KR101024925B1 - Projector - Google Patents

Abstract

The present invention relates to a projector. More specifically, the present invention relates to a projector capable of miniaturizing the size by simplifying the configuration for synthesizing the light provided by the light source for each color.

Projector, LED, Dichroic, Dichroic, Light Tunnel

Description

Projector {PROJECTOR}

The present invention relates to a projector that can reduce the size by simplifying the configuration for synthesizing the light provided from the light source unit for each color.

The present invention relates to a projector that can reduce the size by simplifying the configuration for synthesizing the light provided from the light source unit for each color. The projector converts video signals from various video devices such as TVs, VCRs, DVD players, PCs, camcorders, etc. into projection images, and then uses the light provided from the light source to generate projection light and project it on the screen to enlarge it to the user. It is a device for providing a video. Recently, the use of the projector is increasing along with the increase with the digital imaging device. Conventional PRT type projectors implement a projected image by using a small, bright CRT, and then form an image on the screen through a lens. The PRT has a single tube and three PRTs of red, green, and blue. Branch to include three-tube PRT type projector was used

In addition to the PRT method, an LCD method, a DLP method, or an LCOS method are provided. The LCD or Lcos system has three separate LCD panels or Lcos panels, respectively, to display projection images corresponding to the red, green, and blue polarizations of the video signal.

Each pixel may be activated to adjust the amount of red, green, and blue color transmitted when light provided from the light source passes through or reflects through the LCD panel or Lcos panel. Digital Light Processing (DLP) uses a Digital Micromirror Device or a DLP chip. Each DLP chip is equipped with 2 million hinge-mount rectangular miniature mirrors, allowing angle adjustments up to thousands of times per second. DLP projectors use a single or three chip configuration.

In addition, in the LCD method, light provided from a light source passes through a transmissive LCD panel, and a color corresponding to a provided image is given. In the LCOS (Liquid Crystal on Silicon) method, light is reflected to a liquid crystal unlike an LCD panel. The method is applied to form a color-specific projection light to reflect the light provided from the light source. As a result, the reflected light may have less loss than the way it is transmitted. Therefore, it is possible to reduce the loss that can occur in the process of light passing through the panel, it is possible to implement an improved image quality.

The LCD, DLP, or LCOS type projectors described above use a method of converting white light supplied from a lamp-type light source into polarized light for each color and then reflecting or transmitting the display device having no light emitting ability.

Recently, a projector employing a small light emitting element such as a light emitting diode (LED) or a laser diode as a light source has been used. If the projector is not used in a fixed position but is inappropriate to use a lamp-type light source with a large volume and energy consumption for application to a mobile phone or a portable projector, an LED or a laser diode may be employed as the light source.

When using a light source such as a light-emitting diode (LED) or a laser diode for each color, there is no need for a separate polarization configuration, so that the volume can be downsized, which is suitable for a small projector.

However, such an LED or a laser diode has a problem that the amount of light is small compared to a projector using a light source of a conventional lamp type. That is, although the projector can be miniaturized, sufficient light quantity may not be guaranteed, and thus the utility of the projector may be degraded.

In addition, since the light source itself is provided for each color, a configuration for polarization may be omitted, but a synthetic prism for synthesizing light may be provided, thereby limiting the size of the projector. That is, in order to be mounted on a portable terminal or the like, the size of the projector or its module needs to be further reduced, but there is a problem in that satisfactory miniaturization cannot be guaranteed when using a conventional synthetic prism or the like.

The present invention is to solve the problem to provide a projector that can be reduced in size by simplifying the configuration for synthesizing the light provided by the light source for each color.

