WO2021174842A1

WO2021174842A1 - Fingerprint recognition apparatus, display panel, device, and fingerprint recognition method

Info

Publication number: WO2021174842A1
Application number: PCT/CN2020/119460
Authority: WO
Inventors: 王海生; 梁嘉骏; 黄怡菲
Original assignee: 北京迈格威科技有限公司
Priority date: 2020-03-03
Filing date: 2020-09-30
Publication date: 2021-09-10
Also published as: CN111291719A

Abstract

The present invention relates to the technical field of display terminals, and provides a fingerprint recognition apparatus, a display panel, a device, and a fingerprint recognition method. The fingerprint recognition apparatus is provided below the display panel, and the display panel comprises a first fingerprint region and a second fingerprint region; the first fingerprint region comprises at least two pixel units, and the color of a first optical signal emitted by each of the pixel units is the same; the second fingerprint region comprises a plurality of subregions, and the colors of second optical signals emitted by at least two subregions are different; the fingerprint recognition apparatus comprises a first photosensitive sensing unit and a second photosensitive sensing unit; the first photosensitive sensing unit is configured to receive a first optical return signal; the second photosensitive sensing unit is configured to receive a second optical return signal. The present invention mitigates the technical problems of a complicated manufacturing process and high manufacturing cost of the existing living fingerprint recognition technology.

Description

Fingerprint identification device, display panel, equipment and fingerprint identification method

Cross-references to related applications

This disclosure claims the priority of a Chinese patent application filed with the China Patent Office on March 3, 2020, with the application number CN202010145557.X and the name "fingerprint identification device, display panel, equipment, and fingerprint identification method", and the entire content of it is approved Reference is incorporated in this disclosure.

Technical field

The present disclosure relates to the technical field of display terminals, and in particular to a fingerprint identification device, a display panel, equipment, and a fingerprint identification method.

Background technique

Full screen is the mainstream configuration of current mobile phones, and the use of full screen mobile phones also makes under-screen fingerprint recognition technology a popular research direction. After long-term development, the under-screen fingerprint recognition technology has become more mature in fingerprint image recognition.

At present, consumers have put forward higher requirements for fingerprint recognition technology, that is, a live fingerprint detection function is required to determine whether the collected fingerprint image originates from a real finger or a fake finger. However, no effective and low-cost solution has been found to solve the above-mentioned problems.

Summary of the invention

The purpose of the present disclosure includes, for example, providing a fingerprint identification device, a display panel, a device, and a fingerprint identification method, so as to, for example, alleviate the technical problems of complicated production process and high production cost of the existing living fingerprint identification technology.

The embodiment of the present disclosure provides a fingerprint identification device, which is arranged below a display panel. The display panel includes a first fingerprint area and a second fingerprint area; the first fingerprint area includes at least two pixel units, and each pixel unit emits a first fingerprint. The color of the light signal is the same; the second fingerprint area includes a plurality of sub-areas, and the colors of the second light signals emitted by at least two sub-areas are different; the fingerprint identification device includes a first photosensitive sensing unit and a second photosensitive sensing unit; The photosensitive sensing unit is configured to receive the first light return signal, the first light return signal is formed by the light signal of the first light signal emitted by the first fingerprint area after being reflected by the finger; the second photosensitive sensing unit is configured to receive the second light The return signal, the second light return signal is formed by the light signal of the second light signal emitted by the second fingerprint area after being reflected by the finger.

Optionally, the fingerprint identification device includes a photosensitive sensor array and a light guiding structure in order from bottom to top; the photosensitive sensor array includes a silicon-based substrate and a plurality of first photosensitive sensing units and a plurality of second photosensitive cells formed on the silicon-based substrate. Sensing unit; the first light return signal reaches the first photosensitive sensing unit through the light guide structure; the second light return signal reaches the second photosensitive sensing unit through the light guide structure.

Optionally, the light guiding structure includes a microlens layer and at least one light-shielding layer; the microlens layer includes a plurality of microlenses, and a plurality of pinhole structures are formed in the light-shielding layer; the first light return signal passes through the microlenses and the pinhole structure Reach the first photosensitive sensing unit; the second light return signal reaches the second photosensitive sensing unit through the microlens and pinhole structure.

Optionally, the light-shielding layer is a multilayer; 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 .

Optionally, an infrared filter layer is provided above the first photosensitive sensor unit and the second photosensitive sensor unit.

Optionally, a metal layer is formed on the first photosensitive sensing unit and the second photosensitive sensing unit, and the metal layer is provided with light-transmitting holes corresponding to the positions of the first photosensitive sensing unit and the second photosensitive sensing unit.

Optionally, a signal line is provided in the photosensitive sensor array; every n second photosensitive sensor units are connected to the same signal line as a group.

Optionally, an embodiment of the present disclosure provides a display panel, which is arranged above the fingerprint identification device and includes a first fingerprint area and a second fingerprint area; the pixel unit in the first fingerprint area emits a first light signal, and the first light After the signal is reflected by the finger, it reaches the first photosensitive sensing unit in the fingerprint identification device; the first fingerprint area includes at least two pixel units, and the color of the first light signal emitted by each pixel unit is the same; The pixel unit emits a second light signal, and the second light signal reaches the second photosensitive sensing unit in the fingerprint identification device after being reflected by the finger; the second fingerprint area includes a plurality of sub-areas, and at least two sub-areas emit second light signals The colors are different.

