CN112117320B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN112117320B CN112117320B CN202011069448.0A CN202011069448A CN112117320B CN 112117320 B CN112117320 B CN 112117320B CN 202011069448 A CN202011069448 A CN 202011069448A CN 112117320 B CN112117320 B CN 112117320B
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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
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/123—Connection of the pixel electrodes to the thin film transistors [TFT]
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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]
- G09G3/3225—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] using an active matrix
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
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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
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/131—Interconnections, e.g. wiring lines or terminals
Abstract
The invention discloses a display panel and a display device, comprising: a display area; the display area comprises a high-light-transmission area, a first display area surrounding the high-light-transmission area and a second display area positioned between the first display area and the high-light-transmission area; further comprising: a substrate base plate; a plurality of pixel driving circuits on one side of the substrate base plate; at least part of the first pixel driving circuit is positioned in the second display area; each first light-emitting element positioned on one side of the pixel driving circuit, which is far away from the substrate base plate, is electrically connected with each first pixel driving circuit in a one-to-one correspondence manner through each anode signal wire; the anode signal line transmits the driving current generated by the first pixel driving circuit to the first light emitting element; a coupling layer which is arranged between the anode signal line and the pixel drive circuit and is insulated with the anode signal line and the pixel drive circuit; the capacitance of the coupling capacitor formed by the first node of each pixel driving circuit and the coupling structure and/or the anode signal line is within the preset capacitance range, so that the uniformity of a display picture is ensured.
Description
Technical Field
The invention relates to the technical field of display panels, in particular to a display panel and a display device.
Background
With the development of display technology, the display device gradually progresses from a narrow frame to a frameless visual effect to improve the screen occupation ratio of the display device, and the optical sensor module of the display device with the high screen occupation ratio, such as a camera and an infrared sensor, is arranged in the display area of the display device. At present, in order to make the area where the optical sensor module is disposed have higher light transmittance, the pixel density of the area where the optical sensor module is disposed is generally reduced.
When the display panel of the display device is an Organic Light-Emitting Diode (OLED) display panel, the OLED elements of the OLED display panel belong to a current-driven type element, and a corresponding pixel driving circuit needs to be provided to provide a driving current for the OLED elements, so that the OLED elements can emit Light. When the display area of the OLED display panel includes the optical sensor arrangement area, in the prior art, the pixel driving circuit of the OLED element in the optical sensor arrangement area is arranged in another display area, for example, a transition area between the normal display area and the optical sensor arrangement area, and the anode of the OLED element in the optical sensor arrangement area is electrically connected to the pixel driving circuit arranged in the transition area by using the corresponding anode signal line, so that the pixel driving circuit in the transition area can drive the OLED element in the optical sensor arrangement area to emit light.
However, due to the fact that the lengths of the anode signal lines electrically connected to the different pixel circuits in the transition region are different, coupling capacitances formed by the pixel circuits in the transition region and the anode signal lines are different, and therefore the influence of the anode signal transmitted by the anode signal lines on the first node electrically connected to the gate of the driving transistor in each pixel circuit is different, and therefore the display panel has the problems of split display and the like, and the display effect of the OLED display panel is further affected.
Disclosure of Invention
Embodiments of the present invention provide a display panel and a display device, so as to ensure display uniformity of each light emitting element in the display panel and improve a display effect of the display panel.
In a first aspect, an embodiment of the present invention provides a display panel, including: a display area; the display area comprises a high-light-transmission area, a first display area surrounding the high-light-transmission area and a second display area positioned between the first display area and the high-light-transmission area;
the display panel further includes:
a substrate base plate;
a plurality of pixel driving circuits located at one side of the substrate base plate; each of the pixel driving circuits includes a driving transistor and a first node electrically connected to a gate of the driving transistor; the pixel driving circuit includes a first pixel driving circuit; at least part of the first pixel driving circuit is positioned in the second display area;
the plurality of light-emitting elements are positioned on one side, away from the substrate, of the pixel driving circuit and are arranged in one-to-one correspondence with the pixel driving circuits; the light emitting elements are positioned in the first display area, the second display area and the high light-transmitting area, and the light emitting elements positioned in the high light-transmitting area are first light emitting elements;
the conducting layer is positioned on one side, away from the substrate, of the pixel driving circuit; the conductive layer includes a plurality of anode signal lines; each first light-emitting element is electrically connected with each first pixel driving circuit in a one-to-one correspondence manner through each anode signal line; the anode signal line is used for transmitting a driving current generated by a driving transistor of the first pixel driving circuit to the first light-emitting element;
a coupling layer located between the conductive layer and the pixel driving circuit and insulated from the anode signal line and the pixel driving circuit; the coupling layer comprises at least one coupling structure;
and the capacitance of a coupling capacitor formed by the first node of each pixel driving circuit positioned in the second display area and the coupling structure and/or the anode signal line is within a preset capacitance range.
In a second aspect, an embodiment of the present invention further provides a display device, including the display panel according to the first aspect.
