CN105913055B - Fingerprint detection unit and its driving method, display device - Google Patents
Fingerprint detection unit and its driving method, display device Download PDFInfo
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Abstract
The invention discloses a kind of fingerprint detection unit and its driving methods, display device.The unit includes: compensation control module, the first light-sensitive device and the first output module, it compensates control module and connects the first operating voltage end, multiple control terminals and first node, the voltage of control signal and the output of the first operating voltage end for being inputted according to each control terminal generates constant current and inputs first node；First light-sensitive device is connected between first node and the second operating voltage end；First output module connects first node, and the first signal reads end and first and reads control terminal, for reading when control terminal applies read output signal first by the voltage output of first node.The present invention generates constant current by compensation control module, the electric current for passing through the first light-sensitive device is constant, and the voltage at each fingerprint detection unit is exported to carry out fingerprint recognition by the first output module, temperature interference caused by fingerprint recognition can be efficiently reduced, the accuracy of fingerprint recognition is improved.
Description
Technical Field
The invention relates to the technical field of fingerprint detection, in particular to a fingerprint detection unit, a driving method thereof and a display device.
Background
At present, one of the more common ways to identify fingerprints is optical fingerprint identification. When a finger presses the finger, the equivalent impedance of the photosensitive device changes due to different light intensities reflected from the valleys and the ridges onto the photosensitive device, whether the corresponding position is a valley or a ridge can be determined by measuring the light intensity flowing through the photosensitive device, and finally fingerprint information is obtained.
Referring to fig. 1, it is a circuit structure diagram of a simple fingerprint recognition unit; including the photo sensor S and the mos transistor T1, when the mos transistor T1 is turned on, it is possible to determine whether the corresponding valley or ridge is located at the fingerprint identification unit by reading the current flowing through the photo sensor S. In the course of implementing the present invention, the inventors of the present application found that in the fingerprint recognition unit shown in fig. 1, when a finger is pressed, since there is a temperature difference between the finger and the photosensor S, the heat of the finger is transferred to the photosensor S and the mos transistor T1, which may affect the threshold voltage of the mos transistor T1 and the resistance value of the photosensor S by the temperature, resulting in a detected current that is not accurate enough and accuracy of fingerprint recognition is reduced.
Disclosure of Invention
It is an object of the present invention to provide a fingerprint detection unit to reduce the influence of temperature on fingerprint recognition.
In a first aspect, the present invention provides a fingerprint detection unit, including: a compensation control module, a first photosensor, and a first output module, wherein,
the compensation control module is connected with the first working voltage end, the plurality of control ends and the first node, and is used for generating constant current according to control signals input by the control ends and voltage output by the first working voltage end and inputting the constant current into the first node;
the first photosensitive device is connected between a first node and a second working voltage end;
the first output module is connected with a first node, a first signal reading end and a first reading control end and is used for outputting the voltage of the first node when the first reading control end applies a reading signal.
Optionally, the compensation control module includes: a drive transistor, a reset control circuit, a compensation control circuit, and an output control circuit, wherein,
the driving transistor is connected with a second node, a third node and a fourth node;
the reset control circuit is connected with a reset control end, a second node, an initial voltage end and the first working voltage end, and is used for resetting the level of the second node according to a control signal input by the reset control end and voltages input by the initial voltage end and the first working voltage end;
the compensation control circuit is connected with a compensation control end, the second node, the third node, the fourth node and a data voltage input end, and is used for compensating the voltage of the second node according to a control signal input by the compensation control end and the voltage input by the data voltage input end, so that the current generated by the driving transistor according to the voltage of the second node is independent of the threshold voltage of the driving transistor;
the output control circuit is connected with the output control end, the first node, the third node, the fourth node, the first working voltage end and the first readout control end, and is used for controlling the voltage output by the first working voltage end to be input into the third node according to the control signal input by the output control end and controlling the constant current to be input into the first node according to the control signal input by the first readout control end.
Optionally, the reset control circuit includes a first transistor and a capacitor; wherein,
the grid electrode of the first transistor is connected with the reset control end, one of the source electrode and the drain electrode is connected with the initial voltage end, and the other one is connected with the second node;
and the first end of the capacitor is connected with the first working voltage end, and the second end of the capacitor is connected with the second node.
