Photosensitive components and electronic devices

Abstract

The present disclosure provides a photosensitive component and an electronic device, belonging to the field of sensor technology. The photosensitive component includes a light-transmitting cover plate, a piezoelectric device and a light sensor. The piezoelectric device is arranged on one side of the light-transmitting cover plate, and the light sensor is arranged on one side of the light-transmitting cover plate. The photosensitive component can realize a zoom function.

Description

Technical Field

[0001] The present disclosure relates to the field of sensor technology, and in particular, to a photosensitive component and an electronic device. Background Art

[0002] In the prior art, an infrared detection device may include a photosensitive element and a microlens located on one side of the photosensitive element. The incident infrared rays are converged to the central area of ​​the photosensitive element through the microlens, thereby improving the monitoring efficiency of the infrared detection device. However, in the prior art, the curvature radius of the microlens is fixed, and the zoom function cannot be achieved.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] The purpose of the present disclosure is to overcome the deficiencies of the above-mentioned prior art and to provide a photosensitive component and an electronic device so that the photosensitive component can sense targets at different distances.

[0005] According to one aspect of the present disclosure, a photosensitive component is provided, comprising:

[0006] Translucent cover plate;

[0007] A piezoelectric device is disposed on one side of the light-transmitting cover plate;

[0008] The light sensor is arranged on one side of the light-transmitting cover plate.

[0009] According to an embodiment of the present disclosure, the light-transmitting cover plate is a glass cover plate.

[0010] According to an embodiment of the present disclosure, the thickness of the light-transmitting cover plate is 0.01 to 10 mm.

[0011] According to an embodiment of the present disclosure, the piezoelectric devices are arranged into at least one piezoelectric device group extending along a first direction, and any one of the piezoelectric device groups includes at least one piezoelectric device.

[0012] According to an embodiment of the present disclosure, in at least one of the piezoelectric device groups, the piezoelectric device extends along the first direction to an edge of the light-transmitting cover plate.

[0013] According to an embodiment of the present disclosure, in at least one of the piezoelectric device groups, there is a gap between two ends of any one of the piezoelectric devices in the first direction and an edge of the light-transmitting cover plate.

[0014] According to an embodiment of the present disclosure, in at least one of the piezoelectric device groups, the number of the piezoelectric devices is multiple, and the multiple piezoelectric devices are arranged in sequence along the first direction.

[0015] According to one embodiment of the present disclosure, the light-transmitting cover plate has a first edge extending along the first direction; the distance between the center of the piezoelectric device closest to the first edge and the first edge is not less than half of a reference size; the reference size is half of the wavelength of the transverse wave transmitted when the light-transmitting cover plate vibrates at its first-order natural frequency.

[0016] According to one embodiment of the present disclosure, there are multiple piezoelectric device groups; the distance between the axes of two adjacent piezoelectric device groups along the first direction is in the range of (n+0.8)*Dref to (n+1.2)*Dref; wherein n is a natural number; and Dref is the reference size.

[0017] According to an embodiment of the present disclosure, the light-transmitting cover plate has a first edge extending along the first direction; the number of the piezoelectric device groups is multiple;

[0018] The distance between the axis of any one of the piezoelectric device groups along the first direction and the first edge is in the range of (n+0.3)*Dref to (n+0.7)*Dref; wherein n is a natural number; and Dref is a reference size, which is half the wavelength of the transverse wave transmitted when the transparent cover plate vibrates at its first-order natural frequency.

[0019] According to an embodiment of the present disclosure, the size of the piezoelectric device in the second direction is 1-10 mm, and the second direction is parallel to the plane where the light-transmitting cover plate is located and perpendicular to the first direction.

[0020] According to an embodiment of the present disclosure, the size of the piezoelectric device in the second direction is not greater than a reference size; the reference size is half the wavelength of the vibration wave transmitted when the light-transmitting cover plate vibrates at its first-order natural frequency;

[0021] The second direction is parallel to the plane where the light-transmitting cover plate is located and perpendicular to the first direction.

[0022] According to an embodiment of the present disclosure, the orthographic projection of the piezoelectric device on the light-transmitting cover plate does not overlap with the orthographic projection of the light sensor on the light-transmitting cover plate.

[0023] According to an embodiment of the present disclosure, along a direction perpendicular to the light-transmitting cover plate, the light transmittance of the piezoelectric device is not less than 10%;

[0024] An orthographic projection of at least part of the piezoelectric device on the light-transmitting cover plate at least partially overlaps with an orthographic projection of at least part of the light sensor on the light-transmitting cover plate.

[0025] According to an embodiment of the present disclosure, the photosensitive component further includes a collimator, and the collimator is located between the light sensor and the light-transmitting cover plate.

[0026] According to an embodiment of the present disclosure, the light sensors are multiple and distributed in an array;

[0027] The collimator comprises a light-shielding substrate, and the light-shielding substrate is provided with a plurality of light-transmitting holes which are arranged one by one corresponding to each of the light sensors; the orthographic projection of the light sensor on the light-shielding substrate at least partially overlaps with the corresponding light-transmitting hole.

[0028] According to an embodiment of the present disclosure, the collimator is connected to the light-transmitting cover plate via an optical adhesive layer.

[0029] According to an embodiment of the present disclosure, the refractive index of the optical adhesive layer is the same as the refractive index of the light-transmitting cover plate.

[0030] According to an embodiment of the present disclosure, along a direction perpendicular to the light-transmitting cover plate, the thickness of the piezoelectric device is 0.1 to 10 micrometers.

[0031] According to an embodiment of the present disclosure, the light sensor and the piezoelectric device are arranged on the same side of the light-transmitting cover plate.

[0032] According to a second aspect of the present disclosure, there is provided an electronic device comprising the above-mentioned photosensitive component.

