CN111539340B - Display panel, display device and driving method - Google Patents
Display panel, display device and driving method Download PDFInfo
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- CN111539340B CN111539340B CN202010340129.2A CN202010340129A CN111539340B CN 111539340 B CN111539340 B CN 111539340B CN 202010340129 A CN202010340129 A CN 202010340129A CN 111539340 B CN111539340 B CN 111539340B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
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- Crystallography & Structural Chemistry (AREA)
- Optics & Photonics (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Image Input (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a display panel, a display device and a driving method. The fingerprint identification circuit in the display panel comprises a light sensing part, wherein the light sensing part comprises a photodiode and at least one light sensing thin film transistor; the black matrix layer comprises a plurality of first openings and a plurality of second openings, the first openings are in one-to-one correspondence with the pixel electrodes, the first openings penetrate through the black matrix layer to expose the corresponding pixel electrodes, the second openings are in one-to-one correspondence with the light sensing parts, and the second openings penetrate through the black matrix layer to expose the corresponding light sensing parts; the active layer of the switch transistor is a first active layer, the active layer of the photosensitive thin film transistor is a second active layer, and the conductivity of the first active layer is smaller than that of the second active layer. According to the technical scheme provided by the embodiment of the invention, the light sensing area of the light sensing part of the fingerprint identification circuit is increased, so that the photocurrent of the fingerprint identification circuit is increased, and the sensitivity of the fingerprint identification circuit is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel, a display device and a driving method.
Background
Fingerprints are unique biological characteristics of human bodies, are low in identification difficulty and mature in identification technology, and are widely applied to identity authentication in various social fields. Along with the continuous improvement of the screen occupation ratio requirement of a user, the optical fingerprint identification technology suitable for the full-face screen is favored.
However, the sensitivity of current fingerprint identification circuits for optical fingerprint identification is low.
Disclosure of Invention
The invention provides a display panel, a display device and a driving method, which aim to improve the sensitivity of a fingerprint identification circuit.
In a first aspect, an embodiment of the present invention provides a display panel, including: the liquid crystal display panel comprises an array substrate, a color film substrate and a liquid crystal layer, wherein the array substrate and the color film substrate are oppositely arranged, and the liquid crystal layer is positioned between the array substrate and the color film substrate;
the array substrate comprises a first substrate, a plurality of pixel electrodes and a plurality of optical fingerprint identification circuits, wherein the pixel electrodes and the optical fingerprint identification circuits are positioned on one side of the first substrate, which is close to the color film substrate; the fingerprint identification circuit comprises a light sensing part, wherein the light sensing part comprises a photodiode and at least one light sensing thin film transistor;
the color film substrate comprises a second substrate and a black matrix layer positioned on one side of the second substrate close to the array substrate; the black matrix layer comprises a plurality of first openings and a plurality of second openings, the first openings correspond to the pixel electrodes one by one, the first openings penetrate through the black matrix layer to be exposed and correspond to the pixel electrodes, the second openings correspond to the light sensing parts one by one, and the second openings penetrate through the black matrix layer to be exposed and correspond to the light sensing parts;
the array substrate further comprises a plurality of switch transistors, and each switch transistor is electrically connected with one pixel electrode; the active layer of the switch transistor is a first active layer, the active layer of the photosensitive thin film transistor is a second active layer, and the conductivity of the first active layer is smaller than that of the second active layer.
In a second aspect, an embodiment of the present invention further provides a display device, including the display panel according to the first aspect.
In a third aspect, an embodiment of the present invention further provides a driving method, configured to drive the optical fingerprint identification circuit in the display panel according to the first aspect;
the driving method comprises a plurality of periods for driving the optical fingerprint identification circuit, each period specifically comprising:
a reset period of time to reset the fingerprint identification circuit;
an exposure time interval for disconnecting the fingerprint signal output path of the fingerprint identification circuit and exposing the light sensing part;
and in the reading period, the fingerprint signal output channel of the fingerprint identification circuit is conducted, and the fingerprint identification signal is output.
According to the technical scheme provided by the embodiment of the invention, the photosensitive part in the fingerprint identification circuit comprises the photodiode and at least one photosensitive thin film transistor, and the conductivity of the active layer of the photosensitive thin film transistor is greater than that of the active layer of the switching thin film transistor, so that the photosensitive element in the fingerprint identification circuit comprises at least one photosensitive thin film transistor besides the photodiode, the photosensitive area of the photosensitive part of the fingerprint identification circuit is increased, the photocurrent of the fingerprint identification circuit is increased, and the sensitivity of the fingerprint identification circuit is improved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 is a schematic diagram of a partial structure of a display panel in the prior art;
FIG. 2 is a partial layout of a display panel of the prior art;
fig. 3 is a schematic partial structure diagram of a display panel according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a circuit structure of a fingerprint identification circuit according to an embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of a fingerprint identification circuit according to another embodiment of the present invention;
FIG. 6 is a schematic diagram of a fingerprint identification circuit according to another embodiment of the present invention;
FIG. 7 is a schematic diagram of a fingerprint identification circuit according to another embodiment of the present invention;
FIG. 8 is a schematic diagram of a partial structure of another display panel according to an embodiment of the present invention;
fig. 9 is a schematic top view of a display panel according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 11 is a flow chart illustrating a driving cycle of an optical fingerprint identification circuit according to an embodiment of the present invention;
FIG. 12 is a timing diagram for the fingerprint identification circuit of FIG. 4;
FIG. 13 is a timing diagram for the fingerprint identification circuit of FIG. 5.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given to specific embodiments, structures, features and effects of a display panel, a display device and a driving method according to the present invention with reference to the accompanying drawings and preferred embodiments.
