CN110728265B - Fingerprint identification display panel and fingerprint identification display device - Google Patents
Fingerprint identification display panel and fingerprint identification display device Download PDFInfo
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- CN110728265B CN110728265B CN201911038884.9A CN201911038884A CN110728265B CN 110728265 B CN110728265 B CN 110728265B CN 201911038884 A CN201911038884 A CN 201911038884A CN 110728265 B CN110728265 B CN 110728265B
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- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
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Abstract
The invention discloses a fingerprint identification display panel and a fingerprint identification display device, comprising a scanning circuit, wherein the scanning circuit comprises: the display device comprises a plurality of cascaded scanning units, wherein each scanning unit comprises a shift register and a display output module connected with the output end of the shift register, and the display output module is used for scanning a gate line in a display stage; at least part of the scanning units also comprise a fingerprint identification output module connected with the output end of the shift register, and the fingerprint identification output module is used for scanning the fingerprint identification unit in a fingerprint identification stage. The invention can effectively reduce the frames of the fingerprint identification display panel and the fingerprint identification display device.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of display, in particular to a fingerprint identification display panel and a fingerprint identification display device comprising the same.
[ background of the invention ]
The fingerprint of a human body has uniqueness and invariance, so that the safety performance of fingerprint identification is stronger, and meanwhile, the fingerprint identification is simple to operate, so that the fingerprint identification is widely applied to various fields, such as the technical field of display. In the field of display technology, taking a mobile phone as an example, when the mobile phone is unlocked or a specific application program of the mobile phone is opened, the operation can be completed through fingerprint identification.
However, fingerprint identification needs to add the fingerprint identification drive circuit connected with the corresponding fingerprint identification sensing unit, and in the prior art, the fingerprint identification drive circuit is arranged in the frame area of the display device. However, the frame region of the display device is further provided with the gate driving circuit for driving the display, and then the fingerprint identification driving circuit is arranged in the frame region of the display device, so that the width of the frame of the display device is increased, the development trend of narrow frames is not met, and meanwhile, the distribution of the gate driving circuit for driving the display is influenced, and further the display effect of the display device is possibly influenced.
[ summary of the invention ]
In order to solve the above technical problems, the present invention provides a fingerprint identification display panel and a fingerprint identification display device including the fingerprint identification display panel.
In a first aspect, the present invention provides a fingerprint identification display panel, including a scanning circuit, where the scanning circuit includes: the display device comprises a plurality of cascaded scanning units, wherein each scanning unit comprises a shift register and a display output module connected with the cascade end of the shift register, and the display output module is used for scanning a gate line in a display stage; at least part of the scanning units also comprise a fingerprint identification output module connected with the cascade end of the shift register, and the fingerprint identification output module is used for scanning the fingerprint identification unit in a fingerprint identification stage.
In a second aspect, an embodiment of the present invention further provides a fingerprint identification display apparatus, including the fingerprint identification display panel provided in the first aspect.
Compared with the prior art, the fingerprint identification display panel and the fingerprint identification display device provided by the embodiment of the invention have the advantages that at least part of the shift registers for displaying are connected to the fingerprint identification output module, the fingerprint identification output module is used for scanning the fingerprint identification unit in the fingerprint identification stage, namely, at least part of units in the grid drive circuit for driving display are multiplexed into the fingerprint identification drive circuit, the fingerprint identification drive circuit is not required to be additionally arranged, and the frames of the fingerprint identification display panel and the fingerprint identification display device can be greatly reduced.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic top view of a fingerprint recognition real panel according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a shift register according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a fingerprint identification unit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a connection structure of two scanning units in another fingerprint identification display panel according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of another exemplary embodiment of a fingerprint identification unit and a circuit configuration of the output terminal of the fingerprint identification unit;
FIG. 6 is a timing signal diagram for each port of the circuit configuration shown in FIG. 5 in which the fingerprint identification unit and the output of the fingerprint identification unit are connected;
FIG. 7 is a timing signal diagram of a portion of the ports when the circuit configuration of the fingerprint identification unit shown in FIG. 5 and the output terminal of the fingerprint identification unit is applied to FIG. 4;
FIG. 8 is a schematic diagram of a scan circuit distribution of a fingerprint identification display panel according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a scan circuit distribution of another fingerprint identification display panel according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a fingerprint identification display device according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used herein to describe devices in accordance with embodiments of the present invention, these devices should not be limited by these terms. These terms are only used to distinguish one device from another. For example, a first device may also be referred to as a second device, and similarly, a second device may also be referred to as a first device, without departing from the scope of embodiments of the present invention.