In the display panel and the display device provided by the embodiment of the invention, the first pixel driving circuit corresponding to at least part of the first light-emitting elements in the high-light-transmission area is arranged in the second display area, and the first light-emitting elements in the high-light-transmission area and the first pixels in the second display area are respectively and electrically connected through the anode signal line of the conductive layer, so that the high-light-transmission area has a larger light-transmission area; meanwhile, a coupling layer is arranged between the conducting layer and the pixel driving circuits, and the capacitance of the coupling capacitor formed by the first node of each pixel driving circuit positioned in the second display area and the coupling structure of the coupling layer and/or the anode signal line of the conducting layer is limited within the preset capacitance range, so that the potential of the coupling structure and/or the anode signal line is coupled to the potential of the first node of each pixel circuit positioned in the second display area to keep consistent, the problem of split display caused by different potential fluctuations of the first node of each pixel circuit positioned in the second display area due to different potentials of the coupling structure and/or the anode signal line to the first node of each pixel circuit positioned in the second display area is solved, the display uniformity of the display panel can be improved, and the display effect of the display panel is improved.
Drawings
Fig. 1 is a schematic partial enlarged structure view of a display panel according to the related art;
fig. 2 is a schematic top view of a display panel according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a film structure of a display panel according to an embodiment of the present invention;
fig. 4 is an equivalent circuit diagram of a pixel driving circuit and a light emitting element in a display panel according to an embodiment of the invention;
FIG. 5 is a schematic top view of another display panel according to an embodiment of the present invention;
FIG. 6 is a top view of a film layer of a pixel driving circuit according to an embodiment of the present invention;
fig. 7 is an equivalent circuit diagram of a pixel driving circuit corresponding to fig. 6;
FIG. 8 is a schematic view of a film layer structure taken along section A-A of FIG. 6;
fig. 9 is a schematic view of a partial structure of a display panel according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a partial film structure of a display panel according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of a partial structure of another display panel according to an embodiment of the present invention;
FIG. 12 is a schematic diagram of a partial structure of another display panel according to an embodiment of the present invention;
FIG. 13 is a schematic diagram of a partial structure of another display panel according to an embodiment of the present invention;
FIG. 14 is a schematic view of a film layer structure of section B-B of FIG. 13;
FIG. 15 is a schematic diagram of a partial structure of another display panel according to an embodiment of the present invention;
fig. 16 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic diagram of a partially enlarged structure of a display panel in the related art. As shown in fig. 1, in order to enable the high light transmission region 0102 provided with the camera to realize display and have a larger light transmission area, a part of the pixel driving circuit 021 for driving the light emitting element 011 in the high light transmission region 0102 may be provided in the transition display region 0103; at this time, the light emitting element in the high light transmission region 0102 can be electrically connected to the pixel driving circuit 021 disposed in the transition display region 0103 through the anode signal line 031.
However, since the space for disposing the anode signal line 031 in the transition display region 0103 is limited, the anode signal line 031 overlaps the pixel driving circuit 021 in the transition display region 0103 to form a coupling capacitor, and more pixel driving circuits 021 overlap the anode signal line 0311 electrically connected to the pixel driving circuit 0211 farther from the high-transmittance region 0102, the anode signal line 0311 forms a coupling capacitor with the pixel driving circuit 0211 and other pixel driving circuits 021 between the pixel driving circuit 0211 and the high-transmittance region 0102, and less pixel driving circuits 021 overlap the anode signal line 0312 electrically connected to the pixel driving circuit 0212 closer to the high-transmittance region 0102, and the anode signal line 0312 forms a coupling capacitor with the pixel driving circuit 0212 and other pixel driving circuits between the pixel driving circuit 0212 and the high-transmittance region 0102; thus, the number of the anode signal lines 031 overlapped with the pixel driving circuits 0212 closer to the high light-transmitting region 0102 is larger, and the number of the anode signal lines 031 overlapped with the pixel driving circuits 0211 farther from the high light-transmitting region 0102 is smaller, so that the coupling capacitance formed by the pixel driving circuits 0212 and the anode signal lines 031 is larger, the influence of the anode signal transmitted by each anode signal line 031 on the pixel driving circuits 0212 is larger, the coupling capacitance formed by the pixel driving circuits 0211 and the anode signal lines 031 is smaller, the influence of the anode signal transmitted by each anode signal line 031 on the pixel driving circuits 0211 is smaller, that is, the influence of the anode signal transmitted by the anode signal line 031 on each pixel driving circuit 021 in the transition display region 0103 is different, so that the driving capability of each pixel driving circuit 021 in the transition display region on each light-emitting element is different, the display uniformity of the display panel is affected, thereby reducing the display effect of the display panel.
To solve the above technical problem, an embodiment of the present invention provides a display panel, including: a display area; the display area comprises a high-light-transmission area, a first display area surrounding the high-light-transmission area and a second display area located between the first display area and the high-light-transmission area. The display panel further includes: the display device comprises a substrate and a plurality of pixel driving circuits arranged on one side of the substrate, wherein each pixel driving circuit comprises a driving transistor and a first node electrically connected with a grid electrode of the driving transistor, each pixel driving circuit comprises a first pixel driving circuit, and at least part of the first pixel driving circuits are arranged in a second display area. The light-emitting elements are positioned on one side, away from the substrate, of the pixel driving circuit and are in one-to-one correspondence with the pixel driving circuits, the light-emitting elements are positioned in the first display area, the second display area and the high light-transmitting area, the light-emitting elements positioned in the high light-transmitting area are first light-emitting elements, and the conducting layer is positioned on one side, away from the substrate, of the pixel driving circuit; the conductive layer includes a plurality of anode signal lines; each first light-emitting element is electrically connected with each first pixel driving circuit in a one-to-one correspondence manner through each anode signal line, and the anode signal lines are used for transmitting the driving current generated by the driving transistors of the first pixel driving circuits to the first light-emitting elements. The coupling layer is positioned between the anode signal line and the pixel driving circuit and is mutually insulated from the anode signal line and the pixel driving circuit, and the coupling layer comprises at least one coupling structure; the capacitance of the coupling capacitor formed by the first node of each pixel driving circuit in the second display area and the coupling structure and/or the anode signal line is within the preset capacitance range.
