CN112768493B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN112768493B CN112768493B CN202011588683.9A CN202011588683A CN112768493B CN 112768493 B CN112768493 B CN 112768493B CN 202011588683 A CN202011588683 A CN 202011588683A CN 112768493 B CN112768493 B CN 112768493B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/131—Interconnections, e.g. wiring lines or terminals
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Abstract
The invention discloses a display panel and a display device, which relate to the technical field of display and comprise: a display area and a non-display area at least partially surrounding the display area; the display area comprises a fingerprint identification area, the fingerprint identification area comprises a plurality of sub-areas which are arranged in an array, and each sub-area comprises at least one fingerprint identification circuit; the fingerprint identification circuit comprises at least one fingerprint identification sensor, a plurality of signal lines and a plurality of circuit elements; each sub-area is provided with a central area and a peripheral area, at least part of the fingerprint identification sensors are positioned in the central area, and at least part of the circuit elements and at least part of the signal lines are positioned in the peripheral area. This application sets up in peripheral region, fingerprint identification sensor through concentrating the signal line with among the fingerprint identification circuit and concentrates and set up in central zone, can make each fingerprint identification sensor's effective area maximize, and then improves fingerprint identification sensor's the light inlet quantity and fingerprint identification's precision, has also reduced display panel's short circuit risk simultaneously.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
Organic Light-Emitting Diode (OLED) display panels have characteristics of self-luminescence, high contrast, lightness, thinness, and power saving, and thus are widely used in various intelligent terminal devices.
In recent years, with the rise of full-screen technology, it has become a trend to integrate fingerprint recognition in the display area of a display device. Generally, the fingerprint identification area includes a fingerprint identification circuit including a fingerprint identification sensor and a plurality of signal lines electrically connected to the fingerprint identification sensor. For the display device applying the optical fingerprint identification technology, when fingerprint identification is carried out, light rays emitted by the fingerprint identification light source enter the fingerprint identification sensor after being reflected by fingers, and the fingerprint identification sensor can realize fingerprint identification according to different intensities of the reflected light rays at fingerprint valley and ridge positions.
However, the number of signal lines in the fingerprint identification circuit is large, and the signal lines occupy the area of the display area, so that the effective area of the fingerprint identification sensor is compressed, the light quantity received by the fingerprint identification sensor is reduced, and the accuracy of fingerprint identification is affected.
Disclosure of Invention
The invention provides a display panel and a display device, which can increase the light quantity received by a fingerprint identification sensor, thereby improving the accuracy of fingerprint identification.
In a first aspect, the present application provides a display panel comprising: a display area and a non-display area at least partially surrounding the display area;
the display area comprises a fingerprint identification area, the fingerprint identification area comprises a plurality of sub-areas which are arranged in an array, and each sub-area comprises at least one fingerprint identification circuit; the fingerprint identification circuit comprises at least one fingerprint identification sensor, a plurality of signal lines and a plurality of circuit elements;
each sub-area is provided with a central area and a peripheral area, at least part of the fingerprint sensor is located in the central area, and the circuit elements and at least part of the signal lines are located in the peripheral area.
In a second aspect, the present application further provides a display device including the display panel provided in the present application.
Compared with the prior art, the display panel and the display device provided by the invention at least realize the following beneficial effects:
the application provides a display panel and display device, including display area and non-display area, the display area includes the fingerprint identification district, and this fingerprint identification district is divided into a plurality of sub-regions that are the array and arrange, and each sub-region includes at least one fingerprint identification circuit, and every fingerprint identification circuit includes at least one fingerprint identification sensor, many signal lines and a plurality of circuit component. Among the correlation technique, the signal line interlude of fingerprint identification circuit sets up between the fingerprint identification sensor, and leave certain space of dodging between signal line and each fingerprint identification sensor, more display area can be taken up to this kind of design, this application is through dividing the subregion into central zone and peripheral area, and concentrate the signal line in the fingerprint identification circuit and set up in peripheral area, the fingerprint identification sensor sets up in central zone, can make the effective area maximize of each fingerprint identification sensor, and then improve the light inlet quantity of fingerprint identification sensor and fingerprint identification's precision, display panel's short circuit risk has also been reduced simultaneously.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a sub-area provided in the embodiment of FIG. 1;
FIG. 3 is another schematic diagram of a sub-region provided in the embodiment of FIG. 1;
FIG. 4 is a schematic view of another structure of the sub-region provided in the embodiment of FIG. 1;
