CN108010934A - Dot structure and forming method thereof, OLED display panel and evaporation mask plate - Google Patents
Dot structure and forming method thereof, OLED display panel and evaporation mask plate Download PDFInfo
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
- H10K59/352—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels the areas of the RGB subpixels being different
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/04—Coating on selected surface areas, e.g. using masks
- C23C14/042—Coating on selected surface areas, e.g. using masks using masks
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- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
- H10K59/353—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels characterised by the geometrical arrangement of the RGB subpixels
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/10—Deposition of organic active material
- H10K71/16—Deposition of organic active material using physical vapour deposition [PVD], e.g. vacuum deposition or sputtering
- H10K71/166—Deposition of organic active material using physical vapour deposition [PVD], e.g. vacuum deposition or sputtering using selective deposition, e.g. using a mask
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Abstract
The present invention provides a kind of dot structure and forming method thereof, OLED display panel and evaporation mask plate.The dot structure includes multiple pixel groups, each pixel groups are made of multiple pixel units adjacent in same row (OK), each pixel unit includes the first sub-pixel, the second sub-pixel and the 3rd sub-pixel, first sub-pixel and the second pixel arrangement are in a (row), 3rd pixel arrangement luminous zone of the 3rd sub-pixel of adjacent two row (OK) in another a (row), same row (column) is arranging arrangement of (OK) staggering on direction.In this way, the aperture opening ratio of the 3rd sub-pixel of the size of connecting bridge or raising on evaporation mask plate can be increased, connecting bridge size can also be increased at the same time and improve the aperture opening ratio of the 3rd sub-pixel, and lift display effect.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel structure, a forming method thereof, an OLED display panel comprising the pixel structure and an evaporation mask.
Background
An OLED (Organic Light-Emitting Diode) is an active Light-Emitting device. Compared with the traditional LCD (Liquid Crystal Display) Display mode, the OLED Display technology does not need a backlight lamp and has the self-luminous characteristic. The OLED adopts a thin organic material film layer and a glass substrate, and when a current flows, the organic material can emit light. Therefore, the OLED display panel can save electric energy remarkably, can be made lighter and thinner, can endure a wider range of temperature variation than the LCD display panel, and has a larger visual angle. The OLED display panel is expected to become a next-generation flat panel display technology following the LCD, and is one of the technologies that receives the most attention among the flat panel display technologies at present.
There are many colorization methods for OLED screens, and the OLED colorization technology that is mature and has been successfully mass-produced is mainly the OLED evaporation technology, which uses the conventional RGB Stripe arrangement for evaporation. The best picture effect is the side-by-side (juxtaposition) mode. The side-by-side method is characterized in that three sub-pixels (R, G, B) of red, green and blue are arranged in a Pixel (Pixel) range, each sub-Pixel is quadrilateral and is provided with an independent organic light-emitting component, the organic light-emitting components are formed at corresponding Pixel positions on an array substrate through a high-precision Metal Mask (FMM) by utilizing an evaporation film forming technology, and the high-precision Metal Mask is usually referred to as a Metal Mask or an evaporation Mask for short. The technical focus of fabricating high PPI (Pixel Per Inch, number of pixels) OLED display panels is on the FMM with fine and mechanical stability and the arrangement of the pixels (sub-pixels).
Fig. 1A is a schematic diagram of a pixel arrangement of an OLED display panel in the prior art. As shown in fig. 1A, the OLED display panel adopts a Pixel juxtaposition manner, each Pixel unit Pixel includes an R sub-Pixel region 101, a G sub-Pixel region 103 and a B sub-Pixel region 105, wherein the R sub-Pixel region 101 includes an R emitting region 102 and an R non-emitting region (not numbered), the G sub-Pixel region 103 includes a G emitting region 104 and a G non-emitting region (not numbered), and the B sub-Pixel region 105 includes a B emitting region 106 and a B non-emitting region (not numbered). The R, G, B subpixels shown in FIG. 1A have equal areas of area and light emitting area, respectively, and R, G, B subpixels are arranged in a straight line. Specifically, in the light emitting region of each sub-pixel region, a cathode electrode, an anode electrode, and an electroluminescent layer (also referred to as an organic emission layer) between the cathode electrode and the anode electrode for generating light of a predetermined color to realize display are included. In the preparation of the display panel in the prior art, three times of evaporation processes are generally required to form electroluminescent layers of corresponding colors (red, green or blue) in the light-emitting regions of the pixel regions of the corresponding colors, respectively.
The OLED display panel shown in fig. 1A is usually vapor-deposited by using the FMM shown in fig. 1B, which includes a shielding region 107 and a plurality of vapor deposition openings 108, and the shielding region between two adjacent vapor deposition openings 108 in the same column is called a bridge (bridge). In order to avoid the shielding effect on the sub-pixels during evaporation, a sufficient distance must be kept between the sub-pixels and the bridge, which results in the reduction of the length of the sub-pixels above and below, and affects the aperture ratio of each sub-pixel. With the increasing demand of users for the resolution of the OLED display panel, the RGB pixel juxtaposition method has not been able to meet the design requirement of high PPI of the product.
Fig. 2A is a schematic diagram of a pixel arrangement of another OLED display panel in the prior art. As shown in fig. 2A, each Pixel unit Pixel includes an R sub-Pixel region 201, a G sub-Pixel region 203 and a B sub-Pixel region 205, wherein the R sub-Pixel region 201 includes an R emitting region 202 and an R non-emitting region, the G sub-Pixel region 203 includes a G emitting region 204 and a G non-emitting region, and the B sub-Pixel region 205 includes a B emitting region 206 and a B non-emitting region. The R, G sub-pixels shown in fig. 2A have equal areas and light-emitting areas, respectively, and the three sub-pixels are arranged in a chevron or inverted chevron, while the B light-emitting areas 206 on the same column are arranged in a straight line.
