Liquid crystal display device having thin glass substrate on which protective layer formed and method of making the same

• US 6,327,011 B2
• Filed: 10/20/1997
• Issued: 12/04/2001
• Est. Priority Date: 10/20/1997
• Status: Expired due to Term

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Woong Kwon
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): NGUYEN, DUNG T
• Application Number:
  US08/954,124
• Publication Number:
  US 20010012083A1
• Time in Patent Office: 1,506 Days
• Field of Search: 349/158, 349/122, 349/96
• US Class Current: 349/122
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
• CPC Class Codes: C09K 2323/051 Inorganic, e.g. glass or silicon oxide
• CPC Class Codes: C09K 2323/055 Epoxy
• CPC Class Codes: C09K 2323/061 Inorganic, e.g. ceramic, metallic or glass
• CPC Class Codes: G02F 1/1333 Constructional arrangements; Manufacturing methodsG02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/133302 Rigid substrates, e.g. inorganic substrates
• CPC Class Codes: Y10T 428/31518 Next to glass or quartz

Abstract

The LCD according to present invention includes a first substrate and a second substrate, two protective layers including at least one layer formed on outer surface of the first and second substrates, a transparent electrode formed on inner surface of the first substrate or the second substrate, an alignment layer formed on the transparent electrode, and two polarizers attached on the first and second substrates.

Claims

1. A thin glass substrate of a liquid crystal display device, comprising:

a glass substrate having a transparent electrode on its upper surface and configured to be coupled with another substrate to enclose a liquid crystal, the glass substrate having a chemically etched back surface; and

at least one transparent protective layer on the back surface of the glass substrate to reinforce the glass substrate for preventing cracks which occur due to an external impact, the at least one transparent protective layer including an inorganic layer and an organic layer, the organic layer having a thermosetting resin and a viscosity coefficient of the thermosetting resin being several cp to several ten cp.

2. The thin glass substrate according to claim 1, wherein a refractive index of the transparent protective layer is 1.4-1.6.

3. A thin glass substrate according to claim 1, wherein a thickness of the glass substrate is less than about 0.7 mm.

4. A liquid crystal display device, comprising:

a first glass substrate and a second glass substrate coupled with the first glass substrate, at least one of the first and second glass substrates having a chemically etched outer surface;

a transparent protective layer on the chemically etched outer surface, the transparent protective layer reinforcing the at least one of the first and second glass substrates to prevent cracks which may occur due to an external impact, the transparent protective layer including an inorganic layer and an organic layer, the organic layer having a thermosetting resin and a viscosity coefficient of the thermosetting resin being several cp to several ten cp;

a transparent electrode on an inner surface of each of the first glass substrate and the second glass substrate;

an alignment layer on each transparent electrode; and

a liquid crystal layer between the first glass substrate and the second glass substrate.

5. The liquid crystal display device according to claim 4 wherein a refractive index of the transparent protective layer is 1.4-1.6.

6. The liquid crystal display device according to claim 4 wherei n the at least one of the first and second substrates that has the transparent protective layer thereon has a thickness of less than about 0.7 mm.

7. A liquid crystal display device, comprising:

a first glass substrate and a second glass substrate coupled with the first glass substrate, at least one of the first and second glass substrates having a chemically etched surface;

a transparent protective layer formed on an outer surface of at least one of the first and second glass substrates, the transparent protective layer reinforcing at least one of the first and second glass substrates to prevent cracks which occur due to an external impact, the transparent protective layer including an inorganic layer and an organic layer, the organic layer having a thermosetting resin and a viscosity coefficient of the thermosetting resin being several cp to several ten cp;

a transparent electrode on an inner surface of each of the first glass substrate and the second glass substrate;

an alignment layer formed on each transparent electrode; and

a liquid crystal layer between the first glass substrate and the second glass substrate.

