CN113053980A - Display panel, preparation method thereof and display device - Google Patents
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
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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
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- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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Abstract
A display panel, a preparation method thereof and a display device are provided, wherein the display panel comprises: the array substrate comprises a color film layer arranged on a substrate and a first polarizing layer arranged on one side, far away from the substrate, of the color film layer, the array substrate comprises a driving structure layer, a light emitting structure layer and a second polarizing layer which are sequentially arranged, the first polarizing layer comprises a plurality of first polarizing units, the second polarizing layer comprises a plurality of second polarizing units, the first polarizing units correspond to the second polarizing units in a one-to-one mode, the polarizing directions of the first polarizing units and the second polarizing units which correspond to each other are the same, the polarizing directions of the adjacent first polarizing units are different, the polarizing directions of the adjacent second polarizing units are different, and the orthographic projection of the first polarizing units and the orthographic projection of the corresponding second polarizing units are overlapped on a plane parallel to the substrate. The scheme provided by the embodiment reduces cross color interference between the areas corresponding to different polarization units.
Description
Technical Field
The present disclosure relates to display technologies, and particularly to a display panel, a method for manufacturing the display panel, and a display device.
Background
Because the photoluminescence spectrum of the QD material has a very narrow half-peak width, the OLED + QD display device has the technical advantages of high color gamut and high color purity, and does not have viewing angle dependence. However, cross color problems exist with the cartridge configuration, which can result in a reduction in color gamut.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The embodiment of the application provides a display panel, a preparation method thereof and a display device, and cross color interference is reduced.
In one aspect, an embodiment of the present application provides a display panel, including: the array substrate comprises a color film layer arranged on a substrate and a first polarization layer arranged on one side, far away from the substrate, of the color film layer, the array substrate comprises a driving structure layer, a light emitting structure layer and a second polarization layer which are sequentially arranged, the first polarization layer comprises a plurality of first polarization units, the second polarization layer comprises a plurality of second polarization units, the first polarization units correspond to the second polarization units in a one-to-one mode, the polarization directions of the first polarization units and the second polarization units which correspond to each other are the same, the polarization directions of the adjacent first polarization units are different, the polarization directions of the adjacent second polarization units are different, and the orthographic projections of the first polarization units and the orthographic projections of the corresponding second polarization units are overlapped on a plane parallel to the substrate.
In an exemplary embodiment, an orthographic projection of the first polarization unit coincides with an orthographic projection of the corresponding second polarization unit on a plane parallel to the substrate.
In an exemplary embodiment, the display panel includes a plurality of sub-pixels, the sub-pixels are in one-to-one correspondence with the polarization unit groups, each of the polarization unit groups includes a first polarization unit and a second polarization unit corresponding to each other, and on a plane parallel to the substrate, an orthogonal projection of a pixel opening area of the sub-pixel overlaps with an orthogonal projection of the corresponding first polarization unit and overlaps with an orthogonal projection of the corresponding second polarization unit.
In an exemplary embodiment, on a plane parallel to the substrate, an orthogonal projection of the pixel opening region of the sub-pixel is located within an orthogonal projection of the corresponding first and second polarization units and outside an orthogonal projection of the non-corresponding first and second polarization units.
In an exemplary embodiment, adjacent first polarization units are connected to each other, or there is a partial overlap; adjacent second polarization units are connected with each other, or are partially overlapped; the display panel comprises a plurality of sub-pixels, and on a plane parallel to the substrate, orthographic projections of overlapping regions of adjacent first polarization units are positioned outside orthographic projections of pixel opening regions of the sub-pixels, and orthographic projections of overlapping regions of adjacent second polarization units are positioned outside orthographic projections of pixel opening regions of the sub-pixels.
In an exemplary embodiment, the first polarizing layer has a thickness of 0.5 to 5 micrometers and the second polarizing layer has a thickness of 0.5 to 5 micrometers in a direction perpendicular to the substrate.
In an exemplary embodiment, the first polarizing layer includes first polarizing units of a first polarization direction and first polarizing units of a second polarization direction, the first polarizing units of the first polarization direction and the first polarizing units of the second polarization direction being alternately arranged;
the second polarizing layer comprises a second polarizing unit with a first polarizing direction and a second polarizing unit with a second polarizing direction, and the second polarizing unit with the first polarizing direction and the second polarizing unit with the second polarizing direction are alternately arranged.
In an exemplary embodiment, an encapsulation layer is disposed between the light emitting structure layer and the second polarizing layer.
