KR20080085580A

KR20080085580A - Dmd panel clinching apparatus

Info

Publication number: KR20080085580A
Application number: KR1020070027314A
Authority: KR
Inventors: 박원우
Original assignee: 엘지전자 주식회사
Priority date: 2007-03-20
Filing date: 2007-03-20
Publication date: 2008-09-24

Abstract

A device for fixing a DMD(Digital Micromirror Device) panel is provided to improve picture quality of a projection optical device by uniformly pressing the DMD panel and a drive board. A device for fixing a DMD panel(13) comprises a panel holder(15), a radiating contact unit(21), a cutoff plate(19), a panel clamp(11), a uniform pressing plate(25), and an elastic piece(23). The panel holder is located between a drive board(17) and the DMD panel to electrically connect the DMD panel to the drive board. The radiating contact unit is in contact with the DMD panel via a through hole(15a) of the drive board and the panel holder at one side thereof, and has a radiating fin(27) at the other side thereof. The cutoff plate, through which the radiating contact unit penetrates, is formed on the drive board. The panel clamp is coupled to the cutoff plate to fix the drive board, the panel holder, and the DMD panel. The uniform pressing plate is protruded from the radiating contact unit to uniformly press the cutoff plate. The elastic piece is fixed to the cutoff plate and presses the uniform pressing plate to contact the radiating contact unit with the DMD panel.

Description

DMD PANEL CLINCHING APPARATUS

1 shows a DMD assembly generally having a DMD cooling device of an optical projection device.

2 is a view showing a state of the heat dissipation fin 5 in contact with the conventional DM panel.

Figure 3 shows a schematic diagram according to an embodiment of the DMD panel fixing device according to the present invention.

4 is a plan view showing an embodiment of the panel holder 15.

5 is a perspective view exemplarily illustrating a state in which a uniform pressure plate is formed on the heat dissipation contact part 21.

6 shows that the DMDM panel 13, the panel holder 15, and the driving substrate 17 are connected to the panel clamp 11 and the blocking plate 19, and the heat dissipation contact portion 21 is formed by the elastic piece 23. It shows a fixed state.

7 illustrates a vertical bar phenomenon.

11: panel clamp 13: DM panel

15: panel holder 17: driving substrate

19: blocking plate 21: heat dissipation contact

23: elastic piece 25: uniform pressure plate

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for fixing a DM panel of a projection optical device, and more particularly, to a projection optical device having a mounting of a DM panel for uniformly coupling a driving substrate and a DM panel.

Recently, as the demand for the projector as a projection optical device for home theaters and presentations increases, the miniaturization, low noise, and high image quality of these devices are increasing. According to this trend, the devices are miniaturized and highly integrated, and thus, the amount of heat generated per unit area is rapidly increased, and thus, there is a need for a compact cooling device with superior cooling efficiency than a conventional cooling device. The image generating unit employed in the projection optical device adopts a method such as a liquid crystal display (LCD), a liquid crystal on silicon (LCos), and a digital micromirror device (DMD), and receives image information. Raises the image. Recently, a projection optical device employing a DMD assembly having a higher light utilization efficiency than other methods has been developed and spread.

As shown in FIG. 1, in general, the DM cooling apparatus of the optical projection apparatus is installed in the driving substrate 1 constituting the DM.

The DMDM is positioned between the driving substrate 1, the DM panel 2 receiving the movable signal through the driving substrate 1, and the driving substrate 1 and the DM panel 2. The panel holder 3 is coupled to the panel 2 to electrically connect the driving substrate 1 and the DMD panel 2, and the panel fixed to the driving substrate 1 while covering the panel holder 3 to the outside. It consists of the clamp 4.

A plurality of electrodes are formed on the driving substrate 1 to transmit an operation signal of the DMDM panel 2, and a plurality of terminal pieces corresponding to the electrodes are formed on the panel holder 3. The DM panel 2 coupled to (3) is electrically connected to the terminal piece so that the DM panel 2 can receive a movable signal from the driving substrate 1.

In the DMDM configured as described above, a separate cooling device is installed in the driving substrate 1 in order to prevent thermal damage of the DMDM panel 2 due to high heat generated during the operation.

The cooling device includes a heat dissipation fin 5 that is in contact with the DM panel 2 to dissipate heat from the DM panel 2 to the outside to dissipate heat to the outside. To this end, through-holes 1a and 3a communicating with the DM panel 2 are formed in the driving substrate 1 and the panel holder 3.

