阅读说明：本技术 有源像素传感器、显示面板、电子设备和驱动控制方法 (Active pixel sensor, display panel, electronic apparatus, and drive control method ) 是由 赵方圆 李扬冰 王佳斌 黄睿 朱海彬 王伟杰 郭玉珍 王雷 李必奇 于 2021-07-28 设计创作，主要内容包括：本申请公开了一种有源像素传感器、显示面板、电子设备和驱动控制方法。有源像素传感器包括感光像素阵列和感光驱动电路阵列。感光像素阵列包括多个感光元件；感光驱动电路阵列包括多个感光驱动电路,多个感光驱动电路与多个感光元件对应,感光驱动电路根据感光元件采集的光信号生成电信号；有源像素传感器对多个感光驱动电路生成的电信号进行检测以感应手指触控；有源像素传感器逐行读取感光驱动电路生成的电信号生成指纹图像。本申请的有源像素传感器能够在不加入更多膜层、结构的同时,利用原本用于光学指纹采集的感光元件,复用感光驱动电路实现可见光通信及光学触控功能,达到替代电子设备的其他功能模块,简化电子设备内部结构的目的。(The application discloses an active pixel sensor, a display panel, an electronic device and a drive control method. The active pixel sensor includes an array of photosensitive pixels and an array of photosensitive drive circuits. The photosensitive pixel array comprises a plurality of photosensitive elements; the photosensitive driving circuit array comprises a plurality of photosensitive driving circuits, the plurality of photosensitive driving circuits correspond to the plurality of photosensitive elements, and the photosensitive driving circuits generate electric signals according to optical signals collected by the photosensitive elements; the active pixel sensor detects the electric signals generated by the photosensitive driving circuits to sense finger touch; the active pixel sensor reads the electric signals generated by the photosensitive driving circuit line by line to generate a fingerprint image. The active pixel sensor can utilize the photosensitive element originally used for optical fingerprint collection without adding more films and structures, and can realize visible light communication and optical touch functions by multiplexing the photosensitive driving circuit, so that the purposes of replacing other functional modules of electronic equipment and simplifying the internal structure of the electronic equipment are achieved.)

1. An active pixel sensor, comprising:

a light-sensitive pixel array comprising a plurality of light-sensitive elements;

the photosensitive driving circuit array comprises a plurality of photosensitive driving circuits, the plurality of photosensitive driving circuits correspond to the plurality of photosensitive elements, and the photosensitive driving circuits generate electric signals according to optical signals collected by the photosensitive elements;

the active pixel sensor detects the electric signals generated by the photosensitive driving circuits to sense finger touch;

and the active pixel sensor reads the electric signals generated by the photosensitive driving circuit line by line to generate a fingerprint image.

2. The active pixel sensor of claim 1, wherein the light sensing driving circuit generates the electrical signal according to the light sensing element collecting the light signal emitted after being encoded by the light source, and the active pixel sensor analyzes the electrical signals generated by the light sensing driving circuits to obtain the data signal transmitted by the light source.

3. The active pixel sensor of claim 1, wherein the photosensing drive circuit comprises:

the first pole of the amplifying transistor is connected with a first power supply end, the grid electrode of the amplifying transistor is connected with the first pole of the photosensitive element, and the second pole of the photosensitive element is connected with a bias power supply end;

a reset switch transistor, a first pole of the reset switch transistor is connected with a reference power supply, a grid electrode of the reset switch transistor is connected with a reset control end, and a second pole of the reset switch transistor is connected with a grid electrode of the amplifying transistor;

a capacitor connected to the first and second poles of the photosensitive element;

and the grid electrode of the selection switch transistor is connected with the grid line, the first pole of the selection switch transistor is connected with the second pole of the amplification transistor, and the second pole of the selection switch transistor is connected with the reading circuit.

4. The active pixel sensor of claim 3, wherein the readout circuit comprises:

an input end of the IV conversion circuit is connected with the second pole of the selection switch transistor; and

and the output end of the IV conversion circuit is connected with the analog-to-digital conversion circuit.

5. The active pixel sensor of claim 1, comprising a substrate base plate, a circuit layer, and a device layer in a stacked arrangement,

the photosensitive driving circuit is positioned on the circuit layer, and the circuit layer comprises an active layer, a first insulating layer, a gate layer, a second insulating layer and a source drain layer which are arranged in a stacked mode;

the light emitting device is located in the device layer, and the device layer comprises a photosensitive material.

