Electrochromic display device
View Patent ↗Disclosed is an electrochromic display device, including, a first substrate, first electrodes provided on an upper surface of the first substrate, a second substrate provided to be opposed to the first substrate above the first substrate, the second substrate being formed of a transparent material, second electrodes provided on an undersurface of the second substrate, at least a part of the second electrodes being formed of a transparent electrode material, and an electrochromic composition layer provided between the first substrate and the second substrate. The electrochromic composition layer contains an electrochromic composition including a supporting electrolyte, a polar solvent, a leuco dye, a hydroquinone derivative and/or a catechol derivative, a ferrocene derivative, and a compound having a carbonyl group.
1. An electrochromic display device, comprising:
a first substrate;
a first electrode provided on an upper surface of the first substrate;
a second substrate provided to be opposed to the first substrate above the first substrate, the second substrate being formed of a transparent material;
a second electrode provided on an undersurface of the second substrate, at least a part of the second electrode being formed of a transparent electrode material; and
an electrochromic composition layer provided between the first substrate and the second substrate, the electrochromic composition layer containing an electrochromic composition including a supporting electrolyte, a polar solvent, a leuco dye, a hydroquinone derivative and/or a catechol derivative, a ferrocene derivative, and a compound having a carbonyl group.
2. The electrochromic display device according to claim 1 , wherein
the compound having the carbonyl group is at least one member selected from the group consisting of an acetophenone derivative, a dibenzoyl derivative, and a β-diketone compound.
3. The electrochromic display device according to claim 2 , wherein
the β-diketone compound is at least one member selected from the group consisting of an acetylacetone derivative, a cyclohexanone derivative, a cyclohexane dione derivative, and a benzoylacetone derivative.
4. The electrochromic display device according to claim 1 , wherein
the polar solvent is at least one kind of an organic solvent having a property of passing a current by using the supporting electrolyte.
5. The electrochromic display device according to claim 1 , wherein
the electrochromic display device shows a display on the electrochromic display device by applying a first current between the first electrode and the second electrode, and erases the display by applying a second current between the first electrode and the second electrode in a direction opposite to a direction of the first current, and
an aluminum oxide and/or an aluminum hydroxide to absorb the leuco dye at a time of applying the second current is added to the electrochromic composition.
6. The electrochromic display device according to claim 1 , further comprising an absorption layer containing an aluminum oxide and/or an aluminum hydroxide, the absorption layer being provided between the first electrode and the electrochromic composition layer, wherein
the electrochromic display device shows a display on the electrochromic display device by applying a first current between the first electrode and the second electrode, and erases the display by applying a second current between the first electrode and the second electrode in a direction opposite to a direction of the first current, and
the absorption layer absorbs the leuco dye at a time of applying the second current.
7. The electrochromic display device according to claim 1 , wherein
the supporting electrolyte is a compound represented by a following general formula (1) and/or a compound represented by a following general formula (2):
M 1 X 1 (1)
wherein M 1 is selected from Li, Na, K, Rb, Cs and NH 4 ;
X 1 is selected from ClO 4 , BF 4 , CF 3 SO 3 , or PF 6 :
(R a ) n (R b ) m NX 2 (2)
wherein R a is selected from an alkyl group and an aryl group;
Rb denotes an alkyl group;
N denotes a nitrogen atom;
X 2 is selected from Cl, Br, I, ClO 4 , BF 4 , CF 3 SO 3 , and PF 6 ;
n denotes an integer of 0 to 2;
m denotes 4-n.
8. The electrochromic display device according to claim 1 , wherein
a polymer compound is added to the electrochromic composition.
9. The electrochromic display device according to claim 1 , wherein
the first electrode is one of a plurality of electrodes extending in parallel with each other;
the second electrode is one of transparent display electrodes composed of a plurality of transparent electrodes extending in parallel with each other in a direction perpendicular to a direction of the first electrode; and
pixels are formed at regions where the first electrode and the second electrode three-dimensionally intersect with each other.
10. The electrochromic display device according to claim 1 , wherein the electrochromic composition has fluidity.
11. The electrochromic display device according to claim 1 , wherein the electrochromic composition layer comprises a porous body that includes pores, and that holds the electrochromic composition between the first substrate and the second substrate.
12. The electrochromic display device according to claim 11 , wherein the electrochromic composition is introduced into the pores.
13. The electrochromic display device according to claim 11 , wherein the pores pierce the porous body in a direction substantially perpendicular to the first substrate and the second substrate.