crosstalk of stray light on effective light, and increase the amount of effective light received by the corresponding sensing unit 11.

[0062] It should be noted that in the exemplary embodiment shown in FIG3 , along a direction perpendicular to the plane of the sensor panel 10, the cross-sectional area of ​​the collimating structure 22 increases in a direction away from the sensor panel 10, while the cross-sectional area of ​​the light-emitting unit 21 decreases in a direction away from the sensor panel 10. Exemplarily, the cross-sectional shape of the collimating structure 22 is an inverted trapezoid, while the cross-sectional shape of the light-emitting unit 21 is a right trapezoid. In the exemplary embodiments shown in FIG4 and FIG5 , along a direction perpendicular to the plane of the sensor panel 10, the cross-sectional area of ​​the collimating structure 22 decreases in a direction away from the sensor panel 10, while the cross-sectional area of ​​the light-emitting unit 21 increases in a direction away from the sensor panel 10. Exemplarily, the cross-sectional shape of the collimating structure 22 is a right trapezoid, while the cross-sectional shape of the light-emitting unit 21 is an inverted trapezoid. Of course, the cross-sectional shapes of the light-emitting unit 21 and the collimating structure 22 can also be configured according to actual application needs, and this is not limited here.

[0063] In the disclosed embodiment, still in conjunction with the exemplary embodiments shown in Figures 3 to 5, the electroluminescent film 20 further includes a transparent bottom electrode 30 located between the plurality of light-emitting units 21 and the sensor panel 10. The transparent bottom electrode 30 is provided as a single layer, and the orthographic projections of the plurality of light-emitting units 21 on the sensor panel 10 completely fall within the area of ​​the orthographic projection of the transparent bottom electrode 30 on the sensor panel 10. In other words, the transparent bottom electrode 30 is a single layer, unpatterned structure. In practical applications, the electroluminescent film 20 can be driven to emit light by an AC voltage. The transparent bottom electrode 30 can be connected to one terminal of an AC voltage with an effective value of 30V to 110V, and a finger can touch the other terminal of the AC voltage. When the finger presses on the electroluminescent film 20, an electric field is formed between the fingerprint ridge and the transparent bottom electrode 30, causing the light-emitting units 21 at the corresponding fingerprint ridge positions to emit light, thereby forming a fingerprint light pattern on the contact surface. The light is then emitted downward and received by the corresponding sensor unit 11, thereby achieving fingerprint imaging. Exemplarily, the material of the transparent bottom electrode 30 may be indium tin oxide (ITO) or indium zinc oxide (IZO), which is not limited here.

[0064] It should be noted that, in the exemplary embodiments shown in Figures 3 and 4, the orthographic projection of one light-emitting unit 21 on the sensor panel 10 covers the orthographic projection of one sensing unit 11 on the sensor panel 10, and the electroluminescent film 20 further includes a transparent bottom electrode 30 located between the multiple light-emitting units 21 and the sensor panel 10, and the transparent bottom electrode 30 is arranged in a whole layer, and the orthographic projections of the multiple light-emitting units 21 on the sensor panel 10 completely fall within the area of ​​the orthographic projection of the transparent bottom electrode 30 on the sensor panel 10.

[0065] In the exemplary embodiment shown in Figure 5, the orthographic projection of one light-emitting unit 21 on the sensor panel 10 covers the orthographic projections of multiple sensing units 11 on the sensor panel 10, and the electroluminescent film 20 further includes a transparent bottom electrode 30 located between the multiple light-emitting units 21 and the sensor panel 10. The transparent bottom electrode 30 is arranged in a whole layer, and the orthographic projections of the multiple light-emitting units 21 on the sensor panel 10 completely fall within the area of ​​the orthographic projection of the transparent bottom electrode 30 on the sensor panel 10.

[0066] In the embodiment of the present disclosure, still referring to FIG. 3 to FIG. 5 , the collimating structure 22 includes a main body portion 220 surrounding the corresponding light emitting unit 21 .

[0067] Still referring to the exemplary embodiment shown in FIG3 , along a direction parallel to the plane of the sensor panel 10, the cross-sectional area of ​​the main body 220 increases in a direction away from the sensor panel 10. For example, along a direction perpendicular to the plane of the sensor panel 10, the cross-sectional shape of the main body 220 is an inverted trapezoid.

[0068] 4 and 5 , along a direction parallel to the plane of the sensor panel 10, the cross-sectional area of ​​the main body 220 decreases in a direction away from the sensor panel 10. For example, along a direction perpendicular to the plane of the sensor panel 10, the cross-sectional shape of the main body 220 is a right trapezoid.

