CN110828699B - Display panel and electronic device - Google Patents
Display panel and electronic device Download PDFInfo
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- CN110828699B CN110828699B CN201911179028.5A CN201911179028A CN110828699B CN 110828699 B CN110828699 B CN 110828699B CN 201911179028 A CN201911179028 A CN 201911179028A CN 110828699 B CN110828699 B CN 110828699B
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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
- H10K50/852—Arrangements for extracting light from the devices comprising a resonant cavity structure, e.g. Bragg reflector pair
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Abstract
The embodiment of the invention relates to a display panel and an electronic device, wherein the display panel comprises: a second electrode, a light-emitting layer, and a first electrode which are stacked in this order; the optical compensation layer is positioned on one side, facing the light emitting layer, of the second electrode and is arranged with the light emitting layer and the first electrode in a stacked mode, the light transmittance of the material of the optical compensation layer is larger than that of the material of the first electrode, at least one optical microcavity is arranged in the display panel, and the optical compensation layer is used for increasing the optical path of the optical microcavity. The invention is beneficial to meeting the requirement of high light transmittance of the display panel and improving the display effect of the display panel.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel and an electronic device.
Background
In recent years, with the popularization of electronic devices, display panel products have been developed rapidly, more and more display panels are gradually on the market, consumers have higher and higher requirements for the quality of the display images of the display panels, and the brightness, color purity and resolution of the display panels directly affect the image quality of the display panels.
The quality of the display panel of the prior art is to be improved.
Disclosure of Invention
The embodiment of the invention provides a display panel and electronic equipment, which can meet the requirement of high light transmittance of the display panel and improve the display effect of the display panel.
To solve the above technical problem, an embodiment of the present invention provides a display panel, including: the light-emitting diode comprises a second electrode, a light-emitting layer and a first electrode which are sequentially stacked, wherein the light transmittance of a material of the surface of the second electrode facing the first electrode is smaller than that of a material of the surface of the first electrode facing the second electrode; the optical compensation layer is positioned on one side, facing the light emitting layer, of the second electrode and is arranged with the light emitting layer and the first electrode in a stacked mode, the light transmittance of the material of the optical compensation layer is larger than that of the material of the first electrode, at least one optical microcavity is arranged in the display panel, and the optical compensation layer is used for increasing the optical path of the optical microcavity.
In addition, the optical compensation layer is located between the first electrode and the second electrode, the second electrode and the first electrode form an optical microcavity, and the optical compensation layer is used for increasing the optical length of the optical microcavity. Therefore, the emergent light spectrum peak position of the display panel can meet the preset requirement, and the display effect of the display panel is improved.
In addition, the display panel further comprises an electron transport layer and a hole transport layer, wherein the electron transport layer and the hole transport layer are respectively positioned on two opposite sides of the light-emitting layer and are stacked with the first electrode and the second electrode; the optical compensation layer is positioned on the surface of the electron transport layer facing the light-emitting layer or on the surface of the electron transport layer far away from the light-emitting layer, and the material of the optical compensation layer is the same as that of the electron transport layer; or the optical compensation layer is positioned on the surface of the hole transport layer facing to the light-emitting layer or on the surface of the hole transport layer far away from the light-emitting layer, and the material of the optical compensation layer is the same as that of the hole transport layer. Therefore, the transmission efficiency of current carriers is improved while the spectral peak position of emergent light of the display panel is ensured to meet the preset requirement, and the luminous efficiency of the display panel is further improved.
In addition, the display panel further comprises an electron injection layer and a hole injection layer, wherein the electron injection layer is positioned on the surface of the electron transport layer far away from the light-emitting layer, and the hole injection layer is positioned on the surface of the hole transport layer far away from the light-emitting layer; the optical compensation layer is positioned on the surface of the electron injection layer far away from the light-emitting layer or on the surface of the electron injection layer facing the light-emitting layer, and the material of the optical compensation layer is the same as that of the electron injection layer; or the optical compensation layer is positioned on the surface of the hole injection layer far away from the light-emitting layer or on the surface of the hole injection layer facing the light-emitting layer, and the material of the optical compensation layer is the same as that of the hole injection layer.
In addition, the optical compensation layer is positioned on one side of the first electrode far away from the second electrode. Therefore, the structure change of the display panel is favorably reduced, and unexpected influence caused by the arrangement of the optical compensation layer is avoided; the microcavity effect can be strengthened in the setting of optical compensation layer, shortens the width of display panel emergent light spectrum, and then improves emergent light purity, and is favorable to guaranteeing that the position and the shape of the spectrum of display panel emergent light satisfy and predetermine the demand to improve the homogeneity of display panel emergent light, improve display panel's display effect.
