JP2916007B2 - Projection type video display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type image display device for displaying an enlarged image on a screen or the like, and more particularly, to a projection type image display device having a cooling mechanism having excellent cooling efficiency.

[0002]

2. Description of the Related Art FIG.
This will be described with reference to FIGS. As this type of projection type image display apparatus, there is an apparatus using three liquid crystal panels 31R, 31G, and 31B of red, green, and blue (hereinafter, referred to as R, G, and B). Such a projection-type image display device includes a light source 10 that emits light source light L, and a light source light L that emits R, G, and B components LR and L.
A reflection system 20 for decomposing into G and LB, and each component L of R, G and B
Each component LR, L transmitted through three liquid crystal panels 31R, 31G, 31B into which only one component out of R, LG, LB is incident.
An enlargement projection lens system 40 for superimposing G and LB on an unillustrated screen in an enlarged manner, a cooling mechanism 50 for cooling the liquid crystal panels 31R, 31G and 31B, and a cabinet for accommodating them.
60 and has.

As shown in FIG. 7, a reflection system 20 has a component L
First dichroic mirror that transmits only R and LG
211, a second dichroic mirror 212 transmitting only the component LG, a third dichroic mirror 213 transmitting only the component LB, and a fourth dichroic mirror 214 transmitting only the components LR and LB. First to third total reflection mirrors 201 for reflecting all components
To 203. Note that 230 shown in FIG.
It is an IR filter.

[0004] The component LG that has passed through the first dichroic mirror 211 and the second dichroic mirror 212 enters a liquid crystal panel 31G on which an image corresponding to the component LG is displayed. The liquid crystal panel 31R on which an image corresponding to the component LR is displayed has a first dichroic mirror 21.
The component LR that has passed through 1 and is selectively reflected by the second dichroic mirror 212 enters. Further, the liquid crystal panel 31B on which an image corresponding to the component LB is displayed has a component LB selectively reflected by the first dichroic mirror 211 and reflected by the second total reflection mirror 202.
Is incident.

The component LB transmitted through the liquid crystal panel 31B and the component LR transmitted through the liquid crystal panel 31R are incident on a third dichroic mirror 213. The component LG transmitted through the liquid crystal panel 31G is incident on the fourth dichroic mirror 214 via the third total reflection mirror 203. This fourth
The components LR and LB incident on the third dichroic mirror 213 are also incident on the dichroic mirror 214, so that the components LR, LG and LB are superimposed on the fourth dichroic mirror 214 and The image is projected on a screen via the lens system 40.

[0006] As described above, the light source light L is converted into the components LR,
In order to decompose into LG and LB and to superimpose it again, FIG.
As shown in the figure, the liquid crystal panel 31
R is the liquid crystal panel 31B in the upper left, and the liquid crystal panel in the lower left.
31G are installed respectively.

Since a metal halide lamp is used as the light source 10, the inside of the cabinet 60 becomes hot. In particular, each component LR incident on each liquid crystal panel 31R, 31G, 31B,
Heat generated by LG and LB is generated by liquid crystal panels 31R, 31G and 31B.
Of the liquid crystal panels 31R, 31G, 31B
Requires cooling. The cooling mechanism 50 for this purpose includes an axial fan 51 provided substantially in the center of the side surface of the cabinet 60.
And a motor (not shown) for driving the axial fan 51 to rotate. Openings 61 to 63 corresponding to the liquid crystal panels 31R, 31G, and 31B are provided on the side surface of the cabinet 60 (however, the opening 62 corresponding to the liquid crystal panel 31R is not shown in FIG. 5). The cooling air W is guided into the cabinet 60 via 61 to 63.

[0008]

However, in the axial flow fan 51 used in the cooling mechanism 50, the air volume near the central shaft portion 511, which is the center of rotation, is small compared to the surroundings. Therefore,
The liquid crystal panel 31R closest to the central shaft portion 511 of the axial fan 51
Has a lower cooling efficiency than those of the other liquid crystal panels 31B and 31G. Further, the wind from the axial fan 51 is unstable and difficult to handle. Furthermore, even if the rotation speed of the motor is increased to increase the air volume, the air volume does not increase so much and the noise only increases.

