TW202305651A - Fingerprint sensing apparatus and fingerprint sensing method thereof - Google Patents

Abstract

A fingerprint sensing apparatus has plural first sub-areas and plural second sub-areas and includes a fingerprint sensing device and a light emitting device. The fingerprint sensing device includes a plurality of fingerprint sensing units. The light emitting device is disposed on the fingerprint sensing device and includes a plurality of light emitting units, each of which corresponds to at least one complete fingerprint sensing unit. A first light emitting unit and a second light emitting unit of the plurality of light emitting units are disposed in each of the first sub-areas and emit respectively a first light and a second light that have different color, and a third light emitting unit of the plurality of light emitting units is disposed in each of the second sub-areas and emits a sensing light. A fingerprint sensing method is also provided.

Description

Fingerprint sensing device and fingerprint sensing method thereof

The present invention relates to a sensing device and its sensing method, and in particular to a fingerprint sensing device and its fingerprint sensing method.

The fingerprint recognition function can support a variety of applications, enhance user experience and increase added value, and is currently one of the key development projects in the industry. Since the fingerprint sensor is involved in the protection of confidential personal information, with the increasing popularity of its application, users have increasingly urgent needs for its anti-counterfeiting function. However, the existing fingerprint sensor uses color resists of red, blue and green to make the anti-counterfeit pattern on the sensing element, so three additional processes are required, resulting in increased process time and cost.

The invention provides a fingerprint sensing device capable of providing an anti-counterfeit function without increasing the manufacturing time and cost.

One embodiment of the present invention proposes a fingerprint sensing device, which has a plurality of first sub-regions and a plurality of second sub-regions, and includes: a fingerprint sensing device, including a plurality of fingerprint sensing units; and a light emitting device, located on the fingerprint The sensing device includes a plurality of light-emitting units, and each light-emitting unit corresponds to at least one complete fingerprint sensing unit, wherein the first light-emitting unit and the second light-emitting unit of the plurality of light-emitting units are located in each first sub-area and respectively The first color light and the second color light with different colors are emitted, and the third light emitting unit among the plurality of light emitting units is located in each second sub-region and emits sensing light.

In an embodiment of the present invention, the side length of the light emitting unit is greater than or equal to twice the side length of the fingerprint sensing unit.

In an embodiment of the present invention, the distribution area length of the first fingerprint sensing unit corresponding to the first light emitting unit and the second fingerprint sensing unit corresponding to the second light emitting unit is less than or equal to 300 μm.

In an embodiment of the present invention, each of the aforementioned light emitting units corresponds to 2×2 fingerprint sensing units.

In an embodiment of the present invention, each of the aforementioned light emitting units includes 3x3 pixels or 4x4 pixels.

In an embodiment of the present invention, the fourth light-emitting unit among the above-mentioned plurality of light-emitting units is located in each first sub-region and emits a third color light, and the color of the third color light is different from the first color light, the second color light, and the second color light. sense light.

In an embodiment of the present invention, the above-mentioned rows of the plurality of first sub-regions and the rows of the plurality of second sub-regions are alternately arranged.

In an embodiment of the present invention, the rows formed by the above-mentioned plurality of first sub-regions and the rows formed by the plurality of second sub-regions are alternately arranged.

In an embodiment of the present invention, the above-mentioned second sub-region surrounds the first sub-region.

In an embodiment of the present invention, the above-mentioned fingerprint sensing unit includes a fingerprint sensing element and a dimming structure located on the fingerprint sensing element.

In an embodiment of the present invention, the above-mentioned fingerprint sensing element includes a photosensitive layer sandwiched between two electrodes.

In an embodiment of the present invention, the above-mentioned dimming structure includes a light-shielding layer with openings and a microlens structure, and the microlens structures overlap the openings.

Another embodiment of the present invention proposes a fingerprint sensing method, including: providing the above-mentioned fingerprint sensing device; in the first sensing interval, the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit emit sensing light; and In the second sensing interval, the first light-emitting unit and the second light-emitting unit respectively emit a first color light and a second color light with different colors.

In an embodiment of the present invention, the above-mentioned sensing light is white light.

In an embodiment of the present invention, the third light emitting unit emits sensing light in the above-mentioned second sensing interval.

In an embodiment of the present invention, in the above-mentioned second sensing interval, the fourth light emitting unit among the plurality of light emitting units emits a third color light, and the color of the third color light is different from the first color light and the second color light.

In an embodiment of the present invention, the fourth light emitting unit emits sensing light during the above-mentioned first sensing interval.

In an embodiment of the present invention, the above-mentioned first color light is the first one among red light, blue light and green light, the second color light is the second one among red light, blue light and green light, and the third color light is The third one among red light, blue light and green light.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Throughout the specification, the same reference numerals denote the same elements. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or Intermediate elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. As used herein, "connected" may refer to physical and/or electrical connection. Furthermore, "electrically connected" or "coupled" may mean that other elements exist between two elements.

It should be understood that although the terms "first", "second", "third", etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and and/or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first "element," "component," "region," "layer" or "section" discussed below could be termed a second element, component, region, layer or section without departing from the teachings herein.

