CN110444679B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN110444679B CN110444679B CN201910569538.7A CN201910569538A CN110444679B CN 110444679 B CN110444679 B CN 110444679B CN 201910569538 A CN201910569538 A CN 201910569538A CN 110444679 B CN110444679 B CN 110444679B
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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
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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
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
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- H—ELECTRICITY
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- 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
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Abstract
The invention discloses a display panel and a display device. The display panel comprises a substrate, a light-emitting unit positioned on the substrate and a light extraction layer positioned on one side of the light-emitting unit far away from the substrate; the substrate comprises a plane area and a bending area positioned on at least one side of the plane area; the light-emitting unit comprises a first electrode, a light-emitting functional layer and a second electrode which are sequentially stacked along the direction of the substrate pointing to the light-emitting unit; the thickness of the light-emitting functional layer corresponding to the plane area is different from that of the light-emitting functional layer corresponding to the bending area; the optical thickness of the light extraction layer corresponding to the planar region is different from the optical thickness of the light extraction layer corresponding to the bent region. The technical scheme of the invention can adjust the attenuation speed of light rays with different colors along with the visual angle, improve the visual angle color cast of the bending area, reduce the color cast degree of the bending area and the plane area and improve the display effect of the display panel. Meanwhile, the display colors of the plane area and the bending area under a small visual angle are ensured to be the same, and the display effect of the display panel is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel and a display device.
Background
In the display panel, the problem that the observation angles of a plane area and a bending area of the display panel are not synchronous under the view field exists, so that the color cast degrees of display pictures of the plane area and the bending area are different.
Disclosure of Invention
The invention provides a display panel and a display device, which are used for improving the color deviation of a bending area and reducing the difference of the color deviation degree of a plane area and the bending area.
In a first aspect, an embodiment of the present invention provides a display panel, including a substrate, a light emitting unit located on the substrate, and a light extraction layer located on a side of the light emitting unit away from the substrate;
the substrate comprises a plane area and a bending area positioned on at least one side of the plane area; the light-emitting unit comprises a first electrode, a light-emitting functional layer and a second electrode which are sequentially stacked along the direction of the substrate pointing to the light-emitting unit; the thickness of the light-emitting functional layer corresponding to the plane area is different from that of the light-emitting functional layer corresponding to the bending area; the optical thickness of the light extraction layer corresponding to the planar area is different from the optical thickness of the light extraction layer corresponding to the bending area.
Optionally, the thickness of the light-emitting functional layer corresponding to the planar area is greater than the thickness of the light-emitting functional layer corresponding to the bent area; the optical thickness of the light extraction layer corresponding to the plane area is smaller than the optical thickness of the light extraction layer corresponding to the bending area.
Optionally, the light extraction layer includes at least two layers, and the refractive index of the 2n-1 layer of light extraction layer is greater than that of the 2n layer of light extraction layer along the direction in which the substrate points to the light emitting unit; and when the light extraction layer comprises at least three layers, the refractive index of the 2n +1 layer of light extraction layer is greater than that of the 2n layer of light extraction layer along the direction that the substrate points to the light emitting unit; wherein n is a positive integer greater than or equal to 1, and the 2n-1 layer of light extraction layer is positioned on one side of the 2n layer of light extraction layer, which is adjacent to the substrate;
the thickness of at least one of the light extraction layers in the planar region is different from the thickness of at least one of the light extraction layers in the bending region, and/or the refractive index of at least one of the light extraction layers in the planar region is different from the refractive index of at least one of the light extraction layers in the bending region.
Optionally, at least one of the light extraction layers includes a first sub light extraction layer and a second sub light extraction layer in the bending region, and a refractive index of the first sub light extraction layer is greater than a refractive index of the second sub light extraction layer; the refractive indexes of the first sub light extraction layer and the second sub light extraction layer are both larger than or equal to the refractive index of the light extraction layer corresponding to the plane area, and the refractive index of at least one of the first sub light extraction layer and the second sub light extraction layer is larger than the refractive index of the light extraction layer corresponding to the plane area.
Optionally, the light extraction layer comprises a first light extraction layer and a second light extraction layer along a direction in which the substrate points to the light emitting unit; the refractive index of the first light extraction layer is greater than the refractive index of the second light extraction layer; the thickness of the first light extraction layer corresponding to the plane area is smaller than that of the first light extraction layer corresponding to the bending area, and the thickness of the second light extraction layer corresponding to the plane area is larger than that of the second light extraction layer corresponding to the bending area.
Optionally, a sum of thicknesses of the first light extraction layer and the second light extraction layer corresponding to the planar area is equal to a sum of thicknesses of the first light extraction layer and the second light extraction layer corresponding to the bending area.
Optionally, the display panel further comprises at least one inorganic layer; the inorganic layer is arranged on one side of the light extraction layer far away from the light-emitting unit; at least one of the inorganic layers has a thickness in the planar region that is different from a thickness in the inflection region; and/or at least one of the inorganic layers has a refractive index in the planar region that is different from a refractive index in the bending region.
