Integrated Machining Error Compensation Method Using Omm Data

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  • Topic: Display device, Display technology, OLED
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AMOLED Displays
Current Developments and Reckless Predictions

1

Feb. 4, 2011

SID-LA

Nutmeg Consultants

Ken Werner
Principal, Nutmeg Consultants
2 Shady Brook Lane Norwalk, Connecticut 06854 kwerner@nutmegconsultants.com +203/644-2156

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Feb. 4, 2011

SID-LA

Nutmeg Consultants

Abstract: AMOLED Displays
The development of OLED displays has been a rocky road, with prediction after prediction running into delays and revisions. That’s typical for the development of new display technologies, but the huge promise of OLED coupled with the technology’s apparent simplicity made the delays particularly frustrating for OLED. Now, Samsung Mobile Display (SMD), the primary manufacturer of active-matrix OLEDs (AMOLEDs), can’t keep up with demand, and both SMD and LG Display are planning to ramp up Gen 5.5 fabs in mid-2011. These are exciting times for AMOLED, and we can expect an array of new AMOLED-based products, but the melodrama is not over.

As it turns out, although AMOLED technology appears simple, it isn’t. Great advances have been made on materials and device structure, resulting in vastly improved efficiency and lifetime, but the lifetime of blue emitters is still seriously deficient for many applications. Although the processes used for making both the OLED front planes and active-matrix backplanes are responsible for the technology’s current success, they are (at least in part) about to be pressed into use for the new, much larger fabs that will soon begin production – even though they have distinct limitations even for today’s generation. Process scalability is a critical issue if OLED displays are to be manufactured in larger sizes at a cost that allows them to be used in high-volume products. Therefore, it is not surprising that significant resources are being devoted to new processes that are suitable for fabs larger than Gen 5.5. In this overview, we will look at recent developments and current issues, and make some very specific (and perhaps slightly reckless) predictions about the immediate future.

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Feb. 4, 2011

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Nutmeg Consultants

Outline


What’s an OLED?
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Basic structure Not-so-basic structure Why use an active matrix backplane? Front plane Backplane Backplane Front plane



Basic processing
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What’s wrong with the processing status quo?
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Feb. 4, 2011

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Nutmeg Consultants

Outline (continued)


Now for materials
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Small-molecule (SM) vs. Polymer (RIP) SM Solution Processing Fluorescent vs. Phosphorescent Lifetime, efficiency, and color coordinates Structural work-arounds One major supplier of AMOLED panels Severe shortage Two new Gen 5.5 fabs scheduled for mid-year start-up SMD talking about Gen 8



Where are we now?
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Predictions – short term Predictions – longer term

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Feb. 4, 2011

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Nutmeg Consultants

Basic structure Not-so-basic-structure Real-world structure Basic operation Why use an AM backplane?

WHAT’S AN OLED?

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Feb. 4, 2011

SID-LA

Nutmeg Consultants

Very Basic Passive-matrix OLED


1963
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Martin Pope, NYU 5-nm-thick Anthracene crystal Blue light at 400 volts Tang and Van Slyke, Kodak Bi-layer organic structure Taming the wild hole 10 volts IQE = 1% Power conversion eff = 0.46%



1987



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Feb. 4, 2011

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Nutmeg Consultants

OLED Structure

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Feb. 4, 2011

SID-LA

Nutmeg Consultants

Practical OLED Structure

Source: UDC

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Feb. 4, 2011

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Nutmeg Consultants

OLED Operation

(Source: Nikon)

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Feb. 4, 2011

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Nutmeg Consultants

Why Use an AM Backplane?


Passive
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L = ID x TD (x C1) TD = 1/N x frame time L = ID/N x (x C2) Very high currents impact OLED efficiency and lifetime, and demand high-current power supplies N = 100 is practical max Pixel switch on through entire frame time Moderate diode...
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