CN107316884B - Display panel and display device - Google Patents
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- CN107316884B CN107316884B CN201710464029.9A CN201710464029A CN107316884B CN 107316884 B CN107316884 B CN 107316884B CN 201710464029 A CN201710464029 A CN 201710464029A CN 107316884 B CN107316884 B CN 107316884B
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- 238000003860 storage Methods 0.000 claims abstract description 53
- 239000000758 substrate Substances 0.000 claims abstract description 34
- 239000002346 layers by function Substances 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 38
- 239000004065 semiconductor Substances 0.000 claims description 25
- 239000010409 thin film Substances 0.000 claims description 15
- 229910021417 amorphous silicon Inorganic materials 0.000 claims description 6
- 239000002210 silicon-based material Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 229910004205 SiNX Inorganic materials 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000005611 electricity Effects 0.000 description 3
- 244000062793 Sorghum vulgare Species 0.000 description 2
- 235000019713 millet Nutrition 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910021476 group 6 element Inorganic materials 0.000 description 1
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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
- H10K59/40—OLEDs integrated with touch screens
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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
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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
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Abstract
The invention discloses a display panel and a display device, wherein the display panel comprises an array substrate, a plurality of organic light-emitting structures and a plurality of fingerprint identification modules, wherein the plurality of organic light-emitting structures and the plurality of fingerprint identification modules are positioned on a display area of the array substrate; each fingerprint identification module is positioned between two adjacent organic light-emitting structures; each fingerprint identification module comprises a photodiode and a storage capacitor; along the direction of keeping away from the array substrate, the fingerprint identification module comprises a first electrode, a second electrode and a third electrode; the storage capacitor comprises a first electrode and a second electrode; the photodiode comprises a second electrode, a third electrode and a PN junction positioned between the second electrode and the third electrode; the organic light-emitting structure comprises an anode, a cathode and a light-emitting functional layer positioned between the anode and the cathode along a direction far away from the array substrate; the cathode is electrically connected to the first electrode and the third electrode, respectively. By the technical scheme of the invention, the number of processes of the display panel is reduced, and the manufacturing cost of the display panel is reduced.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel and a display device.
Background
Fingerprints are unique to every person, and with the development of science and technology, various display devices with fingerprint identification functions, such as mobile phones, tablet computers, intelligent wearable devices and the like, appear in the market. Before a user operates the display device with the fingerprint identification function, the user can carry out authority verification only by touching the display device with a finger, and the authority verification process is simplified.
Among the present display device who has the fingerprint identification function, can adopt outer hanging fingerprint identification module to carry out fingerprint identification, be about to the fingerprint identification module sets up the one side of keeping away from display element at array substrate, but this kind of outer hanging fingerprint unit can influence display device to the development of narrow frame direction.
Also can be integrated in display panel with the fingerprint identification module, at present, the fingerprint identification module generally includes photodiode and storage capacitor, along the direction of keeping away from array substrate promptly, the fingerprint identification module generally includes first electrode, the second electrode, third electrode and fourth electrode, constitute the storage capacitor structure between first electrode and the second electrode, second electrode and third electrode constitute photodiode, the third electrode passes through the fourth electrode and is connected with first electrode electricity, it contains more electrode to make the fingerprint identification module like this, and because the fingerprint identification module needs to integrate in display panel, display panel's process number has been increased, display panel's cost of manufacture has been improved.
Disclosure of Invention
The invention provides a display panel and a display device, wherein the third electrode of a photodiode is electrically connected with the first electrode of a storage capacitor through a cathode of a multiplexing organic light-emitting structure, so that the photodiode and the storage capacitor in a fingerprint identification module form a complete loop, namely, the fingerprint identification function of the display panel is realized, the process number of the display panel is reduced, and the manufacturing cost of the display panel is reduced.