In view of the problems in the fingerprint recognition display device mentioned in the background section, an embodiment of the present invention provides a fingerprint recognition display panel, including a scan circuit, the scan circuit including: the cascade-connected scanning units comprise a shift register and a display output module connected with the cascade end of the shift register, and the display output module is used for scanning the gate line in the display stage; at least part of the scanning units also comprise a fingerprint identification output module connected with the cascade end of the shift register, and the fingerprint identification output module is used for scanning the fingerprint identification unit in a fingerprint identification stage.
Referring to fig. 1, fig. 1 is a schematic top view of a fingerprint identification display panel according to an embodiment of the present invention, the fingerprint identification display panel includes a display area AA and a non-display area NA surrounding the display area AA, a scanning circuit 100 is disposed in the non-display area NA, the scanning circuit 100 includes a plurality of cascaded scanning units 1000, each scanning unit 1000 includes a shift register 110 and a display output module 120 connected to a cascaded end of the shift register 110, and the display output module 120 is configured to scan a gate line 140 in a display stage; at least part of the scanning units 1000 further includes a fingerprint identification output module 130 connected to the NEXT at the cascade end of the shift register 110, the fingerprint identification output module 130 is used for scanning the fingerprint identification units 150 during the fingerprint identification stage, and each fingerprint identification output module 130 can be simultaneously connected to a plurality of fingerprint identification units 150, i.e. each fingerprint identification output module 130 can simultaneously scan a plurality of fingerprint identification units 150. For ease of understanding, the shift register 110 not connected to the fingerprinting output module 130 is labeled 110a in fig. 1, and the shift register 110 connected to the display output module 120 and the fingerprinting output module 130 is labeled 110 b.
It should be noted that IN the scanning circuit 100 according to the embodiment of the present invention, except for the first scanning unit 1000, the input terminal IN of the shift register 110 of each scanning unit 1000 is connected to the cascade terminal NEXT of the shift register 110 of the previous scanning unit 1000, and the input terminal IN of the shift register 110 of the first scanning unit 1000 is connected to the start trigger signal terminal STV.
Compared with the prior art, the fingerprint identification display panel provided by the embodiment of the invention has the advantages that at least part of the shift register 110 for displaying is connected to the fingerprint identification output module 130, the fingerprint identification output module 130 is used for scanning the fingerprint identification unit 150 in a fingerprint identification stage, namely, at least part of units in the gate driving circuit for driving display are multiplexed into the fingerprint identification driving circuit, the fingerprint identification driving circuit does not need to be additionally arranged, and the frame of the fingerprint identification display panel can be greatly reduced.
Referring to fig. 1, optionally, the display output module 120 includes a first logic module 1200 and a first signal terminal CKV1 or CKV2, a first terminal of the first logic module 1200 is connected to the output terminal of the shift register 110, a second terminal of the first logic module 1200 is connected to the first signal terminal CKV1 or CKV2, and an output terminal of the first logic module 1200 is connected to the gate line 140. Specifically, in this embodiment, the first signal terminal of the odd-numbered scan cells 1000 is CKV1, and the first signal terminal of the even-numbered scan cells 1000 is CKV 2. In other alternative embodiments of the present invention, the first signal terminal of the odd-numbered scan cells 1000 is CKV2, and the first signal terminal of the even-numbered scan cells 1000 is CKV 1.
Optionally, in this embodiment, the fingerprint identification output module 130 includes only one fingerprint identification output sub-module 130 ', each fingerprint identification output sub-module 130' includes a second logic module 1300 and a second signal terminal CLK, a first terminal of the second logic module 1300 is connected to the cascade terminal NEXT of the shift register 110, a second terminal of the second logic module 1300 is connected to the second signal terminal CLK, and an output terminal of the second logic module 1300 is connected to the selection control terminal SEL of the fingerprint identification unit 150.
