REFLECTIVE PLATE, DISPLAY HAVING THE SAME, AND METHOD OF CONTROLLING DISTRIBUTION OF REFLECTED LIGHT

1 . A reflective plate comprising:

a plurality of diffracting grating cells comprising gratings which reflect incident light thereon,

wherein the gratings are arranged at a period, and at least one of the period and a direction of the gratings is adjusted to define a distribution of reflected incident light.

2 . The reflective plate of claim 1 , wherein the plurality of diffracting grating cells define the distribution of the reflected incident light so that a diagonal direction of the distribution is shorter than one of a horizontal direction and a vertical direction of the distribution.

3 . The reflective plate of claim 1 , wherein the plurality of diffracting grating cells define the distribution of the reflected incident light so that the distribution includes one of a square shape, a diamond shape, and a cross shape.

4 . The reflective plate of claim 1 , wherein a ratio of a depth of the gratings to a wavelength of the incident light is in a range of 0.2±0.04.

5 . A display comprising:

a reflective plate comprising:

a plurality of diffracting grating cells comprising gratings which reflect incident light thereon,

wherein the gratings are arranged at a period, and at least one of the period and a direction of the gratings is adjusted to define a distribution of reflected incident light; and

a color unit disposed on the reflective plate, which transmits incident light having a predetermined wavelength.

6 . The display of claim 5 , wherein the plurality of diffracting grating cells define the distribution of the reflected incident light so that a diagonal direction of the distribution is shorter than one of a horizontal direction and a vertical direction of the distribution.

7 . The display of claim 5 , wherein the plurality of diffracting grating cells limit the distribution of the reflected incident light so that the distribution has one of a square shape, a diamond shape, and a cross shape.

8 . The display of claim 5 , wherein a ratio of a depth of the gratings of the plurality of diffracting grating cells to a wavelength of the incident light is in a range of 0.2±0.04.

9 . The display of claim 5 , further comprising:

a transmitting unit disposed adjacent to the reflective plate; and

a backlight unit disposed under the reflective plate and the transmitting unit to supply backlight light to the transmitting unit.

10 . A method of controlling a distribution of reflected light, comprising:

arranging a plurality of diffracting grating cells comprising gratings which reflect incident light, wherein the gratings are arranged at a period; and

adjusting at least one of the period and a direction of the gratings of the plurality of diffracting grating cells define a distribution of the reflected incident light.

11 . The method of claim 10 , wherein the plurality of diffracting grating cells define the distribution so that a diagonal direction of the reflected incident light is shorter than one of a horizontal direction and a vertical direction of the distribution.

12 . The method of claim 10 , wherein the diffracting grating cells define the distribution of the reflected incident light so that the distribution has one of a square shape, a diamond shape, and a cross shape.

13 . The method of claim 10 , wherein a ratio of a depth of the gratings of the plurality of diffracting grating cells to a wavelength of incident light is in a range of 0.2±0.04.

14 . A reflective plate comprising:

a plurality of diffracting grating cells comprising gratings which reflect incident light thereon, the grating having a period and a direction,

wherein a distribution of reflected incident light is based on at least one of the period and the direction of the gratings.