JP3321791B2 - LCD rear projection TV - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a video device including a liquid crystal display (hereinafter referred to as LCD), an optical unit including a projection lens, a light source and a mirror, and a screen mounted on the upper front side. Liquid crystal rear-projection television.

[0002]

2. Description of the Related Art A liquid crystal rear-projection television of this type can easily be made larger than a television using a CRT in that the depth can be reduced and the screen can be formed wider. For example, as shown in FIGS. Such a configuration is well known as a conventional example. The rear projection television 1 shown in FIG. 10 uses a wooden plate, forms the box into a box shape, configures the main body 2, and mounts the screen 3 on the front side of the main body. Is mounted, a mirror mounting portion 6 equipped with a mirror 5 is mounted on the rear side, and a bottom cabinet 7 provided with a video device, an electronic component, and the like for projecting a video is provided below the main body 2.
Are provided integrally.

The rear projection television 1 shown in FIG. 11 has a screen 3 in which a metal frame 8 of a predetermined shape is formed in an upright state on a bottom cabinet 7, and the frame 8 is wrapped from front and rear. The screen mounting portion 4 and the mirror mounting portion 6 having the mirror 5 are integrally mounted.

[0004] In any of these conventional examples, members that easily generate heat, such as a backlight and a drive circuit, are used.
Since it is built-in so that it coexists with video equipment including an LCD that is relatively heat-sensitive,
In order not to deteriorate the image quality, many air gaps are formed in order to improve the air permeability on the back side, and a fan for cooling air to cool the video equipment is provided. Since an image device including an LCD is installed, an intake port and an exhaust port are formed on the rear side, and a cooling air flow is made to make a U-turn to suck and exhaust.

[0005]

In the above-mentioned prior art, since the cooling airflow sucks outside air, a filter is attached to and detached from the intake port in order to prevent the internal devices from being contaminated with dust or smoke. It is installed freely, and the filter is often replaced, but the air intake is provided on the back side of the TV, and when replacing the filter, you have to move the TV and change the direction and replace the filter In addition, when the size of the television itself is increased, there is a problem that a moving operation for replacing the television is extremely troublesome.

In addition, since the rear projection television is formed as a single housing, the video equipment including the LCD, the screen, the mirror, and the like are mounted inside the housing in the same space as other components. In addition, it comes into contact with air flowing inside the housing, thereby causing dirt such as dust to adhere to optical components such as an LCD, a screen, and a mirror of a video device, thereby deteriorating a video display. ing.

[0007] Therefore, the conventional example has problems that must be solved in order to easily replace the filter, which often needs to be replaced, and to prevent deterioration of the image due to contamination of the optical system components.

[0008]

As a specific structure for solving the above-mentioned problems of the prior art, the present invention provides a screen in the front of a cabinet, a mirror inside, at least video equipment, a drive and control circuit, and a projection lens. A liquid crystal rear projection television equipped with a main component part comprising an optical unit and a light source, wherein a front side air flow path and a rear side air flow path are separately formed inside the cabinet, and air blowing means is provided near the center. The main component is disposed in the front airflow passage so that at least the video equipment faces the communication opening, and the rear airflow passage is provided on a side or front side of the cabinet. Air inlet that communicates with the air intake, and a filter that can be attached to and detached from the side or front of the air intake There is provided a liquid crystal rear projection television according to claim.

In addition to the above structure, an exhaust means for exhausting air to the rear side is provided in the front air flow path; the front air flow path and the rear air flow path are inclined from the front side to the rear side. And a cabinet constituting the television is divided into an upper cabinet equipped with a screen and a mirror, and a lower cabinet equipped with main components. That an upper cabinet of any size can be selectively assembled to the lower cabinet.

Inside the liquid crystal rear projection television, a front air flow passage and a rear air flow passage are separately formed and communicate with each other through a communication port provided with a blower in the vicinity of the center. The television is moved by arranging the main components in the front-side airflow passage so as to face the device, and providing an air intake communicating with the rear-side airflow passage on the side or front side of the cabinet. The filter at the air intake can be easily and frequently changed from the front side without dripping or turning, which removes dust from the outside air taken in for cooling and prevents contamination of internal equipment. Therefore, a clear image can be maintained for a long period of time.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the illustrated embodiments. First, in the embodiment shown in FIGS. 1 to 4, the liquid crystal rear projection television includes an upper cabinet 11 and a lower cabinet 12 so that the upper cabinet 11 and the lower cabinet 12 can be vertically separated at an intermediate portion thereof. Is
Each is formed in an independent state, and the upper cabinet 11 is assembled to the lower cabinet 12.

