KR102186825B1 - Optical system and image projection device including the same - Google Patents

Abstract

The present invention relates to a light source device and an image projection device including the same. The image projection device adopts an excitation light source to excite a green light source among the three color light sources to increase the amount of light, while limiting the position of the excitation light source and the position of the three-color light source as a premise. The miniaturization of the product of the image projection device is possible, and the minimum excitation by controlling the image size of the green light source formed by the excitation light source by paying attention to the physical quantity of etendue between the display panel and the green light source constituting the illumination system of the image projection device. A sufficient amount of light can be increased even with the amount of light from the light source, so light efficiency can be maximized.

Description

Light source device and image projection device including the same {OPTICAL SYSTEM AND IMAGE PROJECTION DEVICE INCLUDING THE SAME}

The present invention relates to a light source device and an image projection device including the same.

With the rapid development of the information age, the importance of a display device that implements a large screen is being emphasized, and an example of a device that implements a large screen is a projector having a function to enlarge and project an image. As such projectors are gradually becoming smaller and lighter, microscopic image projection devices such as mini projectors and pico projectors are currently being researched and developed.

In this trend, when a light emitting diode (LED) is used as a light source in the light source device of the image projection device 10' using the micro display 350 (MD; Micro Display) as the illumination system 300, Fig. 1 shows. As described above, it is common to include only one red, green, and blue LEDs 111, 112, and 113, respectively. Meanwhile, in order to obtain a larger amount of light than the conventional red, green, and blue LEDs 111, 112, and 113 are used one by one, the green LED 112 recently used in the light source device is an excitation light source such as a blue LED in a green phosphor. There is a trend to have a structure that converts light from a green phosphor to green light by incidence, and an example of a light source device including an excitation light source and an image projection device in the basic light source of red, green, and blue LEDs is disclosed in Korean Patent No. It is disclosed.

2 shows a configuration diagram of an example of a light source device of an image projection device 10" accompanying an excitation light source 114 as in Korean Patent No. 10-1798158. However, as in Korean Patent No. 10-1798158, here When configuring the light source device by adopting the green LED 112 accompanying the light source 114, an increase in the amount of light can be expected, but as shown in FIG. 2, the projection lens unit 400 and the excitation light source 114 Since there is a space (S) that cannot be used between the blue LEDs, there is a limit to the miniaturization of the image projection device 10" by increasing the volume of the light source device. In addition, when the excitation light source 114 is irradiated without considering the image formation size between the display panel 350 and the green light source 112 constituting the illumination system 300, the amount of light of the excitation light source 114 is reduced There is a problem that the overall light efficiency of the projection device 10" is lowered. Therefore, a light projection device employing a light source device including a three-color light source of red, green, and blue, and an excitation light source 114 for exciting the green light source. The necessity of product miniaturization and improvement of light efficiency in the market still exists.

Korean Patent No. 10-1798158

An object of the present invention is to provide a light source device that is advantageous in product miniaturization and has excellent light efficiency and an image projection device including the same, while attempting to increase the amount of light by configuring a light source device including an excitation light source.

The present invention has been made as a result of careful examination in order to solve the above-described problems, and while attempting to increase the amount of light by adopting an excitation light source to excite a green light source among three color light sources, the position of the excitation light source and a three-color light source based on this While finding that miniaturization of the entire product of the light source device and the image projection device is possible by limiting the location of the image projection device, pay attention to the physical quantity of etendue between the display panel and the green light source constituting the illumination system of the image projection device, and use this as a reference In the case of controlling the image formation size for the green light source formed by the light source, it is possible to achieve sufficient increase in the amount of light even with the minimum amount of excitation light source, so that the light efficiency can be improved, and the related light source device and the light projection device including the same The present invention has been reached by further specifying the optical design for. The gist of the present invention based on the above knowledge and focus and the recognition of the problem of the present invention is the same as described in the claims below.

(1) a light source device including a red, green, and blue three-color light source, and an excitation light source for exciting the green light source; A color combination unit including a plurality of dichroic mirrors; An illumination system including a display panel; And a projection lens unit, wherein when the three-color light source is configured as a combination of a first light source module, a second light source module, and a third light source module, the second light source module and the third light source module The pair is arranged in parallel on the opposite side of the illumination system with the color combination portion therebetween; The first light source module and the excitation light source are disposed to face each other with the color combination part therebetween, and are disposed perpendicular to a light irradiation direction by the second light source module and the third light source module; The third light source module is disposed closer to the excitation light source than the first light source module and the second light source module, and the color combination unit includes A light projection device, characterized in that controlling to selectively excite a light source module constituting a green light source among one light source module, a second light source module, or a third light source module.

