CN1425937A - Projection display device with diffraction grating element - Google Patents
Projection display device with diffraction grating element Download PDFInfo
- Publication number
- CN1425937A CN1425937A CN 01143854 CN01143854A CN1425937A CN 1425937 A CN1425937 A CN 1425937A CN 01143854 CN01143854 CN 01143854 CN 01143854 A CN01143854 A CN 01143854A CN 1425937 A CN1425937 A CN 1425937A
- Authority
- CN
- China
- Prior art keywords
- diffraction grating
- light
- projection display
- grating assembly
- display equipment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Optical Elements Other Than Lenses (AREA)
Abstract
The multiple-lens projection display device includes one light source, two dichromatic light splittihng lenses to separate three primary colors of light, three diffraction grating assemblies in the three primary color light paths, three reflecting light valves and three lenses. The diffraction grating assembly consists of one glass substrate and several aluminum ribs to reflec S polarized light and penetrate P polarized light. The reflecting light valve is perpendicular to the lens and located in the side with aluminum ribs of the diffraction grating assembly. So, the functions of reducing weight, raising image color quality and lowering cost may be reached while not degrading quality of the display image.
Description
[technical field]
The present invention relates to a kind of projection display equipment, particularly relate to and a kind ofly cooperate three diffraction grating elements to come reflection ray or allow the projection display equipment of light penetration with three camera lenses.
[background technology]
How many general liquid crystal optics projection display equipments can be divided into according to optical element: single-lens formula, double lens type, and three kinds of three-lens formulas, no matter the kind of display device why, all need utilize light valve to control in the projection of light.In order effectively to handle the light that send in the lamp source, U.S.'s patent of invention the 5th, 327, the projection display equipment that provides for No. 270 has two kinds of single-lens and three-lens forms, the structure of wherein single-lens projection display equipment 1 as shown in Figure 1, comprise a lamp source 11 that light is provided, but the polarization splitting prism 12 of a reflection ray, 1/4 ripple plate 13 of one tool phase correction function, the camera lens 15 of one reflective light valves 14 and a projection image, wherein polarization splitting prism 12 is positioned at the below in lamp source 11, has a film 121 that tilts from left to right on it, this film 121 is folded between two glass blocks 122, constitute a cube that makes the reflection of different polarization light tool or penetrate function whereby, that is to say, this polarization splitting prism 12 can allow the P polarization light pass through, but the S polarization light is reflected, and this 1/4 ripple plate 13 and reflective light valves 14 all are positioned at the right side of polarization splitting prism 12, and 15 on camera lens is positioned at polarization splitting prism 12 left sides.As for the three-lens projection display equipment of aforementioned U.S. patent of invention, the single-lens pattern of its each unit and above-mentioned announcement is identical haply, no longer explanation.When lamp source 11 projected the S polarization light, light can be to 13 reflections of 1/4 ripple plate, for the first time by projecting on the reflective light valves 14 behind the 1/4 ripple plate 13 when arriving the film 121 of polarization splitting prism 12 again.When reflective light valves 14 presents opening, the light of S polarization can reflect and convert to the P polarization state, then oppositely for the second time by behind the 1/4 ripple plate 13, cause as function by one time 1/2 ripple plate, reach the purpose of adjusting light phase place (phase), and after polarization splitting prism 12 arrives camera lens 15 projection video pictures at last.On the contrary, when reflective light valves 14 is closed, the S polarization light is through film 121 reflex times of polarization splitting prism 12, arrive reflective light valves 14 through 1/4 ripple plate 13 equally, reflection via this reflective light valves 14, light can reflect back according to original path, and just light can't pass film 121 and arrive camera lens 15.
The main spirit of aforesaid U.S. Patent be make the quick optical axis of 1/4 ripple plate 13 or at a slow speed optical axis divide the primary optic axis of prism 12 vertical with polarized light with the plane of second optical axis, can allow the wider light of incident angle distribution range all be corrected into the effective sunlight of investing camera lens 15 like this, contrast and lightness during with 15 video pictures of raising camera lens.
