CN112825126A - Fingerprint identification device and detection method thereof - Google Patents
Fingerprint identification device and detection method thereof Download PDFInfo
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- CN112825126A CN112825126A CN201911147273.8A CN201911147273A CN112825126A CN 112825126 A CN112825126 A CN 112825126A CN 201911147273 A CN201911147273 A CN 201911147273A CN 112825126 A CN112825126 A CN 112825126A
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- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
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Abstract
A fingerprint identification device and a detection method thereof are provided, the fingerprint identification device comprises: the touch screen comprises a sensing surface and a light-emitting unit, wherein the light-emitting unit emits light rays which form reflected light through the sensing surface and are output; an optical sensor having a pixel array on a surface thereof, the pixel array including a plurality of pixels; the color filter unit comprises a plurality of color filters, the color filters are positioned on the pixel points, and at least one pixel point is arranged between different color filters; and judging whether the reflected light is formed by the reflection of the surface of a finger or not according to the intensity difference of the reflected light received by the pixel points covered by the color filters. The invention is beneficial to realizing the function of distinguishing true and false fingerprints and simultaneously ensuring the fingerprint imaging quality.
Description
Technical Field
The invention relates to the technical field of fingerprint identification, in particular to a fingerprint identification device and a detection method thereof.
Background
The fingerprint identification device can realize automatic fingerprint acquisition and is widely applied to equipment such as attendance machines, access controls, mobile phones or tablet computers.
According to the principle of fingerprint imaging, fingerprint identification devices can be classified into optical fingerprint identification devices, semiconductor capacitance identification devices, semiconductor heat-sensitive identification devices, semiconductor pressure-sensitive identification devices, and the like.
The optical fingerprint identification device mainly utilizes the refraction and reflection principles of light, the refraction angle of light emitted by a light source on uneven lines of fingerprints on the surface of a finger and the brightness of the reflected light are different, and a CMOS (complementary Metal Oxide semiconductor) optical device correspondingly collects picture information with different brightness degrees, so that the collection of the fingerprints is completed. The optical fingerprint identification device has strong environmental adaptability, good stability and low production cost, so the optical fingerprint identification device is widely applied.
In order to prevent a part of people from pressing the optical fingerprint identification device by using the false fingerprint instead of a real finger, the optical fingerprint identification device needs to have a certain detection function on the true and false fingerprints. The function of distinguishing the true and false fingerprints is concerned with the use safety of the equipment and the personal privacy of the user, and has important significance for the application and popularization of the optical fingerprint identification device.
However, the structure of the existing optical fingerprint recognition device still needs to be improved.
Disclosure of Invention
The invention provides a fingerprint identification device and a detection method thereof, which are beneficial to realizing the function of distinguishing true fingerprints from false fingerprints and ensuring the imaging quality of the fingerprints.
To solve the above problems, the present invention provides a fingerprint identification device, comprising: the touch screen comprises a sensing surface and a light-emitting unit, wherein the light-emitting unit emits light rays which form reflected light through the sensing surface and are output; an optical sensor having a pixel array on a surface thereof, the pixel array including a plurality of pixels; the color filter unit comprises a plurality of color filters, the color filters are positioned on the pixel points, and at least one pixel point is arranged between different color filters; and judging whether the reflected light is formed by the reflection of the surface of a finger or not according to the intensity difference of the reflected light received by the pixel points covered by the color filters.
Optionally, at least one pixel point is spaced between the color filters in the same row or the same column of the pixel point array.
Optionally, the size of the pixel point is 50 μm to 100 μm.
Optionally, the color filter at least includes two of a red light filter, a green light filter, or a blue light filter.
Optionally, the number of the color filter units is one or more.
Optionally, when the number of the color filter units is multiple, there is a space between different color filter units.
Optionally, the pitch of the color filter units is larger than 3mm and smaller than 12 mm.
