CN108898003A - A kind of breath screen unlocked by fingerprint method based on quantum dot light emitting device - Google Patents

Abstract

The invention relates to a screen-off fingerprint unlocking method based on a quantum dot light-emitting device. When the electronic device is in the state of a screen-off screen, press the quantum dot light-emitting device embedded in the screen of the electronic device with a finger, light up the unlocking area, and irradiate the finger. And trigger the fingerprint unlock command; start the camera unit embedded in the screen of the electronic device and located under the quantum dot light-emitting device, take pictures through the quantum dot light-emitting device, and obtain the image information of the fingerprint to be tested; the electronic device will obtain the fingerprint to be tested The image information is matched with the preset fingerprint image stored in the electronic device, and if the fingerprint matching is successful, the electronic device executes an unlocking instruction. The method proposed by the invention can improve accuracy, omit the intermediate steps of sensor transmission, save manufacturing space, speed up fingerprint comparison, improve unlocking efficiency, and enhance user experience.

Description

A fingerprint unlocking method based on quantum dot light-emitting devices

technical field

The invention relates to the technical field of fingerprint identification, in particular to an off-screen fingerprint unlocking method based on a quantum dot light-emitting device.

Background technique

Aiming at the problem of poor stability of light-emitting materials of organic small molecules and organic polymers, semiconductor quantum dots are expected to become an ideal substitute for overcoming the stability of organic light-emitting diodes (OLEDs). applications have attracted considerable attention. This growing attention stems from the unique properties of quantum dots, which can be fabricated by processes such as spin-coating, inkjet printing, and roll-to-roll manufacturing, making them excellent candidates for low-cost, high-quality, flexible display devices.

Since the fingerprint is a person's special identity label, it can accurately indicate the user's identity, and the fingerprint recognition only needs to lightly press the screen to make the electronic device recognize the fingerprint for authentication, which makes the application prospect of fingerprint unlocking broad, especially in many portable devices. in electronic products. At present, with the continuous advancement of technology, devices such as smart phones and tablet computers are becoming more and more popular, and fingerprint unlocking has also become a basic function. Fingerprint unlocking is divided into bright screen and off-screen methods. Bright screen unlocking is a method for smart terminals to use fingerprints to enter the system when the screen is on; off-screen unlocking is a method for smart terminals to use fingerprints to enter the system when the screen is off. systematic approach.

The optical fingerprint unlocking method mainly uses light reflection imaging to identify the user's fingerprint. At present, the optical fingerprint unlocking commonly used for unlocking the screen mostly uses the sensor to transmit signals to wake up the system, which takes a long time.

Contents of the invention

The purpose of the present invention is to provide a fingerprint unlocking method based on a quantum dot light-emitting device, so as to overcome the defects in the prior art.

In order to achieve the above object, the technical solution of the present invention is: a method for unlocking fingerprints based on a quantum dot light-emitting device for off-screen fingerprints. When the electronic device is in a state of off-screen, the quantum dot light-emitting device embedded in the screen of the electronic device is pressed by a finger. , light up the unlocking area, irradiate the finger, and trigger the fingerprint unlocking command; start the camera unit embedded in the screen of the electronic device and located below the quantum dot light-emitting device, take pictures through the quantum dot light-emitting device, and obtain the Fingerprint image information: the electronic device matches the obtained fingerprint image information to be tested with the preset fingerprint image stored in the electronic device, and if the fingerprint matching is successful, the electronic device executes an unlocking instruction.

In an embodiment of the present invention, the camera unit acquires image information of a plurality of fingerprints to be tested at different positions of the finger.

In an embodiment of the present invention, the electronic device performs preliminary feature processing according to the image collected by the camera unit, and judges whether it is fingerprint image information; if the acquired image is not fingerprint image information, the system automatically shuts down, and the screen of the electronic device returns to In the off-screen state, wait for the fingerprint unlock command again.

In an embodiment of the present invention, the fingerprint image information includes a complete image of the fingerprint image information to be tested or a partial image of the fingerprint image information to be tested.

In an embodiment of the present invention, the acquired fingerprint image information to be tested is matched with a plurality of preset fingerprint images stored in the electronic device, and if at least one of the preset fingerprint images is successfully matched, the electronic device performs unlocking. instruction.

In an embodiment of the present invention, the quantum dot light-emitting device includes sequentially arranged from bottom to top: ITO glass layer, hole injection layer, hole transport layer, quantum dot layer, electron transport layer, and a flexible flexible film with a transparent conductive film. PET top electrode layer.