[0069] It should be noted that in the specific implementation process, along the direction perpendicular to the plane where the sensor panel is located, the cross-sectional shape of the main body 220 can be, in addition to the inverted trapezoidal structure and the regular trapezoidal structure mentioned above, also circular, rectangular and other structures, which are not limited here.

[0070] In the exemplary embodiment shown in FIG. 3 , along a direction perpendicular to the plane of the sensor panel 10 , the cross-sectional shape of each light emitting unit 21 is a regular trapezoid, and the cross-sectional shape of the main body 220 is an inverted trapezoid.

[0071] In the exemplary embodiments shown in FIG. 4 and FIG. 5 , along a direction perpendicular to the plane of the sensor panel 10 , the cross-sectional shape of each light emitting unit 21 is an inverted trapezoid, and the cross-sectional shape of the main body 220 is a regular trapezoid.

[0072] In practical applications, the cross-sectional shapes of the light emitting unit 21 and the main body 220 may be other shapes besides the above-mentioned configurations, which are not limited here.

[0073] In the embodiment of the present disclosure, as shown in Figures 6 and 7, the electroluminescent film 20 also includes a bottom electrode unit 40 corresponding one-to-one to each of the light-emitting units 21, and the orthographic projection of the light-emitting unit 21 on the sensor panel 10 completely falls within the area of ​​the orthographic projection of the corresponding bottom electrode unit 40 on the sensor panel 10.

[0074] In the exemplary embodiment shown in Figure 6, the orthographic projection of a light-emitting unit 21 on the sensor panel 10 covers the orthographic projection of a sensing unit 11 on the sensor panel 10, and the electroluminescent film 20 also includes a bottom electrode unit 40 corresponding to each light-emitting unit 21 one by one. The orthographic projection of the light-emitting unit 21 on the sensor panel 10 completely falls within the area of ​​the orthographic projection of the corresponding bottom electrode unit 40 on the sensor panel 10.

[0075] In the exemplary embodiment shown in Figure 7, the orthographic projection of one light-emitting unit 21 on the sensor panel 10 covers the orthographic projections of multiple sensing units 11 on the sensor panel 10, and the electroluminescent film 20 also includes a bottom electrode unit 40 corresponding to each light-emitting unit 21 one by one. The orthographic projection of the light-emitting unit 21 on the sensor panel 10 completely falls within the area of ​​the orthographic projection of the corresponding bottom electrode unit 40 on the sensor panel 10.

[0076] It should be noted that in the exemplary embodiments shown in Figures 6 and 7, the entire layer of transparent bottom electrode 30 can be patterned to obtain a plurality of bottom electrode units 40, and each bottom electrode unit 40 is provided in a one-to-one correspondence with each light-emitting unit 21, and the orthographic projection of the light-emitting unit 21 on the sensor panel 10 completely falls within the area of ​​the orthographic projection of the corresponding bottom electrode unit 40 on the sensor panel 10. In actual applications, the size of the bottom electrode unit 40 can be set to be slightly larger than the size of the light-emitting unit 21, for example, the size of the bottom electrode unit 40 is approximately 20% larger than the size of the light-emitting unit 21. Of course, the specific size of the bottom electrode unit 40 and the specific size of the light-emitting unit 21 can be set according to actual application requirements and are not limited here. In the exemplary embodiments shown in Figures 6 and 7, when a finger touches, for each light-emitting unit 21 at the fingerprint ridge position of the electroluminescent film 20, only the corresponding area of ​​the bottom electrode unit 40 is excited, interacting with the corresponding collimation structure 22, further strengthening the effect of collimation in limiting light diffusion, and being more conducive to increasing the amount of signal received by the sensing unit 11, improving the modulation transfer function (MTF) of the electroluminescent sensor, and thus improving the accuracy of fingerprint recognition.

[0077] In the disclosed embodiment, multiple light-emitting units 21 are located in a light-emitting region A. The electroluminescent sensor also includes a non-light-emitting region B surrounding the light-emitting region A. The light-emitting region A includes a plurality of gate lines G arranged along a first direction and a plurality of data lines D arranged along a second direction intersecting the first direction. As shown in FIG8 through FIG11 , the first direction is indicated by arrow x, and the second direction is indicated by arrow y. Specifically, in the non-light-emitting region B, the electroluminescent sensor includes a signal control circuit 50 and a signal readout circuit 60. Each gate line G is electrically connected to the sensing unit 11 and the signal control circuit 50, respectively. Each data line D is electrically connected to the sensing unit 11 and the signal readout circuit 60, respectively. Furthermore, the electroluminescent sensor also includes a reference voltage line VB electrically connected to the sensing unit 11, and the reference voltage line VB is electrically connected to the signal readout circuit 60.

