TWI720484B - Touch element operation method and device for synchronously verifying fingerprint information - Google Patents

Abstract

A touch element operating method and device for synchronously verifying fingerprint information is provided. The method is applied to a touch element operating device for synchronously verifying fingerprint information, the device includes a display unit and a sensing unit, the display unit is provided with a fingerprint identification area, the sensing unit is located below the fingerprint identification area, and is used for acquiring fingerprint information on the fingerprint identification area. The display unit is configured to display at least one touch element in the fingerprint identification area . The method includes the following steps: receiving an operation instruction of a user's finger on the touch component, and synchronously collecting fingerprint information corresponding to the user's finger. The instant invention can effectively reduce the operation steps of the user's fingerprint collection and improve the user experience.

Description

Touch element operation method and device for synchronously verifying fingerprint information

The invention relates to the field of electronic equipment, in particular to a touch element operation method and device for synchronously verifying fingerprint information.

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 operating screens of industrial computers, tablet computers, and touch screens of smart phones. Since these devices are usually accompanied by a large amount of user information during use, the protection of user information security is particularly important. Among many information security protection methods, fingerprint recognition and encryption is an important one.

The current display panel technology, whether it is a liquid crystal display (LCD), an active array organic light-emitting diode (AMOLED) display, or a micro-LED (micro-LED) display, are all thin-film transistors (TFT) structure scans and drives a single pixel to realize the display function of the pixel array on the screen. The main structure forming the switching function of TFT is the semiconductor field effect transistor (FET). The main materials of the well-known semiconductor layer are amorphous silicon, polysilicon, indium gallium zinc oxide (IGZO), or organic compounds mixed with carbon nanomaterials, etc. Wait. Since the structure of the photo diode (Photo Diode) can also be made of such semiconductor materials, and the production equipment is also compatible with the production equipment of the TFT array, the prepared photo diode can be directly integrated with the TFT and used TFT realizes the function of scanning and driving photosensitive diodes. Therefore, in recent years, TFT light detection diodes have begun to be produced by TFT array preparation methods, and are widely used in X-ray sensing flat panel devices, such as the People's Republic of China patent CN103829959B, Described in CN102903721B.

Compared with image sensor devices made of traditional crystalline materials, the band gap of the above-mentioned TFT photodetection array thin film materials all take visible light as the main absorption range, so they are more susceptible to the interference of ambient visible light to form noise. This results in a lower signal-to-noise ratio (SNR). Limited by this, the initial application of TFT light sensing array is mainly based on the application of X-ray sensing flat panel devices. The main reason is that X-rays are short-wavelength light and have high collimation. X-ray images are first incident on the sensor. The light wavelength conversion material arranged on the plate converts the X-ray image into longer-wavelength visible light and then directly transmits the inside of the sensing plate to the TFT light detection array film, avoiding noise interference caused by visible light in the surrounding environment, such as the above-mentioned Chinese People’s Republic of China patents CN103829959B, CN102903721B described.

If such a well-known TFT visible light detection array film is arranged in the display screen structure, it can be used as an implementation solution for integrating the light detection function into the display screen. However, due to factors such as the thickness of the display screen and the aperture of the display pixels, the real image sensed by the photodetection diode array is already an image with optical distortion such as diffraction, and because the optical signal penetrates the multi-layer structure of the display screen, And in the case of the coexistence of optical display signals and touch sensing signals, it is very difficult to extract useful optical signals from a scene with a low signal-to-noise ratio. The technical difficulty level can reach the level of single-photon imaging, and related algorithms must be used. The original image can be parsed by reconstructing based on light wave theory. In order to avoid this technical difficulty, it is well known that arranging the visible light sensor film in the original display screen structure will require additional optical enhancement devices, or only arranging the light sensor film in the side of the display screen, using non-vertical reflection The light that reaches the side is reconstructed by light image, for example, as described in the People's Republic of China Patent CN101359369B. However, although this type of technology can avoid the technical difficulties of low-light imaging, additional optical devices increase the thickness of the light-detecting display screen, and the configuration on the side of the display screen cannot satisfy the user's full-screen experience.

In short, limited by the structure of the existing display screen, when the user operates the touch elements (such as pictures, videos, etc.) on the terminal display screen, the terminal cannot simultaneously collect the user's fingerprints, let alone fingerprints. Identify operations. When fingerprint authentication is required, the user's fingerprints still need to be collected again, which is cumbersome and brings a bad experience to the user.

In summary, it is particularly necessary to provide a solution that can synchronously collect the user's fingerprint when the user operates the touch element on the display screen, so as to reduce the user's operation steps and improve the user experience.

Therefore, it is necessary to provide a technical solution for synchronously verifying the operation of the touch element of fingerprint information, which is used to solve the problem that the user's fingerprint cannot be collected synchronously when the terminal is operating the touch element on the screen. Problems such as poor user experience.

In order to achieve the above object, the inventor provides a touch element operation method for synchronously verifying fingerprint information. The method is applied to a touch element operating device for synchronously verifying fingerprint information. The device includes a display unit and a sensing unit. The display unit is provided with a fingerprint recognition area, the sensing unit is located below the fingerprint recognition area, and is used to obtain fingerprint information on the fingerprint recognition area; the display unit is used to display at least one fingerprint in the fingerprint recognition area The touch element; the method includes the following steps: receiving an operation instruction of the user's finger on the touch element, and synchronously collecting fingerprint information corresponding to the user's finger.

Further, the method further includes the following steps: determining whether to execute the operation instruction to the touch element according to the fingerprint information collected synchronously; specifically including: judging whether the fingerprint information corresponding to the user's finger synchronously collected matches the preset fingerprint information , If yes, execute the operation instruction, otherwise do not execute the operation instruction.

Further, the sensing unit is a photodetection array film, the photodetection array film includes PxQ pixel detection areas, each pixel detection area is provided with a pixel detection structure corresponding to each pixel detection structure A set of thin film circuits for pixels and a photodetection unit composed of one or more thin film transistors are included; the photodetection unit includes a photosensitive diode or a photosensitive transistor.

Further, the light detection film is an array formed by photosensitive diodes, the photosensitive diodes include a photosensitive diode sensing area, the photosensitive diode sensing area is provided with a photosensitive diode layer, so Narrate 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, and the i-type semiconductor layer is microcrystalline. Silicon structure or amorphous germanium silicide structure.

Further, the light detecting film is an array formed by photosensitive transistors, the photosensitive transistors including a photosensitive transistor sensing area, the photosensitive transistor sensing area is provided with a photosensitive thin film transistor, the photosensitive thin film transistor It includes a gate electrode, a source electrode, a drain electrode, an insulating layer, and a light-absorbing semiconductor layer; the photosensitive thin film transistor has an inverted coplanar structure, and the inverted coplanar structure includes: the gate, an insulating layer, and a source. It is arranged vertically from bottom to top, and the drain and the source are arranged laterally coplanar; the insulating layer wraps the gate so that neither the gate and the source nor the gate and the drain are in contact; the source Gap fit with the drain, a photosensitive leakage current channel is formed between the source and the drain laterally, and the light absorbing semiconductor layer is arranged in the photosensitive leakage current channel.

Further, the fingerprint recognition area includes a plurality of fingerprint recognition sub-areas, and a sensing unit is correspondingly arranged under each fingerprint recognition sub-areas; the method includes: receiving a user's activation instruction for the fingerprint recognition sub-areas, and turning on the fingerprint recognition sub-areas. The sensing unit below the area; or, receiving a user's instruction to close the fingerprint recognition sub-area, and turn off the sensing unit below the fingerprint recognition sub-area.

