JPH0659237A - Projection type liquid crystal display device - Google Patents

Abstract

PURPOSE:To obtain the projection type liquid crystal display device which meets audience conditions of video for one person or many people according to one person or many people. CONSTITUTION:The projection type liquid crystal display device 1 is equipped with a portable housing 2. The housing 2 contains a light source 5, a liquid crystal panel 6, a projection lens 7, a transmission screen 11, and a lens 13 for field angle switching. A base 8 wherein the projection lens 7, liquid crystal panel 6, and light source 5 are incorporated is angularly rotated on a perpendicular axis 9 from a 0 deg. angle position to a 90 deg. angle position at the upper body. When the base 8 is rotated and moved to the 90 deg. angle position, the optical axis of the lens 13 for field angle switching is aligned with the optical axis of the projection lens 7. The lens 13 for field angle switching cooperates with the projection lens 7 to prescribe a field angle theta2 smaller than a field angle theta1 and the field angle theta2 is determined by the diagonal length of an 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, and more particularly to a projection type liquid crystal display device for personal use.

[0002]

2. Description of the Related Art Generally, liquid crystal display devices include liquid crystal display devices for business use and liquid crystal display devices for personal use.

As one of the liquid crystal display devices for personal use, there is a direct-viewing type liquid crystal television which has a liquid crystal screen in which a liquid crystal element is provided for each pixel and which displays an image on the liquid crystal screen.

On the other hand, as another liquid crystal display device for personal use, which has been actively commercialized along with this direct-view type liquid crystal television, a liquid crystal panel for forming an image by driving liquid crystal elements corresponding to respective pixels is used. There is a projection type liquid crystal display device that projects light emitted from a projection lens and projects an image on this screen.

However, it is difficult to increase the size of a liquid crystal screen used in a direct-viewing type liquid crystal television at the present time in terms of accuracy. For example, manufacturing a liquid crystal screen having a width of 30 cm or more requires a great deal of cost, and a width of 30 cm. As described above, a direct-viewing type liquid crystal television having a liquid crystal screen is not commercially viable. Therefore, the liquid crystal screen of the direct-viewing type liquid crystal television for personal use is made small in terms of cost, and the direct-viewing type liquid crystal television is not suitable for viewing by a large number of people.

On the other hand, in the projection type liquid crystal display device, since the image is projected on the external screen, the image can be viewed with many people, but preparation work such as hanging the external screen on the wall is required. This preparatory work is time-consuming when watching the video alone.

[0007]

As described above, in the conventional liquid crystal display device for personal use, the condition of the number of viewers such as when the number of viewers is large or when the viewer is one is simple. Can not be satisfied properly with such operations.

In order to solve the above-mentioned problems, the present invention makes it possible to easily adjust the number of viewers when the viewing condition of a video is one or when the viewing condition of a video is large. It is an object of the present invention to provide a projection type liquid crystal display device that can satisfy the above requirements.

[0009]

The present invention is a projection type liquid crystal display device in which a liquid crystal panel for forming an image by driving liquid crystal elements corresponding to respective pixels is housed in a housing. A transparent screen having a display surface for displaying an image of the liquid crystal panel formed on the front surface, a first angle of view corresponding to the transparent screen, and a size smaller than the first angle of view and the housing. Either one of the second angles of view corresponding to the external screen located outside is specified by a switching operation, and when the switching operation of defining the first angle of view is performed, the image on the liquid crystal panel is displayed. A corresponding light image is projected on the back surface of the transmissive screen, and a light image corresponding to the image on the liquid crystal panel is projected on the external screen when a switching operation that defines the second angle of view is performed. And a projection means for.

[0010]

[Operation] In the present invention, one of a first angle of view corresponding to the transmissive screen and a second angle of view corresponding to an external screen that is smaller than the first angle of view and is arranged outside the first angle of view. Projection means is provided for defining the angle of view by a switching operation.

