Apparatus for compensating viewing angle of display device and method thereof

1 . A method for compensating a viewing angle of a display device, comprising:

setting a luminance for each pixel of a display panel to a target luminance, wherein the target luminance includes a low gray level target luminance having a low gray level range and a high gray level target luminance having a high gray level range in the each pixel;

referring to a lookup table including the low gray level target luminance and the high level target luminance which respectively corresponds entire gray level values of an input image data input to the display panel;

calculating a compensation value which corresponds to at least one of the low gray level target luminance and the high level target luminance corresponding to the input image data for the each pixel of the display panel referring to the lookup table; and

compensating the viewing angle corresponding to the each pixel of the display panel referring to the compensation value for the input image data,

wherein the lookup table includes:

a first lookup table generated by matching an entire grayscale value of input image data input to the display panel to the low gray level target luminance; and

a second lookup table generated by matching the entire grayscale value of the input image data to the high grayscale target luminance.

2 . The method according to claim 1 , wherein the compensation value is obtained using a first luminance difference value between the luminance of the input image data and the low gray level target luminance, or a second luminance difference value between the luminance of the input image data and the high gray level target luminance for the each pixel of the display panel.

3 . The method according to claim 2 , wherein the compensation value is obtained using a third luminance difference value and a fourth luminance difference value by applying a gain to the first luminance difference value and the second luminance difference value.

4 . The method according to claim 1 , between the setting the target luminance and the referring to the lookup table, further comprising: applying a weight to the target luminance, the low gray level target luminance, and the high gray level target luminance for the each pixel of the display panel, thereby changing at least one of a difference between the target luminance and the low gray level target luminance and the difference between the target luminance and the high gray level target luminance at a same gray level according to a position of the each pixel of the display panel,

wherein the lookup table includes the target luminance, the low-gray target luminance, and the high-gray target luminance to which the weight is respectively applied.

5 . The method according to claim 4 , between the setting the target luminance and the referring to the lookup table, further comprising: calculating a maximum value of the low gray level target luminance based on the target luminance and the low gray level target luminance for the each pixel of the display panel.

6 . The method according to claim 5 , wherein the maximum value of the low gray level target luminance is the largest value in the first lookup table.

7 . The method according to claim 5 , between the calculating the maximum value of the low gray level target luminance and the generating the lookup table, further comprising: applying a roll-off algorithm to the maximum value of the low gray level target luminance for the each pixel of the display panel.

8 . The method according to claim 5 , between the calculating the maximum value of the low gray level target luminance and the generating the lookup table, further comprising calculating a high gray level target luminance using the low gray level target luminance for the each pixel of the display panel.

9 . The method according to claim 6 , between the calculating the maximum value of the high gray level target luminance and the generating the lookup table, further comprising calculating an inverse function value using the low gray level target luminance and the high gray level target luminance for the each pixel of the display panel.

10 . The method according to claim 9 , further comprising calculating a first index/second index using the inverse function of the low gray level target luminance and the high gray level target luminance after the calculating the inverse function value.

11 . An apparatus for compensating a viewing angle of a display device, comprising:

a first processer configured to calculate target information by applying a weight to target luminance for each pixel of a display panel and generate at least one lookup table based on the target information; and

a second processor configured to calculate, for each pixel of the display panel, a target luminance value corresponding to an input image data input to the display panel by referring to the at least one lookup table, calculate a first luminance difference value between the luminance of the input image data and the target luminance, and supply a second luminance difference value calculated by applying a gain to the luminance difference value to each pixel of the display panel,

wherein the target luminance includes a low gray level target luminance having a low gray level range and a high gray level target luminance having a high gray level range in the each pixel, and

wherein the at least lookup table includes:

a first lookup table generated by matching an entire grayscale value of input image data input to the display panel to the low gray level target luminance; and

a second lookup table generated by matching the entire grayscale value of the input image data to the high grayscale target luminance.

12 . The apparatus according to claim 11 , wherein the target luminance includes a low gray level target luminance having a low gray level range and a high gray level target luminance having a high gray level range in the each pixel, and

the first processer calculates a maximum value of the low gray level target luminance based on the target luminance and the low gray level target luminance for the each pixel of the display panel.

13 . The apparatus according to claim 11 , wherein the target luminance includes a low gray level target luminance having a low gray level range and a high gray level target luminance having a high gray level range in the each pixel, and

the first processer applies a weight to the target luminance, the low gray level target luminance, and the high gray level target luminance for the each pixel of the display panel, thereby changing at least one of a difference between the target luminance and the low gray level target luminance and the difference between the target luminance and the high gray level target luminance at a same gray level according to a position of the each pixel of the display panel.

14 . The apparatus according to claim 12 , wherein the maximum value of the low gray level target luminance is the largest value in the first lookup table.

15 . The apparatus according to claim 12 , wherein the first processer applies a roll-off algorithm to the maximum value of the low gray level target luminance for the each pixel of the display panel.

16 . The apparatus according to claim 11 , wherein the first processer calculates a high gray level target luminance using the low gray level target luminance for the each pixel of the display panel.

17 . The apparatus according to claim 16 , wherein the first processer calculates an inverse function value using the low gray level target luminance and the high gray level target luminance for the each pixel of the display panel.

18 . The apparatus according to claim 17 , wherein the second processer calculates a first index/second index using the inverse function of the low gray level target luminance and the high gray level target luminance.