A pixel unit includes a first pixel, a second pixel, a third pixel, a fourth pixel and a light-shielding structure. The first pixel has a plurality of first sub-pixels, the second pixel has a plurality of second sub-pixels, the third pixel has a plurality of third pixels, and the fourth pixel has a plurality of fourth sub-pixels. The first sub-pixel has a first electrode extending along a first tilting direction. The second sub-pixel has a second electrode extending along a second tilting direction. The third sub-pixel has a third electrode extending along a third tilting direction. The fourth sub-pixel has a fourth electrode extending along a fourth tilting direction. The first pixel, the second pixel, the third pixel and the fourth pixel surround the light-shielding structure collectively. The first tilting direction, the second tilting direction, the third tilting direction and the fourth tilting direction are different from each other.