In a first aspect, an embodiment of the present invention provides a display panel, including:
the array substrate comprises a display area and a non-display area surrounding the display area;
the array substrate comprises a plurality of organic light-emitting structures and a plurality of fingerprint identification modules, wherein the plurality of organic light-emitting structures and the plurality of fingerprint identification modules are positioned on a display area of the array substrate;
each fingerprint identification module is positioned between two adjacent organic light-emitting structures and used for carrying out fingerprint identification according to light rays reflected to the fingerprint identification module through the touch main body;
each fingerprint identification module comprises a photodiode and a storage capacitor; along the direction far away from the array substrate, the fingerprint identification module comprises a first electrode, a second electrode and a third electrode; the storage capacitor comprises the first electrode and the second electrode; the photodiode includes the second electrode, the third electrode, and a PN junction between the second electrode and the third electrode;
the organic light-emitting structure comprises an anode, a cathode and a light-emitting functional layer positioned between the anode and the cathode along a direction far away from the array substrate; the cathode is electrically connected to the first electrode and the third electrode, respectively.
In a second aspect, an embodiment of the present invention further provides a display device, including the display panel according to the first aspect.
The embodiment of the invention provides a display panel and a display device, wherein each fingerprint identification module is arranged between two adjacent organic light-emitting structures and used for carrying out fingerprint identification according to light rays reflected to the fingerprint identification module through a touch main body, and the fingerprint identification module is integrated in the display panel while the fingerprint identification function of the display panel is realized. In addition, each fingerprint identification module in the display panel comprises a photodiode and a storage capacitor, the fingerprint identification module comprises a first electrode, a second electrode and a third electrode along the direction far away from the array substrate, the storage capacitor comprises a first electrode and a second electrode, the photodiode comprises a second electrode and a third electrode, especially, a cathode of an organic light-emitting structure is respectively electrically connected with the first electrode and the third electrode, the third electrode of the photodiode is electrically connected with the first electrode of the storage capacitor by utilizing the cathode of the organic light-emitting structure, so that the photodiode and the storage capacitor form a complete loop, namely, on the premise of ensuring the connection relation between the photodiode and the storage capacitor in the fingerprint identification module, the cathode of the organic light-emitting structure is multiplexed to replace a fourth electrode in the prior art, thus, when the fingerprint identification module is integrated in the display panel for fingerprint identification, the number of processes of the display panel is reduced, and the manufacturing cost of the display panel is reduced.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic top view of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view taken along the direction BB' in FIG. 1;
fig. 3 is a schematic circuit structure diagram corresponding to a fingerprint identification module according to an embodiment of the present invention;
fig. 4 is a working schematic diagram of a fingerprint recognition module according to an embodiment of the present invention for performing fingerprint recognition;
fig. 5 is a schematic diagram of another fingerprint identification module according to an embodiment of the present invention for performing fingerprint identification;
fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures. Throughout this specification, the same or similar reference numbers refer to the same or similar structures, elements, or processes. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The embodiment of the invention provides a display panel, which comprises an array substrate, a display panel and a display panel, wherein the array substrate comprises a display area and a non-display area surrounding the display area; the array substrate comprises a plurality of organic light-emitting structures and a plurality of fingerprint identification modules, wherein the organic light-emitting structures and the fingerprint identification modules are positioned on a display area of the array substrate; each fingerprint identification module is positioned between two adjacent organic light-emitting structures and used for carrying out fingerprint identification according to light rays reflected to the fingerprint identification module by the touch main body; each fingerprint identification module comprises a photodiode and a storage capacitor; along the direction of keeping away from the array substrate, the fingerprint identification module comprises a first electrode, a second electrode and a third electrode; the storage capacitor comprises a first electrode and a second electrode; the photodiode comprises a second electrode, a third electrode and a PN junction positioned between the second electrode and the third electrode; the organic light-emitting structure comprises an anode, a cathode and a light-emitting functional layer positioned between the anode and the cathode along a direction far away from the array substrate; the cathode is electrically connected to the first electrode and the third electrode, respectively.
