CN100381904C - Full run-down type backlight source module of using control of plane function - Google Patents
Full run-down type backlight source module of using control of plane function Download PDFInfo
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- CN100381904C CN100381904C CNB2004100421755A CN200410042175A CN100381904C CN 100381904 C CN100381904 C CN 100381904C CN B2004100421755 A CNB2004100421755 A CN B2004100421755A CN 200410042175 A CN200410042175 A CN 200410042175A CN 100381904 C CN100381904 C CN 100381904C
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- surface profile
- light
- direct
- type backlight
- fluorescent tube
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Abstract
The present invention relates to a vertical backlight source module controlled by a plane function. The backlight source module comprises a frame, at least one lamp tube, a reflection piece and a diffusion board, wherein the lamp tube is firmly arranged on the frame; the reflection piece is arranged on the frame and is positioned below the lamp tube; the diffusion board is arranged on the frame and is positioned above the lamp tube. The diffusion board is provided with at least one light transmission board; at least one side face of the light transmission board directly forms a surface profile which is composed of a plurality of optical transform units to form a scheduled pattern. The pattern is obtained by basing the relative space position of the diffusion board relative to the lamp tube and the reflection piece and utilizing a proper plane function to transform.
Description
Technical field
The present invention is relevant with liquid crystal indicator, particularly about a kind of direct-light-type backlight module of application surface functions control.
Background technology
General LCD mainly is made up of a liquid crystal panel and a backlight source module, and wherein liquid crystal panel itself is not luminous, and the light source of panel then is to be provided by module backlight.And known backlit source module can be divided into two kinds of straight-down negative and side entering types.
The backlight source module of straight-down negative includes a framework substantially, one or several cold cathode fluorescent lamp (ColdCathode Fluorescent Lamps, CCFLs) be installed in this framework, one diffuser plate is fixed in this framework, be positioned at the top of fluorescent tube, and a reflector plate, be located at this framework, be positioned at the below of this fluorescent tube.The function of this diffuser plate is to spread the light source that fluorescent tube sends, and makes it form a uniform surface light source.And the function of reflecting plate is to make it enter diffuser plate the light reflection of fluorescent tube emission downwards.
The purpose that is provided with of this diffuser plate is that the light source that fluorescent tube is sent spreads, and makes it become a uniform surface light source, and is projected to liquid crystal panel.And general diffuser plate is that light tight or semi-transparent material (for example organic filling material (organic fillers)) is set in a transparent substrates, with the light source in reflection or absorption precalculated position.
Aforementioned diffusion principle is to cover the part source region that these fluorescent tubes produce the big zone of briliancy in the light source.Such practice can make the briliancy of the light source that passes diffuser plate reduce.For requiring backlight source module to require the design concept of high briliancy to disagree now.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of direct-light-type backlight module of application surface functions control, and it can provide bigger briliancy and angle of visibility.
For achieving the above object, the direct-light-type backlight module of application surface functions control provided by the present invention includes:
One framework;
At least one fluorescent tube firmly is arranged at this framework;
One reflector plate is arranged at this framework, is positioned at this fluorescent tube below, and
One diffuser plate is arranged at this framework, is positioned at this fluorescent tube top;
Wherein this diffuser plate has at least one printing opacity plate, one side direct forming has a surface profile (surface profile), and this surface profile by a plurality of optical conversion units (opticaltransform units) composition to form a predetermined layout (pattern), these optical conversion units have a predetermined depth and a preset width respectively, to change light by the path behind this surface profile.
Wherein this diffuser plate all respectively is provided with a surface profile in opposite two sides of this transparent substrates.
Wherein this diffuser plate has two transparent substrates, and a side of each transparent substrates has a surface profile respectively.
The surface profile on this two transparent substrates wherein, one of them is positioned at the side in the face of these fluorescent tubes, and another person is positioned at the side back to these fluorescent tubes.
Wherein the surface profile on this two transparent substrates lays respectively at the side in the face of these fluorescent tubes.
Wherein the surface profile on this two transparent substrates lays respectively at the side back to these fluorescent tubes.
Wherein this surface profile have at least one part the width of optical conversion unit less than 10 μ m, make the light source that produces by these fluorescent tubes when passing this surface profile, produce the phenomenon of diffraction.
