CN110890411A - Display panel and display device - Google Patents
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- CN110890411A CN110890411A CN201911207330.7A CN201911207330A CN110890411A CN 110890411 A CN110890411 A CN 110890411A CN 201911207330 A CN201911207330 A CN 201911207330A CN 110890411 A CN110890411 A CN 110890411A
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/12—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto
- H01L31/125—Composite devices with photosensitive elements and electroluminescent elements within one single body
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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
Abstract
The invention discloses a display panel and a display device, wherein the display panel comprises: the device comprises a substrate, a plurality of photosensitive detection units, a plurality of solar battery units and a light source; the photosensitive detection units are respectively in one-to-one correspondence with the solar battery units; the orthographic projection of the photosensitive detection unit on the substrate base plate is positioned in the range of the orthographic projection of the corresponding solar cell unit on the substrate base plate; one part of light emitted by the light source is emitted to the solar cell units, and the other part of light is emitted from gaps between adjacent solar cell units and is emitted to the photosensitive detection unit after being reflected by fingers; the solar cell unit is used for converting light rays emitted by the light source to the solar cell unit into electric energy and storing the electric energy; and the photosensitive detection unit is used for detecting the light reflected by the finger and outputting a first photocurrent signal. The solar cell unit can prevent light from directly irradiating the photosensitive detection unit, converts the light into electric energy and stores the electric energy, and improves the light energy utilization rate of light source emergent rays.
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
Since an Organic Light-Emitting Diode (OLED) display product has the advantages of self-luminescence, high contrast, fast response speed, flexible display, simple process, etc., an Organic electroluminescent display gradually becomes a mainstream for the development of the display industry, and the OLED display product is gradually realized in a terminal product.
Since OLED display products have rich functions, such as functions of internet shopping, payment, and the like, security of the display products is getting more and more attention, and it is becoming more and more urgent to add a fingerprint recognition function to the display products. At present, a light shielding layer is required to be arranged in a fingerprint identifier to prevent a light source from directly irradiating a photosensitive detection element, so that the light of the light source is prevented from influencing a fingerprint identification result, however, the light shielding layer absorbs a large amount of light, and the loss of emergent light of the light source is serious.
Disclosure of Invention
The embodiment of the invention provides a display panel and a display device, which are used for solving the problem that the loss of light emitted by a light source in a fingerprint identifier in the prior art is serious.
In a first aspect, an embodiment of the present invention provides a display panel, including: the solar cell module comprises a substrate base plate, a plurality of photosensitive detection units, a plurality of solar cell units and a light source, wherein the photosensitive detection units are positioned on the substrate base plate;
the photosensitive detection units are respectively in one-to-one correspondence with the solar battery units; the orthographic projection of the photosensitive detection unit on the substrate base plate is positioned in the range of the orthographic projection of the corresponding solar cell unit on the substrate base plate;
one part of light emitted by the light source is emitted to the solar cell units, and the other part of light is emitted from gaps between the adjacent solar cell units and is emitted to the photosensitive detection unit after being reflected by fingers;
the solar cell unit is used for converting the light rays emitted by the light source to the solar cell unit into electric energy and storing the electric energy;
the photosensitive detection unit is used for detecting light reflected by the finger and outputting a first photocurrent signal.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the display panel further includes: a plurality of display devices located over the substrate base plate, and a controller;
the display device is positioned on one side of the photosensitive detection unit, which is far away from the substrate base plate;
the photosensitive detection unit corresponds to at least one adjacent display device;
the photosensitive detection unit is also used for detecting the light rays emitted by the corresponding display devices and outputting second photocurrent signals;
and the controller is used for determining the compensation quantity of each display device corresponding to the photosensitive detection unit according to the second photocurrent signal output by the photosensitive detection unit.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the solar cell unit is further configured to provide electric energy corresponding to the compensation amount to each corresponding display device under the control of the controller.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the controller is further configured to control the light source to emit light in a fingerprint identification period, and control the light source to turn off in a display period.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the display panel further includes: the solar cell panel is positioned on one side, away from the substrate, of the light source;
the solar cell panel is electrically connected with the light source and used for converting received light into electric energy and providing the electric energy for the light source.
