CN111881847A - Display panel, detection method thereof and display device - Google Patents

Display panel, detection method thereof and display device Download PDF

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Publication number
CN111881847A
CN111881847A CN202010753145.4A CN202010753145A CN111881847A CN 111881847 A CN111881847 A CN 111881847A CN 202010753145 A CN202010753145 A CN 202010753145A CN 111881847 A CN111881847 A CN 111881847A
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China
Prior art keywords
switch module
fingerprint identification
electrically connected
display panel
sub
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CN111881847B (en
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蔡选宪
蓝学新
蔡尚福
刘博智
吴加铅
黄敏
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Xiamen Tianma Microelectronics Co Ltd
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Xiamen Tianma Microelectronics Co Ltd
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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

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  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Image Input (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The embodiment of the invention discloses a display panel, a detection method thereof and a display device, wherein the display panel is provided with a plurality of first switch modules and a plurality of second switch modules; the input end of the first switch module is electrically connected with a first scanning signal line; the output end of each first switch module is electrically connected with the control end of at least one fingerprint identification unit, and the fingerprint identification units electrically connected with the same first switch module are positioned in the same row; each first switch module is switched on or switched off under the control of the first control signal; the input end of each second switch module is electrically connected with the output end of at least one fingerprint identification unit, and the fingerprint identification units electrically connected with the same second switch module are positioned in the same column; the output end of the second switch module is electrically connected with a data signal line; the second switch module is switched on or off under the control of the second control signal. The embodiment of the invention can detect the fingerprint identification unit in the display panel.

Description

Display panel, detection method thereof and display device
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel, a detection method thereof and a display device.
Background
Fingerprints are a pronoun for biometric identification due to their lifelong invariance, uniqueness and convenience. In particular, in the display device, functions such as unlocking and payment of the display device can be realized by performing fingerprint recognition on a user.
At present, in order to improve the screen occupation ratio and have the fingerprint identification function, the fingerprint identification unit is usually embedded in the display screen, and the fingerprint identification unit in the display screen and the pixels in the display screen can form a side of the substrate together. In the prior art, a dot screen test is usually performed on a finished or semi-finished display screen to determine whether pixels in the display screen can normally display light. When the fingerprint identification unit is embedded in the display screen, the pixel in the display screen and the fingerprint identification unit need to be tested at the same time. However, the dot screen test in the prior art can only realize the test of the pixels in the display screen, and cannot test the fingerprint identification unit. Therefore, how to test the fingerprint identification unit embedded in the display screen is a technical problem to be solved urgently at present.
Disclosure of Invention
In view of the above problems, embodiments of the present invention provide a display panel, a detection method thereof, and a display device, so as to implement detection of a fingerprint identification unit in the display panel with a simple structure.
In a first aspect, an embodiment of the present invention provides a display panel, including: a display area; the display area is provided with a plurality of sub-pixels arranged in an array, a plurality of data signal lines, a plurality of first scanning signal lines and a plurality of fingerprint identification units; the fingerprint identification unit is positioned at the gap between the sub-pixels; the sub-pixels positioned on the same row are electrically connected with the same first scanning signal line; the sub-pixels positioned in the same column are electrically connected with the same data signal line;
the display panel further comprises a plurality of first switch modules and a plurality of second switch modules;
the input end of the first switch module is electrically connected with one first scanning signal line; the output end of each first switch module is electrically connected with the control end of at least one fingerprint identification unit, and the fingerprint identification units electrically connected with the same first switch module are positioned in the same row; the control end of each first switch module receives a first control signal and is switched on or off under the control of the first control signal;
the input end of each second switch module is electrically connected with the output end of at least one fingerprint identification unit, and the fingerprint identification units electrically connected with the same second switch module are positioned in the same column; the output end of the second switch module is electrically connected with one data signal line; and the control end of the second switch module receives a second control signal and is switched on or off under the control of the second control signal.
In a second aspect, an embodiment of the present invention further provides a method for detecting a display panel, where the method is applied to the display panel, and the method at least includes: a first stage and a second stage;
in the first stage, the first control signal controls the first switch module to be switched on, the first scanning signal line transmits a first scanning signal to the sub-pixel and transmits the first scanning signal to the fingerprint identification unit through the switched-on first switch module, and the fingerprint identification unit is controlled to output a fingerprint identification detection signal; the second control signal controls the second switch module to be conducted, and the fingerprint identification detection signal is transmitted to the sub-pixel through the second switch module and the data signal line in sequence, so that the sub-pixel displays according to the fingerprint identification detection signal;
and in the second stage, determining the detection result of the fingerprint identification unit according to the display state of the sub-pixels.
In a third aspect, an embodiment of the present invention further provides a display device, including the display panel.
The display panel, the detection method thereof and the display device provided by the embodiment of the invention have the advantages that the first switch module and the second switch module are arranged in the display panel, when the fingerprint identification unit in the display panel is tested, the corresponding control signals can be adopted to respectively control the on-off of the first switch module and the second switch module, when the first switch module and the second switch module which are electrically connected with the same fingerprint identification unit are both on, the scanning signals transmitted by the scanning signal lines can be transmitted to the corresponding sub-pixels and can also be transmitted to the corresponding fingerprint identification unit through the first switch module, so that the fingerprint identification unit can output the corresponding fingerprint identification detection signals, and the fingerprint identification detection signals can be transmitted to the corresponding sub-pixels through the on second switch module, so that the sub-pixels can display according to the received fingerprint identification detection signals, whether the fingerprint identification unit is abnormal or not can be detected through the display light-emitting state of the sub-pixels, and when the fingerprint identification unit is abnormal and cannot meet the fingerprint identification requirement, the display panel can be processed in time to prevent the problem that the fingerprint identification unit cannot meet the fingerprint identification requirement in the use process after a chip is bound, so that the normal use of the display panel is influenced, the production yield is improved, and the cost is reduced; meanwhile, because the fingerprint identification units electrically connected with the same first switch module are positioned in the same row, and the fingerprint identification units electrically connected with the same second switch module are positioned in the same column, the detection of the fingerprint identification units in the corresponding row and the corresponding column can be realized according to the display luminous state of the sub-pixels in the corresponding row and the corresponding column, so that the abnormal condition of the fingerprint identification units at each position can be known, and a simple detection mode is adopted, so that the detection efficiency is higher; in addition, when the fingerprint identification unit is detected, the first scanning signal transmitted by the first scanning signal line is multiplexed, and a circuit for providing the scanning signal is not required to be additionally arranged for detecting the fingerprint identification unit, so that the structure of the display panel can be simplified, and the cost of the display panel is further reduced.
Drawings
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a film structure of a display panel according to an embodiment of the present invention;
FIG. 3 is an equivalent circuit diagram of a fingerprint identification unit according to an embodiment of the present invention;
FIG. 4 is a timing diagram illustrating a detection process of a display panel according to an embodiment of the present invention;
FIG. 5 is an equivalent circuit diagram of a fingerprint identification unit according to another embodiment of the present invention;
FIG. 6 is an equivalent circuit diagram of a fingerprint identification unit according to another embodiment of the present invention;
FIG. 7 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 10 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 11 is a flowchart illustrating a method for inspecting a display panel according to an embodiment of the present invention;
FIG. 12 is a flowchart illustrating a method for inspecting a display panel according to another embodiment of the present invention;
fig. 13 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As described in the background, in the prior art, a dot-screen test circuit is usually disposed in a display panel, and the dot-screen test circuit can only detect sub-pixels in the display panel, but cannot test a fingerprint identification unit in the display panel. If after binding the driver chip, in the use, discover that the fingerprint identification unit in the display panel is abnormal, can not satisfy the user demand, will influence the normal use of display panel, can scrap this display panel even, the driver chip who binds in the display panel this moment also can scrap thereupon to cause driver chip's waste, improve manufacturing cost.
