CN108664907B - Array substrate, display panel and display device - Google Patents
Array substrate, display panel and display device Download PDFInfo
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- CN108664907B CN108664907B CN201810392687.6A CN201810392687A CN108664907B CN 108664907 B CN108664907 B CN 108664907B CN 201810392687 A CN201810392687 A CN 201810392687A CN 108664907 B CN108664907 B CN 108664907B
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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
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive 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
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- G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
- G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
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Abstract
The application discloses an array substrate, a display panel and a display device, and relates to the technical field of display, wherein the array substrate is provided with at least one fingerprint identification area, the fingerprint identification area is positioned in the display area, the fingerprint identification area comprises a plurality of fingerprint identification sensors which are arranged in an array manner along a first direction and a second direction, and the fingerprint identification sensors comprise first electrodes; the non-display area of the array substrate is also provided with a fingerprint identification driving circuit, and the fingerprint identification driving circuit comprises a plurality of groups of fingerprint identification driving units and switching units which are in one-to-one correspondence; the array substrate comprises a public electrode, the display stage is realized, the first electrode is multiplexed into the public electrode, and fingerprint identification detection signals are transmitted to the fingerprint identification sensor in the fingerprint identification stage. Therefore, the first electrode is multiplexed to be the existing common electrode on the array substrate, the fingerprint identification driving circuit is introduced, the manufacturing process flow can be reduced while the fingerprint identification function is achieved, the production cost is reduced, and the production efficiency is improved.
Description
Technical Field
The application relates to the technical field of display, in particular to an array substrate, a display panel and a display device.
Background
Human fingerprints have uniqueness and invariance, so that the fingerprint identification safety is high, and meanwhile, the fingerprint identification method is widely applied to various fields, such as the technical field of display, due to the fact that the fingerprint identification method is simple to operate. In the field of display technologies, a mobile phone is taken as an example, and unlocking or opening of a specific application program can be completed through fingerprint identification.
With the development of science and technology, a variety of display devices with fingerprint identification functions appear in the market, such as mobile phones, tablet computers, intelligent wearable devices and the like. Like this, the user just needs to touch display device's fingerprint identification module with the finger before the display device that the operation has the fingerprint identification function, just can carry out the authority and verify, has simplified the authority verification process.
Along with the development of full screen, become a trend in the display area with fingerprint identification module integration to display panel.
Disclosure of Invention
In view of this, the technical problem to be solved by the present application is to provide an array substrate, a display panel and a display device, in which a first electrode in a fingerprint identification sensor is reused as a common electrode on the array substrate, and a fingerprint identification driving circuit is introduced, so that the manufacturing process flow can be reduced while the fingerprint identification function is realized, the production cost is reduced, and the production efficiency is improved.
In order to solve the technical problem, the following technical scheme is adopted:
in a first aspect, the application provides an array substrate, which is provided with a display area and a non-display area arranged around the display area, wherein the array substrate is further provided with at least one fingerprint identification area, the fingerprint identification area is located in the display area, and the non-display area is provided with a control chip;
the fingerprint identification area comprises a plurality of fingerprint identification sensors arranged in an array along a first direction and a second direction, a plurality of switch units arranged in an array, a plurality of control signal lines extending along the first direction and arranged along the second direction, and a plurality of fingerprint identification signal lines extending along the second direction and arranged along the first direction, wherein the first direction and the second direction are crossed; the fingerprint identification sensor comprises first electrodes, wherein first ends of at least part of the switch units positioned on the same row are electrically connected with the same control signal line, second ends of at least part of the switch units positioned on the same column are electrically connected with the same fingerprint identification signal line, and third ends of the switch units are respectively and correspondingly electrically connected with the first electrodes one by one;
the non-display area of the array substrate is also provided with a fingerprint identification driving circuit, the fingerprint identification driving circuit comprises a plurality of groups of fingerprint identification driving units and switching units which are in one-to-one correspondence, the first end of each fingerprint identification driving unit is electrically connected with the control chip, and the second end of each fingerprint identification driving unit is electrically connected with the output end of the fingerprint identification driving circuit in one-to-one correspondence; the control end of each switching unit is electrically connected with the control chip, and the output end of each switching unit is electrically connected with the output end of the fingerprint identification driving circuit in a one-to-one correspondence manner; the output ends of the fingerprint identification driving circuits are respectively and electrically connected with the control signal lines of the fingerprint identification areas in a one-to-one correspondence manner;
the array substrate comprises a common electrode, the first electrode is multiplexed as the common electrode in a display stage, each control signal line simultaneously receives a gating signal sent by the switching unit, and a common voltage signal output by the control chip is simultaneously transmitted to each first electrode through each fingerprint identification signal line; in the fingerprint identification stage, the control signal lines sequentially receive the gating signals sent by the fingerprint identification driving unit, and when the first electrode connected with one control signal line is scanned, fingerprint identification detection signals output by the control chip are transmitted to a row of fingerprint identification sensors corresponding to the control signal line through the fingerprint identification signal line.
