KR101583823B1 - Light illumination unit and projection light illumination apparatus having thesame - Google Patents

Abstract

Embodiments relate to a lighting unit and a projection-screen lighting apparatus having the same.

The projection-type illumination apparatus according to an embodiment includes first, second, and third light-emitting element arrays for generating light of different wavelengths; First, second and third surface light source parts for guiding light of the respective wavelengths into a surface light source; First, second, and third display panel units for converting the light of the first, second, and third planar light sources into first, second, and third optical signals according to a display image; And a color synthesizing unit synthesizing the first, second, and third optical signals of the first, second, and third display panel units and outputting the synthesized first, second, and third optical signals to a target path.

Projection Young, Lighting, LED

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a lighting unit and a projection-

Embodiments relate to a lighting unit and a projection-screen lighting apparatus having the same.

The projection screen illumination apparatus forms an image on a display panel using light emitted from a light source and enlarges and projects the image on a screen through a projection lens unit. .

As a light source used in the projection-screen illumination apparatus, a lamp is frequently used. However, the lamp is not only bulky but also expensive to manufacture, generates a lot of heat, and has a short life span. Therefore, a projection system is constructed by employing a laser light source or a light emitting diode (hereinafter, LED) instead of a lamp as a light source.

The projection screen illumination apparatus is used as a projection system, mainly for presentation of a conference room, a projector of a theater, and a home theater of a home.

The embodiments provide an illumination unit using a light-emitting element array and a projection-illumination apparatus having the same.

Embodiments provide an illuminating unit and a projection-illumination apparatus including the illuminating unit and the light-guiding plate so as to be formed into a planar light source for each color, synthesize optical signals for respective colors of each panel, .

The projection-type illumination apparatus according to an embodiment includes first, second, and third light-emitting element arrays for generating light of different wavelengths; First, second and third surface light source parts for guiding light of the respective wavelengths into a surface light source; First, second, and third display panel units for converting the light of the first, second, and third planar light sources into first, second, and third optical signals according to a display image; And a color synthesizing unit synthesizing the first, second, and third optical signals of the first, second, and third display panel units and outputting the synthesized first, second, and third optical signals to a target path.

An illumination unit according to an embodiment includes a plurality of rows of first light emitting device arrays including red LEDs of a two-dimensional structure; A plurality of rows of second light emitting device arrays including green LEDs of a two-dimensional structure; A third row of the light emitting device arrays including a blue LED having a two-dimensional structure; A plurality of first, second and third light tunnels respectively corresponding to the rows of the first, second and third light emitting device arrays; And a first, a second, and a third surface light source unit including a multi-layer light guide plate corresponding to the rows of the first, second, and third light tunnels and having a reflection pattern.

The embodiment can provide an illumination system that minimizes light loss using a plurality of LEDs.

Embodiments may not use a mirror, a lens, or the like in the illumination system, thereby lowering the cost of the illumination device.

Since the embodiment places the distance between the transmissive display panel unit and the illuminating unit close to each other, the illuminating lens becomes unnecessary.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a view showing a projection screen illumination apparatus according to an embodiment, FIG. 2 is a detailed view of the illumination unit of FIG. 1, and FIG. 3 is a view showing first and second light guide plates of a surface light source unit. to be.

1, the projection illumination apparatus 100 includes first to third illumination units 101, 102 and 103, first to third display panel units 117, 127 and 137, a color synthesis unit 140, and a projection lens unit 150, .

The first, second, and third illumination units 101, 102, and 103 respectively output light of different wavelengths to the first, second, and third display panel units 117, 127, and 137, respectively, The display panel units 117, 127, and 137 output the first, second, and third optical signals using the light having the wavelength of the incident light according to the image information.

The first, second and third illumination units 101, 102 and 103 include first, second and third light emitting units 110, 120 and 130 and first, second and third surface light source units 115, 125 and 135. The first, second, and third light emitting units 110, 120, and 130 are disposed on the sides of the first, second, and third surface light source units 115, 125, and 135 to emit first, second, and third lights having different wavelengths .

The first, second and third light emitting units 110, 120 and 130 include first, second and third light emitting device arrays 112, 122 and 132 and first, second and third light tunnels 114, So that light of different wavelengths is generated.

Here, the first light emitting device array 112 generates first light, the second light emitting device array 122 generates second light, and the third light emitting device array 132 generates third light . Here, the first light emitting device may be a plurality of red LEDs, the second light emitting device may be a plurality of green LEDs, and the third light emitting device may be a plurality of blue LEDs. Accordingly, the first light, the second light, and the third light may be red light, green light, and blue light.

