CN111368805A - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN111368805A CN111368805A CN202010245864.5A CN202010245864A CN111368805A CN 111368805 A CN111368805 A CN 111368805A CN 202010245864 A CN202010245864 A CN 202010245864A CN 111368805 A CN111368805 A CN 111368805A
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- 239000003990 capacitor Substances 0.000 claims abstract description 57
- 239000002184 metal Substances 0.000 claims description 45
- 239000004065 semiconductor Substances 0.000 claims description 29
- 239000000758 substrate Substances 0.000 claims description 25
- 230000000694 effects Effects 0.000 abstract description 7
- 101150037603 cst-1 gene Proteins 0.000 description 22
- 238000000034 method Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000005530 etching Methods 0.000 description 6
- 230000003071 parasitic effect Effects 0.000 description 4
- 238000012790 confirmation Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
Abstract
The invention discloses a display panel and a display device. The display area of the display panel is provided with a plurality of pixel units which are arranged in an array; the pixel unit includes a common electrode; the display area is also provided with at least one fingerprint identification unit; the fingerprint identification unit comprises a storage capacitor; the display panel further includes a common voltage signal line and a first bias signal line; the first plate of the storage capacitor is electrically connected with the first bias signal line; the common electrode is electrically connected with the common voltage signal line; the common voltage signal line is insulated from the first bias signal line. Because the common voltage signal line is insulated from the first bias signal line, the interference of the storage capacitor of the fingerprint identification unit on the common voltage signal of the common electrode during display can be prevented, and the display effect is prevented from being influenced.
Description
Technical Field
The invention relates to the technical field of novel display, in particular to a display panel and a display device.
Background
In recent years, with the spread of mobile display products, information security is receiving attention from consumers. Because the fingerprint has the characteristics of uniqueness and difficulty in copying, the fingerprint identification technology is widely applied to unlocking, payment confirmation and the like of mobile display products.
In the prior art, a bias signal is generally transmitted to the fingerprint identification unit through a common electrode of a pixel unit. In the display stage, a common voltage signal is provided to the pixel unit through the common electrode, and a potential voltage is also provided to the fingerprint identification unit, so that a storage capacitor in the fingerprint identification unit generates a parasitic capacitor, interference is generated on the common voltage signal of the common electrode, and the display effect of the display panel is influenced.
Disclosure of Invention
The invention provides a display panel and a display device, which are used for preventing a storage capacitor of a fingerprint identification unit from generating interference on a common voltage signal of a common electrode during display and avoiding influencing the display effect.
In a first aspect, an embodiment of the present invention provides a display panel, including: the display area of the display panel is provided with a plurality of pixel units which are arranged in an array; the pixel unit includes a common electrode;
the display area is also provided with at least one fingerprint identification unit; the fingerprint identification unit comprises a storage capacitor;
the display panel further includes a common voltage signal line and a first bias signal line; the first plate of the storage capacitor is electrically connected with the first bias signal line; the common electrode is electrically connected with the common voltage signal line; the common voltage signal line is insulated from the first bias signal line.
In a second aspect, an embodiment of the present invention provides a display device, including: any one of the display panels provided in the first aspect;
the device also comprises a driving chip;
the driving chip comprises a first port and a second port; the first bias signal line is electrically connected with the driving chip through the first port; the common voltage signal line is electrically connected with the driving chip through the second port.
In the technical scheme provided by the embodiment of the invention, the first bias signal line is electrically connected with the first pole plate of the storage capacitor, and when fingerprint identification is carried out, the first bias signal line provides the first bias signal for the storage capacitor so as to charge the storage capacitor; the common voltage signal line is electrically connected to the common electrode, and supplies a common voltage signal to the common electrode of the pixel unit through the common voltage signal line during display. Because the common voltage signal line and the first bias signal line are insulated, when the pixel unit displays, the interference of the storage capacitor of the fingerprint identification unit on the common voltage signal of the common electrode can be prevented, and the display effect is prevented from being influenced.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, a brief description is given below of the drawings used in describing the embodiments. It should be clear that the described figures are only views of some of the embodiments of the invention to be described, not all, and that for a person skilled in the art, other figures can be derived from these figures without inventive effort.