Optionally, the second fingerprint area is provided outside or inside the first fingerprint area.

Optionally, multiple sub-areas of the second fingerprint area are connected.

Optionally, multiple sub-regions of the second fingerprint region are distributed in a discrete manner.

Optionally, the size of each sub-region is 1 pixel unit, 2×2 pixel units, or 3×3 pixel units.

Optionally, red sub-pixels, green sub-pixels, and blue sub-pixels in pixel units in the first fingerprint area emit light; or, green sub-pixels and blue sub-pixels in pixel units in the first fingerprint area emit light; Or, the green sub-pixel in the pixel unit in the first fingerprint area emits light.

Optionally, red sub-pixels in pixel units in one or more sub-regions emit light; or, green sub-pixels in pixel units in one or more sub-regions emit light; or, in pixel units in one or more sub-regions The blue sub-pixels emit light.

Optionally, the first light signal emitted by the pixel unit in the first fingerprint area is used for fingerprint image recognition; the second light signal emitted by the pixel unit in the second fingerprint area is used for fingerprint identification in vivo.

Optionally, the pixel unit in the second fingerprint area is further configured to emit a third light signal with the same color as the first light signal emitted by the pixel unit in the first fingerprint area; both the first light signal and the third light signal are used For fingerprint image recognition; the second light signal emitted by the pixel unit in the second fingerprint area is used for fingerprint live detection.

Optionally, 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 biological detections.

Optionally, the position and/or number of at least one sub-areas in the second fingerprint area changes in the two live detections of the previous and the next.

Optionally, in the two previous and next live detections, the pixel unit that was divided in at least one sub-region in the second fingerprint area in the previous fingerprint live detection is divided in the next fingerprint live detection The pixel unit in the first fingerprint area; and/or the pixel unit in the partial area of the first fingerprint area that was divided in the previous fingerprint living detection was divided into the second fingerprint area in the next fingerprint living detection Pixel unit in at least one of the sub-regions.

An embodiment of the present disclosure provides a device including the above-mentioned fingerprint identification device and the above-mentioned display panel.

The embodiment of the present disclosure provides a fingerprint identification method, which is applied to the above-mentioned device. The method includes: controlling a pixel unit in a first fingerprint area to emit a first light signal, and controlling a pixel unit in a second fingerprint area to emit a second light signal; A photosensitive sensor unit acquires the first light return signal for fingerprint image recognition, and the second light sensor unit acquires the second light return signal for fingerprint biometric identification. The first light return signal is emitted by the first fingerprint area. The first optical signal is formed by the optical signal reflected by the finger, and the second optical return signal is formed by the optical signal after the second optical signal emitted by the second fingerprint area is reflected by the finger.

The fingerprint identification device provided by the embodiment of the present disclosure may be arranged under the display panel, and the ICON area of the display panel includes a first fingerprint area and a second fingerprint area. When the finger is pressed in the ICON area to perform fingerprint recognition, each pixel unit in the first fingerprint area emits a first light signal, and the first light signal is reflected by the finger to form a first light return signal, which is determined by the first light signal in the fingerprint recognition device. A photosensitive sensor unit is used for fingerprint image recognition. The second fingerprint area emits a second light signal, and the second light signal is reflected by the finger to form a second light return signal, which is received by the second photosensitive sensor unit in the fingerprint identification device for fingerprint identification. Because the colors of the second light signals emitted by at least two sub-areas of the second fingerprint area are different, the second light return signal received by the second photosensitive sensor unit also includes at least two different colors, which can be used to compare different colors with fingers. The difference in the absorption characteristics of the optical signal determines whether the finger is a real finger or a fake finger, and realizes the live detection of the finger. Therefore, in the fingerprint identification device provided by the embodiments of the present disclosure, the function of living fingerprint detection can be realized without additional red, green, and blue filter films, thereby alleviating the complexity of the prior art manufacturing process and the relatively high manufacturing cost. High technical issues.

Description of the drawings

In order to more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the specific embodiments or the description of the prior art. Obviously, the appendix in the following description The drawings are some embodiments of the present disclosure. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings.

FIG. 1 is a schematic diagram of a display panel provided by an embodiment of the disclosure;

2 is a schematic diagram of a pixel unit in an ICON area in an embodiment of the disclosure;

3 is a schematic partial plan view of a display panel provided by an embodiment of the disclosure;

4 is a schematic partial cross-sectional view of a display panel provided by an embodiment of the disclosure;

FIG. 5 is a schematic diagram of the received spectral intensity of the second photosensitive sensing unit in an embodiment of the disclosure;

FIG. 6 is a schematic diagram of the connection relationship of signal lines in an embodiment of the disclosure;

FIG. 7 is a schematic partial plan view of another embodiment of a display panel provided by an embodiment of the present disclosure.

Detailed ways

The technical solutions of the present disclosure will be clearly and completely described below in conjunction with embodiments. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present disclosure.

The embodiments of the present disclosure provide a display panel, which can be applied to touch terminals such as mobile phones and tablet computers, and is particularly suitable for full-screen mobile phones, and can alleviate the technical problems of complicated production process and high production cost of the existing living fingerprint identification technology.

