Reducing Power Consumption of Active-Matrix Mini-LED Backlit LCDs by Driving Circuit

Deng, Ming-Yang; Hsiang, En‐Lin; Yang, Qian; Tsai, Cheng-Han; Chen, Bo-Shu; Wu, Chia-En; Lee, Ming‐Hsien; Wu, Shin‐Tson; Lin, Chih-Lung

doi:10.1109/ted.2021.3067860

Cited by 27 publications

(19 citation statements)

References 24 publications

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“…(PCB) AM driving can eliminate the need for a large number of ICs. However, due to the low transmittance of LCD, the current of Mini-LED must be increased to several milli-Ampere (mA) to display the required brightness of the image [17]. In that case, power consumption in the power source lines will also increase.…”

Section: Figurementioning

confidence: 99%

“…Local dimming technology can greatly reduce LCD power consumption compared to the normal global backlight. However, considering the Mini-LED energy loss [54] and chip driving [9,17], the overall power consumption of the Mini-LED local dimming system still has room for optimization. The power consumption of the dimming system is affected by various factors such as panel size, display image content and brightness, and backlight efficiency.…”

Section: Mini-led Backlight Evaluation Parametersmentioning

confidence: 99%

“…Mini-LED BLUs are usually driven by an active matrix (AM) or passive matrix (PM). Compared to PM driving, AM driving saves on the number of source ICs and reduces the size and complexity of the PCB [17]. It can also increase the resolution of the backlight module [56], thus being a better driving option.…”

Section: Various Solutions For Reducing Backlight Consumption Design ...mentioning

confidence: 99%

“…The circuit can also compensate for variations in the V TH of TFTs and the VSS power line, providing highly uniform drive current for Mini-LED backlight. These two schemes are ideal driving schemes [17].…”

Section: Various Solutions For Reducing Backlight Consumption Design ...mentioning

confidence: 99%

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Mini-LED Backlight Technology Progress for Liquid Crystal Display

et al. 2022

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As consumers pursue higher display quality, Mini-LED backlight technology has become the focus of research in the current display field. With its size advantage (100–200 μm), it can achieve one-thousand-level divisional dimming, and it can also be combined with quantum dot technology to greatly improve the contrast, color gamut, dark state and other element of the display performance of LCD displays. Mini-LED backlight technology is undoubtedly the most ideal solution to realize a highly dynamic range display of LCD displays, and has been widely commercialized in many fields such as TVs, tablet computers, notebook computers, and car monitors. This review mainly introduces the efforts made by researchers to eliminate the halo effect, thinning of the backlight module and reducing the backlight power consumption. The application of quantum dot technology in backlight is also presented. We predict that the number of Mini-LED backlight partitions is expected to reach a level of more than 3000 in the future, further utilizing the advantages of the small size in local dimming, but it will also inevitably be challenged by some issues such as power consumption and heat dissipation.

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Section: Figurementioning

confidence: 99%

Section: Mini-led Backlight Evaluation Parametersmentioning

confidence: 99%

Section: Various Solutions For Reducing Backlight Consumption Design ...mentioning

confidence: 99%

Section: Various Solutions For Reducing Backlight Consumption Design ...mentioning

confidence: 99%

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Mini-LED Backlight Technology Progress for Liquid Crystal Display

et al. 2022

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“…However, the VTH variation of the TFT causes the generated driving currents in the pixels to be non-uniform. To solve the V TH variation, several circuits with different compensating mechanisms have been reported [16]- [20]. Shin et al [19] employed a diode-connected structure to compensate for the V TH variation of the driving TFT, reducing the deviation in the emission current.…”

Section: Introductionmentioning

confidence: 99%

AM Mini-LED Backlight Driving Circuit Using PWM Method With Power-Saving Mechanism

Lin

Chen

Chang

et al. 2022

IEEE J. Electron Devices Soc.

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This paper proposes a mini-light-emitting diode (mini-LED) driving circuit that is driven by pulse width modulation (PWM) for the backlights of active-matrix (AM) liquid crystal displays (LCDs). The proposed circuit compensates for threshold voltage (VTH) variations of low-temperature polycrystalline silicon thin-film transistors (LTPS TFTs) and the current-resistance (I-R) rise in VSS lines to supply a stable driving current. Operating the mini-LED at the high luminous efficacy by the PWM driving method and setting only the driving TFT on the path of the driving current reduce the power consumption of the backlight. Based on a 2.89-inch LCD panel with an AMLED 48 × 48 backlit module, the TFTs are fabricated, measured, and fitted. Simulation results show that the relative current error rates are all below 4.67% when the VTH of the driving TFT varies by ±0.3 V and the VSS rises by 0.5 V. The voltage across VDD and VSS of the proposed circuit is 4.5 V lower than that of the 6T1C compensating driving circuit, so the power consumption of the circuit is at least 27.05% lower. Therefore, the proposed driving circuit is well suitable to use in mini-LED backlit LCDs.

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11.2: Invited Paper: Three‐sided Borderless Low IR Drop Mini‐LED Display Based on High Mobility Oxide TFT

Zhou

2021

Symp Digest of Tech Papers

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In this paper, we introduce a Mini‐LED display based on high mobility oxide thin film transistor (TFT) panel. The Mini‐LED display panel has a 160 × 160RGB pixel array with a pixel pitch of 0.6mm A new power line structure is adopted to minimize the IR drop of power line to achieve a uniform display. In this Mini‐LED display panel, a high mobility Ln‐IZO TFT is used, which helps to reduce the power of Mini‐LED panel. Both gate IC, source IC and fanout lines are placed at the top of the display, and a three‐sided borderless Mini‐LED display can be realized after laser cutting. Then 2×N display can be spliced by this 160×160RGB three‐sided borderless panel, such as 320×480 RGB(2×3 spliced). At last, a PWM driving method is introduced, which can achieve a better grayscale display.

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Reducing Power Consumption of Active-Matrix Mini-LED Backlit LCDs by Driving Circuit

Cited by 27 publications

References 24 publications

Mini-LED Backlight Technology Progress for Liquid Crystal Display

Mini-LED Backlight Technology Progress for Liquid Crystal Display

AM Mini-LED Backlight Driving Circuit Using PWM Method With Power-Saving Mechanism

11.2: Invited Paper: Three‐sided Borderless Low IR Drop Mini‐LED Display Based on High Mobility Oxide TFT

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