An embodiment of the present invention provides a display panel, including: the liquid crystal display panel comprises an array substrate, a color film substrate and a liquid crystal layer, wherein the array substrate and the color film substrate are oppositely arranged, and the liquid crystal layer is positioned between the array substrate and the color film substrate;
the array substrate comprises a first substrate, a plurality of pixel electrodes and a plurality of optical fingerprint identification circuits, wherein the pixel electrodes and the optical fingerprint identification circuits are positioned on one side of the first substrate, which is close to the color film substrate; the fingerprint identification circuit comprises a light sensing part, wherein the light sensing part comprises a photodiode and at least one light sensing thin film transistor;
the color film substrate comprises a second substrate and a black matrix layer positioned on one side of the second substrate close to the array substrate; the black matrix layer comprises a plurality of first openings and a plurality of second openings, the first openings correspond to the pixel electrodes one by one, the first openings penetrate through the black matrix layer to be exposed and correspond to the pixel electrodes, the second openings correspond to the light sensing parts one by one, and the second openings penetrate through the black matrix layer to be exposed and correspond to the light sensing parts;
the array substrate further comprises a plurality of switch transistors, and each switch transistor is electrically connected with one pixel electrode; the active layer of the switch transistor is a first active layer, the active layer of the photosensitive thin film transistor is a second active layer, and the conductivity of the first active layer is smaller than that of the second active layer.
According to the technical scheme provided by the embodiment of the invention, the photosensitive part in the fingerprint identification circuit comprises the photodiode and at least one photosensitive thin film transistor, and the conductivity of the active layer of the photosensitive thin film transistor is greater than that of the active layer of the switching thin film transistor, so that the photosensitive element in the fingerprint identification circuit comprises at least one photosensitive thin film transistor besides the photodiode, the photosensitive area of the photosensitive part of the fingerprint identification circuit is increased, the photocurrent of the fingerprint identification circuit is increased, and the sensitivity of the fingerprint identification circuit is improved.
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other embodiments that depart from the specific details disclosed herein, and it will be recognized by those skilled in the art that the present invention may be practiced without these specific details.
Next, the present invention is described in detail with reference to the schematic drawings, and in the detailed description of the embodiments of the present invention, the schematic drawings showing the structure of the device are not partially enlarged in general scale for convenience of description, and the schematic drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and height should be included in the actual fabrication.
Fig. 1 is a schematic partial structure diagram of a display panel in the prior art. As shown in fig. 1, the display panel includes an array substrate 10 and a color filter substrate 20 that are disposed opposite to each other, and a liquid crystal layer 30 located between the array substrate 10 and the color filter substrate 20. The array substrate 10 includes a fingerprint identification circuit 40, only the photodiode 41 in the fingerprint identification circuit 40 is a photosensitive element, the black matrix layer 21 of the color film substrate 20 is provided with an opening 50 corresponding to the photodiode 41, and the photodiode 41 can receive light reflected by a finger of a user through the opening 50 to generate corresponding photo-generated current, so as to realize fingerprint detection.
Fig. 2 is a partial layout of a display panel in the related art. As shown in fig. 2, when the pixel aperture ratio is increased to obtain a better display effect, the area of the pixel aperture 60 is increased, the fingerprint identification circuit 40 is compressed, the area of the photodiode 41 is reduced, the photo-generated current generated by the photodiode is reduced, and the sensitivity of the fingerprint identification circuit 40 is low.
In order to solve the above problems in the prior art, in the embodiment of the present invention, at least one thin film transistor in the fingerprint identification circuit is set as a photosensitive element, so as to increase the total area of the photosensitive element in the fingerprint identification circuit, further increase the photo-generated current in the fingerprint identification process, and improve the sensitivity of the fingerprint identification circuit.
Specifically, fig. 3 is a schematic partial structure diagram of a display panel according to an embodiment of the present invention. As shown in fig. 3, the display panel includes an array substrate 100 and a color filter substrate 200 that are oppositely disposed, and a liquid crystal layer 300 located between the array substrate 100 and the color filter substrate 200.
The array substrate 100 includes a first substrate 110, and a plurality of pixel electrodes 120 and a plurality of optical fingerprint identification circuits 130 located on one side of the first substrate 110 close to the color filter substrate 200, where the fingerprint identification circuit 130 includes a light-sensing portion, and the light-sensing portion includes a photodiode 131 and at least one light-sensing thin film transistor 132.