To solve the above technical problem, an embodiment of the present invention provides a display panel, including a display area; the display area is provided with a plurality of sub-pixels arranged in an array, a plurality of data signal lines, a plurality of first scanning signal lines and a plurality of fingerprint identification units; the fingerprint identification unit is positioned at the gap between the sub-pixels; the sub-pixels positioned on the same row are electrically connected with the same first scanning signal line; the sub-pixels positioned in the same column are electrically connected with the same data signal line; the display panel further comprises a plurality of first switch modules and a plurality of second switch modules; the input end of the first switch module is electrically connected with a first scanning signal line; the output end of each first switch module is electrically connected with the control end of at least one fingerprint identification unit, and the fingerprint identification units electrically connected with the same first switch module are positioned in the same row; the control end of each first switch module receives a first control signal and is switched on or off under the control of the first control signal; the input end of each second switch module is electrically connected with the output end of at least one fingerprint identification unit, and the fingerprint identification units electrically connected with the same second switch module are positioned in the same column; the output end of the second switch module is electrically connected with a data signal line; the control end of the second switch module receives the second control signal and is switched on or off under the control of the second control signal.
By adopting the technical scheme, the first switch module and the second switch module are arranged, when the fingerprint identification unit in the display panel is tested, the corresponding control signals can be adopted to respectively control the connection or the disconnection of the first switch module and the second switch module, when the first switch module and the second switch module which are electrically connected with the same fingerprint identification unit are both connected, the scanning signals transmitted by the scanning signal lines can be transmitted to the corresponding sub-pixels and can also be transmitted to the corresponding fingerprint identification units through the first switch module, so that the fingerprint identification units can output the corresponding fingerprint identification detection signals, and the fingerprint identification detection signals can be transmitted to the corresponding sub-pixels through the connected second switch modules, so that the sub-pixels can display according to the received fingerprint identification detection signals, and at the moment, the luminous state can be displayed through the sub-pixels, whether the fingerprint identification unit is abnormal or not is detected, and when the fingerprint identification unit is abnormal and cannot meet the fingerprint identification requirement, the display panel can be processed in time to prevent the problem that the fingerprint identification unit cannot meet the fingerprint identification requirement in the use process after the chip is bound, so that the normal use of the display panel is influenced, the production yield is improved, and the cost is reduced; meanwhile, because the fingerprint identification units electrically connected with the same first switch module are positioned in the same row, and the fingerprint identification units electrically connected with the same second switch module are positioned in the same column, the detection of the fingerprint identification units in the corresponding row and the corresponding column can be realized according to the display luminous state of the sub-pixels in the corresponding row and the corresponding column, so that the abnormal condition of the fingerprint identification units at each position can be known, and a simple detection mode is adopted, so that the detection efficiency is higher; in addition, when the fingerprint identification unit is detected, the first scanning signal transmitted by the first scanning signal line is multiplexed, and a circuit for providing the scanning signal is not required to be additionally arranged for detecting the fingerprint identification unit, so that the structure of the display panel can be simplified, and the cost of the display panel is further reduced.
The above is the core idea of the present invention, and based on the embodiments of the present invention, a person skilled in the art can obtain all other embodiments without creative efforts, which belong to the protection scope of the present invention. The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
In the embodiment of the invention, the fingerprint identification unit can be a pixel gap only arranged in the fingerprint identification area of the display panel, so that the fingerprint identification area can carry out fingerprint identification and can also display a picture; or the fingerprint identification element may also be disposed in any pixel gap in the display area of the display panel to implement full-screen fingerprint identification, which is not specifically limited in the embodiment of the present invention. For convenience of description, the full screen fingerprint recognition is taken as an example for the following description.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention. As shown in fig. 1, the display panel 100 includes a display area 101, and a plurality of sub-pixels 10 arranged in an array, a plurality of data signal lines 52, a plurality of first scanning signal lines 51, and a plurality of fingerprint identification units 20 are disposed in the display area 101. The sub-pixels 10 in the same row are electrically connected to the same first scanning signal line 51, and the sub-pixels 10 in the same column are electrically connected to the same data signal line 52, so that when the first scanning signal 51 transmits an effective first scanning signal S1 (or S2, S3, S4, …) to the sub-pixels 10 in the corresponding row, the data signal transmitted by each data signal line 52 can be written into the sub-pixels 10 in the row, so that the sub-pixels 10 in the row can display. Correspondingly, the fingerprint identification unit 20 is located in the gap between the sub-pixels 10, that is, the fingerprint identification unit 20 is integrated in the display panel 100, and the fingerprint identification unit 20 is disposed in the non-opening area of the display area 101 in the display panel 100, and there is no fingerprint identification area separately disposed, so that the display panel 100 can still maintain a higher screen occupation ratio on the premise of having the fingerprint identification function. Accordingly, when the fingerprint unit 20 is integrated in the display panel 100, the corresponding structures in the fingerprint identification unit 20 may be formed using the same material in the same process as the corresponding structures in the sub-pixels.
Fig. 2 is a schematic diagram of a film structure of a display panel according to an embodiment of the present invention. As shown in fig. 1 and 2, the display panel 100 may include a substrate base 110, and a thin film transistor 120 and a common electrode layer 130 on one side of the substrate base 110. Wherein each sub-pixel 10 may include a pixel circuit 11 (the pixel circuit is represented by one thin film transistor in the figure) and a display unit (only a common electrode layer of the display unit is shown in the figure); and the fingerprint recognition unit 20 may include a fingerprint recognition element 21 and a fingerprint recognition driving circuit 22. The fingerprint recognition element 21 may be, for example, a photodiode including at least a first electrode, a second electrode, and a PIN junction between the first electrode and the second electrode. At this time, the fingerprint identification driving circuit 22 of the fingerprint identification unit 20 may be formed of the same material in the same process as the pixel circuit 11 of the sub-pixel 10; and the first electrode of the fingerprint identification element 21 of the fingerprint identification unit 20 may be disposed in the same layer as the common electrode layer of the display unit in the sub-pixel 10. Thus, the process of the display panel 100 can be simplified, and the manufacturing cost of the display panel 100 can be reduced; meanwhile, an additional film layer of the fingerprint recognition unit 20 is not required, thereby facilitating the lightness and thinness of the display panel 100.
It should be noted that fig. 1 and fig. 2 are only exemplary diagrams of the embodiment of the present invention, and in fig. 1, three sub-pixels 10 correspond to one fingerprint identification unit 20; in addition, one pixel may correspond to one fingerprint identification unit, or another corresponding relationship, which is not specifically limited in the embodiment of the present invention. Fig. 2 only exemplarily outputs a film layer relationship between a structure in the fingerprint identification unit and a structure in the sub-pixel, and the structure in the fingerprint identification unit and the structure in the sub-pixel may also be in other forms in the real-time embodiment of the present invention, which is not specifically limited in this embodiment of the present invention. In addition, in the embodiment of the present invention, the display panel may be a liquid crystal display panel or an organic light emitting display panel, and the display panel may also be other active matrix display panels.
