KR20050008025A - Color Wheel, and System including the Color Wheel for Displaying Color Image - Google Patents

Abstract

PURPOSE: A color wheel and an image display system provided with the same are provided to overcome the deterioration of color definition of the image generated at the boundary by forming the white region capable of transmitting the white light. CONSTITUTION: An image display system provided with a color wheel includes a lamp(310), a collimator lens(320), a color wheel(200), a light pipe(340), a controller(350), a signal processing unit(360), a small size display(370), a prism(380) and a projection lens(390). The collimator lens outputs the white light from the lamp with making the white light parallel. The color wheel sequentially forms the first, the second and the third lights by selectively passing a first, a second and a third colors. The light pipe makes the first to the third lights passing through the lens uniform in its illumination by a controller(350). The signal processing unit divides the image signal inputted from outside into a plurality of image signals for each color and synchronizes with the first to the third lights passing through the light pipe. And, the small size display displays the first to the third lights together with the image signals for each color.

Description

Color Wheel, and System including the Color Wheel for Displaying Color Image}

The present invention relates to an image display system, and more particularly, to an image display system including a collimator lens, a color wheel having a plurality of color filters, and a color wheel for enhancing light efficiency using a light pipe. .

1 illustrates a conventional color wheel and an image display system including the same.

As shown, white light emitted from the lamp 10 which is a light source is collected by the color wheel 20. The concentrated white light has a color selected through the color wheel 20, and then the brightness distribution of the light is uniform by multiple reflections in the light pipe 30.

The relay lens 40 causes the image of the exit surface of the light pipe 30 to be formed on the small display 60 so that the light beam having uniform brightness emitted from the light pipe 30 is uniform on the surface of the small display 60. To reach.

The controller 70 receives the current position information of the color wheel 20 and controls the bus to supply an image of a color corresponding to each color to the small display 60 such as an LCD.

However, the above-described image processing system has a problem in that two adjacent colors are mixed at the color boundary of the color wheel. Therefore, since the color purity of the light supplied to the small display 60 at the color boundary of the color wheel is deteriorated, the color sharpness of the image is deteriorated.

To overcome this problem, the small display device was turned off while white light passed through the border of the color wheel. As a result, the white light is not used during the time when the white light passes through the boundary region and is discarded, resulting in a decrease in light efficiency.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a color wheel and an image display system including the same for enhancing color clarity and improving light efficiency at a color boundary of a color wheel.

A color wheel according to the first aspect of the present invention for achieving the above object comprises a filtering area for filtering a predetermined wavelength of white light from the light source; And a transmission region for passing the white light as it is,

The filtering region may include a first filter region filtering the red color of the white light; A second filter area for filtering the green color; And a third filter area for filtering the blue color.

The transmission region may be a white region located between the first to third filter regions.

A color wheel according to the second aspect of the present invention for achieving the above object comprises a filter for sequentially filtering the first, second and third colors by filtering the white light from the light source when rotating around the axis of rotation; The filter is divided into three regions to filter the first, second and third colors; A boundary region is formed between the three regions so that the white light can pass therethrough.

The width of the boundary region is greater than or equal to the irradiation width of the white light irradiated to the filter.

According to a third aspect of the present invention, there is provided an image display system including a color wheel, including: a collimator lens for forming parallel white light from white light emitted from a light source; A color wheel that receives the parallel white light and sequentially passes the first, second, and third colors one by one to form first to third light rays, and passes the white light as it is at the boundary of the first to third colors. ; A light pipe having a Fresnel lens formed at an input end to equalize brightness by multiple reflections of the first to third light beams sequentially incident through the color wheel; A signal processing device for separating an image signal input from the outside into an image signal for each color and synchronizing the image signals for each color with the first to third light beams sequentially output; And a small display device for displaying the first to third light rays and the image signal for each color together.

The color wheel

A filter for forming a first light beam by passing one of the first, second, and third colors while receiving the parallel white light and reflecting the two colors; And a rotation axis for rotating the filter to sequentially form the second light ray and the third light ray, wherein the filter is divided into three regions to sequentially filter the first, second, and third colors. The boundary region is formed between the three regions so that the white light can pass through as it is.

An image display system including a color wheel according to the fourth aspect of the present invention for achieving the above object comprises a collimator lens for outputting the white light input from the light source as parallel white light parallel to the traveling direction; A color wheel that receives the parallel white light and passes through one of the first, second, and third collars while reflecting the two collars, thereby forming a first ray and sequentially rotating the second and third rays; A lens for providing a predetermined angle to a path of the first to third light beams sequentially incident through the color wheel; A light pipe for generating uniformity of brightness due to multiple reflections of the first to third light rays passing through the lens; A signal processing device for separating an image signal input from the outside into a video signal for each color and synchronizing the video signal for each color with the first to third light beams passing through the light pipe; And a small display device for displaying the first to third light rays and the image signal for each color together.

The lens may be a fresnel lens, a concave lens, or a convex lens formed through an etching process at an input end of the light pipe.

Therefore, according to the present invention, the color sharpness of the output image can be increased and the light efficiency can be increased.

