High-capacity DC-DC converters for active matrix OLED display

Lee, Seok; Yoon, Jayang; Kim, Jae-Hoon; Lee, Chang-Suck; Jung, Hae-Min; Lee, Jaeshin; Choi, Joongho

doi:10.1109/apccas.2010.5775053

Cited by 6 publications

(2 citation statements)

References 7 publications

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“…The bipolar input voltage required by the AMOLED of the microdisplay can be generated by a power manager unit composed of two parallel DC-DC converters [15], two DC-DC converters in cascade [14,[16][17][18][19], or a Single-Inductor Bipolar-Output (SIBO) switched converter topology [7,8,12,[20][21][22][23][24]. The first approach is typically used because it is easy to design and suitable for time-to-market [24].…”

Section: Introductionmentioning

confidence: 99%

A Novel Single-Inductor Bipolar-Output DC/DC Boost Converter for OLED Microdisplays

et al. 2021

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In this paper, a novel SIBO (Single-Inductor Bipolar-Output) DC/DC Boost converter is proposed to power OLED (Organic Light-Emitting Diode) microdisplays. The proposed topology merges a conventional SISO (Single-Inductor Single-Output) DC/DC Boost converter and a switched capacitor inverter to produce a SIBO converter without both the cross-regulation effect and the unbalanced output voltages. Moreover, its control circuit and efficiency are almost the same as the conventional SISO Boost converter. Therefore, the novel converter maintains the power density, the small form factor, and the high efficiency of its conventional counterpart. The proposed converter was analyzed under continuous-conduction mode operation using the moving average operator and charge conservation principle. As a result, the authors proposed an equation set with the main averages and ripples of the circuit variables expressed as analytical functions of the circuit components, the input voltage, and the duty cycle. Both the functionality of the proposed converter and the accuracy of the developed equation set were analyzed by extensive simulations. The simulation performed using ideal components was characterized by a mean absolute percentage error of 0.774% with a standard deviation of 1.566%. These results confirm the high accuracy of the proposed equation set. Furthermore, the non-ideal model simulation confirms the functionality of the proposed converter in “real” operation conditions. Under simulation with non-ideal components, the result statistics were a mean absolute percentage error of 7.36% with a standard deviation of 6.91%. Therefore, the converter design using the proposed ideal model could be a good start point of a converter optimization process based on more complex component models and assisted by computer-aided design tools.

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Section: Introductionmentioning

confidence: 99%

A Novel Single-Inductor Bipolar-Output DC/DC Boost Converter for OLED Microdisplays

et al. 2021

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“…Thus, an ultra-clean V OP with a small voltage ripple, fast transient response, and excellent line/load regulation is necessary. To generate multiple rails, [2] and [3] integrated two separate DC-DC converters, one boost converter and one inverting flyback converter, on a single chip to provide V OP , and V ON . With even one more boost converter, [4] provides V OP , V ON and AV DD .…”

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confidence: 99%

A Hybrid Single-Inductor Bipolar Triple-Output DC–DC Converter With High-Quality Positive Outputs for AMOLED Displays

Mao

Lü

Maloberti

et al. 2023

IEEE Trans. Circuits Syst. I

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This paper presents a hybrid single-inductor bipolar triple-output (SIBTO) DC-DC converter for active-matrix organic light-emitting diode (AMOLED) displays. Generating the bipolar rails V OP and V ON for the pixel array and the analog rail AV DD for the source driver with a single inductor greatly reduces the system size and cost. This work adopts the floating negative output topology for an ultra-clean positive output. In addition, we propose a push-pull charge balancer to compensate and regulate the V OP , improving the line and load regulation with continuous currents and acceptable power consumption. This work also proposed a slow-comparator based ordered power distributive control (SC-OPDC) to regulate the AV DD with a pulse-skipping scheme to reduce the power loss. The designed power transistor buffers with adaptive deadtime control improve power conversion efficiency and decrease the required minimum load current of AV DD . The proposed SIBTO converter, implemented in 0.18-µm BCD process, operates at 1.67 MHz. It achieves a peak efficiency of 94.1% at 0.88 W output and a maximum output power of 3.67 W with an efficiency of 87%. The maximum output voltage ripples are 5 mV, 17 mV, and 7.5 mV for V OP , V ON , and AV DD , respectively.

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A Power-Efficient Hybrid Single-Inductor Bipolar-Output DC-DC Converter with Floating Negative Output for AMOLED Displays

Mao

Lü

Bonizzoni

et al. 2020

2020 IEEE Custom Integrated Circuits Conference (CICC)

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High-capacity DC-DC converters for active matrix OLED display

Cited by 6 publications

References 7 publications

A Novel Single-Inductor Bipolar-Output DC/DC Boost Converter for OLED Microdisplays

A Novel Single-Inductor Bipolar-Output DC/DC Boost Converter for OLED Microdisplays

A Hybrid Single-Inductor Bipolar Triple-Output DC–DC Converter With High-Quality Positive Outputs for AMOLED Displays

A Power-Efficient Hybrid Single-Inductor Bipolar-Output DC-DC Converter with Floating Negative Output for AMOLED Displays

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