CN113707696A

CN113707696A - Display substrate, mask and display device

Info

Publication number: CN113707696A
Application number: CN202110990331.4A
Authority: CN
Inventors: 祝文秀; 赵辉
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2021-08-26
Filing date: 2021-08-26
Publication date: 2021-11-26
Anticipated expiration: 2041-08-26

Abstract

The invention provides a display substrate, a mask and a display device, and relates to the technical field of display. The light-emitting layers of adjacent same-color sub-pixels in adjacent pixel units of the display substrate are of an integral structure; in the pixel units, the area occupied by the first sub-pixel is the largest, four pixel units arranged in two rows and two columns are a pixel unit group, and in the pixel unit group, the first sub-pixel in each pixel unit is arranged close to the geometric center of the pixel unit group in which the first sub-pixel is located. In the invention, adjacent same-color sub-pixels in adjacent pixel units can be formed through one mask pattern opening, and for the first sub-pixel with the largest proportion, the light emitting layers of four first sub-pixels can be formed through one mask pattern opening.

Description

Display substrate, mask and display device

Technical Field

The invention relates to the technical field of display, in particular to a display substrate, a mask and a display device.

Background

With the rapid development of display technology, the resolution of the display screen is required to be higher and higher, and the current Pixel arrangement mode aiming at high resolution is the color borrowing mode (SPR), as shown in fig. 1 and fig. 2. The adjacent pixel units 01 share the R (red) sub-pixel or the B (blue) sub-pixel. However, the pixel arrangement results in different widths of bright and dark lines and insufficient physical resolution.

The Real RGB pixel arrangement can solve the problems of the SPR algorithm at present, and fig. 3 shows an existing Real RGB pixel arrangement, in which the sub-pixels are not shared by the pixel unit 01. However, when sub-pixels are deposited by FMM (Fine Metal Mask), the sub-pixel pitch is required to be not too small due to the accuracy of FMM, and thus when the Real RGB pixel arrangement method is used for high resolution display, the aperture ratio of the sub-pixels is drastically reduced, and parameters such as the lifetime of a display screen are also drastically reduced.

Disclosure of Invention

The invention provides a display substrate, a mask and a display device, and aims to solve the problems that when the conventional Real RGB pixel arrangement mode is used for high-resolution display, the aperture ratio of a sub-pixel is rapidly reduced, and the service life and other parameters of a display screen are greatly reduced.

In order to solve the above problems, the present invention discloses a display substrate, which comprises a plurality of pixel units arranged in an array, wherein the light emitting layers of adjacent same-color sub-pixels in adjacent pixel units are of an integral structure;

in the pixel units, the area occupied by first sub-pixels of a first color is the largest, four pixel units arranged in two rows and two columns are a pixel unit group, the pixel unit groups are arranged in an array mode, and in the pixel unit group, the first sub-pixels in each pixel unit are arranged close to the geometric center of the pixel unit group where the first sub-pixels are located.

Optionally, the shape of the first sub-pixel comprises at least one right-angled vertex, and the right-angled vertex is arranged near a geometric center of the pixel unit group where the first sub-pixel is located.

Optionally, the first sub-pixel is shaped as a right triangle, and a right-angled vertex of the right triangle is disposed near a geometric center of the pixel unit group in which the first sub-pixel is located.

Optionally, the right triangle is an isosceles right triangle.

Optionally, the first sub-pixel has a shape of 1/2 arch, and a right-angled vertex of the 1/2 arch is disposed near a geometric center of the pixel cell group in which the first sub-pixel is located.

Optionally, the 1/2 arch is a 1/2 semi-circular arch.

Optionally, the first sub-pixel is shaped as a rectangle, and any right-angle vertex of the rectangle is disposed near a geometric center of the pixel unit group where the first sub-pixel is located.

Optionally, the rectangle is a square.

Optionally, the pixel unit further includes a second sub-pixel of the second color and a third sub-pixel of a third color.