[0033] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0035] Figure 1 It is a structural schematic diagram of an infrared detection device in the related technology.

[0036] Figure 2 It is a schematic diagram of the structure of a photosensitive component in one embodiment of the present disclosure.

[0037] Figure 3 It is a schematic diagram of the structure of a photosensitive component in one embodiment of the present disclosure.

[0038] Figure 4 This is a schematic diagram of a structure in which, in one embodiment of the present invention, a piezoelectric device is driven by an alternating voltage to vibrate to change the morphology of a transparent cover plate, thereby enabling a photosensitive component to detect a target object at a close distance.

[0039] Figure 5 In one embodiment of the present disclosure, a piezoelectric device is driven by an alternating voltage to vibrate to change the morphology of a transparent cover plate, thereby enabling a photosensitive component to detect a target object.

[0040] Figure 6 This is a schematic structural diagram of a piezoelectric device vibrating under the drive of an alternating voltage to change the morphology of a transparent cover plate in one embodiment of the present disclosure.

[0041] Figure 7 The figure is a schematic diagram of the relative position structure of a piezoelectric device and a light-transmitting cover plate in one embodiment of the present disclosure.

[0042] Figure 8 The figure is a schematic diagram of the relative position structure of a piezoelectric device and a light-transmitting cover plate in one embodiment of the present disclosure.

[0043] Fig. 9 The figure is a schematic diagram of the relative position structure of a piezoelectric device and a light-transmitting cover plate in one embodiment of the present disclosure.

[0044] Fig.10 The figure is a schematic diagram of the relative position structure of a piezoelectric device and a light-transmitting cover plate in one embodiment of the present disclosure.

[0045] Fig.11 The figure is a schematic diagram of the relative position structure of a piezoelectric device and a light-transmitting cover plate in one embodiment of the present disclosure.

[0046] Fig.12 It is a schematic diagram of the structure of a photosensitive component in one embodiment of the present disclosure.

[0047] Fig.13 The figure is the morphology of the light-transmitting cover plate when the piezoelectric device is driven by an alternating voltage in one embodiment of the present disclosure.

[0048] Fig.14 The figure is the morphology of the light-transmitting cover plate when the piezoelectric device is driven by an alternating voltage in one embodiment of the present disclosure.

[0049] Fig.15 The figure is the morphology of the light-transmitting cover plate when the piezoelectric device is driven by an alternating voltage in one embodiment of the present disclosure.

[0050] Fig.16The figure is the morphology of the light-transmitting cover plate when the piezoelectric device is driven by an alternating voltage in one embodiment of the present disclosure.

[0051] Fig.17 The figure is the morphology of the light-transmitting cover plate when the piezoelectric device is driven by an alternating voltage in one embodiment of the present disclosure.

[0052] Fig.18 This is a schematic diagram of the bottom-up structure of a piezoelectric device in one embodiment of the present disclosure, wherein the collimator is not shown.

[0053] Fig.19 This is a schematic diagram of the distribution of piezoelectric devices in one embodiment of the present disclosure.

[0054] Fig. 20 This is a schematic diagram of the structure of a photosensitive component in one embodiment of the present disclosure.

[0055] Description of reference numerals:

[0056] 010, microlens; 020, photosensitive element; 030, photosensitive drive circuit; 040, conductive structure; 100, light-transmitting cover; 101, first edge; 102, second edge; 103, third edge; 104, fourth edge; 110, first surface; 120, second surface; 200, piezoelectric device; 201, piezoelectric device group; 210, first electrode layer; 220, piezoelectric layer; 230, second electrode layer; 300, light sensor; 400, collimator; 410, shading substrate; 420, light-transmitting hole; 500, optical adhesive layer; 600, photosensitive drive circuit; 700, conductive structure; 800, target; A, first area; B, second area; C, first direction; D, second direction. DETAILED DESCRIPTION

[0057] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0058] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as according to the orientation of the examples described in the drawings. It is understood that if the device of the illustration is turned upside down, the component described as "upper" will become the component "lower". When a structure is "on" other structures, it may mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0059] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used merely as labels and are not intended to limit the quantity of their objects.

[0060] In the prior art, see Figure 1 , the infrared detection device may include a photosensitive element 020 and a microlens 010 located on one side of the photosensitive element 020, and a photosensitive driving circuit 030 for driving each photosensitive element 020, and the photosensitive driving circuit 030 is connected to each photosensitive element 020 through a conductive structure 040. However, the microlens 010 has a fixed radius of curvature, resulting in the infrared detection device being able to sense targets only at a specific distance. For example, in the prior art, an infrared fingerprint recognition chip may include a stacked microlens layer and an infrared sensor layer, and the radius of curvature of each microlens in the microlens layer is fixed. Only when a finger presses on the surface of the infrared fingerprint recognition chip, the microlens can converge the infrared radiated by the finger to the infrared sensor, so that the fingerprint recognition chip can detect the fingerprint on the finger. When the finger does not press on the surface of the infrared fingerprint recognition chip, for example, when it is in a suspended state, the infrared reflected by the finger cannot be converged to the infrared sensor, so that the infrared fingerprint recognition chip cannot detect the fingerprint on the finger. In other words, in the prior art, the infrared fingerprint recognition chip can only realize contact fingerprint recognition, but cannot realize contactless fingerprint recognition.

[0061] The present disclosure provides a photosensitive component, see Figure 2 The photosensitive component includes a light-transmitting cover plate 100, a piezoelectric device 200 and a light sensor 300. The piezoelectric device 200 is disposed on one side of the light-transmitting cover plate 100, and the light sensor 300 is disposed on one side of the light-transmitting cover plate 100.