Optionally, the compensation control circuit includes: a second transistor and a third transistor, wherein,
the grid electrode of the second transistor is connected with the compensation control end, one of the source electrode and the drain electrode is connected with the data voltage input end, and the other one is connected with the third node;
the grid electrode of the third transistor is connected with the compensation control end, one of the source electrode and the drain electrode is connected with the second node, and the other one is connected with the fourth node.
Optionally, the output control circuit comprises a fourth transistor and a fifth transistor, wherein,
the grid electrode of the fourth transistor is connected with the output control end, one of the source electrode and the drain electrode is connected with the first working voltage end, and the other one is connected with the third node;
and the grid electrode of the fifth transistor is connected with the first readout control end, one of the source electrode and the drain electrode is connected with the fourth node, and the other one is connected with the first node.
Optionally, the method further includes: a second photosensor and a second output module, wherein,
the outer surface of the second photosensitive device is provided with a shading material, and the second photosensitive device is connected between a fifth node and the second working voltage end; the first photosensitive device is connected between a fifth node and the first node;
the second output module is connected with the fifth node, the second signal reading end and the first reading control end and used for outputting the voltage of the fifth node when the first reading control end applies the reading signal.
Optionally, the method further includes: a second photosensor and a second output module, wherein,
the outer surface of the second photosensitive device is provided with a shading material, and the second photosensitive device is connected between a sixth node and the second working voltage end;
the second output module is connected to the sixth node, the first signal readout terminal and the second readout control terminal, and is configured to output a voltage of a fifth node when the readout signal is applied to the second readout control terminal.
The compensation control module is further configured to input the constant current into the sixth node.
Optionally, when the fingerprint detection unit is the above fingerprint detection unit, the output control circuit further includes an eighth transistor;
the gate of the eighth transistor is connected to the second readout control terminal, one of the source and the drain is connected to the fourth node, and the other is connected to the fifth node.
In a second aspect, the present invention further provides a display device, including a substrate, and a plurality of pixel circuits and a plurality of fingerprint detection units formed on the substrate; the plurality of fingerprint detection units are the fingerprint detection units.
Optionally, the pixel circuit and the fingerprint detection unit share a signal line.
In a third aspect, the present invention also provides a method of driving a fingerprint detection unit as described above, comprising:
the method comprises the following steps that control signals are applied to a plurality of control ends connected with a compensation control module to drive the compensation control module to generate constant current and output the constant current to a first node;
the voltage of the first node is output by applying a control signal to the sense control terminal.
The fingerprint detection unit provided by the invention can generate constant current through the compensation control module, so that the current flowing through the first photosensitive device is constant, and the voltage output at each fingerprint detection unit is output through the first output module to carry out fingerprint identification. Because the current flowing through the first photosensitive device is constant, the voltage output by each fingerprint detection unit is only related to the resistance value of the first photosensitive device, and compared with the scheme of generating a fingerprint signal by reading the current in the prior art, the method can effectively reduce the interference of temperature on fingerprint identification and improve the accuracy of the fingerprint identification.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
FIG. 1 is a block diagram showing a fingerprint detection unit according to the prior art;
fig. 2 is a block diagram illustrating a fingerprint detection unit according to an embodiment of the present invention;
FIGS. 3a and 3b are specific circuit diagrams of a fingerprint sensing unit shown in FIG. 2;
FIG. 4 is a timing diagram of a corresponding driving method when driving the fingerprint detection unit shown in FIGS. 3a and 3 b;
fig. 5 is a block diagram showing a fingerprint detection unit according to another embodiment of the present invention;
FIG. 6 is a specific circuit diagram of a fingerprint sensing unit shown in FIG. 5;
fig. 7 is a block diagram showing a fingerprint detection unit according to another embodiment of the present invention;
FIG. 8 is a specific circuit diagram of a fingerprint sensing unit shown in FIG. 7;
fig. 9 is a timing chart of a driving method corresponding to the driving of the fingerprint detection unit shown in fig. 8.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Fig. 2 is a block diagram of a fingerprint detection unit according to an embodiment of the present invention, and referring to fig. 2, the fingerprint detection unit includes: a compensation control module 100, a first photosensor S1, and a first output module 200, wherein,
the compensation control module 100 is connected to the first operating voltage terminal ELVDD, a plurality of control terminals, and a first node N1, and is configured to generate a constant current according to a control signal input from each control terminal and a voltage output from the first operating voltage terminal ELVDD and input the constant current to the first node N1;
the first photo-sensing device S1 is connected between the first node N1 and the second operating voltage terminal ELVSS;
the first output block 200 is connected to the first node N1, the first signal sensing terminal OUT1 and the first sensing control terminal EN1, and is configured to output the voltage of the first node N1 when a sensing signal is applied to the first sensing control terminal EN 1.
