CN108258024B - Display panel and display device - Google Patents
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- CN108258024B CN108258024B CN201810083618.7A CN201810083618A CN108258024B CN 108258024 B CN108258024 B CN 108258024B CN 201810083618 A CN201810083618 A CN 201810083618A CN 108258024 B CN108258024 B CN 108258024B
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- 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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- G—PHYSICS
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- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
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- 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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- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
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Abstract
The invention discloses a display panel and a display device. A display panel, comprising: the light-emitting device comprises an array layer, a light-emitting device layer and a light-sensing device; the array layer is positioned on one side of the light-emitting device layer, which is far away from the display surface of the display panel; the light-emitting device layer comprises a plurality of organic light-emitting devices, each organic light-emitting device comprises an anode, a light-emitting layer and a cathode, and the film layer where the cathode is located is the cathode layer; the light sensing device comprises a plurality of sensing units, and the sensing units are positioned on one side of the cathode layer, which is far away from the display surface of the display panel; the display area of the display panel comprises a luminous area and a non-luminous area, wherein the cathode layer is provided with a plurality of openings, the openings are positioned in the non-luminous area, and the orthographic projection of the sensing unit on the cathode layer is at least partially positioned in the openings. The invention improves the light penetration rate of fingerprint identification detection, thereby increasing the light quantity received by the sensing unit and further improving the accuracy of fingerprint identification detection.
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
With the development of science and technology, a variety of display devices with fingerprint identification functions appear in the market, such as mobile phones, tablet computers, intelligent wearable devices and the like. The fingerprint is unique for every person, and the safety factor of the display device can be improved by adopting the fingerprint identification function. When a user operates the display device with the fingerprint identification function, the user can touch the fingerprint identification sensor of the display device with a finger to carry out authority verification, and the authority verification process is simplified.
The existing fingerprint identification technology is divided into an externally-hung type and an embedded type according to the setting position of a fingerprint identification sensing unit, the externally-hung type refers to the fingerprint identification function of the display panel which is realized by the fact that the fingerprint identification sensing unit is attached to the display panel after being manufactured independently, and the embedded type refers to the fact that the fingerprint identification sensing unit is manufactured in the film structure of the display panel. Fingerprint recognition is typically accomplished by detecting light reflected to the fingerprint recognition unit via a touching body (e.g., a finger), i.e., determining the ridges and valleys of a fingerprint. The current fingerprint identification technology identifies fingerprints by detecting the intensity difference of reflected light of fingerprint ridges and valleys. The light volume that fingerprint identification induction element received is big, and then the fingerprint identification accuracy is high, and the light volume that fingerprint identification induction element received is few, then the fingerprint identification accuracy is low.
Therefore, it is an urgent need to provide a display panel and a display device that increase the amount of light received by the fingerprint sensing unit and improve the fingerprint accuracy.
Disclosure of Invention
In view of the above, the present invention provides a display panel and a display device, which solve the technical problem of improving the accuracy of fingerprint identification.
In order to solve the above technical problem, the present invention provides a display panel, including: the light-emitting device comprises an array layer, a light-emitting device layer and a light-sensing device;
the array layer is positioned on one side of the light-emitting device layer, which is far away from the display surface of the display panel;
the light-emitting device layer comprises a plurality of organic light-emitting devices, each organic light-emitting device comprises an anode, a light-emitting layer and a cathode, and the film layer where the cathode is located is the cathode layer;
the light sensing device comprises a plurality of sensing units, and the sensing units are positioned on one side of the cathode layer, which is far away from the display surface of the display panel;
the display area of the display panel comprises a luminous area and a non-luminous area, wherein the cathode layer is provided with a plurality of openings, the openings are positioned in the non-luminous area, and the orthographic projection of the sensing unit on the cathode layer is at least partially positioned in the openings.
In a second aspect, in order to solve the above technical problem, the present invention provides a display device including any one of the display panels.