In an exemplary embodiment, the color film layer includes a quantum dot material layer.
In another aspect, an embodiment of the present disclosure provides a display device, including the display panel.
In another aspect, an embodiment of the present disclosure provides a method for manufacturing a display panel, including:
forming a color film substrate, wherein the color film substrate comprises a color film layer arranged on a substrate and a first polarizing layer arranged on one side of the color film layer away from the substrate; the first polarizing layer comprises a plurality of first polarizing units, and the polarization directions of the adjacent first polarizing units are different;
forming an array substrate, wherein the array substrate comprises a driving structure layer, a light emitting structure layer and a second polarizing layer which are sequentially arranged, the second polarizing layer comprises a plurality of second polarizing units, the polarization directions of the adjacent second polarizing units are different, the second polarizing units correspond to the first polarizing units one by one, and the polarization directions of the first polarizing units and the second polarizing units which correspond to each other are the same;
and carrying out box alignment on the color film substrate and the array substrate, wherein the orthographic projection of the first polarization unit is overlapped with the orthographic projection of the corresponding second polarization unit on a plane parallel to the substrate.
The embodiment of the application comprises a display panel, a preparation method of the display panel and a display device. The display panel comprises an array substrate and a color film substrate, the color film substrate comprises a color film layer arranged on a substrate, and a first polarization layer arranged on one side, away from the substrate, of the color film layer, the array substrate comprises a driving structure layer, a light emitting structure layer and a second polarization layer which are sequentially arranged, the first polarization layer comprises a plurality of first polarization units, the second polarization layer comprises a plurality of second polarization units, the first polarization units are in one-to-one correspondence with the second polarization units, the polarization directions of the first polarization units and the second polarization units which correspond to each other are the same, the polarization directions of the adjacent first polarization units are different, the polarization directions of the adjacent second polarization units are different, and the orthographic projection of the first polarization unit and the orthographic projection of the corresponding second polarization unit are overlapped on a plane parallel to the substrate. The scheme provided by the embodiment reduces cross color interference between the areas corresponding to different polarization units.
Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the disclosure may be realized and attained by the structure particularly pointed out in the written description and drawings.
Other aspects will be apparent upon reading and understanding the attached drawings and detailed description.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosed embodiments and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic view of a display panel according to an embodiment;
FIG. 2 is a schematic cross-color diagram of the embodiment shown in FIG. 1;
fig. 3 is a schematic view of a display panel provided in an embodiment of the disclosure;
FIG. 4 is a schematic diagram of an exemplary implementation of a polarization unit arrangement;
FIG. 5 is a schematic diagram of the locations of the polarization units and sub-pixels provided in an exemplary embodiment;
FIG. 6 is a schematic diagram of the dimensions of a polarization unit provided in an exemplary embodiment;
FIG. 7 is a schematic diagram of the dimensions of a polarizing cell provided in an exemplary embodiment (length L1);
FIG. 8 is a schematic illustration of cross color prevention provided by an exemplary embodiment;
fig. 9 is a flowchart of a method for manufacturing a display panel according to an embodiment of the disclosure.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present application, the embodiments and features of the embodiments may be arbitrarily combined with each other without conflict.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
In the drawings, the size of each component, the thickness of layers, or regions may be exaggerated for clarity. Therefore, the embodiments of the present disclosure are not necessarily limited to the dimensions, and the shapes and sizes of the respective components in the drawings do not reflect a true scale. Further, the drawings schematically show ideal examples, and the embodiments of the present disclosure are not limited to the shapes or numerical values shown in the drawings.
The ordinal numbers such as "first", "second", "third", etc., in this disclosure are provided to avoid confusion among the constituent elements, and do not indicate any order, number, or importance.
In the present disclosure, for convenience, terms indicating orientation or positional relationship such as "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like are used to explain positional relationship of constituent elements with reference to the drawings, only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured in a specific orientation, and be operated, and thus, should not be construed as limiting the present disclosure. The positional relationship of the components is changed as appropriate in accordance with the direction in which each component is described. Therefore, the words described in the disclosure are not limited thereto, and may be replaced as appropriate.
In this disclosure, the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically stated or limited. For example, it may be a fixed connection, or a removable connection, or an integral connection; can be a mechanical connection, or an electrical connection; either directly or indirectly through intervening components, or both may be interconnected. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.