FIG. 5 is a schematic view of another structure of the sub-region provided in the embodiment of FIG. 1;
FIG. 6 is a partial schematic view of the display panel provided in the embodiment of FIG. 1;
FIG. 7 is a partial schematic view of the display panel shown in the embodiment of FIG. 1;
FIG. 8 is an equivalent circuit diagram of a fingerprint identification circuit provided in an embodiment of the present application;
fig. 9 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;
fig. 10 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;
FIG. 11 is a cross-sectional view CC' of the sub-regions provided in the embodiment of FIG. 5;
FIG. 12 is a cross-sectional view of a CC' of the sub-region provided in the embodiments of the present application;
FIG. 13 is a schematic view of another structure of the sub-region provided in the embodiment of FIG. 1;
FIG. 14 is another equivalent circuit diagram of a fingerprint identification circuit provided in an embodiment of the present application;
fig. 15 is a schematic structural diagram of a display device according to an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is a schematic structural diagram of a display panel provided in an embodiment of the present application, and fig. 2 is a schematic structural diagram of a sub-region provided in the embodiment of fig. 1. Referring to fig. 1 and fig. 2, the present application provides a display panel 100, including: a display area AA and a non-display area NA at least partially surrounding the display area AA;
the display area AA includes a fingerprint identification area Z, the fingerprint identification area Z includes a plurality of sub-areas BA arranged in an array, and each sub-area BA includes at least one fingerprint identification circuit 10; the fingerprint identification circuit 10 comprises at least one fingerprint identification sensor 101, a plurality of signal lines 102 and a plurality of circuit elements 103;
each sub-area BA is provided with a central area 20 and a peripheral area 30, at least part of the fingerprint recognition sensor 101 being located in the central area 20, and at least part of the circuit elements 103 and at least part of the signal lines 102 being located in the peripheral area 30.
Specifically, the display panel 100 provided by the present application includes a display area AA and a non-display area NA, the display area AA may be divided into a fingerprint identification area Z and a non-fingerprint identification area FZ, and all areas except the fingerprint identification area Z in the display area AA are the non-fingerprint identification area FZ. Optionally, the fingerprint identification area Z includes a plurality of sub-areas BA arranged in an array, each sub-area BA includes at least one fingerprint identification circuit 10, wherein the fingerprint identification circuit 10 is composed of at least one fingerprint identification sensor 101, a plurality of signal lines 102 and a plurality of circuit elements 103. At fingerprint identification's in-process, the user can place the finger in fingerprint identification district Z, and the light that the fingerprint identification light source sent is received by fingerprint identification sensor 101 after the finger reflection, and fingerprint identification sensor 101 produces different current signal according to fingerprint valley, the different intensity of ridge position reflection light, and then realizes fingerprint identification by driver chip according to current signal.
It can be understood that, in order to ensure the fingerprint identification accuracy of the display panel 100, a large number of fingerprint identification circuits 10 are usually disposed in the fingerprint identification area Z, each fingerprint identification circuit 10 includes a plurality of signal lines 102, and when the signal lines 102 in the fingerprint identification circuit 10 are designed, if the signal lines 102 are inserted between the fingerprint identification sensors 101, a certain avoiding space must be left between the fingerprint identification sensors 101 and the signal lines 102, otherwise, there is a risk of short circuit. However, the signal lines 102 of the fingerprint identification circuit 10 in the display panel 100 are numerous, and the layout in the above-mentioned design method greatly occupies the area Z of the fingerprint identification area, and further, when the area Z of the fingerprint identification area is constant, the effective area of each fingerprint identification sensor 101 is compressed, the amount of light entering the finger reflected light is reduced, and the accuracy of fingerprint identification is adversely affected.
In order to solve the above problem, as shown in fig. 2, the present application provides a central area 20 and a peripheral area 30 in the sub-area BA, and at least a part of the fingerprint recognition sensor 101 is located in the central area 20, and at least a part of the circuit element 103 and at least a part of the signal line 102 are located in the peripheral area 30; that is, in the present application, the circuit elements 103 and at least some of the signal lines 102 of the fingerprint identification circuit 10 in each sub-area BA are collectively disposed in the peripheral area 30, and the fingerprint identification sensors 101 are collectively disposed in the central area 20, so that the signal lines 102 do not need to be disposed between the fingerprint identification sensors 101, the occupation of the fingerprint identification area Z is reduced, and the saved space can be used to increase the effective area of the fingerprint sensors. The larger the effective area of the fingerprint identification sensor 101 is, the more the finger reflection light can be received by the fingerprint identification sensor 101, and the finger reflection light contains fingerprint identification information, so that the accuracy of fingerprint identification can be directly influenced by the light incoming amount of the fingerprint identification sensor 101, and the effective area of the fingerprint identification sensor 101 is increased by compressing the occupied space of the signal line 102 in the design mode, so that the accuracy of fingerprint identification can be improved, and the short circuit risk of the display panel 100 is effectively reduced.