The upper cabinet 11 has a rectangular frame portion 11a formed on the front side thereof, and a screen 13 is attached to the frame portion. And the upper wall 11
b, a side wall 11c, a back wall 11d, and a bottom wall 11e form a box shape having a hollow inside and a closed periphery as a whole, and a mirror 15 is attached to the inside of the back wall 11d via a pedestal 14. I have.

The top wall 11b, both side walls 11c, and the bottom wall 11e are inclined to the rear as a whole, and in particular, the rear wall 11d is a screen 13 attached to the front.
In consideration of the set positional relationship between the image and the reflection of the image by the projection lens to be described later, it is formed with a tilt angle calculated in advance, and a mirror mounting base 14 is formed inside the tilted rear wall 11d. The pedestal 14 can finely adjust the inclination angle of the mirror 15 to be attached.

Further, even if the pedestal 14 itself does not have a structure which can be finely adjusted, for example, an elastic member such as a spring, rubber or sponge is interposed in a mounting member such as a screw or a bolt to adjust the tightening force. Alternatively, the mirror 15 may be mounted while adjusting the mounting angle.

The bottom wall 11e has an opening 16 near the middle thereof, which faces a projection lens described later. This opening 16 is the only opening of the upper cabinet 11. Then, the lower cabinet 1 is provided on a part of the bottom wall 11e.
A flange 17 for connection with the second member 2 is formed so as to protrude.

The lower cabinet 12 has a screen 13 and a mirror 1 provided in the upper cabinet 11.
With the exception of 5, all necessary equipment for a liquid crystal rear projection television is provided. For example, a video device 1 including three LCDs 18 and a drive circuit as main components
9 and a projection lens 20 are disposed substantially in the center, and a light source 21 is detachably disposed at one of the left and right positions (in this embodiment, on the right side when viewed from the front) from the center, and the speaker portion 22 is provided. It is arranged on the left and right.

The LCD 18 uses, for example, three (RGB) small-sized / high-definition polysilicon TFT liquid crystal panels (1.35 inch / 512,880 dots) to achieve high image quality. This is a so-called optical unit including the lens 20 (see the specification of Japanese Patent Application No. 6-98381 filed by the same applicant). The drive circuit employs, for example, a printed circuit board on which a plurality of necessary electronic components are mounted. The light source 21 is, for example, a high-performance light-intensity discharge lamp (HID lamp / 100
W), the whole is made into a cartridge type and can be easily replaced from the front side.

These main components are the lower cabinet 1
2, the projection lens 20 is housed in an internal space 24 defined by a partition 23, and slightly projects from a through-hole 23 a provided at an upper portion of the partition 23 so that a focus operation can be performed from outside the partition 23. Is stored in.

The internal space 24 is formed by a support plate 25 disposed diagonally and a partition plate 26 having a concave portion in the length direction (right and left direction when viewed from the front) disposed on the rear side of the support plate 25. A passage 27 and a front air flow passage 28 are formed. These air flow passages 27 and 28 have a communication port 29 of a predetermined size and a fan 30 serving as a blower at a substantially central portion.
The LCD 18, the video equipment 19, the light source 21, and the like provided inside are cooled by a cooling air flow taken in from the outside.

That is, the video equipment 1 including the plurality of LCDs 18
9 is attached and supported in the vicinity of a communication port 29 substantially in the center of the support plate 25, and the air flow passage 27 on the rear side is connected to an air inlet 31 provided at a predetermined position on the front side (left side when viewed from the front). When the fan 30 of the blowing means is driven, outside air is taken in from the air inlet 31 through the air flow passage 27 on the back side, and the outside air is blown from the communication port 29 as a cooling airflow. Front side air flow passage 2
8, and three L sheets are added to the sent cooling air flow.
The CD 18 and the video equipment 19 come into contact and are cooled appropriately and continuously.

The cooling air flow sent out to the air flow passage 28 on the front side cools the LCD 18 and the video equipment 19, and then contacts the outside of the light source 21 downstream thereof,
The heat of the light source 21 is removed and emitted to the outside. This release
It is discharged on the back side of the lower cabinet 12.