Optionally, the inorganic layer includes a first inorganic layer and a second inorganic layer in a direction in which the substrate is directed to the light emitting unit;
the refractive index of the first inorganic layer is greater than the refractive index of the second inorganic layer; the sum of the thicknesses of the first inorganic layer and the second inorganic layer corresponding to the plane area is equal to the sum of the thicknesses of the first inorganic layer and the second inorganic layer corresponding to the bending area; the thickness of the first inorganic layer corresponding to the plane area is smaller than that of the first inorganic layer corresponding to the bending area, and the thickness of the second inorganic layer corresponding to the plane area is larger than that of the second inorganic layer corresponding to the bending area.
Optionally, the light-emitting functional layer includes a hole transport layer and an organic light-emitting layer, the hole transport layer is disposed on a side of the organic light-emitting layer adjacent to the first electrode, and a thickness of the hole transport layer corresponding to the planar region is different from a thickness of the hole transport layer corresponding to the bent region.
In a second aspect, an embodiment of the present invention further provides a display device, including the display panel provided in any embodiment of the present invention.
According to the technical scheme of the embodiment of the invention, the optical thickness of the light extraction layer corresponding to the plane area is different from that of the light extraction layer corresponding to the bending area, so that the spectrum moves towards the direction of increasing wavelength or the direction of decreasing wavelength, and the position relation between the spectrum and the light-emitting eigenspectrum of the light-emitting layer corresponding to the color is adjusted, thereby adjusting the attenuation speed of light rays with different colors along with the viewing angle, and improving the viewing angle color cast difference between the bending area and the plane area under a large viewing angle. In addition, the difference value between the optical thickness of the light extraction layer corresponding to the bending area and the optical thickness of the light extraction layer corresponding to the plane area is compensated through setting that the thickness of the light extraction functional layer corresponding to the plane area is different from the thickness of the light extraction functional layer corresponding to the bending area, so that the difference value between the wavelength corresponding to the spectral peak value of the emergent light of the light extraction layer corresponding to the bending area and the wavelength corresponding to the spectral peak value of the emergent light of the light extraction layer corresponding to the plane area is within the threshold range, the difference value between the color coordinate of the emergent light of the light extraction layer corresponding to the bending area and the color coordinate of the emergent light of the light extraction layer corresponding to the plane area is within the threshold range, the chromaticity of the emergent light of the light extraction layer corresponding to the small visual angle is equal, the display colors of the plane area and the bending area are the same under the small visual angle, and the display effect of the display panel is improved. Therefore, the scheme of the embodiment improves the color cast difference between the plane area and the bending area of the display panel under a large viewing angle, ensures that the display chromaticities of the plane area and the bending area of the display panel under a small viewing angle are consistent, and improves the display effect of the display panel.
Drawings
Fig. 1 is a schematic structural diagram of a display panel provided in the prior art;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 3 is a graph of the spectrum of blue light as a function of the optical thickness of the light extraction layer and the optical thickness of the microcavity provided by an embodiment of the present invention;
FIG. 4 is a graph of the spectrum of red light as a function of the optical thickness of the light extraction layer and the optical thickness of the microcavity provided by an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a display device 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.
The Organic Light-Emitting Diode (OLED) display panel has many advantages of being all solid-state, actively Emitting Light, fast in response speed, high in contrast, capable of achieving flexible display, and the like, and has a wider development space. The current OLED display panel utilizes the advantage of flexibility and bendability, and the bending structure is arranged at the edge of the display panel to form a bending area, so that the narrow frame and comprehensive screen display effect of the OLED display device can be realized.
When the OLED display panel adopts a top light-emitting structure, the top light-emitting structure comprises a microcavity, light can generate a microcavity effect in the microcavity, and the microcavity has the functions of selecting, narrowing and enhancing the light. However, when the viewing angle is increased, under the action of the microcavity effect, the red, green and blue three primary colors have different brightness attenuation trends along with the increase of the viewing angle, so that the display panel generates color shift under a large viewing angle. Fig. 1 is a schematic structural diagram of a display panel provided in the prior art. As shown in fig. 1, when there is a bending region 12 at the edge of the display panel, in the process of viewing by an observer, an observation viewing angle corresponding to the bending region 12 is different from an observation viewing angle corresponding to the planar region 11, so that the color shift degree of the bending region 12 is different from that of the planar region 11, which affects the display effect of the display panel. Illustratively, as the viewing angle increases, the display panel generates a red bias phenomenon, and the red bias phenomenon is more serious as the viewing angle is larger. The observation angle corresponding to the partial bending area 12 is greater than the observation angle corresponding to the plane area 11, so that the degree of reddening of the bending area 12 is greater than that of the plane area 11, thereby affecting the display effect of the display panel. For example, when the display panel is viewed from a left viewing angle, the bending region 12 located at the left side of the planar region 11 is a small viewing angle, which has a relatively small degree of color cast and does not affect the display effect of the display panel, and the viewing angle corresponding to the bending region 12 located at the right side of the planar region 11 is larger than the viewing angle corresponding to the planar region 11. The degree of reddening of inflection zone 12 to the right of planar zone 11 is therefore greater than the degree of reddening of planar zone 11. Similarly, when the display panel is viewed at the right viewing angle, the bending area 12 located at the right side of the planar area 11 is a small viewing angle, and the color cast degree is relatively small, so that the display effect of the display panel is not affected. The observation angle of view corresponding to the bending area 12 located at the left side of the plane area 11 is larger than that corresponding to the plane area 11. The degree of reddening associated with inflection zone 12 to the left of planar zone 11 is greater than the degree of reddening associated with planar zone 11.