In an embodiment of the present invention, the ITO glass layer, the hole injection layer, the hole transport layer, the quantum dot layer, and the electron transport layer are used as the lower layer components of the quantum dot light-emitting device, and the flexible transparent conductive film The PET top electrode layer is used as the upper layer component of the quantum dot light-emitting device, and the upper layer component and the lower layer component are separately arranged in the screen of the electronic device; by pressing the flexible PET top electrode layer, the electron transport layer is in contact with the lower layer component, The quantum dot light-emitting device is turned on and then emits light.

In one embodiment of the present invention, the electrodes used in the flexible PET substrate with the transparent conductive film are linear electrodes.

In an embodiment of the present invention, the quantum dot light-emitting device is prepared according to the following steps:

Step 1: Continuously clean the substrate ITO glass and the flexible PET substrate with ITO transparent conductive film with acetone, ethanol and deionized water for 15 minutes each, and then treat with ozone generated by ultraviolet rays in the air for 10 minutes;

Step 2: Spin-coat the PEDOT:PSS solution on the ITO glass substrate at 3000rpm for 40 seconds, and then bake it under a constant temperature heating table at 120°C for 20 minutes;

Step 3: Transfer the coated substrate to a _N2 -filled glove box, deposit TFB in chlorobenzene solvent at a fixed speed of 3000 rpm for 40 s, and then bake it under a constant temperature heating table at 120 °C for 20 min;

Step 4: Dissolve CdSe/ZnS quantum dots in n-octane, spin-coat at 2000 rpm for 40 s, and then anneal for 5 min in a 100°C constant temperature heating stage;

Step 5: Spin-coat the ZnO solution dissolved in n-butanol at a speed of 1500 rpm for 40 s, and then anneal for 10 min in a constant temperature heating platform at 100°C;

Step 6: Load the cleaned flexible PET top electrode layer containing transparent conductive film on top of the lower component.

Compared with the prior art, the present invention has the following beneficial effects: an off-screen fingerprint unlocking method based on quantum dot light emitting devices, which directly lights up the unlocking area by using the internal quantum dot light emitting devices, which is different from the traditional capacitive fingerprint unlocking method Compared with optical fingerprint unlocking through image comparison, the accuracy can be improved; compared with ordinary sensor optical fingerprint unlocking, the internal quantum dot light-emitting device directly lights up the unlocking area to complete the shooting process, which can omit the intermediate steps of sensor transmission and save energy. Create space, speed up fingerprint comparison, improve unlocking efficiency, and enhance user experience.

Description of drawings

FIG. 1 is a schematic flow chart of a method for unlocking an off-screen fingerprint based on a quantum dot light-emitting device in an embodiment of the present invention.

Fig. 2 is a schematic diagram of a quantum dot light-emitting device in an embodiment of the present invention.

Fig. 3 is a schematic diagram of fingerprint image collection and unlocking process in the embodiment of the present invention.

Detailed ways

The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

The present invention provides a method for unlocking an off-screen fingerprint based on a quantum dot light-emitting device, as shown in Figure 1, comprising the following steps:

Step 11: The electronic device receives a fingerprint unlocking instruction.

In this embodiment, the received instruction may be a fingerprint unlock instruction issued by the user's finger pressing the screen, or an unlock instruction triggered by a switch on the electronic device. When the electronic device is in the off-screen state, press the quantum dot light-emitting device embedded in the screen of the electronic device with your finger to light up the unlocking area, irradiate your finger, and trigger the fingerprint unlocking command

Step 12: The electronic device lights up the unlocking area according to the fingerprint unlocking instruction.

In this embodiment, the electronic device lights up the unlocking area by using an internal quantum dot light-emitting device to light up.

Step 13: The electronic device controls the camera unit to obtain the fingerprint information to be tested according to the fingerprint unlocking instruction.

In this embodiment, in this step, according to the received fingerprint unlocking instruction, start the camera unit located under the quantum dot light-emitting device to acquire images. According to the preliminary processing of the collected image features, it is determined whether it is fingerprint information. When the acquired image is not fingerprint information, the system automatically shuts down, and the screen returns to the off-screen state to wait for fingerprint information again. When the acquired image is confirmed to be fingerprint information after preliminary judgment, proceed to the next step.

In this embodiment, the camera unit acquires image information of a plurality of fingerprints to be tested at different positions of the finger. The acquired fingerprint image can be a complete image of the fingerprint to be tested, or a partial image of the fingerprint to be tested.