Compared with the prior art, the display panel and the display device provided by the invention have the beneficial effects that:
in the layer structure of the display panel provided by the invention, the sensing unit is arranged on one side of the cathode layer far away from the display surface of the display panel, in the fingerprint identification stage, light reflected by the touch main body can penetrate through the film layer where the cathode is arranged to irradiate the sensing unit, the cathode layer is provided with the opening, and the orthographic projection of the sensing unit on the cathode layer is at least partially positioned in the opening, so that at least part of the light reflected by the touch main body can penetrate through the opening to irradiate the sensing unit, the light loss is avoided when the light penetrates through the cathode layer (although the cathode layer is made of a light-transmitting material, the light loss is inevitably caused when the light penetrates through the dielectric layer), the light penetration rate of fingerprint identification detection is improved, the light quantity received by the sensing unit is increased, and the fingerprint identification detection precision is improved.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, 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 diagram of a film structure of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic top view of a display panel according to an embodiment of the present invention;
fig. 3 is a diagram illustrating a film structure of an alternative embodiment of a display panel according to an embodiment of the present invention;
fig. 4 is a film structure diagram of another alternative embodiment of a display panel according to an embodiment of the present invention;
FIG. 5 is a schematic top view of an alternative embodiment of a display panel according to an embodiment of the invention;
FIG. 6 is a schematic top view of another alternative embodiment of a display panel according to an embodiment of the present invention;
FIG. 7 is a schematic top view of an alternative embodiment of a light sensor in a display panel according to an embodiment of the present invention;
FIG. 8 is a schematic top view of another alternative embodiment of a display panel according to an embodiment of the present invention;
FIG. 9 is a schematic top view of another alternative embodiment of a display panel according to an embodiment of the present invention;
fig. 10 is a film structure diagram of an array layer of a display panel according to an embodiment of the invention;
fig. 11 is a schematic view of a display device according to an embodiment of the invention.
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 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 merely illustrative, and not 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 view of a film structure of a display panel according to an embodiment of the present invention, and fig. 2 is a schematic top view of the display panel according to the embodiment of the present invention.
Referring to fig. 1 and 2 together, the display panel includes: an array layer 101, a light emitting device layer 102, and a light sensing device 103; the array layer 101 is located on a side of the light-emitting device layer 102 away from a display surface M of the display panel, where the display surface M is a surface on which the display panel can display a screen, and is also a surface of the display panel that can be touched by a touch subject during the fingerprint recognition. The array layer 101 is generally a multi-film layer stacked structure, and includes a plurality of thin film transistors T, which include an active layer T1, a source T2, a drain T3, and a gate T4, and is only exemplarily shown in fig. 1 as a thin film transistor with a top gate structure, it should be noted that the thin film transistor in the present invention may also be a bottom gate structure; the light emitting device layer 102 includes a plurality of organic light emitting devices 1021, the organic light emitting devices 1021 include an anode 10211, a light emitting layer 10212, and a cathode 10213, and the cathode layer 104 is a film layer where the cathode 10213 is located. The anode 10211 is electrically connected to the source T2 or the drain T3 of the thin film transistor T, and fig. 1 schematically shows that the anode 10211 is electrically connected to the drain T3 of the thin film transistor T. Alternatively, the anodes 10211 of the respective organic light emitting devices 1021 are insulated from each other, and the cathodes 10213 of the respective organic light emitting devices 1021 are electrically connected to each other. The display panel further includes a light sensing device 103, where the light sensing device 103 includes a plurality of sensing units S, and the sensing units S are located on a side of the cathode layer 104 away from the display surface M of the display panel. It should be noted that, in order to realize fingerprint identification detection, the circuit structure of the light sensing device may include not only the sensing unit, but also other structures such as a thin film transistor for controlling the on/off of the sensing unit, which are not shown in fig. 1.
As shown in fig. 2, the display region of the display panel includes a light-emitting region G and a non-light-emitting region FG, the light-emitting region G is a region of the display panel corresponding to the light-emitting layer 10212 and the anode 10211, the non-light-emitting region FG surrounds the light-emitting region G, and the display panel is divided into a plurality of sub-pixels corresponding to the non-light-emitting region FG, and one sub-pixel includes one light-emitting region G. In order to ensure the utilization rate of light when the display panel displays, in the top emission organic light emitting device, the anode 10211 is usually made of a metal reflective material, the anode is opaque, and the cathode 10213 is made of a transparent material, so as to ensure the transmittance of light. In the present invention, the cathode layer 104 has a plurality of openings K, the openings K are located in the non-light-emitting region FG, and the orthographic projection of the sensing unit S on the cathode layer 104 is at least partially located in the openings K. The orthographic projection of the sensing element S on the cathode layer 104 may be partially located in the opening K, or the orthographic projection of the sensing element S on the cathode layer 104 may be entirely located in the opening.