In a possible implementation manner, in the display panel provided by the embodiment of the present invention, the light source is an electroluminescent light source.
In a possible implementation manner, in the above display panel provided in an embodiment of the present invention, the electroluminescent light source includes: the fluorescent powder comprises a first electrode, a second electrode and a fluorescent powder light-emitting layer, wherein the second electrode is positioned on one side of the first electrode, which is far away from the substrate base plate, and the fluorescent powder light-emitting layer is positioned between the first electrode and the second electrode.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the photosensitive detection unit is a photodiode.
In a possible implementation manner, in the above display panel provided by the embodiment of the present invention, the solar cell unit is a perovskite solar cell.
In a second aspect, an embodiment of the present invention further provides a display device, including: the display panel is provided.
The invention has the following beneficial effects:
the display panel and the display device provided by the embodiment of the invention comprise: the solar cell module comprises a substrate base plate, a plurality of photosensitive detection units, a plurality of solar cell units and a light source, wherein the photosensitive detection units are positioned on the substrate base plate; the photosensitive detection units are respectively in one-to-one correspondence with the solar battery units; the orthographic projection of the photosensitive detection unit on the substrate base plate is positioned in the range of the orthographic projection of the corresponding solar cell unit on the substrate base plate; one part of light emitted by the light source is emitted to the solar cell units, and the other part of light is emitted from gaps between adjacent solar cell units and is emitted to the photosensitive detection unit after being reflected by fingers; the solar cell unit is used for converting light rays emitted by the light source to the solar cell unit into electric energy and storing the electric energy; and the photosensitive detection unit is used for detecting the light reflected by the finger and outputting a first photocurrent signal. According to the display panel provided by the embodiment of the invention, the solar cell unit is arranged between the photosensitive detection unit and the substrate, and the orthographic projection of the photosensitive detection unit on the substrate is positioned in the orthographic projection range of the corresponding solar cell unit on the substrate, the solar cell unit can convert the light emitted by the light source to the solar cell into electric energy and store the electric energy, so that the light emitted by the light source to the solar cell unit is absorbed, the light emitted by the light source is prevented from being directly emitted to the photosensitive detection unit, the solar cell unit can convert the light into the electric energy and store the electric energy, and the electric energy stored by the solar cell unit can be continuously utilized subsequently, so that the problem of serious loss of the light emitted by the light source is avoided, and the light energy utilization rate of the light emitted by the light source is improved.
Drawings
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a second schematic structural diagram of a display panel according to an embodiment of the invention;
fig. 3 is a third schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an electroluminescent light source according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a solar cell unit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a signal conversion circuit according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a display panel and a display device, aiming at the problem that the loss of light emitted by a light source in a fingerprint identifier in the prior art is serious.
The following describes in detail a specific embodiment of a display panel and a display device according to an embodiment of the present invention with reference to the drawings. The thicknesses and shapes of the various film layers in the drawings are not to be considered true proportions, but are merely intended to illustrate the present invention.
In a first aspect, an embodiment of the present invention provides a display panel, including: the device comprises a substrate base plate 100, a plurality of photosensitive detection units 101 positioned on the substrate base plate 100, a plurality of solar battery units 102 positioned between the photosensitive detection units 101 and the substrate base plate 100, and a light source 103 positioned on one side of the substrate base plate 100, which is far away from the photosensitive detection units 101;
the multiple photosensitive detection units 101 correspond to the multiple solar battery units 102 one by one respectively; the orthographic projection of the photosensitive detection unit 101 on the substrate base plate 100 is positioned in the range of the orthographic projection of the corresponding solar cell unit 102 on the substrate base plate 100;
a part of light emitted by the light source 103 is emitted to the solar battery cells 102, and the other part of light is emitted from a gap between adjacent solar battery cells 102, reflected by fingers and emitted to the photosensitive detection unit 101;
the solar cell unit 102 is used for converting light rays emitted to the solar cell unit 102 from a light source into electric energy and storing the electric energy;
the photosensitive detection unit 101 is configured to detect light reflected by a finger and output a first photocurrent signal.