Further, in this embodiment, the effective output signal of the shift register 110 may be a high level signal, the first logic module 1200 may include a first nand gate 1201 and a first inverter module 1202, a first end of the first nand gate 1201 is connected to the output end of the shift register 110, a second end of the first nand gate 1201 is connected to the first signal terminal CKV1 or CKV2, an output end of the first nand gate 1201 is connected to the input end of the first inverter module 1202, and an output end of the first inverter module 1202 is connected to the gate line 140; the second logic module 1300 may include a second nand gate 1301 and a second inverter module 1302, wherein a first end of the second nand gate 1301 is connected to the output end of the shift register 110, a second end of the second nand gate 1301 is connected to the second signal end CLK, an output end of the second nand gate 1301 is connected to the input end of the second inverter module 1302, and an output end of the second inverter module 1302 is connected to the selection control end SEL of the fingerprint identification unit 150.
On this basis, since the nand gate needs to output a valid low level signal by inputting a high level signal at both input ends, that is, the output end of the shift register 110 needs to output a high level signal, and the second signal end CLK outputs a low level signal when inputting a high level signal, the second ends of the fingerprint identification output sub-modules 130' of different fingerprint identification output modules 130 can be connected to the same second signal end CLK, so that the number of wires for transmitting signals for the second signal ends can be reduced without affecting the line-by-line scanning driving of the fingerprint identification unit 150, the space of the non-display area NA of the fingerprint identification display panel can be saved, and the reduction of the frame of the fingerprint identification display panel is facilitated.
The signal output by the first inverter module 1202 is used for scanning the gate line 140 in the display stage, and needs to drive the display of a whole row of sub-pixels, so that, in order to enhance the driving capability of the scanning signal, the first inverter module 1202 may include at least three inverters connected in series; the signal output by the second inverter block 1302 is used to scan the fingerprint recognition elements 150 during the fingerprint recognition stage, the number of fingerprint recognition elements is typically much smaller than the number of sub-pixels, and therefore, the second inverter block 1302 may comprise only one inverter to reduce the area required by the scanning circuit 100.
Referring to fig. 2, fig. 2 is a schematic circuit diagram of a shift register according to an embodiment of the present invention, where the shift register 110 includes: a first inverter M1, an input terminal of which is connected to the clock signal terminal CKV of the shift register 110; a first tristate gate P1, whose input terminal is connected to the input terminal IN of the shift register 110, whose first clock input terminal CP1 is connected to the output terminal of the first inverter M1, and whose second clock input terminal CN1 is connected to the clock signal terminal CKV of the shift register 110; a second tristate gate P2, having a first clock input CP2 connected to the clock signal terminal CKV of the shift register 110, a second clock input CN2 connected to the output terminal of the first inverter M1, an output terminal connected to the output terminal of the first tristate gate P1, and an input terminal connected to the cascade terminal NEXT of the shift register 110; the second inverter M2 has its input terminal connected to the P1 output terminal of the first tri-state gate, and its output terminal connected to the cascade terminal NEXT of the shift register 110. The shift register 110 can be used in the fingerprint identification display panel shown in fig. 1, at this time, if the first signal terminal of the odd-numbered scan cells 1000 is CKV1, and the first signal terminal of the even-numbered scan cells 1000 is CKV2, the clock signal terminal CKV of the shift register 110 of the odd-numbered scan cells 1000 and the first signal terminal CKV2 of the even-numbered scan cells 1000 receive the same clock signal, and the clock signal terminal CKV of the shift register 110 of the even-numbered scan cells 1000 and the first signal terminal CKV1 of the odd-numbered scan cells 1000 receive the same clock signal.