In the fingerprint recognition stage, the organic light emitting device 1021 may serve as a light source for fingerprint recognition sensing, light emitted from the organic light emitting device 1021 is reflected by the touch subject Z (for example, a finger) and then irradiates the sensing unit S, and then the sensing unit S determines ridges and valleys of the fingerprint by receiving intensity of the light to complete fingerprint recognition. In the layer structure of the display panel provided by the invention, the sensing unit S is arranged on the side of the cathode layer 104 far away from the display surface M of the display panel, light reflected by the touch main body Z can pass through the film layer where the cathode is located to irradiate the sensing unit S in a fingerprint identification stage, the cathode layer 104 is provided with the opening K, and the orthographic projection of the sensing unit S on the cathode layer 104 is at least partially positioned in the opening K, so that at least part of the light reflected by the touch main body Z can pass through the opening K to irradiate the sensing unit S, the light loss generated when the light penetrates through the cathode layer 104 is avoided, the light penetration rate is improved, the light quantity received by the sensing unit S is increased, and the fingerprint identification detection precision is improved. Meanwhile, in the present invention, the opening K formed in the cathode layer 104 is located in the non-light emitting region FG, so that each organic light emitting device 1021 is not affected by the opening K during operation and can still emit light and display normally in the display stage.
In the invention, the holes arranged on the cathode layer can be uniformly distributed on the cathode layer, when the display panel is in a display stage, light emitted by the light emitting layer penetrates through the cathode layer and is displayed on the display surface of the display panel, when the position opposite to the holes in the display area is displayed, the light is not penetrated through the medium of the cathode layer, the light loss is relatively less, the brightness is relatively high, and the brightness difference between the position opposite to the holes in the display area and other positions in the display panel can exist during the display. The holes are uniformly distributed on the cathode layer, so that the uniformity of the finishing brightness of the display panel during display can be ensured, and the display effect is improved.
It should be noted that the specific positions of the light sensing devices 103 in the film structure of the display panel in the present invention include various situations, and fig. 1 only schematically shows that the sensing units S are located on the side of the cathode layer 104 away from the display surface M. In fig. 2, the shapes and the arrangements of the light emitting areas G, the sizes of the openings K and the positions of the openings between two adjacent light emitting areas G are schematically shown, and are not intended to limit the present invention, and the sizes and the positions of the openings K are actually designed according to the sizes of the sensing units, so as to ensure that light received by the sensing unit S passes through the inside of the openings K and irradiates the sensing unit. An encapsulation structure may be further disposed above the light emitting device layer 102 in the present invention to block water and oxygen from invading the organic light emitting device 1021. The package structure may be a thin film package or a rigid package, and the thin film package may be a combined package of multiple layers of organic thin films and inorganic thin films, for example, an alternate stacked structure of organic thin films and inorganic thin films. The organic film can be polymer materials such as epoxy, phenolic, polyester and the like; the inorganic thin film may be made of silicon nitride, silicon oxynitride, metal oxide, or the like. And the rigid package may be a glass package. Other structural layers such as a polarizer or a protective layer can be arranged above the packaging structure.
In the present invention, a plurality of sub-pixels are included in the display panel, and the thin film transistors in the array layer serve as switching devices for the sub-pixels, wherein one of the sub-pixels includes one organic light emitting device 1021. The organic light emitting device may be a top emission type structure or a bottom emission type structure, and the top emission type structure is illustrated in fig. 1 only as an example. In this structure, the anode 10211 is a reflective electrode, usually made of metal material, and can be made of Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, or their mixture; for example, anode 10211 can comprise a structure of ITO-Ag-ITO (i.e., indium tin oxide-silver-indium tin oxide); the light emitting layer 10212 may include a red light emitting layer, a green light emitting layer, and a blue light emitting layer, but the present invention is not limited thereto; the cathode 10213 is a transparent electrode, and may include Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), zinc oxide (ZnO) or indium oxide (In)2O3) And the like; the anode can effectively reflect light emitted from the light emitting layer 10212 to a light emitting side to improve light emitting efficiency, and holes injected from the anode and electrons injected from the cathode are combined in the light emitting pixel layer to generate excitons, which fall from an excited state to a ground state and generate light. The light emitting device 1021 may further include one or more of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, and an electron injection layer. A hole injection layer and/or a hole transport layer may be disposed between the anode 10211 and the light emitting layer 10212. An electron injection layer and/or an electron transport layer may be disposed between the cathode 10213 and the light emitting layer 10212.