Optionally, the first sub-pixel of the first color is a blue sub-pixel, the second sub-pixel of the second color is a red sub-pixel, and the third sub-pixel of the third color is a green sub-pixel.

In order to solve the above problems, the present invention further discloses a mask for preparing the display substrate, wherein the mask comprises a plurality of discrete mask pattern openings, and the mask pattern openings are used for forming light emitting layers of adjacent same-color sub-pixels in adjacent pixel units.

Optionally, the same-color sub-pixel is a blue sub-pixel.

Optionally, the same-color sub-pixel is a red sub-pixel.

Optionally, the same-color sub-pixel is a green sub-pixel.

In order to solve the above problem, the present invention further discloses a display device including the above display substrate.

Compared with the prior art, the invention has the following advantages:

in the embodiment of the invention, the light emitting layers of the adjacent same-color sub-pixels in the adjacent pixel units are of an integral structure, so that the light emitting layers of the four first sub-pixels can be formed through one mask pattern opening during preparation, and for the first sub-pixel of the first color with the largest area ratio, the light emitting layers of the four first sub-pixels can be formed through one mask pattern opening, so that the size of the mask pattern opening on the mask plate can be increased, the gap between the adjacent sub-pixels can be reduced, and the gap between the adjacent sub-pixels is not limited by the precision of the mask plate, thereby improving the resolution and the aperture ratio of the display substrate. In addition, in the embodiment of the invention, the light emitting layers of at least two sub-pixels are of an integrated structure, namely, at least two sub-pixels can be prepared by one mask pattern opening of the mask, so that the precision requirement of the mask is reduced, the evaporation process difficulty of the sub-pixels is further reduced, the yield of the display device is correspondingly improved, and the service life and other parameters of the display device are correspondingly improved.

Drawings

Fig. 1 is a schematic diagram of a pixel arrangement of a conventional display substrate;

FIG. 2 is a schematic diagram of a pixel arrangement of another conventional display substrate;

FIG. 3 is a schematic diagram of a pixel arrangement of another conventional display substrate;

fig. 4 is a schematic diagram illustrating a pixel arrangement of a display substrate according to a first embodiment of the invention;

FIG. 5 is a schematic diagram of a pixel layout of another display substrate according to the first embodiment of the invention;

fig. 6 is a schematic view illustrating a pixel arrangement of a third display substrate according to a first embodiment of the invention;

fig. 7 is a schematic view illustrating a pixel arrangement of a fourth display substrate according to a first embodiment of the invention;

fig. 8 is a schematic view illustrating a pixel arrangement of a fifth display substrate according to a first embodiment of the invention;

fig. 9 is a schematic view showing a pixel arrangement of a sixth display substrate according to a first embodiment of the invention;

fig. 10 is a schematic view illustrating a pixel arrangement of a seventh display substrate according to the first embodiment of the invention;

fig. 11 is a schematic view illustrating a pixel arrangement of an eighth display substrate according to a first embodiment of the invention;

fig. 12 is a schematic view illustrating a pixel arrangement of a ninth display substrate according to a first embodiment of the invention;

fig. 13 is a schematic view showing a pixel arrangement of a tenth display substrate according to the first embodiment of the present invention;

fig. 14 is a schematic view showing a pixel arrangement of an eleventh display substrate according to a first embodiment of the present invention;

fig. 15 is a schematic view illustrating a pixel arrangement of a twelfth display substrate according to the first embodiment of the invention;

fig. 16 is a schematic view showing a pixel arrangement of a thirteenth display substrate according to the first embodiment of the present invention;

fig. 17 is a schematic view illustrating a pixel arrangement of a fourteenth display substrate according to a first embodiment of the invention;

fig. 18 is a schematic view showing a pixel arrangement of a fifteenth display substrate according to the first embodiment of the present invention;

FIG. 19 is a schematic view of a reticle according to the second embodiment of the present invention;

FIG. 20 is a schematic view of another reticle according to the second embodiment of the present invention;

fig. 21 is a schematic view of another mask according to the second embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Example one

Fig. 4 is a schematic diagram illustrating a pixel arrangement of a display substrate according to a first embodiment of the present invention, and referring to fig. 4, the display substrate includes a plurality of pixel units 10 arranged in an array, and light-emitting layers of adjacent same-color sub-pixels in adjacent pixel units 10 are in an integral structure.

