64.2: Full Color 100 dpi AMOLED Displays on Flexible Stainless Steel Substrates

Chwang, Anna B.; Hewitt, Richard; Urbanik, Ken; Silvernail, Jeff; Rajan, Kamala; Hack, Mike; Brown, Julie J.; Lu, Jeng Ping; Shih, Chuan Feng; Ho, J.; Street, R. A.; Ramos, Teresa; Moro, L.; Rutherford, Nicole M.; Tognoni, Keith; Anderson, Bob; Huffman, Dave

doi:10.1889/1.2433406

Cited by 31 publications

(20 citation statements)

References 16 publications

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“…1. [3][4][5] The OLED structure can either be made in direct electrical contact with the metal foil or with an insulating planarization layer in between the device and the substrate. 6 When the OLED structure makes direct contact to the metal foil it has the advantage that the foil can act as a support electrode for the anode so that no additional conductive layers are needed on this side.…”

Section: Top-emissive Oleds On Metal Foilmentioning

confidence: 99%

Optimization of the efficacy and angle dependence of emission of top-emissive organic light-emitting diodes on metal foils

et al. 2011

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Abstract. We have investigated how to optimize the efficacy and angle dependence of emission of top-emissive organic light-emitting diodes (OLEDs) based on metal foil substrates with the aim of creating efficient flexible devices for lighting and signage applications. By systematically varying the device architecture we were able to tune the optical microcavity which exists within the device structure and observe the change in performance. We paid particular attention to the effects of the metal foil roughness. We have seen that by changing the layer thickness of the poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) [PEDOT:PSS] in the device, and the substrate reflectivity and roughness we can obtain efficacies not too far from those achieved for standard bottom-emissive devices on glass substrates made with the same emitter. The angle dependence of luminance can be tuned from pointing in the forward direction via Lambertian to having a maximum at around 65• , and we have used optical modeling to help us find the optimum device structure. We conclude that (rough) metal foils are a realistic possibility for making flexible OLEDs and have demonstrated large area (up to 12 cm × 12 cm), thin film encapsulated, flexible devices. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

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Section: Top-emissive Oleds On Metal Foilmentioning

confidence: 99%

Optimization of the efficacy and angle dependence of emission of top-emissive organic light-emitting diodes on metal foils

et al. 2011

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“…Although SUS substrate has been widely used for OLED displays [11][12][13][14] and they can be key element for flexible OLED lighting applications, there are few reports on their efficient heat dissipation for potential OLED lifetime improvement. Therefore, in this paper, we compared heat dissipation behaviors of top-emission OLEDs ͑TEOLEDs͒ fabricated on glass ͑TEOLED-g͒, and SUS ͑TEOLED-SUS͒ substrates.…”

mentioning

confidence: 99%

Substrate thermal conductivity effect on heat dissipation and lifetime improvement of organic light-emitting diodes

Chung

Lee

Jeong

et al. 2009

Applied Physics Letters

105

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We report substrate thermal conductivity effect on heat dissipation and lifetime improvement of organic light-emitting diodes ͑OLEDs͒. Heat dissipation behavior of top-emission OLEDs fabricated on silicon, glass, and planarized stainless steel substrates was measured by using an infrared camera. Peak temperature measured from the backside of each substrate was saturated to be 21.4, 64.5, and 40.5°C, 180 s after the OLED was operated at luminance of 10 000 cd/ m 2 and 80% luminance lifetime was about 198, 31, and 96 h, respectively. Efficient heat dissipation through the highly thermally conductive substrates reduced temperature increase, resulting in much improved OLED lifetime.

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“…In contrast to previously reported flexible displays on metal foils that integrate either amorphous TFTs with PLEDs ͑Ref. 10͒ or polysilicon TFTs with small-molecule OLEDs, 11,12 this work reports the integration of polysilicon TFTs with PLEDs. Polymers, used in AMPLED displays, are readily compatible with spin-cast or ink-jet printing process 14 that offers reduced process complexity compared with the evaporation of the small-molecule materials used in AMOLED displays.…”

