CN112861569B - Fingerprint sensing panel and operation method thereof - Google Patents
Fingerprint sensing panel and operation method thereof Download PDFInfo
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- CN112861569B CN112861569B CN201911172978.5A CN201911172978A CN112861569B CN 112861569 B CN112861569 B CN 112861569B CN 201911172978 A CN201911172978 A CN 201911172978A CN 112861569 B CN112861569 B CN 112861569B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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Abstract
The invention provides a fingerprint sensing panel and an operation method thereof. The fingerprint sensing panel comprises a first electrode strip, a second electrode strip, a third electrode strip and a fingerprint sensing electrode. The first electrode strip is configured on the first conductive layer. The second electrode strip, the third electrode strip and the fingerprint sensing electrode are arranged on the second conductive layer. The third electrode strip is parallel to the second electrode strip. The first electrode bar spans the second electrode bar and the third electrode bar. In the touch detection mode, the first electrode bar, the second electrode bar and the third electrode bar are used for touch detection. The fingerprint sensing electrode is arranged between the second electrode bar and the third electrode bar. In the fingerprint sensing mode, fingerprint sensing electrodes are used for fingerprint sensing.
Description
Technical Field
The present disclosure relates to sensing panels, and particularly to a fingerprint sensing panel and an operating method thereof.
Background
Technologies for under-screen fingerprinting (Fingerprint on Display, FOD) are becoming increasingly popular. In response to design requirements, integrated Circuit (IC) designs require architectural integration for capacitive fingerprint sensing and capacitive finger touch detection. However, the capacitance sensed by the fingerprint is very different from that detected by the finger touch (up to 10000 times). The difference between the capacitance sensed by the fingerprint and the capacitance sensed by the finger touch is one of the bottlenecks in the design of the IC. Therefore, how to reduce the capacitance of the two electrodes is one of the important technical issues.
It should be noted that the content of the "background art" section is intended to aid in understanding the present invention. Some (or all) of the disclosure in the background section may not be prior art as known to those of skill in the art. The disclosure in the background section is not presented to persons of ordinary skill in the art prior to the application of the invention.
Disclosure of Invention
The invention provides a fingerprint sensing panel and an operation method thereof. The fingerprint sensing panel has a touch detection function and a fingerprint sensing function.
The fingerprint sensing panel comprises a plurality of first electrode strips, a second electrode strip, a third electrode strip and a plurality of fingerprint sensing electrodes. The first electrode strips are arranged on the first conductive layer, wherein the first electrode strips are parallel to each other. The second electrode strip and the third electrode strip are configured on the second conductive layer. The long axis direction of the third electrode bar is the same as the long axis direction of the second electrode bar, the long axis directions of the second electrode bar and the third electrode bar are different from the long axis direction of the first electrode bar, and the first electrode bar spans the second electrode bar and the third electrode bar. In the touch detection mode, the first electrode bar, the second electrode bar and the third electrode bar are used for touch detection. The fingerprint sensing electrodes are arranged on the second conductive layer and between the second electrode strips and the third electrode strips, wherein the first electrode strips span the fingerprint sensing electrodes. In the fingerprint sensing mode, fingerprint sensing electrodes are used for fingerprint sensing.
The operation method of the fingerprint sensing panel comprises the following steps: disposing a plurality of first electrode strips on the first conductive layer of the fingerprint sensing panel, wherein the first electrode strips are parallel to each other; disposing a second electrode bar on the second conductive layer of the fingerprint sensing panel, wherein the long axis direction of the second electrode bar is different from the long axis direction of the first electrode bar, and the first electrode bar spans the second electrode bar; disposing a third electrode bar on the second conductive layer, wherein the long axis direction of the third electrode bar is the same as the long axis direction of the second electrode bar, and the first electrode bar spans the third electrode bar; disposing a plurality of fingerprint sensing electrodes on the second conductive layer, wherein the fingerprint sensing electrodes are between the second electrode bars and the third electrode bars, wherein the first electrode bars span the fingerprint sensing electrodes; in the touch detection mode, touch detection is performed by using the first electrode bar, the second electrode bar, and the third electrode bar; and in the fingerprint sensing mode, fingerprint sensing is performed by using the fingerprint sensing electrode.