The fingerprint detection unit can be driven in the following way: driving the compensation control module 100 to generate a constant current and output the constant current to the first node N1 by applying control signals on a plurality of control terminals to which the compensation control module 100 is connected;
the voltage of the first node N1 is output by applying a control signal at the sensing control terminal.
The fingerprint detection unit and the driving method thereof provided by the invention generate constant current through the compensation control module 100, so that the current flowing through the first photosensitive device S1 is constant, and the voltage output at each fingerprint detection unit is output through the first output module 200 to perform fingerprint identification. Because the current flowing through the first photosensitive device S1 is constant, the voltage output by each fingerprint detection unit is only related to the resistance value of the first photosensitive device S1, and compared with the scheme of generating a fingerprint signal by reading the current in the prior art, the method can effectively reduce the interference of temperature on fingerprint identification and improve the accuracy of the fingerprint identification.
It should be understood that, in the implementation, how to design each module specifically does not affect the protection scope of the present invention, and the corresponding technical solutions should fall into the protection scope of the present invention. The structure of each of the above-described blocks will be further described below with reference to specific circuit diagrams.
In specific implementation, the photosensitive device of the invention refers to a device with resistance changing along with the change of illumination intensity; such as a photo-resistor, or a photo-diode, photo-transistor, etc. equivalent to the photo-resistor.
As a specific example, fig. 3a and 3b are a specific circuit diagram of a fingerprint detection unit shown in fig. 2. As shown in figures 3a and 3b,
the first output module 200 includes a sixth transistor M6, a gate of the sixth transistor M6 is connected to the first sensing control terminal EN1, one of a source and a drain is connected to a node N1, and the other is connected to the first signal sensing terminal OUT 1;
the compensation control module 100 includes: a drive transistor T1, a reset control circuit 110, a compensation control circuit 120, and an output control circuit 130, wherein,
the driving transistor T1 connected to the second node N2, the third node N3 and the fourth node N4;
the Reset control circuit 110 is connected to a Reset control terminal Reset, a second node N2, an initial voltage terminal Vint and the first working voltage terminal ELVDD, and configured to Reset a level of the second node N2 according to a control signal input by the Reset control terminal Reset and voltages input by the initial voltage terminal Vint and the first working voltage terminal ELVDD;
the compensation control circuit 120 is connected to a compensation control terminal Gate, the second node N2, a third node N3, a fourth node N4 and a data voltage input terminal Vdata, and is configured to compensate the voltage of the second node N2 according to a control signal input by the compensation control terminal Gate and a voltage input by the data voltage input terminal Vdata, so that a current generated by the driving transistor T1 according to the voltage of the second node N2 is independent of a threshold voltage of the driving transistor T1;
the output control circuit 130 is connected to the output control terminal EM, the first node N1, the third node N3, the fourth node N4, the first working voltage terminal ELVDD, and the first readout control terminal EN1, and is configured to control a voltage output from the first working voltage terminal ELVDD to be input to the third node N3 according to a control signal input from the output control terminal EN, and control the constant current to be input to the first node according to a control signal input from the first readout control terminal EN 1.