In a second aspect, the present application provides a display panel, including an array substrate and a color filter substrate that are arranged oppositely, and a liquid crystal filled between the array substrate and the color filter substrate, where the array substrate is the array substrate provided by the present application.
In a third aspect, the present application provides a display device, including a display panel, where the display panel is the display panel provided in the present application.
Compared with the prior art, this application array substrate, display module assembly and display device, reached following effect:
the application provides an array substrate, display module assembly and display device has introduced the fingerprint identification sensor in display panel's display area, and this fingerprint identification sensor does not occupy the area in non-display area, consequently is favorable to reducing display device's frame width, realizes narrow frame and comprehensive screen design. In addition, the first electrode in the fingerprint identification sensor multiplexes the common electrode on the array substrate, the common electrode plays a role in the display process, the fingerprint identification sensor receives a fingerprint identification detection signal in the fingerprint identification process, and the first electrode and the common electrode can be completed in the same process. In addition, in the fingerprint identification district that this application provided, be located same row at least partial switch unit and connect same control signal line, be located same column at least partial switch unit and connect same fingerprint identification signal line, this kind of wiring mode need not to set up different control signal line and fingerprint identification signal line respectively alone for each switch unit, consequently is favorable to sparingly wiring quantity, simplifies the wiring flow, further is favorable to practicing thrift manufacturing cost, improves production efficiency.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a top view of an array substrate according to an embodiment of the present disclosure;
FIG. 2 is a circuit diagram of a fingerprint sensor according to an embodiment of the present application;
fig. 3 is a circuit configuration diagram of a fingerprint identification driving circuit electrically connected to a fingerprint identification area according to an embodiment of the present application;
fig. 4 is a cross-sectional view taken along line a-a of an array substrate according to an embodiment of the present disclosure;
FIG. 5 is a diagram illustrating another circuit configuration of a fingerprint sensor according to an embodiment of the present application;
fig. 6 is a block diagram of a fingerprint identification driving unit according to an embodiment of the present disclosure;
FIG. 7 is a timing diagram illustrating operation of the fingerprint sensor;
FIG. 8 is a diagram illustrating another circuit structure of a fingerprint identification driving circuit according to an embodiment of the present application;
FIG. 9 is a diagram illustrating another circuit structure of a fingerprint identification driving circuit according to an embodiment of the present application;
FIG. 10 is a diagram illustrating another circuit structure of a fingerprint identification driving circuit according to an embodiment of the present application;
fig. 11 is a circuit structure diagram of a pixel electrode according to an embodiment of the present disclosure;
fig. 12 is a cross-sectional view of a display panel according to an embodiment of the present application;
fig. 13 is a schematic structural diagram of a display device according to an embodiment of the present disclosure.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result. Furthermore, the term "coupled" is intended to encompass any direct or indirect electrical coupling. Thus, if a first device couples to a second device, that connection may be through a direct electrical coupling or through an indirect electrical coupling via other devices and couplings. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
With the development of science and technology, a variety of display devices with fingerprint identification functions are available on the market. Along with the development of full screen, become a trend in the display area with fingerprint identification module integration to display panel.
In view of this, the present application provides an array substrate, a display panel and a display device, which reuse a first electrode in a fingerprint identification sensor as an existing common electrode on the array substrate, and introduce a fingerprint identification driving circuit, so as to reduce a manufacturing process flow, reduce a production cost and improve a production efficiency while achieving a fingerprint identification function.