Step 14: The electronic device matches the acquired fingerprint image with the preset fingerprint image, and performs an unlocking operation;

In this embodiment, whether to execute the fingerprint unlocking operation is responded according to the matching result. If the matching is unsuccessful, return to step 12 to continue collecting new fingerprint image information to be tested. If the fingerprint image to be tested matches at least one of the preset plurality of fingerprint image data successfully, the program of executing the unlocking instruction ends.

Further, in the process of lighting up the unlocking area through the fingerprint unlocking command to control the camera unit to acquire the fingerprint image, and matching the acquired fingerprint image to perform the fingerprint unlocking operation, the lighting process of the screen unlocking area in the off-screen state is a key step . In the existing fingerprint unlocking technology, the optical fingerprint unlocking method is that the pressure sensor system detects the fingerprint pressing unlock command of the electronic device when the screen of the electronic device is in the off-screen state, and drives the unlocking area to light up through the pressure sensor transmission signal to help The camera unit acquires fingerprint information to be tested. Therefore, in the process of signal transmission by the pressure sensor to drive the lighting of the unlocking area, the speed at which the electronic device acquires the fingerprint to be tested will be affected to a certain extent, and the unlocking efficiency will be affected. The invention provides an optimized method of using quantum dot light-emitting devices to directly drive and light up the unlocking area. Compared with the common sensor sensing light-up method, faster light-up can be used as a new function of the product.

Further, as shown in Figure 2, the quantum dot light-emitting device applied in the fingerprint unlocking method proposed by the present invention is manufactured on a flexible PET substrate with an ITO transparent conductive film and an ITO transparent glass substrate using QLED, so as to have a transparent conductive film. The flexible PET substrate is the upper electrode, and the lower device is prepared on the ITO glass substrate; after the ITO glass substrate is cleaned, the surface is treated with ultraviolet ozone or oxygen plasma, and then PEDOT is prepared on the substrate in the following order: PSS, TFB, CdSe / ZnS quantum dots, ZnO nanoparticles and other functional layers to prepare the underlying device.

Specifically, the quantum dot light-emitting device is prepared according to the following steps:

Step 21: The substrate ITO glass and the PET substrate were continuously cleaned with acetone, ethanol and deionized water for 15 minutes each, and then treated with ozone generated by ultraviolet rays in the air for 10 minutes;

Step 22: Spin-coat the PEDOT:PSS solution on the ITO glass substrate at 3000rpm for 40 seconds, and then bake it under a constant temperature heating table at 120°C for 20 minutes;

Step 23: Transfer the coated substrate to a N filled glove box, deposit TFB ( ₈ mg/mL) in chlorobenzene solvent at a fixed speed of 3000 rpm for 40 s, and then bake under a constant temperature heating stage at 120 °C Bake for 20 minutes;

Step 24: Dissolve CdSe/ZnS quantum dots in n-octane (13 mg/mL), spin-coat at 2000 rpm for 40 s, and then anneal in a constant temperature heating stage at 100 °C for 5 min;

Step 25: Spin-coat the ZnO solution (10 mg/mL) dissolved in n-butanol at a speed of 1500 rpm for 40 s, and then anneal for 10 min in a constant temperature heating platform at 100°C;

Step 26: Place the cleaned flexible PET sample containing the ITO transparent conductive layer on top of the lower component to construct a QLED device;

Further, the types of functional layers and types of quantum dots used in the manufacturing process of the above quantum dot light-emitting devices mentioned in this embodiment, including spin coating speed, solution concentration, solvent selection, annealing temperature and annealing time are not completely fixed, It can be adjusted appropriately as needed.

In this embodiment, the quantum dot light-emitting device exists in the screen in a way that the upper electrode is separated from the lower device. When the finger presses the screen, the upper electrode and the lower device are in contact with each other, and the quantum dot light-emitting device is turned on and directly emits light. And light up the press area screen, and continue to perform subsequent shooting comparison and unlocking operations.

Further, as shown in FIG. 3, complete the unlocking of the electronic device according to the following steps:

Step 31: The electrodes used on the transparent flexible PET of the quantum dot light-emitting device are linear electrodes. The advantage of the linear electrodes is that most of the transparent glass substrate can be effectively exposed, and the fingerprint of the finger to be tested can pass through the glass substrate, which is convenient for the camera unit 33 to collect The fingerprint image information to be tested;

Step 32: The QLED32 (except the electrode) part receives the fingerprint unlocking command by pressing the PET layer 31 with the finger 35, and the electronic device lights up the unlocking area according to the fingerprint unlocking command.

