CN109216584B - Flexible OLED display panel - Google Patents

Flexible OLED display panel Download PDF

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Publication number
CN109216584B
CN109216584B CN201811003883.6A CN201811003883A CN109216584B CN 109216584 B CN109216584 B CN 109216584B CN 201811003883 A CN201811003883 A CN 201811003883A CN 109216584 B CN109216584 B CN 109216584B
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layer
interface
organic layer
display unit
inorganic layer
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CN109216584A (en
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张锋
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Wuhan China Star Optoelectronics Semiconductor Display 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
    • 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
    • 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
    • H10K50/844—Encapsulations
    • 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
    • H10K50/85—Arrangements for extracting light from the devices
    • H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K77/00—Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80
    • H10K77/10—Substrates, e.g. flexible substrates
    • H10K77/111—Flexible substrates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The invention provides a flexible OLED display panel which comprises a bending display unit, wherein the bending display unit comprises a TFT array layer, a light emitting structure layer with a plurality of sub-pixels and an encapsulation structure layer, and the encapsulation structure layer comprises a refraction structure corresponding to the area where the sub-pixels are located. The deflection of the light emitting angle of the bending display unit is realized through the arrangement of the refraction structure in the packaging structure, so that the light emitting angle of the bending display unit is the same as the light emitting angle of the plane display area.

Description

Flexible OLED display panel
Technical Field
The invention relates to the technical field of display, in particular to a flexible OLED display panel.
Background
The flexible OLED display panel, as a new display technology, has many advantages over other displays, such as wide viewing angle, high contrast, fast response, low power consumption, and being foldable, and thus has strong competitiveness in the market.
In the conventional flexible OLED display panel, a display area of the flexible OLED display panel includes a flat display area and a bent display area. When the user's sight line is perpendicular to the flat display area, the sight line will form a certain angle with the bending display area, and the resonant wavelength and optical path of the emitted light generated by the flat display area and the bending display area are different, so that the colors of the flat display area and the bending display area viewed by the user are different.
Based on the above explanation, there are many disadvantages such as a deviation of a certain angle, an optical path difference, and a difference in resonance wavelength in the light emitted from the bent display area and the flat display area in the flexible OLED display panel.
Therefore, the invention makes certain improvement on the bending display area of the flexible OLED display panel.
Disclosure of Invention
The embodiment of the invention provides a flexible OLED display panel; the flexible OLED display panel aims to solve the technical problem of poor vision caused by certain angle deviation, optical path difference and different resonance wavelengths of emitted light of a bent display area and a flat display area in the existing flexible OLED display panel.
The embodiment of the invention provides a flexible OLED display panel, which comprises a plane display unit and a bending display unit arranged on the peripheral side of the plane display unit, wherein the bending display unit comprises:
a TFT array layer;
a light emitting structure layer disposed on the TFT array layer and including a plurality of sub-pixels; and
the packaging structure layer is arranged on the light emitting structure layer;
the packaging structure layer comprises a refraction structure corresponding to the area where the sub-pixel is located, so that the angle of light emitted by the sub-pixel is deflected, and the angle of the light emitted by the sub-pixel is the same as the angle of the light emitted by the plane display unit.
In a first technical solution of the present invention, the encapsulation structure layer includes a first organic layer disposed on the light emitting structure layer, a first inorganic layer disposed on the first organic layer, a second organic layer disposed on the first inorganic layer, and a second inorganic layer disposed on the second organic layer;
wherein the refraction structure is an interface between the first organic layer and the first inorganic layer or between the second organic layer and the second inorganic layer corresponding to the region of the sub-pixel, the interface is a curved surface recessed toward the light emitting structure layer,
when the interface is between the first organic layer and the first inorganic layer, the refractive index of the first organic layer is less than the refractive index of the first inorganic layer;
when the interface is between the second organic layer and the second inorganic layer, the refractive index of the second organic layer is less than the refractive index of the second inorganic layer.
In the first technical means of the present invention, the width of the interface is equal to or greater than the width of the sub-pixel.
In a second technical solution of the present invention, when the interfaces are all located on the same layer, a radius of curvature of the interface close to the planar display unit is larger than a radius of curvature of the interface far from the planar display unit.
