CN110687709A - Display device and driving method thereof - Google Patents
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- CN110687709A CN110687709A CN201910879178.0A CN201910879178A CN110687709A CN 110687709 A CN110687709 A CN 110687709A CN 201910879178 A CN201910879178 A CN 201910879178A CN 110687709 A CN110687709 A CN 110687709A
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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
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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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
- G02F1/136286—Wiring, e.g. gate line, drain line
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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Abstract
The invention provides a display device and a driving method thereof, wherein the display device comprises an array substrate and a color film substrate which are oppositely arranged, and a plurality of fingerprint identification sensors, fingerprint identification driving units and fingerprint identification control switches; the array substrate comprises a substrate and a plurality of grid signal wires arranged on the substrate, the fingerprint identification sensor is arranged on the substrate, and the fingerprint identification control switch is electrically connected with the fingerprint identification sensor, the fingerprint identification driving unit and the grid signal wires. The pixel in the display device and the fingerprint identification control switch of the fingerprint identification driving unit share the grid signal wiring mode, so that the fingerprint identification sensor is integrated on the array substrate, the optical fingerprint technology is conveniently integrated and applied to the display device, meanwhile, the fingerprint identification sensor and the display pixel are driven by the grid signal wiring, the GOA wiring in the display device is reduced, the etching process is reduced, and the cost is reduced.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display device and a driving method thereof.
Background
With the development requirements of smart phones and tablets, the fingerprint identification technology also becomes a big selling point of display terminals such as mobile phones and the like; the optical fingerprint identification technology is also a demand of each large display terminal at present.
At present, all the optical fingerprint identification is carried on an OLED screen, and an optical fingerprint sensor is arranged below the OLED screen; however, how to integrate the optical fingerprint technology into the LCD screen is still difficult to realize.
Disclosure of Invention
The invention provides a display device, which aims to solve the technical problem that how to integrate the optical fingerprint technology into an LCD screen is still difficult to realize.
In order to solve the above problems, the technical scheme provided by the invention is as follows:
a display device comprises an array substrate, a color film substrate, a plurality of fingerprint identification sensors, a fingerprint identification driving unit and a fingerprint identification control switch, wherein the array substrate and the color film substrate are oppositely arranged;
the array substrate comprises a substrate and a plurality of grid signal wires arranged on the substrate, the fingerprint identification sensor is arranged on the substrate, and the fingerprint identification control switch is electrically connected with the fingerprint identification sensor, the fingerprint identification driving unit and the grid signal wires.
Furthermore, the first end of the fingerprint identification control switch is electrically connected with the grid signal wiring, the second end of the fingerprint identification control switch is electrically connected with the fingerprint identification driving unit, the third end of the fingerprint identification control switch is electrically connected with the negative electrode of the fingerprint identification sensor, and the positive electrode of the fingerprint identification sensor is connected with a bias voltage.
Furthermore, the display device further comprises a first capacitor, a first end of the first capacitor is electrically connected to the first node together with the negative end of the fingerprint identification sensor and the third end of the fingerprint identification control switch, and a second end of the first capacitor is electrically connected to the positive end of the fingerprint identification sensor.
Furthermore, the fingerprint identification driving unit comprises a comparator, a second capacitor and a reset switch, wherein a positive input end of the comparator is connected with a reference voltage, a negative input end of the comparator, a first end of the second capacitor and a second end of the fingerprint identification control switch are electrically connected to a second node, and an output end of the comparator is electrically connected with a second end of the second capacitor; the first end of the reset switch is electrically connected with the first end of the second capacitor, and the second end of the reset switch is electrically connected with the second end of the second capacitor.
Furthermore, the fingerprint identification sensors are arranged at intervals and arranged according to an array, and the fingerprint identification control switch electrically connected with the fingerprint identification sensors in each row is correspondingly connected with one grid signal wire.
Furthermore, at least part of the grid signal wiring is electrically connected with the sub-pixels in a row and the fingerprint identification control switch in a row which is electrically connected with the fingerprint identification sensor.