In the present disclosure, "parallel" means a state in which an angle formed by two straight lines is-10 ° or more and 10 ° or less, and therefore, includes a state in which the angle is-5 ° or more and 5 ° or less. The term "perpendicular" refers to a state in which the angle formed by two straight lines is 80 ° or more and 100 ° or less, and therefore includes a state in which the angle is 85 ° or more and 95 ° or less. Overlapping includes completely overlapping, or alternatively,
in the present disclosure, "film" and "layer" may be interchanged with one another. For example, the "conductive layer" may be sometimes replaced with a "conductive film". Similarly, the "insulating film" may be replaced with an "insulating layer".
In the double-box type QD-OLED structure, due to the existence of an encapsulation layer and an intermediate filling layer, a larger box thickness exists between a blue OLED light emitting layer and a QD color film, but light blocking structures are lacked between adjacent sub-pixels except a Pixel Definition Layer (PDL) and a Black Matrix (BM), so that interference of light emission between the sub-pixels is easily caused, the QD-OLED structure has a cross color problem, and the display color gamut and the color purity of a screen are reduced.
Fig. 1 is a schematic structural diagram of a pair of box-type QD-OLED display panels according to a technical scheme. As shown in fig. 1, the display panel includes: the array substrate and the color film substrate are arranged in an opposite box manner, and blue light emitted by a light emitting device in the array substrate can irradiate on a quantum dot material layer in the color film substrate so as to excite the quantum dot material in the color film substrate to emit red light and green light, so that color display is realized. The array substrate includes: drive structural layer 1, light emitting structure layer and first encapsulated layer 14, drive structural layer 1 includes first base and sets up the thin film transistor on first base, and drive structural layer 1 provides control circuit and drive circuit, controls the switch and the luminance of light emitting structure layer, and the light emitting structure layer includes: a first electrode 10, a pixel defining layer 11, an organic light emitting layer 12, and a second electrode 13. The first electrode 10 may be a reflective anode, the second electrode 13 may be a transparent cathode, and the organic light emitting layer 12 may emit blue light. The color film substrate may include: the color filter comprises a second substrate 16, a black matrix 17, a color film layer 18 and a second packaging layer 19 which are sequentially arranged on the second substrate 16, wherein the color film layer 18 can comprise a quantum dot material layer, and the quantum dot material layer can be excited by blue light to emit red light or green light. In order to ensure the box thickness, a filling layer 21 is generally provided between the array substrate and the color filter substrate to fill the gap between the array substrate and the color filter substrate. The filling layer 21 may be a filling glue. Because the refractive indexes of the first encapsulation layer 14 and the filling layer 21 in the array substrate are different, light emitted by the organic light emitting layer 12 in the array substrate is refracted when the light irradiates the filling layer 21 through the first encapsulation layer 14, so that the light-emitting angle is deflected. In addition, the thickness of the filling layer 21 is relatively thick (generally greater than 10 μm), which results in a relatively large distance between the organic light emitting layer 12 in the array substrate and the quantum dot material layer in the color filter substrate. Therefore, the light rays which are originally deflected due to refraction cannot be incident on the quantum dot material layer in the designated area, and color cross is easily caused when other corresponding quantum dot material layers are irradiated, so that poor display is caused, and the display effect is influenced. As shown in fig. 2, light that should be irradiated onto the opposite red quantum dot material layer QD-R actually irradiates onto the green quantum dot material layer QD-G, resulting in cross-color between the red light and the green light.
In the embodiment of the present disclosure, a display panel is provided, which includes two polarizing layers, each polarizing layer includes a plurality of polarizing units, the polarizing directions of adjacent polarizing units are different, due to the existence of the double-layer polarizer layer, the blue light can only pass through the polarizing unit with the specific polarization direction corresponding to the position of the sub-pixel after being emitted by the organic light emitting layer, and the QDs corresponding to the sub-pixels are excited, because the polarization directions of the polarization units adjacent to the sub-pixel positions are different, the light emitted from the blue organic light emitting layer at the pixel position cannot pass through any adjacent polarization units with different polarization directions, the light emitted from the blue organic light emitting layer at the sub-pixel position cannot excite the QDs of the neighboring pixels, therefore, the structure can effectively prevent the interference of the light emitted from the blue organic light emitting layer to the adjacent sub-pixels, improve the color crosstalk problem of the box type QD-OLED and improve the display color gamut.