Optionally, the fingerprint identification apparatus further includes: and the processor judges whether the reflected light is formed by the reflection of the surface of the finger according to the intensity difference of the reflected light received by the pixel points covered by the different color filters.
The invention provides a detection method of the fingerprint identification device, which comprises the following steps: providing a touch screen, wherein the touch screen comprises a sensing surface and a light-emitting unit, the light-emitting unit emits light, and the light forms reflected light through the sensing surface and is output; providing an optical sensor, wherein the surface of the optical sensor is provided with a pixel point array, and the pixel point array comprises a plurality of pixel points; providing a color filter unit, wherein the color filter unit comprises a plurality of color filters, the color filters are positioned on the pixel points, and at least one pixel point is arranged between different color filters; the color filter receives the reflected light and carries out filtering processing on the reflected light; the pixel points covered by the color filter receive the reflected light after the filtering treatment; judging whether the reflected light is formed by the reflection of the surface of a finger or not according to the intensity difference of the reflected light received by the pixel points covered by the color filters; and forming a fingerprint image according to the reflected light received by each pixel point.
Optionally, the color filter at least includes two of a red light filter, a green light filter, or a blue light filter.
Optionally, when the color filter includes a red light filter, a green light filter, and a blue light filter, whether the reflected light is formed by reflection of the surface of a finger is determined according to the intensity ratio of the reflected light received by the pixel points covered by the red light filter, the green light filter, and the blue light filter.
Optionally, when the color filter includes two of a red light filter, a green light filter, or a blue light filter, the method further includes: acquiring the intensity of reflected light received by one pixel point covered by the color filter as first light intensity; obtaining the intensity of reflected light received by the pixel point covered by the other color filter as a second light intensity; acquiring the intensity of reflected light received by the single pixel point exposed by the color filter unit as total light intensity, wherein the difference value between the sum of the first light intensity and the second light intensity and the total light intensity is third light intensity; and judging whether the reflected light is formed by the reflection of the surface of the finger according to the ratio of the first light intensity, the second light intensity and the third light intensity.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the optical sensor surface has an array of pixel points comprising a plurality of pixel points. The color filter unit comprises a plurality of color filters, the color filters are positioned on the pixel points, and the color filters only allow reflected light in a certain waveband range to penetrate through. According to the intensity difference of the reflected light received by the pixel points covered by the color filters, the light quantity of monochromatic light in different wave band ranges contained in the reflected light can be obtained, and therefore whether the reflected light is formed by the reflection of the surface of a finger or not can be judged. At least one pixel point is arranged between different color filters at intervals, and the pixel points at intervals can be used for compensating and correcting the light signals received by the pixel points covered by the color filters, so that the influence of the light signal attenuation caused by the color filters on the imaging quality of a fingerprint image is prevented, and the imaging quality of the optical sensor is improved.
In an alternative scheme, when the color filter comprises a red light filter, a green light filter and a blue light filter, according to the intensity ratio of reflected light received by pixel points covered by the red light filter, the green light filter and the blue light filter, the light quantities of a red light wave band, a green light wave band and a blue light wave band contained in the reflected light can be obtained, the comparison is more precise, and the accuracy of true and false fingerprint judgment can be further improved.
Drawings
FIG. 1 is a schematic diagram of a fingerprint identification device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the arrangement of the color filter units shown in FIG. 1 on the pixel array;
FIG. 3 is a schematic diagram of the arrangement of color filter elements on a pixel array according to another embodiment;
FIG. 4 is a schematic diagram illustrating the arrangement of color filter elements on a pixel array according to another embodiment;
FIG. 5 is a schematic diagram illustrating the arrangement of color filter elements on a pixel array according to yet another embodiment;
fig. 6 to 8 are schematic structural diagrams corresponding to steps of a detection method of a fingerprint identification device according to an embodiment of the present invention.
