A method and device for screen unlocking by synchronously verifying fingerprint information

Abstract

The present invention provides a method and apparatus for screen unlocking by synchronously verifying fingerprint information. The method includes: receiving a sliding trajectory of a user on the fingerprint recognition area, synchronously collecting fingerprint information corresponding to the user's finger, and determining whether screen unlocking is completed according to a matching result between the sliding trajectory and the collected fingerprint information. Among them, synchronously collecting fingerprint information corresponding to the user's finger includes: the display pixels emitting optical signals, and the light screening component filtering the reflected optical signals to screen out the optical signals within a preset angle range; the sensing unit receiving the optical signals screened out by the light screening component. By using the method of the present invention, the accuracy of the reconstructed fingerprint information can be effectively improved.

Description

[0001] This application is a divisional application of the invention patent with the application number "201810475509.X", the application date of May 17, 2018, and the title of "A Screen Unlocking Method and Device for Synchronously Verifying Fingerprint Information". Technical Field

[0002] The present invention relates to the field of electronic devices, and particularly to a method and device for screen unlocking that synchronously verifies fingerprint information. Background Art

[0003] With the development of technology and technological progress, touch display panels have been widely used in devices that require a human-computer interaction interface, such as the operation screens of industrial computers, tablet computers, touch screens of smart phones, and so on. Since a large amount of user information is usually involved during the use of these devices, the protection of user information security is particularly important. Among various information security protection methods, fingerprint recognition encryption is an important one.

[0004] Currently, the boot unlocking of electronic devices usually includes two methods: swipe screen unlocking and fingerprint unlocking. Swipe screen unlocking is to compare the sliding trajectory input by the user with the pre-set sliding trajectory. If they match, the electronic device is unlocked. Since the swipe screen unlocking method does not introduce the recognition of user physiological characteristic information, there are relatively large security risks. Fingerprint unlocking is to compare the currently collected user fingerprint information with the pre-stored fingerprint information. If the two match, the electronic device is unlocked. Compared with swipe screen unlocking, the security of the fingerprint unlocking method has been greatly improved.

[0005] However, in current display panel technologies, whether it is a liquid crystal display (LCD), an active matrix organic light-emitting diode (AMOLED) display, or a micro light-emitting diode (micro-LED) display, they all use a thin film transistor (TFT) structure to scan and drive a single pixel to achieve the display function of the pixel array on the screen. The main structure for forming the TFT switching function is a semiconductor field effect transistor (FET). Well-known main materials of the semiconductor layer include amorphous silicon, polycrystalline silicon, indium gallium zinc oxide (IGZO), or organic compounds mixed with carbon nanomaterials, etc. Since the structure of a photodetector diode (Photo Diode) can also be prepared using such semiconductor materials, and the production equipment is also compatible with the production equipment of the TFT array, and the prepared photosensitive diode can be directly integrated with the TFT and the TFT can be used to achieve the scanning and driving functions of the photosensitive diode, in recent years, TFT photodetector diodes have begun to be produced in the form of TFT array preparation methods and are widely used in X-ray sensing flat devices, as described in the Chinese patents CN103829959B and CN102903721B.

[0006] Compared with the image sensor devices prepared from traditional crystalline materials, the band gaps of the above TFT light detection array thin film materials mainly absorb visible light. Therefore, they are more susceptible to interference from ambient visible light to form noise, resulting in a lower signal-to-noise ratio (SNR). Limited by this, the initial application of the TFT light sensing array is mainly for X-ray sensing flat panel devices. The main reason is that X-rays are short-wavelength light with high collimation. The X-ray image first enters the wavelength conversion material configured on the sensing flat panel, converts the X-ray image into visible light with a longer wavelength, and then directly transmits it to the TFT light detection array thin film inside the sensing flat panel, avoiding the noise interference caused by visible light in the surrounding environment, as described in the above-mentioned Chinese patents CN103829959B and CN102903721B.

[0007] If such well-known TFT visible light detection array thin films are configured in a display screen structure, it can be used as a solution to integrate the light detection function into the display screen. However, limited by factors such as the thickness of the display screen and the aperture of the display pixels, the real image sensed by the light detection diode array has already undergone optical distortions such as diffraction. Moreover, because the optical signal penetrates multiple layers of the display screen structure and in the case where the optical display signal and the touch sensing signal coexist, it is very difficult to extract useful optical signals from a low signal-to-noise ratio scenario, and the technical difficulty level reaches almost the level of single-photon imaging. It is necessary to reconstruct the original image by performing operations according to the optical wave theory through relevant algorithms. To avoid this technical difficulty, it is well-known that additional optical enhancement devices are required when configuring the visible light sensor thin film in the original display screen structure, or only configuring the light sensor thin film inside the side of the display screen and using the light that reaches the side through non-vertical reflection for optical image reconstruction. For example, as described in Chinese patent CN101359369B. However, although such technologies can avoid the technical difficulties of weak light imaging, the additional optical devices increase the thickness of the light detection display screen, and the configuration method on the side of the display screen cannot meet the full-screen experience of users.

[0008] In short, the current electronic devices still collect the user's fingerprint information through corresponding sensors. Users can only place their fingers at specific positions outside the screen (such as the HOME button of an Apple mobile phone) so that the user's fingerprint information can be collected by the sensor below. The operation position is fixed, and the user's sensory experience is poor.

[0009] In summary, it is particularly necessary to provide a screen unlocking solution that synchronously authenticates the user's fingerprint information while the user performs a screen swiping unlock. Summary of the Invention

[0010] For this reason, a technical solution for screen unlocking that synchronously verifies fingerprint information is required to solve the problem that the fingerprint information reconstructed by the existing sensing unit is inaccurate.

[0011] To achieve the above object, in a first aspect, the present invention provides a method for screen unlocking that synchronously verifies fingerprint information. The method is applied to a screen unlocking device that synchronously verifies fingerprint information. The device includes a light-transmitting cover plate, a light screening component, a display unit, and a sensing unit; the display unit includes display pixels, a fingerprint recognition area is provided on the display unit, and the sensing unit is used to obtain fingerprint information on the fingerprint recognition area;

[0012] The method includes:

[0013] Receiving the sliding trajectory of the user on the fingerprint recognition area and synchronously collecting the fingerprint information corresponding to the user's finger;

[0014] When it is detected that the sliding trajectory of the user on the fingerprint recognition area matches the preset sliding trajectory, it is judged whether the synchronously collected fingerprint information matches the preset fingerprint information. If so, the screen unlocking is completed; otherwise, the screen unlocking fails;

[0015] Among them, synchronously collecting the fingerprint information corresponding to the user's finger includes:

[0016] The display pixels emit light signals, and the light signals are reflected on the upper surface of the light-transmitting cover plate to form reflected light signals;

[0017] The light screening component filters the reflected light signals and screens out the light signals within a preset angle range;

[0018] The sensing unit receives the light signals screened out by the light screening component.

[0019] As an optional embodiment, the light screening component includes optical glue;

[0020] The light screening component filters the reflected light signals and screens out the light signals within a preset angle range. The sensing unit receiving the light signals screened out by the light screening component includes:

[0021] The optical glue filters the reflected light signals with an incident angle greater than the first critical angle in the optical glue to obtain the first reflected light signals, and the sensing unit receives the first reflected light signals; the first critical angle is the critical angle at which the reflected light signals can undergo total internal reflection on the surface of the optical glue.

[0022] As an optional embodiment, the optical glue is attached to the lower surface of the display unit; the refractive index of the optical glue is less than the refractive index of the light-transmitting cover plate.

[0023] As an alternative embodiment, the light screening component includes an optical device and an optical adhesive;

[0024] The light screening component filters the reflected light signal and screens out the light signal within a preset angular range. The sensing unit receiving the light signal screened by the light screening component includes:

[0025] The optical adhesive filters the reflected light signal in which the incident angle in the optical adhesive is greater than the first critical angle to obtain a first reflected light signal, and the first reflected light signal enters the optical device; the first critical angle is the critical angle at which the reflected light signal can undergo total internal reflection on the surface of the optical adhesive.

[0026] The optical device filters the first reflected light signal in which the incident angle on the surface of the optical device is less than the second critical angle to obtain a second reflected light signal, and the sensing unit receives the second reflected light signal; the second critical angle is the critical angle at which the light signal emitted by the display pixel can undergo total internal reflection on the upper surface of the transparent cover plate.

[0027] As an alternative embodiment, the light screening component includes an optical device;

[0028] The light screening component filters the reflected light signal and screens out the light signal within a preset angular range. The sensing unit receiving the light signal screened by the light screening component includes:

[0029] The optical device filters the reflected light signal in which the incident angle on the surface of the optical device is less than the second critical angle to obtain a second reflected light signal, and the sensing unit receives the second reflected light signal; the second critical angle is the critical angle at which the light signal emitted by the display pixel can undergo total internal reflection on the upper surface of the transparent cover plate.

[0030] As an alternative embodiment, the optical device is further adapted to cause the second reflected light signal to enter the sensing unit at an incident angle less than a preset angle.

[0031] As an alternative embodiment, the sensing unit is a light detection array film.

[0032] As an alternative embodiment, the light detection array film includes a plurality of pixel detection regions, each pixel detection region is correspondingly provided with a pixel detection structure, and each pixel detection structure includes a pixel thin film circuit composed of thin film transistors and a light detection unit.

[0033] As an alternative embodiment, the light detection unit includes a photodiode or a phototransistor.