As shown in FIG. 2, the heat dissipation fins 5 protrude from the heat dissipation fins 5 toward the movable substrate 1 so as to be in contact with the DM panel 2 through the through holes 1a and 3a. do. The heat dissipation fin 10 is fixed to the driving substrate 1 in contact with the DM panel 2 through the through holes 1a and 3a.

However, in the cooling device having the above configuration, since the heat dissipation fins 5 are directly in contact with the driving substrate 1, the heat of the DM panel 2 is not radiated to the outside through the heat dissipation fins 5, and a part of the cooling substrates is partially driven. The problem of falling into (1) occurs. As such, when the heat of the DM panel 2 is conducted to the driving substrate 1 side, smooth heat dissipation is not performed through the heat dissipation fins 5, thereby lowering the cooling efficiency of the DM DM, and of course, the driving substrate 1. Various devices and circuits attached thereto are not normally operated, which leads to serious problems that cause serious problems in the performance and operation of the DMDM.

The technical problem to be achieved by the present invention is to solve the above problems, the heat of the DM panel is minimally conducted to the driving substrate side by applying evenly distributed loads to the DM panel and the driving substrate to be uniformly coupled To improve the performance of the projection optical device.

In order to achieve the above object, a DM panel fixing device according to the present invention is formed between the drive substrate and the DM panel panel holder for electrically connecting the DM panel to the drive substrate, the drive substrate and One side is in contact with the DM panel through the through hole of the panel holder and the other side is a heat dissipation contact portion having a heat radiation fin, a heat dissipation contact portion penetrates and formed on the driving substrate, the blocking plate is connected to the driving substrate And a panel clamp for fixing the panel holder and the DMDM panel, a uniform pressure plate protruding from the heat dissipation contact portion to uniformly press the blocking plate, and fixed to the blocking plate so that the heat dissipation contact portion and the DMDM panel are in contact with each other. Characterized in that it comprises an elastic piece for pressing the pressure plate uniformly.

The uniform pressure plate is preferably at least one trench is formed on the surface in contact with the blocking plate or in line contact with the blocking plate.

Hereinafter, the configuration and operation of the present invention will be described in detail through an embodiment of a DMD panel fixing apparatus according to the present invention.

As shown in FIG. 3, the present invention, the DMDM panel fixing device includes a panel clamp 11, a DMD panel 13, a panel holder 15, a heat dissipation contact part 21, a light shield plate 19, The drive substrate 17 and the elastic piece 23 are comprised.

The driving substrate 17 connects the driving unit (not shown) and the DM panel 13 to allow the driving unit to manipulate the DM panel to display an image.

The panel holder 15 is formed between the driving substrate 17 and the DM panel 13 to electrically connect the DM panel 13 to the driving substrate 17. 4 is a plan view showing an embodiment of the panel holder 15. As shown in the drawing, a penetrating portion 15a is formed in the center so that the heat dissipation contact portion 21 can be penetrated, and the driving substrate 17 is surrounded therein. ) And a plurality of C-springs (C-spring) are formed so that the DM panel 13 can be electrically connected.

The heat dissipation contact part 21 is in contact with one side of the DM panel 13 through the through holes 15a and 17a of the driving substrate 17 and the panel holder 15, and a heat dissipation fin 27 is formed at the other side. do. As shown in FIG. 3, the heat dissipation fin may be separately formed on a heat dissipation contact part 21 by a screw 24, but may be integrally formed on the heat dissipation contact part 21.

The blocking plate 19 has a through hole 19a formed in a central portion thereof, through which the heat dissipation contact part 21 penetrates, and is formed on the driving substrate 17. The panel clamp 11 is connected to the blocking plate 19 to fix the DM panel 13, the panel holder 15, and the driving substrate 17. That is, the panel clamp 11 and the blocking plate 19 are connected with the DM panel 13, the panel holder 15, and the driving substrate 17 therebetween.

The heat dissipation contact portion 21 has a uniform pressure plate 25 for uniformly pressing the blocking plate 19 is formed. The pressure plate 25 is preferably in line contact with the blocking plate (19). Here, the line contact means that the blocking plate 19 is in contact with a portion having a relatively small area compared to the total area of the uniform pressure plate 25. 5 is a perspective view exemplarily illustrating a state in which a uniform pressure plate is formed on the heat dissipation contact part 21. A trench 25a is formed in the uniform pressure plate 25 to make a line contact with the blocking plate 19, or as shown in FIG. 5B. Pins 25b are formed to make line contact. .