[0062] When the piezoelectric device 200 is driven by an AC voltage, the piezoelectric device 200 will vibrate and transmit the vibration to the light-transmitting cover plate 100, so that the light-transmitting cover plate 100 also vibrates. Figures 4 to 6 , the transparent cover plate 100 is deformed and undulated during the vibration wave transmission process, thereby presenting a light convergence effect similar to that of a microlens. In this way, the photosensitive component of the present invention can realize the function of converging light to the light sensor 300. In addition, when the frequency of the AC voltage driving the piezoelectric device 200 or the voltage magnitude of the AC voltage is changed, the vibration state of the piezoelectric device 200 will change, thereby changing the vibration state of the transparent cover plate 100, and changing the degree of undulation of the transparent cover plate 100, thereby enabling the transparent cover plate 100 to achieve a zoom function. In this way, when the distance between the target object 800 and the photosensitive component changes, the frequency or voltage magnitude of the AC voltage driving the piezoelectric device can be adjusted so that the light from the target object 800 can still be converged to the light sensor; in other words, the photosensitive component of the present invention can sense the target object 800 at different distances, and it can perform both contact sensing and non-contact sensing.

[0063] In addition, the photosensitive component of the present invention can be focused using the transparent cover plate 100 without the need for an additional microlens array, thereby reducing the thickness and volume of the photosensitive component, which is conducive to the slimming of electronic devices based on the photosensitive component of the present invention.

[0064] Below, the structure, principle and effect of the photosensitive component provided by the present invention are further explained and illustrated in conjunction with the accompanying drawings.

[0065] See also Figure 2 , the photosensitive component may include a transparent cover plate 100. The transparent cover plate 100 has a first area A for setting the piezoelectric device 200, and a second area B for setting the light sensor 300. The shape of the transparent cover plate 100 can be set as needed, for example, it can be a square, a rectangle, a circle, an ellipse, a regular hexagon, a regular octagon or other shapes. Among them, the first area can be located on one side of the second area, or it can be located inside the second area, or it can partially overlap with the second area. In other words, the orthographic projection of the piezoelectric device 200 on the transparent cover plate 100 and the orthographic projection of the light sensor 300 on the transparent cover plate 100 may not overlap at all, or they may partially overlap with each other, or the orthographic projection of one of them is located within the orthographic projection of the other.

[0066] In one embodiment of the present disclosure, see Figures 7 to 11, the first area A can be arranged near the edge of the light-transmitting cover plate 100, and the second area B can be located on one side of the first area A. In this way, the integrity of the second area B can be improved, and the centralized arrangement of the light sensor 300 can be facilitated. Exemplarily, the light-transmitting cover plate 100 has a first edge 101 extending along a first direction C, and the first area A is arranged near the first edge 101 and penetrates the light-transmitting cover plate 100 along the first direction C. In the present disclosure, the extension direction of the first edge 101 can be defined as the first direction C, and the first direction C is parallel to the plane where the light-transmitting cover plate 100 is located. A second direction D can be defined, and the second direction D is parallel to the plane where the light-transmitting cover plate 100 is located and perpendicular to the first direction C.

[0067] In another embodiment of the present disclosure, the first area A may be located within the second area B and extend along the first direction to penetrate the light-transmitting cover plate. Fig. 20 , the orthographic projection of at least part of the piezoelectric device on the transparent cover plate overlaps at least partly with the orthographic projection of at least part of the light sensor on the transparent cover plate. Exemplarily, the first area A can be arranged near the first edge 101 of the transparent cover plate 100 and extend along the first direction; the first area A is within the range of the second area B. In this way, the piezoelectric device 200 located in the first area A and the light sensor 300 located in the second area B can overlap. Again exemplarily, see Fig.19 There are multiple first regions A, and each first region A is parallel to the first direction A; the first region A is within the range of the second region B. In this way, the piezoelectric device 200 located in the first region A and the light sensor 300 located in the second region B can overlap.

[0068] It is understandable that when the first area A overlaps with the second area B, that is, when there is at least partial overlap between the piezoelectric device 200 and the light sensor 300, the piezoelectric device 200 has good transmittance in a direction perpendicular to the transparent cover, for example, the transmittance is not less than 10%.

[0069] In one embodiment of the present disclosure, see Figures 7 to 11 , the transparent cover plate 100 is in the shape of a parallelogram, which includes a first edge 101, a second edge 102, a fourth edge 104 and a third edge 103 connected end to end in sequence. The first edge 101 and the fourth edge 104 are arranged opposite to each other and are both connected to the second edge 102 and the third edge 103. Optionally, the transparent cover plate 100 is in the shape of a rectangle; that is, the second edge 102 and the third edge 103 both extend along the second direction D.

[0070] The material of the transparent cover plate 100 can be selected from transparent organic materials or transparent inorganic materials. Of course, in other embodiments, the material of the transparent cover plate can also be a mixture of organic materials and inorganic materials, or the transparent cover plate can include stacked organic material layers and inorganic material layers, whichever is light-transmissive.

[0071] In some embodiments, the transparent cover plate 100 may be a rigid cover plate rather than a bendable cover plate. In this way, the transparent cover plate 100 can better conduct the vibration applied by the piezoelectric device 200 and reduce the energy loss of the vibration during the conduction process. For example, the transparent cover plate 100 may be a glass cover plate. Furthermore, the transparent cover plate may be a transparent cover plate with multiple natural frequencies. In this way, the frequency of the AC voltage driving the piezoelectric device 200 can be adjusted so that the vibration frequency of the electric device 200 is equal to or close to a certain order of the natural frequency of the transparent cover plate, so that the transparent cover plate resonates to generate a stable and large amplitude vibration, and transmits the vibration through a transverse wave. When the frequency of the AC voltage is adjusted, the vibration frequency of the piezoelectric device 200 can be changed to be equal to or close to another order of the natural frequency of the transparent cover plate, so that the transparent cover plate 100 vibrates at another order of the natural frequency.

