Pixel structure, OLED display screen and evaporation mask

1. A pixel structure, comprising a plurality of pixel unit groups arranged in an array, wherein

each of the pixel unit groups comprises a first sub-pixel, a second sub-pixel and a third sub-pixel; an edge of the first sub-pixel close to the third sub-pixel is not parallel to an edge of the first sub-pixel away from the third sub-pixel, and an edge of the second sub-pixel close to the third sub-pixel is not parallel to an edge of the second sub-pixel away from the third sub-pixel;

at least two adjacent first sub-pixels and/or at least two adjacent second sub-pixels of at least two adjacent pixel unit groups are formed by a same mask opening in an evaporation mask; and

wherein the first sub-pixel and the second sub-pixel have a shape of right-angled trapezoid, and the third sub-pixel has a shape of rhombus or hexagon; the right-angled trapezoid has an oblique waist close to the third sub-pixel, and the right-angled trapezoid has a right-angled waist away from the third sub-pixel; and each of the pixel unit groups has a shape of rectangle or square.

2. The pixel structure according to claim 1 , wherein each of the pixel unit groups comprises two first sub-pixels, two second sub-pixels, and one third sub-pixel; each of the pixel unit groups comprises at least two pixel units formed by one first sub-pixel, one second sub-pixel, and one third sub-pixel; and the pixel units in each of the pixel unit groups share the third sub-pixel.

3. The pixel structure according to claim 1 , wherein the first sub-pixel and the second sub-pixel in each of the pixel unit groups are arranged around the third sub-pixel, and the third sub-pixels in the pixel unit groups of adjacent rows are arranged in a staggered manner,

in the pixel unit groups of adjacent rows, orientations of acute angles of the right-angled trapezoids of adjacent first pixels are different, and orientations of acute angles of the right-angled trapezoids of adjacent second pixels are different.

4. The pixel structure according to claim 1 , wherein the first sub-pixel and the second sub-pixel in each of the pixel unit groups are arranged around the third sub-pixel, the third sub-pixels in the pixel unit groups of adjacent rows are arranged in an aligned manner, and two adjacent pixel unit groups in a column and/or row direction are symmetrically distributed with respect to the boundary therebetween,

in the pixel unit groups of adjacent rows, orientations of acute angles of the right-angled trapezoids of adjacent first pixels are same, and orientations of acute angles of the right-angled trapezoids of adjacent second pixels are same.

5. The pixel structure according to claim 1 , wherein the first sub-pixel in each of the pixel unit groups is arranged at one side of the third sub-pixel, the second sub-pixel in each of the pixel unit groups is arranged at the other side of the third sub-pixel, the third sub-pixels in the pixel unit groups of adjacent rows are arranged in an aligned manner, and two adjacent pixel unit groups in a column and/or row direction are symmetrically distributed with respect to the boundary therebetween.

6. The pixel structure according to claim 1 , wherein colors of the first sub-pixel, the second sub-pixel, and the third sub-pixel are selected from red, blue, or green, and colors of the first sub-pixel, the second sub-pixel, and the third sub-pixel are different from each other.

7. A pixel structure, comprising a plurality of pixel unit groups arranged in an array, wherein

each of the pixel unit groups comprises a first sub-pixel, a second sub-pixel and a third sub-pixel; an edge of the first sub-pixel close to the third sub-pixel is not parallel to an edge of the first sub-pixel away from the third sub-pixel, and an edge of the second sub-pixel close to the third sub-pixel is not parallel to an edge of the second sub-pixel away from the third sub-pixel;

at least two adjacent first sub-pixels and/or at least two adjacent second sub-pixels of at least two adjacent pixel unit groups are formed by a same mask opening in an evaporation mask;

wherein the first sub-pixel and the second sub-pixel in each of the pixel unit groups are arranged around the third sub-pixel, and the third sub-pixels in the pixel unit groups of adjacent rows are arranged in a staggered manner.

8. The pixel structure according to claim 7 , wherein the third sub-pixels in the pixel unit groups of adjacent rows are staggered by a distance half of the pixel unit group.

9. A pixel structure, comprising a plurality of pixel unit groups arranged in an array, wherein

each of the pixel unit groups comprises a first sub-pixel, a second sub-pixel and a third sub-pixel; an edge of the first sub-pixel close to the third sub-pixel is not parallel to an edge of the first sub-pixel away from the third sub-pixel, and an edge of the second sub-pixel close to the third sub-pixel is not parallel to an edge of the second sub-pixel away from the third sub-pixel;

at least two adjacent first sub-pixels and/or at least two adjacent second sub-pixels of at least two adjacent pixel unit groups are formed by a same mask opening in an evaporation mask; wherein the first sub-pixel and the second sub-pixel in each of the pixel unit groups are arranged around the third sub-pixel, the third sub-pixels in the pixel unit groups of adjacent rows are arranged in an aligned manner, and two adjacent pixel unit groups in a column and/or row direction are symmetrically distributed with respect to the boundary therebetween.

10. An evaporation mask, wherein the evaporation mask is configured to form a pixel structure, comprising: a plurality of pixel unit groups arranged in an array, wherein each of the pixel unit groups comprises a first sub-pixel, a second sub-pixel and a third sub-pixel; an edge of the first sub-pixel close to the third sub-pixel is not parallel to an edge of the first sub-pixel away from the third sub-pixel, and an edge of the second sub-pixel close to the third sub-pixel is not parallel to an edge of the second sub-pixel away from the third sub-pixel; and at least two adjacent first sub-pixels and/or at least two adjacent second sub-pixels of at least two adjacent pixel unit groups are formed by a same mask opening in an evaporation mask, and the evaporation mask comprises a plurality of mask openings,

wherein the mask opening of the evaporation mask is a polygon formed by combining at least two right-angled trapezoids.

11. The evaporation mask according to claim 10 , wherein the mask opening of the evaporation mask has a shape of a hexagon formed by combining lower bottom edges of two right-angled trapezoids, orientations of acute angles of the two right-angled trapezoids are different, and the mask openings in adjacent rows are arranged in a staggered manner.

12. The evaporation mask according to claim 10 , wherein the mask opening of the evaporation mask has a shape of a pentagon formed by combining lower bottom edges of two right-angled trapezoids, acute angles of the two right-angled trapezoids has a same orientation and form a tip of the mask opening, the orientations of the tips of the mask openings in adjacent rows are different, and the mask openings in adjacent rows are arranged in a staggered manner.

13. The evaporation mask according to claim 10 , wherein the mask opening of the evaporation mask has a shape of an isosceles trapezoid formed by combining two right-angled trapezoids, and the mask openings in adjacent rows are arranged in an aligned manner.

14. The evaporation mask according to claim 10 , wherein the mask opening of the evaporation mask has a shape of a hexagon formed by combining four right-angled trapezoids, and right angles of the four right-angled trapezoids are arranged adjacent to each other.