JPH06235899A - Projection type liquid crystal display device - Google Patents

Abstract

(57) [Summary] [Purpose] It can be used indoors where there is no space to install an external screen or outdoors that is easily affected by sunlight, and even if the rear body case is slid to the rear side, it is a cooling fan. Provided is a projection-type liquid crystal display device in which the cooling effect of the device does not deteriorate. A partition plate 64 is provided on both sides of the projection optical system 10, and the partition plate 64 partitions the inside of the rear side main body case 4 back and forth.

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.

[0002]

2. Description of the Related Art Generally, an external projection type projection type liquid crystal display device for enlarging and displaying an image displayed on a liquid crystal display panel on an external screen (reflection type screen) uses a projection source such as a liquid crystal display panel. It has in the main body case,
Pixel light emitted from this projection source is projected onto an external screen via a projection optical system. Further, this type of projection type image display device has a projection hole in the front of the main body case, and the image light is emitted from the projection hole to project and display an image image on an external screen.

However, the projection type liquid crystal display device as described above is of an external projection type in which image light is emitted from a projection hole provided on the front surface of the main body case to project and display an image on an external screen. There is a problem in that it cannot be used indoors where there is no space to install, or outdoors where it is easily affected by sunlight.

Therefore, in order to solve such a problem, the main body case is formed of a front side main body case and a rear side main body case that is slidable in the front-rear direction with respect to the front side main body case. A main body cover is rotatably provided at the front end of the case, a screen frame holding a transmissive screen is rotatably provided at the rear end of the rear side main body case, and a slide cover is provided at the bottom of the main body cover back and forth. Slidable in the direction, guide pins that engage with guide grooves formed on the inner surface of the main body cover on the left and right outer surfaces of the slide cover, or guide grooves that engage with guide pins formed on the left and right inner surface of the main body cover. And a guide boss that engages with guide grooves formed on the left and right inner side surfaces of the slide cover on the left and right outer side surfaces of the screen frame. In the vicinity of the projection optical system that provides guide grooves that engage with the guide bosses formed on the left and right inner side surfaces of the slide cover and that projects image light onto the external screen from the projection holes provided on the front surface of the front body case. The reflector is provided with the reflecting surface inclined obliquely upward, and the reflector is moved to the front side of the projection optical system in response to the sliding movement of the front side main body case to the front side of the projection optical system, and the image light from the projection optical system is received. A projection type liquid crystal display device in which the light is reflected toward a transmissive screen has been considered.

[0005]

However, such a projection type liquid crystal display device has the following problems. That is, in the above-described projection type liquid crystal display device, when the rear side main body case is slid to the rear side, the volume inside the main body case increases, so that the cooling effect of the cooling fan provided in the rear side main body case decreases. There was a problem.

The present invention has been made in view of the above problems, and an object thereof is to be used in a room without a space for installing an external screen or in an outdoor environment that is easily affected by sunlight, and at the rear. An object of the present invention is to provide a projection type liquid crystal display device in which the cooling effect of the cooling fan does not deteriorate even if the side body case is slid to the rear side.

[0007]

In order to solve the above-mentioned problems, a projection type liquid crystal display device according to the present invention has a front side main body case having a projection hole in the front surface, and a front and rear direction with respect to the front side main body case. A slidable rear main body case, a main body cover rotatably supported at an upper edge of a front end of the front main body case, a liquid crystal display panel provided in the rear main body case, and the rear side A backlight device provided in the body case for illuminating the liquid crystal display panel from the rear side, a projection optical system for enlarging and projecting an image displayed on the liquid crystal display panel onto an external screen through the projection hole, and the body. Guide pins that are slidable inside the cover and that engage with guide grooves formed on the left and right inner side surfaces of the body cover, or formed on the left and right inner side surfaces of the body cover A slide cover having guide grooves on left and right outer surfaces for engaging with the guide pins formed on the left and right sides, and a guide formed on left and right inner side surfaces of the slide cover rotatably supported by an upper edge of a rear end of the rear body case. A screen frame having guide bosses engaging with the grooves or guide grooves engaging with the guide bosses formed on the left and right inner side surfaces of the slide cover on the left and right outer surfaces; a transmissive screen held by the screen frame; A reflector provided in the vicinity of the projection optical system and having a reflecting surface inclined obliquely upward, and a reflector that moves to the front side of the projection optical system in response to a sliding operation to the rear side of the rear side main body case. And a reflector moving mechanism that makes the reflecting surface of the reflector face the projection optical system,
The rear side main body case is provided with a cooling fan for radiating heat generated from the backlight device to the outside, and partition plates provided on both sides of the projection optical system to partition the inside of the rear side main body case into front and rear. It is characterized by having done.

