14‐1: <i>Distinguished Paper:</i> A Multi‐Unit Compensation for OLED Burn‐In in Mobile Displays

Ok, Jiheon; Yu, Yonghoon; An, Joo-young; Na, Sewhan; Jang, Woo–Hyuk; Lim, Hyun‐Wook; Lee, Jae-Youl

doi:10.1002/sdtp.14637

Symp Digest of Tech Papers

2021

DOI: 10.1002/sdtp.14637

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14‐1: Distinguished Paper: A Multi‐Unit Compensation for OLED Burn‐In in Mobile Displays

Jiheon Ok

Yonghoon Yu

Joo-young An

et al.

Abstract: In this paper, a cost‐effective OLED display burn‐in compensation method on a mobile system is proposed. The sub‐pixel wise compensation map is estimated using the data‐counting approach and is reallocated to multi‐unit regional map according to amount of burn‐in details. The degraded luminance compensation is applied for the display driver IC without the additional external storage. With the optimized multi‐unit map, perceptual quality can be enhanced after compensation with limited internal memory. Experimen… Show more

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2023

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Cited by 3 publications

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7‐3: A New Line‐by‐Line SWEEP Signal Generation Method for PWM Driving MicroLED TFT Pixel Circuit

Kang,

Park,

Park

et al. 2023

Symp Digest of Tech Papers

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This paper proposes a novel method to generate a SWEEP signal line‐by‐line for PWM driving microLED pixel circuit. The proposed method generates a SWEEP signal based on the linearly increasing voltage of the capacitor by flowing a constant current to the horizontal line parasitic capacitive load. The constant current is supplied by the sweep generation (SG) circuit in each line. Since the SG circuit utilizes the existing SCAN signals for the pixel circuit, additional SCAN or clock signals are not required. By using the proposed method, an individual SWEEP signal for each line can be generated without a significant increase in operational complexity in the display panel.

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7‐3: A New Line‐by‐Line SWEEP Signal Generation Method for PWM Driving MicroLED TFT Pixel Circuit

Kang,

Park,

Park

et al. 2023

Symp Digest of Tech Papers

View full text Add to dashboard Cite

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A New PWM Operational Scheme for MicroLED Displays Using Inverter and Dynamic SWEEP Signal Slope for Low Gray Level Expression

Kang,

Park,

Park

et al. 2023

IEEE Access

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In this paper, we present a novel pulse width modulation (PWM) operational scheme for micro-light-emitting-diode (μLED) displays using inverter and dynamic SWEEP signal slope. In the proposed PWM operational scheme, the slope of the SWEEP signal steepens as the gray level decreases. This adjustable SWEEP signal slope further shortens the falling time compared to the inverter-only strategy, leading to an exceptional capability to express extremely low gray levels. We implement the proposed scheme with low-temperature poly-Si oxide (LTPO) thin-film transistor (TFT) pixel circuit, and verify the operation through HSPICE based on measured TFT data. The simulation results show that the proposed scheme can significantly shorten the falling time to under 1 μs level. The gray level of 14 G is accurately expressed without wavelength shift or pulse distortion, achieving a falling time of 0.21 μs. In addition, we also verify the compensation accuracy of the pixel circuit, and the results indicate that the proposed pixel circuit can reliably compensate for TFT variations.

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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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14‐1: Distinguished Paper: A Multi‐Unit Compensation for OLED Burn‐In in Mobile Displays

Cited by 3 publications

References 5 publications

7‐3: A New Line‐by‐Line SWEEP Signal Generation Method for PWM Driving MicroLED TFT Pixel Circuit

7‐3: A New Line‐by‐Line SWEEP Signal Generation Method for PWM Driving MicroLED TFT Pixel Circuit

A New PWM Operational Scheme for MicroLED Displays Using Inverter and Dynamic SWEEP Signal Slope for Low Gray Level Expression

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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