Referring to fig. 3, fig. 3 is a specific circuit diagram of a fingerprint identification unit according to an embodiment of the present invention, where the fingerprint identification unit may include a photodiode D, a storage capacitor C, a transistor T, a selection control terminal SEL, a reference voltage signal terminal Vbias, and an output terminal Vout. The anode of the photodiode D is electrically connected with the first polar plate of the storage capacitor C and the reference voltage signal end Vbias, the cathode of the photodiode D is connected with the second polar plate of the storage capacitor C and the first stage of the transistor T, and the node E is arranged at the connection position; the gate of the transistor T is electrically connected to the selection control terminal SEL, and the second pole of the transistor T is electrically connected to the output terminal Vout. In the fingerprinting phase, the signal terminal Vbias may access a low level signal (e.g., a constant voltage signal of magnitude-5V). The fingerprint identification phase comprises a preparation phase, a signal acquisition phase and a signal detection phase. In the preparation stage, the selection control terminal SEL controls the transistor T to be conducted, and the storage capacitor C is charged until the storage capacitor C is charged. In the signal acquisition stage, the selection control terminal SEL controls the transistor T to be turned off. When a user presses a finger on the fingerprint identification display panel, light emitted by the fingerprint identification light source irradiates the finger and is reflected on the surface of the finger fingerprint to form reflected light. The reflected light formed by the reflection of the finger fingerprint is incident into the fingerprint recognition unit 150, is received by the photodiode D of the fingerprint recognition unit 150, and forms a photocurrent, thereby changing the potential of the node E. In the signal detection stage, the potential variation of the node E can be directly detected, and the magnitude of the photocurrent can be further determined.
In the above-mentioned fingerprint identification display panel shown in fig. 1, the fingerprint identification output module 130 includes only one fingerprint identification output sub-module 130', and in another alternative embodiment of the present invention, the fingerprint identification output module may include a plurality of fingerprint identification output sub-modules, each of the fingerprint identification output sub-modules includes a second logic module and a second signal terminal, a first terminal of the second logic module is connected to the output terminal of the shift register, and a second terminal of the second logic module is connected to the second signal terminal.
On the basis, the fingerprint identification unit can comprise N selection control ends, correspondingly, the fingerprint identification output module comprises N fingerprint identification output sub-modules, and the output ends of the N fingerprint identification output sub-modules are respectively connected with the N selection control ends; in the same fingerprint identification output module, the second ends of the second logic modules of the N fingerprint identification output sub-modules are respectively connected with different second signal ends, wherein N is an integer greater than 1, so that signals output by the ground output ends of the different fingerprint identification output sub-modules in the same fingerprint identification output module can control different selection control ends in the fingerprint identification unit.
Furthermore, N fingerprint identification output sub-modules of the fingerprint identification output module are 1 st to Nth fingerprint identification output sub-modules; the second end of the ith fingerprint identification output submodule of each fingerprint identification output module is connected with the same second signal end, wherein i is an integer and is not less than 1 and not more than N, so that the number of wires for transmitting signals for the second signal end can be reduced under the condition of not influencing the progressive scanning driving of the fingerprint identification unit, the space of a non-display area of the fingerprint identification display panel can be saved, and the frame of the fingerprint identification display panel can be further reduced.
Next, N is 3 as an example. Referring to fig. 4, fig. 4 is a schematic diagram of a connection structure of two scan cells in another fingerprint identification display panel according to an embodiment of the present invention, in which for convenience of understanding, only two scan cells 1000 in a scan circuit are illustrated, each of the two scan cells 1000 includes a fingerprint identification output module 130 connected to a cascade terminal of a shift register 110, and here, the cascade terminals of the shift register 110 of the two scan cells 1000 are labeled as NEXT1 and NEXT2, respectively. In this embodiment, the circuit structures of the display output module 120 and the fingerprint identification output sub-module 130 'may be the same as the circuit structures of the display output module 120 and the fingerprint identification output sub-module 130' in fig. 1, and are not repeated herein.
When N is equal to 3, the fingerprint identification unit 150 includes 3 selection control terminals, the fingerprint identification output module 130 includes 3 fingerprint identification output sub-modules 130 ', output terminals of the 3 fingerprint identification output sub-modules 130' are respectively connected to the 3 selection control terminals, and the 3 selection control terminals are respectively a first selection control terminal TX, a second selection control terminal RST and a third selection control terminal SEL.
It should be noted that, in this embodiment, the circuit structure of the shift register 110 may be the same as the shift register 110 shown in fig. 2, and the connection relationship of the shift registers 110 of the adjacent scanning units 1000 may be the same as that in the scanning circuit 100 shown in fig. 1, and is not described here again.