[0008]

In the present invention, partition plates are provided on both sides of the projection optical system, and the partition plates partition the inside of the rear-side main body into front and rear parts, so that the cooling effect of the cooling fan can be prevented from lowering.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to.

FIG. 1 is a plan view of a projection type liquid crystal display device according to an embodiment of the present invention, and FIG. 2 is a side view thereof. Also,
3 is a sectional view taken along the line AA of FIG. 2, and FIG. 4 is a sectional view taken along the line BB of FIG.

1 to 4, reference numeral 1 denotes a projection type liquid crystal display device according to an embodiment of the present invention. The projection type liquid crystal display device 1 includes a front side main body case 2 and a rear side main body case 4. I have it. The front side main body case 2 is open on the upper side and the rear side, and a projection hole 3 is formed in the center of the front surface. On the other hand, the rear side main body case 4 is open at the upper side and the front side and is slidable in the front-back direction with respect to the front side main body case 2.

Further, the projection type liquid crystal display device 1 is provided with a main body cover 5 for covering upper openings and left and right side surfaces of the front main body case 2 and the rear main body case 4. The main body cover 5 is rotatably supported by hinges 6 and 6 provided at the upper edge of the front end of the front side main body case 2, and can be rotated upward with these hinges 6 and 6 as fulcrums. Has become.

The projection type liquid crystal display device 1 further includes a liquid crystal display panel 7 for displaying a projection image projected on an external screen (not shown) through a projection hole 3 formed in the front center of the front side main body case 2. A backlight device 9 is provided to illuminate the liquid crystal display panel 7 from the back side via a condenser lens 8. The liquid crystal display panel 7 and the backlight device 9 are arranged in the rear main body case 3, and the projection optical system 10 is provided on the front side of the liquid crystal display panel 7.
Is provided.

Although not shown, the backlight device 9 is composed of a high-intensity lamp such as a metal halide lamp and a parabolic reflector that reflects the emitted light generated by the high-intensity lamp forward. There is.

The projection optical system 10 includes a liquid crystal display panel 7
Is for projecting the image light from the image projection apparatus 3 on the external screen in an enlarged manner through the projection hole 3. As shown in FIG. 5, a plurality of projection lenses 11 ... And a lens holder 12 for holding these projection lenses 11 ... And a lens holder 1
2 is provided with a lead nut 14 of a focus adjusting mechanism 13. A lead screw 15 is screwed into the lead nut 14, and by rotating the lead screw 15, the lens holder 12 is moved along the guide rod 16 in the front-rear direction.

As shown in FIG. 6, the focus adjusting mechanism 13 is provided with a focus adjusting knob 17 provided on the front surface of the front side body case 4 and rotation of the focus adjusting knob 17 via gears 19a, 19b and 19c. The lead screw 15
And a focus adjustment shaft 18 for transmitting to the guide grooves 20a, 20 on both sides of the focus adjustment shaft 18.
b is formed along the axial direction. These guide grooves 20a, 20b are for allowing the focus adjusting shaft 18 to move in the axial direction, and as shown in FIG. 7, a slide guide 21a, formed on the inner peripheral surface of the gear 17a,
21b is slidably engaged.

Further, the projection type liquid crystal display device 1 is provided with a slide cover 22 below the main body cover 5. The slide cover 22 is slidable in the front-rear direction with respect to the main body cover 4, and the left and right inner side surfaces of FIG.
Click mechanisms 23, 23 are provided as shown in FIG. These click mechanisms 23, 23 are for locking the slide cover 22 at a predetermined position, and are configured to include a locking pin 24 and click plates 28, 31 as shown in FIG.

