Novel Top-Anode OLED/a-IGZO TFTs Pixel Circuit for 8K4K AM-OLEDs

Lai, Po-Chun; Lin, Chih‐Lung; Kanicki, Jerzy

doi:10.1109/ted.2018.2877945

Cited by 18 publications

(10 citation statements)

References 21 publications

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“…As a result, the simulated results confirm that the proposed 6T1C pixel circuit shows a superior performance when operating under VTH and mobility compensation, making it highly suitable for portable displays. In Table 2, the comparison between the proposed and previously published pixel circuits [20,21,[24][25][26] demonstrates the advantages of the proposed 6T1C circuit, including the single storage capacitor structure, the minimum numbers of signal lines, excellent V TH_TFT and mobility compensation capability, independence from IR-drop and OLED degradation (V TH_OLED ) issues, and low-voltage driving. As a result, the simulated results confirm that the proposed 6T1C pixel circuit shows a superior performance when operating under V TH and mobility compensation, making it highly suitable for portable displays.…”

Section: Resultsmentioning

confidence: 90%

An Active-Matrix Organic Light-Emitting Diode Pixel Circuit Featuring Mobility Compensation for Portable Applications

Fan,

Lin,

Liu

2023

Micromachines

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A 6T1C pixel circuit based on low-temperature polycrystalline oxide (LTPO) technology for portable active-matrix organic light-emitting diode (AMOLED) display applications is proposed in this paper. For superior high-end portable applications including 4K high resolution and high PPI (pixels per inch), the proposed pixel circuit employs a single storage capacitor and signal sharing switch-control design and provides low-voltage driving and immunity to the IR-drop issue and OLED degradation. Furthermore, the threshold voltage and mobility-compensating capabilities are improved by both compensation mechanisms, which are based on a negative feedback system, and mobility-related compensation parameters. Simulation results reveal that threshold voltage variations of ±0.33 V in the driving thin-film transistors can be well sensed and compensated while the maximum OLED current shift is 4.25%. The maximum variation in OLED currents within all gray levels is only 1.05% with mobility variations of ±30%. As a result, the proposed 6T1C pixel circuit is a good candidate for portable AMOLED display usage.

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Section: Resultsmentioning

confidence: 90%

An Active-Matrix Organic Light-Emitting Diode Pixel Circuit Featuring Mobility Compensation for Portable Applications

Fan,

Lin,

Liu

2023

Micromachines

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“…Y. Kim et al [17] presented a 5T1C pixel circuit with the enhanced reliability, but it can't compensate the OLED degradation. Although other reported circuits [18][19][20] could compensate V TH variation of the TFT, OLED degradation, and I-R drop of V DD , only the proposed pixel circuit could operate with low driving voltage (<5 V). The proposed pixel circuit using a-IZTO TFT as a driving device is thus a favorable candidate to simultaneously compensate for V TH , I-R drop, and OLED degradation problems in portable displays with high resolution.…”

Section: Resultsmentioning

confidence: 97%

“…The current-resistance (I-R) drop of power lines generated from each pixel in varying location also causes image degradation [16]. Several pixel circuits that use LTPS TFTs or a-IGZO TFTs as driving devices have been proposed to overcome these problems, including V TH variation of the driving TFT, OLED degradation, and the I-R drop of power lines (V DD ) [17][18][19][20]. Kim et al [17] presented a 5T1C pixel circuit with the enhanced reliability, but it can't compensate the OLED degradation.…”

Section: Introductionmentioning

confidence: 99%

New Low-Voltage Driving Compensating Pixel Circuit Based on High-Mobility Amorphous Indium-Zinc-Tin-Oxide Thin-Film Transistors for High-Resolution Portable Active-Matrix OLED Displays

et al. 2020

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In recent years, active-matrix organic light-emitting diodes (AMOLEDs) has been the most popular display for portable application. To satisfy the requirement for the application of the portable display, the design of the compensating pixel circuit with the low-voltage driving and low-power consumption will be requested. In addition to the circuit with the design of the low-voltage driving, high-mobility thin-film transistors as driving device will be also necessary in order to supply larger driving current at low-voltage driving. Therefore, the study presents a new low-voltage driving AMOLED pixel circuit with high-mobility amorphous indium–zinc–tin–oxide (a-IZTO) thin-film transistors (TFTs) as driving device for portable displays with high resolution. The proposed pixel circuit can simultaneously compensate for the threshold voltage variation of driving TFT (ΔVTH_TFT), OLED degradation (ΔVTH_OLED), and the I-R drop of a power line (ΔVDD). By using AIM-Spice for simulation based on fabricated a-IZTO TFTs with mobility of 70 cm2V−1S−1 as driving devices, we discovered that the error rates of the driving current were all lower than 5.71% for all input data when ΔVTH_TFT = ±1 V, ΔVDD = 0.5 V, and ΔVTH_OLED = 0.5 V were all considered simultaneously. We revealed that the proposed 5T2C pixel circuit containing a high-mobility a-IZTO TFT as a driving device was suitable for high-resolution portable displays.

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“…4. The off current in the measured data is about 10 −11 A, because the lower measurement range of our experimental condition was limited due to the instrument resolution [22]. However, it has been reported that the off current of a-IGZO TFT is much lower than 10 −11 A, so we modeled the off current as the conventional value [23], [24].…”

Section: Simulation and Discussionmentioning

confidence: 99%

A Compact Amorphous In-Ga-Zn-Oxide Thin Film Transistor Pixel Circuit With Two Capacitors for Active Matrix Micro Light-Emitting Diode Displays

Kang

Park

Kang

et al. 2023

IEEE J. Electron Devices Soc.

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In this paper, we propose a novel amorphous In-Ga-Zn-oxide (a-IGZO) thin film transistor (TFT) pixel circuit for pulse width modulation (PWM) driving active matrix micro light-emitting diode (LED) displays. The proposed pixel circuit compensates for wavelength shifts according to gray level and threshold voltage (VTH) variation of TFTs with only two capacitors. This compact operation can be achieved by simultaneous compensation for VTH along with data input in the constant current generation (CCG) circuit and the PWM circuit, which consist the pixel. Since the VTH variation in TFTs is compensated, the proposed pixel circuit can supply a uniform and stable current to the LED throughout all gray levels. The compensation accuracy was verified by HSPICE with an oxide TFT model based on the measurement data.In addition, we analyzed the optimization method to improve the PWM driving by controlling the electrical properties of TFT, and verified this approach by simulation.

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Novel Top-Anode OLED/a-IGZO TFTs Pixel Circuit for 8K4K AM-OLEDs

Cited by 18 publications

References 21 publications

An Active-Matrix Organic Light-Emitting Diode Pixel Circuit Featuring Mobility Compensation for Portable Applications

An Active-Matrix Organic Light-Emitting Diode Pixel Circuit Featuring Mobility Compensation for Portable Applications

New Low-Voltage Driving Compensating Pixel Circuit Based on High-Mobility Amorphous Indium-Zinc-Tin-Oxide Thin-Film Transistors for High-Resolution Portable Active-Matrix OLED Displays

A Compact Amorphous In-Ga-Zn-Oxide Thin Film Transistor Pixel Circuit With Two Capacitors for Active Matrix Micro Light-Emitting Diode Displays

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