KR100692052B1 - Optical engine control apparatus for rear-projection television system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination system adjusting apparatus of a rear projection television, which is capable of freely adjusting a reflection mirror that reflects light emitted from a light source to an effective transmission area of an LCD panel.

According to a preferred embodiment, the illumination system adjusting device is formed such that the first end and the second end have mutually stepped shapes such that the reflecting mirror is disposed to be inclined to the optical engine base, and the first end and the first and second ends of the illuminating system adjusting device The second mirror adjustment screw is installed to be supported by the first and second elastic springs provided between the bottom of the first stage and the first support surface of the optical engine, and the third mirror adjustment screw is mounted on the second stage. And a mirror fixing holder installed to be supported by a third elastic spring provided between the bottom of the stage and the second supporting surface of the optical engine, and individually or collectively adjusting the first to third mirror adjusting screws. The illumination axis reflected from the reflection mirror can be adjusted to match the effective transmission area of the LCD panel.

Description

Illumination system control device of rear projection TV {OPTICAL ENGINE CONTROL APPARATUS FOR REAR-PROJECTION TELEVISION SYSTEM}

1 is a view for explaining the outline of a general rear projection television;

FIG. 2 is a schematic diagram illustrating a representative optical engine applied to the rear projection television shown in FIG. 1;

3A is a view showing an example of a configuration for adjusting the illumination system of the optical engine shown in FIG.

3B is a view showing the configuration of another example for adjusting the illumination system of the optical engine shown in FIG.

4 is a view showing an illumination system adjusting apparatus for a rear projection television according to a preferred embodiment of the present invention;

FIG. 5 is a schematic diagram for explaining an illumination adjustment state by the illumination system adjustment apparatus of the rear projection television shown in FIG. 4.

* Explanation of symbols for main parts of drawings *

2: optical engine, 3: projection lens,

4: reflecting mirror, 5: screen,

11: light source, 17a, 17b, 17c: reflective mirror,

L1, L2, L3: LCD panel, 31: mirror fixing holder,

32: optical engine base, 34: mirror adjustment screw,

41, 42: mirror holder, 43: holder

41a, 45b: mirror adjustment screw, 50: mirror fixing holder,

51: optical engine base, 52, 53, 56: first to third mirror adjustment screw.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination system adjusting device of a rear projection television, and more particularly, an illumination system (particularly an illumination mirror or a mirror) such that an illumination axis of an illumination system of an optical engine employed in a rear projection television is uniformly transmitted to an image imager (LCD panel). The illumination system adjustment apparatus of the rear projection television by which free adjustment of a reflection mirror) is attained.

In general, a so-called 'projection television' employing a projection television or an LCD projector (Projector) is a representative large-screen image processing device designed to project the light from the light source to the screen through the illumination system and the photosynthesis enlarged.

1 is a view for explaining the outline of a general rear projection television.

In the figure, according to the rear projection television indicated by reference numeral 1, an optical engine 2 for irradiating light, a projection lens 3 for expanding and projecting light passing through the optical engine 2, and the projection lens 3 Is equipped with a reflection mirror (or illumination mirror) 4 for reflecting the projected light magnified through the entire surface of the screen, and a transmissive screen 5 for realizing an image by the light reflected from the reflection mirror 4. do.

Typically, the reflection mirror 4 is mounted on the rear surface of the upper cabinet 8 of the outer case 6 so that the light projected through the projection lens 3 is reflected toward the transmissive screen 5 side, and the The transmissive screen 5 is mounted on the front side of the outer case 6 opposite the reflecting mirror 4 so that the light reflected through the reflecting mirror 4 is projected onto its entire surface.

FIG. 2 is a schematic diagram illustrating a representative optical engine applied to the rear projection television shown in FIG. 1.

According to the optical engine 2, the light source 11 which produces white light, the reflector 12 which reflects the white light produced by the light source 11 in one direction, and the illumination area of the white light reflected through the reflector 12 FEL part 13 having first and second FEL (13 Eye and Lens) 13a, 13b for uniform light intensity to suit the size of LCD panel, and the white light adjusted in the FEL part 13 is the polarization ratio. First and second dichroic polarized in a splitting beam splitter (PBS) 14 to separate the white light into R / G / B color light when illuminated by an illumination lens 15. Reflecting mirrors 17a, 17b, and 17c reflecting light of R / G / B colors separated by the mirrors 16a and 16b, their first and second dichroic mirrors 16a and 16b, and the light outside A specific lens separated by the condenser lens 18 and the first and second dichroic mirrors 16a and 16b for condensing the light so that the straightness is corrected without being spread The dichroic lenses 17a, 17b and 17c from which color light is filtered again, and the LCD panels L1, L2 and L3 activated by light of a specific color passing through the dichroic lenses 17a, 17b and 17c. And a dichroic to project the image of a certain color generated by each of the LCD panels L1, L2, and L3 to be combined and converted into a complete image so as to be projected on the screen (5 in FIG. The prism 20 is provided.

