CN110767815B - OLED display panel and display device - Google Patents

OLED display panel and display device Download PDF

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Publication number
CN110767815B
CN110767815B CN201911062000.3A CN201911062000A CN110767815B CN 110767815 B CN110767815 B CN 110767815B CN 201911062000 A CN201911062000 A CN 201911062000A CN 110767815 B CN110767815 B CN 110767815B
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layer
pixels
light
display panel
organic electroluminescent
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CN110767815A (en
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宋江
郭永林
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • 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
    • 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
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The invention relates to the technical field of display, discloses the technical field, and particularly relates to an OLED display panel and a display device. The OLED display panel comprises a substrate layer, an organic electroluminescent layer and an encapsulation layer; the organic electroluminescent layer comprises red pixels, green pixels, blue pixels and pixel boundary layers for limiting pixel areas of different colors; the OLED display panel is provided with a plane area and a bending area, transition inclined planes corresponding to red light pixels and green light pixels are formed on the surface of one side, facing the organic electroluminescent layer, of the substrate layer in the bending area, so that included angles are formed between the light emitting surfaces of the red light pixels and the green light pixels and the light emitting surface of the packaging layer, the light emitting paths of the red light and the green light are lengthened, more attenuation can be generated, the light quantity of the red light and the green light emitted into eyes of an observer is reduced, the attenuation of the intensity of the red light and the green light is realized, and the phenomenon of yellow display is weakened or eliminated after the red light, the green light and the blue light which finally reach the eyes of the observer are synthesized.

