CN107221547B

CN107221547B - Display device

Info

Publication number: CN107221547B
Application number: CN201610163838.1A
Authority: CN
Inventors: 徐怡华; 曾名骏
Original assignee: Innolux Corp
Current assignee: Innolux Corp
Priority date: 2016-03-22
Filing date: 2016-03-22
Publication date: 2020-04-14
Anticipated expiration: 2036-03-22
Also published as: CN107221547A

Abstract

The present invention relates to a display device comprising: a pixel group comprising: a first pixel including only a red sub-pixel and a blue sub-pixel; a second pixel including only a green sub-pixel and a blue sub-pixel, and a third pixel including only a green sub-pixel and a blue sub-pixel; and a fourth pixel respectively comprising a red sub-pixel and a blue sub-pixel, wherein the first pixel and the second pixel are adjacent and arranged along a row direction, the first pixel and the third pixel are adjacent and arranged along a row direction, the fourth pixel is opposite to the first pixel, the fourth pixel is adjacent to the second pixel and the third pixel, in the pixel group, the sum of the number of the blue sub-pixels is larger than the sum of the number of the red sub-pixels, and the sum of the number of the blue sub-pixels is larger than the sum of the number of the green sub-pixels.

Description

Display device

Technical Field

The present invention relates to a display device, and more particularly, to an organic light emitting diode display device having red, green, and blue sub-pixels with special arrangement.

Background

With the continuous progress of display panel technology, the demand for the fineness of the display panel screen in the market is increasing, so that each manufacturer actively develops a higher-order display panel. In particular, as 4K2K panels have emerged and handheld display devices (e.g., cell phones, tablet computers, etc.) are pursuing higher PPI (pixel per inch) resolution, the need to accommodate more pixels per unit area has become a future trend in the panel industry.

Among them, the oled display device is gradually applied to various electronic devices requiring a display screen, such as a display, a mobile phone, a notebook computer, a video camera, a music player, a mobile navigation device, and a television, which need to display images.

In the organic light emitting diode display device capable of emitting red light, green light and blue light, organic materials of all color lights are formed on a substrate in a vapor deposition mode respectively; in the evaporation process, a metal mask is used to form each color sub-pixel. With the development of high PPI resolution display devices, a high-definition metal mask (FMM) is one of the key components of the evaporation process. However, the process of the high-precision metal shield is expensive, which is one of the factors affecting the manufacturing cost of the oled display device.

In addition, in the organic light emitting diode display device capable of emitting red light, green light and blue light, the organic material capable of emitting blue light has poor light emitting efficiency and life, and the display quality of the organic light emitting diode display device is not as good as expected.

In view of the above, there is a need to develop an organic light emitting diode display device that can reduce the manufacturing cost and improve the display quality of the display device to meet the needs of consumers.

Disclosure of Invention

It is a primary object of the present invention to provide a display device having a specific arrangement of red, green and blue sub-pixels to achieve high resolution.

Another objective of the present invention is to provide a display device, which can reduce a high-precision metal mask evaporation process and reduce the manufacturing cost of the display device.

The present invention provides a display device including: a pixel group comprising: a first pixel including only a red sub-pixel and a blue sub-pixel; a second pixel including only a green sub-pixel and a blue sub-pixel, and a third pixel including only a green sub-pixel and a blue sub-pixel; and a fourth pixel including a red sub-pixel and a blue sub-pixel, wherein the first pixel and the second pixel are adjacent and arranged along a row direction, the first pixel and the third pixel are adjacent and arranged along a column direction, the fourth pixel is opposite to the first pixel, the fourth pixel is adjacent to the second pixel and the third pixel, within the pixel group, the sum of the number of the blue sub-pixels is greater than the sum of the number of the red sub-pixels, and the sum of the number of the blue sub-pixels is greater than the sum of the number of the green sub-pixels.

Wherein, the display device of the present invention further comprises: a substrate; a plurality of first electrodes, a plurality of second electrodes and a plurality of third electrodes disposed on the substrate; a red organic material layer disposed on the first electrode; a green organic material layer disposed on the second electrode; a blue organic material layer disposed on the third electrodes, the red organic material layer and the green organic material layer; and a fourth electrode disposed on the blue organic material layer; the first electrodes correspond to the red sub-pixels, the second electrodes correspond to the green sub-pixels, the third electrodes correspond to the blue sub-pixels, the fourth electrode overlaps with the first electrodes, the second electrodes and the third electrodes in a top view direction, and the blue organic material layer overlaps with the red organic material layer and the green organic material layer.