The first, second, and third light tunnels 114, 124, and 134 are light collecting parts, and direct the distribution of light emitted from the first, second, and third light emitting device arrays 112, 122, and 132 to a distribution within a predetermined angle. Each of the light tunnels 114, 124, and 134 can alleviate the distribution of each light by a predetermined angle distribution, thereby minimizing the light loss and improving the light guide efficiency and uniformity.

The first, second and third surface light source units 115, 125, and 135 guide the first light, the second light, and the third light incident thereinto into the surface light source form to convert the first, second, And irradiated to the panel portions 117, 127, and 137.

The first, second, and third display panel units 117, 127, and 137 are transmissive imagers that are made up of LCD panels. The first, second, and third display panel units 117, 2 and the third optical signal and outputs the converted optical signal.

The first display panel unit 117 is disposed to correspond to the first incident surface 141 of the color combining unit 140 and the second display panel unit 127 is disposed in correspondence with the 2 incident surface 142 and the third display panel portion 137 is disposed to correspond to the third incident surface 143 of the color combining portion 140. [ The first, second, and third display panel units 117, 127, and 137 may be disposed at intervals of 90 degrees around the color composition unit 140.

The color combining unit 140 may be implemented as an X-prism or a dichroic filter. The color combining unit 140 may combine first, second, and third light beams to form an image signal. The color combining unit 140 combines the first, second, and third optical signals to be converted into a destination path, and outputs the combined result.

When the color combining unit 140 is an X-prism, the first optical signal incident on the first incident surface 141 is reflected by the first reflection surface 145 to the emission surface 144, And transmits the second optical signal incident on the second incident surface 142 to the exit surface 144 and transmits the third optical signal incident on the third incident surface 143 to the second reflection surface 146 And reflects it to the exit surface 144. The first reflection surface 145 transmits an optical signal other than the first optical signal, and the second reflection surface 146 transmits a signal other than the third optical signal.

When the color combining unit 140 is a dichroic filter, a first dichroic filter (e.g., area 145) reflects the incident first optical signal and transmits light of a different wavelength, and the second dichroic filter A filter (e.g., area 146) reflects the incident third optical signal and transmits light of other wavelengths. Accordingly, the first, second, and third optical signals incident on the dichroic filter are synthesized and emitted. The dichroic filter may be implemented in a cubic form.

The image signal emitted from the color combining unit 140 is transmitted to the screen by the projection lens unit 150.

The first to third illumination units will be described in detail with reference to FIG.

2, the light emitting device arrays 112, 122, 132 of the light emitting units 110, 120, 130 and the light tunnels 114, 124, 134 are arranged in a plurality of rows. Here, the LEDs of the light emitting device arrays 112, 122, and 132 may be arranged in a two-dimensional structure or a matrix structure, which is a behavior of rows and columns. In addition, the light emitting diodes of each row are one light emitting element array (112, 122, 132), and one light tunnel (114, 124, 134) corresponds to one light emitting element array. The number of the light emitting device arrays 112, 122, and 132 may vary depending on the intensity of the illumination of the projection screen illumination device.

The first, second, and third light tunnels 114, 124, and 134 guide the incident light to a distribution within a predetermined angle (for example, 30 degrees) and enter the first, second, and third surface light sources 115, 125, and 135 . The first, second, and third light tunnels 114, 124, and 134 change the distribution of the incident first, second, and third lights at an angle ranging from 8 to 20 degrees. Here, the light tunnels 114, 124, and 134 may be implemented by lenses other than the optical guide tunnel structure.

The first, second and third planar light sources 115, 125 and 135 may have first and second light guide plates 115A and 115B, a first reflector 115D and a second reflector 115E and a reflective polarizer 115F, .

The first light guide plate 115A and the second light guide plate 115B are adhered in a pair and arranged in a plate form, and the plate form is stacked in a multilayer structure. The pair of first and second light guide plates 115A and 115B correspond to the light tunnels 114, 124, and 134 of the respective rows. Since the light tunnels 114, 124, and 134 transmit the distribution of the light incident on the first and second light guide plates 115A and 115B within a predetermined angle (range of 8 to 20), the light guide efficiency and uniformity are improved You can give.

