KR20070074142A - Optical projection system - Google Patents

Abstract

An optical projection system is provided to smoothly radiate the heat of LED(Light Emitting Diode) modules and maintain the respective LED modules at the same temperature by making excellent contact between the LED modules and heat radiating members. An optical engine(10) has the first and second LED modules(11,12). A bracket panel(20) is combined to a rear surface of the optical engine(10) to support the optical engine(10). The first heat radiating member(31) is contacted with the first LED module(11). The second heat radiating member(32) is contacted with the second LED module(12). A heat pipe(40) is supported to the bracket panel(20). The heat pipe(40) connects the first and second heat radiating members(31,32) to have thermal balance. A heat transfer member(50) is inserted between the first or second LED modules and the first or second heat radiating members.

Description

Optical Projection System {OPTICAL PROJECTION SYSTEM}

1 is a perspective view schematically showing a general optical projection system;

2 is according to an embodiment of the present invention An exploded perspective view of the main part schematically showing the optical projection system, and

3 is a perspective view illustrating an attachment state of the heat transfer member of FIG. 2.

<Description of Symbols for Main Parts of Drawings>

10; Optical engine 11; First LED module

12; Second LED module 20; Bracket panel

30; Heat dissipation member 31; First heat dissipation member

32; A second heat dissipation member 40; Heat pipe

50; Heat transfer member 51; Position alignment groove

TECHNICAL FIELD The present invention relates to an image projection system, and more particularly, to a digital light processing (DLP) type optical projection system.

Optical projection system is to realize large screen image by using optical means, depending on the type of device that implements image, Cathode Ray Tube (CRT) projection, Liquid Crystal Display (LCD) projection, and Digital Light Processing (DLP) projection Can be divided in a way.

The DLP projection method uses a digital micro-mirror device (DMD) assembly in which hundreds of thousands of fine driving mirrors are integrated, and operates as a mechanism to enlarge and project an image signal received from the outside. Optical projection systems using such a DMD assembly have been widely used because they have higher light utilization efficiency and superior color reproducibility.

Such an optical projection system includes a plurality of LED modules emitting R, G, and B colors. These LED modules generate a lot of heat during operation. Since the heat generated in this way is a major cause of deterioration of the performance of the part, a means for controlling the heat is required. However, the DLP projection method has a space limitation for installing a device for heat dissipation due to the characteristics of a small product, so that a means for controlling heat is installed separately. Generally, a heat radiating member such as a metal member is installed to face the corresponding LED module. Here, if the temperature of each LED module is different in the heat dissipation process, color shift may occur. Therefore, it is also important to maintain the same temperature of each LED module in controlling heat. It is common to employ a heat pipe that thermally connects each heat dissipation member.

1 is a schematic representation of such a general optical projection system. As shown, a general optical projection system includes an optical engine 10 having first and second LED modules 11 and 12 for emitting light, and a rear surface of the optical engine for supporting the optical engine 10. The bracket panel 20 to be coupled, the first heat dissipation member 31 in contact with the first LED module 11, the second heat dissipation member 32 in contact with the second LED module 12, and the bracket panel 20. And a heat pipe 40 supported by and circulating heat of the first and second heat dissipation members 31 and 32.

However, the general optical projection system as described above has the following problems and needs improvement.

The surface of the LED module 11, 12 of the above structure and the heat dissipation member 30 to radiate it is usually made of a metal member. Although the LED modules 11 and 12 need to be carefully controlled to maintain the same temperature, respectively, the above structure generates minute spacing due to dimensional tolerances between the contact surfaces of the metal members. Due to such dimensional tolerances, the contact between the LED modules 11 and 12 and the heat dissipation member 30 is deteriorated, so that the heat transfer is not smooth, the temperature of each LED module 11 and 12 is changed. This causes the amount of light and brightness between the LEDs to be different, resulting in deterioration of image quality.

The present invention has been made in view of the above, by providing a good contact between the LED module and the heat dissipation member to facilitate the heat dissipation of the LED module to provide an optical projection system that can maintain each LED module at the same temperature. There is this.

An optical projection system according to the present invention for achieving the above object comprises an optical engine having at least two first and second LED modules; A bracket panel coupled to a rear surface of the optical engine to support the optical engine; A first heat dissipation member in contact with the first LED module; A second heat dissipation member in contact with the second LED module; A heat pipe supported by the bracket panel and connecting the first and second heat dissipation members in a thermal equilibrium; And a heat transfer member interposed between the first and / or second LED module and the first and / or second heat dissipation member.

According to a preferred embodiment of the present invention, the heat transfer member is made of a heat transfer sheet of rubber (Rubber) material.

In addition, the heat transfer member is characterized in that attached to the LED module through an adhesive material.

Here, the heat transfer member is substantially rectangular in shape and has one or more position alignment grooves.