In the display device of the present invention, the first pixel and the fourth pixel respectively include a red sub-pixel and a blue sub-pixel, and the second pixel and the third pixel respectively include a green sub-pixel and a blue sub-pixel. The display device of the invention can realize the purpose of high resolution because of the special sub-pixel arrangement design. In addition, because the first pixel, the second pixel, the third pixel and the fourth pixel simultaneously comprise the blue sub-pixel, the proportion of the blue sub-pixel to the whole display device is the largest, and the problem of poor luminous efficiency of the blue sub-pixel in the organic light-emitting diode is further improved.

In addition, in the display device of the present invention, the red organic material layer is formed on the first electrode, the green organic material layer is formed on the second electrode, and the blue organic material layer is simultaneously formed on the red organic material layer, the green organic material layer, and the third electrode. Therefore, only the high-definition metal mask with different patterns is needed to be used for evaporating the red and green organic material layers, and the other high-definition metal mask is not needed to be used for evaporating the blue organic material layer. Therefore, a vapor deposition process using a high-precision metal shield can be reduced, and the manufacturing cost of the organic light emitting diode device can be reduced.

Drawings

FIG. 1 is a schematic diagram of a metal shield used in one embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of an OLED display device according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a pixel arrangement in an OLED display device according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a pixel arrangement in an OLED display device according to an embodiment of the present invention;

FIG. 5 is a schematic diagram illustrating connection between scan lines, data lines and sub-pixel electrodes of an OLED display device according to an embodiment of the present invention;

fig. 6 is a schematic connection diagram of scan lines, data lines and sub-pixel electrodes of an oled display device according to an embodiment of the invention.

[ notation ] to show

11 opening of metal shield 12

13 Barrier region 21 substrate

221 first electrode 221' first electrode control region

222 second electrode 222' second electrode control region

223 third electrode 223' third electrode control region

223a long side 223b short side

23 hole transport/injection layer 241 Green hole transport layer

242 green light-emitting layer 251 red hole transport layer

252 red light-emitting layer 26 blue organic material layer

27 electron transport layer 28 fourth electrode

31 red sub-pixel 32 green sub-pixel

33 blue sub-pixel A area

The length of the column C from D1 to D6, D8 and D9

Minimum width D10 diameter D7

DL1 first data line DL2 second data line

P1 first pixel P2 second pixel

P3 third pixel P4 fourth pixel

PG pixel group R column direction

SL scanning line

Detailed Description

The following description of the embodiments of the present invention is provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and its several details are capable of modification in various other respects, all without departing from the spirit and scope of the present invention.

Moreover, the use of ordinal numbers such as "first," "second," etc., in the specification and in the claims to modify a claim element is not itself intended to imply any previous ordinal numbers with respect to the claimed element, nor the order in which a claimed element is sequenced from another claimed element or method of manufacture, but rather the use of a given ordinal number merely serves to clearly distinguish one claimed element having a given name from another claimed element having a same name.

FIG. 1 is a schematic diagram of a metal shield used in one embodiment of the present invention; fig. 2 is a schematic cross-sectional view illustrating an oled display device according to an embodiment of the present invention. The method for manufacturing an organic light emitting diode display device according to an embodiment of the invention is roughly described as follows.

As shown in fig. 2, first, a substrate 21 is provided, on which the tft unit and related driving circuits (not shown) are disposed. The substrate 21 may be made of a substrate material such as glass, plastic, resin, sapphire, metal foil (metal foil), or flexible material. Then, a first electrode 221, a second electrode 222 and a third electrode 223 are formed on the substrate 21 as anodes, and the first electrode 221, the second electrode 222 and the third electrode 223 are electrically connected to the corresponding tft device and the related driving circuit, respectively, to control the input of signals. Here, the first electrode 221, the second electrode 222, and the third electrode 223 may be formed in a single-layer or multi-layer structure using a transparent electrode or a reflective electrode. The transparent electrode may be a transparent metal oxide (TCO) electrode, such as an ITO electrode or an IZO electrode; the reflective electrode can be a metal film electrode, such as a magnesium-silver alloy film electrode, a gold film electrode, a silver film electrode, a platinum film electrode, an aluminum film electrode, and the like. The multilayer structure may, for example, be a silver film electrode interposed between two ITO electrodes (ITO-Ag-ITO). Then, a pixel defining layer (not shown) is formed on the first electrode 221, the second electrode 222 and the third electrode 223, the pixel defining layer has a plurality of openings (not shown) corresponding to the first electrode 221, the second electrode 222 and the third electrode 223 to define the areas of the display sub-pixels corresponding to the first electrode 221, the second electrode 222 and the third electrode 223 independently, and the bottom areas of the openings in the top view direction (the normal direction of the substrate) are smaller than the areas of the first electrode 221, the second electrode 222 and the third electrode 223 in the top view direction. The electrode part exposed from the bottom of the opening is a part which can substantially control the light-emitting layer of the organic light-emitting diode (the thickness of the pixel defining layer at the rest is larger than 0, the pixel defining layer separates the electrode and the organic material layer), and is an electrode control area, the shape of the electrode control area and the shape of the corresponding electrode can be the same or different, the electrode control area is smaller than or equal to the area of the electrode and larger than 0, and the electrode control area is substantially equal to the bottommost area of the opening. And then a hole transporting/injecting layer 23. Here, the hole transporting/injecting layer 23 is represented by a single layer only; however, the present invention is not limited thereto, and the hole transporting/injecting layer 23 may have a single-layer or multi-layer structure.