[0072] In some embodiments, the thickness of the light-transmitting cover plate 100 may be in the range of 10 microns to 10 millimeters. In this way, it can be ensured that the light-transmitting cover plate 100 has sufficient mechanical properties to transmit vibration waves. In addition, in the related art, light-transmitting plates of this thickness are also commonly used materials. For example, the thickness of the glass cover plate of a mobile phone screen is about 0.5 millimeters. The light-transmitting cover plate 100 disclosed in the present invention can utilize existing light-transmitting plates to reduce costs. Furthermore, the thickness of the light-transmitting cover plate 100 may be in the range of 0.1 mm to 1 mm. Exemplarily, the light-transmitting cover plate 100 may be a glass cover plate with a thickness of 0.3 mm to 0.5 mm.

[0073] See also Figures 2 to 5 The piezoelectric device 200 is disposed on one side of the transparent cover plate 100 for applying vibration to the transparent cover plate 100. Exemplarily, the transparent cover plate 100 has a first surface 110 and a second surface 120 disposed opposite to each other; the piezoelectric device 200 can be disposed on the first surface 110 of the transparent cover plate 100.

[0074] See also Figure 4 and Figure 5, when the piezoelectric device 200 is in working state, its vibration direction can be perpendicular to the plane where the light-transmitting cover plate 100 is located. In this way, under the drive of the piezoelectric device 200, transverse waves can be generated and transmitted on the light-transmitting cover plate 100, thereby ensuring that the surface of the light-transmitting cover plate 100 is undulating, achieving a light-converging effect similar to a microlens. During the working process of the photosensitive component provided by the present disclosure, the frequency or voltage of the AC voltage of the driving voltage device can be adjusted in real time, thereby adjusting the light-converging effect that can be achieved by the light-transmitting cover plate in real time, achieving a function similar to real-time zoom.

[0075] See also Figure 3 In one embodiment of the present disclosure, the piezoelectric device 200 may include a first electrode layer 210, a piezoelectric layer 220, and a second electrode layer 230 stacked sequentially on one side of the transparent cover plate 100. When an AC voltage is applied between the first electrode layer 210 and the second electrode layer 230, the piezoelectric layer 220 will produce periodic deformation, thereby transmitting vibration to the transparent cover plate 100.

[0076] Optionally, the material of the piezoelectric layer 220 may be an inorganic piezoelectric material, an organic piezoelectric material or a composite piezoelectric material. In one embodiment of the present disclosure, the material of the piezoelectric layer 220 may include one of PZT (lead zirconate titanate piezoelectric ceramics), PVDF (polyvinylidene fluoride), ZnO (zinc oxide), etc.

[0077] Optionally, the materials of the first electrode layer 210 and the second electrode layer 230 can be selected from conductive materials, for example, metals, conductive metal oxides, conductive polymers, conductive composite materials or combinations thereof can be selected. Exemplarily, the metal can be selected from platinum, gold, silver, aluminum, chromium, nickel, copper, molybdenum, titanium, magnesium, calcium, barium, sodium, palladium, iron, manganese or combinations thereof. Exemplarily, the conductive metal oxide can be selected from indium oxide, tin oxide, indium tin oxide, fluorine-doped tin oxide, aluminum-doped zinc oxide, gallium-doped zinc oxide or combinations thereof. Exemplarily, the conductive polymer can be selected from polyaniline, polypyrrole, polythiophene, polyacetylene, poly(3,4-ethylenedioxythiophene) / polystyrene sulfonic acid (PEDOT / PSS) or combinations thereof, and dopants such as acids (such as hydrochloric acid, sulfuric acid, sulfonic acid, etc.), Lewis acids (such as phosphorus fluoride, arsenic fluoride, ferric chloride, etc.), halogens, and alkali metals can also be added to the conductive polymer. Exemplarily, the conductive composite material may be selected from conductive composite materials dispersed with carbon black, graphite powder, metal particles, etc. In one embodiment of the present disclosure, the material of the first electrode layer 210 and the second electrode layer 230 may include one of Mo (molybdenum), Pt (platinum), and ITO (indium tin oxide).

[0078] Optionally, the piezoelectric device 200 may be prepared by the following method.

[0079] In step S110 , the material of the first electrode layer 210 is deposited on the first surface 110 of the transparent cover plate 100 to form a first electrode material layer.

[0080] Step S120, forming a piezoelectric material layer on the surface of the first electrode material layer away from the transparent cover plate 100, the material of the piezoelectric material layer is the same as the piezoelectric layer 220. Then, the piezoelectric material layer is polarized. Optionally, the piezoelectric material layer can be formed by one of the methods such as PECVD (Plasma Enhanced Chemical Vapor Deposition), film spinning, coating, etc.

[0081] Step S130 , depositing the material of the second electrode layer 230 on the surface of the piezoelectric material layer away from the transparent cover plate 100 to form a second electrode material layer.

[0082] Step S140, the second electrode material layer, the piezoelectric material layer and the first electrode material layer are patterned in sequence to form the second electrode layer 230, the piezoelectric layer 220 and the first electrode layer 210 respectively. Further, a photolithography process can be used to pattern each film layer. In the present disclosure, the photolithography process can include steps such as coating photoresist, photoresist exposure, photoresist development, etching the target film layer, and removing the photoresist.

[0083] Optionally, the thickness of the piezoelectric device 200 may be no greater than 10 microns, so as to reduce the thickness of the photosensitive component of the present disclosure, overcome the defects of the photosensitive component being thick and wasting space in the prior art, and facilitate the thinning of electronic devices using the photosensitive component. In one embodiment of the present disclosure, the thickness of the piezoelectric device 200 may be in the range of 0.1 microns to 10 microns. Exemplarily, the thickness of the piezoelectric device 200 may be in the range of 1 micron to 2 microns.