With continued reference to fig. 1, the display panel 100 further includes a plurality of first switch modules 30 and a plurality of second switch modules 40. Wherein, the input end of the first switch module 30 is electrically connected with one first scanning signal line 51; the output end of each first switch module 30 is electrically connected with the control end of at least one fingerprint identification unit 20, and the fingerprint identification units 20 electrically connected with the same first switch module 30 are located in the same row; the control terminal of each first switch module 30 receives a first control signal G11(G12 or G13, …), and is turned on or off under the control of the first control signal G11(G12 or G13, …). The input end of each second switch module 40 is electrically connected with the output end of at least one fingerprint identification unit 20, and the fingerprint identification units 20 electrically connected with the same second switch module 40 are positioned in the same column; the output end of the second switch module 40 is electrically connected with a data signal line 52; the control terminal of the second switch module 40 receives a second control signal G21(G22 or G23, …), and is turned on or off under the control of the second control signal G21(G22 or G23, …).
Specifically, when the first control signal G11 controls the corresponding first switch module 30 to be turned on, and the second control signal G21 controls the corresponding second switch module 40 to be turned on, and the first scanning signal line 51 transmits the valid first scanning signal S1 to the sub-pixel 10 in the first row, the valid first scanning signal S1 is further transmitted to the fingerprint identification unit 20 electrically connected to the first switch module 30 through the turned-on first switch module 30, so that the fingerprint identification unit 20 can output the corresponding fingerprint identification detection signal when receiving the valid first scanning signal S1, and the fingerprint identification detection signal can be sequentially transmitted to the corresponding sub-pixel 10 through the turned-on second switch module 40 and the data signal line 52, so that the corresponding sub-pixel 10 can display according to the fingerprint identification detection signal; at this time, it is determined whether the fingerprint identification unit 20 corresponding to the sub-pixel 10 is abnormal or not according to the display light emission of the corresponding sub-pixel 10. In this way, the display luminescence of the sub-pixels 10 in the display panel 100 is utilized to realize the detection of the fingerprint identification unit 20 in the display panel 100, thereby simplifying the detection mode of the fingerprint identification unit 20 and having higher detection efficiency; meanwhile, when detecting the fingerprint identification unit 20, the first switch module 30 can transmit the first scanning signal transmitted by the first scanning signal line 51 to the corresponding sub-pixel 10, and transmit the first scanning signal to the control terminal of the fingerprint identification unit 20, so that the fingerprint identification unit 20 can output the corresponding fingerprint identification detection signal, that is, when detecting the fingerprint identification unit 20, the fingerprint identification unit 20 multiplexes the first scanning signal of the sub-pixel 10, so that it is not necessary to additionally provide a scanning signal line for detecting the fingerprint identification unit 20 in the display panel 100, which is beneficial to simplifying the structure of the display panel 100, and further, the cost of the display panel 100 can be reduced.
Accordingly, the output terminal of the first switch module 30 is electrically connected to the control terminal of at least one fingerprint identification unit 20 located in the same row, and the second switch module 40 is electrically connected to at least one fingerprint identification unit 20 located in the same column. Illustratively, if the fingerprint identification unit 20 is electrically connected to the first scanning signal line 51 electrically connected to the sub-pixel 10 in the first row through the corresponding first switch module 30, and is electrically connected to the data signal line 52 electrically connected to the sub-pixel 10 in the first column through the corresponding second switch module 40, the fingerprint identification detection signal output by the fingerprint identification unit 20 can be transmitted to the sub-pixels 10 in the first row and the first column through the turned-on second switch module 40 and data signal line 52, so that the sub-pixels 10 in the first row and the first column can be displayed according to the fingerprint identification detection signal output by the fingerprint identification unit 20; similarly, if the fingerprint identification unit 20 is electrically connected to the first scanning signal line 51 electrically connected to the sub-pixels 10 in the first row through the corresponding first switch module 30, and is electrically connected to the data signal line 52 electrically connected to the sub-pixels 10 in the second column through the corresponding second switch module 40, the fingerprint identification detection signal output by the fingerprint identification unit 20 can be transmitted to the sub-pixels 10 in the first row and the second column through the turned-on second switch module 40 and data signal line 52, so that the sub-pixels 10 in the first row and the second column can be displayed according to the fingerprint identification detection signal output by the fingerprint identification unit 20; analogize with this, the luminous condition of demonstration of each sub-pixel 10 of accessible, can judge the abnormal conditions of each fingerprint identification unit 20, thereby can detect the fingerprint identification unit 20 one-to-one in display panel 100, with fingerprint identification unit 20 in display panel 100 is unusual, and when unable fingerprint identification demand of satisfying, can in time return this display panel 100 factory to repair or scrap, just discover this display panel 100 can't satisfy the fingerprint identification demand after binding driver chip, thereby can in time the loss prevention, be favorable to reducing display panel 100's cost, further be favorable to improving the production yield.
The first control signals received by the control terminals of the first switch modules 30 may be the same or different. When the first control signals received by the first switch modules 30 electrically connected to different first scanning signal lines 51 are different and the first control signals received by the first switch modules 30 electrically connected to the same first scanning signal line 51 are the same, the first switch modules 30 electrically connected to the corresponding first scanning signal lines 51 can be sequentially controlled to be turned on while the first scanning signals 51 sequentially transmit effective first scanning signals to the sub-pixels 10 of the corresponding row, so that the first scanning signals transmitted by the first scanning signal lines 51 can be transmitted to the corresponding fingerprint identification unit 20 through the first switch modules 30, and the corresponding fingerprint identification unit 20 outputs a fingerprint identification detection signal; and when the first control signal received by each first switch module 30 in the display panel is the same, when detecting the fingerprint identification unit 20, all the first switch modules 30 are controlled to be turned on at the same time, the fingerprint identification unit 20 electrically connected with the first scanning signal line 51 for transmitting the effective first scanning signal can output the corresponding fingerprint identification detection signal, and other fingerprint identification units 20 cannot output the corresponding fingerprint identification detection signal. On the premise that the fingerprint identification units 20 can be detected, the embodiment of the present invention does not specifically limit whether the first control signals received by the first switch modules 30 are the same. Similarly, the second control signals received by the control terminals of the second switch modules 40 may be the same or different, and on the premise that the detection of the fingerprint identification units 20 can be realized, the embodiment of the present invention does not specifically limit whether the first control signals received by the second switch modules 40 are the same. For convenience of description, in the embodiments of the present invention, the technical solutions of the embodiments of the present invention are exemplarily described by taking as an example that the first control signal received by each first switch module is the same as the second control signal received by each second switch module.
It should be noted that fig. 1 is a schematic diagram illustrating an embodiment of the present invention, in fig. 1, each first switch module 30 may be electrically connected to two fingerprint identification units 20 or one fingerprint identification unit 20 in the same row, and each second switch module 40 is electrically connected to one fingerprint identification unit 20; in the embodiment of the present invention, each first switch module may be electrically connected to at least one fingerprint identification unit located in the same row, that is, each first switch module may be electrically connected to one fingerprint identification unit, two fingerprint identification units located in the same row, three fingerprint identification units located in the same row, or a plurality of fingerprint identification units located in the same row; accordingly, each second switch module may be electrically connected to one fingerprint recognition unit, two fingerprint recognition units located in the same column, or a plurality of fingerprint recognition units located in the same column. On the premise that detection of each fingerprint identification unit can be realized, the number of the fingerprint identification units electrically connected with the first switch module and the number of the fingerprint identification units electrically connected with the second switch module are not specifically limited in the embodiment of the invention.
