Liquid crystal device and electronic apparatus using the same having two absorptive polarizers, a reflective polarizer, and a backlight
First Claim
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1. A liquid crystal device that modulates light responsive to given image signals, comprising:
- a first absorptive polarizer configured to receive light from outside;
a liquid crystal cell configured to receive light emitted from the first absorptive polarizer;
a second absorptive polarizer configured to receive light emitted from the liquid crystal cell; and
a reflective polarizer configured to receive light emitted from the second absorptive polarizer, wherein the reflective polarizer has an axis of reflection in a predetermined direction to reflect at least part of light transmitted through the first absorptive polarizer, the liquid crystal cell, and the second absorptive polarizer to be incident on the reflective polarizer, and the reflective polarizer partially transmits light including a linearly polarized light component which is included in light entering the reflective polarizer from an opposite side to a side facing the second absorptive polarizer to be transmitted through the second absorptive polarizer, and wherein the first absorptive polarizer has an axis of transmission in a specific direction to cause light reflected by the reflective polarizer and transmitted through the second absorptive polarizer to be transmitted through the first absorptive polarizer, said liquid crystal device further comprising;
a backlight disposed on the opposite side of the reflective polarizer, wherein light emitted from the backlight is adjusted to have a color other than white in order to cause color of a first light to be close to color of a second light, the first light being one that is emitted from the backlight and transmitted through the reflective polarizer, the second absorptive polarizer, the liquid crystal cell, and the first absorptive polarizer, the second light being the one from the outside transmitted through the first absorptive polarizer, the liquid crystal cell, and the second absorptive polarizer, subsequently reflected by the reflective polarizer, then transmitted through the second absorptive polarizer, the liquid crystal cell, and the first absorptive polarizer.
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Abstract
The liquid crystal device of the present invention effectively prevents reversion of bright/dark states between a reflective display mode and a transmissive display mode. The liquid crystal device includes a first absorptive polarizer, which receives light from outside; a liquid crystal cell, which receives light emitted from the first absorptive polarizer; a second absorptive polarizer, which receives light emitted from the liquid crystal cell; and a reflective polarizer, which receives light emitted from the second absorptive polarizer. The reflective polarizer has an axis of reflection in a predetermined direction to reflect at least part of light that has been transmitted through the first absorptive polarizer, the liquid crystal cell, and the second absorptive polarizer to be incident on the reflective polarizer. The reflective polarizer partially transmits light including a linearly polarized light component which is included in light entering the reflective polarizer from an opposite side to the second absorptive polarizer and which is to be transmitted through the second absorptive polarizer. The first absorptive polarizer has an axis of transmission in a specific direction to cause light, which has been reflected by the reflective polarizer and transmitted through the second absorptive polarizer, to be transmitted through the first absorptive polarizer.
141 Citations
4 Claims
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1. A liquid crystal device that modulates light responsive to given image signals, comprising:
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a first absorptive polarizer configured to receive light from outside;
a liquid crystal cell configured to receive light emitted from the first absorptive polarizer;
a second absorptive polarizer configured to receive light emitted from the liquid crystal cell; and
a reflective polarizer configured to receive light emitted from the second absorptive polarizer, wherein the reflective polarizer has an axis of reflection in a predetermined direction to reflect at least part of light transmitted through the first absorptive polarizer, the liquid crystal cell, and the second absorptive polarizer to be incident on the reflective polarizer, and the reflective polarizer partially transmits light including a linearly polarized light component which is included in light entering the reflective polarizer from an opposite side to a side facing the second absorptive polarizer to be transmitted through the second absorptive polarizer, and wherein the first absorptive polarizer has an axis of transmission in a specific direction to cause light reflected by the reflective polarizer and transmitted through the second absorptive polarizer to be transmitted through the first absorptive polarizer, said liquid crystal device further comprising;
a backlight disposed on the opposite side of the reflective polarizer, wherein light emitted from the backlight is adjusted to have a color other than white in order to cause color of a first light to be close to color of a second light, the first light being one that is emitted from the backlight and transmitted through the reflective polarizer, the second absorptive polarizer, the liquid crystal cell, and the first absorptive polarizer, the second light being the one from the outside transmitted through the first absorptive polarizer, the liquid crystal cell, and the second absorptive polarizer, subsequently reflected by the reflective polarizer, then transmitted through the second absorptive polarizer, the liquid crystal cell, and the first absorptive polarizer. - View Dependent Claims (2)
a light source; and
a color filter that adjusts color of light emitted from the light source.
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3. An electronic apparatus comprising:
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a display device, the display device including, a first absorptive polarizer configured to receive light from outside, a liquid crystal cell configured to receive light emitted from the first absorptive polarizer, a second absorptive polarizer configured to receive light emitted from the liquid crystal cell, and a reflective polarizer configured to receive light emitted from the second absorptive polarizer, wherein the reflective polarizer has an axis of reflection in a predetermined direction to reflect at least part of light transmitted through the first absorptive polarizer, the liquid crystal cell, and the second absorptive polarizer to be incident on the reflective polarizer, and the reflective polarizer partially transmits light including a linearly polarized light component which is included in light entering the reflective polarizer from an opposite side to a side facing the second absorptive polarizer to be transmitted through the second absorptive polarizer, and wherein the first absorptive polarizer has an axis of transmission in a specific direction to cause light reflected by the reflective polarizer and transmitted through the second absorptive polarizer to be transmitted through the first absorptive polarizer, the display device further comprising, a backlight disposed on the opposite side of the reflective polarizer, wherein light emitted from the backlight is adjusted to have a color other than white in order to cause color of a first light to be close to color of the second light, the first light being one that is emitted from the backlight and transmitted through the reflective polarizer, the second absorptive polarizer, the liquid crystal cell, and the first absorptive polarizer, the second light being the one from the outside transmitted through the first absorptive polarizer, the liquid crystal cell, and the second absorptive polarizer, subsequently reflected by the reflective polarizer, then transmitted through the second absorptive polarizer the liquid crystal cell, and the first absorptive polarizer. - View Dependent Claims (4)
a light source; and
a color filter that adjusts color of light emitted from the light source.
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Specification
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Current AssigneeBOE Technology Group Co., Ltd.
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Original AssigneeSeiko Epson Corporation (Seiko Group)
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InventorsTsuda, Atsunari, Kuroiwa, Masahiro, Miwa, Naonori
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Primary Examiner(s)Malinowski, Walter J.
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Application NumberUS09/300,457Time in Patent Office930 DaysField of Search349/71, 349/70, 349/96, 349/106, 349/104, 349/98US Class Current349/96CPC Class CodesG02F 1/133536 Reflective polarizers G02F1...G02F 1/13362 providing polarized light, ...G02F 2203/02 reflective