[0078] In a specific implementation, taking a sensor unit 11 including a switching transistor 111 and a PIN photodiode 112 as an example, specifically, the gate of the switching transistor 111 is electrically connected to the gate line G, the first electrode of the switching transistor 111 is electrically connected to the data line D, the second electrode of the switching transistor 111 is electrically connected to the cathode of the PIN photodiode 112, and the anode of the PIN photodiode 112 is electrically connected to the reference voltage line VB. A top view of the electroluminescent sensor shown in Figures 3 and 4 is shown in Figure 8, and a top view of the electroluminescent sensor shown in Figure 5 is shown in Figure 9.

[0079] It should be noted that, depending on the signal flow method, the first electrode of the switching transistor 111 can serve as its source, and the second electrode can serve as its drain; alternatively, the first electrode can serve as its drain, and the second electrode can serve as its source, without making any specific distinction here. In addition, the switching transistor 111 in the embodiment of the present disclosure can be a thin film transistor (TFT) or a metal oxide semiconductor field effect transistor (MOS), without limitation here.

[0080] The top view structure diagram corresponding to the electroluminescent sensor shown in Figure 6 is shown in Figure 10, and the top view structure corresponding to the electroluminescent sensor shown in Figure 7 is shown in Figure 11. Specifically, each of the bottom electrode units 40 is connected through a common grid line 70 and is connected to the peripheral signal line 80 surrounding the corresponding light-emitting unit 21. In this way, in the non-luminous area B, the signal loading of each bottom electrode unit 40 can be achieved by loading the same common voltage to the peripheral signal line 80, and then through the common grid line 70. In this exemplary embodiment, the common grid line 70 includes a first branch 71 arranged along a first direction, and a second branch 72 arranged along a second direction; along a direction parallel to the first direction, each first branch 71 is electrically connected in sequence; along a direction parallel to the second direction, each second branch 72 is electrically connected in sequence. Of course, the common grid line 70 can also be set according to actual application needs, which is not limited here.

[0081] Continuing with the exemplary embodiment shown in FIG. 6 , the collimating structure 22 includes a first portion 221 disposed around the bottom electrode unit 40 and a second portion 222 correspondingly surrounding the light-emitting unit 21. The orthographic projection of the first portion 221 on the sensor panel 10 completely falls within the area of ​​the orthographic projection of the second portion 222 on the sensor panel 10. In the exemplary embodiment shown in FIG. 6 , when a finger touches the EL sensor, only the bottom electrode unit 40 in the corresponding area of ​​the light-emitting unit 21 corresponding to the fingerprint ridge is excited. Light is collimated and confined not only by the first portion 221 of the collimating structure 22, but also by the second portion 222 of the collimating structure 22. This further prevents light diffusion and improves the EL sensor's imaging quality, such as signal intensity and MTF.

[0082] In one exemplary embodiment, along a direction parallel to the plane of the sensor panel 10, the cross-sectional area of ​​the collimating structure 22 increases in a direction away from the sensor panel 10. FIG6 is a schematic diagram of one configuration of the collimating structure 22.

[0083] In one exemplary embodiment, along a direction parallel to the plane of the sensor panel 10, the cross-sectional area of ​​the first portion 221 is a first area, and the cross-sectional area of ​​the second portion 222 is a second area greater than the first area. Furthermore, the second area increases in a direction away from the sensor panel 10. Still referring to the exemplary embodiment shown in FIG6 , along a direction parallel to the plane of the sensor panel 10, the cross-sectional area of ​​the first portion 221 surrounding the bottom electrode unit 40 is the same value. Accordingly, along a direction perpendicular to the plane of the sensor panel 10, the cross-sectional shape of the first portion 221 is a rectangle. Along a direction parallel to the plane of the sensor panel 10, the cross-sectional area of ​​the second portion 222 surrounding the light-emitting unit 21 is a second area, which is greater than the first area. For example, the minimum value of the second area is still greater than the value of the first area. Accordingly, along a direction perpendicular to the plane of the sensor panel 10, the cross-sectional shape of the first portion 221 is a rectangle, and the cross-sectional shape of the second portion 222 is an inverted trapezoid. Of course, the cross-sectional shapes of the first portion 221 and the second portion 222 can also be set according to actual application needs and are not limited here.