By adopting the technical scheme, on one hand, at least part of the first light-emitting elements in the high light-transmitting area are arranged in the second display area corresponding to the first pixel driving circuits, and the first light-emitting elements in the high light-transmitting area are required to be electrically connected with the first pixel driving circuits in the second display area through the anode signal lines of the conducting layer, so that the driving current generated by the driving transistors of the first pixel driving circuits according to the grid potentials of the driving transistors can be transmitted to the corresponding first light-emitting elements through the corresponding anode signal lines to drive the first light-emitting elements to emit light, the position in the high light-transmitting area for arranging the first pixel driving circuits can transmit light, and the light-transmitting area of the high light-transmitting area is increased; on the other hand, the coupling layer is arranged between the pixel driving circuits and the conductive layer, so that the capacitance of the coupling capacitor formed by the coupling structure of each pixel driving circuit and the coupling layer and/or the anode signal line in the second display area is within the preset capacitance range, the influence of the coupling structure and/or the anode signal line on each pixel driving circuit in the second display area is kept consistent, the display uniformity of the display panel can be improved, and the display effect of the display panel is improved.
The above is the core idea of the present invention, and based on the embodiments of the present invention, a person skilled in the art can obtain all other embodiments without creative efforts, which belong to the protection scope of the present invention. The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
In the display panel provided in the embodiment of the present invention, at least a portion of the first pixel driving circuits for driving the first light emitting elements in the high light transmission region are disposed in the second display region, that is, all the first pixel driving circuits corresponding to the first light emitting elements in the high light transmission region are disposed in the second display region; or the first pixel driving circuit corresponding to part of the first light-emitting elements in the high-light-transmission area is positioned in the high-light-transmission area, and the first pixel driving circuit corresponding to the other part of the first light-emitting elements is arranged in the second display area. For convenience of description, in the embodiments of the present invention, the first pixel driving circuits corresponding to all the first light emitting elements in the high light transmission region are disposed in the second display region, and the technical solutions of the embodiments of the present invention are exemplarily described.
Fig. 2 is a schematic top view of a display panel according to an embodiment of the present invention, and fig. 3 is a schematic film structure of the display panel according to the embodiment of the present invention. As shown in fig. 2 and the drawings, the display area 110 of the display panel 100 includes a high-transmittance area 111, a first display area 112 and a second display area 113, the first display area 112 surrounds the high-transmittance area 111, and the second display area 113 is located between the first display area 112 and the high-transmittance area 111. The high light transmission region 111 has a large light transmission area and a high light transmittance, and can be used for disposing a photosensitive device, such as a camera, an infrared sensor, and the like. At this time, the corresponding photosensitive device can be set without increasing the frame size of the display panel 100, thereby being beneficial to narrowing the frame of the display panel and improving the screen occupation ratio of the display panel.
The display panel 100 further includes a substrate base plate 10; a plurality of pixel driving circuits 20 disposed on one side of the base substrate 10; and a plurality of light emitting elements 30 located on a side of the pixel driving circuit 20 away from the substrate 10 and disposed in one-to-one correspondence with the pixel driving circuits 20, that is, each pixel driving circuit 20 is electrically connected to each light emitting element 30 in one-to-one correspondence, and the first display area 112, the second display area 113 and the high light-transmitting area 111 are all provided with the light emitting elements 30, so that the first display area 112, the second display area 113 and the high light-transmitting area 111 can emit light for display, and the display panel 100 really realizes full screen display.
In general, the pixel driving circuit 30 includes a plurality of metal layers and insulating layers disposed between the metal layers, and a portion of the metal layers and a portion of the insulating layers have a light shielding function, and if a large number of pixel driving circuits 20 are disposed in the high-transmittance region 111, the overall light transmittance of the high-transmittance region 111 is affected. When the light emitting device in the high-transmittance region 111 is the first light emitting device 31 and the pixel driving circuit for driving the first light emitting device 31 to emit light is the first pixel driving circuit 21, the first pixel driving circuit 21 may be disposed in the second display region 113 to increase the light transmittance area of the high-transmittance region 111, so that more light can be transmitted through the high-transmittance region 111 and received by the light sensing device disposed in the high-transmittance region 111.
In addition, the light emitting element located in the first display region 112 may be the second light emitting element 32, and the light emitting element located in the second display region 113 may be the third light emitting element 33; the pixel driving circuit electrically connected to the second light emitting element 32 is the second pixel driving circuit 22, and the second pixel driving circuit 22 may be located in the first display region 112; the pixel driving circuit electrically connected to the third light emitting element 33 is the third pixel driving circuit 23, and the third pixel driving circuit 23 may be located in the second display region 113.
When the first pixel driving circuit 21 corresponding to the first light emitting element 31 in the high light transmittance region 111 is disposed in the second display region 113, a conductive layer 40 may be disposed between the pixel driving circuit 20 and the light emitting element 30, such that the first light emitting element 31 in the high light transmittance region 111 is electrically connected to the first pixel driving circuit 21 in the second display region 113 through the anode signal line 41 in the conductive layer 40, and the anode signal line 41 crosses the high light transmittance region 111 and the second display region 112. When the distances between the first pixel driving circuits 21 in the second display region 113 and the high light transmission region 111 are different, the extension lengths of the anode signal lines 41 in the second display region 111 are different, so that the number of the anode signal lines 41 overlapped by the pixel driving circuits in the second display region 113 is different.
