Vertical alignment mode reflective-transmissive liquid crystal display with multi cell gap
First Claim
Patent Images
1. A liquid crystal display (LCD) having a reflective region and a transmissive region, comprising:
- a first substrate having an upper surface and a lower surface;
a second substrate having an upper surface and a lower surface and facing the first substrate;
a cell formed between the upper surface of the first substrate and the lower surface of the second substrate, the cell having a plurality cell-gaps;
a vertically aligned liquid crystal layer disposed in the cell, wherein the reflective region has a first cell-gap ranging from about 1.8 μ
m to about 2.2 μ
m, and the transmissive region has a second cell-gap ranging from about 3.6 μ
m to about 4.0 μ
m;
a first optical film assembly disposed on the lower surface of the first substrate and comprising a first polarizer, a first λ
/4 retardation film disposed on the lower surface of the first substrate, and a first λ
/2 retardation film disposed on the first λ
/4 retardation film; and
a second optical film assembly disposed on the upper surface of the second substrate and comprising a second polarizer, a second λ
/4 retardation film disposed on the upper surface of the second substrate and a second λ
/2 retardation film disposed on the second λ
/4 retardation film, wherein slow axes of the second λ
/4 and λ
/12 retardation films are slanted at angles that lie in same quadrant with respect to an absorption axis of the second polarizer, wherein a slow axis of the first λ
/2 retardation film and the slow axis of the second λ
/2 retardation film form an angle ranged from about 80°
to about 100°
, and wherein the LCD has a threshold voltage equal to or less than about 2.0 V and a saturation voltage equal to or less than about 4.4V.
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Accused Products
Abstract
A vertical alignment mode reflective-transmissive liquid crystal display (LCD) includes the first substrate having an upper surface and a lower surface and the second substrate having an upper surface and a lower surface and facing the first substrate. A cell is formed between the upper surface of the first substrate and the lower surface of the second substrate. The cell has a plurality cell-gaps. A vertically aligned liquid crystal layer is disposed in the cell. The reflective region of the LCD has a cell-gap ranging from about 1.8 μm to about 2.2 μm, and the transmissive region of the LCD has a cell-gap ranging from about 3.6 μm to about 4.0 μm. The first optical film assembly including the first polarizer is disposed on the lower surface of the first substrate. The second optical film assembly including the second polarizer is disposed on the upper surface of the second substrate. An absorption axis of the first polarizer is substantially perpendicular to that of the second polarizer.
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Citations
18 Claims
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1. A liquid crystal display (LCD) having a reflective region and a transmissive region, comprising:
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a first substrate having an upper surface and a lower surface; a second substrate having an upper surface and a lower surface and facing the first substrate; a cell formed between the upper surface of the first substrate and the lower surface of the second substrate, the cell having a plurality cell-gaps; a vertically aligned liquid crystal layer disposed in the cell, wherein the reflective region has a first cell-gap ranging from about 1.8 μ
m to about 2.2 μ
m, and the transmissive region has a second cell-gap ranging from about 3.6 μ
m to about 4.0 μ
m;a first optical film assembly disposed on the lower surface of the first substrate and comprising a first polarizer, a first λ
/4 retardation film disposed on the lower surface of the first substrate, and a first λ
/2 retardation film disposed on the first λ
/4 retardation film; anda second optical film assembly disposed on the upper surface of the second substrate and comprising a second polarizer, a second λ
/4 retardation film disposed on the upper surface of the second substrate and a second λ
/2 retardation film disposed on the second λ
/4 retardation film, wherein slow axes of the second λ
/4 and λ
/12 retardation films are slanted at angles that lie in same quadrant with respect to an absorption axis of the second polarizer, wherein a slow axis of the first λ
/2 retardation film and the slow axis of the second λ
/2 retardation film form an angle ranged from about 80°
to about 100°
, and wherein the LCD has a threshold voltage equal to or less than about 2.0 V and a saturation voltage equal to or less than about 4.4V. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A liquid crystal display (LCD) having a reflective region and a transmissive region, comprising:
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a first substrate having an upper surface and a lower surface; a second substrate having an upper surface and a lower surface and facing the first substrate; a cell formed between the upper surface of the first substrate and the lower surface of the second substrate, the cell having a plurality cell-gaps; a vertically aligned liquid crystal layer disposed in the cell, wherein the reflective region has a first cell-gap ranging from about 1.8 μ
m to about 2.2 μ
m, and the transmissive region has a second cell-gap ranging from about 3.6 μ
m to about 4.0 μ
m;a first optical film assembly disposed on the lower surface of the first substrate and comprising a first polarizer, a first λ
/4 retardation film disposed on the lower surface of the first substrate, and a first λ
/2 retardation film disposed on the first λ
/4 retardation film; anda second optical film assembly disposed on the upper surface of the second substrate and comprising a second polarizer, a second λ
/4 retardation film disposed on the upper surface of the second substrate and a second λ
/2 retardation film disposed on the second λ
/4 retardation film, wherein;a slow axis of the first λ
/4 retardation film and a slow axis of the second λ
/4 retardation film form an angle ranged from about 80°
to about 100°
, anda slow axis of the first λ
/2 retardation film and a slow axis of the second λ
/2 retardation film form an angle ranged from about 80°
to about 100°
, wherein the LCD has a threshold voltage equal to or less than about 2.0 V and a saturation voltage equal to or less than about 4.4V.
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Specification
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Current AssigneeSamsung Display Company Limited (Samsung Electronics Co. Ltd.)
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Original AssigneeSamsung Electronics Co. Ltd.
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InventorsCha, Sung-Eun, Kim, Sang-Woo, Kim, Jae-Hyun, Lee, Jae-Young, Park, Won-Sang, Lim, Jae-Ik
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Primary Examiner(s)Nguyen; Dung T.
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Application NumberUS10/995,474Publication NumberTime in Patent Office1,623 DaysField of Search349/114, 349117-119, 349 96- 98, 349/129US Class Current349/119CPC Class CodesG02F 1/133371 Cells with varying thicknes...G02F 1/133555 TransflectorsG02F 1/1393 the birefringence of the li...