Detailed Description
Now analyzed in connection with a fingerprint identification device, the fingerprint identification device comprising: the touch screen comprises a sensing surface and a light-emitting unit, wherein the light-emitting unit emits light rays which form reflected light through the sensing surface and are output; the surface of the optical sensor is provided with a pixel point array, the pixel point array comprises a plurality of pixel points, and the plurality of pixel points comprise first-type pixel points and second-type pixel points; the color filters are positioned on the second type pixel points and are closely arranged; the intensity of the optical signal received by the second type of pixel points and the intensity of the optical signal received by the first type of pixel points are used for judging whether the reflected light is formed by reflection of the surface of a finger.
Although the fingerprint identification device can realize the function of identifying true and false fingerprints, the color filter only allows light rays in a specific wave band range to pass through, so that the intensity of the reflected light received by the second type of pixel points is attenuated to a certain extent compared with the intensity of the reflected light received by the first type of pixel points. The plurality of color filters are closely arranged, so that the light signals received by the pixel point areas covered by the plurality of color filters are attenuated light signals, and the pixel point areas covered by the plurality of color filters have too many bad points, thereby causing poor fingerprint image imaging quality.
The inventor researches the fingerprint identification device, and through creative work, the inventor notices that at least one pixel point is spaced between different color filters, so that the fingerprint image can be corrected conveniently, and the imaging quality of the fingerprint image can be improved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, a fingerprint recognition device 100 includes: touch screen 110, light collimating layer 120, color filter unit 200, optical sensor 300, and a processor (not shown). The touch screen 110 includes a sensing surface 101 and a light-emitting unit 114, wherein the light-emitting unit 114 emits light, and the light forms reflected light through the sensing surface 101 and is output; the light collimation layer 120 is adapted to receive reflected light emitted by the touch screen 110, perform collimation processing on the reflected light, and output the collimated light; the optical sensor 300 is adapted to receive the reflected light output by the light collimating layer 120, forming a fingerprint image; the color filter unit 200 is disposed between the light collimating layer 120 and the optical sensor 300, and is adapted to filter a part of the reflected light; the processor is adapted to determine whether the reflected light is formed by reflection from a finger surface.
When the user presses the sensing surface 101 with a finger, the light emitted from the light emitting unit 114 is reflected by the finger surface to form the reflected light. Since the finger surface includes uneven ridges and valleys, wherein the valleys are in contact with the sensing surface 101, and the ridges are not in contact with the sensing surface 101, the intensity of the reflected light formed at the ridges and the valleys is different, and thus the reflected light carries fingerprint information.
The touch screen 110 includes a bottom plate 111, a top plate 112 and a protective layer 113, the top plate 112 and the bottom plate 111 enclose an accommodating space, and the light emitting unit 114 is located in the accommodating space; the protective layer 113 covers the surface of the top plate 112, and the top surface of the protective layer 113 serves as the sensing surface 101.
In this embodiment, the light collimating layer 120 has a plurality of collimating units 121 arranged in parallel therein, where the collimating units 121 include light transmitting pillars and light shielding layers, and the light shielding layers cover the side wall surfaces of the light transmitting pillars. The reflected light with the excessively large inclination angle of the light direction is absorbed by the light shielding layer and is filtered, and the reflected light with the inclination angle of the light direction within the proper range passes through the light transmission column.
The collimating unit 121 helps to improve the uniformity of the direction of the reflected light received by the optical sensor 300, which can improve the quality of the fingerprint image.
In other embodiments, the collimating unit includes a convex lens group (not shown in the figure) and a transparent small hole group (not shown in the figure), the convex lens group is disposed between the touch screen 110 and the transparent small hole group, the convex lens group includes a plurality of convex lenses, the transparent small hole group includes a plurality of transparent small holes, and the convex lenses correspond to the transparent small holes one to one.
The convex lens is adapted to converge the reflected light output by the touch screen 110, so as to modulate the direction of the reflected light, and reduce the inclination angle of a part of the reflected light, so that the reflected light is pre-collimated before being received by the small light-transmitting hole.
