CN111291719A - Fingerprint identification device, display panel, equipment and fingerprint identification method - Google Patents
Fingerprint identification device, display panel, equipment and fingerprint identification method Download PDFInfo
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- CN111291719A CN111291719A CN202010145557.XA CN202010145557A CN111291719A CN 111291719 A CN111291719 A CN 111291719A CN 202010145557 A CN202010145557 A CN 202010145557A CN 111291719 A CN111291719 A CN 111291719A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/1382—Detecting the live character of the finger, i.e. distinguishing from a fake or cadaver finger
- G06V40/1394—Detecting the live character of the finger, i.e. distinguishing from a fake or cadaver finger using acquisition arrangements
Abstract
The invention provides a fingerprint identification device, a display panel, equipment and a fingerprint identification method, and relates to the technical field of display terminals. The fingerprint identification device is arranged below a display panel, and the display panel comprises a first fingerprint area and a second fingerprint area; the first fingerprint area comprises at least two pixel units, and the color of a first light signal emitted by each pixel unit is the same; the second fingerprint area comprises a plurality of sub-areas, and the colors of second optical signals emitted by at least two sub-areas are different; the fingerprint identification device comprises a first photosensitive sensing unit and a second photosensitive sensing unit; the first photosensitive sensing unit is used for receiving a first optical return signal; the second light sensitive sensing unit is used for receiving a second light return signal. The technical problems of complex manufacturing process and high manufacturing cost of the existing living fingerprint identification technology are solved.
Description
Technical Field
The invention relates to the technical field of display terminals, in particular to a fingerprint identification device, a display panel, equipment and a fingerprint identification method.
Background
The full-screen mobile phone is the mainstream configuration of the current mobile phone, and the use of the full-screen mobile phone also makes the underscreen fingerprint identification technology become a popular research direction. The technology of identifying fingerprints under the screen has been developed for a long time, and is mature in the aspect of identifying fingerprint images.
At present, consumers put forward higher requirements on fingerprint identification technology, namely, a living fingerprint detection function is required to be added so as to judge whether the acquired fingerprint image is originated from a real finger or a fake finger. But no effective and low-cost solution has been found to solve the above problems.
Disclosure of Invention
The invention aims to provide a fingerprint identification device, a display panel, equipment and a fingerprint identification method, so as to solve the technical problems of complex manufacturing process and high manufacturing cost of the existing living fingerprint identification technology.
In a first aspect, the present invention provides a fingerprint identification device disposed below a display panel, the display panel including a first fingerprint area and a second fingerprint area; the first fingerprint area comprises at least two pixel units, and the color of a first light signal emitted by each pixel unit is the same; the second fingerprint area comprises a plurality of sub-areas, and the colors of the second optical signals emitted by at least two sub-areas are different; the fingerprint identification device comprises a first photosensitive sensing unit and a second photosensitive sensing unit; the first photosensitive sensing unit is used for receiving a first optical return signal, and the first optical return signal is formed by an optical signal which is emitted by the first fingerprint area and is reflected by a finger; the second photosensitive sensing unit is used for receiving a second light return signal, and the second light return signal is formed by a light signal which is emitted by the second fingerprint area and is reflected by the finger.
Further, the fingerprint identification device sequentially comprises a photosensitive sensor array and a collimating optical structure from bottom to top; the photosensitive sensor array comprises a silicon-based substrate, and a plurality of first photosensitive sensing units and a plurality of second photosensitive sensing units which are formed on the silicon-based substrate; the first light return signal reaches the first photosensitive sensing unit through the collimating optical structure; the second optical return signal reaches the second light-sensitive sensing unit through the collimating optical structure.
Further, the collimating optical structure includes a microlens layer and at least one light shielding layer; the micro-lens layer comprises a plurality of micro-lenses, and a plurality of pinhole structures are formed in the shading layer; the first light return signal reaches the first photosensitive sensing unit through the micro-lens and the pinhole structure; the second optical return signal reaches the second light sensitive sensing unit through the micro-lens and the pinhole structure.
Furthermore, the shading layer is multi-layer; a transparent optical layer is filled between two adjacent light shielding layers; the microlens layer is arranged above the shading layer, and a transparent optical layer is filled between the uppermost shading layer and the microlens layer.
Further, an infrared filter layer is arranged above the first photosensitive sensing unit and the second photosensitive sensing unit.
Furthermore, metal layers are formed on the first photosensitive sensing unit and the second photosensitive sensing unit, and light holes corresponding to the first photosensitive sensing unit and the second photosensitive sensing unit are formed in the metal layers.
Furthermore, a signal line is arranged in the photosensitive sensor array; every n second photosensitive sensing units are connected to the same signal line as a group.
