CN114217498B - LCD projector illumination system and LCD projector - Google Patents
LCD projector illumination system and LCD projector Download PDFInfo
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- CN114217498B CN114217498B CN202210074313.6A CN202210074313A CN114217498B CN 114217498 B CN114217498 B CN 114217498B CN 202210074313 A CN202210074313 A CN 202210074313A CN 114217498 B CN114217498 B CN 114217498B
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- 238000005286 illumination Methods 0.000 title claims abstract description 68
- 230000003287 optical effect Effects 0.000 claims description 15
- 239000011521 glass Substances 0.000 claims description 14
- 238000003384 imaging method Methods 0.000 claims description 14
- 238000009413 insulation Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 230000017525 heat dissipation Effects 0.000 description 7
- 239000000758 substrate Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000001795 light effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 208000033999 Device damage Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
- G03B21/006—Projectors using an electronic spatial light modulator but not peculiar thereto using LCD's
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2013—Plural light sources
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Projection Apparatus (AREA)
- Liquid Crystal (AREA)
Abstract
The invention provides an LCD projector illumination system and an LCD projector, wherein the LCD projector illumination system comprises: the LED lamp comprises a light source module, a light condensing element, a collimating lens and an LCD screen, wherein the light condensing element, the collimating lens and the LCD screen are sequentially arranged along the light emitting direction of the light source module; the light source module comprises a plurality of light emitting pieces distributed in an array, the light collecting elements comprise a plurality of light collecting lenses distributed in an array, the light incident surface of the LCD screen is divided into a plurality of illumination areas in an average mode, the light emitting pieces, the light collecting lenses and the illumination areas are arranged in a one-to-one correspondence mode, and the centers of the corresponding light emitting pieces, the centers of the corresponding light collecting lenses and the centers of the corresponding illumination areas are located on the same straight line. According to the LCD projector illumination system provided by the embodiment of the invention, the plurality of illumination areas are divided on the LCD screen in an average manner, and the plurality of light emitting elements and the condensing lenses distributed in an array manner are arranged to correspondingly illuminate the illumination areas, so that a scattered illumination mode is realized, better light brightness and illumination uniformity are obtained, the lighting effect of a picture is improved, and the light spot uniformity of the LCD screen is improved.
Description
Technical Field
The present invention relates to the field of projection technologies, and in particular, to an LCD projector illumination system and an LCD projector.
Background
In the illumination light path of the current single-chip LCD projector, a single light funnel is generally adopted as a light condensing element to collect light rays emitted by a light source, and a large-angle light ray of the light source is reflected by an inclined reflecting wall in the light funnel so as to reflect the large-angle light ray to the edge of a light outlet of the light funnel to be emitted.
Disclosure of Invention
The invention aims to provide an LCD projector illumination system and an LCD projector, which solve the defects and shortcomings in the prior art.
An LCD projector illumination system of the present invention includes: the LED lamp comprises a light source module, a light condensing element, a collimating lens and an LCD screen, wherein the light condensing element, the collimating lens and the LCD screen are sequentially arranged along the light emitting direction of the light source module;
the light source module comprises a plurality of light emitting parts distributed in an array, the light collecting elements comprise a plurality of light collecting lenses distributed in an array, the light incident surface of the LCD screen is divided into a plurality of illumination areas in an average mode, the light emitting parts, the light collecting lenses and the illumination areas are arranged in a one-to-one correspondence mode, the centers of the corresponding light emitting parts, the corresponding light collecting lenses and the corresponding illumination areas are located on the same straight line, the light collecting lenses are used for converging light rays emitted by the corresponding light emitting parts into uniform light spots, and the uniform light spots are projected to the corresponding illumination areas after being collimated by the collimating lenses.
Compared with the prior art, the LCD projector illumination system provided by the embodiment of the invention has the advantages that the illumination areas are divided on the LCD screen evenly, the illumination areas are correspondingly illuminated by arranging the plurality of light emitting parts distributed in an array and the condensing lenses, so that a scattered illumination mode is realized, better light brightness and illumination uniformity are obtained, the image lighting effect is improved, the light spot uniformity of the LCD screen is improved, the light spot uniformity can reach more than 85%, meanwhile, the light source is distributed in a scattered manner, the heat dissipation of the light source is facilitated, and the service life of the light source is prolonged.
In a preferred or alternative embodiment, the light incident surface of the condensing lens is a plane, and the light emergent surface is a free-form surface.
