JPH07181442A - Projection type liquid crystal display device - Google Patents

Abstract

PURPOSE:To provide a projection type liquid crystal display device capable of projecting and displaying a picture displayed on a liquid crystal display element even on an external screen such as a wall, etc., and capable of being used both in a back projection system and a front projection system. CONSTITUTION:A main body case 2 is formed of a lower case 10 and an upper case 11, and the upper case 11 is installed to be able to turn with respect to the lower case 10 so that image light from a projection unit 3 can be projected on the external screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type liquid crystal display device used as a large screen display device.

[0002]

2. Description of the Related Art Conventionally, a projection type liquid crystal display device called a liquid crystal projector is constructed so that an image displayed on a liquid crystal display element is enlarged by a projection lens and projected on a display screen of a main body case. .

Such a projection type liquid crystal display device can be used as a large screen display device because an image displayed on a liquid crystal display element is enlarged and displayed on a light transmission type screen forming a display screen of a main body case. It has the advantage that

[0004]

However, in the above-mentioned conventional projection type liquid crystal display device, the image displayed on the liquid crystal display element is projected on an external screen such as a wall other than the screen forming the display screen of the main body case. There was a problem that I could not see it.

The present invention has been made in view of the above problems, and an object thereof is to display an image displayed on a liquid crystal display device on an external screen such as a wall other than a screen forming a display screen of a main body case. The present invention is also intended to provide a projection type liquid crystal display device capable of projection display.

[0006]

In order to solve the above-mentioned problems, the present invention according to claim 1 forms a main body case with a lower case and an upper case, and the upper case is rotatable with respect to the lower case. The image light from the projection lens can be projected on the external screen.

According to a second aspect of the present invention, a back cover for closing an opening of the body case is provided on the back side of the body case so as to be openable and closable, and the liquid crystal display element and the projection lens are unitized to form a body case. It is characterized in that it can be rotated to the rear side.

According to a third aspect of the present invention, the projection lens is detachably attached to the main body case, and
It is characterized in that a second projection lens unit for projecting an image displayed on the liquid crystal display element onto an external screen is detachably attached to the main body case.

[0009]

According to the present invention, the image displayed on the liquid crystal display device can be projected and displayed on an external screen such as a wall, and the rear projection can be performed by one display device. Both system and front projection system can be used together.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 are views showing a first embodiment of the present invention,
The projection type liquid crystal display device according to the first example includes a light transmission type screen 1 as shown in FIG. The light-transmissive screen 1 forms the display screen of the present device, and is provided on the upper front surface of the main body case 2.

Further, the projection type liquid crystal display device according to this embodiment is provided with a projection unit 3 as shown in FIG.
The projection unit 3 is for projecting and displaying an image on the back surface of the light transmission type screen 1, and as shown in FIG. 2, a liquid crystal display element 4 and a projection lens for enlarging the image displayed on the liquid crystal display element 4. 5 and a backlight light source 6 for illuminating the liquid crystal display element 4 from the back side.

Polarizing plates 7 and 8 are provided on the light incident side and the light emitting side of the liquid crystal display element 4 so as to face the liquid crystal display element 4. Further, the projection type liquid crystal display device according to the present embodiment includes a mirror 9 as shown in FIG. The mirror 9 reflects the image light emitted from the projection unit 3 toward the light transmissive screen 1, and is attached to the ceiling portion of the main body case 2.

The body case 2 is, as shown in FIG.
It consists of a lower case 10 and an upper case 11, and the lower case 10
A plurality of hinge fittings 12 that rotatably support the upper case 11 with respect to the lower case 10 are provided on the upper end of the front surface of the.

In the first embodiment of the present invention configured as described above, when the upper case 11 is rotated toward the front side of the main body case 2 with the hinge metal fitting 12 provided at the upper end of the front surface of the lower case 10 as a fulcrum. As shown in FIG. 3, the upper portion of the main body case 2 is opened. Therefore, by directing the projection lens 5 of the projection unit 3 to an external screen such as a wall in this state, the image light emitted from the projection unit 3 is projected on the external screen, so that the image displayed on the liquid crystal display element 4 is displayed. It can be projected and displayed on an external screen such as a wall, and the rear projection system can be switched to the front projection system.