Fig. 1 is a top view of an array substrate according to an embodiment of the present disclosure, fig. 2 is a circuit configuration diagram of a fingerprint sensor according to an embodiment of the present disclosure, fig. 3 is a circuit configuration diagram of a fingerprint driving circuit according to an embodiment of the present disclosure electrically connected to a fingerprint identification area, and with reference to fig. 1, fig. 2 and fig. 3, an array substrate 100 according to an embodiment of the present disclosure is provided, which includes a display area 11 and a non-display area 12 disposed around the display area 11, the array substrate 100 further includes at least one fingerprint identification area 13, the fingerprint identification area 13 is disposed in the display area 11, and the non-display area 12 is disposed with a control chip 14;
referring to fig. 2, the fingerprint identification area 13 includes a plurality of fingerprint identification sensors 20 arranged in an array along a first direction and a second direction, a plurality of switch units 40 arranged in an array, a plurality of control signal lines 31 extending along the first direction and arranged along the second direction, and a plurality of fingerprint identification signal lines 32 extending along the second direction and arranged along the first direction, the first direction and the second direction being crossed; the fingerprint identification sensor 20 comprises a first electrode 21, wherein first ends 41 of at least some switch units 40 positioned in the same row are electrically connected with the same control signal line 31, second ends 42 of at least some switch units 40 positioned in the same column are electrically connected with the same fingerprint identification signal line 32, and third ends 43 of all switch units 40 are respectively and correspondingly electrically connected with the first electrode 21;
referring to fig. 3, the non-display region 12 of the array substrate 100 is further provided with a fingerprint identification driving circuit 50, the fingerprint identification driving circuit 50 includes a plurality of sets of fingerprint identification driving units 51 and switching units 52 corresponding to each other one by one, a first end 511 of each fingerprint identification driving unit 51 is electrically connected to the control chip 14, and a second end 512 of each fingerprint identification driving unit 51 is electrically connected to an output end 501 of the fingerprint identification driving circuit 50 corresponding to each other one by one; the control end 521 of each switching unit 52 is electrically connected with the control chip 14, and the output end 523 of each switching unit 52 is electrically connected with the output end of the fingerprint identification driving circuit 50 in a one-to-one correspondence manner; the output ends 501 of the fingerprint identification driving circuits 50 are electrically connected with the control signal lines 31 of the fingerprint identification area 13 in a one-to-one correspondence manner;
the array substrate 100 includes a common electrode 71, referring to fig. 4, fig. 4 is an a-a cross-sectional view of the array substrate provided in the embodiment of the present application, and in the display stage, referring to fig. 3, the first electrode 21 is multiplexed as the common electrode 71, each control signal line 31 simultaneously receives the gate signal sent by the switching unit 52, and the common voltage signal output by the control chip 14 is simultaneously transmitted to each first electrode 21 through each fingerprint identification signal line 32; in the fingerprint identification stage, the control signal lines 31 sequentially receive the gate signals sent by the fingerprint identification driving unit 51, and when scanning the first electrode 21 connected to one control signal line 31, the fingerprint identification detection signal output by the control chip 14 is transmitted to the row of fingerprint identification sensors 20 corresponding to the control signal line 31 through the fingerprint identification signal line 32.
Specifically, referring to fig. 1, the present application introduces a fingerprint identification area 13 in the display area 11, implementing the fingerprint identification function of the display panel 300. In the process of fingerprint identification, when a touch main body (finger fingerprint) touches, a capacitor can be generated between the touch main body and the fingerprint identification sensor, and because the touch main body consists of a series of ridges and valleys on the surface of the skin at the finger end, the distances between the ridges and the valleys and the fingerprint identification sensor are different, so that the ridges and the valleys respectively generate different capacitance with the fingerprint identification sensor, and the fingerprint identification can be performed according to the capacitance.
Particularly, in the embodiment of the application, the fingerprint identification area 13 is disposed in the display area 11, and the introduction of the fingerprint identification area 13 does not occupy the non-display area 12 (i.e., the frame area) of the array substrate 100, which is beneficial to realizing the narrow frame design of the array substrate 100, and is beneficial to realizing the design of a full-screen while realizing the fingerprint identification function. In addition, referring to fig. 4, since the array substrate 100 is provided with the common electrode 71 layer for providing the common voltage in the display process, the first electrode 21 in the fingerprint identification sensor 20 is multiplexed with the common electrode 71 on the array substrate 100 in the embodiment of the present application, referring to fig. 3, the switching unit 52 in the fingerprint identification driving circuit 50 switches between the display stage and the fingerprint identification stage, in the display stage, the switch units 40 connected to the first electrodes 21 are simultaneously turned on, and the common voltage signal output by the control chip 14 is simultaneously transmitted to each first electrode 21; in the fingerprint recognition stage, the fingerprint recognition sensor 20 is turned on line by line, and receives fingerprint recognition detection signals line by line. The first electrode 21 and the common electrode 71 are multiplexed, and the first electrode 21 and the common electrode 71 can be completed in the same process, so that the design is favorable for simplifying the production flow, saving the production cost and improving the production efficiency while realizing the fingerprint identification function. In addition, in the fingerprint identification area 13 provided by the application, at least some switch units 40 located in the same row are connected with the same control signal line 31, and at least some switch units 40 located in the same column are connected with the same fingerprint identification signal line 32, and this kind of wiring mode need not to set up different control signal lines and fingerprint identification signal lines separately for each switch unit 40, so it is favorable to saving wiring quantity, simplifies wiring flow, further is favorable to saving production cost, and improves production efficiency.
It should be noted that the size of the fingerprint identification area 13 and the number and size of the fingerprint identification sensors 20 included in the fingerprint identification area 13 in the drawings of the present application are only schematic illustrations, and do not represent actual sizes and numbers.