As shown in FIGS. 1 to 4, embodiments of the present disclosure provide a fingerprint identification device 2 and a display panel 1. The fingerprint identification device 2 can be disposed under 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 identification device 2 can be fixed by a frame-attached gasket, and the middle can be filled with air or a low-refractive index material. In this embodiment, an OLED display panel is taken as an example for description. The OLED display panel is usually composed of cover glass (Cover Glass) 11, polarizer and touch panel (POL&Touch) 12, encapsulation layer (Encapsulation) 13, light-emitting layer 14 and corresponding controls. The circuit (not shown in the figure) and/or the back plate 15 are constituted.

The display panel 1 may include a first fingerprint area 201 and a second fingerprint area 202, and these two areas form an ICON area 200 configured to identify fingerprints, that is, an area pressed by a finger when identifying a fingerprint. The first fingerprint area 201 may include at least two pixel units, and the color of the first light signal emitted by each pixel unit may be the same; the second fingerprint area 202 may include multiple sub-areas, and at least two sub-areas emit second light signals. The color can be different.

The fingerprint recognition device 2 may include a first photosensitive sensing unit 215 and a second photosensitive sensing unit 216. The first photosensitive sensing unit 215 may be substantially aligned with the first fingerprint area 201 in the vertical direction, and the second photosensitive sensing unit 216 may be substantially aligned with the second fingerprint area 202 in the vertical direction; first The photosensitive sensing unit 215 is configured to receive a first light return signal, which is formed by the first light signal emitted by the first fingerprint area 201 after being reflected by the finger; the second photosensitive sensing unit 216 is configured to receive The second light return signal, the second light return signal is formed by the second light signal emitted by the second fingerprint area 202 after being reflected by the finger.

When the touch device performs fingerprint recognition, the pixel unit located in the light-emitting layer 14 in the first fingerprint area 201 emits a first light signal, and the first light signal is reflected by the finger to form a first light return signal, and the first light return signal reaches the fingerprint The first photosensitive sensing unit 215 in the identification device 2; in each pixel unit of the first fingerprint area 201, sub-pixels of several colors emit light, so that the first light signal is mixed color light of the same color, or each Only the sub-pixels of a certain color in the pixel unit emit light, so that the first light signal is monochromatic light of the same color, that is, the same color of the first light signal here means that the color of the first signal is a uniform combination of colors Mixed-color light or monochromatic light of the same color type. 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, then the first light signal is the mixed color light (mixed light) composed of three colors of red, green, and blue. Then it is white); another example is that in each pixel unit of the first fingerprint area 201, only the green sub-pixel and the blue sub-pixel emit light, then the first light signal is the mixed color light composed of green and blue (the mixed color is cyan ); If only green sub-pixels emit light in each pixel unit of the first fingerprint area 201, then the first light signal is green monochromatic light. That is, mixed color light refers to a light signal formed by mixing sub-pixels of at least two colors that emit light at the same time in a pixel unit. Monochromatic light refers to a single light signal formed by only one sub-pixel in a pixel unit emitting light.

The pixel unit located in the light-emitting layer 14 in the second fingerprint area 202 emits a second light signal, and the second light signal is reflected by the finger to form a second light return signal, and the second light return signal reaches the second photosensitive transmission in the fingerprint identification device 2感unit 216. The second fingerprint area 202 includes a plurality of sub-areas, and the colors of the second light signals emitted by the at least two sub-areas are different, that is, in each pixel unit of the at least two sub-areas of the second fingerprint area 202, there are several colors in different combinations All sub-pixels emit light, so that the second light signals formed by different sub-regions are mixed-color light of different colors, or in each pixel unit of at least two sub-regions, sub-pixels of a different color emit light, so that different sub-regions emit light. The formed second light signal is monochromatic light with different colors, that is, the color of the second light signal is different means that the color of the second signal is mixed color light with different color combinations or monochromatic light with different color types. When each sub-region has multiple pixel units, the color of the second light signal formed by each pixel unit in one or more sub-regions can be the same, that is, the second light signal can be a unified combination of colors in one or more sub-regions Mixed-color light or monochromatic light of the same color type.

In the embodiment of the present disclosure, the first light-sensitive sensing unit 215 is used to receive the first light return signal to identify the fingerprint image; the second light-sensitive sensing unit 216 is used to receive the second light return signal to identify the fingerprint living body. Because the color of the second light signal formed by each pixel unit in the at least two sub-areas of the second fingerprint area 202 is different, the second light return signal received by the second photosensitive sensing unit 216 also includes at least two different colors Therefore, the difference in the absorption characteristics of the light of different colors can be used to determine whether the finger is a real finger or a fake finger, and the living body detection of the finger can be realized. Therefore, the fingerprint identification device provided by the embodiments of the present disclosure can realize the function of living fingerprint detection, thereby alleviating the technical problems of complicated manufacturing process and high manufacturing cost in the prior art.