Based on the above, the second conductive layer of the fingerprint sensing panel according to embodiments of the present invention has a fingerprint sensing electrode, a second electrode bar and a third electrode bar. The fingerprint sensing electrode is between the second electrode bar and the third electrode bar. In the fingerprint sensing mode, fingerprint sensing electrodes may be used for fingerprint sensing. The first electrode bar spans the second electrode bar and the third electrode bar. In the touch detection mode, the first electrode bar, the second electrode bar and the third electrode bar can be used for touch detection. Therefore, the fingerprint sensing panel has a touch detection function and a fingerprint sensing function.
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a schematic diagram of a circuit (circuit) of a fingerprint sensing panel according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method of operating a fingerprint sensing panel according to an embodiment of the invention;
FIG. 3 is a schematic diagram illustrating a layout structure of the electrode strip and the fingerprint sensing electrode shown in FIG. 1 according to an embodiment of the present invention;
FIG. 4 is a circuit diagram illustrating a photo-sensing unit according to an embodiment of the invention;
FIG. 5 is a schematic diagram illustrating a layout structure of the photo-sensing unit shown in FIG. 4 according to an embodiment of the invention.
Reference numerals illustrate:
100: fingerprint sensing panel
400: photo sensing unit
A1, A2, A3, A4, A5, B1, B2, B3: electrode strip
C11, C12, C13, C21, C22, C23, C31, C32, C33, C41, C42, C43, C51, C52, C53: fingerprint sensing electrode
G1, G2, G3, G4, G5, gn: gate line
L1, L2, L3, lm: light sensing line
PT4: optical thin film transistor
S1, S2 and S3: fingerprint sensing line
S210 to S250: step (a)
SW4: switch
Detailed Description
The term "coupled" as used throughout this specification (including the claims) may refer to any direct or indirect connection. For example, if a first device couples (or connects) to a second device, that connection may be through a direct connection, or through an indirect connection via other devices and connections. The terms first, second and the like in the description (including the claims) are used for naming the elements or distinguishing between different embodiments or ranges and are not used for limiting the number of elements, either upper or lower, or the order of the elements. In addition, wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts. Elements/components/steps in different embodiments that use the same reference numerals or use the same language may be referred to in relation to each other.
Fig. 1 is a schematic diagram of a circuit (circuit) of a fingerprint sensing panel 100 according to an embodiment of the present invention. The fingerprint sensing panel 100 shown in fig. 1 includes electrode strips A1, A2, A3, A4 and A5 arranged on a first conductive layer (e.g. an upper electrode layer or other layer). The fingerprint sensing panel 100 further comprises electrode bars B1, B2 and B3 arranged on a second conductive layer (e.g. a lower electrode layer or other layers). The long axis directions of the electrode bars A1 to A5 are identical to each other (i.e., parallel to each other). The long axis directions of the electrode bars B1 to B3 are identical to each other (i.e., parallel to each other). The long axis direction of the electrode bars B1 to B3 is different from the long axis direction of the electrode bars A1 to A5 so that the electrode bars A1 to A5 cross the electrode bars B1 to B3 as shown in fig. 1. In the touch detection mode, the electrode bars A1 to A5 and the electrode bars B1 to B3 may be used for touch detection.
The fingerprint sensing panel 100 further comprises fingerprint sensing electrodes C11, C12, C13, C21, C22, C23, C31, C32, C33, C41, C42, C43, C51, C52 and C53 arranged in the second conductive layer. The fingerprint sensing electrodes are arranged between the electrode bars B1-B3. For example, fingerprint sensing electrodes C12, C22, C32, C42 and C52 are arranged between electrode bar B1 and electrode bar B2, while fingerprint sensing electrodes C13, C23, C33, C43 and C53 are arranged between electrode bar B2 and electrode bar B3. Electrode strips A1-A5 also span fingerprint sensing electrodes C11-C53. In the fingerprint sensing mode, the fingerprint sensing electrodes C11-C53 may be used for fingerprint sensing.
The fingerprint sensing panel 100 shown in fig. 1 further comprises a plurality of switches, wherein a first end of any one of the switches is coupled to a corresponding one of the fingerprint sensing electrodes C11-C53, a control end of any one of the switches is coupled to a corresponding one of the gate lines G1, G2, G3, G4 and G5, and a second end of any one of the switches is coupled to the fingerprint sensing lines S1, S2 and S3. For example, the fingerprint sensing electrode C22 is coupled to the fingerprint sensing line S2 through a switch, and the control terminal of the switch is coupled to the gate line G2.
