CN110364114B - Display panel, brightness compensation method thereof and display device - Google Patents
Display panel, brightness compensation method thereof and display device Download PDFInfo
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- 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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Abstract
The embodiment of the invention provides a display panel, a brightness compensation method thereof and a display device, relates to the technical field of display, and aims to improve brightness attenuation caused by aging. The display panel comprises a display area and a non-display area, wherein the display area is provided with a first light-emitting element; the light sensing detection unit comprises a second light-emitting element of the non-display area and a detection module; the second light-emitting element has the same light-emitting state as the first light-emitting element; the detection module includes: the initialization submodule is connected with the first control signal end, the first reference signal end, the high-level signal end, the first node and the second node; the photosensitive element is connected with the first fixed signal end and the first node; the feedback submodule is connected with the second control signal terminal, the second reference signal terminal, the first fixed signal terminal, the second fixed signal terminal, the first node, the second node and the third node; the output submodule is connected with the second control signal end, the third node and the output signal line; and the compensation unit is connected with the output submodule and the first light-emitting element.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of display, in particular to a display panel, a brightness compensation method thereof and a display device.
[ background of the invention ]
Compared with a liquid crystal display panel, an Organic Light-Emitting Diode (OLED) display panel has advantages in brightness, chromaticity, and power consumption, and is widely used. However, as the OLED display panel is used for a long time, the light emitting elements in the OLED display panel may be degraded, so that the actual display brightness of the OLED display panel is lower than the target display brightness, and the color of the picture displayed by the OLED display panel may be deviated.
However, the compensation method in the prior art, such as real-time monitoring compensation and pre-estimation compensation, is not accurate, and cannot better improve the display performance.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a display panel, a brightness compensation method thereof, and a display device, which can accurately compensate for a light emitting element, improve brightness attenuation caused by aging of the light emitting element, and improve display performance.
In one aspect, an embodiment of the present invention provides a display panel, including:
the display device comprises a display area and a non-display area surrounding the display area, wherein a first light-emitting element is arranged in the display area;
the light sensing detection unit comprises a second light emitting element and a detection module; the second light-emitting element is positioned in the non-display area, and the light-emitting state of the second light-emitting element is the same as that of the first light-emitting element;
the detection module comprises an initialization submodule, a photosensitive element, a feedback submodule and an output submodule;
the initialization submodule is respectively electrically connected with a first control signal end, a first reference signal end, a high-level signal end, a first node and a second node and is used for providing a first reference signal for the first node and providing a high-level signal for the second node;
the photosensitive element is respectively electrically connected with the first fixed signal end and the first node, and is used for sensing the optical signal of the second light-emitting element and transmitting the photocurrent signal converted by the optical signal to the first node;
the feedback submodule is respectively electrically connected with a second control signal terminal, a second reference signal terminal, the first fixed signal terminal, a second fixed signal terminal, the first node, the second node and a third node and is used for feeding back a voltage signal of the first node to the third node;
the output submodule is electrically connected with the second control signal terminal, the third node and the output signal line respectively and is used for transmitting the voltage signal of the third node to the output signal line;
and the compensation unit is respectively electrically connected with the output submodule and the first light-emitting element and is used for acquiring a compensation signal according to the voltage signal output by the output submodule and compensating the light-emitting brightness of the first light-emitting element according to the compensation signal.
Optionally, the display area includes n sub-display areas, the display panel includes n light-sensing detection units, and n is a positive integer greater than 1;
the second light emitting element in one of the light sensing units and the first light emitting element in one of the sub-display regions emit light in the same state.
On the other hand, an embodiment of the present invention provides a method for compensating brightness of a display panel, which is applied to the display panel, and includes:
controlling the second light-emitting element to emit light in the same light-emitting state as the first light-emitting element;
in the first stage, the initialization submodule of the light sensing detection unit provides the first reference signal for the first node and provides the high level signal for the second node;
a second stage, in which the light sensing element senses an optical signal of the second light emitting element and transmits a photocurrent signal converted by the optical signal to the first node;
in a third stage, the feedback submodule feeds the voltage signal of the first node back to the third node, and the output submodule transmits the voltage signal of the third node to the output signal line;
and in the fourth stage, the compensation unit acquires a compensation signal according to the voltage signal output by the output submodule, and compensates the light-emitting brightness of the first light-emitting element according to the compensation signal.
In another aspect, an embodiment of the present invention provides a display device, including the display panel described above.
One of the above technical solutions has the following beneficial effects:
in the technical solution provided by the embodiment of the present invention, by arranging the second light emitting element in the non-display area and making the light emitting state of the second light emitting element the same as that of the first light emitting element, it can be ensured that the aging degree of the second light emitting element is the same as that of the first light emitting element, and further, by detecting the light emitting brightness of the second light emitting element, the brightness attenuation degree of the first light emitting element can be accurately fed back. With such an arrangement, the photosensitive element does not need to directly detect the light intensity of the first light-emitting element, and the light emitted by the first light-emitting element only needs to be emitted from the light-emitting surface of the display panel and does not need to be transmitted to the photosensitive element along other directions, so that the structure of the first light-emitting element does not need to be changed, for example, the anode layer of the second light-emitting element is set as a transparent anode layer, the light-emitting brightness of the second light-emitting element is detected, the structure of the first light-emitting element does not need to be changed, further, the influence of illumination on the first light-emitting element and peripheral circuits is avoided, and the normal light emission of the first light-emitting element is ensured. And based on the working principle of the detection module, when the luminance of the second light-emitting element is detected, the magnitude of the voltage signal of the first node can accurately feed back the luminance of the second light-emitting element, and the magnitude of the voltage signal of the first node can also be accurately fed back through the voltage signal of the third node, so that after the compensation unit obtains the voltage signal of the third node, the luminance attenuation degree of the second light-emitting element (the first light-emitting element) can be accurately judged, the first light-emitting element is accurately compensated, the luminance attenuation caused by the aging of the first light-emitting element is improved, the target luminance value is displayed, and the display performance of the display panel is improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a top view of a display panel according to an embodiment of the invention;
fig. 2 is a partial cross-sectional view of a display panel according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a detection module according to an embodiment of the present invention;
FIG. 4 is a top view of a display panel according to an embodiment of the present invention;
fig. 5 is another partial cross-sectional view of a display panel according to an embodiment of the invention;
FIG. 6 is a timing diagram of signals provided by an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a compensation unit according to an embodiment of the present invention;
FIG. 8 is a flowchart illustrating a brightness compensation method according to an embodiment of the present invention;
FIG. 9 is a flowchart illustrating a brightness compensation method according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all 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 terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Fig. 1 to 3 show a display panel, where fig. 1 is a top view of the display panel provided by the embodiment of the present invention, fig. 2 is a partial cross-sectional view of the display panel provided by the embodiment of the present invention, fig. 3 is a schematic structural diagram of a detection module provided by the embodiment of the present invention, the display panel includes a display area 1 and a non-display area 2 surrounding the display area 1, and a first light emitting element 3 is disposed in the display area 1. The display panel further comprises at least one light sensing unit 4, and the light sensing unit 4 comprises a second light emitting element 5 and a detection module 6; wherein the second light emitting element 5 is located in the non-display region 2, and the light emitting state of the second light emitting element 5 is the same as that of the first light emitting element 3.