It should also be understood that when used in this specification, the terms "comprising" and/or "comprising" designate the existence of said features, regions, integers, steps, operations, elements and/or parts, but do not exclude one or more Existence or addition of other features, regions, integers, steps, operations, elements, parts and/or combinations thereof.

The terms "about," "approximately," or "substantially" as used herein include stated values and those within ordinary skill in the art, taking into account the measurements in question and the specific amount of error associated with the measurements (i.e., limitations of the measurement system). The average value within an acceptable range of deviation from a specified value as determined by a human being. For example, "about" can mean within one or more standard deviations, or within ±30%, ±20%, ±10%, ±5% of the stated value. Furthermore, "about", "approximately", or "substantially" used herein may select a more acceptable range of deviation or standard deviation based on optical properties, etching properties or other properties, and may not use one standard deviation to apply to all nature.

Exemplary embodiments are described herein with reference to cross section illustrations that are schematic illustrations of idealized embodiments. Accordingly, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances are to be expected. Thus, embodiments described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, a region shown or described as flat, may, typically, have rough and/or non-linear features. Additionally, acute corners shown may be rounded. Thus, the regions shown in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the claims.

FIG. 1A is a partial perspective view of a fingerprint sensing device 10 according to an embodiment of the present invention. FIG. 1B is a schematic partial top view of the fingerprint sensing device 10 shown in FIG. 1A . FIG. 1C is a partial cross-sectional schematic diagram of the fingerprint sensing device 100 of the fingerprint sensing device 10 shown in FIG. 1A . FIG. 1D is a schematic top view of the light emitting unit 210 of the light emitting device 200 of the fingerprint sensing device 10 shown in FIG. 1A .

1A to 1D, the fingerprint sensing device 10 has a plurality of first sub-regions A1 and a plurality of second sub-regions A2, and includes: a fingerprint sensing device 100, including a plurality of fingerprint sensing units 110; and light emitting The device 200, located on the fingerprint sensing device 100, includes a plurality of light emitting units 210, and each light emitting unit 210 corresponds to at least one complete fingerprint sensing unit 110, wherein the first light emitting unit 211 and the second light emitting unit 210 of the plurality of light emitting units 210 The second light emitting unit 212 is located in each first sub-area A1 and emits a first color light and a second color light with different colors respectively, and the third light emitting unit 213 among the plurality of light emitting units 210 is located in each second sub area A2 and emits sensing light .

In the fingerprint sensing device 10 according to an embodiment of the present invention, the first light emitting unit 211 and the second light emitting unit 212 located in the first sub-area A1 respectively emit the first color light and the second color light of different colors, so that The sensing signals of the fingerprint sensing unit 111 corresponding to the first light emitting unit 211 and the fingerprint sensing unit 112 corresponding to the second light emitting unit 212 can be used to distinguish the authenticity of the finger.

Hereinafter, with reference to FIG. 1A to FIG. 1D , the implementation of each element of the fingerprint sensing device 10 will be continuously described, but the present invention is not limited thereto.

First, please refer to FIG. 1A to FIG. 1C at the same time. In this embodiment, a plurality of fingerprint sensing units 110 of the fingerprint sensing device 100 may be arranged in a matrix. For example, the fingerprint sensing unit 110 may include a fingerprint sensing element SC and a dimming structure CS on the fingerprint sensing element SC. The fingerprint sensing element SC may be a visible light fingerprint sensing element or an invisible light fingerprint sensing element, such as an infrared light fingerprint sensing element.

Specifically, the fingerprint sensing element SC may include, for example, a first electrode SC1 , a photosensitive layer SC2 and a second electrode SC3 . The first electrode SC1 , the photosensitive layer SC2 and the second electrode SC3 are sequentially stacked on the substrate SB in this order, such that the photosensitive layer SC2 is sandwiched between the first electrode SC1 and the second electrode SC3 . In some embodiments, the area of the second electrode SC3 is larger than the area of the photosensitive layer SC2, and the contours of the first electrode SC1 and the second electrode SC3 may partially overlap. In some embodiments, the first electrode SC1 and the second electrode SC3 may include a light-transmitting conductive material or a light-impermeable conductive material. For example, light from the outside (such as light reflected by fingerprints) will pass through the second electrode SC3 and enter the photosensitive layer SC2. Based on this, the second electrode SC3 can be made of light-transmitting conductive material. The photosensitive layer SC2 has the characteristic of converting light energy into electrical energy, so as to realize the function of optical sensing. In some embodiments, the material of the photosensitive layer SC2 may include a silicon-rich material, which may be silicon-rich oxide, silicon-rich nitride, silicon-rich oxynitride, silicon-rich carbide, silicon-rich oxycarbide, hydrogenated silicon-rich Oxide, hydrogenated silicon-rich nitride, hydrogenated silicon-rich carbide, or other suitable materials or combinations thereof.