In the pixel unit 10, the area occupied by the first sub-pixel 11 of the first color is the largest, four pixel units arranged in two rows and two columns are a pixel unit group 100, the pixel unit groups 100 are arranged in an array, and in the pixel unit group 100, the first sub-pixel 11 in each pixel unit 10 is arranged near the geometric center C of the pixel unit group 100 where the first sub-pixel 11 is located.

In the embodiment of the present invention, the light emitting layers of the adjacent same-color sub-pixels in the adjacent pixel units 10 are of an integrated structure, and therefore, during the preparation, the light emitting layers of the four first sub-pixels can be formed through one mask pattern opening, and for the first sub-pixel of the first color with the largest area ratio, the light emitting layers of the four first sub-pixels can be formed through one mask pattern opening, so that the size of the mask pattern opening on the mask can be increased, the gap between the adjacent sub-pixels can be reduced, and the gap between the adjacent sub-pixels is not limited by the accuracy of the mask any more, thereby improving the resolution and the aperture ratio of the display substrate. In addition, in the embodiment of the invention, the light emitting layers of at least two sub-pixels are of an integrated structure, namely, at least two sub-pixels can be prepared by one mask pattern opening of the mask, so that the precision requirement of the mask is reduced, the evaporation process difficulty of the sub-pixels is further reduced, the yield of the display device is correspondingly improved, and the service life and other parameters of the display device are correspondingly improved.

Optionally, the shape of the first sub-pixel 11 includes at least one right-angled vertex, which is disposed near the geometric center C of the pixel unit group 100 where the first sub-pixel 11 is located.

In the pixel unit group 100, the right-angled vertex of the first sub-pixel 11 occupying the largest ratio among the four pixel units 10 is disposed near the geometric center C, so that the four first sub-pixels 11 in each pixel unit group 100 can be formed through one mask pattern opening, and thus, the aperture ratio of the first sub-pixels 11 can be increased.

It should be noted that, in the embodiment of the present invention, the light emitting layer at least includes a light emitting material layer, and of course, the light emitting layer may further include some other functional layers, for example, in some alternative embodiments, the light emitting layer may further include an electron transport layer, an electron injection layer, a hole transport layer, a hole injection layer, and the like, which is not specifically limited in this embodiment of the present invention.

The sub-pixel arrangement will be described in detail below by taking an example in which the pixel unit 10 includes a blue sub-pixel, a red sub-pixel, and a green sub-pixel, where the blue sub-pixel is the first sub-pixel with the largest area ratio.

In an alternative embodiment, the first sub-pixel 11 is in the shape of a right triangle, and the right vertex of the right triangle is located near the geometric center C of the pixel unit group 100 where the first sub-pixel 11 is located.

Specifically, optionally, referring to fig. 4 and 5, the right triangle is an isosceles right triangle.

In a specific application, the length of the waist of the isosceles right triangle may be less than or equal to the preset pixel unit side length L.

Referring to fig. 4, when the length of the isosceles right triangle is equal to L, the adjacent blue sub-pixels are evaporated in a 4in 1 manner (i.e., the adjacent 4 blue sub-pixels are formed through one mask pattern opening), the adjacent red sub-pixels are evaporated in a 2in 1 manner (i.e., the adjacent 2 red sub-pixels are formed through one mask pattern opening), and the adjacent green sub-pixels are evaporated in a 2in 1 manner (i.e., the adjacent 2 green sub-pixels are formed through one mask pattern opening).