In a third technical solution of the present invention, the encapsulation structure layer includes a first organic layer disposed on the light emitting structure layer, a first inorganic layer disposed on the first organic layer, a second organic layer disposed on the first inorganic layer, and a second inorganic layer disposed on the second organic layer;
the refraction structure comprises a first interface between the first organic layer and the first inorganic layer and corresponding to the area where the sub-pixel is located and a second interface between the second organic layer and the second inorganic layer and corresponding to the area where the sub-pixel is located, the first interface and the second interface are both curved surfaces which are concavely arranged towards the direction of the light emitting structure layer, the refractive index of the first organic layer is smaller than that of the first inorganic layer, and the refractive index of the second organic layer is smaller than that of the second inorganic layer.
In a third aspect of the present invention, a width of the first interface is less than or equal to a width of the second interface.
In a fourth technical solution of the present invention, a curvature radius of a first interface close to the planar display unit is larger than a curvature radius of a first interface far from the planar display unit or/and a curvature radius of a second interface close to the planar display unit is larger than a curvature radius of a second interface far from the planar display unit.
In a fifth technical solution of the present invention, the encapsulation structure layer includes a first organic layer disposed on the light emitting structure layer, a first inorganic layer disposed on the first organic layer, a second organic layer disposed on the first inorganic layer, and a second inorganic layer disposed on the second organic layer;
wherein the refraction structure is divided into a first refraction structure close to the flat panel display unit and a second refraction structure far away from the flat panel display unit, the first refraction structure is a first interface between the first organic layer and the first inorganic layer or between the second organic layer and the second inorganic layer corresponding to the region where the sub-pixel is located,
the second refraction structure comprises a second interface between the first organic layer and the first inorganic layer and corresponding to the region of the sub-pixel, and a third interface between the second organic layer and the second inorganic layer and corresponding to the region of the sub-pixel, wherein the first interface, the second interface and the third interface are all curved surfaces which are concavely arranged towards the direction of the light-emitting structure layer,
the refractive index of the first organic layer is less than the refractive index of the first inorganic layer, and the refractive index of the second organic layer is less than the refractive index of the second inorganic layer.
In a sixth technical solution of the present invention, the encapsulation structure layer includes a first organic layer disposed on the light emitting structure layer, a first inorganic layer disposed on the first organic layer, a second organic layer disposed on the first inorganic layer, a second inorganic layer disposed on the second organic layer, and the refractive structure disposed on the second inorganic layer;
the surface of the refraction structure is a convex cambered surface.
In a sixth technical solution of the present invention, the refractive structure is an organic or inorganic substance with high light transmittance.
Compared with the flexible OLED display panel in the prior art, the flexible OLED display panel realizes deflection of the light emitting angle of the bending display unit through the arrangement of the refraction structure in the packaging structure, so that the light emitting angle of the bending display unit is the same as that of the plane display area, and visual chromatic aberration caused by the difference of optical path or the difference of light emitting resonance wavelength between the plane display unit and the bending display unit is effectively avoided; the technical problem of poor vision caused by the fact that emitted light of a bending display area and a plane display area in an existing flexible OLED display panel has certain angle deviation, optical path difference and different resonance wavelengths is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments are briefly described below. The drawings in the following description are only some embodiments of the invention, and it will be clear to a person skilled in the art that other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic structural diagram of a first preferred embodiment of a flexible OLED display panel of the present invention;
FIG. 2 is a schematic cross-sectional view taken along line I-I' of FIG. 1, also illustrating the structure of a flat display unit of a first preferred embodiment of the flexible OLED display panel of the present invention;
FIG. 3 is a schematic cross-sectional view taken along line II-II' of FIG. 1, also illustrating the structure of a bending display unit of the first preferred embodiment of the flexible OLED display panel of the present invention;
fig. 4 is a schematic structural diagram of a bending display unit of a second preferred embodiment of the flexible OLED display panel of the present invention;
FIG. 5 is a schematic structural diagram of a bending display unit of a third preferred embodiment of the flexible OLED display panel of the present invention;
fig. 6 is a schematic structural diagram of a bending display unit of a fourth preferred embodiment of the flexible OLED display panel of the present invention;
fig. 7 is a schematic structural diagram of a bending display unit of a fifth preferred embodiment of the flexible OLED display panel of the present invention;
fig. 8 is a schematic structural diagram of a bending display unit of a sixth preferred embodiment of the flexible OLED display panel of the present invention.