Furthermore, the array substrate comprises a plurality of pixels distributed on the substrate in an array mode, and the fingerprint identification sensor is located between the adjacent pixels.
Furthermore, the array substrate comprises an array layer arranged on the substrate, a touch layer arranged on the array layer and a pixel electrode layer arranged on the touch layer, the array layer comprises the grid signal routing, and the fingerprint identification sensor is arranged between the pixel electrode layer and the color film substrate.
The invention also provides a driving method of the display device, which comprises the following steps:
s10, when fingerprint identification is needed, the potential of the grid signal wiring is at a high potential, the fingerprint identification control switch is turned on, the reset switch is in a closed state at the moment, the second capacitor in the fingerprint identification driving unit is charged, and the fingerprint identification driving unit collects the signal output by the output end of the comparator;
s20, after the reset switch is turned off to a set time, the fingerprint identification driving unit controls the reset switch to be turned on, and charges in the second capacitor are cleared to finish resetting;
and S30, the potential of the grid signal wire is reduced to a low potential, the fingerprint identification control switch is closed, and the fingerprint identification driving unit controls the reset switch to be closed.
Further, in the step S10, the second capacitor is charged with a photo-generated leakage current generated by the fingerprint sensor.
The invention has the beneficial effects that: the pixel in the display device and the fingerprint identification control switch of the fingerprint identification driving unit share the grid signal wiring mode, so that the fingerprint identification sensor is integrated on the array substrate, the optical fingerprint technology is conveniently integrated and applied to the display device, meanwhile, the fingerprint identification sensor and the display pixel are driven by the grid signal wiring, the GOA wiring in the display device is reduced, the etching process is reduced, and the cost is reduced.
Drawings
In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the distribution of gate signal traces and sub-pixels and fingerprint sensor in an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a fingerprint identification module according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a fingerprint identification module according to another embodiment of the present invention;
FIG. 5 is a schematic diagram of the distribution of sub-pixels and fingerprint identification sensors in a first embodiment of the present invention;
FIG. 6 is a schematic diagram of the distribution of sub-pixels and fingerprint identification sensors in a second embodiment of the present invention;
FIG. 7 is a schematic diagram of the distribution of sub-pixels and fingerprint identification sensors in a third embodiment of the present invention;
FIG. 8 is a schematic structural diagram of an array substrate according to an embodiment of the invention;
FIG. 9 is a schematic diagram of a driving timing sequence of the display device during fingerprint identification according to the present invention;
fig. 10 is a schematic diagram illustrating a driving procedure of a display device according to an embodiment of the invention.
Reference numerals:
10. an array substrate; 11. a substrate; 12. an array layer; 121. routing a grid signal; 13. a first insulating layer; 14. a touch layer; 15. a second insulating layer; 16. a pixel electrode layer; 17. a third insulating layer; 18. a pixel; 181. a sub-pixel; 20. a color film substrate; 30. a liquid crystal layer; 40. a fingerprint identification module; 41. a fingerprint recognition sensor; 42. a fingerprint identification control switch; 43. a fingerprint recognition driving unit; 431. a comparator; 432. a second capacitor; 433. a reset switch; 44. a first capacitor; 50. and a switch tube.
Detailed Description
The following description of the various embodiments refers to the accompanying drawings that illustrate specific embodiments in which the invention may be practiced. The directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], are only referring to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. In the drawings, elements having similar structures are denoted by the same reference numerals.
The invention aims at the technical problem that how to integrate and apply the optical fingerprint technology to the LCD screen is still difficult to realize in the existing LCD screen. The present invention can solve the above problems.
As shown in fig. 1, the display device includes an array substrate 10 and a color filter substrate 20 which are oppositely disposed, and a liquid crystal layer 30 disposed between the array substrate 10 and the color filter substrate 20.
As shown in fig. 2 and 3, the display device further includes a fingerprint recognition module 40, and the fingerprint recognition module 40 includes a plurality of fingerprint recognition sensors 41, a fingerprint recognition driving unit 43, and a fingerprint recognition control switch 42.