In a second aspect, the present invention provides a display panel, disposed above a fingerprint recognition device, including a first fingerprint area and a second fingerprint area; the pixel unit in the first fingerprint area sends out a first optical signal, and the first optical signal reaches a first photosensitive sensing unit in the fingerprint identification device after being reflected by a finger; the first fingerprint area comprises at least two pixel units, and the color of a first light signal emitted by each pixel unit is the same; the pixel unit in the second fingerprint area sends out a second optical signal, and the second optical signal reaches a second photosensitive sensing unit in the fingerprint identification device after being reflected by the finger; the second fingerprint area comprises a plurality of sub-areas, and the colors of the second light signals emitted by at least two sub-areas are different.
Further, the second fingerprint area is arranged outside or inside the first fingerprint area.
Further, the plurality of sub-areas of the second fingerprint area are connected.
Further, the plurality of sub-areas of the second fingerprint area are distributed in a discrete shape.
Further, each sub-region has a size of 1 pixel unit, 2 × 2 pixel units, or 3 × 3 pixel units.
Further, the red sub-pixel, the green sub-pixel and the blue sub-pixel in the pixel unit in the first fingerprint area emit light; or the green sub-pixel and the blue sub-pixel in the pixel unit in the first fingerprint area emit light; or the green sub-pixel in the pixel unit in the first fingerprint area emits light.
Further, the red sub-pixel in the pixel unit in each sub-area emits light; or, the green sub-pixel in the pixel unit in each sub-area emits light; alternatively, the blue sub-pixel in the pixel unit in each sub-area emits light.
Further, a first optical signal emitted by a pixel unit in the first fingerprint area is used for fingerprint image identification; and the second optical signals emitted by the pixel units in the second fingerprint area are used for fingerprint living body identification.
Furthermore, the pixel units in the second fingerprint area are also used for emitting third light signals with the same color as the first light signals emitted by the pixel units in the first fingerprint area; the first optical signal and the third optical signal are both used for fingerprint image identification; and the second optical signals emitted by the pixel units in the second fingerprint area are used for fingerprint living body detection.
Further, in the first and second biopsy, the color of the second light signal emitted from at least one sub-area in the second fingerprint area is different.
Further, in the first and second biopsy, the position and/or number of at least one sub-area in the second fingerprint area is changed.
Further, in the first and second biopsy, pixel units in at least one sub-area in the second fingerprint area are converted into pixel units in the first fingerprint area; and/or pixel cells in a partial region in the first fingerprint region are transformed into pixel cells in at least one sub-region in the second fingerprint region.
In a third aspect, the present invention provides an apparatus, which includes the fingerprint identification device and the display panel.
In a fourth aspect, the present invention provides a fingerprint identification method, applied to the above apparatus, the method including: controlling the pixel units in the first fingerprint area to send out first optical signals, and controlling the pixel units in the second fingerprint area to send out second optical signals; the fingerprint identification device comprises a first photosensitive sensing unit, a second photosensitive sensing unit and a control unit, wherein the first photosensitive sensing unit is used for acquiring a first optical return signal for fingerprint image identification, the second photosensitive sensing unit is used for acquiring a second optical return signal for fingerprint living body identification, the first optical return signal is formed by an optical signal of a first optical signal sent by a first fingerprint area after being reflected by a finger, and the second optical return signal is formed by an optical signal of a second optical signal sent by a second fingerprint area after being reflected by the finger.
The fingerprint identification device provided by the invention can be arranged below the display panel, and the ICON area of the display panel comprises a first fingerprint area and a second fingerprint area. When a finger needs to perform fingerprint identification in an ICON area, each pixel unit of the first fingerprint area sends out a first optical signal, the first optical signal forms a first optical return signal after being reflected by the finger, and the first optical return signal is received by a first photosensitive sensing unit in the fingerprint identification device and used for fingerprint image identification. The second fingerprint area sends out a second optical signal, the second optical signal forms a second optical return signal after being reflected by the finger, and the second optical return signal is received by a second photosensitive sensing unit in the fingerprint identification device and used for fingerprint living body identification. Because the colors of the second optical signals sent by the at least two sub-areas of the second fingerprint area are different, the second optical return signals received by the second photosensitive sensing unit also comprise at least two different colors, so that the living body detection of the finger can be realized by judging whether the finger is a real finger or a fake finger according to the difference of the absorption characteristics of the finger on the optical signals with different colors. Therefore, in the fingerprint identification device provided by the embodiment of the invention, the function of detecting the living fingerprints can be realized without additionally adding red, green and blue filter coatings, so that the technical problems of complex manufacturing process and higher manufacturing cost in the prior art are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a display panel according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a pixel unit in an ICON area according to an embodiment of the present invention;
FIG. 3 is a schematic partial plan view of a display panel according to an embodiment of the present invention;
FIG. 4 is a schematic partial cross-sectional view of a display panel according to an embodiment of the present invention;
FIG. 5 is a graph illustrating the received spectral intensity of a second light-sensitive sensing unit in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating connection relationships of signal lines according to an embodiment of the present invention;
fig. 7 is a partial schematic plan view of a display panel according to another embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a display panel, which can be applied to touch terminals such as mobile phones and tablet computers, is particularly suitable for full-screen mobile phones, and can solve the technical problems of complex manufacturing process and high manufacturing cost of the existing living fingerprint identification technology.
