Data Driver for TFT Displays With Uniform Column Current Output


Advances in thin film transistor technology and improved performance of organic light emitting materials have catalyzed the development of display applications. However, variations in properties of the devices that from these panels yield noticeable display brightness non-uniformity due internal electronic circuits.


Lehigh University has developed new circuits to overcome this issue by reducing yield while they occupy a large area of the display. The external circuits, or data drivers, produce high levels of uniformity without increasing display complexity. Other advantages include reduction of sensitivity to device parameter variations, reduced number of transistors, increased aperture ratio. Experimental results have shown that non-uniformity was reduced from 70% to below 0.5% for two pixels driven with the standard technique.


Lehigh Tech ID# 122804-01



The SSL market is predicted to be around $33 billion by, growing annually at over 10%.[1] This market is an umbrella market for LEDs, OLEDs, and PLEDs with OLEDs being around $1.25 million.[2] Additionally, 22% of the United States electricity is consumed by lighting, which costs consumers over $50 billion each year. Novel lighting technologies have the potential to reduce this consumption by up to six times less. This potential has led to increased market need, funding resources and science centers dedicated to advancing developments, such as the $46 million Energy Frontier Research Center (EFRC) for solid-state lighting science funded by the Department of Energy.[3]


[1] “Solid-State Lighting Market Will Reach $33 Billion Worldwide by 2013.” web site. (accessed September 28, 2010).

[2] “Advancements in Solid-State Lighting (Technical Insights) September 2007. Frost & Sullivan web site (subscription required). (accessed September 21, 2012).

[3] Solid-state lighting's contributions to national energy efficiency discussed at AAAS meeting.” February 21, 2010. PHYSORG web site. (accessed

September 28, 2010). 



Lehigh University is interested in licensing this technology. 

App Type Country Serial No. Patent No. File Date Issued Date Expire Date
Utility United States 11/608,881 8,390,536 12/11/2006 3/5/2013 12/31/2030
Nationalized PCT China 200780050888 102177487A 6/11/2009    
Nationalized PCT Korea 10-2009-7014517 10-1462695 6/11/2009 11/11/2014 12/11/2027
Nationalized PCT Japan 2009-541325 JP6043044B2 6/11/2009    
European Patent Council [EPC] European Patent Office 07 867 692.1   7/10/2009    
For Information, Contact:
Rick Smith
Lehigh University
Miltiadis Hatalis
Matias Troccoli
Data Driver
High Quality Optics