It should be noted that fig. 2 is only used for illustrating a positional relationship of the fingerprint identification area Z in the display area AA, in some other embodiments of the present application, the fingerprint identification area Z may also be located at any other position of the display area AA, and the size of the fingerprint identification area Z is not limited in the drawing, and in some other embodiments of the present application, the fingerprint identification area Z may also coincide with the display area AA.
Fig. 3 and 4 are schematic views illustrating another structure of the sub-region provided in the embodiment of fig. 1. Referring to fig. 3 and fig. 4, in the present embodiment, the peripheral region 30 includes a first sub-region 301 and a second sub-region 302, wherein the first sub-region 301 extends along a first direction x, the second sub-region 302 extends along a second direction y, and the first direction x intersects with the second direction y;
at least part of the signal lines 102 is located in the first sub-area 301 and at least part of the signal lines 102 is located in the second sub-area 302.
In the course of research, the inventors found that the routing in the display panel 100 is usually designed to be consistent with the extending direction of the gate lines, or consistent with the extending direction of the data lines, so that in this embodiment, the peripheral area 30 can be divided into a first sub-area 301 extending along a first direction x and a second sub-area 302 extending along a second direction y, so as to arrange at least part of the signal lines 102 in the fingerprint identification circuit 10 in the first sub-area 301, and arrange at least part of the signal lines 102 in the second sub-area 302, where the first direction x is the extending direction of the gate lines and the second direction y is the extending direction of the data lines.
On one hand, the design mode can compress the occupied space of the signal line 102 and increase the effective area of the fingerprint identification sensor 101, so that the fingerprint identification precision is improved and the short circuit risk is reduced; on the other hand, in the view angles as shown in fig. 3 and 4, the first sub-area 301 and the second sub-area 302 are designed to extend along the horizontal direction and the vertical direction, respectively, so that the routing difficulty of the signal lines 102 in the fingerprint identification circuit 10 can be reduced, and the reliability of the display panel 100 can be improved.
In this embodiment, the first sub-zone 301 and the second sub-zone 302 are arranged as shown in fig. 3: the first sub-zone 301 intersects the sub-zone BA in the first direction x, the second sub-zone 302 being perpendicular to the first sub-zone 301; alternatively, the design shown in fig. 4 may be adopted, in which the second sub-area 302 intersects the sub-area BA in the second direction y, and the first sub-area 301 is perpendicular to the second sub-area 302. Furthermore, in some other embodiments of the present application, the first sub-area 301 and the second sub-area 302 may also be designed to extend in any other direction, which is not limited in the present application.
Fig. 5 is another schematic structural diagram of the sub-region provided in the embodiment of fig. 1. As shown in fig. 5, the first sub-region 301 includes a device region 303, the device region 303 being adjacent to the second sub-region 302; alternatively, the second sub-region 302 comprises a device region 303, the device region 303 being adjacent to the first sub-region 301; at least a portion of circuit element 103 is located in device region 303.
In this embodiment, the peripheral region 30 of each sub-region BA further includes a device region 303 for disposing at least a portion of the circuit elements 103 in the fingerprint identification circuit 10. Optionally, the device region 303 is located in the first sub-region 301 and adjacent to the second sub-region 302, or the device region 303 is located in the second sub-region 302 and adjacent to the first sub-region 301. Since the signal lines 102 in the fingerprint identification circuit 10 need to be electrically connected to the respective circuit elements 103, the present application can balance the distance between the device region 303 and the first sub-region 301 and the distance between the device region 303 and the second sub-region 302 by disposing the device region 303 between the first sub-region 301 and the second sub-region 302, so that the length of the signal lines 102 can be minimized when the signal lines 102 located in the first sub-region 301 or the signal lines 102 located in the second sub-region 302 are connected to the circuit elements 103, thereby facilitating the simplification of the manufacturing process and saving the manufacturing cost of the display panel 100.
In addition, the present application arranges the device region 303 in the first sub-region 301 or the second sub-region 302, and arranges at least a part of the circuit elements 103 in the device region 303, so as to avoid the circuit elements 103 in the fingerprint identification circuit 10 occupying the area of the central region 20, thereby further increasing the effective area of each fingerprint identification sensor 101.
Fig. 6 is a partial schematic view of the display panel provided in the embodiment of fig. 1. Optionally, referring to fig. 6, in the same row of sub-areas BA, the first sub-areas 301 are communicated to form a first area A1 extending along the first direction x, and the fingerprint identification circuits 10 in the sub-areas BA share the signal line 102 in the first area A1.
Referring to fig. 1, fig. 2 and fig. 6, in the present embodiment, the plurality of sub-regions BA are arranged in an array along the first direction x and the second direction y, and the first sub-regions 301 in each sub-region BA have the same extending direction, so that the plurality of first sub-regions 301 in each row of sub-regions BA are communicated to form the first region A1 extending along the first direction x, and the fingerprint identification circuits 10 in each sub-region BA share the signal lines 102 in the first region A1, such a design manner can reduce the number of the signal lines 102 in the fingerprint identification region Z, further reduce the area occupied by the first sub-regions 301 in the sub-regions BA, and is equivalent to increase the area of the central region 20 under the condition that the area of the sub-regions BA is constant, thereby being beneficial to increase the effective area of the fingerprint identification sensor 101 and improving the accuracy of fingerprint identification.
