KR200313014Y1 - Digital micro mirror device - Google Patents

Abstract

The present invention provides a panel substrate having a driving substrate of an image display device, a micromirror panel that operates according to a driving signal from the driving substrate, and a micro clamp panel positioned on the driving substrate and having an opening corresponding to the reflective surface of the micromirror panel. A digital micromirror device comprising: a ground pattern provided on a driving substrate; And a ground bracket interposed between the micromirror panel and the panel clamp, and one end of which is connected to a ground pattern of the driving substrate. According to this, the micromirror panel can be easily grounded, and the leakage of electromagnetic waves toward the front of the micromirror panel can be blocked as much as possible.

Description

DIGITAL MICRO MIRROR DEVICE}

The present invention relates to a digital micromirror device (DMD), and in particular, a digital micromirror capable of minimizing the inevitable electromagnetic wave and leakage thereof between an electrically connected digital micromirror panel and a driving substrate. Relates to a device.

As the problem of electromagnetic interference, which is largely classified into EMI (Electro Magnetic Interference) and EMS (Eletro Magnetic Susceptibility), has recently emerged, efforts are being made to improve this across electronic products. As a part of this, even in the image display apparatus, individual improvement structures of respective unit units are being applied. Particularly, among the circuit boards in which electromagnetic waves are relatively generated, shielding with a separate shielding member is also disclosed.

However, in the digital micromirror device of the image display device, there is a problem in that electromagnetic leakage cannot be completely shielded due to its structural characteristics, that is, the configuration of reflecting the beam incident from the outside after digital modulation. Detailed description thereof will be described with reference to FIGS. 1 and 2.

FIG. 1 is a diagram schematically showing a main configuration of an image display apparatus having a digital micromirror device. In the image display apparatus 1, as can be seen from the figure, a beam emitted from the light source 3 is incident on the color wheel 5 through the first condenser 4. The color wheel 5 separates the incident beam into R (Red), G (Green), and B (Blue) components, and the components separated in this way are sequentially passed through the second condenser 6 to form a digital micromirror device ( 10) is illuminated.

The digital micromirror device 10 has a micromirror panel 31, as can be seen in FIG. 2. The micromirror panel 31 digitally modulates the monochromatic light, which is separated from the color wheel 5 and is incident on the basis of the digital image signal input from a signal processor (not shown), and then reflects the light toward the projection lens 7. The projection lens 7 enlarges the beam from the micromirror panel 31 and projects it toward the screen 8, whereby it is implemented as an image on the screen 8.

2 is an exploded perspective view of a conventional digital micromirror device incorporated in such an image display apparatus. The conventional digital micromirror device 10 includes a driving substrate 11, a micromirror panel 31 receiving a movable signal through the driving substrate 11, and a micromirror panel 31. It is composed of a fixing unit (20) for coupling and fixing to). The driving substrate 11 is provided with a plurality of electrodes 12 for applying a movable signal of the micromirror panel 31.

The fixing unit 20 includes a panel clamp 15 facing the panel holder 15 with the panel holder 15 interposed between the driving substrate 11 and the micromirror panel 31 and the micromirror panel 31 interposed therebetween ( 21 and a jig 41 which is integrally fixed to the panel holder 15 and the panel clamp 21 with the driving substrate 11 therebetween. The panel holder 15 is provided with a plurality of terminal pieces 16 for electrically connecting the mirror array portion 35 of the micromirror panel 31 and the driving substrate 11. The panel clamp 21 is formed with an opening 22 exposing the mirror array portion 35 of the micromirror panel 31.

By this configuration, the micromirror panel 31 applies a digital video signal from the driving substrate 11 through the terminal piece 16 of the panel holder 15. Then, based on the applied image signal, each monochromatic light separated and incident by the color wheel 5 is synchronously digitally modulated and then reflected toward the projection lens 7.

However, in the conventional digital micromirror device 10, the micromirror panel 31 and the driving substrate 11 are connected to each other via a plurality of terminal pieces 16 due to the characteristics of the plurality of electrical connection configurations. As a result, relatively high levels of electromagnetic waves are generated. And, in particular, because its own grounding structure is weak, there is a problem that EMI occurs through the opening of the panel clamp.

