CN108155222A - A kind of organic electroluminescence display device and method of manufacturing same - Google Patents

Abstract

This application discloses a kind of organic electroluminescence display device and method of manufacturing same, including：Underlay substrate, the organic electroluminescence structure on underlay substrate；Organic electroluminescence structure, for normally showing period normal luminous, as photosensitive element when adding reverse blas outside the fingerprint recognition period；It further includes：Positioned at the fingerprint recognition chip that is used to user's finger provide the light source emitter of light source and with photosensitive element be electrically connected of the underlay substrate far from organic electroluminescence structure side；Fingerprint recognition chip for the image information acquired according to photosensitive element, identifies the fingerprint pattern of user's finger.The application has the characteristic of light sensitive diode using organic electroluminescence structure under inverse inclined state, organic electroluminescence structure is realized into display and fingerprint identification function using timesharing driving, compared to traditional display device, it reduces and interferes with each other, sensing signal amount is increased, and reduces module thickness and cost of manufacture.

Description

An organic electroluminescence display device

technical field

The invention relates to the field of display technology, in particular to an organic electroluminescence display device.

Background technique

Organic Electroluminescent Display (OLED) is one of the hot spots in the field of flat panel display research today. Compared with liquid crystal displays, OLED has low power consumption, high color saturation, wide viewing angle, thin thickness, fast response speed and It can achieve excellent performance such as flexibility. Currently, in the display fields of mobile phones, tablet computers, and digital cameras, OLEDs have begun to replace traditional liquid crystal displays.

In order to have the fingerprint identification function, as shown in Figure 1, OLED display 01 generally has a fingerprint identification module 02 including a photosensitive element, LED, and fingerprint identification chip installed under the lower substrate. This traditional structure requires additional space and materials, which will cause The module space of the whole machine becomes larger, the thickness increases and the cost increases, and if the photosensitive element is placed under the lower substrate, the light reflected from the finger needs to pass through the lower substrate, and the signal volume will be attenuated again.

Therefore, under the trend of high screen-to-body ratio of smart phones, how to solve the problems of OLED module space, thickness increase or production cost increase and insufficient sensing signal volume caused by the introduction of fingerprint recognition function is an urgent need for those skilled in the art to solve. technical problems.

Contents of the invention

In view of this, the object of the present invention is to provide an organic electroluminescent display device, which increases the amount of sensing signals, and reduces the thickness of the module and the manufacturing cost. The specific plan is as follows:

An organic electroluminescent display device, comprising: a base substrate, and an organic electroluminescent structure located on the base substrate;

The organic electroluminescent structure is used to emit light normally during the normal display time period, and is used as a photosensitive element when a reverse bias voltage is applied during the fingerprint recognition time period;

It also includes: a light source emitter located on the side of the base substrate away from the organic electroluminescent structure for providing a light source for the user's finger, and a fingerprint identification chip electrically connected to the photosensitive element;

The fingerprint identification chip is used to identify the fingerprint pattern of the user's finger according to the image information collected by the photosensitive element.

Preferably, the organic electroluminescent display device provided in the embodiment of the present invention further includes: a control circuit electrically connected to the organic electroluminescent structure and the fingerprint recognition chip;

The control circuit is used to drive the organic electroluminescent structure to emit light normally during the normal display time period; it is also used to apply a reverse bias voltage to the organic electroluminescent structure during the fingerprint recognition time period, Drive the fingerprint identification chip for fingerprint identification.

Preferably, in the above-mentioned organic electroluminescent display device provided by the embodiment of the present invention, the control circuit includes a data writing module, a driving module, a switching module and an output module; wherein,

The control end of the data writing module is connected to the scanning line, the input end is connected to the data line, and the output end is connected to the control end of the driving module; the data writing module is used to output scanning signals when the scanning line , providing the data signal output by the data line to the control terminal of the driving module;

The input terminal of the driving module is connected to the first node, and the output terminal is connected to the anode of the organic electroluminescent structure; the cathode of the organic electroluminescent structure is connected to the second node; the driving module is used for Under the control of the data signal, drive the organic electroluminescent structure to emit light according to the potential of the first node;

The control terminal of the switching module is connected to the signal input terminal, the input terminal is respectively connected to the high-level signal terminal and the low-level signal terminal, and the output terminal is respectively connected to the first node and the second node; the switching A module, configured to switch the potentials of the first node and the second node according to the signals output by the high-level signal terminal and the low-level signal terminal under the control of the signal input terminal; the first node and the the potentials of the second node are opposite;

The control terminal of the output module is connected to the signal input terminal, the input terminal is connected to the first node, and the output terminal is connected to the fingerprint recognition chip; the output module is used to control the signal input terminal , driving the fingerprint identification chip for fingerprint identification according to the potential of the first node.

