A display device, comprising: a first tile substrate and a second tile substrate separated from the first tile substrate by a seam, wherein the first tile substrate has a first edge (101e or 121e), the second tile substrate has a second edge (103e or 123e), the first edge is adjacent to the second edge and separated from the second edge by the seam, wherein the first tile substrate comprises a plurality of first pixels and a plurality of second pixels (1132',1132"), and the plurality of first pixels are directly adjacent to the first edge (101e or 121e), wherein the second tile substrate comprises a plurality of third pixels and a plurality of fourth pixels, and the plurality of third pixels are directly adjacent to the second edge (103e or 123e); each pixel in the plurality of first pixels, the plurality of second pixels, the plurality of third pixels and the plurality of fourth pixels comprises a plurality of light emitting units being arranged to emit light of different colors; wherein a distance between any two adjacent ones of the plurality of light emitting units of one of the plurality of first pixels is defined as a first distance, a distance between any two adjacent ones of the plurality of light emitting units of one of the plurality of second pixels is defined as a second distance, a distance between any two adjacent ones of the plurality of light emitting units of one of the plurality of third pixels is defined as a third distance, a distance between any two adjacent ones of the plurality of light emitting units of one of the plurality of fourth pixels is defined as a fourth distance, wherein the first distance is less than the second distance, and the third distance is less than the fourth distance so that a ratio of a first pixel pitch to a second pixel pitch is in a range from 0.9 to 1.5, wherein the first pixel pitch is defined as a distance separating same-color light-emitting units in one of the plurality of first pixels and one of the plurality of third pixels adjacent to the one of the plurality of first pixels, and the second pixel pitch is defined as a distance separating same-color light-emitting units in any two adjacent ones of the plurality of second pixels. a first tile substrate and a second tile substrate separated from the first tile substrate by a seam, wherein the first tile substrate has a first edge (101e or 121e), the second tile substrate has a second edge (103e or 123e), the first edge is adjacent to the second edge and separated from the second edge by the seam, wherein the first tile substrate comprises a plurality of first pixels and a plurality of second pixels (1132',1132"), and the plurality of first pixels are directly adjacent to the first edge (101e or 121e), wherein the second tile substrate comprises a plurality of third pixels and a plurality of fourth pixels, and the plurality of third pixels are directly adjacent to the second edge (103e or 123e); each pixel in the plurality of first pixels, the plurality of second pixels, the plurality of third pixels and the plurality of fourth pixels comprises a plurality of light emitting units being arranged to emit light of different colors; wherein a distance between any two adjacent ones of the plurality of light emitting units of one of the plurality of first pixels is defined as a first distance, a distance between any two adjacent ones of the plurality of light emitting units of one of the plurality of second pixels is defined as a second distance, a distance between any two adjacent ones of the plurality of light emitting units of one of the plurality of third pixels is defined as a third distance, a distance between any two adjacent ones of the plurality of light emitting units of one of the plurality of fourth pixels is defined as a fourth distance, wherein the first distance is less than the second distance, and the third distance is less than the fourth distance so that a ratio of a first pixel pitch to a second pixel pitch is in a range from 0.9 to 1.5, wherein the first pixel pitch is defined as a distance separating same-color light-emitting units in one of the plurality of first pixels and one of the plurality of third pixels adjacent to the one of the plurality of first pixels, and the second pixel pitch is defined as a distance separating same-color light-emitting units in any two adjacent ones of the plurality of second pixels.