CN110429200B - Organic light-emitting display panel, preparation method thereof and organic light-emitting display device - Google Patents
Organic light-emitting display panel, preparation method thereof and organic light-emitting display device Download PDFInfo
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- CN110429200B CN110429200B CN201910578499.7A CN201910578499A CN110429200B CN 110429200 B CN110429200 B CN 110429200B CN 201910578499 A CN201910578499 A CN 201910578499A CN 110429200 B CN110429200 B CN 110429200B
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Abstract
The invention discloses an organic light-emitting display panel, a preparation method thereof and an organic light-emitting display device, wherein the organic light-emitting display panel comprises: a substrate; a first electrode layer including a plurality of first electrodes on one side of the substrate; a pixel defining layer including a plurality of openings exposing the first electrodes; a light emitting layer; the second electrode layer is positioned on one side, far away from the substrate, of the light-emitting layer and the pixel defining layer; at least in a partial region covering the opening, the surface of one side, away from the substrate, of the second electrode layer is provided with a concave structure, and the surface of the concave structure comprises an arc surface; the cathode layer can be in a concave lens shape, so that light with different wavelengths emitted by the light emitting layer can be dispersed into multiple beams of light emitted in different directions after being dispersed by the concave lens formed by the second electrode layer, the wavelength range which can be received by human eyes under a non-normal viewing angle is close to the wavelength range which can be received under a normal viewing angle, and the color cast phenomenon is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to an organic light-emitting display panel, a preparation method thereof and an organic light-emitting display device.
Background
The organic light emitting display panel has the advantages of high response speed, high color purity, wide viewing angle, good foldability, low energy consumption and the like, and is widely applied to the fields of small-size and large-size display.
However, the conventional organic light emitting display device has a problem of color shift when viewed from a non-normal viewing angle.
Disclosure of Invention
The invention provides an organic light-emitting display panel, a preparation method thereof and an organic light-emitting display device, which are used for solving the problem of color cast of the organic light-emitting display panel under a non-normal viewing angle and improving the display effect.
In a first aspect, an embodiment of the present invention provides an organic light emitting display panel, including:
a substrate;
a first electrode layer including a plurality of first electrodes on one side of the substrate;
a pixel defining layer on a side of the substrate on which the first electrode is disposed, the pixel defining layer including a plurality of openings exposing the first electrode;
the light-emitting layer is positioned on one side of the first electrode, which is far away from the substrate;
the second electrode layer is positioned on one side, far away from the substrate, of the light-emitting layer and the pixel defining layer; at least in a partial region covering the opening, the surface of the second electrode layer, which is far away from the substrate, is provided with a concave structure, and the surface of the concave structure comprises an arc surface; and then make the second electrode layer of the partial region of at least covering the opening be the concave lens shape, make the light of different wavelength that the luminescent layer sent disperse the back through the concave lens that the second electrode layer formed, all can disperse to the multiple beam light of following different direction outgoing, and then make under the non-normal viewing angle, people's eye can receive the light of each wavelength, and then make the wavelength range that people's eye can receive under the non-normal viewing angle and the wavelength range that can receive under the normal viewing angle be close, and then improve the colour cast phenomenon.
Optionally, the light-emitting layer at least comprises a red light-emitting layer, a green light-emitting layer and a blue light-emitting layer, and at the transition position of the pixel defining layer and each light-emitting layer, the surface of one side of the second electrode layer, which is far away from the substrate, is provided with a concave structure with an arc surface; the light emitted by each light emitting layer can be diffused to each angle which is not perpendicular to the display panel, so that the wavelength ranges of each color light received by human eyes under each visual angle are relatively close, and the color cast phenomenon is improved. Moreover, the surface of the second electrode layer in the other area of the opening covered by the second electrode layer is still a plane, so that the thickness of the microcavity formed by the first electrode layer (total reflection film) and the second electrode layer (semi-reflection film) is mostly kept consistent, and further, on the basis of improving the color shift, the microcavity effect can be effectively utilized to improve the color purity of the display.
Optionally, the light-emitting layer at least comprises a red light-emitting layer, a green light-emitting layer and a blue light-emitting layer, and at the transition position of the pixel defining layer and the red light-emitting layer, the surface of one side of the second electrode layer, which is far away from the substrate, is provided with a concave structure with an arc surface; and then make the red light that the red luminescent layer sends disperse through the concave lens of the second electrode layer, can have less included angle direction to penetrate along with the display panel goes out the plain noodles, and then increase and have less included angle direction red light's the light quantity of going out with the display panel goes out the plain noodles, and blue luminescent layer and green luminescent layer top second electrode layer do not have concave lens structure, make the display panel go out the plain noodles have less included angle direction blue light and green light's the light quantity of going out of the relative ruddiness light quantity, and then compensate red light along with the part of the many attenuations of visual angle increase luminance relative to green glow and blue light, and then improve the white picture under the positive visual angle and appear the phenomenon of colour cast under the non-positive visual angle.