In some embodiments, the fingerprint sensing device 100 may further include planar layers PL1a, PL1b. The flat layer PL1a is, for example, located between the first electrode SC1 and the second electrode SC3 of the fingerprint sensing element SC. In some embodiments, the flat layer PL1a has an opening OP exposing the first electrode SC1 of the fingerprint sensing element SC, wherein the photosensitive layer SC2 is located in the opening OP and contacts the first electrode SC1, and the second electrode SC3 can be disposed on the photosensitive The layer SC2 is in contact with the photosensitive layer SC2, and the second electrode SC3 may be located between the flat layer PL1a and the flat layer PL1b.

In this embodiment, the fingerprint sensing device 100 may further include light-shielding layers BM1, BM2, BM3, planar layers PL2, PL3, and a plurality of microlens structures ML located above the fingerprint sensing element SC, wherein the light-shielding layer BM1 is located on the flat layer. On PL1b, the flat layer PL2 is located between the light shielding layer BM1 and the light shielding layer BM2, the flat layer PL3 is located between the light shielding layer BM2 and the light shielding layer BM3, and the microlens structure ML is located on the flat layer PL3. The light shielding layer BM1 may have a plurality of openings O1, and the orthographic projections of the openings O1 on the substrate SB may respectively overlap the orthographic projections of the photosensitive layer SC2 of the fingerprint sensing element SC on the substrate SB. Likewise, the light shielding layer BM2 may have a plurality of openings O2, and the orthographic projections of the openings O2 on the substrate SB may respectively overlap the orthographic projections of the openings O1 on the substrate SB. The light-shielding layer BM3 may have a plurality of openings O3, the orthographic projections of the openings O3 on the substrate SB may respectively overlap the orthographic projections of the openings O2 on the substrate SB, and the microlens structures ML may be disposed in the openings O3. In other words, the microlens structure ML can also overlap the openings O1 and O2. In some embodiments, central axes of the openings O1, O2 and the microlens structure ML may overlap. In this way, the openings O1 and O2 combined with the microlens structure ML can control the light receiving angle of the fingerprint sensing element SC, so as to realize the light collimation design. It can be known from the above that the light-shielding layers BM1 , BM2 , BM3 , the flat layers PL2 , PL3 and the microlens structure ML can constitute the light-adjusting structure CS of the fingerprint sensing unit 110 .

The material of the light-shielding layers BM1, BM2, and BM3 may include light-shielding materials such as metal, metal oxide, black resin or graphite, or a stack of the above-mentioned light-shielding materials. For example, in some embodiments, the light-shielding layers BM1, BM2, and BM3 may include a stack of metal layers and semi-transparent metal oxide layers, wherein the material of the metal layer may include metals with good electrical conductivity, such as aluminum, molybdenum, Titanium, copper, silver and other metals or their laminates, and the material of the semi-transparent metal oxide layer can include metal oxides that can reduce the reflectivity of the metal layer, such as molybdenum-tantalum oxide (MoTaOx) or molybdenum-niobium oxide (MoNbOx) etc., but not limited to this. In addition, the planar layers PL1a, PL1b, PL2, and PL3 may include, for example, a stacked layer of an organic material layer and an inorganic material layer, wherein the organic material layer may include, for example, polyimide, polyester, benzocyclobutene (benzocyclobutene, BCB ), polymethylmethacrylate (polymethylmethacrylate, PMMA), polyvinyl phenol (poly(4-vinylphenol), PVP), polyvinyl alcohol (polyvinyl alcohol, PVA), polytetrafluoroethylene (polytetrafluoroethene, PTFE), hexamethyl Hexamethyldisiloxane (HMDSO) or a stacked layer of at least two of the above materials, but not limited thereto, the inorganic material layer may include, for example, silicon oxide, silicon nitride, silicon oxynitride, or at least two of the above materials Stacked layers, but not limited to this.

Please refer to FIG. 1A , FIG. 1B and FIG. 1D at the same time. In this embodiment, the plurality of light emitting units 210 of the light emitting device 200 may be arranged in a matrix, and the light emitting units 210 may have the same size, but not limited thereto. In some embodiments, the sizes of the light emitting units 210 may be different from each other.

For example, in this embodiment, the light emitting unit 210 may include a first light emitting unit 211 and a second light emitting unit 212 located in the first subregion A1 and a third light emitting unit 213 located in the second subregion A2, and the first The light emitting unit 211 , the second light emitting unit 212 and the third light emitting unit 213 may have a structure as shown in FIG. 1D . Specifically, please refer to FIG. 1D. In this embodiment, the first light-emitting unit 211, the second light-emitting unit 212, and the third light-emitting unit 213 may respectively include a plurality of pixels PX, for example, 3x3 pixels PX, so that light The device 200 may serve as a display device. A plurality of pixels PX may be arranged in an array, and each pixel PX may include, for example, 3 sub-pixels SP. Each sub-pixel SP may include at least one switch element SW, at least one light emitting element LE, and at least two signal lines SL, DL, wherein the switch element SW may include a first terminal Ta, a second terminal Tb, and a control terminal Tc, and the switch element The first end Ta of the SW can be electrically connected to the light emitting element LE, the second end Tb of the switch element SW can be electrically connected to the signal line DL, and the control end Tc of the switch element SW can be electrically connected to the signal line SL. In some embodiments, the switching element SW may be a thin film transistor, such as a top gate thin film transistor, a bottom gate thin film transistor or a double gate thin film transistor, but is not limited thereto.