As shown in fig. 1 to 4, the embodiment of the invention provides a fingerprint identification device 2 and a display panel 1, wherein the fingerprint identification device 2 can be disposed below the display panel 1 to form a touch device 100. The display panel 1 may be an OLED display panel or a liquid crystal display panel. The display panel 1 and the fingerprint recognition device 2 may be fixed by a frame adhesive pad, and the middle is filled with air or a low refractive index substance. In the embodiment, an OLED display panel is taken as an example, and the OLED display panel generally includes a Cover Glass (Cover Glass)11, a polarizer and Touch panel (POL & Touch)12, an Encapsulation layer (Encapsulation)13, a light emitting layer 14 and a corresponding control circuit (not shown in the figure), and a back plate 15.
The display panel 1 includes a first fingerprint area 201 and a second fingerprint area 202, which constitute an ICON area 200 for recognizing a fingerprint, i.e., an area to be pressed by a finger when recognizing a fingerprint. The first fingerprint area 201 comprises at least two pixel units, and the color of the first light signal emitted by each pixel unit is the same; the second fingerprint area 202 includes a plurality of sub-areas, and at least two sub-areas emit second light signals with different colors.
The fingerprint recognition device 2 includes a first light-sensitive sensing unit 215 and a second light-sensitive sensing unit 216. The first photosensitive sensing unit 215 is configured to receive a first optical return signal, where the first optical return signal is formed by an optical signal of the first optical signal emitted from the first fingerprint area 201 after being reflected by the finger; the second photo sensor unit 216 is configured to receive a second optical return signal, where the second optical return signal is formed by an optical signal of the second optical signal emitted from the second fingerprint area 202 after being reflected by the finger.
When the touch device performs fingerprint identification, the pixel unit located in the light emitting layer 14 in the first fingerprint area 201 emits a first optical signal, the first optical signal is reflected by a finger to form a first optical return signal, and the first optical return signal reaches the first photosensitive sensing unit 215 in the fingerprint identification device 2, and the first optical signal has the same color, that is, a mixed color light or a monochromatic light with a uniform color. For example, in each pixel unit of the first fingerprint area 201, the red sub-pixel, the green sub-pixel and the blue sub-pixel all emit light, and then the first light signal is a mixed light (white after mixing) composed of three colors of red, green and blue; for example, in each pixel unit of the first fingerprint area 201, only the green sub-pixel and the blue sub-pixel emit light, and the first light signal is a mixed light composed of green and blue (cyan after mixing); also, for example, if only the green sub-pixel emits light in each pixel unit of the first fingerprint area 201, the first light signal is a single color of green light. That is, the mixed color light is a light signal in which sub-pixels of at least two colors emit light simultaneously and are mixed in one pixel unit. Monochromatic light is a single light signal formed by only one sub-pixel emitting light in one pixel unit.
The pixel unit in the second fingerprint area 202 located in the light emitting layer 14 emits a second light signal, and the second light signal is reflected by a finger to form a second light return signal, which reaches the second light-sensitive sensing unit 216 in the fingerprint identification device 2. The second fingerprint area 202 includes a plurality of sub-areas, and at least two sub-areas emit second light signals with different colors. When the sub-region has a plurality of pixel units, the colors of the second light signals emitted by the respective pixel units in the sub-region are the same, i.e. the second light signals in each sub-region are mixed light or monochromatic light with the same color.
The embodiment of the present invention utilizes the first photosensitive sensing unit 215 to receive the first optical return signal for recognizing the fingerprint image; the second light-sensitive sensing unit 216 is used to receive the second light-return signal for identifying the living fingerprint. Because the colors of the second optical signals emitted by the at least two sub-regions of the second fingerprint region 202 are different, the second optical return signal received by the second photosensitive sensing unit 216 also includes at least two different colors, i.e., the living body detection of the finger can be realized by using the difference of the absorption characteristics of the finger on the light with different colors to judge whether the finger is a real finger or a fake finger. Therefore, in the fingerprint identification device provided by the embodiment of the invention, the function of detecting the living fingerprint can be realized, so that the technical problems of complex manufacturing process and higher manufacturing cost in the prior art are solved.
In the fingerprint identification device of this embodiment, from bottom to top includes photosensitive sensor array and collimation optical structure in proper order. As shown in fig. 3 and 4, the photo sensor array includes a silicon-based substrate 210, and a plurality of first photo sensing units 215 and a plurality of second photo sensing units 216 formed on the silicon-based substrate 210, and the first photo sensing units 215 and the second photo sensing units 216 may be formed on the silicon-based substrate 210 through a patterning process. The first optical return signal reaches the first photosensitive sensing cell 215 through the collimating optical structure; the second optical return signal reaches the second light sensitive sensing unit 216 through the collimating optical structure.