mentioning

confidence: 81%

“…Demonstrations of OLEDs and PLEDs onto flexible substrates 4,5 as well as of amorphous 6 and polysilicon thin-film transistors 7-9 ͑TFTs͒ onto flexible metal foils have propelled the development of flexible AMOLED or AMPLED displays onto metal foils. [10][11][12] Thin metal foils are particularly attractive for flexible AMOLED or AMPLED displays because they are excellent barrier to water and oxygen that degrade the lifetime of these displays. Polysilicon TFTs offer a number of advantages for activematrix displays compared to amorphous silicon TFTs, such as higher carrier mobility, immunity to threshold-voltage shift, and ability to integrate complementary metal-oxidesemiconductor ͑CMOS͒ display driver circuits onto the display panel.…”

mentioning

confidence: 99%

Top-emitting 230dots∕in. active-matrix polymer light-emitting diode displays on flexible metal foil substrates

Chuang

Troccoli

Kuo

et al. 2007

Applied Physics Letters

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A top-emitting 230 dots/ in. monochrome active-matrix polymer light-emitting diode ͑PLED͒ display having the VGA format and fabricated on a flexible steel foil utilizing the polycrystalline silicon thin-film transistor ͑TFT͒ technology is reported. The pixel circuitry architecture consists of the conventional two TFT circuitries made of two p-channel metal-oxide-semiconductor ͑PMOS͒ transistors and one storage capacitor. The average field-effect hole mobility and threshold voltage of the PMOS polysilicon TFTs fabricated on the metal foil are 37͑±4͒ cm 2 / V s and −1.9͑±0.6͒ V, respectively. The light turn-on voltage of the PLED is 4.0 V.Active-matrix organic light-emitting diode ͑AMOLED͒ displays based on either small molecules 1 or polymer LED 2,3 ͑PLED͒ are envisioned as candidates for the next generation displays because of their light weight, low power, selfemission, wide viewing angle, and capability of being conformal or foldable. Demonstrations of OLEDs and PLEDs onto flexible substrates 4,5 as well as of amorphous 6 and polysilicon thin-film transistors 7-9 ͑TFTs͒ onto flexible metal foils have propelled the development of flexible AMOLED or AMPLED displays onto metal foils. 10-12 Thin metal foils are particularly attractive for flexible AMOLED or AMPLED displays because they are excellent barrier to water and oxygen that degrade the lifetime of these displays. Polysilicon TFTs offer a number of advantages for activematrix displays compared to amorphous silicon TFTs, such as higher carrier mobility, immunity to threshold-voltage shift, and ability to integrate complementary metal-oxidesemiconductor ͑CMOS͒ display driver circuits onto the display panel. Stainless steel foils, in particular, have superior chemical resistance in a number of chemical solutions used during the device fabrication, and they are stable during high-temperature thermal processing steps such as those used during the preparation of gate dielectric, thermal activation of dopants, and silicidation. In addition, the dimensional stability of the steel foil substrates enables the implementation of circuit designs with high resolution. Recently, we have demonstrated n-channel TFTs onto flexible steel foil substrates having both channel width and channel length as small as 1 m and with an effective electron mobility of 358 cm 2 / V s as well as high performance CMOS circuits suitable for integrated display driver applications. 9,13 In this letter we report the demonstration of a flexible AMPLED display onto flexible metal foil substrate. In contrast to previously reported flexible displays on metal foils that integrate either amorphous TFTs with PLEDs ͑Ref. 10͒ or polysilicon TFTs with small-molecule OLEDs, 11,12 this work reports the integration of polysilicon TFTs with PLEDs. Polymers, used in AMPLED displays, are readily compatible with spin-cast or ink-jet printing process 14 that offers reduced process complexity compared with the evaporation of the small-molecule materials used in AMOLED displays. The opaque nature of the flexible met...

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64.2: Full Color 100 dpi AMOLED Displays on Flexible Stainless Steel Substrates

Cited by 31 publications

References 16 publications

Optimization of the efficacy and angle dependence of emission of top-emissive organic light-emitting diodes on metal foils

Optimization of the efficacy and angle dependence of emission of top-emissive organic light-emitting diodes on metal foils

Substrate thermal conductivity effect on heat dissipation and lifetime improvement of organic light-emitting diodes

Top-emitting 230dots∕in. active-matrix polymer light-emitting diode displays on flexible metal foil substrates

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