(2) The light projection device of (1), wherein the third light source module is a green light source.

(3) The light projection apparatus of (1), wherein either the first light source module or the second light source module is a green light source, and the third light source module is a blue light source.

(4) As the virtual size of the green light source, the size at which etendue matching occurs in relation to the display panel is set to a first size, and the image size formed on the green light source when light is irradiated from the excitation light source is set to a second size. When in size; Any one of the above (1) to (3), further comprising an optical correction means provided in an optical path between the green light source and the excitation light source and matching the second size to the first size. Light projection device.

(5) When the first size is the same as the actual size of the green light source, the optical correction means is a magnification lens.

(6) When the shape and size of the green light source and the excitation light source are the same, the optical correction means is a 1:1: imaging lens.

(7) When the first size is different from the actual size of the green light source, the optical correction means is one of an asymmetric lens, a fly eye lens (FEL), a light tunnel, or a rod lens. The light projection apparatus of (4), comprising at least one.

According to the present invention, it is possible to significantly reduce the size of the light source device and the image projection device product by adjusting the position of the three-color light source and the excitation light source while increasing the amount of light using the excitation light source, and the display panel and the green light source constituting the illumination system. Light of the excitation light source for a green light source by using optical correction means including an asymmetric lens, a fly eye lens (FEL), a light tunnel, or a rod lens, taking into account the size of the inter-image By controlling the irradiation profile, the light efficiency of the light source device can be maximized.

1 is a configuration diagram of a light source device of a conventional general image projection device.
2 is a configuration diagram of a light source device of a conventional image projection apparatus accompanying an excitation light source.
3 to 6 are schematic diagrams for explaining a specific process of an excitation light source in an image projection apparatus light source device according to an embodiment of the present invention.
7 and 8 are configuration diagrams of an image projection apparatus having an arrangement structure in which an excitation light source and a green light source face each other according to an embodiment of the present invention.
9 and 10 are configuration diagrams of an image projection apparatus having an arrangement structure in which an excitation light source and a green light source are adjacent to each other according to an embodiment of the present invention.
11 and 12 are configuration diagrams of an image projection apparatus in which an excitation light source and a green light source have an arrangement structure other than those of FIGS. 7 to 15 according to an embodiment of the present invention.
In the image projection apparatus according to the arrangement of the green LED 3 color light source having a structure other than FIGS. 7 to 10.
13 is a schematic diagram of definition of etendue.
14 is a diagram of etendue physical quantities.
15 is an exemplary diagram of etendue matching between a display device and a light source.
16 is a schematic diagram of an imaging optical system including an imaging lens when matching a display panel and etendue based on an actual size of a green light source.
17 is an example of applying the imaging optical system of FIG. 16 to the light projection device of FIG. 12 according to an embodiment of the present invention.
18 is an exemplary diagram illustrating a case in which etendue matching with a display panel is not performed based on an actual size of a green light source.
19 is a schematic diagram of an imaging optical system including an asymmetric imaging lens when etendue mismatch between a display panel and a green light source.
20 is an example of applying the imaging optical system of FIG. 19 to the light projection device of FIG. 9 according to an embodiment of the present invention.
21 is a schematic diagram of an imaging optical system including a fly eye lens (FEL) when etendue is not matched between a display panel and a green light source.
22 is an example of applying the imaging optical system of FIG. 21 to the light projection device of FIG. 9 according to an embodiment of the present invention.
23 is a photograph of a light tunnel or a rod lens constituting an imaging optical system when etendue is not matched between a display panel and a green light source.
24 is an example of applying an imaging optical system including a light tunnel or a rod lens of FIG. 23 to the light projection device of FIG. 9 according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same or similar reference numbers are assigned to the same or equivalent. In addition, throughout the specification, when a certain part'includes' a certain element, this means that other elements may be further included rather than excluding other elements unless otherwise stated. In addition, when it is said that a certain component is provided, provided, or included'optionally', it is not an essential component for the solution of the present invention, but can be arbitrarily adopted with such a problem and reliability. it means.

