KR20040027075A - Projection television - Google Patents

Abstract

Projected television is disclosed. Projected television according to the present invention, the cabinet 10 is installed so that the screen 11 is exposed to the outside; An LCD panel 41 for displaying an image; An illumination optical system 42 for irradiating light onto the LCD panel 41; A projection lens system 43 which enlarges and projects the image light produced by the LCD panel 41; And a reflection mirror 30 reflecting the enlarged projected image light to the screen 11, wherein the LCD panel 41 is biased toward either the left or right with respect to the optical axis L 'of the projection lens system 43. It is characterized in that the arrangement. According to the present invention having such a configuration, since the LCD panel 41 is disposed so as to be biased toward either of the left and right with respect to the optical axis L 'of the projection lens system 43, the optical including the LCD panel 41 is included. The arrangement of the engine 40 is not limited to the center of the cabinet 10 and can be variously changed.

Description

Projection television {

The present invention relates to a projection television, and more particularly, to a projection television that can reduce the overall volume by changing the installation position of the optical engine for generating the image light.

In general, a projection television is an image display apparatus designed to realize a large screen, and has a configuration in which an image generated by a display means installed in a cabinet is enlarged and projected onto a screen.

1 and 2 are side and plan views schematically showing the configuration of a conventional projection television. As shown in FIG. 1, a conventional projection television includes a cabinet 10 installed to expose a screen 11 on one surface thereof. And an optical engine 20 installed at the rear of the center speaker 12 in the center of the cabinet 10 to generate image light and to enlarge and project the generated image light, and a reflection mirror to reflect the projected image light to the screen 11. (30). The optical engine 20 is generated in the illumination optical system 21 for generating light, the liquid crystal display panel 22 (hereinafter, abbreviated as 'LCD panel') and the illumination optical system 21 as means for displaying an image. And a projection lens system 23 which enlarges and projects the image light generated while projecting the LCD panel 22 onto the reflection mirror 30.

In a projection television having such a configuration, image light is formed while the light generated by the illumination optical system 21 is transmitted to the LCD panel 22 whose transmittance changes according to the control voltage, and the image light is transmitted by the projection lens system 23. The image is displayed on the screen 11 after being magnified and projected toward the reflection mirror 30.

On the other hand, since the optical engine 20 should be installed at an appropriate distance from the screen 11 in order for the image to be formed on the screen 11 at an appropriate size, when the reflective mirror 30 is not provided, the optical engine 20 The cabinet 10 for accommodating the size is increased. Therefore, the distance between the optical engine 20 and the screen 11 can be reduced by appropriately changing the optical path of the image light using the reflecting mirror 30, and consequently, the volume of the television can be reduced. In this case, the size of the cabinet 10 is determined by the distance between the screen 11 and the reflection mirror 30.

In a conventional projection television, as shown in Figs. 1 and 2, the LCD panel 22 is disposed so as to be symmetrical with respect to the optical axis L, so that the optical axis L is positioned at the center of the screen 11. The center of the LCD panel 22 coincides with the center of the screen 11. Here, the sizes of the vertical projection angles C and C 'with respect to the screen 11 are the same, and the left and right projection angles D and D' also have the same size. In addition, the vertical projection ratios A and A 'for the screen 11 are the same, and the left and right projection ratios B and B' are also the same.

However, in the conventional projection television as described above, since the center of the LCD panel 22 and the center of the screen 11 are coincident with each other, the projection lens system 23 should be installed in the center of the cabinet 10, so that the optical engine ( The installation position of the 20) is limited, and thus, the internal space utilization of the cabinet 10 is lowered and there is a limit in reducing the volume thereof.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a projection television capable of changing an installation position of an optical engine, increasing utilization of internal space of a cabinet, and reducing overall volume.

1 is a side view schematically showing the configuration of a conventional projection television;

2 is a plan view of FIG.

3 is a plan view schematically showing the configuration of a projection television according to a preferred embodiment of the present invention, and

4 and 5 are front and side views of FIG. 3.

<Description of Symbols for Main Parts of Drawings>

10; cabinet 11; screen

30; reflective mirror 40; optical engine

41; LCD panel 42; lighting optical system

43; projection lens system

Projection television according to the present invention for achieving the above object, the cabinet is installed so that the screen is exposed to the outside; An LCD panel displaying an image; An illumination optical system for irradiating light to the LCD panel; A projection lens system for magnifying and projecting the image light produced by the LCD panel; And a reflection mirror for reflecting the magnified projected image light onto the screen, wherein the LCD panel is installed to be biased to one of right and left with respect to the projection lens system optical axis.

According to the present invention having the above configuration, since the LCD panel is installed so as to be biased either to the left or right with respect to the optical axis of the projection lens system, the arrangement of the optical engine including the LCD panel can be variously changed without restricting the center of the cabinet. Can be.

On the other hand, the projection lens system is preferably installed to be adjacent to the lower screen mounting surface of the cabinet.

In addition, the LCD panel is preferably installed so as to be biased either up or down with respect to the optical axis of the projection lens system.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of a projection television according to the present invention. For reference, in describing the present invention, the same reference numerals are given to the same parts as those in the related art.

As shown in Figs. 3 to 5, a projection television according to a preferred embodiment of the present invention is an optical system including a cabinet 10 provided with a screen 11, a reflection mirror 30, and an LCD panel 41. Engine 40.