6. A display panel, comprising:

the active pixel sensor of any one of claims 1-5;

the light-emitting pixel array comprises a plurality of light-emitting elements, and the light-emitting elements and the light-sensing elements are arranged at intervals;

and the light-emitting driving circuit array comprises a plurality of light-emitting driving circuits, and the plurality of light-emitting driving circuits correspond to the plurality of light-emitting elements.

7. The display panel of claim 6, wherein the display panel comprises a metal layer, and wherein the display panel performs capacitive touch detection on the metal layer to initially locate finger touches.

8. An electronic device characterized by comprising the display panel of claim 6 or 7.

9. A driving control method for the active pixel sensor according to any one of claims 1 to 5, wherein the active pixel sensor senses a finger touch in a touch detection phase and generates the fingerprint image in an acquisition frame period, the acquisition frame period includes a reset phase, a transition phase and a data reading phase, the driving control method includes:

in a touch detection stage, providing a reset signal, a data reading signal and a first analog-digital sampling signal for the photosensitive driving circuits, and reading the electric signals generated by the photosensitive driving circuits collecting optical signals;

and the drive control method further includes:

in a reset phase, providing the reset signal to a plurality of the photosensitive driving circuits;

in a transition stage, stopping providing the reset signal to the photosensitive driving circuit to enable the photosensitive driving circuit to integrate the charges derived from the photosensitive element to generate the electric signal;

and in a data reading phase, providing the data reading signal and a second analog-to-digital sampling signal to the photosensitive driving circuit to read the electric signal.

10. The driving control method according to claim 9, wherein in a case where the photosensitive driving circuit generates the electrical signal according to the photosensitive element collecting the optical signal emitted after being encoded by the light source, the active pixel sensor acquires the data signal transmitted by the light source in a data transmission phase, the driving control method includes:

in the data transmission phase, a reset signal, a data reading signal and a first analog-to-digital sampling signal are provided for the photosensitive driving circuits so as to read the electric signals generated by the photosensitive driving circuits collecting the optical signals.

Technical Field

The present disclosure relates to the field of sensing technologies, and in particular, to an active pixel sensor, a display panel, an electronic device, and a driving control method.

Background

The mobile phone provides a user fingerprint identification function for identifying the user identity. The touch function is required to identify whether a finger presses on the screen, and the touch function of the mobile phone is an important function of the smart phone and is used for detecting whether the finger touches the screen of the mobile phone and identifying the position pressed by the finger. And subsequently determining the content clicked by the user according to the position pressed by the corresponding finger and the content on the current picture.

At present, most screen touch is realized by a capacitor, and the finger pressing position is identified by detecting the coupling capacitor between a human body and the touch screen. That is, a plurality of functional modules in the mobile phone are needed in the user identity identification process and the fingerprint identification process in the current mobile phone, and the internal structure of the mobile phone is complex.

Disclosure of Invention

In view of the above, the present invention is directed to solving, at least to some extent, one of the problems in the related art. To this end, an object of the present application is to provide an active pixel sensor, a display panel, an electronic device, and a drive control method.

The present application provides an active pixel sensor. The active pixel sensor includes: the photosensitive pixel array comprises a plurality of photosensitive elements; the photosensitive driving circuit array comprises a plurality of photosensitive driving circuits, the plurality of photosensitive driving circuits correspond to the plurality of photosensitive elements, and the photosensitive driving circuits generate electric signals according to optical signals collected by the photosensitive elements; the active pixel sensor detects the electric signals generated by the photosensitive driving circuits to sense finger touch; and the active pixel sensor reads the electric signals generated by the photosensitive driving circuit line by line to generate a fingerprint image.

In some embodiments, the photosensitive driving circuit generates the electrical signal according to the photosensitive element collecting the light signal emitted after being encoded by the light source, and the active pixel sensor analyzes the electrical signals generated by the plurality of photosensitive driving circuits to obtain the data signal transmitted by the light source.

In some embodiments, the photosensing drive circuit includes an amplifying transistor, a reset switch transistor, and a capacitance selection switch transistor. The first pole of the amplifying transistor is connected with a first power supply end, the grid of the amplifying transistor is connected with the first pole of the photosensitive element, and the second pole of the photosensitive element is connected with a bias power supply end; a first pole of the reset switch transistor is connected with a reference power supply, a grid electrode of the reset switch transistor is connected with a reset control end, and a second pole of the reset switch transistor is connected with a grid electrode of the amplifying transistor; the capacitor is connected with the first pole and the second pole of the photosensitive element; the grid electrode of the selection switch transistor is connected with the grid line, the first pole of the selection switch transistor is connected with the second pole of the amplification transistor, and the second pole of the selection switch transistor is connected with the reading circuit.