Referring to fig. 2, the optical sensor 300 has a pixel array 310 on a surface thereof, and the pixel array 310 includes a plurality of pixels 311.
The size of the pixel 311 is 50 μm to 100 μm.
In this embodiment, the pixel 311 is rectangular. The length range of the rectangle is 50-100 mu m, and the width range of the rectangle is 50-100 mu m. The length direction of the rectangle is a first direction x, the width direction of the rectangle is a second direction y, and the second direction y is perpendicular to the first direction x.
The color filter unit 200 includes a plurality of color filters, the color filters are located on the pixel points 311, and at least one pixel point 311 is spaced between different color filters.
The reflected light received by the pixel points 311 between the color filters is not subjected to filtering processing, so that the light intensity value is high, and the light signals received by the pixel points 311 covered by the color filters can be compensated and corrected, which is beneficial to improving the imaging quality of fingerprint images.
The color filter at least comprises two of a red light filter, a green light filter or a blue light filter.
In the present embodiment, the color filters include a red light filter 210, a green light filter 220, and a blue light filter 230. The red filter 210 allows only light in a red wavelength band to pass therethrough. The green filter 220 allows only light in the green wavelength band to pass therethrough. The blue filter 230 allows only light in the blue band to pass through.
In this embodiment, the materials of the red light filter 210, the green light filter 220, and the blue light filter 230 are all organic materials.
In this embodiment, the transmittance of the red light filter 210 to red light with a wavelength of 600nm is greater than 50%; the transmittance of the red light filter 210 to green light with the wavelength of 530nm is less than 10%; the transmittance of the red light filter 210 to blue light with a wavelength of 460nm is less than 10%.
In this embodiment, the transmittance of the green light filter 220 to green light with a wavelength of 530nm is greater than 50%; the transmittance of the green light filter 220 to red light with the wavelength of 600nm is less than 10 percent; the transmittance of the green light filter 220 to blue light with a wavelength of 460nm is less than 10%.
In this embodiment, the transmittance of the blue light filter 230 to blue light with a wavelength of 460nm is greater than 50%; the transmittance of the blue light filter 230 to red light with the wavelength of 600nm is less than 10%; the transmittance of the blue light filter 230 to green light with a wavelength of 530nm is less than 10%.
The processor determines whether the reflected light is formed by reflection of the surface of a finger according to the intensity ratio of the reflected light received by the pixel 311 covered by the red light filter 210, the green light filter 220 and the blue light filter 230.
A method for determining a true or false fingerprint will be described in detail by taking a reflected light reflected by a finger surface as a first reflected light and a reflected light formed by pressing the sensing surface 101 of the touch screen 110 with a sheet printed with a false fingerprint as a second reflected light.
In this embodiment, the light emitted by the light emitting unit 114 is white light. The white light is composite light and is the mixture of all colors of visible light. When a user presses the sensing surface 101 with a finger, the white light irradiates the surface of the finger, the formed first reflected light is also composite light, and the color of the first reflected light is consistent with the color of the surface of the finger. In other embodiments, the light emitted by the light emitting unit 114 at least includes red light, green light and blue light.
When the sensing surface 101 of the touch screen 110 is pressed by a paper printed with a fake fingerprint, the white light emitted by the light emitting unit 114 irradiates the surface of the paper, and the color of the second reflected light is formed to be consistent with the color of the paper. The paper color is different from the color of the surface of the real finger. In this example, the paper was white. In other embodiments, the paper may also be green or blue in color.
In this embodiment, when the user presses the sensing surface 101 with a finger, the ratio of the light amounts of the first reflected light including the red light band, the green light band and the blue light band is a first ratio. The first reflected light irradiates the surface of the optical sensor 300 provided with the color filter unit 200, and the first reflected light intensity ratio received by the pixel point 311 covered by the red light filter 210, the green light filter 220 and the blue light filter 230 is consistent with the first ratio.