Accordingly, it is an object of the present invention to provide a digital micromirror device which can improve the grounding structure of a micromirror panel while blocking the leakage of electromagnetic waves as much as possible in view of such a conventional problem.

1 is a view schematically showing a configuration of an image display apparatus having a digital micromirror device;

2 is an exploded perspective view of a conventional digital micromirror device,

3 is an exploded perspective view of a digital micromirror device according to the present invention;

4 is an assembled perspective view of FIG. 3;

5 is a cross-sectional view of FIG. 4, and

6 is an enlarged perspective view of the ground bracket of FIG. 4.

<Description of Major Symbols in Drawing>

1: Image display device 5: Color wheel

10: conventional digital micromirror device

11: driving substrate 15: fixed holder

21: panel clamp 23: coupling groove

31 micromirror panel 35 mirror array

41: jig

50: Digital micromirror device of the present invention

51: grounding pattern 61: grounding bracket

62: bracket body 64: terminal portion

66: fixed flange portion 71, 75: gasket

The object is, according to the present invention, a driving substrate of an image display apparatus, a micromirror panel that is operated in accordance with a driving signal from the driving substrate, and the micromirror panel is positioned on the driving substrate and the half of the micromirror panel is fixed. A digital micromirror device having a panel clamp having an opening corresponding to a slope, comprising: a ground pattern provided on the driving substrate; And a ground bracket interposed between the micromirror panel and the panel clamp, the ground bracket being connected to a ground pattern of the driving substrate.

Here, the ground bracket may include a belt-shaped bracket body interposed along a longitudinal contact edge between the micromirror panel and the panel clamp; A terminal portion bent and connected toward the ground pattern along an outer longitudinal edge of the bracket body; And a fixed flange portion bent to contact the inner surface of the opening of the panel clamp along the inner longitudinal edge of the bracket body.

Then, since the bracket body of the ground bracket shields a gap formed between the micromirror panel and the panel clamp, it can block the electromagnetic waves flowing out.

The digital micromirror device further includes a gap formed between the fixed flange portion of the ground bracket and the opening of the panel clamp, and between the fixed flange portion of the ground bracket and the mirror array portion protruding from the front center portion of the micromirror panel. It is preferable to further include a conductive gasket interposed on at least one side.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment according to the present invention. In this case, the same reference numerals are assigned to the same configurations and names as those of FIGS. 1 and 2 described above with reference to the related art.

3 is an exploded perspective view of a digital micromirror device according to the present invention, FIG. 4 is an assembled perspective view of FIG. 3, and FIG. 5 is a sectional view of FIG. 4. The digital micromirror device 50 couples the driving substrate 11, the micromirror panel 31 received with the movable signal through the driving substrate 11, and the micromirror panel 31 to the driving substrate 11. Having a fixing unit 20 for fixing is the same as in the prior art. Here, the fixing unit 20 also has a similar configuration including the fixing holder 15, the panel clamp 21, and the jig 41.

However, the digital micromirror device 50 includes a grounding pattern 51 formed on the driving substrate 11, a grounding bracket interposed between the micromirror panel 31 and the panel clamp 21 of the fixing unit 20. (61) and a conductive gasket (71) sandwiched between the ground bracket (61) and the micromirror panel (31).

The driving substrate 11 is formed with a through hole 13 accessible to the rear surface of the micromirror panel 31 to the rear. The through hole 13 serves to cool the heat by providing ventilation to the micromirror panel 31 disposed in front. The electrode 12 is provided around the passage hole 13, and a ground pattern 51 made of a copper foil surface surrounding the electrode 12 is attached. The ground pattern 51 is connected to the ground bracket 61 to be described later in detail, and serves to ground the micromirror panel 31.