It should be noted that the fingerprint sensing panel 100 shown in fig. 1 is a partially enlarged schematic view of a complete sensing panel. The actual size of the fingerprint sensing electrodes C11-C53 and the density of the fingerprint sensing electrodes C11-C53 may be determined according to the resolution (design requirements) of the fingerprint sensing. The actual number of the fingerprint sensing electrodes C11-C53 may also be determined according to design requirements.
FIG. 2 is a flowchart of a method of operating a fingerprint sensing panel according to an embodiment of the invention. Please refer to fig. 1 and fig. 2. In step S210, electrode strips A1-A5 are disposed on a first conductive layer (e.g., an upper electrode layer or other layer), and electrode strips B1-B3 and fingerprint sensing electrodes C11-C53 are disposed on a second conductive layer (e.g., a lower electrode layer or other layer). The electrode strips A1-A5, the electrode strips B1-B3 and/or the fingerprint sensing electrodes C11-C53 may be made of transparent conductive material such as Indium Tin Oxide (ITO). Alternatively, the electrode strips A1-A5, the electrode strips B1-B3 and/or the fingerprint sensing electrodes C11-C53 may be metal mesh (metal mesh) made of nano silver wires or other metal materials.
Fig. 3 is a schematic diagram illustrating a layout structure of the electrode bars A2, B1, B2, C12, C22 and C32 shown in fig. 1 according to an embodiment of the invention. Electrode strip A2 is disposed on the first conductive layer, and electrode strip B1, electrode strip B2, fingerprint sensing electrode C12, fingerprint sensing electrode C22 and fingerprint sensing electrode C32 are disposed on the second conductive layer. Wherein an insulating layer (not shown) is provided between the first conductive layer and the second conductive layer. Electrode bar A2 spans electrode bar B1, fingerprint sensing electrode C22 and electrode bar B2.
Please refer to fig. 1 to 3. In step S220, the system may dynamically (or statically) define any area of the fingerprint sensing panel 100 as a touch detection area or a fingerprint sensing area. For example, in some applications, the system may be statically defined in a predetermined configuration as a fingerprint sensing area in a designated area of the fingerprint sensing panel 100, and other areas of the fingerprint sensing panel 100 are touch detection areas. In other examples, the system may dynamically define a fingerprint sensing area in a certain area of the fingerprint sensing panel 100 according to a gesture of a user, and a touch detection area in other areas of the fingerprint sensing panel 100. For example, when a finger of a user is pressed against a certain area of the fingerprint sensing panel 100 without moving, and the duration of the pressing is longer than a threshold time (e.g. 1 second or other time), the system may dynamically define the pressed area as a fingerprint sensing area, and the other areas as touch detection areas.
In step S230, the system can perform a corresponding operation mode for each region of the fingerprint sensing panel 100 according to what region is defined as the region. For example, when the system defines the fingerprint sensing panel 100 shown in fig. 1 as a touch detection area (the result of step S230 is "touch detection mode"), step S240 is performed. In the touch detection mode, the system may perform touch detection by using electrode bars A1 to A5 (first electrode bar) and electrode bars B1 to B3 (second electrode bar and third electrode bar) (step S240). The present embodiment does not limit the details of the touch detection. For example, the system may use conventional methods or other methods to detect touches on the electrode bars A1-A5 and the electrode bars B1-B3 according to design requirements.
For another example, when the system defines the fingerprint sensing panel 100 shown in fig. 1 as the fingerprint sensing area (the result of step S230 is "fingerprint sensing mode"), step S250 is performed. In the fingerprint sensing mode, the system may perform fingerprint sensing by using the fingerprint sensing electrodes C11 to C53 (step S250). In particular, the fingerprint sensing electrode C22 forms a capacitance (or capacitances) with its neighboring electrodes. For example, one capacitance is formed between the fingerprint sensing electrode C22 and the fingerprint sensing electrode C12 (or C32), another capacitance is formed between the fingerprint sensing electrode C22 and the electrode bar B1 (or B2), and another capacitance is formed between the fingerprint sensing electrode C22 and the electrode bar A2.