In some embodiments, the readout circuitry includes IV conversion circuitry and analog-to-digital conversion circuitry. The input end of the IV conversion circuit is connected with the second pole of the selection switch transistor; and the output end of the IV conversion circuit is connected with the analog-to-digital conversion circuit.

In some embodiments, the active pixel sensor includes a substrate base plate, a circuit layer, and a device layer in a stacked arrangement. The photosensitive driving circuit is positioned on the circuit layer, and the circuit layer comprises an active layer, a first insulating layer, a gate layer, a second insulating layer and a source drain layer which are arranged in a stacked mode; the light emitting device is located in the device layer, and the device layer comprises a photosensitive material.

The present application provides a display panel. The display panel comprises the active pixel sensor, the light-emitting pixel array and the light-emitting driving circuit array in any one of the above embodiments. The light-emitting pixel array comprises a plurality of light-emitting elements, and the light-emitting elements and the light-sensitive elements are arranged at intervals; the light-emitting driving circuit array includes a plurality of light-emitting driving circuits corresponding to the plurality of light-emitting elements.

In some embodiments, the display panel includes a metal layer, and the display panel performs capacitive touch detection on the metal layer to preliminarily locate finger touches.

The application provides an electronic device. The electronic device comprises the display panel of any one of the above embodiments.

The present application provides a drive control method for an active pixel sensor according to any one of the above embodiments. The active pixel sensor senses finger touch in a touch detection stage and generates the fingerprint image in an acquisition frame period, wherein the acquisition frame period comprises a reset stage, a transition stage and a data reading stage. The drive control method includes: in a touch detection stage, providing a reset signal, a data reading signal and a first analog-digital sampling signal for the photosensitive driving circuits, and reading the electric signals generated by the photosensitive driving circuits collecting optical signals; and the drive control method further includes: in a reset phase, providing the reset signal to a plurality of the photosensitive driving circuits; in a transition stage, stopping providing the reset signal to the photosensitive driving circuit to enable the photosensitive driving circuit to integrate the charges derived from the photosensitive element to generate the electric signal; and in a data reading phase, providing the data reading signal and a second analog-to-digital sampling signal to the photosensitive driving circuit to read the electric signal.

In some embodiments, in a case where the photosensitive driving circuit generates the electrical signal according to the photosensitive element collecting the optical signal emitted after being encoded by the light source, the active pixel sensor acquires the data signal transmitted by the light source in a data transmission stage. The drive control method includes: in the data transmission phase, a reset signal, a data reading signal and a first analog-to-digital sampling signal are provided for the photosensitive driving circuits so as to read the electric signals generated by the photosensitive driving circuits collecting the optical signals.

The active pixel sensor can utilize the photosensitive element originally used for optical fingerprint collection without adding more film layers and structures, and can realize visible light communication and optical touch functions by multiplexing the photosensitive driving circuit, so that the purposes of replacing other functional modules of a mobile phone and simplifying the internal structure of the mobile phone are achieved.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of an active pixel sensor according to some embodiments of the present application;

FIG. 2 is a schematic diagram of an active pixel sensor of certain embodiments of the present application in visible light communication;

FIG. 3 is a schematic view of a finger touching an active pixel sensor according to some embodiments of the present application;

FIG. 4 is a schematic diagram of the structure of a photosensitive drive circuit and a readout circuit according to some embodiments of the present application;

FIG. 5 is a schematic diagram of visible light communication timing control using an active pixel sensor according to some embodiments of the present application;

FIG. 6 is a schematic diagram of fingerprint acquisition timing control using an active pixel sensor according to some embodiments of the present application;

FIG. 7 is a schematic diagram illustrating an integration of visible light communication timing control and fingerprint acquisition timing control using active pixel sensors according to some embodiments of the present application;

FIG. 8 is a schematic diagram of the structure of an active pixel sensor according to some embodiments of the present application;

FIG. 9 is a schematic structural diagram of a display panel according to some embodiments of the present application;

FIG. 10 is a schematic structural diagram of a display panel according to some embodiments of the present application;

FIG. 11 is a schematic structural diagram of a display panel according to some embodiments of the present application;

FIG. 12 is a schematic structural diagram of an electronic device according to some embodiments of the present application;

FIG. 13 is a schematic flow chart diagram of a drive control method according to certain embodiments of the present application;

FIG. 14 is a schematic structural diagram of a drive control apparatus according to certain embodiments of the present application;

FIG. 15 is a flow chart diagram illustrating a drive control method according to certain embodiments of the present application;

fig. 16 is a schematic structural diagram of a drive control device according to some embodiments of the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.