The present invention has been made in view of the above circumstances, and has as its object to provide a projection-type image display apparatus having a cooling mechanism capable of efficiently cooling three liquid crystal panels.

[0010]

According to the present invention, there is provided a projection type video display apparatus comprising: a liquid crystal panel on which an image to be projected on a screen is displayed; a light source for projecting light from the light source onto the liquid crystal panel; a cooling mechanism for cooling the liquid crystal Pas
With built-in panel, light source and cooling mechanism,
Cabinet with an opening facing the LCD panel
And the cooling mechanism is provided in the cabinet.
Opposed to the LCD panel through the opening, and the center of rotation
The cabinet so that it is parallel to the side of the cabinet.
A cross flow fan attached to the side of the net,
Cooling from the cross-flow fan attached to the opening
And a wind guide plate for guiding wind to the liquid crystal panel.

[0011]

FIG. 1 is a side view showing a schematic configuration of a projection type video display apparatus according to an embodiment of the present invention. FIG. 2 is a projection view showing a state in which a cooling mechanism is removed from a cabinet to show an opening of the cabinet. FIG. 3 is a side view showing a schematic configuration of the projection type image display device, FIG. 3 is a front view of the projection type image display device, and FIG. 4 is a sectional view taken along line AA of FIG. It is to be noted that parts and the like that are substantially the same as those of the related art are denoted by the same reference numerals and described.

The projection type video display apparatus according to the present embodiment has three liquid crystal panels 31R, 31G, 31B on which an image to be projected on a screen (not shown) is displayed, and the liquid crystal panel 3
Light source 10 for projecting light source light L on 1R, 31G, 31B
A cooling mechanism 70 for cooling the liquid crystal panels 31R, 31G, 31B; and a liquid crystal panel 31R, 31G, 31B,
The light source 10 and the cooling mechanism 70 are built in, and
Three facing the liquid crystal panels 31R, 31G, 31B
With a cabinet 60 having openings 61 to 63
The cooling mechanism 70 includes the cabinet 60
The liquid crystal panels 31R, 31G,
31B and the center of rotation is the cabinet 6
0 of the cabinet 60 so as to be parallel to the side of
A cross-flow fan 71 mounted on the side,
Cross flow fan 7 attached to openings 61 to 63
The cooling air W from 1 is supplied to the liquid crystal panels 31R, 31G, 31B.
And a baffle plate 72 for guiding the air.

The projection type image display apparatus according to the present embodiment is the same as the one described in the section of the prior art except that the cooling mechanism 70 is different, and the other components are the same.
The explanation focuses on 70.

The three liquid crystal panels 31R, 31G, and 31B are adapted to display images to be projected, which are decomposed corresponding to the three colors R, G, and B. Each liquid crystal panel 31R, 31
Polarizers 32R, 32G, and 32B are provided on the incident sides of G and 31B.

On the side surface of the cabinet 60, three rectangular openings 61 to 63 corresponding to the three liquid crystal panels 31R, 31G and 31B are opened. This opening
The ports 61 to 63 are connected to the liquid crystal panel 31 as shown in FIG.
R, 31G, 31B
I have. Therefore, the liquid crystal panel 31 is opened from each of the openings 61 to 63.
R, 31G and 31B can be seen. Of these, the air guide plates 72a, 7a are provided at both ends of the long side of the opening 61 corresponding to the liquid crystal panel 31B into which the component B of the light source light L is incident.
2b is attached to the opening 61 so as to be substantially funnel-shaped. On one side of the long side of the opening 63 corresponding to the liquid crystal panel 31G where the component G of the light source light L is incident, a baffle plate 72c is attached in a state inclined with respect to the edge of the opening 63.