4 is a graph showing the relationship between the efficiency and the uniformity according to the incident angle of the light guide plate according to the embodiment. As shown in FIG. 4, as the incident angle of light incident on the light guide plate increases, the efficiency increases but the uniformity decreases. At this time, it can be seen that the uniformity is drastically reduced when the light incident angle of the light guide plate is 30 degrees or more. Accordingly, the light tunnel is designed so that the light incident angle of the light guide plate is in a range of 8 to 20 degrees.

A reflection pattern 115C having a predetermined shape is formed on at least one surface of the first and second light guide plates 115A and 115B and the reflection pattern 115C is formed to reflect light traveling inward in a substantially vertical direction For example, a saw-tooth shape or a concavo-convex shape.

3, the reflection pattern 115C is formed on the lower surface of the first light guide plate 115A and the reflection pattern 115C is formed on the upper surface of the second light guide plate 115B. Therefore, The reflection pattern 115C of the first light guide plate 115A and the reflection pattern 115C of the second light guide plate 115B are brought into contact with each other and then brought into contact with each other using an adhesive agent such as silicone or epoxy. Accordingly, since the refractive index n1 of the first light guide plate 115A or the second light guide plate 115B is different from the refractive index n2 of the adhesive C1, And some are reflected in a vertically downward direction or a vertical upward direction.

Some of the light reflected by the first and second light guide plates 115A and 115B travels toward the display panel and some light travels toward the first reflector. A part of the light traveling in the direction of the display panel portion is transmitted through the reflective polarizer 115F to the display panel portions 117, 127 and 137, and the remaining light is reflected by the reflective polarizer 115F and proceeds toward the first reflector do. The first reflection plate 115D reflects the light incident through the light guide plates 115A and 115B and transmits the light toward the display panel, thereby improving the amount of light.

A part of the light transmitted through the light guide plates 115A and 115B is reflected by the second reflection plate 115E and the light reflected by the second reflection plate 115E is reflected by the reflection pattern 115C of the light guide plates 115A and 115B And can proceed toward the display panel portion. At this time, the concave-convex pattern may be formed on the second reflection plate 115E, and the concave-convex pattern changes the critical angle of the reflected light.

Accordingly, the light emitted through the first and second light guide plates 115A and 115B may be provided as a distribution of the surface light source.

The reflective polarizer 115F may include a wave plate (not shown). The wavelength plate may be implemented as a 1/4 wavelength plate, and the 1/4 wavelength plate may be changed by 90 degrees in the polarization direction of light.

A part of the light incident by the light guide plates 115A and 115B passes through the quarter wave plate. At this time, the reflection polarizer 115F transmits the light having passed through the 1/4 wave plate to the reflective polarizer 115F And when the polarization direction of the light having passed through the 1/4 wave plate is perpendicular to the polarization axis of the reflective polarizer 115F, the light is reflected. At this time, the light transmitted through the reflective polarizer 115F is incident on the display panel portion, and the light reflected by the reflective polarizer 115F passes through the quarter-wave plate to become circularly polarized light, Is reflected by the first reflector, passes through the quarter wave plate, and is converted into the same polarization axis as the reflective polarizer 115F. Accordingly, the light transmitted through the reflective polarizer 115F is incident on each of the display panel units 117, 127, and 137.

The first, second, and third passive panel portions 117, 127, and 137 are LCD panels, and first and second polarizers (not shown) may be attached to both sides thereof. The first polarizer corresponds to the reflective polarizer 115F and is formed with the same polarization axis as that of the reflective polarizer 115F so that light transmitted through the reflective polarizer 115F is transmitted through the first polarizer. Accordingly, the first polarizer can be removed.

The first, second, and third display panel units 117, 127, and 137 may operate as normal black or normal white, and form the first, second, and third optical signals according to the display image . That is, the first through third display panel units 117, 127, and 137 output the first through third optical signals.

The first to third optical signals are incident on the incident surfaces 141, 142 and 143 of the color combiner 140 and synthesized into a video signal, and the combined video signal is incident on the projection lens unit 150 through the emission surface . The projection lens unit 150 enlarges and projects the image signal on the screen at a predetermined magnification. The projection lens unit 150 may include an asymmetrical diaphragm.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood that various modifications and applications not illustrated in the drawings are possible.

For example, each component specifically shown in the embodiments of the present invention can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a projection screen illumination apparatus according to an embodiment. FIG.

Fig. 2 is a detailed view of the illumination unit of Fig. 1; Fig.

Fig. 3 is a view showing an adhesion form of the first and second light guide plates of Fig. 2; Fig.

