TRANSPARENT DISPLAY DEVICE

• US 20170192334A1
• Filed: 11/28/2016
• Published: 07/06/2017
• Est. Priority Date: 12/31/2015
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: AN, Hyun Jin, KIM, Jong Moo, JUNG, Jin Hyun
• Granted Patent: US 9,977,307 B2
• Time in Patent Office: Days
• CPC Class Codes: C07D 213/22 containing two or more pyridine rings directly linked together, e.g. bipyridyl
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/1044 containing two nitrogen atoms as heteroatoms
• CPC Class Codes: G02F 1/15 based on an electrochromic effect
• CPC Class Codes: G02F 1/1516 comprising organic material
• CPC Class Codes: G02F 1/155 Electrodes
• CPC Class Codes: G02F 1/161 Gaskets; Spacers; Sealing of cells; Filling or closing of cells
• CPC Class Codes: G02F 1/163 Operation of electrochromic cells, e.g. electrodeposition cells; Circuit arrangements therefor
• CPC Class Codes: G02F 2001/1635 the pixel comprises active switching elements, e.g. TFT
• CPC Class Codes: G02F 2203/01 transmissive
• CPC Class Codes: G09G 3/34 by control of light from an independent source
• CPC Class Codes: G09G 3/38 using electrochromic devices

Abstract

Disclosed is a transparent display device including an electrochromic element. The electrochromic element includes an electrochromic layer, a counter layer, and an electrolyte layer. An image is displayed through an oxidation-reduction reaction, and the display device is in a transparent mode when a voltage is not applied. The electrochromic layer and the counter layer may further include a core material for changing a color at a high speed.

Claims

1. A transparent display device comprising:

a first substrate and a second substrate facing each other;

a thin film transistor (TFT) disposed on one surface of the first substrate;

a first transparent electrode connected to the TFT;

a second transparent electrode disposed on the second substrate to face the first substrate; and

an electrochromic element provided between the first transparent electrode and the second transparent electrode.

2. The transparent display device of claim 1, wherein

the TFT comprises a source electrode and a passivation layer disposed on the source electrode, and

the source electrode transfers an electrical signal to the first transparent electrode through a contact hole included in the passivation layer.

3. The transparent display device of claim 1, wherein the electrochromic element comprises:

an electrochromic layer provided on the first transparent electrode;

a counter layer provided on the second transparent electrode to face the first substrate; and

an electrolyte layer disposed between the electrochromic layer and the counter layer.

4. The transparent display device of claim 3, wherein the electrochromic layer comprises one of a material emitting red light, a material emitting green light, and a material emitting blue light.

5. The transparent display device of claim 4, wherein the electrochromic layer comprises a compound represented by Formula 1:

6. The transparent display device of claim 5, wherein the hydrocarbon is substituted by a group selected from aryl groups, halogen, nitrogen, oxygen, alcohols, esters, ammonium salts, or phosphonium salts.

7. The transparent display device of claim 4, wherein the electrochromic layer comprises a compound represented by Formula 2:

8. The transparent display device of claim 4, wherein the electrochromic layer comprises a compound represented by Formula 3:

9. The transparent display device of claim 4, wherein the electrochromic layer comprises a compound represented by Formula 4:

10. The transparent display device of claim 3, wherein

the electrochromic layer is oxidized, and the counter layer is reduced to produce a color.

11. The transparent display device of claim 3, wherein

the electrochromic layer is reduced to produce a color, and the counter layer is oxidized.

12. The transparent display device of claim 4, wherein the counter layer comprises a compound represented by Formula 5:

13. The transparent display device of claim 12, wherein the hydrocarbon is substituted by a group selected from aryl groups, halogens, nitrogen, oxygen, alcohols, esters, ammonium salts, or phosphonium salts.

14. The transparent display device of claim 3, further comprising a separation wall dividing a red pixel area, a green pixel area, and a blue pixel area.

15. The transparent display device of claim 3, wherein

when a voltage is not applied, the transparent display device has a transmittance of about 70% to about 90%.

16. The transparent display device of claim 3, wherein

when a voltage is not applied, the transparent display device has an image color change speed of 100 msec or less.