CN109873087B - Pixel structure and display panel - Google Patents
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- CN109873087B CN109873087B CN201711250382.3A CN201711250382A CN109873087B CN 109873087 B CN109873087 B CN 109873087B CN 201711250382 A CN201711250382 A CN 201711250382A CN 109873087 B CN109873087 B CN 109873087B
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Abstract
The invention discloses a pixel structure and a display panel, wherein the pixel structure comprises a plurality of sub-pixels and at least a first sub-pixel; the first sub-pixel comprises a first electrode, a first optical cavity with a laminated structure and a second electrode with the polarity opposite to that of the first electrode which are sequentially stacked; the first optical cavity includes a light emitting layer; the first optical cavity further includes a first adjustment layer, and a material energy level of the first adjustment layer is determined according to a relationship between a lighting voltage of the first sub-pixel and material energy levels of two adjacent layers of the first adjustment layer. The injection barrier of the current carrier is adjusted by changing the material energy level relation between the adjusting layer and the two adjacent layers, so that the adjustment of the lighting voltage of the sub-pixel is realized. Since the energy level and the mobility of the semiconductor material can be adjusted independently to a certain extent, the driving voltage of the sub-pixel is not affected.
Description
Technical Field
The invention relates to the technical field of display panels, in particular to a pixel structure and a display panel.
Background
Low gray scale color shift is a common problem in display panels. In particular, in an Organic Light-Emitting Diode (OLED) device, the injection layer and the transport layer materials are conductive in both the lateral and longitudinal directions, and particularly, the injection layer has high carrier mobility. Fig. 1 is a schematic diagram of a conventional RGB pixel structure, as shown in fig. 1, because there is a difference in the lighting voltages of the three sub-pixels, when the sub-pixel B with a high lighting voltage is turned on, as shown by a solid line and a dotted line in fig. 1, when holes flow to the blue light emitting layer, a part of the holes are laterally conducted through the hole injection layer and the hole transport layer, and the sub-pixel G and the sub-pixel R with a low lighting voltage can be slightly turned on. This causes the display panel to have a certain degree of color distortion at lower gray levels, which is called low gray level color shift.
In order to avoid the occurrence of low gray scale color shift, there are methods in the prior art, such as reducing the doping ratio of the dopant in the hole injection layer to reduce the electron mobility, and reducing the thickness of the hole injection layer to reduce the lateral conductivity of the hole injection layer, however, no matter reducing the doping ratio of the dopant in the hole injection layer or reducing the thickness of the hole injection layer, although the problem of low gray scale color shift can be solved, the driving voltage of the sub-pixel is increased, and the working performance of the sub-pixel is affected.
Disclosure of Invention
The invention provides a pixel structure and a display panel, which are used for improving low-gray-scale color cast under the condition of not influencing driving voltage.
The embodiment of the invention provides a pixel structure, which comprises a plurality of sub-pixels, at least a first sub-pixel, a second sub-pixel and a third sub-pixel, wherein the plurality of sub-pixels at least comprise a first sub-pixel; the first sub-pixel comprises a first electrode, a first optical cavity with a laminated structure and a second electrode with the polarity opposite to that of the first electrode which are sequentially stacked; the first optical cavity comprises a light-emitting layer which is used for emitting light under the action of the first electrode and the second electrode; the first optical cavity further comprises a first adjusting layer, and the material energy level of the first adjusting layer is determined according to the relation between the lighting voltage of the first sub-pixel and the material energy levels of two adjacent layers of the first adjusting layer.
Optionally, the display device further comprises a second sub-pixel;
for the pixel structure of which the original lighting voltage of the first sub-pixel is higher than that of the second sub-pixel, the material energy level of the first adjusting layer is positioned between the material energy levels of the two adjacent layers; the original lighting voltage is the lighting voltage of the first sub-pixel which does not comprise the first adjusting layer and has the same optical cavity length.