In addition, fig. 4 is an equivalent circuit diagram of a pixel driving circuit and a light emitting element in a display panel according to an embodiment of the present invention. As shown in fig. 4, each pixel driving circuit 20 may include a driving transistor T and a first node N1 electrically connected to a gate electrode of the driving transistor T, the first node N1 may be, for example, a connection line electrically connected to the gate electrode of the driving transistor T, and the driving transistor T may be electrically connected to other active or passive devices of the pixel driving circuit 20 through a first node N1; the driving transistor T of each pixel driving circuit 20 can provide a driving current to each light emitting element 30 in a one-to-one correspondence manner according to the gate potential thereof, so as to drive each light emitting element 30 to emit light; therefore, when the potential at the first node N1 in the pixel driving circuit 20 changes, the gate potential of the driving transistor T electrically connected to the first node N1 in the pixel driving circuit 20 is affected, and the display light emission luminance of each light emitting element 30 is affected. And when the number of the anode signal lines overlapping with the respective pixel driving circuits located in the second display region is different, the influence of the respective anode signal lines on the potential of the first node N1 of the respective pixel driving circuits has a difference; the difference is mainly expressed in that the coupling capacitance formed by the first node N1 and the anode signal line in the pixel driving circuit with a large number of overlapped anode signal lines is large, and the influence of the signal transmitted on each anode signal line on the first node N1 and the anode signal line in the pixel driving circuit is large; and the coupling capacitance formed by the first node N1 and the anode signal line in the pixel driving circuit with the smaller number of overlapped anode signal lines is smaller, and the influence of the signal transmitted on each anode signal line on the first node N1 and the anode signal line in the pixel driving circuit is small, so that the influence of the anode signal line on the light-emitting brightness of each light-emitting element is different, and the display uniformity of the display panel is influenced. The coupling capacitance formed by the first node N1 of the pixel driving circuit and the anode signal line includes the sum of the band content formed at the position where the first node is directly opposite to the anode signal line and the capacitance formed by the anode signal line at the position around the first node N1.
With continuing reference to fig. 2 and 3 in combination, an embodiment of the invention provides a coupling layer 50 between the pixel driving circuit 20 and the conductive layer 40, the coupling layer 50 including at least one coupling structure 51; the capacitance of the coupling capacitor formed by the first node of each pixel driving circuit 20 located in the second display area 113 and the coupling structure and/or the anode signal line is set within the preset capacitance range, so that the influence of the signal on the coupling structure and/or the anode signal line on the first node of each pixel driving circuit 20 located in the second display area 113 is kept consistent; at this time, the first node of each pixel driving circuit 20 in the second display region 113 may be compensated by other methods to supply a corresponding driving current to each light emitting element, so that each pixel driving circuit can provide a corresponding driving current to each light emitting element accurately, and thus, each light emitting element can emit light stably, the display uniformity of each region of the display panel can be improved, and the display effect of the display panel can be improved.
Alternatively, the anode signal line 41 transmits a driving current supplied to the first light emitting element 31 by the first pixel driving circuit 21; and the coupling structure 51 may receive a corresponding coupling signal, which may be a fixed voltage signal, for example. On the premise that the capacitance of the coupling capacitor formed by the first node of each pixel driving circuit 20 and the coupling structure and/or the anode signal line in the second display region 113 is within the predetermined capacitance range, the embodiment of the present invention does not specifically limit whether the coupling structure receives the coupling signal, and the type of the coupling signal.
Optionally, fig. 5 is a schematic top view structure diagram of another display panel provided in an embodiment of the present invention. As shown in fig. 4 and 5, the display panel 100 may further include a plurality of power signal lines 61; at this time, in the plurality of pixel driving circuits 20 arranged in an array, each pixel driving circuit located in the same row or the same column is electrically connected to the same power signal line 61; the power supply signal line 61 is capable of transmitting a power supply signal PVDD to each pixel driving circuit; at this time, when the coupling signal received by the coupling structure in the display panel is a fixed voltage signal, the fixed voltage signal may be a power signal PVDD received by each pixel driving circuit. Therefore, on one hand, no additional coupling signal is required to be provided for the coupling structure, so that the structure of the display panel can be simplified; on the other hand, the power signal line 61 can transmit the power signal PVDD to the coupling structure while transmitting the power signal PVDD to each pixel driving circuit 20, so that a signal line for transmitting a coupling signal does not need to be additionally arranged in the display area, which is beneficial to improving the aperture ratio of the display panel 100.
The power signal line 61 may be disposed in the same layer as the coupling structure. At this time, the coupling layer may include the power signal line 61 and at least one coupling structure, so that the coupling structure and the power signal line 61 can be prepared by using the same material in the same process, thereby simplifying the process of the display panel 100 and reducing the preparation cost of the display panel 100; and no additional film layer is required for providing the coupling structure, thereby facilitating the thinning of the display panel 100.
It should be noted that fig. 3 and fig. 4 are schematic diagrams illustrating embodiments of the present invention, and fig. 3 and fig. 4 only replace the structure of the pixel driving circuit with one driving transistor and one first node; the pixel driving circuit in the embodiment of the present invention may include a driving transistor, a first node, and other active and/or passive devices, which is not particularly limited in the embodiment of the present invention.
