Loading...
Please wait, while we are loading the content...
Similar Documents
Interlayer Processing for Active Matrix Organic Light Emitting Diode (OLED) Displays
| Content Provider | Semantic Scholar |
|---|---|
| Author | Vicca, Peter Steudel, Soeren Smout, Steve Myny, Kris Genoe, Jan Gelinck, Gerwin H. Heremans, Paul |
| Copyright Year | 2011 |
| Abstract | At the moment, the display market is dominated by liquid crystal displays with amorphous silicon (a-Si) thin film transistor (TFT) backplanes processed on glass. Within the last two years, active matrix OLED (AMOLED) displays have rapidly expanded their market share and are poised to break out of their niche application status. The brightness of OLEDs is current controlled and therefore the driving engine behind every pixel is in its most simple implementation comprising 2 transistors and 1 capacitor (2T1C) as in Figure 1. The required current drive for the necessary brightness (> 500 cd/m2 for cell phone display at > 72 dpi) is however quite challenging for standard a-Si TFTs due to their relatively low mobility (~1 cm2/Vs). The simplest implementation of a pixel engine for AMOLED current steering is depicted in Figure 1. As a result, each pixel in the display contains 2 transistors and 1 capacitor. Since OLEDs requires current driving, transistor 2 (T2) is used as a current source, whereby the gate-source voltage determines the current level through the OLED. This gate-source voltage is stored on capacitor C and can be modified by selecting transistor 1 (T1) via the row select line. The voltage on the dataline is then transferred to the capacitor. It is envisioned that the next generation of displays for handheld device will be flexible or even rollable AMOLED displays realized on foils. The substrate material for backplanes is typically glass, but could be replaced by a flexible substrate, provided that low temperature materials are employed to create the backplane. A working process for OTFTs in a backplane has been shown by Gelinck et al. Truly rollable displays using organic TFTs have been shown recently either using e-ink by Huitema et al (PolymerVision) or using OLEDs by Kawashima et al, Katsuhara et al and by Yagi et al, with the organic TFTs possessing a similar performance to those of a-Si. In order to achieve a sufficient light output, the preferred process flow implements top emitting OLEDs on top of the driving engine resulting in an aspect ratio >70%. The choice of the flexible substrate therefore will determine the process flow in a substantial way. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://cdn.intechopen.com/pdfs/16965/InTech-Interlayer_processing_in_active_matrix_oled_displays.pdf |
| Alternate Webpage(s) | https://api.intechopen.com/chapter/pdf-download/16965 |
| Alternate Webpage(s) | http://cdn.intechopen.com/pdfs-wm/16965.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