Fig. 2B is a schematic diagram of an FMM corresponding to the R sub-pixel or the G sub-pixel of fig. 2A, wherein the FMM includes a shielding region 207 and an evaporation opening 208. Fig. 2C is a schematic diagram of an FMM corresponding to the B sub-pixel of fig. 2A, which includes a shielding region 209 and an evaporation opening 210. In this pixel arrangement, the pixels are periodically translated horizontally and vertically to form a row and column pixel array. The opening space of the evaporation mask plate corresponding to the red and green sub-pixels is relatively large, and high PPI display can be realized to a certain extent. However, as a result of the above-mentioned periodic arrangement of the pixels, the B sub-pixels in the pixel array form a linear arrangement, and due to the limitation of the FMM fabrication capability, there is a certain requirement for the Bridge (the Bridge must reach a certain size), which affects the further improvement of the aperture ratio of the B sub-pixels, and the display effect is not ideal.
Disclosure of Invention
The invention aims to provide a pixel structure, a forming method thereof, an OLED display panel and an evaporation mask plate, and aims to solve the problem that the aperture opening ratio is difficult to improve in the prior art.
Another objective of the present invention is to provide a pixel structure, a method for forming the same, an OLED display panel, and an evaporation mask, so as to solve the problem of unsatisfactory display effect.
In order to solve the above technical problem, the present invention provides a pixel structure, each pixel group is composed of a plurality of adjacent pixel units on the same column, each pixel unit includes a first sub-pixel, a second sub-pixel and a third sub-pixel, the first sub-pixel and the second sub-pixel are arranged in one column, the third sub-pixel is arranged in another column, and light emitting areas of the third sub-pixels in two adjacent columns on the same row are arranged in a staggered manner in a column direction; or each pixel group is composed of a plurality of adjacent pixel units on the same row, each pixel unit comprises a first sub-pixel, a second sub-pixel and a third sub-pixel, the first sub-pixel and the second sub-pixel are arranged in one row, the third sub-pixel is arranged in the other row, and light emitting areas of the third sub-pixels of the two adjacent rows on the same column are arranged in a staggered mode in the row direction.
Optionally, in the pixel structure, the third sub-pixel in the same pixel group is formed by evaporation through the same evaporation opening on the evaporation mask.
Optionally, in the pixel structure, when each pixel group is composed of a plurality of adjacent pixel units on the same column, the evaporation openings of the third sub-pixels in two adjacent columns on the evaporation mask are arranged in a staggered manner in the column direction; when each pixel group consists of a plurality of adjacent pixel units on the same line, the evaporation openings of the third sub-pixels of two adjacent lines on the evaporation mask are arranged in a staggered manner in the line direction.
Optionally, in the pixel structure, each pixel group is composed of two pixel units; that is, when each pixel group is composed of a plurality of adjacent pixel units on the same column, two adjacent third sub-pixels in the same column are formed by evaporation through the same evaporation opening on the evaporation mask, and when each pixel group is composed of a plurality of adjacent pixel units in the same row, two adjacent third sub-pixels in the same row are formed by evaporation through the same evaporation opening on the evaporation mask.
Optionally, in the pixel structure, the light emitting areas of the third sub-pixels of the two pixel units in the same pixel group are shifted to the boundary of the two third sub-pixels, and the light emitting areas of the third sub-pixels of the two pixel units in the same pixel group are distributed along the boundary of the two third sub-pixels in a mirror symmetry manner.
Optionally, in the pixel structure, when each pixel group is composed of a plurality of adjacent pixel units on the same column, the arrangement modes of the evaporation openings on the evaporation masks corresponding to the third sub-pixels on all odd-numbered columns are the same, and the arrangement modes of the evaporation openings on the evaporation masks corresponding to the third sub-pixels on all even-numbered columns are the same; when each pixel group consists of a plurality of adjacent pixel units on the same line, the arrangement modes of the evaporation openings on the evaporation mask plates corresponding to the third sub-pixels on all odd lines are the same, and the arrangement modes of the evaporation openings on the evaporation mask plates corresponding to the third sub-pixels on all even lines are the same.
Optionally, in the pixel structure, each pixel group is composed of three pixel units, that is, when each pixel group is composed of a plurality of adjacent pixel units on the same column, three adjacent third sub-pixels in the same column are formed by evaporation through the same evaporation opening on the evaporation mask, and when each pixel group is composed of a plurality of adjacent pixel units in the same row, three adjacent third sub-pixels in the same row are formed by evaporation through the same evaporation opening on the evaporation mask.
Optionally, in the pixel structure, in three pixel units in the same pixel group, the light emitting area of the third sub-pixel of the middle pixel unit is located at the center of the third sub-pixel, and the light emitting areas of the third sub-pixels of the other two pixel units are shifted to the middle third sub-pixel. The light emitting areas of the third sub-pixels of the other two pixel units in the same pixel group are shifted to the middle third sub-pixel by the same amount
Optionally, in the pixel structure, when each pixel group is composed of a plurality of adjacent pixel units in the same column, the arrangement modes of the evaporation openings on the evaporation mask corresponding to the third sub-pixels in the integral multiple columns of all 3 are the same, the arrangement modes of the evaporation openings on the evaporation mask corresponding to the third sub-pixels in all 3 in the integral multiple minus 1 column are the same, and the arrangement modes of the evaporation openings on the evaporation mask corresponding to the third sub-pixels in all 3 in the integral multiple minus 2 columns are the same; when each pixel group consists of a plurality of adjacent pixel units on the same line, the arrangement modes of the evaporation openings on the evaporation mask plates corresponding to the third sub-pixels on the integral multiple of all 3 lines are the same, the arrangement modes of the evaporation openings on the evaporation mask plates corresponding to the third sub-pixels on all 3 lines by integer times 1 line are the same, and the arrangement modes of the evaporation openings on the evaporation mask plates corresponding to the third sub-pixels on all 3 lines by integer times 2 line are the same.
