CN108039357B - Organic light-emitting display panel and electronic equipment - Google Patents
Organic light-emitting display panel and electronic equipment Download PDFInfo
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- CN108039357B CN108039357B CN201711244170.4A CN201711244170A CN108039357B CN 108039357 B CN108039357 B CN 108039357B CN 201711244170 A CN201711244170 A CN 201711244170A CN 108039357 B CN108039357 B CN 108039357B
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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
- H10K59/122—Pixel-defining structures or layers, e.g. banks
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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
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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
- H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
- H10K59/1216—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements the pixel elements being capacitors
Abstract
The embodiment of the invention discloses an organic light-emitting display panel and electronic equipment, wherein the organic light-emitting display panel comprises: a first pixel defining layer defining a first opening area, the first color light emitting device being located in the first opening area, the first pixel defining layer including a first region and a second region, the first pixel defining layer corresponding to the first region having a first thickness, the first pixel defining layer corresponding to the second region having a second thickness, the first thickness being less than the second thickness; the first compensation electrode overlaps at least the first region; the first compensation capacitor is composed of a second electrode, a first compensation electrode, and an interlayer between the second electrode and the first compensation electrode; in the first region, the distance between the first compensation electrode and the second electrode is less than the second thickness. In the embodiment of the invention, the distance between the first compensation electrode and the second electrode is reduced, so that the OLED capacitance of the first color light-emitting device is increased, and the problem that the dark state of the first color light-emitting device is not dark is solved.
Description
Technical Field
Embodiments of the present invention relate to display technologies, and in particular, to an organic light emitting display panel and an electronic device.
Background
An Organic Light-Emitting Diode (OLED) display device is a self-luminous display device in which an Organic Light-Emitting layer located between a cathode and an anode is used as a Light-Emitting body, and has advantages of being ultra-thin, high in brightness, high in Light-Emitting efficiency, good in shock resistance, and the like.
The organic light emitting diode display device includes light emitting devices of a plurality of colors, display states of the light emitting devices include a dark state and a bright state, the light emitting devices do not emit light when the light emitting devices are in the dark state, and the light emitting devices emit light when the light emitting devices are in the bright state. However, when the light emitting device of the conventional organic light emitting diode display device is in a dark state, the light emitting device emits light, i.e., shines, so that the dark state of the light emitting device is not dark, and the display effect of the organic light emitting diode display device is influenced.
Disclosure of Invention
Embodiments of the present invention provide an organic light emitting display panel and an electronic device to improve a problem that a light emitting device is not dark.
In a first aspect, an embodiment of the present invention provides an organic light emitting display panel, including:
a first substrate;
the light-emitting devices are positioned on the first substrate and comprise first electrodes, organic light-emitting layers and second electrodes, the organic light-emitting layers are positioned between the first electrodes and the second electrodes, the first electrodes of any two adjacent light-emitting devices are arranged in an insulating mode, and the first electrodes and the second electrodes are arranged in an insulating mode;
the plurality of light emitting devices include at least a first color light emitting device, a second color light emitting device, and a third color light emitting device, wherein a first electrode of the first color light emitting device includes a first display electrode and a first compensation electrode electrically connected to each other, the first display electrode being in contact with the organic light emitting layer;
the organic light emitting display panel comprises a first substrate, a second substrate, a pixel definition layer, a first color light emitting device, a second color light emitting device, a third color light emitting device and a third pixel definition layer, wherein the first substrate is provided with a first opening area, the second substrate is provided with a second opening area, the third substrate is provided with a third opening area, the first pixel definition layer is positioned on the first substrate, the pixel definition layer comprises a first pixel definition layer, a second pixel definition layer and a third pixel definition layer, the first pixel definition layer defines the second opening area, the third pixel definition layer defines the third opening area, the first color light emitting device is positioned in the second opening area, the third color light emitting device is positioned in the third opening area, the first pixel definition layer comprises a first area and a second area, the first thickness is smaller than the second thickness, the first thickness and the second thickness are the size along the direction perpendicular to the organic light emitting display panel, and the first opening area corresponds to at least one first area; the first compensation electrode overlaps at least the first region;
at least one first compensation capacitor composed of a second electrode, a first compensation electrode, and an interlayer between the second electrode and the first compensation electrode;
in the first region, the distance between the first compensation electrode and the second electrode is less than the second thickness.
In a second aspect, embodiments of the present invention also provide an electronic device, which includes the organic light emitting display panel described above.
In the embodiment of the invention, the first compensation electrode, the second electrode and the interlayer between the first compensation electrode and the second electrode form a first compensation capacitor of the first color light emitting device, the first display electrode, the second electrode and the interlayer between the first display electrode and the second electrode form a first display capacitor of the first color light emitting device, and the sum of the first compensation capacitor and the first display capacitor forms an OLED capacitor of the first color light emitting device. In the embodiment of the invention, the first pixel defining layer with a relatively thin thickness is arranged in the region corresponding to the first compensation electrode, so that the distance between the first compensation electrode and the second electrode can be reduced, the capacitance value of the first compensation capacitor is effectively improved, and the OLED capacitance of the first color light emitting device is further increased, thereby improving the problem that the dark state of the first color light emitting device is not dark due to the leakage current of the driving transistor of the pixel circuit corresponding to the first color light emitting device, and improving the display effect of the organic light emitting display panel.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are 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 schematic diagram of an organic light emitting display panel according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along A-A' of FIG. 1;
FIG. 3 is another cross-sectional view taken along A-A' of FIG. 1;
fig. 4 is a schematic diagram of an organic light emitting display panel according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view taken along line B-B' of FIG. 4;
FIG. 6 is another cross-sectional view taken along line B-B' of FIG. 4;
fig. 7 is a schematic diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 8 is a schematic view of an organic light emitting display panel according to an embodiment of the present invention;
fig. 9 is a schematic view of an organic light emitting display panel according to an embodiment of the present invention;
fig. 10 is a schematic view of an organic light emitting display panel according to an embodiment of the present invention;
fig. 11 is a schematic diagram of an organic light emitting display panel according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.