[Basic configuration of the image projection device 10]

The image projection apparatus 10 according to the present invention has a light source device, a color combination unit 200, an illumination system 300, and a projection lens unit 400 as a basic configuration. Hereinafter, each component will be described.

The light source device includes red, green, and blue three-color light sources 111, 112, and 113 for color realization as a basic light source, and may preferably be a light emitting diode (LED). Each of these three-color light sources 111, 112, and 113 is composed of a combination allocated to the first light source module 121, the second light source module 122, and the third light source module 123 in terms of their arrangement position. Meanwhile, the green light source 112 has a structure in which a green phosphor is excited by the external excitation light source 114 to emit green light. The excitation light source 114 may be a blue LED, and is provided integrally on the rear surface of the phosphor substrate of the green light source 112 or manufactured as a separate module, that is, an excitation light source 114 to irradiate excitation light to the phosphor substrate from the outside. It can be a form. As will be described later, one of the features of the present invention relates to reducing the size of the light source device and the entire image projection device 10 including the light source device in the case of configuring the separate excitation light source 114 as a part of the light source device. . Meanwhile, in the present specification, the green light source 112 has been described as referring to a green phosphor or its substrate in some cases.

The color combination unit 200 is a means for combining at least two or more colors, and is disposed between the lighting system 300 including an image conversion device such as a display panel 350 and the light source device to be emitted from the light source device. It serves to combine and transmit the image to the image change device 250 of the illumination system (300). The light emitted to the illumination system 300 through the color combination unit 200 may be colored light or white light in which two or more different colors are combined, and is allocated to the plurality of light source modules 121, 122, 123 and arranged in combination. Light irradiated from the three-color light sources 111, 112, and 113 may be cross-output light over time. The color combination unit 200 may include at least two or more dichroic mirrors 210 and 220, and the dichroic mirrors 210 and 220 are basically the first light source module 121 and the second light source module. 122) and the third light source module 123, depending on the type of the red light source 111, green light source 112, and blue light source 113, some colors are reflected and some colors are selectively transmitted. In addition, whether the light emitted from the external excitation light source 114 is reflected or transmitted to the green light source 112 must be considered.

The illumination system 300 may include an image conversion device 350, and may be configured to form an image using light incident from the light source device. In this case, the image conversion device 350 may change or color-separate light incident from the light source device, for example, and may convert the light into an image using a display device. The image conversion device 350 may use various methods to impart an image to light, for example, a reflective display panel 350 (LCOS, etc.), a T overtype display panel 350 (HTPS-LCD, etc.), and Any one of the DLP (Digital Light Process) display panels can be used. Meanwhile, in the embodiment of the present invention, a single tube display panel 350 that temporally synthesizes light through a time ratio of a red light source irradiated in the same direction through the color combination unit 200 and green and blue is used. An example is shown.

On the other hand, the illumination system 300 may include a fly's eye array (FEA: Fly's Eye Array) for improving the illuminance and color homogeneity of the light emitted from the color combination unit 200, and also reflective to the image conversion device. When the display panel 350 is used, a polarization conversion device such as a polarization beam splitter array may be provided to reduce light loss. Accordingly, the illumination system 300 transmits the light emitted from the polarization beam splitter array to the reflective display panel 350 and enters light having an image formed by the reflective display panel 350 to enter the projection lens unit ( 400) may further include a polarization beam splitter cube for reflection. Meanwhile, in the case of the DMD of the reflective display panel 350, since polarization is not used, a polarization beam splitter array is not used, and only a fly eye array may be included. The beam splitter cube can be replaced with a Total Internal Reflection Prism that separates the path of the beam according to the angle.

The projection lens unit 400 serves to enlarge and project an image incident from the illumination system 300, specifically, a polarization beam splitter or a total internal reflection prism, to an external screen.

[3-color light source (111, 112, 113) and Of the excitation light source 114 Placement location specific; Increased light intensity & minimized product]

In the present invention, in the case of adopting the external excitation light source 114 for the green light source 112 among the three color light sources 111, 112, 113 for the purpose of increasing the amount of light, the three color light source 111 constituting the light source device One of the features is that the positions of the 112 and 113 and the excitation light source 114 are allocated to specific positions for miniaturization of the entire product of the light source device and the image projection device 10. That is, the positions of the three-color light sources 111, 112, and 113 and the excitation light source 114 eliminate the space (S) that cannot be used between the projection lens unit 400 and the excitation light source 114 shown in FIG. In terms of utilizing the product miniaturization, the color combination unit 200 and the lighting system 300 including the display panel 350 may be relatively determined and described in terms of an arrangement relationship.