The detection module 6 comprises an initialization submodule 7, a light sensing element 8, a feedback submodule 9 and an output submodule 10. The initialization submodule 7 is electrically connected to the first control signal terminal Vck1, the first reference signal terminal Vref1, the high level signal terminal VGH, the first node N1 and the second node N2, respectively, and is configured to provide a first reference signal to the first node N1 and provide a high level signal to the second node N2; the light sensing element 8 is electrically connected to the first fixed signal terminal VDD and the first node N1, respectively, and is configured to sense an optical signal of the second light emitting element 5 and transmit a photocurrent signal converted from the optical signal to the first node N1; the feedback submodule 9 is electrically connected to a second control signal terminal Vck2, a second reference signal terminal Vref2, a first fixed signal terminal VDD, a second fixed signal terminal VEE, a first node N1, a second node N2 and a third node N3 respectively, and is configured to feed back a voltage signal of the first node N1 to the third node N3; the output submodule 10 is electrically connected to the second control signal terminal Vck2, the third node N3 and the output signal line OL, respectively, for transmitting the voltage signal of the third node N3 to the output signal line OL.
The display panel further comprises a compensation unit 11, and the compensation unit 11 is electrically connected to the output sub-module 10 and the first light-emitting element 3 respectively, and is configured to obtain a compensation signal according to the voltage signal output by the output sub-module 10, and compensate the light-emitting brightness of the first light-emitting element 3 according to the compensation signal.
Specifically, when the display panel displays a screen, the first light-emitting elements 3 of the display area 1 and the second light-emitting elements 5 of the non-display area 2 are controlled to emit light, and the light-emitting states of the second light-emitting elements 5 are made the same as the light-emitting states of the first light-emitting elements 3.
In the first phase, the initialization submodule 7 writes the first reference signal provided by the first reference signal terminal Vref1 into the first node N1, and simultaneously writes the high level signal provided by the high level signal terminal VGH into the second node N2, thereby realizing the potential initialization of the first node N1 and the second node N2.
In the second phase, the light sensing element 8 senses the optical signal of the second light emitting element 5 and converts the sensed optical signal into a photo current signal, which flows to the first node N1, raising the potential of the first node N1. The magnitude of the photocurrent signal is related to the light-emitting luminance of the second light-emitting element 5, and the higher the light-emitting luminance of the second light-emitting element 5 is, the larger the photocurrent signal is, and the larger the increase degree of the potential of the first node N1 is.
In the third stage, the feedback sub-module 9 controls the voltage signal of the third node N3 to increase with the increase of the voltage signal of the first node N1, and then the magnitude of the voltage signal of the first node N1 is fed back according to the magnitude of the voltage signal of the third node N3.
In the fourth stage, the compensation unit 11 obtains the light-emitting brightness of the second light-emitting element 5 according to the magnitude of the voltage signal of the third node N3, and further obtains the brightness attenuation degree of the second light-emitting element 5 (the first light-emitting element 3), and further obtains a compensation signal according to the brightness attenuation degree, and compensates the first light-emitting element 3, so that the actual light-emitting brightness of the first light-emitting element 3 is equal to the target light-emitting brightness.
It can be seen that in the display panel provided in the embodiment of the present invention, the second light emitting element 5 is disposed in the non-display area 2, and the light emitting state of the second light emitting element 5 is the same as that of the first light emitting element 3, so that the aging degree of the second light emitting element 5 can be ensured to be consistent with that of the first light emitting element 3, and further, the brightness attenuation degree of the first light emitting element 3 can be accurately fed back by detecting the brightness of the second light emitting element 5. With such an arrangement, the light sensing element 8 does not need to directly detect the light intensity of the first light emitting element 3, and the light emitted by the first light emitting element 3 only needs to be emitted through the light emitting surface of the display panel, and does not need to be transmitted to the light sensing element 8 along other directions, so that the structure of the first light emitting element 3 does not need to be changed, for example, the anode layer of the second light emitting element 5 is set as a transparent anode layer, and the light emitting brightness of the second light emitting element is detected, so that the structure of the first light emitting element does not need to be changed, further, the influence of illumination on the first light emitting element 3 and peripheral circuits is avoided, and the normal light emitting of the first light emitting element 3 is ensured; meanwhile, the luminance of the first light-emitting element 3 is reflected by detecting the luminance of the second light-emitting element 5, compared with the case of directly detecting the luminance of the first light-emitting element 3, the luminance of the first light-emitting element 3 has higher detection precision, the light emission of the first light-emitting element 3 is mainly used for displaying, if the luminance of the first light-emitting element 3 is directly detected, only most of the light emission is used for displaying, and a small part of the light emission is used for detecting, and when the luminance of the second light-emitting element 5 with the same luminance as the first light-emitting element 3 is detected, the light emission of the second light-emitting element 5 can be completely used for detecting, and at the moment, the light-sensitive element detects more light. Moreover, based on the working principle of the detection module 6, when the light-emitting brightness of the second light-emitting element 5 is detected, the magnitude of the voltage signal of the first node N1 can accurately feedback the light-emitting brightness of the second light-emitting element 5, and the magnitude of the voltage signal of the first node N1 can also be accurately fed back by the voltage signal of the third node N3, so that after the compensation unit 11 obtains the voltage signal of the third node N3, the brightness attenuation degree of the second light-emitting element 5 (the first light-emitting element 3) can be accurately determined, and the first light-emitting element 3 is accurately compensated, so that the brightness attenuation caused by aging of the first light-emitting element 3 is improved, the target brightness value is displayed, and the display performance of the display panel is improved.
