KR20020008904A - The isolating structure of dust for LCD projector - Google Patents

Abstract

PURPOSE: A device for preventing dust in a LCD(Liquid Crystal Display) projector is provided to prevent dust from being attached into a LCD panel while stopping the LCD projector and to improve picture of a screen. CONSTITUTION: A device for preventing dust of a LCD projector comprises an optical engine(10) having an imaging portion and a lamp assembly; a filter supporting lip(40) fixing the filter to prevent inlet of dust by being mounted on both sides of the imaging portion; an upper protrusion(41) fixing the filter on an upper portion of the lip; a lower protrusion(42) fixing the filter on a lower portion of the lip; a filter(44) covering the upper portion; and a filter cover(45) protecting the filter. The filter cover is composed of PVC(Poly Vinyl Chloride) having elasticity by being mounted between the upper protrusion and the lower protrusion. Thereby, the device for preventing dust of the LCD projector prevents the dust from being attached into the LCD panel while stopping the LCD projector. Moreover, the device for preventing the dust of the LCD projector improves picture of a screen.

Description

Dust isolating device for LCD projector {The isolating structure of dust for LCD projector}

The present invention relates to an LCD projector that can project an LCD from the rear to enlarge the screen on the screen. More specifically, the image quality is improved by blocking dust inflow into the synthesis unit, which is an image part of the LCD projector. And dust preventing device of an LCD projector.

1 is a view showing a schematic configuration of a conventional LCD projector.

Referring to FIG. 1, a conventional LCD projector includes an optical engine unit 10 including a lamp assembly 11 for irradiating light and a synthesis unit 12 for forming an image, and a projection lens unit for refracting and diffusing light. 20, an intake fan 31 installed at the bottom of the LCD projector to suck outside air, and an exhaust fan 32 and the exhaust fan 32 installed at the rear of the LCD projector to discharge internally heated air to the outside. The lower case 30 is provided behind the exhaust grill 33 to protect the exhaust fan 32 is provided, the upper case (not shown) covering the upper surface and separated from the outside world.

Referring to the operation of the conventional LCD projector, the lamp assembly 11 generates light and irradiates the light, and the light emitted from the lamp assembly 11 undergoes a process of refraction or synthesis, wherein the synthesis unit ( The image formed on the LCD of 12) is projected, and the light projected on the synthesizing section 12 to include image information passes through the projection lens 20, and the direction of the light is adjusted to finally display the screen. Will form the screen.

In more detail, the synthesizing section 12, which is an image forming part, of the schematic configuration of the LCD projector will be described in detail. The synthesizing section 12 may include an LCD panel, which forms an image, and a prism that refracts or synthesizes light. Etc.

Referring to the operation of the synthesis unit of the LCD projector as described above, the LCD panel is composed of three LCD panels R, G, B having three colors of red, green, and blue, the light is irradiated from the back of the three panels The color-highlighted light is synthesized using a prism, and finally a screen is formed on the screen.

It is important that the composition part 12 of the LCD projector, especially the LCD panel, configured as such to form an image so as to be reliably blocked from external dust and the like. If dust or the like is formed on the LCD panel, it is displayed on the screen. Shapes of dust and the like appear on the screen in the same way, and the image quality is deteriorated, causing inconvenience to the user.

On the other hand, once again the structure of the LCD panel in conjunction with the cooling process, the air intake fan 31 is attached to the approximately bottom surface of the synthesis unit 12 to cool the heat of the LCD projector, the outside air suction Without the intake fan 31, heat is accumulated and liquid between the LCD panels boils, causing LCD boiling or a polarizing plate that appears black on the screen.

As described above, the synthetic part 12 is cooled by using the outside air introduced through the intake fan 31. The cooling process is described in connection with a process in which foreign substances such as dust are implanted on the LCD panel. When is in operation, the intake fan 31 is operated so that the outside air continues to flow into the synthesis system 12, and the heated outside air continues to be discharged so that there is no time for dust or the like to form the LCD panel.

