CN112420785A

CN112420785A - OLED display panel

Info

Publication number: CN112420785A
Application number: CN202011222607.6A
Authority: CN
Inventors: 曹蔚然; 韩佰祥; 张留旗
Original assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2020-11-05
Filing date: 2020-11-05
Publication date: 2021-02-26
Anticipated expiration: 2040-11-05
Also published as: CN112420785B

Abstract

The application discloses OLED display panel, this OLED display panel includes: the pixel matrix is composed of a plurality of pixel points, each pixel point comprises two sub-pixels with different colors, and the pixel matrix comprises a first direction and a second direction. Two adjacent sub-pixels of any two adjacent pixel points arranged along the first direction have the same color, and any two adjacent sub-pixels arranged along the second direction have different colors. The geometric centers of two sub-pixels forming the same pixel point are arranged along a third direction, the third direction is positioned on a plane formed by the first direction and the second direction, and the third direction is not parallel to the first direction and the second direction. The method and the device can be compatible with the Pentile technology and the line bank printing technology.

Description

OLED display panel

Technical Field

The application relates to the field of electronic display, in particular to an OLED display panel.

Background

As the resolution of Organic Light Emitting Diode (OLED) displays is higher and higher, in order to reduce the process difficulty, a person skilled in the art proposes a novel pixel arrangement method: pentile comes from the birth-unlike the traditional pixel (consisting of three red, green and blue sub-pixels), in the Pentile pixel arrangement, a single pixel consists of two colors of red, green and blue, and three primary colors are formed by borrowing another color from the adjacent pixels. Because there are only two sub-pixels in each pixel of Pentile, the process difficulty can be reduced, and the progress of mass production of high-resolution panels is promoted.

However, the Pentile pixel arrangement has a great defect: line bank printing technology is not compatible. At present, an OLED display screen forms a single pixel unit by adopting an ink-jet printing method, the position of each opening needs to be accurately positioned during printing, and the requirement on precision is high. The Line bank printing technology connects a row of pixels with the same color together through a strip-shaped mask, and uniform printing is achieved, so that the requirement of ink-jet printing on precision can be reduced, and the process difficulty is reduced. Referring to fig. 1 and 2, fig. 1 shows a Pentile pixel arrangement in the prior art, wherein each pixel P includes two sub-pixels with different colors. Typically, each pixel P includes a green sub-pixel 020, and the other pixel is any one of a red sub-pixel 010 and a blue sub-pixel 030. FIG. 2 is a cross-sectional view of a sub-pixel along direction AA' in FIG. 1, wherein 032 is a substrate including an encapsulated transistor layer, 034 is an anode of the sub-pixel, and 036 is a pixel defining layer of the sub-pixel. In order to ensure that each pixel point P can completely display three colors of red, green and blue, the sub-pixels located in the same row or the same column at least include two different colors. Therefore, the Pentile pixel arrangement in the prior art is not compatible with the line bank printing technology.

Disclosure of Invention

The application provides an OLED display panel compatible with Pentile technology and Line bank technology.

The OLED display panel comprises a pixel matrix formed by a plurality of pixel points, each pixel point comprises two sub-pixels with different colors, and the pixel matrix comprises a first direction and a second direction; the two adjacent sub-pixels of any two adjacent pixel points arranged along the first direction have the same color, and any two adjacent sub-pixels arranged along the second direction have different colors; the geometric centers of two sub-pixels forming the same pixel point are arranged along a third direction, the third direction is positioned on a plane formed by the first direction and the second direction, and the third direction is not parallel to the first direction and the second direction.

According to a specific embodiment of the present invention, the first direction is perpendicular to the second direction, a first included angle is formed between the third direction and the first direction, and the first included angle is greater than or equal to 30 degrees and less than or equal to 60 degrees; and a second included angle is formed between the third direction and the second direction, and the second included angle is greater than or equal to 30 degrees and less than or equal to 60 degrees.

According to an embodiment of the present invention, the first included angle is less than or equal to 60 degrees, and the second included angle is less than or equal to 60 degrees.

According to a specific embodiment of the present invention, the first included angle and the second included angle are both 45 degrees.

According to a specific embodiment of the present invention, the plurality of sub-pixels having the same color are arranged in a row along the fourth direction, and the geometric centers of the plurality of sub-pixels located in the same row are located on the same straight line.

According to a specific embodiment of the present invention, the fourth direction is located on a plane formed by the first direction and the second direction, and the fourth direction is perpendicular to the third direction.

According to an embodiment of the present invention, the plurality of sub-pixels are axisymmetric patterns, and at least one symmetry axis of the axisymmetric patterns is parallel to the fourth direction.

According to an embodiment of the present invention, each of the sub-pixels includes:

a substrate comprising a thin-film transistor layer;

an anode on the substrate;

a first pixel defining layer covering the substrate and having a first opening exposing the anode;

a second pixel defining layer covering the first pixel defining layer and having a second opening exposing the first opening and a portion of the first pixel layer.

According to an embodiment of the present invention, the plurality of sub-pixels have the same structure and area.

