Pixel arrangement structure, display panel, display device and mask group

Abstract

The utility model provides a pixel arrangement structure, a display panel, a display device and a mask group. The pixel arrangement structure comprises a plurality of basic pixel units which are arranged in an array mode, each basic pixel unit comprises a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel, and the first sub-pixel, the second sub-pixel and the third sub-pixel are sub-pixels of different colors. The third sub-pixel and the fourth sub-pixel are sub-pixels with the same color; one of the third sub-pixel and the fourth sub-pixel comprises a single light-emitting layer, the other one of the third sub-pixel and the fourth sub-pixel comprises at least two sub-light-emitting layers which are arranged in a laminated mode, and a charge generation layer is arranged between every two adjacent sub-light-emitting layers. According to the pixel arrangement structure, the problem of color cast of a white picture under low brightness after a reliability test is solved, and meanwhile, the problem of a dark field caused by extinguishment of some pixels can be eliminated, so that the display effect of the display panel is improved, and the yield and the product competitiveness of the display panel are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to display technical field generally, concretely relates to a pixel arrangement structure, display panel, display device and mask group. BACKGROUND

[0002] With the high demand of OLED device's luminous efficiency, the tandem light emitting device is widely used because the efficiency can be twice of single light emitting device of the same material composition. The contribution of green light efficiency to white light efficiency is the most in the tandem light emitting device, so improving the efficiency of green light material is the most critical factor. However, too high efficiency of green light material will also cause some problems, for example, after the display screen passes through the environmental reliability (lighting under high temperature and high humidity), the thin film transistor (TFT) is aged, the characteristics are offset, which may cause the leakage current to appear. In the same case of leakage current, the higher the efficiency of the light emitting material of the OLED device is, the higher the brightness is, so that the OLED display screen appears green after the environmental reliability test under low brightness white screen. SUMMARY

[0003] In view of the above defects or deficiencies in the prior art, it is desirable to provide a pixel arrangement structure, display panel, display device and mask group, by setting the same color sub-pixels as single light emitting layer sub-pixels and at least two sub-light emitting layer sub-pixels of the tandem, which is conducive to solving the color deviation phenomenon of white screen under low brightness after reliability test, and can also eliminate the dark field problem caused by the extinction of some part of the pixels, thereby improving the display effect of the display panel, improving the yield and product competitiveness of the display panel.

[0004] In a first aspect, the utility model provides a kind of pixel arrangement structure, including multiple array arrangement basic pixel units, each basic pixel unit includes first sub-pixel, second sub-pixel and third sub-pixel, fourth sub-pixel, first sub-pixel, second sub-pixel and third sub-pixel are different color sub-pixels, and third sub-pixel and fourth sub-pixel are same color sub-pixels;

[0005] One of third sub-pixel and fourth sub-pixel includes single light emitting layer, and the other includes at least two sub-light emitting layers arranged in tandem, and charge generation layer is arranged between adjacent two sub-light emitting layers.

[0006] As optional scheme, third sub-pixel and fourth sub-pixel are arranged side by side along the first direction or / second direction, and the first direction and the second direction are perpendicular.

[0007] As optional scheme, third sub-pixel and fourth sub-pixel are staggered.

[0008] As an optional solution, the thickness of the single light-emitting layer is the same as the sum of the thicknesses of the at least two sub-light-emitting layers arranged in a stack.

[0009] As an optional solution, the first sub-pixel is a red sub-pixel, the second sub-pixel is a blue sub-pixel, and the third sub-pixel and the fourth sub-pixel are both green sub-pixels.

[0010] Alternatively, the first sub-pixel is a blue sub-pixel, the second sub-pixel is a red sub-pixel, and the third sub-pixel and the fourth sub-pixel are both green sub-pixels.

[0011] As an optional solution, the number ratio of the red sub-pixel, the blue sub-pixel, and the green sub-pixel is 1:1:4.

[0012] As an optional solution, the number ratio of the third sub-pixel and the fourth sub-pixel is 1:1.

[0013] As an optional solution, the first sub-pixel, the second sub-pixel, and the third sub-pixel are of the same shape but different areas.

[0014] As an optional solution, the area of the first sub-pixel is smaller than the area of the second sub-pixel, and the area of the third sub-pixel and the fourth sub-pixel is larger than the area of the second sub-pixel.

[0015] As an optional solution, the third sub-pixel and the fourth sub-pixel are of the same shape and the same area.

[0016] In a second aspect, the utility model provides a kind of display panel, including the pixel arrangement structure of first aspect.

[0017] In a third aspect, the utility model provides a kind of display device, including the display panel of second aspect.

[0018] In a fourth aspect, the utility model provides a kind of mask group for manufacturing the pixel arrangement structure of first aspect, including first mask, second mask and third mask, wherein, multiple first openings are arranged in array on the first mask, and the first opening is used to form first sub-pixel;Multiple second openings are arranged in array on the second mask, and the second opening is used to form second sub-pixel;Multiple third openings are arranged in array on the third mask, and the third opening is used to form third sub-pixel and fourth sub-pixel.