Optionally, with continued reference to fig. 1, the input terminal of the fingerprint identification unit 20 is electrically connected to the detection power supply VDD; at this time, the fingerprint identification unit 20 can output different fingerprint identification detection signals according to the detection power supply VDD when the first switch module 30 is turned on. Thus, when different fingerprint identification detection signals are transmitted to the corresponding sub-pixels 10 through the turned-on second switch module 40, the sub-pixels 10 can present different display states according to the different fingerprint identification detection signals, so that the fingerprint identification capability of the fingerprint identification unit 20 can be detected.
Optionally, with continued reference to fig. 1, the first switching module 30 includes at least one first transistor; the first electrode of the first transistor is the input terminal of the first switch module 30, the second electrode of the first transistor is the output terminal of the first switch module, and the gate of the first transistor is the control terminal of the first switch module. Wherein each first switching module 30 may include only one first transistor; alternatively, when the fingerprint identification unit 20 includes a fingerprint identification element and a fingerprint identification driving circuit electrically connected to the fingerprint identification element, and the fingerprint identification driving circuit includes at least one second transistor, the number of the first transistors in each first switch module 30 may be the same as the number of the second transistors in each fingerprint identification driving circuit, and the gates of the second transistors of the fingerprint identification driving circuit are electrically connected to the second electrodes of the first transistors of each first switch module 30 in a one-to-one correspondence.
Accordingly, with continued reference to fig. 1, the second switch module 40 includes a third transistor. The first electrode of the third transistor is the input terminal of the second switch module 40, the second electrode of the third transistor is the output terminal of the second switch module 40, and the gate of the third transistor is the control terminal of the second switch module 40.
Exemplarily, fig. 3 is an equivalent circuit diagram of a fingerprint identification unit according to an embodiment of the present invention. As shown in fig. 3, the fingerprint recognition unit 20 may include a fingerprint recognition element 21 and a fingerprint recognition driving circuit 22, and the fingerprint recognition driving circuit 22 includes a driving transistor T, one second transistor M21, and a storage capacitor Cst. The first end of the fingerprint identification element 21 and the first end of the storage capacitor Cst receive the bias signal Vbias, the first end of the fingerprint identification element 21 and the first end of the storage capacitor Cst are electrically connected with the gate of the driving transistor T, the first electrode of the driving transistor T is electrically connected with the detection power supply VDD, and the second electrode of the driving transistor T is electrically connected with the first electrode of the second transistor M21; a gate of the second transistor M21 is electrically connected to the second electrode of the first transistor M11, and a second electrode of the second transistor M21 is electrically connected to the first electrode of the third transistor M3; the first electrode of the first transistor M11 is electrically connected to a first scan signal line, and when receiving a first scan signal Sn transmitted by the first scan signal line, the first transistor M11 can transmit the first scan signal Sn to the gate of the second transistor M21; the gate of the first transistor M11 receives a first control signal G1; the second electrode of the third transistor M3 is electrically connected to a data signal line, the gate of the third transistor M3 receives a second control signal, and when the fingerprint identification unit 20 outputs a fingerprint identification detection signal, the second transistor M3 can transmit the fingerprint identification detection signal to the data signal line and to the corresponding sub-pixel through the data signal line.
The effective first scanning signal transmitted by the first scanning signal line can control the on or off of the thin film transistor in the sub-pixel electrically connected with the first scanning signal line; meanwhile, when the first control signal G1 controls the first transistor M11 to be turned on, the first scan signal transmitted by the first scan signal line can be transmitted to the gate of the second transistor M21 through the turned-on first transistor M11 to control the turning on or off of the second transistor M21, and when the second transistor M21 is turned on, the fingerprint identification detection signal generated by the driving transistor T according to the detection power VDD can be output to the third transistor M3 through the turned-on second transistor M21; if the third transistor M3 is turned on, the third transistor M3 can transmit the fingerprint detection signal to the data signal line and from the data signal line to the corresponding sub-pixel, and when the thin film transistor of the sub-pixel is turned on, the display unit of the sub-pixel can receive the fingerprint detection signal, so as to display according to the fingerprint detection signal. Thus, the channel type of the thin film transistor in the sub-pixel may be the same as the channel type of the second transistor M21 in the fingerprint recognition unit 20. For example, when the thin film transistor in the sub-pixel is an N-type transistor, the second transistor M21 in the fingerprint identification unit 20 may also be an N-type transistor; alternatively, when the thin film transistor in the sub-pixel is a P-type transistor, the second transistor M21 in the fingerprint identification unit 20 may also be a P-type transistor.
For example, the thin film transistor in the sub-pixel and the second transistor M21 in the fingerprint identification unit 20 are both N-type transistors, and the first transistor M11 and the third transistor M2 are also N-type transistors. Fig. 4 is a timing diagram illustrating a detection process of a display panel according to an embodiment of the invention. As shown in fig. 1, 3 and 4, when detecting fingerprint identification, the high-level first control signal G1 controls the first transistor M11 to be turned on, and the high-level second control signal G2 controls the third transistor M3 to be turned on; while the first scan signal line 51 electrically connected to the sub-pixels 10 in the first row transmits the high-level first scan signal S1 to each sub-pixel 10 in the first row, the high-level first scan signal S1 transmitted by the first scan signal line 51 is also transmitted to the gate of the second transistor M21 of the fingerprint identification unit 20 in the first row through the first transistor M11 electrically connected to the first scan signal line 51, so that the second transistor M21 of the fingerprint identification unit 20 in the first row is turned on, and the second transistors M21 of the fingerprint identification units 20 in other rows are turned off; at this time, the driving transistor T in the first row of the fingerprint identification cells 20 can generate the corresponding fingerprint identification detection signal according to the detection power VDD, and the fingerprint identification detection signal can be transmitted to the third transistor M3 through the turned-on second transistor M21, and transmitted to the first row of the sub-pixels 10 through the turned-on third transistor M3 and the data signal line 52, so that the first row of the sub-pixels 10 can display, and the abnormal condition of each fingerprint identification cell 20 in the first row can be known from the display condition of each sub-pixel 10 in the first row.
Correspondingly, when the first scanning signal line 51 electrically connected to the sub-pixels 10 in the second row transmits the high-level first scanning signal S2 to the sub-pixels 10 in the second row, the high-level first scanning signal S2 transmitted by the first scanning signal line 51 is also transmitted to the gates of the second transistors M21 of the fingerprint identification units 20 in the second row through the first transistor M11 electrically connected to the first scanning signal line 51, so that the second transistors M21 of the fingerprint identification units 20 in the second row are turned on, and the second transistors M21 of the fingerprint identification units 20 in other rows are turned off; at this time, the driving transistor T in the fingerprint identification unit 20 in the second row can generate a corresponding fingerprint identification detection signal according to the detection power VDD, and the fingerprint identification detection signal can be transmitted to the third transistor M3 through the turned-on second transistor M21, and transmitted to the sub-pixels 10 in the second row through the turned-on third transistor M3 and the data signal line 52, so that the sub-pixels 10 in the second row can display, and the abnormal condition of each fingerprint identification unit 20 in the second row can be known according to the display condition of each sub-pixel 10 in the second row. By analogy, the abnormal condition of the fingerprint identification units 20 in the corresponding row can be known through the display condition of the sub-pixels 10 in the corresponding row, so that the individual detection of each fingerprint identification unit 20 in the display panel 100 can be realized.
