Liquid crystal display device and method of manufacturing the same wherein the substrate having particular surface roughness

1. A liquid crystal display device, comprising:

a pair of transparent substrates;

a liquid crystal layer sandwiched between inner surfaces of the transparent substrates; and

a transparent layer formed on the outer surfaces of transparent substrates, the transparent layer having an inner surface facing the transparent substrate and an outer surface opposing to the inner surface,

wherein the whole outer surface of each transparent substrate has a first Ra surface roughness resulted from a thickness reduction process of the transparent substrates and the whole outer surface of the transparent layer has a second Ra surface roughness which is smaller than the first Ra surface roughness, where Ra denotes the center line average surface roughness; and

wherein the first Ra surface roughness is about 0.035 mm.

2. The liquid crystal display device as claimed in claim 1 , wherein the transparent substrate has a refractive index of n g and the transparent layer has a refractive index in the range between about 1 and about (2n g −1).

3. The liquid crystal display device as claimed in claim 2 , wherein the refractive index of the transparent layer is substantially the same as the refractive index of the transparent substrate.

4. The liquid crystal display device as claimed in claim 1 , wherein the transparent layer has a light transmission rate of more than about 99%.

5. The liquid crystal display device as claimed in claim 1 , wherein the transparent layer has a thickness sufficient to planarize the outer surface of the transparent substrate.

6. The liquid crystal display device as claimed in claim 1 , wherein the transparent layer is a transparent adhesive layer.

7. The liquid crystal display device as claimed in claim 6 , further comprising a pair of optical films, each attached on the outer surface of the transparent substrate via the transparent adhesive layer.

8. The liquid crystal display device as claimed in claim 7 , wherein the optical film comprises a polarizer.

9. The liquid crystal display device as claimed in claim 7 , wherein the optical film comprises a retardation film.

10. The liquid crystal display device as claimed in claim 6 , wherein the transparent substrate has a refractive index of n g and the transparent adhesive layer has a refractive index in the range between about 1 and about (2n g −1).

11. The liquid crystal display device as claimed in claim 6 , wherein the refractive index of the transparent adhesive layer is substantially the same as the refractive index of the transparent substrate.

12. The liquid crystal display device as claimed in claim 6 , wherein the transparent adhesive layer has a light transmission rate of more than about 99%.

13. The liquid crystal display device as claimed in claim 6 , wherein the transparent adhesive layer has a thickness sufficient to planarize the outer surface of the transparent substrate.

14. A liquid crystal display device, comprising:

a pair of transparent substrates;

a liquid crystal layer sandwiched between inner surfaces of the transparent substrates; and

a transparent layer formed on the outer surfaces of transparent substrates, the transparent layer having an inner surface facing the transparent substrate and an outer surface opposing to the inner surface,

wherein

the outer surface of each transparent substrate comprises multiple crest and troughs, said creses crests having various heights, and said troughs having various depths, said crests and troughs in the entire said outer surface defining a first Ra surface roughness; and

the entire outer surface of the transparent layer has a second Ra surface roughness which is smaller than the first Ra surface roughness, where Ra denotes the center line average surface roughness.

15. The liquid crystal display device as claimed in claim 14 , wherein the first Ra surface roughness is in the range between about 0.1 mm and about 0.001 mm.

16. The liquid crystal display device as claimed in claim 15 , wherein the first Ra surface roughness is about 0.035 mm.

17. The liquid crystal display device as claimed in claim 14 , wherein the transparent substrate has a refractive index of n g and the transparent layer has a refractive index in the range between about 1 and about (2n g −1).

18. The liquid crystal display device as claimed in claim 17 , wherein the refractive index of the transparent layer is substantially the same as the refractive index of the transparent substrate.

19. The liquid crystal display device as claimed in claim 14 , wherein the transparent layer has a light transmission rate of more than about 99%.

20. The liquid crystal display device as claimed in claim 14 , wherein the transparent layer has a thickness sufficient to planarize the outer surface of the transparent substrate.

21. The liquid crystal display device as claimed in claim 14 , wherein the transparent layer is a transparent adhesive layer.

22. The liquid crystal display device as claimed in claim 21 , further comprising a pair of optical films, each attached on the outer surface of the transparent substrate via the transparent adhesive layer.

23. The liquid crystal display device as claimed in claim 22 , wherein the optical film comprises a polarizer.

24. The liquid crystal display device as claimed in claim 22 , wherein the optical film comprises a retardation film.

25. The liquid crystal display device as claimed in claim 21 , wherein the transparent substrate has a refractive index of n g and the transparent adhesive layer has a refractive index in the range between about 1 and about (2n g −1).

26. The liquid crystal display device as claimed in claim 14 , wherein the first Ra surface roughness is in the range between about 0.035 mm and about 0.001 mm.