The locking pin 24 also serves as a guide pin of the slide cover 22, and is inserted into a through hole 25 formed in the slide cover 22 to engage with a guide groove 26 formed on the inner surface of the body cover 4. is doing. Click plate 28
Is for engaging the locking pin 24 with a recess 27 (see FIG. 8) provided at the upper edge of the rear end of the guide groove 26, and is rotated by a shaft 29 provided on the inner surface of the slide cover 22. It is rotatably supported and is biased counterclockwise in the figure by a spring (not shown). On the other hand, the click plate 31 is for restricting the movement of the click plate 28, is rotatably supported by a shaft 32 provided on the inner surface of the slide cover 22, and is rotated counterclockwise in the figure by a spring (not shown). Biased in the direction. The click plate 31 has a click plate 2
An engaging portion 31a that engages with the claw portion 28a provided on the No. 8 is provided.

The projection type liquid crystal display device 1 further includes a screen frame 34 holding a transmissive screen 33 below the slide cover 22. This screen frame 3
Reference numeral 4 denotes a hinge portion 35 provided at the upper edge of the rear end of the rear side body case 4, the rear end of which is rotatably supported.
As shown in FIG. 10, locking projections 36 and locking pins 37 are provided on the left and right outer surfaces, and engage with guide grooves 39 (see FIG. 8) formed on the left and right inner side surfaces of the slide cover 22. A guide boss 38 is provided.

The locking projection 36 is engaged with a notch 40 (see FIG. 8) provided on the click plate 28, and is disengaged from the notch 40 when the rear body case 4 is slid rearward. It is like this. On the other hand, the locking pin 37
Is a bent portion 41 provided on the click plate 31 (see FIG. 8)
When the rear main body case 4 is slid rearward and the screen frame 35 is rotated upward, the rear frame 4 is disengaged from the bent portion 41.

Further, the projection type liquid crystal display device 1 is provided with a pair of light shielding plates 43, 43 on the lower surface side of the screen frame 34. These light shielding plates 43, 43 are for shielding both sides of the transmissive screen 33, and as shown in FIGS. 11 and 12, hinge portions 44, 44 provided at the upper end of the side surface of the rear body case 4. Is rotatably pivoted to
It is biased upward by a spring (not shown).

Further, the projection type liquid crystal display device 1 has a reflector 45 near the projection optical system 10. As shown in FIG. 13, the reflector 45 includes a mirror 46 whose reflection surface is inclined obliquely upward and a mirror holder 47 which holds the mirror 46. The mirror holder 47 is a bottom surface of the front side main body case 2. The shaft 48 is rotatably supported by a shaft 48 provided in the section, and is biased counterclockwise in the figure by a spring (not shown).

Further, the projection type liquid crystal display device 1 is provided with a reflector moving mechanism 49 which moves the reflector 45 to the front side of the projection optical system 10 in response to the rearward sliding of the rear body case 4. ing. As shown in FIG. 13, the reflector moving mechanism 49 includes a fixed post 50 provided on the bottom surface of the front body case 2, and a first slide plate 51a having a front end fixed to the fixed post 50. , This first
And a second slide plate 51b arranged below the slide plate 51a of FIG.
Rack gears 52a and 52b are provided at one side edge of 1b. A two-stage gear 53 rotatably provided on the bottom surface of the rear body case 4 is engaged with these rack gears 52a and 52b. The two-stage gear 53, as shown in FIG. Lower gear 5 that engages with
3b is the upper gear 5 that engages with the rack gear 52a.
The gear ratio is set to be larger than that of 3b.

In addition, oval slits 54a and 54b are formed in the central portions of the slide plates 51a and 51b along the front-rear direction, and these slits 54a and 5b are formed.
Guide pins 55a and 55b provided on the bottom surface of the rear body case 4 are slidably engaged with the inside of 4b.

Further, the reflector moving mechanism 49 is shown in FIG.
As shown in, a slide pin 57 that slides in a slit 56 provided at the front end portion of the second slide plate 51b.
And a shaft 5 for rotatably supporting the reflector drive plate 58 on the bottom surface of the rear body case 4.
9 and the reflector drive plate 58 has a reflector 4
An oval slit 61 that slidably engages with a slide pin 60 provided on the mirror holder 47 of No. 6 is formed.