Fig. 1 is an equivalent circuit diagram of a fingerprint identification unit provided in the prior art;
FIG. 2 is an equivalent circuit diagram of a fingerprint identification unit according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional structure diagram of a display panel according to an embodiment of the invention;
fig. 4 is a schematic cross-sectional view illustrating another display panel according to an embodiment of the present invention;
fig. 5 is a schematic cross-sectional view illustrating another display panel according to an embodiment of the present invention;
fig. 6 and fig. 7 are schematic top-view structural diagrams of a display panel according to an embodiment of the present invention;
fig. 8 is a schematic cross-sectional view illustrating another display panel according to an embodiment of the present invention;
fig. 9 is a schematic cross-sectional view illustrating another display panel according to an embodiment of the present invention;
fig. 10 is a schematic cross-sectional view illustrating a display panel according to another embodiment of the present invention;
fig. 11 is a schematic top view of a display device according to an embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures.
When a finger is placed on the display panel for fingerprint identification, the ridges in the finger are in contact with the surface of the display panel, the valleys are not in contact with the surface of the display panel, light irradiates the valleys and the ridges of the finger to form reflected light, the reflected light enters the photosensitive element, and the photosensitive element receives the reflected light (fingerprint signal light) and generates an electric signal related to the reflected light. Because the finger has ridges and valleys, the intensity of the light reflected by different positions of the fingerprint is different, and finally, the intensity of the light received by different light sensing elements is different. And under different light intensities, the electric signals fed back by the photosensitive elements are different. Therefore, the fingerprint characteristics of the finger can be obtained through the magnitude of the electric signals fed back by the photosensitive elements, and the fingerprint identification function is realized.
The working process of the display panel comprises a display stage and a fingerprint identification stage, and the display stage and the fingerprint identification stage are carried out in a time-sharing mode. Fig. 1 is an equivalent circuit diagram of a fingerprint identification unit provided in the prior art, and the fingerprint identification process is described in detail below by taking fig. 1 as an example.
The fingerprint recognition unit is generally provided with a reset transistor Trst, a driving transistor Tsf, a selection output transistor Tsel, a light sensing element PD, and a storage capacitor Cst. The positive electrode of the photosensitive element PD and the first plate of the storage capacitor Cst are connected to a driving chip (not shown) through a common electrode, the driving chip provides a bias voltage Vbias to the fingerprint identification unit through the common electrode, the negative electrode of the photosensitive element PD is respectively and electrically connected to the second plate of the storage capacitor Cst, the first end of the reset transistor Trst and the control end of the driving transistor Tsf, the second end of the reset transistor Trst and the first end of the driving transistor Tsf are respectively connected to a power supply VDD, the second end of the driving transistor Tsf is connected to the first end of the selection output transistor Tsel, and the second end of the selection output transistor Tsel is connected to a signal output end.
The fingerprint identification phase comprises a reset phase, a light receiving phase and a data reading phase. In the reset stage, the driving chip controls the reset transistor Trst of the fingerprint identification unit to be turned on, and charges the storage capacitor Cst under the action of the bias voltage Vbias and the power voltage VDD until the storage capacitor Cst is charged. In the light receiving stage, the driving chip controls the reset transistor Trst of the fingerprint identification unit to be turned off. When a user touches the display panel, reflected light formed by reflection of a finger fingerprint is incident on the photosensitive element PD in the fingerprint identification unit, and the photosensitive element PD is in an operating state under the action of the bias voltage Vbias, so that the photosensitive element PD receives the reflected light formed by reflection of the finger fingerprint and forms a photocurrent, and the potential of the negative electrode of the photosensitive element PD changes, that is, the potential of the second plate of the storage capacitor Cst changes. In the data reading stage, the driving chip controls the selective output transistor Tsel of the fingerprint identification unit to be turned on, so that the potential variation of the second plate of the storage capacitor Cst can be read, the magnitude of the photocurrent can be determined, and the fingerprint of the finger can be identified according to the magnitude of the photocurrent.