The fingerprint identification device provided in this embodiment may include a photosensitive sensor array and a light guide structure in order from bottom to top. As shown in FIGS. 3 and 4, the photosensitive sensor array may include a silicon-based substrate 210, and a plurality of first photosensitive sensing units 215 and a plurality of second photosensitive sensing units 216 formed on the silicon-based substrate 210, The first photosensitive sensing unit 215 and the second photosensitive sensing unit 216 may be formed on the silicon-based substrate 210 through a patterning process. The first light return signal reaches the first photosensitive sensor unit 215 through the light guide structure; the second light return signal reaches the second photosensitive sensor unit 216 through the light guide structure.

The light guiding structure provided in this embodiment may include at least one light shielding layer 213 and a micro lens layer. A plurality of pinhole structures 212 may be formed in the light shielding layer 213, and the microlens layer may include a plurality of microlenses 211. The first light return signal reaches the first photosensitive sensing unit 215 through the microlens 211 and the pinhole structure 212; the second light return signal reaches the second photosensitive sensing unit 216 through the microlens 211 and the pinhole structure 212.

The first light return signal or the second light return signal from the finger direction is first focused by the microlens 211, and then enters the first photosensitive sensing unit 215 or the second photosensitive sensing unit 216 through the pinhole structure 212. Through the microlens 211 and the pinhole structure 212, the first light return signal or the second light return signal can be injected into the first photosensitive sensor unit 215 or the second photosensitive sensor unit 216 in a nearly vertical direction, and the first light returns The angle of the angle formed by the propagation direction of the signal or the second light return signal and the vertical direction can be about ±2°, so that the light signal can be accurately acquired, and the distance between the finger and the first photosensitive sensor unit 215 or the second photosensitive sensor unit 215 can be prevented. The photosensitive sensing unit 216 is relatively far away, which causes a light mixing problem.

In practical applications, since there is also a distance of nearly 1mm between the pixel unit in the display panel and the finger, in the second fingerprint area 202, for example, the light emitted by the red pixel and the blue pixel next to the green pixel may also reach The green pixel corresponds to the position of the finger, and its spectral distribution is shown in Fig. 5. However, relying on the characteristic of the second photosensitive sensor unit 216 to receive the second light return signal that is approximately vertical, relatively more green light information signals can be received. . In an embodiment provided by the present disclosure, the second light signal (the second light return signal) includes red monochromatic light, blue monochromatic light, and green monochromatic light, and the inclusion of three types of monochromatic light makes it possible to rely on real fingers. The difference in the absorption characteristics of red light, green light, and blue light from the fake finger can be used to determine the authenticity of the finger. It can also be combined with the fingerprint algorithm of deep learning to more accurately distinguish the true and false of the finger.

In an embodiment provided by the present disclosure, the light-shielding layer 213 may be multiple layers, a transparent optical layer 214 may be filled between two adjacent light-shielding layers 213, and the microlens layer may be provided above the uppermost light-shielding layer 213, A transparent optical layer 214 may also be filled between the uppermost light shielding layer 213 and the micro lens layer. In the embodiment provided in the present disclosure, the light shielding layer 213 may be three layers, and the light shielding layer 213 may be formed of an organic resin material. Each light shielding layer 213 may be provided with openings, and the closer to the aperture of the photosensitive sensor array The smaller, the three openings in the same vertical direction form the pinhole structure 212.

Optionally, the aperture of the opening in the light-shielding layer 213 closer to the photosensitive 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 becomes gradually smaller. The light shielding layer 213 is used to filter the light signal layer by layer to shield the light signal with an oblique angle, so that the light signal received by the first photosensitive sensing unit 215 and the second photosensitive sensing unit 216 is closer to the vertical direction. In an embodiment of the present disclosure, the aperture in the light-shielding layer 213 closest to the photosensitive sensor array may have an aperture of 2-3 μm. As it gets farther and farther away from the photosensitive sensor array, the aperture gradually increases. The aperture in the light-shielding layer 213 may be within 10 μm.

In addition, according to the degree of influence of the transparent optical layer 214 at different heights on the crosstalk phenomenon, each layer of the transparent optical layer 214 can be set to a different thickness, and the transparent optical layer 214 at the bottom can usually be made to have a larger thickness. The thickness of the transparent optical layer 214 on the top can be the smallest.

In other embodiments of the present disclosure, the guiding structure configured to control the optical path of the first light return signal and the second light return signal is not limited to the microlens plus pinhole structure described in this embodiment, for example, an optical fiber guide may also be used accomplish. The microlens and the pinhole structure are not necessarily all made on a silicon-based substrate, but can also be formed on a separate substrate (such as glass), and finally bonded with the photosensitive sensor array. Or, in an embodiment adopting the optical fiber guide, the optical fiber guide may be fabricated in the optical fiber panel, and then bonded to the photosensitive sensor array.

It can be seen from FIG. 3 that the photosensitive sensor array of this embodiment adopts a 2×2 pixel arrangement, and in the first fingerprint area 201, every four photosensitive sensor units have a first optical signal that can receive the first light signal. One photosensitive sensor unit 215, or every four photosensitive sensor units in the second fingerprint area 202, there is one second photosensitive sensor unit 216 that can receive the second light signal. Because the first photosensitive sensing unit 215, the second photosensitive sensing unit 216 and the microlens 211 are in a one-to-one correspondence, the first photosensitive sensing unit 215 that can receive the first light signal in every four photosensitive sensing units Or the second photosensitive sensing unit 216 that can receive the second light signal is substantially inscribed in the projection area of each microlens 211 in the vertical direction or slightly smaller than the projection area of each microlens 211 in the vertical direction, The diameter of the micro lens 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. The photosensitive sensing unit that has not received any light signal because of being blocked by the light shielding layer 213 in FIG. 4 is the idle photosensitive sensing unit. Sense unit.