Referring to fig. 1, a schematic diagram of an organic light emitting display panel according to an embodiment of the present invention is shown, fig. 2 is a cross-sectional view taken along a-a 'of fig. 1, and fig. 3 is another cross-sectional view taken along a-a' of fig. 1. The organic light emitting display panel provided by the embodiment includes: a first substrate 10; a plurality of light emitting devices 20 positioned on the first substrate 10, wherein each light emitting device 20 comprises a first electrode 21, an organic light emitting layer 22 and a second electrode 23, the organic light emitting layer 22 is positioned between the first electrode 21 and the second electrode 23, the first electrodes 21 of any two adjacent light emitting devices 20 are arranged in an insulating way, and the first electrodes 21 and the second electrodes 23 are arranged in an insulating way; the plurality of light emitting devices 20 include at least a first color light emitting device 20a, a second color light emitting device 20b, and a third color light emitting device 20c, wherein the first electrode 21 of the first color light emitting device 20a includes a first display electrode 21a and a first compensation electrode 21b electrically connected to each other, and the first display electrode 21a is in contact with the organic light emitting layer 22; a pixel defining layer 30 on the first substrate 10, the pixel defining layer 30 including a first pixel defining layer 31b defining a first open area 31a, a second pixel defining layer 32b defining a second open area 32a, and a third pixel defining layer 33b defining a third open area 33a, a first color light emitting device 20a positioned in the first open area 31a, a second color light emitting device 20b positioned in the second open area 32a, and a third color light emitting device 20c positioned in the third open area 33a, wherein the first pixel defining layer 31b includes a first region 311 and a second region 312, the first pixel defining layer 31b corresponding to the first region 311 has a first thickness d1, the first pixel defining layer 31b corresponding to the second region 312 has a second thickness d2, the first thickness d1 is smaller than the second thickness d2, and the first thickness d1 and the second thickness d2 are each a dimension in a direction perpendicular to the organic light emitting display panel, the first open area 31a corresponds to at least one first region 311; the first compensation electrode 21b overlaps at least the first region 311; at least one first compensation capacitor C1, the first compensation capacitor C1 being composed of the second electrode 23, the first compensation electrode 21b, and an interlayer between the second electrode 23 and the first compensation electrode 21 b; in the first region 311, the distance between the first compensation electrode 21b and the second electrode 23 is smaller than the second thickness d 2.
In this embodiment, the first substrate 10 is an array substrate of an organic light emitting display panel, the array substrate at least includes a substrate 11 and a thin film transistor array, the thin film transistors may form a pixel circuit 12, and each light emitting device 20 is electrically connected to one pixel circuit 12. Only the light emission control transistor in the pixel circuit 12, which is electrically connected to the light emitting device 20, is illustrated in this embodiment.
In the present embodiment, a plurality of light emitting devices 20 are disposed on the first substrate 10, each light emitting device 20 includes a first electrode 21, an organic light emitting layer 22, and a second electrode 23, the organic light emitting layer 22 is disposed between the first electrode 21 and the second electrode 23, the first electrodes 21 of any two adjacent light emitting devices 20 are disposed in an insulating manner, and the first electrodes 21 and the second electrodes 23 are disposed in an insulating manner. The first electrode 21 is an independent electrode, that is, one first electrode 21 is correspondingly disposed for each light emitting device 20, and the optional second electrode 23 is a planar electrode, that is, one second electrode 23 is shared by a plurality of light emitting devices 20. Typically, the first electrode 21 is an anode and the second electrode 23 is a cathode. In the present embodiment, the plurality of light emitting devices 20 includes at least a first color light emitting device 20a, a second color light emitting device 20b, and a third color light emitting device 20 c.
The light emitting device 20 provided in the present embodiment emits light in the following principle: taking the first color light emitting device 20a as an example, a positive voltage is applied to the first electrode 21 corresponding to the first color light emitting device 20a and a negative voltage is applied to the second electrode 23, holes generated by the first electrode 21 of the first color light emitting device 20a are injected into the organic light emitting layer 22 of the first color light emitting device 20a, electrons generated by the second electrode 23 are injected into the organic light emitting layer 22, the electrons and holes injected into the organic light emitting layer 22 of the first color light emitting device 20a are recombined and excite light emitting molecules in the organic light emitting layer 22 to generate excitons, and the exciton radiation transition causes the first color light emitting device 20a to emit light.
Each light emitting device is electrically connected to the pixel circuit, and specifically, a first electrode (i.e., an anode) of each light emitting device is electrically connected to a drain of the light emission control transistor of the corresponding pixel circuit, and a source of the light emission control transistor is electrically connected to a drain of the driving transistor. When the pixel circuit works, a data signal is transmitted to the grid electrode of the driving transistor, and the driving transistor can drive the light-emitting device to emit light when the driving transistor is in a conducting state under the control of the data signal; the light emitting device does not emit light when the driving transistor is in an off state under the control of the data signal. In the light emitting stage, the light emitting device does not emit light, namely the light emitting device is in a dark state, and the light emitting device emits light, namely the light emitting device is in a bright state; in the light emitting stage, the light emitting control transistor is in a conducting state, the conducting or the cutting-off state of the driving transistor determines whether the light emitting device emits light or not, when the driving transistor is in a cutting-off state due to a signal received by the grid electrode of the driving transistor, the pixel circuit controls the light emitting device to be in a dark state, namely, not to emit light, and when the driving transistor is in a conducting state due to a signal received by the grid electrode of the driving transistor, the pixel circuit controls the light emitting device to be in a bright state, namely, to emit light.
In the light emitting stage, when the driving transistor is turned off by a signal received by the gate of the driving transistor, the light emitting device should be in a dark state, i.e., not emitting light. However, a leakage current exists between the source and the drain of the driving transistor, the leakage current can slowly raise the potential of the anode when flowing through the turned-on light-emitting control transistor, and when the potential of the anode is raised and reaches the turn-on voltage of the light-emitting device, the light-emitting device in a dark state emits light, i.e., shines secretly, so that the dark state of the light-emitting device is not dark. The light emitting device includes an organic light emitting device OLED capacitor that is formed of an anode and a cathode of the light emitting device and an interlayer between the anode and the cathode. If the OLED capacitance of the light-emitting device is larger, the anode potential is lifted more slowly due to the leakage current of the driving transistor, so that the OLED capacitance of the light-emitting device is improved, the light-emitting device can be prevented from being stolen, and the dark state of the light-emitting device is improved.
