WO2019033347A1

WO2019033347A1 - Photosensitive apparatus and electronic device

Info

Publication number: WO2019033347A1
Application number: PCT/CN2017/097907
Authority: WO
Inventors: 李问杰
Original assignee: 深圳信炜科技有限公司
Priority date: 2017-08-17
Filing date: 2017-08-17
Publication date: 2019-02-21
Also published as: CN209708600U

Abstract

Disclosed are a photosensitive apparatus (20) and an electronic device. The photosensitive apparatus (20) comprises a photosensitive panel (200), and a filtering film (29) arranged on the photosensitive panel (200), wherein the filtering film (29) is used for filtering out light signals located beyond a pre-set wave band. The electronic device comprises the photosensitive apparatus (20).

Description

Photosensitive device and electronic device

Technical field

The utility model relates to the field of photoelectric sensing, in particular to a photosensitive device and an electronic device.

Background technique

At present, biometric information sensors, especially fingerprint recognition sensors, have gradually become the standard components of electronic products such as mobile terminals. Since the optical fingerprint recognition sensor has stronger penetration ability than the capacitive fingerprint recognition sensor, an optical fingerprint recognition module applied to the mobile terminal has been proposed. As shown in FIG. 1, the optical fingerprint recognition module includes an optical fingerprint sensor 400 and a light source 402. The optical fingerprint sensor 400 is disposed under the protective cover 401 of the mobile terminal. The light source 402 is disposed adjacent to one side of the optical fingerprint sensor 400. When the user's finger F contacts the protective cover 401, the light signal emitted by the light source 402 passes through the protective cover 401 and reaches the finger F, is reflected by the valleys and ridges of the finger F, and is received by the optical fingerprint sensor 400, and A fingerprint image of the finger F is formed.

However, the above optical fingerprint recognition module cannot obtain an accurate fingerprint image in an environment with strong interference signals, and needs to be improved.

Utility model content

The embodiments of the present invention aim to at least solve one of the technical problems existing in the prior art. To this end, the embodiments of the present invention need to provide a photosensitive device and an electronic device.

A photosensitive device according to an embodiment of the present invention includes a photosensitive panel and a filter film disposed on the photosensitive panel, wherein the filter film is configured to filter an optical signal other than a preset wavelength band.

In the embodiment of the present invention, by setting the filter film, the interference of the ambient light is eliminated, and the sensing precision of the photosensitive panel is improved.

In some embodiments, the optical signal outside the predetermined band is a long band signal in ambient light.

In some embodiments, the preset band is a band corresponding to a blue light signal or a green light signal.

In some embodiments, the photosensitive panel includes a substrate and a plurality of photosensitive cells disposed on the substrate.

In certain embodiments, the substrate is a silicon substrate, a metal substrate, a printed circuit board, or an insulating substrate.

In some embodiments, the photosensitive unit includes at least one photosensitive device, and the photosensitive device is a photosensitive device having high sensitivity to sensing an optical signal of the predetermined wavelength band. Through the selection of the photosensitive device, the photosensitive device is more sensitive to the sensing of the blue light signal and the green light signal, so the interference caused by the red light signal in the ambient light is avoided to some extent, thereby improving the sensing precision of the photosensitive module. .

In some embodiments, the filter film is formed directly on the photosensitive panel, or is formed separately on the photosensitive panel.

In some embodiments, the filter film includes a plurality of filter units corresponding to the photosensitive cells. The alignment of the filter unit and the photosensitive unit is achieved in this way, which satisfies the structural requirements of the photosensitive panel.

In some embodiments, the filter film includes a plurality of hollowed out regions, and the hollowed out regions are staggered from the photosensitive cells. The filter film including a plurality of hollow regions can be independently manufactured and meets the structural requirements of the photosensitive panel.

In certain embodiments, the photosensitive device further includes an anti-aliasing imaging element, and the anti-aliasing imaging element is disposed on the filter film. By the arrangement of the anti-aliasing imaging element, the optical signals received by the adjacent photosensitive units are prevented from being aliased, so that the photosensitive unit senses accurate biometric information and improves the sensing accuracy of the photosensitive device.

In certain embodiments, the anti-aliasing imaging element further includes a light absorbing wall that encloses a plurality of light transmissive regions.

In some embodiments, the light absorbing wall comprises a plurality of light absorbing blocks and height blocks arranged in an alternating stack. The light-absorbing wall is formed by stacking the height blocks and the light-absorbing blocks, which speeds up the process of the anti-aliasing imaging element and ensures the anti-aliasing effect of the anti-aliasing imaging element.

In certain embodiments, the height block is made of a transparent material.

In some embodiments, the anti-aliasing imaging element comprises a plurality of layers of light absorbing layers and transparent support layers arranged alternately; the light absorbing layer comprises a plurality of spaced apart light absorbing blocks; the transparent supporting layer is filled with a transparent material Forming, and filling together the interval between the light absorbing blocks; wherein the area corresponding to the interval forms the light transmitting area. By alternately stacking the light absorbing layer and the transparent supporting layer, the preparation of the anti-aliasing imaging element is made simpler, and the anti-aliasing effect of the anti-aliasing imaging element is ensured.

In certain embodiments, the thickness of each of the transparent support layers is unequal.