In some alternative embodiments, fig. 3 is a film structure diagram of an alternative embodiment of a display panel according to an embodiment of the present invention. Fig. 3 still schematically shows the position of the sensing unit in the film structure of the display panel. As shown in fig. 3, the sensing elements S are located on the side of the cathode layer 104 away from the display surface M, and the orthographic projection of the sensing elements S on the cathode layer 104 coincides with the openings K. The specific meanings of the reference numerals in fig. 3 can be explained with reference to the embodiment of fig. 1. In this embodiment, sensing element S is located cathode layer 104 and keeps away from display surface M one side, set up trompil K at cathode layer 104, sensing element S coincides with trompil K at cathode layer 104' S orthographic projection, at the fingerprint identification stage, can guarantee all light of sensing element S received through the reflection of touch main part, all pass trompil K and shine on sensing element S, all light that are used for fingerprint detection have all been avoided penetrating cathode layer 104 and produce certain light loss, the light quantity that sensing element S received has further been increased, and then the accuracy that fingerprint identification detected has been improved. This embodiment is an optional case, and relates to the size relationship between the opening K and the sensing unit, and if the orthographic projection part of the sensing unit S on the cathode layer 104 coincides with the opening K, the transmittance of the part of the light rays received by the sensing unit S for fingerprint identification is improved compared with the case where the opening K is not provided on the cathode layer, thereby increasing the amount of light received by the sensing unit S; if the size of the opening K is properly increased under the above conditions, the orthographic projection of the sensing unit S on the cathode layer 104 is overlapped with the opening K, so that the light can be ensured to pass through the opening K and then irradiate the sensing unit, and the light loss of the light for fingerprint identification detection when passing through the cathode layer is reduced to the maximum extent; if the size of the opening K is continuously increased under the above-mentioned circumstances, the orthographic projection of the sensing unit S on the cathode layer 104 is located in the opening K, in this circumstance, although the light loss when the light for fingerprint identification detection passes through the cathode layer can be reduced to the maximum extent, in this circumstance, the larger opening K is arranged at the position corresponding to the non-light-emitting region on the cathode layer, when the light emitted by the light-emitting region is emitted to the display surface of the display panel in the display stage of the display panel, the film layers penetrated by the light emitted from the opening position and the non-opening position in the display region are different, resulting in different penetration rates, and further, there is a difference in brightness on the display, the larger the opening K, the more the difference is, the more the display effect is affected, in practice, the opening of the cathode layer is arranged to increase the amount of fingerprint identification light received by the sensing unit, and further, when the accuracy of fingerprint identification detection is improved, when the size and the position of the opening are designed, the influence of the open holes on the display can be considered at the same time, and the display uniformity is ensured.
The specific position of the light sensing device in the film layer structure of the display panel comprises various conditions. The light sense device can be of an externally hung type, namely the light sense device is attached to a display module in the display panel after being integrally manufactured, so that the fingerprint identification function of the display panel is realized. Or the light sensing device can be embedded, namely the light sensing device is manufactured together with the original film structure of the display panel, and the light sensing device can also be manufactured in the original film structure of the display panel. The following examples will illustrate alternative placement locations for the light sensing devices of the present invention.
In an alternative implementation manner, fig. 4 is a film layer structure diagram of another alternative implementation manner of the display panel provided in the embodiment of the present invention. As shown in fig. 4, the display panel includes: the light-emitting device comprises an array layer 101, a light-emitting device layer 102 and a light-sensing device 103, wherein the light-sensing device 103 comprises a plurality of sensing units S; the array layer 101 is located on the side of the light emitting device layer 102 away from the display surface M of the display panel. The organic light emitting device 1021 includes an anode, a light emitting layer, and a cathode, and the film layer where the cathode is located is the cathode layer 104. The sensing units S are located on a side of the array layer 101 away from the light emitting device layer 102, the cathode layer 104 has a plurality of openings K, and an orthographic projection of the sensing units S on the cathode layer 104 is at least partially located in the openings K. This embodiment can realize the display panel that outer hanging fingerprint identification of preparation detected, counterpoint the laminating with display panel' S array layer after accomplishing the whole preparation of light sense device rete during the display panel preparation, counterpoint the laminating and make the induction element partly be located the trompil in at least the orthographic projection of cathode layer or induction element coincide with the trompil at the orthographic projection of cathode layer, the fingerprint identification stage has been guaranteed, the light of through touch main part Z reflection can see through trompil K, pass array layer 101 again, shine at last and realize fingerprint identification and detect on the induction element S. In the embodiment, the light loss of the light for fingerprint identification detection when the light penetrates the cathode layer is reduced, which is equivalent to increasing the light quantity of the light for fingerprint identification detection, and the accuracy of fingerprint identification is improved.