Preferably, in the above-mentioned organic electroluminescent display device provided by an embodiment of the present invention, the data writing module includes a first switching transistor; wherein,

The gate of the first switching transistor is connected to the scanning line, the source is connected to the data line, and the drain is connected to the control terminal of the driving module.

Preferably, in the above-mentioned organic electroluminescence display device provided by the embodiment of the present invention, the driving module includes a second switching transistor and a capacitor; wherein,

The gate of the second switching transistor is connected to the drain of the first switching transistor, the source is connected to the first node, and the drain is connected to the anode of the organic electroluminescent structure;

Both ends of the capacitor are respectively connected to the gate and the source of the second switch transistor.

Preferably, in the above-mentioned organic electroluminescent display device provided by an embodiment of the present invention, the switching module includes a third switching transistor, a fourth switching transistor, a fifth switching transistor, and a sixth switching transistor; wherein,

The gate of the third switch transistor is connected to the signal input terminal, the source is connected to the high-level signal terminal, and the drain is connected to the first node;

The gate of the fourth switching transistor is connected to the signal input terminal, the source is connected to the low-level signal terminal, and the drain is connected to the second node;

The gate of the fifth switching transistor is connected to the signal input terminal, the source is connected to the low-level signal terminal, and the drain is connected to the first node;

The gate of the sixth switch transistor is connected to the signal input terminal, the source is connected to the high-level signal terminal, and the drain is connected to the second node.

Preferably, in the above-mentioned organic electroluminescence display device provided by the embodiment of the present invention, the output module includes a seventh switching transistor; wherein,

The gate of the seventh switch transistor is connected to the signal input terminal, the source is connected to the first node, and the drain is connected to the fingerprint identification chip.

Preferably, in the above-mentioned organic electroluminescent display device provided by the embodiment of the present invention, both the third switch transistor and the fourth switch transistor are N-type transistors; the first switch transistor, the second switch transistor The transistors, the fifth switch transistor, the sixth switch transistor and the seventh switch transistor are all P-type transistors.

Preferably, in the above-mentioned organic electroluminescent display device provided by the embodiment of the present invention, during the fingerprint identification time period, the first node maintains a low potential, and the second node maintains a high potential;

During the normal display period, the first node maintains a high potential, and the second node maintains a low potential.

Preferably, in the organic electroluminescence display device provided by the embodiment of the present invention, the first switch transistor and the second switch transistor are located in the area surrounded by the scan line and the data line.

Preferably, the organic electroluminescent display device provided in the embodiment of the present invention further includes: a printed circuit board and a flexible circuit board;

The third switch transistor, the fourth switch transistor, the fifth switch transistor, the sixth switch transistor and the seventh switch transistor are all located on the printed circuit board or the flexible circuit board.

Preferably, the organic electroluminescence display device provided in the embodiment of the present invention further includes: a main board connected to the flexible circuit board;

The fingerprint recognition chip is located on the motherboard.

An organic electroluminescence display device provided by the present invention comprises: a base substrate, an organic electroluminescence structure located on the substrate substrate; It is used as a photosensitive element when a reverse bias voltage is applied during the recognition period; it also includes: a light source emitter located on the side of the substrate away from the organic electroluminescent structure for providing a light source for the user's finger, and a fingerprint recognition device electrically connected to the photosensitive element Chip; fingerprint identification chip, used to identify the fingerprint pattern of the user's finger according to the image information collected by the photosensitive element. The invention utilizes the characteristics of the photodiode in the reverse bias state of the organic electroluminescent structure, and uses the time-sharing drive of the organic electroluminescent structure to realize the display and fingerprint identification functions. Compared with the traditional display device, it reduces mutual interference and increases The amount of sensing signals is increased, and the thickness of the module and the manufacturing cost are reduced.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

1 is a schematic structural view of an organic electroluminescent display device in the prior art;

2 is a schematic structural view of an organic electroluminescent display device provided by an embodiment of the present invention;

3 is a current-voltage relationship diagram of an organic electroluminescent display device provided by an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a control circuit provided by an embodiment of the present invention;

FIG. 5 is a circuit timing diagram of the control circuit shown in FIG. 4 .