In this embodiment, when the sensing surface 101 of the touch screen 110 is pressed by a paper printed with a fake fingerprint, the second reflected light includes a second ratio of the light quantity of the red light band, the green light band and the blue light band. The second reflected light irradiates the surface of the optical sensor 300 provided with the color filter unit 200, and the ratio of the intensity of the second reflected light received by the pixel points 311 covered by the red light filter 210, the green light filter 220, and the blue light filter 230 is consistent with the second ratio.
In this embodiment, the processor may be configured to judge whether the fingerprint is a true fingerprint or a false fingerprint by using a difference between the first ratio and the second ratio.
Under the condition that whether the reflected light is formed by reflection of the finger surface is unknown, the intensity of the reflected light received by the pixel 311 covered by the red light filter 210 is used as a first light intensity, namely the intensity of the red light received by the pixel 311 covered by the red light filter 210. The intensity of the reflected light received by the pixel 311 covered by the green light filter 220 is used as a second light intensity, that is, the intensity of the green light received by the pixel 311 covered by the green light filter 220. The intensity of the reflected light received by the pixel 311 covered by the blue light filter 230 is used as a third light intensity, that is, the intensity of the blue light received by the pixel 311 covered by the blue light filter 230. The processor obtains the proportion of the first light intensity, the second light intensity and the third light intensity, and if the proportion of the first light intensity, the second light intensity and the third light intensity is consistent with or close to the first proportion, the processor judges that the reflected light is formed by the reflection of the surface of the finger. And if the proportion of the first light intensity, the second light intensity and the third light intensity is consistent with or close to the second proportion, judging that the reflected light is formed by false fingerprints.
In this embodiment, at least one pixel 311 is spaced between different color filters. Specifically, at least one pixel 311 is spaced between the color filters in the same row or the same column of the pixel dot array 310.
It should be noted that, when the two color filters are located in different rows and different columns of the pixel array 310, the vertex angles of the pixels 311 covered by the two color filters may be in contact with each other. In addition, a plurality of rows or a plurality of columns of pixel points 311 may be spaced between the pixel points 311 covered by the two color filters.
The color filter unit 200 includes one or more of the red filters 210; the color filter unit 200 includes one or more of the green filters 220; the color filter unit 200 includes one or more blue filters 230.
In this embodiment, the color filter unit 200 includes a plurality of the red light filters 210, a plurality of the green light filters 220, and a plurality of the blue light filters 230. By obtaining the average value of the intensity of the reflected light received by the pixel 311 covered by the plurality of red light filters 210 as the first light intensity, obtaining the average value of the intensity of the reflected light received by the pixel 311 covered by the plurality of green light filters 220 as the second light intensity, obtaining the average value of the intensity of the reflected light received by the pixel 311 covered by the plurality of blue light filters 230 as the third light intensity, whether the reflected light is formed by the reflection of the surface of the finger is judged, and the accuracy of judging the true and false fingerprints can be further improved.
The number of the color filter units 200 is one or more.
In this embodiment, the number of the color filter units 200 is plural, and different color filter units 200 have a space therebetween. The boundaries of the color filter unit 200 are shown by dashed boxes in fig. 2. The reflected light received by the pixel points 311 located between the color filter units 200 is not subjected to filtering processing, so that the intensity value of the reflected light is high, which is beneficial to improving the definition of the formed fingerprint image.
In this embodiment, the distance between the color filter units 200 is greater than 3mm and smaller than 12 mm. If the distance between the color filter units 200 is too small, the density of the color filter units 200 covering the optical sensor 300 is too large, so that most of the pixels 311 are covered by the color filter units 200, and thus the received optical signals are attenuated, which causes poor quality of the fingerprint image formed by the optical sensor 300, and affects the fingerprint identification performance of the optical sensor 300. If the distance between the color filter units 200 is too large, when a user presses the sensing surface 101 with a finger, the finger surface is difficult to cover all the color filter units 200, and a part of the color filter units 200 may not receive the reflected light, which may affect the accuracy of the color filter units 200 in determining the true and false fingerprints.