The collimating optical structure in this embodiment includes at least one light-shielding layer 213 and a microlens layer. The light-shielding layer 213 has a plurality of pinhole structures 212 formed therein, and the microlens layer includes a plurality of microlenses 211. The first optical return signal reaches the first photosensitive sensing unit 215 through the micro-lens 211 and the pinhole structure 212; the second optical return signal reaches the second light sensitive sensing unit 216 via the micro-lens 211 and the pinhole structure 212.
The first optical return signal or the second optical return signal from the direction of the finger is focused by the micro-lens 211 and then enters the first photosensitive sensing unit 215 or the second photosensitive sensing unit 216 through the pinhole structure 212. Through the micro lens 211 and the pinhole structure 212, the first light return signal or the second light return signal can be emitted into the first photosensitive sensing unit 215 or the second photosensitive sensing unit 216 in a nearly vertical direction, the angle range of the first light return signal or the second light return signal is about +/-2 degrees, so that accurate acquisition of the light signals can be realized, and the problem of light mixing caused by the fact that a finger is far away from the first photosensitive sensing unit 215 or the second photosensitive sensing unit 216 is prevented.
In practical applications, since the pixel units in the display panel are also close to 1mm away from the finger, in the second fingerprint area 202, the light emitted from the red pixel and the blue pixel, for example, at the position beside the green pixel, also reaches the position corresponding to the finger of the green pixel, and the spectral distribution thereof is as shown in fig. 5, however, depending on the collimated receiving characteristic of the second photosensitive sensor unit 216, more green light information signals can be received. In a preferred embodiment, the second optical signal (the second optical return signal) includes red monochromatic light, blue monochromatic light and green monochromatic light, and the three monochromatic lights can determine the authenticity of the finger by the difference of the absorption characteristics of the real finger and the artificial finger for the red light, the green light and the blue light. And the authenticity of the finger can be more accurately distinguished by combining a deep learning fingerprint algorithm.
In this embodiment, the light-shielding layers 213 are formed in a plurality of layers, the transparent optical layer 214 is filled between two adjacent light-shielding layers 213, the microlens layer is disposed above the uppermost light-shielding layer 213, and the transparent optical layer 214 is also filled between the uppermost light-shielding layer 213 and the microlens layer. In this embodiment, the light-shielding layer 213 is three layers, the light-shielding layer 213 may be formed by an organic resin material, each light-shielding layer 213 has an opening, and the three openings in the same vertical direction form the pinhole structure 212, the smaller the aperture of the opening closer to the photosensor array.
Further, the aperture of the opening in the light shielding layer 213 closer to the light sensor array is smaller, so that when the light signal from the display panel direction passes through the opening in each light shielding layer 213, the aperture is gradually smaller, so as to filter the light signal layer by using the light shielding layer 213, and block the light signal with an oblique angle, so that the light signals received by the last first light sensing unit 215 and the second light sensing unit 216 are closer to the vertical direction. In one embodiment, the aperture of the opening in the light shielding layer 213 closest to the photosensor array may be 2-3 μm, the opening gradually increases with increasing distance from the photosensor array, and the aperture of the opening in the uppermost light shielding layer 213 may be within 10 μm.
In addition, the transparent optical layers 214 may be set to different thicknesses according to the influence degree of the transparent optical layers 214 at different heights on the crosstalk phenomenon, and the transparent optical layer 214 at the bottom may generally have a larger thickness, while the transparent optical layer 214 at the top has a minimum thickness.
In other embodiments, the collimating structure for controlling the optical paths of the first optical return signal and the second optical return signal is not limited to the microlens-pin hole structure described in this embodiment, and may be implemented by using a fiber collimator, for example. The microlens and pinhole structures are not necessarily fabricated on a silicon-based substrate, but may be formed on a separate substrate (e.g., glass) and then bonded to the photosensor array. Alternatively, in the embodiment using the optical fiber collimator, the optical fiber collimator may be fabricated in the optical fiber panel and then attached to the photosensitive sensor array.
As can be seen from fig. 3, the photosensor array of the present embodiment adopts a 2 × 2 pixel arrangement, and each of four photosensor units has a first photosensor unit 215 capable of receiving a first light signal or a second photosensor unit 216 capable of receiving a second light signal. Since the first photosensitive sensing units 215 and the second photosensitive sensing units 216 are in one-to-one correspondence with the microlenses 211, the coverage area of each microlens 211 also corresponds to four photosensitive sensing units, and the diameter of the microlens 211 can be set between 10-20 μm. It can also be seen that there are three idle photosensitive sensing units in every four photosensitive sensing units, and the photosensitive sensing unit which does not receive any optical signal due to being shielded by the light shielding layer 213 in fig. 4 is the idle photosensitive sensing unit.
