An integrated poly‐Si TFT current data driver with a data‐line pre‐charge function

Shimoda, Masamichi; Abe, Katsumi; Haga, Hiroshi; Asada, Hideki; Hayama, Hiroshi; Iguchi, K.; Iga, D.; Imura, H.; Miyano, S.

doi:10.1889/1.1821286

Cited by 11 publications

(8 citation statements)

References 3 publications

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“…All the current sources were matched by placing resistors of the same resistance after resistance measurement, to make the uniformity of the current sources comparable to that of a monolithic integrated circuit (IC). 21,22 For the same purpose, all the resistors of the voltage dividers and those of the non-inverting amplifiers with an offset were also matched to one another, and the input code of each DAC was summed with an offset code for that DAC. When I ON was adjusted to 250 µA, the maximum current difference between two current sources was less than 0.3% of the average current.…”

Section: Driver Board Designmentioning

confidence: 99%

Reducing image sticking in AMOLED displays with time‐ratio gray scale by analog calibration

et al. 2009

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Abstract— Early loss of image uniformity has been a critical drawback of active‐matrix organic light‐emitting‐diode (AMOLED) displays operated in time‐ratio gray‐scale mode. This problem is addressed with an analog calibration technique which measures the voltage across each OLED for a given current and subsequently controls the supply voltage of pixels and the voltage drop across the driving th in‐film transistor (TFT) of each OLED. The uniformity of test cells, which were aged to produce image sticking in a chessboard pattern, were improved. A measure of image sticking, called the extracted image‐sticking value (EISV), was formulated, which is developed and used for the quantitative evaluation of the calibration method. OLED voltages over a range of about 0.35 V were compensated to produce more uniform OLED currents than those before aging. The variation of luminance associated with image sticking was reduced by about 40% for a full‐white image after between 2 and 10 hours of accelerated aging with a constant voltage of 8 V across an OLED.

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Section: Driver Board Designmentioning

confidence: 99%

Reducing image sticking in AMOLED displays with time‐ratio gray scale by analog calibration

et al. 2009

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“…Schematic and timing diagrams of (a) prior voltage-programming pixel, 16) and (b) current-programming pixel with voltage precharging. 17 programming method 17) has the error of 309.5% for 30-in. full HDTV conditions.…”

Section: Discussionmentioning

confidence: 99%

“…HDTV with V th and mobility variation of driving TFTs of (a) voltage-programming pixel, 16) and (b) current-programming pixel. 17)…”

Section: Discussionmentioning

confidence: 99%

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Current-Sensing and Voltage-Feedback Driving Method for Large-Area High-Resolution Active Matrix Organic Light Emitting Diodes

In¹,

Choi²,

Chung³

et al. 2006

jjap

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There is the problem of picture quality nonuniformity due to thin film transistor (TFT) characteristic variations throughout a panel of large-area high-resolution active matrix organic light emitting diodes. The current programming method could solve this issue, but it also requires very long charging time of a data line at low gray shades. Therefore, we propose a new driving method and a pixel circuit with emission-current sensing and feedback operation in order to resolve these problems. The proposed driving method and pixel circuit successfully compensate threshold voltage and mobility variations of TFTs and overcome the data line charging problem. Simulation results show that emission current deviations of the proposed driving method are less than 1.7% with AE10:0% mobility and AE0:3 V threshold voltage variations of pixel-driving TFTs, which means the proposed driving method is applicable to large-area high-resolution applications.

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“…3 with time binary-weighted digital data. 24 A reference current is used in the place of current data.…”

Section: Current Data V T Compensationmentioning

confidence: 99%

V_t Compensated voltage‐data a‐Si TFT AMOLED pixel circuits

Sanford

Libsch

2004

J Soc Info Display

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Abstract— Active‐matrix organic light‐emitting‐diode (AMOLED) displays are now entering the marketplace. The use of a thin‐film‐transistor (TFT) active matrix allows OLED displays to be larger in size, higher in resolutions and lower in power dissipation than is possible using a conventional passive matrix. A number of TFT active‐matrix pixel circuits have been developed for luminance control, while correcting for initial and electrically stressed TFT parameter variations. Previous circuits and driving methods are reviewed. A new driving method is presented in which the threshold‐voltage (Vt) compensation performance, along with various circuit improvements for amorphous‐silicon (a‐Si) TFT pixel circuits using voltage data, are discussed. This new driving method along with various circuit improvements is demonstrated in a state‐of‐the‐art 20‐in. a‐Si TFT AMOLED HDTV.

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An integrated poly‐Si TFT current data driver with a data‐line pre‐charge function

Cited by 11 publications

References 3 publications

Reducing image sticking in AMOLED displays with time‐ratio gray scale by analog calibration

Reducing image sticking in AMOLED displays with time‐ratio gray scale by analog calibration

Current-Sensing and Voltage-Feedback Driving Method for Large-Area High-Resolution Active Matrix Organic Light Emitting Diodes

V_t Compensated voltage‐data a‐Si TFT AMOLED pixel circuits

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An integrated poly‐Si TFT current data driver with a data‐line pre‐charge function

Cited by 11 publications

References 3 publications

Reducing image sticking in AMOLED displays with time‐ratio gray scale by analog calibration

Reducing image sticking in AMOLED displays with time‐ratio gray scale by analog calibration

Current-Sensing and Voltage-Feedback Driving Method for Large-Area High-Resolution Active Matrix Organic Light Emitting Diodes

Vt Compensated voltage‐data a‐Si TFT AMOLED pixel circuits

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V_t Compensated voltage‐data a‐Si TFT AMOLED pixel circuits