KR20010045874A - Holder for supporting a polarizing plate for a liquid crystal display projector - Google Patents

Abstract

PURPOSE: A polarizing plate supporting holder for a LCD projector is provided to enhance a cooling efficiency with respect to a polarizing plate. CONSTITUTION: A main body(401) has a penetration hole(401h) for receiving an outputting light from an optical lens of a LCD polarizing plate(410) at the central portion thereof. An upper fixing unit(402u) and a lower fixing unit(402d) are provided at four corners of the main body(401) for fixing the main body(401) to a penetration case. Polarizing plate receiving units(407a-407c) are provided at peripheral portion of the penetration hole(401h) for receiving the LCD polarizing plate(410) on the penetration hole(401h). Polarizing plate supporting protrusions(403a-403f) and polarizing plate fixing protrusions(404a-404c) are provided at peripheral portion of the penetration hole(401h) for supporting and fixing the LCD polarizing plate(410). An air ventilation guiding unit(405) is provided at one side of the main body(401) for introducing an air into the inner space of the main body(401) and partially preventing an outflow of the introduced air. An air outflow prevention unit(406) is provided at the other side of the main body(401) for preventing an outflow of the air introduced in the main body(401). The air ventilation guiding unit(405) is slantly formed for smoothly operating an air inflow and outflow simultaneously.

Description

Polarizer support holder for LCD projectors {Holder for supporting a polarizing plate for a liquid crystal display projector}

The present invention relates to a liquid crystal display (LCD) projector, and more particularly, to a holder for supporting a polarizing plate of an optical engine portion of an LCD projector. The present invention relates to a polarizing plate support holder for an LCD projector.

Liquid crystal (liquid crystal) is a material between the liquid and solid state and has an electro-optic property that transmits or blocks light according to the change of voltage and temperature. Therefore, the desired shape can be displayed by controlling the state of contrast by adjusting the voltage and temperature application of the specific portion. A display device using such a property is called an LCD (liquid crystal display device), and a device that combines an optical system and a light source with the LCD to enlarge and project an arbitrary image on an external screen is called an LCD projector.

1 is a schematic internal system diagram of a general LCD projector.

Referring to FIG. 1, the LCD projector 100 scatters a light source 101, a curved mirror 102 for reflecting the emitted light from the light source 101 in one direction, and a reflected light by the curved mirror 102. First and second fly eye lenses 103 and 104 and polarizing beam splitters for polarizing and splitting light incident through the FELs 103 and 104 ( 105, a first condenser lens 106 that focuses and emits light incident through the polarization beam splitter 105, and a first planar mirror 107 that receives and emits totally outgoing light from the first condenser lens 106. ), A second condensing lens 108 that focuses and emits light that is reflected by the first planar mirror 107, and a part of light incident through the second condensing lens 108 according to color (eg, The first dichroic mirror 109 and the first dichroic mirror 109 that reflect blue light and green light, and transmit a portion (red light). A second planar mirror 110 for totally reflecting the light transmitted through the incident light, a third condensing lens 111 for focusing and exiting the light reflected by the second plane mirror 110, and the first dichroic To the second dichroic mirror 112 and the second dichroic mirror 112 which partially reflect (eg, green light) the light incident by the mirror 109 and transmit a portion (eg, blue light). A fourth condensing lens 113 for condensing and exiting the light reflected and incident by the light; and a relay lens system 114 and 116 for condensing and outputting the light transmitted by the second dichroic mirror 112, respectively ( 118, third and fourth planar mirrors 115 and 117 for forming optical paths to the relay lens systems 114, 116 and 118, and the third and fourth condensing lenses 111 and 113. And three corresponding color LCDs 119 (1) for transmitting or blocking three colors (red, green, blue) light incident through the relay lens systems 114, 116, and 118 according to conditions. 20, 121, dichroic prism 122 which emits light incident through three LCDs 119, 120, 121 by reflection and transmission according to color, and dichroic prism 122 It is composed of a projection lens 123 for projecting the light incident through the ().

On the other hand, in the LCD projector 100 of the above configuration, the heat is generated as the device operates, the most vulnerable to the heat of the components inside the device are the three LCD 119, 120 ( 121). That is, when more than about heat is applied to the LCD 119, 120, 121, the electro-optical characteristics of the LCD 119, 120, 121 may change, causing the LCD 119, 120, 121 to malfunction. The LCD 119, 120, 121 itself may be burned out. Therefore, there is a need to properly cool the LCD 119, 120, 121. To this end, as shown in FIG. 2, a ventilation fan 201 is installed on an upper portion of the three LCDs 119, 120, and 121 on which the three LCDs 119, 120, 121 are installed, thereby dissipating heat (hot air) inside the device to the outside. By cooling the LCD 119, 120, 121 is taken.

