Reflective liquid crystal display device having a compensator with a retardation value between 0.15 μm and 0.38 μm and a single polarizer

Claim 2

A reflective liquid crystal display device comprising: a first substrate; a second substrate; a liquid crystal layer interposed between said first substrate and said second substrate; electrodes for applying a voltage to said liquid crystal layer; a single polarizing plate provided on a side of said liquid crystal layer on which said first substrate is provided; a reflective member provided on a side of said liquid crystal layer on which said second substrate is provided; and an optical compensation member provided between said polarizing plate and said liquid crystal layer, wherein said liquid crystal layer has a twist angle in a range of 220° to 260° and a retardation value of 0.5 μm to 0.8 μm, said optical compensation member has a retardation value in a range of 0.15 μm to 0.38 μm, and an angle β which is formed between a polarization axis direction of said polarizing plate and an alignment direction of liquid crystal molecules in said liquid crystal layer on a side of said polarizing plate, and an angle γ which is formed between an axis direction of a slower optical axis of said optical compensation member and an alignment direction of said liquid crystal molecules, satisfy expressions (A1), (A2) and (A3): 90°≦β≦90°(n+1) (A1) -90°≦γ≦90° (A2) 0.5 (β-90°n)+22.5°m-15°≦γ≦0.5(.beta.-90°n)+22.5°m+5° (A3) wherein m is an integer selected from the group of -6, -5, -4, -3, -2, 3 and 4, and n is an integer.

Claim 3

A liquid crystal display device according to claim 1, wherein said reflective member is provided between said first substrate and said liquid crystal layer and has a reflective surface on a side of said liquid crystal layer.

Claim 4

A liquid crystal display device according to claim 2, wherein said reflective member has a ruggedness the levels of which are different by 0.1 μm to 1.5 μm.

Claim 5

A liquid crystal display device according to claim 3, wherein said reflective film is a conductive reflective film and functions as a part of said electrodes.

Claim 6

A liquid crystal display device according to claim 3, further comprising a transparent planation layer formed on said reflective member and planating said ruggedness of said reflective member, and a transparent electrode formed on said planation layer and functioning as a part of said electrodes.

Claim 7

A liquid crystal display device according to claim 3, further comprising a color filter layer on a side of said liquid crystal layer on which said first substrate is provided.

Claim 8

A reflective liquid crystal display device comprising: a first substrate; a second substrate; a liquid crystal layer interposed between said first substrate and said second substrate; electrodes for applying a voltage to said liquid crystal layer; a single polarizing plate provided on a side of said liquid crystal layer on which said first substrate is provided; a reflective member provided on a side of said liquid crystal layer on which said second substrate is provided; and an optical compensation member provided between said polarizing plate and said liquid crystal layer, wherein said liquid crystal layer has a twist angle in a range of 220° to 260° and a retardation value in a range of 0.5 μm to 0.8 μm, said optical compensation member has a retardation value in a range of 0.43 μm to 0.55 μm, and an angle β which is formed between a polarization axis direction of said polarizing plate and an alignment direction of liquid crystal molecules in said liquid crystal layer on a side of said polarizing plate satisfies one of following expressions (C) and (D) when n is an integer: 70°+90°n≦β≦105°+90°n(C) 20°+90°n≦β≦50°+90°n(D).

Claim 9

A reflective liquid crystal display device comprising: a first substrate; a second substrate; a liquid crystal layer interposed between said first substrate and said second substrate; electrodes for applying a voltage to said liquid crystal layer; a single polarizing plate provided on a side of said liquid crystal layer on which said first substrate is provided; a reflective member provided on a side of said liquid crystal layer on which said second substrate is provided; and an optical compensation member provided between said polarizing plate and said liquid crystal layer, wherein said liquid crystal layer has a twist angle in a range of 220° to 260° and a retardation value in a range of 0.5 μm to 0.8 μm, said optical compensation member has a retardation value in a range of 0.43 μm to 0.55 μm, and an angle β which is formed between a polarization axis direction of said polarizing plate and an alignment direction of liquid crystal molecules in said liquid crystal layer on a side of said polarizing plate satisfies one of following expressions (C) and (D) when n is an integer: 70°+90°n≦β≦105°+90°n(C) 20°+90°n≦β≦50°+90°n(D).