Detailed Description
Refer to the drawings wherein like reference numbers refer to like elements throughout. The following description is based on illustrated embodiments of the invention and should not be taken as limiting the invention with regard to other embodiments that are not detailed herein.
Referring to fig. 1 to 3, fig. 1 is a schematic structural diagram of a flexible OLED display panel according to a first preferred embodiment of the present invention; FIG. 2 is a schematic cross-sectional view taken along line I-I' of FIG. 1, also illustrating the structure of a flat display unit of a first preferred embodiment of the flexible OLED display panel of the present invention; fig. 3 is a schematic cross-sectional view taken along line ii-ii' in fig. 1, which is also a schematic structural view of a bending display unit of the first preferred embodiment of the flexible OLED display panel of the present invention.
The flexible OLED display panel 100 of the first preferred embodiment of the present invention includes a flat display unit D1 and a bent display unit D2 disposed at a peripheral side of the flat display unit D1.
The flat display unit D1 includes a TFT array layer 11 ', a light emitting structure layer 12 ' disposed on the TFT array layer 11 ', and a package structure layer 13 ' disposed on the light emitting structure layer 12 '; the light emitting structure layer 12 ' includes an anode 121 ' disposed on the TFT array layer, a sub-pixel 122 ' disposed on the anode 121 ', and a cathode 123 ' disposed on the light emitting layer; the light emitting layer includes a plurality of sub-pixels 122'; the encapsulation structure layer 13 ' includes a first organic layer 131 ' disposed on the light emitting structure layer 12 ', a first inorganic layer 132 ' disposed on the first organic layer 131 ', a second organic layer 133 ' disposed on the first inorganic layer 132 ', and a second inorganic layer 134 ' disposed on the second organic layer 133 '.
The bending display unit D2 includes a TFT array layer 11, a light emitting structure layer 12 disposed on the TFT array layer 11, and an encapsulation structure layer 13 disposed on the light emitting structure layer 12;
specifically, the light emitting structure layer 12 includes an anode 121 disposed on the TFT array layer, a sub-pixel 122 disposed on the anode 121, and a cathode 123 disposed on the light emitting layer; the light emitting layer includes a plurality of sub-pixels 122;
wherein the package structure layer 13 includes a refractive structure corresponding to the region where the sub-pixel 122 is located.
The refraction structure is used to deflect the light emitting angle of the sub-pixel 122, so that the light emitting angle is the same as the light emitting angle of the flat panel display unit D1, thereby effectively avoiding the problem of visual chromatic aberration caused by the difference between the optical path length or the difference between the light-emitting resonant wavelengths of the flat panel display unit D1 and the bent display unit D2.
Since the flexible OLED display panel 100 is a self-luminous line from a sub-pixel in the light-emitting layer, the refraction structure is correspondingly disposed above the sub-pixel 122 for refracting the light emitted from the sub-pixel 122, so as to deflect the angle of the light emitted by the sub-pixel 122.
Among them, the encapsulation structure layer 13 includes a first organic layer 131 disposed on the light emitting structure layer 12, a first inorganic layer 132 disposed on the first organic layer 131, a second organic layer 133 disposed on the first inorganic layer 132, and a second inorganic layer 134 disposed on the second organic layer 133.
The refractive structure includes at least an interface 13a between the first organic layer 131 and the first inorganic layer 132 and/or between the second organic layer 133 and the second inorganic layer 134 corresponding to a region where the sub-pixel 122 is located. The interface 13a is a curved surface recessed toward the light emitting structure layer 12.
The refractive index of the organic layer formed on the light incident side of the interface 13a is smaller than the refractive index of the inorganic layer formed on the light emergent side of the interface 13 a.
Specifically, in the first embodiment, the refractive structure is an interface 13a between the first organic layer 131 and the first inorganic layer 132 or between the second organic layer 133 and the second inorganic layer 134 corresponding to the region where the sub-pixel 122 is located, and the interface 13a is a curved surface recessed toward the light emitting structure layer 12.
When the interface 13a is located between the first organic layer 131 and the first inorganic layer 132, the refractive index of the first organic layer 131 is smaller than that of the first inorganic layer 132.