[0084] Optionally, the piezoelectric devices are arranged into at least one piezoelectric device group 201 extending along the first direction, and any one of the piezoelectric device groups 201 includes at least one piezoelectric device 200. In other words, the light-transmitting cover plate may include at least one first area A, and any one of the first areas A extends along the first direction and penetrates the light-transmitting cover plate. At least one piezoelectric device may be provided in any one of the first areas A. In one embodiment of the present disclosure, the number of piezoelectric device groups is one, and the vibration frequency or vibration amplitude of the piezoelectric device can be adjusted by changing the frequency of the AC voltage or the amplitude of the AC voltage, thereby changing the vibration frequency or vibration amplitude of the light-transmitting cover plate, and changing the light gathering ability of the light-transmitting cover plate at a specific moment. In another embodiment of the present disclosure, the number of piezoelectric device groups is multiple, and the vibration frequency, vibration amplitude, or vibration energy that the piezoelectric device group can load to the light-transmitting cover plate can be adjusted by changing the frequency of the AC voltage, changing the amplitude of the AC voltage, or changing the number of working piezoelectric device groups, thereby changing the vibration frequency or vibration amplitude of the light-transmitting cover plate, and changing the light gathering ability of the light-transmitting cover plate at a specific moment. It can be understood that the more the number of working piezoelectric device groups, the greater the energy that the piezoelectric device can load to the light-transmitting cover plate when vibrating, which can increase the amplitude of the light-transmitting cover plate.

[0085] See also Figures 7 to 11 , in the first area A, the number of piezoelectric devices 200 may be one or more. Optionally, when the number of piezoelectric devices 200 is multiple, the multiple piezoelectric devices 200 are arranged in a straight line. In other words, when the number of piezoelectric devices 200 in a piezoelectric device group 201 is multiple, the multiple piezoelectric devices 200 are arranged in a straight line along the first direction. Optionally, when the number of piezoelectric devices 200 is one, the piezoelectric device 200 may extend along a straight line and be in a long strip shape. In other words, when the number of piezoelectric devices 200 in a piezoelectric device group is one, the piezoelectric device 200 may extend along a straight line and be in a long strip shape.

[0086] In any one of the piezoelectric device groups, the piezoelectric device extends to the edge of the light-transmitting cover plate along the first direction, or there is a gap between the two ends of any one of the piezoelectric devices in the first direction and the edge of the light-transmitting cover plate. For example, in one embodiment of the present disclosure, in at least one of the piezoelectric device groups, the piezoelectric device extends to the edge of the light-transmitting cover plate along the first direction. For another example, in at least one of the piezoelectric device groups, there is a gap between the two ends of any one of the piezoelectric devices in the first direction and the edge of the light-transmitting cover plate.

[0087] For example, see Figure 7 and Figure 8The number of the piezoelectric device 200 is one, and the piezoelectric device 200 extends in a long strip shape along the first direction C. The piezoelectric device 200 may extend to the edge of the transparent cover plate 100 , or may not extend to the edge of the transparent cover plate 100 .

[0088] For example, in one embodiment of the present disclosure, see Figure 8 The piezoelectric device 200 extends along the first direction C and penetrates the first region A along the first direction C. In a specific example, the extension direction of the piezoelectric device 200 is consistent with the extension direction of the first edge 101 , and both ends of the piezoelectric device 200 are flush with the second edge 102 and the third edge 103 , respectively.

[0089] For example, in another embodiment of the present disclosure, see Figure 7 , the piezoelectric device 200 extends along the first direction C, and there is a gap between the piezoelectric device 200 and the two ends of the first region A in the first direction C. In a specific example, the extension direction of the piezoelectric device 200 is consistent with the extension direction of the first edge 101, and the two ends of the piezoelectric device 200 extend to positions close to the second edge 102 and the third edge 103 respectively, but there is a gap between the piezoelectric device 200 and the second edge 102 and the third edge 103.

[0090] In some other embodiments of the present disclosure, in at least one piezoelectric device group 201, there are multiple piezoelectric devices 200, and the multiple piezoelectric devices 200 are arranged in sequence along the first direction C. In this way, the multiple piezoelectric devices 200 can work synchronously and apply vibration to the transparent cover plate 100. The shape of the piezoelectric device 200 is not limited to a long strip, but can also be a square, a rectangle (such as Fig. 9 Examples), diamond, circle (such as Fig.10 Examples), ellipse, pentagon, hexagon (such as Fig.11 Optionally, the shapes of the plurality of piezoelectric devices 200 may be the same or different.

[0091] Optionally, when the photosensitive component has multiple piezoelectric device groups, the number, shape, size, etc. of the piezoelectric devices 200 included in any two piezoelectric device groups may be the same or different. In one embodiment of the present disclosure, the number, shape, size, etc. of the piezoelectric devices 200 included in any two piezoelectric device groups are the same.

[0092] In some embodiments, the size of the piezoelectric device 200 in the second direction D may be in the range of 1 to 10 mm, so as to effectively apply vibration of sufficient intensity to the transparent cover plate 100. For example, the size of the piezoelectric device 200 in the second direction D may be in the range of 1 to 5 mm.

