50.3: A Novel Power Saving Technology for OLED TV with External TFT Compensation

This paper presents the latest technology called ‘Adaptive SVDD’ which helps to reduce power consumption and also to increase gray scale for OLED displays. This method is equipped with ‘external compensation technology’ that is suitable for large sized OLED displays in that it substantially reduces...

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Bibliographic Details
Published in:SID International Symposium Digest of technical papers 2014-06, Vol.45 (1), p.728-731
Main Authors: Kim, Tae-Gung, Kim, Seung-Tae, Yu, Sang-Ho, Woo, Kyung-Don, Ha, Woo-Suk, Kim, Bum-Sik, Ahn, Byung-Chul
Format: Article
Language:English
Subjects:
adaptive
AMOLED
Compensation
Diodes
Electric potential
external compensation
Gray scale
low power
oxide TFT
Power consumption
Semiconductor devices
SVDD
Television
Thin film transistors
Voltage
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Summary:This paper presents the latest technology called ‘Adaptive SVDD’ which helps to reduce power consumption and also to increase gray scale for OLED displays. This method is equipped with ‘external compensation technology’ that is suitable for large sized OLED displays in that it substantially reduces the number of TFTs and capacitors. This ‘external compensation technology’ requires arithmetic operation, which needs to be driven externally, of VTH and mobility of TFTs. Since VTH has a tendency to move toward positive direction and to have much wider variation by TFT degradation, input voltage range has to be considered with a marginal VTH which is expected to increase. And this marginal voltage results to increase supplying voltage of a source driver IC and to reduce gray scale. The presented technology details in overhead optimization corresponded to VTH margin so that the power consumption is reduced and the image quality is increased. This technology was applied to 55inch OLED TV. To make it short, it could decrease 25% of voltage, 30.6% of the power consumption. Furthermore, it could increase gray scale to 25.8%.
ISSN:0097-966X
2168-0159
DOI:10.1002/j.2168-0159.2014.tb00191.x