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The present invention provides an organic electroluminescent display device, as shown in FIG. 2 , comprising: a base substrate 1, and an organic electroluminescent structure 2 located on the base substrate 1;

The organic electroluminescent structure 2 is used to emit light normally during the normal display time period, and acts as a photosensitive element when a reverse bias voltage is applied during the fingerprint recognition time period;

It also includes: a light source emitter 3 located on the side of the base substrate 1 away from the organic electroluminescent structure 2 for providing a light source for the user's finger, and a fingerprint identification chip 4 electrically connected to the photosensitive element;

The fingerprint identification chip 4 is used to identify the fingerprint pattern of the user's finger according to the image information collected by the photosensitive element.

In the above-mentioned organic electroluminescent display device provided by the embodiment of the present invention, the organic electroluminescent structure has the characteristics of a photosensitive diode in the reverse bias state, and the organic electroluminescent structure is driven by time-sharing to realize the display and fingerprint identification functions. As shown in Figure 3, during the normal display time period, when the voltage is positive, the organic electroluminescent structure emits light normally; , to realize fingerprint identification, compared with traditional display devices, it reduces mutual interference, increases the amount of sensing signals, and reduces the thickness of the module and the production cost.

It should be noted that the above-mentioned organic electroluminescent display device provided in the embodiment of the present invention may also include: a packaging layer located at the packaging organic electroluminescent structure, a printed circuit board and a flexible circuit board connected with the organic electroluminescent structure, Other structures such as the display driver chip on the printed circuit board, and structures such as thin film transistors, gate lines, and data lines are generally formed on the substrate. These specific structures can be implemented in various ways, which are not limited here. In addition, as shown in FIG. 2 , the organic electroluminescent display device may further include: a main board connected to the flexible circuit board; the fingerprint identification chip 4 may be located on the main board.

During specific implementation, in the above-mentioned organic electroluminescent display device provided by the embodiment of the present invention, in order to ensure that the organic electroluminescent structure is driven in time division to realize the display and fingerprint identification functions, on the power supply that supplies the organic electroluminescent structure with current A control circuit can be added, which is equivalent to a switch, which is used to switch the anode and cathode voltages of the organic electroluminescent structure when switching between the normal display mode and the fingerprint recognition mode, so the organic electroluminescent display device also includes: A control circuit electrically connected to the organic electroluminescent structure and the fingerprint identification chip; the control circuit is used to drive the organic electroluminescent structure to emit light normally during the normal display period; The luminescent structure applies a reverse bias to drive the fingerprint identification chip for fingerprint identification.

Specifically, during implementation, in the above-mentioned organic electroluminescent display device provided by the embodiment of the present invention, as shown in FIG. 4 , the control circuit may include a data writing module 100, a driving module 200, a switching module 300 and an output module 400; wherein,

The control terminal of the data writing module 100 is connected to the scanning line, the input terminal is connected to the data line, and the output terminal is connected to the control terminal of the driving module 200; the data writing module 100 is used to output the data line to the scanning signal when the scanning line outputs the scanning signal. The data signal is provided to the control end of the drive module 200;

The input terminal of the driving module 200 is connected to the first node A, and the output terminal is connected to the anode of the organic electroluminescent structure; the cathode of the organic electroluminescent structure is connected to the second node B; the driving module 200 is used for controlling the data signal Next, according to the potential of the first node A, the organic electroluminescent structure is driven to emit light;

The control terminal of the switching module 300 is connected to the signal input terminal, the input terminal is respectively connected to the high-level signal terminal OVDD and the low-level signal terminal OVSS, and the output terminal is respectively connected to the first node A and the second node B; the switching module 300, It is used to switch the potentials of the first node A and the second node B according to the signals output by the high-level signal terminal OVDD and the low-level signal terminal OVSS under the control of the signal input terminal; the potential of the first node A and the second node B Potential opposite;

The control terminal of the output module 400 is connected to the signal input terminal, the input terminal is connected to the first node A, and the output terminal is connected to the fingerprint identification chip; the output module 400 is used to, under the control of the signal input terminal, according to the potential of the first node A, Driver fingerprint identification chip fingerprint identification.

