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50.3: A Novel Power Saving Technology for OLED TV with External TFT Compensation
Author(s) -
Kim TaeGung,
Kim SeungTae,
Yu SangHo,
Woo KyungDon,
Ha WooSuk,
Kim BumSik,
Ahn ByungChul
Publication year - 2014
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/j.2168-0159.2014.tb00191.x
Subject(s) - thin film transistor , capacitor , power consumption , voltage , oled , electrical engineering , compensation (psychology) , computer science , overhead (engineering) , power (physics) , materials science , engineering , physics , psychology , layer (electronics) , quantum mechanics , psychoanalysis , composite material
This paper presents the latest technology called ‘Adaptive SV DD ’ 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 V TH and mobility of TFTs. Since V TH 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 V TH 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 V TH 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%.