Step 33: The electronic device controls the camera unit to obtain the fingerprint information to be tested according to the fingerprint unlocking instruction.

Step 34: The electronic device matches the acquired fingerprint image with the preset fingerprint image, confirms that the fingerprint and the preset fingerprint image data are successfully matched, and the system executes the fingerprint unlocking operation.

In this embodiment, the electronic device further includes a processor 34 for data processing.

The above are the preferred embodiments of the present invention, and all changes made according to the technical solution of the present invention, when the functional effect produced does not exceed the scope of the technical solution of the present invention, all belong to the protection scope of the present invention.

Claims (8)

1. A method for unlocking an off-screen fingerprint based on a quantum dot light-emitting device, characterized in that, when the electronic device is in a state of off-screen, pressing the quantum dot light-emitting device embedded in the screen of the electronic device with a finger to light up the unlocking area, Illuminate the finger, and trigger the fingerprint unlocking command; start the camera unit embedded in the screen of the electronic device and located under the quantum dot light emitting device, take pictures through the quantum dot light emitting device, and obtain the fingerprint image information to be tested; the electronic device The acquired fingerprint image information to be tested is matched with the preset fingerprint image stored in the electronic device, and if the fingerprint matching is successful, the electronic device executes an unlocking instruction. 2. A method for unlocking fingerprints based on quantum dot light-emitting devices according to claim 1, wherein the camera unit acquires a plurality of fingerprint image information to be tested at different positions of the finger. 3. A method for unlocking screen fingerprints based on quantum dot light-emitting devices according to claim 1, wherein the electronic device performs preliminary feature processing according to the image collected by the camera unit, and judges whether it is fingerprint image information ; If the acquired image is not fingerprint image information, the system automatically shuts down, the screen of the electronic device returns to the off-screen state, and waits for the fingerprint unlocking command again. 4. A method for unlocking screen fingerprints based on quantum dot light-emitting devices according to claim 1, wherein the fingerprint image information includes a complete image of the fingerprint image information to be tested or a partial image of the fingerprint image information to be tested . 5. A method for unlocking screen fingerprints based on quantum dot light-emitting devices according to claim 1, wherein the obtained fingerprint image information to be tested is combined with a plurality of preset fingerprint images stored in the electronic device Matching is performed, and if at least one preset fingerprint image is successfully matched, the electronic device executes an unlocking instruction. 6. A method for unlocking screen fingerprints based on a quantum dot light-emitting device according to claim 1, wherein the quantum dot light-emitting device comprises sequentially arranged from bottom to top: ITO glass layer, hole injection layer, A hole transport layer, a quantum dot layer, an electron transport layer, and a flexible PET top electrode layer with a transparent conductive film. 7. A method for unlocking fingerprints based on a quantum dot light-emitting device according to claim 6, wherein the ITO glass layer, hole injection layer, hole transport layer, quantum dot layer, electron transport layer As the lower component of the quantum dot light-emitting device, the flexible PET top electrode layer with a transparent conductive film is used as the upper component of the quantum dot light-emitting device, and the upper component and the lower component are separately arranged in the screen of the electronic device ; By pressing the flexible PET top electrode layer with a finger, the electron transport layer is in contact with the lower component, and the quantum dot light-emitting device is turned on, and then emits light. 8. A method for unlocking screen fingerprints based on quantum dot light-emitting devices according to claim 7, wherein the quantum dot light-emitting devices are prepared according to the following steps: Step 1: Continuously clean the substrate ITO glass and the flexible PET substrate with transparent conductive film with acetone, ethanol and deionized water for 15 minutes each, and then treat with ozone generated by ultraviolet rays in the air for 10 minutes; Step 2: Spin-coat the PEDOT:PSS solution on the ITO glass substrate at 3000rpm for 40 seconds, and then bake it under a constant temperature heating table at 120°C for 20 minutes; Step 3: Transfer the coated substrate to a _N2 -filled glove box, deposit TFB in chlorobenzene solvent at a fixed speed of 3000 rpm for 40 s, and then bake it under a constant temperature heating table at 120 °C for 20 min; Step 4: Dissolve CdSe/ZnS quantum dots in n-octane, spin-coat at 2000 rpm for 40 s, and then anneal for 5 min in a 100°C constant temperature heating stage; Step 5: Spin-coat the ZnO solution dissolved in n-butanol at a speed of 1500 rpm for 40 s, and then anneal for 10 min in a constant temperature heating platform at 100°C; Step 6: Load the cleaned flexible PET top electrode layer containing transparent conductive film on top of the lower component.