Optionally, in the pixel structure, the first sub-pixel is a red sub-pixel, the second sub-pixel is a green sub-pixel, the third sub-pixel is a blue sub-pixel, and an area of the third sub-pixel is larger than areas of the first sub-pixel and the second sub-pixel.
According to another aspect of the present invention, there is provided an OLED display panel including the pixel structure as described in any one of the above.
According to another aspect of the present invention, there is provided an evaporation mask for evaporating the pixel structure as described above.
According to another aspect of the present invention, a method for forming a pixel structure is provided, in which a third sub-pixel in a same pixel group is formed by evaporation through a same evaporation opening of an evaporation mask.
The invention provides a pixel structure of an OLED display panel, wherein each pixel group consists of a plurality of adjacent pixel units in the same column (row), each pixel unit comprises a first sub-pixel, a second sub-pixel and a third sub-pixel, the first sub-pixel and the second sub-pixel are arranged in one column (row), the third sub-pixel is arranged in the other column (row), and light emitting areas of the third sub-pixels in the two adjacent columns (rows) in the same row (column) are arranged in a staggered mode in the column (row) direction, so that the display effect is improved. In addition, the third sub-pixel in the same pixel group is formed by evaporation through the same evaporation opening on the evaporation mask, so that the size of a connecting bridge (bridge) on the evaporation mask can be increased under the condition of the same opening rate, the difficulty of the mask manufacturing process and the evaporation process is reduced, the opening rate of the third sub-pixel can be increased under the condition of the same bridge size, and the bridge size and the opening rate of the third sub-pixel can be increased at the same time.
Drawings
Fig. 1A is a schematic diagram of a pixel arrangement of an OLED display panel in the prior art.
FIG. 1B is a schematic diagram of an FMM corresponding to FIG. 1A.
Fig. 2A is a schematic diagram of a pixel arrangement of another OLED display panel in the prior art.
FIG. 2B is a diagram of an FMM corresponding to the R or G sub-pixel of FIG. 2A.
FIG. 2C is a diagram of an FMM corresponding to the B sub-pixel of FIG. 2A.
Fig. 3A is a schematic view of a first pixel arrangement of an OLED display panel according to an embodiment of the invention.
FIG. 3B is a diagram of an FMM corresponding to the first sub-pixel or the second sub-pixel of FIG. 3A.
FIG. 3C is a diagram of an FMM corresponding to the third sub-pixel of FIG. 3A.
Fig. 3D is a schematic diagram of a second pixel arrangement of the OLED display panel according to the first embodiment of the invention.
Fig. 4A is a schematic view of a pixel arrangement of an OLED display panel according to a second embodiment of the invention.
FIG. 4B is a diagram of the FMM corresponding to the first sub-pixel of FIG. 4A.
FIG. 4C is a diagram of an FMM corresponding to the second sub-pixel of FIG. 4A.
Fig. 5A is a schematic view of pixel arrangement of an OLED display panel according to a third embodiment of the invention.
FIG. 5B is a diagram of the FMM corresponding to the first sub-pixel of FIG. 5A.
FIG. 5C is a diagram of an FMM corresponding to the second sub-pixel of FIG. 5A.
Fig. 6A is a schematic view of pixel arrangement of an OLED display panel according to a fourth embodiment of the invention.
FIG. 6B is a diagram of an FMM corresponding to the third sub-pixel of FIG. 6A.
Detailed Description
As described in the background section, the applicant has found that the conventional RGB pixel arrangement can not meet the requirements of aperture ratio and display effect of the product. On the one hand, the light emitting areas of the adjacent sub-pixels in the same row are arranged in a straight line, so that the display effect is not ideal; on the other hand, blue (B) sub-pixels in the pixel array are linearly arranged (linearly arranged in a row or a column), because of the limitation of FMM manufacturing capability, the connecting bridge (bridge) must reach a certain size, otherwise, the bridge is easily deformed by magnetic lines of force and external force, and in order to avoid shielding effect on the sub-pixels during evaporation, a sufficient distance must be kept between the sub-pixels and the bridge, which results in the reduction of the length of the sub-pixels above and below, and affects the further improvement of the aperture ratio of the B sub-pixels.
Based on this, the invention provides a pixel structure of an OLED display panel, which includes a plurality of pixel groups, each pixel group is composed of a plurality of pixel units adjacent to each other in the same column (row), each pixel unit includes a first sub-pixel, a second sub-pixel and a third sub-pixel, wherein the first sub-pixel and the second sub-pixel are arranged in one column (row), the third sub-pixel is arranged in another column (row), the third sub-pixel in the same pixel group is formed by evaporation through the same evaporation opening on an evaporation mask, and light emitting areas of the third sub-pixels in two adjacent columns (rows) in the same row (column) are arranged in a staggered manner in the column (row) direction. The light emitting areas of the third sub-pixels of two adjacent columns on the same row are staggered in the column direction, so that the display effect is improved; in addition, the third sub-pixel in the same pixel group is formed by adopting one evaporation opening, so that the size of a connecting bridge (bridge) on an evaporation mask can be increased under the condition of the same opening rate, the difficulty of the mask manufacturing process and the evaporation process is reduced, or the opening rate of the third sub-pixel is increased under the condition of the same bridge size, or the bridge size and the opening rate of the third sub-pixel are appropriately increased at the same time.
The pixel structure, the forming method thereof, the OLED display panel and the evaporation mask according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Example one
Fig. 3A is a schematic diagram of a pixel arrangement of an OLED display panel according to an embodiment of the invention, fig. 3B is a schematic diagram of an FMM corresponding to the first sub-pixel or the second sub-pixel of fig. 3A, and fig. 3C is a schematic diagram of an FMM corresponding to the third sub-pixel of fig. 3A.