[0093] See also Figure 6When the transparent cover plate 100 vibrates and then presents an undulating shape under the control of the piezoelectric device 200, the transparent cover plate 100 has a vibration reference plane G, which is substantially consistent with the plane where the transparent cover plate 100 is located when it is not vibrating. At a specific moment, part of the transparent cover plate 100 is located below the vibration reference plane G and another part of the transparent cover plate is located above the vibration reference plane G. In the present disclosure, the direction from the transparent cover plate 100 toward the light sensor 300 is defined as the downward direction F, and the direction from the light sensor 300 toward the transparent cover plate 100 is defined as the upward direction E. See Figures 4 to 6 , the portion of the light-transmitting cover plate 100 located above the vibration reference plane G is convex, which has a light-converging effect and is equivalent to a microlens in shape and function. The portion of the light-transmitting cover plate 100 located above the vibration reference plane G, the size along the second direction D can be defined as the opening size D. It can be understood that when the frequency of the AC voltage loaded on the piezoelectric device 200 is adjusted, the opening size D can change. It can also be understood that when the voltage value of the AC voltage is adjusted without adjusting the frequency of the AC voltage, the opening size D of the light-transmitting cover plate may not change but the amplitude of its vibration will change, which will also cause the degree of fluctuation of the light-transmitting cover plate to be different, thereby achieving a similar zoom effect.

[0094] The present disclosure also simulates and tests the morphology of the transparent cover plate at a specific moment when the piezoelectric device is driven by AC voltages of different frequencies; in the simulation test, the number of the piezoelectric device is one and it extends along the first direction and penetrates the transparent cover plate in the first direction. Fig.13 This is the morphology of the light-transmitting cover when the frequency of the AC voltage is 45.318 kHz. Fig.14 This is the morphology of the light-transmitting cover when the frequency of the AC voltage is 45.052kHz. Fig.15 This is the morphology of the light-transmitting cover when the frequency of the AC voltage is 96.498 kHz. Fig.16 This is the morphology of the transparent cover when the frequency of the AC voltage is 217.19 kHz. Fig.17 This is the morphology of the transparent cover when the frequency of the AC voltage is 285.4kHz.

[0095] according to Figures 13 to 17 From the morphology of the transparent cover plate, it can be found that when the frequency of the AC voltage is changed, the opening size of the transparent cover plate changes. Specifically, when the frequency of the AC voltage is increased, the opening size of the transparent cover plate decreases. This is because the deformation of the transparent cover plate is transmitting transverse waves, and the period of the transverse wave is related to the frequency and propagation speed. When the frequency of the transverse wave increases, the period of the transverse wave decreases.

[0096] Further observation Figures 13 to 17It can be found that in most areas of the transparent cover plate, especially in areas outside the edge of the transparent cover plate, the morphology of the transparent cover plate is regular and uniform. Fig.18 In the photosensitive component, there may be a gap between each light sensor 300 and the edge of the transparent cover plate 100, so as to ensure that each light sensor is in a uniform environment.

[0097] Further observation Figures 13 to 17 It can be found that when the frequency of the AC voltage changes, the undulating morphology generated on the transparent cover plate may be different. Figures 13 to 16 In the morphology of the transparent cover plate shown, the transparent cover plate can form linear stripe protrusions arranged side by side, so that the transparent cover plate can have a morphology similar to a cylindrical lens array. Fig.17 In the morphology of the light-transmitting cover plate shown, the light-transmitting cover plate can form spherical protrusions distributed in an array, so that the light-transmitting cover plate can have a morphology similar to a spherical lens array.

[0098] The photosensitive component disclosed in the present invention has a reference frequency and a reference size Dref corresponding to the reference frequency. The reference frequency is the frequency of the AC voltage that can make the vibration frequency of the piezoelectric device the first-order natural frequency of the transparent cover. When the frequency of the driving voltage that drives the piezoelectric device 200 is the reference frequency, the vibration frequency of the piezoelectric device is the first-order natural frequency of the transparent cover, which can make the transparent cover vibrate at its first-order natural frequency and produce resonance; half of the wavelength of the transverse wave transmitted by the resonance is the reference size of the present invention. In other words, the reference size Dref is half of the wavelength of the transverse wave transmitted when the transparent cover vibrates at its first-order natural frequency. When the transparent cover vibrates at its first-order natural frequency, the opening size D of the transparent cover is the reference size Dref.

[0099] In one embodiment of the present disclosure, the light-transmitting cover plate has a first edge extending along the first direction; the distance between the center of the piezoelectric device closest to the first edge and the first edge is not less than half of the reference size. In this way, the vibration generated by the piezoelectric device can be effectively and stably loaded to the light-transmitting cover plate.

[0100] In one embodiment of the present disclosure, the number of the piezoelectric device groups is multiple; the distance between the axes of two adjacent piezoelectric device groups along the first direction is in the range of (n+0.8)*Dref to (n+1.2)*Dref; wherein n is a natural number. In this way, the multiple piezoelectric device groups can cooperate with each other to jointly apply vibration to the transparent cover plate, so that the vibration amplitude of the transparent cover plate is larger, thereby changing the light gathering ability of the transparent cover plate at a specific moment. Furthermore, the distance between the axes of two adjacent piezoelectric device groups along the first direction is (n+1)*Dref. In this way, each piezoelectric device group can achieve the most efficient coordination. It can be understood that when the two piezoelectric device groups contained in the adjacent piezoelectric device groups change, the value of n can be the same or different. In other words, each piezoelectric device group can be arranged at equal intervals or at unequal intervals in the second direction. Exemplarily, if the light-transmitting cover is provided with five piezoelectric device groups, the distance between the axis of the second piezoelectric device group in the first direction and the axis of the third piezoelectric device group in the first direction can be Dref, the distance between the axis of the third piezoelectric device group in the first direction and the axis of the fourth piezoelectric device group in the first direction can be 3Dref, and the distance between the axis of the fourth piezoelectric device group in the first direction and the axis of the fifth piezoelectric device group in the first direction can be 2Dref.

[0101] In one embodiment of the present disclosure, there are multiple piezoelectric device groups; the distances between the axes of any two adjacent piezoelectric device groups along the first direction are the same and are both (n+1)*Dref.