In view of the foregoing problems, an embodiment of the present invention provides a display panel, including: the light-emitting device comprises a substrate, a light-emitting unit positioned on the substrate and a light extraction layer positioned on one side of the light-emitting unit, which is far away from the substrate;
the substrate comprises a plane area and a bending area positioned on at least one side of the plane area; the light-emitting unit comprises a first electrode, a light-emitting functional layer and a second electrode which are sequentially stacked along the direction of the substrate pointing to the light-emitting unit; the thickness of the light-emitting functional layer corresponding to the plane area is different from that of the light-emitting functional layer corresponding to the bending area; the optical thickness of the light extraction layer corresponding to the planar region is different from the optical thickness of the light extraction layer corresponding to the bent region.
Wherein, the bending area can account for 5-15% of the display panel. The optical thickness is the product of the physical thickness of the film layer and the refractive index of the medium of the film layer, and the optical thickness adjustment of the light extraction layer can be realized only by adjusting the thickness of the light extraction layer or only by adjusting the refractive index of the light extraction layer, or the optical thickness adjustment of the light extraction layer can be realized by adjusting the thickness and the refractive index in a combined manner. Because the optical thickness of the light taking-out layer has certain influence on the strength of the microcavity, the spectrum adjustment of light can be realized by adjusting the optical thickness of the light taking-out layer, so that the spectrum moves towards the direction of increasing the wavelength or towards the direction of decreasing the wavelength, the position relation between the spectrum and the light-emitting intrinsic spectrum of the corresponding color light-emitting layer is adjusted, the attenuation speed of light with different colors along with the visual angle is adjusted, the visual angle color cast of the bending area is improved, the color cast difference between the bending area and the plane area is reduced, and the display effect of the display panel in the large visual angle is improved.
Due to the fact that the spectrum of the bending area moves, the color coordinate of the emergent light of the light taking-out layer corresponding to the bending area is different from the color coordinate of the emergent light of the light taking-out layer corresponding to the plane area at a small visual angle, namely the chromaticity of the emergent light of the light taking-out layer corresponding to the bending area is different from the chromaticity of the emergent light of the light taking-out layer corresponding to the plane area.
The micro-cavity length can be adjusted by adjusting the thickness of the light-emitting functional layer, so that the wavelength corresponding to the spectral peak value is adjusted, and the difference value between the wavelength corresponding to the spectral peak value of the emergent light of the light-taking-out layer corresponding to the bending region and the wavelength corresponding to the spectral peak value of the emergent light of the light-taking-out layer corresponding to the plane region is in the threshold range by setting the thickness of the light-emitting functional layer corresponding to the bending region to be different from the thickness of the light-emitting functional layer corresponding to the plane region, so that the difference value between the color coordinate of the emergent light of the light-taking-out layer corresponding to the bending region and the color coordinate of the emergent light of the light-taking-out layer corresponding to the plane region is in the threshold range, the chromaticity of the emergent light of the light-taking-out layer corresponding to the bending region is equal or similar, the display colors of the plane region and the bending region are the same under a small visual angle, and the display effect of the display panel at the small visual angle is improved.
Therefore, in the embodiment, the thickness of the light-emitting functional layer corresponding to the plane area is different from the thickness of the light-emitting functional layer corresponding to the bending area, and the optical thickness of the light-taking layer corresponding to the plane area is different from the optical thickness of the light-taking layer corresponding to the bending area, so that the display chromaticity of the plane area and the bending area of the display panel under a small viewing angle is ensured to be consistent while the color cast difference between the plane area and the bending area of the display panel under a large viewing angle is improved, and the display effect of the display panel is improved.
Fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention. As shown in fig. 2, the thickness of the light-emitting functional layer 122 corresponding to the planar region 111 is greater than the thickness of the light-emitting functional layer 122 corresponding to the bending region 112, and the optical thickness of the light-extracting layer 130 corresponding to the planar region 111 is less than the optical thickness of the light-extracting layer 130 corresponding to the bending region 112.
The optical thickness of the light extraction layer 130 corresponding to the planar area 111 can be smaller than the optical thickness of the light extraction layer 130 corresponding to the bending area 112 by adjusting the thickness of the light extraction layer 130 corresponding to the planar area 111 to be smaller than the thickness of the light extraction layer 130 corresponding to the bending area 112, or adjusting the refractive index of the light extraction layer 130 corresponding to the planar area 111 to be smaller than the refractive index of the light extraction layer 130 corresponding to the bending area 112, or adjusting the thickness of the light extraction layer 130 corresponding to the planar area 111 to be smaller than the thickness of the light extraction layer 130 corresponding to the bending area 112 and the refractive index of the light extraction layer 130 corresponding to the planar area 111 to be smaller than the refractive index of the light extraction layer 130 corresponding to the bending area 112.
