CN1979333A - Lighting device and projection system using the lighting device - Google Patents

Abstract

An illumination device and a projection system using the same. The lighting device comprises a plurality of light source modules and a multi-channel light integration tube. The multi-channel light integrating tube is provided with a plurality of light channels, each light channel is provided with a light source light guide part, and each light channel corresponds to one light source module. The light source module transmits the light output by the light source module to the corresponding light channel, and the light source light guide part of each light channel is provided with a reflecting surface for collecting the light sources input by the light channels into the multi-channel light integrating tube so as to provide the output of the lighting device.

Description

Lighting device and projection system using the lighting device

technical field

The invention relates to an illumination device and a projection system, and in particular to an illumination device and a projection system with multiple light source channels.

Background technique

Portable pico projectors are bound to become the mainstream trend in the personal digital market in the future, but they must be matched with low-cost and effective optical engines. General light emitting diode (Light Emitting Diode, hereinafter referred to as "LED") projectors are used in a way that a group of LED arrays are arranged to increase the required total lumens (Luminance), thereby increasing the projected brightness. For example, referring to FIG. 1 , in US Patent Application Publication No. 2003/0147055, LED arrays are used to increase the total lumens and average brightness. As shown in the figure, the lighting device 100 includes an LED array 120 composed of a plurality of light emitting diode units 110 . The light is sent through a light guide block (Light Guide Block) 130 . On the inner side of the light guiding block 130 , a plurality of sidewalls 135 with reflective surfaces are used to reflect and output the light.

In addition, in the Taiwan Patent No. 88100890 application filed by the same applicant as this case, the light sources are also arranged in an array, please refer to FIG. 2A and FIG. 2B . The proposed lighting device includes a light source 200 , a wedge-shaped glass column array 210 , a wedge-shaped glass column 220 and a light valve (light valve) 230 . The light source 200 is an array composed of a plurality of light emitting modules 202 . The wedge-shaped glass column array 210 is composed of a plurality of wedge-shaped glass columns 212, each wedge-shaped glass column 212 has a first end 212a and a second end 212b, wherein the first end 212a of each wedge-shaped glass column 212 is in close contact with each light emitting module, It is used to collect the large-angle light beams emitted by each light emitting module, and convert the light emitted by the light source 200 into small-angle light, and emit uniform light from the second end 212b of each wedge-shaped glass column 212 . The wedge-shaped glass column 220 has a first end 220a and a second end 220b, and the first end 220a is used to receive the homogenized light emitted by the wedge-shaped glass column array 210 and overlap it evenly on the light valve (light valve). 230 on. This architecture can increase the brightness of the overall output light source.

However, if the above-mentioned lighting device is used in a miniature lighting device, especially a portable micro-projector, the volume will be too large to be suitable for miniaturization. In addition, the problem of heat dissipation is difficult to overcome, which shortens the life of the light source.

Contents of the invention

The present invention is to provide a portable miniature lighting device, which can effectively reduce the volume, has better heat dissipation effect, and can increase the lifespan of the light source.

An embodiment of the lighting device proposed by the present invention includes a plurality of light source modules and a multi-channel optical light tube. Wherein the multi-channel light integrator has multiple light channels, each light channel has its light source light guide part, and each light channel corresponds to one of the light source modules. The light source module transmits the output light to the corresponding light channel, and the light guide part of each light channel has a reflective surface, which is used to integrate the light sources input through these light channels into a multi-channel light integration tube, and accordingly provide the output of the lighting device.

The lighting device above also includes a lens group for performing light refraction or scattering processing on the light output by the multi-channel light integrator.

In the above lighting device, the sum of the luminous flux areas of the light channels is equal to the luminous flux area in the multi-channel light integrating tube.

In the above lighting device, the surface of the light guide part of the light source is designed as a curved surface or an arc surface.

In the lighting device above, the light source modules provide different combinations of light sources to adjust the light components output by the lighting device.