According to the display panel provided by the embodiment of the invention, the solar cell unit is arranged between the photosensitive detection unit and the substrate, and the orthographic projection of the photosensitive detection unit on the substrate is positioned in the orthographic projection range of the corresponding solar cell unit on the substrate, the solar cell unit can convert the light emitted by the light source to the solar cell into electric energy and store the electric energy, so that the light emitted by the light source to the solar cell unit is absorbed, the light emitted by the light source is prevented from being directly emitted to the photosensitive detection unit, the solar cell unit can convert the light into the electric energy and store the electric energy, and the electric energy stored by the solar cell unit can be continuously utilized subsequently, so that the problem of serious loss of the light emitted by the light source is avoided, and the light energy utilization rate of the light emitted by the light source is improved.
The display panel provided in the embodiment of the present invention may be an organic electroluminescent display panel, and specifically, may be a bottom emission type organic electroluminescent display panel, or may also be a top emission type organic electroluminescent display panel, which is not limited herein.
In specific implementation, a fingerprint identification area may be set in a certain area of the display panel to realize fingerprint identification in the certain area, for example, when the display panel is applied to a device such as a mobile phone or a tablet computer, the fingerprint identification area may be set in the middle position of the bottom of the display panel. Alternatively, a plurality of fingerprint identification areas may be provided in the display panel to realize fingerprint identification of the plurality of areas. Alternatively, the entire display area of the display panel may be used as the fingerprint recognition area, so that fingerprint recognition can be performed at any position of the display area.
In the embodiment of the present invention, for convenience of description, the photosensitive detection unit, the solar cell unit and the light source are referred to as a fingerprint recognizer. In practical applications, each fingerprint identification area may have a plurality of fingerprint identifiers, and the number of fingerprint identifiers in the fingerprint identification area may be determined according to actually required fingerprint detection accuracy and the size of the fingerprint identification area.
In the embodiment of the present invention, the fingerprint identifiers are integrated into the display panel, and specifically, in each fingerprint identifier, the solar cell 102 is located on one side of the photosensitive detection unit 101 close to the substrate 100, and the orthographic projection of the photosensitive detection unit 101 on the substrate 100 is located within the range of the orthographic projection of the solar cell 102 on the substrate, so that the solar cell 102 can block the light emitted from the light source 103, and the light emitted from the light source 103 is prevented from directly emitting to the photosensitive detection unit 101, and the solar cell 102 can convert the light into electric energy and store the electric energy, thereby preventing the serious loss of the light emitted from the light source 103, and improving the light energy utilization rate of the light emitted from the light source 103.
Fig. 1 shows a schematic structural diagram of a fingerprint sensor, and fig. 2 shows a schematic structural diagram of two fingerprint sensors, as shown in fig. 1 and 2, in order to ensure that the light emitted from the light source 103 does not directly irradiate the photosensitive detection unit 101, the light source 103 may be further configured to include a plurality of point light sources Q, at least one point light source Q is disposed in each fingerprint sensor, and the orthographic projection of the point light source Q in the fingerprint sensor on the substrate 100 is within the range of the orthographic projection of the solar cell 102 on the substrate 100.
Specifically, of the light rays emitted from the point light source Q, the light rays with a smaller inclination angle are directly emitted to the solar battery cells 102, and the light rays with a larger inclination angle can be emitted from the gaps between the adjacent solar battery cells 102.
In specific implementation, the inclination angle of the light source 103 for emitting light from the gap between the adjacent solar battery cells 102 can be adjusted by adjusting the distance between the light source 103 and the solar battery cell 102, and specifically, the larger the distance between the light source 103 and the solar battery cell 102, the smaller the inclination angle of the light emitted by the light source 103.
Fig. 3 is a schematic diagram illustrating a fingerprint identification principle of a display panel according to an embodiment of the present invention, as shown in fig. 3, light emitted from a light source 103 is emitted from a gap between adjacent photosensitive detection units 101, when a finger touches a surface of the display panel, the light is reflected to a position of the photosensitive detection unit 101 by the finger, and due to different reflection amounts of the light by the valley and the ridge of the finger, a pattern of the finger fingerprint can be determined by analyzing the light detected by the photosensitive detection unit 101, specifically, the photosensitive detection unit 101 outputs a first photocurrent signal after detecting the light, and the pattern of the finger fingerprint can be determined according to the first photocurrent signals output by the plurality of photosensitive detection units 101.