The signal line SL and the signal line DL can transmit electrical signals to the switch element SW, the signal line SL is, for example, a scan line, and the signal line DL is, for example, a data line. In this embodiment, the signal line SL and the signal line DL may be orthogonal to each other, but the present invention is not limited thereto. In some embodiments, the signal line SL and the signal line DL may intersect at other angles. In some embodiments, each sub-pixel SP may include two or more switching elements SW. In some embodiments, each sub-pixel SP may further include at least one capacitor structure. In this embodiment, other signal lines such as a power line and a common signal line can be further provided in the light emitting device 200 to provide the power signal and the common signal to each sub-pixel SP.

In this embodiment, the light emitting elements LE may be arranged in an array, and correspondingly electrically connected to the first terminal Ta of the switching element SW. Through the switch element SW, the light emitting element LE can be electrically connected to one of the plurality of signal lines DL correspondingly. The light emitting elements LE in the multiple sub-pixels SP electrically connected to the same signal line DL can emit light of the same color. , E22, E23 can emit a second color light (such as green light), and the light-emitting elements E31, E32, E33 can emit a third color light (such as blue light), and are electrically connected to the same signal line SL among multiple sub-pixels SP The light emitting elements LE (eg light emitting elements E11 , E21 , E31 ) can emit light of different colors. In this embodiment, the light emitting element LE may be a self-luminous element, such as an organic electroluminescent diode (OLED) or a micro light emitting diode (Micro LED), etc., but the present invention is not limited thereto.

Please refer to FIG. 1B, in the fingerprint sensing device 10 formed by stacking the fingerprint sensing device 100 and the light emitting device 200, the first light emitting unit 211 may correspond to the complete fingerprint sensing unit 111, in other words, the fingerprint sensing unit 111 The orthographic projection on the light emitting device 200 may completely fall into the first light emitting unit 211 . Likewise, the second light emitting unit 212 may correspond to the complete fingerprint sensing unit 112 , that is, the orthographic projection of the fingerprint sensing unit 112 on the light emitting device 200 may completely fall into the second light emitting unit 212 . In this embodiment, since the size of the third light-emitting unit 213 is the same as that of the first light-emitting unit 211 and the second light-emitting unit 212, the third light-emitting unit 213 can also correspond to the complete fingerprint sensing unit 113, but not in this way. limit.

In some embodiments, in order to ensure that the first light emitting unit 211 and the second light emitting unit 212 of the light emitting device 200 can respectively correspond to at least one complete fingerprint sensing unit 111, 112, the first light emitting unit 211 and the second light emitting unit can be The side length W1 of 212 is greater than or equal to twice the side length W2 of the fingerprint sensing unit 110 . In some embodiments, the first light emitting unit 211 , the second light emitting unit 212 and the third light emitting unit 213 may correspond to 2×2 or more fingerprint sensing units 110 respectively.

Since the size of a complete peak or trough in the fingerprint of an ordinary adult is approximately between 200 and 300 μm, in some embodiments, the distribution area length L1 of the fingerprint sensing unit 111 and the fingerprint sensing unit 112 may be less than or It is equal to 300 μm to ensure that the sensing signals of different color lights can be measured within the same peak or trough range of the fingerprint. In some embodiments, at least one fingerprint sensing unit 110 may be disposed between the fingerprint sensing unit 111 and the fingerprint sensing unit 112 to avoid light mixing between the fingerprint sensing unit 111 and the fingerprint sensing unit 112 . In some embodiments, the distance S1 between the fingerprint sensing unit 111 and the fingerprint sensing unit 112 may be between 50 μm and 200 μm, but is not limited thereto.

In this embodiment, when the fingerprint sensing device 10 performs fingerprint sensing, the first light-emitting unit 211 and the second light-emitting unit 212 located in the first sub-area A1 can respectively emit light of different colors. For example, in the first light-emitting unit 211, only the light-emitting elements E11, E12, and E13 can emit light, while the light-emitting elements E21, E22, E23, E31, E32, and E33 do not emit light, so that the first light-emitting unit 211 can emit the first color. In the second light-emitting unit 212, only the light-emitting elements E21, E22, and E23 can emit light, while the light-emitting elements E11, E12, E13, E31, E32, and E33 do not emit light, so that the second light-emitting unit 212 can emit light of the second color. In this way, the fingerprint sensing unit 111 corresponding to the first light emitting unit 211 can measure the sensing signal of the fingerprint reflecting the first color light, and the fingerprint sensing unit 112 corresponding to the second light emitting unit 212 can measure the fingerprint reflecting the second color light. Sensing signal of color light. Since a finger or a fake finger has different reflectivity for the first color light and the second color light, it is possible to distinguish and trigger the fingerprint sensing device 10 by comparing the sensing signals measured by the fingerprint sensing units 111 and 112. Fingerprint sensing is a real finger or a fake finger.

In addition, when the fingerprint sensing device 10 performs fingerprint sensing, the third light-emitting unit 213 located in the second sub-area A2 can emit sensing light for fingerprint sensing, for example, the light-emitting elements E11 and E12 in the third light-emitting unit 213 . Fingerprint images reflecting white light for fingerprint comparison and identification.