Fig. 6 is a top view of a film layer of a pixel driving circuit according to an embodiment of the invention, fig. 7 is an equivalent circuit diagram of a pixel driving circuit corresponding to fig. 6, and fig. 8 is a schematic view of a film layer structure along a section a-a in fig. 6. As shown in fig. 6 and 7, the pixel driving circuit 20 may include a driving transistor T, an initialization transistor M1, a data writing transistor M2, a threshold compensation transistor M3, a reset transistor M4, light emitting control transistors M5 and M6, and a storage capacitor Cst, and the driving principle thereof is similar to that of the pixel driving circuit of 7T1C in the prior art, and is not described herein again.
Referring to fig. 6 and 8, the pixel driving circuit 20 located at one side of the substrate base plate 10 may include a semiconductor layer 201, a gate metal layer 202, a capacitance metal layer 203, and a signal line layer 204. The semiconductor layer 201 may include an active layer of each transistor in the pixel driving circuit 20, the gate metal layer 202 may include a gate of each transistor in the pixel driving circuit 20, the capacitor metal layer 203 may include a first plate of the storage capacitor Cst, and the signal line layer 204 may include a connection line for connecting each transistor and the capacitor, the power signal line 61 transmitting the power signal PVDD, and the data signal line 62 transmitting the data signal Vdata. At this time, the first node N1 for electrically connecting the gate of the driving transistor T with the second pole of the initialization transistor M1 and the second pole of the threshold compensation transistor M3 is disposed on the signal line layer 204 as a connection line. Since the first node N1 has a larger size than the second electrode of the initialization transistor M1 and the second electrode of the threshold compensation transistor M3, and the film layer where the first node N1 is located is farther from the substrate 10 than the gate of the driving transistor, so that the film layer where the first node is located is closer to the conductive layer, the first node N1 is most affected by the signal transmitted by the anode signal line of the conductive layer, and therefore, when the capacitance of the coupling capacitor formed by the first node N1 of each pixel driving circuit 20 located in the second display region 113 and the anode signal line and/or the coupling structure is within the predetermined capacitance range, the difference in the influence of the coupling signal of the coupling capacitor on the first node N1 of each pixel driving circuit located in the second display region 113 can be reduced, so that the light emitting uniformity of the light emitting elements driven by each pixel driving circuit located in the second display region 113 can be ensured, and further, the display uniformity of the display panel can be improved.
Optionally, fig. 9 is a schematic view of a partial structure of a display panel according to an embodiment of the present invention, and fig. 10 is a schematic view of a partial film structure of a display panel according to an embodiment of the present invention. As shown in fig. 9 and 10, the orthographic projection of each pixel driving circuit 20(21, 23) on the substrate 10 in the second display area 113 is located in the orthographic projection of the coupling structure 51 on the substrate 10. At this time, since the coupling signal received by each coupling structure 51 of the coupling layer is a fixed voltage signal, the coupling structure 51 can shield signals of other film layers located on the side of the coupling structure 51 away from the substrate 10, so as to prevent the signals of the other film layers located on the side of the coupling structure 51 away from the substrate 10 from being coupled to the pixel driving circuit 20 and affecting the potential of the first node of the pixel driving circuit 20.
Accordingly, since the anode signal line 41 is located on a side of the coupling structure 51 away from the pixel driving circuit 20, a signal transmitted on the anode signal line 41 cannot be coupled to each pixel driving circuit 20 located in the second display region 113, that is, the coupling structure 51 serves as a shielding layer, so that the anode signal line 41 and each pixel driving circuit 20 located in the second display region 113 are shielded from each other, and the capacitance of a coupling capacitor formed by each anode signal line 41 and each pixel driving circuit 20 located in the second display region 113 is 0F. In this way, when the coupling amount of the coupling capacitor formed by the anode signal line 41 and each pixel driving circuit 20 located in the second display region 113 is kept consistent, each pixel driving circuit 20 can supply a stable driving current to the corresponding light emitting element to drive each light emitting element to stably emit light, so that the light emitting conditions of each light emitting element are kept consistent, the display uniformity of the display panel is improved, and the display effect of the display panel is improved.
Illustratively, referring to fig. 5, 9 and 10 in combination, when the pixel driving circuits 20 located in the second display area 113 are arranged in an array, the coupling layer may include a plurality of coupling structures 51, and in the second display area 113, the orthographic projections of the pixel driving circuits 20 located in the same row on the substrate base plate 10 are located in the orthographic projection of the same coupling structure 51 on the substrate base plate 10. Wherein the first direction X is a row direction of the pixel driving circuit 20, or the second direction Y is a row direction of the pixel driving circuit 20; in this manner, when the anode signal lines 41 extend in the row direction of the pixel driving circuits 20, the coupling structures 51 can shield the pixel driving circuits 20 in the same row and the anode signal lines 41 electrically connected to the first pixel driving circuits 21 in the same row from each other.
It should be noted that, in fig. 9, the arrangement of the first light emitting elements 31 located in the high light transmittance region 111 is an exemplary arrangement according to the embodiment of the present invention; besides, the arrangement of the first light emitting elements in the high light transmittance region can also be as shown in fig. 11. On the premise of realizing the core invention point of the embodiment of the present invention, the embodiment of the present invention does not specifically limit the arrangement manner of the first light emitting elements located in the high light transmittance region. Meanwhile, the arrangement of the first light emitting elements in the high light transmission region may be the same as or different from the arrangement of the light emitting elements in the first display region and/or the second display region, which is not specifically limited in this embodiment of the present invention. For convenience of description, the embodiments of the present invention exemplarily explain technical solutions of the embodiments of the present invention in an arrangement manner of each first light emitting element shown in fig. 9.