The operation of the compensation control module in fig. 3a and 3b is briefly described below, wherein each port of the present solution is represented by the same letter as the signal connected to the port, for example: the Reset signals connected to the Reset control terminal and the Reset control terminal are both represented by Reset, and the first operating voltage connected to the first operating voltage terminal and the first operating voltage terminal are both represented by ELVDD, referring to fig. 4, the corresponding process includes:
in the stage I, the Reset signal Reset is at a low level, the compensation control signal Gate is at a high level, and the output control signal EM is at a high level; at this time, since the compensation control signal Gate and the output control signal EM are both at a high level, the compensation control circuit 120 and the output control circuit 130 do not function (it is assumed that the reset control circuit 110, the compensation control circuit 120, and the output control circuit 130 are all active at a high level and inactive at a low level); meanwhile, since the Reset signal Reset is at a low level, the Reset control circuit 110 resets the level of the second node N2 according to the initial voltage Vint and the first operating voltage ELVDD;
in the second stage, the Reset signal Reset is converted from low level to high level, the compensation control signal Gate is converted from high level to low level, and the output control signal EM still keeps high level; at this time, since the Reset signal Reset and the output control signal EM are at high levels, both the Reset control circuit 110 and the output control circuit 130 do not function; meanwhile, since the compensation control signal Gate is at a low level, the compensation control circuit 120 compensates the voltage of the second node N2 according to the data voltage Vdata, so that the current generated by the driving transistor T1 according to the voltage of the second node N2 is independent of the threshold voltage of the driving transistor T1;
in the stage III, the Reset signal Reset is kept at a high level, the compensation control signal Gate is kept at a high level, and the output control signal EM and the first readout control signal EN1 are converted from the high level to the low level; at this time, since the Reset signal Reset and the compensation control signal Gate are both at a high level, both the Reset control circuit 110 and the compensation control circuit 120 do not function; meanwhile, since the output control signal EM is at a low level, on one hand, the output control circuit 130 controls the first operating voltage ELVDD to be input to the third node N3 to drive the driving transistor T1 to generate a constant current, which is not constant for a long time, but is constant regardless of temperature; on the other hand, a constant current is controlled to be input to the first node N1 according to a control signal input from a first sensing control terminal EN 1.
The circuits in this scheme are illustrated below with reference to fig. 3a and 3 b:
as a specific example of the internal structure of the reset control circuit 110, the reset control circuit 110 in the embodiment of the present invention includes a first transistor M1 and a capacitor C. Wherein:
the gate of the first transistor M1 is connected to the Reset control terminal Reset, one of the source and the drain is connected to the initial voltage terminal Vint, and the other is connected to the second node N2;
the capacitor C has a first terminal connected to the first operating voltage terminal ELVDD and a second terminal connected to the second node N2.
It should be noted that the transistors used in the embodiments of the present invention may be thin film transistors, field effect transistors, or other devices with the same characteristics, and when the source and the drain of the transistor used have a symmetric structure, the source and the drain may not be particularly distinguished. As an example, in the embodiment of the present invention, when the gate of each transistor is connected to a low level, the transistor is turned on, and the source and the drain of each transistor are not distinguished. The source and drain of each transistor can be determined in a specific application circuit according to the corresponding function by those skilled in the art, and are not described herein again.
It can be understood that, in the embodiment of the present invention, since the transistor is turned on with a low level, when the Reset control signal Reset is at a low level, the first transistor M1 is turned on to form a current flowing from the initial voltage terminal Vint to the second node N2, so as to implement the function of resetting the level of the second node N2.
As a specific example of the internal structure of the compensation control circuit 120, the compensation control circuit 120 in the embodiment of the present invention includes a second transistor M2 and a third transistor M3. Wherein:
the Gate of the second transistor M2 is connected to the compensation control terminal Gate, one of the source and the drain is connected to the data voltage input terminal Vdata, and the other is connected to the third node N3;
the Gate of the third transistor M3 is connected to the compensation control terminal Gate, one of the source and the drain is connected to the second node N2, and the other is connected to the fourth node N4.
Therefore, when the compensation control signal is at a low level, the second transistor M2 and the third transistor M3 are turned on to form a current flowing from the data voltage input terminal Vdata to the third node N3, and further flowing to the second node N2 through the driving transistor T1 and the third transistor M3, so as to compensate the voltage of the second node N2, and further, the current generated by the driving transistor T1 according to the voltage of the second node N2 is independent of the threshold voltage of the driving transistor T1.
As a specific example of an internal structure of the output control circuit 130, the output control circuit 130 in the embodiment of the present invention includes a fourth transistor M4 and a fifth transistor M5. Wherein:
a gate of the fourth transistor M4 is connected to the output control terminal EM, one of a source and a drain is connected to the first operating voltage terminal ELVDD, and the other is connected to the third node N3;
the gate of the fifth transistor M5 is connected to the first sensing control terminal EN1, one of the source and the drain is connected to the fourth node N4, and the other is connected to the first node N1.
