KR100763021B1 - Projection TV having reflect plate having dual reflect surface - Google Patents

Abstract

The present invention discloses a projection television using a refractive reflector.

The projection television of the present invention comprises image generating means for projecting image light; A first refraction reflecting plate which receives the image light emitted from the image generating means and refracts and reflects the image light to emit in the first direction; And a second refraction reflector that receives the image light emitted from the first refraction reflector, and refracts and reflects the image light to exit the normal light direction of the screen. By enlarging the image while making it easily bent at 90 °, the thickness of the projection television can be significantly reduced.

Description

Projection TV having a reflective reflector {projection TV having reflect plate having dual reflect surface}

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 reflection structure that refracts and enlarges and reflects image light using a refractive reflector.

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 using the refractive reflector of the present invention for achieving the above object is an image generating means for projecting image light; A first refraction reflecting plate which receives the image light emitted from the image generating means and refracts and reflects the image light to emit in the first direction; And a second refraction reflecting plate which receives the image light emitted from the first refraction reflecting plate and refracts and reflects the image light to emit in the normal direction of the screen.

A projection television using a refractive reflector according to another embodiment of the present invention includes image generating means for projecting image light; A third refracting reflector receiving the image light emitted from the image generating means and refracting and reflecting the image light to emit in the first direction; A fourth refraction reflecting plate which receives the image light emitted from the third refraction reflecting plate and refracts and reflects it to emit in the second direction; And a fifth refracting reflector for receiving the image light emitted from the fourth refracting reflector, and refracting and reflecting the image light to emit in the normal direction of the screen.

According to another embodiment of the present invention, a projection television using a refractive reflector includes image generating means for projecting image light; A diffusion lens that receives the image light emitted 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 refraction reflecting plate which receives the image light emitted from the collimating lens and refracts and reflects the image light to emit in the normal direction of the screen.

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

2 and 3 are cross-sectional views showing the X-axis direction enlarged projection structure and the Y-axis direction enlarged projection structure, respectively, of the projection television according to the first embodiment of the present invention.

The projection television according to the present embodiment includes an image generating means 1, a first refractive reflector 10, and a second refractive reflector 20. 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 refraction reflector 10 is a medium having a constant refractive index, and has a tapered shape in which the thickness is changed at a predetermined angle, and at the refraction surface 12 and the refraction surface 12 for transmitting the image light projected by the image generating means 1. It has a reflecting surface 14 which reflects refracted image light. The first refraction reflector 10 refracts and reflects the image light incident in parallel from the image generating means 1 so that the image light from the image generating means 1 is bent at 90 ° with respect to the advancing direction of the second light. It proceeds to the refractive reflector 10. That is, the image light emitted from the image generating means 1 travels in the air and enters the first refractive reflector 10 through the refractive surface 12. At this time, the refractive index of the first refractive reflector 10 ) Is different from the refractive index of air ("1"), the incident image light is transmitted through the refractive surface 12 while the refractive index of the first refractive reflector 10 as shown in FIG. ) Is refracted at an angle and proceeds toward the reflective surface 14. The image light refracted by the refracting surface 12 is reflected at an angle equal to the angle incident on the reflective surface 14, and then refracted by the refracting surface 12 to proceed to the second refracting reflector 20. By this refraction and reflection action, the image light traveling to the second refraction reflector 20 is bent at 90 ° to the image light incident on the first refraction reflector 10. In addition, the image light is not only bent at a 90 ° direction, but also the image is enlarged in the X-axis direction of the screen 4 when it is refracted by the first refraction reflector 10, whereby the first refraction reflector 10 also has a function of enlarging the image. As the refractive reflector 10, a transparent medium such as glass, acrylic, diamond, or the like may be used. A reflective material may be coated behind the reflector 14 to increase reflectance.

Like the first refractive reflection plate 10, the second refractive reflection plate 20 also has a constant refractive index, one surface of which consists of a refractive surface 22 that transmits incident image light, and the other surface of the second reflection reflection plate 20 passes through the refractive surface 22. It is made of a tapered medium having a reflective surface 24 for reflecting the light. The second refraction reflector 20 refracts and reflects the image light refracted and reflected by the first refraction reflector 10 so that the image light is emitted at a 90 ° angle to the incident direction so that the image light is normal to the screen 4. Direction (Z-axis direction). The refraction and reflection in the second refracting plate 20 are the same as in the first refracting plate 10, but only in the direction of the image light incident on the second refracting plate 20 and emitted from the second refracting plate 20. Only the direction of the image light is different from that in the first refraction reflector 10. In the second refraction reflector 20, the image is refracted to enlarge the image, and in the second refraction reflector 20, the image is enlarged in the Y-axis direction of the screen 4. Therefore, the image light emitted from the image generating means 1 is sequentially enlarged in the X-axis and Y-axis directions by the first refractive reflector 10 and the second refractive reflector 20, so that the image generating means 1 An image larger than the image light emitted from the image is displayed through the screen 4.

