CN1601352A - Polarized light source - Google Patents
Polarized light source Download PDFInfo
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- CN1601352A CN1601352A CNA031544193A CN03154419A CN1601352A CN 1601352 A CN1601352 A CN 1601352A CN A031544193 A CNA031544193 A CN A031544193A CN 03154419 A CN03154419 A CN 03154419A CN 1601352 A CN1601352 A CN 1601352A
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- light source
- polarized light
- pedestal
- optical splitter
- specific polarization
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Abstract
The invention discloses a polarized light source. Its main structure includes at least a non-polarized light source capable of sending light ray, a reflected polarization optical splitter through which the specific polarized light can be passed, a reflecting surface for reflecting light ray and a phase conversion device capable of changing polarized state of light ray. Said invention can utilize the proper configuration of reflecting surface and phase conversion device on the forward line of light to make non-polarized light be converted into specific polarized light and exited from the structure of polarized light source.
Description
Technical field
The present invention relates to a kind of polarized light source, more particularly, especially relevant for a kind of light source module that sends specific linearly polarized photon.
Prior art
In recent years, because LCD (LCD, Liquid Crystal Display) has advantages such as frivolous, low voltage drive and low consumpting power, therefore significantly be applied to the screen of desktop, mobile computer, even the trend that replaces traditional crt display gradually arranged, also because so, in the middle of its correlation technique just constantly develops.
The primary structure of direct viewing type and projection type liquid crystal display comprises light source, liquid crystal panel and lays respectively at two polarisation assemblies of both sides, liquid crystal panel front and back.After light is sent by light source, arrive the polarisation assembly of liquid crystal panel near light source side, have the light of half to pass through this moment approximately, and the light of half is then absorbed or reflects by the polarisation assembly approximately in addition.Thereafter, the light that passes through presents image by the polarisation assembly of liquid crystal panel and opposite side.
As mentioned above, because most at present LCD is all utilized the next main body as illuminator of unpolarized light source such as fluorescence light source or gases at high pressure, therefore after light passes through the polarisation assembly of light source side, there is the light of half to be absorbed approximately, only has the light of half can supply to utilize.This makes the light utilization ratio of whole LCD significantly reduce, and also brings problems such as system radiating and environmental protection.
In view of this, if a kind of light source that can effectively send linearly polarized photon can be provided, and other assembly of the LCD of suitably arranging in pairs or groups, must significantly improve its light utilization ratio, improve the problem and the shortcoming of available liquid crystal display.
Summary of the invention
Therefore purpose of the present invention promptly is to be to provide a kind of polarized light source, and it can be converted to specific polarization light with non-polarized light efficiently and be penetrated.If be applied to LCD, the light utilization ratio and the brightness that can significantly improve LCD.
According to the first embodiment of the present invention, a kind of polarized light source is provided, it comprises: at least one non-polarized light source; One reflecting type polarizing optical splitter in order to allowing a specific polarization light of this non-polarized light source by (A type polarized light), and reflects another specific polarization light (Type B polarized light); One reflecting surface is used for reflecting the Type B polarized light that this reflecting type polarizing optical splitter is reflected; And a phase transition device, be arranged between this reflecting surface and this reflecting type polarizing optical splitter, so that this another specific polarization light,, being converted to A type polarized light, and then can pass through this reflecting type polarizing optical splitter by this phase transition device secondary.
According to the second embodiment of the present invention, a kind of polarized light source is provided, it comprises: a reverberator, be container-like and have an opening and an inside surface, but its inside surface reflection ray; One pedestal is positioned on the inside surface of this reverberator; At least one light emitting diode is positioned on this pedestal and circuit is connected in this pedestal, is used as light source; One quarter-wave plate covers and seals the opening of this reverberator, so that this pedestal is arranged in the enclosure space that is surrounded by this reverberator and this quarter-wave plate with this at least one light emitting diode; An and reflecting type polarizing optical splitter, be positioned on this quarter-wave plate, in order to allow a specific polarization light (A type polarized light) of this light source pass through, and reflect another specific polarization light (Type B polarized light), this quarter-wave plate wherein is set, so that the Type B polarized light that is reflected by this reflecting type polarizing optical splitter is converted to this A type polarized light by behind twice this quarter-wave plate.