Specifically, when the first light source module 121, the second light source module 122, and the third light source module 123 are viewed as positions around the color combination unit 200 and the illumination system 300, the three-color light source 111 Each of the, 112 and 113 may be basically combined in a form allocated to positions of the first light source module 121, the second light source module 122, and the third light source module 123 as described above. In this case, the pair of the second light source module 122 and the third light source module 123 are elements arranged in parallel on the opposite side of the illumination system 300 with the color combination unit 200 interposed therebetween. The first light source module 121 and the excitation light source 114 are disposed to face each other with the color combination unit 200 interposed therebetween, and the light irradiation direction by the first light source module 121 and the excitation light source 114 The second light source module 122 and the third light source module 123 are arranged to be perpendicular to the light irradiation direction. In the drawings according to the embodiment, the excitation light source 114 is disposed below the color combination unit 200, and accordingly, the third light source module 123 is the first light source module 121 and the second light source module. It is disposed closer to the excitation light source 114 than 122.

On the other hand, the color combination unit 200, in a state in which the light irradiated from the excitation light source 114 is not incident to the illumination system 300, the first light source module 121, the second light source module 122, or Among the third light source modules 123, the light source modules constituting the green light source 112 are controlled to be selectively excited, and this control process includes a plurality of dichroic mirrors 210 and 220 provided in the color combination unit 200. Can be achieved by It will be described in more detail below based on the related drawings.

Of the excitation light source 114 Placement location

3 to 6 are schematic diagrams for explaining a process of specifying an arrangement position of the excitation light source 114 in the light source device of the image projection apparatus 10 according to an embodiment of the present invention.

3 , in the light projection device 10" having the same three-color light source 111, 112, 113 arrangement position as shown in FIG. 2, the three-color light source 111, 112, 113 In order to reduce the size, the optical element of the'area A'is rotated 90 degrees around the red reflective dichroic mirror 220' constituting the color combination unit 200. In this way, to reduce the size of the light source device, the red reflective dichroism when the optical element of the region a '' around the castle mirror 220 'to be rotated 90 degrees, the projection lens unit 400 and the excitation light source 114 as shown in Figure 4 of the blue LED portion is spatial interference There is a problem that occurs . Referring to 5, it is shown in FIG. 5 as a space capable of avoiding spatial interference and reducing the overall size of the optical system while configuring a light source device including the three-color light sources 111, 112, and 113 and the excitation light source 114. As described above, it may be considered to check'area B'and use it as a space in which the excitation light source 114 is arranged.

On the other hand, the blue light emitted from the excitation light source 114 is additionally used for the purpose of increasing the excitation light energy input to the green phosphor in order to increase the amount of green light in the optical system, so only the phosphor of the green light source 112 must be incident light. And, it should not be incident on the display panel 350 of the illumination system 300. This condition may be controlled by the first dichroic mirror 210 and the second dichroic mirror 220 provided in the color combination unit 200. Specifically, the blue light emitted from the excitation light source 114 disposed in the'region B'of FIG. 5 is 3 as shown in FIG . 6 by the first dichroic mirror 210 and the second dichroic mirror 220 . The color light source 111, 112, 113 may be controlled by any one of three light paths toward the first light source module 121, the second light source module 122, or the third light source module 123, The light emitted from the excitation light source 114 is not irradiated to the display panel 350 of the illumination system 300. The actual control path of the light emitted from the excitation light source 114 becomes a light source module in which the green light source 112 is disposed among the first light source module 121, the second light source module 122, or the third light source module 123. .

As a result, when the arrangement position of the excitation light source 114 is selected as'area B'in FIG. 5, the space utilization of the light source device can be maximized, and in this case, the first dichroic mirror of the color combination unit 200 ( 210) and the second dichroic mirror 220 by controlling the optical path of the excitation light source 114, the arrangement of the green light source 112 in a state in which light is not irradiated to the display panel 350 of the illumination system 300 Light can be selectively irradiated to any one of the first light source module 121, the second light source module 122, and the third light source module 123 assigned to the position.