Description

OLED display panel and display device
Technical Field
The invention relates to the technical field of display, in particular to an OLED display panel and a display device.
Background
Organic Light Emitting Diodes (OLEDs) have a wide application prospect in flat panel display and lighting applications because of their advantages of active Light emission, all solid state, low driving voltage, high efficiency, fast response speed, wide viewing angle, simple fabrication process, and capability of realizing large-area and flexible display.
With the rapid development and innovation of the mobile intelligent terminal, the individual requirements of consumers on the mobile intelligent terminal equipment are continuously improved, and the OLED curved screen is produced. The prior OLED curved screen has the advantage of high screen ratio, but has the bad problems of edge color cast and the like. For example, when the bending angle of the curved screen glass cover plate is large (e.g., 88 ° to 90 °), a problem of yellowing of the bent area occurs. The reason for this is that blue light is weaker than red light and green light, and the reason for the weaker blue light is mainly due to the following aspects: 1. in the prior art, the light attenuation of blue light is more serious than that of red light and green light; 2. the absorption of each film layer of the glass cover plate to blue light is higher than the intensity of red light and green light, and the integral transmittance of the blue light is lower than that of the red light and the green light; 3. the waveguide effect enables multiple light beams to interfere in the device, reflected light is reflected for multiple times, and the difference of interference wave peak positions is caused by the difference of optical path lengths, so that the attenuation of blue light is further increased.
Disclosure of Invention
The invention discloses an OLED display panel and a display device, which are used for solving the problem of yellow light emission in a bending area of a display screen.
In order to achieve the purpose, the invention provides the following technical scheme:
in one aspect, the present invention provides an OLED display panel including: the packaging structure comprises a base layer, an organic electroluminescent layer formed on the surface of one side of the base layer and an encapsulation layer arranged on the side, away from the base layer, of the organic electroluminescent layer; the organic electroluminescent layer comprises red pixels, green pixels, blue pixels and pixel boundary layers for limiting pixel areas of different colors;
the OLED display panel is provided with a plane area and a bending area, and transition inclined planes respectively corresponding to the red light pixels and the green light pixels are formed on the surface of one side, facing the organic electroluminescent layer, of the substrate layer in the bending area so that included angles are formed between light emitting surfaces of the red light pixels and the green light pixels and a light emitting surface of the packaging layer.
According to the OLED display panel, the transition inclined planes are arranged at the bottoms of the red light pixels and the green light pixels, the light emitting directions of the red light pixels and the green light pixels are inclined to form a certain included angle with the plane where the light emitting surface is located, the light emitting path of the light is lengthened, more attenuation can be generated in the process of passing through the packaging layer, meanwhile, the light quantity of the red light pixels and the green light pixels which are emitted into eyes of an observer is reduced, the intensity of the red light and the green light is attenuated, and the phenomenon of yellow display is weakened or eliminated after the red light, the green light and the blue light which finally reach the eyes of the observer are synthesized.
Optionally, the base layer comprises a substrate and a flat layer formed between the substrate and the organic electroluminescent layer;
at the inflection zone, the planar layer includes a first planar region and a second planar region and a transition region formed between the first planar region and the second planar region, the first planar region having a thickness greater than a thickness of the second planar region;
the side surface of the transition region facing away from the substrate forms the transition slope.
Optionally, the base layer comprises a substrate and a flat layer formed between the substrate and the organic electroluminescent layer;
and an inclined plane block is arranged between the substrate and the flat layer, and the surface of one side of the inclined plane block, which deviates from the substrate, forms the transition inclined plane.
Optionally, the bevel block is made of a metal material.
Optionally, the bevel block is made of a titanium-aluminum composite material or molybdenum.
Optionally, the organic electroluminescent device further comprises an anode disposed between the substrate layer and the organic electroluminescent layer and a cathode disposed between the organic electroluminescent layer and the encapsulation layer.
Optionally, a spacer is further disposed between the cathode and the organic electroluminescent layer.
In another aspect, the present invention further provides a display device including any one of the OLED display panels described above.
Drawings
Fig. 1 is a schematic structural diagram of an OLED display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an OLED display panel in which a bending region corresponds to a red pixel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an OLED display panel with a bending region corresponding to a blue pixel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an OLED display panel in which a bending region corresponds to a red pixel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another OLED display panel according to an embodiment of the invention, where the bending region corresponds to a red pixel.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
An embodiment of the present invention provides an OLED display panel, as shown in fig. 1, having a planar area a and a bending area a', and a cross-sectional structure of the OLED display panel is shown in fig. 2, including: the organic electroluminescent display comprises a substrate layer 1, an organic electroluminescent layer formed on the surface of one side of the substrate layer 1 and an encapsulation layer 3 arranged on the side, away from the substrate layer 1, of the organic electroluminescent layer, wherein the organic electroluminescent layer comprises red pixels 21, green pixels 22, blue pixels 23 and pixel definition layers 24 for defining pixel areas of different colors. An anode 4 is further provided between the base layer 1 and the organic electroluminescent layer, a cathode 5 is provided between the organic electroluminescent layer and the encapsulating layer 3, and a spacer 6 is further provided between the cathode 5 and the organic electroluminescent layer.
In order to solve the problem that the light-emitting display in the bending area a' may yellow, transition slopes M corresponding to the red pixels 21 and the green pixels 22 are formed on the surface of the substrate layer 1 facing the organic electroluminescent layer 2 in this embodiment to incline the light-emitting directions of the red pixels 21 and the green pixels 22 (only the red pixels 21 are taken as an example in fig. 2), so that the light-emitting surfaces of the red pixels 21 and the green pixels 22 form an included angle with the light-emitting surface of the encapsulation layer 3. This configuration change results in a longer path for the red 21 and green 22 pixels, and more attenuation occurs during the light emission through the encapsulation layer 3, and at the same time, the amount of light emitted by the red 21 and green 22 pixels is reduced perpendicular to the eye of the viewer, and the intensity of the red and green light is attenuated.
Of course, the green pixel 22 is the same as the case of one red pixel 21 shown in fig. 2, and only the red pixel 21 is replaced with the green pixel 22. Correspondingly, as shown in fig. 3, the display panel structure corresponding to the blue pixel 23 is that the surface of the substrate layer 1 corresponding to the blue pixel 23 facing the blue pixel 23 is horizontal to the light emitting surface, and the blue light emitting light emitted by the blue pixel 23 is vertical to the surface of the encapsulation layer 3. After the red light emitted by the red light pixel 21 with the changed light-emitting angle, the green light emitted by the green light pixel 22 and the blue light emitted by the blue light pixel 23 are synthesized, the intensities of the red light and the green light with weakened intensity and the intensity of the blue light pixel 23 with self-weakened intensity are balanced, and the phenomenon of yellow display can be improved.
It should be noted that the angle of the transition slope is not limited, and simulation needs to be performed according to the structural parameters and the display requirements of the display panel at the actual production cost, so that the red light pixel 21 and the green light pixel 22 adjusted by the transition slope M can emit red light and green light with appropriate angles to cooperate with blue light attenuated by the blue light pixel 23 itself.
In the OLED display panel, the transition inclined planes M are arranged at the bottoms of the red light pixels and the green light pixels, and the light emitting directions of the red light pixels 21 and the green light pixels 22 are inclined to form a certain included angle with the plane where the light emitting surface is located, so that the intensity of the red light and the green light is attenuated when the red light and the green light are emitted, and the yellow phenomenon can be reduced or even eliminated after the red light and the green light are synthesized with the blue light attenuated by the OLED display panel.
In one possible embodiment, as shown in fig. 4, the base layer 1 includes a substrate 11 and a planarization layer 12 formed between the substrate 11 and the organic electroluminescent layer; the surface of the substrate layer 1 facing the flat layer 12 is parallel to the light-emitting surface of the encapsulation layer 3 (equivalent to the surface of the substrate layer 1 facing the flat layer 12 and the light-emitting surface of the whole display panel); the structure of the substrate layer 1 in the bending region a' is improved, specifically, the flat layer 12 includes a first flat region 12A and a second flat region 12B, and a transition region 12C formed between the first flat region 12A and the second flat region 12B, the thickness of the first flat region 12A is greater than that of the second flat region 12B, where a side surface of the transition region 12C facing away from the substrate 11 forms the above-mentioned transition slope, that is, the red pixels 21 are disposed on the transition slope.
In another possible embodiment, as shown in fig. 5, the base layer 1 also includes a substrate 11 and a flat layer 12 formed between the substrate 11 and the organic electroluminescent layer, a surface of the base layer 1 facing the flat layer 12 and a surface of the flat layer 12 facing the organic electroluminescent layer are parallel, and both are parallel to the light emitting surface of the encapsulation layer 3 (corresponding to a surface of the base layer 1 facing the flat layer 12 and a surface of the flat layer 12 facing the organic electroluminescent layer and the light emitting surface of the whole display panel); corresponding to the red pixels 21 (green pixels 22), a bevel block 7 is arranged between the substrate 11 and the planarization layer 12, the surface of the bevel block 7 on the side facing away from the substrate 11 forming the above-mentioned transitional bevel.
The inclined plane can be directly made of a metal film layer material of a backboard circuit, so that the process and the cost can be saved, for example, Ti (titanium) -Al (aluminum) -Ti (titanium) layered composite material used as a source and a drain or Mo (molybdenum) used as a grid is used.
It should be noted that fig. 4 and fig. 5 each only show the case of corresponding to one red pixel 21, and the green pixel 22 is the same, and only the red pixel 21 is replaced by the green pixel 22.
Based on the same invention idea, the embodiment of the invention further provides a display device, which comprises any one of the above OLED display panels, and the display device can obtain a better display effect because the problem of yellowing of the bent part of the display panel is relieved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (8)