Furthermore, the display panel comprises a plurality of signal lines, and the signal lines are wired in the non-light-emitting area. The signal lines may be gate lines or data lines for providing signals for display of the display panel, and when the display panel has a touch function, the signal lines may also be touch signal lines connected to the touch electrodes. For the externally-hung fingerprint identification and detection display panel, light reflected by the touch main body can reach the sensing unit only by penetrating the array layer, and signal lines in the display panel are usually arranged in the array layer for wiring. Therefore, for the externally-hung fingerprint identification detection display panel, the holes formed in the cathode layer can be specially designed, for example, the holes can be designed to avoid signal lines in the display panel when the holes are formed for relatively simple process, that is, the holes expose part of the signal lines in the display panel, or the holes are designed not to expose the signal lines in the display panel for ensuring that the area of the holes is small in the display panel.
Optionally, the orthographic projection part of the signal line on the cathode layer is located in the opening, that is, the opening of the cathode layer exposes part of the signal line in the display panel.
Fig. 5 is a schematic top view of an alternative embodiment of the display panel according to the embodiment of the present invention, as shown in fig. 5, an opening K is disposed in the cathode layer 104, the display panel includes a light-emitting area G and a non-light-emitting area FG, the non-light-emitting area FG surrounds the light-emitting area G, and the opening K is located in the non-light-emitting area FG. The shape, size and position of the opening K in fig. 5 are not exclusive, and in fig. 5, the opening K in the cathode layer 104 exposes a portion of the signal line X. The signal line is usually made of a metal material, and the metal material has a very low transmittance to light. In the fingerprint identification stage, the light reflected by the touch main body cannot penetrate through the sensing unit if the light irradiates the signal line, and part of the light reflected by the touch main body can penetrate through the white filling area in fig. 5 and irradiate the sensing unit, so that fingerprint identification detection is realized. In this embodiment, the signal line is located in the opening at the orthographic projection part of the cathode layer, that is, the opening arranged on the cathode layer exposes part of the signal line, and the position of the signal line does not need to be avoided when the opening on the cathode layer is manufactured, and the corresponding relation between the opening position and the sensing unit can be only considered, so that the manufacturing process is relatively simple.
Optionally, the orthographic projection of the signal line on the cathode layer is not overlapped with the opening. In the fingerprint identification stage, the light reflected by the touch main body can only pass through the pure white filling area (the area without metal wires in the display panel) in fig. 5 to reach the sensing unit, and the light reflected by the touch main body cannot pass through the signal line (the metal wire routing area) to reach the sensing unit because the transmittance of the metal material to the light is extremely low. In this embodiment, the orthographic projection of the signal line at the cathode layer 104 is not coincident with the opening K, that is, only the pure white filling area in fig. 5 is exposed on the cathode layer 104 to set the opening K, and the light reflected by the touch main body passes through the opening K to irradiate the sensing unit, so that the light loss caused by the light penetrating through the cathode layer 104 is reduced, the light penetration rate for fingerprint identification detection is improved, and the precision of fingerprint identification detection is improved. When the display panel is in a display stage, light emitted by the light emitting layer penetrates through the cathode layer and then is displayed on the display surface of the display panel, when the opening facing position in the display area is in display, the light is not penetrated through the medium of the cathode layer, light loss is relatively small, brightness is relatively high, and brightness difference possibly exists between the opening facing position in the display area and other positions in the display panel when the opening facing position in the display area is in display. When the cathode layer is provided with the opening and does not expose the signal line in the embodiment, the area of a single opening of the cathode layer is smaller, the whole area of the opening in the display panel is smaller, the area of a bright area corresponding to the opening position in the display panel is smaller, and the brightness difference in the display panel is reduced.
Fig. 6 is a schematic top view of another alternative embodiment of a display panel according to an embodiment of the present invention, as shown in fig. 6, the display panel includes a plurality of gate lines 105 extending along a first direction a and a plurality of data lines 106 extending along a second direction b, both the first direction a and the second direction b are parallel to a panel surface of the display panel, and the first direction a and the second direction b intersect; optionally, the signal lines in the above embodiments include the gate lines 105 and/or the data lines 106. The gate line 105 provides a gate scan signal to a sub-pixel (i.e., an organic light emitting device) in the display panel, the data line 106 provides a data signal to a sub-pixel in the display panel, and the gate line 105 and the data line 106 are usually made of a metal material and need to be routed in a non-light emitting region in order not to affect the light emitting display of the display panel. In the present invention, the cathode layer is provided with an opening, the opening is located in the non-light-emitting region, and the position of the opening can expose a part of the gate line 105 or the data line 106, or the opening avoids the gate line 105 and the data line 106 when the cathode layer is provided with the opening.