Optionally, the first optical cavity further comprises a first injection layer in contact with the first electrode, and a second injection layer in contact with the second electrode;
when the first adjusting layer is positioned on one side of the light-emitting layer close to the first electrode, the magnitude relation of the material energy levels of two adjacent layers of the first adjusting layer is consistent with the magnitude relation of the material energy levels between the light-emitting layer and the first injection layer, and the magnitude relation of the material energy levels of the two adjacent layers is the magnitude relation of the material energy levels between one layer close to the light-emitting layer and one layer close to the first electrode;
when the first adjusting layer is positioned on one side of the light-emitting layer close to the second electrode, the magnitude relation of the material energy levels of two adjacent layers of the first adjusting layer is consistent with the magnitude relation of the material energy levels between the light-emitting layer and the second injection layer, and the magnitude relation of the material energy levels of the two adjacent layers is the magnitude relation of the material energy levels between one layer close to the light-emitting layer and one layer close to the second electrode in the two adjacent layers.
Optionally, the first optical cavity further comprises a first transport layer between the first injection layer and the light emitting layer;
when the first adjusting layer is positioned on one side of the light emitting layer close to the first electrode, the carrier mobility of the first adjusting layer is not less than that of the first transmission layer.
Optionally, the first optical cavity further comprises a second transport layer located between the second injection layer and the light emitting layer;
when the first adjusting layer is positioned on one side of the light emitting layer close to the second electrode, the carrier mobility of the first adjusting layer is not less than that of the second transmission layer.
Optionally, a potential barrier between two adjacent first adjustment layers is larger than a potential barrier between any two adjacent first adjustment layers in the first optical cavity.
Optionally, the display device further comprises a second sub-pixel;
for the pixel structure of which the original lighting voltage of the first sub-pixel is lower than that of the second sub-pixel, the material energy level of the first adjusting layer is higher than the maximum value of the material energy levels of the two adjacent layers.
Optionally, the cavity length of the first optical cavity is an original cavity length of the first optical cavity; the original cavity length is the cavity length of the optical cavity excluding the adjustment layer.
Optionally, the display device further comprises a second sub-pixel;
the second sub-pixel comprises a second adjusting layer, and the material energy level of the second adjusting layer is determined according to the relation between the lighting voltage of the second sub-pixel and the material energy levels of two adjacent layers of the second adjusting layer.
An embodiment of the invention provides a display panel, including the pixel structure as described in any one of the above.
In summary, the embodiments of the present invention provide a pixel structure and a display panel, wherein the pixel structure includes a plurality of sub-pixels, at least a first sub-pixel; the first sub-pixel comprises a first electrode, a first optical cavity with a laminated structure and a second electrode with the polarity opposite to that of the first electrode which are sequentially stacked; the first optical cavity comprises a light-emitting layer which is used for emitting light under the action of the first electrode and the second electrode; the first optical cavity further includes a first adjustment layer, and a material energy level of the first adjustment layer is determined according to a relationship between a lighting voltage of the first sub-pixel and material energy levels of two adjacent layers of the first adjustment layer. Because the lighting voltage of the sub-pixel is mainly influenced by the injection condition of carriers between interfaces of each layer in the optical cavity, and the injection condition of the carriers between the interfaces of each layer is influenced by potential barriers between the layers, the injection potential barriers of the carriers can be adjusted by changing the energy level relation between the adjusting layer and the two adjacent layers, and the adjustment of the lighting voltage of the sub-pixel is realized. For the driving voltage, the driving voltage is mainly influenced by the carrier mobility of each layer in the optical cavity, and because the energy level and the mobility of the semiconductor material can be independently adjusted to a certain degree, the influence on the driving voltage of the sub-pixel can be reduced by reasonably selecting the material of the adjusting layer.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic diagram of a conventional RGB pixel structure;
