Biometric identification device

Abstract

This disclosure provides a biometric identification device. The biometric identification device includes an acquisition device, a display, and a controller. The acquisition device is used to acquire an image of a user. The display is disposed and covers one side of the acquisition device and includes at least one display module and a light-absorbing module. The light-absorbing module is disposed between the at least one display module and the acquisition device. The controller is used to control the display to display image data and to identify the image to generate biometric information, and to determine whether the user is an authorized user based on the biometric information. Therefore, it is suitable for environments with high frequency of identity recognition or high reliability requirements.

Description

Biometric devices BIOMETRIC IDENTIFICATION DEVICE Technical field

[0001] The present disclosure relates to a recognition device, and in particular to a biometric device with a display. Prior technology

[0002] Biometric recognition has been widely used in financial and access control systems due to its high security and high anti-counterfeiting properties. However, existing biometric devices must install the sensing lens and light source module independently on the surface of the equipment in terms of hardware layout, which makes it difficult to achieve an integrated visual setup by reserving openings in the device shell.

[0003] In addition, from the environmental tolerance and safety point of view, in public fields, the exposed sensing lens and light source modules are not only prone to accumulation of dust and oil scale, affecting the accuracy of image retrieval, but also the risk of human destruction or scratching, which significantly increases the maintenance cost.

[0004] Furthermore, the exposed sensing lens and light source module are clearly visible, and users are psychologically resistant when performing recognition similar to the pressure of being monitored or photographed.

[0005] It follows that there is currently a lack of a biometric device on the market that can completely hide the sensing component under the display panel without affecting the appearance integration and recognition performance. Contents of the invention

[0006] The purpose of the present elucidation is to provide a biorecognition device that is suitable for fields with high frequency of use or high reliability requirements for identity recognition while maintaining appearance consistency while hiding the retrieval device hidden behind the display.

[0007] According to one embodiment of the structural pattern disclosed herein, a biometric identification device is provided, comprising an acquisition device, a display, and a controller. The acquisition device is used to acquire an image of a user. The display is disposed and covers one side of the acquisition device and includes at least one display module and a light-absorbing module. The light-absorbing module is disposed between the at least one display module and the acquisition device. The controller is signal-connected to the display and the acquisition device, and is used to control the display to display image data, and to identify the image to generate biometric information, and to determine whether the user is an authorized user based on the biometric information. The image data includes an identification guidance prompt and an identity verification result.

[0008] Other embodiments of the foregoing implementation are as follows: The capturing device includes an infrared light source module and a camera module. The infrared light source module is used to illuminate a target object of the user. The camera module is used to capture an image of the target object.

[0009] Other embodiments of the foregoing implementation are as follows: The controller includes a trigger control unit. The trigger control unit is used to monitor the image and generate a light source turn-on signal and a start signal based on a triggering condition.

[0010] Other embodiments of the aforementioned implementation are as follows: the identification trigger condition includes determining whether a target distance of the target object is lower than a preset distance threshold, and the trigger control unit estimates the target distance of the target object through feature analysis.

[0011] Other embodiments of the aforementioned implementation are as follows: the target object is a user's palm or a user's face.

[0012] Other embodiments of the aforementioned implementation are as follows: The controller further includes a preprocessing unit, an identification unit, and a comparison unit. The preprocessing unit is signal-connected to the trigger control unit and is used to preprocess the image to remove noise. The identification unit is signal-connected to the preprocessing unit and is used to perform feature analysis on the image to generate biometric information. The comparison unit is signal-connected to the identification unit and is used to compare the biometric information with a pre-stored verification feature to generate a comparison score.

[0013] Other embodiments of the aforementioned implementation are as follows: when the comparison score is greater than a threshold value, the comparison unit determines that the user is an authorized user.

[0014] Other embodiments of the aforementioned implementation are as follows: the infrared light source module receives and turns on according to the light source turn-on signal, and the preprocessing unit receives and performs preprocessing on the image according to the identification start signal, so that the identification unit can perform feature analysis on the image.

