CN110137384A - Display panel and display device - Google Patents
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- CN110137384A CN110137384A CN201910580222.8A CN201910580222A CN110137384A CN 110137384 A CN110137384 A CN 110137384A CN 201910580222 A CN201910580222 A CN 201910580222A CN 110137384 A CN110137384 A CN 110137384A
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- 238000000034 method Methods 0.000 description 5
- 229920001621 AMOLED Polymers 0.000 description 4
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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
- H10K50/805—Electrodes
- H10K50/82—Cathodes
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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
- H10K50/805—Electrodes
- H10K50/82—Cathodes
- H10K50/828—Transparent cathodes, e.g. comprising thin metal 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
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- H—ELECTRICITY
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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Abstract
It includes several sub-pixels that the embodiment of the present invention, which provides a kind of display panel and display device, display panel, and each sub-pixel includes: anode layer, pixel layer and the cathode layer being cascading along first direction；Cathode layer includes the first cathode layer and the second cathode layer being stacked along first direction, wherein the second cathode layer includes several through-holes.Second cathode layer is provided with several through-holes, so that diffraction zone can be formed by multiple through-holes by enabling the second cathode layer region of sub-pixel, enables light by diffraction can occur when diffraction zone.When light project away from luminescent layer by cathode layer, since the first cathode layer is relatively thin, and it is bad so as to improve colour cast to occur when light is by diffraction zone diffraction dispersion, can be good at the colour cast defect of solution display panel.
Description
Technical Field
The invention relates to the technical field of display equipment, in particular to a display panel and a display device.
Background
Organic Light-Emitting diodes (OLEDs) are active Light-Emitting devices. Compared with the traditional Liquid Crystal Display (LCD) Display mode, the OLED Display technology does not need a backlight lamp and has the self-luminous characteristic. The OLED adopts a thin organic material film layer and a glass substrate, and when a current flows, the organic material can emit light. Therefore, the OLED display panel can save electric energy remarkably, can be made lighter and thinner, can endure a wider range of temperature variation than the LCD display panel, and has a larger visual angle. The OLED display panel is expected to become a next-generation flat panel display technology following the LCD, and is one of the technologies that receives the most attention among the flat panel display technologies at present.
An Active-matrix organic light-emitting diode (AMOLED) is used as one of the OLEDs, and adopts a top emission structure, in which a microcavity structure is introduced to modulate the wavelength of the emitted light. The layer structure of the AMOLED comprises a cathode layer, an anode layer and a light emitting layer arranged between the cathode layer and the anode layer, wherein a Fabry-Perot resonant cavity is formed between the anode layer and the cathode layer. Wherein the thickness of the cathode layer has a direct influence on the reflectivity of the cathode. When the metal layer is thick and the reflectivity is large, the AMOLED has a serious color shift problem. When the cathode layer thickness is reduced to improve color shift, the problem of non-uniform transition of the display image is caused.
Therefore, a new display panel and a new display device are needed.
Disclosure of Invention
The embodiment of the invention provides a display panel and a display device, aiming at reducing the color cast defect of the display panel and improving the problem of uneven transition of a display panel picture.
An embodiment of the present invention provides a display panel, including a plurality of sub-pixels, each sub-pixel including: an anode layer, a light emitting layer and a cathode layer sequentially stacked in a first direction; the cathode layer includes a first cathode layer and a second cathode layer stacked in a first direction, wherein the second cathode layer includes a plurality of through holes.
According to an aspect of the invention, the first cathode layer is located on a side of the second cathode layer adjacent to the light emitting layer.
According to one aspect of the present invention, in each sub-pixel, the number of the through holes is two or more, and the two or more through holes are distributed at equal intervals in any one of a line shape, a ring shape or an array.
According to one aspect of the invention, the projection of the through hole on the first cathode layer along the first direction is rectangular, the long side a of the projection of the through hole is formed to extend along the second direction, and the wide side b of the projection of the through hole is formed to extend along the third direction;
the second direction and the third direction are intersected with the first direction, and in each sub-pixel, the through holes are distributed along the second direction and/or the third direction;
preferably, in each sub-pixel, the number of the through holes is two, and the two through holes are distributed in a linear shape at equal intervals; or the number of the through holes is three, and the three through holes are distributed in an annular shape at equal intervals; or the number of the through holes is more than four, and the through holes are distributed in an array at equal intervals.
