JP2009145862A5

JP2009145862A5 -

Info

Publication number: JP2009145862A5
Application number: JP2008186352A
Authority: JP
Filing date: 2008-07-17
Publication date: 2011-08-11
Anticipated expiration: 2028-07-17

Claims

A liquid crystal panel that modulates light by sandwiching a vertical alignment type liquid crystal composed of liquid crystal molecules provided with a pretilt by the alignment film between a pair of substrates each having an alignment film;
A pair of polarizing plates disposed across the liquid crystal panel;
A first retardation plate that is disposed between the pair of polarizing plates, maintains a first refractive index anisotropy, and has a first optical axis of the first refractive index anisotropy along a thickness direction;
The second optical axis of the second refractive index anisotropy is retained by the pretilt and (i) the first substrate and (ii) the second refractive index anisotropy are disposed between the pair of polarizing plates. A second retardation plate having a deposited film obliquely deposited on the first substrate so as to incline in a direction that cancels the characteristic change of light ,
The liquid crystal device , wherein the second retardation plate is rotatable with a normal direction of the second retardation plate as a rotation axis .

The thickness of the first retardation plate and the refractive index in the thickness direction of the first retardation plate are viewed from the front of one polarizing plate located on the light emission side of the pair of polarizing plates. 2. The liquid crystal according to claim 1, wherein the phase difference is set to be 20 (nm: nanometer) or less when the polar angle indicating the angle of the line of sight when the angle is set to 0 degree is 30 degrees. apparatus.

The liquid crystal device according to claim 1, wherein the second refractive index anisotropy is biaxial.

In the second refractive index anisotropy, when the second optical axis is the X axis, the refractive index in the X axis direction is larger than the refractive index in the Y axis direction, and the refractive index in the Y axis direction is the Z axis. 4. The liquid crystal device according to claim 1, wherein the liquid crystal device has a magnitude relationship of greater than a refractive index in a direction.

2. The second retardation plate is disposed so as to be closer to the liquid crystal panel than a side on which the first substrate is provided compared to a side on which the first substrate is not provided. 5. The liquid crystal device according to any one of items 1 to 4.

The second retardation plate is disposed so that the side on which the first substrate is provided is closer to one of the pair of polarizing plates than the side on which the first substrate is not provided. The liquid crystal device according to claim 1, wherein the liquid crystal device is a liquid crystal device.

The liquid crystal device according to claim 1, wherein the first retardation plate is disposed at a position farther from the liquid crystal panel than the second retardation plate. .

A pair of transmission axes of the pair of polarizing plates are orthogonal to each other, and each form an angle of 45 degrees with the major axis direction of the liquid crystal molecules provided with the pretilt when viewed from the normal direction of the first substrate,
8. The liquid crystal device according to claim 1, wherein, in the second retardation plate, the second optical axis is along one direction of the pair of transmission axes. 9.

The liquid crystal device according to claim 1, wherein the vapor deposition film includes an inorganic material.

A liquid crystal panel that modulates light by sandwiching a vertical alignment type liquid crystal composed of liquid crystal molecules provided with a pretilt by the alignment film between a pair of substrates each having an alignment film;
A pair of polarizing plates disposed across the liquid crystal panel;
It is disposed between the pair of polarizing plates, and (i) a first substrate, (ii) a first refractive index anisotropy is maintained, and a first optical axis of the first refractive index anisotropy is in a thickness direction. And (iii) a second optical axis of the second refractive index anisotropy while maintaining the second refractive index anisotropy and the second optical axis of the second refractive index anisotropy by the pretilt. A liquid crystal device comprising: a retardation plate having a second vapor deposition film obliquely vapor-deposited on the first vapor deposition film so as to incline in a direction that cancels a change in light characteristics.

A liquid crystal device according to any one of claims 1 to 10,
A light source that emits the light;
A projector comprising: a projection optical system that projects the modulated light.

An optical compensation method for performing optical compensation in the liquid crystal device according to claim 1,
A first optical adjustment step of rotating the second retardation plate about the normal direction of the second retardation plate as a rotation axis;
A second optical adjustment step of rotating at least one of the pair of polarizing plates about the normal direction as a rotation axis. An optical compensation method for a liquid crystal device, comprising:

An optical compensation method for performing optical compensation in the liquid crystal device according to claim 10,
A first optical adjustment step of rotating the retardation plate with the normal direction of the retardation plate as a rotation axis;
A second optical adjustment step of rotating at least one of the pair of polarizing plates about the normal direction as a rotation axis. An optical compensation method for a liquid crystal device, comprising:

A vertical alignment type liquid crystal composed of liquid crystal molecules given a pretilt by the alignment film is sandwiched between a pair of substrates each having an alignment film, and a liquid crystal panel for modulating light and the liquid crystal panel are sandwiched between A phase difference plate used together with a pair of polarizing plates disposed between the pair of polarizing plates,
(i) a first substrate;
(ii) a first vapor-deposited film that is vertically vapor-deposited on the first substrate so as to maintain the first refractive index anisotropy and so that the first optical axis of the first refractive index anisotropy is along the thickness direction; ,
(iii) On the first vapor deposition film, the second refractive index anisotropy is maintained and the second optical axis of the second refractive index anisotropy is inclined in a direction to cancel the change in the characteristic of the light due to the pretilt. And a second vapor-deposited film deposited obliquely.

A liquid crystal panel that modulates light by sandwiching a vertical alignment type liquid crystal composed of liquid crystal molecules provided with a pretilt by the alignment film between a pair of substrates each having an alignment film;
A pair of polarizing plates disposed across the liquid crystal panel;
It is disposed between the pair of polarizing plates, and (i) a first substrate, (ii) a first refractive index anisotropy is maintained, and a first optical axis of the first refractive index anisotropy is in a thickness direction. And (iii) a second optical axis of the second refractive index anisotropy while maintaining the second refractive index anisotropy and the pre-tilt And a retardation plate having a second vapor deposition film obliquely vapor-deposited on the other side of the first substrate so as to incline in a direction that cancels the change in the characteristic of the light due to the liquid crystal.

In addition to or instead of the film thickness of the second vapor deposition film, the vapor deposition angle, which is an angle at which the second vapor deposition film is obliquely vapor deposited, is (i) a front direction as viewed from the light emitting side of the retardation plate In addition to being set so that the front phase difference that is the phase difference of the first phase is within the first predetermined range, (ii) the direction different from the normal direction of the phase difference plate and the direction in which the vapor deposition film is obliquely vapor deposited From a first direction along the vapor deposition direction, a first phase difference that occurs when the light is incident, and a second direction that is symmetrical to the first direction with respect to the normal direction, 16. The liquid crystal device according to claim 10, wherein a ratio with a second phase difference generated when the light is incident is set to be within a second predetermined range.

The film thickness and the deposition angle are: (i) Contrast change with respect to a unit change amount of the rotation angle when the retardation plate is rotated with the normal direction as a rotation axis as the front phase difference increases. In addition to or instead of being set to increase the amount, (ii) as the front phase difference decreases, the amount of change in contrast with respect to the unit change amount is set to decrease. The liquid crystal device according to claim 16.

18. The first vapor deposition film according to claim 10, wherein the first vapor deposition film is disposed farther from the liquid crystal panel than the second vapor deposition film. Liquid crystal device.