阅读说明：本技术 有机发光显示面板及其显示装置 (Organic light emitting display panel and display device thereof ) 是由 徐鸣 于 2019-08-05 设计创作，主要内容包括：本揭示提供一种有机发光显示面板,包括：背板,所述背板包括至少一个薄膜晶体管；一个白色有机发光二极体器件和所述薄膜晶体管电连接,所述白色有机发光二极体器件包括第一电极、至少一有机发光层、第二电极和像素限定层,所述像素限定层位于所述白色有机发光二极体器件侧边；其中,所述像素限定层包括有机荧光掺杂材料。(The present disclosure provides an organic light emitting display panel including: a backplane comprising at least one thin film transistor; a white organic light emitting diode device electrically connected to the thin film transistor, the white organic light emitting diode device including a first electrode, at least one organic light emitting layer, a second electrode and a pixel defining layer, the pixel defining layer being located at a side of the white organic light emitting diode device; wherein the pixel defining layer includes an organic fluorescent doping material.)

1. An organic light emitting display panel, comprising:

a backplane comprising at least one thin film transistor;

a white organic light emitting diode device electrically connected to the thin film transistor, the white organic light emitting diode device including a first electrode, at least one organic light emitting layer, a second electrode and a pixel defining layer, the pixel defining layer being located at a side of the white organic light emitting diode device;

wherein the pixel defining layer includes an organic fluorescent doping material.

2. The organic light-emitting display panel according to claim 1, wherein the organic fluorescent doping material has a proportion of less than or equal to 5 percent in the pixel defining layer material.

3. The organic light-emitting display panel according to claim 2, wherein the organic fluorescent doping material is a red light doping material comprising pyrans or diphenyl pentacenes.

4. The organic light-emitting display panel of claim 1, wherein the organic light-emitting layer further comprises at least one blue light-emitting layer and at least one yellow light-emitting layer.

5. The panel of claim 4, wherein the organic light emitting layer is a three-layer structure formed by stacking the blue light emitting layer, the yellow light emitting layer and the blue light emitting layer.

6. The display panel of claim 1, further comprising a color filter disposed over the white OLED device.

7. The OLED panel of claim 6, wherein the color filter comprises a red photoresist layer, a green photoresist layer or a blue photoresist layer, and a black matrix, wherein the black matrix is disposed outside the red photoresist layer, the green photoresist layer, and the blue photoresist layer, and the red photoresist layer, the green photoresist layer, and the blue photoresist layer have sub-pixels, and the sub-pixels are red sub-pixels, green sub-pixels, or blue sub-pixels.

8. The OLED panel of claim 7, wherein the color filter further comprises colorless sub-pixels, the colorless sub-pixel forms a pixel with the red sub-pixel, the green sub-pixel, and the blue sub-pixel, and each of the sub-pixels corresponds to one of the white OLED devices.

9. The organic light-emitting display panel of claim 6, wherein the red light-doped material comprises 4- (dicyanovinyl) -2-tert-butyl-6- (1,1,7, 7-tetramethyljulonil-4-vinyl) -4H-pyran or 6, 13-diphenylpentacene.

10. An organic light-emitting display device comprising the organic light-emitting display panel according to any one of claims 1 to 9.

Technical Field

The present invention relates to the field of display technologies, and in particular, to an organic light emitting display panel and a display device thereof.

Background

An Active-matrix organic light-emitting diode (AMOLED) display is a popular product in the panel market due to its unique advantages, in which a light-emitting element of a display panel has a White organic light-emitting diode (WOLED) device. The WOLED device adopts a structure of a laminated structure, and the laminated structure comprises two layers, three layers or a plurality of layers of blue light emitting layers and yellow light emitting layers to emit light so as to realize white light. The white light passes through the red, green or blue filter film on the outer layer to realize the light emission of the red sub-pixel, the green sub-pixel or the blue sub-pixel. The WOLED formed by the blue light emitting layer and the yellow light emitting layer is applied to a display panel, the electrical performance of the display panel meets the product requirement, and a larger space is still available for improvement. For example, the opening of the WOLED device corresponding to the red sub-pixel needs to be larger, so that the red light emitting intensity of the WOLED device needs to be enhanced; in addition, the light emitting layers of the colors forming the WOLED device are stacked layer by layer, and the anode and the cathode of the WOLED device are respectively positioned at the two outermost sides of the stacked light emitting layers. When voltage is applied to the electrodes on the two sides, the light emitting layers emit photons, the WOLED device emits light from one surface of the anode or the cathode as a whole, the photons excited by the individual light emitting layers are emitted in all directions, and side light perpendicular to the light emitting surface of the anode or the cathode is not effectively utilized.