According to an embodiment of the invention, the plurality of sub-pixels are projected to be circular on the light emitting surface of the OLED display panel.

According to an embodiment of the present invention, one of the sub-pixels in each pixel is a green sub-pixel, and the other sub-pixel is any one of a red sub-pixel or a blue sub-pixel.

The arrangement mode, the arrangement position and the relative angle of the sub-pixels in the Pentile pixel arrangement structure are adjusted, so that the sub-pixels with the same color are arranged in a row along the same direction, and the sub-pixel array can be printed line by using a line bank technology. The OLED display panel can be compatible with the Pentile technology and the line bank printing technology, and compared with the prior art, the process difficulty of the OLED display panel is effectively reduced.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

FIG. 1 is a partial schematic view of a prior art Pentile pixel arrangement;

FIG. 2 is a cross-sectional view of one of the sub-pixels of FIG. 1 along direction AA';

FIG. 3 is a schematic diagram of an OLED display panel according to the present invention;

FIG. 4 is a schematic diagram of the sub-pixel arrangement shown in FIG. 3;

fig. 5 is a cross-sectional view of one of the sub-pixels in fig. 4 along a direction perpendicular to the light exit surface of the OLED display panel.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

The following description of the various embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments that can be implemented by the application. Directional phrases used in this application, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], etc., refer only to the directions of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and understanding, and is in no way limiting. In the drawings, elements having similar structures are denoted by the same reference numerals.

Referring to fig. 3, the present invention provides an OLED display panel 100 including a pixel matrix 100A composed of a plurality of pixel points B. Each pixel point B comprises two sub-pixels with different colors. The plurality of sub-pixels constituting the pixel matrix 100A include a red sub-pixel 110, a green sub-pixel 120, and a blue sub-pixel 130. Two sub-pixels with different colors form a pixel point B. Referring to fig. 3, in one repeating unit a in the present embodiment, there are 3 × 6 pixel points B, where the arrangement sequence of the sub-pixels in each row is: 110/120/120/130/130/110&130/110/110/120/120/130&120/130/130/110/110/120&130/110/110/120/120/130&120/130/130/110/110/120& 110/120/120/130/130/110. The arrangement sequence of the sub-pixels can be flexibly adjusted according to requirements. For example, in another embodiment of the present invention, there are 3 × 6 pixels B in one repeating unit a, wherein the arrangement sequence of the sub-pixels in each row is: 110/120/130/110/120/130&130/110/120/130/110/120&120/130/110/120/130/110&110/120/130/110/120/130&130/110/120/130/110/120& 120/130/110/120/130/110. The arrangement of the sub-pixels is not limited to the arrangement in the two embodiments, and may be adjusted in practice according to the need.

In this embodiment, the pixel matrix 100A includes a first direction D1 and a second direction D2. In general, for a rectangular display panel, the first direction D1 and the second direction D2 are directions in which two sets of parallel sides of the OLED display panel 100 extend, respectively. Any two adjacent sub-pixels of any two adjacent pixel points B arranged along the first direction D1 have the same color, and any two adjacent sub-pixels arranged along the second direction D2 have different colors. As shown in fig. 3, two sub-pixels in each pixel point are arranged along the first direction D1. Pixel B includes a red subpixel 110 and a green subpixel 120, and pixel B1 located to the right of pixel B includes a green subpixel 120 and a blue subpixel 130, wherein the green subpixel 120 is adjacent to the green subpixel 120 of pixel B. The pixel B2 below the pixel B includes a blue sub-pixel 130 and a red sub-pixel 110, the blue sub-pixel 130 is located below the red sub-pixel 110 of the pixel B, and the red sub-pixel 110 is located below the green sub-pixel 120 of the pixel B. This arrangement ensures that each subpixel B can borrow a third color from the adjacent pixels, so that the pixels in the OLED display panel 100 form a Pentile arrangement.

Referring to fig. 4, fig. 4 is a schematic view of the arrangement of the sub-pixels of the pixel matrix 100A in fig. 3, in this embodiment, geometric centers of two sub-pixels constituting the same pixel point B are arranged along a third direction D3, the third direction D3 is located on a plane formed by the first direction D1 and the second direction D2, and the third direction D3 is not parallel to the first direction D1 and the second direction D2. The arrangement is such that a plurality of sub-pixels having the same color are arranged in a row along the fourth direction D4, and the geometric centers of the plurality of sub-pixels located in the same row are located on the same straight line. The fourth direction D4 is located on a plane formed by the first direction D1 and the second direction D2, and the fourth direction D4 is perpendicular to the third direction D3.

The arrangement direction of the sub-pixels of the Pentile pixel matrix in the prior art generally coincides with the first direction D1 and the second direction D2, so that the sub-pixels having the same color cannot be located in the same row, and the line bank printing technology cannot be applied. The arrangement shown in fig. 3 and 4 is equivalent to rotating the pixel matrix 100A such that two arrangement directions of the pixel matrix 100A do not coincide with the boundary of the OLED display panel 100, so that sub-pixels having the same color can be arranged in a line along the fourth direction D4 for line bank printing.