Further, the display unit is a self-luminous diode display screen, and the device further includes a cover glass, a touch screen, an optical glue, and an optical device; the cover glass, a touch screen, a self-luminous two The polar body display screen, the optical glue, the optical device, and the sensing unit are arranged from top to bottom; the touch screen is attached to the lower surface of the cover glass, and the optical glue is attached to the self-luminous diode display screen The lower surface of the optical glue; the refractive index of the optical glue is less than the refractive index of the cover glass, the self-luminous diode display screen includes a plurality of display pixels; the device also includes a processor; the synchronous collection of the user's finger corresponding The fingerprint information includes: when the processor detects the touch signal of the user's finger on the touch screen, it sends a display drive signal to the self-luminous diode display screen; When the display pixel receives the display drive signal from the processor, it emits a light signal, and the light signal is reflected on the upper surface of the cover glass to form a reflected light signal; the optical glue changes the optical path of the reflected light signal, and the reflected light signal is The reflected light signal whose incident angle of the optical glue is greater than the first critical angle is filtered to obtain the first reflected light signal, and make the first reflected light signal enter the optical device; the first critical angle is that the reflected light signal can be on the surface of the optical glue The critical angle at which total reflection occurs; the optical device changes the optical path of the first reflected optical signal, and filters the first reflected optical signal whose incident angle on the surface of the optical device is smaller than the first critical angle in the first reflected optical signal to obtain the second reflection Optical signal, and make the second reflective signal enter the sensing unit at an incident angle smaller than the preset angle; the second critical angle is the critical angle at which the reflected optical signal can be totally reflected on the upper surface of the cover glass; the processor is based on The second reflected light signal received by the sensing unit generates fingerprint information and outputs it.

Further, the self-luminous diode display screen includes MxN display pixels; 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. The upper surface of the plate glass forms a light spot or a combination of light spots to scan the user's finger part to form a reflected light signal.

The inventor also provides a touch element operating device for synchronously verifying fingerprint information. The device includes a display unit, a sensing unit, a processor, and a computer program. The display unit is provided with a fingerprint recognition area, and the sensing unit Located below the fingerprint recognition area, it is used to obtain fingerprint information on the fingerprint recognition area; the display unit is used to display at least one touch element in the fingerprint recognition area; the computer program is executed when the processor is executed The following steps: receiving the operation instruction of the user's finger on the touch element, and controlling the sensing unit to synchronously collect the fingerprint information corresponding to the user's finger.

Further, the display unit is a self-luminous diode display screen, and the device further includes a cover glass, a touch screen, an optical glue, and an optical device; the cover glass, a touch screen, a self-luminous two The polar body display screen, the optical glue, the optical device, and the sensing unit are arranged from top to bottom; the touch screen is attached to the lower surface of the cover glass, and the optical The glue is attached to the lower surface of the self-luminous diode display screen; the refractive index of the optical glue is smaller than that of the cover glass, the self-luminous diode display screen includes a plurality of display pixels; the device further includes The processor; the control and sensing unit synchronously collecting fingerprint information corresponding to the user's finger includes: the processor sends a display driving signal to the self-luminous diode display when the touch signal of the user's finger is detected on the touch screen Screen; when the display pixel receives the display drive signal from the processor, it emits a light signal, and the light signal is reflected on the upper surface of the cover glass to form a reflected light signal; the optical glue changes the optical path of the reflected light signal to reflect the light signal In the optical glue, the reflected light signal whose incident angle is greater than the first critical angle is filtered to obtain the first reflected light signal, and make the first reflected light signal enter the optical device; the first critical angle is that the reflected light signal can enter the optical device. The critical angle at which total reflection occurs on the glue surface; the optical device changes the optical path of the first reflected optical signal, and filters the first reflected optical signal whose incident angle on the surface of the optical device is smaller than the first critical angle in the first reflected optical signal to obtain the first reflected optical signal. 2. Reflect the light signal, and make the second light signal enter the sensing unit at an incident angle smaller than the preset angle; the second critical angle is the critical angle at which the reflected light signal can be totally reflected on the upper surface of the cover glass; processing The sensor generates and outputs fingerprint information according to the second reflected light signal received by the sensing unit.

Different from the prior art, the touch element operation method and device for synchronously verifying fingerprint information described in the above technical solution are applied to a touch element operating device for synchronously verifying fingerprint information. The device includes a display unit and a sensing unit , The display unit is provided with a fingerprint recognition area, and the sensing unit is located below the fingerprint recognition area, and is used to obtain fingerprint information on the fingerprint recognition area; the display unit is used in the fingerprint recognition area At least one touch element is displayed. The method includes the following steps: receiving operation instructions of the user's finger on the touch element, and synchronously collecting fingerprint information corresponding to the user's finger. The above solution can effectively reduce the operation steps of user fingerprint collection and improve user experience.

1: Cover glass/touch screen

2: Self-luminous diode display screen

21: Display pixels

3: Light detection array film

31: photosensitive pixel

4: Optical glue

5: Optics

101: grid

102: Source

103: drain

104: Insulation layer

105: light absorbing semiconductor layer

FIG. 1 shows a schematic diagram of an application structure of a light detecting array film according to an embodiment of the present invention

FIG. 2 is a schematic diagram of display pixels of a self-luminous diode display screen according to an embodiment of the present invention

FIG. 3 is a schematic diagram of the light path change of the light emission and reflection of a single display pixel according to an embodiment of the present invention

FIG. 4 is a schematic diagram of the light path change of the light emission and reflection of a single display pixel after the optical glue is set according to an embodiment of the present invention

FIG. 5 is a schematic diagram of the light path change of the light emission and reflection of a single display pixel after the optical glue and the optical device are set according to an embodiment of the present invention

FIG. 6 is a schematic diagram of the effective light-emitting area corresponding to a single display pixel according to an embodiment of the present invention

FIG. 7 is a schematic structural diagram of a touch element operating device for synchronously verifying fingerprint information according to an embodiment of the present invention

FIG. 8 shows a flowchart of a method for synchronously collecting fingerprint information according to an embodiment of the present invention

FIG. 9 is a schematic diagram of the structure of the light detection unit involved in an embodiment of the present invention

FIG. 10 is a schematic diagram showing the structure of a light detecting unit according to another embodiment of the present invention

FIG. 11 is a schematic diagram of the structure of the source electrode and the drain electrode involved in another embodiment of the present invention

FIG. 12 shows a flow chart of the preparation of the light detection unit according to another embodiment of the present invention

FIG. 13 is a flowchart of a touch element operation method for synchronously verifying fingerprint information according to an embodiment of the present invention

In order to describe in detail the technical content, structural features, achieved objectives and effects of the technical solution, the following detailed description will be given in conjunction with specific embodiments and accompanying drawings.

As shown in FIG. 13, it is a flowchart of a touch element operation method for synchronously verifying fingerprint information according to an embodiment of the present invention. The method is applied to a device for synchronously verifying the operation of a touch element of 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 such as a mobile phone, a tablet computer, and a personal digital assistant, or an electronic device such as a personal computer and a computer for industrial equipment.

The display unit is provided with a fingerprint identification area, and the sensing unit is arranged below the fingerprint identification area for acquiring fingerprint information on the fingerprint identification area. The display unit is a display screen using active array thin film transistors as scanning drive and data transmission, including AMOLED display screens, LCD liquid crystal display screens, micro light emitting diode display screens, quantum dot display screens, or electronic ink Display screen.

The method includes the following steps:

First, step S1301 is entered to receive the operation instruction of the user's finger on the touch element, and the fingerprint information corresponding to the user's finger is synchronously collected. The touch elements include text, pictures, videos, audios, folders, documents, application icons, etc. The operation instructions include sliding operation instructions, touch operation instructions, pressing operation instructions, click operation instructions, and the like.

