A method of testing and manufacturing a plurality of light emitting display devices comprising: providing a mother substrate comprising: the plurality of light emitting display devices; a first wire group extending in a first direction on a border region of the light emitting display devices; and a second wire group extending in a second direction in the border region of the light emitting display devices, wherein each of the light emitting display devices includes: a plurality of pixels; a plurality of scan lines for selectively applying a scan signal to the pixels; a plurality of data lines crossing the scan line and applying a data signal to the pixels; a scan driver for applying a scan signal to the scan lines; and a first testing unit connected between the scan driver and a predetermined wire included in the first or second wire group (500, 600), wherein the scan driver is arranged to generate a scan signal corresponding to a control signal supplied from the first testing unit, and power sources and signals supplied via the first or second wire group (500, 600); a second testing/measuring unit connected between any one of a plurality of the scan lines and a predetermined wire included in the first or second wire group (500, 600), wherein the first testing unit is arranged on the mother substrate between a first scribing line and a second grinding line of the light emitting display devices; wherein the method comprises: using the first testing units to independently control predetermined signals applied to the scan drivers of the plurality of light emitting display devices to carry out testing of the light emitting display devices; using respective first testing units to turn off the erroneously operated light emitting display devices when the tests of the light emitting display devices on the mother substrate are carried out; scribing the mother substrate along the first scribing lines to separate the light emitting display devices such that, for each device, the first testing unit and the predetermined wire become electrically disconnected from each other; and performing a grinding process along the second grinding lines, such that, for each device, the first testing unit and the light emitting display device become electrically disconnected from each other. providing a mother substrate comprising: the plurality of light emitting display devices; a first wire group extending in a first direction on a border region of the light emitting display devices; and a second wire group extending in a second direction in the border region of the light emitting display devices, the plurality of light emitting display devices; a first wire group extending in a first direction on a border region of the light emitting display devices; and a second wire group extending in a second direction in the border region of the light emitting display devices, a plurality of pixels; a plurality of scan lines for selectively applying a scan signal to the pixels; a plurality of data lines crossing the scan line and applying a data signal to the pixels; a scan driver for applying a scan signal to the scan lines; and a first testing unit connected between the scan driver and a predetermined wire included in the first or second wire group (500, 600), using the first testing units to independently control predetermined signals applied to the scan drivers of the plurality of light emitting display devices to carry out testing of the light emitting display devices; using respective first testing units to turn off the erroneously operated light emitting display devices when the tests of the light emitting display devices on the mother substrate are carried out; scribing the mother substrate along the first scribing lines to separate the light emitting display devices such that, for each device, the first testing unit and the predetermined wire become electrically disconnected from each other; and performing a grinding process along the second grinding lines, such that, for each device, the first testing unit and the light emitting display device become electrically disconnected from each other.