In the organic light emitting display panel, the driving transistor of the pixel circuit 12 corresponding to each color light emitting device has a leakage current, which may cause the problem that the dark state of each color light emitting device is not dark. While increasing the OLED capacitance of the light emitting device 20 can improve the dark state of the light emitting device 20, in this embodiment, adding the first compensation capacitor C1 to the first color light emitting device 20a can at least improve the dark state of the first color light emitting device 20a in the organic light emitting display panel. As will be understood by those skilled in the art, in other embodiments, a compensation capacitor may be added to each color light emitting device in the organic light emitting display panel, so that the dark state of each color light emitting device is improved, and the display effect of the organic light emitting display panel as a whole is improved. The OLED capacitance of the light emitting device 20 in the present embodiment is composed of a first electrode 21, a second electrode 23, and an interlayer between the first electrode 21 and the second electrode 23.
In the present embodiment, the first electrode 21 of the first color light emitting device 20a includes a first display electrode 21a and a first compensation electrode 21b electrically connected to each other, and the first display electrode 21a is in contact with the organic light emitting layer 22. When a positive voltage is applied to the first display electrode 21a, the first display electrode 21a generates holes and injects the holes into the organic light emitting layer 22 to assist light emission, so that the first display electrode 21a of the first color light emitting device 20a participates in display; meanwhile, a negative voltage is applied to the second electrode 23, and the first display electrode 21a, the second electrode 23, and the interlayer between the first display electrode 21a and the second electrode 23 form a first display capacitor of the first color light emitting device 20 a. The first display electrode 21a and the first compensation electrode 21b of the first color light emitting device 20a are electrically connected, and the first compensation electrode 21b, the second electrode 23, and the interlayer between the first compensation electrode 21b and the second electrode 23 also form a first compensation capacitor C1 of the first color light emitting device 20a when a positive voltage is applied to the first display electrode 21a and a negative voltage is applied to the second electrode 23. The sum of the capacitance values of the first compensation capacitor C1 and the first display capacitor constitutes the OLED capacitance of the first color light emitting device 20 a.
In the present embodiment, the region of the light emitting device 20 is defined using the pixel defining layer 30. The pixel defining layer 30 includes a first pixel defining layer 31b defining a first open region 31a, a second pixel defining layer 32b defining a second open region 32a, and a third pixel defining layer 33b defining a third open region 33a, the first color light emitting device 20a being located at the first open region 31a, the second color light emitting device 20b being located at the second open region 32a, and the third color light emitting device 20c being located at the third open region 33 a. According to the capacitance formula C ═ S/4 pi kd, it is known that the distance between the first compensation electrode 21b and the second electrode 23 affects the size of the first compensation capacitor C1, and at least the first pixel defining layer 31b is included between the first compensation electrode 21b and the second electrode 23, the thinner the thickness of the first pixel defining layer 31b between the first compensation electrode 21b and the second electrode 23 is, the larger the capacitance value of the first compensation capacitor C1 is increased, the thicker the thickness of the first pixel defining layer 31b between the first compensation electrode 21b and the second electrode 23 is, and the smaller the capacitance value of the first compensation capacitor C1 is increased.
In this embodiment, the first pixel defining layer 31b includes a first region 311 and a second region 312, the first pixel defining layer 31b corresponding to the first region 311 has a first thickness d1, the first pixel defining layer 31b corresponding to the second region 312 has a second thickness d2, the first thickness d1 is smaller than the second thickness d2, the first thickness d1 and the second thickness d2 are both dimensions in a direction perpendicular to the organic light emitting display panel, and the first opening region 31a corresponds to at least one first region 311; the first compensation electrode 21b overlaps at least the first region 311. By providing the first pixel defining layer 31b with a relatively small thickness in the region corresponding to the first compensation electrode 21b, the distance between the first compensation electrode 21b and the second electrode 23 can be reduced, the capacitance of the first compensation capacitor C1 can be effectively increased, and the OLED capacitance of the first color light emitting device 20a can be further increased, so that the problem that the dark state of the first color light emitting device 20a is not dark due to the leakage current of the driving transistor of the pixel circuit 12 corresponding to the first color light emitting device 20a is solved, and the display effect of the organic light emitting display panel is improved. The first color light emitting device 20a may be selected to be a red light emitting device, a green light emitting device, or a blue light emitting device.
If the pixel definition layer is thinned as a whole, although the effect of reducing the distance between the first compensation electrode and the second electrode can be achieved, the isolation effect of the pixel definition layer may be poor. In this embodiment, the first pixel defining layer 31b is locally thinned by forming a groove in the first region 311 of the first pixel defining layer 31b, so as to achieve the effect of reducing the distance between the first compensation electrode 21b and the second electrode 23; meanwhile, the second region 312 of the first pixel defining layer 31b is not thinned, so that the overall thickness of the pixel defining layer 30 is maintained, and the effect of isolating different light emitting devices 20 by the pixel defining layer 30 is ensured.
Alternatively, as shown in fig. 1 and 2, a second region 312 is provided between the first region 311 and the first opening region 31a in a direction X parallel to the organic light emitting display panel, and the first region 311 includes a groove having a bottom surface and sidewalls, which are formed by the first pixel defining layer 31 b. The optional bottom surface is located on the side of the first pixel defining layer 31b adjacent to the second electrode 23. In this embodiment, the first pixel defining layer 31b corresponding to the first compensation electrode 21b is recessed to form the first region 311 with a relatively thin thickness, so that the distance between the first compensation electrode 21b and the second electrode 23 can be reduced, the capacitance of the first compensation capacitor C1 can be effectively increased, and the OLED capacitance of the first color light emitting device 20a can be further increased, thereby improving the problem that the first color light emitting device 20a is not dark, and improving the display effect of the organic light emitting display panel.
In addition, the pixel defining layer 30 is disposed on the first substrate 10, and the second electrode 23 extends along the sidewall and the bottom surface of the groove in the first pixel defining layer 31b, increasing the contact area of the second electrode 23 and the pixel defining layer 30, and also enhancing the adhesion of the second electrode 23 and the first substrate 10.
