4.1: A 20‐inch OLED Display Driven by Super‐Amorphous‐Silicon Technology

Tsujimura, Takatoshi; Kobayashi, Yoshinao; Murayama, Kohji; Tanaka, Atsushi; Morooka, Mitsuo; Fukumoto, Eri; Fujimoto, Hiroki; Sekine, Junichi; Kanoh, Keigo; Takeda, K.; Miwa, Koichi; Asano, Motohiko; Ikeda, Nami; Kohara, Sayuri; Ono, Shimpei; Chung, Chia-Tin; Chen, Ruey-Min; Chung, J Y; Huang, Chen-Wei; Guo, Hong-Ru; Yang, Cheng-Chung; Hsu, Chun-Che; Huang, Hao-Jung; Rieß, W.; Riel, Heike; Karg, Siegfried; Beierlein, Tilman; Gundlach, Dave; Alvarado, S. F.; Rost, Constance; Mueller, Peter; Libsch, F.; Mastro, Michael A.; Polastre, R.; Lien, A.; Sanford, J. L.; Kaufman, R.G.

doi:10.1889/1.1832193

Cited by 72 publications

(45 citation statements)

References 12 publications

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“…Recently, prototypes have been demonstrated based on a-Si, including a 20-in. display by IBM/CMO in 2003 2 and a 40-in. display by Samsung Electronics in 2005 3 ; however, even with these demonstrations, the majority of AMOLED prototypes continue to be made on crystallized Si TFT backplanes (e.g., CMO demonstrated a 25-in.-diagonal AMOLED in 2006 based upon an LTPS backplane 4 ), primarily because of the stability problems associated with a-Si.…”

Section: Introductionmentioning

confidence: 99%

System design for a wide‐color‐gamut TV‐sized AMOLED display

et al. 2008

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Abstract— By using current technology, it is possible to design and fabricate performance‐competitive TV‐sized AMOLED displays. In this paper, the system design considerations are described that lead to the selection of the device architecture (including a stacked white OLED‐emitting unit), the backplane technology [an amorphous Si (a‐Si) backplane with compensation for TFT degradation], and module design (for long life and low cost). The resulting AMOLED displays will meet performance and lifetime requirements, and will be manufacturing cost‐competitive for TV applications. A high‐performance 14‐in. AMOLED display was fabricated by using an in‐line OLED deposition machine to demonstrate some of these approaches. The chosen OLED technologies are scalable to larger glass substrate sizes compatible with existing a‐Si backplane fabs.

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Section: Introductionmentioning

confidence: 99%

System design for a wide‐color‐gamut TV‐sized AMOLED display

et al. 2008

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“…The advantages of LTPS over a-Si are (i) higher TFT mobility, (ii) higher TFT stability, and (iii) availability of p-channel TFTs. 2,4 Although using a-Si for AMOLED applications has been demonstrated 5,6 and complete a-Si AMOLED displays have been realized by industry, 7,8 the commercial production of AMOLED displays requires that weaknesses of a-Si be resolved or effectively compensated. The low field-effect mobility in a-Si may be compensated for by developing high-efficiency OLED's which require low driving currents.…”

Section: Introductionmentioning

confidence: 99%

A novel TFT‐OLED integration for OLED‐independent pixel programming in amorphous‐Si AMOLED pixels

Hekmatshoar¹,

Kattamis²,

Cherenack³

et al. 2008

J Soc Info Display

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Abstract— The direct voltage programming of active‐matrix organic light‐emitting‐diode (AMOLED) pixels with n‐channel amorphous‐Si (a‐Si) TFTs requires a contact between the driving TFT and the OLED cathode. Current processing constraints only permit connecting the driving TFT to the OLED anode. Here, a new “inverted” integration technique which makes the direct programming possible by connecting the driver n‐channel a‐Si TFT to the OLED cathode is demonstrated. As a result, the pixel drive current increases by an order of magnitude for the same data voltages and the pixel data voltage for turn‐on drops by several volts. In addition, the pixel drive current becomes independent of the OLED characteristics so that OLED aging does not affect the pixel current. Furthermore, the new integration technique is modified to allow substrate rotation during OLED evaporation to improve the pixel yield and uniformity. The new integration technique is important for realizing active‐matrix OLED displays with a‐Si technology and conventional bottom‐anode OLEDs.

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“…1 Recently, amorphous-silicon (a-Si) based AMOLEDs were also reported, presenting superior uniformity. 2 However, the reliability of a-Si TFTs is well known to be a much more difficult problem than the uniformity of low-temperature polycrystalline-silicon thin-film transistors (LTPS TFT). Although LTPS-TFT-based AMOLEDs suffer from non-uniformity, some compensation methods and new crystallization methods are considered as promising techniques for mass production.…”

Section: Introductionmentioning

confidence: 99%

An active‐matrix organic light‐emitting‐diode pixel circuit for the compensation of I × R voltage drop in power line

Jung¹,

Lee²,

Ahn³

et al. 2007

J Soc Info Display

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Abstract— A new voltage‐driving active‐matrix organic light‐emitting diode (AMOLED) pixel circuit is proposed to improve the display image‐quality of AMOLED displays. Because OLEDs are current‐driven devices, the I × R voltage drop in the power lines is evitable. Accordingly, the I × R voltage‐drop compensation scheme should be included in the pixel‐driving method when a voltage‐compensation method is used. The proposed pixel was designed for the compensation of an I × R voltage drop in the power lines as well as for the compensation of the threshold‐voltage non‐uniformity of low‐temperature polycrystalline‐silicon thin‐film transistors (LTPS TFTs). In order to verify the compensation ability of the proposed pixel, SPICE simulation was performed and compared with those of other conventional pixels. When the Vss voltage varies from 0 to 1 V, the drain current of the proposed pixel decreased by under 1% while that of conventional Vth compensation methods without Vss compensation decreased by over 60%. 2.2‐in. QCIF+ full‐color AMOLED displays, which employ the proposed pixel, have been also developed. It was verified by comparison of the display image quality with a conventional panel that our proposed panel successfully overcame the voltage‐drop problems in the power lines.

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4.1: A 20‐inch OLED Display Driven by Super‐Amorphous‐Silicon Technology

Cited by 72 publications

References 12 publications

System design for a wide‐color‐gamut TV‐sized AMOLED display

System design for a wide‐color‐gamut TV‐sized AMOLED display

A novel TFT‐OLED integration for OLED‐independent pixel programming in amorphous‐Si AMOLED pixels

An active‐matrix organic light‐emitting‐diode pixel circuit for the compensation of I × R voltage drop in power line

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