In this embodiment, the coverage of the sensing unit is adapted to the size of the touch display screen, so that when the user operates the touch element at any position on the screen, the sensing unit can capture User's fingerprint information. The user's operation of the touch elements on the screen can be done with a single finger or with multiple fingers. When the operation of the touch element on the screen is completed by multiple fingers, if multiple fingers are located in the fingerprint recognition area during the input operation instruction, the sensing unit will perform the fingerprint information corresponding to these fingers. collection.

In other embodiments, there may be multiple sensing units, as long as the multiple sensing units are spliced into a size suitable for the display unit and placed under the display unit. Compared with a large-area sensing unit, a small area is easier to produce and process, which helps to save production costs.

In other embodiments, preferably, the fingerprint recognition area may also be an area smaller than the size of the display screen, for example, occupies 1/2 or 1/4 of the overall size of the display screen. Preferably, the shape of the fingerprint recognition area is a rectangle. The size of the rectangle is located in 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, if the user's finger is outside the fingerprint recognition area, the fingerprint information will not be recognized because the area outside the fingerprint recognition area is not provided with a sensing unit; when the user drags or clicks When the touch element is moved to 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.

In some embodiments, the display unit includes a touch unit; the step of "receiving an operation instruction of the user's finger on the touch element" includes: the sensing unit or the touch unit receives the user's finger on the touch element Sliding trajectory, generating sliding trajectory information, and storing the sliding trajectory information. The touch unit may be a touch screen, and the touch screen may be used to perceive a user's touch operation on it, and the touch operation includes a sliding track operation. Both the sliding track information and the fingerprint information may be obtained by the sensing unit, or the sliding track information may be recognized by the touch unit, and the fingerprint information may be captured by the sensing unit. In short, for a terminal with a touch screen, the sliding track information is captured by the sensing unit or the touch unit, which effectively improves the application range of the device.

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 arranged below the sensing unit, and the sensing unit is arranged 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, it is necessary to add a backlight unit below the sensing unit during installation. The backlight unit can be an LCD backlight module or other electronic components with self-luminous function. 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. Through the settings of the above two schemes, the production needs of different manufacturers can be effectively met, and the scope of application of the terminal can be improved.

In some embodiments, the fingerprint recognition area includes a plurality of fingerprint recognition sub-areas, and a sensing unit is correspondingly disposed under each fingerprint recognition sub-areas. The device also includes a sensing unit control circuit, so The method further includes: receiving a user's instruction to activate the fingerprint recognition sub-area, the sensing unit control circuit turns on a sensing unit below the fingerprint recognition sub-area, and receiving a user's instruction to close the fingerprint recognition sub-area, and the sensing unit controls The circuit turns off the sensing unit below the fingerprint recognition sub-region.

Taking the number of fingerprint recognition areas as two as an example, the two fingerprint recognition sub-areas can be evenly distributed on the screen one up and down, one left and one right, or they can be distributed in other arrangements on the screen. The application process of the terminal with two fingerprint recognition sub-areas is described in detail below: in the use process, the start signal triggered by the user is received, and the light detection devices (ie sensing units) under the two fingerprint recognition sub-areas are all Set to open state. In a preferred embodiment, the range formed by the two fingerprint recognition sub-areas covers the entire display screen, which ensures that when the light detection devices under the two fingerprint recognition sub-areas are all set to the on state, the light signal entering the display screen can be The lower TFT image sensing array film (ie, the sensing unit) is absorbed to capture the user's fingerprint information.

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

In some embodiments, the method includes: determining whether to execute the operation instruction to the touch element according to the fingerprint information collected synchronously. Specifically, the method further includes the following steps:

First enter the step to set the operation configuration information in advance. The operation configuration information includes the corresponding relationship between the operation command and the preset fingerprint information. The preset fingerprint information is the fingerprint information entered by the user in advance. Each fingerprint information can correspond to an operation instruction, and each operation instruction can be triggered by one or more fingerprint information. The corresponding relationship between the operation instruction and the preset fingerprint information can be stored in the storage unit of the device, such as the memory of the mobile phone, the hard disk of the computer, or the storage unit of the server, when it is necessary to obtain the preset operation configuration information , Just let the device establish a communication connection with the server Then, get the corresponding relationship between the operation instruction and the preset fingerprint information from the server. The communication connection includes a wired communication connection or a wireless communication connection.

After step S1301, step S1302 can be entered to determine whether the fingerprint information corresponding to the user's finger of the synchronous collection matches the preset fingerprint information. If so, step S1303 is executed to execute the operation command, otherwise, step S1304 is not executed to execute the operation command. The operation instruction is an operation instruction corresponding to the preset fingerprint information in the operation configuration information. The comparison of fingerprint information can be realized by fingerprint recognition algorithm. The fingerprint recognition algorithm can be stored in the storage unit of the device. When the sensing unit obtains the fingerprint information on the fingerprint recognition area, the processor of the device will call the storage The fingerprint recognition algorithm in the unit compares the acquired fingerprint information with the preset fingerprint information to determine whether the two match. Fingerprint recognition algorithms include preprocessing of fingerprint images, data feature extraction, feature matching, fingerprint recognition and other steps. It can be implemented by a variety of algorithms. These algorithms are mature existing technologies and have been applied to various encryptions. In the field of decryption, I won’t go into details here.

In some embodiments, the "pre-set operation configuration information" includes:

First, enter the step to receive user setting instructions, and display the fingerprint recognition area. The setting instruction can be triggered by the user clicking a button in the setting column on the terminal screen. After receiving the setting instruction, the device will display the fingerprint recognition area for the user to input fingerprint information. In this embodiment, displaying the fingerprint recognition area may include: increasing the brightness of the fingerprint recognition area or displaying a prompt input box on the fingerprint recognition area.

In some embodiments, before receiving the user setting command, it further includes receiving user account information, where the account information includes user ID and password. The user needs to enter the correct user ID and password and log in to the user account before the setting command can be triggered. This can improve the security of fingerprint information settings on the one hand, and can also distinguish between different devices on one device. User, save the effect of different fingerprint information.

Then enter the step to obtain and save the fingerprint information of the user on the fingerprint identification area. When the end of the user's finger touches the fingerprint recognition area, the collected fingerprint information is the preset fingerprint information, and the collected information is stored in the storage unit. In this embodiment, the device includes a storage unit, The step of "obtaining and saving the user's fingerprint information on the fingerprint recognition area" includes: judging whether the fingerprint information during the user setting process has been stored in the storage unit, and prompting the user that the fingerprint information has been Entry; when the judgment is no, save the fingerprint information to the storage unit. This can effectively avoid repeated entry of fingerprint information.

Then enter the step to display an operation instruction identification field meta table, receive the user's selection instruction of the operation instruction identification, establish and save the corresponding relationship between the operation instruction corresponding to the selected operation instruction identification and the acquired fingerprint information. The operation instruction identification field element table contains one or more operation instruction corresponding identifiers, and each operation instruction identifier corresponds to an operation instruction. The selection instruction can be triggered by the user clicking to check, double clicking, etc. In this way, users can set more important operations (such as payment operations, startup of certain applications, etc.) to be executed only by using fingerprint information according to their own needs; and for less important operations, they do not select settings .

In some embodiments, the method further includes the step of sending out prompt information when the preset fingerprint information matching the acquired fingerprint information is not recognized. The prompt information includes one or more of sound prompt information, image prompt information, light prompt information, and video prompt information. "The default fingerprint information that matches the acquired fingerprint information is not recognized" usually includes the following two situations: one is fingerprint recognition failure, that is, the fingerprint information is pre-stored in the storage unit, but when the user's fingerprint information is acquired , Because the end of the user's finger is not in full contact with the screen, the collected fingerprint information is not complete, resulting in fingerprint identification failure; another situation is that the fingerprint information is not stored in the storage unit.