In the aforementioned lighting device, the light emitting diode (Light Emitting Diode) light source module may be an array composed of a plurality of red (R), green (G) and blue (B) light emitting diodes. Or an array of multiple single-color or white LEDs.

In the lighting device above, the light source modules may be organic light emitting diode light source modules, laser diode light source modules, electroluminescence element light source modules, field emission display light source modules or cold cathode fluorescent lamp light source modules.

In the above lighting device, the multi-channel light integrator includes heat dissipation fins for heat dissipation.

The invention proposes a projection system according to an embodiment, including an illumination device and an image generating module. The lighting device includes a plurality of light source modules and a multi-channel light integrator. Wherein the multi-channel light integrator has multiple light channels, each light channel has its light source light guide part, and each light channel corresponds to one of the light source modules. The light source module transmits the output light to the corresponding light channel, and the light guide part of each light channel has a reflective surface, which is used to integrate the light sources input through these light channels into a multi-channel light integration tube, and accordingly provide the output of the lighting device. The image generation module uses the light generated by the lighting device to generate a corresponding image according to the source of the image signal.

The projection system above also includes a heat dissipation device, wherein the illuminating device can dissipate heat through the heat dissipation device.

The above-mentioned projection system may be a liquid crystal display (LCD) projection device, a single or three-sided liquid crystal silicon panel (LCOS) projection device, or a digital optical processing (DLP) projection device.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are described below in detail with accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram illustrating the arrangement and placement of LEDs in a conventional LED projector.

FIG. 2A and FIG. 2B illustrate a lighting device in which conventional light sources are arranged in an array.

FIG. 3A illustrates an illumination device applied to an LED projector according to an embodiment of the present invention.

FIG. 3B is a schematic diagram of components illustrating a preferred embodiment of the lighting device of the LED projector shown in FIG. 3A .

FIG. 4A is a schematic diagram illustrating the combination of light sources received by the light tube inside the integrating tube main body of the integrating tube main body through the cross-section between the transverse lines I-I and II-II in FIG. 3A .

FIG. 4B , FIG. 4C and FIG. 4D illustrate the composition of light sources through different light channels from the cross section in FIG. 4A .

FIG. 5 illustrates an illumination device applied to an LED projector proposed by an embodiment of the present invention.

FIG. 6 is a diagram illustrating a liquid crystal display projection device using an illumination device according to a preferred embodiment of the present invention.

FIG. 7A illustrates the liquid crystal on silicon (LCoS) projection device with three liquid crystal on silicon panels using the lighting device of the preferred embodiment of the present invention.

FIG. 7B illustrates the liquid crystal on silicon (LCoS) projection device with a single liquid crystal on silicon panel using the lighting device of the preferred embodiment of the present invention.

FIG. 8 is a diagram illustrating a digital light processing (DLP) projection device using an illumination device according to a preferred embodiment of the present invention.

Description of main component marking

100: Lighting device

110: LED monomer

120: LED array

130: Light Guide Block

135: side wall

200: light source

202: Lighting module

210: wedge-shaped glass column array

212: wedge-shaped glass column

220: wedge glass column

230: light valve

310, 320, 330 and 340: LED light source input

315, 325, 335 and 345: input hole

313, 323, 333 and 343: light guide part of the light source

350: multi-channel optical integrator

351: Main body of integrating tube

352, 354, 356: Components of multi-channel optical integrator

370: output hole

380: light reflective surface

410, 420, 430 and 440: light source position

500: LED lighting device

510: multi-channel optical integrator

520: LED array

530: Lens device

600: Liquid crystal display projection device

610: Lighting device

620: Dichroic Mirror

630: Liquid crystal display panel

640: Combining Prism

650: Projecting Lens

700A and 700B: Liquid crystal on silicon (LCoS) projection device

710: lighting fixtures

720: dichroic mirror group

720B: Mirror

722: Color Drum Wheel

724: Polarizing Plate

725: Silicon liquid crystal panel

730: Combined Prisms

730B: Polarizing Beamsplitter

740: Mirror

750: Transmitter

800: Digital optical processing projection device

810: lighting fixtures

820: Color Wheel

830: mirror surface

840: Polarizing Plate

850: Digital Microdermabrasion (DMD)