[0015] Other embodiments of the foregoing implementation are as follows: At least one display module includes a liquid crystal layer, two transparent conductive layers, and two protective layers. The two transparent conductive layers are respectively disposed on two sides of the liquid crystal layer. The two protective layers are respectively disposed on the two sides of the two transparent conductive layers away from the liquid crystal layer.

[0016] Other embodiments of the aforementioned implementation are as follows: a light absorption module is used to absorb visible light that penetrates at least one display module.

[0017] Other embodiments of the aforementioned implementation are as follows: at least one display module has a transmittance of more than 15% in the infrared wavelength range.

[0018] Other embodiments of the aforementioned implementation are as follows: At least three display modules are used, each of the three display modules includes a liquid crystal layer, and the liquid crystal layers of the three display modules respectively correspond to a plurality of first pixels, a plurality of second pixels, and a plurality of third pixels. The three display modules are stacked and each displays a different color.

[0019] Other embodiments of the foregoing implementation are as follows: At least one display module is provided, and each display module includes a liquid crystal layer. The liquid crystal layer includes a plurality of first pixels, a plurality of second pixels, and a plurality of third pixels. The first pixels are spaced apart from each other. The second pixels are spaced apart from each other. The third pixels are spaced apart from each other. The first, second, and third pixels are arranged in parallel sequence and each displays a different color. Simple Explanation of the Diagram

[0020] Figure 1 is a schematic diagram illustrating a biometric identification device according to a first embodiment of the present disclosure; Figure 2 is a schematic diagram illustrating a usage scenario of the biometric identification device based on Figure 1; Figure 3 illustrates a block connection diagram of the biometric identification device according to the first embodiment of this disclosure; Figure 4A illustrates a schematic diagram of a display according to the first embodiment of the present disclosure; and Figure 4B is a schematic diagram of a display of the second embodiment of the present disclosure. Implementation

[0021] Several embodiments of this disclosure will now be described with reference to the accompanying drawings. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit the scope of this disclosure. That is, in some embodiments of this disclosure, these practical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and elements will be shown in the drawings in a simple schematic manner; and repeated elements may be represented by the same number.

[0022] Furthermore, in this document, when a component (or unit or module, etc.) is "connected" to another component, it can mean that the component is directly connected to the other component, or that the component is indirectly connected to the other component, meaning that there is another component between the component and the other component. Only when it is explicitly stated that a component is "directly connected" to another component does it indicate that there is no other component between the component and the other component. The terms "first," "second," and "third" are only used to describe different components and do not limit the components themselves; therefore, "first component" can also be referred to as "second component." Moreover, the combinations of components / units / circuits in this document are not combinations generally known, conventional, or customary in this field. Whether the components / units / circuits themselves are customary cannot be used to determine whether their combination relationships are easily accomplished by someone with ordinary knowledge in the art.

[0023] Please refer to Figures 1, 2, and 3, where Figure 1 is a schematic diagram illustrating a biometric identification device according to a first embodiment of the present disclosure; Figure 2 is a schematic diagram illustrating a usage scenario of the biometric identification device according to Figure 1; and Figure 3 is a block connection schematic diagram illustrating the biometric identification device according to the first embodiment of the present disclosure. The biometric identification device 100 includes a display 110, a capturing device 120, and a controller 130. The display 110 is disposed on and covers one side of the capturing device 120, and the controller 130 is signal-connected to the display 110 and the capturing device 120. As shown in Figure 2, the biometric identification device 100 can be applied to access control management.

[0024] In the first embodiment, the display 110 may be a cholesterol liquid crystal display (ChLCD); the capturing device 120 may be an infrared palm print recognition device or a TrueDepth camera system; the controller 130 may be a microprocessor, a central processing unit (CPU), a mobile device processor, a cloud processor, or other electronic computing processor, but the present disclosure is not limited thereto.

