UHD AMOLED Driving Scheme of Compensation Pixel and Gate Driver Circuits Achieving High-Speed Operation

Lin, Chih‐Hsun; Chen, Po-Syun; Deng, Ming-Yang; Wu, Chia-En; Chiu, Wen-Ching; Lin, Yu-Sheng

doi:10.1109/jeds.2017.2763601

Cited by 24 publications

(13 citation statements)

References 15 publications

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“…Since the backlight transmittance of an LCD panel is typically less than 7% [3], the driving current of a mini-LED must be at the milliampere level to achieve enough light intensity. Hence, a low-temperature poly-crystalline silicon thin-film transistor (LTPS TFT) is used in AM methods to drive mini-LEDs owing to its high mobility and excellent current driving capability [4]- [6]. For example, the conventional 2T1C driving circuit has already been used in mini-LED backlight units in current LCD products [7].…”

Section: Introductionmentioning

confidence: 99%

AM PWM Driving Circuit for Mini-LED Backlight in Liquid Crystal Displays

Lin

Chen

Deng

et al. 2021

IEEE J. Electron Devices Soc.

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This work proposes a mini-LED driving circuit that adopts the pulse-width modulation (PWM) driving method for use in a liquid-crystal display (LCD) backlight. The proposed circuit can compensate for the threshold voltage (VTH) variation in a lowtemperature poly-crystalline silicon thin-film transistor (LTPS TFT) and a VSS current-resistance (I-R) rise, to generate a stable driving current to power the mini-LED. Since the proposed circuit uses the PWM method, the mini-LED can be operated at the best luminance-efficacy point, minimizing the power consumption of the circuit. The electrical characteristic of fabricated LTPS TFTs are measured to establish a simulation model to demonstrate the feasibility of the proposed circuit. Simulation results demonstrate that the relative mini-LED current error rates are below 9% when the VTH varies ± 0.3 V and VSS rises by 1 V. With respect to precise control of the gray level, the time shifts of current pulses are within 11.48 us over the whole grayscale. The improvement in the power consumption of the proposed circuit is more than 21% than that of a circuit that is driven by pulse amplitude modulation.

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Section: Introductionmentioning

confidence: 99%

AM PWM Driving Circuit for Mini-LED Backlight in Liquid Crystal Displays

Lin

Chen

Deng

et al. 2021

IEEE J. Electron Devices Soc.

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“…Oxide thin-film transistors (TFTs) have been used as backplanes for OLED displays and are different from the amorphous-silicon (a-Si) TFTs commonly used for LCDs [8]- [12]. Because the mobilities of oxide TFTs are 8 to 10 times higher than those of a-Si TFTs, the integrated circuits in OLEDs tend to be smaller.…”

Section: Introductionmentioning

confidence: 99%

Decreased Motion Blur in Large-Size, Organic, Light-Emitting Device Panels Due to Integrated Gate Driver Circuits With a Moving-Picture Response-Time-Reduction Method

Shin¹,

Kim

2020

IEEE J. Electron Devices Soc.

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The motion blur of a large-size, organic, light-emitting device (OLED) panel could be reduced by decreasing the moving-picture response time (MPRT). The MPRT of an OLED display panel with a fast response was significantly affected by the frame frequency and the compensation driving method, and the MPRTs of large-size OLED display panels could be significantly decreased by using an integrated gate driver circuit with a MPRT reduction method. The MPRT was decreased due to the ability to turn the emitting pixels off in advance, which was possible due to the provision of black data. The integrated gate drivers were designed so that a normal display, black data insertion, and operation in the compensation mode could be achieved. The MPRT of a 65-inch ultra-high-definition (UHD) OLED panel was decreased to 3.4 ms by using an integrated gate driver circuit. The MPRT reduction method proposed in this study can reduce the MPRT time to below 6.8 ms according to the black data insertion duty. This MPRT time of 6.8 ms can be further reduced to 3.4 ms in 50% black data duty, showing a 50% MPRT improvement. Thus, the motion blur of such large-size OLED display panels can be significantly reduced by decreasing the value of the MPRT. INDEX TERMS Motion blur, large-size organic light-emitting device, moving picture response time, integrated gate driver.

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“…It is well known that this problem stems from the uncertainty of threshold voltage of massproduced Thin Film Transistors (TFTs) that are used in an OLED driver circuit. To address this issue, many techniques have been reported to improve the uniformity by active compensation circuits [1,2]. Conceptually, the compensation process consists of (1) measuring the nonuniformity of the pixel current and (2) applying appropriate voltage or current adjustment in the OLED pixel driver.…”

Section: Introductionmentioning

confidence: 99%

A switching threshold programmable high-linearity transimpedance amplifier for OLED pixel current mismatch measurement

Jung

Kim

2020

Journal of Information Display

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In this paper, we present a new switching threshold programmable transimpedance amplifier (TIA) for OLED pixel current measurement system. The TIA is composed of an inverter-based cascode amplifier that achieves DC gain of 87 dB for high linearity. To maximize the current efficiency, novel biasing scheme using series capacitor between two input transconductors is proposed so that the current efficiency of NMOS and PMOS transistors are individually maximized. In order to correct random source voltage variation, the switching threshold range is adjustable with 4-bit resolution implemented in 180 nm CMOS technology, the prototype TIA achieves 4% of current-to-voltage conversion linearity error and 23 mV of switching threshold adjustment range. The implemented differential TIA consumes 165 μW under 3.3 V when operating at 5.2 kHz.

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UHD AMOLED Driving Scheme of Compensation Pixel and Gate Driver Circuits Achieving High-Speed Operation

Cited by 24 publications

References 15 publications

AM PWM Driving Circuit for Mini-LED Backlight in Liquid Crystal Displays

AM PWM Driving Circuit for Mini-LED Backlight in Liquid Crystal Displays

Decreased Motion Blur in Large-Size, Organic, Light-Emitting Device Panels Due to Integrated Gate Driver Circuits With a Moving-Picture Response-Time-Reduction Method

A switching threshold programmable high-linearity transimpedance amplifier for OLED pixel current mismatch measurement

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