KR100526651B1 - System including Color Wheel for Displaying Color Image and Method thereof - Google Patents

Abstract

Disclosed are an image display system including a color wheel and a method thereof. The image display system including the color wheel receives white light from a light source, and separates the first, second, and third light beams corresponding to the first, second, and third colors, respectively. And a light beam separation device for each color that sequentially alternates the optical paths of the third light beams. A signal processing device for separating a first video signal input from the outside into a video signal for each color and generating a predetermined second video signal by synchronizing the video signal for each color with an optical path that alternates sequentially; Including a small display device for outputting the first, second, and third light rays corresponding to the second image signal, it is possible to maximize the efficiency of the light used and to simplify the configuration.

Description

System including color wheel for displaying color image and method

The present invention relates to an image display system, and more particularly, to an image display including a beam separation device for each color using a color wheel that separates white light into light rays having a plurality of colors and sequentially changes the path of output light rays. A system and method thereof are provided.

1 is a configuration diagram for explaining the principle of a general video display system.

As illustrated, the white light generated by the lamp 100 generating white light is incident on the small display device 130 through the illumination lens 120. As a small display device, a liquid crystal thin film (LCD) is mainly used. The image signal 140 supplied from a TV, a personal computer (PC), video, or the like forms an image on the small display device 130 through signal processing in the image signal processor 150. The formed image forms an image on the projection screen 170 far away through the projection lens 160.

The small display device 130 has the configuration as shown in FIG. 2.

The small display device 130 has the number of pixels H and 280 corresponding to the horizontal resolution in the horizontal direction and the number of pixels V and 290 corresponding to the vertical resolution in the vertical direction. When the area of the small display device 130 is enlarged (magnification area 250), one device 210 includes a red pixel 220, a green pixel 230, and a blue pixel 24. Accordingly, the white light incident on each pixel has a specific color according to the transmittance of each pixel controlled by the image signal processor.

In order to display a color image using the small display device, an original image 390 is divided into three basic colors, that is, a red image 310, a green image 330, and a blue image 350 as shown in FIG. 3. The original image 390 is obtained by spatially combining 370 by applying an image corresponding to each basic color to the corresponding color pixel of FIG. 2. However, in this method, since only one third of the entire display area is used for a specific color, it is disadvantageous in terms of resolution and brightness. That is, in the case of the image filled with red, only the red pixel 220 is turned on and the remaining green pixels 230 and the blue pixel 240 are not used, so only one third of all pixels are used.

In order to eliminate the problem, a method of combining images of each basic color in the time domain is used as shown in FIG. 4. In FIG. 4, the basic color-specific images 410, 430, and 450 separated in the same manner as in FIG. 3 are sequentially displayed according to the flow of time 470. In this case, one color is displayed according to the averaging of human visual function. The image 490 is recognized.

A configuration of a conventional video display system for implementing the method will be described with reference to FIG.

White light emitted from the lamp 510 is incident on the small display device 590 through the focusing lens 580 through the illumination lens 520 and through the color beam splitter 530.

The image signal 540 input from the outside is displayed as an image on the small display device 590 via the image signal processor 550. The image signal processor 550 sequentially outputs the image of each basic color as shown in FIG. 4 through the input image signal 540 through signal processing.

The small display device 590 used in this manner is configured as a reflection type. The light reflected by the small display device 590 forms an image on the projection screen 570 via the projection lens 560.

Figure 6 shows a color wheel mainly used as a color-specific light splitting device.

The color wheel 530 is a disc including a green transparent region 610, a blue transparent region 630, and a red transparent region 650. A rotating motor 650 is attached to the rear surface of the color wheel 530 to rotate the color wheel 530.

The operating principle of separating the color of the white light in the color-specific light beam splitting apparatus will be described with reference to FIG. 7. The light beam having the same color as the area 730 where the white light 710 incident through the illumination lens meets the color wheel 530. Only 740 is transmitted and the remaining light rays 720 are reflected. The transmitted light ray 740 is incident on the small display device 760 through the focusing lens 750. Therefore, as the color wheel 530 rotates at a constant speed, light rays of three colors are incident on the small display device 760 at regular intervals.

8 is a diagram illustrating a method of synchronizing a conventional basic color image with an image signal output from an image processing circuit.

As the color wheel rotates at a constant speed, light rays enter the small display device in the order of red, green, and blue, and the red region 810, the green region 820, and the blue region 830 sequentially become the small display apparatus. Is displayed.

