Mask and evaporation device

1. A mask, comprising a frame and a first mask strip and a second mask strip which are disposed inside the frame, wherein

the frame includes a bottom surface, and includes an outer frame and an inner frame which is within an enclosed region defined by the outer frame, and the outer frame and the inner frame are both in a rectangular shape defining a length direction and a width direction perpendicular to the length direction; the outer frame includes a first surface in a first plane which is opposite to the bottom surface; the inner frame includes a second surface in a second plane which is parallel to the bottom surface and opposite to the bottom surface; the first plane is higher than the second plane so as to form a step relative to the bottom surface in a third direction perpendicular to the bottom surface;

the first mask strip and the second mask strip each comprises two ends and a main body between the two ends, the first mask strip is fixed to the outer frame through the two ends of the first mask strip, and the main body of the first mask strip is extended along the length direction; and the second mask strip is fixed to the outer frame through the two ends of the second mask strip, and the main body of the second mask strip is extended along the width direction;

a first gap is formed between the main body of the first mask strip and an inner edge in the length direction of the outer frame, and at least a first portion of the second surface of the inner frame is exposed through the first gap;

a second gap is formed between the main body of the second mask strip and an inner edge in the width direction of the outer frame, and at least a second portion of the second surface of the inner frame is exposed through the second gap;

the first mask strip is spaced apart from the second surface of the inner frame in the third direction, and an orthographic projection of the first mask strip onto the second plane in the third direction partially overlaps with the second surface of the inner frame; and

the second mask strip is spaced apart from the second surface of the inner frame in the third direction, and an orthographic projection of the second mask strip onto the second plane in the third direction partially overlaps with the second surface of the inner frame.

2. The mask according to claim 1 , wherein a height difference between the first plane and the second plane is 1 mm 10 mm.

3. The mask according to claim 2 , wherein the height difference between the first plane and the second plane is 5 mm.

4. The mask according to claim 1 , wherein the inner edge in the length direction of the outer frame and the first mask strip are parallel such that the first gap has a uniform width of 0.5 mm-2 mm.

5. The mask according to claim 1 , wherein there is an overlapped area between the second mask strip and the first mask strip.

6. The mask according to claim 5 , wherein the second mask strip is intersected with a middle part of the first mask strip so as to divide the enclosed region defined by the outer frame into a plurality of sub-areas.

7. The mask according to claim 6 , wherein the first mask strip and the second mask strip have an equal thickness.

8. The mask according to claim 6 , wherein both a thickness of the first mask strip and a thickness of the second mask strip are 50 μm-100 μm.

9. The mask according to claim 5 , wherein the first mask strip and the second mask strip have an equal thickness.

10. The mask according to claim 5 , wherein both a thickness of the first mask strip and a thickness of the second mask strip are 50 μm-100 μm.

11. The mask according to claim 1 , wherein both a thickness of the first mask strip and a thickness of the second mask strip are 50 μm-100 μm.

12. An evaporation device, comprising the mask according to claim 1 .

13. The evaporation device according to claim 12 , further comprising a magnet arranged opposite to the mask,

wherein the first mask strip has a magnetic property and is capable of being attracted by the magnet to move.