In another embodiment, as shown in fig. 7, a 3 × 3 pixel arrangement may be adopted, where there is one first photosensitive sensing unit 215 (or one second photosensitive sensing unit 216) in every nine photosensitive sensing units, and eight idle photosensitive sensing units, and each first photosensitive sensing unit 215 corresponds to one microlens 211 and one pinhole structure 212.
In further embodiments, the area of each second fingerprint region may be larger, and the distance may be further or closer.
Further, an infrared Filter (IR-Cut Filter, IRCF)217 is disposed above the first photosensitive sensor unit 215 and the second photosensitive sensor unit 216. The infrared filter layer 217 serves to block interference light from the external environment. When external light exists, only light with a wavelength of more than 600nm can penetrate through the finger after the external light passes through the finger, so that the external light is filtered by the infrared filter layer 217 before reaching the first photosensitive sensing unit 215 and the second photosensitive sensing unit 216, and the recognition of the fingerprint image is not influenced. The infrared filter layer 217 is specifically formed by forming a protective layer covering the first and second photosensitive sensing units 215 and 216 with silicon dioxide after the first and second photosensitive sensing units 215 and 216 are formed, and then depositing the infrared filter layer 217 on the surface of the protective layer.
In another embodiment, a metal layer (not shown) may be formed on the first photosensitive sensing unit 215 and the second photosensitive sensing unit 216, and a light hole corresponding to the first photosensitive sensing unit 215 and the second photosensitive sensing unit 216 is formed on the metal layer to realize smaller crosstalk, and the aperture of the light hole may be slightly smaller than the opening of the light shielding layer 213 at the bottom.
As shown in fig. 6, signal lines 220 are further provided in the photosensor array, and every n second photosensor units 216 are connected to the same signal line 220 as a group. Fig. 6 corresponds to the second photosensitive sensing unit 216 showing only the second fingerprint area 202 of fig. 3, and the signal lines 220 connected to the six second photosensitive sensing units 216. After the second light-sensitive sensing unit 216 converts the received second light return signal into an electrical signal, the electrical signal is transmitted to the operation chip by the signal line 220 for fingerprint living body identification. Since the area of the second photo-sensing unit 216 is generally much smaller than one pixel unit in the display panel, six second photo-sensing units 216 shown in fig. 6 correspond to approximately four pixel units.
Since the second light-sensitive sensing unit 216 can only receive the second light return signal with a small angle and approximate perpendicularity, the light receiving amount is small, and the problem that the corresponding position of the second light-sensitive sensing unit 216 is just shielded by the metal driving circuit of the display panel exists. Therefore, the second photosensitive sensor units 216 can be combined by regions, for example, in the embodiment, the second optical return signals received by six second photosensitive sensor units 216 are combined to increase the signal intensity transmitted to the operation chip, so as to ensure that the received signals are sufficient for fingerprint living body identification.
More needs of fingerprint living body identification detect the spectral characteristics, and compared with fingerprint image identification, the fingerprint valley and ridge do not need to be identified with particularly high pixel fineness, so that the second photosensitive sensing unit 216 can be combined according to regions, the signal intensity transmitted to an operation chip is increased, the total number of signal lines 220 can be reduced, and the complexity of wiring in the photosensitive sensor array is reduced. In addition to the embodiment described with six second photosensitive sensing units 216 connected to the same signal line 220 as a group, in other embodiments, eight, nine or more second photosensitive sensing units 216 may be connected as a group, or more second photosensitive sensing units 216 may be connected to the same signal line 220 as a group. That is, as long as the second photosensitive sensing units 216 in one second fingerprint area 202 are not single, the signals can be combined by connecting to the same signal line 220.
The present invention provides a display panel 1, as shown in fig. 2, disposed above a fingerprint identification device, including a first fingerprint area 201 and a second fingerprint area 202; pixel units in the first fingerprint area 201 send out first optical signals, and the first optical signals reach a first photosensitive sensing unit in the fingerprint identification device after being reflected by a finger; the first fingerprint area 201 comprises at least two pixel units, and the color of the first light signal emitted by each pixel unit is the same; the pixel unit in the second fingerprint area 202 sends out a second optical signal, and the second optical signal reaches a second photosensitive sensing unit in the fingerprint identification device after being reflected by the finger; the second fingerprint area 202 includes a plurality of sub-areas, and at least two sub-areas emit second light signals with different colors.