It can be understood that, in the picture displayed by the display panel, the picture displayed by different areas is different, that is, the first light emitting elements 3 in different areas have different display periods and different display luminances, and the attenuation degrees are different. Based on this, as shown in fig. 4, fig. 4 is another top view of the display panel provided in the embodiment of the present invention, the display area 1 includes n sub-display areas 12, the display panel includes n light-sensitive detection units 4, n is a positive integer greater than 1; the second light emitting element 5 in one light sensing unit 4 has the same light emitting state as the first light emitting element 3 in one sub display region 12. That is, n sub-display regions 12 correspond to n photo-sensing units 4 one-to-one, and the light emitting states of the second light emitting elements 5 in each photo-sensing unit 4 and the first light emitting elements 3 in the sub-display region 12 corresponding thereto are the same. By the arrangement, the brightness attenuation degree of the first light-emitting element 3 in each sub-display area 12 can be separately detected, and then the first light-emitting elements 3 in different sub-display areas 12 are separately compensated, so that the detection and compensation accuracy is improved, the first light-emitting elements 3 in different areas of the display area 1 can display the target brightness value, and the display effect is further improved.
It is understood that the display area 1 includes a plurality of colors of the first light emitting elements 3 in order to realize a plurality of colors of picture display. Based on this, each light sensing unit 4 includes the second light emitting elements 5 of a plurality of colors, and the second light emitting elements 5 in one light sensing unit 4 emit light in the same state as the first light emitting elements 3 of the same color.
Illustratively, the first light emitting elements 3 include red, green and blue first light emitting elements 3, and accordingly, each light sensation detecting unit 4 includes a red second light emitting element 5, a green second light emitting element 5 and a blue second light emitting element 5, wherein the light emitting state of the red second light emitting element 5 is the same as the light emitting state of the red first light emitting element 3, the light emitting state of the green second light emitting element 5 is the same as the light emitting state of the green first light emitting element 3, and the light emitting state of the blue second light emitting element 5 is the same as the light emitting state of the blue first light emitting element 3. Because the material properties of the light emitting layers of the light emitting elements with different colors are different and the decay rates are different, the light emitting states of the second light emitting element 5 and the first light emitting element 3 with the same color are the same, the brightness decay degrees of the first light emitting elements 3 with different colors can be detected independently, and the detection accuracy is improved.
In addition, in order to further improve the detection and compensation accuracy, please refer to fig. 4 again, n sub-display regions 12 correspond to n photo-sensing units 4 one by one, each photo-sensing unit 4 includes a plurality of colors of second light-emitting elements 5, and the light-emitting states of the second light-emitting elements 5 in one photo-sensing unit 4 and the first light-emitting elements 3 of the same color in the corresponding sub-display region 12 are the same.
Alternatively, referring to fig. 2 again, the second light emitting element 5 includes a cathode layer 13, a light emitting layer 14, and a transparent anode layer 15. When the anode layer of the second light emitting element 5 is the transparent anode layer 15, the light emitted from the light emitting layer 14 can be diffused along different directions, so that the light sensing element 8 can receive enough light, and the light emitting intensity of the second light emitting element 5 can be detected more accurately.
Optionally, referring to fig. 2 again, the photosensitive element 8 is located on a side of the second light emitting element 5 facing away from the light emitting surface of the display panel. In the film layer structure of the display panel, the film layer where the circuit is located is usually located on the side of the film layer where the light-emitting element is located, which faces away from the light-emitting surface of the display panel, and the photosensitive element 8 is arranged on the side of the second light-emitting element 5, which faces away from the light-emitting surface, so that the distance between the photosensitive element 8 and the detection module 6 can be reduced, the length of the connecting wiring between the photosensitive element 8 and the detection module 6 is reduced, and the space occupied by the connecting wiring in the non-display area 2 is reduced.
It should be noted that, in other alternative embodiments of the present invention, the photosensitive element 8 may also be disposed on a side of the second light-emitting element 5 facing the light-emitting surface of the display panel, and specifically may be disposed on the display panel in an external hanging manner.
Optionally, as shown in fig. 5, fig. 5 is another partial cross-sectional view of the display panel provided in the embodiment of the present invention, and the display panel further includes a light shielding layer 16, where the light shielding layer 16 is located on a side of the second light emitting element 5 facing the light emitting surface of the display panel. The light emitted from the second light-emitting element 5 is shielded by the light-shielding layer 16, so that the interference of the light to the light emitted from the first light-emitting element 3 and the influence on the normal display can be avoided. Meanwhile, due to the light shielding layer 16, the photosensitive element 8 is disposed on the side of the second light emitting element 5 opposite to the light exit surface or on the side of the second light emitting element 5 facing the light exit surface of the display panel, which will not interfere with normal display, so the specific position of the photosensitive element 8 can be set according to actual needs, and the invention is not limited thereto.
Optionally, referring again to fig. 3, the initialization submodule 7 includes a first transistor T1 and a second transistor T2; a gate of the first transistor T1 is electrically connected to the first control signal terminal Vck1, a first pole of the first transistor T1 is electrically connected to the first reference signal terminal Vref1, and a second pole of the first transistor T1 is electrically connected to the first node N1; a gate of the second transistor T2 is electrically connected to the first control signal terminal Vck1, a first pole of the second transistor T2 is electrically connected to the high level signal terminal VGH, and a second pole of the second transistor T2 is electrically connected to the second node N2.
Referring to fig. 6, fig. 6 is a signal timing diagram according to an embodiment of the invention, in a first phase T1, a first control signal provided by the first control signal terminal Vck1 is at a low level, the first transistor T1 and the second transistor T2 are turned on under the action of the low level, a first reference signal provided by the first reference signal terminal Vref1 is transmitted to the first node N1 through the turned-on first transistor T1, and a high level signal provided by the high level signal terminal VGH is transmitted to the second node N2 through the turned-on second transistor T2, so as to initialize the potentials of the first node N1 and the second node N2.
