JP2001005398A - Dust-removing device for lcd panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove the dust sticking to an LCD panel of a liquid crystal projector, without having to open the cover of a casing. SOLUTION: When dust adheres to an LCD panel 2, the shadow of the dust appears in a projected video. A user rotates a shaft 12 by manipulating a knob 11 to turn a handle 10. A shaft 14 is rotated via a worm gear 13, and a gear 17 intermeshed therewith and a holder is moved like an arrow a by screwing of thread ridges 16 and thread grooves at the inner wall of a hole 15 of the holder 8, and therefore, the front end 7 of an air pipe 6 is moved near the dust of the LCD. The position of the front end 7 is indexed from the rotating direction, and number of revolutions of the shaft 14 by a position sensor 18 is subjected to video processing and is displayed by marks on a screen. A nozzle 4 of an air spray 3 is inserted into a nozzle port 5, and if air is injected, the air blows out of the front end of the air pipe and blows off the dust of the LCD panel. The dust is adsorbed to a dust absorber 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an LCD (Liquid Crys).
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust removal device for a tal display panel, which blows air onto an LCD panel to remove dust that is obstructive to an image attached to the LCD panel.

[0002]

2. Description of the Related Art In a liquid crystal projector, a cooling fan is constantly operated to cool an LCD panel. Normal,
The cooling fan is of a type that draws in outside air and blows air into the housing. However, a filter is attached to the air inlet to prevent dust from entering the housing. However, if a fine-grained filter is used, the air intake performance deteriorates, so a slightly coarse-grained filter is often used. It may be disturbing. To remove the dust attached to the LCD panel, the cover must be removed, and the dust may be re-attached during the removal of the dust due to the removal of the cover. For example, there is a problem that it is difficult to remove dust.

[0003]

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to remove dust adhering to an LCD panel without removing a cover.

[0004]

In order to achieve the above object, a dust removing apparatus for an LCD panel according to the present invention comprises an LCD panel.
In a device for enlarging and projecting light modulated by a panel onto a screen, a nozzle opening for inserting a tip of an air spray nozzle is provided on an upper surface of a housing for storing an LCD panel or the like, and a base end is provided with the nozzle. Connected to the mouth and the tip
An air pipe arranged above the CD panel, and the air jetted from the air spray is supplied through the air pipe to the air pipe.
It is configured to spray dust on the CD panel and remove dust attached to the LCD panel.

A dust adsorber is provided below the LCD panel to adsorb dust blown off by air from an air spray. In addition, you may make it use an electrostatic sheet for adsorbing electrostatically charged dust as a dust adsorption body.

In addition, the air pipe is formed of a flexible member, and is provided above the LCD panel and holds a tip of the air pipe, and a worm gear is provided on an upper surface of the housing and has a worm gear attached to the tip. A handle for rotating the first shaft and a gear meshing with the worm gear are mounted, and a screw thread that penetrates a hole formed in the holder and meshes with a screw groove formed in the hole wall is provided. The second shaft is rotated based on the rotation of the first shaft by the operation of the handle, and the holding tool is connected to the LCD panel by screwing the screw thread of the second shaft with the screw groove of the holding tool. Move the tip of the air pipe to an appropriate position, spray air from the air spray, and remove dust adhering to the LCD panel. It may be.

Further, a dust shutoff valve formed of an elastic member and having one end fixed to the housing is provided inside the nozzle opening, curved by air spray by air spray, air is passed through an air pipe, and air is not sprayed. To close the nozzle opening to prevent dust from entering. The dust shutoff valve may be made of synthetic rubber having elasticity, or an urging spring may be attached to the lower surface of the dust shutoff valve so that no gap is formed in the nozzle port when air is not injected.

Alternatively, the nozzle opening is formed by an elastic member, opened by inserting the nozzle, passing air from an air spray through an air pipe, and closing by removing the nozzle to prevent dust from entering. Is also good. The nozzle port may be made of synthetic rubber having elasticity.

A dust filter is provided inside the nozzle port to prevent dust from entering through the nozzle port.