When a switching operation for defining the first angle of view is performed on the projection means, an optical image corresponding to the image on the liquid crystal panel is projected on the rear surface of the transmissive screen and is projected on the front surface of the transmissive screen. Is projected on the screen. On the other hand, when the switching operation that defines the second angle of view is performed, a light image corresponding to the image on the liquid crystal panel is projected on the external screen, and the image is displayed on the external screen. Therefore, an image can be displayed on one of the transparent screen and the external screen by a switching operation for defining one of the first angle of view and the second angle of view. The condition of the number of viewers such as when the viewing condition of the video is one person or when the viewing condition of the video is a large number of people can be appropriately satisfied by a simple operation.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing the arrangement of the main parts in one embodiment of the projection type liquid crystal display device of the present invention, and FIG. 2 shows the housing state of the main parts of the projection type liquid crystal display device of FIG. FIG. 3 is a side view, FIG. 3 is a side view showing a state where the upper body of the projection type liquid crystal display device of FIG. 1 is opened, FIG. 4 is a perspective view showing an appearance of the projection type liquid crystal display device of FIG. Figure 1
FIG. 6 is a diagram for explaining a view angle switching state of the projection type liquid crystal display device of FIG.

As shown in FIG. 4, the projection type liquid crystal display device 1 has a portable housing 2. Case 2 is the top of the desk,
It has a lower body 3 which is placed on a supporting surface such as a floor. The lower body 3 is a box body that opens upward and forms a housing space. An upper body 4 is rotatably attached to the lower body 3 about a horizontal axis (not shown).

The upper body 4 is a box body which opens downward and forms an accommodation space. The upper body 4 is superposed so that the lower opening and the upper opening of the lower body 3 are aligned with each other, and the lower body 3 is rotated by a rotary motion about the horizontal axis of the upper body 4.
The upper opening of is opened and closed. The upper body 4 and the lower body 3 cooperate with each other to form a housing space for components.

In the housing 2, as shown in FIG.
And a plurality of liquid crystal elements (not shown) for forming pixels
A liquid crystal panel having 6 and 6 are housed.

The light source 5 is arranged on the back side of the liquid crystal panel 6, and the light from the light source 5 is transmitted from the back side to the front side of the liquid crystal panel 6.

The transmitted light from the liquid crystal panel 6 is the liquid crystal panel 6.
Is incident on the projection lens 7 arranged on the front surface of the. The angle of view of the projection lens 7 is set to θ1. The projection lens 7, the liquid crystal panel 6 and the light source 5 are incorporated in a common base 8 while making their optical axes coincide with each other. The base 8 is attached to the upper body 4 so as to be rotatable around a vertical axis 9,
The rotation angle range around the vertical axis 9 is a range from an angular position of 0 degree (shown in FIG. 1) to an angular position of 90 degrees (shown in FIG. 1). Rotational motion of the base 8 about the vertical axis 9 is caused by the housing 2
It is done by manual operation from the outside.

A transparent screen 11 is built in the housing 2. The lower end of the transmissive screen 11 is rotatably attached to the lower body 3 of the housing 2 around a horizontal axis 12, and the rotational movement of the transmissive screen 11 is interlocked with the opening / closing operation of the upper body 4 by an interlocking mechanism (not shown). To do.

When the upper body 4 is opened to a predetermined angular position, the transmissive screen 11 rises diagonally in the vertical direction and is held at that position, as shown in FIG. When the transmissive screen 11 rises, the transmissive screen 11 is orthogonal to the optical axis of the projection lens 7 at an angle position of 0 degree and the linear distance from the projection lens 7 is l ₁ (shown in FIG. 5). Positioned. On the other hand, when the upper body 4 is closed with respect to the lower body 3, as shown in FIG. 2, the transmissive screen 11 interlocks with the closing operation of the upper body 4 to a position where it is substantially horizontal around the horizontal axis 12. It is rotated and stored in the housing 2.

The diagonal length of the transmissive screen 11 is determined by the angle of view of the projection lens 7.

As shown in FIG. 1, the housing 2 accommodates an angle-of-view switching lens 13. View angle switching lens 13
Are attached to the lower body 3. The angle-of-view switching lens 13 is arranged on the lower body 3 so that the optical axis of the angle-of-view switching lens 13 and the optical axis of the projection lens 7 coincide with each other when the base 8 is rotationally moved to an angular position of 90 degrees. Has been done. As shown in FIG. 4, the view angle switching lens 13 is exposed to the outside through an opening provided on the side surface of the lower body 3. The angle-of-view switching lens 13 is, as shown in FIG.
The angle of view θ ₂ is defined in cooperation with the angle of view θ ₁ and the angle of view θ ₂ is determined from the diagonal length of the external screen 16. In this embodiment, an optical lens system such as a convex lens for narrowing the field angle defined by the projection lens 7 is used as the field angle switching lens 13.

