Fresnel lens and display devices with such fresnel lens

Abstract

Provided is a Fresnel lens and display devices with such Fresnel lens, the Fresnel lens includes an entrance plane and an exit plane with multiple bump units. The bump units include a first bump unit, a second bump unit, and a third bump unit; on one side of the central axis of said lens, the first bump unit, second bump unit and third bump unit are placed successively along the radiation direction from the central axis toward the lens edge, on the other side of the central axis of said lens, the first bump unit, second bump unit and third bump unit are also placed successively along the radiation direction from the central axis toward the lens edge. The bump units on both sides of the central axis of the lens are symmetrical.

1 - 10 . (canceled) 
     
     
         11 . A Fresnel lens comprising an entrance plane and an exit plane with multiple bump units thereon, wherein
 the multiple bump units comprise:
 a first bump unit having multiple first orthogonal sawteeth, wherein the first orthogonal sawteeth have the same tooth-width and their tooth-depth gradually increases in a radial direction from a central axis of the Fresnel lens toward an edge of the Fresnel lens; 
 a second bump unit having multiple second orthogonal sawteeth, wherein the second orthogonal sawteeth have the same tooth-depth and their tooth-width gradually decreases in the radial direction from the central axis toward the lens edge; 
 a third bump unit having multiple second double-sided sawteeth, wherein the second double-sided sawteeth have the same tooth-depth and their tooth-width gradually decreases in the radial direction from the central axis toward the lens edge; 
 on one side of the central axis of the lens, the first bump unit, the second bump unit and the third bump unit are placed successively in the radial direction from the central axis toward the lens edge; on the other side of the central axis of the lens, the first bump unit, the second bump unit and the third bump unit are also placed successively in the radial direction from the central axis toward the lens edge, the bump units on both sides of the central axis of the lens are symmetrical. 
   
     
     
         12 . A Fresnel lens comprising an entrance plane and an exit plane with multiple bump units thereon, wherein.
 the multiple bump units comprise:
 a first bump unit comprising multiple first orthogonal sawteeth, wherein the first orthogonal sawteeth have the same tooth-width and their tooth-depth gradually increases in a radial direction from a central axis of the Fresnel lens toward an edge of the Fresnel lens; 
 a second bump unit comprising multiple first double-sided sawteeth, wherein the first double-sided sawteeth have the same tooth-width and their tooth-depth gradually increases in the radial direction from the central axis toward the lens edge; 
   a third bump unit comprising multiple second double-sided sawteeth, wherein the second double-sided sawteeth have the same tooth-depth and their tooth-width gradually decreases comprising direction from the central axis toward the lens edge;
 on one side of the central axis of the lens, the first bump unit, the second bump unit and the third bump unit are placed successively in the radial direction from the central axis toward the lens edge; on the other side of the central axis of the lens, the first bump unit, the second bump unit and the third bump unit are also placed successively in the radial direction from the central axis toward the lens edge, the bump units on both sides of the lens are symmetrical. 
   
     
     
         13 . A Fresnel lens comprising an entrance plane and an exit plane with multiple bump units thereon, wherein
 the multiple bump units comprise:
 a first bump unit comprising multiple first orthogonal sawteeth, wherein the first orthogonal sawteeth have the same tooth-width and their tooth-depth gradually increases in a radial direction from a central axis of the Fresnel lens toward an edge of the Fresnel lens; 
 a second bump unit comprising multiple second double-sided sawteeth, wherein the second double-sided sawteeth have the same tooth-depth and their tooth-width gradually decreases in the radial direction from the central axis toward the lens edge; 
 on one side of the central axis of the lens, the first bump unit and the second bump unit are placed successively in the radial direction from the central axis toward the lens edge; on the other side of the central axis of the lens, the first bump unit and the second bump unit are also placed successively in the radial direction from the central axis toward the lens edge, the bump units on both sides of the lens are symmetrical. 
   
     
     
         14 . A Fresnel lens comprising an entrance plane and an exit plane with multiple bump units thereon, wherein
 the multiple bump units comprise:
 a first bump unit comprising multiple first orthogonal sawteeth, wherein the first orthogonal sawteeth have the same tooth-width and their tooth-depth gradually increases in a radial direction from central axis of the Fresnel lens toward an edge of the Fresnel lens; 
 a second bump unit comprising multiple second orthogonal sawteeth, wherein the second orthogonal sawteeth have the same tooth-depth and their tooth-width gradually decreases in the radial direction from the central axis toward the lens edge; 
 on one side of the central axis of the lens, the first bump unit and the second bump unit are placed successively in the radial direction from the central axis toward the lens edge; on the other side of the central axis of the lens, the first bump unit and second bump unit are also placed successively in the radial direction from the central axis toward the lens edge, the bump units on both sides of the lens are symmetrical. 
   