It is assumed herein that the fingerprint sensing panel 100 shown in fig. 1 (a partial range of the panel) is operated in a fingerprint sensing mode. When one of the current fingerprint sensing electrodes C11-C53 (e.g., fingerprint sensing electrode C22) is selected for fingerprint sensing, at least one corresponding one of the electrodes proximate to the current fingerprint sensing electrode C22 may be applied with a driving signal V for fingerprint sensing TX . For example (but not limited to), when the fingerprint sensing electrode C22 is selected for fingerprint sensing, the corresponding electrodes A2, B1, B2, C12 and C32 can be applied with the driving signal V for fingerprint sensing TX . By applying the driving signal V to the fingerprint sensing electrode C22 during fingerprint sensing TX The capacitance of the fingerprint sensing electrode C22 applied to adjacent ones of these electrodes can be effectively increased, thereby improving the sensing sensitivity.
The fingerprint sensing panel 100 shown in fig. 1 further includes a plurality of light sensing units for performing light detection. In the embodiment shown in FIG. 1, electrode strips B1-B3 span the light sensing cells. The output end of each of the light sensing units is coupled to a corresponding one of the light sensing lines L1, L2 and L3. The control terminal of each of the light sensing units is coupled to a corresponding one of the gate lines G1 to G5.
Fig. 4 is a circuit diagram illustrating a photo-sensing unit 400 according to an embodiment of the invention. Each of these light sensing units shown in fig. 1 can be analogized with reference to the associated description of light sensing unit 400 shown in fig. 4. The output terminal of the photo-sensing unit 400 shown in fig. 4 is coupled to the photo-sensing line Lm, and the control terminal of the photo-sensing unit 400 is coupled to the gate line Gn. The light sensing line Lm may be one of the light sensing lines L1 to L3 shown in fig. 1, and the gate line Gn may be one of the gate lines G1 to G5 shown in fig. 1.
Fig. 5 is a schematic diagram illustrating a layout structure of the light sensing unit 400 shown in fig. 4 according to an embodiment of the invention. Please refer to fig. 4 and fig. 5. The photo sensing unit 400 includes a switch SW4 and a photo thin film transistor (photo TFT) PT4. The switch SW4 and the optical thin film transistor PT4 are conventional devices, and are not described herein. The first end of the switch SW4 is coupled to the light sensing line Lm. The control terminal of the switch SW4 is coupled to the gate line Gn. The optical thin film transistor PT4 is coupled to the second terminal of the switch SW 4. The optical thin film transistor PT4 may sense light. The light sensing units 400 distributed at different positions of the fingerprint sensing panel 100 can sense the position and the range of the light to be blocked. When the light irradiates the light thin film transistor PT4, the sensing result of the light thin film transistor PT4 may be transmitted to the system through the switch SW 4. Therefore, the system can determine the finger position according to the light sensing units 400 distributed at different positions of the fingerprint sensing panel 100.
In summary, the second conductive layer of the fingerprint sensing panel 100 according to embodiments of the present invention has fingerprint sensing electrodes C11-C53 and electrode bars B1-B3. Fingerprint sensing electrodes C11-C53 are arranged between these electrode strips B1-B3. In the fingerprint sensing mode, the fingerprint sensing electrodes C11-C53 may be used for fingerprint sensing. Electrode strips A1-A5 span electrode strips B1-B3. In the touch detection mode, the electrode bars A1 to A5 and the electrode bars B1 to B3 may be used for touch detection. Therefore, the fingerprint sensing panel 100 has a touch detection function and a fingerprint sensing function. Furthermore, when one of the fingerprint sensing electrodes C11-C53 (e.g., fingerprint sensing electrode C22) is selected for fingerprint sensing, the corresponding electrodes A2, B1, B2, C12 and/or C32 adjacent to the current fingerprint sensing electrode C22 may be applied with a driving signal V for fingerprint sensing TX . By applying the driving signal V to the fingerprint sensing electrode C22 during fingerprint sensing TX The capacitance of the fingerprint sensing electrode C22 applied to adjacent ones of these electrodes can be effectively increased, thereby improving the sensing sensitivity.
Although the invention has been described with reference to the above embodiments, it should be understood that the invention is not limited thereto, but rather may be modified or altered somewhat by persons skilled in the art without departing from the spirit and scope of the invention.
