Display device, head mounted display device, and method for manufacturing head mounted display module

1. A display device comprising:

a display panel having a central part and a peripheral part surrounding the central part, the display panel comprising a plurality of pixels; and

a lens array on the display panel, wherein:

the lens array comprises a first lens on the central part and a second lens on the peripheral part such that the first lens and the second lens are laterally spaced apart from each other in a plan view;

a first focal length of the first lens is smaller than a second focal length of the second lens; and

each of the first lens and the second lens overlaps at least two pixels among the plurality of pixels,

wherein the first lens overlaps two or more pixels and five or less pixels among the plurality of pixels in the plan view.

2. The display device of claim 1 , further comprising a body part accommodating the display panel and the lens array, wherein two opening parts are provided in one region of the body part facing the lens array.

3. The display device of claim 1 , wherein a curvature of the first lens is larger than a curvature of the second lens.

4. The display device of claim 1 , wherein a refractive index of the first lens is equal to a refractive index of the second lens.

5. The display device of claim 1 , wherein a thickness of the first lens is larger than a thickness of the second lens.

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

a first electrode under the first lens and the second lens; and

a second electrode on the first lens and the second lens, wherein each of the first lens and the second lens comprises a reactive compound and liquid crystal molecules.

7. The display device of claim 6 , wherein:

fixed regions, in which orientation directions of the liquid crystal molecules are fixed by the reactive compound, are defined in the lens array;

the fixed regions comprise a first fixed region included in the first lens and a second fixed region included in the second lens; and

an area of the first fixed region and an area of the second fixed region are different from each other.

8. The display device of claim 7 , wherein an area of the first fixed region is smaller than an area of the second fixed region.

9. The display device of claim 6 , wherein a thickness of the first lens is equal to a thickness the second lens.

10. The display device of claim 1 , wherein the first lens overlaps only five pixels among the plurality of pixels in the plan view.

11. The display device of claim 10 , wherein the five pixels comprise a center pixel on a center and four peripheral pixels surrounding the center pixel.

12. The display device of claim 11 , wherein a center of the first lens overlaps the center pixel in the plan view.

13. The display device of claim 11 , wherein the center pixel is a green pixel, two peripheral pixels among the four peripheral pixels are red pixels, and a remaining two peripheral pixels are blue pixels.

14. The display device of claim 11 , wherein the center pixel is a red pixel or a blue pixel, and the four peripheral pixels are green pixels.

15. A head mounted display device comprising:

a display panel having a central part and a peripheral part surrounding the central part, the display panel comprising a plurality of pixels; and

a lens array on the display panel, wherein:

the lens array comprises a first lens on the central part and a second lens on the peripheral part such that the first lens and the second lens are laterally spaced apart from each other in a plan view;

a first focal length of the first lens is smaller than a second focal length of the second lens; and

each of the first lens and the second lens overlaps at least two pixels among the plurality of pixels,

wherein the first lens overlaps two or more pixels and five or less pixels among the plurality of pixels in the plan view.