The top surface (the surface contacting with the first inorganic layer 132) of the first organic layer 131 corresponding to the region of the sub-pixel 122 is a curved surface that is concave toward the direction of the light emitting structure layer 12, and the bottom surface of the convex curved surface of the second inorganic layer 132 is connected and matched with the top surface of the first organic layer 131, so that the thickness of the first organic layer 131 is smaller and the thickness of the first inorganic layer 132 is larger; and the interface 13a is a connection surface between the top surface of the first organic layer 131 and the bottom surface of the first inorganic layer 132, i.e., can also be understood as the top surface of the first organic layer 131.
Referring to fig. 3, the principle of light deflection in the first preferred embodiment is: the light emitted from the sub-pixel 122 is refracted at the interface 13a, and θ0＇>θ1So that the light is deflected by an angle of delta theta and then passes through the second organic layer 133 and the second inorganic layer 134 and is emitted.
In addition, by disposing the interface 13a between the first organic layer 131 and the first inorganic layer 132 such that the interface 13a is protected by the second organic layer 133 and the second inorganic layer 134 and the interface 13a is closer to the sub-pixel 122, the width of the interface 13a, i.e., the width of the top surface of the first organic layer 131 at the corresponding position, can be reduced.
The width of the interface 13a is equal to or greater than the width of the sub-pixel 122. This arrangement ensures that the emission of the sub-pixel 122 passes completely through the interface 13 a.
Wherein the material of the first organic layer 131 and the second organic layer 133 is one of Acrylic Polymer (Acrylic Polymer), Epoxy (Epoxy resin), and Silicone (Silicone); the material of the first inorganic layer 132 and the second inorganic layer 134 is one of SiNx, SiOx, Al2O, and SiC.
Of course, in the present invention, the interface may be such that when disposed between the second organic layer and the second inorganic layer, the refractive index of the second organic layer is smaller than the refractive index of the second inorganic layer. Due to the arrangement, the emitted light of the sub-pixels can be directly emitted after being deflected from the interface, and compared with the embodiment, the emitted light is prevented from passing through the second organic layer and the second inorganic layer, and the light irradiation precision is improved.
In a second preferred embodiment of the present invention, referring to fig. 4, the bending display unit includes a TFT array layer 21, a light emitting structure layer 22 having an anode 221, a sub-pixel 222 and a cathode 223, and an encapsulation structure layer 23, which is different from the first preferred embodiment in that: the bending display unit includes a plurality of sub-pixels 222 arranged in columns, and when the interfaces 23a are all located on the same layer, the curvature radius of the interface close to the plane display unit is larger than that of the interface far from the plane display unit.
The interfaces 23a are located at the same layer, that is, in the sub-pixels 222 of the plurality of column items, the interface 23a of each sub-pixel 222 is disposed between the first organic layer 231 and the first inorganic layer 232 or between the second organic layer 233 and the second inorganic layer 234. The arrangement is convenient for improving the efficiency of the process manufacturing.
The second preferred embodiment is described by taking the sub-pixel 222 with two columns as an example, and the encapsulation structure layer 23 includes a first organic layer 231 disposed on the light emitting structure layer 22, a first inorganic layer 232 disposed on the first organic layer 231, a second organic layer 233 disposed on the first inorganic layer 232, and a second inorganic layer 234 disposed on the second organic layer 233.
And the interfaces 23a of the two columns of sub-pixels 222 are both disposed between the first organic layer 231 and the first inorganic layer 232, and the radius of curvature R1 of the interface 23a close to the flat display unit is larger than the radius of curvature R2 of the interface 23a far from the flat display unit.
Wherein, the farther the sub-pixel 222 is from the flat display unit, the larger the deviation angle of the light emitted by the sub-pixel 222 is caused under the influence of the bending degree of the bending display unit. Accordingly, setting the radius of curvature R1 of the interface 23a close to the flat display unit to be larger than the radius of curvature R2 of the interface 23a far from the flat display unit increases the tangential angle of the interface 23a far from the flat display unit, thereby increasing the deflection angle, and achieving the same angle as the emitted light of the flat display unit.
In addition, in the present invention, the bending display unit includes a plurality of sub-pixels arranged in columns, and the interfaces are not necessarily located in the same layer, but may be located in different layers, for example, the interface close to the flat display unit is located between the first organic layer and the first inorganic layer, the interface far from the flat display unit is located between the second organic layer and the second inorganic layer, or the interface close to the flat display unit is located between the second organic layer and the second inorganic layer, and the interface far from the flat display unit is located between the first organic layer and the first inorganic layer.