Wherein this surface profile has the degree of depth of optical conversion unit of at least one part between 1-20 times of wavelength (going into).
Wherein this surface profile be according to this by the relative tertiary location of each element in the optical mode group, it is resultant to utilize a predefined function to calculate.
Description of drawings
In order to describe structure of the present invention and characteristics place in detail, lift following preferred embodiment and cooperation
Description of drawings as after, wherein:
Fig. 1 is the exploded view of the present invention's first preferred embodiment;
Fig. 2 is the side sectional view of the present invention's first preferred embodiment;
Fig. 3 is the enlarged side view of the diffuser plate of the present invention's first preferred embodiment;
Fig. 4 is the amplification stereogram of the diffuser plate of the present invention's first preferred embodiment;
Fig. 5 is the visual angle and the light intensity figure of the present invention's first preferred embodiment;
Fig. 6 is the enlarged side view of the diffuser plate of the present invention's second preferred embodiment;
Fig. 7 is the visual angle and the light intensity figure of the present invention's second preferred embodiment;
Fig. 8 is the enlarged side view of the diffuser plate of the present invention's the 3rd preferred embodiment, and
Fig. 9 is the enlarged side view of the diffuser plate of the present invention's the 4th preferred embodiment.
Embodiment
See also shown in Figure 1ly, the direct-light-type backlight module of the application surface functions control that the present invention's first preferred embodiment is provided includes:
One framework 10 is made up of a base 12 and a upper ledge 14, and wherein this upper ledge has a form 16.
Three fluorescent tubes 18, the embodiment of the invention are three cold cathode fluorescent lamp that take the shape of the letter U (Cold CathodeFluorescent Lamps, CCFLs)), and it has, and caliber is thin, the life-span is long and the light efficiency advantages of higher.These fluorescent tubes 18 firmly are fixed in this base 12, and connect and to put a transformer (not shown), the electric power of necessity when providing these fluorescent tubes 18 to produce light sources.In fact, the quantity of these fluorescent tubes 18 and transformer and shape are when deciding on the specification of backlight source module.
One reflector plate 22 is fixed in this base 12, is positioned at the below of these fluorescent tubes 18.
One diffuser plate 24 is fixed in this base 12, is positioned at the top of these fluorescent tubes 18.
Two side plates 26 are located at fluorescent tube 18 2 sides, in order to fix these fluorescent tubes 18.
See also shown in Figure 3ly, this diffuser plate 24 has a transparent substrates 28, and has a predetermined surface profile (surface profile) 30 in a side direct forming one of this transparent substrates 28.
This surface profile 30 has a predetermined layout (pattern), it is according in this backlight source module, the relative tertiary location of this diffuser plate 24 and other each elements (as: these fluorescent tubes 18, this reflector plate 22), and some restriction important document (for example luminance range that is required of this backlight source module and angle of visibility scope etc.) of setting up on their own of deviser, by the mode of Project on Convex Set (POCS) in the numerical analysis, obtain the convergence and the optimization of design result via the framework mode of pulling over the weights between adjustment element transfer function.
Diffuser plate 24 of the present invention is the changes that changed light conduct route by the variation of surface profile 30, the variation that promptly is the structure of surface profile 30 is to make different case depths on the surface of this transparent substrates 28, or be called optical conversion unit (optical transform units 31), yet this diffuser plate 24 can change the variable quantity of light conduct route and will change with the size (cell size of processing procedure) of the optical conversion unit 31 of the structure of optical element thereupon, if desire to reach light uniformization and the high-penetration degree requirement of High variation amount that changes light conduct route, then need and to reach this result with more accurate processing procedure (Pixel is little) to reach this diffuser plate 24.
But the pixel (Pixel) with this surface profile 30 is dwindled, the conduct mode of light will no longer be simulated in the mode of geometrical optics, being only enough but need to be simulated in the mode of diffraction, and will be that mode with Fu Liye conversion (Fourier Transfer) is similar at optical principle the inside x-ray diffraction.
Each element can't change in time in module backlight, still all elements can be integrated design and merge to make.So both can reduce the difficulty of setting up the space and setting up, also can reduce the energy attenuation of light, improve the diffraction efficient of whole back light system.
