TW201935313A - Identification device maintains light and thin design of the packaging module - Google Patents

Abstract

The identification device suitable for identifying the image of an object comprises a packaging module, a light-emitting module, a photoluminescence layer, and a sensing module. The packaging module has a first surface suitable for the object to get close and capable of transmitting light. The light-emitting module can be used for emitting an initial light. The photoluminescence layer comprises a plurality of quantum dots which can be excited by the initial light to emit an excitation light which is infrared light. The excitation light penetrates out of the packaging module and is irradiated to the object, and reflected back into the packaging module to form a reflected light. The sensing module is used for receiving the reflected light and identifying the image of the object formed by the reflected light. The excitation light will not be interfered by other visible light, which provides the stable identification result. Infrared light is emitted through the photoluminescence layer, and the light and thin design of the packaging module can be maintained.

Description

Identification device

The present invention relates to an identification device, and more particularly to an identification device that uses a user's physiological characteristics to identify an identity.

Identification methods that use fingerprints, faces, and other physiological characteristics to identify and verify the identity of a user are collectively called biometrics. Compared with traditional methods such as entering a password or signing to identify a user, biometrics are more unique and more convenient to use. In the field of biometrics, fingerprint recognition is one of the widely used recognition methods, and fingerprint recognition is divided into optical, capacitive, and ultrasonic methods, such as optical fingerprint acquisition methods. Among them, optical It uses light reflection to capture information, so it has the advantages of low cost and good durability.

Referring to FIG. 1, when a known optical fingerprint recognition device 1 is generally mounted on a mobile device 2 such as a mobile phone or a tablet computer, the mobile device 2 needs to include a touch area 21 for a user to touch. And an identification area 22 for mounting the optical fingerprint identification device 1. The design that separates the touch area 21 and the recognition area 22 is to prevent the light emitted from the optical fingerprint recognition device 1 from being affected by the light source inside the touch area 21 during the reflection process and causing recognition failure. The problem. Therefore, in order to realize that the touch area 21 can also perform the function of fingerprint recognition, some people have proposed that the light source used in the optical fingerprint recognition device 1 is changed from the original visible light to a longer wavelength and does not match the touch area 21 The light sources inside interfere with each other in the infrared light. However, in order to obtain infrared light, an additional infrared light emitting diode must be installed in the mobile device 2. Not only the internal circuit configuration must be redesigned, but also the energy consumption during operation will be increased. In addition, the addition of an infrared light emitting diode will also increase the overall volume of the mobile device 2 and lose the characteristics of lightness, thinness and dexterity, and the manufacturing cost will also increase.

It is therefore an object of the present invention to provide an identification device capable of overcoming at least one of the disadvantages of the prior art.

Therefore, the identification device of the present invention is suitable for identifying an image of an object and includes a packaging module, a light emitting module, a photoluminescent layer, and a sensing module. The packaging module has a first surface that is suitable for the object to approach and is transparent. The light emitting module is disposed in the packaging module and can be used to emit an initial light. The photoluminescent layer is disposed in the packaging module and includes a plurality of quantum dots. The quantum dots can be excited by the starting light to emit an excitation light that is infrared light, and the excitation light will follow a first The path passes through the package module and irradiates the object, and forms a reflected light reflected back into the package module along a second path. The sensing module is disposed on the packaging module and is located on the second path. The sensing module is used for receiving the reflected light and identifying an image of the object formed by the reflected light.

The effect of the present invention is that since the excitation light is infrared light, it will not be interfered by other visible light, which can make the identification result more stable and highly reliable, and the infrared light is emitted through the photoluminescent layer to maintain the package. The thin and light design of the module.

Before the present invention is described in detail, it should be noted that the directions mentioned in this specification are described based on the directions in the drawings, but in practical applications, the directions defined in this specification are not limited.

