A color filter comprising: a dielectric layer and a wire grid structure array disposed on the dielectric layer, wherein the dielectric layer comprises a first reflective-rate modulation layer, a second reflective-rate modulation layer on the first reflective-rate modulation layer, and a third reflective-rate modulation layer between the second reflective-rate modulation layer and the wire grid structure array; wherein a reflective-rate of the first reflective-rate modulation layer is less than a reflective-rate of the second reflective-rate modulation layer; wherein a reflective-rate of the third reflective-rate modulation layer is less than a reflective-rate of the second reflective-rate modulation layer; wherein the first reflective-rate modulation layer and the third reflective-rate modulation layer are made of SiO 2,SiO, and MgO; wherein the second reflective-rate modulation layer is made of Si 3 N 4, TiO 2, and Ta 2 O 5 and the second reflective-rate modulation layer is placed between the first reflective-rate modulation layer and the third reflective-rate modulation layer; wherein the wire grid structure array comprises a plurality of wire grid structures, each of the wire grid structures comprises a first wire grid unit, a second wire grid unit, a third wire grid unit, and a fourth wire grid unit; wherein the first wire grid unit comprises first wire grids spaced apart from each other by a first grid-space, and the first wire grids are parallel to each other; wherein the second wire grid unit comprises second wire grids spaced apart from each other by a second grid-space, and the second wire grids are parallel to each other; wherein the third wire grid unit comprises third wire grids spaced apart from each other by a third grid-space, and the third wire grids are parallel to each other; wherein the fourth wire grid unit comprises fourth wire grids spaced apart from each other by a fourth grid-space, and the fourth wire grids are parallel to each other; wherein the first grid-space between the first wire grids is greater than the second grid-space between the second wire grids; wherein the second grid-space between the second wire grids is greater than the third grid-space between the third wire grids; wherein the third grid-space between the third wire grids is greater than the fourth grid-space between the fourth wire grids; and wherein the first wire grid unit, the second wire grid unit, the third wire grid unit, and the fourth wire grid unit are configured to respectively filter incident light beams to obtain light beams of four different colors. a dielectric layer and a wire grid structure array disposed on the dielectric layer, wherein the dielectric layer comprises a first reflective-rate modulation layer, a second reflective-rate modulation layer on the first reflective-rate modulation layer, and a third reflective-rate modulation layer between the second reflective-rate modulation layer and the wire grid structure array; wherein a reflective-rate of the first reflective-rate modulation layer is less than a reflective-rate of the second reflective-rate modulation layer; wherein a reflective-rate of the third reflective-rate modulation layer is less than a reflective-rate of the second reflective-rate modulation layer; wherein the first reflective-rate modulation layer and the third reflective-rate modulation layer are made of SiO 2,SiO, and MgO; wherein the second reflective-rate modulation layer is made of Si 3 N 4, TiO 2, and Ta 2 O 5 and the second reflective-rate modulation layer is placed between the first reflective-rate modulation layer and the third reflective-rate modulation layer; wherein the wire grid structure array comprises a plurality of wire grid structures, each of the wire grid structures comprises a first wire grid unit, a second wire grid unit, a third wire grid unit, and a fourth wire grid unit; wherein the first wire grid unit comprises first wire grids spaced apart from each other by a first grid-space, and the first wire grids are parallel to each other; wherein the second wire grid unit comprises second wire grids spaced apart from each other by a second grid-space, and the second wire grids are parallel to each other; wherein the third wire grid unit comprises third wire grids spaced apart from each other by a third grid-space, and the third wire grids are parallel to each other; wherein the fourth wire grid unit comprises fourth wire grids spaced apart from each other by a fourth grid-space, and the fourth wire grids are parallel to each other; wherein the first grid-space between the first wire grids is greater than the second grid-space between the second wire grids; wherein the second grid-space between the second wire grids is greater than the third grid-space between the third wire grids; wherein the third grid-space between the third wire grids is greater than the fourth grid-space between the fourth wire grids; and wherein the first wire grid unit, the second wire grid unit, the third wire grid unit, and the fourth wire grid unit are configured to respectively filter incident light beams to obtain light beams of four different colors.