In another alternative embodiment, the sensing unit is located on a side of the array layer adjacent to the light emitting device layer. The light sensing device can be located between the array layer and the light emitting device layer, or some film layers in the light emitting device are multiplexed when the light sensing device is manufactured.
Optionally, fig. 7 is a schematic top view of an alternative implementation of the light sensing device in the display panel according to the embodiment of the present invention. As shown in fig. 7, the sensing unit S includes a first electrode 1031, a photosensitive layer 1032 and a second electrode 1033 arranged in sequence, the light sensing device further includes a light sensing device thin film transistor T ', the first electrode 1031 is electrically connected to a first end D1 of the light sensing device thin film transistor T', the light sensing device thin film transistor T 'includes an active layer, a source electrode, a drain electrode and a gate electrode, the first end D1 may be the source electrode or the drain electrode, and the specific case is related to the conductive channel region of the light sensing device thin film transistor T' being an N-type or P-type half. For example, when the drain voltage is greater than the source voltage, the first terminal D1 may be the drain of the light sensing device thin film transistor T'. Photosensitive layer 1032 may be a PIN junction, or may be other structures capable of converting an optical signal into an electrical signal. The first electrode 1031, the photosensitive layer 1032 and the second electrode 1033 constitute a photodiode, the first electrode 1031 can be used as an anode of the photodiode and can be made of a metal material, the second electrode 1033 can be used as a cathode of the photodiode and is made of a transparent conductor material, for example, indium tin oxide, light reflected by a touch main body irradiates the photodiode, the photodiode converts the light into a photocurrent signal, the first electrode 1031 is electrically connected with the first end D1 of the light-sensing device thin film transistor T', and when the light-sensing device thin film transistor is in an on state, the photocurrent signal is transmitted through the first end D1, so that a fingerprint identification detection function is realized.
Further, fig. 8 is a schematic top view of another alternative implementation of the display panel according to the embodiment of the present invention. As shown in fig. 8, the photo-sensor device thin film transistor T' is located on the array layer 101; the first electrode 1031 is electrically connected to the first end D1 of the thin film transistor T' of the photo-sensing device through the connection electrode 10311, and the connection electrode 10311 and the anode 10211 are located on the same film layer. The cathode layer 104 is provided with openings K. The orthographic projection of the sensing unit S on the cathode layer 104 is at least partially located in the opening K. The orthographic projection of the sensing unit S on the cathode layer 104 may be partially located in the opening K, or the orthographic projection of the sensing unit S on the cathode layer 104 is entirely located in the opening as shown in fig. 8. In this embodiment, at the fingerprint identification stage, can guarantee that sensing element S received at least part through the light of touch main part reflection, pass trompil K and shine on the sensing element for the light of fingerprint detection can avoid penetrating cathode layer 104 and produce certain light loss, has increased the light quantity that sensing element S received in other words, and then has improved the precision that fingerprint identification detected. In this embodiment, the thin film transistor T' of the light sensing device is located in the array layer 101, and can be manufactured together with the thin film transistor T for controlling the organic light emitting device in the array layer 101 during manufacturing, thereby saving the manufacturing process and improving the production efficiency. In the invention, through holes penetrating through a plurality of film layers need to be manufactured when the first electrode 1031 is electrically connected with the first end D1 of the light sensing device thin film transistor T ', the connection electrode 10311 manufactured on the film layer where the anode is located is connected with the first electrode 1031 and the first end D1 of the light sensing device thin film transistor T ', so that good conduction performance between the first electrode 1031 and the first end of the light sensing device thin film transistor T ' can be ensured, meanwhile, the connection electrode 10311 can be manufactured in the same etching process with the anode 10211 of the light emitting device, and no new process is added. In addition, in the embodiment, the light sensing device is manufactured by multiplexing the original structural film layer of the display panel, so that the thickness of the display panel is not increased while the fingerprint identification and detection function of the display panel is realized, and the requirement of thinning the display panel is met. In addition, in the embedded fingerprint identification scheme, when the sensing unit S is located on the side of the cathode layer 104 away from the display surface of the display panel, a coupling capacitor exists between the second electrode 1033 of the sensing unit S and the cathode layer 104 opposite thereto, and the coupling capacitor may affect a cathode electrical signal in the display device and also affect a fingerprint identification electrical signal in the sensing unit S. In the embodiment of the present invention, the cathode layer 104 is provided with the opening K, the orthographic projection of the sensing unit S on the cathode layer 104 is at least partially located in the opening K, and optionally, the orthographic projection of the sensing unit S on the cathode layer 104 is entirely located in the opening K, which is equivalent to removing the cathode layer 104 over the sensing unit S, so that the coupling capacitance between the sensing unit S and the cathode layer 104 is reduced, the signal crosstalk between the cathode layer and the sensing unit can be prevented, and the display effect and the accuracy of fingerprint identification detection are improved.