In the display panel 1 provided by the embodiment of the invention, the second fingerprint area 202 includes a plurality of sub-areas, and the sub-areas are discretely distributed in the first fingerprint area 201. The second fingerprint area 202 is divided into a plurality of sub-areas with small areas, and the sub-areas are distributed in the first fingerprint area 201 in a discrete mode, so that the integrity of the first fingerprint area 201 can be damaged as little as possible, and the influence on the fingerprint image identification is reduced. In addition, the second optical return signal received by the second fingerprint area 202 can be used for fingerprint image identification while being used for living body detection.
In this embodiment, each sub-region has a size of 1 pixel unit, and each pixel unit is composed of three sub-pixels of red (R), green (G), and blue (B). The red sub-pixel in the pixel unit in each sub-area emits light; or, the green sub-pixel in the pixel unit in each sub-area emits light; alternatively, the blue sub-pixel in the pixel unit in each sub-area emits light. As can be seen from fig. 2, in the four sub-regions, only the red sub-pixel of one sub-region is lit, only the blue sub-pixel of one sub-region is lit, and only the green sub-pixel of two sub-regions is lit, that is, only monochromatic light of one color is emitted from each sub-region, but monochromatic light of different colors is emitted from different sub-regions. The above is only one implementation manner, and is not limited to monochromatic light, as long as the light emitted by the same sub-region has the same color.
Since the pixel cells in the second fingerprint area 202 generally emit monochromatic light, the overall light signal intensity is low. In order to make the second light-sensitive sensing unit 216 in the fingerprint identification device receive more second light return signals, in other embodiments, the size of each sub-area of the second fingerprint area 202 may be increased to 2 × 2 pixel units or 3 × 3 pixel units. In addition, each sub-region can also emit mixed-color light as long as the color of the second light signal emitted by the pixel units in one sub-region is the same.
In further embodiments, the plurality of sub-areas of the second fingerprint area may not be discrete subdivisions, but may be connected. Alternatively, the second fingerprint area may be disposed outside, inside, or on a side of the first fingerprint area, for example, the ICON area is divided into an inner portion, an outer portion, a left portion, a right portion, or an upper portion and a lower portion, which are respectively used as the second fingerprint area and the first fingerprint area, and the area ratio of the second fingerprint area and the first fingerprint area may be freely allocated according to actual requirements.
In the present embodiment, the light-emitting sub-pixel of each pixel unit of the second fingerprint region 202 is different from the light-emitting sub-pixel of each pixel unit of the first fingerprint region 201. For example, the red sub-pixel, the green sub-pixel, and the blue sub-pixel in the pixel unit of the first fingerprint area 201 emit light, and the emitted first light signal is a mixed red-green-blue light (white light), that is, the sub-pixels of three colors are all turned on, so as to increase the overall intensity of the first light signal.
In another embodiment, the red, green, and blue sub-pixels in the pixel unit within the first fingerprint region emit light (white light); or, the green sub-pixel and the blue sub-pixel in the pixel unit in the first fingerprint area emit light (cyan light); or the green sub-pixel in the pixel unit in the first fingerprint area emits light. Since the service life of the blue sub-pixel is usually the shortest of the three colors, turning off the blue sub-pixel during fingerprint identification is beneficial to prolonging the service life of the blue sub-pixel. It should be noted that, in this embodiment, the pixel units in the first fingerprint area may emit various monochromatic lights, as long as the same color is ensured.
In the embodiment, the first optical signal emitted by the pixel unit in the first fingerprint area is used for fingerprint image identification; and the second optical signals emitted by the pixel units in the second fingerprint area are used for fingerprint living body identification. In a possible implementation, the pixel units in the second fingerprint area are further used for emitting third light signals with the same color as the first light signals emitted by the pixel units in the first fingerprint area; the first optical signal and the third optical signal are both used for fingerprint image identification; and the second optical signals emitted by the pixel units in the second fingerprint area are used for fingerprint living body detection.
For example, in the first frame for fingerprint image recognition, the color of the third optical signal emitted by the pixel unit in the second fingerprint area is the same as the color of the first optical signal, which is equivalent to that the first optical signal is emitted by the ICON area as a whole, and the first photosensitive sensing unit and the second photosensitive sensing unit respectively receive the first optical return signal and the third optical return signal, which are equivalent to that the first optical return signal is received, so as to perform fingerprint image recognition. In a second frame for fingerprint living body identification, the first fingerprint area does not emit light, only the second fingerprint area emits a second light signal, and only the second photosensitive sensing unit receives the second light signal.
In a possible embodiment, the color of the second light signal emitted by at least one sub-area in the second fingerprint area is different in the first and second fingerprint liveness detections. For example, two preset images can be preset for the ICON area, in the first fingerprint living body detection, according to the first preset image, the first fingerprint area emits blue-green mixed light, and the second fingerprint area respectively emits red monochromatic light, green monochromatic light and blue monochromatic light. In the second fingerprint living body detection, according to a second preset image, the first fingerprint area emits green monochromatic light, the second fingerprint area which emits red monochromatic light at the last time is changed to emit blue monochromatic light, the second fingerprint area which emits green monochromatic light at the last time is changed to emit red monochromatic light, and the second fingerprint area which emits blue monochromatic light at the last time is changed to emit green monochromatic light. By analogy, the two imaging modes are repeatedly switched in each continuous fingerprint living body detection, so that the pixel unit is prevented from always keeping a color state, and the screen is prevented from being aged.
