A large size tiled display device includes a plurality of display panels having an image display part including a plurality of pixels. Each pixel includes at least three sub-pixels. A frame has a plurality of panel receiving portions to receive the plurality of display panels. The frame has an outer wall frame and a partition wall frame, each of which has a vertical surface and an inclined surface extending from the vertical surface that tapers the frame. A light guide plate is formed of a cluster of optical fibers. The light guide plate is disposed on the display panels to reproduce an image formed on the image display part of the display panels. Each optical fiber corresponds to one sub-pixel.