1. An OLED display panel, comprising: the packaging structure comprises a base layer, an organic electroluminescent layer formed on the surface of one side of the base layer and an encapsulation layer arranged on the side, away from the base layer, of the organic electroluminescent layer; the organic electroluminescent layer comprises red pixels, green pixels, blue pixels and pixel defining layers for defining pixel areas of different colors;
the OLED display panel is provided with a plane area and a bending area, transition inclined planes corresponding to the red light pixels and the green light pixels respectively are formed on the surface of one side, facing the organic electroluminescent layer, of the substrate layer, so that included angles are formed between the light emitting surfaces of the red light pixels and the green light pixels and the light emitting surface of the packaging layer, and the light emitting paths of the red light pixels and the green light pixels are longer than the light emitting path of the blue light pixels.
2. The OLED display panel of claim 1, wherein the base layer includes a substrate and a planar layer formed between the substrate and the organic electroluminescent layer;
at the inflection zone, the planar layer includes a first planar region and a second planar region and a transition region formed between the first planar region and the second planar region, the first planar region having a thickness greater than a thickness of the second planar region;
the side surface of the transition region, which faces away from the substrate, forms the transition slope.
3. The OLED display panel of claim 1, wherein the base layer includes a substrate and a planar layer formed between the substrate and the organic electroluminescent layer;
and an inclined plane block is arranged between the substrate and the flat layer, and the surface of one side of the inclined plane block, which is deviated from the substrate, forms the transition inclined plane.
4. The OLED display panel of claim 3, wherein the bezel block is a metal.
5. The OLED display panel of claim 4, wherein the bevel block is made of titanium-aluminum composite or molybdenum.
6. The OLED display panel of claim 1, further comprising an anode disposed between the base layer and the organic electroluminescent layer and a cathode disposed between the organic electroluminescent layer and the encapsulation layer.
7. The OLED display panel according to claim 6, wherein a spacer is further disposed between the cathode and the organic electroluminescent layer.
8. A display device comprising the OLED display panel according to any one of claims 1 to 7.
CN201911062000.3A 2019-11-01 2019-11-01 OLED display panel and display device Active CN110767815B (en)

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CN112038493B (en) * 2020-08-17 2022-05-31 武汉华星光电半导体显示技术有限公司 Display panel and display device
CN113193140B (en) * 2021-04-16 2022-07-12 武汉华星光电半导体显示技术有限公司 Display panel and manufacturing method thereof
CN114023897B (en) * 2021-11-10 2024-04-30 云谷（固安）科技有限公司 Display panel and display device

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