The fixed holder 15 has a fixed rib 17 for protruding and fixing the micromirror panel 31 with its longitudinal outer surface protruding with respect to the reference plate surface. An opening 18 corresponding to the through hole 13 of the driving substrate 11 is formed in the central region of the plate surface to expose the rear surface of the micromirror panel 31. In addition, a plurality of terminal pieces 16 are provided on the plate surface between the opening 18 and the fixed rib 17. These terminal pieces 16 serve to electrically couple the driving substrate 11 and the micromirror panel 31 to each other.

The fixing holder 15 is further coupled to the panel clamp 21 by protruding engaging projections 19 at both sides of the diagonal direction. Coupling pins protruding toward the driving substrate 11 are formed on the rear surface of these coupling protrusions 19, respectively. Coupling pins are accommodated in the pin groove 14 provided to correspond to the driving substrate 11, thereby preventing the left and right flow of the fixed holder (15).

The micromirror panel 31 is comprised from the panel part 32 accommodated in the fixing holder 15, and the mirror array part 35 which protruded in the front center area | region of this panel part 32. As shown in FIG. A plurality of contacts are provided on the rear surface of the panel portion 32 to be connected to the terminal pins 16 of the fixed holder 15. In the mirror array unit 35, as described in connection with the prior art, a plurality of micromirrors are arranged to form a reflective surface.

The panel clamp 21 has an opening 22 for exposing the reflective surface of the micromirror panel 31, that is, the mirror array portion 35, to the front. In addition, both side edge regions are provided with a groove groove 23 engaged with the engaging projection 19 of the fixed holder 15. The panel clamp 21 is further provided with a bolt groove 25 at appropriate intervals along its longitudinal outer surface. The bolt groove 25 corresponds to the fastening hole 14 ′ formed in the driving substrate 11, whereby the panel clamp 21 is integral with the jig 41 disposed on the rear surface of the driving substrate 11. Can be fastened and fastened using a plurality of bolts.

On the other hand, the ground bracket 61 is bent toward the driving substrate 11 along the rectangular longitudinal bracket body 62, the outer longitudinal edge of the bracket body 62, as can be seen in more detail in FIG. It consists of an extended terminal portion 64 and a fixed flange portion 66 that is bent and extended to contact the opening portion 22 of the panel clamp 21 along the inner longitudinal edge of the bracket body 62. The ground bracket 61 is preferably made of a thin and lightweight conductive metal material.

The bracket body 62 is formed to surround the panel portion 32 of the micromirror panel 31, and is appropriately cut along the longitudinal plate surface. By forming the cutout portion 63 in this way, it is advantageous to manufacture the lightweight grounding bracket 61, and the material cost can be reduced. The bracket body 62 blocks a gap generated between the micromirror panel 31 and the panel clamp 21. As a result, electromagnetic waves generated at the connecting portion between the micromirror panel 31 and the driving substrate 11 can be prevented from leaking to the first half.

The terminal portion 64 accommodates the outer surface of the fixed holder 15 in a close state. An end portion of the terminal portion 64 is in contact with the ground pattern 51 of the driving substrate 11, whereby the micromirror panel 31 can be grounded. The terminal portion 64 also serves to prevent the flow of the ground bracket 61 integrally with the fixed flange portion 66.

The conductive gasket 71 is interposed between the mirror array portion 35 of the micromirror panel 31 and the fixed flange portion 66 of the ground bracket 61. The gasket 71 is preferably composed of an elastic material, and is composed of four pieces separately manufactured in the drawing, but may be manufactured in an annular shape. As a result, leakage of electromagnetic waves that may occur between the micromirror panel 31 and the ground bracket 61 can be prevented as much as possible. In addition, it is preferable to interpose an elastic conductive gasket 75 between the fixing flange 66 of the ground bracket 61 and the opening 22 of the panel clamp 21.

In order to assemble the present digital micromirror device 50 having such a configuration, first, the ground bracket 61 is coupled to the front surface thereof while the micromirror panel 31 is accommodated in the fixing holder 15. Here, the ground bracket 61 can be simply combined by accommodating the fixing holder 15 in the terminal portion 64 thereof. Then, in a state where the panel clamp 21 is disposed in front thereof, the coupling protrusion 19 of the fixing holder 15 is accommodated in the coupling groove 23.