In addition, the display panel further comprises an electrode covering layer, the electrode covering layer is positioned on one side of the first electrode, which is far away from the light-emitting layer, and the optical compensation layer is positioned between the electrode covering layer and the first electrode, or the optical compensation layer is positioned on the surface of the electrode covering layer, which is far away from the first electrode; preferably, the material of the optical compensation layer is the same as the material of the electrode cover layer. Therefore, the manufacturing method is beneficial to reducing the process steps and shortening the manufacturing period of the display panel.
In addition, the optical compensation layer includes: a first optical compensation layer between the first electrode and the second electrode; a second optical compensation layer on a side of the first electrode away from the second electrode. The first optical compensation layer is mainly used for adjusting the spectrum peak position of emergent light of the display panel, and the second optical compensation layer is mainly used for adjusting the spectrum narrowing degree of the emergent light of the display panel, so that the display effect of the display panel is further improved.
In addition, the display panel includes a first region and a second region, the first electrode thickness of the first region is the same as the first electrode thickness of the second region, and the optical compensation layer is located in the first region and the second region. Therefore, the light loss of emergent rays and incident rays in the first area of the display panel can be reduced, the brightness of the emergent rays is improved, and the display effect and the imaging quality of the display panel are improved.
In addition, the display panel comprises a first area and a second area, and the light transmittance of the first area is greater than that of the second area; the thickness of the first electrode of the first area is smaller than that of the first electrode of the second area, and the optical compensation layer is located in the first area.
Correspondingly, the embodiment of the invention also provides electronic equipment, and the electronic equipment comprises the display panel.
Compared with the prior art, the technical scheme provided by the embodiment of the invention has the following advantages:
among the above-mentioned technical scheme, set up the optical compensation layer at one side of second electrode orientation luminescent layer, the optical compensation layer is used for increasing the optical path of optical microcavity among the display panel, make under the condition of the thickness attenuate of first electrode, still guarantee that the optical path of optical microcavity among the display panel accords with the demand, that is to say, when satisfying the high luminousness demand of display panel, make display panel emergent light spectrum peak position or spectrum narrowing degree accord with and predetermine the demand, thereby improve display panel's display effect, like improving display panel's color saturation. Specifically, after light emitted by the light-emitting layer passes through the optical microcavity, light energy is enhanced and a spectrum is narrowed; due to the arrangement of the optical compensation layer, the resonance wavelength of the optical microcavity can be increased, so that the adverse effect of the reduction of the thickness of the first electrode layer on the enhancement of light energy is reduced or counteracted, and the spectrum peak position of emergent light emitted by the light emitting side of the display panel can still meet the preset requirement; in addition, the arrangement of the optical compensation layer can also reduce or offset the adverse effect of the thickness reduction of the first electrode on the narrowed spectrum, so that the spectral width of the emergent light emitted by the light-emitting side of the display panel meets the preset requirement.
Drawings
One or more embodiments are illustrated by corresponding figures in the drawings, which are not to be construed as limiting the embodiments, unless expressly stated otherwise, and the drawings are not to scale.
Fig. 1 is a schematic cross-sectional view of a display panel according to an embodiment of the invention;
fig. 2 is a schematic cross-sectional view illustrating a display panel according to an embodiment of the invention;
fig. 3 is a schematic cross-sectional view of a display panel according to another embodiment of the invention;
fig. 4 is a schematic cross-sectional view of a display panel according to another embodiment of the invention;
fig. 5 is a schematic cross-sectional view of a display panel according to yet another embodiment of the invention;
fig. 6 is a schematic cross-sectional view illustrating a display panel according to another embodiment of the present invention;
fig. 7 is a schematic cross-sectional view of a display panel according to another embodiment of the invention;
fig. 8 is a schematic cross-sectional view of a display panel according to still another embodiment of the invention.
Detailed Description
With the emergence of Fingerprint-on-display (FOD) under the screen and camera requirements under the screen, higher requirements are put forward on the local light transmittance of the display panel. At present, in order to increase the local light transmittance of the display panel, a method of thinning the metal electrode in a local area is generally adopted to increase the light transmittance of the display panel in the thinned area. However, the method of thinning the metal electrode can improve the local light transmittance, but may cause adverse effects on the display effect of the thinned region, such as reduction of color purity of the thinned region; in addition, the display effect of the thinned area and the non-thinned area is different, and the overall performance of the display panel is affected.
