KR20000011866U - Projection tv - Google Patents

Abstract

The present invention relates to a projection television, the cathode ray tube mirror having a unique color of RED, GREEN, BLUE reflects the unique color by the light emitted from the lamp, the LCD panel has a By combining, a predetermined image is formed, and the image formed on the LCD panel is enlarged by the projection lens and then reflected through the reflector to appear on the screen, and inside the optical system main body consisting of a cathode ray tube mirror, an LCD panel, and a projection lens, A dust collector is installed to electrically remove foreign substances such as dust contained therein.

According to the present invention configured as described above, since the dust collector negatively charges the foreign matter and moves to the positive charge, the dust collecting device actively captures and removes the foreign matter, thereby eliminating the dust introduced during the production process, and also enables the removal of the fine particles. Foreign substances do not accumulate on LCD panel and reflector.

As a result, image quality defects such that foreign matters are formed on the screen and the color is discolored or the color is discolored may not occur, thereby improving reliability of the product.

Description

Projection tv

The present invention relates to a projection television, and more particularly, to a projection television to prevent foreign matter from being attached to devices such as LCD panels.

Recently, with the development of the information industry, the demand for image display means having a larger screen has been on the rise, but the direct view type cathode ray tube composed of a television receiver screen, which has been a general image display means, has a large cathode ray tube itself in order to enlarge the screen. Due to various realistic constraints that had to be produced, there was a limit to the degree of enlargement.

In addition, even if it is possible to produce a large-sized cathode ray tube to some extent by overcoming the technical difficulties described above, another limitation in producing a television set having a large cathode ray tube as a screen due to the increase in the load of the cathode ray tube Due to the technical difficulties due to factors, there was no limit to the production of a television having a large cathode ray tube on the screen.

Under these circumstances, the projected image projection system of a product such as a projection television or an audio projector has been developed and put into practical use as a way to obtain a larger screen by overcoming the difficulties of various technical factors.

Such an image projection system generates an image by means of image display means such as a specially made small cathode ray tube, a liquid crystal display device, or a polymer dispersed liquid crystal display panel, and enlarges the image by using an optical lens, for example, a projection lens. As a system of projecting on a large screen, the demand is increasing day by day in the advantage of obtaining a large screen that can meet the needs of consumers.

As described above, unlike a direct-view television receiver, a projection television necessarily requires a projection lens that enlarges a small image and projects it on a screen.

As shown in FIG. 1, a projection television, which is an example of such a projection image display device, is composed of a cabinet 10, an optical system, and a screen 30. The optical system is installed inside the main body 20 and the main body 20. Cathode ray tube mirrors 22, 23, 24, and respective cathode ray tube mirrors 22, which reflect respective intrinsic colors RED, GREEN, and BLUE by the light emitted from the lamp 21, and the light emitted from the lamp 21; And a projection lens 26 for enlarging an image formed on the LCD panel 25 and a projection lens 26 for enlarging an image formed on the LCD panel 25 by a combination of colors projected by (23) and (24). It may also include a reflector 27 for reflecting the image enlarged through the) to the screen 30.

The operating principle of the optical system will be described in more detail as follows.

First, when the optical system is driven, white light is emitted from the lamp 21, which is a light source, and the white light passes through the relay lens 28 and then through the collimating lens 29 to parallel light with each cathode ray tube mirror ( 22, 23, and 24 are projected.

Each cathode ray tube mirror 22, 23, 24 reflects light of a unique color, and the LCD panel 25 has a combination of light reflected from the cathode ray tube mirrors 22, 23, 24. Thus, a predetermined image is formed.

The image formed on the LCD panel 25 is magnified through the projection lens 26 to be projected onto the reflector 27, and the image reflected by the reflector 27 is displayed on the screen 30.

On the other hand, the lamp 21 emits high temperature heat together with light, which may cause durability and image quality degradation of the LCD panel 25, the reflector 27, and the projection lens 26 due to the high temperature heat. In order to eliminate the cooling fan 40 and the convection fan 41 by installing the outside air to circulate inside to cool the heat generated from the lamp 21.