The recess in the first region 311 may be formed simultaneously with the formation of the pixel defining layer 30 by using a half-tone mask method, that is, the pixel defining layer 30 and the first region 311 are formed simultaneously by using one process without increasing the number of manufacturing processes.
Alternatively, as shown in fig. 1 and 3, a second region 312 is provided between the first region 311 and the first opening region 31a in a direction X parallel to the organic light emitting display panel, and the first region 311 includes a groove having a bottom surface and sidewalls, which are formed by the first pixel defining layer 31 b. The optional bottom surface is located on a side of the first pixel defining layer 31b away from the second electrode 23. In the embodiment, the first substrate 10 includes the planarization layer 13, a protrusion is disposed in the planarization layer 13 corresponding to the first compensation electrode 21b, that is, a groove facing the planarization layer 13 is disposed in the first pixel defining layer 31b, so as to form the first region 311 with a thinner thickness in the first pixel defining layer 31b, which can reduce the distance between the first compensation electrode 21b and the second electrode 23, effectively increase the capacitance of the first compensation capacitor C1, further increase the OLED capacitance of the first color light emitting device 20a, thereby improving the problem that the first color light emitting device 20a is not dark, and improving the display effect of the organic light emitting display panel.
In addition, the first compensation electrode 21b extends along the sidewall and the bottom surface of the groove facing the planarization layer 13 in the first pixel defining layer 31b, increasing the contact area of the first compensation electrode 21b and the planarization layer 13, which may enhance the adhesion of the first compensation electrode 21b and the first substrate 10.
Alternatively, as shown in fig. 4 and 5, the first region 311 is contiguous with the first opening region 31a, and the first region 311 includes a groove having a bottom surface and sidewalls, which are formed by the first pixel defining layer 31 b. The optional bottom surface is located on the side of the first pixel defining layer 31b adjacent to the second electrode 23. Fig. 5 is a cross-sectional view taken along line B-B' of fig. 4. In this embodiment, the first pixel defining layer 31b corresponding to the first compensation electrode 21b is provided with a slot connected to the first opening region 31a to form the first region 311 with a relatively small thickness, so that the distance between the first compensation electrode 21b and the second electrode 23 can be reduced, the capacitance of the first compensation capacitor C1 can be effectively increased, and the OLED capacitance of the first color light emitting device 20a can be further increased, thereby improving the problem that the first color light emitting device 20a is not dark, and improving the display effect of the organic light emitting display panel.
In addition, the pixel defining layer 30 is disposed on the first substrate 10, and the second electrode 23 extends along the sidewall and the bottom surface of the groove in the first pixel defining layer 31b, increasing the contact area of the second electrode 23 and the pixel defining layer 30, and also enhancing the adhesion of the second electrode 23 and the first substrate 10.
Alternatively, as shown in fig. 6, the first region 311 is contiguous with the first opening region 31a, and the first region 311 includes a groove having a bottom surface and sidewalls, which are formed by the first pixel defining layer 31 b. The optional bottom surface is located on a side of the first pixel defining layer 31b away from the second electrode 23. Fig. 6 is another cross-sectional view taken along line B-B' of fig. 4. In this embodiment, the first substrate 10 includes the planarization layer 13, a step is disposed in the planarization layer 13 corresponding to the first compensation electrode 21b, that is, a slot facing the planarization layer 13 is disposed in the first pixel defining layer 31b, so as to form the first region 311 with a smaller thickness in the first pixel defining layer 31b, which can reduce the distance between the first compensation electrode 21b and the second electrode 23, effectively increase the capacitance of the first compensation capacitor C1, further increase the OLED capacitance of the first color light emitting device 20a, thereby improving the problem that the first color light emitting device 20a is not dark, and improving the display effect of the organic light emitting display panel.
In addition, the first compensation electrode 21b extends along the sidewall and the bottom surface of the groove facing the planarization layer 13 in the first pixel defining layer 31b, increasing the contact area of the first compensation electrode 21b and the planarization layer 13, which can improve the adhesion of the first compensation electrode 21b and the first substrate 10, thereby enhancing the adhesion of the organic light emitting layer 22 and the first substrate 10.
Alternatively, as shown in any one of fig. 1 to 6, the first region 311 is located at one side of the first opening region 31a on a plane parallel to the organic light emitting display panel. In this embodiment, the first area 311 is disposed on one side of the first opening area 31a, and the thickness of the first pixel defining layer 31b corresponding to the first area 311 is smaller than the thickness of the first pixel defining layer 31b corresponding to the second area 312, so that the distance between the first compensation electrode 21b and the second electrode 23 can be reduced, the capacitance of the first compensation capacitor C1 can be effectively increased, and the OLED capacitance of the first color light emitting device 20a can be increased, thereby improving the problem that the first color light emitting device 20a is not dark in a dark state, and improving the display effect of the organic light emitting display panel.
Optionally, as shown in fig. 7 to 9, on a plane parallel to the organic light emitting display panel, the first region 311 is located on at least two sides of the first opening region 31a, so as to further increase the area of the first region 311, further effectively increase the capacitance of the first compensation capacitor C1, and improve the problem that the first color light emitting device 20a is not dark in a dark state.
Optionally, as shown in fig. 7 to 8, the plurality of first regions 311 are correspondingly disposed in the first opening region 31a, so as to further increase the area of the first regions 311, further effectively increase the capacitance of the first compensation capacitor C1, and improve the problem that the first color light emitting device 20a is not dark in a dark state.
Optionally, for the organic light emitting display panel according to any of the above embodiments, the first thickness d1 is greater than or equal to 100 nm. If the first thickness d1 is too small, the pixel defining layer 30 may not be able to effectively insulate electrically, resulting in a short circuit between the first electrode 21 and the second electrode 23, which may affect the performance of the organic light emitting display panel.
Alternatively, for the organic light emitting display panel according to any of the above embodiments, the shape of the first region 311 is a rectangle, a rounded rectangle, a rhombus, a pentagon, a hexagon, or an octagon. The shape of the optional first region 311 is rectangular in the above embodiment. As will be understood by those skilled in the art, when the first region is disposed in the pixel defining layer of the organic light emitting display panel, the shape of the first region is not limited, and the relevant practitioner may set the shape of the first region appropriately according to the product or process conditions.