The color filter substrate 200 includes a second substrate 210 and a black matrix layer 220 located on one side of the second substrate 210 close to the array substrate 100, the black matrix layer 220 includes a plurality of first openings 221 and a plurality of second openings 222, the first openings 221 are in one-to-one correspondence with the pixel electrodes 120, the first openings 221 penetrate through the black matrix layer 220 to expose the corresponding pixel electrodes 120, the second openings 222 are in one-to-one correspondence with the light sensing portions, and the second openings 222 penetrate through the black matrix layer 220 to expose the corresponding light sensing portions.
The array substrate 100 further includes a plurality of switching transistors 140, each switching transistor 140 is electrically connected to one pixel electrode 120, an active layer of the switching transistor 140 is a first active layer 141, an active layer of the photosensitive thin film transistor 132 is a second active layer 142, and the conductivity of the first active layer 141 is less than that of the second active layer 142.
It should be noted that the black matrix layer 220 has a light-shielding property, the arrangement of the first opening 221 ensures normal light emission of the pixel, so that the display panel can realize normal image display, and the arrangement of the second opening 222 ensures that light reflected by a finger of a user can be incident to the light-sensing portion, so as to generate a corresponding light-generated current, thereby realizing normal fingerprint identification. The first opening 221 is provided with a color film layer therein for changing the light emitting color of the corresponding pixel, and the color of the color film layer may be red, green or blue, for example.
It should be further noted that the switching transistor 140 is a conventional transistor structure, and can be used as a switch of a circuit branch. The conductivity of the active layer of the photosensitive thin film transistor 132 is greater than that of the switching transistor 140, and a large photo-generated current can be generated and used as a photosensitive element.
It should be noted that, limited by the cross-sectional position, fig. 3 only illustrates the photodiode 131 and the photosensitive tft 132 in the fingerprint identification circuit 130, and the fingerprint identification circuit 130 may further include other components, and the specific structure thereof may be reasonably configured according to actual needs, and is not limited herein. The number of light-receiving thin film transistors 132 included in the light-receiving section is not limited to one, and may be a plurality in other embodiments of the present embodiment.
According to the technical scheme provided by this embodiment, the light sensing portion in the fingerprint identification circuit 130 includes the photodiode 131 and the at least one light sensing thin film transistor 132, and the conductivity of the active layer of the light sensing thin film transistor 132 is greater than that of the active layer of the switch thin film transistor 140, so that the light sensing element in the fingerprint identification circuit 130 includes the at least one light sensing thin film transistor 132 in addition to the photodiode 131, the light sensing area of the light sensing portion of the fingerprint identification circuit 130 is increased, the photocurrent of the fingerprint identification circuit 130 is further increased, and the sensitivity of the fingerprint identification circuit 130 is improved. Especially for the display panel with large pixel aperture ratio, the area of the light sensing part with the compressed area is still larger, larger photo-generated current can be generated, the sensitivity of the fingerprint identification circuit 130 is larger, and the problem that the sensitivity of the display panel with large pixel aperture ratio in the prior art is lower is solved.
Fig. 4 is a schematic circuit structure diagram of a fingerprint identification circuit according to an embodiment of the present invention. As shown in fig. 4, the at least one light sensing thin film transistor includes a first light sensing thin film transistor T1, and the fingerprint identification circuit further includes a first switching thin film transistor T2, a second switching thin film transistor T3, and a first capacitor C1. The first end of the first light sensing thin film transistor T1 is electrically connected to the first voltage terminal V1, the second end is electrically connected to the first node O1, and the control terminal is electrically connected to the reset control terminal Vrst. The cathode of the photodiode D is electrically connected to the first node O1, and the anode is electrically connected to the second voltage terminal V2. The first end of the first switching thin film transistor T2 is electrically connected to the first voltage terminal V1, the second end is electrically connected to the first end of the second switching thin film transistor T3, and the control end is electrically connected to the first node O1. A second end of the second switching thin film transistor T3 is electrically connected to the data output terminal Vdata, and a control terminal is electrically connected to the read control terminal Vread. The first capacitor C1 has a first terminal electrically connected to the first node O1 and a second terminal electrically connected to the second voltage terminal V2.
Fig. 5 is a schematic circuit diagram of another fingerprint identification circuit according to an embodiment of the present invention. As shown in fig. 5, the at least one light sensing thin film transistor includes a second light sensing thin film transistor T4, and the fingerprint identification circuit further includes a third switching thin film transistor T5, a fourth switching thin film transistor T6, a fifth switching thin film transistor T7, and a second capacitor C2. The first end of the second photosensitive thin film transistor T4 is electrically connected to the second node O2, the second end is electrically connected to the cathode of the photodiode D, and the control end is electrically connected to the photosensitive control end Vlight. The third switching thin film transistor T5 has a first terminal electrically connected to the first voltage terminal V1, a second terminal electrically connected to the second node O2, and a control terminal electrically connected to the reset control terminal Vrst. The anode of the photodiode D is electrically connected to the second voltage terminal V2. The first end of the fourth switching thin film transistor T6 is electrically connected to the first voltage terminal V1, the second end is electrically connected to the first end of the fifth switching thin film transistor T7, and the control end is electrically connected to the second node O2. A second end of the fifth switching thin film transistor T7 is electrically connected to the data output end Vdata, a control end is electrically connected to the read control end Vread, a first end of the second capacitor C2 is electrically connected to the second node O2, and a second end is electrically connected to the second voltage end V2.