In the embodiment shown in fig. 2, for the switch units 40 in the same row, taking the switch unit 40 in the first row as an example, the first ends 41 of some switch units 40 are connected to the control signal line 311, and the first ends 41 of other switch units 40 are connected to the control signal line 312; in the same column of switch units 40, taking the first column of switch units 40 as an example, the second ends 42 of some switch units 40 are connected to the data signal line 321, and the second ends 42 of other switch units 40 are connected to the data signal line 322. In addition to this, fig. 5 shows another circuit structure diagram of the fingerprint sensor 20 provided in the present embodiment, in which the first terminals 41 of the switch units 40 in the same row are electrically connected to the same control signal line 31, and the second terminals 42 of the switch units 40 in the same column are electrically connected to the same fingerprint signal line 32. Considering that the fingerprint identification area 13 is disposed in the display area 11, and the size of the fingerprint identification area 13 is much smaller than that of the display area 11, the size of the fingerprint identification sensor 20 can be set as small as possible, even the same as the design size of the sub-pixels, thus, when the size of the fingerprint identification area 13 is much smaller than the size of the display area 11, the number of fingerprint identification sensors 20 located in the fingerprint identification area 13 is also much smaller than the number of sub-pixels, therefore, the requirement can be satisfied by adopting a single-side driving mode (the fingerprint identification driving circuit is positioned at the same side of the fingerprint identification area, the switch units in the same row are connected with the same control signal line), the switch units 40 in the same row are connected with the same control signal line 31 in the embodiment of the application, and the switch units 40 in the same column are connected with the same fingerprint identification signal line 32 in a simple and feasible way, which is beneficial to simplifying the production process. Specifically, in the display stage or the fingerprint identification stage, each row of switch units 40 can receive a gating signal through the shared control signal line 31, after gating, each row of switch units 40 can respectively receive a common voltage signal or a fingerprint identification detection signal through the shared fingerprint identification signal line 32, and therefore the display function of the fingerprint identification area in the display stage is achieved with the least wiring quantity, the fingerprint identification function is achieved in the fingerprint identification stage, the wiring quantity of the fingerprint identification area is small, the production cost is saved, meanwhile, the complexity of wiring is facilitated to be simplified, the wiring difficulty is reduced, the wiring flow is facilitated to be simplified, the wiring efficiency is improved, and the production efficiency of the array substrate is further facilitated to be improved.
Optionally, fig. 6 is a block diagram of a fingerprint identification driving unit provided IN the embodiment of the present application, where the fingerprint identification driving unit 51 includes a latch unit 513, a nand gate 514, an output unit 515, a first signal input terminal IN, a first clock signal input terminal CKVA, a second clock signal input terminal CKVB, a first signal output terminal NEXT, and a second signal output terminal GOUT;
the first signal input terminal IN and the first clock signal input terminal CKVA are respectively connected to the latch unit 513, and a first output terminal of the latch unit 513 is used as a first signal output terminal NEXT; a second output end of the latch unit 513 and a second clock signal input end CKVB are respectively connected to the nand gate 514, and an output end of the nand gate 514 is connected to the output unit 515; an output terminal of the output unit 515 is connected to a second terminal of the fingerprint identification driving unit 51 as a second signal output terminal GOUT.
Typically, the fingerprint recognition drive units 51 are cascade-connected. The first signal input terminal IN, the first clock signal input terminal CKVA, and the second clock signal input terminal CKVB of the fingerprint identification driving unit 51 are all connected to the control chip 14, the control chip 14 provides corresponding gating signals or clock signals, the first signal output terminal NEXT is connected to the NEXT-stage fingerprint identification driving unit 51, and sends a shift signal to the NEXT-stage fingerprint identification driving unit 51, and the fingerprint identification driving unit 51 sends the gating signals to the control lines one by one through the output terminals thereof, so that the fingerprint identification detection signals output by the control chip 14 are transmitted to the corresponding row of fingerprint identification sensors 20 through the fingerprint identification signal lines 32, thereby implementing the progressive scanning function of the first electrodes 21 connected to the control signal lines 31. Fig. 6 shows only one configuration of the fingerprint recognition driving unit 51, and other circuit configurations having the same function are also possible except for this configuration, and no specific limitation is applied thereto.
Alternatively, referring to fig. 3, the switching unit 52 includes a first thin film transistor 61, and the first thin film transistor 61 is an N-type thin film transistor; the gate 611 of the first thin film transistor 61 serves as the control terminal 521 of the switching unit 52, the first pole 612 of the first thin film transistor 61 is connected to the first level signal, and the second pole 613 of the first thin film transistor 61 serves as the output terminal of the switching unit 52; in the display stage, the control chip 14 inputs a high level signal to the control terminal 521 (i.e., the gate 611 of the first thin film transistor) of the switching unit 52, and the first level signal is transmitted to each switching unit 40 to gate each switching unit 40.