[0084] In the disclosed embodiment, the collimating structure 22 is a grid-like structure W comprising a plurality of hollowed-out areas L, parallel to the plane of the sensor panel 10. The orthographic projections of the respective light-emitting units 21 on the sensor panel 10 completely fall within the orthographic projections of the corresponding hollowed-out areas L on the sensor panel 10. For example, FIG12 is a schematic top view of one embodiment of the collimating structure 22 in FIG4 . In one exemplary embodiment, the electroluminescent sensor further comprises a flexible substrate 90 positioned between the electroluminescent film 20 and the sensor panel 10, and an adhesive layer 91 positioned between the flexible substrate 90 and the sensor panel 10.

[0085] In conjunction with the exemplary embodiment shown in Figure 13, the electroluminescent sensor also includes a flexible substrate 90 located between the electroluminescent film 20 and the sensor panel 10. Exemplarily, the material of the flexible substrate 90 can be polyimide (PI) or polyethylene terephthalate (PET). Moreover, the electroluminescent sensor also includes a glue layer 91 located between the flexible substrate 90 and the sensor panel 10. Exemplarily, the material of the glue layer 91 is optically clear adhesive (OCA). Of course, the materials of the flexible substrate 90 and the glue layer 91 can also be set according to actual application needs, which is not limited here. In the specific implementation process, the electroluminescent film 20 can be first prepared on the flexible substrate 90, and then attached to the sensor panel 10 through the glue layer 91. In this exemplary embodiment, the overall antistatic ability of the electroluminescent sensor is improved, the yield is improved, and the cost is reduced.

[0086] It should be noted that in the disclosed embodiment, the side of each light-emitting unit 21 facing away from the sensor panel 10 and the side of the collimating structure 22 facing away from the sensor panel 10 are arranged flush in a direction parallel to the plane of the sensor panel 10. This not only ensures that the collimating structure 22 effectively confines light, but also ensures the flatness of subsequent film fabrication. Furthermore, in addition to the aforementioned film layer structure, the electroluminescent film 20 may also include a first dielectric layer 92 and a second dielectric layer 93 located on the side of the multiple light-emitting units 21 and the collimating structure 22 facing away from the sensor panel 10. Exemplarily, the first dielectric layer 92 may be a reinforced dielectric material, such as solid insulating glue: barium titanate: carbon black, in a ratio of 10:10:1, or even 10:10:1.5. Exemplarily, the second dielectric layer 93 may be a dielectric layer material, such as solid insulating glue: barium titanate, in a ratio of 2:1, or even 1:1. Of course, in addition to the aforementioned film layer structures, the electroluminescent film 20 may also include other film layer structures. For example, a patterned metal layer may be provided on the side of the second dielectric layer 93 facing away from the sensor panel 10, with the orthographic projection of this metal layer on the sensor panel 10 completely falling within the area of ​​the orthographic projection of the corresponding sensing unit 11 on the sensor panel 10 (not shown in the relevant drawings). In this way, the conductivity of the surface of the user's finger ridge is increased after contact, and a stronger electric field can be formed between the bottom electrode and the finger, which is conducive to obtaining a clearer fingerprint optical pattern and ensuring the accuracy of fingerprint recognition. Of course, other film layer structures can also be provided in accordance with relevant technologies, which will not be described in detail here.

[0087] In addition, the sensor panel 10 also includes a substrate 94, a gate layer 95, an active layer 96, a source and drain layer 97 sequentially disposed on the substrate 94, and a passivation layer 98 located on a side of the plurality of sensing units 11 facing away from the substrate 94. Of course, in addition to the aforementioned film structures, the sensor panel 10 may also include other film structures, such as a dielectric layer disposed between adjacent conductive layers, and a conductive layer and a dielectric layer disposed between the sensing units 11 and the electroluminescent film 20. The specific configuration can be determined by reference to related art and will not be described in detail here.

[0088] In the disclosed embodiment, the collimating structure 22 is made of a reflective or absorptive material. In practical applications, for example, if the collimating structure 22 is made of metal, using a wet etching process, the thickness of the collimating structure 22 can range from several hundred angstroms to 2 μm; using an electroplating process, the thickness of the collimating structure 22 can reach a range of several μm to tens of μm. Of course, the specific thickness of the collimating structure 22 can be set according to actual application needs and is not limited here.

[0089] In one exemplary embodiment, the material of the collimating structure 22 is a reflective light type, for example, it can be one of Al, Ag, and Mo / Al / Mo.

[0090] In one exemplary embodiment, the material of the collimating structure 22 is light-absorbing. For example, it can be BM. Of course, the specific material of the collimating structure 22 can also be set according to actual application needs, which is not limited here.