Next, as shown in fig. 1 and fig. 2, using the fine metal mask 11 shown in fig. 1, forming a red organic material layer on the first electrode 221 by an evaporation process, and connecting the red organic material layer to a first electrode control region of the first electrode 221 through the opening of the pixel defining layer corresponding to the red sub-pixel; the red organic material layer includes a red hole transport layer 251 and a red emitting layer 252. Here, the high-precision metal shield 11 has a plurality of openings 12, and the openings 12 correspond to the positions of the first electrodes 221 on the substrate 21, and the red hole transport layer 251 and the red light emitting layer 252 are formed by two evaporation processes. The area of the opening 12, the area of the red hole transporting layer 251 and the area of the red emitting layer 252 are greater than or equal to the area of the first electrode 221. The areas of the red hole transport layer 251 and the red light emitting layer 252 are greater than or equal to the area of the opening 12.

Then, as shown in fig. 2, a green organic material layer is formed on the second electrode 222 by using the metal mask 11 similar to that shown in fig. 1 through an evaporation process, and is connected to a second electrode control region of the second electrode 222 through the opening of the pixel defining layer corresponding to the green sub-pixel; the green organic material layer includes a green hole transport layer 241 and a green emitting layer 242. Here, the design of the high-precision metal shield for forming the green organic material layer is similar to that of the high-precision metal shield for forming the red organic material layer of fig. 1, except that the opening pattern and the arrangement position of the high-precision metal shield for forming the green organic material layer are designed according to the second electrode 222 on the substrate 21. The area of the opening 12, the green hole transporting layer 241 and the green emitting layer 242 is greater than or equal to the area of the second electrode 222. The green hole transporting layer 241 and the green emitting layer 242 have an area greater than or equal to the area of the opening 12. The green organic material layer may or may not overlap with the red organic material layer in a top view direction.

In the present embodiment, the red/green organic material layer has a double-layer structure, wherein the red emitting layer 252/the green emitting layer 242 are mainly layers emitting red/green light, and the red hole transporting layer 251/the green hole transporting layer 241 can adjust the brightness and the color by the thickness or the material. However, the present invention is not limited thereto. In other embodiments of the present invention, the structure of the red/green organic material layer may be a single-layer structure having only the red emitting layer 252/the green emitting layer 242; or, in addition to the red hole transporting layer 251/the green hole transporting layer 241 and the red emitting layer 252/the green emitting layer 242, other multi-layer structures can be provided to help the red/green pixel with light emitting efficiency and color.

Then, as shown in fig. 2, an evaporation process (with or without a low-precision metal mask) is further performed to form a blue organic material layer 26 on the third electrode 223, the green light-emitting layer 242 and the red light-emitting layer 252, and the blue organic material layer 26 is connected to a third electrode control region of the third electrode 223 through the opening of the pixel defining layer corresponding to the blue sub-pixel. The blue organic material layer 26 overlaps the third electrode 223, the green emitting layer 242 and the red emitting layer 252 in the top view direction, and the area of the blue organic material layer 26 in the top view direction is larger than the areas of the first electrode 221, the second electrode 222, the third electrode 223, the red emitting layer 252, the green emitting layer 242 and the opening 12. Here, the blue organic material layer 26 has a single-layer structure; however, the invention is not limited thereto, and the blue organic material layer 26 may have other layers that can help the light emitting efficiency and the color light. Then, an electron transport layer 27 is formed on the blue organic material layer 26; similarly, the electron transport layer 27 of the present embodiment is not limited to a single layer structure, and may have other layers that can contribute to the light emission efficiency. Finally, a fourth electrode 28 is formed on the electron transport layer 27 as a cathode; here, the fourth electrode 28 may also be a single layer (e.g., ITO) or a multi-layer structure (e.g., ITO-Ag) using a transparent electrode or a reflective electrode as described above.