Optionally, referring again to fig. 3, the feedback sub-module 9 includes a third transistor T3, a fourth transistor T4, and a fifth transistor T5; a gate of the third transistor T3 is electrically connected to the second control signal terminal Vck2, a first pole of the third transistor T3 is electrically connected to the second reference signal terminal Vref2, and a second pole of the third transistor T3 is electrically connected to the second node N2; a gate of the fourth transistor T4 is electrically connected to the second node N2, a first pole of the fourth transistor T4 is electrically connected to the first fixed signal terminal VDD, and a second pole of the fourth transistor T4 is electrically connected to the third node N3; a gate of the fifth transistor T5, a gate of the fifth transistor T5 are electrically connected to the first node N1, a first pole of the fifth transistor T5 are electrically connected to the third node N3, and a second pole of the fifth transistor T5 are electrically connected to the second fixed signal terminal VEE.
Referring to fig. 6, in the third stage T3, the second control signal provided by the second control signal terminal Vck2 is at a low level, the third transistor T3 is turned on under the action of the low level, the second reference signal provided by the second reference signal terminal Vref2 is transmitted to the second node N2 through the turned-on third transistor T3, the fourth transistor T4 is in a saturation region under the action of the second reference signal and the fixed potential signal provided by the first fixed potential terminal, and the saturation leakage current I ═ μ ═ (1/2) of the fourth transistor T4 is (1/2)nCox(W4/L4)(Vref2-VDD-Vth)2，μnFor electron mobility, CoxIs a unit area gate oxide capacitance, W4/L4Is the width-to-length ratio, V, of the fourth transistor T4ref2Is a second reference signal, VDDIs a first fixed signal, VthThe saturation leakage current I is a constant value and is not related to the voltage signal of the third node N3, but only related to the second reference signal and the first fixed signal, and the fourth transistor T4 can be regarded as a constant current source. The saturated leakage current I of the fourth transistor T4 is transmitted to the fifth transistor T5, and under the action of the photocurrent signal, the voltage signal of the first node N1 gradually increases, so that the on state of the fifth transistor T5 gradually decreases, at this time, the fifth transistor T5 can be regarded as a source follower, and the source voltage of the fifth transistor T5 (the voltage signal V of the third node N3)N3) With the gate voltage (voltage signal V of the first node N1)N1) Is varied according to I ═ (1/2) μnCox(W5/L5)(VN3-VN1-Vth)2It can be known that W5/L5A voltage signal V of the third node N3 for a width-to-length ratio of the fifth transistor T5N3Following the voltage signal V of the first node N1N1Is raised so that the voltage signal of the first node N1 can be known from the voltage signal of the third node N3.
Based on the specific structure of the feedback sub-module 9, in the third stage, the fourth transistor T4 can be regarded as a constant current source, the fourth transistor T4 can provide a stable constant current I to the fifth transistor T5, and under the action of the voltage signal of the first node N1, the fifth transistor T5 can be regarded as a source follower, and the source voltage (the voltage signal of the third node N3) thereof increases with the increase of the gate voltage (the voltage signal of the first node N1), so that the magnitude of the voltage signal of the first node N1 can be accurately fed back according to the magnitude of the voltage signal of the third node N3.
Optionally, referring to fig. 3 again, the output sub-module 10 includes a sixth transistor T6, a gate of the sixth transistor T6 is electrically connected to the second control signal terminal Vck2, a first pole of the sixth transistor T6 is electrically connected to the third node N3, and a second pole of the sixth transistor T6 is electrically connected to the output signal line OL.
Referring to fig. 6, in the third stage T3, the second control signal provided by the second control signal terminal Vck2 is at a low level, the sixth transistor T6 is turned on under the action of the low level, and the voltage signal at the third node N3 is transmitted to the output signal line OL via the turned-on sixth transistor T6, and then transmitted to the compensation unit 11.
In addition, referring to fig. 3 again, the detection module 6 further includes a first capacitor C1 and a second capacitor C2; a first pole of the first capacitor is electrically connected with the first fixed signal terminal VDD, and a second pole of the first capacitor is electrically connected with the first node N1 for stabilizing the potential of the first node N1; the first pole of the second capacitor is electrically connected to the first fixed signal terminal VDD, and the second pole of the second capacitor is electrically connected to the second node N2 for stabilizing the potential of the second node N2. In addition, when the photocurrent signal converted by the light sensing element 8 is transmitted to the first node N1, the first capacitor can also stabilize the rising speed of the potential of the first node N1, thereby preventing the signal from being unstable due to the rapid rise of the potential of the first node N1.
Optionally, to ensure that the photosensitive element 8 has good photosensitive characteristics, the photosensitive element 8 includes a silicon-based PIN device, an indium gallium zinc oxide thin film transistor, a low-temperature polysilicon thin film transistor, or an amorphous silicon device.
Optionally, referring to fig. 1 again, the display region 1 is further provided with a Data line Data, and the Data line Data is electrically connected to the first light emitting element 3; the output signal line OL and the Data line Data are arranged on the same layer, in the manufacturing process, the output signal line OL and the Data line Data are formed by adopting a one-time composition process, and the output signal line OL does not need to adopt an additional composition process, so that the manufacturing flow is simplified, and the manufacturing cost is reduced.
Optionally, as shown in fig. 7, fig. 7 is a schematic structural diagram of a compensation unit provided in the embodiment of the present invention, and the compensation unit 11 includes an attenuation degree obtaining module 17, a regulation parameter obtaining module 18, and a digital-to-analog conversion module 19. The attenuation degree obtaining module 17 is electrically connected to the output submodule 10, and is configured to obtain an actual brightness attenuation percentage according to the voltage signal output by the output submodule 10; the control parameter obtaining module 18 is electrically connected to the attenuation degree obtaining module 17, and is configured to obtain a compensation control parameter corresponding to an actual brightness attenuation percentage according to a stored brightness attenuation percentage-control parameter mapping relationship; the digital-to-analog conversion module 19 is electrically connected to the control parameter obtaining module 18, the driving chip, and the first light emitting element 3, and is configured to convert the digital data signal provided by the driving chip into a compensation analog data signal according to the compensation control parameter, and transmit the compensation analog data signal to the first light emitting element 3 to compensate the light emitting brightness of the first light emitting element 3.