Arrangement position of the three-color light sources 111, 112, 113

Next, as described above, the three-color light sources 111, 112, and 113 are used as the first light source module 121, the second light source module 122, and the third light source module in a state in which the arrangement value of the excitation light source 114 is specified. The case where it is placed in (123) will be described in detail.

① When the green light source 112 is assigned to the first light source module 121 (opposite to the excitation light source 114)

7 and 8 show a configuration diagram of an image projection apparatus 10 having an arrangement structure in which the excitation light source 114 and the green light source 112 face each other according to an embodiment of the present invention. That is, the green light source 112 is allocated to the first light source module 121, and the excitation light source 114 is illustrated as a blue LED.

As shown in FIG. 7, when the green light source 112 and the excitation light source 114 face each other and the red light source 111 is allocated to the third light source module 123 and is adjacent to the excitation light source 114, color adjustment The negative second dichroic mirror 220 should be selected to reflect the light of the blue light source 113 allocated to the second light source module 122 to be directed to the display panel 350 of the illumination system 300. In this case, since the blue light for the excitation light source 114 having the same wavelength range is also reflected by the second dichroic mirror 220, the excitation effect for the green light source 112 allocated to the first light source module 121 and accordingly The effect of increasing the amount of light cannot be expected.

Meanwhile, as shown in FIG. 8, when the green light source 112 and the excitation light source 114 face each other and the blue light source 113 is allocated to the third light source module and is adjacent to the excitation light source 114, the first dichroic By selecting the mirror 210 to reflect red and transmit blue and green, while selecting the second dichroic mirror 220 to reflect red and green and transmit blue, light irradiated from the three-color light sources 111, 112, 113 While inducing to the display panel 350 of the illumination system 300, an effect of increasing the amount of light of the excitation light source 114 for the green light source 112 may be achieved.

As a result, when the green light source 112 is assigned to the first light source module 121, the third light source module 123 adjacent to the excitation light source 114 must be assigned as the blue light source 113 to the excitation light source 114 It may have an effect of increasing the amount of light by

② When the green light source 112 is assigned to the third light source module 123 (adjacent to the excitation light source 114)

9 and 10 show a configuration diagram of an image projection apparatus 10 having an arrangement structure in which the excitation light source 114 and the green light source 112 are adjacent to each other according to an embodiment of the present invention. That is, the green light source 112 is allocated to the third light source module 123, and the excitation light source 114 is illustrated as a blue LED.

9, the green light source 112 and the excitation light source 114 are adjacent to each other, and the red light source 111 is in the first light source module 121 and the blue light source 113 is in the second light source module 122. When assigned respectively, by selecting the first dichroic mirror 210 to reflect blue and transmit red, while selecting the second dichroic mirror 220 to reflect blue and red and transmit green, the three-color light sources 111, 112, The light irradiated from 113 can be guided to the display panel 350 of the illumination system 300 and at the same time, an effect of increasing the amount of light of the excitation light source 114 with respect to the green light source 112 can be achieved.

In addition, as shown in FIG. 10, the green light source 112 and the excitation light source 114 are adjacent to each other, and the red light source 111 is the second light source module 122 and the blue light source 113 is the first light source module 121. When each is assigned to, the first dichroic mirror 210 is selected to reflect red and transmit blue, while the second dichroic mirror 220 is selected to reflect blue and red and transmit green, so that the three-color light sources 111 and 112 The light irradiated from the light source 113 can be guided to the display panel 350 of the illumination system 300 and at the same time, an effect of increasing the amount of light of the excitation light source 114 for the green light source 112 can be achieved.

As a result, when the green light source 112 module is assigned to the third light source module 123, the remaining red light source 111 and the blue light source 113 are the first light source module 121 or the second light source module 122 Regardless of which location is disposed, the excitation light source 114 may increase the amount of light.

③ When the green light source 112 is assigned to the second light source module 122 (not facing or adjacent to the excitation light source 114)

11 and 12 show a configuration diagram of an image projection apparatus 10 having an arrangement structure of the excitation light source 114 and the green light source 112 other than those of FIGS. 7 to 15 according to an exemplary embodiment of the present invention. That is, the green light source 112 is allocated to the second light source module 122, and the excitation light source 114 is illustrated as a blue LED.