However, in the prior art, the storage capacitor and the photosensitive element in the fingerprint identification unit are electrically connected with a common voltage signal line through a common electrode, the common voltage signal line is electrically connected with a driving chip, and the driving chip provides bias signals for the storage capacitor and the photosensitive element through the common voltage signal line and the common electrode. In the display stage, the driving chip provides the common voltage signal Vcom to the pixel circuit through the common voltage signal line and the common electrode, so that the storage capacitor of the fingerprint identification unit is electrically connected with the common electrode at the moment, and the storage capacitor of the fingerprint identification unit generates a parasitic capacitor to interfere with the common voltage signal on the common electrode, thereby affecting the display effect of the display panel.
Accordingly, embodiments of the present invention provide a display panel to solve the problem that a storage capacitor of a fingerprint identification unit interferes with a common voltage signal on a common electrode. Fig. 2 is an equivalent circuit diagram of a fingerprint identification unit according to an embodiment of the present invention, and fig. 3 is a schematic cross-sectional structure diagram of a display panel according to an embodiment of the present invention. With reference to fig. 2 and fig. 3, the display area of the display panel according to the embodiment of the present invention is provided with a plurality of pixel units 110 arranged in an array; the pixel unit 110 includes a common electrode 111. The display area is also provided with at least one fingerprint recognition unit 120; the fingerprint identification unit 120 includes a storage capacitor Cst. The display panel 100 further includes a common voltage signal line (not shown in fig. 3) and a first bias signal line 131; the first plate Cst1 of the storage capacitor Cst is electrically connected to the first bias signal line 131; the common electrode 111 is electrically connected to a common voltage signal line; the common voltage signal line is insulated from the first bias signal line 131. The common voltage signal line in the embodiment of the present invention may be disposed, for example, in a non-display area of the display panel, and the common electrode may be electrically connected to the common voltage signal line in the non-display area, so that the common electrode may receive a common voltage signal through the common voltage signal line.
The storage capacitor Cst is electrically connected to one end of the first bias signal line 131, the other end of the first bias signal line 131 is connected to a driving chip (not shown in fig. 3), and in the fingerprint identification stage, the driving chip transmits the first bias signal Vbias1 to the storage capacitor Cst through the first bias signal line 131, and the storage capacitor Cst is charged under the action of the first bias signal Vbias1 and the power supply VDD until the charging is completed; the common electrode 111 is connected to a common voltage signal line, and the other end of the common voltage signal line is connected to the driving chip. In the display stage, the driving chip transmits a common voltage signal to the common electrode 111 of the pixel unit 110 through the common voltage signal line. Since the common voltage signal line is insulated from the first bias signal line 131, the driving chip supplies the common voltage signal to the common electrode 111 through the common voltage signal line and supplies the bias signal to the storage capacitor of the fingerprint recognition unit through the first bias signal line. Therefore, when the pixel unit displays, the storage capacitor Cst of the fingerprint identification unit does not form a parasitic capacitor any more, and the storage capacitor Cst does not interfere with the common voltage signal on the common electrode any more, so that the influence of the fingerprint identification unit on the common voltage signal on the common electrode is reduced, and the display effect of the display panel is improved.
Optionally, with continued reference to fig. 2 and 3, the fingerprint identification unit 120 further includes a photosensitive element PD; the display panel 100 further includes a second bias signal line 132; the photosensitive element PD is electrically connected to the second bias signal line 132; the second bias signal line 132 is insulated from the common voltage signal line.
Specifically, the positive electrode of the photosensitive element PD is electrically connected to one end of the second bias signal line 132, the other end of the second bias signal line 132 is electrically connected to the driving chip, in the fingerprint identification phase, the driving chip provides the second bias signal Vbias2 to the photosensitive element PD through the second bias signal line 132, and the photosensitive element PD can only maintain the working state under the action of the second bias signal Vbias2, so as to receive the fingerprint reflected light and generate the photocurrent. Because the common voltage signal line is insulated from the second bias signal line 132, the problem of parasitic capacitance caused by the electrical connection between the photosensitive element PD and the common electrode in the display stage is avoided, that is, the photosensitive element PD does not affect the common voltage signal of the common electrode in the display stage, thereby improving the display effect of the display panel.