The skin lines including fingerprints of each person are different from pattern to pattern, break points and cross points, and are unique and invariable throughout the life. Accordingly, a person can be identified by associating his fingerprint with the person, and by comparing his fingerprint with the pre-stored fingerprint data, the person can verify his true identity, which is known as a fingerprint identification technique. Thanks to the electronic integrated manufacturing technology and the fast and reliable algorithm research, the optical fingerprint identification technology in the fingerprint identification technology has started to enter our daily life, and becomes the most deep, widely applied and mature technology in the current biological detection science. The optical fingerprint identification technology has the working principle that light rays emitted by a light source in a display panel irradiate a touch main body (such as a finger), reflected light is formed by the reflection of the finger, the formed reflected light (namely, fingerprint signal light) is transmitted to a fingerprint identification unit, and the fingerprint identification unit collects light signals incident on the fingerprint identification unit. Because the fingerprint has specific lines, reflected light formed at each position of the finger has different intensities, and finally, the fingerprint identification units have different collected light signals, so that the real identity of the user can be determined.
The fingerprint identification module applied in the prior art generally comprises a photodiode and a storage capacitor, wherein the photodiode and the storage capacitor need to be connected into a loop, and the fingerprint identification module comprises a first electrode, a second electrode, a third electrode and a fourth electrode along the direction far away from the array substrate, the first electrode and the second electrode form the storage capacitor, the second electrode and the third electrode form the photodiode, and the third electrode of the photodiode is electrically connected with the first electrode of the storage capacitor through the fourth electrode. Therefore, the fingerprint identification module integrated in the display panel comprises more electrodes, the number of processes of the display panel is increased, and the manufacturing cost of the display panel is improved.
According to the embodiment of the invention, each fingerprint identification module is arranged between two adjacent organic light-emitting structures and used for carrying out fingerprint identification according to the light reflected to the fingerprint identification module by the touch main body, so that the fingerprint identification function of the display panel is realized, and the fingerprint identification module is integrated in the display panel. In addition, each fingerprint identification module in the display panel comprises a photodiode and a storage capacitor, the fingerprint identification module comprises a first electrode, a second electrode and a third electrode along the direction far away from the array substrate, the storage capacitor comprises a first electrode and a second electrode, the photodiode comprises a second electrode and a third electrode, especially, a cathode of an organic light-emitting structure is respectively electrically connected with the first electrode and the third electrode, the third electrode of the photodiode is electrically connected with the first electrode of the storage capacitor by utilizing the cathode of the organic light-emitting structure, so that the photodiode and the storage capacitor form a complete loop, namely, on the premise of ensuring the connection relation between the photodiode and the storage capacitor in the fingerprint identification module, the cathode of the organic light-emitting structure is multiplexed to replace a fourth electrode in the prior art, thus, when the fingerprint identification module is integrated in the display panel for fingerprint identification, the number of processes of the display panel is reduced, and the manufacturing cost of the display panel is reduced.
The above is the core idea of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Fig. 1 is a schematic top view of a display panel according to an embodiment of the present invention, fig. 2 is a schematic cross-sectional view along a direction BB' in fig. 1, and fig. 3 is a schematic circuit structure corresponding to a fingerprint identification module according to an embodiment of the present invention. With reference to fig. 1, 2 and 3, the display panel includes an array substrate 1, the array substrate 1 includes a display area AA and a non-display area NAA surrounding the display area AA, and further includes a plurality of organic light emitting structures 2 and a plurality of fingerprint identification modules 3 located on the display area AA of the array substrate 1, and each fingerprint identification module 3 is located between two adjacent organic light emitting structures 2, and is used for performing fingerprint identification according to light reflected to the fingerprint identification module 3 by the touch main body.
Each fingerprint identification module 3 comprises a photodiode 31 and a storage capacitor 32; in the direction away from the array substrate 1, the fingerprint identification module 3 includes a first electrode 301, a second electrode 302 and a third electrode 303, the storage capacitor 32 includes the first electrode 301 and the second electrode 302, and the photodiode 31 includes the second electrode 302, the third electrode 303 and a PN junction 304 between the second electrode 302 and the third electrode 303. The organic light emitting structure 2 includes an anode 21, a cathode 22, and a light emitting function layer 23 between the anode 21 and the cathode 22 in a direction away from the array substrate 1, and the cathode 22 is electrically connected to the first electrode 301 and the third electrode 303, respectively. Thus, the cathode 22 of the organic light emitting structure 2 is used to electrically connect the third electrode 303 of the photodiode 31 with the first electrode 301 of the storage capacitor 32, so that the photodiode 31 and the storage capacitor 32 in the fingerprint identification module 3 form a complete loop, i.e., the circuit structure shown in fig. 3 is formed, and on the premise of realizing the fingerprint identification function of the display panel, the cathode 22 multiplexed with the organic light emitting structure 2 replaces the fourth electrode in the prior art, thereby reducing the process number of the display panel and lowering the manufacturing cost of the display panel.
