Does TFT Mobility Impact Pixel Size in AMOLED Backplanes?

Kumar, Aditya; Nathan, Arokia; Jabbour, Ghassan E.

doi:10.1109/ted.2005.857937

Cited by 39 publications

(19 citation statements)

References 13 publications

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“…In previous attempts, organic materials were integrated on activematrix backplanes with a-Si:H thin-film transistors [6][7][8] , creating hybrid organic devices like flexible image sensor arrays 7 . Owing to the large pixel size of a-Si:H-devices, which typically exceeds 100 mm (refs 6-8), they are commercially employed only in largearea applications like X-ray image sensors and (organic) displays, as active-matrix organic light-emitting diodes 14 . For sensing in the visible and NIR range of the spectrum, only two competitive silicon imager technologies for high-pixel resolution are available: complementary metal oxide semiconductors (CMOS) and charge-coupled devices (CCD).…”

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confidence: 99%

A hybrid CMOS-imager with a solution-processable polymer as photoactive layer

et al. 2012

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The solution-processability of organic photodetectors allows a straightforward combination with other materials, including inorganic ones, without increasing cost and process complexity significantly compared with conventional crystalline semiconductors. Although the optoelectronic performance of these organic devices does not outmatch their inorganic counterparts, there are certain applications exploiting the benefit of the solution-processability. Here we demonstrate that the small pixel fill factor of present complementary metal oxide semiconductor-imagers, decreasing the light sensitivity, can be increased up to 100% by replacing silicon photodiodes with an organic photoactive layer deposited with a simple low-cost spray-coating process. By performing a full optoelectronic characterization on this first solution-processable hybrid complementary metal oxide semiconductor-imager, including the first reported observation of different noise types in organic photodiodes, we demonstrate the suitability of this novel device for imaging. Furthermore, by integrating monolithically different organic materials to the chip, we show the cost-effective portability of the hybrid concept to different wavelength regions.

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confidence: 99%

A hybrid CMOS-imager with a solution-processable polymer as photoactive layer

et al. 2012

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“…In recent years, one popular application of a-Si TFT technology is pixel circuits for active matrix liquid crystal display (AMLCD) [11] and active matrix organic light-emitting diode (AMOLED) [7], [12]. As a-Si TFT technology advances, not only pixel circuits but also large-scale analog circuits have been designed, for instance, shift register for gate driver [11], differential amplifier [13], embedded level shifter [14], and operational amplifier [15].…”

Section: A Flexible Tftmentioning

confidence: 99%

Flexible TFT Circuit Analyzer Considering Process Variation, Aging, and Bending Effects

Ma¹,

Wei²,

Li³

et al. 2014

J. Display Technol.

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This paper presents a SPICE-based simulator, FlexiAnalyzer, for flexible thin-film transistor (TFT) circuits. This simulator performs four types of analysis: yield analysis, aging analysis, performance analysis, and weak spot analysis. This simulator considers three important effects: 1) threshold voltage variation of manufacturing process; 2) threshold voltage shift due to aging effect; and 3) mobility change due to bending effect. Six different OLED pixel drivers designed in 8-m amorphous silicon TFT technology were used in simulation results. The proposed tool provides a good solution for designers to evaluate the performance and yield of flexible TFT circuits.Index Terms-Flexible TFT circuits, spice, circuit analyzer, bending effect, aging effect.

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“…2, requires lower gate (source) voltage of the driving TFT M TFT than the source-coupled type pixel. This can reduce degradation of M TFT [6]. However, it is difficult to apply this type of driver to an inverted type pixel, which senses I PIXEL at the drain node of M TFT .…”

Section: Introductionmentioning

confidence: 99%

A Direct Fast Feedback Current Driver Using an Inverting Amplifier for High-Quality AMOLED Displays

Jeon

Son

et al. 2012

IEEE Trans. Circuits Syst. II

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A direct fast feedback current (DFFC) driver is proposed for high-quality AMOLED displays with inverted type pixels. The driver is implemented using an integrator with a loop compensator and an inverting amplifier with a switchedcapacitor gain circuit. Demultiplexing operation is realized to drive two channels using one driver. The measurement result shows settling time of 7 µs for a panel load of 1.5 kΩ/100 pF. The driver is fabricated in a 0.35-µm CMOS process, and the area is 120 × 131 µm 2 per two channels.Index Terms-Active-matrix organic light-emitting diode (AMOLED), column driver, fast feedback current driver, feedback current driver.

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Does TFT Mobility Impact Pixel Size in AMOLED Backplanes?

Cited by 39 publications

References 13 publications

A hybrid CMOS-imager with a solution-processable polymer as photoactive layer

A hybrid CMOS-imager with a solution-processable polymer as photoactive layer

Flexible TFT Circuit Analyzer Considering Process Variation, Aging, and Bending Effects

A Direct Fast Feedback Current Driver Using an Inverting Amplifier for High-Quality AMOLED Displays

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