Through the above processes, the organic light emitting diode display device of the present embodiment is obtained, which includes: a substrate 21; a first electrode 221, a second electrode 222 and a third electrode 223 disposed on the substrate 21; a red organic material layer (including a red hole transport layer 251 and a red light emitting layer 252) disposed on the first electrode 221 and electrically connected to the first electrode control region of the first electrode 221 through the corresponding opening of the pixel defining layer; a green organic material layer (including a green hole transport layer 241 and a green emitting layer 242) disposed on the second electrode 222 and electrically connected to the second electrode control region of the second electrode 222 through the corresponding opening of the pixel defining layer; a blue organic material layer 26 disposed on the third electrode 223, the red organic material layer (including the red hole transport layer 251 and the red light emitting layer 252), and the green organic material layer (including the green hole transport layer 241 and the green light emitting layer 242), and electrically connected to the third electrode control region of the third electrode 223 through the corresponding opening of the pixel defining layer; and a fourth electrode 28 disposed on the blue organic material layer 26; the first electrode 221 corresponds to a red sub-pixel (R sub-pixel), the second electrode 222 corresponds to a green sub-pixel (G sub-pixel), and the third electrode 223 corresponds to a blue sub-pixel (B sub-pixel), and the three color sub-pixels form a pixel unit (pixel unit). In other embodiments, the pixel unit may be composed of other color sub-pixels, such as a combination of a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel (RGBW), a combination of a red sub-pixel, a green sub-pixel and two blue sub-pixels (RBGB), a combination of a red sub-pixel, two green sub-pixels and a blue sub-pixel (RGBG), and the like, without limitation.

As described above, when the oled display panel shown in fig. 2 is formed, only the red organic material layer (including the red hole transport layer 251 and the red light emitting layer 252) and the green organic material layer (including the green hole transport layer 241 and the green light emitting layer 242) need to be formed by using the fine metal mask 11 having the opening 12 shown in fig. 1; in forming the blue organic material layer 26, the same low-definition metal mask (Open mask) as that used for forming the hole transporting/injecting layer 23 and the electron transporting layer 27 may be used without using the high-definition metal mask 11 having the opening 12 as shown in fig. 1. Therefore, the high-precision metal mask for forming the blue organic material layer 26 can be omitted, and the process cost can be reduced.

Particularly, as the display panel pursues higher PPI resolution, the opening accuracy and the positioning accuracy of the high-precision metal shield are more important, and the high-precision metal shield is expensive to manufacture, which is tens to hundreds of times the opening shield. Therefore, in the present embodiment, since no additional high-precision metal mask is required for forming the blue organic material layer, the manufacturing cost of the display device can be greatly reduced.

Fig. 3 is a schematic diagram of a pixel arrangement in an oled display device according to an embodiment of the invention. In this embodiment, the display area of the oled display panel of the oled display device is formed by a plurality of pixel groups PG, and each pixel group PG includes: a first pixel P1 comprising a red sub-pixel 31 and at least one blue sub-pixel 33, wherein the blue sub-pixel 33 is located obliquely below the red sub-pixel 31; a second pixel P2 comprising a green sub-pixel 32 and at least one blue sub-pixel 33, wherein the blue sub-pixel 33 is located obliquely below the green sub-pixel 32; a third pixel P3 comprising a green sub-pixel 32 and at least one blue sub-pixel 33, wherein the blue sub-pixel 33 is located obliquely below the green sub-pixel 32; and a fourth pixel P4 comprising a red sub-pixel 31 and at least one blue sub-pixel 33, wherein the blue sub-pixel 33 is located obliquely below the red sub-pixel 31; in the present embodiment, the first pixel P1, the second pixel P1, the third pixel P3 and the fourth pixel P4 each include a blue sub-pixel 33, and in other embodiments, the first pixel P1, the second pixel P1, the third pixel P3 and the fourth pixel P4 each include a plurality of blue sub-pixels 33. The first pixel P1 and the second pixel P2 are adjacent and arranged along a column direction R, the first pixel P1 and the third pixel P3 are adjacent and arranged along a row direction C, the fourth pixel P4 is opposite to the first pixel P1, and the fourth pixel P4 is adjacent to the second pixel P2 and the third pixel P3. In addition, the first pixel P1, the second pixel P1, the third pixel P3 and the fourth pixel P4 form the pixel group PG, and a plurality of pixel groups PG may form a display region in an array manner along a row direction C and a column direction R. Here, the "row direction C" is a longitudinal direction based on the pixel representation shown in fig. 2; the so-called "column direction R" is the lateral direction with respect to the pixel representation shown in fig. 2; the phrase "the blue sub-pixel 33 is located obliquely below the red sub-pixel 31/the green sub-pixel 32" means that the blue sub-pixel 33 is located at the lower half of the red sub-pixel 31/the green sub-pixel 32 and in an oblique direction between the row direction and the column direction. The row direction C and the column direction R may be orthogonal or have an angle different from 90 degrees. The sum of the total number of blue sub-pixels 33 of the single pixel group PG is greater than or equal to the sum of the number of red sub-pixels 31 and the number of green sub-pixels 32, the sum of the number of blue sub-pixels 33 may be twice or more than the sum of the number of red sub-pixels 31, and the sum of the number of blue sub-pixels 33 may be twice or more than the sum of the number of green sub-pixels 32. The organic light emitting diode display panel of the organic light emitting diode display device also has a peripheral area which is positioned outside and surrounds the display area, and the peripheral area can be provided with a small number of red sub-pixels, green sub-pixels or blue sub-pixels which are arranged at the edge of the adjacent display area and are not used for displaying but used as dummy sub-pixels (dummy sub-pixels) matched with the edge, and the sum of the number of the dummy blue sub-pixels positioned in the peripheral area is larger than or equal to the sum of the number of the dummy red sub-pixels and the number of the dummy green sub-pixels.