Alternatively, for the organic light emitting display panel according to any of the above embodiments, the first compensation electrode 21b also overlaps at least a portion of the second region 312. The first compensation electrode 21b, the second electrode 23, and the interlayer between the first compensation electrode 21b and the second electrode 23 form a first compensation capacitor C1, and the first compensation electrode 21b covers the first region 311 and optionally overlaps at least a portion of the second region 312, so that the overlapping area between the first compensation electrode 21b and the second electrode 23 is increased, and the capacitance of the first compensation capacitor C1 is increased.
Taking the organic light emitting display panel shown in fig. 2 or fig. 3 as an example, the groove of the first pixel defining layer 31b is not directly connected to the first opening area 31a, and the first compensation electrode 21b covers the second area 312 between the first area 311 and the first opening area 31 a. Further alternatively, the first compensation electrode 21b may extend to overlap with at least a part of the second region 312 away from the first opening region 31a, so that the capacitance value of the first compensation capacitor C1 can be increased. Taking the organic light emitting display panel shown in fig. 5 or fig. 6 as an example, the groove of the first pixel defining layer 31b directly contacts the first opening region 31a, so that the first compensation electrode 21b can be extended and overlapped with at least a portion of the second region 312 far away from the first opening region 31a, thereby increasing the capacitance of the first compensation capacitor C1.
Alternatively, the first color light emitting device 20a is a green light emitting device, the second color light emitting device 20b is one of a red light emitting device and a blue light emitting device, and the third color light emitting device 20c is the other of the red light emitting device and the blue light emitting device.
Alternatively, the first color light emitting device 20a has a first capacitance value in the first open area 31a, the second color light emitting device 20b has a second capacitance value in the second open area 32a, and the third color light emitting device 20c has a third capacitance value in the third open area 33a, the first, second, and third capacitance values being respectively derived from capacitors formed by the first electrode 21, the second electrode 23, and the organic light emitting layer 22 between the first electrode 21 and the second electrode 23; wherein the first capacitance value is smaller than the second capacitance value, and/or the first capacitance value is smaller than the third capacitance value.
Alternatively, the area of the first open area 31a is smaller than the area of the second open area 32a, and/or the area of the first open area 31a is smaller than the area of the third open area 33 a.
Optionally, the first region 311 satisfies the following formula: s/d < Δ C/(ε o ∈ r), where S is an area of the first region 311, d is a distance between the first electrode 21 and the second electrode 23 in the first region 311, ε o is a vacuum dielectric constant, and ε r is a dielectric relative dielectric constant; where Δ C is an absolute value of a difference between the first capacitance value and the second capacitance value, or Δ C is an absolute value of a difference between the first capacitance value and the third capacitance value.
The organic light-emitting display panel provided by the embodiment of the invention can optionally comprise a red light-emitting device, a green light-emitting device and a blue light-emitting device, wherein the organic light-emitting layer 22 of the red light-emitting device is made of a red light organic light-emitting material, the organic light-emitting layer 22 of the green light-emitting device is made of a green light organic light-emitting material, and the organic light-emitting layer 22 of the blue light-emitting device is made of a blue light organic light-emitting material. The green organic light-emitting material has the highest luminous efficiency, and the blue organic light-emitting material has the lowest luminous efficiency. The light emitting efficiency is a ratio of luminous flux to power, and when the luminous flux is the same, the larger the power is, the lower the light emitting efficiency is, and the smaller the power is, the higher the light emitting efficiency is, which can be understood as electric energy for providing the light source, the power is related to the areas of the first electrode, the organic light emitting layer and the second electrode, that is, the power is related to the area of the opening region of the light emitting device, the larger the area of the opening region of the light emitting device is, the higher the power is, and the smaller the area of the opening region of the light emitting device is, the lower the power is. Under the condition that the red light emitting device, the green light emitting device and the blue light emitting device are required to have the same light emitting effect (i.e., luminous flux), it is known that luminous flux is the product of luminous efficiency and power, and based on that the luminous efficiency of the green organic light emitting material is the highest and that of the blue organic light emitting material is the lowest, the light emitting area required for the green light emitting device is the smallest (i.e., the opening area is the smallest) and that required for the blue light emitting device is the largest (i.e., the opening area is the largest).
The different opening areas of the light emitting devices 20 with different colors may cause the areas of the first electrodes 21 of the light emitting devices 20 with different colors to be different, thereby causing the OLED capacitances of the light emitting devices 20 with different colors to be different. Especially, the light emitting area of the green light emitting device is the smallest and the light emitting area of the blue light emitting device is the largest, so the OLED capacitance of the green light emitting device in the organic light emitting display panel is much smaller than that of the blue light emitting device. It is known that the smaller the OLED capacitance of the light emitting device 20 is, the faster the drain current of the driving transistor in the pixel circuit 12 causes the anode (i.e., the first electrode 21) to rise in potential, the more serious the dark state of the light emitting device 20 is, and therefore, compared with a blue light emitting device and a red light emitting device, the smaller the OLED capacitance of the green light emitting device is, and compared with the blue light emitting device and the red light emitting device, the more serious the dark state of the green light emitting device is, and compensating the OLED capacitance of the green light emitting device becomes a technical problem to be solved urgently.
In this embodiment, the first compensation capacitor C1 is disposed in the first color light emitting device 20a, so as to increase the OLED capacitance of the first color light emitting device 20a and improve the dark state of the first color light emitting device 20 a. When the first color light emitting device 20a is a green light emitting device, the dark state of the green light emitting device can be improved, because the dark state of the green light emitting device is most prominent, compared with the case that the first color light emitting device is a blue light emitting device or the first color light emitting device is a red light emitting device, when the first color light emitting device is a green light emitting device, a compensation capacitor can be separately arranged on the green light emitting device, which is beneficial to improving the display effect of the green light emitting device with the most prominent dark state problem, the dark state display difference between the green light emitting device and the blue light emitting device is reduced, and the dark state display difference between the green light emitting device and the red light emitting device is reduced, the dark state display uniformity of the organic light emitting display panel is effectively improved, and the display effect of the display panel is improved.