[0019] As an optional solution, the third opening is arranged in parallel or staggered in the first direction or the second direction.

[0020] The utility model discloses a pixel arrangement structure, including a plurality of array arrangement basic pixel unit, and each basic pixel unit includes first subpixel, second subpixel and third subpixel, fourth subpixel, first subpixel, second subpixel and third subpixel are different color subpixels of each other, and third subpixel and fourth subpixel are the same color subpixel, one of third subpixel and fourth subpixel includes single light emitting layer, and another includes at least two sub light emitting layers of laminated arrangement, and the adjacent two sub light emitting layers are provided with charge generation layer. BRIEF DESCRIPTION OF DRAWINGS

[0021] Other features, objects, and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments thereof, read in conjunction with the accompanying drawings:

[0022] Figure 1 It is a cross-sectional schematic view of the prior art display panel of single layer structure;

[0023] Figure 2 It is a cross-sectional schematic view of the prior art display panel of laminated structure;

[0024] Figure 3 It is a schematic diagram of a pixel arrangement structure of the embodiment of the application;

[0025] Figure 4 It is Figure 3 It is a cross-sectional schematic view of A-A in the embodiment;

[0026] Figure 5 It is a schematic diagram of another pixel arrangement structure of the embodiment of the application;

[0027] Figure 6 It is Figure 5 It is a cross-sectional schematic view of B-B in the embodiment;

[0028] Figure 7 It is a structure principle diagram of the driving method of the display panel of the embodiment of the application;

[0029] Figure 8 A structural schematic diagram of a first mask plate of an embodiment of the present application;

[0030] Figure 9 A structural schematic diagram of a second mask plate of an embodiment of the present application;

[0031] Figure 10 A structural schematic diagram of a third mask plate of an embodiment of the present application;

[0032] Figure 11 A structural schematic diagram of another third mask plate of an embodiment of the present application.

[0033] In the drawings,

[0034] 100, display panel;

[0035] 10, basic pixel unit, 11, first sub-pixel, 12, second sub-pixel, 13, third sub-pixel, 14, fourth sub-pixel;

[0036] 20, substrate, 21, anode layer, 22, hole transport layer, 23, light-emitting layer, 231, first sub-light-emitting layer, 232, second sub-light-emitting layer, 24, hole blocking layer, 25, electron transport layer, 26, cathode layer, 27, encapsulation layer, 28, pixel definition layer, 29, electron injection layer, 30, hole injection layer;

[0037] 40, first mask plate, 41, first opening;

[0038] 50, second mask plate, 51, second opening;

[0039] 60, third mask plate, 61, third opening. DETAILED DESCRIPTION

[0040] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, and not to limit the present application. In addition, it should be noted that only parts related to the present application are shown in the drawings for the convenience of description.

[0041] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0042] The stacked organic electroluminescent device (TOLED) is a device in which two or more independent light-emitting units are connected in series through a charge generation layer (CGL). Each unit emits light independently, and compared with a single-layer light-emitting device, the stacked organic electroluminescent device can achieve higher brightness, higher current efficiency, and longer service life. The existing stacked device structure and single-layer device structure are shown in the following Figure 1 and Figure 2 , wherein the light-emitting unit of the single-layer device structure comprises an anode layer 21, a hole injection layer 30, a hole transport layer 22, a light-emitting layer 23, an electron transport layer 25, a hole blocking layer 24, an electron injection layer 29, and a cathode layer 26 which are sequentially stacked; and the light-emitting unit of the stacked device structure comprises an anode layer 21, a hole injection layer 30, a hole transport layer 22, a first sub-light-emitting layer 231, an N-type charge generation layer, a P-type charge generation layer, a second sub-light-emitting layer 232, an electron transport layer 25, a hole blocking layer 24, an electron injection layer 29, and a cathode layer 26 which are sequentially stacked. In the related art, the contribution of green light efficiency to white light efficiency in the stacked light-emitting device is the highest, so improving the efficiency of green light material is the most critical factor. However, too high efficiency of green light material can also cause some problems, for example, after the display screen passes the environmental reliability (lighting under high temperature and high humidity), the thin film transistor (TFT) is aged, the characteristics are shifted, and thus the leakage current can occur. In the same case of leakage current, the higher the efficiency of the light-emitting material of the OLED device, the higher the brightness, and thus the OLED display screen can have a greenish phenomenon in the white picture under low brightness after the environmental reliability test.

[0043] Based on the above problems, in a first aspect, embodiments of the present application provide a pixel arrangement structure, as shown in Figure 3 and Figure 5 , comprising a plurality of basic pixel units 10 arranged in an array, each basic pixel unit 10 comprising a first sub-pixel 11, a second sub-pixel 12, a third sub-pixel 13, and a fourth sub-pixel 14, the first sub-pixel 11, the second sub-pixel 12, and the third sub-pixel 13 being different colors of sub-pixels, and the third sub-pixel 13 and the fourth sub-pixel 14 being the same color of sub-pixels.

[0044] One of the third sub-pixel 13 and the fourth sub-pixel 14 comprises a single light-emitting layer 23, and the other comprises at least two sub-light-emitting layers which are stacked, and adjacent two sub-light-emitting layers are provided with a charge generation layer.