The red image 850 is displayed on the projection screen 570 of FIG. 5 in the red region 810 where the red light is incident on the small display device. In the same manner, the green image 860 and the blue image 870 are sequentially displayed on the projection screen 570, and are recognized as the original color image according to the averaging of human beings. In this method, since only one color image is output at a specific time, it is not necessary to divide one pixel into three color pixels in a small display device (see FIG. 2), and thus the use efficiency of the display area is higher than that shown in FIG. 2. .

However, there is a problem that the light utilization efficiency is still low in the method using a color wheel for the conventional color separation shown in FIG. For example, when the white light incident on the color wheel of FIG. 7 passes through the red region of the color wheel, only the red light is transmitted and used for the screen display, and the blue and green light are not reflected. That is, when the energy distribution of each color is the same in white light, only one third of the total light beams are used. The same happens in the green and blue areas of the color wheels.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an image display system and method for solving the problem of low light utilization efficiency.

According to a first aspect of the present invention for achieving the above object, an image display system receives white light from a light source and separates the light into first, second, and third rays corresponding to the first, second, and third colors. A color-specific ray separation device for sequentially alternating optical paths of the first, second, and third light beams; Separating the first image signal input from the outside into a color-specific image signal and sequentially altering the color-specific image signal A signal processing device for generating a second predetermined video signal in synchronization with an optical path to be made; And a small display device for outputting the first, second, and third light beams in response to the second video signal, wherein the color-specific light beam splitting device receives the white light, An inner region having a first collar passing through and reflecting second and third light rays; And an outer region having a second collar that receives the second and third rays diffracted by the reflector to pass the second rays and reflects the third rays, wherein the inner region and the outer region are discs. A color wheel formed by separating radially into at least two regions, dividing the disc into a predetermined center angle and rotating the center point of the disc; A reflector for changing the light path of the light beam reflected from the inner region of the color wheel to be parallel to the incident path of the white light so as to be incident on a predetermined layer of the color bar; And a stacked waveguide so that the first, second, and third light beams propagated from the color wheel are individually incident, wherein the stacked upper bars are longer than the lower bars, and one side of the top bar is formed of the incident light beams. The inclined surface has a predetermined slope to change an optical path, and the inclined surface includes a color bar coated with a reflection medium, and the signal processing device converts the first image signal into a digital signal, and the small display device. A video signal processor for adjusting the size of the image to correspond to the size of, and to adjust the brightness of the image; Separate the first image signal output from the video signal processor into a color-specific image to form a frame for each color; A color signal separator for dividing the color-specific frames of the predetermined number; the color-specific frames each divided into a predetermined number A frame buffer for storing; buffer mixer in response to a beam position signal received from the specific color light separation unit for selecting an area of the color frame-by-frame for each color; And an output frame buffer for combining and storing the color area selected by the buffer mixer.

An image display system according to a second aspect of the present invention for achieving the above object, receives the white light from the light source and is separated into first, second, and third light rays corresponding to the first, second, and third colors. A color-specific ray separation device for sequentially alternating optical paths of the first, second, and third light beams; Separating the first image signal input from the outside into a color-specific image signal and sequentially altering the color-specific image signal A signal processing device for generating a second predetermined video signal in synchronization with an optical path to be made; And a small display device for outputting the first, second, and third light beams in response to the second video signal, wherein the color-specific light beam splitting device receives the white light, An inner region having a first collar passing through and reflecting second and third light rays; And an outer region having a second collar that receives the second and third rays diffracted by the reflector to pass the second rays and reflects the third rays, wherein the inner region and the outer region are discs. A color wheel formed by separating radially into at least two regions, dividing the disc into a predetermined center angle and rotating the center point of the disc; A motor for rotating the color wheel at a constant speed; a reflecting plate configured to change an optical path of the light beam reflected from an inner region of the color wheel to be parallel to an incident path of the white light to be incident on a predetermined layer of the color bar; And a stacked waveguide so that the first, second, and third light beams propagated from the color wheel are individually incident, wherein the stacked upper bars are longer than the lower bars, and one side of the top bar is formed of the incident light beams. The inclined surface includes a color bar that is applied with a reflective medium to have a predetermined slope to change the light path.