Fig. 6 is a schematic structural diagram of another fingerprint identification circuit according to an embodiment of the present invention. Fig. 7 is a schematic structural diagram of another fingerprint identification circuit according to an embodiment of the present invention. As shown in fig. 6 and 7, based on the structure of the fingerprint identification circuit shown in fig. 4 and 5, the fingerprint identification circuit shown in fig. 6 and 7 further includes a first output thin film transistor T8 and a second output thin film transistor T9, the data output terminal Vdata is electrically connected to the first terminal of the first output thin film transistor T8 and the first terminal of the second output thin film transistor T9, the second terminal of the first output thin film transistor T8 is electrically connected to the fingerprint signal output terminal Vout1 of the fingerprint identification circuit, the second terminal of the second output thin film transistor T9 is electrically connected to the noise signal output terminal Vout2 of the fingerprint identification circuit, the control terminal of the first output thin film transistor T8 is electrically connected to the fingerprint signal output control terminal Vsig, and the control terminal of the second output thin film transistor T9 is electrically connected to the noise output control terminal Vnoise.
It should be noted that, the arrangement of the first output thin film transistor T8 and the second output thin film transistor T9 enables the fingerprint identification circuit to output the fingerprint identification signal and the noise signal respectively at different time intervals, so that the noise signal can be reduced by the fingerprint identification signal to obtain the noiseless fingerprint identification signal, which is beneficial to improving the accuracy of the fingerprint identification result.
For example, in the present embodiment, the potential of the second voltage terminal V2 may be 0, that is, the arrangement for electrically connecting the second voltage terminal V2 is equivalent to ground.
Fig. 8 is a schematic partial structure diagram of another display panel according to an embodiment of the present invention. As shown in fig. 8, the photosensitive thin film transistor 132 may be a double gate thin film transistor.
It should be noted that the double-gate tft has low dark-state leakage and high photosensitivity, which is beneficial to improving the performance 130 of the fingerprint identification circuit, and is a preferred choice for the photosensitive tft 132.
Fig. 9 is a schematic top view of a display panel according to an embodiment of the present invention. As shown in fig. 9, the plurality of first openings 221 are arranged in a matrix, and every three first openings 221 form a pixel opening group 400 along the row direction X of the matrix, the pixel opening group 400 is in one-to-one correspondence with the second openings 222, and each second opening 222 is disposed on the same side of the corresponding pixel opening group 400 along the column direction Y of the matrix.
It should be noted that in a conventional display panel, a pixel generally includes a red pixel, a green pixel and a blue pixel, the red pixel, the green pixel and the blue sub-pixel which are adjacently disposed constitute a pixel unit, and light of different colors emitted by three pixels in the pixel unit is mixed to obtain target white light for image display. The arrangement mode in fig. 9 enables the red pixels, the green pixels and the blue pixels in each pixel unit to be closely arranged, and the plurality of fingerprint identification circuits in the display panel can be uniformly distributed, so that fingerprints in all areas in the whole display panel can be accurately identified, and no identification dead angle exists.
Fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 10, the display device 2 includes the display panel 1 according to any embodiment of the present invention. Since the display device 2 provided in this embodiment includes any of the display panels 1 provided in the embodiments of the present invention, the display device has the same or corresponding beneficial effects as the display panel 1 included in the display device, and details are not repeated herein.
Further, an embodiment of the present invention further provides a driving method, where the driving method is used to drive an optical fingerprint identification circuit in a display panel provided in any embodiment of the present invention, and includes a plurality of cycles for driving the optical fingerprint identification circuit, where each cycle specifically includes a reset period, an exposure period, and a reading period. Specifically, fig. 11 is a flowchart illustrating a driving cycle of an optical fingerprint identification circuit according to an embodiment of the present invention. As shown in fig. 11, each period specifically includes the following:
According to the technical scheme, the fingerprint identification circuit is reset in the reset period, the fingerprint signal output passage of the fingerprint identification circuit is disconnected in the exposure period, the light sensing part is exposed, the fingerprint signal output passage of the fingerprint identification circuit is connected in the reading period, and the fingerprint identification signal is output, so that the photodiode and at least one photosensitive thin film transistor in the fingerprint identification circuit generate corresponding photo-generated current according to the reflected light rays of the finger, and the sensitivity of the fingerprint identification circuit is improved.
Optionally, the at least one light sensing thin film transistor includes a first light sensing thin film transistor T1, and the fingerprint identification circuit further includes a first switching thin film transistor T2, a second switching thin film transistor T3, and a first capacitor C1. The first end of the first light sensing thin film transistor T1 is electrically connected to the first voltage terminal V1, the second end is electrically connected to the first node O1, and the control terminal is electrically connected to the reset control terminal Vrst. The cathode of the photodiode D is electrically connected to the first node O1, and the anode is electrically connected to the second voltage terminal V2. The first end of the first switching thin film transistor T2 is electrically connected to the first voltage terminal V1, the second end is electrically connected to the first end of the second switching thin film transistor T3, and the control end is electrically connected to the first node O1. A second end of the second switching thin film transistor T3 is electrically connected to the data output terminal Vdata, and a control terminal is electrically connected to the read control terminal Vread. The first capacitor C1 has a first terminal electrically connected to the first node O1 and a second terminal electrically connected to the second voltage terminal V2, see fig. 4.