Referring to fig. 5, in a third preferred embodiment of the present invention, the difference between the present embodiment and the first preferred embodiment is: the encapsulation structure layer 33 includes a first organic layer 331 disposed on the light emitting structure layer 32, a first inorganic layer 332 disposed on the first organic layer 331, a second organic layer 333 disposed on the first inorganic layer 332, and a second inorganic layer 334 disposed on the second organic layer 333; the light emitting structure layer 32 is disposed on the TFT array layer 31.
The refractive structure includes a first interface 33a between the first organic layer 331 and the first inorganic layer 332 corresponding to the region where the sub-pixel 322 is located, and a second interface 33b between the second organic layer 333 and the second inorganic layer 334 corresponding to the region where the sub-pixel 322 is located, the first interface 33a and the second interface 33b are both curved surfaces recessed towards the light emitting structure layer 32, and the refractive index of the first organic layer 331 is smaller than that of the first inorganic layer 332, and the refractive index of the second organic layer 333 is smaller than that of the second inorganic layer 334.
The principle of the light deflection of this third preferred embodiment is: the light emitted from the sub-pixel 322 is at the firstRefraction of light occurs at the interface 33a, and α 0 ″>α 1, and then the light is radiated to the second interface 33b, where the light is refracted again at the second interface 33b, i.e. the incident angle α of the second organic layer 3331' greater than the angle of refraction α of the second inorganic layer 3342And finally the light is deflected by an angle of delta α.
The first interface 33a and the second interface 33b are used for two refractions, so that the emitted light angle of the sub-pixel 322 is deflected twice. By the arrangement, the emitted light does not have larger angular deflection than once, the thickness of the region where the first organic layer 331 and the second organic layer 333 correspond to the sub-pixel 322 can be increased, the thickness of the first organic layer 331 and the second organic layer 333 is more uniform, and the stability of the packaging structure layer 33 is improved; that is, the radii of curvature of the first and second interfaces 33a and 33b are increased, and the tangent angles of the first and second interfaces 33a and 33b are decreased.
In addition, the structure of secondary refraction is adopted, and the precision of refraction of emitted light is improved.
In the present third preferred embodiment, the width of the first interface 33a is less than or equal to the width of the second interface 33 b. This arrangement ensures that the emitted light of the sub-pixel 322 passes completely through the interface 33 b.
Referring to fig. 6, in a fourth preferred embodiment of the present invention, a bending display unit includes a TFT array layer 41, a light emitting structure layer 42 having an anode 421, a sub-pixel 422 and a cathode 423, and an encapsulation structure layer 43, which is different from the third preferred embodiment in that: the bending display unit comprises a plurality of sub-pixels arranged in columns, and the curvature radius of a first interface close to the plane display unit is larger than that of a first interface far away from the plane display unit or/and the curvature radius of a second interface close to the plane display unit is larger than that of a second interface far away from the plane display unit.
In the fourth preferred embodiment, the description will be made taking, as an example, the case where the radius of curvature R3 of the first interface 43a close to the planar display unit is larger than the radius of curvature R4 of the first interface 43a far from the planar display unit.
Among them, the encapsulation structure layer 43 includes a first organic layer 431 disposed on the light emitting structure layer 42, a first inorganic layer 432 disposed on the first organic layer 431, a second organic layer 433 disposed on the first inorganic layer 432, and a second inorganic layer 434 disposed on the second organic layer 433.
Since the farther the sub-pixel 422 is from the flat display element, the greater the angle of deviation of the light emitted by the sub-pixel 422 due to the degree of bending of the bent display element. Accordingly, setting the radius of curvature R3 of the first interface 43a close to the flat display unit to be larger than the radius of curvature R4 of the first interface 43a far from the flat display unit increases the tangent angle of the first interface 43a far from the flat display unit, thereby increasing the deflection angle, thereby achieving the same angle as the emitted light of the flat display unit.
Referring to fig. 7, in a fifth preferred embodiment of the present invention, the difference between the present embodiment and the fourth preferred embodiment is: the encapsulation structure layer 53 includes a first organic layer 531 disposed on the light emitting structure layer 53, a first inorganic layer 532 disposed on the first organic layer 531, a second organic layer 533 disposed on the first inorganic layer 532, and a second inorganic layer 534 disposed on the second organic layer 533; the light emitting structure layer 53 is disposed on the TFT array layer 51.