Fig. 7 is a partial schematic view of the display panel provided in the embodiment of fig. 1. Alternatively, as shown in fig. 7, in the same column of sub-areas BA, the second sub-areas 302 are communicated to form a second area A2 extending along the second direction y, and the fingerprint identification circuits 10 in the sub-areas BA share the signal lines 102 in the second area A2.
Specifically, referring to fig. 1 and 7, the second sub-areas 302 in each sub-area BA in the fingerprint identification area Z have the same extending direction, so that the present application connects the plurality of first sub-areas 301 in each row of sub-areas BA to form the second area A2 extending along the second direction y, and the fingerprint identification circuits 10 in each sub-area BA share the signal lines 102 in the second area A2, such design can further reduce the number of the signal lines 102 in the fingerprint identification area Z, further reduce the area occupied by the second sub-areas 302 in the sub-areas BA, and increase the effective area of the fingerprint identification sensor 101 to increase the light entering amount thereof, thereby improving the accuracy of fingerprint identification.
Fig. 8 is an equivalent circuit diagram of a fingerprint identification circuit according to an embodiment of the present application. As shown in fig. 8, the plurality of signal lines 102 includes at least one of a reset signal line RST, a selection signal line SEL, a reference voltage signal line Vbias, a power supply line VDD, and an output signal line Vout, and the circuit element 103 includes at least one of a first capacitor C1, a first thin film transistor T1, a second thin film transistor T2, and a third thin film transistor T3;
the reference voltage signal line Vbias is electrically connected to a first end of the first capacitor C1, the gate of the first thin film transistor T1 is electrically connected to the reset signal line RST, the first pole of the first thin film transistor T1 is electrically connected to the cathode of the fingerprint recognition sensor 101, the second end of the first capacitor C1, and the gate of the second thin film transistor T2, the second pole of the first thin film transistor T1 is electrically connected to the power line VDD and the first pole of the second thin film transistor T2, the second pole of the second thin film transistor T2 is electrically connected to the first pole of the third thin film transistor T3, the gate of the third thin film transistor T3 is electrically connected to the selection signal line SEL, and the second pole of the third thin film transistor T3 is electrically connected to the output signal line Vout.
It should be understood that the light-sensing fingerprint identification technology mainly identifies fingerprints by detecting the intensity difference of the reflected light of the fingerprint ridges and valleys, so the fingerprint identification sensor 101 may selectively use an infrared photodiode; further, the plurality of signal lines 102 in the fingerprint recognition circuit 10 may include a reset signal line RST, a selection signal line SEL, a reference voltage signal line Vbias, a power supply line VDD, and an output signal line Vout, and the circuit element 103 may include a first capacitor C1, a first thin film transistor T1, a second thin film transistor T2, and a third thin film transistor T3. Specifically, as shown in the figure, the reference voltage signal line Vbias is electrically connected to a first end of the first capacitor C1, a gate of the first thin film transistor T1 is electrically connected to the reset signal line RST, a first pole of the first thin film transistor T1 is electrically connected to a cathode of the fingerprint recognition sensor 101, a second end of the first capacitor C1, and a gate of the second thin film transistor T2, a second pole of the first thin film transistor T1 is electrically connected to the power supply line VDD and a first pole of the second thin film transistor T2, a second pole of the second thin film transistor T2 is electrically connected to a first pole of the third thin film transistor T3, a gate of the third thin film transistor T3 is electrically connected to the selection signal line SEL, and a second pole of the third thin film transistor T3 is electrically connected to the output signal line Vout.
In this embodiment, the working process of the display panel 100 includes a display stage and a fingerprint identification stage, and the display stage and the fingerprint identification stage are performed in a time-sharing manner; further, the fingerprint identification phase comprises a reset phase, a light receiving phase and a data reading phase. In a reset phase, the first thin film transistor T1 is turned on, the voltage of the Vpixel node is reset to the power supply voltage, and the first capacitor C1 is charged under the action of the bias voltage provided by the reference voltage signal line Vbias and the power supply voltage provided by the power supply line VDD; in the light receiving stage, the first reset transistor is turned off, the finger reflection light is incident to the fingerprint identification sensor 101 and forms a current signal, so that the cathode potential of the fingerprint identification sensor 101 changes, namely the potential of the Vpixel node changes; in the data reading stage, the third thin film transistor T3 is turned on, and the driving chip reads the potential variation of the Vpixel node, thereby determining the magnitude of the current signal, and performing fingerprint identification according to the magnitude of the current signal. It can be seen that the fingerprint identification circuit 10 used in this embodiment has a simple structure, and does not increase the difficulty of wiring, thereby reducing the difficulty of manufacturing the display panel 100.