Specifically, for a display panel with a reddish bending region 112, by setting the optical thickness of the light extraction layer 130 corresponding to the planar region 111 smaller than the optical thickness of the light extraction layer 130 corresponding to the bending region 112, the spectrums of the blue light and the green light emitted from the light extraction layer 130 corresponding to the bending region 112 can be moved in the direction of increasing the wavelength, the attenuation of the brightness of the blue light and the green light is reduced, the spectrum of the red light is moved in the direction of reducing the wavelength, and the attenuation of the brightness of the red light is increased. Under a large viewing angle, the bending region 112 reduces red light and increases blue light and green light on the basis of the original red light, so that the red light of the bending region 112 can be improved, the difference of color cast degree caused by the difference of the viewing angles of the bending region 112 and the plane region 111 is reduced, and the display effect of the display panel is improved.
And the thickness of the light-emitting function layer 122 corresponding to the planar region 111 is greater than the thickness of the light-emitting function layer 122 corresponding to the bending region 112, so that the optical thickness of the microcavity formed by the first electrode 121, the light-emitting function layer 122 and the second electrode 123 corresponding to the planar region 111 is greater than the optical thickness of the microcavity formed by the first electrode 121, the light-emitting function layer 122 and the second electrode 123 corresponding to the bending region 112, and therefore the difference between the optical thickness of the light-extracting layer 130 corresponding to the bending region 112 and the optical thickness of the light-extracting layer 130 corresponding to the planar region 111 can be compensated, so that the wavelength corresponding to the spectral peak of the blue light and the green light emitted from the light-extracting layer 130 corresponding to the bending region 112 is shifted in the direction of decreasing the wavelength, the wavelength corresponding to the spectral peak of the red light is shifted in the direction of increasing the wavelength, and the difference between the wavelength corresponding to the spectral peak of the emitted light from the light-extracting layer 130 corresponding to the bending region 112 and the spectral peak of the light-extracting layer 130 corresponding to the planar region 111 is within the threshold range, therefore, the difference value between the color coordinate of the emergent light of the light extraction layer 130 corresponding to the bending region 112 and the color coordinate of the emergent light of the light extraction layer 130 corresponding to the plane region 111 is within the threshold range, and the chromaticity of the emergent light of the light extraction layer 130 corresponding to the bending region 111 is close to or equal to that of the emergent light of the light extraction layer 130 corresponding to the plane region 111, so that the display colors of the plane region 111 and the bending region 112 are the same under a small viewing angle, and the display effect of the display panel is improved.
Fig. 3 is a graph showing a spectrum of blue light according to a change in optical thickness of the light extraction layer and an optical thickness of the microcavity according to an embodiment of the present invention, and fig. 4 is a graph showing a spectrum of red light according to a change in optical thickness of the light extraction layer and an optical thickness of the microcavity according to an embodiment of the present invention. For example, as shown in fig. 3 to 4, the abscissa is the wavelength/nm, the ordinate is the normalized luminance value/a.u., the curve 1 is the spectrum of the outgoing light from the light extraction layer corresponding to the planar region, the curve 2 is the spectrum of the bending region for adjusting the optical thickness of the light extraction layer, and the curve 3 is the eigen spectrum of the light emitting unit of different colors. When the optical thickness of the light extraction layer 130 is increased, the spectrum of the blue light is shifted in a direction in which the wavelength increases, the spectrum is located at the right side of the intrinsic spectrum, and the luminance attenuation of the corresponding blue light is reduced with the peak value and the full width at half maximum of the spectrum fixed. The spectrum of the red light shifts in the direction of decreasing wavelength, the spectrum is on the left side of the intrinsic spectrum, and the luminance decay of the red light increases.
As shown in fig. 3 to 4, curve 4 is a spectrum obtained by adjusting the optical thickness of the microcavity of the light-emitting unit by the bending region and compensating for the optical thickness of the light extraction layer. Compared with the curve 2, the wavelength corresponding to the peak of the blue light spectrum moves towards the direction of decreasing the wavelength, the wavelength corresponding to the peak of the red light spectrum moves towards the direction of increasing the wavelength, the difference between the wavelength corresponding to the peak of the curve 4 (the spectrum after the bending region dimming extraction layer and the light emitting functional layer) with different colors and the wavelength corresponding to the peak of the curve 1 (the spectrum of the plane region) with the corresponding colors is reduced and is within the threshold range, namely, the color coordinate difference between the bending region and the plane region is ensured to be within the threshold range, the curve 4 of the blue light is on the right side of the curve 3 (the intrinsic spectrum), the curve 4 of the red light is on the left side of the curve 3, namely, the blue light attenuation speed is reduced, and the red light attenuation speed is increased. It should be noted that the threshold range corresponding to the difference value of the color coordinates may be a range of the difference value of the color coordinates corresponding to the difference value with the minimum chroma for human eyes. On the basis of the above technical solutions, fig. 5 is a schematic structural diagram of another display panel provided in an embodiment of the present invention. As shown in fig. 5, the light-emitting function layer 122 includes a hole transport layer 1221 and an organic light-emitting layer 1222, the hole transport layer 1221 is disposed on a side of the organic light-emitting layer 1222 adjacent to the first electrode 121, and a thickness of the hole transport layer 1221 corresponding to the planar region 111 is different from a thickness of the hole transport layer 1221 corresponding to the bending region 112.
Specifically, the hole mobility ratio of the hole transport layer 1221 is high, and the thickness of the light-emitting function layer 122 of the bending region 112 is adjusted by changing the thickness of the hole transport layer 1221 corresponding to the bending region 112, so that the influence of the electrical performance of the light-emitting unit can be reduced as much as possible.