[0045] It can be understood that the OLED display panel is composed of a plurality of pixel repeating units, each pixel repeating unit includes three sub-pixels, i.e., an R sub-pixel (red sub-pixel), a G sub-pixel (green sub-pixel), and a B sub-pixel (blue sub-pixel), the more pixel repeating units arranged in the limited pixel area space, i.e., the higher the PPI (Pixel Per Inch, pixel density unit), the better the display effect of the OLED display panel. By adjusting the structure of each sub-pixel, the corresponding aperture size, and the arrangement mode between each pixel, it is beneficial to improve the display effect of the OLED and avoid display problems.

[0046] The basic pixel unit 10 in the embodiment of the present application is a repeating unit, and the basic pixel unit 10 is distributed in an array, i.e., the basic pixel unit 10 can be repeatedly arranged in the first direction and / or the second direction. It should be noted that the number of basic pixel units 10 in the embodiment of the present application is not limited, for example, the number of basic pixel units 10 in the first direction can be one, two or more than two; the number of basic pixel units 10 in the second direction can be one, two or more than two. The number of basic pixel units 10 in the first direction and the second direction can be equal or not equal, wherein the first direction can be the horizontal direction of the entire pixel arrangement structure (such as the X direction in Figure 3 The second direction can be the vertical direction of the entire pixel arrangement structure (such as the Y direction in Figure 3 of course, in some other embodiments, the first direction and the second direction can also be the diagonal direction of the entire pixel arrangement structure.

[0047] It can be understood that the color of the first sub-pixel 11, the color of the second sub-pixel 12, and the color of the third sub-pixel 13 are different, the color of the third sub-pixel 13 and the color of the fourth sub-pixel 14 are the same, i.e., the color of the fourth sub-pixel 14 and the color of the first sub-pixel 11, the color of the second sub-pixel 12 are different; the third sub-pixel 13 and the fourth sub-pixel 14 can be red sub-pixels, green sub-pixels or blue sub-pixels, which are determined according to the actual demand for the product.

[0048] The third sub-pixel 13 can include a single light-emitting layer 23, and the fourth sub-pixel 14 can include at least two sub-light-emitting layers arranged in a stack, and a charge generation layer is arranged between the adjacent two sub-light-emitting layers, that is, the third sub-pixel 13 is a single-layer structure (single) sub-pixel, the fourth sub-pixel 14 is a stack (Tandem) structure sub-pixel, and the light-emitting efficiency of the fourth sub-pixel 14 is higher than that of the third sub-pixel 13. Of course, the fourth sub-pixel 14 can also include a single light-emitting layer 23, and the third sub-pixel 13 can include at least two sub-light-emitting layers arranged in a stack, and a charge generation layer is arranged between the adjacent two sub-light-emitting layers, that is, the fourth sub-pixel 14 is a single-layer structure sub-pixel, and the light-emitting efficiency of the third sub-pixel 13 is higher than that of the fourth sub-pixel 14. It can also be understood that, since the color of the third sub-pixel 13 and the color of the fourth sub-pixel 14 are the same, the materials of the light-emitting layer 23 and the sub-light-emitting layer can be the same, of course, they can also be different. In the preferred embodiment, the materials of the light-emitting layer 23 and the sub-light-emitting layer are the same, which is conducive to convenient processing.

[0049] In actual use, since the single-layer structure sub-pixel and the stack structure sub-pixel each have different advantages, in the embodiment of the present application, the sub-pixels of the same color are arranged as single-layer structure sub-pixels and stack structure sub-pixels, which is conducive to controlling one of the third sub-pixel 13 and the fourth sub-pixel 14 to be lit and the other to be extinguished according to actual product requirements. For example, by controlling the single-layer structure sub-pixel to be extinguished under low brightness requirement and to be lit under high brightness requirement, and the stack structure sub-pixel to be lit under low brightness requirement and to be extinguished under high brightness requirement, the color mixing problem can be improved. For another example, by controlling the single-layer structure sub-pixel to be lit under low brightness requirement and to be extinguished under high brightness requirement, and the stack structure sub-pixel to be lit under low brightness requirement and to be lit under high brightness requirement, the light-emitting efficiency can be improved.

[0050] It can also be understood that, in the related art, when the stack structure sub-pixel is evaporated, since the thickness of the sub-light-emitting layer in the stack structure is halved compared with the thickness of the light-emitting layer 23 in the single-layer structure, the photoluminescence brightness of the sub-light-emitting layer is low, which may cause deviation when the second sub-light-emitting layer is evaporated, and easily cause the problem of color mixing failure, or in order to avoid the problem of color mixing failure, the backlight module needs to be additionally improved to ensure accurate alignment. In the embodiment of the present application, the sub-pixels of the same color are arranged as single-layer structure sub-pixels and stack structure sub-pixels, so that when the stack structure is evaporated, the single-layer structure sub-pixel can improve the alignment of the second sub-light-emitting layer, thereby ensuring good color mixing effect.