The distance between the color filter units 200 includes a first distance and a second distance, the first distance is the shortest distance between two color filter units 200 along the first direction x, the second distance is the shortest distance between two color filter units 200 along the second direction y, the first distance is greater than 3mm and less than 12mm, and the second distance is greater than 3mm and less than 12 mm.
In other embodiments, referring to fig. 3 to 5, the color filter unit 200 may further include only two of the red light filter 210, the green light filter 220, or the blue light filter 230, which is helpful to simplify the manufacturing process of the color filter unit 200, improve the production yield of the color filter unit 200, and reduce the production cost of the fingerprint identification device 100.
Referring to fig. 3, the color filter unit 200 is described as including only a red filter 210 and a green filter 220.
The intensity of the reflected light received by the pixel 311 covered by the red light filter 210 is used as the first light intensity. The intensity of the reflected light received by the pixel 311 covered by the green light filter 220 is used as a second light intensity. The intensity of the reflected light received by the single pixel 311 between the red light filter 210 and the green light filter 220 is used as the total light intensity. The difference between the sum of the first light intensity and the second light intensity and the total light intensity is a third light intensity, which is a blue light intensity included in the reflected light irradiated onto the optical sensor 300. And the processor judges whether the reflected light is formed by the reflection of the surface of the finger according to the proportion of the first light intensity, the second light intensity and the third light intensity.
In addition, the processor can also directly judge whether the reflected light is formed by the reflection of the finger surface according to the proportion of the first light intensity and the second light intensity.
In another embodiment, referring to fig. 4, the color filter unit 200 includes only the red light filter 210 and the blue light filter 230.
The intensity of the reflected light received by the pixel 311 covered by the red light filter 210 is used as the first light intensity. The intensity of the reflected light received by the pixel 311 covered by the blue light filter 230 is used as the second light intensity. The intensity of the reflected light received by the single pixel 311 between the red light filter 210 and the blue light filter 230 is used as the total light intensity. The difference between the sum of the first light intensity and the second light intensity and the total light intensity is a third light intensity, which is the intensity of green light included in the reflected light irradiated onto the optical sensor 300. And the processor judges whether the reflected light is formed by the reflection of the surface of the finger according to the ratio of the first light intensity, the second light intensity and the third light intensity.
In another embodiment, referring to fig. 5, the color filter unit 200 includes only a green filter 220 and a blue filter 230.
The intensity of the reflected light received by the pixel 311 covered by the green filter 220 is used as the first light intensity. The intensity of the reflected light received by the pixel 311 covered by the blue light filter 230 is used as the second light intensity. The intensity of the reflected light received by the single pixel 311 between the green filter 220 and the blue filter 230 is taken as the total light intensity. The difference between the sum of the first light intensity and the second light intensity and the total light intensity is a third light intensity, which is the intensity of red light included in the reflected light irradiated onto the optical sensor 300. And the processor judges whether the reflected light is formed by the reflection of the surface of the finger according to the ratio of the first light intensity, the second light intensity and the third light intensity.
The present invention further provides a detection method of the fingerprint identification apparatus 100, and the fingerprint identification method is described in detail below with reference to fig. 6 to 8.
Referring to fig. 6, a touch screen 110 is provided, where the touch screen 110 includes a sensing surface 101 and a light emitting unit 114, and the light emitting unit 114 emits light, and the light passes through the sensing surface 101 to form a reflected light 400 and is output.
The reflected light 400 formed by the sensing face 101 is diverging light.
In this embodiment, the light emitted by the light emitting unit 114 is white light. In other embodiments, the light emitted by the light emitting unit 114 at least includes red light, green light and blue light.