Optionally, the light-emitting layer at least comprises a red light-emitting layer, a green light-emitting layer and a blue light-emitting layer, and at the transition position between the pixel defining layer and the red light-emitting layer and the transition position between the pixel defining layer and the green light-emitting layer, the surface of the second electrode layer on the side far away from the substrate has a concave structure with an arc surface; and then make the ruddiness that the red luminescent layer sent out and the green glow that the green luminescent layer sent out pass through the divergence of the concave lens of second electrode layer, can follow and go out with the play plain noodles of display panel and have less contained angle direction red light and the light yield of green glow, and the second electrode layer above the blue luminescent layer does not have concave lens structure, make the play plain noodles of display panel have less contained angle direction blue light relative red light and the light yield of green glow, and then compensate because red light and green glow increase along with the visual angle and attenuate for the luminance of blue light, and then improve the white picture under the positive visual angle and appear the phenomenon of colour cast under the non-positive visual angle.
Optionally, the pixel defining layer further includes a spacer located between two adjacent openings;
the second electrode layer is divided into a central electrode area covering the opening and a second edge electrode area covering the spacer area, the maximum thickness of the central electrode area is smaller than that of the edge electrode area along the direction perpendicular to the substrate, the surface of one side, away from the substrate, of the central electrode area is of a concave structure, and the surface of the concave structure is an arc surface at least at the transition position of the pixel limiting layer and the light-emitting layer; the surface of the side, away from the substrate, of the central electrode region of the second electrode layer forms a concave structure, so that the thickness of the central electrode region is smaller, the microcavity effect is weakened, light rays emitted by the light-emitting layer can directly penetrate through the second electrode layer are increased, namely the microcavity has a weakened selective effect on light, and the color cast phenomenon can be improved.
Optionally, the surface of the central electrode region on the side away from the substrate is a concave arc surface, and the thickness of the second electrode layer is gradually increased along the direction perpendicular to the substrate from the center of the central electrode region to the direction connected with the edge electrode region; and then the shape of the central electrode area is a concave lens shape, light with different wavelengths emitted by the luminous layer can be diffused into a plurality of beams of light emitted along different directions after being diffused by the concave lens formed by the central electrode area, so that human eyes can receive the light with various wavelengths under a non-normal viewing angle, the wavelength range which can be received by the human eyes under the non-normal viewing angle is close to the wavelength range which can be received under the normal viewing angle, and the color cast phenomenon is improved.
Optionally, the central electrode region of the second electrode layer includes a first sub-electrode region at a transition position between the pixel defining layer and the light emitting layer and a second sub-electrode region except the first sub-electrode region, a surface of the first sub-electrode region far away from the substrate is an arc surface, and a surface of the second sub-electrode region far away from the substrate is a plane; the light emitted by each light emitting layer can be diffused to each angle which is not perpendicular to the display panel, so that the wavelength ranges of the color lights which can be received by human eyes under each visual angle are relatively close, and the color cast phenomenon is improved. In addition, the surface of the second sub-electrode region far away from the substrate is a plane, so that the thickness of the microcavity formed by the first electrode layer (total reflection film) and the second electrode layer (semi-reflection film) is mostly kept consistent, and the color purity of the display can be improved by utilizing the microcavity effect on the basis of improving the color shift.
Optionally, the organic light emitting display panel further includes an encapsulation layer, and the encapsulation layer is located on one side of the second electrode layer away from the substrate; thereby preventing the invasion of water and oxygen and being beneficial to prolonging the service life of the display panel.
In a second aspect, embodiments of the present invention further provide an organic light emitting display device, including the organic light emitting display panel provided in the first aspect.
In a third aspect, an embodiment of the present invention further provides a method for manufacturing an organic light emitting display panel, including:
providing a substrate;
forming a first electrode layer including a plurality of first electrodes on one side of a substrate;
forming a pixel defining layer on one side of the first electrode layer far away from the substrate, wherein the pixel defining layer comprises a plurality of openings, and the openings expose the first electrode;
forming a light emitting layer in the opening;
formed on the side of the light-emitting layer and the pixel defining layer away from the substrate
A second electrode layer; wherein, at the subregion that covers the open-ended at least, the surface that the second electrode layer kept away from substrate one side has the sunk structure, and the surface of sunk structure includes the cambered surface, make the second electrode layer cover the open-ended subregion at least and be the concave lens shape, make the light of the different wavelength that the luminescent layer sent disperse the back through the concave lens that the second electrode layer formed, all can disperse for the multi-beam light of following different direction outgoing, and then make under the non-emmetropia angle, people's eye can receive the light of each wavelength, and then make under the non-emmetropia angle wavelength range that people's eye can receive and the wavelength range that can receive under the emmetropia angle be close mutually, and then improve the colour cast phenomenon.
