KR20050031842A - Scrolling unit and projection system employing the same - Google Patents

Abstract

A scrolling unit and a projection system employing the same are provided to achieve color scrolling on a single path for a plurality of colors. A scrolling unit includes a stroller(31) and a cylinder lens array(22). The stroller includes plural cylindrical lens for dividing incident light into a plurality of beams. The cylinder lens array(22) is arranged in a vertical to the arrangement direction of the cylindrical lens(22). A fly eye lens is arranged at an outer peripheral surface of the cylinder and rotatably installed. The fly eye lens performs a straight line movement according to the rotation of the scrolling unit. A projection system employing the same includes a light source(10), a color filter(20), a scrolling unit(30), and a light valve(40). The color filter divides colors projected from the light source.

Description

Scrolling unit and projection system employing the same

The present invention relates to a scrolling unit and a projection system used to form a color image by a scrolling action, and more particularly to a column which is capable of performing color scrolling by rotational movement on one light path for a plurality of colors. Type scrolling unit and a projection system employing the same.

The projection system is divided into a three-plate type and a single plate type according to the number of light valves which form an image by controlling the light emitted from the high power lamp light source on-off in units of pixels. Single-panel projection systems can reduce the optical system structure compared to the three-plate type, but the white light is separated into R, G, and B colors by the sequential method. Thus, efforts have been made to increase light efficiency in the case of single-plate projection systems.

In the case of a general single-panel projection optical system, light emitted from a white light source is separated into three colors of R, G, and B colors using a color filter, and each color light is sequentially sent to a light valve. Then, the light valve is operated in this color order to realize an image. As such, the single plate optical system uses colors sequentially, so that the light efficiency is reduced to 1/3 compared to the three plate type. Therefore, efforts have been made to increase the light efficiency in the case of a single-plate projection system, and a scrolling method has been proposed as one of these methods. The color scrolling method separates white light into R, G, and B tricolor lights and simultaneously sends them to different positions of the light valve. In addition, since color image can be realized only when R, G, and B colors reach each pixel, color bars are periodically cycled in a specific manner.

In the conventional single-plate scrolling projection system, as illustrated in FIG. 1A, white light emitted from the light source 100 is first to second through the first and second lens arrays 102 and 104 and the polarization converter 105. Fourth dichroic filters 109, 112, and 139 are separated into R, G, and B tricolor lights. First, for example, the red light R and the green light G are transmitted by the first dichroic filter 109 to proceed to the first optical path L ₁ , and the blue light B is reflected to the second light. The light path L ₂ and the red light R and the green light G traveling in the _first light path L ₁ are separated by the second dichroic filter 112. The red light R is transmitted by the second dichroic filter 112 to continue straight along the _first light path L ₁ , and the green light G is reflected to travel to the third light path L ₃ . .

Rotatable prisms 114, 135, and 142 are disposed on the first to third optical paths L ₁ , L ₂ , and L ₃ , respectively. Light irradiated from the light source 100 is separated into red light (R), green light (G), and blue light (B) and passes through the rotatable first to third prisms 114, 135, and 142 corresponding to the light. While scrolling. As the first to third prisms 114, 135, and 142 are rotated at uniform speeds, three color bars of R, G, and B colors are scrolled. The blue light and the green light traveling along the second and third optical paths L ₂ and L ₃ , respectively, are reflected and transmitted by the third dichroic filter 139, and are finally synthesized. The R, G, and B tricolor light are synthesized by the filter 141 and sent to the light valve 130 by the polarizing beam splitter 127, and a color image is formed by the light valve 130.

A focusing lens 107 is provided next to the polarization converter 105, and lenses 110 and 117 for light path correction are formed on the first to third optical paths L ₁ , L ₂ , and L ₃ . 131, 137, and 145 are provided. In addition, the focusing lens 120 may be disposed between the first dichroic filter 112 and the fourth dichroic filter 141 and between the third dichroic filter 139 and the fourth dichroic filter 141. 140 is disposed, and a focusing lens 124 and a polarizer 125 are disposed on an optical path between the fourth dichroic filter 141 and the polarization beam splitter 127. Optical path converters, for example, reflective mirrors 118 and 133, are further provided on the first optical path L1 and the third optical path L3 to convert the paths of light traveling in the respective paths.

Meanwhile, a process of scrolling the R, G, and B color bars by the rotation of the first to third prisms 114, 135, and 142 is illustrated in FIG. 1B. This shows that the color bars formed on the surface of the light valve 130 are periodically circulated when the first to third prisms 114 and 135 and 142 corresponding to each color are rotated in synchronization. In this manner, when the R, G, and B color bars are cycled once, a color image of one frame is formed.

