ELECTROCHROMIC DISPLAY ELEMENT AND DISPLAY DEVICE

• US 20140268284A1
• Filed: 01/29/2014
• Published: 09/18/2014
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Naijo, Yoshihisa, Yashiro, Tohru, Okada, Yoshinori, Hirano, Shigenobu, Fujimura, Koh, Tsuji, Kazuaki, Takahashi, Hiroyuki, Kim, Sukchan, Yutani, Keiichiroh, Sagisaka, Toshiya
• Granted Patent: US 9,069,222 B2
• Time in Patent Office: Days
• US Class Current: 359/270
• CPC Class Codes: G02F 1/1347 Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
• CPC Class Codes: G02F 1/1503 caused by oxidation-reduction reactions in organic liquid solutions, e.g. viologen solutions
• CPC Class Codes: G02F 1/153 Constructional details
• CPC Class Codes: G02F 1/155 Electrodes
• CPC Class Codes: G02F 1/163 Operation of electrochromic cells, e.g. electrodeposition cells; Circuit arrangements therefor
• CPC Class Codes: G02F 2001/1536 additional, e.g. protective, layer inside the cell
• CPC Class Codes: G02F 2001/1552 Inner electrode, e.g. the electrochromic layer being sandwiched between the inner electrode and the support substrate
• CPC Class Codes: G09G 2300/023 Display panel composed of stacked panels
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2310/063 Waveforms for resetting the whole screen at once
• CPC Class Codes: G09G 2320/0209 Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 3/38 using electrochromic devices
• CPC Class Codes: Y10T 29/49117 Conductor or circuit manufacturing

Abstract

Disclosed is an electrochromic display element, including a display substrate, an opposed substrate that is opposed to the display substrate, an opposed electrode being formed at a display-substrate-opposed side of the opposed substrate, a first display electrode and a first electrochromic layer being laminated at an opposed-substrate-opposed side of the display substrate, a single porous film being formed between the display substrate and the opposed substrate, a second display electrode and a second electrochromic layer being laminated at a display-substrate-opposed side of the porous film, a third display electrode and a third electrochromic layer being laminated at an opposed-substrate-opposed side of the porous film, and an electrolyte being present between the display substrate and the opposed substrate.

Claims

1. An electrochromic display element, comprising:

a display substrate;

an opposed substrate that is opposed to the display substrate;

an opposed electrode being formed at a display-substrate-opposed side of the opposed substrate;

a first display electrode and a first electrochromic layer being laminated at an opposed-substrate-opposed side of the display substrate;

a single porous film being formed between the display substrate and the opposed substrate;

a second display electrode and a second electrochromic layer being laminated at a display-substrate-opposed side of the porous film;

a third display electrode and a third electrochromic layer being laminated at an opposed-substrate-opposed side of the porous film; and

an electrolyte being present between the display substrate and the opposed substrate.

2. The electrochromic display element as claimed in claim 1, wherein each of the first electrochromic layer, the second electrochromic layer, and the third electrochromic layer includes a metal oxide particle that carries an electrochromic compound.

3. The electrochromic display element as claimed in claim 1, wherein the first display electrode, the second display electrode, and the third display electrode have regions that do not overlap with one another.

4. The electrochromic display element as claimed in claim 3, wherein the first display electrode is electrically connected to a first drawing part formed on the opposed substrate, the second display electrode is electrically connected to a second drawing part formed on the opposed substrate through an electrically conductive film formed on the display substrate, and the third display electrode is electrically connected to a third drawing part formed on the opposed substrate.

5. The electrochromic display element as claimed in claim 4, wherein the porous film is such that a pore is filled or a pore is not formed in a region where the second display electrode is electrically connected to the electrically conductive film and a region where the third display electrode is electrically connected to the third drawing part.

6. A display device, comprising the electrochromic display element as claimed in claim 1.