[0051] It should be noted that the charge generation layer can include an N-type charge generation layer containing N-type dopants and a P-type charge generation layer containing P-type dopants, the N-type charge generation layer is mainly used to generate electrons under the action of an applied electric field, and the P-type charge generation layer is mainly used to generate holes under the action of an applied electric field. In this way, the electrons and holes generated by the charge generation layer are combined with the holes injected from the anode and the electrons injected from the cathode in the light-emitting layer to emit light, so that the light-emitting device can achieve high brightness, high efficiency, long service life and the like at low current density. For example, as shown in Figure 4 The third sub-pixel 13 includes two sub-light-emitting layers stacked, and a charge generation layer is arranged between the two sub-light-emitting layers. The holes moving in the direction close to the cathode generated by the charge generation layer recombine with the electrons provided by the cathode into excitons in the first sub-light-emitting layer located on the side close to the cathode of the charge generation layer, so that the first sub-light-emitting layer emits light. The electrons moving in the direction close to the anode generated by the charge generation layer recombine with the holes provided by the anode into excitons in the second sub-light-emitting layer located on the other side close to the anode of the charge generation layer, so that the second sub-light-emitting layer emits light, thereby realizing the light-emission of the sub-pixel with a stacked structure.

[0052] The pixel arrangement structure of the embodiment of the present application solves the color deviation problem of the white screen after the reliability test in the prior art. The pixel arrangement structure of the embodiment of the present application is advantageous in that the sub-pixels of the same color are respectively arranged as the sub-pixels of the single-layer light-emitting layer 23 and the sub-pixels of the stacked sub-light-emitting layer, so as to facilitate the control of the lighting of one of the sub-pixels of the single-layer light-emitting layer 23 and the sub-pixels of the stacked sub-light-emitting layer and the extinguishing of the other according to the actual needs in actual use, thereby facilitating the elimination of the dark field problem caused by the extinguishing of some sub-pixels; on the one hand, the high capacitance of the sub-pixel with a stacked structure is advantageous in solving the color deviation phenomenon of the white screen at low brightness after the reliability test, while ensuring that the light-emitting device has high light-emitting efficiency, which is advantageous in improving the display effect of the display panel; on the other hand, the sub-pixels of the single-layer light-emitting layer 23 and the sub-pixels of the stacked sub-light-emitting layer can also solve the problem of poor color mixing in the evaporation process, improve the product quality, and further improve the product quality and product competitiveness of the display panel.

[0053] As a realizable manner, the third sub-pixel 13 and the fourth sub-pixel 14 are arranged side by side along the first direction or / the second direction, and the first direction and the second direction are perpendicular.

[0054] The first direction and the second direction are as described above, the first direction can be the horizontal direction of the entire pixel arrangement structure (such as the X direction in Figure 3 ), and the second direction can be the vertical direction of the entire pixel arrangement structure (such as the Y direction in Figure 3 ).

[0055] The number of the third sub-pixel 13 and the fourth sub-pixel 14 can be one, two, or more than two, respectively. Of course, the specific number is determined according to actual product requirements and actual processing technology. For example, there can be two third sub-pixels 13 and two fourth sub-pixels 14.

[0056] Among them, the third sub-pixel 13 and the fourth sub-pixel 14 are arranged side by side in the first direction or the second direction, which can be understood as the third sub-pixel 13 and the fourth sub-pixel 14 are arranged side by side in the horizontal direction of the entire pixel arrangement structure, or the third sub-pixel 13 and the fourth sub-pixel 14 are arranged side by side in the vertical direction of the entire pixel arrangement structure.

[0057] In this embodiment, the arrangement of the third sub-pixel 13 and the fourth sub-pixel 14 has a simple structure and is easy to manufacture, which is beneficial to reducing process requirements and saving manufacturing costs.

[0058] As an achievable method, Figure 5 As shown, the third sub-pixel 13 and the fourth sub-pixel 14 are arranged alternately.

[0059] It can be understood that the staggered arrangement of the third sub-pixel 13 and the fourth sub-pixel 14 means that the third sub-pixel 13 and the fourth sub-pixel 14 are located in different rows or columns in the first direction or the second direction. Figure 5 As shown, along the first direction, the third sub-pixel 13 is located in the first column, and the fourth sub-pixel 14 is located in the second column. Of course, along the first direction, the third sub-pixel 13 can also be located in the second column, and the fourth sub-pixel 14 can be located in the first column.

[0060] In some embodiments, the thickness of a single light-emitting layer 23 is the same as the sum of the thicknesses of at least two stacked sub-light-emitting layers 23 .

[0061] This embodiment is beneficial to the processing of the third sub-pixel 13 and the fourth sub-pixel 14 , and can also improve the luminous efficiency of the light-emitting device and avoid problems such as color mixing and color cast.

[0062] In some embodiments, the first sub-pixel 11 is a red sub-pixel, the second sub-pixel 12 is a blue sub-pixel, and the third sub-pixel 13 and the fourth sub-pixel 14 are both green sub-pixels.

[0063] In some other embodiments, the first sub-pixel 11 is a blue sub-pixel, the second sub-pixel 12 is a red sub-pixel, and the third sub-pixel 13 and the fourth sub-pixel 14 are both green sub-pixels.