860: Projecting Lens

Detailed ways

The invention discloses a homogeneous lighting device and projection system, which utilizes multiple light sources through multi-channel light integrator tubes and lighting lens groups to simultaneously achieve the effects of light homogenization and light mixing. In addition, the technology of circular and spherical light source distribution is applied to the heat dissipation part of the lighting device, which can greatly increase the heat dissipation area, and use the heat conduction mechanism to the casing to further improve the heat dissipation effect, which can also increase the life of the lighting device. This kind of lighting device and projection system can be used in various miniature display panels, such as liquid crystal display (Liquid Crystal Display, hereinafter referred to as "LCD") panels, liquid crystal on silicon (Liquid Crystal on Silicon, hereinafter referred to as "LCoS") panels and digital optical Processing (Digital Light Processing, hereinafter referred to as "DLP") panels and other various imaging panels.

The above-mentioned light source part can be a light emitting diode (Light Emitting Diode, hereinafter referred to as "LED"), an organic light emitting diode (Organic Light Emitting Diode, hereinafter referred to as "OLED"), a laser diode (Laser Diode, hereinafter referred to as "LD"), Electro-luminescence Device (hereinafter referred to as "EL"), field emission display (Field Emission Display, hereinafter referred to as "FED"), and cold cathode fluorescent lamp (Cold Cathode Fluorescence Lamp, hereinafter referred to as "CCFL"), etc.

In order to describe the features of the present invention in detail, the following embodiments illustrate the use of a light-emitting diode (LED) projector, but it does not mean that the present invention is limited to the LED lighting device and projection system.

Please refer to FIG. 3A , which is an illuminating device applied to an LED projector according to an embodiment of the present invention, and FIG. 3B is a schematic diagram of components of a preferred embodiment of the illuminating device for an LED projector shown in FIG. 3A . The following description will be made in conjunction with FIG. 3A and FIG. 3B . The lighting device with multi-channels proposed by the present invention uses the total amount of light of multiple small channels to be aggregated into the total amount of light of a large luminous tube, and achieves the effects of light uniformity and light mixing at the same time.

Firstly, different sources of LED light sources are provided to the multi-channel light integrator 350, such as the LED light source inputs 310, 320, 330 and 340 in FIG. 350. Part of the input hole 335 can be seen in Fig. 3B. The sum of the areas of these input holes 315, 325, 335 and 345, in one embodiment, may be equal to or close to the cross-section between the integrating tube body 351 of the multi-channel optical integrating tube 350 through the cross-cutting lines I-I and II-II. area size. Of course, in other selected embodiments, the sum of the areas of the input holes 315, 325, 335 and 345 does not necessarily need to be equal to the area of the cross-section of the integrating tube main body 351, and it can be different as long as it is properly adjusted.

After the LED light source inputs 310, 320, 330 and 340 are respectively input through the input holes 315, 325, 335 and 345, the light channels formed by the light source light guide parts 313, 323, 333 and 343 are reflected to the multi-channel optical integrator tube 350. The inside of the integrating tube main body 351 , and output the light 360 with the effect of light uniformity and light mixing through the output hole 370 . According to the principle of optical invariance, the sum of the luminous flux areas of the light channels formed by all the light source light guides 313 , 323 , 333 and 343 is equal to the luminous flux area of the large light flux tube inside the integrating tube main body 351 . The design of the light guide parts 313 , 323 , 333 and 343 of the light source can be a curved surface or an arc surface. On the inside of the curved surface or curved surface of each light source light guide part 313, 323, 333 and 343, there is a light reflective surface 380, which can be covered with a layer of silver or other reflective material on the surface, for example, to reflect incident light.