The present invention will be described in detail below in conjunction with specific embodiments. It should be noted that this embodiment is for better explaining the present invention, but not limiting the present invention.

During specific implementation, as shown in FIG. 4 , the data writing module 100 may include a first switch transistor T1; wherein, the gate of the first switch transistor T1 is connected to the scan line, the source is connected to the data line, and the drain is connected to the drive The control terminal of the module 200.

Specifically, as shown in FIG. 4 , the first switching transistor T1 may be a P-type transistor. At this time, when the scanning signal output by the scanning line is at a low potential, the first switching transistor T1 is in the conduction state. When the scanning signal is at a high potential, the first switching transistor T1 is in a cut-off state. When the first switching transistor T1 is in the conducting state, the data signal output by the data line is transmitted to the control terminal of the driving module 200 through the first switching transistor T1, so as to control whether the driving module 200 is conducting.

The above is just an example to illustrate the specific structure of the data writing module in the control circuit. In actual implementation, the specific structure of the data writing module is not limited to the above-mentioned structure provided by the embodiment of the present invention, and can also be other structures known to those skilled in the art , is not limited here.

In a specific implementation, as shown in FIG. 4 , the drive module 200 may include a second switching transistor T2 and a capacitor C; wherein, the gate of the second switching transistor T2 is connected to the drain of the first switching transistor T1, and the source is connected to the first switching transistor T1. A node A is connected, and the drain is connected to the anode of the organic electroluminescent structure; both ends of the capacitor C are respectively connected to the gate and source of the second switching transistor T2.

Specifically, as shown in FIG. 4, the second switch transistor T2 may be a P-type transistor. At this time, when the data signal output by the data line is at a low potential, the second switch transistor T2 is in an on state. When the data signal is at a high potential, the second switching transistor T2 is in a cut-off state. When the second switch transistor T2 is in the conduction state, if the potential of the first node A is a high potential and the potential of the second node B is a low potential, the high level is transmitted to the organic electroluminescence structure through the second switch transistor T2. anode, while the cathode of the organic electroluminescent structure is low level, thereby driving the organic electroluminescent structure to emit light; if the potential of the first node A is low potential, and the potential of the second node B is high potential, the low level It is transmitted to the anode of the organic electroluminescent structure through the second switching transistor T2, and the cathode of the organic electroluminescent structure is at a high level. identify.

The above is just an example to illustrate the specific structure of the driving module in the control circuit. In actual implementation, the specific structure of the driving module is not limited to the above-mentioned structure provided by the embodiment of the present invention, and may also be other structures known to those skilled in the art. Do limited.

During specific implementation, as shown in FIG. 4 , the switch module 300 may include a third switch transistor T3, a fourth switch transistor T4, a fifth switch transistor T5, and a sixth switch transistor T6; wherein, the gate of the third switch transistor T3 Connected to the signal input terminal, the source is connected to the high-level signal terminal OVDD, and the drain is connected to the first node A; the gate of the fourth switching transistor T4 is connected to the signal input terminal, and the source is connected to the low-level signal terminal OVSS , the drain is connected to the second node B; the gate of the fifth switching transistor T5 is connected to the signal input terminal, the source is connected to the low-level signal terminal OVSS, and the drain is connected to the first node A; the sixth switching transistor T6 The gate is connected to the signal input terminal, the source is connected to the high-level signal terminal OVDD, and the drain is connected to the second node B.