The display device may be a liquid crystal display device, and the fingerprint sensor 41 may be an optical fingerprint sensor.
The array substrate 10 includes a substrate 11 and a plurality of gate signal traces 121 disposed on the substrate 11, the array substrate 10 further includes a plurality of pixels 18 distributed in an array on the substrate 11, each pixel 18 includes at least one sub-pixel 181, the gate signal traces 121 are disposed in a transverse direction and are arranged at intervals in a longitudinal direction, and each gate signal trace 121 is electrically connected to a corresponding switch tube 50 of one row of the sub-pixels 181 to control the on/off of the switch tube 50.
The fingerprint sensor 41 is disposed on the substrate 11, and the fingerprint control switch 42 is electrically connected to the fingerprint sensor 41, the fingerprint driving unit 43 and the gate signal trace 121.
It should be noted that the fingerprint identification sensors 41 correspond to the fingerprint identification control switches 42 one by one and are electrically connected to each other.
It should be noted that, when the fingerprint identification function is completed or the fingerprint identification is not needed, the fingerprint identification sensor 41 does not work, the display device displays normally, the switching tube 50 electrically connected to the sub-pixel 181 is charged line by line through the gate signal routing 121, the display image is refreshed at a specific and high frequency, and the refresh frequency may be 60 hz; when the functions of fingerprint identification, fingerprint unlocking and the like are required, the refreshing frequency of a display picture is reduced, and the grid signal wiring 121 is used for charging the fingerprint identification control switch 42, so that the fingerprint identification control switch 42 is turned on to complete fingerprint identification.
By adopting the way of sharing the gate signal wiring 121 by the pixel 18 in the display device and the fingerprint control switch 42 of the fingerprint drive unit 43, the fingerprint sensor 41 is integrated on the array substrate 10, so that the optical fingerprint technology is conveniently integrated and applied to the display device, and meanwhile, the drive of the fingerprint sensor 41 and the drive of the display pixel 18 can be realized by the gate signal wiring 121, thereby reducing the wiring of the GOA in the display device, reducing the etching process and lowering the cost.
In an embodiment, a first end of the fingerprint identification control switch 42 is electrically connected to the gate signal trace 121, a second end is electrically connected to the fingerprint identification driving unit 43, a third end is electrically connected to a negative electrode of the fingerprint identification sensor 41, and a positive electrode of the fingerprint identification sensor 41 is connected to a bias voltage Vbias.
Specifically, the fingerprint identification driving unit 43 includes a comparator 431, a second capacitor 432, and a reset switch 433; a positive input terminal of the comparator 431 is connected to a reference voltage Vref, a negative input terminal of the comparator 431, a first terminal of the second capacitor 432 and a second terminal of the fingerprint identification control switch 42 are electrically connected to a second node S2, and an output terminal of the comparator 431 is electrically connected to the second terminal of the second capacitor 432; a first end of the reset switch 433 is electrically connected to a first end of the second capacitor 432, and a second end thereof is electrically connected to a second end of the second capacitor 432.
It should be noted that, when the voltage at the positive input terminal of the comparator 431 is greater than the voltage at the negative input terminal, the output terminal of the comparator 431 outputs a positive signal; when the voltage at the positive input terminal of the comparator 431 is less than the voltage at the negative input terminal, the output terminal of the comparator 431 outputs a negative signal; the reference voltage Vref corresponds to a predetermined fingerprint, and the voltage at the negative input terminal is the same as the potential of the second capacitor 432.
When functions such as fingerprint unlocking are needed to be realized through fingerprint identification, the finger is pressed on the area corresponding to the fingerprint identification sensor 41 on the display device, the fingerprint identification sensor 41 can generate photo-induced leakage current, the potential of the grid signal routing 121 is at a high potential, the fingerprint identification control switch 42 is turned on, the reset switch 433 is in a turned-off state at the moment, the second capacitor 432 in the fingerprint identification driving unit 43 is charged through the photo-induced leakage current, the fingerprint identification driving unit 43 collects signals output by the output end of the comparator 431, whether the identified fingerprint is a preset fingerprint is judged according to the signals output by the output end of the comparator 431, and if yes, the fingerprint unlocking is completed.