1 illustrates a conventional color wheel and an image display system including the same.

2 shows a color wheel according to the invention.

3 shows an image display system including a color wheel according to a first embodiment of the present invention.

FIG. 4 illustrates a light pipe of the image display system of FIG. 3.

5 illustrates an image display system including a color wheel according to a second embodiment of the present invention.

6 illustrates an image display system including a color wheel according to a third embodiment of the present invention.

FIG. 7 illustrates another application example of the Fresnel lens in the image display system of FIG. 6.

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

200: color wheel

310: lamp

320: collimator lens

330 motor

340: light pipe

345: Fresnel lens

350: control unit

360: signal processing device

370: small display

380: Prism

390: projection lens

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

First embodiment

2 shows a color wheel according to the present invention, and FIG. 3 shows an image display system according to a first embodiment of the present invention. FIG. 4 illustrates a light pipe of the image display system of FIG. 3.

As shown in FIG. 2, the color wheel 200 may be largely divided into a filtering area and a transmission area.

The filtering region filters a predetermined wavelength of white light from a light source, and the transmission region passes the white light as it is. The filtering region may include a first filter region transmitting only a red color of the white light; A second filter region transmitting only a green collar; And a third filter region transmitting only a blue color. In addition, the transmission region is a white region located between the first to third filter regions.

In more detail, the color wheel 200 has boundary regions 280 through which white light passes, respectively, between the first, second, and third filters. The first, second, and third filters formed on the surface of the color wheel 200 transmit only one of the red, green, and blue colors corresponding to the three primary colors of light, respectively, and reflect light of another color. . In addition, the boundary area between the filter areas for each color is composed of a simple transmission area in which no filter is formed. The boundary regions 280 may have the same size or may have different sizes. However, the width of the boundary region 280 should be greater than or equal to the irradiation width of the white light irradiated to the filter.

The color wheel 200 receives white light and separates it into first, second, and third light rays, and the first, second, and third light rays have one of the first, second, and third colors. . The first, second, and third colors are red, green, and blue.

In other words, the color wheel 200 includes at least three filters 220, 240, and 260, and a rotation shaft 210 for rotating in a predetermined direction is connected to the motor 330.

The first light beam is formed by passing one of the first, second, and third collars while reflecting the two collars in the first filter 220. There is a white region that allows white light to pass between the first filter 220 and the second filter 240 so that white light is emitted after the first light beam is emitted from the color wheel 200.

The second filter 240 forms a second light beam by passing one of the colors except the color passed through the first filter 220, and also passes white light between the second filter 240 and the third filter 260. There is a white area that can be made so that white light is emitted after the second light beam is emitted from the color wheel 200.

The third filter 260 forms a third light beam by passing the remaining colors, and a white region exists between the third filter 260 and the first filter 220 to emit white light before emitting the first light beam. .

An image display system 300 using the color wheel 200 is illustrated in FIG. 3.

As shown in FIG. 3, the image display system 300 of the present invention includes a lamp 310, a collimator lens 320, a color wheel 200, a light pipe 340, a controller 350, The signal processor 360 includes a small display 370, a prism 380, and a projection lens 390.

The white light emitted from the lamp 310 has a light path traveling in one direction by the reflector 315.

White light emitted from the lamp 310 is incident on the color wheel 200 while maintaining parallel while passing through the collimator lens 320. The collimator lens 320 is composed of at least one collimator lens, and a plurality of the collimator lenses are preferably used. That is, the color filtering characteristic of the color wheel is improved by adjusting the incident angle to be perpendicular to the color wheel 200.

Light rays of red (R), green (G), and blue (B) sequentially generated while passing through the rotating color wheel 200 are incident to the light pipe 340. At this time, the Fresnel lens 400 is formed at the input terminal of the light pipe 340 to uniformly output the incident light rays (see FIG. 4).

The Fresnel lens 400 is formed by etching the input end of the light pipe 340 to have a predetermined width and height. As the light rays incident by the Fresnel lens 400 are diffracted, multiple reflections are made in the light pipe 340 to homogenize the output light rays.

Light rays passing through the light pipe 340 are redirected by the prism 380 to reach the small display 370. At this time, as the color wheel 200 rotates, the small display 370 is displayed in the order of red (R), white light, green (G), white light, and blue (B). Of course, the order of red, green, and blue is determined according to the rotation direction of the color wheel 200 or the order of forming the red, green, and blue filters.

When the position signal of the color wheel 200 generated from the motor 330 for rotating the color wheel 200 is input to the control unit 350, the signal processing unit 360 has a basic color having a specific color according to the position signal The image is transmitted to the small display 370.

For example, when red light passes through the color wheel 200 and reaches the small display 370, the signal processor 360 displays an image of a red component on the small display 370, and the color wheel 200 rotates. When the color of the transmitted light changes from red to green, the signal processor 360 changes the image displayed on the small display 370 from the red image to the green image in synchronization with this.

The position signal of the color wheel 200 generated by the motor 330 is generated in the boundary region where other colors are not filtered, that is, white light is transmitted through the color wheel 200. The signal processor 360 changes the basic color image according to the position signal.