It should be noted that the digital-to-analog conversion module 19 is configured to convert the digital Data signals corresponding to the 0-255 gray scales provided by the driving chip into analog Data signals corresponding to the 0-255 gray scales, and transmit the converted analog digital signals to the corresponding first light emitting elements 3 through the Data lines Data. The conversion ratio between the digital data signal and the analog data signal is determined by a control parameter, that is, the converted analog data signals are different under the action of different control parameters for the digital data signals corresponding to the 0-255 gray scales, for example, for the same digital data signal, under the control of a first control parameter, the voltage range corresponding to the 0-255 gray scale in the analog data signal converted by the digital-to-analog conversion module 19 is V1-V2, and under the control of a second control parameter, the voltage range corresponding to the 0-255 gray scale in the analog data signal converted by the digital-to-analog conversion module 19 is V3-V4, V1 ≠ V3, and V2 ≠ V4. The control parameter may be a reference potential parameter.
Specifically, after the attenuation degree obtaining module 17 obtains the voltage signal of the third node N3, the actual brightness of the second light emitting element 5 (the first light emitting element 3) can be obtained according to the magnitude of the voltage signal of the third node N3, and then the actual brightness attenuation percentage of the first light emitting element 3 can be obtained. The control parameter obtaining module 18 further searches the pre-stored luminance attenuation percentage-control parameter mapping relationship according to the actual luminance attenuation percentage to obtain the control parameter corresponding to the actual luminance attenuation percentage, that is, the compensation control parameter. Further, the digital-to-analog conversion module 19 converts the digital data signal provided by the driving chip into a compensation analog data signal based on the compensation regulation and control parameter, so as to ensure that the actual luminance of the compensated first light-emitting element 3 is equal to the target luminance, thereby improving the display effect.
For example, when the first light emitting element 3 displays 255 grayscales, and the analog data voltage V5 corresponding to the 255 grayscales is supplied to the first light emitting element 3, theoretically, the target luminance value of light to be displayed by the first light emitting element 3 is L1, but due to the aging factor, the actual luminance value L2 displayed by the first light emitting element 3 under the effect of the analog data voltage V5 is smaller than L1. At this time, according to
And calculating the actual brightness attenuation percentage, and acquiring a compensation regulation and control parameter. Under the regulation and control of the compensation regulation and control parameter, the digital-to-analog conversion module 19 converts the analog data voltage corresponding to the 255 gray scale into V6, where V6 is less than V5, so that, in theory, the light-emitting luminance value L3 of the first light-emitting element 3 under the analog data voltage V6 is greater than L1, but affected by the aging factor, the actual luminance value L4 displayed by the first light-emitting element 3 under the effect of the analog data voltage V5 is less than L3 and approaches L1, and therefore, by means of the compensation mode, the actual luminance value compensated by the first light-emitting element 3 can be ensured to approach the target luminance value.
An embodiment of the present invention further provides a brightness compensation method for a display panel, where the brightness compensation method is applied to the display panel, and as shown in fig. 8 with reference to fig. 1 to 3, fig. 8 is a flowchart of the brightness compensation method provided in the embodiment of the present invention, and the brightness compensation method includes:
step S1: the second light emitting element 5 is controlled to emit light in the same light emission state as the first light emitting element 3.
The light emitting state of the second light emitting element 5 is the same as that of the first light emitting element 3, so that the aging degree of the second light emitting element 5 is consistent with that of the first light emitting element 3, and further the brightness attenuation degree of the second light emitting element 5 is consistent with that of the first light emitting element 3.
Step S2: in the first stage, the initialization submodule 7 of the light sensing unit 4 provides a first reference signal to the first node N1 and a high signal to the second node N2.
At this stage, the initialization submodule 7 writes the first reference signal provided from the first reference signal terminal Vref1 into the first node N1, and writes the high level signal provided from the high level signal into the second node N2, thereby realizing the potential initialization of the first node N1 and the second node N2.
Step S3: in the second phase, the light sensing element 8 senses the optical signal of the second light emitting element 5 and transmits the photocurrent signal converted from the optical signal to the first node N1.
At this stage, the light sensing element 8 senses the optical signal of the second light emitting element 5 and converts the sensed optical signal into a photo current signal, which flows to the first node N1, raising the potential of the first node N1. The magnitude of the photocurrent signal is related to the light-emitting luminance of the second light-emitting element 5, and the higher the light-emitting luminance of the second light-emitting element 5 is, the larger the photocurrent signal is, and the larger the increase degree of the potential of the first node N1 is.
Step S4: in the third stage, the feedback submodule 9 feeds back the voltage signal of the first node N1 to the third node N3, and the output submodule 10 transmits the voltage signal of the third node N3 to the output signal line OL.
At this stage, the feedback sub-module 9 controls the voltage signal of the third node N3 to increase with the increase of the voltage signal of the first node N1, and then the magnitude of the voltage signal of the first node N1 is fed back according to the magnitude of the voltage signal of the third node N3.
Step S5: in the fourth stage, the compensation unit 11 obtains a compensation signal according to the voltage signal output by the output sub-module 10, and compensates the light emitting brightness of the first light emitting element 3 according to the compensation signal.
At this stage, the compensation unit 11 obtains the luminance of the second light emitting element 5 according to the magnitude of the voltage signal of the third node N3, and further obtains the luminance attenuation degrees of the second light emitting element 5 and the first light emitting element 3, and further obtains the compensation signal according to the luminance attenuation degree to compensate the first light emitting element 3, so that the actual luminance of the first light emitting element 3 is equal to the target luminance.