Fig. 3 is a schematic diagram of a display panel according to an embodiment of the disclosure. As shown in fig. 3, an embodiment of the present disclosure provides a display panel including: the array substrate and the color film substrate are arranged in a box-to-box mode and can be bonded through a filling layer 21, the array substrate can comprise a driving structure layer 1, a light emitting structure layer, a first packaging layer 14 and a second polarizing layer 15 which are sequentially arranged, the driving structure layer 1 can comprise a first substrate and a thin film transistor arranged on the first substrate, and the light emitting structure layer comprises a first electrode 10, a pixel defining layer 11, an organic light emitting layer 12 and a second electrode 13 which are sequentially arranged. The pixel defining layer 11 defines a pixel opening area of the plurality of sub-pixels, and the organic light emitting layer 12 is disposed in the pixel opening area. The color film substrate may include a second substrate 16, a black matrix 17, a color film layer 18, a second encapsulation layer 19, and a first polarizing layer 20, which are sequentially disposed. First polarisation layer 20 includes a plurality of first polarisation units, and the polarization direction of adjacent first polarisation unit is different, second polarisation layer 15 includes a plurality of second polarisation units, and the polarization direction of adjacent second polarisation unit is different, first polarisation unit sets up to obtain the polarized light of corresponding polarization direction with the light filtration of incidenting, the polarized light of corresponding polarization direction is obtained to the light filtration that the second polarisation unit set up to incidenting, first polarisation unit with second polarisation unit one-to-one, and the polarization direction of the first polarisation unit that corresponds each other and second polarisation unit is the same, on being on a parallel with on the plane of first base or second base, there is the overlap in the orthographic projection of first polarisation unit and the orthographic projection of the second polarisation unit that corresponds.
According to the scheme provided by the embodiment, the first polarization unit converts incident light into polarized light in a polarization direction, and the polarized light can pass through the corresponding second polarization units (the polarization directions are the same) and cannot pass through the adjacent second polarization units (the polarization directions are different), so that light emitted by the light emitting structure layer in the area covered by the first polarization unit can only pass through the second polarization unit corresponding to the first polarization unit to enter the color film layer after passing through the first polarization unit, and cannot pass through the second polarization unit adjacent to the second polarization unit, thereby reducing cross color interference.
In an exemplary embodiment, the orthographic projection of the first polarization unit and the orthographic projection of the corresponding second polarization unit may coincide on a plane parallel to the first or second substrate 16, but is not limited thereto. The overlap includes a complete overlap or a small deviation between the two.
In an exemplary embodiment, the first polarizing layer 20 may be disposed between the color film layer 18 and the second encapsulation layer 19. I.e. the position of the first polarizing layer 20 may be changed. When the first polarizing layer 20 is disposed on the side of the second packaging layer 19 away from the second substrate, the process is more convenient, and the color film layer 18 can be better protected.
In an exemplary embodiment, the second polarizing layer 15 may be disposed between the organic light emitting layer 12 and the encapsulation layer 14. I.e. the position of the second polarizing layer 15 can be changed. When the second polarizing layer 15 is disposed on the side of the encapsulation layer 14 away from the first substrate, the process is more convenient, and the light emitting structure layer can be better protected.
In an exemplary embodiment, the display panel includes a plurality of pixels including a plurality of sub-pixels, for example, the pixels may include a first color sub-pixel, for example, red, a second color sub-pixel, for example, green, and a third color sub-pixel, for example, blue. The sub-pixel may include a light emitting structure layer and a corresponding color film layer. The light emitting structure layer can emit blue light, and the color film layer can be excited by the blue light to respectively emit red light and green light. The embodiments of the present application are not limited thereto. The light emitting structure layer can emit white light, the color film layer can be excited by the white light to respectively emit red light, green light, blue light and the like, or the light emitting structure layer can emit the blue light, the color film layer can comprise a white light quantum dot material layer, the white light quantum dot material layer is excited by the blue light to emit the white light, and the white light passes through the red light filter, the green light filter and the blue light filter to generate the red light, the green light and the blue light. The sub-pixels are in one-to-one correspondence with the polarized light unit groups, each polarized light unit group comprises a first polarized light unit and a second polarized light unit which correspond to each other, and on a plane parallel to the substrate, the orthographic projection of the pixel opening area of the sub-pixels is overlapped with the orthographic projection of the corresponding first polarized light unit, and the orthographic projection of the pixel opening area of the sub-pixels is overlapped with the orthographic projection of the corresponding second polarized light unit. That is, one first polarization unit and one second polarization unit corresponding to each other constitute one polarization unit group. The polarization directions of the polarized light unit groups corresponding to the adjacent sub-pixels are different. In the scheme provided by this embodiment, after light emitted by a sub-pixel is emitted through the first polarization unit of the corresponding polarization unit group, the light can be emitted to the color film layer of the sub-pixel only through the corresponding second polarization unit, so that cross color interference between sub-pixels is reduced.
