Fingerprint recognition structure, display module and display device

Abstract

The present disclosure provides a fingerprint recognition structure, a display module and a display device, which belong to the field of display technology, and can solve the problem that the existing fingerprint system cannot resist the attack of fake fingerprints made by printing, and there is a security risk. The fingerprint recognition structure disclosed in the present disclosure includes: a plurality of fingerprint recognition units arranged in an array; each fingerprint recognition unit includes: a plurality of optical sensors and a color filter layer located on the side of the light incident surface close to the optical sensor; the color filter layer has a plurality of sub-recognition areas of different colors; wherein each sub-recognition area is provided with a color filter of a corresponding color, which is used to filter the light reflected by the fingerprint into light corresponding to the color of the sub-recognition area and carrying color information; the optical sensor is used to collect the light signal of the light carrying the color information, and output the collected light signal for the processor to identify the fingerprint as a real fingerprint or a fake fingerprint.

Description

Technical Field

[0001] The present disclosure belongs to the field of display technology, and specifically relates to a fingerprint recognition structure, a display module and a display device. Background Art

[0002] With the widespread popularization of optical fingerprint recognition technology in mobile smart terminal devices, optical fingerprint recognition technology is being more and more widely used in fingerprint unlocking, mobile payment, software encryption and other scenarios of terminal devices such as mobile phones. People have also put forward higher requirements on the security of fingerprint recognition systems in terminal devices.

[0003] At present, fake fingerprints made by printing the residual fingerprints on the surface of objects or fingerprint images can be used to deceive fingerprint recognition systems, thus bringing potential risks. Therefore, identifying and resisting fake fingerprint attacks is of great significance to the security of fingerprint recognition systems. Summary of the invention

[0004] The present disclosure aims to solve at least one of the technical problems existing in the prior art and provide a fingerprint recognition structure, a display module and a display device.

[0005] In a first aspect, an embodiment of the present disclosure provides a fingerprint recognition structure, comprising: a plurality of fingerprint recognition units arranged in an array; each of the fingerprint recognition units comprises: a plurality of optical sensors and a color filter layer located on a side of a light incident surface close to the optical sensor;

[0006] The color filter layer has a plurality of sub-identification areas of different colors; wherein each of the sub-identification areas is provided with a color filter of a corresponding color, for filtering the light reflected by the fingerprint into light corresponding to the color of the sub-identification area and carrying color information;

[0007] The optical sensor is used to collect light signals of light carrying color information, and output the collected light signals for the processor to identify whether the fingerprint is a real fingerprint or a fake fingerprint.

[0008] Optionally, the sub-recognition areas include at least any two of a red sub-recognition area, a green sub-recognition area and a blue sub-recognition area.

[0009] Optionally, the color filter layer further has a hollow area;

[0010] The optical sensor is also used to collect color information of the light transmitted by the hollow area.

[0011] Optionally, the area of ​​the hollow region is greater than or equal to the area of ​​each of the sub-identification regions.

[0012] Optionally, a filling layer is provided in the hollow area; the material of the filling layer includes: transparent material or white photoresist.

[0013] Optionally, the optical sensors all include: a photodiode.

[0014] In a second aspect, an embodiment of the present disclosure provides a display module, comprising the fingerprint recognition structure provided above.

[0015] Optionally, the display module further comprises: a display panel and a collimation structure;

[0016] The fingerprint recognition structure is located on a side of the display surface away from the display panel;

[0017] The alignment structure is located between the fingerprint recognition structure and the display panel.

[0018] Optionally, the display module further includes: a backlight structure;

[0019] The fingerprint identification structure is located on a side close to the light emitting surface of the backlight structure.