[0025] The display 110 is used to display image data, and the capturing device 120 is used to provide a light source to illuminate a user and capture an image of a target object of the user. The controller 130 is used to control the display 110 to display image data, and to identify the user's image to generate biometric information, and to determine whether the user is an authorized user based on the biometric information.

[0026] Specifically, the target object for the user is either the user's palm or the user's face. The image data includes an identification guide and an identity verification result. The display 110 guides the user to perform biometric identification by presenting the target object to the capturing device 120 using the identification guide in the image data (e.g., prompting the user to extend their palm or remove their mask to provide their face for identification, as shown in Figure 2). After the controller 130 completes the identification based on the target object, the user can view the identification result through the identity verification result in the image data on the display 110.

[0027] In this way, the display 110 can simultaneously provide identification guidance prompts and identity verification results, which can enhance the user's operational intuition and achieve a high degree of integration between information display and biometric identification.

[0028] Please refer to Figures 1 and 3. The capturing device 120 includes an infrared light source module 121 and a camera module 122. The infrared light source module 121 is used to illuminate the target object of the user. The camera module 122 is used to capture images of the target object. In the first embodiment, the infrared light source module 121 may be a floodlight infrared light source or a dot projector; the camera module 122 may be an infrared camera, but this disclosure is not limited thereto.

[0029] To further explain, when the target object to be captured by the capturing device 120 is the user's palm, the infrared light source module 121 can use a floodlight infrared light source. Human veins have light-absorbing properties; deoxyhemoglobin in hemoglobin strongly absorbs infrared light, causing the veins to appear as black shadows, forming a vein pattern for the imaging module 122 to capture, and for the controller 130 to use for subsequent identity recognition. When the target object to be captured by the capturing device 120 is the user's face, the infrared light source module 121 can use a dot projector. By projecting tens of thousands of infrared dots onto the face, the dot projector allows the imaging module 122 to capture the displacement and deformation of these infrared dots on the face, for the controller 130 to use for subsequent identity recognition.

[0030] Please refer to Figures 1 and 4A, where Figure 4A is a schematic diagram illustrating a display according to a first embodiment of the present disclosure. The display 110 includes at least one display module 111 and a light-absorbing module 112, the light-absorbing module 112 being disposed between the at least one display module 111 and the capturing device 120. Furthermore, when the number of at least one display module 111 is plurality of, the display 110 further includes at least one optical adhesive layer 113, the at least one optical adhesive layer 113 being disposed between the display modules 111 for bonding the display modules 111 together.

[0031] Visible light L can pass through at least one display module 111 and light absorption module 112 to reach the capturing device 120. In other words, the capturing device 120 can pass through the display module 111 to capture the user's image. In addition, the transmittance of at least one display module 111 in the infrared wavelength range can be greater than 15%, but this disclosure is not limited thereto.

[0032] In the first embodiment shown in Figure 4A, there are at least three display modules 111 and at least two optical adhesive layers 113. Visible light L can sequentially pass through the stacked display modules 111 and light absorption modules 112 to reach the capturing device 120. Each display module 111 includes a liquid crystal layer 1111, two transparent conductive layers 1112, and two protective layers 1113. The two transparent conductive layers 1112 are respectively disposed on two sides of the liquid crystal layer 1111, and the two protective layers 1113 are respectively disposed on the two sides of the two transparent conductive layers 1112 away from the liquid crystal layer 1111. In the first embodiment, the transparent conductive layer 1112 may be made of transparent conductive materials such as indium-tin-oxide (ITO) or indium-zinc-oxide (IZO); the protective layer 1113 may be made of flexible transparent organic materials such as glass, PET or polyimide (PI), but the present disclosure is not limited thereto.

[0033] In the first embodiment shown in Figure 4A, the three display modules 111 are stacked and each displays a different color. Specifically, the liquid crystal layers 1111 of the three display modules 111 correspond to a plurality of first pixels R, a plurality of second pixels G, and a plurality of third pixels B from bottom to top. The display module 111 at the bottom reflects red light, the display module 111 in the middle reflects green light, and the display module 111 at the top reflects blue light.