The cabinet 10 is for supporting and protecting various components of the projection television, and one side of the cabinet 10 is installed so that the screen 11 displaying an image is exposed to the outside. In addition, various electronic devices are installed in the cabinet 10 under the screen 11. Among these electrical equipments, the center speaker 12 is installed at the center of the cabinet 10.

The reflection mirror 30 is fixed inside the cabinet 10 and reflects the image light projected from the optical engine 40 to the screen 11. Since the reflection mirror 30 should reflect the image light projected from the optical engine 40 to fit the size of the screen 11 so that a clear image is formed on the screen 11, the optical engine 40 and the screen 11 ) Is installed to have a proper distance and has a proper inclination angle.

The optical engine 40 includes an LCD panel 41, an illumination optical system 42, and a projection lens system 43. The LCD panel 41 displays an image while changing the transmittance of the liquid crystal according to the applied voltage, and the illumination optical system 42 irradiates the LCD panel 41 with light to generate the image light. The projection lens system 43 enlarges and projects the image light transmitted from the LCD panel 41 to the reflection mirror 30.

The LCD panel 41 is installed so as to be biased to one of the left and right with respect to the optical axis L 'of the projection lens system 43, wherein the left and right projection angles with respect to the screen 11 are F and F', and the left and right projections The ratios differ by E and E '. Accordingly, the projection lens system 43 for enlarging and projecting the image light may be disposed at a position other than the center of the cabinet 10, and thus, the arrangement of the optical engine 40 may be freed inside the cabinet 10.

As shown in FIG. 3 or 4, the optical engine 40 is installed to the left and right sides of the lower side of the cabinet 10 so as not to overlap the center speaker 12 under the cabinet 10 inner screen 11. Therefore, the projection lens system 43 of the optical engine 40 is adjacent to the lower surface of the screen 11 installation surface of the cabinet 10, and the reflecting mirror 30 is smaller than the installation position of the reflecting mirror 30 of the conventional projection television. It is installed to be close to the screen 11 side.

On the other hand, by changing the vertical position of the LCD panel 41 with respect to the optical axis L 'of the projection lens system 43, the width d of the cabinet 10 can be further reduced. That is, the LCD panel 41 may be installed such that the optical axis L 'is biased to one of the upper and lower sides of the LCD panel 41 so that the installation position of the reflective mirror 30 may be closer to the screen 11. . At this time, the vertical projection angle is H and H ', and the vertical projection ratio is G and G' have a difference.

The operation of the projection television configured as above will be described below.

When the voltage applied to the LCD panel 41 changes, the transmittance of the LCD panel 41 is changed to generate an image. At this time, the light generated by the illumination optical system 42 is irradiated to the LCD panel 41, and the light is transmitted through the LCD panel 41 to produce image light. The image light is reflected toward the projection lens system 43 by a reflector (not shown) provided on one side of the optical engine 40, and the image light passing through the projection lens system 43 is enlarged and projected onto the reflection mirror 30. The image light projected by the reflection mirror 30 is reflected and imaged on the screen 11. In the operation of such a projection television, the image light generated while passing through the LCD panel 41 installed to be biased to one side with respect to the optical axis L 'is screened so as to be biased to the opposite side to which the optical engine 40 is installed. Projected on). That is, as shown in FIG. 3, when the optical engine 40 is installed to the left side of the cabinet 10, the image light is shifted to the right side of the optical axis L 'with the left and right projection ratio E to E'. Projected onto the screen 11 to strike. Therefore, even if the optical engine 40 is biased toward either one of the left and right sides of the cabinet 10, the image 11 without distortion is displayed on the screen 11.

According to the present invention configured as described above, since the position of the LCD panel 41 with respect to the optical axis L 'of the projection lens system 43 can be provided so as to be biased to either of the right and left, the installation of the optical engine 40 The position can be freed inside the cabinet 10. Therefore, the optical engine 40 is disposed so as not to be in contact with the electrical equipment such as the center speaker 12, thereby reducing the width d of the cabinet 10 from, for example, 61 inches to 410 mm. Can be.

According to the present invention as described above, since the LCD panel is provided so as to be biased either to the left or right of the optical axis of the projection lens system, the arrangement of the optical engine is not limited to the center of the cabinet but is free inside the cabinet. Therefore, the optical engine may be disposed in consideration of the installation position of the electronic component, and the space utilization inside the cabinet may be increased.

Further, according to the present invention, since the optical engine and the reflecting mirror can be brought closer to the screen side of the cabinet, there is an effect that the volume of the projection television can be reduced.

While the invention has been shown and described with respect to preferred embodiments for illustrating the principles of the invention, the invention is not limited to the construction and operation as shown and described. Rather, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims. Accordingly, all such suitable changes, modifications, and equivalents should be considered to be within the scope of the present invention.

Claims (3)

A cabinet installed to expose the screen to the outside; An LCD panel displaying an image; An illumination optical system for irradiating light to the LCD panel; A projection lens system for magnifying and projecting the image light produced by the LCD panel; And And a reflection mirror reflecting the enlarged projected image light to the screen. And the LCD panel is installed so as to be biased either to the left or right with respect to the optical axis of the projection lens system. The method of claim 1, And the projection lens system is installed to be adjacent to a lower portion of the screen installation surface of the cabinet. The method according to claim 1 or 2, And the LCD panel is installed so as to be biased either upward or downward with respect to the optical axis of the projection lens system.