In certain embodiments, the thickness of the transparent support layer increases layer by layer.

By setting the thickness of the transparent supporting layer, the optical signal outside the predetermined angular range offset from the vertical direction of the transparent substrate is prevented from passing through the anti-aliasing imaging element, thereby improving the anti-aliasing effect of the anti-aliasing imaging element.

In some embodiments, the light transmissive region includes a first light transmissive region, and the first light transmissive region is evenly distributed.

In some embodiments, the light transmissive region includes a first light transmissive region and a second light transmissive region, and a cross-sectional area of the second light transmissive region is larger than a cross-sectional area of the first light transmissive region .

In some embodiments, the light transmissive region is filled with a transparent material. Filling the transparent material in the light-transmitting region not only increases the strength of the anti-aliasing imaging element, but also prevents impurities from entering the light-transmitting region and affecting the light-transmitting effect.

An embodiment of the present invention provides an electronic device including the photosensitive device of any of the above embodiments. Since the electronic device has the photosensitive device of any of the above configurations, it has all of the above-described advantageous effects of the photosensitive device.

The additional aspects and advantages of the embodiments of the invention will be set forth in part in the description in the written description

DRAWINGS

The above and/or additional aspects and advantages of the embodiments of the invention will be apparent from the

1 is a schematic diagram of an optical sensing structure applied to an electronic device in the prior art;

2 is a partial structural schematic view of a photosensitive device according to an embodiment of the present invention;

3 is a partial structural schematic view of a photosensitive device according to another embodiment of the present invention;

4 is a schematic structural view of an embodiment of the photosensitive unit shown in FIG. 3;

FIG. 5 is a schematic structural view of another embodiment of the photosensitive unit shown in FIG. 3; FIG.

6 is a partial structural schematic view of a photosensitive device according to still another embodiment of the present invention;

7 is a partial structural schematic view of a photosensitive device according to still another embodiment of the present invention;

8 is a schematic diagram of an optical signal that an anti-aliasing imaging element can pass through in a photosensitive device according to an embodiment of the present invention;

9 is a partial schematic structural view of an anti-aliasing imaging element according to an embodiment of the present invention;

10 is a partial structural schematic view of an anti-aliasing imaging element according to another embodiment of the present invention;

11 is a process of forming an anti-aliasing imaging element according to an embodiment of the present invention;

12 is a partial structural schematic view of an anti-aliasing imaging element according to still another embodiment of the present invention;

FIG. 13 is a schematic front view showing the structure of a photosensitive device applied to an electronic device according to an embodiment of the present invention; FIG.

Figure 14 is a cross-sectional structural view of the electronic device of Figure 13 taken along line I-I, in which only a partial structure of the electronic device is shown;

FIG. 15 is a schematic diagram showing the correspondence relationship between the display area of the display panel and the sensing area of the photosensitive panel according to an embodiment of the present invention.

Detailed ways

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are intended to be illustrative of the invention and are not to be construed as limiting.

In the description of the present invention, it is to be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. . Thus, features defining "first" or "second" may include one or more of the described features either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is two or more unless specifically and specifically defined otherwise. "Contact" or "touch" includes direct or indirect contact. For example, the photosensitive device disclosed hereinafter is disposed inside the electronic device, such as under the protective cover or the display screen, and the user's finger indirectly contacts the photosensitive device through the protective cover or the display screen.

In the description of the present invention, it should be noted that the terms "installation", "connected", and "connected" are to be understood broadly, and may be, for example, a fixed connection or a Disassembling the connection, or connecting integrally; may be mechanical connection, electrical connection or communication with each other; may be directly connected, or may be indirectly connected through an intermediate medium, may be internal communication of two elements or mutual interaction of two elements Role relationship. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of the specific examples are described below. Of course, they are merely examples and are not intended to limit the invention. In addition, the present invention may repeat reference numerals and/or reference numerals in different examples, which are for the purpose of simplicity and clarity, and do not in themselves indicate the relationship between the various embodiments and/or settings discussed. Moreover, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the use of other processes and/or the use of other materials.

Further, the described features, structures may be combined in one or more embodiments in any suitable manner. In the following description, numerous specific details are set forth However, those skilled in the art will appreciate that the technical solution of the present invention may be practiced without one or more of the specific details or other structures, components, and the like. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the invention.

In some embodiments, please refer to FIG. 2, which illustrates a partial structure of a photosensitive device according to an embodiment of the present invention. The photosensitive device 20 includes a photosensitive panel 200 and a filter film 29. The photosensitive panel 200 is configured to sense an optical signal from above to obtain predetermined biometric information of a target object contacting or approaching the photosensitive panel 200. The light-receiving film 29 is located on the photosensitive panel 200 for filtering optical signals other than the preset wavelength band in the optical signal from above, that is, the optical signal in the preset wavelength range can pass through the filtering film 29 and be illuminated by the photosensitive panel 200. Sensing.

The biometric information of the target object is, for example but not limited to, skin texture information such as fingerprints, palm prints, ear prints, and soles, and other biometric information such as heart rate, blood oxygen concentration, and veins. The target object, such as but not limited to a human body, may also be other suitable types of objects.

In the embodiment of the present invention, by providing the filter film 29 on the photosensitive panel 200, the interference signal at the time of performing biometric information sensing is filtered, and the sensing accuracy of the photosensitive panel 200 is improved.