The analysis finds that the reasons causing the problems include: the cathode and the anode of the display panel form an optical microcavity, and when the cathode of the thinning area is thinned, the spectrum of emergent light of the display panel of the thinning area is widened; in addition, as the cathode reflectivity changes, the optical path of the microcavity related to the cathode reflectivity also changes correspondingly, which causes the resonant wavelength of the microcavity to change, and further causes the spectral peak of the emergent light of the display panel in the thinned area to shift. No matter the emergent light spectrum is widened or the emergent light spectrum peak value is shifted, the display effect of the thinned area and the display effect of the non-thinned area are different.
In order to solve the above problem, an embodiment of the present invention provides a display panel, in which a second electrode, a light emitting layer, and a first electrode are sequentially stacked, and an optical compensation layer is located on a side of the second electrode facing the light emitting layer, the display panel has at least one optical microcavity, and the optical compensation layer is used to increase an optical length of the optical microcavity. The invention is beneficial to ensuring that the spectrum peak position or the spectrum narrowing degree of emergent light of the display panel meets the preset requirement and improving the display effect of the display panel.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
Fig. 1 is a schematic structural diagram of a first display panel according to an embodiment of the present invention.
Referring to fig. 1, the display panel in the present embodiment includes: a second electrode 11, a light-emitting layer 12, and a first electrode 13 which are stacked in this order; and the optical compensation layer 14 is positioned on one side of the second electrode 11, which faces the light-emitting layer 12, and is stacked with the light-emitting layer 12 and the first electrode 13, the light transmittance of the material of the optical compensation layer 14 is greater than that of the material of the first electrode 13, at least one optical microcavity is arranged in the display panel, and the optical compensation layer 14 is used for increasing the optical length of the optical microcavity.
Hereinafter, a display panel provided by an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, the display panel is an OLED display panel, and the light-emitting layer 12 includes an OLED light-emitting material. In other embodiments, the display panel may also be an LED display panel or an LCD display panel. In this embodiment, taking the emergent light direction of the display panel as the direction from the second electrode 11 to the first electrode 13 as an example, the display panel is of a top emission structure, and correspondingly, the first electrode 13 is a cathode, the second electrode 11 is an anode, the first electrode 13 is close to the emergent light side of the display panel, and the second electrode 11 is far away from the emergent light side of the display panel. It should be noted that the display panel may also be a bottom emission structure in other embodiments.
The first electrode 13, the light-emitting layer 12, and the second electrode 11 constitute an optical microcavity. The first electrode 13 provides a transflective film constituting an optical microcavity; the second electrode 11 provides a reflective film constituting an optical microcavity.
Specifically, the material of the first electrode 13 may include at least one of magnesium, aluminum, or silver. The second electrode 11 includes at least a first transparent electrode and a reflective electrode stacked together, where the reflective electrode is used as a reflective film of the optical microcavity, the transparent electrode may be indium tin oxide, and the reflective electrode may be silver. In addition, the second electrode 11 may further include a second transparent electrode, and the reflective electrode is located between the first transparent electrode and the second transparent electrode, and the material of the second transparent electrode may be indium tin oxide.
In this embodiment, the display panel includes a first region 1 and a second region 2, and the light transmittance of the first region 1 is greater than that of the second region 2.
The thickness of the first electrode 13 of the first region 1 is smaller than the thickness of the first electrode 13 of the second region 2. The thickness of the first electrode 13 of the first region 1 is smaller than that of the first electrode 13 of the second region 2, so that the light transmittance of the first electrode 13 of the first region 1 is greater than that of the first electrode 13 of the second region 2, and thus, the light transmittance of the first region 1 of the display panel can be improved, the light loss of emergent rays and incident rays in the first region 1 is reduced, and the display effect and the imaging quality of the display panel are improved.
In this embodiment, the top surface of the first electrode 13 of the first region 1 is flush with the top surface of the first electrode 13 of the second region 2. In other embodiments, the top surface of the first electrode in the first region and the top surface of the first electrode in the second region may have a height difference.
Because the luminousness of first region 1 is greater than the luminousness of second region 2, and the light incident loss of first region 1 is less than the light incident loss of second region 2 promptly, and one side that the second electrode 11 of first region 1 kept away from the luminescent layer can have components and parts such as fingerprint identification module or camera module, is favorable to reducing the light loss, and then improves fingerprint identification precision or image quality.
In this embodiment, the optical compensation layer 14 is located between the first electrode 13 and the second electrode 11, and the second electrode 11 and the first electrode 13 form an optical microcavity. The optical compensation layer 14 is arranged, so that the cavity length of the optical microcavity of the first region 1 is increased, the optical path of the optical microcavity of the first region 1 is further changed, the preset requirement of the emergent light spectrum peak position of the display panel is favorably met, and the realization effect of the display panel is improved.
