A Memory-in-Pixel Circuit for Low-Power Liquid Crystal Displays With Low Temperature Poly-Silicon and Oxide Thin Film Transistors

Kim, Jongbin; Chung, Hongsuk; Lee, Seung-Woo

doi:10.1109/led.2019.2950163

Cited by 15 publications

(10 citation statements)

References 13 publications

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“…Some researchers have reported a hybrid pixel circuit of LTPS and oxide TFT (IGZO) to overcome this problem. [3][4][5][6][7][8][9][10][11] In our previous work, we reported our hybrid technology. 12 Figure 1A shows our proposed pixel circuit.…”

Section: Introductionmentioning

confidence: 99%

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Reliability improvement of IGZO‐TFT in hybrid process with LTPS

et al. 2021

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An AMOLED panel using hybrid backplane technology based on p-type low temperature polycrystalline silicon (p-LTPS) and n-type indium-galliumzinc-oxide (n-IGZO) thin-film transistors (TFTs) has been successfully manufactured. New pixel and Gate-on-Array (GOA) circuits were designed and fabricated using this technology. GOA with CMOS inverter is realized by utilizing both IGZO and p-LTPS. The hybrid backplane AMOLED panel can operate between 1 and 120 Hz, which enables both high refresh rate and low standby power display applications. Furthermore, the AMOLED panel lifetime has markedly enhanced by improving IGZO TFT's uniformity and reliability.

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Section: Introductionmentioning

confidence: 99%

“…However, using only p‐LTPS pixel circuit, it is difficult to realize low refresh rate driving due to high off leakage current of p‐LTPS. Some researchers have reported a hybrid pixel circuit of LTPS and oxide TFT (IGZO) to overcome this problem 3–11 . In our previous work, we reported our hybrid technology 12 .…”

Section: Introductionmentioning

confidence: 99%

Reliability improvement of IGZO‐TFT in hybrid process with LTPS

et al. 2021

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“…Thus, when we display a horizontal line pattern driven by the column inversion and a full white pattern driven by the dot inversion, both LCDs consume the highest power. Thus, the dynamic power consumption of these two cases were calculated as in [26]. The dynamic power of the conventional LCD (P Dyn , C ) for a full white pattern based on the dot inversion is expressed as…”

Section: Discussionmentioning

confidence: 99%

A Low-Power Memory-in-Pixel Circuit for Liquid Crystal Displays Comprising Low-Temperature Poly-Silicon and Oxide Thin-Film Transistors

Kim¹,

Lee²,

Chung³

et al. 2020

Electronics

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In this paper, a new pixel structure using low-temperature polycrystalline silicon and oxide (LTPO) thin-film transistors (TFTs) for low-power liquid crystal displays (LCDs) is proposed. The extremely low off-state current of oxide semiconductor TFTs enables the proposed circuit to operate at a very low frame frequency of 1/60 Hz, so that the power consumption can be significantly reduced. In addition, the low-temperature polycrystalline silicon TFTs with high reliability directly drive pixels, which can achieve stable and flicker-free LCDs. The proposed circuit is fabricated using the LTPO TFT backplane and successfully verified by simulation and measurement results. The measurement results prove that the proposed circuit operates well without further programming for 60 s, and the power consumption in the panel (except backlight power) can be reduced to 0.02% of that of conventional LCD.

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“…Beside, using oxide and LTPS transistors in panel circuits for low power consumption display has been reported 6–12 . In this paper, we have proposed high refresh rate and low power consumption OLED panel, by simultaneously utilizing both p‐LTPS and n‐type indium–gallium–zinc–oxide (n‐IGZO).…”

Section: Introductionmentioning

confidence: 99%

High refresh rate and low power consumption AMOLED panel using top‐gate n‐oxide and p‐LTPS TFTs

et al. 2020

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A pixel circuit and a gate driver on array for light-emitting display are presented. By simultaneously utilizing top-gate n-type oxide and p-type lowtemperature polycrystalline silicon (LTPS) thin-film transistors (TFTs), the circuits provide high refresh rate and low power consumption. An active-matrix LED (AMOLED) panel with proposed circuits is fabricated, and driving at various refresh rate ranging from 1 to 120 Hz could be achieved.

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A Memory-in-Pixel Circuit for Low-Power Liquid Crystal Displays With Low Temperature Poly-Silicon and Oxide Thin Film Transistors

Cited by 15 publications

References 13 publications

Reliability improvement of IGZO‐TFT in hybrid process with LTPS

Reliability improvement of IGZO‐TFT in hybrid process with LTPS

A Low-Power Memory-in-Pixel Circuit for Liquid Crystal Displays Comprising Low-Temperature Poly-Silicon and Oxide Thin-Film Transistors

High refresh rate and low power consumption AMOLED panel using top‐gate n‐oxide and p‐LTPS TFTs

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