As shown in FIG. 11, when the green light source 112 is not opposite or adjacent to the excitation light source 114 and the red light source 111 is allocated to the third light source module 123 and is adjacent to the excitation light source 114 , The second dichroic mirror 220 of the color control unit should be selected to reflect the light of the blue light source 113 allocated to the first light source module 121 to be directed to the display panel 350 of the illumination system 300. In this case, since the blue light for the excitation light source 114 having the same wavelength range is also reflected by the second dichroic mirror 220, the excitation effect for the green light source 112 allocated to the second light source module 122 and accordingly The effect of increasing the amount of light cannot be expected.

Meanwhile, as shown in FIG. 12, the green light source 112 is not opposite or adjacent to the excitation light source 114, and the blue light source 113 is allocated to the third light source module 123 to be adjacent to the excitation light source 114. Then, by selecting the first dichroic mirror 210 to reflect green and blue and transmit red, while selecting the second dichroic mirror 220 to reflect red and green and transmit blue, the three-color light sources 111 and 112, The light irradiated from 113 can be guided to the display panel 350 of the illumination system 300 and at the same time, an effect of increasing the amount of light of the excitation light source 114 with respect to the green light source 112 can be achieved.

As a result, when the green light source 112 is assigned to the second light source module 122, the third light source module 123 adjacent to the excitation light source 114 is similar to the case of ① above, as the blue light source 113. It must be allocated to have an effect of increasing the amount of light by the excitation light source 114.

Summarizing the matters related to the arrangement position of the three-color light sources 111, 112, and 113 according to the above ① to ③, the arrangement position of the excitation light source 114 is specified at the bottom of the color control unit to minimize the size of the light source device. In order to achieve the effect of increasing the amount of light in, when the green light source 112 is allocated to the third light source module 123 and is disposed adjacent to the excitation light source 114, the blue light source 113 and the green light source 112 are It does not matter whether it is disposed in either the 1 light source module 121 or the second light source module 122, but when the green light source 112 is assigned to the first light source module 121 or the second light source module 122, the blue light source (113) is allocated to the third light source module 123 and has a structural feature that must be disposed adjacent to the excitation light source 114.

[ Of the excitation light source 114 Light irradiation Adjustment of the profile; Light efficiency Growth ]

Another feature of the present invention is to increase light efficiency by adjusting the light irradiation profile for the green light source 112 of the excitation light source 114 in addition to minimizing the product by the arrangement structure of the light source device described above. The control of the light irradiation profile is based on the green light source 112 formed by the excitation light source 114 by paying attention to the etendue physical quantity between the display panel 350 and the green light source 112 constituting the illumination system 300. ) Is performed by controlling the size of the image formation using the optical correction means.

Specifically, as the virtual size of the green light source 112, the size at which etendue matching occurs in relation to the display panel 350 of the illumination system 300 is set as the first size. Next, when the size of an image formed on the green light source 112 when irradiated with light from the excitation light source 114 is set to the second size, the second size is matched to the first size using an optical correction means. In this case, the light correction means is provided between the green light source 112 and the excitation light source 114.

It will be described in more detail below based on the related drawings.

Of Etendue Definition and calculation

The etendue is a measure representing the physical characteristics of the received light amount of the light receiving unit in an optical system having a light emitting unit and a light receiving unit. For example, in the case of a Lambertian light source having the same emission luminance in all directions as shown in FIG. 13, the emission characteristic is uniformly emitted from the emission surface, and an ideal optical system with a light transmission efficiency of 100% is assumed. The amount of light of the light-receiving unit is the same as the amount of light of the light source without loss of the low light amount. This etendue is a pure geometric physical quantity that can be expressed according to FIG. 14, and if the energy of a display device is known, the etendue of a light source can be known. That is, the size of the light source most suitable for this can be calculated through the calculation of the etendue of the display device. FIG. 15 shows etendue matching between a display device and a light source, and if there is a relationship that satisfies the equation of FIG. In this case, the equation of FIG. 15 calculates a case in which the display device panel is not inclined and can receive all the light emitted from the LED light source.

Based on the actual size of the green light source 112, the display panel 350 and the Etendue Matching If made

16 shows a schematic diagram of an imaging optical system 500 provided between the green light source 112 and the excitation light source 114 when etendue is matched between the display panel 350 of the illumination system 300 and the green light source 112 . That is, in FIG. 16, on the assumption that etendue matching occurs in relation to the display panel 350 of the illumination system 300 based on the actual size of the green light source 112, the green light source 112 and the excitation light source 114 It shows an imaging optical system 500 including an optical correction means in the form of an imaging lens provided therebetween.