In this embodiment, in the same row direction R, the red sub-pixel 31 and the blue sub-pixel 33 of the first pixel P1, and the green sub-pixel 32 and the blue sub-pixel 33 of the adjacent second pixel P2 are electrically connected to the same scan line (scan line) by their corresponding tfts, the red sub-pixel 31 of the first pixel P1 and the green sub-pixel 32 of the second pixel P2 are located on the same side of the scan line, and the blue sub-pixel 33 of the first pixel P1 and the blue sub-pixel 33 of the second pixel P2 are located on the other side of the scan line. In other embodiments, the red sub-pixel 31 of the first pixel P1 and the green sub-pixel 32 of the adjacent second pixel P2 are electrically connected to a scan line by their corresponding tfts, the red sub-pixel 31 of the first pixel P1 and the green sub-pixel 32 of the second pixel P2 can be located on the same side of the scan line or on two different sides of the scan line, the blue sub-pixel 33 of the first pixel P1 and the blue sub-pixel 33 of the adjacent second pixel P2 are electrically connected to another scan line by their corresponding tfts, and the blue sub-pixel 33 of the first pixel P1 and the blue sub-pixel 33 of the adjacent second pixel P2 can be located on the same side of the another scan line or on two different sides of the another scan line. In other embodiments, the red sub-pixel 31 and the blue sub-pixel 33 of the first pixel P1, and the green sub-pixel 32 and the blue sub-pixel 33 of the adjacent second pixel P2 are electrically connected to different scan lines by their corresponding tfts. The scan lines extend in a column direction R.

In this embodiment, in the same row direction C, the red sub-pixel 31 of the first pixel P1 and the green sub-pixel 32 of the adjacent third pixel P32 are electrically connected to the same data line (data line) by respective corresponding tfts, the red sub-pixel 31 of the first pixel P1 and the green sub-pixel 32 of the third pixel P3 can be located on the same side of the data line or on different sides of the data line, the blue sub-pixel 33 of the first pixel P1 and the blue sub-pixel 33 of the adjacent third pixel P3 are electrically connected to another data line by respective corresponding tfts, and the blue sub-pixel 33 of the first pixel P1 and the blue sub-pixel 33 of the third pixel P3 can be located on the same side of the data line or on different sides of the data line. In other embodiments, the red sub-pixel 31 and the blue sub-pixel 33 of the first pixel P1 are electrically connected to another data line by their corresponding tfts, the red sub-pixel 31 and the blue sub-pixel 33 of the first pixel P1 can be located on the same side of the data line or on different sides, the green sub-pixel 32 and the blue sub-pixel 33 of the adjacent third pixel P3 are electrically connected to another data line by their corresponding tfts, and the green sub-pixel 32 and the blue sub-pixel 33 of the second pixel P2 can be located on the same side of the data line or on different sides. In other embodiments, the red sub-pixel 31 and the blue sub-pixel 33 of the first pixel P1, and the green sub-pixel 32 and the blue sub-pixel 33 of the adjacent second pixel P2 are electrically connected to different data lines by their corresponding tfts. The data lines extend in a row direction C.

The first electrode control region 221 ' (bottom of the first opening of the planarization layer) corresponding to the red sub-pixel 31 and the second electrode control region 222 ' (bottom of the second opening of the planarization layer) corresponding to the green sub-pixel 32 are substantially diamond-shaped, and the third electrode control region 223 ' (bottom of the third opening of the planarization layer) corresponding to the blue sub-pixel 33 is substantially parallelogram-shaped. A diamond, parallelogram, or other figure such as a circle, trapezoid, rectangle, square, etc. that substantially represents the outline of the figure may include some slight edge deformation and rounded corners at the vertices. In particular, the third electrode control region 223' corresponding to the blue sub-pixel 33 has a long side 223a and a short side 223 b. In the present embodiment, the long side 223a of the third electrode control area 223 'is adjacent to the red sub-pixel 31, and the short side 223b is adjacent to the green sub-pixel 32, in other embodiments, the long side 223a of the third electrode control area 223' is adjacent to the green sub-pixel 32, and the short side 223b is adjacent to the red sub-pixel 31. The diamond pattern of the first electrode control region 221 'corresponding to the red sub-pixel 31 and the second electrode control region 222' corresponding to the green sub-pixel 32 may also have a major axis and a minor axis, in this embodiment, the major axis may face the row direction C and the minor axis may face the column direction R, in other embodiments, the major axis may face the column direction R and the minor axis may face the row direction C.