Specifically, as shown in FIG. 4, both the third switching transistor T3 and the fourth switching transistor T4 can be N-type transistors. At this time, when the signal output from the signal input terminal is a high potential, the third switching transistor T3 and the fourth switching transistor T3 The switch transistor T4 is in a conduction state, and when the signal output from the signal input end is a low potential, the third switch transistor T3 and the fourth switch transistor T4 are in a cut-off state; when the third switch transistor T3 and the fourth switch transistor T4 are in a conduction state state, the potential of the first node A is a high potential, and the potential of the second node B is a low potential, and at this time, the organic electroluminescence structure emits light. The fifth switch transistor T5 and the sixth switch transistor T6 may both be P-type transistors. At this time, when the signal output from the signal input terminal is at a low potential, the fifth switch transistor T5 and the sixth switch transistor T6 are in a conduction state. When the signal output by the signal input terminal is at a high potential, the fifth switching transistor T5 and the sixth switching transistor T6 are in an off state; when the fifth switching transistor T5 and the sixth switching transistor T6 are in a conducting state, the potential of the first node A is a low potential, and the potential of the second node B is a high potential. At this time, the organic electroluminescent structure does not emit light, and acts as a photosensitive element in a reverse bias state, thereby realizing fingerprint recognition.

The above is just an example to illustrate the specific structure of the switching module in the control circuit. In the actual implementation, the specific structure of the switching module is not limited to the above-mentioned structure provided by the embodiment of the present invention, and can also be other structures known to those skilled in the art. Do limited.

During specific implementation, as shown in FIG. 4 , the output module 400 may include a seventh switching transistor T7; wherein, the gate of the seventh switching transistor T7 is connected to the signal input terminal, the source is connected to the first node A, and the drain is connected to the first node A. Fingerprint identification chip connection.

Specifically, as shown in FIG. 4, the seventh switching transistor T7 may be a P-type transistor. At this time, when the first node A is at a low potential, the seventh switching transistor T7 is in an on state, and when the first node A is at a high potential potential, the seventh switching transistor T7 is in a cut-off state. When the seventh switching transistor T7 is in the on state, the information collected by the photosensitive element can be transmitted to the fingerprint identification chip through the seventh switching transistor T7, thereby driving the fingerprint identification chip to realize fingerprint identification.

The above is just an example to illustrate the specific structure of the output module in the control circuit. In actual implementation, the specific structure of the output module is not limited to the above-mentioned structure provided by the embodiment of the present invention, and can also be other structures known to those skilled in the art. Do limited.

The following describes the working process of the control circuit provided by the embodiment of the present invention by taking the structure of the control circuit shown in Figure 4 as an example, wherein in the control circuit shown in Figure 4, the third switching transistor T3 and the fourth switching transistor T4 may all be N-type transistors; the first switch transistor T1 , the second switch transistor T2 , the fifth switch transistor T5 , the sixth switch transistor T6 and the seventh switch transistor T7 may all be P-type transistors. Each N-type transistor is turned on under the action of a high potential, and is turned off under the action of a low potential; each P-type transistor is turned on under the action of a low potential, and is turned off under the action of a high potential.

The corresponding input timing diagram is shown in FIG. 5 . Specifically, the two stages of the fingerprint recognition time period and the normal display time period in the input timing diagram shown in FIG. 5 are taken as examples for detailed description. In the following description, 1 represents a high potential, and 0 represents a low potential.

During the fingerprint recognition time period: the signal output by the signal input terminal remains at a low potential;

Since the signal output by the signal input end keeps a low potential, the fifth switching transistor T5, the sixth switching transistor T6 and the seventh switching transistor T7 are in a conducting state, and the third switching transistor T3 and the fourth switching transistor T4 are in an off state. , the high level of the high level signal terminal OVDD is transmitted to the second node B through the sixth switch transistor T6, causing the second node B to maintain a high potential; the low level of the low level signal terminal OVSS is transmitted through the fifth switch transistor T5 to the first node A, causing the first node A to maintain a low potential, and because the first node A is at a low potential, and the second node B is at a high potential, the anode of the organic electroluminescent structure is at a low potential, and the organic electroluminescent structure The cathode is at a high potential, and the organic electroluminescent structure does not emit light. In the reverse bias state, it acts as a photosensitive element. The photosensitive element transmits the collected information to the fingerprint identification chip through the seventh switching transistor T7, thereby realizing fingerprint identification.