Referring to fig. 7, the collimating unit 121 in the light collimating layer 120 receives the reflected light 400 and collimates the reflected light 400.
The collimating unit 121 includes a light-transmitting pillar and a light-shielding layer, and the light-shielding layer covers a sidewall surface of the light-transmitting pillar.
In the collimation process, the reflected light 400 with the excessively large inclination angle of the light direction is absorbed by the light shielding layer and is filtered, and the reflected light 400 with the inclination angle of the light direction within the proper range passes through the light transmission column.
In other embodiments, a convex lens group (not shown) is disposed between the touch screen 110 and the light collimating layer 120. Before the collimation processing, the reflected light 400 further includes: the reflected light 400 is converged by the convex lens group. The convergence process can act as a pre-collimation.
Referring to fig. 8, an optical sensor 300 is provided, the optical sensor 300 has a pixel array 310 on a surface thereof, the pixel array 310 includes a plurality of pixels 311; providing a color filter unit 200, wherein the color filter unit 200 comprises a plurality of color filters, the color filters are located on the pixel points 311, and at least one pixel point 311 is spaced between different color filters; the color filter receives the reflected light 400 and performs filtering processing on the reflected light 400; the pixel 311 covered by the color filter receives the reflected light 400 after the filtering processing; and judging whether the reflected light 400 is formed by the reflection of the finger surface or not according to the intensity difference of the reflected light 400 received by the pixel point 311 covered by each color filter.
The color filter at least comprises two of a red light filter, a green light filter or a blue light filter.
In the present embodiment, the color filters include a red light filter 210, a green light filter 220, and a blue light filter 230. The detection method comprises the following steps: and judging whether the reflected light 400 is formed by the reflection of the finger surface or not according to the intensity ratio of the reflected light 400 received by the pixel point 311 covered by the red light filter 210, the green light filter 220 and the blue light filter 230.
In other embodiments, the color filters include only two of the red light filters 210, the green light filters 220, or the blue light filters 230. The detection method comprises the following steps: acquiring the intensity of reflected light 400 received by one pixel 311 covered by the color filter as a first light intensity; acquiring the intensity of the reflected light 400 received by the pixel 311 covered by the other color filter as a second light intensity; acquiring the intensity of the reflected light 400 received by the single pixel point 311 exposed by the color filter unit 200 as a total light intensity, wherein the difference between the sum of the first light intensity and the second light intensity and the total light intensity is a third light intensity; and judging whether the reflected light 400 is formed by the reflection of the surface of the finger according to the ratio of the first light intensity, the second light intensity and the third light intensity.
The color filter includes only two of the red light filter 210, the green light filter 220, or the blue light filter 230, which is helpful to simplify the manufacturing process of the color filter unit 200, improve the manufacturing yield, and reduce the production cost.
In one embodiment, the color filter unit 200 includes only a red filter 210 and a green filter 220.
The intensity of the reflected light 400 received by the pixel 311 covered by the red light filter 210 is used as the first light intensity. The intensity of the reflected light 400 received by the pixel 311 covered by the green filter 220 is used as the second light intensity. The intensity of the reflected light 400 received by a single pixel 311 located between the red light filter 210 and the green light filter 220 is taken as the total light intensity. The difference between the sum of the first light intensity and the second light intensity and the total light intensity is a third light intensity, which is the intensity of blue light included in the reflected light 400 irradiated onto the optical sensor 300. The processor determines whether the reflected light 400 is formed by reflection of the surface of the finger according to the ratio of the first light intensity, the second light intensity and the third light intensity.
In another embodiment, the color filter unit 200 includes only the red light filter 210 and the blue light filter 230. In another embodiment, the color filter unit 200 includes only the green filter 220 and the blue filter 230.
The detection method further comprises the following steps: and forming a fingerprint image according to the reflected light 400 received by each pixel point 311.