The effect of contrast and lightness when though above-mentioned United States Patent (USP) has the raising video picture, but in order to reach this effect, the reflective light valves 14 of this patent and camera lens 15 are the left and right sides that are located at polarization splitting prism 12 respectively, and light is when casting out two glass blocks 122 through polarization splitting prism 12 by lamp source 11, because glass blocks 122 has thermal stress on making residual, when ray cast path during through residual regional of thermal stress, the refraction angle meeting different (stress birefringence) that light produces, and the pass through distance of glass blocks 122 of light is big more, its refraction angle that departs from can be big more, and this will make image color uniformity coefficient variation that camera lens 15 presents.Though this United States Patent (USP) is provided with 1/4 ripple plate 13 of tool phase correction function at polarization splitting prism 12 and 14 of reflective light valves, this design can only improve the lightness and the contrast of video picture, and can't solve the phenomenon of irregular colour.The optical system that aforementioned patent provided simultaneously not only needs to set up 1/4 ripple plate 13 and proofreaies and correct the ray cast angle, the volume of the polarization splitting prism 12 of its cube pattern is big, weight is big, also make to produce the price height in the actual production process, and be not inconsistent shortcoming such as compact principle.
[summary of the invention]
The objective of the invention is is providing a kind of phase correction that need not, and when having acceptable contrast ratio and lightness, reach the video picture color evenly, the projection display equipment with diffraction grating assembly of weight saving, effect such as cheap.
Projection display equipment of the present invention is characterized in that: this projection display equipment comprises: a lamp source, two double-colored spectroscopes, three diffraction grating assemblies, three reflective light valves and three-lens.Wherein this lamp source can provide polarization light, and two double-colored spectroscopes all are located on the projected path of polarization light, be used for separating the three primary colors in the light, make three primary colors form three road projected path discretely, and these diffraction grating assemblies are positioned at respectively on trichromatic three paths obliquely, each diffraction grating assembly all has a glass board material, and the aluminium rib of a tool reflection function, wherein has first side towards light on this glass substrate, and second side that deviates from first side and be provided with for this aluminium rib, and these reflective light valves all optionally change the polarization state of light, each reflective light valves all has a reflecting surface towards second side of diffraction grating assembly, and these camera lenses all are used for receiving light and video picture, above-mentioned camera lens respectively with the diffraction grating assembly on the second side correspondence.
[description of drawings]
The present invention is described in detail below in conjunction with drawings and Examples:
Fig. 1 is a three-dimensional exploded view, and each assembly corresponding states on the single-lens projection display equipment of the 5th, 327, No. 270 patents of invention of the U.S. is described.
Fig. 2 is the stereoscopic correspondence figure of a preferred embodiment of projection display equipment of the present invention, and this projection display equipment is the three-lens form.
Fig. 3 is a side view, and single lens in this preferred embodiment, diffraction grating element and reflective light valves corresponding states are described, simultaneously the display light thread path.
[embodiment]
Consult Fig. 2,3, the projection display equipment 2 of present embodiment is a kind of form of three-lens, this display device 2 can be used to handle polarization light, it comprises: the double-colored spectroscope in a lamp source 20 that produces polarization light, two 21,22, a catoptron 23, three 24,25,26, three reflective light valves 27,28,29 of diffraction grating element, and three camera lenses 30,31,32.Wherein this lamp source 20 can provide polarization light, and allow polarization light cast out along an opticpath, and these double-colored spectroscopes 21,22 three road primary colour beams in lamp source 20 can being emitted beam separate, the function of catoptron 23 is: two double-colored spectroscopes 21 are passed in reflection simultaneously, 22 primary colors, make the projected path of this primary colors parallel with the projected path of other twice primary colors, and the light beam of three road different colours is distinguished corresponding three the diffraction grating assemblies 24 of investing again, 25,26, by each reflective light valves 27,28,29 control, come the light beam of separate processes three road different colours, and make the light beam of the different primary colors in three roads project corresponding respectively camera lens 30 at last, 31, on 32.
These diffraction grating assemblies 24,25,26 all are a kind of polarizer (Polariers), with regard to principle, it has reflection S polarization light and the effect that allows the P polarization light penetrate, below explains with diffraction grating assembly 24 and corresponding reflective light valves 27, camera lens 30 earlier.Diffraction grating assembly 24 of the present invention is to be made by Moxtek company, and it has the tabular glass board material of a thin slice 241 and several aluminium ribs 242 that be arranged in parallel.Wherein this glass board material 241 comprises one first side 243 parallel to each other and one second side 244, and above-mentioned first side 243 is towards double-colored spectroscope 21, and these aluminium ribs 242 are to be molded on second side 244 of glass board material 241.That is to say that this diffraction grating assembly 24 can allow the P polarization light pass through, but make the S polarization light when second side 244 of directive tool aluminium rib 242, reflect.In design, the tilt angle theta of these diffraction grating assembly 24 installations is good with 30～50 degree.