The air inlet 31 is provided with an appropriate filter to remove smoke, dust and the like in the air. The filter is designed to remove smoke, dust and the like contained in the outside air. As a result, the internal air flow passage and various devices are prevented from being contaminated.

An operation panel section 32 is mounted near the center on the front side of the lower cabinet 12, so that various operations can be performed manually and operations can be performed by remote control. In addition, the light source 21, the speaker 22, and the air inlet 31 are entirely covered with a makeup grill 33 detachably disposed on the front side and are blindfolded, so that the appearance is improved as a whole. .

Therefore, by removing the grill 33 on the front side without shifting or moving the position where the liquid crystal rear projection television is installed, the light source 2 can be removed.
1 can be easily replaced, and the filter of the air inlet 31 can be easily replaced.

Further, the lower cabinet 12 includes a partition 23
On the back side of the circuit, various circuit groups 34 such as a circuit for inputting a high-definition signal by processing a video signal at a double speed, a circuit for improving the horizontal image quality, etc.
Are provided, and a rear cover 35 for protecting the circuit group and connecting with the upper cabinet 11 is attached.

The rear cover 35 is firmly attached to the lower cabinet 12 at a plurality of locations by attaching members 36 such as screws, and the upper cover 11 is also firmly attached to the upper cabinet 11 at a plurality of locations. Firmly attached by A plurality of grills 38 are formed on the side and rear surfaces of the rear cover 35 so that air can flow through a space between the rear cover 35 and the partition wall 23. Further, a part of the rear cover 35 is opened, and a terminal 39 is provided facing the opening, to which an external device, an antenna, and the like can be connected.

As described above, in the liquid crystal rear projection television, the upper cabinet 11 provided with the screen 13 and the mirror 15 for reflection and the lower cabinet 12 provided with other devices and circuits necessary for the television are formed so as to be separable. By doing so, the lower cabinet 1
The screen size of the upper cabinet 11 with respect to 2 can be arbitrarily selected.

That is, the lower cabinet 12 is made common, and the screen size of the upper cabinet 11 can be applied to any of, for example, 37 inches, 50 inches or more. Different TVs can be easily manufactured.

In this case, only adjustment of the optical system is required to match the inch size. That is, as shown in FIG. 5, the fact that the inch size of the television is changed means that the focal length (focus) of an image through the projection lens 20 becomes longer or shorter. The 37-inch screen 13 and the 50-inch screen 13a differ in the focus position of the projection lens 20 by the difference in inch size.
What is necessary is just to focus the projection lens 20 on that position.

The focus of the projection lens 20 provided on the lower cabinet 12 can be adjusted by operating the projection lens 20 from the outside before the upper cabinet 11 is mounted and assembled. By adjusting the focus so as to conform to the 37-inch screen 13 or the 50-inch screen 13a depending on the screen size of 11, the present invention can be easily applied to any inch size.

The air flow passages 27 and 28 are shown in FIG.
9 will be described in more detail with reference to FIGS. The partition wall 23 includes a front wall 40, a rear wall 41, and an upper wall 42.
Is provided at the upper part of the front wall 40, that is, an opening 43 having a part opened so that the video equipment 19 provided therein can be accessed from the front side during repair and inspection. .

The front and rear air flow passages 27 and 28 are formed by the support plate 25 and the partition plate 26 in the internal space 24 defined by the partition 23. The partition plate 26 is partially formed by itself. It is formed in a substantially trapezoidal cross-sectional shape protruding to the rear side, and its partition plate 26 is attached diagonally toward the rear side. Then, by attaching the support plate 25 so as to cover the trapezoidal concave portion from the front side, an air flow passage 28 on the front side and an air passage 27 on the back side are formed before and after the support plate 25, The side air flow passage 28 is formed relatively wide.

The air flow passages 27 and 28 formed before and after the support plate 25 are provided with a communication port 29 having a predetermined size at a substantially central portion thereof and communicated therewith. 30 to provide an air flow passage 27 on the rear side.
From the front to the front air flow passage 28, and the relatively wide front air flow passage 2
A video device 19 including the LCD 18 and a light source 21 on the 8 side
Etc. are attached.