Thus, when the output control signal EM is at a low level, the fourth transistor M4 is turned on to form a current flowing from the first sensing control terminal EN1 to the third node N3 to drive the driving transistor T1; meanwhile, when the first sensing control signal EN1 is at a low level, the fifth transistor M5 is turned on to control the constant current input to the first node;
it is understood that, in the present embodiment, the fifth transistor M5 may also use the output control terminal EM in common with the fourth transistor M4 instead of using the first readout control terminal EN1 alone.
Fig. 4 is a timing diagram of a corresponding driving method when driving the fingerprint detection unit shown in fig. 3a and 3b, as shown in fig. 4, including:
stage I: the Reset signal Reset is at a low level, and the compensation control signal Gate, the output control signal EM, and the first readout control signal EN1 are at a high level; thus, the first transistor M1 is turned on, a current flowing from the initial voltage terminal Vint to the second node N2 is formed, and the level of the second node N2 is reset according to the initial voltage Vint and the first operating voltage ELVDD;
in the second stage, the Reset signal Reset is converted from low level to high level, the compensation signal Gate is converted from high level to low level, and the output control signal EM and the first readout control signal EN1 still keep high level; accordingly, the first transistor M1 is turned off, and the second transistor M2 and the third transistor M3 are turned on to form a current flowing from the data voltage input terminal Vdata to the third node N3 and flowing to the second node N2 through the driving transistor T1 and the third transistor M3, thereby implementing compensation of the second node N2, so that the current generated by the driving transistor T1 according to the voltage of the second node N2 is independent of the threshold voltage of the driving transistor T1;
stage III: the Reset signal Reset is kept at a high level, the compensation signal is converted from a low level to a high level, and the output control signal EM and the first readout control signal EN1 are converted from a high level to a low level; thereby, the first transistor M1, the second transistor M2, and the third transistor M3 are turned off, and the fourth transistor M4 and the fifth transistor M5 are turned on to form a current flowing from the first operating voltage ELVDD to the third node N3 to drive the driving transistor T1 to generate a constant current, and to input the current to the first node N1 through the fifth transistor M5.
As a specific example, fig. 5 shows a block diagram of a fingerprint detection unit according to another embodiment of the present invention, and referring to fig. 5, the circuit further includes a second photosensor S2 and a second output module 400, wherein,
the outer surface of the second photosensitive device S2 is provided with a light-shielding material, and the second photosensitive device S2 is connected between the first photosensitive device S1 and the second operating voltage terminal ELVSS; the first photosensor S1 is connected between the fifth node N5 and the first node N1;
the second output module 400 is connected to the fifth node N5, the second signal sensing terminal OUT2 and the first sensing control terminal EN1, and is configured to output the voltage of the fifth node N5 when the first sensing control terminal EN1 applies the sensing signal.
It can be understood that the first photosensor S1 and the second photosensor S2 are arranged in series in this scheme, which can save one MOS transistor and further save space for the pixel circuit;
in addition, the fingerprint detection unit shown in fig. 6 is similar to the embodiment of the fingerprint detection unit shown in fig. 2, and therefore, the description thereof is omitted here.
Fig. 6 is a detailed circuit diagram of a fingerprint sensing unit shown in fig. 5, and referring to fig. 6, the second output module 400 includes a seventh transistor M7, wherein a gate of the seventh transistor M7 is connected to the first sensing control terminal EN1, one of a source and a drain is connected to the fifth node N5, and the other is connected to the second signal sensing terminal OUT 2;
the driving method corresponding to the driving of the fingerprint detection unit shown in fig. 6 may be the same as the driving method of the circuits shown in fig. 3a and 3b, and the corresponding timing diagram may also refer to fig. 4, and the detailed process is not repeated here.
As a specific example, fig. 7 shows a block diagram of a fingerprint detection unit according to another embodiment of the present invention, and referring to fig. 7, the circuit further includes: a second photosensor S2, and a second output module 400, wherein,
a light shielding material is disposed on an outer surface of the second photo-sensor S2, and the second photo-sensor S2 is connected between a fifth node N5 and the second operating voltage terminal ELVSS;
the second output module 400 is connected to the sixth node N6, the first signal sensing terminal OUT1 and the second sensing control terminal EN2, and is configured to output the voltage of the fifth node N5 when the second sensing control terminal EN2 applies a sensing signal.