[0102] In one embodiment of the present disclosure, the distance between the axis of any one of the piezoelectric device groups along the first direction and the first edge is in the range of (n+0.3)*Dref to (n+0.7)*Dref; wherein n is a natural number. In this way, multiple piezoelectric device groups can cooperate with each other to jointly apply vibration to the light-transmitting cover plate, so that the vibration amplitude of the light-transmitting cover plate is larger, thereby changing the light-gathering ability of the light-transmitting cover plate at a specific moment. It can be understood that for different piezoelectric device groups, the corresponding values ​​of n are different. Furthermore, the distance between the axis of any one of the piezoelectric device groups along the first direction and the first edge is (n+0.5)*Dref.

[0103] In one embodiment of the present disclosure, the size of the piezoelectric device in the second direction is not greater than a reference size; the reference size is half the wavelength of the vibration wave transmitted when the transparent cover plate vibrates at its first-order natural frequency.

[0104] In another embodiment of the present disclosure, the photosensitive component of the present disclosure can keep the frequency of the AC voltage driving the piezoelectric device unchanged during operation, and adjust the voltage value of the AC voltage to adjust the fluctuation degree of the transparent cover plate to achieve a similar zoom effect. Exemplarily, the photosensitive component of the present disclosure can keep the frequency of the AC voltage driving the piezoelectric device at the reference frequency during operation, and the opening size of the transparent cover plate 100 is kept at the reference opening size Dref. By adjusting the voltage value of the AC voltage, the convexity of the transparent cover plate is increased or decreased, thereby achieving a similar zoom effect.

[0105] In the photosensitive assembly of the present disclosure, the light sensor 300 is located on one side of the light-transmitting cover plate 100 for sensing light. The light sensor 300 can be located on any side of the light-transmitting cover plate 100, for example, on a side of the first surface 110 of the light-transmitting cover plate 100 away from the second surface 120, or on a side of the second surface 120 of the light-transmitting cover plate 100 away from the first surface 110.

[0106] In one embodiment of the present disclosure, see Figure 2 The light sensor 300 and the piezoelectric device 200 are located on the same side of the transparent cover plate 100, so as to further reduce the thickness and volume of the photosensitive component, which is conducive to the lightweight and thinning of electronic devices using the photosensitive component.

[0107] Alternatively, see Fig.12 The photosensitive assembly of the present disclosure may further include a photosensitive driving circuit 600, which may be connected to each light sensor 300 to receive a detection signal generated by each light sensor 300 in response to an external light signal. In one embodiment of the present disclosure, the photosensitive driving circuit 600 is connected to an end of the light sensor 300 away from the transparent cover plate 100, for example, by a conductive structure 700 such as solder.

[0108] Optionally, the light sensor 300 may be an infrared light sensor 300, a visible light sensor 300, an ultraviolet light sensor 300 or other types of light sensors 300, whichever can sense light. When the photosensitive component has multiple light sensors 300, each light sensor 300 may be the same light sensor 300 or may be multiple different light sensors 300.

[0109] Illustratively, in one embodiment of the present disclosure, there are multiple light sensors 300 distributed in an array, and each light sensor 300 is an infrared light sensor 300 for sensing infrared light.

[0110] It is understandable that the detection signal provided by each of the array-distributed light sensors 300 can be used to generate a detection image, which can be directly used as a display image displayed by the electronic device, or can be displayed after further correction / rendering / modification by the electronic device, or can be used as basic information for feature recognition by the electronic device, or can be stored or processed as data information. For example, in one embodiment of the present disclosure, the array-distributed light sensors 300 can be used as part of a camera assembly, and the detection signal provided by them can be used to generate a photo. For another example, in another embodiment of the present disclosure, the array-distributed light sensors 300 can be used as part of an infrared fingerprint recognition chip, and the detection signal provided by them can generate a fingerprint image, which is used for feature recognition for fingerprint recognition or matching.

[0111] Alternatively, see Figure 2 The photosensitive component may further include a collimator 400, which is located between the light sensor 300 and the transparent cover 100. The collimator 400 is used to shield interfering light, so that the light sensor 300 can only receive light with a specific incident angle, thereby improving the accuracy of the light sensing result.

[0112] Furthermore, the collimator 400 has a light shielding portion and a light-transmitting portion in the light shielding portion, and the light-transmitting portion can be a light-transmitting hole 420 that penetrates the light shielding portion in a direction perpendicular to the plane where the light-transmitting cover plate 100 is located, or can be a transparent filling portion that penetrates the light shielding portion in a direction perpendicular to the plane where the light-transmitting cover plate 100 is located. The light-transmitting portions of the collimator 400 are arranged in a one-to-one correspondence with the light sensors 300, and the orthographic projection of the light sensor 300 on the light-transmitting cover plate 100 is at least partially overlapped with the orthographic projection of the corresponding light-transmitting portion on the light-transmitting cover plate 100.

[0113] In one embodiment of the present disclosure, see Figure 2 , the number of light sensors 300 is multiple and arranged in an array; the collimator 400 includes a light shielding substrate 410, and the light shielding substrate 410 is provided with multiple light-transmitting holes 420 corresponding to each light sensor 300; the orthographic projection of the light sensor 300 on the light shielding substrate 410 at least partially overlaps with the corresponding light-transmitting hole 420. In this embodiment, the light shielding substrate 410, as the light shielding part of the collimator 400, can filter out the light irradiated to the light sensor 300 at a large angle.

[0114] Alternatively, see Figure 2 The photosensitive assembly of the present disclosure may further include an optical adhesive layer 500, and the optical adhesive layer 500 is located between the collimator 400 and the light-transmitting cover plate 100. The collimator 400 is connected to the light-transmitting cover plate 100 through the optical adhesive layer 500.