In this embodiment, if it is determined that the reflected light 400 is formed by reflection from the surface of a finger, a fingerprint image is formed according to the reflected light 400 received by each pixel 311.
Because at least one pixel point 311 is arranged between the color filter, the reflected light 400 received by the pixel point 311 between the color filters is not processed by filtered light, so that the light intensity is high, the light signals received by the pixel point 311 covered by the color filters can be compensated and corrected, and the imaging quality of the fingerprint image can be improved.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (12)
1. A fingerprint recognition device, comprising:
the touch screen comprises a sensing surface and a light-emitting unit, wherein the light-emitting unit emits light rays which form reflected light through the sensing surface and are output;
an optical sensor having a pixel array on a surface thereof, the pixel array including a plurality of pixels;
the color filter unit comprises a plurality of color filters, the color filters are positioned on the pixel points, and at least one pixel point is arranged between different color filters;
and judging whether the reflected light is formed by the reflection of the surface of a finger or not according to the intensity difference of the reflected light received by the pixel points covered by the color filters.
2. The fingerprint recognition device of claim 1, wherein at least one of said pixels is spaced between said color filters on a same row or a same column of said pixel array.
3. The fingerprint recognition apparatus according to claim 1 or 2, wherein the size of said pixel is 50 μm to 100 μm.
4. The fingerprint recognition device of claim 1, wherein the color filter comprises at least two of a red filter, a green filter, or a blue filter.
5. The fingerprint recognition apparatus of claim 1, wherein the number of the color filter units is one or more.
6. The fingerprint recognition device according to claim 5, wherein when said color filter elements are plural in number, different ones of said color filter elements have a spacing therebetween.
7. The fingerprint recognition device of claim 6, wherein the pitch of different color filter elements is greater than 3mm and less than 12 mm.
8. The fingerprint recognition device of claim 1, further comprising: and the processor judges whether the reflected light is formed by the reflection of the surface of the finger according to the intensity difference of the reflected light received by the pixel points covered by the different color filters.
9. A method for detecting a fingerprint recognition device according to claim 1, comprising:
providing a touch screen, wherein the touch screen comprises a sensing surface and a light-emitting unit, the light-emitting unit emits light, and the light forms reflected light through the sensing surface and is output;
providing an optical sensor, wherein the surface of the optical sensor is provided with a pixel point array, and the pixel point array comprises a plurality of pixel points;
providing a color filter unit, wherein the color filter unit comprises a plurality of color filters, the color filters are positioned on the pixel points, and at least one pixel point is arranged between different color filters;
the color filter receives the reflected light and carries out filtering processing on the reflected light;
the pixel points covered by the color filter receive the reflected light after the filtering treatment;
judging whether the reflected light is formed by the reflection of the surface of a finger or not according to the intensity difference of the reflected light received by the pixel points covered by the color filters;
and forming a fingerprint image according to the reflected light received by each pixel point.
10. The detection method of claim 9, wherein the color filter comprises at least two of a red filter, a green filter, or a blue filter.
11. The detecting method of claim 10, wherein when the color filter includes a red filter, a green filter and a blue filter, whether the reflected light is formed by reflection of a finger surface is determined according to a ratio of intensity of reflected light received by pixels covered by the red filter, the green filter and the blue filter.
12. The detecting method as claimed in claim 10, wherein when the color filter includes two of a red filter, a green filter or a blue filter, further comprising:
acquiring the intensity of reflected light received by one pixel point covered by the color filter as first light intensity;
obtaining the intensity of reflected light received by the pixel point covered by the other color filter as a second light intensity;
acquiring the intensity of reflected light received by the single pixel point exposed by the color filter unit as total light intensity, wherein the difference value between the sum of the first light intensity and the second light intensity and the total light intensity is third light intensity;
and judging whether the reflected light is formed by the reflection of the surface of the finger according to the ratio of the first light intensity, the second light intensity and the third light intensity.
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