As shown in FIG. 7, in another embodiment of the present disclosure, an arrangement of 3×3 pixels may also be used, and in every nine photosensitive sensing units, there is a first photosensitive sensor that can receive the first light signal. Sensing unit 215 (or a second photosensitive sensing unit 216 that can receive the second light signal), and eight idle photosensitive sensing units, each corresponding to the first photosensitive sensing unit 215 that can receive the first light signal One microlens 211 and one pinhole structure 212.

In other embodiments of the present disclosure, the area of each second fingerprint area may also be larger, and the separation distance may be farther or closer.

Optionally, an infrared filter layer (IR-Cut Filter, IRCF) 217 is provided above the first photosensitive sensing unit 215 and the second photosensitive sensing unit 216. The infrared filter layer 217 is configured to block interference light from the external environment. When there is external light, because the external light is irradiated on the finger, only light with a wavelength above 600nm can pass through the finger, so the external light is blocked before reaching the first photosensitive sensing unit 215 and the second photosensitive sensing unit 216. The infrared filter layer 217 is filtered out and will not affect the recognition of the fingerprint image. The infrared filter layer 217 is specifically formed as follows: after the first photosensitive sensor unit 215 and the second photosensitive sensor unit 216 are formed, silicon dioxide is used to form a layer covering the first photosensitive sensor unit 215 and the second photosensitive sensor unit 215. The protective layer of the sensing unit 216 is then deposited to form an infrared filter layer 217 on the surface of the protective layer.

In another embodiment of the present disclosure, a metal layer (not shown in the figure) may be formed on the first photosensitive sensor unit 215 and the second photosensitive sensor unit 216, and the metal layer is provided with the first photosensitive sensor unit. The light-transmitting holes corresponding to the positions of the unit 215 and the second photosensitive sensing unit 216 can achieve smaller crosstalk. The aperture of the light-transmitting holes may be slightly smaller than the openings on the light-shielding layer 213 at the bottom.

As shown in FIG. 6, a signal line 220 may also be provided in the photosensitive sensor array, and every n second photosensitive sensor units 216 are connected to the same signal line 220 as a group. FIG. 6 is equivalent to only showing the second photosensitive sensing unit 216 of the second fingerprint area 202 in FIG. 3 and the signal lines 220 connected to the six second photosensitive sensing units 216. After the second photosensitive sensing unit 216 converts the received second light return signal into an electrical signal, the signal line 220 transmits the electrical signal to the arithmetic chip to perform fingerprint biometric identification. Because the area of the second photosensitive sensing unit 216 is generally much smaller than one pixel unit in the display panel, the six second photosensitive sensing units 216 shown in FIG. 6 approximately correspond to four pixel units.

Since the second photosensitive sensor unit 216 can only receive the second light return signal whose propagation direction and the vertical direction are at a small angle, that is, approximately perpendicular, the amount of light received is relatively small, and there may also be a position corresponding to the second photosensitive sensor unit 216. It is blocked by the metal drive circuit of the display panel. Therefore, the second light-sensitive sensing unit 216 can be combined by region. For example, in the embodiment of the present disclosure, the second light return signals received by the six second light-sensitive sensing units 216 are combined to increase the transmission to the computing chip. Signal strength to ensure that the received signal is sufficient for fingerprint live identification.

Fingerprint in vivo recognition requires more detection of spectral features. Compared with fingerprint image recognition, it does not require particularly high pixel fineness to identify the valleys and ridges of the fingerprint. Therefore, the second photosensitive sensing unit 216 can be combined by region. , Increase the signal strength transmitted to the arithmetic chip, and at the same time can reduce the total number of signal lines 220, and reduce the complexity of wiring in the photosensitive sensor array. In addition to connecting the six second photosensitive sensing units 216 as a group to the same signal line 220 described in the embodiment of the present disclosure, in other embodiments, every eight, nine or more second photosensitive sensing units may also be connected to the same signal line 220. The sensing unit 216 is used as a group, or more second photosensitive sensing units 216 are connected to the same signal line 220 as a group. That is, as long as the second photosensitive sensing unit 216 in one second fingerprint area 202 is not a single one, multiple second photosensitive sensing units 216 can be connected to the same signal line 220 for signal combination.

The embodiment of the present disclosure provides a display panel 1, as shown in FIG. 2, which is arranged above the fingerprint identification device, and includes a first fingerprint area 201 and a second fingerprint area 202; the pixel unit in the first fingerprint area 201 emits a second fingerprint area A light signal. After the first light signal is reflected by the finger, it reaches the first photosensitive sensing unit in the fingerprint identification device; the first fingerprint area 201 includes at least two pixel units, and the color of the first light signal emitted by each pixel unit The same; the pixel unit in the second fingerprint area 202 emits a second light signal, and the second light signal is reflected by the finger and reaches the second photosensitive sensing unit in the fingerprint identification device; the second fingerprint area 202 includes a plurality of sub-areas, The colors of the second light signals emitted by at least two sub-regions are different.