fig. 2 is a schematic diagram of a pixel structure according to an embodiment of the invention;
fig. 3 is a corresponding relationship between a sub-pixel 1 and an original sub-pixel 1 according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating the relationship between the energy levels of the first adjustment layer and the adjacent two layers according to the embodiment of the present invention;
fig. 5 is a schematic structural diagram of a sub-pixel 1 according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating the original first optical cavity 12a and its material level structure for a particular case according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a sub-pixel 1 according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 2 is a schematic view of a pixel structure according to an embodiment of the present invention, and as shown in fig. 2, the pixel structure includes a sub-pixel 1. In fig. 2, the sub-pixel 1 is a first sub-pixel, and includes a first electrode 11, a first optical cavity 12, and a second electrode 13 having a polarity opposite to that of the first electrode 11, which are sequentially stacked. The first optical cavity 12 is a layered structure, the first optical cavity 12 includes a light-emitting layer 121, and the light-emitting layer 121 is configured to emit light under the action of the first electrode 11 and the second electrode 13; the first optical cavity 12 further includes a first adjustment layer 122, and a material energy level of the first adjustment layer 122 is determined according to a relationship between a lighting voltage of the sub-pixel 1 and material energy levels of two adjacent layers of the first adjustment layer 122, for adjusting the lighting voltage of the sub-pixel 1.
It should be understood that, in practical applications, the pixel structure may also include three, four, etc. sub-pixels, and the light emitting layer of each sub-pixel emits light with different colors, such as a red-green-blue (RGB) three-color pixel structure, and the first sub-pixel in the embodiment of the present invention may be any one of the RGB three sub-pixels related to the low gray scale color shift problem, for example, in the case that the low gray scale separately illuminates the blue sub-pixel due to an excessively high illumination voltage of the blue sub-pixel, the red sub-pixel may also emit light slightly, and in this case, the first sub-pixel may be a blue sub-pixel or a red sub-pixel.
In the embodiment of the invention, the first adjustment layer 122 can adjust the lighting voltage of the sub-pixel 1 up or down. As shown in fig. 2, the pixel structure further includes a second sub-pixel, pixel 2, which has a low gray scale color shift problem with the sub-pixel 1. The sub-pixel 2 comprises a third electrode 21, a second optical cavity 22 and a fourth electrode 23 which are sequentially stacked, wherein the second optical cavity 22 comprises a second light-emitting layer 221 for emitting light under the action of the third electrode 21 and the fourth electrode 23. The second optical cavity 22 may further include a second adjustment layer (not shown in fig. 2) to improve the low gray scale color shift of the pixel structure in cooperation with the first adjustment layer.
For a pixel structure in which the original lighting voltage of the sub-pixel 1 is higher than that of the sub-pixel 2, the material energy level of the first adjustment layer 122 is located between the material energy levels of the two adjacent layers; the original lighting voltage is the lighting voltage of the sub-pixel that does not include the first adjustment layer 122 and has the same optical cavity length. Referring to fig. 3, for the corresponding relationship between the sub-pixel 1 and the original sub-pixel 1 provided in the embodiment of the present invention, the first electrode 11 and the second electrode 13 are the same between the sub-pixel 1 and the original sub-pixel 1, and the first optical cavity 12 and the original first optical cavity 12a have the same length, except that the first adjustment layer 122 is not disposed in the original first optical cavity 12 a. In the embodiment of the present invention, the original lighting voltage of the sub-pixel 1 is the lighting voltage of the original sub-pixel 1 in fig. 3. In the embodiment of the present invention, the sub-pixel 2 may include the second adjustment layer, or may not include the second adjustment layer, and for the sub-pixel 2 having the second adjustment layer, the original lighting voltage and the corresponding relationship of the pixel are the same as the sub-pixel 1, while for the sub-pixel 2 not having the second adjustment layer, the original lighting voltage is the lighting voltage of itself.
