KR100869194B1 - Projection TV having dual reflect plate - Google Patents

Abstract

The present invention discloses a projection television having a reflecting plate having a double reflecting surface which improves the reflecting structure of image light.

A projection television having a double reflector according to an embodiment of the present invention comprises: image generating means for projecting image light; A first double reflecting plate for enlarging the image light from the image generating means in a first direction and double reflecting the enlarged image light to emit in a second direction; And a second double reflecting plate which enlarges the image light emitted from the first double reflecting plate in the second direction and double-reflects the enlarged image light to emit in the normal direction of the screen, thereby reflecting the projected image light. New improvements can significantly reduce the thickness of the projection television.

Description

Projection TV having dual reflect plate

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection television, and more particularly to a projection television having a novel light reflecting structure for expanding and projecting image light by using a reflecting plate having a double reflecting surface.

Projection television generates images by using specially designed image generating means such as small cathode ray tube (CRT) or liquid crystal display (LCD) as an image source, and magnifies and projects the image on a large screen through a projection lens. It is an image projection system that displays.

1 is a block diagram showing a structure of a conventional general rear projection type projection television.

A conventional rear projection type projection television has a projection lens unit for expanding and projecting the image generating means 1 for generating and emitting image light, such as a cathode ray tube or a liquid crystal display element, and the image light emitted from the image generating means 1 ( 2) is built into the rectangular box-shaped cabinet 5, and the image path enlarged and projected from the projection lens unit 2 is changed by the reflecting mirror 3 installed so as to be inclined at the rear part of the cabinet 5 so that the cabinet An image is displayed by causing an image to form on the screen 4 provided in the front part of (5).

Such a projection television has an advantage that it can meet the needs of consumers who want a large screen because it is cheaper and easier to implement a large screen than an LCD TV or a PDP TV. However, in order to enlarge the screen, an appropriate distance must be maintained between the image generating means 1 and the screen 4 for generating the image light in order to secure a space where the image light proceeds, so that the thickness of the projection television becomes thick and large. There are disadvantages.

Accordingly, an object of the present invention for solving the above-mentioned problem is to provide a slimmer projection television by improving the reflection structure of the image light in the projection television.

Projection television having a double reflector of the present invention for achieving the above object, the image generating means for projecting image light; A first double reflecting plate for enlarging the image light from the image generating means in a first direction and double reflecting the enlarged image light to emit in a second direction; And a second double reflecting plate configured to enlarge the image light emitted from the first double reflecting plate in the second direction and double reflect the enlarged image light to emit in the normal direction of the screen.

A projection television having a double reflector according to another embodiment of the present invention comprises: image generating means for projecting image light; A first double reflecting plate for enlarging the image light from the image generating means in a first direction and double reflecting the enlarged image light to emit in a second direction; A second double reflecting plate configured to enlarge the image light emitted from the first double reflecting plate in the second direction and to double reflect the enlarged image light to emit in the third direction; And a third double reflecting plate configured to enlarge the image light emitted from the second double reflecting plate in the third direction and double reflect the enlarged image light to emit in the normal direction of the screen.

A projection television having a double reflector according to another embodiment of the present invention comprises: image generating means for projecting image light; A diffusion lens that receives the image light from the image generating means and diffuses it in a first axis direction; A collimated lens for converting the image light diffused by the diffusion lens into parallel light and outputting the parallel light; And a double reflecting plate configured to enlarge the image light emitted from the collimated lens in a second direction and to double-reflect the enlarged image light to emit in the normal direction of the screen.

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

The projection television according to the present invention improves the reflection structure of the image light by using a plurality of double reflecting plates, each of the double reflecting plate is provided on the light guide plate and the back of the light guide plate has a reflecting plate for double reflecting light. In the following description, for convenience of description, the configuration of the double reflector is divided into a light guide plate and a reflector.

2 and 3 are views showing the reflection structure of the projection television according to the first embodiment of the present invention, respectively, in which an enlarged image is enlarged in the X-axis direction and the Y-axis direction using two dual reflecting plates. Indicates the projection structure.

The projection television of this embodiment includes an image generating means 1, a first light guide plate (LGP) 10, a first reflecting plate 20, a second light guiding plate 30, a second reflecting plate 40 and a screen ( 4) is provided. Here, the image generating means 1 and the screen 4 perform the same functions as those in Fig. 1, and therefore have been given the same reference numerals, and detailed descriptions of the structure and functions are omitted below.