In the display panel 1 provided by the embodiment of the present disclosure, the second fingerprint area 202 includes a plurality of sub-areas, and the plurality of sub-areas are discretely distributed in the first fingerprint area 201. Dividing the second fingerprint area 202 into a plurality of sub-areas with a small area, which are distributed in the first fingerprint area 201 in a discrete manner, can damage the integrity of the first fingerprint area 201 as little as possible, thereby reducing the impact on the fingerprint image. Identify the impact. In addition, the second light return signal received by the second fingerprint area 202 can be used for fingerprint image recognition while being used for living body detection.

In the embodiment of the present disclosure, the size of each sub-region is 1 pixel unit, and each pixel unit is composed of three sub-pixels of red (R), green (G), and blue (B). Red sub-pixels in pixel units in one or more sub-regions emit light; or, green sub-pixels in pixel units in one or more sub-regions emit light; or, blue sub-pixels in pixel units in one or more sub-regions The pixels emit light. According to Figure 2, in the four sub-regions, only the red sub-pixel in the pixel unit of one sub-region is lit, and only the blue sub-pixel in the pixel unit of one sub-region is lit. The pixel units in the two sub-regions are lit. Only the green sub-pixels in each sub-area are lit, which means that each sub-area emits only one color of monochromatic light, but the sub-pixels of different colors in at least two different sub-area are lit to emit different colors respectively. monochromatic light. The above is only an implementation manner and is not limited to monochromatic light, as long as the color of the light emitted by the pixel units of the sub-areas of the first fingerprint area is the same, and at least two sub-areas in the sub-areas of the second fingerprint area The color of the light emitted by the pixel unit can be different.

Because the pixel units in the second fingerprint area 202 usually emit monochromatic light, the overall light signal intensity is low. In order to enable the second photosensitive sensing unit 216 in the fingerprint identification device to receive more second light return signals, in other embodiments of the present disclosure, the size of each sub-area of the second fingerprint area 202 may also be changed Increase 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 light formed by the pixel units of each sub-region of the first fingerprint region 201 is the same, and the color of the light formed by the pixel units of at least two sub-regions of the second fingerprint region 202 Just be different.

In more embodiments of the present disclosure, the multiple sub-regions of the second fingerprint region may not be discrete sections, but connected. Alternatively, the second fingerprint area can also be located outside, inside or on the side of the first fingerprint area. For example, the ICON area is divided into two parts: inside and outside, left and right parts, or upper and lower parts, as the second fingerprint area and the first fingerprint area. A fingerprint area, the area ratio of the two can be freely allocated according to actual needs.

In the embodiment of the present disclosure, the light-emitting sub-pixel of each pixel unit of the second fingerprint area 202 is different from the light-emitting sub-pixel of each pixel unit of the first fingerprint area 201. For example, the red sub-pixels, green sub-pixels, and blue sub-pixels in the pixel unit of the first fingerprint area 201 emit light, and the first light signal emitted is red-green-blue mixed light (white light), that is, three-color sub-pixels Are all lit to increase the overall intensity of the first optical signal.

In another embodiment of the present disclosure, the red sub-pixel, the green sub-pixel, and the blue sub-pixel in the pixel unit in the first fingerprint area emit light (white light); or, in the pixel unit in the first fingerprint area, The green sub-pixel and the blue sub-pixel emit light (cyan light); or, the green sub-pixel in the pixel unit in the first fingerprint area emits light. Because the service life of the blue sub-pixel is usually the shortest among the three colors, turning off the blue sub-pixel during fingerprint recognition is beneficial to prolong the service life of the blue sub-pixel. It should be noted that the above is an optional method. In practical applications, the pixel units in the first fingerprint area can emit various monochromatic lights, as long as the pixels in each sub-area of the first fingerprint area 201 are guaranteed. The color of the light formed by the cells may be the same.

In the embodiment of the present disclosure, the first light signal emitted by the pixel unit in the first fingerprint area is used for fingerprint image recognition; the second light signal emitted by the pixel unit in the second fingerprint area is used for fingerprint live recognition. In a possible implementation manner of the present disclosure, the pixel unit in the second fingerprint area is further configured to emit a third light signal with the same color as the first light signal emitted by the pixel unit in the first fingerprint area; Both the signal and the third light signal are used for fingerprint image recognition; the second light signal emitted by the pixel unit in the second fingerprint area is used for fingerprint live detection.

For example, fingerprint image recognition and fingerprint biometric recognition can be performed in two frames respectively. In the first frame of fingerprint image recognition, the color of the third light signal and the first light signal emitted by the pixel unit in the second fingerprint area The same is equivalent to sending the first light signal from the ICON area as a whole. The first light-sensitive sensor unit and the second light-sensitive sensor unit respectively receive the first light return signal and the third light return signal, which is also equivalent to the received light signal. Both are the first light return signals for fingerprint image recognition. In the second frame of fingerprint living identification, the first fingerprint area does not emit light, only the second fingerprint area emits the second light signal, and only the second photosensitive sensor unit receives the second light signal.

