Tfel edge emitter structure with uniform light emission filter

Details Tfel edge emitter structure with uniform light emission filter Tfel edge emitter structure with uniform light emission filter

H - Electricity

05

B

345/29

H05B 33/02 (2006.01) H04N 1/028 (2006.01) H05B 33/12 (2006.01) H05B 33/22 (2006.01)

Patent

CA 2038541

W.E. 55,471 ABSTRACT OF THE DISCLOSURE A TFEL edge emitter structure with an EL stack having a linear array of spaced-apart pixels with front edge faces emitting light of non-uniform intensity from different regions has an uniform light emission filter provided across the light-emitting faces of the pixels. The filter takes the form of an exposed photographic emulsion coated directly to the light-emitting faces of the pixels. Alternatively, the filter takes the form of a separate substrate containing the exposed photographic emulsion mounted across the light-emitting faces of the pixels. The exposed emulsion is darker at regions thereof which correspond to regions of the light-emitting edge faces of the pixels with higher original light intensity and lighter at regions thereof which correspond to regions of the light-emitting edge faces of the pixels with lower original light intensity. The final exposed emulsion reduces the original non-uniform intensity of the light from the different regions of the pixel light-emitting faces to an uniform level equal to that of the lowest original light intensity of the pixel light-emitting faces. A focussing lens can be combined with the edge emitter structure. The filter emulsion is exposed so as to compensate not only for non-uniformity of light intensity of the structure but also for optical non- uniformities of the lens.

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