However, when the LCD projector stops operating, circulation of air flowing through the intake fan 31 and exhausted through the exhaust fan 32 is also stopped, so that the exhaust grill 33 or the intake fan 31 is stopped. Through it, natural air flows in and foreign matters, such as dust, contained in it fall onto the panel by gravity.

Foreign matters such as dust, which have been formed through the above process, are eventually projected onto the screen on the screen the next time the LCD projector is driven, thereby causing inconvenience to the user.

In consideration of the problems described above, the dust inflow prevention device of the LCD projector according to the present invention prevents external dust, etc., from being formed on the LCD panel even when the LCD projector is in a stopped state, so as to make a better screen on the screen. It aims to do it.

1 is a view showing a schematic configuration of a conventional LCD projector.

Figure 2 is a view for explaining the fixing structure of the LCD projector dust inflow prevention apparatus according to the present invention.

Figure 3 is a view for explaining the filter structure of the LCD projector dust inflow prevention apparatus according to the present invention.

Figure 4 is a view showing a state in which the LCD projector dust inflow prevention apparatus according to the present invention is installed in the LCD projector.

<Description of the symbols for the main parts of the drawings>

10 ........... Optical engine section 11 ............ Lamp assembly

12 ........... Composition system 20 ............ Projection lens

30 .............. Lower case 31 ............ Intake fan

32 ........... Exhaust Fan 33 ............ Exhaust Grill

40 ........... Filter support rib 41 ............ Top projection

42 ........... Bottom projection 43 ............ PCD connector

44 ........... Dust Filter 44a ........... CD Connector Insertion Groove

45 .............. Filter cover 46 ............ Prism

47 ........... LCD Panel

Dust inflow prevention device of the LCD projector according to the present invention in order to achieve the above object is characterized in that the filter is installed on the upper side of the LCD projector synthesis system in order to block the inflow of dust and the like.

2 is a view for explaining the fixing structure in the dust inflow prevention apparatus of the LCD projector according to the present invention.

Referring to FIG. 2, the LCD projector includes an optical engine 10 including a lamp assembly 11 for irradiating light and a synthesis unit 12 for forming an image, and the synthesis unit 12 as in the related art. It can be roughly divided into the projection lens unit 20 that the light passing through is refracted to form a screen on the screen, and in addition to the LCD projector according to the present invention free fall from the upper side of the synthesis section 12 The structure of a certain shape is prepared to prevent the inflow of dust, which will be described in more detail.

On the left and right sides of the synthesis system 12, filter support ribs 40 are provided to fix a filter to prevent inflow of dust, and the filter support ribs 40 are provided with upper protrusions 41 to fix the filter from above. ) And several lower protrusions 42 for fixing the filter from the lower side are provided.

By adopting the above configuration, the filter is inserted between the filter support ribs 40 and is fixed between the upper protrusion 41 and the lower protrusion 42 so as not to be pulled out.

3 is a view for explaining a filter structure for preventing the inflow of dust and the like according to the present invention.

Referring to Figure 3, in the dust inflow prevention apparatus according to the present invention is a filter structure is a double, in detail, the dust filter 44, which is a porous blocking membrane of a soft material that can pass the outside air while filtering dust and And a filter cover 45 that protects and stores the dust filter 44 and serves as a shielding film in a trailing place where the dust filter 44 cannot cover, and the dust filter 44 includes an LCD panel. An LCD connector insertion groove 44a into which an LCD connector 43 for transmitting information about an image is inserted is processed, and air passing through the dust filter 44 can freely communicate with the filter cover 45. Three large holes are formed to allow this.

The prism 46 covered by the dust filter 44 and the filter cover 45 is provided under the dust filter 44, and the LCD panel 47 has three surfaces outside the prism 46. Three R, G, and B are provided over, and the filter according to the present invention is provided on the prism 46 and the LCD panel 47 to maintain the cleanliness by filtering dust.