For the first case, when the device does not recognize the preset fingerprint information that matches the acquired fingerprint information, it will send out a voice prompt information or an image prompt information. The voice prompt information includes voice prompt information prompting the user to re-enter the fingerprint, and the image prompt information includes pop-up prompt information prompting the user to re-enter the fingerprint. When the number of times the fingerprint information input by the user is obtained exceeds the preset number, and the preset fingerprint information matching the obtained fingerprint information is not recognized, it is determined that the fingerprint information is not stored in the storage unit, that is, the above Said another situation.

For the second case, the device can also send out image prompt information, for example, a pop-up window prompts the user that the current fingerprint information is entered; it can also send out video prompt information, the video prompt information contains A tutorial on how to enter new fingerprint information. The user can complete the entry of new fingerprint information according to the video prompt information. Of course, the prompt information can also be realized by means of vibration, light-sensing prompts, etc. In short, the prompt information is just to let the user know as soon as possible that there is no fingerprint information matching the fingerprint information obtained this time. The selection of the prompt information form can be adjusted accordingly according to the settings of different manufacturers.

In some embodiments, the device includes a storage unit, and the method further includes: storing the fingerprint information corresponding to the user's finger synchronously collected in the storage unit. After the sensing unit collects the fingerprint information of the user's finger, the fingerprint information may not be compared immediately, and it may be retrieved and called after a period of time. Preferably, the storage unit is a non-volatile memory, such as a mobile phone memory, a hard disk, and a flash drive.

For example, on shopping websites, the products for sale are usually presented in the form of a list of pictures (ie touch elements). The existing general practice is as follows: the user can add the selected products to the shopping by double-clicking or dragging. The shopping cart is unlocked by fingerprint to complete the payment operation of the goods in the shopping cart. Since the fingerprint authentication of the payment process and the operation steps of the user selecting the goods are independent of each other, additional operation steps of the user’s payment process are added. With the solution of this application, when a user selects a commodity for sale, the terminal can synchronously collect the user's fingerprint information. For example, the operation command is a pressing command. When it is detected that the pressing force of the user's finger on the picture of the product for sale exceeds the preset value, it is deemed to have received the pressing operation command. The fingerprint information is preset for comparison, and if it matches, the payment operation is completed. This undoubtedly simplifies the operation steps of the user's purchase of goods and improves the user experience.

Another example is the videos or documents stored on mobile phones or tablets (ie touch components). Users generally hope that without their authorization, other people will not be allowed to view these videos or documents, and there is no prevention in the prior art. Solutions for other users to view videos or documents, which also affects the user experience. With the solution of this application, when the user opens the video or document on the desktop with the finger part (such as double-clicking, touching, pressing the video or document, etc.), the sensing unit will synchronously collect the user’s fingerprint information. The resource opens the corresponding video or document only when the collected fingerprint information matches the preset fingerprint information, thereby effectively improving the security of opening the desktop file and improving the user experience.

As shown in Figure 1, the touch display screen includes a combination of cover glass, touch screen, and self-luminous diode display pixels from top to bottom. Under the touch display screen, a light detection array film (ie, sensing Unit), so as to realize the detection and recognition of the user's physiological characteristics (such as fingerprint or palmprint information). Taking fingerprint recognition as an example, the structure shown in Figure 1 has at least the following problems when realizing fingerprint information collection: (1) After the display pixels directly below the finger are irradiated on the finger, light penetration occurs on the upper surface of the cover glass. Different optical phenomena such as light transmission, light reflection and light scattering, whether it is the convexity or concave of the fingerprint, the effective reflection light signal that can really form bright and dark is very weak. It is even more important to distinguish the convexity or concave of the fingerprint. Difficulties are even more difficult; (2) Limited by the material and related thickness of the cover glass, touch screen, display screen and other structures, even if the reflected light signal is strong enough, when the cover glass, touch screen, display After reaching the light detection array film, the light intensity has been severely reduced (usually reduced by more than 95%), and the reflected light signal will also be optically distorted when passing through the TFT opening of the display screen, which affects the collection of fingerprint information; (3) Each display pixel of the self-luminous diode display screen has low light-emitting collimation, that is, the light-emitting angle is very wide. These large-angle light emission easily interfere with the fingerprints to be irradiated by adjacent or spaced pixel light sources, resulting in collection The fingerprint information obtained is inaccurate.

In order to solve the problem of the above-mentioned photodetection structure detecting physiological feature information, the intensity of the reflected light signal entering the photodetection array film is severely reduced, resulting in the inconspicuous distinction of the captured physiological feature information pattern and the inaccurate information collection. The invention provides a touch element operating device for synchronously verifying fingerprint information. The device can be used to detect and identify physiological characteristic information, such as fingerprints, palm prints, and the like.

As shown in Figure 7, the device includes 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 from top to bottom; The control type screen is attached to the lower surface of the cover glass, 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 smaller than that of the cover glass, so The self-luminous diode display screen includes a plurality of display pixels. For ease of description, all drawings of the present invention simplify the cover glass and the touch screen As a whole, it is recorded as cover glass/touch screen 1. 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 as the change of the light path on the surface of the cover glass.

When the light detection array film is arranged under the display screen structure, a single display pixel or a display pixel array (can be a row or a column of display pixels, or a plurality of display pixels arranged periodically or non-periodically) ) As the light source illuminates the fingerprints above the cover glass, the light will be reflected. Since most of the light irradiated to the fingerprint relief is absorbed by the relief skin, and the air gap between the relief and the cover glass can partly reflect the light irradiated to the relief, the photosensitive pixels of the photodetection array film can Receiving the different bright and dark features of the fingerprint concave and convex, the light detection array film can reconstruct the convex and concave image of the fingerprint according to the bright and dark features shown by the reflected light signal.

Please refer to FIG. 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 the detailed description of the optical path change of the light signal emitted by each display pixel, the present invention marks the display pixel in the Nth row and Mth column on the display screen as Pmn. The light path changes can be obtained in the same way. In order to better describe the changes in the light path of the display pixels, the thickness of the self-luminous diode display screen of 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. When the light path changes, the change of the reflected light signal on the surface of the display screen is negligible compared to the cover glass, so as to simplify the description.

Please refer to FIG. 3, which is a schematic diagram of the light path change of the light emission and reflection of a single display pixel according to an embodiment of the present invention. The upper circle in Figure 3 represents a _{top view of a beam with a cross-sectional radius smaller than R C} from a single display pixel Pmn. The incident angle of the beam with a radius of R _C to the upper surface of the cover glass is θc, as shown by the dotted line in Figure 3 .

Since the refractive index n2 of the cover glass is about 1.5, and the refractive index n1 of the air is about 1.0, when the light source of the (m, n) display pixel is irradiated upward at a large angle, the incident angle θ to the surface of the cover glass is greater than θc (θc=sin-1(n1/n2)) light will be totally reflected. Assuming that the projection length of θc corresponding to the r-axis of the circular coordinate is Rc, at the position Pmn of the (m, n)th light-emitting display pixel as the origin and Rc as the radius The light outside the dashed circle is a light ray that can be totally reflected 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 relief of the fingerprint contacting the upper surface of the cover glass, the refractive index of the relief skin has destroyed the original conditions of total reflection, resulting in relatively convex The reflected signal at the pattern position cannot be totally reflected in the cover glass, so that part of the reflected light signal enters the light detection array film through the lower surface of the cover glass to form a bright pattern. In contrast, because there is an air gap between the pits of the fingerprint and the cover glass, the reflected light signal at the position of the pits maintains total reflection, and cannot reach the light detection array film to form dark lines.