8. The device according to claim 7, further comprising a polarizer formed on the transparent protective layer.

9. A thin glass substrate of a liquid crystal display device, comprising:

a glass substrate having a transparent electrode on its upper surface and having a chemically etched back surface; and

a transparent protective layer on the back surface of the glass substrate, the transparent protective layer including an inorganic layer and an organic layer, the organic layer having a thermosetting resin and a viscosity coefficient of the thermosetting resin being several cp to several ten cp.

10. A method of manufacturing a thin glass substrate of a liquid crystal display device, comprising the steps of:

providing a glass substrate;

processing the glass substrate to reduce the weight of the glass substrate, including chemically etching a back surface of the glass substrate; and

forming a protective layer on the back surface of the glass substrate, the protective layer reinforcing the glass substrate to prevent cracks which may occur due to an external impact, the protective layer including an inorganic layer and an organic layer, the organic layer having a thermosetting resin and a viscosity coefficient of the thermosetting resin being several cp to several ten cp.

11. The method according to claim 10, wherein the step of processing includes steps of:

grinding a glass; and

scribing the glass substrate.

12. The method according to claim 10, wherein the step of processing the glass substrate is executed after forming the protective layer.

13. The method according to claim 10, wherein the step of processing includes the step of thinning the glass substrate by etching.

14. The method according to claim 10, wherein the step of forming the protective layer further includes steps of:

forming the organic layer by light irradiation after depositing an organic matter on the glass substrate; and

forming the inorganic layer by coating an inorganic matter on the organic layer.

15. The method according to claim 14, wherein the light is an ultraviolet or a visible ray.

16. The method according to claim 10, wherein the step of forming the protective layer further includes steps of:

forming the inorganic layer by coating an inorganic matter on the glass substrate; and

forming the organic layer by light irradiation after depositing an organic matter on the inorganic layer.

17. The method according to claim 16, wherein the light is an ultraviolet or a visible ray.

18. The method according to claim 10, wherein the step of processing the glass substrate includes thinning the glass substrate to a thickness of less than about 0.7 mm.

19. A method of manufacturing a liquid crystal display device, comprising the steps of:

providing a first glass substrate and a second glass substrate;

forming a transparent electrode on an inner surface of each of the first glass substrate and the second glass substrate;

forming an alignment layer on each transparent electrode;

assembling the first and second glass substrates;

forming a liquid crystal layer between the first glass substrate and the second glass substrate;

processing at least one of the first and second glass substrates to reduce the weight of the glass substrate; and

forming a transparent protective layer on an outer surface of at least one of the first glass substrate and the second glass substrate, the transparent protective layer reinforcing the at least one of the first and second glass substrates to prevent cracks which occur due to an external impact, the transparent protective layer including an inorganic layer and an organic layer, the organic layer having a thermosetting resin and a viscosity coefficient of the thermosetting resin being several cp to several ten cp.

20. The method according to claim 19, wherein the at least one of the first and second substrates that has the transparent protective layer thereon has a thickness of less than about 0.7 mm.

21. A method of manufacturing a liquid crystal display device, comprising the steps of:

providing a glass;

forming a glass substrate having a chemically etched surface by processing the surface of the glass; and

forming a transparent protective layer on the processed surface of the glass substrate, the transparent protective layer including an organic layer and an inorganic layer, the organic layer having a thermosetting resin and a viscosity coefficient of the thermosetting resin being several cp to several ten cp.

22. The method according to claim 21, wherein the step of forming the transparent protective layer includes the steps of:

forming the inorganic layer by coating an inorganic matter on the glass substrate; and

forming the organic layer by light irradiation after depositing an organic matter on the inorganic layer.

23. The method according to claim 22, wherein the light irradiation in the step of forming the organic layer includes an ultraviolet or a visible ray.

24. The method according to claims 21, wherein the step of forming the transparent protective layer includes the steps of:

forming the organic layer by light irradiation after depositing an organic matter on the glass substrate; and

forming the inorganic layer by coating an inorganic matter on the organic layer.

25. The method according to claim 24, wherein the light irradiation in the step of forming the organic layer includes an ultraviolet or a visible ray.