According to one aspect of the invention, the long side a and the wide side b satisfy the following relationship:
wherein N is1、N2、N3The light source is a positive integer, lambda is the wavelength of light emitted by the sub-pixel, and D is the distance between two adjacent through holes.
According to an aspect of the invention, the projection of the through hole onto the first cathode layer in the first direction is square and the distance D is equal to the long side a.
According to one aspect of the invention, the long side a and/or the wide side b of the projection of the via hole are parallel between the sub-pixels.
According to an aspect of the invention, the thickness of the first cathode layer in the first direction is less than or equal to the thickness of the second cathode layer in the first direction.
According to one aspect of the invention, the thickness of the first cathode layer is between 4nm and 9 nm;
and/or the thickness of the second cathode layer is 6nm to 16 nm;
and/or the total thickness of the cathode layer in the first direction is 10nm to 25 nm.
The second embodiment of the present invention further provides a display device, including the display panel.
In the invention, the display panel comprises a plurality of sub-pixels, and each sub-pixel comprises an anode layer, a light emitting layer and a cathode layer which are sequentially stacked along a first direction. Wherein, the cathode layer is two-layer, is first cathode layer and second cathode layer respectively, and the second cathode layer is provided with a plurality of through-hole to make sub-pixel's second cathode layer region can form the diffraction district through a plurality of through-holes, make light can take place the diffraction when diffraction district. When light is projected from the light emitting layer through the cathode layer, the first cathode layer is thin, and the light can be diffracted and dispersed when passing through the diffraction zone, so that the color cast defect of the display panel can be well solved. Meanwhile, the first cathode layer and the second cathode layer are overlapped, so that the thickness of the whole cathode layer can be increased, and the problem of uneven transition of a picture is solved. Therefore, the invention can reduce the color cast defect of the display panel and simultaneously can improve the problem of uneven transition of the display panel.
Drawings
Other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings in which like or similar reference characters refer to the same or similar parts.
FIG. 1 is a schematic diagram of a layer structure of a display panel according to an embodiment of the invention;
FIG. 2 is a schematic plan view of a display panel according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of Fraunhofer diffraction principles;
FIG. 4 is a schematic diagram of Fraunhofer diffraction intensity distribution;
fig. 5 is a flowchart of a method for manufacturing a display panel according to an embodiment of the invention.
Description of reference numerals:
100. an anode layer;
200. a light emitting layer;
210. an open area; 211. a first sub-pixel opening area; 212. a second sub-pixel opening area; 213. a third sub-pixel opening area;
300. a cathode layer;
310. a first cathode layer;
320. a second cathode layer; 321. a through hole; 321a, a first through hole; 321b, a second through hole; 321c, and a third through hole.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated for convenience in describing the invention and to simplify description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The directional terms appearing in the following description are intended to be illustrative in all directions, and are not intended to limit the specific construction of embodiments of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as either a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
For better understanding of the present invention, the following description is made in detail with reference to fig. 1 to 4 for a display panel and a display device according to an embodiment of the present invention.
Fig. 1 is a schematic layer structure diagram of a display panel according to an embodiment of the present invention, where the display panel includes a plurality of sub-pixels, and each sub-pixel includes: an anode layer 100, a light emitting layer 200, and a cathode layer 300 sequentially stacked in a first direction; wherein; the cathode layer 300 includes a first cathode layer 310 and a second cathode layer 320 stacked in a first direction, and the second cathode layer 320 includes a plurality of through holes 321.
The first direction may be a thickness direction of the display panel, i.e., a Z direction in fig. 1.