Fig. 12 is a timing diagram of the fingerprint identification circuit of fig. 4. As shown in fig. 12, the timing diagram includes a plurality of driving periods t, each period t includes a reset period t1, an exposure period t2, and a reading period t3, specifically, in the reset period t1, the first voltage terminal V1 provides a high level, the reset control terminal Vrst provides a conducting level, and the first photosensitive thin film transistor is controlled to be conducted, so that the potential of the first voltage terminal V1 is transmitted to the first node. The exposure period t2 includes a main exposure period t2 ', in which the reset control terminal Vrst provides an off level to control the first photosensitive thin film transistor to be turned off, the first voltage terminal V1 provides a low level, the read control terminal Vread provides an off level to control the second switching thin film transistor to be turned off, and the main exposure period t 2'. In the read period t3, the first voltage terminal V1 provides a high level, the read control terminal Vread provides a turn-on level, the second switching thin film transistor is controlled to be turned on, the reset control terminal Vrst provides a turn-off level, and the first photosensitive thin film transistor is controlled to be turned off to output the fingerprint identification signal.
Further, on the basis of the fingerprint identification circuit structure shown in fig. 4, the fingerprint identification circuit further includes a first output thin film transistor T8 and a second output thin film transistor T9, the data output terminal Vdata is electrically connected to the first terminal of the first output thin film transistor T8 and the first terminal of the second output thin film transistor T9, the second terminal of the first output thin film transistor T8 is electrically connected to the fingerprint signal output terminal Vout1 of the fingerprint identification circuit, the second terminal of the second output thin film transistor T9 is electrically connected to the noise signal output terminal Vout2 of the fingerprint identification circuit, the control terminal of the first output thin film transistor T8 is electrically connected to the fingerprint signal output control terminal Vsig, and the control terminal of the second output thin film transistor T9 is electrically connected to the noise output control terminal Vnoise, see fig. 6.
Correspondingly, with continued reference to fig. 12, before the main exposure period t2 ', the exposure period t2 further includes a noise output period t1 ', in the noise output period t1 ', the reset control terminal Vrst provides an off level to control the first photosensitive thin film transistor to be turned off, the first voltage terminal V1 provides a high level, the read control terminal Vread provides an on level to control the second switching thin film transistor to be turned on, the fingerprint signal output control terminal Vsig provides an off level to control the first output thin film transistor to be turned off, the noise output control terminal Vnoise provides an on level to control the second output thin film transistor to be turned on, so that the noise signal output terminal outputs a noise signal. In the main exposure period t 2', the fingerprint signal output control terminal Vsig provides an off level to control the first output thin film transistor to be turned off, the noise output control terminal Vnoise provides an off level to control the second output thin film transistor to be turned off, and in the reading period t3, the fingerprint signal output control terminal Vsig provides an on level to control the first output thin film transistor to be turned on, and the noise output control terminal Vnoise provides an off level to control the second output thin film transistor to be turned off.
In other embodiments of this embodiment, the at least one light sensing thin film transistor includes a second light sensing thin film transistor T4, and the fingerprint identification circuit further includes a third switching thin film transistor T5, a fourth switching thin film transistor T6, a fifth switching thin film transistor T7, and a second capacitor C2. The first end of the second photosensitive thin film transistor T4 is electrically connected to the second node O2, the second end is electrically connected to the cathode of the photodiode D, and the control end is electrically connected to the photosensitive control end Vlight. The third switching thin film transistor T5 has a first terminal electrically connected to the first voltage terminal V1, a second terminal electrically connected to the second node O2, and a control terminal electrically connected to the reset control terminal Vrst. The anode of the photodiode D is electrically connected to the second voltage terminal V2. The first end of the fourth switching thin film transistor T6 is electrically connected to the first voltage terminal V1, the second end is electrically connected to the first end of the fifth switching thin film transistor T7, and the control end is electrically connected to the second node O2. A second terminal of the fifth switching thin film transistor T7 is electrically connected to the data output terminal Vdata, a control terminal is electrically connected to the read control terminal Vread, a first terminal of the second capacitor C2 is electrically connected to the second node O2, and a second terminal is electrically connected to the second voltage terminal V2, as shown in fig. 5.