When the light-emitting function layer 122 further includes other film layers, such as a hole injection layer, an electron blocking layer, a hole blocking layer, an electron transport layer, and an electron injection layer, the optical thickness of the microcavity of the bending region 112 can be adjusted by adjusting the thickness of at least one of the hole injection layer, the electron blocking layer, the hole blocking layer, the electron transport layer, and the electron injection layer.
On the basis of the technical schemes, the light extraction layer comprises at least two layers. The refractive index of the 2n-1 layer light extraction layer is larger than that of the 2n layer light extraction layer along the direction of the substrate pointing to the light-emitting unit; and when the light extraction layer includes at least three layers, the refractive index of the 2n +1 th layer is greater than that of the 2n th layer along the direction in which the substrate points to the light emitting unit; wherein n is a positive integer greater than or equal to 1, and the 2n-1 layer of light extraction layer is positioned on one side of the 2n layer of light extraction layer adjacent to the substrate. The at least one light extraction layer has a thickness in the planar region that is different from a thickness in the inflection region, and/or the at least one light extraction layer has a refractive index in the planar region that is different from a refractive index in the inflection region.
Specifically, the light extraction layer may be provided to have a high refractive index, for example, 1.3 to 2, to improve the light extraction effect of the light extraction layer. When the light extraction layer includes a plurality of layers, the first light extraction layer may be set to have a high refractive index, the second light extraction layer may have a low refractive index relative to the first light extraction layer, the third light extraction layer may have a high refractive index relative to the second light extraction layer, the fourth light extraction layer may have a low refractive index relative to the third light extraction layer, and so on, in a direction in which the substrate is directed to the light emitting unit. Note that the high and low refractive indices of the light extraction layers may be set to 1.3 to 2 for each light extraction layer, relative to the adjacent light extraction layer. By providing the light extraction layers with the above distribution of refractive indices, the overall light extraction effect of the light extraction layers can be improved. When the light extraction layer includes at least two layers, the optical thickness of the light extraction layer is the sum of the products of the physical thickness of each light extraction layer and the medium refractive index of the film layer.
The light taking-out layer comprises at least two layers, the thickness of the light taking-out layer in the plane area is different from that of the light taking-out layer in the bending area, and/or the refractive index of the light taking-out layer in the plane area is different from that of the light taking-out layer in the bending area, the optical thickness of the light taking-out layer in the plane area is different from that of the light taking-out layer in the bending area, the color cast difference between the bending area and the plane area is reduced, and meanwhile, the fact that the display panel has high light emitting efficiency is guaranteed.
Illustratively, the thickness of the at least one light extraction layer in the plane area is smaller than that in the bending area, and/or when the refractive index of the at least one light extraction layer in the plane area is smaller than that in the bending area, the optical thickness of the multilayer light extraction layer in the plane area is smaller than that of the multilayer light extraction layer in the bending area, and at a large viewing angle, the bending area reduces red light and increases blue light and green light on the basis of original reddish light, so that reddish light of the bending area can be improved, the difference of color cast degrees of the bending area and the plane area caused by the difference of viewing angles is reduced, and the display effect of the display panel is improved.
Exemplarily, fig. 6 is a schematic structural diagram of another display panel provided in the embodiment of the present invention. As shown in fig. 6, the light extraction layer 130 includes a first light extraction layer 131 and a second light extraction layer 132 along a direction X in which the substrate 110 is directed to the light emitting unit 120. The refractive index of the first light extraction layer 131 is greater than that of the second light extraction layer 132; the thickness of the first light extraction layer 131 corresponding to the planar area 111 is smaller than the thickness of the first light extraction layer 131 corresponding to the bending area 112, and the thickness of the second light extraction layer 132 corresponding to the planar area 111 is larger than the thickness of the second light extraction layer 132 corresponding to the bending area 112.
Specifically, the first light extraction layer 131 may be provided as a film layer for increasing the light extraction rate, and the second light extraction layer 132 may be a chromaticity adjusting layer. In addition, the second light extraction layer 132 may be porous to prevent external particles from entering the light emitting cell 120, thereby protecting the light emitting cell 120. Exemplarily, the second light extraction layer 132 may be aluminum fluoride. The refractive index of the first light extraction layer 131 is greater than that of the second light extraction layer 132, and the overall light extraction effect of the light extraction layer 130 can be improved. For example, the refractive index of the first light extraction layer 131 is 2, and the refractive index of the second light extraction layer 132 is 1.3. By adjusting the thickness of the first light extraction layer 131 corresponding to the bending region 112 and the thickness of the second light extraction layer 132 corresponding to the bending region 112, the increased optical thickness of the first light extraction layer 131 corresponding to the bending region 112 is greater than the decreased optical thickness of the second light extraction layer 132 corresponding to the bending region 112, the optical thickness of the light extraction layer 130 corresponding to the bending region 112 is integrally increased relative to the optical thickness of the plane region 111, and at a large viewing angle, the bending region 112 reduces red light and increases blue light and green light on the basis of the original red light, so that the red light color shift of the bending region 112 can be improved, the difference in the degree of the color shift caused by the difference of the viewing angles of the bending region 112 and the plane region 111 is reduced, and the display effect of the display panel is improved.