In addition, in the present embodiment, the red sub-pixel 31 of the first pixel P1 and the green sub-pixel 32 of the third pixel P3 in the pixel group PG are staggered along the row direction C to form a zigzag arrangement, that is, the center point of the first electrode control region 221 'of the red sub-pixel 31 of the first pixel P1 and the center point of the second electrode control region 222' of the green sub-pixel 32 of the third pixel P3 are staggered and arranged along the row direction C. The blue sub-pixels 33 of the first pixel P1 and the third pixel P3 are arranged in a zigzag manner along the row direction C, that is, the long axis direction of the third electrode control region 223 'of the blue sub-pixel 32 of the first pixel P1 is different from (has different orientation and included angle with) the long axis direction of the third electrode control region 223' of the blue sub-pixel 32 of the third pixel P3, and the arrangement is staggered and zigzag when viewed along the row direction C; in particular, in the row direction C, the blue sub-pixel 33 of the first pixel P1 and the blue sub-pixel 33 of the third pixel P3 are adjacent to each other.

Fig. 4 is a schematic diagram of a pixel arrangement in an oled display device according to another embodiment of the present invention. The manufacturing method of the display device of the present embodiment is the same as that described above, and therefore, the description thereof is omitted. In addition, the pixel arrangement of the display device of the present embodiment is similar to that of the display device shown in fig. 3, and the main difference is the pixel sizes of the red sub-pixel 31, the green sub-pixel 32, and the blue sub-pixel 33 and the corresponding electrode pattern designs.

As shown in fig. 4, in the display device of the present embodiment, the first electrode control region 221 ' corresponding to the red sub-pixel 31 and the second electrode control region 222 ' corresponding to the green sub-pixel 32 are rectangular, and the third electrode control region 223 ' corresponding to the blue sub-pixel 33 is circular.

As shown in fig. 3 and 4, the oled display device of the present embodiment has a special sub-pixel arrangement design, so as to achieve the purpose of high resolution. In addition, in the oled display device of the present embodiment, in a pixel group PG, since the first pixel P1, the second pixel P2, the third pixel P3 and the fourth pixel P4 each include a blue sub-pixel 33, the overall ratio of the blue sub-pixel 33 in the display device can be increased; in particular, the sum of the light emitting areas of the blue sub-pixels 33 may be equal to or greater than the sum of the light emitting areas of the red sub-pixels 31 and the green sub-pixels 32, respectively. Preferably, the sum of the light-emitting areas of the blue sub-pixel 33 is larger than the sum of the light-emitting areas of the red sub-pixel 31 and the green sub-pixel 32, as shown in fig. 3; thus, the problem of poor luminous efficiency of the blue organic luminescent material can be solved. The light-emitting area is defined as the area of the electrode control area, and the electrode capable of controlling the light-emitting layer is the electrode control area exposed from the bottom of the opening of the pixel defining layer.

When the pixel arrangement shown in fig. 3 and 4 is used to fabricate a display device with a pixel size of 48 × 48 μm2, the following parameters can be used. The area a shown in fig. 3 and 4 is the area for calculating a pixel size; in fig. 3, the region a is a rectangle formed by diagonal lines of the leftmost vertex of the red subpixel 31 in the column direction R and the rightmost vertex of the green subpixel 32 in the column direction R, viewed from the adjacent red subpixel 31 and green subpixel 32; in fig. 4, the vertex of the region a is the center point of the first electrode control region 221 'of the adjacent red sub-pixel 31 and the center point of the second electrode control region 222' of the green sub-pixel 32; the lengths D1 and D2 of the region A in the row direction C and the column direction R are 48 μm, respectively.

In one embodiment shown in fig. 3, the first electrode control region 221 'corresponding to the red sub-pixel 31 and the second electrode control region 222' corresponding to the green sub-pixel 32 are diamond-shaped and have the same size; therefore, only the second electrode control region 222' will be described herein. The diagonal length D3 (minor axis) of the second electrode control region 222' corresponding to the green sub-pixel 32 is 12.5 μm, and the other diagonal length D4 (major axis) is 23 μm. The third electrode control region 223' corresponding to the blue sub-pixel 33 is shaped like a parallelogram, and the length D5 of the long side 223a is 26 μm, while the length D6 of the short side 223b is 6 μm.