FIG. 13 is a timing diagram for the fingerprint identification circuit of FIG. 5. As shown in fig. 13, the timing diagram includes a plurality of driving periods t, each period t includes a reset period t1, an exposure period t2, and a reading period t3, specifically, in the reset period t1, the first voltage terminal V1 provides a high level, the reset control terminal Vrst provides a conducting level, the third switching tft is controlled to be turned on, the photosensitive control terminal Vlight provides a conducting level, and the second photosensitive tft is controlled to be turned on, so that the potential of the first voltage terminal V1 is transmitted to the second node. The exposure period t2 includes a main exposure period t2 ', in which the light sensing control terminal Vlight provides an off level to control the second light sensing tft to be turned off, the reset control terminal Vrst provides an on level to control the third switching tft to be turned on, the first voltage terminal V1 provides a low level, the read control terminal Vread provides an off level to control the fifth switching tft to be turned off during the main exposure period t 2'. In the reading period t3, the first voltage terminal V1 provides a high level, the reset control terminal Vrst provides a turn-off level, the third switching thin film transistor is controlled to be turned off, the read control terminal Vread provides a turn-on level, the fifth switching thin film transistor is controlled to be turned on, the photosensitive control terminal Vlight provides a turn-on level, and the second photosensitive thin film transistor is controlled to be turned on to output the fingerprint identification signal.
Further, on the basis of the structure of the fingerprint identification circuit shown in fig. 5, the fingerprint identification circuit further includes a first output thin film transistor T8 and a second output thin film transistor T9, the data output terminal Vdata is electrically connected to the first end of the first output thin film transistor T8 and the first end of the second output thin film transistor T9, the second end of the first output thin film transistor T8 is electrically connected to the fingerprint signal output terminal Vout1 of the fingerprint identification circuit, the second end of the second output thin film transistor T9 is electrically connected to the noise signal output terminal Vout2 of the fingerprint identification circuit, the control terminal of the first output thin film transistor T8 is electrically connected to the fingerprint signal output control terminal Vsig, and the control terminal of the second output thin film transistor T9 is electrically connected to the noise output control terminal Vnoise, as shown in fig. 7.
Correspondingly, with continued reference to fig. 13, after the main exposure period t2 ', the exposure period t2 further includes a noise output period t1 ', and in the noise output period t1 ', the photosensitive control terminal Vlight provides an off level to control the second photosensitive tft to be turned off, the reset control terminal Vrst provides an off level to control the third switching tft to be turned off, the first voltage terminal V1 provides a high level, the read control terminal Vread provides an on level to control the fifth switching tft to be turned on, the fingerprint signal output control terminal Vsig provides an off level to control the first output tft to be turned off, the noise output control terminal Vnoise provides an on level to control the second output tft to be turned on, so that the noise signal output terminal outputs a noise signal. In the reading period t3, the fingerprint signal output control terminal Vsig provides an on level to control the first output thin film transistor to be turned on, and the noise output control terminal Vnoise provides an off level to control the second output thin film transistor to be turned off.
It is to be noted that the foregoing description is only exemplary of the invention and that the principles of the technology may be employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in some detail by the above embodiments, the invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the invention, and the scope of the invention is determined by the scope of the appended claims.
Claims (12)
1. A display panel, comprising: the liquid crystal display panel comprises an array substrate, a color film substrate and a liquid crystal layer, wherein the array substrate and the color film substrate are oppositely arranged, and the liquid crystal layer is positioned between the array substrate and the color film substrate;
the array substrate comprises a first substrate, a plurality of pixel electrodes and a plurality of optical fingerprint identification circuits, wherein the pixel electrodes and the optical fingerprint identification circuits are positioned on one side of the first substrate, which is close to the color film substrate; the fingerprint identification circuit comprises a light sensing part, wherein the light sensing part comprises a photodiode and at least one light sensing thin film transistor;
the color film substrate comprises a second substrate and a black matrix layer positioned on one side of the second substrate close to the array substrate; the black matrix layer comprises a plurality of first openings and a plurality of second openings, the first openings correspond to the pixel electrodes one by one, the first openings penetrate through the black matrix layer to be exposed and correspond to the pixel electrodes, the second openings correspond to the light sensing parts one by one, and the second openings penetrate through the black matrix layer to be exposed and correspond to the light sensing parts;
the array substrate further comprises a plurality of switch transistors, and each switch transistor is electrically connected with one pixel electrode; the active layer of the switch transistor is a first active layer, the active layer of the photosensitive thin film transistor is a second active layer, and the conductivity of the first active layer is smaller than that of the second active layer.
2. The display panel of claim 1, wherein the at least one light-sensitive thin film transistor comprises a first light-sensitive thin film transistor; the fingerprint identification circuit further comprises a first switch thin film transistor, a second switch thin film transistor and a first capacitor;
the first end of the first photosensitive thin film transistor is electrically connected with a first voltage end, the second end of the first photosensitive thin film transistor is electrically connected with a first node, and the control end of the first photosensitive thin film transistor is electrically connected with a reset control end;
the negative electrode of the photodiode is electrically connected with the first node, and the positive electrode of the photodiode is electrically connected with a second voltage end;
the first end of the first switch thin film transistor is electrically connected with the first voltage end, the second end of the first switch thin film transistor is electrically connected with the first end of the second switch thin film transistor, and the control end of the first switch thin film transistor is electrically connected with the first node;
the second end of the second switch thin film transistor is electrically connected with the data output end, and the control end is electrically connected with the reading control end;
the first end of the first capacitor is electrically connected with the first node, and the second end of the first capacitor is electrically connected with the second voltage end.