Thereafter, the fixed holder 15, the ground bracket 61, and the panel clamp 21 coupled with the micromirror panel 31 interposed therebetween correspond to the front surface of the driving substrate 11. At this time, the coupling pin of the fixing holder 15 is accommodated in the pin groove 14 of the driving substrate 11 to fix the position simply. Then, the jig 41 is made to correspond to the back surface of the driving substrate 11, and then the bolt hole 42 of the jig 41 and the fastening hole 14 of the substrate 11 are formed using the bolt 43 at the rear thereof. ') Then, the bolt groove 25 of the panel clamp 21 is integrally fastened.

By the plurality of bolt couplings, the micromirror panel 31, the ground bracket 61, and the holder unit 20 are integrally fixed to the driving substrate 11. At this time, the micromirror panel 31 is connected to the ground pattern 51 through the ground bracket 61, thereby maintaining a stable ground state. Here, the bracket body 62 of the ground bracket 61 disposed between the micromirror panel 31 and the panel clamp 21 is a panel of the micromirror panel 31 corresponding to each other by the fastening force of the bolt 43. It is pressurized by the part 32 and the panel clamp 21. Accordingly, the bracket body 62 of the grounding bracket 61 can be hermetically fixed in a gap formed between the micromirror panel 31 and the panel clamp 21, and this structure prevents leakage of electromagnetic waves. Can be.

On the other hand, when the coupling of the micromirror panel 31, the ground bracket 61, and the holder unit 20 is completed, a gap may occur in the contact portion therebetween. This gap is sealed using the conductive gaskets 71 and 75 of elastic material. The gasket 71 may be interposed between the micromirror panel 31 and the ground bracket 61 and between the ground bracket 61 and the panel clamp 21. By combining the gaskets 71 and 75, The assembly of the present digital micromirror device 50 is completed.

Thereafter, the method of disassembling the digital micromirror device 50 is simple by following the reverse order described above. On the other hand, in the above-described and illustrated embodiments, the fixed flange portion 66 is formed on the ground bracket 61, and between the fixed flange portion 66, the micromirror panel 31, and the panel clamp 21. It was demonstrated that the gaskets 71 and 75 were interposed. However, the fixing flange 66 of the grounding bracket 61 can be deformed, and in such a configuration, a single gasket may be used for the mirror array 35 and the panel clamp 21 of the micromirror panel 31. By interposing simply between opening part 22, the same objective and effect mentioned above can be achieved.

As described above, according to the present invention, it is possible to ground the micromirror panel with a simple configuration using a grounding pattern and a grounding bracket, and also prevent the leakage of electromagnetic waves through the opening that visually exposes the micromirror panel. A digital micromirror device is provided.

Claims (4)

A panel clamp having a driving substrate of an image display device, a micromirror panel operated according to a driving signal from the driving substrate, and an opening corresponding to the reflective surface of the micromirror panel, the micromirror panel being fixed to the driving substrate; In the digital micromirror device comprising: A ground pattern provided on the driving substrate; And And a ground bracket interposed between the micromirror panel and the panel clamp, and one end of which is connected to a ground pattern of the driving substrate. The method of claim 1, wherein the ground bracket, A belt-shaped bracket body interposed along a longitudinal contact edge between the micromirror panel and the panel clamp; A terminal portion bent and connected toward the ground pattern along an outer longitudinal edge of the bracket body; And And a fixed flange portion bent to contact an inner surface of the opening of the panel clamp along the inner longitudinal edge of the bracket body. The method of claim 2, The bracket body of the ground bracket, the digital micromirror device, characterized in that to shield the gap formed between the micromirror panel and the panel clamp to block the electromagnetic waves flowing out. The method according to claim 1 or 2. A conductive gasket interposed between at least one of the gaps formed between the fixed flange portion of the ground bracket and the opening of the panel clamp, and between the fixed flange portion of the ground bracket and the mirror array portion protruding from the front center portion of the micromirror panel. A digital micromirror device further comprising.