Next, a method of using the video display device will be described with reference to the drawings. FIG. 6 is a diagram for explaining an example of a usage state of the projection type liquid crystal display device of FIG. 1, and FIG. 7 is a diagram for explaining another example of a usage state of the projection type liquid crystal display device of FIG.

When one person watches an image, the projection type liquid crystal display device 1 is first placed on the desk 14 as shown in FIG.
The upper body 4 is opened to a predetermined angular position. As the upper body 4 is opened, the base 8 is held obliquely upward at an angle position of 0 degrees as shown in FIG. At the same time, the transmissive screen 11 stands up while being rotated around the horizontal axis 12 and is held at a predetermined angular position.

Then, the main power source is turned on to drive the light source 5 and the liquid crystal panel 6. The light from the light source 5 enters the projection lens 7 through the liquid crystal panel 6, and the light emitted from the projection lens 7 is projected on the back surface of the transmissive screen 11. This projection light is transmitted from the back side to the front side of the transmissive screen 11,
An image is displayed on the front surface of the transmissive screen 11.

When the viewing of the image is completed, the main power source is shut off and the upper body 4 is closed. With the closing operation of the upper body 4, the base 8 is held in a substantially horizontal position, and at the same time, the transmissive screen 11 is rotated around the horizontal axis 12 and accommodated in the housing 2.

When a large number of people watch the image, as shown in FIG. 7, in the projection type liquid crystal display device 1, the optical axis of the angle-of-view switching lens 13 is obliquely upward with the upper body 4 closed. It is placed on the desk 15 so as to face. The base 8 is rotated by a manual operation from the outside of the housing 2, and is held at a 90-degree angular position where the optical axes of the projection lens 7 and the angle-of-view switching lens 13 coincide with each other.

Next, adjustment is made to set the distance between the projection lens 7 and the external screen 16 hung on the wall to l ₂ . After the adjustment, the main power source is turned on, the light from the light source 5 enters the projection lens 7 through the liquid crystal panel 6, and the light emitted from the projection lens 7 passes through the view angle switching lens 13 and the view angle θ2.
Is projected on the front surface of the external screen 16.

An image is displayed on the front surface of the external screen 16 and is viewed by many people.

As described above, when the video viewing condition is one person or when the video viewing condition is a large number of people, these viewing conditions are satisfied by a simple operation such as a switching operation for the angle-of-view switching lens. be able to.

Next, another projection type liquid crystal display device will be described with reference to the drawings. FIG. 8 is a block diagram showing the main part of another embodiment of the projection type liquid crystal display device of the present invention, and FIG. 9 explains the operation of the angle-of-view switching lens used in the projection type liquid crystal display device of FIG. FIG.

As shown in FIG. 8, the projection type liquid crystal display device 21 is provided with a portable housing 2 in which an upper body (not shown) and a lower body 3 work together.

The housing 2 houses a light source 5, a liquid crystal panel 6 and a base 8 on which a projection lens 22 whose angle of view θ2 is determined by the diagonal length of the external screen 16 is mounted. The base 8 is rotatably attached to the upper body about a vertical axis 9, and the rotation angle range around the vertical axis 9 is a range from an angular position of 0 degree to an angular position of 90 degrees. The rotational movement of the base 8 around the vertical axis 9 is performed by a manual operation from the outside of the housing 2.

When the base 8 is at an angular position of 0 degrees, the angle-of-view switching lens 23 attached to the upper body is located in front of the projection lens 22, and the angle-of-view switching lens 23 is used for the light. It is arranged so that its axis coincides with the optical axis of the projection lens 22. The view angle switching lens 23 cooperates with the projection lens 22 to define a view angle θ1 larger than the view angle θ2.
1 is determined from the diagonal length of the transmissive screen 11. In this embodiment, an optical lens system such as a concave lens for widening the field angle defined by the projection lens 22 is used as the field angle switching lens 23.