[0091] In the embodiment of the present disclosure, the light collection angle of the collimating structure 22 satisfies the formula: θ≤α, wherein tanθ=(2D-2h*cotβ) / 2h, α=arctan(X / 2H), θ represents the light collection angle of the collimating structure 22, α represents the maximum critical value that the light collection angle can reach, D represents the aperture of the light emitting unit 21 facing away from the sensor panel 10, h represents the thickness of the light emitting unit 21, β represents the angle between the side wall of the collimating structure 22 and the corresponding bottom, X represents the fingerprint valley ridge spacing, and H represents the distance between the interface where the user's finger is located and the sensor panel 10. The light collection angle is used to characterize the collimation ability of the collimating structure 22 for light.

[0092] During the specific implementation process, the relevant structural parameters of the collimating structure 22 and the light-emitting unit 21 can be specifically set according to the actual required light collection angle value range of the collimating structure 22.

[0093] In the embodiment of the present disclosure, the spacing between the collimating structures 22 satisfies the formula: P=H*tanγ, where P represents the spacing between the collimating structures 22 and γ represents the maximum angle of light emitted by the light emitting unit 21 .

[0094] During specific implementation, the spacing between the collimating structures 22 may be determined based on the maximum angle of light emitted by the light-emitting unit 21 that is actually required.

[0095] In the embodiment of the present disclosure, the aperture of the light emitting unit 21 facing away from the sensor panel 10 satisfies the formula: 2*k*d≤D, where k is a positive integer and d represents the size of each sensor unit 11. For example, k is 1, 2, 3, ...

[0096] During specific implementation, the aperture value of the corresponding light emitting unit 21 facing away from the sensor panel 10 may be determined according to the actual required size of the sensing unit 11 .

[0097] In the embodiment of the present disclosure, the size of each of the sensing units 11 satisfies the formula: d=25400 / A, where A represents the resolution of the sensor panel 10 .

[0098] During specific implementation, the distance between two adjacent sensing units 11 may be determined according to the specific resolution of the sensor panel 10 .

[0099] The following detailed explanation of the operating principles of the collimation structure 22 is provided in conjunction with Figures 14 and 15 . In Figure 14 , the bold arrows indicate stray light. In Figure 15 , the bold arrows on the left side of the figure indicate the stray effects from the stray light, while the right side of the figure is a schematic diagram of ray tracing for the stray light.

[0100] The inventors found in actual research that, taking the collimating structure 22 as BM as an example, in order to ensure that the collimating structure 22 plays a role in collimating the light signal, the maximum critical value of the light receiving angle must satisfy the formula: α = arctan (X / 2H). For example, if the light receiving angle of the collimating structure 22 is ±θ, correspondingly, tanθ = (2D-2h*cotβ) / 2h. In order to achieve the collimation function of the collimating structure 22, it is necessary to satisfy θ≤α. For example, θ≤±7°. The light receiving angle is used to characterize the collimating ability of the collimating structure 22 for light. The smaller the value, the better the collimation effect; α represents the maximum critical value that the light receiving angle can reach; X represents the fingerprint valley-ridge spacing; H represents the distance between the interface where the user's finger is located and the sensor panel 10. In the exemplary embodiment shown in Figure 3, H refers to the vertical distance from the contact surface between the finger and the second dielectric layer 93 to the PIN photodiode. It should be noted that the fingerprint ridge-valley distance refers to the distance between the centers of two adjacent ridges in a fingerprint, or the distance between the centers of two adjacent valleys in a fingerprint. In practical applications, the value of X ranges from 300μm to 500μm. For example, the value of X for an adult's thumb can be 400μm. This ensures that the electroluminescent sensor can meet the minimum fingerprint distance recognition. In addition, H can be the vertical distance from the finger interface to the corresponding sensor unit, and its value range can be 30μm to 2000μm.

[0101] In practical applications, D represents the diameter of a single light-emitting unit 21 on the side facing away from the sensor panel 10, and the value of D can range from 1 μm to 20 μm. h represents the thickness of the light-emitting unit 21, and the value of h can range from 1 μm to 20 μm. In addition, β represents the angle between the sidewall and the corresponding bottom of the collimating structure 22. In the specific implementation process, the value of β is related to the process photolithography (photo), and the value of β can range from 60° to 90°. For example, when β = 90°, tanθ = D / h.

[0102] In addition, P represents the spacing between the collimating structures 22. The spacing P directly affects the transmittance of the signal light received by the sensing unit 11, as well as the crosstalk to the signal light of the adjacent collimating structure 22 openings. In the exemplary embodiment shown in FIG13 , the spacing P is equal to the sum of the diameter of the single light-emitting unit 21 on the side facing away from the sensor panel 10 and the diameter of the adjacent collimating structure 22 on the side facing away from the sensor panel 10. In practical applications, the spacing between the collimating structures 22 needs to satisfy the formula: P = H*tanγ, where γ represents the maximum angle of light emitted by the light-emitting unit 21, and the numerical range of γ is 60° to 70°. In a specific implementation, the maximum light angle γ can be the angle at which the top and bottom diagonals of a single light-emitting unit 21 intersect with H. In a specific implementation, the value range of P can be determined based on the specific numerical ranges of H and γ, thereby achieving parameter setting for the corresponding structure.