According to the organic light-emitting display panel, the preparation method thereof and the display device provided by the embodiment of the invention, the organic light-emitting display panel is arranged in the partial region at least covering the opening, the surface of the second electrode layer, which is far away from the substrate, is provided with the concave structure, the surface of the concave structure comprises the arc surface, so that the second electrode layer is in the shape of the concave lens in the partial region at least covering the opening, light with different wavelengths emitted by the light-emitting layer can be dispersed into multiple beams of light emitted along different directions after being dispersed by the concave lens formed by the second electrode layer, and then, under a non-normal viewing angle, human eyes can receive light with various wavelengths, so that the wavelength range which can be received by the human eyes under the non-normal viewing angle is close to the wavelength range which can be received under the normal viewing angle, and the color cast phenomenon is further improved.
Drawings
Fig. 1 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an organic light emitting display device according to an embodiment of the present invention;
fig. 8 is a flowchart of a method for manufacturing an organic light emitting display panel according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As described in the background art, the conventional organic light emitting display device has a problem of color shift when viewed at a non-normal viewing angle. The inventor has found that the above problems occur because the conventional organic light emitting display device generally includes a cathode layer and an anode layer, and a light emitting layer therebetween, and the surfaces of the film layers (including the anode layer, the cathode layer, and the light emitting layer) are generally planar, so that most of the light emitted from the light emitting layer exits in a direction perpendicular to the light emitting surface of the display panel, and only a small part of the light can exit in a direction not perpendicular to the light emitting surface of the display panel, and thus, only the human eye can receive the most light at a front viewing angle (a viewing angle at which the human eye is perpendicular to the light emitting surface of the display panel), and the human eye can receive less light at a non-front viewing angle. Accordingly, the wavelength range of light that can be received by the human eye under the normal viewing angle is close to the wavelength range of light emitted by the light emitting layer, and the wavelength range of light that can be received by the human eye under the non-normal viewing angle (the included angle between the human eye and the light emitting surface of the display panel is greater as the included angle between the human eye and the light emitting surface of the display panel is closer to 0 degree and the viewing angle is larger as the included angle between the human eye and the light emitting surface of the display panel is larger than 0 degree and smaller than 90 degrees) is limited, so that the wavelength range of light that can be received by the human eye under the non-normal viewing angle, especially under the large viewing angle, is larger than the wavelength range of light that can be received by the human eye under the normal viewing angle, and further, the color cast phenomenon occurs under the non-normal viewing angle.
For the above reasons, an embodiment of the present invention provides an organic light emitting display panel, and fig. 1 is a schematic structural diagram of an organic light emitting display panel provided by an embodiment of the present invention, and referring to fig. 1, the organic light emitting display panel includes:
a substrate 110;
a first electrode layer 120 including a plurality of first electrodes 121 on one side of the substrate 110;
a pixel defining layer 130, the pixel defining layer 130 being positioned at a side of the substrate 110 where the first electrode 121 is positioned, the pixel defining layer 130 including a plurality of openings 131, the openings 131 exposing the first electrode 121;
a luminescent layer 140 on a side of the first electrode 121 away from the substrate 110;
a second electrode layer 150, wherein the second electrode layer 150 is positioned on one side of the light-emitting layer 140 and the pixel defining layer 130 away from the substrate 110; at least in a partial region covering the opening 131, a surface of the second electrode layer 150 on a side away from the substrate 110 has a concave structure, and the surface of the concave structure includes a curved surface.
In particular, the substrate 110 may provide cushioning, protection, or support for the display panel. The substrate 110 may be a flexible substrate 110, and the material of the flexible substrate 110 may be Polyimide (PI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), or the like, or may be a mixture of the foregoing materials. The substrate 110 may be a hard substrate 110 formed of glass or the like.
Optionally, the first electrode layer 120 is an anode layer, the first electrode 121 of the first electrode layer 120 is a total reflection electrode, i.e., an opaque electrode, the first electrode layer 120 may have a three-layer structure, in which the first layer and the third layer may be metal oxide layers, such as Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), and Aluminum Zinc Oxide (AZO), and the middle second layer may be a metal layer (such as silver or copper). Optionally, the second electrode layer 150 is a cathode layer, and the second electrode layer 150 is a semi-reflective electrode, which may be made of ITO or a magnesium aluminum alloy material.
The pixel defining layer 130 includes a plurality of openings 131, each of the openings 131 may define a pixel, and the pixel defining layer 130 may use an organic material such as an acrylic organic compound, a polyamide, or a polyimide, or may use an inorganic material such as silicon oxide, silicon nitride, silicon oxynitride, or aluminum oxide, which is not limited in this embodiment of the invention.
The light emitting layer 140 may include only a single film layer, i.e., only a light emitting material layer; the electrode layer may have a multilayer structure including a hole injection layer, a hole transport layer, a light emitting material layer, an electron transport layer, an electron injection layer, and the like, which are stacked from the first electrode layer 120 to the second electrode layer 150. The light emitting layer 140 includes at least a red light emitting layer 141, a green light emitting layer 142, and a blue light emitting layer 143, and thus, can realize multi-color display.