The through holes 321 are not limited herein, and the through holes 321 may be blind holes disposed on the second cathode layer 320 or the through holes 321 are disposed through the second cathode layer 320. Preferably, the through hole 321 is disposed through the second cathode layer 320, so as to facilitate the preparation and formation of the through hole 321. In the present invention, the display panel includes an anode layer 100, a light emitting layer 200, and a cathode layer 300, which are stacked. The cathode layer 300 is two layers, which are a first cathode layer 310 and a second cathode layer 320, the second cathode layer 320 is provided with a plurality of through holes 321, and a diffraction region can be formed in an area where the through holes 321 are located, so that light passing through the diffraction region can be diffracted. When light is projected from the light emitting layer 200 through the cathode layer 300, the color shift defect of the display panel can be well solved because the first cathode layer 310 is thin and the light is diffracted and dispersed when passing through the diffraction zone of the second cathode layer 320; meanwhile, the second cathode layer 320 is further stacked on the first cathode layer 310, so that the thickness of the whole cathode layer 300 can be increased, and the problem of uneven transition of the picture can be solved. Therefore, the invention can reduce the color cast defect of the display panel and simultaneously can improve the problem of uneven transition of the display panel.
The first cathode layer 310 and the second cathode layer 320 may be formed in various manners, the first cathode layer 310 may be formed by evaporation on the whole surface or by painting, and the second cathode layer 320 may be formed by evaporation on a mask. Preferably, the first cathode layer 310 is located on one side of the second cathode layer 320 close to the light emitting layer 200, so as to facilitate the preparation and formation of the first cathode layer 310 and the second cathode layer 320.
The display panel may be disposed in any manner, for example, other layer structures such as a hole injection layer and a hole transport layer may be disposed between the anode layer 100 and the light emitting layer 200, and other layer structures such as an electron transport layer and an electron injection layer may be disposed between the light emitting layer 200 and the cathode layer 300, as long as the display panel includes the anode layer 100, the light emitting layer 200, and the cathode layer 300 sequentially stacked in the first direction.
The sub-pixels are formed in the opening regions 210 in correspondence to the light emitting layers 200, and the sub-pixels are disposed in various manners, for example, the sub-pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel, and the first sub-pixel, the second sub-pixel, and the third sub-pixel may be a red sub-pixel, a green sub-pixel, and a blue sub-pixel, respectively. The sub-pixels are formed at the opening areas corresponding to the first sub-pixel opening area 211, the second sub-pixel opening area 212, and the third sub-pixel opening area 213. The second cathode layer 320 is provided with a plurality of through holes 321 corresponding to the opening region 210, and the second cathode layer 320 is formed with first through holes 321a corresponding to the first sub-pixel opening region 211, the second cathode layer 320 is formed with second through holes 321b corresponding to the second sub-pixel opening region 212, and the second cathode layer 320 is formed with first through holes 321c corresponding to the third sub-pixel opening region 213.
Since the sub-pixels of different colors emit light with different wavelengths, the diffraction paths of the light rays of different colors are different when the light rays are diffracted. The plurality of through holes 321 include a first through hole 321a, a second through hole 321b and a third through hole 321c which respectively correspond to the three sub-pixel opening areas 210, so that the sizes of the first through hole 321a, the second through hole 321b and the third through hole 321c can be conveniently adjusted according to the wavelength of light emitted by the sub-pixels with different colors, the light rays of the sub-pixels with different colors are displayed to be consistent after being diffracted, the color cast defect is further improved, and the display effect of the display panel is improved.
The number of the through holes 321 in each sub-pixel is not limited herein, and preferably, in order to ensure the display effect, the number of the through holes 321 in each sub-pixel is two or more, and the two or more through holes 321 are distributed at equal intervals in any one of a line shape, a ring shape, or an array.
That is, the number of the first through holes 321a, the second through holes 321b, and the third through holes 321c is not limited herein, in order to ensure the display effect, the number of the first through holes 321a, the second through holes 321b, and the third through holes 321c is two or more, and the two or more first through holes 321a, the two or more second through holes 321b, or the two or more third through holes 321c are distributed at equal intervals in a linear, circular, or array.
The shape of the through hole 321 is not limited herein, and in some alternative embodiments, the projection of the through hole 321 on the first cathode layer 310 along the first direction is rectangular, the long side a of the projection of the through hole 321 is formed to extend along the second direction, and the wide side b of the projection of the through hole 321 is formed to extend along the third direction; the second direction and the third direction both intersect the first direction, and in each sub-pixel, the plurality of through holes 321 are distributed along the second direction and/or the third direction.
The second direction and the third direction are not limited herein, and for example, the second direction and the third direction are a length direction and a width direction of the display panel, respectively. For example, the second direction is the X direction in fig. 2, and the third direction is the Y direction in fig. 1 and 2.