The refractive structures are divided into a first refractive structure near the flat display unit and a second refractive structure far from the flat display unit, and the first refractive structure is a first interface 53a between the first organic layer 531 and the first inorganic layer 532 or between the second organic layer 533 and the second inorganic layer 534 corresponding to the region where the sub-pixel 522 is located.
The second refractive structure includes a second interface 53b between the first organic layer 531 and the first inorganic layer 532 corresponding to the region where the sub-pixel 522 is located, and a third interface 53c between the second organic layer 533 and the second inorganic layer 534 corresponding to the region where the sub-pixel 522 is located, and the first interface 53a, the second interface 53b, and the third interface 53c are curved surfaces recessed toward the light emitting structure layer 52.
The refractive index of the first organic layer 531 is smaller than that of the first inorganic layer 532, and the refractive index of the second organic layer 533 is smaller than that of the second inorganic layer 534.
In the present fifth preferred embodiment, the first interface 53a is located between the first organic layer 531 and the first inorganic layer 532.
In this embodiment, the deviation angle of the light emitted from the sub-pixel close to the flat panel display unit is smaller than the deviation angle of the light emitted from the sub-pixel far from the flat panel display unit, so that the first refraction structure close to the flat panel display unit can realize the consistent angle of the light emitted from the flat panel display unit by adopting one-time light deflection; and the second refraction structure far away from the plane unit adopts secondary light deflection to realize the consistency with the emitting light angle of the plane display unit.
Referring to fig. 8, in a sixth preferred embodiment of the present invention, the bending display unit includes a TFT array layer 61, a light emitting structure layer 62 disposed on the TFT array layer 61, and an encapsulation structure layer 63 disposed on the light emitting structure layer 62.
The light emitting structure layer 62 includes an anode 621 disposed on the TFT array layer 61, a sub-pixel 622 disposed on the anode 621, and a cathode 623 disposed on the light emitting layer; the light emitting layer includes a plurality of sub-pixels 622.
The encapsulation structure layer 63 includes a first organic layer 631 disposed on the light emitting structure layer 62, a first inorganic layer 632 disposed on the first organic layer 631, a second organic layer 633 disposed on the first inorganic layer 632, a second inorganic layer 634 disposed on the second organic layer 633, and a refractive structure 635 disposed on the second inorganic layer 634; the refractive structure 635 corresponds to the sub-pixel 622, that is, is disposed in the light emitting direction of the sub-pixel 622, and the surface of the refractive structure 635 is a convex arc surface.
In the sixth preferred embodiment, the light emitted from the sub-pixel 622 passes through the first organic layer 631, the first inorganic layer 632, the second organic layer 633 and the second inorganic layer 634 vertically, and is refracted on the convex arc surface of the refractive structure 635, so as to realize the deflection of the light angle emitted from the sub-pixel 622.
Wherein, the refraction structure is an organic or inorganic substance with high light transmittance.
In the sixth preferred embodiment, the refraction structure 635 in the package structure 63 is arranged to realize the deflection of the emission light angle of the bending display unit, so that the emission light angle of the bending display unit is the same as the emission light angle of the flat display area, and the visual chromatic aberration caused by the optical path difference or the difference of the light-emitting resonant wavelengths between the flat display unit and the bending display unit is effectively avoided.
Compared with the flexible OLED display panel in the prior art, the flexible OLED display panel realizes deflection of the light emitting angle of the bending display unit through the arrangement of the refraction structure in the packaging structure, so that the light emitting angle of the bending display unit is the same as that of the plane display area, and visual chromatic aberration caused by the difference of optical path or the difference of light emitting resonance wavelength between the plane display unit and the bending display unit is effectively avoided; the technical problem of poor vision caused by the fact that emitted light of a bending display area and a plane display area in an existing flexible OLED display panel has certain angle deviation, optical path difference and different resonance wavelengths is solved.