In an alternative implementation manner, please refer to fig. 5, where fig. 5 is a schematic diagram of a circuit structure of another fingerprint identification unit and a connection between an output terminal of the fingerprint identification unit according to an embodiment of the present invention, where the fingerprint identification unit 150 may specifically include: the photodiode D, the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the storage capacitor C, the first selection control terminal TX, the second selection control terminal RST, the third selection control terminal SEL, the reference voltage signal terminal Vbias, the driving voltage signal terminal VDD, and the signal output terminal Vout, wherein the anode of the photodiode D is connected to the reference voltage signal terminal Vbias, and the cathode of the photodiode D is connected to the first node E1; a gate of the first transistor T1 is connected to the first selection control terminal TX, a first pole of the first transistor T1 is connected to the first node E1, and a second pole of the first transistor T1 is connected to the second node E2; a gate of the second transistor T2 is connected to the second selection control terminal RST, a first pole of the second transistor T2 is connected to the second node E2, and a second pole of the second transistor T1 is connected to the driving voltage signal terminal VDD; a gate electrode of the third transistor T3 is connected to the second node E2, a first pole of the third transistor T3 is connected to a first pole of the fourth transistor T4, and a second pole of the third transistor T3 is connected to the driving voltage signal terminal VDD; a gate of the fourth transistor T4 is connected to the third selection control terminal SEL, and a second pole of the fourth transistor T4 is connected to the signal output terminal Vout; the first plate of the storage capacitor C is connected to the second node E2, and the second plate of the storage capacitor C is connected to the reference voltage signal terminal Vbias.
It should be noted that, in this embodiment, the signal output terminal Vout of the fingerprint identification unit 150 may be connected to the selection module 160, so as to selectively export the signal output by the fingerprint identification unit 150 to the signal processing unit, thereby reducing the influence of noise signals. Specifically, the selection module 160 may include a first selection transistor T5, a second selection transistor T6, a noise read control terminal Cds-N, and a signal read control terminal Cds-S; a gate of the first selection transistor T5 is connected to the noise reading control terminal Cds-N, a first pole of the first selection transistor T5 is connected to the signal output terminal Vout of the fingerprint recognition unit 150, and a second pole of the first selection transistor T5 is connected to the signal processing unit; the gate of the second selection transistor T6 is connected to the signal read control terminal Cds-S, the first pole of the second selection transistor T6 is connected to the signal output terminal Vout of the fingerprint recognition unit 150, and the second pole of the second selection transistor T6 is connected to the signal processing unit. Here, the signal processing unit is not shown in the figure, and is configured to process the read signal output by the fingerprint identification unit 150, and may be integrated in a driving chip of the fingerprint identification display panel, which is not described herein again.
The operation of the fingerprint recognition unit 150 shown in fig. 5 will be explained with reference to the timing chart. Referring to fig. 6, fig. 6 is a timing signal diagram corresponding to each port of the circuit structure in which the fingerprint identification unit shown in fig. 5 and the output terminal of the fingerprint identification unit are connected. In conjunction with fig. 5 and 6, the fingerprint recognition phase includes a reset phase t1, an exposure phase t2, a charge transfer phase t4, and a signal output phase t 5.
In the reset period T1, the second selection control terminal RST is turned on by the second transistor T2, the driving voltage signal of the driving voltage signal terminal VDD is transmitted to the second node E2, and the first selection control terminal TX controls the first transistor T1 to be turned on.
In the exposure period T2, the first selection control terminal TX controls the first transistor T1 to turn off, the second selection control terminal RST controls the second transistor T2 to turn on, and the photodiode D generates the charge Q under the action of light and transmits the charge Q to the first node E1.
In the charge transfer phase T4, the first selection control terminal TX controls the first transistor T1 to be turned on, the second selection control terminal RST is controlled by the second transistor T2 to be turned off, and the charge Q at the first node E1 is completely transferred to the second node E2.
In the signal output stage T5, the first selection control terminal TX controls the first transistor T1 to be turned off, the second node E2 controls the third transistor T3 to be turned on, and the third selection control terminal SEL controls the fourth transistor T4 to be turned on, so as to transmit the fingerprint identification signal to the signal output terminal Vout.
