Display device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsTetsuji Ishitani, Yuji Egi, Takeshi Nishi
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Abstract
An object of the invention is to provide a display device having a high contrast ratio by a simple and easy method. 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, polarizing plates each having an extinction coefficient of an absorption axis which is different from that of an absorption axis of another polarizing plate are stacked to be provided. At that time, the stacked polarizing plates are arranged so as to be in a parallel nicol state. A wave plate and a retardation film may be provided between the stacked polarizing plates and the substrates.
Claims24
A display device comprising:
- a display element sandwiched between a first light-transmissive substrate and a second light-transmissive substrate which are provided so as to face each other;
- and
- stacked polarizing plates outside the first light-transmissive substrate or the second light- transmissive substrate,
- wherein each of the stacked polarizing plates has an extinction coefficient of an absorption axis which is different from that of an absorption axis of another polarizing plate, and absorption axes of the stacked polarizing plates are in a parallel nicol state, and
- wherein each of the stacked polarizing plates includes iodine.
A display device comprising:
- a display element sandwiched between a first light-transmissive substrate and a second light-transmissive substrate which are provided so as to face each other;
- a retardation film outside the first light-transmissive substrate or the second light- transmissive substrate;
- and
- stacked polarizing plates outside the retardation film,
- wherein each of the stacked polarizing plates has an extinction coefficient of an absorption axis which is different from that of an absorption axis of another polarizing plate, and absorption axes of the stacked polarizing plates are in a parallel nicol state, and
- wherein each of the stacked polarizing plates includes iodine.
A display device comprising:
- a display element sandwiched between a first light-transmissive substrate and a second light-transmissive substrate which are provided so as to face each other;
- first stacked polarizing plates outside the first light-transmissive substrate;
- and
- second stacked polarizing plates outside the second light-transmissive substrate,
- wherein each of the first stacked polarizing plates has an extinction coefficient of an absorption axis which is different from that of an absorption axis of another polarizing plate, and absorption axes of the first stacked polarizing plates are in a parallel nicol state,
- wherein each of the second stacked polarizing plates has an extinction coefficient of an absorption axis which is different from that of an absorption axis of another polarizing plate, and absorption axes of the second stacked polarizing plates are in a parallel nicol state, and
- wherein each of the first and second stacked polarizing plates includes iodine.
A display device comprising:
- a display element sandwiched between a first light-transmissive substrate and a second light-transmissive substrate which are provided so as to face each other;
- a first retardation film outside the first light-transmissive substrate;
- a second retardation film outside the second light-transmissive substrate;
- first stacked polarizing plates outside the first retardation film;
- and
- second stacked polarizing plates outside the second retardation film,
- wherein each of the first stacked polarizing plates has an extinction coefficient of an absorption axis which is different from that of an absorption axis of another polarizing plate, and absorption axes of the first stacked polarizing plates are in a parallel nicol state,
- wherein each of the second stacked polarizing plates has an extinction coefficient of an absorption axis which is different from that of an absorption axis of another polarizing plate, and absorption axes of the second stacked polarizing plates are in a parallel nicol state, and
- wherein each of the first and second stacked polarizing plates includes iodine.
Dependencies are inferred from the claim text.