During the normal display time period: the signal output by the signal input terminal maintains a high potential;

Since the signal output by the signal input end maintains a high potential, the fifth switching transistor T5, the sixth switching transistor T6 and the seventh switching transistor T7 are in an off state, and the third switching transistor T3 and the fourth switching transistor T4 are in a conducting state. , the high level of the high level signal terminal OVDD is transmitted to the first node A through the third switching transistor T3, causing the first node A to maintain a high potential; the low level of the low level signal terminal OVSS is transmitted through the fourth switching transistor T4 to the second node B, causing the second node B to maintain a low potential, and because the first node A is at a high potential and the second node B is at a low potential, the anode of the organic electroluminescent structure is at a high potential, and the organic electroluminescent structure The cathode is at a low potential, and the organic electroluminescent structure normally displays light.

In specific implementation, in the organic electroluminescent display device provided by the embodiment of the present invention, the first switch transistor T1 and the second switch transistor T2 may be located in the area surrounded by the scan line and the data line. The third switch transistor T3, the fourth switch transistor T4, the fifth switch transistor T5, the sixth switch transistor T6 and the seventh switch transistor T7 can all be located on the printed circuit board or the flexible circuit board, and of course, can also be located on the scanning line. and the area surrounded by data lines. The specific positions of the third switch transistor T3 , the fourth switch transistor T4 , the fifth switch transistor T5 , the sixth switch transistor T6 and the seventh switch transistor T7 may be determined according to actual conditions, and are not limited here.

An organic electroluminescence display device provided by an embodiment of the present invention includes: a base substrate, an organic electroluminescence structure located on the base substrate; It is used as a photosensitive element when a reverse bias is applied during the fingerprint recognition period; it also includes: a light source emitter located on the side of the substrate away from the organic electroluminescent structure for providing a light source for the user's finger, and a fingerprint electrically connected to the photosensitive element The identification chip; the fingerprint identification chip is used to identify the fingerprint pattern of the user's finger according to the image information collected by the photosensitive element. The invention utilizes the characteristics of the photodiode in the reverse bias state of the organic electroluminescent structure, and uses the time-sharing drive of the organic electroluminescent structure to realize the display and fingerprint identification functions. Compared with the traditional display device, it reduces mutual interference and increases The amount of sensing signals is increased, and the thickness of the module and the manufacturing cost are reduced.

Finally, it should also be noted that in this text, relational terms such as first and second etc. are only used to distinguish one entity or operation from another, and do not necessarily require or imply that these entities or operations, any such actual relationship or order exists. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The organic electroluminescent display device provided by the present invention has been introduced in detail above. The principles and implementation modes of the present invention have been explained by using specific examples in this paper. The descriptions of the above examples are only used to help understand the methods and methods of the present invention. Its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. limit.

Claims (12)

1. An organic electroluminescent display device comprising: the organic electroluminescence device comprises a substrate base plate and an organic electroluminescence structure, wherein the organic electroluminescence structure is positioned on the substrate base plate; it is characterized in that the preparation method is characterized in that,

the organic electroluminescent structure is used for emitting light normally in a normal display time period and is used as a photosensitive element when reverse bias is applied in a fingerprint identification time period;

further comprising: the light source emitter is positioned on one side of the substrate base plate, which is far away from the organic electroluminescent structure, and is used for providing a light source for a finger of a user, and the fingerprint identification chip is electrically connected with the photosensitive element;

the fingerprint identification chip is used for identifying the fingerprint pattern of the user finger according to the image information collected by the photosensitive element.

2. The organic electroluminescent display device according to claim 1, further comprising: the control circuit is electrically connected with the organic electroluminescent structure and the fingerprint identification chip respectively;

the control circuit is used for driving the organic electroluminescent structure to normally emit light in the normal display time period; and the organic electroluminescence structure is also used for applying reverse bias voltage to the organic electroluminescence structure in the fingerprint identification time period to drive the fingerprint identification chip to identify fingerprints.