Therefore, how to enhance the red light emission intensity of the WOLED device and effectively utilize the side light of the light emitting layer is a problem in the prior art.

Disclosure of Invention

To solve the problems of the prior art, how to enhance the red light emitting intensity of a White organic light-emitting diode (WOLED) device and effectively utilize the side light of a light-emitting layer. The present invention provides an organic light emitting display panel, including: a backplane comprising at least one thin film transistor; a white organic light emitting diode device electrically connected to the thin film transistor, the white organic light emitting diode device including a first electrode, at least one organic light emitting layer, a second electrode and a pixel defining layer, the pixel defining layer being located at a side of the white organic light emitting diode device; wherein the pixel defining layer includes an organic fluorescent doping material.

In one embodiment of the present invention, the proportion of the organic fluorescent doping material in the pixel defining layer material is less than or equal to 5 percent.

In one embodiment of the present invention, the organic fluorescent doping material is a red light doping material, and includes pyrans or diphenyl pentacenes.

In one embodiment of the present invention, the organic light emitting layer further includes at least one blue light emitting layer and at least one yellow light emitting layer.

In one embodiment of the present invention, the organic light emitting layer is a three-layer structure formed by stacking the blue light emitting layer, the yellow light emitting layer and the blue light emitting layer.

In one embodiment of the present invention, the organic light emitting diode further includes a color filter disposed above the white organic light emitting diode.

In one embodiment of the present invention, the color filter includes a red photoresist layer, a green photoresist layer or a blue photoresist layer, and a black matrix, wherein the black matrix is disposed outside the red photoresist layer, the green photoresist layer, and the blue photoresist layer, and the red photoresist layer, the green photoresist layer, and the blue photoresist layer have sub-pixels, and the sub-pixels are red sub-pixels, green sub-pixels, or blue sub-pixels.

In an embodiment of the invention, the color filter further includes a colorless sub-pixel, and the colorless sub-pixel, the red sub-pixel, the green sub-pixel, and the blue sub-pixel form a pixel, and each of the sub-pixels corresponds to one of the white organic light emitting diode devices.

In one embodiment of the present invention, the red light doping material includes 4- (dicyanovinyl) -2-tert-butyl-6- (1,1,7,7-tetramethyl pyrrollidinyl-4-vinyl) -4H-pyran or 6,13-diphenyl pentacene.

The present invention further provides an organic light emitting display device including the organic light emitting display panel described in any one of the above.

The invention aims at the problems that the opening of the WOLED device corresponding to the red sub-pixel needs to be larger and the red light emitting intensity of the WOLED device needs to be enhanced. And, the problem that the side light of the WOLED device is not effectively utilized, a solution is proposed. By doping a small amount of red-light phosphor or red-light doping material in the pixel limiting layer, when power is supplied to the WOLED device, the light emitted by the yellow-light emitting layer in the WOLED device contains red light, and the red-light doping material included in the pixel limiting layer in the WOLED device can absorb the blue light or the green light emitted by the side edge of the stacked organic light emitting layer to carry out photoluminescence, so that the light emitting efficiency of the WOLED device is effectively improved, meanwhile, the light emitting intensity of the red sub-pixel is improved, and the whole color gamut of the organic light emitting display panel is increased.

Drawings

In order to more clearly illustrate the embodiments or technical solutions in the present disclosure, the drawings needed to be used in the description of the embodiments or the present disclosure will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic cross-sectional view illustrating an organic light emitting display panel according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an organic light emitting display device according to an embodiment of the present invention.

Detailed Description

The following description of the various embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments that can be implemented by the application. Directional phrases used in this application, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], etc., refer only to the directions of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and understanding, and is in no way limiting. In the drawings, elements having similar structures are denoted by the same reference numerals.

In order to enhance the red light emitting intensity of a White organic light-emitting diode (WOLED) device and effectively utilize the side light of a light-emitting layer, the invention provides an organic light-emitting display panel. It should be noted that the organic light emitting display panel has a plurality of white organic light-emitting diode (WOLED) devices, and for convenience of understanding and illustration, only one WOLED device and its corresponding related components are shown in fig. 1. Those skilled in the art will appreciate that the organic light emitting display panel actually has a plurality of repeated structures as shown in fig. 1.