The light valve 130 processes an image signal for each pixel to form a color image, which is enlarged through a projection lens unit (not shown) and formed on the screen.

A process of scrolling the R, G, and B color bars by the rotation of the first to third prisms 114, 135, and 142 is illustrated in FIG. 1B. This shows that the color bars formed on the surface of the light valve 130 are periodically circulated when the first to third prisms 114 and 135 and 142 corresponding to each color are rotated in synchronization.

Since the projection system having the above structure uses optical paths for each color, each optical path correction lens must be provided for each color, and components for collecting the separated color lights must be provided, and optical parts for each color must be provided. Since the preparation is required separately, the volume of the optical system is increased, and the manufacturing and assembly processes are complicated, so that the yield is low. In addition, noise caused by driving of three motors (not shown) for rotating the first to third prisms 114, 135, and 142 is greatly generated, and compared to a color wheel method in which one motor is provided. The manufacturing cost is increased.

In addition, in order to implement a color image by using a scrolling method, the color bar must be moved at a constant speed as shown in FIG. 1B. In this structure, the synchronization is required between the light valve and the three prisms for scrolling. Is difficult. In addition, since the first to third prisms 114, 135, and 142 each have circular motions, the speed of color scrolling is not constant, and thus image quality may be degraded.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a miniaturized scrolling unit and a projection system employing the same, wherein color scrolling is performed on a single path for a plurality of colors.

In order to achieve the above object, the scrolling unit according to the present invention is a scrolling unit for scrolling incident light,

A rotatable scroller having a plurality of cylindrical lenses dividing the incident light into a plurality of beams in a longitudinal direction on a cylindrical outer circumferential surface; At least one cylinder lens array arranged to be orthogonal to the arrangement direction of the cylindrical lens; and as the scroller rotates, the linear lens is converted into linear movement of the cylindrical lenses in a region through which incident light passes. do.

In order to achieve the above object, the scrolling unit according to the present invention is a scrolling unit for scrolling incident light,

The fly's eye lenses are arranged on the outer circumferential surface of the cylindrical body and are rotatable, so that the fly's eye lenses are converted to linear movement of the fly's eyes in the area where the incident light passes as the scrolling unit rotates.

In order to achieve the above object, a projection system according to the present invention includes a light source; A color filter separating the light emitted from the light source for each color; A rotatable scroller in which a plurality of cylindrical lenses are arranged in a cylindrical shape to scroll the color beams separated by the color filter, and at least one cylinder lens array arranged to be orthogonal to an arrangement direction of the cylindrical lenses. Having a scrolling unit; And a light valve in which light emitted from the light source is separated into colors by the color filter and the scrolling unit, and processed according to an input image signal to form a color image.

In order to achieve the above object, a projection system according to the present invention includes a light source; A color filter separating the light emitted from the light source for each color; A scrolling unit configured to be rotatably formed on the outer circumferential surface of the fly's eye to rotate the incident light; And a light valve in which light emitted from the light source is separated by color through the color filter and the scrolling unit and processed according to an input image signal to form a color image.

The color filter is disposed to be inclined at a predetermined angle and includes first to third dichroic filters selectively transmitting and reflecting an incident beam according to a wavelength.

Hereinafter, a scrolling unit and a projection system employing the same according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The projection system according to the first embodiment of the present invention scrolls the color separated by the light source 10, the color filter 20 separating the light emitted from the light source 10 into a plurality of colors, and the color filter 20. It comprises a scrolling unit 30 to make.

Then, the light passing through the scrolling unit 30 is bound to the light valve 40, and processed according to the image signal input to the light valve 40 to form a color image.

The light source 10 irradiates white light, and includes a lamp 11 for generating light, and a reflector 13 for reflecting the light emitted from the lamp 11 and guiding a progress path thereof. The reflector 13 may be configured as an ellipsoidal mirror having the position of the lamp 11 as one focal point and another point at which the light is focused. Alternatively, the position of the lamp 11 may be a focal point, and the light emitted from the lamp 11 and reflected from the reflector 13 may be configured as a parabolic mirror so as to become a parallel beam. 2 illustrates an example in which an ellipsoidal mirror is used as the reflector 13. On the other hand, when the parabolic mirror is used as the reflector 13, a lens for focusing light should be further provided.