It should be noted that fig. 4 of this embodiment is only a timing diagram when the thin film transistor in the sub-pixel and the second transistor M21 in the fingerprint identification unit 20 are both N-type transistors, and the first transistor M11 and the third transistor M2 are also N-type transistors, and the N-type transistors are generally turned on under the control of a high-level signal and turned off under the control of a low-level signal. In some alternative embodiments, the P-type transistor is turned on under the control of the low level signal and turned off under the control of the high level signal, so that the thin film transistor in the sub-pixel, the second transistor M21 in the fingerprint identification unit 20, the first transistor M11, and the third transistor M2 may also be P-type transistors, and the types of the transistors in the pixel driving circuit are not specifically limited in the embodiments of the present invention.
In addition, it should be noted that fig. 3 is only an exemplary diagram of an embodiment of the present invention, and the embodiment of the present invention does not specifically limit the specific structure of the fingerprint identification unit. Adopt the fingerprint identification unit to carry out fingerprint identification and can adopt first switch module and second switch module to carry out under the prerequisite that detects to the fingerprint identification unit, the fingerprint identification unit can design according to actual need.
Exemplarily, fig. 5 is an equivalent circuit diagram of another fingerprint identification unit provided in an embodiment of the present invention. Reference may be made to the above description of fig. 3 where fig. 5 is the same as fig. 3, and details are not repeated here, and only differences between fig. 5 and fig. 3 are exemplarily described here. As shown in fig. 5, the fingerprint recognition driving circuit 22 of each fingerprint recognition unit 20 includes two second transistors M21 and M22, and each corresponding first switching module 30 includes two first transistors M11 and M12; wherein a first electrode of the second transistor M22 is electrically connected to the sensing power source VDD, a second electrode of the second transistor M22 is electrically connected to the gate electrode of the driving transistor T, and a gate electrode of the second transistor M22 is electrically connected to the second electrode of the first transistor M12; the first electrode of the first transistor M12 and the first electrode of the first transistor M11 are both electrically connected to the same first scan signal line, and the gate of the first transistor M12 and the gate of the first transistor M11 both receive the same first control signal G1. When the first control signal G1 controls the first transistors M12 and M11 to be turned on, the first transistor M11 can transmit the first scan signal Sn transmitted by the first scan signal line to the second transistor M21, and the first transistor M12 can transmit the first scan signal Sn transmitted by the first scan signal line to the second transistor M22, so that the second transistors M21 and M22 are turned on or off under the control of the first scan signal Sn. In this case, the fingerprint recognition unit can also be configured to perform detection using the first switch module 30 and the second switch module 40.
Exemplarily, fig. 6 is an equivalent circuit diagram of another fingerprint identification unit provided by an embodiment of the present invention. Reference may be made to the above description of fig. 3 and 5 where fig. 6 is the same as fig. 3 and 5, and details are not repeated here, and only differences between fig. 6 and fig. 3 and 5 are exemplarily described here. As shown in fig. 6, the fingerprint recognition driving circuit 22 of each fingerprint recognition unit 20 includes three second transistors M21, M22 and M23, and each corresponding first switching module 30 includes three first transistors M11, M12 and M13; wherein the first electrode of the second transistor M23 is electrically connected to the fingerprint recognition element 21, the second electrode of the second transistor M23 is electrically connected to the gate of the driving transistor T, and the gate of the second transistor M23 is electrically connected to the second electrode of the first transistor M13; the first electrode of the first transistor M13, the first electrode of the first transistor M12 and the first electrode of the first transistor M11 are all electrically connected to the same first scan signal line, and the gate of the first transistor M13, the gate of the first transistor M12 and the gate of the first transistor M11 all receive the same first control signal G1. When the first control signal G1 controls the first transistors M13, M12 and M11 to be turned on, the first transistor M11 can transmit the first scan signal Sn transmitted by the first scan signal line to the second transistor M21, the first transistor M12 can transmit the first scan signal Sn transmitted by the first scan signal line to the second transistor M22, and the first transistor M13 can transmit the first scan signal Sn transmitted by the first scan signal line to the second transistor M23, so that the second transistors M21, M22 and M23 are turned on or off under the control of the first scan signal Sn. In this case, the fingerprint recognition unit can also be configured to perform detection using the first switch module 30 and the second switch module 40.
Optionally, fig. 7 is a schematic structural diagram of another display panel provided in an embodiment of the present invention. As shown in fig. 7, the display area 101 of the display panel 100 is further provided with a plurality of second scanning signal lines 53; the control ends of the fingerprint identification units 20 positioned in the same row are electrically connected with the same second scanning signal line 53; the output terminal of each first switch module 30 is electrically connected to the control terminals of the fingerprint identification units 20 located in the same row through the second scanning signal line 53.
Specifically, when the first control signal G1 controls the first switch module 30 to be turned on, the first switch module can transmit the first scan signal transmitted from the first scan signal line 51 electrically connected thereto to the second scan signal line 53, so that the second scanning signal line 53 can transmit the first scanning signal to the control terminal of the fingerprint identification unit 20 electrically connected thereto, control the corresponding fingerprint identification unit 20 to output the corresponding fingerprint identification detection signal, and the fingerprint identification detection signal can be transmitted to the corresponding data signal line 52 through the turned-on second switch module 40, so that the data signal lines 52 transmit the fingerprint identification detection signals to the corresponding sub-pixels 10 in a one-to-one correspondence, so that each sub-pixel 10 performs display according to the corresponding fingerprint identification detection signal, accordingly, it is possible to know the abnormality of the corresponding fingerprint recognition unit 20 from the display state of each sub-pixel 10. Meanwhile, the first switch module 30 is directly electrically connected to the fingerprint identification unit 20 in the same row through the corresponding second scanning signal line 53, and a signal line for detecting the fingerprint identification unit 20 is not required to be additionally arranged in the display area, so that the number of signal lines in the display area 101 of the display panel 100 can be reduced, the aperture opening ratio of the display panel 100 can be improved, the structure of the display panel 100 can be simplified, and the cost of the display panel 100 can be reduced. In addition, each of the first switch modules 30 may be disposed in the non-display area 102 of the display panel 100, which can also increase the aperture ratio of the display panel 100.
Optionally, as shown with continued reference to fig. 7, the display panel 100 further includes a non-display area 102 surrounding the display area 101; the non-display area 102 is provided with a first scan driving circuit 61 and a second scan driving circuit 62. Wherein, the output end of the first scanning driving circuit 61 is electrically connected with each first scanning signal line 51 in a one-to-one correspondence; the first scan driving circuit 61 is configured to output a first scan signal to each of the first scan signal lines 51; the output ends of the second scanning drive circuits 62 are electrically connected to the second scanning signal lines 53 in a one-to-one correspondence; the second scanning driving circuit 62 is configured to output a second scanning signal to each of the second scanning signal lines 53.