[0103] In practical applications, for the structural parameters between the sensor unit 11 and the light-emitting unit 21, for example, the resolution of the sensor panel 10 is set to APPI (Pixels Per Inch), and the value of A can range from 100 to 2000. Then, the size of each sensor unit 11 needs to satisfy the formula: d = 25400 / A. The aperture of the light-emitting unit 21 facing away from the sensor panel 10 satisfies the formula: 2*k*d≤D, k = 1, 2, 3, ...; where d represents the size of each sensor unit 11, and its value can be expressed in μm. This ensures that the fingerprint acquisition process satisfies the Nyquist theorem. In this way, during the analog / digital signal conversion process, when the sampling frequency is at least twice the highest frequency in the signal, the sampled digital signal completely retains the information in the original signal, thereby improving the accuracy of fingerprint recognition.

[0104] It should be noted that the electroluminescent sensor provided in the embodiment of the present disclosure increases the light receiving efficiency of the sensing unit 11 by dividing the multiple light-emitting units 21 and the collimating structure 22. In this way, more light signals from the object to be identified (for example, fingerprints) can be received by the sensing unit 11, thereby increasing the accuracy of fingerprint recognition. In addition, the electroluminescent sensor provided in the embodiment of the present disclosure can be used not only for feature recognition of fingerprints, but also for feature recognition of biological textures such as palm prints. Of course, the electroluminescent sensor provided in the embodiment of the present disclosure can also be used in other fields, which are not limited here.

[0105] Based on the same disclosed concept, an embodiment of the present disclosure further provides a touch display device, which includes the above-mentioned electroluminescent sensor provided by the embodiment of the present disclosure. The principle of solving the problem by the touch display device is similar to that of the above-mentioned electroluminescent sensor. Therefore, the implementation of the touch display device can refer to the implementation of the above-mentioned electroluminescent sensor, and the repeated parts will not be repeated.

[0106] In specific implementations, the touch display device provided by the embodiments of the present invention can be any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigation system. Other essential components of the touch display device are well understood by those skilled in the art and are not detailed here, nor should they be construed as limitations of the present disclosure.

[0107] Based on the same disclosed concept, as shown in FIG16 , the embodiment of the present disclosure further provides a method for manufacturing an electroluminescent sensor, which includes:

[0108] S101: Obtain a sensor panel, wherein the sensor panel includes a plurality of sensing units arranged in an array;

[0109] S102: forming a plurality of light-emitting units arranged in an array on the sensor panel, and a collimating structure surrounding each of the light-emitting units, to obtain an electroluminescent film including the plurality of light-emitting units and the collimating structure; an orthographic projection of one of the light-emitting units on the sensor panel completely covers an orthographic projection of at least one of the sensing units on the sensor panel;

[0110] S103: forming an electroluminescent sensor including the sensor panel and the electroluminescent film.

[0111] In the specific implementation process, the specific implementation process of step S101 to step S103 is as follows:

[0112] First, a sensor panel comprising a plurality of sensing units arranged in an array is fabricated. Then, a plurality of light-emitting units arranged in an array and a collimating structure surrounding each light-emitting unit are formed on the sensor panel. In one exemplary embodiment, the plurality of light-emitting units arranged in an array may be formed on the sensor panel first, followed by the formation of the collimating structure surrounding each light-emitting unit. In another exemplary embodiment, a pattern of the collimating structure may be formed on the sensor panel first, followed by the formation of the plurality of light-emitting units arranged in an array. In this manner, an electroluminescent film comprising the plurality of light-emitting units and the collimating structure is formed. The orthographic projection of a light-emitting unit on the sensor panel completely covers the orthographic projection of at least one sensing unit on the sensor panel. Thus, an electroluminescent sensor comprising the sensor panel and the electroluminescent film is formed.

[0113] In the embodiment of the present disclosure, a transparent electrode structure is further provided between the plurality of light emitting units and the sensor panel. In the specific implementation process, the transparent electrode structure can be prepared in the following two situations, but is not limited to the following two situations.

[0114] In one exemplary embodiment, before step S102: forming a plurality of light-emitting units arranged in an array and a collimating structure surrounding each of the light-emitting units on the sensor panel, the method further includes:

[0115] A transparent bottom electrode is disposed on the entire sensor panel, and the orthographic projections of the plurality of light-emitting units on the sensor panel completely fall within the region of the orthographic projection of the transparent bottom electrode on the sensor panel.