[0034] As an alternative embodiment, the light detection array film is an array formed by photosensitive diodes, and the photosensitive diodes include photosensitive diode sensing regions, and a photosensitive diode layer is disposed in the photosensitive diode sensing regions.

[0035] As an alternative embodiment, the photosensitive diode layer includes a p-type semiconductor layer, an i-type semiconductor layer, and an n-type semiconductor layer, and the p-type semiconductor layer, the i-type semiconductor layer, and the n-type semiconductor layer are stacked from top to bottom, and the i-type semiconductor layer is a microcrystalline silicon structure or an amorphous silicon germanide structure.

[0036] As an alternative embodiment, the light detection array film is an array formed by photosensitive transistors, and the photosensitive transistors include photosensitive transistor sensing regions, and a photosensitive thin film transistor is disposed in the photosensitive transistor sensing regions.

[0037] As an alternative embodiment, the photosensitive thin film transistor includes a source electrode, a drain electrode, and a light absorption semiconductor layer; a photosensitive leakage current channel is formed horizontally between the source electrode and the drain electrode, and the light absorption semiconductor layer is disposed in the photosensitive leakage current channel.

[0038] As an alternative embodiment, the fingerprint recognition area includes a plurality of fingerprint recognition sub-areas, and a sensing unit is correspondingly disposed below each fingerprint recognition sub-area; the method includes:

[0039] Receiving a start instruction of the user for the fingerprint recognition sub-area, and turning on the sensing unit below the fingerprint recognition sub-area;

[0040] Alternatively, receiving a close instruction of the user for the fingerprint recognition sub-area, and turning off the sensing unit below the fingerprint recognition sub-area.

[0041] As an alternative embodiment, the display unit is a self-luminous diode display screen.

[0042] As an alternative embodiment, the device further includes a touch screen and a processor;

[0043] The light signal emitted by the display pixel includes:

[0044] When the processor detects a touch signal of the user's finger on the touch screen, the processor sends a display driving signal to the display unit;

[0045] When the display pixel receives the display driving signal sent by the processor, the display pixel emits a light signal.

[0046] As an alternative embodiment, the device includes a processor, and the method includes:

[0047] The processor generates and outputs physiological characteristic recognition image information according to the second reflected light signal received by the sensing unit.

[0048] As an alternative embodiment, the display screen includes a plurality of display pixels, and the method includes:

[0049] The processor performs signal superposition on the second reflected light signals corresponding to the optical signals emitted by several groups of single display pixels or several groups of display pixel arrays, reconstructs the complete physiological feature recognition image information, and outputs it; each group of display pixel arrays includes a plurality of display pixels.

[0050] In a second aspect, the present invention further provides a device for screen unlocking that synchronously verifies fingerprint information. The device includes a light filtering component, a display unit, a processor, a sensing unit, and a computer program; the display unit includes display pixels, a fingerprint recognition area is provided on the display unit, and the sensing unit is used to obtain the fingerprint information on the fingerprint recognition area;

[0051] The sensing unit is used to receive the sliding trajectory of the user on the fingerprint recognition area and synchronously collect the fingerprint information corresponding to the user's finger;

[0052] When the computer program is executed by the processor, the following steps are implemented:

[0053] When it is detected that the sliding trajectory of the user on the fingerprint recognition area matches the preset sliding trajectory, it is determined whether the synchronously collected fingerprint information matches the preset fingerprint information. If so, the screen unlocking is completed; otherwise, the screen unlocking fails;

[0054] Among them, synchronously collecting the fingerprint information corresponding to the user's finger includes:

[0055] The display pixels are used to emit optical signals, and the optical signals are reflected on the upper surface of the light-transmitting cover plate to form reflected light signals;

[0056] The light filtering component is used to filter the reflected light signals and screen out the light signals within a preset angle range;

[0057] The sensing unit is used to receive the light signals screened out by the light filtering component.

[0058] As an alternative embodiment, the light filtering component includes optical glue;

[0059] The light filtering component is used to filter the reflected light signals and screen out the light signals within a preset angle range. That the sensing unit is used to receive the light signals screened out by the light filtering component includes:

[0060] The optical adhesive is used to filter the reflected light signals in the reflected light signals whose incident angle in the optical adhesive is greater than the first critical angle, so as to obtain the first reflected light signal, and the sensing unit is used to receive the first reflected light signal; the first critical angle is the critical angle at which the reflected light signal can undergo total internal reflection on the surface of the optical adhesive.

[0061] As an optional embodiment, the optical adhesive is attached to the lower surface of the display unit; the refractive index of the optical adhesive is less than that of the light-transmitting cover plate.

[0062] As an optional embodiment, the light screening component includes an optical device and an optical adhesive;

[0063] The light screening component is used to filter the reflected light signals and screen out the light signals within a preset angle range, and the sensing unit is used to receive the light signals screened out by the light screening component, including:

[0064] The optical adhesive is used to filter the reflected light signals in the reflected light signals whose incident angle in the optical adhesive is greater than the first critical angle, so as to obtain the first reflected light signal, and the first reflected light signal enters the optical device; the first critical angle is the critical angle at which the reflected light signal can undergo total internal reflection on the surface of the optical adhesive;

[0065] The optical device is used to filter the first reflected light signals in the first reflected light signals whose incident angle on the surface of the optical device is less than the second critical angle, so as to obtain the second reflected light signal, and the sensing unit is used to receive the second reflected light signal; the second critical angle is the critical angle at which the light signal emitted by the display pixel can undergo total internal reflection on the upper surface of the light-transmitting cover plate.

[0066] As an optional embodiment, the light screening component includes an optical device;

[0067] The light screening component is used to filter the reflected light signals and screen out the light signals within a preset angle range, and the sensing unit is used to receive the light signals screened out by the light screening component, including:

[0068] The optical device is used to filter the reflected light signals in the reflected light signals whose incident angle on the surface of the optical device is less than the second critical angle, so as to obtain the second reflected light signal, and the sensing unit is used to receive the second reflected light signal; the second critical angle is the critical angle at which the light signal emitted by the display pixel can undergo total internal reflection on the upper surface of the light-transmitting cover plate.

[0069] As an optional embodiment, the optical device is further adapted to make the second reflected light signal enter the sensing unit at an incident angle less than a preset angle.

[0070] As an alternative embodiment, the sensing unit is a light detection array film.

[0071] As an alternative embodiment, the light detection array film includes a plurality of pixel detection regions, and a pixel detection structure is correspondingly arranged in each pixel detection region. Each pixel detection structure includes a pixel thin film circuit composed of thin film transistors and a light detection unit.

[0072] As an alternative embodiment, the light detection unit includes a photodiode or a phototransistor.

[0073] As an alternative embodiment, the light detection array film is an array formed by photodiodes. The photodiode includes a photodiode sensing region, and a photodiode layer is arranged in the photodiode sensing region.

[0074] As an alternative embodiment, the photodiode layer includes a p-type semiconductor layer, an i-type semiconductor layer, and an n-type semiconductor layer. The p-type semiconductor layer, the i-type semiconductor layer, and the n-type semiconductor layer are stacked from top to bottom, and the i-type semiconductor layer is a microcrystalline silicon structure or a non-crystalline silicon germanide structure.

[0075] As an alternative embodiment, the light detection array film is an array formed by phototransistors. The phototransistor includes a phototransistor sensing region, and a photosensitive thin film transistor is arranged in the phototransistor sensing region.

[0076] As an alternative embodiment, the photosensitive thin film transistor includes a source electrode, a drain electrode, and a light absorption semiconductor layer; a photosensitive drain current channel is formed horizontally between the source electrode and the drain electrode, and the light absorption semiconductor layer is arranged in the photosensitive drain current channel.

[0077] As an alternative embodiment, the fingerprint recognition area includes a plurality of fingerprint recognition sub-areas, and a sensing unit is correspondingly arranged below each fingerprint recognition sub-area;

[0078] When the computer program is executed by the processor, the following steps are further implemented:

[0079] Receive a start instruction from the user for a fingerprint recognition sub-area, and turn on the sensing unit below the fingerprint recognition sub-area;

[0080] Alternatively, receive a close instruction from the user for a fingerprint recognition sub-area, and turn off the sensing unit below the fingerprint recognition sub-area.

[0081] As an alternative embodiment, the display unit is a self-luminous diode display screen.

[0082] As an alternative embodiment, the device further includes a touch screen;

[0083] The processor is configured to send a display driving signal to the display unit when a touch signal of a user's finger is detected by the touch screen;

[0084] The display pixels for emitting optical signals include:

[0085] When receiving the display driving signal sent by the processor, the display pixels emit optical signals.

[0086] As an optional embodiment, the processor is configured to generate and output physiological feature recognition image information according to the second reflected optical signal received by the sensing unit.

[0087] As an optional embodiment, the display screen includes a plurality of display pixels;

[0088] The processor is configured to perform signal superposition on the second reflected optical signals corresponding to the optical signals emitted by several groups of single display pixels or several groups of display pixel arrays, reconstruct complete physiological feature recognition image information and output it; each group of display pixel arrays includes a plurality of display pixels.