This reflective light valves 27 is the polarization states that optionally change its glazed thread of projection, itself and this lamp source 20 lays respectively at the both sides of diffraction grating assembly 24, above-mentioned reflective light valves 27 has a reflecting surface 271, and this reflecting surface 271 is towards second side 244 of diffraction grating assembly 24.
This camera lens 30 is to be used for receiving light and projection video picture, and it is installed on the projected path of light, and and second side, 244 correspondences of diffraction grating assembly 24.
When polarization light is cast out by lamp source 20, light can be invested first side 243 of diffraction grating assembly 24, penetrate glass board material 241 then and arrive reflective light valves 27, present at reflective light valves 27 under the state of unlatching, the light that projects reflective light valves 27 can change over the S polarization, arrive second side 244 of diffraction grating assembly 24 then through reflecting surface 271 reflections, be subjected to the reflection of aluminium rib 242 on second side 244, the S polarization light is again through the vertical camera lens 30 of investing of reflection.
Present under the closed condition and work as reflective light valves 27, the P polarization light is when arriving reflective light valves 27 by diffraction grating assembly 24, and its polarization state does not change has only reflex action, and the P polarization light of reflection can pass through diffraction grating assembly 24 once more, that is to say, oppositely send along opticpath.
By the explanation of above opticpath as can be known, the projection display equipment 2 of present embodiment is on the effect of video picture, because reflective light valves 27 and camera lens 30 all are positioned at second side, 244 1 sides of diffraction grating assembly 24, and second side 244 is provided with the aluminium rib 242 of reflection ray, therefore, on the ray cast path, the P polarization light is after penetrating glass board material 241, the behavior that only needs the process reflection and do not penetrate, that is to say, light can not be subjected to glass board material 241 effects and produce refraction effect, therefore can not influence lens imaging quality.Consult Fig. 2, the projection display equipment 2 of present embodiment is a kind of three-lens form, control by each reflective light valves 27,28,29, come the light beam of separate processes three road different colours, it is projected on the corresponding respectively camera lens 30,31,32 at last, the structure and the function of present embodiment three color light paths assemblies are all identical, below the function of repeat specification different colours light path element no longer.
By above explanation as can be known, the aforementioned projection display equipment of the present invention and the U.S. the 5th, 327, No. 270 patent is compared, except using the diffraction grating assembly to need not to carry out phase correction and omit the 1/4 ripple plate at the wide-angle incident ray, also the three-dimensional polarization splitting prism in four directions was little many more in the past for the volume of this lamellar diffraction grating assembly, therefore, this design of the present invention can effectively alleviate whole weight, and its price is also more cheap.Simultaneously since the present invention in design, this camera lens and reflective light valves all are positioned at homonymy with the aluminium rib of diffraction grating assembly, therefore, needn't penetrate the glass board material of diffraction grating assembly in the travel path of imaging light, so can improve aforementioned patent when handling light, must invest the camera lens generation because of birefringent phenomenon through block polarization splitting prism by reflective light valves, so as to improving the even disappearance of person's irregular colour in the past, that is to say, the improvement of previous constructions of the present invention not only is innovation in like product, it more can have acceptable contrast ratio, in the time of lightness, it is even to reach color, weight saving, effect such as cheap.
Claims (4)
1. projection display equipment with diffraction grating assembly, it is characterized in that: this projection display equipment comprises:
One lamp source can provide polarization light;
Two double-colored spectroscopes are located on the projected path of polarization light, are used for separating the three primary colors in the light, make three primary colors form three road projected path discretely;
Three diffraction grating assemblies, be mounted obliquely within respectively on trichromatic three paths, each diffraction grating assembly all is to have on the aluminium rib of reflection function at a glass board material and, wherein has second side that first side and towards light deviates from this first side and is provided with for the aluminium rib on this glass board material;
Three reflective light valves optionally change the polarization state of light, and each reflective light valves all has a reflecting surface towards second side of diffraction grating assembly; And
Three-lens is used for receiving light and video picture, its respectively with the second side correspondence of diffraction grating assembly.
2. the projection display equipment with diffraction grating assembly according to claim 1 is characterized in that: the angle of inclination of this diffraction grating assembly is at 30～50 degree.
3. the projection display equipment with diffraction grating assembly according to claim 1 is characterized in that: corresponding same group of reflective light valves and camera lens are vertical setting.