In order to solve the above problems, the present invention is a color-specific light source unit having at least one or more LED elements; Among the light source units, a plurality of dichroic filter units which transmit only light corresponding to the color of light supplied from the adjacent light source unit are provided in a plurality of spaced apart states. Being a light tunnel; At least one light guide having one end disposed in front of the light source unit and the other end configured to form the dichroic filter unit to guide the light emitted from the light source unit to the filter unit of the light tunnel; A display device for converting an image signal into a projection image and reflecting the synthesized light supplied from the light tunnel into a projection light; And a projection lens unit for projecting the projection light reflected from the display element to the outside, wherein the dichroic filter unit is coated with a dichroic filtering material on a predetermined region of the light tunnel, or a film of dichroic filter material is formed. Provide an attached projector.
In addition, the LED elements constituting the light source unit may be disposed behind the filter unit based on the longitudinal direction of the light tunnel to project light toward the filter unit side.
In addition, the other end of the light guide may form an inclined surface to correspond to the outer surface of the dichroic filter part of the light tunnel.
In addition, the angle formed by the light guide and the light tunnel may be smaller than 90 degrees and larger than the first angle which is the total reflection critical angle.
In addition, when there are two or more LED elements constituting each light source unit, each LED element may be disposed radially toward the opening side of the light guide.
In addition, the light source unit of a specific color among the light source unit may be provided at least two or more spaced apart state.
Also, at least two light source units may be a red light source unit and a blue light source unit.
In addition, a light source unit of a specific color among the light source units may be disposed in front of an opening of one end of the light tunnel.
The light source unit disposed in front of the opening of one end of the light tunnel may be a green light source unit.
In addition, two or more of the red light source unit or the blue light source unit may be provided at different positions in the longitudinal direction of the light tunnel.
In addition, a total reflection mirror coating may be omitted on the inner surface of the light tunnel corresponding to the outer surface of the light tunnel provided with the dichroic filter unit.

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The projector according to the present invention can simplify the configuration for synthesizing the light provided by the light source unit for each color, thereby miniaturizing its size.

In addition, the projector according to the present invention can omit the synthetic prism for synthesizing the light provided by the light source unit for each color, thereby reducing the production cost of the product.

In addition, since the projector according to the present invention uses the longitudinal side of the light tunnel for color synthesis, it is possible to mount a plurality of LED elements constituting the light source unit, thereby increasing the brightness of the light provided from the projector.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosure may be made thorough and complete, and to fully convey the spirit of the present invention to those skilled in the art. Like numbers refer to like elements throughout.

The projector according to the present invention includes a plurality of light source units for each color having at least one or more LED elements, and a plurality of dichroic filter units for transmitting only light corresponding to the color of the light supplied from the adjacent light source units among the light source units, wherein the projectors are spaced apart from each other. And a display device in which light passing through the dichroic filter unit is totally reflected therein and supplied in a predetermined direction, and a display device converting an image signal into a projection image to reflect light supplied from the light tunnel.

The present invention uses an LED element as a light source for downsizing the projector. As described above, as a configuration for synthesizing light for supplying color spectroscopy provided from a light source to the display device, the present invention uses a light tunnel instead of a synthetic prism.

The light tunnel is a part for improving the uniformity of light and total reflection of the light projected into it. In general, a light tunnel is a display device. In a DLP type projector using Ti's DMD device, light passing through a color wheel that forms color spectroscopy enters light supplied from a lamp. After uniformity is improved by total reflection in the light tunnel, optical correction is performed by the lens and reflected by the mirror to be used in the process of converting the image into the projection light reflected by the DMD element.

However, the projector according to the present invention plays a role of synthesizing each light supplied from a light source unit for each color having an LED element before supplying it to a reflective display element such as a DMD element.

1 shows some examples of a light tunnel 100 employed in a projector in accordance with the present invention. More specifically, FIG. 1A is a perspective view of a light tunnel 100a in which the area of the optical path is constant in its longitudinal direction, and FIG. 1B is a view of the light tunnel 100b in which the area of the optical path is reduced in its longitudinal direction. 1 (c) is a perspective view of the light tunnel 100c in which the area of the optical path is increased in its longitudinal direction.

The light tunnel shown in FIG. 1 is constituted by two pairs of reflecting mirrors 110 and 120 facing each other. The width of the first reflecting mirror 110a parallel to the second reflecting mirror 120a perpendicular to the drawing may be determined by the aspect ratio of the projection image.

As shown in FIG. 1A, when the first reflecting mirror 110a and the second reflecting mirror 110b have a rectangular shape, the area of the light path therein is kept constant, and FIG. 1 As shown in (b) and (c) of FIG. 1, when the first reflecting mirror 110a and the second reflecting mirror 110b have a trapezoidal shape, the area of the light path therein is reduced or increased. Can be.