In a preferred or alternative embodiment, the LCD projector illumination system further comprises an insulating glass interposed between the collimating lens and the LCD screen.
In a preferred or alternative embodiment, the LCD projector illumination system satisfies the following relationship:
0mm≤d1≤1.0mm；
10.0mm≤d2≤20.0mm；
10.0mm≤d3≤50.0mm；
0mm≤d4≤5.0mm；
5.0mm≤d5≤10.0mm；
wherein d1 is the distance between the light emitting surface of the light emitting element and the light incident surface of the corresponding condensing lens along the optical axis direction, d2 is the distance between the light incident surface of the condensing lens and the light emitting surface of the condensing lens along the optical axis direction, d3 is the distance between the light emitting surface of the condensing lens and the light incident surface of the collimating lens along the optical axis direction, d4 is the distance between the light emitting surface of the collimating lens and the light incident surface of the heat-insulating glass along the optical axis direction, and d5 is the distance between the light emitting surface of the heat-insulating glass and the light incident surface of the LCD screen along the optical axis direction.
In a preferred or alternative embodiment, the LCD projector illumination system satisfies the following relationship:
nd is more than or equal to 1.5 and less than or equal to 1.9; wherein Nd is the refractive index of the condensing lens.
In a preferred or alternative embodiment, the collimating lens is a fresnel lens.
In a preferred or alternative embodiment, the surface of the insulating glass is provided with a brightness enhancing film.
In a preferred or alternative embodiment, the light collecting element further includes a transparent mounting plate, and the light incident surfaces of the plurality of light collecting lenses are all mounted on the transparent mounting plate in a fitting manner.
An LCD projector according to the present invention comprises a focusing lens, an imaging lens, and an LCD projector illumination system according to any one of claims 1 to 8, wherein the focusing lens and the imaging lens are sequentially disposed in a light-emitting direction of the LCD screen.
Compared with the prior art, the LCD projector can obtain better light brightness and illumination uniformity, has higher picture light effect, has better light spot uniformity of an LCD screen, and can reach more than 85 percent, so that the quality of a projected image is better, and meanwhile, the light sources are distributed in a dispersed manner, thereby being beneficial to heat dissipation of the light sources and prolonging the service life of the light sources.
In a preferred or alternative embodiment, the LCD projector further comprises a reflective mirror plate between the focusing lens and the imaging lens.
For a better understanding and implementation, the present invention is described in detail below with reference to the drawings.
Drawings
FIG. 1 is a schematic diagram of an LCD projector illumination system according to the present invention;
FIG. 2 is a schematic view of the light incident surface of the LCD screen of the present invention;
FIG. 3 is a schematic view of a condensing element according to the present invention;
FIG. 4 is a schematic diagram of an LCD projector according to the present invention;
reference numerals:
10. a light source module; 11. a light emitting member; 12. a substrate; 20. a light-condensing element; 21. a condensing lens; 22. a transparent mounting plate; 30. an LCD screen; 31. an illumination area; 40. a collimating lens; 50. a heat insulating glass; 60. a focusing lens; 70. an imaging lens; 80. a reflection lens; 91. a first heat sink; 92. a heat conduction pipe; 93. a second heat sink; 94. a heat radiation fan.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
It should be understood that in the description of the present application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application. The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, i.e., features defining "first," "second," may explicitly or implicitly include one or more such features. Furthermore, unless otherwise indicated, the meaning of "a plurality" is two or more.
It should be noted that, in the description of the present application, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "hollow" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
Example 1
Referring to fig. 1 to 3, fig. 1 is a schematic structural diagram of an LCD projector illumination system according to the present invention; FIG. 2 is a schematic view of the light incident surface of the LCD screen of the present invention; fig. 3 is a schematic structural view of the condensing element of the present invention.
The present embodiment provides an LCD projector illumination system, which may be applied to an LCD projector, including: a light source module 10, and a condensing element 20, a collimating lens 40 and an LCD panel 30 sequentially disposed along a light emitting direction of the light source module 10. The light emitted by the light source module 10 is incident into the light condensing element 20, is converged by the light condensing element 20, and then is emitted to the collimating lens 40, and is collimated by the collimating lens 40, and then is projected onto the LCD screen 30 to form a projection image.