The collimating lens 15 and the first cylinder lens array 17 are provided on the optical path between the light source 10 and the color filter 20 to make incident light into a parallel beam. In the first cylinder lens array 17, a plurality of cylindrical lenses 17a are arranged perpendicularly to the color separation direction (Z direction) of the color filter 20.

The first cylinder lens array 17 divides the beam emitted from the light source 10 by the number of cylinder lenses 17a to be incident on the color filter 20.

The color filter 20 includes first, second and third dichroic filters 20a, 20b and 20c disposed to be inclined at a predetermined angle with respect to the incident optical axis. The color filter 20 separates incident light according to a predetermined wavelength region, and allows the separated light to travel at different angles. The first, second and third dichroic filters 20a, 20b and 20c may be disposed to be inclined at different angles or parallel to each other. 2 illustrates a case where the first to third dichroic filters 20a, 20b, and 20c are disposed in parallel with each other.

For example, the first dichroic filter 20a reflects the beam R in the red wavelength region of the white incident light and transmits the beams G and B in the other wavelength region. The second dichroic filter 20b reflects the beam G of the green wavelength region of the light transmitted through the first dichroic filter 20a and transmits the beam B of the remaining blue wavelength region. . The third dichroic filter 20c reflects the beam B of the blue wavelength region passing through the first and second dichroic filters 20a and 20b. The third dichroic filter 20c may be replaced with a total reflection mirror.

Here, the R, G, and B tricolor beams separated for each wavelength by the first to third dichroic filters 20a, 20b, and 20c are reflected at different angles and incident on the scrolling unit 30. .

The first cylinder lens 22 is provided between the color filter 20 and the scrolling unit 30. The first cylinder lens 22 reduces the width of the cross section of the incident light.

The scrolling unit 30 according to the first embodiment of the present invention includes a scroller 31 formed by arranging a plurality of cylindrical lenses 31a on a cylindrical outer circumferential surface, and orthogonal to the cylindrical lenses 31a. At least one second cylindrical lens array 33, 34 arranged. The second cylindrical lens arrays 33 and 34 are formed by arranging cylindrical lenses 33a and 34a in a flat plate shape, and the cylindrical lenses 33a and 33b are the scrollers 31. Is orthogonal to the arrangement direction of the cylindrical lens 31a.

The scroller 31 is rotatable and the rotational movement of the scroller 31 is linear movement of the cylindrical lenses 31a in the area A through which the beam passes (arrow B in the figure). Direction). As the scroller 31 is rotated, the position of the cylindrical lenses in the area (area A) through which the beam passes changes continuously and periodically. Here, the period of the linear motion can be adjusted by adjusting the width w of the cylindrical lens 31a and the rotational speed of the scroller 31.

The second cylindrical lens array is composed of a pair (33, 34), one of the pair 33 is disposed inside or in front of the scroller 31, the other 34 is the scroller It can be placed after 31.

The cylindrical lens 31a of the scroller 31 is arranged along the color separation direction (Z direction) by the color filter 20, and the cylinders of the second cylindrical lens arrays 33 and 34 are arranged. The curl lenses 33a and 34a are disposed to be orthogonal to the cylindrical lenses 31a.

A second cylinder lens 35 corresponding to the first cylinder lens 22 and a relay lens 37 are disposed between the scroller 31 and the light valve 40.

Next, the effect of the projection system configured as described above will be described.

The light emitted from the light source 10 becomes a parallel beam by the collimating lens 15 and is incident on the first cylinder lens array 17. The first cylinder lens array 17 is composed of a plurality of cylindrical lenses 17a, and the beams passing through the first cylinder lens array 17 are separated by the number of cylindrical lenses 17a and the color filter. It enters into (20).

In the color filter 20, incident beams are separated by colors, for example, first, second, and third color beams. When beams separated by the first, second and third colors are incident on the scroller 31, they are formed in the first, second and third color arrays for each cylindrical lens 31a of the scroller 31. . That is, the first, second and third color arrays are formed for each cylindrical lens 31a. Here, when the number of the cylindrical lenses 17a of the first cylinder lens array 17 is four, the color array is formed on the four cylindrical lenses 31a in the scroller 31 as well.

When the beam is incident on the scroller 31, the cross-sectional width of the incident beam is reduced by the first cylinder lens 22, and the beam passing through the scroller 31 is incident on the second cylinder lens 35. It becomes a parallel beam and focuses in the same state as before the width was reduced.