The above objects and other features of the present invention will become more apparent by describing the preferred embodiments of the present invention in detail with reference to the accompanying drawings. For reference, in the following description of the present invention, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, in describing the present embodiment, the same reference numerals refer to the same parts in the structure and operation as in the prior art.

As shown in Figure 2 and 3, the optical projection system according to an embodiment of the present invention is an optical engine 10 having a LED module 11, 12, a bracket panel 20, the heat radiation material ( 30, a heat pipe 40, and a heat transfer member 50 interposed between the LED modules 11 and 12 and the heat dissipation member 30.

The optical engine 10 includes two or more LED modules 11 and 12 that emit three primary colors of light. The first LED module 11 emits green light among the three primary colors of light, and the second LED module 12 emits red and blue light, two other colors. As described above, each of the LED modules 11 and 12 generates heat during operation, causing poor image quality, and thus requires effective temperature control. In addition, the optical engine 10 is provided with a projection lens or the like, and one side is coupled to the DMD substrate mounted with various chips, including DMD, it is omitted in the drawings.

The bracket panel 20 is coupled to the rear of the optical engine 10 by a screw to support the optical engine 10. In addition, the bracket panel 20 is made of a high heat transfer material to allow the heat generated from the optical engine 10 to be easily released to the outside.

The heat dissipation member 30 includes a first heat dissipation member 31 in contact with the first LED module 11 and a second heat dissipation member 32 in contact with the second LED module 12. The heat dissipation member 30 is disposed to forcibly cool the heat generated when the LED modules 11 and 12 are driven. Therefore, heat generated in each of the LED modules 11 and 12 is transferred to the heat dissipation member 30. The heat dissipation member 30 is made of a metal member having good thermal conductivity, preferably made of aluminum. In addition, the installation grooves 31a and 32a are formed at the outside of the heat dissipation member 30 so that the heat pipe 40 is coupled thereto.

The heat pipe 40 is supported by the bracket panel 20 and coupled to the installation grooves 31a and 32a of the first and second heat dissipation members 31 and 32 to heat the heat dissipation member 30. It serves to circulate. The heat dissipation member 31 and the second heat dissipation member 32 are maintained at the same temperature by the heat pipe 40 so that the temperature of each of the LED modules 11 and 12 is maintained at isothermal temperature. . In the figure, the heat pipe 40 consisting of two lines is illustrated, but the present invention is not limited thereto and may be increased or decreased as necessary.

The heat transfer member 50, which is a main part of the present invention, is interposed between the LED modules 11 and 12 and the heat dissipation member 30. In the drawing, the heat transfer member 50 is attached to the second LED module 12, but it is also possible to attach the second LED module 12 at the same time. An adhesive material is applied to one or both surfaces of the heat transfer member 50 to be attached to the heat dissipation member 30. In addition, the heat transfer member 50 has elasticity to efficiently mediate heat between the LED module 11 and 12 and the heat dissipation member 30. In addition, since a large amount of heat is generated in the heat radiating member 30 during the operation of the project, it must be durable that does not deform even the heat. Preferably, the heat transfer sheet is made of rubber. In addition, the heat transfer member 50 has a substantially rectangular shape and at least one position alignment groove 51 is provided in a required position so as not to flow in the attached state.

In the optical projection system according to the present invention configured as described above, a large amount of heat generated from each of the LED modules 11 and 12 in the image realization process is installed to be in contact with the LED modules 11 and 12. Cooling by). At this time, the contact between the LED module 11 (12) and the heat dissipation member 30 by the sheet-shaped heat transfer member 50 is improved to facilitate the heat transfer between the two members. The heat transferred to the heat dissipation member 30 is heat exchanged with each other by the heat pipe 40, whereby each LED module 11, 12 is cooled while isothermally controlled.

The present invention has been described in an exemplary manner. The terminology used herein is for the purpose of description and should not be regarded as limiting. Many modifications and variations of the present invention are possible in light of the above teachings. Accordingly, the invention may be freely practiced within the scope of the claims unless otherwise stated.

The optical projection system according to the present invention as described above has the effect of maintaining a smooth image quality by adopting a heat transfer member that facilitates heat dissipation of a plurality of LED modules to maintain each LED module at the same temperature.

Claims (4)

An optical engine having at least two first and second LED modules; A bracket panel coupled to a rear surface of the optical engine to support the optical engine; A first heat dissipation member in contact with the first LED module; A second heat dissipation member in contact with the second LED module; A heat pipe supported by the bracket panel and connecting the first and second heat dissipation members in a thermal equilibrium; And And a heat transfer member interposed between the first and / or second LED module and the first and / or second heat dissipation member. The method of claim 1, The heat transfer member is an optical projection system, characterized in that consisting of a heat transfer sheet of rubber (Rubber) material. The method according to claim 1 or 2, The heat transfer member is an optical projection system, characterized in that attached to the LED module. The method of claim 3, wherein And said heat transfer member is substantially rectangular in shape and has one or more position alignment grooves.

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