Meanwhile, in general, the green light source 112 and the blue LED for the excitation light source 114 have the same chip size. In this case, the imaging optical system 500 illustrated in FIG. 16 is a 1:1 imaging lens 510 (Collimation). Lens) may be an imaging optical system 500 adopting the optical correction means. Accordingly, the image formation size of the light irradiated from the excitation light source 114 is the same as the actual size of the green light source 112. On the other hand, when the shape of the chip of the green light source 112 and the blue LED for the excitation light source 114 is the same but the chip size is different, the imaging lens may be a magnification lens as an optical correction means adopted in the imaging optical system 500. have.

FIG. 17 shows a specific example of applying the imaging optical system 500 of FIG. 15 to the light projection device of FIG. 12 according to the present invention when etendue matching between the display panel 350 and the green light source 112 is applied. In 17, an imaging optical system 500 including a 1:1 imaging lens 510 as an optical correction means provided between the green light source 112 and the excitation light source 114 is indicated as'area C'. The imaging optical system 500 including the 1:1 imaging lens 510 of FIG. 17 may be applied with the same principle to the optical projection devices of FIGS. 8 to 10 described above.

Based on the actual size of the green light source 112, the display panel 350 and the Etendue No matching If not

18 illustrates an exemplary diagram when etendue matching with the display panel 350 is not performed based on the actual size of the green light source 112. In the drawing,'area D'represents a virtual size in which etendue matching with the display panel 350 is performed. Therefore, even if light is irradiated over the entire actual size of the green light source 112, the light irradiated outside the'area D'cannot be utilized by the display panel 350. Therefore, in order to prevent such loss and increase light efficiency, the green light source The light emitting area at 112 needs to be limited to'area D'. That is, it is advantageous in terms of light efficiency to limit the image formation size of the excitation light source 114 with respect to the green light source 112 to'area D'by a separate optical correction means provided therebetween.

In this case, the light correction means for adjusting the light irradiation profile for the green light source 112 of the excitation light source 114 is, for example, (i) an asymmetric lens 520 having different powers in the horizontal direction and the vertical direction. And a different magnification, or (ii) an intergrator such as a fly eye lens 530 (FEL), a light tunnel, or a rod lens A method of changing the shape to be formed by using can be adopted.

Specifically, FIG. 19 shows a schematic diagram of an imaging optical system 500 including an asymmetric lens 520 when etendue mismatch, and etendue matching between the actual size of the green light source 112 and the display panel 350 is not complete. If not, the image formation size for the green light source 112 is optimized by varying the power in the horizontal direction and the vertical direction. FIG. 20 shows a specific example of applying the imaging optical system 500 of FIG. 19 to the light projection device of FIG. 9 according to the present invention when etendue is not matched between the display panel 350 and the green light source 112, and FIG. In 20, an imaging optical system 500 including an asymmetric imaging lens as an optical correction means provided between the green light source 112 and the excitation light source 114 is denoted as'area E'.

FIG. 21 shows a schematic diagram of light profile control by the fly-eye lens 530 (FEL) when etendue is not matched between the display panel 350 and the green light source 112. When the etendue match between the actual size of the green light source 112 and the display panel 350 is not complete, the light emitted from the excitation light source 114 passes through the FEL and changes the shape of the image formed on the green light source 112. do. This is to use that when the length of one cell of the fly-eye lens 530 (FEL) is different in the horizontal direction and the vertical direction, the shape formed by the green light source 112 is the same. 22 shows a specific example of applying the imaging optical system 500 of FIG. 21 to the light projection device of FIG. 9 according to the present invention when etendue is not matched between the display panel 350 and the green light source 112, and FIG. In 22, the imaging optical system 500 including the fly-eye lens 530 (FEL) as an optical correction means provided between the green light source 112 and the excitation light source 114 is indicated as'area F'.