It should be noted that a capacitor structure may also be formed between the second electrode 302 and the third electrode 303 of the fingerprint identification module 3, and the function of the capacitor structure is similar to that of the storage capacitor formed between the first electrode 301 and the second electrode 302.
Alternatively, the difference between the first voltage signal on the cathode 22 of the organic light emitting structure 2 and the second voltage signal on the second electrode 302 of the photodiode 31 may be equal to a preset voltage value, and the photodiode 31 is turned on at the preset voltage value. Optionally, with reference to fig. 2 and fig. 3, the display panel may further include a plurality of thin film transistors 5, each thin film transistor 5 is disposed corresponding to one fingerprint identification module 3, each thin film transistor 5 includes a gate 52, a source 53, and a drain 51, and the drain 51 of the thin film transistor 5 is electrically connected to the second electrode 302 of the corresponding photodiode 31, and is configured to provide the second voltage signal to the second electrode 302 of the photodiode 31. Specifically, the photodiode 31 is turned on when the difference between the voltage signals on the second electrode 302 and the third electrode 303 is equal to the predetermined voltage value, and the third electrode 303 of the photodiode 31 is electrically connected to the cathode 22 of the organic light emitting structure 2, so that the photodiode is turned on when the difference between the first voltage signal on the cathode 22 of the organic light emitting structure 2 and the second voltage signal provided by the thin film transistor 5 on the second electrode 302 of the photodiode 31 is equal to the predetermined voltage value. For example, the preset voltage value at which the photodiode 31 can be turned on may be 6.5V, the magnitude of the first voltage signal at the cathode 22 of the organic light emitting structure 2 may be-5V, and the second voltage signal at the second electrode 302 of the photodiode 31 may be 1.5V, when the photodiode 31 is turned on.
Illustratively, as shown in fig. 2, the display panel may further include a plurality of first thin film transistors 7, each first thin film transistor 7 is disposed corresponding to one of the organic light emitting structures 2, each first thin film transistor 7 includes a gate electrode 72, a source electrode 73, and a drain electrode 71, and the drain electrode 71 of the first thin film transistor 7 is electrically connected to the anode 21 of the organic light emitting structure 2 to transmit a data signal to the anode 21 of the organic light emitting structure 2. The organic light emitting structure 2 further includes a light emitting function layer 23 located between the anode 21 and the cathode 22, and the light emitting function layer 23 emits light under the action of the anode 21 and the cathode 22 of the organic light emitting structure 2 to realize the display function of the display panel.
Alternatively, the second electrode 302 of the photodiode 31 may be the anode of the photodiode 31, and the third electrode 303 of the photodiode 31 is the cathode of the photodiode 31; or the second electrode 302 of the photodiode 31 may be the cathode of the photodiode 31, and the third electrode 303 of the photodiode 31 is the anode of the photodiode 31; the PN junction 304 may include a P-type semiconductor and an N-type semiconductor, and the photodiode 31 may further include an intrinsic semiconductor between the P-type semiconductor and the N-type semiconductor. Specifically, when the second electrode 302 of the photodiode 31 is the anode of the photodiode 31 and the third electrode 303 of the photodiode 31 is the cathode of the photodiode 31, the P-type semiconductor between the second electrode 302 and the third electrode 303 is located at a side adjacent to the second electrode 302, and the N-type semiconductor is located at a side adjacent to the third electrode 303. Accordingly, when the second electrode 302 of the photodiode 31 is the cathode of the photodiode 31 and the third electrode 303 of the photodiode 31 is the anode of the photodiode 31, the P-type semiconductor between the second electrode 302 and the third electrode 303 is located at a side adjacent to the third electrode 303 and the N-type semiconductor is located at a side adjacent to the second electrode 302. The photodiode 31 may further include an intrinsic semiconductor located between the P-type semiconductor and the N-type semiconductor, that is, the photodiode 31 may be a PIN junction diode, and through the arrangement of the intrinsic semiconductor located between the P-type semiconductor and the N-type semiconductor, the sensitivity of the photodiode 31 for sensing light is effectively improved, and further, the sensitivity of the display panel for fingerprint identification may be improved.