In addition, as the material of the dust filter 44, a sponge is mainly used to conform to the above-described action, and the material of the filter cover 45 is PVC (Poly Vinyl Chloride) having a certain degree of elasticity to facilitate detachment. ) Is used to form a plate to facilitate repair or cleaning during use.

Referring to the operation described on the basis of the structure described in FIG. 3, when the LCD projector is in operation, outside air blown in from the lower portion of the synthesis unit 12 is freely provided through the dust filter 44 and the filter cover 45. When it is discharged to the outside and the LCD projector stops operating, dust falling freely is caught by the dust filter 44, and dust outside the blocking range of the dust filter 44 is removed from the filter cover 45. By filtering, there is almost no dust reaching the LCD panel, so the screen on the screen shows little dust, and the screen on the screen is of high quality.

In addition, in the structure as shown in FIG. 3, the LCD connector 43 is inserted into the LCD connector insertion groove 44a which is processed in the dust filter 44, thereby causing the LCD connector 43 to malfunction due to excessive bending. It is preventing.

On the other hand, in the present invention to explain in more detail the reason that the structure of the filter has a double layer structure, if the filter cover 45 covers the synthesis system (see 12 in Figure 2) as a whole without a hole free from the outside The falling dust is effectively blocked, but instead, the passage through which the outside air blown in through the intake fan (see 31 in FIG. 1) is allowed to cool off the synthesis unit 12 is blocked so that the outside air is again synthesized unit 12. By returning to the inside, the synthetic part 12 cannot be sufficiently cooled, and the synthetic part 12 which is not sufficiently cooled is heated above the heat limit, so that the LCD boiling or the polarizing plate as described above There is a burning phenomenon.

Figure 4 is a view showing a dust inflow prevention device according to the invention installed in the LCD.

Referring to FIG. 4, there is provided a synthesis section 12 including the LCD panel (see 47 in FIG. 3) for making an image and a prism (see 46 in FIG. 3) for refracting or combining light. The filter is inserted in such a manner as to cover (12) from above, which will be described in more detail. The dust filter 44 covers the upper part, and the filter cover 45 is installed to fix or protect the upper part of the present invention. The entire composition of is completed.

In the structure of the present invention, the method of installing the filter cover 45 will be described with reference to the enlarged portion of the filter support rib 40 portion A of FIG. 4. The filter cover 45 is elastically sandwiched between the upper protrusion 41 and the lower protrusion 42 formed on the filter support rib 40 by using elasticity. More specifically, one side of the filter support rib 40 is provided. After inserting one side of the filter cover 45 between the upper protrusion 41 and the lower protrusion 42 provided at the other side, it is installed in such a manner that the other side is pressed and inserted so that the filter cover 45 is fixed so as not to move. .

As described above, the dust filter 44 and the filter cover 45 are installed to protect the prism or the LCD panel from foreign substances such as external dust, thereby obtaining a better screen on the screen.

As described above, the apparatus for preventing dust inflow of an LCD projector according to the present invention effectively blocks foreign substances such as dust flowing into the projector while the LCD projector is stopped so that dust or the like does not form on the LCD panel or prism. Unlike this, the image quality on the screen can be further improved.

Claims (5)

The dust prevention device of the LCD projector, characterized in that the filter is installed on the upper side of the synthesis unit in order to block the inflow of dust and the like to the composite panel of the LCD panel for forming the image and the LCD projector for refracting or combining the light. The method of claim 1, And said filter comprises a dust filter for filtering dust, and a filter cover provided on an upper surface of said dust filter to protect the dust filter and open the air freely. The method of claim 2, The dust filter is dust intrusion prevention device of the LCD projector, characterized in that provided with a porous flexible sponge in order to effectively filter the dust. The method of claim 2, The dust inflow of the LCD projector is provided on the left and right sides of the filter cover and has a filter support rib formed on the upper side of the filter cover ribs so that the upper and lower protrusions are formed on the upper part of the filter cover. Prevention device. The method of claim 4, wherein And the filter cover is made of plastic so that the material is easily fitted to the upper protrusion and the lower protrusion.