Referring to fig. 1, the second electrode layer 150 is generally a whole layer structure covering the light emitting layer 140 and the pixel defining layer 130, at least in a partial region covering the light emitting layer 140 in the opening 131, a surface of the second electrode layer 150 on a side away from the substrate 110 has a concave structure, and the surface of the concave structure includes a curved surface, so that the second electrode layer 150 is in a concave lens shape at least in a partial region covering the light emitting layer 140 in the opening 131. Fig. 1 illustrates an example in which the second electrode layer 150 has a concave structure 151 with an arc surface at a transition position between the pixel defining layer 130 and each light emitting layer 140, and then a concave lens shape is formed at a transition position between the pixel defining layer 130 and each light emitting layer 140 on a surface of the cathode layer 150 away from the substrate 110. Specifically, the concave lens has a dispersing effect on light, at least in a partial region covering the opening 131, the surface of the second electrode layer 150, which is away from the substrate 110, has a concave structure, the surface of the concave structure includes an arc surface, so that at least in a partial region covering the light-emitting layer 140 in the opening 131, the second electrode layer 150 is in the shape of a concave lens, and light emitted by the light-emitting layer 140 in a single direction can be dispersed to be emitted along multiple directions after passing through the concave lens, wherein the multiple directions of dispersion include directions of light rays which can be received by a non-normal viewing angle. For example, the light emitted from the light-emitting layer 140 along the direction perpendicular to the light-emitting surface of the organic light-emitting display panel can be diffused into a plurality of light beams along the direction perpendicular to and not perpendicular to the light-emitting surface of the display panel by the concave lens of the second electrode, so that the light beams received under a non-normal viewing angle, including a large viewing angle, are increased. Moreover, light with different wavelengths emitted by the light emitting layer 140 can be diffused into multiple beams of light emitted in different directions after being diffused by the concave lens formed by the second electrode, so that human eyes can receive light with various wavelengths under a non-normal viewing angle, the wavelength range which can be received by the human eyes under the non-normal viewing angle is close to the wavelength range which can be received under the normal viewing angle, and the color cast phenomenon is improved.
According to the organic light-emitting display panel provided by the embodiment of the invention, the surface of the second electrode layer, which is far away from the substrate, is provided with the concave structure, the surface of the concave structure comprises the arc surface, so that the second electrode layer is at least in the partial area covering the light-emitting layer in the opening and is in the shape of the concave lens, light with different wavelengths emitted by the light-emitting layer can be dispersed into multiple beams of light emitted along different directions after being dispersed by the concave lens formed by the second electrode layer, and then, under a non-normal viewing angle, human eyes can receive light with various wavelengths, so that the wavelength range which can be received by the human eyes under the non-normal viewing angle is close to the wavelength range which can be received under the normal viewing angle, and the color cast phenomenon is improved.
With reference to fig. 1, on the basis of the above scheme, optionally, the light emitting layer 140 at least includes a red light emitting layer 141, a green light emitting layer 142, and a blue light emitting layer 143, and at a transition position between the pixel defining layer 130 and each light emitting layer 140, a surface of the second electrode layer 150 on a side away from the substrate 110 has a concave structure 151 with an arc surface.
Specifically, the light emitting layer 140 includes a red light emitting layer 141, a green light emitting layer 142, and a blue light emitting layer 143 therein, so that the organic light emitting display panel can perform display of a plurality of colors. At the transition position between the pixel defining layer 130 and the light emitting layer 140, the surface of the second electrode layer 150 at the side away from the substrate 110 has a concave structure 151 with a cambered surface, that is, the second electrode layer 150 at the transition position between the pixel defining layer 130 and each light emitting layer 140 forms a concave lens structure, so that light emitted by each light emitting layer 140 along a single direction can be emitted along each direction after being diverged by the concave lens, for example, light emitted by the light emitting layer 140 along a direction perpendicular to the light emitting surface of the display panel after being diverged by the concave lens formed by the second electrode layer 150 at the transition position between the pixel defining layer 130 and the light emitting layer 140 is changed into multiple beams of light emitted along a direction perpendicular to the light emitting surface of the display panel and not perpendicular to the light emitting surface of the display panel, so that light emitted by each light emitting layer 140 can be diverged to various angles not perpendicular to the display panel, thereby ensuring that wavelength ranges of each color light received by human eyes under various viewing angles are relatively close, thereby improving the color cast phenomenon. Moreover, only at the transition position between the pixel defining layer 130 and each light emitting layer 140, the surface of the second electrode layer 150 far from the substrate 110 has a concave structure 151 with an arc surface, and in other areas of the opening 131 covered by the second electrode layer 150, the surface of the second electrode layer 150 far from the substrate 110 is still a plane, so that the thicknesses of the micro-cavities formed by the first electrode layer 120 (total reflection film) and the second electrode layer 150 (semi-reflection film) are mostly kept consistent, and further, the micro-cavity effect can be effectively utilized to improve the color purity of the display on the basis of improving the color shift.
Fig. 2 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention, referring to fig. 2, optionally, at least three light emitting layers 140 include a red light emitting layer 141, a green light emitting layer 142, and a blue light emitting layer 143, and at a transition position between the pixel defining layer 130 and the red light emitting layer 141, a surface of the second electrode layer 150 on a side away from the substrate 110 has a concave structure 151 with a cambered surface.