23 illustrates a photo of a light tunnel or a rod lens constituting the imaging optical system 500 when etendue is not matched between the display panel 350 and the green light source 112. When etendue matching between the actual size of the green light source 112 and the display panel 350 is not complete, a light tunnel or rod lens 540 is placed at the exit end of the excitation light source 114. By providing the green light source 112 to form an image. In this case, if the shape of the exit end of the light tunnel or the rod lens 540 is different in the horizontal direction and the vertical direction, the shape of the image formation in the green light source 112 is the same. FIG. 24 shows an example in which an imaging optical system 500 including a light tunnel or rod lens 540 of FIG. 23 is applied to the light projection device of FIG. 9 according to an embodiment of the present invention. , In FIG. 24, an imaging optical system 500 including a light tunnel or a rod lens as an optical correction means provided between the green light source 112 and the excitation light source 114 is'area It is marked with G'.

Meanwhile, the imaging optical system 500 including the asymmetric imaging lens of FIG. 20, the imaging optical system 500 including the fly-eye lens 530 (FEL) of FIG. 22, and a light tunnel or rod of FIG. 24 The imaging optical system 500 including a lens 540 (rod lens) has been illustrated for the image projection apparatus 10 according to FIG. 9 according to the embodiment of the present invention, but FIGS. 8 and 10 are other embodiments of the present invention. And the same principle can be applied to the light projection device of FIG. 12.

As described above, according to the present invention, the light source device and the image projection device 10 are controlled by adjusting the positions of the three-color light sources 111, 112, 113 and the excitation light source 114 while increasing the amount of light using the excitation light source 114. The size of the product can be significantly reduced, and in consideration of the image formation size between the display panel 350 and the green light source 112 constituting the illumination system 300, the asymmetric lens 520 and the fly eye lens 530 (FEL; Fly A light source device by controlling the light irradiation profile of the excitation light source 114 for the green light source 112 using a light correction means including an eye lens, a light tunnel, or a rod lens. Can maximize the light efficiency.

The above description relates to specific embodiments of the present invention, but the above embodiments according to the present invention are disclosed for the purpose of explanation and are not understood to limit the scope of the present invention, and those skilled in the art It should be understood that various changes and modifications can be made to the disclosed embodiments without departing from the essence of the present invention. Accordingly, all such modifications and changes may be understood to correspond to the scope of the invention disclosed in the claims or their equivalents.

10: image projection device
111: red light source
112: green light source
113: blue light source
114: excitation light source
121: first light source module
122: second light source module
123: third light source module
200: color combination unit
210: first dichroic mirror
220: second dichroic mirror
300: illumination system
350: image conversion device, display panel
400: projection lens unit
500: imaging optical system
510: 1-to-1 imaging lens
520: asymmetric lens
530: fly eye lens
540: light tunnel or rod lens

Claims (7)

A light source device including a three-color light source of red, green, and blue, and an excitation light source for exciting the green light source; A color combination unit including a plurality of dichroic mirrors; An illumination system including a display panel; And a projection lens unit, wherein the three-color light source comprises a combination of a first light source module, a second light source module, and a third light source module,
The second light source module and the third light source module pair are disposed in parallel on the opposite side of the illumination system with the color combination part therebetween; The first light source module and the excitation light source are disposed to face each other with the color combination part therebetween, and are disposed perpendicular to the light irradiation direction by the second light source module and the third light source module; The third light source module is disposed closer to the excitation light source than the first light source module and the second light source module,
The color combination unit selectively excites a light source module constituting a green light source among the first light source module, the second light source module, or the third light source module in a state in which light irradiated from the excitation light source is not incident to the illumination system. To control it,
As the virtual size of the green light source, the size at which etendue matching occurs in relation to the display panel is set as the first size, and the image formation size formed on the green light source when irradiated with light from the excitation light source is set as the second size. time; And an optical correction means provided in an optical path between the green light source and the excitation light source and configured to match the second size with the first size. The light projection apparatus according to claim 1, wherein the third light source module is a green light source. The light projection apparatus according to claim 1, wherein either the first light source module or the second light source module is a green light source, and the third light source module is a blue light source. delete The optical projection apparatus according to claim 1, wherein when the first size is the same as the actual size of the green light source, the optical correction means is a magnification lens. The light projection apparatus according to claim 5, wherein when the green light source and the excitation light source have the same shape and size, the light correction means is a 1:1: imaging lens. The method of claim 1, wherein when the first size is different from the actual size of the green light source, the optical correction means is an asymmetric lens, a fly eye lens (FEL), a light tunnel, or a rod lens. lens), characterized in that it comprises at least one of.

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