[0116] In this exemplary embodiment, the obtained structure may be as shown in FIG. 3 to FIG. 5 .

[0117] In one exemplary embodiment, before step S102: forming a plurality of light-emitting units arranged in an array and a collimating structure surrounding each of the light-emitting units on the sensor panel, the method further includes:

[0118] Bottom electrode units corresponding to the light-emitting units are formed on the sensor panel, and the orthographic projections of the light-emitting units on the sensor panel completely fall within the area of ​​the orthographic projections of the corresponding bottom electrode units on the sensor panel.

[0119] In this exemplary embodiment, the obtained structure may be as shown in FIG. 6 and FIG. 7 .

[0120] It should be noted that in the exemplary embodiment shown in FIG16 , the relevant film layer structure of the electroluminescent film can be directly deposited on the sensor panel, and there is no need to set a separate adhesive layer between the electroluminescent film and the sensor panel. The entire process is simple and the signal quantity is better.

[0121] Based on the same disclosed concept, as shown in FIG17 , the embodiment of the present disclosure further provides a method for manufacturing an electroluminescent sensor, which includes:

[0122] S201: Obtain a sensor panel, wherein the sensor panel includes a plurality of sensing units arranged in an array;

[0123] S202: forming a plurality of light-emitting units arranged in an array on a flexible substrate, and a collimating structure surrounding each of the light-emitting units, to obtain an electroluminescent film including the plurality of light-emitting units and the collimating structure; an orthographic projection of one of the light-emitting units on the sensor panel completely covers an orthographic projection of at least one of the sensing units on the sensor panel;

[0124] S203: forming a glue layer on a side of the flexible substrate facing away from the electroluminescent film;

[0125] S204: bonding the electroluminescent film and the sensor panel together through the adhesive layer to form an electroluminescent sensor including the electroluminescent film and the sensor panel.

[0126] In a specific implementation, the execution order of step S201 and step S202 may be step S201 first and then step S202, or step S202 first and then step S201, or step S201 and step S202 may be executed simultaneously, without limitation herein. FIG17 illustrates the case where step S201 is executed first and then step S202. Of course, the execution order of step S201 and step S202 may be set according to actual application needs, without limitation herein.

[0127] In the exemplary embodiment shown in FIG17 , first, a sensor panel including a plurality of sensing units arranged in an array is fabricated; then, a plurality of light-emitting units arranged in an array are fabricated on a flexible substrate; then, a collimating structure surrounding each light-emitting unit is fabricated; thereby, an electroluminescent film including a plurality of light-emitting units and a collimating structure is obtained. The orthographic projection of one light-emitting unit on the sensor panel completely covers the orthographic projection of at least one sensing unit on the sensor panel; then, a glue layer is formed on the side of the flexible substrate facing away from the electroluminescent film; then, the electroluminescent film and the sensor panel are bonded together through the glue layer to form an electroluminescent sensor including the electroluminescent film and the sensor panel. Compared to the exemplary embodiment shown in FIG16 , the exemplary embodiment shown in FIG16 greatly improves the overall anti-static capability of the electroluminescent sensor, improves the yield rate, and reduces the cost.

[0128] An embodiment of the present disclosure provides an electroluminescent sensor, wherein the electroluminescent sensor includes a sensor panel, and the sensor panel includes a plurality of sensing units arranged in an array. Exemplarily, each sensing unit may be a PIN. Moreover, the electroluminescent sensor further includes an electroluminescent film located on the sensor panel, the electroluminescent film including a plurality of light-emitting units arranged in an array, and a collimating structure surrounding each light-emitting unit. Exemplarily, the light-emitting unit may be an electroluminescent diode, and the collimating structure may be a BM. Since the electroluminescent film is isolated into a plurality of light-emitting units independent of each other, and the collimating structure is arranged around each light-emitting unit, in this way, during the process of bio-texture (e.g., fingerprint) recognition, once the touch area excites the corresponding light-emitting unit to emit light, the signal light generated will be collimated by the collimating structure, effectively limiting light diffusion, preventing stray light from interfering with the signal light, and improving the purity and signal quantity of the signal light received by the sensing unit, thereby ensuring the clarity of the bio-texture image and improving the accuracy of bio-texture recognition.

[0129] Although the preferred embodiments of the present disclosure have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present disclosure.

[0130] Obviously, those skilled in the art may 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 equivalents, the present disclosure is intended to include these modifications and variations.