Specifically, in this embodiment, the light source module 10 includes a plurality of light emitting elements 11 distributed in an array, the light collecting element 20 includes a plurality of light collecting lenses 21 distributed in an array, the light incident surface of the LCD screen 30 is divided into a plurality of illumination areas 31 on average, the light emitting elements 11, the light collecting lenses 21 and the illumination areas 31 are arranged in a one-to-one correspondence manner, specifically, in this embodiment, the light emitting elements 11, the light collecting lenses 21 and the illumination areas 31 are all arranged in four correspondence, each illumination area 31 is illuminated by one light emitting element 11 and one light collecting lens 21, and the light emitting elements 11 and the light collecting lenses 21 are all arranged in a rectangular array. In other embodiments, the number of the light emitting elements 11, the condensing lenses 21 and the illumination areas 31 may be greater than two, and the specific principle is similar to that of the present embodiment, and will not be described in detail herein.
In this embodiment, the centers of the corresponding light emitting element 11, the condensing lens 21 and the illumination area 31 are on the same straight line, the condensing lens 21 is configured to condense the light emitted by the corresponding light emitting element 11 into a uniform light spot, and the uniform light spot is collimated by the collimating lens 40 and then projected into the corresponding illumination area 31, so as to illuminate the illumination area 31, and the uniform light spot forms a projection image after passing through the LCD screen 30. Specifically, the uniform light spot is a rectangular uniform light spot, and the shape of the illumination area 31 corresponds to the shape of the light spot, that is, the shape of the illumination area 31 is also rectangular.
According to the LCD projector illumination system provided by the embodiment of the invention, the plurality of illumination areas 31 are divided on the LCD screen 30 on average, and the plurality of light emitting elements 11 distributed in an array and the condenser lenses 21 are arranged to correspondingly illuminate the illumination areas 31, so that a scattered illumination mode is realized, better light brightness and illumination uniformity are obtained, the picture lighting effect is improved, the light spot uniformity of the LCD screen 30 is improved, the light spot uniformity can reach more than 85%, meanwhile, the light source is distributed in a scattered manner, the heat dissipation of the light source is facilitated, and the service life of the light source is prolonged.
The light emitting component 11 preferably adopts an LED light source, which has strong light emitting brightness and can emit emitted light forward, the light source module 10 further comprises a substrate 12, the light emitting components 11 are all arranged on the substrate 12, and the substrate 12 can supply power to the light emitting components 11 through an external circuit, so as to play roles of bearing and conducting electricity.
Preferably, the light collecting element further includes a transparent mounting plate 22, the light incident surfaces of the light collecting lenses 21 are mounted on the transparent mounting plate 22 in a fitting manner, so that the light collecting element can be conveniently mounted and arranged, the transparent mounting plate 22 can be integrally formed with the light collecting lenses 21, the later mounting error is reduced, the damage rate is reduced, the mounting efficiency is improved, and the light collecting element is convenient to manufacture.
In this embodiment, the collimating lens 40 is disposed at the light emitting surfaces of all the condensing lenses 21, and the divergent uniform light spots emitted from the condensing lenses 21 are collimated by the collimating lens 40 and then are emitted into the LCD screen 30, so as to collimate the light, thereby eliminating aberration, achieving better light homogenizing effect, and making the projected brightness more uniform and clear. In this embodiment, the number of the collimating lenses 40 corresponds to the number of the condensing lenses 21, the collimating lenses 40 are plural, and each collimating lens 40 is disposed at the light emitting surface of each condensing lens 21. The collimating lens 40 is a fresnel lens and is made of plastic material.
The light incident surface of the condensing lens 21 is a plane, the light emergent surface is a free-form surface, and the uniformity of emergent uniform light spots can be improved by reasonably designing the parameters of the free-form surface.
Preferably, the LCD projector illumination system of this embodiment further includes a heat insulating glass 50 disposed between the collimating lens 40 and the LCD screen 30, and the heat insulating glass 50 is disposed to reduce the light emission heat and the risk of device damage, and preferably, a brightness enhancement film is disposed on the surface of the heat insulating glass 50 to enhance the brightness of the transmitted light.