It can be understood that the optical compensation layer 13 is beneficial to reducing the difference between the resonant wavelengths of the optical micro-cavities in the first region 1 and the second region 2, so as to improve the difference between the positions of the spectral peaks of the emergent light from the first region 1 and the second region 2, which is beneficial to improving the display effect of the display panel. Specifically, an initial optical microcavity is also formed between the first electrode 13 and the second electrode 11 in the second region 2, and since the thickness of the first electrode 13 of the second region 2 is greater than that of the first electrode 13 of the first region 1, if the optical compensation layer 13 is not disposed in the first region 1, the resonance wavelength of the initial optical microcavity in the second region 2 will be different from that of the optical microcavity in the first region 1, so that the positions of the spectral peaks of the outgoing light spectra of the second region 2 and the first region 1 are different, which affects the display uniformity.
The optical microcavity has a microcavity optical path L, where the microcavity optical path L refers to a path traveled by light emitted from the light-emitting layer 12 in the process of being reflected by the first electrode 13, being reflected by the second electrode 11, and returning to the starting position, and an equivalent path generated by reflection phase shifts of the first electrode 13 and the second electrode 11. Where the path of propagation is typically twice the sum of the products of the thickness (i.e., cavity length) and corresponding refractive indices of the layers through which the light travels.
In the present embodiment, the optical compensation layer 14 is located between the first electrode 13 and the light-emitting layer 12, and in the direction in which the second electrode 11 faces the first electrode 13, the sum of the thickness of the first electrode 13 of the first region 1 and the thickness of the optical compensation layer 14 is equal to the thickness of the first electrode 13 of the second region 2.
Since the light transmittance of the material of the optical compensation layer 14 is greater than that of the material of the first electrode 13, under the condition of the same total thickness, the light transmittance of the first region 1 containing the optical compensation layer 14 is greater than that of the second region 2 containing only the material of the first electrode 13, that is, the first region 1 of the display panel has smaller light exit loss and light incident loss; in addition, the surface of the first electrode 13 of the first region 1, which is far away from the light-emitting layer 12, is flush with the surface of the first electrode 13 of the second region 2, which is far away from the light-emitting layer, so that other structures in the display panel, which are located on the side of the first electrode 13, which is far away from the light-emitting layer 12, have better flatness.
It should be noted that the sum of the thickness of the first electrode 13 in the first region 1 and the thickness of the optical compensation layer 14 may also be greater than or less than the thickness of the first electrode 13 in the second region 2; the surface of the first electrode 13 of the first region 1 remote from the light-emitting layer 12 and the surface of the first electrode 13 of the second region 2 remote from the light-emitting layer may also be non-flush.
The difference between the thickness of the first electrode 13 in the second region 2 and the thickness of the first electrode 13 in the first region 1 is used as the thickness difference, and the difference between the thickness difference and the thickness of the optical compensation layer 14 is 0-10 nm. Therefore, the requirement that the light transmittance of the first area 1 is larger than that of the second area 2 is met, and meanwhile, the difference between the emergent light spectrum peak position of the first area 1 and the emergent light spectrum peak position of the second area 2 is small, and the display effect of the display panel is improved. Further, the difference between the thickness difference and the thickness of the optical compensation layer 14 may be 2nm, 4nm, 6nm, or 8nm, which is beneficial to further improving the light transmittance of the first region 1, further reducing the position difference of the peak of the emission spectrum between the first region 1 and the second region 2, and further improving the uniformity of the display color of the first region 1 and the second region 2.
In the present embodiment, the thickness of the first electrode 13 in the first region 1 is in the range of 5nm to 10nm, for example, 6nm, 7nm, 8nm, and 9 nm. Thus, the light transmittance of the first region 1 is improved, and the electrical performance of the first electrode 13 is not affected.
In other embodiments, the thickness of the first electrode in the first region may be the same as the thickness of the first electrode in the second region, and the optical compensation layer is located in the first region and the second region, that is, the light transmittances of the first region and the second region may be considered to be the same. Because the optical compensation layer is located in the first area and the second area, the setting of the optical compensation layer can simultaneously improve the emergent light intensity of the first area and the second area of the display panel, and ensure that the emergent light spectrum peak positions of the first area and the second area meet the preset requirement.
The thickness of the optical compensation layer in the first area and the thickness of the optical compensation layer in the second area can be equal or unequal, and the spectral peak position of emergent light of the display panel can be adjusted by adjusting the thickness of the optical compensation layer; the material of the first electrode of the first region may be the same as or different from the material of the first electrode of the second region.