Referring to fig. 1, fig. 1 is a schematic cross-sectional structure diagram of an organic light emitting display panel 100 according to an embodiment of the invention. The organic light emitting display panel 100 includes: a backplane 10, said backplane 10 comprising at least one thin film transistor 11. At least one White organic light-emitting diode (WOLED) device is located above the thin film transistor 11. The WOLED device includes a first electrode 61, at least one organic light emitting layer 62, a second electrode 63, and a pixel defining layer 50. The pixel defining layer includes a red light doping material. The first electrode is electrically connected with the thin film transistor so that the white organic light emitting diode can be driven by the thin film transistor.

The pixel defining layer 50 is located at the side of the WOLED device, that is, at the boundary of the first electrode 61, the organic light emitting layer 62 and the second electrode 63. The pixel defining layer 50 is positioned at both sides of the stack of the first electrode 61, the organic light emitting layer 62 and the second electrode 63 in a cross-sectional view, and has a groove shape. In a top view, the pixel defining layer 50 forms an opening, and a stacked layer of the first electrode 61, the organic light emitting layer 62 and the second electrode 63 is disposed in the opening.

The proportion of the red light doping material in the pixel limiting layer 50 material is less than or equal to 5 percent, that is, the organic fluorescent doping material with the concentration not higher than 5 percent and being soluble in the photoresist material is doped in the material for manufacturing the pixel limiting layer 50, the organic fluorescent doping material comprises pyrane or diphenyl pentacene, for example 4- (dicyanovinyl) -2-tert-butyl-6- (1,1,7, 7-tetramethyljulidinyl-4-vinyl) -4H-pyran (4- (Dicyanomethylene) -2-tert-butyl-6- (1,1,7, 7-tetramethyljunolidin-4-yl-vinyl) -4H-pyran, DCJTB) or 6,13-diphenylpentacene (6,13-diphenylpentacene, DPP).

The organic light emitting layer 62 includes a blue light emitting layer and a yellow light emitting layer, or a three-layer structure formed by stacking a blue light emitting layer, a yellow light emitting layer and a blue light emitting layer, and different lamination designs can be made according to product requirements, which is not limited by the invention.

Because the red light doping material obtains energy through blue light or green light irradiation and can be excited to emit fluorescence, the blue light emitting layer in the WOLED device has strong blue light, and the yellow light emitting layer has partial yellow light containing green light, and the light can realize photoluminescence of the red light doping material. Therefore, when the side light of the light-emitting layer irradiates the pixel limiting layer, the red light doping material doped in the pixel limiting layer can absorb the blue light or the green light of the pixel limiting layer, the red light emission is realized, and the side light of the light-emitting layer is effectively utilized.

In the embodiment of the invention, a color filter film is further arranged above the WOLED device. The color filter film includes a red photoresist layer, a green photoresist layer or a blue photoresist layer, and a black matrix 81. Wherein the black matrix 81 is located outside the red photoresist layer, the green photoresist layer, and the blue photoresist layer. The red photoresist layer, the green photoresist layer, or the blue photoresist layer forms the sub-pixel 80. The sub-pixel 80 can be a red sub-pixel, a green sub-pixel, or a blue sub-pixel.

In another embodiment of the present invention, the first electrode 61 is a cathode layer and the second electrode 63 is an anode layer.

In another embodiment of the present invention, the first electrode 61 is a total reflection electrode, and the second electrode 63 is a light-transmissive electrode.

In another embodiment of the present invention, the color filter further includes colorless sub-pixels, that is, the sub-pixels 80 are transparent.

In another embodiment of the present invention, the colorless sub-pixel and the red, green, and blue sub-pixels form a pixel. And, each said sub-pixel corresponds to one said WOLED device.

In the embodiment of the invention, a cover plate 90 is further included and is disposed above the color filter film. And, a protective layer 70 is further included between the color filter film and the WOLED device to prevent moisture or oxygen from entering the WOLED device. The protective layer 70 is, for example, a passivation layer, a planarization layer, or an encapsulation layer. The packaging layer is, for example, a thin film packaging layer, and the material of the thin film packaging layer may be silicon oxide and/or silicon nitride, or a resin film, or a structure formed by alternately using an organic film and an inorganic film.

Optionally, in another embodiment of the present invention, the WOLED device may further include a hole injection layer and a hole transport layer, and an electron injection layer and an electron transport layer between the first electrode 61 and the second electrode 63. Further, the present invention provides another embodiment. Referring to fig. 2, fig. 2 is a schematic structural diagram of an organic light emitting display device according to an embodiment of the present invention, in which the organic light emitting display device 700 includes the organic light emitting display panel 100, and a driving module 300 electrically connected to the organic light emitting display panel 100 for controlling an image frame of the organic light emitting display panel 100.

In summary, although the present application has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present application, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, so that the scope of the present application shall be determined by the appended claims.