Optionally, with continued reference to fig. 3, in the fingerprint identification area 13, the switch unit 40 includes a third thin film transistor 63, and the third thin film transistor 63 is an N-type thin film transistor; the gate 41 of the third thin film transistor 63 serves as the first terminal 41 of the switching unit 40, the first pole 632 of the third thin film transistor 63 serves as the second terminal 42 of the switching unit 40, and the second pole 633 of the third thin film transistor 63 serves as the third terminal 43 of the switching unit 40.
Specifically, with reference to fig. 3, in this embodiment, the first thin film transistor 61 in the switching unit 52 and the third thin film transistor 63 in the switching unit 40 are both N-type thin film transistors, the first level signal is a high level signal, when the control chip 14 inputs the high level signal to the gate 611 of the first thin film transistor 61 in the switching unit 52, the first thin film transistor 61 in the switching unit 52 is turned on, and the high level signal VGH of the first pole 612 of the first thin film transistor 61 is transmitted to the first end 41 of the switching unit 40 through the second pole 613 thereof, so that the third thin film transistor 63 in the switching unit 40 is turned on. Thus, the control chip 14 can send the common voltage signal to the first electrode 21 through the fingerprint identification signal line 32 to the second end connected to the fingerprint identification signal line 32, and at this time, the first electrode 21 is reused as the common electrode 71, so that the normal display function of the array substrate 100 is realized.
Fig. 7 is a schematic diagram illustrating an operation process of the fingerprint sensor 20 corresponding to fig. 3, and fig. 7 is a timing chart illustrating the operation of the fingerprint sensor, wherein at this time, the first thin film transistor 61 and the third thin film transistor 63 are both N-type thin film transistors, VCOMSW represents a level signal sent from the control chip 14 to the control terminal 521 of the switching unit 52, and TX is a level signal of the first electrode 21. Referring to fig. 7, during the display period, VCOMSW is at high level, and at this time, the first tft 61 in each switching unit 52 is turned on, and the high level signal of the first pole 611 of the first tft 61 is transmitted to the first terminal 41 of the switching unit 40, so that the N-type third tft 63 in the switching unit 40 is turned on, and at this time, the control chip 14 can send the common voltage signal to each first electrode 21 through the fingerprint identification signal line 32, so that each first electrode 21 receives the common voltage signal; in the fingerprint identification phase, VCOMSW is at a low level, at this time, the first thin film transistor 61 in each switching unit 52 is turned off, the control signal line 31 sequentially receives the gate signal sent by the fingerprint identification driving unit 51, since the switching unit 40 is an N-type thin film transistor, the gate signal received by the control signal line 31 is a high level signal, the high level signal enables the switching unit 40 to gate line by line, the control chip 14 sends a fingerprint identification detection signal to the first electrode 21 line by line via the fingerprint identification signal line 32, the first electrode 21 determines whether a touch subject touches the screen after receiving the fingerprint identification detection signal, and if a touch occurs, a voltage signal between the first electrode 21 and the touch subject (a valley or a ridge of a finger fingerprint) is transmitted to the control chip, thereby realizing the fingerprint identification.
Alternatively, fig. 8 shows another circuit architecture diagram of the fingerprint identification driving circuit provided in the embodiment of the present application, referring to fig. 8, when the first thin film transistor 61 is an N-type thin film transistor, the third thin film transistor 63 corresponding to the switch unit 40 may also be embodied as a P-type thin film transistor, and the first level signal connected to the first pole 611 of the first thin film transistor 61 is a low level signal VGL. In the display phase, when the driving chip inputs a high level signal to the first thin film transistor 61, the first thin film transistor 61 is turned on, so that the low level signal VGL connected to the first electrode 611 is transmitted to the third thin film transistor 63 in the switching unit 40, and the third thin film transistor 63 is turned on. In the fingerprint recognition stage, when the control chip 14 inputs a low-level signal to the first thin film transistor 61, the first thin film transistor 61 is turned off.
Alternatively, fig. 9 is another circuit architecture diagram of the fingerprint identification driving circuit provided in the embodiment of the present application, and the switching unit 52 includes a second thin film transistor 62, where the second thin film transistor 62 is a P-type thin film transistor; a gate 621 of the second thin film transistor 62 is used as a control terminal 521 of the switching unit 52, a first pole 622 of the second thin film transistor 62 is connected to the second level signal, and a second pole 623 of the second thin film transistor 62 is used as an output terminal 523 of the switching unit 52; in the display stage, the control chip 14 inputs a low level signal to the control terminal 521 of the switching unit 52 (i.e., the gate 621 of the second thin film transistor 62), and the second level signal is transmitted to each switching unit 40, so that each switching unit 40 is turned on.
Optionally, the switching unit 40 includes a third thin film transistor 63, and the third thin film transistor 63 is an N-type thin film transistor; the gate 631 of the third thin film transistor 63 serves as the first terminal 41 of the switching unit 40, the first pole 632 of the third thin film transistor 63 serves as the second terminal 42 of the switching unit 40, and the second pole 633 of the third thin film transistor 63 serves as the third terminal 43 of the switching unit 40.