After the fingerprint identification is completed, the fingerprint identification driving unit 43 controls the reset switch 433 to be opened, and the charges in the second capacitor 432 are cleared to complete the reset; then the potential of the gate signal trace 121 drops to a low potential, the fingerprint identification control switch 42 is turned off, and the fingerprint identification driving unit 43 controls the reset switch 433 to be turned off.
It should be noted that the fingerprint sensor 41 itself generates a corresponding parasitic capacitance, and the generated photo-generated leakage current can be stored and accumulated in the parasitic capacitance, and then transmitted to the second capacitor 432 when the fingerprint control switch 42 is turned on.
In another embodiment, as shown in fig. 4, the display device further includes a first capacitor 44, a first terminal of the first capacitor 44 is electrically connected to the negative terminal of the fingerprint sensor 41 and the third terminal of the fingerprint control switch 42 at a first node S1, and a second terminal of the first capacitor 44 is electrically connected to the positive terminal of the fingerprint sensor 41.
In fingerprint recognition, a photo-generated leakage current generated by the fingerprint recognition sensor 41 is stored and accumulated in the first capacitor 44, and is transferred to the second capacitor 432 when the fingerprint recognition control switch 42 is turned on.
Specifically, the fingerprint identification sensors 41 are arranged at intervals and arranged in an array, and the fingerprint identification control switch 42 correspondingly connected to each of the fingerprint identification sensors 41 is correspondingly connected to one of the gate signal traces 121.
At least a portion of the gate signal traces 121 are electrically connected to the sub-pixels 181 and the fingerprint identification control switches 42 correspondingly connected to the fingerprint identification sensors 41.
It should be noted that the number of rows of the fingerprint sensor 41 may be smaller than the number of rows of the sub-pixels 181.
When fingerprint identification is needed, the gate signal wiring 121 charges the fingerprint identification control switch 42 line by line, so that the fingerprint identification control switch 42 is turned on line by line.
As shown in fig. 5 to 7, the fingerprint sensor 41 is located between the adjacent pixels 18.
In one embodiment, each of the pixels 18 includes a red sub-pixel (hereinafter "R sub-pixel"), a green sub-pixel (hereinafter "G sub-pixel"), and a blue sub-pixel (hereinafter "B sub-pixel").
In a first embodiment, as shown in fig. 5, the fingerprint sensor 41 is located between the longitudinal gaps between adjacent pixels 18.
In the second embodiment, as shown in fig. 6, the fingerprint recognition sensor 41 is disposed in parallel with the R, G, or B sub-pixels.
In a third embodiment, as shown in fig. 7, the fingerprint sensor 41 is located between the lateral gaps between adjacent pixels 18.
As shown in fig. 8, the array substrate 10 includes an array layer 12 disposed on the substrate 11, a touch layer 14 disposed on the array layer 12, and a pixel 18 electrode layer 16 disposed on the touch layer 14, wherein the array layer 12 includes the gate signal trace 121.
In one embodiment, the fingerprint sensor 41 is disposed between the pixel 18 electrode layer 16 and the color filter substrate 20.
In one embodiment, a first insulating layer 13 is disposed on the array layer 12, and the touch layer 14 is disposed on the first insulating layer 13; a second insulating layer 15 is arranged on the touch layer 14, and the pixel 18 electrode layer 16 is arranged on the second insulating layer 15; a third insulating layer 17 is disposed on the electrode layer 16 of the pixel 18, and the fingerprint sensor 41 is disposed on the third insulating layer 17.
In an embodiment, the switch tube 50 is disposed in the array layer 12, the fingerprint identification control switch 42 and the switch tube 50 are of the same type and disposed on the same layer, and the fingerprint identification sensor 41 may be electrically connected to the fingerprint identification control switch 42 through a via hole.