Specifically, the color shift phenomenon in the non-normal viewing angle in the prior art includes that white light displayed in the normal viewing angle shows color shifts of different degrees under the non-normal viewing angle condition, and the reason why the above problem occurs is that the white light is formed by mixing lights of three colors, namely red, green and blue, and the luminance attenuation speed of the lights of different colors is inconsistent with the increase of the viewing angle (the viewing angle of human eyes is gradually increased from being perpendicular to the display panel to being parallel to the light-emitting surface of the display panel), specifically, the luminance attenuation speed of the red light is faster with the increase of the viewing angle, and the attenuation speed of the green and blue lights is slower with the increase of the viewing angle, so that the white picture in the normal viewing angle shows color shifts under the non-normal viewing angle. In the organic light emitting display panel provided by this embodiment, at the transition position between the pixel defining layer 130 and the red light emitting layer 141, the surface of the second electrode layer 150 at the side away from the substrate 110 has a concave structure 151 with a cambered surface, so that the second electrode layer 150 forms a concave lens structure at the transition position between the pixel defining layer 130 and the red light emitting layer 141, and further, red light emitted by the red light emitting layer 141 is diffused by the concave lens of the second electrode layer 150, and can be emitted along the direction having a smaller included angle with the light emitting surface of the display panel, and further, the light emitting amount of red light in the direction having a smaller included angle with the light emitting surface of the display panel is increased, and the second electrode layer 150 above the blue light emitting layer 143 and the green light emitting layer 142 does not have a concave lens structure, so that the light emitting amounts of blue light and green light in the direction having a smaller included angle with the light emitting surface of the display panel are less than the light emitting amounts of red light, and further, the portions of which the luminance is attenuated more relative to green light and blue light as the viewing angle is increased, thereby improving the phenomenon that the white picture has color cast under the non-front viewing angle under the front viewing angle.
Fig. 3 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention, referring to fig. 3, optionally, the light emitting layer 140 at least includes a red light emitting layer 141, a green light emitting layer 142, and a blue light emitting layer 143, and at a transition position between the pixel defining layer 130 and the red light emitting layer 141, and a transition position between the pixel defining layer 130 and the green light emitting layer 142, a surface of the second electrode layer 150 on a side away from the substrate 110 is a concave structure 151 with an arc surface.
Specifically, as analyzed above, the white light is formed by mixing lights of three colors of red, green and blue, the light of different colors has different brightness attenuation speeds with the increase of the viewing angle, specifically, the red light has a faster brightness attenuation speed with the increase of the viewing angle, the blue light has the slowest brightness attenuation speed with the increase of the viewing angle, and the attenuation speed of the green light with the increase of the viewing angle is between the red light and the blue light. Therefore, the white picture under the front view angle has the phenomenon of color cast under the non-front view angle. In the organic light emitting display panel provided by this embodiment, at the transition position between the pixel defining layer 130 and the red light emitting layer 141, the second electrode layer 150 has the concave structure 151 with the arc surface on the surface, and the transition position between the pixel defining layer 130 and the green light emitting layer 142, the surface of the second electrode layer 150 on the side away from the substrate 110 has the concave structure 151 with the arc surface on the surface, so that the second electrode layer 150 is at the transition position between the pixel defining layer 130 and the red light emitting layer 141, and the second electrode layer 150 forms the concave lens structure at the transition position between the pixel defining layer 130 and the green light emitting layer 142, so that the red light emitted by the red light emitting layer 141 and the green light emitted by the green light emitting layer 142 are diffused by the concave lens of the second electrode layer 150, and can be emitted along the direction having a smaller included angle with the light emitting surface of the display panel, and the light emitting amount of the red light and the green light emitted by the green light emitting layer 142 is increased, the second electrode layer 150 above the blue light emitting layer 143 does not have a concave lens structure, so that the light emitting amount of the blue light relative to the red light and the green light at a smaller included angle on the light emitting surface of the display panel is less, and the brightness attenuation of the red light and the green light relative to the blue light along with the increase of the viewing angle is further compensated, so that the color cast of a white picture under a non-normal viewing angle under a normal viewing angle is improved.
Fig. 4 is a schematic structural diagram of another organic light emitting display panel provided in an embodiment of the present invention, and referring to fig. 4, optionally, the pixel defining layer 130 further includes a spacer 132 located between two adjacent openings 131;
the second electrode layer 150 divides a central electrode region 152 covering the opening 131 and an edge electrode region 153 covering the spacer region 132, the maximum thickness of the central electrode region 152 is smaller than that of the edge electrode region 153 in a direction perpendicular to the substrate 110, a surface of the central electrode region 152 on a side away from the substrate 110 is a concave structure, and a surface of the concave structure is a cambered surface at least at a transition position of the pixel defining layer 130 and the light emitting layer 140.