4 to 6 are views showing a second embodiment of the projection type liquid crystal display device according to the present invention. The projection type liquid crystal display device is provided with a light transmission type screen 1 as shown in FIG. ing. The light-transmissive screen 1 forms the display screen of the present device, and is provided on the upper front surface of the main body case 2.

Further, as shown in FIG. 4, the projection type liquid crystal display device according to this embodiment includes a projection unit 3 for projecting and displaying an image on the back surface of the light transmission type screen 1. As shown in FIG. 5, the projection unit 3 includes a unit body 1
3, a liquid crystal display element 4 provided in the unit main body 13, a projection lens 5 for enlarging an image displayed on the liquid crystal display element 4, and a backlight light source 6 for illuminating the liquid crystal display element 4 from the back side. Consists of the unit body 13
A support shaft 14 is provided in the lower part of the. This support shaft 1
Reference numeral 4 is a unit that supports the projection unit 3 so that it can be raised and lowered with respect to the main body case 2, and is rotatably held by a bearing portion 15 provided at the bottom of the main body case 2.

Polarizing plates 7 and 8 are provided on the light incident side and the light emitting side of the liquid crystal display element 4 so as to face the liquid crystal display element 4. Further, the projection type liquid crystal display device according to the present embodiment includes a mirror 9 as shown in FIG. The mirror 9 reflects the image light emitted from the projection unit 3 toward the light transmissive screen 1, and is attached to the ceiling portion of the main body case 2.

Further, the projection type liquid crystal display device according to this embodiment is provided with a back cover 16 as shown in FIG.
The back cover 16 closes an opening formed on the back side of the main body case 2, and is rotatable counterclockwise in the figure with a hinge metal fitting 17 provided at the upper edge of the opening as a fulcrum. Has become.

In the second embodiment of the present invention configured as described above, when the rear cover 16 is rotated counterclockwise in the figure with the hinge metal fitting 17 as a fulcrum, an opening formed on the rear surface side of the main body case 2. The department is opened. Next, when the unit main body 13 is rotated clockwise in the drawing with the support shaft 14 as a fulcrum in this state, the projection unit 3 falls to the rear side of the main body case 2 as shown in FIG. Therefore, by directing the projection lens 5 of the projection unit 3 to an external screen such as a wall in this state, the image light emitted from the projection unit 3 is projected onto the external screen such as a wall, and is displayed on the liquid crystal display element 4. The projected image can be projected and displayed on an external screen such as a wall, and the rear projection system can be switched to the front projection system.

7 to 9 are views showing a third embodiment of the projection type liquid crystal display device according to the present invention. The projection type liquid crystal display device is provided with a light transmission type screen 1 as shown in FIG. ing. The light-transmissive screen 1 forms the display screen of the present device, and is provided on the upper front surface of the main body case 2.

Further, the projection type liquid crystal display device according to this embodiment is provided with a projection unit 3 as shown in FIG.
The projection unit 3 is for projecting and displaying an image on the back surface of the light transmissive screen 1, and as shown in FIG. 8, a liquid crystal display element 4 and a projection lens for enlarging the image displayed on the liquid crystal display element 4. 5 and a backlight light source 6 for illuminating the liquid crystal display element 4 from the back side.

Polarizing plates 7 and 8 are provided on the light incident side and the light emitting side of the liquid crystal display element 4 so as to face the liquid crystal display element 4. Further, the projection type liquid crystal display device according to the present embodiment includes the first mirror 9. This first mirror 9
Is for reflecting the image light emitted from the projection unit 3 toward the light transmissive screen 1, and as shown in FIG. 7, the mirror body 18 provided on the ceiling of the body case 2 is
And a hinge portion 19 that supports the upper portion of the mirror body 18 so as to be rotatable in the front-rear direction with respect to the body case 2.

As shown in FIG. 7, the main body case 2 is composed of a lower case 10 and an upper case 11, and the upper case 11 can be rotated with respect to the lower case 10 on the upper rear surface of the lower case 10. A hinge portion 20 is provided to support the.

Further, the projection type liquid crystal display device according to this embodiment has a second mirror 21. The second mirror 21 reflects the image light emitted from the projection unit 3 toward an external screen such as a wall. As shown in FIG. 7, the second mirror 21 is provided on the back surface side of the first mirror 9. It is composed of a main body 22 and a hinge portion 23 that rotatably supports the lower portion of the mirror main body 21 with respect to the first mirror 9.