Further, the projection type liquid crystal display device 1 is provided with a cooling fan 62 in the rear side main body case 4. The cooling fan 62 transfers heat generated from the liquid crystal display panel 7 and the backlight device 9 from the ventilation holes 63 provided on the left and right side surfaces of the rear body case 4, the body cover 5, the slide cover 22 and the screen frame 34. Although not shown in the figure, the fan is attached to the rotating shaft of the motor.

Further, the projection type liquid crystal display device 1 is provided with partition plates 64 in the rear side main body case 4. These partition plates 64, 64 are for partitioning the inside of the rear side main body case 4 into front and rear, and are provided on both sides of the projection optical system 10.

In the projection type liquid crystal display device 1 configured as described above, when the rear side main body case 4 is slid to the rear side as shown in FIG. 15, the two-stage gear 53 of the reflector moving mechanism 49 is displayed. 13 Middle counterclockwise rotation, this two-stage gear 53
By the counterclockwise rotation of the second slide plate 51b.
Slides to the front. Then, the second slide plate 51
When b slides to the front side, the slide pin 57 provided on the reflector driving plate 58 moves to the rear end of the slit 56 and is located in the recess 56a provided at the rear end of the slit 56. As a result, the mirror holder 47 of the reflector 45 is rotated counterclockwise in FIG. 13 by the urging force of a spring (not shown), and the rotation of the mirror holder 47 causes the mirror 46 to rotate.
The reflecting surface of is opposed to the projection optical system 10 (see FIG. 20).

Next, after sliding the rear side main body case 4 to the rear side, the screen frame 34 is rotated upward as shown in FIG. 16, and the locks provided on the left and right outer side surfaces of the screen frame 34 are locked. The protrusion 36 separates from the notch 40 provided on the click plate 28 (see FIG. 17A). As a result, the click plate 28 is moved by the urging force of a spring (not shown).
7 Rotate in the counterclockwise direction and lock the locking pin 24 also serving as the guide pin into the recess 27 provided at the upper edge of the rear end of the guide groove 26.
Engage with. Further, when the screen frame 34 is rotated further upward, the locking pins 37 provided on the left and right outer surfaces of the screen frame 34 are separated from the bent portion 41 provided on the click plate 31 (FIG. 17B). reference). As a result, the click plate 31 is rotated counterclockwise in FIG. 17 by the urging force of a spring (not shown), and the locking portion 31a provided on the click plate 31 engages with the claw portion 28a provided on the click plate 28. The movement of the slide cover 22 is restricted.

After sliding the rear side main body case 4 to the rear side and then rotating the screen frame 34 upward,
The transmissive screen 33 held by the screen frame 34 appears on the rear side of the rear body case 2 (see FIGS. 18 and 19). In this state, when the image displayed on the liquid crystal display panel 7 is illuminated from the back side by the backlight device 9, the image light emitted from the liquid crystal display panel 7 strikes the mirror 46 of the reflector 45 that has moved to the front side of the projection optical system 10. . Then, the image light striking the mirror 46 is reflected obliquely upward and projected on the transmissive screen 33.

Therefore, in the projection type liquid crystal display device 1 configured as described above, the image light projected on the external screen from the projection hole 3 provided on the front surface of the front side main body case 2 is projected on the transmission type screen 33. You can
It can also be used indoors where there is no space to install an external screen or outdoors where it is susceptible to sunlight.

Further, in the projection type liquid crystal device 1 configured as described above, since the partition plates 64 for partitioning the inside of the rear side main body case 4 into front and rear are provided on both sides of the projection optical system 10,
The volume of the rear body case 4 can be kept constant.
Therefore, even if the rear main body case 4 is slid to the rear side, the volume of the rear main body case 4 can be kept constant, and the efficiency of the cooling fan can be prevented from being lowered due to the change in volume.

In the above embodiment, the locking pins 24 also serving as guide pins that engage with the guide grooves 26 formed on the left and right inner side surfaces of the body cover 4 are provided on the left and right outer side surfaces of the slide cover 22. Guide grooves may be provided on the left and right outer surfaces of the cover 22, and guide pins that engage with the guide grooves may be provided on the left and right inner side surfaces of the main body cover 4.