[0089] Different from the prior art, for the method and device for screen unlocking by synchronously verifying fingerprint information described in the above technical solution, the method includes: receiving the sliding trajectory of the user on the fingerprint recognition area, and synchronously collecting the fingerprint information corresponding to the user's finger; when it is detected that the sliding trajectory of the user on the fingerprint recognition area matches the preset sliding trajectory, determining whether the synchronously collected fingerprint information matches the preset fingerprint information, and if so, completing the screen unlocking, otherwise the screen unlocking fails. Among them, synchronously collecting the fingerprint information corresponding to the user's finger includes: the display pixels emit optical signals, the optical signals are reflected on the upper surface of the light-transmitting cover plate to form reflected optical signals; the light screening component filters the reflected optical signals to screen out the optical signals within a preset angular range; the sensing unit receives the optical signals screened out by the light screening component. By using the method of the present invention, the accuracy of the reconstructed fingerprint information can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0090] Figure 1 It is a schematic diagram of an application structure of an optical detection array film according to an embodiment of the present invention;

[0091] Figure 2 It is a schematic diagram of a display pixel of a self-luminous diode display screen according to an embodiment of the present invention;

[0092] Figure 3 It is a schematic diagram of the optical path change of a single display pixel emitting and reflecting light according to an embodiment of the present invention;

[0093] Figure 4Schematic diagram of the optical path change of a single display pixel emitting and reflecting light after setting the optical adhesive according to an embodiment of the present invention;

[0094] Figure 5 Schematic diagram of the optical path change of a single display pixel emitting and reflecting light after setting the optical adhesive and the optical device according to an embodiment of the present invention;

[0095] Figure 6 Schematic diagram of the effective light-emitting area corresponding to a single display pixel according to an embodiment of the present invention;

[0096] Figure 7 Schematic diagram of the structure of a screen unlocking device for synchronously verifying fingerprint information according to an embodiment of the present invention;

[0097] Figure 8 Flow chart of a method for collecting fingerprint information according to an embodiment of the present invention;

[0098] Figure 9 Schematic diagram of the structure of a light detection unit according to an embodiment of the present invention;

[0099] Figure 10 Schematic diagram of the structure of a light detection unit according to another embodiment of the present invention;

[0100] Figure 11 Schematic diagram of the structure of a source electrode and a drain electrode according to another embodiment of the present invention;

[0101] Figure 12 Flow chart of the preparation of a light detection unit according to another embodiment of the present invention;

[0102] Figure 13 Flow chart of a method for screen unlocking for synchronously verifying fingerprint information according to an embodiment of the present invention.

[0103] Reference numerals:

[0104] 1. Cover glass / touch screen;

[0105] 2. Self-luminous diode display screen; 21. Display pixel;

[0106] 3. Light detection array film; 31. Photosensitive pixel;

[0107] 4. Optical adhesive;

[0108] 5. Optical device;

[0109] 101. Gate; 102. Source electrode; 103. Drain electrode; 104. Insulating layer; 105. Light absorption semiconductor layer. Detailed implementation manners

[0110] To describe in detail the technical content, structural features, achieved objectives and effects of the technical solution, the following will be described in detail with reference to specific embodiments and in conjunction with the accompanying drawings.

[0111] As Figure 13 shown, the flowchart of a method for screen unlocking by synchronously verifying fingerprint information according to an embodiment of the present invention is shown. The method is applied to a device for screen unlocking by synchronously verifying fingerprint information, and the device includes a display unit and a sensing unit. The device is an electronic device with a touch display screen, such as a smart mobile device like a mobile phone, a tablet computer, a personal digital assistant, etc., and can also be an electronic device such as a personal computer or an industrial equipment computer.

[0112] A fingerprint recognition area is provided on the display unit, and the sensing unit is located below the fingerprint recognition area for acquiring fingerprint information on the fingerprint recognition area. The display unit is a display screen using an active matrix thin film transistor as a scanning driver and data transmitter, including an AMOLED display screen, an LCD liquid crystal display screen, a micro light emitting diode display screen, a quantum dot display screen, or an electronic ink display screen.

[0113] In this embodiment, the coverage range of the sensing unit is adapted to the size of the touch display screen, so that no matter how the user's finger slides on the display screen, the sensing unit can capture the user's fingerprint information. The sliding trajectory is the movement trajectory of the user's finger on the display unit, which can be a single-finger operation or a multi-finger operation. The movement trajectory of the user's finger includes but is not limited to lines, graphics, Chinese characters, etc. When the sliding trajectory is an operation by multiple fingers of the user, if multiple fingers are simultaneously within the fingerprint recognition area during the sliding process, the sensing unit will collect the fingerprint information corresponding to these fingers.

[0114] In some other embodiments, there can also be multiple sensing units, as long as multiple sensing units are spliced into a size adapted to the display unit and placed below the display unit. Compared with a large-area sensing unit, a small area is easier to produce and process, which is conducive to saving production costs.

[0115] In some other embodiments, preferably, the fingerprint recognition area may also be an area smaller than the display screen size, such as occupying 1 / 2 or 1 / 4 of the overall display screen size. Preferably, the shape of the fingerprint recognition area is rectangular, and the size of the rectangle is located at the center of the display unit, and the size of the sensing unit is adapted to the size of the fingerprint recognition area. In this embodiment, when the user's finger slides on the display screen, if the finger is outside the fingerprint recognition area, the fingerprint information will not be recognized because the sensing unit is not provided in the area outside the fingerprint recognition area; when the user's finger slides into the fingerprint recognition area, the sensing unit will capture the user's fingerprint information. Since the sensing unit only occupies a part of the area of the display unit, compared with the full-screen coverage method, the production cost can be effectively saved.

[0116] The method includes the following steps:

[0117] First, enter step S1301 to receive the sliding trajectory of the user on the fingerprint recognition area and synchronously collect the fingerprint information corresponding to the user's finger.

[0118] In some embodiments, the display unit includes a touch control unit; the step "receiving the sliding trajectory of the user's finger on the display unit" includes: the sensing unit or the touch control unit receives the sliding trajectory of the user's finger on the display unit, generates sliding trajectory information, and stores the sliding trajectory information. The touch control unit may be a touch screen, and the touch screen can be used to sense the touch operation of the user thereon, and the touch operation includes a sliding trajectory operation. The sliding trajectory information and the fingerprint information can both be obtained by the sensing unit, or the sliding trajectory information can be recognized by the touch control unit and the fingerprint information can be captured by the sensing unit. In short, for a terminal with a touch screen, the sliding trajectory information is captured by the sensing unit or the touch control unit, effectively improving the application range of the device.

[0119] Then enter step S1302 to determine whether the detected sliding trajectory of the user on the fingerprint recognition area matches the preset sliding trajectory. If so, enter step S1303 to determine whether the synchronously collected fingerprint information matches the preset fingerprint information. If so, enter step S1304 to complete the screen unlocking. If the sliding trajectory does not match the preset sliding trajectory, or the collected fingerprint information does not match the preset fingerprint information, enter step S1305 and the screen unlocking fails.

[0120] The preset fingerprint information is the fingerprint information pre-entered and stored by the user, and is used to compare with the fingerprint information collected when the user performs the screen unlocking operation. The preset fingerprint information can be stored in the storage unit of the device, such as the memory of a mobile phone or the hard disk of a computer, or can be stored in the storage unit of the server. When it is necessary to obtain the preset fingerprint information, only need to establish a communication connection between the device and the server, and then obtain the preset fingerprint information from the server. The communication connection includes a wired communication connection or a wireless communication connection.

[0121] The comparison of fingerprint information can be realized through a fingerprint recognition algorithm. The fingerprint recognition algorithm can be stored in the storage unit of the device. After the sensing unit collects the fingerprint information on the fingerprint recognition area, the processor of the device calls the fingerprint recognition algorithm in the storage unit to compare the synchronously collected fingerprint information with the preset fingerprint information, and then judges whether the two match. The fingerprint recognition algorithm includes steps such as preprocessing the fingerprint image, extracting data features, feature matching, and fingerprint recognition, and can be realized by a variety of algorithms. These algorithms are all mature existing technologies and have been applied to various encryption and decryption fields, so they will not be elaborated here.

[0122] In this embodiment, the method further includes: when it is determined that the sliding trajectory does not match the preset sliding trajectory, or the collected fingerprint information does not match the preset fingerprint information, a prompt message is issued. The prompt message includes one or more of a sound prompt message, an image prompt message, a light prompt message, and a video prompt message. Taking the non-matching of fingerprint information as an example, "the collected fingerprint information does not match the preset fingerprint information" usually includes the following two situations: one is that the fingerprint recognition fails, that is, the fingerprint information is pre-stored in the storage unit, but when synchronously collecting the user's fingerprint information, since the contact between the user's finger tip and the screen is not sufficient, the collected fingerprint information is not complete enough, resulting in the failure of fingerprint recognition; the other situation is that there is no preset fingerprint information matching the fingerprint information stored in the storage unit.

[0123] For the first situation, when the device fails to recognize the preset fingerprint information matching the synchronously collected fingerprint information, a sound prompt message or an image prompt message will be issued. The sound prompt message includes a voice prompt message for prompting the user to input the fingerprint again (such as performing a screen sliding operation again), and the image prompt message includes a pop-up window prompt message for prompting the user to input the fingerprint again (such as performing a screen sliding operation again). When the number of times of synchronously collecting the user's input fingerprint information exceeds the preset number of times and no preset fingerprint information matching the synchronously collected fingerprint information is recognized, it is determined that there is no preset fingerprint information matching the fingerprint information stored in the storage unit, that is, the other situation mentioned above.