In short, compared to the light rays within the dashed circle in FIG. 3, that is, the light rays whose incident angle is greater than θc on the upper surface of the cover glass, it can be used to detect fingerprint pits with air gaps. Therefore, an effective fingerprint recognition technology under the optical display screen needs to use Rc as the characteristic size, and use an effective combination of light to illuminate or scan the finger part on the cover glass 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-1(θc).

When the light beam emitted by the light source of the (m, n)th display pixel on the display screen is irradiated upward at a large angle, although the incident angle θ of the upper surface of the cover glass is larger than the ray of θc (θc=sin-1( n1/n2)), there will be more accurate total reflection for the fingerprint pits separated by the air gap. However, if the incident angle is too large, the total reflection back to the light detection array film will also be more accurate. The longer it comes, this will cause the useful light image information to be attenuated more severely. When this part of the reflected light signal reaches the light detection array film, it has become a noise interference with no reference value. Therefore, it is also necessary to define the light detection range of the maximum available information when the (m, n)th display pixel is used as the light source to illuminate the fingerprint located above the cover glass.

Please refer to Figures 4 and 5, since the refractive index of the optical glue (n3) is smaller than the refractive index of the cover glass (n2), the first total reflection (hereinafter referred to as "total reflection") occurs on the upper surface of the cover glass. 1”) Among the light rays entering the surface of the optical glue, the rays with an incident angle φ greater than φc will have a second total reflection on the surface of the optical glue (hereinafter referred to as “total reflection 2”), φc=sin-1(n3/n2). Assuming that the projection length of φc corresponding to the circle coordinate r axis is Rc'=h‧tan-1(φc), in the dotted circle with the (m,n)th display pixel position Pmn as the origin and 2Rc' as the radius The outside light is the light that can be totally reflected 2 on the surface of the optical glue line. For the light rays that can be totally reflected 2 on the surface of the optical glue, compared with the light rays within the dashed circle with a radius of 2Rc', the reflected light signal path is too long, so there is no fingerprint with high precision. The light rays of information will therefore be filtered out by the optical glue with refractive index n3<n2 in a way of total reflection 2.

Combining Fig. 4 and Fig. 5, it can be seen that for a single display pixel, the light beams that can produce total reflection 1 and total reflection 2 in the light beam are light signals corresponding to fingerprint information with higher precision. Based on this, it can be defined that when the under-screen fingerprint recognition technology is implemented, the light detection array film can collect relative data after the (m, n)th display pixel of the self-luminous diode display screen is used as the light source to illuminate the fingerprint. The sensitive and effective fingerprint area is the dotted-line concentric circular ring-shaped beam area with the (m, n)th display pixel position Pmn as the origin and the range from Rc to 2Rc' as the radius. If projected to the direction of the circle coordinate r , Is the area range of Rc<r<2Rc', which is the most suitable fingerprint optical information that the light detection array film can obtain from the light source emitted by a single display pixel of the self-luminous diode display screen, as shown in Figure 6. Shown.

For the light rays outside the area larger than 2Rc', as mentioned above, the optical glue with the corresponding refractive index can be used to filter, that is, the light rays outside the area larger than 2Rc' will be totally reflected on the surface of the optical glue without entering the light. Detection of the film in the array, which in turn affects the collection of fingerprint information images. For light rays smaller than the Rc area, the present invention filters the light rays by arranging optical devices above the light detection array film. In this embodiment, the optical device 4 includes a light-shielding optical device and a phase-change optical device. The light-shielding optical device includes a periodic pinhole array or a non-periodic pinhole array. The device includes a photonic crystal structure or a microlens array structure whose refractive index changes periodically, or a diffuse scattering structure whose refractive index changes non-periodically.

Preferably, the shape of the pinhole can be a round hole or a square hole, and the optical device can be obtained by a compressed sampling method of coded aperture. Taking fingerprint recognition as an example, fingerprint information recognition only needs two grays: bright and dark. The first-order application requirements, through the filtering design of the spatial frequency (in this embodiment, specifically, it is necessary to filter the light rays that the display pixels irradiate to the cover glass surface θ<θc and θ>φc), and the coding aperture of the optical device is designed As a device with light guiding function, it can achieve high-resolution bright and dark light signal capture in the region of Rc<r<2Rc', and make the reflected light signal through the optical device to be as vertical as possible (into The incident angle is smaller than the preset angle) incident light detection array film. The reference of the coded aperture compression sampling method is as follows: Stephen R. Gottesman "Coded apertures: past, present, and future application and design," (Proceeding of SPIE, Vol. 6714, 2007), this article The article uses a simple one-dimensional model to illustrate that the coded aperture can be widely used in the design of thin optical devices that require high resolution, wide viewing angle, and. In short, through the coded aperture compression sampling method, the corresponding optical device can be designed according to the predetermined parameter requirements (that is, the light rays in the region of r<Rc are required to pass through the optical device). The specific steps are as follows: The existing technology will not be repeated here.

In other embodiments, the optical device can also be designed by using digital holography, through digital holography (or called calculator generated holography), according to the predetermined parameter requirements (that is, the optical device is required to filter out r<Rc Regional range of light rays) design the corresponding optical device, the specific steps can refer to the following documents: MASeldowitz, JPAllebach, and DWSweeney, "Synthesis of digital holograms by direct binary search," Appl. 1987). This article proposes that a calculator can be used to design a corresponding digital holography optical device with a specific algorithm to achieve a high-resolution output image.

In this embodiment, the device includes a cover glass, a touch screen, a self-luminous diode display screen, an optical glue, an optical device, and a light detection array film from top to bottom; the touch screen sticker Bonded to the lower surface of the cover glass, the optical glue is bonded to the lower surface of the self-luminous diode display screen; the refractive index of the optical glue is less than the refractive index of the cover glass, and the self-luminous diode displays The screen includes a plurality of display pixels; the device also includes a processor; the method includes the following steps:

First, in step S801, when the touch screen detects the touch signal of the user's finger, the processor sends a display driving signal to the self-luminous 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. In actual use, the user can choose to click or press the touch element on the screen, and his finger must touch the cover glass on the screen to trigger the touch signal.

Then it proceeds to step S802, when the display pixel receives the display driving signal of the processor, it emits a light signal, and the light signal is reflected on the upper surface of the cover glass to form a reflected light signal. Due to the display And the cover glass has a certain degree of light transmittance, so the light signal emitted by the display pixel will not only be reflected on the upper surface of the cover glass, but also transmitted, that is, directly penetrate the upper surface of the cover glass and enter the air. Only the light signal reflected on the upper surface of the cover glass will finally enter the photodetection array film to form a corresponding image signal. Therefore, the present invention performs further screening processing on the reflected light signal.

Then enter step 803, the optical glue changes the optical path of the reflected light signal, and filters the reflected light signal whose incident angle of the optical glue is greater than the first critical angle in the reflected light signal to obtain the first reflected light signal, and make the first reflected light signal Enter the optics. The first critical angle is the critical angle at which the reflected light signal can be totally reflected on the surface of the optical glue. In short, it is to filter the light signal whose light path is too long, that is, the light rays in the region of r>2Rc' through the optical glue with a refractive index smaller than that of the cover glass.

Then go to step S804, the optical device changes the optical path of the first reflected optical signal, and filters the first reflected optical signal whose incident angle on the surface of the optical device is less than the first critical angle in the first reflected optical signal to obtain the second reflected optical signal. And make the second reflection signal enter the sensing unit (ie, the light detection array film) at an incident angle smaller than the preset angle. The second critical angle is the critical angle at which the reflected light signal can be totally reflected on the upper surface of the cover glass. In short, it is to filter the light rays in the r<Rc area through the optical device, and make the light passing through the optical device (the corresponding radius r of the light on the coordinate axis satisfies Rc<r<2Rc') to enter the light detection as vertically as possible Measure the array film to increase the luminous flux so that the fingerprint characteristic information can be better captured.