A plurality of functional modules in the mobile phone are needed in the user identity identification process and the fingerprint identification process in the current mobile phone, and the internal structure of the mobile phone is complex.

In view of the above, referring to fig. 1, the present application provides an active pixel sensor 100. Active pixel sensor 100 includes an array of photosensitive pixels 110 and an array of photosensitive drive circuits 120. The photosensitive pixel array 110 includes a plurality of photosensitive elements 111. The photosensitive driving circuit array 120 includes a plurality of photosensitive driving circuits 121, and the plurality of photosensitive driving circuits 121 correspond to the plurality of photosensitive elements 111. The light sensing driving circuit 121 generates an electrical signal according to the optical signal collected by the light sensing element 111. The active pixel sensor 100 detects the electrical signals generated by the plurality of photo sensing driving circuits 121 to sense a finger touch. The active pixel sensor 100 reads the electrical signal generated by the photo sensing driving circuit 121 line by line to generate a fingerprint image.

Specifically, the light sensing element 111 refers to a light sensitive PIN for light fingerprint acquisition. The plurality of photosensitive driving circuits 121 corresponding to the plurality of photosensitive elements 111 means that the plurality of photosensitive driving circuits 121 correspond to the plurality of photosensitive elements 111 one to one (as shown in fig. 1).

When fingerprint unlocking is performed, the active pixel sensor 100 may detect the electrical signals generated by the plurality of photo sensing driving circuits 121 to sense finger touch. It will be appreciated that the light sensitive PIN can identify whether a finger is pressed by detecting whether light is shining. When a finger presses, the signal quantity of the corresponding part of pixels on the active pixel sensor 100 is reduced, and the detection of finger touch can be realized through the change of the signal quantity. Specifically, in order to confirm the touch of the human hand when pressing an object, the touch can be confirmed by illuminating the pulse wave carried by the human finger. When the light returns from the finger, the blood flow in the human body is carried in the light and received by the active pixel sensor 100, thereby completing the touch control. The light carrying rule of human blood flow is received by the photosensitive PIN in the active pixel sensor 100, and then the visible light communication function of the active pixel sensor 100 is achieved.

Specifically, referring to fig. 3, when the ambient light irradiates the active pixel sensor 100, the photosensitive PIN of the irradiation portion receives more photons, outputs more charges, and outputs a larger amount of signals. When a finger is shielded, because photons irradiated on the photosensitive PIN are reduced, the number of photons in the photosensitive PIN is obviously different from that in other non-finger-shielded areas, and the data volume in finally read data is also obviously different, so that the finger touch position is identified.

When a fingerprint image needs to be acquired after the fingerprint unlocking is completed, the active pixel sensor 100 reads the electrical signals generated by the photosensitive driving circuit 121 line by line to generate a fingerprint image. Specifically, when the finger is pressed, the light intensity I received by the active pixel sensor 100 under the fingerprint valley ridge is different, and the read-out signal quantity is different, so that the fingerprint valley ridge difference can be embodied, the fingerprint image is collected, and the visible light communication function of the active pixel sensor 100 is realized.

In summary, the active pixel sensor 100 of the present application can realize visible light communication and optical touch function by using the photosensitive element 111 originally used for optical fingerprint acquisition and the multiplexing photosensitive driving circuit 121 without adding more films and structures, thereby achieving the purpose of replacing other functional modules of the electronic device and simplifying the internal structure of the electronic device.

In some embodiments, the photosensitive driving circuit 121 generates an electrical signal according to the light signals emitted after the photosensitive element 111 collects the light signals encoded by the light sources, and the active pixel sensor 100 analyzes the electrical signals generated by the plurality of photosensitive driving circuits 121 to obtain the data signals transmitted by the light sources.

It can be understood that, referring to fig. 2, the principle of visible light communication is to use the flickering of the light source to carry data information in the light. The light is defined as 1, the dark is defined as 0, and the data information loaded in the light can be obtained through encoding and decoding. Wherein, the data 1 and 0 are data signals transmitted by the light source.

The electrical signal may be a voltage signal, a current signal, or other signals, which is not limited herein. The present application takes an electrical signal as an example of a voltage signal.

The structure, composition and operation principle of the photosensitive driving circuit 121 are described in detail below.

Referring to fig. 4, the photo sensing driving circuit 121 includes: an amplifying transistor 1211(Tsf), a reset switch transistor 1212(Trst), a capacitor 1213(Cs), and a selection switch transistor 1214 (Tsel).