[0064] The third sub-pixel 13 and the fourth sub-pixel 14 are green sub-pixels in this embodiment. In this way, by changing the pixel structure and arrangement of the green sub-pixels, the color cast phenomenon of the white picture at low brightness after the reliability test of the display panel can be solved, and the dark field problem caused by the extinction of some partial pixels can also be eliminated.

[0065] As an implementation manner, the number ratio of the red sub-pixels, the blue sub-pixels and the green sub-pixels is 1:1:4.

[0066] The number of the third sub-pixels 13 corresponding to the green sub-pixels and the number of the fourth sub-pixels 14 can be equal or not equal.

[0067] In this embodiment, the number of the red sub-pixels, the blue sub-pixels and the green sub-pixels can be reliably solved the color cast phenomenon of the white picture at low brightness after the reliability test of the display panel by lighting the partial sub-pixels of the green sub-pixels, and the low gray scale quality uniformity can be realized while the display effect of the light emitting device is guaranteed.

[0068] In a preferred embodiment, the number ratio of the third sub-pixels 13 and the fourth sub-pixels 14 is 1:1.

[0069] The number of the third sub-pixels 13 and the fourth sub-pixels 14 is equal in this embodiment, that is, the number of the single-layer structure sub-pixels and the number of the stacked structure sub-pixels of the same color sub-pixels are equal. In this way, the light emitting efficiency of the light emitting device can be guaranteed, and the color mixing of the light emitting device and the color cast phenomenon of the white picture at low brightness after the reliability test can be solved.

[0070] As an implementation manner, the first sub-pixel 11, the second sub-pixel 12 and the third sub-pixel 13 have the same shape and different areas.

[0071] The shape of the first sub-pixel 11, the second sub-pixel 12 and the third sub-pixel 13 respectively refers to the shape of the orthographic projection of the first sub-pixel 11, the second sub-pixel 12 and the third sub-pixel 13 respectively (for example, in the display panel, it can be the shape of the orthographic projection of the first sub-pixel 11, the second sub-pixel 12 and the third sub-pixel 13 on the substrate 20 respectively). Similarly, the area of the first sub-pixel 11, the second sub-pixel 12 and the third sub-pixel 13 refers to the area of the orthographic projection of the first sub-pixel 11, the second sub-pixel 12 and the third sub-pixel 13 (for example, in the display panel, it can be the shape of the orthographic projection of the first sub-pixel 11, the second sub-pixel 12 and the third sub-pixel 13 on the substrate 20 respectively).

[0072] It can be understood that the first sub-pixel 11, the second sub-pixel 12 and the third sub-pixel 13 can be, but are not limited to, a rectangle, a rounded rectangle, an ellipse, a circle and the like. Of course, the shape and area of the third sub-pixel 13 and the shape and area of the fourth sub-pixel 14 can be the same or different.

[0073] The present embodiment is advantageous in facilitating the processing of each sub-pixel, ensuring the light-emitting efficiency and ensuring that each sub-pixel has a relatively high light-emitting life.

[0074] In some embodiments, the area of the first sub-pixel 11 is smaller than the area of the second sub-pixel 12, and the area of the third sub-pixel 13 and the fourth sub-pixel 14 is greater than the area of the second sub-pixel 12.

[0075] For example, the first sub-pixel 11 is a red sub-pixel, the second sub-pixel 12 is a blue sub-pixel, and the third sub-pixel 13 and the fourth sub-pixel 14 are green sub-pixels. In the present embodiment, the area of the second sub-pixel 12 is greater than the area of the first sub-pixel 11, and the area of the third sub-pixel 13 and the fourth sub-pixel 14 is greater than the area of the second sub-pixel 12, which is advantageous for sub-pixel rendering, thereby improving the display effect of the display panel. In addition, the area of the blue sub-pixel is large, which can reduce the current density through the blue sub-pixel, thereby reducing the life decay of the blue sub-pixel.

[0076] In some embodiments, the third sub-pixel 13 and the fourth sub-pixel 14 have the same shape and the same area.

[0077] In the present embodiment, the sub-pixels of the same color have the same shape and area, which is advantageous for ensuring the light-emitting effect of the sub-pixels of the same color, and the same mask can be used to manufacture the sub-pixels, which is convenient for processing and is advantageous for improving the production and processing efficiency.

[0078] For example, the third sub-pixel 13 and the fourth sub-pixel 14 are both rounded rectangles, and the area of the third sub-pixel 13 and the fourth sub-pixel 14 can be processed using the same mask.

[0079] In summary, in the pixel arrangement structure of the embodiments of the present application, the sub-pixels of the same color are respectively arranged as the sub-pixels of the single-layer light-emitting layer 23 and the sub-pixels of the stacked sub-light-emitting layer, which is conducive to controlling one of the sub-pixels of the single-layer light-emitting layer 23 and the sub-pixels of the stacked sub-light-emitting layer to be lighted and the other to be extinguished according to actual needs in actual use, thereby eliminating the dark field problem that may be caused by the extinction of some sub-pixels; on the one hand, the high capacitance of the sub-pixels with the stacked structure can solve the color deviation of the white picture under low brightness after the reliability test, while ensuring that the light-emitting device has high light-emitting efficiency, thereby improving the display effect of the display panel; on the other hand, the sub-pixels of the single-layer light-emitting layer 23 and the sub-pixels of the stacked sub-light-emitting layer can also solve the problem of poor color mixing in the evaporation process, improve the product quality, and further improve the product quality and product competitiveness of the display panel.

