CN100405170C - Direct down type poor light module and its diffusion plate - Google Patents
Direct down type poor light module and its diffusion plate Download PDFInfo
- Publication number
- CN100405170C CN100405170C CNB031141285A CN03114128A CN100405170C CN 100405170 C CN100405170 C CN 100405170C CN B031141285 A CNB031141285 A CN B031141285A CN 03114128 A CN03114128 A CN 03114128A CN 100405170 C CN100405170 C CN 100405170C
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- diffuser plate
- backlight module
- fluorescent
- light source
- fluorescent material
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Abstract
The present invention relates to a directly downward type backlight module which comprises a light source and a diffusing plate, wherein the light source emits light beam of which the brightness is distributed in specific space; the diffusing plate scatters the light beam and comprises a light entering surface used for receiving light beams, and fluorescent substance of which the space distribution is corresponding to the space distribution of the brightness of the light beam of the light source. The present invention adopts the combination of the diffusing plate and the light source and has high light expelling brightness and uniformity.
Description
[technical field]
The present invention relates to a kind of direct type backlight module and diffuser plate thereof, refer to the direct type backlight module of the uniform diffuser plate of a kind of emitting brightness and this diffuser plate of employing especially.
[background technology]
Because advantages such as LCD has gently, approaches, power consumption is little are widely used in modernized information equipments such as notebook, mobile phone, personal digital assistant.Because liquid crystal itself does not have the characteristics of luminescence, need provide backlight module to realize Presentation Function for it.
As everyone knows, backlight module can be divided into side-light type and two kinds of designs of straight-down negative.Generally speaking, for the small-medium size LCD, side light type back light module has advantages such as light weight, slim, narrow frameization, low consumption electric power.Yet, along with science and technology is growing, demand to the large scale liquid crystal display is surging day by day, and the large scale side light type back light module is difficult as people's will in the performance of many aspects such as weight and consumption electric power, and the light utilization efficiency of side light type back light module is lower, its number of light sources of holding is also very limited, so can't reach the brightness requirement of large scale liquid crystal display.Therefore, the direct type backlight module that does not contain light guide plate is grown up.
A kind of prior art direct type backlight module can be consulted the United States Patent (USP) the 5th of bulletin on September 9th, 1997,664, No. 873 (Fig. 1 with reference to), this direct type backlight module 100 comprise that two fluorescent tubes 110, accommodate reflex housing 120, the one smooth curtain 130 (Light Curtain) and a diffuser plate 140 of this two fluorescent tube 110 of location.This diffuser plate 140 comprises incidence surface 141 and exiting surface 142, and wherein, these two fluorescent tubes, 110 relative these incidence surfaces 141 are provided with, and this light curtain 130 is arranged between this two fluorescent tube 110 and the diffuser plate 140, regulates the outgoing light homogeneity of direct type backlight module 100.During work, in these diffuser plate 140 internal transmission, and be converted to area source through exiting surface 142 outgoing from the light beam of fluorescent tube 110 and reflex housing 120.
Yet because the incidence surface 141 of these two fluorescent tubes, 110 relative diffusion plates 140 arranges in regular turn, and the brightness of the light of its emission has certain space distribution, makes the light of self-diffusion plate 140 outgoing be difficult to homogenising in the distribution of exiting surface 142.
Consult Fig. 2 in the lump, a district of the exiting surface 142 of the diffuser plate 140 of relative two fluorescent tubes, 110 profiles is than b district brightness height.That is, light curtain 130 can only partly improve the whole outgoing light homogeneity of direct type backlight module 100.In addition, the employing of this light curtain 130 makes the volume of direct type backlight module 100, weight increase, make the consuming time and human cost of assembling improve simultaneously, and then increase the cost of direct type backlight module 100, and can the absorption portion luminous energy and reduce the brightness of diffuser plate 140 emergent raies.
[summary of the invention]
The defective of, complex structure relatively poor, assembling inconvenience for the homogeneity that overcomes prior art direct type backlight module emitting brightness, the invention provides a kind of emitting brightness even, simple in structure, assemble direct type backlight module easily.
For overcoming the relatively poor defective of prior art diffuser plate emitting brightness homogeneity, the invention provides the uniform diffuser plate of a kind of emitting brightness.