A first electrode of the amplifying transistor 1211(Tsf) is connected to the first power supply terminal Vdd, a gate electrode of the amplifying transistor 1211 is connected to the first electrode of the light sensing element 111, and a second electrode of the light sensing element 111(PIN) is connected to the bias power supply terminal Vbias. Specifically, the photosensitive PIN is used for detecting the current irradiation light intensity to perform photoelectric conversion.

A first pole of the reset switch transistor 1212(Trst) is connected to the reference power source Vrst, a gate of the reset switch transistor 1212 is connected to the reset control terminal R, and a second pole of the reset switch transistor 1212 is connected to the gate of the amplifying transistor 1211 (Tsf).

The capacitor 1213(Cs) connects the first and second poles of the light sensing element 111 (PIN).

The GATE of the selection switch transistor 1214(Tsel) is connected to the GATE line GATE, the first electrode of the selection switch transistor 1214 is connected to the second electrode of the amplification transistor 1211(Tsf), and the second electrode of the selection switch transistor 1214 is connected to the readout circuit 130.

It will be appreciated that the active pixel sensor 100 also includes a readout circuit 130. The readout circuit 130 includes: an IV conversion circuit 131 and an analog-to-digital conversion circuit 132. The input terminal of the IV conversion circuit 131 is connected to the second pole of the selection switch transistor 1214 (Tsel). The output end of the IV conversion circuit 131 is connected to the analog-to-digital conversion circuit 132.

Specifically, the operation principle of the photo sensing driving circuit 121 is as follows:

when exposure is started, a reset signal sent by the reset control terminal R reversely biases the photosensitive PIN to a reset voltage Vrst 'provided by a reference power supply Vrst, and the photosensitive PIN is "charged" in this time, so that the charge amount of the photosensitive PIN is finally Qrst Cpin Vrst'.

After the charging is completed, the reset switch transistor 1212(Trst) will be turned off, and the photo PIN is in a floating state, i.e. no voltage, and when the light intensity on the photo PIN is 0, both Vrst and Qrst will be held on the PIN capacitor. And when a certain light intensity I is present₀When the photosensitive PIN is irradiated, photons can excite a PN junction to generate a hole-electron pair, so that charges at two ends of a capacitor 1213(Cs) are combined, the charge quantity on the photosensitive PIN is reduced from Qrst, and the point position of a PD point is reduced. The P-type semiconductor and the N-type semiconductor are manufactured on the same semiconductor (usually silicon or germanium) substrate by adopting different doping processes and diffusion, a space charge region formed at an interface between the P-type semiconductor and the N-type semiconductor is called a PN junction, and the PN junction has unidirectional conductivity.

At this time, the amplifying transistor 1211(Tsf) may be operated in a saturation region in which a change in the source potential of the amplifying transistor 1211(Tsf) causes a current I flowing through the amplifying transistor 1211(Tsf)_DSAnd (4) changing. Then, the selection switch transistor 1214(Tsel) is controlled to be turned on by the GATE line GATE, so that the current I flows_DSThe light intensity I is obtained by the IV conversion circuit 131 flowing into the back-end readout circuit 130₀Output voltage ofVout, that is, the electric signal Vout is obtained.

Then, the analog electrical signal Vout is read out and converted into a data signal by the analog-to-digital conversion circuit 132, and a frame of sensing data can be acquired.

When active pixel sensor 100 is array arrangement, when the finger pressed, the light intensity I received by the active pixel sensor under the fingerprint ridge was different, and the semaphore of reading out was different, can embody the fingerprint ridge difference to fingerprint image can be gathered.

The working principle of controlling the photosensitive driving circuit 121 to realize visible light communication and optical touch is described below in combination with a scene where a user performs fingerprint touch unlocking on a mobile phone lock screen.

Specifically, when the mobile phone locks the screen, the photosensitive PIN is required to be used for visible light communication. The visible light communication timing at this time is controlled as shown in fig. 5. At this time, since the reset signals R' of the reset signal terminals R of all the rows in the photo sensing driving circuit 121 are always at the high level, the reset switching transistor 1212(Trst) is in a conductive state. At this time, the resistance corresponds to a fixed resistance value between the PD point and the reference power source Vrst.