And as shown in Figure 3B, multi-channel optical integrator 350 can be made up of three parts, and first part 352 has input hole 335 and 345, and second part 354 then has input hole 315 and 325, and this first part 352 and second Portion 354 may be composed and integrated into integrating tube body 351 . The third part 356 has a light source light guide configuration part 390 including the light reflection surface 380 of the light source light guide parts 313 , 323 , 333 and 343 . The three parts 352 , 354 and 356 constitute the multi-channel light integrator 350 . Such a structure is very suitable for mass production, and because of the simple assembly, it is also suitable for miniaturized portable pico projectors.

In addition, the multi-channel light integrator 350 can also be connected to a heat conduction and heat dissipation device, which can be the original heat dissipation structure of the LED light source, and heat dissipation fins can also be added to increase the heat dissipation area and heat dissipation efficiency. The fan can also be used to control the heat flow, which will contribute to the overall cooling effect.

For the lighting device applied to the LED projector according to the embodiment of the present invention, for the part of light homogenization and light mixing effect, as shown in FIG. 4A, it is illustrated that in FIG. A schematic diagram of the combination of light sources received by the light tube inside the integrating tube main body 351 in the cross section between them. Here, it is assumed that the light guided by the light source light guiding parts 313 , 323 , 333 and 343 are respectively located at the positions 410 , 420 , 430 and 440 , and these lights are provided by different LED light sources. The design provided by different LED light sources is exactly what the present invention proposes to disperse the LED light sources in different positions instead of gathering them in the same place. This can be used as a separate heat dissipation mechanism, so the service life of the LED can be greatly improved and The overall luminous efficiency can be improved. Moreover, based on the requirement of miniaturization, the size of the LED light-emitting module can also be effectively controlled, and it is also suitable for portable micro-projectors.

Assuming that the light source required by the projection system is three primary colors, that is, red, green and blue (RGB), the light source can be divided into RGGB, that is, the light entering the position 410 is arranged as red (R), and the position The rays entered by 420 and 430 are green (G), while the rays entered by position 440 are blue (B), as shown in FIG. 4B . Of course, the setting of the source light color can be modified according to the required application, and is not limited thereto. Assuming that the light sources required by the projection system are all monochromatic (Mono), then the light sources at positions 410-440 can all be monochromatic light, as shown in FIG. 4B . Assuming that the light sources required by the projection system are all white (White), then the light sources at positions 410-440 can all be white light, as shown in FIG. 4C . In the lighting device proposed by the present invention, the light source can use an LED module, and the LED module can include a plurality of R, G, B or other color LEDs mixed, or a single color LED array, and the like. With this design, electronic devices using the lighting device proposed by the present invention, such as projectors, can provide light sources with different characteristics according to requirements.

The lighting device proposed in this embodiment for LED projectors, please refer to FIG. 5 , is mainly an LED lighting device 500 composed of a plurality of LED arrays 520 with small channels, a multi-channel light integrating tube 510 and a lens device 530. . In this embodiment, an LED array is used to generate the required light source. Of course, those skilled in the art know that any form of light source that can generate the required light can be used instead. The connection relationship between the LED array 520 and the corresponding small channel formed by the light guide part of the light source can be closely combined or there is a small distance, which can be determined according to the needs of the application. The light 515 emitted by the multi-channel light integrator 510 has the effects of uniformity and light mixing, and is converted into the required light beam 525 by the lens device 530 .

