CN100373229C - Backlight module with diffraction optical element - Google Patents
Backlight module with diffraction optical element Download PDFInfo
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- CN100373229C CN100373229C CNB2004101029412A CN200410102941A CN100373229C CN 100373229 C CN100373229 C CN 100373229C CN B2004101029412 A CNB2004101029412 A CN B2004101029412A CN 200410102941 A CN200410102941 A CN 200410102941A CN 100373229 C CN100373229 C CN 100373229C
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- optical element
- light
- backlight module
- diffraction optical
- light source
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Abstract
The present invention provides a negative phototropism module with a diffracting optical element, which comprises a light source and a diffracting optical element, wherein the diffracting optical element is arranged above the light source. Through proper phase arrangement, the diffracting optical element can be adjusted to the front of light waves emitted by the light source to control the direction of light. The negative phototropism module provided by the present invention does not need to have a certain thickness because the diffracting optical element does not need a geometric form to deflect rays. Because before the design of the diffracting optical element, brightness homogenization and brightness maximization are considered, the purposes of light weight, thinness, shortness and small size are achieved. In addition, the functions of the diffracting element are difficult to affect by stress and therefore, complicated manufacturing process is not needed, which can reduce manufacturing cost.
Description
Technical field
The present invention relates to a kind of backlight module, particularly relate to a kind of backlight module that utilizes diffraction optical element to control diffused light source distribution and intensity.
Background technology
Known luminescence diode (LED) backlight module light source diffusion at present mainly is the lens that add particular design on light emitting diode.As the disclosed backlight module of U.S. Patent No. 6679621B2LUMILEDS, wherein type (edge-emitting) light emitting diode is penetrated on the limit in the LUMILEDS backlight module, promptly be to be installed on the light emitting diode, to strengthen the effect that even mixed light is penetrated on its limit with the special optical lens.But the lens curved surface of this method is subject to the processing procedure precision, thereby the manufacture difficulty height, and the thickness of lens is also thicker, causes significantly increasing the thickness of backlight module; In addition, in known direct type backlight module, the light guiding diffusion sheet that utilizes light-passing board earlier light source to be sent evenly diffuses to liquid crystal panel by diffusion sheet with light source again.Thus, because the light transmission deficiency of light-passing board itself, and need consider the evenly problem of diffusion simultaneously, therefore under the multilayer board configuration, can't reduce the thickness of whole backlight module.
Summary of the invention
In view of this, the invention provides a kind of backlight module, (Diffraction Optical Element DOE), is used to solve above-mentioned shortcoming to have diffraction optical element.
The invention provides a kind of backlight module, comprise a light source, and a diffraction optical element.Wherein, diffraction optical element is arranged at the light source top, and by suitable phase configuration, this diffraction optical element can be modulated the wavefront of the light wave that is sent by light source, with control direction of light and distribution.Wherein, regulate light to form a distribution of light, this distribution of light comprises one first one and one second one, and this position of first one is corresponding with this light source, avoids light to reflex to this light source, and this second one is the light concentration zones.
In the backlight module of the present invention, described light source is light emitting diode, fluorescent lamp, laser diode or other light sources.
In the backlight module of the present invention, described diffraction optical element is penetration, reflective diffraction optical element or folding diffraction-type composite optic element.
In the backlight module of the present invention, described diffraction optical element is plastic cement, glass, metal or other materials that is fit to.
In the backlight module of the present invention, described diffraction optical element uses ejection formation, roll extrusion, concora crush machinery processing mode to make.
Backlight module provided by the invention, because diffraction optical element itself does not need geometric configuration to come flexion light, thus certain thickness needn't be arranged, and at the beginning of the design diffraction optical element, promptly consider brightness uniformity and maximization, therefore can reach compact purpose.Moreover the diffraction element function is difficult for affected by force, so processing procedure that need not be complicated can reduce cost of manufacture.
Description of drawings
Fig. 1 a represents the synoptic diagram of first embodiment of the invention backlight module;
Fig. 1 b represents the synoptic diagram of second embodiment of the invention backlight module;
Fig. 2 represents the flow path switch figure of object plane wavefront function of the present invention;
Fig. 3 represents the synoptic diagram on picture plane in the first embodiment of the invention;
Fig. 4 represents the synoptic diagram of object plane in the first embodiment of the invention;
Fig. 5 represents the making step process flow diagram of diffraction optical element of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, cited below particularlyly go out preferred embodiment, and elaborate in conjunction with the accompanying drawings.