[0124] For the second case, that is, when there is no preset fingerprint information stored in the storage unit that matches the fingerprint information, the device can also issue an image prompt message, such as a pop-up window to prompt the user that the current fingerprint information has not been entered; it can also issue a video prompt message, and the video prompt message contains a tutorial on how to enter new fingerprint information. The user can complete the entry of new fingerprint information based on the video prompt message. Of course, the prompt message can also be implemented by means of vibration, light sensor prompt, etc. In short, the prompt message is only to enable the user to quickly understand the situation of "there is no fingerprint information that matches the fingerprint information collected synchronously this time", and the choice of the form of the prompt message can be adjusted accordingly according to the settings of different manufacturers.

[0125] In some embodiments, when the display unit is an LCD liquid crystal display screen or an electronic ink display screen, a backlight unit is further provided below the sensing unit, and the sensing unit is disposed between the backlight unit and the LCD liquid crystal display screen, or between the backlight unit and the electronic ink display screen. Since the LCD liquid crystal display screen is not a self-luminous element, a backlight unit needs to be added below the sensing unit during installation. The backlight unit can be an LCD backlight module or other electronic components with self-luminous functions. In other embodiments, when the display unit is an AMOLED display screen, since the OLED display screen is a self-luminous element, there is no need to provide a backlight unit. By setting the above two solutions, the production requirements of different manufacturers can be effectively met, and the applicable range of the terminal can be improved.

[0126] In some embodiments, the fingerprint recognition area includes a plurality of fingerprint recognition sub-areas, and a sensing unit is correspondingly provided below each fingerprint recognition sub-area. The device further includes a sensing unit control circuit, and the method further includes: receiving a start instruction of the user for the fingerprint recognition sub-area, and the sensing unit control circuit turns on the sensing unit below the fingerprint recognition sub-area, and receiving a close instruction of the user for the fingerprint recognition sub-area, and the sensing unit control circuit turns off the sensing unit below the fingerprint recognition sub-area.

[0127] Taking the number of fingerprint recognition areas as two as an example, the two fingerprint recognition sub-areas can be evenly distributed in the screen, one above the other or one on the left and one on the right, or they can be distributed in the screen in other arrangements. The following is a specific description of the application process of a terminal with two fingerprint recognition sub-areas: During use, a startup signal triggered by the user is received, and the light detection devices (i.e., sensing units) below the two fingerprint recognition sub-areas are both set to the on state. In a preferred embodiment, the range formed by the two fingerprint recognition sub-areas covers the entire display screen, so that when the light detection devices below the two fingerprint recognition sub-areas are both set to the on state, the light signal entering the display screen can be absorbed by the TFT image sensing array film (i.e., sensing unit) below, thereby capturing the user's fingerprint information.

[0128] In other embodiments, the range formed by the two fingerprint recognition sub-areas can also account for 2 / 3, 3 / 4, etc. of the entire display screen area. Of course, the user can also, according to their own preferences, set the light detection device below one fingerprint recognition sub-area to be on and the light detection device below the other fingerprint recognition sub-area to be off. When there is no need to operate the terminal, the light detection devices below the two fingerprint recognition sub-areas can also be set to the off state. In short, whether the light detection devices below each fingerprint recognition sub-area are on or off can be set according to the user's own preferences.

[0129] As Figure 1 shown, the touch display screen includes a cover glass, a touch screen, and a self-luminous diode display pixel combination from top to bottom. A light detection array film (i.e., sensing unit) can be placed below the touch display screen to realize the detection and recognition of the user's physiological characteristics (such as fingerprint information). Taking fingerprint recognition as an example, Figure 1 The structure shown has at least the following problems when realizing fingerprint information collection: (1) After the display pixels directly below the finger irradiate the finger, different optical phenomena such as light penetration, light reflection, and light scattering will occur on the upper surface of the cover glass. Whether it is the convex or concave pattern of the fingerprint, the truly effective reflected light signals that can form bright and dark are very weak, and it is even more difficult to distinguish the convex or concave pattern of the fingerprint; (2) Limited by the materials and related thicknesses of the structures such as the cover glass, the touch screen, and the display screen, even if the reflected light signal is strong enough, when it passes through the cover glass, the touch screen, and the display screen and reaches the light detection array film, the light intensity has been severely weakened (usually reduced by more than 95%), and at the same time, the reflected light signal will also undergo optical distortion when passing through the TFT openings of the display screen, affecting the collection of fingerprint information; (3) The light emission collimation of each display pixel of the self-luminous diode display screen is low, that is, the emission angle is very wide, and these large-angle emissions are likely to interfere with the fingerprints to be irradiated by the light sources of adjacent or spaced pixels, resulting in inaccurate fingerprint information collection.

[0130] In order to solve the problem that when the above-mentioned light detection structure detects physiological characteristic information, the intensity of the reflected light signal entering the light detection array film is severely reduced, resulting in unclear distinction of the captured physiological characteristic information patterns and inaccurate information collection, the present invention provides a screen unlocking device for synchronously verifying fingerprint information, which can be used to detect and identify physiological characteristic information, such as fingerprints, palm prints, etc.

[0131] like Figure 7 As shown, the device includes, from top to bottom, a cover glass, a touch screen, a self-luminous diode display screen 2, an optical glue 4, an optical device 5, and a light detection array film 3; the touch screen is attached to the lower surface of the cover glass, and the optical glue 4 is attached to the lower surface of the self-luminous diode display screen 2; the refractive index of the optical glue 4 is less than that of the cover glass, and the self-luminous diode display screen includes a plurality of display pixels. For ease of description, all the drawings of the present invention simplify the cover glass and the touch screen as one, recorded as the cover glass / touch screen 1, and when describing the change of the light path, the change of the light path on the surface of the cover glass / touch screen 1 is simplified to the change of the light path on the surface of the cover glass.

[0132] When the light detection array film is arranged under the display structure, a single display pixel or a display pixel array (which can be a row or a column of display pixels, or multiple display pixels arranged in a periodic or non-periodic manner) is used as a light source to illuminate the fingerprint above the cover glass, and the light will be reflected. Since most of the light irradiated to the fingerprint ridges is absorbed by the ridged skin, and the air gap between the grooves and the cover glass can partially reflect the light irradiated to the grooves, the photosensitive pixels of the light detection array film can receive the different light and dark features of the fingerprint grooves, and the light detection array film can reconstruct the ridge and groove images of the fingerprint according to the light and dark features shown by the reflected light signal.

[0133] See also Figure 2 The display screen of the present invention is a self-luminous diode display screen. As the name implies, it is a display screen composed of a self-luminous diode pixel array, such as an organic light emitting diode (OLED) display screen, a micro-light emitting diode (micro-LED) display screen, etc. The display screen includes MxN display pixels. In order to facilitate a detailed description of the optical path changes of the light signal emitted by each display pixel, the present invention records the display pixel of the Nth row and the Mth column on the display screen as Pmn, and the optical path changes of other display pixels can be obtained similarly. In order to better describe the optical path changes of the display pixels, the thickness of the self-luminous diode display screen involved in the present invention is less than 1 / 10 of the thickness of the cover glass, and the refractive index of the display screen and the cover glass are relatively close. Therefore, when calculating the optical path changes, the changes in the reflected light signal on the surface of the display screen can be ignored compared to the cover glass, so as to simplify the description.

[0134] Please refer to Figure 3 , which is a schematic diagram of the optical path change of the light emission and reflection of a single display pixel involved in an embodiment of the present invention. Figure 3 The upper circle in it represents a top view of a light beam emitted by a single display pixel Pmn with a cross-sectional radius less than R C , and the radius is R C The incident angle of the light ray with a radius of R corresponding to the upper surface of the cover glass is θc, as shown in Figure 3 the position corresponding to the dotted line in it.

[0135] Since the refractive index n2 of the cover glass is approximately 1.5 and the refractive index n1 of air is approximately 1.0, when the light source of the (m, n)th display pixel irradiates upward at a large angle, the light rays with an incident angle θ greater than θc (θc = sin -1 (n1 / n2)) on the cover glass surface will undergo total internal reflection. Assuming that the projection length of θc corresponding to the r-axis of the circular coordinate is Rc, the light rays outside the dotted circle with the position Pmn of the (m, n)th light-emitting display pixel as the origin and Rc as the radius are the light rays that can undergo total internal reflection on the upper surface of the cover glass. When the light rays with an incident angle greater than θc on the upper surface of the cover glass irradiate the convex ridges of the fingerprint in contact with the upper surface of the cover glass, since the refractive index of the convex ridge skin has destroyed the original total internal reflection condition, the reflection signal at the relative convex ridge position cannot undergo total internal reflection within the cover glass, causing part of the reflected light signal to enter the light detection array film through the lower surface of the cover glass to form bright stripes. Relatively, due to the air gap between the concave ridges of the fingerprint and the cover glass, the reflected light signal at the concave ridge position will maintain total internal reflection and cannot reach the light detection array film to form dark stripes.

[0136] In short, compared with the light rays within Figure 3 the dotted circle, that is, the light rays with an incident angle greater than θc on the upper surface of the cover glass, they are more capable of detecting the fingerprint concave ridge area with an air gap. Therefore, for an effective optical fingerprint recognition technology under the display screen, it is necessary to use Rc as the characteristic dimension and irradiate or scan the finger part on the cover glass with an effective light illumination combination to obtain a highly sensitive reflection area for the fingerprint image. Assuming the thickness of the touch cover glass is h, then Rc = h·tan(θc).

