Display screen integrated with fingerprint recognition function

Abstract

The application discloses a display screen integrated with a fingerprint identification function, which comprises a plurality of display pixel units arranged in an array, each display pixel unit comprising three sub-pixel units of red, green and blue; the plurality of display pixel units are arranged on a substrate and connected with a driving circuit, and display relevant image content under the driving of the display driving circuit; when fingerprint identification is needed, a fingerprint identification driving circuit drives part of the display sub-pixel units to serve as a light source to irradiate a fingerprint of a user placed on the screen, and meanwhile, the fingerprint identification driving circuit drives part of the display sub-pixel units to serve as a detector to collect the fingerprint signal and feed back to an image acquisition circuit to form a fingerprint image; the display screen provided by the application integrates the two functions of display and fingerprint identification, does not need to separately set a fingerprint identification module, and saves internal space of the display screen; and the technology can be applied to full-screen fingerprint identification.

Description

Technical Field

[0001] This invention relates to the fields of display screens and fingerprint recognition technology, and more particularly to a display screen with integrated fingerprint recognition function. Background Technology

[0002] Fingerprint recognition unlocking has become the default solution for most smartphones and is the primary biometric authentication method. From a technical perspective, there are currently several fingerprint recognition solutions, including capacitive sensors, optical sensors, and ultrasonic sensors. Since the iPhone 5S, capacitive fingerprint recognition has become the mainstream solution, and almost all mobile phones now use capacitive sensor fingerprint recognition.

[0003] However, capacitive fingerprint recognition requires a fixed area on the phone screen as the fingerprint recognition area, and prolonged use can cause fingerprint recognition to become less sensitive, affecting the user experience. Therefore, existing technology has shortcomings and needs improvement. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a display screen with integrated fingerprint recognition function to overcome the shortcomings of the prior art, including mobile phone display screen, computer display screen, iPad display screen, smartwatch display screen, etc., which can be used for full-screen fingerprint recognition while saving internal space of the display screen.

[0005] The technical solution of the present invention is as follows:

[0006] A display screen integrating fingerprint recognition function includes multiple display pixel units arranged in an array, each display pixel unit including three sub-pixel units: red, green, and blue. The multiple display pixel units are arranged in an array on a substrate and connected to a driving circuit. Under the drive of the display driving circuit, relevant image content is displayed. When fingerprint recognition is required, the fingerprint recognition driving circuit drives the sub-pixel units as light sources to emit light to illuminate the fingerprint placed on the screen by the user. At the same time, the fingerprint recognition driving circuit drives different sub-pixel units as detectors to acquire the fingerprint image and feed it back to the image acquisition circuit to form a fingerprint image. After fingerprint acquisition or fingerprint unlocking is completed, the fingerprint recognition driving circuit is turned off, and the display screen continues to display relevant image content.

[0007] In the aforementioned display screen with integrated fingerprint recognition function, the red, green, and blue sub-pixel units are all perovskite diodes.

[0008] The integrated fingerprint recognition display screen is described in which the monochromatic light source driven by the fingerprint recognition driving circuit is one or more of red, green and blue sub-pixel units.

[0009] The integrated fingerprint recognition display screen has a detector driven by a fingerprint recognition driving circuit that is a red, green, or blue sub-pixel unit.

[0010] The display screen with integrated fingerprint recognition function has a perovskite diode whose functional layer is made of perovskite material, including three-dimensional perovskite, quasi-two-dimensional layered perovskite, two-dimensional perovskite, and quantum dot perovskite.

[0011] The display screen with integrated fingerprint recognition function, wherein the perovskite diode has both light-emitting and detection functions.

[0012] The display screen provided by this invention integrates both display and fingerprint recognition functions, eliminating the need for a separate fingerprint recognition module and saving internal space of the display screen; this technology can be applied to full-screen fingerprint recognition. Attached Figure Description

[0013] Figure 1 A schematic diagram of a display screen with integrated fingerprint recognition function;

[0014] Figure 2 This is a graph showing the external quantum efficiency versus current density of the device in Example 1.

[0015] Figure 3 The emission spectrum of the device in Example 1 is shown.

[0016] Figure 4 The device current density-voltage curve and brightness-voltage curve are shown in Example 1;

[0017] Figure 5 The diagram shows the device detection response speed performance of Example 1;

[0018] Figure 6 The diagram shows the linear range performance of the device in Example 1. Detailed Implementation

[0019] The present invention will be described in detail below with reference to specific embodiments.