4 is a graph showing the relationship between the efficiency and the uniformity according to the incidence angle of the light guide plate in the embodiment.

Claims (16)

First, second and third light emitting device arrays which generate light of different wavelengths; First, second and third surface light source parts for guiding light of respective wavelengths of the first, second and third light emitting device arrays and converting the light into surface light sources; First, second, and third display panel units for converting the light of the first, second, and third planar light sources into first, second, and third optical signals according to a display image; And a color synthesizing unit for synthesizing the first, second, and third optical signals of the first, second, and third display panel units and outputting the synthesized first, second, and third optical signals to a target path, Wherein the first, second, and third planar light source portions correspond to the first through third light emitting device arrays and are arranged in multiple layers; And a first reflector disposed at a lower portion of the light guide plate arranged in multiple layers; And a second reflector disposed behind the light guide plate arranged in the multi-layered structure. The method according to claim 1, And a plurality of light tunnels or lenses respectively disposed between the first, second, and third light emitting device arrays and the first, second, and third surface light source portions, respectively. 3. The method of claim 2, Wherein the light tunnel causes a distribution of light generated from each light emitting element of the first, second, and third light emitting device arrays to enter the first, second, and third surface light source portions in a critical angle range, Wherein the light tunnel transmits a distribution of the incident light at a critical angle of 8 to 20 degrees. 3. The method according to claim 1 or 2, Wherein the first, second, and third light emitting device arrays include a plurality of red LEDs, green LEDs, and blue LEDs arranged two-dimensionally. The method according to claim 2 or 3, The first, second and third light emitting device arrays are arranged in a plurality of rows, Wherein each of the light tunnels is disposed correspondingly between each row of the first, second and third light emitting device arrays and each layer of the light guide plate. 4. The method according to any one of claims 1 to 3, The first, second, and third planar light source portions include a first light guide plate having a bottom reflection pattern; And a second light guide plate having an upper surface reflection pattern adhered to the reflection pattern of the first light guide plate are arranged in multiple layers in a pair. The method according to claim 6, Wherein a reflection pattern of the first light pipe and a reflection pattern of the second light pipe are adhered with an adhesive. The method according to claim 6, Wherein the reflection patterns of the first and second light guide plates are formed in a concavo-convex pattern or a sawtooth pattern. 4. The method according to any one of claims 1 to 3, And at least one of a quarter wave plate and a reflective polarizer plate on the first, second and third surface light source parts. 4. The method according to any one of claims 1 to 3, Wherein the color synthesizing section includes an X-prism or a dichroic filter. 4. The method according to any one of claims 1 to 3, And a projection lens unit disposed on an emission side of the color combining unit. First, second and third light emitting device arrays which generate light of different wavelengths; First, second and third surface light source parts for guiding light of respective wavelengths of the first, second and third light emitting device arrays and converting the light into surface light sources; First, second, and third display panel units for converting the light of the first, second, and third planar light sources into first, second, and third optical signals according to a display image; And a color synthesizing unit for synthesizing the first, second, and third optical signals of the first, second, and third display panel units and outputting the synthesized first, second, and third optical signals to a target path, Wherein the light tunnel causes a distribution of light generated from each light emitting element of the first, second, and third light emitting device arrays to enter the first, second, and third surface light source portions in a critical angle range, Wherein the light tunnel transmits a distribution of the incident light at a critical angle of 8 to 20 degrees. A plurality of rows of first light emitting device arrays including red LEDs of a two-dimensional structure; A plurality of rows of second light emitting device arrays including green LEDs of a two-dimensional structure; A third row of the light emitting device arrays including a blue LED having a two-dimensional structure; A plurality of first, second and third light tunnels respectively corresponding to the rows of the first, second and third light emitting device arrays; Second, and third surface light source portions including a multi-layer light guide plate having a reflection pattern corresponding to the rows of the first, second, and third light tunnels, Wherein the first, second, and third surface light source units include a first reflector below the light guide plate and a second reflector behind the light guide plate. 14. The method of claim 13, And the first, second, and third light tunnels transmit the distribution of incident light to the light guide plate within 30 degrees. 14. The method of claim 13, Wherein the reflection pattern is disposed on at least one surface of the multi-layer light guide plate, And the reflection patterns disposed on one surface of the multi-layer light guide plate are adhered to each other. 14. The method of claim 13, And at least one of a quarter wave plate and a reflection polarizer plate on the first, second and third surface light source parts.

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