Of course, fig. 8 is only used for schematically illustrating the principle and structure of the fingerprint identification circuit 10, and in some other embodiments of the present application, any circuit capable of implementing a fingerprint identification function may be adopted; in the embodiment shown in fig. 8, the case where the first thin film transistor T1, the second thin film transistor T2, and the third thin film transistor T3 are all P-type transistors is described as an example, and the P-type transistors are normally turned on by the control of a low-level signal and turned off by the control of a high-level signal; in addition, the first thin film transistor T1, the second thin film transistor T2, and the third thin film transistor T3 may also use N-type transistors, and the N-type transistors are usually turned on under the control of a high level signal and turned off under the control of a low level signal.
Fig. 9 is a schematic structural diagram of another display panel provided in the embodiment of the present application. Alternatively, referring to fig. 3, 8 and 9, the reset signal line RST and the select signal line SEL are located in the first sub-area 301.
Specifically, the display panel 100 includes a display area AA and a non-display area NA at least partially surrounding the display area AA, the non-display area NA includes a first non-display area NA1 and a second non-display area NA2 disposed opposite to each other along the first direction x, the first non-display area NA1 and/or the second non-display area NA2 includes a gate driving circuit 40, and the gate driving circuit 40 includes a plurality of cascaded shift registers 401.
Still taking the fingerprint identification circuit 10 shown in fig. 8 as an example, the reset signal line RST and the selection signal line SEL both include a first end and a second end, wherein the first end of the reset signal line RST is electrically connected to the gate of the first thin film transistor T1, the second end of the reset signal line RST is electrically connected to the corresponding shift register 401 in the gate driving circuit 40, the first end of the selection signal line SEL is electrically connected to the gate of the third thin film transistor T3, the second end of the selection signal line SEL is electrically connected to the corresponding shift register 401 in the gate driving circuit 40, and the output signal of the gate driving circuit 40 can control the on/off of the first thin film transistor T1 and the third thin film transistor T3. Obviously, the reset signal line RST and the select signal line SEL extend along the first direction x under the viewing angle shown in fig. 9, so the two signal lines 102 are disposed in the first sub-region 301 having the same extending direction as the reset signal line RST and the select signal line SEL, so as to avoid wire winding, reduce the difficulty of wire arrangement, and facilitate the simplification of the manufacturing process of the display panel 100.
Fig. 10 is a schematic structural diagram of another display panel according to an embodiment of the present disclosure. Referring to fig. 3, 8 and 10, the reference voltage signal line Vbias, the power supply line VDD and the output signal line Vout are located in the second sub-area 302.
Specifically, in the second direction y, the non-display area NA further includes a third non-display area NA3 and a fourth non-display area NA4 which are oppositely disposed, and the third non-display area NA3 and/or the fourth non-display area NA4 include the driving chip 50. In the fingerprint identification circuit 10 shown in fig. 7, the first end of the reference voltage signal line Vbias is electrically connected to the first capacitor C1, the first end of the power line VDD is electrically connected to the second pole of the first thin film transistor T1, the first end of the output signal line Vout is electrically connected to the second pole of the third thin film transistor T3, and the second end of the reference voltage signal line Vbias, the second end of the power line VDD and the second end of the output signal line Vout are all connected to the driving chip 50, i.e. in the view angle shown in fig. 7, the three signal lines 102 extend along the vertical direction, so that the reference voltage signal line Vbias, the power line VDD and the output signal line Vout are arranged in the second sub-area 302 which is the same as the extending direction of the reference voltage signal line Vbias, which is designed to be beneficial to increase the effective area of the fingerprint identification sensor 101 in the central area 20, improve the fingerprint identification accuracy, and reduce the wiring difficulty of the fingerprint identification circuit 10, thereby ensuring stable performance of the display panel 100.
Alternatively, referring to fig. 5 and 8, the first capacitor C1, the first thin film transistor T1, the second thin film transistor T2, and the third thin film transistor T3 are located in the device region 303.
In this embodiment, the circuit element 103 in the fingerprint identification circuit 10 may include a first capacitor C1, a first thin film transistor T1, a second thin film transistor T2, and a third thin film transistor T3, and the circuit element 103 is located in the device region 303 of the peripheral region 30. Since the device region 303 is disposed in the first sub-region 301 adjacent to the second sub-region 302 or in the second sub-region 302 adjacent to the first sub-region 301, the distance between the device region 303 and the first sub-region 301 and the distance between the device region 303 and the second sub-region 302 can be balanced, so that the length of the signal line 102 can be minimized whether the reset signal line RST and the select signal line SEL of the first sub-region 301 are connected to the circuit element 103 or the reference voltage signal line Vbias, the power supply line VDD, and the output signal line Vout of the second sub-region 302 are connected to the circuit element 103, which is favorable for simplifying the manufacturing process and saving the manufacturing cost of the display panel 100.