In this embodiment, as shown in fig. 1, the optical compensation layer 14 is located between the light-emitting layer 12 and the first electrode 13, and the optical compensation layer 14 is located on a surface of the first electrode 13 facing the light-emitting layer 12. In other embodiments, as shown in fig. 2, the optical compensation layer 14 may also be located between the light-emitting layer 12 and the second electrode 11, and the optical compensation layer 14 covers the surface of the second electrode 11 facing the light-emitting layer 12.
It is understood that the display panel may further include: an electron transport layer, an electron injection layer, a hole transport layer, and a hole injection layer.
In this embodiment, the thickness of the first electrode 13 in the first region 1 is smaller than that of the first electrode 13 in the second region 2, so that the light transmittance of the first region 1 is better than that of the second region 2, and the display effect and the light incidence effect of the first region 1 are improved; and the optical compensation layer 14 is arranged in the first region 1, so that the position of the spectrum peak of the emergent light of the first region 1 can meet the preset requirement, and the display effect of the display panel can be improved.
Another embodiment of the present invention further provides a display panel, different from the previous embodiment, the optical compensation layer is located on a surface of the electron transport layer facing the light emitting layer or on a surface of the electron transport layer away from the light emitting layer; alternatively, the optical compensation layer is located on the surface of the hole transport layer facing the light emitting layer or on the surface of the hole transport layer away from the light emitting layer. Fig. 3 is a schematic cross-sectional structure diagram of a display panel according to another embodiment of the invention, and fig. 4 is a schematic cross-sectional structure diagram of a display panel according to another embodiment of the invention. The same or corresponding parts as or to the previous embodiment can be referred to the foregoing description, and detailed description thereof will not be repeated.
Referring to fig. 3, in the present embodiment, the display panel includes: a second electrode 31, a light-emitting layer 35, and a second electrode 38 which are stacked in this order; an electron transport layer 36 and a hole transport layer 34 respectively located on opposite sides of the light emitting layer 35 and stacked with the first electrode 38 and the second electrode 31; and an optical compensation layer 33, wherein the optical compensation layer 33 is positioned between the first electrode 38 and the second electrode 31. The optical compensation layer is positioned on the surface of the electron transport layer facing the light-emitting layer or on the surface of the electron transport layer far away from the light-emitting layer, and the material of the optical compensation layer is the same as that of the electron transport layer; or the optical compensation layer is positioned on the surface of the hole transport layer facing to the light-emitting layer or the surface of the hole transport layer far away from the light-emitting layer, and the material of the optical compensation layer is the same as that of the hole transport layer
Taking the first electrode 38 as a cathode and the second electrode 31 as an anode as an example.
In this embodiment, the electron transport layer 36 is located on the side of the light emitting layer 35 away from the second electrode 31.
In this embodiment, the optical compensation layer 33 is located between the electron transport layer 36 and the first electrode 38, and the material of the optical compensation layer 33 is the same as that of the electron transport layer 36, that is, the optical compensation layer 33 is located on the surface of the electron transport layer 36 facing the first electrode 38, and the optical compensation layer 33 is located on the surface of the electron transport layer 36 away from the light emitting layer 35. Thus, in the manufacturing process of the display panel, the optical compensation layer 33 can be formed by using the manufacturing process of the electron transport layer 36, which is beneficial to reducing the process steps and shortening the manufacturing period of the display panel.
It should be noted that, in other embodiments, the optical compensation layer may also be located on the surface of the electron transport layer facing the light emitting layer, and the material of the optical compensation layer is the same as that of the electron transport layer.
It is understood that in other embodiments, the optical compensation layer may be located on the surface of the hole transport layer facing the light emitting layer or on the surface of the hole transport layer away from the light emitting layer, and the material of the optical compensation layer is the same as that of the hole transport layer.
The optical compensation layer 33 may also have ultraviolet absorption properties, and can absorb ultraviolet light in the incident light from the outside. Therefore, the organic molecules in the light emitting layer 35 are prevented from being influenced by ultraviolet light, the performance of the organic molecules is guaranteed, and the display effect of the display panel is further guaranteed.
In other embodiments, as shown in fig. 4, the display panel may further include an electron injection layer 37 and a hole injection layer 32, where the electron injection layer 37 is located on the surface of the electron transport layer 36 away from the light emitting layer 35, and the hole injection layer 32 is located on the surface of the hole transport layer 34 away from the light emitting layer 35.
As shown in fig. 4, the optical compensation layer 33 is located on the surface of the hole injection layer 32 facing the light-emitting layer 35, and the material of the optical compensation layer 33 is the same as the material of the hole injection layer 32 or the material of the hole transport layer 34 in contact therewith. Therefore, the manufacturing method is beneficial to reducing the process steps and shortening the manufacturing period of the display panel.