The elastic piece 23 is fixed on the blocking plate 19 to press the uniform pressure plate 25 so that the heat dissipation contact portion and the DM panel contact. When the uniform pressure plate is pressed, the blocking plate 19 which is in contact with the heat dissipation contact portion 21 integrally formed is also pressed together. In this embodiment, as shown in FIG. 3, the elastic piece 23, the blocking plate 19, the panel holder 15, and the DMDM panel 13 are sequentially penetrated through the four screws 22. It is fixed to the panel clamp 11.

FIG. 6 shows that the DMD panel 13, the panel holder 15, and the driving substrate 17 are connected to the panel clamp 11 and the blocking plate 19, and the heat dissipation contact portion 21 is the elastic piece 23. It shows the fixed state by). An additional configuration such as a connector 30 may be further formed on the driving substrate.

FIG. 6A is a perspective view of the assembly, and FIG. 6B is a cross-sectional view illustrating a cross section taken along the center of the assembly. However, in (b), the elastic piece 23 is omitted in order to simplify the drawing. As shown in FIG. 6, the elastic piece 23 is fixed to the upper portion of the blocking plate 19 by a screw 22, and presses the uniform pressure plate 25 protruding from the heat dissipation contact portion 21. When the uniform pressure plate 25 is pressed, the heat dissipation contact portion 21 connected thereto is in contact with the DMDM panel through the through hole.

In this case, the DMD panel 13, the panel holder 15, and the driving substrate 17 are fixed by the panel clamp 11 and the blocking plate 19, but the blocking plate 19 is far from the portion that is connected with the screw. Increasingly, the force to pressurize the driving substrate becomes weaker. If the blocking plate 19 does not pressurize the driving substrate 17 uniformly, the driving substrate and the DMDM panel may not be uniformly contacted. As such, when the driving substrate 17 and the DM panel 13 do not make uniform contact, a vertical bar phenomenon as shown in FIG. 7 may occur during display. Since the vertical bar phenomenon may cause deterioration of image quality, the uniform pressure plate 25 is formed to allow the blocking plate 19 to uniformly press the driving substrate 17. However, if the contact area between the uniform pressure plate 25 and the blocking plate 19 is large, heat conducted to the heat dissipation contact portion 21 may be conducted to the driving substrate 17, thereby causing a burden on the driving unit. Therefore, in the DMD fixing device according to the present invention, the uniform pressure plate 25 and the blocking plate 19 are in line contact with each other as shown in part C of FIG. 6 (b), and the heat conducted to the heat dissipation contact part 21 is again driven. Minimize the conduction to 17).

The operation of the DMD panel fixing device of the present invention will be described below.

As the blocking unit 19 and the panel clamp 11 are connected, the DM panel 13 is connected to the driving substrate 17 through the panel holder 15, and the DM panel 13 is externally connected in accordance with the operation signal of the driving unit. The light source incident from the image is realized through selective reflection. At this time, heat is generated in the panel by many micromirrors provided in the DM panel 13 at a high speed. If the panel is heated above a certain level, the function of the panel and the driving circuit may be impaired, so heat generated in the panel is conducted to the heat dissipation contact part 21 and radiated through the heat dissipation fins 27. At this time, the elastic piece 23 presses the uniform pressure unit 25 and the heat dissipation contact unit 21 connected to the uniform pressure unit elastically contacts the DM panel 13. In addition, the pressurized uniform pressurizing portion 25 pressurizes the blocking plate 19 uniformly so that the DMDM panel and the driving substrate can be uniformly contacted.

Duplicate description will be omitted for the same parts as in the prior art.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

As described above, the DMDM panel fixing device according to the present invention effectively radiates heat generated from the DMDM panel, and applies an evenly distributed load to the DMDM panel and the driving substrate so as to use the DMDM panel. Provides the effect of improving the picture quality.

Claims

In the DM panel fixing device for connecting the DM panel to the driving substrate,

A panel holder formed between the driving substrate and the DM panel to electrically connect the DM panel to the driving substrate;

A heat dissipation contact portion in which one side of the DM panel contacts the through hole of the driving substrate and the panel holder, and a heat dissipation fin is formed at the other side;

A blocking plate penetrating the heat dissipation contact portion and formed on the driving substrate;

A panel clamp connected to the blocking plate to fix the driving substrate, the panel holder and the DM panel;

A uniform pressure plate protruding from the heat dissipation contact unit to uniformly press the blocking plate; And

And a resilient piece that is fixed on the blocking plate and pressurizes the uniform pressure plate so that the heat dissipation contact part and the DM panel come into contact with each other.

The method of claim 1,

The uniform pressure plate is fixed device of the DM panel, characterized in that at least one trench is formed on the surface in contact with the blocking plate.

The method of claim 2,

The uniform pressure plate is fixed to the DM panel, characterized in that the line in contact with the blocking plate.