Optionally, fig. 4 is a schematic cross-sectional structure diagram of another display panel provided in an embodiment of the present invention. As shown in fig. 4, the second bias signal line 132 may be multiplexed as the first bias signal line. In the fingerprint recognition stage, it is necessary to simultaneously input the same bias signal, i.e., the first bias signal Vbias1 and the second bias signal Vbias2, to the light sensing element PD and the storage capacitor Cst, and thus the second bias signal line 132 may be multiplexed as the first bias signal line. The second bias signal line and the first bias signal line are arranged to be multiplexed, namely, the driving chip provides bias signals to the photosensitive element and the storage capacitor of the fingerprint identification unit through the same signal line, the number of metal wires of the display panel can be reduced, and the complexity of a circuit is reduced.
Alternatively, with continued reference to fig. 3, the first bias signal line 131 may also be disposed at the same layer as the first plate Cst 1. Specifically, as shown in fig. 3, the first bias signal line 131 may be electrically connected to the first plate Cst1 through a bridge structure BR, or the first bias signal line 131 may also be directly electrically connected to the first plate Cst 1. It should be noted that the bridge-spanning structure BR in fig. 3 may be formed by using a film layer having a conductive capability originally in the display panel, for example, a source/drain electrode layer of a transistor. Because the first bias signal line 131 and the first polar plate Cst1 are disposed on the same layer, only one etching process is required during manufacturing, and no mask plate needs to be manufactured for the first bias signal line 131 and the first polar plate Cst1, thereby saving cost, reducing the number of processes, and improving production efficiency.
Optionally, fig. 5 is a schematic cross-sectional structure diagram of another display panel provided in an embodiment of the present invention. As shown in fig. 5, the first bias signal line 131 may also be disposed in a different layer from the first plate Cst1, and the first bias signal line 131 and the first plate Cst1 are electrically connected through a via. It should be noted that the first bias signal line 131 in fig. 5 may be formed by using a film layer having a conductive capability originally in the display panel, for example, a source/drain electrode layer of a transistor, or may be formed in another film layer, and the present application is not limited specifically.
Optionally, fig. 6 and fig. 7 are schematic top view structures of a display panel according to an embodiment of the present invention. As shown in fig. 6, the display panel 100 includes a plurality of data lines 140 and a plurality of scan lines 150; the plurality of data lines 140 and the plurality of scan lines 150 are insulated and crossed to define a plurality of pixel units 110; the plurality of fingerprint recognition units 120 are distributed in an array.
The first bias signal line 131 is parallel to the data line 140; the first plates of the storage capacitors Cst of the fingerprint identification units 120 in the same column are connected to the same first bias signal line 131; the first bias signal line 131 is disposed in a different layer from the scan line 150.
For example, the display panel 100 includes pixel units 110 arranged in 3 × 3 and fingerprint identification units 120 arranged in 3 × 3, the same row of pixel units 110 is connected to the same scan line 150, the same column of pixel units 110 is connected to the same data line 140, the storage capacitors Cst of the fingerprint identification units 120 are connected to the same first bias signal line 131, and the first bias signal line 131 is electrically connected to a driving chip (not shown in fig. 6).
Optionally, with continued reference to fig. 3, the display panel 100 includes: a substrate 150; a first semiconductor layer on the substrate 150, the first semiconductor layer including the N-type semiconductor layer NL of the photosensitive element PD; a first insulating layer 161 on a side of the first semiconductor layer facing away from the substrate 150; a first metal layer 171 located on a side of the first insulating layer 161 facing away from the substrate 150, the first metal layer 171 including a first plate Cst1 of the storage capacitor Cst; a second insulating layer 162 on a side of the first metal layer 171 facing away from the substrate 150; a first via PV1, the first via PV1 penetrating the first insulating layer 161 and the second insulating layer 162 to expose a portion of the N-type semiconductor layer NL; a second semiconductor layer including an intrinsic semiconductor layer IS of the photosensitive element PD, located within the first via PV 1; a third semiconductor layer, including the P-type semiconductor layer PL of the photo-sensing element PD, located in the first via PV1 and on a side of the intrinsic semiconductor layer IS facing away from the substrate 150; a second metal layer 172 on a side of the second insulating layer 162 facing away from the substrate 150; a planarization layer 180 on a side of the third semiconductor layer facing away from the substrate 150; a third insulating layer 163 on a side of the planarization layer 180 facing away from the substrate 150; the second via PV2 penetrates the third insulating layer 163 and the planarization layer 180 to expose a portion of the P-type semiconductor layer PL.