An image display system according to a third aspect of the present invention for achieving the above object, receives the white light from the light source and is separated into first, second, and third light rays corresponding to the first, second, and third colors. A color-specific ray separation device for sequentially alternating optical paths of the first, second, and third light beams; Separating the first image signal input from the outside into a color-specific image signal and sequentially altering the color-specific image signal A signal processing device for generating a second predetermined video signal in synchronization with an optical path to be made; And a small display device for outputting the first, second, and third light rays corresponding to the second video signal, wherein the signal processing device converts the first video signal into a digital signal. A video signal processor configured to adjust an image size so as to correspond to a size of the small display device, and to adjust brightness of the image; separating a first image signal output from the video signal processor into a color-specific image to color-specific frames A color signal separator for dividing each of said color-specific frames into a predetermined number; a frame buffer for storing said color-specific frames each equally divided into a predetermined number; A buffer mixer for selecting one area of the frame for each color by color in response to a position signal; And an output frame buffer for combining and storing the region for each color selected by the buffer mixer. According to a fourth aspect of the present invention, there is provided a method including (A) a color wheel that receives white light. Passing a first light beam having the same color as an inner region of the light bar, and reflecting the second and third light beams; (B) receiving the second and third light beams diffracted by a reflecting plate to receive the color; Passing through the second light beam having the same color as the second area of the wheel to input the color bar and reflecting a third light beam; (C) the third light beam is input to the color bar and is inclined by the inclined surface of the color bar. Diffracting a path parallel to the first and second rays; And (D) rotating the color wheel at a predetermined constant speed so that the optical paths of the first, second, and third light beams are alternately sequentially. (E) The first image signal input from the outside is color-coded image signal. Generating a predetermined second video signal by synchronizing with each other and synchronizing the video signals for each color in sequence according to the optical paths that are alternately arranged; And (F) outputting the first, second, and third light rays corresponding to the second image signal.

Therefore, according to this invention, light utilization efficiency can be improved significantly.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

9 is a diagram illustrating a video display system according to an embodiment of the present invention, and FIG. 19 is a flowchart illustrating a video display method according to an embodiment of the present invention.

Referring to FIG. 9, the image display system includes a light source 900 having a lamp 905 and a reflector 907, a light beam separating device 930 for each color, a focusing lens 940, a small display device 960, And an image signal processor 970, a projection lens 980, and a projection screen 990.

The light source 900 emits white light 1000 (S1910).

The reflector is installed at a predetermined position opposite to the light propagation direction so that the emitted white light 1000 propagates along the optical path. The optical path is determined by various optical elements of the image display system. The light element includes an illumination lens 920, a color-specific light splitter 930, a focusing lens 940, a small display device 960, a prism 950, and a projection lens 980.

The white light 1000 is focused by an illumination lens 920 that forms an illumination light through a heat shield filter 910 that blocks the lamp heat of the light source 900, and thus the color of the color beam splitter 930. It enters into a wheel (S1920).

The color beam splitter 930 includes a color wheel for separating colors, a motor for rotating the color wheel, a reflector for changing the direction of light reflected from the color wheel, and a color bar. .

Each of the separated light beams emitted from the color beam splitter 930 is focused on the focusing lens 940, and the path of the light beams is changed by the prism 950 to be incident on the small display device 960 (S1930). .

By the incident light rays, the operation region of the small display device 960 is divided into equal number of basic colors to display light rays for each color. At this time, as the color wheel of the color beam splitter 930 rotates, the optical paths of color beams incident on the small display device 960 alternately as shown in FIG. 14 (from top to bottom). In step S1940, the display unit 110 displays the small display device 960 in a predetermined order.

In addition, the image signal processing unit 970 interlocked with the color beam splitter 930 processes the video image signal 975 input from the outside and transmits the video image signal 975 to the small display device 960. In more detail, the image signal processing unit 970 receives an image signal input from an external device such as a PC, a DVD, a video, and processes the received image signal.

In addition, as the color wheel rotates, the optical path of the light beam for each color output from the color bar is changed, so that the motor rotating at constant speed generates the optical path position signal 935 whenever the optical path is changed, thereby causing the image signal processor 970 to rotate. (S1950).

The image signal processing unit 970 receiving the optical path position signal 935 is divided into equal parts corresponding to sequentially alternating basic colors (RGB) incident from the color beam splitter 930 to the small display device 960. When the video signal is transmitted to the region (see FIG. 14), that is, synchronization may be performed (S1960, S1970, S1980). Steps S1960, S1970, and S1980 will be described in detail with reference to FIG. 15 below.