By adopting the brightness compensation method provided by the embodiment of the invention, the light-emitting state of the second light-emitting element 5 is the same as that of the first light-emitting element 3, so that the aging degree of the second light-emitting element 5 can be ensured to be consistent with that of the first light-emitting element 3, and further, the brightness attenuation degree of the first light-emitting element 3 can be accurately fed back by detecting the brightness of the second light-emitting element 5. Moreover, the magnitude of the voltage signal of the first node N1 can accurately feedback the brightness of the second light emitting device 5, and the magnitude of the voltage signal of the first node N1 can also be accurately fed back by the voltage signal of the third node N3, so that after the compensation unit 11 obtains the voltage signal of the third node N3, the brightness attenuation degree of the second light emitting device 5 (the first light emitting device 3) can be accurately determined, and the first light emitting device 3 can be accurately compensated, so that the brightness attenuation caused by aging of the first light emitting device 3 is improved, the target brightness value is displayed, and the display performance of the display panel is improved.
Optionally, with reference to fig. 3, the initialization submodule 7 includes: a first transistor T1, a gate of the first transistor T1 being electrically connected to the first control signal terminal Vck1, a first pole of the first transistor T1 being electrically connected to the first reference signal terminal Vref1, and a second pole of the first transistor T1 being electrically connected to the first node N1; a gate of the second transistor T2, a gate of the second transistor T2 is electrically connected to the first control signal terminal Vck1, a first pole of the second transistor T2 is electrically connected to the high level signal terminal VGH, and a second pole of the second transistor T2 is electrically connected to the second node N2. The feedback sub-module 9 includes: a third transistor T3, a gate of the third transistor T3 being electrically connected to the second control signal terminal Vck2, a first pole of the third transistor T3 being electrically connected to the second reference signal terminal Vref2, and a second pole of the third transistor T3 being electrically connected to the second node N2; a fourth transistor T4, a gate of the fourth transistor T4 being electrically connected to the second node N2, a first pole of the fourth transistor T4 being electrically connected to the first fixed signal terminal VDD, a second pole of the fourth transistor T4 being electrically connected to the third node N3; a gate of the fifth transistor T5, a gate of the fifth transistor T5 are electrically connected to the first node N1, a first pole of the fifth transistor T5 are electrically connected to the third node N3, and a second pole of the fifth transistor T5 are electrically connected to the second fixed signal terminal VEE. The output sub-module 10 includes: a gate of the sixth transistor T6, the sixth transistor T6 is electrically connected to the second control signal terminal Vck2, a first pole of the sixth transistor T6 is electrically connected to the third node N3, and a second pole of the sixth transistor T6 is electrically connected to the output signal line OL.
With reference to fig. 6, step S2 may specifically include: in the first phase T1, the first transistor T1 and the second transistor T2 are turned on by the first control signal, the first reference signal is transmitted to the first node N1 through the turned-on first transistor T1, and the high level signal is transmitted to the second node N2 through the turned-on second transistor T2.
Step S3 may specifically include: in the second stage t2, the light sensing element 8 senses the optical signal of the second light emitting element 5 and transmits the photocurrent signal converted from the optical signal to the first node N1.
Step S4 may specifically include: in the third stage T3, the third transistor T3 is turned on by the second control signal, the second reference signal is transmitted to the second node N2 through the turned-on third transistor T3, the fourth transistor T4 is in a saturation region by the second reference signal, and the saturation leakage current I of the fourth transistor T4 is transmitted to the fifth transistor T5, where I ═ (1/2) μnCox(W4/L4)(Vref2-VDD-Vth)2，μnFor electron mobility, CoxIs a unit area gate oxide capacitance, W4/L4Is the width-to-length ratio, V, of the fourth transistor T4ref2Is a second reference signal, VDDIs a first fixed signal, VthIs the threshold voltage; under the action of the photocurrent signal, the voltage signal at the first node N1 gradually increases according to the I ═ 1/2 μnCox(W5/L5)(VN3-VN1-Vth)2，W5/L5The voltage signal V of the third node N3 is used for the width-to-length ratio of the fifth transistor T5N3Feeds back the voltage signal V of the first node N1N1. At the action of the second control signalWith the sixth transistor T6 turned on, the voltage signal V of the third node N3N3To the output signal line OL via the turned-on sixth transistor T6.
In the third stage T3, the fourth transistor T4 may be regarded as a constant current source, the fourth transistor T4 may provide a stable constant current I to the fifth transistor T5, and the fifth transistor T5 may be regarded as a source follower under the action of the voltage signal of the first node N1, and the source voltage (the voltage signal of the third node N3) thereof increases with the increase of the gate voltage (the voltage signal of the first node N1), so that the magnitude of the voltage signal of the first node N1 can be accurately fed back according to the magnitude of the voltage signal of the third node N3.
Optionally, with reference to fig. 7, the compensation unit 11 includes: the attenuation degree obtaining module 17, wherein the attenuation degree obtaining module 17 is electrically connected with the output sub-module 10; the regulating parameter acquiring module 18 is electrically connected with the attenuation degree acquiring module 17 and the regulating parameter acquiring module 18; the digital-to-analog conversion module 19 and the digital-to-analog conversion module 19 are respectively electrically connected with the control parameter obtaining module 18, the driving chip and the first light emitting element 3. As shown in fig. 9, fig. 9 is another flowchart of the brightness compensation method according to the embodiment of the present invention, and step S5 may specifically include:
step S51: the attenuation degree obtaining module 17 obtains the actual brightness attenuation percentage according to the voltage signal output by the output sub-module 10.
Specifically, after the attenuation degree obtaining module 17 obtains the voltage signal of the third node N3, the actual luminance of the second light emitting element 5 and the actual luminance of the first light emitting element 3 can be obtained according to the magnitude of the voltage signal of the third node N3, so as to obtain the actual luminance attenuation percentage of the first light emitting element 3.
Step S52: the control parameter obtaining module 18 obtains the compensation control parameter corresponding to the actual brightness attenuation percentage according to the stored brightness attenuation percentage-control parameter mapping relationship.
Specifically, the control parameter obtaining module 18 searches a pre-stored luminance attenuation percentage-control parameter mapping relationship according to the actual luminance attenuation percentage to obtain a control parameter corresponding to the actual luminance attenuation percentage, where the control parameter is a compensation control parameter.
Step S53: the digital-to-analog conversion module 19 converts the digital data signal provided by the driving chip into a compensation analog data signal according to the compensation regulation parameter, and transmits the compensation analog data signal to the first light emitting element 3 to compensate the light emitting brightness of the first light emitting element 3.