As described above, the light tunnels 100b and 100c illustrated in FIGS. 1 (b) and 1 (c) have a variable light path area, and thus control the density of light transmitted through the light tunnel. Effects of the same light tunnel in the light tunnels 100b and 100c shown in FIGS. 1 (b) and 1 (c) may vary depending on the installation direction thereof. That is, if the area of light passing through the light tunnel 100 is narrow but the brightness is increased, the light is totally reflected from left to right on the ground in the same direction as that of FIG. 1 (b), and FIG. Can be reduced and its area increased.

The projector according to the present invention uses an LED element as a light source unit for providing light. Also called a light emitting diode (LED). The luminescence that occurs when a voltage is applied to a semiconductor is called electric luminescence (electroluminescence), and it comes from observation of luminescence of silicon carbide crystals. High luminous efficiency at gallium arsenide p-n junctions has been found to be commercially available.

Unlike conventional lighting such as incandescent lamps and fluorescent lamps, the LED devices are widely used in recent years because they can reduce energy by up to 90% due to high efficiency of converting electrical energy into light energy. Intermetallic compound junction diode that emits light when current flows through the junction. Different colors of light can be obtained depending on the type of device.

Thus, a projector using LED as a light source uses red (R), blue (B) and green (G) LED elements to emit red (R), blue (B) and green (G) light, Projected light may be generated by synthesizing the emitted light and reflecting or transmitting the synthesized synthesized light to a display device that converts an image signal supplied from the outside into a projection image.

However, despite the low power consumption or durability of the LED elements, there is a problem that the individual LED elements cannot yet obtain a sufficient amount of light to be used as a light source of the projection light projected from the projector.

In addition, since the synthesis prism for synthesizing light for each color has a relatively large volume compared to a light source and the like, in order to miniaturize the projector, it is necessary to minimize the volume of the composition for synthesizing the light provided by the color-specific LED elements.

Therefore, the projector according to the present invention uses a LED element having a limited amount of light to ensure a certain amount of light and to minimize the volume of the projector, a light tunnel, not a synthetic prism, as a means for synthesizing the color-specific light provided from the light source portion. Use 100.

The principle of synthesizing the color-specific light by using the light tunnel 100 is a method of matching the light path of the light provided by the color-specific light source by repeatedly totally reflecting the light entering the light tunnel.

Therefore, light provided by the light source unit for each color needs to enter the light tunnel 100 for synthesis. However, since the general shape of the light tunnel has a quadrangular mirror shape in which a total of four total reflection mirrors are bonded, in order for light to enter therein, an opening which is one of both ends of the light tunnel must be used.

However, it is not easy to receive light from all the light sources for each color through the opening of one end of the light tunnel 100. That is, since all the light sources for each color must be disposed near the openings having the limited area, light cannot be incident efficiently.

Therefore, the light tunnel for synthesizing the light of the projector according to the present invention is configured to allow light to be incident on the outer surface in addition to the opening of one end thereof.

Therefore, in order to allow the light supplied from the LED element to enter the light tunnel from the outside of the light tunnel, the dichroic filter unit df that transmits only light corresponding to a specific color to the outside of the light tunnel of the projector according to the present invention (df). ) Is provided in plurality.

A dicroic filter (df) refers to an optical filter that selectively passes light according to the wavelength. A high pass filter that passes a high wavelength but reflects a low wavelength and a low pass filter that passes a low wavelength but reflects a high wavelength may be classified as a filter that selectively transmits light according to color by wavelength.

The dichroic filter may be coated with a dichroic coating material or a dichroic film attached to a predetermined region of the inner side or the outer side of the light tunnel 100.

The dichroic filter is optionally provided in the light tunnel to transmit light for each wavelength. In order to facilitate total reflection of light, the light tunnel is often bonded to a glass sheet and has a total reflection mirror coating therein. However, since the mirror coating for total reflection may interfere with the light transmission of the dichroic filter part, it is preferable that the part corresponding to the part provided with the dichroic filter part is not a total reflection coating.

Therefore, when the total reflection coating is provided on the inner side of the light tunnel, and the dichroic filter part is provided in the form of the dichroic coating on the outer side of the light tunnel, the part where the dichroic filter part is provided is omitted in the inner side surface of the total reflection coating. do.

For convenience of explanation, the following red dichroic filter, blue dichroic filter and green dichroic filter selectively transmit only red (R), blue (B) and green (G) light, respectively, blue (B) and Green (G), red (R) and green (G), red (R) and blue (B) light is defined as meaning a filter that is not transmitted but is scattered or reflected.

