Area-Efficient Time-Shared Digital-to-Analog Converter With Dual Sampling for AMOLED Column Driver IC’s

An, Tai-Ji; Hwang, Moon-Sang; Choe, Wonyoung; Ahn, Gil-Cho; Lee, Seung‐Hoon

doi:10.1109/tcsi.2018.2822313

Cited by 11 publications

(4 citation statements)

References 21 publications

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“…The R and C panel loads driven by a buffer amplifier are ever increasing with the advancement of FPD technology, whereas the constraint on settling time is becoming tighter. A column driver for a large FPD typically requires receiver comparators, data registers, and shift registers, which are composed of low-voltage transistors, gamma reference voltages and digital-toanalog converters (DACs), which are composed of middle-voltage transistors, level shifters and output buffers with output-polarity switches, which are composed of high-voltage transistors [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Recently, the column driver may include a delay-locked loop (DLL) or phase-locked loop (PLL) for high-frequency operation, analog-to-digital converters (ADCs) for compensating the organic light-emitting diode (OLED) display degradation, and a temperature sensor for monitoring the ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the column driver may include a delay-locked loop (DLL) or phase-locked loop (PLL) for high-frequency operation, analog-to-digital converters (ADCs) for compensating the organic light-emitting diode (OLED) display degradation, and a temperature sensor for monitoring the ambient temperature. The driver sub-system can use either an analog [1][2][3][4][5][6][7][8][9][10][11][12]14] or a digital [13] approach as its driving scheme. The thin-film transistor liquid-crystal displays (TFT-LCDs) adopt inversion driving methods (column, frame, line, dot, and 2-dot inversions) to alternate the polarities of liquid crystal (LC) cells in regard to common electrode voltage (V COM ).…”

Section: Introductionmentioning

confidence: 99%

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High-Speed Column Driver IC Having Buffer Amplifier with Embedded Isolation Switch and Compact Adaptive Biasing for Flat-Panel Displays

Kim

Kong

2021

Electronics

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A high-speed column driver IC with an area-efficient high-slew-rate buffer amplifier is proposed for use in a large-sized, high-resolution TFT-LCD panel application. In the proposed architecture, explicit isolation switches have been embedded into the buffer amplifier resulting in a fast settling response. The amplifier also has a structure that adjusts the tail current of the input stage using a very compact adaptive biasing. The proposed column driver IC, having the proposed buffer amplifier for driving a 55-inch 4K ultra-high-definition (UHD) TV panel, was fabricated in a 0.18-μm 1.8-V low-voltage, 1.2-μm 9-V medium-voltage, and 1.6-μm 18-V high-voltage CMOS process. The performance evaluation results indicated that 90% and 99.9% falling settling times were improved from 1.947 µs to 0.710 µs (63.5% improvement) and 4.131 µs to 2.406 µs (41.7% improvement), respectively. They also indicated that the layout size of the proposed buffer amplifier was reduced from 5580 μm2 to 4402 μm2 (21.1% reduction).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-Speed Column Driver IC Having Buffer Amplifier with Embedded Isolation Switch and Compact Adaptive Biasing for Flat-Panel Displays

Kim

Kong

2021

Electronics

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“…DACs play a key role in data voltage generation in the column driver and they usually occupy a large part of the chip area in the driver IC. For example, in a 6-bit driver IC, the DACs occupies more than 30% of the die area [6]. Consequently, area compactness becomes one of the most stringent requirements for DACs [7].…”

Section: Introductionmentioning

confidence: 99%

An Area-Efficient 10-Bit Buffer-Reused DAC for AMOLED Column Driver ICs

et al. 2020

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In this paper, we proposed an area-efficient 10-bit digital-to-analog converter (DAC) with buffer-reusing method to dramatically relief the severe area exploding issue in high-definition active-matrix organic light-emitting diode (AMOLED) driver integrated circuits (ICs). In our design, we implement the functionalities of a large number of switches and capacitors in conventional DAC by a compact internal buffer. Furthermore, we minimize the buffer capacity requirement by elaborately reusing the indispensable output buffer in the typical column driver. In this way, we can cut down nearly a half of the decoder-switches and simultaneously reduce the capacitor size from 8 C to 3 C without designing an intricate and power-consuming amplifier separately. A prototype 6-channel column driver employing the proposed buffer-reused DAC was fabricated by 0.35 μm 2P3M BCD (Bipolar, CMOS, DMOS) process and its effective layout area per channel is 0.0429 mm2, which is 42.8% smaller than that of the conventional 10-bit R-C DAC. Besides, the measured differential nonlinearity (DNL) and integral nonlinearity (INL) are 0.514 LSB/0.631 LSB, respectively and the maximum value of inter-channel deviation voltage output (DVO) is 3.25 mV. The settling time within 5.6 μs is readily achieved under 1.5 kΩ-resistance and 100 pF-capacitance load. Measurement results indicate that the proposed buffer-reused DAC can successfully minimize the die area while maintaining other required performances.

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“…As display panels need to be larger and have higher resolution, the column drivers of an LCD driving system are becoming important to drive more efficiently large resistive and capacitive loads with low-power dissipation, small area and fast settling time. A column driver of a FPD panel generally includes shift registers, input registers, data latches, level shifters, digital-to-analog converters (DACs) and output buffers with output switches [1][2][3][4][5][6][7][8][9][10]. FPD driving systems generally use analog [11][12][13][14][15][16][17][18][19] or digital driving methods [20,21].…”

Section: Introductionmentioning

confidence: 99%

High-Speed Rail-to-Rail Class-AB Buffer Amplifier with Compact, Adaptive Biasing for FPD Applications

Kong

2020

Electronics

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A high-slew-rate, low-power, CMOS, rail-to-rail buffer amplifier for large flat-panel-display (FPD) applications is proposed. The major circuit of the output buffer is a rail-to-rail, folded-cascode, class-AB amplifier which can control the tail current source using a compact, novel, adaptive biasing scheme. The proposed output buffer amplifier enhances the slew rate throughout the entire rail-to-rail input signal range. To obtain a high slew rate and low power consumption without increasing the static current, the tail current source of the adaptive biasing generates extra current during the transition time of the output buffer amplifier. A column driver IC incorporating the proposed buffer amplifier was fabricated in a 1.6-μm 18-V CMOS technology, whose evaluation results indicated that the static current was reduced by up to 39.2% when providing an identical settling time. The proposed amplifier also achieved up to 49.1% (90% falling) and 19.9 % (99.9% falling) improvements in terms of settling time for almost the same static current drawn and active area occupied.

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Area-Efficient Time-Shared Digital-to-Analog Converter With Dual Sampling for AMOLED Column Driver IC’s

Cited by 11 publications

References 21 publications

High-Speed Column Driver IC Having Buffer Amplifier with Embedded Isolation Switch and Compact Adaptive Biasing for Flat-Panel Displays

High-Speed Column Driver IC Having Buffer Amplifier with Embedded Isolation Switch and Compact Adaptive Biasing for Flat-Panel Displays

An Area-Efficient 10-Bit Buffer-Reused DAC for AMOLED Column Driver ICs

High-Speed Rail-to-Rail Class-AB Buffer Amplifier with Compact, Adaptive Biasing for FPD Applications

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