When the original lighting voltage of the sub-pixel 1 is higher than the original lighting voltage of the sub-pixel 2, the sub-pixel 1 lights the sub-pixel 1 alone in a low gray scale and at the same time makes the sub-pixel 2 emit light slightly, at this time, the lighting voltage of the sub-pixel 1 can be reduced by the first adjusting layer 122, and the material energy level of the first adjusting layer 122 is located between the material energy levels of the two adjacent layers, as shown in fig. 4, a schematic diagram of the material energy level relationship between the first adjusting layer and the two adjacent layers provided for the embodiment of the present invention is shown, wherein the layer a and the layer B are two adjacent layers of the first adjusting layer 122, please refer to fig. 3, and the layer a and the layer B can be any two adjacent layers in the original first optical cavity 12 a. In the original sub-pixel 1, a higher injection barrier is formed between the layer a and the layer B, and after the first adjusting layer 122 is added, the material energy level of the first adjusting layer 122 becomes the transition of the injection barrier between the layer a and the layer B, so that the injection barrier of carriers between interfaces is reduced, and the lighting voltage is further reduced.
Optionally, as shown in fig. 5, which is a schematic structural diagram of a sub-pixel 1 according to an embodiment of the present invention, in fig. 5, the first optical cavity 12 further includes a first injection layer 123 in contact with the first electrode 11, and a second injection layer 124 in contact with the second electrode 13. In general, the first injection layer 123 and the second injection layer 124 have high mobility, and the material energy levels of the two have the same magnitude relationship with the material energy level of the light emitting layer 121. Taking the first injection layer 123 as an example, there may be other layers separated from the light-emitting layer 121, and in a normal case, the material energy levels of the layers from the first injection layer 123 to the light-emitting layer 121 may be sequentially increased or decreased, but in some special cases, it may occur that the material energy levels of some layers violate the increasing or decreasing rule.
Optionally, when the first adjusting layer 122 is located on the side of the light emitting layer 121 close to the first electrode 11, the magnitude relationship of the material energy levels of two adjacent layers of the first adjusting layer 122 is consistent with the magnitude relationship of the material energy levels between the light emitting layer 121 and the first injection layer 123, and the magnitude relationship of the material energy levels of two adjacent layers is the magnitude relationship of the material energy levels between one layer close to the light emitting layer 121 and one layer close to the first electrode 11 in the two adjacent layers. Fig. 6 is a schematic diagram of the original first optical cavity 12a and its material energy level structure under a special condition provided by the embodiment of the invention, as shown in fig. 6, the original first optical cavity 12a of the original sub-pixel 1 includes a first injection layer 123, a layer a, a light emitting layer 121, a layer b, and a second injection layer 124, wherein the layer a is another layer located between the first injection layer 123 and the light emitting layer 121, and the layer b is another layer located between the second injection layer 124 and the light emitting layer 121, corresponding to this, fig. 6 also shows the material energy level relationship among the first injection layer 123, the layer a, and the light emitting layer 121, as shown in fig. 6, the material energy level of the layer a is smaller than (usually, the energy level of each sub-pixel is negative, and the absolute value of the energy level of the layer a is larger than the absolute values of the first injection layer 123 and the light emitting layer 121), and as can be seen that the first injection layer 123, the second injection layer a, and the material energy level of the light emitting layer 121 are smaller than the first injection layer, The material levels between the layer a and the light emitting layer 121 do not form a relationship of sequentially increasing, in this case, in the first optical cavity 12 of the sub-pixel 1 corresponding to the original sub-pixel 1, the first adjusting layer 122 is disposed between the layer a and the first injection layer 123, and the material level thereof is between the material levels of the layer a and the first injection layer 123, and the first adjusting layer 122 is not disposed between the layer a and the light emitting layer 121. This is because, in the material level structure shown in fig. 6, carriers flow from the first injection layer 123 to the light-emitting layer 121, and in this direction, the potential barrier between the layer a and the light-emitting layer 121 does not adversely affect the carrier interface injection condition, and therefore, the first adjustment layer 122 disposed between the layer a and the light-emitting layer 121 does not reduce the lighting voltage of the sub-pixel 1.
