Liquid crystal display unit and projection-type display

Patent metadata

Field	Value
Publication number	US-9470918-B2
Application number	US-201213595901-A
Country	US
Kind code	B2
Filing date	Aug 27, 2012
Priority date	Sep 2, 2011
Publication date	Oct 18, 2016
Grant date	Oct 18, 2016

Abstract

There is provided a liquid crystal display unit including a liquid crystal panel for modulating light; a light shielding plate for controlling light not to be incident on areas other than an effective pixel area of the liquid crystal panel; an optical compensation element arranged at sides on which the light is incident in the liquid crystal panel and the light shielding plate; and an optical compensation element holder for holding the optical compensation element to be spaced from the light shielding plate and not to contact other members.

First claim

What is claimed is:

1. A liquid crystal display unit comprising:
a liquid crystal panel configured to modulate light incident thereon via an incident light path;
a light shielding plate disposed in the incident light path and having a window aligned with an effective pixel area of the liquid crystal panel and configured to control light such that the light passes through the area of the window to be incident on the effective pixel area of the liquid crystal panel and light outside the area of the window is not incident on areas of the liquid crystal panel other than the effective pixel area of the liquid crystal panel;
an optical compensation element arranged in the incident light path at which the light is incident on the liquid crystal panel and the light shielding plate; and
an optical compensation element holder configured to hold the optical compensation element at an area of the optical compensation element that extends outside the window area and at which incident light does not pass through the optical compensation element, such that the optical compensation element is spaced from the light shielding plate.

2. The liquid crystal display unit according to claim 1 ,
wherein the light shielding plate includes a main surface portion and stepped surface portions arranged in positions estranged from the liquid crystal panel as compared to the main surface portion to support the main surface portion, and
wherein the optical compensation element holder includes a holding portion for holding the optical compensation element, and a support piece arranged in a position estranged from the liquid crystal panel as compared to the main surface portion to support the holding portion.

3. The liquid crystal display unit according to claim 1 , further comprising a pre-light-shielding plate provided at a side on which the light is incident on the optical compensation element,
wherein the optical compensation element holder holds the optical compensation element in a suspended state in a space formed by the pre-light-shielding plate and the light shielding plate.

4. The liquid crystal display unit according to claim 3 , further comprising:
a panel cover arranged around the liquid crystal panel to support the light shielding plate; and
a pre-light-shielding plate holder for supporting the pre-light-shielding plate,
wherein the light shielding plate is sandwiched between the panel cover and the pre-light-shielding plate holder.

5. The liquid crystal display unit according to claim 4 , wherein
the pre-light-shielding plate holder includes a pre-opening into which the optical compensation element holder that holds the optical compensation element is fitted and a gap is provided between the optical compensation element holder and the light shielding plate.

6. The liquid crystal display unit according to claim 4 , further comprising a packing between the pre-light-shielding plate and the pre-light-shielding plate holder and having an opening larger than the optical compensation element.

7. The liquid crystal display unit according to claim 1 , wherein
the optical compensation element holder includes a lever for rotating the optical compensation element about an optical axis.

8. A projection-type display device comprising:
a light source for outputting light; and
a liquid crystal display unit for modulating the light output from the light source and incident thereon via an incident light path,
wherein the liquid crystal display unit includes
a liquid crystal panel configured to modulate the light incident thereon,
a light shielding plate disposed in the incident light path and having a window aligned with an effective pixel area of the liquid crystal panel and configured to control the light such that the light passes through the area of the window to be incident on the effective pixel area of the liquid crystal panel and light outside the area of the window is not incident on areas of the liquid crystal panel other than the effective pixel area of the liquid crystal panel,
an optical compensation element arranged in the incident light path at which the light is incident on the liquid crystal panel and the light shielding plate, and
an optical compensation element holder configured to hold the optical compensation element at an area of the optical compensation element that extends outside the window area and at which incident light does not pass through the optical compensation element, such that the optical compensation element is spaced from the light shielding plate.

Assignees

• Aikoh Yoshihisa
• Sony Corp

Inventors

• Aikoh Yoshihisa

Classifications

• G03B21/006

  using LCD's · CPC title

• G02F1/13363

  Birefringent elements, e.g. for optical compensation · CPC title

• G02F1/133512 Primary

  Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence) · CPC title

• G02F1/133308 Primary

  Support structures for LCD panels, e.g. frames or bezels · CPC title

• H04N9/3167 Primary

  for polarizing the light beam (polarizing optical systems per se G02B27/28) · CPC title