At this time, foreign matters such as dust contained in the outside air may flow in. If the foreign matter gets on the LCD panel 25 and the reflector 27, the image quality is deteriorated, and the brightness of the light projected on the screen 30 is reduced. There was a problem that is lowered.

In order to solve this problem, the filter 50 is installed in the air hole to block foreign substances from entering.

The cooling fan 40 is installed inside a duct (not shown) connecting the optical system body 20 and the air hole to guide external air to flow into the optical system body 20, and the convection fan 41 is a projection television. It is installed in the cabinet 10.

However, in the conventional projection television configured as described above, although the dust flowing into the optical system main body 20 is blocked by the mechanical filter 50, since the blocking by the filter 50 is limited, there is a large amount of dust. Was introduced into the optical system body 20. As such, when dust flows into the optical system body 20, the following phenomenon occurs.

As the dust flows inside the optical system body 20, it is buried in the LCD panel 25 and the reflector 27. When the dust is deposited on the LCD panel 25, the size is enlarged through the projection lens 26 and the screen 30. In particular, when the background screen is white, since the image of the dust is more clearly seen, there is a problem that the reliability of the product is lowered.

In addition, the filter 50 removes dust contained in the air forcedly circulated by the driving force of the fan 40, 41. The filter 50 does not actively collect dust but is passively collected by air circulation. The dust contained in the incoming air can be removed, but there is a problem that the dust introduced into the projection television cabinet 10 during the production process of the product cannot be removed.

In addition, when cigarette smoke or the like is introduced into the optical system main body 20, the LCD panel 25 is yellowed, and the color of the image formed on the LCD panel 25 is discolored to be seen, thereby degrading durability and reliability of the product. .

The present invention was devised to solve the above-mentioned problems, and the phenomenon that dust appears on the screen by preventing foreign matters, such as dust, from entering the body of the optical system and the projection television cabinet, and the luminance of light reflected by the reflector is lowered. The aim is to provide a projection television that can improve the reliability of the product by preventing the phenomenon.

Another object of the present invention is to remove dust introduced into the projection television cabinet during the production process.

In addition, the purpose of the present invention is to effectively remove the gas such as cigarette smoke introduced into the optical body, so that the color of the image formed on the LCD panel is not discolored.

1 is a schematic configuration diagram of a projection television.

2 is a structural diagram showing a principle of operation of a projection television according to the prior art;

3 is a block diagram of an embodiment according to the present invention.

<Description of Signs of Main Parts in Drawings>

10: cabinet 20: optical system body

21 lamp 22,23,24 cathode ray tube mirror

25 LCD panel 26 Projection lens

27: reflector 30: screen

40,41: fan 60: dust collector

61,62: discharge part 63: dust collecting part

Projected television according to the present invention for achieving the above object, the image formed by the optical system is enlarged through the projection lens is projected on the screen, the cooling fan for guiding the outside air to enter the optical system main body is provided with a cooling fan Projection TV,

It is installed in close proximity to the optical system body, characterized in that it comprises an electrical dust collector for removing foreign substances such as dust contained in the air circulated by the cooling fan.

The dust collecting device includes a discharge part and a dust collecting part, wherein the discharge part is installed on a circulation path of air by the cooling fan, and the dust collecting part is preferably installed near the optical system while being spaced apart from the discharge part.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention in detail as follows.

Figure 3 is a configuration diagram showing an embodiment according to the present invention, the same reference numerals for the same components as the prior art for convenience of description.

Referring to FIGS. 2 and 3, the present invention projection television is composed of a cabinet 10, an optical system, and a screen 30, and the optical system is provided in the main body 20 and the main body 20. Lamp tube 21, cathode ray tube mirrors 22, 23, 24 for reflecting the respective intrinsic colors RED, GREEN, and BLUE by the light emitted from the lamp 21, and each cathode ray tube mirror 22 ( 23) and an LCD panel 25 in which a predetermined image is formed by the combination of colors reflected by the 24 and a projection lens 26 for enlarging an image formed on the LCD panel 25, and the projection lens 26 It includes a reflector 27 for reflecting the enlarged image through the screen 30 to form.