The pair of second cylinder lens arrays 33 and 34 and the relay lens 37 are formed in different areas of the light valve 40 according to the color when the color array is formed on the light valve 40. The color bars are scrolled in accordance with the rotation of the scroller 31 to form a color image.

 Next, a modification of the projection system according to the first embodiment of the present invention is shown in FIG. Compared with the projection system shown in FIG. 2, there is a difference in that the structure of the color filter and the arrangement of the optical components are changed. Here, the components of FIG. 4 using the same reference numerals as those shown in FIG. 2 have the same functions and functions, and detailed description thereof will be omitted herein.

Referring to FIG. 4, the color filter 21 includes first, second and third dichroic filters 21a, 21b and 21c, and the first, second and third dichroic filters. (21a) (21b) and 21c are arrange | positioned at different angles.

The beam emitted from the light source 10 becomes a parallel beam by the collimating lens 15 and is incident on the color filter 21. The first cylindrical lens array 16 is disposed after the color filter 21. The color beams separated by the color filter 21 are formed in a color array on each cylindrical lens 16a of the first cylindrical lens array 16.

The first cylinder lens 22 reduces the width of the cross section of the beam passing through the first cylindrical lens array 16 so that the first cylinder lens 22 is incident on the scroller 31, and the second cylinder lens 35 has the reduced width. To restore the original function.

Meanwhile, a third cylindrical lens array 23 is further disposed on the optical path between the first cylinder lens 22 and the scroller 31. In the third cylindrical lens array 23, the cylindrical lens is arranged in parallel with the arrangement direction of the cylindrical lens 31a of the scroller 31. In addition, it is preferable that the cylindrical lens be arranged in a curved shape like the scroller 31.

The beams passing through the scrollers 31, the second cylindrical lens arrays 33 and 34, and the relay lenses 37 are formed in the light valve 40 in different areas for each color, thereby forming color bars. As the scroller 31 rotates, the color bars are scrolled and processed according to the image information input to the light valve 40 to form a color image.

Next, referring to FIG. 5, the projection system according to the second exemplary embodiment of the present invention includes a light source 10, a color filter 20 for separating light emitted from the light source 10 into a plurality of colors, and a color filter 20. And a scrolling unit 50 for scrolling the color separated by.

Then, the beam passing through the scrolling unit 50 forms a light valve 40 and is processed according to the image signal input to the light valve 40 to form a color image.

The collimating lens 15 and the cylindrical lens array 17 are arranged on the optical path between the light source 10 and the color filter 20 to make the incident beam parallel.

The scrolling unit 50 is formed with a fly's eye lens 50a arranged on a cylindrical outer circumferential surface. The fly's eye lens 50a has negative power in a direction orthogonal to the rotational direction of the scrolling unit 50 (x direction), and has a positive power in a direction parallel to the rotational direction.

The first cylinder lens 22 is disposed on the optical path between the color filter 20 and the scrolling unit 50, and the second cylinder lens is disposed on the optical path between the scrolling unit 50 and the light valve 40. 35 and a relay lens 37 are provided.

The color filter 20 includes first, second and third dichroic filters 20a, 20b and 20c, and the first, second and third dichroic filters 20a and 20b. ) 20c are arranged in parallel with each other.

In FIG. 5, members having the same reference numerals as those shown in FIG. 2 have substantially the same functions and functions, and detailed description thereof will be omitted.

In the second embodiment of the present invention, the scrolling unit 50 is composed of a fly's eye lens 50a. In comparison with the second embodiment and the first embodiment, the second embodiment is distinguished in that the second cylindrical lens arrays 33 and 34 shown in Fig. 2 are not separately required.

In the projection system according to the second embodiment, the beam emitted from the light source 10 becomes a parallel beam by the collimating lens 15 and is incident on the first cylindrical lens array 17 and the first cylindrical dribble. The beam separated for each of the cylindrical lenses 17a by the lens array 17 is separated by the color filter 20 into a plurality of color beams according to the color.

In addition, the plurality of color beams are formed as color bars on the light valve 40 through the scrolling unit 50 and the relay lens 37. This color bar is scrolled as the scrolling unit 50 is rotated to form a color image.

In the second embodiment, the scrolling unit 50 not only scrolls the color bar but also forms the color bar, thereby reducing the number of parts.

Next, Fig. 6 shows a projection system according to a modification of the second embodiment of the present invention.

This projection system includes a light source 10, a collimating lens 15, a color filter 55, a scrolling unit 50, and a light valve 40.