In addition, as shown in fig. 1 and 3, the blocking region 13 between the two openings 12 of the metal shield 11 for forming the red sub-pixel 31 corresponds to the blue sub-pixel 33 and the third electrode control region 223' thereof. If the minimum width D7 of the barrier region 13 is too small, the barrier region 13 is easily broken, and the metal shield 11 is damaged. Considering the deposition accuracy (Tolerance) and the minimum width D7, when the deposition accuracy is 10 μm, the minimum width D7 is 26 μm (length D6+2 × 10 μm). Since the high-definition metal shielding features used in the green sub-pixel 32 and the red sub-pixel 31 are the same, they are not described in detail herein.

In another embodiment shown in fig. 4, the first electrode control region 221 'corresponding to the red sub-pixel 31 and the second electrode control region 222' corresponding to the green sub-pixel 32 are rectangular and have the same size; therefore, only the second electrode control region 222' will be described herein. The second electrode control region 222' corresponding to the green sub-pixel 32 is approximately rectangular, and the lengths D8 and D9 of the two side edges are 15 μm respectively. The third electrode control region 223' corresponding to the blue sub-pixel 33 is approximately circular and has a diameter D10 of 12 μm. Similarly, in consideration of the deposition accuracy and the minimum width of the metal barrier rib to be used, when the deposition accuracy is 10 μm, the minimum width of the metal barrier rib is 32 μm (diameter D10+2 × 10 μm).

When the light emitting area calculation was performed by the display device of the embodiment shown in fig. 3 and 4 under the aforementioned conditions, the results are shown in table 1 below.

TABLE 1

The results in Table 1 show that when the pixel arrangement shown in FIG. 3 is used, the total light-emitting area of the blue sub-pixel 33 is larger than the total light-emitting area of the red sub-pixel 31 and the green sub-pixel 32, so that the problem of poor light-emitting efficiency of the blue organic light-emitting material can be solved.

Here, only the size of one possible metal shield 11, first electrode control region 221 ', second electrode control region 222 ' and third electrode control region 223 ' is provided; however, the present invention is not limited thereto. The dimensions of the metal shield 11, the first electrode control region 221 ', the second electrode control region 222 ' and the third electrode control region 223 ' can be adjusted and changed according to the pixel size and the product requirement.

FIG. 5 is a schematic diagram illustrating connection between scan lines, data lines and sub-pixel electrodes of an OLED display device according to an embodiment of the present invention; which is applicable to a display device having the pixel arrangement shown in fig. 3 and 4. As shown in fig. 5, the display device of the present embodiment further includes a scan line SL, a first data line DL1 and a second data line DL2, wherein the scan line SL intersects with the first data line DL1 and the second data line DL2, the scan line SL extends along the column direction R, and the first data line DL1 and the second data line DL2 extend along the row direction C; the scan line SL is electrically connected to the red sub-pixel 31 and the blue sub-pixel 33 of the first pixel P1, and the green sub-pixel 32 and the blue sub-pixel 33 of the second pixel P2 through respective tfts, the red sub-pixel 31 and the green sub-pixel 32 are located at one side of the scan line SL, and the blue sub-pixel 33 is located at the other side of the scan line SL; the first data line DL1 is electrically connected to the red sub-pixel 31 of the first pixel P1 and the green sub-pixel 32 of the third pixel P3 through respective tfts, and the red sub-pixel 31 and the green sub-pixel 32 are both located on the same side of the first data line DL 1; the second data line DL2 is electrically connected to the blue sub-pixels 33 of the first pixel P1 and the third pixel P3 through the respective tfts, and the blue sub-pixels 33 are located on the same side of the second data line DL 2.

Here, the scan line SL, the first data line DL1 and the second data line DL2 are only used to indicate the electrical connection and signal transmission between the sub-pixels; rather than the actual shapes of the scan line SL, the first data line DL1 and the second data line DL 2. The shapes of the scan line SL, the first data line DL1 and the second data line DL2 can be adjusted and changed according to the design of the display device.

FIG. 6 is a schematic diagram illustrating connection between scan lines, data lines and sub-pixel electrodes of an OLED display device according to an embodiment of the present invention; which is applicable to a display device having the pixel arrangement shown in fig. 3 and 4. As shown in fig. 6, the display device of the present embodiment further includes a scan line SL, a first data line DL1 and a second data line DL2, wherein the scan line SL crosses the first data line DL1 and the second data line DL2 through respective tfts, the scan line SL extends along the column direction R, and the first data line DL1 and the second data line DL2 extend along the row direction C; the scan line SL is electrically connected to the red subpixel 31 and the blue subpixel 33 of the first pixel P1, and the green subpixel 32 and the blue subpixel 33 of the second pixel P2, wherein the red subpixel 31 and the green subpixel 32 are located at one side of the scan line SL, and the blue subpixel 33 is located at the other side of the scan line SL; the first data line DL1 is electrically connected to the red sub-pixel 31 of the first pixel P1 and the green sub-pixel 32 of the third pixel P3 through respective tfts, the red sub-pixel 31 is located at one side of the first data line DL1, and the green sub-pixel 32 is located at the other side of the first data line DL 1; the second data line DL2 is electrically connected to the blue sub-pixels 33 of the first pixel P1 and the third pixel P3 through the thin film transistors, and the blue sub-pixels 3 are located on the same side of the second data line DL 2.