Here, the X direction is referred to as a row direction (lateral direction), and the Y direction is referred to as a column direction (longitudinal direction). For simplicity, only a portion of the OLED display panel is shown in the drawings, and the number of pixels in an actual product is not limited thereto, for example, only 4 rows by 4 columns of pixel units are shown in fig. 3A, but actually, the number of pixel units may be changed accordingly according to actual display requirements. The first row, the second row, the first column, the second column, etc. are illustrated in the drawings as reference standards for explaining the present invention, and do not refer to the rows and columns in the actual product.
In fig. 3A, the pixel unit in the first row and the first column is denoted as a pixel unit (1,1), the pixel unit in the first row and the second column is denoted as a pixel unit (1,2), the pixel unit in the second row and the first column is denoted as a pixel unit (2,1), the pixel unit in the second row and the second column is denoted as a pixel unit (2,2), and so on. Similarly, the first sub-pixel in the pixel unit of the first row and the first column is denoted as a first sub-pixel (1,1), the first sub-pixel in the pixel unit of the first row and the second column is denoted as a first sub-pixel (1,2), the second sub-pixel in the pixel unit of the first row and the first column is denoted as a second sub-pixel (1,1), the second sub-pixel in the pixel unit of the first row and the second column is denoted as a second sub-pixel (1,2), and so on.
As shown in fig. 3A, the pixel structure of the OLED display panel includes a plurality of pixel groups arranged in an array, and a pixel array of rows and columns is formed by periodically moving one pixel group. Each Pixel group is composed of a plurality of adjacent Pixel units Pixel on the same column, and the Pixel groups of two adjacent columns are arranged in a staggered mode. For example, one pixel group of the second column shown by a dotted line frame in fig. 3A is composed of a pixel unit (2,2) of the second row and the second column and a pixel unit (3,2) of the third row and the second column, and one pixel group of the third column shown by a dotted line frame in fig. 3A is composed of a pixel unit (1,3) of the third row and the third column and a pixel unit (2, 3) of the second row and the third column, that is, the pixel groups of the second column and the third column are staggered from each other (here, staggered by a distance of one row) instead of being composed of pixel units of the same row, and similarly, the pixel groups of the second column and the first column are also staggered from each other.
Each Pixel unit Pixel comprises a first sub-Pixel 301, a second sub-Pixel 303 and a third sub-Pixel 305, the first sub-Pixel 301 and the second sub-Pixel 303 are arranged in one column, the third sub-Pixel 305 is arranged in another column, specifically, the first sub-Pixel 301, the second sub-Pixel 303 and the third sub-Pixel 305 are arranged in a shape of a Chinese character pin, an inverted Chinese character pin, a Chinese character pin rotated 90 degrees to the left, or a Chinese character pin rotated 90 degrees to the right, or can be arranged in a shape of a Chinese character pin, an inverted Chinese character pin, a Chinese character pin rotated 90 degrees to the left, or a Chinese character pin rotated 90 degrees to the right.
The "column direction" herein may refer to both a longitudinal direction and a transverse direction, and when the column direction refers to the longitudinal direction (Y direction), the row direction refers to the transverse direction (X direction), but if the OLED display panel is rotated by 90 degrees, it is understood that the column direction and the row direction are interchanged. Specifically, as shown in fig. 3D, after the pixel structure is rotated by 90 degrees, the original row direction is converted into the column direction, and the original column direction is converted into the row direction, wherein one pixel group in the first row is composed of a pixel unit (1,1) in the first row and the first column and a pixel unit (1,2) in the first row and the second column, one pixel group in the second row is composed of a pixel unit (2,2) in the second row and the second column and a pixel unit (2, 3) in the second row and the third column, the pixel groups in the first row and the second row are staggered with each other (here, staggered by a distance of one column) instead of being composed of pixel units in the same column, and similarly, the pixel groups in the second row and the third row are also staggered with each other.
Each sub-pixel comprises a luminous area (display area) and a non-luminous area (non-display area), the luminous area of each sub-pixel comprises a cathode, an anode and an electroluminescent layer (organic emission layer), and the electroluminescent layer is located between the cathode and the anode and is used for generating light of a preset color to achieve display. It is usually necessary to use three times of evaporation processes to form electroluminescent layers of corresponding colors (such as red, green or blue) in the light-emitting regions of the pixel regions of corresponding colors, respectively. In this embodiment, the first sub-pixel 301 is a red (R) sub-pixel, the second sub-pixel 303 is a green (G) sub-pixel, and the third sub-pixel 305 is a blue (B) sub-pixel; accordingly, the first sub-pixel 301 includes an R light emitting region 302 and an R non-light emitting region (not numbered in the drawing), and includes an organic emission layer for emitting red light; the second sub-pixel 303 includes a G light emitting region 304 and a G non-light emitting region (not numbered in the drawing), and includes an organic emission layer for emitting green light; the third sub-pixel 305 includes a B light emitting region 306 and a B non-light emitting region (not numbered) and includes an organic emission layer for emitting blue light.
Since the light emitting efficiency of the B sub-pixel is generally the lowest and accordingly the required light emitting area is larger, the area of the third sub-pixel 305 is preferably larger than the area of the first sub-pixel 301 and the second sub-pixel 303. More preferably, the first subpixel 301 and the second subpixel 303 have the same shape and area. In this embodiment, as shown in fig. 3A, the first sub-pixel 301 and the second sub-pixel 303 are both square, and the third sub-pixel 305 is rectangular, wherein the first sub-pixel 301 and the second sub-pixel 303 are both h1 in length and width, and the third sub-pixel 305 is h1 in width and 2 h1 in height, i.e. the area of the B sub-pixel is 2 times that of the G sub-pixel or the R sub-pixel. However, it should be understood that the shapes of the first sub-pixel 301, the second sub-pixel 303, and the third sub-pixel 303 are not limited to a rectangle, and may be quadrangles other than a rectangle, or one or any combination of polygons such as a triangle, a pentagon, a hexagon, and an octagon. Meanwhile, the areas of the first sub-pixel 301 and the second sub-pixel 303 may not be equal, and the area of the third sub-pixel 305 is not limited to 2 times the area of the first sub-pixel 301 or the second sub-pixel 303, and the shape and/or the area of each sub-pixel may be adjusted according to the color matching requirement.