The first LGP 10 extends the image light incident from the image generating means 1 formed on one side of the first LGP 10 in the X-axis direction of the screen 4 to one side of the second LGP 30. Project. As shown in FIGS. 2 and 3, the first light guide plate 10 has a tapered shape that becomes thinner as it moves away from the image generating means 1. In particular, the front surface of the first light guide plate 10 proximate to the second light guide plate 30 (hereinafter, referred to as the front surface) may emit light from each light guide plate so that the incident image light may be better projected toward the second light guide plate 30. The surface thereof is formed to be parallel to the second light guide plate 30, while the rear surface thereof (hereinafter referred to as the rear surface refers to the surface opposite to the direction in which light is emitted from each light guide plate) is formed to be inclined at an angle. It has a tapered shape. In addition, an image generating means 1 is provided at one side of the first light guide plate 10 to project image light onto the first light guide plate 10, and the image light incident on the first light guide plate 10 is tapered. Due to the characteristic of (10), the screen 4 is enlarged by the width (that is, the length of the horizontal (X) axis of the screen). In this case, the thickness of the first light guide plate 10 is varied according to the size of the screen 4.

The first reflecting plate 20 is formed on the rear surface of the first light guide plate 10 and double reflects the image light incident on the side of the first light guide plate 10, and thus from the image generating means 1 as shown by the arrow of FIG. 2. The image light incident in parallel is bent at approximately 90 ° with respect to the traveling direction thereof so as to be projected to the side of the second light guide plate 30. To this end, the first reflecting plate 20 has a plurality of dual reflecting surfaces that are continuously formed along the rear surface of the first light guide plate 10 formed in a tapered shape, and is incident from the side surface of the first light guide plate 10 and enlarged. The image light is double reflected by the corresponding double reflecting surfaces according to its incident position. That is, each of the double reflecting surfaces first reflects the image light incident on the first LGP 10 by a predetermined portion in order according to its incidence position in the opposite direction to the second LGP 30, and then reflects the primary light. The image light is secondarily reflected again so that the image light is incident perpendicularly to the side surface of the second light guide plate 30. As described above, in the present invention, the image light incident on the first LGP 10 may be reflected in a predetermined direction (normal to the side of the second LGP 30) without being diffusely reflected in various directions. Only the size of the image light is enlarged in the X-axis direction so as to be projected onto the second LGP 30.

The second light guide plate 30 is formed to be spaced apart from the screen 4 at the rear side of the screen 4 at an interval, and the image light incident from the first light guide plate 10 is enlarged in the Y-axis direction of the screen 4. Projected onto the screen (4). Compared to the first LGP 10, the second LGP 30 has a different direction in which image light is enlarged, and thus, the operation principle and configuration of the second LGP 30 are different from each other. . Therefore, the image light enlarged in the X-axis direction by the first light guide plate 10 is again enlarged in the Y-axis direction by the second light guide plate 30 as shown by the arrow of FIG. At this time, the thickness of the second light guide plate 30 varies depending on the size of the screen 4.

The second reflector 40 is formed on the rear surface of the second light guide plate 30 to double reflect the image light incident on the side surface of the second light guide plate 30, and thus, as shown by the arrow of FIG. 3, from the first light guide plate 10. The image light incident in parallel is bent at approximately 90 ° with respect to the direction of travel so that it is projected to the front of the screen 4. The second reflector 40 also differs only in size, and its configuration and operation principle are the same as those of the first reflector 20.

FIG. 4 is a cross-sectional view illustrating in detail the structure of the double reflecting surface in the reflecting plates 20 and 40 of FIGS. 2 and 3.

Each of the double reflecting surfaces of the first reflecting plate 20 may include a first reflecting surface that primarily reflects image light incident from the image generating means 1 into the first light guide plate 10 in a direction opposite to the second light guide plate 30. 22 and image light reflected primarily from the first reflecting surface 22 toward one side of the second light guide plate 30 in a normal direction (or close thereto) to one side of the second light guide plate 30. A second reflecting surface 24 for differentially reflecting is provided. Each of the double reflecting surfaces of the second reflecting plate 40 may include a third reflecting surface that primarily reflects image light incident from the first light guide plate 10 to the second light guide plate 30 in a direction opposite to the screen 4. 42 and a fourth reflecting surface 44 for secondarily reflecting the image light reflected by the third reflecting surface 42 toward the screen 4 in the normal direction of the screen 4 (or near thereto). Equipped.

At this time, the first reflecting surface 22 to the fourth reflecting surface 44 have an elliptical shape concave with respect to the incident light. Accordingly, the image light reflected by the first reflector 20 and then projected onto the second reflector 40 and the projected light onto the screen 4 after being reflected by the second reflector 40 may be The exit order remains the same.

