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Low-Power Driving Technique for 1-Pixel Display Using an External Capacitor
Hiroyuki MANABE Munekazu DATE Hideaki TAKADA Hiroshi INAMURA
IEICE TRANSACTIONS on Electronics
Publication Date: 2015/11/01
Online ISSN: 1745-1353
Type of Manuscript: INVITED PAPER (Special Section on Electronic Displays)
LCD, PDLC, 1-pixel, low power, capacitor,
Full Text: FreePDF
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.