In the third embodiment of the present invention configured as described above, when the upper case 11 is rotated clockwise in the drawing with the hinge portion 20 provided on the upper rear surface of the lower case 10 as a fulcrum, the lower case is rotated. The upper rear surface of 10 is opened, and the second mirror 21 provided on the ceiling of the main body case 2 is exposed.
Next, in this state, the first mirror 9 is rotated to the front side of the main body case 2 about the hinge portion 19 as a fulcrum, and then the hinge portion 2 is rotated.
When the second mirror 21 is rotated clockwise in the drawing with the fulcrum 3 as a fulcrum, the second mirror 21 is arranged above the projection unit 3 as shown in FIG. Therefore, by directing the reflecting surface of the second mirror 21 to an external screen such as a wall, the image displayed on the liquid crystal display element 4 of the projection unit 3 can be projected and displayed on the external screen such as a wall.

FIGS. 10 to 12 are views showing a fourth embodiment of the projection type liquid crystal display device according to the present invention. As shown in FIG. 10, the projection type liquid crystal display device has a light transmission type screen 1 as shown in FIG.
Is equipped with. The light-transmissive screen 1 forms the display screen of the present device, and is provided on the upper front surface of the main body case 2.

Further, the projection type liquid crystal display device according to this embodiment is provided with a projection unit 3 as shown in FIG. This projection unit 3 is for projecting and displaying an image on the back surface of the light transmission type screen 1, and as shown in FIG. 11, a liquid crystal display element 4 and a projection lens for enlarging the image displayed on this liquid crystal display element 4. 5 and a backlight light source 6 for illuminating the liquid crystal display element 4 from the back side.

Polarizing plates 7 and 8 are provided on the light incident side and the light emitting side of the liquid crystal display element 4 so as to face the liquid crystal display element 4. Further, the projection type liquid crystal display device according to this embodiment includes a mirror 9. The mirror 9 reflects the image light emitted from the projection unit 3 toward the light transmissive screen 1, and as shown in FIG. 10, a mirror main body 18 provided on the ceiling of the main body case 2, A hinge portion 19 that supports the upper portion of the mirror body 18 so as to be rotatable in the front-rear direction with respect to the body case 2.

The body case 2 is, as shown in FIG.
It consists of a lower case 10 and an upper case 11, and the lower case 10
A hinge portion 20 that rotatably supports the upper case 11 with respect to the lower case 10 is provided on the upper rear surface of the.

In the fourth embodiment of the present invention configured as described above, when the upper case 11 is rotated clockwise in the drawing with the hinge portion 20 provided on the upper rear surface of the lower case 10 as a fulcrum, the lower case is rotated. The upper rear part of 10 is opened. Next, when the first mirror 9 is rotated to the front side of the main body case 2 with the hinge portion 19 as a fulcrum in this state, the projection unit 3 is exposed from the main body case 2 as shown in FIG. Therefore, by directing the projection lens 5 of the projection unit 3 to an external screen such as a wall in this state, the image displayed on the liquid crystal display element 4 of the projection unit 3 can be projected and displayed on the external screen such as a wall.

13 to 15 are views showing a fifth embodiment of the projection type liquid crystal display device according to the present invention. This projection type liquid crystal display device, as shown in FIG. The liquid crystal display element 4 provided in the case 2 is provided.

The liquid crystal display element 4 is for displaying an image projected and displayed on a display screen (light transmissive screen 1) provided on the upper front surface of the body case 2. The liquid crystal display element 4 has a light incident side. Is provided with a light incident side polarization plate 7,
Further, a backlight light source 6 is provided on the rear side. The backlight light source 5 illuminates the liquid crystal display element 4 from the back side. For example, a light source lamp such as a metal halide lamp or a xenon lamp, and a parabola that reflects the light source light emitted from the light source lamp forward. It is composed of a surface reflector.

On the other hand, a light emitting side polarization plate 8 is provided on the light emitting side of the liquid crystal display element 4, and a first projection lens unit 24 for enlarging an image displayed on the liquid crystal display element 4 is provided on the front side thereof. Is provided. The first projection lens unit 24 includes a unit main body 25 and a projection lens 5 incorporated in the unit main body 25, and the unit main body 25 is a recess 2 provided on the rear surface of the main body case 2.
6 is detachably fitted.