Referring to FIG. 2, the photosensitive panel 200 includes a substrate 26 and a plurality of photosensitive cells 22 formed on the substrate 26. The photosensitive unit 22 is configured to receive an optical signal and convert the received optical signal into a corresponding electrical signal. The substrate 26 can include both a transparent substrate such as, but not limited to, a glass substrate, a plastic substrate, a crystal, a sapphire or the like, and a non-transparent substrate such as, but not limited to, a silicon substrate, a printed circuit board, a metal substrate. Wait. In addition, the substrate 26 may be a rigid material or a flexible material such as a flexible film. If the substrate 26 is a flexible material, the photosensitive panel 200 is not only thinner in thickness, but also applicable to an electronic device having a curved display screen.

In some embodiments, the filter film 29 is formed on the photosensitive unit 22 by evaporation, that is, the filter film 29 includes a plurality of filter units (not shown) corresponding to the photosensitive unit, which will be realized. The optical film 29 is accurately aligned with the photosensitive unit 22.

However, the filter film 29 can be separately formed into a film, and then disposed on the photosensitive panel 200 by, for example, pasting, so that the structure of the existing filter film 29 can be utilized, and the process is simple. . Moreover, the independently formed filter film structure is adapted to the structure of the photosensitive panel 200. Specifically, if the photosensitive panel 200 includes a plurality of light-transmitting regions and non-light-transmitting regions through which light signals are passed, and the photosensitive unit 22 is disposed in the non-light-transmitting regions. Then, the separately formed filter film will include a plurality of hollow regions, and the hollow regions correspond to the light-transmitting regions, that is, the hollow regions are staggered from the photosensitive cells. If the photosensitive panel 200 does not have a limitation of the light-transmitting area, the filter film 29 may be a complete filter film, and after being separately formed, it is disposed on the photosensitive panel 200.

In some embodiments, the filter film 29 is used to filter out optical signals outside of the predetermined band. The preset band may be an optical signal in ambient light, and the optical signal is a short band signal. However, the preset wavelength band may also be other signals that need to be filtered, and the filter film with different filtering effects may be set according to actual needs. For example, if the photosensitive panel 200 performs optical feature information sensing using an optical signal emitted from an independently disposed light source, and the light source emits a special When the optical signal of a predetermined wavelength is used, the filter film 29 is used to filter out the optical signal other than the specific wavelength to achieve the purpose of eliminating the interference signal.

In some embodiments, the filter film 29 is used to filter out interfering signals in ambient light. Specifically, when a target object contacts or approaches the photosensitive device 20, if ambient light is irradiated onto the finger, taking the finger as an example, since the finger has many tissue structures, such as epidermis, bone, meat, blood vessels, etc., the ambient light is Part of the light signal will penetrate the finger, and part of the light signal will be absorbed by the finger. The light signal penetrating the finger will reach the photosensitive unit 22, and the photosensitive unit 22 not only senses the light signal reflected by the target object, but also senses the light signal of the ambient light penetrating the finger, so that accurate sensing cannot be performed. . Therefore, in order to prevent the ambient light from affecting the sensing of the target object by the photosensitive unit 22, the filter film 29 is disposed in the embodiment for filtering the optical signal in the long wavelength band of the ambient light, that is, the short-band signal in the ambient light can pass. The filter film 29. The filter film 29 filters out the light signal passing through the finger in the ambient light to achieve the purpose of eliminating the interference signal of the ambient light, thereby improving the sensing accuracy of the photosensitive panel 200. It can be understood that the long-band signal here can be defined by a predetermined band range, and the predetermined band range is set to ensure that the interference signal that affects the sensing of the biometric information is filtered.

In some embodiments, the predetermined wavelength band is a wavelength band corresponding to the blue light signal, that is, the filter film 29 filters out optical signals other than the blue light signal.

In some embodiments, the predetermined band is a band corresponding to the green light signal, that is, the filter film 29 filters out the light signals other than the green light signal.

In ambient light, a target object such as a finger absorbs light signals of a long wavelength band weakly, such as a red light signal; and absorbs light signals of a short wavelength band, such as a blue light signal or a green light signal. Therefore, the filter film 29 that selects the optical signal of the wavelength band other than the blue light signal or the green light signal can greatly eliminate the interference of the ambient light and improve the sensing accuracy of the photosensitive panel 200.

In some embodiments, please refer to FIG. 3, which illustrates the structure of a photosensitive device according to another embodiment of the present invention. The photosensitive panel 200 includes a plurality of photosensitive cells 22 and scan line groups and data line groups electrically connected to the plurality of photosensitive cells 22, wherein the scan line group includes a plurality of scan lines 201, and the data line group includes a plurality of data lines 202. The plurality of photosensitive cells 22 are distributed in an array, such as a matrix distribution. Of course, it can also be distributed in other rule manners or in an irregular manner. A plurality of scanning lines 201 and a plurality of data lines 202 electrically connected to the photosensitive unit 22 are disposed to cross each other and disposed between adjacent photosensitive units 22. For example, a plurality of scanning lines G1, G2, ..., Gm are arranged at intervals in the Y direction, and a plurality of data lines S1, S2, ..., Sn are arranged at intervals in the X direction. However, the plurality of scanning lines 201 and the plurality of data lines 202 are not limited to the vertical arrangement shown in FIG. 3, and may be disposed at an angle, for example, 30°, 60°, or the like. In addition, since the scan line 201 and the data line 202 are electrically conductive, the scan line 201 and the data line 202 at the intersection position are separated by an insulating material.