In these alternative embodiments, the through holes 321 are projected to be rectangular, and the plurality of through holes 321 are distributed along the extending direction of the long side a and/or the wide side b, so that a diffraction grating can be formed corresponding to each sub-pixel region, thereby further improving the diffraction dispersion effect and reducing the color shift of the display panel.
Preferably, when the number of the through holes 321 is two, the two through holes 321 are arranged in a line shape such as a row or a column. For example, two through holes 321 are distributed in the X direction or the Y direction in the drawing. When the number of the through holes 321 is three, the three through holes 321 are arranged in a ring shape at equal intervals. When the number of the through holes 321 is more than four, the through holes 321 are arranged in an array at equal intervals. The distance between the through holes 321 can be ensured to be equal as much as possible, so that the diffraction effect of the light passing through the through holes 321 is ensured. The through hole 321 here may be any one of a first through hole 321a, a second through hole 321b, or a third through hole 321 c. The opening area 210 here may be any one of a first sub-pixel opening area 211, a second sub-pixel opening area 212, or a third sub-pixel opening area 213.
Preferably, as shown in fig. 2, in order to more clearly show the structure of the display panel according to the embodiment of the present invention, the first sub-pixel opening area 211, the second sub-pixel opening area 212, and the third sub-pixel opening area 213 are shown by dotted lines on the second cathode layer 320, and it is understood that the dotted lines in fig. 2 do not constitute a structural limitation on the second cathode layer 320. The first through holes 321a, the second through holes 321b, and the third through holes 321c are distributed in an array along the second direction and the third direction.
As shown in fig. 2, four first through holes 321a are provided, four first through holes 321a are distributed in an array corresponding to the first sub-pixel opening area 211, the same number of second through holes 321b is provided, four second through holes 321b are distributed in an array corresponding to the second sub-pixel opening area 212, ten third through holes 321c are provided, and ten third through holes 321c are distributed in an array corresponding to the third sub-pixel opening area 213. It is to be understood that the number of the first through holes 321a, the second through holes 321b, and the third through holes 321c is not limited thereto, and the number of the first through holes 321a, the second through holes 321b, and the third through holes 321c may be adjusted according to the size of the area of the first sub-pixel opening area 211, the second sub-pixel opening area 212, and the third sub-pixel opening area 213.
In any of the above embodiments, the type of diffraction generated by the through hole 321 in the diffraction region is not limited, and preferably, the through hole 321 can form fraunhofer diffraction in the diffraction region, so that the display effect of the display panel is improved by using the principle of fraunhofer diffraction.
As shown in fig. 3, which is a schematic view of the fraunhofer diffraction principle, each slit width in the fraunhofer grating is a, the width of the shielding part between the slits is b, and the distance d between corresponding points on adjacent slits is a + b, so that the multi-slit fraunhofer diffraction light intensity distribution is as follows:
wherein α andrespectively as follows:
the actual light intensity distribution of the multi-slit fraunhofer diffraction is shown in fig. 4;
although the Fraunhofer diffraction requires the convex lens to project the diffracted light, in the display panel, since the macroscopic observation distance between the user's eyes and the display panel is far larger than f in the figure, it can be considered that the observation distance is far larger than the slit width a and far larger than the size of the through hole 321 in the diffraction region of the second cathode layer 320, and therefore no lens is needed. The shielding part in fraunhofer diffraction corresponds to the part of the second cathode layer 320 between two adjacent through holes 321 in the diffraction region.
Since the display panel is surface-emitting, the number of three sub-pixels and the number of corresponding through holes 321 are very large, and thus the light intensity distribution on the entire surface is uniform after diffraction.
When the multi-slit fraunhofer diffraction principle is adopted, the through hole 321 is a rectangular quadrangular prism hole, and in order to ensure the diffraction effect, the long side a and the wide side b satisfy the following relationship:
wherein N is1、N2、N3The light source is a positive integer, lambda is the wavelength of light emitted by the sub-pixel, and D is the distance between two adjacent through holes.