The transmission screen 11 stands up in front of the angle-of-view switching lens 23. The lower end of the transmissive screen 11 is rotatably attached to the lower body 3 of the housing 2 around a horizontal axis 12, and the rotational movement of the transmissive screen 11 is linked to the opening / closing operation of the upper body. When the upper body 4 is opened to a predetermined angle position, the transmissive screen 11 stands up obliquely in the vertical direction and is held at that position. When the transmissive screen 11 rises, the transmissive screen 11 is positioned so as to be orthogonal to the optical axis of the angle-of-view switching lens 23 located at an angular position of 0 degree. On the other hand, when the upper body 4 is closed with respect to the lower body 3, the transmissive screen 11 is rotated about the horizontal axis 12 to a substantially horizontal position in association with the closing operation of the upper body 4, and Housed in.

When the base 8 is at a position of 90 degrees, the projection lens 22 is exposed to the outside through an opening (not shown) provided on the side surface of the lower body 3.

Image display on the transmissive screen 11 is performed by an operation of opening the upper body and an operation of positioning the base 8 at an angular position of 0 degrees, and image display on the external screen 16 is performed by moving the base 8 at 90 degrees. It is performed by the operation of positioning at the angular position of.

Next, another projection type liquid crystal display device will be described with reference to the drawings. FIG. 10 is a constitutional view showing the main part of still another embodiment of the projection type liquid crystal display device of the present invention.

As shown in FIG. 10, the projection type liquid crystal display device 31 includes a portable housing 2 composed of a lower body 3 and an upper body 4.

The housing 2 includes a light source 5, a liquid crystal panel 6
The projection lens 22 having an angle of view corresponding to the external screen and the transmissive screen 11 are housed.

Projection lens 7, liquid crystal panel 6 and light source 5
Are mounted on a common base (not shown) with their optical axes aligned. A base (not shown) is attached to the upper body 3.

The lower end of the transmissive screen 11 is attached to the lower body 3 of the housing 2 so as to be rotatable around a horizontal axis (not shown). When the upper body 4 is opened to a predetermined angular position, the transparent screen 11 is manually operated from the outside.
Stands up diagonally in the vertical direction and is held in that position.
On the other hand, when the upper body 4 is closed, the transmissive screen 11 is rotated by a manual operation from the outside to a position where the transmissive screen 11 becomes substantially horizontal about the horizontal axis and is housed in the housing 2.

An angle-of-view switching lens 32 is housed in the housing 2. The angle-of-view switching lens 32 is rotatably supported around a horizontal axis 33 of the lower body 3. One end of a connecting wire 34 for connecting the rotational movement of the angle-of-view switching lens 32 to the rotational movement of the transmissive screen 11 is connected. The other end of the connecting wire 34 is the transparent screen 1
It is connected to the lower end of 1.

When the transmissive screen 11 is slanted in the vertical direction, the view angle switching lens 32 is rotated to a position where its optical axis coincides with the optical axis of the projection lens 22, and is held at that position. The view angle switching lens 32 cooperates with the projection lens 22 to define a view angle larger than the view angle of the projection lens 22, and the defined view angle is determined from the diagonal length of the transmissive screen 11. In this embodiment, an optical lens system such as a concave lens for widening the field angle defined by the projection lens 22 is used as the field angle switching lens 32.

On the other hand, when the transmissive screen 11 is housed in the housing 2 by a manual operation from the outside, the angle-of-view switching lens 32 is rotated around the horizontal axis 33 so that it is positioned below the transmissive screen 11. Retained.

The image display on the transmissive screen 11 is performed by the opening operation of the upper body and the rising operation of the transmissive screen 11, and the image display on the external screen is performed by the opening operation of the upper body.

Next, still another projection type liquid crystal display device will be described with reference to the drawings. FIG. 11 is a constitutional view showing a main part of still another embodiment of the projection type liquid crystal display device of the present invention.

As shown in FIG. 11, the projection type liquid crystal display device 41 includes a portable housing 2 having a lower body 3 and an upper body 4 provided with an openable / closable lid member 42. A guide groove 43 is formed in the lid member 42 of the upper body 4.

The housing 2 includes a light source 5, a liquid crystal panel 6 and
The projection lens 7 and the transmissive screen 11 whose diagonal length is determined by the angle of view of the projection lens 7 are housed.

Projection lens 7, liquid crystal panel 6 and light source 5
Are mounted on a common base (not shown) with their optical axes aligned. A base (not shown) is rotatably attached to the upper body 3 about a horizontal axis (not shown),
The rotational movement of the base is interlocked with the opening / closing operation of the lid member 42. When the lid member 42 is opened to a predetermined angular position, the base is oriented diagonally upward and is held at that position. On the other hand, when the lid member 42 is closed, the base is held in a substantially horizontal position.