At first see also Fig. 1 a.Fig. 1 a represents the synoptic diagram of backlight module first embodiment of the present invention.In this embodiment, backlight module of the present invention is a direct type backlight module 100, comprising: a liquid crystal panel (not shown), a light source 111, a reflecting plate 113, and a diffraction optical element 112.Because all the other elements are not principal character of the present invention, thereby all do not list.Wherein, diffraction optical element 112 is arranged at the top of light source 111, and by suitable phase configuration, this diffraction optical element 112 can be modulated the wavefront of the light wave of being launched by light source 111, and then control direction of light and distribution, form required picture plane A (as shown in Figure 3).In addition, light source 111 is a light emitting diode.Present embodiment is used the reflective diffraction optical element, to form required picture plane A, sees also Fig. 3 and Fig. 4 in order to the light of reflection source.What Fig. 3 showed is to set as plane A to getting rid of zeroth order diffraction light (zero-order diffraction light) distribution of light sources afterwards, according to this wavefront function (phase function), by inverse Fourier transform shown in Figure 2 (Inverse Fourier Transform, IFT) function calculation, can draw the pairing PHASE DISTRIBUTION function of object plane, as shown in Figure 4.Then more according to this PHASE DISTRIBUTION function produce required diffraction optical element 112.The framework of first embodiment of the invention is reflective light source diffusion way, and LED source 111 is before and after diffraction optical element 112 modulating waves, and the distribution of reflection source will be as shown in Figure 3.Distribution of light sources comprises one first P1 and one second P2, first P1 is corresponding with light source, and first P1 the light that is provided by light source 111 can be provided pass (as shown in Figure 1) or directly reflex to 111, the second P2 of light source and be distributed as the light concentration zones ringwise.And second one is the distribution of light sources design of open circles, removes and avoids light to reflex to light source 111, causes outside the element heating, and the thickness of backlight module light source diffused component is minimized.Concrete method for making as for diffraction optical element 112 will be explained below.
See also Fig. 1 b again.Fig. 1 b represents the synoptic diagram of backlight module second embodiment of the present invention.As shown in the figure, backlight module of the present invention is a direct type backlight module 200, comprising: a liquid crystal panel (not shown), a light source 211, a reflecting plate 213, and a diffraction optical element 212.Wherein, light source 211 is a light emitting diode.In the present embodiment, diffraction optical element 212 is the penetration diffraction optical element, but also can be reflective diffraction optical element or folding diffraction-type composite optic element, decides on user's needs, it is used for and will penetrates the light of diffraction optical element 212, forms required picture plane.For example, for making panel surface brightness even, the planar light source distributed pole of homogenising is important, so it is identical with the aforementioned first embodiment step, the earlier default equally distributed picture plane wave front of light source function again by inverse Fourier transform function calculation shown in Figure 2, can draw the pairing PHASE DISTRIBUTION function of object plane, and then the PHASE DISTRIBUTION function is produced required diffraction optical element 212 according to this, can reach the purpose that light source is evenly spread.Concrete method for making as for diffraction optical element 212 will be explained below.
In fact, diffraction optical element of the present invention, also can be applicable to the limit and penetrate the type backlight module, utilize reflective diffraction element of the present invention to carry out reflex action earlier the light that light source sent, to form required distribution of light sources, be radiated to again on the liquid crystal panel, promptly replace the function that reflecting plate in the type backlight module is penetrated on existing limit, and reach light and use optimized effect.
Then please refer to Fig. 5.Figure 5 shows that the making step process flow diagram of diffraction optical element of the present invention.Its making step is as follows: step S1, on as the plane, set distribution of light sources, promptly simulate at the required diffused light source shape of system, uniformity coefficient and Luminance Distribution for backlight module, and then calculate the wavefront function of object plane with inverse Fourier transform, through repeated calculation, can obtain last wavefront function, the PHASE DISTRIBUTION function that this wavefront function is aforementioned diffraction optical element; Step S2 is converted to the required mask of lithographic process with the phase encoding of diffraction optical element, uses semiconductor technology again and earlier produces photoresist structure with gold-tinted photoetching or beamwriter lithography on silicon wafer or glass substrate, and etch desired structure; Step S3 utilizes silicon wafer or glass substrate to produce the metal die for prototype and with the electroforming mould rotating technology; At last, promptly step S4 utilizes this die to carry out the step of a large amount of manufacturing machine process technologies, waits the making of finishing diffraction optical element as ejection formation, roll extrusion, concora crush.Diffraction optical element can be plastic cement, metal or other materials that is fit to, and decides on user's needs.