In this embodiment, a first light-emitting unit 211 and a second light-emitting unit 212 may be provided in the first sub-region A1, and the first light-emitting unit 211 and the second light-emitting unit 212 may respectively correspond to at least four fingerprint sensing units 110 , therefore, the number of fingerprint sensing units 110 located in the first sub-area A1 may be greater than eight. In some embodiments, three or more light-emitting units 210 may be provided in the first sub-area A1, so that the number of fingerprint sensing units 110 located in the first sub-area A1 may be greater than 16, or even up to 36. In some embodiments, the size of the first sub-region A1 may be between 140 μm×280 μm to 400 μm×400 μm.

In this embodiment, the first sub-regions A1 are arranged in columns along the first direction D1, and the second sub-regions A2 are also arranged in columns along the first direction D1, and the columns of the first sub-regions A1 and the second sub-regions The columns arranged by A2 are alternately arranged along the second direction D2. However, the arrangement of the first sub-area A1 and the second sub-area A2 is not limited thereto, as long as the sensing signals sufficient to distinguish the authenticity of the finger and to identify the characteristics of the fingerprint can be measured at the same time. For example, in this embodiment, the second direction D2 and the first direction D1 are orthogonal to each other, but it is not limited thereto. In some embodiments, the second direction D2 and the first direction D1 may intersect but are not orthogonal.

In some embodiments, 3 to 9 complete fingerprint sensing units 113 may be spaced between the columns arranged in the first sub-area A1 to ensure that the fingerprints in the second sub-area A2 between the first sub-areas A1 The sensing unit 113 is capable of detecting sensing signals sufficient to identify fingerprint features. In other words, the number of fingerprint sensing units 113 arranged in a single row along the second direction D2 in the second sub-area A2 may be between 3 and 9. In some embodiments, the spacing S2 between the rows of the first sub-regions A1 (ie the length of the second sub-regions A2 in the second direction D2 ) may be between 200 μm and 700 μm. In some embodiments, the number of the second sub-areas A2 between the first sub-areas A1 may be less than or equal to 1, in other words, the number of the second sub-areas A2 between the first sub-areas A1 may be 0, And the number of the second sub-area A2 between some of the first sub-areas A1 can be 1, so as to ensure that the fingerprint sensing units 111, 112, 113 located in the first sub-area A1 and the second sub-area A2 can simultaneously detect The sensing signal is sufficient to distinguish the authenticity of the finger and to identify the characteristics of the fingerprint.

In the following, other embodiments of the present invention are continued to be described using FIGS. 2 to 4, and the component numbers and related contents of the embodiment in FIGS. Descriptions of the same technical contents are omitted. For the description of the omitted parts, reference may be made to the embodiment shown in FIG. 1A to FIG. 1D , which will not be repeated in the following description.

FIG. 2 is a schematic partial top view of a fingerprint sensing device 20 according to an embodiment of the present invention. The fingerprint sensing device 20 has a plurality of first sub-regions A1 and a plurality of second sub-regions A2, and includes: a fingerprint sensing device 100a including a plurality of fingerprint sensing units 110a; and a light emitting device 200a located in the fingerprint sensing device 100a includes a plurality of light emitting units 210a, wherein the first light emitting unit 211a and the second light emitting unit 212a of the plurality of light emitting units 210a are located in each first sub-region A1 and respectively emit the first color light and the third light of different colors. color light, the third light emitting unit 213a of the plurality of light emitting units 210a is located in each second sub-area A2 and emits sensing light, and the first light emitting unit 211a, the second light emitting unit 212a and the third light emitting unit 213a respectively correspond to at least one complete Fingerprint sensing units 111a, 112a, 113a.

Compared with the fingerprint sensing device 10 shown in FIGS. 1A to 1D , the fingerprint sensing device 20 shown in FIG. 2 is different in that: the first sub-area A1 of the fingerprint sensing device 20 is along the second direction D2 Arranged in rows, the second sub-regions A2 are also arranged in rows along the second direction D2, and the rows of the first sub-regions A1 and the rows of the second sub-regions A2 are alternately arranged along the first direction D1.

In some embodiments, 3 to 9 complete fingerprint sensing units 113a may be spaced between the rows of the first sub-area A1 to ensure that the fingerprints in the second sub-area A2 between the first sub-areas A1 The sensing unit 113a is capable of detecting sensing signals sufficient to identify fingerprint features. In other words, the number of fingerprint sensing units 113a arranged in a single row along the first direction D1 in the second sub-area A2 may range from 3 to 9, but is not limited thereto. In some embodiments, the spacing S3 between rows of the first sub-regions A1 (ie the length of the second sub-regions A2 in the first direction D1 ) may be between 200 μm and 700 μm. In some embodiments, the number of the second sub-areas A2 between the first sub-areas A1 may be less than or equal to 1, so as to ensure that the fingerprint sensing units 111a, 112a, 112a, 113a can simultaneously measure sensing signals sufficient to distinguish the authenticity of the finger and to identify the characteristics of the fingerprint.