As shown in fig. 3B, the FMM corresponding to the first sub-pixel 301 or the second sub-pixel 303 includes a shielding region 307 and an evaporation opening 308. Since the first sub-pixel 301 and the second sub-pixel 303 have the same shape and area and the same arrangement, the same FMM may be used to perform evaporation twice, or two FMMs may be used to perform evaporation respectively. Referring to fig. 3A, in the present embodiment, the first sub-pixels 301 in the same row of pixel units are arranged in a straight line, and the second sub-pixels 303 in the same row of pixel units are arranged in a straight line. For example, the evaporation openings in the first row and the first column on the mask are used to form the first sub-pixel (1,1) in the pixel unit in the first row and the first column, the evaporation openings in the first row and the second column are used to form the first sub-pixel (1,2) in the pixel unit in the first row and the second column, the evaporation openings in the second row and the first column are used to form the first sub-pixel (2,1) in the pixel unit in the second row and the first column, and so on. As shown in fig. 3C, the FMM corresponding to the third sub-pixel 305 includes a shielding region 309 and an evaporation opening 310. Since the area of the third subpixel 305 is larger than the areas of the first subpixel 301 and the second subpixel 303, the area of the vapor deposition opening 310 is also larger than the area of the vapor deposition opening 308. The evaporation openings 310 of two adjacent columns of the evaporation mask are arranged in a staggered manner. Note that fig. 3B and 3C only show evaporation openings corresponding to 8 rows by 8 columns of pixel cells, but actually, the number of evaporation openings may vary depending on the number of pixel cells.
In the present embodiment, as shown in fig. 3A and fig. 3C, the same pixel group is composed of two adjacent pixel units in the same column, two adjacent third sub-pixels 305 in the same column are formed by evaporation through the same evaporation opening 310 on the evaporation mask, and the light emitting areas of the two third sub-pixels are defined by the anode and the cathode. For example, the third sub-pixel (1,1) in the first row and the first column and the third sub-pixel (2,1) in the second row and the first column are formed by evaporation through the same evaporation opening, the third sub-pixel (3,1) in the third row and the first column and the third sub-pixel (4,1) in the fourth row and the first column are formed by evaporation through the same evaporation opening, the third sub-pixel (2,2) in the second row and the second column and the third sub-pixel (3,2) in the third row and the second column are formed by evaporation through the same evaporation opening, and the like. Of course, the third sub-pixels of the first and last rows of the even-numbered columns can be formed by using one evaporation opening, for example, the third sub-pixels (1,2) of the first and second rows correspond to one evaporation opening. As described above, the two third sub-pixels 305 are formed by evaporation through the same evaporation opening 310 on the evaporation mask, which is not limited by the size of Bridge, and the pitch h2 of the two third sub-pixels formed by evaporation through the same evaporation opening 310 can be designed to be smaller (as shown in fig. 3A), so that the opening area of the FFM can be increased, and the aperture ratio can be improved; of course, the strength of the vapor deposition mask plate can be enhanced by increasing the Bridge size H2 under the condition that the aperture ratio is constant.
With continued reference to fig. 3A, the light emitting areas 306 of the third sub-pixels 305 in two adjacent columns on the same row are arranged in a staggered manner, that is, the light emitting areas 306 of the third sub-pixels 305 in two adjacent columns on the same row are not arranged in a straight line, but have a distance h3 in the column direction. In detail, the light emitting areas of the third sub-pixels of the two pixel units in the same pixel group are shifted to the boundary of the two third sub-pixels. For example, in each Pixel unit Pixel, the center line of the light emitting region 306 of the third sub-Pixel 305 does not coincide with the boundary line of the first sub-Pixel 301 and the second sub-Pixel 303. It should be noted that, since two pixel units in the same pixel group share one edge, the shared edge is a boundary line of the two pixel units, but it should be understood that the "boundary" or "boundary line" herein is not limited to a physical "boundary" or "boundary line", but may refer to a virtual "boundary" or "boundary line" between two pixel units.
Further, the light emitting areas of the third sub-pixels of the two pixel units in the same pixel group are distributed in mirror symmetry, that is, the light emitting areas of the third sub-pixels of the two pixel units have the same offset to the boundary line. In detail, the third sub-pixel of the first row and first column pixel unit (1,1) and the third sub-pixel of the first row and second column pixel unit (1,2) are formed by the same evaporation opening, wherein the luminous area of the third sub-pixel of the first row and first column pixel unit (1,1) is shifted downwards, and the luminous area of the third sub-pixel of the first row and second column pixel unit (1,2) is shifted upwards; similarly, the third sub-pixel of the second row and second column pixel unit (2,2) and the third sub-pixel of the third row and second column pixel unit (3,2) are formed by the same evaporation opening, wherein the luminous areas of the third sub-pixels of the second row and second column pixel unit (2,2) are shifted downwards, and the luminous areas of the third sub-pixels of the third row and second column pixel unit (3,2) are shifted upwards. In this way, one of the light emitting areas 306 of the third sub-pixels 305 of two adjacent columns of pixel units on the same row is shifted upward, and the other is shifted downward, so that the two are visually arranged in a staggered manner, thereby effectively improving the display effect. Preferably, the light emitting areas of the third sub-pixels of two pixel units in the same pixel group are mirror-symmetric, that is, the two light emitting areas are equal in size from the boundary of the two pixel units, that is, h10 is h 11.