[0137] When the light beam emitted by the light source of the (m, n)th display pixel on the display screen irradiates upward at a large angle, although the incident angle θ of the rays irradiating the upper surface of the cover glass is greater than θc (θc = sin -1(n1 / n2)), there will be a more accurate total reflection for the fingerprint indentations separated by an air gap. However, for too large an incident angle on the surface of the cover glass, the optical path of the light that is totally reflected back to the light detection array film becomes longer and longer, which will result in a more serious attenuation of the useful optical image information. When this part of the reflected light signal reaches the light detection array film, it has become noise interference without reference value. Therefore, it is also necessary to define the (m,n)th display pixel as the light detection range of the maximum available information when the light source irradiates the fingerprint above the cover glass.

[0138] In some embodiments, the light screening component includes an optical device; the optical device is configured to filter the reflected light signals with an incident angle less than a second critical angle on the surface of the optical device in the reflected light signals to obtain a second reflected light signal. The light detection array film is used to receive the second reflected light signal. The second critical angle is the critical angle at which the light signal emitted by the display pixel can undergo total reflection on the upper surface of the light-transmitting cover plate. If the incident angle of the reflected light signal on the surface of the optical device is less than the second critical angle, it indicates that the reflectivity of this part of the reflected light signal on the surface of the light-transmitting cover plate is relatively low, and a total reflected light signal cannot be formed at the interface between the light-transmitting cover plate and the fingerprint, and the light intensity is weak, making it difficult to be an effective light signal for detecting physiological characteristic information. And in this application, by setting the optical device to filter the reflected light signals incident on the surface of the optical device, the reflected light signals with an incident angle less than the second critical angle on the surface of the optical device are filtered out to obtain a second reflected light signal. The second reflected light signal includes: the total reflected light signal formed by the total reflection of the light signal corresponding to the display pixel on the surface of the light-transmitting cover plate in the reflected light signal. The light detection array film can generate physiological characteristic information based on the second reflected light signal, which can effectively improve the accuracy of the reconstructed physiological characteristic information.

[0139] Please refer to Figure 4, in some embodiments, the light screening component includes an optical adhesive for filtering the reflected light signals with an incident angle greater than the first critical angle in the optical adhesive in the reflected light signals to obtain a first reflected light signal; the light detection array thin film is further configured to receive the first reflected light signal. The first critical angle is the critical angle at which the reflected light signal can undergo total internal reflection on the surface of the optical adhesive. In the present application, the refractive index of the optical adhesive is less than the refractive index of the transparent cover plate. The first reflected light signal obtained after being filtered by the optical adhesive filters out the light signals with too long reflection paths, and the light detection array thin film can generate physiological characteristic information based on the first reflected light signal, which can effectively improve the accuracy of the reconstructed physiological characteristic information. In addition, by adopting this solution, by storing and utilizing the effective data that can better reflect the physiological characteristic information and filtering out some data with too long optical paths, the storage space and computing power can be saved.

[0140] Please refer to Figure 4 and Figure 5 , the optical adhesive 4 can be attached to the lower surface of the display unit (such as the self-luminous diode display screen 2). Since the refractive index (n3) of the optical adhesive is less than the refractive index (n2) of the cover glass, total internal reflection (hereinafter referred to as "total reflection 1") occurs on the upper surface of the cover glass, and the corresponding total reflection critical angle is the second critical angle θc = sin -1 (n1 / n2). Among the light rays entering the surface of the optical adhesive, the rays with an incident angle φ greater than φc will undergo total internal reflection (hereinafter referred to as "total reflection 2") on the surface of the optical adhesive, and the corresponding total reflection critical angle is the first critical angle φc = sin -1 (n3 / n2). Assuming that the projection length of φc on the r-axis of the circular coordinate is Rc' = h·tan(φc), the light rays outside the dashed circle with a radius of 2Rc' centered at the position Pmn of the (m,n)-th display pixel are the light rays that can undergo total internal reflection 2 on the surface of the optical adhesive. For the light rays that can undergo total internal reflection 2 on the surface of the optical adhesive, compared with the light rays within the dashed circle with a radius of 2Rc', since the reflection light signal path is too long and no longer carries the light rays with high-precision fingerprint information, they will be filtered out by the optical adhesive with a refractive index n3 < n2 in the form of total internal reflection 2.

[0141] Comprehensively Figure 4 and Figure 5It can be seen that for a single display pixel, the light beams that can undergo total reflection 1 and total reflection 2 in the emitted light beams are optical signals corresponding to fingerprint information with high precision. Based on this, when implementing the under-screen fingerprint recognition technology, it can be defined that after irradiating the fingerprint with the (m,n)-th display pixel of the self-luminous diode display screen as the light source, the optical detection array film can collect relatively sensitive and effective fingerprint areas, which are the dotted concentric circular belt beam areas with the position Pmn of the (m,n)-th display pixel as the origin and the range from Rc to 2Rc' as the radius. If projected onto the r direction of the circular coordinate, it is the area range of Rc < r < 2Rc', which is the most suitable fingerprint optical information that the optical detection array film can obtain from the light source emitted by a single display pixel of the self-luminous diode display screen, as specifically shown in Figure 6 shown.

[0142] For the light rays outside the area greater than 2Rc', as described above, an optical adhesive with a corresponding refractive index can be used for filtering, that is, the light rays outside the area greater than 2Rc' undergo total reflection on the surface of the optical adhesive and do not enter the optical detection array film, thereby affecting the acquisition of the fingerprint information image. For the light rays in the area less than Rc, the present invention filters them by setting an optical device above the optical detection array film. In this embodiment, the optical device 5 includes a light-shielding optical device and a phase-changing optical device. The light-shielding optical device includes a periodic pinhole array or a non-periodic pinhole array, and the phase-changing optical device includes a photonic crystal structure or a microlens array structure with a periodically changing refractive index, or a diffuse scattering structure with a non-periodically changing refractive index.

[0143] Preferably, the shape of the pinhole can be a round hole or a square hole. The optical device can be obtained by the compressive sampling method of a coded aperture. Taking fingerprint recognition as an example, for the application requirement of only two gray levels of bright and dark in fingerprint information recognition, through the filtering design of spatial frequency (in this embodiment, specifically, it is necessary to filter the light rays with θ < θc and θ > φc when the display pixels irradiate the cover glass surface), the coded aperture of the optical device is designed as a device with a light guiding function, which can achieve high-resolution bright and dark light signal extraction in the region of Rc < r < 2Rc', and make the reflected light signal passing through the optical device enter the light detection array film in the most vertical direction (the incident angle is less than the preset angle). The references for the compressive sampling method of the coded aperture are as follows: "Coded apertures: past, present, and future application and design" by Stephen R. Gottesman (Proceedings of SPIE, Vol. 6714, 2007). This article illustrates with a simple one-dimensional model that the coded aperture can be widely applied to the design method of thin optical devices requiring high resolution and wide viewing angle. In short, through the compressive sampling method of the coded aperture, an appropriate optical device can be designed according to the predetermined parameter requirements (that is, it is required to filter the light rays in the region of r < Rc after passing through the optical device). The specific steps are prior art and will not be elaborated here.

[0144] In some other embodiments, the optical device can also be designed by digital holography. Through digital holography (or computer-generated holography), an appropriate optical device can be designed according to the predetermined parameter requirements (that is, it is required to filter the light rays in the region of r < Rc after passing through the optical device). The specific steps can refer to the following literature: M. A. Seldowitz, J. P. Allebach, and D. W. Sweeney, "Synthesis of digital holograms by direct binary search," Appl. Opt. 26, 2788–2798 (1987). This literature proposes that a computer can be used to design the corresponding digital holographic optical device with a specific algorithm, and then achieve a high-resolution output image.

[0145] In this embodiment, the device includes, from top to bottom, a cover glass, a touch screen, a self-emitting diode display screen, an optical adhesive, an optical device, and a light detection array film; the touch screen is attached to the lower surface of the cover glass, and the optical adhesive is attached to the lower surface of the self-emitting diode display screen; the refractive index of the optical adhesive is less than that of the cover glass, and the self-emitting diode display screen includes a plurality of display pixels; the device further includes a processor; the method includes the following steps:

[0146] First, enter step S801. When the processor detects a touch signal of a user's finger on the touch screen, it sends a display drive signal to the self-emitting diode display screen. Taking fingerprint information recognition as an example, when the touch screen detects that the user's finger is placed on the upper surface of the cover glass, the touch signal is triggered.

[0147] Then, enter step S802. When the display pixel receives the display drive signal from the processor, it emits an optical signal. The optical signal is reflected on the upper surface of the cover glass to form a reflected optical signal. Since the display screen and the cover glass have a certain light transmittance, the optical signal emitted by the display pixel will not only be reflected but also transmitted on the upper surface of the cover glass, that is, it directly passes through the upper surface of the cover glass and enters the air. Only the optical signal reflected on the upper surface of the cover glass will finally enter the light detection array film and then form a corresponding image signal. Therefore, the present invention further screens and processes the reflected optical signal.

[0148] Then, enter step 803. The optical adhesive changes the optical path of the reflected optical signal, filters the reflected optical signal with an incident angle greater than the first critical angle in the optical adhesive to obtain a first reflected optical signal, and makes the first reflected optical signal enter the optical device. The first critical angle is the critical angle at which the reflected optical signal can undergo total internal reflection (i.e., the second total internal reflection) on the surface of the optical adhesive. In short, by using an optical adhesive with a refractive index less than that of the cover glass, the optical signal with an overly long optical path is filtered, that is, the light rays in the region of r > 2Rc'.