[0034] The light-absorbing module 112 has a light-absorbing layer for absorbing visible light L that penetrates the display modules 111 and providing infrared light transmission. The light-absorbing layer can be made of an infrared-transmitting material, either dye-based or coated, so that the lens of the camera module 122 can be directly positioned behind the light-absorbing module 112 for image capture. The infrared-transmitting material can be an organic dye such as bromine-substituted dye or nitrososubstituted dye, a black organic dye based on aniline or phenothiazine, or a polymer dye such as polyvinyl chloride dye. The light-absorbing layer can have its infrared transmission efficiency increased by adjusting the proportions of different materials during processing, while maintaining the inherent properties of the plastic.

[0035] Therefore, through the light absorption module 112's good penetration characteristics for near-infrared light, the imaging module 122 of the capturing device 120 can clearly capture the image of the user's palm vein distribution or the infrared point features of the face, ensuring the accuracy and stability of the subsequent body recognition by the controller 130.

[0036] It should be noted that, in other possible embodiments, the light absorption module may further include a substrate, which may be disposed on one side of the light absorption layer and bonded to the lens. In this case, the light absorption layer can be made of a dye-based infrared-transmitting material, and can be formed by mixing the dye-based infrared-transmitting material with an optical adhesive and then applying it to the substrate. Furthermore, in other possible embodiments, the light absorption module may also include an adhesive layer, which is disposed on one side of the light absorption layer and bonded to the protective layer. The light absorption layer can be formed by mixing a dye-based infrared-transmitting material with a substrate such as plastic or ABS (Acrylonitrile Butadiene Styrene) resin.

[0037] To further explain, when the display 110 uses a cholesteric liquid crystal display (LCD), the driving substrate of the cholesteric LCD contains only transparent materials such as ITO or PI in the active area (AA). Therefore, it is nearly transparent in both the visible light (L) and infrared (IR) bands, and does not contain opaque components such as color filters (CF), thin-film transistors (TFTs), and polarizers found in liquid crystal displays (LCDs) or organic light-emitting diodes (OLEDs). It is estimated that it can achieve a transmittance of 60% in the 700 nm to 1000 nm band. In addition, the cholesteric LCD has a higher transmittance in the IR band compared to other displays, allowing the capturing device 120 to capture the image of the driver or passenger through the display 110 without affecting the normal display function of the display 110.

[0038] Therefore, by utilizing the characteristics of cholesteric liquid crystal used in the display 110, the capturing device 120 can be hidden behind the display 110. While maintaining a consistent appearance and reducing the monitoring burden by noticing the lens, it can achieve non-contact image capture and effectively protect the capturing device 120 from contamination or damage caused by dust, liquid or human contact, thereby improving the durability and reliability of the device. It is suitable for fields with high frequency of use or high reliability requirements for identity recognition.

[0039] Please refer to Figures 1 and 4B, where Figure 4B is a schematic diagram illustrating a display according to a second embodiment of the present disclosure. In the second embodiment shown in Figure 4B, the display 110 has at least one display module 111 (i.e., the display 110 has a single-layer horizontal structure). The display module 111 includes a liquid crystal layer 1111, two transparent conductive layers 1112, and two protective layers 1113.

[0040] The liquid crystal layer 1111 includes a plurality of first pixels R, a plurality of second pixels G, and a plurality of third pixels B. The first pixels R are spaced apart from each other, the second pixels G are spaced apart from each other, and the third pixels B are spaced apart from each other. The first pixels R, second pixels G, and third pixels B are arranged in parallel in sequence and each displays a different color. Specifically, the first pixels R, second pixels G, and third pixels B can reflect red, green, and blue light respectively. Furthermore, the transparent conductive layer 1112 and the protective layer 1113 of the display module 111 in the second embodiment have the same structure as their counterparts in the first embodiment, and will not be described again here.