In this embodiment, the pixel groups in all odd-numbered columns are arranged in the same manner, the pixel groups in all even-numbered columns are arranged in the same manner, and the pixel groups in two adjacent columns are arranged in a staggered manner. Meanwhile, the evaporation openings of the third sub-pixels 305 in two adjacent columns in the evaporation mask are also arranged in a staggered manner. Specifically, the vapor deposition openings 310 on the vapor deposition masks corresponding to the third sub-pixels in all odd-numbered columns are arranged in the same manner, the vapor deposition openings 310 on the vapor deposition masks corresponding to the third sub-pixels in all even-numbered columns are arranged in the same manner, and the vapor deposition openings 310 of the third sub-pixels in the odd-numbered columns and the third sub-pixels in the even-numbered columns on the vapor deposition masks are arranged in a staggered manner, that is, the vapor deposition openings 310 of the third sub-pixels in two adjacent columns on the same row are not arranged in a straight line, but have a pitch H3. Thus, the light emitting regions can be arranged in a staggered manner through the arrangement of the evaporation openings 310, the strength of the evaporation mask can be improved, and the difficulty of the evaporation process can be reduced.
Example two
The difference between this embodiment and the first embodiment is that the first sub-pixels and the second sub-pixels of all the pixel units in the same column are arranged in the same manner, but the first sub-pixels and the second sub-pixels of the pixel units in the same row are arranged in a staggered manner. Specifically, as shown in fig. 4A, the Pixel structure of the OLED display panel includes a plurality of Pixel groups arranged in an array, each Pixel group includes a plurality of Pixel units pixels, each Pixel unit Pixel includes a first sub-Pixel 401, a second sub-Pixel 403, and a third sub-Pixel 405, the first sub-Pixel 401 and the second sub-Pixel 403 are arranged in one column, the third sub-Pixel 405 is arranged in another column, and the first sub-Pixel 401 and the second sub-Pixel 403 of the same row of Pixel units are arranged in a staggered manner on a straight line.
Fig. 4B is a schematic diagram of the FMM of the first sub-pixel of fig. 4A, which includes a shielding region 407 and an evaporation opening 408. Fig. 4C is a schematic diagram of an FMM corresponding to the second sub-pixel of fig. 4A, which includes a shielding region 409 and an evaporation opening 410. As shown in fig. 4B and 4C, since the first sub-pixels 401 and the second sub-pixels 403 of the pixel units in the same row are arranged in a staggered manner on a straight line, the evaporation openings of the first sub-pixels 401 corresponding to the pixel units in the same row are not located on the same straight line, but the evaporation openings corresponding to the first sub-pixels of all the odd-numbered columns of the pixel units in the same row are arranged on a straight line, and the evaporation openings corresponding to the first sub-pixels of all the even-numbered columns of the pixel units in the same row are arranged on another straight line. For example, in fig. 4B, the evaporation openings corresponding to the first sub-pixels (1,1) in the first row and the first column and the evaporation openings corresponding to the third sub-pixels (1,3) in the first row and the third column are arranged on a straight line, and the evaporation openings corresponding to the first sub-pixels (1,2) in the first row and the second column and the evaporation openings corresponding to the first sub-pixels (1,4) in the first row and the fourth column are arranged on another straight line; in fig. 4C, the evaporation openings corresponding to the second sub-pixels (1,1) in the first row and the first column and the evaporation openings corresponding to the second sub-pixels (1,3) in the first row and the third column are arranged on a straight line, and the evaporation openings corresponding to the second sub-pixels (1,2) in the first row and the second column and the evaporation openings corresponding to the second sub-pixels (1,4) in the first row and the fourth column are arranged on another straight line.
EXAMPLE III
The difference between this embodiment and the first embodiment is that the first sub-pixels and the second sub-pixels of all the pixel units in the same row are arranged in the same manner, but the pixel units in two adjacent rows in the same column are mirror-symmetric. As shown in fig. 5A in particular, each Pixel unit Pixel includes a first sub-Pixel 501, a second sub-Pixel 503 and a third sub-Pixel 505, and Pixel units of two adjacent rows in the same column are mirror-symmetrical.
Fig. 5B is a schematic view of the FMM of the R sub-pixel of fig. 5A, which includes a shielding region 507 and an evaporation opening 508. Fig. 5C is a schematic diagram of an FMM corresponding to the G sub-pixel of fig. 5A, which includes a shielding region 509 and an evaporation opening 510. As shown in fig. 5B and 5C, the pixel units in two adjacent rows in the same column are mirror-symmetrical, so that the other rows except for the first row and the last row can be formed by two adjacent rows sharing one evaporation opening. For example, in fig. 5B, the first sub-pixel (2,1) in the second row and the first column and the first sub-pixel (3,1) in the third row and the first column may share the same evaporation opening 508 for evaporation; in fig. 5C, the first sub-pixel (1,1) in the first row and the first column and the first sub-pixel (2,1) in the second row and the first column may share the same vapor deposition opening 510.
Example four
Fig. 6A is a schematic diagram of a pixel arrangement of an OLED display panel in a fourth embodiment of the invention, and fig. 6B is a schematic diagram of an FMM corresponding to the third sub-pixel in fig. 6A.
As shown in fig. 6A, the pixel structure of the OLED display panel includes a plurality of pixel groups arranged in an array, and a pixel array of rows and columns is formed by periodically moving one pixel group. Each Pixel group is composed of a plurality of Pixel units Pixel adjacent to each other on the same column, for example, one Pixel group shown by a dotted line box in fig. 6A is composed of a Pixel unit (2,2) of the second row and the second column, a Pixel unit (3,2) of the third row and the second column, and a Pixel unit (3,2) of the fourth row and the second column. Each Pixel unit Pixel includes a first subpixel 601, a second subpixel 603, and a third subpixel 605, the first subpixel 601 and the second subpixel 603 being arranged in one column, and the third subpixel 605 being arranged in another column. For simplicity, fig. 6A only shows 8 rows by 3 columns of pixel units, but in practice, the number of pixel units may be varied according to actual display requirements, and is not limited to an integer multiple of 3.