[0080] In addition, the third sub-pixel 13 and the fourth sub-pixel 14 can be arranged side by side or staggered, and the arrangement mode is flexible, which is conducive to reducing the process requirement and saving the processing cost.

[0081] In a second aspect, the embodiments of the present application provide a display panel 100 comprising the pixel arrangement structure of the first aspect. It can be understood that the display panel has all the features and advantages of the pixel arrangement structure described above, and will not be repeated here. In summary, the display panel has high quality and yield, and good display effect.

[0082] Embodiment 1

[0083] As shown in Figure 3 , the display panel comprises a plurality of arrayed basic pixel units 10, each basic pixel unit 10 comprising one first sub-pixel 11, one second sub-pixel 12, two third sub-pixels 13 and two fourth sub-pixels 14. The cross-sectional view along the first direction is shown in Figure 4 , the display panel comprises a substrate 20, a driving layer arranged on the substrate 20, and a pixel definition layer 28 arranged on the side of the driving layer away from the substrate 20, the pixel definition layer 28 defining a pixel opening area, wherein each pixel opening area is formed with an anode layer 21 (Anode), a hole transport layer 22 (HTL), an emitting layer 23 (EML), a hole blocking layer 24 (HBL), an electron transport layer 25 (ETL), and a cathode layer 26 (CA) on the side away from the substrate 20, and the cathode layer 26 is provided with an encapsulation layer 27 on the side away from the substrate 20; wherein the third sub-pixel 13 comprises a first sub-light-emitting layer 231 and a second sub-light-emitting layer 232 arranged in a stack, that is, the third sub-pixel 13 comprises an anode layer 21, a hole transport layer 22, a first sub-light-emitting layer 231, a hole blocking layer 24, an N-type charge generation layer, a P-type charge generation layer, a second sub-light-emitting layer 232, a hole blocking layer 24, an electron transport layer 25 and a cathode layer 26 arranged in the direction away from the substrate 20.

[0084] Embodiment 2

[0085] Different from embodiment 1, in this embodiment, as shown in FIG. 2, the third sub-pixel 13 and the fourth sub-pixel 14 are staggered arranged, that is, the third sub-pixel 13 is respectively located at the position of the first row and the first column and the position of the second row and the second column along the first direction, and the fourth sub-pixel 14 is respectively located at the position of the first row and the second column and the position of the second row and the first column along the first direction. The cross-sectional structure of the display panel along the second direction is shown in FIG. 3, wherein the structures of the third sub-pixel 13 and the fourth sub-pixel 14 are the same as those in embodiment 1. Figure 5 Figure 6

[0086] In a third aspect, embodiments of the present application provide a driving method of a display panel, which is used to drive the display panel in the second aspect to light up, and the driving method comprises the following steps:

[0087] In step S10, an input voltage signal is obtained.

[0088] In step S20, based on the frequency of the input voltage signal, one of the third sub-pixel 13 and the fourth sub-pixel 14 is controlled to light up, and the other is controlled to extinguish.

[0089] It can be understood that the driving method of the display panel in the embodiments of the present application can be executed by a control system of the display panel, the first sub-pixel 11, the second sub-pixel 12, the third sub-pixel 13 and the fourth sub-pixel 14 are respectively connected to a pixel driving circuit, the control system is signal connected to the pixel driving circuit, the control system obtains the input voltage signal, and according to the frequency of the input voltage signal, a GOA circuit outputs a signal to the pixel driving circuit, thereby controlling one of the third sub-pixel 13 and the fourth sub-pixel 14 to light up and the other to extinguish.

[0090] In some embodiments, according to actual needs, one of the third sub-pixel 13 and the fourth sub-pixel 14 is determined to light up at low brightness and to extinguish at high brightness, and two sets of gamma curves are respectively burned into the third sub-pixel 13 and the fourth sub-pixel 14 together with the first sub-pixel 11 and the second sub-pixel 12, corresponding to high brightness and low brightness, and the demarcation line between high brightness and low brightness can be 90 nits. In this way, according to different needs, the control system outputs a GOA signal to the pixel driving circuit according to the frequency of the obtained input voltage signal, and the pixel driving circuit controls one of the third sub-pixel 13 and the fourth sub-pixel 14 to light up and the other to extinguish.