As a specific example, fig. 8 is a specific circuit diagram of a fingerprint detection unit shown in fig. 7, see fig. 8,
the second output module 400 includes a sixth transistor M6, a gate of the sixth transistor M6 is connected to the second sensing control terminal EN2, one of a source and a drain is connected to the sixth node N6, and the other first signal sensing terminal OUT 1;
as a specific example of an internal structure of the output control circuit 130, the output control circuit 130 in the embodiment of the present invention further includes: an eighth transistor M8; wherein,
the eighth transistor M8 has a gate connected to the second sensing control terminal EN2, a source and a drain, one of which is connected to the fourth node N4, and the other of which is connected to the sixth node N6, for controlling the constant current input to the sixth node N6 according to the control signal input from the second sensing control terminal EN 2;
thus, when the second sensing control terminal EN2 is at a low level, the eighth transistor M8 is turned on to allow a constant current to flow from the fourth node N4 to the sixth node N6.
It is understood that the outer surface of the first photosensor S1 is not covered by the light shielding material, and the fingerprint detection unit shown in fig. 8 is similar to the embodiment of the fingerprint detection unit shown in fig. 2, and therefore, the description thereof is omitted.
Fig. 9 is a timing diagram of a driving method corresponding to the driving of the fingerprint detection unit shown in fig. 8, which is similar to the timing diagram of the circuit shown in fig. 4, and the working process of the fingerprint detection unit shown in fig. 8 is similar to the fingerprint detection unit shown in fig. 3a and 3b, and the details of the same parts are omitted here;
in addition, as can be known from fig. 9, in the stages III and IV, the first read control signal EN1 and the second read control signal EN2 are sequentially changed from high level to low level, so as to obtain the light signals reflected by the valley and the ridge based on the voltage signals output twice;
when the first read control signal EN1 is low, M5 and M7 are turned on, and the voltage at the first node N1 is obtained; when the second read control signal EN2 is at a low level, M6 and M8 are turned on, and at this time, the voltage at the sixth node N6 can be obtained, and the difference between the two can eliminate the noise caused by the circuit, so as to obtain the optical signal of the actual voltage information. The advantage of setting up like this is that can judge the voltage signal of output according to two voltage signals and confirm whether the relevant position is the valley or the ridge, avoids because the wrong discernment that leads to of the error of a voltage signal, further improves the accuracy of discerning.
It can be understood that the fingerprint detection units shown in fig. 3a and 3b, and fig. 6 and 8 all use P-type tubes, so that they can be manufactured uniformly, and the manufacturing difficulty is reduced.
Based on the same inventive concept, an embodiment of the present invention provides a display device, including a substrate, and a plurality of pixel circuits and a plurality of fingerprint detection units formed on the substrate; the plurality of fingerprint detection units are any one of the fingerprint detection units;
it can be understood that, in any of the fingerprint detection units described above, the pixel circuit and the fingerprint detection unit share a signal line.
The display device may be: any product or component with a display function, such as a display panel, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator and the like. The display device includes any of the gate driving circuits described above, so that the same technical problems can be solved, and the same technical effects can be obtained, which are not described in detail herein.
In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A fingerprint detection unit, comprising: a compensation control module, a first photosensor, and a first output module, wherein,
the compensation control module is connected with the first working voltage end, the plurality of control ends and the first node, and is used for generating constant current according to control signals input by the control ends and voltage output by the first working voltage end and inputting the constant current into the first node;
the first photosensitive device is connected between a first node and a second working voltage end;
the first output module is connected with a first node, a first signal reading end and a first reading control end and is used for outputting the voltage of the first node when the first reading control end applies a reading signal; wherein the photosensitive device is a device whose resistance changes with the change of illumination intensity;
the compensation control module includes: a drive transistor, a reset control circuit, a compensation control circuit, and an output control circuit, wherein,
the driving transistor is connected with a second node, a third node and a fourth node;
the reset control circuit is connected with a reset control end, a second node, an initial voltage end and the first working voltage end, and is used for resetting the level of the second node according to a control signal input by the reset control end and voltages input by the initial voltage end and the first working voltage end;
the compensation control circuit is connected with a compensation control end, the second node, the third node, the fourth node and a data voltage input end, and is used for compensating the voltage of the second node according to a control signal input by the compensation control end and the voltage input by the data voltage input end, so that the current generated by the driving transistor according to the voltage of the second node is independent of the threshold voltage of the driving transistor;
the output control circuit is connected with the output control end, the first node, the third node, the fourth node, the first working voltage end and the first readout control end, and is used for controlling the voltage output by the first working voltage end to be input into the third node according to the control signal input by the output control end and controlling the constant current to be input into the first node according to the control signal input by the first readout control end.
