CN110071163B

CN110071163B - Organic light emitting display panel

Info

Publication number: CN110071163B
Application number: CN201910372309.6A
Authority: CN
Inventors: 范英春
Original assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2019-05-06
Filing date: 2019-05-06
Publication date: 2021-07-06
Anticipated expiration: 2039-05-06
Also published as: CN110071163A; WO2020224033A1

Abstract

An organic light emitting display panel comprising: the light-emitting device comprises a substrate, a driving transistor and a capacitor element which are formed on the substrate, and a light-emitting element which is formed on the driving transistor and above the capacitor element. The capacitor elements are arranged in the light emitting areas of the light emitting elements at intervals, and the first electrode and the second electrode of each capacitor element are respectively electrically connected with the first end and the control end of the driving transistor, so that the plurality of capacitor elements are connected in parallel.

Description

Organic light emitting display panel

Technical Field

The invention relates to the technical field of display, in particular to an organic light-emitting display panel.

Background

Fig. 1 is a partial cross-sectional view of a conventional Organic Light Emitting Display panel (Organic Light Emitting Display panel). For each pixel of the organic light emitting display panel 1, a storage capacitor Cst is provided to maintain the gate potential of the driving transistor. In general, the storage capacitor Cst must have a capacitance value large enough to ensure a required output current, and thus its layout area may have an influence on an aperture ratio (aperture ratio) of the organic light emitting display panel 1. Furthermore, in the conventional process, the pixel defining layer 10 usually generates the margin area MA outside the layout area of the storage capacitor Cst, which further reduces the aperture ratio of the organic light emitting display panel 1.

Therefore, it is necessary to provide an organic light emitting display panel to solve the above problems.

Disclosure of Invention

The present invention is directed to an organic light emitting display panel, which can effectively increase the aperture ratio of an organic light emitting display.

In order to achieve the above object, the present invention provides an organic light emitting display panel, comprising: a substrate; a driving transistor and a plurality of capacitive elements formed on the substrate; and a light emitting element formed on the driving transistor and above the plurality of capacitance elements; the plurality of capacitance elements are arranged in the light emitting area of the light emitting element at intervals, and the first electrode and the second electrode of each capacitance element are respectively electrically connected with the first end and the control end of the driving transistor, so that the plurality of capacitance elements are connected in parallel.

In some embodiments, the light emitting element includes an anode layer electrically connected to the first end of the driving transistor, a cathode layer, and an organic light emitting layer disposed between the anode layer and the cathode layer.

In some embodiments, the organic light emitting display panel further includes: a pixel defining layer formed on the anode layer, wherein the pixel defining layer has an opening corresponding to the light emitting region.

In some embodiments, the first terminal of the driving transistor and the first electrode of each of the plurality of capacitive elements are integrally formed on the substrate.

In some embodiments, the control terminal of the driving transistor and the second electrode of each of the plurality of capacitive elements are integrally formed on the substrate.

In some embodiments, the material of the first electrode of each of the plurality of capacitive elements is selected from one of aluminum, molybdenum, copper, indium tin oxide, silver, or a metal alloy.

In some embodiments, the material of the second electrode of each of the plurality of capacitive elements is selected from one of aluminum, molybdenum, copper, indium tin oxide, silver, or a metal alloy.

In some embodiments, the control terminal of the driving transistor is a gate.

In some embodiments, the first terminal of the driving transistor is a drain.

In some embodiments, the second terminal of the driving transistor is electrically connected to a voltage source.

In order to make the features and technical contents of the present invention comprehensible, please refer to the following detailed description of the present invention and the accompanying drawings, which are provided for reference and not for limiting the present invention.

Drawings

Fig. 1 is a partial cross-sectional view of a conventional organic light emitting display panel;

fig. 2 is a partial cross-sectional view of an organic light emitting display panel according to an embodiment of the present invention;

fig. 3 is an equivalent circuit diagram of the organic light emitting display panel of fig. 2.

Detailed Description

In order to make the objects, technical means and effects of the present invention more clear and definite, the present invention will be further explained with reference to the accompanying drawings. It is to be understood that the embodiments described herein are only a few embodiments of the present invention, not all embodiments, and are not intended to limit the present invention.

Referring to fig. 2, a partial cross-sectional view of an organic light emitting display panel according to an embodiment of the present invention is shown. The organic light emitting display panel 2 of the present invention includes: the liquid crystal display device comprises a substrate 20, a driving transistor T1 and a plurality of capacitance elements C1 which are formed on the substrate 20, and a light emitting element D1 which is formed on the driving transistor T1 and above the plurality of capacitance elements C1. In this embodiment, the plurality of capacitor elements C1 are disposed at intervals in the light emitting area AA of the light emitting element D1. Since the minute capacitive element C1 occupies a small space, it is not easily visible to the human eye. Further, the first electrode 21 and the second electrode 22 of each of the plurality of capacitive elements C1 are electrically connected to the first terminal 23 and the control terminal 24 of the driving transistor T1, respectively, so that the plurality of capacitive elements C1 are connected in parallel. The plurality of capacitive elements C1 connected in parallel can be regarded as one capacitive element having a large capacitance value.