In addition, in this embodiment, the first light emitting unit 211a and the second light emitting unit 212a may respectively include 4x4 pixels PX, and the size of the third light emitting unit 213a may be different from that of the first light emitting unit 211a or the second light emitting unit 212a size of.

In this embodiment, when the fingerprint sensing device 20 is performing fingerprint sensing, the first light emitting unit 211 a and the second light emitting unit 212 a located in the first sub-area A1 can respectively emit light of different colors. For example, the pixels PX in the first light emitting unit 211a can all emit light of the first color, and the pixels PX in the second light emitting unit 212a can all emit light of the third color. In this way, the fingerprint sensing unit 111a corresponding to the first light emitting unit 211a can detect the sensing signal of the fingerprint reflecting the first color light, and the fingerprint sensing unit 112a corresponding to the second light emitting unit 212a can measure the fingerprint reflecting the third color light. Sensing signal of color light. Since a finger or an object with a fake finger has different reflectivity for the first color light and the third color light, it can be distinguished by comparing the sensing signals measured by the fingerprint sensing units 111a and 112a to trigger the fingerprint sensing device 20 to perform Fingerprint sensing for authenticity of the finger.

Similarly, when the fingerprint sensing device 20 performs fingerprint sensing, the third light emitting unit 213a located in the second sub-area A2 can emit sensing light for fingerprint sensing, for example, the pixel PX in the third light emitting unit 213a can The fingerprint sensing unit 113a that emits white light and corresponds to the third light emitting unit 213a can measure the fingerprint image of the fingerprint reflecting the white light for fingerprint comparison and identification.

FIG. 3 is a schematic partial top view of a fingerprint sensing device 30 according to an embodiment of the present invention. The fingerprint sensing device 30 has a plurality of first sub-regions A1 and a plurality of second sub-regions A21, A22, A23, and includes: a fingerprint sensing device 100b including a plurality of fingerprint sensing units 110b; and a light emitting device 200b located at The fingerprint sensing device 100b includes a plurality of light-emitting units 210b, wherein the first light-emitting unit 211b and the second light-emitting unit 212b of the plurality of light-emitting units 210b are located in each first sub-area A1 and respectively emit different first colors. light and the second color light, the third light emitting unit 213b in the plurality of light emitting units 210b is located in each of the second sub-regions A21, A22, A23 and emits sensing light, and the first light emitting unit 211b, the second light emitting unit 212b and the third light emitting unit The unit 213b corresponds to at least one complete fingerprint sensing unit 111b, 112b, 113b respectively.

Compared with the fingerprint sensing device 10 shown in FIGS. 1A to 1D , the difference of the fingerprint sensing device 30 shown in FIG. The first sub-area A1, and the plurality of light-emitting units 210b of the fingerprint sensing device 30 may further include a fourth light-emitting unit 214, the fourth light-emitting unit 214 is located in the first sub-area A1 and emits a third color light, and the color of the third color light It is different from the first color light, the second color light and the sensing light.

For example, in this embodiment, the first sub-area A1 and the second sub-area A21 of the fingerprint sensing device 30 are arranged alternately along the first direction D1, and the first sub-area A1 and the second sub-area of the fingerprint sensing device 30 The regions A22 are alternately arranged along the second direction D2, and the second subregions A22 and the second subregions A23 are alternately arranged along the first direction D1, and the second subregions A21 and the second subregions A23 are alternately arranged along the second direction D2, so that The number of the second sub-region A21 or the second sub-region A22 between the first sub-regions A1 is one. In this embodiment, the sizes of the second sub-regions A21 , A22 , A23 are different from each other, but not limited thereto. In some embodiments, the sizes of the second sub-regions A21, A22, A23 may also be the same.

In some embodiments, 3 to 9 complete fingerprint sensing units 113b may be separated between the first sub-regions A1 arranged along the first direction D1 and the second direction D2. In other words, the second sub-region A21 along the first The single row of fingerprint sensing units 113b arranged in the direction D1 or the number of the single row of fingerprint sensing units 113b arranged in the second sub-region A22 along the second direction D2 can be between 3 and 9, so as to ensure that they are located in the second sub-region A21, The fingerprint sensing units 113b of A22 and A23 can detect sensing signals sufficient to identify fingerprint features.

In this embodiment, the fourth light emitting unit 214 may correspond to at least one complete fingerprint sensing unit 114 . In some embodiments, the distribution area length L2 of the fingerprint sensing units 111b, 112b, 114 may be less than or equal to 300 μm, so as to ensure that the first color light and the second color light can be detected within the range of the same peak or trough of the fingerprint. Sensing signals of color light and tertiary color light. In some embodiments, at least one fingerprint sensing unit 110b may be disposed between the fingerprint sensing units 111b, 112b, 114 to avoid light mixing between the fingerprint sensing units 111b, 112b, 114. In some embodiments, the third light emitting unit 213b may also be located in the first sub-region A1.

