ELECTROCHROMIC DISPLAY ELEMENT

• Main Authors: HOSHINO KATSUYOSHI, SAKABE ICHIRO, MURAKI KATSUYUKI, OIKAWA YOSUKE, KOMATSU TOSHIKI
• Format: Patent
• Language: English
• Published: 24.09.2010
• Subjects: ADVERTISING; CRYPTOGRAPHY; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DISPLAY; DISPLAYING; EDUCATION; FREQUENCY-CHANGING; LABELS OR NAME-PLATES; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; SEALS; SIGNS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

PROBLEM TO BE SOLVED: To provide an electrochromic display element which allows uniform oxidation-reduction reaction with a simple configuration without using a light scattering material together and without processing an electrode surface. SOLUTION: The electrochromic display element includes a pair of electrodes and a medium layer interposed between the pair of electrodes, and at least one of the pair of electrodes is a transparent electrode, and the medium layer contains a specific viologen compound, a specific support electrolyte, and a solvent. When a voltage is applied between the electrodes, (1) a region which is colored by deposition of a coloring matter on the transparent electrode and a region which is decolored by dissolution of the coloring matter are in a range of ≥-1.0 and <1.0 V with respect to a saturated calomel electrode, and (2) a region wherein a white layer is formed by deposition of crystal on the transparent electrode is in a range of ≥1.0 V with respect to the saturated calomel electrode. COPYRIGHT: (C)2010,JPO&INPIT