[0091] As shown in FIG. 4, the display panel comprises a control system 40 and a display panel 41. Figure 7 ​​As shown, the voltage signal is output to the driving circuit through the GOA according to the input voltage signal, one of the third sub-pixel 13 and the fourth sub-pixel 14 is controlled to be lighted, and the other one is controlled to be extinguished, and the input signal is transmitted layer by layer as the next layer. For example, in order to improve the color deviation problem of the white picture under low brightness after the reliability test, the sub-pixel circuit including the stacked structure in the third sub-pixel 13 and the fourth sub-pixel 14 can be controlled to be lighted below 90 nit through the GOA output voltage signal, and the sub-pixel including the single layer structure is lighted above 90 nit; of course, in order to ensure the uniformity of low gray scale picture quality, the sub-pixel circuit including the stacked structure in the third sub-pixel 13 and the fourth sub-pixel 14 can be controlled to be lighted above 90 nit through the GOA output voltage signal, and the sub-pixel including the single layer structure is lighted below 90 nit, which is beneficial to higher brightness of the product.

[0092] As a realizable way, step S20, based on the frequency of the input voltage signal, controls one of the third sub-pixel 13 and the fourth sub-pixel 14 to be lighted, and the other one to be extinguished, including:

[0093] When the frequency of the input voltage signal is lower than the preset threshold, one of the third sub-pixel 13 and the fourth sub-pixel 14 including the single light-emitting layer 23 is controlled to be lighted, and the other one including the at least two sub-light-emitting layers arranged in a stacked manner is controlled to be extinguished;

[0094] When the frequency of the input voltage is higher than or equal to the preset threshold, one of the third sub-pixel 13 and the fourth sub-pixel 14 including the single light-emitting layer 23 is controlled to be extinguished, and the other one including the at least two sub-light-emitting layers arranged in a stacked manner is controlled to be lighted.

[0095] The preset threshold is determined in advance according to actual needs, for example, but not limited to, 50 Hz, etc.

[0096] In this embodiment, by controlling the sub-pixel including the stacked structure in the third sub-pixel 13 and the fourth sub-pixel 14 to be lighted under the high-frequency voltage signal, and controlling the sub-pixel including the single layer structure to be lighted under the low-frequency voltage signal, and ensuring that only one of the third sub-pixel 13 and the fourth sub-pixel 14 is lighted at a time, and the other one is extinguished, the color deviation problem of the white picture under low brightness after the reliability test is solved, and the display panel has a higher light-emitting efficiency.

[0097] In some other embodiments, step S20, based on the frequency of the input voltage signal, controls one of the third sub-pixel 13 and the fourth sub-pixel 14 to be lighted, and the other one to be extinguished, including:

[0098] When the frequency of the input voltage signal is lower than or equal to a preset threshold, one of the third sub-pixel 13 and the fourth sub-pixel 14 including a single light-emitting layer 23 is controlled to light up, and the other sub-pixel including at least two stacked light-emitting sub-layers is controlled to turn off;

[0099] When the frequency of the input voltage is higher than a preset threshold, one of the third and fourth sub-pixels 13 and 14 including a single light-emitting layer 23 is controlled to be extinguished, and another sub-pixel including at least two stacked sub-light-emitting layers is controlled to be lit.

[0100] In a fourth aspect, the present invention provides a display device comprising the display panel of the third aspect. It is understood that this display device possesses all the features and advantages of the aforementioned display panels, which will not be elaborated upon here. In summary, this display device has high quality and yield, and provides excellent display effects.

[0101] A display device is a product with an image display function. For example, a display device can be any of: a display, a television, a billboard, a digital photo frame, a laser printer with a display function, a telephone, a mobile phone, a personal digital assistant (PDA), a digital camera, a camcorder, a viewfinder, a navigator, a vehicle, a large-area wall, a home appliance, an information query device (such as business query equipment for e-government, banks, hospitals, power departments, etc.), a monitor, etc. The display device can also be a microdisplay or a product containing a microdisplay. A product containing a microdisplay can be any of a smart watch, a smart bracelet, a helmet display, a stereo display mirror, and an AR device (such as AR glasses), a VR device (such as VR glasses), etc. For example, a microdisplay can be a display with a display size ranging from about 0.2 inches to about 2.5 inches, but is not limited thereto. It can be understood that the microdisplay can also be a display with a smaller display size, such as a display size less than or equal to 0.2 inches.

[0102] Fifthly, Figures 8-11 As shown, an embodiment of the present application provides a mask set for producing the pixel arrangement structure of the first aspect, including a first mask 40, a second mask 50 and a third mask 60, wherein the first mask 40 is provided with a plurality of first openings 41 arranged in an array, and the first openings 41 are used to form a first sub-pixel 11; the second mask 50 is provided with a plurality of second openings 51 arranged in an array, and the second openings 51 are used to form a second sub-pixel 12; the third mask 60 is provided with a plurality of third openings 61 arranged in an array, and the third openings 61 are used to form a third sub-pixel 13 and a fourth sub-pixel 14.

[0103] It can be understood that the first mask 40 and the second mask 50 are used to respectively manufacture the first sub-pixel 11 and the second sub-pixel 12 by evaporation, and the third mask 60 can be used to manufacture the third sub-pixel 13 and the fourth sub-pixel 14 by evaporation, so as to obtain the pixel arrangement structure of the embodiment of the application.