Further, in the first and second biopsy, the position and/or number of at least one sub-area in the second fingerprint area is changed. For example, in the previous fingerprint living body detection, the plurality of sub-areas in the second fingerprint area are discretely distributed in the first fingerprint area, the first fingerprint area emits the first optical signal, and the second fingerprint area emits the second optical signal. In the later fingerprint living body detection, the number of the plurality of sub-areas in the second fingerprint area is increased, and the plurality of sub-areas are changed from the original discrete state to be communicated with each other.
Further, in the first and second biopsy, pixel units in at least one sub-area in the second fingerprint area are converted into pixel units in the first fingerprint area; and/or pixel cells in a partial region in the first fingerprint region are transformed into pixel cells in at least one sub-region in the second fingerprint region. For example, in the former live detection, some of the pixel units are in the first fingerprint area, and in the latter live detection, some of the pixel units are in the second fingerprint area; still other pixel cells are in the second fingerprint area in a previous liveness check and in the first fingerprint area in a subsequent liveness check.
The embodiment of the invention also provides a touch device, which can be a mobile phone, a tablet computer and other touch devices, and is particularly suitable for a full-screen mobile phone.
The embodiment of the invention also provides a fingerprint identification method applied to the touch equipment, which comprises the following steps:
s1: and controlling the pixel units in the first fingerprint area to send out first optical signals, and controlling the pixel units in the second fingerprint area to send out second optical signals.
The first fingerprint area comprises at least two pixel units, and the color of a first light signal emitted by each pixel unit is the same; the second fingerprint area comprises a plurality of sub-areas, and the colors of the second light signals emitted by at least two sub-areas are different.
All pixel cells of the display panel can be lighted at this time, for example, when the OLED display panel displays normally. Alternatively, only the pixel units in the first fingerprint area may be controlled to emit the first light signal, for example, when the display panel is in a black screen state; and simultaneously, controlling the pixel units of the second fingerprint area to emit second optical signals.
S2: a first light return signal for fingerprint image recognition is acquired through the first photosensitive sensing unit, and a second light return signal for fingerprint living body recognition is acquired through the second photosensitive sensing unit.
The first light return signal is formed by a light signal which is emitted by the first fingerprint area and reflected by the finger and is used for fingerprint image identification. The second optical return signal is formed by an optical signal which is emitted by the second fingerprint area and reflected by the finger, and is used for fingerprint living body identification.
Because the touch device and the fingerprint identification method provided by the embodiment of the invention comprise all technical characteristics of the display panel provided by the embodiment, the same technical problems can be solved, and the same technical effects can be achieved.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (21)
1. The fingerprint identification device is characterized by being arranged below a display panel, wherein the display panel comprises a first fingerprint area and a second fingerprint area; the first fingerprint area comprises at least two pixel units, and the color of a first light signal emitted by each pixel unit is the same; the second fingerprint area comprises a plurality of sub-areas, and the colors of second optical signals emitted by at least two sub-areas are different;
the fingerprint identification device comprises a first photosensitive sensing unit and a second photosensitive sensing unit;
the first photosensitive sensing unit is used for receiving a first optical return signal, and the first optical return signal is formed by an optical signal which is emitted by the first fingerprint area and is reflected by a finger;
the second photosensitive sensing unit is used for receiving a second light return signal, and the second light return signal is formed by a light signal which is emitted by the second fingerprint area and is reflected by a finger.
2. The fingerprint recognition device of claim 1, wherein the fingerprint recognition device comprises a photosensitive sensor array and a collimating optical structure in sequence from bottom to top;
the photosensitive sensor array comprises a silicon-based substrate, and a plurality of first photosensitive sensing units and a plurality of second photosensitive sensing units which are formed on the silicon-based substrate;
the first optical return signal reaches the first photosensitive sensing cell through the collimating optical structure;
the second optical return signal passes through the collimating optical structure to the second light-sensitive sensing unit.
3. The fingerprint recognition device of claim 2, wherein the collimating optical structure comprises a microlens layer and at least one light shielding layer; the micro-lens layer comprises a plurality of micro-lenses, and a plurality of pinhole structures are formed in the light shielding layer;
the first optical return signal reaches the first photosensitive sensing unit through the micro-lens and the pinhole structure;
the second optical return signal reaches the second light-sensitive sensing unit through the micro-lens and the pinhole structure.
4. The fingerprint identification device of claim 3, wherein the light shielding layer is a plurality of layers;
a transparent optical layer is filled between two adjacent light shielding layers; the microlens layer is arranged above the light shielding layer, and a transparent optical layer is filled between the uppermost light shielding layer and the microlens layer.