The synchronized image data and the basic color image are reflected or propagated to the projection screen 990 through the projection lens 980 (S1990).

FIG. 10 is a detailed configuration diagram of a color beam splitter of FIG. 9.

The color beam splitter 930 receives the white light 1000, and splits the white light 1000 into first, second, and third light beams 1010, 1030, and 1050. The colors of the first, second, and third rays 1010, 1030, and 1050 are blue, red, and green, respectively.

The white light 1000 incident on the color beam splitter 930 is first incident on the color wheel 1100. The color wheel 1100 is formed by thinly applying an RGB color to circular glass. The motor 1150 mounted on the rear surface of the color wheel 1100 rotates at the same speed with the same rotation axis as the color wheel 1100.

As shown in FIG. 11, the color wheel 1100 is divided into three regions in the radial direction on the concentric circle. The outermost regions of the three regions are the outer regions 1110, 1130, and 1150, and the regions adjacent to the outer regions are called the inner regions 1120, 1140, and 1160.

In addition, the color wheel 1100 is subdivided into 120 degrees about the origin, and the first area is formed of the red area (R, 1110) and the blue area (B, 1120), and the second area is the blue area ( B and 1130, the green region G and 1140, and the third region are formed of the green region G and 1150 and the red region R and 1160.

Therefore, as the color wheel 1100 rotates, the first region, the second region, and the third region of the color wheel 1100 sequentially receive the white light 1000. Then, the first, second, and third rays having the first, second, and third colors are formed by transmitting and reflecting the received white light 1000.

Referring to FIG. 10 again, the first region of the color wheel 1100 is positioned on the optical path so that the blue regions B and 1120 are located inside and the red regions R and 1110 are located outside. When positioned, the blue region 1120 of the color wheel 1100 transmits only the blue light 1010 of the white light 1000 and reflects the light 1020 having a different color, that is, a different wavelength. The reflected light beam 1020 encounters the red region 1110 of the color wheel 1100 by the reflector plate 1200. In this case, only the red light beam 1030 is transmitted in the red region 1110 and another wavelength, that is, the green light beam 1040 is reflected.

Similarly, when the color wheel 1100 is rotated so that the second region is located on the optical path so that the green regions G and 1140 are located in the inner side, and the blue regions B and 1130 are positioned in the outer side, and the third region is in the third direction. Even when the region is located on the optical path, independent rays of light with three colors are output at the same time.

As described above, the blue light beam 1010, the red light beam 1030, and the green light beam 1050 passing or reflected through the color wheel 1100 are installed in proximity to the color wheel 1100. Is incident on each layer.

Accordingly, while the green, red, and blue light rays are sequentially emitted from the first member 1310, which is the top of the color bar 1300, the red, blue, and green light rays are sequentially emitted from the second member 1330. And blue, green, and red rays are sequentially emitted from the third member 1350. In conclusion, during the time when the color wheel 1100 rotates 360 degrees, the first, second, and third members 1310, 1330, and 1350 of the color bar 1300 respectively emit all three color rays. It will radiate sequentially. In addition, the color order of light rays output from the color bar 1300 is continuously repeated in response to the color recognition time of the person.

12A to 12C are graphs illustrating color transmission characteristics of respective regions of the color wheel 1100. In the red region R of the color wheel 1100, as shown in the graph of FIG. 12A, the red light beam is transmitted and the remaining light is reflected. In the same manner, in the remaining two colors, only the green light is transmitted in the green area G, only the blue light is transmitted in the blue area B, and the other wavelengths are reflected as shown in FIGS. 12B and 12C.

Transmission characteristics of each region of the color wheel 1100 are illustrated in Table 1 below.

As shown in FIG. 13, the color bar 1300 is composed of three glass members 1310, 1330, and 1350. The first member 1310 of the color bar is inclined at one end of the rectangular member, and the other two members 1330 and 1350 are manufactured as simple rectangular members with different lengths. In addition, the inclined surface of the first member 1310 forms a reflecting plate therein to allow the incident light rays to pass through the first member 1310 by changing a path. In addition, the first, second, and third members may be mirror-coated to the opposite surfaces when assembled, or have a fine spacing of 5 micrometers or more to prevent the light in one member from propagating to another member.