A position sensor for detecting the position of the tip of the air pipe based on the rotation direction and the number of rotations of the second shaft is provided, and a display signal generation unit is provided to display an air blowing position based on a signal from the position sensor. A signal from the display signal generator is generated by a built-in signal processing circuit for driving the LCD panel for light modulation, and the modulated signal from the LCD panel is displayed at a corresponding position on the projection screen. Good.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. FIG. 1 shows an LCD according to the present invention.
FIG. 2 is a main part configuration diagram (partial side view of a liquid crystal projector device) of an embodiment of a panel dust removing device. In the figure, 1
Is a housing of a liquid crystal projector, 2 is an LCD panel, 3 is an air spray for injecting compressed air, 4 is a nozzle of the air spray 3, 5 is a nozzle port for inserting the tip of the nozzle 4, and 6 is a nozzle. An air pipe connected to the port 5 and formed of a member having flexibility for passing air, 7 is a tip (air outlet) of the air pipe 6, 8 is a holder for holding the tip 7, and 9 is a lower part of the LCD panel 2. For example, an electrostatic sheet for adsorbing electrostatically charged dust, 10 is a handle which is rotated by operating a knob 11, and 12 is a dust adsorber which is connected to the handle 10 and rotates as shown by an arrow A. 1 shaft, 13 is a worm gear attached to the tip of the first shaft 12, 14 is provided with a screw thread 16 which penetrates a hole 15 formed in the holder 8 and meshes with a thread groove formed in the wall of the hole 15. The second
A shaft that rotates based on the rotation of the first shaft 12 by operating the handle 10 and moves the holder 8 in parallel with the surface of the LCD panel 2 by screwing the thread 16 with the screw groove of the holder 8; A gear 17 is fixed to the second shaft 14 and meshes with the worm gear 13. A position sensor 18 detects the position of the tip 7 of the air pipe 6 based on the rotation direction and the number of rotations of the second shaft 14.

Next, the operation of the apparatus for removing dust from an LCD panel according to the present invention will be described. When dust adheres to the LCD panel 2, a dust shadow 21 appears on the projected image on the screen as shown in FIG. A position sensor 18 is attached to the second shaft 14, detects the rotation direction and the number of rotations of the second shaft 14, and detects the position of the tip 7 of the air pipe 6 based on the detection data. This signal is input to a display signal generation unit (not shown) to generate a signal indicating an air blowing position, and is input to a built-in signal processing circuit for driving the LCD panel 2 for light modulation, and synthesized. Then, a mark 22 (see FIG. 2) indicating the air blowing position is displayed on the screen.

Then, the handle 10 is turned by operating the knob 11. The rotation of the handle 10 causes the first shaft 12 to rotate as shown by the arrow A, and the second shaft 14 to rotate via the worm gear 13 and the gear 17 meshing therewith.
Due to the screwing of the holding tool 8 and the thread groove of the holding tool 8, the holding tool 8 moves in the direction of arrow a while holding the tip 7 of the air pipe 6.
The handle 10 is moved so that the position of the mark 22 on the screen (the tip 7, that is, the air outlet) matches the position of the dust 21. If the nozzle 4 of the air spray 3 is inserted into the nozzle port 5 and the air is jetted, the air is supplied to the nozzle port 5.
From the tip 7 through the air pipe 6
Dust adhering to the D panel 2 is blown off. The blown-off dust is adsorbed by a dust absorber (such as an electrostatic sheet) 9.

FIGS. 3 and 4 are detailed views showing examples of the nozzle port 5. FIG. In the example of FIG. 3, a dust shutoff valve 31 is provided inside the nozzle port 5. The dust shutoff valve 31 is formed of an elastic member, for example, synthetic rubber, and has one end (the right end in the figure) fixed to the housing 1. The dust shut-off valve 31 normally closes the nozzle port 5 as shown in (a) of the drawing to prevent dust from entering the housing from the nozzle port 5, but as shown in (b) of FIG.
Is bent by wind pressure when air is ejected and the nozzle opening 5 is opened, and the air is sent to the air pipe 6. Note that 32
Is a biasing spring, which prevents the dust shutoff valve 31 from curving downward by its own weight when air is not jetted, thereby preventing a gap from being formed in the nozzle port 5. Reference numeral 33 denotes a dust cutoff filter which prevents dust from entering the housing 1 when dust is blown together with air. In the example of FIG. 4, the nozzle port 5 is formed of a member having elasticity, for example, synthetic rubber, and when the nozzle 4 is not inserted, the tips are fitted together as shown in FIG. So that no nozzle 4 is inserted
To open as shown in (b) so that the air from the nozzle 4 is sent into the air pipe 6.

When three LCD panels 2 for red, green and blue are used, the handle 10, the first and second shafts 1
2, 14 and three sets of holders 8 are provided for red, green and blue, and the air pipe 6 is divided into three branches in the middle or the nozzle port 5
In addition, three sets of air pipes 6 are provided so that dust on the LCD panel of each color can be removed.