Further, fig. 9 is a schematic top view of another alternative implementation of the display panel according to the embodiment of the present invention. As shown in fig. 9, the photo-sensing device further includes a common electrode 1034, and the common electrode 1034 is electrically connected to the second electrode 1033. The cathode layer 104 is provided with openings K. The specific meanings of the reference numerals in fig. 9 can be explained with reference to the corresponding embodiment of fig. 8. In this embodiment, the cathode layer 104 is provided with an opening K, and the orthographic projection of the sensing unit S on the cathode layer 104 is at least partially located in the opening K. In the fingerprint identification stage, can guarantee that response unit S received through the light of touch main part reflection, pass trompil K and shine on response unit S, avoided the light that is used for fingerprint detection to pierce through cathode layer 104 and produce certain light loss, improved the light penetration rate, increased the light quantity that response unit S received, and then improved the precision that fingerprint identification detected. The common electrode 1034 is electrically connected to the second electrode 1033, the common electrode 1034 and the second electrode 1033 have the same potential, and a storage capacitor C is formed between the overlapping region of the common electrode 1034 and the first electrode 1031. In the fingerprint identification detection stage, the storage capacitor C can be used as an energy storage element in the fingerprint identification circuit, so that the sensing unit can output uniform photocurrent to the light sensing device thin film transistor, the photocurrent can normally reflect the light intensity of reflected light, and the fingerprint identification detection accuracy is ensured.
Further, with continued reference to fig. 9, the sensing unit S of the present invention further includes an electrode contact layer 10321, and the electrode contact layer 10321 is disposed on the photosensitive layer 1032 near the second electrode 1033. In this embodiment, an electrode contact layer 10321 is formed on the photosensitive layer 1032, and the electrode contact layer 10321 is made of a transparent material, which can be the same as the material used for the second electrode 1033, such as indium tin oxide. In a photodiode, photosensitive layer 1032 has photosensitive characteristics to convert an optical signal into a current or voltage signal when it is illuminated. When the display panel is manufactured, the electrode contact film layer can be manufactured on the photosensitive layer film layer after the photosensitive layer film layer is manufactured, then, the same mask is used to etch the pattern of the photosensitive layer 1032 and the electrode contact layer 10321, the light-receiving surface of the photosensitive layer 1032 (i.e. the surface near the second electrode 1033) is directly contacted with the electrode contact layer 10321, in the etching process of the photosensitive layer 1032 and the electrode contact layer 10321, the light-receiving surface of the photosensitive layer 1032 does not directly contact with photoresist, etching solution and the like, so that a large number of defects are avoided after the light-receiving surface of the photosensitive layer 1032 is subjected to processes of coating photoresist, exposing, developing, etching, removing the photoresist by washing liquor and the like, the defects consume carriers generated by the photosensitive layer after receiving the illumination or the defects and electrons transferred to the photosensitive layer by the second electrode are recombined, so that the transmission of photocurrent is influenced. The electrode contact layer 10321 manufactured by the same etching process as the photosensitive layer 1032 in the invention ensures that the light receiving surface of the photosensitive layer 1032 does not generate a large number of defects, the interface contact of the surface of the photosensitive layer 1032 is improved, the current carriers generated after the photosensitive layer receives illumination can be normally and effectively transmitted to generate current, the photoelectric conversion performance of the photosensitive layer 1032 is ensured, and the performance reliability of the induction unit is ensured. In the embodiment, the electrode contact layer and the second electrode can be manufactured by the same etching process without adding a new process, and the process is simple and easy to implement.
In some alternative embodiments, fig. 10 is a film structure diagram of an array layer of a display panel according to an embodiment of the present invention. As shown in fig. 10, the array layer 101 includes a semiconductor active layer 1011, a source-drain metal layer 1012, and a gate metal layer 1013; the array layer 101 includes a plurality of thin film transistors for controlling the organic light emitting devices, wherein the semiconductor active layer 1011 is used to fabricate an active layer of the thin film transistor, the source and drain metal layers 1012 are used to fabricate a source electrode and a drain electrode of the thin film transistor, and the gate metal layer 1013 is used to fabricate a gate electrode of the thin film transistor. The first electrode 1031 in the sensing cell S shown in fig. 7 may be located on the same layer as the semiconductor active layer 1011 or the source-drain metal layer 1012 or the gate metal layer 1013. It should be noted that fig. 10 only illustrates metal film layers that may be included in the array layer, in order to ensure mutual insulation between the metal film layers, an insulating layer is further disposed between the metal film layers, and the array layer may further include film layer structures such as a substrate layer, a buffer layer, an interlayer insulating layer, a passivation layer, or a planarization layer, which are not shown in fig. 10. In the display panel with the embedded light sensing device, the first electrode in the sensing unit can be used for multiplexing a semiconductor active layer or a metal layer in the array layer, so that the process is saved.