Here, the reflection mirrors 17a, 17b and 17c (corresponding to the reflection mirror 4 of FIG. 1) reflecting the white light adjusted by the FEL unit 13 are the FEL unit 13 and the PBS 14 and The light from the light source 11 passing through the condenser lens 15 plays an important role in accurately transmitting the LCD panels L1, L2, and L3, if the reflecting mirrors 17a, 17b, and 17c. When the light reflected by the light is transmitted to each of the LCD panels L1, L2, and L3 while being smaller than the effective projection area of the LCD panels L1, L2, and L3, the screen is cut.

On the contrary, when the light reflected through the reflecting mirrors 17a, 17b, and 17c is transmitted to the LCD panels L1, L2, and L3 larger than their effective projection area, the brightness of the light is lowered and projected onto the screen. The brightness of the image is deteriorated.

Therefore, in order for the light from the light source 11 reflected through the reflecting mirrors 17a, 17b, 17c to be accurately transmitted to the LCD panels L1, L2, L3, the reflecting mirrors 17a, 17b, Accurate adjustment of 17c) is required.

FIG. 3A is an example of a configuration for adjusting the illumination system of the optical engine shown in FIG. 2 and shows an adjustment structure for one reflection mirror 17a.

That is, the mirror fixing holder 31 is disposed on the rear surface of the reflective mirror 17a, and one end of the mirror fixing holder 31 is fixed to the optical engine base 32 by the fixing screw 33, and the reflection A mirror adjustment screw 34 penetrating a predetermined position of the mirror fixing holder 31 is connected to the lower end of the mirror 17a, and the mirror adjustment between the reflection mirror 17a and the mirror fixing holder 31 is performed. The outer circumference of the screw 34 is provided with an elastic spring 35.

Therefore, as the mirror adjustment screw 34 is rotated in the direction of arrow '34a', the reflection mirror 17a is adjusted in the direction of the arrow '36' with respect to the mirror fixing holder 31.

However, in the structure shown in FIG. 3A, since the reflection mirror 17a can only adjust in one direction, a degree of freedom of adjustment with respect to the illumination system is not guaranteed.

FIG. 3B is a configuration of another example for adjusting the illumination system of the optical engine shown in FIG. 2 and shows an adjustment structure for one reflection mirror 17a.

First and second mirror fixing holders 41 and 42 are sequentially disposed on the rear surface of the reflective mirror 17a, and one end of the rear surface of the second mirror fixing holder 42 is screwed to an optical engine base (not shown). The holder clip 44 is fixed to the fixed holder 43 to be fixed.

The first mirror adjustment screw 45a is installed through the long hole 42a formed at the upper bent surface of the second mirror fixing holder 42 and connected to the upper bent surface of the first mirror fixing holder 41. A first elastic spring 45b is formed at the outer circumference of the first mirror adjustment screw 45a between the upper bent surface of the first mirror fixing holder 41 and the upper bent surface of the second mirror fixing holder 42. Is placed.

In addition, the second adjustment screw 46a penetrates through a long hole (not shown) formed in one side end bent surface of the second mirror fixing holder 42, and one side end bending surface of the first mirror fixing holder 41 is provided. The outer side of the second mirror adjustment screw (46a) between the bent surface of the one end of the first mirror fixing holder 42 and the one end surface of the second mirror fixing holder (42) Two elastic springs 46b are disposed.

Therefore, in the configuration shown in FIG. 3B, the reflection mirror 17a can be positioned in the horizontal / vertical direction by the first and second mirror adjustment screws 46a and 46b. Compared to the structure of, the degree of freedom of adjustment to the illumination system is improved.

However, even in the configuration shown in Fig. 3b, since only two-axis (X / Y-axis) adjustment of the illumination system is possible, the degree of freedom of adjustment with respect to the effective projection area of the LCD panel is still limited. .

Accordingly, the present invention has been made in view of the above-described situation of the prior art, and enables the LCD panel to be freely adjusted in three directions (X-axis, Y-axis, and Z-axis) with respect to the illumination system of the optical engine. It is an object of the present invention to provide an illumination system adjusting device of a rear projection television for achieving a high degree of adjustment of the illumination axis with respect to the effective light emission area.

In order to achieve the above object, according to a preferred embodiment of the present invention, in the optical engine illumination system of a rear projection television, which is equipped with a reflecting mirror for reflecting light emitted from a light source toward an effective light emitting area of an LCD panel, The second stage is formed with a mutual step so that the reflective mirror is formed to be inclined to the optical engine base, and the first stage has first and second mirror adjustment screws on both sides of the bottom of the first stage and the optical engine. It is installed so as to be supported by the first and second elastic springs provided between the first ground of the ground, the second end of the third mirror adjustment screw between the bottom of the second stage and the second ground of the optical engine There is provided an illumination system adjusting device for a rear projection television comprising a mirror fixing holder installed to be supported by a third elastic spring installed at the.