[0041] Please refer to Figure 3. The controller 130 includes a trigger control unit 131, a preprocessing unit 132, an identification unit 133, a comparison unit 134, and a display control unit 135, all connected by signals. The trigger control unit 131 monitors the image and generates a light source activation signal and an identification start signal based on an identification trigger condition. The identification trigger condition includes determining whether the target distance of the target object is lower than a preset distance threshold. When the target distance is lower than the preset distance threshold, the trigger control unit 131 generates and transmits a light source activation signal to the infrared light source module 121. The infrared light source module 121 receives the light source activation signal and activates accordingly.

[0042] In detail, the trigger control unit 131 estimates the target distance of the target object through feature analysis. When the target distance is lower than a preset distance threshold, it indicates that the target object has entered the region of interest (ROI) of the imaging module 122. At this time, the trigger control unit 131 controls the infrared light source module 121 to turn on and begin biometric identification. Further, the biometric identification device 100 normally functions only as a display 110. Only when the capturing device 120 detects a target object (palm or face) approaching will it actively turn on the infrared light source module 121 and capture an image of the target object illuminated by the infrared light source module 121 for biometric identification. This effectively reduces power consumption and accidental touches.

[0043] The preprocessing unit 132 is used to preprocess the image of the target object illuminated by the infrared light source module 121 to remove noise and enhance the biometric features in the image. The identification unit 133 is used to perform feature analysis on the preprocessed image to generate biometric identification information. In addition, the preprocessing unit 132 receives an identification start signal from the trigger control unit 131 and performs preprocessing on the image according to the identification start signal so that the identification unit 133 can perform feature analysis on the image.

[0044] The comparison unit 134 compares the biometric information with a pre-stored verification feature to generate a comparison score. When the comparison score is greater than a threshold value, the comparison unit 134 determines that the user is an authorized user.

[0045] It should be noted that the biometric identification device 100 can be applied to various fields where identity authentication is required, such as vehicle identity verification, high-level management access control, confidential equipment access control, or medical care. It can also be installed on different electronic devices or combined with different display technologies and identification processes according to actual needs. Further examples are given below.

[0046] When applied to vehicle identification, the biometric device 100 can be installed on the B-pillar, armrest, or next to the steering wheel of the car, using biometrics as a key replacement to enable vehicle start, personalization settings, and fleet identification. Furthermore, the concealed design of the capture device 120 eliminates in-car camera anxiety, and the low-power cholesteric liquid crystal display of the display 110 is suitable for in-vehicle environments where stable information display over long periods is required and power supply is limited.

[0047] When applied to high-level management access control and confidential equipment access control areas (such as cleanrooms in semiconductor factories, laboratories, military units and other confidential places), the biometric identification device 100 can be installed at the entrance and exit of the place, and the hidden setting of the acquisition device 120 meets the security requirements of not exposing the lens.

[0048] When applied in healthcare settings (wards, nursing stations, and medication management cabinets), the biometric device 100 can help quickly verify the user's identity, facilitating access for management personnel. Furthermore, palmprint or facial recognition methods are more suitable for individuals with unstable fingerprints, providing a contactless and hygienic identification method and simplifying operational procedures.

[0049] As can be seen from the above embodiments, the present disclosure has the following advantages: First, because the display uses a cholesteric liquid crystal display that allows infrared light to penetrate, the capturing device behind it can capture images outwards. While maintaining a consistent appearance and reducing monitoring pressure by noticing the lens, it effectively protects the capturing device from contamination or damage caused by dust, liquids, or human contact, thereby improving the durability and reliability of the device. This makes it suitable for fields with high frequency of use or high reliability requirements for identity recognition. Second, by triggering the infrared light source module to turn on and triggering the preprocessing unit to preprocess the image according to the recognition trigger conditions by the trigger control unit, power consumption can be effectively reduced and accidental touches can be minimized. Third, by simultaneously providing recognition guidance prompts and identity verification results through the display, the user's operational intuition can be improved, achieving a high degree of integration between information display and biometric identification.