According to the third embodiment of the present invention, a kind of polarized light source is provided, it comprises: a reverberator, be container-like and have an opening and an inside surface, but its inside surface reflection ray; One pedestal is positioned on the inside surface of this reverberator, and it has the function of quarter-wave plate; At least one light emitting diode is positioned on this pedestal and is electrically connected at this pedestal, is used as light source; An and reflecting type polarizing optical splitter, cover and seal the opening of this reverberator, so that this pedestal is arranged in the enclosure space that is surrounded by this reverberator and this reflecting type polarizing optical splitter with this at least one light emitting diode, and this reflecting type polarizing optical splitter is used so that a specific polarization light of this light source (A type polarized light) passes through, and reflect another specific polarization light (Type B polarized light), this pedestal wherein is set, so that the Type B polarized light that is reflected by this reflecting type polarizing optical splitter is converted to this A type polarized light by behind twice this pedestal.
By polarized light source of the present invention, can send linearly polarized photon efficiently, thereby improve the shortcoming and the problem of available liquid crystal display.
The accompanying drawing simple declaration
Fig. 1 is the drawing in side sectional elevation according to the polarized light source of first embodiment of the invention;
Fig. 2 is the drawing in side sectional elevation according to the polarized light source of second embodiment of the invention;
Fig. 3 is the drawing in side sectional elevation according to the polarized light source of third embodiment of the invention.
The element numbers explanation:
11,21,31 reverberators
11a, 21a, 31a high refractive index layer
12,22,32 pedestals
13,23,33 light emitting diodes
The 13a luminous zone
The 13b electrode
14,24 quarter-wave plates
15,25,35 reflecting type polarizing optical splitters
The 22a high refractive index layer
Embodiment
Next describe conjunction with figs. in detail the preferred embodiments of the present invention, wherein identical assembly will be represented with similar sign.
According to polarized light source of the present invention, its primary structure comprise at least one non-polarized light source that emits beam, can make specific polarization light by and make the reflecting type polarizing optical splitter, of another type polarized light reflection be used for reflection ray reflecting surface, with a phase transition device that can change the polarization of light attitude.The function and the configuration of each assembly are described in detail as follows.
First embodiment
Fig. 1 is the drawing in side sectional elevation according to the polarized light source of first embodiment of the invention.As shown in Figure 1, the polarized light source of first embodiment comprises a reverberator 11 with groove, and the inside surface 11a in its groove can be used to reflection ray, and in the present embodiment, total inner surface 11a can be a high refractive index layer.One pedestal 12 is set on the inside surface 11a in reverberator 11 grooves, and in this embodiment, in order to increase the radiating effect of system, pedestal 12 can be made up of a high heat transfer material.At least one light emitting diode 13 then is set as light source on pedestal 12, its lead with pedestal 12 is connected.In order to promote brightness, light emitting diode 13 can be connected (as shown in Figure 1) with the lead of pedestal 12 by the mode of covering crystalline substance (flip-chip), in addition, ideally, the electrode 13b of light emitting diode 13 is preferably transparency electrode, and for instance, this transparency electrode can be made up of indium tin oxide (ITO).
In addition, at the opening part of reverberator 11 grooves one quarter-wave plate 14 is set, it covers the opening of reverberator 11 fully, so makes pedestal 12 and light emitting diode 13 be arranged in the enclosure space that is surrounded by reverberator 11 and quarter-wave plate 14.Quarter-wave plate 14 is as a phase transition device in this embodiment, can make linearly polarized photon by quarter-wave plate 14 after twice, rotate its polarization state 90 degree, for instance, the S polarized light can be converted to the P polarized light by quarter-wave plate 14 after twice, and the P polarized light then can be converted to the S polarized light by quarter-wave plate 14 after twice.At last, one reflecting type polarizing optical splitter 15 is set and the one-piece construction of formation polarized light source on quarter-wave plate 14, the specific polarization light that reflecting type polarizing optical splitter 15 can make light emitting diode 13 be launched passes through (as the S polarized light), and reflects another specific polarization light (as the P polarized light).In this embodiment, utilize a wiregrating polarisation optical splitter (wire grid polarizer) to come as reflecting type polarizing optical splitter 15.
Next the mode of the polarized light source running of this embodiment is described.As shown in Figure 1, after non-polarized light was sent by the luminous zone 13a of light emitting diode, because quarter-wave plate can't change the state of non-polarized light, therefore the light that makes progress was by still being non-polarized light behind the quarter-wave plate 14.Then, the non-polarized light that makes progress arrives reflecting type polarizing optical splitter 15, and at this moment, a specific polarization light (as the S polarized light) can pass reflecting type polarizing optical splitter 15 and arrive the external world, and another specific polarization light (as the P polarized light) then is reflected downwards.Subsequently, the P polarized light that is reflected becomes circularly polarized light after by quarter-wave plate 14, and continues to propagate by light emitting diode 13 and pedestal 12 downwards.After, this circularly polarized light be reflected device 11 inside surface 11a reflection upwards, by being converted into the S polarized light behind the quarter-wave plate 14, at last by reflecting type polarizing optical splitter 15.