The technical scheme of technical solution problem of the present invention is: a kind of direct type backlight module is provided, and it comprises a light source and a diffuser plate, and this light source sends the light beam that brightness is particular spatial distribution, this this light beam of diffuser plate scattering, and it comprises the incidence surface of receiving beam.This diffuser plate also contains fluorescent material, and the space distribution of this fluorescent material is corresponding to the space distribution of the brightness of light beam of light source, the concentration of the fluorescent material that the concentration of the fluorescent material that this diffuser plate contains corresponding to the zone of light source contains less than other zone of diffuser plate.
The present invention also provides a kind of diffuser plate, is applied to direct type backlight module and is the external beam of particular spatial distribution with scattering brightness, and it comprises the incidence surface that receives this external beam.This diffuser plate also contains fluorescent material, and the space distribution of this fluorescent material in diffuser plate be corresponding to the space distribution of the brightness of external beam, the concentration of the fluorescent material that the concentration of the fluorescent material that this diffuser plate contains corresponding to the zone of light source contains less than other zone of diffuser plate.
Compare prior art, the invention has the beneficial effects as follows: because diffuser plate of the present invention contains fluorescent material, this fluorescent material be subjected to external light source luminous bundle excitation and send direction-free light, and the space distribution of this fluorescent material is corresponding to the space distribution of the brightness of light beam of light source, the concentration of the fluorescent material that the concentration of the fluorescent material that this diffuser plate contains corresponding to the zone of light source contains less than other zone of diffuser plate, can effectively reduce because the brightness of light source luminescent has the uneven defective of bright dipping that certain space distributes and caused, thereby promote the optical property of diffuser plate.Direct type backlight module of the present invention adopts the combination of diffuser plate and light source, need not make with the light curtain promptly to have higher outgoing light homogeneity, and it is simple in structure, assembling is convenient, and the energy loss of light beam is little, the brightness height.
[description of drawings]
Fig. 1 is the cut-open view of prior art direct type backlight module.
Fig. 2 is the bright dipping design sketch of direct type backlight module shown in Figure 1.
Fig. 3 is the stereographic map of direct type backlight module first embodiment of the present invention.
Fig. 4 is the cut-open view of diffuser plate shown in Figure 3.
Fig. 5 is the synoptic diagram of another embodiment of diffuser plate of the present invention.
Fig. 6 is the synoptic diagram of the another embodiment of diffuser plate of the present invention.
Fig. 7 is the front elevation of the light source of the another embodiment of direct type backlight module of the present invention.
[embodiment]
Seeing also Fig. 3, is direct type backlight module first embodiment of the present invention, and this direct type backlight module comprises a reflection framework 210, is housed in a plurality of fluorescent tubes 220, a diffuser plate 230 and a blast sheet 240 in the reflection framework 210.This diffuser plate 230 comprises an incidence surface 231 and an exiting surface 232 relative with incidence surface 231, and the incidence surface 231 of these a plurality of fluorescent tube 220 relative these diffuser plates 230 is provided with, and this blast sheet 240 is positioned at exiting surface 232 1 sides.These reflection framework 210 surfaces are coated with reflectance coating 211, and in order to the light beam that sends of reflection fluorescent tube 220, and then the utilization factor that promotes light beam is to increase brightness.
See also Fig. 4, the function of this diffuser plate 230 is to produce abundant scattering when the light beam that fluorescent tube 220 is sent sees through its inside, thereby makes light uniformization, the diffusion layer 235 that it comprises base material 234 and is formed on base material 234 surfaces.This base material 234 adopts the higher material of light transmission rate, makes as PMMA (Polymethyl Methacrylate, polymethylmethacrylate) or PC (Polycarbonate, polycarbonate) etc., and it serves as the carrier of diffusion layer 235.This diffusion layer 235 is PC materials that inscription plate industry embossing is handled, and mixes fluorescent material (not indicating) in it simultaneously.This diffusion layer 235 comprises zone 237 and other zone 236 corresponding to fluorescent tube 220.
The diffusion layer 235 of this diffuser plate 230 adopts ejection formation, and is divided into zone 237 and other regional 236 two parts chargings corresponding to fluorescent tube 220.During charging, in injecting zone 236 leaded light plastics, add fluorescent material, and the material of injecting zone 237 is common leaded light plastics.This two sections of material is mixed in the mould moulding cave of (figure does not show) naturally subsequently.The space distribution of the brightness of the light beam that penetrates corresponding to fluorescent tube 220 in the distribution of diffusion layer 235 inside until fluorescent material, that is, the concentration that contains this fluorescent material corresponding to the zone 237 of fluorescent tube 220 contains the concentration of fluorescent material less than zone 236.