When the light intensity irradiated on the photosensitive PIN changes, the electric charge derived from the photosensitive PIN changes, so that the point position of the PD point changes in real time. Meanwhile, the GATE signals controlled by the GATE lines GATE of all the rows are always high, the select switch transistor 1214(Tsel) controlled by the GATE line GATE is always on, and the data read by the analog-to-digital conversion circuit 132 also changes in real time along with the point position of the PD point. Therefore, by sampling the fingerprint through the analog-to-digital conversion circuit 132, a data stream related to the sampling frequency of the analog-to-digital conversion circuit 132 is obtained, thereby realizing optical communication.

When a finger presses on the screen, the finger can shield partial area of the photosensitive PIN to receive light. When the visible light communication value of some areas is always 0 different from that of other areas, the fact that the shielding object exists is proved, and pulse wave detection is carried out by determining the position of the shielding object.

When the pulse wave feature in the blood flow is detected, it is proved that the finger is pressed on the screen, and the fingerprint collection is started, wherein the fingerprint collection time sequence is shown in fig. 6. For each row of active pixel sensors 100 in the array, reset (rst) is performed, and then after a certain integration time, the select switch transistor 1214(Tsel) controlled by the GATE line GATE is turned on, and the analog-to-digital conversion circuit 132 starts reading the output voltage when the select switch transistor 1214(Tsel) controlled by the GATE line GATE is turned on. And resetting (rst) again after the full screen is scanned, and carrying out fingerprint acquisition for the next time. This enables optical fingerprint acquisition based on the photosensing drive circuit 121 in the active pixel sensor 100.

After the fingerprint image is obtained, the photosensitive PIN can be continuously used for optical communication and touch control when fingerprint collection is not needed after the mobile phone is unlocked.

The complete process after integrating the visible light communication timing sequence and the fingerprint acquisition timing sequence control process is shown in fig. 7. The active pixel sensor 100 of the present application multiplexes the visible light communication and the optical touch function, and can realize the time sequence combination of the optical fingerprint recognition, the optical touch and the visible light communication, and the time sequence is consecutive, so that the user experience is improved.

In the above description of the circuit for multiplexing the visible light communication and the optical touch function of the active pixel sensor 100, the structure of the active pixel sensor 100 will be described from the perspective of three-dimensional mounting.

Referring to fig. 8, the active pixel sensor 100 includes a Substrate 140(Substrate), a circuit layer 150(Poly layer to PLN1 layer), and a device layer 160(PVX2 layer to ITO-cap layer) stacked on top of each other.

A Buffer layer Buffer may be further included between the Substrate base 140(Substrate) and the circuit layer 150(Poly layer — PLN1 layer). It is understood that since the mismatch between the high-speed device and the low-speed device may cause the high-speed device to spend time waiting for the low-speed device, a Buffer may be established between the two devices, i.e. the Buffer.

The photosensitive driving circuit 121 is located in the circuit layer 150. The circuit layer 150 includes a polysilicon layer Poly, a first insulating layer GI, a Gate layer Gate, a second insulating layer ILD, and a source drain layer SD 1. The two SD1 in fig. 3 may be a source and a drain, respectively, i.e., the positions of the source and the drain are not limited.

The active layer is mainly used for forming the MOS tube. The gate of the MOS transistor is formed by polysilicon (Poly), and the source and drain of the MOS transistor are formed by SD1 implantation in fig. 3. The sources and drains of the integrated MOS transistors are interchangeable, such as the sources and drains of the reset switch transistor 1212(Trst) and the select switch transistor 1214(Tsel) described above.

The first insulating layer GI may isolate the active layer Poly from the Gate layer Gate, so that the active layer Poly and the Gate layer Gate do not affect each other. The second insulating layer ILD may isolate the Gate layer Gate from the source drain layer SD1, such that the Gate layer Gate and the source drain layer SD1 do not affect each other.

The second insulating layer ILD is provided with 2 via holes, and the source electrode SD1 and the drain electrode SD1 are electrically connected to the active layer Poly through the corresponding via holes.

The light emitting device is located in the device layer 160, and the device layer 160 comprises a photosensitive material PIN, an SD2 electrode and an ITO-cap panel layer. The SD2 electrode may be electrically connected to the source SD1, and the SD2 electrode may transmit an electrical signal to and from the source SD 1.

In addition, the active pixel sensor 100 further includes a level of the package layer Cover and other light elements, for example, the polarizer layer POL in fig. 3. The packaging layer Cover can protect circuits and devices inside the active pixel sensor 100 from falling ash and being affected with damp, and the service life of the active pixel sensor 100 is prolonged.