In a possible implementation manner of the present disclosure, in the previous two fingerprint live detections and the next two fingerprint live detections, the colors of the second light signals emitted by at least two sub-areas in the second fingerprint area are different. For example, two preset images can be preset for the ICON area. In the first fingerprint live detection, according to the first preset image, the first fingerprint area emits blue and green mixed color light, and the second fingerprint area emits red monochromatic light. , Green monochromatic light, blue monochromatic light. In the second fingerprint live detection, according to the second preset image, the first fingerprint area emits green monochromatic light, and the second fingerprint area that emits red monochrome light in the previous fingerprint live detection changes to emit blue monochromatic light Light, the second fingerprint area that emitted green monochromatic light in the previous fingerprint living detection changed to emit red monochromatic light, and the second fingerprint area that emitted blue monochromatic light in the previous fingerprint living detection changed to emit green single light. Shade. By analogy, the two visualization methods are repeatedly switched in each continuous fingerprint live detection, to avoid the pixel unit from always clicking on one color state, and to prevent the screen from aging.

Optionally, the position and/or quantity of at least one sub-areas in the second fingerprint area changes in the two fingerprint live detections of the previous one and the next one. For example, in the previous fingerprint live detection, multiple sub-areas in the second fingerprint area are discretely divided into the first fingerprint area, the first fingerprint area emits the first light signal, and the second fingerprint area emits the second light signal . In the next fingerprint living detection, the number of multiple sub-regions in the second fingerprint area increases, and the multiple sub-regions are transformed from the original discrete state to interconnected.

Optionally, in the previous two fingerprint live detections and the next two fingerprint live detections, the pixel units that were divided into at least one sub-area in the second fingerprint area in the previous fingerprint live detection are used in the next fingerprint live detection. Divide the pixel unit in the first fingerprint area; and/or, the pixel unit in the partial area of the first fingerprint area that was divided in the previous fingerprint live detection is divided into the second fingerprint in the next fingerprint live detection A pixel unit in at least one sub-region in the region. For example, in the previous fingerprint living detection, some of the pixel units were divided into the first fingerprint area, and in the next fingerprint living detection, some of the above-mentioned pixel units were divided into the second fingerprint area; there are other pixel units in the first fingerprint area. In a living body detection, it is divided into the second fingerprint area, and in the next fingerprint living body detection, the other pixel units mentioned above are divided into the first fingerprint area.

The embodiments of the present disclosure also provide a touch device, which may be a touch device such as a mobile phone and/or a tablet computer, and is particularly suitable for a full-screen mobile phone. The touch device includes the display panel provided by any of the above-mentioned embodiments of the present disclosure .

The embodiment of the present disclosure also provides a fingerprint identification method applied to the above-mentioned touch device, including the following steps:

S1: Control the pixel unit in the first fingerprint area to emit the first light signal, and control the pixel unit in the second fingerprint area to emit the second light signal.

Wherein, the first fingerprint area includes 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 includes multiple sub-areas, and the colors of the second light signals emitted by at least two sub-areas are different .

At this time, all pixel units of the display panel can be lighted up, for example, when the OLED display panel is displaying normally. Alternatively, only the pixel units in the first fingerprint area can be controlled to emit the first light signal, for example, when the display panel is in a black screen state; at the same time, the pixel units in the second fingerprint area can be controlled to emit the second light signal.

S2: Acquire a first light return signal for fingerprint image recognition through the first photosensitive sensing unit, and acquire a second light return signal for fingerprint identification in vivo through the second photosensitive sensor unit.

The first light return signal is formed by the light signal reflected by the finger from the first light signal emitted by the first fingerprint area, and is used for fingerprint image recognition. The second light return signal is formed by the light signal reflected by the finger from the second light signal emitted by the second fingerprint area, and is used for fingerprint identification.

Because the touch device and fingerprint identification method provided by the embodiments of the present disclosure include all the technical features of the display panel provided in the above embodiments, they can solve the same technical problems and achieve the same technical effects.

It should be noted that similar reference numerals and letters indicate similar items in the following figures. Therefore, once a certain item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

In the description of the present disclosure, it should also be noted that, unless otherwise clearly defined and defined, the terms “setup”, “installation”, “connected”, and “connected” should be interpreted broadly. For example, they may be fixed connections. It can also be detachably connected or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present disclosure can be understood in specific situations.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, not to limit it; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present disclosure. Scope.

Industrial applicability:

Claims

A fingerprint identification device, characterized in that it is arranged below a display panel, the display panel includes a first fingerprint area and a second fingerprint area; the first fingerprint area includes at least two pixel units, each of the pixels The colors of the first light signals emitted by the units are the same; the second fingerprint area includes a plurality of sub-areas, and the colors of the second light signals emitted by at least two of the sub-areas are different;

The fingerprint identification device includes a first photosensitive sensing unit and a second photosensitive sensing unit;

The first light-sensitive sensing unit is configured to receive a first light return signal, the first light return signal being formed by a first light signal emitted by the first fingerprint area after being reflected by a finger;

The second light-sensitive sensing unit is configured to receive a second light return signal, the second light return signal being formed by the second light signal emitted by the second fingerprint area after being reflected by the finger.
The fingerprint identification device according to claim 1, wherein the fingerprint identification device comprises a photosensitive sensor array and a light guiding structure in order from bottom to top;