On the other hand, when the optical system is operated, the lamp 21 emits high temperature heat together with light. However, durability and image quality deterioration of the LCD panel 25, the reflector 27, and the projection lens 26 may occur due to the high temperature heat. Since the cooling fan 40 and the convection fan 41 may be installed to solve the problem, the heat generated by the lamp 21 is cooled by allowing the external air to circulate therein. The cooling fan 40 is installed inside a duct (not shown) connecting the air hole and the optical system body 20 to guide external air to flow into the optical system body 20, and the convection fan 41 is a projection television cabinet. (10) It is provided to circulate so that the air discharged from the optical system body 20 is discharged to the outside of the projection television cabinet 10.

In the projection television cabinet 10, a cottrell precipitator 60 composed of discharge parts 61 and 62 and a dust collecting part 63 is provided.

The first discharge portion 61 is attached to the cooling fan 40 inside the duct, the second discharge portion 62 is attached to the convection fan 41, and the dust collecting portion 63 is the front portion of the LCD panel 25. It is installed in to remove the foreign matter negatively charged by each discharge portion (61, 62).

In addition, a conventional filter 50 may be installed in the air hole through which air is introduced.

Referring to the working state of the embodiment according to the present invention configured as described above are as follows.

The driving of the optical system according to the present invention is the same as in the prior art and will be omitted.

When the cooling fan 40 is driven to cool the high temperature heat generated by the lamp 21, the outside air is introduced into the optical system body 20 through the air hole, and at this time, foreign substances are introduced by the filter 50. It does not flow in.

Subsequently, the air introduced into the optical system main body 20 cools the heat generated by the lamp 21 while circulating inside the optical system main body 20, and then is discharged to the projection television cabinet 10.

In addition, the inside of the cabinet 10 is circulated by the convection fan 41 and then discharged to the outside. As the air is continuously circulated, the heat inside the optical system body 20 is cooled.

On the other hand, the Cottrell dust collector 60 forms an unbalanced electric field with a high-pressure direct current and negatively charges particles such as dust contained in the air by using corona discharge in the electric field. After being collected in the dust collecting part 63 having a positive charge, it is electrically removed.

That is, the first discharge unit 61 negatively charges the foreign matter contained in the air introduced by the cooling fan 40, and the second discharge unit 62 is in the air circulating inside the projection television cabinet 10. The foreign matter included is negatively charged, and the foreign matter negatively charged through the discharge parts 61 and 62 is collected in the dust collecting part 63 having a positive charge and then removed.

In addition, gases, such as cigarette smoke, are also removed by the dust collector 60 similarly.

Therefore, the particulate matter having a diameter of 1 μm included in the air is also removed by the dust collector 60, so that dust does not adhere to the LCD panel 25 and the reflector 27 as in the prior art.

In addition, since the dust collector 60 actively captures and removes dust, it is possible to remove dust introduced during the production process.

As a result, since the dust is not accumulated on the LCD panel 25 and the reflector 27, dust does not appear on the screen 30 and the brightness of the light reflected by the reflector 27 does not occur.

In addition, since cigarette smoke and the like introduced into the optical system main body 20 are removed, the LCD panel is not discolored as in the prior art, thereby forming a clear color image on the screen 30.

As described above, according to the projection television of the present invention, since the dust existing inside the optical system body and the projection television cabinet can be effectively removed to obtain a clear image, the reliability of the product can be improved.

Claims (2)

In a projection television equipped with a cooling fan that is enlarged through the projection lens and the image formed by the optical system is projected on the screen, the outside air is introduced into the optical system body to cool the optical system, And an electrical precipitator which is installed in close proximity to the optical system and removes foreign substances such as dust contained in the air circulated by the cooling fan. The dust collecting device of claim 1, wherein the dust collecting device comprises a discharge part and a dust collecting part, the discharge part is installed on a circulation path of air by the cooling fan, and the dust collecting part is installed in the vicinity of the optical system while being spaced apart from the discharge part. Projection television, characterized in that the.