A first conductive layer 190 including the first electrode 121 of the photosensitive element PD and the common electrode 111; on the side of the third insulating layer 163 facing away from the substrate 150; the first pole 121 of the photosensitive element PD is connected to the P-type semiconductor layer PL through the second via PV 2.
Specifically, the first pole 121 and the common electrode 111 of the photosensitive element PD are both transparent electrodes, in the fingerprint identification stage, the driving chip transmits the second bias signal Vbias2 to the P-type semiconductor layer PL of the photosensitive element PD through the second bias signal line 132 and the first pole 121 of the photosensitive element PD, the photosensitive element PD enters an operating state after receiving the second bias signal Vbias2, the fingerprint reflected light enters the photosensitive element PD through the first pole 121, and the photosensitive element PD receives the fingerprint reflected light and generates a photocurrent. Because the first pole 121 is a transparent electrode, the first pole 121 does not shield the fingerprint reflected light, and the photosensitive element PD can be ensured to receive the fingerprint reflected light. The first electrode 121 of the photosensitive element PD is insulated from the common electrode 111, so that the photosensitive element PD does not interfere with the common voltage signal of the common electrode in the display stage. In addition, because the first pole 121 and the common electrode 111 of the photosensitive element PD are arranged in the same layer, only one etching process is needed during manufacturing, and no mask plate needs to be manufactured for the first pole 121 and the common electrode 111 of the photosensitive element PD, so that the cost is saved, the number of manufacturing processes is reduced, and the production efficiency is improved.
Optionally, with continued reference to fig. 3, the first metal layer 171 includes a first bias signal line 131. Specifically, the first bias signal line 131 and the first plate Cst1 of the storage capacitor Cst may be electrically connected through a bridge structure BR, or the first bias signal line 131 and the first plate Cst1 of the storage capacitor Cst are directly electrically connected, the first metal layer 171 includes the gate electrode, the first plate Cst1 of the storage capacitor Cst, and the first bias signal line 131, that is, the gate electrode, the first plate Cst1 of the storage capacitor Cst, and the first bias signal line 131 are disposed on the same layer, so that only one etching process is needed during manufacturing, and no mask plate needs to be manufactured for the gate electrode, the first plate Cst1 of the storage capacitor Cst, and the first bias signal line 131, respectively, which saves cost, reduces the number of processes, and improves production efficiency. In other embodiments, it may also be that the second metal layer 172 includes the first bias signal line 131, as shown in fig. 5, the second metal layer 172 includes a source drain electrode of the transistor and the first bias signal line 131, and the first bias signal line 131 is electrically connected to the first plate Cst1 of the storage capacitor Cst through a via, that is, the source drain electrode and the first bias signal line 131 are disposed in the same layer.
Optionally, fig. 8 is a schematic cross-sectional structure diagram of another display panel according to an embodiment of the present invention. As shown in fig. 8, the display panel 100 further includes a light-shielding layer 210 on the substrate 150, and a buffer layer 220 on a side of the light-shielding layer 210 facing away from the substrate 150; the buffer layer 220 is located between the first semiconductor layer and the light-shielding layer 210.
The light-shielding layer includes a light-shielding pattern 211 and a first bias signal line 131.
Specifically, the light shielding pattern 211 and the first bias signal line 131 are disposed on the same layer, and the first bias signal line 131 is electrically connected to the first plate Cst1 of the storage capacitor Cst through the via hole, so that only one etching process is required during manufacturing, and no mask plate needs to be manufactured for the light shielding pattern 211 and the first bias signal line 131, thereby saving cost, reducing the number of processes, and improving production efficiency. In addition, the first bias signal line 131 is located on the side of the pixel unit 110 close to the substrate 150, and does not affect the aperture ratio of the display panel.
Optionally, fig. 9 is a schematic cross-sectional structure diagram of another display panel according to an embodiment of the present invention. As shown in fig. 9, the common electrode 111 is multiplexed as a touch electrode 220.
The display panel 100 further includes a third metal layer; the third metal layer is insulated from the first metal layer 171 and the second metal layer 172; the third metal layer includes a first bias signal line 131 and a plurality of touch electrode lines 230; the touch electrode 220 is electrically connected to at least one touch electrode line 230.