In addition, to reduce the influence of the noise signal, a noise output stage T3 may be further included after the exposure stage T2 before the charge transfer stage T4, in which the first transistor T1 is kept turned off, the second selection control terminal RST controls the second transistor T2 to be turned off, the third selection control terminal SEL controls the fourth transistor T4 to be turned on, and the noise signal is transmitted to the signal output terminal Vout.
In the noise output stage T3, the noise reading control terminal Cds-N controls the first selection transistor T5 to be turned on, and the noise signal is transmitted to the signal processing unit; in the signal output stage T5, the signal reading control terminal Cds-S controls the second selection transistor T6 to be turned on, and the fingerprint identification signal is transmitted to the signal processing unit.
Referring next to fig. 7, fig. 7 is a timing signal diagram of a portion of ports when the circuit configuration of the fingerprint identification unit shown in fig. 5 and the output terminal of the fingerprint identification unit are applied to fig. 4, which exemplarily shows timing signals of two display frames. With reference to fig. 4, 5 and 7, in the present embodiment, the second terminals of the second logic modules 1300 of the 3 fingerprint identification output sub-modules 130' are respectively connected to 3 different second signal terminals, and the 3 different second signal terminals are respectively a first sub-signal terminal TX-CLK, a second sub-signal terminal RST-CLK and a third sub-signal terminal SEL-CLK. The signals of the first signal terminals CKV1 and CKV2 are matched with the signals of the second signal terminals (the first sub-signal terminal TX-CLK, the second sub-signal terminal RST-CLK and the third sub-signal terminal SEL-CLK) to realize driving of the fingerprint identification unit 150.
Similarly, in this embodiment, the second ends of the ith fingerprint identification output sub-modules 130' of the different fingerprint identification output modules 130 are connected to the same second signal end, where i is an integer and is not less than 1 and not more than 3, so that the number of traces for transmitting signals for the second signal end can be reduced without affecting the line-by-line scanning driving of the fingerprint identification unit 150, the space of the non-display area of the fingerprint identification display panel can be saved, and the frame of the fingerprint identification display panel can be further reduced.
Optionally, the effective signal of the first signal terminal and the effective signal of the second signal terminal are not overlapped to separate the display stage from the fingerprint identification stage, so that the displayed signal and the fingerprint identification signal are prevented from interfering with each other, and the display and fingerprint identification effects are improved.
Referring to fig. 7, in the present embodiment, the noise output stage t3 and the signal output stage t5 are located in the same display frame. In other alternative embodiments of the present invention, the noise output stage and the signal output stage may be located in different display frames. Because the effective signal of the first signal terminal and the effective signal of the second signal terminal are not overlapped, the effective signal of the second signal terminal can only be positioned between two adjacent effective signals of the first signal terminal, so that the duration of the effective signal of each section of the second signal terminal is very short, and therefore, in order to enable the fingerprint identification unit to have more sufficient signal reading time, a noise output stage and a signal output stage can be arranged in different display frames. Further, the noise output stage and the signal output stage may be located in adjacent display frames, or may be located in non-adjacent display frames, which is not limited herein.
It should be noted here that the fingerprint identification phase including the noise output phase and the signal output phase is described by taking the embodiment corresponding to fig. 4 and 5 as an example, the fingerprint identification unit 150 includes 3 selection control terminals, and the fingerprint identification output module 130 includes 3 fingerprint identification output sub-modules 130', but not limited thereto, and in an actual application process, for the fingerprint identification units including other numbers of selection control terminals and the fingerprint identification output modules including other numbers of fingerprint identification output sub-modules, the fingerprint identification phase may also include the noise output phase and the signal output phase, which is not described herein again.
On the basis of the above embodiments, in order to further improve the accuracy of fingerprint identification, a plurality of display frames may be used to complete a report of one fingerprint identification, that is, each display frame completes reading of a partial fingerprint identification signal, and a plurality of display frames complete a complete fingerprint identification signal.