The color filter 55 includes first, second and third dichroic filters 55a, 55b and 55c, and first, second and third dichroic filters 55a and 55b. 55c are arranged to be inclined at different angles.

In the scrolling unit 50, the fly's eye lens 50a is arranged in a cylindrical shape as described with reference to FIG. 5.

The first cylindrical lens array 56, the first cylindrical lens 22, and the third cylindrical lens array 23 are provided on the optical path between the color filter 55 and the scrolling unit 50. In addition, a second cylinder lens 35 and a relay lens 37 are provided on the optical path between the scrolling unit 50 and the light valve 40.

The third cylindrical lens array 23 is preferably formed in a curved shape as the scrolling unit 50.

The beam emitted from the light source 10 is divided into a plurality of color beams by the color filter 55, and the separated beam is each cylindrical lens 56a of the first cylindrical lens array 56. Each is tied into a color array. The color array is formed as a color bar by the scrolling unit 50 and the relay lens 37 and is attached to the light valve 40.

As described above, it is possible to easily form a color image while reducing the number of parts of the projection system.

The scrolling unit according to the present invention can control the color beams at the same speed by scrolling the plurality of color beams in a single path and scrolling all the color beams to be used in one scrolling unit.

Further, the projection system according to the present invention is simple in structure and miniaturized because a plurality of cylindrical lenses or fly's eye lenses are scrolled on a single path for all colors using a rotatable scrolling unit arranged in a cylindrical longitudinal direction. It is. In addition, since one scrolling unit is scrolled at the same speed for all colors to be used, synchronous control of image signal processing is easy, and thus image quality can be improved.

In addition, the structure of the scrolling unit may be improved to reduce the number of parts of the projection system and to reduce the production cost.

1A is a schematic diagram of a conventional projection system.

1B is a view for explaining a color scrolling method in a conventional projection system.

2 is a perspective view of a projection system according to a first embodiment of the present invention.

3 is a view for explaining the scrolling action of the scrolling unit employed in the projection system according to the first embodiment of the present invention.

4 is a modification of the projection system according to the first embodiment of the present invention.

5 is a perspective view of a projection system according to a second embodiment of the present invention.

6 is a modification of the projection system according to the second embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

10 ... light source, 15 ... collimating lens

16,17,33,34 Cylindrical lens array, 20 Color filter

22,35 ... cylinder lens, 30,50 ... scrolling unit

31 ... scroller, 37 ... relay lens

40 ... light valve

Claims (9)

A scrolling unit for scrolling incident light, A rotatable scroller having a plurality of cylindrical lenses dividing the incident light into a plurality of beams in a longitudinal direction on a cylindrical outer circumferential surface; At least one cylinder lens array arranged to be orthogonal to the arrangement direction of the cylindrical lens; and as the scroller rotates, the linear lens is converted into linear movement of the cylindrical lenses in a region through which incident light passes. Scrolling unit. A scrolling unit for scrolling incident light, The fly's eye lens is arranged on the outer peripheral surface of the cylindrical form and is rotatable, so that the scrolling unit is rotated by the linear movement of the fly's eye lenses in the area through which the incident light passes. Light source; A color filter separating the light emitted from the light source for each color; A rotatable scroller in which a plurality of cylindrical lenses are arranged in a cylindrical shape to scroll the color beams separated by the color filter, and at least one cylinder lens array arranged to be orthogonal to an arrangement direction of the cylindrical lenses. Having a scrolling unit; And a light valve in which the light irradiated from the light source is separated and formed by colors through the color filter and the scrolling unit, and processed according to the input image signal to form a color image. Light source; A color filter separating the light emitted from the light source for each color; A scrolling unit configured to be rotatably formed on the outer circumferential surface of the fly's eye to rotate the incident light; And a light valve in which the light irradiated from the light source is separated and formed by colors through the color filter and the scrolling unit, and processed according to the input image signal to form a color image. The method according to claim 3 or 4, The color filter is a projection system characterized in that it comprises a first to third dichroic filter disposed to be inclined at a predetermined angle to selectively transmit and reflect the incident beam according to the wavelength. The method of claim 5, The first to third dichroic filters are arranged parallel to each other. The method of claim 5, The first to third dichroic filters are arranged inclined at different angles. The method according to claim 3 or 4, And a first cylinder lens for reducing the width of the light incident on the scrolling unit in front of the scrolling unit, and a second cylinder lens for parallelizing the light passing through the scrolling unit behind the scrolling unit. . The method according to claim 3 or 4, And a relay lens on an optical path between the scrolling unit and the light valve.