Referring to fig. 9, the present application further provides a display panel 200. The display panel 200 includes an active pixel sensor 100, a light emitting pixel array 210, and a light emitting driving circuit array 220. The light emitting pixel array 210 includes a plurality of light emitting elements 211. The light-emission driving circuit array 220 includes a plurality of light-emission driving circuits 221, and the plurality of light-emission driving circuits 221 correspond to the plurality of light-emitting elements 211.

That is, the active pixel sensor 100 may be integrated in the display panel 200 and integrated with the display panel 200, which is beneficial to the light and thin of the display panel 200. Meanwhile, in an example, the active pixel sensors 100 may be distributed in the whole area of the display panel 200, so that the whole area of the display panel 200 may be used for visible light communication and light touch, the visible light communication area and the optical touch area are widened, and the method may be applied to an application scenario in which the whole area of the display panel 200 is used for fingerprint collection and touch screen detection, thereby improving user experience.

In another example, the active pixel sensors 100 may be distributed in a partial area of the display panel 200 to implement a visible light communication function and an optical touch function in the partial area of the display panel 200, which can be applied to an application scenario in which fingerprint acquisition and touch screen detection are performed by using the partial area of the display panel 200.

In addition, the active pixel sensor 100 includes the photosensitive element 111, and the light emitting element 211 and the photosensitive element 111 may be arranged at intervals, as shown in fig. 10, the light emitting element 211 and the photosensitive element 111 are arranged at intervals, so that the display panel 100 has different transmitting and receiving channels, and further the display panel 100 may select an optimal channel and the number of channels for transmission according to the channel state monitoring and information transmission requirements, expand the bandwidth, and improve the transmission rate and the signal-to-noise ratio.

Referring to fig. 11, the display panel 200 may include a display surface 201 and a back surface 202 opposite to each other. The active pixel sensor 100 may also be located on the back side 202 of the display panel 200 as a separate device, and the light sensing element 111 collects light signals through the display panel 200. At this time, the active pixel sensor 100 is disposed on the back surface of the display panel 200 as a separate device, which facilitates the mounting and dismounting of the display panel 200 and the active pixel sensor 100.

In this case, the active pixel sensor 100 may be disposed in a partial region of the back surface 202, so as to implement a visible light communication function and an optical touch function in the partial region of the display panel 200, and may be applied to an application scenario in which fingerprint acquisition and touch detection are performed using the partial region of the display panel 200.

Or, at this time, the active pixel sensor 100 may also cover the entire back surface 202, so that the entire area of the display panel 200 may be used for visible light communication and optical touch, the visible light communication area and the optical touch area are widened, and the display panel may be applied to an application scenario in which fingerprint acquisition and touch detection are performed by using the entire area of the display panel 200, thereby improving user experience.

In some embodiments, the display panel 200 may include a metal layer, and the display panel 200 performs capacitive touch detection on the metal layer to perform preliminary positioning on the finger touch. Understandably, in order to ensure the accuracy of touch detection, the positioning accuracy can be increased by performing a certain degree of capacitive touch detection on the metal layer in the screen film layer to preliminarily position the finger touch.

The display panel 200 of the present application can utilize the photosensitive element originally used for optical fingerprint acquisition through the active pixel sensor 100, and the multiplexing photosensitive driving circuit realizes the visible light communication and the optical touch function, thereby achieving the purpose of replacing other functional modules of the electronic device and simplifying the internal structure of the electronic device.

Referring to fig. 12, the present application further provides an electronic device 300. The electronic device 300 includes the display panel 200. The electronic device 300 may be a mobile phone, a tablet computer, a fingerprint lock, or other device with fingerprint identification and unlocking functions.

The electronic device 300 of the present application has the display panel 200, and the display panel 200 can utilize the photosensitive element originally used for optical fingerprint collection through the active pixel sensor 100, and the multiplexing photosensitive driving circuit realizes the visible light communication and the optical touch function, thereby achieving the purpose of replacing other functional modules of the electronic device 300 and simplifying the internal structure of the electronic device 300.

Referring to fig. 13, the present application further provides a driving control method for the active pixel sensor 100. The active pixel sensor 100 senses finger touch in a touch detection stage and generates a fingerprint image in an acquisition frame period, wherein the acquisition frame period comprises a reset stage, a transition stage and a data reading stage, and the driving control method comprises the following steps:

02: in the touch detection stage, a reset signal, a data reading signal and a first analog-to-digital sampling signal are provided to the plurality of photosensitive driving circuits 121, and an electric signal generated by collecting an optical signal by the plurality of photosensitive driving circuits 121 is read;

and the drive control method further includes:

04: in the reset phase, a reset signal is provided to the plurality of photo sensing driving circuits 121;

06: in the transition phase, the supply of the reset signal to the photosensitive driving circuit 121 is stopped to enable the photosensitive driving circuit 121 to integrate the charges derived from the photosensitive element 111 to generate an electric signal;

08: in the data reading phase, a data reading signal and a second analog-to-digital sampling signal are supplied to the photo sensing driving circuit 121 to read the electrical signal.