Further, in the above embodiment, the slide cover 22 is used.
Although the guide bosses 40 that engage with the guide grooves 39 formed on the left and right inner side surfaces of the screen frame 34 are provided on the left and right outer surfaces of the screen frame 34, the guide grooves are provided on the left and right outer surfaces of the screen frame 34.
The slide cover 2 is provided with a guide boss that engages with this guide groove.
It may be provided on the left and right inner side surfaces of 2.

[0035]

As described above, according to the present invention, partition plates are provided on both sides of the projection optical system, and the partition plates partition the inside of the rear side main body into front and back, thereby providing a space for installing an external screen. A projection-type liquid crystal display device that can be used indoors or outdoors that is easily affected by sunlight, and that does not reduce the cooling effect of the cooling fan even when the rear body case is slid to the rear side. it can.

[Brief description of drawings]

FIG. 1 is a plan view of a projection type liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a side view of the projection type liquid crystal display device according to the embodiment.

FIG. 3 is a front view of the projection type liquid crystal display device according to the embodiment.

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

5 is a sectional view taken along line BB of FIG.

FIG. 6 is a diagram showing a configuration of a focus adjustment mechanism shown in FIG.

7 is a sectional view taken along line CC of FIG.

FIG. 8 is a sectional view taken along line DD of FIG.

9 is a diagram showing a configuration of a click mechanism shown in FIG.

10 is a cross-sectional view taken along line EE of FIG.

11 is a sectional view taken along line FF of FIG.

12 is a sectional view taken along line GG of FIG.

FIG. 13 is a diagram showing a configuration of a reflector and a reflector moving mechanism shown in FIG.

14 is a sectional view taken along line HH of FIG.

FIG. 15 is a side view showing a state where the rear body case of the projection type liquid crystal display device according to the embodiment is slid rearward.

FIG. 16 is a side view showing a state where the screen frame of the projection type liquid crystal display device according to the example is turned upward.

17 is an explanatory view of the action of the click mechanism shown in FIG.

FIG. 18 is a rear view of the projection type liquid crystal display device shown in FIG.

19 is a cross-sectional view taken along the line I-I of FIG. 18.

20 is a cross-sectional view taken along line JJ of FIG.

[Explanation of symbols]

 2 ... Front side main body case 3 ... Projection hole 4 ... Rear side main body case 5 ... Main body cover 7 ... Liquid crystal display panel 8 ... Backlight device 10 ... Projection optical system 13 ... Focus adjustment mechanism 22 ... Slide cover 23 ... Click mechanism 24 ... Locking pin 26 ... Guide groove 33 ... Transmissive screen 34 ... Screen frame 39 ... Guide groove 40 ... Guide boss 43 ... Shading plate 45 ... Reflector 49 ... Reflector moving mechanism 62 ... Cooling fan 64 ... Partition plate

Claims (1)

[Claims] 1. A front-side main body case having a projection hole on the front surface, a rear-side main body case that is slidable in the front-rear direction with respect to the front-side main body case, and a front end upper edge portion of the front-side main body case. A freely coverable body cover, a liquid crystal display panel provided in the rear side body case, a backlight device provided in the rear side body case and illuminating the liquid crystal display panel from the back side, A projection optical system for enlarging and projecting an image displayed on a liquid crystal display panel onto an external screen through the projection hole, and a guide groove slidably provided inside the main body cover and formed on left and right inner side surfaces of the main body cover. A slide pin having guide grooves for engaging with a guide pin or guide grooves formed on left and right inner side surfaces of the main body cover on left and right outer surfaces A guide boss that is rotatably supported on the upper edge of the rear end of the rear body case and that engages with guide grooves formed on the left and right inner side surfaces of the slide cover, or on the left and right inner side surfaces of the slide cover. A screen frame having guide grooves on left and right outer surfaces that engage with guide bosses, a transmissive screen held by the screen frame, and a reflector provided in the vicinity of the projection optical system and having a reflecting surface inclined obliquely upward. And a reflector moving mechanism that moves the reflector to the front side of the projection optical system in response to the rearward sliding movement of the rear body case so that the reflection surface of the reflector faces the projection optical system. A cooling fan provided inside the rear side main body case for radiating heat generated from the backlight device to the outside; and inside the rear side main body case provided on both sides of the projection optical system. Projection-type liquid crystal display device being characterized in that includes a partition plate for partitioning the front and rear.