I.e. the first long side a projected by the first through hole 321a1And a first broadside b1The second long side a projected by the second through hole 321b2And a second broadside b2A third long side a projected by the third through hole 321c3And a third broadside b3The following relationship is satisfied:
wherein,N4、N5、N6、N7、N8、N9、N10、N11、N12are all positive integers, λ1Is the wavelength, lambda, of the light emitted by the first sub-pixel2Is the wavelength, lambda, of the light emitted by the second sub-pixel3Is the wavelength of light emitted by the third sub-pixel, D1Is a first distance between two adjacent first through holes 321a, D2Is a second distance between two adjacent second through holes 321b, D3Is a third distance between two adjacent third through holes 321 c.
Further, in order to reduce the complexity of the manufacturing process of the display panel and further improve the color dispersion effect, the projection of the through hole 321 on the first cathode layer 310 along the first direction is square, and the distance D is equal to the long side a.
Namely, the projections of the first through hole 321a, the second through hole 321b and the third through hole 321c on the first cathode layer 310 along the first direction are all square, and the first distance D is1Is equal to the first long side a1A second distance D2Equal to the second long side a2A third distance D3Equal to the third long side a1。
It can be understood that, when two or more first through holes 321a are arranged in an array along the X and Y directions in fig. 2, the first distance D1The distance between two adjacent first through holes 321a in the X direction may be set, and the distance between two adjacent first through holes 321a in the Y direction may be set. Preferably, the two or more first through holes 321a are uniformly distributed corresponding to the first sub-pixel opening area 211, and the distance between two adjacent first through holes 321a in the X direction is equal to the distance between the adjacent first through holes in the Y direction, thereby further improving the display effect.
Similarly, when two or more second through holes 321b are arranged in an array along the X and Y directions in fig. 2, the second distance D2The distance between two adjacent second through holes 321b in the X direction may be set, and the distance between two adjacent second through holes 321b in the Y direction may be set. Preferably, two or more secondThe through holes 321b are uniformly distributed corresponding to the second sub-pixel opening area 212, and the distance between two adjacent second through holes 321b in the X direction is equal to the distance between the two adjacent second through holes in the Y direction, so that the display effect is further improved.
When two or more third through holes 321c are arranged in an array along the X and Y directions in fig. 2, the third distance D3The distance between two adjacent third through holes 321c in the X direction may be set, and the distance between two adjacent third through holes 321c in the Y direction may be set. Preferably, more than two third through holes 321c are uniformly distributed corresponding to the third sub-pixel opening area 213, and the distance between two adjacent third through holes 321c in the X direction is equal to the distance between the adjacent third through holes in the Y direction, thereby further improving the display effect.
In order to ensure uniformity of diffraction effect among the sub-pixels, the projected long side a and/or wide side b of the via hole 321 among the sub-pixels are parallel. Further, the projected long side a and wide side b of the through hole 321 between the sub-pixels are parallel. As shown in fig. 2, the first long side a1The second long side a2And a third long side a3Two by two are parallel to each other, the first wide side b1A second broad side b2And a third broadside b3Two of them are parallel to each other.
To further improve the polarization failure, in some alternative embodiments, the thickness of the first cathode layer 310 in the first direction is less than or equal to the thickness of the second cathode layer 320 in the first direction. The first cathode layer 310 has a small thickness, and thus the color shift defect of the display panel can be further improved.
The thickness of the first cathode layer 310 is not limited herein, and preferably, the thickness of the first cathode layer 310 is 4nm to 9 nm. The thickness of the first cathode layer 310 is within a reasonable range, so that the second cathode layer 320 cannot compensate for the uneven transition of the picture due to the too small thickness of the first cathode layer 310, and the color cast defect is prevented from being serious due to the too large thickness of the first cathode layer 310.
The thickness of the second cathode layer 320 is not limited herein, and preferably, the thickness of the second cathode layer 320 is 6nm to 16 nm. The thickness of the second cathode layer 320 is within a reasonable range, so that the problem that the picture transition is not uniform due to the fact that the thickness of the second cathode layer 320 is too small can be solved, meanwhile, material waste caused by too large thickness of the second cathode layer 320 is avoided, and the problem that the color cast defect cannot be compensated through the through hole 321 due to too large thickness is avoided.
Further, in order to secure the display effect, the total thickness of the cathode layer 300 in the first direction is 10nm to 25 nm.
A second embodiment of the present invention further provides a display device including the display panel of any one of the above embodiments.
