9.4: A Novel Current Programmed Pixel for Active Matrix OLED Displays

Ohta, M.; Tsutsu, Hiroshi; Takahara, Hiroshi; Kobayashi, Ikunori; Uemura, T.; Takubo, Yoneharu

doi:10.1889/1.1832217

Cited by 40 publications

(36 citation statements)

References 1 publication

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“…[2][3][4][5][6][7][8][9][10][11][12][13] Among them, a time-ratio gray-scale method with a simple pixel circuit comprised of two transistors and a storage capacitor, is known to give excellent image uniformity. 14,15 In this method, a gray level is produced by turning the OLED in each pixel on or off during each of multiple subframe periods. [6][7][8][9]12 This approach can achieve a very high-resolution AMOLED display with more than 300 ppi because it requires a small number of TFT devices in each pixel and few global signal or power lines across a pixel.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

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

et al. 2009

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“…The output switches alternate their connections to between Data Line [1] and Data Line [2] in accordance with the operation timing diagram.…”

Section: B Amoled Panel Application Of Itcf Drivermentioning

confidence: 99%

“…It has been reported that the current driving scheme is the most effective driving scheme that provides uniform operation of the OLEDs by compensating for the dispersions in their electrical characteristics, as well as the variations of V TH and the mobility of the pixel TFTs [1].…”

Section: Introductionmentioning

confidence: 99%

Improved Transient Current Feedforward Output Buffer for Fast and Compact Active-Matrix OLED Column Drivers

Jeon

Son

Jeon

et al. 2009

IEEE Trans. Circuits Syst. II

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An improved transient current feedforward driver is designed for compact implementation and low-power consumption by adopting the demultiplexing operation of the proposed driver based on the fast driving speed of 6 μs for the panel load of 6 kΩ/40 pF, which is equivalent to that of extended-graphicarray active-matrix organic light-emitting diode displays. The driver has the structural advantages of simple frequency compensation and low-power consumption, which come from the elimination of an internal operational transconductance amplifier (OTA). The chip implementation confers that the area of the driver is 32.5 × 217 μm 2 , and the power consumption is 6.5 μA for each channel.Index Terms-Active-matrix organic light-emitting diode (AMOLED), column driver, transient current feedforward.

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“…Organic light-emitting-diode (OLED) displays have many advantages, such as fast response time, thin form factor, light weight, wide viewing angle and high luminance. [1][2][3][4][5][6][7][8][9][10][11] OLED displays can be a cost-effective solution because of the existence of wide viewing angles without using an extra process, no color filters, and backlights, and a polarizer film on one side compared with that for liquid-crystal displays (LCDs). These attractive points make OLEDs promising displays for large-screen television, but they are still limited to small-or middle-sized display applications 2 because of the difficulty in achieving large-area active-matrix organic light-emitting-diode (AMOLED) panels and satisfactory uniformity of picture quality in large-area high-resolution panels.…”

Section: Introductionmentioning

confidence: 99%

Voltage‐programming method with transimpedance‐feedback technique for threshold voltage and mobility compensations in large‐area high‐resolution AMOLED displays

Kwag

Kang

et al. 2006

J Soc Info Display

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Abstract— A voltage‐programming method with transimpedance‐feedback control technique is proposed for compensating threshold voltage and mobility variations of driving thin‐film transistors (TFTs) in large‐area high‐resolution polycrystalline‐silicon (poly‐Si) active‐matrix organic light‐emitting‐diode (AMOLED) displays. Those electrical characteristic variations of TFTs throughout a large‐area high‐resolution panel result in picture‐quality non‐uniformity of AMOLED displays. The simulation and experimental results of the proposed method show that the maximum emission‐current error for 30‐in. full‐high‐definition television (HDTV) applications is less than 1.9% when the mobility variation and the threshold‐voltage variation are ±12.5% and ±0.3 V, respectively. The proposed method is the best programming method for large‐area high‐resolution AMOLEDs among the published methods.

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9.4: A Novel Current Programmed Pixel for Active Matrix OLED Displays

Cited by 40 publications

References 1 publication

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

Improved Transient Current Feedforward Output Buffer for Fast and Compact Active-Matrix OLED Column Drivers

Voltage‐programming method with transimpedance‐feedback technique for threshold voltage and mobility compensations in large‐area high‐resolution AMOLED displays

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