CN108155222B - Organic electroluminescent display device - Google Patents
Organic electroluminescent display device Download PDFInfo
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- CN108155222B CN108155222B CN201810095783.4A CN201810095783A CN108155222B CN 108155222 B CN108155222 B CN 108155222B CN 201810095783 A CN201810095783 A CN 201810095783A CN 108155222 B CN108155222 B CN 108155222B
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- 239000000758 substrate Substances 0.000 claims description 20
- 238000005401 electroluminescence Methods 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
- H10K59/65—OLEDs integrated with inorganic image sensors
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- Human Computer Interaction (AREA)
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The application discloses an organic electroluminescent display device, including: 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; the organic electroluminescent structure is used for normally emitting light 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 far away from the organic electroluminescent structure and used for providing a light source for a finger of a user, and the fingerprint identification chip is electrically connected with the photosensitive element; and the fingerprint identification chip is used for identifying the fingerprint pattern of the finger of the user according to the image information collected by the photosensitive element. This application utilizes organic electroluminescence structure to have photodiode's characteristic under the reverse bias state, adopts the timesharing drive to realize showing and fingerprint identification function with organic electroluminescence structure, compares in traditional display device, has reduced mutual interference, has increased the sensing semaphore, and has reduced module thickness and cost of manufacture.
Description
Technical Field
The invention relates to the technical field of display, in particular to an organic electroluminescent display device.
Background
Organic electroluminescent displays (OLEDs) are one of the hot spots in the research field of flat panel displays, and compared with liquid crystal displays, OLEDs have excellent properties such as low power consumption, high color saturation, wide viewing angle, thin thickness, fast response speed, and flexibility.
In order to have the fingerprint identification function, as shown in fig. 1, a fingerprint identification module 02 including a photosensitive element, an LED and a fingerprint identification chip is generally hung outside the lower substrate of the OLED display 01, and the conventional structure needs to add additional space and materials, which may cause the space of the entire module to be increased, the thickness to be increased and the cost to be increased, and if the photosensitive element is disposed below the lower substrate, the light reflected by the finger needs to penetrate through the lower substrate, and the signal quantity will be attenuated again.
Therefore, under the trend of high screen ratio of the smart phone, how to solve the problems of increased space and thickness of the OLED module, increased manufacturing cost, and insufficient sensing signal amount due to the introduction of the fingerprint recognition function is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an organic electroluminescent display device, which increases the sensing signal amount and reduces the module thickness and the manufacturing cost. The specific scheme is as follows:
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;
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.
Preferably, in the organic electroluminescent display device provided in an embodiment of the present invention, the organic electroluminescent display device further includes: 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.
Preferably, in the organic electroluminescent display device provided in an 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 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.
Preferably, in the above organic electroluminescent display device provided by an embodiment of the present invention, the data writing module includes 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.
Preferably, in the above organic electroluminescent display device provided by an embodiment of the present invention, 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.
Preferably, in the above 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 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.
Preferably, in the above organic electroluminescent display device provided by an embodiment of the present invention, 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.
Preferably, in the above organic electroluminescent display device provided by an embodiment of the present invention, 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.
Preferably, in the above organic electroluminescent display device according to an embodiment of the present invention, during the fingerprint identification period, the first node maintains a low potential, and the second node maintains a high potential;
in the normal display period, the first node is kept at a high potential, and the second node is kept at a low potential.
Preferably, in the above organic electroluminescent display device according to an embodiment of the present invention, the first switching transistor and the second switching transistor are located in a region surrounded by the scan line and the data line.
Preferably, in the organic electroluminescent display device provided in an embodiment of the present invention, the organic electroluminescent display device further includes: 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.
Preferably, in the organic electroluminescent display device provided in an embodiment of the present invention, the organic electroluminescent display device further includes: the main board is connected with the flexible circuit board;
the fingerprint identification chip is located on the mainboard.