As shown in fig. 6B, the FMM corresponding to the third sub-pixel 605 includes a blocking region 609 and an evaporation opening 610. Note that fig. 6B only shows the vapor deposition openings corresponding to 9 rows by 6 columns of pixel cells, but actually, the number of vapor deposition openings may vary depending on the number of pixel cells.
Referring to fig. 6A and 6B, in this embodiment, three adjacent third sub-pixels 605 in the same column are formed by evaporation through the same evaporation opening 610 of the evaporation mask, and the light emitting areas of the two third sub-pixels are defined by the anode and the cathode. In addition, as shown by the dotted circle in fig. 6B, the evaporation openings in two adjacent columns of the evaporation mask are arranged in a staggered manner. The three third sub-pixels 605 are formed by evaporation through the same evaporation opening 610 on the evaporation mask plate, the size of Bridge is not limited, the space design of the third sub-pixels formed by evaporation through the same evaporation opening 610 can be smaller, the opening area of the FFM can be increased, and the opening rate can be improved; of course, the size of the Bridge can be increased under the condition of a certain aperture opening ratio, so that the strength of the evaporation mask plate is enhanced.
For example, the third subpixel (1,1) in the first row and the first column, the third subpixel (2,1) in the second row and the first column, and the third subpixel (3,1) in the third row and the first column are formed by evaporation through the same evaporation opening, the third subpixel (2,2) in the second row and the second column, the third subpixel (3,2) in the third row and the second column, and the third subpixel (4,2) in the fourth row and the second column are formed by evaporation through the same evaporation opening, the third subpixel (3,3) in the third row and the third column, the third subpixel (4,3) in the fourth row and the third column, and the third subpixel (5,3) in the fifth row and the third column are formed by evaporation through the same evaporation opening, and so on. The pixel cells in the edge area may be formed by using one evaporation opening alone or two pixel cells sharing one evaporation opening, depending on the area of the panel. As shown in fig. 6B, the third sub-pixels (1,2) in the first row of the second column are individually corresponding to one evaporation opening, the third sub-pixels in the last two rows of pixel units in the second column are formed by sharing one evaporation opening, the third sub-pixels in the first row of the third column and the third sub-pixels in the second row of pixel units are formed by sharing one evaporation opening, and the third sub-pixels in the last row of pixel units in the third column are formed by individually using one evaporation opening.
As shown in fig. 6A, the light emitting regions 606 of the third sub-pixels 605 in two adjacent columns on the same row are arranged in a staggered manner, that is, the light emitting regions 606 of the third sub-pixels 605 in two adjacent columns on the same row are not arranged in a straight line, but have a pitch in the column direction. In detail, in three pixel units in the same pixel group, the light emitting area of the third sub-pixel of the middle pixel unit is located at the center position of the third sub-pixel, and the light emitting areas of the third sub-pixels of the other two pixel units are shifted to the middle third sub-pixel. For example, the light emitting area of the third sub-pixel of the pixel unit (2,2) of the second row and the second column is shifted downwards, the light emitting area of the third sub-pixel of the pixel unit (3,2) of the third row and the second column is centered, and the light emitting area of the third sub-pixel of the pixel unit (2,2) of the second row and the second column is shifted upwards. Thus, one of the light emitting regions 606 of the third sub-pixels 605 in two adjacent columns on the same row is shifted upward, and the other is shifted downward, so that the two are visually arranged in a staggered manner, thereby effectively improving the display effect. Furthermore, the distance between the light emitting region of the third sub-pixel of the pixel unit (2,2) in the second row and the second column and the boundary of the pixel unit (3,2) in the third row and the second column is h4, the distance between the light emitting region of the third sub-pixel of the pixel unit (3,2) in the third row and the second column and the boundary of the pixel unit (2,2) in the second row and the second column is h5, the distance between the light emitting region of the third sub-pixel of the pixel unit (3,2) in the third row and the second column and the boundary of the pixel unit (4,2) in the fourth row and the second column is h6, the distance between the light emitting region of the third sub-pixel of the pixel unit (4,2) in the fourth row and the second column and the boundary of the pixel unit (3,2) in the third row and the second column is h7, preferably, h5 is h6, h 5639 is h7, and h4 is less than h 5.
In this embodiment, the pixel groups of all 3 rows are arranged in the same manner by multiplying the integer by 1 row, the pixel groups of all 3 rows are arranged in the same manner by multiplying the integer by 2 rows, and the pixel groups of two adjacent rows are arranged in a staggered manner. Therefore, the evaporation openings 610 in three adjacent columns in the evaporation mask plate are arranged in a staggered manner, as shown in fig. 6B, the arrangement manner of the evaporation openings in all 3 columns which are integer times less than 1 column is the same, the arrangement manner of the evaporation openings in all 3 columns which are integer times less than 2 column is the same. Thus, the light emitting areas can be arranged in a staggered manner through the arrangement of the evaporation openings 610, the strength of the evaporation mask can be improved, and the difficulty of the evaporation process can be reduced.
EXAMPLE five
In this embodiment, a method for forming a pixel structure is provided, in which an electroluminescent layer of a corresponding color (red, green, or blue) is formed in a light-emitting region of a pixel region of the corresponding color by using three evaporation processes, wherein a third sub-pixel (e.g., a blue sub-pixel) in the same pixel group is formed by using the same evaporation opening of an evaporation mask.