[0149] Then, enter step S804. The optical device changes the optical path of the first reflected optical signal, filters the first reflected optical signal with an incident angle less than the second critical angle on the surface of the optical device to obtain a second reflected optical signal, and makes the second reflected optical signal enter the sensing unit (i.e., the light detection array film) at an incident angle less than a preset angle. The second critical angle is the critical angle at which the reflected optical signal can undergo total internal reflection (i.e., the first total internal reflection) on the upper surface of the cover glass. In short, by using the optical device to filter the light rays in the region of r < Rc and making the light rays passing through the optical device (the radius r of the light rays corresponding to the coordinate axis satisfies Rc < r < 2Rc') enter the light detection array film as vertically as possible, the light flux is increased so that the fingerprint feature information can be better captured.

[0150] Then, it enters step S805, where the processor generates fingerprint information based on the second reflected light signal received by the optical detection array film and outputs it. That is, for each light beam emitted by a display pixel, the light beams within the range of Rc < r < 2Rc' are extracted, and then the light signals of each display pixel within this area are signal - superimposed to reconstruct the complete physiological feature recognition image information (such as fingerprint image information) and output it.

[0151] In some embodiments, the display screen includes MxN display pixels, and the method includes: the processor sequentially drives a single display pixel or a display pixel array on the display screen to emit light signals according to a preset timing electrical signal, so as to form a light spot or a combination of light spots on the upper surface of the cover glass to scan the fingerprint feature part and form a reflected light signal. For example, the first row of display pixels on the display screen is P 11 , P 12 …P 1N , the second row is P 21 , P 22 …P 2N , and so on. The Nth row is P M1 , P M2 …P MN . Through the preset timing electrical signal, the processor can drive the display pixels on the display screen row - by - row or column - by - column, or drive periodically - changing discrete display pixels (such as first driving the first row P 11、 P 13、 P 15 , then driving the second row P 21、 P 23、 P 25 , then driving the third row P 31、 P 33、 P 35 , and so on), and of course, it can also drive multiple non - periodically - arranged display pixels in sequence. In short, the order of driving each display pixel on the display screen can be selected according to actual needs.

[0152] In some embodiments, the optical detection array film includes PxQ pixel detection areas, and each pixel detection area is correspondingly provided with a pixel detection structure. Each pixel detection structure includes a group of pixel thin - film circuits composed of more than one thin - film transistor and an optical detection unit; the optical detection unit includes a photosensitive diode or a photosensitive transistor. For each optical detection unit, there are the following implementation methods:

[0153] Embodiment 1:

[0154] The TFT image sensing array film (i.e., the light detection array film) is an array formed by photosensitive diodes, and the array formed by the photosensitive diodes includes photosensitive diode sensing regions. In existing liquid crystal display (LCD) panels or organic light-emitting diode (OLED) display panels, the TFT structure is used to drive and scan a single pixel to achieve the display function of the pixel array on the panel. The main structure for forming the TFT switching function is a semiconductor field-effect transistor (FET). Well-known semiconductor layer materials mainly include amorphous silicon, polycrystalline silicon, indium gallium zinc oxide (IGZO), or organic compounds mixed with carbon nanomaterials, etc. Since the structure of the light-sensing diode can also be prepared using such semiconductor materials, and the production equipment is also compatible with the production equipment of the TFT array, in recent years, TFT light-detection diodes (i.e., photosensitive diodes) have begun to be produced in the preparation method of the TFT array. The specific structure of the existing photosensitive diodes can refer to the descriptions of the light detection array film structure in US Patent US6943070B2 and Chinese Patent CN204808361U. The difference between the production process of the TFT image sensing array film and the TFT structure of the display panel is that: the pixel opening area in the original display panel is changed to a light-sensing area in the production process. Its TFT preparation method can use thin glass as the substrate, or a high-temperature resistant plastic material as the substrate, as described in US Patent US6943070B2.

[0155] The existing TFT image sensing array film is easily affected by factors such as reflection and refraction of ambient light or visible light emitted by the display screen pixels, resulting in optical interference, seriously affecting the signal-to-noise ratio (SNR) of the TFT image sensing array film embedded under the display panel. In order to improve the signal-to-noise ratio, as Figure 9 shown, the light detection unit of the present invention has been further improved, so that the improved TFT image sensing array film can detect and identify the infrared signal reflected back by the user's body part. The specific structure is as follows:

[0156] The photosensitive diode layer includes a p-type semiconductor layer, an i-type semiconductor layer, and an n-type semiconductor layer. The p-type semiconductor layer, the i-type semiconductor layer, and the n-type semiconductor layer are stacked from top to bottom. The i-type semiconductor layer is a microcrystalline silicon structure or an amorphous silicon germanide structure. The microcrystalline silicon structure is a semiconductor layer formed by chemical vapor deposition of silane and hydrogen. The crystallinity of the microcrystalline silicon structure is greater than 40%, and its bandgap width is less than 1.7 eV. The amorphous silicon germanide structure is an amorphous semiconductor layer formed by chemical vapor deposition of silane, hydrogen, and germane, and its bandgap width is less than 1.7 eV.

[0157] The band gap refers to a band gap width (unit: electron volt (eV)). The energy of electrons in a solid cannot take continuous values but rather exists in some discontinuous energy bands. For conduction to occur, free electrons must be present. The energy band in which free electrons exist is called the conduction band (capable of conducting electricity). For a bound electron to become a free electron, it must acquire sufficient energy to transition from the valence band to the conduction band, and the minimum value of this energy is the band gap. The band gap is an important characteristic parameter of a semiconductor, and its magnitude mainly depends on the energy band structure of the semiconductor, that is, it is related to the crystal structure and the nature of atomic bonding, etc.

[0158] At room temperature (300K), the band gap of germanium is approximately 0.66 eV. Germanium is contained in silane. When germanium is doped, the band gap of the i-type semiconductor layer will decrease. When it is less than 1.7 eV, it indicates that the i-type semiconductor layer can receive optical signals in the wavelength range from visible light to infrared light (or near-infrared light). By adjusting the concentration of GeH4 in chemical vapor deposition, the operating wavelength range of a photosensitive diode with an amorphous or microcrystalline silicon germanium structure can be extended to the range of optical wavelengths from 600 nm to 2000 nm.

[0159] Example 2:

[0160] On the basis of adopting Example 1, in order to improve the quantum efficiency of photoelectric conversion, an amorphous silicon photodiode can also be formed by stacking more than two p-type / i-type / n-type structures. The p-type / i-type / n-type materials of the first junction layer of the photodiode are still in an amorphous silicon structure, and the p-type / i-type / n-type materials above the second junction layer can be in a microcrystalline structure, a polycrystalline structure, or a compound material doped with a compound capable of expanding the photosensitive wavelength range. In short, multiple groups of p-type / i-type / n-type structures can be stacked up and down to form a photosensitive diode structure. For each p-type / i-type / n-type structure, the photosensitive diode structure described in Example 1 is adopted.

[0161] Example 3:

[0162] On the basis of adopting Embodiment 1 or Embodiment 2, for each p-type / i-type / n-type structure, the p-type semiconductor layer it contains can be a multi-layer structure with more than two layers. For example, the p-type semiconductor layer is a three-layer structure, including a first p-type semiconductor layer (p1 layer), a second p-type semiconductor layer (p2 layer), and a third p-type semiconductor layer (p3 layer) from top to bottom. Among them, the p1 layer can adopt an amorphous structure and be heavily doped with boron (the boron concentration is more than twice that of the standard process); the p2 and p3 layers adopt a microcrystalline structure and are normally doped with boron (doped according to the standard process concentration). By relying on the thickness-thinned p2 layer and p3 layer, the absorption of light is reduced, so that as much light as possible enters the i layer and is absorbed by the i layer, improving the photoelectric conversion efficiency; on the other hand, the normal boron doping of the p2 layer and p3 layer can effectively avoid the degradation of the built-in potential due to the heavy doping of the p1 layer. When the p-type semiconductor layer includes multi-layer structures with other numbers of layers, it is similar and will not be elaborated here.

[0163] Similarly, the n-type semiconductor layer can also be a multi-layer structure with more than two layers. For example, the n-type semiconductor layer is a three-layer structure, including a first n-type semiconductor layer (n1 layer), a second n-type semiconductor layer (n2 layer), and a third n-type semiconductor layer (n3 layer) from top to bottom. Among them, the n3 layer can adopt an amorphous structure and be heavily doped with phosphorus (the phosphorus content is more than twice that of the standard process); the n1 and n2 layers adopt a microcrystalline structure and are normally doped with phosphorus (according to the standard production process). By relying on the thickness-thinned n1 layer and n2 layer, the absorption of light is reduced, so that as much light as possible enters the i layer and is absorbed by the i layer, improving the photoelectric conversion efficiency; on the other hand, the normal phosphorus doping of the n1 layer and n2 layer can effectively avoid the degradation of the built-in potential due to the heavy doping of the n3 layer. When the n-type semiconductor layer includes multi-layer structures with other numbers of layers, it is similar and will not be elaborated here.

[0164] Embodiment 4:

[0165] The TFT image sensing array film (i.e., the light detection array film) is an array formed by photosensitive transistors. The array formed by the photosensitive transistors includes a photosensitive transistor sensing area, and a photosensitive thin-film transistor is arranged in the photosensitive transistor sensing area. As Figure 10As shown, the photosensitive thin film transistor includes a gate 101, a source 102, a drain 103, an insulating layer 104, and a light-absorbing semiconductor layer 105; the photosensitive thin film transistor has an inverted coplanar structure, and the inverted coplanar structure includes: the gate 101, the insulating layer 104, and the source 102 are arranged longitudinally from bottom to top, and the drain 103 is arranged coplanarly with the source 102 horizontally; the insulating layer 104 wraps the gate 101 so that there is no contact between the gate 101 and the source 102 and between the gate 101 and the drain 103; the source 102 and the drain 103 are in clearance fit, and a photosensitive leakage current channel is formed horizontally between the source 102 and the drain 103, and the light-absorbing semiconductor layer 105 is arranged in the photosensitive leakage current channel.

