Abstract
A pixel define layer (PDL) in an organic light emitting diode (OLED) is patterned using a photolithographic process before the deposition of organic layers on top of ITO anode. If the patterning of PDL on OLED panels can be achieved using a black photoresist, the patterning of black matrix (BM) on top of PDL patterns can be omitted by reducing the reflection of ambient light from OLED panels. In this study, we synthesized a series of side-chain-type polyimides as binder polymers of black photoresists and investigated the potential of using the black photoresist for the fine patterning of black PDL on OLED panels.
Highlights
Organic light emitting diodes (OLEDs) have become one of the major trends in the fabrication of flat panel displays because of their advantages, such as light weight, slim panels, fast response time, wide viewing angle, high resolution, and low power consumption [1,2,3,4]
The light emitting area of an OLED device is disposed at the luminous region of the pixel array on the OLED panel connected to a thin film transistor unit
In the current positive-tone photolithographic process, a black matrix (BM) layer is patterned on top of the pixel define layer (PDL) pattern to improve the visibility of the OLED device (Figure 1)
Summary
Organic light emitting diodes (OLEDs) have become one of the major trends in the fabrication of flat panel displays because of their advantages, such as light weight, slim panels, fast response time, wide viewing angle, high resolution, and low power consumption [1,2,3,4]. Before the deposition of OLED organic layers, a pixel define layer (PDL) is patterned via a photolithographic process, as shown in Figure 1 [5,6,7,8]. Positive-tone photosensitive polyimide [9, 10] is used to fabricate PDL microstructures. The corresponding PDL is yellowish brown similar to that of polyimide films. Since the yellowish-brown polyimide layer of PDL reflects the incident light, the visibility of the OLED display is reduced, when used outdoors. In the current positive-tone photolithographic process, a black matrix (BM) layer is patterned on top of the PDL pattern to improve the visibility of the OLED device (Figure 1)
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