Specifically, please refer to fig. 9, the second tft 62 in the switching unit 52 is a P-type tft, the third tft 63 in the switching unit 40 is an N-type tft, the first pole 622 of the second tft 62 is connected to the high level signal VGH, during the display period, VCOMSW is a low level signal, the second tft 62 is turned on, and the high level signal VGH of the first pole 622 of the second tft 62 is transmitted to the third tft 63 of the switching unit 40, so that the third tft 63 is turned on; in the fingerprint recognition phase, VCOMSW is a high signal and second TFT 62 is turned off.
Of course, when the switching unit 52 includes the second thin film transistor as a P-type thin film transistor, the third thin film transistor 63 in the switching unit 40 can also be a P-type thin film transistor, please refer to fig. 10, and fig. 10 shows another circuit architecture diagram of the fingerprint identification driving circuit provided in the embodiment of the present application. In this embodiment, the first pole 622 of the second thin film transistor 62 is connected to the low level signal VGL, during the display period, VCOMSW is a low level signal, the second thin film transistor 62 is turned on, and the low level signal VGL of the first pole 622 of the second thin film transistor 62 is transmitted to the third thin film transistor 63 of the switch unit 40 to turn on the third thin film transistor 63; in the fingerprint recognition phase, VCOMSW is a high signal and second TFT 62 is turned off.
Optionally, with continuing reference to fig. 4, the array substrate 100 provided in this embodiment of the present application includes a substrate 75, and a driving function layer 76 and an electrode layer 70 sequentially disposed on the substrate 75 along a direction perpendicular to a plane of the substrate 75, where the third thin film transistor 63 in the switch unit 40 of the present application is located in the driving function layer 76, and the common electrode 71 is located in the electrode layer 70.
Optionally, referring to fig. 4 and fig. 11, fig. 11 is a circuit structure diagram of a pixel electrode according to an embodiment of the present disclosure, where the electrode layer 70 further includes a plurality of pixel electrodes 72 arranged in an array, the plurality of pixel electrodes 72 are located in the same layer, and the pixel electrodes 72 and the common electrode 71 are insulated from each other;
the array substrate 100 further includes a plurality of fourth thin film transistors 74 arranged in an array, a plurality of gate lines 81 extending along the first direction and arranged along the second direction, and a plurality of data signal lines 82 extending along the second direction and arranged along the first direction, wherein each of the fourth thin film transistors 74 is located in the driving function layer 76; the gates 721 of the fourth tfts 74 in the same row are connected to the same gate line 81, the first poles 722 of the fourth tfts 74 in the same column are connected to the same data signal line 82, and the second poles 723 of the fourth tfts 74 are electrically connected to the pixel electrodes 72 in a one-to-one correspondence.
In the display process, the control chip 14 sends a gating signal to the fourth thin film transistor 74 row by row through the gate line 81, when scanning the pixel electrode 72 connected with one gate line 81, the display signal output by the control chip 14 is transmitted to one row of pixel electrodes 72 corresponding to the one gate line 81 through the gate line 81, an electric field for driving liquid crystal to deflect is formed between the pixel electrode 72 and the common electrode 71, so that light rays penetrate through the opening area of the array substrate, and picture display is realized.
Optionally, with continued reference to fig. 1, the control chip 14 is located in the non-display area 12 on the first side of the display area 11, and the fingerprint identification area 13 is located on the side of the display area 11 close to the control chip 14. When the fingerprint identification area 13 is arranged at one side close to the control chip 14, a user can realize a fingerprint identification function at the position of the display area 11 at one side close to the control chip 14, and the design accords with the operation habit of the user. In addition, when the fingerprint identification area 13 is arranged close to the control chip 14, the length of a stay wire between the fingerprint identification area 13 and the control chip 14 is favorably reduced, and the production cost is favorably reduced. Of course, the fingerprint identification area 13 may also be located at other positions of the display area 11, and the fingerprint identification function can also be implemented, which is not specifically limited in this application.
Optionally, the area of the fingerprint identification area 13 in fig. 1 is a × b, where a is greater than or equal to 6mm and less than or equal to 10mm, and b is greater than or equal to 6mm and less than or equal to 10 mm. Set up fingerprint identification district 13 to above-mentioned size within range, can satisfy the requirement of fingerprint identification process to the size, and the area of the shared display area 11 of this kind of size is less, because the introduction of fingerprint identification district 13 can increase switch unit and relevant line of walking in the display area, the penetration rate that the introduction of switch unit and line of walking can lead to display panel descends, when this application designs the area in fingerprint identification district for above-mentioned size, can realize the fingerprint identification function, avoided the too big comparatively serious problem that descends of the display area 11 penetration rate that corresponds in fingerprint identification district 13 that leads to of fingerprint identification district 13 again.