It should be noted that the distribution and the number of the scan lines 201 and the data lines 202 are not limited to the above-exemplified embodiments, and the corresponding scan line groups and data lines may be correspondingly arranged according to the structure of the photosensitive unit 22. group.

In some embodiments, referring to FIG. 3, a plurality of scan lines 201 are connected to a photosensitive driving circuit 23, and a plurality of data lines 202 are connected to a signal processing circuit 25. The photosensitive driving circuit 23 is for supplying a corresponding scanning driving signal and transmitting it to the corresponding photosensitive unit 22 through the corresponding scanning line 201 to activate the photosensitive unit 22 to perform light sensing. The photosensitive driving circuit 23 is formed on the substrate 26, and of course, it can also be electrically connected to the photosensitive unit 22 through a connecting member (for example, a flexible circuit board), that is, a plurality of scanning lines 201 are connected. The signal processing circuit 25 receives an electrical signal generated by the corresponding photosensitive unit 22 performing light sensing through the data line 202, and acquires biometric information of the target object based on the electrical signal.

In some embodiments, the photosensitive device 20 including the photosensitive panel 200 includes a controller 27 for controlling the photosensitive driving circuit 23 in addition to the signal processing circuit 25 and the photosensitive driving circuit 23 described above. The timing of outputting the corresponding scan driving signal, such as, but not limited to, progressively activating the photosensitive unit 22 to perform light sensing. The controller 27 is further configured to control the signal processing circuit 25 to receive the electrical signal output by the photosensitive unit 22, and after receiving the electrical signals output by all the photosensitive units 22 that perform light sensing, generate biometric information of the target object based on the electrical signals. .

Further, the signal processing circuit 25 and the controller 27 described above may be selectively formed on the substrate 26 depending on the type of the substrate 26, or may be electrically connected to the photosensitive unit 22, for example, by a connector (for example, a flexible circuit board). For example, when the substrate 26 is a silicon substrate, the signal processing circuit 25 and the controller 27 may alternatively be formed on the substrate 26, and may alternatively be electrically connected to the photosensitive unit 22, for example, via a flexible circuit board; When 26 is an insulating substrate, the signal processing circuit 25 and the controller 27 need to be electrically connected to the photosensitive unit 22, for example, via a flexible circuit board.

In some embodiments, please refer to FIG. 4, which illustrates a connection structure of the photosensitive unit 22 of the embodiment with the scan line 201 and the data line 202. The photosensitive unit 22 includes a photosensitive device 220 and a switching device 222. The switching device 222 has a control terminal C and two signal terminals, for example, a first signal terminal Sn1 and a second signal terminal Sn2. The control terminal C of the switching device 222 is connected to the scan line 201. The first signal terminal Sn1 of the switching device 222 is connected to a reference signal L via the photosensitive device 220, and the second signal terminal Sn2 of the switching device 222 is connected to the data line 202.

Specifically, the above-mentioned photosensitive device 220 is, for example but not limited to, any one or several of a photodiode, a phototransistor, a photodiode, a photo resistor, and a thin film transistor. Taking a photodiode as an example, a negative voltage is applied across the photodiode. At this time, if the photodiode receives the optical signal, a photocurrent is generated in a proportional relationship with the optical signal, and the received optical signal is more intense. Large, the larger the photocurrent generated, the voltage on the negative pole of the photodiode The speed of the drop is faster. Therefore, by collecting the voltage signal on the negative electrode of the photodiode, the intensity of the light signal reflected by different parts of the target object is obtained, and the image information of the target object is obtained. It can be understood that in order to increase the photosensitive effect of the photosensitive device 220, a plurality of photosensitive devices 220 may be disposed.

Further, the switching device 222 is, for example but not limited to, any one or several of a triode, a MOS transistor, and a thin film transistor. Of course, the switching device 222 can also include other types of devices, and the number can also be two, three, and the like.

Taking the structure of the photosensitive unit 22 shown in FIG. 4 as an example, the gate of the thin film transistor TFT serves as the control terminal C of the switching device 222, and the source and the drain of the thin film transistor TFT correspond to the first signal terminal Sn1 of the switching device 222 and The second signal terminal Sn2. The gate of the thin film transistor TFT is connected to the scanning line 201, the source of the thin film transistor TFT is connected to the negative electrode of the photodiode D1, and the drain of the thin film transistor TFT is connected to the data line 202. The anode of the photodiode D1 is connected to a reference signal L, which is, for example, a ground signal or a negative voltage signal.