14 illustrates a small display device.

The small display device 960 includes a DMD, a reflective complementary metal oxide semiconductor (CMOS) array device, or a liquid crystal display (LCD).

Referring to FIG. 14, the operation region 1400 of the small display apparatus 960 is represented by three regions, namely, blue, red, and green regions 1410, 1420, and 1430. However, the rotation of the color wheel alternates the positions of the three regions indicated in the operating region 1400. Therefore, by making one cycle of the operation region shown in FIG. 14 smaller than the afterimage recognition time of the person, the individual separated color images are not recognized but are recognized as one color image.

It is well known to those skilled in the art to electrically drive the small display device 960. The small display device 960 is electrically driven so that the entire color of the image incident from the signal processing circuit is displayed on the small display device 960.

FIG. 15 illustrates the image signal processor of FIG. 9.

The image signal processor 970 includes a video signal processor 1500, a color signal separator 1530, a frame buffer 1540, a buffer mixer 1550, an output frame buffer 1560, and a display driver 1570. It is.

The image signal processor 970 receives a video image signal 975 (hereinafter, referred to as a first image signal), which is an analog signal input from the outside, from the video signal processor 1500. The video signal processor 1500 includes a video signal preprocessor 1510 and a digital processor 1520.

The first video signal 975, which is an analog signal, is selectively modulated by the video signal preprocessor 1510 according to a predetermined standard after decompressing or demodulating.

The digitally modulated first image signal is converted by the digital processor 1520 to a size of an image that can be displayed on the small display device 950, and a degamma for adjusting the brightness of a color image. Go through the process (Degamma).

The first image signal output from the digital processor 1520 is introduced into a color signal separator 1530 to form a frame for each color (S1960). In addition, each frame is divided into a predetermined number. Each frame divided into a predetermined number is stored in the frame buffer 1540.

As shown in FIG. 15, the color signal separator 1530 divides the red frame into three regions of R1, R2, and R3, divides the green frame into three regions of G1, G2, and G3, and similarly the blue frame. Is divided into three regions B1, B2, and B3, and stored in the frame buffer 1540 for each frame. In this case, selective access to each area stored in the frame buffer 1540 is possible.

The buffer mixer 1550 receives an optical path position signal 935 input from the color-specific ray splitter and selects an appropriate area in the frame buffer 1540 according to the optical path position signal 935 ( S1970).

For example, the optical path position signal 935 generated from the motor 1150 that rotates the color wheel 1100 includes color position information of the color wheel 1100. Therefore, when the first region of the color wheel 1100 is located in the operating region in response to the optical path position signal 935, the rays of each color passing through the first region are displayed on the small display device 960 as shown in FIG. 14. Therefore, the buffer mixer 1550 selects R2, G1, and B3. At this time, the buffer mixer 1550 selects G1 as the first color region of the output frame buffer 1560, R2 as the second color region of the output frame buffer 1560, and B3 represents the output frame buffer 1560. Each of them is stored in the third color area.

Even when the second region and the third region of the color wheel 1100 are located in the operating region, the first portion of the output frame buffer 1560 is synchronized with the optical path position signal 935 output from the motor 1150. RGB color images are formed in the second, third, and third color areas, and the second image signal 965 is output to the small display device 960 via the display driver 1570 (S1980).

FIG. 16 illustrates an example of the image separated by FIG. 15.

As illustrated, three images 1610, 1630, and 1650 are sequentially formed in the output frame buffer 1560 of the image signal processor 970 while the color wheel 1100 is rotated once. Reference number 1610 denotes a green image 1612 in the first color region of the output frame buffer 1560, a red image 1614 in the second color region, and a blue image 1616 in the third color region. will be. In the same manner, reference numeral 1630 also displays blue, green, and red images 1632, 1634, and 1636 in the first color region, the second color region, and the third color region of the output frame buffer 1560, respectively. will be. Reference numeral 1650 also shows a color image formed in the output frame buffer 1560 in the same manner as described above.

The division of the color image is performed by the image signal processor 970 at high speed.

The reproduction of the color image by the divided three images is shown in FIG. When the divided three images are displayed sequentially (1720-> 1740-> 1760) as time passes, the human is recognized as one color image 1700 according to whether the human averaged time.

18 is a view illustrating a beam separation device for each color according to another embodiment of the present invention.