By the way, in relation to the LCD cooling method, a conventional mounting structure of the LCD 121 (hereinafter referred to as a blue polarizing plate, which will be described as a representative for convenience), as shown in Figure 3, the blue polarizing plate ( 121 was directly attached to the light-cylinder case 301 together with the lens 118 constituting the relay lens system. Accordingly, two opposite sides of the four sides of the blue polarizing plate 121 are blocked from the external space by the wall of the light tube case 301, and only the remaining two opposite sides are exposed to the external space. Therefore, when the ventilation fan 201 is driven, the air flow is formed from the bottom of the blue polarizer 121 to the top as indicated by the arrow. That is, air flows while passing through both surfaces of the blue polarizer 121, and the blue polarizer 121 is cooled in the process. However, the above structure has a problem that the flow rate of air in contact with the blue polarizing plate 121 is small, and the contact time between the air and the blue polarizing plate 121 is short, and thus the blue polarizing plate 121 cannot be sufficiently cooled.

The present invention has been made to improve the above problems, and an object thereof is to provide a polarizing plate support holder for an LCD projector that can further enhance the cooling efficiency for the polarizing plate.

1 is a schematic internal system diagram of a typical LCD projector.

2 is an internal system configuration diagram of an LCD projector employing a conventional polarizing plate holder structure.

3 is a view showing a polarizing plate cooling method by a conventional polarizing plate holder structure.

Figure 4 is a perspective view showing the structure of a polarizing plate support holder for an LCD projector according to the present invention.

5 is a perspective view showing a state in which a polarizing plate support holder for an LCD projector according to the present invention is installed in a light barrel case;

Figure 6 is a partial excerpt of an internal system of an LCD projector employing a polarizing plate support holder for an LCD projector according to the present invention.

<Explanation of symbols for main parts of drawing>

101 Light source 102 Surface diameter 105 Polarized beam splitter

103,104 ... 1st, 2nd FEL (fly eye lens)

106,108,111,113 ... First, Second, Third, Fourth Condensing Lens

107,110,115,117 ... first, second, third, fourth plane mirror

109,112 ... 1st, 2nd dichroic mirror

Relay lens system 122 ... Dichroic prism

119,120,121,410 ... LCD polarizer 123 ... projection lens

201 ... Ventilation fan 301,501 ... Canister case

401 Main body 402 u Upper fixing part

402d ... lower fixing part 403a to 403f ... polarizing plate support protrusion

404a to 404c ... polarizing plate fixing protrusion 405

406 Air leak prevention parts 407a to 407c Polarizing plate seat

401h ... through hole

In order to achieve the above object, a polarizing plate support holder for an LCD projector according to the present invention comprises a frame of a composite system composed of a plurality of LCD polarizing plates of an LCD projector and optical lenses that respectively inject light into the plurality of LCD polarizing plates. As being fixed to the light tube case to form,

A main body portion having a through hole for receiving the light emitted from the optical lenses and the mounting of the LCD polarizing plate at the center of the body;

An air distribution guide part provided at one side of the main body part to prevent the inflow of air into the inner space of the main body part in the state where the LCD polarizer is seated and the outflow of the introduced air; And

It is characterized in that it is provided on the other side of the main body portion opposed to the air distribution guide portion, and includes an air leakage prevention unit for preventing the outflow of air introduced into the inner space of the main body portion.

Here, preferably provided in approximately four corners of the main body portion, a plurality of upper and lower fixing portions for fixing the main body portion to the optical case, and the peripheral portion of the through hole in the main body portion is provided in the LCD polarizer A plurality of polarizing plate seating portion for seating in the through-hole and provided in the periphery of the through-hole of the main body portion, and further comprising a plurality of polarizing plate support / fixing projections for supporting and fixing the LCD polarizing plate seated in the through-hole It has its features.

According to the present invention, the holder structure for fixing / supporting the LCD polarizing plate is a structure independent from the conventional case, unlike the conventional case, the air can be circulated to move therein. Since the flow to both sides of the LCD polarizer, as well as the conventional flow into the holder structure is circulated, there is an advantage that can sufficiently cool the LCD polarizer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 and 5 show a polarizing plate support holder for an LCD projector according to the present invention, Figure 4 is a perspective view showing the structure of the holder, Figure 5 is a perspective view showing a state in which the holder is installed in the light barrel case.