In this embodiment, when the fingerprint sensing device 30 performs fingerprint sensing, the first light-emitting unit 211b, the second light-emitting unit 212b, and the fourth light-emitting unit 214 located in the first sub-area A1 can respectively emit first and second light-emitting units with different colors. Color light, second color light, and third color light, so that the fingerprint sensing unit 111b corresponding to the first light emitting unit 211b can measure the sensing signal of the fingerprint reflecting the first color light, and the fingerprint sensor corresponding to the second light emitting unit 212b The detection unit 112b can detect the sensing signal of the fingerprint reflecting the second color light, and the fingerprint sensing unit 114 corresponding to the fourth light emitting unit 214 can detect the sensing signal of the fingerprint reflecting the third color light. Since a finger or a fake finger has different reflectivity for the first color light, the second color light, and the third color light, the trigger can be distinguished by comparing the sensing signals measured by the fingerprint sensing units 111b, 112b, and 114. The fingerprint sensing device 30 performs fingerprint sensing for the authenticity of the finger.

Similarly, when the fingerprint sensing device 30 performs fingerprint sensing, the third light emitting unit 213b located in the second sub-area A21, A22, A23 can emit sensing light (such as white light) for fingerprint sensing, and corresponding to the third light emitting unit 213b. The fingerprint sensing unit 113b of the unit 213b can measure the fingerprint image of the fingerprint reflecting white light for fingerprint comparison and identification.

FIG. 4 is a flowchart of a fingerprint sensing method according to an embodiment of the invention. In this embodiment, at step 410, the fingerprint sensing device 10, the fingerprint sensing device 20, or the fingerprint sensing device 30 as described above may be provided. For the relevant technical content of the fingerprint sensing devices 10 , 20 , 30 , reference may be made to the embodiments shown in FIG. 1A to FIG. 3 , which will not be repeated here. In the following steps, the fingerprint sensing device 30 is taken as an example for illustration.

Please refer to FIG. 3 and FIG. 4 at the same time. In step 420, the fingerprint sensing device 30 enters the first sensing interval. All emit sensing light, such as white light, so that the fingerprint sensing units 111b, 112b, 113b, and 114 can measure the fingerprint image of the fingerprint reflecting white light after fingerprint sensing, so as to perform fingerprint comparison and identification.

In step 430, the fingerprint sensing device 30 enters the second sensing interval, at this time the first light emitting unit 211b, the second light emitting unit 212b and the fourth light emitting unit 214 respectively emit the first color light, the second color light and the second color light with different colors. Three-color light, so that the fingerprint sensing unit 111b corresponding to the first light emitting unit 211b can measure the sensing signal of the fingerprint reflecting the first color light, and the fingerprint sensing unit 112b corresponding to the second light emitting unit 212b can measure the fingerprint reflecting the second color light and the fingerprint sensing unit 114 corresponding to the fourth light emitting unit 214 can detect the sensing signal of the fingerprint reflecting the third color light. Since a finger or a fake finger has different reflectivity for the first color light, the second color light, and the third color light, the trigger can be distinguished by comparing the sensing signals measured by the fingerprint sensing units 111b, 112b, and 114. The fingerprint sensing device 30 performs fingerprint sensing for the authenticity of the finger.

In this embodiment, the first colored light, the second colored light and the third colored light are different from each other. In some embodiments, the first color light can be the first one of red light, blue light and green light, the second color light can be the second one of red light, blue light and green light, and the third color light can be red light. The third among light, blue light and green light. For example, the first color light can be red light, the second color light can be green light, and the third color light can be blue light.

In some embodiments, the third light-emitting unit 213b also emits sensing light during the second sensing interval, so that the fingerprint sensing unit 113b can still detect the fingerprint image of the fingerprint reflecting the sensing light at the end of the second sensing interval, so as to provide Fingerprint comparison and identification. In some embodiments, the first sensing period and the second sensing period may be respectively between 10 and 200 milliseconds (ms).

To sum up, the fingerprint sensing device of the present invention uses the first light-emitting unit and the second light-emitting unit located in the first sub-region to respectively emit the first color light and the second color light of different colors, so that the corresponding first light-emitting unit The fingerprint sensing unit and the sensing signal of the fingerprint sensing unit corresponding to the second light-emitting unit can be used for anti-counterfeiting, and the third light-emitting unit located in the second sub-region can be used for fingerprint identification.

Although the present invention has been disclosed above with the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field may make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention should be defined by the scope of the appended patent application.

10, 20, 30: Fingerprint sensing devices 100, 100a, 100b: fingerprint sensing device 110, 111, 112, 113: fingerprint sensing unit 110a, 111a, 112a, 113a: fingerprint sensing unit 110b, 111b, 112b, 113b, 114: fingerprint sensing unit 200, 200a, 200b: light emitting device 210, 210a, 210b: light emitting unit 211, 211a, 211b: the first light emitting unit 212, 212a, 212b: the second light emitting unit 213, 213a, 213b: the third light emitting unit 214: The fourth light-emitting unit 410, 420, 430: steps A1: The first sub-area A2, A21, A22, A23: the second sub-area BM1, BM2, BM3: shading layer CS: dimming structure D1: the first direction D2: Second direction DL: signal line E11, E12, E13, E21, E22, E23: light emitting elements E31, E32, E33: light emitting elements L1, L2: length of distribution area LE: light emitting element ML: microlens structure O1, O2, O3: opening OP: opening PL1a, PL1b, PL2, PL3: Planarization layer PX: pixel S1, S2, S3: Spacing SB: Substrate SC: Fingerprint sensor SC1: first electrode SC2: photosensitive layer SC3: Second electrode SL: signal line SP: sub-pixel SW: switching element Ta: the first end Tb: the second end Tc: control terminal W1, W2: side length