[0020] refer to Figure 1 The integrated fingerprint recognition display includes multiple display pixel units arranged in an array, each display pixel unit comprising three sub-pixel units: red, green, and blue. The array of multiple display pixel units is arranged on a substrate 3 and connected to a driving circuit, displaying relevant image content under the drive of the display driving circuit. When fingerprint recognition is required, the fingerprint recognition driving circuit drives one or more combinations of the red, green, and blue sub-pixel units in the pixel unit (e.g., ...). Figure 1 The blue unit 1 in the middle acts as a light source, illuminating the fingerprint placed on the screen by the user. At the same time, the fingerprint recognition driving circuit drives different sub-pixel units (e.g., Figure 1 The red unit 2) acts as a detector, collecting the fingerprint signal and feeding it back to the image acquisition circuit to form a fingerprint image. After fingerprint acquisition or fingerprint unlocking is completed, the fingerprint recognition driving circuit is turned off, and the display screen continues to display the relevant image content. The display driving circuit and the fingerprint recognition driving circuit are conventional technologies, and will not be described in detail in this invention.

[0021] The red, green, and blue sub-pixel units are all perovskite diodes;

[0022] The functional layer of the perovskite diode is made of perovskite material, including three-dimensional perovskite, quasi-two-dimensional layered perovskite, two-dimensional perovskite, and quantum dot perovskite.

[0023] Example 1

[0024] The substrate is a glass-ITO composite, the electron transport-hole blocking layer is ZnO / PEIE, the light-emitting layer is a novel perovskite thin film, the hole transport-electron blocking layer is TFB, and the top electrode is MoO. x / Au, the overall device structure is described as: glass substrate / ITO / ZnO-PEIE / Perovskite / TFB / MoO x / Au. The preparation method is as follows:

[0025] The transparent conductive substrate ITO glass was ultrasonically cleaned using acetone solution, ethanol solution, and deionized water, and then dried with dry nitrogen gas. The ITO on the glass substrate serves as the anode layer of the device, and the sheet resistance of the ITO is 15 Ω / □.

[0026] The dried substrate was moved into a vacuum chamber and the ITO glass was pretreated with ultraviolet ozone for 10 minutes in an oxygen environment.

[0027] ZnO and PEIE were spin-coated onto the pretreated substrate and annealed. The substrate was then transferred to a nitrogen glove box. A precursor solution with a molar ratio of 5AVA, NH2CH=NH2I, CsI, NH2CH=NH2Br and PbI2 of 0.3:2:0.5:1:1 was spin-coated onto the substrate and annealed to obtain a perovskite film with a novel film structure. TFB solution was spin-coated over the light-emitting layer as a hole transport layer.

[0028] MoO was prepared after the preparation of each functional layer. x / Au composite electrode preparation, gas pressure 6×10 -7 Torr, with a deposition rate of 0.1 nm / s, and the deposition rate and thickness were monitored by a film thickness gauge.

[0029] The fabricated device was encapsulated in a glove box with a 99.9% nitrogen atmosphere.

[0030] The current-voltage-brightness characteristics of the device were tested, as well as the emission spectrum parameters of the device.

[0031] The external quantum efficiency-current density curve, emission spectrum, and current density-brightness-voltage curve of the device when used as a light source are shown below. Figure 2 As shown in Figures 3 and 4. The same type of perovskite light-emitting diodes as described above can be used in the fingerprint recognition module. Devices not used as fingerprint recognition light sources are selected as detectors. The device's detection response speed performance is as follows: Figure 5 As shown, the device's linear range performance is as follows: Figure 6 As shown.

[0032] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A display screen integrating fingerprint recognition function, characterized in that, The device includes multiple display pixel units arranged in an array, each display pixel unit comprising three sub-pixel units: red, green, and blue. These multiple display pixel units are arrayed on a substrate and connected to a driving circuit. Under the drive of the display driving circuit, relevant image content is displayed. When fingerprint recognition is required, the fingerprint recognition driving circuit drives the sub-pixel units as light sources to emit light and illuminate the fingerprint placed on the screen. Simultaneously, the fingerprint recognition driving circuit drives different sub-pixel units as detectors to collect the fingerprint placed on the screen and feed it back to the image acquisition circuit to form a fingerprint image. After fingerprint acquisition or unlocking is completed, the fingerprint recognition driving circuit is turned off, and the display continues to display relevant image content. The red, green, and blue sub-pixel units are all perovskite diodes. The fingerprint recognition light source is one or more combinations of red, green, and blue sub-pixel units. The perovskite diodes have both light-emitting and detection functions, enabling the display unit to integrate fingerprint recognition functionality without the need for a separate fingerprint recognition module.

2. The display screen with integrated fingerprint recognition function according to claim 1, characterized in that, The detector consists of red, green, or blue sub-pixel units.

3. The display screen with integrated fingerprint recognition function according to claim 1, characterized in that, The functional layer of the perovskite diode is made of perovskite material, including three-dimensional perovskite, quasi-two-dimensional layered perovskite, two-dimensional perovskite, and quantum dot perovskite.

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