Of course, not all of the red dichroic filter, blue dichroic filter, and green dichroic filter should be provided on the outer surface of one light tunnel, and more dichroic filters of a specific color may be provided.

2 to 5, a process of synthesizing light provided by the light source unit for each color using the light tunnel will be described in detail.

2 illustrates an embodiment of a process in which light provided from a light source unit of a projector according to the present invention is synthesized in a light tunnel. More specifically, Fig. 2 (a) shows a case where one LED element constitutes each light source portion, and Fig. 2 (b) shows a case where two LED elements constitute each light source portion.

As shown in FIG. 2, the light tunnel 100 includes a dichroic filter unit df that transmits only light corresponding to the color of light supplied from a nearby light source unit among a plurality of light source units including an LED element. It is provided with a plurality of the plurality of spaced apart from the side, the LED element constituting the light source unit 200 is disposed behind the dichroic filter unit (df) based on the longitudinal direction of the light tunnel.

In the embodiment shown in FIG. 2, the red (R), blue (B) and green (G) light source portions each comprising a red (R), blue (B) and green (G) LED element are respectively formed of the light tunnel. It is provided on the outer side or the open end of the said light tunnel.

In the embodiment shown in Figure 2 (a), since there is only one LED element constituting each light source unit 200, the light source unit means the LED element. Of course, the components for supporting the LED element is a concept included in the light source.

As shown in FIG. 2A, the red light source unit 200r and the blue light source unit 200b of the light source unit 200 are provided near the outer surface of the light tunnel 100, and the green light source unit 200g includes the light source unit 200g. It is provided in front of the open opening of one end of the light tunnel 100.

The reason why the green light source is provided at the front end of the opening is that the ratio of the green light to the synthesized light of the color light provided by the color light source accounts for about 70% or more. Through the blade filter, a method of directly projecting light through an opening in one end of the light tunnel, rather than transmitting light into the light tunnel, is used.

The position of the light source for each color of the embodiment shown in FIG. 2 is not specified, and the position may be variably changed. In order to allow the light emitted from the LED element of the light source unit to enter the light tunnel and totally reflect in a specific direction, the LED element constituting the light source unit may be disposed behind the filter unit based on the length direction of the light tunnel. Has a feature to be arranged.

That is, to prevent the light supplied from the light source unit 200 from being incident in a direction perpendicular to the longitudinal direction of the light tunnel 100.

In the embodiment shown in FIG. 2A, an angle θ between a blue light source unit 200b and a blue dichroic filter unit df (b) is formed by a straight line connecting the center of the blue dichroic filter unit. ) Is preferably determined to be smaller than 90 degrees and larger than the total reflection critical angle θ1.

The reason why a straight line connecting the center of the blue light source unit 200b and the blue dichroic filter unit df (b) with the blue dichroic filter unit should be less than 90 degrees. This is to allow the light entering the inside to be synthesized and totally reflected in a specific direction.

In addition, the angle θ of the straight line connecting the center of the blue light source unit 200b and the blue dichroic filter unit df (b) to the blue dichroic filter unit df (b) is total reflection. The reason why it should be set to be larger than the critical angle θ1 is to prevent the light emitted from the blue light source unit 200b from being totally reflected without entering the light tunnel.

Therefore, the above-mentioned angle condition (θ1 <θ <90 degrees) is satisfied, and the light incident on the dichroic filter unit df (b) is filtered by the blue dichroic filter and then the blue light source unit. It is totally reflected in the direction opposite to the biased direction and synthesized with other colors of light.

In the embodiment shown in FIG. 2A, the blue light source unit 200b including the blue LED element is disposed near the blue dichroic filter unit df (b) to emit light emitted from the blue LED element. Light is supplied to the dichroic filter unit df (b).

Therefore, the light source part which emits light of the wavelength which can pass through each dichroic filter part is arrange | positioned near each dichroic filter part.

Then, only light supplied from the light source unit disposed in the vicinity of each dichroic filter unit may be transmitted through each dichroic filter unit.

In the embodiment shown in Figure 2 (a), since the rust light source unit 200g directly supplies the light to the opening of the light tunnel, it is not filtered like the blue light source unit 200b and the red light source unit 200r, so that the amount of light The loss can be minimized.

2 (b) is the same as the embodiment shown in FIG. 2 (a), the position and the number of the light source unit 200 for each color is the same. However, unlike the embodiment shown in FIG. 2A, the number of LED elements constituting each light source unit 200 is two.