[0020] In a third aspect, an embodiment of the present disclosure provides a display device, comprising the display module provided as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of an exemplary display module structure;

[0022] Figure 2 A schematic diagram of a fingerprint recognition structure provided by an embodiment of the present disclosure;

[0023] Figure 3a A schematic diagram of the structure of a first color filter layer provided in an embodiment of the present disclosure;

[0024] Figure 3b A schematic diagram of the structure of a second color filter layer provided in an embodiment of the present disclosure;

[0025] Figure 3c A schematic diagram of the structure of a third color filter layer provided in an embodiment of the present disclosure;

[0026] Figure 3d A schematic diagram of the structure of a fourth color filter layer provided in an embodiment of the present disclosure;

[0027] Figure 3e A schematic diagram of the structure of a fifth color filter layer provided in an embodiment of the present disclosure;

[0028] Figure 3f A schematic diagram of the structure of a fifth color filter layer provided in an embodiment of the present disclosure;

[0029] Figure 4 A schematic diagram of the structure of a display module provided by an embodiment of the present disclosure;

[0030] Figure 5 A schematic diagram of the structure of another display module provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] Figure 1 is a schematic diagram of an exemplary display module structure, such as Figure 1As shown, the display module includes: a display panel 101, a collimating structure 102 and a fingerprint recognition structure 103, wherein the fingerprint recognition structure 103 is located on the display surface side away from the display panel 101, and the collimating structure 102 is located between the fingerprint recognition structure 103 and the display panel 101. The display panel 101 may be a self-luminous organic light-emitting diode (OLED) display panel. When a finger is pressed on the display panel 101, the light emitted by the display panel 101 is irradiated to the surface of the finger, and the finger fingerprint can reflect the light emitted by the display panel 101, and after passing through the collimating structure 102, it is irradiated to the fingerprint recognition structure 103. Since the valleys and ridges in the fingerprint of the finger have different reflective abilities for light, an identification image of the finger fingerprint can be formed, and the identification image of the finger fingerprint is compared with the image pre-stored in the image library. If the identification image of the finger fingerprint is the same as the image pre-stored in the image library, it means that the finger fingerprint is a verification fingerprint for fingerprint unlocking, mobile payment, and software encryption. If the identification image of the finger fingerprint is different from the image pre-stored in the image library, it means that the finger fingerprint verification has failed. At present, the residual imprint of the finger fingerprint on the surface of the object or the fingerprint picture, etc., and the fake fingerprint produced by printing can also form an identification image identical to the verification fingerprint to deceive the fingerprint recognition system. The current fingerprint recognition system is still unable to recognize the fake fingerprint produced by printing, and there is a great potential risk. In order to solve at least one of the above-mentioned technical problems, the present disclosure provides a fingerprint recognition structure, a display module and a display device. The fingerprint recognition structure, display module and display device provided by the present disclosure will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] Embodiment 1

[0035] Figure 2 A schematic diagram of a fingerprint recognition structure provided by an embodiment of the present disclosure is shown in FIG. Figure 2 As shown, the fingerprint recognition structure includes: a plurality of fingerprint recognition units arranged in an array; each fingerprint recognition unit includes: a plurality of optical sensors 201 and a color filter layer 202 located on a light incident side close to the optical sensor 201; the color filter layer 202 has a plurality of sub-recognition areas of different colors; wherein each sub-recognition area is provided with a color filter of a corresponding color, which is used to filter the light reflected by the fingerprint into light corresponding to the color of the sub-recognition area and carrying color information; the optical sensor 201 is used to collect light signals of the light carrying color information, and output the collected light signals for the processor to identify the fingerprint as a true fingerprint or a false fingerprint.

[0036] It should be noted that after a large number of experiments, it has been proved that the reflection ability of fingerprints for light of different wavelengths is different, and the reflection ability of different fingerprints for the same wavelength is constant. For example, under the illumination of standard D65 light source, the corresponding RGB color tristimulus values ​​of fingerprints are around (28, 25, 19). When different light sources are selected for illumination, the corresponding RGB tristimulus values ​​are different, but within a small fluctuation range. When different fingerprints are used for testing, the corresponding RGB color tristimulus values ​​are also constant, indicating that the reflection ability of human fingerprints for light of different wavelengths is almost constant, and light of different wavelengths irradiates the fingerprints and has the unique color information of the fingerprints after reflection.

