Display device having stacked polarizers that differ in degrees of light absorbing bands and that are between a pair of protective layers such that no protective layer is located between the stacked polarizers
First Claim
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1. A display device comprising:
- a first light-transmitting substrate and a second light-transmitting substrate which are disposed to face each other;
a display element sandwiched between the first light-transmitting substrate and the second light-transmitting substrate; and
a layer including stacked polarizers on an outer side of the first light-transmitting substrate or the second light-transmitting substrate,wherein;
the stacked polarizers are arranged so that their absorption axes are deviated from a parallel Nicols state,a distribution of a degree to which a first one of the stacked polarizers absorbs light across a band of wavelengths differs from a distribution of a degree to which a second one of the stacked polarizers absorbs light across the band of wavelengths, andthe stacked polarizers are provided between a pair of protective layers arranged such that no protective layer is located between the stacked polarizers.
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Abstract
To provide a display device having a high contrast ratio by a simple and easy method and to manufacture a high-performance display device at low cost, in a display device having a display element between a pair of light-transmitting substrates, layers each including a polarizer having different wavelength distribution of extinction coefficient from each other with respect to the absorption axes are stacked and provided on an outer side of the light-transmitting substrates. Further, a retardation plate may be provided between the stacked polarizers.
206 Citations
16 Claims
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1. A display device comprising:
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a first light-transmitting substrate and a second light-transmitting substrate which are disposed to face each other; a display element sandwiched between the first light-transmitting substrate and the second light-transmitting substrate; and a layer including stacked polarizers on an outer side of the first light-transmitting substrate or the second light-transmitting substrate, wherein; the stacked polarizers are arranged so that their absorption axes are deviated from a parallel Nicols state, a distribution of a degree to which a first one of the stacked polarizers absorbs light across a band of wavelengths differs from a distribution of a degree to which a second one of the stacked polarizers absorbs light across the band of wavelengths, and the stacked polarizers are provided between a pair of protective layers arranged such that no protective layer is located between the stacked polarizers. - View Dependent Claims (2)
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3. A display device comprising:
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a first light-transmitting substrate and a second light-transmitting substrate which are disposed to face each other; a display element sandwiched between the first light-transmitting substrate and the second light-transmitting substrate; and a layer including stacked polarizers on an outer side of the first light-transmitting substrate or the second light-transmitting substrate; and a retardation plate provided between the layer including the stacked polarizers and the first light-transmitting substrate or the second light-transmitting substrate, wherein; the stacked polarizers are arranged so that their absorption axes are deviated from a parallel Nicols states a distribution of a degree to which a first one of the stacked polarizers absorbs light across a band of wavelengths differs from a distribution of a degree to which a second one of the stacked polarizers absorbs light across the band of wavelengths, and the stacked polarizers are provided between a pair of protective layers arranged such that no protective layer is located between the stacked polarizers. - View Dependent Claims (4)
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5. A display device comprising:
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a first light-transmitting substrate and a second light-transmitting substrate which are disposed to face each other; a display element sandwiched between the first light-transmitting substrate and the second light-transmitting substrate; a first layer including first stacked polarizers on an outer side of the first light-transmitting substrate; a second layer including second stacked polarizers on an outer side of the second light-transmitting substrate, wherein; the first stacked polarizers are arranged so that their absorption axes are deviated from a parallel Nicols state, the second stacked polarizers are arranged so that their absorption axes are in a parallel Nicols state, a distribution of a degree to which a first one of the first stacked polarizers absorbs light across a first band of wavelengths differs from a distribution of a degree to which a second one of the first stacked polarizers absorbs light across the first band of wavelengths, a distribution of a degree to which a first one of the second stacked polarizers absorbs light across a second band of wavelengths differs from a distribution of a degree to which a second one of the second stacked polarizers absorbs light across the second band of wavelengths, and the first stacked polarizers are provided between a first pair of protective layers arranged such that no protective layer is located between the first stacked polarizers, and the second stacked polarizers are provided between a second pair of protective layers. - View Dependent Claims (6, 7)
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8. A display device comprising:
