Transparent display device and manufacturing method thereof

• US 8,994,902 B2
• Filed: 03/19/2009
• Issued: 03/31/2015
• Est. Priority Date: 07/02/2008
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Kim, Sang-Il, Roh, Nam-Seok
• Primary Examiner(s): CHANG, CHARLES S
• Application Number:
  US12/407,225
• Publication Number:
  US 20100002175A1
• Time in Patent Office: 2,203 Days
• Field of Search: 349/74, 349/115, 349/175
• US Class Current: 349/115
• CPC Class Codes: G02F 1/13718 based on a change of the texture state of a cholesteric liquid crystal
• CPC Class Codes: G02F 2201/44 Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers
• CPC Class Codes: G02F 2203/62 Switchable arrangements whereby the element being usually not switchable

Abstract

A display device includes; a first substrate, a second substrate disposed substantially opposite to the first substrate, a third substrate disposed between the first substrate and the second substrate, a color display layer disposed between the first substrate and the third substrate, the color display layer comprising a cholesteric liquid crystal, a first electrode and a second electrode electrically connected to the color display layer, a color conversion layer disposed between the third substrate and the second substrate, and a third electrode and a fourth electrode electrically connected to the color conversion layer.

Claims

1. A display device comprising:

a first substrate;

a second substrate disposed substantially opposite to the first substrate;

a third substrate disposed between the first substrate and the second substrate;

a color display layer disposed between the first substrate and the third substrate, the color display layer comprising a cholesteric liquid crystal;

a first electrode and a second electrode electrically connected to the color display layer;

a color conversion layer disposed between the third substrate and the second substrate; and

a third electrode and a fourth electrode electrically connected to the color conversion layer, wherein a thickness of the third substrate is less than or equal to about 20% of a width of the color display layer or a width of the color conversion layer in one pixel.

2. The display device of claim 1, further comprising:

a first thin film transistor disposed on the first substrate,

wherein the first thin film transistor is electrically connected to the second electrode.

3. The display device of claim 2, further comprising:

a second thin film transistor disposed on one of the second substrate and the third substrate,

wherein the second thin film transistor is electrically connected to the fourth electrode.

4. The display device of claim 2, wherein the third electrode and the fourth electrode have a stripe shape and are disposed substantially perpendicular to each other.

5. The display device of claim 1, wherein the first electrode and the second electrode have a stripe shape and are disposed substantially perpendicular to each other.

6. The display device of claim 5, further comprising:

a thin film transistor disposed on one of the second substrate and the third substrate,

wherein the thin film transistor is electrically connected to the fourth electrode.

7. The display device of claim 5, wherein the third electrode and the fourth electrode have a stripe shape and are disposed substantially perpendicular to each other.

8. The display device of claim 1, wherein the cholesteric liquid crystal is divided into a plurality of cells, and each of the cells comprises one color selected from the group consisting of red, green, blue, yellow, magenta, cyan, and white.

9. The display device of claim 8, wherein the color conversion layer is divided into a plurality of cells, and each of the cells comprises one color selected from the group consisting of an opaque black, a transparent non-chroma, and a semi-transparent ash.

10. The display device of claim 1, wherein the color conversion layer is divided into a plurality of cells, and each of the cells comprises one color selected from the group consisting of an opaque black, a transparent non-chroma, and a semi-transparent ash.

11. The display device of claim 1, wherein the color conversion layer comprises one of an electrochromic organic material, an electrochromic inorganic material, and a reverse emulsion based on an electrophoretic display.

12. The display device of claim 1, wherein the color conversion layer comprises a cell which displays an ash color gradation.

13. A method for manufacturing a display device, the method comprising:

disposing a first thin film element structure including a second electrode on a first substrate;

disposing a color display layer including a cholesteric liquid crystal on the first thin film element structure;

disposing a first electrode under a third substrate;

disposing a second thin film element structure including a fourth electrode on the third substrate;

disposing a color conversion layer on the second thin film element structure;

disposing a third electrode under a second substrate;

combining the first substrate and the third substrate to contact the first electrode with the color display layer; and

combining the third substrate and the second substrate to contact the third electrode with the color conversion layer, wherein a thickness of the third substrate is less than or equal to about 20% of a width of the color display layer or a width of the color conversion layer in one pixel.

14. The method of claim 13, wherein the disposing of the color display layer includes forming a partition to define a plurality of cells, and filling a cholesteric liquid crystal in the cells.

15. The method of claim 14, wherein the disposing of the color conversion layer includes forming a partition to define a plurality of cells, and filling one of an electrochromic organic material, an electrochromic inorganic material, and a reverse emulsion based on an electrophoretic display in the cells.

16. The method of claim 13, wherein the disposing of the color conversion layer includes forming a partition to define a plurality of cells, and filling one of an electrochromic organic material, an electrochromic inorganic material, and a reverse emulsion based on an electrophoretic display in the cells.

17. A method for manufacturing a display device, the method comprising:

disposing a first thin film element structure including a second electrode on a first substrate;

disposing a first electrode under a third substrate;

disposing a color display layer including a cholesteric liquid crystal under the first electrode;

disposing a second thin film element structure including a fourth electrode on the third substrate;

disposing a third electrode under a second substrate;

disposing a color conversion layer under the third electrode;

combining the first substrate and the third substrate to contact the second electrode with the color display layer; and

combining the third substrate and the second substrate to contact the fourth electrode with the color conversion layer, wherein a thickness of the third substrate is less than or equal to about 20% of a width of the color display layer or a width of the color conversion layer in one pixel.

18. The method of claim 17, wherein the disposing of the color display layer includes forming a partition to define a plurality of cells, and filling a cholesteric liquid crystal in the cells.

19. The method of claim 18, wherein the disposing of the color conversion layer includes forming a partition to define a plurality of cells, and filling one of an electrochromic organic material, an electrochromic inorganic material, and a reverse emulsion based on an electrophoretic display in the cells.

20. The method of claim 17, wherein the disposing of the color conversion layer includes forming a partition to define a plurality of cells, and filling one of an electrochromic organic material, an electrochromic inorganic material, and a reverse emulsion based on an electrophoretic display in the cells.

21. The method of claim 17, wherein the thickness of the third substrate is equal to or less than about 20% of the width of one of the color display layer and the color conversion layer in one pixel.

22. A display device comprising:

a first substrate;

a second substrate disposed substantially opposite to the first substrate;

a third substrate disposed between the first substrate and the second substrate;

a first electrode and a second electrode respectively disposed on the third substrate and the first substrate;

a color display layer disposed between the first substrate and the third substrate, the color display layer comprising a cholesteric liquid crystal, the color display layer being controlled to be in one state selected from the group consisting of red, green, blue, yellow, magenta, cyan, white, and transparent by an electric field formed between the first electrode and the second electrode;

a third electrode and a fourth electrode respectively disposed on the second substrate and the third substrate; and

a color conversion layer disposed between the third substrate and the second substrate, the color conversion layer being controlled to convert to one of a transparent state and a black state by an electric field formed between the third electrode and the fourth electrode, wherein a thickness of the third substrate is less than or equal to about 20% of a width of the color display layer or a width of the color conversion layer in one pixel.