Further, the projection type liquid crystal display device according to this embodiment is provided with a mirror 9 as shown in FIG. The mirror 9 reflects the image light from the projection lens unit 24 toward the light transmissive screen 1, and is provided on the ceiling of the main body case 2.

Further, as shown in FIG. 14, the projection type liquid crystal display device according to the present embodiment has a second projection lens unit 2
Equipped with 7. This second projection lens unit 27
Includes a unit body 28, a mirror 29 and a projection lens 30 incorporated in the unit body 28, and the unit body 28 is provided on the rear surface of the body case 2 like the unit body 25 of the projection lens unit 24. The recess 26 is detachably fitted.

In the fifth embodiment of the present invention configured as described above, the first projection lens unit 24 is attached to the main body case 2.
Of the second projection lens unit 2
When 7 is fitted in the recess 26 of the main body case 2, as shown in FIG. 15, the image light emitted from the liquid crystal display element 4 enters the projection lens 30 through the mirror 29, and the projection lens 3
Since the image is projected from 0 to an external screen such as a wall, the image displayed on the liquid crystal display element 4 can be projected and displayed on the external screen such as a wall.

[0037]

As described above, according to the present invention, the image displayed on the liquid crystal display device can be projected and displayed on an external screen such as a wall other than the screen forming the display screen of the main body case. Type liquid crystal display device can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a projection display device according to a first embodiment of the invention.

FIG. 2 is a diagram showing a schematic configuration of a projection unit of the embodiment.

FIG. 3 is an operation explanatory view of the same embodiment.

FIG. 4 is a diagram showing a schematic configuration of a projection type display device according to a second embodiment of the invention.

FIG. 5 is a diagram showing a schematic configuration of a projection unit of the embodiment.

FIG. 6 is an explanatory view of the operation of the same embodiment.

FIG. 7 is a diagram showing a schematic configuration of a projection display device according to a third embodiment of the invention.

FIG. 8 is a diagram showing a schematic configuration of a projection unit of the embodiment.

FIG. 9 is an operation explanatory view of the same embodiment.

FIG. 10 is a diagram showing a schematic configuration of a projection display device according to a fourth embodiment of the invention.

FIG. 11 is a diagram showing a schematic configuration of a projection unit of the embodiment.

FIG. 12 is an operation explanatory view of the same embodiment.

FIG. 13 is a diagram showing a schematic configuration of a projection display device according to a fifth embodiment of the invention.

FIG. 14 is a diagram showing a schematic configuration of a second projection unit of the embodiment.

FIG. 15 is an explanatory view of the operation of the embodiment.

[Explanation of symbols]

 1 ... Light-transmissive screen 2 ... Main body case 3 ... Projection unit 4 ... Liquid crystal display element 5 ... Projection lens 6 ... Backlight light source 9 ... Mirror 10 ... Lower case 11 ... Upper case 12 ... Hinge metal fitting 16 ... Back cover 19 ... Hinge Part 21 ... Second mirror 24 ... First projection lens unit 26 ... Recessed part 27 ... Second projection lens unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Nakagusu 2-229 Sakuragaoka, Higashiyamato-shi, Tokyo Casio Computer Co., Ltd. Tokyo office

Claims (3)

[Claims] 1. A projection type liquid crystal display device for enlarging an image displayed on a liquid crystal display element by a projection lens and projecting the image on a display screen provided on the front surface of the main body case, wherein the main body case is a lower case and an upper case. And a projection type liquid crystal display device, wherein the upper case is provided so as to be rotatable with respect to the lower case. 2. A projection type liquid crystal display device for enlarging an image displayed on a liquid crystal display element with a projection lens and projecting the image on a display screen provided on the front surface of the main body case, wherein the main body is provided on the back side of the main body case. A projection-type liquid crystal display device, wherein a rear cover that closes an opening of the case is provided so as to be openable and closable, and the liquid crystal display element and the projection lens are unitized and are provided so as to be rotatable behind the main body case. 3. A projection type liquid crystal display device for enlarging an image displayed on a liquid crystal display element with a projection lens and projecting and displaying the image on a display screen provided on the front surface of the main body case, wherein the projection lens is provided on the main body case. Projection type liquid crystal display, wherein a second projection lens unit for projecting an image displayed on the liquid crystal display element onto an external screen is detachably provided to the main body case. apparatus.