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a first light-transmitting substrate and a second light-transmitting substrate which are disposed to face each other; a display element sandwiched between the first light-transmitting substrate and the second light-transmitting substrate; a first layer including first stacked polarizers on an outer side of the first light-transmitting substrate; a second layer including second stacked polarizers on an outer side of the second light-transmitting substrate; a first retardation plate between the first layer including the first stacked polarizers and the first light-transmitting substrate; a second retardation plate between the second layer including the second stacked polarizers and the second light-transmitting substrate, wherein; the first stacked polarizers are arranged so that their absorption axes are deviated from a parallel Nicols state, the second stacked polarizers are arranged so that their absorption axes are in a parallel Nicols state, a distribution of a degree to which a first one of the first stacked polarizers absorbs light across a first band of wavelengths differs from a distribution of a degree to which a second one of the first stacked polarizers absorbs light across the first band of wavelengths, a distribution of a degree to which a first one of the second stacked polarizers absorbs light across a second band of wavelengths differs from a distribution of a degree to which a second one of the second stacked polarizers absorbs light across the second band of wavelengths, and the first stacked polarizers are provided between a first pair of protective layers arranged such that no protective layer is located between the first stacked polarizers, and the second stacked polarizers are provided between a second pair of protective layers. - View Dependent Claims (9, 10)
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11. A display device comprising:
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a first light-transmitting substrate and a second light-transmitting substrate which are disposed to face each other; a display element sandwiched between the first light-transmitting substrate and the second light-transmitting substrate; a first layer including first stacked polarizers on an outer side of the first light-transmitting substrate; and a second layer including second stacked polarizers on an outer side of the second light-transmitting substrate, wherein; the first stacked polarizers are arranged so that their absorption axes are deviated from a parallel Nicols state, the second stacked polarizers are arranged so that their absorption axes are in a parallel Nicols state, the first layer including the first stacked polarizers has a first polarizer and a second polarizer which are sequentially stacked from the first light-transmitting substrate side, the first stacked polarizers and the second stacked polarizers are arranged so that their absorption axes are in a crossed Nicols state a distribution of a degree to which a first one of the first stacked polarizers absorbs light across a first band of wavelengths differs from a distribution of a degree to which a second one of the first stacked polarizers absorbs light across the first band of wavelengths, a distribution of a degree to which a first one of the second stacked polarizers absorbs light across a second band of wavelengths differs from a distribution of a degree to which a second one of the second stacked polarizers absorbs light across the second band of wavelengths, and the first stacked polarizers are provided between a first pair of protective layers arranged such that no protective layer is located between the first stacked polarizers, and the second stacked polarizers are provided between a second pair of protective layers. - View Dependent Claims (12, 13)
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14. A display device comprising:
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a first light-transmitting substrate and a second light-transmitting substrate which are disposed to face each other; a display element sandwiched between the first light-transmitting substrate and the second light-transmitting substrate; a first layer including first stacked polarizers on an outer side of the first light-transmitting substrate; a second layer including second stacked polarizers on an outer side of the second light-transmitting substrate; a first retardation plate between the first light-transmitting substrate and the first layer including the first stacked polarizers; a second retardation plate between the second light-transmitting substrate and the second layer including the second stacked polarizers, wherein; the first stacked polarizers are arranged so that their absorption axes are deviated from a parallel Nicols state, the second stacked polarizers are arranged so that their absorption axes are in a parallel Nicols state, the first layer including the first stacked polarizers has a first polarizer and a second polarizer which are sequentially stacked from the first light-transmitting substrate side, the first stacked polarizers and the second stacked polarizers are arranged so that their absorption axes are in a crossed Nicols states a distribution of a degree to which a first one of the first stacked polarizers absorbs light across a first band of wavelengths differs from a distribution of a degree to which a second one of the first stacked polarizers absorbs light across the first band of wavelengths, a distribution of a degree to which a first one of the second stacked polarizers absorbs light across a second band of wavelengths differs from a distribution of a degree to which a second one of the second stacked polarizers absorbs light across the second band of wavelengths, and the first stacked polarizers are provided between a first pair of protective layers arranged such that no protective layer is located between the first stacked polarizers, and the second stacked polarizers are provided between a second pair of protective layers. - View Dependent Claims (15, 16)
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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, Nishi, Takeshi, Ishitani, Tetsuji
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Primary Examiner(s)Heyman; John
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Application NumberUS11/626,115Publication NumberTime in Patent Office1,239 DaysField of Search349 96-106US Class Current349/96CPC Class CodesG02F 1/133531 characterised by the arrang...G02F 1/133533 Colour selective polarisers...G02F 1/13363 Birefringent elements, e.g....G02F 2203/04 wavelength independentG02F 2203/64 Normally black display, i.e...
