Image display apparatus

Patent metadata

Field	Value
Publication number	US-9508291-B2
Application number	US-201213728675-A
Country	US
Kind code	B2
Filing date	Dec 27, 2012
Priority date	Dec 28, 2011
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

An image display apparatus according to the present disclosure includes: an image display panel; a backlight device; a first optical element located between the image display panel and the backlight device and configured to deflect a light incident thereon; a second optical element located between the first optical element and the image display panel and configured to change a deflection angle of emitted light according to a voltage applied thereto; a plurality of first lenses located between the first optical element and the backlight device; a plurality of second lenses located between the second optical element and the image display panel; a position detection section configured to detect a viewing position of a viewer; and a control section configured to control the voltage applied to the second optical element, according to the detected viewing position. The first lenses and the second lenses constitute an afocal optical system.

First claim

What is claimed is:

1. An image display apparatus comprising:
an image display panel for displaying images in response to image signals;
a backlight device located on a back surface side of the image display panel;
a first optical element located between the image display panel and the backlight device and configured to deflect a light incident thereon as the light passes through the first optical element;
a second optical element located between the first optical element and the image display panel and configured to further deflect the light deflected by the first optical element as the light passes through the second optical element and to change a deflection angle of emitted light according to a voltage applied thereto;
a plurality of first lenses, which are lenticular lenses, located between the first optical element and the backlight device;
a plurality of second lenses, which are lenticular lenses, located between the second optical element and the image display panel;
a position detector configured to detect a viewing position of a viewer; and
a controller electrically coupled to the second optical element and configured to control the voltage applied to the second optical element, according to the viewing position detected by the position detector, wherein:
the plurality of first lenses and the plurality of second lenses constitute an afocal optical system, and
the second optical element includes liquid crystal and is configured to change a refractive index by the voltage applied thereto.

2. The image display apparatus according to claim 1 , wherein:
each of the plurality of first lenses and each of the plurality of second lens are located so as to correspond to each other, and
each of the plurality of first lens is located such that an optical axis of the each of the plurality of first lenses is offset on a lateral side with respect to an optical axis of each of the plurality of second lenses in a region on a lateral side of the image display panel more than in a region at a center of the image display panel.

3. The image display apparatus according to claim 1 , wherein
each of the plurality of first lenses has positive optical power, and
each of the plurality of second lens lenses negative optical power.

4. The image display apparatus according to claim 1 , wherein the plurality of first lenses and the plurality of second lenses have positive optical power.

5. An image display apparatus comprising:
an image display panel for displaying images in response to image signals;
a backlight device located on a back surface side of the image display panel;
a first optical element located between the image display panel and the backlight device and configured to deflect a light incident thereon;
a second optical element located between the first optical element and the image display panel and configured to further deflect the light deflected by the first optical element and to change a deflection angle of emitted light according to a voltage applied thereto;
a plurality of first lenses located between the first optical element and the backlight device;
a plurality of second lenses located between the second optical element and the image display panel;
a position detector configured to detect a viewing position of a viewer; and
a controller configured to control the voltage applied to the second optical element, according to the viewing position detected by the position detector, wherein:
the plurality of first lenses and the plurality of second lenses constitute an afocal optical system,
an image signal for right eye and an image signal for left eye to which a parallax is provided are alternately inputted into the image display panel in a time division manner,
the backlight device includes:
a light guide plate having a pair of side surfaces and configured to guide light incident on the side surfaces, to an exit surface;
a first light source located so as to face one of side surfaces and configured to emit illumination light for displaying an image for right eye;
a second light source located so as to face another of the side surfaces and configured to emit illumination light for displaying an image for left eye; and
a light control sheet configured to deflect the light emitted from the first light source and the second light source toward ahead of a center of the image display panel, and

the first light source and the second light source alternately light up in synchronization with switching between the image signal for right eye and the image signal for left eye.

6. The image display apparatus according to claim 1 , wherein the image display panel is a liquid crystal display panel.

7. The image display apparatus according to claim 1 , wherein the plurality of first lenses are disposed on a first substrate.

8. The image display apparatus according to claim 1 , wherein the plurality of second lenses are disposed on a second substrate.

9. An image display apparatus comprising:
an image display panel for displaying images in response to image signals;
a backlight device located on a back surface side of the image display panel;
a first optical element located between the image display panel and the backlight device and configured to deflect a light incident thereon;
a second optical element located between the first optical element and the image display panel and configured to further deflect the light deflected by the first optical element and to change a deflection angle of emitted light according to a voltage applied thereto;
a plurality of first lenses located between the first optical element and the backlight device;
a plurality of second lenses located between the second optical element and the image display panel;
a position detector configured to detect a viewing position of a viewer; and
a controller configured to control the voltage applied to the second optical element, according to the viewing position detected by the position detector, wherein:
the plurality of first lenses and the plurality of second lenses constitute an afocal optical system,
an image signal for right eye and an image signal for left eye to which a parallax is provided are alternately inputted into the image display panel in a time division manner,
the backlight device includes:
a first light source configured to emit illumination light for displaying an image for right eye; and
a second light source configured to emit illumination light for displaying an image for left eye, and

the first light source and the second light source alternately light up in synchronization with switching between the image signal for right eye and the image signal for left eye.

10. The image display apparatus according to claim 1 , wherein:
the first optical element includes plural first prisms, and
the second optical element includes plural second prisms.

Assignees

• Panasonic Corp
• Panasonic Ip Man Co Ltd

Inventors

• Tanaka Yasuhiro
• Hayashi Katsuhiko
• Kasano Masahiro
• Ichihashi Kouki

Classifications

• G09G3/3406 Primary

  Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336) · CPC title

• G02B30/27

  involving lenticular arrays · CPC title

• H04N13/366

  using viewer tracking · CPC title

• H04N13/32

  using arrays of controllable light sources; using moving apertures or moving light sources · CPC title

• G02B30/24 Primary

  involving temporal multiplexing, e.g. using sequentially activated left and right shutters · CPC title