Certainly, this diffusion layer 235 adds the membraneous material of diffusant or the diffusion material of cloth of coating-type in also can being, this coating method can be the coating of mechanical system or coating or the coating of vacuum mode or the coating of spray pattern of volatilization mode, the fluorescent material that mixes and have above-mentioned space distribution when coating.
The fluorescent material that the present invention adopts can be fluorescein isothiocynate green glow fluorescent pigment, Nile blue A ruddiness fluorescent pigment or rhodamine toner B gold-tinted fluorescent pigment etc.
During work, the light beam that fluorescent tube 220 directly sends and transfer to diffuser plate 230 through reflectance coating 211 beam reflected, through diffuser plate 230 abundant scatterings, because the different fluorescent material of concentration is contained in two zones 236 and 237 of the diffusion layer 235 of this diffuser plate 230, this fluorescent material is subjected to the excitation of 220 luminous bundles of fluorescent tube and sends direction-free light, can effectively improve the contour image of brightness and elimination fluorescent tube 220, light beam evenly is incident to blast sheet 240, at last via blast sheet 240 optically focused and outgoing.
Seeing also Fig. 5, is the another embodiment of diffuser plate of the present invention.This diffuser plate 330 comprises base material 334 and diffusion layer 335, the compound diffusion material that this diffusion layer 335 adopts in conjunction with the bright enhancement film function.This base material 334 adopts general leaded light plastics ejection formation, and it contains fluorescent material (not indicating), and this fluorescent material has certain space distribution in base material 334.This base material 334 comprises corresponding to the zone 337 of fluorescent tube 220 (referring to Fig. 3) and other zone 336, and contains the concentration of fluorescent material less than zone 236 corresponding to the concentration that the zone 237 of fluorescent tube 220 contains this fluorescent material.
Seeing also Fig. 6, is the another embodiment of diffuser plate of the present invention.This diffuser plate 434 adopts general leaded light plastics ejection formation, and it contains fluorescent material (not indicating), and this fluorescent material has certain space distribution in diffuser plate 434.This diffuser plate 434 comprises corresponding to the zone 437 of fluorescent tube 220 (referring to Fig. 3) and other zone 436, and contains the concentration of fluorescent material less than zone 436 corresponding to the concentration that the zone 437 of fluorescent tube 220 contains this fluorescent material.The surface of this diffuser plate 434 processes to obtain the scattering power to light beam.
See also Fig. 7, it is the light source that the another embodiment of direct type backlight module of the present invention adopts, this light source comprises that a reflection framework 510 and is housed in the W shape fluorescent tube 520 of this reflection framework 510, and these reflection framework 510 surfaces are coated with the segment beam that reflectance coating 511 sends with reflection fluorescent tube 520.The both ends of this W shape fluorescent tube 520 are provided with an electrode 521 respectively.At this moment, the brightness of the light beam that light source sends has specific space distribution, and the higher zone of its brightness ratio is W shape, and correspondingly, corresponding fluorescent tube 520 of diffuser plate (figure does not show) and the less zone of fluorescent material concentration are W shape.
Certainly, direct type backlight module of the present invention has more than the description that is limited to above-mentioned embodiment, can be pointolites such as light emitting diode as this light source, and the exiting surface of this diffuser plate also can plate brightness enhancement film to replace this blast sheet.
Claims (10)
1. direct type backlight module, comprise the light source that sends the light beam that brightness is particular spatial distribution and the diffuser plate of this light beam of scattering, this diffuser plate comprises the incidence surface of a receiving beam, it is characterized in that: this diffuser plate further contains fluorescent material, the space distribution of this fluorescent material in diffuser plate corresponding to light source the space distribution of luminous beam brightness, the concentration of the fluorescent material that the concentration of the fluorescent material that this diffuser plate contains corresponding to the zone of light source contains less than other zone of diffuser plate.
2. backlight module as claimed in claim 1 is characterized in that: this diffuser plate also comprises base material and is formed on the diffusion layer of substrate surface that this fluorescent material is positioned at diffusion layer.
3. backlight module as claimed in claim 2 is characterized in that: the material of this diffusion layer adds the membraneous material of diffusant or the diffusion material or the PC of cloth of coating-type in being.
4. backlight module as claimed in claim 1 is characterized in that: this diffuser plate also comprises base material and is formed on the diffusion layer of substrate surface that this fluorescent material is positioned at base material.
5. backlight module as claimed in claim 4 is characterized in that: the material of this base material is PMMA or PC.