Optionally, the number of fingerprint identification sensors 20 in the fingerprint identification area 13 in fig. 1 is c × d, where c represents the number of rows of fingerprint identification sensors 20, d represents the number of columns of fingerprint identification sensors 20, c is greater than or equal to 120 ≦ 200, and d is greater than or equal to 120 ≦ 200. Typically, the size of one fingerprint sensor 20 is 50 μm by 50 μm, and when the area of the fingerprint identification region is set to a b, where a is 6mm or less and a is 10mm or less, and b is 6mm or less and b is 10mm or less, the number of fingerprint sensors 20 that can be placed in the fingerprint identification region 13 is within the above value range.
Based on the same inventive concept, the present application provides a display panel 300, and fig. 12 is a cross-sectional view of the display panel provided in the embodiment of the present application, referring to fig. 12, the display panel 300 includes an array substrate 100 and a color filter substrate 200 that are oppositely disposed, and a liquid crystal 301 filled between the array substrate 100 and the color filter substrate 200, where the array substrate 100 is the array substrate 100 provided in the embodiment of the present application. In the present application, the embodiment of the display panel 300 can refer to the embodiment of the array substrate 100, and repeated descriptions are omitted here.
Based on the same inventive concept, the present application further provides a display device 400, and fig. 13 is a schematic structural diagram of the display device provided in the embodiment of the present application, where the display device 400 includes a display panel 300, and the display panel 300 is the display panel provided in the embodiment of the present application. In the present application, the embodiment of the display device 400 can refer to the embodiment of the array substrate 100, and repeated descriptions are omitted here. It should be noted that the display device 400 provided in the embodiment of the present application may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
According to the embodiments, the application has the following beneficial effects:
the array substrate, display module assembly and display device that this application embodiment provided have introduced the fingerprint identification sensor in display panel's display area, and this fingerprint identification sensor does not occupy the area in non-display area, consequently is favorable to reducing display device's frame width, realizes narrow frame and comprehensive screen design. In addition, the first electrode in the fingerprint identification sensor multiplexes the common electrode on the array substrate, the common electrode plays a role in the display process, the fingerprint identification sensor receives a fingerprint identification detection signal in the fingerprint identification process, and the first electrode and the common electrode can be completed in the same process. In addition, in the fingerprint identification district that this application provided, be located same row at least partial switch unit and connect same control signal line, be located same column at least partial switch unit and connect same fingerprint identification signal line, this kind of wiring mode need not to set up different control signal line and fingerprint identification signal line respectively alone for each switch unit, consequently is favorable to sparingly wiring quantity, simplifies the wiring flow, further is favorable to practicing thrift manufacturing cost, improves production efficiency.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (11)
1. An array substrate is provided with a display area and a non-display area arranged around the display area, and is characterized in that the array substrate is also provided with at least one fingerprint identification area, the fingerprint identification area is positioned in the display area, and the non-display area is provided with a control chip;
the fingerprint identification area comprises a plurality of fingerprint identification sensors arranged in an array along a first direction and a second direction, a plurality of switch units arranged in an array, a plurality of control signal lines extending along the first direction and arranged along the second direction, and a plurality of fingerprint identification signal lines extending along the second direction and arranged along the first direction, wherein the first direction and the second direction are crossed; the fingerprint identification sensor comprises first electrodes, first ends of the switch units positioned on the same row are electrically connected with the same control signal line, second ends of the switch units positioned on the same column are electrically connected with the same fingerprint identification signal line, and third ends of the switch units are respectively and correspondingly electrically connected with the first electrodes one by one;
the non-display area of the array substrate is also provided with a fingerprint identification driving circuit, the fingerprint identification driving circuit comprises a plurality of groups of fingerprint identification driving units and switching units which are in one-to-one correspondence, the first end of each fingerprint identification driving unit is electrically connected with the control chip, and the second end of each fingerprint identification driving unit is electrically connected with the output end of the fingerprint identification driving circuit in one-to-one correspondence; the control end of each switching unit is electrically connected with the control chip, and the output end of each switching unit is electrically connected with the output end of the fingerprint identification driving circuit in a one-to-one correspondence manner; the output ends of the fingerprint identification driving circuits are respectively and electrically connected with the control signal lines of the fingerprint identification areas in a one-to-one correspondence manner;
the array substrate comprises a common electrode, the first electrode is multiplexed as the common electrode in a display stage, each control signal line simultaneously receives a gating signal sent by the switching unit, and a common voltage signal output by the control chip is simultaneously transmitted to each first electrode through each fingerprint identification signal line; in the fingerprint identification stage, the control signal lines sequentially receive gating signals sent by the fingerprint identification driving unit, and when the first electrode connected with one control signal line is scanned, fingerprint identification detection signals output by the control chip are transmitted to a row of fingerprint identification sensors corresponding to the control signal line through the fingerprint identification signal line;
the fingerprint identification driving unit comprises a latch unit, a NAND gate, an output unit, a first signal input end, a first clock signal input end, a second clock signal input end, a first signal output end and a second signal output end;
the first signal input end and the first clock signal input end are respectively connected with the latch unit, and a first output end of the latch unit is used as the first signal output end; the second output end of the latch unit and the second clock signal input end are respectively connected with the NAND gate, and the output end of the NAND gate is connected with the output unit; the output end of the output unit is used as the second signal output end and is connected to the second end of the fingerprint identification driving unit.