It should be noted that the fingerprint identification control switch 42 and the switch tube 50 may be thin film transistor switches.
As shown in fig. 9, fig. 9 is a schematic diagram of a driving timing of the display device during fingerprint identification.
The reset signal RSTRST is a control signal for controlling the fingerprint identification driving unit 43 to open by the fingerprint identification driving unit 43; CK 1-CK 4 are gate driving signals respectively sent by the GOA through the 4 rows of gate signal traces 121, and the pulse of each gate driving signal corresponds to one row of switching tubes 50 being turned on.
Specifically, the fingerprint identification sequentially comprises three stages of data acquisition, reset discharge and exposure and power storage.
In the data acquisition stage D1, the potential of the gate signal trace 121 is at a high potential, the fingerprint identification control switch 42 is turned on, the reset switch 433 is at a turned-off state, the photo-generated leakage current generated by the fingerprint identification sensor 41 charges the second capacitor 432 in the fingerprint identification driving unit 43, and the fingerprint identification driving unit 43 acquires the signal output by the output end of the comparator 431.
After the reset switch 433 is turned off to a set time, the reset discharge phase D2 is entered, at this time, the potential of the gate signal trace 121 is still at a high potential, the fingerprint identification control switch 42 remains on, the fingerprint identification driving unit 43 sends a reset signal RST at the high potential to the reset switch 433 to control the reset switch 433 to turn off, the fingerprint identification driving unit 43 controls the reset switch 433 to turn on, and the charges in the second capacitor 432 are cleared to complete the reset.
After the charges in the second capacitor 432 are cleared, the exposure and power storage stage D3 is entered, at this time, the potential of the gate signal trace 121 drops to a low potential, the fingerprint identification control switch 42 is turned off, the fingerprint identification driving unit 43 controls the reset switch 433 to be turned off, and the photo-generated leakage current generated by the fingerprint identification sensor 41 is stored in the parasitic capacitance of itself or the first capacitor 44.
When fingerprint recognition is required, the refresh frequency of the display screen needs to be reduced, and the longer the time of the exposure power storage phase D3 is correlated with the time of the exposure power storage phase D3, the lower the refresh frequency of the display screen is, and the minimum possible refresh frequency of the display screen can be reduced to 1 hz.
In the exposure and storage phase D3, the switching tube 50 of the sub-pixel 181 is in the off state, and when the touch layer 14 operates, the switching tube 50 of the sub-pixel 181 needs to be in the off state, so that the operating time of the touch layer 14 can be set in the exposure and storage phase D3, so that the touch layer 14 can operate at a sufficiently high reporting rate, and the operating performance of the touch layer 14 is satisfied.
It should be noted that the touch layer 14 may have a touch rate of 120 hz or 60 hz, and each touch may require a plurality of touch pulse cycles.
Based on the display device, the present invention further provides a driving method of a display device, as shown in fig. 10, including the following steps:
s10, when fingerprint identification is required, the potential of the gate signal trace 121 is at a high potential, the fingerprint identification control switch 42 is turned on, and the reset switch 433 is turned off, so as to charge the second capacitor 432 in the fingerprint identification driving unit 43, and the fingerprint identification driving unit 43 collects the signal output by the output terminal of the comparator 431;
after the S20 and the reset switch 433 are turned off to the set time, the fingerprint identification driving unit 43 controls the reset switch 433 to be turned on, and the charges in the second capacitor 432 are cleared to zero, thereby completing the reset;
s30, the gate signal trace 121 drops to a low potential, the fingerprint identification control switch 42 is turned off, and the fingerprint identification driving unit 43 controls the reset switch 433 to be turned off.
Further, in the step S10, the second capacitor 432 is charged by using the photo leakage current generated by the fingerprint sensor 41.
The invention has the beneficial effects that: by adopting the way of sharing the gate signal wiring 121 by the pixel 18 in the display device and the fingerprint control switch 42 of the fingerprint drive unit 43, the fingerprint sensor 41 is integrated on the array substrate 10, so that the optical fingerprint technology is conveniently integrated and applied to the display device, and meanwhile, the drive of the fingerprint sensor 41 and the drive of the display pixel 18 can be realized by the gate signal wiring 121, thereby reducing the GOA wiring in the display device, reducing the etching process and lowering the cost.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.