The photosensitive sensor array includes a silicon-based substrate and a plurality of the first photosensitive sensor units and a plurality of the second photosensitive sensor units formed on the silicon-based substrate;

The first light return signal reaches the first photosensitive sensing unit through the light guide structure;

The second light return signal reaches the second photosensitive sensing unit through the light guide structure.
The fingerprint identification device according to claim 2, wherein the light guiding structure comprises a microlens layer and at least one light shielding layer; the microlens layer comprises a plurality of microlenses, and a plurality of microlenses are formed in the light shielding layer. Pinhole structure;

The first light return signal reaches the first photosensitive sensing unit through the microlens and the pinhole structure;

The second light return signal reaches the second photosensitive sensing unit through the microlens and the pinhole structure.
The fingerprint identification device according to claim 3, wherein the light-shielding layer has multiple layers;

A transparent optical layer is filled between two adjacent light shielding layers; the micro lens layer is arranged above the light shielding layer, and a transparent optical layer is filled between the uppermost light shielding layer and the micro lens layer.
The fingerprint identification device according to any one of claims 1 to 4, wherein an infrared filter layer is provided above the first photosensitive sensor unit and the second photosensitive sensor unit.
The fingerprint identification device according to any one of claims 1 to 5, 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-transmitting holes corresponding to the positions of the first photosensitive sensing unit and the second photosensitive sensing unit.
The fingerprint identification device according to any one of claims 2 to 6, wherein a signal line is provided in the photosensitive sensor array;

Every n of the second photosensitive sensing units are connected to the same signal line as a group.
A display panel, characterized in that it is arranged above a fingerprint identification device and includes a first fingerprint area and a second fingerprint area;

The pixel unit in the first fingerprint area emits a first light signal, and the first light signal reaches the first photosensitive sensing unit in the fingerprint identification device after being reflected by the finger; the first fingerprint area includes at least Two pixel units, the color of the first light signal emitted by each pixel unit is the same;

The pixel unit in the second fingerprint area emits a second light signal, and the second light signal reaches the second photosensitive sensing unit in the fingerprint identification device after being reflected by the finger; the second fingerprint area includes In a plurality of sub-areas, at least two of the sub-areas emit second light signals in different colors.
8. The display panel of claim 8, wherein the second fingerprint area is provided outside or inside the first fingerprint area.
The display panel according to claim 8 or 9, wherein a plurality of sub-areas of the second fingerprint area are connected.
The display panel according to any one of claims 8 to 10, wherein a plurality of sub-areas of the second fingerprint area are distributed in a discrete manner.
The display panel according to any one of claims 8 to 11, wherein the size of each of the sub-regions is 1 pixel unit, 2×2 pixel units, or 3×3 pixel units.
The display panel according to any one of claims 8 to 12, wherein 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 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.
The display panel according to any one of claims 8 to 13, wherein a red sub-pixel in a pixel unit in one or more of the sub-regions emits light; or, in one or more of the sub-regions, The green sub-pixels in the pixel units in the sub-regions emit light; or, the blue sub-pixels in the pixel units in one or more of the sub-regions emit light.
The display panel according to any one of claims 8 to 14, wherein the first light signal emitted by the pixel unit in the first fingerprint area is used for fingerprint image recognition; in the second fingerprint area The second light signal emitted by the pixel unit is used for fingerprint biometric identification.
The display panel according to any one of claims 8 to 15, wherein the pixel unit in the second fingerprint area is further configured to emit the first light emitted from the pixel unit in the first fingerprint area. A third light signal with the same signal color; both the first light signal and the third light signal are used for fingerprint image recognition; the second light signal emitted by the pixel unit in the second fingerprint area is used for fingerprint Live detection.
The display panel according to any one of claims 8 to 16, characterized in that, in the two previous and next live detections, the second light emitted by at least one sub-area in the second fingerprint area The color of the signal is different.
The display panel according to any one of claims 8 to 17, characterized in that, in the two previous and next live detections, the position and/or the position of at least one sub-area in the second fingerprint area The number has changed.
The display panel according to any one of claims 8 to 18, wherein in the two previous and next live detections, the previous fingerprint live detection is divided into the second fingerprint area The pixel unit in at least one sub-area of is divided into the pixel unit in the first fingerprint area in the next fingerprint living detection; and/or, the pixel unit in the previous fingerprint living detection is divided in the first fingerprint area The pixel units in a part of the area in the second fingerprint area are divided into pixel units in at least one sub-area in the second fingerprint area in the next fingerprint living detection.
A device characterized by comprising the fingerprint identification device according to any one of claims 1 to 7 and the display panel according to any one of claims 8 to 19.
A fingerprint identification method, characterized in that it is applied to the device according to claim 20, the method comprising:

Controlling the pixel unit of the first fingerprint area to emit a first light signal, and controlling the pixel unit of the second fingerprint area to emit a second light signal;

The first light-return signal for fingerprint image recognition is acquired by the first photosensitive sensor unit, and the second light-return signal for fingerprint living body recognition is acquired by the second photosensitive sensor unit, the The first light return signal is formed by the first light signal emitted by the first fingerprint area after being reflected by the finger, and the second light return signal is formed by the second light signal emitted by the second fingerprint area being reflected by the finger After the optical signal is formed.