[0037] In the fingerprint recognition structure provided by the embodiment of the present disclosure, the color filter layer 202 has multiple sub-recognition areas of different colors, and each sub-recognition area is provided with a color filter of a corresponding color, which can filter the light reflected by the finger fingerprint into a monochromatic light of a corresponding color. For example, the red filter can filter white light into red light, the green filter can filter white light into green light, and the blue filter can filter white light into blue light. The optical sensor 201 can receive the monochromatic light filtered by the color filter layer 202. Since the finger fingerprint has different reflective abilities for light of different wavelengths, and different finger fingerprints have certain reflective abilities for the same wavelength, the optical sensor 201 can collect different light signals carrying multiple color information, and output the collected light signals for the processor to form a recognition image of the finger fingerprint carrying multiple color information. For a fake fingerprint made by printing, the optical sensor 201 can only collect the black color information in the print pattern of the fake fingerprint, forming an identification image that only carries one color information, which is different from the identification image formed by the real finger fingerprint. Therefore, it can realize the function of identifying the finger fingerprint as a real fingerprint or a fake fingerprint, so that the fingerprint recognition system can have the function of resisting fake fingerprint attacks, thereby improving the security level of the fingerprint recognition system.

[0038] In some embodiments, the sub-recognition areas include at least any two of the red sub-recognition area R, the green sub-recognition area G and the blue sub-recognition area B.

[0039] It should be noted that Figure 3a A schematic diagram of the structure of the first color filter layer provided in the embodiment of the present disclosure is shown in FIG. Figure 3aAs shown, the color filter layer 202 has a red sub-identification area R and a green sub-identification area G, wherein the red sub-identification area R is provided with a red filter, which can filter the light reflected by the fingerprint into red light, which carries red color information, and the green sub-identification area G is provided with a green filter, which can filter the light reflected by the fingerprint into green light, which carries green color information. In this way, the optical sensor 201 can collect light signals carrying red color information and green color information, so that the processor can form an identification image of the finger fingerprint carrying red color information and green color information. For a fake fingerprint made by printing, the optical sensor 201 can only collect the black color information in the print pattern of the fake fingerprint, forming an identification image that only carries one color information, which is different from the identification image formed by the real finger fingerprint. Therefore, the function of identifying the finger fingerprint as a real fingerprint or a fake fingerprint can be realized, so that the fingerprint recognition system can have the function of resisting fake fingerprint attacks, thereby improving the security level of the fingerprint recognition system. It can be understood that Figure 3a The relative positions of the red sub-recognition area R and the green sub-recognition area G in the optical sensor 201 can also be interchanged without affecting the functions of the corresponding optical sensors 201. The implementation principle is the same as Figure 3a The implementation principle of the color filter layer shown is the same and will not be repeated here. Figure 3b A schematic diagram of the structure of a second color filter layer provided in an embodiment of the present disclosure is shown in FIG. Figure 3b As shown, the color filter layer 202 has a red sub-identification area R and a blue sub-identification area B, wherein the red sub-identification area R is provided with a red filter, which can filter the light reflected by the fingerprint into red light, which carries red color information, and the blue sub-identification area B is provided with a blue filter, which can filter the light reflected by the fingerprint into blue light, which carries blue color information, so that the optical sensor 201 can collect the light signal carrying red color information and blue color information, so that the processor can form the identification image of the finger fingerprint carrying red color information and blue color information. Since the identification image formed by the fake fingerprint produced by printing is different from the real finger fingerprint, the function of identifying the finger fingerprint as a real fingerprint or a fake fingerprint can be realized, so that the fingerprint recognition system can have the function of resisting fake fingerprint attacks, thereby improving the security level of the fingerprint recognition system. Figure 3c A schematic diagram of the structure of a third color filter layer provided in an embodiment of the present disclosure is shown in FIG. Figure 3c As shown, the color filter layer 202 has a green sub-identification area G and a blue sub-identification area B, wherein the green sub-identification area G is provided with a green filter, which carries green color information, and the blue sub-identification area B is provided with a blue filter, which carries blue color information. The implementation principle is the same as Figure 3a and Figure 3b The implementation principle of the color filter shown is similar and will not be repeated here. Figure 3dA schematic diagram of the structure of a fourth color filter layer provided in an embodiment of the present disclosure is shown in FIG. Figure 3d As shown, the color filter layer 202 has a red sub-recognition area R, a green sub-recognition area G and a blue sub-recognition area B, wherein the red sub-recognition area R is provided with a red filter, the green sub-recognition area G is provided with a green filter, and the blue sub-recognition area B is provided with a blue filter. The implementation principle is the same as Figure 3a and Figure 3b The implementation principle of the color filter shown is similar, and will not be repeated here. Unlike the above-mentioned color filter layer 202 having only two-color sub-recognition areas, the color filter 202 having three-color sub-recognition areas can collect color information of three different wavelengths of monochromatic light, thereby improving the accuracy of the fingerprint recognition image, and further improving the security performance. It can be understood that the area size of each sub-recognition area in the color filter layer 202 can be equal or unequal. For example, the color filter layer 202 is provided with a red sub-recognition area R, a green sub-recognition area G and a blue sub-recognition area B, wherein the area of ​​the red sub-recognition area R is larger than the area of ​​the green sub-recognition area G and the blue sub-recognition area B, or the area of ​​the green sub-recognition area G is larger than the area of ​​the red sub-recognition area R and the blue sub-recognition area B. The implementation principle is the same, and will not be repeated here.