Claims (10)
1. The display device is characterized by comprising an array substrate, a color film substrate, a plurality of fingerprint identification sensors, a fingerprint identification driving unit and a fingerprint identification control switch, wherein the array substrate and the color film substrate are oppositely arranged;
the array substrate comprises a substrate and a plurality of grid signal wires arranged on the substrate, the fingerprint identification sensor is arranged on the substrate, and the fingerprint identification control switch is electrically connected with the fingerprint identification sensor, the fingerprint identification driving unit and the grid signal wires.
2. The display device according to claim 1, wherein a first terminal of the fingerprint identification control switch is electrically connected to the gate signal trace, a second terminal of the fingerprint identification control switch is electrically connected to the fingerprint identification driving unit, a third terminal of the fingerprint identification control switch is electrically connected to a negative electrode of the fingerprint identification sensor, and a positive electrode of the fingerprint identification sensor is connected to a bias voltage.
3. The display device according to claim 2, further comprising a first capacitor, wherein a first terminal of the first capacitor is electrically connected to the negative terminal of the fingerprint sensor and the third terminal of the fingerprint control switch at a first node, and a second terminal of the first capacitor is electrically connected to the positive terminal of the fingerprint sensor.
4. The display device according to claim 2 or 3, wherein the fingerprint identification driving unit comprises a comparator, a second capacitor and a reset switch, wherein a positive input terminal of the comparator is connected to a reference voltage, a negative input terminal of the comparator is electrically connected to a first terminal of the second capacitor and a second terminal of the fingerprint identification control switch at a second node, and an output terminal of the comparator is electrically connected to the second terminal of the second capacitor; the first end of the reset switch is electrically connected with the first end of the second capacitor, and the second end of the reset switch is electrically connected with the second end of the second capacitor.
5. The display device according to claim 1, wherein the fingerprint sensors are arranged at intervals and in an array, and the fingerprint control switches electrically connected to the fingerprint sensors in each row are correspondingly connected to a gate signal trace.
6. The display device according to claim 5, wherein at least a portion of the gate signal traces are electrically connected to the fingerprint identification control switches electrically connected to a row of sub-pixels and a row of fingerprint identification sensors at the same time.
7. The display device according to claim 5, wherein the array substrate comprises a plurality of pixels distributed on the substrate in an array, and the fingerprint sensor is located between adjacent pixels.
8. The display device according to claim 1, wherein the array substrate comprises an array layer disposed on the substrate, a touch layer disposed on the array layer, and a pixel electrode layer disposed on the touch layer, the array layer comprises the gate signal trace, and the fingerprint sensor is disposed between the pixel electrode layer and the color filter substrate.
9. A driving method of a display device, comprising the steps of:
s10, when fingerprint identification is needed, the potential of the grid signal wiring is at a high potential, the fingerprint identification control switch is turned on, the reset switch is in a closed state at the moment, the second capacitor in the fingerprint identification driving unit is charged, and the fingerprint identification driving unit collects the signal output by the output end of the comparator;
s20, after the reset switch is turned off to a set time, the fingerprint identification driving unit controls the reset switch to be turned on, and charges in the second capacitor are cleared to finish resetting;
and S30, the potential of the grid signal wire is reduced to a low potential, the fingerprint identification control switch is closed, and the fingerprint identification driving unit controls the reset switch to be closed.
10. The method for driving a display device according to claim 9, wherein in step S10, the second capacitor is charged with a photo-generated leakage current generated by the fingerprint sensor.
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| CN201910879178.0A CN110687709A (en) | 2019-09-18 | 2019-09-18 | Display device and driving method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113971817A (en) * | 2020-07-07 | 2022-01-25 | 联咏科技股份有限公司 | Fingerprint identification driving method of display panel |
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