Specifically, the digital-to-analog conversion module 19 converts the digital data signal provided by the driving chip into the compensation analog data signal based on the compensation regulation and control parameter, so as to ensure that the actual luminance of the compensated first light-emitting element 3 is equal to the target luminance, thereby improving the display effect.
Optionally, step S51 may specifically include: acquiring an actual brightness value L1 corresponding to the voltage signal output by the output sub-module 10 according to the stored voltage-brightness value mapping relation; the actual brightness decay percentage is calculated according to | L2-L1|/L2, wherein L2 is the standard brightness value corresponding to the second light emitting element 5.
Specifically, the attenuation degree obtaining module 17 stores a voltage-luminance value mapping relationship in advance, where the mapping relationship may be a mapping relationship between the voltage signal of the third node N3 and the luminance value of the second light-emitting element 5, or a mapping relationship between the voltage signal of the first node N1 and the luminance value of the second light-emitting element 5, and obtains an actual luminance value of the second light-emitting element 5 (the first light-emitting element 3) by searching in the mapping relationship, and further calculates an actual luminance attenuation percentage of the second light-emitting element 5 (the first light-emitting element 3) according to a standard luminance value corresponding to the second light-emitting element 5 (the first light-emitting element 3).
As shown in fig. 10, fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present invention, and the display device includes the display panel 100. The specific structure of the display panel 100 has been described in detail in the above embodiments, and is not described herein again. Of course, the display device shown in fig. 10 is only a schematic illustration, and the display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, or a television.
Since the display device provided by the embodiment of the present invention includes the display panel 100, by using the display device, the luminance of the first light emitting element 3 can be accurately detected, the luminance attenuation degree of the first light emitting element 3 is obtained, and then the first light emitting element 3 is accurately compensated, so that the luminance attenuation caused by the aging of the light emitting element is improved, the target luminance value is displayed, and the display performance of the display device is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (18)
1. A display panel, comprising:
the display device comprises a display area and a non-display area surrounding the display area, wherein a first light-emitting element is arranged in the display area;
the light sensing detection unit comprises a second light emitting element and a detection module; the second light-emitting element is positioned in the non-display area, and the light-emitting state of the second light-emitting element is the same as that of the first light-emitting element;
the detection module comprises an initialization submodule, a photosensitive element, a feedback submodule and an output submodule;
the initialization submodule is respectively electrically connected with a first control signal end, a first reference signal end, a high-level signal end, a first node and a second node and is used for providing a first reference signal for the first node and providing a high-level signal for the second node;
the photosensitive element is respectively electrically connected with the first fixed signal end and the first node, and is used for sensing the optical signal of the second light-emitting element and transmitting the photocurrent signal converted by the optical signal to the first node;
the feedback submodule is respectively electrically connected with a second control signal terminal, a second reference signal terminal, the first fixed signal terminal, a second fixed signal terminal, the first node, the second node and a third node and is used for feeding back a voltage signal of the first node to the third node;
the output submodule is electrically connected with the second control signal terminal, the third node and the output signal line respectively and is used for transmitting the voltage signal of the third node to the output signal line;
and the compensation unit is respectively electrically connected with the output submodule and the first light-emitting element and is used for acquiring a compensation signal according to the voltage signal output by the output submodule and compensating the light-emitting brightness of the first light-emitting element according to the compensation signal.
2. The display panel according to claim 1, wherein the display area comprises n sub-display areas, the display panel comprises n light-sensing units, and n is a positive integer greater than 1;
the second light emitting element in one of the light sensing units and the first light emitting element in one of the sub-display regions emit light in the same state.
3. The display panel according to claim 1, wherein each of the light sensing units comprises a plurality of colors of the second light emitting elements, and the second light emitting element in one of the light sensing units has the same light emitting state as the first light emitting element of the same color.
4. The display panel according to claim 1, wherein the second light-emitting element comprises a cathode layer, a light-emitting layer, and a transparent anode layer.
5. The display panel according to claim 4,
the photosensitive element is positioned on one side of the second light-emitting element back to the light-emitting surface of the display panel.
6. The display panel according to claim 1, characterized in that the display panel further comprises:
and the light shielding layer is positioned on one side of the second light-emitting element facing the light-emitting surface of the display panel.
7. The display panel of claim 1, wherein the initialization submodule comprises:
a first transistor, a gate of which is electrically connected to the first control signal terminal, a first electrode of which is electrically connected to the first reference signal terminal, and a second electrode of which is electrically connected to the first node;
and a gate of the second transistor is electrically connected to the first control signal terminal, a first electrode of the second transistor is electrically connected to the high-level signal terminal, and a second electrode of the second transistor is electrically connected to the second node.
8. The display panel of claim 1, wherein the feedback sub-module comprises:
a third transistor, a gate of which is electrically connected to the second control signal terminal, a first electrode of which is electrically connected to the second reference signal terminal, and a second electrode of which is electrically connected to the second node;
a gate of the fourth transistor is electrically connected to the second node, a first electrode of the fourth transistor is electrically connected to the first fixed signal terminal, and a second electrode of the fourth transistor is electrically connected to the third node;
a gate of the fifth transistor is electrically connected to the first node, a first electrode of the fifth transistor is electrically connected to the third node, and a second electrode of the fifth transistor is electrically connected to the second fixed signal terminal.
9. The display panel of claim 1, wherein the output sub-module comprises:
a gate of the sixth transistor is electrically connected to the second control signal terminal, a first electrode of the sixth transistor is electrically connected to the third node, and a second electrode of the sixth transistor is electrically connected to the output signal line.
10. The display panel of claim 1, wherein the detection module further comprises:
a first electrode of the first capacitor is electrically connected with the first fixed signal end, and a second electrode of the first capacitor is electrically connected with the first node;
and a first electrode of the second capacitor is electrically connected with the first fixed signal end, and a second electrode of the second capacitor is electrically connected with the second node.
11. The display panel according to claim 1,
the photosensitive element comprises a silicon-based PIN device, an indium gallium zinc oxide thin film transistor, a low-temperature polycrystalline silicon thin film transistor or an amorphous silicon device.
12. The display panel according to claim 1,
the display area is also provided with a data line which is electrically connected with the first light-emitting element;
the output signal line and the data line are arranged on the same layer.