In an exemplary embodiment, on a plane parallel to the first substrate or the second substrate, an orthogonal projection of the pixel opening region of the sub-pixel is located within an orthogonal projection of the corresponding first polarization unit and the second polarization unit and outside an orthogonal projection of the non-corresponding first polarization unit and the second polarization unit. According to the scheme provided by the implementation, the light emitted by the sub-pixel reaches the color film layer of the sub-pixel through the first polarization unit and the second polarization unit which correspond to each other, but cannot reach the color film layer of the adjacent sub-pixel, and color cross is prevented.
In an exemplary embodiment, a cross-section of the first polarization unit may be rectangular in a plane parallel to the first substrate or the second substrate, or other shapes such as a hexagon. The cross-sectional shapes of the different first polarization units may be the same or different. The sizes of the cross sections of the different first polarization units may be the same or different. The second polarization unit is similar to the first polarization unit and is not described in detail.
In an exemplary embodiment, the polarization directions of the first and second polarization units may be one or more of linear polarization, circular polarization, and elliptical polarization, and may be linear polarization, for example. The linearly polarized light may include two polarization directions: a vertical polarization state and a horizontal polarization state.
In an exemplary embodiment, the first polarizing layer 20 may include first polarizing units of a first polarization direction and first polarizing units of a second polarization direction, the first polarizing units of the first polarization direction and the first polarizing units of the second polarization direction being alternately arranged; the second polarizing layer 15 may include second polarizing units of a first polarization direction and second polarizing units of a second polarization direction, and the second polarizing units of the first polarization direction and the second polarizing units of the second polarization direction are alternately disposed. The arrangement of the polarizing units of the first polarizing layer and the second polarizing layer may be the same. As shown in fig. 4, the first polarizing layer 20 may include two types of first polarizing units, a type and B type, wherein the first polarizing unit of the a type has a first polarization direction, the first polarizing unit of the B type has a second polarization direction, the first polarizing unit of the a type and the first polarizing unit of the B type are alternately disposed, and the first polarizing unit of the a type and the first polarizing unit of the B type may be alternately disposed along an arrangement direction of the sub-pixels to form a polarizing unit array. In another embodiment, the first polarizing layer 20 may include more types of first polarizing units (more than two types), and the polarization directions of the adjacent first polarizing units are different, and the process is simple using only two types of first polarizing units. The second polarizing unit of the second polarizing layer 15 is similar and will not be described in detail.
In an exemplary embodiment, adjacent first polarization units may be connected to each other, or there may be a partial overlap; adjacent second polarization units may be connected to each other, or there may be a partial overlap. As shown in fig. 4, adjacent first polarization units are connected to each other; in another embodiment, the adjacent first polarization units may partially overlap, and the orthographic projection of the overlapped region is located outside the pixel opening region of the sub-pixel.
FIG. 5 is a schematic diagram illustrating the alignment relationship between the sub-pixels and the polarization units. As shown in fig. 5, the display panel includes a plurality of sub-pixels 51 (shown in fig. 5a as pixel opening regions of the sub-pixels), the sub-pixels 51 correspond to the first polarization units and the second polarization units one to one, and on a plane parallel to the first substrate or the second substrate, an orthogonal projection of the pixel opening region of the sub-pixel 51 may be located within an orthogonal projection of the corresponding first polarization unit or the corresponding second polarization unit and outside an orthogonal projection of the first polarization unit and the corresponding second polarization unit. For convenience of explanation, the sub-pixels in fig. 5 are arranged in a side by side (side by side) manner, but the present embodiment is not limited thereto, and the sub-pixels may be arranged in another manner, and the arrangement of the first polarization unit and the second polarization unit may be changed accordingly.
In an exemplary embodiment, the first polarizing layer may have a thickness of 0.5 to 5 micrometers (um), for example, 1 micrometer, and the second polarizing layer may have a thickness of 0.5 to 5 micrometers, for example, 1 micrometer, in a direction perpendicular to the first or second substrate.
In an exemplary embodiment, the first and second polarizing layers 20 and 15 are prepared by a method including, but not limited to, nanoimprinting or stitching transfer.