Claim 10

A liquid crystal display device according to claim 7, wherein said reflective member is provided between said first substrate and said liquid crystal layer and has a reflective surface on a side of said liquid crystal layer.

Claim 11

A liquid crystal display device according to claim 8, wherein said reflective member has a ruggedness the levels of which are different by 0.1 μm to 1.5 μm.

Claim 12

A liquid crystal display device according to claim 9, wherein said reflective film is a conductive reflective film and functions as a part of said electrodes.

Claim 13

A liquid crystal display device according to claim 9, further comprising a transparent planation layer formed on said reflective member and planating said ruggedness of said reflective member, and a transparent electrode formed on said planation layer and functioning as a part of said electrodes.

Claim 14

A liquid crystal display device according to claim 9, further comprising a color filter layer on a side of said liquid crystal layer on which said first substrate is provided.

Claim 15

A reflective liquid crystal display device comprising: a first substrate; a second substrate; a liquid crystal layer interposed between said first substrate and said second substrate; electrodes for applying a voltage to said liquid crystal layer; a polarizing plate provided on a side of said liquid crystal layer on which said first substrate is provided; a reflective member provided on a side of said liquid crystal layer on which said second substrate is provided; a reflective member provided on a side of said liquid crystal layer on which said second substrate is provided; and an optical compensation member provided between said polarizing plate and said liquid crystal layer, wherein said liquid crystal layer has a twist angle in a range of 220° to 260° and a retardation value in a range of 0.5 μm to 0.8 μm, said optical compensation member has a retardation value in a range of 0 μm to 0.15 μm, and an angle β which is formed between a polarization axis direction of said polarizing plate and an alignment direction of liquid crystal molecules in said liquid crystal layer on a side of said polarizing plate, and an angle γ which is formed between an axis direction of a slower optical axis of said optical compensation member and an alignment direction of said liquid crystal molecules, satisfy one of following expressions (E), (F) and (G) when m and n are integers: 65°+90°n≦β≦110°+90°n, and -20°+90°m≦γ≦10°+90m(E) 30°+90°n≦β≦70°+90°n, and -75°+180°m≦γ≦-45°+180°m(F) 80°+90°n≦β≦120°+90°n, and 20°+180°m≦γ≦-50°+180°m(G); and further comprising a transparent planation layer formed on said reflective member and planating a ruggedness of said reflective member, and a transparent electrode formed on said planation layer and functioning as a part of said electrodes.

Claim 16

A reflective liquid crystal display device comprising: a first substrate; a second substrate; a liquid crystal layer interposed between said first substrate and said second substrate; electrodes for applying a voltage to said liquid crystal layer; a polarizing plate provided on a side of said liquid crystal layer on which said first substrate is provided; a reflective member provided on a side of said liquid crystal layer on which said second substrate is provided; a reflective member provided on a side of said liquid crystal layer on which said second substrate is provided; and an optical compensation member provided between said polarizing plate and said liquid crystal layer, wherein said liquid crystal layer has a twist angle in a range of 220° to 260° and a retardation value in a range of 0.5 μm to 0.8 μm, said optical compensation member has a retardation value in a range of 0 μm to 0.15 μm, and an angle β which is formed between a polarization axis direction of said polarizing plate and an alignment direction of liquid crystal molecules in said liquid crystal layer on a side of said polarizing plate, and an angle γ which is formed between an axis direction of a slower optical axis of said optical compensation member and an alignment direction of said liquid crystal molecules, satisfy one of following expressions (E), (F) and (G) when m and n are integers: 65°+90°n≦β≦110°+90°n, and -20°+90°m≦γ≦10°+90m(E) 30°+90°n≦β≦70°+90°n, and -75°+180°m≦γ≦-45°+180°m(F) 80°+90°n≦β≦120°+90°n, and 20°+180°m≦γ≦-50°+180°m(G); and further comprising a transparent planation layer formed on said reflective member and planating a ruggedness of said reflective member, and a transparent electrode formed on said planation layer and functioning as a part of said electrodes.