[0050] Although the present disclosure has been presented above with reference to embodiments, it is not intended to limit the scope of the present disclosure. Anyone skilled in the art may make some modifications and refinements without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure shall be determined by the appended claims.

[0051] 100: Biometric identification device 110: Monitor 111: Display Module 1111: Liquid Crystal Layer 1112: Transparent conductive layer 1113: Protective layer 112: Light Absorption Module 113: Optical adhesive layer 120: Acquisition device 121: Infrared light source module 122: Camera Module 130: Controller 131: Trigger control unit 132: Preprocessing Unit 133: Identification Unit 134: Comparison Unit 135: Display control unit B: The third pixel G: second pixel L: Visible light R: first pixel

Claims

1. A biometric identification device, comprising: a capturing device for capturing an image of a user; a display screen disposed on and covering one side of the capturing device, and comprising: at least one display module; and a light-absorbing module disposed between the at least one display module and the capturing device; and a controller, signal-connected to the display screen and the capturing device, for controlling the display screen to display image data, and for recognizing the image to generate biometric information, and for determining whether the user is an authorized user based on the biometric information; wherein... The image data includes an identification guide and an identity verification result.

2. The biometric device as claimed in claim 1, wherein the capturing device comprises: an infrared light source module for illuminating a target object of the user; and a camera module for capturing an image of the target object.

3. The biometric device as claimed in claim 2, wherein the controller comprises: a trigger control unit for monitoring the image and generating a light source turn-on signal and an identification start signal according to an identification trigger condition.

4. The biometric identification device as described in claim 3, wherein the identification triggering condition includes determining whether a target distance of the target object is lower than a preset distance threshold, and the triggering control unit estimates the target distance of the target object through feature analysis.

5. The biometric device as described in claim 3, wherein the target object is a hand of the user or a face of the user.

6. The biometric device as claimed in claim 3, wherein the controller further comprises: a preprocessing unit, signal-connected to the trigger control unit, for preprocessing the image to remove noise; an identification unit, signal-connected to the preprocessing unit, for performing feature analysis on the image to generate the biometric information; and a comparison unit, signal-connected to the identification unit, for comparing the biometric information with a pre-stored verification feature to generate a comparison score.

7. The biometric identification device as described in claim 6, wherein, When the comparison score is greater than a threshold value, the comparison unit determines that the user is an authorized user.

8. The biometric identification device as claimed in claim 6, wherein the infrared light source module receives and is turned on according to the light source turn-on signal, and the preprocessing unit receives and performs preprocessing on the image according to the identification start signal, so that the identification unit can perform feature analysis on the image.

9. The biometric identification device as claimed in claim 1, wherein the at least one display module comprises: a liquid crystal layer; two transparent conductive layers disposed on two sides of the liquid crystal layer; and two protective layers disposed on two sides of the two transparent conductive layers away from the liquid crystal layer.

10. The biometric device as claimed in claim 1, wherein the light absorption module is used to absorb visible light that penetrates the at least one display module.

11. The biometric device as claimed in claim 1, wherein the at least one display module has a transmittance of more than 15% in the infrared wavelength range.

12. The biometric identification device as claimed in claim 1, wherein the number of the at least one display module is three, each of the three display modules includes a liquid crystal layer, and the liquid crystal layer of the three display modules respectively corresponds to a plurality of first pixels, a plurality of second pixels, and a plurality of third pixels; wherein, The three display modules are stacked and each displays a different color.

13. The biometric identification device as claimed in claim 1, wherein the number of the at least one display module is one, the display module comprising a liquid crystal layer, the liquid crystal layer comprising: a plurality of first pixels spaced apart from each other; a plurality of second pixels spaced apart from each other; and a plurality of third pixels spaced apart from each other; wherein, The first, second, and third pixels are arranged in parallel sequence and each displays a different color.

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