4 is a view illustrating in detail the relationship between the refractive reflection plate and the image light according to the configuration of the reflection reflection plate of FIGS. 2 and 3 and the refractive index of the reflection reflection plate. In FIG. 4, only the first reflection reflection plate 10 will be described.

When the image light from the image generating means 10 enters the refractive surface 12 of the first refractive reflector 10 after traveling in air, the refractive index of the first refractive reflector 10 Since) is different from air, the image light is refracted at an angle while passing through the refracting surface 12 and bent toward the reflecting surface 14. At this time, the angle of incidence, that is, the angle between the refracting surface 12 of the first refraction reflector 10 and the image light incident from the outside is formed. The angle formed by the normal of the refracting surface 12 and the image light refracted by the refracting surface 12 is defined as In this case, the incident angle in the refractive reflector 10 And refraction angle Is satisfied with the equation (1).

On the refractive surface 12 The image light curved at an angle of is reflected by the reflective surface 14 at the same angle and then directed to the refractive surface 12. The image light reflected by the reflecting surface 14 is refracted by the refracting surface 12 and exits vertically downward. At this time, the angle formed by the normal of the image light and the refracting surface 12 reflected from the reflective surface 14 of the first refractive reflector 10 And the angle formed by the image light incident from the image generating means 1 and the reflecting surface 14 In other words, the angle of incidence Refraction angle , And the refractive index of the first refractive reflector 10 Satisfies Equation 2.

Using Equations 1 and 2, the image light incident on the refraction reflecting plate 10 is refracted and reflected by the refraction reflecting plate 10, so that the traveling direction is radiated to be 90 ° or nearly 90 °. The conditions for doing so can be calculated | required. That is, for refraction of the refracting surface 12 after being reflected by the reflective surface 14 so that the refracted angle is equal to the angle between the image light incident from the outside and the refracting surface 12, , You can see the relationship.

5 is a refractive index as an embodiment of the present invention In the case where this 1.5 medium is used as the refraction reflector, angles formed by the image light and the refraction surface 12 and the reflection surface 14 of the first refraction reflection plate 10 are made. , It is a figure which shows the relationship of.

In the above-described embodiment, only the first refraction reflecting plate 10 has been described. However, in the second refraction reflecting plate 20, only the direction of the incident image light is different from the direction of the refracting and reflected image light. The same as in the refractive reflection plate 10.

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

This embodiment uses the diffusing lens 30 and the collimating lens 40 instead of the first refractive reflector 10 as compared with the first embodiment described above.

The diffusion lens 30 extends the image light from the image generating means 1 in the X-axis direction of the screen 4, and the collimated lens 40 is diffused by the diffusion lens 30 in the X-axis direction. The image light diffused into the light is converted into parallel light and emitted to the second refractive reflector 20. That is, the image generating means 1, the diffusing lens 30 and the collimating lens 40 are arranged in a straight line under the second refractive reflector 20, and the image light emitted from the image generating means 1 in parallel. Is first enlarged in the X-axis direction using the lenses 30 and 40 and then emitted to the second refractive reflector 20.

In the above-described embodiment, the image light is first enlarged in the X-axis direction, and then the image light enlarged in the X-axis direction is incident on the second refraction reflector 20, and then enlarged in the Y-axis direction to the screen 4. It is supposed to be projected, but the order can be changed. That is, the lens may be first enlarged in the Y-axis direction and then refracted and reflected.

FIG. 7 is a block diagram showing the configuration of a projection television according to a third embodiment of the present invention. In the projection television according to the present embodiment, unlike FIG. 2 and FIG.

This projection television of this embodiment includes an image generating means 1 and third to fifth refractive reflector plates 50, 60, 70. FIG.