4. the projection display equipment with diffraction grating assembly according to claim 1, it is characterized in that: this projection display equipment also comprises: a catoptron that be arranged in parallel with two double-colored spectroscopes, this catoptron can reflect by two double-colored spectroscopical primary colors, makes its projected path parallel with the path of other twice primary colors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01143854 CN1425937A (en) | 2001-12-12 | 2001-12-12 | Projection display device with diffraction grating element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01143854 CN1425937A (en) | 2001-12-12 | 2001-12-12 | Projection display device with diffraction grating element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1425937A true CN1425937A (en) | 2003-06-25 |
Family
ID=4677258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01143854 Pending CN1425937A (en) | 2001-12-12 | 2001-12-12 | Projection display device with diffraction grating element |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1425937A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2396071A (en) * | 2002-12-06 | 2004-06-09 | Hitachi Ltd | Projection display utilising reflection/polarizing plates |
| CN100337143C (en) * | 2004-03-03 | 2007-09-12 | 株式会社日立制作所 | Optical unit and projection-type image display apparatus using the same |
| CN100462839C (en) * | 2004-12-11 | 2009-02-18 | 鸿富锦精密工业（深圳）有限公司 | Projector with micro lens |
| CN108474879A (en) * | 2016-01-06 | 2018-08-31 | 伊奎蒂公司 | Double-face imaging light guide with embedded dichroic filter |
-
2001
- 2001-12-12 CN CN 01143854 patent/CN1425937A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2396071A (en) * | 2002-12-06 | 2004-06-09 | Hitachi Ltd | Projection display utilising reflection/polarizing plates |
| GB2396071B (en) * | 2002-12-06 | 2005-02-09 | Hitachi Ltd | Projection type image display apparatus |
| CN100337143C (en) * | 2004-03-03 | 2007-09-12 | 株式会社日立制作所 | Optical unit and projection-type image display apparatus using the same |
| CN100462839C (en) * | 2004-12-11 | 2009-02-18 | 鸿富锦精密工业（深圳）有限公司 | Projector with micro lens |
| CN108474879A (en) * | 2016-01-06 | 2018-08-31 | 伊奎蒂公司 | Double-face imaging light guide with embedded dichroic filter |
| US10747001B2 (en) | 2016-01-06 | 2020-08-18 | Vuzix Corporation | Double-sided imaging light guide with embedded dichroic filters |
| CN108474879B (en) * | 2016-01-06 | 2020-11-03 | 伊奎蒂公司 | Double-sided imaging light guide with embedded dichroic filter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5283600A (en) | LCD projector | |
| US6005720A (en) | Reflective micro-display system | |
| US7690794B2 (en) | Image-combining device and projection display apparatus having image-combining devices incorporated therein | |
| CN1231788C (en) | Reflection image projector, projection type image display device and light source device | |
| JP3457590B2 (en) | X prism and projection system | |
| EP0389240A2 (en) | Polarizing beam splitter apparatus and light valve image projection system | |
| KR100393883B1 (en) | Liquid crystal structure with improved black state, and projector using same | |
| JP3417757B2 (en) | Liquid crystal display device and light beam separating method thereof | |
| US20080117385A1 (en) | Liquid crystal device and projector having the same | |
| EP0477028A2 (en) | Image projection system | |
| CN1425937A (en) | Projection display device with diffraction grating element | |
| WO2007021981A2 (en) | Contrast enhancement for liquid crystal based projection systems | |
| US7207676B2 (en) | Image projection apparatus | |
| US7365721B2 (en) | Projection display | |
| KR20050091769A (en) | Optical cores and projection systems containing the optical core | |
| CN212460210U (en) | Double-light-path stereoscopic projection system with refraction device | |
| CN1204437C (en) | Reflection type optical valve projection system | |
| JPH0812343B2 (en) | Image projection device | |
| JPH07128614A (en) | Image display device | |
| EP0083087B1 (en) | High efficiency optical tank for two-color liquid crystal light valve image projection with color selective prepolarization | |
| CN209117903U (en) | Wide-angle polarization splitting prism and bias colour 3D project light modulation system | |
| CN215895139U (en) | Polarization beam splitter and 3D projection light modulation system | |
| US11640083B2 (en) | Optical compensation apparatus and liquid-crystal display apparatus | |
| CN2655292Y (en) | Reflective liquid crystal projecting system | |
| JP3376001B2 (en) | Image projection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |