JP2565027B2 - Projection display device - 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 display device.

[0002]

2. Description of the Related Art As a display device for displaying an image using a display panel such as a liquid crystal display panel, there is a projection type device for enlarging and projecting a display image of the display panel on a screen surface.

In this projection type display device, a condenser lens and a projection lens are arranged on the light emission side of the display panel, and the display image of the display panel is condensed on the projection lens by the condenser lens, and the projection lens is used. This is a system for enlarging and projecting a screen surface installed in front of the device body. According to this projection display device, even if the display screen of the display panel is small, it is possible to greatly enlarge the display image of this display panel. .

[0004]

However, in the conventional projection display device, the display panel, the condenser lens, and the projection lens are arranged in the front-rear direction of the device main body and arranged and fixed in a predetermined positional relationship. , The projection direction of the display image is determined, and therefore, when the screen is diagonally above or below the device body, tilt the entire device body forward or backward according to the screen height. , I had to project the projected image on the screen surface.

The present invention has been made in view of the above situation, and the purpose thereof is to change the projection direction arbitrarily according to the screen height without tilting the entire apparatus main body. The present invention is to provide a projection type display device.

[0006]

According to the projection type display device of the present invention, the projection lens system is moved parallel to the display panel surface.
A lens moving mechanism that allows the projection lens system to
It is characterized in that it can be moved in parallel to the flannel surface .

[0007]

[Action] That is, the projection type display device of the present invention, the projection
A lens that translates the lens system to the display panel surface
A moving mechanism is provided so that the projection lens system faces the display panel surface.
So that they can be translated.
According to this projection type display device, the main body of the device is not tilted.
The projection direction can be changed as desired.
The projected image cannot be distorted like when tilting the body,
Good focus is obtained for the entire projected image.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid crystal projector for enlarging and projecting a display image on a liquid crystal display panel according to an embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 1 denotes a projector main body, and the projector main body 1 has the following structure. That is, 2 is a case of the projector body 1, and a projection window 3 having a transparent plate 4 on the front surface of the case 2.
Is provided.

The inside of the case 2 is partitioned into a light source chamber 2a on the rear side and a display chamber 2b on the front side by a heat insulating wall 5 provided in the center thereof, and a light source 8 is provided in the light source chamber 2a. Has been.

The light source 8 comprises a high-intensity light source lamp 10 such as a xenon lamp or a halogen lamp, and a reflector 11 for reflecting light emitted from the light source lamp 10 toward the front of the projector body 1. The reflector 11 is supported in the light source box 9, and the light source lamp 10 is inserted and fixed in the center of the reflector 11.
The reflector 11 is a parabolic mirror reflector that reflects the emitted light from the light source lamp 10 as parallel light parallel to the reflector optical axis. Have been installed. A translucent window 6 for transmitting the projection light from the light source 8 is opened in the heat insulating wall 5, and a transparent plate 7 made of heat-resistant glass or the like is provided in the translucent window 6.

Further, a transmissive dot matrix liquid crystal display panel 12 for displaying a screen projection image (for example, a television image) is vertically arranged in the display chamber 1b on the front side from the heat insulating wall 5. A light condensing lens 13 formed of a circular Fresnel lens and a projection lens 14 are arranged on the light emission side of the display panel 12, and the liquid crystal display panel 12 is arranged in front of the display panel cooler 15 (with respect to the light source 8). The condenser lens 13 and the projection lens 14 are fixed to the opposite surface), and the condensing lens 13 and the projection lens 14 are the lens moving mechanism 1 described later.
It is supported by 6.

The display panel cooler 15 is a liquid-crystal display panel 12 which is weak against heat because it is filled with a transparent cooling liquid such as an ethylene glycol aqueous solution in an airtight container whose front and rear surfaces are transparent.
Is always forcibly cooled to prevent the temperature rise of the liquid crystal display panel 12 due to the radiation heat from the light source 8.

As shown in FIGS. 1 and 2, the lens moving mechanism 16 is positioned vertically on the inside of the case 2 by being positioned on both sides of the intermediate portion between the arrangement positions of the condenser lens 13 and the projection lens 14. Two screw shafts 17,1
7 and an elevating / lowering body 18 which is moved up and down by the rotation of the screw shafts 17 and 17. The screw shafts 17 and 17 are each screw shafts 17 and 17 by manually rotating one of them. The pulleys 17a at the upper end of the belt 17 and the belt 19 wound around the belt 17 are rotated synchronously.

20 is the screw shaft 17, 17
The operation knob 20 is fixed to the outer end of a rotary shaft 21 that penetrates one side wall of the case 2, and the inner end of the rotary shaft 21 is provided with the one screw. A bevel gear 22 that is fixed to the bevel gear 23 that is fixed to the lower end of the shaft 17 is fixed.

The elevating body 18 has a pair of left and right horizontal arms 18a and 18a which are respectively screwed into the screw shafts 17 and 17 at an intermediate portion thereof and are elevated and lowered by the rotation of the screw shafts 17 and 17, and both arms 18a and 18a.
a and 18a, a condenser lens holding frame 18b fixed on both sides to the rear ends thereof, and a projection lens holding barrel 18c fixed on both ends to the ends of the arms 18a, 18a.
The condenser lens 13 is the condenser lens holding frame 1 of the lifting body 18.
8b, the projection lens 14 is provided in a lens barrel 14a held by a projection lens holding barrel 18c of the lifting body 18.

That is, the lens moving mechanism 16 includes the condenser lens 13 and the projection lens 14 in the liquid crystal display panel 12.
Is moved in parallel in the height direction (vertical direction) of the display screen, and the condensing lens 13 keeps the state of facing the screen of the liquid crystal display panel 12 even when the condensing lens 13 is moved up and down. In addition, the diameter is sufficiently larger than the display screen of the liquid crystal display panel 12 (in this embodiment, the diameter is almost twice the height of the display screen of the liquid crystal display panel 12).

Further, the lens barrel 14a is screwed into the projection lens holding barrel 18c, and the projection lens 14 forms a focused projection image on the screen surface by rotating the lens barrel 14a. Be moved back and forth.

The liquid crystal projector irradiates the liquid crystal display panel 12 with the light source 8 and projects the display image of the liquid crystal display panel 12 on the screen surface arranged in front of the projector body 1 as an enlarged image. Of the projection light (parallel light) enters the liquid crystal display panel 12 through the transparent window 6 of the heat insulating wall 5 and the display panel cooler 15, and the light transmitted through the liquid crystal display panel 12, that is, the display of the liquid crystal display panel 12 The image is condensed on the projection lens 14 by the condenser lens 13 and enlarged on the screen surface by the projection lens 14.

In the liquid crystal projector, however, the condenser lens 13 and the projection lens 14 are moved so that the lenses 13 and 14 are integrally moved in parallel in the height direction of the display screen of the liquid crystal display panel 12. Since it is supported by the mechanism 16, by moving the condenser lens 13 and the projection lens 14 by the lens moving mechanism 16, the projection direction can be arbitrarily changed according to the height of the screen without tilting the entire projector body 1. be able to.

That is, when the screen is installed at the same height as the projector body 1 and the display image of the liquid crystal display panel 12 is projected on the screen surface, as shown in FIG. 2, the condenser lens 13 and the projection lens 14 are used. It suffices that the center of the liquid crystal display panel 12 is moved to a height such that its center is at the same height as the center of the display screen of the liquid crystal display panel 12. By doing so, the display image of the liquid crystal display panel 12 is the same as that of the projector main body 1. It can be projected on a screen (not shown) installed at a height.

When the screen S is installed diagonally below the projector body 1 as shown in FIG. 3 and the display image of the liquid crystal display panel 12 is projected on the screen S surface,
It is sufficient to move the condenser lens 13 and the projection lens 14 downward as shown in the figure. In this case, the display image of the liquid crystal display panel 12 is condensed on the projection lens 14 by the upper portion of the condenser lens 13. , Is projected on the screen S surface by the projection lens 14.

In this case, in the liquid crystal projector, since the diameter of the condenser lens 13 is made sufficiently larger than the display screen of the liquid crystal display panel 12, the condenser lens 13 and the projection lens 14 are moved as described above. In this case, the entire display image of the liquid crystal display panel 12 is condensed on the projection lens 14 by the condenser lens 13 so that a complete image with no defects is displayed on the screen S.
It can be projected onto a surface.

This is also the case when the screen S is installed diagonally above the projector body 1 as shown in FIG. 4 and the display image of the liquid crystal display panel 12 is projected on the screen S. In this case, By moving the condenser lens 13 and the projection lens 14 upward, the display image of the liquid crystal display panel 12 is condensed on the projection lens 14 by the lower part of the condenser lens 13, and the projection lens 14 causes the screen S surface. Projected on.

Therefore, according to the liquid crystal projector, even when the screen S is installed obliquely below or above the projector body 1, the projection direction can be directed to the screen S without tilting the entire projector body 1.

In the above embodiment, the lens moving mechanism 1
Although the screw shafts 17 and 17 are used as the reference numeral 6, the lens moving mechanism is not limited to that of the above embodiment, and the lens moving mechanism may be an electric type.

Although the liquid crystal projector has been described in the above embodiments, the present invention is applicable to display panels other than the liquid crystal display panel (eg, electrochromic display panel).
It is needless to say that the present invention can be widely applied to a projection type display device that projects the display image of (1) on the screen surface.

[0028]

The projection type display device of the present invention has a projection lens.
Lens movement to move the lens system in parallel with the display panel surface
A mechanism is provided, and the projection lens system is attached to the display panel surface.
This projection type is designed for parallel movement.
According to the display device, the projection direction can be achieved without tilting the device body.
Can be changed arbitrarily, at which time the device body was tilted
The projected image cannot be distorted as in
Good focus on the body.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view of a lens moving mechanism portion of a liquid crystal projector according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of the liquid crystal projector.

FIG. 3 is a vertical sectional side view showing a state where the projection direction of the liquid crystal projector is changed obliquely downward.

FIG. 4 is a vertical cross-sectional side view showing a state in which the projection direction of the liquid crystal projector is changed obliquely upward.

[Explanation of symbols]

1 ... Projector body, 8 ... Light source, 12 ... Liquid crystal display panel, 13 ... Condensing lens, 14 ... Projection lens, 14 ... Lens barrel, 16 ... Lens moving mechanism, 17 ... Screw shaft, 18 ... Elevating body, 18a ... Elevating arm, 18b ... Condensing lens holding frame, 18c ... Projection lens holding tube, S ... Screen.

Claims (1)

(57) [Claims] 1. A projection lens system is arranged on a light emitting side of a display panel, and a display image of the display panel is displayed by the projection lens system.
In a projection type display device for enlarging and projecting on a screen surface, the projection lens system is moved in parallel with the display panel surface.
A lens moving mechanism is provided to allow the projection lens system to
A projection type display device characterized in that it can be moved in parallel to a display panel surface .