6. as each described backlight module of claim 1 to 5, it is characterized in that: this fluorescent material is fluorescein isothiocynate green glow fluorescent pigment, Nile blue A ruddiness fluorescent pigment or rhodamine toner B gold-tinted fluorescent pigment.
7. backlight module as claimed in claim 1 is characterized in that: this light source comprises that further a plurality of fluorescent tubes and hold the reflection framework of this fluorescent tube.
8. backlight module as claimed in claim 1 is characterized in that: this light source comprises that further a W shape fluorescent tube and holds the reflection framework of this fluorescent tube.
9. backlight module as claimed in claim 1 is characterized in that: this light source further comprises a plurality of light emitting diodes.
10. diffuser plate, be applied to direct type backlight module is particular spatial distribution with scattering brightness external beam, it comprises that one receives the incidence surface of external beam, it is characterized in that: this diffuser plate further contains fluorescent material, the space distribution of this fluorescent material in diffuser plate corresponding to light source the space distribution of luminous beam brightness, the concentration of the fluorescent material that the concentration of the fluorescent material that this diffuser plate contains corresponding to the zone of light source contains less than other zone of diffuser plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031141285A CN100405170C (en) | 2003-04-01 | 2003-04-01 | Direct down type poor light module and its diffusion plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031141285A CN100405170C (en) | 2003-04-01 | 2003-04-01 | Direct down type poor light module and its diffusion plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1534348A CN1534348A (en) | 2004-10-06 |
| CN100405170C true CN100405170C (en) | 2008-07-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031141285A Expired - Fee Related CN100405170C (en) | 2003-04-01 | 2003-04-01 | Direct down type poor light module and its diffusion plate |
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| CN (1) | CN100405170C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101118291B (en) * | 2006-08-04 | 2010-04-14 | 鸿富锦精密工业（深圳）有限公司 | Pervasion piece |
| JP5809493B2 (en) * | 2011-09-09 | 2015-11-11 | 東芝ライテック株式会社 | Lighting device |
| TWI497167B (en) * | 2012-09-24 | 2015-08-21 | Au Optronics Corp | Direct-type backlight module and diffuser structure |
| TWI477831B (en) * | 2013-05-23 | 2015-03-21 | Au Optronics Corp | Backlight module |
| CN104931237B (en) * | 2015-05-15 | 2017-12-29 | 广东省标准化研究院 | A kind of light box for illuminating effect observation |
| JP6691449B2 (en) * | 2016-07-11 | 2020-04-28 | 富士フイルム株式会社 | Area lighting device |
| CN108957606B (en) * | 2018-07-05 | 2021-03-30 | 深圳创维－Rgb电子有限公司 | Design method of composite diaphragm and composite diaphragm |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06273762A (en) * | 1993-03-19 | 1994-09-30 | Tanaka Kikinzoku Kogyo Kk | Light diffusion sheet for back light and its production |
| JPH07288023A (en) * | 1994-02-23 | 1995-10-31 | Sony Corp | Back light unit |
| JPH08146231A (en) * | 1994-11-21 | 1996-06-07 | Casio Comput Co Ltd | Backlight device |
| JPH11242219A (en) * | 1998-02-26 | 1999-09-07 | Toshiba Lighting & Technology Corp | Direct backlight device and liquid crystal display device |
| JP3150337B2 (en) * | 1990-11-29 | 2001-03-26 | セイコーエプソン株式会社 | Light source device and liquid crystal device |
-
2003
- 2003-04-01 CN CNB031141285A patent/CN100405170C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3150337B2 (en) * | 1990-11-29 | 2001-03-26 | セイコーエプソン株式会社 | Light source device and liquid crystal device |
| JPH06273762A (en) * | 1993-03-19 | 1994-09-30 | Tanaka Kikinzoku Kogyo Kk | Light diffusion sheet for back light and its production |
| JPH07288023A (en) * | 1994-02-23 | 1995-10-31 | Sony Corp | Back light unit |
| JPH08146231A (en) * | 1994-11-21 | 1996-06-07 | Casio Comput Co Ltd | Backlight device |
| JPH11242219A (en) * | 1998-02-26 | 1999-09-07 | Toshiba Lighting & Technology Corp | Direct backlight device and liquid crystal display device |
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| Publication number | Publication date |
|---|---|
| CN1534348A (en) | 2004-10-06 |
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Granted publication date: 20080723 Termination date: 20170401 |