[0115] In one embodiment of the present disclosure, the refractive index of the optical adhesive layer 500 is the same as the refractive index of the transparent cover plate 100. In this way, during the vibration of the transparent cover plate 100, although the contact surface between the optical adhesive layer 500 and the transparent cover plate 100 is deformed, since the refractive index between the transparent cover plate 100 and the optical adhesive layer 500 is the same, the deformation of the contact surface will not cause a change in the optical path. Of course, in other embodiments, the refractive index of the optical adhesive layer 500 and the refractive index of the transparent cover plate 100 can be kept close but not absolutely the same, for example, the difference in refractive index between the two can be within 0.5.

[0116] Optionally, when preparing the photosensitive component of the present disclosure, the piezoelectric device 200 can be first prepared on the transparent cover plate 100, and then the collimator 400 can be bonded to the transparent cover plate 100 through the optical adhesive layer 500, and finally the light sensor 300 can be bonded to the side of the collimator 400 away from the transparent cover plate 100.

[0117] The disclosed embodiment also provides an electronic device, which includes any one of the photosensitive components described in the above photosensitive component embodiments. The electronic device can be a fingerprint recognition chip, an infrared touch panel, an infrared camera, or other types of electronic modules, or a smart phone, a tablet computer, a smart watch, or other types of terminal products. Since the electronic device has any one of the photosensitive components described in the above photosensitive component embodiments, it has the same beneficial effects, and the disclosure will not be repeated here.

Claims

1. A photosensitive component, comprising: Translucent cover plate; A piezoelectric device is disposed on one side of the light-transmitting cover plate; A light sensor, disposed on one side of the light-transmitting cover plate; The piezoelectric devices are arranged into at least one piezoelectric device group extending along a first direction, and any one of the piezoelectric device groups includes at least one piezoelectric device; The transparent cover plate has a first edge extending along the first direction; the distance between the center of the piezoelectric device closest to the first edge and the first edge is not less than half of a reference size; the reference size is half of the wavelength of a transverse wave transmitted when the transparent cover plate vibrates at its first-order natural frequency.

2. The photosensitive component according to claim 1, wherein: The light-transmitting cover plate is a glass cover plate.

3. The photosensitive component according to claim 1, wherein: The thickness of the light-transmitting cover plate is 0.01-10 mm.

4. The photosensitive component according to claim 1, wherein: In at least one of the piezoelectric device groups, the piezoelectric device extends along the first direction to an edge of the light-transmitting cover plate.

5. The photosensitive component according to claim 1, wherein: In at least one of the piezoelectric device groups, there is a gap between two ends of any one of the piezoelectric devices in the first direction and an edge of the light-transmitting cover plate.

6. The photosensitive component according to claim 1, wherein: In at least one of the piezoelectric device groups, there are multiple piezoelectric devices, and the multiple piezoelectric devices are arranged in sequence along the first direction.

7. The photosensitive component according to claim 1, wherein: The number of the piezoelectric device groups is multiple; the distance between the axes of two adjacent piezoelectric device groups along the first direction is Within the range of; wherein, n is a natural number; Dref is the reference size.

8. The photosensitive component according to claim 1, wherein: The light-transmitting cover plate has a first edge extending along the first direction; the number of the piezoelectric device groups is multiple; The distance between the axis of any one of the piezoelectric device groups along the first direction and the first edge is In the range of; wherein, n is a natural number; Dref is a reference size, the reference size being half the wavelength of the transverse wave transmitted when the light-transmitting cover plate vibrates at its first-order natural frequency.

9. The photosensitive component according to claim 1, wherein: The size of the piezoelectric device in the second direction is 1-10 mm, and the second direction is parallel to the plane where the light-transmitting cover plate is located and perpendicular to the first direction.

10. The photosensitive component according to claim 1, wherein: The size of the piezoelectric device in the second direction is not greater than a reference size; the reference size is half the wavelength of the vibration wave transmitted when the light-transmitting cover plate vibrates at its first-order natural frequency; The second direction is parallel to the plane where the light-transmitting cover plate is located and perpendicular to the first direction.

11. The photosensitive component according to claim 1, wherein: The orthographic projection of the piezoelectric device on the light-transmitting cover plate does not overlap with the orthographic projection of the light sensor on the light-transmitting cover plate.

12. The photosensitive component according to claim 1, wherein: In a direction perpendicular to the light-transmitting cover plate, the light transmittance of the piezoelectric device is not less than 10%; An orthographic projection of at least part of the piezoelectric device on the light-transmitting cover plate at least partially overlaps with an orthographic projection of at least part of the light sensor on the light-transmitting cover plate.

13. The photosensitive component according to claim 1, wherein: The photosensitive component also includes a collimator, and the collimator is located between the light sensor and the light-transmitting cover plate.

14. The photosensitive component according to claim 13, wherein: The number of the light sensors is multiple and distributed in an array; The collimator comprises a light-shielding substrate, and the light-shielding substrate is provided with a plurality of light-transmitting holes which are arranged one by one in correspondence with each of the light sensors; the orthographic projection of the light sensor on the light-shielding substrate at least partially overlaps with the corresponding light-transmitting hole.

15. The photosensitive component according to claim 13, wherein: The collimator is connected to the light-transmitting cover plate through an optical adhesive layer.

16. The photosensitive component according to claim 15, wherein: The refractive index of the optical adhesive layer is the same as the refractive index of the light-transmitting cover plate.

17. The photosensitive component according to claim 1, wherein: Along a direction perpendicular to the light-transmitting cover plate, the thickness of the piezoelectric device is 0.1-10 microns.

18. The photosensitive component according to claim 1, wherein: The light sensor and the piezoelectric device are arranged on the same side of the light-transmitting cover plate.

19. An electronic device comprising the photosensitive component according to any one of claims 1 to 18.

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