Display panel and display device

1. A display panel comprising a first sub-panel and a second sub-panel arranged opposite to each other,

wherein the first sub-panel comprises a plurality of pixel units, and the second sub-panel comprises a plurality of functional units, each of the functional units corresponds to respective at least one of the pixel units, and an optical lens layer is arranged between the first sub-panel and the second sub-panel, and configured to form a real image of each of the functional units or each of the pixel units between the functional unit and the pixel unit, wherein a size of the real image of the functional unit is equal to a size of the functional unit, and a size of the real image of the pixel unit is equal to a size of the pixel unit,

wherein the optical lens layer comprises a plurality of convex lenses arranged in an array, and optical axes of the convex lenses are arranged perpendicular to a light-emitting surface of the second sub-panel, and

wherein a distance between the functional unit and the respective at least one of the pixel units is 4 times a focal length of the convex lens.

2. The display panel according to claim 1 , wherein each of the convex lenses is a plano-convex lens or lenticular lens.

3. The display panel according to claim 1 , wherein each of the convex lenses corresponds to respective at least one of the functional units.

4. The display panel according to claim 1 , wherein the size of each of the pixel units is same as a size of each of the convex lenses, and a curvature radius r of each of the convex lenses satisfies a formula: r=d/4(n−1)>p/2, wherein d represents a distance between the pixel unit and the functional unit, n represents a refractive index of the convex lens, and p represents the size of each of the pixel units.

5. The display panel according to claim 1 , wherein a

s

=

r

-

r

2

-

p

2

4

,

thickness s of each of the convex lenses satisfies a formula: wherein r represents a curvature radius of each of the convex lenses, and p represents the size of each of the pixel units.

6. The display panel according to claim 1 , wherein the second sub-panel is a light-controlled panel, and the functional unit is a light-controlled unit.

7. The display panel according to claim 6 , wherein the light-controlled unit comprises a part of a substrate of the light-controlled panel and a black matrix arranged on the part of the substrate of the light-controlled panel.

8. The display panel according to claim 6 , wherein the optical lens layer is configured to form a real image of the light-controlled unit between the light-controlled unit and the pixel unit, a size of the real image of the light-controlled unit is equal to a size of the light-controlled unit, and a distance between the real image of the light-controlled unit and the respective pixel unit is less than a distance between the real image of the light-controlled unit and the light-controlled unit.

9. The display panel according to claim 1 , wherein the second sub-panel is a touch panel, and the functional unit is a touch sensing unit.

10. The display panel according to claim 9 , wherein the touch sensing unit comprises at least one touch electrode.

11. The display panel according to claim 9 , wherein the touch sensing unit is made of Indium Tin Oxide (ITO).

12. The display panel according to claim 9 , wherein the optical lens layer is configured to form the real image of the pixel unit between the touch sensing unit and the pixel unit, the size of the real image of the pixel unit is equal to the size of the pixel unit, and a distance between the real image of the pixel unit and the respective touch sensing unit is less than a distance between the real image of the pixel unit and the pixel unit.

13. The display panel according to claim 1 , wherein an orthographic projection of the functional unit onto the optical lens layer completely coincides with a respective convex lens.

14. A display device comprising the display panel according to claim 1 .

15. The display device according to claim 14 , wherein each of the convex lenses is a plano-convex lens or lenticular lens.

16. The display device according to claim 14 , wherein each of the convex lenses corresponds to respective at least one of the functional units.