Display device with stack of polarizers having wavelength distributions of extinction coefficient of absorption axes
First Claim
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1. A display device comprising:
- a first light-transmissive substrate and a second light-transmissive substrate which are provided so as to face each other;
a display element provided between the first light-transmissive substrate and the second light-transmissive substrate;
a first layer including first stack of polarizers outside the first light-transmissive substrate; and
a second layer including second stack of polarizers outside the second light-transmissive substrate,wherein;
polarizers in each of the first stack of polarizers and the second stack of polarizers have different wavelength distributions of extinction coefficients of absorption axes,absorption axes of polarizers in the first stack of polarizers are in a parallel nicol state,absorption axes of polarizers in the second stack of polarizers are in a parallel nicol state,the absorption axes of a polarizers in the first stack of polarizers and those of a polarizers in the second stack of polarizers are deviated from a cross nicol state, andan absolute value of an angle of a deviation of the absorption axes of the polarizers in the first stack of polarizers from those of the polarizers in the second stack of polarizers is more than 0° and
equal to or less than 3°
.
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Abstract
An object of the invention is to provide a display device having a high contrast ratio. Another object of the invention is to manufacture such a high-performance display device at low cost. In a display device having a display element between a pair of light-transmissive substrates, polarizer-including layers, which have different wavelength distributions of extinction coefficients, are stacked so that absorption axes are in a parallel nicol state, over each light-transmissive substrate. Absorption axes of one of a pair of stacks of polarizers and the other together which interpose the display element are deviated from a cross nicol state. A retardation plate may be provided between the stack of polarizing plates and the substrate.
171 Citations
15 Claims
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1. A display device comprising:
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a first light-transmissive substrate and a second light-transmissive substrate which are provided so as to face each other; a display element provided between the first light-transmissive substrate and the second light-transmissive substrate; a first layer including first stack of polarizers outside the first light-transmissive substrate; and a second layer including second stack of polarizers outside the second light-transmissive substrate, wherein; polarizers in each of the first stack of polarizers and the second stack of polarizers have different wavelength distributions of extinction coefficients of absorption axes, absorption axes of polarizers in the first stack of polarizers are in a parallel nicol state, absorption axes of polarizers in the second stack of polarizers are in a parallel nicol state, the absorption axes of a polarizers in the first stack of polarizers and those of a polarizers in the second stack of polarizers are deviated from a cross nicol state, and an absolute value of an angle of a deviation of the absorption axes of the polarizers in the first stack of polarizers from those of the polarizers in the second stack of polarizers is more than 0° and
equal to or less than 3°
. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A display device comprising:
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a first light-transmissive substrate and a second light-transmissive substrate which are provided so as to face each other; a display element provided between the first light-transmissive substrate and the second light-transmissive substrate; a first layer including first stack of polarizers outside the first light-transmissive substrate; a second layer including second stack of polarizers outside the second light-transmissive substrate; a first retardation plate between the first light-transmissive substrate and the first layer including the first stack of polarizers; and a second retardation plate between the second light-transmissive substrate and the second layer including the second stack of polarizers, wherein; polarizers in each of the first stack of polarizers and the second stack of polarizers have different wavelength distributions of extinction coefficient of absorption axes, absorption axes of polarizers in the first stack of polarizers are in a parallel nicol state, absorption axes of polarizers in the second stack of polarizers are in a parallel nicol state, the absorption axes of a polarizers in the first stack of polarizers and those of a polarizers in the second stack of polarizers are deviated from a cross nicol state, an absolute value of an angle of a deviation of the absorption axes of the polarizers in the first stack of polarizers from those of the polarizers in the second stack of polarizers is more than 0° and
equal to or less than 3°
. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification
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Current AssigneeSemiconductor Energy Laboratory Co., Ltd.
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Original AssigneeSemiconductor Energy Laboratory Co., Ltd.
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InventorsEgi, Yuji, Ishitani, Tetsuji, Nishi, Takeshi
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Primary Examiner(s)Nguyen; Hoan C
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Application NumberUS11/677,252Publication NumberTime in Patent Office1,413 DaysField of Search349/96, 349/104, 349/105, 349117-119, 349/194US Class Current349/96CPC Class CodesG02F 1/133531 characterised by the arrang...G02F 1/133533 Colour selective polarisers...