Referring to fig. 4, a surface of the central electrode region 152 of the second electrode layer 150 on a side away from the substrate 110 forms a concave structure. Since the second electrode layer 150 is usually formed by full-area evaporation, and the material of the entire second electrode layer 150 formed by full-area evaporation is usually uniform in thickness, in the embodiment of the invention, a recessed structure may be formed in the central electrode region 152 corresponding to the opening 131 of the pixel defining layer 130 by photolithography and other processes, that is, the thickness of the central electrode region 152 of the second electrode layer 150 is smaller than the thickness of the edge electrode region 153 covering the spacer 132. Specifically, the thickness of the central electrode region 152 is smaller than that of the edge electrode region 153, that is, the central electrode region 152 has a smaller thickness, and the edge electrode region 153 has a larger thickness, so that on one hand, the central electrode region 152 covering the opening 131 can have a larger light output amount, and the display effect can be ensured; on the other hand, the edge electrode region 153 has a smaller resistance, which is further beneficial to reducing the resistance of the second electrode layer 150, so that the conductivity of the second electrode layer 150 is better. The thickness a of the central electrode region 152 can be 9-13nm, and the thickness b of the edge electrode region 153 can be 13-25nm, so that the degree of color cast at a viewing angle of 30 degrees is 3JNCD, the degree of color cast at a viewing angle of 45 degrees is 4JNCD, the degree of color cast at a viewing angle of 60 degrees is 5JNCD, and compared with the prior art, the color cast at a non-normal viewing angle can be effectively improved; further, the turn-on voltage (voltage when the luminance reaches 1cd/m 2) can be reduced to 2V, and the power consumption of the display panel can be reduced. Because the second electrode layer 150 is a semitransparent structure, the light-emitting rate is affected by too large thickness of the central electrode region 152, and the micro-cavity effect is reduced obviously and light emission is not facilitated by too small thickness of the central electrode region 152; the thickness of the central electrode region 152 is set to 9-13nm, so that the light-emitting rate can be ensured, the microcavity effect can not be reduced obviously, and the light can be emitted. As analyzed above, the thickness of the edge electrode region 153 is thicker, which is beneficial to improving the electrical conductivity of the second electrode layer 150, but the difference between the thickness of the edge electrode region 153 and the thickness of the central electrode region 152 is not too large, and when the difference between the thickness of the edge electrode region 153 and the thickness of the central electrode region 152 is too large, light rays having a larger included angle with the vertical direction of the light-emitting surface of the display panel will be reflected or refracted by the edge electrode region 153, which affects the display effect. Therefore, the thickness of the edge electrode region 153 is set to be 13-25nm, so that the difference between the thickness of the edge electrode region 153 and the thickness of the central electrode region 152 is not too large, and the display effect of the display panel can be ensured on the basis of improving the conductive performance of the second electrode layer 150.
The second electrode layer 150 and the first electrode layer 120 are a semi-reflective film layer and a total-reflective film layer, respectively, the light-emitting layer 140 of the organic light-emitting display device is located in a microcavity formed by the semi-reflective film and the total-reflective film, a part of light emitted by the light-emitting layer 140 can directly penetrate through the semi-reflective film layer, and a part of light can be reflected for multiple times in the microcavity and then emits the semi-reflective film layer. In the embodiment of the invention, the surface of the central electrode region 152 of the second electrode layer 150, which is away from the substrate 110, forms the recessed structure, so that the thickness of the central electrode region 152 of the second electrode layer 150 is thinner, and further the microcavity effect is weakened, and in the light emitted by the light-emitting layer 140, the light emitted by the second electrode layer 150 can be directly penetrated, i.e., the microcavity has a weakened selective effect on light, and further the color shift phenomenon can be improved.
Fig. 5 is a schematic structural view of another organic light emitting display panel according to an embodiment of the present invention, and referring to fig. 5, a surface of the central electrode region 152 away from the substrate 110 is a concave arc surface, and a thickness of the second electrode layer 150 gradually increases along a direction perpendicular to the substrate 110 from a center of the central electrode region 152 to a direction of the edge electrode region 153.
Specifically, the surface of the central electrode region 152 away from the substrate 110 is a concave arc surface, so that the whole central electrode region 152 of the second electrode layer 150 is in a concave lens shape, the structure can form a concave structure on the central electrode region 152 corresponding to the opening 131 of the pixel defining layer 130 by processes such as photolithography, and the like, and can diffuse light emitted from each position of the whole light-emitting layer 140, so that more light can be received by human eyes under a non-normal viewing angle including a large viewing angle, and correspondingly, light with different wavelengths emitted by the light-emitting layer 140 can be diffused into a plurality of light beams emitted along different directions after being diffused by the concave lens formed by the second electrode layer, so that human eyes can receive light with each wavelength under the non-normal viewing angle, and the wavelength range received by the human eyes under the non-normal viewing angle is close to the wavelength range received under the normal viewing angle, thereby improving the color cast phenomenon. In addition, in the direction from the center of the central electrode region 152 to the edge electrode region 153, the thickness a of the central electrode region 152 gradually increases, that is, the central electrode region 152 has the maximum thickness at the joint with the edge electrode region 153, and the maximum thickness of the central electrode region 152 is smaller than the thickness b of the edge electrode region 153, so that on one hand, the central electrode region 152 covering the opening 131 can have a larger light output amount, and the display effect can be ensured; on the other hand, the edge electrode region 153 has a smaller resistance, which is further beneficial to reducing the resistance of the second electrode layer 150, so that the conductivity of the second electrode layer 150 is better.