In a specific implementation, as the service life of the display panel is prolonged, the characteristics of the thin film transistor in a certain area of the display panel may change, for example, a negative bias may occur, which may cause an image to remain on the screen, resulting in a poor display, and therefore, the area needs to be compensated.
Further, as shown in fig. 1, the display panel provided in the embodiment of the present invention may further include: a plurality of display devices (not shown) on the substrate base 100, and a controller (not shown);
the display device is positioned on one side of the photosensitive detection unit 101, which is far away from the substrate base plate 100;
the photosensitive detection unit 101 corresponds to at least one adjacent display device;
the photosensitive detection unit 101 is further configured to detect light rays emitted by the corresponding display devices and output a second photocurrent signal;
and the controller is used for determining the compensation quantity of each display device corresponding to the photosensitive detection unit 101 according to the second photocurrent signal output by the photosensitive detection unit 101.
As shown in fig. 1, the display panel may further include: the pixel defining layer PDL is located on a side of the photosensitive detection unit 101 facing away from the substrate 100, and is used to define a pixel unit. Specifically, the display device may include an anode, an organic light emitting layer over the anode, and a cathode layer covering the organic light emitting layer.
Specifically, each photosensitive detection unit 101 corresponds to at least one adjacent display device, for example, each photosensitive detection unit 101 corresponds to 9 adjacent display devices, and the 9 display devices are uniformly distributed near the photosensitive detection unit 101 as much as possible, so that in a display time period, the photosensitive detection unit 101 can detect light emitted by the corresponding 9 display devices and output a second photocurrent signal, the controller can determine the light emission intensity of the 9 display devices corresponding to the photosensitive detection unit 101 according to the second photocurrent signal output by the photosensitive detection unit 101, and in combination with a predetermined compensation ratio, the compensation amount of each display device corresponding to the photosensitive detection unit 101 can be determined.
That is to say, the photosensitive detection unit 101 can be used to detect the light reflected by the finger in the fingerprint identification time period, and can also feed back the intensity of the corresponding emergent light of the display device in the display time period, so that the required compensation amount of the display device can be reflected in real time according to the second photocurrent signal output by the photosensitive detection unit 101, and the required compensation amount can be accurately determined, so that the compensation amount can be adjusted according to the actual brightness, the compensation accuracy of the display device is improved, and the display effect of the display panel is improved.
Furthermore, in the display panel provided by the embodiment of the present invention, the solar cell unit is further configured to provide electric energy corresponding to the compensation amount to each corresponding display device under the control of the controller.
The electric energy stored by the solar cell unit is provided for the corresponding display device, so that the compensation of the display device is realized, the energy can be saved, the power consumption of the display panel is reduced, the controller can control the solar cell to provide the corresponding electric energy for the corresponding display device according to the determined compensation amount required by each display device, the compensation precision is improved, and the display effect of the display panel is improved.
In addition, in addition to providing energy for optical compensation of the display device, the energy stored in the solar cell unit may also be used to provide driving energy for the thin film transistor, or may also be used to power other components of the display panel, which is not limited herein.
In practical applications, if the display brightness in a certain area of the display panel is insufficient, the second photocurrent signal output by the photosensitive detection unit 101 can be used to detect the display brightness, and the controller controls the solar cell to provide electric energy to the corresponding display device, so that the display brightness in the area can meet the requirement.
Specifically, the solar cell unit may be disposed to be connected to a data line of a corresponding display device, and the electric power stored in the solar cell may be supplied to the corresponding display device through the data line.
In specific implementation, the display time period and the fingerprint identification time period of the display panel may be performed in a time-sharing manner, for example, a period of time may be set as the fingerprint identification time period after the display panel is powered on to perform power-on verification, or a period of fingerprint identification time period may be triggered to perform fingerprint identification when a certain application that needs to perform fingerprint identification is started, or when operations such as payment are required while a certain application is running.