The lower end of the transmissive screen 11 is attached to the lower body 3 of the housing 2 so as to be rotatable around a horizontal axis (not shown). When the upper body 4 is opened to a predetermined angular position, the transmissive screen 11 rises diagonally upward in the vertical direction and is held at that position. On the other hand, when the upper body 4 is closed, the transmissive screen 11 is rotated about the horizontal axis to a substantially horizontal position and is housed in the housing 2.

An angle-of-view switching lens 44 is housed in the housing 2. The angle-of-view switching lens 44 is rotatably supported around a horizontal axis 45 of the upper body 4. The angle-of-view switching lens 44 has a shaft 46 with a guide groove 43 when the lid member 42 is opened and closed.
It is rotated by being guided to. When the lid member 42 is opened to a predetermined angular position, the view angle switching lens 44
Stands up diagonally upward in the vertical direction, and the projection lens 7
Is held at a position positioned with respect to the optical axis of. On the other hand, when the lid member 42 is closed, the view angle switching lens 44 is housed in the housing 2. The angle of view switching lens 44 cooperates with the projection lens 7 to define an angle of view smaller than the angle of view of the projection lens 7, and the defined angle of view is determined from the diagonal length of the external screen. In this embodiment, an optical lens system such as a convex lens for narrowing the field angle defined by the projection lens 7 is used as the field angle switching lens 44.

Image display on the transmissive screen 11 is performed by opening the upper body 4, and image display on the external screen is performed by opening the lid member 42 of the upper body 4.

[0054]

As described above, according to the projection type liquid crystal display device of the present invention, when the viewing condition of the image is one person, or when the viewing condition of the image is a large number of people, these viewings are performed. The condition can be satisfied by a simple operation.

[Brief description of drawings]

FIG. 1 is a plan view showing an arrangement of main parts in an embodiment of a projection type liquid crystal display device of the present invention.

FIG. 2 is a side view showing an accommodated state of a main part of the projection type liquid crystal display device of FIG. 1 in a housing.

3 is a side view showing a state in which an upper body of the projection type liquid crystal display device of FIG. 1 is opened.

FIG. 4 is a perspective view showing an appearance of the projection type liquid crystal display device of FIG. 1 in a housed state.

5 is a diagram for explaining a view angle switching state of the projection type liquid crystal display device of FIG.

6 is a diagram for explaining an example of a usage state of the projection type liquid crystal display device of FIG.

FIG. 7 is a diagram for explaining another example of a usage state of the projection type liquid crystal display device of FIG.

FIG. 8 is a configuration diagram showing a main part of another embodiment of the projection type liquid crystal display device of the present invention.

9A and 9B are views for explaining the action of a view angle switching lens used in the projection type liquid crystal display device of FIG.

FIG. 10 is a configuration diagram showing a main part of still another embodiment of the projection type liquid crystal display device of the present invention.

FIG. 11 is a configuration diagram showing a main part of still another embodiment of the projection type liquid crystal display device of the present invention.

[Explanation of symbols]

 1, 21, 31, 41 Projection type liquid crystal display device 2 Housing 3 Lower body 4 Upper body 5 Light source 6 Liquid crystal panel 7,22 Projection lens 8 Base 9 Vertical axis 11 Transparent screen 12 Horizontal axis 13, 23, 32, 44 Lens for switching angle of view 16 External screen 34 Connecting wire 42 Lid member

Claims (1)

[Claims] 1. A projection type liquid crystal display device in which a liquid crystal panel for forming an image by driving a liquid crystal element corresponding to each of pixels is housed in a housing, the liquid crystal panel being attached to the housing and having the liquid crystal on the front surface. Corresponding to a transmissive screen on which a display surface for displaying an image of a panel is formed, a first angle of view corresponding to the transmissive screen, and an external screen smaller than the first angle of view and arranged outside One of the second angles of view is defined by a switching operation, and when the switching operation of defining the first angle of view is performed, an optical image corresponding to the image on the liquid crystal panel is displayed on the transmissive screen. Projection means for projecting on a rear surface and projecting an optical image corresponding to the image of the liquid crystal panel onto the external screen when a switching operation for defining the second angle of view is performed. Projection type liquid crystal display device according to claim.