Referring to fig. 5, when the length of the isosceles right triangle is smaller than L, the adjacent blue sub-pixels are evaporated in a 4in 1 manner, the adjacent red sub-pixels are evaporated in a 4in 1 manner, and the adjacent green sub-pixels are evaporated in a 4in 1 manner.

Still alternatively, referring to fig. 6, 7 and 8, the right triangle may also be a non-isosceles right triangle.

In a specific application, the length of the long right-angle side of the non-isosceles right triangle may be less than or equal to the length L of the predetermined pixel unit side, and correspondingly, the length of the short right-angle side of the non-isosceles right triangle is less than the length of the long right-angle side, that is, less than L.

Referring to fig. 6, when the long right-angle side of the non-isosceles right triangle is equal to L, the adjacent blue sub-pixels are evaporated in a 4in 1 manner, the adjacent red sub-pixels are evaporated in a 2in 1 manner, and the adjacent green sub-pixels are evaporated in a 4in 1 manner. Alternatively, referring to fig. 7, the adjacent blue sub-pixel is deposited by the 4in 1 method, the adjacent red sub-pixel is deposited by the 4in 1 method, and the adjacent green sub-pixel is deposited by the 2in 1 method.

Referring to fig. 8, when the long right-angle side of the non-isosceles right triangle is less than L, the adjacent blue sub-pixels are evaporated in a 4in 1 manner, the adjacent red sub-pixels are evaporated in a 4in 1 manner, and the adjacent green sub-pixels are evaporated in a 4in 1 manner.

In another alternative embodiment, the first sub-pixel 11 has the shape of 1/2 arch, and the right-angled vertex of the 1/2 arch is located near the geometric center C of the pixel cell group 100 where the first sub-pixel 11 is located.

Specifically alternatively, referring to fig. 9 and 10, the 1/2 arc is 1/2 half-circle arc, i.e., 1/4 circle.

In a specific application, the two right-angle sides of the 1/2 semicircular arc are equal in length, and the length of the right-angle side of the 1/2 semicircular arc can be smaller than or equal to the preset length L of the pixel unit side.

Referring to fig. 9, when the length of the right-angle side of the 1/2 semicircular arc is equal to L, the adjacent blue sub-pixels are evaporated in a 4in 1 manner, the adjacent red sub-pixels are evaporated in a 2in 1 manner, and the adjacent green sub-pixels are evaporated in a 2in 1 manner.

Referring to fig. 10, when the length of the right-angle side of the 1/2 semicircular arch is less than L, the adjacent blue sub-pixels are evaporated in a 4in 1 mode, the adjacent red sub-pixels are evaporated in a 4in 1 mode, and the adjacent green sub-pixels are evaporated in a 4in 1 mode.

Still alternatively, referring to fig. 11, 12 and 13, the 1/2 bow may also be a 1/2 minor arc bow.

In a specific application, the long right-angle side length of the inferior arc 1/2 may be less than or equal to the preset pixel unit side length L, and correspondingly, the short right-angle side length of the inferior arc 1/2 is less than the long right-angle side length, i.e. less than L.

Referring to fig. 11, when the length of the long rectangular side of the minor arc segment 1/2 is equal to L, the adjacent blue sub-pixel is deposited by the 4in 1 method, the adjacent red sub-pixel is deposited by the 2in 1 method, and the adjacent green sub-pixel is deposited by the 4in 1 method. Alternatively, referring to fig. 12, the adjacent blue sub-pixel is evaporated by the 4in 1 method, the adjacent red sub-pixel is evaporated by the 4in 1 method, and the adjacent green sub-pixel is evaporated by the 2in 1 method.

Referring to fig. 13, when the length of the long rectangular side of the minor arc segment 1/2 is less than L, the adjacent blue sub-pixel is deposited by the 4in 1 method, the adjacent red sub-pixel is deposited by the 4in 1 method, and the adjacent green sub-pixel is deposited by the 4in 1 method.