Then it proceeds to step S805. The processor generates and outputs fingerprint information according to the second reflected light signal received by the light detection array film. That is, the light beams emitted by each display pixel are extracted to meet the Rc<r<2Rc' area, and then the light signals of each display pixel in this area are superimposed to reconstruct the complete physiological feature recognition. Image information (such as fingerprint image information) and output.

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 to emit light signals on the cover. The upper surface of the glass forms a light spot or a combination of light spots to scan the characteristic parts of the fingerprint to 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 . By preset timing electrical signals, the processor can drive the display pixels on the display screen row by row and column by column, or it can drive discrete display pixels that change periodically (such as driving the first row P _11, P _{13, and} P _{15 first,} and then Drive the second row P _21, P _23, P ₂₅ , and then drive the third row P _31, P _33, P ₃₅ , and so on), of course, it is also possible to drive a plurality of display pixels arranged aperiodicly in sequence. In short, the sequence of driving each display pixel on the display screen to emit light can be selected according to actual needs.

In some embodiments, the photodetection array film includes PxQ pixel detection areas, and each pixel detection area is correspondingly provided with a pixel detection structure, and each pixel detection structure includes more than one thin film transistors. One group is used for the pixel film circuit and a photodetection unit; the photodetection unit includes a photosensitive diode or a photosensitive transistor. For each light detection unit, there are several implementation methods:

Example one:

The TFT image sensing array film (ie, the photodetection array film) is an array formed by photosensitive diodes, and the array formed by the photosensitive diodes includes a photosensitive diode sensing area. Existing liquid crystal display (LCD) panels or organic light emitting diode (OLED) display panels all use a TFT structure to drive and scan a single pixel to realize the display function of the pixel array on the panel. The main structure that forms the switching function of TFT is semiconductor field effect transistor (FET), among which the well-known semiconductor layer materials mainly include amorphous silicon, polycrystalline silicon, indium gallium zinc oxide (IGZO), or organic compounds mixed with carbon nanomaterials, etc. Wait. Since the structure of the photo-sensing diode can also be made of such semiconductor materials, and the production equipment is also compatible with the production equipment of the TFT array, in recent years, the TFT photo-detecting diode (ie, photosensitive diode) has begun to use TFT array preparation method for production. For the specific structure of the existing photosensitive diode, please refer to the description of the structure of the light detection array film in the US patent US6943070B2 and the People's Republic of China patent CN204808361U. The production process of the TFT image sensing array film is different from the TFT structure of the display panel in that the original pixel opening area of the display panel is changed to the light sensing area in the production process. The TFT preparation method can use thin glass as the base material, or use high-temperature resistant plastic material as the base material, as described in US Patent No. 6,943,070 B2.

The existing TFT image sensing array film is susceptible to the surrounding ambient light or the reflection and refraction of visible light emitted by the pixels of the display screen, causing optical interference, which seriously affects the signal of the TFT image sensing array film embedded under the display panel Signal to noise ratio (SNR), in order to improve the signal to noise ratio, as shown in the figure As shown in 9, the light detection unit of the present invention has been further improved, so that the improved TFT image sensor array film can detect and identify the infrared signal reflected by the user's body part. The specific structure is as follows:

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, and the i-type semiconductor layer is Microcrystalline silicon structure or amorphous silicon germanium 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 band gap is less than 1.7 eV. The amorphous germanium silicide structure is an amorphous semiconductor layer formed by chemical vapor deposition of silane, hydrogen, and germane, and its band gap is less than 1.7 eV.

Band gap (Band gap) refers to the width of a band gap (in electron volts (eV)). The energy of electrons in a solid cannot be taken continuously, but some discontinuous energy bands. To conduct electricity, there must be Free electrons exist, and the energy band in which free electrons exist is called conduction band (can conduct electricity). To become a free electron, it must obtain enough energy to transition from the valence band to the conduction band. The minimum value of this energy is the band gap. . The band gap is an important characteristic parameter of semiconductors, and its size is mainly determined by the energy band structure of the semiconductor, that is, it is related to the crystal structure and the bonding properties of atoms.

At room temperature (300K), the band gap of germanium is about 0.66 eV. Silane contains germanium. When germanium is added, the band gap of the i-type semiconductor layer will decrease. When it is less than 1.7 eV, It shows that the i-type semiconductor layer can receive light signals in the wavelength range of visible light to infrared light (or near-infrared light). By adjusting the GeH4 concentration of chemical weather deposition, the operating wavelength range of photosensitive diodes containing amorphous or microcrystalline germanium silicide structures can be extended to the light wavelength range of 600nm to 2000nm.

Embodiment two:

On the basis of the first embodiment, in order to improve the quantum efficiency of photoelectric conversion, the amorphous silicon photodiode can also be formed by stacking the p-type/i-type/n-type structure above the double junction. The p-type/i-type/n-type material of the first junction layer of the photodiode still has an amorphous silicon structure, and the p-type/i-type/n-type material above the second junction layer may have a microcrystalline structure, a polycrystalline structure or Doped with compound materials that can extend the photosensitive wavelength range. In short, multiple sets 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 the first embodiment is used. Diode structure.

Example three:

On the basis of the first embodiment or the second embodiment, for each p-type/i-type/n-type structure, the p-type semiconductor layer contained therein may be a multi-layer structure with more than two layers. For example, the p-type semiconductor layer has a three-layer structure, which includes 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 heavily doped with boron (the concentration of boron is more than twice that of the standard process); p2 and p3 adopt a microcrystalline structure and are normally doped with boron (doped according to the standard process concentration), depending on The thinned p2 layer and p3 layer reduce the absorption of light, so that light enters the i layer as much as possible and is absorbed by the i layer, which improves the photoelectric conversion rate; on the other hand, the p2 and p3 layers are doped with normal boron It can effectively avoid the deterioration of the built-in potential due to the heavy doping of the p1 layer. When the p-type semiconductor layer includes a multi-layer structure with other layers, it is similar to this, and will not be repeated here.

Similarly, the n-type semiconductor layer can also have a multi-layer structure with more than two layers. For example, the n-type semiconductor layer has a three-layer structure, which includes 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 heavily doped with phosphorus (the phosphorus content is more than twice the standard process); n1 and n2 adopt a microcrystalline structure, and are normally doped with phosphorus (according to the standard production process), relying on thickness reduction The n1 and n2 layers reduce the absorption of light, so that light enters the i layer as much as possible and is absorbed by the i layer, which improves the photoelectric conversion rate; on the other hand, the normal phosphorus doping of the n1 and n2 layers can effectively avoid The built-in potential is degraded due to heavy doping of the n3 layer. When the n-type semiconductor layer includes a multi-layer structure with other layers, it is similar to this, and will not be repeated here.

Embodiment four:

The TFT image sensing array film (ie, the photodetection array film) is an array formed by photosensitive transistors. The array formed by the photosensitive transistors includes a photosensitive transistor sensing area, and the photosensitive transistor sensing area is provided with a photosensitive film Transistor. As shown in FIG. 10, 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 vertically from bottom to top, the drain 103 and the source 102 are arranged laterally and coplanar; the insulating layer 104 wraps the gate 101, so that the gate 101 and the source 102, the gate 101 and the drain 103 There is no contact between them; there is a gap fit between the source 102 and the drain 103, a photosensitive leakage current channel is formed laterally between the source 102 and the drain 103, and the light absorbing semiconductor layer 105 is arranged in the photosensitive leakage current channel.