[0166] Generally, when the TFT operation is controlled by the gate voltage in the off state, no current will pass between the source and the drain; however, when the TFT is irradiated by light, due to the energy of light exciting electron-hole pairs in the semiconductor, the field effect of the TFT structure will separate the electron-hole pairs, thereby causing the TFT to generate a photosensitive leakage current. Such a photosensitive leakage current characteristic enables the TFT array to be applied in light detection or light detection technologies. Compared with the devices that generally use the TFT leakage current as the photosensitive thin film transistor, the present invention configures the light-absorbing semiconductor layer on the uppermost light-absorbing layer in the inverted coplanar field effect transistor structure, greatly increasing the excitation of photo-electrons and improving the photoelectric conversion efficiency.

[0167] As Figure 12 shown, it is a flowchart of a method for preparing a light detection unit according to an embodiment of the present invention. The method is used to prepare the photosensitive thin film transistor (i.e., the light detection unit) of Example 6, and specifically includes the following steps:

[0168] First, enter step S1201 to deposit the gate on the substrate of the pixel thin film transistor by magnetron sputtering coating. The substrate of the pixel thin film transistor can be a hard board or a flexible material (such as polyimide);

[0169] Then enter step S1202 to deposit the insulating layer above the gate by chemical vapor deposition or magnetron sputtering coating;

[0170] Then enter step S1203 to deposit the n-type doped semiconductor layer of the source and the drain above the insulating layer by chemical vapor deposition coating, and deposit the metal layer of the source and the drain by magnetron sputtering coating, and define the source and the drain with a preset structure through a yellow light etching process, so that the source and the drain are horizontally coplanar and in clearance fit, and a photosensitive leakage current channel is formed horizontally between the source and the drain;

[0171] Then enter step S1204 to deposit the light-absorbing semiconductor layer in the photosensitive leakage current channel by chemical vapor deposition coating.

[0172] Example 5:

[0173] In the case of a well-known field-effect transistor structure, the TFT used as a scan driver and a data transmission switch does not need to be specifically designed for the structure that collects photocurrent between the source and the drain; however, for the application of a field-effect transistor in the detection of photosensitive leakage current, if the electron-hole pairs excited by light are field-effect separated and the drift path driven by the electric field is too long, it is very likely that recombination with holes occurs before the photo-electrons can reach the electrode smoothly, or they are trapped by the dangling bond defects of the photo-absorbing semiconductor layer itself, and cannot effectively contribute to the photocurrent output for photo-detection. In order to improve the influence of the photosensitive leakage current on the channel length between the source and the drain, so as to achieve the purpose of increasing the area of the light-absorbing semiconductor without degrading the photoelectric conversion efficiency, in this embodiment, a further improvement is made to the source and the drain of Example 4, and a new structure of the source and the drain is proposed.

[0174] As Figure 11 shown, the number of the source and the drain is multiple, the sources are connected in parallel with each other, and the drains are connected in parallel with each other; there is a clearance fit between the source and the drain, and a photosensitive leakage current channel is formed horizontally between the source and the drain, including: a first gap is formed between adjacent sources, and a drain is disposed in the first gap; a second gap is formed between adjacent drains, and a source is disposed in the second gap, and the source and the drain are arranged alternately and have a clearance fit. The distance between each source and the adjacent drain is less than the electron drift distance, and the electron drift distance is the distance that an electron can survive under the field effect. In this way, in each detection pixel, multiple sources belonging to the same pixel are connected in parallel with each other, and multiple drains belonging to the same pixel are also connected in parallel with each other, which can effectively reduce the probability of recombination of photo-excited electrons and holes, improve the success probability of the electrode collecting photo-electrons under the field effect, and maximize the photosensitivity of the TFT leakage current photosensitive thin-film transistor.

[0175] In the process of gradually fabricating the photosensitive thin-film transistor (i.e., the light detection unit) of Example 5, the general steps are similar to those of fabricating the photosensitive thin-film transistor of Example 4. The difference lies in that when fabricating the source and drain electrodes, in step S1203, "defining the source and drain electrodes with a preset structure through a yellow light etching process, resulting in the source and drain being laterally coplanar and having a clearance fit, and forming a photosensitive leakage current channel between the source and drain laterally" includes: defining a source electrode group and a drain electrode group through a yellow light etching process, each source electrode group including multiple sources that are connected in parallel with each other; each drain electrode group including multiple drains that are connected in parallel with each other; a first gap is formed between adjacent sources, and one drain is placed within the first gap; a second gap is formed between adjacent drains, and one source is placed within the second gap; the sources and drains are arranged alternately and have a clearance fit.

[0176] In some embodiments, the light detection array thin film is used to receive a detection trigger signal, be in a light detection state, and receive the light signal reflected by a detection part (such as a fingerprint, an eyeball, an iris, etc.) to capture the information of the user's detection part; and is used to receive a light source trigger signal and be in a state of emitting a light source (such as an infrared light source). Preferably, the light source trigger signal and the detection trigger signal are alternately switched and conform to a preset frequency. Taking the array formed by the photosensitive diodes in the light detection array thin film as an example, in the actual application process, the TFT can be used for scanning drive and a bias voltage (including a positive bias voltage, or a zero bias voltage or a negative bias voltage) can be applied between the p-type / i-type / n-type photodiodes to realize the function of the TFT image sensing array thin film emitting infrared light.

[0177] Specifically, a forward bias voltage, or a zero bias voltage or a negative bias voltage, can be alternately applied between p-type / i-type / n-type infrared photosensitive diodes to trigger the first trigger signal or the second trigger signal. Taking an array formed by infrared photosensitive diodes with 10 columns of pixel dot matrices as an example, in the first period, a forward bias voltage is applied to the p-type / i-type / n-type infrared photosensitive diodes, so that all 10 columns of pixel dot matrices are in the state of emitting infrared light; in the second period, a zero bias voltage or a negative bias voltage is applied to the p-type / i-type / n-type infrared photosensitive diodes, so that all 10 columns of pixel dot matrices are in the infrared light detection state, used to capture the infrared light information reflected back by the user's eyes, and generate a corresponding infrared image output; in the third period, a forward bias voltage is applied to the p-type / i-type / n-type infrared photosensitive diodes again, so that all 10 columns of pixel dot matrices are in the state of emitting infrared light, and so on by repeating the alternation. Further, the light source trigger signal (i.e., the first trigger signal) and the detection trigger signal (i.e., the second trigger signal) are alternately switched, and the switching frequency conforms to a preset frequency. The time interval between adjacent periods can be set according to actual needs. Preferably, the time interval can be set to the time required for the TFT array drive to scan each frame (Frame) of the infrared photosensitive diode array to receive at least one complete image signal, that is, the preset frequency is to perform a switch every time the above time interval passes.

[0178] The method and device for screen unlocking by synchronously verifying fingerprint information according to the above technical solution, the method is applied to the device for screen unlocking by synchronously verifying fingerprint information, the device includes a display unit and a sensing unit, a fingerprint recognition area is arranged on the display unit, and the sensing unit is located below the fingerprint recognition area and is used to obtain the fingerprint information on the fingerprint recognition area; the method includes the following steps: receiving the sliding trajectory of the user on the fingerprint recognition area, and synchronously collecting the fingerprint information corresponding to the user's finger; when it is detected that the sliding trajectory of the user on the fingerprint recognition area matches the preset sliding trajectory, determining whether the synchronously collected fingerprint information matches the preset fingerprint information, if so, the screen unlocking is completed, otherwise the screen unlocking fails. In this way, when the user performs a screen unlocking operation by swiping, the collection and authentication of the user's fingerprint information are synchronously performed. On the one hand, the security of screen unlocking is effectively improved by using a dual authentication method. On the other hand, the user can collect fingerprint information without having to operate on a specific button, effectively improving the user experience.

[0179] It should be noted that although the above embodiments have been described in this article, the patent protection scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, any changes and modifications made to the embodiments described in this article, or equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present invention, directly or indirectly applying the above technical solutions to other related technical fields, are all included in the patent protection scope of the present invention.

Claims

1. A method for screen unlocking by synchronously verifying fingerprint information, characterized in that, The method is applied to a screen unlocking device for synchronously verifying fingerprint information. The device includes a light-transmitting cover plate, a light screening component, a display unit, and a sensing unit. The display unit includes display pixels, and a fingerprint recognition area is arranged on the display unit. The sensing unit is used to acquire the fingerprint information on the fingerprint recognition area. The method includes: Receiving the sliding trajectory of the user on the fingerprint recognition area and synchronously collecting the fingerprint information corresponding to the user's finger. When it is detected that the sliding trajectory of the user on the fingerprint recognition area matches the preset sliding trajectory, determining whether the synchronously collected fingerprint information matches the preset fingerprint information. If so, the screen unlocking is completed; otherwise, the screen unlocking fails. Among them, synchronously collecting the fingerprint information corresponding to the user's finger includes: The display pixels emit optical signals, and the optical signals are reflected on the upper surface of the light-transmitting cover plate to form reflected optical signals. The light screening component filters the reflected optical signals and screens out the optical signals within a preset angular range. The sensing unit receives the optical signals screened out by the light screening component. Among them, the light screening component includes optical glue. The optical glue is used to filter the reflected optical signals and screen out the optical signals within a preset angular range. The optical glue filters the reflected optical signals with an incident angle greater than the first critical angle on the optical glue to obtain the first reflected optical signals. The sensing unit receives the first reflected optical signals. The first critical angle is the critical angle at which the reflected optical signals can undergo total internal reflection on the surface of the optical glue; or, The light screening component includes an optical device. The optical device is used to filter the reflected optical signals with an incident angle less than the second critical angle on the surface of the optical device to obtain the second reflected optical signals. The sensing unit receives the second reflected optical signals. The second critical angle is the critical angle at which the optical signals emitted by the display pixels can undergo total internal reflection on the upper surface of the light-transmitting cover plate.