Referring to fig. 14, the present application further provides a driving control apparatus 10. The driving control device 10 includes a touch detection module 12, a reset module 14, a transition module 16, and a data reading module 18.

Step 02 may be implemented by the touch detection module 12, step 04 may be implemented by the reset module 14, step 06 may be implemented by the transition module 16, and step 08 may be implemented by the data reading module 18. That is, the touch detection module 12 is configured to provide a reset signal, a data reading signal, and a first analog-to-digital sampling signal to the plurality of photosensitive driving circuits 121 in the touch detection stage, and read an electrical signal generated by the plurality of photosensitive driving circuits 121 collecting an optical signal; the reset module 14 is configured to provide a reset signal to the plurality of photo sensing driving circuits 121 in a reset phase; the transition module 16 is configured to stop providing the reset signal to the photosensitive driving circuit 121 in the transition phase, so that the photosensitive driving circuit 121 integrates the charges derived by the photosensitive element 111 to generate an electrical signal; the data reading module 18 is configured to provide a data reading signal and a second analog-to-digital sampling signal to the photosensitive driving circuit 121 to read the electrical signal during a data reading phase.

Specifically, referring to fig. 7, in a touch detection stage (i.e., a first stage in fig. 7), the touch detection module 11 provides a reset signal, a data read signal and a first analog-to-digital sampling signal to the plurality of photo sensor circuits 121, and reads an electrical signal generated by the plurality of photo sensor circuits 121 collecting an optical signal, so as to implement a finger-sensing touch detection function of the active pixel sensor 100.

The reset signal is an R signal in the first stage of fig. 7, the data read signal is a Gate signal in the first stage of fig. 7, and the first analog-to-digital sampling signal is an ADC sampling signal in the first stage of fig. 7.

The acquisition frame period of fingerprint acquisition includes a reset phase, a transition phase and a data reading phase (i.e., the second phase in fig. 7 or the schematic shown in fig. 6). As can be seen from fig. 6, for each row of the active pixel sensors 100 in the array, reset (rst) is performed, and then after a certain integration time, the select switch transistor 1214(Tsel) controlled by the GATE line GATE is turned on, and the analog-to-digital conversion circuit 132 starts to read the output voltage when the select switch transistor 1214(Tsel) controlled by the GATE line GATE is turned on. And resetting (rst) again after the full screen is scanned for next fingerprint collection, so that the optical fingerprint collection based on the photosensitive driving circuit 121 in the active pixel sensor 100 is realized.

The reset signal is an R signal at the second stage in fig. 7, the data read signal is a Gate signal at the second stage in fig. 7, and the second analog-to-digital sampling signal is an ADC sampling signal at the second stage in fig. 7.

Referring to fig. 15, in some embodiments, in a case that the photosensitive driving circuit 121 generates an electrical signal according to the light signal emitted after the photosensitive element 111 collects the light signal encoded by the light source, the active pixel sensor 100 obtains the data signal transmitted by the light source in a data transmission stage, and the driving control method includes:

01: in the data transmission phase, the reset signal, the data read signal and the first analog-to-digital sampling signal are provided to the plurality of photo sensing driving circuits 121 to read the electrical signals generated by the plurality of photo sensing driving circuits collecting the optical signals.

Referring to fig. 16, the driving control apparatus 10 includes a data transmission module 11.

Step 01 may be implemented by the data transmission module 11. That is, the data transmission module 11 is configured to provide the reset signal, the data reading signal and the first analog-to-digital sampling signal to the plurality of photo sensor driving circuits 121 in the data transmission phase, so as to read the electrical signals generated by the plurality of photo sensor driving circuits collecting the optical signals.

Specifically, referring to the first stage in fig. 7, during the touch detection, the driving control device 10 may further drive the photosensitive driving circuit 121 to convert the collected optical signal into an electrical signal through the data transmission module 11, so as to implement the optical communication function of the active pixel sensor 100.

In summary, the driving control method and the driving control device thereof of the present application can realize that the active pixel sensor realizes the visible light communication and the optical touch function by multiplexing the photosensitive driving circuit without adding more films and structures, thereby achieving the purpose of replacing other functional modules of the electronic device and simplifying the internal structure of the electronic device.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.