When the photosensitive unit 22 performs photo sensing, a driving signal is applied to the gate of the thin film transistor TFT through the scanning line 201 to drive the thin film transistor TFT to be turned on. At this time, the data line 202 is connected to a positive voltage signal. When the thin film transistor TFT is turned on, the positive voltage signal on the data line 202 is applied to the negative electrode of the photodiode D1 via the thin film transistor TFT. Since the positive electrode of the photodiode D1 is grounded, the photoelectric A reverse voltage is applied across diode D1 such that photodiode D1 is reverse biased, i.e., in operation. At this time, when an optical signal is irradiated to the photodiode D1, the reverse current of the photodiode D1 rapidly increases, thereby causing a change in current on the photodiode D1, which can be obtained from the data line 202. Since the intensity of the optical signal is larger, the reverse current generated is larger. Therefore, according to the current signal acquired on the data line 202, the intensity of the optical signal can be obtained, thereby obtaining the biometric information of the target object.

In some embodiments, the reference signal L may be a positive voltage signal, a negative voltage signal, a ground signal, or the like. As long as the electrical signal provided on the data line 202 and the reference signal L are applied across the photodiode D1 such that a reverse voltage is formed across the photodiode D1 to perform photo sensing, it is within the scope of protection defined by the present invention.

It can be understood that the connection manner of the thin film transistor TFT and the photodiode D1 in the photosensitive unit 22 is not limited to the connection mode shown in FIG. 4, and may be other connection methods. For example, as shown in FIG. 5, the connection structure of the photosensitive unit 22 of another embodiment with the scanning line 201 and the data line 202 is shown. The gate G of the thin film transistor TFT is connected to the scanning line 201, the drain D of the thin film transistor TFT is connected to the anode of the photodiode D1, and the source S of the thin film transistor TFT is connected to the data line 202. The negative terminal of the photodiode D1 is connected to a positive voltage signal.

In some embodiments, since the reflection of the light signal is different between different parts of the target object, the light signals sensed between the adjacent photosensitive cells 22 may be aliased, thereby causing the acquired biometric information to be blurred. In this regard, please refer to FIG. 6. FIG. 6 shows the structure of a photosensitive device according to another embodiment of the present invention. The utility model In an embodiment, the photosensitive device 20 further includes an anti-aliasing imaging element 28, and the anti-aliasing imaging element 28 is disposed on the filter film 29. The anti-aliasing imaging element 28 is configured to prevent aliasing of the optical signals received by the adjacent photosensitive units 22, so that the biometric information obtained by the photosensitive unit 22 after performing the light sensing is clearer, and the sensing of the photosensitive device 20 is improved. Precision.

In certain embodiments, with continued reference to FIG. 6, anti-aliasing imaging element 28 includes a light absorbing wall 281 and a plurality of light transmissive regions surrounded by a light absorbing wall. In this embodiment, the light transmitting region includes a first light transmitting region 282, and the first light transmitting region 282 is evenly distributed. The light-transmissive region includes a first light-transmitting region 282 and a second light-transmitting region 285, and the cross-sectional area of the second light-transmitting region 285 is greater than the cross-section of the first light-transmitting region 282. Cross-sectional area. The first light-transmitting region 282 is disposed corresponding to the photosensitive unit 22, and the second light-transmitting region 285 is disposed corresponding to the light-transmitting region P1 of the photosensitive panel 200.

Specifically, the light absorbing wall 281 is formed of a light absorbing material. The light absorbing material includes a metal oxide, a carbon black paint, a black ink, and the like. Wherein the metal in the metal oxide is, for example but not limited to, one of chromium (Cr), nickel (Ni), iron (Fe), tantalum (Ta), tungsten (W), titanium (Ti), molybdenum (Mo) or Several. The axial extending direction of the light transmitting region is a direction perpendicular to the photosensitive panel 200 such that an optical signal in a direction approximately perpendicular to the photosensitive panel 200 can pass through the light transmitting region in the light signal irradiated to the anti-aliasing imaging element 28. The remaining optical signals are absorbed by the light absorbing wall 281. In this way, aliasing of the optical signals received between the adjacent photosensitive cells 22 can be prevented. It should be noted that the optical signal that is approximately perpendicular to the photosensitive panel 200 includes an optical signal that is perpendicular to the photosensitive panel 200 and is offset from the vertical direction of the photosensitive panel 200 by an optical signal within a predetermined angular range. The preset angle range is within ±20°.

In some embodiments, the photosensitive unit 22 is disposed opposite to the first light-transmitting region 282, so that the light signals passing through the first light-transmitting region 282 are all received by the photosensitive unit 22, which improves the sensing of the photosensitive device 20. Precision.

In some embodiments, as shown in FIG. 8, FIG. 8 illustrates a range of optical signals that pass through the anti-aliasing imaging element 28. Due to the light absorption characteristics of the anti-aliasing imaging element 28, only the optical signal between the optical signal L1 and the optical signal L2 can pass through the first light-transmitting region 282 to the photosensitive unit 22, and the remaining optical signals are absorbed by the anti-aliasing imaging element 28. Wall 281 is absorbed. As can be seen from FIG. 7, the smaller the cross-sectional area of the first light-transmitting region 282, the smaller the range of the angle α of the light signal passing through the first light-transmitting region 282, and therefore the anti-aliasing effect of the anti-aliasing imaging element 28 is better. . As such, the anti-aliasing effect of the anti-aliasing imaging element 28 can be improved by the smaller area of the first light-transmitting region 282 provided by the anti-aliasing imaging element 28. In addition, since the cross-sectional area of the first light-transmitting region 282 of the anti-aliasing imaging element 28 is small, each photosensitive unit 22 will correspond to a plurality of light-transmitting first light-transmitting regions 282, thereby enabling the photosensitive unit 22 to sense A sufficient light signal increases the sensing accuracy of the photosensitive device 20.