That is, as shown in FIG. 4, the image light incident on the light guide plates 10 and 30 in order from the bottom is reflected from the corresponding double reflecting surface and is projected in the order of ①, ②, ③ from the left. On the screen 4, the original image identical to the image projected by the image generating means 1 is perfectly reproduced and displayed on the screen 4.

In FIG. 4, the reflective surfaces 22, 24, 42, and 44 are formed of concave mirrors having a concave ellipse, but the present invention is not limited thereto. That is, the function of the double reflecting surfaces 22 and 24 in the present invention is to change the traveling direction so that the image light incident on the light guide plate 10 from the light source 1 is emitted to the light guide plate 30. Since the functions of the 32 and 34 are to change the traveling direction so that the image light reflected from the double reflecting surfaces 22 and 24 and incident on the light guide plate 30 is emitted to the screen 4, the respective light guide plates 10 and 30 Reflectors formed on the back of the panel can only change the traveling direction of the incident light perpendicular to the incident direction {(incident angle of primary reflected light + reflection angle) + (incident angle of secondary reflected light + reflection angle) = 90 °} The shape of the reflecting surfaces 22, 24, 32, 34 is not limited to the shape of a concave mirror as in the above embodiment. Like the double reflecting surface of the present invention, since it is a technology that is already used in the optical system, such as a reflecting telescope, to change the direction of the light by using two reflecting surfaces will not be described in detail.

Fig. 5 is a configuration diagram showing the X-axis direction enlarged projection structure of the projection television according to the second embodiment of the present invention. In this embodiment, one double reflecting plate is used.

In the present embodiment, the second light guide plate 30 and the second reflecting plate 40 for enlarging the image light in the Y-axis direction are used in the same manner as compared with the first embodiment described above, while the image light is X- The means for expanding in the axial direction are different. That is, the magnification in the Y-axis direction uses a double reflector as in FIG. 3, but the magnification in the X-axis direction uses a diffuser lens instead of the double reflector consisting of the first light guide plate 10 and the first reflector 20. 50 and the collimated lens 60 are used.

Therefore, in this embodiment, the image generating means 1, the diffusing lens 50 and the collimating lens 60 are arranged in a straight line. The image light projected in parallel by the image generating means 1 is diffused in the X-axis direction by the diffuse lens 50 to be projected onto the collimated lens 60, and the diffused image light is reflected by the collimated lens 60. The light is converted into parallel light and projected onto one side of the second LGP 30.

In the above-described embodiment, the image light is first magnified in the X-axis direction, and then the image light magnified in the X-axis direction is again magnified in the Y-axis direction and projected onto the screen 4, but the order may be changed.

6 is a configuration diagram showing the configuration of a projection television according to a third embodiment of the present invention.

Unlike in FIG. 3, the projection television according to the present embodiment includes three double reflecting plates, that is, three light guide plates and three reflecting plates installed on the rear surface thereof in one-to-one correspondence with each light guide plate.

This projection television of the present embodiment includes image generating means 1, third to fifth light guide plates 100, 300, and 500, and third to fifth reflector plates 200, 400, and 600. FIG.

The third LGP 100 extends the image light incident from the image generating means 1 in the X-axis direction of the screen 4 and emits the light to one side of the fourth LGP 300. Compared to the first LGP 10 of FIG. 3, the third LGP 100 has a tapered shape in which a rear surface thereof is formed to have a predetermined inclination, and the thickness thereof becomes thinner as it moves away from the image generating means 1. The same but the emission direction of the image light is different. That is, although the first light guide plate 10 emits the incident and enlarged light in the Y-axis direction of the screen 4, the third light guide plate 100 is in a direction opposite to the image light emitted from the screen 4 (Z−). Exit in the axial direction).

The third reflector 200 is formed on the rear surface (corresponding to the left side in FIG. 6) of the third light guide plate 100 and is incident on the third light guide plate 100 to be enlarged in the X-axis direction of the screen 4. The light is dual reflected to the Z-axis direction of the screen 4, that is, toward the fourth light guide plate 300.

The fourth LGP 300 extends the image light emitted from the third LGP 100 in the Z-axis direction of the screen 40 and emits the enlarged image light to the fifth LGP 500. The fourth reflector 400 is formed on the rear surface of the fourth LGP 300 to double reflect the image light enlarged in the Z-axis direction from the fourth LGP 300 so that the Y-axis direction of the screen 4 may be the fifth. To face the light guide plate 500.

The fifth light guide plate 500 is formed to be spaced apart from the screen 4 at the rear side of the screen 4, and the image light incident from the fourth light guide plate 300 is enlarged in the Y-axis direction of the screen 4. Projected onto the screen (4). The fifth reflector 600 is formed on the rear surface of the fifth LGP 500 to double reflect the image light incident from the fourth LGP 300 to the screen 4.