In sum, the invention provides a kind of backlight module, wherein applied diffraction optical element except programmable and optimized distribution of light sources can be provided, also can and then really reach and makes panel luminance homogenising, maximized function.
Though the present invention by the preferred embodiment explanation as above, this preferred embodiment is not in order to limit the present invention.Those skilled in the art without departing from the spirit and scope of the present invention, should have the ability this preferred embodiment is made various changes and replenished, so protection scope of the present invention is as the criterion with the scope of claims.
Being simply described as follows of symbol in the accompanying drawing:
100: direct type backlight module 211: light source
111: light source 212: diffraction optical element
112: diffraction optical element 213: reflecting plate
113: reflecting plate A: as the plane
200: direct type backlight module
Claims (6)
1. backlight module is characterized in that comprising:
One light source; And
One diffraction optical element is arranged at the top of this light source, regulates light to form a distribution of light, this distribution of light comprises one first one and one second one, this position of first one is corresponding with this light source, avoids light to reflex to this light source, and this second one is the light concentration zones.
2. backlight module according to claim 1 is characterized in that: described light source is light emitting diode, fluorescent lamp, laser diode or other light sources.
3. backlight module according to claim 1 is characterized in that: described diffraction optical element is penetration, reflective diffraction optical element or folding diffraction-type composite optic element.
4. backlight module according to claim 1 is characterized in that: described diffraction optical element has the function of distribution of light modulated phase of line and direction.
5. backlight module according to claim 1 is characterized in that: described diffraction optical element is made by plastic cement, glass material or metal material.
6. backlight module according to claim 1 is characterized in that: described diffraction optical element uses ejection formation, roll extrusion, concora crush machinery processing mode to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004101029412A CN100373229C (en) | 2004-12-31 | 2004-12-31 | Backlight module with diffraction optical element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004101029412A CN100373229C (en) | 2004-12-31 | 2004-12-31 | Backlight module with diffraction optical element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1800939A CN1800939A (en) | 2006-07-12 |
| CN100373229C true CN100373229C (en) | 2008-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004101029412A Expired - Fee Related CN100373229C (en) | 2004-12-31 | 2004-12-31 | Backlight module with diffraction optical element |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287714A (en) * | 2011-08-19 | 2011-12-21 | 上海交通大学 | Backlight system with optical grating |
| CN102375171B (en) | 2011-11-09 | 2013-10-02 | 中国科学院物理研究所 | Diffractive optical element and design method thereof and application of diffractive optical element in solar battery |
| CN111812887A (en) * | 2019-04-11 | 2020-10-23 | 合肥工业大学 | Laser backlight module and liquid crystal display using same |
| CN110262129B (en) * | 2019-06-19 | 2022-11-11 | 合肥工业大学 | Backlight module and liquid crystal display using same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04303822A (en) * | 1991-04-01 | 1992-10-27 | Yazaki Corp | Backlight for transmission type display element |
| JP2002062528A (en) * | 2000-08-21 | 2002-02-28 | Keiwa Inc | Backlight unit |
| US20030184993A1 (en) * | 2002-03-26 | 2003-10-02 | Katsuaki Yamada | Backlight and liquid crystal display device employing it |
| CN1696785A (en) * | 2004-05-10 | 2005-11-16 | 辅祥实业股份有限公司 | Full run-down type backlight source module of using control of plane function |
-
2004
- 2004-12-31 CN CNB2004101029412A patent/CN100373229C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04303822A (en) * | 1991-04-01 | 1992-10-27 | Yazaki Corp | Backlight for transmission type display element |
| JP2002062528A (en) * | 2000-08-21 | 2002-02-28 | Keiwa Inc | Backlight unit |
| US20030184993A1 (en) * | 2002-03-26 | 2003-10-02 | Katsuaki Yamada | Backlight and liquid crystal display device employing it |
| CN1696785A (en) * | 2004-05-10 | 2005-11-16 | 辅祥实业股份有限公司 | Full run-down type backlight source module of using control of plane function |
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| CN1800939A (en) | 2006-07-12 |
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