The third refracting reflector 50 refracts and reflects the image light incident from the image generating means 1 to enlarge the image in the X-axis direction while the traveling direction thereof is turned 90 ° to proceed to the fourth refracting reflector 60 side. To make it possible. The third refracting reflector 50 has the same taper shape as the first refracting reflector 10 of FIG. 3, but the emission direction of the image light is different. That is, although the first refraction reflector 10 emits the incident image light in the Y-axis direction of the screen 4, the third refraction reflector 50 is in a direction opposite to the image light emitted from the screen 4 (Z). -Axis exit).

The fourth refracting reflector 60 refracts and reflects the image light refracted and reflected by the third refracting reflector 50 and exits toward the Y-axis direction of the screen 4, that is, the fifth refracting reflector 60. At this time, the image light is enlarged in the Z-axis direction of the screen 4 by the refraction of the fourth refraction reflector 60.

The fifth refracting reflector 70 is formed on the rear side of the screen 4, and refracts and reflects the image light incident from the fourth refracting reflector 60 toward the screen 4 in the normal direction of the screen 4. Exit. At this time, the image light is enlarged in the Y-axis direction of the screen 4 by the refraction of the fifth refraction reflector 70.

The structure and operation principle of the third to fifth refractive reflector 50, 60, 70 are the same as in the above-described embodiment.

8 is a configuration diagram showing the configuration of a projection television according to a fourth embodiment of the present invention, and FIGS. 8A and 8B show a side view of the projection television according to the present embodiment, as viewed directly from above.

This embodiment shows another embodiment using three refractive plates.

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) And a sixth refracting reflector 80 for reflecting the image light emitted from the image generating means 1 to the first refracting reflector 10 at the position where the image generating means 1 was originally located.

That is, the image light emitted from the image generating means 1 is refracted and reflected by the sixth refracting reflector 80 and its traveling direction is turned 90 ° to be directed to the first refracting reflector 10. 8A and 8B, the first refractive reflector 10 is not shown covered by another refractive reflector. The image light refracted and reflected by the sixth refraction reflector 80 is sequentially refracted and reflected by the first refraction reflector 10 and the second refraction reflector 20 as in the first embodiment described above, so that the screen 4 Proceed to).

In the above-described embodiment, all of the refractive reflectors used in the projection television may be made of the same medium or different media for each of the refractive reflectors according to the user's design.

As described above, the projection television of the present invention refracts and reflects the image light to make it easy to bend 90 ° even in a narrow space, and to the projected image light by using a refraction reflector that can enlarge the image. By improving the reflective structure, the thickness of the projection television can be greatly reduced.

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

2 and 3 are cross-sectional views each showing an X-axis direction projection structure and a Y-axis direction projection structure of the projection television according to the first embodiment of the present invention.

4 is a view showing in more detail the relationship between the refractive reflector and the image light according to the configuration of the refractive reflector of Figures 2 and 3 and the refractive index of the refractive reflector.

5 is a refractive index as an embodiment of the present invention In the case where this 1.5 medium is used as the refraction reflector, angles formed by the image light and the refraction surface 12 and the reflection surface 14 of the first refraction reflection plate 10 are made. , A diagram showing the relationship of.

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

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

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

Claims (6)

Image generating means for projecting image light; A first refraction reflecting plate which receives the image light emitted from the image generating means and refracts and reflects the image light to emit in the first direction; And And a second refracting reflector comprising a second refracting reflector for receiving image light emitted from the first refracting reflector and refracting and reflecting the light. Image generating means for projecting image light; A third refracting reflector receiving the image light emitted from the image generating means and refracting and reflecting the image light to emit in the first direction; A fourth refraction reflecting plate which receives the image light emitted from the third refraction reflecting plate and refracts and reflects it to emit in the second direction; And And a fifth reflective reflector for receiving the image light emitted from the fourth reflective reflector and receiving and refracting and reflecting the image light. Image generating means for projecting image light; A diffusion lens that receives the image light emitted 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 refraction reflecting plate having a refraction reflecting plate which receives the image light emitted from the collimating lens, refracts and reflects the light, and emits the light in the normal direction of the screen. The method of claim 1, wherein the refractive reflector is A projection television using a refractive reflector, characterized in that it has a tapered shape whose thickness is changed at a predetermined angle. The method of claim 4, wherein the refractive reflector is A refractive surface for transmitting incident image light; And And a reflective surface for reflecting the image light transmitted through the refractive surface and advancing back to the refractive surface. The method of claim 5, wherein the refractive reflector is And a refraction angle refracted upon passing through the refraction surface after being reflected by the reflective surface is equal to an angle between the image light incident from the outside and the refraction surface.