4 and 5, the polarizing plate support holder 400 for an LCD projector according to the present invention forms a whole skeleton, and the LCD polarizing plate 410 is seated at the center of the body and is emitted from the optical lens 118. It is provided in the main body portion 401, the through-hole 401h is formed to receive light, and approximately four corners of the main body portion 401, the main body portion 401 is a light barrel case 501 The upper fixing portion 402u and the lower fixing portion 402d for fixing (matching) to the periphery of the through hole 401h of the main body 401, and the through hole of the LCD polarizing plate 410 The polarizing plate seating portions 407a to 407c for mounting on the 401h and the periphery of the through hole 401h of the main body portion 401 are provided to support and support the LCD polarizing plate 410 seated in the through hole 401h. Polarizing plate support protrusions 403a to 403f and polarizing plate fixing protrusions 404a to 404c for fixing, and provided on one side of the main body portion 401, LCD polarization The air flow guide portion 405 and the air flow guide portion 405 and the air flow guide portion 405 for preventing the inflow of air into the inner space of the main body portion 401 in the state in which the 410 is seated It is provided on the other side of the main body portion 401 facing each other, and is provided with an air leakage prevention unit 406 for preventing the outflow of air introduced into the inner space of the main body portion 401. Here, the air flow guide 405 is not only a function of air inflow into the inner space of the main body portion 401, but also to have a function of blocking the flow of the introduced air to some extent, As shown, it is provided to be inclined at a predetermined angle. This is to block the outflow of the air so introduced to the outside, to increase the flow and residence time of the air in the inner space of the main body 401, to further enhance the cooling efficiency of the LCD polarizing plate 410 will be.

Then, the mechanism for cooling the LCD polarizer in the LCD projector employing the polarizing plate support holder 400 for the LCD projector according to the present invention having the above configuration will be briefly described.

6 is a partial excerpt of an internal system of an LCD projector employing a polarizing plate support holder for an LCD projector according to the present invention.

As shown in FIG. 6, the polarizing plate support holder 400 for an LCD projector according to the present invention includes a plurality of LCD polarizing plates 119 to 121 (see FIG. 1) inside the projector, and a plurality of LCD polarizing plates 119 to 121. ) Is fixedly installed in the light tube case 501 forming a frame of a composite system composed of optical lenses 111, 113, and 118 (see FIG. 1) which finally enter light.

As described above, when the ventilation fan 201 installed above the light tube case 501 is operated while the polarizing plate support holder 400 for the LCD projector according to the present invention is installed on the light case 501 inside the projector, Cool air from outside is introduced into the synthesis system of the projector through an air inlet (not shown) provided at the bottom. The inside and the outside of the LCD polarizing plate 410 are cooled by the introduced air. At this time, the air introduced into the holder 400 cools the LCD polarizer 410 while flowing in the direction of the arrow, as shown. That is, air introduced into the synthesis system of the projector from the outside is introduced into the gap between the light case 501 and the air flow guide 405, and the gap is narrow so that the air is introduced into the holder 400 at a high flow rate. . Then, the introduced air flows further inward, but is blocked by the wall of the air leakage prevention part 406 to prevent the outflow to the outside, and flows U-turn toward the inlet again. Then, the U-turned air is again blocked by the air flow guide portion 405, and part of the flow again flows into the holder, and a part flows out into the gap between the light flow case 501 and the air flow guide portion 405. As described above, the flow of air in the holder structure is higher than the flow of air in the holder structure, that is, the flow of air that touches both sides of the polarizing plate from the lower part of the polarizing plate to the upper part, and the flow rate of the air in contact with the polarizing plate is increased. The contact time is much longer. Therefore, the polarizing plate 410 can be sufficiently cooled.

As described above, the polarizing plate support holder for an LCD projector according to the present invention, unlike the conventional holder structure, is an independent structure separate from the light tube case, and the circulation of air can be moved therein, thereby operating the ventilation fan. When the air flows to both sides of the LCD polarizer as well as the conventional, it is introduced into the holder is circulated to move, there is an advantage that can sufficiently cool the LCD polarizer. Therefore, when the polarizing plate support holder of the present invention is employed in the LCD projector, not only can the reliability of the performance of the product be further enhanced, but also the life of the product can be further extended.

Claims (3)

It is fixedly installed in a light-transmitting case forming a frame of a composite system composed of a plurality of LCD polarizers of an LCD projector and optical lenses that finally inject light into the plurality of LCD polarizers. A main body portion having a through hole for receiving the light emitted from the optical lenses and the mounting of the LCD polarizing plate at the center of the body; An air distribution guide part provided at one side of the main body part to prevent the inflow of air into the inner space of the main body part in the state where the LCD polarizer is seated and the outflow of the introduced air; And It is provided on the other side of the main body portion opposed to the air flow guide portion, the polarizing plate support holder for LCD projector, characterized in that it comprises an air leakage prevention unit for preventing the outflow of air introduced into the inner space of the main body portion. The method of claim 1, A plurality of upper and lower fixing parts provided at approximately four corners of the main body part and for fixing the main body part to the light barrel case; Is provided in the periphery of the through-hole of the main body portion, a plurality of polarizing plate mounting portion for mounting in the through-hole of the LCD polarizing plate; And And a plurality of polarizing plate support / fixing protrusions provided on the periphery of the main body part and supporting and fixing the LCD polarizing plate seated in the through hole. The method of claim 1, The air distribution guide supports the polarizing plate for the LCD projector, which is inclined at a predetermined angle on one side of the main body so as to introduce air into the inner space of the main body and prevent some of the introduced air from flowing out. holder.