Illustratively, the thickness of the first light extraction layer 131 corresponding to the planar region 111 is 65nm, and the thickness of the first light extraction layer 131 corresponding to the bending region 112 is 75nm to 90 nm. The thickness of the second light extraction layer 132 corresponding to the planar region 111 is 60nm, and the thickness of the second light extraction layer 132 corresponding to the bending region 112 is 35nm-50 nm. By setting the difference between the thicknesses of the light extraction layers of the same layer corresponding to the planar area 111 and the bending area 112 to be greater than or equal to 10nm, more red light can be reduced, and blue light and green light can be increased, so that the red color shift of the bending area 112 can be better improved, and the difference between the degrees of the color shift of the bending area 112 and the planar area 111 caused by the difference of observation visual angles is reduced. When the difference between the thicknesses of the light extraction layers of the same layer corresponding to the planar area 111 and the bending area 112 is too large, the difference between the color coordinate of the light emitted from the planar area 111 and the color coordinate of the light emitted from the bending area 112 is large, and the chromaticity difference is large under a small viewing angle. When the chromaticity difference between the planar region 111 and the bending region 112 is too large, it is not easily compensated by adjusting the optical thickness of the microcavity of the bending region 112. Therefore, the difference between the thicknesses of the light extraction layers of the same layer corresponding to the planar region 111 and the bending region 112 is less than or equal to 25nm, so that the phenomenon that the optical thickness of the microcavity of the bending region 112 is not easily compensated by adjusting the chromaticity difference between the planar region 111 and the bending region 112 is avoided.
Preferably, the thickness of the first light extraction layer 131 corresponding to the bending region 112 is 80nm, the thickness of the second light extraction layer 132 corresponding to the bending region 112 is 45nm, the difference between the thickness of the first light extraction layer 131 corresponding to the planar region 111 and the thickness of the first light extraction layer 131 corresponding to the bending region 112 is 15nm, the difference between the thickness of the second light extraction layer 132 corresponding to the planar region 111 and the thickness of the second light extraction layer 132 corresponding to the bending region 112 is 15nm, and the thickness difference between the two layers is equal. Since the refractive index of the first light extraction layer 131 is greater than that of the second light extraction layer 132, the optical thickness of the light extraction layer 130 corresponding to the bending region 112 is greater than that of the light extraction layer 130 corresponding to the planar region 111.
With continued reference to fig. 6, the sum of the thicknesses of the first light extraction layer 131 and the second light extraction layer 132 corresponding to the planar region 111 is equal to the sum of the thicknesses of the first light extraction layer 131 and the second light extraction layer 132 corresponding to the bending region 112.
Specifically, the thickness of the light extraction layer 130 in the planar region 111 is equal to the thickness of the light extraction layer 130 in the bending region 112, so that the upper surface of the light extraction layer 130 of the display panel can be a smooth surface, which facilitates the packaging of the display panel.
On the basis of the above technical solutions, fig. 7 is a schematic structural diagram of another display panel provided in an embodiment of the present invention. As shown in fig. 7, at least one of the light extraction layers 130 includes a first sub light extraction layer 1301 and a second sub light extraction layer 1302 in the bending region 112, the refractive index of the first sub light extraction layer 1301 is greater than the refractive index of the second sub light extraction layer 1302, the refractive indices of both the first sub light extraction layer 1301 and the second sub light extraction layer 1302 are greater than or equal to the refractive index of the light extraction layer 130 corresponding to the planar region 111, and the refractive index of at least one of the first sub light extraction layer 1301 and the second sub light extraction layer 1302 is greater than the refractive index of the light extraction layer 130 corresponding to the planar region 111.
In particular, fig. 7 exemplarily shows that the display panel includes one light extraction layer 130. The refractive index of the first sub light extraction layer 1301 of the bending region 112 is greater than that of the second sub light extraction layer 1302, so that the refractive index of the light extraction layer 130 is in a high-low phase distribution. The light extraction layer 130 in the planar region 111 may be a single light extraction layer, or may include two sub-light extraction layers.
When the light extraction layer 130 of the planar region 111 is a single light extraction layer, at least one of the first sub light extraction layer 1301 and the second sub light extraction layer 1302 of the bending region 112 has a refractive index greater than that of the light extraction layer 130 of the planar region 111, and the optical thickness of the light extraction layer 130 corresponding to the bending region 112 may be greater than that of the light extraction layer 130 corresponding to the planar region 111. For example, if the refractive index of the second sub light extraction layer 1302 of the bending region 112 is equal to the refractive index of the light extraction layer 130 of the planar region 111, and the refractive index of the first sub light extraction layer 1301 of the bending region 112 is greater than the refractive index of the light extraction layer 130 of the planar region 111, the optical thickness of the light extraction layer 130 corresponding to the bending region 112 is greater than the optical thickness of the light extraction layer 130 corresponding to the planar region 111. At this time, the second sub light extraction layer 1302 of the inflection region 112 and the light extraction layer 130 of the planar region 111 may be formed in the same process.