The lighting device proposed in this embodiment for LED projectors can be used in liquid crystal display (LCD) projection devices, silicon liquid crystal (LCOS) projection devices, and digital optical processing (DLP) projection devices, etc., which require a uniform light source. electronic device. By using the lighting device proposed by the present invention, the image generation module of the projection system can achieve the purpose of displaying images according to the light source with high uniformity and high brightness. Moreover, the lighting device proposed by the present invention can be connected to the heat conduction and heat dissipation device of the projection system for heat conduction and heat dissipation. In addition, heat dissipation fins can also be added to increase the heat dissipation area and heat dissipation efficiency. The fan can also be used to control the heat flow, which will contribute to the overall cooling effect.

The following is only an illustration of a practical example of a projection system using the lighting device proposed by the present invention, but it is not limited thereto.

Please refer to FIG. 6 , which schematically illustrates a liquid crystal display projection device 600 using an illumination device according to a preferred embodiment of the present invention. The liquid crystal display projection device 600 uses the lighting device 610 proposed by the present invention, and the light source of the lighting device 610 is, for example, an LED light source. The source light will be separated from the three primary colors red, green and blue (RGB) by a plurality of dichroic mirrors (Dichroic Mirror) 620, and sent to the corresponding liquid crystal display panel 630, and then the three primary colors generated by combining prism (Combining Prism) 640 After the images are combined, a full-color (Full-Color) image is generated and transmitted to the display screen through the projecting lens (Projecting Len) 650.

Please refer to FIG. 7A , which mainly illustrates a liquid crystal on silicon (LCoS) projection device 700A using the lighting device of a preferred embodiment of the present invention. The liquid crystal on silicon projection device 700A has three liquid crystal on silicon panels 725 and uses the lighting device 710 proposed by the present invention. The light source of the lighting device 710 is, for example, an LED light source. The source light will be separated from the three primary colors red, green, and blue (R, G, B) through multiple dichroic mirror groups 720, and sent to the corresponding silicon liquid crystal panel 725, and then combined with the prism (Combining Prism) 730 After the generated images of the three primary colors are combined, a full-color (Full-Color) image is generated and transmitted to the display screen through the reflector 740 and the projecting lens (Projecting Len) 750 .

Please refer to FIG. 7B , which mainly illustrates a liquid crystal on silicon (LCoS) projection device 700A using the lighting device of a preferred embodiment of the present invention. The LCD projection device 700A has a single liquid crystal on silicon (Single LCoS) panel 725, and uses the lighting device 710 proposed by the present invention. The light source of the lighting device 710 is, for example, an LED light source. The source light is reflected by the reflector 720B to the color drum wheel (Color Drum Wheel) 722 with a plurality of different filter areas. The drum-shaped color wheel 722 uses a rotating method to allow the incident light to touch the filter areas at different positions. , in order to separate the three primary colors red, green and blue (R, G, B) in the source light. Then pass through the polarizing plate (PolarizingPlate) 724, polarizing beam splitter (Polarizing Beam Splitter, PBS) 730B and transmit to the corresponding silicon liquid crystal panel 725, and then pass through the polarizing beam splitter 730B to produce full-color (Full- Color) images are transmitted to the display screen via the projecting lens (Projecting Len) 750.

Please refer to FIG. 8 , which mainly illustrates a digital light processing (DLP) projection device 800 using an illumination device according to a preferred embodiment of the present invention. The digital optical processing projection device 800 has a digital micro-mirror device (Digital Micro-Mirror Device, hereinafter referred to as DMD) 850, and uses the lighting device 810 proposed by the present invention. The light source of the lighting device 810 is, for example, an LED light source.

The source light first passes through a color wheel (Color Wheel) 820 with a plurality of different filter areas. The color wheel 820 uses a rotating method to allow the incident light to touch the filter areas at different positions, so that the three primary colors in the source light are red. , green and blue (R, G, B) are separated. After passing through the reflective mirror surface 830 and the polarizing plate (Polarizing Plate) 840, it is transmitted to the digital microcrystalline lens (DMD) 850, and after digital optical processing, it is transmitted to the projecting lens (Projecting Len) 860 and transmitted to the display screen.