The principle of fingerprint recognition by the fingerprint recognition module 3 will be described below by taking the second electrode 302 of the photodiode 31 as the negative electrode of the photodiode 31 and the third electrode 303 as the positive electrode of the photodiode 31 as an example.
Illustratively, with reference to fig. 2 and 3, the third electrode 303 of the photodiode 31 is electrically connected to the first electrode 301 of the storage capacitor 32, the drain electrode 51 of the thin film transistor 5 is electrically connected to the second electrode 302, the Gate electrode 52 is electrically connected to the switching control line Gate, and the source electrode 53 is electrically connected to the signal line Data. The photodiode 31 further includes a PN junction 304 between the second electrode 302 and the third electrode 303, the PN junction 304 having a photosensitive characteristic and having a unidirectional conductivity. When the display panel is in a non-illuminated condition, the PN junction 304 has a small saturation reverse leakage current, i.e., a dark current, and the photodiode 31 is turned off. When the display panel is illuminated, the saturation reverse leakage current of the PN junction 304 is greatly increased, resulting in a photocurrent. Because ridge and the millet in the finger fingerprint are different to fingerprint identification module 3's distance for the received reflection light that forms in the position department of ridge and the intensity of the reflection light that forms in the position department of millet of fingerprint identification module 3 are different, and the photocurrent size that converts just also is different, has realized like this that the light that will reflect to fingerprint identification module 3 via the touch main part converts current signal, carries out the discernment of fingerprint.
Specifically, in the fingerprint recognition phase, the node H1 inputs a low voltage signal (e.g., a constant voltage signal having a magnitude of-5V), and the signal line Data inputs a high voltage signal (e.g., a constant voltage signal having a magnitude of 1.5V). The whole fingerprint identification phase can comprise a preparation phase, a fingerprint signal acquisition phase and a fingerprint signal detection phase. In the preparation stage, a driving chip (not shown) electrically connected to the fingerprint identification module 3 controls the thin film transistor 5 to be turned on through the switch control line Gate, and the storage capacitor 32 is charged until the storage capacitor 32 is charged. In the fingerprint identification stage, the thin film transistor 5 is controlled to be closed by using a switch control line Gate; when a user presses the display panel, light emitted by the organic light emitting structure 2 is irradiated to a finger, and is reflected on the surface of the finger to form reflected light, which is irradiated to the fingerprint identification module 3, and the photodiode 31 in the fingerprint identification module 3 receives the reflected light to form a photocurrent, and the direction of the photocurrent is directed to the node H1 from the node H2, so that the potential of H2 changes. In the fingerprint signal detection stage, the potential variation of the node H2 can be directly detected, and the magnitude of the photocurrent is determined, so as to realize the fingerprint identification function of the display panel. In the fingerprint signal detection stage, the thin film transistor 5 may be controlled to be turned on by using a switch control line Gate, a potential difference exists between the first electrode 301 and the second electrode 302 of the storage capacitor 32, the storage capacitor 32 is in a charging state, and the magnitude of the photocurrent is determined by detecting the charge amount charged in the storage capacitor 32, so that the fingerprint identification function of the display panel may also be achieved.
