Ppt by Vignesh

TRANSPARENT ACTIVE MATRIX ORGANIC LIGHT-EMITTING DIODE (OLED) DISPLAY

DRIVEN BY NANOWIRE TRANSISTOR

Presented by:

VIGNESH CDSP 2st sem10MT61DS22

CONTENT1. INTRODUCTION2. ORGANIC LED (OLED)3. NANOWIRE TRANSISTORS4. FABRICATION PROCESS5. EQUIVALENT CKT FOR A SINGLE ACTIVE PIXEL6. NW-AMOLED DISPLAY DEVICES7. ADVANTAGES & DISADVANTAGES8. APPLICATIONS 9. CONCLUSION10.REFERENCE

CET DIGITAL SIGNAL PROCESSING

INTRODUCTION

Optically transparent, mechanically flexible displays are

attractive for next-generation visual technologies and portable

electronics.

In principle organic light-emitting diodes (OLEDs) satisfy key

requirements for this application.

However, to realize transparent, flexible active-matrix OLED

(AMOLED) displays requires suitable thin-film transistor (TFT)

drive electronics, Nanowire transistors (NWTs) are ideal

candidates for this role.CET DIGITAL SIGNAL PROCESSING

ORGANIC LED (OLED) OLED is a solid-state semiconductor device that is 100 to 500

nanometers thick or about 200 times smaller than a human hair.


An OLED consists of the following parts:

1.Substrate.

2.Anode.

3.Organic layers.

-Conducting layer.

-Emissive layer.

4.Cathode.

HOW DO OLED EMITS LIGHT


NANOWIRE TRANSISTORS

The circuitry required for each AM display pixel must

contain

3 nano wire transistor.

-one switching transistor.

-two driver transistor.

-storage capacitor, with appropriate scan and data lines to

allow selective pixel addressing.


FABRICATION PROCESS The fabrication begins with a 200 nm thick SiO2 layer deposited on

glass substrates.

Next, a 100 nm ITO thin film is deposited by ion-assisted

deposition & subsequently patterned by photolithography.


Next, a 22 nm layer of SAND is

deposited on the patterned ITO

gate electrodes via solution self-

assembly.

ITO S–D electrodes are then

deposited by IAD. Next, a 200 nm thick SiO2 layer is deposited by e-beam evaporation.

FABRICATION PROCESS Now expose the PLED ITO anodes, and PEDOT-PSS is spin-coated.

TPD–Si2 + TFB polymer blend HTL + EBL is spin-coated.

Then, a well-balanced charge transport/emissive layer (EML), a TFB

+ F8BT blend is spin-coated.


Inside of a glovebox, LiF and Al

are thermally evaporated onto

the EML .

The NW-AMOLED devices are

then encapsulated with glass

using an UV-curable epoxy.

PDOT:POLY ETHYLENE DIOXY THIOPENE

PSS: POLY STYRENE SULFONATE

TFB+TPD-SI2: POLY DIOCTYL FLUORENE CO METHYLPROPYL

TFB+F8BT: POLY DIOCTYL FLUORENE CO

BENZOTHIODIAZOLE

LIF: ELECTRON INJECTION LAYER

EQUIVALENT CKT FOR A SINGLE ACTIVE PIXEL


Consists of

-one switching transistor (T1)

-two driving transistors (T2 and T3).

-one storage capacitor (Cst).

NW-AMOLED DISPLAY DEVICES

Figure A,B & C shows a magnified image of the array at various

values of the data line voltage Vdata is for 1, 2, and 3 V.


Figure D & E shows optical images of a 15 pixel × 8 pixel array

with selective pixel line addressed independently by controlling

Vdata line.

Fig A Fig B Fig C

Fig D Fig E

FULLY TRANSPAREANT NW-AMOLED DISPLAY ELEMENTS

• Fig 1shows an Optical image of a fully transparent NW-AMOLED

substrate.

• Fig 2 shows an Optical images of a 2 × 2 mm NW-AMOLED

array.


ADVANTAGES Transparent OLED provides higher refresh rate and

consumes less power.

Slimmer.

Faster.

Good for Eyes.

Large Viewing Angle.


DISADVANTAGES

Transparent oled is difficult to view in sunlight.

Short lifetime.

Highly Water prone.

High Cost.


APPLICATIONS Military application: top emitting oled (TOLED).

Commercial Applications

-contact lens


APPLICATIONS

• Light car


CONCLUSION

Transparent OLED is a technology of future.

This technology is certainly going to find a way for itself if

not now then in future.


REFERENCE Photo physics of Organometallics Arvind Kumar, Shih-Sheng

Sun, and Alistair J. Lees

Madelung, O., Ed. Technology and Applications of

Amorphous Silicon; Springer: Berlin, 2000.

www.wikipedia.org/organic_led

www.oled-info.com

oled-display.net/how-works-the- oled-technology


Thank you


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