Still alternatively, referring to fig. 14, 15 and 16, the 1/2 arc may also be a 1/2 major arc.

In a specific application, the length of the long right-angle side of the 1/2 u-arc may be less than or equal to the preset length L of the pixel unit side, and correspondingly, the length of the short right-angle side of the 1/2 u-arc may be less than the length of the long right-angle side, that is, less than L.

Referring to fig. 14, when the length of the long right-angle side of the 1/2 major arc segment is equal to L, the adjacent blue sub-pixel is evaporated in a 4in 1 manner, the adjacent red sub-pixel is evaporated in a 2in 1 manner, and the adjacent green sub-pixel is evaporated in a 4in 1 manner. Alternatively, referring to fig. 15, the adjacent blue sub-pixel is deposited by the 4in 1 method, the adjacent red sub-pixel is deposited by the 4in 1 method, and the adjacent green sub-pixel is deposited by the 2in 1 method.

Referring to fig. 16, when the length of the long right-angle side of the 1/2 major arc segment is less than L, the adjacent blue sub-pixel is deposited by the 4in 1 method, the adjacent red sub-pixel is deposited by the 4in 1 method, and the adjacent green sub-pixel is deposited by the 4in 1 method.

In yet another alternative embodiment, the first sub-pixel 11 is in the shape of a rectangle, and any right-angle vertex of the rectangle is disposed near the geometric center C of the pixel unit group 100 where the first sub-pixel 11 is located.

Specifically, optionally, referring to fig. 17, the rectangle is a square.

The side length of the square is smaller than the preset pixel unit side length L.

Still alternatively, referring to fig. 18, the rectangle is rectangular.

In a specific application, the length of the long side of the rectangle may be smaller than the preset length L of the pixel unit, and correspondingly, the length of the short side of the rectangle is smaller than the length of the long side, that is, smaller than L.

Referring to fig. 18, when the length of the long side of the rectangle is less than L, the adjacent blue sub-pixel is deposited by the 4in 1 method, the adjacent red sub-pixel is deposited by the 4in 1 method, and the adjacent green sub-pixel is deposited by the 4in 1 method.

In the embodiment of the present invention, further optionally, referring to fig. 4 to 18, the pixel unit 10 further includes a second sub-pixel 12 of a second color and a third sub-pixel 13 of a third color.

In the pixel unit 10, the first sub-pixel 11, the second sub-pixel 12 and the third sub-pixel 13 with different colors respectively have different area ratios, and in a specific application, the remaining area in the pixel unit 10 can be allocated to the second sub-pixel 12 and the third sub-pixel 13 on the basis of ensuring the graphic design and the arrangement position of the first sub-pixel 11 with the largest area ratio.

In practical applications, the area ratio of the first sub-pixel 11, the second sub-pixel 12, and the third sub-pixel 13 with different colors may vary according to the light emitting material.

Optionally, the first sub-pixel 11 of the first color is a blue sub-pixel, the second sub-pixel 12 of the second color is a red sub-pixel, and the third sub-pixel 13 of the third color is a green sub-pixel.

In practical applications, the area ratio of the red sub-pixel to the green sub-pixel in the pixel unit 10 is optionally 1:1-1:1.4, and the area ratio of the red sub-pixel to the blue sub-pixel in the pixel unit 10 is optionally 1:1.6-1: 2. The area ratio range is only an exemplary range, and is not intended to limit the present invention, and may be adjusted as needed in actual use.

It should be noted that the above drawings are only for assisting the description of the present invention, and it should be understood that in practical applications, the sub-pixels have a certain pitch.

Example two

Referring to fig. 19, a mask according to a second embodiment of the present invention is shown, which is used for preparing the display substrate, and includes a plurality of discrete mask pattern openings a, where the mask pattern openings a are used for forming light emitting layers of adjacent same-color sub-pixels in adjacent pixel units.