The LED elements constituting the light source unit have advantages of low power consumption and excellent durability, but a sufficient amount of light may not be guaranteed as a single LED element.

Therefore, as shown in FIG. 2B, the amount of light that is insufficient may be compensated for by increasing the number of LED elements constituting the light source unit 200.

Therefore, as shown in FIG. 2 (b), the LED element constituting the blue light source unit includes a first blue LED element 200b1 and a second blue LED element 200b2, and the LED constituting the red light source unit. The device includes a first red LED device 200r1 and a second red LED device 200r2, and the LED device constituting the green light source unit includes the first green LED device 200g1 and the second green LED device 200g2. Include.

The number of LED elements constituting each light source unit may be determined in consideration of the size of the dichroic filter unit or the light tunnel.

In the embodiment shown in Figure 2 (b), the number of LED elements constituting the light source unit 200, but two or more LED elements may be provided.

Therefore, as shown in FIG. 2B, the brightness of the projector may be increased by adjusting the number of LED elements constituting each light source unit.

3 illustrates one embodiment of a process in which light provided from a light source unit of a projector according to the present invention is synthesized in a light tunnel. More specifically, Fig. 3A shows the case where one LED element constituting each light source portion is shown, and Fig. 3B shows the case where two LED elements constituting each light source portion are shown.

Descriptions duplicated with the description with reference to FIG. 2 will be omitted.

Unlike the embodiment illustrated in FIG. 2, the embodiment illustrated in FIG. 3 illustrates a case in which two light source units corresponding to at least one color are provided.

That is, in the embodiments shown in FIGS. 3A and 3B, the red light source 200r includes the first red light source 200r (1) and the second red light source 200r (2), respectively. In addition, the blue light source unit 200b also includes a first blue light source unit 200b (1) and a second blue light source unit 200b (2).

Since the light tunnel 100 is formed in a long pipe shape, when the same dichroic filter part df corresponding to the same color is provided on the outer side of the light tunnel, each dichroic filter part is provided. Light may enter at.

Therefore, in the embodiment illustrated in FIGS. 3A and 3B, a total of four dichroic filter units are provided on the outer surface of the light tunnel. In the embodiment shown in FIG. 3, two blue dichroic filter portions df (b) and two red dichroic filter portions df (r) are spaced apart from the outer surface of the light tunnel 100. Is provided in the place.

Thus, in the embodiment shown in Figure 3, the dichroic filter unit (df) may be provided facing the pair of the first reflecting mirror or a pair of second reflecting mirror, the first reflecting mirror and the first reflecting mirror It may be provided dispersed in the two reflection mirrors.

In other words, the latter case is not a structure in which the light source portion is disposed on the same plane, but the light source portion is provided on the side surface and the upper surface of the light tunnel. As such, the position of the dichroic filter unit df may be determined after the position of the light source unit determined according to the design or structure of the projector is determined.

In the embodiment shown in Fig. 2 (b) and the embodiment shown in Fig. 3 (a), the total LED elements constituting the red light source part and the blue light source part are the same, but in the case of the embodiment shown in Fig. 3 (a), respectively. 2 may increase the brightness of the synthetic light than the embodiment shown in FIG. 2 (a), and unlike the embodiment shown in FIG. 2 (b), between the light generated between the LED elements constituting the light source unit of the same color. Problems such as interference of light that may be generated may be minimized.

In addition, in the embodiment shown in FIG. 2 (b), when the size of the light tunnel is small, it may be physically difficult to configure two or more light source units and arrange them in front of the same dichroic filter unit (df). Since it increases the volume or area occupied by the light source unit 200 around the light tunnel, it may be disadvantageous to compact the projector which is one of the objects of the present invention, but the embodiment shown in FIG. Since the light source unit is disposed in a state spaced apart in the direction, the optical system of the projector can be made slimmer.

3 (b) shows an embodiment in which two LED elements configuring each light source unit 200 are provided. Similarly to the embodiment shown in FIG. 3 (a), the red light source unit 200r includes the first red light source unit 200r (1) and the second red light source unit 200r (2), respectively. ), The blue light source unit 200b also includes a first blue light source unit 200b (1) and a second blue light source unit 200b (2), and the green light source unit 200g includes one end of the light tunnel 100. Is placed in front of the opening. Of course, a plurality of the green light source parts 200g may also be disposed near the outer surface of the light tunnel.