In addition, the display device manufactured by the foregoing embodiment of the invention can also be used in combination with a touch panel as a touch display device. Meanwhile, the display device or the touch display device manufactured in the foregoing embodiment of the invention may be applied to any electronic device that needs a display screen and is known in the art, such as a display, a mobile phone, a notebook computer, a video camera, a music player, a mobile navigation device, a television, and other electronic devices that need to display images.

The above-described embodiments are merely exemplary for convenience in explanation, and the scope of the claims of the present invention should be determined by the claims rather than by the limitations of the above-described embodiments.

Claims

1. A display device, comprising:

a pixel group comprising:

a first pixel including only a red sub-pixel and a blue sub-pixel

A second pixel including only a green sub-pixel and a blue sub-pixel;

a third pixel including only a green sub-pixel and a blue sub-pixel; and

a fourth pixel including only a red sub-pixel and a blue sub-pixel;

a scanning line extending in a row direction;

a first data line extending in a row direction; and

a second data line extending in the row direction,

the first pixel and the second pixel are adjacent and arranged along the row direction, the first pixel and the third pixel are adjacent and arranged along the column direction, the fourth pixel is opposite to the first pixel, and the fourth pixel is adjacent to the second pixel and the third pixel;

in the pixel group, the sum of the numbers of the blue sub-pixels is greater than the sum of the numbers of the red sub-pixels, and the sum of the numbers of the blue sub-pixels is greater than the sum of the numbers of the green sub-pixels;

the scan line is electrically connected to the red sub-pixel and the blue sub-pixel of the first pixel, the scan line is electrically connected to the green sub-pixel and the blue sub-pixel of the second pixels, the first data line is electrically connected to the red sub-pixel of the first pixel and the green sub-pixel of the third pixel, and the second data line is electrically connected to the blue sub-pixel of the first pixel and the blue sub-pixel of the third pixel.

2. The display apparatus of claim 1, wherein the red sub-pixel of the first pixel, the blue sub-pixel of the first pixel, the green sub-pixel of the third pixel, and the blue sub-pixel of the third pixel are staggered in the row direction.

3. The display apparatus of claim 1, wherein in the row direction, the red sub-pixel of the first pixel, the blue sub-pixel of the first pixel, the green sub-pixel of the second pixel, and the blue sub-pixel of the second pixel are staggered in a zigzag manner.

4. The display device of claim 2, wherein the blue sub-pixel of the second pixel and the blue sub-pixel of the fourth pixel are adjacent to each other, and the blue sub-pixel of the first pixel and the blue sub-pixel of the third pixel are adjacent to each other.

5. The display apparatus of claim 1, wherein a total of light-emitting areas of the blue sub-pixels in the pixel group is larger than a total of light-emitting areas of the red sub-pixels and a total of light-emitting areas of the green sub-pixels.

6. The display apparatus of claim 1, wherein in the pixel group, the sum of the numbers of the blue sub-pixels is twice the sum of the numbers of the red sub-pixels, and the sum of the numbers of the blue sub-pixels is twice the sum of the numbers of the green sub-pixels.

7. The display device of claim 1, wherein the red sub-pixel of the first pixel and the green sub-pixel of the second pixel electrically connected to the scan line are located at one side of the scan line, and the blue sub-pixel of the first pixel and the blue sub-pixel of the second pixel electrically connected to the scan line are located at the other side of the scan line.

8. The display device of claim 1, wherein the red sub-pixel of the first pixel electrically connected to the first data line is located at one side of the first data line, and the green sub-pixel of the third pixel electrically connected to the first data line is located at the other side of the first data line.

9. The display device of claim 1, further comprising:

a substrate;

a plurality of first electrodes, a plurality of second electrodes and a plurality of third electrodes disposed on the substrate;

a red organic material layer disposed on the first electrodes;

a green organic material layer disposed on the second electrodes;

a blue organic material layer disposed on the third electrodes, the red organic material layer and the green organic material layer; and

a fourth electrode disposed on the blue organic material layer;

the first electrodes correspond to the red sub-pixels, the second electrodes correspond to the green sub-pixels, the third electrodes correspond to the blue sub-pixels, the fourth electrode overlaps with the first electrodes, the second electrodes and the third electrodes in a top view direction, and the blue organic material layer overlaps with the red organic material layer and the green organic material layer.