Claims (8)
1. A fingerprint sensing panel, the fingerprint sensing panel comprising:
a plurality of first electrode strips arranged on the first conductive layer, wherein the first electrode strips are parallel to each other;
the second electrode strips are configured on the second conductive layer, wherein the long axis direction of the second electrode strips is different from the long axis direction of the first electrode strips, and the first electrode strips span the second electrode strips;
a third electrode bar disposed on the second conductive layer, wherein a long axis direction of the third electrode bar is the same as the long axis direction of the second electrode bar, the plurality of first electrode bars span the third electrode bar, and the plurality of first electrode bars, the second electrode bar and the third electrode bar are used for touch detection in a touch detection mode; and
a plurality of fingerprint sensing electrodes disposed on the second conductive layer and between the second electrode bars and the third electrode bars, wherein the plurality of first electrode bars span the plurality of fingerprint sensing electrodes, the plurality of fingerprint sensing electrodes being used for fingerprint sensing in a fingerprint sensing mode,
wherein when a current fingerprint sensing electrode of the plurality of fingerprint sensing electrodes is selected for the fingerprint sensing, at least one of the second electrode bar and the third electrode bar adjacent to the current fingerprint sensing electrode is applied with a driving signal for the fingerprint sensing.
2. The fingerprint sensing panel of claim 1, further comprising:
a plurality of switches, wherein a first end of any of the plurality of switches is coupled to a corresponding fingerprint sensing electrode of the plurality of fingerprint sensing electrodes, a control end of any of the plurality of switches is coupled to a corresponding gate line of the plurality of gate lines, and a second end of any of the plurality of switches is coupled to a fingerprint sensing line.
3. The fingerprint sensing panel of claim 1, wherein when the present fingerprint sensing electrode of the plurality of fingerprint sensing electrodes is selected for the fingerprint sensing, a corresponding first electrode bar of the plurality of first electrode bars proximate to the present fingerprint sensing electrode is applied the drive signal for the fingerprint sensing, the corresponding first electrode bar crossing the present fingerprint sensing electrode.
4. The fingerprint sensing panel of claim 1, wherein when the present fingerprint sensing electrode of the plurality of fingerprint sensing electrodes is selected for the fingerprint sensing, at least one corresponding fingerprint sensing electrode of the plurality of fingerprint sensing electrodes that is proximate to the present fingerprint sensing electrode is applied with the drive signal for the fingerprint sensing.
5. The fingerprint sensing panel of claim 1, further comprising:
a plurality of light sensing units configured to perform light detection, wherein the second electrode bar spans the plurality of light sensing units, and any one of the plurality of light sensing units includes:
a switch having a first end coupled to the light sensing line, wherein a control end of the switch is coupled to the gate line; and
an optical thin film transistor is coupled to the second end of the switch.
6. A method of operating a fingerprint sensing panel, the method comprising:
disposing a plurality of first electrode strips on the first conductive layer of the fingerprint sensing panel, wherein the plurality of first electrode strips are parallel to each other;
configuring a second electrode strip on a second conductive layer of the fingerprint sensing panel, wherein the long axis direction of the second electrode strip is different from the long axis direction of the first electrode strips, and the first electrode strips span the second electrode strip;
disposing a third electrode bar on the second conductive layer, wherein a long axis direction of the third electrode bar is the same as the long axis direction of the second electrode bar, and the plurality of first electrode bars span the third electrode bar;
disposing a plurality of fingerprint sensing electrodes on the second conductive layer, wherein the plurality of fingerprint sensing electrodes are between the second electrode bars and the third electrode bars, wherein the plurality of first electrode bars span the plurality of fingerprint sensing electrodes;
in the touch detection mode, touch detection is performed by using the plurality of first electrode bars, the second electrode bars, and the third electrode bars;
in the fingerprint sensing mode, fingerprint sensing is performed by using the plurality of fingerprint sensing electrodes; and
when a current fingerprint sensing electrode of the plurality of fingerprint sensing electrodes is selected for the fingerprint sensing, a driving signal to perform the fingerprint sensing is applied to at least one of the second electrode bar and the third electrode bar adjacent to the current fingerprint sensing electrode.
7. The method of operation of claim 6, further comprising:
when the current fingerprint sensing electrode of the plurality of fingerprint sensing electrodes is selected for the fingerprint sensing, the driving signal to perform the fingerprint sensing is applied to a corresponding first electrode bar of the plurality of first electrode bars that is proximate to the current fingerprint sensing electrode, wherein the corresponding first electrode bar spans the current fingerprint sensing electrode.
8. The method of operation of claim 6, further comprising:
when the current fingerprint sensing electrode of the plurality of fingerprint sensing electrodes is selected for the fingerprint sensing, the driving signal to perform the fingerprint sensing is applied to at least one corresponding fingerprint sensing electrode of the plurality of fingerprint sensing electrodes that is close to the current fingerprint sensing electrode.
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