Specifically, the first scan driving circuit 61 may include a plurality of first shift register units, output ends of the first shift register units may be electrically connected to the first scan signal lines 51 in a one-to-one correspondence manner, and each of the first shift register units may sequentially output a corresponding first scan signal to each of the first scan signal lines 51, so that the data signal or the fingerprint identification detection signal transmitted by each of the data signal lines 52 may be correspondingly written into the corresponding sub-pixel 10. When the data signal transmitted by the data signal line 52 is written into the corresponding sub-pixel 10, the display panel 100 can display the corresponding picture, and when the fingerprint identification detection signal transmitted by the data signal line 52 is written into the corresponding sub-pixel 10, the fingerprint identification unit in the display panel 100 can be detected according to the display condition of each sub-pixel 10; meanwhile, each first scanning signal line is electrically connected with each second scanning signal line 53 in a one-to-one correspondence manner through each first switch module 30, so that the first scanning signals output by each first shift register unit can be transmitted to the control end of the corresponding fingerprint identification unit 20 through the first scanning signal lines, the first switch module 30 and the second scanning signal lines 53 in sequence, and the fingerprint identification unit 20 can output corresponding fingerprint identification detection signals. Thus, the first scan driving circuit 61 can be used as both the scan driving circuit 61 for displaying the corresponding picture on the display panel 100 and the scan driving circuit for detecting the fingerprint identification unit 20, so that it is not necessary to separately provide a corresponding scan driving circuit for detecting the fingerprint identification unit 20, which is beneficial to simplifying the structure of the display panel 100 and reducing the cost of the display panel 100; meanwhile, the occupied area of the non-display area 102 in the display panel 100 can be reduced, which is beneficial to the narrow frame of the display panel 100 and further improves the screen occupation ratio of the display panel 100.
Correspondingly, the non-display area 102 of the display panel 100 is further provided with a second scan driver 62, the second scan driver circuit 62 may include a plurality of second shift register units, an output end of each second shift register unit is electrically connected to each second scan signal line 53 in a one-to-one correspondence, each second shift register unit may sequentially output a corresponding second scan signal to each second scan signal line 53, so that each fingerprint identification unit 20 may output a corresponding fingerprint identification signal during fingerprint identification, and thus, a touch position of a finger and a fingerprint image of the finger may be determined according to the fingerprint identification signal output by each fingerprint identification unit 20, that is, the display panel may realize a fingerprint identification function.
Optionally, fig. 8 is a schematic structural diagram of another display panel provided in the embodiment of the present invention. As shown in fig. 8, the display area 101 of the display panel 100 is further provided with a plurality of fingerprint signal reading lines 54. Wherein, the input terminal of each second switch module 40 is electrically connected to the output terminal of the fingerprint identification unit 20 in the same column through the fingerprint signal reading line 54.
In this way, when the second control signal G2 controls the second switch module 40 to be turned on, the fingerprint identification detection signal output by the fingerprint identification unit 20 can be sequentially transmitted to the data signal line 52 through the corresponding fingerprint signal reading line 54 and the second switch module 40, so that the data signal line 52 can transmit the corresponding fingerprint identification detection signal to the corresponding sub-pixel 10, and the sub-pixel 10 can display the fingerprint identification detection signal, thereby knowing whether each fingerprint identification unit 20 is abnormal or not through the display condition of each sub-pixel 10. Meanwhile, the second switch module 40 is directly electrically connected to the fingerprint identification unit 20 in the same column through the corresponding fingerprint signal reading line 54, and a signal line for detecting the fingerprint identification unit 20 is not required to be additionally provided in the display area, so that the signal line in the display area 101 of the display panel 100 can be reduced, the aperture opening ratio of the display panel 100 can be improved, the structure of the display panel 100 can be simplified, and the cost of the display panel 100 can be reduced. In addition, each of the second switch modules 40 may also be disposed in the non-display area 102 of the display panel 100 to further increase the aperture ratio of the display panel 100.
Optionally, fig. 9 is a schematic structural diagram of another display panel provided in the embodiment of the present invention. As shown in fig. 9, the display panel 100 further includes a plurality of third switch modules 71, a plurality of clock control signal lines (551, 552, 553, 554), and a plurality of data pins 80; the second switching module 40 and the at least one third switching module 71 form a multiplexer circuit 701; the input end of each third switch module 71 and the output end of the second switch module 40 of the same multiplexer circuit 701 are electrically connected with the same data pin 81; the output end of each third switch module 71 is electrically connected with each data signal line 52 in a one-to-one correspondence manner; the control terminal of each third switch module 71 and the control terminal of the second switch module 40 of the same multiplexer circuit 71 are electrically connected to different clock signal lines (554, 553, 552, 551); wherein, different clock control signal lines (551, 552, 553, 554) transmit different clock control signals (G2, CKH1, CKH2, CKH 3); the clock control signal transmitted by the clock control signal line 551 electrically connected to the control end of the second switch module 40 is a second control signal G2; the clock control signals (CKH1, CKH2, CKH3) transmitted through the clock control signal lines (552, 553, 554) electrically connected to the control terminal of the third switching module 71 control the third switching module 71 to be turned on or off.
Illustratively, each multiplexer circuit 701 includes three third switch modules 71. When the fingerprint identification unit 20 is detected, one third switch module 71 and one second switch module 40 in the same multiplexer circuit 701 can be turned on; at this time, the fingerprint identification detection signal output by the fingerprint identification unit 20 can be transmitted to the second switch module 40 through the corresponding fingerprint signal reading line 54, and then transmitted to the data signal line 52 electrically connected to the turned-on third switch module 71 through the turned-on second switch module 40 and the turned-on third switch module 71 in sequence, and then transmitted to the corresponding sub-pixel through the data signal line 52, for example, the sub-pixel 1101(1102 or 1103), so that the sub-pixel 1101(1102 or 1103) can display according to the fingerprint identification detection signal, and thus whether the fingerprint identification unit 20 is abnormal or not can be determined according to the display condition of the sub-pixel 1101(1102 or 1103).
In addition, during the application of the display panel 100, the display panel 100 can be divided into a display stage and a fingerprint recognition stage. In the display stage, the third switch modules 71 in the same multiplexer circuit 701 can be respectively controlled to be turned on sequentially, the data pins 81 electrically connected with the third switch modules 71 of the same multiplexer circuit 701 receive corresponding data signals, and the data signals can be transmitted to corresponding sub-pixels 1101(1102 or 1103) through the turned-on third switch modules 71 and data signal lines, so that the sub-pixels 1101(1102 or 1103) can display according to the data signals; in the fingerprint identification stage, each third switch module 71 is turned off, the second switch module 40 is turned on, and the fingerprint identification signal output by the fingerprint identification unit 20 can be transmitted to the corresponding data pin through the turned-on third switch module 71, so that a driving chip (not shown in the figure) electrically connected to the data pin of the display panel 100 can obtain a fingerprint image according to the fingerprint identification signal and match the fingerprint image prestored therein, thereby performing a corresponding fingerprint identification function, such as unlocking, payment, etc., when the obtained fingerprint image is successfully matched with the fingerprint image prestored therein.
Thus, when the second switch module 40 and the at least one third switch module 71 form a multiplexer circuit, on the premise of detecting the fingerprint identification unit 20, the number of data pins in the display panel 100 can be reduced, which is beneficial to simplifying the structure of the display panel 100, and accordingly, the number of pins of the driving chip electrically connected to the data pins of the display panel 100 can be reduced, so that the structure of the driving chip can be simplified, and the cost of the driving chip can be reduced.