[0040] In some embodiments, the color filter layer 202 further has a hollow area; the optical sensor 201 is further used to collect color information of light transmitted through the hollow area.

[0041] It should be noted that, since the real finger fingerprint has a weak reflection ability for blue light, the hollow area can be used to increase the light transmittance to prevent the light from being blocked by color filters of different colors and affecting the function of the optical sensor, thereby improving the accuracy of the fingerprint recognition structure. Since the hollow area has a certain relationship with the light transmittance of the red sub-recognition area R, the green sub-recognition area G, and the blue sub-recognition area B, specifically, the light transmittance of the hollow area can be the sum of the light transmittances of the red sub-recognition area R, the green sub-recognition area G, and the blue sub-recognition area B, the color information carried by the light passing through the hollow area and the color information carried by the light passing through the red sub-recognition area R and the green sub-recognition area G can be used to calculate the color information carried by the light passing through the blue sub-recognition area B, thereby avoiding the problem of inaccurate color information in the light signal collected by the optical sensor 201 due to the weak reflection ability of the finger fingerprint for blue light.

[0042] In some embodiments, the area of ​​the hollow region is greater than or equal to the area of ​​each sub-identification region.

[0043] It needs to be explained that, Figure 3e A schematic diagram of the structure of a fifth color filter layer provided in an embodiment of the present disclosure is shown in FIG. Figure 3eAs shown, the area of ​​the hollow region of the color filter layer 202 is larger than the area of ​​each sub-recognition region, which can increase the transmittance of light and avoid the color filters of different colors blocking the light and affecting the recognition accuracy. Figure 3f A schematic diagram of the structure of a sixth color filter layer provided in an embodiment of the present disclosure is shown in FIG. Figure 3f As shown, the area of ​​the hollow region of the color filter layer 202 is equal to the area of ​​each sub-recognition region. It is understandable that the area of ​​each sub-recognition region and the hollow region of the color filter layer 202 can be set according to actual needs to improve the fingerprint recognition accuracy.

[0044] In some embodiments, a filling layer is disposed in the hollow area; the material of the filling layer includes: a transparent material or a white photoresist.

[0045] It should be noted that the hollow area may be provided with a filling layer, and the filling layer may flatten the hollow area to prevent the structure of the hollow area from affecting the lamination of the color filter layer 202 with other film layers. Specifically, the material of the filling layer may be a transparent material or a white photoresist, and the thickness of the transparent material or the thickness of the white photoresist may be the same as that of other sub-identification areas of the color filter layer 202.

[0046] In some embodiments, the optical sensors 201 each include: a photodiode.

[0047] It should be noted that, in practical applications, the optical sensor 201 may use a photodiode, specifically a PN junction or a PIN junction, which may convert the light signal reflected by the fingerprint into an electrical signal to collect the color information of the fingerprint and realize the fingerprint recognition function.

[0048] Embodiment 2

[0049] Figure 4 A schematic diagram of a display module provided in an embodiment of the present disclosure is shown in FIG. Figure 4 As shown, the display module includes a fingerprint recognition structure 103 as provided in any of the above embodiments; the display module also includes: a display panel 101 and a collimation structure 102; the fingerprint recognition structure 103 is located on the side of the display surface away from the display panel 101, and the collimation structure 102 is located between the fingerprint recognition structure 103 and the display panel 101.