Referring to FIG. 2, FIG. 3 and FIG. 4, an embodiment of the identification device 3 of the present invention is suitable for identifying an image of an object 4. The object 4 may be a finger with a fingerprint or a human face. In the following description, the The object 4 will be explained by taking a finger as an example. The identification device 3 includes a packaging module 5, a light emitting module 6, a photoluminescent layer 7, and a sensing module 8.

The packaging module 5 is a portable electronic device such as a mobile phone or a tablet computer, or a household device such as a touch-controllable LCD television, an operation panel of a cash dispenser, or an access control machine in a dormitory. The package module 5 includes a touch panel 51 located above and a substrate 52 located below. The touch panel 51 allows light to pass through, and has a first surface 511 suitable for the object 4 to approach and transmit light. The substrate 52 has a second surface 521 opposite to the first surface 511. Among electronic equipment with a screen display function, such as a mobile phone and a tablet computer, the first surface 511 refers to a screen surface that can be used for displaying a screen and for touch operations. It should be noted that the packaging module 5 contains other components such as a circuit board, a polarizing plate, and a liquid crystal layer. However, since the above components are not technical features of the present invention, they will not be described in detail here. On the other hand, the package module 5 is not limited to having a touch function. The package module 5 may also include a glass cover without a touch function. At this time, it is suitable for the object 4 to be near and transparent The first surface 511 may be a surface of the glass cover.

The light emitting module 6 is disposed in the packaging module 5 and includes a plurality of light emitting elements 61 mounted on the substrate 52 and adjacent to the second surface 521. The light emitting elements 61 are light emitting diodes (Light emitting diodes). diode, LED), and can emit a starting light. In this embodiment, the light emitting elements 61 are blue light LEDs, and the initial light is blue light. In other variations of this embodiment, the starting light may also be other colored light that can be matched with the photoluminescent layer 7, and is not limited to blue light. In addition, the light emitting elements 61 may not be provided on the substrate 52 but may be irradiated to the vicinity of the substrate 52 by reflection. It is worth mentioning that when the packaging module 5 is a thin film transistor liquid crystal display (TFTLCD), the light emitting module 6 may be a backlight module in the thin film transistor liquid crystal display. .

The photoluminescent layer 7 is disposed in the packaging module 5 and is located between the touch panel 51 and the substrate 52. The photoluminescent layer 7 includes a plurality of quantum dots 71, and each of the quantum dots 71 may have a perovskite structure or a core-shell structure. Perovskite quantum dot 71 materials such as CsPbX ₃ , X = Cl, Br, I. The core-shell structure includes a core portion 711 located at the center, and a shell portion 712 surrounding the core portion 711. The material of the inner core portion 711 is lead sulfide (PbS), and the material of the outer shell portion 712 is cadmium sulfide (CdS). When the photoluminescent layer 7 is irradiated by the starting light, the quantum dots 71 will be excited by the starting light to emit an excitation light that is infrared light, and the excitation light will follow an upward first path P1 penetrates the first surface 511 of the packaging module 5 and irradiates the object 4. The object 4 reflects light, and then forms a second path P2 reflected back into the packaging module 5. reflected light. The first path P1 and the second path P2 in this embodiment are both perpendicular to the first surface 511, but the implementation is not limited thereto.

The sensing module 8 is disposed in the packaging module 5 and is located above the photoluminescent layer 7. The sensing module 8 includes an imaging unit 81, a data storage unit 82, and an identification unit 83.

The imaging unit 81 is disposed on the second path P2 and is used for the reflected light to form the image of the object 4. In this embodiment, the imaging unit 81 includes a photosensitive element 811 (Charge-coupled Device, CCD) that can be imaged by infrared light. When the reflected light is irradiated to the photosensitive element 811, a fingerprint pattern of a finger can be imaged on the photosensitive element 811. The photosensitive element 811 is, for example, a thin-film photodiode or a transistor light sensor.