In other embodiments, the optical compensation layer may also be located on a surface of the hole injection layer away from the light-emitting layer, and the material of the optical compensation layer is the same as that of the hole injection layer; or the optical compensation layer is positioned on the surface of the electron injection layer facing the light-emitting layer, and the material of the optical compensation layer is the same as that of the electron injection layer or the material of the electron transport layer; or the optical compensation layer is positioned on the surface of the electron injection layer far away from the light-emitting layer, and the material of the optical compensation layer is the same as that of the electron injection layer.
In this embodiment, the thickness of the first electrode 38 in the first area 1 is smaller than that of the first electrode 38 in the second area 2, which is beneficial to improving the light transmittance of the first area 1 of the display panel, and further improving the display effect and the light incidence effect of the first area 1 of the display panel; in addition, the optical compensation layer 33 is arranged between the first electrode 38 and the second electrode 31, which is beneficial to ensuring that the position of the spectrum peak of the emergent light in the first region 1 meets the preset requirement, and improving the display effect of the display panel.
It can be understood that the arrangement of the optical compensation layer 33 changes the microcavity optical path, which is beneficial to reducing or even eliminating the influence of the position shift of the spectrum peak of the outgoing light caused by the smaller thickness of the first electrode 38 in the first region 1, thereby improving the display effect of the display panel.
In addition, the difference between the thickness of the first electrode 38 in the first region 1 and the thickness of the optical compensation layer 33 in the second region 2 is within a predetermined range, so that the difference between the position of the spectral peak of the outgoing light in the first region 1 and the position of the spectral peak of the outgoing light in the second region 2 is small while the requirement that the light transmittance of the first region 1 is greater than that of the second region 2 is met, and the display effect of the display panel is improved.
In another embodiment of the present invention, a display panel is further provided, which is different from the foregoing embodiments, in this embodiment, the optical compensation layer is located on a side of the first electrode away from the light emitting layer. The following detailed description is made with reference to the accompanying drawings, and it should be noted that the same or corresponding features as those of the foregoing embodiments can be referred to the corresponding description of the foregoing embodiments, and will not be described below in detail.
Fig. 5 is a schematic cross-sectional structure diagram of a display panel according to yet another embodiment of the present invention, and fig. 6 is a schematic cross-sectional structure diagram of another display panel according to yet another embodiment of the present invention; fig. 7 is a schematic cross-sectional view of another display panel according to another embodiment of the invention.
Referring to fig. 5, the display panel provided in the present embodiment includes: a second electrode 51; a light-emitting layer 52; the first electrode 53; and an optical compensation layer 54 on a side of the first electrode 53 away from the second electrode 51.
In this embodiment, the optical compensation layer 54 is located on the side of the first electrode 53 away from the light-emitting layer 52. In this way, the optical compensation layer 54 and the first electrode 53 may form a composite cathode, the light reflectivity of the composite cathode is greater than that of the first electrode 53 in the first region 1, and the light transmittance of the composite cathode is greater than that of the first electrode 53 in the second region 2.
The first electrode 53 may form an optical microcavity with other structures of the display panel, such as a cover plate, and the optical compensation layer 54 may increase the cavity length of the optical microcavity. Specifically, the optical compensation layer 54 can increase the optical resonance effect of the first region 1 of the display panel, thereby reducing the spectral width of the outgoing light from the first region 1 and ensuring that the spectral narrowing degree of the outgoing light from the first region 1 is in accordance with the expectation. For example, the difference in the degree of narrowing of the spectrum between the first region 1 and the second region 2 can be reduced, and the display uniformity can be improved. In addition, the arrangement of the optical compensation layer 54 can avoid the problem of the spectral peak position offset of the emergent light in the first region 1 to a certain extent, and ensure that the spectral peak position of the emergent light meets the preset requirement.
Referring to fig. 6, in this embodiment, the display panel may further include: electrode coating 55, electrode coating 55 typically being a transparent optical material, electrode coating 55 may constitute a composite cathode with first electrode 53.
The refractive index of the material of the electrode cover layer 55 is greater than that of the first electrode 53. Therefore, the scattering angle of the light passing through the first electrode 53 can be reduced, the internal loss of the light can be reduced, more light can be emitted out of the display panel, and the luminous efficiency of the display panel can be improved.
The material of the electrode cover layer 25 includes a heteroarylamine organic compound, a triazine organic compound, and the like.