Although the disclosure has been shown and described with respect to one or more implementations, equivalent alterations and modifications will occur to others skilled in the art based upon a reading and understanding of this specification and the annexed drawings. The present disclosure includes all such modifications and alterations, and is limited only by the scope of the appended claims. In addition, while a particular feature of the disclosure may have been disclosed with respect to only one of several implementations, such feature may be combined with one or more other features of the other implementations as may be desired and advantageous for a given or particular application. Furthermore, to the extent that the terms "includes," has, "" contains, "or variants thereof are used in either the detailed description or the claims, such terms are intended to be inclusive in a manner similar to the term" comprising.
In summary, although the present invention has been disclosed in the foregoing embodiments, the serial numbers before the embodiments, such as "first" and "second", are used for convenience of description only, and do not limit the sequence of the embodiments of the present invention. Furthermore, the above embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be limited by the appended claims.

Claims (8)

1. The utility model provides a flexible OLED display panel, includes the plane display unit and sets up the display element that buckles of plane display unit week side, its characterized in that, the display element that buckles includes:
a TFT array layer;
a light emitting structure layer disposed on the TFT array layer and including a plurality of sub-pixels; and
the packaging structure layer is arranged on the light emitting structure layer;
the packaging structure layer comprises a refraction structure corresponding to the area where the sub-pixel is located, so that the angle of light emitted by the sub-pixel is deflected to be the same as the angle of the light emitted by the plane display unit;
the packaging structure layer comprises a first organic layer arranged on the light emitting structure layer, a first inorganic layer arranged on the first organic layer, a second organic layer arranged on the first inorganic layer and a second inorganic layer arranged on the second organic layer;
the refraction structure at least comprises an interface between the first organic layer and the first inorganic layer and/or between the second organic layer and the second inorganic layer, wherein the interface corresponds to the region where the sub-pixel is located, and the interface is a curved surface which is concavely arranged towards the direction of the light-emitting structure layer;
the refractive index of the organic layer formed on the light incident side of the interface is smaller than that of the inorganic layer formed on the light emergent side of the interface.
2. The flexible OLED display panel of claim 1, wherein the refractive structure is an interface between the first organic layer and a first inorganic layer or between the second organic layer and a second inorganic layer;
when the interface is between the first organic layer and the first inorganic layer, the refractive index of the first organic layer is less than the refractive index of the first inorganic layer;
when the interface is between the second organic layer and the second inorganic layer, the refractive index of the second organic layer is less than the refractive index of the second inorganic layer.
3. The flexible OLED display panel of claim 2, wherein the interface has a width equal to or greater than a width of the sub-pixel.
4. The flexible OLED display panel of claim 2, wherein the radius of curvature of the interface closer to the planar display unit is greater than the radius of curvature of the interface further from the planar display unit when the interfaces are all on the same layer.
5. The flexible OLED display panel of claim 1, wherein the refractive structure includes a first interface between the first organic layer and the first inorganic layer corresponding to the area of the sub-pixel, and a second interface between the second organic layer and the second inorganic layer corresponding to the area of the sub-pixel, the first interface and the second interface are both curved surfaces recessed toward the light emitting structure layer, and the refractive index of the first organic layer is smaller than the refractive index of the first inorganic layer, and the refractive index of the second organic layer is smaller than the refractive index of the second inorganic layer.
6. The flexible OLED display panel of claim 5, wherein the width of the first interface is less than or equal to the width of the second interface.
7. The flexible OLED display panel of claim 5, wherein a radius of curvature of a first interface near the planar display unit is greater than a radius of curvature of a first interface away from the planar display unit or/and a radius of curvature of a second interface near the planar display unit is greater than a radius of curvature of a second interface away from the planar display unit.
8. The flexible OLED display panel of claim 1, wherein the refractive structure is divided into a first refractive structure near the planar display unit and a second refractive structure far from the planar display unit, the first refractive structure is a first interface between the first organic layer and the first inorganic layer or between the second organic layer and the second inorganic layer corresponding to a region where the sub-pixel is located,
the second refraction structure comprises a second interface between the first organic layer and the first inorganic layer and corresponding to the region of the sub-pixel, and a third interface between the second organic layer and the second inorganic layer and corresponding to the region of the sub-pixel, wherein the first interface, the second interface and the third interface are all curved surfaces which are concavely arranged towards the direction of the light-emitting structure layer,
the refractive index of the first organic layer is less than the refractive index of the first inorganic layer, and the refractive index of the second organic layer is less than the refractive index of the second inorganic layer.
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