3. The display panel of claim 1, wherein the at least one light-sensitive thin film transistor comprises a second light-sensitive thin film transistor; the fingerprint identification circuit further comprises a third switch thin film transistor, a fourth switch thin film transistor, a fifth switch thin film transistor and a second capacitor;
the first end of the second photosensitive thin film transistor is electrically connected with a second node, the second end of the second photosensitive thin film transistor is electrically connected with the cathode of the photodiode, and the control end of the second photosensitive thin film transistor is electrically connected with a photosensitive control end;
the first end of the third switch thin film transistor is electrically connected with a first voltage end, the second end of the third switch thin film transistor is electrically connected with the second node, and the control end of the third switch thin film transistor is electrically connected with a reset control end;
the positive electrode of the photodiode is electrically connected with a second voltage end;
the first end of the fourth switching thin film transistor is electrically connected with the first voltage end, the second end of the fourth switching thin film transistor is electrically connected with the first end of the fifth switching thin film transistor, and the control end of the fourth switching thin film transistor is electrically connected with the second node;
the second end of the fifth switch thin film transistor is electrically connected with the data output end, and the control end is electrically connected with the reading control end;
and the first end of the second capacitor is electrically connected with the second node, and the second end of the second capacitor is electrically connected with the second voltage end.
4. The display panel according to claim 2 or 3, wherein the fingerprint identification circuit further comprises a first output thin film transistor and a second output thin film transistor, the data output terminal is electrically connected to a first terminal of the first output thin film transistor and a first terminal of the second output thin film transistor, a second terminal of the first output thin film transistor is electrically connected to the fingerprint signal output terminal of the fingerprint identification circuit, a second terminal of the second output thin film transistor is electrically connected to the noise signal output terminal of the fingerprint identification circuit, a control terminal of the first output thin film transistor is electrically connected to the fingerprint signal output control terminal, and a control terminal of the second output thin film transistor is electrically connected to the noise output control terminal.
5. The display panel of claim 1, wherein the light sensing thin film transistor is a double gate thin film transistor.
6. The display panel according to claim 1, wherein the plurality of first openings are arranged in a matrix, and each three first openings form a pixel opening group along a row direction of the matrix;
the pixel opening groups correspond to the second openings one to one, and the second openings are arranged on the same side corresponding to the pixel opening groups along the column direction of the matrix.
7. A display device characterized by comprising the display panel according to any one of claims 1 to 6.
8. A driving method for driving the optical fingerprint recognition circuit in the display panel according to any one of claims 1 to 6;
the driving method comprises a plurality of periods for driving the optical fingerprint identification circuit, each period specifically comprising:
a reset period of time to reset the fingerprint identification circuit;
an exposure time interval for disconnecting the fingerprint signal output path of the fingerprint identification circuit and exposing the light sensing part;
and in the reading period, the fingerprint signal output channel of the fingerprint identification circuit is conducted, and the fingerprint identification signal is output.
9. The driving method according to claim 8, wherein the at least one photosensitive thin film transistor comprises a first photosensitive thin film transistor; the fingerprint identification circuit further comprises a first switch thin film transistor, a second switch thin film transistor and a first capacitor; the first end of the first photosensitive thin film transistor is electrically connected with a first voltage end, the second end of the first photosensitive thin film transistor is electrically connected with a first node, and the control end of the first photosensitive thin film transistor is electrically connected with a reset control end; the negative electrode of the photodiode is electrically connected with the first node, and the positive electrode of the photodiode is electrically connected with a second voltage end; the first end of the first switch thin film transistor is electrically connected with the first voltage end, the second end of the first switch thin film transistor is electrically connected with the first end of the second switch thin film transistor, and the control end of the first switch thin film transistor is electrically connected with the first node; the second end of the second switch thin film transistor is electrically connected with the data output end, and the control end is electrically connected with the reading control end; the first end of the first capacitor is electrically connected with the first node, and the second end of the first capacitor is electrically connected with a second voltage end;
each of the periods specifically includes:
in the reset period, the first voltage end provides a high level, the reset control end provides a conducting level, the first photosensitive thin film transistor is controlled to be conducted, and the potential of the first voltage end is transmitted to the first node;
an exposure period comprising a main exposure period; in the main exposure period, the reset control end provides a cut-off level to control the first photosensitive thin film transistor to be cut off, the first voltage end provides a low level, and the reading control end provides a cut-off level to control the second switch thin film transistor to be cut off;
in a reading period, the first voltage end provides a high level, the reading control end provides a conducting level to control the second switch thin film transistor to be conducted, and the reset control end provides a stopping level to control the first photosensitive thin film transistor to be stopped so as to output a fingerprint identification signal.
