Polarizing plate, method for manufacturing polarizing plate, image display device, method for manufacturing image display device, and method for improving transmittance of polarizing plate
US-2016209564-A1 · Jul 21, 2016 · US
Method for improving visibility of liquid crystal display device, and liquid crystal display device using same
US10054816B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10054816-B2 |
| Application number | US-201013509211-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 11, 2010 |
| Priority date | Nov 12, 2009 |
| Publication date | Aug 21, 2018 |
| Grant date | Aug 21, 2018 |
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- Title
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Abstract
Official abstract text for this publication.
The present invention provides a liquid crystal display method capable of, when a screen thereof is observed through a polarizer such as sunglasses, ensuring an excellent visibility regardless of the angle of observation. In a liquid crystal display device at least having a backlight light source, a liquid crystal cell, and a polarizer disposed on a viewing side of the liquid crystal cell, a white light-emitting diode is used as the backlight light source; and a polymer film having a retardation of from 3,000 nm to 30,000 nm is used so as to be disposed on the viewing side of the polarizer so that an angle between an absorption axis of the polarizer and a slow axis of the polymer film becomes about 45 degrees.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method of preparing a liquid crystal display device comprising (a) providing a backlight light source, a liquid crystal cell, a polarizer, and an oriented polyethylene terephthalate film, (b) disposing the polarizer on a viewing side of the liquid crystal cell, and (c) disposing the oriented polyethylene terephthalate film on a viewing side of the polarizer, wherein the backlight light source is a white light source having a continuous emission spectrum, the oriented polyethylene terephthalate film has a retardation of 3,000 nm or more and less than 10,000 nm, the range of the angle between the absorption axis of the polarizer and the slow axis of the oriented polyethylene terephthalate film is from 30 to 60 degrees, and the oriented polyethylene terephthalate film has a property that, when the light from the backlight light source enters into crossed nicols wherein the oriented polyethylene terephthalate film is disposed in a diagonal position between the crossed nicols, the envelope curve shape of the spectrum of the transmitted light through the crossed nicols and the oriented polyethylene terephthalate film is similar to, and preserves, the shape of the emission spectrum of the backlight light source. 2. The method according to claim 1 , wherein the white light source is a light-emitting device comprising a combination of an yttrium-aluminum-garnet yellow phosphor with a blue light-emitting diode using a compound semiconductor. 3. The method according to claim 1 , wherein the oriented polyethylene terephthalate film is an uniaxially-stretched polyethylene terephthalate film. 4. A liquid crystal display device comprising (a) a backlight light source, (b) a liquid crystal cell, (c) a polarizer disposed on a viewing side of the liquid crystal cell, and (d) an oriented polyethylene terephthalate film disposed on a viewing side of the polarizer, wherein the backlight light source is a white light source having a continuous emission spectrum, the oriented polyethylene terephthalate film has a retardation of 3,000 nm or more and less than 10,000 nm, the range of the angle between the absorption axis of the polarizer and the slow axis of the oriented polyethylene terephthalate film is from 30 to 60 degrees, and the oriented polyethylene terephthalate film has a property that, when the light from the backlight light source enters into crossed nicols wherein the oriented polyethylene terephthalate film is disposed in a diagonal position between the crossed nicols, the envelope curve shape of the spectrum of the transmitted light through the crossed nicols and the oriented polyethylene terephthalate film is similar to, and preserves, the shape of the emission spectrum of the backlight light source.
Assignees
Inventors
Classifications
Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001) · CPC title
Materials having a particular birefringence, retardation · CPC title
Birefringent elements, e.g. for optical compensation · CPC title
- G02F1/133528Primary
Polarisers · CPC title
with LEDs · CPC title
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Frequently asked questions
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- What does patent US10054816B2 cover?
- The present invention provides a liquid crystal display method capable of, when a screen thereof is observed through a polarizer such as sunglasses, ensuring an excellent visibility regardless of the angle of observation. In a liquid crystal display device at least having a backlight light source, a liquid crystal cell, and a polarizer disposed on a viewing side of the liquid crystal cell, a wh…
- Who is the assignee on this patent?
- Koike Yasuhiro, Tagaya Akihiro, Toyo Boseki, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification G02F1/133528. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Aug 21 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).