13. The display panel according to claim 1, wherein the compensation unit comprises:
the attenuation degree acquisition module is electrically connected with the output submodule and used for acquiring the actual brightness attenuation percentage according to the voltage signal output by the output submodule;
the control parameter acquisition module is electrically connected with the attenuation degree acquisition module and is used for acquiring compensation control parameters corresponding to the actual brightness attenuation percentage according to a stored brightness attenuation percentage-control parameter mapping relation;
and the digital-to-analog conversion module is respectively electrically connected with the regulation and control parameter acquisition module, the driving chip and the first light-emitting element, and is used for converting the digital data signal provided by the driving chip into a compensation analog data signal according to the compensation regulation and control parameter, transmitting the compensation analog data signal to the first light-emitting element and compensating the light-emitting brightness of the first light-emitting element.
14. A method for compensating luminance of a display panel, applied to the display panel according to claim 1, comprising:
controlling the second light-emitting element to emit light in the same light-emitting state as the first light-emitting element;
in the first stage, the initialization submodule of the light sensing detection unit provides the first reference signal for the first node and provides the high level signal for the second node;
a second stage, in which the light sensing element senses an optical signal of the second light emitting element and transmits a photocurrent signal converted by the optical signal to the first node;
in a third stage, the feedback submodule feeds the voltage signal of the first node back to the third node, and the output submodule transmits the voltage signal of the third node to the output signal line;
and in the fourth stage, the compensation unit acquires a compensation signal according to the voltage signal output by the output submodule, and compensates the light-emitting brightness of the first light-emitting element according to the compensation signal.
15. The luminance compensation method as recited in claim 14,
the initialization submodule includes:
a first transistor, a gate of which is electrically connected to the first control signal terminal, a first electrode of which is electrically connected to the first reference signal terminal, and a second electrode of which is electrically connected to the first node; a gate of the second transistor is electrically connected to the first control signal terminal, a first electrode of the second transistor is electrically connected to the high-level signal terminal, and a second electrode of the second transistor is electrically connected to the second node;
the feedback sub-module includes:
a third transistor, a gate of which is electrically connected to the second control signal terminal, a first electrode of which is electrically connected to the second reference signal terminal, and a second electrode of which is electrically connected to the second node; a gate of the fourth transistor is electrically connected to the second node, a first electrode of the fourth transistor is electrically connected to the first fixed signal terminal, and a second electrode of the fourth transistor is electrically connected to the third node; a gate of the fifth transistor is electrically connected to the first node, a first electrode of the fifth transistor is electrically connected to the third node, and a second electrode of the fifth transistor is electrically connected to the second fixed signal terminal;
the output sub-module includes:
a gate of the sixth transistor is electrically connected to the second control signal terminal, a first electrode of the sixth transistor is electrically connected to the third node, and a second electrode of the sixth transistor is electrically connected to the output signal line;
in the first stage, the initialization submodule of the light sensing detection unit provides the first reference signal to the first node and provides the high level signal to the second node; a second stage, in which the light sensing element senses an optical signal of the second light emitting element and transmits a photocurrent signal converted by the optical signal to the first node; in a third phase, the feedback sub-module feeds back the voltage signal of the first node to the third node, and the output sub-module transmits the voltage signal of the third node to the output signal line, including:
a first stage in which the first transistor and the second transistor are turned on under the action of a first control signal, the first reference signal is transmitted to the first node through the turned-on first transistor, and the high-level signal is transmitted to the second node through the turned-on second transistor;
a second stage, in which the light sensing element senses an optical signal of the second light emitting element and transmits a photocurrent signal converted by the optical signal to the first node;
a third stage in which the third transistor is turned on by a second control signal, a second reference signal is transmitted to the second node via the turned-on third transistor, the fourth transistor is in a saturation region by the second reference signal and a fixed potential signal, and a saturation leakage current I of the fourth transistor is transmitted to the fifth transistor, where I ═ (1/2) μnCox(W4/L4)(Vref2-VDD-Vth)2，μnFor electron mobility, CoxIs a unit area gate oxide capacitance, W4/L4Is the width-to-length ratio, V, of the fourth transistorref2For the second reference signal, VDDIs a first fixed signal, VthIs the threshold voltage; under the action of the photocurrent signal, the voltage signal of the first node gradually rises according to the I ═ 1/2 [ mu ]nCox(W5/L5)(VN3-VN1-Vth)2，W5/L5Using said third node for the aspect ratio of said fifth transistorVoltage signal VN3Feeding back a voltage signal V of the first nodeN1(ii) a Under the action of the second control signal, the sixth transistor is conducted, and the voltage signal V of the third nodeN3The voltage is transmitted to the output signal line via the turned-on sixth transistor.
16. The luminance compensation method as recited in claim 14,
the compensation unit includes:
the attenuation degree acquisition module is electrically connected with the output submodule;
the regulating parameter acquisition module is electrically connected with the attenuation degree acquisition module;
the digital-to-analog conversion module is electrically connected with the regulation parameter acquisition module, the driving chip and the first light-emitting element respectively;
the compensation unit acquires a compensation signal according to the voltage signal output by the output submodule, and the compensation of the light-emitting brightness of the first light-emitting element according to the compensation signal comprises the following steps:
the attenuation degree obtaining module obtains actual brightness attenuation percentage according to the voltage signal output by the output submodule;
the control parameter acquisition module acquires a compensation control parameter corresponding to the actual brightness attenuation percentage according to a stored brightness attenuation percentage-control parameter mapping relation;
and the digital-to-analog conversion module converts the digital data signal provided by the driving chip into a compensation analog data signal according to the compensation regulation and control parameter, transmits the compensation analog data signal to the first light-emitting element and compensates the light-emitting brightness of the first light-emitting element.
17. The method of claim 16, wherein the obtaining the actual brightness reduction percentage according to the voltage signal output by the output sub-module comprises:
acquiring an actual brightness value L1 corresponding to the voltage signal output by the output submodule according to the stored voltage-brightness value mapping relation;
and calculating the actual brightness attenuation percentage according to the | L2-L1|/L2, wherein L2 is the standard brightness value corresponding to the second light-emitting element.
18. A display device comprising the display panel according to any one of claims 1 to 13.
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