The present invention provides 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; the organic electroluminescent structure is used for normally emitting light 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 far away from the organic electroluminescent structure and used for providing a light source for a finger of a user, and the fingerprint identification chip is electrically connected with the photosensitive element; and the fingerprint identification chip is used for identifying the fingerprint pattern of the finger of the user according to the image information collected by the photosensitive element. The invention utilizes the characteristic that the organic electroluminescent structure has the photosensitive diode in the reverse bias state, and the organic electroluminescent structure adopts time-sharing driving to realize the functions of display and fingerprint identification, thereby reducing the mutual interference, increasing the sensing signal quantity, and reducing the thickness of the module and the manufacturing cost compared with the traditional display device.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural view of an organic electroluminescent display device in the prior art;
fig. 2 is a schematic structural diagram of an organic electroluminescent display device according to an embodiment of the present invention;
FIG. 3 is a graph showing a current-voltage relationship of an organic electroluminescent display device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a control circuit according to an embodiment of the present invention;
FIG. 5 is a circuit timing diagram of the control circuit shown in FIG. 4.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention provides an organic electroluminescent display device, as shown in fig. 2, comprising: a substrate base plate 1, an organic electroluminescent structure 2 positioned on the substrate base plate 1;
the organic electroluminescent structure 2 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 3 is positioned on one side of the substrate base plate 1, which is far away from the organic electroluminescent structure 2, and is used for providing a light source for a finger of a user, and the fingerprint identification chip 4 is electrically connected with the photosensitive element;
and the fingerprint identification chip 4 is used for identifying the fingerprint pattern of the finger of the user according to the image information collected by the photosensitive element.
In the organic electroluminescent display device provided in the embodiment of the present invention, by using the characteristic that the organic electroluminescent structure has a photosensitive diode in a reverse bias state, the organic electroluminescent structure is driven in a time-sharing manner to realize the display and fingerprint identification functions, as shown in fig. 3, in a normal display time period, when the voltage is positive, the organic electroluminescent structure emits light normally; at the fingerprint identification time quantum, when the voltage is the burden, organic electroluminescent structure realizes fingerprint identification as photosensitive element under the shining of light source, compares in traditional display device, has reduced mutual interference, has increased sensing semaphore, and has reduced module thickness and cost of manufacture.
It should be noted that the organic electroluminescent display device provided in the embodiment of the present invention may further include: the organic electroluminescent display device comprises a packaging layer for packaging an organic electroluminescent structure, a printed circuit board and a flexible circuit board connected with the organic electroluminescent structure, other structures such as a display driving chip and the like on the printed circuit board, and a substrate, wherein the substrate is also generally provided with structures such as a thin film transistor, a grid line, a data line and the like, and the specific structures can be realized in various ways and are not limited herein. In addition, as shown in fig. 2, the organic electroluminescent display device may further include: a main board connected with the flexible circuit board; the fingerprint identification chip 4 may be located on the motherboard.
In a specific implementation, in the organic electroluminescent display device provided in an embodiment of the present invention, in order to ensure that the organic electroluminescent structure is driven in a time-sharing manner to achieve the display and fingerprint recognition functions, a control circuit, which is equivalent to a switch, may be added to a power supply for supplying a current to the organic electroluminescent structure, where the switch is used to switch between the normal display mode and the fingerprint recognition mode, and the organic electroluminescent display device further includes: 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 a normal display time period; and the organic electroluminescent structure is also used for applying reverse bias voltage to the organic electroluminescent structure in a fingerprint identification time period to drive the fingerprint identification chip to identify fingerprints.
Specifically, in the organic electroluminescent display device provided in 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 end of the data writing module 100 is connected with the scanning line, the input end is connected with the data line, and the output end is connected with the control end of the driving module 200; the data writing module 100 is configured to provide a data signal output by a data line to a control end of the driving module 200 when the scan line outputs a scan signal;
the input end of the driving module 200 is connected with the first node a, and the output end is connected with the anode of the organic electroluminescent structure; the cathode of the organic electroluminescent structure is connected with the second node B; the driving module 200 is configured to drive the organic electroluminescent structure to emit light according to the potential of the first node a under the control of the data signal;
a control end of the switching module 300 is connected with a signal input end, an input end is respectively connected with a high-level signal end OVDD and a low-level signal end OVSS, and an output end is respectively connected with a first node a and a second node B; a switching module 300, configured to switch potentials of the first node a and the second node B according to 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 potentials of the first node A and the second node B are opposite;
the control end of the output module 400 is connected with the signal input end, the input end is connected with the first node A, and the output end is connected with the fingerprint identification chip; and the output module 400 is used for driving the fingerprint identification chip to perform fingerprint identification according to the potential of the first node a under the control of the signal input end.