Further, please refer to FIG. 9. FIG. 9 shows the structure of the anti-aliasing imaging element 28 of an embodiment of the present invention. In the embodiment of the present invention, the anti-aliasing imaging element structure shown in FIG. 7 is taken as an example, and it can be understood that The anti-aliasing imaging element shown in Figure 6 can also be implemented with reference to. The light absorbing wall 281 has a multi-layer structure, and the light absorbing wall includes a light absorbing block 281a and a height block 281b which are alternately stacked. In one embodiment, the light absorbing block 281a is formed of a light absorbing material. The light absorbing material is, for example but not limited to, a metal oxide, a carbon black paint, a black ink, or the like. Wherein the metal in the metal oxide is, for example but not limited to, one of chromium (Cr), nickel (Ni), iron (Fe), tantalum (Ta), tungsten (W), titanium (Ti), molybdenum (Mo) or Several. The height block 281b is, for example but not limited to, a transparent layer formed of a transparent material such as a translucent material, a light absorbing material, or the like.

In some embodiments, the plurality of light absorbing blocks 281a located in the same layer are spaced apart, and the area corresponding to the first space 281c between the light absorbing blocks 281a in the same layer is the first light transmitting area 282, and the light absorbing block 281a The area corresponding to the second interval 281d is the second light transmitting area 285. Further, the plurality of light absorption blocks 281a and the plurality of height blocks 281b of the same layer may be fabricated at one time. Specifically, by providing a mask, the mask is an integrally formed diaphragm, and the diaphragm forms an opening corresponding to the position of the light absorbing block 281a, and the shape and size of the opening are consistent with the shape and size of the light absorbing block 283. And the interval of the openings includes a first interval 281c and a second interval 281d. If it is the anti-aliasing imaging element shown in Fig. 6, the intervals of the openings are evenly arranged. The light absorbing block 281a and the height block 281b which are alternately disposed are sequentially vapor-deposited on a carrier by the mask, thereby forming the anti-aliasing imaging element 28.

By the arrangement of the padding block 281b, not only the process of the anti-aliasing imaging element 28 is accelerated, but also the anti-aliasing effect of the anti-aliasing imaging element 28 can be ensured by the height setting of the padding block 281b.

In some embodiments, the first transparent region 282 and the second transparent region 285 may be filled with a transparent material to increase the strength of the anti-aliasing imaging element, and impurities may be prevented from entering the first transparent region 282. And the second light-transmitting region 285 affects the light-transmitting effect. In order to ensure the light transmission effect of the first light-transmitting region 282 and the second light-transmitting region 285, a material having a relatively high light transmittance such as glass, PMMA (acrylic), PC (polycarbonate) or the like may be selected as the transparent material.

In some embodiments, please refer to FIG. 10, which illustrates the structure of an anti-aliasing imaging element of another embodiment of the present invention. In the embodiment of the present invention, the anti-aliasing imaging element structure shown in FIG. 7 is taken as an example. It can be understood that the anti-aliasing imaging element shown in FIG. 6 can also be implemented by reference. The anti-aliasing imaging element 28 is of a multi-layered structure, and the anti-aliasing imaging element 28 includes a light absorbing layer 283 and a transparent supporting layer 284 which are alternately stacked; the light absorbing layer 283 includes a plurality of spaced light absorbing blocks 283a. Further, a first interval 283b and a second interval 283c are formed between the plurality of light absorption blocks 283a. The transparent supporting layer 284 is formed by filling a transparent material, and simultaneously fills the first interval 283b and the second interval 283c between the light absorbing blocks 283a. The area corresponding to the first interval 283b is the first light transmission area 282, and the area corresponding to the second interval 283c is the second light transmission area 285. If it is the anti-aliasing imaging element shown in Fig. 6, the formed light absorbing block is uniformly disposed.

Further, please refer to FIG. 11 , which illustrates the preparation of an anti-aliasing imaging element according to an embodiment of the present invention. process. Specifically, in preparing the anti-aliasing imaging element 28, a light absorbing material is first coated on a carrier, and a portion corresponding to the first light transmitting region 282 and the second light transmitting region 285 is engraved on the light absorbing material layer. The etched, unetched portions form a plurality of light absorbing blocks 283a. The etching technique is, for example but not limited to, photolithography, X-ray etching, electron beam etching, and ion beam etching. Moreover, the etching type may include both dry etching and wet etching. Then, the etched light absorbing block 283 is coated with a transparent material, and the transparent material covers not only the plurality of light absorbing blocks 283a but also the first interval 283b and the second interval 283c between the plurality of light absorbing blocks 283a. Thereby, a transparent support layer 284 is formed. Then, a plurality of light absorbing blocks 283a are formed on the transparent supporting layer 284 in the manner in which the light absorbing layer 283 is formed, and the light absorbing layer 283 and the transparent supporting layer 284 which are alternately stacked in a plurality of layers are sequentially formed, thereby forming the anti-aliasing imaging element 28.