It should be noted that the area of the fingerprint identification display panel for implementing fingerprint identification is a fingerprint identification area, and the fingerprint identification unit in the above embodiments is located in the fingerprint identification area. The fingerprint identification area can be partially overlapped with the display area, and the partial fingerprint identification function of the full-screen display panel can be realized through the fingerprint identification area. In this case, the fingerprint recognition function can be implemented in one-fourth, one-half or any other arbitrary ratio of the display area, which is not specifically limited by the present invention. For example, taking half of the display area to implement the fingerprint identification function as an example, referring to fig. 8, fig. 8 is a distribution diagram of a scanning circuit of the fingerprint identification display panel according to an embodiment of the present invention, in this embodiment, half of the display area AA implements the fingerprint identification function, the scanning circuit 100 is distributed in the non-display area NA on two opposite sides of the display area AA, as shown in the figure, an output terminal of a shift register (not shown in the figure) in the scanning unit 1000 marked as 1000b is connected to a display output module (not shown in the figure) and a fingerprint identification output module (not shown in the figure), an output terminal of a shift register (not shown in the figure) in the scanning unit 1000 marked as 1000a is connected to the display output module (not shown in the figure), but is not connected to the fingerprint identification output module, half of the scanning unit 1000 is 1000a, and the other half of the scanning unit 1000 is 1000 b. Certainly, the fingerprint identification area also can overlap completely with the display area, and the fingerprint identification unit is covered with the display area promptly, and finger touch all can trigger the fingerprint identification unit and carry out fingerprint identification in arbitrary position on the screen, realizes full-screen fingerprint identification function, makes fingerprint identification's precision higher convenient and fast. At this time, all the scanning units include a fingerprint identification output module connected to the output end of the shift register. Referring to fig. 9, fig. 9 is a schematic diagram of a distribution of scanning circuits of another fingerprint identification display panel according to an embodiment of the present invention, in this embodiment, the entire display area AA can implement a fingerprint identification function, and the scanning circuits 100 are distributed in the non-display areas NA on two opposite sides of the display area AA, as shown in the figure, output ends of shift registers (not shown in the figure) in all the scanning units 1000 are connected to a display output module (not shown in the figure) and a fingerprint identification output module (not shown in the figure).
Based on the same inventive concept, an embodiment of the present invention further provides a fingerprint identification display device, fig. 10 is a schematic structural diagram of the fingerprint identification display device provided in the embodiment of the present invention, and referring to fig. 10, the fingerprint identification display device includes the display panel 200 provided in any of the above embodiments of the present invention, and may further include structures such as a backlight module, which are not shown in fig. 10, and are not described again here. The light source for fingerprint identification may be disposed on the backlight module, but the present invention is not limited thereto. In this embodiment, the fingerprint identification display device is a mobile phone, and in other optional embodiments of the present invention, the fingerprint identification display device may be any device having display and fingerprint identification functions, such as a tablet computer and a notebook computer.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (12)
1. A fingerprint identification display panel comprising a scanning circuit, wherein the scanning circuit comprises:
the display device comprises a plurality of cascaded scanning units, wherein each scanning unit comprises a shift register and a display output module connected with the cascade end of the shift register, and the display output module is used for scanning a gate line in a display stage;
at least part of the scanning units also comprise a fingerprint identification output module connected with the cascade end of the shift register, and the fingerprint identification output module is used for scanning the fingerprint identification unit in a fingerprint identification stage;
the fingerprint identification output module comprises at least one fingerprint identification output submodule, each fingerprint identification output submodule comprises a second logic module and a second signal end, the first end of the second logic module is connected with the output end of the shift register, and the second end of the second logic module is connected with the second signal end;
wherein the content of the first and second substances,
each fingerprint identification unit comprises a selection control end, each fingerprint identification output module only comprises a fingerprint identification output submodule, and the output end of the fingerprint identification output submodule is connected with the selection control end;
alternatively, the first and second electrodes may be,
the fingerprint identification unit comprises N selection control terminals, the fingerprint identification output module comprises N fingerprint identification output sub-modules, and the output ends of the N fingerprint identification output sub-modules are respectively connected with the N selection control terminals; in the same fingerprint identification output module, the second ends of the second logic modules of the N fingerprint identification output sub-modules are respectively connected with different second signal ends, wherein N is an integer greater than 1.
2. The fingerprint identification display panel of claim 1, wherein the display output module comprises a first logic module and a first signal terminal, the first terminal of the first logic module is connected to the output terminal of the shift register, and the second terminal of the first logic module is connected to the first signal terminal.