In order to avoid the influence of the compensation process of the display devices on the display effect, the display devices can be compensated by using a startup time period, specifically, in the startup time period, the photosensitive detection unit is used as a photosensitive sensor for optical compensation to detect the light emitting condition of each corresponding display device, the controller can determine the compensation amount of each display device corresponding to the photosensitive detection unit according to a predetermined compensation proportion, and then the controller controls the solar cell unit to provide corresponding electric energy for each display device according to the compensation amount of each display device. After the compensation of each display device is completed in the starting-up time period, the display signals of each display device can be adjusted according to the compensation result of each display device in the display time period after the starting-up so as to realize better display effect.
In practical applications, in the display panel provided in the embodiment of the present invention, the controller is further configured to control the light source to emit light during a fingerprint identification time period, and control the light source to turn off during a display time period.
The light source is used for providing light rays in the fingerprint identification time period, and the light source does not need to emit light in the display time period, so that the light source can be controlled to emit light in the fingerprint identification time period through the controller and be turned off in the display time period, the display effect is prevented from being influenced by the light source in the display time period, and the loss of the light source can be reduced.
As shown in fig. 1, the photosensitive detection unit 101 may be a photodiode, that is, the photosensitive detection unit 101 may include: transparent electrode 101a (i.e., P)+Electrode), metal electrode 101b (N)—Electrodes) and an intrinsic semiconductor layer 101c between the transparent electrode 101a and the metal electrode 101b, specifically, a transparent conductive oxide material such as Indium Tin Oxide (ITO) can be used for the transparent electrode 101a, and a light-opaque metal material can be used for the metal electrode 101 b.
As shown in fig. 1, the transparent electrode 101a in the photosensitive detection unit 101 is electrically connected to the first electrode lead 110 through the connection structure 111, the first electrode lead 110 is electrically connected to the gate G of the thin film transistor TFT through the second electrode lead SD2, and the metal electrode 101b in the photosensitive detection unit 101 is electrically connected to the drain D of the thin film transistor TFT through the second signal line L, and in practical applications, the photosensitive detection unit 101 can be controlled to output the first photocurrent signal or the second photocurrent signal through the thin film transistor TFT.
In addition, the thin film transistor TFT further includes a source electrode SD1, in order to avoid light from directly irradiating the thin film transistor TFT to generate photo-generated carriers, a light shielding unit 105 may be disposed on a side of the thin film transistor TFT close to the substrate base plate 100, a buffer layer 104 may be disposed on a side of the light shielding unit 105 away from the substrate base plate 100, an interlayer insulating layer 106 may be disposed on a side of the buffer layer 104 away from the substrate base plate 100, a first passivation layer 107 may be disposed on a side of the interlayer insulating layer 106 away from the substrate base plate 100, a second passivation layer 108 may be disposed on a side of the second electrode lead SD2 and the photo-sensitive detection unit 101 away from the substrate base plate 100, and a planarization layer 109 may be disposed between the second passivation layer.
As shown in fig. 2, the organic light emitting layer 112 is located on a side of the photosensitive detecting unit 101 away from the substrate 100, and a polarizer 113, which may be a circular polarizer, is disposed on a side of the organic light emitting layer 112 away from the substrate 100, for preventing ambient light from affecting the display effect of the display panel, and a package cover plate 114 is further disposed on a side of the polarizer 113 away from the substrate 100, for packaging and protecting.
Optionally, in the display panel provided in the embodiment of the present invention, referring to fig. 1, the display panel may further include: a solar cell panel (not shown) on the side of the light source 103 facing away from the substrate base 100;
the solar cell panel is electrically connected to the light source 103, and is configured to convert the received light into electrical energy and supply the electrical energy to the light source 103.
Specifically, can set up solar cell panel according to actual space size, can set up a monoblock solar cell panel, also can set up polylith solar cell, do not do the restriction here. The solar panel may convert ambient light into electrical energy to provide the light source 103 with the required energy. In practical applications, a corresponding light-passing hole may be provided in the display device at a position corresponding to the solar cell panel, so that the ambient light can be irradiated to the solar cell panel.
Provide the energy for fingerprint identification ware through solar cell panel to realized fingerprint identification ware's self-driven function, therefore fingerprint identification ware need not with display panel power sharing, avoided fingerprint identification ware to influence the electric energy supply that the picture shows, guaranteed that display panel has good display effect, and, need not to be equipped with the power for fingerprint identification ware alone again, made fingerprint identification ware portable.
