A tiled display having a light-emissive image area, comprising: a. a plurality of display tiles aligned so that they provide the light-emissive image area; each display tile including: i. a plurality of light-emitting pixels arranged in groups of pixels in the light-emissive image area; ii. a plurality of sequentially arranged pixel drive circuits and each pixel drive circuit being electrically connected to a particular group of pixels for controlling the light emission of such pixels; and iii. each pixel drive circuit being configured to: - receive, via one or more parallel signal communication lines, a portion of data from a separate data source so as to control the light emission of its corresponding group of pixels, - provide, via one or more second in-series communication lines, information to the next sequential pixel drive circuit to cause such next sequential pixel drive circuit to respond to its corresponding data to control the operation of its group of light-emitting pixels, and - repeat this operation until a predetermined number of pixel drive circuits have caused the desired light emission from the emissive area; and b. the data source, said data source being separate from the display tiles and being configured to receive image information and to produce the data, the data source including said parallel signal communication lines, configured to provide the data for controlling the operation of each pixel drive circuit and one or more first in-series signal communication lines per display tile, so as to provide information to the first one of the sequentially arranged pixel drive circuits; wherein: each display tile includes first edges which are parallel to each other and a second edge perpendicular to the first edges, the sequence of pixel drive circuits of each display tile is aligned along the first parallel edges, the one or more parallel signal communication lines and the one or more first in-series communication lines are connected through the second edge to the data source, and each display tile includes its own substrate. a. a plurality of display tiles aligned so that they provide the light-emissive image area; each display tile including: i. a plurality of light-emitting pixels arranged in groups of pixels in the light-emissive image area; ii. a plurality of sequentially arranged pixel drive circuits and each pixel drive circuit being electrically connected to a particular group of pixels for controlling the light emission of such pixels; and iii. each pixel drive circuit being configured to: - receive, via one or more parallel signal communication lines, a portion of data from a separate data source so as to control the light emission of its corresponding group of pixels, - provide, via one or more second in-series communication lines, information to the next sequential pixel drive circuit to cause such next sequential pixel drive circuit to respond to its corresponding data to control the operation of its group of light-emitting pixels, and - repeat this operation until a predetermined number of pixel drive circuits have caused the desired light emission from the emissive area; and i. a plurality of light-emitting pixels arranged in groups of pixels in the light-emissive image area; ii. a plurality of sequentially arranged pixel drive circuits and each pixel drive circuit being electrically connected to a particular group of pixels for controlling the light emission of such pixels; and iii. each pixel drive circuit being configured to: - receive, via one or more parallel signal communication lines, a portion of data from a separate data source so as to control the light emission of its corresponding group of pixels, - provide, via one or more second in-series communication lines, information to the next sequential pixel drive circuit to cause such next sequential pixel drive circuit to respond to its corresponding data to control the operation of its group of light-emitting pixels, and - repeat this operation until a predetermined number of pixel drive circuits have caused the desired light emission from the emissive area; and - receive, via one or more parallel signal communication lines, a portion of data from a separate data source so as to control the light emission of its corresponding group of pixels, - provide, via one or more second in-series communication lines, information to the next sequential pixel drive circuit to cause such next sequential pixel drive circuit to respond to its corresponding data to control the operation of its group of light-emitting pixels, and - repeat this operation until a predetermined number of pixel drive circuits have caused the desired light emission from the emissive area; and b. the data source, said data source being separate from the display tiles and being configured to receive image information and to produce the data, the data source including said parallel signal communication lines, configured to provide the data for controlling the operation of each pixel drive circuit and one or more first in-series signal communication lines per display tile, so as to provide information to the first one of the sequentially arranged pixel drive circuits; each display tile includes first edges which are parallel to each other and a second edge perpendicular to the first edges, the sequence of pixel drive circuits of each display tile is aligned along the first parallel edges, the one or more parallel signal communication lines and the one or more first in-series communication lines are connected through the second edge to the data source, and each display tile includes its own substrate.