Optionally, the same-color sub-pixel is a blue sub-pixel, that is, the mask is specifically a first mask for preparing the blue sub-pixel. FIG. 19 shows a schematic view of a first reticle. In practical applications, the blue sub-pixel may be evaporated by the first mask under vacuum conditions to obtain the first sub-pixel 11 shown in fig. 4.

Optionally, the same-color sub-pixel is a red sub-pixel, that is, the mask is specifically a second mask for preparing the red sub-pixel. FIG. 20 shows a schematic view of a second reticle. In practical applications, the red sub-pixel may be evaporated by the second mask under vacuum conditions to obtain the second sub-pixel 12 shown in fig. 4.

Optionally, the same-color sub-pixel is a green sub-pixel, that is, the mask is specifically a third mask for preparing the green sub-pixel. FIG. 21 shows a schematic diagram of a third reticle. In practical applications, the green sub-pixel may be evaporated by a third mask under vacuum conditions to obtain a third sub-pixel 13 shown in fig. 4.

In the embodiment of the present invention, the evaporation order of the blue sub-pixel, the red sub-pixel, and the green sub-pixel is not particularly limited.

It should be noted that, according to the shape and arrangement of the sub-pixels designed in the first embodiment, masks with different opening shapes can be respectively prepared, and the evaporation process of the sub-pixels with the same color is performed through the masks in a vacuum environment, so that the display substrate described in the first embodiment can be obtained.

EXAMPLE III

The embodiment of the invention also discloses a display device which comprises the display substrate.

Alternatively, the display substrate may be an OLED (Organic Light-Emitting Diode) display substrate, and accordingly, the display device may be an OLED display device.

In the embodiment of the invention, the actual resolution of the display device is the physical resolution thereof.

While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The display substrate, the mask and the display device provided by the invention are described in detail, and the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. The display substrate is characterized by comprising a plurality of pixel units which are arranged in an array mode, wherein light emitting layers of adjacent same-color sub-pixels in the adjacent pixel units are of an integral structure;

2. The display substrate of claim 1, wherein the shape of the first sub-pixel comprises at least one right angle vertex disposed near a geometric center of the group of pixel cells in which the first sub-pixel is located.

3. The display substrate according to claim 2, wherein the first sub-pixel has a shape of a right triangle, and a right vertex of the right triangle is disposed near a geometric center of the pixel unit group in which the first sub-pixel is located.

4. The display substrate of claim 3, wherein the right triangle is an isosceles right triangle.

5. The display substrate of claim 2, wherein the first sub-pixel has a shape of 1/2 arch, and wherein a right angle vertex of the 1/2 arch is disposed near a geometric center of the group of pixel cells in which the first sub-pixel is located.

6. The display substrate of claim 5, wherein the 1/2 arc is a 1/2 semi-circular arc.

7. The display substrate according to claim 2, wherein the first sub-pixel has a rectangular shape, and any right-angle vertex of the rectangular shape is disposed near a geometric center of the pixel unit group in which the first sub-pixel is located.

8. The display substrate of claim 7, wherein the rectangle is a square.

9. The display substrate of any one of claims 1-8, wherein the pixel cell further comprises a second subpixel of a second color and a third subpixel of a third color.

10. The display substrate of claim 9, wherein the first sub-pixel of the first color is a blue sub-pixel, the second sub-pixel of the second color is a red sub-pixel, and the third sub-pixel of the third color is a green sub-pixel.

11. A mask for preparing the display substrate of any one of claims 1-10, the mask comprising a plurality of discrete mask pattern openings for forming light emitting layers of adjacent same-color sub-pixels in adjacent pixel units.

12. The reticle of claim 11, wherein the homochromatic sub-pixels are blue sub-pixels.

13. The reticle of claim 11, wherein the homochromatic sub-pixels are red sub-pixels.

14. The reticle of claim 11, wherein the homochromatic sub-pixels are green sub-pixels.

15. A display device comprising the display substrate according to any one of claims 1 to 10.