FIG. 1A is a partial perspective view of a fingerprint sensing device 10 according to an embodiment of the present invention. FIG. 1B is a schematic partial top view of the fingerprint sensing device 10 shown in FIG. 1A . FIG. 1C is a partial cross-sectional schematic diagram of the fingerprint sensing device 100 of the fingerprint sensing device 10 shown in FIG. 1A . FIG. 1D is a schematic top view of the light emitting unit 210 of the light emitting device 200 of the fingerprint sensing device 10 shown in FIG. 1A . FIG. 2 is a schematic partial top view of a fingerprint sensing device 20 according to an embodiment of the present invention. FIG. 3 is a schematic partial top view of a fingerprint sensing device 30 according to an embodiment of the present invention. FIG. 4 is a flowchart of a fingerprint sensing method according to an embodiment of the invention.

10:Fingerprint sensing device

100: Fingerprint sensing device

110, 111, 112, 113: fingerprint sensing unit

200: Lighting device

210: light emitting unit

211: The first light-emitting unit

212: the second light emitting unit

213: The third light-emitting unit

A1: The first sub-area

A2: Second sub-area

D1: the first direction

D2: Second direction

L1: Distribution area length

S1, S2: Spacing

W1, W2: side length

Claims (18)

A fingerprint sensing device has a plurality of first sub-areas and a plurality of second sub-areas, and includes: A fingerprint sensing device comprising a plurality of fingerprint sensing units; and The light emitting device is located on the fingerprint sensing device and includes a plurality of light emitting units, and each of the light emitting units corresponds to at least one complete fingerprint sensing unit, Wherein, the first light-emitting unit and the second light-emitting unit in the plurality of light-emitting units are located in each of the first sub-regions and respectively emit a first color light and a second color light of different colors, and among the plurality of light-emitting units The third light emitting unit is located in each of the second sub-regions and emits sensing light. The fingerprint sensing device according to claim 1, wherein the side length of the light emitting unit is greater than or equal to twice the side length of the fingerprint sensing unit. The fingerprint sensing device according to claim 1, wherein the distribution area length of the first fingerprint sensing unit corresponding to the first light emitting unit and the second fingerprint sensing unit corresponding to the second light emitting unit is less than or equal to 300 μm. The fingerprint sensing device according to claim 1, wherein each of the light emitting units corresponds to 2×2 fingerprint sensing units. The fingerprint sensing device according to claim 1, wherein each of the light emitting units includes 3x3 pixels or 4x4 pixels. The fingerprint sensing device according to claim 1, wherein the fourth light-emitting unit in the plurality of light-emitting units is located in each of the first sub-regions and emits a third color light, and the color of the third color light is different from the The first color light, the second color light and the sensing light. The fingerprint sensing device according to claim 1, wherein the rows of the plurality of first sub-regions are alternately arranged with the rows of the plurality of second sub-regions. The fingerprint sensing device according to claim 1, wherein the rows of the plurality of first sub-regions are alternately arranged with the rows of the plurality of second sub-regions. The fingerprint sensing device as claimed in claim 1, wherein the second sub-area surrounds the first sub-area. The fingerprint sensing device according to claim 1, wherein the fingerprint sensing unit includes a fingerprint sensing element and a light-adjusting structure on the fingerprint sensing element. The fingerprint sensing device as claimed in claim 10, wherein the fingerprint sensing element includes a photosensitive layer sandwiched between two electrodes. The fingerprint sensing device according to claim 10, wherein the light-adjusting structure includes a light-shielding layer with an opening and a microlens structure, and the microlens structure overlaps the opening. A fingerprint sensing method, comprising: Provide the fingerprint sensing device as described in claim 1; In the first sensing interval, the first light emitting unit, the second light emitting unit and the third light emitting unit emit the sensing light; and In the second sensing interval, the first light emitting unit and the second light emitting unit respectively emit a first color light and a second color light with different colors. The fingerprint sensing method as claimed in claim 13, wherein the sensing light is white light. The fingerprint sensing method according to claim 13, wherein the third light emitting unit emits the sensing light during the second sensing interval. The fingerprint sensing method according to claim 13, wherein in the second sensing interval, the fourth light-emitting unit among the plurality of light-emitting units emits light of a third color, and the color of the light of the third color is different from that of the first light a color light and the second color light. The fingerprint sensing method according to claim 16, wherein in the first sensing interval, the fourth light emitting unit emits the sensing light. The fingerprint sensing method according to claim 16, wherein the first color light is the first one of red light, blue light and green light, and the second color light is the second one of red light, blue light and green light Alternatively, the third color light is the third one among red light, blue light and green light.

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