As shown in fig. 2, light-emitting element D1 includes anode layer 27, cathode layer 28, and organic light-emitting layer 29 disposed between anode layer 27 and cathode layer 28. The anode layer 27 is electrically connected to the first terminal 23 of the driving transistor T1. In the present embodiment, the organic light emitting display panel 2 further includes a pixel defining layer 26 formed on the anode layer 27. The pixel defining layer 26 has an opening 260 corresponding to the light emitting region AA.

Specifically, the control terminal 24 of the driving transistor T1 is a gate, the first terminal 23 of the driving transistor T1 is a drain, and the second terminal 25 of the driving transistor T1 is a source. In some embodiments, the first terminal 23 of the driving transistor T1 and the first electrode 21 of each of the plurality of capacitive elements C1 are integrally formed on the substrate 20. Specifically, the material of the first electrode 21 is selected from one of aluminum, molybdenum, copper, indium tin oxide, silver, or a metal alloy. In addition, the control terminal 24 of the driving transistor T1 and the second electrode 22 of each of the plurality of capacitive elements C1 are also integrally formed on the substrate 20. Specifically, the material of the second electrode 22 is selected from one of aluminum, molybdenum, copper, indium tin oxide, silver, or a metal alloy. In other embodiments, the first electrode 21 of the capacitor C1 may be electrically connected to the first terminal 23 of the driving transistor T1 through some wiring layers, and the second electrode 22 of the capacitor C1 may also be electrically connected to the control terminal 24 of the driving transistor T1 through some wiring layers.

Fig. 3 is an equivalent circuit diagram of the organic light emitting display panel of fig. 2. As shown in fig. 3, the plurality of capacitive elements C1 are connected in parallel. By connecting a plurality of capacitor elements C1 in parallel, a storage capacitor having a large capacitance is formed between the first terminal 23 and the control terminal 24 of the driving transistor T1. In addition, the second terminal 25 of the driving transistor T1 is electrically connected to the voltage source VDD, the anode layer 27 of the light emitting element D1 is electrically connected to the first terminal 23 of the driving transistor T1, and the cathode layer 28 of the light emitting element D1 is grounded.

In summary, the organic light emitting display panel provided by the present invention utilizes the plurality of capacitor elements C1 connected in parallel to replace the storage capacitor Cst of the conventional organic light emitting display panel, such that the light emitting area AA and the capacitor element C1 are automatically aligned with each other without forming the margin area MA of the conventional organic light emitting display panel, thereby increasing the aperture ratio of the organic light emitting display.

It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.

Claims

1. An organic light emitting display panel, comprising:

a substrate;

a driving transistor and a plurality of capacitive elements formed on the substrate; and

a light emitting element formed on the driving transistor and above the plurality of capacitor elements;

the plurality of capacitance elements are arranged in the light emitting area of the light emitting element at intervals, and the first electrode and the second electrode of each capacitance element are respectively electrically connected with the first end and the control end of the driving transistor, so that the plurality of capacitance elements are connected in parallel;

wherein the first terminal of the driving transistor and a first electrode of each of the plurality of capacitive elements are integrally formed on the substrate; and

wherein the control terminal of the driving transistor and the second electrode of each of the plurality of capacitive elements are integrally formed on the substrate.

2. The organic light-emitting display panel according to claim 1, wherein the light-emitting element includes an anode layer, a cathode layer, and an organic light-emitting layer provided between the anode layer and the cathode layer, the anode layer being electrically connected to the first end of the driving transistor.

3. The organic light emitting display panel of claim 2, further comprising: a pixel defining layer formed on the anode layer, wherein the pixel defining layer has an opening corresponding to the light emitting region.

4. The organic light-emitting display panel according to claim 1, wherein a material of the first electrode of each of the plurality of capacitor elements is selected from one of aluminum, molybdenum, copper, indium tin oxide, silver, or a metal alloy.

5. The organic light-emitting display panel according to claim 1, wherein a material of the second electrode of each of the plurality of capacitor elements is selected from one of aluminum, molybdenum, copper, indium tin oxide, silver, or a metal alloy.

6. The organic light emitting display panel of claim 1, wherein the control terminal of the driving transistor is a gate electrode.

7. The organic light emitting display panel of claim 6, wherein the first terminal of the driving transistor is a drain electrode.

8. The organic light emitting display panel of claim 7, wherein the second terminal of the driving transistor is electrically connected to a voltage source.