The structure and operation principle of the third to fifth reflector plates 200, 400 and 600 are the same as in the above-described embodiment.

7 is a configuration diagram showing the configuration of a projection television according to a fourth embodiment of the present invention, and FIGS. 7A and 7B respectively show the projection television according to the present embodiment as viewed directly from the side and from above.

This embodiment moves the image generating means 1 to the lower right side of the screen 4 in comparison with the first embodiment described above, so that the image light is emitted in the rear direction (Z-axis direction) of the screen 4. The image light exit plane is rotated 90 ° clockwise. That is, in Figs. 2 and 3, the image generating means 1 emits the image light in the lateral direction (X-axis direction) of the screen 4, but in this embodiment, the rear direction (Z-axis direction) of the screen 4 Exit) Then, the light guide plate 700 provided with a reflecting plate 800 on the rear surface for reflecting the image light emitted from the image generating means 1 to the first light guide plate 10 at the position where the image generating means 1 was originally located. Install.

That is, the image light emitted from the image generating means 1 is double reflected by the double reflecting plate 800 so that its traveling direction is turned by 90 ° to be directed to the first light guide plate 10. 7A and 7B, the first LGP 10 and the first reflecting plate 20 are not shown to be covered by other LGPs. The image light magnified and double-reflected by the light guide plate 700 and the reflector 800 is again subjected to the first light guide plate 10, the first reflector 20, and the second light guide plate 30 and the second light guide as in the first embodiment described above. 2 are sequentially magnified and double-reflected in the reflector plate 40 to proceed to the screen (4).

As described above, the projection television of the present invention can significantly reduce the thickness of the projection television by newly improving the reflection structure for the projected image light by using a plurality of light guide plates and reflectors having double reflecting surfaces.

1 is a block diagram showing the structure of a conventional general rear projection type projection television.

2 and 3 each show a reflection structure of the projection television according to the first embodiment of the present invention.

4 is a cross-sectional view showing in more detail the structure of the double reflecting surface in the reflector of FIGS.

Fig. 5 is a block diagram showing an X-axis enlarged projection structure of the projection television according to the second embodiment of the present invention.

6 is a configuration diagram showing the configuration of a projection television according to a third embodiment of the present invention.

7 is a configuration diagram showing the configuration of a projection television according to a fourth embodiment of the present invention.

Claims (7)

Image generating means for projecting image light; A first double reflecting plate for enlarging the image light from the image generating means in a first direction and double reflecting the enlarged image light to emit in a second direction; And And a second reflecting plate comprising a second reflecting plate which expands the image light emitted from the first reflecting plate in the second direction and reflects the enlarged image light in the normal direction of the screen. Image generating means for projecting image light; A first double reflecting plate for enlarging the image light from the image generating means in a first direction and double reflecting the enlarged image light to emit in a second direction; A second double reflecting plate configured to enlarge the image light emitted from the first double reflecting plate in the second direction and to double reflect the enlarged image light to emit in the third direction; And And a third reflecting plate comprising a third reflecting plate which expands the image light emitted from the second reflecting plate in the third direction and reflects the enlarged image light in the normal direction of the screen. Image generating means for projecting image light; A diffusion lens that receives the image light from the image generating means and diffuses it in a first axis direction; A collimated lens for converting the image light diffused by the diffusion lens into parallel light and outputting the parallel light; And And a double reflecting plate comprising a double reflecting plate which expands the image light emitted from the collimating lens in a second direction and double reflects the enlarged image light to the normal direction of the screen. The method of claim 1, wherein each of the double reflector is A light guide plate which transmits the image light incident from the image generating means and expands in the advancing direction thereof; And A reflection plate formed on a rear surface of the light guide plate and having at least one double reflection surface to double reflect the image light enlarged in the light guide plate so that the traveling direction of the double reflected image light is perpendicular to the traveling direction of the incident image light; A projection television having a double reflector, characterized in that it comprises a. The method of claim 4, wherein each of the light guide plate A projection television having a double reflecting plate, characterized in that it is formed in a tapered shape, the thickness of which becomes thinner as it moves away from the plane where the image light is incident. The method of claim 4, wherein the double reflecting surface of each reflecting plate A first reflecting surface which firstly reflects the image light incident through the light guide plate in a direction opposite to the front surface of the light guide plate; And And a second reflecting surface for secondly reflecting the first reflected image light in a direction normal to the front surface of the light guide plate. The method of claim 6, And the reflecting surfaces are formed such that the sum of the incident angle and the reflection angle of the primary reflected light is the sum of the incident angle and the reflection angle of the secondary reflected light to be 90 °. Projection television.