In particular, the video equipment 1 including a plurality of LCDs 18
9 is attached to the airflow passage in the most air-permeable place, that is, the communication port 29 provided in the support plate 25, because it dislikes heat, and positively responds to the airflow blown by the fan 30 as the blowing means. It is designed to be in contact with and cooled.

As shown in FIGS. 7 and 8, the air flow passage 27 on the rear side communicates with an air inlet 31 provided in the front wall 40 of the cabinet via a duct 44. A trapezoidal lattice-like portion 45 is integrally formed so as to be drawn inward on the side of the portion, and by this lattice-like portion 45, it is possible to prevent a hand from accidentally intruding the inside from the duct 44 and to attach the lattice-like portion 45 By forming a trapezoidal shape, the porosity can be increased and the intake resistance can be reduced.

A frame 46 for attaching a filter is attached to the outer edge of the air inlet 31.
Are formed with a plurality of locking portions 47 formed of notched concave portions or the like. The filter 48 attached to the frame 46 is formed in a frame shape substantially corresponding to the frame, a fine-grained filter portion 49 is stretched over the entire surface, and the peripheral portion corresponds to the locking portion 47 respectively. A locking projection 50 is formed.

As described above, since the air inlet 31 is formed on the front side and the filter 48 is detachably attached to the air inlet 31, it is possible to easily check the degree of contamination of the filter 48 from time to time. At the same time, if the filter 48 is dirty, it can be replaced immediately.

Next, the flow of cooling air will be described with reference to FIG. In addition, a fan 51 serving as an exhaust unit facing the rear side is disposed above the air flow passage 28 on the front side.

When the switch of the liquid crystal rear projection television is turned on, the drive circuit of the video equipment 19 operates, and a predetermined video is projected on the screen 13 via the projection lens 20 as in the conventional example.

When the television is switched on, the light source 21 is turned on.
And the fans 30 and 51 are driven, and outside air is taken in from the air inlet 31 through the air flow passage 27 on the back side as indicated by arrows. The outside air is cleaned by a filter 48 and introduced as cooling air. The cooling air is blown out from the communication port 29 into the air flow passage 28 on the front side by the fan 30, and is sent to the plurality of LCDs 18. And directly acts on the video equipment 19 containing the same to continuously remove heat and act to cool it.

The cooling air sent to the front airflow passage 28 while cooling the LCD 18 and the video equipment 19 in this way further contacts the outside of the light source 21 on the downstream side, and removes the heat of the light source 21. Released to the outside. This discharge is actively performed by driving the exhaust fan 51, and is discharged obliquely upward on the back side of the lower cabinet 12. The flow of the cooling air flow has a unique S-shape as a whole. It becomes a flow.

By driving the exhaust fan 51, the cooling air is positively discharged from the air flow passage 28 on the front side, so that the air which has lost heat does not stay inside. It does not rise so much, and various adverse effects due to heat are eliminated in the equipment installed inside.

Also, since the exhaust air from the exhaust fan 51 is directed obliquely upward on the rear side, the air existing inside the rear cover 35 follows the flow of the exhaust air. Due to the so-called chimney effect, the air is dragged and exhausted to the outside, and a predetermined airflow is generated even in the interior surrounded by the rear cover 35, and the heat of the circuit units and various electronic components disposed therein is taken away. Thus, the overheating phenomenon does not occur.

In the above description, the embodiment in which the upper cabinet 11 and the lower cabinet 12 can be separated has been described. However, the present invention is not limited to this. It goes without saying that the invention is applicable.

In short, an LCD and a drive circuit therefor are formed with an airflow passage in a predetermined direction inside a cabinet constituting the rear projection television, and particularly dislike heating the equipment provided therein. And the like are arranged facing the air flow passage, and are intensively and actively cooled so as to prevent deterioration of quality of those devices due to heat.

[0046]

As described above, the liquid crystal rear projection television according to the present invention is provided with a screen in front of a cabinet, and has a mirror inside, an optical unit including at least video equipment, a driving and control circuit, a projection lens, and a light source. A liquid crystal rear-projection television equipped with a main component consisting of: The main component is disposed in the front airflow passage so that at least the video equipment faces the communication port, and an air intake communicating with the rear airflow passage on the side or front side of the cabinet. A configuration in which an inlet is provided and a filter that can be attached to and detached from the side or the front side of the air intake is provided By the, the main components are disposed on the front side with access from the front side, in a state in which established the LCD rear-projection televisions,
It has an excellent effect that the filter can be easily replaced.