The data storage unit 82 has a reference material 821 stored therein. The reference material 821 is a fingerprint image stored in advance by the user. After image processing, several characteristic points in the fingerprint image (such as the endpoint of a fingerprint ridge or The bifurcation point) is extracted, and the type and location of the features are stored as the reference material 821.

The identification unit 83 is connected to the imaging unit 81 and the data storage unit 82 by signals. The recognition unit 83 processes the image formed by the imaging unit 81, finds out several feature points of the image, and positions of the feature points, and finally obtains a set of recognition data 831. The identification unit 83 compares the obtained identification data 831 with the reference data 821 in the data storage unit 82. When the number of feature points matched by the comparison result reaches a threshold, the recognition unit 83 may send a comparison match signal indicating that the fingerprint data of the user matches the data in the data storage unit 82. When the number of matching feature points does not reach the threshold, the identification unit 83 may send a comparison abnormal signal, which indicates that the fingerprint data of the user does not match the data in the data storage unit 82. The package module 5 may be operated by a non-owner.

It should be noted that the method of converting the image into the identification data 831 or the reference material 821 may also have other conversion methods. Since image processing and conversion are not the technical features of the present invention, they are not described here. More details.

When the identification device 3 of the present invention is in use, the user presses a finger (object 4) on the touch panel 51, and the excitation light (infrared light) emitted by the photoluminescent layer 7 is blocked by the finger and reflected to the imaging Unit 81. The identification unit 83 can perform fingerprint identification after detecting that the imaging unit 81 has generated a fingerprint image.

Because the light source used in the identification process is infrared light, it will not interfere with the visible light when the touch panel 51 is used, so the photoluminescent layer 7 and the sensing module 8 can be directly disposed on the touch panel 51 Below, there is no need to separate an identification area 22 for installation as shown in FIG. 1. When the range provided by the photoluminescent layer 7 and the sensing module 8 covers the entire touch panel 51, the fingerprint recognition function can be performed in any area of the touch panel 51, and in the future, mobile phones will become more comprehensive. Under the trend of the screen, the identification device 3 of the present invention is quite competitive. In addition, when the packaging module 5 of the identification device 3 is a display device with a backlight source (such as a TFTLCD), the light emitting module 6 can be replaced by a backlight source, and because the photoluminescent layer 7 is a thin film, it can be maintained The thin and light design of the packaging module 5.

Referring to FIG. 5, another embodiment of the embodiment of the identification device 3 of the present invention. The packaging module 5 further includes a central layer 53 located between the touch panel 51 and the substrate 52. The central layer 53 may be One layer of the multilayer structure of the packaging module 5 is TFTLCD. The central layer 53 may be a polarizer, a glass substrate provided with a thin film transistor, or a color filter. The photoluminescent layer 7 and the sensing module 8 are respectively disposed at two different positions of the central layer 53. The first path P1 and the second path P2 are non-parallel and are formed with the first surface 511. Angle. This design can reduce the area required for the photoluminescent layer 7 and the sensing module 8 and reduce the manufacturing cost.

Referring to FIGS. 4 and 6, another embodiment of the embodiment of the recognition device 3 of the present invention is used in the field of face recognition. The object 4 is the user's face. When the user's face (object 4) faces the first surface 511 of the touch panel 51, the excitation light is radiated to the user's face along the first path P1. And reflects the user's face information along the second path P2 to the imaging unit 81 through reflected light. When applied to face recognition, the reference data 821 stored in the data storage unit 82 is obtained by converting the face image in advance. When performing recognition, the recognition unit 83 analyzes and recognizes the face image of the user, finds several feature points and their positions, and converts them into the recognition data 831. The identification unit 83 compares the identification data 831 with the reference data 821, so that the function of identifying the identity of the user can also be achieved.