In the embodiment shown in FIG. 3 (b), the number of LED elements constituting each light source unit is two, in order to increase the brightness of the composite light, similarly to the embodiment shown in FIG. 2 (b).

Specifically, the first blue light source unit 200b (1) includes a first blue LED element 200b1 and a second blue LED element 200b2, and the second blue light source unit 200b (2) includes a third blue LED element. 200b3 and the fourth blue LED element 200b4. The first blue light source unit 200b (1) and the second blue light source unit 200b (2) may be disposed in a diagonal direction with respect to the light tunnel. This is to minimize the possibility of the light incident through a specific dichroic filter part exiting the light tunnel through the opposite dichroic filter part by varying the wavelengths of light incident at the same point in the longitudinal direction of the light tunnel.

Similarly, the first red light source unit 200r (1) includes a first red LED element 200r1 and a second red LED element 200r2, and the second red light source unit 200r (2) includes a third red LED element. 200r3 and the fourth red LED element 200r4. In addition, the first red light source unit 200r (1) and the second red light source unit 200r (2) may be disposed in a diagonal direction with respect to the light tunnel 100.

Accordingly, in the embodiment shown in FIG. 3 (b), the amount of light of each light source unit 200 is increased, so that the brightness of the synthetic light totally reflected through the light tunnel may be increased as compared with the embodiment shown in FIG. 3 (a). . Parts duplicated with the description with reference to FIGS. 2 and 3 (a) will be omitted.

4 illustrates another embodiment of a process in which light provided from a light source unit of a projector according to the present invention is synthesized in a light tunnel.

Since the embodiment shown in FIG. 4 basically has the same optical structure as the embodiment shown in FIG. 3, a description overlapping with the description with reference to FIG. 3 will be omitted.

Unlike the embodiment illustrated in FIG. 3, the embodiment illustrated in FIG. 4 includes at least one light guide 300 guiding the dichroic filter unit of the light tunnel.

The light guide 300 is a light guide member having the same structure as the light tunnel. Therefore, the light guide also totally reflects the light entered from the inside, and serves to supply light in a predetermined direction.

In the embodiment shown in FIG. 4, it is shown that the light guide 300 is provided between each light source unit 100 and each dichroic filter unit 200.

4A and 4B, respectively, the first red light source 200b (1), the second red light source 200b (2), and the first red dichroic filter unit. a first red light guide 300r1 and a second red light guide 300r2 connecting the df (b1) and the second red dichroic filter unit df (r2), and the first blue light source unit Connecting the second blue light source unit 200b (2), the first blue dichroic filter unit df (1), and the second blue dichroic filter unit df (2). The first blue light guide 300b1 and the second blue light guide 300b2 are provided.

Here, the light guide connecting each light source unit for each color and the dichroic filter unit for each color is added with a limitation of red or blue for convenience of name, and does not mean having a color of the light guide itself.

Since each of the light guides can reduce the radiated light emitted from each light source to some extent, the brightness of the synthetic light can be increased even when the LED element having the same amount of light is used as the light source.

In addition, when there are two or more LED elements constituting each light source unit, each LED element may be disposed radially toward the opening side of the lattice guide. This is to increase the rate at which the light emitted from the LED device enters the light guide.

5 shows another embodiment of a process in which light provided from a light source unit of a projector according to the present invention is synthesized in a light tunnel.

5 has the basic structure of the optical system described with reference to FIGS. 3 and 4, and thus, portions overlapping with the description will be omitted.

5 is a first red light connecting the first red light source unit, the second red light source unit, the first red dichroic filter unit, and the second red dichroic filter unit similarly to the embodiment shown in FIG. 4. And a light guide 300r1 'and a second red light guide 300r2', wherein the first blue light source 200b (1), the second blue light source 200b (2), and the first blue dichroic filter are provided. A first blue light guide 300b1 'and a second blue light guide 300b2' connecting the part df (b1) and the second blue dichroic filter part df (b2) are provided.

The embodiment shown in FIG. 4 and the embodiment shown in FIG. 5 have a difference in the shape of the light guide. The light guide illustrated in FIG. 4 is a structure in which a rectangular reflecting mirror is bonded to each other, and when light is projected from a light source disposed behind the dichroic filter unit based on the longitudinal direction of the light tunnel, the light guide and the dichroic The filter portion is difficult to join without play.