Preferably, the LCD projector illumination system of the present embodiment satisfies the following relationship:
0mm≤d1≤1.0mm；
10.0mm≤d2≤20.0mm；
10.0mm≤d3≤50.0mm；
0mm≤d4≤5.0mm；
5.0mm≤d5≤10.0mm；
where d1 is a distance between the light emitting surface of the light emitting element 11 and the light incident surface of the corresponding condensing lens 21 along the optical axis direction, d2 is a distance between the light incident surface of the condensing lens 21 and the light emitting surface of the condensing lens 21 along the optical axis direction, d3 is a distance between the light emitting surface of the condensing lens 21 and the light incident surface of the collimating lens 40 along the optical axis direction, d4 is a distance between the light emitting surface of the collimating lens 40 and the light incident surface of the insulating glass 50 along the optical axis direction, and d5 is a distance between the light emitting surface of the insulating glass 50 and the light incident surface of the LCD screen 30 along the optical axis direction. The spacing of the components and the thickness of the condensing lens 21 are arranged in this way, which helps to improve the uniformity of the light output of the system, improve the quality of light, and shorten the overall length of the system. Alternatively, in this embodiment d1=0.5 mm, d2=11.5 mm, d3=22.1 mm, d4=3.4 mm, d5=6.7 mm.
Preferably, the LCD projector illumination system of the present embodiment further satisfies the following relationship:
nd is more than or equal to 1.5 and less than or equal to 1.9; where Nd is the refractive index of the condensing lens 21, and the reasonable setting of the refractive index of the lens further improves the spot uniformity of the LCD screen 30, and optionally, nd=1.67 in this embodiment.
Example 2
Referring to fig. 4, fig. 4 is a schematic structural diagram of an LCD projector according to the present invention.
The present embodiment provides an LCD projector, which includes a focusing lens 60, an imaging lens 70, and the LCD projector illumination system described in embodiment 1, wherein the focusing lens 60 and the imaging lens 70 are sequentially disposed in the light emitting direction of the LCD screen 30. The projection image formed by the LCD screen 30 is converged by the focusing lens 60 in order to reduce the aperture of the lens, and finally amplified by the imaging lens 70 and projected outwards. The LCD projector according to the embodiment can obtain better light brightness and illuminance uniformity, has higher picture light effect, has better light spot uniformity of the LCD screen 30, and has light spot uniformity of more than 85% so that the quality of the projected image is better.
Preferably, the LCD projector of the present embodiment further includes a reflection mirror 80 disposed between the focusing lens 60 and the imaging lens 70. The reflecting mirror 80 can change the propagation direction of the projected image, reduce the total transverse length of the light path, and facilitate the adjustment of specific angles. Specifically, the projected image is reflected by the reflecting plate 80 by 45 ° and then enters the imaging lens 70. The focusing lens 60 is a fresnel lens and is made of plastic material. The imaging lens 70 may be composed of several lenses.
In order to solve the problem of heat generation of the LCD projector and improve the heat dissipation effect, preferably, the LCD projector of the present embodiment further includes a first heat sink 91, a heat conduction pipe 92, a second heat sink 93 and a heat dissipation fan 94, wherein the first heat sink 91 is disposed on the back surface of the light source module 10 (i.e. the back surface of the substrate 12), the second heat sink 93 is disposed on the side surface of the LCD projector illumination system, the heat conduction pipe 92 is connected between the first heat sink 91 and the second heat sink 93, and the heat dissipation fan 94 is disposed on the side surface of the second heat sink 93. This LCD projector is through setting up first radiator 91, heat pipe 92, second radiator 93 and radiator fan 94, will first radiator 91 set up in on the back of light source module 10, to the back that calorific capacity is most concentrated on the light source module 10 absorbs heat, then will absorb heat pass through heat pipe 92 transmits to second radiator 93 on the side, so that radiator fan 94 is from the side face second radiator 93 dispels the heat, so can make ventilation effect good, the radiating effect is good.