The third embodiment of the present invention also provides a method for manufacturing a display panel, including:
step S1: an anode layer is formed.
There are various methods for forming the anode layer 100, and for example, the anode layer is formed on the substrate by a method such as vapor deposition.
Step S2: a light emitting layer is formed on the anode layer.
There are various ways to form the light emitting layer 200, and other necessary layer structures may be formed on the anode layer 100 before forming the light emitting layer 200, and then the light emitting layer 200 is formed by evaporation. The light emitting layer 200 has an opening region 210, and a plurality of sub-pixels are formed in the opening region 210 by evaporation.
Step S3: a first cathode layer is formed on the light emitting layer.
On the side of the light-emitting layer 200 remote from the metal layer, a first cathode layer 310 is formed by evaporation of a material such as a metal over the entire surface. A microcavity is formed between the first cathode layer 310 and the anode layer 100 to modulate the wavelength of light. When the light of the light emitting layer 200 passes through the first cathode layer 310, the first cathode layer 310 is thin, so that the problem of color shift unevenness can be improved.
Step S4: a mask is provided and placed.
A mask is prepared according to the structure of the second cathode layer 320 in the display panel of the first embodiment. A mask plate is disposed on a side of the first cathode layer 310 away from the light-emitting layer 200, and openings of the mask plate correspond to the non-opening regions and the partial opening regions 210 of the light-emitting layer 200.
Step S5: and forming a second cathode layer by evaporation.
The second cathode layer 320 formed by mask evaporation has a diffraction region corresponding to the opening region 210, and a plurality of through holes 321 are formed in the diffraction region, so that the light intensity of monochromatic light can be spatially diffracted and dispersed when the light passes through the diffraction region, thereby improving the problem of color shift unevenness. Moreover, the first cathode layer 310 and the second cathode layer 320 are thicker, so that the problem of uneven transition of the picture can be well solved.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. For example, the algorithms described in the specific embodiments may be modified without departing from the basic concepts of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. A display panel comprising a plurality of sub-pixels, each of the sub-pixels comprising: an anode layer, a light emitting layer and a cathode layer sequentially stacked in a first direction;
the cathode layer includes a first cathode layer and a second cathode layer stacked in the first direction, wherein the second cathode layer includes a plurality of through holes.
2. The display panel according to claim 1, wherein the first cathode layer is located on a side of the second cathode layer adjacent to the light emitting layer.
3. The display panel according to claim 1, wherein the number of the through holes in each of the sub-pixels is two or more, and the two or more through holes are distributed at equal intervals in any one of a line shape, a ring shape, or an array.
4. The display panel according to claim 1, wherein a projection of the through hole on the first cathode layer along the first direction is rectangular, a long side a of the projection of the through hole is formed to extend along a second direction, and a wide side b of the projection of the through hole is formed to extend along a third direction;
the second direction and the third direction are intersected with the first direction, and in each sub-pixel, a plurality of through holes are distributed along the second direction and/or the third direction;
preferably, in each sub-pixel, the number of the through holes is two, and the two through holes are distributed in a linear shape at equal intervals; or the number of the through holes is three, and the three through holes are distributed in an annular shape at equal intervals; or the number of the through holes is more than four, and the through holes are distributed in an array at equal intervals.
5. The display panel according to claim 4, wherein the long side a and the wide side b satisfy the following relationship:
wherein N is1、N2、N3The light source is a positive integer, lambda is the wavelength of light emitted by the sub-pixel, and D is the distance between two adjacent through holes.
6. The display panel according to claim 5, wherein a projection of the through hole on the first cathode layer in the first direction is square, and the distance D is equal to the long side a.
7. The display panel according to claim 4, wherein the long side a and/or the wide side b of the through hole projection are parallel between the sub-pixels.
8. The display panel according to claim 1, wherein a thickness of the first cathode layer in the first direction is less than or equal to a thickness of the second cathode layer in the first direction.
9. The display panel according to claim 1, wherein the thickness of the first cathode layer is 4nm to 9 nm; and/or the thickness of the second cathode layer is 6nm to 16 nm; and/or the total thickness of the cathode layer in the first direction is 10nm to 25 nm.
10. A display device characterized by comprising the display panel according to any one of claims 1 to 9.
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