The first capacitance value is the capacitance value of the first display capacitor of the first color light emitting device 20a, the second capacitance value is the capacitance value of the OLED capacitor of the second color light emitting device 20b, and the third capacitance value is the capacitance value of the OLED capacitor of the third color light emitting device 20 c. The area of the first opening region 31a is small, and thus the capacitance value of the first display capacitor of the first color light emitting device 20a is smaller than the capacitance values of the OLED capacitors of the other color light emitting devices 20. By arranging the first compensation capacitor C1 in the first color light emitting device 20a, the OLED capacitance of the first color light emitting device 20a can be increased, the dark state of the first color light emitting device 20a is improved, the difference between the OLED capacitance of the first color light emitting device 20a and the OLED capacitances of other color light emitting devices is reduced, and the dark state display effect of the organic light emitting display panel is improved as a whole.
In this embodiment, only the OLED capacitance of the first color light emitting device 20a is compensated, the first region 311 may be set with a capacitance difference value between the first capacitance of the first color light emitting device 20a and the second capacitance of the second color light emitting device 20b as a reference value to reduce a difference value between the OLED capacitance of the first color light emitting device 20a and the OLED capacitance of the second color light emitting device 20 b; alternatively, the setting of the first region 311 is performed with a difference in capacitance of the first color light emitting device 20a and the third capacitance of the third color light emitting device 20c as a reference value to reduce a difference in OLED capacitance of the first color light emitting device 20a and the OLED capacitance of the third color light emitting device 20 c.
The practitioner of interest determines the range of the ratio of the bottom area to the thickness of the recess of the first region 311 based on the difference between the OLED capacitance of the first color light emitting device 20a and the OLED capacitance of the second color light emitting device 20b, i.e., when the first region 311 is arranged in S/d < ac/(eo ∈ r), the OLED capacitance of the first color light emitting device 20a can be increased and the difference between the OLED capacitance of the first color light emitting device 20a and the OLED capacitance of the second color light emitting device 20b can be decreased. Likewise, the recesses of the first region can also be arranged in accordance with S/d < Δ C/(ε o ∈ r) in other embodiments to reduce the difference between the OLED capacitance of the first color light emitting device and the OLED capacitance of the third color light emitting device.
Alternatively, as shown in fig. 10, the first electrode 21 of the second color light emitting device 20b includes a second display electrode 21C and a second compensation electrode 21d electrically connected to each other, the second display electrode 21C is in contact with the organic light emitting layer 22, and the second electrode 23, the second compensation electrode 21d, and an interlayer between the second electrode 23 and the second compensation electrode 21d constitute a second compensation capacitor C2; and/or the first electrode 21 of the third color light emitting device 20C includes a third display electrode 21e and a third compensation electrode 21f electrically connected to each other, the third display electrode 21C is in contact with the organic light emitting layer 22, and the second electrode 23, the third compensation electrode 21f, and an interlayer between the second electrode 23 and the third compensation electrode 21f constitute a third compensation capacitor C3.
It is known that a driving transistor of a pixel circuit corresponding to a light emitting device of each color has a leakage current, and the leakage current may cause an anode potential of the light emitting device to be raised, so that the light emitting device is stolen to be bright, and a dark state of the light emitting device is not dark. A second compensation capacitor C2 can be optionally added to the second color light emitting device 20b as shown in fig. 10 to increase the OLED capacitance of the second color light emitting device 20b and improve the dark state of the second color light emitting device 20 b; and adding a second compensation capacitor C3 to the third color light emitting device 20C to increase the OLED capacitance of the third color light emitting device 20C to improve the dark state of the third color light emitting device 20C. The dark state display effect of the organic light emitting display panel is improved as a whole.
Optionally, as shown in fig. 11, the second pixel defining layer 32b includes a third region 321 and a fourth region 322, the second pixel defining layer 32b corresponding to the third region 321 has a third thickness d3, the second pixel defining layer 32b corresponding to the fourth region 322 has a fourth thickness d4, the third thickness d3 is smaller than the fourth thickness d4, the third thickness d3 and the fourth thickness d4 are both in a direction perpendicular to the organic light emitting display panel, the second compensation electrode 21d overlaps at least the third region 321, and a distance between the second compensation electrode 21d and the second electrode 23 in the third region 321 is smaller than the fourth thickness d 4; and/or the third pixel defining layer 33b includes a fifth region 331 and a sixth region 332, the third pixel defining layer 33b corresponding to the fifth region 331 has a fifth thickness d5, the third pixel defining layer 33b corresponding to the sixth region 332 has a sixth thickness d6, the fifth thickness d5 is smaller than the sixth thickness d6, the fifth thickness d5 and the sixth thickness d6 are both in a direction perpendicular to the organic light emitting display panel, the third compensation electrode 21f overlaps at least the fifth region 331, and a distance between the third compensation electrode 21f and the second electrode 23 in the fifth region 331 is smaller than the sixth thickness d 6.
The optional second pixel defining layer 32b includes a third region 321 and a fourth region 322, and the third pixel defining layer 33b includes a fifth region 331 and a sixth region 332 as shown in fig. 11. By providing the second pixel defining layer with a smaller thickness in the area of the second pixel defining layer 32b corresponding to the second compensation electrode 21d, the distance between the second compensation electrode 21d and the second electrode 23 can be reduced, the capacitance of the second compensation capacitor C2 can be further increased, and the OLED capacitance of the second color light emitting device 20b can be further increased, thereby improving the problem that the second color light emitting device 20b is not dark in a dark state. And by providing the third pixel defining layer with a smaller thickness in the region of the third pixel defining layer 33b corresponding to the third compensation electrode 21f, the distance between the third compensation electrode 21f and the second electrode 23 can be reduced, the capacitance of the third compensation capacitor C3 can be further increased, and the OLED capacitance of the third color light emitting device 20C can be further increased, thereby improving the problem that the third color light emitting device 20C is not dark in a dark state. Therefore, the display effect of the organic light emitting display panel can be improved.
The advantages of providing a compensation capacitor are illustrated here in a specific example.