[0104] It should be noted that the third sub-pixel 13 and the fourth sub-pixel 14 can share a third opening 61, of course, the third opening 61 can also include an opening for manufacturing the third sub-pixel 13 and an opening for manufacturing the fourth sub-pixel 14, which is determined according to the actual processing process.

[0105] The first mask 40, the second mask and the third mask 60 are precision metal masks, in the preparation of the display panel, different color organic light emitting materials are evaporated to form corresponding sub-pixels, and the third sub-pixel 13 and the fourth sub-pixel 14 are respectively formed by evaporating single-layer light emitting materials and laminated light emitting materials through the third opening 61; in addition, the shapes and areas of the first opening 41, the second opening 51 and the third opening 61 are the same as the shapes and areas of the first sub-pixel 11, the second sub-pixel 12, the third sub-pixel and the fourth sub-pixel 14, the larger the opening, the lower the current density of the corresponding sub-pixel, which is beneficial to improve the service life of the display panel, and the smaller the opening, the smaller the area of the single sub-pixel, which is beneficial to improve the resolution of the display panel.

[0106] In some embodiments, the third openings 61 are arranged in parallel or staggered in the first direction or the second direction.

[0107] In the embodiment, the arrangement mode of the third opening 61 is beneficial to the arrangement mode of the third sub-pixel 13 and the fourth sub-pixel 14 formed correspondingly in different arrangements.

[0108] It should be understood that the above-mentioned terms such as "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the panel or the element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise stated, the meaning of "multiple" is two or more.

[0109] The above description is merely the preferred embodiments of the present application and the technical principles used. It should be understood by those skilled in the art that the scope of the utility model involved in the present application is not limited to the technical solutions formed by the specific combinations of the technical features described above, and should also cover other technical solutions formed by any combinations of the technical features described above or their equivalent features without departing from the concept of the utility model. For example, the technical solutions formed by replacing the above features with the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. Pixel arrangement structure, characterized in that: comprising a plurality of basic pixel units arranged in an array, each of the basic pixel units comprising a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel, wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel are sub-pixels of different colors, and the third sub-pixel and the fourth sub-pixel are sub-pixels of the same color; One of the third sub-pixel and the fourth sub-pixel includes a single light-emitting layer, and the other includes at least two stacked sub-light-emitting layers, with a charge generation layer disposed between two adjacent sub-light-emitting layers.

2. The pixel arrangement structure according to claim 1, characterized in that: The third sub-pixel and the fourth sub-pixel are arranged in parallel along a first direction or / and a second direction, and the first direction is perpendicular to the second direction.

3. The pixel arrangement structure according to claim 1, wherein: The third sub-pixel and the fourth sub-pixel are arranged in an alternating manner.

4. The pixel arrangement structure according to claim 1, wherein: The thickness of the single light-emitting layer is the same as the sum of the thicknesses of the at least two stacked sub-light-emitting layers.

5. The pixel arrangement structure according to any one of claims 1 to 4, characterized in that: The first sub-pixel is a red sub-pixel, the second sub-pixel is a blue sub-pixel, and the third sub-pixel and the fourth sub-pixel are both green sub-pixels; Alternatively, the first sub-pixel is a blue sub-pixel, the second sub-pixel is a red sub-pixel, and the third sub-pixel and the fourth sub-pixel are both green sub-pixels.

6. The pixel arrangement structure according to claim 5, wherein: The ratio of the number of the red sub-pixels, the blue sub-pixels, and the green sub-pixels is 1:1:

4.

7. The pixel arrangement structure according to claim 6, wherein: The ratio of the number of the third sub-pixels to the number of the fourth sub-pixels is 1:

1.

8. The pixel arrangement structure according to any one of claims 1 to 4, characterized in that: The first sub-pixel, the second sub-pixel, and the third sub-pixel have the same shape but different areas.

9. The pixel arrangement structure according to claim 8, wherein: The area of ​​the first sub-pixel is smaller than that of the second sub-pixel, and the sum of the areas of the third sub-pixel and the fourth sub-pixel is larger than that of the second sub-pixel.

10. The pixel arrangement structure according to any one of claims 1 to 4, characterized in that: The third sub-pixel and the fourth sub-pixel have the same shape and the same area.

11. A display panel, characterized in that The pixel arrangement structure comprises the pixel arrangement structure according to any one of claims 1 to 10.

12. A display device, characterized in that The display panel according to claim 11 is included.

13. A mask set for manufacturing the pixel arrangement structure according to any one of claims 1 to 10, characterized in that: The invention comprises a first mask plate, a second mask plate and a third mask plate, wherein the first mask plate is provided with a plurality of first openings arranged in an array, and the first openings are used to form the first sub-pixel; the second mask plate is provided with a plurality of second openings arranged in an array, and the second openings are used to form the second sub-pixel; the third mask plate is provided with a plurality of third openings arranged in an array, and the third openings are used to form the third sub-pixel and the fourth sub-pixel, and the third sub-pixel and the fourth sub-pixel are arranged side by side along the first direction or / and the second direction, and the first direction is perpendicular to the second direction.

14. The mask set according to claim 13, wherein: The third openings are arranged in parallel or staggered in the first direction or the second direction.

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