For the same reason, when the first adjustment layer 122 is located on the side of the light-emitting layer 121 close to the second electrode 13, the magnitude relationship of the material energy levels of the two adjacent layers of the first adjustment layer 122 is consistent with the magnitude relationship of the material energy levels between the light-emitting layer 121 and the second injection layer 124, and the magnitude relationship of the material energy levels of the two adjacent layers is the magnitude relationship of the material energy levels between one layer close to the light-emitting layer 121 and one layer close to the second electrode 13.
Optionally, the first optical cavity further comprises a first transport layer located between the first injection layer and the light emitting layer. Fig. 7 is a schematic structural diagram of a sub-pixel 1 according to an embodiment of the present invention, and as shown in fig. 7, the optical cavity 12 of the sub-pixel 1 further includes a first transport layer 125 located between the first injection layer 123 and the light-emitting layer 121. When the first adjustment layer 122 is located on the side of the light-emitting layer 121 close to the first electrode 11, the carrier mobility of the first adjustment layer 122 is not less than that of the first transport layer 125. Further, the sum of the thickness of the first adjustment layer 122 in the first optical cavity 12 and the thickness of the first transmission layer 125 should be equal to the original thickness of the first transmission layer in the first optical cavity 12 a. With the remaining layers unchanged, it can be ensured that the first optical cavity 12 has the same length as the original first optical cavity 12a, thereby ensuring the tuning effect of the first optical cavity 12 on the light-emitting parameters of the light-emitting layer 121. In the embodiment of the present invention, the cavity length of the first optical cavity 12 is the original cavity length of the first optical cavity 12, i.e., the cavity length of the original first optical cavity 12 a. Meanwhile, the carrier mobility of the first adjusting layer 122 is not less than that of the first transmission layer 125, so that the first optical cavity 12 has the carrier mobility not less than that of the original first optical cavity 12a, and the improvement of the driving voltage of the sub-pixel 1 caused by the introduction of the first adjusting layer 122 is avoided. For the same reason, optionally, as shown in fig. 7, the first optical cavity 12 further includes a second transport layer 125 between the second injection layer 124 and the light emitting layer 121. When the first adjustment layer 122 is located on the side of the light-emitting layer 121 close to the second electrode 13, the carrier mobility of the first adjustment layer 122 is not less than that of the second transport layer.
Optionally, the potential barrier between two adjacent first adjustment layers 122 is larger than the potential barrier between any two adjacent first optical cavities 12. That is, in the original first optical cavity 12a corresponding to the first optical cavity 12, the first adjustment layer 122 needs to be disposed between the two layers with the largest potential barrier to reduce the lighting voltage of the sub-pixel 1. Of course, an adjustment layer may be provided between other layers at the same time, and the lighting voltage of the sub-pixel 1 may be reduced together with the first adjustment layer 122.
In the above embodiment, for the reason that the original lighting voltage of the sub-pixel 1 is higher than that of the sub-pixel 2, the sub-pixel 1 reduces the lighting voltage through the first adjustment layer 122 to improve the problem of low gray scale color shift between the sub-pixel 1 and the sub-pixel 2. It is easy to think that the original lighting voltage of the sub-pixel 1 is lower than that of the sub-pixel 2, which causes the problem of low gray scale color shift between the sub-pixels 1 and 2, and in this case, the problem of low gray scale color shift can be solved by increasing the lighting voltage of the sub-pixel 1. Alternatively, for a pixel structure in which the original lighting voltage of the sub-pixel 1 is lower than that of the sub-pixel 2, the material energy level of the first adjustment layer 122 is higher than the maximum value of the material energy levels of the two adjacent layers. Taking the sub-pixel 1 shown in fig. 7 as an example, assuming that the energy levels of the materials between the first injection layer 123, the first transport layer 125 and the light-emitting layer 121 are sequentially increased, and the first adjustment layer 122 is disposed between the first transport layer 125 and the light-emitting layer 121, the energy level of the material of the first adjustment layer 122 needs to be greater than the energy level of the material of the light-emitting layer 121. The introduction of the first adjustment layer 122 increases the interface injection barrier of carriers in the first transfer layer 125, as viewed in the carrier flow direction, thereby increasing the lighting voltage of the subpixel 1.