As shown in table 1, the light emitting device is provided with the compensation electrode, and the pixel defining layer is not provided with the groove:
| C＝εo*ε*S/d | R | G | B |
| area of opening region (μm)2) | 172.92 | 83.00 | 261.79 |
| Area of first electrode (mum)2) | 402.00 | 340.00 | 505.00 |
| Area of opening area/area of first electrode | 0.43 | 0.24 | 0.52 |
| First electrode area-open area (μm)2) | 229.08 | 257.00 | 243.21 |
| OLED device film thickness (mum) | 0.30 | 0.24 | 0.20 |
| PDL+OLED common(μm) | 1.67 | 1.67 | 1.67 |
| Display capacitance value (F) | 1.70E-14 | 1.03E-14 | 3.86E-14 |
| Compensation capacitance value (F) | 4.01E-15 | 4.50E-15 | 4.26E-15 |
| OLED Total capacitance (F) | 2.10E-14 | 1.48E-14 | 4.29E-14 |
As shown in table 2, the light emitting device is provided with a compensation electrode, and the pixel defining layer is provided with a groove:
at least one of a hole injection layer and a hole transport layer is also typically formed on a side of the first electrode of the light emitting device facing the organic light emitting layer, and at least one of an electron transport layer and an electron injection layer is also typically formed on a side of the second electrode of the light emitting device facing the organic light emitting layer. In the case of fabricating the electron transport layer, the electron injection layer, the hole transport layer, and the hole injection layer of the light emitting device, these film layers may be disposed over the entire surface, and thus these film layers may be simultaneously formed on the surface of the pixel defining layer, and thus the electron transport layer and/or the electron injection layer, and the hole transport layer and/or the hole injection layer may be included between the compensation electrode and the second electrode in addition to the pixel defining layer.
PDL is the pixel defining layer, and OLED common is the electron transport layer, the electron injection layer, the hole transport layer, and the hole injection layer in the OLED device, then PDL + OLED common is the area covered by the pixel defining layer, the spacing between the first electrode and the second electrode. d is the thickness of the pixel definition layer remained after the groove is dug in the pixel definition layer, and d + OLED common is the distance between the first electrode and the second electrode and the corresponding area of the groove of the pixel definition layer. The display capacitor is composed of a first electrode, a second electrode, and an organic light emitting layer between the first electrode and the second electrode, and a display capacitance value is a capacitance value of the display capacitor. The compensation capacitor is composed of a first electrode, a second electrode and a PDL + OLED common between the first electrode and the second electrode, and the compensation capacitance value is the capacitance value of the compensation capacitor.
As shown in table 1, when no recess is provided in the pixel defining layer corresponding to the red light emitting device R and the length of the first electrode is simply increased, the capacitance of the compensation capacitor added to the red light emitting device R is 4.01 × 10-15F. No recess is provided in the pixel definition layer corresponding to the green light emitting device G, and only the length of the first electrode is extended, so that the capacitance value of the compensation capacitor added to the green light emitting device G is 4.50 × 10-15F. No recess is provided in the pixel defining layer corresponding to the blue light emitting device B, and only the length of the first electrode is extended, so that the capacitance value of the compensation capacitor added to the blue light emitting device B is 4.26 × 10-15F. The total capacitance value of the green light emitting device G is about 34% of that of the blue light emitting device B, and the total capacitance value of the green light emitting device G is about 70% of that of the red light emitting device R. The compensation capacitor plays a smaller role.
As shown in Table 2, a groove was provided only in the pixel defining layer corresponding to the green light emitting device G, the pitch of the first electrode and the second electrode in the groove region was 0.67. mu.m, and the bottom area of the groove was 100. mu.m2The capacitance of the compensation capacitor added to the green light emitting device G is 7.11 × 10-15F. No recess is provided in the pixel defining layer corresponding to the red light emitting device R, and only the length of the first electrode is extended, so that the capacitance value of the compensation capacitor added to the red light emitting device R is 4.01 × 10-15F. No recess is provided in the pixel defining layer corresponding to the blue light emitting device B, and only the length of the first electrode is extended, so that the capacitance value of the compensation capacitor added to the blue light emitting device B is 4.26 × 10-15F. The total capacitance of the green light emitting device G is increased to 40% of that of the blue light emitting device B, and the total capacitance of the green light emitting device G is about 82% of that of the red light emitting device R.
The green light emitting device G shown in table 1 and table 2 is compared, only the compensation electrode is arranged without the groove, the added compensation capacitance value is smaller, the capacitance difference between different color light emitting devices cannot be reduced better, the size of the compensation capacitance can be effectively improved after the groove is arranged, and the capacitance difference between different color light emitting devices is reduced. On the other hand, any two adjacent light-emitting devices are insulated at intervals by adopting the pixel definition layer, the space where the compensation electrode can extend is limited, and the size of the compensation capacitor can be effectively improved in the limited area of the compensation electrode by arranging the groove.
The effect of the different spacings of the groove bottom and the compensation electrode on the capacitance value of the compensation capacitor is also shown. Take green light emitting device as an example, wherein the bottom area S of the groove of the pixel defining layer part corresponding to the compensation electrode of the green light emitting device is 100 μm2The pixel definition layer was kept at different thicknesses, and the OLED capacitance of the green light emitting device was calculated as shown in table 3:
as shown in the above table, the smaller d is better in view of the increased capacitance, but in practical production, the proper distance between the groove bottom and the compensation electrode is selected in consideration of the insulation property of the first electrode and the second electrode. Of course, in other embodiments, the OLED capacitance of the green light emitting device can be increased by increasing S, which is not described herein again.
An embodiment of the present invention further provides an electronic device, which includes the organic light emitting display panel according to any of the above embodiments. The electronic equipment can be selected from a smart phone, a tablet computer and the like.
In the organic light emitting display panel provided by the embodiment of the invention, the thickness of the first region of the first pixel defining layer is smaller, so that the capacitance value of the first compensation capacitor can be improved. Optionally, a half-tone mask process is adopted to process the first pixel defining layer to form a first region with a relatively thin thickness, so that the OLED capacitance of the first color light emitting device is increased, and the problem that the first color light emitting device is not dark in a dark state is solved.