Fig. 11 is a schematic view of a display device according to an embodiment of the present invention, where the display device includes a display panel according to any embodiment of the present invention. The display device provided by the invention can realize the fingerprint identification detection function. The negative pole layer in the display panel sets up the trompil, and the trompil is located the non-luminous area in the display panel, and the display device that this embodiment provided can improve the penetration rate of fingerprint identification light, and then improves the precision that fingerprint identification detected.
According to the embodiment, the display panel and the display device of the invention have the following beneficial effects:
in the layer structure of the display panel provided by the invention, the sensing unit is arranged on one side of the cathode layer far away from the display surface of the display panel, in the fingerprint identification stage, light reflected by the touch main body can penetrate through the film layer where the cathode is arranged to irradiate the sensing unit, the cathode layer is provided with the opening, and the orthographic projection of the sensing unit on the cathode layer is at least partially positioned in the opening, so that at least part of the light reflected by the touch main body can penetrate through the opening to irradiate the sensing unit, and the light loss is avoided when the light penetrates through the cathode layer (although the cathode layer is made of a light-transmitting material, the light loss is inevitably caused when the light penetrates through the dielectric layer), the light penetration rate is improved, the light quantity received by the sensing unit is increased, and the fingerprint identification detection precision is improved.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present 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 (9)
1. A display panel, comprising: the light-emitting device comprises an array layer, a light-emitting device layer and a light-sensing device;
the array layer is positioned on one side, away from the display surface of the display panel, of the light-emitting device layer;
the light-emitting device layer comprises a plurality of organic light-emitting devices, each organic light-emitting device comprises an anode, a light-emitting layer and a cathode, and the film layer where the cathode is located is a cathode layer;
the light sensing device comprises a plurality of sensing units, and the sensing units are positioned on one side of the cathode layer, which is far away from the display surface of the display panel; the sensing unit is positioned on one side of the array layer close to the light-emitting device layer;
the display area of the display panel comprises a luminous area and a non-luminous area, wherein the cathode layer is provided with a plurality of openings, the openings are positioned in the non-luminous area, and the orthographic projection of the sensing unit on the cathode layer is coincided with the openings;
the sensing unit comprises a first electrode, a photosensitive layer, an electrode contact layer and a second electrode which are sequentially arranged along the direction of the array layer pointing to the light-emitting device layer, and the electrode contact layer is made of a light-transmitting material; the light sensing device further comprises a light sensing device thin film transistor, and the light sensing device thin film transistor is located on the array layer.
2. The display panel according to claim 1,
the display panel comprises a plurality of signal wires, the signal wires are wired in the non-light-emitting region, and the orthographic projection part of the signal wires on the cathode layer is positioned in the opening.
3. The display panel according to claim 1,
the display panel comprises a plurality of signal wires, the signal wires are wired in the non-light-emitting area, and the orthographic projection of the signal wires on the cathode layer is not overlapped with the opening.
4. The display panel according to claim 2 or 3,
the display panel comprises a plurality of gate lines extending along a first direction and a plurality of data lines extending along a second direction, the first direction and the second direction are both parallel to the plate surface of the display panel, and the first direction and the second direction are crossed;
the signal line includes the gate line and/or the data line.
5. The display panel according to claim 1,
the first electrode is electrically connected with a first end of the light sensation device thin film transistor.
6. The display panel according to claim 5,
the light sensing device further comprises a common electrode, and the common electrode is electrically connected with the second electrode.
7. The display panel according to claim 5,
the first electrode is electrically connected with the first end of the light sensation device thin film transistor through a connecting electrode, and the connecting electrode and the anode are located on the same film layer.
8. The display panel according to claim 5, comprising:
the array layer comprises a semiconductor active layer, a source drain metal layer and a grid metal layer;
the first electrode and the semiconductor active layer or the source drain metal layer or the grid metal layer are positioned on the same film layer.
9. A display device characterized by comprising the display panel according to any one of claims 1 to 8.
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