Therefore, the light emitted from each light source unit and incident on the dichroic filter unit by the light guide incident at an angle smaller than the total reflection grain boundary cannot pass through the dichroic filter unit and enter the light guide. It may be totally reflected from the filter part and radiated to the outside.

Therefore, the light guide illustrated in FIG. 5 may be configured to have an inclined surface corresponding to the outer surface of the light tunnel so as to block the entire upper surface of each dichroic filter unit.

That is, a structure for shielding the entire dichroic filter part may be obtained by configuring the reflection mirror constituting the light guide as a pair of rectangular pairs having different lengths and a pair of right angle trapezoids having the same area.

6 shows a conceptual diagram of one embodiment of a projector according to the present invention.

In the embodiment shown in Figure 6, the light tunnel for the light source and photosynthesis is applied to the embodiment shown in Figure 5 (a).

Since the light provided by the light source unit for each color is synthesized by the light source unit for each color and used as the synthesized light, the description of FIG. 5 (a) will be omitted since it will be overlapped.

Color-specific light provided from the light source unit is totally reflected inside the light tunnel and synthesized to exit the light tunnel. The synthesized light synthesized in the light tunnel passes through the illumination lens 350 and is corrected to the corresponding size of the display device 400, and is reflected toward the display device 400 through a plurality of reflectors.

As described above, the display device may be a reflective DMD device or a Lcos panel. When the composite light is reflected by the display device 400, it is converted into projection light including an image implemented in the display device.

Therefore, the projection light reflected by the display device 400 is projected onto the screen through the projection lens unit 500 to provide an image.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. . It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

1 shows some examples of light tunnels employed in a projector according to the present invention.

2 illustrates an embodiment of a process in which light provided from a light source unit of a projector according to the present invention is synthesized in a light tunnel.

3 illustrates one embodiment of a process in which light provided from a light source unit of a projector according to the present invention is synthesized in a light tunnel.

4 illustrates another embodiment of a process in which light provided from a light source unit of a projector according to the present invention is synthesized in a light tunnel.

5 shows another embodiment of a process in which light provided from a light source unit of a projector according to the present invention is synthesized in a light tunnel.

6 shows a conceptual diagram of one embodiment of a projector according to the present invention.

Claims (14)

A color-specific light source unit having at least one or more LED elements; Among the light source units, a plurality of dichroic filter units are formed to be spaced apart from each other, and only light corresponding to the color of light supplied from the adjacent light source unit is provided. Being a light tunnel; At least one light guide having one end disposed in front of the light source unit and the other end configured to form the dichroic filter unit to guide the light emitted from the light source unit to the filter unit of the light tunnel; A display device for converting an image signal into a projection image and reflecting the synthesized light supplied from the light tunnel into a projection light; And It includes a projection lens for projecting the projection light reflected from the display element to the outside, The dichroic filter unit is coated with a dichroic filtering material or a film of a dichroic filter material in a predetermined area of the light tunnel. delete The method of claim 1, The LED element constituting the light source unit is disposed behind the filter unit based on the longitudinal direction of the light tunnel, characterized in that for projecting light to the filter unit side. delete delete The method of claim 1, And the other end of the light guide forms an inclined surface to correspond to an outer surface of the dichroic filter part of the light tunnel. The method of claim 1, And the angle formed by the light guide and the light tunnel is smaller than 90 degrees and larger than a first angle which is a total reflection critical angle. The method of claim 1, And when there are two or more LED elements constituting each of the light source units, each LED element is disposed radially toward the opening side of the light guide. The method of claim 3, Projector, characterized in that provided with at least two light source units of a specific color of the light source unit spaced apart. 10. The method of claim 9, And at least two light source parts are red light source parts and blue light source parts. 10. The method of claim 9, The light source unit of a specific color of the light source unit, characterized in that disposed in front of the opening of one end of the light tunnel. The method of claim 11, And a light source unit disposed in front of an opening of one end of the light tunnel. The method of claim 10, And at least two of the red light source unit or the blue light source unit are provided at different positions in the longitudinal direction of the light tunnel. The method of claim 1, The inner surface of the light tunnel corresponding to the outer surface of the light tunnel provided with the dichroic filter unit is characterized in that the total reflection mirror coating is omitted.

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