Alternatively, with reference to fig. 1 and fig. 2, the position where the cathode 22 of the organic light emitting structure 2 is electrically connected to the first electrode 301 of the storage capacitor 32 may be located in the non-display area NAA, that is, the cathode 22 of the organic light emitting structure 2 may be electrically connected to the first electrode 301 of the storage capacitor 32 through the third via 641. Alternatively, referring to fig. 1 and 2, the display panel may further include a first insulating layer 61 between the first electrode 301 and the second electrode 302, a second insulating layer 62 between the second electrode 302 and the PN junction 304, and a third insulating layer 63 between the third electrode 303 and the cathode 22. Illustratively, as shown in fig. 4, a fourth insulating layer 64 may be further included between the second insulating layer 62 and the third insulating layer 63. The PN junction 304 is electrically connected to the second electrode 302 through the first via 621 located in the second insulating layer 62, and the cathode 22 is electrically connected to the third electrode 303 through the second via 631 located in the third insulating layer 63. Alternatively, referring to fig. 2 and fig. 3, in order to form a complete circuit between the photodiode 31 and the storage capacitor 32, the third electrode 303 of the photodiode 31 needs to be electrically connected to the first electrode 301 of the storage capacitor 32 through the cathode 22 of the organic light emitting structure 2, and since the first insulating layer 61, the second insulating layer 62, the third insulating layer 63 and the fourth insulating layer 64 are further included between the cathode 22 of the organic light emitting structure 2 and the first electrode 301 of the storage capacitor 32, the cathode 22 of the organic light emitting structure 2 needs to be electrically connected to the first electrode 301 of the storage capacitor 32 through a deep hole, that is, the cathode 22 of the organic light emitting structure 2 can be electrically connected to the first electrode 301 of the storage capacitor 32 through the third via 641 penetrating through the first insulating layer 61, the second insulating layer 62, the third insulating layer 63 and the fourth insulating layer 64.
Alternatively, referring to fig. 1 and 2, the cathode 22 of the organic light emitting structure 2 may be a planar electrode, that is, a uniform voltage signal, that is, a first voltage signal, is provided on the cathode 22 of the organic light emitting structure 2. Optionally, the first electrode 301 of each fingerprint identification module 3 may be connected. Illustratively, since the cathode 22 of the organic light emitting structure 2 has a uniform first voltage signal thereon, and the cathode 22 of the organic light emitting structure 2 is electrically connected to the first electrode 301 of each fingerprint identification module 3, the voltage on the first electrode 301 of each fingerprint identification module 3 is the same. The first electrodes 301 in each fingerprint identification module 3 are connected, so that the same potential on the first electrodes 301 of each fingerprint identification module 3 can be ensured. On the other hand, the cathode 22 of the organic light emitting structure 2 described in the previous paragraph can be electrically connected to the first electrode 301 in the non-display area NAA through the deeper third via hole 641, that is, the cathode 22 of the organic light emitting structure 2 is electrically connected to the first electrodes 301 in all the fingerprint identification modules 3.
Specifically, because deep hole technology needs to occupy the region of bigger area among the display panel for shallow hole technology, can the area that fingerprint identification module 3 occupied display panel reduce to a certain extent, influence display panel fingerprint identification's detection precision. In addition, the deep hole process also limits the organic light emitting structure 2 around the fingerprint identification module 3, i.e. the increase of the pixel unit area, and limits the increase of the aperture opening ratio of the display panel. The position that cathode 22 that sets up organic light emitting structure 2 and storage capacitor 32's first electrode 301 electricity are connected like this is located non-display area NAA, effectively avoided being connected in order to realize organic light emitting structure 2's cathode 22 and storage capacitor 32's first electrode 301 electricity at display panel's display area AA deep hole, increased the area that is located display panel's display area AA's fingerprint identification module 3 or organic light emitting structure 2 to a certain extent, effectively improved display panel's aperture ratio, the display panel has improved the detection precision that carries out fingerprint identification.
Illustratively, the third insulating layer 63 may include a pixel defining layer. In particular, the display panel may include a plurality of organic light emitting structures arranged in a matrixAnd 2, a pixel defining layer is arranged between every two adjacent organic light emitting structures 2, so that each organic light emitting structure 2 forms an independent pixel structure. Illustratively, the first, second, and third insulating layers 61, 62, and 63 may include SiNxA material. Specifically, the first insulating layer 61 may insulate the first electrode 301 of the storage capacitor 32 and the second electrode 302 of the photodiode 31 from each other, the second insulating layer 62 may insulate the second electrode 302 and the third electrode 303 of the photodiode 31 from each other, and the third insulating layer 63 may insulate the third electrode 303 of the photodiode 31 and the cathode 22 of the organic light emitting structure 2 from each other.