According to inventor's actual tests result, utilize Yang Ou algorithm (Y-G Algorithm) can obtain the surface profile 30 of comparatively approaching real phase place.And this surface profile 30 can etching, mode such as printing or electroforming.
Another feature of the present invention is, the surface profile 30 of the diffuser plate 24 that we provide, and the height and the width of its each phase place (phase) can be inequality.Traditional mode is to utilize phase place to divide equally to be similar to the actual phase that is arrived.And our rule of doing is not to decide etch depth according to traditional phase place mode of dividing equally.We will suppose that the etch depth on each rank and width all can be different.Then under all height and width combination, must there be a certain combination to have far field (Far-Field) diffraction result preferably so down.The formula that calculates phase place is as follows:
See also shown in Figure 4ly, it is the surface profile 30 of this diffuser plate 24 of microscopically, and the material of its transparent substrates 28 is that (for example: polymethylmethacrylate (PolymethylMethacrylate, PMMA)), thickness is about 2mm to high molecular polymer.This surface profile 30 is made up of a plurality of optical conversion units (optical transform units), and each optical conversion unit has a predetermined altitude and width.Respectively the width of this optical conversion unit is greatly about 0.5:m-10:m, and the degree of depth is about 1-20 times of wavelength (going into).
Fig. 5 be this diffuser plate 24 with the RGB three primary colors respectively under different visual angles before optical element formed optical profile situation, the result learns thus, RGB three looks all can obtain the result of homogenising and high-penetration degree (greater than 60%) at left and right sides 60o, but wherein performance characteristic its penetration under the PMMA material of R primary colors is relatively poor.
The diffuser plate 32 that the present invention's second preferred embodiment is provided sees also shown in Figure 6ly, and its two sides at transparent substrates 34 all have a surface profile 36,38, and this two surface profile 36,38 respectively has a predetermined layout (pattern).The manufacturing process of this two surface profile 36,38 is identical with first preferred embodiment.
This diffuser plate 32 of Fig. 7 with the RGB three primary colors respectively under different visual angles before optical element formed optical profile situation, the result learns thus, the R primary colors is behind this two surface profile 36, its penetration was to upgrade 70%.
Fig. 8 shows the diffuser plate 40 of the present invention's the 3rd preferred embodiment, and it has two transparent substrates 42,44, and a side of each transparent substrates 42,44 respectively has a surface profile 43,45.Wherein a surface profile 43 is sides that are positioned in the face of the fluorescent tube (not shown), and another surface profile 43 then is positioned the side back to fluorescent tube.
Fig. 9 shows the diffuser plate 46 of the present invention's the 4th preferred embodiment, and it has two transparent substrates 48,50, and a side of each transparent substrates 48,50 respectively has a surface profile 49,41.This two surface profile 49,41 is in the side in the face of (or back to) fluorescent tube.
Claims (8)
1. the direct-light-type backlight module of an application surface functions control includes:
One framework;
At least one fluorescent tube firmly is arranged at this framework;
One reflector plate is arranged at this framework, is positioned at this fluorescent tube below, and
One diffuser plate is arranged at this framework, is positioned at this fluorescent tube top;
Wherein this diffuser plate has at least one transparent substrates, one side direct forming has a surface profile, and this surface profile by a plurality of optical conversion unit composition to form a predetermined layout, these a plurality of optical conversion units have a predetermined depth and a preset width respectively, to change light by the path behind this surface profile;
Wherein this surface profile have at least one part the width of optical conversion unit less than 10um, make the light source that produces by fluorescent tube when passing this surface profile, produce the phenomenon of diffraction.
2. according to the direct-light-type backlight module of the described application surface functions control of claim 1, it is characterized in that wherein this diffuser plate all respectively is provided with a surface profile in opposite two sides of this transparent substrates.
3. according to the direct-light-type backlight module of the described application surface functions control of claim 1, it is characterized in that wherein this diffuser plate has two transparent substrates, and a side of each transparent substrates has a surface profile respectively.