Specifically, the first bias signal line 131 and the touch electrode line 230 are disposed on the same layer, the touch electrode 220 is electrically connected to the touch electrode line 230 through a via hole, the first plate Cst1 of the storage capacitor Cst is electrically connected to the first bias signal line 131 through a via hole, and only one etching process is required when the first bias signal line 131 and the touch electrode line 230 are manufactured, and no mask plate needs to be manufactured for the first bias signal line 131 and the touch electrode line 230, so that the cost is saved, the number of processes is reduced, and the production efficiency is improved. It should be noted that fig. 9 only exemplarily shows that the touch electrode line 23 is disposed between the second metal layer 172 and the first conductive layer 190, and a person skilled in the art may set a specific position of the touch electrode line 230 according to an actual requirement of the display panel, which is not limited in this application.
Optionally, fig. 10 is a schematic cross-sectional structure diagram of another display panel according to an embodiment of the present invention. As shown in fig. 10, the display panel 100 further includes a fourth metal layer; the fourth metal layer is insulated from the first metal layer 171 and the second metal layer 172; the fourth metal layer includes a first bias signal line 131.
Specifically, in the conventional process of the display panel, a process is added, a mask for the first bias signal line 131 is first fabricated, and then the first bias signal line 131 is formed by an etching process, the first bias signal line 131 is electrically connected to the first plate Cst1 of the storage capacitor Cst through a via hole, and the fourth metal layer is insulated from the first metal layer 171 and the second metal layer 172, so that an area corresponding to the non-open area on the fourth metal layer has enough space for the first bias signal line 131 to be disposed, and the aperture ratio of the display panel is not affected. Preferably, the first bias signal line 131 is disposed between the first metal layer 171 and the second metal layer 172, the first bias signal line 131 is connected to the first plate Cst1 of the storage capacitor Cst through a via, as shown in fig. 10, or the first bias signal line 131 is disposed between the first metal layer 171 and the light shielding layer 210, the first bias signal line 131 is connected to the first plate Cst1 of the storage capacitor Cst through a via, and the first bias signal line 131 is disposed adjacent to the first plate Cst1 of the storage capacitor Cst, so that the process of forming a via hole between the first bias signal line 131 and the first plate Cst1 of the storage capacitor Cst is easier to control and easier to implement in terms of process.
It should be noted that fig. 10 only exemplarily shows that the first bias signal line 131 is disposed between the first metal layer 171 and the second metal layer 172, and a person skilled in the art may set a specific position of the first bias signal line 131 according to actual requirements of the display panel, and the application is not limited in particular.
Fig. 11 is a schematic top view of a display device according to an embodiment of the present invention. As shown in fig. 11, the display device 200 includes any one of the display panels 100 in the above embodiments; a driving chip 240 is also included; the driver chip 240 includes a first port Out1 and a second port Out 2; a first bias signal line (not shown in fig. 11) is electrically connected to the driver chip 240 through a first port Out 1; the common voltage signal line (not shown in fig. 11) is electrically connected to the driving chip 240 through the second port Out 2. The driving chip 240 transmits a first bias signal to the first bias signal line through the first port Out1, and transmits a common voltage signal to the common voltage signal line through the second port Out 2.
The display device 200 provided in the embodiment of the invention has the advantages of the display panel 100 in the above embodiments, and details are not repeated herein. In a specific implementation, the display device 200 may be a mobile phone, a tablet computer, or any display product or component with a fingerprint identification function, such as a television, a display area, a digital photo frame, a navigator, an intelligent wearable display device, and the like, which is not particularly limited in this embodiment of the present invention.
The foregoing is considered as illustrative of the preferred embodiments of the invention and technical principles employed. The present invention is not limited to the specific embodiments herein, and it will be apparent to those skilled in the art that various changes, rearrangements, and substitutions can be made without departing from the scope of the invention. Therefore, although the present invention has been described in more 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 claims.