It should be noted that fig. 9 is only an exemplary diagram of the embodiment of the present invention, and each of the multiplexer circuits 701 shown in fig. 9 includes three third switch modules 71; however, in the embodiment of the present invention, each multiplexer circuit may include at least one third switching module, that is, each multiplexer circuit may include one third switching module, two third switching modules, or multiple third switching modules, which is not limited in this embodiment of the present invention.
Alternatively, with continued reference to fig. 9, when each multiplexer circuit 701 includes three third switch modules 701, the three third switch modules 71 of the same multiplexer circuit 701 are electrically connected to the subpixels (1101, 1102, 1103) displaying different colors through the respective data signal lines 52, respectively. The display colors of the sub-pixels 1101, 1102 and 1103 can be red, blue and green respectively by electrically connecting the corresponding data signal lines 52 with the same multiplexer circuit 701, and the adjacent sub-pixels 1101, 1102 and 1103 in the same row can form a pixel unit, so that the display panel can present a colorful picture.
Optionally, fig. 10 is a schematic structural diagram of another display panel provided in the embodiment of the present invention. As shown in fig. 10, the display panel 100 further includes at least one data detection signal line (561, 562) and at least one fourth switching module 72; an input terminal of the fourth switching module 72 is electrically connected to the data detection signal lines (561, 562); the output terminal of each fourth switching module 72 is electrically connected to at least one data signal line 52; the control terminal of the fourth switching module 72 receives the fourth control signal G4 and is turned on or off under the control of the fourth control signal G4. In this way, when the fourth control signal G4 controls the fourth switch module 72 to be turned on, the data detection signal line (561, 562) transmits the data detection signal to the corresponding sub-pixel 1101(1102 or 1103) through the turned-on fourth switch module 72 and the data signal line 52, so that the sub-pixel 1101(1102 or 1103) can display according to the data detection signal, and the abnormality of each sub-pixel (1101, 1102, 1103) in the display panel 100 is determined according to the display condition of each sub-pixel (1101, 1102, 1103), thereby detecting each sub-pixel in the display panel 100.
Illustratively, when the multiplexer circuits 701 are disposed in the display panel 100, and the third switch modules in each multiplexer circuit 701 are electrically connected to the sub-pixels (1101, 1102, 1103) of different display colors, and the adjacent sub-pixels 1101, 1102, and 1103 in the same row are a pixel unit, the display panel 100 may include two data detection signal lines 561 and 562. Here, the sub-pixels (1101, 1102, 1103) in the pixel unit of the odd-numbered column can be electrically connected to the data detection signal line 561 through the multiplexer circuit 701, and the sub-pixels (1101, 1102, 1103) in the pixel unit of the even-numbered column can be electrically connected to the data detection signal line 562 through the multiplexer circuit 701. In this case, the data detection signals transmitted by the data detection signal line 561 and the data detection signal line 562 may be the same or different, and when the data detection signals transmitted by the data detection signal line 561 and the data detection signal line 562 are different, different display frames of the display panel 100 can be detected, so that the detection accuracy of the display panel 100 can be improved.
The embodiment of the present invention further provides a method for detecting a display panel, where the detection aspect of the display panel can be applied to the display panel provided in the embodiment of the present invention, and therefore, the method for detecting a display panel also has the beneficial effects of the display panel provided in the embodiment of the present invention, and reference may be made to the above description of the display panel provided in the embodiment of the present invention for the same points.
Illustratively, the detection method of the display panel can comprise a first stage and a second stage. Fig. 11 is a flowchart of a method for detecting a display panel according to an embodiment of the present invention. As shown in fig. 11, the method for detecting a display panel includes:
s110, in the first stage, a first control signal controls a first switch module to be conducted, a first scanning signal line transmits a first scanning signal to a sub-pixel and transmits the first scanning signal to a fingerprint identification unit through the conducted first switch module, and the fingerprint identification unit is controlled to output a fingerprint identification detection signal; the second control signal controls the second switch module to be conducted, and the fingerprint identification detection signal is transmitted to the sub-pixel through the second switch module and the data signal line in sequence, so that the sub-pixel displays according to the fingerprint identification detection signal;
and S120, in the second stage, determining the detection result of the fingerprint identification unit according to the display state of the sub-pixels.
Specifically, when the first control signal controls the conduction of the corresponding first switch module, and the second control signal controls the conduction of the corresponding second switch module, and the first scanning signal line transmits an effective first scanning signal to the sub-pixels of the corresponding row, the effective first scanning signal is also transmitted to the fingerprint identification unit electrically connected with the first switch module through the conducted first switch module, so that the fingerprint identification unit can output a corresponding fingerprint identification detection signal when receiving the effective first scanning signal, the fingerprint identification detection signal can be transmitted to the corresponding sub-pixels through the conducted second switch module and the data signal line in sequence, so that the corresponding sub-pixels can be displayed according to the fingerprint identification detection signal, and whether the fingerprint identification unit corresponding to the sub-pixels is abnormal or not can be judged according to the display light-emitting condition of the corresponding sub-pixels, thereby, the detection result of each fingerprint identification unit in the display panel can be obtained.
Optionally, when the display panel further includes at least one data detection signal line and at least one fourth switch module, and an input end of the fourth switch module is electrically connected to the data detection signal line, an output end of each fourth switch module is electrically connected to the at least one data signal line, and a control end of the fourth switch module receives a fourth control signal, the detection method of the display panel may further include a third stage and a fourth stage, where the third stage and the fourth stage may be located before the first stage and the second stage, or after the first stage and the second stage, which is not specifically limited in this embodiment of the present invention. For example, taking the third stage and the fourth stage that can be located before the first stage and the second stage as an example, fig. 12 is a flowchart of a method for detecting a display panel according to another embodiment of the present invention. As shown in fig. 12, the method for detecting a display panel includes:
s210, in the third stage, a first control signal controls a first switch module to be closed and a second control signal controls a second switch module to be closed, a fourth control signal controls a fourth switch module to be conducted, a first scanning signal line transmits a first scanning signal to a sub-pixel, and a data detection signal transmitted by a data detection signal line is written into the sub-pixel through the fourth switch module and the data signal line in sequence so that the sub-pixel displays according to the data detection signal;
s220, in the fourth stage, determining the detection result of each sub-pixel according to the display state of the sub-pixels;
s230, in the first stage, the first control signal controls the first switch module to be conducted, the first scanning signal line transmits a first scanning signal to the sub-pixel and transmits the first scanning signal to the fingerprint identification unit through the conducted first switch module, and the fingerprint identification unit is controlled to output a fingerprint identification detection signal; the second control signal controls the second switch module to be conducted, and the fingerprint identification detection signal is transmitted to the sub-pixel through the second switch module and the data signal line in sequence, so that the sub-pixel displays according to the fingerprint identification detection signal;
s240, in the second stage, according to the display state of the sub-pixels, the detection result of the fingerprint identification unit is determined.