With continued reference to fig. 4, based on the above scheme, optionally, the central electrode region 152 of the second electrode layer 150 includes a first sub-electrode region 1521 at a transition position of the pixel defining layer 130 and the light emitting layer 140 and a second sub-electrode region 1522 except for the first sub-electrode region 1521, a surface of the first sub-electrode region 1521 on a side away from the substrate 110 is an arc surface, and a surface of the second sub-electrode region 1522 on a side away from the substrate 110 is a plane surface.
Specifically, the surface of the first sub-electrode region 1521 on the side away from the substrate 110 is an arc surface, and when light emitted by the light-emitting layer 140 passes through the first sub-second electrode region 1521 of the second electrode layer 150, the light is diffused by the concave lens formed by the first sub-electrode region 1521, so that the light emitted by each light-emitting layer 140 can be diffused to each angle not perpendicular to the display panel, and further, the wavelength ranges of each color light which can be received by human eyes at each viewing angle are relatively close, and the color cast phenomenon is further improved. In addition, the surface of the second sub-electrode region 1522150 on the side away from the substrate 110 is a plane, so that the thickness of the microcavity formed by the first electrode layer 120 (total reflection film) and the second electrode layer 150 (semi-reflection film) is mostly kept consistent, and further, on the basis of improving color shift, the color purity of the display can be improved by using the microcavity effect.
Fig. 6 is a schematic structural diagram of another organic light emitting display panel according to an embodiment of the present invention, and referring to fig. 6, on the basis of the foregoing scheme, optionally, the organic light emitting display panel further includes an encapsulation layer 160, where the encapsulation layer 160 is located on a side of the second electrode layer 150 away from the substrate 110.
Specifically, the light emitting layer 140 is very sensitive to water and oxygen, and the water and oxygen entering the organic light emitting display panel and reacting with the light emitting layer 140 will greatly affect the service life of the organic light emitting display panel. In the organic light emitting display panel provided by this embodiment, the second electrode layer 150 is disposed with the encapsulation layer 160 on a side away from the substrate 110, where the encapsulation layer 160 may be a flexible encapsulation layer, such as a thin film encapsulation; the second electrode layer 150, the first electrode layer 120, and the light emitting layer 140 may be encapsulated in a closed space, so as to prevent the invasion of water and oxygen, which is beneficial to improving the service life of the display panel.
An organic light emitting display device is further provided in an embodiment of the present invention, fig. 7 is a schematic structural diagram of an organic light emitting display device provided in an embodiment of the present invention, and referring to fig. 7, an organic light emitting display device 10 provided in an embodiment of the present invention includes the organic light emitting display panel 100 provided in any embodiment of the present invention. The organic light emitting display device may be a mobile phone as shown in fig. 7, or may be a computer, a television, an intelligent wearable display device, and the like, which is not particularly limited in this embodiment of the present invention.
An embodiment of the present invention further provides a method for manufacturing an organic light emitting display panel, and fig. 8 is a flowchart of the method for manufacturing an organic light emitting display panel according to the embodiment of the present invention, and referring to fig. 8, the method includes:
Forming a second electrode layer; wherein, in at least the partial region covering the opening, the surface of the second electrode layer at the side far away from the substrate is provided with a concave structure, and the surface of the concave structure comprises an arc surface.
Specifically, the gradual change transparent mask comprises a plurality of subareas, wherein each subarea can correspond to a pixel area of an organic light-emitting display panel. After a second electrode material layer with uniform thickness is formed on one side, far away from the substrate, of the light emitting layer and the pixel limiting layer, the second electrode material layer is exposed by adopting a mask plate comprising a gradual change light transmission area, so that a concave arc surface is formed on the surface, far away from the substrate, of the second electrode material layer corresponding to the gradual change light transmission area, and then the second electrode layer in a concave lens shape is formed at least in a partial area covering the opening.