Claim 17

A liquid crystal display device according to claim 13, wherein said reflective member is provided between said first substrate and said liquid crystal layer and has a reflective surface on a side of said liquid crystal layer.

Claim 18

A liquid crystal display device according to claim 14, wherein said reflective member has a ruggedness the levels of which are different by 0.1 μm to 1.5 μm.

Claim 19

A liquid crystal display device according to claim 15, wherein said reflective film is a conductive reflective film and functions as a part of said electrodes.

Claim 20

A liquid crystal display device according to claim 15, further comprising a color filter layer on a side of said liquid crystal layer on which said first substrate is provided.

Claim 21

A reflective liquid crystal display device comprising: a first substrate; a second substrate; a liquid crystal layer interposed between said first substrate and said second substrate; electrodes for applying a voltage to said liquid crystal layer; a single polarizing plate provided on a side of said liquid crystal layer on which said first substrate is provided; a reflective member provided on a side of said liquid crystal layer on which said second substrate is provided; and an optical compensation member provided between said polarizing plate and said liquid crystal layer, wherein said liquid crystal layer has a twist angle in a range of 220° to 260° and a retardation value in a range of 0.5 μm to 0.8 μm, said optical compensation member has a retardation value in a range of 0.38 μm to 0.43 μm, and an angle β which is formed between a polarization axis direction of said polarizing plate and an alignment direction of liquid crystal molecules in said liquid crystal layer on a side of said polarizing plate, and an angle γ which is formed between an axis direction of a slower optical axis of said optical compensation member and an alignment direction of said liquid crystal molecules, satisfy one of following expressions (H), (I) and (J) when m and n are integers: 50°+90°n≦β≦110°+90°n, and -20°+90°m≦γ≦10°+90°m(H) 30°+90°n≦β≦80°+90°n, and 20°+180°m≦γ≦60°+180°m(I) 70°+90°n≦β≦120°+90°n, and -75°+180°m≦γ≦-50°+180°m(J).

Claim 22

A reflective liquid crystal display device comprising: a first substrate; a second substrate; a liquid crystal layer interposed between said first substrate and said second substrate; electrodes for applying a voltage to said liquid crystal layer; a single polarizing plate provided on a side of said liquid crystal layer on which said first substrate is provided; a reflective member provided on a side of said liquid crystal layer on which said second substrate is provided; and an optical compensation member provided between said polarizing plate and said liquid crystal layer, wherein said liquid crystal layer has a twist angle in a range of 220° to 260° and a retardation value in a range of 0.5 μm to 0.8 μm, said optical compensation member has a retardation value in a range of 0.38 μm to 0.43 μm, and an angle β which is formed between a polarization axis direction of said polarizing plate and an alignment direction of liquid crystal molecules in said liquid crystal layer on a side of said polarizing plate, and an angle γ which is formed between an axis direction of a slower optical axis of said optical compensation member and an alignment direction of said liquid crystal molecules, satisfy one of following expressions (H), (I) and (J) when m and n are integers: 50°+90°n≦β≦110°+90°n, and -20°+90°m≦γ≦10°+90°m(H) 30°+90°n≦β≦80°+90°n, and 20°+180°m≦γ≦60°+180°m(I) 70°+90°n≦β≦120°+90°n, and -75°+180°m≦γ≦-50°+180°m(J).

Claim 23

A liquid crystal display device according to claim 18, wherein said reflective member is provided between said first substrate and said liquid crystal layer and has a reflective surface on a side of said liquid crystal layer.

Claim 24

A liquid crystal display device according to claim 19, wherein said reflective member has a ruggedness the levels of which are different by 0.1 μm to 1.5 μm.

