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Low-Power Driving Technique for 1-Pixel Display Using an External Capacitor
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Summary :
Liquid crystal displays (LCDs) are suitable as elements underlying wearable and ubiquitous computing thanks to their low power consumption. A technique that uses less power to drive 1-pixel LCDs is proposed. It harvests the charges on the LCD and stores them in an external capacitor for reuse when the polarity changes. A simulation shows that the charge reduction depends on the ratio of the capacitance of the external capacitor to that of the LCD and can reach 50%. An experiment on a prototype demonstrates an almost 30% reduction with large 1-pixel LCDs. With a small 10 × 10mm2 LCD, the overhead of the micro-controller matches the reduction so no improvement could be measured. Though the technique requires longer time for polarity reversal, we confirm that it does not significantly degrade visual quality.
- Publication
- IEICE TRANSACTIONS on Electronics Vol.E98-C No.11 pp.1015-1022
- Publication Date
- 2015/11/01
- Publicized
- Online ISSN
- 1745-1353
- DOI
- 10.1587/transele.E98.C.1015
- Type of Manuscript
- Special Section INVITED PAPER (Special Section on Electronic Displays)
- Category
Authors
Hiroyuki MANABE
NTT DOCOMO
Munekazu DATE
NTT Corporation
Hideaki TAKADA
NTT Corporation
Hiroshi INAMURA
NTT DOCOMO
Keyword
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Hiroyuki MANABE, Munekazu DATE, Hideaki TAKADA, Hiroshi INAMURA, "Low-Power Driving Technique for 1-Pixel Display Using an External Capacitor" in IEICE TRANSACTIONS on Electronics,
vol. E98-C, no. 11, pp. 1015-1022, November 2015, doi: 10.1587/transele.E98.C.1015.
Abstract: Liquid crystal displays (LCDs) are suitable as elements underlying wearable and ubiquitous computing thanks to their low power consumption. A technique that uses less power to drive 1-pixel LCDs is proposed. It harvests the charges on the LCD and stores them in an external capacitor for reuse when the polarity changes. A simulation shows that the charge reduction depends on the ratio of the capacitance of the external capacitor to that of the LCD and can reach 50%. An experiment on a prototype demonstrates an almost 30% reduction with large 1-pixel LCDs. With a small 10 × 10mm2 LCD, the overhead of the micro-controller matches the reduction so no improvement could be measured. Though the technique requires longer time for polarity reversal, we confirm that it does not significantly degrade visual quality.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/transele.E98.C.1015/_p
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@ARTICLE{e98-c_11_1015,
author={Hiroyuki MANABE, Munekazu DATE, Hideaki TAKADA, Hiroshi INAMURA, },
journal={IEICE TRANSACTIONS on Electronics},
title={Low-Power Driving Technique for 1-Pixel Display Using an External Capacitor},
year={2015},
volume={E98-C},
number={11},
pages={1015-1022},
abstract={Liquid crystal displays (LCDs) are suitable as elements underlying wearable and ubiquitous computing thanks to their low power consumption. A technique that uses less power to drive 1-pixel LCDs is proposed. It harvests the charges on the LCD and stores them in an external capacitor for reuse when the polarity changes. A simulation shows that the charge reduction depends on the ratio of the capacitance of the external capacitor to that of the LCD and can reach 50%. An experiment on a prototype demonstrates an almost 30% reduction with large 1-pixel LCDs. With a small 10 × 10mm2 LCD, the overhead of the micro-controller matches the reduction so no improvement could be measured. Though the technique requires longer time for polarity reversal, we confirm that it does not significantly degrade visual quality.},
keywords={},
doi={10.1587/transele.E98.C.1015},
ISSN={1745-1353},
month={November},}
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TY - JOUR
TI - Low-Power Driving Technique for 1-Pixel Display Using an External Capacitor
T2 - IEICE TRANSACTIONS on Electronics
SP - 1015
EP - 1022
AU - Hiroyuki MANABE
AU - Munekazu DATE
AU - Hideaki TAKADA
AU - Hiroshi INAMURA
PY - 2015
DO - 10.1587/transele.E98.C.1015
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E98-C
IS - 11
JA - IEICE TRANSACTIONS on Electronics
Y1 - November 2015
AB - Liquid crystal displays (LCDs) are suitable as elements underlying wearable and ubiquitous computing thanks to their low power consumption. A technique that uses less power to drive 1-pixel LCDs is proposed. It harvests the charges on the LCD and stores them in an external capacitor for reuse when the polarity changes. A simulation shows that the charge reduction depends on the ratio of the capacitance of the external capacitor to that of the LCD and can reach 50%. An experiment on a prototype demonstrates an almost 30% reduction with large 1-pixel LCDs. With a small 10 × 10mm2 LCD, the overhead of the micro-controller matches the reduction so no improvement could be measured. Though the technique requires longer time for polarity reversal, we confirm that it does not significantly degrade visual quality.
ER -
English