Specifically, in the display panel provided by the embodiment of the present invention, the light source may be an electroluminescent light source. In the manufacturing process, the electroluminescent light source can be patterned, so that a plurality of point light sources can be formed conveniently. In addition, the electroluminescent light source can be more easily integrated into the display panel, the manufacturing process is simplified, the service life of the display panel is prolonged, and the power consumption of the electroluminescent light source is lower, so that the use power consumption of the display panel is reduced.
The Light source may be a Light Emitting Diode (LED) Light source, or may be another Light source, which is not limited herein.
Specifically, in the display panel provided in the embodiment of the present invention, as shown in fig. 4, the electroluminescent light source may include: a first electrode 201, a second electrode 202 located on a side of the first electrode 201 away from the substrate 100, and a phosphor emission layer 203 located between the first electrode 201 and the second electrode 202.
In a specific implementation, the first electrode 201 may be electrically connected to the solar panel through a first wire 206, and the second electrode 202 may be electrically connected to the solar panel through a second wire 207, so as to provide the electric energy stored in the solar panel to the light source. Under the action of an electric field provided by the solar cell panel, electrons in the fluorescent powder luminescent layer 203 are accelerated to reach higher energy, collide with a luminescent center and are ionized, and when the excited luminescent center returns to a ground state or the electrons and holes are compounded, the high-speed electrons release energy to emit light.
Specifically, the first electrode 201 may be made of a transparent conductive material, for example, an indium tin oxide material, and the second electrode 202 may be made of a metal material. In addition, a dielectric layer 204 may be disposed between the second electrode 202 and the phosphor emission layer 203 to improve electron transport efficiency. A sealed envelope 205 may be provided on the side of the second electrode 202 facing away from the first electrode 201.
In practical applications, in the display panel provided by the embodiment of the invention, the solar cell unit may be a perovskite solar cell. As shown in fig. 5, the solar cell unit may include: a substrate 301, a third electrode 302 located on the substrate 301, a fourth electrode 303 located on a side of the third electrode 302 facing away from the substrate 301, a perovskite layer 304 located between the third electrode 302 and the fourth electrode 303, an electron transport layer 305 located between the fourth electrode 303 and the perovskite layer 304, a hole transport layer 306 located between the third electrode 302 and the perovskite layer 304, and a hole transport layer 307 located between the hole transport layer 306 and the perovskite layer 304. Among them, the electron transport layer 305 is used to transport electrons and block hole transport, and the hole transport layer 307 is used to transport holes and block electron transport. The third electrode 302 may be made of a transparent conductive material, and the fourth electrode 303 may be made of a metal material.
In practical applications, the fourth electrode 303 is closer to the light source 103, that is, the structure shown in fig. 5 is inverted on the substrate 100, after the light emitted from the light source 103 irradiates the solar cell, a potential difference is generated at a corresponding position irradiated by the light source, and quasi-fermi energy levels are different at the grain boundary of the semiconductor, so that a built-in electric field is formed. The photo-generated electrons and holes move in different directions under the action of this electric field, thereby forming a photocurrent.
Because the manufacturing process of the solar cell unit is similar to that of the display panel, in the actual process, the manufacturing process of the solar cell unit can be compatible with that of the display panel, for example, a printing method can be adopted to manufacture the solar cell, the process is simple, or the manufactured solar cell unit can be attached to a response position, and the process is not limited herein.
In a specific implementation, the controller may include a signal conversion circuit, as shown in fig. 6, the signal conversion circuit may include: a signal amplification unit 401 electrically connected to the photosensitive detection unit 101, an analog-to-digital conversion unit 402 electrically connected to the signal amplification unit 401, and a processing unit 403 electrically connected to the analog-to-digital conversion unit 402. Therefore, the functions of controlling the switch, feeding back signals and amplifying signals are realized, the detection sensitivity of the fingerprint identification function of the fingerprint identifier and the real-time compensation function of the display device is improved, and the structure of the fingerprint identifier can be further simplified.
In a second aspect, based on the same inventive concept, an embodiment of the present invention further provides a display device, including the display panel, where the display device may be applied to any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator. Since the principle of the display device to solve the problem is similar to that of the display panel, the display device can be implemented by the display panel, and repeated descriptions are omitted.