In an exemplary embodiment, the splicing transfer manner includes: splicing an A-type polarizing unit and a B-type polarizing unit together, and then respectively attaching the polarizing units to the array substrate and the color film substrate in a transfer printing mode, wherein the polarizing units are respectively aligned with the color film layer and the organic light-emitting layer during transfer printing. When the polarizing unit array is prepared by nanoimprint or stitching transfer, adjacent polarizing units may not be connected, or may be connected together or partially overlapped.
Taking the side by side pixel arrangement as an example, the connection manner of adjacent polarization units is shown in FIG. 6. A1 is a first polarizing unit of type A, B1 is a first polarizing unit of type B, A2 is a second polarizing unit of type A, and B2 is a second polarizing unit of type B. The length of the polarization unit may be at least L1 and at most L1+ L2+ L3, where L1 corresponds to the length of the pixel opening region of a single sub-pixel in the sub-pixel arrangement direction, L2 (or L3) corresponds to the length of the black matrix or Pixel Definition Layer (PDL) between two sub-pixels in the sub-pixel arrangement direction, and L2 and L3 may be the same or may be different; when the polarizing unit has the minimum length L1, no connection occurs between adjacent polarizing units, as shown in fig. 7; when the length of the polarization unit is L1+ (L2+ L3)/2, adjacent polarization units are just connected together, but the embodiment of the present disclosure is not limited thereto, and the length of one polarization unit may be greater than L1+ (L2+ L3)/2, the length of one polarization unit may be less than L1+ (L2+ L3)/2, and the sum of the lengths of two adjacent polarization units is 2L1+ L2+ L3, which is an ideal connection mode, and the cross color problem may be completely prevented, as shown in fig. 3; when L1+ (L2+ L3)/2< the length of the polarizing unit is less than or equal to L1+ L2+ L3, the adjacent polarizing units are partially overlapped, and the overlapped area is positioned outside the opening area of the sub-pixel, so that the effect of the polarizer array is not influenced by the partially overlapped condition, and the cross color problem can be completely prevented. In the actual manufacturing process, since there is some deviation in the process, it is considered that the length of the polarizing unit is acceptable in the range of L1 to L1+ L2+ L3. In an exemplary embodiment, the length of the polarization unit may be L1+ (L2+ L3)/2 to L1+ L2+ L3.
In an exemplary implementation, the polarizing unit may be prepared using, but not limited to, PVA (polyvinyl alcohol).
In an exemplary embodiment, the first electrode 10 may be an anode, the second electrode 13 may be a cathode, and the organic light emitting layer 12 may emit blue light under the driving of a voltage between the cathode and the anode, and irradiate the blue light to a quantum dot material layer in a color filter substrate disposed in a box-to-box manner with the array substrate, so as to implement color display. In an exemplary embodiment, the first electrode 10 may be a separately provided bulk electrode, and an anodic electrical signal may be input for each corresponding organic light emitting layer 12; the second electrode 13 may be a full-surface electrode, and a cathode electric signal may be input to the plurality of organic light emitting layers 12 through the same signal line. It is understood that the light emitting structure layer may include a film layer such as a hole injection layer and a hole transport layer between the first electrode 10 and the organic light emitting layer 12, and a film layer such as an electron injection layer and an electron transport layer between the second electrode 13 and the light emitting layer 12, in addition to the above film layers.
In an exemplary embodiment, the first encapsulation layer 14 may have a three-layer structure, that is, a first inorganic encapsulation layer, an organic encapsulation layer and a second inorganic encapsulation layer sequentially disposed on the light emitting structure layer, wherein the first inorganic encapsulation layer may be a silicon nitride layer or a silicon oxide layer, the second inorganic encapsulation layer may be a silicon nitride layer or a silicon oxide layer, and the organic encapsulation layer may be an organic material layer formed by inkjet printing.