Fig. 11 shows a cross-sectional view CC' of the sub-region provided in the embodiment of fig. 5. As shown in fig. 11, the display panel 100 includes an array substrate 60, the array substrate 60 includes a substrate 61, and a plurality of thin film transistors 62 and a plurality of fingerprint recognition sensors 101 located at one side of the substrate 61;
the thin film transistor 62 includes a gate T1, a source T2, a drain T3, and an active layer T4, and the fingerprint sensor 101 includes a first semiconductor portion 101a and a second semiconductor portion 101b, where the first semiconductor portion 101a is disposed on the same layer as the active layer T4, and the second semiconductor portion 101b is located on a side of the first semiconductor portion 101a away from the substrate 61.
Specifically, the display panel 100 includes an array substrate 60, the array substrate 60 including a substrate 61, and a plurality of thin film transistors 62 and a plurality of fingerprint recognition sensors 101 located at one side of the substrate 61; the thin film transistor includes a gate T1, a source T2, a drain T3, and an active layer T4, and the fingerprint sensor 101 includes a first semiconductor portion 101a disposed on the same layer as the active layer T4 and a second semiconductor portion 101b disposed on a side of the first semiconductor portion 101a away from the base substrate 61. Illustratively, the first semiconductor portion 101a of the fingerprint sensor 101 is made of a low-temperature polysilicon material, and the second semiconductor portion 101b is made of an amorphous silicon material, which has good photosensitivity, so that the photosensitivity of the fingerprint sensor 101 can be improved, and the fingerprint accuracy can be improved. In addition, the first semiconductor portion 101a of the fingerprint sensor 101 is disposed on the same layer as the active layer T4, and the conventional film structure of the display panel 100 is utilized, so that the thickness of the display panel 100 is not increased, and the number of processes of the display panel 100 is reduced.
It should be noted that, in this embodiment, the thin film transistor 62 with a top gate structure (i.e., the gate T1 is located on the side of the active layer T4 away from the substrate) shown in fig. 11 is taken as an example for schematic illustration, and in some other embodiments of the present application, the thin film transistor 62 with a bottom gate structure (i.e., the gate T1 is located on the side of the active layer T4 close to the substrate) may also be used, which is not specifically limited in this application.
Referring to fig. 5 and 11, in the present embodiment, the fingerprint sensor 101 does not overlap the circuit elements 103 and the signal lines 102 in the peripheral area 30 along a direction perpendicular to the plane of the display panel 100.
Specifically, in the embodiment shown in fig. 11, the gate T1 of the thin film transistor 62 is located on a first metal layer, the source T2 and the drain T3 are located on a second metal layer, and the signal line 102 in the fingerprint identification circuit 10 is formed on the first metal layer or the second metal layer, that is, the fingerprint identification sensor 101 and the signal line 102 are disposed on the same layer. This application is through setting up circuit element 103 and the signal line 102 all not overlap in fingerprint identification sensor 101 and the peripheral region 30, can avoid signal line 102 or circuit element 103 in the peripheral region 30 to cause the interference to fingerprint identification sensor 101, especially can avoid signal line 102 to alternate between fingerprint identification sensor 101, not only is favorable to improving fingerprint identification's accuracy, also can reduce display panel 100's short circuit risk.
Fig. 12 is a CC cross-section of a sub-region provided in an embodiment of the present application. Alternatively, as shown in fig. 12, the display panel 100 includes an array substrate 60, the array substrate 60 includes a substrate 61, a plurality of thin film transistors 62, and a plurality of fingerprint sensor 101, wherein the fingerprint sensor 101 is located on a side of the thin film transistors 62 far away from the substrate 61.
It should be understood that, for clarity of illustrating the technical solution of the present embodiment, only a part of the film layer structure of the array substrate 60 is illustrated in fig. 11 and 12. Specifically, fig. 12 is different from fig. 11 in that the fingerprint sensor 101 is located on a side of the thin film transistor 62 away from the substrate 61, that is, the fingerprint sensor 101 is not located on the same layer as the signal line 102 in the fingerprint identification circuit 10, and this design can avoid the signal line 102 in the fingerprint identification circuit 10 from interfering with the fingerprint sensor 101, thereby ensuring the fingerprint identification accuracy of the display panel 100.
Fig. 13 is another schematic structural diagram of the sub-region provided in the embodiment of fig. 1. Alternatively, as shown in fig. 12 and 13, at least a portion of the fingerprint sensor 101 overlaps the circuit elements 103 and the signal lines 102 in the peripheral area 30 in a direction perpendicular to the plane of the display panel 100.