In addition on the one hand, the downward non-polarized light by the luminous zone 13a of light emitting diode 13 is sent earlier through the inside surface 11a of reverberator 11 reflection upwards, arrives reflecting type polarizing optical splitters 15 by quarter-wave plate 14 backs.As mentioned above, the S polarized light can pass reflecting type polarizing optical splitter 15 and arrive extraneously, and the P polarized light then is reflected downwards, thereafter, the P polarized light via the last period described identical mechanism be converted into the S polarized light and pass through reflecting type polarizing optical splitter 15.In addition, because light emitting diode 13 is enclosed in by in reverberator 11 and the quarter-wave plate 14 formed enclosure spaces, and the total inner surface 11a of reverberator 11 is high refractive index layer, therefore light emitting diode 13 can be reflected and propagate in enclosure space toward the light of side emission, and can be with aforesaid mechanism, be converted to the S polarized light fully and by reflecting type polarizing optical splitter 15.
As above-mentioned example, by quarter-wave plate 14, reflecting type polarizing optical splitter 15, with reverberator 11 formed mechanism and structures, only specific polarization light (being the S polarized light among this embodiment) is able to thus that polarized light source penetrates.In addition, because light emitting diode 13 is enclosed in by in reverberator 11 and the quarter-wave plate 14 formed enclosure spaces, so the non-polarized light that light emitting diode 13 is sent can constantly be propagated in this enclosure space, pass through reflecting type polarizing optical splitter 15 up to being converted into the S polarized light fully, so the light that polarized light source of the present invention can be sent light emitting diode 13 effectively is converted to the S polarized light.Note that herein in this embodiment, only the S polarized light is able to by reflecting type polarizing optical splitter 15, yet suitable configuration reflecting type polarizing optical splitter 15 and quarter-wave plate 14 also can make polarized light source only send other specific polarization light (as the P polarized light).
Second embodiment
Fig. 2 is the drawing in side sectional elevation according to the polarized light source of second embodiment of the invention.The polarized light source structure and first embodiment of second embodiment are roughly the same, different be in: the upper surface 22a of pedestal 22 is coated with a high refractive index layer, and the inside surface of reverberator 21 except with zone that pedestal 22 is connected, be a high refractive index layer 21a.As shown in Figure 2, the polarized light source function mode of second embodiment is similar to first embodiment, the non-polarized light that is sent by light emitting diode 23, can constantly in reverberator 21 and quarter-wave plate 24 formed enclosure spaces, propagate, and reflected by the high refractive index layer 21a of the upper surface 22a of pedestal 22 and reverberator 21 inside surfaces, to be converted to specific polarization light fully at last, pass reflecting type polarizing optical splitter 25 and the arrival external world.Compare with first embodiment,, therefore can reduce the loss that partly transmission caused, so the polarized light source of second embodiment can more efficiently be converted to specific polarization light with non-polarized light because light can not pass through pedestal 22.
The 3rd embodiment
Fig. 3 is the drawing in side sectional elevation according to the polarized light source of third embodiment of the invention.As shown in Figure 3, the polarized light source structure of the 3rd embodiment is also roughly the same with first embodiment, different be in: pedestal 32 is made into function with quarter-wave plate, therefore need not prepare other quarter-wave plate, in this embodiment, pedestal 32 can be made up of a birefringent medium material; In addition, reflecting type polarizing optical splitter 35 covers the opening of reverberator 31 fully, so makes pedestal 32 and light emitting diode 33 be arranged in the enclosure space that is surrounded by reverberator 31 and reflecting type polarizing optical splitter 35.
Same, the non-polarized light that light emitting diode 33 is sent can constantly be propagated in this enclosure space, up to being converted to specific polarization light by pedestal 32 fully, passes reflecting type polarizing optical splitter 35 and the arrival external world.In this embodiment, because light need not pass through other quarter-wave plate, therefore can reduce the loss that partly transmission caused, so can improve the light utilization ratio of polarized light source.In addition, owing to need not prepare other quarter-wave plate, therefore can reduce the cost of polarized light source.
Clearly, those skilled in the art is not in leaving spirit of the present invention and scope, when carrying out various modifications and variation to the present invention.Therefore all variations that equate with the claim meaning all should be contained in of the present invention in.