Optionally, in a specific implementation process, not only the first adjustment layer 122 may be disposed in the sub-pixel 1, but also the second adjustment layer may be disposed in the sub-pixel 2, and a material energy level of the second adjustment layer is determined according to a relationship between a lighting voltage of the second sub-pixel and a material energy level of two adjacent layers of the second adjustment layer. Specifically, the lighting voltage of the sub-pixel 1 may be lowered by the first adjustment layer 122 while the lighting voltage of the sub-pixel 2 is raised by the second adjustment layer, or the lighting voltage of the sub-pixel 1 may be raised by the first adjustment layer 122 while the lighting voltage of the sub-pixel 2 is lowered by the second adjustment layer.
In summary, the present invention provides a pixel structure, which includes a plurality of sub-pixels, at least a first sub-pixel; the first sub-pixel comprises a first electrode, a first optical cavity with a laminated structure and a second electrode with the polarity opposite to that of the first electrode which are sequentially stacked; the first optical cavity comprises a light-emitting layer which is used for emitting light under the action of the first electrode and the second electrode; the first optical cavity further includes a first adjustment layer, and a material energy level of the first adjustment layer is determined according to a relationship between a lighting voltage of the first sub-pixel and material energy levels of two adjacent layers of the first adjustment layer. Because the lighting voltage of the sub-pixel is mainly influenced by the injection condition of carriers between interfaces of each layer in the optical cavity, and the injection condition of the carriers between the interfaces of each layer is influenced by potential barriers between the layers, the injection potential barriers of the carriers can be adjusted by changing the energy level relation between the adjusting layer and the two adjacent layers, and the adjustment of the lighting voltage of the sub-pixel is realized. For the driving voltage, the driving voltage is mainly influenced by the carrier mobility of each layer in the optical cavity, and because the energy level and the mobility of the semiconductor material can be independently adjusted to a certain degree, the influence on the driving voltage of the sub-pixel can be reduced by reasonably selecting the material of the adjusting layer.
Based on the same technical concept, the embodiment of the invention also provides a display panel. The display panel comprises the pixel structure provided by any one of the embodiments, and when the display panel works, the pixel structure provided by the embodiment of the invention is controlled by the driving circuit to emit light, so that image display is realized.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A pixel structure comprising a plurality of sub-pixels,
the liquid crystal display device at least comprises a first sub-pixel, wherein the first sub-pixel comprises a first electrode, a first optical cavity with a laminated structure and a second electrode with the polarity opposite to that of the first electrode which are sequentially arranged in a laminated mode; the first optical cavity comprises a light-emitting layer which is used for emitting light under the action of the first electrode and the second electrode; the first optical cavity further comprises a first tuning layer;
the pixel structure further comprises a second sub-pixel;
for the pixel structure of which the original lighting voltage of the first sub-pixel is higher than that of the second sub-pixel, the material energy level of the first adjusting layer is positioned between the material energy levels of the two adjacent layers; the original lighting voltage of the first sub-pixel is the lighting voltage of the first sub-pixel which does not comprise the first adjusting layer and has the same optical cavity length as that of the first optical cavity; the optical cavity does not include the first adjustment layer.
