Abstract
The fabrication of black pixel define layer (PDL) on the organic light emitting diode (OLED) panel has been developed actively by using negative-tone black photoresist which contain photoinitiator, photosensitizer, binder polymer, multifunctional monomer and black mill base in order to improve the outdoor visibility of OLEDs. Cardo type binder polymer containing bulky and rigid fluorene group has been widely used in the black photoresist formulation. However, the commercial cardo binder polymer has high cost and requires high UV dose for the fine patterning of PDL in the photolithographic process. In this study we designed and synthesized various non-cardo type binder polymers and evaluated the new binder polymers in comparison with the cardo binder polymer for the improved patterning of PDL on the OLED panel.
Highlights
Organic light-emitting diodes (OLEDs) have been widely applied to the small size mobile devices, large organic light emitting diode (OLED) TVs and flexible OLED panels, because of such merits of OLEDs as fast response time, low operating voltage, wide viewing angle as well as light weight and thin-film features [1] [2] [3] [4]
The fabrication of black pixel define layer (PDL) on the organic light emitting diode (OLED) panel has been developed actively by using negative-tone black photoresist which contain photoinitiator, photosensitizer, binder polymer, multifunctional monomer and black mill base in order to improve the outdoor visibility of OLEDs
A typical negative-tone black photoresist consisted of photoinitiator, photosensitizer, binder polymer, multifunctional monomer and black mill base, which makes the color of patterned PDL black to reduce the reflection of ambient light from the OLED panel
Summary
Organic light-emitting diodes (OLEDs) have been widely applied to the small size mobile devices, large OLED TVs and flexible OLED panels, because of such merits of OLEDs as fast response time, low operating voltage, wide viewing angle as well as light weight and thin-film features [1] [2] [3] [4]. One OLED pixel in small size OLEDs is able to emit red (R), green (G), and blue (B) light from separate sub-pixels fabricated by the photolithographic process with a fine pat-
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