Claims (12)
1. polarized light source comprises:
At least one non-polarized light source;
One reflecting type polarizing optical splitter in order to allowing a specific polarization light of this non-polarized light source pass through, and reflects another specific polarization light;
One reflecting surface is in order to reflect another specific polarization light that this reflecting type polarizing optical splitter is reflected; And
One phase transition device is located between this reflecting surface and this reflecting type polarizing optical splitter, so that this another specific polarization light, by this phase transition device secondary;
By this phase transition device two this another specific polarization light that takes second place, be converted to this specific polarization light, and by this reflecting type polarizing optical splitter.
2. polarized light source as claimed in claim 1, wherein this phase transition device is a quarter-wave plate.
3. polarized light source comprises:
One reverberator is container-like and has an opening and an inside surface, but its inside surface reflection ray;
One pedestal is positioned on the inside surface of this reverberator;
At least one light emitting diode is positioned on this pedestal and lead is connected in this pedestal, is used as light source;
One quarter-wave plate covers and seals the opening of this reverberator, makes this pedestal and this at least one light emitting diode be arranged in the enclosure space that is surrounded by this reverberator and this quarter-wave plate; And
One reflecting type polarizing optical splitter is positioned on this quarter-wave plate, in order to allowing a specific polarization light of this light source pass through, and reflects another specific polarization light,
This quarter-wave plate wherein is set, makes another specific polarization light of being reflected by this reflecting type polarizing optical splitter, be converted to this specific polarization light by behind twice this quarter-wave plate.
4. polarized light source as claimed in claim 3, wherein this pedestal is made up of a high heat transfer material.
5. polarized light source as claimed in claim 3, wherein the electrode of this at least one light emitting diode is a transparency electrode.
6. polarized light source as claimed in claim 3, wherein this reflecting type polarizing optical splitter is a wiregrating polarisation optical splitter.
7. polarized light source as claimed in claim 3 wherein is coated with a high refractive index layer on the surface of this pedestal near the opening of this reverberator.
8. polarized light source as claimed in claim 7, wherein the inside surface of this reverberator except with zone that this pedestal is connected, be a high refractive index layer.
9. polarized light source comprises:
One reverberator is container-like and has an opening and an inside surface, but its inside surface reflection ray;
One pedestal is positioned on the inside surface of this reverberator, and it has the function of quarter-wave plate;
At least one light emitting diode is positioned on this pedestal and is electrically connected at this pedestal, is used as light source; And
One reflecting type polarizing optical splitter, cover and seal the opening of this reverberator, so that this pedestal is arranged in the enclosure space that is surrounded by this reverberator and this reflecting type polarizing optical splitter with this at least one light emitting diode, and this reflecting type polarizing optical splitter is used so that a specific polarization light of this light source passes through, and reflect another specific polarization light
This pedestal wherein is set, so that another specific polarization light that is reflected by this reflecting type polarizing optical splitter is converted to this specific polarization light by behind twice this pedestal.
10. polarized light source as claimed in claim 9, wherein this pedestal is made up of a birefringent medium material.
11. polarized light source as claimed in claim 9, wherein the electrode of this at least one light emitting diode is a transparency electrode.
12. polarized light source as claimed in claim 9, wherein this reflecting type polarizing optical splitter is a wiregrating polarisation optical splitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031544193A CN1601352A (en) | 2003-09-27 | 2003-09-27 | Polarized light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031544193A CN1601352A (en) | 2003-09-27 | 2003-09-27 | Polarized light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1601352A true CN1601352A (en) | 2005-03-30 |
Family
ID=34659974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031544193A Pending CN1601352A (en) | 2003-09-27 | 2003-09-27 | Polarized light source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1601352A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100449809C (en) * | 2005-10-11 | 2009-01-07 | 精工爱普生株式会社 | Light-emitting device, method for manufacturing light-emitting device, and image display apparatus |
| CN101334558B (en) * | 2007-06-29 | 2011-04-20 | 群康科技(深圳)有限公司 | Backlight module group and LCD device |
| CN106292054A (en) * | 2015-05-19 | 2017-01-04 | 青岛海信电器股份有限公司 | A kind of liquid crystal display module and LCD TV |
-
2003
- 2003-09-27 CN CNA031544193A patent/CN1601352A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100449809C (en) * | 2005-10-11 | 2009-01-07 | 精工爱普生株式会社 | Light-emitting device, method for manufacturing light-emitting device, and image display apparatus |
| CN101334558B (en) * | 2007-06-29 | 2011-04-20 | 群康科技(深圳)有限公司 | Backlight module group and LCD device |
| US8259255B2 (en) | 2007-06-29 | 2012-09-04 | Chimei Innolux Corporation | Backlight module and liquid crystal display using same |
| CN106292054A (en) * | 2015-05-19 | 2017-01-04 | 青岛海信电器股份有限公司 | A kind of liquid crystal display module and LCD TV |
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