2. The array substrate of claim 1, wherein the switching unit comprises a first thin film transistor, the first thin film transistor being an N-type thin film transistor; a grid electrode of the first thin film transistor is used as a control end of the switching unit, a first pole of the first thin film transistor is connected with a first level signal, and a second pole of the first thin film transistor is used as an output end of the switching unit;
in the display stage, the control chip inputs a high level signal to the control end of the switching unit, and the first level signal is transmitted to each switching unit to enable each switching unit to be gated.
3. The array substrate of claim 1, wherein the switching unit comprises a second thin film transistor, the second thin film transistor being a P-type thin film transistor; a gate of the second thin film transistor is used as a control end of the switching unit, a first pole of the second thin film transistor is connected with a second level signal, and a second pole of the second thin film transistor is used as an output end of the switching unit;
in the display stage, the control chip inputs a low level signal to the control end of the switching unit, and the second level signal is transmitted to each switching unit to enable each switching unit to be gated.
4. The array substrate of claim 2 or 3, wherein the switch unit comprises a third thin film transistor, and the third thin film transistor is an N-type thin film transistor or a P-type thin film transistor; the gate of the third thin film transistor is used as the first terminal of the switch unit, the first pole of the third thin film transistor is used as the second terminal of the switch unit, and the second pole of the third thin film transistor is used as the third terminal of the switch unit.
5. The array substrate of claim 4, wherein the array substrate comprises a substrate, and a driving function layer and an electrode layer sequentially disposed on the substrate along a direction perpendicular to a plane of the substrate, the third thin film transistor is disposed on the driving function layer, and the common electrode is disposed on the electrode layer.
6. The array substrate of claim 5, wherein the electrode layer further comprises a plurality of pixel electrodes arranged in an array, the plurality of pixel electrodes are located in the same layer, and the pixel electrodes and the common electrode are insulated from each other;
the array substrate further comprises a plurality of fourth thin film transistors arranged in an array, a plurality of gate lines extending along the first direction and arranged along the second direction, and a plurality of data signal lines extending along the second direction and arranged along the first direction, wherein each fourth thin film transistor is positioned in the driving function layer; the grid electrodes of the fourth thin film transistors positioned on the same row are connected with the same grid line, the first poles of the fourth thin film transistors positioned on the same column are connected with the same data signal line, and the second poles of the fourth thin film transistors are respectively and correspondingly electrically connected with the pixel electrodes.
7. The array substrate of claim 1, wherein the control chip is located in a non-display area on a first side of the display area, and the fingerprint identification area is located on a side of the display area close to the control chip.
8. The array substrate of claim 1, wherein the area of the fingerprint identification area is a x b, wherein a is greater than or equal to 6mm and less than or equal to 10mm, and b is greater than or equal to 6mm and less than or equal to 10 mm.
9. The array substrate of claim 1, wherein the number of the fingerprint sensors in the fingerprint identification region is c x d, wherein c represents the number of rows of the fingerprint sensors, d represents the number of columns of the fingerprint sensors, c is 120 or more and is 200 or less, and d is 120 or more and is 200 or less.
10. A display panel, comprising an array substrate and a color filter substrate which are oppositely arranged, and a liquid crystal filled between the array substrate and the color filter substrate, wherein the array substrate is the array substrate of any one of claims 1 to 9.
11. A display device characterized by comprising the display panel according to claim 10.
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| US11847850B2 (en) | 2021-06-07 | 2023-12-19 | Wuhan China Star Optoelectronics Technology Co., Ltd. | Array substrate, manufacturing method thereof, and display device |
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| CN110929667B (en) * | 2019-11-29 | 2022-11-04 | 厦门天马微电子有限公司 | Display panel and display device |
| CN112133199B (en) * | 2020-09-29 | 2022-08-23 | 厦门天马微电子有限公司 | Display panel and display device |
| CN112951091B (en) * | 2021-02-09 | 2022-11-08 | 厦门天马微电子有限公司 | Display panel, driving method thereof and display device |
| CN113076839B (en) * | 2021-03-25 | 2022-08-23 | 厦门天马微电子有限公司 | Array substrate, display panel, display device and detection method of array substrate |
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