In an exemplary embodiment, the color film layer 18 may include a quantum dot material layer, or may include a color filter and a quantum dot material layer, and the color filter is disposed on a side of the quantum dot material layer close to the second substrate 16. However, the embodiments of the present application are not limited thereto, and the quantum dot material layer may be other materials that can be excited. For example, the color film layer 18 of the red sub-pixel may include a red quantum dot material layer and a red filter, the color film layer 18 of the green sub-pixel may include a green quantum dot material layer and a green filter, and the color film layer 18 of the blue sub-pixel may include scattering particles and a blue filter, or only include a blue filter. When the blue light shines red quantum dot material layer, can arouse red quantum dot material layer to send ruddiness, when the blue light shines green quantum dot material layer, can arouse green quantum dot material layer to send the green glow. According to the scheme provided by the embodiment, after being emitted by the organic light emitting layer, blue light can only pass through the polarization unit with the specific polarization direction corresponding to the sub-pixel position, and the quantum dot material layer corresponding to the sub-pixel is excited, and because the polarization directions of the polarization units adjacent to the sub-pixel position are different, the emergent light of the organic light emitting layer at the sub-pixel position cannot pass through any adjacent polarization units with different polarization directions, the emergent light of the organic light emitting layer at the sub-pixel position cannot excite the quantum dot material layer of the adjacent sub-pixel, so that the structure can effectively prevent the interference of the emergent light of the organic light emitting layer of the sub-pixel on the adjacent sub-pixel, the problem of color crosstalk of the box type QD-OLED is solved, and the display color gamut is improved.
The working principle of the display panel provided by the embodiment of the disclosure for preventing color crosstalk is described below by taking the way that the sub-pixels are arranged in a side by side manner and the polarizing units are linear polarizers with different polarization directions as examples. As shown in fig. 8, the light beam emitted from the blue organic light emitting layer corresponding to the red quantum dot material layer QD-R has two polarization states, i.e., parallel and vertical, after passing through the second polarization unit a21, the light beam has only a vertical polarization state (indicated by black dots), because the polarization directions of the upper and lower polarization units a11 and a21 corresponding to the red sub-pixel are the same, the light beam can continue to pass through the first polarization unit a11 and then excite the red quantum dot material layer QD-R to emit light, and for the large-angle light beam at the sub-pixel, after passing through the first polarization unit a21, the light beam has a vertical polarization state, and when the light beam passes through the upper first polarization unit B1, the light beam cannot pass through the first polarization unit B1 and therefore cannot reach the adjacent green quantum dot material layer QD-G, and thus cannot excite the adjacent green quantum dot material layer QD-G to emit light, so that no cross-color problems occur. Similarly, when the light beam emitted by the blue organic light emitting layer corresponding to the green quantum dot material layer QD-G passes through the second polarization unit B2, the light beam has a parallel polarization state (indicated by a black rectangle), and passes through the upper first polarization unit B1, the green quantum dot material layer QD-G can be excited to emit light, and for the light beam with a large angle at the sub-pixel, after passing through the second polarization unit B2, the polarization state changes into a parallel polarization state, and cannot pass through the first polarization unit a11 or a12 adjacent to the polarization state, so that the light beam cannot reach the position of the adjacent red quantum dot material layer QD-R or blue sub-pixel, thereby avoiding the cross color problem.
Fig. 9 is a flowchart of a method for manufacturing a display panel according to an embodiment of the disclosure. As shown in fig. 9, a method for manufacturing a display panel provided in an embodiment of the present disclosure may include:
the manufacturing sequence of the array substrate and the color film substrate is not limited, and the array substrate and the color film substrate can be manufactured sequentially or synchronously.
And 903, performing box alignment on the color film substrate and the array substrate, wherein the orthographic projection of the first polarization unit and the orthographic projection of the corresponding second polarization unit are overlapped on a plane parallel to the substrate.
In an exemplary embodiment, the forming a color filter substrate may include:
manufacturing a black matrix on a second substrate;
forming a color filter layer in the gap formed by the black matrix; the color filter layer may include a red filter, a green filter, and a blue filter;
respectively depositing a red quantum dot material layer, a green quantum dot material layer and scattering particles;
forming a second packaging layer;
a first polarizing layer including a plurality of first polarizing units is manufactured through nanoimprint, and the first polarizing units are aligned with the pixel opening regions during manufacturing.
In an exemplary embodiment, the forming the array substrate may include:
sequentially forming an active layer, a gate electrode, a source electrode and a drain electrode on a first substrate;
forming an anode, a pixel defining layer, an organic light emitting layer and a cathode;
forming a first packaging layer;
and manufacturing a second polarizing layer comprising a plurality of second polarizing units on the first packaging layer through nanoimprint, and aligning the second polarizing units with the pixel opening regions during manufacturing.
The details of the color film substrate and the array substrate refer to the embodiments of the display panel, and are not repeated.