Generally, when the TFT is controlled by the gate voltage to operate in the off state, no current will flow between the source and the drain; however, when the TFT is illuminated by a light source, the energy of the light excites electron-hole pairs in the semiconductor, and the TFT The field effect of the structure causes the electron-hole pairs to separate, which in turn causes the TFT to generate photosensitive leakage current. Such photosensitive leakage current characteristics allow TFT arrays to be used in photodetection or photodetection technology. Compared with devices that generally use TFT leakage current as photosensitive thin film transistors, the present invention uses an inverted coplanar field-effect transistor structure to arrange the light-absorbing semiconductor layer on the uppermost light-absorbing layer, which greatly increases the excitation of photoelectrons and improves the photoelectricity. Conversion efficiency.

As shown in FIG. 12, it is a flowchart of a method for manufacturing a photodetection unit according to an embodiment of the present invention. The method is used to prepare the photosensitive thin film transistor (that is, the light detection unit) of the sixth embodiment, and specifically includes the following steps: first, step S1201 is used to coat the gate electrode on the substrate of the pixel thin film transistor by magnetron sputtering. The substrate of the pixel thin-film transistor can be a hard board or a flexible material (such as polyimide); then it proceeds to step S1202, and the insulation is made by chemical vapor deposition or magnetron sputtering coating on the top of the gate. Then go to step S1203 to coat the n-type doped semiconductor layer of the source and drain by chemical vapor deposition on the insulating layer, and coat the metal layer of the source and drain by magnetron sputtering, The source and drain of the preset structure are defined by the yellow photoetching process, and the source and drain are laterally coplanar with a gap fit, and a photosensitive leakage current channel is formed between the source and the drain laterally; and then the step In S1204, a light-emitting and absorbing semiconductor layer is deposited by chemical vapor deposition in the photosensitive leakage current channel.

Embodiment five:

In terms of the well-known field-effect transistor structure, the TFT used as the scan drive and data transmission switch does not need to be specifically designed for the structure that collects the photocurrent between the source and the drain; however, the field-effect transistor is applied to the photosensitive leakage current. In terms of detection, if the electron-hole pairs excited by the light are separated by the field effect, they are driven by the electric field. The moving drift (Drift) path is too long. It is very likely that the photoelectron will have recombined with the hole before the photoelectron can reach the electrode smoothly (Recombination), or the dangling bond of the light-absorbing semiconductor layer itself (Dangling Bond) Defects are captured and cannot effectively contribute to the photocurrent output for photodetection. In order to improve the photosensitive leakage current affected by the length of the channel between the source and the drain, so as to increase the area of the light-absorbing semiconductor without deteriorating the photoelectric conversion efficiency, the source and drain of the fourth embodiment are compared in this embodiment. With a further improvement, a new structure of source and drain is proposed.

As shown in FIG. 11, the number of the source and the drain is multiple, the source and the source are connected in parallel with each other, and the drain and the drain are connected in parallel with each other; the gap between the source and the drain is In cooperation, the formation of a photosensitive leakage current channel between the source and the drain laterally includes: forming a first gap between adjacent sources, one drain is placed in the first gap, and a first gap is formed between adjacent drains. There are two gaps, one source is placed in the second gap, and the source and the drain are alternately arranged with gap fit. The distance between each source electrode and the adjacent drain electrode is less than the electron drift distance, which is the distance that electrons can survive under the action of the field effect. In this way, in each detection pixel, multiple sources of the same pixel are connected in parallel, and multiple drains of the same pixel are also connected in parallel, which can effectively reduce the probability of recombination of photo-excited electrons and holes. The success rate of the electrode collecting photoelectrons under the action of the field effect is improved, and the photosensitivity of the TFT leakage current photosensitive thin film transistor is maximized.

In the step by step process of preparing the photosensitive thin film transistor (ie, the light detecting unit) of Example 5, the general steps are similar to those of preparing the photosensitive thin film transistor of Example 4. The difference is that when preparing the source and drain, in step S1203, the source and drain of the preset structure are defined by the yellow photoetching process, so that the source and drain are laterally coplanar and have a clearance fit, and make the source The formation of a photosensitive leakage current channel between the electrode and the drain laterally" includes: the source electrode group and the drain electrode group are defined by the yellow light etching process, each source electrode group includes a plurality of sources, one of the source and the source Each drain electrode group includes a plurality of drains, the drains and the drains are connected in parallel with each other; a first gap is formed between adjacent sources, and a drain is placed in the first gap, A second gap is formed between the adjacent drains, one source is placed in the second gap, and the source and the drain are alternately arranged with a gap fit.

In some embodiments, the light detection array film is used to receive the detection trigger signal, is in the light detection state, and receives the light signal reflected by the detection part (such as fingerprints, eyeballs, iris, etc.) to capture the user The detection position information; and used to receive the light source trigger signal, and it is in the state of emitting light source (such as infrared light source). Preferably, the light source trigger signal and the detection trigger signal are alternately switched and conform to a predetermined frequency. Take the light-detecting array film as an array formed by photosensitive diodes as an example. In the actual application process, a bias voltage (including forward bias, zero bias or negative bias can be applied by TFT for scanning drive). ) Between the p-type/i-type/n-type photodiodes, the TFT image sensing array film can emit infrared light.

Specifically, a forward bias, or a zero bias or a negative bias can be alternately applied between the p-type/i-type/n-type infrared photosensitive diodes to trigger the first trigger signal or the second trigger signal. Taking an array of infrared photosensitive diodes with 10 columns of pixel dot matrix as an example, in the first period, a forward bias is applied to the p-type/i-type/n-type infrared photosensitive diode to make 10 columns of pixel dot matrix All are in the state of emitting infrared light; in the second period, zero bias or negative bias is applied to the p-type/i-type/n-type infrared photosensitive diode, so that the 10 columns of pixel lattices are in the infrared light detection state, and To capture the infrared light information reflected by the user’s eyeballs and generate the corresponding infrared image output; in the third period, a forward bias is applied to the p-type/i-type/n-type infrared photosensitive diode to make 10 rows The pixel dots are all in the state of emitting infrared light, alternating repeatedly, and so on. Further, the light source trigger signal (ie, the first trigger signal) and the detection trigger signal (ie, the second trigger signal) are alternately switched, and the switching frequency conforms to a predetermined frequency. The time interval between adjacent cycles can be set according to actual needs, and the preferred time interval can be set to the TFT array driving scan every frame (Frame) infrared photosensitive diode array can receive at least one frame of complete image signal The time, that is, the preset frequency is to switch every time the above-mentioned time interval has elapsed.

The touch element operation method and device for synchronously verifying fingerprint information described in the above technical solution are applied to a touch element operating device for synchronously verifying fingerprint information. The device includes a display unit and a sensing unit, and the display unit A fingerprint recognition area is provided on the fingerprint recognition area, the sensing unit is located below the fingerprint recognition area, and is used to obtain fingerprint information on the fingerprint recognition area; the display unit is used to display at least one touch in the fingerprint recognition area element. The method includes the following steps: receiving a user's finger For the operation instructions of the touch element, the fingerprint information corresponding to the user's finger is synchronously collected. The above solution can effectively reduce the operation steps of user fingerprint collection and improve user experience.

It should be noted that although the foregoing embodiments have been described in this article, they do not limit the scope of patent protection of the present invention. Therefore, based on the innovative concept of the present invention, changes and modifications to the embodiments described herein, or equivalent structures or equivalent process transformations made by using the contents of the description and drawings of the present invention, directly or indirectly apply the above technical solutions In other related technical fields, they are all included in the scope of patent protection of the present invention.

