Reflective-type liquid crystal display device having two uniaxial compensation films of same type and method for making the same
View Patent ↗A reflective type liquid crystal display device Includes first and second substrates, a liquid crystal layer between the first and second substrates, and at least one uniaxial optical compensation film on the second substrate.
1. A reflective-type liquid crystal display device, comprising:
first and second substrates;
a reflective electrode over the first substrate, wherein the reflective electrode comprises an opaque metal;
a liquid crystal layer disposed interjacent the first and second substrates;
two uniaxial optical compensation films of a same type over the second substrate, wherein an ordinary refractive index of each of the two uniaxial optical compensation films is the same, wherein a phase difference between the two compensation films is 30–40 nm, and wherein a difference in anisotropic refractive indices of an optical compensation film is 0.005–0.006 such that a viewing angle larger than 40° is achieved; and
a first alignment layer over the first substrate.
2. The device of claim 1 , wherein said two uniaxial optical compensation films are positive-type.
3. The device of claim 1 , wherein the first alignment layer includes multiple alignment directions.
4. A method of manufacturing a reflective-type liquid crystal display device, comprising:
providing first and second substrates;
forming a reflective electrode over the first substrate, wherein the reflective electrode comprises an opaque metal;
providing a liquid crystal layer disposed interjacent the first and second substrates;
providing two uniaxial optical compensation films of a same type over the second substrate, wherein an ordinary refractive index of each of the two uniaxial optical compensation films is the same, wherein a phase difference between the two compensation films is 30–40 nm and wherein a difference in anisotropic refractive indices of an optical compensation film is 0.005–0.006 such that a viewing angle larger than 40° is achieved; and
forming a first alignment layer over the first substrate.
5. The method of claim 4 , wherein said two uniaxial optical compensation films are positive-type.
6. The method of claim 4 , wherein said forming a first alignment layer includes exposing said first alignment layer to ultraviolet light to form a plurality of alignment directions.
7. The method of claim 4 , wherein said forming a first alignment layer includes rubbing a surface of said first alignment layer to form a plurality of first alignment directions.
8. A reflective-type liquid crystal display device, comprising:
first and second substrates;
a reflective electrode over the first substrate;
a liquid crystal layer disposed interjacent the first and second substrates;
two uniaxial optical compensation films of a same type and shape over the second substrate, wherein an ordinary refractive index of each of the two uniaxial optical compensation films is the same, wherein a phase difference between the two compensation films is 30–40 nm, and wherein a difference in anisotropic refractive indices of an optical compensation film is 0.005–0.006 such that a viewing angle larger than 40° is achieved; and
a first alignment layer over the first substrate.
9. The device of claim 8 , wherein said two uniaxial optical compensation films are positive-type.
10. The device of claim 8 , wherein the first alignment layer includes multiple alignment directions.
11. A method of manufacturing a reflective-type liquid crystal display device, comprising:
providing first and second substrates;
forming a reflective electrode over the first substrate;
providing a liquid crystal layer disposed interjacent the first and second substrates;
providing two uniaxial optical compensation films of a same type and shape over the second substrate, wherein an ordinary refractive index of each of the two uniaxial optical compensation films is the same, wherein a phase difference between the two compensation films is 30–40 nm, and wherein a difference in anisotropic refractive indices of an optical compensation film is 0.005–0.006 such that a viewing angle larger than 40° is achieved; and
forming a first alignment layer over the first substrate.
12. The method of claim 11 , wherein said two uniaxial optical compensation films are positive-type.
13. The method of claim 11 , wherein said forming a first alignment layer includes exposing said first alignment layer to ultraviolet light to form a plurality of alignment directions.
14. The method of claim 11 , wherein said forming a first alignment layer includes rubbing a surface of said first alignment layer to form a plurality of first alignment directions.