The present invention will be described in detail with reference to specific examples. It should be noted that the present embodiment is intended to better explain the present invention, but not to limit the present invention.
In particular implementation, as shown in fig. 4, the data writing module 100 may include a first switching transistor T1; the gate of the first switching transistor T1 is connected to the scan line, the source is connected to the data line, and the drain is connected to the control terminal of the driving module 200.
Specifically, as shown in fig. 4, the first switching transistor T1 may be a P-type transistor, and at this time, when the scan signal output by the scan line is at a low potential, the first switching transistor T1 is in an on state, and when the scan signal output by the scan line is at a high potential, the first switching transistor T1 is in an off state. When the first switching transistor T1 is in a conducting state, the data signal output from the data line is transmitted to the control terminal of the driving module 200 through the first switching transistor T1, thereby controlling whether the driving module 200 is conducting.
The above is merely an example of the specific structure of the data writing module in the control circuit, and in the specific implementation, the specific structure of the data writing module is not limited to the above structure provided by the embodiment of the present invention, and may also be other structures known to those skilled in the art, which is not limited herein.
In a specific implementation, as shown in fig. 4, the driving module 200 may include a second switching transistor T2 and a capacitor C; wherein the gate electrode of the second switching transistor T2 is connected to the drain electrode of the first switching transistor T1, the source electrode is connected to the first node a, and the drain electrode is connected to the anode electrode of the organic electroluminescent structure; both ends of the capacitor C are connected to the gate and source of the second switching transistor T2, respectively.
Specifically, as shown in fig. 4, the second switching transistor T2 may be a P-type transistor, and at this time, the second switching transistor T2 is turned on when the data signal output from the data line is low, and the second switching transistor T2 is turned off when the data signal output from the data line is high. When the second switching transistor T2 is in a conducting 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 anode of the organic electroluminescent structure through the second switching transistor T2, and the cathode of the organic electroluminescent structure is at a low level, so as to drive the organic electroluminescent structure to emit light; if the potential of the first node a is low and the potential of the second node B is high, the low level 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 high, the organic electroluminescent structure does not emit light and can be used as a light sensing element in a reverse bias state, thereby implementing fingerprint identification.
The above is merely an example of the specific structure of the driving module in the control circuit, and in the specific implementation, the specific structure of the driving module is not limited to the above structure provided by the embodiment of the present invention, and may be other structures known to those skilled in the art, and is not limited herein.
In particular implementation, as shown in fig. 4, the switching module 300 may include a third switching transistor T3, a fourth switching transistor T4, a fifth switching transistor T5, and a sixth switching transistor T6; the gate of the third switching transistor T3 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 first node a; the gate of the fourth switching transistor T4 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 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 has a gate connected to the signal input terminal, a source connected to the high-level signal terminal OVDD, and a drain connected to the second node B.
Specifically, as shown in fig. 4, the third switching transistor T3 and the fourth switching transistor T4 may be both N-type transistors, and at this time, when the signal output from the signal input terminal is at a high potential, the third switching transistor T3 and the fourth switching transistor T4 are in an on state, and when the signal output from the signal input terminal is at a low potential, the third switching transistor T3 and the fourth switching transistor T4 are in an off state; when the third switching transistor T3 and the fourth switching transistor T4 are turned on, the potential of the first node a is high, and the potential of the second node B is low, and the organic electroluminescent structure emits light. The fifth switching transistor T5 and the sixth switching transistor T6 may be both P-type transistors, in which case, when the signal output from the signal input terminal is at a low potential, the fifth switching transistor T5 and the sixth switching transistor T6 are in an on state, and when the signal output from 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 at a low potential, and the potential of the second node B is at a high potential, at this time, the organic electroluminescent structure does not emit light, and can be used as a photosensitive element in a reverse bias state, thereby realizing fingerprint identification.
The above is merely to illustrate a specific structure of the switching module in the control circuit, and in a specific implementation, the specific structure of the switching module is not limited to the above structure provided by the embodiment of the present invention, and may also be other structures known by those skilled in the art, and is not limited herein.
In particular implementation, as shown in fig. 4, the output module 400 may include a seventh switching transistor T7; 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 fingerprint identification chip.