As illustrated, when the first area of the color wheel 1100 is positioned on the optical path so that the blue areas B and 1120 are located inside and the red areas R and 1110 are located outside, the color wheel 1 The blue region 1120 of the 1100 transmits only the blue light 1010 of the white light 1000 and reflects the light 1020 having a different color, that is, a different wavelength.

The reflected light beam 1020 encounters the red region 1110 of the color wheel 1100 by the reflector plate 1800. In this case, only the red light beam 1030 is transmitted in the red region 1110 and the other wavelength, that is, the green light beam 1040 is reflected.

The reflected green light beam 1040 is diffracted by the reflector plate 1800 and input to the top 1820 of the color bar 18010.

Similarly, when the color wheel 1100 is rotated so that the second region is located on the optical path so that the green regions G and 1140 are located in the inner side, and the blue regions B and 1130 are positioned in the outer side, and the third region is in the third direction. Even when the area is located on the optical path, independent rays with three colors are output at the same time.

As described above, the blue light beam 1010, the red light beam 1030, and the green light beam 1050 passing or reflected through the color wheel 1100 are installed in proximity to the color wheel 1100. Is incident on each layer. At this time, the length of each layer of the color bar 1810 is the same.

As described in detail above, according to the image display system and the method of the present invention, it is possible to significantly increase the low light utilization efficiency of the simple color wheel system. In other words, each color component branched from the color wheel is not discarded, and all of them are used, and thus, the optical efficiency can be three times higher than that of the conventional method. Therefore, when using the same output lamp without complicated configuration of the image display system can be expected to be three times brighter than conventional.

Embodiment of the present invention is only one embodiment, of course, many modifications and variations of the components of the present invention without departing from the gist of the present invention, of course, the present invention is not limited to the embodiment. .

1 is a configuration diagram for explaining the principle of a general video display system.

FIG. 2 is a diagram illustrating a structure of the small display device of FIG. 1.

3 is a diagram illustrating a process of forming an original image by spatial combining of images for each color.

4 is a diagram illustrating a process of forming an original image by temporal combining of images for each color.

5 is a block diagram of a conventional image display system for implementing the original image of FIG.

6 shows a conventional color wheel.

7 is a view for explaining an operation example of a conventional color wheel.

8 is a diagram illustrating a method of synchronizing a conventional basic color image with an image signal output from an image processing circuit.

9 is a configuration diagram of an image display system according to an embodiment of the present invention.

FIG. 10 is a view illustrating a white light separation process of the color separation beam separating apparatus according to the embodiment of the present invention.

FIG. 11 shows the color wheel of FIG. 10.

12A to 12C are graphs showing transmission characteristics of wavelengths of the color wheel of FIG. 11.

FIG. 13 is an exploded view showing the constituent members of the color bar of FIG. 10.

FIG. 14 illustrates a process displayed on an operating area of a small display device according to rotation of a color wheel according to an exemplary embodiment of the present invention.

FIG. 15 illustrates the image signal processor of FIG. 9.

FIG. 16 illustrates an example of the image separated by FIG. 15.

17 is a diagram illustrating time domain reproduction of an image for each color according to an embodiment of the present invention.

18 is a view illustrating a beam separation device for each color according to another embodiment of the present invention.

19 is a flowchart illustrating an image display method according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

900: light source

910: heat cut filter

920: Illumination Lens

930: color separation device

935: optical location signal

940: focusing lens

950: Prism

960: small display device

965: second video signal

970: image signal processing unit

975: Video video signal (first video signal)

980: projection lens

990: projection screen

1000: white light

Claims (11)