The lighting device and projection system disclosed in the present invention use multiple light sources to achieve the effects of light uniformity and light mixing through multi-channel light integrator tubes and lighting lens groups. In addition, the technology of light source distribution is applied to the heat dissipation part of the lighting device, which can greatly increase the heat dissipation area, and use the heat conduction mechanism to the casing to further improve the heat dissipation effect, which can also increase the life of the lighting device.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some changes and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the claims.

Claims (19)

1, a kind of lighting device is characterized in that comprising:

A plurality of light source modules; And

Multi-channel type light integration pipe, have a plurality of optical channels, each this optical channel has its light source light guide section, and each this corresponding above-mentioned these light of optical channel one of come in the source module, wherein this light source module is sent to this corresponding optical channel with the light of its output, and the light source light guide section of each this optical channel has reflecting surface, in order to originating via the light that above-mentioned these optical channels are imported, converge and put in order this multi-channel type light integration pipe, and the output of this lighting device is provided according to this.

2, lighting device according to claim 1 is characterized in that also comprising lens combination, carries out anaclasis or scattering processing in order to the light that this multi-channel type light integration pipe is exported.

3, lighting device according to claim 1 is characterized in that the luminous flux area summation of above-mentioned these optical channels equals the interior luminous flux area of this multi-channel type light integration pipe.

4, lighting device according to claim 1, the surface that it is characterized in that this light source light guide section is a curved design.

5, lighting device according to claim 1 is characterized in that the surface of this light source light guide section is designed for cambered surface.

6, lighting device according to claim 1 is characterized in that above-mentioned these light source modules provide different combination of light sources, and adjusts the light composition of this lighting device output.

7, lighting device according to claim 1 is characterized in that above-mentioned these light source modules are LED light-source module.

8, lighting device according to claim 7 is characterized in that above-mentioned these LED light-source modules comprise the array that a plurality of redness, green and blue LED are formed.

9, lighting device according to claim 7 is characterized in that above-mentioned these LED light-source modules comprise the array that a plurality of solid color light emitting diodes are formed.

10, lighting device according to claim 7 is characterized in that above-mentioned these LED light-source modules comprise the array that a plurality of white light-emitting diode is formed.

11, lighting device according to claim 1 is characterized in that above-mentioned these light source modules are organic LED light source module, laser diode light source module, electroluminescent cell light source module, field-emitter display light source module or cold-cathode fluorescence lamp light source module.

12, lighting device according to claim 1 is characterized in that this multi-channel type light integration pipe comprises radiating fin, can be in order to heat radiation.

13, a kind of optical projection system is characterized in that comprising:

Lighting device comprises:

A plurality of light source modules; And

Multi-channel type light integration pipe, have a plurality of optical channels, each this optical channel has its light source light guide section, and each this corresponding above-mentioned these light of optical channel one of come in the source module, wherein this light source module is sent to this corresponding optical channel with the light of its output, and the light source light guide section of each this optical channel has reflecting surface, in order to originating via the light that above-mentioned these optical channels are imported, converge and put in order this multi-channel type light integration pipe, and the output of this lighting device is provided according to this; And

The image generation module, according to the picture signal source, the light that uses this lighting device to produce produces corresponding image.

14, optical projection system according to claim 13 is characterized in that above-mentioned these light source modules are LED light-source module.

15, optical projection system according to claim 13 is characterized in that also comprising heat abstractor, and wherein this lighting device can dispel the heat by this heat abstractor.

16, optical projection system according to claim 13 is characterized in that this optical projection system is a liquid crystal display projection apparatus.

17, optical projection system according to claim 13 is characterized in that this optical projection system is the silicon liquid crystal board projection arrangement with single silicon liquid crystal board.

18, optical projection system according to claim 13 is characterized in that this optical projection system is the silicon liquid crystal board projection arrangement with three silicon liquid crystal boards.

19, optical projection system according to claim 13 is characterized in that this optical projection system is a digital optical process projection device.

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