Patent ID: 8901936

Claim:
A device for testing an array of an organic light emitting diode display, the device comprising: an electron beam irradiator that irradiates first electron beams to a capacitor of a selected pixel from a pixel array, which pixel array includes a plurality of pixels that each include an anode, a driving transistor that transmits a driving current that corresponds to a data signal of an organic light emitting diode according to a scan signal, and at least one capacitor, and that irradiates second electron beams to respective anodes of the plurality of pixels; a signal analyzer that detects a first output amount of secondary electrons that are output corresponding to the irradiation of the first electron beams, that detects a second output amount of secondary electrons that are output corresponding to the irradiation of the second electron beams, and that calculates a first detected voltage that corresponds to the first output amount and a second detected voltage that corresponds to the second output amount; a controller that sets a charging voltage charged into the capacitor, that sets an irradiation amount of the first electron beams, and an irradiation amount of the second electron beams, that compares the first detected voltage and the charging voltage, and that determines an operational state of the pixel array based on the second detected voltage; and a calibrator that performs a calibration process when the first detected voltage and the charging voltage are determined to digress from a predetermined threshold range and are in a non-corresponding relationship with respect to each other.