In this embodiment, the optical compensation layer 54 is located on the surface of the electrode covering layer 55 away from the light-emitting layer 53. In this way, the structure of the display panel in the first region 1 on the side of the first electrode 53 facing the light-emitting layer 52 is made the same as the structure of the display panel in the second region 2 on the side of the first electrode 55 facing the light-emitting layer 52. Therefore, the process difficulty of the display panel is favorably reduced, and the structural layout of the film layer between the first electrode 53 and the second electrode 51 is prevented from being changed, so that the display effect of the display panel is ensured.
In addition, in the embodiment, the material of the optical compensation layer 54 is the same as that of the electrode covering layer 55, so that the process steps are reduced, and the manufacturing period of the display panel is shortened; in other embodiments, the material of the optical compensation layer is different from the material of the electrode capping layer.
It should be noted that, in other embodiments, as shown in fig. 7, the optical compensation layer 54 may also be located between the electrode covering layer 55 and the first electrode 53, that is, the optical compensation layer 54 is located on the surface of the electrode covering layer 55 facing the first electrode 53, and the material of the optical compensation layer 54 is the same as that of the electrode covering layer 55.
In this embodiment, the optical compensation layer 54 is located on the side of the first electrode 53 of the first area 1 away from the light emitting layer 52, the optical compensation layer 54 and the first electrode 53 form a composite electrode, and the light reflectivity of the composite cathode is greater than the light reflectivity of the first electrode 53 of the first area 1, so that the difference between the spectrum width of the outgoing light and the position of the spectrum peak of the outgoing light of the first area 1 and the second area 2 is small, thereby improving the display uniformity of the outgoing light of the display panel.
In addition, the structure of the display panel located on the side of the first electrode 56 facing the light emitting layer 53 in the first region 1 is the same as the structure of the display panel located on the side of the first electrode 56 facing the light emitting layer 52 in the second region 2, which is beneficial to reducing the process difficulty of the display panel, and is beneficial to avoiding unexpected influence on the performance of the display panel caused by the arrangement of the optical compensation layer 54, thereby ensuring the display effect of the display panel.
Another embodiment of the present invention further provides a display panel, different from the foregoing embodiments, in this embodiment, the optical compensation layer includes: the first optical compensation layer is positioned on one side of the first electrode, which is far away from the second electrode. The following detailed description is made with reference to the accompanying drawings, and it should be noted that the same or corresponding features as those of the foregoing embodiments can be referred to the corresponding description of the foregoing embodiments, and will not be described below in detail.
Fig. 8 is a schematic cross-sectional view illustrating a display panel according to still another embodiment of the invention.
Referring to fig. 8, the present embodiment provides a display panel including: a second electrode 71; a light-emitting layer 72; a first electrode 73; a first optical compensation layer 741 between the first electrode 73 and the second electrode 71; and a second optical compensation layer 742 on a side of the first electrode 73 away from the second electrode 73.
The second optical compensation layer 742 and the first optical compensation layer 741 together constitute an optical compensation layer. The first optical compensation layer 741 is provided to change the optical path length of the optical microcavity formed by the first electrode 73 and the second electrode 71, thereby changing the spectral peak position of the light emitted from the first region 1; the second optical compensation layer 742 may form a composite cathode with the first electrode 73, and the light reflectivity of the composite cathode is greater than that of the first electrode 73 in the first region, so as to change the spectral peak position of the light emitted from the first region 1 and narrow the spectral width of the light emitted from the first region 1.
The thickness of the first optical compensation layer 741 may be the same as or different from the thickness of the second optical compensation layer 742; the material of the first optical compensation layer 741 and the material of the second optical compensation layer 742 may be the same or different.
In this embodiment, the first optical compensation layer 741 is provided mainly to reduce the difference in the positions of the spectral peaks of the outgoing light in the first region 1 and the second region 3; the second optical compensation layer 742 is mainly provided to reduce the difference in the spectral widths of the outgoing light from the first region 1 and the second region 2, that is, to reduce the difference in the degrees of narrowing of the outgoing light spectra from the first region 1 and the second region 2. Therefore, by providing the first optical compensation layer 741 and the second optical compensation layer 742, the position of the spectrum peak of the outgoing light and the degree of narrowing of the spectrum can be adjusted according to actual needs, which is beneficial to further improving the display effect of the display panel.
Correspondingly, the invention also provides electronic equipment which comprises the display panel.