Further, in order to ensure the light transmissive effect of the first transparent region 282 and the second transparent region 285, the transparent material forming the transparent supporting layer 284 may be selected from materials having a large transmittance, such as glass, PMMA, and PC. (polycarbonate), epoxy resin, and the like.

In some embodiments, please refer to FIG. 12, which illustrates the structure of an anti-aliasing imaging element of another embodiment of the present invention. The anti-aliasing imaging element 28 includes a light absorbing layer 283 and a transparent support layer 284 which are alternately stacked, and the thickness of each of the transparent support layers 284 is unequal. That is, the values of the thicknesses h1, h2, and h3 in FIG. 12 are not equal. Optionally, the thickness of the transparent support layer 284 is increased layer by layer, that is, h1 < h2 < h3. In this way, it is possible to avoid that the optical signal other than ±20° from the vertical direction of the photosensitive panel 200 passes through the transparent supporting layer 284 between the light absorbing blocks 283a, thereby improving the sensing accuracy of the photosensitive device 20. It should be noted that the thickness parameter of each layer of the transparent supporting layer 284 and the width and height parameters of the light absorbing block 283a can be differently set and combined in various combinations to improve the sensing accuracy of the photosensitive device 20.

Further, an electronic device is provided, comprising the photosensitive device and the light source of any one of the above embodiments, wherein the photosensitive device utilizes an optical signal emitted by the light source to perform biometric information on a target object contacting or approaching the electronic device. Sensing. Alternatively, the electronic device further includes a display device for performing image display, such that the photosensitive device can perform biometric information sensing using the optical signal emitted by the display device. In this way, the electronic device not only realizes the image display of the electronic device, but also realizes the sensing of the biometric information of the target object contacting or approaching the electronic device. In addition, the electronic device does not need to provide an additional light source, thereby saving the cost of the electronic device.

Electronic devices such as, but not limited to, suitable types of electronic products such as consumer electronics, home electronics, vehicle-mounted electronic products, and financial terminal products. Among them, consumer electronic products such as mobile phones, tablets, notebook computers, desktop monitors, computer integrated machines. Home-based electronic products such as smart door locks, TVs, refrigerators, wearable devices, etc. Vehicle-mounted electronic products such as car navigation systems, car DVDs, etc. Financial terminal products such as ATM machines, terminals for self-service business, etc.

In some embodiments, referring to FIG. 13 and FIG. 14, FIG. 13 shows a structure of an electronic device according to an embodiment of the present invention, and FIG. 14 shows a cross-sectional structure of the electronic device shown in FIG. Moreover, FIG. 14 only shows a partial structure of the electronic device. It should be noted that the electronic device shown in FIG. 14 is exemplified by a mobile phone type mobile terminal. However, the above-mentioned photosensitive device 20 can also be applied to other suitable electronic products, and is not limited to a mobile phone type mobile terminal.

Specifically, the display device includes a display panel 100 located on the front side of the mobile terminal 3. A protective cover 300 is disposed above the display panel 100. Optionally, the screen of the display panel 100 is relatively high, for example, 80% or more. The screen ratio refers to the ratio of the actual display area 101 of the display panel 100 to the front area of the mobile terminal 3. The photosensitive device 20 (refer to FIG. 2 ) of the above embodiment includes a photosensitive panel 200 , and the photosensitive panel 200 is correspondingly disposed above the display panel 100 for sensing any position of the display area 101 contacting or approaching the display panel 100 . Predetermined biometric information of the target object. However, the photosensitive panel 200 may be correspondingly disposed below the display panel 100.

In some embodiments, the photosensitive panel 200 is configured to perform biometric information sensing of a target object at an arbitrary position within a display area of the display panel 100. Specifically, for example, referring to FIG. 2 and FIG. 15 together, the display panel 100 has a display area 101 defined by the light-emitting areas of all the display pixels 12 of the display panel 100 and an area other than the display area 101, and a non-display area 102. For the non-display area 102, the non-display area 102 is used to set a circuit such as a display driving circuit for driving the display pixels 12 or a line bonding area for connecting the flexible circuit boards. The photosensitive panel 200 has a sensing area 203 and a non-sensing area 204 defined by the sensing areas of all the photosensitive cells 22 of the photosensitive panel 200, and the area other than the sensing area 203 is the non-sensing area 204. The non-sensing area 204 is for setting a circuit such as the photosensitive driving circuit 23 that drives the photosensitive unit 22 to perform light sensing or a line bonding area for connecting the flexible circuit board. The shape of the sensing region 203 is consistent with the shape of the display region 101, and the size of the sensing region 203 is greater than or equal to the size of the display region 101, such that the photosensitive panel 200 can be placed at any position adjacent to or adjacent to the display region 101 of the display panel 100. Sensing of predetermined biometric information of the target object. Further, the area of the photosensitive panel 200 is less than or equal to the area of the display panel 100, and the shape of the photosensitive panel 100 is consistent with the shape of the display panel 100, so that the assembly of the photosensitive panel 200 and the display panel 100 is facilitated. However, in some embodiments, the area of the photosensitive panel 200 may also be larger than the area of the display panel 100.