Claims (12)
1. A display panel is characterized in that a display area of the display panel is provided with a plurality of pixel units which are arranged in an array; the pixel unit includes a common electrode;
the display area is also provided with at least one fingerprint identification unit; the fingerprint identification unit comprises a storage capacitor;
the display panel further includes a common voltage signal line and a first bias signal line; the first plate of the storage capacitor is electrically connected with the first bias signal line; the common electrode is electrically connected with the common voltage signal line; the common voltage signal line is insulated from the first bias signal line.
2. The display panel according to claim 1, wherein the fingerprint recognition unit further comprises a light sensing element; the display panel further includes a second bias signal line;
the photosensitive element is electrically connected with the second bias signal line; the second bias signal line is insulated from the common voltage signal line.
3. The display panel according to claim 1, wherein the second bias signal line is multiplexed into a first bias signal line.
4. The display panel according to claim 1, wherein the first bias signal line is disposed in the same layer as the first plate.
5. The display panel according to claim 1, wherein the first bias signal line is provided in a different layer from the first plate, and the first bias signal line is electrically connected to the first plate through a via hole.
6. The display panel according to claim 1, further comprising a plurality of data lines and a plurality of scan lines; a plurality of data lines and a plurality of scanning lines are insulated and crossed to define a plurality of pixel units; the fingerprint identification units are distributed in an array;
the first bias signal line is parallel to the data line; first polar plates of the storage capacitors of the fingerprint identification units in the same column are connected with the same first bias signal line; the first bias signal line and the scanning line are arranged in different layers;
or, the first bias signal line is parallel to the scanning line; the first polar plates of the storage capacitors of the fingerprint identification units in the same row are connected with the same first bias signal line; the first bias signal line and the data line are arranged in different layers.
7. The display panel according to claim 1, characterized in that the display panel comprises:
a substrate;
a first semiconductor layer on the substrate; the first semiconductor layer comprises an N-type semiconductor layer of the photosensitive element;
the first insulating layer is positioned on one side, away from the substrate, of the first semiconductor layer;
the first metal layer is positioned on one side, away from the substrate, of the first insulating layer; the first metal layer comprises a first plate of the storage capacitor;
the second insulating layer is positioned on one side, away from the substrate, of the first metal layer;
a first through hole; the first through hole penetrates through the first insulating layer and the second insulating layer, and part of the N-type semiconductor layer is exposed;
a second semiconductor layer including an intrinsic semiconductor layer of the photosensitive element, positioned within the first via;
the third semiconductor layer comprises a P-type semiconductor layer of the photosensitive element, is positioned in the first through hole and is positioned on one side, away from the substrate, of the intrinsic semiconductor layer;
the second metal layer is positioned on one side, away from the substrate, of the second insulating layer;
the planarization layer is positioned on one side, away from the substrate, of the third semiconductor layer;
a third insulating layer on a side of the planarization layer facing away from the substrate;
the second through hole penetrates through the third insulating layer and the planarization layer, and part of the P-type semiconductor layer is exposed;
a first conductive layer including a first pole of the photosensitive element and the common electrode; the side, facing away from the substrate, of the third insulating layer; and the first pole of the photosensitive element is connected with the P-type semiconductor layer through the second through hole.
8. The display panel according to claim 7, wherein the first metal layer or the second metal layer includes the first bias signal line.
9. The display panel according to claim 7, further comprising a light-shielding layer over the substrate, and a buffer layer on a side of the light-shielding layer facing away from the substrate; the buffer layer is positioned between the first semiconductor layer and the shading layer;
the light shielding layer includes a light shielding pattern and the first bias signal line.
10. The display panel according to claim 7, wherein the common electrode is multiplexed as a touch electrode;
the display panel further comprises a third metal layer; the third metal layer is insulated from the first metal layer and the second metal layer;
the third metal layer comprises the first bias signal line and a plurality of touch electrode lines; the touch electrode is electrically connected with at least one touch electrode wire.
11. The display panel according to claim 7, further comprising a fourth metal layer; the fourth metal layer is insulated from the first metal layer and the second metal layer; the fourth metal layer includes the first bias signal line.
12. A display device characterized by comprising the display panel according to any one of claims 1 to 11;
the device also comprises a driving chip;
the driving chip comprises a first port and a second port; the first bias signal line is electrically connected with the driving chip through the first port; the common voltage signal line is electrically connected with the driving chip through the second port.
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Application publication date: 20200703 |