2. The pixel structure of claim 1, wherein said first optical cavity further comprises a first injection layer in contact with said first electrode, and a second injection layer in contact with said second electrode;
when the first adjusting layer is positioned on one side of the light-emitting layer close to the first electrode, the magnitude relation of the material energy levels of two adjacent layers of the first adjusting layer is consistent with the magnitude relation of the material energy levels between the light-emitting layer and the first injection layer, and the magnitude relation of the material energy levels of the two adjacent layers is the magnitude relation of the material energy levels between one layer close to the light-emitting layer and one layer close to the first electrode;
when the first adjusting layer is positioned on one side of the light-emitting layer close to the second electrode, the magnitude relation of the material energy levels of two adjacent layers of the first adjusting layer is consistent with the magnitude relation of the material energy levels between the light-emitting layer and the second injection layer, and the magnitude relation of the material energy levels of the two adjacent layers is the magnitude relation of the material energy levels between one layer close to the light-emitting layer and one layer close to the second electrode in the two adjacent layers.
3. The pixel structure of claim 2, wherein the first optical cavity further comprises a first transport layer between the first injection layer and the light emitting layer;
when the first adjusting layer is positioned on one side of the light emitting layer close to the first electrode, the carrier mobility of the first adjusting layer is not less than that of the first transmission layer.
4. The pixel structure of claim 2, wherein said first optical cavity further comprises a second transport layer between said second injection layer and said light emitting layer;
when the first adjusting layer is positioned on one side of the light emitting layer close to the second electrode, the carrier mobility of the first adjusting layer is not less than that of the second transmission layer.
5. The pixel structure of claim 1, wherein a potential barrier between two adjacent layers of the first adjustment layer is greater than a potential barrier between any adjacent two layers of the first optical cavity.
6. The pixel structure according to any one of claims 1 to 5, wherein the second sub-pixel includes a second adjustment layer, and a material energy level of the second adjustment layer is determined according to a relationship between a lighting voltage of the second sub-pixel and material energy levels of two adjacent layers of the second adjustment layer.
7. A pixel structure comprising a plurality of sub-pixels,
the liquid crystal display device at least comprises a first sub-pixel, wherein the first sub-pixel comprises a first electrode, a first optical cavity with a laminated structure and a second electrode with the polarity opposite to that of the first electrode which are sequentially arranged in a laminated mode; the first optical cavity comprises a light-emitting layer which is used for emitting light under the action of the first electrode and the second electrode; the first optical cavity further comprises a first tuning layer;
the pixel structure further comprises a second sub-pixel;
for the pixel structure of which the original lighting voltage of the first sub-pixel is lower than that of the second sub-pixel, the material energy level of the first adjusting layer is higher than the maximum value of the material energy levels of the two adjacent layers; the original lighting voltage of the first sub-pixel is the lighting voltage of the first sub-pixel which does not comprise the first adjusting layer and has the same optical cavity length as that of the first optical cavity; the optical cavity does not include the first adjustment layer.
8. The pixel structure of claim 7, wherein the cavity length of the first optical cavity is an original cavity length of the first optical cavity; the original cavity length is the cavity length of the optical cavity excluding the adjustment layer.
9. The pixel structure according to any one of claims 7 to 8, further comprising a second sub-pixel;
the second sub-pixel comprises a second adjusting layer, and the material energy level of the second adjusting layer is determined according to the relation between the lighting voltage of the second sub-pixel and the material energy levels of two adjacent layers of the second adjusting layer.
10. A display panel comprising a pixel structure according to any one of claims 1 to 9.
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| CN106920895B (en) * | 2017-05-11 | 2020-04-07 | 安徽熙泰智能科技有限公司 | Cathode of top-emitting organic electroluminescent device and preparation method thereof |
| CN107093674B (en) * | 2017-06-09 | 2020-03-17 | 上海天马有机发光显示技术有限公司 | Organic light-emitting display panel, preparation method and display device thereof |
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Address after: 1568 Jiugong Road, Jinshan District, Shanghai, 201506 Applicant after: Shanghai Hehui optoelectronic Co., Ltd Address before: 1568 Jiugong Road, Jinshan District, Shanghai, 201506 Applicant before: EverDisplay Optronics (Shanghai) Ltd. |
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