The pixel structure, the forming method thereof, the OLED display panel and the evaporation mask according to the present invention are described in detail with reference to several embodiments, but it should be understood that the above description is only for the description of the preferred embodiments of the present invention and not for any limitation to the scope of the present invention, and those skilled in the art of the present invention can make any changes and modifications according to the above disclosure, and all fall within the protection scope of the claims. For example, two adjacent third sub-pixels in the same column may be formed by vapor deposition through the same vapor deposition opening on the vapor deposition mask as in the first to third embodiments, three adjacent third sub-pixels in the same column may be formed by vapor deposition through the same vapor deposition opening on the vapor deposition mask as in the fourth embodiment, or four or more adjacent third sub-pixels in the same column may be formed by vapor deposition through the same vapor deposition opening on the vapor deposition mask. Of course, if the length of the third sub-pixel is large, for example, if five or more sub-pixels share the same evaporation opening, the evaporation opening is long in the longitudinal direction, and the FMM is easily deformed by the influence of the magnetic line direction of the magnetic plate during use, and is also easily damaged and deformed during cleaning and storage.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the method disclosed by the embodiment, the description is relatively simple because the method corresponds to the structure disclosed by the embodiment, and the relevant points can be referred to the structural part for description.
Claims (15)
1. A pixel structure comprising a plurality of pixel groups, wherein,
each pixel group consists of a plurality of adjacent pixel units on the same column, each pixel unit comprises a first sub-pixel, a second sub-pixel and a third sub-pixel, the first sub-pixel and the second sub-pixel are arranged in one column, the third sub-pixel is arranged in the other column, and light emitting areas of the third sub-pixels of the adjacent two columns on the same row are arranged in a staggered mode in the column direction; or,
each pixel group is composed of a plurality of adjacent pixel units on the same row, each pixel unit comprises a first sub-pixel, a second sub-pixel and a third sub-pixel, the first sub-pixel and the second sub-pixel are arranged in one row, the third sub-pixel is arranged in the other row, and light emitting areas of the third sub-pixels of two adjacent rows on the same column are arranged in a staggered mode in the row direction.
2. The pixel structure of claim 1, wherein the third sub-pixel in the same pixel group is formed by evaporation through the same evaporation opening of an evaporation mask.
3. The pixel structure according to claim 2, wherein when each pixel group is composed of a plurality of pixel units adjacent to each other on the same column, the evaporation openings of the third sub-pixels in two adjacent columns on the evaporation mask are arranged in a staggered manner in the column direction; when each pixel group consists of a plurality of adjacent pixel units on the same line, the evaporation openings of the third sub-pixels of two adjacent lines on the evaporation mask are arranged in a staggered manner in the line direction.
4. A pixel structure as claimed in claim 1 or 2, characterized in that each pixel group consists of two pixel cells.
5. The pixel structure according to claim 4, wherein the light emitting areas of the third sub-pixels of two pixel units within the same pixel group are shifted toward the boundary of the two third sub-pixels.
6. The pixel structure according to claim 5, wherein the light emitting areas of the third sub-pixels of two pixel units in the same pixel group are mirror-symmetrically distributed along the boundary of the two third sub-pixels.
7. The pixel structure according to claim 4, wherein when each pixel group is composed of a plurality of adjacent pixel units on the same column, the vapor deposition openings of the vapor deposition masks corresponding to the third sub-pixels in the same pixel group in all odd-numbered columns are arranged in the same manner, and the vapor deposition openings of the vapor deposition masks corresponding to the third sub-pixels in the same pixel group in all even-numbered columns are arranged in the same manner; when each pixel group consists of a plurality of adjacent pixel units on the same line, the arrangement modes of the evaporation openings on the evaporation mask plate corresponding to the third sub-pixels in the same pixel group in all odd lines are the same, and the arrangement modes of the evaporation openings on the evaporation mask plate corresponding to the third sub-pixels in the same pixel group in all even lines are the same.
8. A pixel structure as claimed in claim 1 or 2, characterized in that each pixel group consists of three pixel cells.
9. The pixel structure of claim 8, wherein in the three pixel units in the same pixel group, the light emitting area of the third sub-pixel of the middle pixel unit is located at the center of the third sub-pixel, and the light emitting areas of the third sub-pixels of the other two pixel units are shifted toward the middle third sub-pixel.
10. The pixel structure according to claim 9, wherein the light emitting areas of the third sub-pixels of the other two pixel units in the same pixel group are shifted to the middle third sub-pixel by the same amount.
11. The pixel structure according to claim 8, wherein when each pixel group is composed of a plurality of adjacent pixel units in a same row, the arrangement of the evaporation openings on the evaporation mask corresponding to the third sub-pixels in an integral multiple of 3 rows is the same, the arrangement of the evaporation openings on the evaporation mask corresponding to the third sub-pixels in an integral multiple of 3 rows by 1 row is the same, and the arrangement of the evaporation openings on the evaporation mask corresponding to the third sub-pixels in an integral multiple of 3 rows by 2 rows is the same; when each pixel group consists of a plurality of adjacent pixel units on the same line, the arrangement modes of the evaporation openings on the evaporation mask plates corresponding to the third sub-pixels on the integral multiple of all 3 lines are the same, the arrangement modes of the evaporation openings on the evaporation mask plates corresponding to the third sub-pixels on all 3 lines by integer times 1 line are the same, and the arrangement modes of the evaporation openings on the evaporation mask plates corresponding to the third sub-pixels on all 3 lines by integer times 2 line are the same.
12. The pixel structure of claim 1, wherein the first sub-pixel is a red sub-pixel, the second sub-pixel is a green sub-pixel, the third sub-pixel is a blue sub-pixel, and the area of the third sub-pixel is larger than the area of the first and second sub-pixels.
13. An OLED display panel comprising the pixel structure of any one of claims 1-12.
14. An evaporation mask for evaporating the pixel structure of any one of claims 1 to 12.
15. A method for forming a pixel structure according to any one of claims 1 to 12, wherein the third sub-pixel in the same pixel group is formed by evaporation through the same evaporation opening of the evaporation mask.
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