Low-power driving technique for 1-pixel display using an external capacitor

Hiroyuki Manabe, Munekazu Date, Hideaki Takada, Hiroshi Inamura

Research output: Contribution to journalArticle

1 Citation (Scopus)

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 × 10 mm2 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.

Original languageEnglish
Pages (from-to)1015-1022
Number of pages8
JournalIEICE Transactions on Electronics
VolumeE98C
Issue number11
DOIs
Publication statusPublished - 2015 Nov 1
Externally publishedYes

Fingerprint

Liquid crystal displays
Capacitors
Pixels
Display devices
Ubiquitous computing
Electric power utilization
Capacitance
Controllers
Experiments

Keywords

  • 1-pixel
  • Capacitor
  • LCD
  • Low power
  • PDLC

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

Low-power driving technique for 1-pixel display using an external capacitor. / Manabe, Hiroyuki; Date, Munekazu; Takada, Hideaki; Inamura, Hiroshi.

In: IEICE Transactions on Electronics, Vol. E98C, No. 11, 01.11.2015, p. 1015-1022.

Research output: Contribution to journalArticle

Manabe, Hiroyuki ; Date, Munekazu ; Takada, Hideaki ; Inamura, Hiroshi. / Low-power driving technique for 1-pixel display using an external capacitor. In: IEICE Transactions on Electronics. 2015 ; Vol. E98C, No. 11. pp. 1015-1022.
@article{f729409279784509b81760ba888756e1,
title = "Low-power driving technique for 1-pixel display using an external capacitor",
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 × 10 mm2 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 = "1-pixel, Capacitor, LCD, Low power, PDLC",
author = "Hiroyuki Manabe and Munekazu Date and Hideaki Takada and Hiroshi Inamura",
year = "2015",
month = "11",
day = "1",
doi = "10.1587/transele.E98.C.1015",
language = "English",
volume = "E98C",
pages = "1015--1022",
journal = "IEICE Transactions on Electronics",
issn = "0916-8524",
publisher = "Maruzen Co., Ltd/Maruzen Kabushikikaisha",
number = "11",

}

TY - JOUR

T1 - Low-power driving technique for 1-pixel display using an external capacitor

AU - Manabe, Hiroyuki

AU - Date, Munekazu

AU - Takada, Hideaki

AU - Inamura, Hiroshi

PY - 2015/11/1

Y1 - 2015/11/1

N2 - 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 × 10 mm2 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.

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 × 10 mm2 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.

KW - 1-pixel

KW - Capacitor

KW - LCD

KW - Low power

KW - PDLC

UR - http://www.scopus.com/inward/record.url?scp=84947919076&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84947919076&partnerID=8YFLogxK

U2 - 10.1587/transele.E98.C.1015

DO - 10.1587/transele.E98.C.1015

M3 - Article

AN - SCOPUS:84947919076

VL - E98C

SP - 1015

EP - 1022

JO - IEICE Transactions on Electronics

JF - IEICE Transactions on Electronics

SN - 0916-8524

IS - 11

ER -