3. The organic electroluminescent display device according to claim 2, wherein the control circuit comprises a data writing module, a driving module, a switching module and an output module; wherein,

the control end of the data writing module is connected with the scanning line, the input end of the data writing module is connected with the data line, and the output end of the data writing module is connected with the control end of the driving module; the data writing module is used for providing the data signals output by the data lines to the control end of the driving module when the scanning lines output scanning signals;

the input end of the driving module is connected with the first node, and the output end of the driving module is connected with the anode of the organic electroluminescent structure; the cathode of the organic electroluminescent structure is connected with the second node; the driving module is used for driving the organic electroluminescent structure to emit light according to the potential of the first node under the control of the data signal;

the control end of the switching module is connected with the signal input end, the input end of the switching module is respectively connected with the high-level signal end and the low-level signal end, and the output end of the switching module is respectively connected with the first node and the second node; the switching module is used for switching the potentials of the first node and the second node according to the signals output by the high-level signal end and the low-level signal end under the control of the signal input end; the potentials of the first node and the second node are opposite;

the control end of the output module is connected with the signal input end, the input end of the output module is connected with the first node, and the output end of the output module is connected with the fingerprint identification chip; and the output module is used for driving the fingerprint identification chip to perform fingerprint identification according to the potential of the first node under the control of the signal input end.

4. The organic electroluminescent display device according to claim 3, wherein the data writing module comprises a first switching transistor; wherein,

the grid electrode of the first switch transistor is connected with the scanning line, the source electrode of the first switch transistor is connected with the data line, and the drain electrode of the first switch transistor is connected with the control end of the driving module.

5. The organic electroluminescent display device according to claim 4, wherein the driving module includes a second switching transistor and a capacitor; wherein,

the grid electrode of the second switch transistor is connected with the drain electrode of the first switch transistor, the source electrode of the second switch transistor is connected with the first node, and the drain electrode of the second switch transistor is connected with the anode of the organic electroluminescent structure;

and two ends of the capacitor are respectively connected with the grid electrode and the source electrode of the second switch transistor.

6. The organic electroluminescent display device according to claim 5, wherein the switching module comprises a third switching transistor, a fourth switching transistor, a fifth switching transistor, and a sixth switching transistor; wherein,

the grid electrode of the third switching transistor is connected with the signal input end, the source electrode of the third switching transistor is connected with the high-level signal end, and the drain electrode of the third switching transistor is connected with the first node;

the grid electrode of the fourth switching transistor is connected with the signal input end, the source electrode of the fourth switching transistor is connected with the low-level signal end, and the drain electrode of the fourth switching transistor is connected with the second node;

the grid electrode of the fifth switching transistor is connected with the signal input end, the source electrode of the fifth switching transistor is connected with the low-level signal end, and the drain electrode of the fifth switching transistor is connected with the first node;

and the grid electrode of the sixth switching transistor is connected with the signal input end, the source electrode of the sixth switching transistor is connected with the high-level signal end, and the drain electrode of the sixth switching transistor is connected with the second node.

7. The organic electroluminescent display device according to claim 6, wherein the output module includes a seventh switching transistor; wherein,

and the grid electrode of the seventh switching transistor is connected with the signal input end, the source electrode of the seventh switching transistor is connected with the first node, and the drain electrode of the seventh switching transistor is connected with the fingerprint identification chip.

8. The organic electroluminescent display device according to claim 7, wherein the third switching transistor and the fourth switching transistor are both N-type transistors; the first, second, fifth, sixth, and seventh switching transistors are all P-type transistors.

9. The organic electroluminescent display device according to claim 8, wherein the first node is kept at a low potential and the second node is kept at a high potential during the fingerprint identification period;

in the normal display period, the first node is kept at a high potential, and the second node is kept at a low potential.

10. The organic electroluminescent display device according to claim 9, wherein the first switching transistor and the second switching transistor are located in a region surrounded by the scan line and the data line.

11. The organic electroluminescent display device according to claim 10, further comprising: a printed circuit board and a flexible circuit board;

the third switching transistor, the fourth switching transistor, the fifth switching transistor, the sixth switching transistor, and the seventh switching transistor are all located on the printed circuit board or the flexible circuit board.

12. The organic electroluminescent display device according to claim 11, further comprising: the main board is connected with the flexible circuit board;

the fingerprint identification chip is located on the mainboard.