2. The method for screen unlocking by synchronously verifying fingerprint information according to claim 1, wherein The light screening component includes optical glue, and the optical glue is attached to the lower surface of the display unit. The refractive index of the optical glue is less than that of the light-transmitting cover plate.

3. The method for screen unlocking by synchronously verifying fingerprint information according to claim 1, characterized in that, The light screening component includes the optical device and the optical glue. The light screening component filters the reflected optical signals and screens out the optical signals within a preset angular range. The sensing unit receiving the optical signals screened out by the light screening component includes: The optical glue filters the reflected optical signals with an incident angle greater than the first critical angle on the optical glue to obtain the first reflected optical signals. The first reflected optical signals enter the optical device. The first critical angle is the critical angle at which the reflected optical signals can undergo total internal reflection on the surface of the optical glue. The optical device filters the first reflected optical signals with an incident angle less than the second critical angle on the surface of the optical device to obtain the second reflected optical signals. The sensing unit receives the second reflected optical signals. The second critical angle is the critical angle at which the optical signals emitted by the display pixels can undergo total internal reflection on the upper surface of the light-transmitting cover plate.

4. The method for screen unlocking by synchronously verifying fingerprint information according to claim 1, wherein, The light screening component includes the optical device, and the optical device is further adapted to cause the second reflected light signal to enter the sensing unit at an incident angle less than a preset angle.

5. The method for screen unlocking by synchronously verifying fingerprint information according to claim 1, wherein The sensing unit is a light detection array film, the light detection array film is an array formed by photosensitive transistors, the photosensitive transistors include photosensitive transistor sensing regions, and photosensitive thin film transistors are arranged in the photosensitive transistor sensing regions; the photosensitive thin film transistors include source electrodes, drain electrodes and photoabsorbing semiconductor layers; a photosensitive drain current channel is formed horizontally between the source electrode and the drain electrode, and the photoabsorbing semiconductor layer is arranged in the photosensitive drain current channel.

6. The method for screen unlocking by synchronously verifying fingerprint information as described in claim 1, wherein, The fingerprint recognition area includes a plurality of fingerprint recognition sub-areas, and a sensing unit is correspondingly arranged below each fingerprint recognition sub-area; the method includes: Receiving a start instruction from a user for a fingerprint recognition sub-area, and turning on the sensing unit below the fingerprint recognition sub-area; Alternatively, receiving a close instruction from a user for a fingerprint recognition sub-area, and turning off the sensing unit below the fingerprint recognition sub-area.

7. The method for screen unlocking by synchronously verifying fingerprint information according to claim 1, wherein, The device further includes a touch screen and a processor; The light signals emitted by the display pixels include: When the processor detects a touch signal of a user's finger on the touch screen, the processor sends a display driving signal to the display unit; The display pixels emit light signals when receiving the display driving signal sent by the processor.

8. The method for screen unlocking by synchronously verifying fingerprint information according to claim 1, wherein The device includes a processor, the light screening component includes the optical device, and the method includes: The processor generates physiological characteristic recognition image information based on the second reflected light signal received by the sensing unit and outputs the same.

9. The method for screen unlocking by synchronously verifying fingerprint information according to claim 8, wherein, The display screen includes a plurality of display pixels, and the method includes: The processor performs signal superposition on the second reflected light signals corresponding to the light signals emitted by several groups of single display pixels or several groups of display pixel arrays, reconstructs complete physiological characteristic recognition image information and outputs the same; each group of display pixel arrays includes a plurality of display pixels.

10. A device for synchronously verifying fingerprint information for screen unlocking, characterized in that, The device includes a light screening component, a display unit, a processor, a sensing unit and a computer program; the display unit includes display pixels, a fingerprint recognition area is arranged on the display unit, and the sensing unit is used for acquiring fingerprint information on the fingerprint recognition area; The sensing unit is used for receiving the sliding track of a user on the fingerprint recognition area and synchronously collecting fingerprint information corresponding to the user's finger; When the computer program is executed by the processor, the following steps are implemented: When it is detected that the sliding track of a user on the fingerprint recognition area matches a preset sliding track, it is determined whether the synchronously collected fingerprint information matches the preset fingerprint information. If so, the screen unlocking is completed; otherwise, the screen unlocking fails; Among them, synchronously collecting fingerprint information corresponding to a user's finger includes: The display pixels are used for emitting light signals, and the light signals are reflected on the upper surface of the light-transmitting cover plate to form reflected light signals; The light screening component is used for filtering the reflected light signals and screening out the light signals within a preset angle range; The sensing unit is used for receiving the light signals screened out by the light screening component; Among them, the light screening component includes optical glue, and the optical glue is used to filter the reflected light signals in the reflected light signals whose incident angle in the optical glue is greater than the first critical angle to obtain the first reflected light signal. The sensing unit is used to receive the first reflected light signal, and the first critical angle is the critical angle at which the reflected light signal can undergo total internal reflection on the surface of the optical glue; or, the light screening component includes an optical device, and the optical device is used to filter the reflected light signals in the reflected light signals whose incident angle on the surface of the optical device is less than the second critical angle to obtain the second reflected light signal. The sensing unit is used to receive the second reflected light signal, and the second critical angle is the critical angle at which the light signal emitted by the display pixel can undergo total internal reflection on the upper surface of the light-transmitting cover plate.

11. The device for screen unlocking by synchronously verifying fingerprint information according to claim 10, characterized in that, The light screening component includes optical glue, and the optical glue is attached to the lower surface of the display unit; the refractive index of the optical glue is less than that of the light-transmitting cover plate.

12. The device for screen unlocking by synchronously verifying fingerprint information according to claim 10, wherein The light screening component includes an optical device and optical glue; The light screening component is used to filter the reflected light signal and screen out the light signals within a preset angle range. The sensing unit is used to receive the light signals screened out by the light screening component, including: The optical glue is used to filter the reflected light signals in the reflected light signals whose incident angle in the optical glue is greater than the first critical angle to obtain the first reflected light signal, and the first reflected light signal enters the optical device; the first critical angle is the critical angle at which the reflected light signal can undergo total internal reflection on the surface of the optical glue; The optical device is used to filter the first reflected light signals in the first reflected light signals whose incident angle on the surface of the optical device is less than the second critical angle to obtain the second reflected light signal, and the sensing unit is used to receive the second reflected light signal; the second critical angle is the critical angle at which the light signal emitted by the display pixel can undergo total internal reflection on the upper surface of the light-transmitting cover plate.

13. The device for screen unlocking by synchronously verifying fingerprint information according to claim 10, wherein, The light screening component includes an optical device, and the optical device is also suitable for making the second reflected light signal enter the sensing unit at an incident angle less than a preset angle.

14. The device for screen unlocking by synchronously verifying fingerprint information according to claim 10, wherein, The sensing unit is a light detection array film; the light detection array film is an array formed by photosensitive transistors. The photosensitive transistor includes a photosensitive transistor sensing area, and a photosensitive thin-film transistor is arranged in the photosensitive transistor sensing area; the photosensitive thin-film transistor includes a source electrode, a drain electrode, and a light-absorbing semiconductor layer; a photosensitive drain current channel is formed horizontally between the source electrode and the drain electrode, and the light-absorbing semiconductor layer is arranged in the photosensitive drain current channel.

15. The screen unlocking device for synchronously verifying fingerprint information according to claim 10, wherein The fingerprint recognition area includes a plurality of fingerprint recognition sub-areas, and a sensing unit is correspondingly arranged below each fingerprint recognition sub-area; When the computer program is executed by the processor, the following steps are further implemented: Receiving a start instruction from the user for a fingerprint recognition sub-area, and turning on the sensing unit below the fingerprint recognition sub-area; Or, receiving a close instruction from the user for a fingerprint recognition sub-area, and turning off the sensing unit below the fingerprint recognition sub-area.

16. The device for screen unlocking by synchronously verifying fingerprint information according to claim 10, wherein The device further includes a touch screen; The processor is configured to send a display driving signal to the display unit when a touch signal of a user's finger is detected by the touch screen; The display pixels are configured to emit optical signals, including: The display pixels emit optical signals when receiving the display driving signal sent by the processor.

17. The screen unlocking device for synchronously verifying fingerprint information according to claim 10, wherein, The light screening component includes the optical device, and the processor is configured to generate and output physiological feature recognition image information based on the second reflected optical signal received by the sensing unit.

18. The device for screen unlocking by synchronously verifying fingerprint information according to claim 17, wherein, The display screen includes a plurality of display pixels; The processor is configured to perform signal superposition on the second reflected optical signals corresponding to the optical signals emitted by several groups of single display pixels or several groups of display pixel arrays, reconstruct complete physiological feature recognition image information, and output the same; each group of display pixel arrays includes a plurality of display pixels.

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