Alternatively, the material constituting the photodiode 31 may include an amorphous silicon material. Illustratively, the photodiode 31 may include a P-type semiconductor obtained by doping a group VI element in an amorphous silicon material, an N-type semiconductor obtained by doping a group III element in an amorphous silicon material, and an intrinsic semiconductor located between the P-type semiconductor and the N-type semiconductor, which may be directly made of the amorphous silicon material. The photodiode 31 formed of amorphous silicon material has high conductivity, and can effectively improve the detection accuracy of the display panel for fingerprint identification.
Optionally, fig. 4 is a schematic diagram of a working principle of the fingerprint identification module according to the embodiment of the present invention. As shown in fig. 4, organic light emitting structure 2 can provide the light source for fingerprint identification module 3, and fingerprint identification module 3 can reflect fingerprint identification module 3 in order to carry out fingerprint identification through touching the main part according to the light that organic light emitting structure 2 sent. Specifically, the light that organic light emitting structure 2 sent reflects to fingerprint identification module 3 behind touch subject 4, because touch subject 4, people's fingerprint has ridge 41 and valley 42 promptly, and ridge 41 and valley 42 are different to organic light emitting structure 2's distance, it is different to form reflected light intensity in ridge 41 and valley 42 each position department of touch subject 4, finally make the light signal that each fingerprint identification module 3 gathered different, and then realize the fingerprint identification function, can confirm the true identity of user in view of the above.
Optionally, fig. 5 is a schematic diagram of another fingerprint identification module for performing fingerprint identification according to an embodiment of the present invention. As shown in fig. 5, fingerprint identification module 3 can also include fingerprint identification light source 8, and fingerprint identification light source 8 is located the one side that fingerprint identification module 3 was kept away from to array substrate 1, and fingerprint identification module 3 can reflect fingerprint identification module 3 in order to carry out fingerprint identification via touch main part 4 according to the light that fingerprint identification light source 8 sent, and its principle of carrying out fingerprint identification is similar with the fingerprint identification principle when organic light emitting structure 2 regarded as the light source, and it is no longer repeated here.
The fingerprint recognition light source 8 may be, for example, a collimated light source or a surface light source. Compare with using the area source, use collimated light source to weaken the crosstalking between different fingerprint identification modules 3 of light that forms through user's finger fingerprint reflection, improve fingerprint identification's precision. However, since the collimated light source tends to be thicker than the area light source, the use of the collimated light source increases the thickness of the display panel.
In the embodiment of the invention, the display panel comprises a plurality of organic light emitting structures 2 and a plurality of fingerprint identification modules 3 which are positioned on the display area AA of the array substrate 1, each fingerprint identification module 3 comprises a photodiode 31 and a storage capacitor 32, the fingerprint identification module 3 comprises a first electrode 301, a second electrode 302 and a third electrode 303 along the direction far away from the array substrate 1, the storage capacitor 32 comprises a first electrode 301 and a second electrode 302, the photodiode 31 comprises a second electrode 302 and a third electrode 303, particularly, the cathode 22 of the organic light emitting structure 2 is respectively electrically connected with the first electrode 301 and the third electrode 303, the cathode 22 of the organic light emitting structure 2 is utilized to realize the electrical connection between the third electrode 303 of the photodiode 31 and the first electrode 301 of the storage capacitor 32, namely, on the premise of ensuring the connection relationship between the photodiode 31 and the storage capacitor 32 in the fingerprint identification module 3, the cathode 22 of the organic light emitting structure 2 is used for replacing a fourth electrode in the prior art, so that the fingerprint identification module 3 is integrated in the display panel for fingerprint identification, the process number of the display panel is reduced, and the manufacturing cost of the display panel is reduced.
Fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 6, the display device 100 includes the display panel 101 in the above embodiments, so that the display device 100 provided in the embodiment of the present invention also has the beneficial effects described in the above embodiments, and further description is omitted here.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (15)
1. A display panel, comprising:
the array substrate comprises a display area and a non-display area surrounding the display area;
the array substrate comprises a plurality of organic light-emitting structures and a plurality of fingerprint identification modules, wherein the plurality of organic light-emitting structures and the plurality of fingerprint identification modules are positioned on a display area of the array substrate;
each fingerprint identification module is positioned between two adjacent organic light-emitting structures and used for carrying out fingerprint identification according to light rays reflected to the fingerprint identification module through the touch main body;
each fingerprint identification module comprises a photodiode and a storage capacitor; along the direction far away from the array substrate, the fingerprint identification module comprises a first electrode, a second electrode and a third electrode; the storage capacitor comprises the first electrode and the second electrode; the photodiode includes the second electrode, the third electrode, and a PN junction between the second electrode and the third electrode;
the organic light-emitting structure comprises an anode, a cathode and a light-emitting functional layer positioned between the anode and the cathode along a direction far away from the array substrate; the cathode is electrically connected with the first electrode and the third electrode respectively;
and the position where the cathode of the organic light-emitting structure is electrically connected with the first electrode of the storage capacitor is positioned in the non-display area.
2. The display panel of claim 1, wherein a difference between a first voltage signal on the cathode of the organic light emitting structure and a second voltage signal on the second electrode of the photodiode is equal to a preset voltage value at which the photodiode is turned on.
3. The display panel according to claim 2, further comprising:
and each thin film transistor is arranged corresponding to one fingerprint identification module, and the drain electrode of each thin film transistor is electrically connected with the second electrode of the corresponding photodiode and used for providing the second voltage signal for the second electrode of the photodiode.
4. The display panel according to claim 1, wherein the second electrode of the photodiode is an anode of the photodiode, and the third electrode of the photodiode is a cathode of the photodiode; or the second electrode of the photodiode is the cathode of the photodiode, and the third electrode of the photodiode is the anode of the photodiode;
the PN junction comprises a P-type semiconductor and an N-type semiconductor, and the photodiode further comprises an intrinsic semiconductor positioned between the P-type semiconductor and the N-type semiconductor.
5. The display panel according to claim 1, further comprising:
a first insulating layer between the first electrode and the second electrode;
the second insulating layer is positioned between the second electrode and the PN junction, and the PN junction is electrically connected with the second electrode through a first through hole positioned in the second insulating layer;
and the cathode is electrically connected with the third electrode through a second through hole in the third insulating layer.
6. The display panel according to claim 5, wherein the cathode of the organic light emitting structure is electrically connected to the first electrode of the storage capacitor through a third via hole penetrating the first insulating layer, the second insulating layer, and the third insulating layer.
7. The display panel according to claim 5, wherein the third insulating layer comprises a pixel defining layer.
8. The display panel according to claim 5, wherein the first insulating layer, the second insulating layer, and the third insulating layer comprise SiNxA material.
9. The display panel of claim 1, wherein the first electrode of each of the fingerprint recognition modules is connected.
10. The display panel of claim 1, wherein the cathode of the organic light emitting structure is a planar electrode.
11. The display panel according to claim 1, wherein a material constituting the photodiode comprises an amorphous silicon material.
12. The display panel of claim 1, wherein the organic light emitting structure provides a light source for the fingerprint identification module, and the fingerprint identification module is configured to reflect light emitted by the organic light emitting structure to the fingerprint identification module via the touch body for fingerprint identification.
13. The display panel of claim 1, wherein the fingerprint identification module further comprises a fingerprint identification light source located on a side of the array substrate away from the fingerprint identification module; the fingerprint identification module is used for according to the light that the fingerprint identification light source sent is via the touch main part reflects the fingerprint identification module is in order to carry out fingerprint identification.
14. The display panel of claim 13, wherein the fingerprint recognition light source is a collimated light source or a surface light source.
15. A display device comprising the display panel according to any one of claims 1 to 14.
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| US11847850B2 (en) | 2021-06-07 | 2023-12-19 | Wuhan China Star Optoelectronics Technology Co., Ltd. | Array substrate, manufacturing method thereof, and display device |
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