In the preparation method of the organic light-emitting display panel provided by the embodiment of the invention, the second electrode layer is formed on the side, away from the substrate, of the light-emitting layer and the pixel limiting layer, wherein in at least a partial region covering the opening, the surface of the side, away from the substrate, of the second electrode layer is provided with a concave structure, and the surface of the concave structure comprises an arc surface; after the light with different wavelengths emitted by the light emitting layer is dispersed by the concave lens formed by the second electrode, the light can be dispersed into a plurality of beams of light emitted in different directions, so that the human eyes can receive the light with each wavelength under a non-normal viewing angle, the wavelength range which can be received by the human eyes under the non-normal viewing angle is close to the wavelength range which can be received under the normal viewing angle, and the color cast phenomenon is improved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An organic light emitting display panel, comprising:
a substrate;
a first electrode layer including a plurality of first electrodes on one side of the substrate;
a pixel defining layer on a side of the substrate where the first electrode is disposed, the pixel defining layer including a plurality of openings exposing the first electrode;
the light-emitting layer is positioned on one side of the first electrode, which is far away from the substrate;
a second electrode layer on a side of the light emitting layer and the pixel defining layer away from the substrate; in a partial region at least covering the opening, the surface of the second electrode layer on the side away from the substrate is provided with a concave structure, and the surface of the concave structure comprises an arc surface; the second electrode layer is of a concave lens structure, so that light emitted by the light emitting layer is dispersed to angles which are not perpendicular to the display panel.
2. The organic light-emitting display panel according to claim 1, wherein the light-emitting layers include at least a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer, and at transition positions between the pixel defining layer and each of the light-emitting layers, a surface of the second electrode layer on a side away from the substrate has a concave structure with an arc surface.
3. The organic light-emitting display panel according to claim 1, wherein the light-emitting layer comprises at least a red light-emitting layer, a green light-emitting layer and a blue light-emitting layer, and a surface of the second electrode layer on a side away from the substrate at a transition position between the pixel defining layer and the red light-emitting layer has a concave structure with a cambered surface.
4. The organic light-emitting display panel according to claim 1, wherein the light-emitting layer at least comprises a red light-emitting layer, a green light-emitting layer and a blue light-emitting layer, and a surface of the second electrode layer on a side away from the substrate has a concave structure with an arc surface at a transition position between the pixel defining layer and the red light-emitting layer and a transition position between the pixel defining layer and the green light-emitting layer.
5. The organic light-emitting display panel according to claim 1, wherein the pixel defining layer further comprises a spacer between adjacent two of the openings;
the second electrode layer is divided into a central electrode area covering the opening and an edge electrode area covering the spacing area, the maximum thickness of the central electrode area is smaller than that of the edge electrode area along the direction perpendicular to the substrate, the surface of one side, far away from the substrate, of the central electrode area is of a concave structure, and the surface of the concave structure is an arc surface at least at the transition position of the pixel limiting layer and the light-emitting layer.
6. The organic light-emitting display panel according to claim 5, wherein a surface of the central electrode region on a side away from the substrate is a concave arc surface, and a thickness of the second electrode layer is gradually increased in a direction perpendicular to the substrate in a direction from a center of the central electrode region to the edge electrode region.
7. The organic light emitting display panel of claim 5, wherein the central electrode region of the second electrode layer comprises a first sub electrode region at a transition position of the pixel defining layer and the light emitting layer and a second sub electrode region except the first sub electrode region, wherein a surface of the first sub electrode region on a side away from the substrate is a curved surface, and a surface of the second sub electrode region on a side away from the substrate is a flat surface.
8. The organic light-emitting display panel according to claim 1, further comprising an encapsulation layer on a side of the second electrode layer away from the substrate.
9. An organic light emitting display device comprising the organic light emitting display panel according to any one of claims 1 to 8.
10. A method for manufacturing an organic light emitting display panel includes:
providing a substrate;
forming a first electrode layer including a plurality of first electrodes on one side of the substrate;
forming a pixel defining layer on a side of the first electrode layer remote from the substrate, the pixel defining layer including a plurality of openings exposing the first electrode;
forming a light emitting layer in the opening;
forming a second electrode layer on the light-emitting layer and the side of the pixel defining layer away from the substrate; wherein, in a partial region at least covering the opening, the surface of the second electrode layer at the side far away from the substrate is provided with a concave structure, and the surface of the concave structure comprises an arc surface; the second electrode layer is of a concave lens structure, so that light emitted by the light emitting layer is dispersed to angles which are not perpendicular to the display panel.
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| CN111276526B (en) * | 2020-02-14 | 2023-01-17 | 京东方科技集团股份有限公司 | Electroluminescent display panel and electroluminescent display device |
| CN111427205A (en) * | 2020-03-12 | 2020-07-17 | Tcl华星光电技术有限公司 | Array substrate, preparation method thereof and liquid crystal display panel |
| CN111430571A (en) * | 2020-04-09 | 2020-07-17 | 武汉华星光电半导体显示技术有限公司 | O L ED display panel |
| CN111540270A (en) * | 2020-04-29 | 2020-08-14 | 武汉华星光电半导体显示技术有限公司 | Display module and display device |
| CN111509140B (en) * | 2020-04-29 | 2023-04-14 | 京东方科技集团股份有限公司 | Display substrate, preparation method thereof and display device |
| CN111562671B (en) * | 2020-06-08 | 2024-05-28 | 昆山梦显电子科技有限公司 | Display panel based on target tracking technology and preparation method thereof |
| CN112864338A (en) * | 2021-01-12 | 2021-05-28 | 京东方科技集团股份有限公司 | Display panel, display equipment and manufacturing method |
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