Further, by providing exhaust means for exhausting air to the rear side in the front air flow path, the cooling air in the front air flow path in which the main components are disposed is positively exhausted to the outside. As a result, the cooling air that has taken heat inside does not stagnate, so that there is an excellent effect that the internal temperature is not increased.

Further, the front side air flow passage and the back side air flow path are constituted by a support plate and a partition plate which are provided to be inclined from the front side to the back side, so that the structure is simple and the whole is formed. It has an excellent effect that it can be formed thin.

Further, the cabinet constituting the television is divided into an upper cabinet equipped with a screen and a mirror, and a lower cabinet equipped with main components, and the upper cabinet having an arbitrary size with respect to the lower cabinet. Has an excellent effect that the lower cabinet can be used in common and a television having a different screen size can be easily manufactured by replacing the upper cabinet.

[Brief description of the drawings]

FIG. 1 is a front view showing a liquid crystal rear projection television according to a first embodiment of the present invention.

FIG. 2 is a side view of the liquid crystal rear projection television according to the embodiment.

FIG. 3 is a rear view of the liquid crystal rear projection television according to the embodiment.

FIG. 4 is a schematic sectional view showing the liquid crystal rear projection television according to the embodiment separated into an upper cabinet and a lower cabinet.

FIG. 5 is an explanatory diagram showing a principle of focusing of a projection lens in a liquid crystal rear projection television.

FIG. 6 is an enlarged sectional view of a main part in the embodiment.

FIG. 7 is an enlarged sectional view of an air intake portion in the embodiment.

FIG. 8 is a schematic perspective view showing only main components in the embodiment separately for easy understanding.

FIG. 9 is a schematic diagram for explaining a flow of cooling air in the embodiment.

FIG. 10 is an exploded perspective view showing an example of a conventional rear projection television.

FIG. 11 is an exploded perspective view showing another example of the rear projection television in the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Upper cabinet 11a Frame 11b Top wall 11c Side wall 11d Back wall 11e Bottom wall 12 Lower cabinet 13, 13a Screen 14 Mirror mounting base 15 Mirror 16 Opening 17 Flange 18 LCD 19 Video equipment 20 Projection lens 21 Light source 22 Speaker Reference Signs List 23 partition wall 23a through hole 24 internal space 25 support plate 26 partition plate 27, 28 air flow passage 29 communication port 30 fan (air supply means) 31 air intake 32 operation panel unit 33, 38 grill 34 circuit group 35 rear cover 36, 37 Mounting member 39 Terminal 40 Front wall 41 Back wall 42 Top wall 43 Opening 44 Duct 45 Lattice 46 Frame 47 Locking section 48 Filter 49 Filter section 50 Locking projection 51 Fan (exhaust means)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-153127 (JP, A) JP-A-9-98358 (JP, A) JP-A-6-113238 (JP, A) 68578 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 5/74 H04N 5/64 H05K 7/20

Claims (4)

(57) [Claims] 1. A liquid crystal rear projection television provided with a screen provided in front of a cabinet, and internally provided with a mirror, and at least main components including a video device, a driving and control circuit, an optical unit including a projection lens, and a light source. Inside the cabinet, a front airflow passage and a rear airflow passage are separately formed and communicate with each other through a communication port provided with a blower in the vicinity of the center, so that at least video equipment faces the communication port. The main components are disposed in a front airflow passage, and an air intake communicating with the rear airflow passage is provided in a side surface or a front surface of the cabinet. A liquid crystal rear-projection television, provided with a filter that can be used. 2. The liquid crystal rear projection television according to claim 1, wherein exhaust means for exhausting air to the rear side is provided in the front air flow passage. 3. The front air flow passage and the rear air flow passage are constituted by a support plate and a partition plate which are provided to be inclined from the front side to the back side. LCD rear projection TV. 4. A cabinet constituting a television is divided into an upper cabinet equipped with a screen and a mirror, and a lower cabinet equipped with main components, and an upper cabinet of an arbitrary size is provided for the lower cabinet. The liquid crystal rear projection television according to claim 1, wherein the television can be selectively assembled.