When the light extraction layer 130 of the planar region 111 includes two sub light extraction layers, the refractive index of each of the first sub light extraction layer 1301 and the second sub light extraction layer 1302 is greater than or equal to the refractive index of the sub light extraction layer corresponding to the planar region 111, and the optical thickness of the light extraction layer 130 corresponding to the bending region 112 can be greater than the optical thickness of the light extraction layer 130 corresponding to the planar region 111.
When the display panel includes a plurality of light extraction layers 130, one light extraction layer 130 in the bend region 112 may be provided in the above-described structure, or a plurality of light extraction layers 130 may be provided in the above-described structure.
On the basis of the technical schemes, the display panel further comprises at least one inorganic layer. The inorganic layer is arranged on one side of the light extraction layer far away from the light-emitting unit, the thickness of at least one inorganic layer in the plane area is different from that in the bending area, and/or the refractive index of at least one inorganic layer in the plane area is different from that in the bending area.
Specifically, the inorganic layer may be a first inorganic layer of the thin film encapsulation structure adjacent to the light emitting unit. Similarly to the light extraction layer, the adjustment of the optical thickness of the inorganic layer may be achieved by adjusting only the thickness of the inorganic layer or only the refractive index of the inorganic layer, or may be achieved by adjusting the thickness and the refractive index in combination. Because the optical thickness of the inorganic layer has certain influence on the strength of the microcavity, the spectrum adjustment of light can be realized by adjusting the optical thickness of the inorganic layer, so that the spectrum moves towards the direction of increasing the wavelength or towards the direction of decreasing the wavelength, the position relation between the spectrum and the light-emitting intrinsic spectrum of the corresponding color light-emitting layer is adjusted, the attenuation speed of the light with different colors along with the viewing angle is adjusted, and the viewing angle color cast of the bending region is improved.
For example, the thickness of the inorganic layer in the planar region may be smaller than that in the bending region, and/or the refractive index of the inorganic layer in the planar region may be smaller than that in the bending region, so that the optical thickness of the inorganic layer in the planar region is smaller than that in the bending region, the spectrum of the blue light and the green light of the emergent light of the inorganic layer corresponding to the bending region is shifted toward the direction of increasing wavelength, the spectrum is located at the right side of the intrinsic spectrum, and the luminance attenuation of the corresponding blue light and the green light is reduced. The spectrum of the red light shifts in the direction of decreasing wavelength, the spectrum is on the left side of the intrinsic spectrum, and the luminance decay of the red light increases. Under a large visual angle, the bending area reduces red light and increases blue light and green light on the basis of the original reddish light, so that the reddish color cast of the bending area can be improved, the difference of the color cast degree of the bending area and the plane area caused by the difference of the observation visual angles is reduced, and the display effect of the display panel is improved.
When the display panel includes both the light extraction layer and the inorganic layer, the optical thickness of the light extraction layer in the bending region may be increased, or the optical thickness of the inorganic layer in the bending region may be increased, or both the optical thickness of the light extraction layer in the bending region and the optical thickness of the inorganic layer may be increased.
Exemplarily, fig. 8 is a schematic structural diagram of another display panel provided in the embodiment of the present invention. As shown in fig. 8, the inorganic layer 140 includes a first inorganic layer 141 and a second inorganic layer 142 along a direction X in which the substrate 110 is directed to the light emitting unit 120, and a refractive index of the first inorganic layer 141 is greater than a refractive index of the second inorganic layer 142. The sum of the thicknesses of the first inorganic layer 141 and the second inorganic layer 142 corresponding to the planar region 111 is equal to the sum of the thicknesses of the first inorganic layer 141 and the second inorganic layer 142 corresponding to the bending region 112, the thickness of the first inorganic layer 141 corresponding to the planar region 111 is smaller than the thickness of the first inorganic layer 141 corresponding to the bending region 112, and the thickness of the second inorganic layer 142 corresponding to the planar region 111 is larger than the thickness of the second inorganic layer 142 corresponding to the bending region 112.
Specifically, by adjusting the thickness of the first inorganic layer 141 corresponding to the bending region 112 and the thickness of the second inorganic layer 142 corresponding to the bending region 112, the increased optical thickness of the first inorganic layer 141 corresponding to the bending region 112 is greater than the decreased optical thickness of the second inorganic layer 142 corresponding to the bending region 112, the optical thickness of the inorganic layer 140 corresponding to the bending region 112 is increased as a whole relative to the optical thickness of the planar region 111, and at a large viewing angle, the bending region 112 reduces red light and increases blue light and green light on the basis of the original red light, so that the red light color shift of the bending region 112 can be improved, the difference in the degree of the color shift between the bending region 112 and the planar region 111 caused by the difference in the viewing angle is reduced, and the display effect of the display panel is improved.
In addition, the thickness of the inorganic layer 140 in the planar region 111 is equal to the thickness of the inorganic layer 140 in the bending region 112, so that the upper surface of the inorganic layer 140 of the display panel is a smooth surface, which facilitates the packaging of the display panel. In addition, the inorganic layer 140 may be any inorganic layer in the thin film encapsulation layer, or may be another inorganic layer of the light extraction layer 130 away from the substrate 110, and this embodiment is not particularly limited.
The embodiment also provides a display device. Fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 9, the display device 100 includes a display panel 101 provided in any embodiment of the present invention.