In summary, the identification device 3 of the present invention generates excitation light by being excited by the photoluminescent layer 7, and the excitation light is irradiated to a finger or a human face to form the reflected light, which is finally received by the sensing module 8 As well as analyzing the fingerprint of a finger or an image of a human face, since the excitation light is infrared light, the light travelling process will not be interfered by other visible light, the recognition effect is more stable, and the touch panel 51 is used as an image recognition area. There will be no restrictions. In addition, when the packaging module 5 is equipped with a backlight, the thin film design of the photoluminescent layer 7 can maintain the overall lightness and thinness, so it can indeed achieve the purpose of the present invention.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, any simple equivalent changes and modifications made according to the scope of the patent application and the contents of the patent specification of the present invention are still Within the scope of the invention patent.

3‧‧‧Identification device

4‧‧‧ objects

5‧‧‧ Package Module

51‧‧‧Touch Panel

511‧‧‧ the first side

52‧‧‧ substrate

521‧‧‧Second Side

53‧‧‧ Central Level

6‧‧‧light emitting module

61‧‧‧Light-emitting element

7‧‧‧photoluminescent layer

71‧‧‧ Quantum Dots

711‧‧‧Core Department

712‧‧‧Shell

8‧‧‧ Sensor Module

81‧‧‧ imaging unit

811‧‧‧ Photosensitive element

82‧‧‧data storage unit

821‧‧‧Reference

83‧‧‧Identification unit

831‧‧‧Identification data

P1‧‧‧First Path

P2‧‧‧Second Path

Other features and effects of the present invention will be clearly presented in the embodiment with reference to the drawings, in which: FIG. 1 is a schematic plan view illustrating a known optical fingerprint recognition device installed in a recognition area of a mobile device 2; FIG. 2 is an incomplete schematic side sectional view illustrating a state of a packaging module, a light emitting module, a photoluminescent layer, and a sensing module according to an embodiment of the identification device of the present invention; And this embodiment is suitable for identifying a finger; FIG. 3 is a schematic diagram illustrating two quantum dots in the photoluminescent layer of this embodiment; FIG. 4 is a functional block of the sensing module of this embodiment FIG. 5 is a view similar to FIG. 2, illustrating another configuration of the photoluminescent layer and the sensing module of the embodiment; and FIG. 6 is an incomplete side cross-sectional schematic view illustrating This embodiment is suitable for recognizing a human face.

Claims (10)

An identification device is suitable for identifying an image of an object, and includes: a packaging module having a first surface suitable for the object to approach and transmit light; a light emitting module disposed in the packaging module, And can be used to emit an initial light; a photoluminescent layer is disposed in the packaging module and includes several quantum dots, which can be excited by the initial light and emit an infrared light excitation Light, the excitation light passes through the package module along a first path and irradiates the object, and forms a reflected light reflected back into the package module along a second path; and a sensing module Is disposed on the packaging module and is located on the second path, and the sensing module is used for receiving the reflected light and identifying an image of the object formed by the reflected light. The identification device according to claim 1, wherein the sensing module comprises an imaging unit for forming the image by the reflected light, a data storage unit storing a reference data, and a data storage unit for storing the image An identification unit that is converted into identification data and compared with the reference data. The identification device according to claim 2, wherein the imaging unit has a photosensitive element capable of imaging with infrared light. The identification device according to claim 1, wherein each of the quantum dots is a perovskite structure or a core-shell structure, the core-shell structure has a core portion located at the center, and a Shell section. The identification device according to claim 4, wherein the material of the inner core portion is lead sulfide, and the material of the outer shell portion is cadmium sulfide. The identification device according to claim 1, wherein the packaging module further has a second surface opposite to the first surface, and the light emitting module is adjacent to the second surface. The identification device according to claim 6, wherein the first path and the second path are parallel to each other and are both perpendicular to the first surface. The identification device according to claim 1, wherein the starting light is blue light. According to the identification device of claim 1, the object is a finger, wherein the packaging module includes a touch panel having the first surface, and the first surface is adapted to be pressed by the object. According to the identification device described in claim 2, the object is a human face, and the reference data stored in the data storage unit is obtained by converting an image of a human face.