When the mobile terminal 3 is in a bright screen state and is in the biometric information sensing mode, the display panel 100 emits an optical signal. When an object contacts or approaches the display area, the photosensitive panel 200 receives the optical signal reflected by the object, converts the received optical signal into a corresponding electrical signal, and acquires predetermined biometric information of the object according to the electrical signal. For example, fingerprint image information. Thereby, the photosensitive panel 200 can realize sensing of a target object contacting or approaching an arbitrary position of the display area 101.

However, the sensing area 203 of the photosensitive panel 200 may also be smaller than the display area 101 of the display panel 100 to realize the predetermined biometric information of the target object of the local area of the display area 101 of the display panel 100. Measurement.

The electronic device of the embodiment of the present invention has the following advantages:

First, the photosensitive panel is attached to the display panel, and the optical signal emitted by the display panel is used to realize the sensing of the biometric information of the target object, and no additional light source is needed, thereby saving the cost of the electronic device and achieving the contact. Or touching the target object at any position within the display area of the display panel to perform biometric information sensing. Moreover, the photosensitive device can be independently fabricated, and then the display device assembly of the electronic device is performed, thereby accelerating the preparation of the electronic device.

Second, since there is a difference in the reflection of the optical signal by different parts of the target object, the optical signals sensed between the adjacent photosensitive cells may be aliased, thereby causing the acquired sensing image to be blurred, so the embodiment of the present invention passes The anti-aliasing imaging element is arranged to prevent aliasing of the optical signals received by the adjacent photosensitive units, thereby improving the sensing accuracy of the photosensitive panel.

Thirdly, the photosensitive panel is located above the display panel, so the light signal reflected by the target object directly reaches the photosensitive panel, thereby avoiding interference of other substances during the transmission of the optical signal, and improving the sensing precision of the photosensitive panel.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples", etc. The specific features, structures, materials or characteristics described in the embodiments or examples are included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms does not necessarily mean the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

While the embodiments of the present invention have been shown and described above, it is understood that the foregoing embodiments are illustrative and are not to be construed as limiting the scope of the invention Variations, modifications, substitutions and variations of the embodiments described above are possible.

Claims

A photosensitive device includes a photosensitive panel and a filter film disposed on the photosensitive panel, wherein the filter film is configured to filter an optical signal other than a preset wavelength band.
The photosensitive device according to claim 1, wherein the optical signal other than the predetermined wavelength band is a long-band signal in ambient light.
The photosensitive device according to claim 1, wherein the predetermined wavelength band is a wavelength band corresponding to a blue light signal or a green light signal.
A photosensitive device according to claim 1, wherein said photosensitive panel comprises a substrate and a plurality of photosensitive cells disposed on said substrate.
A photosensitive device according to claim 4, wherein said substrate is a silicon substrate, a metal substrate, a printed circuit board or an insulating substrate.
A photosensitive device according to claim 4, wherein said photosensitive unit comprises at least one photosensitive member, said photosensitive member being a photosensitive member having high sensitivity to sensing an optical signal of said predetermined wavelength band.
The photosensitive device according to claim 1, wherein said filter film is formed directly on said photosensitive panel or separately formed on said photosensitive panel.
A photosensitive device according to claim 7, wherein said filter film comprises a plurality of filter units corresponding to said photosensitive cells.
A photosensitive device according to claim 7, wherein said filter film comprises a plurality of hollow regions, and said hollow regions are disposed offset from said photosensitive cells.
The photosensitive device according to any one of claims 1 to 9, wherein the photosensitive device further comprises an anti-aliasing imaging element, and the anti-aliasing imaging element is disposed on the filter film.
A photosensitive device according to claim 10, wherein said anti-aliasing imaging element further comprises a light absorbing wall, said light absorbing wall enclosing a plurality of light transmitting regions.
A photosensitive device according to claim 11, wherein said light absorbing wall comprises a plurality of light absorbing blocks and spacer blocks which are alternately stacked.
A photosensitive device according to claim 12, wherein said spacer is made of a transparent material.
The photosensitive device according to claim 10, wherein said anti-aliasing imaging member comprises a plurality of layers of light absorbing layers and transparent support layers alternately stacked; said light absorbing layer comprising a plurality of spaced apart light absorbing blocks; The transparent supporting layer is formed by filling with a transparent material and filling the interval between the light absorbing blocks together; wherein the area corresponding to the interval forms the light transmitting area.
The photosensitive device according to claim 14, wherein each of said transparent support layers has a thickness that is not equal.
The photosensitive device according to claim 15, wherein the thickness of said transparent supporting layer is increased layer by layer.
The photosensitive device according to claim 11 or 14, wherein the light transmitting region comprises a first light transmitting region, and the first light transmitting region is uniformly distributed.
The photosensitive device according to claim 11 or 14, wherein the light-transmitting region comprises a first light-transmitting region and a second light-transmitting region, and a cross-sectional area of the second light-transmitting region is greater than A light transmissive area has a large cross sectional area.
A photosensitive device according to claim 11, wherein said light transmitting region is filled with a transparent material.
The photosensitive device according to any one of claims 1 to 19, wherein the photosensitive device further comprises a signal processing circuit that obtains contact or proximity to the light signal sensed by the photosensitive panel Fingerprint image information of the target object of the photosensitive panel.
The photosensitive device according to any one of claims 1 to 19, wherein the photosensitive device is a biometric information sensing device.
An electronic device comprising the photosensitive device according to any one of claims 1 to 21.