delete delete Receives white light from the light source and separates the first, second, and third light beams corresponding to the first, second, and third colors, and sequentially alternates the optical paths of the first, second, and third light beams. Color splitting device; A signal processing device for separating a first video signal input from the outside into a video signal for each color and generating a predetermined second video signal by synchronizing the video signal for each color with an optical path that alternates sequentially; And And a small display device for outputting the first, second, and third light rays in response to the second image signal. The color-specific ray separation device , An inner region having a first collar that receives the white light and passes first rays and reflects second and third rays; And The outer and outer regions having a second collar that receives the second and third light beams diffracted by the reflecting plate and passes the second light beam and reflects the third light beam, wherein the inner and outer regions are formed of a disc. A color wheel which is formed in at least two regions in a radial direction, divides the disc into a predetermined center angle, and rotates about the center point of the disc; A reflector for changing the light path of the light beam reflected from the inner region of the color wheel to be parallel to the incident path of the white light so as to be incident on a predetermined layer of the color bar; And A stacked waveguide is provided so that the first, second, and third light beams propagated from the color wheel are individually incident, wherein the stacked upper bar is longer than the lower bar, and one side of the uppermost bar is an optical path of the incident light beam. It has a predetermined slope to change the, the inclined surface comprises a color bar applied with a reflective medium, The signal processing device, A video signal processor for converting the first image signal into a digital signal, adjusting the size of the image to correspond to the size of the small display device, and adjusting the brightness of the image; A color signal separator for dividing the first image signal output from the video signal processor into a color-specific image to form color-specific frames, and dividing each of the color-specific frames into a predetermined number; A frame buffer for storing the frames for each color divided into equal numbers each; A buffer mixer for selecting one area of the frame for each color by color in response to the ray position signal inputted from the color-specific ray separation device; And And an output frame buffer for combining and storing the region for each color selected by the buffer mixer. delete delete Receives white light from the light source and separates the first, second, and third light beams corresponding to the first, second, and third colors, and sequentially alternates the optical paths of the first, second, and third light beams. Color splitting device; A signal processing device for separating a first video signal input from the outside into a video signal for each color and generating a predetermined second video signal by synchronizing the video signal for each color with an optical path that alternates sequentially; And And a small display device for outputting the first, second, and third light rays in response to the second image signal. The color-specific ray separation device , An inner region having a first collar that receives the white light and passes first rays and reflects second and third rays; And The outer and outer regions having a second collar that receives the second and third light beams diffracted by the reflecting plate and passes the second light beam and reflects the third light beam, wherein the inner and outer regions are formed of a disc. A color wheel which is formed in at least two regions in a radial direction, divides the disc into a predetermined center angle, and rotates about the center point of the disc; A motor for rotating the color wheel at constant speed; A reflector for changing the light path of the light beam reflected from the inner region of the color wheel to be parallel to the incident path of the white light so as to be incident on a predetermined layer of the color bar; And A stacked waveguide is provided so that the first, second, and third light beams propagated from the color wheel are individually incident, wherein the stacked upper bar is longer than the lower bar, and one side of the uppermost bar is an optical path of the incident light beam. The image display system having a predetermined slope to change the, the inclined surface comprises a color bar applied with a reflective medium. Receives white light from the light source and separates the first, second, and third light beams corresponding to the first, second, and third colors, and sequentially alternates the optical paths of the first, second, and third light beams. Color splitting device; A signal processing device for separating a first video signal input from the outside into a video signal for each color and generating a predetermined second video signal by synchronizing the video signal for each color with an optical path that alternates sequentially; And And a small display device for outputting the first, second, and third light rays in response to the second image signal. The signal processing device, A video signal processor for converting the first image signal into a digital signal, adjusting the size of the image to correspond to the size of the small display device, and adjusting the brightness of the image; A color signal separator for dividing the first image signal output from the video signal processor into a color-specific image to form color-specific frames, and dividing each of the color-specific frames into a predetermined number; A frame buffer for storing the frames for each color divided into equal numbers each; A buffer mixer for selecting one area of the frame for each color by color in response to the ray position signal inputted from the color-specific ray separation device; And And an output frame buffer for combining and storing the region for each color selected by the buffer mixer. delete (A) inputting a color bar by passing a first light beam having the same color as the inner region of the color wheel receiving the white light, and reflecting the second and third light beams; (B) receiving the second and third light beams diffracted by the reflector, passing through a second light beam having the same color as the second area of the color wheel to enter the color bar and reflecting the third light beam; (C) the third light beam is input with a color bar so that the path is diffracted by the inclined surface of the color bar so that the path is parallel to the first and second light beams; And (D) rotating the color wheel at a predetermined constant speed so that the optical paths of the first, second, and third light beams are alternately sequentially; (E) generating a predetermined second video signal by separating the first video signal input from the outside into a video signal for each color and synchronizing the video signals for each color according to an alternate optical path; And (F) outputting the first, second, and third light beams corresponding to the second video signal. delete The method of claim 9, wherein the color bar, The stacked upper bar is longer than the lower bar, and one surface of the uppermost bar has a predetermined slope to change the optical path of the incident light, and the inclined surface is coated with a reflection medium. The video display method characterized by the above.