Liquid-crystal electro-optical apparatus and method of manufacturing the same

• US 5,594,569 A
• Filed: 07/20/1994
• Issued: 01/14/1997
• Est. Priority Date: 07/22/1993
• Status: Expired due to Term

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Moriya, Kouji, Konuma, Toshimitsu, Murakami, Satoshi, Nishi, Takeshi, Shimizu, Michio, Mori, Harumi
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): NGUYEN, TIEP HUU
• Application Number:
  US08/278,088
• Time in Patent Office: 909 Days
• Field of Search: 359/74, 359/78, 359/79, 359/56, 345/97, 345/89
• US Class Current: 349/122
• CPC Class Codes: G02F 1/133711 by organic films, e.g. polymeric films
• CPC Class Codes: G02F 1/133788 by light irradiation, e.g. linearly polarised light photo-polymerisation
• CPC Class Codes: G02F 1/141 using ferroelectric liquid crystals
• CPC Class Codes: G02F 1/1416 Details of the smectic layer structure, e.g. bookshelf, chevron, C1 and C2

Abstract

A liquid crystal device comprising:

a pair of substrates having an electrode arrangement thereon; an orientation control means provided on at least one of said substrates; and a ferroelectric or antiferroelectric liquid crystal layer interposed between said substrates, said liquid crystal layer being uniaxially oriented by virtue of said orientation control means, wherein means for suppressing an orientation control effect of said orientation control means with respect to said liquid crystal layer is provided between said liquid crystal layer and said orientation control means.

Claims

1. A liquid crystal device comprising:

a pair of substrates having an electrode arrangement thereon;

an orientation control means provided on at least one of said substrates; and

a liquid crystal layer interposed between said substrates, said liquid crystal layer being uniaxially oriented by virtue of said orientation control means,

wherein means, comprising a resin, for decreasing an orientation regulating force of said orientation control means with respect to said liquid crystal layer is provided between said liquid crystal layer and said orientation control means in the form of a plurality of grains.

2. The liquid crystal device of claim 1 wherein said liquid crystal layer comprises a ferroelectric or antiferroelectric liquid crystal.

3. The liquid crystal device of claim 1 wherein said resin is interposed between said liquid crystal layer and said orientation control means in the form of a film.

4. The liquid crystal device of claim 1 wherein the resin partially isolates the orientation control means from the liquid crystal layer.

5. The device of claim 1 wherein a diameter of the grains is not larger than 500 nm.

6. The device of claim 1 wherein an interval between the substrates is 1 to 10 μ

m.

7. A liquid crystal device comprising:

a liquid crystal layer; and

a pair of supports for supporting said liquid crystal layer therebetween, each having at least a base plate and an electrode arrangement formed thereon, at least one of said supports having an orientation control means provided thereon,

wherein a resin is interposed between said liquid crystal layer and an inner most surface of each of said supports in the form of a plurality of grains.

8. The liquid crystal device of claim 7 wherein said resin is a UV cured resin.

9. The liquid crystal device of claim 7 wherein said liquid crystal layer comprises a ferroelectric liquid crystal.

10. The liquid crystal device of claim 7 wherein said liquid crystal layer comprises an antiferroelectric liquid crystal.

11. The liquid crystal device of claim 7 wherein said resin is in the form of a film.

12. The liquid crystal device of claim 7 wherein said resin partially isolates the orientation control means from the liquid crystal layer (is in the form of a plurality of grains].

13. The liquid crystal device of claim 7 wherein said orientation control means is a rubbing film.

14. The device of claim 7 wherein a diameter of the grains is not larger than 500 nm.

15. The device of claim 7 wherein an interval between the supports is 1 to 10 μ

m.

16. A liquid crystal device comprising:

a pair of substrates, at least one of which is transparent;

an electrode arrangement formed on said substrates;

at least one uniaxial orientation control means provided over one of said substrates; and

a liquid crystal layer interposed between said substrates,

wherein a resin is formed at least between said uniaxial orientation control means and said liquid crystal layer in the form of a plurality of grains.

17. The liquid crystal device of claim 16 further comprising a plurality of TFTs in the form of a matrix to drive said liquid crystal layer.

18. The liquid crystal device of claim 16 wherein said device is a simple matrix device.

19. The liquid crystal device of claim 16 wherein said uniaxial orientation control means is a rubbing layer.

20. The device of claim 16 wherein a diameter of the grains is not larger than 500 nm.

21. The device of claim 16 wherein an interval between the substrates is 1 to 10 μ

m.

22. The device of claim 16 wherein the liquid crystal layer comprises a ferroelectric or antiferroelectric liquid crystal.

23. The device of claim 16 wherein the resin partially isolates the orientation control means from the liquid crystal layer.

24. A liquid crystal device comprising:

a pair of substrates, at least one of which is transparent;

an electrode arrangement formed on said substrates, defining a plurality of pixels;

a plurality of thin film transistors formed on one of said substrates for driving said pixels;

a uniaxial orientation control film formed on at least one of said substrates;

a liquid crystal layer; and

a resin provided between said substrates and in direct contact with said liquid crystal layer in the form of a plurality of grains,

wherein said plurality of pixels are driven by a frame gradation display method in which transmitting and non-transmitting of each pixel is controlled with a plurality of frames.

25. The liquid crystal device of claim 24 wherein an orientation direction of liquid crystal molecules in said liquid crystal layer is capable of changing continuously in accordance with a strength of an electric field applied thereto.

26. The liquid crystal device of claim 24 wherein said liquid crystal layer does not form a helical structure in the absence of an electric field applied thereto.

27. The liquid crystal device of claim 24 wherein a voltage is applied to one of said pixels for a certain duration during one frame, said duration being selected from the group consisting T₀, 2T₀, 2² T₀ --2^N T₀ where "N" is a natural number and "T₀ " is a constant value.

28. The device of claim 24 wherein a diameter of the grains is not larger than 500 nm.

29. The device of claim 24 wherein an interval between the substrates is 1 to 10 μ

m.

30. The device of claim 24 wherein the liquid crystal layer comprises a ferroelectric or antiferroelectric liquid crystal.

31. The device of claim 24 wherein the resin partially isolates the orientation control means from the liquid crystal layer.

32. A liquid crystal device comprising:

a pair of substrates, at least one of which is transparent;

an electrode arrangement formed on said substrates, defining a plurality of pixels;

a plurality of thin film transistors formed on one of said substrates for driving said pixels;

a liquid crystal layer interposed between said substrates; and

a uniaxial orientation control film formed on at least one of said substrates,

wherein a helical structure of said liquid crystal is eliminated when applying no voltage thereto and an orientation direction of molecules of said liquid crystal layer is gradually changed in response to a strength of an electric field applied thereto,

wherein a resin is formed at least between the uniaxial orientation control film and the liquid crystal layer in the form of a plurality of grains.

33. The device of claim 32 wherein a diameter of the grains is not larger than 500 nm.

34. The device of claim 32 wherein an interval between the substrates is 1 to 10 m.

35. The device of claim 32 wherein the liquid crystal layer comprises a ferroelectric or antiferroelectric liquid crystal.

36. The device of claim 32 wherein the resin partially isolates the orientation control means from the liquid crystal layer.

37. A liquid crystal device comprising:

a liquid crystal layer; and

a pair of supports for supporting said liquid crystal layer therebetween, each having at least a base plate and an electrode arrangement formed thereon, at least one of said supports having an orientation control means provided thereon,

wherein a plurality of grains comprising a resin are interposed between said liquid crystal layer and an inner most surface of each of said supports, a diameter of said grains being not larger than 500 nm.