Optionally, fig. 12 is a schematic partial structure diagram of another display panel according to an embodiment of the present invention. As shown in fig. 10 and 12, an orthogonal projection of at least a portion of the anode signal lines 41 located in the second display region 113 on the substrate 10 is located within an orthogonal projection of the coupling structure 51 on the substrate 10; that is, the orthographic projections of the anode signal lines 41 in the second display area 113 on the substrate base plate 10 may all be located in the coupling structures 51, and the orthographic projections of the pixel driving circuits 20 in the second display area 113 on the substrate base plate 10 may overlap with the orthographic projections of the coupling structures 51 on the substrate base plate 10, but not all of the anode signal lines are located in the orthographic projections of the coupling structures 51 on the substrate base plate 10.
At this time, when the anode signal lines positioned in the second display region extend in the row direction, the anode signal lines 41 electrically connected to the first pixel driving circuits 21 in the same row may have an overlap with the same coupling structure; alternatively, when the anode signal lines positioned in the second display region extend in the column direction, the anode signal lines 41 electrically connected to the first pixel driving circuits 21 in the same column may have an overlap with the same coupling structure; alternatively, when the coupling layer includes a plurality of coupling structures, the respective anode signal lines 41 having an overlap with the coupling structures 51 are disposed in one-to-one correspondence with the respective coupling structures 51 in a direction perpendicular to the plane of the base substrate 10.
When the anode signal lines 41 overlapping with the coupling structures 51 are arranged in one-to-one correspondence with the coupling structures 51 in the direction perpendicular to the plane of the substrate base plate 10, the difference between the width of the short side of the coupling structure 51 and the width of the short side of the anode signal line 41 is greater than or equal to 5 μm, that is, the width L1 of the coupling structure 51 in the second direction Y is greater than the width L2 of the anode signal line 41 in the second direction Y, and L1-L2 is greater than or equal to 5 μm, so that the coupling structure 51 can completely shield the anode signal line 41 with the overlapping anode; meanwhile, since the coupling structure 51 receives the coupling signal, setting the coupling structure 51 to have a wider width is advantageous to reduce the resistance of the coupling structure 51 itself, so that the coupling signals at various positions can be kept consistent, and the power consumption of the display panel can be reduced.
As described above, since the orthographic projection of each anode signal line 41 located in the second display region 113 on the substrate 10 is located in the orthographic projection of the coupling structure 51 on the substrate 10, the coupling structure 51 can also serve as a shielding structure for shielding each anode signal line 41 and each pixel driving circuit located in the second display region 113 from each other.
In addition, optionally, fig. 13 is a schematic partial structure diagram of another display panel provided in an embodiment of the present invention, and fig. 14 is a schematic structural diagram of a film layer of a section B-B in fig. 13. As shown in fig. 13 and fig. 14, in a direction Z perpendicular to the plane of the substrate 10, a portion of the anode signal lines 41(411) does not overlap with the coupling structure 51, and the anode signal line 41 that does not overlap with the coupling structure 51 is a first anode signal line 411, and the first anode signal line 411 is not shielded by the coupling structure 51; at this time, in a direction Z perpendicular to the plane of the substrate base plate 10, each pixel driving circuit (211, 212, 213) and the first anode signal line 411 in the second display area 113 have a first overlapping area 401, and the area of each first overlapping area 401 is within a first preset area range.
Since the capacitance is proportional to the area of the plate thereof under the premise that other parameters are consistent, the overlapping area of each pixel driving circuit (211, 212, 213) located in the second display region 113 and the first anode signal line 411 that does not overlap with the coupling structure 51 is set within a first predetermined area range, which may be [ a 1-5% a1, a1+ 5% a1], for example, where a1 is the average area of each first overlapping region 401, so that the capacitance of the coupling capacitance formed by each pixel driving circuit (211, 212, 213) and each first anode signal line 411 is within a predetermined range; in this way, the signal amount of each first anode signal line 411 coupled to each pixel driving circuit in the second display region 113 can be ensured to be consistent, thereby being beneficial to improving the display uniformity of the display panel.
When the pixel driving circuits (211, 212, 213) in the second display region 113 are arranged in an array, and the anode signal line 41 in the second display region 113 extends along the first direction X, if the first direction X is a row direction of the pixel driving circuits (211, 212, 213), the first anode signal line 411 may be an anode signal line electrically connected to the first pixel driving circuit 211 farthest from the high-light-transmission region 111 in each of the first pixel driving circuits (211, 212, 213) in the same row; alternatively, when the first direction X is a column direction of the pixel driving circuits (211, 212, 213), the first anode signal line 411 is an anode signal line electrically connected to the first pixel driving circuit 211 farthest from the high light-transmitting region 111 among the first pixel driving circuits (211, 212, 213) located in the same column. Thus, the first anode signal line 411 passes through the pixel driving circuits (212, 213) located in the same row or the same column and located between the first pixel driving circuit 211 and the high-transmittance region 111, so that the first anode signal line 411 and the pixel driving circuits (211, 212, 213) located in the same row or/the same column are overlapped, and the overlapping area is within the first predetermined area range, thereby ensuring the display uniformity of the display panel.