3. The fingerprint recognition display panel of claim 2, wherein when the fingerprint recognition unit includes one selection control terminal, the fingerprint recognition unit further includes a photodiode, a storage capacitor, a transistor, a reference voltage signal terminal, and an output terminal;
the positive pole of the photodiode is electrically connected with the first polar plate of the storage capacitor and the reference voltage signal end, the negative pole of the photodiode is connected with the second polar plate of the storage capacitor and the first pole of the transistor, the grid of the transistor is electrically connected with the control signal end, and the second pole of the transistor is electrically connected with the output end.
4. The fingerprint identification display panel of claim 2, wherein the N fingerprint identification output sub-modules of the fingerprint identification output module are 1 st to nth fingerprint identification output sub-modules;
and second ends of ith fingerprint identification output sub-modules of different fingerprint identification output modules are connected with the same second signal end, wherein i is an integer and is more than or equal to 1 and less than or equal to N.
5. The panel of claim 2, wherein the fingerprint recognition unit includes 3 selection control terminals, the fingerprint recognition output module includes 3 fingerprint recognition output sub-modules, and the output terminals of the 3 fingerprint recognition output sub-modules are respectively connected to the 3 selection control terminals.
6. The fingerprint recognition display panel of claim 5,
the 3 selection control ends are respectively a first selection control end, a second selection control end and a third selection control end;
the fingerprint recognition unit further includes: the driving circuit comprises a photodiode, a first transistor, a second transistor, a third transistor, a fourth transistor, a storage capacitor, a reference voltage signal end, a driving voltage signal end and a signal output end;
the anode of the photodiode is connected with the reference voltage signal end, and the cathode of the photodiode is connected with a first node; the grid electrode of the first transistor is connected with the first selection control end, the first pole of the first transistor is connected with the first node, and the second pole of the first transistor is connected with the second node; the grid electrode of the second transistor is connected with the second selection control end, the first pole of the second transistor is connected with the second node, and the second pole of the second transistor is connected with the driving voltage signal end; a gate of the third transistor is connected to the second node, a first pole of the third transistor is connected to a first pole of the fourth transistor, and a second pole of the third transistor is connected to the driving voltage signal terminal; a gate of the fourth transistor is connected to the third selection control terminal, and a second pole of the fourth transistor is connected to the signal output terminal; the first plate of the storage capacitor is connected to the second node, and the second plate of the storage capacitor is connected to the reference voltage signal terminal.
7. The fingerprint recognition display panel of claim 2, wherein the first logic module comprises a first nand gate and a first inverter module, a first end of the first nand gate is connected to the output end of the shift register, and a second end of the first nand gate is connected to the first signal end;
the second logic module comprises a second NAND gate and a second inverter module, wherein the first end of the second NAND gate is connected with the output end of the shift register, and the second end of the second NAND gate is connected with the second signal end.
8. The fingerprint recognition display panel of claim 7, wherein the first inverter module comprises at least three inverters connected in series, and the second inverter module comprises one inverter.
9. The panel of claim 7, wherein the valid signal of the first signal terminal and the valid signal of the second signal terminal do not overlap.
10. The panel of claim 1, wherein all of the scan cells include a fingerprint output module coupled to an output of the shift register.
11. The fingerprinting display panel of any one of claims 1-10, wherein the fingerprinting stage includes a noise output stage and a signal output stage, the noise output stage and the signal output stage being located in different display frames.
12. A fingerprint recognition display device comprising the fingerprint recognition display panel according to any one of claims 1 to 11.
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| CN110867165B (en) | 2019-11-29 | 2021-10-15 | 厦门天马微电子有限公司 | Display panel and display device |
| CN111191634B (en) * | 2020-02-04 | 2022-10-11 | 厦门天马微电子有限公司 | Driving method of fingerprint identification circuit and fingerprint identification circuit |
| CN111428697B (en) * | 2020-05-27 | 2022-10-21 | 上海天马微电子有限公司 | Optical sensor circuit, detector, imaging system, sensor, and display panel |
| CN112766111B (en) * | 2021-01-08 | 2022-09-13 | 厦门天马微电子有限公司 | Display panel, driving method thereof and display device |
| CN112906496B (en) * | 2021-01-28 | 2022-09-09 | 湖北长江新型显示产业创新中心有限公司 | Fingerprint identification circuit, fingerprint identification method and display device |
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