[0016]

As described above, according to the present invention, L
According to the dust removing device for a CD panel, when dust adheres to the LCD panel and a shadow appears in a projected image, the dust on the LCD panel can be removed without opening the housing cover using an air spray. Since the dust blown off by air is adsorbed by the dust adsorber and does not adhere to the LCD panel again, open the cover and carry out the dust removal work while taking care not to attach new dust to the LCD panel. This eliminates the need for such troublesome work.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a main part of an embodiment of an apparatus for removing dust from an LCD panel according to the present invention.

FIG. 2 is an example of a display of an air blowing position.

FIG. 3 is a sectional view of a main part of an example of a nozzle port 5;

FIG. 4 is a sectional view of a main part of another example of the nozzle port 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 LCD panel 3 Air spray 4 Nozzle 5 Nozzle port 6 Air pipe 7 End of air pipe 6 8 Holder 9 Dust adsorbent (electrostatic sheet) 10 Handle 11 Knob 12 First shaft 13 Worm gear 14 Second shaft 15 Hole 16 Screw Mountain 17 Gear 18 Position sensor 21 Dust shadow 22 Mark indicating blow-out position 31 Dust shutoff valve 32 Energizing spring 33 Dust shutoff filter

Claims (11)

[Claims] 1. An apparatus for enlarging and projecting light modulated by an LCD (Liquid Crystal Display) panel onto a screen, wherein the light is provided on an upper surface of a housing for storing the LCD panel and the like, and a tip of an air spray nozzle is inserted thereinto. And a base end connected to the nozzle opening, and a tip end connected to the LC
An air pipe disposed above the D panel, wherein the air sprayed from the air spray is blown onto the LCD panel through the air pipe to remove dust adhering to the LCD panel. apparatus. 2. A dust removing device for an LCD panel according to claim 1, wherein a dust adsorbing body is provided below said LCD panel to adsorb dust blown off by air from an air spray. 3. The dust removing device for an LCD panel according to claim 2, wherein the dust adsorbing member uses an electrostatic sheet for adsorbing electrostatically charged dust. 4. The air pipe is formed of a flexible member, and is disposed above the LCD panel.
A holder for holding a distal end of the air pipe, a handle provided on the upper surface of the housing for rotating a first shaft having a worm gear attached to the distal end thereof, and a gear meshing with the worm gear are attached, and the holding is performed. A second shaft provided with a thread which penetrates a hole formed in the tool and meshes with a thread groove formed in the hole wall, and wherein the second shaft is rotated based on rotation of the first shaft by operating the handle. Is rotated so that the holding tool is moved in parallel with the LCD panel surface by screwing the screw thread of the second shaft and the screw groove of the holding tool, and the tip of the air pipe is moved to an appropriate position, Spray air from spray, LC
4. The dust removing device for an LCD panel according to claim 1, wherein dust attached to the D panel is removed. 5. A dust shutoff valve formed of an elastic member and having one end fixed to a housing is provided inside the nozzle opening,
5. The dust of an LCD panel according to claim 1, wherein the nozzle is bent by air injection by air spray, air is passed through an air pipe, and the nozzle opening is closed by non-air injection to prevent dust from entering. Removal device. 6. The apparatus for removing dust from an LCD panel according to claim 5, wherein the dust shutoff valve is formed of an elastic synthetic rubber. 7. The dust removing device for an LCD panel according to claim 5, wherein a biasing spring is attached to a lower surface of the dust shutoff valve so that no gap is formed in a nozzle opening when air is not injected. 8. The nozzle opening is formed of a member having elasticity, opened by inserting the nozzle, passing air from an air spray through the air pipe, closing by removing the nozzle, and preventing entry of dust. 5. The dust removing device for an LCD panel according to claim 1, 2, 3, or 4. 9. The apparatus for removing dust from an LCD panel according to claim 8, wherein said nozzle opening is formed of synthetic rubber having elasticity. 10. The dust removing device for an LCD panel according to claim 1, wherein a dust blocking filter is provided inside the nozzle opening to prevent dust from entering through the nozzle opening. 11. A position sensor for detecting a position of a tip of the air pipe based on a rotation direction and a number of rotations of the second shaft, and a display signal generation unit is provided, and an air blowing position based on a signal from the position sensor. And a signal from a display signal generation unit is synthesized by a built-in signal processing circuit for driving the LCD panel for light modulation.
The L according to any one of claims 1 to 10, wherein the light is displayed at a corresponding position on the projection screen by modulated light from an LCD panel.
Dust removal device for CD panel.