Patent ID: 6682863
Filing Date: 2004-01-27
Classification: H01L

Abstract:
A method for depositing an emissive layer for use in an organic light-emitting display device (OLED), comprising the steps of:(a) providing an OLED substrate having at least two discernible fiducial marks which is usable for locating the position and orientation of the OLED substrate for properly depositing the emissive layer relative to pixel portions of the OLED substrate; (b) providing a light source that provides a beam of light which is transversely and angularly movable to selected positions to change the relative location of a beam of light produced by such source; (c) providing an unpatterned donor element including emissive material and having an energy-absorbing layer, arranged so that when the donor element is properly positioned relative to the OLED substrate, the beam of light can be absorbed by the energy-absorbing layer to heat the emissive material and cause the transfer of such emissive material to the OLED substrate; (d) positioning the donor element in a transfer relationship to the OLED substrate; (e) detecting the location of the discernible feature on the OLED substrate to determine the position and orientation of the OLED substrate relative to the light source; and (f) angularly moving the beam of light and then moving the beam of light in a first transverse direction until a first end point is reached and then moving the beam of light in a perpendicular direction and again transversely moving the beam of light in a second direction parallel to but opposite to the first direction to a second end point and actuating the transversely moving beam of light in the first or second directions or both directions in accordance with the detected position and orientation of the OLED substrate by changing the timing of such actuation as the beam of light is moved to different transverse positions.