S1301~S1304: Flow chart steps

Claims (10)

A touch element operation method for synchronously verifying fingerprint information is characterized in that the method is applied to a touch element operating device for synchronously verifying fingerprint information. The device includes a display unit and a sensing unit, and the display unit is provided with The fingerprint recognition area, the sensing unit is located below the fingerprint recognition area, and is used to obtain fingerprint information on the fingerprint recognition area; the display unit is used to display at least one touch element in the fingerprint recognition area; The sensing unit is a photodetection array film, the photodetection array film includes a plurality of pixel detection areas, and each pixel detection area is correspondingly provided with a pixel film circuit composed of thin film transistors and a photodetection unit; The method includes the following steps: receiving operation instructions of the user's finger on the touch element, and synchronously collecting fingerprint information corresponding to the user's finger. The touch element operation method for synchronously verifying fingerprint information as described in the first item of the scope of patent application, wherein the method further includes the following steps: determining whether to execute the operation instruction on the touch element according to the fingerprint information collected synchronously; Specifically, it includes: judging whether the fingerprint information corresponding to the user's finger of the synchronous collection matches the preset fingerprint information, if so, the operation instruction is executed, otherwise the operation instruction is not executed. As described in the first item of the scope of patent application, the touch element operation method for synchronously verifying fingerprint information, wherein the light detecting unit includes a photosensitive diode or a photosensitive transistor. As described in item 3 of the scope of patent application, the touch element operation method for synchronously verifying fingerprint information, wherein the light detecting film is an array formed by photosensitive diodes, and the photosensitive diodes include photosensitive diodes In the sensing area, a photosensitive diode layer is arranged in the photosensitive diode sensing area, and the photosensitive diode layer includes a p-type semiconductor layer, an i-type semiconductor layer, an n-type semiconductor layer, a p-type semiconductor layer, and an i-type semiconductor layer , The n-type semiconductor layer is stacked from top to bottom, and the i-type semiconductor layer has a microcrystalline silicon structure or an amorphous silicon germanium structure. As described in item 3 of the scope of patent application, the touch element operation method for synchronously verifying fingerprint information, wherein the light detecting film is an array formed by photosensitive transistors, and the photosensitive transistors include a photosensitive transistor sensing area, The photosensitive thin film transistor sensing area is provided with a photosensitive thin film transistor, the photosensitive thin film transistor includes a gate, a source electrode, a drain electrode, an insulating layer, and a light absorbing semiconductor layer; the photosensitive thin film transistor has an inverted coplanar structure , The inverted coplanar structure includes: the gate, the insulating layer, and the source are arranged vertically from bottom to top, the drain and the source are arranged laterally coplanar; the insulating layer wraps the gate to The gate and the source, and the gate and the drain are not in contact; there is a gap fit between the source and the drain, a photosensitive leakage current channel is formed between the source and the drain laterally, and the light absorbing semiconductor layer is arranged on In the photosensitive leakage current channel. As described in the first item of the scope of patent application, the touch element operation method for synchronously verifying fingerprint information, wherein the fingerprint recognition area includes a plurality of fingerprint recognition sub-areas, and each fingerprint recognition sub-areas is correspondingly provided with a sensing unit; The method includes: receiving a user's start instruction of the fingerprint recognition sub-area, and turning on the sensing unit under the fingerprint recognition sub-area; Or, receiving a user's instruction to close the fingerprint recognition sub-area, and close the sensing unit below the fingerprint recognition sub-area. As described in the first item of the scope of patent application, the touch element operation method for synchronously verifying fingerprint information, wherein the display unit is a self-luminous diode display screen, and the device further includes a cover glass, a touch screen, Optical glue, optical device; the cover glass, touch screen, self-luminous diode display screen, optical glue, optical device, and sensing unit are arranged from top to bottom; the touch screen is attached to the cover The lower surface of the plate glass, the optical glue is attached to the lower surface of the self-luminous diode display screen; the refractive index of the optical glue is less than the refractive index of the cover glass, and the self-luminous diode display screen includes multiple The device further includes a processor; the synchronous collection of fingerprint information corresponding to the user’s finger includes: the processor sends a display drive signal to the user when the touch screen detects the touch signal of the user’s finger Light-emitting diode display screen; when the display pixel receives the display drive signal of the processor, it emits a light signal, and the light signal is reflected on the upper surface of the cover glass to form a reflected light signal; the optical glue changes the optical path of the reflected light signal , Filtering the reflected light signal in the reflected light signal whose incident angle of the optical glue is greater than the first critical angle to obtain the first reflected light signal, and make the first reflected light signal enter the optical device; the first critical angle is the reflection The critical angle at which the optical signal can be totally reflected on the surface of the optical glue; the optical device changes the optical path of the first reflected optical signal to the first reflected optical signal whose incident angle on the surface of the optical device is smaller than the first critical angle Filtering is performed to obtain the second reflected light signal, and the second reflected light signal enters the sensing unit at an incident angle smaller than the preset angle; the second critical angle is that the reflected light signal can be totally reflected on the upper surface of the cover glass The critical angle; the processor generates and outputs fingerprint information according to the second reflected light signal received by the sensing unit. As described in item 6 of the scope of patent application, the touch element operation method for synchronously verifying fingerprint information, wherein the self-luminous diode display screen includes MxN display pixels; the method includes: The signal sequentially drives a single display pixel or a display pixel array on the display screen to emit a light signal to form a light spot on the upper surface of the cover glass or a combination of light spots to scan the user's finger to form a reflected light signal. A touch element operating device for synchronously verifying fingerprint information, characterized in that the device includes a display unit, a sensing unit, a processor and a computer program, the display unit is provided with a fingerprint recognition area, and the sensing unit is located The bottom of the fingerprint recognition area is used to obtain fingerprint information on the fingerprint recognition area; the display unit is used to display at least one touch element in the fingerprint recognition area; the sensing unit is a light detection array film , The photodetection array film includes a plurality of pixel detection areas, and each pixel detection area is correspondingly provided with a pixel film circuit composed of thin film transistors and a photodetection unit; the computer program is executed when the processor is executed The following steps: receiving the operation instruction of the user's finger on the touch element, and controlling the sensing unit to synchronously collect the fingerprint information corresponding to the user's finger. As described in item 9 of the scope of patent application, the touch element operation device for synchronously verifying fingerprint information, wherein the display unit is a self-luminous diode display screen, and the device further includes a cover glass, a touch screen, Optical glue, optical device; the cover glass, touch screen, self-luminous diode display screen, optical glue, optical device, and sensing unit are arranged from top to bottom; the touch screen is attached to the cover The lower surface of the plate glass, the optical The glue is attached to the lower surface of the self-luminous diode display screen; the refractive index of the optical glue is smaller than the refractive index of the cover glass, the self-luminous diode display screen includes a plurality of display pixels; the device further includes The processor; the control and sensing unit synchronously collecting fingerprint information corresponding to the user's finger includes: the processor sends a display drive signal to the self-luminous diode display when the touch signal of the user's finger is detected by the touch screen When the display pixel receives the display drive signal of the processor, it sends out a light signal, and the light signal is reflected on the upper surface of the cover glass to form a reflected light signal; the optical glue changes the optical path of the reflected light signal to reflect the light signal In the optical glue, the reflected light signal whose incident angle is greater than the first critical angle is filtered to obtain the first reflected light signal, and make the first reflected light signal enter the optical device; the first critical angle is that the reflected light signal can enter the optical device. The critical angle at which total reflection occurs on the glue surface; the optical device changes the optical path of the first reflected optical signal, and filters the first reflected optical signal whose incident angle on the surface of the optical device is smaller than the first critical angle in the first reflected optical signal to obtain the first reflected optical signal. 2. Reflect the light signal, and make the second light signal enter the sensing unit at an incident angle smaller than the preset angle; the second critical angle is the critical angle at which the reflected light signal can be totally reflected on the upper surface of the cover glass; processing The sensor generates and outputs fingerprint information according to the second reflected light signal received by the sensing unit.

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