Organic light emitting diode display device

An organic light emitting display device (OLED) has a substrate 301 and pixel regions P1 each having an electrode 320. Pixel regions P1 in a column emit the same colour (figure 7) and neighbouring pixel regions P1 in a column define a pixel group PG. A bank 350 surrounds each pixel group PG. An organic light emitting layer 370 is on electrodes 320 of each pixel group PG, and may be laminated using a soluble process such as inkjet or nozzle printing, and may have thickness uniformity. The bank 350 may have equal width between pixel regions in a row which emit different colours. The OLED may also have an auxiliary electrode connected to a power line, which may reduce the sheet resistance and width of the power line, reducing aperture ratio. An insulation pattern 340 may be provided between pixel regions P1 of each pixel group PG.