The image signal formed by the light rays passing through the light pipe 340 and the basic color image is emitted through the projection lens 390.

Second embodiment

5 shows an image display system according to a second embodiment of the present invention.

As shown in FIG. 5, white light generated from the lamp 510 is input to the color wheel 520.

The color wheel 520 into which white light is introduced rotates about a central axis to filter white light by red, green, and blue filters to generate first to third light rays having red, green, and blue colors. In addition, the color wheel 520 has a white region through which white light can pass at the boundary between the red, green, and blue filters.

Therefore, white light exists between the first to third light beams passing through the color wheel 520 to the light pipe 530. For example, the color wheel 520 is led into the light pipe 530 in the order of red light, white light, green light, white light, blue light, and white light.

Since the rays entering the light pipe 530 have a form of light bundles that are collected at a predetermined range of angles by the action of the reflector of the lamp 510, the light pipes 530 may be mixed to cause multiple reflections on the inner wall of the light pipe 530. Therefore, the light exiting the light pipe 530 is uniform in brightness.

The white light and the first to third light rays are introduced into the small display 550 through the prism 540. At this time, in synchronization with the time that light passes through the white region of the color wheel 520, the signal processor 560 may generate a color image corresponding to the color following the white region of the color wheel 520 among the basic color images. The display is selected and displayed on the small display 550.

The image signal formed by the first to third light rays and the basic color image introduced into the small display 550 is emitted through the projection lens 570.

Third embodiment

6 shows an image display system according to a third embodiment of the present invention.

As shown, the third embodiment is a conventional image display system using the color wheel 600, the front end of the color wheel 600, the collimator lens 610, the front end of the light pipe 630 Fresnel lens 620 is provided.

Instead of forming the Fresnel lens 620 at the input end of the light pipe 630 is provided with a concave or convex lens as shown in FIG.

As described above in detail, according to the color wheel of the present invention and the image display system including the same, the color purity generated in the boundary region is first formed by forming a white region that can transmit white light in the boundary region of the RGB filter of the color wheel. Deterioration and color deterioration of the image can be overcome.

In addition, the light efficiency can be increased since white light does not have to be turned off while passing through the border of the color wheel.

In addition, by using a collimator lens to reduce the incident angle of the white light incident on the color wheel to improve the operability of the filter formed on the color wheel it is possible to increase the purity of the color filtered through the filter.

In addition, by providing a Fresnel lens at the input end of the light pipe, light reflection can be obtained by multiplexing reflection inside the light pipe by diffraction.

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. .

Claims (10)

A filtering area for filtering a predetermined wavelength of white light from the light source; And And a transmission area for passing the white light as it is. The method of claim 1, wherein the filtering area is A first filter area filtering the red color of the white light; A second filter area for filtering the green color; And And a third filter area for filtering the blue color. The method of claim 2, wherein the transmission region is And a white region located between the first to third filter regions. A filter for sequentially filtering the first, second, and third colors by filtering the white light from the light source when rotating about the rotation axis; The filter is divided into three regions to filter the first, second and third colors; A color wheel, characterized in that the boundary region is formed between the three regions so that the white light can pass. The color wheel according to claim 4, wherein the width of the boundary region is equal to or greater than the irradiation width of the white light irradiated to the filter. A collimator lens for forming parallel white light from white light from a light source; A color wheel that receives the parallel white light and sequentially passes first, second, and third colors one by one to form first to third light rays, and passes the white light at a boundary of the first to third colors; A light pipe having a Fresnel lens formed at an input end to equalize brightness by multiple reflections of the first to third light beams sequentially incident through the color wheel; A signal processing device for separating an image signal input from the outside into an image signal for each color and synchronizing the image signals for each color with the first to third light beams sequentially output; And And a small display device for displaying the first to third light beams and the color-specific image signal together. The method of claim 6, wherein the color wheel is A filter for forming a first light beam by passing one of the first, second, and third colors while receiving the parallel white light and reflecting the two colors; And A rotation axis for rotating the filter to sequentially form a second light ray and a third light ray, The filter is divided into three regions to sequentially filter the first, second, and third colors, and a boundary region is formed between the three regions to allow the white light to pass therethrough. Image display system comprising. A collimator lens for outputting white light input from a light source as parallel white light parallel to a traveling direction; A color wheel that receives the parallel white light and passes through one of the first, second, and third collars while reflecting the two collars, thereby forming a first ray and sequentially rotating the second and third rays; A lens for providing a predetermined angle to a path of the first to third light beams sequentially incident through the color wheel; A light pipe for generating uniformity of brightness due to multiple reflections of the first to third light rays passing through the lens; A signal processing device for separating an image signal input from the outside into an image signal for each color and synchronizing the image signal for each color with the first to third light rays passing through the light pipe; And And a small display device for displaying the first to third light beams and the color-specific image signal together. The method of claim 8, wherein the lens An image display system comprising a color wheel, characterized in that the Fresnel lens formed in the input terminal of the light pipe through an etching process. The method of claim 8, wherein the lens An image display system comprising a color wheel, characterized in that it is a concave lens or a convex lens.