The display panel provided by the embodiment of the disclosure is prepared by forming a display panel provided with two polarizing layers, wherein the polarizing layers are provided with polarizing units, the polarization directions of adjacent polarizing units are different, and the polarization directions of corresponding polarizing units in the two polarizing layers are the same, so that the light incident to one polarizing unit can be prevented from being emitted from the adjacent polarizing unit of the polarizing unit corresponding to the polarizing unit, the cross color is reduced, and the display quality is improved.
The embodiment of the disclosure also provides a display device, which comprises the display panel of the foregoing embodiment. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. A display panel, comprising: the array substrate comprises a color film layer arranged on a substrate and a first polarization layer arranged on one side, far away from the substrate, of the color film layer, the array substrate comprises a driving structure layer, a light emitting structure layer and a second polarization layer which are sequentially arranged, the first polarization layer comprises a plurality of first polarization units, the second polarization layer comprises a plurality of second polarization units, the first polarization units correspond to the second polarization units in a one-to-one mode, the polarization directions of the first polarization units and the second polarization units which correspond to each other are the same, the polarization directions of the adjacent first polarization units are different, the polarization directions of the adjacent second polarization units are different, and the orthographic projections of the first polarization units and the orthographic projections of the corresponding second polarization units are overlapped on a plane parallel to the substrate.
2. The display panel of claim 1, wherein an orthographic projection of the first polarization unit coincides with an orthographic projection of the corresponding second polarization unit on a plane parallel to the substrate.
3. The display panel according to claim 1, wherein the display panel comprises a plurality of sub-pixels, the sub-pixels are in one-to-one correspondence with a polarization unit group, the polarization unit group comprises a first polarization unit and a second polarization unit which are in correspondence with each other, and on a plane parallel to the substrate, an orthographic projection of a pixel opening area of each sub-pixel overlaps with an orthographic projection of the corresponding first polarization unit and overlaps with an orthographic projection of the corresponding second polarization unit.
4. The display panel according to claim 3, wherein an orthogonal projection of the pixel opening region of the sub-pixel is located within an orthogonal projection of the corresponding first and second polarization units and outside an orthogonal projection of the non-corresponding first and second polarization units on a plane parallel to the substrate.
5. The display panel according to claim 1, wherein adjacent first polarization units are connected to each other or there is a partial overlap; adjacent second polarization units are connected with each other, or are partially overlapped; the display panel comprises a plurality of sub-pixels, and on a plane parallel to the substrate, orthographic projections of overlapping regions of adjacent first polarization units are positioned outside orthographic projections of pixel opening regions of the sub-pixels, and orthographic projections of overlapping regions of adjacent second polarization units are positioned outside orthographic projections of pixel opening regions of the sub-pixels.
6. The display panel according to any one of claims 1 to 5, wherein the first polarizing layer has a thickness of 0.5 to 5 μm and the second polarizing layer has a thickness of 0.5 to 5 μm in a direction perpendicular to the substrate.
7. The display panel according to any one of claims 1 to 5, wherein the first polarizing layer comprises first polarizing units of a first polarization direction and first polarizing units of a second polarization direction, the first polarizing units of the first polarization direction and the first polarizing units of the second polarization direction being alternately arranged;
the second polarizing layer comprises a second polarizing unit with a first polarizing direction and a second polarizing unit with a second polarizing direction, and the second polarizing unit with the first polarizing direction and the second polarizing unit with the second polarizing direction are alternately arranged.
8. The display panel according to any one of claims 1 to 5, wherein an encapsulation layer is disposed between the light emitting structure layer and the second polarizing layer.
9. The display panel according to any one of claims 1 to 5, wherein the color film layer comprises a quantum dot material layer.
10. A display device comprising the display panel according to any one of claims 1 to 9.
11. A method for manufacturing a display panel, comprising:
forming a color film substrate, wherein the color film substrate comprises a color film layer arranged on a substrate and a first polarizing layer arranged on one side of the color film layer away from the substrate; the first polarizing layer comprises a plurality of first polarizing units, and the polarization directions of the adjacent first polarizing units are different;
forming an array substrate, wherein the array substrate comprises a driving structure layer, a light emitting structure layer and a second polarizing layer which are sequentially arranged, the second polarizing layer comprises a plurality of second polarizing units, the polarization directions of the adjacent second polarizing units are different, the second polarizing units correspond to the first polarizing units one by one, and the polarization directions of the first polarizing units and the second polarizing units which correspond to each other are the same;
and carrying out box alignment on the color film substrate and the array substrate, wherein the orthographic projection of the first polarization unit is overlapped with the orthographic projection of the corresponding second polarization unit on a plane parallel to the substrate.
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