[0050] The display panel of the display module 101 provided in the embodiment of the present disclosure may be a self-luminous OLED display panel. In the fingerprint recognition structure of the display module, the color filter layer 202 has a plurality of sub-recognition areas of different colors, and each sub-recognition area is provided with a color filter of a corresponding color, which can filter the light reflected by the fingerprint into a monochromatic light of a corresponding color. For example, a red filter can filter white light into red light, a green filter can filter white light into green light, and a blue filter can filter white light into blue light. The optical sensor 201 can receive the monochromatic light filtered by the color filter layer 202. Since the reflection ability of the fingerprint of the finger is different for light of different wavelengths, and the reflection ability of different fingerprints for the same wavelength is certain, the optical sensor 201 can collect different light signals carrying information of multiple colors, and output the collected light signals for the processor to form a recognition image of the fingerprint of the finger carrying information of multiple colors. For a fake fingerprint made by printing, the optical sensor 201 can only collect the black color information in the print pattern of the fake fingerprint, forming an identification image that only carries one color information, which is different from the identification image formed by the real finger fingerprint. Therefore, it can realize the function of identifying the finger fingerprint as a real fingerprint or a fake fingerprint, so that the fingerprint recognition system can have the function of resisting fake fingerprint attacks, thereby improving the security level of the fingerprint recognition system.

[0051] Figure 5 A schematic diagram of the structure of another display module provided in an embodiment of the present disclosure is shown in FIG. Figure 5 As shown, the display module includes a fingerprint recognition structure 103 as provided in any of the above embodiments; the display module also includes: a backlight structure 104; the fingerprint recognition structure 103 is located on a side close to the light emitting surface of the backlight structure 104.

[0052] It should be noted that the backlight structure 104 in the display module provided in the embodiment of the present disclosure can provide a light source for a liquid crystal display panel, etc. The implementation principle of the display module provided in the embodiment of the present disclosure is similar to the implementation principle of the above-mentioned display module, which will not be repeated here.

[0053] Embodiment 3

[0054] An embodiment of the present disclosure provides a display device, which includes a display module as provided in any of the above embodiments. The display device can be a terminal device such as a mobile phone, a tablet computer, a smart watch, a laptop computer, etc. Its implementation principle is similar to the implementation principle of the display module provided in any of the above embodiments, and will not be repeated here.

[0055] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A fingerprint recognition structure, It is characterized in that include: A plurality of fingerprint recognition units arranged in an array; Each of the fingerprint recognition units comprises: a plurality of optical sensors and a color filter layer located on a side close to a light incident surface of the optical sensor; The color filter layer has a plurality of sub-identification areas of different colors; wherein each of the sub-identification areas is provided with a color filter of a corresponding color, for filtering the light reflected by the fingerprint into light corresponding to the color of the sub-identification area and carrying color information; The optical sensor is used to collect light signals of light carrying color information, and output the collected light signals for the processor to identify the fingerprint as a real fingerprint or a fake fingerprint; The sub-recognition areas include at least any two of a red sub-recognition area, a green sub-recognition area and a blue sub-recognition area; The color filter layer also has a hollow area; The optical sensor is also used to collect color information of the light transmitted by the hollow area.

2. The fingerprint recognition structure according to claim 1, It is characterized in that The area of ​​the hollowed-out area is greater than or equal to the area of ​​each of the sub-identification areas.

3. The fingerprint recognition structure according to claim 1, It is characterized in that The hollow area is provided with a filling layer; the material of the filling layer includes: transparent material or white photoresist.

4. The fingerprint recognition structure according to claim 1, It is characterized in that The optical sensors all include: a photodiode.

5. A display module, It is characterized in that It comprises the fingerprint recognition structure as described in any one of claims 1 to 4.

6. The display module according to claim 5, It is characterized in that The display module further includes: a display panel and a collimation structure; The fingerprint recognition structure is located on a side of the display surface away from the display panel; The alignment structure is located between the fingerprint recognition structure and the display panel.

7. The display module according to claim 5, It is characterized in that The display module further includes: a backlight structure; The fingerprint identification structure is located on a side close to the light emitting surface of the backlight structure.

8. A display device, It is characterized in that Comprising a display module as described in any one of claims 5-7.

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