4. according to the direct-light-type backlight module of the described application surface functions control of claim 3, it is characterized in that, the surface profile on this two transparent substrates wherein, one of them is positioned at the side in the face of this fluorescent tube, and another person is positioned at the side back to this fluorescent tube.
5. according to the direct-light-type backlight module of the described application surface functions control of claim 3, it is characterized in that wherein the surface profile on this two transparent substrates lays respectively at the side in the face of this fluorescent tube.
6. according to the direct-light-type backlight module of the described application surface functions control of claim 3, it is characterized in that wherein the surface profile on this two transparent substrates lays respectively at the side back to this fluorescent tube.
7. according to the direct-light-type backlight module of the described application surface functions control of claim 1, it is characterized in that wherein this surface profile has the degree of depth of optical conversion unit of at least one part between 1-20 times of wavelength.
8. according to the direct-light-type backlight module of the described application surface functions control of claim 1, it is characterized in that wherein this surface profile is the relative tertiary location according to each element in this backlight source module, it is resultant to utilize a predefined function to calculate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100421755A CN100381904C (en) | 2004-05-10 | 2004-05-10 | Full run-down type backlight source module of using control of plane function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100421755A CN100381904C (en) | 2004-05-10 | 2004-05-10 | Full run-down type backlight source module of using control of plane function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1696785A CN1696785A (en) | 2005-11-16 |
| CN100381904C true CN100381904C (en) | 2008-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100421755A Expired - Fee Related CN100381904C (en) | 2004-05-10 | 2004-05-10 | Full run-down type backlight source module of using control of plane function |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100373229C (en) * | 2004-12-31 | 2008-03-05 | 财团法人工业技术研究院 | Backlight module with diffraction optical element |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04303802A (en) * | 1991-03-30 | 1992-10-27 | Sekisui Chem Co Ltd | Light diffusion sheet |
| JPH06102415A (en) * | 1992-09-24 | 1994-04-15 | Keiwa Shoko Kk | Condenser plate |
| US5467208A (en) * | 1992-06-01 | 1995-11-14 | Sharp Kabushiki Kaisha | Liquid crystal display |
| JPH09133812A (en) * | 1995-11-09 | 1997-05-20 | Nitto Denko Corp | Surface light source device |
| JP2002062528A (en) * | 2000-08-21 | 2002-02-28 | Keiwa Inc | Backlight unit |
| US6359735B1 (en) * | 1997-03-04 | 2002-03-19 | Fraunhofer Gesellschaft Zur Forderung Der Angewandten Forschung E.V. | Antireflective coating and method of manufacturing same |
| US20030133301A1 (en) * | 2002-01-15 | 2003-07-17 | Reflexite Corporation | Grooved optical microstructure light collimating films |
| CN1635408A (en) * | 2003-12-27 | 2005-07-06 | 鸿富锦精密工业（深圳）有限公司 | Direct type backlight module |
-
2004
- 2004-05-10 CN CNB2004100421755A patent/CN100381904C/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04303802A (en) * | 1991-03-30 | 1992-10-27 | Sekisui Chem Co Ltd | Light diffusion sheet |
| US5467208A (en) * | 1992-06-01 | 1995-11-14 | Sharp Kabushiki Kaisha | Liquid crystal display |
| JPH06102415A (en) * | 1992-09-24 | 1994-04-15 | Keiwa Shoko Kk | Condenser plate |
| JPH09133812A (en) * | 1995-11-09 | 1997-05-20 | Nitto Denko Corp | Surface light source device |
| US6359735B1 (en) * | 1997-03-04 | 2002-03-19 | Fraunhofer Gesellschaft Zur Forderung Der Angewandten Forschung E.V. | Antireflective coating and method of manufacturing same |
| JP2002062528A (en) * | 2000-08-21 | 2002-02-28 | Keiwa Inc | Backlight unit |
| US20030133301A1 (en) * | 2002-01-15 | 2003-07-17 | Reflexite Corporation | Grooved optical microstructure light collimating films |
| CN1635408A (en) * | 2003-12-27 | 2005-07-06 | 鸿富锦精密工业（深圳）有限公司 | Direct type backlight module |
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|---|---|
| CN1696785A (en) | 2005-11-16 |
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Granted publication date: 20080416 Termination date: 20100510 |