10. The driving method according to claim 9, wherein the fingerprint identification circuit further includes a first output thin film transistor and a second output thin film transistor, the data output terminal is electrically connected to a first terminal of the first output thin film transistor and a first terminal of the second output thin film transistor, a second terminal of the first output thin film transistor is electrically connected to a fingerprint signal output terminal of the fingerprint identification circuit, a second terminal of the second output thin film transistor is electrically connected to a noise signal output terminal of the fingerprint identification circuit, a control terminal of the first output thin film transistor is electrically connected to a fingerprint signal output control terminal, and a control terminal of the second output thin film transistor is electrically connected to a noise output control terminal;
before the main exposure time interval, the exposure time interval further comprises a noise output time interval, in the noise output time interval, the reset control end provides a cut-off level to control the first photosensitive thin film transistor to be cut off, the first voltage end provides a high level, the reading control end provides a conducting level to control the second switch thin film transistor to be conducted, the fingerprint signal output control end provides a cut-off level to control the first output thin film transistor to be cut off, and the noise output control end provides a conducting level to control the second output thin film transistor to be conducted, so that the noise signal output end outputs a noise signal;
in the main exposure time period, the fingerprint signal output control end provides a cut-off level to control the first output thin film transistor to be cut off, and the noise output control end provides a cut-off level to control the second output thin film transistor to be cut off;
in the reading period, the fingerprint signal output control end provides a conducting level to control the first output thin film transistor to be conducted, and the noise output control end provides a cut-off level to control the second output thin film transistor to be cut off.
11. The driving method according to claim 8, wherein the at least one photosensitive thin film transistor includes a second photosensitive thin film transistor; the fingerprint identification circuit further comprises a third switch thin film transistor, a fourth switch thin film transistor, a fifth switch thin film transistor and a second capacitor; the first end of the second photosensitive thin film transistor is electrically connected with a second node, the second end of the second photosensitive thin film transistor is electrically connected with the negative electrode of the photodiode, and the control end of the second photosensitive thin film transistor is electrically connected with a photosensitive control end; the first end of the third switch thin film transistor is electrically connected with a first voltage end, the second end of the third switch thin film transistor is electrically connected with the second node, and the control end of the third switch thin film transistor is electrically connected with a reset control end; the positive electrode of the photodiode is electrically connected with a second voltage end; the first end of the fourth switching thin film transistor is electrically connected with the first voltage end, the second end of the fourth switching thin film transistor is electrically connected with the first end of the fifth switching thin film transistor, and the control end of the fourth switching thin film transistor is electrically connected with the second node; the second end of the fifth switch thin film transistor is electrically connected with the data output end, and the control end is electrically connected with the reading control end; the first end of the second capacitor is electrically connected with the second node, and the second end of the second capacitor is electrically connected with a second voltage end;
each of the periods specifically includes:
in the reset period, the first voltage end provides a high level, the reset control end provides a conduction level to control the third switch thin film transistor to be conducted, and the photosensitive control end provides a conduction level to control the second photosensitive thin film transistor to be conducted, so that the potential of the first voltage end is transmitted to the second node;
the exposure time interval comprises a main exposure time interval, in the main exposure time interval, the photosensitive control end provides a cut-off level to control the second photosensitive thin film transistor to be cut off, the reset control end provides a turn-on level to control the third switch thin film transistor to be turned on, the first voltage end provides a low level, the reading control end provides a cut-off level to control the fifth switch thin film transistor to be cut off;
in the reading period, the first voltage end provides a high level, the reset control end provides a cut-off level to control the third switch thin film transistor to be cut off, the reading control end provides a conducting level to control the fifth switch thin film transistor to be conducted, and the photosensitive control end provides a conducting level to control the second photosensitive thin film transistor to be conducted so as to output a fingerprint identification signal.
12. The driving method according to claim 11, wherein the fingerprint identification circuit further includes a first output thin film transistor and a second output thin film transistor, the data output terminal is electrically connected to a first terminal of the first output thin film transistor and a first terminal of the second output thin film transistor, a second terminal of the first output thin film transistor is electrically connected to a fingerprint signal output terminal of the fingerprint identification circuit, a second terminal of the second output thin film transistor is electrically connected to a noise signal output terminal of the fingerprint identification circuit, a control terminal of the first output thin film transistor is electrically connected to a fingerprint signal output control terminal, and a control terminal of the second output thin film transistor is electrically connected to a noise output control terminal;
after the main exposure period, the exposure period further includes a noise output period, in the noise output period, the photosensitive control terminal provides a cut-off level to control the second photosensitive thin film transistor to be cut off, the reset control terminal provides a cut-off level to control the third switching thin film transistor to be cut off, the first voltage terminal provides a high level, the read control terminal provides a turn-on level to control the fifth switching thin film transistor to be turned on, the fingerprint signal output control terminal provides a cut-off level to control the first output thin film transistor to be cut off, and the noise output control terminal provides a turn-on level to control the second output thin film transistor to be turned on, so that the noise signal output terminal outputs a noise signal;
in the reading period, the fingerprint signal output control end provides a conducting level to control the first output thin film transistor to be conducted, and the noise output control end provides a cut-off level to control the second output thin film transistor to be cut off.
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| CN112071861A (en) * | 2020-09-03 | 2020-12-11 | Tcl华星光电技术有限公司 | Array substrate, preparation method thereof and liquid crystal display panel |
| CN114973302A (en) | 2021-02-18 | 2022-08-30 | 群创光电股份有限公司 | Biometric sensing device and display device including the same |
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