Optionally, fig. 15 is a schematic partial structure diagram of another display panel provided in the embodiment of the present invention. As shown in fig. 3 and fig. 15, the coupling layer 50 may include a plurality of coupling structures 51, and in a direction Z perpendicular to the plane of the substrate, each pixel driving circuit and the coupling structure 51 and/or the anode signal line 41 in the second display area 113 have a second overlapping area 412, and an area of each second overlapping area 412 is within a second predetermined area range. The second predetermined area range may be, for example, [ a 2-5% a2, a2+ 5% a2], and a2 is an average area of the second overlapping regions 412.
For example, when the pixel driving circuit 213 in the second display region 113 only overlaps the anode signal lines 41, the total overlapping area between the pixel driving circuit 213 and each anode signal line 41 is the second overlapping area 412 corresponding to the pixel driving circuit 213; when the pixel driving circuit 212 in the second display region 113 overlaps the anode signal lines 41 and the coupling structures 51, the total overlapping area of the pixel driving circuit 212 and each of the anode signal lines 41 and the coupling structures 51 is the second overlapping area 412 corresponding to the pixel driving circuit 212; when the pixel driving circuit 214 located in the second display area 113 only has an overlap with the coupling structure 51, the total overlapping area of the pixel driving circuit 214 and the coupling structure 51 is the second overlapping area 412 corresponding to the pixel driving circuit 214. Each coupling structure 51 can be electrically connected to one anode signal line 41, that is, the coupling signal received by the coupling structure 51 is the signal transmitted on the anode signal line 41 electrically connected thereto; alternatively, the coupling structure may receive a coupling signal provided by another source, which is not specifically limited in this embodiment of the present invention.
In this way, by setting the overlapping area of each pixel driving circuit in the second display area 113 and the coupling structure 51 and/or the anode signal line 41 within the second preset area range, the coupling capacitance formed by the coupling structure 51 and the pixel driving circuit correspondingly compensates the coupling capacitance formed by each pixel driving circuit and the anode signal line 41, so that the capacitance of the coupling capacitance formed by each pixel driving circuit in the second display area 113 and the coupling structure 51 and/or the anode signal line 41 is kept consistent, thereby being beneficial to improving the display uniformity of the display panel.
Alternatively, with continuing reference to fig. 3 and 15, the pixel driving circuits 20 located in the second display region 113 include a first type of pixel driving circuit 21A and a second type of pixel driving circuit 21B; in a direction Z perpendicular to the plane of the base substrate 10, the number of the anode signal lines 41 overlapping the first-type pixel driving circuit 21A is n1, and the overlapping area of the first-type pixel driving circuit 21A and the coupling structure 51A is S1; the number of the anode signal lines 41 overlapping with the second type pixel driving circuit 21B is n2, and the overlapping area of the second type pixel driving circuit 21B and the coupling structure 51B is S2; wherein, when n1 is more than n2, S1 is less than S2.
Illustratively, when the number n1 of the anode signal lines 41 overlapping the first-type pixel driving circuits 21A is 1 two and the number n2 of the anode signal lines 41 overlapping the second-type pixel driving circuits 21B is 5 two, the number of the anode signal lines overlapping the first-type pixel driving circuits 21A is larger than the number of the anode signal lines overlapping the second-type pixel driving circuits 21B, so that the coupling capacitance formed by the first-type pixel driving circuits 21A and the anode signal lines 41 is smaller than the coupling capacitance formed by the second-type pixel driving circuits 21B and the anode signal lines 41. At this time, the area of the coupling structure 51A overlapping with the first-type pixel driving circuit 21A is larger than the area of the coupling structure 51B overlapping with the second-type pixel driving circuit 21B, so that the coupling capacitance formed by the first-type pixel driving circuit 21A and the coupling structure 51A is larger than the coupling capacitance formed by the second-type pixel driving circuit 21B and the coupling structure 51B, and the capacitance of the coupling capacitance formed by each pixel driving circuit 20 located in the second display region and the coupling structure 51 and/or the anode signal line 41 can be ensured to be consistent, so that the light-emitting luminance of the light-emitting element driven by each pixel driving circuit located in the second display region is kept consistent, and the display uniformity of the display panel is improved.
Based on the same inventive concept, embodiments of the present invention further provide a display device, where the display device includes the display panel provided by the embodiments of the present invention, and therefore the display device also has technical features and beneficial effects of the display panel provided by the embodiments of the present invention, and the same points can be understood with reference to the above description, and are not described again below.