The first heat sink 91 is preferably but not limited to an aluminum block or sheet; the heat conducting pipes 92 are preferably but not limited to copper heat conducting pipes 92, and the number of the heat conducting pipes is two; the second heat sink 93 is preferably, but not limited to, a heat sink fin. Specifically, the LCD projector further includes a mounting case (not shown) for accommodating components of the LCD projector, that is, the first heat sink 91, the heat pipe 92, the second heat sink 93, the heat dissipation fan 94, the focusing lens 60, the imaging lens 70, the LCD projector illumination system, and the reflection lens 80. An air outlet corresponding to the cooling fan 94, an air inlet communicated with the air outlet and a lens opening are formed in the assembly shell; preferably, the air inlet is provided with a dust-separating net.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (7)
1. An LCD projector illumination system, comprising:
the LED lamp comprises a light source module, a light condensing element, a collimating lens and an LCD screen, wherein the light condensing element, the collimating lens and the LCD screen are sequentially arranged along the light emitting direction of the light source module;
the light source module comprises a plurality of light emitting pieces distributed in an array, the light collecting elements comprise a plurality of light collecting lenses distributed in an array, the light incident surface of the LCD screen is divided into a plurality of illumination areas in an average mode, the light emitting pieces, the light collecting lenses and the illumination areas are arranged in a one-to-one correspondence mode, the centers of the corresponding light emitting pieces, the light collecting lenses and the illumination areas are positioned on the same straight line, the light collecting lenses are used for converging light rays emitted by the corresponding light emitting pieces into uniform light spots, and the uniform light spots are projected into the corresponding illumination areas after being collimated by the collimating lenses;
the light incident surface of the condensing lens is a plane, and the light emergent surface is a free curved surface;
the LCD projector illumination system also comprises heat insulation glass which is arranged between the collimating lens and the LCD screen in a spacing way;
the LCD projector illumination system satisfies the following relationship:
0mm≤d1≤1.0mm；
10.0mm≤d2≤20.0mm；
10.0mm≤d3≤50.0mm；
0mm≤d4≤5.0mm；
5.0mm≤d5≤10.0mm；
wherein d1 is the distance between the light emitting surface of the light emitting element and the light incident surface of the corresponding condensing lens along the optical axis direction, d2 is the distance between the light incident surface of the condensing lens and the light emitting surface of the condensing lens along the optical axis direction, d3 is the distance between the light emitting surface of the condensing lens and the light incident surface of the collimating lens along the optical axis direction, d4 is the distance between the light emitting surface of the collimating lens and the light incident surface of the heat-insulating glass along the optical axis direction, and d5 is the distance between the light emitting surface of the heat-insulating glass and the light incident surface of the LCD screen along the optical axis direction.
2. The LCD projector illumination system according to claim 1, wherein the LCD projector illumination system satisfies the following relationship:
nd is more than or equal to 1.5 and less than or equal to 1.9; wherein Nd is the refractive index of the condensing lens.
3. The LCD projector illumination system of claim 1, wherein:
the collimating lens is a Fresnel lens.
4. The LCD projector illumination system of claim 1, wherein:
the surface of the heat-insulating glass is provided with a brightness enhancement film.
5. An LCD projector illumination system as recited in any one of claims 1-4, wherein:
the light condensing element further comprises a transparent mounting plate, and the light incident surfaces of the light condensing lenses are mounted on the transparent mounting plate in a fitting mode.
6. An LCD projector, comprising:
a focusing lens, an imaging lens and an LCD projector illumination system according to any one of claims 1 to 5, the focusing lens and the imaging lens being sequentially arranged in the light-emitting direction of the LCD screen.
7. The LCD projector of claim 6, wherein:
and a reflecting mirror plate positioned between the focusing lens and the imaging lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210074313.6A CN114217498B (en) | 2022-01-21 | 2022-01-21 | LCD projector illumination system and LCD projector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210074313.6A CN114217498B (en) | 2022-01-21 | 2022-01-21 | LCD projector illumination system and LCD projector |
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| Publication Number | Publication Date |
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| CN114217498A CN114217498A (en) | 2022-03-22 |
| CN114217498B true CN114217498B (en) | 2024-01-02 |
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| CN101785320A (en) * | 2007-08-23 | 2010-07-21 | 皇家飞利浦电子股份有限公司 | Light source for a projector |
| CN107479312A (en) * | 2017-09-22 | 2017-12-15 | 四川省雷克赛恩电子科技有限公司 | A kind of single liquid crystal projecting illumination system of multiple light courcess |
| CN209805986U (en) * | 2019-07-22 | 2019-12-17 | 东莞广辰光电科技有限公司 | Projection structure with uniform brightness |
| CN212694237U (en) * | 2020-07-23 | 2021-03-12 | 广州瑞格尔电子有限公司 | Light angle control module and single-chip LCD projector |
| CN112068391A (en) * | 2020-09-27 | 2020-12-11 | 深圳市格一创新电器有限公司 | Single-chip LCD projection method, projector and optical system thereof |
| CN213934518U (en) * | 2020-12-01 | 2021-08-10 | 成都德利普光电科技有限公司 | LCD projector lighting system |
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