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 modifications, rearrangements, combinations 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 (16)
1. An organic light emitting display panel, comprising:
a first substrate;
the light-emitting devices comprise first electrodes, organic light-emitting layers and second electrodes, the organic light-emitting layers are located between the first electrodes and the second electrodes, the first electrodes of any two adjacent light-emitting devices are arranged in an insulating mode, and the first electrodes and the second electrodes are arranged in an insulating mode;
the plurality of light emitting devices include at least a first color light emitting device, a second color light emitting device, and a third color light emitting device, wherein a first electrode of the first color light emitting device includes a first display electrode and a first compensation electrode electrically connected to each other, the first display electrode being in contact with the organic light emitting layer;
a pixel defining layer on the first substrate, the pixel defining layer including a first pixel defining layer defining a first open area, a second pixel defining layer defining a second open area, and a third pixel defining layer defining a third open area, the first color light emitting device being located in the first open area, the second color light emitting device being located in the second open area, and the third color light emitting device being located in the third open area, wherein the first pixel defining layer includes a first region and a second region, the first pixel defining layer corresponding to the first region has a first thickness, the first pixel defining layer corresponding to the second region has a second thickness, the first thickness is smaller than the second thickness, and the first thickness and the second thickness are both dimensions in a direction perpendicular to the organic light emitting display panel, the first open area corresponds to at least one of the first regions; the first compensation electrode overlaps at least the first region;
at least one first compensation capacitor formed by the second electrode, the first compensation electrode, and an interlayer between the second electrode and the first compensation electrode;
in the first region, a distance between the first compensation electrode and the second electrode is less than the second thickness;
the second region is provided between the first region and the first opening region in a direction parallel to the organic light emitting display panel, the first region including a groove having a bottom surface and a sidewall, the bottom surface and the sidewall being formed by the first pixel defining layer;
alternatively, the first region is contiguous with the first open region, the first region including a trench having a bottom surface and a sidewall, the bottom surface and the sidewall being formed by the first pixel defining layer.
2. The organic light-emitting display panel according to claim 1, wherein a bottom surface of the groove or a bottom surface of the groove is located on a side of the first pixel defining layer adjacent to the second electrode.
3. The organic light-emitting display panel according to claim 1, wherein a bottom surface of the groove or a bottom surface of the groove is located on a side of the first pixel defining layer away from the second electrode.
4. The organic light-emitting display panel according to claim 1, wherein the first region is located on one side of the first opening region in a plane parallel to the organic light-emitting display panel.
5. The organic light-emitting display panel according to claim 1, wherein the first region is located on at least two sides of the first opening region on a plane parallel to the organic light-emitting display panel.
6. The organic light-emitting display panel according to claim 1, 4 or 5, wherein a plurality of the first regions are provided corresponding to the first opening regions.
7. The organic light-emitting display panel of claim 1, wherein the first thickness is greater than or equal to 100 nanometers.
8. The organic light-emitting display panel according to claim 1, wherein the first region has a shape of a rectangle, a rounded rectangle, a rhombus, a pentagon, a hexagon, or an octagon.
9. The organic light-emitting display panel according to claim 1, wherein the first compensation electrode further overlaps at least a part of the second region.
10. The organic light-emitting display panel according to claim 1, wherein the first color light-emitting device is a green light-emitting device, the second color light-emitting device is one of a red light-emitting device and a blue light-emitting device, and the third color light-emitting device is the other of the red light-emitting device and the blue light-emitting device.
11. The organic light emitting display panel according to claim 1, wherein a first color light emitting device has a first capacitance value in a first open area, a second color light emitting device has a second capacitance value in a second open area, and a third color light emitting device has a third capacitance value in a third open area, the first, second, and third capacitance values being respectively obtained by a capacitor formed by the first electrode, the second electrode, and the organic light emitting layer between the first electrode and the second electrode;
wherein the first capacitance value is smaller than the second capacitance value, and/or the first capacitance value is smaller than the third capacitance value.
12. The organic light-emitting display panel according to claim 11, wherein an area of the first open region is smaller than an area of the second open region, and/or an area of the first open region is smaller than an area of the third open region.
13. The organic light-emitting display panel according to claim 11, wherein the first region satisfies the following formula:
S/d<ΔC/(εo*εr)，
wherein S is the area of the first region, d is the distance between the first electrode and the second electrode in the first region, ε o is the vacuum dielectric constant, and ε r is the dielectric relative dielectric constant; wherein the content of the first and second substances,
Δ C is an absolute value of a difference between the first capacitance value and the second capacitance value, or Δ C is an absolute value of a difference between the first capacitance value and the third capacitance value.
14. The organic light-emitting display panel according to claim 11, wherein the first electrode of the second color light-emitting device comprises a second display electrode and a second compensation electrode electrically connected to each other, the second display electrode is in contact with the organic light-emitting layer, and the second electrode, the second compensation electrode, and an interlayer between the second electrode and the second compensation electrode constitute a second compensation capacitor; and/or the presence of a gas in the gas,
the first electrode of the third color light emitting device includes a third display electrode and a third compensation electrode electrically connected to each other, the third display electrode is in contact with the organic light emitting layer, and the second electrode, the third compensation electrode, and an interlayer between the second electrode and the third compensation electrode constitute a third compensation capacitor.
15. The organic light-emitting display panel according to claim 14,
the second pixel defining layer comprises a third area and a fourth area, the second pixel defining layer corresponding to the third area has a third thickness, the second pixel defining layer corresponding to the fourth area has a fourth thickness, the third thickness is smaller than the fourth thickness, the third thickness and the fourth thickness are both along the direction vertical to the organic light-emitting display panel, the second compensation electrode at least overlaps with the third area, and in the third area, the distance between the second compensation electrode and the second electrode is smaller than the fourth thickness; and/or the presence of a gas in the gas,
the third pixel defining layer comprises a fifth area and a sixth area, the third pixel defining layer corresponding to the fifth area has a fifth thickness, the third pixel defining layer corresponding to the sixth area has a sixth thickness, the fifth thickness is smaller than the sixth thickness, the fifth thickness and the sixth thickness are both along the direction perpendicular to the organic light-emitting display panel, the third compensation electrode at least overlaps with the fifth area, and in the fifth area, the distance between the third compensation electrode and the second electrode is smaller than the sixth thickness.
16. An electronic device characterized by comprising the organic light-emitting display panel according to any one of claims 1 to 15.
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