According to the display panel and the display device provided by the embodiment of the invention, the solar cell unit is arranged between the photosensitive detection unit and the substrate, and the orthographic projection of the photosensitive detection unit on the substrate is positioned in the orthographic projection range of the corresponding solar cell unit on the substrate, the solar cell unit can convert the light emitted by the light source to the solar cell into electric energy and store the electric energy, so that the light emitted by the light source to the solar cell unit is absorbed, the light emitted by the light source is prevented from directly emitting to the photosensitive detection unit, the solar cell unit can convert the light into the electric energy and store the electric energy, and the electric energy stored in the solar cell unit can be continuously utilized subsequently, so that the problem of serious loss of the light emitted by the light source is avoided, and the light energy utilization rate of the light emitted by the light source is improved. In addition, the photosensitive detection unit can also detect the emergent light of the corresponding display device in the display time period, the controller can determine the compensation amount of each display device corresponding to the photosensitive detection unit according to the second photocurrent signal output by the photosensitive detection unit, and the controller can also control the electric energy stored by the solar cell unit to be supplied to the corresponding display device, so that the real-time compensation of the display device in the display panel is realized, the compensation precision is improved, and the display effect of the display panel is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A display panel, comprising: the solar cell module comprises a substrate base plate, a plurality of photosensitive detection units, a plurality of solar cell units and a light source, wherein the photosensitive detection units are positioned on the substrate base plate;
the photosensitive detection units are respectively in one-to-one correspondence with the solar battery units; the orthographic projection of the photosensitive detection unit on the substrate base plate is positioned in the range of the orthographic projection of the corresponding solar cell unit on the substrate base plate;
one part of light emitted by the light source is emitted to the solar cell units, and the other part of light is emitted from gaps between the adjacent solar cell units and is emitted to the photosensitive detection unit after being reflected by fingers;
the solar cell unit is used for converting the light rays emitted by the light source to the solar cell unit into electric energy and storing the electric energy;
the photosensitive detection unit is used for detecting light reflected by the finger and outputting a first photocurrent signal.
2. The display panel of claim 1, further comprising: a plurality of display devices located over the substrate base plate, and a controller;
the display device is positioned on one side of the photosensitive detection unit, which is far away from the substrate base plate;
the photosensitive detection unit corresponds to at least one adjacent display device;
the photosensitive detection unit is also used for detecting the light rays emitted by the corresponding display devices and outputting second photocurrent signals;
and the controller is used for determining the compensation quantity of each display device corresponding to the photosensitive detection unit according to the second photocurrent signal output by the photosensitive detection unit.
3. The display panel of claim 2, wherein the solar cell unit is further configured to supply electrical energy corresponding to the compensation amount to each of the corresponding display devices under the control of the controller.
4. The display panel of claim 2, wherein the controller is further configured to control the light source to emit light during a fingerprint recognition period and to control the light source to turn off during a display period.
5. The display panel of claim 1, further comprising: the solar cell panel is positioned on one side, away from the substrate, of the light source;
the solar cell panel is electrically connected with the light source and used for converting received light into electric energy and providing the electric energy for the light source.
6. The display panel according to any one of claims 1 to 5, wherein the light source is an electroluminescent light source.
7. The display panel of claim 6, wherein the electroluminescent light source comprises: the fluorescent powder comprises a first electrode, a second electrode and a fluorescent powder light-emitting layer, wherein the second electrode is positioned on one side of the first electrode, which is far away from the substrate base plate, and the fluorescent powder light-emitting layer is positioned between the first electrode and the second electrode.
8. The display panel according to any one of claims 1 to 5, wherein the photosensitive detection unit is a photodiode.
9. The display panel according to any one of claims 1 to 5, wherein the solar cell unit is a perovskite solar cell.
10. A display device, comprising: the display panel according to any one of claims 1 to 9.
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| CN201911207330.7A CN110890411A (en) | 2019-11-29 | 2019-11-29 | Display panel and display device |
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| CN201911207330.7A CN110890411A (en) | 2019-11-29 | 2019-11-29 | Display panel and display device |
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| CN113093419A (en) * | 2021-04-19 | 2021-07-09 | 天马微电子股份有限公司 | Display panel and display device |
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