2. The fingerprint detection unit of claim 1, wherein the reset control circuit comprises a first transistor and a capacitor; wherein,
the grid electrode of the first transistor is connected with the reset control end, one of the source electrode and the drain electrode is connected with the initial voltage end, and the other one is connected with the second node;
and the first end of the capacitor is connected with the first working voltage end, and the second end of the capacitor is connected with the second node.
3. The fingerprint detection unit of claim 1, wherein the compensation control circuit comprises: a second transistor and a third transistor, wherein,
the grid electrode of the second transistor is connected with the compensation control end, one of the source electrode and the drain electrode is connected with the data voltage input end, and the other one is connected with the third node;
the grid electrode of the third transistor is connected with the compensation control end, one of the source electrode and the drain electrode is connected with the second node, and the other one is connected with the fourth node.
4. The fingerprint detection unit of claim 1, wherein the output control circuit includes a fourth transistor and a fifth transistor, wherein,
the grid electrode of the fourth transistor is connected with the output control end, one of the source electrode and the drain electrode is connected with the first working voltage end, and the other one is connected with the third node;
and the grid electrode of the fifth transistor is connected with the first readout control end, one of the source electrode and the drain electrode is connected with the fourth node, and the other one is connected with the first node.
5. The fingerprint detection unit of any one of claims 1-3, further comprising: a second photosensor and a second output module, wherein,
the outer surface of the second photosensitive device is provided with a shading material, and the second photosensitive device is connected between a fifth node and the second working voltage end; the first photosensitive device is connected between a fifth node and the first node;
the second output module is connected with the fifth node, the second signal reading end and the first reading control end and used for outputting the voltage of the fifth node when the first reading control end applies the reading signal.
6. The fingerprint detection unit of any one of claims 1-4, further comprising: a second photosensor and a second output module, wherein,
the outer surface of the second photosensitive device is provided with a shading material, and the second photosensitive device is connected between a sixth node and the second working voltage end;
the second output module is connected with the sixth node, the first signal reading end and the second reading control end and used for outputting the voltage of the fifth node when the reading signal is applied to the second reading control end;
the compensation control module is further configured to input the constant current into the sixth node.
7. The fingerprint detection unit of claim 5, further comprising: a second photosensor and a second output module, wherein,
the outer surface of the second photosensitive device is provided with a shading material, and the second photosensitive device is connected between a fifth node and the second working voltage end; the first photosensitive device is connected between a fifth node and the first node;
the second output module is connected with a fifth node, a second signal reading end and the first reading control end and is used for outputting the voltage of the fifth node when the first reading control end applies a reading signal;
the output control circuit further comprises an eighth transistor;
the gate of the eighth transistor is connected to the second readout control terminal, one of the source and the drain is connected to the fourth node, and the other is connected to the fifth node.
8. A display device is characterized by comprising a substrate, a plurality of pixel circuits and a plurality of fingerprint detection units, wherein the pixel circuits and the fingerprint detection units are formed on the substrate; the number of fingerprint detection units is a fingerprint detection unit according to any of claims 1-7.
9. The display device according to claim 8, wherein the pixel circuit shares a signal line with the fingerprint identification unit.
10. A method of driving a fingerprint detection unit according to any one of claims 1 to 7, comprising:
the method comprises the following steps that control signals are applied to a plurality of control ends connected with a compensation control module to drive the compensation control module to generate constant current and output the constant current to a first node;
the voltage of the first node is output by applying a control signal to the sense control terminal.
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| CN107480650B (en) * | 2017-08-24 | 2020-03-27 | 京东方科技集团股份有限公司 | Fingerprint detection unit, fingerprint detection circuit, driving method of fingerprint detection circuit and display device |
| US10423286B1 (en) * | 2018-03-09 | 2019-09-24 | Int Tech Co., Ltd. | Circuit for fingerprint sensing and electronic device comprising the circuit |
| CN110223634A (en) * | 2019-06-11 | 2019-09-10 | 京东方科技集团股份有限公司 | Pixel circuit and its driving method and display panel |
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