In this embodiment, when the fingerprint sensor 101 and the signal line 102 of the fingerprint sensing circuit 10 are located on different layers, at least a portion of the fingerprint sensor 101 may overlap the circuit elements 103 and the signal line 102 in the peripheral region 30, so that the areas of the central region 20 and the peripheral region 30 in the respective sub-regions BA may be increased appropriately. Obviously, after the area of the central area 20 is increased, the effective area of each fingerprint identification sensor 101 can be increased, so that the reflected light of the finger, which can be received by the fingerprint identification sensor 101, is increased, which is beneficial to ensuring the accuracy of fingerprint identification; meanwhile, the gate T1 of the thin film transistor 62 is located on the first metal layer, the source T2 and the drain T3 are located on the second metal layer, and the signal line 102 in the fingerprint identification circuit 10 is formed on the first metal layer or the second metal layer, in the present application, the fingerprint identification sensor 101 is disposed on one side of the signal line 102 away from the substrate base 61, that is, above the signal line 102, so that the fingerprint identification sensor 101 is not shielded from receiving fingerprint reflected light, and the fingerprint identification precision of the display panel 100 is effectively ensured; on the other hand, after the area of the peripheral region 30 in the sub-region BA is increased, the distance between the plurality of signals located in the peripheral region 30 is increased, so that the generation of parasitic capacitance is avoided, and the accuracy of fingerprint identification is further improved.
Fig. 14 is another equivalent circuit diagram of a fingerprint identification circuit provided in an embodiment of the present application. Optionally, referring to fig. 3 and 14, in each sub-area BA, the fingerprint identification circuit 10 includes a plurality of fingerprint identification sensors 101 connected in parallel.
In this embodiment, a plurality of fingerprint identification sensors 101 are disposed in each sub-area BA, and all the fingerprint sensors in each sub-area BA are connected in parallel. It can be understood that, after receiving the reflected light of the finger, the fingerprint sensor 101 converts the light signal into a current signal, so that the negative electrode potential of the fingerprint sensor 101 changes, that is, the potential of the second plate of the first capacitor C1 changes. In the data reading stage, the third thin film transistor T3 is turned on, the driving chip 50 reads the potential variation of the second plate in the first capacitor C1, the magnitude of the current signal can be determined according to the potential variation, and the fingerprint of the finger can be identified according to the magnitude of the current signal. In the present application, since the fingerprint identification circuit 10 of each sub-area BA includes a plurality of fingerprint identification sensors 101 connected in parallel, after the fingerprint identification sensors 101 receive the reflected light of the finger, each fingerprint identification sensor 101 converts the light signal into a current signal, and the current signal determined by the driving chip 50 is the sum of the current signals of the fingerprint sensors, which is equivalent to amplifying the current signal compared with a scheme in which the fingerprint identification circuit 10 includes only one fingerprint identification sensor 101, so that the result of fingerprint identification can be more accurate.
Fig. 15 is a schematic structural diagram of a display device according to an embodiment of the present disclosure. Based on the same inventive concept, the present application further provides a display device 200, as shown in fig. 15, the display device 200 includes a display module 100, and the display module 100 is the display module 100 provided in any of the embodiments of the present application, and repeated descriptions are omitted. The touch display device 200 provided by the present application may be: any product or component with touch control function and display function, such as mobile phone, tablet computer, display, notebook computer, digital photo frame, navigator, etc.
According to the embodiments, the beneficial effects of the present application are as follows:
the application provides a display panel and display device, including display area and non-display area, the display area includes the fingerprint identification district, and this fingerprint identification district is divided into a plurality of sub-areas that are the array and arrange, and each sub-area includes at least one fingerprint identification circuit, and every fingerprint identification circuit includes at least one fingerprint identification sensor, many signal lines and a plurality of circuit component. Among the correlation technique, the signal line interlude of fingerprint identification circuit sets up between the fingerprint identification sensor, and leave certain space of dodging between signal line and each fingerprint identification sensor, more display area can be taken up to this kind of design, this application is through dividing the subregion into central zone and peripheral area, and concentrate the signal line in the fingerprint identification circuit and set up in peripheral area, the fingerprint identification sensor sets up in central zone, can make the effective area maximize of each fingerprint identification sensor, and then improve the light inlet quantity of fingerprint identification sensor and fingerprint identification's precision, display panel's short circuit risk has also been reduced simultaneously.
