• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1997.04a
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• pp.265-268
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• 1997

Electroluminescent(EL) devices are constructed using multilayer organic thin film. A cell structure of glass substrate/Indium-Tinoxide/TPD as a hole transporting layer/Alq3+Rhodamine 101 perchrolate(Red3) as an emitting layer/Alq3 as an electrron transporting layer/Al as an electrode was employed. Optimal thickness of emitting layer in EL cell was performed from the viewpoint of the electronics properties of emitting layers. The general vapor-deposition method was used to control the thickness of omitting layer in EL devices and electro-optical characteristics were measured. It is clarified that controlling thickness of emitting layer in vapor-deposition film had an effect on the change of carrier injection and EL spectrum. The intensity of red omission with luminance of 81cd/$m^2$ was achived at 11V driving voltage. The surface morphology of emitting layer in EL devices was investigated.

• Proceedings of the Korean Vacuum Society Conference
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• 2009.02a
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• pp.253-253
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• 2009

• Proceedings of the Korean Vacuum Society Conference
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• 2009.02a
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• pp.252-252
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• 2009

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.973-974
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• 2008

Optically transparent and flexible electronic circuits and displays are attractive for next-generation visual technologies, including windshield displays, head-mounted displays, and transparent screen monitors. Here we report on the fabrication of transparent transistors and circuits based on the combination of nanoscopic dielectrics and organic, inorganic, or hybrid semiconductors. Furthermore, the first demonstration of a transparent and flexible AMOLED display driven solely by $In_2O_3$ nanowire transistors (NWTs) is reported. The display region exhibits an optical transmittance of ~35% and a green peak luminance of ${\sim}300\;cd/m^2$. These results indicate that NWT-based drive circuits are attractive for fully transparent display technologies.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2002.07a
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• pp.185-189
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• 2002

Flexible displays such as plastic based LCDs and organic light-emitting diodes for mobile communication devices have been researched and developed at KETI in KOREA since 1997. The Plastic film substrate has so poor thermal tolerance and non-rigidness that the fabrication of active devices and panel assembly have to perform at low temperature and pressure. In addition, high thermal expansion of the substrate is also a serious problem for reliable metallic film deposition. In this paper, we investigated particularly on the fundamental characteristics of various plastic substrates and then, suggested novel methods that improve the fabrication processes of plastic LCD panel. In order to maintain stable substrate surface and uniform cell gap during panel assembly, we utilized newly-invented iii and vacuum chuck. Electro-optical characteristics of fabricated plastic LCD are better than or equivalent to those of typical glass based LCDs though it is thinner, lighter-weight and more robust.

• Transactions on Electrical and Electronic Materials
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• v.4 no.2
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• pp.10-14
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• 2003

Flexible displays such as plastic-based liquid crystal displays (LCDs) and organic light-emitting diode displays (OLEDDs) have been researched and developed at KETI since 1997. The plastic film substrate is very weak to heat and pressure compared to glass substrate, that its fabrication process is limited to 110$^{\circ}C$ and low pressure. The ITO films were deposited on the bare plastic film substrate by rf-magnetron sputtering. Moreover, in order to maintain uniform cell gap and pressure on the plastic film substrate, we utilized newly-invented jig and fabrication process. Electro-optical characteristics were better than or equivalent to those of typical glass LCDs though it is thinner, lighter-weight, and more robust than glass LCDs.

• Proceedings of the IEEK Conference
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• 2003.07b
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• pp.919-922
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• 2003

This paper presents a novel low power driving circuit for passive matrix organic lighting emitting diodes (OLED) displays. The proposed driving method for a low power OLED driving circuit which reduce large parasitic capacitance in OLED panel only use current driving method, instead of mixed mode driving method which uses voltage pre-charge technique. The driving circuit is implemented to one chip using 0.35${\mu}{\textrm}{m}$ CMOS process with 18V high voltage devices and it is applicable to 96(R.G.B)X64, 65K color OLED displays for mobile phone application. The maximum switching power dissipation of driving power dissipation is 5.7mW and it is 4% of that of the conventional driving circuit.

• Proceedings of the IEEK Conference
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• 2003.07b
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• pp.1149-1152
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• 2003

Now a days, many different kinds of display technologies such as Liquid Crystal Display (LCD), Organic Light Emitting Diode (OLED), and Liquid Crystal On Silicon (LCOS) are designed. And these display technologies will be used in many application products like High Definition Televisions (HDTVs) or mobile devices. In this paper, pattern generation circuit for display test is proposed. The proposed circuit will be embedded in the control circuit of display chip. Two differenct kinds of patterns is generated by the circuit. One is block pattern for color test, and the other is line pattern for pixel test. The shape of test pattern is determined by the values of registers in pattern generation circuit. The circuit is designed using Verilog HDL RTL code.

• ETRI Journal
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• v.34 no.5
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• pp.727-733
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• 2012

This paper demonstrates a new driving scheme that allows reducing the supply voltage of data drivers for low-power active matrix organic light-emitting diode (AMOLED) displays. The proposed technique drives down the data voltage range by 50%, which subsequently diminishes in the peak power consumption of data drivers at the full white pattern by 75%. Because the gate voltage of a driving thin film transistor covers the same range as a conventional driving scheme by means of a level-shifting scheme, the low-data supply scheme achieves the equivalent dynamic range of OLED currents. The average power consumption of data drivers is reduced by 60% over 24 test images, and power consumption is kept below 25%.

• Proceedings of the KIEE Conference
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• 1996.07c
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• pp.1562-1564
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• 1996

Langmuir-Blodgett (LB) method have been used by many rescarcher because of its facility to control the thickness of film as molecular order and orientation of molecular. We fabricated MIM device using copolymer LB films of $2C_{18}MA-VE_2$ and elecctrical conduction mechanism in ultra-thin LB film were investigated. In our experimental results, the maleate copolymer LB film have the properity of insulator like organic ultra-thin fiim. Its diclcctric constant was about 3.5 and its voltage generation about 0.1 Volt. And Schottky current was apeared as electrical conduction current and Schottky barrier was about 0.9(eV).