Specifically, as shown in fig. 4, the seventh switching transistor T7 may be a P-type transistor, and 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, the seventh switching transistor T7 is in an off state. When the seventh switching transistor T7 is in a conducting state, information collected by the photosensitive element can be transmitted to the fingerprint identification chip through the seventh switching transistor T7, so as to drive the fingerprint identification chip to realize fingerprint identification.
The above is merely an example of the specific structure of the output module in the control circuit, and in the specific implementation, the specific structure of the output module is not limited to the above structure provided by the embodiment of the present invention, and may be other structures known to those skilled in the art, and is not limited herein.
The operation of the control circuit according to the embodiment of the present invention is described below by taking the structure of the control circuit shown in fig. 4 as an example, wherein in the control circuit shown in fig. 4, the third switching transistor T3 and the fourth switching transistor T4 may be both N-type transistors; the first switching transistor T1, the second switching transistor T2, the fifth switching transistor T5, the sixth switching transistor T6, and the seventh switching transistor T7 may all be P-type transistors. Each N-type transistor is switched on under the action of high potential and is switched off under the action of low potential; the P-type transistors are turned on at a low potential and turned off at a high potential.
The corresponding input timing diagram is shown in fig. 5, and specifically, two stages of the fingerprint identification 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 denotes a high potential, and 0 denotes a low potential.
In the fingerprint identification time period: the signal output by the signal input end keeps low potential;
since the signal output from the signal input terminal maintains the low level, the fifth switching transistor T5, the sixth switching transistor T6, and the seventh switching transistor T7 are turned on, and the third switching transistor T3 and the fourth switching transistor T4 are turned off, at this time, the high level of the high level signal terminal OVDD is transmitted to the second node B through the sixth switching transistor T6, resulting in that the second node B maintains the high level; the low level of the low level signal terminal OVSS is transmitted to the first node a through the fifth switch transistor T5, so that the first node a keeps a low potential, and since the first node a is a low potential, the second node B is a high potential, the anode of the organic electroluminescent structure is a low potential, the cathode of the organic electroluminescent structure is a high potential, the organic electroluminescent structure does not emit light, and can be used as a photosensitive element in a reverse bias state, and the photosensitive element transmits the acquired information to the fingerprint identification chip through the seventh switch transistor T7, thereby realizing fingerprint identification.
In the normal display period: the signal output by the signal input end keeps high potential;
since the signal output from the signal input terminal maintains the high potential, the fifth, sixth, and seventh switching transistors T5, T6, and T7 are in an off state, and the third and fourth switching transistors T3 and T4 are in an on state, at which time, 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 the high potential; the low level of the low level signal terminal OVSS is transmitted to the second node B through the fourth switching transistor T4, which causes the second node B to keep a low level, and since the first node a is at a high level and the second node B is at a low level, the anode of the organic electroluminescent structure is at a high level and the cathode of the organic electroluminescent structure is at a low level, the organic electroluminescent structure normally displays luminescence.
In practical implementation, in the above-described organic electroluminescent display device provided by an embodiment of the present invention, the first switching transistor T1 and the second switching transistor T2 may be located in an area surrounded by the scan line and the data line. The third, fourth, fifth, sixth, and seventh switching transistors T3, T4, T5, T6, and T7 may all be located on a printed circuit board or a flexible circuit board, and of course, may all be located within a region surrounded by the scan line and the data line. The specific positions of the third, fourth, fifth, sixth, and seventh switching transistors T3, T4, T5, T6, and T7 may be determined according to practical situations, and are not limited herein.
An organic electroluminescence display device provided in an embodiment of the present invention includes: 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; the organic electroluminescent structure is used for normally emitting light 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 far away from the organic electroluminescent structure and used for providing a light source for a finger of a user, and the fingerprint identification chip is electrically connected with the photosensitive element; and the fingerprint identification chip is used for identifying the fingerprint pattern of the finger of the user according to the image information collected by the photosensitive element. The invention utilizes the characteristic that the organic electroluminescent structure has the photosensitive diode in the reverse bias state, and the organic electroluminescent structure adopts time-sharing driving to realize the functions of display and fingerprint identification, thereby reducing the mutual interference, increasing the sensing signal quantity, and reducing the thickness of the module and the manufacturing cost compared with the traditional display device.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The organic electroluminescent display device provided by the present invention is described in detail above, and the principle and the embodiment of the present invention are explained herein by using specific examples, and the above description of the examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
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.
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