5. The fingerprint recognition device according to claim 2, wherein an infrared filter layer is provided above the first photosensitive sensor unit and the second photosensitive sensor unit.
6. The fingerprint identification device of claim 2, wherein a metal layer is formed on the first photosensitive sensor unit and the second photosensitive sensor unit, and the metal layer is provided with light holes corresponding to the first photosensitive sensor unit and the second photosensitive sensor unit.
7. The fingerprint recognition device of claim 2, wherein the photosensitive sensor array has signal lines disposed therein;
every n second photosensitive sensing units are connected to the same signal line as a group.
8. The display panel is arranged above a fingerprint identification device and comprises a first fingerprint area and a second fingerprint area;
the pixel unit in the first fingerprint area sends out a first optical signal, and the first optical signal reaches a first photosensitive sensing unit in the fingerprint identification device after being reflected by a finger; the first fingerprint area comprises at least two pixel units, and the color of a first light signal emitted by each pixel unit is the same;
the pixel unit in the second fingerprint area sends out a second optical signal, and the second optical signal reaches a second photosensitive sensing unit in the fingerprint identification device after being reflected by a finger; the second fingerprint area comprises a plurality of sub-areas, and the colors of the second light signals emitted by at least two sub-areas are different.
9. The display panel according to claim 8, wherein the second fingerprint area is provided outside or inside the first fingerprint area.
10. The display panel of claim 8, wherein a plurality of sub-regions of the second fingerprint region are in communication.
11. The display panel of claim 8, wherein the plurality of sub-regions of the second fingerprint region are distributed in a discrete manner.
12. The display panel of claim 8, wherein each of the sub-regions is 1 pixel unit, 2 x 2 pixel units, or 3 x 3 pixel units in size.
13. The display panel according to claim 8, wherein the red, green and blue sub-pixels in the pixel unit in the first fingerprint region emit light; or the green sub-pixel and the blue sub-pixel in the pixel unit in the first fingerprint area emit light; or the green sub-pixel in the pixel unit in the first fingerprint area emits light.
14. The display panel according to claim 8, wherein the red sub-pixel in the pixel unit in each of the sub-regions emits light; or, the green sub-pixel in the pixel unit in each sub-area emits light; alternatively, the blue sub-pixel in the pixel unit in each of the sub-regions emits light.
15. The display panel according to claim 8, wherein the first light signal emitted by the pixel unit in the first fingerprint area is used for fingerprint image recognition; and the second optical signal emitted by the pixel unit in the second fingerprint area is used for fingerprint living body identification.
16. The display panel of claim 8, wherein the pixel cells in the second fingerprint region are further configured to emit a third light signal having a same color as the first light signal emitted by the pixel cells in the first fingerprint region; the first optical signal and the third optical signal are both used for fingerprint image identification; and the second optical signals emitted by the pixel units in the second fingerprint area are used for fingerprint living body detection.
17. The display panel of claim 8, wherein the color of the second light signal emitted from at least one sub-area of the second fingerprint area is different between the first and second biopsy examinations.
18. The display panel according to claim 8, wherein the position and/or number of at least one sub-area in the second fingerprint area changes in the first and second biopsy tests.
19. The display panel according to claim 8, wherein in the first and second biopsy, the pixel cells in at least one sub-area in the second fingerprint area are changed to the pixel cells in the first fingerprint area; and/or pixel cells in a partial region in the first fingerprint region are transformed into pixel cells in at least one sub-region in the second fingerprint region.
20. An apparatus comprising the fingerprint recognition device according to any one of claims 1 to 7 and the display panel according to any one of claims 8 to 19.
21. A fingerprint recognition method applied to the apparatus of claim 20, the method comprising:
controlling the pixel units of the first fingerprint area to emit first optical signals, and controlling the pixel units of the second fingerprint area to emit second optical signals;
the first light return signal used for fingerprint image recognition is acquired through the first photosensitive sensing unit, the second light return signal used for fingerprint living body recognition is acquired through the second photosensitive sensing unit, the first light return signal is formed by a light signal which is emitted by the first fingerprint area and reflected by a finger, and the second light return signal is formed by a light signal which is emitted by the second fingerprint area and reflected by the finger.
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| CN202010145557.XA CN111291719A (en) | 2020-03-03 | 2020-03-03 | Fingerprint identification device, display panel, equipment and fingerprint identification method |
| PCT/CN2020/119460 WO2021174842A1 (en) | 2020-03-03 | 2020-09-30 | Fingerprint recognition apparatus, display panel, device, and fingerprint recognition method |
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| CN202010145557.XA CN111291719A (en) | 2020-03-03 | 2020-03-03 | Fingerprint identification device, display panel, equipment and fingerprint identification method |
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