IP Library Granted Patent US 8,081,274
Granted Patent B2
US 8,081,274 · App. 12/122,317 · Granted Dec 20, 2011

Liquid crystal device having a first polarizing element deviated up to a range of plus or minus 1 degree relative to a Y axis of a second polarizing element

View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 8,081,274
App. No.
12/122,317
Granted
Dec 20, 2011
Kind
B2
Abstract

A liquid crystal device includes a first substrate and a second substrate that are disposed to face each other, a first electrode and a second electrode that are disposed on a surface, which faces the second substrate, of the first substrate, a liquid crystal layer that is disposed between the first substrate and the second substrate and has liquid crystal molecules aligned in a direction parallel to the first substrate, and a pair of polarizing elements having the liquid crystal layer interposed therebetween. The liquid crystal molecules are driven by an electric field that is generated by an electric potential difference between the first electrode and the second electrode and has a component parallel to the first substrate, and the retardation of the liquid crystal layer is equal to or larger than 0.66 λ and is equal to or smaller than 0.83 λ for light having a wavelength λ of 555 nm.

Claims (29)

1. A liquid crystal device comprising:

a first substrate and a second substrate that are disposed to face each other;

a first electrode and a second electrode that are disposed on a surface, which faces the second substrate, of the first substrate;

a liquid crystal layer that is disposed between the first substrate and the second substrate and has liquid crystal molecules aligned in a direction parallel to the first substrate; and

a pair of polarizing elements having the liquid crystal layer interposed therebetween, wherein

the first electrode and the second electrode are adapted to generate an electric field having a component parallel to the first substrate when a potential difference exists between the first electrode and the second electrode, the electric field adapted to drive the liquid crystal molecules,

the first electrode and the second electrode have portions forming comb-teeth shapes, that are formed in a same layer, and are disposed to face each other such that the portions forming the comb-teeth shapes are alternately disposed,

a retardation of the liquid crystal layer is about 0.75λ for light having a wavelength λ of 555 nm, the retardation of the liquid crystal layer selected to produce a minimum loss of contrast independent of an accuracy of alignment of an orientation of the pair of polarizing elements,

wherein the liquid crystal device has a contrast higher than 600 when the transmission axes of the polarizing elements are deviated up to a range of plus or minus 1 degree, and

wherein when one or both of the polarizing elements are deviated, the contrast decreases to the at least substantially the same degree irrespective of the direction of deviation of the polarizing elements, and

wherein when a first one of the polarizing elements is deviated up to a range of plus or minus 1 degree relative to a Y axis of a second one of the polarizing elements, the light passing through the liquid crystal layer is elliptically polarized light having a major axis which is parallel to the Y axis.

2. An electronic apparatus comprising the liquid crystal device according to claim 1 .

3. A liquid crystal device comprising:

a first substrate and a second substrate that are disposed to face each other;

a first electrode and a second electrode that are disposed on a surface, which faces the second substrate, of the first substrate;

a liquid crystal layer that is disposed between the first substrate and the second substrate and has liquid crystal molecules aligned in a direction parallel to the first substrate; and

a pair of polarizing elements having the liquid crystal layer interposed therebetween, wherein

the first electrode and the second electrode are adapted to generate an electric field having a component parallel to the first substrate when a potential difference exists between the first electrode and the second electrode, the electric field adapted to drive the liquid crystal molecules,

the first electrode is disposed between the second electrode and the liquid crystal layer, the first electrode comprising a plurality of through-holes, enclosed by the first electrode adapted to allow electric field from the second electrode to reach the liquid crystal layer,

a retardation of the liquid crystal layer is about 0.75λ for light having a wavelength λ of 555 nm, the retardation of the liquid crystal layer selected to produce a minimum loss of contrast independent of an accuracy of alignment of an orientation of the pair of polarizing elements,

wherein the liquid crystal device has a contrast higher than 600 when the transmission axes of the polarizing elements are deviated up to a range of plus or minus 1 degree, and

wherein when one or both of the polarizing elements are deviated, the contrast decreases to the at least substantially the same degree irrespective of the direction of deviation of the polarizing elements, and

wherein when a first one of the polarizing elements is deviated up to a range of plus or minus 1 degree relative to a Y axis of a second one of the polarizing elements, the light passing through the liquid crystal layer is elliptically polarized light having a major axis which is parallel to the Y axis.

4. The liquid crystal device according to claim 1 , wherein a thickness of the liquid crystal layer is about 3.7 μm.

5. The liquid crystal device according to claim 1 , wherein the refractive anisotropy of the liquid crystal molecules is about 0.10.

6. The liquid crystal device according to claim 1 , wherein the liquid crystal device has a contrast higher than 700 when the transmission axes of the polarizing elements are deviated up to a range of plus or minus 1 degree.

7. The liquid crystal device according to claim 3 , wherein a thickness of the liquid crystal layer is about 3.7 μm.

8. The liquid crystal device according to claim 3 , wherein the refractive anisotropy of the liquid crystal molecules is about 0.10.

9. The liquid crystal device according to claim 3 , wherein the liquid crystal device has a contrast higher than 700 when the transmission axes of the polarizing elements are deviated up to a range of plus or minus 1 degree.

Assignments (3)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 8, 2013
From: SONY CORPORATION
To: JAPAN DISPLAY WEST INC.
Reel/Frame 031377/0942 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 8, 2010
From: SEIKO EPSON CORPORATION
To: SONY CORPORATION
Reel/Frame 024503/0331 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 16, 2008
From: TOMIKAWA, NAOKI
To: SEIKO EPSON CORPORATION
Reel/Frame 020960/0722 →