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 (9)
1. A display panel is characterized by comprising a substrate, a light emitting unit positioned on the substrate and a light extraction layer positioned on one side of the light emitting unit far away from the substrate;
the substrate comprises a plane area and a bending area positioned on at least one side of the plane area; the light-emitting unit comprises a first electrode, a light-emitting functional layer and a second electrode which are sequentially stacked along the direction of the substrate pointing to the light-emitting unit; the thickness of the light-emitting functional layer corresponding to the plane area is different from that of the light-emitting functional layer corresponding to the bending area; the optical thickness of the light extraction layer corresponding to the plane area is different from the optical thickness of the light extraction layer corresponding to the bending area;
the light extraction layer comprises at least two layers, and the refractive index of the 2n-1 layer of light extraction layer is greater than that of the 2n layer of light extraction layer along the direction of the substrate pointing to the light-emitting unit; and when the light extraction layer comprises at least three layers, the refractive index of the 2n +1 layer of light extraction layer is greater than that of the 2n layer of light extraction layer along the direction that the substrate points to the light emitting unit; wherein n is a positive integer greater than or equal to 1, and the 2n-1 layer of light extraction layer is positioned on one side of the 2n layer of light extraction layer, which is adjacent to the substrate;
the thickness of at least one of the light extraction layers in the planar region is different from the thickness of at least one of the light extraction layers in the bending region, and/or the refractive index of at least one of the light extraction layers in the planar region is different from the refractive index of at least one of the light extraction layers in the bending region.
2. The display panel according to claim 1, characterized in that:
the thickness of the luminous functional layer corresponding to the plane area is larger than that of the luminous functional layer corresponding to the bending area; the optical thickness of the light extraction layer corresponding to the plane area is smaller than the optical thickness of the light extraction layer corresponding to the bending area.
3. The display panel according to claim 1, wherein at least one of the light extraction layers comprises a first sub light extraction layer and a second sub light extraction layer in the bend region, and a refractive index of the first sub light extraction layer is larger than a refractive index of the second sub light extraction layer; the refractive indexes of the first sub light extraction layer and the second sub light extraction layer are both larger than or equal to the refractive index of the light extraction layer corresponding to the plane area, and the refractive index of at least one of the first sub light extraction layer and the second sub light extraction layer is larger than the refractive index of the light extraction layer corresponding to the plane area.
4. The display panel according to claim 1, wherein the light extraction layer includes a first light extraction layer and a second light extraction layer in a direction in which the substrate is directed to the light emitting unit; the refractive index of the first light extraction layer is greater than the refractive index of the second light extraction layer; the thickness of the first light extraction layer corresponding to the plane area is smaller than that of the first light extraction layer corresponding to the bending area, and the thickness of the second light extraction layer corresponding to the plane area is larger than that of the second light extraction layer corresponding to the bending area.
5. The display panel according to claim 4, wherein the sum of the thicknesses of the first light extraction layer and the second light extraction layer corresponding to the planar region is equal to the sum of the thicknesses of the first light extraction layer and the second light extraction layer corresponding to the bent region.
6. The display panel according to claim 1 or 2, further comprising at least one inorganic layer; the inorganic layer is arranged on one side of the light extraction layer far away from the light-emitting unit; the thickness of at least one of the inorganic layers in the planar region is different from the thickness of at least one of the inorganic layers in the inflection region, and/or the refractive index of at least one of the inorganic layers in the planar region is different from the refractive index of at least one of the inorganic layers in the inflection region.
7. The display panel according to claim 6, wherein the inorganic layer includes a first inorganic layer and a second inorganic layer in a direction in which the substrate is directed to the light emitting unit;
the refractive index of the first inorganic layer is greater than the refractive index of the second inorganic layer; the sum of the thicknesses of the first inorganic layer and the second inorganic layer corresponding to the plane area is equal to the sum of the thicknesses of the first inorganic layer and the second inorganic layer corresponding to the bending area; the thickness of the first inorganic layer corresponding to the plane area is smaller than that of the first inorganic layer corresponding to the bending area, and the thickness of the second inorganic layer corresponding to the plane area is larger than that of the second inorganic layer corresponding to the bending area.
8. The display panel according to claim 1, wherein the light-emitting functional layer comprises a hole transport layer and an organic light-emitting layer, the hole transport layer is disposed on a side of the organic light-emitting layer adjacent to the first electrode, and a thickness of the hole transport layer corresponding to the planar region is different from a thickness of the hole transport layer corresponding to the bent region.
9. A display device comprising the display panel according to any one of claims 1 to 8.
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| CN110890476B (en) * | 2019-11-29 | 2022-06-10 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN112038507B (en) * | 2020-09-21 | 2023-04-25 | 云谷（固安）科技有限公司 | Display panel forming method, display panel and display device |
| CN112838176B (en) * | 2021-01-21 | 2022-05-27 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
| CN113270465B (en) * | 2021-05-25 | 2023-05-12 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
| CN113823757B (en) * | 2021-09-18 | 2024-08-16 | 成都京东方光电科技有限公司 | Display panel and display device |
| CN114267804A (en) * | 2021-12-14 | 2022-04-01 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
| CN114447251B (en) * | 2022-01-28 | 2024-07-12 | 厦门天马显示科技有限公司 | Display panel and display device |
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