     
     
         15 . The Fresnel lens according to  claim 11 , wherein each first orthogonal sawtooth comprises a first right-angle side perpendicular to the entrance plane, a first hypotenuse intersecting with the first right-angle side, and a third included angle formed between the first right-angle side and the first hypotenuse, the third included angle gradually decreases in the radial direction from the central axis toward the lens edge. 
     
     
         16 . The Fresnel lens according to  claim 12 , wherein each first orthogonal sawtooth comprises a first right-angle side perpendicular to the entrance plane, a first hypotenuse intersecting with the first right-angle side, and a third included angle formed between the first right-angle side and the first hypotenuse, the third included angle gradually decreases in the radial direction from the central axis toward the lens edge. 
     
     
         17 . The Fresnel lens according to  claim 13 , wherein each first orthogonal sawtooth comprises a first right-angle side perpendicular to the entrance plane, a first hypotenuse intersecting with the first right-angle side, and a third included angle formed between the first right-angle side and the first hypotenuse, the third included angle gradually decreases in the radial direction from the central axis toward the lens edge. 
     
     
         18 . The Fresnel lens according to  claim 14 , wherein each first orthogonal sawtooth comprises a first right-angle side perpendicular to the entrance plane, a first hypotenuse intersecting with the first right-angle side, and a third included angle formed between the first right-angle side and the first hypotenuse, the third included angle gradually decreases in the radial direction from the central axis toward the lens edge. 
     
     
         19 . The Fresnel lens according to  claim 11 , wherein each second orthogonal sawtooth comprises a second right-angle side perpendicular to the entrance plane, a second hypotenuse intersecting the second right-angle side, and a fourth included angle formed between the second right-angle side and the second hypotenuse, the forth included angle gradually decreases in the radial direction from the central axis toward the lens edge. 
     
     
         20 . The Fresnel lens according to  claim 14 , wherein each second orthogonal sawtooth comprises a second right-angle side perpendicular to the entrance plane, a second hypotenuse intersecting the second right-angle side, and a fourth included angle formed between the second right-angle side and the second hypotenuse, the forth included angle gradually decreases in the radial direction from the central axis toward the lens edge. 
     
     
         21 . The Fresnel lens according to  claim 11 , wherein each second double-sided sawtooth comprises a first oblique side, a second oblique side intersecting with the first oblique side, both oblique sides intersects with the entrance, and a first/second included angle formed by the first/second oblique side and the entrance plane. 
     
     
         22 . The Fresnel lens according to  claim 12 , wherein each second double-sided sawtooth comprises a first oblique side, a second oblique side intersecting with the first oblique side, both oblique sides intersect with the entrance, and a first/second included angle formed by the first/second oblique side and the entrance plane. 
     
     
         23 . The Fresnel lens according to  claim 13 , wherein each second double-sided sawtooth comprises a first oblique side, a second oblique side intersecting with the first oblique side, both oblique sides intersect with the entrance, and a first/second included angle formed by the first/second oblique side and the entrance plane. 
     
     
         24 . The Fresnel lens according to  claim 21 , wherein the first included angle gradually decreases in the radial direction from the central axis toward the lens edge and the second included angle gradually increases in the radial direction from the central axis toward the lens edge. 
     
     
         25 . The Fresnel lens according to  claim 22 , wherein the first included angle gradually decreases in the radial direction from the central axis toward the lens edge and the second included angle gradually increases in the radial direction from the central axis toward the lens edge. 
     
     
         26 . The Fresnel lens according to  claim 23 , wherein the first included angle gradually decreases in the radial direction from the central axis toward the lens edge and the second included angle gradually increases in the radial direction from the central axis toward the lens edge. 
     
     
         27 . The Fresnel lens according to  claim 12 , wherein each first double-sided sawtooth comprises a third oblique side close to the central axis of the lens and a fourth oblique side close to the lens edge, the third oblique side and the fourth oblique side intersect at top of the first double-sided sawtooth; the width of the projection of the third oblique side on the entrance plane gradually increases in the radial direction from the central axis toward the lens edge and the width of the projection of the fourth oblique side on the entrance plane gradually decreases in the radial direction from the central axis toward the lens edge. 
     
     
         28 . A display device compromising the Fresnel lens according to  claim 11 .