In the invention, the first direction D1 is perpendicular to the second direction D2, and the third direction D3 has a first included angle with the first direction D1, where the first included angle is greater than or equal to 30 degrees; a second included angle is formed between the third direction D3 and the second direction D2, and the second included angle is smaller than or equal to 30 degrees. Further, the first included angle is less than or equal to 60 degrees, and the second included angle is less than or equal to 60 degrees. The first included angle and the second included angle are too large or too small, which increases the difficulty of arranging the sub-pixels of the OLED display panel 100 and the image display effect. In this embodiment, the first included angle and the second included angle are both 45 degrees.

In the present embodiment, the fourth direction D4 is perpendicular to the third direction D3. Of course, in other embodiments, the included angle between the fourth direction D4 and the third direction D3 may be adjusted according to the size, shape, arrangement of the sub-pixels and the relative positions between the sub-pixels. The angle between the fourth direction D4 and the third direction D3 can be set according to actual needs as long as it can ensure that the sub-pixels with the same color are arranged in a row along the fourth direction as shown in fig. 4.

In the present invention, the plurality of sub-pixels are axisymmetric patterns, and at least one symmetry axis of the axisymmetric patterns is parallel to the fourth direction D4. The plurality of sub-pixels have the same structure and area. In this embodiment, in order to facilitate line bank printing and alignment, the plurality of sub-pixels are projected to be circular on the light emitting surface of the OLED display panel 100. This is due to the fact that a circle has an infinite number of axes of symmetry, facilitating alignment of the sub-pixels in the fourth direction. In this embodiment, one of the sub-pixels in each pixel B is a green sub-pixel 120, and the other sub-pixel is any one of a red sub-pixel 110 or a blue sub-pixel 130.

Referring to fig. 5, fig. 5 is a cross-sectional view of one sub-pixel in fig. 4 along a direction perpendicular to a light exit surface of the OLED display panel. In this embodiment, each of the sub-pixels B includes: a substrate 132, an anode 134, a first pixel defining layer 138, and a second pixel defining layer 136. The substrate 132 includes a thin-film transistor layer, and the anode 134 is located on the substrate 132. The first pixel defining layer 138 covers the substrate 132 and has a first opening exposing the anode electrode 134, and the second pixel defining layer 136 covers the first pixel defining layer 138 and has a second opening exposing the first opening and a portion of the first pixel layer 138. The first pixel defining layer 138 and the second pixel defining layer 136 form two pixel defining structures for line bank printing, so that the Pentile pixel arrangement structure in the invention can be printed line by line, and compared with the prior art, the process difficulty of the OLED display panel is effectively reduced.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The foregoing describes in detail an electronic device provided in an embodiment of the present application, and a specific example is applied to illustrate the principle and the implementation of the present application, and the description of the foregoing embodiment is only used to help understanding the technical solution and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. An OLED display panel comprising a pixel matrix formed by a plurality of pixel points, each of said pixel points comprising two sub-pixels having different colors, said pixel matrix comprising a first direction and a second direction; the two adjacent sub-pixels of any two adjacent pixel points arranged along the first direction have the same color, and any two adjacent sub-pixels arranged along the second direction have different colors;

the geometric centers of two sub-pixels forming the same pixel point are arranged along a third direction, the third direction is positioned on a plane formed by the first direction and the second direction, and the third direction is not parallel to the first direction and the second direction.

2. The OLED display panel of claim 1, wherein the first direction and the second direction are perpendicular, the third direction has a first included angle with the first direction, and the first included angle is greater than or equal to 30 degrees and less than or equal to 60 degrees; and a second included angle is formed between the third direction and the second direction, and the second included angle is greater than or equal to 30 degrees and less than or equal to 60 degrees.

3. The OLED display panel of claim 2, wherein the first included angle and the second included angle are both 45 degrees.

4. The OLED display panel of claim 2, wherein the plurality of sub-pixels having the same color are arranged in a row along a fourth direction, and the geometric centers of the plurality of sub-pixels in the same row are located on the same line.

5. The OLED display panel of claim 4, wherein the fourth direction is in a plane formed by the first direction and the second direction, and wherein the fourth direction is perpendicular to the third direction.

6. The OLED display panel of claim 5, wherein the plurality of sub-pixels are in an axisymmetric pattern, at least one axis of symmetry of the axisymmetric pattern being parallel to the fourth direction.

7. The OLED display panel of claim 6, wherein each of the sub-pixels comprises:

a substrate comprising a thin-film transistor layer;

an anode on the substrate;

8. The OLED display panel of claim 1, wherein the plurality of sub-pixels have the same structure and area.

9. The OLED display panel of claim 8, wherein the plurality of sub-pixels are projected as a circle on the light exit surface of the OLED display panel.

10. The OLED display panel of claim 8, wherein one of the sub-pixels in each pixel is a green sub-pixel, and the other sub-pixel is any one of a red sub-pixel or a blue sub-pixel.