Specifically, when the display panel is detected, each fourth switch module can be controlled to be turned on, and each first switch module and each second switch module are turned off, so that the data detection signal transmitted by the data detection signal line can be written into the corresponding sub-pixel, and when the sub-pixel receives the data detection signal, the sub-pixel can display according to the data detection signal, and whether the sub-pixel is abnormal or not can be known through the display state of the sub-pixel, so that the detection result of the sub-pixel can be determined. After the sub-pixel detection in the display panel is finished, the fingerprint identification unit in the display panel can be detected, and at the moment, the fingerprint identification unit can be electrically connected with the sub-pixel in the normal display state through the second switch module, so that the detection result of the fingerprint identification unit can be determined according to the display state of the sub-pixel, and the detection accuracy of the fingerprint identification unit is favorably improved.
Embodiments of the present invention further provide a display device, where the display device includes the display panel provided in the embodiments of the present invention, and therefore the display device also has the beneficial effects of the display panel provided in the embodiments of the present invention, and the same points can be understood with reference to the above description, and are not described in detail below.
For example, fig. 13 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 13, the display device 200 includes the display panel 100 according to the embodiment of the present invention, and the display device 200 may be a mobile phone, a tablet computer, a smart wearable device (e.g., a smart watch), or other display devices with fingerprint identification function known to those skilled in the art, which is not limited in the embodiment of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (14)

1. A display panel, comprising: a display area; the display area is provided with a plurality of sub-pixels arranged in an array, a plurality of data signal lines, a plurality of first scanning signal lines and a plurality of fingerprint identification units; the fingerprint identification unit is positioned at the gap between the sub-pixels; the sub-pixels positioned on the same row are electrically connected with the same first scanning signal line; the sub-pixels positioned in the same column are electrically connected with the same data signal line;
the display panel further comprises a plurality of first switch modules and a plurality of second switch modules;
the input end of the first switch module is electrically connected with one first scanning signal line; the output end of each first switch module is electrically connected with the control end of at least one fingerprint identification unit, and the fingerprint identification units electrically connected with the same first switch module are positioned in the same row; the control end of each first switch module receives a first control signal and is switched on or off under the control of the first control signal;
the input end of each second switch module is electrically connected with the output end of at least one fingerprint identification unit, and the fingerprint identification units electrically connected with the same second switch module are positioned in the same column; the output end of the second switch module is electrically connected with one data signal line; and the control end of the second switch module receives a second control signal and is switched on or off under the control of the second control signal.
2. The display panel of claim 1, wherein the first switch module comprises at least one first transistor; the first electrode of the first transistor is the input end of the first switch module, the second electrode of the first transistor is the output end of the first switch module, and the grid electrode of the first transistor is the control end of the first switch module.
3. The display panel according to claim 2, wherein the fingerprint identification unit includes a fingerprint identification element and a fingerprint identification driving circuit electrically connected to the fingerprint identification element;
the fingerprint identification driving circuit comprises at least one second transistor; and the grid electrode of each second transistor is electrically connected with the second electrode of each first transistor in a one-to-one correspondence manner.
4. The display panel according to claim 1, wherein the second switch module includes a third transistor; the first electrode of the third transistor is the input end of the second switch module, the second electrode of the third transistor is the output end of the second switch module, and the gate of the third transistor is the control end of the second switch module.
5. The display panel according to claim 1, wherein the display region is further provided with a plurality of second scanning signal lines; the control ends of the fingerprint identification units positioned on the same row are electrically connected with the same second scanning signal line;
the output end of each first switch module is electrically connected with the control end of the fingerprint identification unit in the same row through the second scanning signal line.
6. The display panel according to claim 5, further comprising: a non-display area surrounding the display area; the non-display area is provided with a first scanning driving circuit and a second scanning driving circuit;
the output end of the first scanning driving circuit is electrically connected with each first scanning signal line in a one-to-one correspondence manner; the first scanning driving circuit is used for outputting a first scanning signal to each first scanning signal line;
the output end of the second scanning drive circuit is electrically connected with each second scanning signal line in a one-to-one correspondence manner; the second scanning driving circuit is used for outputting a second scanning signal to each second scanning signal line.
7. The display panel according to claim 1, wherein the display area is further provided with a plurality of fingerprint signal reading lines;
the input end of each second switch module is electrically connected with the output end of the fingerprint identification unit positioned in the same column through the fingerprint signal reading line.
8. The display panel according to claim 7, further comprising: the plurality of third switch modules, the plurality of clock control signal lines and the plurality of data pins; the second switch module and at least one third switch module form a multiplexer circuit;
the input end of each third switch module and the output end of each second switch module of the same multiplexer circuit are electrically connected with the same data pin; the output end of each third switch module is electrically connected with each data signal line in a one-to-one correspondence manner; the control ends of the third switch modules and the control ends of the second switch modules of the same multiplexer circuit are electrically connected with different clock signal lines;
wherein, different clock control signal lines transmit different clock control signals; the clock control signal transmitted by the clock control signal line electrically connected with the control end of the second switch module is a second control signal; and the clock control signal transmitted by the clock control signal line electrically connected with the control end of the third switch module controls the third switch module to be switched on or switched off.
9. The display panel according to claim 8, wherein each of the multiplexer circuits includes three of the third switch modules; and the three third switch modules of the same multiplexer circuit are respectively and electrically connected with the sub-pixels displaying different colors through the data signal lines.
10. The display panel according to claim 1, further comprising: at least one data detection signal line and at least one fourth switch module;
the input end of the fourth switch module is electrically connected with the data detection signal wire; the output end of each fourth switch module is electrically connected with at least one data signal line; and the control end of the fourth switch module receives a fourth control signal and is switched on or off under the control of the fourth control signal.
11. The display panel according to claim 1, wherein an input terminal of the fingerprint identification unit is electrically connected to a detection power supply; the fingerprint identification unit is used for outputting different fingerprint identification detection signals according to the detection power supply when the first switch module is switched on.
12. A method for inspecting a display panel, which is applied to the display panel according to any one of claims 1 to 11, the method comprising at least: a first stage and a second stage;
in the first stage, the first control signal controls the first switch module to be switched on, the first scanning signal line transmits a first scanning signal to the sub-pixel and transmits the first scanning signal to the fingerprint identification unit through the switched-on first switch module, and the fingerprint identification unit is controlled to output a fingerprint identification detection signal; the second control signal controls the second switch module to be conducted, and the fingerprint identification detection signal is transmitted to the sub-pixel through the second switch module and the data signal line in sequence, so that the sub-pixel displays according to the fingerprint identification detection signal;
and in the second stage, determining the detection result of the fingerprint identification unit according to the display state of the sub-pixels.
13. The method of claim 12, wherein the display panel further comprises at least one data detection signal line and at least one fourth switch module; the input end of the fourth switch module is electrically connected with the data detection signal wire; the output end of each fourth switch module is electrically connected with at least one data signal line; the control end of the fourth switch module receives a fourth control signal;
the detection method further comprises a third stage and a fourth stage;
in the third stage, the first control signal controls the first switch module to be turned off and the second control signal controls the second switch module to be turned off, the fourth control signal controls the fourth switch module to be turned on, the first scanning signal line transmits a first scanning signal to the sub-pixel, and a data detection signal transmitted by the data detection signal line is written into the sub-pixel through the fourth switch module and the data signal line in sequence, so that the sub-pixel displays according to the data detection signal;
and in the fourth stage, determining the detection result of each sub-pixel according to the display state of the sub-pixel.
14. A display device comprising the display panel according to any one of claims 1 to 11.
CN202010753145.4A 2020-07-30 2020-07-30 Display panel, detection method thereof and display device Active CN111881847B (en)

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