The cross flow fan 71 constituting the cooling mechanism 70 faces the openings 61 to 63 , that is, opens.
The liquid crystal panels 31R, 31G, 31 through the ports 61 to 63
It is attached obliquely to the side surface of the cabinet 60 by an angle (not shown) or the like so as to face B. Since the center of rotation of the cross flow fan 71 is set parallel to the side surface of the cabinet 60, the same amount of cooling air W can be sent to any of the openings 61 to 63.
The cooling air W from the cross flow fan 71 is
Liquid crystal panels 31R, 31G, 31B via 61 to 63
Will be sent directly to Further, as shown in FIG.
Then, the cabinet 60 is moved by the cross flow fan 71.
The cooling air W sent into the inside of the
Opening on the side opposite to the
Omitted). Therefore, the cooling air W
Because they do not stay inside the cabinet 60,
Cooling efficiency can be achieved.

However, air guide plates 72a and 72b are provided in the opening 61,
Since the air guide plates 72c are attached to the openings 63, the amount of air blown to each of the openings 61 to 63 is as follows.
An opening 62 is formed. This is because each liquid crystal panel 31R, 31G, 31B
In consideration of the calorific value in the above. That is, the calorific value of the liquid crystal panel 31B on which the component B having the shortest wavelength is incident is the largest, and the liquid crystal panel 31G
This is because it becomes 31R.

[0018]

According to the present invention, there is provided a projection type video display device, comprising: a liquid crystal panel on which an image to be projected on a screen is displayed;
A light source for projecting light source light onto the liquid crystal panel, a cooling mechanism for cooling the liquid crystal panel, the liquid crystal panel, the light source and
With a built-in cooling mechanism, the liquid crystal panel on the side
Cabinet with opposed openings
And the cooling mechanism is provided through an opening of the cabinet.
While facing the liquid crystal panel, the center of rotation is
Side of the cabinet so that it is parallel to the side of the cabinet
A cross flow fan attached to the
Cooling air from the cross flow fan
Than and a wind guide plate for guiding the panel, it is possible to cool the liquid crystal panel efficiently. In particular, since more cooling air can be sent by the air guide plate to the liquid crystal panel that generates a large amount of heat, that is, the liquid crystal panel to which a component having a short wavelength is incident, the efficiency is excellent. Further, since the cross flow fan is used, stable cooling air can be obtained, and noise can be reduced as compared with the conventional one.
Furthermore, since the cooling air is sent directly to the liquid crystal panel through the opening, the cooling efficiency is higher.

[Brief description of the drawings]

FIG. 1 is a side view showing a schematic configuration diagram of a projection display apparatus according to an embodiment of the present invention.

FIG. 2 is a side view showing a schematic configuration of the projection display apparatus in a state where a cooling mechanism is removed from the cabinet to show an opening of the cabinet.

FIG. 3 is a front view of the projection display apparatus.

FIG. 4 is a sectional view taken along line AA of FIG. 1;

FIG. 5 is a side view showing a schematic configuration diagram of a conventional projection type video display device.

FIG. 6 is a front view of a conventional projection image display device.

FIG. 7 is an explanatory diagram showing a reflection system and a liquid crystal panel of the projection display apparatus.

[Explanation of symbols]

 10 Light source 31R, 31G, 31B LCD panel 70 Cooling mechanism 71 Cross flow fan 72a, 72b, 72c Air guide plate L Light source light W Cooling air

Claims (3)

(57) [Claims] A liquid crystal panel image 1. A to be projected on the screen is displayed, a light source for projecting a light beam to the liquid crystal panel, a cooling mechanism for cooling the liquid crystal panel, the liquid crystal
Built-in panel, light source and cooling mechanism
A cabinet with an opening facing the liquid crystal panel
And the cooling mechanism includes the cabinet.
Facing the LCD panel through the opening of
Key so that the center is parallel to the side of the cabinet
Cross flow fan mounted on the side of cabinet
And attached to the opening, from the cross flow fan
A wind guide plate for guiding cooling air to the liquid crystal panel
A projection type video display device characterized by the above-mentioned . 2. The liquid crystal panel has R, G, and B three-color liquid crystal panels on which light sources decomposed into three components of red, green, and blue by a reflection system are respectively projected. The projection-type image display device according to claim 1, wherein: 3. The projection type image display device according to claim 2 , wherein the air guide plate guides more cooling air to the liquid crystal panel on which a component having a short wavelength is projected.