For example, fig. 16 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 16, the display device includes a display panel 100 provided in the embodiment of the present invention, and the display device may be a mobile phone, a tablet computer, a smart wearable device (e.g., a smart watch), and other display devices with fingerprint identification function known to those skilled in the art, which is not limited thereto in the embodiment of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. A display panel, comprising: a display area; the display area comprises a high-light-transmission area, a first display area surrounding the high-light-transmission area and a second display area positioned between the first display area and the high-light-transmission area;
the display panel further includes:
a substrate base plate;
a plurality of pixel driving circuits located at one side of the substrate base plate; each of the pixel driving circuits includes a driving transistor and a first node electrically connected to a gate of the driving transistor; the pixel driving circuit includes a first pixel driving circuit; at least part of the first pixel driving circuit is positioned in the second display area;
the plurality of light-emitting elements are positioned on one side, away from the substrate, of the pixel driving circuit and are arranged in one-to-one correspondence with the pixel driving circuits; the light emitting elements are positioned in the first display area, the second display area and the high light-transmitting area, and the light emitting elements positioned in the high light-transmitting area are first light emitting elements;
the conducting layer is positioned on one side, away from the substrate, of the pixel driving circuit; the conductive layer includes a plurality of anode signal lines; each first light-emitting element is electrically connected with each first pixel driving circuit in a one-to-one correspondence manner through each anode signal line; the anode signal line is used for transmitting a driving current generated by a driving transistor of the first pixel driving circuit to the first light-emitting element;
a coupling layer located between the conductive layer and the pixel driving circuit and insulated from the anode signal line and the pixel driving circuit; the coupling layer comprises at least one coupling structure;
the coupling layer comprises a plurality of coupling structures; the coupling structures receive coupling signals, and the coupling signals received by the coupling structures are fixed voltage signals; each pixel driving circuit array arranged in the second display area; the orthographic projections of the pixel driving circuits on the substrate base plate, which are positioned in the second display area, are positioned in the orthographic projection of the coupling structure on the substrate base plate, and the orthographic projections of the pixel driving circuits on the substrate base plate, which are positioned in the same row, are positioned in the orthographic projection of the same coupling structure on the substrate base plate;
or, the coupling structures receive coupling signals, and the coupling signals received by each coupling structure are fixed voltage signals; the orthographic projection of part of the anode signal lines in the second display area on the substrate base plate is positioned in the orthographic projection of the coupling structure on the substrate base plate, and in the direction perpendicular to the plane of the substrate base plate, part of the anode signal lines and the coupling structure are not overlapped with each other, and the anode signal lines which are not overlapped with the coupling structure are first anode signal lines; in a direction perpendicular to the plane of the substrate base plate, each pixel driving circuit and the first anode signal line in the second display area are provided with a first overlapping area, and the area of each first overlapping area is within a first preset area range; the first preset area range is [ S-5% S, S + 5% S ]; s is a fixed value;
alternatively, the coupling layer comprises a plurality of the coupling structures; in a direction perpendicular to the plane of the substrate base plate, each pixel driving circuit and the coupling structure and/or the anode signal line in the second display area have a second overlapping area, and the area of each second overlapping area is within a second preset area range; the second predetermined area range is [ S '-5% S', S '+ 5% S' ]; s' is a fixed value;
and the capacitance of a coupling capacitor formed by the first node of each pixel driving circuit in the second display area and the coupling structure and/or the anode signal line is within a preset capacitance range.
2. The display panel according to claim 1, wherein when each of the pixel driving circuits and the first anode signal line in the second display region have a first overlapping area in a direction perpendicular to a plane of the substrate base plate, and an area of each of the first overlapping areas is within a first preset area range, each of the pixel driving circuits in the second display region is arranged in an array;
the anode signal line positioned in the second display area extends along a first direction;
when the first direction is a row direction of the pixel driving circuits, the first anode signal line is electrically connected with the first pixel driving circuit which is located in each first pixel driving circuit in the same row and farthest from the high light-transmitting area;
or, when the first direction is a column direction of the pixel driving circuits, the first anode signal line is electrically connected to the first pixel driving circuit farthest from the high-transmittance region in each of the first pixel driving circuits in the same column.
3. The display panel according to claim 1, wherein the coupling layer includes a plurality of coupling structures when an orthogonal projection of a part of the anode signal lines on the substrate base plate located in the second display region is located within an orthogonal projection of the coupling structures on the substrate base plate;
in the direction perpendicular to the plane of the substrate base plate, the anode signal lines and the coupling structures which are overlapped with the coupling structures are arranged in a one-to-one correspondence mode.
4. The display panel according to claim 3, wherein a difference between a width of a short side of the coupling structure and a width of a short side of the anode signal line is greater than or equal to 5 μm.
5. The display panel according to claim 1, further comprising: a plurality of power signal lines;
each pixel driving circuit is arranged in an array; each pixel driving circuit positioned in the same row or the same column is electrically connected with the same power signal wire; the power signal line is used for transmitting a power signal to each pixel driving circuit;
when the coupling structures receive coupling signals and the coupling signals received by each coupling structure are fixed voltage signals, the fixed voltage signals are the power signals.
6. The display panel according to claim 5, wherein the power signal line is provided in a same layer as the coupling structure.
7. The display panel according to claim 1, wherein the pixel driving circuits in the second display region include a first type of pixel driving circuit and a second type of pixel driving circuit;
in the direction perpendicular to the plane of the substrate base plate, the number of the anode signal lines overlapped with the first pixel driving circuit is n1, and the overlapping area of the first pixel driving circuit and the coupling structure is S1; the number of the anode signal lines overlapping with the second type of pixel driving circuit is n2, and the overlapping area of the second type of pixel driving circuit and the coupling structure is S2; wherein, when n1 is more than n2, S1 is less than S2.
8. A display device comprising the display panel according to any one of claims 1 to 7.
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| CN112909056B (en) * | 2021-01-26 | 2023-08-08 | 京东方科技集团股份有限公司 | Display panel, manufacturing method thereof and display device |
| CN114863860A (en) * | 2021-01-29 | 2022-08-05 | 武汉天马微电子有限公司 | Display panel and display device |
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| CN115241226A (en) * | 2021-04-23 | 2022-10-25 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN113178537B (en) * | 2021-04-27 | 2023-01-17 | 武汉天马微电子有限公司 | Display panel and display device |
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| CN113990909A (en) * | 2021-10-28 | 2022-01-28 | 京东方科技集团股份有限公司 | Display panel and display device |
| WO2023092351A1 (en) * | 2021-11-24 | 2023-06-01 | 京东方科技集团股份有限公司 | Display substrate and display apparatus |
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