Claim 25

A liquid crystal display device according to claim 20, wherein said reflective film is a conductive reflective film and functions as a part of said electrodes.

Claim 26

A liquid crystal display device according to claim 20, further comprising a transparent planation layer formed on said reflective member and planating said ruggedness of said reflective member, and a transparent electrode formed on said planation layer and functioning as a part of said electrodes.

Claim 27

A liquid crystal display device according to claim 20, further comprising a color filter layer on a side of said liquid crystal layer on which said first substrate is provided.

Claim 28

A reflective liquid crystal display device comprising: a first substrate; a second substrate; a liquid crystal layer interposed between said first substrate and said second substrate; electrodes for applying a voltage to said liquid crystal layer; a single polarizing plate provided on a side of said liquid crystal layer on which said first substrate is provided; a reflective member provided on a side of said liquid crystal layer on which said second substrate is provided; and an optical compensation member provided between said polarizing plate and said liquid crystal layer, wherein said liquid crystal layer has a twist angle in a range of 220° to 260° and a retardation value of 0.5 μm to 0.8 μm, said optical compensation member has a retardation value in a range of 0.25 μm to 0.35 μm, and an angle β which is formed between a polarization axis direction of said polarizing plate and an alignment direction of liquid crystal molecules in said liquid crystal layer on a side of said polarizing plate, and an angle γ which is formed between an axis direction of a slower optical axis of said optical compensation member and an alignment direction of said liquid crystal molecules, satisfy expressions (B1), (B2) and (B3): 90°n≦β≦90°(+1) (B1) -90°≦γ≦90° (B2) 0.5(β-90°n)+22.5°m-15°≦γ≦0.5(β-90°n)+22.5°m+5° (B3) wherein m is an integer selected from the group of -6, -5, -4, 3 and 4, and n is an integer.

Claim 29

A reflective liquid crystal display device comprising: a first substrate; a second substrate; a liquid crystal layer interposed between said first substrate and said second substrate; electrodes for applying a voltage to said liquid crystal layer; a single polarizing plate provided on a side of said liquid crystal layer on which said first substrate is provided; a reflective member provided on a side of said liquid crystal layer on which said second substrate is provided; and an optical compensation member provided between said polarizing plate and said liquid crystal layer, wherein said liquid crystal layer has a twist angle in a range of 220° to 260° and a retardation value of 0.5 μm to 0.8 μm, said optical compensation member has a retardation value in a range of 0.25 μm to 0.35 μm, and an angle β which is formed between a polarization axis direction of said polarizing plate and an alignment direction of liquid crystal molecules in said liquid crystal layer on a side of said polarizing plate, and an angle γ which is formed between an axis direction of a slower optical axis of said optical compensation member and an alignment direction of said liquid crystal molecules, satisfy expressions (B1), (B2) and (B3): 90°n≦β≦90°(+1) (B1) -90°≦γ≦90° (B2) 0.5(β-90°n)+22.5°m-15°≦γ≦0.5(β-90°n)+22.5°m+5° (B3) wherein m is an integer selected from the group of -6, -5, -4, 3 and 4, and n is an integer.

Claim 30

A liquid crystal display device according to claim 24, wherein said reflective member is provided between said first substrate and said liquid crystal layer and has a reflective surface on a side of said liquid crystal layer.

Claim 31

A liquid crystal display device according to claim 25, wherein said reflective member has a ruggedness the levels of which are different by 0.1 μm to 1.5 μm.

Claim 32

A liquid crystal display device according to claim 26, wherein said reflective film is a conductive reflective film and functions as a part of said electrodes.

Claim 33

A liquid crystal display device according to claim 26, further comprising a transparent planation layer formed on said reflective member and planating said ruggedness of said reflective member, and a transparent electrode formed on said planation layer and functioning as a part of said electrodes.

Claim 34

A liquid crystal display device according to claim 26, further comprising a color filter layer on a side of said liquid crystal layer on which said first substrate is provided.