Claims

1. An electroluminescent sensor, wherein, Comprising: A sensor panel including a plurality of sensing units arranged in an array; An electroluminescent film located on the sensor panel, the electroluminescent film including a plurality of light-emitting units arranged in an array, and a collimating structure surrounding each of the light-emitting units; Wherein, the orthographic projection of one of the light-emitting units on the sensor panel completely covers the orthographic projection of at least one of the sensing units on the sensor panel.

2. The sensor according to claim 1, wherein, The orthographic projection of one of the light-emitting units on the sensor panel covers the orthographic projection of one of the sensing units on the sensor panel.

3. The sensor according to claim 1, wherein, The orthographic projection of one of the light-emitting units on the sensor panel covers the orthographic projections of a plurality of the sensing units on the sensor panel.

4. The sensor according to claim 2 or 3, wherein, The electroluminescent film further includes a transparent bottom electrode located between the plurality of light-emitting units and the sensor panel, the transparent bottom electrode being provided as a whole layer, and the orthographic projections of the plurality of light-emitting units on the sensor panel completely fall within the area range of the orthographic projection of the transparent bottom electrode on the sensor panel.

5. The sensor according to claim 4, wherein, The collimating structure includes a main body portion surrounding the corresponding light-emitting unit.

6. The sensor according to claim 5, wherein, Along a direction parallel to the plane where the sensor panel is located, the cross-sectional area of the main body portion shows an increasing trend in a direction away from the sensor panel.

7. The sensor according to claim 5, wherein, Along a direction parallel to the plane where the sensor panel is located, the cross-sectional area of the main body portion shows a decreasing trend in a direction away from the sensor panel.

8. The sensor according to claim 2 or 3, wherein The electroluminescent film further includes bottom electrode units corresponding to each of the light-emitting units one by one, and the orthographic projection of the light-emitting unit on the sensor panel completely falls within the area range of the orthographic projection of the corresponding bottom electrode unit on the sensor panel.

9. The sensor according to claim 8, wherein, Each of the bottom electrode units is connected by a common grid line and is connected to a peripheral signal line surrounding the corresponding light-emitting unit.

10. The sensor according to claim 8, wherein, The collimating structure includes a first portion surrounding the bottom electrode unit and a second portion correspondingly surrounding the light-emitting unit; the orthographic projection of the first portion on the sensor panel completely falls within the area range of the orthographic projection of the second portion on the sensor panel.

11. The sensor according to claim 10, wherein, Along a direction parallel to the plane where the sensor panel is located, the cross-sectional area of the collimating structure shows an increasing trend in a direction away from the sensor panel.

12. The sensor according to claim 11, wherein, Along a direction parallel to the plane where the sensor panel is located, the cross-sectional area of the first portion is a first area, the cross-sectional area of the second portion is a second area greater than the first area, and the second area shows an increasing trend in a direction away from the sensor panel.

13. The sensor according to any one of claims 1-12, wherein, Along a direction parallel to the plane where the sensor panel is located, the collimating structure is a grid-like structure including a plurality of hollow areas, and the orthographic projections of each of the light-emitting units on the sensor panel completely fall within the area range of the orthographic projection of the corresponding hollow area on the sensor panel.

14. The sensor according to claim 13, wherein, The material of the collimating structure is of a light-reflecting type or a light-absorbing type.

15. The sensor according to claim 13, wherein, The light collection angle of the collimating structure satisfies the formula: θ≤α, wherein tanθ=(2D-2h*cotβ) / 2h, α=arctan(X / 2H), θ represents the light collection angle of the collimating structure, α represents the maximum critical value that the light collection angle can reach, D represents the aperture of the light emitting unit away from the sensor panel, h represents the thickness of the light emitting unit, β represents the angle between the side wall of the collimating structure and the corresponding bottom, X represents the fingerprint valley ridge spacing, H represents the distance between the interface where the user's finger is located and the sensor panel, and the light collection angle is used to characterize the collimating ability of the collimating structure to light.

16. The sensor according to claim 15, wherein, The spacing between the collimating structures satisfies the formula: P=H*tanγ, where P represents the spacing between the collimating structures, and γ represents the maximum angle of light emitted by the light-emitting unit.

17. The sensor according to claim 16, wherein, The aperture of the light emitting unit on the side away from the sensor panel satisfies the formula: 2*k*d≤D, k is a positive integer, and d represents the size of each of the sensor units.

18. The sensor according to claim 17, wherein, The size of each of the sensing units satisfies the formula: d=25400 / A, where A represents the resolution of the sensor panel.

19. The sensor according to any one of claims 1-18, wherein, The invention also includes a flexible substrate located between the electroluminescent film and the sensor panel, and a glue layer located between the flexible substrate and the sensor panel.

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