The first area has high light transmittance so as to meet the requirement of a lighting part in the electronic equipment on high light transmittance of the display panel; and the optical compensation layer is arranged in the first area, so that the spectrum peak position and the spectrum narrowing degree of emergent light in the first area are changed, the display effect of the display panel is improved, and the performance of the electronic equipment is improved.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A display panel, comprising:
a second electrode, a light-emitting layer, and a first electrode which are stacked in this order;
the optical compensation layer is positioned on one side, facing the light emitting layer, of the second electrode and is arranged in a laminated mode with the light emitting layer and the first electrode, the light transmittance of the material of the optical compensation layer is larger than that of the material of the first electrode, at least one optical microcavity is arranged in the display panel, and the optical compensation layer is used for increasing the optical length of the optical microcavity;
the display panel comprises a first area and a second area, and the light transmittance of the first area is greater than that of the second area; the thickness of the first electrode of the first area is smaller than that of the first electrode of the second area, and the optical compensation layer is located in the first area and not located in the second area.
2. The display panel according to claim 1, wherein the optical compensation layer is located between the first electrode and the second electrode, the second electrode and the first electrode forming the optical microcavity, and the optical compensation layer is configured to increase an optical length of the optical microcavity.
3. The display panel according to claim 2, further comprising: the electron transport layer and the hole transport layer are respectively positioned on two opposite sides of the light-emitting layer and are stacked with the first electrode and the second electrode; the optical compensation layer is positioned on the surface of the electron transport layer facing the light-emitting layer or on the surface of the electron transport layer far away from the light-emitting layer, and the material of the optical compensation layer is the same as that of the electron transport layer; or the optical compensation layer is positioned on the surface of the hole transport layer facing the light-emitting layer or the surface of the hole transport layer far away from the light-emitting layer, and the material of the optical compensation layer is the same as that of the hole transport layer.
4. The display panel according to claim 3, further comprising: the electron injection layer is positioned on the surface of the electron transport layer far away from the light-emitting layer, and the hole injection layer is positioned on the surface of the hole transport layer far away from the light-emitting layer; the optical compensation layer is positioned on the surface of the electron injection layer far away from the light-emitting layer or on the surface of the electron injection layer facing the light-emitting layer, and the material of the optical compensation layer is the same as that of the electron injection layer; or the optical compensation layer is positioned on the surface of the hole injection layer far away from the light-emitting layer or on the surface of the hole injection layer facing the light-emitting layer, and the material of the optical compensation layer is the same as that of the hole injection layer.
5. The display panel according to claim 1, wherein the optical compensation layer is located on a side of the first electrode away from the second electrode.
6. The display panel according to claim 5, further comprising: the electrode covering layer is positioned on one side, far away from the light emitting layer, of the first electrode, and the optical compensation layer is positioned between the electrode covering layer and the first electrode, or the optical compensation layer is positioned on the surface, far away from the first electrode, of the electrode covering layer.
7. The display panel according to claim 6, wherein a material of the optical compensation layer is the same as a material of the electrode cover layer.
8. The display panel according to any one of claims 1 to 6, wherein the optical compensation layer comprises: a first optical compensation layer between the first electrode and the second electrode; a second optical compensation layer on a side of the first electrode away from the second electrode.
9. An electronic device, comprising: the display panel of any one of claims 1 to 8.
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| CA3002752A1 (en) | 2015-10-26 | 2017-05-04 | Oti Lumionics Inc. | Method for patterning a coating on a surface and device including a patterned coating |
| CN110785867B (en) | 2017-04-26 | 2023-05-02 | Oti照明公司 | Method for patterning a surface coating and apparatus comprising a patterned coating |
| US11043636B2 (en) | 2017-05-17 | 2021-06-22 | Oti Lumionics Inc. | Method for selectively depositing a conductive coating over a patterning coating and device including a conductive coating |
| US11751415B2 (en) | 2018-02-02 | 2023-09-05 | Oti Lumionics Inc. | Materials for forming a nucleation-inhibiting coating and devices incorporating same |
| US11730012B2 (en) | 2019-03-07 | 2023-08-15 | Oti Lumionics Inc. | Materials for forming a nucleation-inhibiting coating and devices incorporating same |
| US11832473B2 (en) | 2019-06-26 | 2023-11-28 | Oti Lumionics Inc. | Optoelectronic device including light transmissive regions, with light diffraction characteristics |
| CN117500334A (en) | 2019-06-26 | 2024-02-02 | Oti照明公司 | Optoelectronic device comprising a light transmissive region having light diffraction features |
| US20220278299A1 (en) | 2019-08-09 | 2022-09-01 | Oti Lumionics Inc. | Opto-electronic device including an auxiliary electrode and a partition |
| JP2023553379A (en) | 2020-12-07 | 2023-12-21 | オーティーアイ ルミオニクス インコーポレーテッド | Patterning of conductive deposited layer using nucleation suppressing coating and base metal coating |
| CN113193018B (en) | 2021-04-21 | 2022-11-08 | 武汉华星光电技术有限公司 | OLED display panel and OLED display device |
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