Although some specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (12)
1. A display panel, comprising: a display area and a non-display area at least partially surrounding the display area;
the display area comprises a fingerprint identification area, the fingerprint identification area comprises a plurality of sub-areas which are arranged in an array, and each sub-area comprises at least one fingerprint identification circuit; the fingerprint identification circuit comprises at least one fingerprint identification sensor, a plurality of signal lines and a plurality of circuit elements;
each sub-area is provided with a central area and a peripheral area, at least part of the fingerprint identification sensor is positioned in the central area, and the circuit element and at least part of the signal line are positioned in the peripheral area;
the peripheral region comprises a first sub-region and a second sub-region, wherein the first sub-region extends along a first direction, the second sub-region extends along a second direction, and the first direction is crossed with the second direction;
at least part of the signal lines are positioned in the first sub-area, and at least part of the signal lines are positioned in the second sub-area;
the first sub-region comprises a device region adjacent to the second sub-region; alternatively, the second sub-region comprises a device region, the device region being adjacent to the first sub-region;
at least a portion of the circuit element is located in the device region;
the plurality of signal lines include at least one of a reset signal line, a selection signal line, a reference voltage signal line, a power supply line, and an output signal line, and the circuit element includes at least one of a first capacitor, a first thin film transistor, a second thin film transistor, and a third thin film transistor;
the reference voltage signal line is electrically connected with a first end of the first capacitor, a grid electrode of the first thin film transistor is electrically connected with the reset signal line, a first pole of the first thin film transistor is electrically connected with a cathode of the fingerprint identification sensor, a second end of the first capacitor and a grid electrode of the second thin film transistor, a second pole of the first thin film transistor is electrically connected with the power line and a first pole of the second thin film transistor, a second pole of the second thin film transistor is electrically connected with a first pole of the third thin film transistor, a grid electrode of the third thin film transistor is electrically connected with the selection signal line, and a second pole of the third thin film transistor is electrically connected with the output signal line.
2. The display panel according to claim 1, wherein in the same row of sub-regions, each of the first sub-regions is connected to form a first region extending along the first direction, and the fingerprint identification circuit in each of the sub-regions shares a signal line in the first region.
3. The display panel according to claim 2, wherein in the same column of sub-regions, each of the second sub-regions is connected to form a second region extending along the second direction, and the fingerprint identification circuits in each of the sub-regions share the signal lines in the second region.
4. The display panel according to claim 1, wherein the reset signal line and the selection signal line are located in the first sub-area.
5. The display panel according to claim 4, wherein the reference voltage signal line, the power supply line, and the output signal line are located in the second sub-area.
6. The display panel according to claim 5, wherein the first capacitor, the first thin film transistor, the second thin film transistor, and the third thin film transistor are located in the device region.
7. The display panel according to claim 1, comprising an array substrate, wherein the array substrate comprises a substrate, and a plurality of thin film transistors and a plurality of fingerprint recognition sensors located on one side of the substrate;
the thin film transistor comprises a grid electrode, a source electrode, a drain electrode and an active layer, the fingerprint identification sensor comprises a first semiconductor part and a second semiconductor part, the first semiconductor part and the active layer are arranged on the same layer, and the second semiconductor part is located on one side, far away from the substrate, of the first semiconductor part.
8. The display panel according to claim 7, wherein the fingerprint sensor does not overlap with circuit elements and signal lines in the peripheral region in a direction perpendicular to a plane of the display panel.
9. The display panel according to claim 1, comprising an array substrate comprising a substrate, a plurality of thin film transistors and a plurality of the fingerprint sensor, wherein the fingerprint sensor is located on a side of the thin film transistors away from the substrate.
10. The display panel according to claim 9, wherein at least a portion of the fingerprint sensor overlaps with circuit elements and signal lines in the peripheral region in a direction perpendicular to a plane of the display panel.
11. The display panel according to claim 1, wherein the fingerprint recognition circuit comprises a plurality of the fingerprint recognition sensors connected in parallel in each of the sub-regions.
12. A display device comprising the display panel according to any one of claims 1 to 11.
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| CN108269503A (en) * | 2018-03-26 | 2018-07-10 | 上海天马微电子有限公司 | A kind of display panel and display device |
| CN108806578A (en) * | 2018-06-08 | 2018-11-13 | 上海天马有机发光显示技术有限公司 | A kind of display panel and display device |
| CN110737126A (en) * | 2019-10-31 | 2020-01-31 | 厦门天马微电子有限公司 | Display panel and display device |
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| US9679182B2 (en) * | 2014-11-12 | 2017-06-13 | Crucialtec Co., Ltd. | Display apparatus capable of image scanning and driving method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108269503A (en) * | 2018-03-26 | 2018-07-10 | 上海天马微电子有限公司 | A kind of display panel and display device |
| CN108806578A (en) * | 2018-06-08 | 2018-11-13 | 上海天马有机发光显示技术有限公司 | A kind of display panel and display device |
| CN110737126A (en) * | 2019-10-31 | 2020-01-31 | 厦门天马微电子有限公司 | Display panel and display device |
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