Preferably, according to the present invention, the second end is defined on one side of the mirror fixing holder.

In the illumination system adjusting apparatus of the rear projection television according to the present invention, the first stage and the second stage of the mirror fixing holder are connected to the optical engine base with a step difference, and the first to second stages are provided to the first stage and the second stage. Individual adjustment or combined adjustment of the three mirror adjustment screws enables free adjustment of the illumination axis by the reflection mirror.

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

4 is a view showing an illumination system adjusting apparatus of a rear projection television according to a preferred embodiment of the present invention.

Referring to the drawings, the illumination system adjusting device according to the present invention, when assuming the adjustment of one reflecting mirror (17a in Figure 2), the mirror fixing holder 50 as a reflecting mirror adjusting member to which the reflecting mirror 17a is fixed is The reflective mirror 17a is formed to be inclined with respect to the illumination direction, so that the first end 50a and the second end 50b of the mirror fixing holder 50 have a constant step.

The first end 50a, which is bent upwardly and bent from one side of the mirror fixing holder 50 at the mounting position of the reflective mirror 17a defined in the optical engine base 51, is first and second on both sides thereof. Mirror adjustment screws 52 and 53 are fastened to engage the first support surface 51a of the optical engine base 51. Further, between the bottom of the first end 50a and the first support surface 51a, the first and second elastic springs 54, circumference of the first and second mirror adjustment screws 52, 53 are provided. 55 is provided correspondingly.

In addition, the second end 50b is defined only on one side of the mirror fixing holder 50 at the mounting position of the reflection mirror 17a defined in the optical engine base 51. 50b is formed lower than the first end 50a according to the inclined shape of the mirror fixing holder 50.

A third mirror adjustment screw 56 is provided at the second end 50b, and the third mirror adjustment screw 56 penetrates through the second end 50b to form an inner side of the optical engine base 51. Of the third mirror adjustment screw 56 connected to a second support surface (or support jaw) 51b provided between the bottom surface of the second end 50b and the second support surface 51b. The outer circumference is provided with a third spring 57.

Therefore, the mirror fixing holder 50 as the reflection mirror adjusting member having the above-described structure has the illumination axis adjustment in the 3-axis direction according to the adjustment state of the first to third mirror adjusting screws 52, 53 and 56. It becomes possible.

For example, in the case of adjusting only the first / second mirror adjusting screw 52 or 53 or adjusting only the third mirror adjusting screw 56, the horizontal (or vertical) direction depends on the installation direction of the mirror fixing holder 50. Can be adjusted.

In addition, when the second and third mirror adjustment screw (52, 56) is adjusted or the second and third adjustment screw (53, 56) or the first to third mirror adjustment screw (52, 53, 56) In the case of adjusting only one of?), 2-direction adjustment is possible.

In contrast, when the first to third mirror adjustment screws 52, 53 and 56 are all adjusted, the illumination reflection distance with respect to the reflection mirror 17a can be adjusted.

Therefore, the LCD panel to which the light reflected from the reflection mirror 17a (that is, the shape of 'illumination' in FIG. 5) corresponding to the first to third mirror adjustment screws 52, 53, and 56 is appropriately adjusted. It can be adjusted to suit the effective light emitting area ('effective screen' in FIG. 5).

 On the other hand, the present invention is not limited to the above embodiments, and various changes and modifications can be made within the scope not departing from the technical gist and gist of the invention. That is, in the above embodiment, the case where the illumination system adjustment device according to the embodiment of the present invention is applied to the rear projection television has been described. However, if the structure for illuminating the light emitted from the light source to the LCD panel by the reflection mirror or the illumination mirror is adopted, Preferably application is possible.

As described above, according to the illumination system adjusting device of the rear projection television according to the present invention, the reflecting mirror is fixed to the mirror fixing holder as the reflecting mirror adjusting member provided on the optical engine base such that the first and second stages have a step. Since the adjustment of the reflection mirror is performed with sufficient degrees of freedom by the first to third mirror adjustment screws provided at the first end and the second end, the light incident on the LCD panel in the reflection mirror is effective for the LCD panel. It is adjustable to match the light emitting area, thereby improving the brightness of the screen.

Claims (2)

In an optical engine illumination system of a rear projection television comprising a reflecting mirror reflecting light emitted from a light source toward an effective light emitting area of an LCD panel, The first stage and the second stage are formed with a mutual step so that the reflective mirror is shaped so as to be inclined to the optical engine base, First and second mirror adjustment screws are installed at both sides of the first stage so as to be supported by first and second elastic springs provided between the bottom surface of the first stage and the first supporting surface of the optical engine. And the second mirror adjusting holder is provided with a mirror fixing holder provided to be supported by a third elastic spring provided between the bottom surface of the second stage and the second supporting surface of the optical engine. Illumination system adjuster for projection televisions. The apparatus of claim 1, wherein the second end is defined at one side of the mirror fixing holder.

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